CN220822705U - Wireless charging circuit with turn-off function - Google Patents
Wireless charging circuit with turn-off function Download PDFInfo
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- CN220822705U CN220822705U CN202322247218.4U CN202322247218U CN220822705U CN 220822705 U CN220822705 U CN 220822705U CN 202322247218 U CN202322247218 U CN 202322247218U CN 220822705 U CN220822705 U CN 220822705U
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Abstract
The utility model provides a wireless charging circuit with a turn-off function, which comprises a filter circuit, a triode switch circuit, a protection circuit, a voltage stabilizing circuit, an RLC filter circuit, a MOS tube switch circuit and an RC filter circuit which are connected in sequence; the filter circuit is used for filtering the voltage of the vehicle-mounted storage battery; the triode switch circuit is used for switching on or switching off the MOS tube driving voltage output by the filter circuit according to the charging switch signal; the RLC filter circuit is used for filtering the output charging voltage of the wireless charging transmitter; the MOS tube switching circuit is used for switching on or switching off the charging voltage output by the RLC filter circuit according to the charging switching signal; the RC filter circuit is used for filtering the output charging voltage of the switching circuit. When the non-ideal state such as the internal detection foreign matter and short circuit, can initiatively close the charging, avoid it to the wireless influence that fills of on-vehicle cell-phone, also avoided driving safety to influence simultaneously, and have low-cost advantage.
Description
Technical Field
The utility model belongs to the technical field of automobile electronics, and particularly relates to a wireless charging circuit with a turn-off function.
Background
Along with the development of science and technology and the improvement of living standard of people, the defect of fast power consumption of the mobile phone is more obvious; avoiding the 'worry and distraction' of drivers for finding charging wires by countersinking, and improving driving safety; meanwhile, convenience is increased, and wireless charging requirements of vehicle-mounted mobile phones become more urgent. The wireless charger is a device for charging by utilizing the electromagnetic induction principle, and the principle is similar to that of a transformer, and the wireless charger achieves the purpose of wireless charging by arranging coils at the transmitting end and the receiving end respectively, sending electromagnetic signals to the outside through the coils at the transmitting end under the action of power, receiving the electromagnetic signals through the coils at the receiving end and converting the electromagnetic signals into current. With the fact that the wireless charging power of the vehicle-mounted mobile phone is larger, the safety of the vehicle-mounted mobile phone needs to be re-considered. When the external wireless charging load is a coin or an IC card, a burning condition is easily caused. Meanwhile, when the inside and the outside are in non-ideal conditions, if the charging cannot be cut off, not only energy waste is caused, but also other more serious damages can be caused.
Therefore, in order to avoid damage caused by non-ideal conditions inside and outside, the key of the design of the charging circuit is to have a turn-off function, and an external driving chip is selected to meet the requirement of a power circuit protection function in the current wide use of automobile parts in the market at present, so that the cost is high.
Disclosure of utility model
The utility model aims to solve the technical problem that a wireless charging circuit of a vehicle-mounted mobile phone has a turn-off function, and provides the wireless charging circuit with the turn-off function, which can avoid the influence of some non-ideal conditions on the vehicle-mounted wireless charging caused by the internal and external conditions and has the advantage of low cost.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
A wireless charging circuit with a turn-off function comprises a filter circuit, a triode switch circuit, a protection circuit, a voltage stabilizing circuit, an RLC filter circuit, an MOS tube switch circuit and an RC filter circuit which are connected in sequence; the filter circuit comprises a first capacitor and a second capacitor, the triode switch circuit comprises a first combined triode, the protection circuit comprises a first diode and a first resistor, the voltage stabilizing circuit comprises a second resistor and a first voltage stabilizing tube, the RLC filter circuit comprises a third resistor, a fourth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first inductor, a second inductor and a second diode, the MOS tube switch circuit comprises a first combined MOS tube and a seventh capacitor, and the RC filter circuit comprises a fifth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a sixth resistor and an eleventh capacitor.
The filtering circuit is used for filtering the voltage of the vehicle-mounted storage battery and outputting the driving voltage of the MOS tube;
The triode switch circuit is used for switching on or switching off the MOS tube driving voltage output by the filter circuit according to the charging switch signal;
The protection circuit is used for preventing voltage backflow and current limitation output by the triode switch circuit;
the voltage stabilizing circuit is used for stabilizing voltage and limiting current output by the protection circuit;
The RLC filter circuit is used for filtering the output charging voltage of the NU8040 wireless charging transmitter chip;
The MOS tube switching circuit is used for switching on or switching off the charging voltage output by the RLC filter circuit according to the charging switching signal;
The RC filter circuit is used for filtering the output charging voltage of the switching circuit.
Further limiting the technical scheme of the utility model, the filter circuit comprises a first capacitor and a second capacitor; the first capacitor and the second capacitor are high-frequency capacitors; the first capacitor is connected with the second capacitor in parallel, the first end of the first capacitor is connected with a power supply of the storage battery, the second end of the first capacitor is connected with the ground PGND, and high-frequency filtering is realized by utilizing the charge-discharge principle of the high-frequency capacitor.
Further limiting the technical scheme of the utility model, the triode switch circuit comprises a first combined triode; the first combined triode is an integrated lower-tube NPN and upper-tube PNP triode, the emitting stage of the first combined triode is connected with the first end of the second capacitor, the base electrode of the first combined triode is connected with a charging switch signal, the emitting electrode of the first combined triode is connected with the ground PGND, when no abnormal condition exists in the wireless charging inside and outside of the vehicle-mounted mobile phone is detected, the charging switch signal is input with a high level, the upper and lower tubes of the first combined triode are all in a saturated state, and the collector electrode of the upper tube of the first combined triode outputs the power supply voltage of the storage battery; when detecting that the vehicle-mounted mobile phone is in a wireless charging state, the external and internal abnormal conditions exist, a charging switch signal is input to a low level, the upper tube and the lower tube of the first combined triode are all in a cut-off state, the collector of the upper tube of the first combined triode is not output, and the power supply voltage control of the storage battery is realized by utilizing the switching characteristic of the triode.
Further limiting the technical scheme of the utility model, the protection circuit comprises a first diode and a first resistor; the first end of the first diode is connected with the collector electrode of the upper tube of the first combined triode, the first end of the first resistor is connected with the second end of the first diode, the diode has unidirectional conductivity, and under the normal connection condition, the diode is positively conducted and reversely cut off; the first resistor is a current limiting resistor, and the current is limited by utilizing the impedance characteristic of the first resistor, so that the first combined MOS tube can be prevented from being broken down, and the stable work can be realized.
The technical scheme of the utility model is further defined, and the voltage stabilizing circuit comprises a second resistor and a first voltage stabilizing tube; the second resistor is connected with the first voltage stabilizing tube in parallel, the second end of the second resistor is connected with the second end of the first resistor, and the input voltage is clamped by utilizing the reverse breakdown principle characteristic of the voltage stabilizing diode, so that the voltage is further suppressed; by using the impedance characteristic of the second resistor, the current is limited, the first combined MOS tube can be prevented from being broken down, and the stable operation can be realized.
The technical scheme of the utility model is further defined that the RLC filter circuit comprises a third resistor, a fourth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first inductor, a second inductor and a second diode; the first end of the third resistor is connected with the output SW1 of the wireless charging transmitter, the first end of the third capacitor is connected with the second end of the third resistor, the second end of the third capacitor is connected with the ground PGND, the first end of the fourth capacitor is connected with the first end of the third resistor, the second end of the fourth capacitor is connected with the ground PGND, the first end of the first inductor is connected with the first end of the fourth capacitor, the first end of the fourth resistor is connected with the output SW2 of the wireless charging transmitter, the first end of the fifth capacitor is connected with the second end of the fourth resistor, the second end of the fifth capacitor is connected with the ground PGND, the first end of the sixth capacitor is connected with the first end of the fourth resistor, the second end of the sixth capacitor is connected with the ground PGND, the first end of the second inductor is connected with the first end of the sixth capacitor, and the second end of the second diode is connected with the second end of the second inductor; the charging voltage is filtered by using the characteristics of resistance, capacitance and inductance, and the unidirectional conductivity of the diode is used for unidirectional charging.
