CN220858083U - Low-voltage single-button switch circuit - Google Patents
Low-voltage single-button switch circuit Download PDFInfo
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- CN220858083U CN220858083U CN202322423405.3U CN202322423405U CN220858083U CN 220858083 U CN220858083 U CN 220858083U CN 202322423405 U CN202322423405 U CN 202322423405U CN 220858083 U CN220858083 U CN 220858083U
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- 239000003990 capacitor Substances 0.000 claims abstract description 23
- 238000005070 sampling Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 6
- 230000000087 stabilizing effect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000008713 feedback mechanism Effects 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The utility model discloses a low-voltage single-key startup and shutdown circuit, which comprises a battery pack, a battery management chip, an MCU and keys, wherein the battery management chip is respectively and electrically connected with a battery and the MCU of the battery pack, the anode of the battery pack is respectively connected with the emitter of a first triode, one end of a first resistor and one end of a second resistor, the collector of the first triode is connected with the battery management chip after passing through a third diode, the base of the first triode and the other end of the first resistor are respectively connected with the other end of the second resistor and the cathode of the first voltage-stabilizing diode after passing through a first capacitor and a third resistor, the anode of the first voltage-stabilizing diode is connected with the second diode after passing through a fourth diode, the anode of the fourth diode is connected with the cathode of the second diode and the keys, the anode of the second diode is respectively connected with the MCU and the second capacitor which is grounded one by one, and the anode of the second diode is connected with the fourth resistor which is connected with a power supply voltage.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a low-voltage single-button startup and shutdown circuit.
Background
Along with the development of new energy technology, the demand for lithium batteries is increasing, and in general, lithium batteries need to be connected with a lithium battery protection Board (BMS) to be made into lithium battery PACK, and when the lithium battery PACK is used as an energy source to be connected to electric equipment, the product needs to be normally opened and closed. The shutdown is to make the product enter the shutdown state from the standby state, so as to avoid the product being scrapped due to the fact that the lithium battery is deeply discharged and the product cannot be started.
Disclosure of utility model
The utility model aims to provide a low-voltage single-key power-on/off circuit so as to realize separate power-off of key detection areas.
In order to solve the technical problems, the aim of the utility model is realized by the following technical scheme: the battery pack comprises a plurality of batteries which are connected in series, the cathodes of the batteries are respectively connected with the cathodes of the loads and the second ends of the keys after passing through a sampling resistor, the battery management chip is respectively connected with the batteries, the sampling resistor and the MCU, the battery management chip comprises a low-voltage-difference linear voltage stabilizer, the low-voltage-difference linear voltage stabilizer is electrically connected with the MCU, the anodes of the batteries are respectively connected with the emitters of the first triodes, one end of a first resistor and one end of a second resistor, the collectors of the first triodes are respectively connected with the battery management chip after passing through a third diode, the bases of the first triodes and the other ends of the first resistors are respectively connected with the cathodes of the second resistors and the first voltage diode after passing through the first capacitor and the third resistor which are connected in series, the anodes of the first triodes are respectively connected with the anodes of the fourth diodes, the anodes of the first diodes are respectively connected with the anodes of the fourth diodes, and the anodes of the fourth diodes are respectively connected with the anodes of the fourth diodes.
The further technical scheme is as follows: the collector of the first triode is connected with the anode of the third diode through a fifth resistor, and the cathode of the third diode is respectively connected with the battery management chip and a third capacitor which is grounded one by one.
The further technical scheme is as follows: the cathode of the third diode is connected with a second zener diode, the anode of the second zener diode is grounded, and the cathodes of the second zener diode are respectively connected with the battery management chip and the cathode of the third diode.
The further technical scheme is as follows: the MCU is connected with the cathode of the third diode, the other end of the third capacitor and the cathode of the second voltage stabilizing diode after passing through a first diode.
The further technical scheme is as follows: the battery management chip adopts an AFE chip.
