CN108123429A - Excess voltage protection - Google Patents
Excess voltage protection Download PDFInfo
- Publication number
- CN108123429A CN108123429A CN201611112578.1A CN201611112578A CN108123429A CN 108123429 A CN108123429 A CN 108123429A CN 201611112578 A CN201611112578 A CN 201611112578A CN 108123429 A CN108123429 A CN 108123429A
- Authority
- CN
- China
- Prior art keywords
- signal
- impedance
- voltage
- couples
- protection
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
Abstract
The present invention proposes a kind of excess voltage protection; it is that internal feedback failure causes or additional power source causes that it, which can distinguish switching power supply device output voltage overvoltage condition; using the time difference for starting overvoltage protection; of short duration and harmless additional power source is avoided to influence switching power supply device normal work, but can stop switching power supply device start in real time again during feedback failure inside switching power supply device and reach protection.
Description
Technical field
The invention relates to a kind of excess voltage protections, are suitable for switching power supply in particular to one kind
The excess voltage protection of device.
Background technology
General switching power supply device (Switching power supply) can all use overvoltage protection electricity
Road, when overvoltage is presented in the output terminal of switching power supply device, can control in switching power supply device
Pulse Width Modulation (Pulse Width Modulation, PWM) control circuit stops output pulse width modulation signal, and then it is defeated to reduce this
The output voltage size of outlet, with the inside of the internal wiring to switching power supply device and the outer welding system of the output terminal
Circuit carries out overvoltage protection, both is avoided to have any one to be destroyed.
Overvoltage can be presented due to two kinds of situations in the output terminal, one is the internal circuit by switching power supply device
Caused by failure, when being, for example, feedback circuit failure；The second is as caused by outer welding system, such as the outer welding system with motor
The caused counter electromotive force feedback when slowing down.However, traditional excess voltage protection and both is cannot be distinguished from, so that
User outside normal operating welding system and when causing counter electromotive force feedback, traditional excess voltage protection can still control switching
Formula power supply device reduces the size of its output voltage to carry out overvoltage protection immediately, and outer welding system is so instead caused to close
Machine and can not normal use, cause the no small puzzlement of user.
The content of the invention
The purpose of the present invention is providing a kind of excess voltage protection, can distinguish excessively electric caused by two kinds of situations
Pressure, and two kinds of different modes is taken to carry out overvoltage protection.
The present invention proposes a kind of excess voltage protection, and it is suitable for switching power supply devices.It is using startup
The time difference of overvoltage protection, difference switching power supply device output voltage overvoltage condition cause for internal feedback failure or
It is that additional power source causes, of short duration and harmless additional power source is avoided to influence switching power supply device normal work, but works as and cuts
It can stop switching power supply device start in real time again when changing feedback failure inside formula power supply device and reach protection.
For above and other objects of the present invention, feature and advantage can be clearer and more comprehensible, preferred embodiment cited below particularly
And institute's accompanying drawings is coordinated to be described below in detail.
Description of the drawings
Fig. 1 is the coupling relation schematic diagram of excess voltage protection.
Specific embodiment
Fig. 1 is the coupling relation schematic diagram of excess voltage protection.In Fig. 1, switching power supply device 100 includes
There are noise filter 110, AC-DC conversion circuit 120, power stage (Power stage) 130, transformer 140, rectified current
Road 150, energy-storage units 160, feedback circuit 170 and signal isolated location 180.The first siding ring of transformer 140 can thoroughly sequentially
Overpower grade 130, AC-DC conversion circuit 120 couple input voltage VIN with noise filter 110.Noise filter
110 can be EMI FILTER, and user can decide whether using noise filter 110.
In addition, AC-DC conversion circuit 120 can be bridge rectifier.It is internal that there is PWM controls as power stage 130
Circuit 132 processed is with being used for the power transistor 134 as switch.This power transistor 134 can be with a side line of transformer 140
Circle series connection by the open/close states (On/off state) of control power transistor 134 can decide whether that electric current is allowed to pass through
First siding ring.And pwm control circuit 132 is then to generate PWM signals, and export control of the PWM signals to power transistor 134
Switching frequency of the control power transistor 134 between open/close states is used at end processed.
