Device for detecting working state of lamp holder of ultraviolet curing equipment

Abstract

The utility model relates to the technical field of industrial semiconductors, and discloses a device for detecting the working state of a lamp holder of ultraviolet light curing equipment, which integrates temperature, wind pressure and ultraviolet light intensity detection functions by optimizing the structure of a hardware circuit. The circuit comprises a switch type capacitor voltage converter, a linear voltage regulator, a phototriode, an NTC thermistor, a partial pressure sensor and a CAN communication module. Through the bidirectional TVS diode, RC filtering and two-stage voltage stabilization design, the anti-electromagnetic interference capability is improved, and the signal transmission reliability is improved; temperature, wind pressure and illumination detection circuits are integrated on a single board, the structure is simplified, and the space is saved; the standby energy consumption of the sensor is reduced through hardware power management; by comprehensively optimizing the circuit structure and the signal transmission path, the detection reliability of the working state of the lamp holder of the ultraviolet curing equipment is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial semiconductor technical field especially, a device for detecting ultraviolet light curing equipment lamp holder working condition. BACKGROUND

[0002] Ultraviolet light curing equipment has extensive application in modern industry, and it mainly comprises two key parts of lamp holder (lamp box) for generating ultraviolet light and controller for controlling the lamp holder. The lamp holder plays a core role in the equipment operation, and it generates high-power radio frequency microwave energy through the internal magnetron to provide energy for the ultraviolet lamp, so as to make the ultraviolet lamp emit ultraviolet light and realize the curing treatment of specific materials. The lamp holder of the ultraviolet light curing equipment needs to work in a high-temperature and high-pressure environment for a long time.

[0003] In the prior art, the long-distance cable transmission is susceptible to electromagnetic interference, which leads to distortion of the lamp holder state detection signal, and each detection circuit is independently designed, so that the integration degree is low, the occupied space is large, and the detection accuracy of the detection circuit is affected due to unstable long-distance power transmission voltage. UTILITY MODEL CONTENT

[0004] In view of the problem of the existing detection circuit being discrete and poor in anti-interference ability, the utility model provides a device for detecting the working state of the lamp holder of the ultraviolet light curing equipment, which improves the detection reliability of the working state of the lamp holder of the ultraviolet light curing equipment by optimizing the circuit structure and signal transmission path. The following technical solutions are used to realize the device:

[0005] A device for detecting the working state of the lamp holder of the ultraviolet light curing equipment, comprising: a first connector (CONN1), a switching capacitor voltage converter (U1), a linear voltage stabilizer (U2), an ultraviolet light detection circuit (100) and a main control chip (U3); wherein the first connector (CONN1) is connected with the lamp holder controller (DT) through a cable; the input end of the switching capacitor voltage converter (U1) is connected with the first connector (CONN1) through a first transformer (L1), a second transformer (L2) and a bidirectional TVS diode (D1); the input end of the linear voltage stabilizer (U2) is connected with the output end of the switching capacitor voltage converter (U1); the ultraviolet light detection circuit (100) comprises a photosensitive triode (D2), the output end of the photosensitive triode (D2) is connected with the analog signal input end of the main control chip (U3) through a voltage dividing resistor (R1), and the input end of the photosensitive triode (D2) is connected with the output end of the linear voltage stabilizer (U2).

[0006] In a preferred technical solution, the switch capacitor voltage converter (U1) is of the model LM2662M, and a first capacitor (C1) with a capacitance of 10 µF is connected in parallel between the positive capacitor terminal (CAP+) and the negative capacitor terminal (CAP-) of the switch capacitor voltage converter (U1).

[0007] In a preferred technical solution, the ultraviolet light detection circuit (100) further comprises an RC filter circuit connected between the output terminal of the photosensitive triode (D4) and the main control chip (U3); wherein the RC filter circuit is composed of a second resistor (R2) and a second capacitor (C2) connected in parallel.

[0008] In a preferred technical solution, the resistance value of the voltage dividing resistor (R1) is 12.1KΩ±1%, the resistance value of the second resistor (R2) of the RC filter circuit is 5.1KΩ±5%, and the capacitance value of the second capacitor (C2) is 100nF.

