CN106166990A - A kind of startup power circuit - Google Patents

Abstract

The invention discloses a starting power supply circuit, comprising: a microcontroller, a voltage detection circuit, an internal resistance detection circuit and a controllable switch circuit. When an automobile storage battery is installed in the automobile, the invention can detect the internal resistance of the automobile storage battery and the electric quantity of the storage battery and the health status of the storage battery, and the microcontroller can also control the conduction of the controllable switch circuit, so that the energy storage element of the vehicle can output the starting current to start the vehicle. It can be seen that the starting power supply circuit disclosed in the present invention has the functions of starting the car and detecting the parameters of the car battery at the same time. Therefore, when the car battery cannot provide the starting current, the present invention can also detect the relevant parameters of the car battery while providing the starting current. , to realize the detection of vehicle battery faults, thus effectively solving the problems of time-consuming and labor-intensive manual troubleshooting and low efficiency of troubleshooting.

Description

A starting power supply circuit

technical field

The invention relates to the technical field of automobiles, and more specifically relates to a starting power supply circuit.

Background technique

The car battery, also known as the car battery, can provide a strong starting current to the engine when the vehicle starts the engine. When the car battery is unable to provide the starting current for the vehicle due to some reasons, the car starting power supply will replace the car battery to start and ignite the car.

There are many reasons why the car battery cannot provide the starting current for the vehicle. For example, the car battery is insufficient, the health of the car battery has problems, etc. In the prior art, relevant maintenance personnel are generally required to check the cause of the car battery failure. Time-consuming and labor-intensive, the investigation efficiency is low.

Contents of the invention

In view of this, the present invention discloses a start-up power supply circuit to solve the problems of time-consuming and labor-intensive and low-efficiency troubleshooting in the existing manual troubleshooting of the cause of a car battery failure.

A starting power supply circuit, comprising:

A microcontroller with multiple signal acquisition ports and multiple signal control ports;

The voltage detection circuit whose input terminal is connected to the positive terminal of the automobile storage battery, the output terminal of the voltage detection circuit is connected with the voltage signal acquisition port of the microcontroller, and the voltage signal acquisition port is used to collect the automobile storage battery when the automobile is not started voltage and the vehicle battery voltage when the vehicle starts, wherein the voltage signal collection port is one of the multiple signal collection ports;

The input terminal is connected to the positive terminal of the car battery, the ground terminal is connected to the internal resistance detection circuit of the negative terminal of the car battery, the output terminal of the internal resistance detection circuit is connected to the current signal acquisition port of the microcontroller, and the current signal acquisition port Used to collect the current when the car battery is discharged, wherein the current signal collection port is one of the multiple signal collection ports;

The input end is connected to the common end of the automobile energy storage element and the microcontroller, the output end is connected to the positive end of the automobile storage battery, and the control end of the controllable switch circuit is connected to the microcontroller. A first signal control port, the first signal control port is used to output a conduction control signal for controlling the conduction of the controllable switch circuit, wherein the first signal control port is one of the plurality of signal control ports One;

The second signal control port of the micro-controller is used to output the voltage of the car battery when the car is not started according to the voltage of the car battery when the car is not started, and when the car is started The internal resistance of the car battery, battery power and battery health obtained by the car battery voltage and the current, wherein the second signal control port is one of the plurality of signal control ports.

Preferably, it also includes:

The display circuit is connected with the second signal control port and is used for displaying the internal resistance, the electric quantity of the battery and the health condition of the battery.

Preferably, the voltage detection circuit includes: a first voltage dividing branch, a second voltage dividing branch and a first capacitor;

One end of the first voltage dividing branch is connected to the positive terminal of the car battery, and the other end of the first voltage dividing branch is connected to the ground terminal through the second voltage dividing branch;

The first capacitor is connected in parallel to both ends of the second voltage dividing branch, and the common terminal of the first voltage dividing branch, the second voltage dividing branch and the first capacitor is connected to the voltage Signal collection port.

