Fluorescent lamp circuit detection device

Abstract

The utility model relates to a fluorescent lamp circuit detection device, and belongs to the technical field of electronics. The circuit comprises a fluorescent lamp equivalent circuit, a first double-limit voltage comparison circuit, an RS trigger, a photoelectric coupler, a second double-limit voltage comparison circuit, an IRL current detection circuit, a first operational amplifier comparison circuit, an IC current detection circuit, a second operational amplifier comparison circuit, a 12V-to-5V circuit, relays KM1, KM2, KM3 and KM4, a time relay KT, a NOR gate G1, and light emitting diodes LED1, LED2, LDE3 and LED4. According to the utility model, whether a fluorescent lamp experiment circuit built by students is correct is detected, repeated work of teachers in an experiment classroom is avoided, the autonomous learning ability of the students is improved, the teachers and the students can go deep into more operations and knowledge discussion from simple circuit inspection, the experiment teaching efficiency is improved, and the teaching target is clarified.

Description

TECHNICAL FIELD

[0001] The utility model relates to a fluorescent lamp circuit detection device belongs to electronic technical field. TECHNICAL BACKGROUND

[0002] Fluorescent lamp circuit experiment is an important basic experiment for students of colleges and universities to learn circuit theory course or electrician course. In the experimental course, the experimental teachers mostly spend time to respond to the needs of students, such as: judging the correctness of the equivalent resistance and load current set in the equivalent circuit of students, so as to carry out the next step of experimental operation. The low efficiency of teaching and learning affects the learning progress and is not conducive to the improvement of teaching quality. SUMMARY

[0003] The utility model solves the technical problem that the utility model provides a fluorescent lamp circuit detection device, and students complete fluorescent lamp circuit experiment by using the device, which can automatically help students judge whether the equivalent resistance and load current value in the fluorescent lamp experimental circuit are correct. Promote the ability of self-learning and error correction of students and improve the operation level of students.

[0004] The utility model technical scheme is: a fluorescent lamp circuit detection device, including fluorescent lamp equivalent circuit 1, first double limit voltage comparison circuit 2, RS trigger 3, photoelectric coupler 4, second double limit voltage comparison circuit 5, 12V turns 5V circuit 6, IRL current detection circuit 7, IC current detection circuit 8, operational amplifier comparison circuit one 9, operational amplifier comparison circuit two 10;

[0005] The fluorescent lamp equivalent circuit 1 is used as fluorescent lamp equivalent input and is connected to the first double limit voltage comparison circuit 2, IRL current detection circuit 7 and IC current detection circuit 8, and the output of the first double limit voltage comparison circuit 2 is used to control the RS trigger 3, the RS trigger 3 controls the relay KM1 through the photoelectric coupler 4 and drives the light emitting diode LED1;The RS trigger 3 and the second double limit voltage comparison circuit 5 are connected with or gate G1, which is used to control the state of the relay KM2 and LED2;The output of the IRL current detection circuit 7 connected with the operational amplifier comparison circuit one 9 is used to control the relay KM3 and LED3, and the output of the IC current detection circuit 8 connected with the operational amplifier comparison circuit two 10 is used to control the relay KM4 and LED4;The 12V turns 5V circuit 6 is used for power supply.

[0006] As a further scheme of the utility model, the fluorescent lamp equivalent circuit 1 includes line voltage L end, safety tube FU, power switch K, relay KM1 conversion contact KM1-1, equivalent resistance RBC, relay KM1 conversion contact KM1-2, relay KM2 conversion contact KM2-1, equivalent resistance RDE, relay KM2 conversion contact KM2-2, the IP+ end of IRL current detection circuit ACS712, IP- end, relay KM3 conversion contact KM3-1, phase voltage N end, relay KM3 conversion contact KM3-2, the IP+ end of IC current detection circuit ACS712, IP- end, relay KM4 conversion contact;

[0007] Line voltage L end connects safety tube FU, and the other end of safety tube FU connects the common end of power switch K, and the normally open contact of power switch K connects the normally open contact of relay KM1-1, and the common end of KM1-1 connects the one end of resistance RBC, and the other end of resistance RBC connects the common end of relay KM1-2, and the normally open contact of KM1-2 connects the normally open contact of relay KM2-1, and the common end of relay KM2-1 connects the one end of resistance RDE, and the other end of RDE connects the common end of relay KM2-2, and the normally open contact of KM2-2 connects the IP+ end of IRL current detection circuit ACS712, and its IP- end connects the common end of relay KM3-1, and the normally open contact of KM3-1 connects phase voltage N;One end of capacitor C8 connects the normally open contact of power switch K, and the other end connects the common end of relay KM3-2, and the normally open contact of KM3-2 connects the IP+ end of IC current detection circuit 8 of ACS712, and its IP- end connects the common end of relay KM4, and its normally open contact connects phase voltage N end.

[0008] As a further scheme of the utility model, the first double-limit voltage comparison circuit 2 includes integrated operational amplifier A1, A2, diode D1, D2;The same phase end of integrated operational amplifier A1 is connected with the opposite phase end of integrated operational amplifier A2, and is as the input end of the first double-limit voltage comparison circuit 2;The opposite phase end of integrated operational amplifier A1 is connected with the same phase end of integrated operational amplifier A2 with the middle end of potentiometer R3, R2 respectively;The one end of potentiometer R2, R3 is connected after being connected with each other with resistance R1 12V DC voltage source, and the other end is connected after being connected with each other with ground;The output end of integrated operational amplifier A1, A2 is connected with the anode of diode D1, D2 respectively, and the cathode of diode D1, D2 is connected after being connected, and is as the output end of the first double-limit voltage comparison circuit 2.

[0009] As a further scheme of the utility model, the normally closed contact of relay KM1 conversion contact KM1-1 is connected with 12V DC voltage source through resistance R4;The normally closed contact of KM2-1 is connected with the connection point UT1 of resistance R4 and is connected at the input end of the first double-limit voltage comparison circuit 2;The common end of KM1-2 is connected to the one end of RBC, and the other end is connected to the common end of relay KM2-1, and its normally closed contact is grounded;

[0010] The normally closed contact of the relay KM2 conversion contact KM2-1 is connected with a 12V DC voltage source through a resistor R15; the connection point UT2 of the normally closed contact of KM2-1 and the resistor R15 is connected to the input end of the second double-limit voltage comparison circuit 5; the common end of KM2-1 is connected to one end of RDE, and the other end is connected to the common end of the relay KM2-2, the normally closed contact of the relay KM2-2 is connected to a resistor R16, and the other end of R16 is connected to the ground.

[0011] As a further scheme of the utility model, the 12V DC voltage source is connected to the ground in series with the resistor R5 and the time relay KT coil; the S end of the RS flip-flop 3 is connected to the ground through the delay contact KT;

[0012] The Q end of the RS flip-flop 3 is connected to the anode of the diode D6 of the photoelectric coupler 4 through the resistor R9, and the cathode of the diode D6 is connected to the ground; the collector end of the triode T1 of the photoelectric coupler 4 is connected with the resistor R10 and one end of the resistor R13; the emitter of the triode T1 is connected to the ground; the other end of the resistor R10 is connected with the 12V DC voltage source; the other end of the resistor R13 is connected with the base of the triode T2; the 12V DC voltage source is connected with the collector of the triode T2 through the resistor R11 and the relay KM1 coil; the 12V DC voltage source is connected with the anode of the light emitting diode LED1 through the resistor R12, and the cathode of the light emitting diode LED1 is connected with the collector of the triode T2; the emitter of the triode T2 is connected to the ground.

[0013] As a further scheme of the utility model, the second double-limit voltage comparison circuit 5 includes integrated operational amplifier A3, A4, diode D3, D4; the non-inverting end of the integrated operational amplifier A3 is connected with the inverting end of the integrated operational amplifier A4, and serves as the input end of the second double-limit voltage comparison circuit 5; the inverting end of the integrated operational amplifier A3 and the non-inverting end of the integrated operational amplifier A4 are respectively connected with the middle ends of the potentiometer R8 and R7; one end of the potentiometer R7 and R8 is connected with each other and then connected with the 12V DC voltage source through the resistor R6, and the other end is connected with each other and then connected to the ground; the output ends of the integrated operational amplifier A3 and A4 are respectively connected with the anodes of the diodes D3 and D4, and the cathodes of the diodes D3 and D4 are connected with each other and then serve as the output end of the second double-limit voltage comparison circuit 5;

[0014] The normally closed contact of the relay KM2 conversion contact KM2-1 is connected with the input end of the second double-limit voltage comparison circuit 5; the output end of the second double-limit voltage comparison circuit 5 and the Q end of the RS flip-flop 3 are respectively connected with the two input ends of the NOR gate G1; the output end of the NOR gate G1 is connected with the anode of the light emitting diode LED2 through the resistor R14; the cathode of the light emitting diode LED2 is connected to the ground through the relay KM2 coil;

[0015] The common open contact of the relay KM2 conversion contact KM2-2 is connected to the IP+ of the ACS712 of the IRL current detection circuit 7, and the IP- thereof is connected to the common end of the conversion contact of the relay KM3, the normally closed contact of KM3-1 is connected to the phase voltage N end, and the normally open contact of KM3-1 is connected to the phase voltage N end of the fluorescent lamp equivalent circuit 1.

[0016] As a further scheme of the utility model, the 12V to 5V circuit 6 includes LP2980AIM5-5 low dropout linear regulator, capacitor C1, C2, C3;The capacitor C1 is used for filtering the input 12V power supply;The LP2980AIM5-5 low dropout linear regulator is used for converting the input 12V voltage to 5V output, and the V1N pin is connected to 12V input voltage, the GND pin is grounded, and the VOUT pin outputs stable 5V voltage;Capacitors C2, C3 are connected between the VOUT pin and ground respectively to ensure stable 5V output.

[0017] As a further scheme of the utility model, the IRL current detection circuit 7 includes a current sensor module ACS712, and an operational amplifier comparison circuit one 9 includes an operational amplifier A6, capacitors C4, C5, resistors R17, R18, a light emitting diode LED3 and a relay KM3;

[0018] The VIOUT end of the ACS712 of the IRL current detection circuit 7 is connected to the inverting input end of the operational amplifier comparison circuit one 9, the VCC of the ACS712 is connected to the 5V power supply, the FILTER end is connected to one end of the capacitor C4, the other end of the C4 is grounded, and the GND end is grounded;The 5V power supply end is grounded through the capacitor C5;

[0019] The noninverting input end of the operational amplifier comparison circuit one 9 is connected to the middle end of the potentiometer R18, one end of the R18 is connected to the 5V power supply, and the other end is grounded;The inverting input end is connected to the VIOUT end of the ACS712;The output end of the operational amplifier comparison circuit one 9 is connected to one end of the resistor R17, the other end of the R17 is connected to the anode of the light emitting diode LED3, the cathode thereof is connected to the control end of the relay KM3, and the other end of the KM3 is grounded;The 4, 1, 5 pins of the operational amplifier comparison circuit one 9 are grounded, and the 7 pin is connected to the 5V power supply.

[0020] As a further scheme of the utility model, the IC current detection circuit 8 includes a current sensor module ACS712, and an operational amplifier comparison circuit two 10 includes an operational amplifier A5, capacitors C6, C7, resistors R19, R20, a light emitting diode LED4 and a relay KM4;

[0021] Filter capacitor C8 is connected to the power switch K and the changeover contact KM1-1 of the relay KM1, the other end of C8 is connected to the IP+ of the ACS712 of the IC current detection circuit 8 through the changeover contact KM3-2 of the relay KM3-2, the IP- end of the ACS712 is connected to the common end of the changeover contact of the relay KM4, the normally closed contact of KM4 is connected to the phase voltage N end, and the normally open contact of KM4 is connected to the phase voltage N end of the fluorescent lamp equivalent circuit 1;

[0022] The VIOUT end of the ACS712 of the IC current detection circuit 8 is connected to the inverting input end of the operational amplifier comparison circuit two 10, the VCC of the ACS712 is connected to a 5V power supply, the FILTER end is connected to one end of a capacitor C6, the other end of C6 is connected to the ground, and the GND end is connected to the ground; the 5V power supply end is connected to the ground through a capacitor C7;

[0023] The non-inverting input end of the operational amplifier comparison circuit two 10 is connected to the middle end of a potentiometer R20, one end of R20 is connected to a 5V power supply, and the other end is connected to the ground; the inverting input end is connected to the VIOUT end of the ACS712; the output end of the operational amplifier comparison circuit two 10 is connected to one end of a resistor R19, the other end of R19 is connected to the anode of a light-emitting diode LED4, the cathode of LED4 is connected to the control end of a relay KM4, the other end of KM4 is connected to the ground; the 4, 1, 5 pins of the operational amplifier comparison circuit two 10 are connected to the ground, and the 7 pin is connected to a 5V power supply.

