Wide voltage control circuit

Abstract

The utility model relates to the field of power supplies, in particular to a wide voltage control circuit capable of being remotely controlled. Comprising a main control chip, a communication circuit, a step-down chip and an adjustable resistor, the main control chip is connected with an upper computer through the communication circuit and used for receiving a power supply control instruction of the upper computer, the input end of the step-down chip is connected with input voltage, the output end of the step-down chip is connected with converted voltage, and the adjustable resistor is connected with the feedback end FB of the step-down chip. And the main control chip is connected with the enabling end of the voltage reduction chip. According to the utility model, the on-off and output voltage range of the wide-voltage circuit can be remotely adjusted, the automation degree is high, and the human input is reduced.

Description

Technical Field

[0001] The utility model relates to the field of power supplies, in particular to a wide-voltage control circuit capable of remote control. Background Art

[0002] There are many wide-voltage circuits on the market, but few have the function of remotely controlling the output voltage. This requires more manpower when using them, that is, manpower is needed to adjust the on / off state or output voltage range of the wide-voltage circuit. For some wide-voltage circuits installed in mountains or wilderness, more manpower is required. Utility Model Content

[0003] In view of the defects of the prior art, the utility model provides a wide voltage control circuit, which can remotely adjust its on / off and output voltage range, has a high degree of automation, and reduces manpower investment.

[0004] In order to solve the technical problem, the technical solution adopted by the utility model is: a wide voltage control circuit, including a main control chip, a communication circuit, a step-down chip and an adjustable resistor. The main control chip is connected to the host computer through the communication circuit and is used to receive power control instructions from the host computer. The input end of the step-down chip is connected to the input voltage, the output end of the step-down chip is connected to the converted voltage, the adjustable resistor is connected to the feedback end FB of the step-down chip, and the main control chip is connected to the enable end of the step-down chip.

[0005] Furthermore, the adjustable resistor is a programmable resistor, and I2C communication is used between the main control chip and the programmable resistor. The low potential end L of the programmable resistor is grounded, the high potential end H is connected to the positive pole of the output end, and the adjustment end W is connected to the feedback end FB of the buck chip.

[0006] Furthermore, the communication circuit is an RS485 circuit, and the RS485 circuit is implemented based on the chip MAX3485.

[0007] Furthermore, the programmable resistor model is MAX5432.

[0008] Furthermore, the model of the step-down chip is LM2596S-ADJ, and capacitors CIN and C0 are provided in parallel between the positive pole of the input terminal and the negative pole of the input terminal of the step-down chip, and a diode D1 and a capacitor C0 are provided in parallel between the positive pole of the output terminal and the negative pole of the output terminal of the step-down chip, and an inductor L1 is provided between the positive pole of the output terminal and the positive output voltage, the negative pole of the diode D1 is connected to the positive pole of the output terminal, the positive pole of the diode D1 is connected to the negative pole of the output terminal, and the negative pole of the input terminal and the negative pole of the output terminal are both grounded.

[0009] Furthermore, the model of the main control chip is XM1008F6P6.

[0010] Furthermore, the input voltage of the step-down chip is 3V-40V, the output voltage is 1.5V-35V, and the peak output current is 3A.

[0011] The beneficial effects of this utility model include the addition of a main control chip to the wide-voltage circuit. This main control chip communicates with a host computer via a communication circuit, thereby receiving information from the host computer's power control chip. The main control chip is connected to the enable terminal of the wide-voltage circuit or the control terminal of an adjustable resistor, thereby controlling the wide-voltage circuit's on / off state and output voltage range. This utility model allows for remote adjustment of the wide-voltage circuit's on / off state and output voltage range, resulting in a high degree of automation and reduced labor input. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the wide voltage control circuit described in Example 1. DETAILED DESCRIPTION

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0014] Example 1

[0015] This embodiment discloses a wide voltage control circuit, such as Figure 1 As shown, it includes a main control chip, a communication circuit, a step-down chip and an adjustable resistor. The main control chip is connected to the host computer through the communication circuit and is used to receive power control instructions from the host computer. The input end of the step-down chip is connected to the input voltage, the output end of the step-down chip is connected to the converted voltage, the adjustable resistor is connected to the feedback end FB of the step-down chip, and the main control chip is connected to the enable end of the step-down chip.

