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WO2018145381A1 - Dispositif de protection de circuit et système d'alimentation électrique - Google Patents

Dispositif de protection de circuit et système d'alimentation électrique Download PDF

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Publication number
WO2018145381A1
WO2018145381A1 PCT/CN2017/088118 CN2017088118W WO2018145381A1 WO 2018145381 A1 WO2018145381 A1 WO 2018145381A1 CN 2017088118 W CN2017088118 W CN 2017088118W WO 2018145381 A1 WO2018145381 A1 WO 2018145381A1
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WO
WIPO (PCT)
Prior art keywords
diode
resistor
protection device
filter
induction
Prior art date
Application number
PCT/CN2017/088118
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English (en)
Chinese (zh)
Inventor
马健
马骥
Original Assignee
中领世能 (天津) 科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中领世能 (天津) 科技有限公司 filed Critical 中领世能 (天津) 科技有限公司
Publication of WO2018145381A1 publication Critical patent/WO2018145381A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for DC applications

Definitions

  • the present invention relates to the field of secure power supply technologies, and in particular, to a circuit protection device and a power supply system.
  • short-circuit and overload are two important reasons that affect safe power supply.
  • the short-circuit and overload prevention measures are usually used to monitor the current of the mains output line by means of fuses or relays. When the current of the output line is too large, the power supply of the output line is cut off by the fuse blown or the relay is disconnected to protect the line and the electrical equipment.
  • the existing protection methods are less sensitive and cannot effectively protect the line in the event of a short circuit or overload.
  • an object of the present invention is to provide a circuit protection device and a power supply system capable of effectively protecting a power transmission line in the event of a short circuit or an overload, thereby improving the safety of the power transmission line.
  • an embodiment of the present invention provides a circuit protection device including an induction coil, a rectifier circuit, and an induction chip;
  • the induction coil is used for mutual inductance connection with a primary coil of a transformer, and generates an alternating current sensing signal
  • the rectifier circuit is connected between the induction coil and the sensing chip, and the rectifier circuit
  • the AC induction signal is rectified into a DC induction signal
  • the sensing chip receives the DC induction signal, and when the DC sensing signal exceeds a preset value, the sensing chip outputs a power-off signal.
  • an embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein the rectifier circuit is a rectifier bridge.
  • the rectifier bridge includes: a first diode, a second diode, a third diode, and a fourth diode, and a cathode of the first diode and the second An anode of the pole tube is connected, a second diode cathode is connected to a cathode of the fourth diode, and a cathode of the fourth diode is connected to a cathode of the third diode, The anode of the three diode is connected to the anode of the first diode.
  • One end of the induction coil is connected between the first diode and the second diode, and the other end of the induction coil is connected to the first diode and the second diode Between to form a rectifier bridge.
  • an embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein the circuit protection device further includes a filter circuit and an amplifying circuit connected between the rectifier circuit and the sensing chip. .
  • the filter circuit includes: a first filter capacitor, a second filter capacitor, and a filter resistor, wherein one end of the first filter capacitor is connected to the second diode and the fourth diode The other end of the first filter capacitor is connected between the first diode and the third diode, and the filter resistor is connected in series with the second filter capacitor and then connected in parallel at the first The two ends of the filter capacitor filter the DC induction signal through the first filter capacitor, the second filter capacitor, and the filter resistor.
  • the amplifying circuit includes: a first variable resistor, a PNP type transistor, a first resistor, a second resistor, and a Zener diode, and one end of the first resistor is connected to the second filter capacitor and the Between the filter resistors, the other end of the first resistor is connected between the first diode and the third diode via a Zener diode and a first variable resistor.
  • the base set of the PNP type transistor is connected to the first variable resistor, the emitter of the PNP type transistor is connected between the second filter capacitor and the filter resistor, and the collector of the PNP type transistor is connected via the second resistor Between the second filter capacitor and the filter resistor.
  • the amplifying circuit further includes a second variable resistor, the second variable resistor is connected in parallel with the second filter capacitor, and the first input end of the input sensing chip and the set of PNP type transistors An electrode is connected, and a second input end of the input sensing chip is connected between the second variable resistor and the filter resistor.
  • the first variable resistor and the second variable resistor have adjustable resistance values ranging from 0 to 5.1K ⁇ .
  • the positive power terminal of the sensing chip is connected between the first diode and the third diode, and the negative power terminal of the sensing chip is connected to the second filter capacitor and the filter resistor between.
  • the embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the sensing chip includes a comparing unit and a triggering unit;
  • the comparing unit receives the DC sensing signal, and compares the DC sensing signal with the preset value
  • the trigger unit When the DC sensing signal exceeds a preset value, the trigger unit outputs a power down signal.
  • the embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein the trigger unit is provided with a multi-stable trigger;
  • the multi-stable trigger outputs a power down signal when the DC sense signal exceeds a preset value.
  • an embodiment of the present invention further provides a power supply system including a transformer and the circuit protection device described above;
  • the primary coil of the transformer has an inductive winding connected in series,
  • the induction coil in the circuit protection device is connected to the induction winding in a mutual inductance.
  • the embodiment of the present invention provides a first possible implementation manner of the second aspect, wherein the power supply system further includes a first relay;
  • An output end of the sensing chip is connected to a control end of the first relay.
  • the embodiment of the present invention provides a second possible implementation manner of the second aspect, wherein the first output end of the sensing chip is connected to the control coil of the first relay through a thyristor;
  • the second output end of the sensing chip is connected to the control end of the thyristor through a bidirectional diode.
  • the embodiment of the present invention provides a third possible implementation manner of the second aspect, wherein the power supply system further includes a second relay;
  • An output of the first relay is connected in series with a control coil of the second relay, and an output of the second relay is connected in series with the primary coil.
  • an embodiment of the present invention provides a fourth possible implementation manner of the second aspect, wherein the first relay is a normally closed relay, and the second relay is a normally open relay.
  • the circuit protection device includes an induction coil, a rectifier circuit and an induction chip.
  • the induction coil is used for mutual inductance connection with the primary coil of the transformer, and generates an alternating current induction signal through mutual inductance with the circuit of the primary coil of the transformer.
  • the rectifier circuit is connected between the induction coil and the sensing chip, and is used for rectifying the AC induction signal into a DC induction signal.
  • the sensing chip receives the DC sensing signal. When the DC sensing signal exceeds the preset value, the sensing chip outputs a power-off signal and disconnects the power of the power transmission line.
  • the circuit protection device uses the induction coil to mutual inductance of the primary coil of the transformer, and the current of the primary coil is used as a condition for short circuit and overload protection, thereby providing sensitivity of circuit protection and more effectively protecting the transmission line. , thereby improving the safety of the transmission line.
  • FIG. 1 is a schematic diagram of a circuit protection device according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic diagram of a circuit protection device according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic diagram of an inductive chip in a circuit protection device according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic diagram of a power supply system according to Embodiment 2 of the present invention.
  • the short-circuit and overload prevention measures are usually used to monitor the current of the mains output line by means of fuses or relays.
  • the current of the output line is too large, the power supply of the output line is cut off by the fuse blown or the relay is disconnected to protect the line and the electrical equipment.
  • existing The protection mode has low sensitivity and cannot effectively protect the line in the event of a short circuit or overload.
  • an object of the present invention is to provide a circuit protection device and a power supply system capable of effectively protecting a transmission line in the event of a short circuit or an overload, and improving the safety of the transmission line.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • Embodiments of the present invention provide a circuit protection device, which can be applied to a power supply scenario such as a home, an office, or a factory.
  • the circuit protection device comprises an induction coil L1, a rectifier circuit and an induction chip.
  • the induction coil is used for mutual inductance connection with the primary coil of the transformer, and generates an alternating current induction signal through mutual inductance with the circuit of the primary coil of the transformer.
  • the rectifier circuit is connected between the induction coil L1 and the sensing chip, and is used for rectifying the AC induction signal sensed by the induction coil L1 into a DC induction signal.
  • the sensing chip receives the DC sensing signal. When the DC sensing signal exceeds the preset value, the sensing chip outputs a power-off signal and disconnects the power of the power transmission line.
  • the circuit protection device uses the induction coil L1 to mutual inductance of the primary coil of the transformer, and the current of the primary coil is used as a condition for short circuit and overload protection, thereby providing sensitivity of circuit protection and more effectively protecting the transmission line. , thereby improving the safety of the transmission line.
  • the rectifier circuit is implemented in the form of a rectifier bridge, and the rectifier bridge is specifically composed of four diodes, and the four diodes are a first diode D1, a second diode D2, a third diode D3, and a first diode.
  • the cathode of the first diode D1 is connected to the anode of the second diode D2
  • the cathode of the second diode D2 is connected to the cathode of the fourth diode D4
  • the positive electrode is connected to the negative electrode of the third diode D3
  • the positive electrode of the third diode D3 is connected to the positive electrode of the first diode D1.
  • One end of the induction coil L1 is connected between the first diode D1 and the second diode D2, and the other end of the induction coil L1 is connected between the first diode D3 and the second diode D4 to form a rectification bridge.
