CN218183041U - Battery pack charging protection circuit based on negative electrode control - Google Patents
Battery pack charging protection circuit based on negative electrode control Download PDFInfo
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- CN218183041U CN218183041U CN202221992195.9U CN202221992195U CN218183041U CN 218183041 U CN218183041 U CN 218183041U CN 202221992195 U CN202221992195 U CN 202221992195U CN 218183041 U CN218183041 U CN 218183041U
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Abstract
The utility model relates to a photovoltaic charge protection technical field provides a battery package charge protection circuit based on negative pole control, adopts divider resistance real-time detection charging equipment's on the interface that charges charging voltage, feeds back to MCU (main control chip) and carries out processing, and output control signal control second switch tube switches on to switch on, thereby switch on the luminescent device of optical coupler, make photosensitive device switch on, short circuit first switch tube is with the charging circuit of following the negative pole shutoff charging equipment of the interface that charges; the switch driving difficulty is reduced, the NMOS tube is used as a main loop heavy current switch, the characteristics of small internal resistance and low voltage drop are achieved, the cost is low, and the safety of a user is effectively ensured.
Description
Technical Field
The utility model relates to a photovoltaic charging protection technical field especially relates to a battery package charging protection circuit based on negative pole control.
Background
Solar energy is an inexhaustible pollution-free green energy given by nature, but has the characteristics of randomness and intermittence.
The solar power supply system consists of a solar cell module, a solar controller and a storage battery (group). The inverter can be configured according to actual needs. Solar energy is a clean renewable new energy source and has a wide role in life and work of people, one of the functions is to convert the solar energy into electric energy, and solar power generation is divided into photo-thermal power generation and photovoltaic power generation. Generally speaking, solar power generation refers to solar photovoltaic power generation, has the characteristics of no moving parts, no noise, no pollution, high reliability and the like, and has a good application prospect in a communication power supply system in a remote area.
In the existing energy storage photovoltaic charging circuit, a safety switch is usually arranged at the anode of a charging interface, but the MOS drive circuit of the switch control scheme is complex, the MOS tube is burnt if the current of the anode of the charging interface cannot be too large, and the anode of the charging interface is turned off by utilizing the MOS tube, so that the control cost is high.
Disclosure of Invention
The utility model provides a battery package charge protection circuit based on negative pole control has solved the comparatively complicated, the higher technical problem of cost of on-off control circuit among the current photovoltaic charging circuit.
For solving the technical problem, the utility model provides a battery package protection circuit that charges based on negative pole control, including the photovoltaic board with the interface that charges, its characterized in that: the device also comprises a switch circuit, a voltage detection circuit, a control circuit and a main control module; the positive terminal of the photovoltaic panel is connected with the positive electrode of the charging interface; the voltage detection circuit is connected with the positive terminal of the photovoltaic panel and is also connected with the charging interface in parallel; the switching circuit is connected in series between the negative electrode end of the photovoltaic panel and the negative electrode of the charging interface, and the signal end of the switching circuit is connected with the positive electrode end; the power supply end of the main control module is connected with the positive end, the input end of the main control module is connected with the voltage detection circuit, and the control end of the main control module is connected with the control circuit; the control circuit is connected with the positive end and the negative end of the photovoltaic panel and is also connected with the signal end of the switch circuit;
when the charging voltage reaches a preset threshold value, the voltage detection circuit feeds the charging voltage of the charging equipment back to the main control module, and the main control module conducts the control circuit to short circuit the switch circuit and disconnect the charging output.
In a further embodiment, the switch circuit includes a first resistor, a second resistor, a third resistor, a first diode, and a first switch, and when the first switch is an N-channel MOS transistor:
the grid electrode of the first switch tube is connected with the positive electrode end through the second resistor and the first resistor, the drain electrode of the first switch tube is connected with the negative electrode of the charging interface, and the source electrode of the first switch tube is connected with the negative electrode end; one end of the third resistor is connected with the grid electrode of the first switching tube, and the other end of the third resistor is connected with the negative electrode end; the first diode is connected in parallel with the third resistor.
In a further embodiment, the control circuit includes a fourth resistor, a fifth resistor, a sixth resistor, an optocoupler, and a second switch, and when the second switch is an NPN transistor:
the base electrode of the second switching tube is connected with the control end of the main control module through the fifth resistor and is connected with the negative electrode of the charging interface through the sixth resistor, the emitting electrode of the second switching tube is connected with the negative electrode of the charging interface, and the collecting electrode of the second switching tube is connected with the pin 2 of the optical coupler; and a pin 1 of the optical coupler is connected with the positive end, a pin 3 of the optical coupler is connected with the negative end, and a pin 4 of the optical coupler is connected between the first resistor and the second resistor.