[0009] In a preferred technical solution, the device further comprises a temperature detection circuit (200) comprising an NTC thermistor (R3) connected in series with a fixed resistor (R4) for voltage division, and a filtering capacitor (C3) connected between the voltage division node and the ground for connecting the analog-to-digital conversion pin of the main control chip (U3).

[0010] In a preferred technical solution, the resistance value of the NTC thermistor (R3) is 5KΩ, the resistance value of the fixed resistor (R4) is 1KΩ±1%, and the capacitance value of the filtering capacitor (C3) is 100nF.

[0011] In a preferred technical solution, the other end of the fixed resistor (R4) is connected to the output terminal of the linear voltage stabilizer (U2).

[0012] In a preferred technical solution, the device further comprises a wind pressure detection circuit (300) comprising a voltage dividing sensor (U4), and the power supply terminal of the voltage dividing sensor (U4) is controlled by a logic chip (U5) for on-off control, and the enable terminal (OE) of the logic chip (U5) is connected to the RB1 pin of the main control chip (U3) through a fifth resistor (R5).

[0013] In a preferred technical solution, the logic chip (U5) is of the model AO3400.

[0014] In a preferred technical solution, the voltage dividing sensor (U4) is of the model MPXV7002DP, and the input terminal of the voltage dividing sensor (U4) is connected to the output terminal of the linear voltage stabilizer (U2) through a sixth resistor (R6) and a seventh resistor (R7).

[0015] The utility model discloses a two -way TVS diode, RC filter and two -stage voltage stabilizing design can promote the ability of resisting electromagnetic interference, improve signal transmission reliability, integrate temperature, air pressure, illumination detection circuit in single board, simplify structure and save space, reduce sensor standby energy consumption through hardware power management, improve the detection reliability of ultraviolet light curing equipment lamp holder working state through comprehensive optimization circuit structure and signal transmission path. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A structure schematic view of a device for detecting the working state of the lamp holder of the ultraviolet light curing equipment is provided for the utility model embodiment.

[0017] Figure 2 A connection schematic view between the switch mode capacitor voltage converter and the first connector is provided for the utility model embodiment.

[0018] Figure 3 A structure schematic view of the ultraviolet light detection circuit is provided for the utility model embodiment.

[0019] Figure 4 A structure schematic view of the RC filter circuit is provided for the utility model embodiment.

[0020] Figure 5 A structure schematic view of the temperature detection circuit is provided for the utility model embodiment.

[0021] Figure 6 A structure schematic view of the air pressure detection circuit is provided for the utility model embodiment.

[0022] In the drawing: first connector (CONN1);Switch mode capacitor voltage converter (U1);Linear voltage regulator (U2);Main control chip (U3);Voltage division sensor (U4);Logic chip (U5);Ultraviolet light detection circuit (100);CAN bus transceiver circuit (CAN);Lamp holder controller (DT);Ferrite magnetic ring (TY);First transformer (L1);Second transformer (L2);Third transformer (L3);Fourth transformer (L4);Bidirectional TVS diode (D1);Photosensitive triode (D2);Third diode (D3);Fourth diode (D4);Voltage division resistance (R1);Second resistance (R2);NTC thermistor (R3);Fixed resistance (R4);Fifth resistance (R5);Sixth resistance (R6);Seventh resistance (R7);First capacitor (C1);Second capacitor (C2);Filter capacitor (C3);Fourth capacitor (C4);Fifth capacitor (C5);Sixth capacitor (C6). DETAILED DESCRIPTION

