Control method for combination power supply of boost and bridge type DC-DC
First Claim
1. A Pulse Frequency and Width Modulation (PFWM) control method for a combination power supply of a boost converter and a bridge type DC-DC converter, which also includes BUCK, the control method comprising:
- sensing the DC-DC converter'"'"'s output voltage, current or power, to obtain a frequency of a Pulse Frequency Modulation (PFM) chopping signal for driving switching components according to an automatic feedback and control theory;
sensing an instant input voltage and a boost output voltage, to obtain a maximum duty to prevent a boost inductor from saturation caused by an insufficient magnetic reset;
predetermining an operating duty which is limited by the obtained maximum duty;
combining the obtained PFM frequency and the operating duty into at least a pair of complementary PFWM driving signals, directly, indirectly or after modification to drive at least a first switching component and a second switching component of the bridge type DC-DC converter, adjusting an output of the boost converter so as to control a DC-DC output.
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Abstract
A PFWM control method for a combination power supply of the boost converter and the bridge type DC-DC converter which also includes BUCK. A method of using the PFWM to control both boost and DC-DC converters simultaneously. A monitor module senses the bridge type DC-DC converter'"'"'s output voltage, current or power, to obtain the frequency of PFM for driving switching components; predetermined a duty by design and use a frequency to adjust the boost output so as to adjust the DC-DC output voltage, current or power. Another monitor module senses the input instant voltage and the boost output voltage to obtain a maximum duty which is used to prevent the boost inductor from saturation. Combine above frequency and duty into at least a pair of complement PFWM driving signals, to directly or indirectly drive the combination power supply of boost converter and bridge type DC-DC converter'"'"'s switching components.
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Citations
7 Claims
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1. A Pulse Frequency and Width Modulation (PFWM) control method for a combination power supply of a boost converter and a bridge type DC-DC converter, which also includes BUCK, the control method comprising:
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sensing the DC-DC converter'"'"'s output voltage, current or power, to obtain a frequency of a Pulse Frequency Modulation (PFM) chopping signal for driving switching components according to an automatic feedback and control theory; sensing an instant input voltage and a boost output voltage, to obtain a maximum duty to prevent a boost inductor from saturation caused by an insufficient magnetic reset; predetermining an operating duty which is limited by the obtained maximum duty; combining the obtained PFM frequency and the operating duty into at least a pair of complementary PFWM driving signals, directly, indirectly or after modification to drive at least a first switching component and a second switching component of the bridge type DC-DC converter, adjusting an output of the boost converter so as to control a DC-DC output. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification