CN214851182U

CN214851182U - Low-power consumption direct current opto-coupler isolator

Info

Publication number: CN214851182U
Application number: CN202121254562.0U
Authority: CN
Inventors: 殷晨钟; 陈志翔; 吕炎
Original assignee: Jiangsu Gold Electrical Control Technology Co ltd
Current assignee: Jiangsu Gold Electrical Control Technology Co ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2021-11-23
Anticipated expiration: 2031-06-04

Abstract

The utility model relates to a low-power consumption direct current optical coupling isolating switch, which comprises an optical coupling isolating circuit; the input port of the signal processing circuit is used as the input port of the isolating switch; the output port of the signal processing circuit is connected to the input port of the optical coupling isolation circuit; the output port of the optical coupling isolation circuit is connected to the input port of the switching tube circuit; the switching tube circuit comprises a plurality of switching tube elements; the control ends of the switch tube elements receive output signals of the optical coupling isolation circuit, the first poles of the switch tube elements are connected together to serve as an anode output port of the isolation switch, and the second poles of the switch tube elements are connected together to serve as a cathode output port of the isolation switch. The utility model discloses keep apart withstand voltage height, the interference killing feature is strong.

Description

Low-power consumption direct current opto-coupler isolator

Technical Field

The utility model relates to an electronic circuit field, concretely relates to low-power consumption direct current opto-coupler isolator.

Background

The switch is an indispensable electrical device in the industry chain of daily factories and is also an essential device for driving small-power machines such as lighting, fans and the like in daily life. Larger electric machines such as air conditioners, refrigerators, salt fog testers and the like need to use relays to realize switching functions, and particularly, the relays are basically controlled on industrial electric machines. Electromagnetic relays are now more commonly used. However, the electromagnetic relay has the defects of short service life, high noise, low control power and the like.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model discloses a low-power consumption direct current opto-coupler isolator.

The utility model discloses the technical scheme who adopts as follows:

a low-power consumption direct current optical coupling isolating switch comprises an optical coupling isolating circuit; the input port of the signal processing circuit is used as the input port of the isolating switch; the output port of the signal processing circuit is connected to the input port of the optical coupling isolation circuit; the output port of the optical coupling isolation circuit is connected to the input port of the switching tube circuit; the switching tube circuit comprises a plurality of switching tube elements; the control ends of the switch tube elements receive output signals of the optical coupling isolation circuit, the first poles of the switch tube elements are connected together to serve as an anode output port of the isolation switch, and the second poles of the switch tube elements are connected together to serve as a cathode output port of the isolation switch.

The further technical scheme is as follows: the switching tube circuit comprises a first switching tube element and a second switching tube element; the control end of the first switch tube element and the control end of the second switch tube element both receive output signals of the optical coupling isolation circuit; a first pole of the first switch tube element is used as an anode output port of the isolating switch, and a second pole of the first switch tube element is used as a cathode output port of the isolating switch; the first and second poles of the second switching tube element are connected to the first and second poles of the first switching tube element, respectively.

The further technical scheme is as follows: the switching tube element is an MOS tube, the control end of the switching tube element is a gate pole, the first pole is a source pole, the second pole is a drain pole, or the first pole is a drain pole, and the second pole is a source pole.

The further technical scheme is as follows: the signal processing circuit is a constant current circuit.

The further technical scheme is as follows: the signal processing circuit comprises a first triode and a second triode; the first end of the first resistor is connected with the first input end of the isolating switch, the second end of the first resistor is connected with the first pole of the first triode, the second pole of the first triode is connected with the second input end of the isolating switch, and the two ends of the fourth resistor are respectively connected with the base electrode and the second pole of the first triode; the base electrode of the second triode is connected with the first electrode of the first triode, the first electrode of the second triode is connected with the second end of the second resistor, the first end of the second resistor is connected with the first input end of the isolating switch, and the two ends of the fifth resistor are connected in parallel with the first electrode and the second electrode of the second triode; the first end of the eighth resistor is connected with the first pole of the second triode, and the second end of the eighth resistor is used as the second output end of the signal processing circuit; the first end of the second resistor is used as the first output end of the signal processing circuit.

The further technical scheme is as follows: the optocoupler isolation circuit includes a plurality of optocoupler elements connected in series with one another.

The further technical scheme is as follows: the switch tube circuit also comprises a plurality of current-limiting resistors which are in one-to-one correspondence with the switch tube elements; the current limiting resistor is connected between the control end of the switch tube and the output end of the optical coupling isolation circuit.

The further technical scheme is as follows: the switch tube circuit comprises a switch tube reverse connection prevention device; the switch tube reverse connection preventing device comprises a first diode; the anode of the first diode is connected with the second pole of the switching tube element; the cathode of the first diode is connected to the control end of the switching tube element.

The further technical scheme is as follows: the system also comprises a user side reverse connection prevention device; the device for preventing the terminal from being reversely connected comprises a second diode; the anode of the second diode is connected with the cathode output end of the isolating switch; the cathode of the second diode is connected with the anode output end of the isolating switch.

A series circuit of the low-power-consumption direct current optical coupling isolating switch is installed, and an output port of the isolating switch is connected with a user load and a user power supply in series.

The utility model has the advantages as follows:

the utility model provides a circuit structure is the solid state relay structure that uses the opto-coupler as the isolation, and its control signal required power is extremely low, and corresponding consumption is also very low, consequently can be with weak signal control strong current. And the front-end input of the optical coupling isolation circuit is isolated from the output of the rear end. The circuit before the opto-coupler isolation circuit input port, the numerical value of voltage and electric current is all very little, and operating personnel can directly touch and operating signal, does not have danger, and circuit after the opto-coupler isolation circuit, voltage or electric current are all very big, belong to high current or high voltage circuit, and operating personnel touching can lead to danger, the utility model discloses keep apart low pressure part and high-pressure part, at first can protect the user load, secondly can reduce the danger of operating personnel contact. The optical coupler is in unidirectional transmission, so that unidirectional transmission of signals can be realized, the input end and the output end are completely electrically isolated, the output signals have no influence on the input end, the anti-interference capability is strong, and the work is stable; the optical coupler is photoelectric, so that the service life is long, and the defect that a mechanical contact has the suction times is overcome.

The utility model discloses an opto-coupler isolation circuit, a plurality of opto-coupler elements of preferred series connection, this is because the utility model discloses probably be applicable to various control occasions, in some control occasions, when control signal switches on, produce surge current easily, also the electric current can increase in the twinkling of an eye, a plurality of opto-coupler elements, the electric current bearing capacity is high, and is not fragile. The switching tube circuit of the present invention also preferably has a plurality of switching tube elements connected in parallel, which is also performed for the case of a large current. So the utility model is applicable to various occasions.

Drawings

Fig. 1 is a schematic diagram of the circuit structure of the present invention.

Fig. 2 is a schematic view of the usage state of the present invention.

In the figure: 1. a signal processing circuit; 11. a first resistor; 12. a first triode; 13. a second triode; 14. a fourth resistor; 15. a fifth resistor; 16. an eighth resistor; 17. a second resistor; 18. a light emitting diode; 2. an opto-coupler isolation circuit; 21. a first light coupling element; 22. a second light coupling element; 3. a switching tube circuit; 31. a first switching tube element; 32. a second switching tube element; 33. a sixth resistor; 34. a seventh resistor; 35. a first diode; 4. a second diode.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

Fig. 1 is a schematic diagram of the circuit structure of the present invention. As shown in fig. 1, the low power consumption dc optical coupling isolation switch includes a signal processing circuit 1, an optical coupling isolation circuit 2 and a switching tube circuit 3.

The input port of the signal processing circuit 1 serves as the input port of the isolating switch. An output port of the signal processing circuit 1 is connected to an input port of the optical coupling isolation circuit 2. The output port of the optical coupling isolation circuit 2 is connected to the input port of the switching tube circuit 3. The output port of the switching tube circuit 3 is used as the output port of the isolating switch.

The input port of the isolating switch is used for inputting a direct current control signal. The output port of the isolating switch is connected with the user circuit. The signal processing circuit 1 is configured to perform preliminary processing on the control signal as required, for example, amplification, filtering, current limiting, and the like, and in this embodiment, the signal processing circuit 1 is configured to stabilize the input signal, and specifically, to limit the input current. The optical coupling isolation circuit 2 is used for isolating the control signal from the user circuit, preventing mutual influence between the input end and the output end, and particularly isolating the high voltage of the output end from the input end for operation. The switching tube circuit 3 is used for receiving the control signal and switching off or on the user circuit.

In the embodiment shown in fig. 1, the signal processing circuit 1 is a constant current circuit. The signal processing circuit 1 comprises a first transistor 12 and a second transistor 13. A first end of the first resistor 11 is connected to a first input end of the isolating switch, a second end of the first resistor 11 is connected to a first pole of the first triode 12, a second pole of the first triode 12 is connected to a second input end of the isolating switch, and two ends of the fourth resistor 14 are respectively connected to a base and a second pole of the first triode 12. The base of the second triode 13 is connected with the first pole of the first triode 12, the first pole of the second triode 13 is connected with the second end of the second resistor 17, the first end of the second resistor 17 is connected with the first input end of the isolating switch, and the two ends of the fifth resistor 15 are connected in parallel with the first pole and the second pole of the second triode 13. A first end of an eighth resistor 16 is further connected to a common end of the second transistor 13 and the second resistor 17, a second end of the eighth resistor 16 is used as a second output end of the signal processing circuit 1, and a first end of the second resistor 17 is used as a first output end of the signal processing circuit 1.

In this embodiment, the first transistor 12 and the second transistor 13 are both NPN transistors, the first electrode is a collector, and the second electrode is an emitter. Alternatively, the first transistor 12 and the second transistor 13 may also be PNP transistors, with the first electrode being an emitter and the second electrode being a collector.

When the current is small, the base voltage of the second triode 13 is small, the second triode 13 is not conducted, and the output port of the signal processing circuit 1 outputs the current. When the current is large, due to the existence of the first resistor 11, the base voltage of the second triode 13 becomes large, the second triode 13 is conducted, the output current of the output port of the signal processing circuit 1 becomes small, and the circuit cannot be damaged due to the fact that the current is too large. Preferably, a light emitting diode 18 is further included, which is connected in series with the second resistor 17 to indicate the phenomenon of excessive current.

The opto-coupler isolation circuit 2 includes a plurality of opto-coupler elements connected in series with each other. As shown in fig. 1, the light coupling isolation circuit 2 includes a first light coupling element 21 and a second light coupling element 22. A second input of the first light coupling element 21 is connected to a first input of the second light coupling element 22. A first input terminal of the first optical coupler element 21 and a second input terminal of the second optical coupler element 22 serve as input terminals of the optical coupler isolation circuit 2. A second output of the first optocoupler element 21 is connected to a second input of the second optocoupler element 22. A first output end of the first optical coupler element 21 and a second output end of the second optical coupler element 22 are used as output ends of the optical coupler isolation circuit 2. When the input port of the isolating switch inputs a control signal, a large surge current is generated at the moment of circuit connection, so that the components are easily damaged, and the plurality of optical coupling elements are connected together to avoid the damage of the large current to the components of the subsequent circuit.

