Low frequency large current pulse suppression circuit with isolation

Abstract

A low frequency large current pulse suppression circuit with isolation comprises a constant flow source, an energy storage supply circuit, a voltage sampling circuit, a current sampling circuit, an error amplifier, a comparator and an isolation driving circuit. A positive end of an external power supply is connected with an input end of the constant flow source, an output end of the constant flow source is connected with one end of the energy storage supply circuit, the other end of the energy storage supply circuit is connected with a negative end of the power supply, and equipment working in a pulse state is in parallel connection with the energy storage supply circuit. The voltage sampling circuit collects the voltage of the energy storage supply circuit, the error amplifier enables the voltage of the energy storage supply circuit to be compared with a preset reference voltage and outputs an error voltage to a first input end of the comparator, the current sampling circuit collects the input current of the constant flow source and converts the current to the voltage to send the voltage to a second input end of the comparator, the comparator outputs pulse width modulation control signals after voltage compare, and control for the size of the input current of the constant flow source is achieved after the control signals pass through the isolation driving circuit to be amplified.

Description

technical field [0001] The invention relates to a pulse suppression circuit. Background technique [0002] In application systems such as radar and electronic countermeasures, the equipment usually works in a pulse state, and the pulse output power is relatively large (up to KW level), resulting in a pulse current with a large change in frequency at the input of the equipment. When the pulse current frequency When it is low (such as KHz level), the internal LC filter of the equipment will fail, and the pulse current will be directly transmitted to the primary power supply to pollute the power supply network, affecting the normal operation of other equipment on the primary side. [0003] At present, the suppression of pulse current signals mainly adopts the method of connecting two stages of LC filters in series. The main problem of this method is: when the frequency of pulse current is very low (such as 180Hz), the volume and weight of the LC filter will change. It is very ...

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Problems solved by technology

[0002] In application systems such as radar and electronic countermeasures, the equipment usually works in a pulse state, and the pulse output power is relatively large (up to KW level), resulting in a pulse current with a large change in frequency at the input of the equipment. When the pulse current frequency When it is low (such as KHz level), the internal LC filter of the equipment will fail, and the pulse current will be directly transmitted to the primary power supply to pollute the power supply network, affecting the normal operation of other equipment on the primary side

[0003] At present, the suppression of pulse current signals mainly adopts the method of connecting two stages of LC filters in series. The main problem of this method is: when the frequency of pulse current is very low (such as 180Hz), the volume and weight of the LC filter will change. It is very large, even dozens of times more than the equipment itself, causing the volume and weight of the equipment to seriously exceed the standard

At this time, the volume of the filter will be very large, reaching 310mmx206mmx75mm, 3.5Kg, which will be unacceptable in engineering

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