CN101340762A - Lamp tube detection driving system and related detection driving method - Google Patents
Lamp tube detection driving system and related detection driving method Download PDFInfo
- Publication number
- CN101340762A CN101340762A CNA200810144960XA CN200810144960A CN101340762A CN 101340762 A CN101340762 A CN 101340762A CN A200810144960X A CNA200810144960X A CN A200810144960XA CN 200810144960 A CN200810144960 A CN 200810144960A CN 101340762 A CN101340762 A CN 101340762A
- Authority
- CN
- China
- Prior art keywords
- signal
- fluorescent tube
- reference signal
- detection
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention provides a lamp tube detection driving system which can carry out adaptive lamp tube driving and corresponding detection operations according to parameter compounds. The system comprises a micro-controller, a driver, a defect detection module and a feedback circuit; the micro-controller provides a modulation signal and a plurality of reference signals according to the parameter compounds; the driver generates at least one driving signal according to the modulation signals so as to drive at least one lamp tube; the feedback circuit generates a plurality of feedback signals according to the lamp tube current of the lamp tube voltage; the defect detection module generates a plurality of detection signals according to a plurality of reference signals and a plurality of feedback signals. The invention also discloses a lamp tube driving method, comprising the steps as follows: the parameter compounds are downloaded, at least one driving signal is generated according to the parameter compounds so as to drive at least a lamp tube; according to the parameter compounds, at least a reference signal is provided so as to carry out the defect detection program. The system and the method of the invention can carry out the adaptive lamp tube driving and corresponding detection operations, so as to reduce the detection cost and improve the detection efficiency.
Description
Technical field
The present invention relates to a kind of fluorescent tube and detect drive system and coherent detection driving method, relate in particular to a kind of fluorescent tube detection drive system and the coherent detection driving method that can carry out driving of adaptability fluorescent tube and coherent detection operation according to parameter prescription (Recipe).
Background technology
(Liquid Crystal Display LCD) is present widely used a kind of flat-panel screens to liquid crystal indicator, and it has, and external form is frivolous, power saving and advantage such as radiationless.The voltage difference that the operation principle utilization of liquid crystal indicator changes the liquid crystal layer two ends changes the ordered state of the liquid crystal molecule in the liquid crystal layer, in order to change the light transmission of liquid crystal layer, to cooperate light source module again the light source that provided with show image.
Generally speaking, the light source module of liquid crystal indicator is below or the side that is arranged at display panels, cooperate various optical elements (as diffuser plate, prism etc.) so that display panels high brightness and uniform light source to be provided, again by the pixel electrode of control on the display panels to form suitable color and intensification modulation, in order to show various beautiful images.Light source module comprises at least one fluorescent tube, this fluorescent tube can be cold cathode fluorescent lamp (Cold-Cathode Fluorescent Lamp, CCFL) or the external electrode fluorescent tube (ExternalElectrode Fluorescent Lamp, EEFL).Because the lamp works usefulness of light source module can directly have influence on the image display quality of liquid crystal indicator, so on the production line of light source module, fluorescent tube detects the key procedure that is the element screening.
From the above, fluorescent tube detection drive system in order to the detection light source module is directly connected to the efficient of production line and the quality that product are protected, yet because of the factors such as fluorescent tube size, fluorescent tube quantity, fluorescent tube driving frequency or fluorescent tube drive current of variety classes light source module may be different, for example light source module may comprise a fluorescent tube, two fluorescent tubes, four fluorescent tubes or more fluorescent tubes, so will use the variety classes fluorescent tube to detect drive system to carry out the trace routine of light source module.In other words, each light source module all needs exclusive fluorescent tube to detect drive system to carry out coherent detection, thus, trace routine will often be changed different types of exclusive fluorescent tube and detect drive system, to detect different types of light source module, so the risk of misoperation also improves relatively, thereby cause high detection cost and low detection efficiency.
Summary of the invention
For overcoming the defective of prior art, according to embodiments of the invention, it discloses a kind of fluorescent tube and detects drive system, and the adaptability fluorescent tube drives and the coherent detection operation in order to carry out.This kind fluorescent tube detects drive system and comprises micro controller unit, driving signal control circuit, a plurality of drive circuit, defects detection module and feedback circuit.Micro controller unit is in order to provide pulse width modulation signal, lamp current control signal and a plurality of reference signal detection according to parameter prescription (Recipe).Driving signal control circuit is coupled in micro controller unit, in order to produce a plurality of prime control signals according to the pulse width modulation signal.Each drive circuit is coupled in driving signal control circuit, is used for producing drive signal to drive corresponding fluorescent tube according to a plurality of prime control signals.The defects detection module is coupled in micro controller unit to receive a plurality of reference signal detection, in order to produce a plurality of detection signals according to a plurality of reference signal detection and a plurality of feedback signal.Feedback circuit is coupled in defect detection circuit, produces a plurality of feedback signals in order at least one lamp current or at least one light tube electric voltage according at least one fluorescent tube.