[0024] The beneficial effects of the utility model are that students can complete the fluorescent lamp equivalent circuit experiment by using the device, and can automatically help students judge whether the equivalent resistance and branch current value in the fluorescent lamp equivalent circuit are correct. The device promotes the self-learning and error correction ability of students, and improves the operation level of students;

[0025] The utility model automatically detects whether the fluorescent lamp equivalent circuit built by students is correct, avoids the repeated labor of teachers in the experiment class, improves the self-learning ability of students, enables the teachers and students to further discuss more operations and knowledge from simple circuit checking, improves the experiment teaching efficiency, and clearly defines the teaching target. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the circuit principle block diagram of the utility model;

[0027] Figure 2 It is part of the circuit principle of the utility model Figure One ;

[0028] Figure 3 It is part of the circuit principle of the utility model Figure Two ;

[0029] Figure 4 It is the fluorescent lamp equivalent circuit principle diagram;

[0030] Figure 5 This is the schematic diagram of the first dual-limit voltage comparator circuit;

[0031] Figure 6 This is the schematic diagram of the second dual-limit voltage comparator circuit;

[0032] Figure 7 This is the schematic diagram of an RS flip-flop;

[0033] Figure 8 This is a schematic diagram of a 12V to 5V circuit.

[0034] Figure 9 This is the schematic diagram of an IC current detection circuit;

[0035] Figure 10 This is a schematic diagram of an operational amplifier comparator circuit.

[0036] Figure 1 The following are the circuit labels: 1-Fluorescent lamp equivalent circuit, 2-First dual-limit voltage comparator circuit, 3-RS trigger, 4-Optocoupler, 5-Second dual-limit voltage comparator circuit, 6-12V to 5V circuit, 7-IRL current detection circuit, 8-IC current detection circuit, 9-Operational amplifier comparator circuit one, 10-Operational amplifier comparator circuit two, R1~R19-Resistors, D1~D4-Diodes, LED1~LED4-Light emitting diodes, T1~T2-Transistors, G1-NOR gate, KM1~KM4-Relays, KT-Time relay, G1-NOR gate. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clearly assist in illustrating the embodiments of the present invention.

[0038] Example 1: As Figures 1-10 As shown, a fluorescent lamp circuit detection device includes a fluorescent lamp equivalent circuit 1, a first dual-limit voltage comparison circuit 2, an RS trigger 3, an optocoupler 4, a second dual-limit voltage comparison circuit 5, a 12V to 5V circuit 6, an IRL current detection circuit 7, an IC current detection circuit 8, an operational amplifier comparison circuit one 9, and an operational amplifier comparison circuit two 10.

[0039] The fluorescent lamp equivalent circuit 1 is connected to the first double limit voltage comparison circuit 2, the IRL current detection circuit 7 and the IC current detection circuit 8 as a fluorescent lamp equivalent input, the output of the first double limit voltage comparison circuit 2 is used for controlling the RS flip-flop 3, the RS flip-flop 3 controls the relay KM1 through the photoelectric coupler 4 and drives the light emitting diode LED1; the RS flip-flop 3 and the second double limit voltage comparison circuit 5 are connected with the or gate G1 for controlling the state of the relay KM2 and LED2; the output of the IRL current detection circuit 7 connected with the operational amplifier comparison circuit one 9 is used for controlling the relay KM3 and LED3, the output of the IC current detection circuit 8 connected with the operational amplifier comparison circuit two 10 is used for controlling the relay KM4 and LED4; the 12V to 5V circuit 6 is used for power supply.

[0040] As a further scheme of the utility model, the fluorescent lamp equivalent circuit 1 includes line voltage L end, safety tube FU, power switch K, relay KM1 conversion contact KM1-1, equivalent resistance RBC, relay KM1 conversion contact KM1-2, relay KM2 conversion contact KM2-1, equivalent resistance RDE, relay KM2 conversion contact KM2-2, IP+ end of IRL current detection circuit ACS712, IP- end, relay KM3 conversion contact KM3-1, phase voltage N end, relay KM3 conversion contact KM3-2, IP+ end of IC current detection circuit ACS712, IP- end, relay KM4 conversion contact;

[0041] Line voltage L end connects safety tube FU, the other end of safety tube FU connects the common end of power switch K, the normally open contact of power switch K connects the normally open contact of relay KM1-1, the common end of KM1-1 connects one end of resistance RBC, the other end of resistance RBC connects the common end of relay KM1-2, the normally open contact of KM1-2 connects the normally open contact of relay KM2-1, the common end of relay KM2-1 connects one end of resistance RDE, the other end of RDE connects the common end of relay KM2-2, the normally open contact of KM2-2 connects the IP+ end of IRL current detection circuit ACS712, the IP- end thereof connects the common end of relay KM3-1, the normally open contact of KM3-1 connects phase voltage N; one end of capacitor C8 connects the normally open contact of power switch K, the other end thereof connects the common end of relay KM3-2, the normally open contact of KM3-2 connects the IP+ end of IC current detection circuit 8 ACS712, the IP- end thereof connects the common end of relay KM4, and the normally open contact thereof connects phase voltage N end.

