WO2023051576A1

WO2023051576A1 - Voltage stabilizing circuit for on-board battery power supply, and charging socket for new energy vehicle

Info

Publication number: WO2023051576A1
Application number: PCT/CN2022/122008
Authority: WO
Inventors: 王超
Original assignee: 长春捷翼汽车零部件有限公司
Priority date: 2021-09-28
Filing date: 2022-09-28
Publication date: 2023-04-06
Also published as: CN113672013A

Abstract

A voltage stabilizing circuit for an on-board battery power supply, and a charging socket (71) for a new energy vehicle. The voltage stabilizing circuit comprises: a voltage stabilizing module (61), which has several pins; and a peripheral module. The peripheral module comprises: a filter circuit (621), which is connected to an input pin (8) of the voltage stabilizing module (61), and is used for receiving an on-board battery power supply and for filtering out noise fluctuations of the on-board battery power supply, so as to obtain a direct-current voltage; a pulse switch circuit (622), which is used for receiving a turning-on signal from a driving pin (6) of the voltage stabilizing module (61), so as to generate a pulse voltage; a coupling and rectification circuit (623), which is connected to the pulse switch circuit (622), and is used for coupling the pulse voltage with the direct-current voltage and then performing rectification thereon, so as to obtain a guiding voltage; and a voltage division circuit (624), which is used for dividing the guiding voltage and then feeding same back to a feedback pin (3) of the voltage stabilizing module (61). The voltage stabilizing module (61) controls the duty cycle of the pulse voltage according to a voltage division result until the guiding voltage meets guiding requirements, and adjusts, according to a feedback signal, the driving pin (6) to turn on/off a field-effect transistor (51) so as to adjust the duty cycle of the pulse voltage, such that after the pulse voltage and the on-board battery power supply are coupled and rectified, a stable guiding voltage is obtained.

Description

A voltage stabilizing circuit for a vehicle battery power supply and a charging socket for a new energy vehicle

This application claims the priority of the Chinese patent application submitted on September 28, 2021 with the application number 202111143376.4 and the title of the invention is "A Vehicle Battery Power Supply Voltage Stabilizer Circuit and New Energy Vehicle Charging Socket", the entire content of which is incorporated by reference In this application.

technical field

The invention relates to the technical field of power supply voltage stabilization, and can be used in the field of new energy vehicles, in particular to a vehicle battery power supply voltage stabilization circuit and a charging socket for new energy vehicles.

Background technique

When charging a new energy vehicle, the new energy vehicle needs to input a pilot voltage to the charging pile. When the charging pile recognizes the charging pilot voltage, the charging pile inputs electric energy to the new energy vehicle.

The pilot voltage of new energy vehicles generally provides electric energy for the on-board battery power supply. When the on-board battery power supply fluctuates due to the start and stop of other on-board equipment, the on-board battery power supply can easily fail to provide stable power to the pilot voltage, resulting in pilot voltage Fluctuations, the charging pile cannot recognize the situation of the pilot voltage.

Contents of the invention

In view of the above problems in the prior art, the purpose of this paper is to provide a vehicle battery power supply voltage stabilization circuit and a new energy vehicle charging socket to solve the problem that the vehicle battery in the prior art cannot provide a stable voltage, resulting in the failure of the charging guide to be recognized. The problem that new energy vehicles cannot be charged.

In order to solve the above technical problems, the specific technical solutions of this paper are as follows:

On the one hand, this paper provides a vehicle battery power supply voltage stabilization circuit, including:

The voltage stabilizing module is used to receive the vehicle battery power and has several pins;

The filter circuit is connected to the input pin of the voltage regulator chip, and is used to filter the noise fluctuation of the vehicle battery power supply to obtain the DC voltage;

The pulse switch circuit is used to receive the conduction signal of the driving pin of the voltage stabilizing module to generate a pulse voltage;

A coupled rectification circuit, connected with the pulse switch circuit, is used to couple the pulse voltage with the DC voltage and rectify it into a pilot voltage;

The voltage-dividing sampling circuit is used to divide the pilot voltage and feed it back to the feedback pin of the voltage-stabilizing module. The voltage-stabilizing module is configured to output a variable duty ratio signal according to the voltage-dividing result, so that the voltage-stabilizing circuit is in boost mode or Buck mode to adjust the pilot voltage until the predetermined pilot requirements are met.

As an embodiment of this paper, it also includes:

The soft start circuit is connected to the compensation pin of the voltage stabilizing module, and is used to suppress the inrush current when the voltage stabilizing module receives the vehicle battery power;

The enabling circuit is connected to the clock pin of the voltage stabilizing module, and is used to control the working frequency of the voltage stabilizing module.

As an embodiment of this document, the filter circuit is connected to the input pin, and the filter circuit includes a second capacitor, a third capacitor and a first inductor;

One end of the second capacitor and the third capacitor are connected in parallel, both are connected with the vehicle battery power supply, and the other end is grounded;

One end of the second capacitor connected to the third capacitor is connected to one end of the first inductance, and the other end of the first inductance is connected to the pulse switch circuit.

As an embodiment herein, the pulse switch circuit includes a field effect transistor and a seventh resistor;

The drain of the FET is connected to the first inductor, the gate of the FET is connected to the drive pin, the source of the FET is connected to one end of the seventh resistor, and the other end of the seventh resistor is grounded.

As an embodiment of this paper, a fifth resistor is provided between the source of the field effect transistor and the current detection pin of the voltage stabilizing module, and the end of the fifth resistor far away from the field effect transistor is connected to one end of the eighth capacitor, and the eighth capacitor the other end of the ground;

The current detection pin is used to detect the working current of the FET.

As an embodiment herein, the coupling rectification circuit includes a first capacitor, a second inductor and a Schottky diode;

One end of the first capacitor is connected to the drain of the field effect transistor, the other end is connected to one end of the second inductor, and the other end of the second inductor is grounded;

The connection position of the first capacitor and the second inductor is connected to the anode of the Schottky diode, and the cathode of the Schottky diode is connected to the voltage dividing circuit.

As an embodiment herein, the voltage dividing circuit includes a fourth resistor and a sixth resistor;

One end of the fourth resistor is connected to the cathode of the Schottky diode, the other end of the fourth resistor is connected to one end of the sixth resistor, and the other end of the sixth resistor is grounded;

The connection between the fourth resistor and the sixth resistor is connected to the feedback pin of the voltage stabilizing module.

As an embodiment of this paper, an anti-radiation circuit is also provided between the pulse switch circuit and the coupling rectification circuit;

The anti-radiation circuit includes a second resistor and a fifth capacitor;

One end of the second resistor is arranged between the drain of the field effect transistor and the first capacitor, the other end is connected to one end of the fifth capacitor, and the other end of the fifth capacitor is grounded.

As an embodiment herein, the voltage dividing circuit is further connected in parallel with a seventh capacitor, one end of the seventh capacitor is connected to the cathode of the Schottky diode, and the other end is grounded.

As an embodiment herein, the soft start circuit includes a third resistor, a sixth capacitor and a fourth capacitor;

One end of the third resistor is connected to the compensation pin, the other end is connected to one end of the sixth capacitor, and the other end of the sixth capacitor is grounded;

One end of the fourth capacitor is connected to the compensation pin, and the other end is grounded.

As an embodiment herein, the enabling circuit includes a first resistor;

One end of the first resistor is connected to the clock pin, and the other end receives the enable signal.

As an embodiment herein, the voltage stabilizing module is also provided with an analog ground pin and a power ground pin.

As an embodiment herein, the analog ground pin is used to connect to the analog ground.

As an embodiment herein, the power ground pin is used to connect the ground wire of the rechargeable battery power supply.

As an embodiment herein, the pilot voltage is 12V DC voltage.

As an embodiment of this paper, the boost mode is that the pulse voltage is stored and filtered by the first capacitor, the first inductance is offset, and the Schottky diode is unidirectional;

Wherein, the duty ratio of the pulse voltage is controlled according to the effective voltage at which the Schottky diode is turned on.

As an embodiment of this paper, the step-down mode is that the pulse voltage is stored and filtered by the first capacitor, offset by the second inductance, and the Schottky diode is unidirectional;

On the other hand, this article provides a new energy vehicle charging socket,

receiving charging points; and

Arrange any one of the on-board battery power supply voltage stabilization circuits, and provide a pilot voltage when receiving a charging pile.

Using the above technical solution, the feedback signal received by the feedback pin of the voltage stabilizing module is used to adjust the on-off of the drive pin for the FET, and then adjust the pulse voltage duty cycle. After the pulse voltage is coupled and rectified with the vehicle battery power supply, the obtained The stable pilot voltage can meet the pilot voltage requirements of charging piles for new energy vehicles.

In order to make the above and other objects, features and advantages of this document more comprehensible, preferred embodiments will be described in detail below together with the attached drawings.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of this paper or the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only For some embodiments herein, those skilled in the art can also obtain other drawings based on these drawings without creative effort.

Fig. 1 shows the system topology diagram of a kind of vehicle battery power supply voltage stabilizing circuit of the embodiment of this paper;

FIG. 2 shows a schematic diagram of a voltage stabilizing module of an on-vehicle battery power supply voltage stabilizing circuit according to an embodiment of this paper;

FIG. 3 shows a schematic diagram of a peripheral module of a vehicle battery power supply voltage stabilizing circuit according to an embodiment of this paper;

Fig. 4 shows the circuit principle diagram of a kind of vehicle battery power supply voltage stabilizing circuit of the embodiment of this paper;

Fig. 5 shows the circuit principle diagram of a kind of vehicle battery power supply voltage stabilizing circuit of the embodiment of this paper;

Fig. 6 shows a schematic diagram of the connection relationship between a new energy vehicle charging socket and a charging pile according to the embodiment of this paper.

Explanation of reference symbols:

1. Current detection pin;

2. Compensation pin;

3. Feedback pin;

4. Analog ground pin;

5. Power ground pin;

6. Drive pin;

7. Enable pin;

8. Input pin;

11. The first resistor;

12. The second resistor;

13. The third resistor;

14. The fourth resistor;

15. The fifth resistor;

16. The sixth resistor;

17. The seventh resistor;

21. The first capacitor;

22. The second capacitor;

23. The third capacitor;

24. The fourth capacitor;

25. The fifth capacitor;

26. The sixth capacitor;

27. The seventh capacitor;

28. The eighth capacitor;

31. The first inductance;

32. The second inductance;

41. Schottky diode;

51. Field effect tube;

61. Voltage stabilization module;

621. Filter circuit;

622. Pulse switch circuit;

623. Coupling rectification circuit;

624, voltage divider circuit;

625, soft start circuit;

626. Enable circuit;

627. Anti-radiation circuit;

71. Charging sockets for new energy vehicles;

72. Charging pile.

Detailed ways

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

In the field of new energy vehicles, in order to meet the compatibility of new energy charging in various countries and regions, it is necessary to solve the problems caused by the increase of the on-board battery power of new energy vehicles during the start-stop process of new energy vehicles or during the start-stop process of various software. Load, thus affecting the energy supply status of the rechargeable battery power supply to the pilot voltage, resulting in the problem that the charging pile cannot recognize the 12V pilot voltage of the specified new energy vehicle charging interface when charging the new energy vehicle.

Therefore, this paper provides a voltage stabilizing circuit, through the closed-loop cooperation of the voltage stabilizing module 61 and the peripheral modules, the stable guiding voltage is realized, which ensures that the charging pile can stably identify the charging guide, and greatly enhances the charging efficiency.

The embodiment of this paper provides a system topology diagram of a vehicle battery power supply voltage stabilization circuit as shown in Figure 1, specifically including:

The voltage stabilizing module 61 has several pins;

Peripheral modules, wherein the peripheral modules include:

The filtering circuit 621 is connected to the input pin 8 of the voltage stabilizing module 61, and is used to receive the vehicle battery power supply, and filter the noise fluctuation of the vehicle battery power supply to obtain a DC voltage;

The pulse switch circuit 622 is used to receive the conduction signal of the driving pin 6 of the voltage stabilizing module 61 to generate a pulse voltage;

A coupling rectifier circuit 623, connected to the pulse switch circuit 622, for coupling the pulse voltage with the DC voltage and rectifying it into a pilot voltage;

The voltage divider circuit 624 is used to divide the pilot voltage and feed it back to the feedback pin 3 of the voltage stabilizing module 61. The voltage stabilizing module 61 is configured to output a variable duty ratio signal according to the voltage dividing result, so that the voltage stabilizing circuit is in a rising state. voltage mode or buck mode to adjust the pilot voltage until the predetermined pilot requirements are met.

It should be noted that, as shown in Figure 2, a schematic diagram of a voltage stabilizing module of a vehicle battery power supply voltage stabilizing circuit, the voltage stabilizing module 61 of this article is an eight-pin chip, and the voltage stabilizing module 61 of this article can be the LL3488 of Texas Instruments model chip, and the working voltage of the chip is 3V-40V, the eight pins of the voltage stabilizing module 61 are current detection pin 1, compensation pin 2, feedback pin 3, analog Ground pin 4, power ground pin 5, drive pin 6, enable pin 7 and input pin 8.

The on-board battery power source in this article can come from the voltage of the car power battery after step-down, or from a small battery/battery other than the car power battery, and the small battery/battery can supply power to the additional equipment of the new energy vehicle Additional equipment such as stereos, navigators, air conditioners or lights, etc., when these additional equipment are started and stopped, there is a probability that the output voltage of the small battery/battery will be affected, making the pilot voltage unstable.

The on-board battery power supply in this paper may have clutter or harmonics and other similar non-DC voltages. Therefore, when the on-board battery power supply is stabilized, it is necessary to filter the on-board battery power supply. After filtering, a relatively stable DC voltage is obtained. for its coupling.

In the coupling process of this paper, the technical means of superimposing the pulse voltage of the vehicle battery power supply is used, that is, the DC voltage obtained by the filter circuit 621 and the pulse voltage obtained by the pulse switch circuit are coupled and rectified to obtain the pilot voltage, but the current After the pilot voltage is coupled with a pulse voltage, it may not meet the 12V pilot voltage required by the charging pile, so it is fed back to the feedback pin 3 after being divided by the voltage divider circuit 624. Inside the voltage stabilizing module 61, the feedback pin 3 and There is a corresponding relationship between the drive pin 6, that is, to increase or decrease the voltage received by the feedback signal, the voltage output by the drive pin 6 will have a corresponding change in frequency, and the change in frequency can affect the duty cycle of the pulse voltage, so that in each Under the clock, the pilot voltage will be continuously adjusted until the 12V pilot voltage required by the charging pile is obtained, and in this article, the frequency of the clock is controlled by the enable pin 7, and the order of magnitude of the clock is very small, and the clock affects the pulse voltage. The speed of generation, the charging pile can get the 12V charging guide voltage in a very short time

As an embodiment of this paper, a schematic diagram of a peripheral circuit of a vehicle battery power supply voltage stabilization circuit as shown in Figure 3 also includes:

The soft start circuit 625 is connected to the compensation pin 2 of the voltage stabilizing module 61, and is used to suppress the surge current when the voltage stabilizing module 61 receives the vehicle battery power supply. The current characteristics have a great influence on various filter devices or rectifier devices, so in high-power electrical equipment, it is necessary to add a soft-start circuit 625, so inside the voltage stabilizing module 61, there is an input pin 8 And when the compensation pin 2 is turned on, a large resistor and a large capacitor are added to the compensation pin 2 to eliminate when the input pin 8 is turned on, when there is a sudden voltage with a large peak value, the large resistor It can increase its input impedance, remove the load, and reduce the start-up current. Therefore, the soft-start circuit 625 has the following establishment principle, that is, the load is removed at the moment of power-on, and the useful current is limited at the same time. When the voltage stabilizing module 61 is turned on , the load of the voltage stabilizing module 61 is changed from the peripheral circuit to the soft-start circuit 625, and after the surge current is eliminated, the load is changed from the soft-start circuit 625 to the peripheral circuit, wherein the soft-start circuit 625 and the inside of the voltage stabilizing module 61 The switching source circuit corresponding to the input pin 8 is independent of each other and can be regarded as a peripheral circuit, and the soft start circuit 625 can be designed according to actual needs, such as a power thermistor circuit, a rectifier tube-resistor circuit, a power-off The detected rectifier-resistor circuit, relay-resistor circuit or relay-current-limiting resistor circuit using a timing trigger, so in order to reduce costs and improve the adaptability of the circuit, the most basic capacitor-resistor type is used in this paper. The soft start circuit 625, but those skilled in the art can conceive the above-mentioned several soft start circuits 625 according to the needs. This paper does not limit the type of the soft start circuit 625. Any circuit that can perform soft start should belong to the protection of this paper. scope.

The enabling circuit 626 is connected to the enabling pin 7 of the voltage stabilizing module 61, and is used to control the operating frequency of the voltage stabilizing module 61. can, and the low-level voltage value input to the voltage stabilizing module 61 can affect the working state of the voltage stabilizing module 61 in this paper, but the specific influence method is determined by the internal composition of the voltage stabilizing module 61, so it will not be repeated here. .

The enabling circuit 626 can be a bridge circuit connected to an external microcontroller or MCU. By changing the impedance of the enabling circuit 626, the working frequency of the voltage stabilizing module 61 can be changed, thereby affecting the clock frequency of the pulse voltage.

It should be noted that, according to the above-mentioned various circuits, a voltage stabilizing circuit for a vehicle battery power supply can already be constructed, as shown in FIG. Pin 2 is connected with a soft-start circuit 625, wherein the soft-start circuit 625 is composed of a third resistor 13 and a sixth capacitor 26, one end of the third resistor 13 is connected to the compensation pin 2, and the other end is connected to one end of the sixth capacitor 26, the sixth The other end of the capacitor 26 is grounded.

The enable pin 7 of the voltage stabilizing module 61 is connected to one end of the first resistor 11 of the pull-up resistor, and the other end of the first resistor 11 is connected to the control terminal, such as a single-chip microcomputer or MCU.

The analog ground pin 4 and the power ground pin 5 of the voltage stabilizing module 61 are respectively connected to the analog ground and the power ground.

The input pin 8 of the voltage stabilizing module 61 is connected to the vehicle battery power supply of the new energy vehicle or the vehicle battery power supply after step-down, and the input pin 8 is also connected to the first inductor 31, and the first inductor 31 performs impedance for the vehicle battery power supply, according to Secondary law, reduce the impact of the abrupt voltage on the circuit, the other end of the first inductance 31 is connected to the drain of the field effect transistor 51, the gate of the field effect transistor 51 is connected to the drive pin 6 of the voltage stabilizing module 61, and the field effect The source of the tube 51 is connected to the seventh resistor 17, which serves as a current detection function for the field effect tube 51, the other end of the seventh resistor 17 is grounded, and the drain of the field effect tube 51 is also connected to a coupling rectifier circuit 623 for coupling rectification. The circuit 623 includes a first capacitor 21, a second inductor 32 and a Schottky diode 41. One end of the first capacitor 21 is connected to the drain of the field effect transistor 51, and the other end of the first capacitor 21 is connected to one end of the second inductor 32. The other end of the second inductance 32 is grounded, the junction of the second inductance 32 and the first capacitor 21 is connected to the anode of the Schottky diode 41, and the Schottky diode 41 is connected to one end of the voltage dividing circuit 624, and passes through the first capacitor 21 and the second capacitor. After the two inductors 32 are coupled, the adjusted DC voltage is obtained through the half-wave rectification of the Schottky 41, but the voltage may not be 12V, so it needs to be fed back by the voltage divider circuit 624, and adjusted again in the next clock cycle. The voltage circuit 624 is formed by connecting the fourth resistor 14 and the sixth resistor 16 in series, the connection position of the fourth resistor 14 and the sixth resistor 16 is connected to the feedback pin 3 of the voltage stabilizing module, and the feedback pin 3 can adjust the driving pin 6 for the field The turn-on frequency of the effect transistor 51 can further adjust the duty ratio of the pulse voltage, so the voltage value of the DC voltage rectified by the Schottky diode 41 can be adjusted again until the requirement of the pilot voltage 12V is met.

