Solid-state relay convenient to use

Abstract

The utility model relates to the technical field of relays, in particular to a solid-state relay convenient to use. The circuit comprises a control end and an output end, the control end is adaptively connected with the output end, and the control end receives a control signal to control conduction of the output end. The circuit is characterized in that a switch is arranged in the control end, when the switch is switched off, a control signal cannot be input into the control end, the output end is always in an open-circuit state, and when the switch is switched on, the control end receives the control signal to control the output end to be switched on. The testing process of the relay is high in efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to a relay technology field, specifically say a solid state relay convenient to use. BACKGROUND

[0002] Solid state relay (SOLID STATE RELAYS) is a new type of non-contact switching device composed of solid state electronic elements, which uses the switching characteristics of electronic elements (such as switching triode, bidirectional thyristor and other semiconductor devices) to achieve the purpose of turning on and off the circuit without contact and spark, so it is also called "non-contact switch". When the solid state relay is tested, the positive electrode of the control end is generally connected to the power supply, and the negative electrode of the control end is connected to the ground. The light-emitting diode of the solid state relay isolation optocoupler is driven by the power of the power supply to produce light, and then the phototriode of the solid state relay isolation optocoupler is turned on, and the controlled end is turned on.

[0003] The utility model discloses a kind of solid state relays in the Chinese utility model patent with disclosure number CN212969597U. It includes first optocoupler, second optocoupler, power switching device, integral circuit and voltage limiting circuit. When this kind of solid state relay is tested, its control end positive pole is connected with power supply through plug connector, when needing to interrupt control signal, the plug between control end positive pole and power supply needs to be pulled out, when needing control signal next time, it is inserted again, repeatedly plugs and pulls, and efficiency is low. UTILITY MODEL CONTENT

[0004] The utility model solves the technical problem to provide a kind of solid state relay convenient to use, and the test process efficiency of the relay is high.

[0005] To solve the above problems, the following technical solutions are provided:

[0006] The utility model discloses a kind of solid state relays convenient to use, including control end and output end, the control end is connected with output end adaptation, control end receives control signal control output end conduction. Its characteristics are, there is switch in the control end, when switch is off, control signal cannot be input into control end, output end is always in open circuit state, when switch is closed, control end receives control signal control output end conduction.

[0007] The control end includes the diode end of isolation optocoupler U1, the positive pole of the diode end of isolation optocoupler U1 is connected with the one end of resistance R1 and the negative pole of diode D1 respectively, the other end of resistance R1 is connected with the positive pole of the control end after the switch, the positive pole of diode D1 and the negative pole of the diode end of isolation optocoupler U1 are connected with the negative pole of the control end;The positive pole of the control end is used to receive control signal.

[0008] The switch contains MOS tube Q1, the positive pole of the control end is connected with the source pole of MOS tube Q1, one end of resistance R8 and one end of resistance R9 respectively; the other end of resistance R8 is connected with the drain pole of MOS tube Q2, one end of resistance R10 and the gate pole of MOS tube Q3 respectively, the other end of resistance R9 is connected with the drain pole of MOS tube Q3, the other end of resistance R10 is connected with the upper pole plate of capacitor C1; the gate pole of MOS tube Q2 is connected with one end of resistance R11 and one end of button SW1 respectively, the other end of button SW1 is connected with the upper pole plate of capacitor C1, the other end of resistance R11 is connected with the drain pole of MOS tube Q3; the drain pole of MOS tube Q3 is connected with the gate pole of MOS tube Q1; the source pole of MOS tube Q2, the lower pole plate of capacitor C1 and the source pole of MOS tube Q3 are all grounded; the drain pole of MOS tube Q1 is connected with the positive pole of the diode end of the isolation photoelectric coupler U1 through resistance R1.

[0009] The drain pole of MOS tube Q1 is connected with one end of resistance R12, and the other end of resistance R12 is grounded through light emitting diode D2.

[0010] The output end includes the triode end of the isolation photoelectric coupler U1, and the output end contains an amplification circuit and a switching triode V4, the amplification circuit is connected with the triode end of the isolation photoelectric coupler U1 and the switching triode V4, and the amplification circuit is used for amplifying the isolation signal generated by the triode end of the isolation photoelectric coupler U1 so as to control the switching triode V4 to be turned on.

[0011] The above scheme has the following advantages:

[0012] Since the control end of the solid-state relay convenient to use has a switch, when the switch is turned off, the control signal cannot be input into the control end, and the output end is always in an open circuit state; when the switch is turned on, the control end receives the control signal to control the output end to be turned on. The scheme has the switch connected in series in the control end, and when the control signal needs to be interrupted, the switch can be used to interrupt the control signal, without the need of unplugging the switch; when the control signal needs to be controlled next time, the switch can be turned on, without the need of repeatedly plugging and unplugging the socket, so that the working efficiency of the test is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a circuit schematic diagram of the solid-state relay convenient to use of the utility model;

[0014] Figure 2 is a circuit schematic diagram of the switch in the solid-state relay convenient to use of the utility model. DETAILED DESCRIPTION

[0015] The utility model will be further explained in detail in combination with the drawings.

[0016] AsFigure 1 As shown in the utility model, the solid-state relay convenient to use comprises a control end and an output end, the control end is adaptively connected with the output end, the control end receives a control signal to control the output end to be turned on. The control end has a switch, when the switch is turned off, the control signal cannot be input into the control end, and the output end is always in an open circuit state; when the switch is turned on, the control end receives the control signal to control the output end to be turned on. The switch is connected in series in the control end, and when the control signal needs to be interrupted, the switch can be used to interrupt the control signal, and the switch does not need to be unplugged; when the control signal is needed next time, the switch can be turned on, and the socket does not need to be repeatedly plugged and unplugged, thereby greatly improving the working efficiency of testing

[0017] As Figure 1 shown, the output end comprises a triode end of an isolation optocoupler U1, the output end comprises an amplification circuit and a switching triode V4, the amplification circuit is adaptively connected with the triode end of the isolation optocoupler U1 and the switching triode V4, and the amplification circuit is used for amplifying an isolation signal generated by the triode end of the isolation optocoupler U1 to control the switching triode V4 to be turned on. The amplification circuit adopts a triode amplification circuit, and the specific structure is shown on the right side, which belongs to the prior art and will not be described herein. Figure 1

[0018] As Figure 1 and Figure 2 ​As shown, the control end includes the diode end of the isolation optocoupler U1, the positive terminal of the diode end of the isolation optocoupler U1 is connected with one end of the resistor R1 and the negative terminal of the diode D1 respectively, the other end of the resistor R1 is connected with the positive terminal of the control end through a switch, the positive terminal of the diode D1 and the negative terminal of the diode end of the isolation optocoupler U1 are connected with the negative terminal of the control end. The positive terminal of the control end is used for receiving a control signal. The switch contains the MOS tube Q1, the positive terminal of the control end is connected with the source of the MOS tube Q1, one end of the resistor R8 and one end of the resistor R9 respectively, in the embodiment, the positive terminal of the control end is connected with VCC, and Q1 is a P-channel enhancement mode MOS tube. The other end of the resistor R8 is connected with the drain of the MOS tube Q2, one end of the resistor R10 and the gate of the MOS tube Q3 respectively, the other end of the resistor R9 is connected with the drain of the MOS tube Q3, and the other end of the resistor R10 is connected with the upper plate of the capacitor C1. The gate of the MOS tube Q2 is connected with one end of the resistor R11 and one end of the button SW1 respectively, the other end of the button SW1 is connected with the upper plate of the capacitor C1, and the other end of the resistor R11 is connected with the drain of the MOS tube Q3. The drain of the MOS tube Q3 is connected with the gate of the MOS tube Q1. The source of the MOS tube Q2, the lower plate of the capacitor C1 and the source of the MOS tube Q3 are grounded. The drain of the MOS tube Q1 is the OUT end, which is connected with the positive terminal of the diode end of the isolation optocoupler U1 through the resistor R1, and the MOS tube Q1 and the MOS tube Q2 form a bistable circuit. Due to the effect of C1, Q1 is first turned on and Q2 is cut off at power-on, and if the button SW1 is not pressed, the circuit will maintain this state. Because Q2 is cut off, Q1 is also cut off, and the control end of the isolation optocoupler U1 cannot obtain power supply. At this time, the drain of Q2 is low, and the voltage on C1 is also low. When the button SW1 is pressed, the gate of Q2 is pulled to low by C1, and Q2 is quickly cut off. Q3 starts to conduct, and the state of the circuit is reversed. After Q3 is turned on, the gate of Q1 is pulled to low, and Q1 is turned on. VCC supplies power to the control end of the isolation optocoupler U1 through Q1. After Q3 is turned on, C1 is charged through R1 and R4, and the voltage rises. When the button SW1 is pressed again at this time, the voltage of C1 is added to the gate of Q2, Q2 is turned on, the drain of Q2 is low, and Q3 is forced to be cut off through R3, and Q3 is also cut off, realizing power-off. The anti-interference ability of the control end is provided by the bistable state, and the stability of the whole relay is high