[0042] As a further scheme of the utility model, the first double limit voltage comparison circuit 2 includes integrated operational amplifier A1, A2, diode D1, D2; the same phase terminal of integrated operational amplifier A1 is connected with the opposite phase terminal of integrated operational amplifier A2, and serves as the input terminal of the first double limit voltage comparison circuit 2; the opposite phase terminal of integrated operational amplifier A1 and the same phase terminal of integrated operational amplifier A2 are connected with the middle terminal of potentiometer R3, R2 respectively; one end of potentiometer R2, R3 is connected with 12V DC voltage source through resistance R1 after being connected with each other, and the other end is grounded after being connected with each other; the output terminal of integrated operational amplifier A1, A2 is connected with the anode of diode D1, D2 respectively, and the cathode of diode D1, D2 is connected after being connected, and serves as the output terminal of the first double limit voltage comparison circuit 2.

[0043] As a further scheme of the utility model, the normally closed contact of relay KM1 conversion contact KM1-1 is connected with 12V DC voltage source through resistance R4; the normally closed contact of KM2-1 is connected with the connecting point UT1 of resistance R4 and is connected with the input terminal of the first double limit voltage comparison circuit 2; the common terminal of KM1-2 is connected to one end of RBC, and the other end is connected to the common terminal of relay KM2-1, and the normally closed contact is grounded;

[0044] The normally closed contact of relay KM2 conversion contact KM2-1 is connected with 12V DC voltage source through resistance R15; the normally closed contact of KM2-1 is connected with the connecting point UT2 of resistance R15 and is connected with the input terminal of the second double limit voltage comparison circuit 5; the common terminal of KM2-1 is connected to one end of RDE, and the other end is connected to the common terminal of relay KM2-2, and the normally closed contact of relay KM2-2 is connected to resistance R16, and the other end of R16 is grounded.

[0045] As a further scheme of the utility model, 12V DC voltage source is connected with resistance R5 and time relay KT coil in series and is grounded; the S terminal of RS trigger 3 is connected with ground through delay contact KT;

[0046] The Q terminal of RS trigger 3 is connected with the anode of diode D6 of photoelectric coupler 4 through resistance R9, and the cathode of diode D6 is grounded; the collector terminal of triode T1 of photoelectric coupler 4 is connected with one end of resistance R10, R13; the emitter of triode T1 is grounded; the other end of resistance R10 is connected with 12V DC voltage source; the other end of resistance R13 is connected with the base of triode T2; 12V DC voltage source is connected with the collector of triode T2 through resistance R11 and relay KM1 coil; 12V DC voltage source is connected with the anode of light emitting diode LED1 through resistance R12, and the cathode of light emitting diode LED1 is connected with the collector of triode T2; the emitter of triode T2 is grounded.

[0047] As a further scheme of the utility model, the second double limit voltage comparison circuit 5 includes integrated operational amplifier A3, A4, diode D3, D4, the integrated operational amplifier A3 same phase end is connected with the integrated operational amplifier A4 opposite phase end, as the input end of second double limit voltage comparison circuit 5, the integrated operational amplifier A3 opposite phase end and the integrated operational amplifier A4 same phase end are connected with the intermediate terminal of potentiometer R8, R7 respectively, the one end of potentiometer R7, R8 is connected after each other through resistance R6 and connects 12V direct current voltage source, the other end is connected after each other and ground, the integrated operational amplifier A3, A4 output end is connected with diode D3, D4 anode respectively, diode D3, D4 cathode is connected after as the output end of second double limit voltage comparison circuit 5,

[0048] The normally closed contact of the relay KM2 conversion contact KM2-1 is connected with the input end of the second double limit voltage comparison circuit 5, and the output end of the second double limit voltage comparison circuit 5 is connected with the Q end of the RS trigger 3 or the two input ends of the NOR gate G1 respectively.

[0049] The normally open contact of the relay KM2 conversion contact KM2-2 is connected to the IP+ of the ACS712 of the IRL current detection circuit 7, the IP- end thereof is connected to the common end of the conversion contact of the relay KM3, the normally closed contact of KM3-1 is connected to the phase voltage N end, and the normally open contact of KM3-1 is connected to the phase voltage N end of the fluorescent lamp equivalent circuit 1.

[0050] As a further scheme of the utility model, the 12V to 5V circuit 6 includes LP2980AIM5-5 low dropout linear regulator, capacitors C1, C2 and C3, the capacitor C1 is used for filtering the input 12V power supply, the LP2980AIM5-5 low dropout linear regulator is used for converting the input 12V voltage to 5V output, the V1N pin is connected with the 12V input voltage, the GND pin is grounded, and the VOUT pin outputs stable 5V voltage, the capacitors C2 and C3 are connected between the VOUT pin and the ground respectively to ensure the stable 5V output.

[0051] As a further scheme of the utility model, the IRL current detection circuit 7 includes a current sensor module ACS712, and the operational amplifier comparison circuit one 9 includes an operational amplifier A6, capacitors C4 and C5, resistors R17 and R18, a light emitting diode LED3 and a relay KM3.

[0052] The VIOUT end of the ACS712 of the IRL current detection circuit 7 is connected to the inverting input end of the operational amplifier comparison circuit 9, the VCC of the ACS712 is connected to the 5V power supply, the FILTER end is connected to one end of the capacitor C4, the other end of the capacitor C4 is grounded, and the GND end is grounded; the 5V power supply end is grounded through the capacitor C5;

[0053] The non-inverting input end of the operational amplifier comparison circuit 9 is connected to the middle end of the potentiometer R18, one end of the potentiometer R18 is connected to the 5V power supply, and the other end is grounded; the inverting input end is connected to the VIOUT end of the ACS712; the output end of the operational amplifier comparison circuit 9 is connected to one end of the resistor R17, the other end of the resistor R17 is connected to the anode of the light-emitting diode LED3, the cathode of the light-emitting diode LED3 is connected to the control end of the relay KM3, the other end of the relay KM3 is grounded; the 4, 1 and 5 pins of the operational amplifier comparison circuit 9 are grounded, and the 7 pin is connected to the 5V power supply.

[0054] As a further scheme of the utility model, the IC current detection circuit 8 includes a current sensor module ACS712, and the operational amplifier comparison circuit two 10 includes an operational amplifier A5, capacitors C6 and C7, resistors R19 and R20, a light-emitting diode LED4 and a relay KM4.