Preferably, the controllable switch circuit includes: a relay, a diode, a first switch tube, a first resistor and a second resistor;

One end of the normally open contact of the relay is connected to the positive end of the automobile energy storage element, the other end of the normally open contact is connected to the positive end of the automobile battery, and one end of the coil of the relay is connected to the positive end of the automobile energy storage element. terminal, the other end of the coil is connected to the input terminal of the first switch tube, wherein the negative terminal of the vehicle energy storage element is connected to the negative terminal of the vehicle battery;

The control terminal of the first switch tube is connected to the first signal control port through the first resistor, and the output terminal of the first switch tube is connected to the ground terminal through the second resistor;

The anode of the diode is connected to the common end of the coil and the first switch tube, and the cathode of the diode is connected to the positive end of the vehicle energy storage element.

Preferably, the first switch transistor is a MOS transistor.

Preferably, the controllable switch circuit includes: a second switch tube, a third switch tube, a third resistor and a fourth resistor;

The control end of the second switch tube is connected to the first signal control port through the third resistor, the input end of the second switch tube is connected to the input end of the third switch tube, and the second switch tube The output end of the tube is connected to the negative end of the vehicle energy storage element;

The control terminal of the third switching tube is connected to the first signal control port through the fourth resistor, and the output terminal of the third switching tube is connected to the negative terminal of the vehicle battery, wherein the positive terminal of the vehicle energy storage element and The positive end of the car battery is connected.

Preferably, the internal resistance detection circuit includes: a fifth resistor, a fourth switch tube and a sixth resistor;

One end of the fifth resistor is connected to the positive terminal of the car battery, the other end of the fifth resistor is connected to the input end of the fourth switching tube, and the output end of the fourth switching tube is connected to The negative terminal of the car battery, the common end of the fourth switch tube is connected to the enable terminal of the microcontroller, and the common end of the fourth switch tube and the sixth resistor is used as the internal resistance detection circuit The output end is connected to the current signal acquisition port.

Preferably, it further includes: a seventh resistor connected in series between the enable terminal and the fourth switch tube.

Preferably, it further includes: a current limiting resistor, one end of the current limiting resistor is connected to the current signal acquisition port, and the other end of the current limiting resistor is connected to the common end of the fourth switch tube and the sixth resistor.

Preferably, it further includes: a second capacitor, one end of the second capacitor is connected to the common end of the current limiting resistor and the microcontroller, and the other end of the second capacitor is connected to the ground end.

It can be known from the above technical solution that the present invention discloses a starting power supply circuit, including: a microcontroller, a voltage detection circuit, an internal resistance detection circuit and a controllable switch circuit. When a car battery is installed in the car, the present invention can detect the The internal resistance of the battery, the battery capacity and the health status of the battery, and the microcontroller can also control the conduction of the controllable switch circuit, so that the energy storage element of the car can output the starting current to start the car. It can be seen that the starting power supply circuit disclosed in the present invention has the functions of starting the car and detecting the parameters of the car battery at the same time. Therefore, when the car battery cannot provide the starting current, the present invention can also detect the relevant parameters of the car battery while providing the starting current. , to realize the detection of vehicle battery faults, thereby effectively solving the problems of time-consuming and labor-intensive manual troubleshooting and low efficiency of troubleshooting.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those skilled in the art, other drawings can also be obtained according to the disclosed drawings without creative work.

Fig. 1 is a circuit diagram of a starting power supply circuit disclosed by an embodiment of the present invention;

Fig. 2 is a circuit diagram of another starting power supply circuit disclosed by an embodiment of the present invention;

3 is a circuit diagram of a voltage detection circuit disclosed in an embodiment of the present invention;

Fig. 4 is a circuit diagram of a controllable switch circuit disclosed in an embodiment of the present invention;

Fig. 5 is a circuit diagram of another controllable switch circuit disclosed in an embodiment of the present invention;

FIG. 6 is a circuit diagram of an internal resistance detection circuit disclosed by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The embodiment of the invention discloses a start-up power supply circuit to solve the problems of time-consuming and labor-intensive and low-efficiency troubleshooting in the existing manual troubleshooting of the cause of the failure of the vehicle battery.

Referring to FIG. 1 , a circuit diagram of a start-up power supply circuit disclosed by an embodiment of the present invention includes: a microcontroller U1 , a voltage detection circuit 11 , an internal resistance detection circuit 12 and a controllable switch circuit 13 .

in:

The microcontroller U1 has multiple signal acquisition ports and multiple signal control ports.

The input end of the voltage detection circuit 11 is connected to the positive terminal KAR+ of the car battery, and the output end of the voltage detection circuit 11 is connected to the voltage signal acquisition port of the microcontroller U1, and the voltage signal acquisition port is used to collect the car battery voltage and The voltage of the vehicle battery when the vehicle is started, wherein the voltage signal acquisition port is one of the multiple signal acquisition ports of the microcontroller U1.

The input terminal of the internal resistance detection circuit 12 is connected to the positive terminal KAR+ of the automobile battery, the ground terminal of the internal resistance detection circuit 12 is connected to the negative terminal KAR- of the automobile battery, and the output terminal of the internal resistance detection circuit 12 is connected to the current signal acquisition port of the microcontroller U1 , the current signal collection port is used to collect the current when the car battery 10 is discharged, wherein the current signal collection port is one of the multiple signal collection ports of the microcontroller U1.

The input end of the controllable switch circuit 13 is connected to the common end of the automobile energy storage element 20 and the microcontroller U1, the output end of the controllable switch circuit 13 is connected to the positive terminal KAR+ of the automobile battery, and the control end of the controllable switch circuit 13 is connected to the micro The first signal control port of the controller U1, the first signal control port is used to output the conduction control signal for controlling the conduction of the controllable switch circuit 13, wherein the first signal control port is a plurality of signal control ports of the microcontroller U1 one of the.

The second signal control port of the microcontroller U1 is used for when the microcontroller U1 detects the car battery 10, output microcontroller U1 according to the car battery voltage when the car is not started, the car battery voltage and the internal resistance detection when the car is started The current output by the circuit 12 is used to obtain the internal resistance of the car battery 10, the battery capacity and the health status of the battery, wherein the second signal control port is one of the multiple signal control ports of the microcontroller U1.

It should be noted that when the microcontroller U1 does not detect the car battery or detects that the voltage drop rate of the electric car battery is not less than the preset rate, it will also generate a conduction control signal to control the controllable switch circuit 13 to conduct.

For the convenience of understanding, the working principle of the starting power supply circuit is specifically described as follows:

The starting power supply circuit needs to be connected with the energy storage element 20 of the vehicle in practical application.

When the microcontroller U1 detects that the car battery 10 is not installed in the current car (that is, the voltage that the voltage detection circuit 11 outputs to the microcontroller U1 is zero), or the microcontroller U1 detects that the car battery 10 is starting the car (that is, the car battery 10 is When the voltage drop rate of the battery 10 is not less than the preset rate), the microcontroller U1 controls the controllable switch circuit 13 to conduct, so that the energy storage element 20 of the vehicle outputs a starting current to start the vehicle.

It should be noted that if the controllable switch circuit 13 is turned on when the car battery 10 is installed in the car, the car battery 10 and the car energy storage element 20 will be connected in parallel, and they will jointly output a starting current to start the car.

At the same time, when the car battery 10 is installed in the car, the microcontroller can detect the internal resistance of the car battery 10, the battery power and the health status of the battery. The detection process is as follows:

Suppose, when the car is not started, the voltage detection circuit 11 detects that the voltage of the car battery is V ₁ , the voltage of the car battery when the car is started is V ₂ , and the current flowing through the car battery 10 when the car is started is I ₀ ;

Then the internal resistance R' of the car battery 10 = (V ₁ -V ₂ )/I ₀ .

The battery capacity CCA of the car battery 10 = (V ₁ −7.2)*0.7/R′.

The battery state of health of the car battery 10 SOH=(CCA*CCA)/(CCA1*CCA1)*100%, wherein, CCA1 is the nominal CCA value of the new full charge of the car battery 10, and the CCA1 value is sent to the microcontroller by the user U1 input command setting.

In summary, the starting power supply circuit disclosed in the present invention can detect the internal resistance of the car battery 10, the battery power and the health status of the battery when the car battery 10 is installed in the car, and the microcontroller U1 can also control the controllable switch. The circuit 13 is turned on, so that the energy storage element 20 of the vehicle outputs a starting current to start the vehicle. It can be seen that the starting power supply circuit disclosed in the present invention has the functions of starting the car and detecting the parameters of the car battery at the same time. parameters to realize the detection of the faults of the car battery 10, thereby effectively solving the problems of time-consuming and labor-intensive manual troubleshooting and low efficiency of troubleshooting.

In order to further optimize the above embodiment, refer to FIG. 2 , which is a circuit diagram of a start-up power supply circuit disclosed in another embodiment of the present invention. On the basis of the embodiment described in FIG. 1 , it also includes: a display circuit 14;

The display circuit 14 is connected to the second signal control port of the micro-controller U1 for displaying the internal resistance of the car battery 10 , the battery capacity and the health status of the battery.

Wherein, the internal resistance of the car battery 10, battery power and battery health status can also be notified to the user in the form of voice. At this time, it is only necessary to connect the second signal control port of the microcontroller U1 to the voice alarm.

To further optimize the above embodiment, refer to FIG. 3 , which is a circuit diagram of a voltage detection circuit disclosed in an embodiment of the present invention. The voltage detection circuit includes: a first voltage dividing branch, a second voltage dividing branch and a first capacitor C1;

One end of the first voltage dividing branch is connected to the positive terminal KAR+ of the car battery, and the other end of the first voltage dividing branch is connected to the ground terminal through the second voltage dividing branch;

The first capacitor C1 is connected in parallel to both ends of the second voltage dividing branch, and the common end of the first voltage dividing branch, the second voltage dividing branch and the first capacitor C1 is connected to the microcontroller U1 The voltage signal acquisition port VIN_SN, the microcontroller U1 obtains the voltage of the car battery 10 by reading the voltage at the common terminal.

Specifically, the common terminal is connected to an ADC (Analog-to-Digital Converter) inside the microcontroller U1.

Wherein, the first voltage dividing branch can include a resistor (such as R11 shown in FIG. 3 ) or a plurality of resistors connected in series. Similarly, the second voltage dividing branch can include a resistor (such as shown in FIG. 3 R12) or multiple resistors connected in series.

In order to further optimize the above embodiment, refer to FIG. 4 , which is a circuit diagram of a controllable switch circuit disclosed in an embodiment of the present invention. The controllable switch circuit includes: a relay K1, a diode D1, a first switch tube Q1, a first resistor R1 and a first resistor R1. Two resistors R2.

Wherein, one end of the normally open contact of the relay K1 is connected to the positive terminal B+ of the automobile energy storage element, the other end of the normally open contact is connected to the positive terminal KAR+ of the automobile battery, and one end of the coil of the relay K1 is connected to the positive terminal B+ of the automobile energy storage element , the other end of the coil is connected to the input end of the first switching tube Q1, wherein the negative terminal B- of the vehicle energy storage element is connected to the negative terminal KAR- (not shown in the figure) of the vehicle battery;

The control terminal of the first switch tube Q1 is connected to the first signal control port ON/OFF of the microcontroller U1 through the first resistor R1, and the output terminal of the first switch tube Q1 is connected to the ground terminal through the second resistor R2;

The anode of the diode D1 is connected to the common terminal of the coil and the first switch tube Q1, and the cathode of the diode D1 is connected to the positive terminal B+ of the energy storage element of the vehicle.

The working principle of the controllable switch circuit is:

When the first signal control port ON/OFF of the microcontroller U1 outputs a high level, the pins 2 and 3 of the first switch tube Q1 are turned on, and the coil of the relay K1 has current flowing through it, so that the normally open contact of the relay K1 Closed, that is, pin 1 and pin 2 of the relay K1 are turned on; when the first signal control port ON/OFF of the microcontroller U1 outputs a low level, the first switch tube Q1 is turned off, the coil of the relay K1 is de-energized, and the relay K1 The normally open contact of the is open.

Preferably, the first switching transistor Q1 is a MOS transistor.

In order to further optimize the above embodiment, refer to FIG. 5 , which is a circuit diagram of a controllable switch circuit disclosed in another embodiment of the present invention. The controllable switch circuit includes: a second switch tube Q2, a third switch tube Q3, and a third resistor R3 and the fourth resistor R4;

Wherein, the control terminal of the second switching tube Q2 is connected to the first signal control port ON/OFF of the microcontroller U1 through the third resistor R3, and the input terminal of the second switching tube Q2 is connected to the input terminal of the third switching tube Q3. The output terminal of the second switching tube Q2 is connected to the negative terminal B- of the energy storage element of the vehicle;

The control terminal of the third switch tube Q3 is connected to the first signal control port ON/OFF of the microcontroller U1 through the fourth resistor R4, and the output terminal of the third switch tube Q3 is connected to the negative terminal KAR- of the car battery, wherein the car energy storage element The positive terminal B+ is connected to the positive terminal KAR+ of the car battery.

