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Inverter circuit device with temperature testing circuit

A technology of temperature detection circuit and circuit device, applied in circuit device, emergency protection circuit device, output power conversion device, etc., can solve the problem that the temperature rise of inverter circuit cannot be detected.

Inactive Publication Date: 2008-07-16
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, the inverter circuit was mounted on the printed wiring board 4, and the thermistor 3a was provided on the heat sink 5 on which the inverter circuit was mounted, so that the correct temperature rise of the inverter circuit could not be detected. , in addition, there needs to be a certain interval

Method used

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  • Inverter circuit device with temperature testing circuit
  • Inverter circuit device with temperature testing circuit
  • Inverter circuit device with temperature testing circuit

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Experimental program
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Embodiment Construction

[0022] figure 1 A block diagram of an inverter circuit arrangement with a temperature detection circuit of the present invention is shown in .

[0023] The inverter circuit of the present invention includes: a conversion circuit 9 composed of conversion elements Q1, Q2, Q3 of the upper branch and conversion elements Q4, Q5, Q6 of the lower branch; input to the control electrodes of each conversion element, A drive circuit 2 for controlling switching of the conversion element; and a control circuit 1 for generating a control signal input to the drive circuit 2 .

[0024] Loads such as a motor M are connected to connection points U, V, and W of the switching elements Q1 and Q4, switching elements Q2 and Q5, and switching elements Q3 and Q6 of the switching circuit 9. The pulse width modulated rectangular wave is output from the control circuit 1 to the drive circuit 2 to control the conversion circuit 9 .

[0025] The present invention is characterized in that the control circ...

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PUM

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Abstract

In order to enable overheat protection and overcurrent protection as well as temperature detection of an inverter circuit, an inverter circuit comprises a switching circuit 9 composed of a plurality of switching elements and a control circuit 1 for generating a control signal to be inputted into a drive circuit 2 to control a load, a temperature detecting element 12 for detecting a change in temperature of the inverter circuit is provided in a temperature detection circuit 10, and a temperature detection signal which changes according to a change in temperature of said inverter circuit, an overheat abnormal signal outputted upon a rise in temperature to a predetermined temperature or more, and an overcurrent abnormal signal outputted from an overcurrent protection FET 13 are outputted via one commonly used terminal.

Description

technical field [0001] The invention relates to an inverter circuit device, which includes a detection circuit capable of overheat protection and overcurrent protection. Background technique [0002] First, the operation of the inverter circuit device having a temperature detection circuit and its control circuit will be briefly described with reference to FIG. 6 . [0003] A reference signal of a frequency corresponding to the rotation speed setting signal is output to the drive circuit 2 from the control circuit 1 composed of a microcomputer or DSP. This reference signal is composed of three pulse-width-modulated rectangular waves each with a phase difference of 120° and three rectangular waves corresponding to these pulse-width-modulated rectangular waves, generally delayed in phase by 180°. [0004] Three pulse-width-modulated rectangular waves with a phase difference of 120 degrees respectively pass through the drive circuit 2 and are input to the control electrodes of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02H7/122H02H5/04H02M7/497
CPCH02H7/122H02H5/041H02H5/042H02M1/32H02M7/48H02H7/10
Inventor 饭村纯一大川克实小池保广泉谷壮一
Owner SANYO ELECTRIC CO LTD