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1 , Figure 1 This is a schematic diagram of a device for detecting the working status of a UV curing equipment lamp head, provided by an embodiment of the present invention. Figure 1 As shown, the device includes: a first connector (CONN1), a switched capacitor voltage converter (U1), a linear regulator (U2), an ultraviolet light detection circuit (100), and a main control chip (U3). The first connector (CONN1) is connected to a lamp holder controller (DT) via a CAN bus. The lamp holder controller (DT) controls the lamp holder, causing it to generate high-power radio frequency microwave energy through its internal magnetron to power the ultraviolet lamp, thus emitting ultraviolet light and achieving the curing process for specific materials. The input terminal of the switched capacitor voltage converter (U1) is connected to the first connector (CONN1) via a first transformer (L1), a second transformer (L2), and a bidirectional TVS diode (D1). The input terminal of the linear regulator (U2) is connected to the output terminal of the switched capacitor voltage converter (U1); the ultraviolet light detection circuit (100) includes a phototransistor (D2), the output terminal of the phototransistor (D2) is connected to the analog signal input terminal of the main control chip (U3) through a voltage divider resistor (R1), and the input terminal of the phototransistor (D2) is connected to the output terminal of the linear regulator (U2).

[0025] Please see Figure 2 , Figure 2 This is a schematic diagram illustrating the connection between the switched capacitor voltage converter and the first connector provided in an embodiment of the present invention; specifically, as shown... Figure 2As shown, the input end of the first transformer (L1) is connected with the first output end (11) and the second output end (12) of the first connector (CONN1) through the cathode and the anode of the third diode (D3) respectively, the output end of the first transformer (L1) is connected with one end of the bidirectional TVS diode (D1) and the positive voltage input end (V+) of the switch mode capacitor voltage converter (U1) through the two ends of the fourth capacitor (C4) respectively. The input end of the second transformer (L2) is connected with the third output end (13) and the fourth output end (14) of the first connector (CONN1) respectively, and the output end of the second transformer (L2) is connected with the other end of the bidirectional TVS diode (D1). In a more preferred embodiment, the positive voltage input end (V+) of the switch mode capacitor voltage converter (U1) is connected with one end of the fourth capacitor (C4) through the fourth diode (D4), specifically, the positive voltage input end (V+) of the switch mode capacitor voltage converter (U1) is connected with the cathode of the fourth diode (D4), and the anode of the fourth diode (D4) is connected with one end of the fourth capacitor (C4). One end of the fourth capacitor (C4) is also connected with the first ground pin (GND1) of the switch mode capacitor voltage converter (U1). It should be noted that in the embodiment of the utility model, the switch mode capacitor voltage converter (U1) adopts a switch mode capacitor voltage converter produced by Texas Instruments with model number LM2662M, which is used as a positive voltage multiplier to double the voltage of the positive voltage input end (V+) of the switch mode capacitor voltage converter (U1). The switch mode capacitor voltage converter can provide an output current of 200mA, and has a typical output resistance of 3.5Ω. This means that it can provide a relatively stable current output for the load, and when the output current changes, the output voltage changes relatively small. Therefore, in the embodiment of the utility model, the switch mode capacitor voltage converter (U1) plays a role in stabilizing the 24V low-voltage DC power supply for long-distance transmission. In addition, a first capacitor (C1) with a capacitance of 10µF is connected in parallel between the positive capacitor end (CAP+) and the negative capacitor end (CAP-) of the switch mode capacitor voltage converter (U1). The control end (LV) and the negative voltage output end (OUT) of the switch mode capacitor voltage converter (U1) are grounded.

[0026] Please refer to Figure 3 , Figure 3 The structure diagram of the ultraviolet light detection circuit provided by the embodiment of the utility model is shown in the figure; specifically, Figure 3As shown, the ultraviolet light detection circuit (100) includes a phototransistor (D2) and an RC filter circuit (RC). The RC filter circuit is connected between the output terminal of the phototransistor (D2) and the main control chip (U3). The output terminal of the phototransistor (D2) is connected to the analog signal input terminal of the main control chip (U3) through a voltage divider resistor (R1), and the input terminal of the phototransistor (D2) is connected to the output terminal of the linear regulator (U2).

