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Load driving device

A technology of load driving and driving side, which can be used in measurement devices, circuit devices, control devices, etc., and can solve the problems of synchronous rectification circuits that cannot achieve accuracy.

Active Publication Date: 2020-12-11
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when driving with a low duty ratio or a low power supply voltage, etc., the current flowing to the synchronous rectification circuit may not be as accurate as the current detection. In this case, there is a possibility of false detection as an open circuit

Method used

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Examples

Experimental program
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Effect test

no. 1 Embodiment

[0025] figure 1 A circuit configuration diagram in this embodiment is shown.

[0026] The load driving device 101 includes a synchronous rectification circuit 104 including a high-side FET 102 and a low-side FET 103 . An inductive load 106 and a terminal capacitor 107 are connected to a synchronous rectification circuit output terminal 105 of the synchronous rectification circuit 104 . In the present embodiment, the synchronous rectification circuit 104 has a low-side configuration where the load 106 is connected to the power supply voltage VB. Therefore, the high-side FET 102 operates as a return-side switching element, and the low-side FET 103 operates as a driving-side switching element. The terminal capacitor 107 serves to protect the synchronous rectification circuit 104 from external surges.

[0027] The drive control circuit 108 controls the respective gate voltages of the high-side FET 102 and the low-side FET 103 to turn ON / OFF according to the input PWM command.

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no. 2 Embodiment

[0052] Figure 4 It is a circuit configuration diagram in the second embodiment. In this embodiment, the structure of the load 401 is different from that of the first embodiment. In addition, the same code|symbol is attached|subjected about the structure common to 1st Example, and description is abbreviate|omitted.

[0053] In this embodiment, the synchronous rectification circuit 104 has a high-side configuration in which the load 401 is connected to GND, the high-side FET 102 operates as a drive-side switching element, and the low-side FET 103 operates as a return-side switching element. Other configurations are the same as those of the first embodiment, and in the following description, descriptions will be made centering on parts different from the first embodiment.

[0054] Figure 5 It is a timing chart showing an example of the operation of this embodiment. Since the synchronous rectification circuit 104 is a high-side configuration, in normal control Figure 5 Whe...

no. 3 Embodiment

[0060] Image 6 It is a circuit configuration diagram in the third embodiment. In this embodiment, the configuration of the input and output signals of the PWM command generation circuit 601 and the current detection circuit 109 is different from that of the first embodiment. In addition, the same code|symbol is attached|subjected about the structure common to 1st Example, and description is abbreviate|omitted.

[0061] The current detection circuit 109 receives a diagnosis signal from the drive control circuit 108 , and outputs the current detection result and an error signal indicating that the current detection result is incorrect to the PWM command generation circuit 601 .

[0062] The PWM command generating circuit 601 receives a current detection result, an error signal, and a current command value, and generates a PWM command so that the current flowing to the synchronous rectification circuit 104 becomes equal to the current command value. That is, when the error signa...

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Abstract

In past methods, at least one cycle of diagnostic time was required in order to detect pulses, and a problem was presented in that the diagnostic time was long. This load driving device is provided with a drive-side switching element, a synchronization rectifier circuit having a reflux-side switching element, a driver control circuit for controlling the synchronization rectifier circuit, and a voltage monitor circuit for monitoring whether or not the voltage of an output terminal of the synchronization rectifier circuit is within a prescribed voltage range. When a diagnosis command is received, the driver control circuit performs control so that, when the drive-side switching element is switched from ON to OFF, the reflux-side switching element also turns OFF. In a period during which thedrive-side switching element and the reflux-side switching element are both OFF, the voltage monitor circuit detects a normal state when the voltage being monitored is at a normal level.

Description

technical field [0001] The present invention relates to a load driving device provided with a synchronous rectification circuit. Background technique [0002] As an abnormality detection in a load driving device, it is sometimes necessary to detect a power failure, a ground fault, and an open circuit. Especially in the detection for automobiles, due to fuel efficiency and safety issues, it is required to be implemented under a wide range of driving conditions. Anomaly detection. In addition, as an open circuit detection in a synchronous rectifier circuit which is one form of a circuit for driving a load, there is a method of detecting a current flowing to the synchronous rectifier circuit and determining that the circuit is open when no current flows. However, when driving with a low duty ratio or a low power supply voltage, the current flowing to the synchronous rectification circuit may not be as accurate as the current detection. In this case, there is a possibility of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/54G01R31/34H02H3/00H02M7/21H02P7/29G01R31/50
CPCH02H3/00H02P7/29G01R31/40H02M3/1588H02M1/32Y02B70/10G01R31/50B60W20/50B60W50/0205B60W2050/021H02P29/024
Inventor 小原友里杉山泰志山下毅雄土肥昌宏
Owner HITACHI ASTEMO LTD
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