[0055] The filter capacitor C8 is connected to the conversion contact KM1-1 common contact of the power switch K and the relay KM1, the other end of the capacitor C8 is connected to the IP+ of the ACS712 of the IC current detection circuit 8 through the common contact of the relay KM3-2, the IP- end is connected to the common end of the conversion contact of the relay KM4, the normally closed contact of the relay KM4 is connected to the phase voltage N end, and the normally open contact of the relay KM4 is connected to the phase voltage N end of the fluorescent lamp equivalent circuit 1.

[0056] The VIOUT end of the ACS712 of the IC current detection circuit 8 is connected to the inverting input end of the operational amplifier comparison circuit two 10, the VCC of the ACS712 is connected to the 5V power supply, the FILTER end is connected to one end of the capacitor C6, the other end of the capacitor C6 is grounded, and the GND end is grounded; the 5V power supply end is grounded through the capacitor C7.

[0057] The non-inverting input end of the operational amplifier comparison circuit two 10 is connected to the middle end of the potentiometer R20, one end of the potentiometer R20 is connected to the 5V power supply, and the other end is grounded; the inverting input end is connected to the VIOUT end of the ACS712; the output end of the operational amplifier comparison circuit two 10 is connected to one end of the resistor R19, the other end of the resistor R19 is connected to the anode of the light-emitting diode LED4, the cathode of the light-emitting diode LED4 is connected to the control end of the relay KM4, and the other end of the relay KM4 is grounded; the 4, 1 and 5 pins of the operational amplifier comparison circuit two 10 are grounded, and the 7 pin is connected to the 5V power supply.

[0058] The working principle of the utility model is: firstly, the resistance value of the equivalent resistance RBC in the equivalent circuit 1 of the fluorescent lamp is converted into a voltage signal, and is input to the first double-limit voltage comparison circuit 2 to determine whether it meets the preset requirement; then the determination state is kept at the Q end through the RS flip-flop 3; meanwhile, the working state of the photoelectric coupler 4 is controlled, the relay KM1 contact point action and the light-emitting diode LED1 lighting or extinguishing are controlled, so as to determine and prompt whether the resistance value selection of the equivalent resistance RBC is correct; secondly, the voltage signal value converted by the equivalent resistance RDE is output through the second double-limit voltage comparison circuit 5 to determine whether the resistance value of RDE is correct; whether the above two conditions are met at the same time is determined by the NOR gate G1, if the conditions are met, the coil KM2 is electrified, the contact point opening and closing of KM2 connects the IRL current detection circuit 7-ACS712 (Hall effect current sensor) to the circuit, and the light-emitting diode LED2 is lighted at the same time; thirdly, when the current of the IRL current detection circuit 7-ACS712 flows through the copper foil in the chip, a magnetic field is generated, the Hall element induces a linear voltage signal according to the magnetic field, and after the internal amplification, filtering, chopping and correction circuit, a voltage signal is output, the output signal directly reflects the size of the current flowing through the copper foil. The output voltage signal is sent to the inverting terminal of the operational amplifier comparison circuit one 9, if it meets the preset value, the output high level of the operational amplifier, otherwise it is switched to the low level state as low level. When the output high level is lighted, the LED3 indicator light is lighted at the same time, the relay KM3 contact point action is controlled, the circuit is connected to the N end, and the capacitor C and the IC current detection circuit 8-ACS712 of the other branch are connected to the circuit at the same time; fourthly, according to the same principle, if the current flowing through the IC current detection circuit 8-ACS712 (Hall effect current sensor) meets the preset value, the output high level of the operational amplifier comparison circuit two 10 is lighted, the LED4 indicator light is lighted at the same time, and the relay KM4 contact point action is controlled, the capacitor C is connected to the N end through the ACS712; thus, the four relay contacts of the fluorescent lamp circuit are all automatically connected, and normal experiment can be carried out.

[0059] The utility model initial state is as follows: after being electrified, the light-emitting diode LED1, LED2, LED3, LED4 are in the extinguishing state; the relay KM1, KM2, KM3, KM4 coil is not electrified, and the conversion contact KM1-1, KM1-2, KM2-1, KM2-2, KM3-1, KM3-2, KM4 are in the normally closed state; the time relay KT coil is electrified, the delay contact KT is closed and then disconnected, and the S end of the RS flip-flop 3 appears low level delay and then becomes high level, so that the Q end output of the RS flip-flop 3 is set to high level.

[0060] The equivalent resistance RBC in the equivalent circuit 1 of the fluorescent lamp is connected in series with the resistance R4 and the 12V DC voltage source through the normally closed contact of the relay KM1-1 and KM1-2, and the voltage -UT1 divided on the resistance RBC is transmitted to the first double limit voltage comparison circuit 2; the potentiometers R2 and R3 are connected with the 12V power source and are used to set the upper limit voltage URH1 and the lower limit voltage URL1 respectively.

[0061] If the resistance RBC selected by the student is correct, that is, the voltage on the resistance RBC is between URH1 and URL1, the first double limit voltage comparison circuit 2 outputs low level to the R end of the RS flip-flop 3, so that the Q end of the RS flip-flop 3 changes to low level and remains unchanged; thus the triode T1 in the photoelectric coupler 4 is cut off, the T1 collector end outputs high level, the triode T2 is turned on, the relay KM1 coil is powered, the light emitting diode LED1 is lighted, indicating that the resistance value of the equivalent resistance RBC is correct. After the KM1 coil is powered, the KM1-1 and KM1-2 are connected to the normally open contact, so that the equivalent resistance RBC and the power switch K are connected, and are connected to the fuse FU and the line voltage L through the K. In this way, the inductive ballast and the left filament and the starter of the fluorescent lamp tube in the fluorescent lamp experimental circuit are connected through the power switch K and the fuse FU, and are connected to the line voltage L through the fuse FU.

[0062] The equivalent resistance RDE is connected in series with the resistances R15 and R16 and the 12V DC voltage source through the normally closed contact of the relay KM2-1 and KM2-2, and the voltage -UT2 divided on the series circuit of the resistances RBC and R16 is transmitted to the second double limit voltage comparison circuit 5; the potentiometers R7 and R8 are connected with the 12V power source and are used to set the upper limit voltage URH2 and the lower limit voltage URL2 respectively.

[0063] If the voltage selected by RDE is correct, that is, the voltage is between URH2 and URL2, the second double limit voltage comparison circuit 5 outputs low level; the low level and the low level kept at the Q end of the RS flip-flop 3 are outputted as high level through the NOR gate G1, so that the relay KM2 coil is powered, the light emitting diode LED2 is lighted, indicating that the value selected by RDE is correct.

[0064] After the KM2 coil is powered, the normally open contact of the contacts KM2-1 and KM2-2 is closed, the equivalent resistance RDE is connected with the equivalent resistance RBC, that is, the right filament of the fluorescent lamp in the main circuit is connected to: 1. the other end of the starter, 2. the IP+ end of the IRL current detection circuit 7 ACS712; the next step of the IRL current detection can be carried out normally.

[0065] The IP+ end of the IRL current detection circuit 7 ACS712 is connected to the fluorescent lamp circuit, and the IP- end is connected to the phase voltage N end through the normally closed contact of KM3-1. The current IRL flowing through the fluorescent lamp circuit flows into the ACS712, and when the current flowing through the copper foil in the ACS712 (Hall sensor) generates a magnetic field, the Hall element induces a linear voltage signal according to the magnetic field, which directly reflects the size of the current flowing through the copper foil. After being amplified, filtered, chopped and corrected by the internal circuit, a voltage signal is output from the VIOUT end. If the voltage signal meets the preset value, the operational amplifier outputs a high level, and when the output is high, the LED3 indicator light is turned on, and the relay KM3 contact is actuated. The normally closed contact connected to the N end is disconnected, and the normally open contact is closed, connecting the fluorescent lamp main circuit to the phase voltage N end. At the same time, the normally open contact of KM3-2 is closed, connecting the capacitor C and the IC current detection circuit 8 ACS712 IP+ end of the branch.

[0066] The IP+ end of the IC current detection circuit 8 ACS712 is connected to the capacitor C in the other branch, and the IP- end is connected to the line voltage N end through the normally closed contact of KM4. The branch current IRC flowing through the capacitor C flows into the ACS712, which generates a linear voltage signal reflecting the size of the current. The signal is sent to the inverting input terminal of the operational amplifier comparison circuit 10. If the voltage signal meets the preset value, the operational amplifier outputs a high level, and when the output is high, the LED4 indicator light is turned on, and the relay KM4 contact is actuated. The normally closed contact of KM4 connected to the N end is disconnected, and the normally open contact is closed, connecting the branch containing the capacitor C to the line voltage N end of the main circuit.

[0067] At this point, the line voltage L end of the fluorescent lamp experimental circuit, the safety tube FU, and the switch K are connected to the left end of the inductive ballast and the filament and starter of the fluorescent lamp through the normally open contact of KM1-1, and are connected to the right end of the fluorescent lamp through the normally open contact of KM2-1. The right end of the fluorescent lamp is connected to the IP+ end of the IRL current detection circuit 7 ACS712 through KM2-2, and the IP- end is connected to the phase voltage N end of the main circuit through the normally open contact of KM3-1. At the same time, the normally open contacts of KM3-2 and KM4 connect the capacitors to the phase voltage N end. That is, the fluorescent lamp automatic detection device completes all automatic detection steps and completely automatically connects the fluorescent lamp experimental circuit, so that students can conduct normal experiments.

[0068] If the resistance value of the equivalent resistance RBC is selected incorrectly, that is, the voltage on the resistance RBC is greater than URH1 or less than URL1, the first double limit voltage comparison circuit 2 outputs a high level to the R end of the RS flip-flop 3; the Q end of the RS flip-flop 3 still keeps the high level set when starting unchanged; the transistor T1 in the photoelectric coupler 4 is saturated and turned on, the T1 collector output is low, the transistor T2 is not turned on, the relay coil KM1 keeps de-energized and not working, the light emitting diode LED1 is in an extinguished state, and the student is reminded to reselect the resistance value of the equivalent resistance. At the same time, the Q end of the RS flip-flop 3 outputs a high level to the NAND gate G1, which will directly lead to the output of the G1 being low, the relay KM2 coil is de-energized, the light emitting diode LED2 keeps extinguished, the KM2 contact is not actuated, and the equivalent circuit of the fluorescent lamp is not connected, that is, it is necessary to check whether the connection of the inductive ballast and the left filament circuit of the fluorescent lamp tube is correct or whether the left filament is burned out.

[0069] If the resistance value of the equivalent resistance RBC is correct and the resistance value of the RDE is incorrect, that is, the voltage is greater than URH2 or less than URL2, the second double limit voltage comparison circuit 5 outputs a high level; this high level and the low level kept by the Q end of the RS flip-flop 3 are output as low through the NAND gate G, the relay KM2 coil is de-energized, the contact is not actuated, and the light emitting diode LED2 keeps extinguished. The student is reminded to reselect the resistance value of RDE, that is, it is necessary to check whether the connection of the circuit is correct or whether the right filament is burned out.

[0070] If the current flowing into the IRL current detection circuit 7 ACS712 does not meet the preset value, the voltage signal output from the VIOUT end is sent to the inverting end of the operational amplifier comparison circuit one 9, when the operational amplifier comparison circuit one 9 outputs low, the LED3 indicator light keeps extinguished, the relay KM3-1, KM3-2 contacts are not actuated, the main circuit of the fluorescent lamp continues to be connected to the phase voltage N end, at the same time, the normally open contact of the KM3-2 still keeps disconnected, and the capacitor C in the other branch keeps disconnected from the main circuit.

[0071] If the current flowing into the IRL current detection circuit 7 ACS712 meets the preset value, and the current flowing into the IC current detection circuit 8 ACS712 does not meet the preset value, the voltage signal output from the VIOUT end is sent to the inverting end of the operational amplifier comparison circuit two 10, when the operational amplifier comparison circuit one 10 outputs low, the LED4 indicator light keeps extinguished, the relay KM4 contact is not actuated, and the capacitor C in the branch keeps disconnected from the main circuit.

