CN109085453B - Fault detection device and method of LED power supply device - Google Patents
Fault detection device and method of LED power supply device Download PDFInfo
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- CN109085453B CN109085453B CN201811118253.3A CN201811118253A CN109085453B CN 109085453 B CN109085453 B CN 109085453B CN 201811118253 A CN201811118253 A CN 201811118253A CN 109085453 B CN109085453 B CN 109085453B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- 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
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Abstract
The invention discloses a fault detection device and a fault detection method of an LED power supply device, wherein the fault detection device comprises a fault detection circuit, a control circuit, a first switch tube, a second switch tube and a standby circuit; the fault detection circuit is used for detecting the working state of a first switch tube, when the first switch tube is detected to be in fault, a fault signal is sent to the control circuit, the control circuit receives the fault signal and then starts the standby circuit to supply power, meanwhile, the fault troubleshooting waiting is started, after the fault troubleshooting waiting time is exceeded, a second switch tube is controlled to start working, the standby circuit is closed, and the first switch tube and the second switch tube are connected in parallel. The invention can rapidly carry out fault elimination on key devices of the LED power supply device, avoids the error elimination of the fault and improves the power supply quality after the fault elimination.
Description
Technical Field
The invention relates to the technical field of LED lighting, in particular to a fault detection device and a fault detection method for an LED power supply device.
Background
The LED light-emitting principle is that a driving power supply converts alternating current into direct current to supply power to a light-emitting diode so as to enable the light-emitting diode to emit light. The LED lamp has the advantages of long service life, low energy consumption, high color rendering property, good impact resistance and the like, is called as a green illumination light source, and is widely applied. In the prior art, power supply control is generally performed through an isolation device such as a transformer, a switching tube is arranged on a primary side of the transformer, and the switching tube is controlled through PWM to control electric energy output to an LED.
The existing mode for fault removal is replacement through a spare device, then the LED lamp tube cannot be supplied with power for a period of time due to direct replacement, meanwhile, the frequency of a control switch tube of output voltage after the device is replaced cannot well meet the power supply requirement, and the service life of the LED lamp tube is lost due to unstable power supply. Therefore, a device capable of rapidly detecting a fault and adjusting a power supply voltage in and after the fault is urgently needed to solve the technical problems of untimely fault removal, error fault removal and the like in the prior art.
Disclosure of Invention
The invention provides a fault detection device of an LED power supply device, which comprises a fault detection circuit, a control circuit, a first switch tube, a second switch tube and a standby circuit, wherein the control circuit is connected with the first switch tube; the fault detection circuit is used for detecting the working state of a first switch tube, when the first switch tube is detected to be in fault, a fault signal is sent to the control circuit, the control circuit receives the fault signal and then starts the standby circuit to supply power, meanwhile, the fault troubleshooting waiting is started, after the fault troubleshooting waiting time is exceeded, a second switch tube is controlled to start working, the standby circuit is closed, and the first switch tube and the second switch tube are connected in parallel.
The detection device, troubleshooting includes that the first switch tube is restarted three times in succession, when the three times are restarted, the output voltage is detected through the output voltage detection circuit respectively, whether the output voltage recovers to be normal is judged, the standby circuit is connected with one of the LEDs connected in series, if the output voltage recovers to be normal, the LEDs connected in series are all normally lighted, starting is added once again, if the output voltage is normal, the first switch tube is continuously used, and if the output voltage is restarted three times, the first switch tube still cannot normally work, namely when only one LED lamp is lighted, the control circuit controls the second switch tube to work and starts the output voltage adjustment control program.
The detection device also comprises a reference voltage regulating circuit and a reverse oscillation circuit; the enabling of the output voltage adjustment control routine includes enabling a regulating resistor of the reference voltage regulating circuit and enabling a counter oscillating circuit.
In the detection device, the first switch tube and the second switch tube are connected in parallel and then connected in series with a primary winding of a transformer; the standby circuit is connected with a secondary winding of the transformer in parallel, the standby circuit comprises a third switching tube G3, a fourth switching tube G4, a super capacitor C4 and a fifth switching tube G5, the third switching tube G3 and the fourth switching tube G4 form a half-bridge circuit to charge the super capacitor C4, the fifth switching tube G5 receives on-off control of the control circuit to achieve discharging and discharging stopping control, one end of the super capacitor C4 is connected with the anode of one of the LED strings through the fifth switching tube G5, and the other end of the super capacitor C4 is connected with the cathode of one of the LED strings.
The detection device is characterized in that the output voltage detection circuit comprises a high-precision voltage sensor, a buffer is arranged between the output voltage detection circuit and the comparison circuit, the buffer comprises at least one negative input end which is connected in series and is connected with the comparison circuit through the buffer, the output end of the comparison circuit is connected with the R end of the RS trigger, the S end of the RS trigger is connected with a clock signal, and the positive and negative Q ends of the RS trigger are connected with the control circuit;
the control circuit comprises a first processor, a second processor and a third processor, wherein the first processor receives a signal at the positive Q end of the RS trigger, processes the signal and outputs the processed signal to the reference voltage regulating circuit and the first switch tube G1 or the second switch tube G2 on the primary side of the transformer; the second processor receives the signal of the reverse Q end of the RS trigger, processes the signal and outputs a control signal to the reverse oscillation circuit to perform oscillation reverse regulation;
the third processor receives the fault signal of the fault detection circuit, temporarily switches the control right of the first switch tube G1 or the second switch tube G2 to the third processor, and respectively controls the third switch tube G3, the fourth switch tube G4 and the fifth switch tube G5 according to the production control signal after signal processing.
The detection device, reference voltage regulator circuit connects at the rectifier circuit output, specifically includes: the resistor R1-R10, the transistor T1-T6 and the diode D1-D2, wherein the resistor R2 and the resistor R10 are adjustable resistors, the resistor R9 is a high-precision resistor, and the resistor R10 is a high-precision adjustable resistor; the adjustable resistors R2 and R10 receive the control of the control circuit and adjust the resistance value to adjust the output reference voltage.
In the detection device, one end of the resistor R1 is connected with the positive output end of the rectifying circuit, the other end of the resistor R1 is connected with one non-control end of the transistor T1, the other non-control end of the transistor T1 is connected with one end of the resistor R2, and the other end of the resistor R2 is grounded; one end of the resistor R3 is connected with one end of the resistor R1, the other end of the resistor R3 is connected with a non-control end of the transistor T2, and the other non-control end of the transistor T2 is grounded; one end of a resistor R4 is connected with one end of a resistor R3, the other end of a resistor R4 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with a non-control end of a transistor T3, the other non-control end of a transistor T3 is connected with a resistor R9, the other end of the resistor R9 is connected with a non-control end of a transistor T4, and the other non-control end of the transistor T4 is grounded through a diode D1 and the resistor R6; one end of the resistor R7 is connected with one end of the resistor R4, the other end of the resistor R7 is connected with a non-control end of the transistor T5, the other non-control end of the transistor T5 is connected with one end of the resistor R10, the other end of the resistor R10 is connected with a non-control end of the transistor T6, and the other non-control end of the transistor T6 is grounded through the diode D2 and the resistor R8;
the control terminal of the transistor T1 is connected to the other non-control terminal of the transistor T6, the control terminal of the transistor T2 is connected to a non-control terminal of the transistor T4, the control terminal of the transistor T3 is connected to the control terminal of the transistor T5, and the control terminal of the transistor T4 is connected to the control terminal of the transistor T6;
the transistor T3 and the transistor T5 are different types of transistors, the transistor T4 and the transistor T6 are different types of transistors, the transistor T3 and the transistor T6 are the same type of transistors, and the transistor T4 and the transistor T5 are the same type of transistors.
The third processor of the detection device comprises a third signal receiver, a third signal analyzer, a control right switch and a power supply switching controller; the third signal receiver is used for receiving a fault signal, and the third signal analyzer is used for analyzing and judging the fault signal; the control right switcher is used for temporarily switching the control right of the first switch tube G1 or the second switch tube G2 to the third processor after receiving the fault signal of the fault detection circuit, and temporarily switching the control right of the first switch tube G1 or the second switch tube G2 back to the first processor after the fault is eliminated or when the power supply is controlled through the second switch tube G2; the power supply switching controller is used for controlling the standby circuit to be powered on within the troubleshooting waiting time, and controlling the standby circuit to stop supplying power after the troubleshooting or when the power supply is controlled through the second switching tube G2.
A fault detection method for an LED power supply device comprises the detection device, and comprises the following steps:
s1) fault detection; the fault detection circuit is used for detecting the working state of a first switching tube G1, and when the first switching tube is detected to be in fault, a fault signal is sent to the control circuit;
s2) fault waiting for troubleshooting and waiting; after the control circuit receives the fault signal, a standby circuit is started to supply power, and meanwhile, fault troubleshooting waiting is started;
s3) determining whether the troubleshooting wait time is exceeded, and if so, proceeding to step S4), and if not, proceeding to step S6);
s4) the control circuit controls the second switch tube G2 to work and closes the standby circuit;
s5) detecting the output voltage to the LED, and performing initial reference voltage setting; the initial reference voltage setting comprises adjusting the resistance value of a resistor through a control circuit to control the output value of the reference voltage; detecting an oscillation peak value, and controlling and adjusting the working frequency of the first switching tube G1 after the detected oscillation peak value is compared with a frequency threshold value;
s6) detecting the output voltage to the LED, and performing initial reference voltage setting; the initial reference voltage setting comprises adjusting the resistance value of a resistor through a control circuit to control the output value of the reference voltage; and detecting an oscillation peak value, and controlling and adjusting the working frequency of the second switching tube G2 after comparing the detected oscillation peak value with a frequency threshold value.
In the method, the step S2) of starting the standby circuit to supply power specifically includes: controlling the fifth switch G5 to be continuously conducted, and supplying the electric energy of the super capacitor C4 to an LED lamp; the troubleshooting specifically comprises: the method comprises the steps of restarting the first switch tube three times continuously, detecting output voltage through an output voltage detection circuit respectively when restarting the first switch tube three times, judging whether the output voltage is recovered to be normal or not, connecting a standby circuit with one of a plurality of serially connected LEDs, if the output voltage is recovered to be normal, normally lighting the plurality of serially connected LEDs, adding a start again, if the output voltage is normal, continuing to use the first switch tube, if the output voltage is recovered to be normal, enabling the first switch tube to still work normally, namely when only one LED lamp is lighted, controlling the second switch tube to work by a control circuit, and starting an output voltage adjustment control program.
The beneficial technical effects obtained by the invention are as follows: the invention can rapidly carry out fault elimination on key devices of the LED power supply device, and avoids the error elimination of the fault, and the main improvement point of the invention is that the fault is restarted after the fault is detected, so that the error fault is prevented; the invention can ensure that the LEDs can keep supplying power during the fault period, and the brightness is displayed and distinguished according to the number of the LEDs, thereby being beneficial to troubleshooting and fault removal identification; as another main improvement point of the present invention, after the fault signal is generated or the fault is removed, the difference between the power supply voltage and the reference voltage can be adjusted rapidly, the frequency adjustment is performed, and the interference caused by the fault to the power supply device is reduced; the driving circuit of the invention can improve the quality of the electric energy output to the LED and greatly improve the stability of the LED operation, and can ensure that the power supply voltage is quickly stabilized to the voltage required by the LED during or after the fault through the regulation of the reference voltage and the reverse oscillation, and the power supply device can keep high-quality supply after the fault is removed.
Drawings
The invention will be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. In the drawings, like reference numerals designate corresponding parts throughout the different views.
Fig. 1 is a preferred schematic diagram of the fault detection device of the LED power supply device of the present invention.
Fig. 2 is a preferred schematic diagram of the fault detection method of the LED power supply device of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to embodiments thereof; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows.
The first embodiment is as follows:
fig. 1 shows a preferred schematic diagram of a fault detection device for an LED power supply device according to the present invention. The circuit comprises a fault detection circuit, a control circuit, a first switching tube, a second switching tube and a standby circuit; the fault detection circuit is used for detecting the working state of a first switch tube, when the first switch tube is detected to be in fault, a fault signal is sent to the control circuit, the control circuit receives the fault signal and then starts the standby circuit to supply power, meanwhile, the fault troubleshooting waiting is started, after the fault troubleshooting waiting time is exceeded, a second switch tube is controlled to start working, the standby circuit is closed, and the first switch tube and the second switch tube are connected in parallel.
