CN104935158A - Novel zero voltage switching circuit and bidirectional conversion controller - Google Patents
Novel zero voltage switching circuit and bidirectional conversion controller Download PDFInfo
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- CN104935158A CN104935158A CN201510420035.5A CN201510420035A CN104935158A CN 104935158 A CN104935158 A CN 104935158A CN 201510420035 A CN201510420035 A CN 201510420035A CN 104935158 A CN104935158 A CN 104935158A
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- 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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The present invention provides a novel zero voltage switching circuit and a bidirectional conversion controller thereof. The bidirectional conversion controller is used for controlling a circuit to perform power conversion for an input power supply. The bidirectional conversion controller comprises a work period unit, a starting unit and a protection unit; wherein the work period unit is used for controlling the circuit to perform power conversion according to a feedback signal; the starting unit is used for outputting a plurality of protection starting signals according to a timing result of a timing circuit; and the protection unit is used for detecting the circuit and generating a protection signal when judging that the circuit is abnormal, then the work period unit stops operation according to the protection signal, wherein the protection unit has a plurality of protection functions, and can start the corresponding protection functions according to the plurality of protection starting signals.
Description
Technical field
The present invention relates to power initiation control field, espespecially a kind of novel zero voltage switch circuit and two-way changing controller with protection start-up performance.
Background technology
Switching circuit now mainly can be divided into linear formula and switched power supply two kinds.The circuit of linear formula switching circuit is simple, ripple is little, electromagnetic interference is little, but electronic building brick is comparatively large, therefore the large and Heavy Weight of circuit volume, and conversion efficiency is low.Although suitching type switching circuit circuit is more complicated, and ripple is larger, electromagnetic interference is also larger, the advantage that during owing to there being conversion efficiency high, unloaded, power consumption is little, and the market of current switch circuit is for main flow with suitching type switching circuit.
The Main Function of switching circuit is carried out by an input electric power being converted into suitable driving power to drive load.And cause the damage of assembly in order to avoid the exception of circuit, even jeopardize the safety of user, switching circuit can, when detecting circuit abnormality, stop providing electrical power to load.But, when driving power is not stablized novel zero voltage switch circuit just starts, circuit abnormality can be judged by accident, therefore generally in starting a rear preset time period time-out safeguard function to avoid erroneous judgement.
Protection common at present had high voltage protective, crossed low-voltage variation, overcurrent protection etc., and the circuit protection that still may run in order to avoid preset time period is too short is judged by accident, can with protect start time point the latest for benchmark, unification starting protection function.But unified starting protection mode can make other defencive function start in time, causes the leak in protection, makes switching circuit protect circuit all sidedly.
Summary of the invention
In view of the protection leak that the unified starting protection in prior art causes; the object of the present invention is to provide a kind of novel zero voltage switch two-way changing circuit; be in the mode of scheduled timing starting protection function, reach and start each defencive function in good time, and reduce the leak in protection.
For reaching above-mentioned purpose, the invention provides a kind of two-way changing controller, in order to control circuit, electric power conversion being carried out to input power.Two-way changing controller comprises work period unit, start unit and protected location.Work period unit controls this circuit to carry out electric power conversion according to feedback signal.Protection starts control unit and exports multiple protection enabling signal according to the timing result of timing circuit.Protected location is in order to detect this circuit and produce a guard signal in time judging this circuit abnormality, and work period unit decommissions according to guard signal, and wherein protected location has multiple defencive function, starts corresponding defencive function according to multiple protection enabling signal.
Present invention provides a kind of novel zero voltage switch circuit, comprise circuit and two-way changing controller.Circuit couples input power to change the electric power of input power to drive load.Two-way changing controller, according to the feedback signal of state representing load, carries out circuit conversion with control circuit, and when the abnormal state of decision circuitry and load, starts defencive function corresponding in multiple defencive function change with the electric power of halt circuit.Wherein, two-way changing controller starts multiple defencive function according to an enabling signal with a predetermined protection start-up routine.
The present invention is in the mode of scheduled timing starting protection function, reaches and starts each defencive function in good time, and reduces the leak in protection.
Above general introduction and ensuing detailed description are all exemplary in nature, are to further illustrate claim of the present invention.And other object for the present invention and advantage, set forth in follow-up explanation and diagram.
Accompanying drawing explanation
Fig. 1 is the circuit diagram being applied to a two-way transform controller starting control unit according to the protection of the first preferred embodiment of the present invention.
Fig. 2 is corresponding sequential chart embodiment illustrated in fig. 1.
Fig. 3 is the circuit diagram of the novel zero voltage switch circuit according to the first embodiment of the present invention.
Fig. 4 is the circuit diagram of novel zero voltage switch circuit according to a second embodiment of the present invention.
Fig. 5 is the circuit diagram being applied to two-way changing controller starting control unit according to the protection of the second preferred embodiment of the present invention.
Primary clustering symbol description: protection starts control unit 100,200,300,400
;timing comparison circuit 110,410
;comparator 112,114,116,411,412,413,414
;protected location 120,220,320,420
;nOR gate 122,422
;nAND gate 124,424
;circuit 130,230,330,430
;soft starting circuit 205
;load 235,335
;work period unit 240,340
;two-way changing controller 250,350
;or door 417,418
;electric capacity C
;first charging current source I1
;second charging current source I2
;charging current adjustment interrupteur SW
;reference signal V1, V1 ', V2, V2 ', V3
;under-voltage locking guard signal UVLO
;enabling signal EN
;guard signal PROT
;reset interrupteur SW re
;voltage Vc
;time point t1, t2, t3, t4
;protection enabling signal Pe, Pe1, Pe2, Pe3
;protective function circuit P1, P2, P3
;input switch SWf
;input power Vin
;protection switch SWp
;protective resistance Rf
;credit VFB
;circuit 230
;first interrupteur SW 1
;second switch SW2
;inductance L
;output capacitance Co
;voltage detection circuit VD
;output voltage Vout
;soft-start signal SS
;load current signal Ise
;current sense signal Cse
;load current Iload
;switch M
;diode D
;detecting voltage signal Vse
;input resistance Rin
;input capacitance Cin
;zener diode Ze.
Embodiment
Refer to Fig. 1, the protection for the first preferred embodiment according to the present invention starts the circuit diagram being applied to two-way changing controller of control unit.Protection starts control unit 100 and comprises timing circuit, and timing circuit has electric capacity C, charging circuit and timing comparison circuit 110, and wherein charging circuit comprises the first charging current source I1, the second charging current source I2 and charging current adjustment interrupteur SW.Timing comparison circuit 110 comprises comparator 112,114,116.The non-inverting input coupling capacitance C of above-mentioned three comparators 112,114,116, and end of oppisite phase receives reference signal V1, V2, V3 respectively, wherein the level of reference signal V1 is lower than the level of reference signal V2, and the level of reference signal V2 is lower than the level of reference signal V3.In addition, protection startup control unit 100 comprises resets unit, receives under-voltage locking guard signal UVLO, enabling signal EN and guard signal PROT, to determine to protect the time zero starting control unit.Reset unit to comprise NAND gate 124 and and reset interrupteur SW re, when reseting, can discharge to electric capacity C, the voltage Vc on electric capacity C is made zero, so that timing circuit reclocking.In the present embodiment; when the driving voltage that two-way changing controller is not yet activated (enabling signal EN is low level), two-way changing controller receives is not adequate height (under-voltage locking guard signal UVLO is low level) and circuit abnormality (guard signal PROT is low high levle) wherein arbitrary situation occurs, conducting is reseted interrupteur SW re to reset timing circuit by NAND gate 124.Therefore, it is determine according to enabling signal EN etc. that the protection of the present embodiment starts time point that control unit 100 starts timing, and at driving voltage during not enough or any circuit abnormality, can restart.
Please, simultaneously see Fig. 2, be corresponding sequential chart embodiment illustrated in fig. 1.Be turned off in time point t0 when reseting interrupteur SW re, the voltage Vc of electric capacity C rises starting, make comparator 112, 114, 116 respectively at time point t1, t2, t3 sequentially exports the protection enabling signal Pe1 of high levle, Pe2, Pe3, with the defencive function circuit P1 in the corresponding starting protection unit 120 of difference, P2, P3, defencive function circuit can be high voltage protective (Over Voltage Protection) circuit, cross low-voltage variation (Under Voltage Protection) circuit, excessive current protection (Over Current Protection) circuit, or cross low current protection (Under Current Protection) circuit, cross high temperature protection (Over Temperature Protection) circuit etc.In time point t4; when the circuit state that arbitrary defencive function circuit P1, P2, P3 in protected location 120 detect corresponding detecting after starting has abnormal; by exporting the guard signal PROT of low level through NOR gate 122, two-way changing controller is made to enter guard mode.Meanwhile, reset unit and electric capacity C is discharged, voltage Vc is made zero.
Protection starts control unit 100 can control an input switch SWf simultaneously, continues to input to the circuit 130 that two-way changing controller controls, the unlikely damage of assembly when making circuit for generating abnormal in circuit to determine whether to stop the electric power of input power Vin.Input switch SWf is coupled between input power Vin and circuit 130.An one protection switch SWp and protective resistance Rf is series between input power Vin and ground connection, and its tie point connects the control end of input switch SWf.When protecting the voltage Vc of the electric capacity C started in control unit 100 to make zero; protection switch SWp will be made to turn off; now the tie point current potential of protection switch SWp and protective resistance Rf will rise to and input power Vin equipotential, input switch SWf also be turned off and stop the electric power of input power Vin to continue input circuit 130.
The boot sequence of above-mentioned defencive function circuit can decide according to side circuit; generally speaking more close with input power circuit protection starting point is more preferential; current protection also has precedence over voltage protection, and the protection of the more weak assembly of specification also has precedence over the protection of the stronger assembly of specification.Therefore, different circuit design has different protection start-up routines, and protection of the present invention starts control unit can design predetermined protection start-up routine by designer according to side circuit, and these defencive functions of sequential start according to this.
The level of timing circuit through reference signal V1, V2, V3 and the charging current setting of charging circuit, can determine morning or the evening of protection point start-up time of defencive function circuit P1, P2, the P3 in protected location 120.In addition, because comparator has the scope restriction can detecting level, too low or too high level cannot may be detected because of noise etc., therefore may restricted difficulty in time timing.Therefore charging circuit of the present invention can adjust the size of charging current according to the protection enabling signal of timing comparison circuit 110, to obtain the clocking capability of shorter or long period.In the present embodiment; in time t0-t1; charging circuit charges to electric capacity C with the electric current of the first charging current source I1 and the second charging current source I2 simultaneously; the voltage Vc of electric capacity C arrives the level of reference signal V1 fast; when making comparator 112 export the protection enabling signal Pe1 of high levle; charging current adjustment interrupteur SW will turn off, and now charging circuit only charges to electric capacity C with the electric current of the first charging current source I1.In addition, timing circuit decides except the start-up point of each defencive function except utilizing the charging potential of electric capacity, also can produce pulse signal the known common timing modes such as the mode of counting pulse signal number of times carry out timing by frequency of utilization generator.And it is similar to utilize capacitor charging to improve the practice of work period gradually in the practice of capacitor charging and known soft start, the use therefore above-mentioned two circuit can be bonded to each other.This part refers to the explanation of following examples.
Referring to Fig. 3, is the circuit diagram of the novel zero voltage switch circuit of one first embodiment according to the present invention.Novel zero voltage switch circuit comprises circuit 230 and a two-way transform controller 250.Circuit 230 couples input power Vin to change the electric power of input power Vin to drive a load 235.Two-way changing controller 250, according to the feedback signal VFB of state representing load, carries out circuit conversion with control circuit.In the present embodiment, circuit 230 is the direct-current voltage reducing circuit that always circulates, and comprises one first interrupteur SW 1, second switch SW2, an inductance L and an output capacitance Co.Two-way changing controller 250 controls the first interrupteur SW 1, the conducting of second switch SW2 and shutoff according to the feedback signal VFB that a voltage detection circuit VD produces, the voltage drop of input power Vin to be transferred to a stable output voltage Vout, to drive load 235.
