CN202710645U

CN202710645U - Optocoupler-free isolation type switching value input detection module

Info

Publication number: CN202710645U
Application number: CN 201220339331
Authority: CN
Inventors: 肖义升; 王晨; 侯昌海; 李志娟
Original assignee: DALIAN REFRIGERATOR Co Ltd; DALIAN BINGSHAN GUARDIAN AUTOMATION Co Ltd
Current assignee: DALIAN REFRIGERATOR Co Ltd; DALIAN BINGSHAN GUARDIAN AUTOMATION Co Ltd
Priority date: 2012-07-13
Filing date: 2012-07-13
Publication date: 2013-01-30
Anticipated expiration: 2022-07-13

Abstract

The utility model discloses an optocoupler-free isolation type switching value input detection module, orderly comprising a bleeder circuit, a filter circuit, a rectification circuit, a denoising circuit and a triode switch circuit. The collector of a triode in the triode switch circuit is connected with the DI end of a one-chip microcomputer, the emitter of the triode is connected with the MUX end of the one-chip microcomputer, and a magneto-electricity or an optoelectronic isolating device does not need. The optocoupler-free isolation type switching value input detection module not only is simple in circuit structure and stable in performance, but also enables an active switching value signal to be detected accurately, the appearance size to be shrunk and the detection device production cost to be reduced substantially.

Description

Without optocoupler isolated form switching value input detection module

Technical field

The utility model relates to the switching value module that a kind of detection has or not ac voltage signal input, and especially a kind of cost is low, it is little of optocoupler isolated form switching value input detection module to take up room.

Background technology

Switching value refers to the state of the "on" and "off" of contact, is used for the running status of equipment in the display system, is divided into two kinds of passive switch amount signal and active switch amount signals.It is the signal of charged not that passive switch amount signal refers to " opening " and "off" state, the step signal of charged and active switch amount signal refers to " opening " and " pass ", 220VAC, 110VAC, 24VDC, 12VDC etc. are generally arranged, and wherein the 220VAC signal is widely used in electrical system with its dirigibility and stability.Switching value input detection module is for detection of the device that has or not the ac voltage signal input, as the most basic in an electrical system link, and the reliability of switching value input detection module and the performance that electric input characteristics directly affects control system.

At present, noise detects stable impact to system in the circuit in order to eliminate, most of switching value module has all been used the means of electrical isolation, use comparatively general have magnetoelectricity isolation and photoelectricity to isolate two kinds, no matter and be isolating transformer and relay or the photoelectrical coupler of photoelectricity isolation of magnetoelectricity isolation, the capital causes profile increase, the production cost of checkout equipment to increase, and particularly because sense channel is more, this impact is even more serious.

Summary of the invention

The utility model is in order to solve the existing above-mentioned technical matters of prior art, provide a kind of cost low, take up room little of optocoupler isolated form switching value input detection module.

Technical solution of the present utility model is: a kind of without optocoupler isolated form switching value input detection module, be provided with successively bleeder circuit, filtering circuit, rectification circuit, removal noise circuit and transistor switching circuit, the DI of the collector of triode and single-chip microcomputer end joins in the described transistor switching circuit, and the emitter of triode and the MUX of single-chip microcomputer end join.

Described bleeder circuit is made of resistance R 1, R2, R3; Described filtering circuit is made of resistance R 4 and capacitor C 1, C2; Described rectification circuit is made of diode D1, D2; Described removal noise circuit is made of capacitor C 3; Described transistor switching circuit is provided with NPN triode TR1, is connected to resistance R 5 with the base stage of triode TR1, is connected to resistance R 6 with the collector of triode TR1.

The utility model need not magnetoelectricity or optical isolation, and not only circuit structure is simple, stable performance, can accurately detect active switch amount signal, and dwindle its physical dimension, greatly reduces the production cost of checkout equipment.

Description of drawings

Fig. 1 is the schematic block circuit diagram of the utility model embodiment.

Fig. 2 is the concrete wiring diagram of the utility model embodiment.

Embodiment

Below in conjunction with description of drawings embodiment of the present utility model.As shown in Figure 1: be provided with successively bleeder circuit, filtering circuit, rectification circuit, removal noise circuit and transistor switching circuit, the I/O mouth DI of the collector of triode and single-chip microcomputer end joins in the described transistor switching circuit, and the I/O mouth MUX end of the emitter of triode and single-chip microcomputer joins.Specifically circuit as shown in Figure 2: described bleeder circuit is made of resistance R 1, R2, R3; Described filtering circuit is made of resistance R 4 and capacitor C 1, C2; Described rectification circuit is made of diode D1, D2; Described removal noise circuit is made of capacitor C 3; Described transistor switching circuit is provided with NPN triode TR1, is connected to resistance R 5 with the base stage of triode TR1, is connected to resistance R 6 with the collector of triode TR1.

Principle of work:

1. single-chip microcomputer MUX holds output low level, as the gating signal of sense channel.When selected sense channel has the input of 220VAC signal, bleeder circuit is down to 220VAC about 20VAC, after filtering circuit filtering the 20VAC signal being input to rectification circuit, is the 20VDC signal with the 20VAC signal rectification, removes the effect that the noise circuit can play the erasure signal noise behind the rectification circuit, at this moment, the emitter junction positively biased of triode TR1, triode TR1 is in conducting state, because the effect of pull-up resistor R6, the DI mouth of single-chip microcomputer will detect low level, namely be shown as " opening "; When selected sense channel was inputted without the 220VAC signal, during the input end 220VAC blackout of sense channel, triode TR1 was in cut-off state, and the DI mouth of single-chip microcomputer will detect high level, namely be shown as " pass ";

2. the MUX mouth of single-chip microcomputer is output as not this passage of gating of high level interval scale, and this moment, no matter whether input end had the 220VAC signal, and the DI mouth of MCU all will detect high level.

Claims

1. one kind without optocoupler isolated form switching value input detection module, it is characterized in that: be provided with successively bleeder circuit, filtering circuit, rectification circuit, removal noise circuit and transistor switching circuit, the DI of the collector of triode and single-chip microcomputer end joins in the described transistor switching circuit, and the emitter of triode and the MUX of single-chip microcomputer end join.

2. according to claim 1 without optocoupler isolated form switching value input detection module, it is characterized in that: described bleeder circuit is made of resistance R 1, R2, R3; Described filtering circuit is made of resistance R 4 and capacitor C 1, C2; Described rectification circuit is made of diode D1, D2; Described removal noise circuit is made of capacitor C 3; Described transistor switching circuit is provided with NPN triode TR1, is connected to resistance R 5 with the base stage of triode TR1, is connected to resistance R 6 with the collector of triode TR1.