Safety grating control circuit and safety grating

Abstract

The invention discloses a safety grating control circuit. A plurality of transmitting modules in 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 in 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. The problems that an existing safety grating is low in sensing sensitivity and accuracy are solved, and the safety of operators is improved.

Description

Technical Field

[0001] The invention relates to the technical field of industrial safety, and in particular to a safety grating control circuit. Background Art

[0002] Safety light curtain is a photoelectric protection device used for industrial safety. It consists of a transmitter and a receiver. It creates a perceptible area in the form of an infrared beam and is usually used to prevent people or objects from entering the dangerous area. The working principle of the safety light curtain is based on the infrared beam between the transmitter and the receiver. When a person or object enters and causes the beam to be blocked, the safety light curtain will output a danger signal to the external host computer. The external host computer controls the equipment to stop by receiving the danger signal, thereby improving the safety of the operators.

[0003] Chinese patent CN202010722725.7 discloses a safety grating control device, including a transmitting module and a receiving module, which generates a pulse signal in the transmitting module and detects the pulse signal in the receiving module to determine whether the light beam is blocked. The disadvantage of this solution is that the sensing sensitivity is low. Only when the light beam is completely blocked and the detection pulse signal is missing, an alarm signal will be issued and an abnormal state will be displayed, and it cannot determine whether the transmitter light source itself is faulty.

[0004] In view of this, it is necessary to propose a new safety grating control circuit to improve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a safety grating control circuit and a safety grating, so as to solve the problems of low sensitivity and low accuracy of the existing safety grating and improve the safety of operators.

[0006] The present invention provides the following scheme: According to a first aspect, the present invention provides a safety grating control circuit, comprising a transmitting part and a receiving part; The transmitting unit comprises: A plurality of transmitting modules, used for transmitting infrared light to the receiving part; A first main control module, used to control the operation of the multiple transmitting modules; a transmission selection module, connected to the plurality of transmission modules and the first main control module, and configured to enable the transmission modules one by one according to the control of the first main control module; A transmission detection module, connected to the plurality of transmission modules and the first main control module, and used to detect the working current of the enabled transmission module; A first communication module, connected to the first main control module, and used for communicating with the receiving unit; The receiving unit comprises: A plurality of receiving modules, used for receiving the infrared light sent by the transmitting unit; A second main control module, used to control the operation of the plurality of receiving modules and process received signals; a receiving selection module, connected to the plurality of receiving modules and the second main control module, and configured to enable the receiving modules one by one according to the control of the second main control module; A receiving detection module, connected to the plurality of receiving modules and the second main control module, configured to detect whether the intensity of the infrared light signal received by the receiving module exceeds a limit value, and transmit the result to the second main control module; A second communication module, connected to the second main control module, and used for communicating with the transmitting unit; The safety signal module is connected to the second main control module and is used to transmit safety signals to the host computer and external devices.

[0007] Optionally, the transmitting module includes a transmitting switch and an infrared lamp, and the transmitting switch turns on or off the infrared lamp according to the transmitting pulse signal generated by the first main control module; the receiving module includes a photoelectric converter, and the photoelectric converter converts the received infrared light into an electrical signal and transfers it to the second main control module.

[0008] Optionally, the transmission selection module includes a transmission trigger unit, a first transmission signal separation unit, and a second transmission signal separation unit; The transmission trigger unit includes a first D flip-flop and a second D flip-flop, the clock ends of the first D flip-flop and the second D flip-flop receive the transmission selection clock signal of the first main control module, the D input end of the first D flip-flop receives the transmission selection signal of the first main control module, the Q output end of the first D flip-flop outputs the chip selection signal of the first transmission signal separation unit; the Q output end of the second D flip-flop outputs the chip selection signal of the second transmission signal separation unit, and the Q output end of the first D flip-flop and the Q output end of the second D flip-flop also output a transmission trigger feedback signal to the first main control module; The first transmission signal separation unit is connected to the transmission trigger unit, the first main control module and a portion of the plurality of transmission modules. The first transmission signal separation unit selects to be enabled according to the chip selection 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; The second transmission signal separation unit is connected to the transmission trigger unit, the first main control module and multiple transmission modules of another part. The second transmission signal separation unit is enabled according to the chip selection 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 sending address signal of the first main control module.

[0009] 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; The transmitting module current-to-voltage unit is connected to each of the transmitting modules and is used to convert the current flowing through the transmitting module into a transmitting module detection voltage; The emission detection reference voltage unit is used to provide an emission detection reference voltage; The emission detection comparison unit is connected to the emission module current-to-voltage unit and the emission detection reference voltage unit, and is used to compare the emission module detection voltage with the emission detection reference voltage, and output an emission detection signal to the first main control module according to the comparison result.

[0010] Optionally, the receiving selection module includes a receiving trigger unit, a first receiving signal multiplexing unit, and a second receiving signal multiplexing unit; The receiving trigger unit includes a third D flip-flop and a fourth D flip-flop, the clock ends of the third D flip-flop and the fourth D flip-flop receive the receiving selection clock signal of the second main control module, the D input end of the third D flip-flop receives the receiving selection signal of the second main control module, and the Q output end of the third D flip-flop outputs the chip select signal of the first receiving signal multiplexing unit; the Q output end of the fourth D flip-flop outputs the chip select signal of the second receiving signal multiplexing unit, and the Q output end of the third D flip-flop and the Q output end of the fourth D flip-flop also output a receiving trigger feedback signal to the second main control module; 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 be enabled according to the chip selection 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; The second receiving signal multiplexing unit is connected to the receiving trigger unit, the second main control module and multiple receiving modules of another part. The second receiving signal multiplexing unit is enabled 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.

