WO2010124413A1 - Circuit de protection contre les surtensions cycle par cycle pour alimentation électrique à découpage - Google Patents

Circuit de protection contre les surtensions cycle par cycle pour alimentation électrique à découpage Download PDF

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Publication number
WO2010124413A1
WO2010124413A1 PCT/CN2009/000456 CN2009000456W WO2010124413A1 WO 2010124413 A1 WO2010124413 A1 WO 2010124413A1 CN 2009000456 W CN2009000456 W CN 2009000456W WO 2010124413 A1 WO2010124413 A1 WO 2010124413A1
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WO
WIPO (PCT)
Prior art keywords
diode
resistor
thyristor
cathode
overvoltage protection
Prior art date
Application number
PCT/CN2009/000456
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English (en)
Chinese (zh)
Inventor
卢东方
符平凡
Original Assignee
Lu Dongfang
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 Lu Dongfang filed Critical Lu Dongfang
Priority to JP2011552296A priority Critical patent/JP5330548B2/ja
Priority to PCT/CN2009/000456 priority patent/WO2010124413A1/fr
Priority to KR1020107024958A priority patent/KR101171739B1/ko
Publication of WO2010124413A1 publication Critical patent/WO2010124413A1/fr

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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
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers

Definitions

  • the present invention relates to an overvoltage protection technique, and more particularly to a switching power supply input overvoltage protection circuit. Background technique
  • Method 1 The positive temperature coefficient fuse PTCC and the metal oxide varistor M0V are jointly protected. As shown in Fig.
  • Method 2 is a modified version of Method 1. The Zener is used instead of the varistor.
  • the Zener overcomes the shortcomings of the varistor, has a very fast response time, and has a long service life.
  • the consistency of the bit voltage is high.
  • the Zener diode is broken down, the impedance of the Zener diode is immediately reduced, and the voltage is clamped in the Zener diode.
  • the clamp voltage On the clamp voltage, a large current loop is formed, and the PPTC is converted into a high-resistance state due to rapid heat generation by passing a large current. Description
  • Method 3 Using thyristor overvoltage protection method, as shown in Figure 3, when the AC input voltage rises to the set voltage of the protection circuit (change the Rl, R2 resistance value can change the set voltage), the trigger diode DS is turned on, The thyristor is turned on, the current passes through the PPTC, the thyristor current limiting resistor R3, and the thyristor form a large current loop.
  • the PPTC is converted into a high-resistance state due to rapid heating by a large current, and the current through the line is very limited, and the protection power source is reached.
  • the purpose of the post-stage circuit is that once the protection of the PPTC is started, the power must be cut off, and the PPTC can be cooled after returning to the low-resistance state.
  • Method 4 Using the thyristor voltage limiting protection method, as shown in Figure 4, the principle is: The control circuit controls the conduction time of the thyristor by comparing and calculating the circuit according to the magnitude of the AC input voltage, and outputting an appropriate delay trigger pulse. The voltage of the circuit of the switching power supply does not exceed the maximum operating voltage.
  • Method 5 Using relay overvoltage protection method, when the AC input voltage rises, the rectified DC voltage also rises. When the DC voltage is higher than the clamp voltage of the Zener diode, the Zener diode breaks down, and the transistor Q1 Conduction, relay action, normally closed electric shock, cut off the power line of the rear stage, and achieve the purpose of input overvoltage protection.
  • this method is simple and reliable, its disadvantage is that in the case of large voltage fluctuations, the relay frequently operates, which has an impact on the continuous and stable power supply of the power supply. Since the protection circuit is added with a relay, it is necessary to provide a power supply for the relay to work, which is troublesome. It is bulky and difficult to use in low-power switching power supplies. Summary of the invention
  • the invention mainly solves the problems existing in the prior art mentioned above, and provides a principle of using a thyristor AC chopping circuit to directly sample a grid voltage and automatically change the thyristor according to the magnitude of the AC input voltage.
  • the on-time power switch overvoltage protection circuit The above technical problem of the present invention is mainly solved by the following technical solutions:
