CN101925241A - Pulse startup circuit - Google Patents
Pulse startup circuit Download PDFInfo
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- CN101925241A CN101925241A CN201010179345XA CN201010179345A CN101925241A CN 101925241 A CN101925241 A CN 101925241A CN 201010179345X A CN201010179345X A CN 201010179345XA CN 201010179345 A CN201010179345 A CN 201010179345A CN 101925241 A CN101925241 A CN 101925241A
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- 239000003990 capacitor Substances 0.000 claims abstract description 41
- 238000004804 winding Methods 0.000 claims abstract description 35
- 230000008878 coupling Effects 0.000 claims description 20
- 238000010168 coupling process Methods 0.000 claims description 20
- 238000005859 coupling reaction Methods 0.000 claims description 20
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 6
- 229910052710 silicon Inorganic materials 0.000 abstract 6
- 239000010703 silicon Substances 0.000 abstract 6
- 238000010586 diagram Methods 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000007600 charging Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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Abstract
The invention provides a pulse startup circuit, which comprises a positive input voltage connection point, a negative input voltage connection point, a transformer, a unidirectional silicon controlled switch element, a first capacitor, a first impedance component and a module, wherein the positive input voltage connection point and the negative input voltage connection point are respectively used for correspondingly connecting a positive output voltage connection point and a negative output voltage connection point of a DC voltage bus; the transformer comprises a primary winding and a secondary winding; the unidirectional silicon controlled switch element is connected in series with the primary winding of the transformer; the first capacitor is connected in parallel with the primary winding and the unidirectional silicon controlled switch element which are connected in series; the first impedance component is coupled between a junction of the primary winding and the first capacitor and the positive input voltage connection point; and the module can form reversed bias voltage between a negative electrode and a control electrode of the unidirectional silicon controlled switch element when the unidirectional silicon controlled switch element needs turn-off, and is coupled between a junction of the first capacitor and the unidirectional silicon controlled switch element and the negative input voltage connection point.
Description
Technical field
The present invention relates to a kind of pulse starting circuit, relate in particular to a kind of pulse-triggered voltage that provides to be used to start gaseous discharge lamp, as high-intensity discharge (HID) lamp, pulse starting circuit.The invention still further relates to a kind of ballast that comprises this pulse starting circuit that can be used for gaseous discharge lamp.
Background technology
Be the characteristic of cooperation HID lamp, normally a kind of low-frequency electronic ballast of HID lamp electronic ballast, its output frequency is arranged in the scope of 100Hz-400Hz mostly.In addition, after the HID lamp enters steady operation, be the temperature difference of two electrodes avoiding the HID lamp, require to drive with alternating current.Therefore, the HID lamp uses electric ballast that AC line voltage transitions is become low frequency bi usually.Usually, the HID lamp electronic ballast comprises the inverter that is used for that AC line voltage transitions become the preconditioner of dc voltage and dc voltage is converted to low frequency bi.Inverter can take the to connect form of half-bridge or full-bridge is connected to the dc voltage bus.
On the other hand, " trigger voltage of (ambient temperature) is generally 3-5kV to the HID lamp in " cold conditions ".When the HID lamp exists " it is hot that " when restarting under (be that lamp is in operation and extinguishes, the temperature of lamp does not reduce or reduce few situation as yet), the required voltage amplitude often reaches 25kV even 30kV.Under such voltage, lamp will puncture within 10ns and light.Therefore, the HID lamp electronic ballast need design special start-up circuit (or be called " flip-flop circuit "), for the startup of lamp provides sufficiently high trigger voltage.
