Output current monitoring device for voltage reduction type conversion circuit

Abstract

An output current monitoring device for a voltage reduction type conversion circuit comprises a voltage input end, a first input control unit, a first inductor, a first grounded capacitor and a first voltage output end. The first input control unit is grounded through the first inductor and the first grounded capacitor which are in serial connection, and the first voltage output end is connected between the first inductor and the first grounded capacitor in serial connection to output driving voltage to a load. The output current monitoring device further comprises a first RC (resistor-capacitor) integrating circuit, a first voltage sampling unit and a control unit. The first RC integrating circuit is parallelly connected to the first capacitor, and the first voltage sampling unit is connected with the first capacitor to acquire voltage U1 from two ends of the first capacitor and connected with the control unit to transmit the voltage U1 to the control unit. The current of the first capacitor can be indirectly acquired by acquiring the voltage U1 of the first capacitor of the output current monitoring device, and accordingly each phase current of a multi-phase voltage reduction type conversion circuit can be monitored rapidly and accurately.

Description

technical field [0001] The invention relates to an output current monitoring device of a step-down conversion circuit, in particular to a monitoring device for each phase output current of a multi-phase step-down conversion circuit applied to a computer main board. Background technique [0002] In existing computer systems, a step-down conversion circuit (Buck circuit) is usually used as the power supply circuit of the motherboard, and the step-down conversion circuit generally includes a field effect transistor as an electronic switch. In order to obtain a more stable voltage, a larger current and reduce the temperature of the power supply circuit, the power supply circuit of the existing computer motherboard mostly adopts a multi-phase step-down conversion circuit. [0003] However, if the circuit wiring design of the computer motherboard is unreasonable, this will lead to unbalanced current in each phase of the multi-phase step-down conversion circuit, which will cause th...

AI Technical Summary

Problems solved by technology

[0003] However, if the circuit wiring design of the computer motherboard is unreasonable, it will lead to the unbalanced current of each phase of the multi-phase step-down conversion circuit, which will lead to the burning of the field effect tube.

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