CN109104079A - A kind of preventing reverse connection for DC power source soft-start circuit and implementation method - Google Patents
A kind of preventing reverse connection for DC power source soft-start circuit and implementation method Download PDFInfo
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- CN109104079A CN109104079A CN201811209419.2A CN201811209419A CN109104079A CN 109104079 A CN109104079 A CN 109104079A CN 201811209419 A CN201811209419 A CN 201811209419A CN 109104079 A CN109104079 A CN 109104079A
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- effect tube
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000005669 field effect Effects 0.000 claims abstract description 39
- 239000003990 capacitor Substances 0.000 claims abstract description 31
- 230000000694 effects Effects 0.000 claims abstract description 15
- 230000015556 catabolic process Effects 0.000 claims abstract description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
- H02M1/344—Active dissipative snubbers
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The present invention relates to a kind of preventing reverse connection for DC power source soft-start circuit and implementation methods, when input power polarity is correct, resistance R1 provides positive bias VT1 to field-effect tube VT1 with the partial pressure of resistance R3 and is connected, power supply is the load supplying of back, the grid for the partial pressure breakdown VT1 that zener diode VD1 is R1 and R3 when preventing input voltage excessively high；When input power polarity connection inverse time, the partial pressure of R1 and R3 provide back bias voltage to VT1, and VT1 cut-off, power supply is not the load supplying of back, prevents subsequent load from burning because polarity of voltage is reversed；The series circuit of resistance R4 and resistance R5 and resistance R6 and capacitor C2 provides bias voltage for field-effect tube VT2, due to the charge effects of C2, voltage on VT2 grid slowly rises, so that the conducting resistance between VT2 source drain is gradually reduced, to inhibit power supply to the rush of current at load power-up initial stage, soft start function is realized.
Description
Technical field
The present invention relates to electronic circuit fields, it particularly relates to a kind of preventing reverse connection for DC power source soft-start circuit and reality
Existing method is that a kind of electronic circuit prevents DC power supply error-polarity connection from easing up slow start circuit and control method.
Background technique
There is quite a few electronic circuit to power in actual life using DC power supply, such as battery charger, LED illumination
Driving and the power supply of mobile communication equipment of lamp etc., if these electronic equipments do not protect circuit, in external direct current power supply pole
Property it is reversed in the case where easily burn, so there is an urgent need to these electronic equipments install additional reverse connection prevention protection circuit, avoid direct current
The reversed bring damage of source polarity, while the high reliability request of electronic equipment should also avoid biggish dash current, because
Big dash current close to the power limit of some components in even more than electronic equipment, reduces electronic equipment sometimes
Service life.
The reverse-connection preventing circuit generallyd use now is the full-bridge circuit of single diode circuit or diode composition, these electricity
Though road can prevent external dc power supply polarity reversed, biggish direct current pressure drop is brought simultaneously, reduces complete machine working efficiency, such as
Fruit electronic equipment power consumption is larger, and the electric current for flowing through diode is larger, it is also necessary to solve heat dissipation problem.
Summary of the invention
Situation and existing deficiency in view of the prior art, the present invention provides a kind of preventing reverse connection for DC power source delay startup electricity
Road and implementation method.
The purpose of the present invention is for most of circuit for using direct current supply, providing one kind prevents DC voltage polarity from connecing
Wrong circuit, the circuit can both provide polarity of voltage reversed protection, and big pressure drop will not be brought to circuit or is generated big
Power consumption.Big, the big problem of power consumption for the generally existing pressure drop of existing direct current reverse-connection preventing circuit, present invention mainly solves ask
Topic is to reduce the pressure drop and power consumption of reverse-connection preventing circuit, reduces dash current when device power.
The present invention to achieve the above object, the technical solution adopted is that: a kind of preventing reverse connection for DC power source soft-start circuit,
Be characterized in that: including reverse-connection preventing circuit and soft-start circuit, the reverse-connection preventing circuit includes field-effect tube VT1, resistance R1, resistance
R2, resistance R3, capacitor C1, zener diode VD1, it is specific to connect are as follows: resistance R1 mono- terminates positive pole, another terminating resistor
The cathode of R2, one end of resistance R3 and capacitor C1 anode and zener diode VD1, another termination field-effect tube VT1's of resistance R2
Grid, the drain electrode of VT1 connect input power cathode, and the source electrode of VT1 connects the other end of capacitor C1 cathode and resistance R3, zener diode
VD1 anode；
The soft-start circuit includes effect pipe VT2 and resistance R4, resistance R5, resistance R6, capacitor C2, diode VD2, pressure stabilizing two
Pole pipe VD3, it is specific to connect are as follows: resistance R4 mono- terminates positive pole, one end and two of another terminating resistor R5 of resistance R4, resistance R6
The cathode of pole pipe VD2 anode and zener diode VD3, the grid of another termination field-effect tube VT2 of resistance R5, field-effect tube
The source electrode of VT2 connects the source electrode of zener diode VT1 and the anode of zener diode VD3, and it is defeated that the drain electrode of field-effect tube VT2 connects power supply
Cathode out, the cathode of diode VD2 connect the cathode of zener diode VD1, one end another termination capacitor C2 of resistance R6, capacitor
The cathode of another termination power output of C2, the indirect capacitor C3 of the positive and negative anodes of power supply output.
A kind of implementation method of preventing reverse connection for DC power source soft-start circuit, which is characterized in that steps are as follows:
Entire circuit is divided into 2 parts: reverse-connection preventing circuit and soft-start circuit；
The course of work of reverse-connection preventing circuit are as follows: when input power polarity is correct, the partial pressure of resistance R1 and resistance R3 are to field-effect
Pipe VT1 provides positive bias, field-effect tube VT1 conducting, and power supply is the load supplying of back, and zener diode VD1 is to prevent from inputting
The grid of the partial pressure breakdown VT1 of resistance R1 and resistance R3 when overtension, the effect of capacitor C1 is to filter out spike and interference,
The effect of R2 is current limliting；When input power polarity connection inverse time, the partial pressure of resistance R1 and resistance R3 provide negative to field-effect tube VT1
Bias, field-effect tube VT1 cut-off, power supply is not the load supplying of back, prevent subsequent load because polarity of voltage is reversed and
It burns；
The course of work of soft-start circuit are as follows: the series circuit of resistance R4 and resistance R5 and resistance R6 and capacitor C2 is field-effect
Pipe VT2 provides bias voltage, and due to the charge effects of capacitor C2, the voltage on field-effect tube VT2 grid slowly rises, so that field
Conducting resistance between effect pipe VT2 source drain is gradually reduced, to inhibit power supply to the electric current punching at load power-up initial stage
It hits, realizes soft start function.
The beneficial effects of the present invention are: DC suppling equipment (supply voltage 60V or less) increases this circuit at power supply,
In the case that electric power polarity is reversed, which will not be added in equipment, avoid burning apparatus.In the correct situation of electric power polarity
Under, which is added in equipment, this circuit bring pressure drop in the case where load current 5A be lower than 0.1V, power consumption only less than
0.5W does not have to add radiator.The pressure drop 1.4V of general anti-reverse rectifier bridge, power consumption reach 7W, it is necessary to add radiator, even if using
The Schottky diode of low pressure drop is next anti-reverse, and pressure drop will also reach 0.4V, and power consumption 2W needs additional radiator.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention.
Specific embodiment
As shown in Figure 1, a kind of preventing reverse connection for DC power source soft-start circuit, including reverse-connection preventing circuit and soft-start circuit, prevent
Reversal connection circuit includes field-effect tube VT1, resistance R1, resistance R2, resistance R3, capacitor C1, zener diode VD1, specific connection are as follows:
The termination positive pole of resistance R1 mono-, another terminating resistor R2, one end of resistance R3 and capacitor C1 anode and zener diode VD1's
Cathode, the grid of another termination field-effect tube VT1 of resistance R2, the drain electrode of VT1 connect input power cathode, and the source electrode of VT1 connects capacitor
The other end of C1 cathode and resistance R3, zener diode VD1 anode.
