CN205248776U - Switch power supply protection control circuit - Google Patents
Switch power supply protection control circuit Download PDFInfo
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- CN205248776U CN205248776U CN201520921651.4U CN201520921651U CN205248776U CN 205248776 U CN205248776 U CN 205248776U CN 201520921651 U CN201520921651 U CN 201520921651U CN 205248776 U CN205248776 U CN 205248776U
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- power supply
- voltage
- circuit
- switching power
- control circuit
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Abstract
The utility model discloses a switch power supply protection control circuit, the main power circuit's through detecting switching power supply operating condition adjusts auxiliary electrical power source voltage, when the circuit gets into the guard mode, below auxiliary electrical power source loss of voltage to the main control circuit coremaking piece shutoff voltage with switching power supply, the utility model discloses can solve the phenomenon of locking of switching power supply control chip appearance when quiting the protection, the current switching power supply of effectual solution simultaneously unstable phenomenon of auxiliary electrical power source voltage when enterring the guard mode, the loss of solving too high auxiliary electrical power source voltage generation in protection process, the transient state that the current switching power supply of solution hiccup the style protection is unusual, improves the reliability of overall product design.
Description
Technical field
The utility model relates to Switching Power Supply protection control circuit, and particularly the accessory power supply of Switching Power Supply occurs in Switching Power SupplyOvervoltage protection, under-voltage protection, short-circuit protection, the control circuit when protection such as overheat protector.
Background technology
Along with the development of power electronics industry, the Switching Power Supply that traditional linear power supply is had switching characteristic gradually substitutes, and opensIt is high that pass power supply has efficiency, high reliability. Through years development, there is different circuit topologies in Switching Power Supply, itsComprise forward topology, flyback topology etc., and the push-pull topology, the bridge type topology etc. that are developed out by forward topology, differentTopology has advantage separately. Along with the development of Switching Power Supply, modern Switching Power Supply is also come the requirement of reliability simultaneouslyHigher, existing Switching Power Supply generally all has under-voltage protection, overvoltage protection, short-circuit protection, overload protection and overheat protector etc.Function. The realization of these defencive functions, all needs accessory power supply power supply circuits to provide voltage VCC for it, existing accessory power supplyPower supply circuits are as shown in Figure 1: comprise start-up circuit and auxiliary power supply capacitor C 1, wherein start-up circuit comprise the first resistance R 1,The second resistance R 2, the first voltage-stabiliser tube Z1, the first triode TR1 and the first diode D1; Input VIN is successively through firstAfter the negative electrode of resistance R 1, the first voltage-stabiliser tube Z1, the anode of the first voltage-stabiliser tube Z1, be connected with ground; Also warp successively of input VINThe colelctor electrode of the second resistance R 2, the first triode TR1, the emitter stage of the first triode TR1, the sun of the first diode D1After the negative electrode of the utmost point, the first diode D1 to output VCC; The base stage of the first triode TR1 is connected to the first voltage-stabiliser tube Z1Anode; Auxiliary power supply capacitor C 1 be connected in and output VCC between.
Along with Switching Power Supply industry development has also engendered some digital control Switching Power Supplies, be characterized in by numeral in recent yearsChip, utilizes software to realize control and management to power supply, but current modular power source still carries out electricity based on analog chip mostlySource control and management, particularly for lower-powered modular power source, if use digit chip control, its development cost and lifeProduce cost higher, most manufacturer also cannot accept.
For the Switching Power Supply that adopts the design of simulation control chip, its internal circuit is all analog circuit, and some functions can not look like numberWord chip controls is like that very accurately with controlled. Switching Power Supply about the reliability that how to improve analog switched power supply product alwaysThe problem that developer is concerned about very much, the reliability of particularly how improving Switching Power Supply protection and protecting, is all Switching Power SupplyThe key issue of exploitation.
The current protection about Switching Power Supply, as under-voltage protection, overvoltage protection, some protections such as overcurrent protection, great majority exploitationThe protected mode that person selects is all the formula protected mode of having the hiccups, and this protected mode implementation is: when module enters after protected mode,Master control chip turn-offs output drive signal, and power module turn-offs output, and the built-in accessory power supply of Switching Power Supply quits work, auxiliarySupply voltage starts to decline, and when accessory power supply voltage drop is during to start-up circuit operating voltage, start-up circuit work also remains auxiliarySupply voltage steady operation, this burning voltage is greater than the operating voltage of chip, and after t after a while, (this time, t was by controlling coreSheet is inner to be determined), chip restarts, and whether testing circuit also in abnormality, if keep abnormality, master controlCoremaking sheet continues to turn-off driving, enters guard mode, if guard mode disappears, chip continues to start and normally work. Have the hiccupsThe following risks of the general existence of formula protected mode: under in overvoltage protection mode, in the situation that input voltage is higher, ifProduct work may damage power device, causes product failure. Under short-circuit protection pattern, as the hiccup protections mould of fruit chipThe time of the having the hiccups t of formula design is unreasonable, may occur that Partial Power device heating causes component failure extremely, causes that product is differentOften. In addition because the formula protected mode of having the hiccups requires the starting resistor of accessory power supply voltage higher than control chip all the time, on the one hand can be byIn too high accessory power supply voltage, in circuit, produce compared with lossy electric current, and this electric current is to be provided by start-up circuit, so meetingOn start-up circuit, produce very large loss, for example the normal supply voltage of the accessory power supply of a Switching Power Supply built-in module is22V, when entering after protected mode, the supply voltage of start-up circuit is minimum is 18V, and now the equiva lent impedance in circuit is approximateEqual 2000 ohm, so now circuit will produce the loss current of 9 milliamperes, and this part electric current is provided by start-up circuit, vacationIf the operating voltage range of product is 200 volts to 600 volts, start-up circuit 200 volts of whens input by the power consumption that produces 1.8 watts,In the time of 600 volts of inputs, by the power consumption that produces 5.4 watts, in order to ensure product safety reliably working, start-up circuit need to be stopped ratioLarger design margin, guarantee product is normally worked. The special power supply for existing photovoltaic application, its input voltage modelEnclose for 200-1500 volt, the power consumption of the start-up circuit of its high-pressure side will reach 7.5 times of low-pressure end power consumption.
The general external protected mode of existing Switching Power Supply is all to detect by outer circuits, in the time of circuit abnormality, by controlCircuit processed drags down some function pin position of control chip, and Switching Power Supply is the feedback pin FB by dragging down control chip mostly at presentOr Comp pin, after testing circuit detects that circuit recovers normally, control circuit is release guard function, chip is drawnLow function pin FB pin or Comp pin discharge, and it is normal that circuit recovers, but in fact often occur following anomaly:Describe as an example of this control chip of SF1565 example below, occur that as overvoltage protection testing circuit detects main circuit overvoltage is existingResemble, overvoltage crowbar startup feedback control signal drag down the FB pin of Master control chip SF1565, chip SF1565Turn-off driver output, module is also turn-offed output simultaneously, and accessory power supply voltage starts to decline, and in the time dropping to start-up circuit voltage, opensMoving circuit is started working and is provided power supply for system. After over-voltage detection circuit detects that overvoltage phenomenon disappears, turn-off overvoltage and protectProtect, FB pin discharges, and because module output voltage is zero, and now control chip SF1565 power supply is normal, and FB pin dischargesAfter, occur that FB pin is the phenomenon of high level, and this phenomenon is judged to be circuit open loop according to chip SF1565 logic built, coreThere is deadlock phenomenon in sheet, only has system cut-off, and control chip SF1565 supply voltage just can restart after lower than shutoff voltage.Because most protection of present stage is all to drag down the FB pin of chip or Comp pin, and dragging down rear chip, this pin can produce in addition1.6 milliamperes of above power consumptions, cause on the one hand chip to produce power consumption and cause heating, also bring loss to start-up circuit on the other hand.
Utility model content
The technical problems to be solved in the utility model is: a kind of Switching Power Supply protection control circuit is provided, realizes Switching Power Supply and exitWhen protection, chip, in restarting state, effectively solves chip lock dead, and reduces accessory power supply voltage, thereby effectively fallsThe loss of low system in protection process, eliminates the formula protected mode of having the hiccups, and improves the reliability of product.