Further limiting the technical scheme of the utility model, the MOS tube switch circuit comprises a first combined MOS tube and a seventh capacitor; the first combined MOS tube is an integrated left and right NMOS tube, the grid electrodes of the left and right MOS tubes are connected with the second end of the first voltage stabilizing tube, the source electrodes of the left and right MOS tubes are connected with the first end of the first voltage stabilizing tube, the drain electrodes of the left MOS tube are connected with the second end of the first inductor, and the seventh capacitor is connected between the grid electrodes of the left and right MOS tubes and the source electrodes in parallel; the MOS tube switch and the current characteristic are utilized to realize the function of alternating current charging switch, and the grid electrodes of the left and right MOS tubes are bootstrapped to the conducting voltage by utilizing the capacitance blocking and passing characteristic, so that the MOS is stabilized in the working state.
The technical scheme of the utility model is further defined, and the RC filter circuit comprises a fifth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a sixth resistor and an eleventh capacitor; the first end of the fifth resistor is connected with the drain electrode of the left-way MOS tube of the first combined MOS tube, the first end of the eighth capacitor is connected with the second end of the fifth resistor, the second end of the eighth capacitor is connected with the drain electrode of the left-way MOS tube of the first combined MOS tube, the ninth capacitor is connected in parallel with the tenth capacitor, the first end of the tenth capacitor is connected with the second end of the eighth capacitor, the first end of the sixth resistor is connected with the second end of the tenth capacitor, the first end of the eleventh capacitor is connected with the second end of the sixth resistor, and the second end of the eleventh capacitor is connected with the ground PGND; and filtering the charging voltage signal by utilizing the resistance and capacitance filtering characteristics, so as to stabilize the charging.
The utility model has the beneficial effects that:
1) Through setting up triode switch circuit, realize switching on and turn-off to the power, triode switch circuit receives the switch signal control that charges, detects non-ideal state such as foreign matter and short circuit when the charger is inside, can realize closing the charging, avoids it to the wireless influence that fills of on-vehicle cell-phone, has also avoided driving safety to influence simultaneously, and has low-cost advantage.
2) The wireless charging circuit with the turn-off function is designed, the on-off control of the circuit is simple, the safe charging of the wireless charging of the vehicle-mounted mobile phone can be ensured, the damage of the circuit in the wireless charging system and the abnormal and non-falling condition of charging are prevented, and the safety of the whole charging is ensured.
Drawings
Fig. 1 is a schematic diagram of the principle of the present utility model.
Fig. 2 is a circuit diagram of the present utility model.
Fig. 3 is a charging waveform diagram of the present utility model.
Detailed Description
The utility model will be described in further detail with reference to the drawings and the specific examples.
As shown in fig. 1 and 2, a wireless charging circuit with a turn-off function comprises a filter circuit 1, a triode switch circuit 2, a protection circuit 3, a voltage stabilizing circuit 4, an RLC filter circuit 5, a MOS transistor switch circuit 6 and an RC filter circuit 7 which are connected in sequence;
The filter circuit 1 is used for filtering the voltage of the vehicle-mounted storage battery and outputting the driving voltage of the MOS tube;
The triode switch circuit 2 is used for switching on or switching off the MOS tube driving voltage output by the filter circuit 1 according to the charging switch signal;
The protection circuit 3 is used for preventing the voltage output by the triode switch circuit 2 from flowing backwards and limiting current;
the voltage stabilizing circuit 4 is used for stabilizing and limiting the voltage output by the protection circuit 3;
the RLC filter circuit 5 is used for filtering the output charging voltage of the NU8040 wireless charging transmitter chip;
The MOS tube switching circuit 6 is used for switching on or switching off the charging voltage output by the RLC filter circuit 5 according to the charging switching signal;
the RC filter circuit 7 is used for filtering the output charging voltage of the switching circuit 6.
In this embodiment, the filter circuit 1 includes a first capacitor C1 and a second capacitor C2, where the first capacitor C1 and the second capacitor C2 are both high-frequency capacitors; the first capacitor C1 is connected in parallel with the second capacitor C2, the first end of the first capacitor is connected with the power supply voltage V_BAT of the storage battery, and the second end of the first capacitor is connected with the ground PGND.
