CN109361195A - A kind of protection circuit against input over-voltage and power-supply system - Google Patents
A kind of protection circuit against input over-voltage and power-supply system Download PDFInfo
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- CN109361195A CN109361195A CN201811191573.1A CN201811191573A CN109361195A CN 109361195 A CN109361195 A CN 109361195A CN 201811191573 A CN201811191573 A CN 201811191573A CN 109361195 A CN109361195 A CN 109361195A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of protection circuit against input over-voltage and power-supply systems; it can be protected under abnormal input condition for power-supply system; it prevents as inputting over-voltage damage caused by power-supply system; failure rate of the power-supply system under abnormal input condition is greatly reduced, to improve the reliability of power-supply system.
Description
Technical field
The present invention relates to power technique fields more particularly to a kind of protection circuit against input over-voltage and power-supply systems.
Background technique
Power-supply system is generally used in many electronic equipments, to provide the electric power suitably operated for electronic equipment.
Power-supply system generally comprises the electronics such as rectifier bridge, controller, transformer, power switch, resistor, diode and capacitor member
Part.
For ac/dc (AC/DC) power-supply system, input voltage is the alternating current of power grid output.And power grid is different
In normal situation (such as thunder and lightning weather), the voltage for the input voltage range that one is more than power-supply system may be exported (that is, power supply
The input voltage of system is in overvoltage condition).Due to the electronic component (e.g., rectifier bridge etc.) inside power-supply system have it is certain
Pressure-resistant range will lead to member inside power-supply system if the input voltage of power-supply system works long hours under this overvoltage condition
Part damages power-supply system because over-voltage is breakdown.If element is breakdown to cause short circuit, can to generate in circuit very big
Electric current, may result in that component temperature is excessively high and on fire to burn power-supply system when serious, or even fire occurs.
Therefore, failure rate of the power-supply system under abnormal input condition is reduced, so that the reliability of power-supply system is improved, at
For technical problem urgently to be resolved.
Summary of the invention
The object of the present invention is to provide a kind of protection circuit against input over-voltage and power-supply systems, can exist for power-supply system
It is protected under abnormal input condition, prevents from reducing power-supply system different as inputting over-voltage damage caused by power-supply system
Failure rate under normal input condition, to improve the reliability of power-supply system.
To achieve the above object, the present invention provides a kind of protection circuit against input over-voltage, are suitable for power-supply system, the electricity
Source system includes controller and transformer；The protection circuit against input over-voltage include the second power supply unit, partial pressure unit and
Switch unit；Second power supply unit is electrically connected the transformer and the switch unit, and second power supply is single
Member receives one second boost voltage that is exported by the transformer according to the input voltage of the power-supply system, and described the
When two boost voltages are more than or equal to predeterminated voltage safety value, the second supply voltage of output starts the switch unit；The partial pressure
Unit is electrically connected second power supply unit and the switch unit, for exporting to second power supply unit
Two supply voltages input the switch unit after being divided；The switch unit is electrically connected to the controller, for opening
Second supply voltage is exported when dynamic to the controller, closes the control to cause the overvoltage protection of the controller
Device.
To achieve the above object, the present invention also provides a kind of power-supply systems, including rectification filtering unit, controller, change
Depressor, the first power supply unit, power switch tube and output unit；The transformer is electrically connected the rectification filtering unit, institute
Stating transformer includes armature winding, secondary windings and the first auxiliary winding, and the armature winding is electrically connected the power switch,
The secondary windings is electrically connected the output unit, and first auxiliary winding is electrically connected first power supply unit；Described
One power supply unit receives one first boost voltage of the first auxiliary winding output, and exports the first supply voltage to the control
Device processed；The controller is further electrically connected the power switch；The power-supply system further comprises input overvoltage protection electricity
Road, the transformer further comprise the second auxiliary winding, second auxiliary winding and the armature winding be Same Name of Ends around
Group；The protection circuit against input over-voltage is electrically connected to second auxiliary winding to receive second boost voltage, and in institute
When stating the second boost voltage more than or equal to predeterminated voltage safety value, the second supply voltage of output to the controller, described in initiation
The overvoltage protection of controller and close the controller.
It is an advantage of the current invention that protection circuit against input over-voltage of the present invention and power-supply system, it can be for power-supply system different
It is protected under normal input condition, prevents from greatly reducing power-supply system as inputting over-voltage damage caused by power-supply system
Failure rate under abnormal input condition, to improve the reliability of power-supply system.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those skilled in the art, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1, the architecture diagram of protection circuit against input over-voltage of the present invention；
Fig. 2, the circuit diagram of one embodiment of protection circuit against input over-voltage of the present invention；
Fig. 3, the circuit diagram of one embodiment of power-supply system of the present invention；
Fig. 4, the work flow diagram of one embodiment of power-supply system of the present invention.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.This
Outside, present invention repeat reference numerals and/or reference letter in different examples, this repetition are for simplified and clear mesh
, the relationship between discussed various embodiments and/or setting itself is not indicated.
Protection circuit against input over-voltage of the present invention, by receive power-supply system transformer winding in it is increased second auxiliary around
Second boost voltage caused by group, and when the second boost voltage is more than or equal to predeterminated voltage safety value, the second power supply of output
Voltage causes the overvoltage protection of controller and closes controller, controller stops working, power supply system to the controller of power-supply system
System prevents from damaging power-supply system due to input over-voltage without output.That is, if the input voltage of power-supply system is due to certain
When reason increases suddenly and is more than set voltage security value range (power-supply system is in abnormal input), the input
Voltage protection circuit work, so that controller stops working, power-supply system substantially reduces power-supply system and is inputting item extremely without output
Failure rate under part, to improve the reliability of power-supply system.
With reference to Fig. 1, the architecture diagram of protection circuit against input over-voltage of the present invention.The protection circuit against input over-voltage 10 is applicable in
In power-supply system, the power-supply system includes controller 12 and transformer T1.The protection circuit against input over-voltage 10 includes the
Two power supply units 101, partial pressure unit 102 and switch unit 103；Second power supply unit 101 is electrically connected the transformer
T1 and the switch unit 103, second power supply unit 101 are received by the transformer T1 according to the power-supply system
Input voltage and the one second boost voltage U3 exported, and it is more than or equal to predeterminated voltage safety value in the second boost voltage U3
When U0, the second supply voltage of output starts the switch unit 103；The partial pressure unit 102 is electrically connected described second and supplies
Electric unit 101 and the switch unit 103, the second supply voltage for exporting to second power supply unit 101 carry out
The switch unit 103 is inputted after partial pressure；The switch unit 103 is electrically connected to the controller 12, for defeated on startup
Second supply voltage closes the controller to the controller 12 to cause the overvoltage protection of the controller 12 out
12.Controller 12 stops working, and power-supply system prevents from damaging power-supply system due to input over-voltage without output.
With reference to Fig. 2, the circuit diagram of one embodiment of protection circuit against input over-voltage of the present invention.
In the present embodiment, second power supply unit 101 includes third diode D8 and the second capacitor C8.Three or two
The anode of pole pipe D8 is electrically connected to the one second auxiliary winding n3 of the transformer T1 to receive the second boost voltage U3, and
Its cathode is electrically connected the switch unit 103 and by the second capacitor C8 ground connection (GND).Second capacitor C8 in the present embodiment
Capacitance be 10 μ F.Wherein, the armature winding n1 (being not shown in the drawing) of the second auxiliary winding n3 and transformer T1 be Same Name of Ends around
Group can be with predeterminated voltage safety value described in flexible setting by adjusting the number of turns of the second auxiliary winding n3.
In the present embodiment, the partial pressure unit 102 includes the first divider resistance R11 and the second divider resistance R15.First
The first end of divider resistance R11 is electrically connected the second power supply unit 101, and its second end is electrically connected the of the second divider resistance R15
One end；The second end of second divider resistance R15 is grounded；The common end of first divider resistance R11 and the second divider resistance R15
C is electrically connected to switch unit 103.The resistance value of the first divider resistance R11 and the second divider resistance R15 are respectively in the present embodiment
39K and 1K.Preferably, it by adjusting the intrinsic standoff ratio of the first divider resistance R11 and the second divider resistance R15, can flexibly set
Set the predeterminated voltage safety value.
