Power converter

A power conversion device and power terminal technology, which is applied to output power conversion devices, circuits, electrical components, etc., can solve the problems of periodic on-off duty cycle limitation, high price, unavoidable enlargement and cost increase, etc. low cost effect
CN101047341AInactive Publication Date: 2007-10-03HITACHI LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HITACHI LTD
Publication Date
2007-10-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

A power conversion device is provided. Switching elements are connected in series, currents IU and IL flowing in respective elements are switched, and an output current IO is supplied to a load, such as a motor, from an output terminal O. In this case, a MOSFET having a mirror element, where mirror elements are provided in main switching elements, is used as the switching elements; current detection circuits are provided in respective mirror elements each; the current detection circuits extract mirror currents IU, IL flowing in the mirror elements as detection signals S< IU>, S; the detection signals are inputted into a comparison circuit 9 as a difference signal S of the detection signals S, S; the difference signal is input to a control operation section 6 as a signal indicating the output current IO; and the switching timing of the switching elements and switching time are controlled. Therefore, a compact, low-loss, and low-cost power conversion device for detecting current is provided, where there is no risk of restriction on output voltage performance.
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Description

technical field

[0001] The present invention relates to a power conversion device with an output current detection function, in particular to a power conversion device suitable for a servo system, a DC / DC converter or a three-phase AC inverter. Background technique

[0002] It is common practice to detect the output current for the control of power conversion devices such as servo systems, DC / DC converters, or three-phase AC inverters, and various current sensors have been proposed. (core) insulated current sensor is the so-called Hall sensor. Here, the Hall sensor means that a conductor through which the current to be measured is passed through a ring-shaped magnetic core, and the Hall sensor installed on the magnetic circuit of the magnetic core reads the magnetic field generated by the current and detects it as a current.

[0003] In addition, in addition to the Hall sensor, there is also known a shunt resistance type current sensor in which a shunt resistance is inserte...

Claims

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