The detection device, troubleshooting includes that the first switch tube is restarted three times in succession, when the three times are restarted, the output voltage is detected through the output voltage detection circuit respectively, whether the output voltage recovers to be normal is judged, the standby circuit is connected with one of the LEDs connected in series, if the output voltage recovers to be normal, the LEDs connected in series are all normally lighted, starting is added once again, if the output voltage is normal, the first switch tube is continuously used, and if the output voltage is restarted three times, the first switch tube still cannot normally work, namely when only one LED lamp is lighted, the control circuit controls the second switch tube to work and starts the output voltage adjustment control program.
The detection device also comprises a reference voltage regulating circuit and a reverse oscillation circuit; the enabling of the output voltage adjustment control routine includes enabling a regulating resistor of the reference voltage regulating circuit and enabling a counter oscillating circuit.
In the detection device, the first switch tube and the second switch tube are connected in parallel and then connected in series with a primary winding of a transformer; the standby circuit is connected with a secondary winding of the transformer in parallel, the standby circuit comprises a third switching tube G3, a fourth switching tube G4, a super capacitor C4 and a fifth switching tube G5, the third switching tube G3 and the fourth switching tube G4 form a half-bridge circuit to charge the super capacitor C4, the fifth switching tube G5 receives on-off control of the control circuit to achieve discharging and discharging stopping control, one end of the super capacitor C4 is connected with the anode of one of the LED strings through the fifth switching tube G5, and the other end of the super capacitor C4 is connected with the cathode of one of the LED strings.
The detection device is characterized in that the output voltage detection circuit comprises a high-precision voltage sensor, a buffer is arranged between the output voltage detection circuit and the comparison circuit, the buffer comprises at least one negative input end which is connected in series and is connected with the comparison circuit through the buffer, the output end of the comparison circuit is connected with the R end of the RS trigger, the S end of the RS trigger is connected with a clock signal, and the positive and negative Q ends of the RS trigger are connected with the control circuit;
the control circuit comprises a first processor, a second processor and a third processor, wherein the first processor receives a signal at the positive Q end of the RS trigger, processes the signal and outputs the processed signal to the reference voltage regulating circuit and the first switch tube G1 or the second switch tube G2 on the primary side of the transformer; the second processor receives the signal of the reverse Q end of the RS trigger, processes the signal and outputs a control signal to the reverse oscillation circuit to perform oscillation reverse regulation;
the third processor receives the fault signal of the fault detection circuit, temporarily switches the control right of the first switch tube G1 or the second switch tube G2 to the third processor, and respectively controls the third switch tube G3, the fourth switch tube G4 and the fifth switch tube G5 according to the production control signal after signal processing.
The detection device, reference voltage regulator circuit connects at the rectifier circuit output, specifically includes: the resistor R1-R10, the transistor T1-T6 and the diode D1-D2, wherein the resistor R2 and the resistor R10 are adjustable resistors, the resistor R9 is a high-precision resistor, and the resistor R10 is a high-precision adjustable resistor; the adjustable resistors R2 and R10 receive the control of the control circuit and adjust the resistance value to adjust the output reference voltage.
