WO2020062817A1 - Control circuit for suppressing surge voltage and current of power supply, and power supply - Google Patents

Control circuit for suppressing surge voltage and current of power supply, and power supply Download PDF

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Publication number
WO2020062817A1
WO2020062817A1 PCT/CN2019/080573 CN2019080573W WO2020062817A1 WO 2020062817 A1 WO2020062817 A1 WO 2020062817A1 CN 2019080573 W CN2019080573 W CN 2019080573W WO 2020062817 A1 WO2020062817 A1 WO 2020062817A1
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WIPO (PCT)
Prior art keywords
circuit
voltage
terminal
power supply
current
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Application number
PCT/CN2019/080573
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French (fr)
Chinese (zh)
Inventor
邹超洋
戴平
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深圳市崧盛电子股份有限公司
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Publication of WO2020062817A1 publication Critical patent/WO2020062817A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/025—Current limitation using field effect transistors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to the technical field of power supplies, and more particularly, to a control circuit and a power supply for suppressing surge voltage and current of a power supply.
  • the startup surge voltage and current of the LED lamp bead will be suddenly increased.
  • the inrush current will increase the load on the power supply and make it difficult to start. Since the LED lamp beads will become brighter with the increase of the current, it will cause the current exceeding the rated specifications to flow through the LED lamp beads at the instant of startup. It goes from dark to bright and then back to normal. Another problem is that the surge voltage and current at the moment of startup will cause the LED lamp beads to decay and die. When the surge voltage and current of the lamp beads exceed the rated specifications, it is easy to burn out the LED lamp beads.
  • the current LED power supply technology mainly uses a current loop to increase the slow-start circuit and extend the charging time of the LED lamp beads to suppress the inrush current. This slow start will cause the slow start to fail when the LED power supply is already normal, and the restart time after the shutdown is extended.
  • the existing LED drive power has the following disadvantages:
  • the startup surge voltage and current are suppressed, but the startup time is prolonged.
  • the technical problem to be solved by the present invention is to provide a control circuit and a power supply for suppressing the surge voltage and current of a power supply in response to the above-mentioned defects of the prior art.
  • the technical solution adopted by the present invention to solve its technical problems is to construct a control circuit that suppresses the surge voltage and current of the power supply, including:
  • a power output terminal a driving circuit for receiving an output voltage of the power source and generating a driving signal according to the output voltage
  • a voltage monitoring circuit connected to a power output terminal for monitoring an output voltage of the power supply and conducting and outputting a conduction signal when the power supply generates a surge voltage
  • a voltage-limiting current-limiting circuit connected to the driving circuit and the negative output terminal of the power supply, respectively;
  • Switch protection circuits respectively connected to the driving circuit, the voltage monitoring circuit and the voltage and current limiting circuit;
  • the voltage-limiting and current-limiting circuit When the output voltage of the power supply is normal, the voltage-limiting and current-limiting circuit is turned on according to the driving signal, so that the output end of the power supply normally outputs voltage; when the power supply generates a surge voltage, the switch protects The circuit is turned on according to a conduction signal output by the voltage monitoring circuit, so that the voltage and current limiting circuit limits the output voltage and output current of the power supply.
  • the driving circuit includes: an RC charging circuit and a first voltage stabilizing circuit;
  • a first terminal of the RC charging circuit is connected to an output terminal of the power source, a second terminal of the RC charging circuit is grounded, and a third terminal of the RC charging circuit is respectively connected to the first terminal of the first voltage stabilizing circuit.
  • the RC charging circuit includes: a resistor R1 and a capacitor C2;
  • the first terminal of the resistor R1 is connected to the output terminal of the power supply, the second terminal of the resistor R1 is connected to the first terminal of the capacitor C2, and the second terminal of the capacitor C2 is grounded.
  • the connection node of the capacitor C2 is also connected to the first terminal of the first voltage stabilization circuit and the control terminal of the voltage and current limiting circuit;
  • a first end of the resistor R1 is a first end of the RC charging circuit
  • a second end of the capacitor C2 is a second end of the RC charging circuit
  • a connection node between the resistor R1 and the capacitor C2 The third terminal of the RC charging circuit.
  • the first voltage stabilizing circuit includes: a third voltage stabilizing tube;
  • a cathode of the third Zener tube is connected to a connection node between the resistor R1 and the capacitor C2, and an anode of the third Zener tube is grounded;
  • the cathode of the third Zener tube is the first end of the first Zener tube, and the anode of the third Zener tube is the second end of the first Zener tube.
  • the voltage and current limiting circuit includes: a power switch and a limiting circuit
  • a first end of the power switch is connected to a third end of the RC charging circuit, a second end of the power switch is connected to a second end of the first voltage stabilization circuit, and a third end of the power switch is grounded;
  • the limiting circuit is connected in parallel between a second terminal and a third terminal of the power switch.
  • the power switch includes a transistor; the limiting circuit includes a current limiting resistor;
  • the gate of the transistor is connected to the third end of the RC charging circuit, the source of the transistor is connected to the second end of the first voltage stabilization circuit, the drain of the transistor is grounded, and the current limiting resistor is connected in parallel. Between a source and a drain of the transistor;
  • the gate of the transistor is the first end of the power switch, the source of the transistor is the second end of the power switch, and the drain of the transistor is the third end of the power switch.
  • the switch protection circuit includes: an on-resistance and a protection switch
  • a first terminal of the on-resistance is connected to a third terminal of the RC charging circuit and a control terminal of the voltage and current limiting circuit, and a second terminal of the on-resistance is connected to a third terminal of the protection switch.
  • the second end of the protection switch is grounded, and the first end of the protection switch is connected to the voltage monitoring circuit.
  • the switch protection circuit further includes a diode D1 and a diode D2;
  • An anode of the diode D1 is connected to a first end of the on-resistance, and a cathode of the diode D1 is connected to a second end of the on-resistance;
  • An anode of the diode D2 is connected to a second end of the protection switch, and a cathode of the diode D2 is grounded.
  • the voltage monitoring circuit includes: a second voltage stabilizing circuit and a voltage dividing circuit;
  • a first terminal of the second voltage stabilization circuit is connected to an output terminal of the power supply, a second terminal of the second voltage stabilization circuit is connected to a first terminal of the voltage division circuit, and a second terminal of the voltage division circuit The output terminal of the voltage dividing circuit is connected to the switch protection circuit.
  • the invention also provides a power supply, which includes the control circuit for suppressing the surge voltage and current of the power supply described above.
  • the implementation of the control circuit for suppressing the surge voltage and current of the power supply of the present invention has the following beneficial effects: includes: a driving circuit connected to the power output terminal, receiving a power supply output voltage and generating a driving signal according to the output voltage; and a power output terminal and a monitoring power supply A voltage monitoring circuit that outputs a voltage and is turned on when a power supply generates a surge voltage, and outputs a conduction signal; a voltage-limiting and current-limiting circuit connected to the driving circuit and the negative output terminal of the power supply respectively; and a driving circuit, a voltage monitoring circuit, and a limiting circuit A switch protection circuit connected to the voltage limiting circuit; when the output voltage of the power supply is normal, the voltage limiting current limiting circuit is turned on according to the driving signal to make the power output terminal normally output voltage; when the power supply generates a surge voltage, the switch protection circuit is based on The conduction signal output from the voltage monitoring circuit is turned on, so that the voltage and current limiting circuit limits the output voltage and output current of the power supply
  • FIG. 1 is a schematic structural diagram of a control circuit for suppressing a surge voltage and current of a power supply according to an embodiment of the present invention
  • FIG. 2 is a circuit schematic diagram of a control circuit for suppressing surge voltage and current of a power supply according to an embodiment of the present invention.
  • FIG. 1 it is a schematic structural diagram of a control circuit for suppressing a surge voltage and current of a power supply according to an embodiment of the present invention.
  • the control circuit for suppressing the power supply surge voltage and current is built in the power supply. By setting the control circuit, the power supply surge voltage and current can be effectively suppressed, and the power supply and the load are effectively protected.
  • the power source includes, but is not limited to, an LED driving power source.
