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

Abstract

The application provides a vehicle-mounted battery power supply voltage stabilizing circuit and a new energy vehicle charging socket, comprising: a voltage stabilizing module with a plurality of pins; a peripheral module comprising: a filter circuit connected with input pins of the voltage stabilizing module, used for receiving a vehicle-mounted battery power supply, filtering noise fluctuation of the vehicle-mounted battery power supply, and obtaining a direct current voltage; a pulse switch circuit used for receiving a driving pin signal of the voltage stabilizing module, and generating a pulse voltage; a coupling rectifier circuit connected with the pulse switch circuit, used for coupling and rectifying the pulse voltage and the direct current voltage into a guide voltage; and a voltage dividing circuit used for feeding back the guide voltage to a feedback pin of the voltage stabilizing module after voltage division, so that the voltage stabilizing module controls a duty cycle of the pulse voltage according to the voltage division result, until the guide voltage meets a guide requirement, and the driving pin adjusts the on-off of a field effect transistor through a feedback signal to adjust the duty cycle of the pulse voltage, so that a stable guide voltage is obtained after coupling and rectifying the pulse voltage and the vehicle-mounted battery power supply.

Description

TECHNICAL FIELD

[0001] The present application 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-mounted battery power supply voltage stabilization circuit and a new energy vehicle charging socket. BACKGROUND

[0002] When charging a new energy vehicle, the new energy vehicle needs to input a guide voltage to a charging pile, and the charging pile inputs power to the new energy vehicle after identifying the charging guide voltage.

[0003] The guide voltage of the new energy vehicle is generally provided by a vehicle-mounted battery power supply. When the vehicle-mounted battery power supply fluctuates due to the start and stop of other vehicle-mounted devices, the vehicle-mounted battery power supply is likely to fail to provide stable power to the guide voltage, resulting in fluctuations in the guide voltage and the charging pile failing to identify the guide voltage. SUMMARY

[0004] In view of the above problems of the prior art, the purpose of the present application is to provide a vehicle-mounted battery power supply voltage stabilization circuit and a new energy vehicle charging socket to solve the problem that the vehicle-mounted battery cannot provide stable voltage, resulting in the charging guide voltage being unable to be identified and the new energy vehicle being unable to be charged.

[0005] To solve the above technical problems, the specific technical solutions of the present application are as follows:

[0006] On the one hand, the present application provides a vehicle-mounted battery power supply voltage stabilization circuit, comprising:

[0007] a voltage stabilization module for receiving a vehicle-mounted battery power supply and having a plurality of pins;

[0008] a filter circuit connected to the input pins of the voltage stabilization chip for filtering noise fluctuations of the vehicle-mounted battery power supply to obtain a direct current voltage;

[0009] a pulse switch circuit for receiving a driving signal of the driving pins of the voltage stabilization module to generate a pulse voltage;

[0010] a coupling rectifier circuit connected to the pulse switch circuit for coupling and rectifying the pulse voltage and the direct current voltage into a guide voltage;

[0011] a voltage dividing circuit for feeding back the guide voltage after voltage division to the feedback pins of the voltage stabilization module, the voltage stabilization module being configured to output a variable duty cycle signal according to the voltage division result, so that the voltage stabilization circuit is in a boost mode or a buck mode to adjust the guide voltage until the predetermined guide requirement is met.

[0012] As an embodiment of the present application, it further comprises:

[0013] The soft start circuit is connected with a compensation pin of the voltage stabilizing module, and is used for inhibiting inrush current when the voltage stabilizing module receives the vehicle battery power supply.

[0014] The enable circuit is connected with an enable pin of the voltage stabilizing module, and is used for controlling the working frequency of the voltage stabilizing module.

[0015] As an embodiment of the present application, the filter circuit is connected with the input pin, and the filter circuit comprises a second capacitor, a third capacitor and a first inductor;

[0016] The second capacitor and the third capacitor are connected in parallel, and are connected with the vehicle battery power supply, and the other ends are grounded.

[0017] One end of the second capacitor and the third capacitor connected with each other is connected with one end of the first inductor, and the other end of the first inductor is connected with the pulse switch circuit.

[0018] As an embodiment of the present application, the pulse switch circuit comprises a field effect transistor and a seventh resistor;

[0019] The drain of the field effect transistor is connected with the first inductor, the gate of the field effect transistor is connected with the driving pin, the source of the field effect transistor is connected with one end of the seventh resistor, and the other end of the seventh resistor is grounded.

[0020] As an embodiment of the present application, the fifth resistor is connected with one end of the eighth capacitor away from the field effect transistor, and the other end of the eighth capacitor is grounded;

[0021] The current detection pin is used for detecting the working current of the field effect transistor.

