Input power supply overcurrent protection circuit based on high-power vehicle-mounted equipment

Abstract

The utility model relates to the technical field of integrated circuits, in particular to an input power supply overcurrent protection circuit based on high-power vehicle-mounted equipment, which comprises a power supply, a capacitor C1, a capacitor C2, a resistor R1 and a chip B1, one end of the resistor R1 is connected with the seventh pin ILIM of the chip B1, and the other end of the resistor R1 is grounded; an eighth pin GND1 and a seventeenth pin GND2 of the chip B1 are connected with one end of a capacitor C1, and the other end of the capacitor C1 is connected with a power supply input positive electrode 24VVIN; a first pin VOUT1, a fourth pin VOUT2, a ninth pin VOUT4 and a twelfth pin VOUT3 of the chip B1 are connected with one end of the capacitor C2, and the other end of the capacitor C2 is connected with a power supply output 24VOUT; a power supply input positive pole 24VVIN is connected with a second pin VIN1, a third pin VIN2, a tenth pin VIN4, an eleventh pin VIN3, a thirteenth pin EN4, a fourteenth pin EN3, a fifteenth pin EN2, a sixteenth pin EN1 and one end of a capacitor C1. The over-current protection circuit not only can realize over-current protection of an input power supply, but also can overcome the defect that a traditional fuse only protects once.

Description

Technical Field

[0001] The utility model relates to the technical field of integrated circuits, in particular to an overcurrent protection circuit for the input power supply of high-power vehicle-mounted equipment. Background Art

[0002] Existing overcurrent protection circuits for the power input of high-power vehicle-mounted equipment all use fuses. Once overcurrent occurs and the fuse blows, a new one needs to be replaced. If a spike occurs accidentally and causes the fuse to be damaged, it will be extremely troublesome, that is, the cause cannot be found, and the fuse is damaged in vain, losing its function of placement.

[0003] In addition, there is also a self-resetting fuse, but the current cannot be made large enough to meet the current requirements of high-power vehicle-mounted equipment. Summary of the Utility Model

[0004] Aiming at the above-mentioned disadvantages or deficiencies of the existing technologies, the utility model provides an overcurrent protection circuit for the input power supply of high-power vehicle-mounted equipment, which can not only achieve overcurrent protection of the input power supply, but also solve the disadvantage that traditional fuses can only provide protection once.

[0005] To achieve the above object, the utility model is realized through the following technical solutions:

[0006] An overcurrent protection circuit for the input power supply of high-power vehicle-mounted equipment includes: a power supply, a capacitor C1, a capacitor C2, a resistor R1, and a chip B1;

[0007] One end of the resistor R1 is connected to the 7th pin ILIM of the chip B1, and the other end of the resistor R1 is grounded;

[0008] The 8th pin GND1 and the 17th pin GND2 of the chip B1 are connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the positive input of the power supply 24V_VIN;

[0009] The 1st pin VOUT1, the 4th pin VOUT2, the 9th pin VOUT4, and the 12th pin VOUT3 of the chip B1 are connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to the power output 24V_OUT;

[0010] The positive input of the power supply 24V_VIN is connected to the 2nd pin VIN1, the 3rd pin VIN2, the 10th pin VIN4, the 11th pin VIN3, the 13th pin EN4, the 14th pin EN3, the 15th pin EN2, the 16th pin EN1 of the chip B1, and one end of the capacitor C1;

[0011] The power ground is connected to the 8th pin GND1, the 17th pin GND2 of the chip B1, the other end of the capacitor C1, and the other end of the capacitor C2.

[0012] Further, the chip B1 uses a diode of model N IV3071.

[0013] Further, the capacitors C1 and C2 are filter capacitors.

[0014] Further, the resistance value of the resistor R1 is 25K.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1. This solution can achieve overcurrent protection for the power supply of high-power vehicle-mounted devices;

[0017] 2. It can provide overcurrent protection multiple times, automatically resume output after the overcurrent phenomenon disappears, and can be used repeatedly. Description of the Drawings

[0018] Figure 1 It is a circuit schematic diagram of an overcurrent protection circuit for the input power supply of a high-power vehicle-mounted device according to the present utility model. Detailed Embodiments

[0019] The following will describe in detail the specific embodiments of the present utility model with reference to the drawings. However, it should be understood that the protection scope of the present utility model is not limited by the specific embodiments.

