Current detection and control circuit of six-path UV lamp group power supply line

Abstract

The utility model provides a current detection and control circuit for a six-path UV lamp group power supply line, which comprises an MCU single chip microcomputer, a main path current detection circuit, A and B branch current detection circuits and a control and display circuit, and is characterized in that the main path current detection circuit comprises a current detection sensor, an enhanced isolation amplifier, a differential filter circuit, a first operational amplifier and a comparator; the A and B branch current detection circuit comprises a first linear current sensor and a second linear current sensor; the control and display circuit comprises a PWM pulse output circuit and a display unit, current detection of a main circuit and a branch circuit of the UV lamp set circuit can be carried out in real time, and meanwhile, PWM pulses can be sent in time to adjust current output of a constant current source, so that larger secondary damage caused by current fluctuation generated by short circuit or open circuit of a lamp set is prevented, and the service life of the lamp set is prolonged. And the problem can be found in time through the current value, and the damaged lamp group can be quickly found.

Description

Technical Field

[0001] The utility model relates to the technical field of UV lamp circuit detection, in particular to a circuit for detecting and controlling the current of a 6-way UV lamp group power supply line. Background Technique

[0002] At present, most of the current detections on the market are not accurate enough, with large numerical offsets and fluctuations, and are greatly affected by the devices themselves. The method of testing the circuit will also cause numerical fluctuations, making the detected values not meet the requirements in actual applications. Generally, the current detections on the market do not support multi-channel detections, which will lead to incomplete and inaccurate detections. Content of the Utility Model

[0003] The purpose of the utility model is to provide a circuit for detecting and controlling the current of a 6-way UV lamp group power supply line to solve the problems of large offset and fluctuation of the detected values and non-support for multi-channels.

[0004] The technical solution adopted by the above utility model is: a circuit for detecting and controlling the current of a 6-way UV lamp group power supply line, including an MCU single-chip microcomputer, a main circuit current detection circuit, A and B branch current detection circuits, and a control and display circuit. The main circuit current detection circuit includes a current detection sensor, an enhanced isolation amplifier, a differential filtering circuit, a first operational amplifier, and a comparator; the A and B branch current detection circuits include a first linear current sensor and a second linear current sensor; the control and display circuit includes a PWM pulse output circuit and a display unit; one end of the current detection sensor is fixed on one side of a plurality of UV lamp group curing devices, and the other end is connected to the input end of the enhanced isolation amplifier; the output end of the enhanced isolation amplifier is connected to the first end of the differential filtering circuit, the second end of the differential filtering circuit is connected to the input end of the first operational amplifier; one output path of the first operational amplifier is connected to the MCU single-chip microcomputer, and the other path is connected to the input end of the comparator; one ends of the first linear current sensor and the second linear current sensor are connected to the output end of the current detection sensor, and the other ends are connected to the MCU single-chip microcomputer.

[0005] Further, the two PWM pulse output circuits include a dual-channel gate driver, a second operational amplifier, and a third operational amplifier; one end of the dual-channel gate driver is connected to the output end of the MCU single-chip microcomputer, and the other end is divided into two paths and respectively connected to the input ends of the second operational amplifier and the third operational amplifier.

[0006] Further, the model of the MCU single-chip microcomputer is STM32F103RCT6, the linear current sensor is a chip with the model ACS712, the dual-channel gate driver is a chip with the model UCC21520ADW, and the model of the enhanced isolation amplifier is AMC1301; the model of the first operational amplifier is OPA320; the models of the second operational amplifier and the third operational amplifier are AD8606.

[0007] Further, the current detection sensor is a 5-milliohm shunt resistor, and a welding terminal is welded to one end of the shunt resistor; the model of the comparator is TLC372, and the comparator includes a first voltage comparator and a second voltage comparator both with the model TLC372.

[0008] Further, the first power supply terminal of the enhanced isolation amplifier is connected to a 3V power supply after being serially connected with a third resistor, the first power supply terminal of the enhanced isolation amplifier is also connected with a parallel voltage regulator, the first power supply terminal of the enhanced isolation amplifier is also paralleled with a first capacitor, the first power supply terminal of the enhanced isolation amplifier is also paralleled with a second capacitor, the non-inverting input terminal and the inverting input terminal of the enhanced isolation amplifier are connected to the current detection sensor, the first grounding terminal of the enhanced isolation amplifier is connected to the input terminals of the two A and B branch current detection circuits, the second grounding terminal of the enhanced isolation amplifier is grounded, the non-inverting output terminal and the inverting output terminal of the enhanced isolation amplifier are connected to the differential filtering circuit, the second power supply terminal of the enhanced isolation amplifier is connected to a 3V power supply, the second power supply terminal of the enhanced isolation amplifier is also paralleled with a third capacitor, the second power supply terminal of the enhanced isolation amplifier is also paralleled with a fourth capacitor, and the second power supply terminal of the enhanced isolation amplifier is also grounded.