A kind of start-up circuit of lighting the HID lamp is a circuit as shown in Figure 1.After DC input voitage Vin was saturated by 1 pair of capacitor C1 charging of resistor R, the control utmost point of one-way SCR switch element Q1 was accepted triggering signal Sgate and is made one-way SCR switch element Q1 triggering and conducting, and then capacitor C1 begins discharge.The discharging current of capacitor C1 discharge generation flows through the elementary winding of transformer T1 and produces very high pulse voltage Vout to light the HID lamp at the secondary winding of transformer T1.But the shortcoming of this circuit is one-way SCR switch element Q1 sometimes can not normal turn-off, and then produces higher energy loss on resistance R 1, sometimes even cause resistance R 1 to be burnt.For example, when one-way SCR switch element Q1 was in higher junction temperature, it is often lower that it keeps electric current, may cause the one-way SCR switch element Q1 can not normal turn-off; Perhaps, when the voltage before the charging unsaturation of capacitor C1 on it is also low, the one-way SCR switch element Q1 conducting that just is triggered, one-way SCR switch element Q1 also is difficult to normal turn-off.
Summary of the invention
The present invention proposes a kind of pulse starting circuit and a kind of ballast that comprises this pulse starting circuit that can be used for gaseous discharge lamp, this pulse starting circuit has reliable turn-off performance.
According to one embodiment of present invention, this pulse starting circuit comprises: positive tie point of input voltage and input voltage are born tie point, are respectively applied for that negative tie point is corresponding links to each other with the positive tie point of the output voltage of a dc voltage bus and output voltage; The transformer that comprises elementary winding and secondary winding, two end points of described secondary winding constitute the output voltage tie point of described pulse starting circuit; With the one-way SCR switch element that the elementary windings in series of described transformer is connected, the anode of described one-way SCR switch element is corresponding continuous with an end points of the elementary winding of described transformer; First capacitor that is connected in parallel with described elementary winding that is connected in series and described one-way SCR switch element; Be coupling in the node of described elementary winding and described first capacitor and first impedance component between the positive tie point of described input voltage; Can be at the negative electrode and the module of controlling interpolar formation reversed bias voltage of described one-way SCR switch element when described one-way SCR switch element need turn-off, described module is coupling between the node and the negative tie point of described input voltage of described first capacitor and described one-way SCR switch element.
According to another embodiment of the invention, provide a kind of ballast that is used for gaseous discharge lamp, comprised dc voltage bus, inverter circuit and aforesaid pulse starting circuit with the positive tie point of output voltage and the negative tie point of output voltage.Wherein, inverter circuit be coupling in be used to generate half period alternately between the positive tie point of described dc voltage bus and negative tie point bi-directional voltage to offer described gaseous discharge lamp, described pulse starting circuit is coupling between the positive tie point and negative tie point of described dc voltage bus.
Pulse starting circuit of the present invention, owing to have the module that can be when described one-way SCR switch element need turn-off forms reversed bias voltage at the negative electrode and the control interpolar of described one-way SCR switch element, make this one-way SCR switch element to turn-off because of this reversed bias voltage reliably and so pulse starting circuit is in time turn-offed.
Description of drawings
By reading below in conjunction with the description of accompanying drawing to indefiniteness embodiment, other purpose of the present invention, feature and advantage will become more obvious and outstanding.
Fig. 1 is the electrical block diagram of a kind of start-up circuit of the prior art;
The electrical block diagram of the pulse starting circuit that provides according to one embodiment of the invention is provided Fig. 2;
The electrical block diagram of the pulse starting circuit that provides according to another embodiment of the present invention is provided Fig. 3;
The electrical block diagram of the ballast that is used for gaseous discharge lamp that provides according to yet another embodiment of the invention is provided Fig. 4.
Wherein, same or analogous Reference numeral is represented same or analogous steps characteristic/device (module).
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described.
The electrical block diagram of the pulse starting circuit 10 that provides according to one embodiment of the invention is provided Fig. 2.This pulse starting circuit 10 comprises the positive tie point A of input voltage, the negative tie point B of input voltage, transformer 11, one-way SCR switch element 12, first capacitor 13, first impedance component 14 and can (be " reversed bias voltage module 15 " ") hereinafter to be referred as this module 15 at the negative electrode of one-way SCR switch element 12 and the module 15 of control interpolar formation reversed bias voltage when one-way SCR switch element 12 needs to turn-off.
The negative tie point B of the positive tie point A of input voltage and input voltage is respectively applied for that negative tie point is corresponding links to each other with the positive tie point of the output voltage of a dc voltage bus 30 and output voltage, thereby pulse starting circuit 10 is from this dc voltage bus 30 acquisition DC input voitage Vin.Transformer 11 comprises elementary winding W1 and secondary winding W2, and two end points of secondary winding W2 constitute the tie point of the output voltage V out of pulse starting circuit 10.One-way SCR switch element 12 is connected in series with the elementary winding W1 of transformer 11, and the anode of this one-way SCR switch element 12 is corresponding continuous with the end points of elementary winding W1.First capacitor 13 is connected in parallel with the elementary winding W1 and the one-way SCR switch element 12 that are connected in series.First impedance component 14 is coupling between the node and the positive tie point A of input voltage of the elementary winding W1 and first capacitor 13.Selectively, first impedance component 14 comprises a resistor.Certainly, first impedance component 14 also can comprise other elements, but it mainly shows as impedance operator on the whole.Reversed bias voltage module 15 is coupling between the node and the negative tie point B of input voltage of first capacitor 13 and one-way SCR switch element 12.
Reversed bias voltage module 15 comprises second impedance component 151 and the 3rd impedance component 152 in the embodiment shown in Figure 2.Second impedance component 151 is coupling between the node and the negative tie point B of input voltage of first capacitor 13 and one-way SCR switch element 12.The 3rd impedance component 152 is coupling between the control utmost point and the negative tie point B of input voltage of one-way SCR switch element 12.Selectively, second impedance component 151 comprises a resistor, and the 3rd impedance component 152 also comprises a resistor.With first impedance component 14 similarly, second impedance component 151 and the 3rd impedance component 152 yet can comprise other elements respectively, but it mainly shows as impedance operator on the whole.The 3rd impedance component 152 can be the impedance component between the control utmost point that is added to one-way SCR switch element 12 and the negative tie point B of input voltage.Under the negative directly grounded situation of tie point B of input voltage, the 3rd impedance component 152 also can be the impedance component that the drive circuit (not shown) of the control utmost point of one-way SCR switch element 12 is had.Selectively, the resistance of second impedance component 151 and the 3rd impedance component 152 is suitable.
Selectively, reversed bias voltage module 15 also comprises second capacitor 153 that is connected in parallel with second impedance component 151.Second capacitor 153 mainly plays a part to reduce the interference noise on second impedance component 151 and then prevent that reverse-blocking tetrode thyristor element 12 from misleading.Because second impedance component 151 links to each other with the negative electrode of one-way SCR switch element 12, if enough it also can make 12 conductings of one-way SCR switch element and then make pulse starting circuit 10 produce pulse output voltages the interference noise on second impedance component 151 greatly.Therefore, by reducing the interference noise on second impedance component 151, second capacitor 153 can prevent misleading of reverse-blocking tetrode thyristor element 12.
Selectively, reversed bias voltage module 15 also comprises the 3rd capacitor 154 that is connected in parallel with the 3rd impedance component 152.The effect of the 3rd capacitor 154 is similar to second capacitor 153, does not repeat them here.
Selectively, the puncture voltage of one-way SCR switch element 12 is about 2 times of sizes of DC input voitage Vin.For example, if DC input voitage Vin is 400V, then puncture voltage can be chosen in about 800～1000V.
Selectively, the resistance of resistance value ratio first impedance component 14 of second impedance component 151 is little a lot.For example, 15% of the resistance of resistance value ratio first impedance component 14 of second impedance component 151 is also little.Preferably, the resistance of second impedance component 151 be first impedance component 14 resistance 1% to 10% between.Because the resistance of resistance value ratio first impedance component 14 of second impedance component 151 is little a lot, therefore will be about the very small scale of the DC input voitage Vin that the dc voltage bus provides in the pressure drop of second impedance component 151, as 10% less than.Like this, can avoid forming very high reversed bias voltage and surpassing the limit that one-way SCR switch element 12 can bear at the negative electrode of one-way SCR switch element 12.
The operation principle of pulse starting circuit 10 below will be described.When dc voltage bus 30 provides DC input voitage Vin to pulse starting circuit 10, by first impedance component 14 and 13 chargings of 151 pairs first capacitors of second impedance component, the 12 not conductings of one-way SCR switch element apply a triggering signal Sgate up to the control utmost point at one-way SCR switch element 12 at incipient stage DC input voitage Vin.After the charging of first capacitor 13 is saturated, applies triggering signal Sgate at the control utmost point of one-way SCR switch element 12 and make its triggering and conducting.After 12 conductings of one-way SCR switch element, the elementary winding W1 of first impedance component 14, transformer 11, one-way SCR switch element 12 and second impedance component 151 form loops with dc voltage bus 30, and the elementary winding W1 of first capacitor 13 by transformer 11 begins to discharge and make the elementary winding W1 of transformer 11 that very high discharging current be arranged simultaneously.The conducting of one-way SCR switch element 12 makes the elementary winding W1 of transformer 11 have electric current (based on discharging current) to flow through, and transformer 11 is a step-up transformer, thereby produces very high pulse output voltage Vout at the two ends of the secondary winding W2 of transformer 11.Voltage on first capacitor 13 is dropped rapidly to zero and becomes negative voltage.Negative voltage on first capacitor 13 is because the energy on the transformer 11 impels discharging current that reverse charge on first capacitor 13 is formed.When the discharging current of first capacitor 13 reduced to zero, it is maximum that the reverse voltage on first capacitor 13 reaches.The turn-off time of one-way SCR switch element 12, can continue above 200 μ s and the reverse voltage of first capacitor 13 is general between 100 μ s about 20 μ s.Usually, one-way SCR switch element 12 will be turned off under the effect at this reverse voltage when this discharging current reduces to zero.
But under foregoing some special case, if one-way SCR switch element 12 can not be by normal turn-off under the effect of this reverse voltage, still have electric current (being mainly the electric current that DC input voitage Vin produces) to flow through on the one-way SCR switch element 12, then this electric current also can pass through the elementary winding W1 and second impedance component 151 of first impedance component 14, transformer 11 simultaneously.The electric current that flows through second impedance component 151 will produce a voltage drop on second impedance component 151.Because the control utmost point and the negative electrode of second impedance component 151, the 3rd impedance component 152, one-way SCR switch element 12 form a loop, therefore this voltage drop that produces on second impedance component 151 forms a reversed bias voltage at the control utmost point and the negative electrode of one-way SCR switch element 12 again.This reversed bias voltage will make the electric current of keeping of one-way SCR switch element 12 bring up to a new rank, even therefore one-way SCR switch element 12 still has higher anode current, it also can be turned off under the effect of this reversed bias voltage.
The electrical block diagram of the pulse starting circuit 10 that provides according to another embodiment of the present invention is provided Fig. 3.Reversed bias voltage module 15 comprises second impedance component 151, second capacitor 153, first switch element 155 and first control element 156 in the embodiment shown in fig. 3.Second impedance component 151 and second capacitor 153 are connected in parallel and are coupling between the node and the negative tie point B of input voltage of first capacitor 13 and one-way SCR switch element 12.First switch element 155 is coupling between the control utmost point and the negative tie point B of input voltage of one-way SCR switch element 12.First control element 156 is provided in and controls 155 conductings of first switch element when one-way SCR switch element 12 needs to turn-off.
Other elements of pulse starting circuit 10 shown in Figure 3 are identical with pulse starting circuit 10 shown in Figure 2, see also preamble.
When one-way SCR switch element 12 needs to turn-off, because the conducting of first switch element 155 makes the control utmost point ground connection of one-way SCR switch element 12.As described in the previous embodiment, be formed with voltage drop on second impedance component 151, so this voltage drop forms a reversed bias voltage at the control utmost point and the negative electrode of one-way SCR switch element 12.One-way SCR switch element 12 is turned off under the effect of this reversed bias voltage.
