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Improved structure of pulse width modulation controller

A pulse width modulation, controller technology, applied in the direction of pulse duration/width modulation, etc., can solve the problems of unstable pulse width modulation output voltage, excessive ripple, etc., to achieve stable output voltage, increased response speed, and increased compensation The effect of stability

Active Publication Date: 2012-07-18
DIODES TAIWAN S A R L
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  • Description
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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of pulse width modulation (PWM) output voltage instability and excessive ripple in the prior art

Method used

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  • Improved structure of pulse width modulation controller

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Embodiment Construction

[0021] An improved structure of a pulse width modulation controller of the present invention, during its implementation:

[0022] see Figure 4 As shown, it is a functional block diagram of the present invention, an improved pulse width modulation controller, which includes:

[0023] A PWM generation module 1, the PWM (Pulse Width Modulation) of this PWM generation module 1 is called pulse width modulation, and its input end is connected with an oscillator 13 and the output end of this auxiliary control circuit module 20, is used for power supply voltage stabilization control and DC to AC sine wave control;

[0024] A voltage feedback module 10, the voltage feedback module 10 includes: an amplifying circuit 11 and a feedback control circuit 12; the input end of the amplifying circuit 11 is connected to the feedback node 31, and the output of the auxiliary control circuit module 20 is controlled by the amplifying circuit 11 , and the receiving end of the feedback control circ...

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Abstract

The invention discloses an improved structure of a pulse width modulation controller, which comprises a PWM generating module, a voltage feedback module and an auxiliary control circuit module, wherein the input end of the PWM generating module is connected with an oscillator and the output end of the auxiliary control circuit module; the voltage feedback module comprises an amplifying circuit and a feedback control circuit; the receiving end of the feedback control circuit is connected with a load end, while the output end is connected with a feedback node and the auxiliary control circuit module; the input end of the auxiliary control circuit module receives the signals from the voltage feedback module and an input power supply and the signals are processed by the auxiliary control circuit module and then output to the load end to improve the stability and the reaction speed of the system; when the difference between a feedback voltage and the input of a power supply is small, the output gain value of the auxiliary control circuit module is small, so the compensation stability is improved to make the output voltage stable; and when the different between the feedback voltage and the input of the power supply is large, the output gain value of the auxiliary control circuit module is large, and thus, the reaction speed fed back is improved to make the output voltage stable.

Description

technical field [0001] The invention relates to an improved structure of a pulse width modulation controller, which uses multiple amplifiers to increase the stability of the circuit. When the feedback range (REF-FB) is small, the amplification rate is small to increase the compensation stability. When the feedback range (REF-FB) is small, the compensation stability is increased. When REF-FB) is large, the amplification rate is large and the feedback speed is increased. Background technique [0002] see figure 1 , which is a functional block diagram of a conventional pulse width modulation (PWM) controller. In the figure, a single loop is used as the control feedback, and the control signal and the feedback signal are both voltages, that is, the voltage feedback path; and figure 2 is a circuit diagram of a conventional pulse width modulation (PWM) controller, which corresponds to figure 1 block diagram from figure 2 It can be clearly seen that a single amplifier is conne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K7/08
Inventor 李明辉纪全鸿
Owner DIODES TAIWAN S A R L
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