Circuit for converting PWM output mode into PFM output mode
An output mode and circuit technology, applied in the direction of pulse conversion, electrical components, pulse technology, etc., can solve problems such as high cost, instability, and low cost performance of the system, and achieve better cost performance, performance improvement, and cost reduction.
Inactive Publication Date: 2011-08-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
In the variable frequency power supply system, the frequency conversion control chip is the core component and the heart of the control circuit system. It is directly related to the dynamic performance and steady state performance of the control circuit and affects the working performance of the circuit. Not widely used, there are some instability and other problems, the cost of the entire control circuit system is high, and the cost performance of the system is low
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[0019] Below in conjunction with accompanying drawing, technical scheme of the present invention is further illustrated:
[0020] Such as figure 1 and figure 2 As shown, the present invention is a schematic circuit diagram of converting the PWM output mode into the PFM output mode. A PWM output mode circuit is mainly composed of a PWM comparator 110 , an oscillator 120 generating a sawtooth wave, and a logic gate circuit 140 . The circuit that converts the PWM output mode into the PFM output mode includes a PWM comparator 110, an oscillator 120, a variable frequency clock pulse generation circuit 130 composed of a comparator 131 and a clock pulse generation circuit 132, and the clock pulse generation circuit 132 passes A NOT gate 133 , a capacitor 134 and a Schmitt trigger 135 are serially connected in series, and a logic gate circuit 140 is formed. Input voltage signal u i The non-inverting input terminal of the PWM comparator 110 is connected, the output terminal of the...
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The invention discloses a circuit for converting a PWM output mode into a PFM output mode and belongs to a power supply control circuit. The circuit consists of a PWM comparator, an oscillator circuit, a variable frequency clock pulse generating circuit consisting of a comparator and a clock pulse generating circuit and a logic gate circuit. An input voltage signal is crossed and compared with a sawtooth wave to generate a PWM pulse, and meanwhile, the input voltage signal and the clock pulse generating circuit generate a clock pulse at the tail end of the PWM pulse through the comparator; the clock pulse resets an oscillator and participates in the logic operation of the logic gate circuit, thereby outputting a pulse with a certain frequency, which has the duty ratio tending to 1 after adead zone is removed or the duty ratio tending to 0.5 after a pair of complementary dead zones is removed; and the frequency of the pulse and the input voltage change proportionally, thereby the PWM output mode is converted into the PFM output mode.
Description
technical field [0001] The invention relates to a frequency conversion type control circuit system, in particular to a frequency conversion type power supply control circuit system. Background technique [0002] The frequency conversion technology is more and more widely used, especially in the power control system. The frequency conversion technology has the advantages of energy saving, long service life, low interference, strong anti-interference ability and environmental protection. In the variable frequency power supply system, the frequency conversion control chip is the core component and the heart of the control circuit system. It is directly related to the dynamic performance and steady state performance of the control circuit and affects the working performance of the circuit. It is not widely used, and there are some problems such as instability. The cost of the entire control circuit system is high, and the cost performance of the system is low. The PWM (Pulse Wi...
Claims
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IPC IPC(8): H03K11/00
Inventor 李大伟邓翔杨善水
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS