Circuit for wide power supply adaptive stable output of pure electric vehicle

Abstract

The utility model provides a circuit for wide power supply adaptive stable output of a pure electric vehicle. Comprising a main control chip, a thermistor RT connected with a fourth contact and an eighth contact of the main control chip, a capacitor CT and a fixed resistor R911 which are connected with the fourth contact and a fifth contact of the main control chip, and a first transformation circuit connected with a sixth contact of the main control chip, the second transformation circuit is connected with a third contact of the main control chip; the resistance circuit is connected with a second contact and a first contact of the main control chip; a ferrite magnetic core transformer T902, an MOS (Metal Oxide Semiconductor) tube Q901 and a ferrite magnetic core transformer T901 are connected in the first voltage transformation circuit; the second transformer circuit is connected with a diode D911, a diode D908 and a resistor R902; a resistor R913, a capacitor C913, a resistor R934, a resistor R904 and a variable resistor VR902 are connected in the resistance circuit, in the practical application process, the problem that a large-current load is seriously heated can be well solved through circuit design, and the safety degree of line operation is improved.

Description

[Technical field]

[0001] The utility model relates to the technical field of power output circuits, and in particular to a circuit with outstanding application effect and strong stability for adaptively and stably outputting wide power supplies for pure electric vehicles. [Background Technology]

[0002] Electric vehicles refer to transport vehicles that use electric energy as the motive force and are driven by traction motors. With the continuous development and progress of science and technology, the types of vehicles that use electric energy as a power source are gradually increasing. For example, common electric vehicles mainly include railway trunk electric vehicles, subway electric vehicles, urban trams, light rail electric vehicles, battery electric vehicles, etc. In the power supply circuit of the battery management system of electric vehicles, in order to prevent users from improper operation during use, such as reverse connection of the power supply, diodes are often used to prevent reverse connection to ensure the reliability of the battery management system. The power supply circuit of the traditional battery management system of electric vehicles uses a diode to prevent reverse connection of the power supply. During normal use, when it is necessary to drive the relay, due to the fixed voltage drop of the diode and the large current when driving the relay, the power consumption of the diode increases exponentially, and there is a serious problem of heating when the current load is large. The power supply circuit of the battery management system of traditional electric vehicles has the disadvantages of low reliability and poor adaptability.

[0003] For example, the invention patent with application number CN201810987116.7 and patent name "A Power Control Circuit for an Electric Vehicle Battery Management System" specifically discloses a power control circuit for an electric vehicle battery management system, including a power detection circuit, a control signal circuit, and two or more field effect transistor drive circuits. The input end of each field effect transistor drive circuit is used to connect different types of charging power supplies, the control end of each field effect transistor drive circuit is connected to the control signal circuit, and the output end of each field effect transistor drive circuit is connected to the power supply of the control circuit. The power detection circuit is used to connect the charging power supply and the external controller, and the control signal circuit is used to connect the external controller. The output voltage of the external power supply is detected by the power detection circuit, and the control signal circuit controls the field effect transistor drive circuit of the charging power supply with the highest output voltage to turn on, and the charging power supply with the highest output voltage is connected to the power supply of the control circuit. The low on-resistance of the field effect transistor when it is turned on can effectively reduce heat loss when a large current passes through it, thereby improving the reliability and stability of the system.

[0004] Although the above-mentioned prior art solutions have improved the safety and stability of power supply output to a certain extent, they still have some shortcomings and need to be further optimized. [Contents of the utility model]

[0005] The problems existing in the prior art solved by this application are:

[0006] The power supply circuit of the traditional electric vehicle battery management system uses a diode to prevent reverse connection of the power supply. During normal use, when it is necessary to drive the relay, the fixed voltage drop of the diode and the large current when driving the relay cause the power consumption of the diode to increase exponentially, resulting in serious heating problems when the current is large. The power supply circuit of the traditional electric vehicle battery management system has the disadvantages of low reliability and poor adaptability.