  • a switching power supply per-cycle overvoltage protection circuit characterized in that: an overvoltage protection circuit 1 is connected between the AC input and the load, the overvoltage
  • the protection circuit includes a thyristor, a Zener diode, a first resistor, a second resistor, a second diode and a second capacitor.
  • the anode of the thyristor is connected to the AC input terminal, and the cathode is connected to the load terminal.
  • the cathode is connected to the gate of the thyristor, and the anode of the Zener diode is respectively connected to the first resistor and the second resistor which are connected in parallel with each other, the first resistor is directly connected to the AC input terminal, and the second resistor is connected to the Zener diode through the connection Set of second diode books
  • the second capacitor After being connected to the AC input terminal, the second capacitor is connected between the thyristor cathode and the Zener diode; a first capacitor is connected between the load input terminal and the load ground terminal.
  • a first diode connected in the same direction as the thyristor is disposed between the thyristor cathode and the load terminal.
  • a third resistor is connected between the first diode anode and the common ground terminal.
  • the third diode further includes a cathode of the third diode connected in series with the third resistor, a cathode connected to the third resistor, and an anode connected to the common ground.
  • an overvoltage protection circuit 2 is connected between the AC input and the load, and the single-phase overvoltage protection circuit 2 includes a thyristor, a Zener diode, a first resistor, a second resistor, and a second resistor.
  • a three-resistor a first diode, a second diode, a third diode, and a second capacitor
  • the anode of the thyristor is connected to the common ground end, and the cathode thereof is connected to the first two poles connected in series with the thyristor
  • the tube is connected to the load end, the anode of the Zener tube is connected to the gate of the thyristor, and the cathode of the Zener tube is respectively connected to the first resistor and the second resistor connected in parallel with each other, and the first resistor is directly connected to the common ground end
  • the second capacitor Connecting a second diode disposed in the same direction as the Zener diode and connecting to the common ground terminal, the second capacitor is connected between the cathode of the thyristor and the anode of the Zener diode, and the third resistor is arranged in series with the third diode in the first Between the anode of the diode and the input of the alternating current, the cathode of the third diode is connected to the third diode, and the anode thereof is connected to the alternating current input.
  • an overvoltage protection circuit 3 is connected between the AC input terminal and the load ground terminal, and the overvoltage protection circuit 3 includes a thyristor, a Zener diode, a first resistor, a second resistor, and a second a capacitor and a second diode, the anode of the thyristor is connected to the ground end of the load, the cathode is connected to the AC input end, the cathode of the Zener tube is connected to the gate of the thyristor, and the anode of the Zener tube is respectively connected to the parallel connection
  • the first resistor is directly connected to the load ground
  • the second resistor is connected to the load ground by connecting a second diode opposite to the Zener diode
  • the second capacitor is connected to the cathode of the thyristor Between the Zener and the Zener.
  • a third diode is disposed in the overvoltage protection circuit, the diode anode is connected to the common ground end, and the cathode is connected to the load end.
  • a third diode is further disposed, the third diode is connected to the common ground end and the load ground end, and the anode of the third diode is connected to the first capacitor cathode.
  • the cathode of the third diode is in communication with the third diode anode of the overvoltage protection circuit.
  • the invention utilizes the principle of thyristor AC chopping, directly samples the grid voltage, automatically changes the conduction time of the thyristor according to the magnitude of the AC input voltage, and achieves the cycle-by-cycle control of the AC input power source, thereby avoiding the disadvantage of slow response time. It can automatically and instantly correct the fluctuation of the grid voltage, thus achieving over-voltage protection for the power line of the latter stage.
  • Figure 1 is a first circuit diagram of the prior art
  • Figure 2 is a second circuit diagram of the prior art
  • Figure 3 is a third circuit diagram of the prior art
  • Figure 4 is a fourth circuit diagram of the prior art
  • Figure 5 is a fifth circuit diagram of the prior art
