CN104660233A

CN104660233A - Multiplex digital electronic branch switch

Info

Publication number: CN104660233A
Application number: CN201310580129.XA
Authority: CN
Inventors: 吴顺喜; 李国彪
Original assignee: Hubei University of Arts and Science
Current assignee: Hubei University of Arts and Science
Priority date: 2013-11-19
Filing date: 2013-11-19
Publication date: 2015-05-27

Abstract

The present invention provides a multiplex digital electronic branch switch. The branch switch capable of respectively regulating and controlling several electricity loads consists of a power supply module, a controlling module and a regulating and controlling module. One rectifier bridge and two voltage-regulator tubes are installed in the power supply module; a high speed digital chip output pin installed in the controlling module is respectively joined with several field-effect tubes in the regulating and controlling module and the rectifier bridge; several rectifier bridges are respectively joined with several electricity loads. The present invention achieves using one switch for regulating and controlling the respective opening and closing of the several electricity loads; moreover, the overall component adopts a digital module, thereby replacing a conventional circuit design which may cause a phenomenon of switch failures caused by contact contactor carbon deposit easily achieved by using a relay; and the switch has characteristics such as using one switch for regulating and controlling several electricity loads, being safe and stable, and having a long service life.

Description

Multiplexing digital electric branch switch

Technical field

The present invention relates to a kind of electronic switch, specifically a kind of multiplexing digital electric branch switch.

Background technology

The electronics branch switch now commercially generally applied mostly designs and uses relay as on-off switch, and because relay contact is mechanical type contact in use procedure, frequent contact sparking causes contact carbon deposit, makes branch switch out of control.

Summary of the invention

The object of the present invention is to provide a kind of multiplexing digital electric shunt controller, it is made up of three modules: switch module ( _~220V), time-sequence control module U1 (74LS161), power module.

The present invention is superior, and part is _~220V switch module uses high speed, high pressure, low-power consumption high-power FET (NMOS) as switching tube, and the relay mechanical contact coordinating electric bridge to substitute in conventional circuit design contacts; The interchange end input of electric bridge, output share, DC terminal positive pole connects the drain D of field effect transistor (NMOS), negative pole connects the source S of field effect transistor (NMOS), by the open and close state of the grid G voltage control field effect transistor (NMOS) of field effect transistor (NMOS).G pole adds 4 between S pole _~during 12V direct voltage, field effect transistor (NMOS) conducting, the interchange input of electric bridge, output normally, load is access in _~220V; When between S pole, G pole, voltage is 0V, field effect transistor (NMOS) is ended, and electric bridge exchanges and exports in high-impedance state, realizes electrical equipment completely and connects and control.

High-speed figure chip U1 (74LS161) is as on-off controller, its operation principle is: it can control the grid voltage (the design has only used three) of four field effect transistor (NMOS) respectively, and three outputs Q0, Q1, Q2 are connected to the grid of field effect transistor (NMOS) V1, V2, V3 respectively by current-limiting resistance R1, R3, R6.Last group Q3 does not select, its base stage by current-limiting resistance R2 and triode Q4 is connected, the collector electrode of triode Q4 and U1(74LS161) MR end connect as asynchronous resetting end, the triode Q4 saturation conduction when Q3 is high level, MR end disconnects whole load with drawing in, and waits for that next pulse continues counting after arriving.Wherein three outputs have 8 kinds of compound modes, respectively:

000: three group of load all ends;

001: the first group of load conduction, remaining cut-off;

010: the second group of load conduction, remaining cut-off;

011: first and second organizes load conduction, the 3rd group of cut-off;

100: the three groups of load conduction, remaining cut-off;

101: first and third groups of load conduction, second group of cut-off;

110: second and third organizes load conduction, first group of cut-off;

111: three groups of whole conductings; Said process is all opened with S1---and close and realize successively.

Power module is first by rectification, and electric capacity C2 and the networking step-down of resistance R5 parallel filtering, then, meet filter capacitor C4 by rectifier bridge D4, meets 5.6V voltage stabilizing didoe D6 to ground finally by power resistor RD1.Voltage-stabiliser tube voltage to earth is 5.6V, meets a reverse-filling diode D5 from 5.6V, and diode D5 exports 5V voltage to electric capacity C3, is used for as chip U1 (74LS161) provides power supply.Resistance R7, R8 electric capacity C5 is to U1(174LS161) clock pulse (CLOK) is provided.Resistance R2 is pull-up resistor, and electric capacity C1 is automatic clear when first time powers on, to ensure that sequencing control entanglement does not occur.In figure, CLOK is clock pulse, plays numeration effect.

Beneficial effect: multiplexing digital electric branch switch can save the wire rod cost of control circuit, replaces the relay used in conventional circuit design; Mechanical contact contact easily sparking carbon deposit causes switch failure.The present invention realizes electrical equipment completely and connects and control, and improves switching stability, extends the useful life of digital electric branch switch.

Embodiment illustrates: designed electronic device is pressed circuit diagram erecting and welding on pcb board, be arranged in corresponding insulation shell with insulating paper after doing insulating package, then controlled load the end of a thread and this digital electric branch switch output wiring terminal are connected respectively.

Claims

1. a multiplexing digital electric shunt controller, is characterized in that: _~220V switch module uses high speed, high pressure, low-power consumption high-power FET (NMOS) as switching tube, and cooperation electric bridge substitutes the relay in traditional circuit; The interchange end input of electric bridge, output share, and the positive pole of DC output end connects the drain D of field effect transistor (NMOS), and negative pole connects the source S of field effect transistor (NMOS).

2. multiplexing digital electric shunt controller according to claim 1, is characterized in that: by the open and close state of the grid G voltage control field effect transistor (NMOS) of field effect transistor (NMOS).G pole adds 4 between S pole _~during 12V direct voltage, field effect transistor (NMOS) conducting, the interchange input of electric bridge, output normally, load is access in _~220V; Field effect transistor (NMOS) cut-off when voltage is 0V between S pole, G pole, electric bridge exchanges and exports in high-impedance state, realizes electrical equipment completely and connects and control.

3. multiplexing digital electric shunt controller according to claim 1, it is characterized in that: high-speed figure chip U1 (74LS161) is as on-off controller, control the grid voltage of four field effect transistor (NMOS) successively, three outputs Q0, Q1, Q2 are connected to the grid of field effect transistor (NMOS) V1, V2, V3 respectively by current-limiting resistance R1, R3, R6.