Switch control circuit and control method

A switching control circuit, switching circuit technology, applied in electronic switches, circuit devices, control/regulation systems, etc., can solve the problems of output voltage drop, output voltage fluctuation, etc.

Active Publication Date: 2017-09-29
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the first solution, this method can reduce the system loss due to the use of transistors, but the disadvantage is that in order to achieve the effect of unidirectional conduction (to prevent current backflow), the MOS transistor will be turned off before the ready voltage switching and after the complete switching, such as Figure 2B From t1 to t3, this will result in an output conversion drop voltage that is one diode drop lower than the output voltage during the switching process, such as Figure 2B In some applications (such as USB PD) the output

Method used

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  • Switch control circuit and control method
  • Switch control circuit and control method

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Embodiment Construction

[0062] Several 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 on the spirit and scope of the present invention. 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.

[0063] refer to Figure 4 Shown is a circuit block diagram of a switch control circuit according to the present invention, Figure 5 It is a specific circuit diagram of the switch control circuit. The switch control circuit is used to control a multi-way switch circuit, and the multi-way switch circuit includes a first switch circuit to ...

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Abstract

The invention discloses a switch control circuit and control method. When an external input voltage is needed to be switched, a logic control circuit outputs a feedback control signal, a feedback circuit participating the switching process is used for selectively accessing a reference voltage signal to a feedback loop needed to be switched according to a feedback control signal, so that the switch action of the corresponding switch circuit is controlled, and the purpose of switching the input voltage is achieved. By the switching mode, an output voltage can be enabled not to be drop during the channel switching process, and an output value is stable.

Description

technical field [0001] The invention relates to the field of switching power supplies, and more specifically, to a switching control circuit and a control method. Background technique [0002] In some applications with multiple input interfaces and single output ports, it is necessary to switch between different input power sources to output desired output voltage signals. Such as Figure 1A Shown is the first voltage switching method in the prior art, such as Figure 1A In the circuit diagram shown, taking two input interfaces as an example, the switching of multiple inputs is realized through the unidirectional conduction characteristic of the diode. Figure 1B shown as Figure 1A The waveform diagram shown. [0003] A diode is connected to the branch of each input port, the anode of the diode is connected to the input port, and the cathode is connected to the output port. When the voltage VIN1 of the first input terminal needs to be used, the voltage VIN1 is powered on,...

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Application Information

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IPC IPC(8): H02M3/158H02J9/06
CPCH02J9/061H02M3/1584H02J1/102H02M1/0003H02M3/158H02M3/157H03K17/6874H03K17/693H02J4/00
Inventor 蔡勇斌李俊杰
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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