CN105977921B - A kind of isolated power supply overcurrent turn-off function delay protection circuit - Google Patents
A kind of isolated power supply overcurrent turn-off function delay protection circuit Download PDFInfo
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- CN105977921B CN105977921B CN201610472760.1A CN201610472760A CN105977921B CN 105977921 B CN105977921 B CN 105977921B CN 201610472760 A CN201610472760 A CN 201610472760A CN 105977921 B CN105977921 B CN 105977921B
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- power supply
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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
-
- 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
- H02H3/08—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 current
- H02H3/093—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 current with timing means
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
- Semiconductor Integrated Circuits (AREA)
Abstract
The invention discloses a kind of isolated power supply overcurrent turn-off function delay protection circuit, including sample circuit, voltage threshold circuit, charging delay circuit and power supply regulator circuit；Sample circuit uses sampling resistor；Voltage threshold circuit uses metal-oxide-semiconductor；Charging delay circuit includes the 4th resistance, voltage-stabiliser tube and capacitance；Regulator circuit of powering includes power supply transistor；The grid of the termination input of sampling resistor one ground, other end connection power main switch pipe source electrode and metal-oxide-semiconductor；One end of the source electrode of metal-oxide-semiconductor, the anode of voltage-stabiliser tube and capacitance is connected to input ground GND after connecting altogether, the drain electrode of metal-oxide-semiconductor, the cathode of voltage-stabiliser tube, one end of the other end of capacitance and the 4th resistance are connected to the base stage of power supply transistor after connecting altogether, the other end of 4th resistance is connected on the collector of power input voltage and power supply transistor, and the emitter of power supply transistor is connected to the supply voltage of power-supply controller of electric.The circuit of the present invention has simple in structure, at low cost, high reliability.
Description
Technical field
The present invention relates to a kind of isolated power supply overcurrent turn-off function delay protection circuits, belong to field of circuit technology.
Background technology
Isolating switch power current foldback circuit is typically all to be made of sampling resistor, a reference source, comparator and MOS switch
, comparator and a reference source are required for power supply to power, and complicated, and cost is higher；The circuit that some is designed using low-loss
But cost is higher；Some is using control power-supply controller of electric duty cycle, but power supply circuit loss is larger；Some is using control metal-oxide-semiconductor
Carry out shut-off protection, but due to the presence of switching tube conducting resistance, when high current causes the loss of power larger.Such as following application
Number Chinese patent, 201320347931.X, shortcoming：There is control IC chip in circuit, cost is higher；
201420557248.3 shortcoming：There is control IC chip in circuit, cost is higher；201220572956.5 shortcoming：Electricity
Line structure is complicated, and cost is higher；201120508714.5 shortcoming：Circuit structure is complicated, and cost is higher.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of isolated power supply overcurrent turn-off function delay protection circuit, structure letter
Single, at low cost, reliability is high.
In order to solve the above technical problems, the present invention provides a kind of isolated power supply overcurrent turn-off function delay protection circuit, feature
It is, including sample circuit, voltage threshold circuit, charging delay circuit and power supply regulator circuit；
Sample circuit uses sampling resistor；
Voltage threshold circuit uses metal-oxide-semiconductor V1；
Charging delay circuit includes the 4th resistance R4, voltage-stabiliser tube V2With capacitance C1；
Regulator circuit of powering includes power supply transistor V3；
The grid of the termination input of sampling resistor one ground, other end connection power main switch pipe source electrode and metal-oxide-semiconductor；
Metal-oxide-semiconductor V1Source electrode, voltage-stabiliser tube V2Anode and capacitance C1One end connect altogether after be connected to input ground GND, MOS
Pipe V1Drain electrode, voltage-stabiliser tube V2Cathode, capacitance C1The other end and the 4th resistance R4One end connect altogether after be connected to power supply three poles
Pipe V3Base stage, the 4th resistance R4The other end be connected to power input voltage VinWith power supply transistor V3Collector on, power supply
Triode V3Emitter be connected to the supply voltage V of power-supply controller of electricDD1。
Further include 3rd resistor, the termination input ground GND of sampling resistor one, other end connection power main switch pipe source electrode and the
Three resistance R3One end, 3rd resistor R3Other end connection metal-oxide-semiconductor V1Grid.
Sample circuit is by the first sampling resistor R1, the second sampling resistor R2Parallel connection is formed.
Further include one the 5th resistance, the 4th resistance R4The other end be connected to power input voltage VinWith the one of the 5th resistance
End, the other end of the 5th resistance are connected to power supply transistor V3Collector.