  • the AC induction signal sensed by the induction coil L1 can be rectified to form a DC induction signal.
  • the circuit protection device provided by the embodiment of the invention further includes a filter circuit connected between the rectifier circuit and the sensing chip.
  • the filter circuit is composed of a first filter capacitor C1, a second filter capacitor C2 and a filter resistor R1.
  • One end of the first filter capacitor C1 is connected between the second diode D2 and the fourth diode D4, and the first filter capacitor C1 The other end is connected between the first diode D1 and the third diode D3, and the filter resistor R1 and the second filter capacitor C2 are connected in series and connected in parallel across the first filter capacitor C1, and pass through the first filter capacitor C1.
  • the second filter capacitor C2 and the filter resistor R1 filter the DC induction signal to limit the voltage of the DC induction signal to a certain range.
  • the output end of the filter circuit is connected to the power supply terminals V+ and V- of the sensor chip to supply power to the sensor chip.
  • the two ends of the second filter capacitor C2 are the output ends of the filter circuit, and the power terminal V- of the sensor chip Connected between the second filter capacitor C2 and the filter resistor R1, the power terminal V+ of the sensor chip is connected between the first diode D1 and the third diode D3.
  • the circuit protection device further includes an amplifying circuit connected between the filter circuit and the sensing chip.
  • the amplifying circuit is mainly composed of a first variable resistor W1 and a PNP type transistor T1.
  • the DC sensing signal can generate a larger current signal through the amplification of the transistor T1, and the current signal is converted into an induced voltage signal after passing through the second resistor R3. And inputting the first input end a1 of the sensing chip.
  • the Zener diode D5 and the first resistor R2 connected in series with the first variable resistor W1 function as a voltage regulator and a current limit, respectively.
  • One end of the first resistor R2 is connected between the second filter capacitor C2 and the filter resistor R1, and the other end of the first resistor R2 is connected to the first diode D1 and the third via the Zener diode D5 and the first variable resistor W1.
  • the base set of the PNP type transistor T1 is connected to the first variable resistor W1
  • the emitter of the PNP type transistor T1 is connected between the second filter capacitor C2 and the filter resistor R1
  • the collector of the PNP type transistor T1 is connected via the second resistor R3.
  • the first input end a1 of the input inductive chip is connected to the collector of the PNP type transistor T1.
  • the amplifying circuit further includes a second variable resistor W2 for converting the DC induction signal into a reference voltage signal and inputting the second input end a2 of the sensing chip.
  • the second variable resistor W2 is connected in parallel with the second filter capacitor C2, and the second input terminal a2 of the input sensor chip is connected between the second variable resistor W2 and the filter resistor R1.
  • the resistance values of the variable resistors W1 and W2 can be adjusted between 0 and 5.1 k ⁇ , and the specific resistance values of the variable resistors W1 and W2 can be adjusted according to the voltage and current conditions of the application scenario at the time of shipment. Settings.
  • the sensing chip mainly monitors the induced voltage signal received by the first input terminal a1, and outputs a power-off signal according to the change of the induced voltage signal. At the same time, the sensing chip can also monitor the reference voltage signal received by the second input terminal a2, and can also output the power-off signal when the reference voltage signal is abnormal.
  • the sensing chip in this embodiment specifically includes a comparing unit 31 and a triggering unit 32.
  • the comparing unit 31 receives the DC induced signal (ie, the induced voltage signal and the reference voltage signal), and compares the induced voltage signal and the reference voltage signal with corresponding preset values. When the induced voltage signal exceeds the corresponding preset value, or the reference voltage signal exceeds the corresponding preset value, the trigger unit 32 outputs a power-off signal to disconnect the power of the power transmission line.
  • the multi-state trigger is disposed in the trigger unit 32.
  • the multi-stable trigger When the DC induction signal exceeds a preset value, the multi-stable trigger outputs a power-off signal.
  • Multi-stable flip-flops also known as n-state flip-flops, are a further development of bistable contacts. If there is DC coupling between the input of each of the n amplification stages and the output of the remaining stages, then n steady states are obtained under a certain strip, and only one level of conduction is achieved at each steady state, and The rest are closed. In non-binary counting lines, multi-state flip-flops can achieve fast response in many different states, so the response speed is faster than that of the flip-flop.
  • the sensing chip can respond within 0.1 seconds, thereby breaking in a very short time.
  • the power supply is turned on to effectively protect the electrical equipment and the power supply line.
  • the circuit protection device uses the induction coil L1 to mutual inductance of the primary coil of the transformer, and the current of the primary coil is used as a condition for short circuit and overload protection, thereby providing sensitivity of circuit protection and more effectively protecting the transmission line. , thereby improving the safety of the transmission line.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • an embodiment of the present invention provides a power supply system including a transformer TB and the circuit protection device provided in the first embodiment.
  • the primary winding L3 of the transformer TB is connected in series with the induction winding L2, and the induction coil L1 in the circuit protection device is connected to the induction winding L2.
