CN110719097A - Startup and shutdown circuit - Google Patents
Startup and shutdown circuit Download PDFInfo
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- CN110719097A CN110719097A CN201911001529.4A CN201911001529A CN110719097A CN 110719097 A CN110719097 A CN 110719097A CN 201911001529 A CN201911001529 A CN 201911001529A CN 110719097 A CN110719097 A CN 110719097A
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- 230000002265 prevention Effects 0.000 claims abstract description 10
- 230000002035 prolonged effect Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000005669 field effect Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 10
- 230000000087 stabilizing effect Effects 0.000 description 9
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
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- Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a startup and shutdown circuit, comprising: the device comprises a positive and negative electrode prevention unit, a switch unit, a reference value unit, an RC (resistance-capacitance) charging unit and a power supply unit; the output end of the positive and negative pole prevention unit is respectively connected with the switch and the reference value unit and is used for preventing the positive and negative poles of the battery from being exchanged to damage hardware or machines; the output end of the switch unit is directly connected with the reference value unit and used for switching on and switching off; the RC charging unit is also connected with the reference unit and used for maintaining the prolonged starting time; the output end of the reference value unit is connected with the power supply unit and is used for controlling the startup and shutdown operations; and the power supply unit is used for starting or disconnecting a machine power supply connected with the switch circuit. According to the invention, by adopting the technical means of arranging the positive and negative electrode preventing unit, the switch unit, the reference value unit, the RC charging unit and the power supply unit on the switch machine circuit, the technical problems of high manpower and material cost, poor user experience and easy circuit damage in the prior art are solved, and the beneficial effects of reducing the manpower and material cost, enhancing the user experience and preventing the circuit damage are realized.
Description
Technical Field
The invention relates to the field of electric communication, in particular to a power on/off circuit.
Background
Along with the development of science and technology, logic circuits are widely applied and almost occupy various fields, and the logic circuit has the biggest characteristic that the communication purpose can be achieved only by simply transmitting or receiving signals through modules, CPU instructions are not needed or the solution is achieved through software, a power supply is necessary for controlling the logic circuits, the on and off of the power supply are controlled by a switch, and for the on and off of the switch, if the CPU or the software is used for processing, the labor cost and the material cost are increased.
In the prior art, the application occasions of power on and power off are many, for example, the power on and power off method is applied to typical power on and power off processes of some handheld devices such as mobile phones, GPS, IPAD and the like, in a power off state, power on is realized by pressing a power on and power off button for a long time, the power on generally needs several seconds, the user is not well mastered by pressing the time for a long time, and the user experience is poor. And in the power-on state, the soft power-off is realized by long-time pressing of the power-on and power-off key. The control of the startup and shutdown process needs the participation of a main control chip DSP or MCU, but the shutdown signal cannot be responded in the shutdown state of the main control chip, and the shutdown can be performed only by pulling out the battery/power supply, which is very inconvenient, and the system circuit is damaged due to the system power supply shock caused by the battery/power supply plugging and unplugging in the startup state of the system. The other situation is that the power-on and power-off process applied to some desktop equipment such as televisions and displays is started by pressing a power-on and power-off button in a power-off state; and in the power-on state, the power-on and power-off button is pressed to realize power-off. The control of the startup and shutdown process also needs the participation of the main control chip, and the startup and shutdown process is not carried out, and the power supply is turned on and off only by controlling the on-off of the switch through the main control chip responding to the startup and shutdown key signal. The third situation is that the power on/off circuit applied to other equipment directly realizes the on/off of the power supply through a mechanical switch without the participation of a soft-off process and a main control chip, but if the power on/off circuit is used for realizing the on/off of the circuit for providing the power supply, the hardware and the machine can be damaged when the positive and negative poles of the battery are exchanged.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a power on/off circuit, which can reduce manpower and material costs, enhance user experience, and prevent circuit damage.
The technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a power on/off circuit, including:
the device comprises a positive and negative electrode prevention unit, a switch unit, a reference value unit, an RC (resistance-capacitance) charging unit and a power supply unit;
the output end of the positive and negative pole prevention unit is respectively connected with the switch and the reference value unit and is used for preventing the positive and negative poles of the battery from being exchanged to damage hardware or machines;
the output end of the switch unit is directly connected with the reference value unit and used for switching on and switching off;
the RC charging unit is also connected with the reference unit and used for maintaining the prolonged starting time;
the output end of the reference value unit is connected with the power supply unit and is used for controlling the startup and shutdown operations;
and the power supply unit is used for starting or disconnecting a machine power supply connected with the switch circuit.