In this embodiment, the triode switch circuit 2 includes a first combination triode Q1; the first combined triode is an integrated lower tube NPN and upper tube PNP triode, the upper tube emitter of the first combined triode Q1 is connected with the first end of the second capacitor C2, the base electrode of the lower tube of the first combined triode Q1 is connected with a charging switch signal, and the emitter of the first combined triode is connected with the ground PGND, so that charging switch signal control is realized.
In this embodiment, the protection circuit 3 includes a first diode D1 and a first resistor R1; the first end of the first diode D1 is connected with the collector electrode of the upper tube of the first combined triode Q1, the first end of the first resistor R1 is connected with the second end of the first diode D1, the diode has unidirectional conductivity, and under the normal connection condition, the diode is positively conducted, and is reversely cut off; the first resistor is a current limiting resistor, and the current is limited by utilizing the impedance characteristic of the first resistor, so that the first combined MOS tube can be prevented from being broken down, and the stable work can be realized.
In this embodiment, the voltage stabilizing circuit 4 includes a second resistor R2 and a first voltage stabilizing tube TD1; the second resistor R2 is connected with the first voltage stabilizing tube TD1 in parallel, the second end of the second resistor R2 is connected with the second end of the first resistor R1, and the input voltage is clamped by utilizing the reverse breakdown principle characteristic of the voltage stabilizing diode TD1, so that the voltage is further suppressed; by using the impedance characteristic of the second resistor R2, the current is limited, the first combined MOS tube can be prevented from being broken down, and the stable operation can be realized.
In this embodiment, the RLC filter circuit 5 includes a third resistor R3, a fourth resistor R4, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a first inductor L1, a second inductor L2, and a second diode D2; the first end of the third resistor R3 is connected with the output SW1 of the wireless charging transmitter NU8040Q, the first end of the third capacitor C3 is connected with the second end of the third resistor R3, the second end of the third capacitor C3 is connected with the first end of the third resistor R3, the first end of the fourth capacitor C4 is connected with the first end of the third resistor R3, the second end of the fourth capacitor C4 is connected with the first end of the fourth capacitor C4, the first end of the fourth resistor R4 is connected with the output SW2 of the wireless charging transmitter NU8040Q, the first end of the fifth capacitor C5 is connected with the second end of the fourth resistor R4, the second end of the fifth capacitor C5 is connected with the ground PGND, the first end of the sixth capacitor C6 is connected with the first end of the fourth resistor R4, the second end of the sixth capacitor C6 is connected with the ground PGND, the first end of the second inductor L2 is connected with the first end of the sixth capacitor C6, and the second end of the second diode D2 is connected with the second end of the second inductor L2; the charging voltage is filtered by using the characteristics of resistance, capacitance and inductance, and the unidirectional conductivity of the diode is used for unidirectional charging.
In this embodiment, the MOS transistor switch circuit 6 includes a first combination MOS transistor QM1 and a seventh capacitor C7; the first combined MOS tube QM1 is an integrated left-right NMOS tube, the left-right MOS tube grid of the first combined MOS tube QM1 is connected with the second end of the first voltage stabilizing tube TD1, the left-right MOS tube source of the first combined MOS tube QM1 is connected with the first end of the first voltage stabilizing tube TD1, the left-right MOS tube drain of the first combined MOS tube QM1 is connected with the second end of the first inductor L1, and the seventh capacitor C7 is connected in parallel between the left-right MOS tube grid and the source of the first combined MOS tube QM 1; the MOS tube switch and the current characteristic are utilized to realize the function of alternating current charging switch, and the grid electrodes of the left and right MOS tubes are bootstrapped to the conducting voltage by utilizing the capacitance blocking and passing characteristic, so that the MOS is stabilized in the working state.