Two-way changing controller 250 contains start unit 200, soft starting circuit 205, protected location 220 and work period unit 240.Soft starting circuit 205 produces a soft-start signal SS after reception enabling signal EN, work period unit 240 receives soft-start signal SS and carries out a soft start program accordingly, the turn-on cycle proportion (work period) of the first interrupteur SW 1 is increased gradually, the excessive ripple (Ripple) that causes with work period too fast raising at the beginning of avoiding starting.Protection starts control unit 200 and determines time zero according to enabling signal EN, and exports multiple protection enabling signal Pe to protected location 220, with the defencive function of sequential start protected location 220 correspondence according to predetermined start-up routine.In the present embodiment, soft-start signal SS be in time level rise signal, the function of voltage Vc as shown in Figure 1 can be replaced, with as protection start control unit 200 timing according to.Protected location 220 circuit for detecting and produce a guard signal PROT when the abnormal state of decision circuitry and load, makes work period unit 240 decommission.In the present embodiment; protected location 220 is according to feedback signal VFB, load current signal Ise and current sense signal Cse; to judge that whether output voltage Vout is too high or too low, whether load current Iload is too high or too low and whether input current is too high or too low respectively; and when above-mentioned arbitrary circuit abnormality state occurs; or occur and after a predetermined time time; produce guard signal PORT to work period unit 240, make two-way changing controller 250 enter protected mode and carry out circuit conversion with halt circuit 230.Guard signal PORT exports protection simultaneously to and starts control unit 200, and the timing making protection start control unit 200 is reseted.
Referring to Fig. 4, is the circuit diagram of the novel zero voltage switch circuit of one second embodiment according to the present invention.Novel zero voltage switch circuit comprises circuit 330 and a two-way transform controller 350, and in order to be carried out by the electric power of input power Vin changing to drive a load 335, in the present embodiment, load 335 is a light-emitting diode (LED) module.
Two-way changing controller 350, according to the current sense signal Cse (at the present embodiment with current sense signal Cse as feedback signal) of current status representing load, carries out circuit conversion with control circuit.In the present embodiment, circuit comprises a switch M, an inductance L and diode D.One current sense resistance Rse couples switch M with the electric current generation current detection signal Cse according to load.Voltage detection circuit VD couples the negative terminal of load 335, produces a detecting voltage signal Vse according to the cross-pressure in load 335.One input switch SWf is coupled between input power Vin and circuit 330.An one protection switch SWp and protective resistance Rf is series between input power Vin and ground connection, and its tie point connects the control end of input switch SWf.When two-way changing controller 350 decision circuitry occurs abnormal; input switch SWf can be turned off through protection switch SWp and a protective resistance Rf; now stopping is inputed to circuit 330 by the electric power of input power Vin, to reach the function of protective circuit 330 and load 335.In addition, a drive voltage circuit comprises an input resistance Rin, an input capacitance Cin and Zener diode Ze, and it couples input power Vin to provide a driving voltage VDD to two-way changing controller 350.
Two-way changing controller 350 contains start unit 300, protected location 320 and work period unit 340.Work period unit 340 judges the electric current of load 335 according to current sense signal Cse, and arrive according to shutdown switch M during higher limit in the electric current of load 335, and after a fixing turn-off time actuating switch M once again, the electric current of load 335 is maintained in a preset range.Work period unit 340 also carries out pulse light modulation (Burst Dimming) according to a dim signal DIM to load 335.
Protection starts control unit 300 and determines time zero according to enabling signal EN and dim signal DIM, and exports multiple protection enabling signal Pe to protected location 320, with the defencive function of starting protection unit 320 correspondence according to predetermined start-up routine.The protection startup control unit 300 of the present embodiment restarts timing when can be represented as " ON " in dim signal DIM; and the protection of " OFF " time-out safeguard unit 320 is represented as in dim signal DIM, may circuit abnormality be mistaken for when being represented as " OFF " to avoid dim signal DIM.
Protected location 320 circuit for detecting and produce a guard signal PROT when the abnormal state of decision circuitry and load, makes work period unit 340 decommission.In the present embodiment; protected location 320 is according to detecting voltage signal Vse and current sense signal Cse; whether the number be short-circuited with the light-emitting diode judged respectively in load 335 is too much, whether load current is too high; and in above-mentioned arbitrary circuit abnormality state occur and after a predetermined time time; produce guard signal PORT to work period unit 340, make two-way changing controller 350 enter protected mode and carry out circuit conversion with halt circuit 330.Guard signal PORT exports protection simultaneously to and starts control unit 300, and the timing making protection start control unit 300 is reseted.
