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Switching circuit device and power supply device having same

A technology for switching circuits and power supply devices, applied in the direction of output power conversion devices, electrical components, electronic switches, etc., which can solve the problems of high turn-on resistance and increased loss, and achieve the effect of low turn-on resistance and rapid change suppression

Inactive Publication Date: 2012-10-24
TRANSPHORM JAPAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the on-resistance of the switching transistor is made high to avoid this phenomenon, the losses increase

Method used

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  • Switching circuit device and power supply device having same
  • Switching circuit device and power supply device having same
  • Switching circuit device and power supply device having same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] figure 1 The circuit and operation waveforms of the power supply device with the switching circuit device are shown. The power supply device has: an inductor L1 coupled to an AC power source AC; a diode D1 (which is a unidirectional element) provided between the inductor L1 and an output OUT; and a connection node (first node) SW connecting the inductor L1 and Diode D1. The power supply device also has: a switching transistor Q0 provided between the first node SW and a second node (ground) or another reference power supply VSS; and a gate driver 10 generating a gate voltage applied to the switching transistor Q0 according to a control signal IN. Pole drive signal G0. The switching transistor Q0 is a high-voltage power transistor to which a high voltage is applied, and it turns on and off a large current flowing in the inductor L1. In this example, an N-channel MOSFET is used.

[0018] As shown in the operation waveform diagram, when the gate driver 10 raises the dri...

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PUM

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Abstract

A switching circuit device provided between a first node and a second node within a power supply circuit, an inductor being coupled to the first or second node, the switching circuit device has: a first transistor that is provided between the first node and the second node and has a first gate width,a second transistor that is provided in parallel with the first transistor between the first node and the second node and has a second gate width larger than the first gate width,and a driving signal generation circuit, which, in response to a control signal generated according to an output voltage of the power supply circuit, outputs a first driving signal which drives the first transistor on and off, and a second driving signal which drives the second transistor on and off, with different timings between the first driving signal output and the second driving signal output.

Description

technical field [0001] Embodiments of the present invention relate to a switching circuit device, and to a power supply device having such a switching circuit device. Background technique [0002] The power supply circuit generates a step-up power supply that increases the voltage of an AC power supply or a DC power supply, or a step-down power supply that lowers the voltage. The power supply circuit has an inductor, a switching circuit device that switches the inductor current on and off, and a control signal generating circuit that generates a control signal to control this switching. This control signal generation circuit monitors the output voltage of the power supply circuit and generates a control signal so that the output voltage becomes a desired voltage. The power supply circuit generates an output voltage at a desired voltage by switching the inductor current on and off according to the control signal by the switching circuit device. [0003] A relatively high vo...

Claims

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Application Information

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IPC IPC(8): H02M1/08H02M7/217
CPCH03K17/164H02M3/158H02M1/44
Inventor 竹前义博
Owner TRANSPHORM JAPAN
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