Safety grating control circuit and safety grating

Abstract

The utility model discloses a safety grating control circuit. A plurality of transmitting modules of a transmitting part are used for transmitting infrared light to a receiving part; the first main control module is used for controlling the operation of the plurality of transmitting modules; the transmitting selection module is used for starting the transmitting modules one by one according to control of the first main control module; the emission detection module is used for detecting the working current of the started emission module; a plurality of receiving modules of the receiving part are used for receiving the infrared light transmitted by the transmitting part; the second main control module is used for controlling the operation of the plurality of receiving modules and processing the received signals; the receiving selection module is used for starting the receiving modules one by one according to the control of the second main control module; the receiving detection module is used for detecting whether the intensity of the infrared light signal received by the receiving module exceeds a limit value or not and transmitting a result to the second main control module; and the safety signal module is used for transmitting safety signals with an upper computer and external equipment. According to the utility model, the problems of low sensing sensitivity and low accuracy of the existing safety grating are solved, and the safety of operators is improved.

Description

Technical Field

[0001] This utility model relates to the field of industrial safety technology, and in particular to a safety light curtain control circuit. Background Technology

[0002] A safety light curtain is a photoelectric protection device used for industrial safety. It consists of a transmitter and a receiver, creating a detectable zone using an infrared beam. It is typically used to prevent people or objects from entering hazardous areas. The safety light curtain works by using an infrared beam between the transmitter and receiver. When a person or object enters and obstructs the beam, the safety light curtain outputs a danger signal to an external host computer. The host computer then receives the danger signal and controls the equipment to stop, thus improving operator safety.

[0003] Chinese patent CN202010722725.7 discloses a safety light curtain control device, including a transmitting module and a receiving module. It determines whether the light beam is blocked by generating a pulse signal in the transmitting module and detecting the pulse signal in the receiving module. The drawback of this solution is its low sensing sensitivity; it only issues an alarm signal and displays an abnormal state when the light beam is completely blocked and the pulse signal is missing. Furthermore, it cannot determine whether the transmitter light source itself is faulty.

[0004] In view of this, it is necessary to propose a new safety light curtain control circuit to improve the above-mentioned problems. Utility Model Content

[0005] The purpose of this invention is to provide a safety light curtain control circuit and a safety light curtain, which solves the problems of low sensing sensitivity and low accuracy of existing safety light curtains, thereby improving the safety of operators.

[0006] This utility model provides the following solution:

[0007] According to the first aspect, this utility model proposes a safety light curtain control circuit, including a transmitter and a receiver;

[0008] The launching unit includes:

[0009] Multiple transmitting modules are used to send infrared light to the receiving unit;

[0010] The first main control module is used to control the operation of the multiple transmitting modules;

[0011] A transmission selection module, connected to the plurality of transmission modules and a first main control module, is used to enable the transmission modules one by one according to the control of the first main control module;

[0012] The transmission detection module connects the plurality of transmission modules and the first main control module, and is used to detect the operating current of the activated transmission modules;

[0013] The first communication module is connected to the first main control module and is used to communicate with the receiving unit;

[0014] The receiving unit includes:

[0015] Multiple receiving modules are used to receive infrared light transmitted by the transmitting unit;

[0016] The second main control module is used to control the operation of the multiple receiving modules and process the received signals;

[0017] A receiver selection module is connected to the plurality of receiver modules and the second main control module, and is used to enable the receiver modules one by one according to the control of the second main control module;

[0018] A receiving detection module, connected to the plurality of receiving modules and the second main control module, is used to detect whether the intensity of the infrared light signal received by the receiving module exceeds the limit, and transmit the result to the second main control module;

[0019] The second communication module is connected to the second main control module and is used to communicate with the transmitting unit;

[0020] The safety signal module is connected to the second main control module and is used to transmit safety signals with the host computer and external devices.

[0021] Optionally, the transmitting module includes a transmitting switch and an infrared lamp, wherein the transmitting switch turns the infrared lamp on or off according to the transmitting pulse signal generated by the first main control module; the receiving module includes a photoelectric converter, wherein the photoelectric converter converts the received infrared light into an electrical signal and transmits it to the second main control module.

[0022] Optionally, the transmission selection module includes a transmission triggering unit, a first transmission signal separation unit, and a second transmission signal separation unit;

[0023] The transmit trigger unit includes a first D flip-flop and a second D flip-flop. The clock terminals of the first and second D flip-flops receive the transmit selection clock signal from the first master control module. The D input terminal of the first D flip-flop receives the transmit selection signal from the first master control module. The Q output terminal of the first D flip-flop outputs the chip select signal of the first transmit signal separation unit. The Q output terminal of the second D flip-flop outputs the chip select signal of the second transmit signal separation unit. The Q output terminals of the first and second D flip-flops also output transmit trigger feedback signals to the first master control module.

[0024] The first transmission signal separation unit is connected to the transmission trigger unit, the first main control module and a portion of the multiple transmission modules. The first transmission signal separation unit is enabled according to the chip select signal generated by the transmission trigger unit, and transmits the transmission pulse signal generated by the first main control module to the selected transmission module according to the transmission address signal of the first main control module.

[0025] The second transmission signal separation unit is connected to the transmission trigger unit, the first main control module and another part of multiple transmission modules. The second transmission signal separation unit selects to enable according to the chip select signal generated by the transmission trigger unit, and transmits the transmission pulse signal generated by the first main control module to the selected transmission module according to the transmission address signal of the first main control module.

[0026] Optionally, the emission detection module includes an emission module current-to-voltage unit, an emission detection reference voltage unit, and an emission detection comparison unit;

[0027] The current-to-voltage conversion unit of the transmitting module is connected to each of the transmitting modules and is used to convert the current flowing through the transmitting module into the detection voltage of the transmitting module.

[0028] The emission detection reference voltage unit is used to provide the emission detection reference voltage;

[0029] The transmission detection comparison unit is connected to the transmission module current-to-voltage unit and the transmission detection reference voltage unit. It is used to compare the transmission module detection voltage with the transmission detection reference voltage and output the transmission detection signal to the first main control module according to the comparison result.

[0030] Optionally, the receiving selection module includes a receiving trigger unit, a first receiving signal multiplexing unit, and a second receiving signal multiplexing unit;

[0031] The receiving trigger unit includes a third D flip-flop and a fourth D flip-flop. The clock terminals of the third and fourth D flip-flops receive the receiving selection clock signal from the second main control module. The D input terminal of the third D flip-flop receives the receiving selection signal from the second main control module. The Q output terminal of the third D flip-flop outputs the chip select signal of the first receiving signal multiplexing unit. The Q output terminal of the fourth D flip-flop outputs the chip select signal of the second receiving signal multiplexing unit. The Q output terminals of the third and fourth D flip-flops also output a receiving trigger feedback signal to the second main control module.