  • the control circuit for suppressing a surge voltage and current of a power supply includes: a driving circuit 10 connected to a power output terminal, for receiving an output voltage of the power supply, and generating a driving signal according to the output voltage; and Power output terminal, a voltage monitoring circuit 30 for monitoring the output voltage of the power source and conducting and outputting a conduction signal when the power source generates a surge voltage; a voltage limiting current limiting circuit connected to the driving circuit 10 and the negative output terminal of the power source, respectively 40; a switch protection circuit 20 connected to the driving circuit 10, the voltage monitoring circuit 30, and the voltage limiting current limiting circuit 40, respectively.
  • the voltage-limiting and current-limiting circuit 40 When the output voltage of the power supply is normal, the voltage-limiting and current-limiting circuit 40 is turned on according to the driving signal, so that the power output terminal normally outputs a voltage.
  • the switch protection circuit 20 When the power supply generates a surge voltage, the switch protection circuit 20 is turned on according to the output of the voltage monitoring circuit 30 The signal is turned on, so that the voltage limiting current limiting circuit 40 limits the output voltage and output current of the power supply.
  • the output voltage of the power supply when the output voltage of the power supply is normal, that is, when there is no surge voltage or current in the power supply, the output voltage of the power supply normally charges the driving circuit 10 and generates a normal driving signal (the driving signal is a voltage signal).
  • the driving signal is transmitted to the voltage-limiting and current-limiting circuit 40, so that the voltage-limiting and current-limiting circuit 40 is normally turned on, and then the power output terminal normally outputs a voltage.
  • the voltage monitoring circuit 30 can detect the surge voltage and turn on, and then output a corresponding conduction signal to the switch protection circuit 20 to make the switch protection circuit 20 conductive.
  • the conduction effect makes the voltage-limiting and current-limiting circuit 40 be in a voltage-limiting and current-limiting conducting state, thereby limiting the output voltage and output current of the power supply, achieving the purpose of effectively suppressing the surge voltage current of the power supply, and avoiding the load due to the surge voltage voltage of the power supply. Oversized and burnt out.
  • the control circuit for suppressing the surge voltage and current of the power supply compared with the conventional increase of the startup circuit through the current loop, can not only effectively suppress the surge voltage and current, but also not prolong the startup time of the power supply.
  • FIG. 2 it is a circuit schematic diagram of a control circuit for suppressing a power surge voltage and current according to an embodiment of the present invention.
  • the driving circuit 10 includes an RC charging circuit 101 and a first voltage stabilizing circuit 102.
  • the first terminal of the RC charging circuit 101 is connected to the output terminal of the power supply, the second terminal of the RC charging circuit 101 is connected to the ground, and the third terminal of the RC charging circuit 101 is connected to the first terminal of the first voltage stabilization circuit 102 and the voltage and current limiting circuit, respectively.
  • the control terminal of 40 and the switch protection circuit 20; the second terminal of the first voltage stabilization circuit 102 is grounded.
  • the RC charging circuit 101 includes a resistor R1 and a capacitor C2.
  • the first terminal of the resistor R1 is connected to the output terminal of the power supply, the second terminal of the resistor R1 is connected to the first terminal of the capacitor C2, and the second terminal of the capacitor C2 is grounded.
  • the connection nodes of the resistor R1 and the capacitor C2 are also connected to the first voltage stabilization circuit, respectively.
  • the first terminal of the resistor R1 is the first terminal of the RC charging circuit 101
  • the second terminal of the capacitor C2 is the second terminal of the RC charging circuit 101
  • the connection node between the resistor R1 and the capacitor C2 is the third terminal of the RC charging circuit 101. end.
  • the first voltage stabilizing circuit 102 includes a third voltage stabilizing tube ZD3.
  • the cathode of the third Zener tube ZD3 is connected to the connection node of the resistor R1 and the capacitor C2, and the anode of the third Zener tube ZD3 is grounded.
  • the cathode of the third Zener tube ZD3 is the first end of the first Zener circuit 102, and the anode of the third Zener tube ZD3 is the second end of the first Zener circuit 102.
  • the voltage and current limiting circuit 40 includes a power switch and a limiting circuit.
  • the first end of the power switch is connected to the third end of the RC charging circuit 101, the second end of the power switch is connected to the second end of the first voltage stabilization circuit 102, and the third end of the power switch is grounded; the limiting circuit is connected in parallel to the first end of the power switch Between the second and third ends.
  • the power switch includes a transistor Q2; the limiting circuit includes a current limiting resistor R5.
  • the gate of the transistor Q2 is connected to the third terminal of the RC charging circuit 101, the source of the transistor Q2 is connected to the second terminal of the first voltage stabilization circuit 102, and the drain of the transistor Q2 is grounded; the current limiting resistor R5 is connected in parallel to the source of the transistor Q2 And drain; the gate of transistor Q2 is the first end of the power switch, the source of transistor Q2 is the second end of the power switch, and the drain of transistor Q2 is the third end of the power switch.
  • the transistor Q2 is a high-power transistor.
  • the current-limiting resistor R5 is a large resistor.
  • the high-power transistor Q2 when the output voltage of the power supply is normal, the high-power transistor Q2 is turned on, and the power output terminal works normally.
  • the high-power transistor Q2 When the power supply encounters a surge voltage that causes the output voltage to overshoot or become abnormal, the high-power transistor Q2 is turned off, and the output current can only flow through the current-limiting resistor R5, which is a large resistor. Therefore, the current-limiting resistor R5 can limit the The output voltage and current of the power supply effectively suppress the surge voltage and current of the power supply.
  • the switch protection circuit 20 includes an on-resistance R2 and a protection switch.
  • the first terminal of the on-resistance R2 is connected to the third terminal of the RC charging circuit 101 and the control terminal of the voltage and current limiting circuit 40.
  • the second terminal of the on-resistance R2 is connected to the third terminal of the protection switch and the second terminal of the protection switch.
  • the first terminal of the protection switch is connected to the voltage monitoring circuit 30.
  • the switch protection circuit 20 further includes a diode D1 and a diode D2.
  • the anode of the diode D1 is connected to the first end of the on-resistance R2, the cathode of the diode D1 is connected to the second end of the on-resistance R2; the anode of the diode D2 is connected to the second end of the protection switch, and the cathode of the diode D2 is grounded.
  • the protection switch may be a transistor Q1.
  • the base of transistor Q1 protects the first end of the switch, the emitter of transistor Q1 protects the second end of the switch, and the collector of transistor Q1 is the third end of the protection switch.
  • the protection switch may also use the transistor Q2.
  • the voltage monitoring circuit 30 includes a second voltage stabilizing circuit 301 and a voltage dividing circuit 302.
  • the first end of the second voltage stabilization circuit 301 is connected to the output end of the power supply, the second end of the second voltage stabilization circuit 301 is connected to the first end of the voltage division circuit 302, the second end of the voltage division circuit 302 is grounded, and the voltage division circuit 302 The output terminal is connected to the switch protection circuit 20.
  • the second voltage stabilizing circuit 301 may be composed of a plurality of voltage stabilizing tubes in series, and the voltage dividing circuit 302 may be composed of a plurality of resistors. Among them, the plurality of resistors may implement voltage division in series, parallel, and series-parallel modes.
  • the second voltage regulator circuit 301 includes a first voltage regulator ZD1 and a second voltage regulator ZD2.
  • the voltage dividing circuit 302 includes a third voltage dividing resistor R3 and a fourth voltage dividing resistor R4.
  • the cathode of the first Zener ZD1 is connected to the output end of the power supply
  • the anode of the first Zener ZD1 is connected to the cathode of the second Zener ZD2
  • the anode of the second Zener ZD2 is connected to the third voltage dividing resistor R3
  • the first terminal of the third voltage dividing resistor R3 is connected to the first terminal of the fourth voltage dividing resistor R4, the second terminal of the fourth voltage dividing resistor R4 is grounded, and the second terminal of the third voltage dividing resistor R3 and
  • the connection end of the first end of the fourth piezoelectric element is also connected to the switch protection circuit 20 (that is, as shown in FIG. 2, connected to the base of the transistor Q1).
