CN205105185U

CN205105185U - Cross internal circuit that zero output type exchanged solid state relay

Info

Publication number: CN205105185U
Application number: CN201520744044.5U
Authority: CN
Inventors: 沈富德
Original assignee: SIRECTIFIER ELECTRONICS TECHNOLOGY Corp
Current assignee: SIRECTIFIER ELECTRONICS TECHNOLOGY Corp
Priority date: 2015-09-23
Filing date: 2015-09-23
Publication date: 2016-03-23
Anticipated expiration: 2025-09-23

Abstract

The utility model relates to a cross internal circuit that zero output type exchanged solid state relay, including input circuit, buffer circuit and output circuit, input circuit comprises input resistance R1, emitting diode LED and protective diode VD1, buffer circuit comprises optoelectronic coupler IC1, divider resistance R2, divider resistance R3, driving resistance R4, triode V1, silicon controlled rectifier SCR, rectifier, divider resistance R5, driving resistance R6 and bidirectional thyristor BTA, but output circuit comprises electric capacity C1, output resistance R7 and regulating electrical resistance R8, electric capacity C1 and output series resistance, but the electric capacity C1 of series connection and output resistance R7 are parallelly connected with regulating electrical resistance R8. The beneficial effects of the utility model are that: defeated entry control voltage is low, and drive current is little, adopt optoelectronic isolation, can realize, accomplishing forceful electric power and light current and keeping apart totally in strong with weak accuse, it is fast to export contactless, noiselessness, sparkless, switching speed, output circuit damages solid state relay in order to prevent excessive pressure in the twinkling of an eye, it is very little that the zero passage triggers the interference to external world of type solid state relay.

Description

The internal circuit of zero passage output type ac solid relay

Technical field

The utility model relates to a kind of circuit of solid-state relay, especially a kind of internal circuit of zero passage output type ac solid relay.

Background technology

Solid-state relay is a kind of novel noncontacting switch device be all made up of solid state electrical components, it utilizes the switching characteristic of electronic component (as the semiconductor device such as switch triode, bidirectional triode thyristor), can reach the object of contactless no-spark ground make-and-break contact, be therefore otherwise known as " noncontacting switch ".It comes out in 20 century 70s, due to its non-contact work characteristic, makes its automatically controlled and computer control aspect in a lot of fields obtain the application of day by day wide model, therefore the interior circuit of the good ac solid relay of design con-trol performance is necessary.

Utility model content

The technical problems to be solved in the utility model is: based on the problems referred to above, the internal circuit of the zero passage output type ac solid relay providing a kind of control performance good.

The utility model solves the technical scheme that its technical problem adopts: a kind of internal circuit of zero passage output type ac solid relay, comprise input circuit, buffer circuit and output circuit, described input circuit is by input resistance R1, LED and protection diode VD1 composition, described buffer circuit is by photoelectrical coupler IC1, divider resistance R2, divider resistance R3, drive resistance R4, triode V1, controllable silicon SCR, rectifier, divider resistance R5, resistance R6 and bidirectional triode thyristor BTA is driven to form, described output circuit is by electric capacity C1, output resistance R7 and adjustable resistor R8 forms, electric capacity C1 connects with output resistance, electric capacity C1 and the output resistance R7 of series connection are in parallel with adjustable resistor R8.

Further, the base stage of described triode V1 is connected with divider resistance R2, the collector electrode of triode V1 is connected with and drives resistance R4.

The beneficial effects of the utility model are:

1. input control voltage is low, and drive current is little, input control voltage and TTL, DTL, HTL level compatibility, and direct current or pulse voltage all can make input control voltage;

2. adopt Phototube Coupling, can realize while strong with weak control, accomplish forceful electric power and light current completely isolated;

3. output non-contact, noiselessness, no-spark, switching speed are fast;

4. output circuit damages solid-state relay to prevent moment overvoltage;

5. the interference to external world of zero cross fired type solid-state relay is very little.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the utility model is further illustrated.

Fig. 1 is structural representation of the present utility model.