The further technical scheme is as follows: the positive pole of group battery passes through behind a first MOS pipe and the second MOS pipe and links to each other with the positive pole of load, battery management chip with the control end of first MOS pipe and the second MOS pipe links to each other.
The further technical scheme is as follows: the drain electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, the grid electrode of the first MOS tube and the grid electrode of the second MOS tube are connected with the battery management chip, the source electrode of the first MOS tube is connected with the positive electrode of the battery pack, and the source electrode of the second MOS tube is connected with the positive electrode of the load.
The further technical scheme is as follows: and the positive electrode of the battery pack is connected with the source electrode of the first MOS tube after passing through a fuse.
The beneficial technical effects of the utility model are as follows: the low-voltage single-key startup and shutdown circuit provided by the utility model is characterized in that the MCU connected with the keys is arranged to detect the separated shutdown according to the pressing time of the keys, so that a complete feedback mechanism is realized, single startup and single shutdown are realized, false triggering of startup and shutdown caused by interference can be effectively avoided, the startup and shutdown state is clear, the battery management chip is arranged to better perform battery management control according to the MCU, the first voltage-stabilizing diode connected with the base electrode of the first triode and the positive electrode of the battery pack respectively is arranged, when the voltage of the positive electrode of the battery pack is similar to the voltage of the first voltage-stabilizing diode, the first triode is turned off and stopped, the startup is not realized when the voltage of the battery is low, the situation that the battery enters deep discharge caused by repeated startup is avoided, meanwhile, the startup can be realized by single pressing of the keys through the first capacitor for isolating direct current voltage is arranged, and the circuit structure is simple.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit diagram of a low-voltage single-button power on/off circuit according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, fig. 1 is a circuit diagram of a low-voltage single-button switch circuit provided by the embodiment of the utility model, the low-voltage single-button switch circuit 10 includes a battery pack, a battery management chip, an MCU, a button SW1, a first triode T1, a second diode D2 and a fourth diode D4, the battery pack includes a plurality of batteries connected in series, the negative pole of the battery pack is respectively connected with the negative pole P-/C-of the load and the second end of the button SW1 through a sampling resistor Rsense, the battery management chip is respectively connected with the battery, the sampling resistor Rsense and the MCU, the battery management chip includes a low-voltage-difference linear voltage regulator electrically connected with the MCU, the battery management chip provides a working voltage of 3.3V to the MCU through the low-voltage-difference linear voltage regulator, the positive pole bat+ of the battery pack is respectively connected with one end of the first triode T1, one end of the first resistor R1 and one end of the second resistor R2, the first triode T1 is respectively connected with the other end of the first triode R1 and the second resistor R1, the other end of the first triode T1 is respectively connected with the first triode T1 and the second triode C1 through the second resistor R1, the other end of the first triode R1 is respectively connected with the second triode C1, the other end of the first triode R1 is connected with the second triode 3, the first triode is connected with the other end of the first resistor 3 and the third triode 3 is provided with the first triode D1, the triode is connected with the cathode 1 through the first triode is 3 and the first resistor is 3, the working voltage is 3 voltage is 3V and the cathode, the anode of the first zener diode DZ1 is connected with the anode of the fourth diode D4, the cathode of the fourth diode D4 is connected with the cathode of the second diode D2, the first end of the key SW1 is respectively connected with the cathode of the fourth diode D4 and the cathode of the second diode D2, the anode of the second diode D2 is respectively electrically connected with the second capacitor C2 and the key detection port of the MCU, which are grounded one by one, after passing through a sixth resistor R6, so that the MCU can recognize whether the key is pressed or not and the pressing time of the key is long, the on-off detection and control can be conveniently performed, a fourth resistor R4, which is connected with a power supply voltage VDD33 one by one, is electrically connected between the anode of the second diode D2 and the sixth resistor R6, and the anode of the second diode D2 and the sixth resistor R6 are both connected with the other end of the fourth resistor R4, which is connected with the power supply voltage VDD 33.