[0007] The solution to the technical problem of the utility model is:

[0008] Provided is a circuit for adaptively stabilizing the output of a wide power supply for a pure electric vehicle, comprising a main control chip, a thermistor RT connected to the No. 4 and No. 8 contacts of the main control chip, a capacitor CT and a fixed resistor R911 connected to the No. 4 and No. 5 contacts of the main control chip, a first voltage conversion circuit connected to the No. 6 contact of the main control chip, a second voltage conversion circuit connected to the No. 3 contact of the main control chip, and a resistor circuit connected to the No. 2 and No. 1 contacts of the main control chip; the first voltage conversion circuit is connected to A ferrite core transformer T902, a MOS tube Q901 and a ferrite core transformer T901; a diode D911, a diode D908 and a resistor R902 are connected to the second transformer circuit; a resistor R913, a capacitor C913, a resistor R934, a resistor R904 and a variable resistor VR902 are connected to the resistor circuit; the primary winding of the ferrite core transformer T901 is connected to the first transformer circuit; the secondary winding of the ferrite core transformer T901 is connected to the second transformer circuit. The primary winding of the ferrite core transformer T901 is also connected to a rectifier diode circuit; the rectifier diode circuit is connected with a rectifier diode D901, a capacitor C905, a negative temperature coefficient thermistor RT1, and a fuse FU; the resistor R913 is connected in parallel with the capacitor C913; the resistor R934, the resistor R904 and the variable resistor VR902 are connected in series; the diode D911 and the diode D908 are connected in series, and the output end of the diode D911 is connected to the diode The input end of the diode D908 is connected to the resistor R902 through a capacitor; it also includes a voltage-stabilizing diode circuit connected to contact No. 7 of the main control chip and the second transformer circuit; the voltage-stabilizing diode circuit is connected with a capacitor C909 and a voltage-stabilizing diode 1W; the input end of the capacitor C909 is connected to contact No. 7 of the main control chip; the output end of the voltage-stabilizing diode 1W is connected to the second transformer circuit; the drain of the MOS tube Q901 is connected to the ferrite core transformer T901.

[0009] Preferably, the model of the main control chip is MC3842.

[0010] Preferably, the source of the MOS transistor Q91 is connected to the common ground.

[0011] Preferably, a resistor R910 is further connected to the second transformer circuit; one end of the resistor R910 is connected to contact No. 3 of the main control chip, and the other end is connected to the resistor R902.

[0012] Preferably, the other end of the resistor R904 relative to the variable resistor VR902 is connected to a common ground.

[0013] The technical effects of solving the technical problem in this application are as follows:

[0014] Compared with the prior art, the utility model is a circuit for adaptively stabilizing the output of a wide power supply of a pure electric vehicle, by simultaneously setting a main control chip, a thermistor RT connected to the No. 4 contact and the No. 8 contact of the main control chip, a capacitor CT and a fixed resistor R911 connected to the No. 4 contact and the No. 5 contact of the main control chip, a first voltage conversion circuit connected to the No. 6 contact of the main control chip, a second voltage conversion circuit connected to the No. 3 contact of the main control chip, and a resistor circuit connected to the No. 2 contact and the No. 1 contact of the main control chip; the first voltage conversion circuit is connected to an iron The ferrite core transformer T902, MOS tube Q901 and ferrite core transformer T901 are connected; the second transformer circuit is connected with diode D911, diode D908 and resistor R902; the resistor circuit is connected with resistor R913, capacitor C913, resistor R934, resistor R904 and variable resistor VR902; the primary winding of the ferrite core transformer T901 is connected to the first transformer circuit; the secondary winding of the ferrite core transformer T901 is connected to the second transformer circuit; the ferrite core transformer T The primary winding of 901 is also connected to a rectifier diode circuit; the rectifier diode D901, capacitor C905, negative temperature coefficient thermistor RT1, and fuse FU are connected in the rectifier diode circuit; the resistor R913 is connected in parallel with the capacitor C913; the resistor R934, resistor R904 and variable resistor VR902 are connected in series; the diode D911 and diode D908 are connected in series, and the output end of the diode D911 and the input end of the diode D908 are connected to the resistor R908 through a capacitor. 2; it also includes a voltage-stabilizing diode circuit connected to contact No. 7 of the main control chip and the second transformer circuit; the voltage-stabilizing diode circuit is connected with a capacitor C909 and a voltage-stabilizing diode 1W; the input end of the capacitor C909 is connected to contact No. 7 of the main control chip; the output end of the voltage-stabilizing diode 1W is connected to the second transformer circuit; the drain of the MOS tube Q901 is connected to the ferrite core transformer T901. In actual application, the problem of severe heating of large current loads can be better alleviated through circuit design, thereby improving the safety of line operation. [Drawings]

