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High-voltage start-up circuit

A circuit and detection circuit technology, which is applied in the direction of electrical components, output power conversion devices, etc., can solve problems such as dependence and poor current linearity, and achieve controllable current source, good current linearity, and high-voltage resistance. Effect

Inactive Publication Date: 2011-01-19
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above technical solution, the controlled current source is used to charge the external capacitor, but the disadvantage of this circuit is that the controlled current source largely depends on the high voltage, and the current linearity is not good

Method used

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Examples

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Embodiment 1

[0015] Embodiment one: see attached figure 2 As shown, a high-voltage starting circuit includes a current source, a control switch S and a capacitor. The current source supplied by the input high voltage is connected in series with the capacitor through the control switch S to form a charging circuit. One end of the capacitor is the output end, and the other end is grounded. The control switch S The enabling end of the low-voltage circuit is connected to the control logic output end of the low-voltage circuit, and a negative feedback circuit is provided between the capacitor output end and the current source. The negative feedback circuit is composed of a detection circuit and a feedback control circuit, and the detection circuit is connected in series with the current source. Between the source and the output terminal of the capacitor, the magnitude of the output current is detected, and the feedback control circuit receives the output of the detection circuit and feedbacks a...

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Abstract

The invention discloses a high-voltage start-up circuit which comprises a current source, a control switch and a capacitor, wherein the current source for inputting high-voltage power supply is connected with the capacitor through the control switch to form a charging loop; one end of the capacitor is an output end, and the other end is grounded; and an enabling end of the control switch is connected with a logic control output end of a low-voltage circuit. The start-up circuit is characterized in that a negative feedback circuit is arranged between the output end of the capacitor and the current source, and the negative feedback circuit consists of a detection circuit and a feedback control circuit; the detection circuit is connected between the current source and the output end of the capacitor in series and used for detecting the magnitude of output current; and the feedback control circuit is used for receiving the output of the detection circuit and feedback controlling the current source. In the invention, the current source is feedback controlled according to the magnitude of the output current through arranging the negative feedback circuit, the current is not sensitive to high voltage, and the current linearity is good.

Description

technical field [0001] The invention relates to a high-voltage starting circuit, in particular to a high-voltage starting circuit suitable for power management integrated circuits. Background technique [0002] In the switching power supply circuit, when the protection circuit works due to some abnormal reasons, some circuits will be shut down; when the fault is eliminated, the whole circuit needs a startup circuit to be able to work again. Another function of the startup circuit is to establish an initial operating point for other circuits to start. At the same time, when the circuit starts to work, the startup circuit isolates the input power from the inside, so that the ripple in the input voltage will not affect the internal circuit. play a protective role. [0003] In the prior art, if attached figure 1 As shown, the switching power supply control circuit is mainly composed of a low-voltage circuit and a high-voltage circuit. The control logic of the low-voltage circu...

Claims

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Application Information

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IPC IPC(8): H02M1/36
Inventor 李富华赵鹤鸣王汉祥谢卫国黄秋萍杜坦
Owner SUZHOU UNIV
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