In figure: 1. input circuit, 2. buffer circuit, 3. output circuit.

Embodiment

By reference to the accompanying drawings the utility model is described in further detail now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present utility model are described in a schematic way, and therefore it only shows the formation relevant with the utility model.

As shown in Figure 1, a kind of internal circuit of zero passage output type ac solid relay, comprise input circuit 1, buffer circuit 2 and output circuit 3, input circuit 1 is by input resistance R1, LED and protection diode VD1 composition, buffer circuit 2 is by photoelectrical coupler IC1, divider resistance R2, divider resistance R3, drive resistance R4, triode V1, controllable silicon SCR, rectifier, divider resistance R5, resistance R6 and bidirectional triode thyristor BTA is driven to form, the base stage of triode V1 is connected with divider resistance R2, the collector electrode of triode V1 is connected with and drives resistance R4, output circuit 3 is by electric capacity C1, output resistance R7 and adjustable resistor R8 forms, electric capacity C1 connects with output resistance, electric capacity C1 and the output resistance R7 of series connection are in parallel with adjustable resistor R8.

After input circuit control end adds signal, in photoelectrical coupler IC1, phototriode is conducting state, and input resistance R1 carries out current limliting to input signal, to ensure the unlikely damage of optical coupler IC1.LED indicative input end control signal, protection diode VD1 can prevent from connecing inverse time to protect optical coupler IC1 when input signal positive-negative polarity.

Triode V1 plays alternating voltage detection effect in the line, make that solid-state relay is opened when voltage zero-cross, load current time turn off.

When photoelectrical coupler IC1 phototriode ends (during the input of control end no signal), triode V1 obtains base current by divider resistance R2 and makes it saturation conduction, thus make controllable silicon SCR gate trigger voltage be in off state by pincers at electronegative potential, finally cause bidirectional triode thyristor BTA drive triggerless pulse on resistance R6 at gate pole control end and be in off state;

When photoelectrical coupler IC1 phototriode conducting (when control end has signal to input), the operating state of controllable silicon SCR determines its operating state by alternating voltage detection transistor V1 at zero point, if supply voltage is through divider resistance R2 and divider resistance R3 dividing potential drop, when A place voltage is greater than zero passage voltage, triode V1 is in saturation conduction state, and controllable silicon SCR and bidirectional triode thyristor BTA are in off state; If supply voltage is through divider resistance R2 and divider resistance R3 dividing potential drop, when A place voltage is less than zero passage voltage, triode V1 is in cut-off state, controllable silicon SCA conducting by driving resistance R4 acquisition triggering signal, thus make bidirectional triode thyristor BTA on driving resistance R6, also obtain triggering signal and be conducting state, carry out shutoff to load power source to control, control end signal pass time like this to have no progeny, load current can turn off when being also decreased to the maintenance electric current of bidirectional triode thyristor BTA thereupon voluntarily, cuts off load power source.

With above-mentioned according to desirable embodiment of the present utility model for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this utility model technological thought, can carry out various change and amendment completely.The technical scope of this utility model is not limited to the content on specification, must determine its technical scope according to right.

Claims

1. the internal circuit of a zero passage output type ac solid relay, it is characterized in that: comprise input circuit (1), buffer circuit (2) and output circuit (3), described input circuit (1) is by input resistance R1, LED and protection diode VD1 composition, described buffer circuit (2) is by photoelectrical coupler IC1, divider resistance R2, divider resistance R3, drive resistance R4, triode V1, controllable silicon SCR, rectifier, divider resistance R5, resistance R6 and bidirectional triode thyristor BTA is driven to form, described output circuit (3) is by electric capacity C1, output resistance R7 and adjustable resistor R8 forms, electric capacity C1 connects with output resistance, electric capacity C1 and the output resistance R7 of series connection are in parallel with adjustable resistor R8.

2. the internal circuit of zero passage output type ac solid relay according to claim 1, is characterized in that: the base stage of described triode V1 is connected with divider resistance R2, and the collector electrode of triode V1 is connected with and drives resistance R4.