Further, the battery unit is a detachable battery for providing power supply for the switch circuit.
Further, the positive and negative electrode preventing unit comprises a P-channel MOS field effect transistor.
Further, the reference value unit includes a voltage stabilization chip.
Further, the RC charging unit comprises a first capacitor, a first resistor and a second resistor, and the first capacitor, the first resistor and the second resistor are connected in series.
The invention has the beneficial effects that:
according to the invention, by adopting the technical means of arranging the positive and negative electrode preventing unit, the switch, the reference value unit and the RC charging unit on the switch machine circuit, the technical problems of high manpower and material cost, poor user experience and easy circuit damage in the prior art are solved, and the beneficial effects of reducing the manpower and material cost, enhancing the user experience and preventing the circuit damage are realized.
Drawings
Fig. 1 is a system schematic diagram of an embodiment 1 of a power on/off circuit of the present invention;
fig. 2 is a circuit diagram of an embodiment 2 of the switching on/off circuit of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In one embodiment 1 of the present invention: the overall schematic diagram is shown in fig. 1, and comprises a positive and negative electrode prevention unit, a switch, a reference value unit, an RC charging unit and a power supply unit;
the output end of the positive and negative pole prevention unit is respectively connected with the switch and the reference value unit and is used for preventing the positive and negative poles of the battery from being exchanged to damage hardware or machines;
the output end of the switch unit is directly connected with the reference value unit, wherein the reference value unit comprises a voltage stabilizing chip and is used for switching on and switching off; the purpose of switching on and off is achieved by controlling the on and off of a voltage stabilizing chip in the reference unit; when the voltage is larger than or equal to the reference value, the reference voltage stabilizing chip is conducted to pull down the grid electrode of the P-channel MOS tube, the machine is started, when the voltage is lower than the reference value, the reference voltage stabilizing IC is cut off, the grid electrode of the P-channel MOS tube is high, and the machine is shut down.
The switch unit is also connected with the reference unit through the RC charging unit and is used for prolonging the starting time.
The output end of the reference value unit is connected with the power supply unit and is used for supplying power and cutting off power.
The power supply unit is used for starting or disconnecting a machine power supply connected with the switching circuit, selecting the required low-dropout linear regulator according to the reference value unit, and outputting voltage such as 5V, 3.3V and the like.
In another embodiment 2 of the present invention, the battery unit is further included, specifically, the battery unit is a detachable battery, the detachable battery is generally 9V, and the battery type may be any one of a lithium battery, a polymer battery, a dry battery, or other types for providing a power input.
The positive and negative electrode preventing unit comprises a P-channel MOS field effect transistor.
The positive and negative electrodes are prevented from being exchanged under abnormal conditions such as battery installation, short circuit is prevented, and the circuit is not damaged due to the fact that the positive and negative electrodes are exchanged in the embodiment.
It can be understood that the short circuit phenomenon can occur when the positive electrode and the negative electrode of the direct current are reversely connected. The short circuit of the power supply means that in the circuit, the current does not flow through the electric appliance and is directly connected with the positive pole and the negative pole of the power supply. It is known from ohm's law I-U/R that the current on the circuit will be very large when the power supply is short-circuited, due to the small resistance of the wires. Such large currents, which cannot be borne by batteries or other power sources, can cause power source damage; more seriously, because too much current will raise the temperature of the wire, and in severe cases, it may cause a fire.
More specifically, the following hazards are included:
1. generating large current: sometimes, large currents of tens of thousands or even hundreds of thousands of amperes are generated, so that a large amount of heat is generated to damage equipment, electric arcs melt a plurality of elements for a short time, and meanwhile, the generated currents bring certain electromagnetic force to damage the equipment, and serious fire and damage events can be caused.
2. Resulting in a low voltage: the electrical equipment may not work properly.
3. And others: and interference suppression and system damage stable operation, line loss, heat loss, reactive power and the like increase, and communication are influenced. When short circuit occurs, current flows to an electrical appliance (or a wire) with smaller resistance (or a wire with neglected resistance), so that the short-circuited electrical appliance (or a power supply) cannot work normally.