On the other hand, the embodiment of this paper also provides a circuit schematic diagram of a vehicle battery power supply voltage stabilization circuit as shown in Figure 5, and provides the parameters of the electronic components related to the voltage stabilization module 61 and the optimal connection method. In this circuit The anti-radiation circuit 627, π-type filter circuit, and current detection circuit are added in the schematic diagram, which can meet the working conditions of a voltage stabilizing module 61 in this paper, and realize the final mass production.

The filter circuit 621 is connected to the input pin 8 of the voltage stabilizing module 61, and the filter circuit 621 includes the second capacitor 22, the third capacitor 23 and the first inductor 31;

One end of the second capacitor 22 and the third capacitor 23 are connected in parallel, both are connected with the vehicle battery power supply, and the other end is grounded;

One end of the second capacitor 22 connected to the third capacitor 23 is connected to one end of the first inductor 31 , and the other end of the first inductor 31 is connected to the pulse switch circuit 622 .

It should be noted that the filter circuit 621 in this paper is a π-type filter circuit, that is, an LC type. The function of the filter circuit 621 is to remove unnecessary harmonics. In a DC power supply, it is to reduce the current ripple and make the current more stable. Smooth, the second capacitor 22 is 0.1F, the third capacitor 23 is 10μF, and the first inductor 31 is 47μH.

It should be noted that those skilled in the art can obtain corresponding filtering effects by adjusting the filter circuit 621 to be an LC or RC circuit according to the input and output impedances, so the filter circuit 621 in this paper should be equivalently replaced by a circuit capable of filtering. Therefore, the filter circuit 621 may not be limited herein.

As an embodiment herein, the pulse switch circuit 622 includes a field effect transistor 51 and a seventh resistor 17;

The drain of the field effect transistor 51 is connected to the first inductor 31, the gate of the field effect transistor 51 is connected to the drive pin 6, the source of the field effect transistor 51 is connected to one end of the seventh resistor 17, and the other end of the seventh resistor 17 One end is grounded.

It should be noted that the model of the field effect transistor 51 in this paper is DMN6140, and the seventh resistor 17 is 0.16Ω. The gate of the field effect transistor 51 is connected to the drive pin 6, so that the output can be output according to the signal sent by the drive pin 6. Pulse voltages with different duty ratios.

As an embodiment herein, a fifth resistor 15 is provided between the source of the field effect transistor 51 and the current detection pin 1 of the voltage stabilizing module 61, and the end of the fifth resistor 15 far away from the field effect transistor 51 is connected to the eighth capacitor 28 One end of the eighth capacitor 28 is grounded;

The current detection pin 1 is used to detect the working current of the field effect transistor 51 .

It should be noted that the current detection pin 1 can accurately obtain the working current of the field effect transistor 51, and then obtain the working voltage of the field effect transistor 51 according to the resistance value of the fifth resistor 15. In this paper, the resistance of the fifth resistor 15 The value is 100Ω. For example, the detection current obtained by the current detection pin 1 is 0.02A, then the evaluation working voltage of the current FET 51 is 2V, so through the current detection pin 1, the maintenance personnel of the new energy vehicle can conveniently The working status of the field effect tube 51 can be obtained, and it is convenient for maintenance.

As an embodiment herein, the coupling rectification circuit 623 includes a first capacitor 21, a second inductor 32 and a Schottky diode 41;

One end of the first capacitor 21 is connected to the drain of the field effect transistor 51, the other end is connected to one end of the second inductance 32, and the other end of the second inductance 32 is grounded;

The connection position of the first capacitor 21 and the second inductor 32 is connected to the anode of the Schottky diode 41 , and the cathode of the Schottky diode 41 is connected to the voltage dividing circuit 624 .

It should be noted that the coupling rectification circuit 623 herein has a coupling rectification function, but it is only the simplest coupling rectification circuit 623. Those skilled in the art can adjust the device configuration of the coupling rectification circuit 623 according to the pricing of new energy vehicles, and The model of the Schottky diode 41, the model of the Schottky diode 41 in this article is MBRS130LT3, the first capacitor 21 is 10μF, and the second inductor is 40μH. First, the vehicle battery power supply has been filtered to a stable DC voltage, so only need After the coupling of the first capacitor 21 and the second inductance 32, a positive and negative pulse voltage greater than the output of the field effect transistor can be obtained. After obtaining this pulse voltage, after passing through the one-way filter device of the one-way bridge type, this paper One Schottky diode 41 is selected for one-way filtering. In this field, a bridge composed of four Schottky diodes 41 can also be used for one-way filtering. The circuit with one-way filtering function should belong to the description of this article. The one-way filter device of the Schottky diode 41, which is not limited herein, can be a Schottky diode 41, and can also be a plurality of Schottky diodes 41. After the one-way filtering of the Schottky diode 41 is completed, the raised voltage or step-down guide voltage, but the voltage value of the guide voltage may not reach the 12V required by the charging pile, so after the Schottky diode 41, a voltage divider circuit 624 is also provided to detect And the voltage value of the pilot voltage is adjusted in a closed loop.

As an embodiment herein, the voltage divider circuit 624 includes a fourth resistor 14 and a sixth resistor 16;

One end of the fourth resistor 14 is connected to the cathode of the Schottky diode 41, the other end of the fourth resistor 14 is connected to one end of the sixth resistor 16, and the other end of the sixth resistor 16 is grounded;

The connection between the fourth resistor 14 and the sixth resistor 16 is connected to the feedback pin 3 of the voltage stabilizing module 61;

The voltage dividing circuit is also connected in parallel with a seventh capacitor 27, one end of the seventh capacitor 27 is connected to the cathode of the Schottky diode 41, and the other end is grounded.

It should be noted that, according to the circuit design in this paper, there is the following formula V _out = 1.26 (1+R ₄ /R ₆ ), where 1.26 is the feedback coefficient, when the feedback pin 3 receives the fourth resistor 14 and the sixth resistor 16 When the voltage is in the middle, every clock, the voltage will increase or decrease according to the above formula until it reaches 12V, but the multiple of 1.26 in the formula is the characteristic of the internal structure of the voltage stabilizing module 61 in this paper, and this paper will not repeat it here. The fourth resistor 14 is 41.2kΩ, and the sixth resistor 16 is 4.7kΩ.

As an embodiment of this paper, the boost mode is that the pulse voltage is stored and filtered by the first capacitor 21, the first inductor 31 cancels out, and the Schottky diode 41 conducts in one direction;

It should be noted that, in this paper, the boost circuit BOOST scheme commonly used in direct current is adopted. When the field effect transistor 51 is turned off, the right side of the field effect transistor 51 is equivalent to the load. When the current passes through the first inductor 31, the first inductor 31 will decrease, in order to resist the reduction of current, the inductance will induce an induced voltage, and the magnitude of the induced voltage is

Where L is the inductance of the first inductor, i is the magnitude of the changing current within the changing time t, the direction of the induced voltage is consistent with the voltage of the vehicle battery power supply, so the two are coupled, so that the coupled voltage may be close to the conduction voltage. At this time, the first capacitor 21 supplies power to the load, and then when the field effect transistor 51 is turned off, the first capacitor 21 is no longer charged, and the current induced voltage direction of the first inductor 31 is opposite to the voltage direction of the vehicle battery power supply , and under the cut-off effect of the Schottky diode 41, the first capacitor 21 can only supply power to the load, so the output voltage can be close to the pilot voltage, and under the extremely fast turn-on and cut-off effect of the FET 51, the load can be effectively the pilot voltage.

As an embodiment of this paper, the step-down mode is that the pulse voltage is stored and filtered by the first capacitor 21, the second inductor 32 cancels out, and the Schottky diode 41 conducts in one direction;

It should be noted that, in this paper, a common step-down circuit BUCK scheme for direct current is adopted, wherein the duty ratio of the pulse voltage is controlled according to the effective voltage at which the Schottky diode 41 is turned on.

When the field effect transistor 51 is turned on, the vehicle battery power stores energy for the second inductance 32 and the first capacitor 21, but due to the non-mutability of the inductance, the second inductance 32 generates an induced voltage opposite to the voltage direction of the vehicle battery power supply, so that The load on the right side of the second inductance 32 cannot reach the input voltage of the vehicle battery power supply. The specific voltage is V _out = the voltage of the vehicle power supply - U _L . When the field effect tube 51 is cut off, the second inductance 32 is equivalent to the power supply. The second inductor 32 supplies power to the load and forms a loop through the Schottky diode 41, so the output voltage at both ends of the load can be close to the pilot voltage, and the load can obtain a stable pilot voltage under the continuous conduction of the field effect transistor 51.