[0072] In the fluorescent lamp circuit experiment teaching, multiple groups of students need to check the parameters of the fluorescent lamp experimental circuit by the teacher in the same time period, so as to carry out the next step of operation. The utility model discloses through the opening and closing of relay conversion contact, whether the equivalent resistance value selection in the fluorescent lamp experimental circuit is correct is judged by two double limit voltage comparison circuits respectively,

[0073] Whether the current of two branches meets the preset value is discriminated by two IC current detection circuits ACS712 circuits, the light and dark of the light emitting diode are given as a prompt, and finally the fluorescent lamp equivalent circuit is automatically completely closed.

[0074] The utility model provides a kind of fluorescent lamp circuit detection device, student completes fluorescent lamp circuit experiment using the device, whether the equivalent resistance, load current value in fluorescent lamp experimental circuit is correct can be automatically helped student to judge. Promote the ability of student self-learning and error correction, improve student operation level, improve teaching quality and teaching progress.

[0075] The above detailed description of the specific embodiments of the utility model is combined with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by those skilled in the art without departing from the purpose of the utility model.

Claims

1. A fluorescent lamp circuit detection device, characterized in that: The equivalent circuit of fluorescent lamp (1), the first double limit voltage comparison circuit (2), RS trigger (3), photoelectric coupler (4), the second double limit voltage comparison circuit (5), 12V to 5V circuit (6), IRL current detection circuit (7), IC current detection circuit (8), operational amplifier comparison circuit one (9), operational amplifier comparison circuit two (10) are included; The equivalent circuit of fluorescent lamp (1) is used as daylight lamp equivalent input, connected to the first double limit voltage comparison circuit (2), IRL current detection circuit (7) and IC current detection circuit (8), the output of the first double limit voltage comparison circuit (2) is used to control RS trigger (3), RS trigger (3) controls relay KM1 through photoelectric coupler (4) and drives light emitting diode LED1; RS trigger (3) and the second double limit voltage comparison circuit (5) are connected with or gate G1, which is used to control the state of relay KM2 and LED2; the output of IRL current detection circuit (7) connected with operational amplifier comparison circuit one (9) is used to control relay KM3 and LED3, and the output of IC current detection circuit (8) connected with operational amplifier comparison circuit two (10) is used to control relay KM4 and LED4; 12V to 5V circuit (6) is used for power supply.

2. The fluorescent lamp circuit detection apparatus according to claim 1, characterized by: The equivalent circuit of fluorescent lamp (1) includes line voltage L end, fuse FU, power switch K, relay KM1 conversion contact KM1-1, equivalent resistance RBC, relay KM1 conversion contact KM1-2, relay KM2 conversion contact KM2-1, equivalent resistance RDE, relay KM2 conversion contact KM2-2, IP+ end of IRL current detection circuit ACS712, IP- end, relay KM3 conversion contact KM3-1, phase voltage N end, relay KM3 conversion contact KM3-2, IP+ end of IC current detection circuit ACS712, IP- end, relay KM4 conversion contact; The line voltage L end is connected with fuse FU, the other end of fuse FU is connected with the common end of power switch K, the normally open contact of power switch K is connected with the normally open contact of relay KM1-1, the common end of KM1-1 is connected with one end of resistance RBC, the other end of resistance RBC is connected with the common end of relay KM1-2, the normally open contact of KM1-2 is connected with the normally open contact of relay KM2-1, the common end of relay KM2-1 is connected with one end of resistance RDE, the other end of RDE is connected with the common end of relay KM2-2, the normally open contact of KM2-2 is connected with the IP+ end of IRL current detection circuit ACS712, the IP- end of ACS712 is connected with the common end of relay KM3-1, the normally open contact of KM3-1 is connected with phase voltage N; one end of capacitor C8 is connected with the normally open contact of power switch K, the other end is connected with the common end of relay KM3-2, the normally open contact of KM3-2 is connected with the IP+ end of ACS712 of IC current detection circuit (8), the IP- end of ACS712 is connected with the common end of relay KM4, and the normally open contact of relay KM4 is connected with phase voltage N end.

3. The fluorescent lamp circuit detection apparatus according to claim 1, characterized by: The first double limit voltage comparison circuit (2) comprises integrated operational amplifier A1, A2, diode D1, D2; the same-phase terminal of integrated operational amplifier A1 is connected with the inverse-phase terminal of integrated operational amplifier A2, serving as the input terminal of the first double limit voltage comparison circuit (2); the inverse-phase terminal of integrated operational amplifier A1 and the same-phase terminal of integrated operational amplifier A2 are connected with the middle terminals of potentiometer R3, R2 respectively; the one ends of potentiometer R2, R3 are connected with each other and then connected with 12V DC voltage source through resistor R1, and the other ends are connected with each other and then grounded; the output terminals of integrated operational amplifier A1, A2 are connected with the anodes of diode D1, D2 respectively, and the cathodes of diode D1, D2 are connected with each other and then serve as the output terminal of the first double limit voltage comparison circuit (2).

4. The fluorescent lamp circuit detection apparatus according to claim 1, characterized by: The normally closed contact of the relay KM1 conversion contact KM1-1 is connected with 12V DC voltage source through resistor R4; the normally closed contact of KM2-1 is connected with the connection point UT1 of resistor R4 and is connected with the input terminal of the first double limit voltage comparison circuit (2); the common terminal of KM1-2 is connected with one end of RBC, and the other end is connected with the common terminal of relay KM2-1, and the normally closed contact is grounded; The normally closed contact of the relay KM2 conversion contact KM2-1 is connected with 12V DC voltage source through resistor R15; the normally closed contact of KM2-1 is connected with the connection point UT2 of resistor R15 and is connected with the input terminal of the second double limit voltage comparison circuit (5); the common terminal of KM2-1 is connected with one end of RDE, and the other end is connected with the common terminal of relay KM2-2, and the normally closed contact of relay KM2-2 is connected with resistor R16, and the other end of R16 is grounded.