[0009] Further, the filtering circuit is paralleled with an eighth resistor and connected to the inverting input terminal of the first operational amplifier, and the filtering circuit is paralleled with a ninth resistor and connected to the non-inverting input terminal of the first operational amplifier.

[0010] Further, a sixth capacitor and an eleventh resistor are also connected in parallel to the non-inverting input terminal of the first operational amplifier, the non-inverting input terminal of the first operational amplifier is also grounded, the inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier after being connected in parallel with an eighth capacitor, the inverting input terminal of the first operational amplifier is connected to the first end of a twelfth resistor, the second end of the twelfth resistor is connected to the first end of a thirteenth resistor, the second end of the thirteenth resistor is connected to the output terminal of the first operational amplifier, a 3V power supply is applied to the power supply terminal of the first operational amplifier, a ninth capacitor is also connected to the power supply terminal of the first operational amplifier, the power supply terminal of the first operational amplifier is also grounded, the ground terminal of the first operational amplifier is grounded, the output terminal of the first operational amplifier is connected to an MCU single-chip microcomputer through a fourteenth resistor, a tenth capacitor is also connected in parallel to the output terminal of the first operational amplifier, the output terminal of the first operational amplifier is also grounded, the output terminal of the first operational amplifier is connected to the inverting input terminal of a first voltage comparator through a series connection of a fifteenth resistor and a sixteenth resistor, the output terminal of the first operational amplifier is also connected to the non-inverting input terminal of a second voltage comparator through a series connection of a fifteenth resistor and a sixteenth resistor, and the ground terminal of the first operational amplifier is grounded.

[0011] Further, the non-inverting input terminal of the first voltage comparator is connected to the inverting input terminal of the second voltage comparator, an eighteenth resistor is connected in series between the non-inverting input terminal of the first voltage comparator and the inverting input terminal of the second voltage comparator, the non-inverting input terminal of the first voltage comparator is connected to a 3V power supply after being connected in series with a seventeenth resistor, an eleventh capacitor is also connected in parallel to the non-inverting input terminal of the first voltage comparator, the non-inverting input terminal of the first voltage comparator is also grounded, a 3V power supply is applied to the power supply terminal of the first voltage comparator, the power supply terminal of the first voltage comparator is also grounded after being connected in series with a twelfth capacitor, the ground terminal of the first voltage comparator is grounded, the output terminal of the first voltage comparator is connected to the output terminal of the second voltage comparator, a twentieth resistor and a twenty-first resistor are connected in series between the output terminal of the first voltage comparator and the output terminal of the second voltage comparator, and the output terminal of the first voltage comparator and the output terminal of the second voltage comparator are also connected in parallel with a twenty-second resistor and then connected to a 3V power supply.

[0012] Further, the input end of the first linear current sensor is connected to the first terminal, the grounding end of the first linear current sensor is grounded, the filtering end of the first linear current sensor is grounded after being serially connected with a fourteenth capacitor, the output end of the first linear current sensor is grounded after being serially connected with a twenty-fourth resistor, a twenty-second resistor is further serially connected between the output end of the first linear current sensor and the twenty-third resistor, the output end of the first linear current sensor is also serially connected with a twenty-third resistor and then connected to the anode of a first diode, the cathode of the first diode is serially connected with a fifteenth capacitor and then grounded, the power supply end of the first linear current sensor is connected to a 5V power supply, and the power supply end of the first linear current sensor is grounded after being shunted by a thirteenth capacitor; the input end of the second linear current sensor is connected to the second terminal, the grounding end of the second linear current sensor is grounded, the filtering end of the second linear current sensor is grounded after being serially connected with a seventeenth capacitor, the output end of the second linear current sensor is grounded after being serially connected with a twenty-sixth resistor, a twenty-fifth resistor is further serially connected between the output end of the second linear current sensor and the twenty-sixth resistor, the output end of the second linear current sensor is also serially connected with a twenty-fifth resistor and then connected to the anode of a second diode, the cathode of the second diode is serially connected with an eighteenth capacitor and then grounded, the power supply end of the second linear current sensor is connected to a 5V power supply, and the power supply end of the second linear current sensor is grounded after being shunted by a sixteenth capacitor.