In the present embodiment, the switch unit 103 includes the second triode Q2, third transistor Q3 and the 4th diode
D9.The emitter lotus root of second triode Q2 is connected to the second power supply unit 101, and collector is electrically connected the sun of the 4th diode D9
Pole, and its base stage lotus root is connected to the collector of third transistor Q3.The cathode of 4th diode D9 is electrically connected to the VCC of controller 12
Feeder ear.The emitter of third transistor Q3 is grounded, and its base stage lotus root is connected to partial pressure unit 102.It is big in the second boost voltage U3
When being equal to predeterminated voltage safety value U0, the second power supply unit 101 exports the second supply voltage, the second triode Q2 of control, the
Three triode Q3 and the 4th diode D9 conducting, to export the VCC feeder ear of the second supply voltage to controller 12, to cause
The overvoltage protection of controller 12 and close controller 12.Controller 12 stops working, and power-supply system is prevented without output due to input
Over-voltage damages power-supply system.The second triode Q2 is positive-negative-positive transistor, third transistor Q3 in the present embodiment
For negative-positive-negative transistor.
Preferably, the emitter of the second triode Q2 further passes through a second resistance R8 and is electrically connected to the second power supply unit
101, collector further passes through the base stage that a 3rd resistor R9 is electrically connected to its own, and base stage further passes through one the 4th
Resistance R12 is electrically connected to the collector of third transistor Q3.The base stage of third transistor Q3 further passes through one the 5th resistance R13
Partial pressure unit 103 is electrically connected to (specifically, being electrically connected to the public of the first divider resistance R11 and the second divider resistance R15
Hold C) and be grounded by a third capacitor C7.In the present embodiment, second resistance R8,3rd resistor R9, the 4th resistance R12 and
The resistance value of 5th resistance R13 is respectively 4.7R, 1K, 1K and 1K；The capacitance of third capacitor C7 is 1 μ F.
Protection circuit against input over-voltage of the present invention can be protected under abnormal input condition for power-supply system, prevent by
It is damaged caused by power-supply system in input over-voltage, greatly reduces failure rate of the power-supply system under abnormal input condition, from
And improve the reliability of power-supply system.
With reference to Fig. 3, the circuit diagram of one embodiment of power-supply system of the present invention.The power-supply system includes rectification filtering unit
31, controller 32, transformer T1, the first power supply unit 33, power switch tube Q1 and output unit 34.The transformer T1 electricity
The rectification filtering unit 31 is connected, the transformer T1 includes armature winding n1, secondary windings n4 and the first auxiliary winding
N2, the armature winding n1 are electrically connected the power switch Q1, and the secondary windings n4 is electrically connected the output unit 34, described
First auxiliary winding n2 is electrically connected first power supply unit 33；It is defeated that first power supply unit 33 receives the first auxiliary winding n2
One first boost voltage U2 out, and the first supply voltage is exported to the controller 32；The controller 32 is further electrically connected
Meet the power switch Q1.The power-supply system further comprises protection circuit against input over-voltage 35, and the transformer T1 is further
It is Same Name of Ends winding including the second auxiliary winding n3, the second auxiliary winding n3 and the armature winding n1.It is described to input
Voltage protection circuit 35 is electrically connected to the second auxiliary winding n3 to receive the second boost voltage U3, and auxiliary described second
When voltage U3 being helped to be more than or equal to predeterminated voltage safety value U0, the second supply voltage is exported to the controller 32, causes the control
The overvoltage protection of device 32 processed and close the controller 32.Controller 32 stops working, and power-supply system is prevented without output due to defeated
Enter over-voltage to damage power-supply system.
Preferably, by adjusting the number of turns of the second auxiliary winding n3, or by adjust the first divider resistance R11 with
The intrinsic standoff ratio of second divider resistance R15, can be with predeterminated voltage safety value described in flexible setting.
Preferably, the protection circuit against input over-voltage 35 protection circuit against input over-voltage above-mentioned using the present invention, it is specific to join
According to shown in Fig. 1, Fig. 2, repeated description no longer is carried out to the structure of the protection circuit against input over-voltage and function herein.
Preferably, the controller is using PWM (Pulse Width Modulation, pulse width modulation) control chip
(PWM IC), the peripheral circuit of PWM IC include resistance R1 (1.2M), R2 (1.2M), capacitor C5 (1nF), C6 (10 μ F), direct current
Electric current pick-up Table I C1B (access of 3,4 terminals) and voltage-stabiliser tube ZD1 (burning voltage 30V), the connection type of element are this field
Interior conventional arrangement, details are not described herein again.
Specifically, the rectification filtering unit 31 includes the rectifier bridge and filtered electrical of four diode D1, D3-D5 compositions
Hold C2 (100 μ F/450V), the connection type of element is conventional arrangement in the art, and details are not described herein again.
Specifically, power switch Q1 (10N60) drain electrode is electrically connected to armature winding n1, source electrode passes through a resistance R6
(1.2R) ground connection, grid are electrically connected to the port Gate of PWM IC.
Specifically, first power supply unit 33 includes first diode D6, the second diode D7 and first capacitor C3
(10μF).First diode D6, anode are electrically connected to the first auxiliary winding n2 of the transformer T1 to receive the first auxiliary electricity
U23 is pressed, cathode is electrically connected the anode of the second diode D7 by a resistance R4 (10R) while is grounded by first capacitor C3.The
The cathode of two diode D7 is electrically connected to the VCC feeder ear of PWM IC.
Specifically, the output unit 34 include diode D2, capacitor C1 (220 μ F), C4 (0.1 μ F), resistance R3 (1K),
R7 (1K), R5 (18K), R10 (10K), R14 (4.64K), DC current pick-up Table I C1B (access of 1,2 terminals) and triode
The connection type of Q11 (AZ431), element are conventional arrangement in the art, and details are not described herein again.
When power-supply system works normally, after the rectified filtering of input voltage Uac of power-supply system, in the n1 of transformer T1,
The voltage that n2, n3 winding terminal generate is respectively U1, U2, U3.It can by the turn ratio of the Same Name of Ends winding relationship directly proportional to voltage
Know, N1/N3=U1/U3.The condition of triode Q3 conducting has not yet been reached in voltage U3=(N3*U1)/N1 that n3 winding generates at this time,
Then triode Q3, Q2, diode D9 are not turned on, and protection circuit against input over-voltage of the present invention does not work, and PWM IC is in n2 winding at this time
Power supply under work normally, diode D6, D7 conducting, power-supply system output voltage V0.
When power-supply system abnormal work, Uac increases at this time, and due to U1=1.14*Uac, therefore U1 increases, and similarly U3 also increases
Greatly, when U3 is more than or equal to predeterminated voltage safety value, diode D8 conducting, triode Q3, Q2 are connected, and diode D9 is also switched on.
At this time since in the both ends diode D7, B point voltage is higher than A point voltage, therefore diode D7 ends, the present invention inputs overvoltage protection electricity
Road is started to work, and PWM IC is by n3 winding power.Since the voltage U3 for giving the VCC feeder ear (pin) of PWM IC to power at this time is super
The maximum input voltage of VCC feeder ear is crossed, and PWM IC is made to stop working due to overvoltage protection, power-supply system is without output.
Power-supply system of the present invention, by increasing by an auxiliary winding n3 in transformer winding and increasing input overvoltage protection
Circuit and power-supply system can be protected under abnormal input condition for power-supply system, prevent since input over-voltage is to power supply
It is damaged caused by system, failure rate of the power-supply system under abnormal input condition is greatly reduced, to improve power-supply system
Reliability.
Please also refer to Fig. 3-4, wherein Fig. 4 is the work flow diagram of one embodiment of power-supply system of the present invention.Assuming that Uac >
When=260V, over-voltage and the turn ratio N1:N3=92:7 of armature winding n1 and the second auxiliary winding n3 are inputted.Then work as Uac=
When 260V, U1=368V, U3=(N3*U1)/N1=28V.Therefore, the overvoltage protection voltage of the VCC feeder ear of PWM IC is set
(predeterminated voltage safety value) is 28V.
Normal operating conditions: as input voltage Uac < 260V, i.e. U1 < 368V；By the relationship N1:N3 of turn ratio and voltage
=U1:U3 is it is found that U3=(N3*U1)/N1 < 28V, C point voltage Uc=U3*R15/ (R11+ in protection circuit against input over-voltage 35
R15)<0.7V, triode Q2, Q3 and diode D9 are not turned on, and UA>UB, protection circuit against input over-voltage 35 does not work；PWM IC
VCC feeder ear worked normally under the action of the voltage U2 of n2 winding, diode D6, D7 conducting, power-supply system output voltage
V0。
Abnormal work situation (input over-voltage): as input voltage Uac > 260V, i.e. U1 > 368V；By above-mentioned turn ratio with
The relationship analysis of voltage is it is found that U3 > 28V, Uc > 0.7V, triode Q2, Q3 and diode D9 conducting, UB > UA, diode D7
Cut-off, protection circuit against input over-voltage 35 work；The VCC feeder ear of PWM IC is powered by the voltage U3 of n3 winding at this time, and voltage
U3 is more than the maximum input voltage (i.e. predeterminated voltage safety value 28V) of the VCC feeder ear of PWM IC, to cause the mistake of PWM IC
Pressure is protected and is stopped working, and power supply is without output.
It, can any flexible setting input overvoltage protection by adjusting the number of turns of auxiliary winding n3 or the intrinsic standoff ratio of R11 and R15
Predeterminated voltage safety value.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (10)
1. a kind of protection circuit against input over-voltage is suitable for power-supply system, the power-supply system includes controller and transformer；Its
It is characterized in that, the protection circuit against input over-voltage includes the second power supply unit, partial pressure unit and switch unit；
Second power supply unit is electrically connected the transformer and the switch unit, and second power supply unit receives
One second boost voltage exported by the transformer according to the input voltage of the power-supply system, and in second auxiliary
When voltage is more than or equal to predeterminated voltage safety value, the second supply voltage of output starts the switch unit；
The partial pressure unit is electrically connected second power supply unit and the switch unit, for second power supply
Second supply voltage of unit output inputs the switch unit after being divided；
The switch unit is electrically connected to the controller, for exporting second supply voltage on startup to the control
Device closes the controller to cause the overvoltage protection of the controller.
2. protection circuit against input over-voltage as described in claim 1, which is characterized in that second power supply unit includes the three or two
Pole pipe and the second capacitor；
The anode of the third diode is electrically connected to one second auxiliary winding of the transformer to receive second auxiliary
Voltage, and its cathode is electrically connected the switch unit and passes through second capacity earth；
Wherein, the armature winding of second auxiliary winding and the transformer is Same Name of Ends winding.
3. protection circuit against input over-voltage as described in claim 1, which is characterized in that the partial pressure unit includes the first partial pressure electricity
Resistance and the second divider resistance；
The first end of first divider resistance is electrically connected second power supply unit, and its second end is then electrically connected described second
The first end of divider resistance；
The second end of second divider resistance is grounded；
The common end of first divider resistance and second divider resistance is electrically connected to the switch unit.
4. protection circuit against input over-voltage as claimed in claim 3, which is characterized in that by adjust first divider resistance with
The predeterminated voltage safety value is arranged in the intrinsic standoff ratio of second divider resistance.
5. protection circuit against input over-voltage as described in claim 1, which is characterized in that the switch unit includes the two or three pole
Pipe, third transistor and the 4th diode；
The emitter lotus root of second triode is connected to second power supply unit, and collector is electrically connected the 4th diode
Anode, and its base stage lotus root is connected to the collector of the third transistor；
The cathode of 4th diode is electrically connected to the VCC feeder ear of the controller；
The emitter of the third transistor is grounded, and base stage lotus root is connected to the partial pressure unit；
When second boost voltage is more than or equal to the predeterminated voltage safety value, the second power supply unit output second is supplied
Piezoelectric voltage controls second triode, the third transistor and the 4th diode current flow, is supplied with exporting described second
Piezoelectric voltage to the controller VCC feeder ear, to cause the overvoltage protection of the controller and close the controller.
6. protection circuit against input over-voltage as claimed in claim 5, which is characterized in that
The emitter of second triode further passes through a second resistance and is electrically connected to second power supply unit, current collection
Base stage is further extremely electrically connected to by a 3rd resistor, base stage further passes through one the 4th resistance and is electrically connected to the third
The collector of triode；
The base stage of the third transistor further passes through one the 5th resistance and is electrically connected to the partial pressure unit and by a third
Capacity earth.
