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Primary side feedback switching power supply control chip, control system and charger

A switching power supply, primary-side feedback technology, applied in electrical components, output power conversion devices, AC power input into DC power output and other directions, can solve problems such as poor performance and different expressions of inductor peak current

Pending Publication Date: 2018-12-18
SHENZHEN FM ELECTRONICS GRP CO LTD
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AI Technical Summary

Problems solved by technology

[0004] The present invention provides a self-powered primary-side feedback switching power supply control system, aiming to solve the problem of the primary-side inductance peak current expression in the self-power supply mode and non-self-power supply mode in the self-powered primary-side feedback switching power supply control system in the traditional technical solution The problem of poor performance caused by different formats

Method used

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  • Primary side feedback switching power supply control chip, control system and charger
  • Primary side feedback switching power supply control chip, control system and charger
  • Primary side feedback switching power supply control chip, control system and charger

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] figure 1 A schematic diagram of the module of the primary-side feedback switching power supply control chip provided by the preferred embodiment of the present invention is shown. For the convenience of description, only the parts related to this embodiment are shown, and the details are as follows:

[0028] refer to figure 1 , a primary side feedback switching power supply control chip, has a power supply pin VCC, a ground pin GND, a voltage feedback pin CS, a current input pin OB, and a power switch pin OC, including: a voltage monitoring unit 100, a reference voltage unit 200 , a compar...

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Abstract

A primary side feedback switching power supply control chip includes a reference voltage unit, a comparator unit, a voltage monitoring unit, a driving unit, a switch unit and a rectifying unit, the switch power supply control chip omits a self-powered time generator, the self-supply time within a single cycle is determined by the voltage at the voltage feedback pin of the switching power supply control chip. In addition, an energy storage module for supplying power to the switching power supply control chip is connected between a power supply pin and a voltage feedback pin of the switching power supply control chip, so that whether the control system operates in the self-powered mode or the non-self-powered mode, The current is passed through the voltage sampling module, so that the peak current expression of the energy storage transformer module is the same, so that the performance of the control system is not affected in the self-powered mode, the minimum load capacity is strong in the constant voltage mode, the constant current precision is high and the linear adjustment rate is good in the constant current mode.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a primary-side feedback switching power supply control chip, a control system and a charger. Background technique [0002] At present, the primary-side feedback switching power supply control chip includes a self-power supply time generator, and the self-power supply time in a single cycle is determined by the built-in fixed time; in addition, the power supply capacitor of the switching power supply control chip is connected to the power supply of the primary-side feedback switching power supply control chip pin and the ground pin, however, due to the difference in the control mode of the self-power supply mode and the non-self-power supply mode of the power-off control system, the peak current expression of the primary side inductance in the self-power supply mode and the non-self-power supply mode different, resulting in different peak currents of the pr...

Claims

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Application Information

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IPC IPC(8): H02M7/217
CPCH02M7/217
Inventor 阳玉才胡渊
Owner SHENZHEN FM ELECTRONICS GRP CO LTD
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