Specifically, as shown in fig. 2, Q8 is a P-channel diode fet, three pins of Q8 are a drain, a source, and a gate, respectively, where the gate is grounded, the drain is connected to the positive electrode of the battery, voltage difference exists between the drain and the gate, the voltage difference is 9V, Q8 is turned on, and in abnormal situations, for example, the positive and negative electrodes of the battery are reversed, that is, the drain of Q8 is grounded, the voltage between the drain and the gate is 0V, and Q8 is turned off, similarly, the source of Q10 is connected to a point, and the gate of Q10 is connected to B point, and conversely, Q10 is turned off when no voltage difference exists at A, B point.
In another embodiment 3 of the present invention, the features of embodiment 1 can be used in combination with the features of embodiment 2.
In another embodiment 4 of the present invention, the reference value unit includes a voltage stabilization chip, and can be used in combination with one or more of the features of embodiments 1 to 3.
Specifically, as shown in fig. 2, in the circuit, the voltage stabilizing chip of the SOT23 packaging mode is used as the voltage stabilizing chip of the reference unit, so that the plastic package flow channels can be reduced, and the utilization rate of the plastic package material can be improved. The reference value of Q11 is pin 2 voltage, its numerical expression is 2.5V, C point becomes the loop through VBAT1 end to Q11 when pressing switch SW12, before pressing switch SW12, C point voltage equals B point voltage, A, B, C point voltage equals 9V at this moment, 2.5V voltage higher than VBAT1 end as reference value, Q11 is saturated and conducted after pressing SW12, VBAT1 is 2.5V as reference value, wherein the conducting voltage of Q11 is 0.8V, so pin 1 of Q11 is B point 1.7V, the differential pressure between A, B point is 7.3V that the difference between 9V and 1.7V at this moment; the voltage at the point a of the Q10 turn on is equal to the voltage at the VBAT terminal, which corresponds to the power supply supplying power to the load, and the above process is the process of starting up.
Wherein Q11 is a voltage regulator transistor.
Specifically, when the switch SW12 is pressed, which corresponds to the connection of VBAT1 to the point C, the voltage at the point C is equal to 1.7V at the point B, the voltage at the VBAT1 end is lower than the reference value of 2.5V, Q11 is turned off, when the voltage at the point B returns to 9V, there is no voltage difference with the point a, Q10 is also turned off, the VBAT end is 0V, and the power supply is powered off.
It can be understood that no matter the computer is started or shut down, the instruction or software processing of the pull-up and pull-down of the IO ports of the CPU and the single chip microcomputer is used. The main function of the above-mentioned on/off process is the voltage stabilization chip in the reference value unit in this embodiment.
In another embodiment 5 of the present invention, the RC charging unit includes a first capacitor, a first resistor, and a second resistor, which are connected in series.
Specifically, by using the charging time of the resistor and the capacitor, when the charging reaches the value of the reference voltage in embodiment 4, the time for starting up the device is prolonged according to a specific design.
Specifically, the delayed boot time is calculated as follows:
-R C ln ((E-V)/E) wherein "-" is negative, the resistor R and the capacitor C are connected in series, R being in ohms and C being in F; e is the voltage between the series resistor and the capacitor, and V is the voltage to be achieved between the capacitors. ln is a natural logarithm, as shown in fig. 2, the resistors R18 and R19 are connected in series with the capacitor C22, because the voltage at the end of pin 1VBAT1 of Q6 at power-on is 2.5V, pin 2 of Q6 is 2.8V, VBAT charges C22 via R19 and R18, when C22 is from 0V to 2.8, Q6 is turned on, and the base bias voltage of Q6 is 0.3V, so that Q6 is turned on when the emitter of pin 2 of Q6 is turned on to the base of pin 1 from off to saturation, i.e. 0V to 2.8V, and Q9 is also turned on, and the terminal VBAT1 is turned off when the voltage is lower than the reference value of 2.5V, where R19 is a resistor with a resistance of 2M ohms, and the capacitor C22 is a capacitor with a capacitance of 47 microfarads, the time of turning off is calculated as follows:
t ═ 2 × 1000000 × 47/1000000) × ln [ (9-2.8)/9], T ═ 35 seconds. Because the resistance value of the resistor adopted by the R18 is 100 ohms, the resistance value can be ignored compared with the resistance value of the R19;
the Q6 adopts 8550, is a PNP type silicon triode with low voltage, large current and small signal, the Q9 adopts 9013 triode, is a low-power NPN type triode, has the function of current amplification, and can effectively save energy consumption and cost.
The embodiment can accurately obtain the startup and shutdown delay and is also the key of charging delay.
In another embodiment 6 of the present invention, as shown in fig. 1 and 2, includes:
the device comprises a positive and negative electrode prevention unit, a switch, a reference value unit and an RC charging unit;
the output end of the positive and negative pole prevention unit is respectively connected with the switch and the reference value unit and is used for preventing the positive and negative poles of the battery from being exchanged to damage hardware or machines;
the output end of the switch is respectively connected with the reference value voltage stabilizing unit and the RC charging unit and is used for respectively opening and closing the connection between the switch and the reference value voltage stabilizing unit and/or the RC charging and discharging unit;
the output end of the reference value unit is connected with the power supply unit and is used for controlling the on-off operation;
the output end of the RC charging unit is connected with the reference value unit and is used for maintaining the startup extended time.
The battery pack also comprises a battery unit which is a detachable battery, in the embodiment, based on that the power voltage of a logic IC used by people is 5V, the reference value is 2.5V, and the detachable dry battery with 9V of the selected battery is best, so that the battery pack is convenient to use and can be detached when not used, and the battery is saved.
The positive and negative electrode preventing unit comprises a P-channel MOS field effect transistor.
Specifically, the battery flows from the positive electrode to Q8, if the battery is reversed, Q8 is turned off, no current flows, since Q8 and Q10 are both P-channel fets, the drain of Q8 is connected to the positive electrode of the battery, the gate of Q8 is grounded, the source of Q8 is connected to point a, the difference between the drain and gate voltages of Q8 is between 9V and 0V, i.e., 9V, Q8 is in saturation conduction, the source of Q10 is connected to point a, the gate of Q10 is connected to the source of resistor R23, the drain of Q10 is connected to the VBAT terminal for supplying power, the power supply is used as an input terminal, and generally, a low-dropout linear regulator is connected to step down to 5V for supplying power to a load, and a reference cell voltage value is also required to be considered, and is preferably 3.3V, 5V.
The reference value unit comprises a voltage stabilizing chip.
The RC charging unit comprises a first capacitor, a first resistor and a second resistor, wherein the first capacitor, the first resistor and the second resistor are connected in series.
SW12 is connected between C point and VBAT1 end, SW12 pin 1 and pin 3 are connected, SW12 pin 2 and pin 4 are connected, VBAT1 is connected with SW12 pin 1, at the same time it is connected with VBAT end series-connected resistor R16, at the same time it is connected with reference unit voltage-stabilizing chip pin 2 and R17 in parallel and then grounded, VBAT1 end is connected with Q9 collector pin 3, Q9 base pin 1, Q9 and Q9 are formed into constant current, Q9 emitter pin 2 is grounded, Q9 base pin 1 is connected with Q9 collector pin 3, Q9 emitter pin 2 is connected with resistor R9 and R9, at the same time R9 is connected with C9 in series, C9 end is grounded, R9 end is connected with VBAT, SW 9 pin 4 is connected with capacitor C9 and R9 in parallel and then connected with voltage-stabilizing chip pin 1 at B point, C9 is connected with power supply voltage-stabilizing chip, SW 365 is cut off, and power supply is lower than SW 365V 5. R16 and R17 are also connected with the VBAT end of the power supply to divide the voltage to the voltage with the reference value higher than 2.5V.
It can be understood that the pin 2VBAT1 of the reference cell regulator chip Q11 is detected to be high, i.e. higher than 2.5V, C22 is charged with R19 and R18 until 0-2.8V is charged, the emitter pin 2 of Q6 is 0.3V higher than the base pin 1, i.e. the sum of 2.5V and 0.3V, i.e. 2.8V, at this time, Q6 is turned on, and Q9 is also turned on in a saturated manner, the difference between the voltage value of the terminal of VBAT1, i.e. 1.8V, and lower than 2.5V, Q11 is turned off, the voltage at point B returns to 9V, and Q10 is powered off.