[0032] The first receiving signal multiplexing unit is connected to the receiving trigger unit, the second main control module and a portion of the multiple receiving modules. The first receiving signal multiplexing unit selects to enable the receiving module according to the chip select signal generated by the receiving trigger unit, and transmits the electrical signal generated by the selected receiving module to the second main control module according to the receiving address signal of the second main control module.

[0033] The second receiving signal multiplexing unit connects the receiving trigger unit, the second main control module, and another part of multiple receiving modules. The second receiving signal multiplexing unit selects and enables the receiving module according to the chip select signal generated by the receiving trigger unit, and transmits the electrical signal generated by the selected receiving module to the second main control module according to the receiving address signal of the second main control module.

[0034] Optionally, the receiving and detection module includes a receiving and detection amplification unit, a receiving and detection reference voltage unit, and a receiving and detection comparison unit;

[0035] The receiving detection amplification unit is connected to each of the receiving modules and is used to amplify the electrical signal generated by the receiving module to obtain the receiving module detection voltage.

[0036] The receiving and detection reference voltage unit is used to provide the receiving and detection reference voltage;

[0037] The receiving detection comparison unit is connected to the receiving detection amplification unit and the receiving detection reference voltage unit. It is used to compare the receiving module detection voltage with the receiving detection reference voltage and output the receiving detection signal to the second main control module according to the comparison result.

[0038] Optionally, both the first communication module and the second communication module are CAN communication modules.

[0039] Optionally, the safety signal module includes an OSSD signal output unit, an EDM signal input unit, and an auxiliary signal output unit; the OSSD signal output unit is used to output OSSD safety signals to the host computer, the EDM signal input unit is used to receive EDM safety signals input from external devices, and the auxiliary signal output unit is used to output auxiliary signals to external devices.

[0040] Optionally, the transmitting unit further includes a first indicator light module connected to the first main control module, and the receiving unit further includes a second indicator light module connected to the second main control module. Both the first indicator light module and the second indicator light module are used to display whether the infrared light transmitted by the transmitting module is received or blocked.

[0041] According to a second aspect, the present invention also provides a safety light curtain, the safety light curtain including a safety light curtain control circuit as described in the first aspect above.

[0042] This utility model has the following advantages compared with the prior art:

[0043] This invention enables the transmitting module and its corresponding receiving module to be activated one by one, avoiding the interference of adjacent transmitting LEDs on the receiving end when multiple transmitting modules are transmitting simultaneously, thus improving the sensing sensitivity of the safety light curtain. The transmitting detection module monitors the operation of the infrared lights at the transmitting end, promptly detecting faults and preventing misjudgments of light blocking, thereby improving the sensing accuracy of the safety light curtain. The safety signal module transmits safety signals to the host computer or external devices, promptly responding to situations where infrared light is blocked or equipment malfunctions, thereby controlling equipment shutdown and informing workers of the status, improving worker safety. Attached Figure Description

[0044] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0045] Figure 1 These are schematic block diagrams of some embodiments of this utility model;

[0046] Figure 2 This is the circuit schematic diagram of the first power supply module of this utility model;

[0047] Figure 3 This is the circuit schematic diagram of the first voltage detection module of this utility model;

[0048] Figure 4 This is the circuit schematic diagram of the transmitting module of this utility model;

[0049] Figure 5 This is the circuit schematic diagram of the transmit selection module of this utility model;

[0050] Figure 6 This is the circuit schematic diagram of the emission detection module of this utility model;

[0051] Figure 7 This is the circuit schematic diagram of the receiving module of this utility model;

[0052] Figure 8 This is the circuit schematic diagram of the receiver selection module of this utility model;

[0053] Figure 9 This is the circuit schematic diagram of the receiving and detection module of this utility model;

[0054] Figure 10 This is the circuit schematic diagram of the first communication module of this utility model;

[0055] Figure 11 This is the circuit schematic diagram of the OSSD signal output unit of this utility model;

[0056] Figure 12 This is the circuit schematic diagram of the EDM signal input unit of this utility model;

[0057] Figure 13 This is the circuit schematic diagram of the auxiliary signal output unit of this utility model;

[0058] Figure 14 This is the circuit schematic diagram of the first indicator light module of this utility model.

[0059] In the picture:

[0060] 100 - Transmitter; 110 - Transmitter module; 120 - First main control module; 130 - Transmit selection module; 150 - First communication module; 160 - First power supply module; 170 - First indicator light module; 180 - First voltage detection module; 200 - Receiver; 210 - Receiver module; 220 - Second main control module; Receiver selection module 230; Receiver detection module 240; Second communication module 250; 260 - Safety signal module; 270 - Second power supply module; 280 - Second indicator light module; 290 - Second voltage detection module. Detailed Implementation

[0061] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0062] See Figure 1 This utility model proposes an embodiment of a safety light curtain control circuit, including a transmitter 100 and a receiver 200.

[0063] The transmitting unit 100 includes multiple transmitting modules 110, a first main control module 120, a transmission selection module 130, and a first communication module 150. The multiple transmitting modules 110 are used to transmit infrared light to the receiving unit 200. The first main control module 120 is used to control the operation of the multiple transmitting modules 110. The transmission selection module 130 connects the multiple transmitting modules 110 and the first main control module 120, and is used to activate the transmitting modules 110 one by one according to the control of the first main control module 120. The transmission detection module 140 connects the multiple transmitting modules 110 and the first main control module 120, and is used to detect the operating current of the activated transmitting modules 110. The first communication module 150 connects to the first main control module 120 and is used to communicate with the receiving unit 200.

[0064] The receiving unit 200 includes multiple receiving modules 210, a second main control module 220, a receiving selection module 230, a receiving detection module 240, a second communication module 250, and a safety signal module 260. The multiple receiving modules 210 and multiple transmitting modules 110 are used to receive infrared light transmitted by the transmitting unit 100. The second main control module 220 is used to control the operation of the multiple receiving modules 210 and process the received signals. The receiving selection module 230 is connected to the multiple receiving modules 210 and the second main control module 220, and is used to enable the receiving modules 210 one by one according to the control of the second main control module 220. The receiving detection module 240 is connected to the multiple receiving modules 210 and the second main control module 220, and is used to detect whether the intensity of the infrared light signal received by the receiving module 210 exceeds a limit, and transmit the result to the second main control module 220. The second communication module 250 is connected to the second main control module 220 and is used to communicate with the transmitting unit 100. The safety signal module 260 is connected to the second main control module 220 and is used to transmit safety signals with the host computer and external devices.

[0065] The working principle of this utility model embodiment is as follows: the first main control module 120 controls multiple transmitting modules 110 to be activated one by one through the transmitting selection module 130, sending infrared light to the receiving unit 200; the second main control module 220 controls multiple receiving modules 210 to be activated one by one through the receiving selection module 230 to receive infrared light; the first main control module 120 can obtain the working status of multiple transmitting modules 110 through the transmitting detection module 140 to determine whether a fault has occurred; the second main control module 220 can obtain whether the infrared light is blocked through the receiving detection module 240; the first main control module 120 and the second main control module 220 can communicate through the first communication module 150 and the second communication module 250 to synchronously transmit control and detection result signals; when the infrared light is blocked or the equipment malfunctions, a safety signal is transmitted to the host computer or external device through the safety signal module 260.

[0066] This invention enables the transmitting module 110 and the corresponding receiving module 210 one by one, which avoids the influence of adjacent transmitting LEDs on the receiving end when multiple transmitting modules 110 transmit simultaneously, making it impossible to accurately determine whether it is in a light-blocking state, thus improving the sensing sensitivity of the safety light curtain. The receiving detection module 240 can monitor the situation of infrared light being blocked. The transmitting detection module 140 can monitor the working status of the infrared lamps at the transmitting end, detect faults in time, avoid misjudgment as light blocking, and improve the sensing accuracy of the safety light curtain. The safety signal module 260 transmits safety signals to the host computer or external devices, promptly responding to situations where infrared light is blocked or equipment malfunctions, thereby controlling the equipment to stop and informing the staff of the status, improving the safety of the operators.

[0067] In some embodiments, see Figure 1 The transmitter 100 also includes a first power module 160, and the receiver 200 also includes a second power module 270; both the first power module 160 and the second power module 270 are used to provide 24V power, 5V power and 3.3V power.

[0068] Figure 2 A specific embodiment of the first power supply module 160 is provided, and the second power supply module 270 is similar. The first power supply module 160 includes a 24V power supply unit 161, a 5V power supply unit 162, and a 3.3V power supply unit 163. In the 24V power supply unit 161, the external power supply VCC is supplied as 24V through a resistor F1, a Schottky diode D1, and a transformer T1. Varistors R1, R2, and R3 between the external power supply VCC and the power ground, as well as a TVS diode D2, are used for overvoltage protection. In the 5V power supply unit 162, the 24V power supply is converted to a 5V power output through a buck converter U1 and peripheral circuitry. In the 3.3V power supply unit 162, the 5V power supply is converted to a 3.3V power output through a low-dropout linear regulator U2 and peripheral circuitry.

[0069] As an example, the buck converter U1 can use the TPS543x series chip, and the low dropout linear regulator U2 can use the RT9193 series chip.

[0070] In some embodiments, see Figure 1 The transmitting unit 100 also includes a first voltage detection module 180 connected to the first main control module 120 and the first power supply module 160, and the receiving unit 200 also includes a second voltage detection module 290 connected between the second main control module 220 and the second power supply module 270; the first voltage detection module 180 and the second voltage detection module 290 are both used to detect the voltage of the 24V power supply, the 5V power supply and the 3.3V power supply.

[0071] Figure 3 A specific implementation of the first voltage detection module 180 is provided, and the second voltage detection module 290 is similar. In the first voltage detection module 180, the 24V power supply is divided by resistors R29 and R30 and then connected to the 24V power supply detection terminal ADC3 of the first main control module 120 via resistor R31; the 5V power supply is divided by resistors R32 and R33 and then connected to the 5V power supply detection terminal ADC2 of the first main control module 120 via resistor R34; the 3.3V power supply is divided by resistors R35 and R36 and then connected to the 3.3V power supply detection terminal ADC1 of the first main control module 120 via resistor R37.

[0072] In some embodiments, see Figure 4 The transmitting module 110 includes a transmitting switch and an infrared lamp. The transmitting switch turns the infrared lamp on or off according to the transmitting pulse signal generated by the first main control module 120.

[0073] In one specific embodiment, each of the multiple transmitting modules 110 includes a resistor R11, a PMOS transistor Q1, a capacitor C18, and an infrared lamp LED1. The gate of the PMOS transistor Q1 serves as the transmitting control terminal S1, the source is connected to the anode of the infrared lamp LED1, and the drain is connected to a 5V power supply. The resistor R11 is connected in parallel between the gate and drain of the PMOS transistor Q1, and the capacitor C18 is connected in parallel between the drain of the PMOS transistor Q1 and ground. The cathode of the infrared lamp LED1 serves as the transmitting detection terminal DL. When the transmitting control terminal S1 is low, the PMOS transistor Q1 is saturated and turned on, the infrared lamp LED1 is powered on, and it emits infrared light. When the transmitting control terminal S1 is high, the PMOS transistor Q1 is turned off, and the infrared lamp LED1 is de-energized and turned off.

[0074] In some embodiments, see Figure 5The transmit selection module 130 includes a transmit trigger unit 131, a first transmit signal separation unit 132, and a second transmit signal separation unit 133. The transmit trigger unit 131 includes a first D flip-flop and a second D flip-flop. The clock terminals of the first and second D flip-flops receive the transmit selection clock signal from the first master control module 120. The D input terminal of the first D flip-flop receives the transmit selection signal from the first master control module 120. The Q output terminal of the first D flip-flop outputs the chip select signal from the first transmit signal separation unit 132. The Q output terminal of the second D flip-flop outputs the chip select signal from the second transmit signal separation unit 133. The Q output terminals of both the first and second D flip-flops also output transmit trigger feedback signals to the first master control module 120. The first transmit signal separation unit 132 is connected to the transmit trigger unit 131, the first main control module 120, and a portion of the multiple transmit modules 110. The first transmit signal separation unit 132 is enabled based on the chip select signal generated by the transmit trigger unit 131, and transmits the transmit pulse signal generated by the first main control module 120 to the selected transmit module 110 according to the transmit address signal of the first main control module 120. The second transmit signal separation unit 133 is connected to the transmit trigger unit 131, the first main control module 120, and another portion of the multiple transmit modules 110. The second transmit signal separation unit 133 is enabled based on the chip select signal generated by the transmit trigger unit 131, and transmits the transmit pulse signal generated by the first main control module 120 to the selected transmit module 110 according to the transmit address signal of the first main control module 120.

[0075] In this embodiment, when the transmit selection signal is low, after the rising edge of the first transmit selection clock signal, the Q output of the first D flip-flop is low, and the first transmit signal separation unit 132 is enabled. After the rising edge of the second transmit selection clock signal, the Q output of the second D flip-flop is low, and the second transmit signal separation unit 133 is enabled. When the transmit selection signal is high, after the rising edge of the first transmit selection clock signal, the Q output of the first D flip-flop is high, and the first transmit signal separation unit 132 is disabled. After the rising edge of the second transmit selection clock signal, the Q output of the second D flip-flop is high, and the second transmit signal separation unit 133 is disabled. When either the first transmit signal separation unit 132 or the second transmit signal separation unit 133 is enabled, the transmit pulse signal generated by the first main control module 120 can be transmitted to the selected transmit module 110 according to the transmit address signal of the first main control module 120, thereby realizing the control of multiple transmit modules 110 to be enabled one by one.

