Switching device

A switching device and switching power technology, which is applied in the direction of semiconductor devices, electric solid-state devices, electrical components, etc., can solve the problems of high withstand voltage requirements of JFET, large resistance power consumption, and large standby power consumption.
CN108615729BActive Publication Date: 2020-12-01WUXI CRYSTAL SOURCE MICROELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WUXI CRYSTAL SOURCE MICROELECTRONICS CO LTD
Publication Date
2020-12-01

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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.
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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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