The electrical block diagram of the ballast that is used for gaseous discharge lamp 40 100 that provides according to yet another embodiment of the invention is provided Fig. 4.This ballast 100 comprises dc voltage bus 30, inverter circuit 20 and the foregoing pulse starting circuit provided by the invention 10 with the positive tie point of output voltage and the negative tie point of output voltage.Inverter circuit 20 be coupling in be used to generate half period alternately between the positive tie point of dc voltage bus 30 and negative tie point bi-directional voltage to offer gaseous discharge lamp 40.Pulse starting circuit 10 is coupling between the positive tie point of dc voltage bus 30 and negative tie point thinks that the startup of gaseous discharge lamp 40 provides sufficiently high trigger voltage.
In embodiment as shown in Figure 4, pulse starting circuit 10 adopts the structure of embodiment as shown in Figure 2.Inverter circuit 20 is a full-bridge inverter circuit, comprises the first transistor 21, transistor seconds 22, the 3rd transistor 23, the 4th transistor 24 and transistor controls unit 25.Be connected to the first output C of pulse starting circuit 10 after the drain electrode of the source electrode of the first transistor 21 and transistor seconds 22 links to each other, behind the second output D of the secondary winding W2 of transformer 11 and pulse starting circuit 10, be connected to gaseous discharge lamp 40.After linking to each other, the drain electrode of the source electrode of the 3rd transistor 23 and the 4th transistor 24 is connected to gaseous discharge lamp 40.These transistors and transistor controls unit 25 each other and and the connected mode of 30 of dc voltage buses, transistor controls unit 25 to these transistorized control, known for those skilled in the art, repeat no more.
In other embodiments, inverter circuit 20 also is chosen as the half-bridge inverter circuit.
More than the specific embodiment of the present invention is described.Need to prove that the present invention is not limited to above-mentioned specific implementations, those skilled in the art can make various modification or modification within the scope of the appended claims.
Claims (10)
1. a pulse starting circuit (10) comprising:
Positive tie point of input voltage (A) and input voltage are born tie point (B), are respectively applied for that negative tie point is corresponding links to each other with the positive tie point of output voltage of a dc voltage bus (30) and output voltage;
The transformer (11) that comprises elementary winding (W1) and secondary winding (W2), (C D) constitutes the output voltage tie point of described pulse starting circuit (10) to two end points of described secondary winding (W1);
With the one-way SCR switch element (12) that the elementary winding (W1) of described transformer (11) is connected in series, corresponding the linking to each other of an end points of the anode of described one-way SCR switch element (12) and the elementary winding (W1) of described transformer;
First capacitor (13) that is connected in parallel with described elementary winding (W1) that is connected in series and described one-way SCR switch element (12);
Be coupling in the node of described elementary winding (W1) and described first capacitor (13) and first impedance component (14) between the positive tie point of described input voltage (A);
It is characterized in that, described pulse starting circuit (10) also comprises can be at the negative electrode and the module (15) of controlling interpolar formation reversed bias voltage of described one-way SCR switch element (12) when described one-way SCR switch element (12) needs to turn-off, and described module (15) is coupling between the node and the negative tie point (B) of described input voltage of described first capacitor (13) and described one-way SCR switch element (12).
2. pulse starting circuit according to claim 1 (10) is characterized in that, described module (15) comprising:
Second impedance component (151), described second impedance component (151) are coupling between the node and the negative tie point (B) of described input voltage of described first capacitor (13) and described one-way SCR switch element (12);
The 3rd impedance component (152), described the 3rd impedance component (152) are coupling between the control utmost point and the negative tie point (B) of described input voltage of described one-way SCR switch element (12).
3. pulse starting circuit according to claim 1 (10) is characterized in that, described module (15) comprising:
Second impedance component (151), described second impedance component (151) are coupling between the node and the negative tie point (B) of described input voltage of described first capacitor (13) and described one-way SCR switch element (12);
First switch element (155), described first switch element (155) are coupling between the control utmost point and the negative tie point (B) of described input voltage of described one-way SCR switch element (12);
First control element (156), described first control element (156) are provided in and control described first switch element (155) conducting when described one-way SCR switch element (12) needs to turn-off.
