CN111526642A - Overvoltage protection type switching power supply controller for tunnel lighting system - Google Patents

Overvoltage protection type switching power supply controller for tunnel lighting system Download PDF

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Publication number
CN111526642A
CN111526642A CN202010389541.3A CN202010389541A CN111526642A CN 111526642 A CN111526642 A CN 111526642A CN 202010389541 A CN202010389541 A CN 202010389541A CN 111526642 A CN111526642 A CN 111526642A
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polar capacitor
diode
resistor
pin
pole
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CN202010389541.3A
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Chinese (zh)
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张翼亮
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Shanghai Yiliang Industrial Co ltd
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Shanghai Yiliang Industrial Co ltd
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Priority to CN202010389541.3A priority Critical patent/CN111526642A/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H02M1/15—Arrangements for reducing ripples from dc input or output using active elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/34—Voltage stabilisation; Maintaining constant voltage
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0012—Control circuits using digital or numerical techniques
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Power Conversion In General (AREA)

Abstract

The invention discloses an overvoltage protection type switching power supply controller for a tunnel lighting system, which comprises a single chip microcomputer, a power supply, an A/D conversion module, a switching control unit and an image collector, wherein the power supply, the A/D conversion module and the switching control unit are all connected with the single chip microcomputer, and the image collector is connected with the A/D conversion module. The overvoltage protection circuit of the switch control unit provided by the invention can eliminate or inhibit instantaneous high voltage generated in voltage input, and can effectively prevent a rear-end electronic element and a tunnel lighting system from being damaged by the high voltage; meanwhile, the multi-harmonic oscillation circuit restrains or eliminates harmonic waves in the direct current voltage, and can limit or adjust instantaneous high current generated when the direct current voltage is loaded, so that the direct current voltage is cleaner and more stable, the stabilization effect of the output voltage of the tunnel lighting system is improved, the tunnel lighting system can be effectively prevented from flickering, and the service life of the tunnel lighting system can be effectively prolonged.

Description

Overvoltage protection type switching power supply controller for tunnel lighting system
Technical Field
The invention relates to a switching power supply controller, in particular to an overvoltage protection type switching power supply controller for a tunnel lighting system.
The tunnel lighting system is an important implementation in tunnel construction, and the tunnel lighting system is an important guarantee implementation for ensuring normal traffic of vehicles in the tunnel. However, most of the switching power controllers of the tunnel lighting systems are normally open, and the switching power controllers also have the problem of poor stability of output voltage, so that the tunnel lighting systems often flicker during working, and great potential safety hazards are brought to tunnel driving.
Disclosure of Invention
The invention aims to overcome the defects of the switching power supply controller of the tunnel lighting system in the prior art, and provides an overvoltage protection type switching power supply controller for the tunnel lighting system.
The invention is realized by the following technical scheme: an overvoltage protection type switch power supply controller for a tunnel lighting system comprises a single chip microcomputer, a power supply, an A/D conversion module, a switch control unit and an image collector, wherein the power supply, the A/D conversion module and the switch control unit are all connected with the single chip microcomputer; the switch control unit comprises a rectification filter module connected with the singlechip, a current limiting circuit connected with the rectification filter module, a multivibrator circuit and an overvoltage protection circuit which are respectively connected with the current limiting circuit, and a constant current driving circuit connected with the multivibrator circuit; the rectifying and filtering module comprises a diode rectifier U1, and a polar capacitor C1, wherein the anode of the polar capacitor C1 is connected with the anode output end of a diode rectifier U1, and the cathode of the polar capacitor C1 is grounded after being connected with the cathode output end of a diode rectifier U1; two input ends of the diode rectifier U1 are respectively connected with the single chip microcomputer; and the positive electrode and the negative electrode of the polar capacitor C1 are respectively connected with the current limiting circuit.
The current limiting circuit comprises a voltage stabilizing diode D1, a resistor R1 with one end connected with the N pole of the voltage stabilizing diode D1 and the other end connected with the anode of a polar capacitor C1, a polar capacitor C4 with the anode connected with the N pole of a voltage stabilizing diode D1 through an inductor L1 and the cathode connected with an overvoltage protection circuit, and a resistor R5 with one end connected with the anode of a polar capacitor C4 and the other end connected with a multivibrator circuit; the P pole of the voltage stabilizing diode D1 is connected with the negative pole of the polar capacitor C1.
The overvoltage protection circuit comprises a triode VT1, a diode D3, a polar capacitor C2 with the anode connected with the cathode connecting point of a resistor R1 and a polar capacitor C1 and the cathode connected with the emitter of the triode VT1 after passing through a resistor R4, a diode D2 with the P pole connected with the anode of the polar capacitor C2 and the N pole connected with the emitter of the triode VT1, a polar capacitor C3 with the anode connected with the P pole of the diode D2 and the cathode connected with the collector of the triode VT1, an adjustable resistor R2 with one end connected with the anode of the polar capacitor C3 and the other end connected with the P pole of the diode D3, and a resistor R3 with one end connected with the P pole of the diode D3 and the other end connected with the base of the triode VT 1; the emitting electrode of the triode VT1 is connected with the negative electrode of the polar capacitor C4 and then is grounded; the P pole of the diode D3 is used as the output end of the overvoltage protection circuit.
The multi-resonant circuit comprises a control chip U2, a triode VT2, a polar capacitor C5 with the negative electrode connected with an OSC1 pin of the control chip U2 and the positive electrode connected with the base electrode of the triode VT2 after passing through an adjustable resistor R6, a diode D4 with the P electrode connected with a KEY pin of the control chip U2 and the N electrode connected with the base electrode of the triode VT2, and an inductor L2 with one end connected with the OSC2 pin of the control chip U2 and the other end connected with the base electrode of the triode VT 2; the collector of the triode VT2 is grounded, and the emitter of the triode VT2 is respectively connected with the VSS pin of the control chip U2 and the constant current driving circuit; the N pole of the diode D4 is also connected with the adjustable end of the adjustable resistor R6; the GND pin of the control chip U2 is grounded; the pins Q1, Q2 and Q3 of the control chip U2 are respectively connected with a constant current driving circuit, and the pin VDD of the control chip U2 is connected with the anode of a polar capacitor C4 through a resistor R5.
The constant current driving circuit comprises a driving chip U3, a triode VT3 and a unidirectional thyristor VS, wherein the anode of the polar capacitor C6 is connected with the CTRL pin of the driving chip U3 after passing through a resistor R11, the cathode of the polar capacitor C6 is connected with the Q3 pin of a control chip U2, the anode of the polar capacitor C7 is connected with the VIN pin of the driving chip U3, the cathode of the polar capacitor C7 is connected with the Q2 pin of the control chip U2, a resistor R10 with one end connected with the cathode of the polar capacitor C7 and the other end grounded, the P electrode of the polar capacitor C465 is connected with the VIN pin of the driving chip U3, the N electrode of the diode D5 is connected with the SET pin of the driving chip U3, a resistor R12 with one end connected with the N electrode of the diode D5 and the other end of the base of the triode VT3, the anode of the polar capacitor C8 is connected with the base of the triode VT 9, the cathode of the polar capacitor, A diode D6 with the N pole connected with the emitter of the triode VT3, a polar capacitor C9 with the anode connected with the adjusting end of the unidirectional thyristor VS after passing through a resistor R8 and the cathode connected with the emitter of the triode VT3 after passing through an adjustable resistor R13, and a resistor R7 with one end connected with the anode of the unidirectional thyristor VS and the other end as the output end of the constant current driving circuit; the GND pin of the driving chip U3 is grounded, and the VIN pin of the driving chip U3 is connected with the Q1 pin of the control chip U2; the collector of the triode VT3 is grounded, and the base of the triode VT3 is connected with the adjusting end of the unidirectional thyristor VS; and the N pole of the unidirectional thyristor VS is connected with the VSS pin of the driving chip U2 and then grounded.
In order to ensure the practical use effect of the invention, the image collector is a TR350 type image collector. The driving chip U3 is AL8807A integrated chip. The control chip U2 is an HCF4060 integrated chip.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the image collector of the invention transmits the monitored information in the use range of the tunnel lighting system to the single chip microcomputer, and the single chip microcomputer can control the tunnel lighting system to be turned on or turned off by analyzing the received information.
