Zero-current switch control circuit

Abstract

The invention discloses a zero-current controllable switch control circuit which is characterized by comprising a direct-current power supply, an inductor, a first controllable switch, a second controllable switch, an energy storage capacitor, a comparator, a first D trigger, a second D trigger, a phase inverter, a two-input AND gate and a load resistor, wherein the first controllable switch is switched on when a control end is at a high level, and the second controllable switch is switched on when the control end is at the high level. The circuit has the advantages that the controllable switch is used for replacing a fly-wheel diode in a traditional converter, the equivalent impedance of an inductor discharge loop is effectively reduced, the conversion efficiency of the converter is improved, the zero-current switch control technology detects the voltage of the positive discharge end and the output end of the inductor, the controllable switch is switched off when the discharge current of the inductor is reduced to zero, and energy backflow at the output end is prevented. Compared with a traditional freewheeling diode, the conduction impedance of the controllable switch is much smaller, the power consumption of the whole circuit is reduced, and the energy conversion efficiency is improved.

Description

technical field [0001] The invention relates to a controllable switch DC step-up circuit structure, in particular to a zero-current switch control circuit. Background technique [0002] At present, DC-DC converters are widely used in various fields such as photovoltaic energy harvesting, electric vehicles, household appliances, mobile electronic devices, and Internet of Things nodes. The traditional DC-DC converter mainly includes modules such as switches, inductors, diodes, and corresponding switch control circuits. First, a circuit for charging the inductor is formed by controlling the switch. When the inductor current rises to a certain value, the switch is reconfigured again. Form a circuit in which the inductor discharges to the load; in the traditional converter, in the inductor discharge stage, in order to prevent the load from pouring energy into the inductor after the inductor energy is released, a diode is generally connected in series between the inductor and the ...

AI Technical Summary

Problems solved by technology

The traditional DC-DC converter mainly includes modules such as switches, inductors, diodes, and corresponding switch control circuits. First, a circuit for charging the inductor is formed by controlling the switch. When the inductor current rises to a certain value, the switch is reconfigured again. Form a loop in which the inductor discharges to the load; in the traditional converter, in the inductor discharge stage, in order to prevent the load from pouring energy into the inductor after the inductor energy is released, a diode is generally connected in series between the inductor and the load to prevent the load energy from leaking. However, the equivalent impedance of the diode is relatively large, which will consume part of the energy during the discharge phase of the inductor, which seriously limits the conversion efficiency of the DC-DC converter.

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