[0013] Further, the positive input terminal of the second operational amplifier is grounded after being serially connected with a twenty-sixth resistor, and is also connected to the anode of the first rectifier diode after being serially connected with a twenty-seventh resistor. The positive input terminal of the second operational amplifier is also connected to the first output terminal of the dual-channel gate driver after being paralleled with a twenty-eighth resistor. The negative input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier, and a twenty-ninth resistor is serially connected between the negative input terminal and the output terminal of the second operational amplifier. The negative input terminal of the second operational amplifier is also grounded after being serially connected with a thirtieth resistor. The negative input terminal of the second operational amplifier is grounded. The power supply terminal of the second operational amplifier is connected to a 12V power supply, the ground terminal of the second operational amplifier is grounded, the output terminal of the second operational amplifier outputs data, and the output terminal of the second operational amplifier is also grounded after being paralleled with a first transient suppression diode. The positive input terminal of the third operational amplifier is grounded after being serially connected with a thirty-first resistor, and is also connected to the anode of the second rectifier diode after being serially connected with a thirty-second resistor. The positive input terminal of the third operational amplifier is also connected to the second output terminal of the dual-channel gate driver after being paralleled with a thirty-third resistor. The negative input terminal of the third operational amplifier is connected to the output terminal of the third operational amplifier, and a thirty-fourth resistor is serially connected between the negative input terminal and the output terminal of the third operational amplifier. The negative input terminal of the third operational amplifier is also grounded after being serially connected with a thirty-fifth resistor. The negative input terminal of the third operational amplifier is grounded. The power supply terminal of the third operational amplifier is connected to a 12V power supply, the ground terminal of the third operational amplifier is grounded, the output terminal of the third operational amplifier outputs data, and the output terminal of the third operational amplifier is grounded after being paralleled with a second transient suppression diode.

[0014] Compared with the prior art, the embodiment of the present utility model has at least the following advantages or beneficial effects:

[0015] The present utility model detects the main circuit current signal through a current sensor, transmits it to an enhanced isolation amplifier for enhancement, then filters it through a filter circuit, amplifies it through an operational amplifier, and then outputs one current value to an MCU single-chip microcomputer and the other to a TLC372 comparator for over-current protection. The AD output of the MCU can obtain an accurate current value through conversion; the branch circuit current signals are detected through two linear current sensors, output and sent to the AD port of an STM32F103RCT6 single-chip microcomputer for analog-to-digital conversion, and the linear relationship curve between the output voltage and current is obtained through an ACS712 chip to obtain an accurate current value.

[0016] This utility model uses the MCU single-chip microcomputer STM32F103RCT6 to collect the current of a 6-channel UV lamp group circuit. Each channel is further divided into two branches, namely branch A and branch B. Three current values are collected for each channel. The main circuit current value is used as a reference for adjusting the output of the constant current source by PWM pulses. The current values of the two branches, A and B, can reflect the differences in the UV lamp groups on branches A and B, and short circuits, open circuits and other faults can also be found according to the current values. In this way, multi-channel current detection is realized, and the current of the main circuit and branches of the UV lamp group circuit can be detected in real time. At the same time, PWM pulses can be sent in time to adjust the current output of the constant current source, so as to prevent greater secondary damage caused by current fluctuations caused by short circuits or open circuits in the lamp group. Problems can also be found in time through the current values, and the damaged lamp group can be quickly located. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the main circuit current detection circuit in the first embodiment of this utility model;

[0018] Figure 2 Schematic diagram of the branch A and branch B current detection circuits in the first embodiment of this utility model;

[0019] Figure 3 Schematic diagram of the PWM pulse output circuit in the first embodiment of this utility model;

[0020] Figure 4 Schematic diagram of the MCU single-chip microcomputer in the first embodiment of this utility model.

[0021] Figure 5 Schematic diagram of the display unit in the first embodiment of this utility model.

[0022] The following specific embodiments will further illustrate this utility model in conjunction with the above-mentioned drawings. SPECIFIC EMBODIMENTS

[0023] For the convenience of understanding this utility model, the following will describe this utility model more comprehensively with reference to the relevant drawings. Several embodiments of this utility model are given in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this utility model more thorough and comprehensive.

[0024] It should be noted that when an element is referred to as "fixedly installed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this utility model belongs. The terms used in the specification of this utility model herein are for the purpose of describing specific embodiments only and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0026] Refer to the appended Figure 1 to the appended Figure 5 , which is illustrated as a specific embodiment of a circuit for detecting and controlling the current of a 6-way UV lamp group power supply line provided by the utility model.

