Safety grating autonomous detection circuit

Abstract

The utility model relates to the technical field of safety grating detection, in particular to a safety grating autonomous detection circuit which comprises an infrared lamp driving circuit, an infrared light receiving circuit, an autonomous detection MCU circuit and a system MCU circuit. The system MUC circuit is electrically connected with the output signal switching device to control the output of the output signal switching device; the autonomous detection MCU circuit is electrically connected with the system MCU circuit to receive a scanning instruction generated by the system MCU circuit; the autonomous detection MCU circuit is provided with a time sequence control MCU for outputting a time sequence control signal; the plurality of infrared lamp driving circuits are electrically connected with a signal output pin of the time sequence control MCU; the plurality of infrared light receiving circuits are arranged in one-to-one correspondence with the infrared lamp driving circuits and are used for receiving light signals; and the infrared light receiving circuit is electrically connected with a signal receiving pin of the time sequence control MCU. According to the invention, the autonomous detection function of the safety grating is realized, the detection reliability is effectively improved, and the potential safety risk is reduced.

Description

Technical Field

[0001] This application relates to the field of safety light grating detection technology, and in particular to a safety light grating autonomous detection circuit. Background Technology

[0002] An OSSD, or output signal switch, is used to control the switching output of a safety light curtain. The OSSD plays a crucial role in a safety light curtain system. It processes signals from the light curtain sensor and determines whether to trigger safety measures based on the signal content.

[0003] Currently, safety light curtains consist of an emitter and a receiver. The emitter emits infrared beams, and the receiver receives these beams. When the beams are blocked by an object, the receiver cannot receive the light signal. When the OSSD receives a signal indicating that an object has entered the safety area, it outputs a control signal, instructing the relevant safety equipment to perform corresponding operations, such as stopping the machine or issuing a warning, to ensure personnel safety.

[0004] However, if there is a grating malfunction, the object cannot be detected in a timely and effective manner, and the OSSD cannot work in time, which will pose certain safety risks. Utility Model Content

[0005] This application provides an autonomous detection circuit for a safety light curtain. The technical solution adopted is as follows:

[0006] A safety light curtain autonomous detection circuit, comprising an infrared lamp driving circuit, an infrared light receiving circuit, an autonomous detection MCU circuit, and a system MCU circuit;

[0007] The system MCU circuit is electrically connected to the output signal switch device to control the output of the output signal switch device; the autonomous detection MCU circuit is electrically connected to the system MCU circuit to receive the scan command generated by the system MCU circuit; the autonomous detection MCU circuit has a timing control MCU to output timing control signals;

[0008] Multiple infrared lamp driving circuits are provided, and all of them are electrically connected to the signal output pins of the timing control MCU.

[0009] Multiple infrared light receiving circuits are provided and are configured one-to-one with the infrared lamp driving circuits to receive light signals; the infrared light receiving circuits are electrically connected to the signal receiving pins of the timing control MCU.

[0010] Preferably, the infrared lamp driving circuit includes a driving transistor and an infrared diode. The base of the driving transistor is electrically connected to the signal output pin of the timing control MCU, and the emitter is grounded. The positive terminal of the infrared diode is electrically connected to the power supply, and the negative terminal is connected to the collector of the driving transistor.

[0011] Preferably, two infrared diodes are provided and connected in series.

[0012] Preferably, the infrared lamp driving circuit further includes a first capacitor, one electrode of which is connected to the positive terminal of the infrared diode, and the other electrode is grounded.

[0013] Preferably, the infrared light receiving circuit includes an infrared receiving lamp and a signal amplification module. The infrared receiving lamp is connected to the input terminal of the signal amplification module, and the output terminal of the signal amplification module is electrically connected to the signal receiving pin of the timing control MCU.

[0014] Preferably, the signal amplification module includes an integrated operational amplifier and an amplification factor feedback unit; the integrated operational amplifier has a first inverting output pin, a first non-inverting output pin, a first output pin, a second inverting output pin, a second non-inverting output pin, a second output pin, a ground pin, and a power supply pin; the positive terminal of the infrared receiving lamp is connected to the first non-inverting output pin, and the negative terminal is connected to the first inverting output pin;

[0015] The amplification feedback unit includes a first resistor, a second resistor, and a second capacitor. The two terminals of the first resistor are connected to the first inverting output pin and the first output pin, respectively. The second capacitor is connected in parallel with the first resistor. The two terminals of the second resistor are connected to the first non-inverting output pin and the ground pin, respectively.

[0016] The first output pin is connected to the second non-inverting output pin; the second output pin is electrically connected to the signal receiving pin of the timing control MCU.

[0017] Preferably, it also includes a high-gain adjustment module, which includes a driver chip, a first gain resistor, a second gain resistor, and a third gain resistor;

[0018] The driver chip has a first base, a first collector, a first emitter, a second base, a second collector, and a second emitter; the first emitter and the second emitter are electrically connected to the timing control MCU.

[0019] One end of the first gain resistor is connected to the second collector, and the other end is connected to the second inverting output pin; one end of the second gain resistor is connected to the second inverting output pin, and the other end is connected to the second output pin; one end of the third gain resistor is connected to the first emitter, and the other end is connected to the second inverting output pin.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. By coordinating the autonomous detection MCU circuit with the system MCU circuit, precise control and real-time monitoring of the infrared lamp driving circuit and the infrared light receiving circuit are achieved, effectively solving the problem of the inability to detect grating faults in a timely manner in the existing technology, and significantly improving the safety and reliability of the system;

[0022] 2. Multiple infrared lamp driving circuits and infrared light receiving circuits are set up one-to-one, and time-division driving and signal reception are realized through timing control signals, which can accurately determine the state of each beam and ensure the accuracy of the detection results;

[0023] 3. The signal amplification module in the infrared light receiving circuit effectively amplifies weak light signals, improves the sensitivity and accuracy of signal processing, and further enhances the system's detection capability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the system MCU circuit in the embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the self-detection MCU circuit in the embodiments of this application;

[0026] Figure 3 This is a schematic diagram of the infrared lamp driving circuit in an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the infrared light receiving circuit in the embodiments of this application.

[0028] The attached diagram is labeled as follows: 1. Infrared lamp driver circuit; 11. Driver transistor; 12. Infrared diode; 13. First capacitor; 2. Infrared light receiving circuit; 21. Infrared receiving lamp; 22. Integrated operational amplifier; 23. Amplification factor feedback unit; 231. First resistor; 232. Second resistor; 233. Second capacitor; 24. High gain adjustment module; 241. Driver chip; 242. First gain resistor; 243. Second gain resistor; 244. Third gain resistor; 3. Autonomous detection MCU circuit; 4. System MCU circuit. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0030] This application provides an autonomous detection circuit for a safety light curtain, comprising an infrared lamp driving circuit 1, an infrared light receiving circuit 2, an autonomous detection MCU circuit 3, and a system MCU circuit 4. The system MCU circuit serves as the core of the entire circuit; the MCU model can be selected as MS51FB9AE, and it stores user configuration data. Based on this configuration data, it generates periodic scanning commands. The autonomous detection MCU circuit 3 is electrically connected to the system MCU circuit 4 to receive the scanning commands generated by the system MCU circuit.

[0031] The infrared lamp driver circuit 1 is electrically connected to the output of the autonomous detection MCU circuit 3, receives the control signal from the autonomous detection MCU circuit 3, and generates infrared light through the control signal. The infrared light receiver circuit 2 is electrically connected to the input of the autonomous detection MCU circuit 3. The infrared light receiver circuit 2 senses the infrared light generated by the infrared lamp driver circuit 1, thereby generating a feedback signal, which is transmitted to the autonomous detection MCU circuit 3. The autonomous detection MCU circuit 3 generates detection data based on the feedback signal, and the system MCU circuit 4 then receives this detection data and drives the output of the OSSD based on this data.

[0032] Specifically, the self-detection MCU circuit 3 has a timing control MCU, model N32GO3OK8L7, capable of outputting timing control signals. Multiple infrared lamp driving circuits 1 and infrared light receiving circuits 2 are provided, each corresponding to a specific circuit. The infrared lamp driving circuit 1 is electrically connected to the signal output pin of the timing control MCU, and the infrared light receiving circuit 2 is electrically connected to the signal receiving pin of the timing control MCU. The timing control MCU, through timing control signals, controls multiple sets of infrared lamp driving circuits 1 to emit infrared light in a flowing light pattern. The multiple sets of infrared light receiving circuits 2 then receive the infrared light in a flowing light pattern.

[0033] The infrared lamp driving circuit 1 includes a driving transistor 11 and an infrared diode 12. For example, the driving transistor 11 can be an NPN or PNP type transistor, and the infrared diode 12 can be an infrared diode with a wavelength of 940nm or 850nm. The base of the driving transistor 11 is electrically connected to the signal output pin of the timing control MCU, and its emitter is grounded. The anode of the infrared diode 12 is electrically connected to the power supply, and its cathode is connected to the collector of the driving transistor 11. In this way, the timing control MCU can control the emitting state of the infrared diode 12 by controlling the conduction state of the driving transistor 11.

[0034] Two infrared diodes 12 are provided and connected in series. Two infrared diodes 12 of the same model can be selected for series connection, which can improve the overall luminous intensity. The series connection structure also reduces the voltage load on a single infrared diode 12, extending its lifespan.

[0035] Furthermore, the infrared lamp driving circuit 1 also includes a first capacitor 13. One electrode of the first capacitor 13 is connected to the positive terminal of the infrared diode 12, and the other electrode is grounded. The function of the first capacitor 13 is to provide a large instantaneous current when the infrared diode 12 emits light, thereby ensuring the stability of the luminous intensity of the infrared diode 12.

[0036] Furthermore, the infrared light receiving circuit 2 includes an infrared receiving lamp 21 and a signal amplification module. The infrared receiving lamp 21 can be a silicon PIN photodiode. In this application, the signal amplification module adopts a transimpedance amplifier circuit, including an integrated operational amplifier 22 and a gain feedback unit 23.

[0037] Specifically, the integrated operational amplifier 22 can be an LM358A, featuring a first inverting output pin, a first non-inverting output pin, a first output pin, a second inverting output pin, a second non-inverting output pin, a second output pin, a ground pin, and a power supply pin. The positive terminal of the infrared receiver 21 is connected to the first non-inverting output pin, and the negative terminal is connected to the first inverting output pin. The amplification factor feedback unit 23 includes a first resistor 231, a second resistor 232, and a second capacitor 233. The two terminals of the first resistor 231 are connected to the first inverting output pin and the first output pin, respectively; the second capacitor 233 is connected in parallel with the first resistor 231; and the two terminals of the second resistor 232 are connected to the first non-inverting output pin and the ground pin, respectively. The first output pin is connected to the second non-inverting output pin; the second output pin is electrically connected to the signal receiving pin of the timing control MCU. This design allows control of the amplification factor of the integrated operational amplifier 22 via the first resistor 231 and the second resistor 232; a larger resistance value results in a larger amplification factor, and vice versa.

[0038] Furthermore, the infrared light receiving circuit 2 also includes a high-gain adjustment module 24, which includes a driver chip 241, a first gain resistor 242, a second gain resistor 243, and a third gain resistor 244. The driver chip 241, which can be a UMH9N, has a first base, a first collector, a first emitter, a second base, a second collector, and a second emitter; the first and second emitters are electrically connected to the timing control MCU; one end of the first gain resistor 242 is connected to the second collector, and the other end is connected to the second inverting output pin; one end of the second gain resistor 243 is connected to the second inverting output pin, and the other end is connected to the second output pin; one end of the third gain resistor 244 is connected to the first emitter, and the other end is connected to the second inverting output pin. Thus, the high-gain control of the integrated operational amplifier 22 can be achieved by controlling the driver chip 241 through the timing control MCU.

[0039] The implementation principle of this embodiment is as follows: Real-time monitoring of the infrared lamp driving circuit 1 and the infrared light receiving circuit 2 is achieved through the autonomous detection MCU circuit 3, ensuring the system operates under normal working conditions. The infrared lamp driving circuit 1 controls the emission state of the infrared lamps, and the infrared light receiving circuit 2 receives the light signal, amplifies it, and transmits it to the autonomous detection MCU circuit 3. The entire system achieves autonomous detection of the grating system through closed-loop control, significantly improving the system's reliability and security.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A safety barrier autonomous detection circuit, characterized by: Infrared lamp driving circuit (1), infrared light receiving circuit (2), autonomous detection MCU circuit (3) and system MCU circuit (4); The system MUC circuit is electrically connected with the output signal switch device to control the output of the output signal switch device; the autonomous detection MCU circuit (3) is electrically connected with the system MCU circuit (4) to receive the scanning instruction generated by the system MUC circuit; the autonomous detection MCU circuit (3) has a time sequence control MCU to output a time sequence control signal; The infrared lamp driving circuit (1) is provided with a plurality of infrared lamp driving circuits (1), and each infrared lamp driving circuit (1) is electrically connected with a signal output pin of the time sequence control MCU. The infrared light receiving circuit (2) is provided with a plurality of infrared light receiving circuits (2) and is correspondingly arranged with the infrared lamp driving circuit (1), and is used for receiving a light signal; the infrared light receiving circuit (2) is electrically connected with a signal receiving pin of the time sequence control MCU.

2. The safety barrier autonomous detection circuit of claim 1, wherein: The infrared lamp driving circuit (1) comprises a driving triode (11) and an infrared diode (12), the base of the driving triode (11) is electrically connected with a signal output pin of the time sequence control MCU, the emitter is grounded, the anode of the infrared diode (12) is electrically connected with a power supply, and the cathode is connected with the collector of the driving triode (11).

3. The safety barrier autonomous detection circuit of claim 2, wherein: The infrared diode (12) is provided with two infrared diodes (12) and is connected in series.

4. The safety barrier autonomous detection circuit of claim 2, wherein: The infrared lamp driving circuit (1) further comprises a first capacitor (13), one electrode of the first capacitor (13) is connected with the anode of the infrared diode (12), and the other electrode is grounded.

5. The safety barrier autonomous detection circuit of claim 1, wherein: The infrared light receiving circuit (2) comprises an infrared receiving lamp (21) and a signal amplification module, the infrared receiving lamp (21) is connected with the input end of the signal amplification module, and the output end of the signal amplification module is electrically connected with a signal receiving pin of the time sequence control MCU.

6. The safety barrier autonomous detection circuit of claim 5, wherein: The signal amplification module comprises an integrated operational amplifier (22) and an amplification multiple feedback unit (23); the integrated operational amplifier (22) has a first reverse output pin, a first non-reverse output pin, a first output pin, a second reverse output pin, a second non-reverse output pin, a second output pin, a ground pin and a power supply pin; the anode of the infrared receiving lamp (21) is connected with the first non-reverse output pin, and the cathode is connected with the first reverse output pin; The amplification multiple feedback unit (23) comprises a first resistor (231), a second resistor (232) and a second capacitor (233), two poles of the first resistor (231) are respectively connected with the first reverse output pin and the first output pin; the second capacitor (233) is connected with the first resistor (231) in parallel; two poles of the second resistor (232) are respectively connected with the first non-reverse output pin and the ground pin; The first output pin is connected with the second non-reverse output pin; and the second output pin is electrically connected with a signal receiving pin of the time sequence control MCU.

7. The safety barrier autonomous detection circuit of claim 6, wherein: Further comprising a large gain adjustment module (24), the large gain adjustment module (24) comprises a driving chip (241), a first gain resistor (242), a second gain resistor (243) and a third gain resistor (244); The driving chip (241) has a first base, a first collector, a first emitter, a second base, a second collector and a second emitter; the first emitter and the second emitter are electrically connected with a timing control MCU; One end of the first gain resistor (242) is connected with the second collector, and the other end is connected with a second reverse output pin; one end of the second gain resistor (243) is connected with the second reverse output pin, and the other end is connected with a second output pin; one end of the third gain resistor (244) is connected with the first emitter, and the other end is connected with the second reverse output pin.

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