[0076] In one specific embodiment, the transmit trigger unit 131 includes a dual-channel D flip-flop U3, resistors R6, R7, and R8, capacitors C16 and C17, a Schottky diode D3, and a Schottky diode D4. The dual-channel D flip-flop U3 comprises two independent D flip-flops. The first D input pin of the dual-channel D flip-flop U3 is connected to the transmit selection signal terminal D1 of the first main control module 120 via resistor R7. The first clock input pin and the second clock input pin of the dual-channel D flip-flop U3 are both connected to the transmit selection clock terminal CLK of the first main control module 120. The first Q output pin of the dual-channel D flip-flop U3 is connected via resistor R6. The cathode of Schottky diode D3, one end of capacitor C16, the second D input pin of dual-channel D flip-flop U3, and the chip select terminal A1 of the first transmit signal separation unit 132 are connected. The anode of Schottky diode D3 is connected to the transmit trigger feedback terminal DFK of the first main control module 120, and the other end of capacitor C16 is grounded. The second Q output pin of dual-channel D flip-flop U3 is connected to the cathode of Schottky diode D4, one end of capacitor C17, and the chip select terminal A2 of the second transmit signal separation unit 133 via resistor R6. The anode of Schottky diode D4 is connected to the transmit trigger feedback terminal DFK of the first main control module 120, and the other end of capacitor C17 is grounded.

[0077] The first transmit signal separation unit 132 includes a signal separator U4, resistors R9, R84, R85, R86, R87, and R88. The transmit address terminals A, B, and C of the first main control unit 120 are connected to the address signal pins of the signal separator U4 via resistors R84, R85, and R86, respectively. The output signal pins of the signal separator U4 are connected to the transmit control terminals (S1, S2, ..., S8) of a portion of the multiple transmit modules 110. The first gate pin of the signal separator U4 is connected to a 5V power supply. The second gate pin A of the signal separator U4 is connected to one end of resistor R87, and the other end of resistor R87 serves as the chip select terminal A1 of the first transmit signal separation unit 132. The second gate pin B of the signal separator U4 is connected to the transmit pulse signal terminal EN of the first main control module 120 via resistor R88. The second gate pin B of the signal separator U4 is also connected to a 5V power supply via resistor R9.

[0078] The second transmit signal separation unit 133 includes a signal separator U5, resistors R10, R89, R90, R91, R92, and R93. The transmit address terminals A, B, and C of the first main control unit 120 are connected to the three-wire signal pins of the signal separator U5 via resistors R89, R90, and R91, respectively. The eight-wire signal pins of the signal separator U5 are connected to the transmit control terminals (S9, S10, ..., S16) of multiple transmit modules 110 in another part. The first gate pin of the signal separator U5 is connected to a 5V power supply. The second A gate pin of the signal separator U5 is connected to one end of resistor R92. The other end of resistor R92 serves as the chip select terminal A2 of the second transmit signal separation unit 133. The second B gate pin of the signal separator U5 is connected to the transmit pulse signal EN of the first main control module 120 via resistor R93. The second B gate pin of the signal separator U5 is also connected to a 5V power supply via resistor R10.

[0079] Signal splitter U4 and signal splitter U5 are both 3-to-8 decoders, which can output the transmit pulse signal of the first main control unit 120 to a connected transmit module 110 according to the selection of the transmit address signal. With the chip select signal generated by the transmit trigger unit 131, multiple transmit modules 110 can be controlled to be activated one by one.

[0080] As an example, the dual-channel D flip-flop U3 can use the CD4013 series chip, and both the signal splitter U4 and the signal splitter U5 can use the 74HC138 series chip.

[0081] In other embodiments, the transmit trigger unit 131 may also employ a greater number of D flip-flops, correspondingly connecting a greater number of transmit signal separation units, so as to enable a greater number of transmit modules 110 one by one.

[0082] In some embodiments, see Figure 6 The transmission detection module 140 includes a transmission module current-to-voltage unit 141, a transmission detection reference voltage unit 142, and a transmission detection comparison unit 143. The transmission module current-to-voltage unit 141 is connected to each transmission module 110 and is used to convert the current flowing through the transmission module 110 into a transmission module detection voltage. The transmission detection reference voltage unit 142 is used to provide a transmission detection reference voltage. The transmission detection comparison unit 143 is connected to the transmission module current-to-voltage unit 141 and the transmission detection reference voltage unit 142, and is used to compare the transmission module detection voltage with the transmission detection reference voltage, and output a transmission detection signal to the first main control module 120 based on the comparison result.

[0083] In one specific embodiment, the current-to-voltage conversion unit 141 of the transmitting module includes a resistor R12 and a Schottky diode D5. One end of the resistor R12 is connected to the transmitting detection terminal DL of the multiple transmitting modules 110 and the anode of the Schottky diode D5. The other end of the resistor R12 is connected to the ground terminal. The cathode of the Schottky diode D5 serves as the transmitting module detection voltage terminal TX_FK.

[0084] The emission detection reference voltage unit 142 includes a voltage regulator U6, resistors R13, R14, R15, R16, and R17. The anode pin of the voltage regulator U6 is grounded. Resistor R13 is connected in parallel between the cathode pin and the reference pin of the voltage regulator U6. Resistor R14 is connected in parallel between the anode pin and the reference pin of the voltage regulator U6. The cathode pin of the voltage regulator U6 is connected to a 5V power supply through resistor R15. A 2.5V reference power supply is formed at the reference pin of the voltage regulator U6. The emission detection reference voltage is obtained after the 2.5V reference power supply is divided by resistors R16 and R17.

[0085] As an example, the voltage regulator U6 can use the LM431 series chip.

[0086] The transmit detection comparison unit 143 includes a comparator U4, resistors R18 and R19, and capacitor C19. The transmit detection reference voltage is connected to the negative input terminal of comparator U4, and the transmit module's detected voltage terminal TX_FK is connected to the positive input terminal of comparator U4. Resistor R19 is connected in parallel between the positive input terminal of comparator U4 and ground. Comparator U4 is powered by a 3.3V power supply. The output terminal of comparator U4 is connected to the transmit detection receiver terminal TX_FK-3.3 of the first main control module 120 via resistor R19. This allows the transmitter module to send a high-level signal to the transmit detection receiver terminal TX_FK-3.3 of the first main control module 120 when the voltage detected by the transmitter module is higher than the transmit detection reference voltage.

[0087] In some embodiments, see Figure 7 The receiving module 210 includes a photoelectric converter, which converts the received infrared light into an electrical signal and transmits it to the second main control module 220.

[0088] In one specific embodiment, each of the multiple receiving modules 210 includes a photoelectric converter U14, a resistor R60, and a resistor R61. The collector of the photoelectric converter U14 serves as the current output terminal LL of the receiving module 210. The emitter of the photoelectric converter U14 is connected to one end of the resistor R60 and one end of the resistor R61. The other end of the resistor R60 is grounded, and the other end of the resistor R61 serves as the signal output terminal O1 of the receiving module 210. The signal output terminal O1 is connected to the second main control module 220.

[0089] In other embodiments, the multiple receiving modules 210 also include a resistor R62, and the emitter of the photoelectric converter U14 is also connected to a backup second main control module via the resistor R62, which can prevent single-point failure in a signal link and improve the reliability of the device.