[0027] Refer to the appended Figure 1 , a circuit for detecting and controlling the current of a 6-way UV lamp group power supply line, including an MCU single-chip microcomputer, a main circuit current detection circuit, A and B branch current detection circuits, and a control and display circuit. The main circuit current detection circuit includes a current detection sensor, an enhanced isolation amplifier U41, a differential filtering circuit, a first operational amplifier U47, and a comparator; the A and B branch current detection circuits include a first linear current sensor U33 and a second linear current sensor U34; the control and display circuit includes a 2-way PWM pulse output circuit and a display unit; one end of the current detection sensor is fixed to one side of a plurality of UV lamp group curing devices, and the other end is connected to the input end of the enhanced isolation amplifier U41; the output end of the enhanced isolation amplifier U41 is connected to the first end of the differential filtering circuit, and the second end of the differential filtering circuit is connected to the input end of the first operational amplifier U47; one path of the output end of the first operational amplifier U47 is connected to the MCU single-chip microcomputer, and the other path is connected to the input end of the comparator; one end of the first linear current sensor U33 and the second linear current sensor U34 is connected to the output end of the current detection sensor, and the other end is connected to the MCU single-chip microcomputer.

[0028] Refer to the appended Figure 3 , in the above embodiment, the two-way PWM pulse output circuit includes a dual-channel gate driver U1, a second operational amplifier U18A, and a third operational amplifier U19A; one end of the dual-channel gate driver U1 is connected to the output end of the MCU single-chip microcomputer, and the other end is divided into two paths and respectively connected to the input ends of the second operational amplifier U18A and the third operational amplifier U19A. By comparing with the set threshold in the single-chip microcomputer, if it is too large or too small, the single-chip microcomputer will send out PWM pulses with different duty cycles to adjust the output of the constant current source, so that the output is accurate and stable.

[0029] Refer to the appended Figure 1 and the appended Figure 4, in the above embodiment, the model of the MCU single-chip microcomputer is STM32F103RCT6, the linear current sensor is a chip with the model ACS712, the dual-channel gate driver U1 is a chip with the model UCC21520ADW, and the model of the enhanced isolation amplifier U41 is AMC1301; the model of the first operational amplifier U47 is OPA320; the models of the second operational amplifier U18A and the third operational amplifier U19A are AD8606. By utilizing the high performance and rich peripheral interfaces of the single-chip microcomputer STM32F103RCT6, the circuit of this solution operates more quickly and efficiently.

[0030] Refer to the appendix Figure 1 , in the above embodiment, the current detection sensor is a 5-milliohm shunt resistor, and a welding terminal is welded to one end of the shunt resistor; the model of the comparator is TLC372, and the comparator includes a first voltage comparator U53A and a second voltage comparator U53B both with the model TLC372. By directly driving capacitive loads with the TLC372 comparator, a pull-up resistor is not required, thereby reducing power consumption, saving circuit board space and component costs.

[0031] Refer to the appendix Figure 1 , in the above embodiment, a third resistor R153 is connected in series to the first power supply terminal of the enhanced isolation amplifier U41 and then connected to a 3V power supply. The first power supply terminal of the enhanced isolation amplifier U41 is also connected to a parallel voltage regulator. A first capacitor C167 is also connected in parallel to the first power supply terminal of the enhanced isolation amplifier U41. A second capacitor C168 is also connected in parallel to the first power supply terminal of the enhanced isolation amplifier U41. The non-inverting input terminal and the inverting input terminal of the enhanced isolation amplifier U41 are connected to the current detection sensor. The first ground terminal of the enhanced isolation amplifier U41 is connected to the input terminals of the two A and B branch current detection circuits. The second ground terminal of the enhanced isolation amplifier U41 is grounded. The non-inverting output terminal and the inverting output terminal of the enhanced isolation amplifier U41 are connected to the differential filtering circuit. The second power supply terminal of the enhanced isolation amplifier U41 is connected to a 3V power supply. A third capacitor C169 is also connected in parallel to the second power supply terminal of the enhanced isolation amplifier U41. A fourth capacitor C170 is also connected in parallel to the second power supply terminal of the enhanced isolation amplifier U41. The second power supply terminal of the enhanced isolation amplifier U41 is also grounded. By providing precise current control through this enhanced isolation amplifier U41, the detection of current is made more accurate.

