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Pulse width modulation control system

A technology of pulse width modulation and control system, applied in the direction of control system, general control system, control/regulation system, etc., can solve problems such as the impossibility of precise control of inverters and converters without considering the limiting wave type

Inactive Publication Date: 2004-07-07
LG IND SYST CO LTD
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  • Claims
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Problems solved by technology

[0011] However, precise control of inverters and converters is impossible because a positive signal always outputs an ON signal regardless of the shape of the clipped wave and a negative signal always outputs an OFF signal

Method used

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Embodiment Construction

[0028] Fig. 4 is the circuit diagram of the present invention, and it comprises: Up-counter 101 and down-counter 100, generate clipping wave after setting different counter initial voltage values, thereby obtain the clipping wave by its maximum reference voltage value and minimum reference voltage value The clock selection unit 600 that provides the clock to the up counter 101 and the down counter 100; the adder 301 that sequentially adds the voltage value counted on the up counter 101; the subtractor 300 that sequentially subtracts the voltage value counted on the down counter 100 ; Automatically generate two different reference voltage values ​​(V ref ), (V DTref ) of the reference voltage value generation unit 400; respectively compare two different reference voltage values ​​(V ref ), (V DTref ) and the comparator 201 of the voltage value output by the adder 301 and the subtractor 300; output PWM (pulse width modulation) positive signal (S PWM+ ) and PWM (Pulse Width Mo...

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Abstract

The present invention relates to a pulse width modulation control system, comprises a counter which sets initial voltage value differently and outputs chopping wave crossed at its maximum voltage value and minimum voltage value, an adder / subtracter which adds / subtracts signal generated by the counter, a reference voltage value generation unit which is inputted signal outputted from the adder / subtracter and outputs two different reference voltage values to single chopping wave, a comparator which compares reference voltage value generated by the reference voltage value generation unit with voltage value outputted from the adder / subtracter, and an output control unit which outputs PWM (Pulse Width Modulation) positive signal (SPWM+).

Description

technical field [0001] The present invention relates to a pulse width modulation control system, in particular to a pulse width modulation control system capable of preventing arm short phenomenon by setting two reference voltage values ​​and their update start points as the start points of an up / down counter Ensure dead time in PWM control to perform precise control of 3-phase inverters and converters. Background technique [0002] Pulse Width Modulation is a method of changing the pulse width according to the amplitude of the signal wave. Specifically, sine wave pulse width modulation is a method of sequentially changing the width of an output pulse to obtain a motor current similar to a sine wave, and the torque ripple of the motor is small in a low frequency range, so this method has been widely used in recent years. [0003] A conventional pulse width modulation control system includes an up / down counter that outputs a clipped wave (carrier signal), a comparator that c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B15/00H02M1/00H02M1/38
CPCH02M1/38G05B15/00
Inventor 裴圭晟
Owner LG IND SYST CO LTD
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