Load driving device

A load-driven and pulse-driven technology, which is applied to measuring devices, logic circuit connections/interface layouts, instruments, etc., can solve problems such as pulse drive circuit failures

Active Publication Date: 2014-03-12
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, continuous driving of resistive loads in the event of a short circuit with respect to ground potential or supply potential can lead to failure of pulsed drive circuits

Method used

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Embodiment Construction

[0035] Embodiments of the present invention will be described below with reference to the drawings. figure 1 It is a figure which shows the schematic structure of the load drive apparatus 1 of this embodiment. The load driving device 1 drives a resistive load, and in this embodiment, the use of the load driving device 1 to drive a detection element (not shown) for an oxygen sensor mainly made of a solid electrolyte body such as zirconia is exemplified. The case of heater 2 for heating. Descriptions for the oxygen sensor and detection elements will be omitted.

[0036] The load driving device 1 includes a microprocessor 10 , a pulse driving circuit 14 , an FET 15 , a resistor R, and the like, and is used to drive the heater 2 .

[0037] One end 2N of the heater 2 is connected to the ground terminal 21 via the lead wire 23 , and the ground terminal 21 is grounded to the ground potential GND within the circuit of the load driving device 1 . The other end 2P of the heater 2 is ...

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Abstract

A load driving device includes a pulse driving circuit which has a capacitor between an output terminal and a ground potential, a level detection circuit which detects whether an output terminal voltage on the output terminal of the pulse driving circuit is at high level or at low level, a switching discharge unit for forming a discharge path through which electric charges charged in a capacitor are discharged by switching of a switch from a non-discharge side to a discharge side, and switching the switch to the discharge side over a discharge maintenance time in a state where the application of a pulse voltage by the pulse driving circuit stops and the output terminal voltage is maintained at high level, a post-discharge detection unit, and a determination unit.

Description

technical field [0001] The present invention relates to a load driving device including a pulse driving circuit for repeatedly applying a pulse voltage to a resistive load. Background technique [0002] Generally, for example, as a load driving device that drives a resistive load such as a detection element for an oxygen sensor mainly made of a solid electrolyte body such as zirconia, a load driving device including a pulse driving circuit is used. A heater or the like for heating, and an output terminal of the pulse driving circuit are connected to the other end of a resistive load grounded at one end, and the pulse driving circuit repeatedly applies a pulse voltage to the resistive load. In this load driving device, an abnormality such as a short circuit to the ground potential or a power supply potential or a disconnection in the connection path may occur in the connection path between the pulse drive circuit and the resistive load. In particular, continuous driving of r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175G01R31/02
CPCH03K5/19
Inventor 三野润一郎
Owner NGK SPARK PLUG CO LTD
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