[0015] Figure 1 The utility model is a circuit connection schematic diagram of a circuit for adaptively stabilizing output of a wide power supply of a pure electric vehicle. [Specific implementation method]

[0016] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit this utility model.

[0017] See also Figure 1 The utility model is a circuit 1 for adaptive stable output of wide power supply of pure electric vehicle, comprising a main control chip, a thermistor RT connected to the No. 4 contact and the No. 8 contact of the main control chip, a capacitor CT and a fixed resistor R911 connected to the No. 4 contact and the No. 5 contact of the main control chip, a first voltage conversion circuit connected to the No. 6 contact of the main control chip, a second voltage conversion circuit connected to the No. 3 contact of the main control chip, and a resistance circuit connected to the No. 2 contact and the No. 1 contact of the main control chip; in the first voltage conversion circuit, A ferrite core transformer T902, a MOS tube Q901 and a ferrite core transformer T901 are connected; a diode D911, a diode D908 and a resistor R902 are connected in the second transformer circuit; a resistor R913, a capacitor C913, a resistor R934, a resistor R904 and a variable resistor VR902 are connected in the resistor circuit; the primary winding of the ferrite core transformer T901 is connected to the first transformer circuit; the secondary winding of the ferrite core transformer T901 is connected to the second Transformer circuit; the primary winding of the ferrite core transformer T901 is also connected to a rectifier diode circuit; the rectifier diode circuit is connected with a rectifier diode D901, a capacitor C905, a negative temperature coefficient thermistor RT1, and a fuse FU; the resistor R913 is connected in parallel with the capacitor C913; the resistor R934, the resistor R904 and the variable resistor VR902 are connected in series; the diode D911 and the diode D908 are connected in series, and the output end of the diode D911 is connected to the The input end of the diode D908 is connected to the resistor R902 through a capacitor; it also includes a voltage-stabilizing diode circuit connected to contact No. 7 of the main control chip and the second transformer circuit; the voltage-stabilizing diode circuit is connected with a capacitor C909 and a voltage-stabilizing diode 1W; the input end of the capacitor C909 is connected to contact No. 7 of the main control chip; the output end of the voltage-stabilizing diode 1W is connected to the second transformer circuit; the drain of the MOS tube Q901 is connected to the ferrite core transformer T901.

[0018] This application mainly protects the circuit connection method of the power supply stable output circuit, and through specific circuit operation tests, it can achieve a better output effect;

[0019] The present application simultaneously sets a main control chip, a thermistor RT connected to the No. 4 and No. 8 contacts of the main control chip, a capacitor CT and a fixed resistor R911 connected to the No. 4 and No. 5 contacts of the main control chip, a first voltage conversion circuit connected to the No. 6 contact of the main control chip, a second voltage conversion circuit connected to the No. 3 contact of the main control chip, and a resistance circuit connected to the No. 2 and No. 1 contacts of the main control chip; the first voltage conversion circuit is connected to a ferrite core transformer T902, a MOS tube Q901, and an iron core transformer T903; the second voltage conversion circuit is connected to the No. 6 contact of the main control chip, and the second voltage conversion circuit is connected to the No. 3 contact of the main control chip; the second voltage conversion circuit is connected to the No. 2 and No. 1 contacts of the main control chip; the first voltage conversion circuit is connected to the No. 4 and No. 5 contacts of the main control chip, and ...4 and No. 5 contacts of the main control chip; the first voltage conversion circuit is connected to the No. 4 and No. 5 contacts of the main control chip, and the second voltage conversion circuit is connected to the No. 4 and No. 5 contacts of the main control chip; the first voltage conversion circuit is connected to the No. 4 and No. 5 contacts of the main control chip, and the second voltage conversion circuit is connected to the No. 4 and No. 5 contacts of the main control chip; the first voltage conversion circuit is connected to the No. 4 and No. 5 contacts of the main control chip, and the second voltage conversion circuit is connected to The ferrite core transformer T901 is connected to the first transformer circuit; the second transformer circuit is connected to a diode D911, a diode D908 and a resistor R902; the resistor circuit is connected to a resistor R913, a capacitor C913, a resistor R934, a resistor R904 and a variable resistor VR902; the primary winding of the ferrite core transformer T901 is connected to the first transformer circuit; the secondary winding of the ferrite core transformer T901 is connected to the second transformer circuit; the primary winding of the ferrite core transformer T901 is also connected to a rectifier diode The rectifier diode circuit is connected with a rectifier diode D901, a capacitor C905, a negative temperature coefficient thermistor RT1, and a fuse FU; the resistor R913 is connected in parallel with the capacitor C913; the resistor R934, the resistor R904 and the variable resistor VR902 are connected in series; the diode D911 and the diode D908 are connected in series, and the output end of the diode D911 and the input end of the diode D908 are connected to the resistor R902 through a capacitor; and the resistor R913 is connected in parallel with the capacitor C905; the resistor R913 is connected in parallel with the capacitor C905; the resistor R913 is connected in parallel with the capacitor C905; the resistor R913 is connected in series with the resistor R904; the resistor R934 ... A voltage-stabilizing diode circuit connected to contact No. 7 of the main control chip and the second transformer circuit; a capacitor C909 and a voltage-stabilizing diode 1W are connected to the voltage-stabilizing diode circuit; the input end of the capacitor C909 is connected to contact No. 7 of the main control chip; the output end of the voltage-stabilizing diode 1W is connected to the second transformer circuit; the drain of the MOS tube Q901 is connected to the ferrite core transformer T901. In actual application, the circuit design can better alleviate the problem of severe heating of large current loads and improve the safety of line operation.

[0020] In some other embodiments, the model of the main control chip is MC3842.

[0021] The source of the MOS transistor Q91 is connected to the common ground.

[0022] A resistor R910 is also connected to the second transformer circuit; one end of the resistor R910 is connected to contact No. 3 of the main control chip, and the other end is connected to the resistor R902.

[0023] The other end of the resistor R904 relative to the variable resistor VR902 is connected to the common ground.

[0024] The technical effects of solving the technical problem in this application are as follows:

[0025] Compared with the prior art, the utility model is a circuit 1 for adaptively stabilizing the output of a wide power supply of a pure electric vehicle, which simultaneously sets a main control chip, a thermistor RT connected to the No. 4 contact and the No. 8 contact of the main control chip, a capacitor CT and a fixed resistor R911 connected to the No. 4 contact and the No. 5 contact of the main control chip, a first voltage conversion circuit connected to the No. 6 contact of the main control chip, a second voltage conversion circuit connected to the No. 3 contact of the main control chip, and a resistor circuit connected to the No. 2 contact and the No. 1 contact of the main control chip; the first voltage conversion circuit is connected to A ferrite core transformer T902, a MOS tube Q901 and a ferrite core transformer T901; a diode D911, a diode D908 and a resistor R902 are connected to the second transformer circuit; a resistor R913, a capacitor C913, a resistor R934, a resistor R904 and a variable resistor VR902 are connected to the resistor circuit; a primary winding of the ferrite core transformer T901 is connected to the first transformer circuit; a secondary winding of the ferrite core transformer T901 is connected to the second transformer circuit; the ferrite core transformer T The primary winding of 901 is also connected to a rectifier diode circuit; the rectifier diode D901, capacitor C905, negative temperature coefficient thermistor RT1, and fuse FU are connected in the rectifier diode circuit; the resistor R913 is connected in parallel with the capacitor C913; the resistor R934, resistor R904 and variable resistor VR902 are connected in series; the diode D911 and diode D908 are connected in series, and the output end of the diode D911 and the input end of the diode D908 are connected to the resistor R908 through a capacitor. 2; it also includes a voltage-stabilizing diode circuit connected to contact No. 7 of the main control chip and the second transformer circuit; the voltage-stabilizing diode circuit is connected with a capacitor C909 and a voltage-stabilizing diode 1W; the input end of the capacitor C909 is connected to contact No. 7 of the main control chip; the output end of the voltage-stabilizing diode 1W is connected to the second transformer circuit; the drain of the MOS tube Q901 is connected to the ferrite core transformer T901. In actual application, the problem of severe heating of large current loads can be better alleviated through circuit design, thereby improving the safety of line operation.

[0026] The above-described implementation methods of the utility model do not constitute a limitation on the protection scope of the utility model. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model shall be included in the protection scope of the claims of the utility model.

Claims

1. A circuit for adaptive stable output of wide power supply for pure electric vehicles, characterized in that: The invention comprises a main control chip, a thermistor RT connected to the No. 4 contact and the No. 8 contact of the main control chip, a capacitor CT and a fixed resistor R911 connected to the No. 4 contact and the No. 5 contact of the main control chip, a first transformer circuit connected to the No. 6 contact of the main control chip, a second transformer circuit connected to the No. 3 contact of the main control chip, and a resistor circuit connected to the No. 2 contact and the No. 1 contact of the main control chip; the first transformer circuit is connected to a ferrite core transformer T902, a MOS The first transformer circuit is connected to the first transformer circuit; the second transformer circuit is connected to the diode D911, the diode D908 and the resistor R902; the resistor circuit is connected to the resistor R913, the capacitor C913, the resistor R934, the resistor R904 and the variable resistor VR902; the primary winding of the ferrite core transformer T901 is connected to the first transformer circuit; the secondary winding of the ferrite core transformer T901 is connected to the second transformer circuit; the ferrite core The primary winding of the core transformer T901 is also connected to a rectifier diode circuit; the rectifier diode D901, capacitor C905, negative temperature coefficient thermistor RT1, and fuse FU are connected in the rectifier diode circuit; the resistor R913 is connected in parallel with the capacitor C913; the resistor R934, resistor R904 and variable resistor VR902 are connected in series; the diode D911 and diode D908 are connected in series, and the output end of the diode D911 and the input end of the diode D908 are connected to the resistor R902 through a capacitor; it also includes a voltage regulator diode circuit connected to contact No. 7 of the main control chip and the second transformer circuit; the voltage regulator diode circuit is connected with capacitor C909 and voltage regulator diode 1W; the input end of the capacitor C909 is connected to contact No. 7 of the main control chip; the output end of the voltage regulator diode 1W is connected to the second transformer circuit; the drain of the MOS tube Q901 is connected to the ferrite core transformer T901.

2. A circuit for adaptively stabilizing the output of a wide power supply for a pure electric vehicle as claimed in claim 1, characterized in that: The model of the main control chip is MC3842.

3. A circuit for adaptively stabilizing the output of a wide power supply for a pure electric vehicle as claimed in claim 1, characterized in that: The source of the MOS transistor Q91 is connected to the common ground.

4. A circuit for adaptively stabilizing the output of a wide power supply for a pure electric vehicle according to any one of claims 1 to 3, characterized in that: A resistor R910 is also connected to the second transformer circuit; one end of the resistor R910 is connected to contact No. 3 of the main control chip, and the other end is connected to the resistor R902.

5. A circuit for adaptively stabilizing the output of a wide power supply for a pure electric vehicle as claimed in claim 1, characterized in that: The other end of the resistor R904 relative to the variable resistor VR902 is connected to the common ground.

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