CN111327038A - Anti-backflow circuit and electrical equipment - Google Patents
Anti-backflow circuit and electrical equipment Download PDFInfo
- Publication number
- CN111327038A CN111327038A CN202010171534.6A CN202010171534A CN111327038A CN 111327038 A CN111327038 A CN 111327038A CN 202010171534 A CN202010171534 A CN 202010171534A CN 111327038 A CN111327038 A CN 111327038A
- Authority
- CN
- China
- Prior art keywords
- resistor
- circuit
- optocoupler
- backflow
- pmos transistor
- 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.)
- Pending
Links
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 230000002265 prevention Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/006—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of too high or too low voltage
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
Description
技术领域technical field
本发明涉及电子电路领域，具体地，涉及一种防倒灌电路和用电设备。The invention relates to the field of electronic circuits, in particular to an anti-backflow circuit and electrical equipment.
背景技术Background technique
防倒灌电路应用于很多场合，他的作用就是保证各个单体电源互相独立、不出现反灌现象。二极管由于本身具有单向导电性，所以就是天然的防倒灌电路。然而，由于二极管的正向压降比较大，当输出电流很大时，电路的损耗就非常大。在一些充电电路中，当输入电压低于被充电电池电压时。电池会通过功率电感，功率MOS的内部二极管向输入电路放电。The anti-backflow circuit is used in many occasions, and its function is to ensure that each single power supply is independent of each other, and there is no backflow phenomenon. Since the diode itself has unidirectional conductivity, it is a natural anti-backflow circuit. However, due to the large forward voltage drop of the diode, when the output current is large, the loss of the circuit is very large. In some charging circuits, when the input voltage is lower than the voltage of the battery being charged. The battery will discharge to the input circuit through the power inductor, the internal diode of the power MOS.
如专利文献CN110676830A公开了一种电流防倒灌电路以及智能门锁系统，该电流防倒灌电路包括：第一电流防倒灌模块、升压电路以及第二电流防倒灌模块。现有的防倒灌电路结构较为复杂，在一些低成本的设备中引用会显著增加生产成本，因而难以应用。For example, the patent document CN110676830A discloses a current anti-backflow circuit and an intelligent door lock system. The current anti-backflow circuit includes: a first current backflow prevention module, a booster circuit and a second current backflow prevention module. The structure of the existing anti-backflow circuit is relatively complex, and its introduction in some low-cost equipment will significantly increase the production cost, so it is difficult to apply.
发明内容SUMMARY OF THE INVENTION
针对现有技术中的缺陷，本发明的目的是提供一种防倒灌电路和用电设备。In view of the defects in the prior art, the purpose of the present invention is to provide an anti-backflow circuit and electrical equipment.
根据本发明提供的一种防倒灌电路，包括：功率电路、采样电路和控制电路；An anti-backflow circuit provided according to the present invention includes: a power circuit, a sampling circuit and a control circuit;
所述采样电路的连接输入电压Vin，并通过所述功率电路连接所述控制电路，从而控制所述控制电路中的PMOS管Q1。The sampling circuit is connected to the input voltage Vin, and is connected to the control circuit through the power circuit, so as to control the PMOS transistor Q1 in the control circuit.
优选地，所述采样电路包括串联的电阻R10和电阻R13，所述电阻R10的一端连接输入电压Vin，另一端通过所述电阻R13接地。Preferably, the sampling circuit includes a resistor R10 and a resistor R13 connected in series, one end of the resistor R10 is connected to the input voltage Vin, and the other end is grounded through the resistor R13.
优选地，所述功率电路包括：电阻R3、比较器U2和光耦U10；Preferably, the power circuit includes: a resistor R3, a comparator U2 and an optocoupler U10;
所述电阻R3的一端连接输入电压Vin，另一端连接所述光耦U10中发光二极管的阳极，所述比较器U2的阳极连接在所述电阻R13与地之间，所述比较器U2的阴极连接所述光耦U10中发光二极管的阴极，所述比较器U2的参考极连接在所述电阻R10和所述电阻R13之间；One end of the resistor R3 is connected to the input voltage Vin, the other end is connected to the anode of the light-emitting diode in the optocoupler U10, the anode of the comparator U2 is connected between the resistor R13 and the ground, and the cathode of the comparator U2 Connect the cathode of the light-emitting diode in the optocoupler U10, and the reference pole of the comparator U2 is connected between the resistor R10 and the resistor R13;
所述光耦U10中光敏三极管的发射极接地，所述光耦U10中光敏三极管的集电极连接所述控制电路。The emitter of the phototransistor in the optocoupler U10 is grounded, and the collector of the phototransistor in the optocoupler U10 is connected to the control circuit.
