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power supply unit

A technology of power supply device and power conversion circuit, applied in the direction of output power conversion device, electrical components, etc., can solve the problem that the feedback response speed of the feedback circuit cannot keep up, the output voltage is unstable, and the gain and bandwidth of the feedback circuit are difficult to control, etc. problems, to achieve the effect of improving the speed of feedback response

Active Publication Date: 2022-01-11
ACER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the load varies widely from no-load to heavy-load, the frequency of the PWM signal also changes greatly, which makes it difficult to control the gain and bandwidth of the feedback circuit, making the feedback response speed of the feedback circuit unable to keep up with the pulse width. Modulation signal changes or load changes
In this way, there will be a problem of unstable output voltage

Method used

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Embodiment Construction

[0050] figure 1 is a schematic block diagram of a power supply device according to an embodiment of the present invention. Please refer to figure 1 The power supply device 100 may be, for example, a variable frequency and voltage stabilized power supply device, but is not limited thereto. The power supply device 100 may include a PWM signal generation circuit 110 , a power conversion circuit 120 , a voltage divider circuit 130 , a capacitor circuit 140 and a feedback compensation circuit 150 , but the invention is not limited thereto. The PWM signal generating circuit 110 is used for generating a PWM signal SP according to the feedback signal SFB, and can modulate at least one of frequency and duty cycle of the PWM signal SP according to the feedback signal SFB. The power conversion circuit 120 is coupled to the PWM signal generation circuit 110 to receive the PWM signal SP. The power conversion circuit 120 can convert the input voltage VI to the output voltage VO according...

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Abstract

The invention provides a power supply device. The power supply device includes a pulse width modulation signal generation circuit, a power conversion circuit, a voltage divider circuit, a capacitor circuit and a feedback compensation circuit. The pulse width modulation signal generation circuit generates and modulates the pulse width modulation signal according to the feedback signal. The power conversion circuit converts the input voltage into an output voltage according to the pulse width modulation signal. The voltage dividing circuit divides the output voltage to generate a first voltage to the node. The capacitor circuit generates a second voltage to the node according to the output voltage in response to a voltage change of the output voltage. Before the output voltage is ready, the feedback compensation circuit generates a feedback signal according to the first voltage and the reference voltage. After the output voltage is ready, the feedback compensation circuit generates a feedback signal according to the second voltage and the reference voltage.

Description

technical field [0001] The invention relates to a power supply technology, in particular to a power supply device capable of improving feedback response speed. Background technique [0002] Generally speaking, in a PWM-based power supply device, the power supply device usually has a feedback circuit and a PWM controller. The feedback circuit can provide a feedback signal according to the change of the load of the power supply device (no load, light load, medium load, full load), and the pulse width modulation controller can adjust the duty cycle of the pulse width modulation signal accordingly according to the feedback signal Or frequency, in order to stabilize the output voltage provided by the power supply device. [0003] Since the load varies widely from no-load to heavy-load, the frequency of the PWM signal also changes greatly, which makes it difficult to control the gain and bandwidth of the feedback circuit, making the feedback response speed of the feedback circuit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/00
CPCH02M1/00H02M1/0025
Inventor 詹子增
Owner ACER INC