[0011] Optionally, the receiving detection module includes a receiving detection amplifying unit, a receiving detection reference voltage unit and a receiving detection comparing unit; The receiving detection amplifying unit is connected to each of the receiving modules and is used to amplify the electrical signal generated by the receiving module to obtain a receiving module detection voltage; The receiving detection reference voltage unit is used to provide a receiving detection reference voltage; The receiving detection comparison unit is connected to the receiving detection amplifying unit and the receiving detection reference voltage unit, and is used to compare the receiving module detection voltage with the receiving detection reference voltage, and output a receiving detection signal to the second main control module according to the comparison result.

[0012] Optionally, the first communication module and the second communication module are both CAN communication modules.

[0013] 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 an OSSD safety signal to a host computer, the EDM signal input unit is used to receive an EDM safety signal input by an external device, and the auxiliary signal output unit is used to output an auxiliary signal to an external device.

[0014] Optionally, the transmitting unit also includes a first indicator light module connected to the first main control module, and the receiving unit also includes a second indicator light module connected to the second main control module, and the first indicator light module and the second indicator light module are both used to display whether the infrared light sent by the transmitting module is received or blocked.

[0015] According to a second aspect, the present invention further provides a safety barrier, wherein the safety barrier comprises a safety grating control circuit as described in the first aspect above.

[0016] Compared with the prior art, the present invention has the following advantages: The present invention enables the transmitting modules and the corresponding receiving modules one by one, which can avoid the situation that the transmitting lamp beads next to the receiving end will affect the receiving end when multiple transmitting modules transmit at the same time, and it is impossible to accurately judge whether it is in a shading state, thereby improving the sensing sensitivity of the safety grating; the transmission detection module can monitor the working condition of the infrared lamp at the transmitting end, and find faults in time to avoid being misjudged as shading, thereby improving the sensing accuracy of the safety grating; the safety signal module transmits a safety signal to the host computer or external equipment, and promptly responds to the situation that the infrared light is blocked or the equipment fails, thereby controlling the equipment to stop and reporting the status to the staff, thereby improving the safety of the operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1is a principle block diagram of some embodiments of the present invention; Figure 2 is a circuit schematic diagram of the first power module of the present invention; Figure 3 It is a circuit schematic diagram of the first voltage detection module of the present invention; Figure 4 It is the circuit principle diagram of the transmitting module of the present invention; Figure 5 It is the circuit principle diagram of the transmission selection module of the present invention; Figure 6 It is the circuit principle diagram of the emission detection module of the present invention; Figure 7 It is the circuit schematic diagram of the receiving module of the present invention; Figure 8 It is a circuit schematic diagram of a receiving selection module of the present invention; Fig. 9 It is a circuit schematic diagram of a receiving detection module of the present invention; Fig.10 is a circuit schematic diagram of the first communication module of the present invention; Fig.11 This is a circuit schematic diagram of an OSSD signal output unit of the present invention; Fig.12 This is a circuit schematic diagram of an EDM signal input unit of the present invention; Fig.13 It is a circuit schematic diagram of the auxiliary signal output unit of the present invention; Fig.14 This is a circuit schematic diagram of the first indicator light module of the present invention.

[0019] In the figure: 100-transmitting unit; 110-transmitting module; 120-first main control module; 130-transmitting selection module; 150-first communication module; 160-first power supply module; 170-first indicator light module; 180-first voltage detection module; 200-receiving unit; 210-receiving module; 220-second main control module; receiving selection module 230; receiving 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 DESCRIPTION

[0020] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1The present invention provides an embodiment of a safety grating control circuit, including a transmitting unit 100 and a receiving unit 200.

[0022] The transmitting unit 100 includes a plurality of transmitting modules 110, a first main control module 120, a transmitting selection module 130 and a first communication module 150. The plurality of 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. The transmitting selection module 130 is connected to the plurality of transmitting modules 110 and the first main control module 120, and is used to enable the transmitting modules 110 one by one according to the control of the first main control module 120. The transmitting detection module 140 is connected to the plurality of transmitting modules 110 and the first main control module 120, and is used to detect the operating current of the enabled transmitting modules 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.

[0023] The receiving unit 200 includes a plurality of 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 plurality of receiving modules 210 and the plurality of transmitting modules 110 are used to receive infrared light sent by the transmitting unit 100. The second main control module 220 is used to control the operation of the plurality of receiving modules 210 and process the received signals. The receiving selection module 230 is connected to the plurality of 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 plurality of 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 the limit value, and transmits 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 to the host computer and external devices.

[0024] The working principle of the embodiment of the present invention is: the first main control module 120 controls multiple transmitting modules 110 to be enabled one by one through the transmitting selection module 130, and sends infrared light to the receiving part 200; the second main control module 220 controls multiple receiving modules 210 to be enabled one by one through the receiving selection module 230 to receive infrared light; the first main control module 120 can obtain the working conditions of multiple transmitting modules 110 through the transmitting detection module 140 to determine whether a fault occurs; the second main control module 220 can obtain whether the infrared light is blocked through the receiving detection module 240; through the first communication module 150 and the second communication module 250, the first main control module 120 and the second main control module 220 can communicate and synchronously transmit control and detection result signals; when the infrared light is blocked or the equipment fails, the safety signal is transmitted to the host computer or external device through the safety signal module 260.

[0025] The present invention enables the transmitting modules 110 and the corresponding receiving modules 210 one by one, which can avoid the transmitting lamp beads next to the receiving end from affecting the receiving end when multiple transmitting modules 110 transmit at the same time, making it impossible to accurately judge whether it is in a shading state, thereby improving the sensing sensitivity of the safety grating; the receiving detection module 240 can monitor the situation where the infrared light is blocked; the transmitting detection module 140 can monitor the working condition of the infrared lamp at the transmitting end, discover faults in time, avoid being misjudged as shading, and improve the sensing accuracy of the safety grating; the safety signal module 260 transmits a safety signal to the upper computer or external equipment, and promptly responds to the situation where the infrared light is blocked or the equipment fails, thereby controlling the equipment to shut down and reporting the status to the staff, thereby improving the safety of the operators.

[0026] In some embodiments, see Figure 1 The transmitting unit 100 further includes a first power module 160, and the receiving unit 200 further includes a second power module 270; the first power module 160 and the second power module 270 are both used to provide 24V power, 5V power and 3.3V power.

[0027] Figure 2 A specific implementation of the first power module 160 is provided, and the second power module 270 is similar thereto. The first power module 160 includes a 24V power unit 161, a 5V power unit 162, and a 3.3V power supply 163. In the 24V power unit 161, the external power supply VCC obtains a 24V power supply 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, and a TVS diode D2 are used to protect against overvoltage. In the 5V power unit 162, the 24V power supply is converted into a 5V power supply output through a buck converter U1 and peripheral circuits. In the 3.3V power unit 162, the 5V power supply is converted into a 3.3V power supply output through a low voltage difference linear regulator U2 and peripheral circuits.

[0028] As an example, the buck converter U1 may adopt a TPS543x series chip, and the low dropout linear regulator U2 may adopt a RT9193 series chip.

[0029] 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 size of the 24V power supply, the 5V power supply and the 3.3V power supply.

[0030] Figure 3 An integrated specific implementation of the first voltage detection module 180 is provided, and the second voltage detection module 290 is similar thereto. In the first voltage detection module 180, after the 24V power supply is divided by resistors R29 and R30, it is connected to the 24V power supply detection terminal ADC3 of the first main control module 120 via resistor R31; after the 5V power supply is divided by resistors R32 and R33, it is connected to the 5V power supply detection terminal ADC2 of the first main control module 120 via resistor R34; after the 3.3V power supply is divided by resistors R35 and R36, it is connected to the 3.3V power supply detection terminal ADC1 of the first main control module 120 via resistor R37.

[0031] In some embodiments, see Figure 4 The transmitting module 110 includes a transmitting switch and an infrared lamp. The transmitting switch turns on or off the infrared lamp according to the transmitting pulse signal generated by the first main control module 120.

[0032] In a specific implementation, the plurality of transmitting modules 110 each include a resistor R11, a PMOS tube Q1, a capacitor C18 and an infrared light LED1; the gate of the PMOS tube Q1 serves as an emission control terminal S1, the source is connected to the anode of the infrared light LED1, the drain is connected to a 5V power supply, the resistor R11 is connected in parallel between the gate and the drain of the PMOS tube Q1, the capacitor C18 is connected in parallel between the drain of the PMOS tube Q1 and the ground terminal, and the cathode of the infrared light LED1 serves as an emission detection terminal DL. When the emission control terminal S1 is at a low level, the PMOS tube Q1 is saturated and turned on, the infrared light LED1 is powered, and infrared light is sent out; when the emission control terminal S1 is at a high level, the PMOS tube Q1 is turned off, and the infrared light LED1 loses power and turns off.

[0033] In some embodiments, see Figure 5The 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 transmission trigger unit 131 includes a first D flip-flop and a second D flip-flop, the clock ends of the first D flip-flop and the second D flip-flop receive the transmission selection clock signal of the first main control module 120, the D input end of the first D flip-flop receives the transmission selection signal of the first main control module 120, the Q output end of the first D flip-flop outputs the chip selection signal of the first transmission signal separation unit 132; the Q output end of the second D flip-flop outputs the chip selection signal of the second transmission signal separation unit 133, and the Q output end of the first D flip-flop and the Q output end of the second D flip-flop also output the transmission trigger feedback signal 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 part of the plurality of transmission modules 110. The first transmission signal separation unit 132 is selected to be enabled according to the chip selection 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 the plurality of transmission modules 110. The second transmission signal separation unit 133 is selected to be enabled according to the chip selection 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.

[0034] In this embodiment, when the transmission selection signal is low, after the first transmission selection clock signal rises, the Q output end of the first D flip-flop is low, the first transmission signal separation unit 132 is enabled, after the second transmission selection clock signal rises, the Q output end of the second D flip-flop is low, and the second transmission signal separation unit 133 is enabled; when the transmission selection signal is high, after the first transmission selection clock signal rises, the Q output end of the first D flip-flop is high, the first transmission signal separation unit 132 is disabled, after the second transmission selection clock signal rises, the Q output end of the second D flip-flop is high, and the second transmission signal separation unit 133 is disabled. When the first transmission signal separation unit 132 or the second transmission signal separation unit 133 is enabled, the transmission pulse signal generated by the first main control module 120 can be transmitted to the selected transmission module 110 according to the transmission address signal of the first main control module 120, so as to realize the control of multiple transmission modules 110 to be enabled one by one.

[0035] In a specific embodiment, the emission trigger unit 131 includes a dual-channel D trigger U3, a resistor R6, a resistor R7, a resistor R8, a capacitor C16, a capacitor C17, a Schottky diode D3 and a Schottky diode D4, the dual-channel D trigger U3 includes two independent D triggers, the first D input pin of the dual-channel D trigger U3 is connected to the emission selection signal terminal D1 of the first main control module 120 via the resistor R7, the first clock input pin and the second clock input pin of the dual-channel D trigger U3 are both connected to the emission selection clock terminal CLK of the first main control module 120, and the first Q output pin of the dual-channel D trigger U3 is connected via the resistor R6 The cathode of the Schottky diode D3, one end of the capacitor C16, the second D input pin of the dual-channel D trigger U3 and the chip select terminal A1 of the first transmission signal separation unit 132, the anode of the Schottky diode D3 is connected to the transmission trigger feedback terminal DFK of the first main control module 120, and the other end of the capacitor C16 is grounded; the second Q output pin of the dual-channel D trigger U3 is connected to the cathode of the Schottky diode D4, one end of the capacitor C17 and the chip select terminal A2 of the second transmission signal separation unit 133 through the resistor R6, the anode of the Schottky diode D4 is connected to the transmission trigger feedback terminal DFK of the first main control module 120, and the other end of the capacitor C17 is grounded.

[0036] The first transmission signal separation unit 132 includes a signal separator U4, a resistor R9, a resistor R84, a resistor R85, a resistor R86, a resistor R87 and a resistor R88. The sending 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 pin of the signal separator U4 is connected to the transmission control terminals (S1, S2, ..., S8) of a part of the multiple transmission modules 110. The first gating pin of the signal separator U4 is connected to a 5V power supply. The second A gating pin of the signal separator U4 is connected to one end of the resistor R87. The other end of the resistor R87 serves as the chip select terminal A1 of the first transmission signal separation unit 132. The second B gating pin of the signal separator U4 is connected to the transmission pulse signal terminal EN of the first main control module 120 via resistor R88. The second B gating pin of the signal separator U4 is also connected to the 5V power supply via resistor R9.

[0037] The second transmission signal separation unit 133 includes a signal separator U5, a resistor R10, a resistor R89, a resistor R90, a resistor R91, a resistor R92 and a resistor R93. The sending 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 the resistors R89, R90 and R91 respectively. The eight-wire signal pins of the signal separator U5 are connected to the transmission control terminals (S9, S10, ..., S16) of multiple transmission modules 110 of another part. The first gating pin of the signal separator U5 is connected to a 5V power supply. The second A gating pin of the signal separator U5 is connected to one end of the resistor R92. The other end of the resistor R92 serves as the chip select terminal A2 of the second transmission signal separation unit 133. The second B gating pin of the signal separator U5 is connected to the transmission pulse signal EN of the first main control module 120 via the resistor R93. The second B gating pin of the signal separator U5 is also connected to the 5V power supply via the resistor R10.

[0038] The signal separator U4 and the signal separator U5 are both 3-8 decoders, which can output the transmission pulse signal of the first main control unit 120 to the connected transmission module 110 according to the selection of the transmission address signal, and cooperate with the chip selection signal generated by the transmission trigger unit 131 to control multiple transmission modules 110 to be enabled one by one.

[0039] As an example, the dual-channel D flip-flop U3 may adopt a CD4013 series chip, and the signal separator U4 and the signal separator U5 may adopt a 74HC138 series chip.

[0040] In some other implementations, the transmission trigger unit 131 may also use a larger number of D flip-flops, and correspondingly connect a larger number of transmission signal separation units, so as to enable a larger number of transmission modules 110 one by one.

[0041] In some embodiments, see Figure 6 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 emission module current-to-voltage unit 141 is connected to each emission module 110, and is used to convert the current flowing through the emission module 110 into an emission module detection voltage. The emission detection reference voltage unit 142 is used to provide an emission detection reference voltage. The emission detection comparison unit 143 is connected to the emission module current-to-voltage unit 141 and the emission detection reference voltage unit 142, and is used to compare the emission module detection voltage with the emission detection reference voltage, and output an emission detection signal to the first main control module 120 according to the comparison result.

[0042] In a specific embodiment, the transmitting module current-to-voltage unit 141 includes a resistor R12 and a Schottky diode D5, one end of the resistor R12 is connected to the transmitting detection terminal DL of multiple transmitting modules 110 and the anode of the Schottky diode D5, the other end of the resistor R12 is connected to the ground, and the cathode of the Schottky diode D5 serves as the transmitting module detection voltage terminal TX_FK.

[0043] The emission detection reference voltage unit 142 includes a voltage regulator U6, a resistor R13, a resistor R14, a resistor R15, a resistor R16 and a resistor R17. The anode pin of the voltage regulator U6 is grounded, the resistor R13 is connected in parallel between the cathode pin and the reference end pin of the voltage regulator U6, the resistor R14 is connected in parallel between the anode pin and the reference end pin of the voltage regulator U6, the cathode pin of the voltage regulator U6 is connected to a 5V power supply via a resistor R15, and a 2.5V reference power supply is formed at the reference end pin of the voltage regulator U6. The 2.5V reference power supply is divided by resistors R16 and R17 to obtain an emission detection reference voltage.

[0044] As an example, the voltage regulator U6 may adopt a LM431 series chip.

[0045] The emission detection comparison unit 143 includes a comparator U4, a resistor R18, a resistor R19 and a capacitor C19, the emission detection reference voltage is connected to the negative input terminal of the comparator U4, the emission module detection voltage terminal TX_FK is connected to the positive input terminal of the comparator U4, the resistor R19 is connected in parallel between the positive input terminal and the ground terminal of the comparator U4, the comparator U4 is powered by a 3.3V power supply, and the output terminal of the comparator U4 is connected to the emission detection receiving terminal TX_FK-3.3 of the first main control module 120 through the resistor R19. It can be realized that when the voltage detected by the emission module is higher than the emission detection reference voltage, a high level signal is sent to the emission detection receiving terminal TX_FK-3.3 of the first main control module 120.

[0046] 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 transfers it to the second main control module 220 .

[0047] In a specific implementation, the plurality of receiving modules 210 each include 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 will be connected to the second main control module 220.

[0048] 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 spare second main control module via the resistor R62, which can prevent single point failure problems in a signal link and improve the reliability of the device.

[0049] In some embodiments, see Figure 8 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 ends of the third D flip-flop and the fourth D flip-flop receive the receiving selection clock signal of the second main control module 220, the D input end of the third D flip-flop receives the receiving selection signal of the second main control module 220, and the Q output end of the third D flip-flop outputs the chip selection signal of the first receiving signal multiplexing unit 232; the Q output end of the fourth D flip-flop outputs the chip selection signal of the second receiving signal multiplexing unit 233, and the Q output end of the third D flip-flop and the Q output end of the fourth D flip-flop also output the 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 part of the multiple receiving modules 210. The first receiving signal multiplexing unit 232 is selected to be enabled according to the chip selection 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 the multiple receiving modules 210. The second receiving signal multiplexing unit 233 is selected to be enabled according to the chip selection 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.

[0050] In this embodiment, when the receiving selection signal is low, after the first receiving selection clock signal rises, the Q output end of the third D flip-flop is low, the first receiving signal multiplexing unit 232 is enabled, after the second receiving selection clock signal rises, the Q output end of the fourth D flip-flop is low, and the second receiving signal multiplexing unit 233 is enabled; when the receiving selection signal is high, after the first receiving selection clock signal rises, the Q output end of the third D flip-flop is high, the first receiving signal multiplexing unit 232 is disabled, after the second receiving selection clock signal rises, the Q output end of the fourth D flip-flop is high, and the second receiving signal multiplexing unit 233 is disabled. When the first receiving signal multiplexing unit 232 or the second receiving signal multiplexing unit 233 is enabled, the electrical signal generated by the selected receiving module 210 can be transmitted to the second main control module 220 according to the receiving address signal of the second main control module 220, thereby realizing the control of multiple receiving modules 210 to be enabled one by one.

[0051] In a specific implementation, the receiving trigger unit 231 includes a dual-channel D trigger U11, a resistor R49, a resistor R50, a resistor R51, a resistor R52, a capacitor C31, a capacitor C32, a Schottky diode D8 and a Schottky diode D9. The dual-channel D trigger U11 includes two independent D triggers. The first D input pin of the dual-channel D trigger U11 is connected to the receiving selection signal terminal D1 of the second main control module 220 via the resistor R50. The first clock input pin and the second clock input pin of the dual-channel D trigger U11 are both connected to the receiving selection clock terminal MCU1_CLK of the first main control module 120. The first Q output pin of the dual-channel D trigger U11 is connected to the Schottky diode D through the resistor R49. 8, one end of the capacitor C31, one end of the resistor R52 and the chip select terminal MCU1_A1 of the first receiving signal multiplexing unit 232, the other end of the resistor R52 is connected to the second D input pin of the dual-channel D flip-flop U11, the anode of the Schottky diode D8 is connected to the receiving trigger feedback terminal DFK1 of the second main control module 220, and the other end of the capacitor C31 is grounded; the second Q output pin of the dual-channel D flip-flop U11 is connected to the cathode of the Schottky diode D9, one end of the capacitor C32 and the chip select terminal MCU1_A2 of the second receiving signal multiplexing unit 233 through the resistor R51, the anode of the Schottky diode D9 is connected to the receiving trigger feedback terminal DFK1 of the second main control module 220, and the other end of the capacitor C32 is grounded.

[0052] The first receiving signal multiplexing unit 232 includes a multiplexer U12, a resistor R53, a resistor R54 and a resistor 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 pin of the multiplexer U12 is connected to the signal output terminal O1 of a part of the multiple receiving modules 210. The signal output pin of the multiplexer U12 is connected to the receiving detection module 240 as the output terminal GXH1 of the receiving selection module 230. The enable pin of the multiplexer U12 is used as the chip select terminal MCU1_A1 of the first receiving signal multiplexing unit 232.

[0053] The second receiving signal multiplexing unit 233 includes a multiplexer U13, a resistor R56, a resistor R57 and a resistor 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 pin of the multiplexer U13 is connected to the signal output terminal O1 of multiple receiving modules 210 of another part. The signal output pin of the multiplexer U13 is connected to the receiving detection module 240 as the output terminal GXH1 of the receiving selection module 230. The enable pin of the multiplexer U13 is used as the chip select terminal MCU1_A2 of the second receiving signal multiplexing unit 233.

[0054] Multiplexer U12 and multiplexer U13 are both 8:1 analog signal multiplexers, which can select and transmit the electrical signal generated by one receiving module 210 to the second main control module 220 according to the received address signal, and cooperate with the chip select signal generated by the receiving trigger unit 231 to control multiple receiving modules 210 to be enabled one by one.

[0055] As an example, the dual-channel D flip-flop U11 may adopt a CD4013 series chip, and the multiplexer U12 and the multiplexer U13 may adopt a 74HC4051 series chip.

[0056] In some other implementations, the receiving trigger unit 231 may also use a larger number of D flip-flops, and correspondingly connect a larger number of receiving signal multiplexing units, so as to enable a larger number of access modules 210 one by one.

[0057] In some embodiments, see Fig. 9The receiving detection module 240 includes a receiving detection amplifying unit 241, a receiving detection reference voltage unit 242 and a receiving detection comparing unit 243. The receiving detection amplifying unit 241 is connected to each receiving module 210, and is used to amplify the electrical signal generated by the receiving module 210 to obtain a receiving module detection voltage. The receiving detection reference voltage unit 242 is used to provide a receiving detection reference voltage. The receiving detection comparing unit 243 is connected to the receiving detection amplifying 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 a receiving detection signal to the second main control module 220 according to the comparison result.

[0058] In a specific implementation, the receiving detection amplifier unit 241 includes an operational amplifier U8, a resistor R38, a resistor R39, a resistor R40, a resistor R41, a resistor R43, a capacitor C25, a capacitor C28 and a Schottky diode D7, the positive input end of the operational amplifier U8 is connected to one end of the capacitor C25, the other end of the capacitor C25 is connected to one end of the resistor R38, one end of the resistor R39 and the output end GXH1 of the receiving selection module 230, the other end of the resistor R38 is connected to the receiving signal feedback end IR-FK1 of the second main control module 220, the other end of the resistor R39 is grounded, the negative input end of the operational amplifier U8 is grounded via the resistor R40, and is connected to the output end of the operational amplifier U8 via the resistor R41, the output end of the operational amplifier U8 is connected to the anode of the Schottky diode D7, the cathode of the Schottky diode D7 is grounded via the parallel resistor R43 and the capacitor R28, the cathode of the Schottky diode D7 is used as the output end IN1 of the receiving detection amplifier unit 241, and the receiving module detection voltage is output.

[0059] The receiving detection reference voltage unit 242 includes a voltage regulator U9, a resistor R43, a resistor R44, a resistor R45, a resistor R46 and a resistor R47. The anode pin of the voltage regulator U9 is grounded, the resistor R43 is connected in parallel between the cathode pin and the reference end pin of the voltage regulator U9, the resistor R44 is connected in parallel between the anode pin and the reference end pin of the voltage regulator U9, the cathode pin of the voltage regulator U9 is connected to a 5V power supply via a resistor R45, and a 2.5V reference power supply is formed at the reference end pin of the voltage regulator U9. The 2.5V reference power supply is divided by resistors R46 and R47 to obtain a receiving detection reference voltage.

[0060] As an example, the voltage regulator U9 may adopt a LM431 series chip.

[0061] 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, the output terminal IN1 of the receiving detection amplifying unit 241 is connected to the positive input terminal of the comparator U10, the comparator U4 is powered by a 3.3V power supply, the capacitor C30 is connected in parallel between the power supply and the ground, and the output terminal of the comparator U10 is connected to the receiving detection receiving terminal INFO-1 of the second main control module 220 through the resistor R48. It can be realized that when the receiving module detection voltage is higher than the receiving detection reference voltage, a high level signal is sent to the receiving detection receiving terminal INFO-1 of the second main control module 220.

[0062] In some embodiments, the first communication module 150 and the second communication module 250 are both 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 can be understood that the communication between the transmitting unit 100 and the receiving unit 200 of the embodiment of the present application can be divided into optical synchronization and line synchronization. When the infrared light sent by the transmitting unit 100 is not received by the receiving unit 200, the transmitting unit 100 will send a synchronization signal to the receiving unit 200, telling the receiving unit 200 that the infrared light has been sent. At this time, if the receiving unit 200 does not receive the infrared light, the corresponding signal will be fed back to the transmitting unit, and at this time, the transmitting unit 100 and the receiving unit 200 will display the shading state at the same time. The CAN communication module is suitable for the line synchronization type, and can also be used to determine whether it is optical synchronization or line synchronization type.

[0063] Fig.10 A specific implementation of the first communication module 150 is provided, and the second communication module 250 is similar thereto. The first communication module 150 includes a CAN communication chip U7, a sending signal terminal TXD1 and a receiving signal terminal RXD1 of the first main control module 120 are connected to the CAN communication chip U7, a CANH pin and a CANL pin of the CAN communication chip U7 are connected to a high-level line CANH and a low-level line CANL of a CAN bus via a transformer T2, a high-level line CANH and a low-level line CANL of the CAN bus are grounded via a resistor R20, a resistor R21 and a capacitor C21, and a high-level line CANH and a low-level line CANL of the CAN bus are also grounded via a CAN bus electrostatic discharge protection diode D6.

[0064] As an example, the CAN communication chip U7 may adopt a TJA1050 series chip.

[0065] 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 an OSSD safety signal to the upper computer, the EDM signal input unit 262 is used to receive an EDM safety signal input by an external device, and the auxiliary signal output unit 263 is used to output an auxiliary signal to an external device.

[0066] In one embodiment, see Fig.11 The OSSD signal output unit 261 includes an NPN tube Q6, a PNP tube Q7, a PNP tube Q8, an NPN tube Q9, an NPN tube Q10, an NPN tube Q11, a resistor R70, a resistor R71, a resistor R72, a resistor R73, a resistor R74, a resistor R75, a resistor R76, a resistor R77, a zero-ohm resistor R78, a resistor R79, a resistor R80, a resistor R81, a Schottky diode D15, a Schottky diode D17, a diode D16, a resistor F4 and a voltage regulator tube D18; the second main control module 220 The OSSD signal output terminal SC1 is connected to the base of the NPN tube Q6 through the resistor R71, and is also connected to the base of the NPN tube Q9 through the resistor R72; the collector of the NPN tube Q6 is connected to the 24V power supply through the resistor R73, and is also connected to the collector of the PNP tube Q7 and the base of the PNP tube Q8 through the resistor R74, and the emitter of the NPN tube Q6 is grounded; the emitter of the PNP tube Q7 is connected to the 24V power supply, the base of the PNP tube Q7 is connected to the emitter of the PNP tube Q8, and the resistor R77 is connected in parallel between the base and emitter of the PNP tube Q7; the PNP tube Q8 The collector of is connected to the OSSD signal output terminal OSSD1 through the anode and cathode of Schottky diode D15 and 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 tube Q9 is connected to the 24V power supply through resistor R75, and is also connected to the collector of NPN tube Q11 and the base of NPN tube Q10 through resistor R76, and the emitter of NPN tube Q9 is grounded; the emitter of NPN tube Q11 is connected to the ground, and the base of NPN tube Q11 is connected to NPN tube A resistor R79 is connected in parallel between the emitter of Q10 and the base and emitter of the NPN tube Q11; the collector of the NPN tube Q10 is connected to the OSSD signal output terminal OSSD1 through the cathode and anode of the Schottky diode D17 and the resistor F4; the OSSD signal output terminal OSSD1 is grounded through the resistor R80 and the cathode and anode of the Zener tube D18, and a resistor R81 is also connected in parallel between the cathode and anode of the Zener tube D18; the cathode of the Zener tube D18 is connected to the OSSD signal feedback terminal FK1-ADC of the second main control module 220.

[0067] When the OSSD signal output terminal SC1 of the second main control module 220 outputs a high-level signal, both the NPN tube Q6 and the PNP tube Q8 are saturated and turned on, the NPN tube Q9 is saturated and turned on, and the NPN tube 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 unit composed of the PNP tube Q7 and the resistor R77 and the PNP tube Q8. The first current limiting unit composed of the PNP tube Q7 and the resistor R77 is used to limit the conduction current of the PNP tube Q8, and then limit the output current provided to the OSSD signal output terminal OSSD1, which can prevent the large current from burning the switch tube device when the OSSD signal output terminal OSSD1 is mistakenly connected to the ground terminal.

[0068] When the OSSD signal output terminal SC1 of the second main control module 220 outputs a low-level signal, the NPN tube Q6 and the PNP tube Q8 are both turned off, the NPN tube Q9 is turned off, and the NPN tube Q10 is saturated and turned on. At this time, the OSSD signal output terminal OSSD1 has no output current. If the level of the external connection of the OSSD signal output terminal OSSD1 is high, an external current flows from the OSSD signal output terminal OSSD1, and flows to the ground terminal through the NPN tube Q10 and the second current limiting part composed of the NPN tube Q11 and the resistor R79. The second current limiting part composed of the NPN tube Q11 and the resistor R79 is used to limit the conduction current of the NPN tube Q10, which can prevent the large current from burning the switch tube device when the OSSD signal output terminal OSSD1 is mistakenly connected to a high level.

[0069] Schottky diodes D15 and D17 are used to provide reverse polarity protection to prevent the reverse input current from the OSSD signal output terminal OSSD1 from damaging the circuit components. Zero ohm resistor R78 and resistor wire F4 are used to provide overcurrent protection and will fuse when the current exceeds the limit.

[0070] The resistor R80, the resistor R81 and the voltage regulator D18 constitute an OSSD signal feedback collection unit. When the OSSD signal output terminal OSSD1 outputs current or receives current flowing in, the OSSD signal feedback terminal FK1-ADC can output a feedback signal of a set level to the second main control module 220. The voltage regulator D18 can set the level of the feedback signal.

[0071] The resistor R70 is used to set the initial input level of the OSSD signal output unit at the moment of powering on the device, and can be set to a high level by connecting to a 3.3V power supply. In another specific implementation, it can also be set to a low level by connecting to a 3.3V ground terminal (not shown in the figure).

[0072] When the infrared light is blocked or a device fails, the second main control module 220 outputs an abnormal OSSD (Output Signal Switching Device) signal to the upper computer through the OSSD signal output unit 261 to facilitate shutdown and notify the operator.

[0073] In one embodiment, see Fig.12 , the EDM signal input unit 262 includes a resistor F2, a TVS tube D10, an optical coupler U15, a resistor R63, a resistor R64 and a resistor R65; the EDM signal input unit 262 receives the monitoring signal of the external device through the input terminal W+, and transmits it to the second main control module 220 through the output terminal WC1; the input terminal W+ is protected by the current limiting protection of the resistor F2, the overvoltage protection of the TVS tube D10, and the voltage division of the resistor R63 and the resistor R64, and then the signal is isolated from the output terminal WC1 through the optical coupler U15. When the monitored external device is abnormal, the EDM (External Device Monitor) signal will be sent to the second main control module 220 through the EDM signal input unit 262.

[0074] In one embodiment, see Fig.13 The auxiliary signal output unit 263 includes an NMOS tube Q5, a resistor R66, a resistor R67, a resistor R68, a resistor R69, a Schottky diode D11, a diode D12, an electrostatic discharge protection diode D13, a voltage regulator D14 and a resistor F3; the auxiliary signal output terminal SC0 of the second main control module 220 is connected to the gate of the NMOS tube Q5, the source of the NMOS tube Q5 is connected to the ground, the resistor R67 is connected in parallel between the gate and the source of the NMOS tube Q5, the drain of the NMOS tube Q5 is connected to the cathode of the Schottky diode D11; the anode of the Schottky diode D11 The anode of the Schottky diode D11 is also connected to the auxiliary signal output terminal CN through the resistor F3; the cathode of the diode D12 is connected to the 24V power supply, and the anode is connected to the anode of the Schottky diode D11; the auxiliary signal output terminal CN is grounded through the electrostatic discharge protection diode D13, and the auxiliary signal output terminal CN is also grounded through the resistor R68, as well as the cathode and anode of the Zener diode D14, and a resistor R69 is also connected in parallel between the cathode and anode of the Zener diode D14; the cathode of the Zener diode D14 is connected to the auxiliary signal feedback terminal OUT_FK of the second main control module 220.

[0075] When the auxiliary signal output terminal SC0 of the second main control module 220 is at a high level, the auxiliary signal output terminal CN is at a low level; when the auxiliary signal output terminal SC0 of the second main control module 220 is at a low level, the auxiliary signal output terminal CN is at a high level. The resistor F3 is used to prevent the signal current from over-current, and the electrostatic discharge protection diode D13 is used to prevent the signal from over-voltage.

[0076] The resistor R68, the resistor R69 and the voltage regulator D14 constitute an auxiliary signal feedback collection unit, which is used to output a feedback signal of a set level to the second main control module 220. The voltage regulator D14 can set the level of the feedback signal.

[0077] The second main control module 220 can output an AUX auxiliary signal to an external device through the auxiliary signal output unit 263. For example, when the infrared light is blocked or the device fails, the auxiliary signal output unit 263 can output an AUX auxiliary signal to an external warning light, so that the warning light displays different states.

