A method for improving the ccm mode conversion efficiency of flyback resonant switching power supply
A switching power supply and mode conversion technology, which is used in high-efficiency power electronic conversion, output power conversion devices, conversion of DC power input to DC power output, etc.
Active Publication Date: 2020-10-20
SOUTHEAST UNIV +1
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Problems solved by technology
As the operating frequency of switching power supplies continues to rise, switching losses due to the increase in switching frequency have gradually become a serious problem
Method used
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[0035] The control system for improving the conversion efficiency of the flyback resonant switching power supply in the CCM mode of the present invention is as follows: figure 1 and Figure 7 , based on a control system composed of a current detection module, a state detection module, an output feedback module, a PWM module and a drive module, the control system is connected with a controlled switching power supply to form a closed loop.
[0036] like figure 2 As shown, the current detection module is composed of a comparator COMP1 and a D flip-flop D1. The positive terminal of the comparator COMP1 is connected to the primary sampling resistor voltage Vs, the negative terminal is connected to the ground, and the output is VCOMP1. When the primary current IL changes from a positive value to When it becomes a negative value, the comparator output VCOMP1 will change from 1 to 0; the input signal D of D flip-flop D1 is VCOMP1, the input clock signal CLK is the working clock CK o...
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A control method for improving the conversion efficiency of a flyback resonant switching power supply in CCM mode, based on a soft-switching flyback resonant circuit control system, including a current detection module, a state detection module, an output feedback module, a PWM module, and a drive module. The system is connected with the controlled switching power supply to form a closed loop. The control system is based on the ONOFF control method and controls the switching power supply in the soft start state or the ONOFF state. The current detection module and the output feedback module collect the basic parameters of the constant voltage algorithm. The state detection module is used to detect the working state of the circuit: soft start state and ONOFF state. The PWM module modulates the switch control signal duty based on two different working states. An appropriate duty cycle is output through the drive module, thereby improving the efficiency of the switching power supply.
Description
technical field [0001] The invention relates to the field of switching power supplies, in particular to a control method for improving the conversion efficiency of a flyback quasi-resonant switching power supply CCM (continuous current mode) mode. Background technique [0002] Switching power supply has been developing in the direction of miniaturization, high frequency, modularization and light weight. As the operating frequency of switching power supplies continues to rise, the switching loss caused by the increase in switching frequency has gradually become a serious problem. Therefore, in the design of the switching power supply, it is necessary to carefully analyze and deal with the switching loss problem. [0003] In the resonant soft switching circuit, ideally, the switching device can switch under the condition of zero voltage or zero current, and the switching loss is zero. Therefore, under the condition of using the same type of switching device, the operating fr...
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IPC IPC(8): H02M1/00H02M3/335
CPCH02M3/33523H02M1/0003H02M1/0009H02M1/0058Y02B70/10H03K5/24H02M3/33576H02M1/0025H02M3/33515H02M3/33592
Inventor 孙伟锋陶蓉蓉王浩肖金玉苏巍徐申时龙兴
Owner SOUTHEAST UNIV