Delay opening time t=R*C*ln (V after power supply overcurrent protectionin/(Vin-Vth- 0.7)), R is the 4th electricity in formula
Hinder R4Resistance value, C be capacitance C1Capacitance, VinIt is power input voltage, VthIt is the unlatching threshold voltage of power-supply controller of electric,
0.7V is the base emitter voltage drop of power supply transistor.
The advantageous effect that the present invention is reached：
The present invention opens MOS switch pipe, metal-oxide-semiconductor using voltage on power supply primary side sampling resistor as overcurrent voltage signal
The transistor base of drain connection power supply circuit be powered shut-off to power supply control chip, while power supply circuit signal control
There is delay circuit in part, and the function that delay is opened is played when restarting so as to power supply.This circuit has：It is simple in structure, at low cost, can
By property it is high the advantages that.
Description of the drawings
Fig. 1 is the principle of the present invention block diagram；
Fig. 2 is the circuit diagram of the present invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and be not intended to limit the protection scope of the present invention and limit the scope of the invention.
Principle of the invention block diagram as shown in Figure 1, circuit mainly by sample circuit, voltage threshold circuit, charging delay circuit,
The units such as regulator circuit of powering are formed.
As shown in Fig. 2, sample circuit is sampling resistor R1、R2The parallel circuit that parallel connection is formed.Voltage threshold circuit uses
Metal-oxide-semiconductor V1.Charging delay electricity routing resistance R4, voltage-stabiliser tube V2With capacitance C1It forms.Regulator circuit power by resistance R5With power supply three
Pole pipe V3It forms.
Sampling resistor R1, R2After parallel connection, a termination input ground GND, the other end connects power main switch pipe source electrode and resistance R3
One end, resistance R3Other end connection metal-oxide-semiconductor V1Grid.Metal-oxide-semiconductor V1Source electrode, voltage-stabiliser tube V2Anode and capacitance C1's
One end is connected to input ground GND, metal-oxide-semiconductor V after connecting altogether1Drain electrode, voltage-stabiliser tube V2Cathode, capacitance C1The other end and resistance R4
One end connect altogether after be connected to power supply transistor V3Base stage, resistance R4The other end and resistance R5To be connected to power supply altogether defeated for one end
Enter voltage VinOn, resistance R5The other end be connected to power supply transistor V3Collector, power supply transistor V3Emitter connection
To the supply voltage V of power-supply controller of electricDD1。
Metal-oxide-semiconductor V in the present embodiment1Using NMOS tube.
When flowing through resistance R1With resistance R2When the electric current of the sample circuit of composition reaches the overcurrent protection current values of setting,
Resistance R1And R2Upper voltage just reaches metal-oxide-semiconductor V1The unlatching threshold voltage of the voltage threshold circuit of composition, metal-oxide-semiconductor V1It opens, voltage stabilizing
Pipe V2On voltage instantaneous be reduced to 0V or so, resistance R5With power supply transistor V3The power supply regulator circuit of composition just disconnects, power supply control
The supply voltage V of device processedDD1It begins to decline, when dropping to the shut-off threshold voltage of power-supply controller of electric, power supply is stopped,
Isolation output voltage numerical value is just reduced to 0V, because power supply is stopped, so flowing through resistance R1And R2On voltage begin to decline,
When being reduced to metal-oxide-semiconductor V1Shutoff door prescribe a time limit, metal-oxide-semiconductor V1It disconnects, input voltage VinPass through resistance R4Start to capacitance C1It charges, when
When voltage is charged to the unlatching threshold voltage of power-supply controller of electric, power supply is started to work again.