优选地，所述控制电路包括：电阻R1、电阻R2、电阻R6和所述PMOS管Q1；Preferably, the control circuit includes: a resistor R1, a resistor R2, a resistor R6 and the PMOS transistor Q1;
所述电阻R6的一端连接所述光耦U10，所述电阻R1和所述电阻R2的一端并联在所述电阻R6的另一端；One end of the resistor R6 is connected to the optocoupler U10, and one end of the resistor R1 and the resistor R2 are connected in parallel with the other end of the resistor R6;
所述电阻R2的另一端连接电池电压Vcharge；The other end of the resistor R2 is connected to the battery voltage Vcharge;
所述电阻R1的另一端连接所述PMOS管Q1的栅极，所述PMOS管Q1的源极连接电池电压Vcharge，所述PMOS管Q1的漏极连接输入电压Vin。The other end of the resistor R1 is connected to the gate of the PMOS transistor Q1, the source of the PMOS transistor Q1 is connected to the battery voltage Vcharge, and the drain of the PMOS transistor Q1 is connected to the input voltage Vin.
根据本发明提供的用电设备，包括上述的任一项防倒灌电路。The electrical equipment provided according to the present invention includes any one of the above-mentioned anti-backflow circuits.
与现有技术相比，本发明具有如下的有益效果：Compared with the prior art, the present invention has the following beneficial effects:
本发明的防倒灌电路结构简单，防倒灌效果可靠，便于推广应用。The anti-backflow circuit of the invention has a simple structure, reliable anti-backflow effect, and is convenient for popularization and application.
VIN的输入电压>开通电压点时MOS打开输入电流经过MOS的沟道给后级电路。When the input voltage of VIN > the turn-on voltage point, the MOS turns on and the input current passes through the channel of the MOS to the subsequent circuit.
当输入电压低于开通电压点时，MOS关闭防止电池倒灌到VIN端。When the input voltage is lower than the turn-on voltage point, the MOS is turned off to prevent the battery from flowing back to the VIN terminal.
调整采样电路的参数可改变mos的开通电压点。可根据电池电压与输入电压的情况去设置。Adjusting the parameters of the sampling circuit can change the turn-on voltage point of the mos. It can be set according to the battery voltage and input voltage.
附图说明Description of drawings
通过阅读参照以下附图对非限制性实施例所作的详细描述，本发明的其它特征、目的和优点将会变得更明显：Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:
图1为本发明防倒灌电路的电路结构图。FIG. 1 is a circuit structure diagram of an anti-backflow circuit of the present invention.
具体实施方式Detailed ways
下面结合具体实施例对本发明进行详细说明。以下实施例将有助于本领域的技术人员进一步理解本发明，但不以任何形式限制本发明。应当指出的是，对本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变化和改进。这些都属于本发明的保护范围。The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the inventive concept. These all belong to the protection scope of the present invention.
如图1所示，本发明提供的一种防倒灌电路，包括：功率电路、采样电路和控制电路。采样电路的连接输入电压Vin，并通过功率电路连接控制电路，从而控制控制电路中的PMOS管Q1。As shown in FIG. 1 , an anti-backflow circuit provided by the present invention includes a power circuit, a sampling circuit and a control circuit. The connection input voltage Vin of the sampling circuit is connected to the control circuit through the power circuit, so as to control the PMOS transistor Q1 in the control circuit.
采样电路包括串联的电阻R10和电阻R13，电阻R10的一端连接输入电压Vin，另一端通过电阻R13接地。The sampling circuit includes a resistor R10 and a resistor R13 connected in series. One end of the resistor R10 is connected to the input voltage Vin, and the other end is grounded through the resistor R13.
