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Input circuit and input device

An input circuit and circuit technology, applied in the direction of electrical program control, digital control, etc., can solve problems such as damage to switching elements, and achieve the effects of preventing damage, rapid recovery, and reliable switching

Active Publication Date: 2012-04-18
BROTHER KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a current exceeding the capacity of the switching element flows, the switching element will be damaged

Method used

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  • Input circuit and input device
  • Input circuit and input device
  • Input circuit and input device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0028] figure 1 It is an input circuit diagram of Embodiment 1. The input circuit 1 is provided in a numerical control device of a machine tool and mounted on a board not shown. The input circuit 1 includes a control device 10 connected to a DIP (Dual In-line Package: dual in-line package) switch 70 (selection unit) and a terminal block 11 . The DIP switch is indicated as DIP SW in the figure.

[0029] The control device 10 includes, for example, FPGA (Field Programmable Gate Array: Field Programmable Gate Array), ASIC (Application Specific Integrated Circuit: Application Specific Integrated Circuit), or a microcomputer. The control device 10 includes input ports 61 , 62 and output ports 63 , 64 . The control device 10 controls driving of a FET (Field Effect Transistor: Field Effect Transistor), which will be described later, based on the selection of the DIP switch 70 . The control device 10 operates with a signal of the 3.3V system.

[0030] The input circuit 1 include...

Embodiment approach 2

[0056] Such as Figure 4 As shown, the input device 100 includes a first input circuit (one input circuit) 1a and a second input circuit (another input circuit) 1b. The first input circuit 1a is the same as the input circuit 1 of the first embodiment. The second input circuit 1 b includes a control device 80 connected to a DIP switch 90 (selection mechanism) and a terminal block 110 .

[0057] The control device 80 includes, for example, an FPGA, an ASIC, or a microcomputer. The control device 80 has input ports 81 , 82 and output ports 83 , 84 . The control device 80 performs drive control of FETs described later by selection of the DIP switch 90 . The control device 80 operates with a signal of the 3.3V system.

[0058] The input circuit 1 b includes a third input terminal 23 , a p-type MOSFET 33 (third switching element, hereinafter referred to as FET 33 ), a third resistor 43 , and a third conversion circuit 53 . The third input terminal 23 is connected to external eq...

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PUM

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Abstract

The invention relate to an input circuit which is used to input a leakage signal and a source signal from an external device and an input device. The input device is provided with the input circuit. When a mode corresponding to the leakage input is selected by a DIP switch, a control device turns off a p type MOSFET and turns on an n type MOSFET. When an operator connects an external power supply with a second input terminal by mistake, a big current passes through the n type MOSFET. When a current bigger than a rated current passes through an FET, a fuse is cut off immediately, so the FET can be not damaged. When a mode corresponding to the source input is selected by the DIP switch, the p type MOSFET is turned on and the n type MOSFET is turned off. The input current can be switched into the leakage type or the source type without replacing a bottom plate.

Description

technical field [0001] The present invention relates to an input circuit for inputting a sink signal or a source signal from an external device and an input device having the input circuit. Background technique [0002] Generally, the numerical controller of a machine tool has an output circuit and an input circuit. The output circuit outputs signals to external devices that can be connected to the machine tool. A signal is input to the input circuit from an external device. When the input / output signal of the external device is a source type signal, an input / output circuit corresponding to the source type is used in the numerical controller. When the input / output signal of the external device is a sink type signal, an input / output circuit corresponding to the sink type is used in the numerical controller. The operator replaces the input / output circuit of the numerical controller so that the type of the input / output circuit of the numerical controller matches the type of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/18
Inventor 鹈饲敏明矶田康吉
Owner BROTHER KOGYO KK