Protection device and method for switching power supply, and switching power supply
A switching power supply and protection device technology, applied in the field of power supply, can solve problems such as inability to effectively extinguish arcs
Active Publication Date: 2018-09-21
HUAWEI DIGITAL POWER TECH CO LTD
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Problems solved by technology
[0005] In order to solve the problem that the traditional arc extinguishing device cannot effectively extinguish the arc when faced with an arc exceeding a certain current intensity, the embodiment of the present invention provides a protection device and method for a switching power supply, and a switching power supply
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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0036] In order to facilitate the understanding of the embodiments of the present invention, the structure of the switching power supply is briefly introduced below. The switching power supply generally includes a power circuit and a control circuit. The most important device in the power circuit is the power switch tube. The control circuit controls the time ratio of the power switch tube to be turned on and off by outputting a pulse width modulation signal (Pulse Width Modulation, PWM) ( duty cycle) to maintain a regulated output voltage.
[0037] figure 1 A protection device for a switching power supply provided by an embodiment of the present invention is shown, such as figure 1 As shown, the switching power supply includes a rel...
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The invention discloses a protection device and method of a switching power supply and the switching power supply, belonging to the field of a power supply. The protection device comprises a voltage detection module, a current detection module and a control module, wherein the voltage detection module is used for detecting a voltage value between contacts of a relay switch, the relay switch is connected between a power supply and a power circuit of the switching power supply, the current detection module is used for detecting a current value flowing through the switch, and the control module is used for judging whether an arc is generated between the contacts of the switch or not and controlling the switching power supply to stop working when the arc is judged to be generated between contacts. Whether the arc is generated between the contacts of the switch is judged according to the voltage value between the contacts of the switch and the current value flowing through the switch; the switching power supply is controlled to stop working when the arc is judged to be generated between the contacts of the switch, and the current in the relay switch is reduced; and when the current is reduced to a certain extent, the arc can be extinguished. Since the arc is extinguished by reducing the current flowing through the switch, the arc can be enabled to be finally extinguished no matter how large the current during arc generation.
Description
technical field [0001] The invention relates to the field of power supplies, in particular to a protection device and method for a switching power supply, and a switching power supply. Background technique [0002] Switching power supply is a power supply that uses modern power electronics technology to maintain a stable output voltage by controlling the time ratio (duty cycle) of the power switch tube being turned on and off. Switching power supply is characterized by small size, light weight and high efficiency. Widely used in various electronic equipment, it is an indispensable power supply for the rapid development of today's electronic information industry. [0003] There is an existing switching power supply, the input end of which is provided with a relay, and when the switch of the relay is turned on, the switching power supply can work normally. During the working process of the switching power supply, if the switch of the relay is disconnected, an arc phenomenon o...
Claims
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IPC IPC(8): H02H7/12H02H5/04
CPCH02H5/041H02H7/1203
Inventor 甘健宏
Owner HUAWEI DIGITAL POWER TECH CO LTD