[0016] The main control chip uses the domestic control chip XM1008F6P6, which is small in size, has few pins, powerful functions and low price. The PA1 and PA2 pins of the main control chip are connected to the communication circuit. In this embodiment, the communication circuit is an RS485 communication circuit, which is implemented using the integrated circuit MAX3485.

[0017] The model of the step-down chip is LM2596S-ADJ. Capacitors CIN and C0 are connected in parallel between the positive input terminal and the negative input terminal of the step-down chip. A diode D1 and capacitor C0 are connected in parallel between the positive output terminal and the negative output terminal of the step-down chip. In addition, an inductor L1 is provided between the positive output terminal and the positive output voltage. The negative pole of the diode D1 is connected to the positive output terminal, and the positive pole of the diode D1 is connected to the negative output terminal. The negative input terminal and the negative output terminal are both grounded.

[0018] The step-down chip has an input voltage range of 3V-40V, an output voltage range of 1.5V-35V, and a peak output current of 3A. Under specific input voltage and output load conditions, the output voltage tolerance is guaranteed to be within ±4%, and the oscillation frequency tolerance is within ±15%. It can achieve external power-off with a standby current of only 80uA and features self-protection circuitry. The enable pin (ON / OFF) of the step-down chip is connected to pin PA4 of the main control chip, allowing for remote power-on and power-off.

[0019] In this embodiment, the adjustable resistor is a MAX5432 programmable resistor. I2C communication is used between the main control chip and the programmable resistor. Specifically, the SCL and SDA pins of the MAX5432 programmable resistor are connected to the PA10 and PA11 pins of the main control chip to receive specific output voltage adjustment commands. The low-potential terminal L of the programmable resistor is grounded, the high-potential terminal H is connected to the positive output terminal, and the adjustment terminal W is connected to the feedback terminal FB of the step-down chip. The main control chip adjusts the resistance of the adjustable resistor based on the command. The adjustable resistor is connected to the feedback terminal FB of the step-down chip, thereby adjusting the output voltage range of the step-down chip.

[0020] The utility model can adapt to a wide voltage input range of 4.5V~28V, meeting the stable working requirements in different environments. The output voltage can be remotely adjusted through an external RS485, and the output voltage range can be 1.5V~28V; and the output end can be remotely powered on and off.

[0021] The above description is only the basic principle and preferred embodiments of the present invention. Improvements and substitutions made by those skilled in the art based on the present invention fall within the scope of protection of the present invention.

Claims

1. A wide voltage control circuit, characterized in that: It includes a main control chip, a communication circuit, a step-down chip and an adjustable resistor. The main control chip is connected to the host computer through the communication circuit and is used to receive power control instructions from the host computer. The input end of the step-down chip is connected to the input voltage, the output end of the step-down chip is connected to the converted voltage, the adjustable resistor is connected to the feedback end FB of the step-down chip, and the main control chip is connected to the enable end of the step-down chip.

2. The wide-voltage control circuit according to claim 1, wherein: The adjustable resistor is a programmable resistor. I2C communication is used between the main control chip and the programmable resistor. The low potential end L of the programmable resistor is grounded, the high potential end H is connected to the positive pole of the output end, and the adjustment end W is connected to the feedback end FB of the buck chip.

3. The wide voltage control circuit according to claim 1, wherein: The communication circuit is an RS485 circuit, which is implemented based on the chip MAX3485.

4. The wide-voltage control circuit according to claim 2, wherein: The programmable resistor model is MAX5432.

5. The wide voltage control circuit according to claim 1, wherein: The model of the step-down chip is LM2596S-ADJ. Capacitors CIN and C0 are connected in parallel between the positive input terminal and the negative input terminal of the step-down chip. A diode D1 and capacitor C0 are connected in parallel between the positive output terminal and the negative output terminal of the step-down chip. In addition, an inductor L1 is provided between the positive output terminal and the positive output voltage. The negative pole of the diode D1 is connected to the positive output terminal, and the positive pole of the diode D1 is connected to the negative output terminal. The negative input terminal and the negative output terminal are both grounded.

6. The wide voltage control circuit according to claim 1, wherein: The model of the main control chip is XM1008F6P6.

7. The wide voltage control circuit according to claim 1, wherein: The input voltage of the step-down chip is 3V-40V, the output voltage is 1.5V-35V, and the peak output current is 3A.

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