  • Figure 6 is a basic circuit diagram of single-phase half-wave overvoltage protection according to the present invention.
  • Figure 7 is a schematic diagram of a single-phase half-wave overvoltage protection extended circuit of the present invention.
  • Figure 8 is a basic circuit diagram of single-phase full-wave overvoltage protection according to the present invention.
  • Figure 9 is a schematic diagram of a single-phase full-wave overvoltage protection extended circuit of the present invention.
  • Figure 10 is a schematic diagram of a waveform of a single-phase half-wave overvoltage protection basic circuit
  • Figure 11 is a schematic diagram showing the voltage waveform of the point A of the single-phase half-wave overvoltage protection basic line. detailed description
  • the single-phase half-wave overvoltage protection basic circuit shown in FIG. 6 it is disposed between the AC input and the load, and is composed of an overvoltage protection circuit-1 and a diode D1, a resistor R3, and a capacitor C1; the single-phase half-wave pass
  • the structure of the voltage protection basic circuit is: comprising a crystal SCR, the anode of the thyristor SCR is connected to the AC input end, and the cathode is connected to the load end by connecting the diode D1 disposed in the same direction as the thyristor SCR, and further comprises a voltage regulator.
  • the TVS is connected to the gate of the thyristor SCR, and the anode of the Zener diode TVS is respectively connected to the resistor R1 and the resistor R2 which are connected in parallel with each other.
  • the resistor R1 is directly connected to the AC input terminal, and the resistor R2 is connected through
  • the Zener diode TVS is reversely set with the diode D2 and the AC input Connected to the input terminal, a capacitor C2 is connected between the thyristor SCR cathode and the Zener diode TVS cathode, and a resistor R3 is also provided.
  • the resistor R3 is disposed between the anode of the diode D1 and the AC input terminal, between the load input end and the load ground end.
  • a capacitor Cl is connected.
  • the thyristor SCR, the diode D1, and the capacitor C1 constitute a current output main circuit;
  • the resistor R1, the TVS voltage regulator, the capacitor C2, and the resistor R3 constitute a control loop 1 for generating a thyristor trigger pulse;
  • the Zener diode, the capacitor C2, and the resistor R3 constitute a control loop 2 for generating a thyristor trigger pulse.
  • the working principle of this circuit is as follows: When the AC input is in the initial stage of the positive half cycle, the pulse-trigger end A of the thyristor SCR is low-voltage book.
  • the voltage at point A is as shown in Fig. 11, the thyristor SCR is turned off, at which time the C voltage is higher than point B, the diode D1 is in the reverse-off state, and the storage capacitor C1 is not discharged in the opposite direction to the input circuit;
  • the voltage gradually rises, and the current is positively charged to the capacitor C2 through the control loop one, that is, the resistor R1, the TVS voltage regulator, and the resistor R3.
  • the voltage regulator TVS is in the forward conduction state, and the voltage gradually increases with the positive half cycle of the AC input. Ascending, the voltage at point A also gradually rises.
  • the thyristor SCR When the voltage at point A exceeds the gate trigger voltage V SCR of the thyristor, the thyristor SCR is turned on, the capacitor C2 is charged, and the forward charging time for the capacitor C2 is called T C2+ (eg Figure 10); After the thyristor SCR is turned on, the voltage at point B gradually rises. When the voltage at point B exceeds the voltage at point C V C1 (voltage at voltage C1) +0. 7V (forward voltage drop of diode D1), D1 On, the current is charged to the capacitor C1 through the main circuit, and the voltage at point C is gradually increased. As the voltage in the positive half cycle gradually decreases, the voltage at point B also gradually decreases.
  • T C1 The charging time of the capacitor C1 is referred to as T C1 (FIG. 10); due to the large resistance of resistor R3, the current flowing through the thyristor SCR is less than the holding current of the thyristor, the thyristor SCR is turned off, the output of the main circuit current is cut off, the thyristor The on-time of the SCR is called! ⁇ (as shown in Figure 10). At this time, the current flowing through the thyristor SCR is greater than its holding current, and the SCR is turned on, but with the loss Description
  • the thyristor SCR When the input voltage is reduced to zero, the thyristor SCR will also turn off by itself, cutting off the current output main circuit.
  • the charging time T C1 of the capacitor C1 is proportional to the on-time of the thyristor SCR, the longer the on-time T SCR of the thyristor SCR is, the higher the voltage V C1 on the capacitor C1 is; the conduction of the thyristor SCR is controlled by the gate.