In this embodiment, the RC filter circuit 7 includes a fifth resistor R5, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a sixth resistor R6, and an eleventh capacitor C11; the first end of the fifth resistor R5 is connected with the drain electrode of the left MOS tube of the first combined MOS tube QM1, the first end of the eighth capacitor C8 is connected with the second end of the fifth resistor R5, the second end of the eighth capacitor C8 is connected with the drain electrode of the left MOS tube of the first combined MOS tube QM1, the ninth capacitor C9 is connected in parallel with the tenth capacitor C10, the first end of the tenth capacitor C10 is connected with the second end of the eighth capacitor C8, the first end of the sixth resistor R6 is connected with the second end of the tenth capacitor C10, the first end of the eleventh capacitor C11 is connected with the second end of the sixth resistor R6, and the second end of the eleventh capacitor C11 is connected with the ground PGND; and filtering the charging voltage signal by utilizing the resistance and capacitance filtering characteristics, so as to stabilize the charging.
The charging switch signal is input from the outside, and specifically, the charging switch signal is output by an internal microprocessor of the vehicle-mounted wireless charging controller of the automobile.
In fig. 1 and fig. 2, the vehicle-mounted storage battery is in positive connection, wherein v_bat represents an anode access terminal of the vehicle-mounted storage battery, mcu_out_wxc_sw represents a charging switch signal output by an internal microprocessor of the vehicle-mounted wireless charging controller of the vehicle, SW1 and SW2 represent wireless charging transmitter chips output charging signals, and MP-a13 represents a coil.
In this embodiment, the first combination transistor is of type TUMD N, the first capacitor is of type 100nf, the second capacitor is of type 220nf, the third, fifth and eleventh capacitors are of type 2.2nf, the fourth and sixth capacitors are of type 120pf, the seventh capacitor is of type 22nf, the eighth capacitor is of type 1nf, the ninth and tenth capacitors are of type 100nf, the first resistor is of type 470 Ω, the second resistor is of type 10kΩ, the third and fourth resistors are of type 1 Ω, the fifth resistor is of type 51 Ω, the sixth resistor is of type 2.2 Ω, the first and second inductors are of type 1uH, the first combination MOS transistor is of type DMTH LPDQ-13, the first diode is of type BAS516, the second diode is of type BAS516, and the first voltage regulator transistor is of type BZX384-C10.
The voltage of the vehicle-mounted storage battery is set to be 12V, and the test is performed on the embodiment:
1) Test conditions: the vehicle-mounted storage battery is connected positively, abnormal conditions such as foreign matters, short circuits and the like are detected internally, the MCU_OUT_WXC_SW is of a low level, the voltage value is 0V, and charging signals U=0V are generated at two ends of the coil;
2) Test conditions: the vehicle-mounted storage battery is connected positively, the normal working state is detected internally, the MCU_OUT_WXC_SW is in a high level, the voltage value is 5V, the test result is shown in figure 3, and charging signals U=7V and f=100 kHz are generated at two ends of the coil; in fig. 3, the upper and lower curves are waveforms at both ends of the coil, respectively.
Claims (8)
1. A wireless charging circuit with turn-off function, characterized in that: the circuit comprises a filter circuit (1), a triode switch circuit (2), a protection circuit (3), a voltage stabilizing circuit (4), an RLC filter circuit (5), a MOS tube switch circuit (6) and an RC filter circuit (7) which are connected in sequence;
the filter circuit (1) is used for filtering the voltage of the vehicle-mounted storage battery and outputting the driving voltage of the MOS tube;
The triode switch circuit (2) is used for switching on or switching off the MOS tube driving voltage output by the filter circuit (1) according to the charging switch signal;
The protection circuit (3) is used for preventing voltage backflow and current limitation output by the triode switch circuit (2);
The voltage stabilizing circuit (4) is used for stabilizing voltage and limiting current output by the protection circuit (3);
the RLC filter circuit (5) is used for filtering the charging voltage output by the wireless charging transmitter;
The MOS tube switching circuit (6) is used for switching on or switching off the charging voltage output by the RLC filter circuit (5) according to the charging switching signal;
the RC filter circuit (7) is used for filtering the charging voltage output by the switch circuit (6).
