CN108599285B - Direct current output prevents flowing backward protection circuit - Google Patents
Direct current output prevents flowing backward protection circuit Download PDFInfo
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- CN108599285B CN108599285B CN201810011983.7A CN201810011983A CN108599285B CN 108599285 B CN108599285 B CN 108599285B CN 201810011983 A CN201810011983 A CN 201810011983A CN 108599285 B CN108599285 B CN 108599285B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a direct current output reverse filling prevention protection circuit which comprises a driving IC module, a circuit input port and a circuit output port, wherein the circuit input port is used for being connected with a direct current charging module, the circuit output port is used for being connected with a battery, a power switch module is arranged between the circuit input port and the circuit output port in series, and the driving IC module is connected with the circuit input port and the circuit output port in a sampling mode and is controlled to be connected with the power switch module. According to the invention, the power switch module is serially arranged between the direct current charging module and the battery, the driving IC module collects the output voltage of the direct current charging module and the voltage of the battery, and the on-off condition of the power switch module is controlled by comparing the two voltages, so that each device has high reaction speed and high control reliability, the reverse flow phenomenon of the voltage of the battery is avoided, and the charging module is effectively protected.
Description
Technical Field
The invention relates to a direct current output reverse-filling prevention protection circuit, and belongs to the technical field of power electronics.
Background
When the charger module charges the battery, the battery is used as a charging object and is also a load of the power supply. When the charging power supply stops outputting, the battery can supply power to the output side of the charger module, namely, the battery can flow backwards. If the charger module does not have the reverse-charging prevention protection circuit, the electric quantity of the battery is wasted, and the charger module can be damaged by overhigh reverse-charging voltage. Therefore, it is necessary to provide an anti-reverse-flow protection circuit on the dc output side of the charger module.
Chinese patent document CN203278367U discloses a high-power battery charging device for preventing reverse connection of battery, which prevents reverse-flow of battery charging current by using a relay switch and a voltage acquisition circuit to cooperate with each other. However, the relay switch has slow response, adhesion phenomenon is easy to occur, and the control reliability is poor.
Disclosure of Invention
The invention aims to provide a direct current output reverse-filling prevention protection circuit which is used for solving the problem that the reliability of battery charging current reverse-filling prevention control is poor by adopting a relay switch.
In order to solve the technical problem, the invention provides a direct current output reverse-irrigation prevention protection circuit, which comprises the following schemes:
the first scheme is as follows: the power switch module is connected between the circuit input port and the circuit output port in series, and the driving IC module is connected with the circuit input port and the circuit output port in a sampling mode and is connected with the power switch module in a control mode.
Scheme II: on the basis of the first scheme, the power switch module comprises a first power switch, and the driving IC module is connected to a control end of the first power switch in a control manner.
The third scheme is as follows: on the basis of the second scheme, the first power switch is provided with a second power switch in parallel, and the driving IC module is connected with a control end of the second power switch in a control mode.
And the scheme is as follows: on the basis of the third scheme, an anti-reverse diode branch and a resistance branch are respectively connected between the control end of each power switch and the drive IC module and between the control end of each power switch and the input port of the circuit.
And a fifth scheme: on the basis of the fourth scheme, the first power switch and the second power switch are both PMOS tubes, and the drain electrode and the source electrode of each PMOS tube are respectively connected with the circuit input port and the circuit output port; and a diode is serially arranged in the anti-reverse diode branch, and the conduction direction of the diode is from the circuit input port to the drive IC module.
Scheme six: on the basis of the scheme I, II, III, IV or V, the drive IC module comprises an integrated circuit chip with the model number of ISL6144 IVZ.
The invention has the beneficial effects that:
a power switch module is serially arranged between the direct current charging module and the battery, the driving IC module collects and compares the output voltage of the direct current charging module and the voltage of the battery, when the output voltage of the direct current charging module is higher than the voltage of the battery, the power switch module is conducted, and the direct current charging module carries out normal charging on the battery; when the direct current charging module suddenly stops outputting and the like, the output voltage of the direct current charging module is detected to be lower than the voltage of the battery, the power switch module is disconnected, a closed loop is not formed between the direct current charging module and the battery any more, therefore, the voltage of the battery is prevented from flowing backwards, each device is high in reaction speed and control reliability, and the charging module is effectively protected.
Furthermore, the drain electrode and the source electrode of the PMOS tube are respectively connected with the direct current charging module and the battery, when the PMOS tube is cut off, the voltage from the battery reversely biases a parasitic diode in the PMOS tube, and the parasitic diode cannot reversely flow into the direct current charging module.
Drawings
Fig. 1 is a schematic structural diagram of a direct current output reverse-flow prevention protection circuit of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The structure schematic diagram of the direct current output reverse-filling prevention protection circuit is shown in fig. 1, and comprises a power switch module, a drive IC module, a peripheral voltage division circuit, a circuit input port VO1 for connecting a direct current charging module, and a circuit output port VO for connecting a battery, wherein the circuit input port VO1 is used for connecting the direct current charging module, and the circuit output port VO is used for connecting the battery to be charged. The power switch module is serially arranged between the circuit input port VO1 and the circuit output port VO, and the drive IC module is connected with the circuit input port VO1 and the circuit output port VO in a sampling mode and is connected with the power switch module in a control mode.
Specifically, the power switch module comprises a first power switch Q1 and a second power switch Q2 which are connected in parallel, wherein the two power switches are PMOS transistors and are in the model number of FDH055N 15A. The drain and the source of each PMOS tube are respectively connected with the circuit input port VO1 and the circuit output port VO, and the driving IC module is respectively connected with the grid control ends of the two PMOS tubes through resistors R3 and R5 in a control mode.
A first resistance branch is connected between the control end of the first power switch PMOS transistor Q1 and the circuit input port VO1, a resistor R1 is connected in series in the first resistance branch, a first anti-reverse diode branch is connected between the control end of the first power switch PMOS transistor Q1 and the drive IC module, and a diode D1 and a resistor R4 are connected in series in the first anti-reverse diode branch. A second resistance branch is connected between the control end of the second power switch PMOS transistor Q2 and the circuit input port VO1, a resistor R2 is connected in series in the second resistance branch, a second anti-reverse diode branch is connected between the control end of the second power switch PMOS transistor and the drive IC module, and a diode D2 and a resistor R6 are connected in series in the second anti-reverse diode branch. The type of the diodes D1 and D2 is 1N5819, and the direction of the diodes is from the circuit input port VO1 to the driver IC module, that is, when the diodes D1 and D2 are turned on, the current direction of the diodes is from the circuit input port VO1 to the driver IC module.
As another embodiment, the power switch module may be composed of only one power switch PMOS transistor and its corresponding electrical device, or may be composed of two or more power switch PMOS transistors connected in parallel and their corresponding electrical devices. When a plurality of power switch PMOS tubes are connected in parallel, the current carrying capacity of the circuit can be increased, and the charging current is improved.
The driving IC module comprises an integrated circuit chip U1 with the model number of ISL6144IVZ, wherein a pin GATE of the U1 is used as a control signal output end and is respectively connected with the grid control ends of the first power switch PMOS tube and the second power switch PMOS tube through resistors R3 and R5 in a control mode. The pin VIN of the U1 is connected to the input port VO1 of the sampling circuit, a capacitor C1 is connected between the pin HVREF and VIN of the U1, and a capacitor C2 is connected between the pin VIN of the U1 and ground. The pin COMP of U1 detects the battery voltage through the voltage dividing network of resistors R7 and R8, the two ends of the resistor R7 are connected with a capacitor C3 and the pin of U1
The +12V supply is connected through resistor R9 and diode D3. A capacitor C4 is also connected between the circuit output port VO and GND.
In the embodiment, the voltage of the VO1/VO terminal is 40V-60V, the resistances of the resistors R1 and R2 are both 10K Ω, the resistances of the resistors R3, R4, R5 and R6 are all 5.1 Ω, the resistance of the resistor R7 is 499 Ω, the resistance of the resistor R8 is 47.5K Ω, the resistance of the resistor R9 is 3K Ω, the capacitance of the capacitor C1 is 150nF, the capacitance of the capacitor C2 is 100nF/100V, the capacitance of the capacitor C3 is 10nF, and the capacitance of the capacitor C4 is 100 nF/100V. Of course, the specific parameters of the above devices are not limited, and may be adaptively adjusted according to the application requirements.
The working principle of the direct current output reverse-filling prevention protection circuit is as follows:
a pin VIN of a driving IC module U1 acquires a circuit input port VO1, namely the voltage of a direct current charging module, a pin COMP of U1 detects a circuit output port VO, namely the voltage of a battery through a voltage division network of R7 and R8, by comparing two sampling voltages, when the voltage of the charging module is higher than the voltage of the battery, the pin COMP and GATE of U1 output high level, two PMOS tubes Q1 and Q2 are controlled by the same signal of a GATE pin of U1, the grid driving voltage exists, Q1 and Q2 are conducted, and the direct current charging module normally charges the battery. When the PMOS tube is conducted, the voltage drop between the two ends of the drain electrode and the source electrode is low, the loss of output voltage can be effectively reduced, and the power consumption of the part is reduced. In addition, because the voltage drop of the PMOS transistor is less than the transistor voltage of its parasitic diode, the parasitic diode is bypassed.
When the driver IC module U1 detects that the voltage of the charging module is lower than the battery voltage, the pins COMP and GATE of the U1 output a low level, the two PMOS transistors Q1 and Q2 are turned on and off, and the dc charging module no longer charges the battery. At the moment, the PMOS tube is cut off, and a loop is not formed between the charging module and the battery any more, so that the voltage of the battery is prevented from flowing backwards, and the protection effect on the charging module is achieved.
In the invention, the PMOS transistor is not connected into the circuit according to the common standard connection method, because if the PMOS transistor is connected according to the standard connection method, the circuit input port VO1 is connected with the source electrode of the PMOS transistor, and the circuit output port VO is connected with the drain electrode of the PMOS transistor, so that the direction of the parasitic diode of the PMOS transistor is from the circuit output port VO to the circuit input port VO 1. So that the voltage from the battery at the VO terminal will flow back to VO1 through the parasitic diode. By adopting the scheme of the invention, the direction of the parasitic diode is from the circuit input port VO1 to the circuit output port VO, when the PMOS tube is cut off, the voltage of the battery at the VO end reversely biases the parasitic diode, and the parasitic diode cannot reversely flow to the VO 1.
Claims (3)
1. A direct current output anti-reverse-filling protection circuit is characterized by comprising a driving IC module, a circuit input port and a circuit output port, wherein the circuit input port is used for being connected with a direct current charging module, the circuit output port is used for being connected with a battery, a power switch module is serially arranged between the circuit input port and the circuit output port, the driving IC module is connected with the circuit input port and the circuit output port in a sampling mode and is in control connection with the power switch module, the power switch module comprises a first power switch, the driving IC module is in control connection with a control end of the first power switch, the first power switch is in parallel connection with a second power switch, the driving IC module is in control connection with a control end of the second power switch, a first anti-reverse diode branch and a first resistance branch are respectively connected between the control end of the first power switch and the driving IC module and the circuit input port, a diode D1 and a resistor R4 are arranged in the first anti-reverse diode branch in series, and the conduction direction of the diode D1 is from the circuit input port to the drive IC module; a resistor R1 is connected in series in the first resistor branch; one end of the first resistance branch is connected with the input port of the circuit, the other end of the first resistance branch is connected with the control end of the first power switch and one end of the first anti-reverse diode branch, one end of the first anti-reverse diode branch is connected with the control end of the first power switch and the other end of the first resistance branch, the other end of the first anti-reverse diode branch is connected with the driving IC module, a resistor R3 is further connected between the control end of the first power switch and the driving IC module, and two ends of a resistor R3 are respectively connected with two ends of the first anti-reverse diode branch, so that a diode D1 and a resistor R4 are connected in series and then connected with a resistor R3 in parallel;
a second anti-reverse diode branch and a second resistance branch are respectively connected between the control end of the second power switch and the drive IC module and the circuit input port, a diode D2 and a resistor R6 are serially arranged in the second anti-reverse diode branch, and the conduction direction of the diode D2 is from the circuit input port to the drive IC module; a resistor R2 is connected in series in the second resistor branch; one end of the second resistance branch is connected with the input port of the circuit, the other end of the second resistance branch is connected with the control end of the second power switch and one end of the second anti-reverse diode branch, one end of the second anti-reverse diode branch is connected with the control end of the second power switch and the other end of the second resistance branch, the other end of the second anti-reverse diode branch is connected with the driving IC module, a resistor R5 is further connected between the control end of the second power switch and the driving IC module, two ends of the resistor R5 are respectively connected with two ends of the second anti-reverse diode branch, and the diode D2 and the resistor R6 are connected in parallel with the resistor R5 after being connected in series.
2. The direct current output reverse flow prevention protection circuit according to claim 1, wherein the first power switch and the second power switch are both PMOS transistors, and a drain and a source of each PMOS transistor are respectively connected to the circuit input port and the circuit output port.
3. The direct current output reverse flow prevention protection circuit according to claim 1 or 2, wherein the drive IC module comprises an integrated circuit chip with model number ISL6144 IVZ.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810011983.7A CN108599285B (en) | 2018-01-05 | 2018-01-05 | Direct current output prevents flowing backward protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810011983.7A CN108599285B (en) | 2018-01-05 | 2018-01-05 | Direct current output prevents flowing backward protection circuit |
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| CN108599285A CN108599285A (en) | 2018-09-28 |
| CN108599285B true CN108599285B (en) | 2020-12-04 |
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| CN201810011983.7A Active CN108599285B (en) | 2018-01-05 | 2018-01-05 | Direct current output prevents flowing backward protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109995235B (en) * | 2019-04-30 | 2024-03-08 | 广东美的制冷设备有限公司 | Intelligent power module and electrical equipment |
| CN111864718A (en) * | 2020-08-14 | 2020-10-30 | 精进电动科技股份有限公司 | Anti-reverse connection circuit, electronic parking circuit and control method |
| CN112843491B (en) * | 2021-02-08 | 2021-10-08 | 深圳天基权健康科技集团股份有限公司 | Switching circuit, semiconductor laser treatment equipment and power supply switching control method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2573893A2 (en) * | 2011-09-20 | 2013-03-27 | Hitachi Automotive Systems, Ltd. | Electronic control unit for automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5139022B2 (en) * | 2007-10-15 | 2013-02-06 | ローム株式会社 | Overvoltage protection circuit and power management circuit and electronic equipment using the same |
| CN103904620B (en) * | 2012-12-28 | 2018-09-14 | 南京中兴软件有限责任公司 | A kind of DC supply input counnter attack fills circuit and method |
| CN104218531A (en) * | 2014-09-04 | 2014-12-17 | 国家电网公司 | Short circuit protecting circuit and method |
| CN204156568U (en) * | 2014-10-28 | 2015-02-11 | 重庆永翕光电科技有限公司 | A kind of solar recharging reverse-filling controller |
| CN106532677A (en) * | 2017-01-05 | 2017-03-22 | 科蒂斯技术（苏州）有限公司 | DC input reverse connection preventing circuit based on N-MOSFET |
| CN106712226A (en) * | 2017-03-31 | 2017-05-24 | 许继电源有限公司 | Battery charger, direct current charging anti-backflow device and control method |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2573893A2 (en) * | 2011-09-20 | 2013-03-27 | Hitachi Automotive Systems, Ltd. | Electronic control unit for automobile |
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