  • the gate reaches the trigger voltage V OT , the thyristor SCR is turned on.
  • the longer the time T C2+ of the voltage at point A reaches V sca the smaller the on-time T sai of the thyristor SCR is, and the lower the voltage on the storage capacitor C1 is.
  • the voltage on the capacitor C1 can be within the safe use range, thereby achieving the purpose of protecting the load circuit.
  • this must be based on the assumption that the AC input voltage is stable. If the AC input voltage suddenly rises, the charging current in the control loop 1 increases accordingly.
  • the time T C2+ reaches the gate trigger voltage V SCR is shortened, and the thyristor SCR conduction time is extended. , the charging time T C1 on the capacitor C1 is prolonged, and the voltage on the capacitor C1 is also increased accordingly, so it is also necessary to cooperate with the control loop 2 to solve the charging time on the pair of capacitors C1 of the control loop! ⁇ Control.
  • the diode D2 in the control circuit 2 is reversely turned off, and the control circuit 2 does not function.
  • the Zener diode TVS is not conducting and is high due to the small negative voltage. In the impedance state, there is only a small leakage current in the control loop, which has little effect on the voltage at point A, and the voltage at point A is basically unchanged.
  • the negative voltage increases, when the negative voltage exceeds the clamp voltage V TVS of the Zener diode TVS, the impedance of the Zener diode TVS decreases immediately, and the voltage is clamped to the clamp voltage of the Zener diode TVS.
  • a reverse charging circuit is formed for the capacitor C2, so that the voltage at the point A has a positive pressure and the negative voltage at the point A is called V C2 ⁇ , and the charging time for the C2 is called T (as shown in the figure). 10)). If the AC input voltage increases (AC input negative pressure increases), the reverse charging current increases and the reverse charging time T C2 of the capacitor C2 increases due to the breakdown time of the TVS tube of the Zener tube; C2 is charged The increase in time and the increase in charging current cause A to form a higher negative pressure V e2 -. The magnitude of the negative voltage V C2 - formed at point A affects the positive charging time of capacitor C2 in the positive half cycle of the AC input. The higher the negative voltage V ra - of point A, Instruction manual
  • the AC input negative voltage is reduced, the reverse charging current is decreased, and the reverse charging time I of the capacitor C2 is shortened due to the delay of the breakdown time of the Zener diode TVS, and the capacitor C2 is shortened due to the charging time and the charging current is reduced.
  • the point A forms a lower negative voltage V ra —
  • the time for the capacitor C2 to reach the thyristor SCR triggering the turn-on threshold voltage ⁇ ⁇ at the forward charging time is shortened, thereby increasing the charging time ⁇ of the capacitor C1 , the capacitor C1
  • the voltage T ei also rises, thereby ensuring that the voltage across the capacitor C1 is stable.
  • the voltage values of the positive and negative half cycles of the AC input voltage are equal. Since the resistor R1 in the control loop 1 still functions during the negative half cycle of the AC input, the reverse charging current to the capacitor C2 is greater than that in the AC. Input the positive charging current of capacitor C2 in the positive half cycle, and select the component parameters in circuit one and circuit two properly.
  • the AC input voltage exceeds the specified safety voltage (such as greater than 320AC)
  • the voltage at point A is at the AC input.
  • the thyristor threshold voltage can be reached, the thyristor cannot be turned on, and the power input loop is cut off, thereby protecting the safety of the load.
  • Control loop one loop two pairs of AC input power supply to achieve each wave of control, automatic chopping voltage limit, for sudden boost, up to a positive half cycle, and only one positive half cycle voltage, capacitor C1 and load often It is completely capable of being digested without damaging the circuit components, thus completely ensuring the safety of the load.
  • a single-phase half-wave overvoltage protection extension line is provided, which is basically the same as the single-phase half-wave overvoltage protection basic circuit structure in Embodiment 1, but further includes a diode D3.
  • the cathode of the diode D3 is connected in series with the resistor R3, and the cathode thereof is connected to the resistor R3, and the anode and the common ground end Description
  • the circuit when the AC input positive half cycle is in the initial stage, the circuit only starts to charge the capacitor C2 positively when the input positive half cycle voltage is greater than the voltage on the capacitor C1, delaying the capacitance.