The output of the second siding ring of transformer 140 is carrying out rectification respectively by rectification circuit 150 with energy-storage units 160
After filtering, it can be supplied to as the output voltage VO UT of switching power supply device 100 from its output terminal 190 external
System (does not illustrate).Furthermore rectification circuit 150 can also decide whether to use with energy-storage units 160 according to design requirement.In addition,
Signal isolated location 180 can be photo-coupler (Photo coupler), can be by feedback signal caused by feedback circuit 170
Pwm control circuit 132 is sent to, to allow pwm control circuit 132 that can adjust the responsibility cycle (Duty of PWM signals according to this
cycle).Therefore, when overvoltage is presented in the output terminal 190 of switching power supply device 100, pwm control circuit 132
The feedback signal that transmits according to signal isolated location 180 reduces output voltage VO UT, to carry out overvoltage protection.
In addition, in Fig. 1, excess voltage protection 200 includes impedance 210, impedance 220, energy-storage units 230, switch
Unit 240, overvoltage detecting unit 250, voltage sampling unit 270 and signal isolated location 280.Impedance 210 has the first resistance
Value, impedance 220 has the second resistance value, and the second resistance value is more than the first resistance value.One end coupling impedance 210 of energy-storage units 230
Wherein one end and wherein one end of impedance 220, and the other end of energy-storage units 230 coupling reference potential SGND.Wherein, with reference to electricity
Position SGND is earthing potential.
Switch unit 240 has first end 241,242 and the 3rd end 243 of second end, and second end 242 couples impedance 210
The other end, first end 241 couple wherein one end of impedance 220.Overvoltage detecting unit 250 couples switching power supply device
100 output terminal 190, the first end 241 of switch unit 240 and the other end of impedance 220, on Rreceive output end 190
Output voltage VO UT, and judge output voltage VO UT whether more than the first default value.
Voltage sampling unit 270 has the 4th end 271 and the 5th end 278-5, the 5th end 278-5 coupling switch units 240
The 3rd end 243, wherein one end of the second siding ring of the transformer of the 4th end 271 coupling switching power supply device 100,
Whether to detect voltage that second siding ring exported up to the second default value, and the 5th end 278- is just turned on when being judged as YES
5 and reference potential SGND, and the conducting of controllable switch unit 240 first if the output of overvoltage detecting unit 250 is positive voltage
Electrical path between end 241 and second end 242.
Signal isolated location 280, coupling first energy-storage units 230, impedance 210, impedance 220 and switching power supply fill
100 pwm control circuit 132 is put, and is protected according to the voltage swing stored by energy-storage units 230 to decide whether to generate overvoltage
Shield triggering signal TRI controls pwm control circuit 132 to stop output pulse width modulation to trigger signal TRI using overvoltage protection
Signal is to power transistor 134.
In this instance, impedance 210, impedance 220 and energy-storage units 230 may respectively be resistance and capacitance.Next, will first it be situated between
Continue the detailed embodiment of 200 rest part of excess voltage protection.As shown in Figure 1, overvoltage detecting unit 250 includes point
Volt circuit 252 and comparator 254.Bleeder circuit 252 is coupled to output terminal 190 and the reference of switching power supply device 100
Between current potential SGND, and partial pressure signal is generated according to the voltage of output terminal 190.The positive input terminal of comparator 254 is receiving
The partial pressure signal of bleeder circuit 252, negative input end is to receive reference potential Vref, and its output then couples switch unit 240
First end 241 and impedance 220.Bleeder circuit 252 can be impedance 252-1 and 252-2, and one end of middle impedance 252-1 couples
Output terminal 190, and the other end of one end of impedance 252-2 coupling impedance 252-1, the other end coupling of impedance 252-2 is with reference to electricity
Position SGND.Impedance 252-1 and 252-2 all can be resistance.
Switch unit 240 includes PNP transistor 244, impedance 245 and impedance 246.PNP transistor 244, which has, to be penetrated
Pole, base stage and collector, and its base stage couples the 5th end 278-5 of voltage sampling unit 270 through impedance 245, and determine according to this
Whether turn on.
Voltage sampling unit 270 includes diode 273, energy-storage units 274, bleeder circuit 276 and votage control switch 278.
One end of the second siding ring of the anode coupling transformer 140 of diode 273.Energy-storage units 274 are coupled to the moon of diode 273
Between pole and reference potential SGND.Bleeder circuit 276 is coupled between the cathode of diode 273 and reference potential SGND, and according to
Partial pressure signal is generated according to the voltage stored by energy-storage units 274.Votage control switch 278 has the 5th end 278-5, the 6th end 278-
6 and reference edge R, and the 5th end 278-5 coupling switch units 260, the 6th end 278-6 coupling reference potential SGND, and reference edge R
To receive partial pressure signal caused by bleeder circuit 276.When the voltage of the reference edge R of votage control switch 278 reaches the 3rd acquiescence
During value, votage control switch 278 just makes the 5th end 278-5 and the 6th end 278-6 form conducting state.Bleeder circuit 276 can be impedance
276-1 and 276-2.The cathode of one end coupling diode 273 of its middle impedance 276-1, one end coupling impedance of impedance 276-2
The other end of 276-1, and the other end of impedance 276-2 coupling reference potential SGND.
Signal isolated location 280 includes diode 282, signal transport unit 284 and signal reception portion 286.Diode 282
Anode coupling energy-storage units 230 and impedance 220.The cathode of one end coupling diode 282 of signal transport unit 284, and it is another
End coupling reference potential SGND.This signal transport unit 284 is generating coupling signal.One end coupling PWM in signal reception portion 286
Control circuit 132, and other end coupling reference potential PGND.It is produced according to this to receive coupling signal in this signal reception portion 286
Raw overvoltage protection triggering signal TRI.Wherein, signal transport unit 284 include be photo-coupler light emitting portion, light emitting portion use
With generate light source come as coupling signal, and signal reception portion 286 include be photo-coupler light receiver, light receiver to
Receive the coupling signal that light source is formed.282 visual demand of diode and decide whether to use.
Next, the detailed mode of operation that excess voltage protection 200 will be introduced.First come illustrate switched-mode power supply supply
Answer device 100 internal circuit fail and cause its output terminal 190 present overvoltage in the case of, voltage protection circuit 200
Mode of operation.Referring again to Fig. 1, when the output voltage VO UT on output terminal 190 is more than the first default value, and cause bleeder circuit
When the voltage of partial pressure signal is more than the voltage of reference potential Vref produced by 252, the output of comparator 254, which will be presented, just satisfies
With.
Hold it is above-mentioned, due to output terminal 190 present overvoltage be because switching power supply device 100 internal circuit lose
Caused by effect, e.g. because caused by failing feedback circuit 170.So feedback circuit 170 will can not generate feedback news
Number, therefore pwm control circuit 132 feedback signal that can not also be transmitted according to signal isolated location 180 adjusts PWM signals
Responsibility cycle, thus output voltage VO UT can not be reduced, and the voltage that second siding ring (Secondary winding) is exported
It can constantly be promoted.
Reach the second default value when the voltage that second siding ring is exported constantly is promoted, and then make 276 institute of bleeder circuit
When the voltage of the partial pressure signal of generation reaches three default values, the 5th end 278-5 and the 6th end 278- of votage control switch 278 will be made
6 form conducting state.Therefore, the 3rd end 243 of switch unit 240 will be electrically connected to reference potential SGND and be pulled down to and connect
Ground potential, and then the first end 241 of switch unit 240 and second end 242 is made to form conducting state.Due to PNP transistor 244
The resistance value in the path provided can be much smaller than the resistance value of impedance 220, therefore the electric current that comparator 254 exports can select away positive-negative-positive
The path that transistor 244 is provided charges to energy-storage units 230.
According to preceding description, energy-storage units 230 can soon fill full and turn on diode 282, and transmit signal
Portion 284 can soon generate coupling signal.And signal reception portion 286 can generate according to this after coupling signal is received
Voltage protection triggers signal TRI to pwm control circuit 132, allows pwm control circuit 132 that can penetrate control power transistor 134
Operation reduce output voltage VO UT immediately, to carry out overvoltage protection.
It next it will be described in the case where outer welding system causes output terminal 190 that overvoltage is presented, voltage protection circuit 200
Mode of operation.Referring again to Fig. 1, when the output voltage VO UT on output terminal 190 is more than the first default value, and make bleeder circuit
When the voltage of partial pressure signal is more than the voltage of reference potential Vref produced by 252, the output of comparator 254, which will be presented, just satisfies
With.