Above-described embodiment starts corresponding defencive function with predetermined sequential, and start can with one to one or one-to-many (namely same time point starts multiple protection) mode start these defencive functions.In addition, according to circuit state, the present invention still can be judged which defencive function can start ahead of time, to reach better protection.
Refer to Fig. 5, the protection for the second preferred embodiment according to the present invention starts the circuit diagram being applied to two-way changing controller of control unit.Protection starts control unit 400 and comprises electric capacity C, charging circuit and timing comparison circuit 410, and wherein charging circuit comprises the first charging current source I1, the second charging current source I2 and charging current adjustment interrupteur SW.Timing comparison circuit 410 comprises comparator 411,412,413,414 and or door 417,418.The non-inverting input coupling capacitance C of comparator 412,414, and end of oppisite phase receives reference signal V1, V2, wherein the level of reference signal V1 is lower than the level of reference signal V2.The non-inverting input received current detection signal Cse of comparator 411, and end of oppisite phase receives reference signal V1 ' respectively.The non-inverting input receiver voltage detection signal Vse of comparator 413, and end of oppisite phase receives reference signal V2 '.Or door 417 output signal that receives comparator 411,412 is with output protection enabling signal Pe1 to the defencive function circuit P1 of protected location 420.Or door 418 output signal that receives comparator 413,414 is with output protection enabling signal Pe2 to the defencive function circuit P2 of protected location 420.In addition, protection startup control unit 400 comprises resets unit, receives under-voltage locking guard signal UVLO, an enabling signal EN, a dim signal DIM and guard signal PROT, to determine to protect the time zero starting control unit.Reset unit to comprise NAND gate 424 and and reset interrupteur SW re, when reseting, can discharge to electric capacity C, the voltage Vc on electric capacity C is made zero, so that timing circuit reclocking.Protection starts control unit 400 and through the protection switch SWp be series between input power Vin and ground connection and protective resistance Rf control inputs interrupteur SW f, can turn off input switch SWf and stop the electric power of input power Vin to continue input circuit 430 when circuit abnormality.
Defencive function circuit P1 received current detection signal Cse, to judge whether extremely current sense signal Cse detects the electric current of object.And when this electric current rises to (reference signal V1 ' representated by) predetermined value, representative can start to judge this electric current.Therefore, even if comparator 412 not yet exports high levle signal, or the high levle signal that door 417 still can export according to comparator 411 produces protection enabling signal Pe1, and defencive function circuit P1 is started.In like manner, defencive function circuit P2 receiver voltage detection signal Vse, to judge whether extremely detecting voltage signal Vse detects the voltage of object.And when this voltage rises to (reference signal V2 ' representated by) predetermined value, representative can start to judge this voltage.Therefore, even if comparator 414 not yet exports high levle signal, or the high levle signal that door 418 still can export according to comparator 413 produces protection enabling signal Pe2, and defencive function circuit P2 is started.
As mentioned above, the present invention meets patent three important document completely: the practicality in novelty, creativeness and industry.The present invention discloses with preferred embodiment hereinbefore, and being so familiar with the technology person it should be understood that this embodiment only for describing the present invention, and should not be read as and limit the scope of the invention.It should be noted, such as with change and the displacement of this embodiment equivalence, all should be set to and be covered by category of the present invention.Therefore, the scope that protection scope of the present invention ought define with claims is as the criterion.
Claims (8)
1. a two-way changing controller, is characterized in that, carries out electric power conversion in order to control circuit to input power, and this two-way changing controller comprises:
Work period unit, controls this circuit to carry out electric power conversion according to feedback signal;
Start unit, sequentially exports multiple protection enabling signal according to the timing result of timing circuit; And
Protected location; in order to detect this circuit and produce guard signal in time judging this circuit abnormality; this work period unit decommissions according to this guard signal; wherein this protected location has multiple defencive function, the defencive function that the multiple protection enabling signal sequential starts sequentially exported according to this are corresponding.
