CN215378525U - Battery protection shield output short circuit protection circuit - Google Patents
Battery protection shield output short circuit protection circuit Download PDFInfo
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- CN215378525U CN215378525U CN202121695326.2U CN202121695326U CN215378525U CN 215378525 U CN215378525 U CN 215378525U CN 202121695326 U CN202121695326 U CN 202121695326U CN 215378525 U CN215378525 U CN 215378525U
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Abstract
The application relates to a battery protection board output short circuit protection circuit, which relates to the technical field of battery protection boards and comprises a battery pack; the switching tube circuit is connected in series with an output loop of the battery pack; the light-emitting piece is connected in series with the output loop of the single battery; the input end of the light sensing element is connected with the light emitting element to receive the photoelectric signal; the input end of the comparison circuit is connected with the light sensing element and is used for comparing the voltage of the light sensing element with a preset reference value; and the control circuit is connected to the output end of the comparison circuit. Because the light-emitting component is connected in series on the output circuit of the battery pack, once the short circuit of the battery pack occurs, the light-emitting component is short-circuited and does not emit light, the voltage of the light-sensing component can change obviously, at the moment, the comparison circuit can output a corresponding control signal, and the control circuit can turn off the switching tube circuit in time after receiving the control signal so as to cut off the power supply of the battery pack. Therefore, the circuit improves the reliability of short-circuit protection.
Description
Technical Field
The application relates to the technical field of battery protection boards, in particular to a battery protection board output short circuit protection circuit.
Background
The battery protection board is an integrated circuit board for protecting the rechargeable battery.
Currently, the protection board generally includes a control IC, a MOS switch, and the like. The control IC controls the MOS switch to be switched on under all normal conditions, so that the battery cell is communicated with an external circuit, and when the voltage of the battery cell or the loop current exceeds a specified value, the control IC can control the MOS switch to be switched off, so that the safety of the battery cell is protected.
With respect to the related art among the above, the inventors consider that the following drawbacks exist: when the electrostatic discharge voltage is too high, the control IC or MOS switch may be damaged, and the integrated circuit may oscillate during a short circuit, so that a situation of untimely protection may occur, and the reliability of protection may be reduced.
SUMMERY OF THE UTILITY MODEL
In order to improve the reliability of protection, the application provides a battery protection board output short-circuit protection circuit.
The application provides a battery protection shield output short-circuit protection circuit adopts following technical scheme:
a battery protection board output short-circuit protection circuit comprising:
a plurality of battery monomers are connected in series to form a battery pack;
the switching tube circuit is connected in series with an output loop of the battery pack;
the light-emitting piece is connected in series on the loop of the battery monomer;
the input end of the light sensing piece is connected with the light emitting piece so as to receive the photoelectric signal;
the input end of the comparison circuit is connected with the photosensitive element and is used for comparing the voltage of the photosensitive element with a preset reference value; and
and the control circuit is connected to the output end of the comparison circuit and is used for controlling the on-off of the switching tube circuit.
Through adopting above-mentioned technical scheme, because the illuminating part is established ties on the free return circuit of battery, in case the condition of battery monomer short circuit appears, the illuminating part will be by the short circuit and luminous, and comparatively obvious change can take place for the voltage of light sensing piece, and at this moment, comparison circuit can export corresponding control signal, and after control circuit received this control signal, can turn off the switch tube circuit in time to the power supply of cutting off the group battery. Therefore, the circuit improves the reliability of short-circuit protection.
Optionally, the light emitting element is a light emitting diode;
the light sensing element is a phototriode, and the base electrode of the light sensing element is connected with the light emitting diode to receive an optical signal; and the input end of the comparison circuit is connected with the output end of the phototriode.
By adopting the technical scheme, when the battery pack is in short circuit, the light emitting diode is in short circuit and does not emit light, and at the moment, the photoelectric triode is switched off, so that the voltage of the output end of the photoelectric triode is greatly changed. At this time, the comparison circuit outputs a corresponding control signal, and the control circuit turns off the switching tube circuit in time after receiving the control signal so as to cut off the power supply of the battery pack. The reliability of short-circuit protection is improved.