  • the cathode of the first Zener tube ZD1 is the first end of the second Zener circuit 301
  • the anode of the second Zener tube ZD2 is the second end of the Second Zener circuit 301
  • the third One end is the first end of the voltage divider circuit 302
  • the second end of the fourth voltage divider resistor R4 is the second end of the voltage divider circuit 302
  • a connection terminal at one end is an output terminal of the voltage dividing circuit 302.
  • the output voltage is less than the first The sum of the threshold voltages of a Zener ZD1 and a Second Zener ZD2, the first Zener ZD1 and the second Zener ZD2 are turned off, so there is not enough voltage on the base of transistor Q1 to make it conductive , Transistor Q1 is in the off state.
  • the output voltage of the power supply overshoots.
  • the first voltage regulator ZD1 and the second voltage regulator ZD2 are turned on, and a voltage is formed on the fourth voltage dividing resistor R4R4.
  • This voltage can make the transistor Q1 Is turned on, so transistor Q1 is turned on. Due to the conduction of the transistor Q1, the voltage on the gate of the high-power transistor Q2 is connected to ground, and the high-power transistor Q2 is turned off.
  • the output current can only flow through the current-limiting resistor R5, and the current-limiting resistor R5 is a large resistor.
  • the current limiting resistor R5 can limit the output voltage and current of the power supply, thereby achieving the purpose of effectively suppressing the surge voltage and current of the power supply and effectively protecting the power supply and the load. Understandably, after the output voltage and current of the power supply are normal, the first Zener ZD1 and the second Zener ZD2 return to the off state again (non-conducting), the transistor Q1 is turned off, and the high-power transistor Q2 is normally turned on. Restore normal output.
  • the invention utilizes the on and off of the voltage regulator tube and the transistor Q2 to absorb the abnormal surge voltage and current appearing instantaneously in the power switch, and automatically adjusts the output voltage and output current, thereby greatly improving the reliability of the power supply.
  • the present invention is very simple and reliable to implement these functions. It uses a full hardware control method with high reliability and can completely suppress the surge and abnormal overshoot of the output voltage and current.
  • the present invention also provides a power source, which includes the control circuit for suppressing the surge voltage and current of the power source in the foregoing embodiment.
  • the power source includes, but is not limited to, an LED driving power source.
  • the LED driving power supply can effectively suppress the abnormal surge voltage and current of the LED driving power supply at the moment of switching on and off by setting the control circuit for suppressing the power supply surge voltage and current inside, and automatically adjust the output voltage of the LED driving power supply and
  • the output current greatly improves the reliability of the LED driving power supply, and adopts a full hardware control method with high reliability. It can completely suppress the output voltage and current surge and abnormal overshoot of the LED driving power supply, and it will not extend the LED driving. Power on time.

Abstract

Disclosed are a control circuit for suppressing a surge voltage and current of a power supply, and a power supply, comprising: a driving circuit (11) for generating a driving signal according to an output voltage, a voltage monitoring circuit (14) for being turned on and outputting an ON signal when a power supply generates a surge voltage, a voltage- and current-limiting circuit (13) and a switch protection circuit (12), wherein when the output voltage of the power supply is normal, the voltage- and current-limiting circuit (13) is turned on, such that an output end of the power supply normally outputs a voltage, and when the power supply generates the surge voltage, the voltage- and current-limiting circuit (13) limits the output voltage and an output current of the power supply so as to suppress the surge voltage and current of the power supply to protect the power supply and a load.

Description

一种抑制电源浪涌电压电流的控制电路及电源Control circuit and power supply for suppressing power supply surge voltage and current 技术领域Technical field
本发明涉及电源的技术领域，更具体地说，涉及一种抑制电源浪涌电压电流的控制电路及电源。The present invention relates to the technical field of power supplies, and more particularly, to a control circuit and a power supply for suppressing surge voltage and current of a power supply.
背景技术Background technique
LED电源在启动之后，当各环路电压已稳定，各系统电压与电容已经充电完成，此时在LED灯珠端如果突然做负载切换动作 ，开机之后LED灯珠的启动浪涌电压和电流会突然增大。而浪涌电流会导致电源负担加重，启动困难，由于LED灯珠是随着电流的加大而更加变亮，导致启动瞬间有超过额定规格的电流流过LED灯珠，人眼很明显的看到灯珠从暗到明亮然后又到正常的过程。另一个问题就是启动瞬间的浪涌电压电流会导致LED灯珠的光衰与死灯，当灯珠的浪涌电压电流超过额定规格，很容易将LED灯珠烧坏。After the LED power supply is started, when the loop voltage has stabilized and the system voltage and capacitors have been charged, at this time, if the load switching action is suddenly performed at the LED lamp end, the startup surge voltage and current of the LED lamp bead will be Suddenly increased. The inrush current will increase the load on the power supply and make it difficult to start. Since the LED lamp beads will become brighter with the increase of the current, it will cause the current exceeding the rated specifications to flow through the LED lamp beads at the instant of startup. It goes from dark to bright and then back to normal. Another problem is that the surge voltage and current at the moment of startup will cause the LED lamp beads to decay and die. When the surge voltage and current of the lamp beads exceed the rated specifications, it is easy to burn out the LED lamp beads.
现有的LED电源技术主要是通过电流环增加缓启动线路，延长LED灯珠的充电时间来实现抑制浪涌电流。而这个缓启动在LED电源已经是正常的情况会导致缓启动失效，并且在关机后的重启时间延长。The current LED power supply technology mainly uses a current loop to increase the slow-start circuit and extend the charging time of the LED lamp beads to suppress the inrush current. This slow start will cause the slow start to fail when the LED power supply is already normal, and the restart time after the shutdown is extended.
综上，现有的LED驱动电源存在如下弊端：In summary, the existing LED drive power has the following disadvantages:
输出端启动浪涌电压电流大，LED灯珠容易被烧坏；The output surge voltage and current at the output end are large, and the LED lamp beads are easily burned out;
启动浪涌电压电流得到抑制，但是启动时间延长。The startup surge voltage and current are suppressed, but the startup time is prolonged.
技术问题technical problem
本发明要解决的技术问题在于，针对现有技术的上述缺陷，提供一种抑制电源浪涌电压电流的控制电路及电源。The technical problem to be solved by the present invention is to provide a control circuit and a power supply for suppressing the surge voltage and current of a power supply in response to the above-mentioned defects of the prior art.
技术解决方案Technical solutions
本发明解决其技术问题所采用的技术方案是：构造一种抑制电源浪涌电压电流的控制电路，包括：The technical solution adopted by the present invention to solve its technical problems is to construct a control circuit that suppresses the surge voltage and current of the power supply, including:
与电源输出端、用于接收电源的输出电压并根据所述输出电压产生驱动信号的驱动电路；And a power output terminal, a driving circuit for receiving an output voltage of the power source and generating a driving signal according to the output voltage;
与电源输出端、用于监测所述电源的输出电压并在所述电源产生浪涌电压时导通并输出导通信号的电压监测电路；A voltage monitoring circuit connected to a power output terminal for monitoring an output voltage of the power supply and conducting and outputting a conduction signal when the power supply generates a surge voltage;
分别与所述驱动电路和所述电源的负输出端连接的限压限流电路；A voltage-limiting current-limiting circuit connected to the driving circuit and the negative output terminal of the power supply, respectively;
分别与所述驱动电路、所述电压监测电路和所述限压限流电路连接的开关保护电路；Switch protection circuits respectively connected to the driving circuit, the voltage monitoring circuit and the voltage and current limiting circuit;
在所述电源的输出电压正常时，所述限压限流电路根据所述驱动信号导通，以使所述电源输出端正常输出电压；在所述电源产生浪涌电压时，所述开关保护电路根据所述电压监测电路输出的导通信号导通，使所述限压限流电路限制电源的输出电压和输出电流。When the output voltage of the power supply is normal, the voltage-limiting and current-limiting circuit is turned on according to the driving signal, so that the output end of the power supply normally outputs voltage; when the power supply generates a surge voltage, the switch protects The circuit is turned on according to a conduction signal output by the voltage monitoring circuit, so that the voltage and current limiting circuit limits the output voltage and output current of the power supply.