5. The fluorescent lamp circuit detection apparatus according to claim 1, characterized by: 12V DC voltage source is connected with resistor R5 and time relay KT coil in series and then grounded; the S terminal of RS flip-flop (3) is connected with ground through delay contact KT; The Q terminal of the RS flip-flop (3) is connected with the anode of diode D6 of photoelectric coupler (4) through resistor R9, and the cathode of diode D6 is grounded; the collector terminal of triode T1 of photoelectric coupler (4) is connected with one end of resistor R10, R13; the emitter of triode T1 is grounded; the other end of resistor R10 is connected with 12V DC voltage source; the other end of resistor R13 is connected with the base of triode T2; 12V DC voltage source is connected with the collector of triode T2 through resistor R11 and relay KM1 coil; 12V DC voltage source is connected with the anode of light-emitting diode LED1 through resistor R12, and the cathode of light-emitting diode LED1 is connected with the collector of triode T2; the emitter of triode T2 is grounded.

6. The fluorescent lamp circuit detection apparatus according to claim 1, characterized by: The second double limited voltage comparison circuit (5) includes integrated operational amplifier A3, A4, diode D3, D4; the same phase end of integrated operational amplifier A3 is connected with the opposite phase end of integrated operational amplifier A4, as the input end of the second double limited voltage comparison circuit (5); the opposite phase end of integrated operational amplifier A3 and the same phase end of integrated operational amplifier A4 are connected with the middle end of potentiometer R8, R7 respectively; the one end of potentiometer R7, R8 is connected after being connected with each other, and the other end is connected after being connected with each other, and is grounded; the output end of integrated operational amplifier A3, A4 is connected with the anode of diode D3, D4 respectively, and the cathode of diode D3, D4 is connected after being connected, and is used as the output end of the second double limited voltage comparison circuit (5); The normally closed contact of the conversion contact KM2-1 of the relay KM2 is connected with the input end of the second double limited voltage comparison circuit (5); the output end of the second double limited voltage comparison circuit (5) is connected with the Q end of the RS trigger (3) respectively or the two input ends of the or gate G1; the output end of the or gate G1 is connected with the anode of the light emitting diode LED2 through the resistance R14; the cathode of the light emitting diode LED2 is grounded through the relay KM2 coil; The normally open contact of the conversion contact KM2-2 of the relay KM2 is connected with the IP+ of ACS712 of the IRL current detection circuit (7), the IP- end of which is connected with the common end of the conversion contact of the relay KM3, the normally closed contact of KM3-1 is connected with the phase voltage N end, and the normally open contact of KM3-1 is connected with the phase voltage N end of the fluorescent lamp equivalent circuit (1).

7. The fluorescent lamp circuit detection apparatus according to claim 1, characterized by: The 12V to 5V circuit (6) includes LP2980AIM5-5 low dropout linear regulator, capacitors C1, C2, C3; the capacitor C1 is used for filtering the input 12V power supply; the LP2980AIM5-5 low dropout linear regulator is used for converting the input 12V voltage to 5V output, the V1N pin is connected with the 12V input voltage, the GND pin is grounded, and the VOUT pin outputs stable 5V voltage; the capacitors C2, C3 are connected between the VOUT pin and the ground respectively, for ensuring the stable 5V output.

8. The fluorescent lamp circuit detection apparatus of claim 1, wherein: The IRL current detection circuit (7) includes a current sensor module ACS712, and an operational amplifier comparison circuit one (9) includes an operational amplifier A6, capacitors C4, C5, resistors R17, R18, a light emitting diode LED3 and a relay KM3; The VIOUT end of ACS712 of the IRL current detection circuit (7) is connected with the opposite phase input end of the operational amplifier comparison circuit one (9), the VCC of ACS712 is connected with the 5V power supply, the FILTER end is connected with one end of the capacitor C4, the other end of C4 is grounded, and the GND end is grounded; the 5V power supply end is grounded through the capacitor C5; The non-inverting input of the operational amplifier comparison circuit one (9) is connected to the middle terminal of the potentiometer R18, one terminal of R18 is connected to 5V power supply, and the other terminal is connected to ground; the inverting input is connected to the VIOUT terminal of ACS712; the output of the operational amplifier comparison circuit one (9) is connected to one terminal of the resistor R17, the other terminal of R17 is connected to the anode of the light emitting diode LED3, and the cathode is connected to the control terminal of the relay KM3, the other terminal of KM3 is connected to ground; the 4, 1, 5 pins of the operational amplifier comparison circuit one (9) are connected to ground, and the 7 pin is connected to 5V power supply.

9. The fluorescent lamp circuit detection apparatus of claim 1, wherein: The IC current detection circuit (8) includes a current sensor module ACS712, and the operational amplifier comparison circuit two (10) includes an operational amplifier A5, capacitors C6 and C7, resistors R19 and R20, a light emitting diode LED4, and a relay KM4. The filter capacitor C8 is connected to the switching contact KM1-1 of the relay KM1, and the other terminal of C8 is connected to the IP+ terminal of ACS712 of the IC current detection circuit (8) through the normally open contact of the relay KM3-2, and the IP- terminal is connected to the common terminal of the switching contact of the relay KM4, the normally closed contact of KM4 is connected to the phase voltage N terminal, and the normally open contact of KM4 is connected to the phase voltage N terminal of the fluorescent lamp equivalent circuit (1); The VIOUT terminal of ACS712 of the IC current detection circuit (8) is connected to the inverting input of the operational amplifier comparison circuit two (10), the VCC terminal of ACS712 is connected to 5V power supply, the FILTER terminal is connected to one terminal of the capacitor C6, the other terminal of C6 is connected to ground, and the GND terminal is connected to ground; the 5V power supply terminal is connected to ground through the capacitor C7; The non-inverting input of the operational amplifier comparison circuit two (10) is connected to the middle terminal of the potentiometer R20, one terminal of R20 is connected to 5V power supply, and the other terminal is connected to ground; the inverting input is connected to the VIOUT terminal of ACS712; the output of the operational amplifier comparison circuit two (10) is connected to one terminal of the resistor R19, the other terminal of R19 is connected to the anode of the light emitting diode LED4, and the cathode is connected to the control terminal of the relay KM4, the other terminal of KM4 is connected to ground; the 4, 1, 5 pins of the operational amplifier comparison circuit two (10) are connected to ground, and the 7 pin is connected to 5V power supply.

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