7. a kind of power-supply system, including rectification filtering unit, controller, transformer, the first power supply unit, power switch tube and
Output unit；The transformer is electrically connected the rectification filtering unit, the transformer include armature winding, secondary windings and
First auxiliary winding, the armature winding are electrically connected the power switch, and the secondary windings is electrically connected the output unit, institute
It states the first auxiliary winding and is electrically connected first power supply unit；First power supply unit receives the first auxiliary winding output
One first boost voltage, and export the first supply voltage to the controller；The controller is further electrically connected the function
Rate switch；It is characterized in that, the power-supply system further comprises protection circuit against input over-voltage, the transformer further comprises
Second auxiliary winding, second auxiliary winding and the armature winding are Same Name of Ends winding；
The protection circuit against input over-voltage is electrically connected to second auxiliary winding to receive second boost voltage, and in institute
When stating the second boost voltage more than or equal to predeterminated voltage safety value, the second supply voltage of output to the controller, described in initiation
The overvoltage protection of controller and close the controller.
8. power-supply system as claimed in claim 7, which is characterized in that the protection circuit against input over-voltage uses such as claim
Protection circuit against input over-voltage described in 1-6 any one.
9. power-supply system as claimed in claim 7, which is characterized in that by adjusting the number of turns of second auxiliary winding, if
Set the predeterminated voltage safety value.
10. power-supply system as claimed in claim 7, which is characterized in that the controller uses pwm chip.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811191573.1A CN109361195A (en) | 2018-10-12 | 2018-10-12 | A kind of protection circuit against input over-voltage and power-supply system |
| PCT/CN2018/115476 WO2020073418A1 (en) | 2018-10-12 | 2018-11-14 | Input overvoltage protection circuit and power source system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811191573.1A CN109361195A (en) | 2018-10-12 | 2018-10-12 | A kind of protection circuit against input over-voltage and power-supply system |
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| Publication Number | Publication Date |
|---|---|
| CN109361195A true CN109361195A (en) | 2019-02-19 |
Family
ID=65349167
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811191573.1A Pending CN109361195A (en) | 2018-10-12 | 2018-10-12 | A kind of protection circuit against input over-voltage and power-supply system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109361195A (en) |
| WO (1) | WO2020073418A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112704A (en) * | 2019-06-19 | 2019-08-09 | 欣旺达电子股份有限公司 | Accessory power supply over under-voltage protection circuit |
| CN110572021A (en) * | 2019-10-18 | 2019-12-13 | 广州视源电子科技股份有限公司 | Overvoltage protection circuit, method and electric equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02114858A (en) * | 1988-10-22 | 1990-04-26 | Nippon Chemicon Corp | Overvoltage protection circuit |
| JP2009189103A (en) * | 2008-02-04 | 2009-08-20 | Nichicon Corp | Switching power supply device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201499348U (en) * | 2009-08-18 | 2010-06-02 | 重庆师范大学 | LED illumination driving circuit with wide load and high efficiency |
| CN201860084U (en) * | 2010-10-29 | 2011-06-08 | 东莞市百力达光电科技有限公司 | Short-circuit protection circuit of single-stage power factor correction circuit |
| CN202282743U (en) * | 2011-09-29 | 2012-06-20 | 南京博兰得电子科技有限公司 | Resonant converter control device |
| CN102403697B (en) * | 2011-10-27 | 2016-05-04 | 康佳集团股份有限公司 | A kind of Switching Power Supply over-voltage over-current protection circuit and guard method |
-
2018
- 2018-10-12 CN CN201811191573.1A patent/CN109361195A/en active Pending
- 2018-11-14 WO PCT/CN2018/115476 patent/WO2020073418A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02114858A (en) * | 1988-10-22 | 1990-04-26 | Nippon Chemicon Corp | Overvoltage protection circuit |
| JP2009189103A (en) * | 2008-02-04 | 2009-08-20 | Nichicon Corp | Switching power supply device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112704A (en) * | 2019-06-19 | 2019-08-09 | 欣旺达电子股份有限公司 | Accessory power supply over under-voltage protection circuit |
| CN110572021A (en) * | 2019-10-18 | 2019-12-13 | 广州视源电子科技股份有限公司 | Overvoltage protection circuit, method and electric equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020073418A1 (en) | 2020-04-16 |
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Application publication date: 20190219 |