[0032] Refer to the appendix Figure 1, in the above embodiment, the filter circuit is connected in parallel with the eighth resistor R158 to the inverting input terminal of the first operational amplifier U47, and the filter circuit is connected in parallel with the ninth resistor R159 to the non-inverting input terminal of the first operational amplifier U47. By utilizing the characteristics of the filter circuit to suppress the common-mode signal and amplify the differential-mode signal, when the circuit of this solution faces interference signals, it can reduce the interference through the difference between the two input signals, thereby improving the ability of the circuit of this solution to resist common-mode interference.

[0033] Refer to the appendix Figure 1 , in the above embodiment, the non-inverting input terminal of the first operational amplifier U47 is also connected in parallel with the sixth capacitor C172 and the eleventh resistor R161. The non-inverting input terminal of the first operational amplifier U47 is also grounded. The inverting input terminal of the first operational amplifier U47 is connected in parallel with the eighth capacitor C174 and then connected to the output terminal of the first operational amplifier U47. The inverting input terminal of the first operational amplifier U47 is connected to the first terminal of the twelfth resistor R162. The second terminal of the twelfth resistor R162 is connected to the first terminal of the thirteenth resistor R153. The second terminal of the thirteenth resistor R153 is connected to the output terminal of the first operational amplifier U47. A 3V power supply is applied to the power supply terminal of the first operational amplifier U47. The power supply terminal of the first operational amplifier U47 is also connected to the ninth capacitor C175. The power supply terminal of the first operational amplifier U47 is also grounded. The grounding terminal of the first operational amplifier U47 is grounded. The output terminal of the first operational amplifier U47 is connected to the MCU single-chip microcomputer through the fourteenth resistor R164. The output terminal of the first operational amplifier U47 is also connected in parallel with the tenth capacitor C176. The output terminal of the first operational amplifier U47 is also grounded. The output terminal of the first operational amplifier U47 is connected to the inverting input terminal of the first voltage comparator U53A through the series connection of the fifteenth resistor R165 and the sixteenth resistor R166. The output terminal of the first operational amplifier U47 is also connected to the non-inverting input terminal of the second voltage comparator U53B through the series connection of the fifteenth resistor R165 and the sixteenth resistor R166. The grounding terminal of the first operational amplifier U47 is grounded. By utilizing the characteristics of low power consumption, low noise and excellent performance of the first operational amplifier U47, the circuit of this solution can operate with high performance and low noise directly powered by the battery without adjustment during operation.

[0034] Refer to the appendix Figure 1, in the above embodiment, the non-inverting input terminal of the first voltage comparator U53A is connected to the inverting input terminal of the second voltage comparator U53B. An eighteenth resistor R168 is connected in series between the non-inverting input terminal of the first voltage comparator U53A and the inverting input terminal of the second voltage comparator U53B. The non-inverting input terminal of the first voltage comparator U53A is connected to a 3V power supply after being connected in series with a seventeenth resistor R167. The non-inverting input terminal of the first voltage comparator U53A is also connected in parallel with an eleventh capacitor C177. The non-inverting input terminal of the first voltage comparator U53A is also grounded. The power supply terminal of the first voltage comparator U53A is connected to a 3V power supply. The power supply terminal of the first voltage comparator U53A is also connected to the ground after being connected in series with a twelfth capacitor C178. The ground terminal of the first voltage comparator U53A is grounded. The output terminal of the first voltage comparator U53A is connected to the output terminal of the second voltage comparator U53B. A twentieth resistor R170 and a twenty-first resistor R171 are connected in series between the output terminal of the first voltage comparator U53A and the output terminal of the second voltage comparator U53B. The output terminal of the first voltage comparator U53A and the output terminal of the second voltage comparator U53B are also connected in parallel with a twenty-second resistor R172 and then connected to a 3V power supply. The comparator provides a high input impedance and a low bias current, has an extremely stable input offset voltage and a large differential input voltage range, improves the accuracy of current detection, and at the same time, by using this design, the system cost can be reduced and a compact design can be supported.