The battery management chip can collect the voltage, the temperature and the current of the single battery, communicate with the MCU, and the on-off port of the battery management chip needs to keep the high level to work normally and shut down the low level. The low-voltage single-key startup and shutdown circuit is characterized in that the MCU connected with the key SW1 after passing through the sixth resistor R6 and the second diode D2 is arranged to detect the separated shutdown according to the pressing time of the key, so that a complete feedback mechanism is realized, the single startup and the single shutdown are realized, the false triggering of startup and shutdown caused by interference can be effectively avoided, the startup and shutdown states are clear, the battery management chip is arranged to better perform battery management control according to the MCU, the first voltage stabilizing diode DZ1 connected with the base electrode of the first triode T1 and the positive electrode BAT+ of the battery pack respectively is arranged, when the voltage of the positive electrode BAT+ of the battery pack is close to the voltage of the first voltage stabilizing diode DZ1, the first triode T1 is turned off and cut off, the situation that the battery pack cannot be started when the voltage is low is realized, the repeated startup is avoided, the battery can be started up by pressing the key for a short time through the first capacitor C1 for isolating the direct current voltage, and the circuit structure is simple.
Specifically, in this embodiment, the collector of the first triode T1 is connected to the anode of the third diode D3 through a fifth resistor R5, and the cathode of the third diode D3 is connected to the battery management chip and the third capacitor C3, which is grounded one by one, respectively.
Specifically, in this embodiment, the cathode of the third diode D3 is connected to a second zener diode DZ2, the anode of the second zener diode DZ2 is grounded, and the cathode of the second zener diode DZ2 is connected to the battery management chip and the cathode of the third diode D3, respectively.
Specifically, in this embodiment, the MCU is connected to the cathode of the third diode D3, the other end of the third capacitor C3, and the cathode of the second zener diode DZ2 through a first diode D1.
Preferably, the battery management chip adopts an AFE chip.
Specifically, in this embodiment, the positive electrode bat+ of the battery pack is connected to the positive electrode p+/c+ of the load after passing through a first MOS tube QT1 and a second MOS tube QT2, and the battery management chip is connected to the control ends of the first MOS tube QT1 and the second MOS tube QT 2.
Specifically, in this embodiment, the drain of the first MOS transistor QT1 is connected to the drain of the second MOS transistor QT2, the gate of the first MOS transistor QT1 and the gate of the second MOS transistor QT2 are connected to the battery management chip, the source of the first MOS transistor QT1 is connected to the positive electrode bat+ of the battery pack, and the source of the second MOS transistor QT2 is connected to the positive electrode p+/c+ of the load.
Specifically, in this embodiment, the positive electrode bat+ of the battery pack is connected to the source electrode of the first MOS QT1 after passing through a fuse FS 1.
Based on the design, during operation, when the key is pressed in the shutdown state, the anode of the fourth diode is connected to the ground, the anode of the battery pack charges the second capacitor through the first resistor, the first capacitor, the third resistor, the first voltage stabilizing diode, the fourth diode and the second diode, the first triode is conducted, the anode of the battery pack provides 3.3V voltage for the battery management chip through the first triode, the fifth resistor, the third diode and the second voltage stabilizing diode, the battery management chip provides 3.3V voltage for the MCU through the low-voltage-difference linear voltage stabilizer, and meanwhile, before the third capacitor is not fully charged, the MCU outputs 3.3V level to the third capacitor through the first diode to charge the third capacitor. When the power-off is needed in the power-on state, after the voltage of the key detection port of the MCU is low, the MCU pulls down the port connected with the battery management chip so as to enable the battery management chip to enter the power-off state, and meanwhile, the low-dropout linear voltage regulator of the battery management chip is also turned off, and the MCU is powered down so that the whole power supply system is powered off. The long-press time of the key needs to exceed the charging time of the starting capacitor, the charging time of the starting capacitor is related to the battery voltage, the charging time of the starting capacitor is long when the battery voltage is high, and the charging time of the starting capacitor is short when the battery voltage is low.
