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Pulse modulation processing circuit

A processing circuit and pulse modulation technology, applied in the field of pulse modulation processing circuits, can solve the problems of non-compliance of output voltage, design requirements and uncontrollable gain, and achieve the effect of realizing linear relationship

Inactive Publication Date: 2016-10-26
CHENGDU ZHIRENSHANYONG INFORMATION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the above prior art, the purpose of the present invention is to provide a pulse modulation processing circuit, which aims to solve the technical problems in the prior art such as the output voltage does not meet the design requirements and the gain is uncontrollable due to the unreasonable setting of the overshoot suppression circuit.

Method used

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Embodiment 1

[0022] Such as figure 1 , the reference voltage nodes V1-V4 can be powered by a DC voltage source or a microcontroller voltage output terminal, the overshoot signal is introduced through the input voltage signal Vin, and the working state of the depletion type field effect transistor Q2 is a non-modulation state, That is, the input voltage signal is directly equal to the output voltage signal Vout; for the reference voltage node V2, it is necessary to keep the difference between the input voltage signal and the positive voltage of the reference voltage node V2 higher than the voltage value of the modulation drive signal; when the voltage value of the reference voltage node V3 is higher than Modulate the voltage value of the driving signal or when the comparator U6 outputs a high level, and when an overshoot signal is detected at the non-inverting input terminal of the operational amplifier U2, the NAND gate U3A makes the field effect transistor Q1 cut off, and the operational a...

Embodiment 2

[0025] refer to Figure 4 Describe in detail. Specifically, the charging and discharging circuit 11 includes inverters U8, U9 and U10, a switching transistor Q5, a capacitor C2, a switching transistor Q4 and a power supply VDD. The inverter group receives the initial signal 20 and generates an inverted signal. Each switch triode uses the received inverted signal as a control signal to control the disconnection or conduction between the other two ports, and use it in the PWM circuit 11 . Specifically, when the inverted signal is digital 0, the switch transistor Q5 is turned on, so that the power supply VDD charges the capacitor C2, so that the voltage at the port of the capacitor C2 increases linearly. When the signal is digital 1 after phase inversion, the switching transistor Q5 is turned off, and the switching transistor Q4 is turned on. Therefore, the capacitor C2 is discharged through the switching transistor Q4 , and the voltage at one end of the capacitor C2 connected ...

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Abstract

The present invention relates to the field of circuit design, and aims to solve technical problems of overshoot output voltage or overhigh negative gain and uncontrollable gain due to unreasonable arrangement of an overshoot suppression circuit. The present invention relates to a pulse modulation processing circuit. The pulse modulation processing circuit mainly comprises a linear compensation drive circuit for receiving an input voltage signal, a first operational amplifier for outputting voltage signal truncation, receiving a feedback signal output by the linear compensation drive circuit and outputting a modulation drive signal to the linear compensation drive circuit, a voltage detection circuit for receiving the modulation drive signal output by the first operational amplifier, and an overshoot detection circuit for receiving the feedback signal output by the linear compensation drive circuit and a detection signal output by the voltage detection circuit. The pulse modulation processing circuit is used for voltage modulation.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to a pulse modulation processing circuit. Background technique [0002] In the existing technology, the automatic control part and the motor part use the same AC power supply, introduce more unstable loads and a large number of system electromagnetic noise and overshoot signals, etc. unconventional situations; therefore, the introduction of high-efficiency and reasonable voltage modulation device is very necessary. For a voltage modulator with overshoot suppression, such as a modulator with a Zener diode, since the output is limited by the non-differential chopping method, it suppresses the input signal gain and is not suitable for the feedback detection of the control chip; The modulator with the structure of operational amplifier and field effect tube, when the input signal is a negative signal source, there is unnecessary overshoot suppression, resulting in the output voltage being...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K7/08
CPCH03K7/08
Inventor 张凯胜刘华吴小莉
Owner CHENGDU ZHIRENSHANYONG INFORMATION TECH CO LTD
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