A level signal isolation conversion circuit

Abstract

A level signal isolation conversion circuit includes an input interface module, an output interface module, an input trigger level selection module, and a level conversion module. The input trigger level selection module includes at least one selection socket. Each selection socket has three lead terminals, namely, IN_L1, hH‑R‑T‑L, and IN_H1. The level conversion module includes at least one isolation optocoupler. The positive pole of the emitter of the isolation optocoupler is connected to a power supply terminal, and the power supply terminal is at a high level, the negative pole of the emitter of the isolation optocoupler is connected to the IN_L1 terminal, the C pole of the receiving end of the isolation optocoupler is electrically connected to the level terminal of the output interface module, and the E pole of the receiving end of the optocoupler is grounded. This level signal isolation conversion circuit makes the output end of the output interface module all low level, so that the level signal isolation conversion circuit has high versatility.

Description

Technical Field

[0001] The present invention relates to the technical field of isolation conversion circuits, and in particular to a level signal isolation conversion circuit. Background Art

[0002] In the semiconductor industry, the industry chain is very long, especially for related equipment, such as integrated circuit manufacturing equipment, silicon wafer production equipment, semiconductor test and measurement equipment, and other auxiliary equipment. These devices are often not produced by one company, so their input and output interface signals are usually inconsistent. Even if they are produced by the same company, their input and output interface signals may be inconsistent due to the actual requirements of the equipment operation. Therefore, when downstream manufacturers use these different devices, conversion circuits are required.

[0003] For switch discrete signals with multiple input or output channels, there are many signal types. These signals may also need to exchange data with computers, and need to solve problems such as ground isolation, level voltage conversion, and fast input or output switching. Existing circuits can only provide a certain type of signal, and a dedicated circuit needs to be designed for each signal type, which has poor versatility. Summary of the invention

[0004] In view of this, the present invention provides a level signal isolation conversion circuit that can solve the above problems.

[0005] A level signal isolation conversion circuit includes an input interface module, an output interface module, an input trigger level selection module connected between the input interface module and the output interface module, and a level conversion module connected between the output interface module and the input trigger level selection module. The input trigger level selection module includes at least one selection socket. Each selection socket has three lead terminals, namely IN_L1, hH-RTL, and IN_H1 in sequence. A jumper cap is inserted into each socket. When the jumper cap is connected between IN_L1 and hH-RTL or between hH-RTL and IN_H1, it indicates that the valid signal input by the input interface module is a low level or a high level. Each of the selection sockets also includes a transistor, the IN_H1 is electrically connected to the base of the transistor, the emitter of the transistor is grounded, and the collector is electrically connected to the IN_L1. The level conversion module includes at least one isolation optocoupler. The positive pole of the emitter of the isolation optocoupler is connected to a power supply terminal, and the power supply terminal is at a high level. The negative pole of the emitter of the isolation optocoupler is connected to the IN_L1 terminal. The C pole of the receiving end of the isolation optocoupler is electrically connected to the level terminal of the output interface module, and the E pole of the receiving end of the optocoupler is grounded. When IN_L1 and hH-RTL are connected with a jumper cap, the transistor does not participate in the circuit operation. When the signal on the hH-RTL end is at a low level, hH-RTL and IN_L1 are connected and connected to the circuit. At this time, the isolation optocoupler is turned on and the voltage of the level terminal of the output interface module is pulled down. When hH-RTL and IN_H1 are connected with a jumper cap, and when the signal on the hH-RTL end is at a high level, the base of the transistor Q1 is at a high level, the transistor is turned on, and IN_L1 is pulled down. At this time, the isolation optocoupler is turned on and the voltage of the level terminal of the output interface module is pulled down.

[0006] Furthermore, the input interface module is a combination of a bull horn socket and a Phoenix terminal or a D-Sub connector.

[0007] Furthermore, the output interface module is a combination of a bull horn socket and a Phoenix terminal or a D-Sub connector.

[0008] Furthermore, the input trigger level selection module includes 6 selection sockets, and the level conversion module includes 6 isolation optocouplers, and the 6 isolation optocouplers correspond to the 6 selection sockets.

[0009] Furthermore, the negative electrode of the transmitting end and the C electrode of the receiving end of the isolation optocoupler are connected with a pull-up resistor, and the negative electrode of the transmitting end of the isolation optocoupler is connected in series with a current-limiting resistor and a diode;

[0010] Furthermore, the level signal isolation conversion circuit also includes a power module electrically connected to the level conversion module, the power module includes a socket CN1, a diode SBD7 connected in series with the power socket CN1, a transient suppression diode TVS7 connected in parallel with the power socket CN1, an electrolytic capacitor C14 connected in parallel with the power socket CN1, and a Vwork terminal connected in series with the positive electrode of the capacitor C14, the Vwork terminal is the power terminal and is connected to the positive electrode of the emitter of the isolation optocoupler.

[0011] Furthermore, the Vwork is connected in series with a light emitting diode D2, and the other end of the light emitting diode D2 is grounded.

[0012] Furthermore, the level signal isolation conversion circuit also includes a switch unit electrically connected to the input interface module and the output interface module respectively.

[0013] Furthermore, the switch unit includes a plurality of relays and a driving chip for driving the relays to work.

[0014] Furthermore, each relay is connected in series with a set of arc extinguishing circuits.

[0015] Compared with the prior art, the level signal isolation conversion circuit provided by the present invention makes the levels of the input interface module and the output interface module correspond to each other through the input trigger level selection module, the level conversion module, and the power supply module. Specifically, when the device connected to the input interface module is at a high level, such as a 24V level, the input end of the output interface module is at a low level, and when the device connected to the input interface module is at a low level, the input end of the output interface module is also at a low level, so that the device connected to the output interface module can receive the valid signal of the device connected to the input interface module, and then communicate and control each other to achieve interconnection. Due to the presence of the input trigger level selection module and the level conversion module, the input end of the output interface module is at a low level, so that the level signal isolation conversion circuit has high versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A circuit block diagram of a level signal isolation conversion circuit provided by the present invention.

[0017] Figure 2 for Figure 1 Schematic diagram of the output interface module of the level signal isolation conversion circuit

[0018] Figure 3 for Figure 1 Schematic diagram of the input interface module of the level signal isolation conversion circuit.

[0019] Figure 4 for Figure 1 A circuit diagram of an input trigger level selection module of a level signal isolation and conversion circuit.

[0020] Figure 5 for Figure 1 A circuit diagram of a level conversion module of a level signal isolation conversion circuit.

[0021] Figure 6 for Figure 1 Schematic diagram of the circuit of the power module of the level signal isolation conversion circuit.

[0022] Figure 7 for Figure 1 Schematic diagram of the switch unit of the level signal isolation conversion circuit. DETAILED DESCRIPTION

[0023] The specific embodiments of the present invention are further described in detail below. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the protection scope of the present invention.

[0024] like Figures 1 to 7 As shown, it is a circuit schematic diagram of a level signal isolation conversion circuit provided by the present invention. The level signal isolation conversion circuit includes an output interface module 10, an input interface module 20, an input trigger level selection module 30 connected between the output interface module 10 and the input interface module 20, a level conversion module 40 connected between the output interface module 10 and the input interface module 20, a power module 50 electrically connected to the level conversion module 40, and a switch unit 60 electrically connected to the output interface module 10 and the input interface module 20 respectively. It can be imagined that the level signal isolation conversion circuit also includes some other functional modules, such as electrical connection components, various electronic components, and indication components, etc., which are well known to those skilled in the art and will not be repeated here.

[0025] The output interface module 10 can be a combination of a horn socket and a Phoenix terminal, or a D-Sub connector. In this embodiment, the output interface module 10 is a D-Sub connector. The output interface module 10 is generally used to electrically connect a device, such as a device at the control end. The control end device will output some control instructions to control the application device at the application end, and also receive some commands or requests from the application device at the application end. The output interface module 10 usually has multiple terminals, such as Figure 2 As shown, in this embodiment, it has 25 terminals for receiving or outputting different instructions or signals.