In the detection device, one end of the resistor R1 is connected with the positive output end of the rectifying circuit, the other end of the resistor R1 is connected with one non-control end of the transistor T1, the other non-control end of the transistor T1 is connected with one end of the resistor R2, and the other end of the resistor R2 is grounded; one end of the resistor R3 is connected with one end of the resistor R1, the other end of the resistor R3 is connected with a non-control end of the transistor T2, and the other non-control end of the transistor T2 is grounded; one end of a resistor R4 is connected with one end of a resistor R3, the other end of a resistor R4 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with a non-control end of a transistor T3, the other non-control end of a transistor T3 is connected with a resistor R9, the other end of the resistor R9 is connected with a non-control end of a transistor T4, and the other non-control end of the transistor T4 is grounded through a diode D1 and the resistor R6; one end of the resistor R7 is connected with one end of the resistor R4, the other end of the resistor R7 is connected with a non-control end of the transistor T5, the other non-control end of the transistor T5 is connected with one end of the resistor R10, the other end of the resistor R10 is connected with a non-control end of the transistor T6, and the other non-control end of the transistor T6 is grounded through the diode D2 and the resistor R8;
the control terminal of the transistor T1 is connected to the other non-control terminal of the transistor T6, the control terminal of the transistor T2 is connected to a non-control terminal of the transistor T4, the control terminal of the transistor T3 is connected to the control terminal of the transistor T5, and the control terminal of the transistor T4 is connected to the control terminal of the transistor T6;
the transistor T3 and the transistor T5 are different types of transistors, the transistor T4 and the transistor T6 are different types of transistors, the transistor T3 and the transistor T6 are the same type of transistors, and the transistor T4 and the transistor T5 are the same type of transistors.
The third processor of the detection device comprises a third signal receiver, a third signal analyzer, a control right switch and a power supply switching controller; the third signal receiver is used for receiving a fault signal, and the third signal analyzer is used for analyzing and judging the fault signal; the control right switcher is used for temporarily switching the control right of the first switch tube G1 or the second switch tube G2 to the third processor after receiving the fault signal of the fault detection circuit, and temporarily switching the control right of the first switch tube G1 or the second switch tube G2 back to the first processor after the fault is eliminated or when the power supply is controlled through the second switch tube G2; the power supply switching controller is used for controlling the standby circuit to be powered on within the troubleshooting waiting time, and controlling the standby circuit to stop supplying power after the troubleshooting or when the power supply is controlled through the second switching tube G2.
Fig. 2 is a preferred schematic diagram of a fault detection method for an LED power supply device. The detection device comprises the following steps:
s1) fault detection; the fault detection circuit is used for detecting the working state of a first switching tube G1, and when the first switching tube is detected to be in fault, a fault signal is sent to the control circuit;
s2) fault waiting for troubleshooting and waiting; after the control circuit receives the fault signal, a standby circuit is started to supply power, and meanwhile, fault troubleshooting waiting is started;
s3) determining whether the troubleshooting wait time is exceeded, and if so, proceeding to step S4), and if not, proceeding to step S6);
s4) the control circuit controls the second switch tube G2 to work and closes the standby circuit;
s5) detecting the output voltage to the LED, and performing initial reference voltage setting; the initial reference voltage setting comprises adjusting the resistance value of a resistor through a control circuit to control the output value of the reference voltage; detecting an oscillation peak value, and controlling and adjusting the working frequency of the first switching tube G1 after the detected oscillation peak value is compared with a frequency threshold value;
s6) detecting the output voltage to the LED, and performing initial reference voltage setting; the initial reference voltage setting comprises adjusting the resistance value of a resistor through a control circuit to control the output value of the reference voltage; and detecting an oscillation peak value, and controlling and adjusting the working frequency of the second switching tube G2 after comparing the detected oscillation peak value with a frequency threshold value.
In the method, the step S2) of starting the standby circuit to supply power specifically includes: controlling the fifth switch G5 to be continuously conducted, and supplying the electric energy of the super capacitor C4 to an LED lamp; the troubleshooting specifically comprises: the method comprises the steps of restarting the first switch tube three times continuously, detecting output voltage through an output voltage detection circuit respectively when restarting the first switch tube three times, judging whether the output voltage is recovered to be normal or not, connecting a standby circuit with one of a plurality of serially connected LEDs, if the output voltage is recovered to be normal, normally lighting the plurality of serially connected LEDs, adding a start again, if the output voltage is normal, continuing to use the first switch tube, if the output voltage is recovered to be normal, enabling the first switch tube to still work normally, namely when only one LED lamp is lighted, controlling the second switch tube to work by a control circuit, and starting an output voltage adjustment control program.
Example two:
the circuit comprises a control circuit, a first switch tube, a second switch tube and a standby circuit; the output voltage detection circuit detects the drop of the output voltage or the large fluctuation of the output voltage frequency, and the output voltage detection circuit is used for judging the fault of the first switching tube and determining a fault signal; the device comprises a control circuit, a standby circuit, a first switch tube, a second switch tube, a first switch tube and a second switch tube, wherein the standby circuit is used for detecting the working state of the first switch tube, when the first switch tube is detected to be in fault, the first switch tube sends a fault signal to the control circuit, the control circuit receives the fault signal and then starts the standby circuit to supply power, meanwhile, the standby circuit is started to wait for troubleshooting, when the standby.
The difference between this embodiment and the first embodiment is that a separate fault detection circuit is not needed, and only the output voltage detection circuit detects the frequency disorder to determine the fault of the first switching tube.
The invention can rapidly troubleshoot faults, reduce faulty operation, reduce the flash frequency of the LED and improve the lighting quality of the LED by controlling the output voltage quality after the faults are cleared, and the stability of the position power supply improves the service life of the LED.
The beneficial technical effects obtained by the invention are as follows: the invention can rapidly carry out fault elimination on key devices of the LED power supply device, and avoids the error elimination of the fault, and the main improvement point of the invention is that the fault is restarted after the fault is detected, so that the error fault is prevented; the invention can ensure that the LEDs can keep supplying power during the fault period, and the brightness is displayed and distinguished according to the number of the LEDs, thereby being beneficial to troubleshooting and fault removal identification; as another main improvement point of the present invention, after the fault signal is generated or the fault is removed, the difference between the power supply voltage and the reference voltage can be adjusted rapidly, the frequency adjustment is performed, and the interference caused by the fault to the power supply device is reduced; the driving circuit of the invention can improve the quality of the electric energy output to the LED and greatly improve the stability of the LED operation, and can ensure that the power supply voltage is quickly stabilized to the voltage required by the LED during or after the fault through the regulation of the reference voltage and the reverse oscillation, and the power supply device can keep high-quality supply after the fault is removed.
Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. It is therefore intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is the following claims, including all equivalents, that are intended to define the spirit and scope of this invention. The above examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (9)
1. The fault detection device of the LED power supply device is characterized by comprising a fault detection circuit, a control circuit, a first switch tube, a second switch tube and a standby circuit; the fault detection circuit is used for detecting the working state of a first switching tube, when the first switching tube is detected to be in fault, a fault signal is sent to the control circuit, the control circuit starts the standby circuit to supply power after receiving the fault signal, meanwhile, the fault troubleshooting waiting is started, when the troubleshooting waiting time is exceeded, a second switching tube is controlled to start working, the standby circuit is closed, and the first switching tube and the second switching tube are connected in parallel; the troubleshooting comprises the steps that the first switch tube is restarted three times continuously, when the first switch tube is restarted three times, the output voltage is detected through the output voltage detection circuit respectively, whether the output voltage is recovered to be normal or not is judged, the standby circuit is connected with one of the LEDs connected in series, if the output voltage is recovered to be normal, the LEDs connected in series are all normally lightened, starting is added again at the moment, if the output voltage is normal, the first switch tube is continuously used, if the output voltage is normal after the first switch tube is restarted three times, the first switch tube still cannot normally work, namely when only one LED lamp is lightened, the control circuit controls the second switch tube to work, and an output voltage adjustment control program is started.
2. The detection apparatus of claim 1, wherein the apparatus further comprises a reference voltage regulation circuit, a counter oscillating circuit; the enabling of the output voltage adjustment control routine includes enabling a regulating resistor of the reference voltage regulating circuit and enabling a counter oscillating circuit.
3. The detection device as claimed in claim 2, wherein the first switch tube and the second switch tube are connected in parallel and then connected in series with a primary winding of a transformer; the standby circuit is connected with a secondary winding of the transformer in parallel, the standby circuit comprises a third switching tube G3, a fourth switching tube G4, a super capacitor C4 and a fifth switching tube G5, the third switching tube G3 and the fourth switching tube G4 form a half-bridge circuit to charge the super capacitor C4, the fifth switching tube G5 receives on-off control of the control circuit to achieve discharging and discharging stopping control, one end of the super capacitor C4 is connected with the anode of one of the LED strings through the fifth switching tube G5, and the other end of the super capacitor C4 is connected with the cathode of one of the LED strings.
4. The detecting device for detecting the voltage of the motor rotor according to claim 3, wherein the output voltage detecting circuit comprises a high-precision voltage sensor, a buffer is further arranged between the output voltage detecting circuit and the comparison circuit, the buffer comprises at least one buffer which is connected in series, the negative input end of the comparison circuit is connected through the buffer, the output end of the comparison circuit is connected with the R end of the RS trigger, the S end of the RS trigger is connected with a clock signal, and the positive and negative Q ends of the RS trigger are connected with the control circuit;
the control circuit comprises a first processor, a second processor and a third processor, wherein the first processor receives a signal at the positive Q end of the RS trigger, processes the signal and outputs the processed signal to the reference voltage regulating circuit and the first switch tube G1 or the second switch tube G2 on the primary side of the transformer; the second processor receives the signal of the reverse Q end of the RS trigger, processes the signal and outputs a control signal to the reverse oscillation circuit to perform oscillation reverse regulation;
the third processor receives the fault signal of the fault detection circuit, temporarily switches the control right of the first switch tube G1 or the second switch tube G2 to the third processor, and respectively controls the third switch tube G3, the fourth switch tube G4 and the fifth switch tube G5 according to the production control signal after signal processing.
5. The detection apparatus according to claim 4, wherein the reference voltage adjusting circuit is connected to an output terminal of the rectifying circuit, and specifically comprises: the resistor R1-R10, the transistor T1-T6 and the diode D1-D2, wherein the resistor R2 and the resistor R10 are adjustable resistors, the resistor R9 is a high-precision resistor, and the resistor R10 is a high-precision adjustable resistor; the adjustable resistors R2 and R10 receive the control of the control circuit and adjust the resistance value to adjust the output reference voltage.
6. The detecting device according to claim 5, wherein one end of the resistor R1 is connected to the positive output end of the rectifying circuit, the other end is connected to a non-control end of the transistor T1, the other non-control end of the transistor T1 is connected to one end of the resistor R2, and the other end of the resistor R2 is grounded; one end of the resistor R3 is connected with one end of the resistor R1, the other end of the resistor R3 is connected with a non-control end of the transistor T2, and the other non-control end of the transistor T2 is grounded; one end of a resistor R4 is connected with one end of a resistor R3, the other end of a resistor R4 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with a non-control end of a transistor T3, the other non-control end of a transistor T3 is connected with a resistor R9, the other end of the resistor R9 is connected with a non-control end of a transistor T4, and the other non-control end of the transistor T4 is grounded through a diode D1 and the resistor R6; one end of the resistor R7 is connected with one end of the resistor R4, the other end of the resistor R7 is connected with a non-control end of the transistor T5, the other non-control end of the transistor T5 is connected with one end of the resistor R10, the other end of the resistor R10 is connected with a non-control end of the transistor T6, and the other non-control end of the transistor T6 is grounded through the diode D2 and the resistor R8;
the control terminal of the transistor T1 is connected to the other non-control terminal of the transistor T6, the control terminal of the transistor T2 is connected to a non-control terminal of the transistor T4, the control terminal of the transistor T3 is connected to the control terminal of the transistor T5, and the control terminal of the transistor T4 is connected to the control terminal of the transistor T6;
the transistor T3 and the transistor T5 are different types of transistors, the transistor T4 and the transistor T6 are different types of transistors, the transistor T3 and the transistor T6 are the same type of transistors, and the transistor T4 and the transistor T5 are the same type of transistors.
7. The detection apparatus of claim 6, wherein the third processor comprises a third signal receiver, a third signal analyzer, a control right switch, a power supply switching controller; the third signal receiver is used for receiving a fault signal, and the third signal analyzer is used for analyzing and judging the fault signal; the control right switcher is used for temporarily switching the control right of the first switch tube G1 or the second switch tube G2 to the third processor after receiving the fault signal of the fault detection circuit, and temporarily switching the control right of the first switch tube G1 or the second switch tube G2 back to the first processor after the fault is eliminated or when the power supply is controlled through the second switch tube G2; the power supply switching controller is used for controlling the standby circuit to be powered on within the troubleshooting waiting time, and controlling the standby circuit to stop supplying power after the troubleshooting or when the power supply is controlled through the second switching tube G2.
8. A method for detecting a failure of an LED power supply, comprising the detection device according to any one of claims 1 to 7, comprising the steps of:
s1) fault detection; the fault detection circuit is used for detecting the working state of a first switching tube G1, and when the first switching tube is detected to be in fault, a fault signal is sent to the control circuit;
s2) fault waiting for troubleshooting and waiting; after the control circuit receives the fault signal, a standby circuit is started to supply power, and meanwhile, fault troubleshooting waiting is started;
s3) determining whether the troubleshooting wait time is exceeded, and if so, proceeding to step S4), and if not, proceeding to step S6);
s4) the control circuit controls the second switch tube G2 to work and closes the standby circuit;
s5) detecting the output voltage to the LED, and performing initial reference voltage setting; the initial reference voltage setting comprises adjusting the resistance value of a resistor through a control circuit to control the output value of the reference voltage; detecting an oscillation peak value, and controlling and adjusting the working frequency of the first switching tube G1 after the detected oscillation peak value is compared with a frequency threshold value;
s6) detecting the output voltage to the LED, and performing initial reference voltage setting; the initial reference voltage setting comprises adjusting the resistance value of a resistor through a control circuit to control the output value of the reference voltage; and detecting an oscillation peak value, and controlling and adjusting the working frequency of the second switching tube G2 after comparing the detected oscillation peak value with a frequency threshold value.
9. The method as claimed in claim 8, wherein the step S2) of activating the standby circuit to supply power specifically includes: controlling the fifth switch G5 to be continuously conducted, and supplying the electric energy of the super capacitor C4 to an LED lamp; the troubleshooting specifically comprises: the method comprises the steps of restarting the first switch tube three times continuously, detecting output voltage through an output voltage detection circuit respectively when restarting the first switch tube three times, judging whether the output voltage is recovered to be normal or not, connecting a standby circuit with one of a plurality of serially connected LEDs, if the output voltage is recovered to be normal, normally lighting the plurality of serially connected LEDs, adding a start again, if the output voltage is normal, continuing to use the first switch tube, if the output voltage is recovered to be normal, enabling the first switch tube to still work normally, namely when only one LED lamp is lighted, controlling the second switch tube to work by a control circuit, and starting an output voltage adjustment control program.
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| WO1982003137A1 (en) * | 1981-03-11 | 1982-09-16 | Ncr Co | Power supply diagnostic system |
| EP2189798A2 (en) * | 2008-11-25 | 2010-05-26 | NEC Microwave Tube, Ltd. | Current measuring circuit |
| CN206096409U (en) * | 2016-10-28 | 2017-04-12 | 深圳市莱福德光电有限公司 | LED drive power supply testing arrangement |
| CN107367700A (en) * | 2016-05-11 | 2017-11-21 | 美芯晟科技（北京）有限公司 | The detection circuit and detection method of a kind of LED switch power supply |
| CN206990771U (en) * | 2017-06-15 | 2018-02-09 | 广东上普壹明实业有限公司 | A kind of LED power supplies failure detector |
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2018
- 2018-09-26 CN CN201811118253.3A patent/CN109085453B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1982003137A1 (en) * | 1981-03-11 | 1982-09-16 | Ncr Co | Power supply diagnostic system |
| EP2189798A2 (en) * | 2008-11-25 | 2010-05-26 | NEC Microwave Tube, Ltd. | Current measuring circuit |
| CN107367700A (en) * | 2016-05-11 | 2017-11-21 | 美芯晟科技（北京）有限公司 | The detection circuit and detection method of a kind of LED switch power supply |
| CN206096409U (en) * | 2016-10-28 | 2017-04-12 | 深圳市莱福德光电有限公司 | LED drive power supply testing arrangement |
| CN206990771U (en) * | 2017-06-15 | 2018-02-09 | 广东上普壹明实业有限公司 | A kind of LED power supplies failure detector |
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