Transformer isolation amplifier having chopped wave pulse signal clamping

Abstract

The invention discloses a transformer isolation amplifier having chopped wave pulse signal clamping. The transformer isolation amplifier includes a power transformer and a signal isolation transformer, the power transformer provides a chopped wave pulse signal to control a chopper tube of the signal isolation transformer, a clamping circuit is arranged between the input end of the chopped wave pulse signal and the power transformer, and the clamping circuit enables high voltage of the input signal of the chopper tube to be larger than break-over voltage of the chopper tube and enables low voltage of the input signal of the chopper tube to be smaller than pinch-off voltage of the chopper tube. The transformer isolation amplifier utilizes clamping circuit to clamp the top or bottom of the chopped wave pulse signal of the signal isolation transformer, thereby enabling reliable turning-off and turning-on of the chopper tube of the signal isolation transformer, and improving accuracy of measurement.

Description

technical field [0001] The invention relates to the field of transformer coupling isolation amplifiers, in particular to a transformer isolation amplifier with chopper pulse signal clamping. Background technique [0002] A transformer-coupled isolation amplifier consists of two parts, a power transformer and a signal isolation transformer. In addition to providing the power required by the isolation amplifier, the power transformer also provides the required chopping modulation and demodulation signal to control the N or P channel FET switch to complete modulation and demodulation. The main function of the signal isolation transformer is to transmit the signal after chopping modulation, and play the role of coupling and isolation. [0003] The existing transformer-coupled isolation amplifier chopper modulation / demodulation circuit such as figure 1 As shown, the square wave generated by the power supply / square wave oscillator is coupled by the transformer to control the on-...

AI Technical Summary

Problems solved by technology

In many years of work, the inventor has conducted research on the inaccurate measurement results of existing transformer isolation amplifiers in interference environments, and found that one of the reasons for this problem is that the chopper tube cannot be effectively turned off and turned on due to signal interference

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