In summary, the low-voltage single-key startup and shutdown circuit provided by the utility model is characterized in that the MCU connected with the keys is arranged to detect the separated shutdown according to the pressing time of the keys, so that a complete feedback mechanism is realized, single startup and single shutdown are realized, false triggering of startup and shutdown caused by interference can be effectively avoided, the startup and shutdown state is clear, the battery management chip is arranged to better perform battery management control according to the MCU, the first voltage-stabilizing diode connected with the base electrode of the first triode and the positive electrode of the battery pack respectively is arranged, when the voltage of the positive electrode of the battery pack is similar to the voltage of the first voltage-stabilizing diode, the first triode is turned off and stopped, the situation that the battery cannot be started when the voltage of the battery pack is low is realized, the situation that the battery enters deep discharge is avoided when the battery is repeatedly started, meanwhile, the first capacitor for isolating direct-current voltage is arranged to realize single-pressing of the keys can be started, and the circuit structure is simple.
While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (8)
1. The utility model provides a low pressure list button switch circuit, its characterized in that includes group battery, battery management chip, MCU, button, first triode, second diode and fourth diode, the group battery includes a plurality of batteries of establishing ties, the negative pole of group battery behind a sampling resistance respectively with the negative pole of load with the second end of button links to each other, the battery management chip respectively with the battery sampling resistance with MCU electricity is connected, the battery management chip includes low pressure difference linear voltage regulator, low pressure difference linear voltage regulator with MCU electricity is connected, the anodal of group battery respectively with the projecting pole of first triode, the one end of first resistor and the one end of second resistor link to each other, the collecting electrode of first triode links to each other with the battery management chip behind first triode and the other end of first resistor all behind first capacitor and the third resistor in series with the other end of second resistor and the cathode of first voltage diode link to each other, the first voltage difference linear voltage regulator is connected with the MCU, the anodal of fourth diode links to each other with the fourth diode has the positive pole termination respectively with the fourth diode links to each other.
2. The low voltage single key switch circuit of claim 1, wherein the collector of the first triode is connected to the anode of the third diode through a fifth resistor, and the cathode of the third diode is connected to the battery management chip and a third capacitor grounded one by one, respectively.
3. The low voltage single key switch circuit of claim 2, wherein the cathode of the third diode is connected to a second zener diode, the anode of the second zener diode is grounded, and the cathodes of the second zener diode are connected to the battery management chip and the cathode of the third diode, respectively.
4. The low voltage single key switch circuit of claim 3, wherein the MCU is connected to the cathode of the third diode, the other end of the third capacitor and the cathode of the second zener diode after passing through a first diode.
5. The low voltage single key power on and off circuit of claim 1, wherein the battery management chip is an AFE chip.
6. The low-voltage single-key power on-off circuit according to claim 1, wherein the positive electrode of the battery pack is connected with the positive electrode of the load after passing through a first MOS tube and a second MOS tube, and the battery management chip is connected with the control ends of the first MOS tube and the second MOS tube.
7. The low-voltage single-key power on-off circuit of claim 6, wherein the drain electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, the grid electrode of the first MOS tube and the grid electrode of the second MOS tube are connected with the battery management chip, the source electrode of the first MOS tube is connected with the positive electrode of the battery pack, and the source electrode of the second MOS tube is connected with the positive electrode of the load.
8. The low-voltage single-button power on-off circuit of claim 7, wherein the positive electrode of the battery pack is connected with the source electrode of the first MOS tube after passing through a fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322423405.3U CN220858083U (en) | 2023-09-06 | 2023-09-06 | Low-voltage single-button switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322423405.3U CN220858083U (en) | 2023-09-06 | 2023-09-06 | Low-voltage single-button switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220858083U true CN220858083U (en) | 2024-04-26 |
Family
ID=90787158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322423405.3U Active CN220858083U (en) | 2023-09-06 | 2023-09-06 | Low-voltage single-button switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220858083U (en) |
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2023
- 2023-09-06 CN CN202322423405.3U patent/CN220858083U/en active Active
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