The technical scheme that the utility model solves the problems of the technologies described above is as follows:
A kind of Switching Power Supply protection control circuit, comprises start-up circuit, auxiliary power supply electric capacity, protection testing circuit, boost voltageControl circuit and control chip;
When described start-up circuit enters guard mode for Switching Power Supply start-up course and Switching Power Supply, power, it comprises firstSwitching tube;
The energy that described auxiliary power supply electric capacity provides for storing described start-up circuit is described control chip and describedProtection testing circuit provides energy, and its one end is connected with described start-up circuit output, and the other end is connected to ground;
Auxiliary power supply voltage when described boost voltage control circuit enters guard mode for controlling described Switching Power Supply, bagDraw together second switch pipe and the second voltage-stabiliser tube, described second switch pipe is used for controlling the turn-on and turn-off of the second described voltage-stabiliser tube,The control end of described boost voltage control circuit is connected with described protection testing circuit, and described boost voltage control circuit is defeatedGo out end and be connected to described ground, described boost voltage control circuit in the time that described Switching Power Supply enters guard mode in open-mindedState, described boost voltage control circuit in the time that Switching Power Supply is normally worked in off state;
The duty of described protection testing circuit sense switch power supply, controls described second switch pipe turn-on and turn-off, fromAnd control described accessory power supply voltage, in the time that described duty enters guard mode, accessory power supply voltage is adjusted to controlBelow chip shutoff voltage;
And the accessory power supply voltage described in when described Switching Power Supply is normally worked is higher than the operating voltage of described control chip.
Preferably, described boost voltage control circuit and described auxiliary power supply Capacitance parallel connection, or be connected in describedBetween the control end of one switching tube.
Preferably, the first described switching tube is triode, MOSFET pipe or IGBT.
Preferably, described second switch pipe is triode, MOSFET pipe, 431 chips or IGBT.
Preferably, described start-up circuit also comprises the first resistance, the second resistance, the first voltage-stabiliser tube and the second diode; DescribedThe first switching tube be triode; Input VIN is successively through the negative electrode of the first resistance, the first voltage-stabiliser tube, the sun of the first voltage-stabiliser tubeExtremely, be connected with ground; Input VIN also successively through the emitter stage of the colelctor electrode of the second resistance, the first switching tube, the first switching tube,After the anode of the first diode, the negative electrode of the first diode to output VCC; The base stage of the first switching tube is connected to the first voltage stabilizingThe anode of pipe.
Preferably, the second switch pipe of described boost voltage control circuit is triode; The negative electrode of the second described voltage-stabiliser tube withThe negative electrode of the first described diode is connected, and the anode of the second described voltage-stabiliser tube is connected with the colelctor electrode of the second described triode,The emitter stage of the second described triode is connected with described ground, the base stage of the second described triode and described control chip andThe system of described protection testing circuit composition connects.
Preferably, the second switch pipe of described boost voltage control circuit is triode; The negative electrode of the second described voltage-stabiliser tube withThe base stage of the first described switching tube is connected, and the anode of the second described voltage-stabiliser tube is connected with the colelctor electrode of the second described triode,The emitter stage of the second described triode is connected with described ground, the base stage of the second described triode and described control chip andThe system of described protection testing circuit composition connects.
Preferably, the second switch pipe of described boost voltage control circuit is 431 chips; The negative electrode of the second described voltage-stabiliser tubeBe connected with the base stage of described the first switching tube, the anode of the second described voltage-stabiliser tube is connected with the negative electrode of 431 described chips,The anode of 431 described chips is connected with described ground, the Ref pin of 431 described chips and described control chip and described inThe system of protection testing circuit composition connect.
Preferably, the second switch pipe of described boost voltage control circuit is 431 chips; The negative electrode of the second described voltage-stabiliser tubeBe connected with the negative electrode of described the first diode, the anode of the second described voltage-stabiliser tube is connected with the negative electrode of 431 described chips,The anode of 431 described chips is connected with described ground, the Ref pin of 431 described chips and described control chip and described inThe system of protection testing circuit composition connect.
The beneficial effects of the utility model are as follows:
The utility model passes through the duty of the main power circuit of sense switch power supply, accessory power supply when protection appears in regulating circuitVoltage, can effectively solve chip exiting the deadlock phenomenon that when protection occurs, effectively evade under the formula protected mode of having the hiccupsThe problem that existing power device damages, simultaneously due under protected mode by accessory power supply lower voltage to chip shutoff voltage,Turn-off chip, reduced the power consumption of chip itself, also reduced the power consumption of whole start-up circuit, reduced the power consumption of product,Improve the reliability of product design.