Optionally, the comparison circuit includes:
one input end of the comparator is connected with the output end of the phototriode, and the other input end of the comparator is connected with a reference voltage circuit; and the output end of the comparator is connected with the input end of the control circuit.
By adopting the technical scheme, the comparator is used for comparing the voltage of the phototriode with the reference voltage and outputting a corresponding control signal according to a comparison result so as to control the control circuit.
Optionally, the control circuit includes:
the base electrode of the triode is connected with the output end of the comparator; and the output end of the triode is connected with the switching tube circuit.
By adopting the technical scheme, the triode is used for controlling the on-off of the switching tube circuit.
Optionally, the switching tube circuit includes:
the grid electrode of the first field effect transistor is connected with the output end of the triode; and
the grid electrode of the second field effect transistor is connected with the output end of the triode;
the output ends of the first field effect transistor and the second field effect transistor are connected in series.
By adopting the technical scheme, the first field effect transistor and the second field effect transistor are used for controlling the on-off of the output loop of the battery pack.
Optionally, the current-steering resistor is further included, and the current-steering resistor is connected in parallel to two ends of the first field effect transistor and the second field effect transistor.
By adopting the technical scheme, after the problem of the battery pack is repaired, the current can flow through the light-emitting diode and the flow guide resistor again to form a complete loop, and the triode can control the first field effect transistor and the second field effect transistor to be closed, so that the reliability of the circuit is improved.
Optionally, the first field effect transistor is an N-MOS transistor, and a gate of the first field effect transistor is connected to the output end of the triode; the source electrode of the first field effect transistor is connected with the battery pack;
the second field effect transistor is an N-MOS transistor, and the grid electrode of the second field effect transistor is connected with the output end of the triode; the source electrode of the second field effect transistor is connected with the battery pack;
and the drain electrode of the first field effect transistor is connected with the drain electrode of the second field effect transistor.
Optionally, a protection resistor is further connected to an output circuit of the battery pack, and the protection resistor is connected in series with the light emitting diode.
By adopting the technical scheme, because the output voltage of the battery pack is higher, the protection resistor can reduce the breakdown of the light-emitting diode, and the safety is improved.
In summary, the present application at least includes the following beneficial technical effects:
because the illuminating part is connected in series on the output loop of the battery pack, once the condition of the short circuit of the battery monomer occurs, the illuminating part is short-circuited and does not emit light, the voltage of the photosensitive part can change obviously, at the moment, the comparison circuit can output a corresponding control signal, and the control circuit can turn off the switching tube circuit in time after receiving the control signal so as to cut off the output loop of the battery pack. Therefore, the circuit improves the reliability of short-circuit protection.
Drawings
FIG. 1 is an overall circuit schematic of the present application;
fig. 2 is a circuit schematic of the comparison circuit of the present application.
Reference numerals: 1. a switching tube circuit; 2. a comparison circuit; 21. a reference voltage circuit; 3. a control circuit.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
Referring to fig. 1, an embodiment of the present application discloses a battery protection board output short-circuit protection circuit. The battery protection board output short circuit protection circuit comprises a plurality of battery monomers, a switching tube circuit 1, a light-emitting element, a light-sensing element, a comparison circuit 2 and a control circuit 3. A plurality of battery monomers are connected in series to form a battery pack, and a load is connected to an output loop of the battery pack. Switch tube circuit 1 is used for controlling the break-make of group battery output circuit, and whether the light-emitting component is used for detecting the battery monomer and appears the short circuit, and the light sense piece is used for receiving the photoelectricity signal, and comparison circuit 2 is used for detecting the voltage of light sense piece, and control circuit 3 then is used for controlling the break-make of switch tube circuit 1.
Once the battery monomer short circuit occurs, the light emitting element is short-circuited and does not emit light, the voltage of the light sensing element changes obviously, at the moment, the comparison circuit 2 outputs a corresponding control signal, and the control circuit 3 turns off the switching tube circuit 1 in time after receiving the control signal so as to cut off an output loop of the battery pack.
The light emitting element may be a light emitting diode or an indicator light, and in this embodiment, is preferably a light emitting diode D1, in which an anode of the light emitting diode D1 is connected to a positive electrode of the battery cell, and a cathode of the light emitting diode D1 is connected to a negative electrode of the battery cell. In addition, a plurality of protection resistors are connected in series on the loop of the battery cell, two protection resistors are provided in this embodiment, namely a first protection resistor R9 and a second protection resistor R10, and the first resistor R9 and the second resistor R10 are connected to the anode of the light emitting diode D1.