[0090] In some embodiments, see Figure 8 The receive selection module 230 includes a receive trigger unit 231, a first receive signal multiplexing unit 232, and a second receive signal multiplexing unit 233. The receive trigger unit 231 includes a third D flip-flop and a fourth D flip-flop. The clock terminals of the third and fourth D flip-flops receive the receive selection clock signal from the second main control module 220. The D input terminal of the third D flip-flop receives the receive selection signal from the second main control module 220. The Q output terminal of the third D flip-flop outputs the chip select signal of the first receive signal multiplexing unit 232. The Q output terminal of the fourth D flip-flop outputs the chip select signal of the second receive signal multiplexing unit 233. The Q output terminals of the third and fourth D flip-flops also output receive trigger feedback signals to the second main control module 220. The first receiving signal multiplexing unit 232 is connected to the receiving trigger unit 231, the second main control module 220, and a portion of the multiple receiving modules 210. The first receiving signal multiplexing unit 232 selects the enabled receiver based on the chip select signal generated by the receiving trigger unit 231, and transmits the electrical signal generated by the selected receiving module 210 to the second main control module 220 according to the receiving address signal of the second main control module 220. The second receiving signal multiplexing unit 233 is connected to the receiving trigger unit 231, the second main control module 220, and another portion of the multiple receiving modules 210. The second receiving signal multiplexing unit 233 selects the enabled receiver based on the chip select signal generated by the receiving trigger unit 231, and transmits the electrical signal generated by the selected receiving module 210 to the second main control module 220 according to the receiving address signal of the second main control module 220.

[0091] In this embodiment, when the receive selection signal is low, after the rising edge of the first receive selection clock signal, the Q output of the third D flip-flop is low, and the first receive signal multiplexing unit 232 is enabled. After the rising edge of the second receive selection clock signal, the Q output of the fourth D flip-flop is low, and the second receive signal multiplexing unit 233 is enabled. When the receive selection signal is high, after the rising edge of the first receive selection clock signal, the Q output of the third D flip-flop is high, and the first receive signal multiplexing unit 232 is disabled. After the rising edge of the second receive selection clock signal, the Q output of the fourth D flip-flop is high, and the second receive signal multiplexing unit 233 is disabled. When either the first receive signal multiplexing unit 232 or the second receive signal multiplexing unit 233 is enabled, the electrical signal generated by the selected receive module 210 can be transmitted to the second main control module 220 according to the receive address signal of the second main control module 220, thereby realizing the control of multiple receive modules 210 to be enabled one by one.

[0092] In one specific embodiment, the receiving trigger unit 231 includes a dual-channel D flip-flop U11, resistors R49, R50, R51, and R52, capacitors C31 and C32, a Schottky diode D8, and a Schottky diode D9. The dual-channel D flip-flop U11 comprises two independent D flip-flops. The first D input pin of the dual-channel D flip-flop U11 is connected to the receive selection signal terminal D1 of the second main control module 220 via resistor R50. The first clock input pin and the second clock input pin of the dual-channel D flip-flop U11 are both connected to the receive selection clock terminal MCU1_CLK of the first main control module 120. The first Q output pin of the dual-channel D flip-flop U11 is connected to the Schottky diode D8 via resistor R49. The cathode of Schottky diode D8, one end of capacitor C31, one end of resistor R52, and the chip select terminal MCU1_A1 of the first receiving signal multiplexing unit 232 are connected. The other end of resistor R52 is connected to the second D input pin of the dual-channel D flip-flop U11. The anode of Schottky diode D8 is connected to the receiving trigger feedback terminal DFK1 of the second main control module 220. The other end of capacitor C31 is grounded. The second Q output pin of the dual-channel D flip-flop U11 is connected to the cathode of Schottky diode D9, one end of capacitor C32, and the chip select terminal MCU1_A2 of the second receiving signal multiplexing unit 233 via resistor R51. The anode of Schottky diode D9 is connected to the receiving trigger feedback terminal DFK1 of the second main control module 220. The other end of capacitor C32 is grounded.

[0093] The first receiving signal multiplexing unit 232 includes a multiplexer U12, resistors R53, R54, and R55. The receiving address terminals MCU1_A, MCU1_B, and MCU1_C of the second main control unit 220 are connected to the address signal pins of the multiplexer U12 via resistors R53, R54, and R55, respectively. The signal input pins of the multiplexer U12 are connected to the signal output terminals O1 of a portion of the multiple receiving modules 210. The signal output pins of the multiplexer U12 serve as the output terminal GXH1 of the receiving selection module 230 and are connected to the receiving detection module 240. The enable pin of the multiplexer U12 serves as the chip select terminal MCU1_A1 of the first receiving signal multiplexing unit 232.

[0094] The second receiving signal multiplexing unit 233 includes a multiplexer U13, resistors R56, R57, and R58. The receiving address terminals MCU1_A, MCU1_B, and MCU1_C of the second main control unit 220 are connected to the address signal pins of the multiplexer U13 via resistors R56, R57, and R58, respectively. The signal input pins of the multiplexer U13 are connected to the signal output terminals O1 of the multiple receiving modules 210 in another part. The signal output pins of the multiplexer U13 serve as the output terminal GXH1 of the receiving selection module 230 and are connected to the receiving detection module 240. The enable pin of the multiplexer U13 serves as the chip select terminal MCU1_A2 of the second receiving signal multiplexing unit 233.

[0095] Both multiplexers U12 and U13 are 8:1 analog signal multiplexers. They can select one of the electrical signals generated by the receiving module 210 to be transmitted to the second main control module 220 according to the receiving address signal. With the chip select signal generated by the receiving trigger unit 231, multiple receiving modules 210 can be controlled to be activated one by one.

[0096] As an example, the dual-channel D flip-flop U11 can use the CD4013 series chip, and the multiplexers U12 and U13 can both use the 74HC4051 series chip.

[0097] In other embodiments, the receiving trigger unit 231 may also employ a greater number of D flip-flops, correspondingly connecting a greater number of receiving signal multiplexing units, so as to enable a greater number of receiver modules 210 one by one.

[0098] In some embodiments, see Figure 9The receiving detection module 240 includes a receiving detection amplification unit 241, a receiving detection reference voltage unit 242, and a receiving detection comparison unit 243. The receiving detection amplification unit 241 is connected to each receiving module 210 and amplifies the electrical signal generated by the receiving module 210 to obtain the receiving module detection voltage. The receiving detection reference voltage unit 242 provides the receiving detection reference voltage. The receiving detection comparison unit 243 is connected to the receiving detection amplification unit 241 and the receiving detection reference voltage unit 242, and compares the receiving module detection voltage with the receiving detection reference voltage, outputting a receiving detection signal to the second main control module 220 based on the comparison result.