在其中一个实施例中，所述驱动电路包括：RC充电电路和第一稳压电路；In one embodiment, the driving circuit includes: an RC charging circuit and a first voltage stabilizing circuit;
所述RC充电电路的第一端连接所述电源的输出端，所述RC充电电路的第二端接地，所述RC充电电路的第三端分别连接所述第一稳压电路的第一端、所述限压限流电路的控制端以及所述开关保护电路；所述第一稳压电路的第二端接地。A first terminal of the RC charging circuit is connected to an output terminal of the power source, a second terminal of the RC charging circuit is grounded, and a third terminal of the RC charging circuit is respectively connected to the first terminal of the first voltage stabilizing circuit. A control terminal of the voltage and current limiting circuit and the switch protection circuit; a second terminal of the first voltage stabilizing circuit is grounded.
在其中一个实施例中，所述RC充电电路包括：电阻R1和电容C2；In one embodiment, the RC charging circuit includes: a resistor R1 and a capacitor C2;
所述电阻R1的第一端连接所述电源的输出端，所述电阻R1的第二端连接所述电容C2的第一端，所述电容C2的第二端接地，所述电阻R1和所述电容C2的连接节点还分别连接所述第一稳压电路的第一端和所述限压限流电路的控制端；The first terminal of the resistor R1 is connected to the output terminal of the power supply, the second terminal of the resistor R1 is connected to the first terminal of the capacitor C2, and the second terminal of the capacitor C2 is grounded. The connection node of the capacitor C2 is also connected to the first terminal of the first voltage stabilization circuit and the control terminal of the voltage and current limiting circuit;
所述电阻R1的第一端为所述RC充电电路的第一端，所述电容C2的第二端为所述RC充电电路的第二端，所述电阻R1和所述电容C2的连接节点为所述RC充电电路的第三端。A first end of the resistor R1 is a first end of the RC charging circuit, a second end of the capacitor C2 is a second end of the RC charging circuit, and a connection node between the resistor R1 and the capacitor C2 The third terminal of the RC charging circuit.
在其中一个实施例中，所述第一稳压电路包括：第三稳压管；In one embodiment, the first voltage stabilizing circuit includes: a third voltage stabilizing tube;
所述第三稳压管的阴极连接所述电阻R1和所述电容C2的连接节点，所述第三稳压管的阳极接地；A cathode of the third Zener tube is connected to a connection node between the resistor R1 and the capacitor C2, and an anode of the third Zener tube is grounded;
所述第三稳压管的阴极为所述第一稳压电路的第一端，所述第三稳压管的阳极为所述第一稳压电路的第二端。The cathode of the third Zener tube is the first end of the first Zener tube, and the anode of the third Zener tube is the second end of the first Zener tube.
在其中一个实施例中，所述限压限流电路包括：功率开关和限制电路；In one embodiment, the voltage and current limiting circuit includes: a power switch and a limiting circuit;
所述功率开关的第一端连接所述RC充电电路的第三端，所述功率开关的第二端连接所述第一稳压电路的第二端，所述功率开关的第三端接地；所述限制电路并联在所述功率开关的第二端和第三端之间。A first end of the power switch is connected to a third end of the RC charging circuit, a second end of the power switch is connected to a second end of the first voltage stabilization circuit, and a third end of the power switch is grounded; The limiting circuit is connected in parallel between a second terminal and a third terminal of the power switch.
在其中一个实施例中，所述功率开关包括晶体管；所述限制电路包括限流电阻；In one embodiment, the power switch includes a transistor; the limiting circuit includes a current limiting resistor;
所述晶体管的栅极连接所述RC充电电路的第三端，所述晶体管的源极连接所述第一稳压电路的第二端，所述晶体管的漏极接地；所述限流电阻并联在所述晶体管的源极和漏极之间；The gate of the transistor is connected to the third end of the RC charging circuit, the source of the transistor is connected to the second end of the first voltage stabilization circuit, the drain of the transistor is grounded, and the current limiting resistor is connected in parallel. Between a source and a drain of the transistor;
所述晶体管的栅极为所述功率开关的第一端，所述晶体管的源极为所述功率开关的第二端，所述晶体管的漏极为所述功率开关的第三端。The gate of the transistor is the first end of the power switch, the source of the transistor is the second end of the power switch, and the drain of the transistor is the third end of the power switch.
在其中一个实施例中，所述开关保护电路包括：导通电阻和保护开关；In one embodiment, the switch protection circuit includes: an on-resistance and a protection switch;
所述导通电阻的第一端连接RC充电电路的第三端和所述限压限流电路的控制端，所述导通电阻的第二端连接所述保护开关的第三端，所述保护开关的第二端接地，所述保护开关的第一端连接所述电压监测电路。A first terminal of the on-resistance is connected to a third terminal of the RC charging circuit and a control terminal of the voltage and current limiting circuit, and a second terminal of the on-resistance is connected to a third terminal of the protection switch. The second end of the protection switch is grounded, and the first end of the protection switch is connected to the voltage monitoring circuit.
在其中一个实施例中，所述开关保护电路还包括二极管D1和二极管D2；In one embodiment, the switch protection circuit further includes a diode D1 and a diode D2;
所述二极管D1的阳极连接所述导通电阻的第一端，所述二极管D1的阴极连接所述导通电阻的第二端；An anode of the diode D1 is connected to a first end of the on-resistance, and a cathode of the diode D1 is connected to a second end of the on-resistance;
所述二极管D2的阳极连接所述保护开关的第二端，所述二极管D2的阴极接地。An anode of the diode D2 is connected to a second end of the protection switch, and a cathode of the diode D2 is grounded.
在其中一个实施例中，所述电压监测电路包括：第二稳压电路和分压电路；In one embodiment, the voltage monitoring circuit includes: a second voltage stabilizing circuit and a voltage dividing circuit;
所述第二稳压电路的第一端连接所述电源的输出端，所述第二稳压电路的第二端连接所述分压电路的第一端，所述分压电路的第二端接地，所述分压电路的输出端连接所述开关保护电路。A first terminal of the second voltage stabilization circuit is connected to an output terminal of the power supply, a second terminal of the second voltage stabilization circuit is connected to a first terminal of the voltage division circuit, and a second terminal of the voltage division circuit The output terminal of the voltage dividing circuit is connected to the switch protection circuit.
本发明还提供一种电源，包括以上所述的抑制电源浪涌电压电流的控制电路。The invention also provides a power supply, which includes the control circuit for suppressing the surge voltage and current of the power supply described above.
有益效果Beneficial effect
实施本发明的抑制电源浪涌电压电流的控制电路，具有以下有益效果：包括：与电源输出端、接收电源的输出电压并根据输出电压产生驱动信号的驱动电路；与电源输出端、监测电源的输出电压并在电源产生浪涌电压时导通并输出导通信号的电压监测电路；分别与驱动电路和电源的负输出端连接的限压限流电路；分别与驱动电路、电压监测电路和限压限流电路连接的开关保护电路；在电源的输出电压正常时，限压限流电路根据驱动信号导通，以使电源输出端正常输出电压；在电源产生浪涌电压时，开关保护电路根据电压监测电路输出的导通信号导通，使限压限流电路限制电源的输出电压和输出电流。本方案可以抑制电源的浪涌电压和电流，从而达到保护电源和负载的效果。The implementation of the control circuit for suppressing the surge voltage and current of the power supply of the present invention has the following beneficial effects: includes: a driving circuit connected to the power output terminal, receiving a power supply output voltage and generating a driving signal according to the output voltage; and a power output terminal and a monitoring power supply A voltage monitoring circuit that outputs a voltage and is turned on when a power supply generates a surge voltage, and outputs a conduction signal; a voltage-limiting and current-limiting circuit connected to the driving circuit and the negative output terminal of the power supply respectively; and a driving circuit, a voltage monitoring circuit, and a limiting circuit A switch protection circuit connected to the voltage limiting circuit; when the output voltage of the power supply is normal, the voltage limiting current limiting circuit is turned on according to the driving signal to make the power output terminal normally output voltage; when the power supply generates a surge voltage, the switch protection circuit is based on The conduction signal output from the voltage monitoring circuit is turned on, so that the voltage and current limiting circuit limits the output voltage and output current of the power supply. This solution can suppress the surge voltage and current of the power supply, thereby achieving the effect of protecting the power supply and the load.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
下面将结合附图及实施例对本发明作进一步说明，附图中：The present invention will be further described below with reference to the accompanying drawings and embodiments. In the drawings:
图1是本发明实施例提供的一种抑制电源浪涌电压电流的控制电路的结构示意图；FIG. 1 is a schematic structural diagram of a control circuit for suppressing a surge voltage and current of a power supply according to an embodiment of the present invention;
图2是本发明实施例提供的一种抑制电源浪涌电压电流的控制电路的电路原理图。FIG. 2 is a circuit schematic diagram of a control circuit for suppressing surge voltage and current of a power supply according to an embodiment of the present invention.