The working principle of the controllable switch circuit is:

When the first signal control port ON/OFF of the microcontroller U1 outputs a high level, the second switch tube Q2 and the third switch tube Q3 are turned on at the same time, and the vehicle energy storage element 20 outputs a starting current to the vehicle; when the microcontroller U1 When the first signal control port ON/OFF outputs a low level, the second switching tube Q2 and the third switching tube Q3 are turned off simultaneously.

Preferably, both the second switching transistor Q2 and the third switching transistor Q3 can be NMOS transistors, or both can be PMOS transistors.

In order to further optimize the above embodiment, refer to FIG. 6 , which is a schematic structural diagram of an internal resistance detection circuit disclosed in an embodiment of the present invention. The internal resistance detection circuit includes: a fifth resistor R5, a fourth switch tube Q4, and a sixth resistor R6;

One end of the fifth resistor R5 is connected to the positive terminal KAR+ of the car battery, the other end of the fifth resistor R5 is connected to the input terminal of the fourth switching tube Q4, and the output terminal of the fourth switching tube Q4 is connected to the negative terminal KAR- of the car battery through the sixth resistor R6. , the common terminal of the fourth switching tube Q4 is connected to the enable terminal TEST_EN of the microcontroller U1, and the common terminal of the fourth switching tube Q4 and the sixth resistor R6 is connected to the current of the microcontroller U1 as the output terminal of the internal resistance detection circuit Signal acquisition port KAR_I.

In order to further optimize the above embodiment, the internal resistance detection circuit may further include:

The seventh resistor R7 is connected in series between the enable terminal TEST_EN and the fourth switch transistor Q4.

In order to further optimize the above embodiment, the internal resistance detection circuit may further include: a current limiting resistor R8;

One end of the current limiting resistor R8 is connected to the current signal acquisition port KAR_I, and the other end of the current limiting resistor R8 is connected to the common end of the fourth switching transistor Q4 and the sixth resistor R6.

To further optimize the above embodiment, the internal resistance detection circuit may further include: a second capacitor C2 for filtering;

One end of the second capacitor C2 is connected to the common end of the current limiting resistor R8 and the microcontroller U1, and the other end of the second capacitor C2 is connected to the ground.

The working principle of the internal resistance detection circuit is:

When the car is not started, the microcontroller U1 detects that the voltage of the car battery is V ₁ through the voltage detection circuit 11, and then the microcontroller U1 outputs a high level to the enable terminal TEST_EN, the fourth switch tube Q4 is turned on, and the car battery 10 A current is generated through the discharge of the fifth resistor R5, the current flows through the sixth resistor R6, and a voltage difference is formed across the sixth resistor R6, the microcontroller U1 obtains the current I ₀ flowing through the car battery 10 through the current signal acquisition port KAR_I, and simultaneously passes The voltage detection circuit 11 detects that the voltage of the car battery is V ₂ at this time, so the microcontroller U1 calculates the internal resistance R′ of the car battery 10 = (V ₁ −V ₂ )/I ₀ . Subsequently, the microcontroller U1 outputs a low level to the enable terminal TEST_EN, and the fourth switching tube Q4 is turned off.

It should be noted that the controller U1 in FIG. 6 includes a controller chip and its peripheral circuits.

Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. a startup power circuit, it is characterised in that including:

Microcontroller, has multiple signals collecting port and multiple signal controls port；

The voltage detecting circuit that input is connected with automobile storage battery anode, the outfan of described voltage detecting circuit and described micro-control The voltage signal acquisition port of device processed connects, described voltage signal acquisition port for gather automobile not actuated time automobile storage battery Automobile storage battery voltage when voltage and automobile starting, wherein, described voltage signal acquisition port is the plurality of signals collecting end In Kou one；

Input is connected with described automobile storage battery anode, and earth terminal connects the internal resistance detection circuit of automobile storage battery negative terminal, described interior The outfan of resistance testing circuit connects the current signal of described microcontroller and gathers port, and described current signal gathers port and is used for Gathering electric current during automobile storage battery electric discharge, wherein, it is in the plurality of signals collecting port that described current signal gathers port One；

Input is connected with the common port of automobile energy storage element and described microcontroller, and outfan is with described automobile storage battery anode even The gate-controlled switch circuit connect, the end that controls of described gate-controlled switch circuit connects the first signal control port of described microcontroller, Described first signal controls port and is used for exporting the conductivity control signal controlling described gate-controlled switch circuit turn-on, wherein, described It is in the plurality of signal control port that first signal controls port；

The secondary signal of described microcontroller controls port and is used for when described microcontroller detects described automobile storage battery, output Described microcontroller according to automobile storage battery voltage when described automobile automobile storage battery voltage time not actuated, described automobile starting and The internal resistance of described automobile storage battery, storage battery electricity and the storage battery health status that described electric current obtains, wherein, described secondary signal controls Port is that the plurality of signal controls in port.

Startup power circuit the most according to claim 1, it is characterised in that also include:

Control port with described secondary signal to be connected, for described internal resistance, described storage battery electricity and described storage battery health status Carry out the display circuit shown.

Startup power circuit the most according to claim 1, it is characterised in that described voltage detecting circuit includes: first point Pressure branch road, the second dividing potential drop branch road and the first capacitor；

One end of described first dividing potential drop branch road connects described automobile storage battery anode, and the other end of described first dividing potential drop branch road passes through institute State the second dividing potential drop branch road and connect earth terminal；

Described first capacitor is connected in the two ends of described second dividing potential drop branch road in parallel, described first dividing potential drop branch road, described second The common port of dividing potential drop branch road and described first capacitor connects described voltage signal acquisition port.

Startup power circuit the most according to claim 1, it is characterised in that described gate-controlled switch circuit includes: relay, Diode, the first switching tube, the first resistance and the second resistance；

One end of the normally opened contact of described relay connects automobile energy storage element anode, and the other end of described normally opened contact connects institute Stating automobile storage battery anode, one end of the coil of described relay connects described automobile energy storage element anode, another of described coil End connects the input of described first switching tube, and wherein, automobile energy storage element negative terminal is connected with described automobile storage battery negative terminal；

The control end of described first switching tube connects described first signal by described first resistance and controls port, and described first opens The outfan closing pipe connects earth terminal by described second resistance；

The anode of described diode connects described coil and the common port of described first switching tube, and the negative electrode of described diode connects Described automobile energy storage element anode.

Startup power circuit the most according to claim 4, it is characterised in that described first switching tube is metal-oxide-semiconductor.

Startup power circuit the most according to claim 1, it is characterised in that described gate-controlled switch circuit includes: second opens Guan Guan, the 3rd switching tube, the 3rd resistance and the 4th resistance；

The control end of described second switch pipe connects described first signal by described 3rd resistance and controls port, and described second opens The input closing pipe is connected with the input of described 3rd switching tube, and the outfan of described second switch pipe connects automobile energy storage unit Part negative terminal；

The control end of described 3rd switching tube connects described first signal by described 4th resistance and controls port, and the described 3rd opens The outfan closing pipe connects described automobile storage battery negative terminal, and wherein, automobile energy storage element anode and described automobile storage battery anode connect.

Startup power circuit the most according to claim 1, it is characterised in that described internal resistance detection circuit includes: the 5th electricity Resistance, the 4th switching tube and the 6th resistance；

One end of described 5th resistance connects described automobile storage battery anode, and the other end of described 5th resistance connects the described 4th and opens Closing the input of pipe, the outfan of described 4th switching tube connects described automobile storage battery negative terminal by described 6th resistance, described The common port of the 4th switching tube connects the public of the Enable Pin of described microcontroller, described 4th switching tube and described 6th resistance Hold the outfan as described internal resistance detection circuit to connect described current signal and gather port.

Startup power circuit the most according to claim 7, it is characterised in that also include: be connected in series in described Enable Pin And the 7th resistance between described 4th switching tube.

Startup power circuit the most according to claim 7, it is characterised in that also include: current-limiting resistance, described current-limiting resistance One end connect described current signal and gather port, the other end of described current-limiting resistance connects described 4th switching tube and described the The common port of six resistance.

Startup power circuit the most according to claim 9, it is characterised in that also include: the second capacitor, described second One end of capacitor connects described current-limiting resistance and the common port of described microcontroller, and the other end of described second capacitor connects Earth terminal.