[0027] Please see Figure 4 , Figure 4 This is a schematic diagram of the RC filter circuit provided in an embodiment of the present invention; specifically, as shown below. Figure 4 As shown, the RC filter circuit consists of a second resistor (R2) and a second capacitor (C2) connected in parallel. The output of the linear regulator (U2) is connected to the collector of the phototransistor (D2), one end of the second resistor (R2), and one end of the second capacitor (C2). The other end of the second capacitor (C2) is connected to the base of the phototransistor (D2), and the emitter of the phototransistor (D2) is connected to the analog signal input of the main control chip (U3). In this embodiment, the intensity of ultraviolet light inside the UV curing lamp head is detected by the voltage level signal of the emitter of the phototransistor (D2). For example, an operational amplifier (such as LM393 or LM311) is used as a comparator, and a threshold voltage is set through a resistor divider network. The main control chip (U3) converts the voltage level signal of the emitter of the phototransistor (D2) into a voltage signal. When this voltage signal reaches the threshold set by the operational amplifier, the comparator output state flips, triggering a warning signal. It should be noted that the resistance of the voltage divider resistor (R1) is 12.1KΩ±1%, the resistance of the second resistor (R2) in the RC filter circuit is 5.1KΩ±5%, and the capacitance of the second capacitor (C2) is 100nF.

[0028] Please see Figure 5 , Figure 5 This is a schematic diagram of the temperature detection circuit provided in an embodiment of the present invention; specifically, as shown below. Figure 5As shown, the device further comprises a temperature detection circuit (200), which comprises an NTC thermistor (R3) and a fixed resistor (R4) in series for voltage division, and a filtering capacitor (C3) is connected to the ground and then connected to the analog-to-digital conversion pin of the main control chip (U3). In a preferred technical solution, the resistance value of the NTC thermistor (R3) is 5KΩ, the resistance value of the fixed resistor (R4) is 1KΩ±1%, and the capacitance value of the filtering capacitor (C3) is 100nF. The other end of the fixed resistor (R4) is connected to the output end of the linear voltage stabilizer (U2). Specifically, the first output end (11) and the second output end (12) of the first connector (CONN1) are connected to the NTC thermistor (R3) and the fixed resistor (R4) through a third transformer (L3), the NTC thermistor (R3) and the fixed resistor (R4) are connected in series for voltage division, and the voltage division node (AN) is connected to the ground through a filtering capacitor (C3) and then connected to the analog-to-digital conversion pin of the main control chip (U3). The third output end (13) and the fourth output end (14) of the first connector (CONN1) are connected to one end of a seventh resistor (R7) through a fourth transformer (L4); the other end of the seventh resistor (R7) is connected to the other end of the fixed resistor (R4), and the other end of the seventh resistor (R7) is grounded through a fifth capacitor (C5). Wherein, the main control chip (U3) converts the voltage signal of the NTC resistor R6 into the temperature inside the ultraviolet curing lamp head, and outputs it to the temperature sensor. When the temperature reaches the threshold set by the sensor, a pre-warning is triggered, and the working temperature of the ultraviolet curing device lamp head is detected.

[0029] Please refer to Figure 6 , Figure 6 The structure schematic diagram of the wind pressure detection circuit provided by the embodiment of the utility model; specifically, Figure 6As shown, the device further comprises a wind pressure detection circuit (300), which comprises a voltage division sensor (U4), the power supply end of which is controlled by a logic chip (U5), the enable end (OE) of which is connected to the RB1 pin of the main control chip (U3) through the fifth resistor (R5). In a preferred technical solution, the model of the logic chip (U5) is AO3400. The model of the voltage division sensor (U4) is MPXV7002DP, and the input end of the voltage division sensor (U4) is connected to the output end of the linear voltage stabilizer (U2) through the sixth resistor (R6) and the seventh resistor (R7). Specifically, the output end of the linear voltage stabilizer (U2) is connected to the first input end (SDA) and the second input end (SCL) of the voltage division sensor (U4) through the sixth resistor (R6) and the seventh resistor (R7), respectively. The positive voltage supply pin (VDD) of the voltage division sensor (U4) is connected to one end of the ninth capacitor C9 and the tenth capacitor C10, respectively, and the other end of the ninth capacitor C9 and the tenth capacitor C10 is connected to the reference ground. The ninth capacitor C9 and the tenth capacitor C10 are connected to the third input end (A) of the logic chip (U5) in parallel, the fifth output end (B) of the logic chip (U5) and the power supply end (VCC1) of the logic chip (U5), the power supply end (VCC1) of the logic chip (U5) is connected to the reference ground through the sixth capacitor (C6), and the enable end (OE) of the logic chip (U5) is connected to the RB1 pin of the main control chip (U3) through the fifth resistor (R5). The main control chip (U3) converts the pressure electric signal of the wind pressure sensor U5 into a voltage signal, and the same reason, in the actual implementation process, an operational amplifier (such as LM393, LM311) can be used as a comparator to realize it, and the threshold voltage is set through the resistance voltage division network. When the voltage signal reaches the threshold set by the operational amplifier, the state of the comparator output flips, triggering a pre-warning signal. In addition, the logic chip (U5) can be used to cut off the power supply of the voltage division sensor (U4) according to the level of the signal PWRON output by the enable end (OE) of the logic chip (U5), to realize the on-off control of the power supply end of the voltage division sensor (U4).