本发明的最佳实施方式Best Mode of the Invention
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
参考图1，为本发明实施例提供的一种抑制电源浪涌电压电流的控制电路的结构示意图。该抑制电源浪涌电压电流的控制电路内置于电源内，通过设置该控制电路可以有效抑制电源的浪涌电压和电流，有效保护电源和负载。这里，电源包括但不限于LED驱动电源。Referring to FIG. 1, it is a schematic structural diagram of a control circuit for suppressing a surge voltage and current of a power supply according to an embodiment of the present invention. The control circuit for suppressing the power supply surge voltage and current is built in the power supply. By setting the control circuit, the power supply surge voltage and current can be effectively suppressed, and the power supply and the load are effectively protected. Here, the power source includes, but is not limited to, an LED driving power source.
如图1所示，本发明实施例中，该抑制电源浪涌电压电流的控制电路，包括：与电源输出端、用于接收电源的输出电压并根据输出电压产生驱动信号的驱动电路10；与电源输出端、用于监测电源的输出电压并在电源产生浪涌电压时导通并输出导通信号的电压监测电路30；分别与驱动电路10和电源的负输出端连接的限压限流电路40；分别与驱动电路10、电压监测电路30和限压限流电路40连接的开关保护电路20。As shown in FIG. 1, in the embodiment of the present invention, the control circuit for suppressing a surge voltage and current of a power supply includes: a driving circuit 10 connected to a power output terminal, for receiving an output voltage of the power supply, and generating a driving signal according to the output voltage; and Power output terminal, a voltage monitoring circuit 30 for monitoring the output voltage of the power source and conducting and outputting a conduction signal when the power source generates a surge voltage; a voltage limiting current limiting circuit connected to the driving circuit 10 and the negative output terminal of the power source, respectively 40; a switch protection circuit 20 connected to the driving circuit 10, the voltage monitoring circuit 30, and the voltage limiting current limiting circuit 40, respectively.
在电源的输出电压正常时，限压限流电路40根据驱动信号导通，以使电源输出端正常输出电压；在电源产生浪涌电压时，开关保护电路20根据电压监测电路30输出的导通信号导通，使限压限流电路40限制电源的输出电压和输出电流。When the output voltage of the power supply is normal, the voltage-limiting and current-limiting circuit 40 is turned on according to the driving signal, so that the power output terminal normally outputs a voltage. When the power supply generates a surge voltage, the switch protection circuit 20 is turned on according to the output of the voltage monitoring circuit 30 The signal is turned on, so that the voltage limiting current limiting circuit 40 limits the output voltage and output current of the power supply.
具体的，在电源的输出电压正常时，即电源不存在浪涌电压或电流时，电源的输出电压给驱动电路10进行正常充电，并产生正常的驱动信号（该驱动信号为电压信号），该驱动信号传送至限压限流电路40，使限压限流电路40正常导通，进而使电源输出端正常输出电压。当电源存在浪涌电压时，电压监测电路30可监测到该浪涌电压并导通，进而输出相应的导通信号至开关保护电路20，使开关保护电路20导通，通过开关保护电路20的导通作用使限压限流电路40处于限压限流导通状态，进而限制电源的输出电压和输出电流，达到有效抑制电源的浪涌电压电流的目的，避免负载因电源的浪涌电压电压过大而被烧坏。另外，该抑制电源浪涌电压电流的控制电路相较于传统的通过电流环增加启动线路，不仅可以使浪涌电压电流得到有效抑制，还不会延长电源的启动时间。Specifically, when the output voltage of the power supply is normal, that is, when there is no surge voltage or current in the power supply, the output voltage of the power supply normally charges the driving circuit 10 and generates a normal driving signal (the driving signal is a voltage signal). The driving signal is transmitted to the voltage-limiting and current-limiting circuit 40, so that the voltage-limiting and current-limiting circuit 40 is normally turned on, and then the power output terminal normally outputs a voltage. When the power supply has a surge voltage, the voltage monitoring circuit 30 can detect the surge voltage and turn on, and then output a corresponding conduction signal to the switch protection circuit 20 to make the switch protection circuit 20 conductive. The conduction effect makes the voltage-limiting and current-limiting circuit 40 be in a voltage-limiting and current-limiting conducting state, thereby limiting the output voltage and output current of the power supply, achieving the purpose of effectively suppressing the surge voltage current of the power supply, and avoiding the load due to the surge voltage voltage of the power supply. Oversized and burnt out. In addition, the control circuit for suppressing the surge voltage and current of the power supply, compared with the conventional increase of the startup circuit through the current loop, can not only effectively suppress the surge voltage and current, but also not prolong the startup time of the power supply.
如图2所示，为本发明实施例的抑制电源浪涌电压电流的控制电路的电路原理图。As shown in FIG. 2, it is a circuit schematic diagram of a control circuit for suppressing a power surge voltage and current according to an embodiment of the present invention.
本发明实施例中，该驱动电路10包括：RC充电电路101和第一稳压电路102。In the embodiment of the present invention, the driving circuit 10 includes an RC charging circuit 101 and a first voltage stabilizing circuit 102.
RC充电电路101的第一端连接电源的输出端，RC充电电路101的第二端接地，RC充电电路101的第三端分别连接第一稳压电路102的第一端、限压限流电路40的控制端以及开关保护电路20；第一稳压电路102的第二端接地。The first terminal of the RC charging circuit 101 is connected to the output terminal of the power supply, the second terminal of the RC charging circuit 101 is connected to the ground, and the third terminal of the RC charging circuit 101 is connected to the first terminal of the first voltage stabilization circuit 102 and the voltage and current limiting circuit, respectively. The control terminal of 40 and the switch protection circuit 20; the second terminal of the first voltage stabilization circuit 102 is grounded.
具体的，该RC充电电路101包括：电阻R1和电容C2。Specifically, the RC charging circuit 101 includes a resistor R1 and a capacitor C2.
电阻R1的第一端连接电源的输出端，电阻R1的第二端连接电容C2的第一端，电容C2的第二端接地，电阻R1和电容C2的连接节点还分别连接第一稳压电路102的第一端和限压限流电路40的控制端。其中，电阻R1的第一端为RC充电电路101的第一端，电容C2的第二端为RC充电电路101的第二端，电阻R1和电容C2的连接节点为RC充电电路101的第三端。The first terminal of the resistor R1 is connected to the output terminal of the power supply, the second terminal of the resistor R1 is connected to the first terminal of the capacitor C2, and the second terminal of the capacitor C2 is grounded. The connection nodes of the resistor R1 and the capacitor C2 are also connected to the first voltage stabilization circuit, respectively. The first terminal of 102 and the control terminal of the voltage and current limiting circuit 40. The first terminal of the resistor R1 is the first terminal of the RC charging circuit 101, the second terminal of the capacitor C2 is the second terminal of the RC charging circuit 101, and the connection node between the resistor R1 and the capacitor C2 is the third terminal of the RC charging circuit 101. end.
该第一稳压电路102包括：第三稳压管ZD3。The first voltage stabilizing circuit 102 includes a third voltage stabilizing tube ZD3.