[0099] In one specific embodiment, the receiving detection amplification unit 241 includes an operational amplifier U8, resistors R38, R39, R40, R41, and R43, capacitors C25 and C28, and a Schottky diode D7. The positive input terminal of the operational amplifier U8 is connected to one end of capacitor C25. The other end of capacitor C25 is connected to one end of resistor R38, one end of resistor R39, and the output terminal GXH1 of the receiving selection module 230. The other end of resistor R38 is connected to the receiving signal feedback terminal IR-FK1 of the second main control module 220. The other end of resistor R39 is grounded. The negative input terminal of the operational amplifier U8 is grounded through resistor R40 and connected to the output terminal of the operational amplifier U8 through resistor R41. The output terminal of the operational amplifier U8 is connected to the anode of the Schottky diode D7. The cathode of the Schottky diode D7 is grounded through the parallel resistor R43 and capacitor R28. The cathode of the Schottky diode D7 serves as the output terminal IN1 of the receiving detection amplification unit 241, outputting the detection voltage of the receiving module.

[0100] The receiving and detection reference voltage unit 242 includes a voltage regulator U9, resistors R43, R44, R45, R46, and R47. The anode pin of the voltage regulator U9 is grounded. Resistor R43 is connected in parallel between the cathode pin and the reference pin of the voltage regulator U9. Resistor R44 is connected in parallel between the anode pin and the reference pin of the voltage regulator U9. The cathode pin of the voltage regulator U9 is connected to a 5V power supply via resistor R45. A 2.5V reference power supply is formed at the reference pin of the voltage regulator U9. The 2.5V reference power supply is divided by resistors R46 and R47 to obtain the receiving and detection reference voltage.

[0101] As an example, the voltage regulator U9 can use the LM431 series chip.

[0102] The receiving detection comparison unit 243 includes a comparator U10, a resistor R48, and a capacitor C30. The receiving detection reference voltage is connected to the negative input terminal of the comparator U4, and the output terminal IN1 of the receiving detection amplification unit 241 is connected to the positive input terminal of the comparator U10. The comparator U4 is powered by a 3.3V power supply, and the capacitor C30 is connected in parallel between the power supply and ground. The output terminal of the comparator U10 is connected to the receiving detection receiver terminal INFO-1 of the second main control module 220 via the resistor R48. This enables the receiving module to send a high-level signal to the receiving detection receiver terminal INFO-1 of the second main control module 220 when the voltage detected by the receiving module is higher than the receiving detection reference voltage.

[0103] In some embodiments, both the first communication module 150 and the second communication module 250 are CAN communication modules. Through the CAN bus and the CAN communication module, the first main control module 120 and the second main control module 220 can communicate and synchronously transmit control and detection result signals. It is understood that the communication between the transmitter 100 and the receiver 200 in this embodiment can be divided into optical synchronization and line synchronization. When the infrared light transmitted by the transmitter 100 is not received by the receiver 200, the transmitter 100 will send a synchronization signal to the receiver 200, informing the receiver 200 that infrared light has been transmitted. If the receiver 200 does not receive the infrared light, it will send a corresponding signal back to the transmitter. At this time, both the transmitter 100 and the receiver 200 will simultaneously display a light-blocking state. The CAN communication module is suitable for line synchronization and can also be used to determine whether it is optical synchronization or line synchronization.

[0104] Figure 10 A specific implementation of the first communication module 150 is provided, and the second communication module 250 is similar. The first communication module 150 includes a CAN communication chip U7. The transmitting signal terminal TXD1 and the receiving signal terminal RXD1 of the first main control module 120 are connected to the CAN communication chip U7. The CANH pin and CANL pin of the CAN communication chip U7 are connected to the high-level line CANH and the low-level line CANL of the CAN bus via transformer T2. The high-level line CANH and the low-level line CANL of the CAN bus are grounded via resistors R20 and R21 and capacitor C21. The high-level line CANH and the low-level line CANL of the CAN bus are also grounded via the CAN bus electrostatic discharge protection diode D6.

[0105] As an example, the CAN communication chip U7 can use the TJA1050 series chip.

[0106] In some embodiments, see Figures 11 to 14The safety signal module 260 includes an OSSD signal output unit 261, an EDM signal input unit 262, and an auxiliary signal output unit 263. The OSSD signal output unit 261 is used to output OSSD safety signals to the host computer, the EDM signal input unit 262 is used to receive EDM safety signals input from external devices, and the auxiliary signal output unit 263 is used to output auxiliary signals to external devices.

[0107] In one specific implementation, see Figure 11 The OSSD signal output unit 261 includes NPN transistors Q6, Q7, Q8, Q9, Q10, and Q11; resistors R70, R71, R72, R73, R74, R75, R76, and R77; a zero-ohm resistor R78, R79, R80, and R81; Schottky diodes D15, D17, and D16; a resistance wire F4; and a Zener diode D18; the second main control module 220... The OSSD signal output terminal SC1 is connected to the base of NPN transistor Q6 via resistor R71, and also to the base of NPN transistor Q9 via resistor R72. The collector of NPN transistor Q6 is connected to a 24V power supply via resistor R73, and also to the collector of PNP transistor Q7 and the base of PNP transistor Q8 via resistor R74. The emitter of NPN transistor Q6 is grounded. The emitter of PNP transistor Q7 is connected to a 24V power supply, and the base of PNP transistor Q7 is connected to the emitter of PNP transistor Q8. A resistor R77 is connected in parallel between the base and emitter of PNP transistor Q7. PNP transistor Q8... The collector of diode Q9 is connected to the OSSD signal output terminal OSSD1 via the anode and cathode of Schottky diode D15 and the zero-ohm resistor R78; the anode of diode D16 is connected to the OSSD signal output terminal OSSD1, and the cathode is connected to the 24V power supply; the collector of NPN transistor Q9 is connected to the 24V power supply via resistor R75, and also to the collector of NPN transistor Q11 and the base of NPN transistor Q10 via resistor R76; the emitter of NPN transistor Q9 is grounded; the emitter of NPN transistor Q11 is connected to ground, and the base of NPN transistor Q11 is connected to the NPN transistor... A resistor R79 is connected in parallel between the emitter of Q10 and the base and emitter of NPN transistor Q11; the collector of NPN transistor Q10 is connected to the OSSD signal output terminal OSSD1 via the cathode and anode of Schottky diode D17 and the resistance wire F4; the OSSD signal output terminal OSSD1 is grounded via resistor R80 and the cathode and anode of Zener diode D18, and a resistor R81 is also connected in parallel between the cathode and anode of Zener diode D18; the cathode of Zener diode D18 is connected to the OSSD signal feedback terminal FK1-ADC of the second main control module 220.

[0108] When the OSSD signal output terminal SC1 of the second main control module 220 outputs a high-level signal, both NPN transistors Q6 and Q8 are saturated and conducting, NPN transistor Q9 is saturated and conducting, and NPN transistor Q10 is turned off. At this time, the 24V power supply can output current to the OSSD signal output terminal OSSD1 through the first current limiting section composed of PNP transistor Q7 and resistor R77, and PNP transistor Q8. The first current limiting section composed of PNP transistor Q7 and resistor R77 is used to limit the conduction current of PNP transistor Q8, thereby limiting the output current provided to the OSSD signal output terminal OSSD1, which can prevent the large current generated when the OSSD signal output terminal OSSD1 is accidentally grounded from burning out the switching devices.