[0078] In some embodiments, the transmitting unit 100 also includes a first indicator light module 170 connected to the first main control module 120, and the receiving unit 200 also 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 sent by the transmitting module 110 is received or blocked.

[0079] Fig.14 An integrated specific implementation of the first indicator light module 170 is provided, and the second indicator light module 280 is similar thereto. In the first indicator light module 170, the indicator light control ports RLED, GLED, and BLED of the first main control module 120 respectively control the conduction of three light-emitting diodes in the three-color LED light LED2 through NMOS tubes Q2, NMOS tubes Q3, and NMOS tubes Q4 to indicate different states of the safety grating. If an object intrudes, the indicator light will turn red; if no object intrudes, the indicator light is always green; if the light alignment of the receiving end and the transmitting end is not aligned, it will be blue.

[0080] The present invention also provides a safety barrier embodiment, including any one or all of the above safety barrier control circuit embodiments.

[0081] Those skilled in the art will understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined.

[0082] It should be noted that certain words are used in this specification and claims to refer to specific components. Those skilled in the art should understand that different manufacturers and producers may use different terms to refer to the same component. This specification and claims do not use the difference in terms as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction.

[0083] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, 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.

[0084] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, any one of the embodiments claimed in the claims can be used in any combination in the embodiments of the present invention.

[0085] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and set in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and further may be divided into multiple submodules or subunits or subcomponents. All features disclosed in this specification (including the corresponding claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination, except that at least some of such features and / or processes or units are mutually exclusive. Unless otherwise expressly stated, each feature disclosed in this specification (including the corresponding claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A safety grating control circuit, characterized in that: It comprises a transmitting unit (100) and a receiving unit (200); The transmitting unit (100) comprises: A plurality of transmitting modules (110) used for transmitting infrared light to the receiving unit (200); A first main control module (120), used for controlling the operation of the plurality of transmitting modules (110); a transmission selection module (130), connected to the plurality of transmission modules (110) and the first main control module (120), and configured to enable the transmission modules (110) one by one according to the control of the first main control module (120); A transmission detection module (140), connected to the plurality of transmission modules (110) and the first main control module (120), and used to detect the operating current of the enabled transmission module (110); A first communication module (150), connected to the first main control module (120) and used for communicating with the receiving unit (200); The receiving unit (200) comprises: A plurality of receiving modules (210) for receiving infrared light transmitted by the transmitting unit (100); A second main control module (220), used for controlling the operation of the plurality of receiving modules (210) and processing received signals; a receiving selection module (230), connected to the plurality of receiving modules (210) and the second main control module (220), and configured to enable the receiving modules (210) one by one according to the control of the second main control module (220); a receiving detection module (240), connected to the plurality of receiving modules (210) and the second main control module (220), and configured to detect whether the intensity of the infrared light signal received by the receiving module (210) exceeds a limit value, and transmit the result to the second main control module (220); A second communication module (250), connected to the second main control module (220) and used for communicating 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 to a host computer and external devices.

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

3. A safety grating control circuit according to claim 2, characterized in that: The transmission selection module (130) comprises a transmission trigger unit (131), a first transmission signal separation unit (132) and a second transmission signal separation unit (133); The transmission trigger unit (131) comprises a first D flip-flop and a second D flip-flop, wherein the clock ends of the first D flip-flop and the second D flip-flop receive the transmission selection clock signal of the first main control module (120), the D input end of the first D flip-flop receives the transmission selection signal of the first main control module (120), the Q output end of the first D flip-flop outputs the chip selection signal of the first transmission signal separation unit (132); the Q output end of the second D flip-flop outputs the chip selection signal of the second transmission signal separation unit (133), and the Q output end of the first D flip-flop and the Q output end of the second D flip-flop also output a transmission trigger feedback signal 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 plurality of transmission modules (110); the first transmission signal separation unit (132) is enabled according to a chip selection signal generated by the transmission trigger unit (131), and transmits a transmission pulse signal generated by the first main control module (120) to the selected transmission module (110) according to a 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) is enabled according to a chip selection 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 a transmission address signal of the first main control module (120).

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

5. A safety grating control circuit according to claim 2, characterized in that: The receiving selection module (230) comprises 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) comprises a third D flip-flop and a fourth D flip-flop, the clock ends of the third D flip-flop and the fourth D flip-flop receive the receiving selection clock signal of the second main control module (220), the D input end of the third D flip-flop receives the receiving selection signal of the second main control module (220), the Q output end of the third D flip-flop outputs the chip selection signal of the first receiving signal multiplexing unit (232); the Q output end of the fourth D flip-flop outputs the chip selection signal of the second receiving signal multiplexing unit (233), and the Q output end of the third D flip-flop and the Q output end of 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 plurality of receiving modules (210), the first receiving signal multiplexing unit (232) is enabled according to a chip selection 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 a 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) is enabled according to the chip selection 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 grating control circuit according to claim 5, characterized in that: The receiving detection module (240) comprises a receiving detection amplifying unit (241), a receiving detection reference voltage unit (242) and a receiving detection comparing unit (243); The receiving detection amplifying 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 a receiving module detection voltage; The receiving detection reference voltage unit (242) is used to provide a 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 a receiving detection signal to the second main control module (220) according to the comparison result.

7. A safety grating control circuit according to claim 1, characterized in that: The first communication module (150) and the second communication module (250) are both CAN communication modules.

8. A safety grating control circuit according to claim 1, characterized in that: The safety signal module (260) comprises 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 an OSSD safety signal to a host computer, the EDM signal input unit (262) is used to receive an EDM safety signal input from an external device, and the auxiliary signal output unit (263) is used to output an auxiliary signal to the external device.

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

10. A safety barrier, characterized in that: A safety light curtain control circuit is provided as claimed in any one of claims 1 to 9.

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