2. two-way changing controller according to claim 1, is characterized in that, this timing circuit starts timing according to enabling signal, dim signal, this guard signal or its combination;
This timing circuit comprises electric capacity, charging circuit and timing comparison circuit, and this charging circuit is when this timing circuit starts timing, and with a charging current to this capacitor charging, this timing comparison circuit produces the plurality of protection enabling signal according to the voltage of this electric capacity;
This timing circuit is a soft starting circuit, produces a soft-start signal, and this work period unit carries out a soft start program according to this soft-start signal.
3. two-way changing controller according to claim 3, is characterized in that, this charging circuit according to the plurality of protection enabling signal at least one of them adjusts the size of this charging current.
4. two-way changing controller according to claim 1, is characterized in that, this protection starts control unit and also whether exports protection enabling signal corresponding in the plurality of protection enabling signal according at least one detection signal ahead of time with decision.
5. a novel zero voltage switch circuit, is characterized in that, comprise:
Circuit, couples input power, to change the electric power of this input power to drive load; And
Two-way changing controller, according to the feedback signal of state representing this load, carry out circuit conversion to control this circuit, and the defencive function starting correspondence in multiple defencive function in time judging the abnormal state of this circuit and this load is changed to stop the electric power of this circuit;
Wherein, this two-way changing controller comprises timing circuit with timing, and this two-way changing controller sequentially exports multiple protection enabling signal with the plurality of defencive function of sequential start according to the timing result of this timing circuit.
6. novel zero voltage switch circuit according to claim 5, it is characterized in that, also comprise input control switch and couple this input power and this circuit, wherein this two-way changing controller is in time judging the abnormal state of this circuit and this load, controls the closedown of this input control switch and connects this input power and this circuit with decoupling.
7. the novel zero voltage switch circuit according to claim 5 or 6, is characterized in that, also comprise drive circuit, couples this input power to produce driving voltage to this two-way changing controller to provide the electric power needed for the operation of this two-way changing controller.
8. novel zero voltage switch circuit according to claim 7, it is characterized in that, this load comprises at least light-emitting diode, this two-way changing controller is according to a dim signal to carry out pulse light modulation program to this light-emitting diode, and this two-way changing controller also starts multiple defencive function according to this dim signal with a predetermined start-up routine;
This two-way changing controller also determines whether start defencive function corresponding in the plurality of defencive function ahead of time according at least detection signal.
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|---|---|---|---|
| CN201510420035.5A CN104935158A (en) | 2015-07-17 | 2015-07-17 | Novel zero voltage switching circuit and bidirectional conversion controller |
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|---|---|---|---|
| CN201510420035.5A CN104935158A (en) | 2015-07-17 | 2015-07-17 | Novel zero voltage switching circuit and bidirectional conversion controller |
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| CN201510420035.5A Pending CN104935158A (en) | 2015-07-17 | 2015-07-17 | Novel zero voltage switching circuit and bidirectional conversion controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106230249A (en) * | 2016-09-09 | 2016-12-14 | 杰华特微电子（杭州）有限公司 | The control method of a kind of AC/DC change-over circuit and control module |
| CN109119969A (en) * | 2017-06-26 | 2019-01-01 | 立锜科技股份有限公司 | Overvoltage protection method, step-down switching power supply and control circuit thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102761248A (en) * | 2011-04-26 | 2012-10-31 | 登丰微电子股份有限公司 | Power conversion circuit and conversion controller |
-
2015
- 2015-07-17 CN CN201510420035.5A patent/CN104935158A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102761248A (en) * | 2011-04-26 | 2012-10-31 | 登丰微电子股份有限公司 | Power conversion circuit and conversion controller |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106230249A (en) * | 2016-09-09 | 2016-12-14 | 杰华特微电子（杭州）有限公司 | The control method of a kind of AC/DC change-over circuit and control module |
| CN106230249B (en) * | 2016-09-09 | 2018-12-14 | 杰华特微电子（杭州）有限公司 | A kind of control method and control module of AC/DC conversion circuit |
| CN109119969A (en) * | 2017-06-26 | 2019-01-01 | 立锜科技股份有限公司 | Overvoltage protection method, step-down switching power supply and control circuit thereof |
| CN109119969B (en) * | 2017-06-26 | 2020-03-31 | 立锜科技股份有限公司 | Overvoltage protection method, step-down switching power supply and control circuit thereof |
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Application publication date: 20150923 |