Voltage regulation circuit and its control method

Abstract

The invention discloses a voltage regulator circuit and a control method thereof. The voltage regulator circuit comprises a first switch tube and a control circuit, wherein the drive end of the control circuit is connected with the control end of the first switch tube. A first power supply end of the control circuit is connected with one end of the input voltage through a first resistor, and a second power supply end of the control circuit is connected with the other end of the input voltage, thereby the common end of the first power supply and the second power supply of the control circuit becomes a first node. A first end of the first switch tube is connected with the first node, and a second end of the first switch tube is connected with the control end of the first switch tube through a second resistor. The second end of the first switch tube is a first end of the output voltage of the voltage regulator circuit, and the end, connected with the first resistor, of input voltage end is a second end of the output voltage. By means of the low-voltage circuit, the voltage regulator circuit can be applied in high-voltage input situations, and provide an essentially constant output voltage under different input voltages.

Description

technical field [0001] The present invention relates to the technical field of power electronics, and more specifically, to a voltage regulating circuit and a control method thereof. Background technique [0002] The voltage regulation circuit receives the power supply voltage, and outputs the expected output voltage according to the requirements of the load or the application occasion, and can also control the output voltage to be in a constant voltage state. A linear voltage regulation circuit is a commonly used voltage regulation circuit, but the linear voltage regulation circuit in the prior art is generally used in a low-dropout application, and both the input voltage and the output voltage are relatively low. For example, a low dropout regulator (low dropout regulator, LDO for short). [0003] figure 1 Shown is the schematic diagram of the prior art linear step-down circuit. By adjusting the transistor M01, the input voltage is stepped down to obtain the output volt...

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Problems solved by technology

[0004] However, when the input and output voltages are high voltages, such as hundreds of volts or hundreds of volts, the gate of the linear transistor is a high voltage of hundreds of volts or hundreds of volts to the system ground, so the drive circuit of the transistor needs to withstand the corresponding high voltage. State-of-the-art voltage regulation circuits cannot solve the above technical problems, which affects the application of voltage regulation circuits in the high-voltage field

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