[0035] Refer to the appendix Figure 2, in the above embodiment, the input end of the first linear current sensor U33 is connected to the first terminal, the grounding end of the first linear current sensor U33 is grounded, the filtering end of the first linear current sensor U33 is grounded after being connected in series with the fourteenth capacitor C148, the output end of the first linear current sensor U33 is grounded after being connected in series with the twenty-fourth resistor R140, a twenty-third resistor R139 is also connected in series between the output end of the first linear current sensor U33 and the twenty-fourth resistor R140, the output end of the first linear current sensor U33 is also connected to the anode of the first diode D51 after being connected in series with the twenty-third resistor R139, the cathode of the first diode D51 is grounded after being connected in series with the fifteenth capacitor C149, the power supply end of the first linear current sensor U33 is connected to a 5V power supply, and the power supply end of the first linear current sensor U33 is grounded after being connected in parallel with the thirteenth capacitor C147; the input end of the second linear current sensor U34 is connected to the second terminal, the grounding end of the second linear current sensor U34 is grounded, the filtering end of the second linear current sensor U34 is grounded after being connected in series with the seventeenth capacitor C151, the output end of the second linear current sensor U34 is grounded after being connected in series with the twenty-sixth resistor R142, a twenty-fifth resistor R141 is also connected in series between the output end of the second linear current sensor U34 and the twenty-sixth resistor R142, the output end of the second linear current sensor U34 is also connected to the anode of the second diode D52 after being connected in series with the twenty-fifth resistor R141, the cathode of the second diode D52 is grounded after being connected in series with the eighteenth capacitor C152, the power supply end of the second linear current sensor U34 is connected to a 5V power supply, and the power supply end of the second linear current sensor U34 is grounded after being connected in parallel with the sixteenth capacitor C150. By utilizing the characteristics of high precision and low cost of the ACS712 linear current sensor, the output noise is further reduced and the low-current accuracy is improved.

[0036] Refer to the appendix Figure 3, in the above embodiment, the non-inverting input terminal of the second operational amplifier U18A is grounded after being serially connected with the twenty-sixth resistor R66. The non-inverting input terminal of the second operational amplifier U18A is also serially connected with the twenty-seventh resistor R62 and then connected to the anode of the first rectifier diode D16. The non-inverting input terminal of the second operational amplifier U18A is also connected to the first output terminal of the dual-channel gate driver U1 after being paralleled with the twenty-eighth resistor R64. The inverting input terminal of the second operational amplifier U18A is connected to the output terminal of the second operational amplifier U18A. A twenty-ninth resistor R66a is also serially connected between the inverting input terminal and the output terminal of the second operational amplifier U18A. The inverting input terminal of the second operational amplifier U18A is also grounded after being serially connected with the thirtieth resistor R66a. The inverting input terminal of the second operational amplifier U18A is grounded. The power supply terminal of the second operational amplifier U18A is connected to a 12V power supply. The ground terminal of the second operational amplifier U18A is grounded. The output terminal of the second operational amplifier U18A outputs data. The output terminal of the second operational amplifier U18A is also grounded after being paralleled with the first transient suppression diode D18. The non-inverting input terminal of the third operational amplifier U19A is grounded after being serially connected with the thirty-first resistor R67. The non-inverting input terminal of the third operational amplifier U19A is also serially connected with the thirty-second resistor R63 and then connected to the anode of the second rectifier diode D17. The non-inverting input terminal of the third operational amplifier U19A is also connected to the second output terminal of the dual-channel gate driver U1 after being paralleled with the thirty-third resistor R65. The inverting input terminal of the third operational amplifier U19A is connected to the output terminal of the third operational amplifier U19A. A thirty-fourth resistor R67a is also serially connected between the inverting input terminal and the output terminal of the third operational amplifier U19A. The inverting input terminal of the third operational amplifier U19A is also grounded after being serially connected with the thirty-fifth resistor R67b. The inverting input terminal of the third operational amplifier U19A is grounded. The power supply terminal of the third operational amplifier U19A is connected to a 12V power supply. The ground terminal of the third operational amplifier U19A is grounded. The output terminal of the third operational amplifier U19A outputs data. The output terminal of the third operational amplifier U19A is grounded after being paralleled with the second transient suppression diode D19. The high output drive, high precision, and low noise performance provided by the AD8606 operational amplifier enable this solution to meet multi-channel outputs, improve the accuracy of current detection, and further reduce noise at the same time.

[0037] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. A circuit for current detection and control of 6-way UV lamp group power supply circuits, characterized in that: It includes an MCU single-chip computer, a main current detection circuit, A and B branch current detection circuits, and a control and display circuit. The main current detection circuit includes a current detection sensor, an enhanced isolation amplifier, a differential filter circuit, a first operational amplifier, and a comparator; the A and B branch current detection circuits include a first linear current sensor and a second linear current sensor; the control and display circuit includes a PWM pulse output circuit and a display unit; one end of the current detection sensor is fixed to one side of a plurality of UV lamp group curing devices, and the other end is connected to the input end of the enhanced isolation amplifier; The output end of the enhanced isolation amplifier is connected to the first end of the differential filter circuit, and the second end of the differential filter circuit is connected to the input end of the first operational amplifier; One output end of the first operational amplifier is connected to the MCU microcontroller, and the other output end is connected to the comparator input end; One end of the first linear current sensor and the second linear current sensor is connected to the output end of the current detection sensor, and the other end is connected to the MCU microcontroller.

