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Power control circuit and electronic equipment system

A technology of power control circuit and control circuit, which is applied in the field of power supply and can solve problems such as high components and large fluctuating current of PFC circuit

Active Publication Date: 2021-06-15
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a power supply control circuit and an electronic equipment system to solve the problem that the existing power supply control circuit requires higher specification components due to the large fluctuating current through the PFC circuit

Method used

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  • Power control circuit and electronic equipment system
  • Power control circuit and electronic equipment system
  • Power control circuit and electronic equipment system

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Embodiment Construction

[0046] Such as figure 1 As shown, when the PFC control circuit controls the switch tube V1 to turn on, the power supply stores energy in the inductor L1; when the PFC control circuit controls the switch tube V1 to turn off, the energy of the inductor L1 is released through VD1 to charge the electrolytic capacitor C2. When the pulse modulation control circuit controls the switch tube V2 to turn on, the electrolytic capacitor C2 releases energy through the transformer T1, and the transformer T1 converts the released energy to obtain the required working voltage.

[0047] Those skilled in the art can understand that in the existing power supply control circuit, the driving sequence of the PFC circuit of the front stage and the power conversion circuit of the rear stage is uncontrollable, and the electrolytic capacitor C2 will bear the charging current flowing out of the front stage and the power conversion circuit of the rear stage at the same time. The discharge current required...

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PUM

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Abstract

The invention provides a power supply control circuit and an electronic equipment system. The power supply control circuit includes: a rectification filter circuit, a PFC circuit, a PFC control circuit, a synchronous circuit, a pulse modulation control circuit and a power conversion circuit. Wherein, the rectification filter circuit is connected with the PFC circuit, and the control terminal of the PFC circuit is connected with the PFC control circuit. The output end of the PFC circuit is connected to the input end of the power conversion circuit, the control end of the power conversion circuit is connected to the pulse modulation control circuit, the synchronization circuit is respectively connected to the PFC control circuit and the pulse modulation control circuit, and the synchronization circuit can control the PFC in the PFC control circuit. When the circuit stops charging, it sends a synchronous signal to the pulse modulation control circuit, so that the pulse modulation control circuit controls the power conversion circuit to charge through the PFC circuit. The invention reduces the ripple current in the PFC circuit and reduces the type selection specifications of components and parts.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a power supply control circuit and an electronic equipment system. Background technique [0002] Many power control circuits apply power factor correction (Power Factor Correction, PFC) to correct the line current to generate a sinusoidal input current waveform that is in phase with the line voltage. In this way, disposing a PFC circuit at the front end of the power conversion circuit can prevent unnecessary power loss and heat dissipation in the power delivery system. [0003] figure 1 The circuit schematic diagram of the existing power control circuit provided for the present invention, as figure 1 As shown, the general power supply control circuit includes: PFC circuit, power conversion circuit, PFC control circuit and pulse modulation control circuit ( figure 1 (Pulse Width Modulation, PWM) / Pulse Frequency Modulation (Pulse Frequency Modulation, PFM) control circuit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/42
CPCH02M3/33569H02M1/42Y02B70/10
Inventor 赵杨威高宽志王健新
Owner HISENSE VISUAL TECH CO LTD
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