功率电路包括：电阻R3、比较器U2和光耦U10。电阻R3的一端连接输入电压Vin，另一端连接光耦U10中发光二极管的阳极，比较器U2的阳极连接在电阻R13与地之间，比较器U2的阴极连接光耦U10中发光二极管的阴极，比较器U2的参考极连接在电阻R10和电阻R13之间。光耦U10中光敏三极管的发射极接地，光耦U10中光敏三极管的集电极连接控制电路。The power circuit includes: resistor R3, comparator U2 and optocoupler U10. One end of the resistor R3 is connected to the input voltage Vin, the other end is connected to the anode of the light-emitting diode in the optocoupler U10, the anode of the comparator U2 is connected between the resistor R13 and the ground, the cathode of the comparator U2 is connected to the cathode of the light-emitting diode in the optocoupler U10, The reference electrode of comparator U2 is connected between resistor R10 and resistor R13. The emitter of the phototransistor in the optocoupler U10 is grounded, and the collector of the phototransistor in the optocoupler U10 is connected to the control circuit.
控制电路包括：电阻R1、电阻R2、电阻R6和PMOS管Q1。电阻R6的一端连接光耦U10，电阻R1和电阻R2的一端并联在电阻R6的另一端。电阻R2的另一端连接电池电压Vcharge。电阻R1的另一端连接PMOS管Q1的栅极，PMOS管Q1的源极连接电池电压Vcharge，PMOS管Q1的漏极连接输入电压Vin。The control circuit includes: resistor R1, resistor R2, resistor R6 and PMOS transistor Q1. One end of the resistor R6 is connected to the optocoupler U10, and one end of the resistor R1 and the resistor R2 is connected in parallel with the other end of the resistor R6. The other end of the resistor R2 is connected to the battery voltage Vcharge. The other end of the resistor R1 is connected to the gate of the PMOS transistor Q1, the source of the PMOS transistor Q1 is connected to the battery voltage Vcharge, and the drain of the PMOS transistor Q1 is connected to the input voltage Vin.
本发明的工作原理如下：The working principle of the present invention is as follows:
由电阻R10,R13组成的电压采样电路采集输入电压Vin。The voltage sampling circuit composed of resistors R10 and R13 collects the input voltage Vin.
当Vin端电压>15V时，比较器U2(TL431)的阴极为低电平，光耦U10通过电阻R3提供电流，光耦的光敏三极管导通，拉低PMOS管Q1的G极为低电平，PMOS管开通，充电电流从PMOS管流过。When the Vin terminal voltage is >15V, the cathode of the comparator U2 (TL431) is at a low level, the optocoupler U10 provides current through the resistor R3, the phototransistor of the optocoupler is turned on, and the G of the PMOS transistor Q1 is pulled down to a very low level, The PMOS tube is turned on, and the charging current flows through the PMOS tube.
当Vin电压<15V时U2(TL431)的阴极为高电平，逼使光耦截止，PMOS管Q1的G极通过体内二极管-R2-R1电阻提高偏压，逼使PMOS管Q1关断，从而实现在特定的范围内电流的单向性。When the Vin voltage is less than 15V, the cathode of U2 (TL431) is at a high level, forcing the optocoupler to turn off, and the G pole of the PMOS transistor Q1 increases the bias voltage through the resistance of the diode-R2-R1 in the body, forcing the PMOS transistor Q1 to turn off, thus Achieving unidirectional current flow within a specific range.
本发明可适用于各类用电设备中，防止电池电压倒流到输入端。The invention can be applied to all kinds of electrical equipment, and can prevent the battery voltage from flowing back to the input end.
以上对本发明的具体实施例进行了描述。需要理解的是，本发明并不局限于上述特定实施方式，本领域技术人员可以在权利要求的范围内做出各种变化或修改，这并不影响本发明的实质内容。在不冲突的情况下，本申请的实施例和实施例中的特征可以任意相互组合。Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essential content of the present invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily, provided that there is no conflict.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010171534.6A CN111327038A (en) | 2020-03-12 | 2020-03-12 | Anti-backflow circuit and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010171534.6A CN111327038A (en) | 2020-03-12 | 2020-03-12 | Anti-backflow circuit and electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111327038A true CN111327038A (en) | 2020-06-23 |
Family
ID=71171604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010171534.6A Pending CN111327038A (en) | 2020-03-12 | 2020-03-12 | Anti-backflow circuit and electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111327038A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203933064U (en) * | 2014-03-13 | 2014-11-05 | 广东瑞德智能科技股份有限公司 | The rechargeable solar charging electric control circuit of a kind of counnter attack |
| CN105337483A (en) * | 2014-08-07 | 2016-02-17 | 中兴通讯股份有限公司 | Device for preventing current from flowing backwards |
| CN107370384A (en) * | 2017-07-26 | 2017-11-21 | 广州金升阳科技有限公司 | The Switching Power Supply of secondary side feedback control circuit and the application circuit |
| WO2018076294A1 (en) * | 2016-10-28 | 2018-05-03 | 海能达通信股份有限公司 | Reverse connection and current backflow prevention circuit |
| CN110739736A (en) * | 2019-09-10 | 2020-01-31 | 宁波中车新能源科技有限公司 | stand-by power supply circuit of super capacitor gate |
| CN211701483U (en) * | 2020-03-12 | 2020-10-16 | 北京绿能芯创电子科技有限公司 | Prevent flowing backward circuit and consumer |
-
2020
- 2020-03-12 CN CN202010171534.6A patent/CN111327038A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203933064U (en) * | 2014-03-13 | 2014-11-05 | 广东瑞德智能科技股份有限公司 | The rechargeable solar charging electric control circuit of a kind of counnter attack |
| CN105337483A (en) * | 2014-08-07 | 2016-02-17 | 中兴通讯股份有限公司 | Device for preventing current from flowing backwards |
| WO2018076294A1 (en) * | 2016-10-28 | 2018-05-03 | 海能达通信股份有限公司 | Reverse connection and current backflow prevention circuit |
| CN107370384A (en) * | 2017-07-26 | 2017-11-21 | 广州金升阳科技有限公司 | The Switching Power Supply of secondary side feedback control circuit and the application circuit |
| CN110739736A (en) * | 2019-09-10 | 2020-01-31 | 宁波中车新能源科技有限公司 | stand-by power supply circuit of super capacitor gate |
| CN211701483U (en) * | 2020-03-12 | 2020-10-16 | 北京绿能芯创电子科技有限公司 | Prevent flowing backward circuit and consumer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101252309A (en) | Direct-current power supply slow startup control circuit | |
| CN104486891A (en) | Led drive circuit and constant current driver | |
| CN204349778U (en) | LED drive circuit and switch power controller thereof | |
| CN106814841A (en) | A kind of power control circuit for saving electric energy | |
| CN110461064A (en) | A kind of LED driving circuit, LED driving method and LED lighting equipment | |
| CN106602532B (en) | Current limiting circuit and driving method thereof, PMIC protection system and display device protection system | |
| CN202587506U (en) | Adjustable constant current source | |
| CN106961768A (en) | A kind of LED linear constant-current drive circuit of active valley fill circuit pattern | |
| CN104410038A (en) | Overvoltage protection circuit for discharge regulating circuit | |
| CN104635836A (en) | Band-gap reference circuit | |
| CN105322948B (en) | Half-bridge drive circuit | |
| CN207265996U (en) | A kind of pulse high current ignition switch circuit | |
| CN205051676U (en) | Half -bridge drive circuit | |
| CN204291527U (en) | LED drive circuit and constant-current driver | |
| CN111327038A (en) | Anti-backflow circuit and electrical equipment | |
| CN211701483U (en) | Prevent flowing backward circuit and consumer | |
| TW201037943A (en) | Fuel cell system and power management method thereof | |
| CN217115613U (en) | Undervoltage protection circuit | |
| CN109274064A (en) | A kind of power protecting circuit | |
| CN2924914Y (en) | Soft start circuit for micro-power power module | |
| CN114448213A (en) | Power supply circuit suitable for narrow pulse | |
| CN209313807U (en) | Electric charge recycling circuit, power supply circuit and switching power circuit system | |
| CN210724282U (en) | A battery overcharge protection circuit | |
| CN202797902U (en) | Short circuit protection circuit used for booster circuit | |
| CN208337431U (en) | A kind of power protecting circuit for automatic transfer switch controller |
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 |