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Dual-chip power supply circuit

A power supply circuit, double-chip technology, applied in the direction of electrical components, output power conversion devices, etc., can solve problems such as inability to quickly respond to output voltage changes, and achieve the effect of simplifying the drive circuit

Pending Publication Date: 2019-04-02
JOULWATT TECH INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a dual-chip power supply circuit using a high-voltage process to solve the problem in the prior art that it cannot respond quickly to changes in output voltage

Method used

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Embodiment Construction

[0058] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.

[0059] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0060] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...

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Abstract

The invention discloses a dual-chip power supply circuit comprising an inductor, a turn-on element, a first chip and a second chip, wherein the second chip comprises a first switching tube and a driving control circuit; the first chip comprises a control circuit; the input end of the power supply circuit is connected to the first end of the first switch tube connected to the second chip; the second end of the first switch tube of the second chip is connected to the common end of the inductor and the turn-on element; and the control circuit of the first chip receives a feedback signal; the driving control circuit of the second chip receives the output voltage of the first chip; the low-voltage end of the output end is the reference ground of the control circuit of the first chip; the commonend of the inductor and the turn-on element is the reference ground of the driving control circuit of the second chip; and the feedback signal represents output voltage, output current, output power,input voltage, input current, or input power. The dual-chip power supply circuit can quickly adjust the output voltage in real time, and ensures the stability of the output voltage and the dynamic load regulation characteristics.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a double-chip power supply circuit. Background technique [0002] In the high-voltage process, only the DRAIN end of the MOS tube can withstand high voltage (about 700V), while the other ends of the MOS tube and other devices can only withstand low voltage (within about 50V). Such as figure 1 As shown, it is a BUCK step-down circuit, and the dotted line box is a chip using a high-voltage process, including a MOS transistor Q1 and a drive control circuit, wherein the switch node SW is the reference ground GND of the chip. The drive control circuit samples the output voltage Vo through the output divider resistors R1 and R2. When the freewheeling diode D1 is turned off and the MOS transistor Q1 is turned on, the voltage of SW is equal to the input voltage, and the voltage sampled on the feedback voltage FB is the difference between the output voltage and the input volta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08
CPCH02M1/08
Inventor 龙昊周逊伟
Owner JOULWATT TECH INC LTD
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