The switching tube circuit 3 comprises a plurality of switching tube elements. The control ends of the switch tube elements all receive output signals of the optical coupling isolation circuit 2, the first poles of the switch tube elements are all connected together to serve as an anode output port of the isolation switch, and the second poles of the switch tube elements are all connected together to serve as a cathode output port of the isolation switch. In particular, the switching tube circuit 3 comprises a first switching tube element 31 and a second switching tube element 32. The control end of the first switch tube element 31 and the control end of the second switch tube element 32 both receive the output signal of the optical coupler isolation circuit 2. A first pole of the first switching tube element 31 serves as a positive output port of the isolating switch, and a second pole of the first switching tube element 31 serves as a negative output port of the isolating switch. The first and second poles of the second switching transistor element 32 are connected in parallel to the first and second poles of the first switching transistor element 31. The switching tube circuit 3 further comprises a sixth resistor 33 and a seventh resistor 34. Two ends of the sixth resistor 33 are connected between the control end of the first switching tube element 31 and the first output end of the optical coupler isolation circuit 2. Two ends of the seventh resistor 34 are connected between the control end of the second switching tube element 32 and the first output end of the optical coupler isolation circuit 2. In this embodiment, the first switching transistor element 31 is a MOS transistor as shown in fig. 1, the control terminal of the first switching transistor element 31 is a gate, the first electrode is a source, and the second electrode is a drain, or alternatively, the first electrode is a drain and the second electrode is a source. The second switching transistor element 32 is a MOS transistor as shown in fig. 1, the control terminal of the second switching transistor element 32 is a gate, the first electrode is a source, and the second electrode is a drain, or alternatively, the first electrode is a drain and the second electrode is a source.

The switch tube circuit 3 comprises a switch tube reverse connection prevention device. The switch tube reverse connection preventing device comprises a first diode 35. An anode of the first diode 35 is connected to a second pole of the first switching tube element 31. The cathode of the first diode 35 is connected to the control terminal of the first switching transistor element 31. When the switch tube circuit 3 is integrally connected reversely, the output current of the first output end of the first optical coupling isolation circuit 2 directly flows through the first diode 35 without driving the first switch tube element 31 and the second switch tube element 32, so that the working state of wrong connection of the circuit can be prevented.

Further, still include the user side and prevent reverse connection device. The device for terminal reverse connection prevention includes a second diode 4. The anode of the second diode 4 is connected to the negative output terminal of the isolating switch. The cathode of the second diode 4 is connected to the positive output terminal of the isolating switch. If the positive and negative poles of the power supply of the user are connected reversely, the current flows in from the anode of the second diode 4 and flows out from the cathode of the second diode 4, the isolation switch is not affected, and the isolation switch is not damaged.

Fig. 2 is a schematic view of the usage state of the present invention. As shown in fig. 2, in the series circuit mounted with the low power consumption dc optical coupling isolation switch, the output port of the isolation switch is connected in series with the user load and the user power supply. When the input port of the isolating switch has no control signal, the resistance value of the switching tube circuit 3 is large, the user load is in an open circuit state and does not work, when the input port of the isolating switch has the control signal, the resistance value of the switching tube circuit 3 is rapidly reduced to be in a conducting state, the user load and the user power supply form a closed loop, and the user load can work.

In the utility model shown in fig. 1, the circuit before the 2 input ports of opto-coupler isolation circuit, the numerical value of voltage and electric current is all very little, and operating personnel can directly touch and operating signal, does not have danger, and the circuit after 2 opto-coupler isolation circuit, voltage or electric current are all very big, belong to high current or high voltage circuit, and operating personnel touches and can lead to danger, the utility model discloses keep apart low pressure part and high-pressure part, at first can protect user's load, secondly can reduce the danger of operating personnel contact.

The above description is for the purpose of explanation and not limitation of the invention, which is defined in the claims, and any modifications may be made without departing from the basic structure of the invention.