[0026] The input interface module 20 has the same composition and structure as the output interface module 10, that is, it can also be a combination of a bullhorn socket and a Phoenix terminal, or it can be a D-Sub connector. In the present embodiment, the output interface module 10 is a D-Sub connector. The input interface module 20 is usually used to electrically connect another device, such as an application-side device. The application-side device usually works according to the control-side device, and also feeds back some needs and commands to the control-side according to its needs. The output interface module 10 and the input interface module 20 and the control-side device and the application-side device to which they are electrically connected are all prior art and will not be described in detail here. In some non-standard machines, such as semiconductor equipment, the control-side device has a relatively low level, such as only 5V, due to some reasons, such as the need for control signals, and the level of the application-side device may be high or low, so monitoring conversion is required to meet the requirements of both parties.

[0027] The input trigger level selection module 30 is electrically connected to the input interface module 20. Figure 4 As shown, in this embodiment, the input trigger level selection module 30 has 6 selection sockets J1 to J6, each socket has three lead terminals, namely IN_L1, hH-RTL, and IN_H1. A jumper cap is inserted into each socket. When the jumper cap is connected to two of the three lead terminals, it indicates a high level or a low level. Taking the socket J1 as an example to illustrate its working principle, the IN_L1 is electrically connected to the corresponding end of the level conversion module 40 to input the corresponding level signal into the level conversion module 40, so that the level conversion module 40 converts according to the selected level signal. The hH-RTL is electrically connected to the corresponding end of the input interface module 20 for receiving signals from the application end device. The IN_H1 is electrically connected to the base of a transistor Q1, the emitter of the transistor Q1 is grounded, and the collector is electrically connected to the IN_L1. When IN_L1 and hH-RTL are connected with a jumper cap during operation, since there is no conduction voltage on the IN_H1 terminal, the transistor Q1 does not participate in the circuit operation. At this time, hH-RTL and IN_L1 are connected and directly connected to the circuit, which is a low level valid. When hH-RTL and IN_H1 are connected with a jumper cap, and when the signal on the hH-RTL terminal is high, the base of the transistor Q1 is high, the transistor is turned on, and IN_L1 is pulled down to participate in the circuit operation, which is a high level valid. Thus, the selection of high and low levels is achieved by selecting the jumper cap. It is well known that the jumper cap cannot be plugged into IN_L1 and IN_H1 because it is impossible to skip the hH-RTL terminal.

[0028] When the jumper cap is plugged into IN_L1 and hH-RTL, the input of the input interface module 20, that is, the input valid signal of the application-end device is at a low level. When the jumper cap is plugged into hH-RTL and IN_H1, the input of the input interface module 20, that is, the input valid signal of the application-end device is at a high level. When the input of the input interface module 20 is at a high level, the output interface module 10 should also be at a low level. And when the input of the input interface module 20 is at a low level, the output interface module 10 should also be at a low level to correspond. That is, when the input interface module 20 inputs a valid signal, the output end of the output interface module 10 should all be pulled down to a low level, indicating that the valid signal is received. If the input interface module 20 does not input a valid signal, the output end of the output interface module 10 is at a high level, indicating that no valid signal is received. It is just that the high level value of the input interface module 20 is different from the high level value of the output interface module 10. For example, the high level value of the input interface module 20 is 24V, while the high level value of the output interface module 10 is 5V.

[0029] The level conversion module 40 includes an isolation optocoupler U1 and an isolation optocoupler U2. Four optocouplers are encapsulated in the isolation optocoupler U1, and four optocouplers are encapsulated in the isolation optocoupler U2. However, in the present invention, only three optocouplers of the isolation optocoupler U1 and the isolation optocoupler U2 are used. The positive pole of the emitter of each optocoupler is electrically connected to a power terminal, the negative pole of the emitter is electrically connected to the IN_L1 terminal of the input trigger level selection module 30, the C pole of the receiving end of the optocoupler is electrically connected to the level terminal of the output interface module 10, and the E pole of the receiving end of the optocoupler is grounded. The corresponding polarity terminals of the six optocouplers are connected in series. In this embodiment, the voltage of the power terminal is 24V.

[0030] When the valid signal input by the input interface module 20 is at a high level, the jumper cap is manually plugged into hH-RTL and IN_H1, so that under the action of the transistor Q1, the emitter cathode is pulled down, and one of the power supply terminal and the IN_L1 terminal is at a high level and the other is at a low level, so that the emitter anode and the emitter cathode of each optocoupler are turned on, that is, the optocoupler is turned on, so the E pole of the receiving end of the optocoupler is grounded and turned on, so the level of the C pole of the receiving end of the optocoupler will also be pulled down to a low level. At this time, the output interface module 10 receives the valid signal input from the input interface module 20. When the valid signal input by the input-output interface module 20 is at a low level, the jumper cap is manually plugged into IN_L1 and hH-RTL. At this time, the transistor Q1 is not involved, so the emitter cathode of the optocoupler is at a low level, so that the emitter anode of each optocoupler is connected to the emitter cathode, that is, the optocoupler is turned on, so the E pole of the receiving end of the optocoupler is grounded and turned on, so the level of the C pole of the receiving end of the optocoupler will also be pulled down to a low level. At this time, the output interface module 10 also receives the valid signal input from the input interface module 20. In order to protect the stable operation of the emitter anode, the emitter cathode, and the E pole of the receiving end, the emitter cathode and the receiving C pole of the isolation optocoupler are also connected to a pull-up resistor, and the emitter cathode of the isolation optocoupler is also connected in series with a current-limiting resistor and a diode to prevent the optocoupler from being burned out by excessive voltage. Through the input trigger level selection module 30 and the level conversion module 40, the output level of the output interface module 10 remains unchanged, that is, while maintaining the 5V level, it can also receive a valid level signal from the input interface module 20, so as to notify the control end device connected to the input interface module 20 to work and output a control signal.

[0031] The power module 50 is used to provide power to the power terminal of the level conversion module 40. In this embodiment, the power provided by the power module 50 is 24V. The power module 50 includes a power socket CN1, a diode SBD7 connected in series with the power socket CN1, a transient voltage suppressor diode TVS7 connected in parallel with the power socket CN1, an electrolytic capacitor C14 connected in parallel with the power socket CN1, and a Vwork terminal connected in series with the positive electrode of the capacitor C14. The diode SBD7 is used to prevent the power socket from being reversed. The transient voltage suppressor diode TVS7 is used to suppress instantaneous overvoltage and protect the stability of the entire circuit. Its working principle is the prior art and is not repeated here. The capacitor C14 is used to ensure the stability of the output voltage, and the negative electrode of the capacitor C14 is grounded. The Vwork terminal is electrically connected to the power terminal of the level conversion module 40. The Vwork terminal is also connected in series with a light-emitting diode D2, and the other end of the light-emitting diode D2 is grounded. When the Vwork terminal has an output, the light-emitting diode D2 emits light and has an indication function.

[0032] The switch unit 60 is used to output a valid signal according to the signal of the output interface module 10 or the input interface module 20. The switch unit 60 includes a plurality of relays and a driving chip for driving the relays to work. In this embodiment, there are 6 relays, namely K1 to K6. There are two driving chips, namely U3 and U4. The driving chip U3 and the driving chip U4 are prior art, which receive signals from the output interface module 10 and the input interface module 20, that is, the control end device and the application end device to output corresponding on or off signals. The relays K1 to K6 are prior art. In order to eliminate the arc generated by the relays K1 to K6 when switching, a set of arc extinguishing circuits are connected in series to each relay K1 to K6.

[0033] Compared with the prior art, the level signal isolation conversion circuit provided by the present invention makes the levels of the output interface module 10 and the input interface module 20 correspond to each other through the input trigger level selection module 30, the level conversion module 40, and the power module 50. Specifically, when the device connected to the input interface module 20 is at a high level, such as a 24V level, the output of the output interface module 10 is at a low level, and when the device connected to the input interface module 20 is at a low level, the output of the output interface module 10 is also at a low level, so that the device connected to the output interface module 10 can receive the valid signal of the device connected to the input interface module 20, and then communicate and control each other to achieve interconnection. Due to the presence of the input trigger level selection module 30 and the level conversion module 40, the output of the output interface module 10 is all at a low level, so that the level signal isolation conversion circuit has high versatility.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent substitution or improvement within the spirit of the present invention is included in the scope of the claims of the present invention.

Claims

1. A level signal isolation conversion circuit, characterized in that: The level signal isolation conversion circuit includes an input interface module, an output interface module, an input trigger level selection module connected between the input interface module and the output interface module, and a level conversion module connected between the output interface module and the input trigger level selection module. The input trigger level selection module includes at least one selection socket, each selection socket has three lead terminals, namely, IN_L1, hH-RTL, and IN_H1 in sequence, and each socket is plugged with a jumper cap. When the jumper cap is connected between IN_L1 and hH-RTL or between hH-RTL and IN_H1, it indicates that the valid signal input by the input interface module is a low level or a high level. Each of the selection sockets also includes a transistor, the IN_H1 is electrically connected to the base of the transistor, the emitter of the transistor is grounded, the collector is electrically connected to the IN_L1, and the hH-RTL is electrically connected to the corresponding end of the input interface module. The level conversion module includes at least one isolation optocoupler, the positive electrode of the emitter of the isolation optocoupler is connected to a power supply terminal, and the power supply terminal is at a high level, the negative electrode of the emitter of the isolation optocoupler is connected to the IN_L1 terminal, the C electrode of the receiving end of the isolation optocoupler is electrically connected to the level terminal of the output interface module, and the E electrode of the receiving end of the isolation optocoupler is grounded. When IN_L1 and hH-RTL are connected with a jumper cap, the transistor does not participate in the circuit Working, when the signal on the hH-RTL end is low level, hH-RTL and IN_L1 are connected and connected to the circuit, at this time, the isolation optocoupler is turned on and the voltage of the level terminal of the output interface module is pulled down, when hH-RTL and IN_H1 are connected with a jumper cap, and when the signal on the hH-RTL end is high level, the base of the transistor Q1 is high level, the transistor is turned on, and IN_L1 is pulled down, at this time, the isolation optocoupler is turned on and the voltage of the level terminal of the output interface module is pulled down.

2. The level signal isolation conversion circuit according to claim 1, characterized in that: The input interface module is a combination of a bull horn socket and a Phoenix terminal or a D-Sub connector.

3. The level signal isolation conversion circuit according to claim 1, characterized in that: The output interface module is a combination of a bull horn socket and a Phoenix terminal or a D-Sub connector.

4. The level signal isolation conversion circuit according to claim 1, characterized in that: The input trigger level selection module includes 6 selection sockets, and the level conversion module includes 6 isolation optocouplers, and the 6 isolation optocouplers correspond to the 6 selection sockets.

5. The level signal isolation conversion circuit according to claim 1, characterized in that: The negative electrode of the transmitting end of the isolation optocoupler and the C electrode of the receiving end are connected with a pull-up resistor, and the negative electrode of the transmitting end of the isolation optocoupler is connected in series with a current-limiting resistor and a diode.

6. The level signal isolation conversion circuit according to claim 1, characterized in that: The level signal isolation conversion circuit also includes a power module electrically connected to the level conversion module, the power module includes a socket CN1, a diode SBD7 connected in series with the power socket CN1, a transient suppression diode TVS7 connected in parallel with the power socket CN1, an electrolytic capacitor C14 connected in parallel with the power socket CN1, and a Vwork terminal connected in series with the positive electrode of the capacitor C14, the Vwork terminal is the power terminal and is connected to the positive electrode of the emitter of the isolation optocoupler.

7. The level signal isolation conversion circuit according to claim 6, characterized in that: The Vwork is connected in series with a light emitting diode D2, and the other end of the light emitting diode D2 is grounded.

8. The level signal isolation conversion circuit according to claim 1, characterized in that: The level signal isolation conversion circuit also includes a switch unit electrically connected to the input interface module and the output interface module respectively.

9. The level signal isolation conversion circuit according to claim 8, characterized in that: The switch unit includes a plurality of relays and a driving chip for driving the relays to work.

10. The level signal isolation conversion circuit according to claim 9, characterized in that: Each relay is connected in series with an arc extinguishing circuit.

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