It can be understood that, while the SW12 is pressed, the VBAT terminal charges the capacitor C22 through R19 and R18 until Q6 is turned on, Q9 is also turned on, and the VBAT1 terminal is turned off when the voltage is lower than 2.5V; when Q6 is cut off and R19, 18 and C22 are in a charging state, and SW12 is pressed again, the voltage at the point C is 1.8V, SW12 is pressed, the voltage at the point C is equal to the voltage at VBAT1, voltage is 1.8V, voltage is lower than 2.5V, Q11 is cut off, and power supply is cut off by Q10.
It can be understood that the switch SW12 is pressed to turn on the computer, the computer is delayed for 35 seconds to turn off the computer, the time can be set by itself, and the computer is turned off when the switch SW12 is pressed again in the on state, so that the up-and-down instruction or software processing of the IO port without CPU control is realized on hardware, the on-and-off effect is achieved, and the development time and cost are saved.
Specifically, VBAT and VBAT1 in the above embodiments are both power input terminals.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A power on/off circuit, comprising:
the device comprises a positive and negative electrode prevention unit, a switch unit, a reference value unit, an RC (resistance-capacitance) charging unit and a power supply unit;
the output end of the positive and negative pole prevention unit is respectively connected with the switch and the reference value unit and is used for preventing the positive and negative poles of the battery from being exchanged to damage hardware or machines;
the output end of the switch unit is directly connected with the reference value unit and used for switching on and switching off;
the switch unit is also connected with the reference unit through the RC charging unit and is used for maintaining the prolonged starting time;
the output end of the reference value unit is connected with the power supply unit and used for controlling the startup and shutdown operations;
and the power supply unit is used for starting or disconnecting a machine power supply connected with the switch circuit.
2. The switch-on/switch-off circuit as claimed in claim 1, further comprising a battery unit, wherein the battery unit is a removable battery for providing power to the switch circuit.
3. The switch-on/off circuit as claimed in claim 2, wherein the positive/negative electrode preventing unit comprises a P-channel MOS field effect transistor.
4. A switching circuit according to claim 1, characterized in that the switching unit comprises a push switch.
5. The switch-on/switch-off circuit as claimed in claim 1, wherein the reference unit comprises a voltage regulator chip.
6. The switch-on/switch-off circuit as claimed in claim 1, wherein the RC charging unit comprises a first capacitor, a first resistor and a second resistor, and the first capacitor, the first resistor and the second resistor are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911001529.4A CN110719097A (en) | 2019-10-21 | 2019-10-21 | Startup and shutdown circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911001529.4A CN110719097A (en) | 2019-10-21 | 2019-10-21 | Startup and shutdown circuit |
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| CN110719097A true CN110719097A (en) | 2020-01-21 |
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|---|---|---|---|
| CN201911001529.4A Pending CN110719097A (en) | 2019-10-21 | 2019-10-21 | Startup and shutdown circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11122838A (en) * | 1997-10-17 | 1999-04-30 | Nec Corp | Secondary battery protective circuit |
| CN101872971A (en) * | 2010-07-02 | 2010-10-27 | 北京星网锐捷网络技术有限公司 | Reverse-connection preventing circuit, reverse-connection preventing processing method and communication equipment |
| CN203326666U (en) * | 2013-05-29 | 2013-12-04 | 向智勇 | Charging circuit capable of preventing reversal connection of charging power supply |
| CN210927592U (en) * | 2019-10-21 | 2020-07-03 | 深圳市轩宇车鼎科技有限公司 | Startup and shutdown circuit |
-
2019
- 2019-10-21 CN CN201911001529.4A patent/CN110719097A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11122838A (en) * | 1997-10-17 | 1999-04-30 | Nec Corp | Secondary battery protective circuit |
| CN101872971A (en) * | 2010-07-02 | 2010-10-27 | 北京星网锐捷网络技术有限公司 | Reverse-connection preventing circuit, reverse-connection preventing processing method and communication equipment |
| CN203326666U (en) * | 2013-05-29 | 2013-12-04 | 向智勇 | Charging circuit capable of preventing reversal connection of charging power supply |
| CN104218539A (en) * | 2013-05-29 | 2014-12-17 | 惠州市吉瑞科技有限公司 | Charging circuit and charging method capable of preventing reverse connection of rechargeable power supply |
| CN210927592U (en) * | 2019-10-21 | 2020-07-03 | 深圳市轩宇车鼎科技有限公司 | Startup and shutdown circuit |
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