Power supply and power circuit thereof
A technology of power supply circuit and charging voltage, which is applied in the direction of high-efficiency power electronic conversion, electrical components, and adjustment of electric variables, and can solve the problems of low efficiency and stability of ACDC power supply system
Active Publication Date: 2019-07-09
BYD SEMICON CO LTD
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Problems solved by technology
[0007] The purpose of the present invention is to provide a power supply and its power supply circuit, aiming to solve the problems of low efficiency and stability in the existing ACDC power supply system
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[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0025] The realization of the present invention is described in detail below in conjunction with specific accompanying drawing:
[0026] Figure 4 The module structure of the power supply circuit provided by an embodiment of the present invention is shown. For the convenience of description, only the parts related to this embodiment are shown, and the details are as follows:
[0027] like Figure 4 As shown, the power supply circuit provided by the embodiment of the present invention is used to charge electric equipment, which includes a rectifier bridge 10, a transformer 20, a primary control ch...
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The invention belongs to the technical field of power supplies, and provides a power supply and a power circuit thereof. In the invention, a secondary control chip comprising a power supply biasing module, an opening detection module, a closing detection module, a control module, a driving module, an output voltage detection module and a threshold value processing module is arranged in the power circuit, so that when a secondary rectification switch tube performs secondary rectification on the output of a transformer, the control module is used for controlling the driving module to open the secondary rectification switch tube according to the detection result of the opening detection module; the control module is further used for controlling the driving module to close the secondary rectification switch tube according to the detection result of the closing detection module, so that the secondary rectification switch tube can be switched on and off; when the secondary rectification switch tube is closed, the threshold value processing module is used for adjusting the closing voltage threshold value of the closing detection module according to the detection result of the output voltage detection module, so that the secondary rectification switch tube achieves zero current turn-off, and therefore the efficiency and the stability of the power circuit are improved.
Description
technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to a power supply and a power supply circuit thereof. Background technique [0002] In order to solve the defect of low charging power of the traditional low-power AC-DC (ACDC) power supply, the prior art proposes an ACDC power supply system that increases the charging power and speed by increasing the output voltage, such as figure 1 The ACDC power supply system shown has an output voltage range up to 12V, or even greater. like figure 1 As shown, the ACDC power supply system is mainly composed of rectifier bridge, transformer primary winding, secondary winding, feedback winding, primary control IC, power switching device, primary current detection resistor R4, feedback rectifier diode D1, feedback voltage detection resistors R2 and R3 , secondary rectifier diode D2 and capacitors. In this ACDC power supply system, since the secondary of the transformer is rect...
Claims
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IPC IPC(8): H02M3/335H02M7/04
CPCH02M3/33576H02M7/04H02M1/0058Y02B70/10
Inventor 傅平王文情
Owner BYD SEMICON CO LTD