Brief description of the drawings
Fig. 1 is existing accessory power supply power supply circuit;
Fig. 2 is specific embodiment one circuit diagram described in the utility model;
Fig. 3 is specific embodiment two circuit diagrams described in the utility model;
Fig. 4 is specific embodiment three-circuit figure described in the utility model;
Fig. 5 is specific embodiment four circuit diagrams described in the utility model.
Detailed description of the invention
Embodiment mono-
Fig. 2 is one of specific embodiment of the utility model circuit diagram, and this circuit is by start-up circuit, boost voltage control circuit,Auxiliary power supply electric capacity, control chip and protection testing circuit composition, start-up circuit wherein and auxiliary power supply electric capacity and Fig. 1 are completeIdentical, boost voltage control circuit is made up of the second voltage-stabiliser tube Z2 and the second triode Q1, and auxiliary power supply Capacitance parallel connection, toolBody ground: the negative electrode of the second voltage-stabiliser tube Z2 is connected with the negative electrode of the first diode D1, the anode of the second voltage-stabiliser tube Z2 and the two or threeThe colelctor electrode of utmost point pipe Q1 is connected, and the emitter stage of the second triode Q1 is connected with ground, the base stage of the second triode Q1 and control coreSheet is connected with the system of protection testing circuit composition. Wherein the voltage stabilizing value of the first voltage-stabiliser tube Z1 will be higher than the starting resistor of control chipValue V1, the voltage stabilizing value of the second voltage-stabiliser tube Z2 will be lower than the operational voltage value V2 of control chip.
The course of work of this circuit is described below: in the time that circuit is normally worked, protection testing circuit control signal Vb exports low electricityFlat, the base stage of the second triode Q1 of boost voltage control circuit is low level, and triode Q1 turn-offs, the second voltage-stabiliser tubeZ2 does not puncture work, and the both end voltage Vcc of auxiliary power supply capacitor C 1 is Vz1-Vbe-Vd1, and wherein Vz1 is the first voltage stabilizingThe voltage stabilizing value of pipe Z1, Vbe is the emitter junction bias voltage of the first triode TR1, Vd1 is the first diode current flow pressure drop.When protection testing circuit detects that circuit occurs that, after anomaly, circuit enters guard mode, turn-off control chip, simultaneously inspectionSurveying holding circuit output Vb is high level, and the base stage of the second triode Q1 is high level, the two or three grade of Q1 conducting, secondVoltage-stabiliser tube Z2 plus earth, due to when design the second voltage-stabiliser tube Z2 voltage stabilizing value Vz2 lower than the shutoff voltage V2 of chip, theTwo Zener diode Z2 conductings, auxiliary power supply capacitor C 1 both end voltage is the stationary value voltage of the second voltage-stabiliser tube Z2 by clamperVz2. Now system power supply Vcc=Vz2, again due to Vz2 < V2, so control chip turn-offs, system loss reduces. In systemOther circuit impedances except control chip are constant, and after Vcc reduces, the electric current consuming reduces, the mistake of protecting soThe total current that journey flows through start-up circuit also reduces, and so also reduces the power consumption of start-up circuit, reaches the order of whole system power-dissipation-reduced. After protection testing circuit detects that system protection state is cancelled, protect testing circuit output signal Vb to become low electricityFlat, the second triode Q2 turn-offs, and the second Zener diode Z2 quits work, auxiliary power supply capacitor C 1 both end voltage VccStart linear rising by start-up circuit, when Vcc rises to after control chip starting resistor V1, chip starts normal startup,Product also normally starts, the effective like this deadlock phenomenon having solved while occurring in available circuit exiting protection.
Embodiment bis-
If Fig. 3 is embodiment bis-circuit diagrams of the present utility model, be that with the difference of embodiment mono-boost voltage control circuit is in parallelAt the first voltage-stabiliser tube Z1 two ends of start-up circuit, its basic course of work is consistent with embodiment mono-, in the time there is protection in system,Protection testing circuit output control signal Vb is high level, and boost voltage control circuit the second triode Q1 base stage is high level,The second triode Q1 conducting, the second voltage-stabiliser tube Z2 conducting, because the voltage stabilizing value Vz2 of the second voltage-stabiliser tube Z2 is less than the first voltage stabilizingThe voltage stabilizing value of pipe Z1, therefore the first voltage-stabiliser tube Z1 quits work, accessory power supply voltage vcc=Vz2-Vbe-Vd1, realizes real equallyTime example one protection effect. In the time that circuit exits protected mode, its course of work is consistent with embodiment mono-, does not describe in detail at this.