Hold it is above-mentioned, due to output terminal 190 present overvoltage be by outer welding system caused by, it is outer e.g. with motor
Welding system is when slowing down caused by caused counter electromotive force feedback.Therefore feedback circuit 170 will normally generate feedback signal,
The feedback signal that pwm control circuit 132 is transmitted according to signal isolated location 180 is enable to adjust the responsibility cycle of PWM signals, because
And output voltage VO UT can be reduced, and the voltage that second siding ring (Secondary winding) is exported will decline.
The second default value is unable to reach when the voltage that second siding ring is exported constantly declines, and makes bleeder circuit 276
When the voltage of generated partial pressure signal is also unable to reach three default values, the 5th end 278-5 for making votage control switch 278 will be unable to
Conducting state is formed with the 6th end 278-6.Therefore closed state (Off state) also can be and then presented in PNP transistor 244,
And then one end 241 of switch unit 240 and second end 242 can not be made to form conducting state.Therefore the electric current that comparator 254 exports
It can only charge through impedance 220 to energy-storage units 230.
Since the resistance value of impedance 220 is much larger than the resistance value in the path that PNP transistor 244 is provided, energy-storage units
230 charging time will be elongated and diode 282 is made just to be turned on after delaying a period of time.Since signal transport unit 284 must
It must wait until that diode 282 could generate coupling signal after turning on, therefore signal reception portion 286 is also after this time is delayed
Coupling signal can just be received and generate overvoltage protection according to this and trigger signal TRI to pwm control circuit 132.It follows that
Pwm control circuit 132 is also that the operation of control power transistor 134 could be penetrated after this time is delayed to reduce output
Voltage VOUT, to carry out overvoltage protection.In other words, in this case, switching power supply device 100 can't be stood
Carry out overvoltage protection and cause outer welding system can not normal operating, but electricity can be just carried out after this time can be delayed
Pressure protection.Certainly, the usual skill of this field changes the resistance value of impedance 220 to adjust, it should be understood that time delay can pass through, and also may be used
It is adjusted through the capacitance for changing energy-storage units 230.
In an embodiment aspect, impedance 210 is coupled to the first end 241 of switch unit 240 and PNP transistor 244
Between emitter-base bandgap grading.Since the circuit operation mode of this embodiment aspect is identical with the mode of operation of circuit shown in Fig. 1, herein just no longer
It repeats.
In conclusion in the excess voltage protection of the present invention, the judging result of voltage sampling unit can be used to reflect
It is because the internal circuit of switching power supply device fails if overvoltage is presented in the output terminal of switching power supply device
It is caused or as caused by outer welding system.Thereby voltage sampling unit can decide whether that switch unit is controlled to carry according to this
For being parallel to the path of impedance, determine it is that electric current to be allowed charges to energy-storage units or allowed by impedance with further
Electric current passage path charges to energy-storage units.And since the resistance value in above-mentioned path is less than the resistance value of the impedance so that storage
Can unit can have two kinds of different charging time under two kinds of different over-voltage conditions, promote signal isolated location at two kinds not
Under same over-voltage condition, the time for generating overvoltage protection triggering signal is also and then different.By such control, the present invention
Excess voltage protection can immediately be generated when the internal circuit of switching power supply device fails overvoltage protection triggering
Signal is postponed when outer welding system causes overvoltage and generated so that switching power supply device to be controlled to carry out overvoltage protection
Voltage protection triggers the time of signal, so that switching power supply device will not carry out overvoltage protection immediately and cause external
System can not normal operating.
Although the present invention is disclosed above with preferred embodiment, however, it is not to limit the invention, any to be familiar with this skill
Skill person, without departing from the spirit and scope of the present invention, when can make a little change and retouch, therefore protection scope of the present invention
When being subject to scope that claim is defined.
