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Switching device

A switching device and switching power technology, which is applied in the field of switching devices with high voltage startup, can solve the problems of high JFET withstand voltage requirements, high resistance power consumption, large standby power consumption, etc.

Active Publication Date: 2018-10-02
WUXI CRYSTAL SOURCE MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The start-up part of a general switching power supply is realized by connecting a large resistor to the high-voltage input terminal. However, since the circuit has certain requirements for the start-up current, the resistance should not be too large, which will cause relatively large power consumption on the resistor. It consumes power all the time during standby, resulting in excessive standby power consumption, which cannot meet the requirements of level-6 energy efficiency
Using a JFET tube to start the control circuit, and turning off the JFET tube after the control circuit is started can greatly reduce the standby power consumption of the switching power supply, but since the input terminal is connected to a high-voltage power supply, the JFET has a high withstand voltage requirement, and it needs to be done To 700V or more, it is difficult to integrate into the circuit

Method used

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Embodiment Construction

[0058] Herein, the detailed content and technical description of the present invention will be further described with a preferred embodiment, but it should not be construed as a limitation to the implementation of the present invention.

[0059] See Figure 1-5 , figure 1 It is a longitudinal structural diagram of a switching device according to an embodiment of the present invention; figure 2 It is a plane structure diagram of a switching device according to an embodiment of the present invention; image 3 It is a device description diagram of a switching device according to an embodiment of the present invention; Figure 4 It is an equivalent circuit diagram of a switching device according to an embodiment of the present invention; Figure 5 It is an application explanatory diagram of a switching device according to an embodiment of the present invention. Such as Figure 1-5 As shown, the switching device 10 includes a switching power tube 11 and a start-up transistor ...

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Abstract

The invention discloses a switching device. The switching device is electrically connected with a control circuit; the switching device comprises a switching power tube and a startup transistor; the startup transistor is integrated in the switching power tube; the startup transistor receives startup current, is turned on and starts the control circuit; and the control circuit controls the switching power tube to be turned on; and after the control circuit works normally, the voltage of the startup transistor is controlled by the control circuit, so that the startup transistor can be turned off.

Description

technical field [0001] The invention relates to the technical field of semiconductor device manufacturing, in particular to a switching device with high-voltage starting. Background technique [0002] Power supply is an essential part of various electronic devices, and switching power supply is known as high-efficiency and energy-saving power supply, which is widely used in power adapters and chargers of various electronic products; with the strengthening of people's awareness of environmental protection, the requirements for switching power supply It is also getting higher and higher, especially the introduction of six-level energy efficiency, which has clear requirements for the efficiency and standby power consumption of switching power supplies. The start-up part of a general switching power supply is realized by connecting a large resistor to the high-voltage input terminal. However, since the circuit has certain requirements for the start-up current, the resistance sho...

Claims

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Application Information

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IPC IPC(8): H01L27/07
CPCH01L27/0711
Inventor 马晓辉尹岱王海兵
Owner WUXI CRYSTAL SOURCE MICROELECTRONICS CO LTD
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