Embodiment tri-
If Fig. 4 is embodiment three-circuit figure of the present utility model, the difference of itself and embodiment bis-is boost voltage control circuitTwo triodes are replaced for the first control chip U1, and the first control chip is 431 control chips, the first control chip U1'sNegative electrode is connected with the anode of the second voltage-stabiliser tube Z2, and the anode of the first control chip U1 is connected with ground, the first control chip U1'sReference end is connected with protection testing circuit. The course of work of embodiment tri-is consistent with the course of work of embodiment bis-, at this notDescribe in detail.
Embodiment tetra-
Fig. 5 is also embodiment tetra-circuit diagrams of the present utility model, and the difference of itself and embodiment mono-is boost voltage control circuitTwo triodes are replaced for the first control chip U1, and the first control chip is 431 control chips, the first control chip U1'sNegative electrode is connected with the anode of the second voltage-stabiliser tube Z2, and the anode of the first control chip U1 is connected with ground, the first control chip U1'sReference end is connected with protection testing circuit. The course of work of embodiment tetra-is consistent with the course of work of embodiment mono-, at this notDescribe in detail.
Embodiment of the present utility model is not limited to this according to foregoing of the present utility model, utilizes the ordinary skill of this area to knowKnow and customary means, do not departing under the above-mentioned basic fundamental thought of the utility model prerequisite, concrete implementing circuit in the utility modelCan also make amendment, replacement or the change of other various ways, within all dropping on the utility model rights protection scope.
Claims (9)
1. a Switching Power Supply protection control circuit, comprises that start-up circuit, auxiliary power supply electric capacity, protection testing circuit, auxiliary electrical are voltage-controlledCircuit processed and control chip;
When described start-up circuit enters guard mode for Switching Power Supply start-up course and Switching Power Supply, power, it comprises firstSwitching tube;
The energy that described auxiliary power supply electric capacity provides for storing described start-up circuit is described control chip and describedProtection testing circuit provides energy, and its one end is connected with described start-up circuit output, and the other end is connected to ground;
Auxiliary power supply voltage when described boost voltage control circuit enters guard mode for controlling described Switching Power Supply, bagDraw together second switch pipe and the second voltage-stabiliser tube, described second switch pipe is used for controlling the turn-on and turn-off of the second described voltage-stabiliser tube,The control end of described boost voltage control circuit is connected with described protection testing circuit, and described boost voltage control circuit is defeatedGo out end and be connected to described ground, described boost voltage control circuit in the time that described Switching Power Supply enters guard mode in open-mindedState, described boost voltage control circuit in the time that Switching Power Supply is normally worked in off state;
The duty of described protection testing circuit sense switch power supply, the turn-on and turn-off of the second switch pipe described in controlling,Thereby control described accessory power supply voltage, in the time that described duty enters guard mode, accessory power supply voltage is adjusted to controlBelow coremaking sheet shutoff voltage;
And the accessory power supply voltage described in when described Switching Power Supply is normally worked is higher than the operating voltage of described control chip.
2. Switching Power Supply according to claim 1 protection control circuit, is characterized in that: described boost voltage control circuit withDescribed auxiliary power supply Capacitance parallel connection, or be connected between described ground and the control end of described the first switching tube.
3. Switching Power Supply protection control circuit according to claim 1, is characterized in that: the first described switching tube is triode,MOSFET pipe or IGBT.
4. Switching Power Supply protection control circuit according to claim 1, is characterized in that: described second switch pipe is triode,MOSFET pipe, 431 chips or IGBT.