[0022] As an embodiment of the present application, the coupling rectifier circuit comprises a first capacitor, a second inductor and a Schottky diode;

[0023] One end of the first capacitor is connected with the drain of the field effect transistor, and the other end is connected with one end of the second inductor, and the other end of the second inductor is grounded.

[0024] The first capacitor is connected with the anode of the Schottky diode at the connection position, and the cathode of the Schottky diode is connected with the voltage dividing circuit.

[0025] As an embodiment of the present application, the voltage dividing circuit comprises a fourth resistor and a sixth resistor;

[0026] One end of the fourth resistor is connected with the cathode of the Schottky diode, the other end of the fourth resistor is connected with one end of the sixth resistor, and the other end of the sixth resistor is grounded.

[0027] The fourth resistor and the sixth resistor are connected with the feedback pin of the voltage stabilizing module at the connection position.

[0028] As an embodiment herein, the anti-radiation circuit is further arranged between the pulse switch circuit and the coupling rectifier circuit.

[0029] The anti-radiation circuit comprises a second resistor and a fifth capacitor.

[0030] One end of the second resistor is arranged between the drain of the field effect transistor and the first capacitor, and the other end is connected to one end of the fifth capacitor, and the other end of the fifth capacitor is grounded.

[0031] 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.

[0032] As an embodiment herein, the soft start circuit comprises a third resistor, a sixth capacitor and a fourth capacitor.

[0033] One end of the third resistor is connected to the compensation pin, and the other end is connected to one end of the sixth capacitor, and the other end of the sixth capacitor is grounded.

[0034] One end of the fourth capacitor is connected to the compensation pin, and the other end is grounded.

[0035] As an embodiment herein, the enable circuit comprises a first resistor.

[0036] One end of the first resistor is connected to the enable pin, and the other end receives the enable signal.

[0037] As an embodiment herein, the voltage stabilizing module further comprises an analog ground pin and a power ground pin.

[0038] As an embodiment herein, the analog ground pin is used to connect the analog ground.

[0039] As an embodiment herein, the power ground pin is used to connect the ground wire of the charging battery power supply.

[0040] As an embodiment herein, the guide voltage is a 12V direct current voltage.

[0041] As an embodiment herein, the boost mode is that the pulse voltage is stored and filtered by the first capacitor, offset by the first inductor, and unidirectionally conducted by the Schottky diode.

[0042] The duty cycle of the pulse voltage is controlled according to the effective voltage of the conduction of the Schottky diode.

[0043] As an embodiment herein, the boost mode is that the pulse voltage is stored and filtered by the first capacitor, offset by the first inductor, and unidirectionally conducted by the Schottky diode.

[0044] The duty cycle of the pulse voltage is controlled according to the effective voltage of the conduction of the Schottky diode.

[0045] In another aspect, the present application provides a new energy vehicle charging socket,

[0046] receiving a charging pile; and

[0047] The vehicle-mounted battery power supply voltage stabilizing circuit of any one of the arrangements is arranged to provide a guide voltage when receiving the charging pile.

[0048] With the above technical solution, the feedback signal received by the feedback pin of the voltage stabilizing module adjusts the on-off of the field effect tube by the driving pin, and then adjusts the pulse voltage duty cycle. After the pulse voltage and the vehicle-mounted battery power supply are coupled and rectified, a stable guide voltage is obtained, which can meet the requirements of the charging pile of the new energy vehicle for the guide voltage.

[0049] In order to make the above and other objects, features and advantages of the present application more apparent, the following will describe a preferred embodiment in detail, and the accompanying drawings will be described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0051] Figure 1 A system topology diagram of a vehicle-mounted battery power supply voltage stabilizing circuit according to an embodiment of the present application is shown;

[0052] Figure 2 A schematic diagram of a voltage stabilizing module of a vehicle-mounted battery power supply voltage stabilizing circuit according to an embodiment of the present application is shown;

[0053] Figure 3 A schematic diagram of a peripheral module of a vehicle-mounted battery power supply voltage stabilizing circuit according to an embodiment of the present application is shown;

[0054] Figure 4 A circuit schematic diagram of a vehicle-mounted battery power supply voltage stabilizing circuit according to an embodiment of the present application is shown;

[0055] Figure 5 A circuit schematic diagram of a vehicle-mounted battery power supply voltage stabilizing circuit according to an embodiment of the present application is shown;

[0056] Figure 6 A connection relationship schematic diagram of a new energy vehicle charging socket and a charging pile according to an embodiment of the present application is shown.

[0057] LIST OF ELEMENTS IN THE DRAWINGS

[0058] 1, current detection pin;

[0059] 2, compensation pin;

[0060] 3. Feedback pin;

[0061] 4. Analog ground pin;

[0062] 5. Power ground pin;

[0063] 6. Drive pin;

[0064] 7. Enable pin;

[0065] 8. Input pins;

[0066] 11. First resistor;

[0067] 12. Second resistor;

[0068] 13. The third resistor;

[0069] 14. The fourth resistor;

[0070] 15. Fifth resistor;

[0071] 16. Sixth resistor;

[0072] 17. Seventh resistor;

[0073] 21. First capacitor;

[0074] 22. Second capacitor;

[0075] 23. The third capacitor;

[0076] 24. Fourth capacitor;

[0077] 25. Fifth capacitor;

[0078] 26. Sixth capacitor;

[0079] 27. Seventh capacitor;

[0080] 28. Eighth capacitor;

[0081] 31. First inductor;

[0082] 32. Second inductor;

[0083] 41. Schottky diode;

[0084] 51. Field effect transistor;

[0085] 61. Voltage stabilizing module;

[0086] 621, filter circuit;

[0087] 622, pulse switching circuit;

[0088] 623, coupled rectifier circuit;

[0089] 624, voltage division circuit;

[0090] 625, soft start circuit;

[0091] 626, enable circuit;

[0092] 627, anti-radiation circuit;

[0093] 71, new energy automobile charging socket;

[0094] 72, charging pile. DETAILED DESCRIPTION

[0095] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0096] 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 problem that the charging pile cannot recognize the 12V pilot voltage of the specified new energy vehicle charging interface when the new energy vehicle is charging, which is caused by the increase of the load of the vehicle-mounted battery power supply of the new energy vehicle in the start-stop process or the start-stop process of various software, thereby affecting the power supply condition of the pilot voltage of the charging battery power supply.

[0097] Therefore, the present application provides a voltage stabilizing circuit, which realizes stable pilot voltage through the closed loop cooperation of the voltage stabilizing module 61 and the peripheral module, ensures that the charging pile can stably identify the charging pilot, and greatly improves the charging efficiency.

[0098] The embodiments of the present application provide a system topology diagram of a vehicle-mounted battery power supply voltage stabilizing circuit as shown in Figure 1 which specifically comprises:

[0099] The voltage stabilizing module 61 has a plurality of pins.

[0100] The peripheral module comprises:

[0101] The filter circuit 621 is connected with the input pin 8 of the voltage stabilizing module 61, is used for receiving the vehicle-mounted battery power supply, and filters the noise fluctuation of the vehicle-mounted battery power supply to obtain a direct current voltage.

[0102] The pulse switch circuit 622 is used for receiving the driving signal of the driving pin 6 of the voltage stabilizing module 61, and generating a pulse voltage.

[0103] The coupling rectifier circuit 623 is connected with the pulse switch circuit 622, and is used for coupling and rectifying the pulse voltage and the direct current voltage into the guide voltage;

[0104] The voltage dividing circuit 624 is used for feeding back the divided guide voltage to the feedback pin 3 of the voltage stabilizing module 61. The voltage stabilizing module 61 is configured to output a variable duty cycle signal according to the voltage dividing result, so as to make the voltage stabilizing circuit in the boost mode or the buck mode, so as to adjust the guide voltage until the predetermined guide requirement is met.

[0105] It should be noted that, as Figure 2 shown in a schematic diagram of a voltage stabilizing module of a vehicle battery power supply stabilizing circuit, the voltage stabilizing module 61 in the present application is an eight-pin chip. The voltage stabilizing module 61 in the present application can be a chip of model LL3488 of Texas Instruments. The working voltage of the chip is 3V-40V. The eight pins of the voltage stabilizing module 61 are respectively a current detection pin 1, a compensation pin 2, a feedback pin 3, an analog ground pin 4, a power ground pin 5, a drive pin 6, an enable pin 7 and an input pin 8 in the order of counterclockwise rotation from the top left.

[0106] The vehicle battery power supply in the present application can come from the voltage after the voltage of the automobile power battery is reduced, or come from a small battery / cell of the automobile except the automobile power battery. The small battery / cell can be a device for supplying power to an additional device of a new energy automobile, such as an audio, a navigator, an air conditioner or a lamp. When the additional device is started and stopped, there is a probability to affect the output voltage of the small battery / cell, so as to make the guide voltage unstable.

[0107] The vehicle battery power supply in the present application can have a noise or a harmonic wave and the like. Therefore, when the vehicle battery power supply is stabilized, the vehicle battery power supply needs to be filtered. After the filtering, a relatively stable direct current voltage is obtained, so as to be coupled and processed.

[0108] In the coupling process in this paper, the technical means of superimposing pulse voltage on the vehicle battery power is used, that is, the direct current voltage obtained by the filter circuit 621 and the pulse voltage obtained by the pulse switch circuit are coupled and rectified to obtain the guide voltage. However, the current guide voltage after the first pulse voltage coupling may not meet the 12V guide voltage required by the charging pile, so after being divided by the voltage dividing circuit 624, it is fed back to the feedback pin 3. In the internal voltage stabilizing module 61, the feedback pin 3 and the drive pin 6 have a corresponding relationship, that is, increasing or reducing the voltage received by the feedback signal, the voltage output by the drive pin 6 will have a corresponding change in frequency. Through the change of frequency, the duty cycle of the pulse voltage can be affected. In this way, under each clock, the guide voltage will be continuously adjusted until the 12V guide voltage required by the charging pile is obtained. In this paper, the frequency of the clock is controlled by the enable pin 7, and the order of magnitude of the clock is very small. The clock affects the generation speed of the pulse voltage. The charging pile can obtain the 12V charging guide voltage in a very short time.

[0109] As an embodiment of this paper, as shown in Figure 3 A schematic diagram of a peripheral circuit of a vehicle battery power supply voltage stabilizing circuit is also provided.

[0110] The soft start circuit 625 is connected with the compensation pin 2 of the voltage stabilizing module 61, and is used for inhibiting the inrush current when the voltage stabilizing module 61 receives the vehicle battery power supply. It is to be noted that the inrush current refers to the current characteristic of the electrical equipment in the instant of turning on, and has a great influence on various filter devices or rectifier devices, so the soft start circuit 625 needs to be added on the high-power electrical equipment. Therefore, in the inside of the voltage stabilizing module 61, there is a situation that the input pin 8 and the compensation pin 2 are turned on, and the means of adding a large resistance and a large capacitor to the compensation pin 2 is used to eliminate the sudden voltage with a large peak value when the input pin 8 receives the turn-on. The large resistance can increase the input impedance and remove the load to reduce the starting current. Therefore, the soft start circuit 625 has the following establishment principle, that is, removing the load in the power-on instant and limiting the useful current. 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 inrush current is eliminated, the load is changed from the soft start circuit 625 to the peripheral circuit. The switch source circuit corresponding to the input pin 8 in the inside of the voltage stabilizing module 61 and the soft start circuit 625 are independent of each other, and can be regarded as the peripheral circuit. In addition, the soft start circuit 625 can be designed according to actual needs, such as a power thermistor circuit, a rectifier tube-resistor type circuit, a rectifier tube-resistor type circuit with power-off detection, a relay-resistor type circuit or a relay-current limiting resistor circuit using a timing trigger. Therefore, in order to simplify the cost and improve the adaptability of the circuit, the most basic capacitor-resistor type soft start circuit 625 is adopted in the present application. However, the person skilled in the art can conceive the above-mentioned several kinds of soft start circuits 625 according to needs. The type of the soft start circuit 625 is not limited in the present application. Any circuit that can perform soft start should belong to the scope to be protected in the present application.

[0111] The enable circuit 626 is connected with the enable pin 7 of the voltage stabilizing module 61, and is used for controlling the working frequency of the voltage stabilizing module 61. It is to be noted that the voltage stabilizing module 61 in the present application needs to be enabled by the low level of the pull-down resistance, and the voltage value of the low level input to the voltage stabilizing module 61 can affect the working state of the voltage stabilizing module 61 in the present application. However, the specific influence mode is determined by the internal structure of the voltage stabilizing module 61, so it will not be described here.

[0112] The enable circuit 626 can be a bridge circuit connected with an external single-chip microcomputer or MCU. By changing the impedance of the enable circuit 626, the working frequency of the voltage stabilizing module 61 can be changed, and then the clock frequency of the pulse voltage is affected.

[0113] It is to be noted that the vehicle battery power supply stabilizing circuit can be constructed according to the above-mentioned various circuits, such as Figure 4The circuit principle diagram of the vehicle battery power supply voltage stabilizing circuit is shown, wherein the compensation pin 2 of the voltage stabilizing module 61 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 with the compensation pin 2, the other end of the third resistor 13 is connected with one end of the sixth capacitor 26, and the other end of the sixth capacitor 26 is grounded.

[0114] The enable pin 7 of the voltage stabilizing module 61 is connected with one end of the first resistor 11 of the pull-up resistor, and the other end of the first resistor 11 is connected with a control end, such as a single-chip microcomputer or MCU.

[0115] The analog ground pin 4 and the power supply ground pin 5 of the voltage stabilizing module 61 are respectively connected with an analog ground and a power supply ground.

[0116] The input pin 8 of the voltage stabilizing module 61 is connected with a vehicle battery power supply of a new energy vehicle or a vehicle battery power supply after voltage reduction, and the input pin 8 is also connected with a first inductor 31, which impedes the vehicle battery power supply, according to the Lenz law, to reduce the influence of the sudden voltage on the circuit, and the other end of the first inductor 31 is connected with the drain of a field effect transistor 51, the gate of the field effect transistor 51 is connected with the drive pin 6 of the voltage stabilizing module 61, the source of the field effect transistor 51 is connected with a seventh resistor 17, which plays a current detection role for the field effect transistor 51, the other end of the seventh resistor 17 is grounded, and the drain of the field effect transistor 51 is also connected with a coupling rectifier circuit 623, which includes a first capacitor 21, a second inductor 32 and a Schottky diode 41, one end of the first capacitor 21 is connected with the drain of the field effect transistor 51, the other end of the first capacitor 21 is connected with one end of the second inductor 32, the other end of the second inductor 32 is grounded, the junction of the second inductor 32 and the first capacitor 21 is connected with the anode of the Schottky diode 41, the Schottky diode 41 is connected with one end of a voltage dividing circuit 624, after coupling through the first capacitor 21 and the second inductor 32, half-wave rectification is performed through the Schottky diode 41, and an adjusted direct current voltage is obtained, but the voltage can not be 12V, so it is necessary to perform feedback through the voltage dividing circuit 624 and adjust again in the next clock cycle, the voltage dividing circuit 624 is formed by connecting a fourth resistor 14 and a sixth resistor 16 in series, the connection position of the fourth resistor 14 and the sixth resistor 16 is connected with the feedback pin 3 of the voltage stabilizing module, the feedback pin 3 can adjust the turn-on frequency of the drive pin 6 for the field effect transistor 51, and further adjust the duty cycle of the pulse voltage, so that the voltage value of the direct current voltage after rectification of the Schottky diode 41 can be adjusted again until the requirement of the guide voltage 12V is met.

[0117] On the other hand, the embodiments also provide a vehicle battery power supply voltage stabilizing circuit as shown in the accompanying drawings. Figure 5The circuit principle of the vehicle-mounted battery power supply voltage stabilizing circuit is shown, and the parameters of the electronic elements related to the voltage stabilizing module 61 and the optimal connection mode are given. In the circuit principle, the anti-radiation circuit 627 and the π-type filter circuit, and the current detection circuit are added, so that the use conditions of the voltage stabilizing module 61 under the working conditions are met, and the final mass production is realized.

[0118] The filter circuit 621 is connected to the input pin 8 of the voltage stabilizing module 61, and the filter circuit 621 includes a second capacitor 22, a third capacitor 23, and a first inductor 31.

[0119] The second capacitor 22 and the third capacitor 23 are connected in parallel at one end, and are connected to the vehicle-mounted battery power supply, and the other end is grounded.

[0120] The end connected to the second capacitor 22 and the third capacitor 23 of the voltage stabilizing module 61 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.

[0121] It should be noted that the filter circuit 621 in this paper is a π-type filter circuit, that is, an LC type, and the function of the filter circuit 621 is to remove unwanted harmonics. In a direct current power supply, it is to reduce the pulsation of the current, so that the current is smoother. The second capacitor 22 is 0.1F, the third capacitor 23 is 10μF, and the first inductor 31 is 47μH.

[0122] It should be noted that the skilled person in the art can adjust the filter circuit 621 to be an LC or RC circuit according to the input and output impedance, and the corresponding filtering effect can be obtained, so the filter circuit that can filter should be equivalent to replace the filter circuit 621 in this paper, so this paper does not limit the filter circuit 621.

[0123] As an embodiment of this paper, the pulse switch circuit 622 includes a field effect transistor 51 and a seventh resistor 17.

[0124] 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 driving pin 6, and the source of the field effect transistor 51 is connected to one end of the seventh resistor 17. The other end of the seventh resistor 17 is grounded.

[0125] It should be noted that 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 driving pin 6, so that the pulse voltage with different duty cycles can be output according to the signal sent by the driving pin 6.

[0126] As an embodiment of this paper, the fifth resistor 15 is connected between the source of the field effect transistor 51 and the current detection pin 1 of the voltage stabilizing module 61. One end of the eighth capacitor 28 connected to the fifth resistor 15 is connected to the other end of the eighth capacitor 28, and the other end is grounded.

[0127] The current detection pin 1 is used to detect the operating current of the field effect transistor 51.

[0128] It should be noted that the current detection pin 1 can accurately obtain the working current of the field effect tube 51, and then obtain the working voltage of the field effect tube 51 according to the resistance value of the fifth resistor 15. In this article, the resistance value of the fifth resistor 15 is 100Ω. For example, the current detection pin 1 obtains a detection current of 0.02A, then the current evaluation working voltage of the field effect tube 51 is 2V. Therefore, through the current detection pin 1, the maintenance personnel of the new energy vehicle can easily obtain the working status of the field effect tube 51, and it is convenient for maintenance.

[0129] As an embodiment of this invention, the coupling rectifier circuit 623 includes a first capacitor 21, a second inductor 32 and a Schottky diode 41;

[0130] One end of the first capacitor 21 is connected to the drain of the field effect transistor 51, and the other end is connected to one end of the second inductor 32, and the other end of the second inductor 32 is grounded;

[0131] The connection point between 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 divider circuit 624 .

[0132] It should be noted that the coupling rectifier circuit 623 in this article has a coupling rectifier function, but it is only the simplest coupling rectifier circuit 623. Those skilled in the art can adjust the device combination of the coupling rectifier circuit 623 and the model of the Schottky diode 41 according to the pricing of new energy vehicles. 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 it only needs to be coupled with the first capacitor 21 and the second inductor 32 to obtain a positive and negative alternating pulse voltage greater than the output of the field effect tube. After obtaining this pulse voltage, after passing through the unidirectional bridge type A unidirectional filtering device, in this article, a Schottky diode 41 is selected for unidirectional filtering. In this field, a bridge composed of four Schottky diodes 41 can also be selected for unidirectional filtering. The circuit with unidirectional filtering function should belong to the unidirectional filtering device to be described in this article. This article does not limit it here. It can be a Schottky diode 41 or multiple Schottky diodes 41. After the unidirectional filtering of the Schottky diode 41 is completed, the boosted or bucked pilot voltage has been obtained, but the voltage value of the pilot voltage may not have reached the 12V required by the charging pile, so after the Schottky diode 41, a voltage divider circuit 624 is also provided to detect and close-loop adjust the voltage value of the pilot voltage.

[0133] As an embodiment herein, the voltage dividing circuit 624 comprises a fourth resistor 14 and a sixth resistor 16;

[0134] One end of the fourth resistor 14 is connected to the cathode of the Schottky diode 41, and 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;

[0135] 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;

[0136] The voltage dividing circuit is also connected in parallel with a seventh capacitor 27, one end of which is connected to the cathode of the Schottky diode 41, and the other end of which is grounded.

[0137] It should be noted that, according to the circuit design herein, there is the following formula V out = 1.26 (1 + R4 / R6), where 1.26 is the feedback coefficient, when the feedback pin 3 receives the voltage between the fourth resistor 14 and the sixth resistor 16, the voltage will be increased or decreased according to the above formula every clock, until it reaches 12V, but the 1.26 multiple in the formula is the characteristic of the internal structure of the voltage stabilizing module 61 herein, which will not be described herein, wherein the fourth resistor 14 is 41.2kΩ, and the sixth resistor 16 is 4.7kΩ.

[0138] As an embodiment herein, the boost mode is a pulse voltage that stores energy and filters through the first capacitor 21, and the first inductor 31 offsets, and the Schottky diode 41 is unidirectionally conducted;

[0139] Among them, the duty cycle of the pulse voltage is controlled according to the effective voltage of the Schottky diode conduction.

[0140] It should be noted that, in this paper, the commonly used boost circuit BOOST scheme of direct current is adopted, when the field effect transistor 51 is closed, the right side of the field effect transistor 51 is equivalent to a load, when the current passes through the first inductor 31, the first inductor 31 will decrease, in order to resist the decrease of current, the inductor will induce an induced voltage, the size of the induced voltage is Where L is the inductance of the first inductor, i is the change of current size in the change time t, the induced voltage is in the same direction as the voltage of the vehicle battery power supply, so they are coupled, so the coupled voltage may be close to the guide voltage, at this time the first capacitor 21 supplies power to the load, then when the field effect transistor 51 is closed, the first capacitor 21 is no longer charged, and the direction of the induced voltage of the current first inductor 31 is opposite to that of the vehicle battery power supply, under the cut-off action of the Schottky diode 41, the first capacitor 21 can only supply power to the load, so the output voltage can also be close to the guide voltage, under the extremely fast conduction and cut-off action of the field effect transistor 51, the load can obtain the effective guide voltage.

[0141] As an embodiment herein, the buck mode is that the pulse voltage is stored and filtered by the first capacitor 21, the second inductor 32 is offset, and the one-way conduction of the Schottky diode 41;

[0142] It should be noted that in this paper, the commonly used buck circuit BUCK scheme of direct current is adopted, wherein the duty cycle of the pulse voltage is controlled according to the effective voltage of the conduction of the Schottky diode 41.

[0143] When the field effect tube 51 is turned on, the vehicle battery power supplies the second inductor 32 and the first capacitor 21 to store energy, but due to the non-mutability of the inductor, the second inductor 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 inductor 32 cannot reach the input voltage of the vehicle battery power supply, and the specific voltage is V out = voltage of the vehicle power supply - U L When the field effect tube 51 is turned off, the second inductor 32 is equivalent to a power supply, and the load is supplied by the second inductor 32, and a loop is formed through the Schottky diode 41, so that the output voltage between the load can also approach the guide voltage. Under the continuous conduction of the field effect tube 51, the load can obtain stable guide voltage.

[0144] As an embodiment herein, the pulse switching circuit and the coupling rectifier circuit 623 are also provided with an anti-radiation circuit 627;

[0145] The anti-radiation circuit 627 includes a second resistor 12 and a fifth capacitor 25;

[0146] One end of the second resistor 12 is arranged between the drain of the field effect tube 51 and the first capacitor 21, and the other end is connected with one end of the fifth capacitor 25, and the other end of the fifth capacitor 25 is grounded.

[0147] It should be noted that the design intention of the anti-radiation circuit 627 is to prevent the magnetic field caused by the continuous pulse voltage from affecting the internal devices 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 uses the characteristics of inductors and capacitors, so that alternating current with a frequency of about 50HZ can pass through, but alternating current with a frequency higher than 50HZ is filtered out. Therefore, the anti-radiation circuit 627 in this paper can be replaced by a low-pass filter, which means low frequency passing and high frequency rejecting, avoiding high frequency affecting the outside world. The second resistor 12 is 3Ω, and the fifth capacitor 25 is 2000pF.

[0148] As an embodiment herein, the voltage dividing circuit 624 is also connected in parallel with a seventh capacitor 27, one end of the seventh capacitor 27 is connected with the cathode of the Schottky diode 41, and the other end is grounded.

[0149] It should be noted that the seventh capacitor 27 can be used as a filter for the guide voltage to obtain a more stable guide voltage, and the seventh capacitor 27 is 10 μF.

[0150] As an embodiment of the present application, the soft start circuit 625 comprises a third resistor 13, a sixth capacitor 26 and a fourth capacitor 24.

[0151] 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, and the other end of the sixth capacitor 26 is grounded.

[0152] One end of the fourth capacitor 24 is connected to the compensation pin 2, and the other end is grounded.

[0153] 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 more stably soft start the voltage stabilizing module 61, the fourth capacitor 24 is added in parallel with the series circuit composed of the third resistor 13 and the sixth capacitor 26. In the field, a soft start circuit 625 is generally built in the form of a resistor in series with a capacitor, so the soft start circuit 625 is not limited in the present application, and any circuit that can protect the voltage stabilizing chip and suppress the inrush current should be within the scope of the present application. The third resistor 13 is 619 Ω, and the sixth capacitor 26 is 033 μF.

[0154] As an embodiment of the present application, the analog ground pin 4 is used to connect the analog ground, and the power ground pin 5 is used to connect the ground of the vehicle battery power supply.

[0155] It should be noted that the voltage stabilizing module 61 of the present application has at least two ground pins, the power ground pin 5 is connected to the negative electrode of the battery / battery, and the analog ground pin 4 is connected to the ground.

[0156] The embodiments of the present application also provide a new energy vehicle charging socket, as shown in Figure 6 A new energy vehicle charging socket and a charging pile connection relationship schematic diagram, a new energy vehicle charging socket 71, a loadable vehicle battery power supply voltage stabilizing circuit, when the new energy vehicle charging socket 71 is connected to the charging pile 72, the guide voltage can be recognized by the fast charging pile 72, and the fast charging recognition process is realized.

[0157] The principles and implementation methods of the present application are described in the specific embodiments, and the above embodiments are only used to help understand the method and its core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation and application range can be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. An on-vehicle battery power supply voltage stabilizing circuit characterized by comprising: The application relates to a voltage stabilizing module for receiving a vehicle battery power supply and comprising a plurality of pins. A soft start circuit is connected to a compensation pin of the voltage stabilizing module and used for inhibiting inrush current when the voltage stabilizing module receives the vehicle battery power supply. An enabling circuit is connected to an enabling pin of the voltage stabilizing module and used for controlling the working frequency of the voltage stabilizing module. A filter circuit is connected to an input pin of the voltage stabilizing module and used for filtering noise fluctuation of the vehicle battery power supply to obtain a direct current voltage. A pulse switch circuit is used for receiving a driving pin of the voltage stabilizing module and generating a pulse voltage. A coupling rectifier circuit is connected to the pulse switch circuit and used for coupling and rectifying the pulse voltage and the direct current voltage into a guide voltage. A voltage dividing circuit is used for feeding back the guide voltage to a feedback pin of the voltage stabilizing module after voltage division, the voltage stabilizing module is configured to output a variable duty cycle signal according to the voltage division result, and the voltage stabilizing circuit is in a boost mode or a buck mode to adjust the guide voltage until a predetermined guide requirement is met; wherein adjusting the guide voltage until the predetermined guide requirement is met comprises adjusting the on-off of the field effect tube in the pulse switch circuit through the feedback signal received by the feedback pin of the voltage stabilizing module, then adjusting the duty cycle of the pulse voltage, and finally obtaining a stable guide voltage after coupling and rectifying the pulse voltage and the vehicle battery power supply, wherein the feedback pin and the driving pin of the voltage stabilizing module have a corresponding relationship, that is, increasing or reducing the voltage received by the feedback signal can cause the voltage output by the driving pin to change in frequency, the change in frequency can affect the duty cycle of the pulse voltage, and thus the guide voltage is continuously adjusted at each clock until the required guide voltage of the charging pile is obtained. The filter circuit is connected to the input pin, and the filter circuit comprises a second capacitor, a third capacitor and a first inductor.

2. The vehicle-mounted battery power supply voltage stabilizing circuit according to claim 1, characterized by The second capacitor and the third capacitor are connected in parallel and connected to the vehicle battery power supply, and the other ends are grounded. One end of the second capacitor and the third capacitor connected to each other 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 pulse switch circuit comprises a field effect tube and a seventh resistor.

3. The vehicle-mounted battery power supply voltage stabilizing circuit according to claim 2, characterized by The drain of the field effect tube is connected to the first inductor, the gate of the field effect tube is connected to the driving pin, the source of the field effect tube is connected to one end of the seventh resistor, and the other end of the seventh resistor is grounded. A fifth resistor is arranged between the source of the field effect tube and a current detection pin of the voltage stabilizing module, one end of the fifth resistor connected to the field effect tube is connected to one end of an eighth capacitor, and the other end of the eighth capacitor is grounded.

4. The vehicle-mounted battery power supply voltage stabilizing circuit according to claim 3, wherein The current detection pin is used for detecting the working current of the field effect tube. The coupling rectifier circuit comprises a first capacitor, a second inductor and a Schottky diode.

5. The vehicle battery power supply regulator circuit according to claim 3, wherein One end of the first capacitor is connected to the drain of the field effect tube, and the other end is connected to one end of the second inductor, and the other end of the second inductor is grounded. The first capacitor and the second inductor are connected to the anode of the Schottky diode, and the cathode of the Schottky diode is connected to the voltage dividing circuit. ​ 6. The vehicle battery power supply regulator circuit according to claim 5, 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, and 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.

7. The vehicle battery power supply regulator circuit according to claim 5, wherein An anti-radiation circuit is further arranged between the pulse switch circuit and the coupling rectifier circuit; The anti-radiation circuit comprises a second resistor and a fifth capacitor; One end of the second resistor is arranged between the drain of the field effect tube and the first capacitor, and the other end is connected to one end of the fifth capacitor, and the other end of the fifth capacitor is grounded.

8. The vehicle battery power supply regulator circuit of claim 6, wherein, 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.

9. The vehicle battery power supply regulator circuit of claim 1, 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, and 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.

10. The vehicle battery power supply regulation circuit of claim 1, wherein, The enable circuit comprises a first resistor; One end of the first resistor is connected to the enable pin, and the other end receives an enable signal.

11. The vehicle battery power supply regulation circuit of claim 1, wherein, The voltage stabilizing module further comprises an analog ground pin and a power ground pin.

12. The vehicle battery power supply regulation circuit of claim 11, wherein, The analog ground pin is used to connect the analog ground.

13. The vehicle battery power supply regulation circuit of claim 11, wherein, The power ground pin is used to connect the ground wire of the vehicle-mounted battery power supply.

14. The vehicle battery power supply regulation circuit of claim 5, wherein, The guide voltage is a 12V direct current voltage.

15. The vehicle battery power supply regulation circuit of claim 14, wherein, In the boost mode, the pulse voltage is stored and filtered by the first capacitor, the first inductor is offset, and the Schottky diode is unidirectionally conducted. The duty cycle of the pulse voltage is controlled according to the effective voltage of the conduction of the Schottky diode.

16. The vehicle battery power supply regulation circuit of claim 14, wherein, In the boost mode, the pulse voltage is stored and filtered by the first capacitor, the first inductor is offset, and the Schottky diode is unidirectionally conducted. The duty cycle of the pulse voltage is controlled according to the effective voltage of the conduction of the Schottky diode.

17. A new energy vehicle charging socket, characterized in that, receiving a charging pile; and arranging the vehicle-mounted battery power supply voltage stabilizing circuit according to any one of claims 1-16, and providing a guide voltage when receiving a charging pile.

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