In a further embodiment, the voltage detection circuit includes a seventh resistor, an eighth resistor, a ninth resistor and a first capacitor, one end of the seventh resistor is connected between the positive electrode and the negative electrode of the charging interface, and the other end of the seventh resistor is connected with the negative electrode of the charging interface through the ninth resistor and is connected with the input end of the main control module through the eighth resistor; first electric capacity one end with host system's input is connected, and the other end is connected with the negative pole of the interface that charges.
In a further embodiment, the main control module comprises a voltage stabilizer, a main control chip, a second capacitor and a third capacitor; the grounding end of the voltage stabilizer is grounded, the output end of the voltage stabilizer is connected with the main control chip, and the input end of the voltage stabilizer is connected with the positive end; one end of the second capacitor is connected with the positive electrode end, and the other end of the second capacitor is grounded; one end of the third capacitor is connected with the output end of the voltage stabilizer, and the other end of the third capacitor is grounded; the input end of the main control chip is connected with the control end, and the control end is connected with the fifth resistor.
In a further embodiment, the voltage regulator is a low dropout linear regulator.
In a further embodiment, the main control chip is an MCU.
In a further embodiment, the optical coupler is a four-pin optical coupler.
The utility model adopts the voltage-dividing resistor to detect the charging voltage of the charging equipment on the charging interface in real time, feeds the charging voltage back to the MCU (main control chip) for processing, outputs a control signal to control the conduction of the second switch tube, thereby switching on the light-emitting device of the optical coupler, leading the light-emitting device to be switched on, and short-circuiting the first switch tube to switch off the charging loop of the charging equipment from the negative pole of the charging interface; the switch driving difficulty is reduced, the NMOS tube is used as a main loop heavy current switch, the characteristics of small internal resistance and low voltage drop are achieved, the cost is low, and the safety of a user is effectively ensured.
Drawings
Fig. 1 is a system framework diagram of a battery pack charging protection circuit based on negative electrode control according to an embodiment of the present invention;
fig. 2 is a circuit diagram of the hardware of fig. 1 provided by an embodiment of the present invention;
wherein: the device comprises a switch circuit 1, a voltage detection circuit 2, a control circuit 3 and a main control module 4;
the circuit comprises a first resistor R1-a ninth resistor R9, a first capacitor C1-a third capacitor C3, a first switch tube Q1, a second switch tube Q2, an optical coupler U1, a voltage stabilizer U2 and a main control chip U3.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings, which are given for illustrative purposes only and are not to be construed as limiting the invention, including the drawings, which are only used for reference and illustration, and which do not constitute limitations to the scope of the invention, since many modifications may be made to the invention without departing from the spirit and scope of the invention.
The embodiment of the utility model provides a battery package charge protection circuit based on negative pole control, as shown in fig. 1, in this embodiment, including photovoltaic board and charging interface, still include switch circuit 1, voltage detection circuit 2, control circuit 3 and main control module 4; the positive terminal of the photovoltaic panel is connected with the positive electrode of the charging interface; the voltage detection circuit 2 is connected with a positive electrode end PV + of the photovoltaic panel and is also connected with the charging interface in parallel; the switch circuit 1 is connected in series between a negative electrode end PV-of the photovoltaic panel and a negative electrode BAT-of the charging interface, and a signal end of the switch circuit is connected with a positive electrode end PV +; the power supply end of the main control module 4 is connected with the positive electrode end PV +, the input end is connected with the voltage detection circuit 2, and the control end is connected with the control circuit 3; the control circuit 3 is connected with the positive pole PV + and the negative pole PV-of the photovoltaic panel and is also connected with the signal end of the switch circuit 1;
when the charging voltage reaches a preset threshold value, the voltage detection circuit 2 feeds the charging voltage of the charging equipment back to the main control module 4, and the main control module 4 switches on the control circuit 3 to short-circuit the switch circuit 1 and disconnect the charging output.
In this embodiment, the preset threshold is a voltage divided by the ninth resistor R9 after the lithium battery is fully charged, or a guard point voltage at AD _ bat.
