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Load drive control circuit

A load driving circuit and driving circuit technology, applied in the direction of DC motor rotation control, control system, DC motor speed/torque control, etc., can solve the problem of heating and damage of the driving control circuit 84

Inactive Publication Date: 2009-01-28
KK TOKAI RIKA DENKI SEISAKUSHO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, an overcurrent may flow to the drive control circuit 84, which may cause the drive control circuit 84 to generate heat and be damaged.

Method used

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  • Load drive control circuit
  • Load drive control circuit
  • Load drive control circuit

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Embodiment Construction

[0034] Usually, the drive circuit enters the first working state according to the first control command from the control circuit. The drive circuit enters the second working state according to the second control command. The drive circuit monitors its own operating state, and when detecting an abnormal state such as overcurrent, notifies the control circuit of the abnormality via a diagnosis line. The control circuit performs corresponding operations in response to the notification. In a general load drive control circuit with this structure, if one or more diagnostic lines connecting the drive circuit and the control circuit fail to work normally, the signal flowing through the diagnostic line may change regardless of the operating state of the drive circuit In any case, it is fixed to an active state (that is, H level) or an inactive state (L level). If the diagnosis line fails to work normally, it is difficult to provide an accurate notification of the abnormality of the ...

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Abstract

A load drive control circuit includes a drive circuit for driving a load. A control circuit, connected to the drive circuit by diagnostic lines, provides the drive circuit with a control command that specifies an operation state. The drive circuit drives the load in the operation state specified by the control command, generates a diagnostic output including diagnostic notification signals each having an H level or an L level, and provides the diagnostic notification signals of the diagnostic output to the control circuit. A signal output unit outputs first and second diagnostic outputs respectively in response to the first and second control command from the control circuit. A diagnostic line failure determination unit checks whether the first and second diagnostic outputs are both normal to determine whether the diagnostic lines includes a failure or not.

Description

technical field [0001] The invention relates to a load driving control circuit for controlling and driving loads, such as motors, lamps and the like. Background technique [0002] In the prior art, a motor driving circuit is used to drive the motor. Japanese Patent Laid-Open No. 2006-158162 describes an H-bridge motor drive circuit. FIG. 8 shows an H-bridge motor drive circuit 81 . The motor drive circuit 81 includes a system control circuit 82 and a drive control circuit 84 , the drive control circuit 84 drives and controls the motor 83 according to the control command received from the system control circuit 82 . [0003] The system control circuit 82 is connected to the drive control circuit 84 through a plurality of signal lines Ls ( Ls1 , Ls2 , . . . , Lsk). The signal lines Ls include motor control lines Ls1 and Ls2 and an operation control line Lsk. The motor control lines Ls1 and Ls2 are signal paths for commands output from the system control circuit 82 to the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P7/18H02P7/285H02P1/22B60R1/07H02P5/46H02P7/288
CPCH02P7/0044H02P7/04
Inventor 西部泰司宇留野聪规长尾贵史近沢聪
Owner KK TOKAI RIKA DENKI SEISAKUSHO