[0020] Unless otherwise clearly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "having" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0021] An overcurrent protection circuit for the input power supply of a high-power vehicle-mounted device, as Figure 1 shown, includes: a power supply, a capacitor C1, a capacitor C2, a resistor R1, and a chip B1; one end of the resistor R1 is connected to the 7th pin I L I M of the chip B1, and the other end of the resistor R1 is grounded; the 8th pin GND1 and the 17th pin GND2 of the chip B1 are connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the positive input of the power supply 24V_VI N; the 1st pin VOUT1, the 4th pin VOUT2, the 9th pin VOUT4, and the 12th pin VOUT3 of the chip B1 are connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to the power output 24V_OUT; the positive input of the power supply 24V_VI N is connected to the 2nd pin VI N1, the 3rd pin VI N2, the 10th pin VI N4, the 11th pin VI N3, the 13th pin EN4, the 14th pin EN3, the 15th pin EN2, the 16th pin EN1 of the chip B1, and one end of the capacitor C1; the power ground is connected to the 8th pin GND1, the 17th pin GND2 of the chip B1, the other end of the capacitor C1, and the other end of the capacitor C2.

[0022] Chip B1 uses a diode of model N IV3071. Capacitors C1 and C2 are filter capacitors. The resistance value of resistor R1 is 25K.

[0023] The main working principle of the present utility model is as follows: when the power supply is correctly connected, B1 conducts and 24V_VOUT has an output. When the output current of 24V_VOUT exceeds 10A, B1 turns off and 24V_VOUT has no output. After the overcurrent phenomenon is detected to disappear, the 24V_VOUT output is automatically restored.

[0024] The protection circuit of the present utility model can achieve overcurrent protection for the power supply of high-power vehicle-mounted equipment, and can perform multiple overcurrent protections. After the overcurrent phenomenon disappears, the output is automatically restored and can be used repeatedly.

[0025] The above content is only an embodiment of the present utility model. Specific structures and common knowledge such as characteristics that are well known in the solution are not described in detail here. It is easy for those skilled in the art to understand that the protection scope of the present utility model is obviously not limited to these specific implementation manners. Without departing from the present utility model, several deformations and improvements can be made, and these should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent.

Claims

1. A circuit for overcurrent protection of input power supply of high-power vehicle-mounted equipment, characterized in that: include: Power supply, capacitor C1, capacitor C2, resistor R1, chip B1; One end of the resistor R1 is connected to the 7th pin ILIM of the chip B1, and the other end of the resistor R1 is grounded; The 8th pin GND1 and the 17th pin GND2 of the chip B1 are connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the positive electrode 24V_VIN of the power input; The first pin VOUT1, the fourth pin VOUT2, the ninth pin VOUT4 and the twelfth pin VOUT3 of the chip B1 are connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to the power output 24V_OUT; The positive pole of the power input 24V_VIN is connected to the 2nd pin VIN1, the 3rd pin VIN2, the 10th pin VIN4, the 11th pin VIN3, the 13th pin EN4, the 14th pin EN3, the 15th pin EN2, the 16th pin EN1 of the chip B1, and one end of the capacitor C1; The power ground is connected to the 8th pin GND1, the 17th pin GND2 of the chip B1, the other end of the capacitor C1, and the other end of the capacitor C2.

2. The overcurrent protection circuit based on the input power supply of high-power vehicle-mounted equipment according to claim 1 is characterized in that: The chip B1 uses a NIV3071 diode.

3. The overcurrent protection circuit based on the input power supply of high-power vehicle-mounted equipment according to claim 2 is characterized in that: The capacitors C1 and C2 are filter capacitors.

4. The overcurrent protection circuit based on the input power supply of high-power vehicle-mounted equipment according to claim 3 is characterized in that: The resistance of the resistor R1 is 25K.

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