Claims (8)
1. a kind of excess voltage protection, suitable for a suitching type power supply device, it is characterised in that including：
One first impedance has one first resistance value；
One second impedance, has one second resistance value, which is more than first resistance value；
One first energy-storage units, its one end couple wherein one end of second impedance, and the other end coupling of the first energy-storage units
Connect one first reference potential；
One switch unit, has a first end, a second end and one the 3rd end, which couples wherein the one of the second impedance
End；
One overvoltage detecting unit couples an output terminal of the switching power supply device, to receive on the output terminal
One output voltage, and whether judge the size of the output voltage more than one first default value is just exporting one just when being judged as YES
Voltage to the switch unit the first end；
One voltage sampling unit has one the 4th end and one the 5th end, and the 5th end couples the 3rd end of the switch unit, should
4th end couples wherein one end of a second siding ring of a transformer, and the voltage exported to detect the second siding ring is
It is no just to turn on the 5th end and first reference potential up to one second default value, and when being judged as YES, and if the overvoltage detect
It surveys unit and exports the positive voltage and then can control electrical path between the switching means conductive first end and the second end；And
One signal isolated location couples the first energy-storage units, second impedance and a pulse width modulating control circuit, and according to this
Voltage swing stored by first energy-storage units triggers signal to decide whether to generate an overvoltage protection, to utilize the overvoltage
Protection triggers signal the pulse width modulating control circuit to be controlled to stop generating a pulse width modulation signal.
2. excess voltage protection as described in claim 1, it is characterised in that wherein one end of first impedance couple this
One energy-storage units, the other end couple the second end of the switch unit.
3. excess voltage protection as described in claim 1, it is characterised in that the first switch unit includes：
There is an emitter-base bandgap grading, a base stage and a collector, the emitter-base bandgap grading to couple the overvoltage and detect for one PNP transistor, the PNP transistor
The output of unit is surveyed, which couples the second end, and the base stage couples the 3rd end；And
One the 3rd impedance, the 3rd impedance coupling is between the 3rd end and the output terminal of the switching power supply device.
4. excess voltage protection as claimed in claim 3, it is characterised in that wherein one end of first impedance couples this and opens
The first end of unit is closed, the other end couples the emitter-base bandgap grading of the PNP transistor.
5. excess voltage protection as described in claim 1, it is characterised in that the overvoltage detecting unit includes：
One bleeder circuit is coupled between the output terminal of the switching power supply device and first reference potential, and according to
A partial pressure signal is generated according to the voltage swing of the output terminal；And
One comparator, negative input end receive one second reference potential, and positive input terminal receives the partial pressure signal, and it exports coupling
Connect the first end of the switch unit and the other end of second impedance.
6. excess voltage protection as described in claim 1, it is characterised in that the voltage sampling unit includes：
One diode, anode couple wherein one end of the second siding ring；
One second energy-storage units are coupled between the cathode of the diode and first reference potential；
One bleeder circuit is coupled between the cathode of the diode and first reference potential, and according to the second energy-storage units
Stored voltage swing and generate a partial pressure signal；And
There is one votage control switch the 5th end, one the 6th end and a reference edge, the 6th end to couple first reference potential, and
The reference edge receives the partial pressure signal, and when the voltage of the reference edge reaches three default value, which just turns on
Path between 5th end and the 6th end.
7. excess voltage protection as described in claim 1, it is characterised in that the signal isolated location includes：
One diode, anode couple the first energy-storage units, second impedance；
One signal transport unit, its one end couples the cathode of the diode, and its other end couples first reference potential, the signal
Transport unit is generating a coupling signal；And
One signal reception portion, its one end couples the pulse width modulating control circuit, and its other end couples one second reference potential, should
Signal reception portion generates overvoltage protection triggering signal according to this to receive the coupling signal.