5. Switching Power Supply protection control circuit according to claim 1, is characterized in that: described start-up circuit also comprises firstResistance, the second resistance, the first voltage-stabiliser tube and the second diode; The first described switching tube is triode; Input VIN successivelyAfter the anode of the negative electrode of the first described resistance, described the first voltage-stabiliser tube, described the first voltage-stabiliser tube, be connected with described ground;Described input VIN is also successively through the colelctor electrode of the second described resistance, described the first switching tube, the first described switchAfter the negative electrode of the anode of the emitter stage of pipe, the first described diode, the first described diode to output VCC; DescribedThe base stage of the first switching tube is connected to the anode of the first described voltage-stabiliser tube.
6. Switching Power Supply protection control circuit according to claim 5, is characterized in that: described second switch pipe is triode;The negative electrode of the second described voltage-stabiliser tube is connected with the negative electrode of the first described diode, the anode of the second described voltage-stabiliser tube with described inThe second triode colelctor electrode be connected, the emitter stage of the second described triode is connected with described ground, the two or the three described utmost pointThe system of the base stage of pipe and described control chip and described protection testing circuit composition is connected.
7. Switching Power Supply protection control circuit according to claim 5, is characterized in that: described second switch pipe is triode;The negative electrode of the second described voltage-stabiliser tube is connected with the base stage of the first described switching tube, the anode of the second described voltage-stabiliser tube with described inThe second triode colelctor electrode be connected, the emitter stage of the second described triode is connected with described ground, the two or the three described utmost pointThe system of the base stage of pipe and described control chip and described protection testing circuit composition is connected.
8. Switching Power Supply protection control circuit according to claim 5, is characterized in that: described second switch pipe is 431 coresSheet; The negative electrode of the second described voltage-stabiliser tube is connected with the base stage of the first described switching tube, the anode of the second described voltage-stabiliser tube withThe negative electrode of 431 described chips is connected, and the anode of 431 described chips is connected with described ground, the Ref of 431 described chipsThe system of pin and described control chip and described protection testing circuit composition is connected.
9. Switching Power Supply protection control circuit according to claim 5, is characterized in that: described second switch pipe is 431 coresSheet; The negative electrode of the second described voltage-stabiliser tube is connected with the negative electrode of the first described diode, the anode of the second described voltage-stabiliser tube withThe negative electrode of 431 described chips is connected, and the anode of 431 described chips is connected with described ground, the Ref of 431 described chipsThe system of pin and described control chip and described protection testing circuit composition is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520921651.4U CN205248776U (en) | 2015-11-18 | 2015-11-18 | Switch power supply protection control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520921651.4U CN205248776U (en) | 2015-11-18 | 2015-11-18 | Switch power supply protection control circuit |
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| Publication Number | Publication Date |
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| CN205248776U true CN205248776U (en) | 2016-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520921651.4U Withdrawn - After Issue CN205248776U (en) | 2015-11-18 | 2015-11-18 | Switch power supply protection control circuit |
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| CN (1) | CN205248776U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281296A (en) * | 2015-11-18 | 2016-01-27 | 广州金升阳科技有限公司 | Switch power supply protection and control method and circuit |
| CN106211469A (en) * | 2016-08-24 | 2016-12-07 | 横店集团得邦照明股份有限公司 | A kind of driving means with short-circuit protection circuit and its implementation |
| CN110768215A (en) * | 2019-10-22 | 2020-02-07 | 广州金升阳科技有限公司 | Output overvoltage protection control circuit of switching power supply and control method thereof |
| US10819329B2 (en) | 2018-01-10 | 2020-10-27 | Lsis Co., Ltd. | Power supply device for protective relay |
-
2015
- 2015-11-18 CN CN201520921651.4U patent/CN205248776U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281296A (en) * | 2015-11-18 | 2016-01-27 | 广州金升阳科技有限公司 | Switch power supply protection and control method and circuit |
| CN106211469A (en) * | 2016-08-24 | 2016-12-07 | 横店集团得邦照明股份有限公司 | A kind of driving means with short-circuit protection circuit and its implementation |
| US10819329B2 (en) | 2018-01-10 | 2020-10-27 | Lsis Co., Ltd. | Power supply device for protective relay |
| US11689194B2 (en) | 2018-01-10 | 2023-06-27 | Ls Electric Co., Ltd. | Power supply device for protective relay |
| CN110768215A (en) * | 2019-10-22 | 2020-02-07 | 广州金升阳科技有限公司 | Output overvoltage protection control circuit of switching power supply and control method thereof |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160518 Effective date of abandoning: 20180119 |