The photo-sensing element is a photo-transistor or a photo-resistor, and in this embodiment, the photo-transistor Q1 is preferred, and the model is an NPN type. The base of the phototransistor Q1 is connected to a light emitting diode D1 to receive an optical electrical signal. The collector of the phototransistor Q1 is coupled to a supply voltage and the emitter of the phototransistor Q1 is grounded. A first voltage dividing resistor R12 is connected in series with the collector of the phototriode Q1.
When the battery monomer works normally, the light emitting diode D1 is normally conducted, and the phototriode Q1 is also normally conducted. Once the battery cell is short-circuited, the led D1 will be short-circuited and will not emit light, and the phototransistor Q1 is turned off, and the voltage at the output terminal will change greatly.
Referring to fig. 2, the comparison circuit 2 includes a comparator N1, a non-inverting input terminal of a comparator N1 is connected to a collector of the phototransistor Q1, and a second voltage dividing resistor is connected in series between the non-inverting input terminal of the comparator N1 and the collector of the phototransistor Q1. The negative phase input terminal of the comparator N1 is connected to the reference voltage circuit 21.
The reference voltage circuit 21 includes a first resistor R1, a second resistor R2, a third resistor R3, and a diode D2. One end of the first resistor R1 is connected to the supply voltage, and the other end is connected to the cathode of the diode D2. The anode of the diode D2 is grounded, and the cathode and the R pole of the diode D2 are connected by a wire. One end of the second resistor R2 is connected to the R pole of the diode D2, and the other end is connected to the negative phase input terminal of the comparator N1. One end of the third resistor R3 is connected to the negative phase input of the comparator N1, and the other end is grounded. The voltage of the reference voltage circuit 21 is set to a preset reference voltage V _ fb by setting the resistance values of the first resistor R1, the second resistor R2, and the third resistor R3.
When the battery pack normally works, the collector voltage of the phototriode Q1 is far lower than the supply voltage. Once the cell is shorted, the phototransistor Q1 turns off and the voltage at its collector will approach the supply voltage. That is, the voltage at the non-inverting input terminal of the comparator N1 is greater than the preset reference voltage V _ fb, and the comparator N1 outputs a high level.
The control circuit 3 includes a transistor Q2, the transistor Q2 in this embodiment is an NPN-type triode, a base of the transistor Q2 is connected to the output terminal of the comparator N1, and a fourth resistor R4 is connected in series between the base of the transistor Q2 and the output terminal of the comparator N1. The collector of the triode Q2 is connected with the power supply voltage, and a fifth resistor R5 is connected in series on the collector. The emitter of the transistor Q2 is grounded, and a sixth resistor R6 is connected between the base and the emitter of the transistor Q2.
Referring to fig. 1 and 2, the switching tube circuit 1 includes a first fet T1 and a second fet T2. The first field effect transistor T1 and the second field effect transistor T2 may be both N-MOS transistors or both P-MOS transistors. The first field effect transistor T1 and the second field effect transistor T2 may be connected to the collector of the transistor Q2 after being connected to the gates of the first field effect transistor T1 and the second field effect transistor T2, or may be connected to the collectors of the transistor Q2 separately. The embodiment of the application is preferably connected with the collector of the transistor Q2 after being connected in common.
The source of the first fet T1 is connected to the battery pack and the drain is connected to the drain of the second fet T2. A seventh resistor R7 is connected between the source and the gate of the second fet T2, an eighth resistor R8 is connected to the source of the second fet T2, and the other end of the eighth resistor R8 is grounded.
Comparator N1 outputs a high level and transistor Q2 is turned on, pulling the collector voltage low. The gates of the first fet T1 and the second fet T2 are turned on to a low level, and the first fet T1 and the second fet T2 are turned off, so that the output circuit of the battery pack is cut off.
The battery protection board output short-circuit protection circuit further comprises a diversion resistor R11, wherein one end of the diversion resistor R11 is connected to the source electrode of the first field-effect transistor T1, and the other end of the diversion resistor R11 is connected to the source electrode of the second field-effect transistor T2. The diversion resistor R11 has a large resistance value, and has the function that after the first field-effect transistor T1 and the second field-effect transistor T2 are turned off and the problem of the battery pack is repaired, current can flow through the light-emitting diode D1 and the diversion resistor R11 again to form a complete loop, and the triode Q2 can control the first field-effect transistor T1 and the second field-effect transistor T2 to be closed.
The implementation principle of the battery protection board output short-circuit protection circuit in the embodiment of the application is as follows:
since the led D1 is connected in series to the output circuit of the battery pack, once the battery cell is shorted, the led D1 is shorted and does not emit light, the photo transistor Q1 is turned off, at this time, the voltage at the positive input terminal of the comparator N1 is greater than the reference voltage V _ fb at the negative input terminal, so that a high level signal is output, and after receiving the high level signal, the base of the transistor Q2 is turned on and pulls down the collector voltage, so as to turn off the first fet T1 and the second fet T2, thereby cutting off the output circuit of the battery pack.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A battery protection board output short circuit protection circuit, comprising:
a plurality of battery monomers are connected in series to form a battery pack;
the switching tube circuit (1) is connected in series with an output loop of the battery pack;
the light-emitting piece is connected in series on the loop of the battery monomer;
the input end of the light sensing piece is connected with the light emitting piece so as to receive the photoelectric signal;
the input end of the comparison circuit (2) is connected with the photosensitive element and is used for comparing the voltage of the photosensitive element with a preset reference value; and
and the control circuit (3) is connected to the output end of the comparison circuit (2) and is used for controlling the on-off of the switching tube circuit (1).
2. The battery protection board output short-circuit protection circuit as claimed in claim 1, wherein the light emitting element is a light emitting diode;
the light sensing element is a phototriode, and the base electrode of the light sensing element is connected with the light emitting diode to receive an optical signal; and the input end of the comparison circuit (2) is connected with the output end of the phototriode.
3. A battery protection board output short-circuit protection circuit according to claim 1, wherein the comparison circuit (2) comprises:
one input end of the comparator is connected with the output end of the phototriode, and the other input end of the comparator is connected with a reference voltage circuit (21); the output end of the comparator is connected with the input end of the control circuit (3).
4. A battery protection board output short-circuit protection circuit according to claim 3, wherein the control circuit (3) comprises:
the base electrode of the triode is connected with the output end of the comparator; the output end of the triode is connected with the switch tube circuit (1).
5. A battery protection board output short-circuit protection circuit according to claim 2, wherein the switching tube circuit (1) comprises:
the grid electrode of the first field effect transistor is connected with the output end of the triode; and
the grid electrode of the second field effect transistor is connected with the output end of the triode;
the output ends of the first field effect transistor and the second field effect transistor are connected in series.
6. The battery protection board output short-circuit protection circuit of claim 5, further comprising a flow-guiding resistor connected in parallel to two ends of the first field effect transistor and the second field effect transistor.
7. The battery protection board output short-circuit protection circuit as claimed in claim 5, wherein the first field effect transistor is an N-MOS transistor, and the gate of the first field effect transistor is connected to the output terminal of the triode; the source electrode of the first field effect transistor is connected with the battery pack;
the second field effect transistor is an N-MOS transistor, and the grid electrode of the second field effect transistor is connected with the output end of the triode; the source electrode of the second field effect transistor is connected with the battery pack;
and the drain electrode of the first field effect transistor is connected with the drain electrode of the second field effect transistor.
8. The battery protection board output short-circuit protection circuit as claimed in claim 2, wherein a protection resistor is further connected to the output circuit of the battery pack, and the protection resistor is connected in series with the light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121695326.2U CN215378525U (en) | 2021-07-24 | 2021-07-24 | Battery protection shield output short circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121695326.2U CN215378525U (en) | 2021-07-24 | 2021-07-24 | Battery protection shield output short circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215378525U true CN215378525U (en) | 2021-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121695326.2U Active CN215378525U (en) | 2021-07-24 | 2021-07-24 | Battery protection shield output short circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215378525U (en) |
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2021
- 2021-07-24 CN CN202121695326.2U patent/CN215378525U/en active Active
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