  • Both ends of the secondary coil L4 of the transformer TB serve as an alternating current output terminal, and provide an alternating current power source for the electric equipment.
  • the power supply system provided by the embodiment of the present invention further includes a first relay J1, and an output end of the sensing chip is connected to the control end of the first relay J1.
  • the sensing chip in this embodiment has two output terminals b1 and b2.
  • the first output end b1 of the sensing chip is connected to the control coil of the first relay J1 through the thyristor BG.
  • the second output b2 of the inductive chip is connected to the control terminal of the thyristor BG via a bidirectional diode VD.
  • the thyristor BG also known as the Silicon Controlled Rectifier (SCR), has the characteristics of small size, relatively simple structure, and strong function, and is one of the more commonly used semiconductor devices.
  • the thyristor BG in this embodiment is a unidirectional thyristor, and the unidirectional thyristor is a unidirectional conductive device having a cathode and an anode, and the difference is that one control section is added, which makes it have Diodes have completely different operating characteristics.
  • a level signal is input to the control terminal of the unidirectional thyristor, the cathode and the anode are turned on.
  • the level of the output of the second output terminal b2 of the sensing chip is transmitted to the control terminal of the thyristor BG through the bidirectional diode VD, and the anode and the cathode of the thyristor BG are turned on.
  • the first output terminal b1 of the sensing chip The output level is output to the control coil of the first relay J1 through the thyristor BG, and the output end of the first relay J1 is disconnected, thereby realizing the protection of the power supply line.
  • the power supply system provided by the embodiment of the present invention further includes a second relay J2.
  • the output of the first relay J1 is connected in series with the control coil of the second relay J2, and the output of the second relay J2 is connected in series with the primary coil L3 of the transformer TB.
  • the first relay J1 is a normally closed relay, that is, the output end of the first relay J1 is in a closed state when the control coil is not energized.
  • the second relay J2 is a normally open type relay, that is, the output end of the first relay J1 is in an off state when the control coil is not energized.
  • the control coil of the first relay J1 is not energized, and the output end of the first relay J1 is in a closed state, so the control power supply can supply power to the control coil of the second relay J2 through the first relay J1.
  • the control coil of the second relay J2 is energized, its output terminal is in a closed state to maintain the primary coil L3 of the transformer TB for continuous power supply.
  • the first output terminal b1 and the second output terminal b2 of the sensing chip have no level signal output.
  • the control coil of the first relay J1 When the trigger unit in the sensing chip issues a power-off signal, the control coil of the first relay J1 is energized to disconnect the output of the first relay J1. Since the output end of the first relay J1 is disconnected, the control coil of the second relay J2 is de-energized, and the output end of the second relay J2 is disconnected, thereby disconnecting the grid from the primary coil L3 of the transformer TB to cut off the power supply system.
  • the power supply ensures the protection of the power supply line.
  • the first relay J1 adopts a normally closed type relay
  • the second relay J2 adopts a normally open type relay
  • a plurality of relays for different purposes are connected in series between the control coils, such as relays for arc protection, relays for overvoltage protection, and relays for short circuit protection.
  • These relays also use a normally closed relay, and the output of each relay is connected in series with the control coil of the second relay J2, and when any one of the relays is turned off, the control coil of the second relay J2 can be powered off. Thereby cutting off the power supply of the power system.
  • the power supply system provided by the second embodiment of the present invention has the same technical features as the circuit protection device provided in the first embodiment, so that the same technical problem can be solved and the same technical effect can be achieved.
  • the terms “installation”, “connected”, and “connected” are to be understood broadly, and may be a fixed connection or a detachable connection, unless otherwise explicitly defined and defined. , or connected integrally; can be mechanical or electrical; can be directly connected or through The intermediate medium is indirectly connected and can be internal to the two components.
  • installation can be understood in a specific case by those skilled in the art.
  • Embodiments of the present invention provide a circuit protection device and a power supply system, wherein the circuit protection device includes an induction coil, a rectifier circuit, and an induction chip.
  • the induction coil is used for mutual inductance connection with the primary coil of the transformer, and generates an alternating current induction signal through mutual inductance with the circuit of the primary coil of the transformer.
  • the rectifier circuit is connected between the induction coil and the sensing chip, and is used for rectifying the AC induction signal into a DC induction signal.
  • the sensing chip receives the DC sensing signal. When the DC sensing signal exceeds the preset value, the sensing chip outputs a power-off signal and disconnects the power of the power transmission line.
  • the circuit protection device uses the induction coil to mutual inductance of the primary coil of the transformer, and the current of the primary coil is used as a condition for short circuit and overload protection, thereby providing sensitivity of circuit protection and more effectively protecting the transmission line. , thereby improving the safety of the transmission line.