Claims

1. A low-power consumption direct current opto-isolator which characterized in that: the optical coupler isolation circuit comprises an optical coupler isolation circuit (2); an input port of the signal processing circuit (1) is used as an input port of the isolating switch; the output port of the signal processing circuit (1) is connected to the input port of the optical coupling isolation circuit (2); the output port of the optical coupling isolation circuit (2) is connected to the input port of the switching tube circuit (3); the switching tube circuit (3) comprises a plurality of switching tube elements; the control ends of the switch tube elements all receive output signals of the optical coupling isolation circuit (2), the first poles of the switch tube elements are all connected together to serve as the anode output port of the isolation switch, and the second poles of the switch tube elements are all connected together to serve as the cathode output port of the isolation switch.

2. The low-power-consumption direct-current optical coupling isolating switch according to claim 1, characterized in that: the switching tube circuit (3) comprises a first switching tube element (31) and a second switching tube element (32); the control end of the first switching tube element (31) and the control end of the second switching tube element (32) both receive output signals of the optical coupling isolation circuit (2); a first pole of the first switch tube element (31) is used as a positive pole output port of the isolating switch, and a second pole of the first switch tube element (31) is used as a negative pole output port of the isolating switch; the first and second poles of the second switching tube element (32) are connected to the first and second poles of the first switching tube element (31), respectively.

3. The low-power-consumption direct-current optical coupling isolating switch according to claim 1, characterized in that: the switching tube element is an MOS tube, the control end of the switching tube element is a gate pole, the first pole is a source pole, the second pole is a drain pole, or the first pole is a drain pole, and the second pole is a source pole.

4. The low-power-consumption direct-current optical coupling isolating switch according to claim 1, characterized in that: the signal processing circuit (1) is a constant current circuit.

5. The low-power-consumption direct-current optical coupling isolating switch according to claim 4, characterized in that: the signal processing circuit (1) comprises a first triode (12) and a second triode (13); the first end of the first resistor (11) is connected with the first input end of the isolating switch, the second end of the first resistor (11) is connected with the first pole of the first triode (12), the second pole of the first triode (12) is connected with the second input end of the isolating switch, and the two ends of the fourth resistor (14) are respectively connected with the base electrode and the second pole of the first triode (12); the base electrode of the second triode (13) is connected with the first pole of the first triode (12), the first pole of the second triode (13) is connected with the second end of the second resistor (17), the first end of the second resistor (17) is connected with the first input end of the isolating switch, and the two ends of the fifth resistor (15) are connected in parallel with the first pole and the second pole of the second triode (13); a first end of the eighth resistor (16) is connected with a first pole of the second triode (13), and a second end of the eighth resistor (16) is used as a second output end of the signal processing circuit (1); the first end of the second resistor (17) is used as the first output end of the signal processing circuit (1).

6. The low-power-consumption direct-current optical coupling isolating switch according to claim 1, characterized in that: the optical coupling isolation circuit (2) comprises a plurality of optical coupling elements which are connected in series.

7. The low-power-consumption direct-current optical coupling isolating switch according to claim 1, characterized in that: the switching tube circuit (3) also comprises a plurality of current-limiting resistors which are in one-to-one correspondence with the plurality of switching tube elements; the current limiting resistor is connected between the control end of the switch tube and the output end of the optical coupling isolation circuit (2).

8. The low-power-consumption direct-current optical coupling isolating switch according to claim 1, characterized in that: the switch tube circuit (3) comprises a switch tube reverse connection prevention device; the switch tube reverse connection preventing device comprises a first diode (35); the anode of the first diode (35) is connected to the second pole of the switching tube element; the cathode of the first diode (35) is connected to the control terminal of the switching tube element.

9. The low-power-consumption direct-current optical coupling isolating switch according to claim 1, characterized in that: the system also comprises a user side reverse connection prevention device; the device for preventing the terminal from being reversely connected comprises a second diode (4); the anode of the second diode (4) is connected with the cathode output end of the isolating switch; and the cathode of the second diode (4) is connected with the anode output end of the isolating switch.

10. The series circuit provided with the low-power-consumption direct current optical coupling isolating switch as claimed in any one of claims 1 to 9, wherein an output port of the isolating switch is connected with a user load and a user power supply in series.