Soft-start circuit includes effect pipe VT2 and resistance R4, resistance R5, resistance R6, capacitor C2, diode VD2, pressure stabilizing two
Pole pipe VD3, it is specific to connect are as follows: resistance R4 mono- terminates positive pole, one end and two of another terminating resistor R5 of resistance R4, resistance R6
The cathode of pole pipe VD2 anode and zener diode VD3, the grid of another termination field-effect tube VT2 of resistance R5, field-effect tube
The source electrode of VT2 connects the source electrode of zener diode VT1 and the anode of zener diode VD3, and it is defeated that the drain electrode of field-effect tube VT2 connects power supply
Cathode out, the cathode of diode VD2 connect the cathode of zener diode VD1, one end another termination capacitor C2 of resistance R6, capacitor
The cathode of another termination power output of C2, the indirect capacitor C3 of the positive and negative anodes of power supply output.
A kind of implementation method of preventing reverse connection for DC power source soft-start circuit, steps are as follows:
Entire circuit is divided into 2 parts, i.e. reverse-connection preventing circuit and soft-start circuit.
The course of work of reverse-connection preventing circuit are as follows: when input power polarity is correct, the partial pressure of resistance R1 and resistance R3 are to field
Effect pipe VT1 provides positive bias, field-effect tube VT1 conducting, and power supply is the load supplying of back, and zener diode VD1 is to prevent
When input voltage is excessively high resistance R1 and resistance R3 partial pressure breakdown VT1 grid, the effect of capacitor C1 be filter out spike and
Interference, the effect of R2 are current limliting；When input power polarity connection inverse time, the partial pressure of resistance R1 and resistance R3 is mentioned to field-effect tube VT1
For back bias voltage, field-effect tube VT1 cut-off, power supply is not the load supplying of back, prevents subsequent load because polarity of voltage connects
It burns instead.
The course of work of soft-start circuit are as follows: the series circuit of resistance R4 and resistance R5 and resistance R6 and capacitor C2 is field
Effect pipe VT2 provides bias voltage, and due to the charge effects of capacitor C2, the voltage on field-effect tube VT2 grid slowly rises, and makes
The conducting resistance obtained between field-effect tube VT2 source drain is gradually reduced, to inhibit power supply to the electricity at load power-up initial stage
Stream impact, realizes soft start function.
The Primary Component that circuit of the present invention uses is field-effect tube FDMC86520L, basic electric property energy parameter are as follows: N-channel
Power field effect pipe, pressure-resistant 60V, maximum is by electric current 22A, 7.9 m Ω of conducting resistance, when electronic equipment works normally, this
Pressure drop very little caused by a protection circuit.
Embodiment 1 is anti-reverse there was only 0.079V, every field-effect with slow-start circuit pressure drop with load current 5A calculating
Power consumption on pipe only has 0.1975W, can be radiated by pad without separately adding radiator, and makees anti-reverse device using diode
When part, in the case where loading same 5A, pressure drop minimum also wants 0.4V, and power consumption reaches 2W, it is necessary to add radiator, while also reduce
The efficiency of complete machine.
Claims (2)
1. a kind of preventing reverse connection for DC power source soft-start circuit, it is characterised in that: described including reverse-connection preventing circuit and soft-start circuit
Reverse-connection preventing circuit includes field-effect tube VT1, resistance R1, resistance R2, resistance R3, capacitor C1, zener diode VD1, specific connection
Are as follows: resistance R1 mono- terminates positive pole, another terminating resistor R2, one end of resistance R3 and capacitor C1 anode and zener diode
The cathode of VD1, the grid of another termination field-effect tube VT1 of resistance R2, the drain electrode of VT1 connect input power cathode, and the source electrode of VT1 connects
The other end of capacitor C1 cathode and resistance R3, zener diode VD1 anode；
The soft-start circuit includes effect pipe VT2 and resistance R4, resistance R5, resistance R6, capacitor C2, diode VD2, pressure stabilizing two
Pole pipe VD3, it is specific to connect are as follows: resistance R4 mono- terminates positive pole, one end and two of another terminating resistor R5 of resistance R4, resistance R6
The cathode of pole pipe VD2 anode and zener diode VD3, the grid of another termination field-effect tube VT2 of resistance R5, field-effect tube
The source electrode of VT2 connects the source electrode of zener diode VT1 and the anode of zener diode VD3, and it is defeated that the drain electrode of field-effect tube VT2 connects power supply
Cathode out, the cathode of diode VD2 connect the cathode of zener diode VD1, one end another termination capacitor C2 of resistance R6, capacitor
The cathode of another termination power output of C2, the indirect capacitor C3 of the positive and negative anodes of power supply output.
