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Overcurrent detection circuit for switches

A technology for detecting circuit and overcurrent, applied in circuit breaker testing, measuring current/voltage, electronic switch, etc., can solve problems such as current imbalance

Pending Publication Date: 2019-10-18
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

current unbalance

Method used

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  • Overcurrent detection circuit for switches
  • Overcurrent detection circuit for switches
  • Overcurrent detection circuit for switches

Examples

Experimental program
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Effect test

no. 1 example

[0024] Refer below Figure 1 to Figure 5 A first embodiment of the present disclosure will be described. The first embodiment shows, for example, an overcurrent detection circuit for the rotary electric machine 30 as a component of the control system CS.

[0025] refer to figure 1 , the control system CS has a battery 10 serving as a direct current (DC) power source, an inverter 20 serving as a power converter, a rotating electric machine 30 , and a control device 40 .

[0026] The rotary electric machine 30 is electrically connected to the battery 10 via the inverter 20 . The first embodiment uses a permanent magnet synchronous three-phase rotating electric machine as the electric rotating machine 30 . Specifically, the rotary electric machine 30 includes: a rotor having permanent magnets; and a stator having a stator core and three-phase stator coils 31 . In particular, the rotating electric machine 30 is capable of rotating a rotor with permanent magnets based on magnet...

no. 2 example

[0105] The following reference Image 6 A second embodiment of the present disclosure is described. Image 6 Each drive circuit DrA according to the second embodiment is schematically shown. The structure and / or function of the drive circuit DrA according to the second embodiment differs from that of the drive circuit Dr according to the first embodiment in the following points. Therefore, the following description will mainly be made on different points, and the description of the same parts assigned the same or the same reference numerals between the first embodiment and the second embodiment will be omitted or simplified to thereby save repeated explanation.

[0106] The drive circuit DrA has a first equalizing resistor 61A and a second equalizing resistor 61B instead of the equalizing circuit 60 . Each of the first equalizing resistor 61A and the second equalizing resistor 61B functions as, for example, a judgment voltage generator.

[0107] Each of the first balancing ...

no. 3 example

[0120] The following reference Figure 7 A third embodiment of the present disclosure is described. Figure 7 Each drive circuit DrB according to the third embodiment is schematically shown. The structure and / or function of the drive circuit DrB according to the third embodiment differs from that of the drive circuit DrA according to the second embodiment in the following points. Therefore, the following description will mainly be made on different points, and the description of the same parts assigned the same or the same reference numerals between the second embodiment and the third embodiment will be omitted or simplified to thereby save repeated explanation.

[0121] The drive circuit DrB is configured such that, in addition to the first end of the first balancing resistor 61A and the sensing terminal StA of the first switch SWA, the first end of the first sensing resistor 55A is connected to the second comparator The non-inverting input terminal of device 70B.

[0122]...

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PUM

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Abstract

The present invention provides an overcurrent detection circuit for a switch and a drive circuit which are used for connection in parallel to each other. In the overcurrent detection circuit for switches parallely connected to each other, sense detectors are respectively provided for the switches. Each of the sense detectors detects a sense voltage of the corresponding one of the switches. The sense voltage of each of the switches is based on a sense current associated with a current flowing through the corresponding one of the switches. A parameter calculator calculates, based on the sense voltages calculated by the respective sense detectors, a determination parameter that is less subject to imbalance between currents flowing through the respective switches. A determiner determines whether a value of the determination parameter is higher than an overcurrent threshold, and determines that there is an overcurrent flowing through at least one of the switches upon determining that the value of the determination parameter is higher than the overcurrent threshold.

Description

technical field [0001] The present disclosure relates to an overcurrent detection circuit and a drive circuit for a switch. Background technique [0002] For example, Japanese Patent Application Publication No. 2015-104208 discloses such an overcurrent detection circuit for parallel-connected switches such as IGBTs. Specifically, the overcurrent detection circuit disclosed in the published patent document has a sense detector and a judger. The sense detectors described above are provided for each switch. Each sensing detector detects the sensing voltage according to the tiny current flowing from the corresponding one of the switches, and the tiny current is related to the current flowing through the corresponding one of the switches. [0003] The judging device is configured to judge whether at least one of the sensing voltages of the respective switches is higher than a predetermined overcurrent threshold, and when it is judged that the at least one sensing voltage is hig...

Claims

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Application Information

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IPC IPC(8): H02M1/08G01R19/165G01R31/327
CPCH02M1/08G01R19/165G01R31/327H02M1/0009H02M1/32H02M1/088H02M7/5387H03K17/127H03K17/0828G01R19/16528G01R19/16547H02M7/219H03K17/08
Inventor 蘭明文
Owner DENSO CORP