In this embodiment, the switch circuit 1 includes a first resistor R1, a second resistor R2, a third resistor R3, a first diode, and a first switch Q1, and when the first switch Q1 is an N-channel MOS transistor:
the grid electrode of the first switching tube Q1 is connected with the positive electrode end PV < + > through the second resistor R2 and the first resistor R1, the drain electrode of the first switching tube Q1 is connected with the negative electrode BAT < - > of the charging interface, and the source electrode of the first switching tube Q1 is connected with the negative electrode end PV < - >; one end of the third resistor R3 is connected with the grid electrode of the first switching tube Q1, and the other end of the third resistor R is connected with the negative electrode end PV-; the first diode is connected in parallel with the third resistor R3.
In this embodiment, the control circuit 3 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, an optocoupler U1, and a second switch Q2, and when the second switch Q2 is an NPN transistor:
the base electrode of the second switch tube Q2 is connected with the control end of the master control module 4 through a fifth resistor R5 and connected with the negative electrode BAT-of the charging interface through a sixth resistor R6, the emitting electrode is connected with the negative electrode BAT-of the charging interface, and the collecting electrode is connected with the pin 2 of the optical coupler U1; a pin 1 of the optical coupler U1 is connected with a positive electrode end PV +, a pin 3 is connected with a negative electrode end PV-, and a pin 4 is connected between the first resistor R1 and the second resistor R2.
In this embodiment, the voltage detection circuit 2 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a first capacitor C1, one end of the seventh resistor R7 is connected between the positive electrode BAT + and the positive electrode PV + of the charging interface, and the other end is connected to the negative electrode BAT-of the charging interface through the ninth resistor R9 and connected to the input end of the main control module 4 through the eighth resistor R8; one end of the first capacitor C1 is connected with the input end of the main control module 4, and the other end of the first capacitor C1 is connected with a negative electrode BAT-of the charging interface.
In this embodiment, the main control module 4 includes a voltage stabilizer U2, a main control chip U3, a second capacitor C2, and a third capacitor C3; the grounding end of the voltage stabilizer U2 is grounded, the output end of the voltage stabilizer U2 is connected with the main control chip U3, and the input end of the voltage stabilizer U is connected with the positive electrode end PV +; one end of the second capacitor C2 is connected with the positive electrode end PV +, and the other end of the second capacitor C2 is grounded; one end of the third capacitor C3 is connected with the output end of the voltage stabilizer U2, and the other end of the third capacitor C is grounded; the input end of the main control chip U3 is connected with the control end, and the control end is connected with the fifth resistor R5.
In the present embodiment, the voltage regulator U2 includes, but is not limited to, a low dropout linear regulator U2.
In the present embodiment, the main control chip U3 includes, but is not limited to, an MCU.
In the present embodiment, the optical coupler U1 is a four-pin optical coupler.
The charge protection principle of the embodiment is as follows:
the charging equipment is connected to a charging interface (BAT +, BAT-), the positive terminal PV + outputs voltage to the grid electrode of the first switch tube Q1, the drain electrode and the source electrode of the first switch tube Q1 are conducted, and charging is started.
Thereby photovoltaic power supply positive terminal PV + input stabiliser U2, stabiliser U2 carries out voltage control after will power supply input main control chip U3.
At this moment, the main control chip U3 collects the divided voltage of the charging voltage through the input end (AD sampling end) and the eighth resistor R8, when the main control chip U3 detects that the charging voltage reaches the preset threshold value, that is, when the divided voltage on the ninth resistor R9 or the guard point voltage on the AD _ bat after the lithium battery is fully charged is reached, the main control chip U3 outputs a high level from the control end, controls the second switching tube Q2 to be switched on, the photoelectric coupler to be switched on, lowers the grid potential of the first switching tube Q1, turns off the first switching tube Q1, and disconnects the charging output.