第三稳压管ZD3的阴极连接电阻R1和电容C2的连接节点，第三稳压管ZD3的阳极接地。其中，第三稳压管ZD3的阴极为第一稳压电路102的第一端，第三稳压管ZD3的阳极为第一稳压电路102的第二端。The cathode of the third Zener tube ZD3 is connected to the connection node of the resistor R1 and the capacitor C2, and the anode of the third Zener tube ZD3 is grounded. The cathode of the third Zener tube ZD3 is the first end of the first Zener circuit 102, and the anode of the third Zener tube ZD3 is the second end of the first Zener circuit 102.
该限压限流电路40包括：功率开关和限制电路。The voltage and current limiting circuit 40 includes a power switch and a limiting circuit.
功率开关的第一端连接RC充电电路101的第三端，功率开关的第二端连接第一稳压电路102的第二端，功率开关的第三端接地；限制电路并联在功率开关的第二端和第三端之间。The first end of the power switch is connected to the third end of the RC charging circuit 101, the second end of the power switch is connected to the second end of the first voltage stabilization circuit 102, and the third end of the power switch is grounded; the limiting circuit is connected in parallel to the first end of the power switch Between the second and third ends.
其中，功率开关包括晶体管Q2；限制电路包括限流电阻R5。The power switch includes a transistor Q2; the limiting circuit includes a current limiting resistor R5.
晶体管Q2的栅极连接RC充电电路101的第三端，晶体管Q2的源极连接第一稳压电路102的第二端，晶体管Q2的漏极接地；限流电阻R5并联在晶体管Q2的源极和漏极之间；晶体管Q2的栅极为功率开关的第一端，晶体管Q2的源极为功率开关的第二端，晶体管Q2的漏极为功率开关的第三端。The gate of the transistor Q2 is connected to the third terminal of the RC charging circuit 101, the source of the transistor Q2 is connected to the second terminal of the first voltage stabilization circuit 102, and the drain of the transistor Q2 is grounded; the current limiting resistor R5 is connected in parallel to the source of the transistor Q2 And drain; the gate of transistor Q2 is the first end of the power switch, the source of transistor Q2 is the second end of the power switch, and the drain of transistor Q2 is the third end of the power switch.
本发明实施例中，晶体管Q2为大功率晶体管。限流电阻R5为大电阻。In the embodiment of the present invention, the transistor Q2 is a high-power transistor. The current-limiting resistor R5 is a large resistor.
如图2所示，电源输出电压正常时，大功率晶体管Q2导通，电源输出端正常工作。电源遭遇浪涌电压使输出电压过冲或异常时，大功率晶体管Q2截止，输出电流只能从限流电阻R5上流过，而限流电阻R5为大电阻，因此，通过限流电阻R5可以限制电源的输出电压和电流，有效抑制电源的浪涌电压电流。As shown in Figure 2, when the output voltage of the power supply is normal, the high-power transistor Q2 is turned on, and the power output terminal works normally. When the power supply encounters a surge voltage that causes the output voltage to overshoot or become abnormal, the high-power transistor Q2 is turned off, and the output current can only flow through the current-limiting resistor R5, which is a large resistor. Therefore, the current-limiting resistor R5 can limit the The output voltage and current of the power supply effectively suppress the surge voltage and current of the power supply.
该开关保护电路20包括：导通电阻R2和保护开关。The switch protection circuit 20 includes an on-resistance R2 and a protection switch.
导通电阻R2的第一端连接RC充电电路101的第三端和限压限流电路40的控制端，导通电阻R2的第二端连接保护开关的第三端，保护开关的第二端接地，保护开关的第一端连接电压监测电路30。The first terminal of the on-resistance R2 is connected to the third terminal of the RC charging circuit 101 and the control terminal of the voltage and current limiting circuit 40. The second terminal of the on-resistance R2 is connected to the third terminal of the protection switch and the second terminal of the protection switch. The first terminal of the protection switch is connected to the voltage monitoring circuit 30.
进一步地，该开关保护电路20还包括二极管D1和二极管D2。Further, the switch protection circuit 20 further includes a diode D1 and a diode D2.
二极管D1的阳极连接导通电阻R2的第一端，二极管D1的阴极连接导通电阻R2的第二端；二极管D2的阳极连接保护开关的第二端，二极管D2的阴极接地。The anode of the diode D1 is connected to the first end of the on-resistance R2, the cathode of the diode D1 is connected to the second end of the on-resistance R2; the anode of the diode D2 is connected to the second end of the protection switch, and the cathode of the diode D2 is grounded.
可选的，该保护开关可以为三极管Q1。其中，三极管Q1的基极为保护开关的第一端，三极管Q1的发射极为保护开关的第二端，三极管Q1的集电极为保护开关的第三端。当然，可以理解地，在其他一些实施例中，该保护开关也可以采用晶体管Q2。Optionally, the protection switch may be a transistor Q1. The base of transistor Q1 protects the first end of the switch, the emitter of transistor Q1 protects the second end of the switch, and the collector of transistor Q1 is the third end of the protection switch. Of course, it can be understood that in some other embodiments, the protection switch may also use the transistor Q2.
本发明实施例中，该电压监测电路30包括：第二稳压电路301和分压电路302。In the embodiment of the present invention, the voltage monitoring circuit 30 includes a second voltage stabilizing circuit 301 and a voltage dividing circuit 302.
第二稳压电路301的第一端连接电源的输出端，第二稳压电路301的第二端连接分压电路302的第一端，分压电路302的第二端接地，分压电路302的输出端连接开关保护电路20。The first end of the second voltage stabilization circuit 301 is connected to the output end of the power supply, the second end of the second voltage stabilization circuit 301 is connected to the first end of the voltage division circuit 302, the second end of the voltage division circuit 302 is grounded, and the voltage division circuit 302 The output terminal is connected to the switch protection circuit 20.
可选的，第二稳压电路301可由多个稳压管串联组成，分压电路302可由多个电阻组成，其中，多个电阻可以串联、并联、串并联等多个方式实现分压。如图2所示，在该实施例中，第二稳压电路301包括第一稳压管ZD1和第二稳压管ZD2。分压电路302包括第三分压电阻R3和第四分压电阻R4。Optionally, the second voltage stabilizing circuit 301 may be composed of a plurality of voltage stabilizing tubes in series, and the voltage dividing circuit 302 may be composed of a plurality of resistors. Among them, the plurality of resistors may implement voltage division in series, parallel, and series-parallel modes. As shown in FIG. 2, in this embodiment, the second voltage regulator circuit 301 includes a first voltage regulator ZD1 and a second voltage regulator ZD2. The voltage dividing circuit 302 includes a third voltage dividing resistor R3 and a fourth voltage dividing resistor R4.
具体的，第一稳压管ZD1的阴极连接电源的输出端，第一稳压管ZD1的阳极连接第二稳压管ZD2的阴极，第二稳压管ZD2的阳极连接第三分压电阻R3的第一端，第三分压电阻R3的第二端连接第四分压电阻R4的第一端，第四分压电阻R4的第二端接地，第三分压电阻R3的第二端和第四分压电的第一端的连接端还连接开关保护电路20（即如图2所示，连接三极管Q1的基极）。其中，第一稳压管ZD1的阴极为第二稳压电路301的第一端，第二稳压管ZD2的阳极为第二稳压电路301的第二端，第三分压电阻R3的第一端为分压电路302的第一端，第四分压电阻R4的第二端为分压电路302的第二端，第三分压电阻R3的第二端和第四分压电的第一端的连接端为分压电路302的输出端。Specifically, the cathode of the first Zener ZD1 is connected to the output end of the power supply, the anode of the first Zener ZD1 is connected to the cathode of the second Zener ZD2, and the anode of the second Zener ZD2 is connected to the third voltage dividing resistor R3 The first terminal of the third voltage dividing resistor R3 is connected to the first terminal of the fourth voltage dividing resistor R4, the second terminal of the fourth voltage dividing resistor R4 is grounded, and the second terminal of the third voltage dividing resistor R3 and The connection end of the first end of the fourth piezoelectric element is also connected to the switch protection circuit 20 (that is, as shown in FIG. 2, connected to the base of the transistor Q1). Among them, the cathode of the first Zener tube ZD1 is the first end of the second Zener circuit 301, the anode of the second Zener tube ZD2 is the second end of the Second Zener circuit 301, and the third One end is the first end of the voltage divider circuit 302, the second end of the fourth voltage divider resistor R4 is the second end of the voltage divider circuit 302, the second end of the third voltage divider resistor R3 and the fourth voltage divider A connection terminal at one end is an output terminal of the voltage dividing circuit 302.