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  • Emergency Protection Circuit Devices (AREA)

Abstract

L'invention concerne un dispositif de protection de circuit et un système d'alimentation électrique ; ledit dispositif de protection de circuit comprend une bobine d'induction (L1), un circuit redresseur et une puce d'induction ; la bobine d'induction (L1) est utilisée pour une connexion à inductance mutuelle avec l'enroulement primaire d'un transformateur, générant un signal d'induction CA ; le circuit redresseur est connecté entre la bobine d'induction (L1) et la puce d'induction, et le circuit redresseur redresse le signal d'induction CA en un signal d'induction CC ; la puce d'induction reçoit le signal d'induction CC, et si le signal d'induction CC dépasse une valeur prédéfinie, la puce d'induction délivre un signal de mise hors tension. Le dispositif de protection de circuit et le système d'alimentation électrique protègent efficacement une ligne de transmission d'électricité en cas de court-circuit ou de surcharge, améliorant la sécurité des lignes de transmission d'électricité.
PCT/CN2017/088118 2017-02-13 2017-06-13 Dispositif de protection de circuit et système d'alimentation électrique WO2018145381A1 (fr)

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CN201710074965.9 2017-02-13
CN201710074965.9A CN106786350A (zh) 2017-02-13 2017-02-13 电路保护装置以及供电系统

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Publication number Priority date Publication date Assignee Title
CN106786350A (zh) * 2017-02-13 2017-05-31 中领世能（天津）科技有限公司 电路保护装置以及供电系统
CN107068370A (zh) * 2017-06-22 2017-08-18 中领世能（天津）科技有限公司 E型变压器以及安全报警装置

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US6969927B1 (en) * 2004-06-25 2005-11-29 Clipsal Asia Holdings Limited Power switching apparatus
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CN206412743U (zh) * 2017-02-13 2017-08-15 中领世能（天津）科技有限公司 电路保护装置以及供电系统

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CN2140577Y (zh) * 1992-12-22 1993-08-18 王兆印 电动机智能保护节电器
US6969927B1 (en) * 2004-06-25 2005-11-29 Clipsal Asia Holdings Limited Power switching apparatus
CN105977902A (zh) * 2016-06-14 2016-09-28 成都尼奥尔电子科技有限公司 一种基于电压比较电路的led用市电过压保护系统
CN106786350A (zh) * 2017-02-13 2017-05-31 中领世能（天津）科技有限公司 电路保护装置以及供电系统
CN206412743U (zh) * 2017-02-13 2017-08-15 中领世能（天津）科技有限公司 电路保护装置以及供电系统

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