The utility model adopts the voltage-dividing resistor to detect the charging voltage of the charging equipment on the charging interface in real time, the charging voltage is fed back to the MCU (main control chip U3) to be processed, the output control signal controls the conduction of the second switch tube Q2, thereby the light-emitting device of the optical coupler U1 is conducted, the photosensitive device is conducted, the first switch tube Q1 is short-circuited to cut off the charging loop of the charging equipment from the negative electrode BAT of the charging interface; the switch driving difficulty is reduced, the NMOS tube is used as a main loop heavy current switch, the characteristics of small internal resistance and low voltage drop are achieved, the cost is low, and the safety of a user is effectively ensured.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a battery package protection circuit that charges based on negative pole control, includes photovoltaic board and the interface that charges, its characterized in that: the device also comprises a switch circuit, a voltage detection circuit, a control circuit and a main control module; the positive terminal of the photovoltaic panel is connected with the positive electrode of the charging interface; the voltage detection circuit is connected with the positive terminal of the photovoltaic panel and is also connected with the charging interface in parallel; the switching circuit is connected in series between the negative electrode end of the photovoltaic panel and the negative electrode of the charging interface, and the signal end of the switching circuit is connected with the positive electrode end; the power end of the main control module is connected with the positive end, the input end of the main control module is connected with the voltage detection circuit, and the control end of the main control module is connected with the control circuit; the control circuit is connected with the positive electrode end and the negative electrode end of the photovoltaic panel and is also connected with the signal end of the switch circuit;
when the charging voltage reaches a preset threshold value, the voltage detection circuit feeds the charging voltage of the charging equipment back to the main control module, and the main control module conducts the control circuit to short circuit the switch circuit and disconnect the charging output.
2. The negative control-based battery pack charging protection circuit of claim 1, wherein the switch circuit comprises a first resistor, a second resistor, a third resistor, a first diode and a first switch transistor, and when the first switch transistor is an N-channel MOS transistor:
the grid electrode of the first switching tube is connected with the positive electrode end through the second resistor and the first resistor, the drain electrode of the first switching tube is connected with the negative electrode of the charging interface, and the source electrode of the first switching tube is connected with the negative electrode end; one end of the third resistor is connected with the grid electrode of the first switching tube, and the other end of the third resistor is connected with the negative electrode end; the first diode is connected in parallel with the third resistor.
3. The negative control-based battery pack charging protection circuit of claim 2, wherein the control circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, an optocoupler, and a second switch transistor, and when the second switch transistor is an NPN-type transistor:
the base electrode of the second switching tube is connected with the control end of the main control module through the fifth resistor and is connected with the negative electrode of the charging interface through the sixth resistor, the emitting electrode of the second switching tube is connected with the negative electrode of the charging interface, and the collecting electrode of the second switching tube is connected with the pin 2 of the optical coupler; and a pin 1 of the optical coupler is connected with the positive end, a pin 3 of the optical coupler is connected with the negative end, and a pin 4 of the optical coupler is connected between the first resistor and the second resistor.
4. The negative control-based battery pack charging protection circuit of claim 1, wherein: the voltage detection circuit comprises a seventh resistor, an eighth resistor, a ninth resistor and a first capacitor, one end of the seventh resistor is connected between the positive electrode and the negative electrode of the charging interface, and the other end of the seventh resistor is connected with the negative electrode of the charging interface through the ninth resistor and is connected with the input end of the main control module through the eighth resistor; first electric capacity one end with host system's input is connected, and the other end is connected with the negative pole of the interface that charges.
5. The negative control-based battery pack charging protection circuit of claim 3, wherein: the main control module comprises a voltage stabilizer, a main control chip, a second capacitor and a third capacitor; the grounding end of the voltage stabilizer is grounded, the output end of the voltage stabilizer is connected with the main control chip, and the input end of the voltage stabilizer is connected with the positive end; one end of the second capacitor is connected with the positive electrode end, and the other end of the second capacitor is grounded; one end of the third capacitor is connected with the output end of the voltage stabilizer, and the other end of the third capacitor is grounded; the input end of the main control chip is connected with the control end, and the control end is connected with the fifth resistor.
6. The negative control-based battery pack charging protection circuit of claim 5, wherein: the voltage stabilizer is a low dropout linear voltage stabilizer.
7. The negative control-based battery pack charging protection circuit of claim 5, wherein: the main control chip is an MCU.
8. The negative control-based battery pack charging protection circuit of claim 3, wherein: the optical coupler is a four-pin optical coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221992195.9U CN218183041U (en) | 2022-07-28 | 2022-07-28 | Battery pack charging protection circuit based on negative electrode control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221992195.9U CN218183041U (en) | 2022-07-28 | 2022-07-28 | Battery pack charging protection circuit based on negative electrode control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218183041U true CN218183041U (en) | 2022-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221992195.9U Active CN218183041U (en) | 2022-07-28 | 2022-07-28 | Battery pack charging protection circuit based on negative electrode control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218183041U (en) |
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2022
- 2022-07-28 CN CN202221992195.9U patent/CN218183041U/en active Active
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