Switch control circuit

Abstract

The utility model relates to a switch control circuit, comprising a connecting terminal, the connecting terminal comprises a first power supply end, a first contact end and a second contact end, the first power supply end is used for supplying power to an indicating lamp of a button switch; the first end of the isolation optocoupler unit is an anode and is used for being connected with a first power supply, the second end of the isolation optocoupler unit is a cathode and is electrically connected with the first contact end through a second resistor, the third end of the isolation optocoupler unit is a collector electrode, and the fourth end of the isolation optocoupler unit is an emitter electrode; the emitter of the isolation optocoupler unit is used for outputting a voltage control signal; the triode control unit is electrically connected with the fourth end of the isolation optocoupler unit and is used for receiving the voltage control signal of the isolation optocoupler unit and generating a switch control signal; and the relay is used for receiving the switch control signal output by the triode control unit to act, can control the indicator lamp of the button switch, and is simple, safe and reliable.

Description

Technical Field

[0001] This utility model relates to the field of switch control circuit. Background Technology

[0002] Some push-button switches are equipped with indicator lights, but the push-button switch itself does not have a control circuit, so it cannot make the indicator light light up when the button is pressed and turn off when the push-button switch is opened. Utility Model Content

[0003] This invention proposes a switch control circuit that can control both the push-button switch and its indicator light simultaneously, enabling the indicator light to illuminate when the push-button switch is pressed and to turn off when the push-button switch is released.

[0004] A connection terminal is used for electrical connection with a push-button switch. The connection terminal includes a first power supply terminal, a first contact terminal, and a second contact terminal. The first power supply terminal is used to supply power to the indicator light of the push-button switch.

[0005] An isolation optocoupler unit has an anode at its first end, which is used to connect to a first power supply; a cathode at its second end, which is electrically connected to a first contact end through a second resistor; a collector at its third end; and an emitter at its fourth end. The emitter of the isolation optocoupler unit is used to output a voltage control signal.

[0006] The transistor control unit is electrically connected to the fourth terminal of the isolation optocoupler unit and is used to receive the voltage control signal from the isolation optocoupler unit and generate the switching control signal.

[0007] A relay is used to receive a switching control signal output by a transistor control unit to perform an action. The first input terminal of the relay is electrically connected to the transistor control unit, the second input terminal of the relay is used to connect to a second power supply, and the first voltage output terminal of the relay is electrically connected to a first power supply terminal.

[0008] In one embodiment, the first contact is a normally open contact.

[0009] In one embodiment, the second contact terminal is a common contact terminal.

[0010] In one embodiment, the transistor control unit includes a transistor switch, a second resistor, and a diode; the base of the transistor switch is electrically connected to the fourth terminal of the isolation optocoupler unit through the second resistor, the emitter of the transistor switch is grounded, the collector of the transistor switch is electrically connected to one end of the diode and the first input terminal of the relay, and the other end of the diode is used to be electrically connected to a second power supply.

[0011] In one embodiment, the fourth terminal of the isolation optocoupler unit is also grounded through a third resistor.

[0012] In one embodiment, the voltage of the first power supply is lower than the voltage of the second power supply.

[0013] In one embodiment, the connection terminal further includes a second power supply terminal, which is grounded.

[0014] In one embodiment, the second contact terminal is connected to the second power supply terminal via a fourth resistor.

[0015] The aforementioned switch control circuit, through the cooperation of an isolation optocoupler unit, a transistor control unit, and a relay, achieves isolation between the internal power supply of the push-button switch and the power supply of the push-button switch indicator light. It can also control the push-button switch indicator light while controlling the push-button switch, enabling the indicator light to light up when the button is pressed and turn off when the button is released. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the circuit structure of an embodiment of the subject matter of this utility model.

[0017] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0019] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0020] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0021] Furthermore, descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only (e.g., to distinguish identical or similar elements) and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, technical solutions from different embodiments can be combined, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, such a combination should be considered nonexistent and not within the scope of protection claimed by this utility model.

[0022] like Figure 1 As shown, this utility model proposes a switch control circuit 10, comprising:

[0023] The connection terminal 11 is used for electrical connection with the push button switch 12. The connection terminal 11 includes a first power supply terminal 12V_COM1, a first contact terminal NC, and a second contact terminal COM. The first power supply terminal 12V_COM1 is used to supply power to the indicator light of the push button switch 12.

[0024] The isolation optocoupler unit 13 has the following characteristics: its first terminal, +5V_COM, is the anode and is used to connect to the first power supply; its second terminal is the cathode and is electrically connected to the first contact terminal NC through the first resistor R1; its third terminal is the collector, which is externally connected to the +5V power supply; and its fourth terminal is the emitter, which is used to output a voltage control signal.

[0025] In one embodiment, the emitter of the isolation optocoupler unit 13 is used to connect to a DSP control chip to control external devices via the DSP chip.

[0026] The main function of the push-button switch 12 is to control the machine to turn on or off (equivalent to an emergency stop button); by controlling the push-button switch 12 to connect or disconnect, the DI (dry contact input signal) is transmitted to the DSP control chip, thereby controlling the machine to start or stop.