2. According to claim 1, a circuit for current detection and control of a 6-way UV lamp group power supply line, characterized in that: The 2-way PWM pulse output circuit includes a dual-way gate driver, a second operational amplifier and a third operational amplifier; one end of the dual-way gate driver is connected to the output end of the MCU microcontroller, and the other end is divided into two ways and connected to the input ends of the second operational amplifier and the third operational amplifier respectively.

3. A circuit for current detection and control of a 6-way UV lamp group power supply line according to claim 2, characterized in that: The model of the MCU single-chip computer is STM32F103RCT6, the linear current sensor is an ACS712 chip, the dual-channel gate driver is an UCC21520ADW chip, the model of the enhanced isolation amplifier is AMC1301; the model of the first operational amplifier is OPA320; the models of the second operational amplifier and the third operational amplifier are AD8606.

4. A circuit for current detection and control of a 6-way UV lamp group power supply line according to claim 1, characterized in that: The current detection sensor is a 5 milliohm shunt, one end of which is welded with a welding terminal; the comparator model is TLC372, and the comparator includes a first voltage comparator and a second voltage comparator of model TLC372.

5. The circuit for current detection and control of a 6-way UV lamp group power supply line according to claim 1, characterized in that: The first power supply end of the enhanced isolation amplifier is connected in series with a third resistor and then connected to a 3V power supply. The first power supply end of the enhanced isolation amplifier is also connected to a parallel regulator. The first power supply end of the enhanced isolation amplifier is also connected in parallel with a first capacitor. The first power supply end of the enhanced isolation amplifier is also connected in parallel with a second capacitor. The positive input end and the reverse input end of the enhanced isolation amplifier are connected to a current detection sensor. The first ground end of the enhanced isolation amplifier is connected to the input ends of the two A and B branch current detection circuits. The second ground end of the enhanced isolation amplifier is grounded. The positive output end and the reverse output end of the enhanced isolation amplifier are connected to the differential filter circuit. The second power supply end of the enhanced isolation amplifier is connected to a 3V power supply. The second power supply end of the enhanced isolation amplifier is also connected in parallel with a third capacitor. The second power supply end of the enhanced isolation amplifier is also connected in parallel with a fourth capacitor. The second power supply end of the enhanced isolation amplifier is also grounded.

6. A circuit for current detection and control of 6-way UV lamp group power supply circuits according to claim 1, characterized in that: The filter circuit is connected in parallel with an eighth resistor and connected to the inverting input terminal of the first operational amplifier. The filter circuit is connected in parallel with a ninth resistor and connected to the non-inverting input terminal of the first operational amplifier.

7. The circuit for current detection and control of 6-way UV lamp group power supply circuits according to claim 4, characterized in that: The non-inverting input terminal of the first operational amplifier is also connected in parallel with the sixth capacitor and the eleventh resistor, the non-inverting input terminal of the first operational amplifier is also grounded, the inverting input terminal of the first operational amplifier is also connected in parallel with the eighth capacitor and then connected to the output terminal of the first operational amplifier, the inverting input terminal of the first operational amplifier is connected to the first end of the twelfth resistor, the second end of the twelfth resistor is connected to the first end of the thirteenth resistor, the second end of the thirteenth resistor is connected to the output terminal of the first operational amplifier, a 3V power supply is passed through the power supply terminal of the first operational amplifier, the power supply terminal of the first operational amplifier is also connected to the ninth capacitor, the power supply terminal of the first operational amplifier is also grounded, the grounding terminal of the first operational amplifier is grounded, the output terminal of the first operational amplifier is connected to the MCU microcontroller through the fourteenth resistor, the output terminal of the first operational amplifier is also connected in parallel with the tenth capacitor, the output terminal of the first operational amplifier is also grounded, the output terminal of the first operational amplifier is connected to the inverting input terminal of the first voltage comparator through the fifteenth resistor and the sixteenth resistor in series, and the output terminal of the first operational amplifier is also connected to the non-inverting input terminal of the second voltage comparator through the fifteenth resistor and the sixteenth resistor in series.

