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Signal output circuit

A signal output and circuit technology, applied in the direction of circuits, relays, electrical components, etc., can solve the problem of cars not being able to drive

Active Publication Date: 2013-06-12
OMRON AUTOMOTIVE ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the driving of the load stops due to malfunction of the circuit, the car may not be able to run

Method used

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  • Signal output circuit
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Embodiment Construction

[0036] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the same code|symbol is attached|subjected to the same part or a corresponding part.

[0037] exist figure 1 Among them, the signal output circuit of this embodiment is constituted by the CPU 3 , the switch circuit 100 and the output terminal T. The switching circuit 100 is composed of a first switching unit U1 having a first switching element 11 and a second switching element 12 , and a second switching unit U2 having a third switching element 13 and a fourth switching element 14 . The switching elements 11 to 14 are each composed of FETs.

[0038] The CPU 3 has two input ports 4,5 and two output ports 6,7. The battery 1 as a DC power supply is connected to the input port 4 via the operation switch 2 ( SW1 ). One end of the operation switch 2 is connected to the positive electrode of the battery 1 , and the other end of the operation switch 2 is conne...

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Abstract

Provided is a signal output circuit capable of outputting a normal signal in accordance with an input signal, even when part of the circuit fails. A signal output circuit includes a CPU (3), a switching circuit (100), and an output terminal (T). The switching circuit (100) includes: a first switching unit (U1) having a first switching element (11) and a second switching element (12), and a second switching unit (U2) having a third switching element (13)and a fourth switching element (14). The drain (d), source,(s) and gate (g) of each of the first and second switching elements (11, 12) are connected to a power source (Vb), drains (d)of the third and fourth switching elements (13,14), and a first output port (6) of the CPU (3), respectively. The source (s) and gate (g)of each of the third and fourth switching elements (13,14) are connected to the output terminal (T) and a second output port (7) of the CPU (3).

Description

technical field [0001] The present invention relates to a signal output circuit that outputs a predetermined signal based on an input signal. Background technique [0002] Such signal output circuits are used for various purposes. For example, in the case of an automobile, the signal output circuit outputs signals to drive various loads for starting the engine, assisting the brakes, lighting the headlights, and the like. For drives that drive these loads, safety and reliability are required. If the drive of the load stops due to a malfunction of the circuit, the car may not be able to run. [0003] Patent Document 1 describes an example of a circuit device including two MOSFET output stages connected in series in order to switch a load based on a switch ON signal. These MOSFETs are respectively controlled via a logic circuit. In addition, the logic circuits are connected to each other via connection paths in order to monitor each other for short-circuiting of the MOSFETs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/04
CPCF02N11/087F02N2011/0874H01H47/00
Inventor 古井崇介折金俊典牛山博贵藤原宏之
Owner OMRON AUTOMOTIVE ELECTRONICS CO LTD