2. A wireless charging circuit with turn-off function according to claim 1, wherein: the filter circuit (1) comprises a first capacitor and a second capacitor, wherein the first capacitor and the second capacitor are high-frequency capacitors; the first capacitor is connected with the second capacitor in parallel, one end of the first capacitor is connected with a storage battery power supply, and the other end of the first capacitor is grounded to PGND.
3. A wireless charging circuit with turn-off function according to claim 1, wherein: the triode switch circuit (2) comprises a first combined triode, the first combined triode is an integrated lower tube NPN and upper tube PNP triode, an upper tube emitting stage of the first combined triode is connected with a second capacitor storage battery power supply, the lower tube emitting stage of the first combined triode is connected with ground PGND, and a base electrode of the first combined triode is connected with a charging switch signal.
4. A wireless charging circuit with turn-off function according to claim 1, wherein: the protection circuit (3) comprises a first diode and a first resistor, wherein the positive electrode of the first diode is connected with the collector electrode of the upper tube of the first combined triode, and the negative electrode of the first diode is connected with the first end of the first resistor.
5. A wireless charging circuit with turn-off function according to claim 1, wherein: the voltage stabilizing circuit (4) comprises a second resistor and a first voltage stabilizing tube, the second resistor is connected with the first voltage stabilizing tube in parallel, and two ends of the first voltage stabilizing tube are connected with two ends of the first resistor.
6. A wireless charging circuit with turn-off function according to claim 1, wherein: the RLC filter circuit (5) comprises a third resistor, a fourth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first inductor, a second inductor and a second diode, wherein one end of the fourth resistor is connected with the output SW1 of the wireless charging transmitter, one end of the third capacitor is connected with the two ends of the third resistor, the two ends of the third capacitor are connected with the ground PGND, one end of the fourth capacitor is connected with one end of the third resistor, the two ends of the fourth capacitor are connected with the ground PGND, one end of the first inductor is connected with one end of the fourth capacitor, one end of the fourth resistor is connected with the output SW2 of the wireless charging transmitter, one end of the fifth capacitor is connected with the two ends of the fourth resistor, one end of the sixth capacitor is connected with one end of the fourth resistor, one end of the sixth capacitor is connected with the ground PGND, one end of the second inductor is connected with one end of the sixth capacitor, and the negative electrode of the second diode is connected with the two ends of the second inductor.
7. A wireless charging circuit with turn-off function according to claim 1, wherein: the MOS tube switching circuit (6) comprises a first combined MOS tube and a seventh capacitor, wherein the first combined MOS tube is an integrated left-right two-way NMOS tube, a left-right MOS tube grid electrode G is connected with two ends of a first voltage stabilizing tube, a left-right MOS tube source electrode S is connected with one end of the first voltage stabilizing tube, the seventh capacitor is connected in parallel between the left-right MOS tube grid electrode G and the source electrode S, and a left MOS tube drain electrode D is connected with two ends of a first inductor.
8. A wireless charging circuit with turn-off function according to claim 1, wherein: the RC filter circuit (7) comprises a fifth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a sixth resistor and an eleventh capacitor, wherein one end of the fifth resistor is connected with two ends of the first inductor, one end of the eighth capacitor is connected with two ends of the fifth resistor, two ends of the eighth capacitor are connected with the drain electrode D of the right-path MOS tube of the first combined MOS tube, the ninth capacitor is connected with the tenth capacitor in parallel, one end of the tenth capacitor is connected with the drain electrode D of the right-path MOS tube of the first combined MOS tube, one end of the sixth resistor is connected with two ends of the tenth capacitor, one end of the eleventh capacitor is connected with two ends of the sixth resistor, and two ends of the eleventh capacitor are connected with the ground PGND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322247218.4U CN220822705U (en) | 2023-08-21 | 2023-08-21 | Wireless charging circuit with turn-off function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322247218.4U CN220822705U (en) | 2023-08-21 | 2023-08-21 | Wireless charging circuit with turn-off function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220822705U true CN220822705U (en) | 2024-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322247218.4U Active CN220822705U (en) | 2023-08-21 | 2023-08-21 | Wireless charging circuit with turn-off function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220822705U (en) |
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2023
- 2023-08-21 CN CN202322247218.4U patent/CN220822705U/en active Active
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