2. a kind of implementation method using preventing reverse connection for DC power source soft-start circuit described in claim 1, which is characterized in that step
It is rapid as follows,
Entire circuit is divided into 2 parts: reverse-connection preventing circuit and soft-start circuit；
The course of work of reverse-connection preventing circuit are as follows: when input power polarity is correct, the partial pressure of resistance R1 and resistance R3 are to field-effect
Pipe VT1 provides positive bias, field-effect tube VT1 conducting, and power supply is the load supplying of back, and zener diode VD1 is to prevent from inputting
The grid of the partial pressure breakdown VT1 of resistance R1 and resistance R3 when overtension, the effect of capacitor C1 is to filter out spike and interference,
The effect of R2 is current limliting；When input power polarity connection inverse time, the partial pressure of resistance R1 and resistance R3 provide negative to field-effect tube VT1
Bias, field-effect tube VT1 cut-off, power supply is not the load supplying of back, prevent subsequent load because polarity of voltage is reversed and
It burns；
The course of work of soft-start circuit are as follows: the series circuit of resistance R4 and resistance R5 and resistance R6 and capacitor C2 is field-effect
Pipe VT2 provides bias voltage, and due to the charge effects of capacitor C2, the voltage on field-effect tube VT2 grid slowly rises, so that field
Conducting resistance between effect pipe VT2 source drain is gradually reduced, to inhibit power supply to the electric current punching at load power-up initial stage
It hits, realizes soft start function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811209419.2A CN109104079A (en) | 2018-10-17 | 2018-10-17 | A kind of preventing reverse connection for DC power source soft-start circuit and implementation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811209419.2A CN109104079A (en) | 2018-10-17 | 2018-10-17 | A kind of preventing reverse connection for DC power source soft-start circuit and implementation method |
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| CN109104079A true CN109104079A (en) | 2018-12-28 |
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| CN201811209419.2A Pending CN109104079A (en) | 2018-10-17 | 2018-10-17 | A kind of preventing reverse connection for DC power source soft-start circuit and implementation method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110635676A (en) * | 2019-11-05 | 2019-12-31 | 中国船舶重工集团公司第七0五研究所 | Bootstrap type pre-charging slow-starting charging circuit |
| CN111799874A (en) * | 2020-08-10 | 2020-10-20 | 天津七一二通信广播股份有限公司 | Power management circuit of super capacitor and implementation method thereof |
| CN113612387A (en) * | 2021-08-05 | 2021-11-05 | 浙江鲲悟科技有限公司 | Vehicle-mounted power supply circuit |
| CN114848929A (en) * | 2022-04-25 | 2022-08-05 | 广州华一生物科技有限公司 | Novel negative pressure wound therapeutic instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110635676A (en) * | 2019-11-05 | 2019-12-31 | 中国船舶重工集团公司第七0五研究所 | Bootstrap type pre-charging slow-starting charging circuit |
| CN111799874A (en) * | 2020-08-10 | 2020-10-20 | 天津七一二通信广播股份有限公司 | Power management circuit of super capacitor and implementation method thereof |
| CN113612387A (en) * | 2021-08-05 | 2021-11-05 | 浙江鲲悟科技有限公司 | Vehicle-mounted power supply circuit |
| CN114848929A (en) * | 2022-04-25 | 2022-08-05 | 广州华一生物科技有限公司 | Novel negative pressure wound therapeutic instrument |
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Application publication date: 20181228 |