如图2所示，当电源的输出电压正常时，输出电压经过电阻R1给电容C2充电，并由第三稳压管ZD3进行钳位，直到电容C2上的充电电压达到大功率晶体管Q2的开启电压后，大功率晶体管Q2正常导通，电源输出端正常输出电压，电源处于正常工作状态，此时，由于第一稳压管ZD1和第二稳压管ZD2的钳位作用，输出电压小于第一稳压管ZD1和第二稳压管ZD2的阈值电压之和，第一稳压管ZD1和第二稳压管ZD2截止，所以，三极管Q1的基极上没有可以使其导通的足够电压，三极管Q1处于截止状态。As shown in Figure 2, when the output voltage of the power supply is normal, the output voltage is charged to the capacitor C2 through the resistor R1 and clamped by the third voltage regulator ZD3 until the charging voltage on the capacitor C2 reaches the on of the high-power transistor Q2. After the voltage, the high-power transistor Q2 is normally turned on, the power output terminal normally outputs the voltage, and the power supply is in a normal working state. At this time, due to the clamping effect of the first Zener ZD1 and the second Zener ZD2, the output voltage is less than the first The sum of the threshold voltages of a Zener ZD1 and a Second Zener ZD2, the first Zener ZD1 and the second Zener ZD2 are turned off, so there is not enough voltage on the base of transistor Q1 to make it conductive , Transistor Q1 is in the off state.
当电源遭遇浪涌电压电流时，电源输出电压过冲，此时，第一稳压管ZD1和第二稳压管ZD2导通，第四分压电阻R4R4上形成电压，该电压可使三极管Q1导通，所以三极管Q1导通。由于三极管Q1的导通作用，将大功率晶体管Q2的栅极上的电压下接到地，大功率晶体管Q2关断，此时，输出电流只能从限流电阻R5上流过，而限流电阻R5为大电阻，因此，通过限流电阻R5可以限制电源的输出电压和电流，进而达到有效抑制电源浪涌电压电流的目的，有效保护电源和负载。可以理解地，当电源输出电压电流正常后，第一稳压管ZD1和第二稳压管ZD2又再次返回截止状态（不导通），三极管Q1关断，大功率晶体管Q2正常导通，电源恢复正常输出。When the power supply encounters a surge voltage and current, the output voltage of the power supply overshoots. At this time, the first voltage regulator ZD1 and the second voltage regulator ZD2 are turned on, and a voltage is formed on the fourth voltage dividing resistor R4R4. This voltage can make the transistor Q1 Is turned on, so transistor Q1 is turned on. Due to the conduction of the transistor Q1, the voltage on the gate of the high-power transistor Q2 is connected to ground, and the high-power transistor Q2 is turned off. At this time, the output current can only flow through the current-limiting resistor R5, and the current-limiting resistor R5 is a large resistor. Therefore, the current limiting resistor R5 can limit the output voltage and current of the power supply, thereby achieving the purpose of effectively suppressing the surge voltage and current of the power supply and effectively protecting the power supply and the load. Understandably, after the output voltage and current of the power supply are normal, the first Zener ZD1 and the second Zener ZD2 return to the off state again (non-conducting), the transistor Q1 is turned off, and the high-power transistor Q2 is normally turned on. Restore normal output.
本发明利用稳压管与晶体管Q2的导通与关断，去吸收电源开关机瞬间出现的异常浪涌电压电流，自动调整输出电压与输出电流，进而可以大大提高电源的可靠性。而且本发明实现这些功能十分简单可靠，使用的是全硬件控制方式，可靠性高，可完全抑制输出电压电流的浪涌与异常过冲。The invention utilizes the on and off of the voltage regulator tube and the transistor Q2 to absorb the abnormal surge voltage and current appearing instantaneously in the power switch, and automatically adjusts the output voltage and output current, thereby greatly improving the reliability of the power supply. In addition, the present invention is very simple and reliable to implement these functions. It uses a full hardware control method with high reliability and can completely suppress the surge and abnormal overshoot of the output voltage and current.
另外，本发明还提供了一种电源，该电源包括前述实施例的抑制电源浪涌电压电流的控制电路。其中，该电源包括但不限于LED驱动电源。本发明实施例中，LED驱动电源通过在内部设置上述抑制电源浪涌电压电流的控制电路可以有效抑制LED驱动电源在开关机瞬间出现的异常浪涌电压电流，自动调整LED驱动电源的输出电压与输出电流，大大提高LED驱动电源的可靠性，且采用全硬件的控制方式，可靠性高，可完全抑制LED驱动电源的输出电压和电流的浪涌与异常过冲，且还不会延长LED驱动电源的启动时间。In addition, the present invention also provides a power source, which includes the control circuit for suppressing the surge voltage and current of the power source in the foregoing embodiment. The power source includes, but is not limited to, an LED driving power source. In the embodiment of the present invention, the LED driving power supply can effectively suppress the abnormal surge voltage and current of the LED driving power supply at the moment of switching on and off by setting the control circuit for suppressing the power supply surge voltage and current inside, and automatically adjust the output voltage of the LED driving power supply and The output current greatly improves the reliability of the LED driving power supply, and adopts a full hardware control method with high reliability. It can completely suppress the output voltage and current surge and abnormal overshoot of the LED driving power supply, and it will not extend the LED driving. Power on time.
以上实施例只为说明本发明的技术构思及特点，其目的在于让熟悉此项技术的人士能够了解本发明的内容并据此实施，并不能限制本发明的保护范围。凡跟本发明权利要求范围所做的均等变化与修饰，均应属于本发明权利要求的涵盖范围。The above embodiments are only for explaining the technical concept and characteristics of the present invention, and the purpose thereof is to enable persons familiar with the technology to understand the content of the present invention and implement it accordingly, and should not limit the protection scope of the present invention. Any equivalent changes and modifications made to the scope of the claims of the present invention shall all fall within the scope of the claims of the present invention.
应当理解的是，对本领域普通技术人员来说，可以根据上述说明加以改进或变换，而所有这些改进和变换都应属于本发明所附权利要求的保护范围。It should be understood that those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes should fall within the protection scope of the appended claims of the present invention.

Claims (10)

  1. 一种抑制电源浪涌电压电流的控制电路，其特征在于，包括：A control circuit for suppressing surge voltage and current of a power supply is characterized in that it includes:
    与电源输出端、用于接收电源的输出电压并根据所述输出电压产生驱动信号的驱动电路；And a power output terminal, a driving circuit for receiving an output voltage of the power source and generating a driving signal according to the output voltage;
    与电源输出端、用于监测所述电源的输出电压并在所述电源产生浪涌电压时导通并输出导通信号的电压监测电路；A voltage monitoring circuit connected to a power output terminal for monitoring an output voltage of the power supply and conducting and outputting a conduction signal when the power supply generates a surge voltage;
    分别与所述驱动电路和所述电源的负输出端连接的限压限流电路；A voltage-limiting current-limiting circuit connected to the driving circuit and the negative output terminal of the power supply, respectively;
    分别与所述驱动电路、所述电压监测电路和所述限压限流电路连接的开关保护电路；Switch protection circuits respectively connected to the driving circuit, the voltage monitoring circuit and the voltage and current limiting circuit;
    在所述电源的输出电压正常时，所述限压限流电路根据所述驱动信号导通，以使所述电源输出端正常输出电压；在所述电源产生浪涌电压时，所述开关保护电路根据所述电压监测电路输出的导通信号导通，使所述限压限流电路限制电源的输出电压和输出电流。When the output voltage of the power supply is normal, the voltage-limiting and current-limiting circuit is turned on according to the driving signal, so that the output end of the power supply normally outputs voltage; when the power supply generates a surge voltage, the switch protects The circuit is turned on according to a conduction signal output by the voltage monitoring circuit, so that the voltage and current limiting circuit limits the output voltage and output current of the power supply.