Claims

1. A device for detecting the working status of a lamp head in an ultraviolet curing equipment, characterized in that, include: The first connector (CONN1), the switched capacitor voltage converter (U1), the linear regulator (U2), the ultraviolet light detection circuit (100) and the main control chip (U3). The first connector (CONN1) is connected to the lamp holder controller (DT) via a cable; the input terminal of the switched capacitor voltage converter (U1) is connected to the first connector (CONN1) via a first transformer (L1), a second transformer (L2), and a bidirectional TVS diode (D1); the input terminal of the linear regulator (U2) is connected to the output terminal of the switched capacitor voltage converter (U1); the ultraviolet light detection circuit (100) includes a phototransistor (D2), the output terminal of the phototransistor (D2) is connected to the analog signal input terminal of the main control chip (U3) via a voltage divider resistor (R1), and the input terminal of the phototransistor (D2) is connected to the output terminal of the linear regulator (U2).

2. The apparatus as claimed in claim 1, characterized in that, The switched capacitor voltage converter (U1) is model LM2662M, and a first capacitor (C1) with a capacitance of 10µF is connected in parallel between its positive capacitor terminal (CAP+) and negative capacitor terminal (CAP-).

3. The apparatus as described in claim 1, characterized in that, The ultraviolet light detection circuit (100) also includes an RC filter circuit connected between the output terminal of the phototransistor (D2) and the main control chip (U3); wherein the RC filter circuit is composed of a second resistor (R2) and a second capacitor (C2) connected in parallel.

4. The apparatus as described in claim 3, characterized in that, The voltage divider resistor (R1) has a resistance of 12.1KΩ±1%, the second resistor (R2) of the RC filter circuit has a resistance of 5.1KΩ±5%, and the second capacitor (C2) has a capacitance of 100nF.

5. The apparatus as claimed in claim 1, characterized in that, The device further includes: The temperature detection circuit (200) includes an NTC thermistor (R3), which is connected in series with a fixed resistor (R4) to divide the voltage. The voltage divider node is grounded through a filter capacitor (C3) and then connected to the analog-to-digital conversion pin of the main control chip (U3).

6. The apparatus as claimed in claim 5, characterized in that, The NTC thermistor (R3) has a resistance of 5KΩ, the fixed resistor (R4) has a resistance of 1KΩ±1%, and the filter capacitor (C3) has a capacitance of 100nF.

7. The apparatus as claimed in claim 5, characterized in that, The other end of the fixed resistor (R4) is connected to the output of the linear regulator (U2).

8. The apparatus according to any one of claims 1 to 7, characterized in that, The device further includes: The wind pressure detection circuit (300) includes a voltage divider sensor (U4). The power supply terminal of the voltage divider sensor (U4) is controlled to be switched on or off by a logic chip (U5). The enable terminal (OE) of the logic chip (U5) is connected to the RB1 pin of the main control chip (U3) through a fifth resistor (R5).

9. The apparatus as claimed in claim 8, characterized in that, The logic chip (U5) is model AO3400.

10. The apparatus as claimed in claim 8, characterized in that, The voltage divider sensor (U4) is model MPXV7002DP. The input terminal of the voltage divider sensor (U4) is connected to the output terminal of the linear regulator (U2) through the sixth resistor (R6) and the seventh resistor (R7).

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