Design method for DC-DC power ripple rejection
A DC-DC, power ripple technology, applied in electrical components, output power conversion devices, etc., can solve the problems of low frequency ripple residue, increased filter capacitor capacity, etc., achieving strong practicability, strong safety, and easy promotion. Effect
Active Publication Date: 2015-09-23
SHANDONG CHAOYUE DATA CONTROL ELECTRONICS CO LTD
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Problems solved by technology
[0003] (1) The low-frequency ripple is related to the filter capacitor capacity of the input and output circuits, and the capacity of the filter capacitor cannot be increased without limit, resulting in the residual of the output low-frequency ripple;
[0004] (2) High-frequency noise ripples generated by high-frequency power switching conversion circuits, capacitor inductance charging and discharging processes, etc.;
[0005] (3) Common mode noise caused by the existence of parasitic parameters
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[0023] A design method for DC-DC power supply ripple suppression provided by the present invention will be described in detail below in conjunction with the accompanying drawings.
[0024] The present invention proposes a design method for DC-DC power supply ripple suppression, as shown in the attached figure 1 As shown, the method is implemented through the following steps:
[0025] Set the primary side circuit at the input end and the secondary side circuit at the output end, and filter circuits are set on the primary side circuit and the secondary side circuit to suppress low-frequency ripple;
[0026] An isolation circuit is arranged between the primary side circuit and the secondary side circuit to filter out high-frequency ripples between the two filter circuits.
[0027] The primary side circuit includes an LC low-pass filter circuit arranged at the voltage input end to suppress low-frequency ripple; the secondary side circuit includes an active low-pass filter circuit...
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The invention provides a design method for DC-DC power ripple rejection. The realization process of the design method is as follows: setting a primary side circuit of an input end and a secondary side circuit of an output end, wherein filter circuits are arranged on the primary side circuit and the secondary side circuit, and restraining a low-frequency ripple wave; arranging an isolating circuit between the primary side circuit and the secondary side circuit, and filtering a high-frequency ripple wave between two filter circuits out. Compared with prior art, the design method for DC-DC power ripple rejection comprehensively considers the input process, output process and ground process of a DC-DC power supply, realizes active suppression of direct-current power ripple. The design method of the invention is strong in safety, low in energy consumption, strong in practicability, and easy for popularizing.
Description
technical field [0001] The invention relates to the technical field of computer power supplies, in particular to a design method for DC-DC power supply ripple suppression. Background technique [0002] The only indispensable thing for electronic products is the power supply, but in addition to providing energy, it also brings ripples, noise and other effects that affect the normal operation of electronic products. Ripple voltage will have an impact on high amplifier, local oscillator, frequency mixing, filtering, detection, A / D conversion and other circuits. At present, switching power supply has been widely used in computers, communications and other equipment due to its advantages of small size and high efficiency. Meet the design requirements. The output ripple of switching power supply mainly comes from the following aspects: [0003] (1) The low-frequency ripple is related to the filter capacitor capacity of the input and output circuits, and the capacity of the filt...
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IPC IPC(8): H02M1/14
Inventor 谭琳耿士华陈乃阔
Owner SHANDONG CHAOYUE DATA CONTROL ELECTRONICS CO LTD