Anti-surge current control circuit and switching power supply
A current control circuit and control circuit technology, which are applied to emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve the problems of high cost and complicated control circuits, and achieve circuit The effect of simplicity and reduced circuit cost
Pending Publication Date: 2022-03-25
SHENZHEN HONOR ELECTRONICS
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Problems solved by technology
[0004] Aiming at the problem of high cost due to the complexity of the control circuit of the relay in the switching power supply, the embodiment of the present application provides an anti-surge current control circuit, which can at least partly solve the above problem
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[0044]In order to make the purpose, technical solutions, and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the application and their descriptions are used to explain the application, but not to limit the application. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.
[0045] figure 1 is a schematic structural diagram of the anti-surge current control circuit provided in the first embodiment of the present application, as shown in figure 1 As shown, the anti-surge current control circuit provided by the embodiment of the present application includes a first capacitor C1, a current limiting resistor P, a relay, a first control circuit 1 and a second control circuit 2, w...
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The invention provides an anti-surge current control circuit and a switching power supply, the anti-surge current control circuit comprises a first capacitor, a current-limiting resistor, a relay, a first control circuit and a second control circuit, a first end of the first capacitor is connected with an input end, a second end of the first capacitor is connected with a first end of the current-limiting resistor, and a second end of the first control circuit is connected with a second end of the current-limiting resistor. The second end of the current-limiting resistor is connected with the output end; the relay comprises a contact switch and a trigger coil, the contact switch is connected with the current-limiting resistor in parallel, the first end of the trigger coil is connected with the output end, the second end of the trigger coil is connected with the first control circuit, the first control circuit is connected with the input end, and the second control circuit is connected with the output end. And the second control circuit is respectively connected with the first control circuit, the output end and the first end of the current-limiting resistor. According to the anti-surge current control circuit and the switching power supply provided by the invention, the circuit cost is reduced.
Description
technical field [0001] The present application relates to the technical field of electronic circuits, in particular to an anti-surge current control circuit and a switching power supply. Background technique [0002] There is generally a large capacitance inside the switching power supply, and a large transient surge current will be generated at the moment when the power-on input voltage is connected. The inrush current may exceed the power supply capacity of the power supply equipment, resulting in protection or even damage to the power supply equipment. At the same time, it may also damage the fuses, capacitors and other components inside the power supply, resulting in the failure of the power supply to work normally. [0003] In order to solve the problem of excessive surge current in the switching power supply, the current mainstream method is to connect the power resistor in parallel with the relay and then connect it in series between the power supply input and the int...
Claims
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Login to View More IPC IPC(8): H02M1/32H02H9/02H02H9/00
CPCH02M1/32H02H9/026H02H9/005
Inventor 汪锟王越天
Owner SHENZHEN HONOR ELECTRONICS