4. according to claim 2 or 3 described pulse starting circuits (10), it is characterized in that the resistance of described first impedance component of the resistance value ratio of described second impedance component (151) (14) 15% also little.
5. according to claim 2 or 3 described pulse starting circuits (10), it is characterized in that described module (15) also comprises second capacitor (153) that is connected in parallel with described second impedance component (151).
6. pulse starting circuit according to claim 2 (10) is characterized in that, described module (15) also comprises the 3rd capacitor (154) that is connected in parallel with described the 3rd impedance component (152).
7. pulse starting circuit according to claim 1 (10) is characterized in that, described first impedance component (14) comprises a resistor.
8. according to claim 2 or 3 described pulse starting circuits (10), it is characterized in that described second impedance component (151) comprises a resistor.
9. pulse starting circuit according to claim 2 (10) is characterized in that, described the 3rd impedance component (152) comprises a resistor.
10. ballast (100) that is used for gaseous discharge lamp (40) comprising:
Dc voltage bus (30) with the negative tie point of positive tie point of output voltage and output voltage;
Inverter circuit (20), be coupling in be used to generate half period alternately between the positive tie point of described dc voltage bus (30) and negative tie point bi-directional voltage to offer described gaseous discharge lamp (40);
As the described pulse starting circuit of one of claim 1-9 (10), described pulse starting circuit (10) is coupling between the positive tie point and negative tie point of described dc voltage bus (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010179345XA CN101925241A (en) | 2009-06-09 | 2010-05-20 | Pulse startup circuit |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910203398 | 2009-06-09 | ||
| CN200910203398.8 | 2009-06-09 | ||
| CN201010179345XA CN101925241A (en) | 2009-06-09 | 2010-05-20 | Pulse startup circuit |
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| Publication Number | Publication Date |
|---|---|
| CN101925241A true CN101925241A (en) | 2010-12-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010179345XA Pending CN101925241A (en) | 2009-06-09 | 2010-05-20 | Pulse startup circuit |
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| CN (1) | CN101925241A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87207032U (en) * | 1987-05-09 | 1988-03-09 | 王春琛 | Electronic trigger for dysprosium lamp |
| CN1173106A (en) * | 1996-06-24 | 1998-02-11 | 通用电气公司 | Diodeless start circuit for gas discharge lamp |
| CN2308222Y (en) * | 1997-07-18 | 1999-02-17 | 赵平 | Capacity fluorescent lamp ballast |
| JP2001068277A (en) * | 1999-08-26 | 2001-03-16 | Matsushita Electric Works Ltd | Electric power source device |
| US20090160351A1 (en) * | 2007-12-21 | 2009-06-25 | Chuan Shih Industrial Co., Ltd | Electric discharge light-regulation matching circuit |
-
2010
- 2010-05-20 CN CN201010179345XA patent/CN101925241A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87207032U (en) * | 1987-05-09 | 1988-03-09 | 王春琛 | Electronic trigger for dysprosium lamp |
| CN1173106A (en) * | 1996-06-24 | 1998-02-11 | 通用电气公司 | Diodeless start circuit for gas discharge lamp |
| CN2308222Y (en) * | 1997-07-18 | 1999-02-17 | 赵平 | Capacity fluorescent lamp ballast |
| JP2001068277A (en) * | 1999-08-26 | 2001-03-16 | Matsushita Electric Works Ltd | Electric power source device |
| US20090160351A1 (en) * | 2007-12-21 | 2009-06-25 | Chuan Shih Industrial Co., Ltd | Electric discharge light-regulation matching circuit |
Non-Patent Citations (1)
| Title |
|---|
| 路秋生: "《常用电子镇流器电路及应用》", 31 May 2006, article "常用高强度放电灯电子镇流器电路与应用", pages: 81-124 * |
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Application publication date: 20101222 |