[0019] Figure 2 As shown, in the embodiment, the drain of the MOS tube Q1 is connected with one end of the resistor R12, and the other end of the resistor R12 is connected with the ground through the light emitting diode D2. Whether the MOS tube Q1 is in the conducting state can be observed by using the light emitting diode D2.

Claims

1. A solid state relay convenient to use, comprising a control end and an output end, the control end and the output end are adaptively connected, the control end receives a control signal to control the output end to be turned on; characterized in that, The control end has a switch, when the switch is off, the control signal cannot be input into the control end, the output end is always in open circuit state, when the switch is on, the control end receives the control signal to control the output end to be on; the control end includes the diode end of the isolation optocoupler U1, the positive pole of the diode end of the isolation optocoupler U1 is connected with one end of the resistor R1 and the negative pole of the diode D1 respectively, the other end of the resistor R1 is connected with the positive pole of the control end through the switch, the positive pole of the diode D1 and the negative pole of the diode end of the isolation optocoupler U1 are both connected with the negative pole of the control end; the positive pole of the control end is used for receiving the control signal.

2. The solid state relay of claim 1, wherein, The switch contains the MOS tube Q1, the positive pole of the control end is connected with the source pole of the MOS tube Q1, one end of the resistor R8 and one end of the resistor R9 respectively; the other end of the resistor R8 is connected with the drain pole of the MOS tube Q2, one end of the resistor R10 and the gate pole of the MOS tube Q3 respectively, the other end of the resistor R9 is connected with the drain pole of the MOS tube Q3, the other end of the resistor R10 is connected with the upper pole plate of the capacitor C1; the gate pole of the MOS tube Q2 is connected with one end of the resistor R11 and one end of the button SW1 respectively, the other end of the button SW1 is connected with the upper pole plate of the capacitor C1, the other end of the resistor R11 is connected with the drain pole of the MOS tube Q3; the drain pole of the MOS tube Q3 is connected with the gate pole of the MOS tube Q1; the source pole of the MOS tube Q2, the lower pole plate of the capacitor C1 and the source pole of the MOS tube Q3 are all grounded; the drain pole of the MOS tube Q1 is connected with the positive pole of the diode end of the isolation optocoupler U1 through the resistor R1.

3. The solid state relay of claim 2, wherein the solid state relay is configured to be activated by a voltage of 3.3 volts. The drain pole of the MOS tube Q1 is connected with one end of the resistor R12, the other end of the resistor R12 is grounded through the light emitting diode D2.

4. The easy-to-use solid state relay of claim 1, wherein, The output end includes the triode end of the isolation optocoupler U1, the output end contains the amplification circuit and the switching triode V4, the amplification circuit is connected with the triode end of the isolation optocoupler U1 and the switching triode V4, the amplification circuit is used for amplifying the isolation signal generated by the triode end of the isolation optocoupler U1, so as to control the switching triode V4 to be on.

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