(2) The overvoltage protection circuit of the switch control unit provided by the invention can eliminate or inhibit instantaneous high voltage generated in voltage input, and can effectively prevent a rear-end electronic element and a tunnel lighting system from being damaged by the high voltage; meanwhile, the multi-harmonic oscillation circuit suppresses or eliminates harmonic waves in the direct current voltage, and can limit or adjust instantaneous high current generated when the direct current voltage is loaded, so that the direct current voltage is cleaner and more stable, the stabilization effect of the output voltage of the tunnel lighting system is improved, the tunnel lighting system can be effectively prevented from flickering, the working stability of the tunnel lighting system is ensured, and the service life of the tunnel lighting system can be effectively prolonged.
(3) The constant current driving circuit has high precision and stable current, and can provide stable working current for the tunnel lighting system when the singlechip outputs control current to the constant current driving circuit, thereby improving the stability of the switching power supply controller.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic circuit diagram of the switch control unit according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Examples
As shown in fig. 1, the overvoltage protection type switching power supply controller for a tunnel lighting system of the present invention includes a single chip, a power supply, an a/D conversion module, a switching control unit, and an image collector connected to the a/D conversion module, all of which are connected to the single chip.
When the invention is implemented, the singlechip is an FP7103 integrated chip, an LX pin of the FP7103 integrated chip is connected with the A/D conversion module, and a VCC pin is connected with a power supply. The power supply is 12V direct current voltage, and the 12V direct current voltage supplies power for the singlechip.
In order to better implement the invention, the image collector preferentially adopts a TR350 type image collector with high sensitivity and wide monitoring range, and is used for collecting image signals in the tunnel and transmitting the collected image signals to the singlechip through the A/D conversion module. The A/D conversion module can eliminate interference signals in the vehicle information in the tunnel collected by the image collector, and simultaneously outputs electric pulse signals to the singlechip. The singlechip outputs current to the switch control unit, the switch control unit outputs stable driving current to the tunnel lighting system, and the tunnel lighting system is started. When the image collector collects that no vehicle leaves for a long time in the use range of the tunnel lighting system, the A/D conversion module stops outputting the electric pulse single chip microcomputer, the single chip microcomputer stops outputting the control current for the switch control unit, the switch control unit stops outputting the driving current after power failure, and the tunnel lighting system is turned off.
As shown in fig. 2, the switch control unit includes a rectifying and filtering module connected to the single chip, a current limiting circuit connected to the rectifying and filtering module, a multivibrator circuit and an overvoltage protection circuit respectively connected to the current limiting circuit, and a constant current driving circuit connected to the multivibrator circuit; the rectifying and filtering module comprises a diode rectifier U1, and a polar capacitor C1, wherein the anode of the polar capacitor C1 is connected with the anode output end of a diode rectifier U1, and the cathode of the polar capacitor C1 is grounded after being connected with the cathode output end of a diode rectifier U1; two input ends of the diode rectifier U1 are respectively connected with the single chip microcomputer; and the positive electrode and the negative electrode of the polar capacitor C1 are respectively connected with the current limiting circuit.
Further, the current limiting circuit comprises a voltage stabilizing diode D1, a resistor R1, a resistor R5 and a polar capacitor C4.
When connected, one end of the resistor R1 is connected to the N-pole of the zener diode D1, and the other end is connected to the positive electrode of the polar capacitor C1. The anode of the polar capacitor C4 is connected with the N-pole of the zener diode D1 through the inductor L1, and the cathode is connected with the overvoltage protection circuit. One end of the resistor R5 is connected to the positive electrode of the polar capacitor C4, and the other end is connected to the multivibrator circuit. The P pole of the voltage stabilizing diode D1 is connected with the negative pole of the polar capacitor C1.
The overvoltage protection circuit comprises a triode VT1, a diode D2, a diode D3, a polar capacitor C2, a polar capacitor C3, an adjustable resistor R2 and a resistor R3.
When the polarity capacitor C2 is connected, the anode of the polarity capacitor C2 is connected with the cathode connection point of the resistor R1 and the polarity capacitor C1, and the cathode is connected with the emitter of the triode VT1 after passing through the resistor R4. The P pole of the diode D2 is connected to the positive pole of the polar capacitor C2, and the N pole is connected to the emitter of the transistor VT 1. The anode of the polar capacitor C3 is connected to the P-pole of the diode D2, and the cathode is connected to the collector of the transistor VT 1. One end of the adjustable resistor R2 is connected with the anode of the polar capacitor C3, and the other end is connected with the P pole of the diode D3. One end of the resistor R3 is connected to the P-pole of the diode D3, and the other end is connected to the base of the transistor VT 1. The emitting electrode of the triode VT1 is connected with the negative electrode of the polar capacitor C4 and then is grounded; the P pole of the diode D3 is used as the output end of the overvoltage protection circuit.
Still further, the multivibrator circuit includes control chip U2, triode VT2, polar capacitor C5, diode D4, inductance L2.
When the polarity capacitor C5 is connected, the negative electrode of the polarity capacitor C5 is connected with the OSC1 pin of the control chip U2, and the positive electrode of the polarity capacitor C5 is connected with the base electrode of the triode VT2 after passing through the adjustable resistor R6. The P pole of the diode D4 is connected with the KEY pin of the control chip U2, and the N pole is connected with the base of the transistor VT 2. One end of the inductor L2 is connected to the OSC2 pin of the control chip U2, and the other end is connected to the base of the transistor VT 2. The collector of the triode VT2 is grounded, and the emitter of the triode VT2 is respectively connected with the VSS pin of the control chip U2 and the constant current driving circuit; the N pole of the diode D4 is also connected with the adjustable end of the adjustable resistor R6; the GND pin of the control chip U2 is grounded; the pins Q1, Q2 and Q3 of the control chip U2 are respectively connected with a constant current driving circuit, and the VDD pin of the control chip U2 is connected with the anode of a polar capacitor C4 through a resistor R5.
The constant current driving circuit comprises a driving chip U3, a triode VT3, a unidirectional thyristor VS, a polar capacitor C6, a polar capacitor C7, a polar capacitor C8, a polar capacitor C9, a resistor R7, a resistor R10, a resistor R12, a diode D5 and a diode D6.
When the polarity capacitor C6 is connected, the positive electrode of the polarity capacitor C6 is connected with the CTRL pin of the driving chip U3 through the resistor R11, and the negative electrode of the polarity capacitor C6 is connected with the Q3 pin of the control chip U2. The positive electrode of the polar capacitor C7 is connected with the VIN pin of the driving chip U3, and the negative electrode of the polar capacitor C7 is connected with the Q2 pin of the control chip U2. One end of the resistor R10 is connected with the negative electrode of the polar capacitor C7, and the other end is grounded. The P pole of the diode D5 is connected to the VIN pin of the driver chip U3, and the N pole is connected to the SET pin of the driver chip U3. One end of the resistor R12 is connected to the N-pole of the diode D5, and the other end is connected to the base of the transistor VT 3. The anode of the polar capacitor C8 is connected with the base of the triode VT3, and the cathode is connected with the anode of the polar capacitor C7 after passing through the resistor R9.
The P pole of the diode D6 is connected to the SW pin of the driver chip U3, and the N pole is connected to the emitter of the transistor VT 3. The anode of the polar capacitor C9 is connected with the adjusting end of the unidirectional thyristor VS through the resistor R8, and the cathode is connected with the emitter of the triode VT3 through the adjustable resistor R13. One end of the resistor R7 is connected with the anode of the unidirectional thyristor VS, and the other end is used as the output end of the constant current driving circuit. The GND pin of the driving chip U3 is grounded, and the VIN pin of the driving chip U3 is connected with the Q1 pin of the control chip U2; the collector of the triode VT3 is grounded, and the base of the triode VT3 is connected with the adjusting end of the unidirectional thyristor VS; and the N pole of the unidirectional thyristor VS is connected with the VSS pin of the driving chip U2 and then grounded.
In order to ensure the practical use effect of the invention, the control chip U2 is a HCF4060 frequency division integrated chip. The driving chip U3 is AL8807A integrated chip. The unidirectional thyristor VS is a TYN625 unidirectional thyristor. The diode rectifier U1 is a diode rectifier consisting of 4 1N4004 silicon rectifier diodes; meanwhile, the triode VT1 is a 3AX31 triode, and the triodes VT2 and VT3 are both 3DG06 triodes; the resistance Rl is a 500k omega metal film resistor, the adjustable range of the resistance of the adjustable resistor R2 is 10-1000 k omega, the resistance of the resistor R3 is 3.3k omega, the resistance of the resistor R4 is 4.7k omega, the resistance of the resistor R5 is 200k omega, the resistance of the resistor R6 is 20-200 k omega, the resistances of the resistors R7-R9 are all 5k omega, the resistance of the resistor R10 is 100 omega, the resistance of the resistor R11 is 10k omega, and the resistances of the resistor R12 and the resistor R13 are both 15k omega; the polar capacitor C1 and the polar capacitor C4 are both 1000 muF/16V aluminum electrolytic capacitors, the capacity value of the polar capacitor C2 is 470 muF/25V, the capacity value of the polar capacitor C3 is 8 muF/25V, the capacity value of the polar capacitor C5 is 100 muF/25V, and the capacity values of the polar capacitor C6, the polar capacitor C7 and the polar capacitor C8 are all 10 muF/16V; the voltage-stabilizing diode D1 is a 1N4016 voltage-stabilizing diode, the diode D2 and the diode D3 are 1N4011 diodes, and the diode D4, the diode D5 and the diode D6 are 1N5406 diodes; the inductor L1 and the inductor L2 are both magnetic core inductors with the voltage of 100 muP/50 Vd.
When the rectifier circuit operates, the diode rectifier U1 and the polar capacitor C1 form a rectifier filter, the voltage input by the singlechip is rectified by the diode rectifier U1 of the rectifier filter to generate direct-current voltage, the polar capacitor C1 eliminates harmonic waves in the generated direct-current voltage to ensure that the direct-current voltage is cleaner, the filtered direct-current voltage is transmitted to a current limiting circuit formed by a voltage stabilizing diode D1, a resistor R1, a resistor R5, an inductor L1 and a polar capacitor C4, the current limiting circuit limits instantaneous high current generated when the direct-current voltage is loaded and releases the current through a polar capacitor C4 to ensure that the direct-current voltage is more stable, the direct-current voltage is limited by the current limiting circuit to obtain stable 6.8V direct-current voltage, and the current limiting circuit transmits the 6.8V direct-current voltage to a multi-harmonic oscillation circuit formed by a control chip U2, the polar capacitor C5, an adjustable resistor R6, an inductor L2 and a diode D4, and the stable 6.8V direct current voltage is simultaneously used as the working voltage of the control chip U2.
When the multivibrator circuit is powered on, the multivibrator circuit starts to oscillate the overcurrent, the control chip U2 performs frequency division counting on oscillation signals generated by the multivibrator, the control chip U2 outputs variable control levels through the Q1 pin, the Q2 pin and the Q3 pin, so that the driving chip U3 of the constant current driving circuit is intermittently conducted to output different currents, the currents are limited in voltage and current through a cut-off channel formed by a diode D5 and a diode D6 which are externally connected with the driving chip U3, a triode VT3 and an adjustable resistor R13 source electrode polar capacitor C9 form a galvanostat to keep current pulses constant and then transmit the current pulses to a unidirectional thyristor VS, and a resistor R7 on the negative electrode of the unidirectional thyristor can further buffer the output voltage, so that the output current is more stable. When the invention works, the brightness of the tunnel lighting system can be changed by adjusting the resistance value of the adjustable resistor R13.
In order to prevent the electronic element at the rear end of the diode rectifier U1 and the tunnel lighting system from being damaged by transient high voltage generated when voltage is input, an overvoltage protection circuit formed by a triode VT1, a polar capacitor C2, a polar capacitor C3, a diode D2, a diode D3, an adjustable resistor R2, a resistor R3 and a resistor R4 is arranged between the anode output end of the diode rectifier U1 and the LED flashlight strip LEDW, when high voltage is generated when the anode output end of the diode rectifier U1 outputs voltage, the adjustable resistor R2 is a high-impedance resistor of 10-1000 k Ω, the resistance value of the adjustable resistor R2 is changed to cut off the high voltage, meanwhile, the polar capacitor C2 and the polar capacitor C3 start charging, the triode VT1 starts discharging when the polar capacitor C2 and the polar capacitor C3 are saturated, the triode 1 is powered on, the triode 1 releases voltage, the voltage, and the triode VT3 and the diode D3 outputs stable direct current voltage of 6.8V, therefore, the overvoltage protection circuit can eliminate or inhibit the instantaneous high voltage generated when the voltage is input, and can effectively prevent the rear-end electronic element and the tunnel lighting system from being damaged by the high voltage, thereby improving the stability of the output voltage of the invention and effectively prolonging the service life of the tunnel lighting system.
As described above, the present invention can be preferably realized.

Claims (8)

1. The utility model provides a tunnel lighting system is with overvoltage protection formula switching power supply controller which characterized in that: the system comprises a singlechip, a power supply, an A/D conversion module, a switch control unit and an image collector, wherein the power supply, the A/D conversion module and the switch control unit are all connected with the singlechip; the switch control unit comprises a rectification filter module connected with the singlechip, a current limiting circuit connected with the rectification filter module, a multivibrator circuit and an overvoltage protection circuit which are respectively connected with the current limiting circuit, and a constant current driving circuit connected with the multivibrator circuit; the rectifying and filtering module comprises a diode rectifier U1, and a polar capacitor C1, wherein the anode of the polar capacitor C1 is connected with the anode output end of a diode rectifier U1, and the cathode of the polar capacitor C1 is grounded after being connected with the cathode output end of a diode rectifier U1; two input ends of the diode rectifier U1 are respectively connected with the single chip microcomputer; and the positive electrode and the negative electrode of the polar capacitor C1 are respectively connected with the current limiting circuit.
2. The over-voltage protection type switching power supply controller for the tunnel lighting system as claimed in claim 1, wherein the current limiting circuit comprises a zener diode D1, a resistor R1 having one end connected to the N-pole of the zener diode D1 and the other end connected to the positive pole of a polar capacitor C1, a polar capacitor C4 having a positive pole connected to the N-pole of the zener diode D1 via an inductor L1 and a negative pole connected to the over-voltage protection circuit, a resistor R5 having one end connected to the positive pole of the polar capacitor C4 and the other end connected to the multivibrator circuit; the P pole of the voltage stabilizing diode D1 is connected with the negative pole of the polar capacitor C1.
3. The overvoltage protection type switching power supply controller of claim 2, wherein the overvoltage protection circuit comprises a transistor VT1, a diode D3, a polar capacitor C2 having an anode connected to a connection point of the resistor R1 and a cathode of the polar capacitor C1, and a cathode connected to an emitter of the transistor VT1 via a resistor R4, a P connected to an anode of the polar capacitor C2, a diode D2 having an N connected to an emitter of the transistor VT1, a polar capacitor C3 having an anode connected to a P of the diode D2 and a cathode connected to a collector of the transistor VT1, an adjustable resistor R2 having one end connected to an anode of the polar capacitor C3 and the other end connected to a P of the diode D3, and a resistor R3 having one end connected to a P of the diode D3 and the other end connected to a base of the transistor VT 1; the emitting electrode of the triode VT1 is connected with the negative electrode of the polar capacitor C4 and then is grounded; the P pole of the diode D3 is used as the output end of the overvoltage protection circuit.
4. The over-voltage protection type switching power supply controller according to claim 3, wherein the multivibrator circuit comprises a control chip U2, a transistor VT2, a polar capacitor C5 having a negative electrode connected to an OSC1 pin of the control chip U2 and a positive electrode connected to a base of the transistor VT2 through an adjustable resistor R6, a diode D4 having a P electrode connected to a KEY pin of the control chip U2 and an N electrode connected to the base of the transistor VT2, and an inductor L2 having one end connected to the OSC2 pin of the control chip U2 and the other end connected to the base of the transistor VT 2; the collector of the triode VT2 is grounded, and the emitter of the triode VT2 is respectively connected with the VSS pin of the control chip U2 and the constant current driving circuit; the N pole of the diode D4 is also connected with the adjustable end of the adjustable resistor R6; the GND pin of the control chip U2 is grounded; the pins Q1, Q2 and Q3 of the control chip U2 are respectively connected with a constant current driving circuit, and the pin VDD of the control chip U2 is connected with the anode of a polar capacitor C4 through a resistor R5.
5. The overvoltage protection type switching power supply controller according to claim 4, wherein the constant current driving circuit comprises a driving chip U3, a transistor VT3, a unidirectional thyristor VS, a polar capacitor C6 having an anode connected to a CTRL pin of the driving chip U3 through a resistor R11 and a cathode connected to a Q3 pin of the control chip U2, a polar capacitor C7 having an anode connected to a VIN pin of the driving chip U3 and a cathode connected to a Q2 pin of the control chip U2, a resistor R10 having one end connected to a cathode of the polar capacitor C7 and the other end grounded, a diode D5 having a P pole connected to a VIN pin of the driving chip U3 and an N pole connected to a SET pin of the driving chip U3, a resistor R12 having one end connected to an N pole of a diode D5 and the other end connected to a base of the transistor VT3, a cathode connected to a base of the transistor VT3, A polar capacitor C8 with a negative electrode connected with the positive electrode of the polar capacitor C7 through a resistor R9, a diode D6 with a P electrode connected with a SW pin of a driving chip U3 and an N electrode connected with an emitter of a triode VT3, a polar capacitor C9 with a positive electrode connected with an adjusting end of a unidirectional thyristor VS through a resistor R8 and a negative electrode connected with an emitter of the triode VT3 through an adjustable resistor R13, and a resistor R7 with one end connected with the positive electrode of the unidirectional thyristor VS and the other end as the output end of the constant current driving circuit; the GND pin of the driving chip U3 is grounded, and the VIN pin of the driving chip U3 is connected with the Q1 pin of the control chip U2; the collector of the triode VT3 is grounded, and the base of the triode VT3 is connected with the adjusting end of the unidirectional thyristor VS; and the N pole of the unidirectional thyristor VS is connected with the VSS pin of the driving chip U2 and then grounded.
6. The overvoltage protection type switching power supply controller for the tunnel lighting system according to claim 5, wherein the image collector is a TR350 type image collector.
7. The over-voltage protection type switching power supply controller for the tunnel lighting system as claimed in claim 6, wherein said driving chip U3 is AL8807A integrated chip.
8. The overvoltage protection type switching power supply controller for the tunnel lighting system according to claim 7, wherein the control chip U2 is an HCF4060 integrated chip.
CN202010389541.3A 2020-05-10 2020-05-10 Overvoltage protection type switching power supply controller for tunnel lighting system Pending CN111526642A (en)

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CN105813279A (en) * 2016-05-30 2016-07-27 成都思博特科技有限公司 Voltage feedback-based white LED oscillatory efficiency drive system
CN205657896U (en) * 2016-03-14 2016-10-19 宁夏沃元智能技术有限公司 Multicircuit processing formula high accuracy intelligence control system for light
CN106373518A (en) * 2016-08-25 2017-02-01 成都东创精英科技有限公司 Buffer protective energy-saving light control system for large outdoor LED display screen
CN106455213A (en) * 2016-10-11 2017-02-22 四川万康节能环保科技有限公司 Overvoltage protection type energy-saving control circuit for LED flashlight strip

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205657896U (en) * 2016-03-14 2016-10-19 宁夏沃元智能技术有限公司 Multicircuit processing formula high accuracy intelligence control system for light
CN105813279A (en) * 2016-05-30 2016-07-27 成都思博特科技有限公司 Voltage feedback-based white LED oscillatory efficiency drive system
CN106373518A (en) * 2016-08-25 2017-02-01 成都东创精英科技有限公司 Buffer protective energy-saving light control system for large outdoor LED display screen
CN106455213A (en) * 2016-10-11 2017-02-22 四川万康节能环保科技有限公司 Overvoltage protection type energy-saving control circuit for LED flashlight strip

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