It is t that if power supply, which stops to the time interval of start-up operation, then t=R*C*ln (Vin/(Vin-Vth- 0.7)), that is,
The delay opening time after power supply overcurrent protection, R is resistance R in formula4Resistance value, C be capacitance C1Capacitance, VinIt is that power supply is defeated
Enter voltage, VthIt is the unlatching threshold voltage of power-supply controller of electric, 0.7V is the base emitter voltage drop of power supply circuit triode.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (5)
1. a kind of isolated power supply overcurrent turn-off function delay protection circuit, it is characterized in that, including sample circuit, voltage threshold circuit, fill
Electrical delay circuit and power supply regulator circuit；
Sample circuit uses sampling resistor；
Voltage threshold circuit uses metal-oxide-semiconductor V1；
Charging delay circuit includes the 4th resistance R4, voltage-stabiliser tube V2With capacitance C1；
Regulator circuit of powering includes power supply transistor V3；
The termination input of sampling resistor one ground, other end connection power main switch pipe source electrode and metal-oxide-semiconductor V1Grid；
Metal-oxide-semiconductor V1Source electrode, voltage-stabiliser tube V2Anode and capacitance C1One end connect altogether after be connected to input ground GND, metal-oxide-semiconductor V1's
Drain electrode, voltage-stabiliser tube V2Cathode, capacitance C1The other end and the 4th resistance R4One end connect altogether after be connected to power supply transistor V3's
Base stage, the 4th resistance R4The other end be connected to power input voltage VinWith power supply transistor V3Collector on, power three poles
Pipe V3Emitter be connected to the supply voltage V of power-supply controller of electricDD1。
2. a kind of isolated power supply overcurrent turn-off function delay protection circuit according to claim 1, it is characterized in that, further include the 3rd
Resistance, the termination input ground GND of sampling resistor one, other end connection power main switch pipe source electrode and 3rd resistor R3One end,
Three resistance R3Other end connection metal-oxide-semiconductor V1Grid.
3. a kind of isolated power supply overcurrent turn-off function delay protection circuit according to claim 1, it is characterized in that, sample circuit by
First sampling resistor R1, the second sampling resistor R2Parallel connection is formed.
4. a kind of isolated power supply overcurrent turn-off function delay protection circuit according to claim 1, it is characterized in that, further include one
Five resistance, the 4th resistance R4The other end be connected to power input voltage VinWith one end of the 5th resistance, the 5th resistance it is another
End is connected to power supply transistor V3Collector.
5. a kind of isolated power supply overcurrent turn-off function delay protection circuit according to claim 1, it is characterized in that, power supply overcurrent is protected
Delay opening time t=R*C*ln (V after shieldin/(Vin-Vth- 0.7)), R is the 4th resistance R in formula4Resistance value, C be capacitance C1
Capacitance, VinIt is power input voltage, VthIt is the unlatching threshold voltage of power-supply controller of electric, 0.7V is that the base of power supply transistor is penetrated
Extreme pressure drops.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610472760.1A CN105977921B (en) | 2016-06-27 | 2016-06-27 | A kind of isolated power supply overcurrent turn-off function delay protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610472760.1A CN105977921B (en) | 2016-06-27 | 2016-06-27 | A kind of isolated power supply overcurrent turn-off function delay protection circuit |
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| Publication Number | Publication Date |
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| CN105977921A CN105977921A (en) | 2016-09-28 |
| CN105977921B true CN105977921B (en) | 2018-06-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112636314A (en) * | 2020-12-08 | 2021-04-09 | 杭州和利时自动化有限公司 | Current-limiting protection circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102842885A (en) * | 2011-06-22 | 2012-12-26 | 富泰华工业（深圳）有限公司 | Protecting circuit and electronic device with same |
| CN103414163A (en) * | 2013-08-26 | 2013-11-27 | 中国兵器工业集团第二一四研究所苏州研发中心 | Direct-current power supply output overcurrent protection device |
| CN105514942A (en) * | 2014-09-05 | 2016-04-20 | 纬创资通股份有限公司 | protection method and protection device for electronic device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130070379A1 (en) * | 2011-09-21 | 2013-03-21 | Richtek Technology Corporation, R.O.C. | Power regulator with over current protection and control circuit thereof and method of over current protection |
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2016
- 2016-06-27 CN CN201610472760.1A patent/CN105977921B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102842885A (en) * | 2011-06-22 | 2012-12-26 | 富泰华工业（深圳）有限公司 | Protecting circuit and electronic device with same |
| CN103414163A (en) * | 2013-08-26 | 2013-11-27 | 中国兵器工业集团第二一四研究所苏州研发中心 | Direct-current power supply output overcurrent protection device |
| CN105514942A (en) * | 2014-09-05 | 2016-04-20 | 纬创资通股份有限公司 | protection method and protection device for electronic device |
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| CN105977921A (en) | 2016-09-28 |
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Effective date of registration: 20180813 Address after: 233030 2016 Tang He road, Bengbu, Anhui Patentee after: Huadong Photoelectric Integrated Device Research Institute Address before: 215163 No. 89 Longshan Road, Suzhou high tech Zone, Suzhou, Jiangsu Patentee before: China North Industries Group Corporation No.214 Research Institute Suzhou R&D Center |