[0109] When the OSSD signal output terminal SC1 of the second main control module 220 outputs a low-level signal, NPN transistors Q6 and Q8 are both turned off, NPN transistor Q9 is turned off, and NPN transistor Q10 is saturated and conducting. At this time, there is no output current at the OSSD signal output terminal OSSD1. If the external level connected to the OSSD signal output terminal OSSD1 is high, external current will flow from the OSSD signal output terminal OSSD1, through NPN transistor Q10 and the second current limiting section composed of NPN transistor Q11 and resistor R79, and flow to the ground terminal. The second current limiting section composed of NPN transistor Q11 and resistor R79 is used to limit the magnitude of the conduction current of NPN transistor Q10, which can prevent the large current generated when the OSSD signal output terminal OSSD1 is mistakenly connected to a high level from burning out the switching transistor device.

[0110] Schottky diodes D15 and D17 provide reverse polarity protection, preventing damage to circuit components from reverse current input from the OSSD signal output terminal OSSD1. Zero-ohm resistor R78 and resistance wire F4 provide overcurrent protection, melting when the current exceeds the limit.

[0111] Resistors R80 and R81, along with Zener diode D18, constitute the OSSD signal feedback acquisition unit. When the OSSD signal output terminal OSSD1 outputs current or receives incoming current, the OSSD signal feedback terminal FK1-ADC outputs a feedback signal of a set level to the second main control module 220. The level of the feedback signal can be set via Zener diode D18.

[0112] Resistor R70 is used to set the initial input level of the OSSD signal output unit at the moment the device is powered on. It can be set to a high level by connecting to a 3.3V power supply. In another specific embodiment, it can also be set to a low level by connecting to a 3.3V ground terminal (not shown in the figure).

[0113] When the infrared light is blocked or the equipment malfunctions, the second main control module 220 outputs an abnormal OSSD (Output Signal Switching Device) signal to the host computer through the OSSD signal output unit 261, so as to facilitate shutdown and notification of operators.

[0114] In one specific implementation, see Figure 12 The EDM signal input unit 262 includes a resistance wire F2, a TVS diode D10, an optocoupler U15, resistors R63, R64, and R65. The EDM signal input unit 262 receives monitoring signals from external devices through its input terminal W+ and transmits them to the second main control module 220 through its output terminal WC1. The input terminal W+ is protected by current limiting by the resistance wire F2, overvoltage protection by the TVS diode D10, and voltage division by resistors R63 and R64, before being isolated from the output terminal WC1 by the optocoupler U15. When the monitored external device malfunctions, an EDM (External Device Monitor) signal is sent to the second main control module 220 through the EDM signal input unit 262.

[0115] In one specific implementation, see Figure 13 The auxiliary signal output unit 263 includes an NMOS transistor Q5, resistors R66, R67, R68, and R69, a Schottky diode D11, a diode D12, an electrostatic discharge protection diode D13, a Zener diode D14, and a resistance wire F3. The auxiliary signal output terminal SC0 of the second main control module 220 is connected to the gate of the NMOS transistor Q5, the source of the NMOS transistor Q5 is grounded, resistor R67 is connected in parallel between the gate and source of the NMOS transistor Q5, and the drain of the NMOS transistor Q5 is connected to the cathode of the Schottky diode D11. The anode of the Schottky diode D11... The electrode is connected to a 24V power supply via resistor R66. The anode of Schottky diode D11 is also connected to the auxiliary signal output terminal CN via resistor F3. The cathode of diode D12 is connected to the 24V power supply, and the anode is connected to the anode of Schottky diode D11. The auxiliary signal output terminal CN is grounded via electrostatic discharge protection diode D13. The auxiliary signal output terminal CN is also grounded via resistor R68 and the cathode and anode of Zener diode D14. Resistor R69 is also connected in parallel between the cathode and anode of Zener diode D14. The cathode of Zener diode D14 is connected to the auxiliary signal feedback terminal OUT_FK of the second main control module 220.

[0116] When the auxiliary signal output terminal SC0 of the second main control module 220 is high, the auxiliary signal output terminal CN is low; when the auxiliary signal output terminal SC0 of the second main control module 220 is low, the auxiliary signal output terminal CN is high. The resistor F3 is used to prevent overcurrent of the signal current, and the electrostatic discharge protection diode D13 is used to prevent overvoltage of the signal.

[0117] Resistors R68 and R69, along with Zener diode D14, constitute the auxiliary signal feedback acquisition unit, used to output a feedback signal with a set level to the second main control module 220. The level of the feedback signal can be set via Zener diode D14.

[0118] The second main control module 220 can output an AUX auxiliary signal to external devices through the auxiliary signal output unit 263. For example, when the infrared light is blocked or the equipment malfunctions, the auxiliary signal output unit 263 can output an AUX auxiliary signal to an external warning light, thereby causing the warning light to display different states.

[0119] In some embodiments, the transmitting unit 100 further includes a first indicator light module 170 connected to the first main control module 120, and the receiving unit 200 further includes a second indicator light module 280 connected to the second main control module 220. Both the first indicator light module 170 and the second indicator light module 280 are used to display whether the infrared light transmitted by the transmitting module 110 is received or blocked.

[0120] Figure 14 A specific implementation of the first indicator module 170 is provided, and the second indicator module 280 is similar. In the first indicator module 170, the indicator control ports RLED, GLED, and BLED of the first main control module 120 control the conduction of three light-emitting diodes in the tri-color LED 2 through NMOS transistors Q2, Q3, and Q4, respectively, to indicate different states of the safety light curtain. If an object intrudes, the indicator light will turn red; if no object intrudes, the indicator light will be in a constant green state; if the light from the receiving end and the transmitting end is not aligned, it will be in a blue state.

[0121] This utility model also proposes a safety light curtain embodiment, including any or all of the above-described safety light curtain control circuit embodiments.

[0122] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art and should not be interpreted in an idealized or overly formal sense unless specifically defined.

[0123] It should be noted that certain terms are used in this specification and claims to refer to specific elements. Those skilled in the art will understand that different manufacturers or producers may use different terms to refer to the same element. This specification and claims do not distinguish elements based on differences in terminology, but rather on differences in function.

[0124] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0125] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of this invention and form different embodiments. For example, any one of the embodiments claimed in the claims can be used in any combination of embodiments of this invention.

[0126] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the corresponding claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the corresponding claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A safety light curtain control circuit, characterized in that, It includes a transmitter (100) and a receiver (200); The launching unit (100) includes: Multiple transmitting modules (110) are used to transmit infrared light to the receiving unit (200); The first main control module (120) is used to control the operation of the plurality of transmitting modules (110); A transmission selection module (130) is connected to the plurality of transmission modules (110) and a first main control module (120) and is used to enable the transmission modules (110) one by one according to the control of the first main control module (120). The emission detection module (140) is connected to the plurality of emission modules (110) and the first main control module (120) and is used to detect the operating current of the enabled emission module (110); The first communication module (150) is connected to the first main control module (120) and is used to communicate with the receiving unit (200); The receiving unit (200) includes: Multiple receiving modules (210) are used to receive infrared light transmitted by the transmitting unit (100); The second main control module (220) is used to control the operation of the multiple receiving modules (210) and process the received signals; A receiving selection module (230) is connected to the plurality of receiving modules (210) and a second main control module (220) and is used to enable the receiving modules (210) one by one according to the control of the second main control module (220). The receiving detection module (240) is connected to the plurality of receiving modules (210) and the second main control module (220) for detecting whether the intensity of the infrared light signal received by the receiving module (210) exceeds the limit and transmitting the result to the second main control module (220). The second communication module (250) is connected to the second main control module (220) and is used to communicate with the transmitter (100); The safety signal module (260) is connected to the second main control module (220) and is used to transmit safety signals with the host computer and external devices.

2. The safety light curtain control circuit according to claim 1, characterized in that, The transmitting module (110) includes a transmitting switch and an infrared lamp. The transmitting switch turns the infrared lamp on or off according to the transmitting pulse signal generated by the first main control module (120). The receiving module (210) includes a photoelectric converter. The photoelectric converter converts the received infrared light into an electrical signal and transmits it to the second main control module (220).

3. The safety light curtain control circuit according to claim 2, characterized in that, The transmission selection module (130) includes a transmission trigger unit (131), a first transmission signal separation unit (132), and a second transmission signal separation unit (133). The transmit trigger unit (131) includes a first D flip-flop and a second D flip-flop. The clock terminals of the first and second D flip-flops receive the transmit selection clock signal from the first main control module (120). The D input terminal of the first D flip-flop receives the transmit selection signal from the first main control module (120). The Q output terminal of the first D flip-flop outputs the chip select signal of the first transmit signal separation unit (132). The Q output terminal of the second D flip-flop outputs the chip select signal of the second transmit signal separation unit (133). The Q output terminals of the first and second D flip-flops also output transmit trigger feedback signals to the first main control module (120). The first transmission signal separation unit (132) is connected to the transmission trigger unit (131), the first main control module (120) and a portion of the multiple transmission modules (110). The first transmission signal separation unit (132) selects to enable according to the chip select signal generated by the transmission trigger unit (131), and transmits the transmission pulse signal generated by the first main control module (120) to the selected transmission module (110) according to the transmission address signal of the first main control module (120). The second transmission signal separation unit (133) is connected to the transmission trigger unit (131), the first main control module (120) and another part of multiple transmission modules (110). The second transmission signal separation unit (133) selects to enable according to the chip select signal generated by the transmission trigger unit (131), and transmits the transmission pulse signal generated by the first main control module (120) to the selected transmission module (110) according to the transmission address signal of the first main control module (120).

4. A safety light curtain control circuit according to claim 2, characterized in that, The emission detection module (140) includes an emission module current-to-voltage unit (141), an emission detection reference voltage unit (142), and an emission detection comparison unit (143). The current-to-voltage unit (141) of the transmitting module is connected to each of the transmitting modules (110) and is used to convert the current flowing through the transmitting module (110) into the detection voltage of the transmitting module. The emission detection reference voltage unit (142) is used to provide the emission detection reference voltage; The transmission detection comparison unit (143) is connected to the transmission module current to voltage unit (141) and the transmission detection reference voltage unit (142), and is used to compare the transmission module detection voltage with the transmission detection reference voltage, and output the transmission detection signal to the first main control module (120) according to the comparison result.

5. A safety light curtain control circuit according to claim 2, characterized in that, The receiving selection module (230) includes a receiving trigger unit (231), a first receiving signal multiplexing unit (232), and a second receiving signal multiplexing unit (233). The receiving trigger unit (231) includes a third D flip-flop and a fourth D flip-flop. The clock terminals of the third D flip-flop and the fourth D flip-flop receive the receiving selection clock signal from the second main control module (220). The D input terminal of the third D flip-flop receives the receiving selection signal from the second main control module (220). The Q output terminal of the third D flip-flop outputs the chip select signal of the first receiving signal multiplexing unit (232). The Q output terminal of the fourth D flip-flop outputs the chip select signal of the second receiving signal multiplexing unit (233). The Q output terminals of the third D flip-flop and the fourth D flip-flop also output a receiving trigger feedback signal to the second main control module (220). The first receiving signal multiplexing unit (232) is connected to the receiving trigger unit (231), the second main control module (220) and a portion of the multiple receiving modules (210). The first receiving signal multiplexing unit (232) selects to enable according to the chip select signal generated by the receiving trigger unit (231), and transmits the electrical signal generated by the selected receiving module (210) to the second main control module (220) according to the receiving address signal of the second main control module (220). The second receiving signal multiplexing unit (233) is connected to the receiving trigger unit (231), the second main control module (220) and another part of multiple receiving modules (210). The second receiving signal multiplexing unit (233) selects to enable according to the chip select signal generated by the receiving trigger unit (231), and transmits the electrical signal generated by the selected receiving module (210) to the second main control module (220) according to the receiving address signal of the second main control module (220).

6. A safety light curtain control circuit according to claim 5, characterized in that, The receiving and detection module (240) includes a receiving and detection amplification unit (241), a receiving and detection reference voltage unit (242), and a receiving and detection comparison unit (243). The receiving detection amplification unit (241) is connected to each of the receiving modules (210) and is used to amplify the electrical signal generated by the receiving module (210) to obtain the receiving module detection voltage; The receiving detection reference voltage unit (242) is used to provide the receiving detection reference voltage; The receiving detection comparison unit (243) is connected to the receiving detection amplification unit (241) and the receiving detection reference voltage unit (242), and is used to compare the receiving module detection voltage with the receiving detection reference voltage, and output the receiving detection signal to the second main control module (220) according to the comparison result.

7. A safety light curtain control circuit according to claim 1, characterized in that, Both the first communication module (150) and the second communication module (250) are CAN communication modules.

8. A safety light curtain control circuit according to claim 1, characterized in that, The safety signal module (260) includes an OSSD signal output unit (261), an EDM signal input unit (262), and an auxiliary signal output unit (263). The OSSD signal output unit (261) is used to output OSSD safety signals to the host computer, the EDM signal input unit (262) is used to receive EDM safety signals input from external devices, and the auxiliary signal output unit (263) is used to output auxiliary signals to external devices.

9. A safety light curtain control circuit according to claim 1, characterized in that, The transmitting unit (100) further includes a first indicator light module (170) connected to the first main control module (120), and the receiving unit (200) further includes a second indicator light module (280) connected to the second main control module (220). The first indicator light module (170) and the second indicator light module (280) are both used to display whether the infrared light transmitted by the transmitting module (110) is received or blocked.

10. A safety light curtain, characterized in that, It has a safety light curtain control circuit as described in any one of claims 1 to 9.

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