  • C2 forward charging time that is, shortening the conduction time of the thyristor SCR, reducing the charging time of the capacitor C1, the voltage of the capacitor C1 is reduced, thereby protecting the load; the resistor R3 is blocked by the reverse of the diode D3 It does not work; in the negative half cycle of the AC input, the diode D3 is in the forward state, and the reverse charging of the capacitor C2 in the loop 2 is the same as in the first embodiment.
  • the present invention also provides a single-phase full-wave overvoltage protection basic circuit.
  • the circuit structure is connected with an overvoltage protection circuit 2 between the AC input and the load on the line of the embodiment 2.
  • the single-phase overvoltage protection circuit 2 includes a thyristor SCR.1 and a Zener diode TVS.1.
  • the resistor Rl.l, the resistor R2.1, the resistor R3.1, the diode Dl.l, the diode D2.1, the diode D3.1 and the capacitor C2.1, the anode of the thyristor SCR.1 is connected to the common ground end,
  • the cathode is connected to the load terminal through a diode D1.1 connected in series with the thyristor SCR.1, and the anode of the Zener diode TVS.1 is connected to the gate of the thyristor SCR.1, and the cathode of the Zener diode TVS.1 is respectively Connected to the resistor R1.1 and the resistor R2.1 connected in parallel with each other, the resistor R1.1 is directly connected to the common ground terminal, and the resistor R2.1 is connected to the diode D2.1 disposed in the same direction as the Zener diode TVS.1.
  • the common ground is connected, the capacitor C2.1 is connected between the thyristor SCR.1 cathode and the Zener diode TVS.1 anode, and the resistor R3.1 is connected in series with the diode D3.1 between the anode of the diode D1.1 and the AC input terminal.
  • the cathode of the diode D3.1 is connected to the diode D3.1, and the anode thereof is connected to the alternating current input terminal.
  • the working principle is the same as that of Embodiment 1. In Embodiments 1 and 2, the capacitor C1 is charged only during the positive half cycle of the AC input, and the capacitor C1 cannot be charged during the negative half cycle of the AC input.
  • the present invention also provides a single-phase full-wave overvoltage protection extension circuit.
  • the circuit includes an overvoltage protection circuit-1, and an overvoltage protection circuit 3 is connected between the AC input terminal and the load ground terminal.
  • the overvoltage protection circuit 3 includes a thyristor SCR.1, a Zener diode TVS.1, and a resistor. Rl.l, resistor R2.1, capacitor C2.1 and diode D2.1, the anode of the thyristor SCR.1 is connected to the load ground, and the cathode is connected to the AC input terminal.
  • the Zener and the thyristor of the Zener diode TVS.1 The gates of SCR.1 are connected, and the anodes of the Zener diodes TVS.1 are respectively connected to the resistors R1.1 and R2.1 which are connected in parallel with each other.
  • the resistor R1.1 is directly connected to the ground of the load, and the resistor R2.1 passes. Connect the diode D2.1 opposite to the Zener diode and the load ground
  • capacitor C2.1 is connected between the thyristor SCR.1 cathode and the Zener diode TVS.1 cathode.
  • a diode D3.1 is further disposed, the anode of the diode D3.1 is connected to the common ground end, the cathode is connected to the load end, and a diode D3 is further disposed, and the diode D3 is connected at a common ground end.
  • the anode of the diode D3 is in communication with the cathode of the capacitor C1
  • the cathode of the diode D3 is connected to the anode of the diode D3.1 in the overvoltage protection circuit 1.
  • the circuit Compared with the single-phase full-wave overvoltage protection basic circuit in the third embodiment, the circuit utilizes the symmetry of the positive and negative half cycles of the AC input power source, and reduces the resistance R3, the resistance R3.1, the diode D1, and the diode D1.1. The component also achieves the function of the single-phase full-wave overvoltage protection basic circuit, which simplifies the circuit and reduces the cost.
  • the specific embodiments described herein are merely illustrative of the spirit of the invention. A person skilled in the art can make various modifications or additions to the specific embodiments described, or in a similar manner, without departing from the spirit of the invention or as defined by the appended claims. The scope. Although the terms of the thyristor SCR, the voltage regulator TVS, the resistor R1, the capacitor Cl, the diode D1, etc. are used in this article, the possibility of using other terms is not excluded. Use these terms just to be more square Description

