A self-locking pwm wave generating circuit used in metering remote calibration device

Abstract

The invention discloses a self-locking PWM (pulse-width modulation) wave generation circuit for measuring a remote calibration apparatus. The self-locking PWM wave generation circuit comprises a control signal generation circuit, a pulse width control circuit and a self-locking PWM wave generation circuit body, the control signal generation circuit comprises an amplitude limiting circuit composed of a ZD1 and a ZD2 and an inversion differencing circuit composed of an R1, an R2, an R3, an R4, a C1 and a U1, the control signal generation circuit functions in processing signals VI and VF into an inversion signal VO1 with certain amplitude, the pulse width control circuit is composed of an R5, an R6, an R7 and a U2 and functions in matching the VO1 with a VR1 to generate a pulse width adjustable PWM control signal VO2, the self-locking PWM wave generation circuit body is composed of an upper bridge arm control circuit and a lower bridge arm control circuit, and input signals processed by the upper and lower bridge arm control circuits are identical while output signals are opposite and cannot be high at the same time, in other words, outputs VO5 and VO6 are used for controlling an IGBT (insulated gate bipolar translator) to work.

Description

technical field [0001] The invention relates to a PWM wave generating circuit, in particular to a self-locking PWM wave generating circuit used for a metering remote calibration device. Background technique [0002] With the development of science and technology and the progress of society, electric energy has been widely used in all walks of life as a clean, fast, and conveniently transported controllable energy. Due to the investment in rectification and frequency conversion equipment, it has brought great benefits to users. Convenience, but at the same time, it also causes pollution to the power grid. For this reason, the active power filter (APF) emerged as a modern harmonic control device, with its small size, continuously adjustable capacity, and fast compensation for harmonic tracking. , will become the mainstream equipment in the harmonic control industry. Among them, the IGBT control method of the active power filter (APF) has become the key technology for its devel...

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Problems solved by technology

[0003] For this reason, many scholars at home and abroad have proposed different methods of PWM wave control IGBT, such as using high-precision conversion chips, or DSP processing methods, etc., but this greatly increases the difficulty and cost of PWM wave control technology. Based on this, we A self-locking PWM wave generation circuit for active power filters is proposed, which has the advantages of simplicity, stability, low cost, and easy implementation

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