  2. 根据权利要求1所述的抑制电源浪涌电压电流的控制电路，其特征在于，所述驱动电路包括：RC充电电路和第一稳压电路；The control circuit of claim 1, wherein the driving circuit comprises: an RC charging circuit and a first voltage stabilizing circuit;
    所述RC充电电路的第一端连接所述电源的输出端，所述RC充电电路的第二端接地，所述RC充电电路的第三端分别连接所述第一稳压电路的第一端、所述限压限流电路的控制端以及所述开关保护电路；所述第一稳压电路的第二端接地。A first terminal of the RC charging circuit is connected to an output terminal of the power source, a second terminal of the RC charging circuit is grounded, and a third terminal of the RC charging circuit is respectively connected to the first terminal of the first voltage stabilizing circuit. A control terminal of the voltage and current limiting circuit and the switch protection circuit; a second terminal of the first voltage stabilizing circuit is grounded.
  3. 根据权利要求2所述的抑制电源浪涌电压电流的控制电路，其特征在于，所述RC充电电路包括：电阻R1和电容C2；The control circuit for suppressing power surge voltage and current according to claim 2, wherein the RC charging circuit comprises: a resistor R1 and a capacitor C2;
    所述电阻R1的第一端连接所述电源的输出端，所述电阻R1的第二端连接所述电容C2的第一端，所述电容C2的第二端接地，所述电阻R1和所述电容C2的连接节点还分别连接所述第一稳压电路的第一端和所述限压限流电路的控制端；The first terminal of the resistor R1 is connected to the output terminal of the power supply, the second terminal of the resistor R1 is connected to the first terminal of the capacitor C2, and the second terminal of the capacitor C2 is grounded. The connection node of the capacitor C2 is also connected to the first terminal of the first voltage stabilization circuit and the control terminal of the voltage and current limiting circuit;
    所述电阻R1的第一端为所述RC充电电路的第一端，所述电容C2的第二端为所述RC充电电路的第二端，所述电阻R1和所述电容C2的连接节点为所述RC充电电路的第三端。A first end of the resistor R1 is a first end of the RC charging circuit, a second end of the capacitor C2 is a second end of the RC charging circuit, and a connection node between the resistor R1 and the capacitor C2 The third terminal of the RC charging circuit.
  4. 根据权利要求3所述的抑制电源浪涌电压电流的控制电路，其特征在于，所述第一稳压电路包括：第三稳压管；The control circuit of claim 3, wherein the first voltage stabilizing circuit comprises: a third voltage stabilizing tube;
    所述第三稳压管的阴极连接所述电阻R1和所述电容C2的连接节点，所述第三稳压管的阳极接地；A cathode of the third Zener tube is connected to a connection node between the resistor R1 and the capacitor C2, and an anode of the third Zener tube is grounded;
    所述第三稳压管的阴极为所述第一稳压电路的第一端，所述第三稳压管的阳极为所述第一稳压电路的第二端。The cathode of the third Zener tube is the first end of the first Zener tube, and the anode of the third Zener tube is the second end of the first Zener tube.
  5. 根据权利要求2所述的抑制电源浪涌电压电流的控制电路，其特征在于，所述限压限流电路包括：功率开关和限制电路；The control circuit for suppressing power surge voltage and current according to claim 2, wherein the voltage and current limiting circuit comprises: a power switch and a limiting circuit;
    所述功率开关的第一端连接所述RC充电电路的第三端，所述功率开关的第二端连接所述第一稳压电路的第二端，所述功率开关的第三端接地；所述限制电路并联在所述功率开关的第二端和第三端之间。A first end of the power switch is connected to a third end of the RC charging circuit, a second end of the power switch is connected to a second end of the first voltage stabilization circuit, and a third end of the power switch is grounded; The limiting circuit is connected in parallel between a second terminal and a third terminal of the power switch.
  6. 根据权利要求5所述的抑制电源浪涌电压电流的控制电路，其特征在于，所述功率开关包括晶体管；所述限制电路包括限流电阻；The control circuit for suppressing power surge voltage and current according to claim 5, wherein the power switch comprises a transistor; and the limiting circuit comprises a current limiting resistor;
    所述晶体管的栅极连接所述RC充电电路的第三端，所述晶体管的源极连接所述第一稳压电路的第二端，所述晶体管的漏极接地；所述限流电阻并联在所述晶体管的源极和漏极之间；The gate of the transistor is connected to the third end of the RC charging circuit, the source of the transistor is connected to the second end of the first voltage stabilization circuit, the drain of the transistor is grounded, and the current limiting resistor is connected in parallel. Between a source and a drain of the transistor;
    所述晶体管的栅极为所述功率开关的第一端，所述晶体管的源极为所述功率开关的第二端，所述晶体管的漏极为所述功率开关的第三端。The gate of the transistor is the first end of the power switch, the source of the transistor is the second end of the power switch, and the drain of the transistor is the third end of the power switch.
  7. 根据权利要求2所述的抑制电源浪涌电压电流的控制电路，其特征在于，所述开关保护电路包括：导通电阻和保护开关；The control circuit for suppressing power surge voltage and current according to claim 2, wherein the switch protection circuit comprises: an on-resistance and a protection switch;
    所述导通电阻的第一端连接RC充电电路的第三端和所述限压限流电路的控制端，所述导通电阻的第二端连接所述保护开关的第三端，所述保护开关的第二端接地，所述保护开关的第一端连接所述电压监测电路。A first terminal of the on-resistance is connected to a third terminal of the RC charging circuit and a control terminal of the voltage and current limiting circuit, and a second terminal of the on-resistance is connected to a third terminal of the protection switch. The second end of the protection switch is grounded, and the first end of the protection switch is connected to the voltage monitoring circuit.
  8. 根据权利要求7所述的抑制电源浪涌电压电流的控制电路，其特征在于，所述开关保护电路还包括二极管D1和二极管D2；The control circuit for suppressing power surge voltage and current according to claim 7, wherein the switch protection circuit further comprises a diode D1 and a diode D2;
    所述二极管D1的阳极连接所述导通电阻的第一端，所述二极管D1的阴极连接所述导通电阻的第二端；An anode of the diode D1 is connected to a first end of the on-resistance, and a cathode of the diode D1 is connected to a second end of the on-resistance;
    所述二极管D2的阳极连接所述保护开关的第二端，所述二极管D2的阴极接地。An anode of the diode D2 is connected to a second end of the protection switch, and a cathode of the diode D2 is grounded.
  9. 根据权利要求1所述的抑制电源浪涌电压电流的控制电路，其特征在于，所述电压监测电路包括：第二稳压电路和分压电路；The control circuit of claim 1, wherein the voltage monitoring circuit comprises a second voltage stabilizing circuit and a voltage dividing circuit;
    所述第二稳压电路的第一端连接所述电源的输出端，所述第二稳压电路的第二端连接所述分压电路的第一端，所述分压电路的第二端接地，所述分压电路的输出端连接所述开关保护电路。A first terminal of the second voltage stabilization circuit is connected to an output terminal of the power supply, a second terminal of the second voltage stabilization circuit is connected to a first terminal of the voltage division circuit, and a second terminal of the voltage division circuit The output terminal of the voltage dividing circuit is connected to the switch protection circuit.
  10. 一种电源，其特征在于，包括权利要求1-9任一项所述的抑制电源浪涌电压电流的控制电路。A power supply, comprising a control circuit for suppressing a surge voltage and current of a power supply according to any one of claims 1-9.
PCT/CN2019/080573 2018-09-28 2019-03-29 Control circuit for suppressing surge voltage and current of power supply, and power supply WO2020062817A1 (en)

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CN114336517A (en) * 2021-12-30 2022-04-12 赛尔富电子有限公司 Overvoltage self-locking protection circuit and power supply

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CN114336517B (en) * 2021-12-30 2023-12-22 赛尔富电子有限公司 Overvoltage self-locking protection circuit and power supply

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