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Switch control circuit, switch control method and switch power supply

A switch control circuit, switch control technology, applied in the field of switch control circuit, switching power supply, switching power supply control, can solve the problem of not being able to directly obtain relevant signals

Pending Publication Date: 2021-11-19
SHENZHEN KIWI MICROELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the control chip needs to detect and obtain the input voltage signal and output voltage signal to realize the relevant protection work, but the relevant signal cannot be directly obtained through the auxiliary winding

Method used

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  • Switch control circuit, switch control method and switch power supply
  • Switch control circuit, switch control method and switch power supply
  • Switch control circuit, switch control method and switch power supply

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Embodiment Construction

[0042] In order to further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only to further illustrate the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0043] The description in this part is only for several typical embodiments, and the present invention is not limited to the scope of the description of the embodiments. Combinations of different embodiments, mutual replacement of some technical features in different embodiments, mutual replacement of the same or similar prior art means and some technical features in the embodiments are also within the scope of description and protection of the present invention.

[0044] "Coupling" or "connection" in the specification includes both direct connection and indirect connection. An indirect connection is a connection through an ...

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Abstract

The invention provides a switch control circuit, a switch control method and a switch power supply. The switch control circuit is used for controlling a switch tube in a switch power supply, and comprises a control chip, wherein the control chip is provided with a multiplexing pin, the multiplexing pin is used for being respectively coupled with the first end and the second end of the switch tube, the second end of the switch tube is coupled with a sampling resistor, in the first state, the control chip obtains a current sampling signal representing the current flowing through the switch tube through the multiplexing pin, in the second state, the control chip obtains a voltage representation signal representing the terminal voltage of the first end of the switch tube through the multiplexing pin, and the control chip controls the switch tube according to the current sampling signal and the voltage representation signal. According to the switch control circuit, the switch control method and the switch power supply provided by the invention, an auxiliary winding in the switch power supply can be omitted, the pin arrangement of a control chip is simplified by adopting a pin multiplexing form, and the system cost is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of power electronics and relates to a switching power supply control technology, in particular to a switching control circuit, a switching control method and a switching power supply. Background technique [0002] Power factor PF is the ratio of AC input active power to input apparent power. The power factor PF can measure the degree of effective use of power. The lower the power factor PF, the greater the reactive power of the electrical equipment, the lower the utilization rate of electric energy, and the larger harmonic component of the input current, which will cause distortion of the input current waveform. The power grid causes pollution, and in serious cases, it will also lead to damage to electrical equipment. Therefore, it is necessary to select a power factor correction circuit to improve the power factor PF of the switching power supply. In the switching power supply, in the discontinuous mode (...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M7/217H02M7/219H02M1/08
CPCH02M3/33523H02M7/217H02M7/219H02M1/08
Inventor 俞秀峰夏飞鹏
Owner SHENZHEN KIWI MICROELECTRONICS CO LTD
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