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  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)

Abstract

L'invention porte sur un circuit de protection contre les surtensions cycle par cycle (1) pour alimentation à découpage qui comprend un thyristor (SCR), une diode Zener (TVS), une première résistance (R1), une seconde résistance (R2), une seconde diode (D2) et un second condensateur (C2). L'anode du thyristor (SCR) est connectée à une borne d'entrée de courant alternatif (ACIT) et la cathode du thyristor (SCR) est connectée à une borne de charge (LDT). La cathode de la diode Zener (TVS) est connectée à la grille du thyristor (SCR) et l'anode de la diode Zener (TVS) est connectée à la première résistance (R1) et la seconde résistance (R2) connectées l'une à l'autre en parallèle. La première résistance (R1) est directement connectée à la borne d'entrée de courant alternatif (ACIT) et la seconde résistance est connectée à la borne d'entrée de courant alternatif (ACIT) par l'intermédiaire de la seconde diode (D2) dont le sens de connexion est opposé à celui de la diode Zener (TVS). Le second condensateur (C2) est connecté entre la cathode du thyristor (SCR) et la cathode de la diode Zener (TVS). Un premier condensateur (C1) est connecté entre la borne de charge (LDT) et une borne de masse de charge (LDGT).
PCT/CN2009/000456 2009-04-28 2009-04-28 Circuit de protection contre les surtensions cycle par cycle pour alimentation électrique à découpage WO2010124413A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2011552296A JP5330548B2 (ja) 2009-04-28 2009-04-28 スイッチ電源サイクル毎の過電圧保護回路
PCT/CN2009/000456 WO2010124413A1 (fr) 2009-04-28 2009-04-28 Circuit de protection contre les surtensions cycle par cycle pour alimentation électrique à découpage
KR1020107024958A KR101171739B1 (ko) 2009-04-28 2009-04-28 스위치 전원 주파 과전압 보호회로

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Application Number Priority Date Filing Date Title
PCT/CN2009/000456 WO2010124413A1 (fr) 2009-04-28 2009-04-28 Circuit de protection contre les surtensions cycle par cycle pour alimentation électrique à découpage

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KR (1) KR101171739B1 (fr)
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CN110474291A (zh) * 2019-09-20 2019-11-19 国网天津市电力公司 一种配网自动化设备电源过压保护装置

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US4689713A (en) * 1985-06-12 1987-08-25 Les Cables De Lyon High voltage surge protection for electrical power line
DE3640661A1 (de) * 1986-11-28 1988-06-09 Siemens Ag Schaltungsanordnung zum ueberspannungsschutz eines thyristors in blockierrichtung
CN2146771Y (zh) * 1992-11-16 1993-11-17 蔡礼君 电磁铁、接触器的节能防烧器
CN101552451A (zh) * 2008-12-30 2009-10-07 卢东方 开关电源逐周波过压保护电路
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KR101226553B1 (ko) * 2010-11-15 2013-01-25 허세경 발광다이오드 램프
US8659241B2 (en) 2010-11-15 2014-02-25 Sea-Kyoung HUH LED lamp
CN110474291A (zh) * 2019-09-20 2019-11-19 国网天津市电力公司 一种配网自动化设备电源过压保护装置

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