8. The circuit for current detection and control of 6-way UV lamp group power supply circuits according to claim 7, characterized in that: The positive phase input terminal of the first voltage comparator is connected to the negative phase input terminal of the second voltage comparator, an eighteenth resistor is connected in series between the positive phase input terminal of the first voltage comparator and the negative phase input terminal of the second voltage comparator, the positive phase input terminal of the first voltage comparator is connected in series with the seventeenth resistor and then connected to a 3V power supply, the positive phase input terminal of the first voltage comparator is also connected in parallel with the eleventh capacitor, the positive phase input terminal of the first voltage comparator is also grounded, the power supply terminal of the first voltage comparator is connected to a 3V power supply, the power supply terminal of the first voltage comparator is also connected in series with the twelfth capacitor and then grounded, the ground terminal of the first voltage comparator is grounded, the output terminal of the first voltage comparator is connected to the output terminal of the second voltage comparator, the twentieth resistor and the twenty-first resistor are connected in series between the output terminal of the first voltage comparator and the output terminal of the second voltage comparator, the output terminal of the first voltage comparator and the output terminal of the second voltage comparator are also connected in parallel with the twenty-second resistor and then connected to a 3V power supply.

9. The circuit for current detection and control of a 6-way UV lamp group power supply circuit according to claim 1, characterized in that: The input end of the first linear current sensor is connected to the first terminal, the ground end of the first linear current sensor is grounded, the filter end of the first linear current sensor is connected in series with a fourteenth capacitor and then grounded, the output end of the first linear current sensor is connected in series with a twenty-fourth resistor and then grounded, the output end of the first linear current sensor is also connected in series with a twenty-third resistor and then connected to the anode of the first diode, a twenty-second resistor is also connected in series between the output end of the first linear current sensor and the twenty-third resistor, the cathode of the first diode is connected in series with a fifteenth capacitor and then grounded, the power supply end of the first linear current sensor is connected to a 5V power supply, and the power supply end of the first linear current sensor is connected in parallel with the thirteenth capacitor and then grounded; The input end of the second linear current sensor is connected to the second terminal, the ground end of the second linear current sensor is grounded, the filter end of the second linear current sensor is connected in series with the seventeenth capacitor and then grounded, the output end of the second linear current sensor is connected in series with the twenty-sixth resistor and then grounded, a twenty-fifth resistor is also connected in series between the output end of the second linear current sensor and the twenty-sixth resistor, the output end of the second linear current sensor is also connected in series with the twenty-fifth resistor and then connected to the anode of the second diode, the cathode of the second diode is connected in series with the eighteenth capacitor and then grounded, the power supply end of the second linear current sensor is connected to a 5V power supply, and the power supply end of the second linear current sensor is connected in parallel with the sixteenth capacitor and then grounded.

10. The circuit for current detection and control of 6-way UV lamp group power supply circuits according to claim 2, characterized in that: The non-inverting input terminal of the second operational amplifier is connected in series with a twenty-sixth resistor and then grounded, the non-inverting input terminal of the second operational amplifier is also connected in series with a twenty-seventh resistor and then connected to the anode of the first rectifier diode, the non-inverting input terminal of the second operational amplifier is also connected in parallel with a twenty-eighth resistor and then connected to the first output terminal of the dual-path gate driver, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier, a twenty-ninth resistor is also connected in series between the inverting input terminal of the second operational amplifier and the output terminal of the second operational amplifier, the inverting input terminal of the second operational amplifier is also connected in series with a thirtieth resistor and then grounded, the inverting input terminal of the second operational amplifier is grounded, the power supply terminal of the second operational amplifier is connected to a 12V power supply, the ground terminal of the second operational amplifier is grounded, the output terminal of the second operational amplifier outputs data, and the output terminal of the second operational amplifier is also connected in parallel with the first transient suppression diode and then grounded; The non-inverting input terminal of the third operational amplifier is connected in series with a thirty-first resistor and then grounded. The non-inverting input terminal of the third operational amplifier is also connected in series with a thirty-second resistor and then connected to the anode of the second rectifier diode. The non-inverting input terminal of the third operational amplifier is also connected in parallel with a thirty-third resistor and then connected to the second output terminal of the dual-path gate driver. The inverting input terminal of the third operational amplifier is connected to the output terminal of the third operational amplifier. A thirty-fourth resistor is also connected in series between the inverting input terminal of the third operational amplifier and the output terminal of the third operational amplifier. The inverting input terminal of the third operational amplifier is also connected in series with a thirty-fifth resistor and then grounded. The inverting input terminal of the third operational amplifier is grounded. The power supply terminal of the third operational amplifier is connected to a 12V power supply. The ground terminal of the third operational amplifier is grounded. The output terminal of the third operational amplifier outputs data. The output terminal of the third operational amplifier is connected in parallel with a second transient suppression diode and then grounded.

Images