[0027] The transistor control unit 14 is electrically connected to the fourth terminal of the isolation optocoupler unit 13 and is used to receive the voltage control signal from the isolation optocoupler unit 13 and generate a switching control signal.

[0028] Relay 15 is used to receive the switching control signal output by transistor control unit 14 to perform the action. The first input terminal A2 of relay 15 is electrically connected to transistor control unit, the second input terminal A1 of relay 15 is used to connect to second power supply, and the first voltage output terminal T1 of relay 15 is electrically connected to first power supply terminal 12V_COM1.

[0029] When the terminal connected to the first contact NC and the terminal connected to the second contact COM in the push-button switch are pressed simultaneously, the isolation optocoupler unit 13 starts to work. The fourth terminal of the isolation optocoupler unit 13 outputs a high-level voltage control signal to the transistor control unit 14. The transistor control unit 14 is turned on, the coil in the relay 15 is energized, the first voltage output terminal T1 of the relay is energized, and the entire push-button switch 12 is lit.

[0030] When the terminals connected to the first contact terminal NC and the second contact terminal COM in the push-button switch are not pressed simultaneously, the isolation optocoupler unit 13 does not work. The fourth terminal of the isolation optocoupler unit 13 outputs a low-level voltage control signal to the transistor control unit 14. The transistor control unit 14 is turned off, the coil in the relay 15 is de-energized, the first voltage output terminal T1 of the relay is de-energized, and the entire push-button switch 12 is turned off.

[0031] Among them, relay contact P1 of relay 15 is used to output 12V power for power supply.

[0032] The aforementioned switch control circuit 10, through the cooperation of the isolation optocoupler unit 13, the transistor control unit 14, and the relay 15, achieves the isolation between the internal power supply of the push button switch 12 and the power supply of the push button switch indicator light. It can also control the push button switch indicator light while controlling the push button switch 12, so that the indicator light lights up when the push button switch 12 is pressed and turns off when the push button switch 12 is opened.

[0033] In one embodiment, the second power source is a +12V voltage source.

[0034] In one embodiment, the first contact terminal NC is a normally open contact.

[0035] In one embodiment, the second contact terminal COM is a common contact terminal.

[0036] In one embodiment, the transistor control unit 14 includes a transistor switch Q1, a second resistor R2, and a diode D1.

[0037] The base of transistor switch Q1 is electrically connected to the fourth terminal of isolation optocoupler unit 13 through the second resistor R2. The emitter of transistor switch Q1 is grounded. The collector of transistor switch Q1 is electrically connected to one end of diode D1 and the first input terminal A1 of relay 15, respectively. The other end of diode D1 is used to electrically connect to the second power supply.

[0038] In one embodiment, the fourth terminal of the isolation optocoupler unit 13 is also grounded through a third resistor R3.

[0039] In one embodiment, the voltage of the first power supply is lower than the voltage of the second power supply.

[0040] In one embodiment, the connection terminal 11 further includes a second power supply terminal GND_COM, which is grounded.

[0041] In one embodiment, the second contact terminal COM is connected to the second power supply terminal GND_COM via a fourth resistor R4.

[0042] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A switch control circuit, characterized in that, include: A connection terminal is provided for electrical connection with a push-button switch. The connection terminal includes a first power supply terminal, a first contact terminal, and a second contact terminal. The first power supply terminal is used to supply power to the indicator light of the push-button switch. An isolation optocoupler unit, wherein the first end of the isolation optocoupler unit is an anode and is used to connect to a first power supply, the second end of the isolation optocoupler unit is a cathode and is electrically connected to the first contact end through a first resistor, the third end of the isolation optocoupler unit is a collector, and the fourth end of the isolation optocoupler unit is an emitter. The emitter of the isolation optocoupler unit is used to output a voltage control signal. The transistor control unit is electrically connected to the fourth terminal of the isolation optocoupler unit and is used to receive the voltage control signal from the isolation optocoupler unit and generate a switching control signal. A relay is used to receive a switching control signal output by the transistor control unit to perform an action. The first input terminal of the relay is electrically connected to the transistor control unit, the second input terminal of the relay is used to connect to a second power supply, and the first voltage output terminal of the relay is electrically connected to the first power supply terminal.

2. The switch control circuit according to claim 1, characterized in that, The first contact end is a normally open contact.

3. The switch control circuit according to claim 2, characterized in that, The second contact terminal is the common contact terminal.

4. The switch control circuit according to claim 1, characterized in that, The transistor control unit includes a transistor switch, a second resistor, and a diode; The base of the transistor switch is electrically connected to the fourth terminal of the isolation optocoupler unit through the second resistor. The emitter of the transistor switch is grounded. The collector of the transistor switch is electrically connected to one end of the diode and the first input terminal of the relay, respectively. The other end of the diode is used to electrically connect to the second power supply.

5. The switch control circuit according to claim 1, characterized in that, The fourth terminal of the isolation optocoupler unit is also grounded through a third resistor.

6. The switch control circuit according to claim 1, characterized in that, The voltage of the first power source is less than the voltage of the second power source.

7. The switch control circuit according to claim 1, characterized in that, The connection terminal also includes a second power supply terminal, which is grounded.

8. The switch control circuit according to claim 7, characterized in that, The second contact terminal is connected to the second power supply terminal through the first resistor.

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