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PWM pulse controller

A technology of pulse controller and controller, which is applied in the direction of pulse duration/width modulation, general control system, control/regulation system, etc., and can solve problems such as complex circuits and algorithms, high cost, and poor performance

Inactive Publication Date: 2009-03-18
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The PWM controller in digital form is usually realized by a single-chip microcomputer system, and an analog-to-digital conversion interface is required for signal transmission with external equipment. Its circuits and algorithms are relatively complicated and the cost is relatively high. more sensitive
[0005] The PWM controller in the analog form is usually composed of a PI (or PID) regulator (or a regulator with similar functions), a PWM pulse generator composed of a triangular wave generator, and an analog operation circuit. Simpler, the electromagnetic interference of electric drive equipment has relatively little impact on its reliability, and the cost is relatively low, but the structure of ordinary PWM controllers is still too complicated, and the performance is relatively poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] PWM waveform generator

[0070] The schematic diagram of the structure of the PWM waveform generator is as follows: Figure 20 shown.

[0071] The PWM waveform generator is composed of a PWM pulse controller, an RC filter, and an output buffer unit. The PWM waveform generator inputs a given signal, and outputs a PWM pulse signal through the PWM controller together with the feedback variable input. The PWM pulse signal passes through the RC The filter output is a pulsating DC voltage feedback variable.

[0072] Suppose: the pulse width difference ratio of the pulse signal waveform (abbreviation: difference ratio) Q is the positive pulse width T 2 with negative pulse width T 1 The difference (T 2 -T 1 ) and the whole period (T 2 +T 1 )Ratio.

[0073] which is:

[0074] Q = T 2 - T 1 T ...

Embodiment 2

[0082] PWM switching power supply

[0083] The schematic diagram of the structure of the PWM switching power supply is as follows: Figure 22 shown.

[0084]The PWM switching power supply is composed of a variable resistor R0, a PWM pulse controller P1, an inverting high-power driver P2, and an LC filter. The PWM switching power supply inputs a given voltage signal from the variable resistor R0, and outputs a PWM pulse signal through the PWM controller P1 together with the feedback variable input. The PWM pulse signal is amplified by the power of the high-power driver P2 and output smoothly by the waveform of the LC filter. A pulsating DC voltage waveform, and the output divided by the resistors R1 and R2 is connected to the input terminal of the PWM controller P1 as a feedback variable.

[0085] The working waveform of PWM switching power supply is as follows: Figure 23 shown.

[0086] Selecting the proper oscillation frequency of the PWM output pulse signal and the para...

Embodiment 3

[0090] Class D Audio Power Amplifier

[0091] The schematic diagram of the class D audio power amplifier structure is as follows: Figure 24 shown.

[0092] Class D audio power amplifier is composed of PWM pulse controller, LC filter and so on. The class D audio power amplifier inputs an audio voltage signal, and the feedback variable is input to the PWM controller through the resistors R1 and R2 respectively, and the PWM controller outputs a PWM pulse signal, and the PWM pulse signal is smoothed by the waveform of the LC filter to output a power audio voltage. Push the speaker to produce sound. PWM pulse signal waveform such as Figure 25 shown.

[0093] Due to the effect of resistors R1 and R2, the output voltage of this class D audio power amplifier is proportional to the input audio signal, and its output voltage U o with input voltage U i The relationship between is:

[0094] U o = - R...

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Abstract

The invention relates to a pulse controller with six PWM (pulse width modulation), which belongs to the technical field of power electronics and automatic control. The PWM pulse controller is composed of a voltage comparator, an inertia link or an integrating link, a hysteresis comparator and the like. The PWM controller, a control object, feedback transformation and the like form a PWM pulse control system, the controlled variable of the control object outputs feedback variable through a feedback transformation link and outputs a pulse signal with control giving through the comparator, a triangle waveform signal is generated through the inertia link or the integrating link, and a PWM pulse control signal is generated through the hysteresis comparator and is acted on the control object to adjust the output variable. When conditions are changed or output pulse acts continuously to enable the feedback variable to deviate from a given target, the PWM controller outputs a pulse control signal, which enables the output of the control object to trace the given target. The PWM controller has simple and reliable structure, low cost, rapid system response, high efficiency and wide application value.

Description

technical field [0001] The invention relates to six kinds of PWM (pulse width modulation) pulse controllers, referred to as PWM controllers or pulse controllers, and belongs to the technical field of power electronic equipment and automatic control. Background technique [0002] The proportion of power electronic equipment in various products such as production equipment, power transmission, electric transmission, automotive electronics, and electronic consumer goods is increasing day by day, and its role in production practice and human life is becoming increasingly important. However, due to the heat dissipation of power electronic devices Due to the limitation of capacity and the need for energy saving of high-power electric equipment, the high-efficiency electric drive device controlled by PWM has been paid more and more attention. [0003] PWM pulse controller mainly has two forms of digital circuit and analog circuit. [0004] The PWM controller in digital form is usu...

Claims

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Application Information

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IPC IPC(8): H02M1/00H02M1/08H03F3/217H03K7/08G05B6/02
CPCY02E10/56
Inventor 朱明司霞张金龙梅卫东
Owner SHANGHAI UNIV
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