Power supply switching circuit

A power switching and circuit technology, applied in the electronic field, can solve problems such as unfavorable product miniaturization and component performance degradation, and achieve the effects of fast switching, reducing process costs, and avoiding damage

Active Publication Date: 2013-03-27
PHICOMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] b. Since the transistor will generate a large amount of power consumption, it must also be used with a heat sink. At the same time, an excessive te

Method used

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Embodiment Construction

[0044] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0045] Figure 4 It is a functional block diagram of a power switching circuit in an embodiment of the present invention; as Figure 4 As shown, a power switching circuit includes a main power supply, a backup power supply, an isolation unit, electrical equipment, a control unit, a protection unit and a switching unit, and the control unit includes a high-speed triode, the switching unit includes a P-channel field effect transistor, and the protection unit It includes two voltage-stabilizing diodes in reverse series, and the isolation unit includes multiple low-conduction and low-loss voltage diodes.

[0046] Specifically, the main power supply is electrically connected to the user equipment to provide electric energy for the user equipment; the backup power supply is connected to the electrical equipment through the switching unit, and the contr...

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Abstract

The invention relates to the technical field of electronic equipment, in particular to a power supply switching circuit. A switch composed of a field-effect tube is controlled by branch voltages of main power supply voltages, a voltage-regulator diode is arranged as a protection unit, a low break-over voltage low-loss diode separates a main power supply from a reserve power supply, the circuit is simplified while the main/reserve power supply is rapidly switched, and the process cost is reduced; and simultaneously, and damages to power apparatuses caused by charging between the main power supply and the reserve power supply are prevented effectively by using the low break-over voltage low-loss diode while the switch is protected for the protection unit.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a power switching circuit. Background technique [0002] At present, with the rapid development of information technology, the electronic technology field has higher and higher requirements for power supply systems, especially some important electrical equipment such as communication equipment or some important devices in equipment such as memory, real-time clock and some important Alarm circuits, etc., are not allowed to stop working due to mains power outages or power failures. They are all equipped with a backup power supply, so that when the main power supply is abnormal or the power is cut off, the backup power supply can be switched quickly and automatically without interruption to ensure equipment and The above devices and circuits can work normally; if the power supply of the power supply system is suddenly interrupted, it is very easy to cause loss of important data,...

Claims

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Application Information

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IPC IPC(8): H02J9/06
CPCY02B70/30Y04S20/20
Inventor 王学民曹淑玉杭旭
Owner PHICOMM (SHANGHAI) CO LTD
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