As an embodiment herein, an anti-radiation circuit 627 is also provided between the pulse switch circuit and the coupling rectifier circuit 623;

The anti-radiation circuit 627 includes a second resistor 12 and a fifth capacitor 25;

One end of the second resistor 12 is disposed between the drain of the field effect transistor 51 and the first capacitor 21 , the other end is connected to one end of the fifth capacitor 25 , and the other end of the fifth capacitor 25 is grounded.

It should be noted that the anti-radiation circuit 627 is designed to prevent the magnetic field caused by the continuous pulse voltage from possibly affecting the internal components of the new energy vehicle, so the anti-radiation circuit 627 is added to reduce the electromagnetic interference of the circuit itself to the outside world , in essence, the anti-radiation circuit 627 is to use the characteristics of inductance and capacitance, so that the alternating current with a frequency of about 50 Hz can pass through, but the alternating current higher than 50 Hz is filtered out, so the anti-radiation circuit 627 in this article can use low It is replaced by a pass filter, which means that the low frequency is passed and the high frequency is eliminated, so as to avoid the influence of high frequency on the outside. The second resistor 12 is 3Ω, and the fifth capacitor 25 is 2000pF.

As an embodiment herein, the voltage dividing circuit 624 is further connected in parallel with a seventh capacitor 27 , one end of the seventh capacitor 27 is connected to the cathode of the Schottky diode 41 , and the other end is grounded.

It should be noted that the seventh capacitor 27 can be used as a filter device for the pilot voltage to obtain a more stable pilot voltage, and the seventh capacitor 27 is 10 μF.

As an embodiment herein, the soft start circuit 625 includes a third resistor 13, a sixth capacitor 26 and a fourth capacitor 24;

One end of the third resistor 13 is connected to the compensation pin 2, the other end is connected to one end of the sixth capacitor 26, and the other end of the sixth capacitor 26 is grounded;

One end of the fourth capacitor 24 is connected to the compensation pin 2 and the other end is grounded.

It should be noted that the basic structure of the soft start circuit 625 is the third resistor 13 and the sixth capacitor 26, and in order to make the voltage stabilizing module 61 soft start more stably, a fourth capacitor 24 is added, which is compatible with the third resistor 13 and the sixth capacitor 26. The series loop composed of six capacitors 26 is connected in parallel. In this field, the soft start circuit 625 is generally built by using resistors in series with capacitors. Therefore, this paper does not limit the soft start circuit 625. Any circuit that can protect the voltage regulator chip and suppress surges The surge current circuit should belong to the protection scope of this paper, wherein the third resistor 13 is 619Ω, and the sixth capacitor 26 is 033μF.

As an embodiment herein, the analog ground pin 4 is used for connecting the analog ground, and the power ground pin 5 is used for connecting the ground wire of the vehicle battery power supply.

It should be noted that the voltage stabilizing module 61 herein has at least two ground pins, the power ground pin 5 is connected to the negative pole of the storage battery/battery, and the analog ground pin 4 is connected to the ground.

The embodiment of this paper also provides a new energy vehicle charging socket, as shown in Figure 6, a schematic diagram of the connection relationship between a new energy vehicle charging socket and a charging pile, a new energy vehicle charging socket 71, a loadable vehicle battery power supply voltage regulator circuit, When the new energy vehicle charging socket 71 is docked with the charging pile 72, the pilot voltage can be identified according to the fast charging pile 72, and a fast charging identification process can be realized.

In this paper, specific examples have been used to illustrate the principles and implementation methods of this paper. The description of the above embodiments is only used to help understand the method and core ideas of this paper; meanwhile, for those of ordinary skill in the art, according to the ideas of this paper , there will be changes in specific implementation methods and application scopes. In summary, the content of this specification should not be construed as a limitation on this document.

Claims

A voltage stabilizing circuit for a vehicle battery power supply, characterized in that it comprises:

The voltage stabilizing module is used to receive the vehicle battery power and has several pins;

A filtering circuit, connected to the input pin of the voltage stabilizing module, is used to filter noise fluctuations of the vehicle battery power supply to obtain a DC voltage;

A pulse switch circuit, configured to receive the conduction signal of the driving pin of the voltage stabilizing module to generate a pulse voltage;

A coupled rectifier circuit, connected to the pulse switch circuit, for coupling the pulse voltage with the DC voltage and rectifying it into a pilot voltage;

The voltage-dividing sampling circuit is used to divide the pilot voltage and feed it back to the feedback pin of the voltage stabilizing module, and the voltage stabilizing module is configured to output a variable duty ratio signal according to the voltage-dividing result, so that the The voltage stabilizing circuit is in a boost mode or a buck mode to adjust the pilot voltage until a predetermined pilot requirement is met.
The vehicle battery power supply voltage stabilizing circuit according to claim 1, further comprising:

A soft start circuit, connected to the compensation pin of the voltage stabilizing module, is used to suppress the surge current when the voltage stabilizing module receives the vehicle battery power;

The enabling circuit is connected to the clock pin of the voltage stabilizing module and is used to control the working frequency of the voltage stabilizing module.
The vehicle battery power supply voltage stabilizing circuit according to claim 2, wherein the filter circuit is connected to the input pin, and the filter circuit includes a second capacitor, a third capacitor and a first inductor;

One end of the second capacitor and the third capacitor are connected in parallel, both are connected to the vehicle battery power supply, and the other end is grounded;

One end of the second capacitor connected to the third capacitor is connected to one end of the first inductor, and the other end of the first inductor is connected to the pulse switch circuit.
The vehicle battery power supply voltage stabilizing circuit according to claim 3, wherein the pulse switch circuit comprises a field effect transistor and a seventh resistor;

The drain of the field effect transistor is connected to the first inductor, the gate of the field effect transistor is connected to the driving pin, the source of the field effect transistor is connected to one end of the seventh resistor, The other end of the seventh resistor is grounded.
The vehicle battery power supply voltage stabilizing circuit according to claim 4, wherein a fifth resistor is arranged between the source of the field effect transistor and the current detection pin of the voltage stabilizing module, and the fifth resistor The end far away from the field effect transistor is connected to one end of the eighth capacitor, and the other end of the eighth capacitor is grounded;

The current detection pin is used to detect the working current of the field effect transistor.
The vehicle battery power supply voltage stabilizing circuit according to claim 4, wherein the coupling rectification circuit comprises a first capacitor, a second inductor and a Schottky diode;

One end of the first capacitor is connected to the drain of the field effect transistor, the other end is connected to one end of the second inductor, and the other end of the second inductor is grounded;

The connection position of the first capacitor and the second inductor is connected to the anode of the Schottky diode, and the cathode of the Schottky diode is connected to the voltage divider circuit.
The vehicle battery power supply voltage stabilizing circuit according to claim 6, wherein the voltage dividing circuit comprises a fourth resistor and a sixth resistor;

One end of the fourth resistor is connected to the cathode of the Schottky diode, the other end of the fourth resistor is connected to one end of the sixth resistor, and the other end of the sixth resistor is grounded;

The connection between the fourth resistor and the sixth resistor is connected to the feedback pin of the voltage stabilizing module.
The vehicle battery power supply voltage stabilizing circuit according to claim 6, wherein an anti-radiation circuit is also provided between the pulse switch circuit and the coupling rectifier circuit;

The anti-radiation circuit includes a second resistor and a fifth capacitor;

One end of the second resistor is disposed between the drain of the field effect transistor and the first capacitor, the other end is connected to one end of the fifth capacitor, and the other end of the fifth capacitor is grounded.
The vehicle battery power supply voltage stabilizing circuit according to claim 7, wherein the voltage divider circuit is also connected in parallel with a seventh capacitor, one end of the seventh capacitor is connected to the cathode of the Schottky diode, and the other end is grounded.
The vehicle battery power supply voltage stabilizing circuit according to claim 2, wherein the soft start circuit comprises a third resistor, a sixth capacitor and a fourth capacitor;

One end of the third resistor is connected to the compensation pin, the other end is connected to one end of the sixth capacitor, and the other end of the sixth capacitor is grounded;

One end of the fourth capacitor is connected to the compensation pin, and the other end is grounded.
The vehicle battery power supply voltage stabilizing circuit according to claim 2, wherein the enabling circuit comprises a first resistor;

One end of the first resistor is connected to the clock pin, and the other end receives the enabling signal.
The vehicle battery power supply voltage stabilizing circuit according to claim 1, characterized in that,

The voltage stabilizing module is also provided with an analog ground pin and a power ground pin.
The vehicle battery power supply voltage stabilizing circuit according to claim 12, characterized in that,

The analog ground pin is used to connect to analog ground.
The vehicle battery power supply voltage stabilizing circuit according to claim 12, characterized in that,

The power supply ground pin is used to connect the ground wire of the vehicle battery power supply.
The vehicle battery power supply voltage stabilizing circuit according to claim 6, wherein the pilot voltage is 12V DC voltage.
The vehicle battery power supply voltage stabilization circuit according to claim 15, characterized in that, in the boost mode, the pulse voltage is stored and filtered by the first capacitor, the first inductance is offset, and the Schottky diode one-way conduction;

Wherein, the duty cycle of the pulse voltage is controlled according to the effective voltage at which the Schottky diode is turned on.
According to the vehicle battery power supply voltage stabilizing circuit according to claim 15, it is characterized in that, in the step-down mode, the pulse voltage is stored and filtered by the first capacitor, the second inductance is offset, and the Schottky diode one-way conduction;

Wherein, the duty cycle of the pulse voltage is controlled according to the effective voltage at which the Schottky diode is turned on.
A new energy vehicle charging socket is characterized in that,

receiving charging points; and

Arrange the on-vehicle battery power supply voltage stabilization circuit according to any one of claims 1-17, and provide a pilot voltage when receiving a charging pile.