8. excess voltage protection as claimed in claim 7, it is characterised in that it is a photo-coupler that the signal transport unit, which includes,
A light emitting portion, which comes to generate a light source as the coupling signal, and the signal reception portion include be this
One light receiver of photo-coupler, the light receiver generate be somebody's turn to do according to this to receive the coupling signal that the light source is formed
Overvoltage protection triggers signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611112578.1A CN108123429B (en) | 2016-11-30 | 2016-11-30 | Overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611112578.1A CN108123429B (en) | 2016-11-30 | 2016-11-30 | Overvoltage protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108123429A true CN108123429A (en) | 2018-06-05 |
| CN108123429B CN108123429B (en) | 2019-12-27 |
Family
ID=62227401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611112578.1A Active CN108123429B (en) | 2016-11-30 | 2016-11-30 | Overvoltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108123429B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327182A (en) * | 2018-11-06 | 2019-02-12 | 许昌许继风电科技有限公司 | A kind of DC bus over-pressure safety device, control method and a kind of servo-driver |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11289759A (en) * | 1998-03-31 | 1999-10-19 | Sony Corp | Overvoltage protective circuit |
| US6987378B1 (en) * | 2004-12-02 | 2006-01-17 | Semiconductor Components Industries, L.L.C. | Over-voltage protection circuit and method therefor |
| CN201466986U (en) * | 2009-05-07 | 2010-05-12 | 康舒电子(东莞)有限公司 | Switching power supplying device with function of preventing surging |
| CN202524067U (en) * | 2011-12-17 | 2012-11-07 | 西安恒飞电子科技有限公司 | Input over-voltage and under-voltage protection device of communication power supply module |
| CN103326325A (en) * | 2013-06-05 | 2013-09-25 | 广州凯盛电子科技有限公司 | Short-circuit and low-voltage protective circuit of output of switching power source |
| CN204030996U (en) * | 2014-05-26 | 2014-12-17 | 昂宝电子（上海）有限公司 | A kind of reverse exciting switching voltage regulator circuit |
-
2016
- 2016-11-30 CN CN201611112578.1A patent/CN108123429B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11289759A (en) * | 1998-03-31 | 1999-10-19 | Sony Corp | Overvoltage protective circuit |
| US6987378B1 (en) * | 2004-12-02 | 2006-01-17 | Semiconductor Components Industries, L.L.C. | Over-voltage protection circuit and method therefor |
| CN201466986U (en) * | 2009-05-07 | 2010-05-12 | 康舒电子(东莞)有限公司 | Switching power supplying device with function of preventing surging |
| CN202524067U (en) * | 2011-12-17 | 2012-11-07 | 西安恒飞电子科技有限公司 | Input over-voltage and under-voltage protection device of communication power supply module |
| CN103326325A (en) * | 2013-06-05 | 2013-09-25 | 广州凯盛电子科技有限公司 | Short-circuit and low-voltage protective circuit of output of switching power source |
| CN204030996U (en) * | 2014-05-26 | 2014-12-17 | 昂宝电子（上海）有限公司 | A kind of reverse exciting switching voltage regulator circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327182A (en) * | 2018-11-06 | 2019-02-12 | 许昌许继风电科技有限公司 | A kind of DC bus over-pressure safety device, control method and a kind of servo-driver |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108123429B (en) | 2019-12-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6509658B1 (en) | Device for the automatic shut-off of equipment's stand-by power | |
| US9887580B2 (en) | Emergency lighting device | |
| EP1178591B1 (en) | Power supply device with detection of malfunctioning | |
| CN106505861A (en) | Input in power converter is protected with output over-voltage | |
| CN102685971B (en) | Conversion controller | |
| TWI481140B (en) | Switching power supply circuit and electronic equipment with protection function | |
| CN102647079A (en) | Discharging circuit and power supply | |
| CN106655824B (en) | Switching power supply control circuit and switching power supply | |
| CN102906797A (en) | Dynamic loading of power supplies | |
| US9627983B2 (en) | Circuit suppressing excessive current in startup phase of a voltage converter and method thereof | |
| CN203660911U (en) | Flyback AC-DC converter | |
| CN108123429A (en) | Excess voltage protection | |
| US9954457B2 (en) | Overvoltage protection circuit | |
| CN102299566A (en) | Wireless power receiving device and wireless power transmitting system | |
| TWI614975B (en) | Over-voltage protection circuit | |
| CN107819399B (en) | Overvoltage protection circuit | |
| CN107819398A (en) | Excess voltage protection | |
| KR20150070590A (en) | Circuit for driving synchronous rectifier and power supply apparatus including the same | |
| US10270280B2 (en) | Power receiver having magnetic signature and method for operating same | |
| US11356024B2 (en) | Ignition exciter assembly and method for charging a tank capacitor for an ignition exciter | |
| CN108123422A (en) | Excess voltage protection | |
| US20150084415A1 (en) | On-board charger housekeeping power supply with automatic source transition | |
| JP5335381B2 (en) | Power line carrier communication power failure detection device and power line carrier communication device | |
| WO2017099768A1 (en) | Short circuit protection for data interface charging | |
| KR20150115663A (en) | Load detecting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |