CN220342088U - Overcharging-preventing power supply protection circuit - Google Patents
Overcharging-preventing power supply protection circuit Download PDFInfo
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- CN220342088U CN220342088U CN202322045496.1U CN202322045496U CN220342088U CN 220342088 U CN220342088 U CN 220342088U CN 202322045496 U CN202322045496 U CN 202322045496U CN 220342088 U CN220342088 U CN 220342088U
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- relay
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- 238000001514 detection method Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses an overcharge-preventing power supply protection circuit, which comprises a charging interface module, a charging protection module, a battery charging module, a battery to be charged and a magnetic core on-off control module, wherein the charging interface module is connected with the charging protection module; the charging protection module comprises a relay and a magnetic core on-off switch circuit, wherein the relay comprises a magnetic core part and a switch part, and the magnetic core part comprises a magnetic core and a coil wound on the magnetic core; the charging interface module is connected with the battery charging module through a switch component of the relay, and the battery charging module is connected with a battery to be charged; the magnetic core on-off control module comprises a voltage detection unit and an on-off control unit. The utility model uses the switch component of the relay as the switch of the charging path, and controls the on-off of the switch component by controlling the electrifying of the magnetic core part of the relay, thereby being capable of adapting to the charging scenes of various batteries.
Description
Technical Field
The present utility model relates to power supply charging protection, and more particularly, to an overcharge-preventing power supply protection circuit.
Background
When the battery is used, the well site needs to charge the battery, the voltage of the battery gradually rises along with the increase of the stored electric quantity in the battery charging process, and when the stored electric quantity of the battery reaches saturation, if the battery is continuously charged, the internal structure of the battery is damaged, the phenomenon is called overcharge, so that the battery is often required to be overcharged for protection;
at present, the overcharge protection of the battery generally needs to set a switch on a charging path of the battery, and the corresponding switch is cut off according to the charging condition of the battery, so that the method is only suitable for the condition that the voltage of the charging path is low in the charging path, when the voltage is high, if the switch is a manual switch, the danger is easy to occur, if a switching circuit based on an MOS tube is collected and controlled by a signal of a control unit, and the device of the switching circuit can be damaged due to the high voltage.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide an overcharge-preventing power supply protection circuit, which uses a switch component of a relay as a switch of a charging path, controls the on-off of the switch component by controlling the electrifying of a magnetic core part of the relay, and can adapt to the charging scenes of various batteries.
The aim of the utility model is realized by the following technical scheme: an overcharge-preventing power supply protection circuit comprises a charging interface module, a charging protection module, a battery charging module, a battery to be charged and a magnetic core on-off control module;
the charging protection module comprises a relay and a magnetic core on-off switch circuit, wherein the relay comprises a magnetic core part and a switch part, and the magnetic core part comprises a magnetic core and a coil wound on the magnetic core;
the charging interface module is connected with the battery charging module through a switch component of the relay, and the battery charging module is connected with a battery to be charged;
one end of the magnetic core on-off switch circuit is connected with a VDD power supply, the other end of the magnetic core on-off switch circuit is connected with a first end of a coil of the magnetic core part, and a second end of the coil of the magnetic core part is grounded;
the magnetic core on-off control module comprises a voltage detection unit and an on-off control unit, wherein the voltage detection unit is used for detecting the voltage of the battery to be charged, the output end of the voltage detection unit is connected with the on-off control unit, and the output end of the on-off control unit is connected with the control input end of the magnetic core on-off switch circuit.
Further, the on-off control unit comprises a reference voltage source and a voltage comparator, wherein the non-inverting input end of the voltage comparator is connected with the output end of the voltage detection unit, the inverting input end of the voltage comparator is connected with the reference voltage source, and the output end of the voltage comparator is connected with the control input end of the magnetic core on-off switching circuit.
Further, the relay is a normally closed relay.
Further, the magnetic core on-off switch circuit comprises a MOS tube M1 and a triode Q1, and a source electrode of the MOS tube M1 is connected with a VDD power supply; the drain electrode of the MOS tube M1 is connected with the first end of the coil of the magnetic core part, a first resistor R1 is connected between the source electrode and the drain electrode of the MOS tube M1, the source electrode of the MOS tube M1 is also connected to the collector electrode of the transistor Q1 through a second resistor R2 and a third resistor R3 in sequence, and the grid electrode of the MOS tube M1 is connected between the second resistor R2 and the third resistor R3; the emitter of the transistor Q1 is grounded; the base electrode of the triode Q1 is used as a control input end of the magnetic core on-off switching circuit and is connected with the output end of the voltage comparator.
The MOS tube M1 is a PMOS tube, and the triode Q1 is an NPN triode; the VDD power supply provides any voltage with the voltage range of 5-12V, and the voltage range is specifically selected according to the types and withstand voltage parameters of the MOS tube and the triode;
the beneficial effects of the utility model are as follows: the relay is characterized in that a switch component of the relay is used as a switch of a charging path, and the on-off of the switch component is controlled by controlling the electrifying of a magnetic core part of the relay; the magnetic core on-off switch circuit based on the MOS tube is arranged on a link of the magnetic core part, and a VDD power supply with lower voltage is adopted, whether the magnetic core part of the relay is electrified or not is controlled according to a signal output by the magnetic core control module, so that the on-off of the switch component is controlled, the on-off section of the charging path is indirectly controlled, and the voltage in the charging path cannot directly influence devices in the magnetic core on-off switch circuit, so that the whole anti-overcharge protection circuit can adapt to charging scenes of various batteries.
Drawings
FIG. 1 is a schematic diagram of the present utility model;
fig. 2 is a schematic diagram of a magnetic core on-off switching circuit in the present utility model.
Detailed Description
The technical solution of the present utility model will be described in further detail with reference to the accompanying drawings, but the scope of the present utility model is not limited to the following description.
As shown in fig. 1, an overcharge-preventing power supply protection circuit includes a charging interface module, a charging protection module, a battery charging module, a battery to be charged and a magnetic core on-off control module;
the charging protection module comprises a relay and a magnetic core on-off switch circuit, wherein the relay comprises a magnetic core part and a switch part, and the magnetic core part comprises a magnetic core and a coil wound on the magnetic core;
the charging interface module is connected with the battery charging module through a switch component of the relay, and the battery charging module is connected with a battery to be charged;
one end of the magnetic core on-off switch circuit is connected with a VDD power supply, the other end of the magnetic core on-off switch circuit is connected with a first end of a coil of the magnetic core part, and a second end of the coil of the magnetic core part is grounded;
the magnetic core on-off control module comprises a voltage detection unit and an on-off control unit, wherein the voltage detection unit is used for detecting the voltage of the battery to be charged, the output end of the voltage detection unit is connected with the on-off control unit, and the output end of the on-off control unit is connected with the control input end of the magnetic core on-off switch circuit.
As shown in fig. 2, the on-off control unit comprises a reference voltage source and a voltage comparator, wherein the non-inverting input end of the voltage comparator is connected with the output end of the voltage detection unit, the inverting input end of the voltage comparator is connected with the reference voltage source, and the output end of the voltage comparator is connected with the control input end of the magnetic core on-off switch circuit.
The relay is a normally closed relay, is in a closed state in the normal charging process, and the charging interface module is connected with an external power supply and is used for normally charging the battery to be charged through the relay switch component and the battery charging module;
the voltage of the reference voltage source is equal to the full voltage of the battery to be charged, when the battery to be charged is not full, the voltage of the reference voltage source is higher than the voltage of the battery to be charged, the voltage comparator outputs a low level, at the moment, the magnetic core on-off switching circuit is in an off state, the switching part cannot be attracted, and the switching part is kept closed;
when the battery to be charged is fully charged, the circuit voltage of the battery to be charged is higher than the reference voltage source voltage, the voltage comparator outputs a high level to control the on-off switch circuit of the magnetic core to be closed, and the high level signal voltage is generally required to be smaller than the VDD power source voltage, at the moment, the coil of the magnetic core part is electrified, and the magnetic core part generates attraction force, so that the switch part is in an open state, and a charging path (a path from a charging interface to the switch part and then to a battery charging module and the battery to be charged) is opened; and further avoids the harm caused by overcharging the battery to be charged.
In the embodiment of the application, the magnetic core on-off switch circuit comprises a MOS tube M1 and a triode Q1, wherein a source electrode of the MOS tube M1 is connected with a VDD power supply; the drain electrode of the MOS tube M1 is connected with the first end of the coil of the magnetic core part, a first resistor R1 is connected between the source electrode and the drain electrode of the MOS tube M1, the source electrode of the MOS tube M1 is also connected to the collector electrode of the transistor Q1 through a second resistor R2 and a third resistor R3 in sequence, and the grid electrode of the MOS tube M1 is connected between the second resistor R2 and the third resistor R3; the emitter of the transistor Q1 is grounded; the base electrode of the triode Q1 is used as a control input end of the magnetic core on-off switching circuit and is connected with the output end of the voltage comparator.
The MOS tube M1 is a PMOS tube, and the triode Q1 is an NPN triode; the VDD power supply provides any voltage with the voltage range of 5-12V, and the voltage range is specifically selected according to the types and withstand voltage parameters of the MOS tube and the triode;
the utility model uses the switch component of the relay as the switch of the charging path, and controls the on-off of the switch component by controlling the electrifying of the magnetic core part of the relay; the magnetic core on-off switch circuit based on the MOS tube is arranged on a link of the magnetic core part and adopts a VDD power supply with lower voltage, and whether the magnetic core part of the relay is electrified or not is controlled according to a level signal output by the magnetic core control module, so that the on-off of the switch component is controlled, the on-off section of the charging path is indirectly controlled, the voltage in the charging path cannot greatly influence devices in the magnetic core on-off switch circuit, even if the charging interface module inputs high voltage, the charging interface module is not directly connected with the magnetic core on-off switch circuit, damage cannot be caused, and the whole anti-overcharge protection circuit can adapt to charging scenes of various batteries.
Finally, it should be noted that the above is only a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several modifications and adaptations can be made without departing from the principle of the present utility model, and these modifications and adaptations should and are intended to be comprehended within the scope of the present utility model.
Claims (5)
1. An overcharge-preventing power supply protection circuit, which is characterized in that: the device comprises a charging interface module, a charging protection module, a battery charging module, a battery to be charged and a magnetic core on-off control module;
the charging protection module comprises a relay and a magnetic core on-off switch circuit, wherein the relay comprises a magnetic core part and a switch part, and the magnetic core part comprises a magnetic core and a coil wound on the magnetic core;
the charging interface module is connected with the battery charging module through a switch component of the relay, and the battery charging module is connected with a battery to be charged;
one end of the magnetic core on-off switch circuit is connected with a VDD power supply, the other end of the magnetic core on-off switch circuit is connected with a first end of a coil of the magnetic core part, and a second end of the coil of the magnetic core part is grounded;
the magnetic core on-off control module comprises a voltage detection unit and an on-off control unit, wherein the voltage detection unit is used for detecting the voltage of the battery to be charged, the output end of the voltage detection unit is connected with the on-off control unit, and the output end of the on-off control unit is connected with the control input end of the magnetic core on-off switch circuit.
2. The overcharge-preventing power source protection circuit of claim 1 wherein: the on-off control unit comprises a reference voltage source and a voltage comparator, wherein the in-phase input end of the voltage comparator is connected with the output end of the voltage detection unit, the inverting input end of the voltage comparator is connected with the reference voltage source, and the output end of the voltage comparator is connected with the control input end of the magnetic core on-off switch circuit.
3. The overcharge-preventing power source protection circuit of claim 1 wherein: the relay is a normally closed relay.
4. The overcharge-preventing power source protection circuit of claim 2, wherein: the magnetic core on-off switch circuit comprises a MOS tube M1 and a triode Q1, and a source electrode of the MOS tube M1 is connected with a VDD power supply; the drain electrode of the MOS tube M1 is connected with the first end of the coil of the magnetic core part, a first resistor R1 is connected between the source electrode and the drain electrode of the MOS tube M1, the source electrode of the MOS tube M1 is also connected to the collector electrode of the transistor Q1 through a second resistor R2 and a third resistor R3 in sequence, and the grid electrode of the MOS tube M1 is connected between the second resistor R2 and the third resistor R3; the emitter of the transistor Q1 is grounded; the base electrode of the triode Q1 is used as a control input end of the magnetic core on-off switching circuit and is connected with the output end of the voltage comparator.
5. The overcharge-preventing power source protection circuit of claim 4 wherein: the MOS tube M1 is a PMOS tube, and the triode Q1 is an NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322045496.1U CN220342088U (en) | 2023-08-01 | 2023-08-01 | Overcharging-preventing power supply protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322045496.1U CN220342088U (en) | 2023-08-01 | 2023-08-01 | Overcharging-preventing power supply protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220342088U true CN220342088U (en) | 2024-01-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322045496.1U Active CN220342088U (en) | 2023-08-01 | 2023-08-01 | Overcharging-preventing power supply protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220342088U (en) |
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2023
- 2023-08-01 CN CN202322045496.1U patent/CN220342088U/en active Active
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