According to embodiments of the invention, it discloses a kind of fluorescent tube in addition and detects driving method, and the adaptability fluorescent tube drives and the coherent detection operation in order to carry out.This fluorescent tube detects driving method and comprises: download the parameter prescription; Produce at least one drive signal to drive at least one fluorescent tube according to the parameter prescription; And provide at least one reference signal detection to carry out at least one defects detection program according to the parameter prescription.
Detect that drive system can carry out that the adaptability fluorescent tube drives and the coherent detection operation detects cost and improves detection efficiency reducing according to fluorescent tube according to the present invention.
Description of drawings
Fig. 1 detects the schematic diagram of drive system for the first embodiment of the invention fluorescent tube.
Fig. 2 is the internal structure schematic diagram of the drive circuit of Fig. 1.
Fig. 3 (a) drives the first embodiment circuit diagram of shut-off circuit for fluorescent tube.
Fig. 3 (b) drives the second embodiment circuit diagram of shut-off circuit for fluorescent tube.
Fig. 3 (c) drives the 3rd embodiment circuit diagram of shut-off circuit for fluorescent tube.
Fig. 3 (d) drives the 4th embodiment circuit diagram of shut-off circuit for fluorescent tube.
Fig. 4 is the preferred embodiment circuit diagram of the open detection circuit of Fig. 1.
Fig. 5 is the preferred embodiment circuit diagram of the connectivity port reversal connection testing circuit of Fig. 1.
Fig. 6 is the preferred embodiment circuit diagram of the short-circuit detecting circuit of Fig. 1.
Fig. 7 is the preferred embodiment circuit diagram of the lamp tube current balance testing circuit of Fig. 1.
Fig. 8 detects the schematic diagram of drive system for the second embodiment of the invention fluorescent tube.
Fig. 9 is that the fluorescent tube that is used for the fluorescent tube detection drive system of Fig. 1 detects the driving method flow chart.
Wherein, description of reference numerals is as follows:
System's 200,900 fluorescent tubes detect and drive
201,901 light source modules
205,905 fluorescent tubes
210,910 transformers
270,970 defects detection modules
203,903 exclusive power supplys
204,904 common sources
215,915 connectivity ports
220,920 drive circuits
225,925 driving signal control circuits
230,930 feedback circuits
235,935 and walk to the serial transmission transducer
240,940 first digital to analog converters
245,945 second digital to analog converters
250,950 micro controller units
252,952 nonvolatile memories
255,955 flag registers
260,960 coffrets
280,980 defect detection units
281,981 open detection circuit
283,983 connectivity port reversal connection testing circuits
285,985 short-circuit detecting circuits
287,987 lamp tube current balance testing circuits
321 prime drivers
322 transducers
323,410,420,430,440 fluorescent tubes drive shut-off circuit
411,421,431,441 first pull-down diode
412,422,432,442 second pull-down diode
429,439,449 switches
433,443 the 3rd pull-down diode
434,444 the 4th pull-down diode
445 the 5th pull-down diode
446 the 6th pull-down diode
571,673,771 comparators
675 operational amplifiers
671 difference channels
681 first input ends
682 second inputs
683 outputs
685,686,687,688 resistance
871 first comparators
873 second comparators
875 logical AND gates
989 multiplexer modules
990 fluorescent tubes detect driving method
The D1 first prime control signal
The D2 second prime control signal
S1, S2, S3, S4 drive control signal
The S901-S847 step
Sbal lamp tube current balance detection signal
The Sd drive signal
The Sdiff difference signal
S
FB_1, S
FB_2-S
FB_NFeedback signal
SI lamp current signal
SIb fluorescent tube rear end current signal
SIf fluorescent tube front end current signal
SIref fluorescent tube open circuit reference signal
The high current reference signal of SIref1
SIref2 low current reference signal
S
LK_1, S
LK_2-S
LK_NShutdown signal
Sinv reversal connection detection signal
The Sopen detection signal of opening a way
Srefinv reversal connection reference signal detection
The Sshort short-circuit detection signal
Terminal voltage signal before the SVh fluorescent tube
The SVref voltage reference signal
Embodiment
For making the present invention more apparent and understandable, hereinafter detect drive system and coherent detection driving method according to fluorescent tube of the present invention, elaborate especially exemplified by the embodiment conjunction with figs., but the scope that the embodiment that is provided is not contained in order to restriction the present invention, carry out precedence and the method flow number of steps is more non-in order to limit it, any execution flow process that is reconfigured by method step is produced the method with impartial effect, is all the scope that the present invention is contained.
Fig. 1 detects the schematic diagram of drive system for the first embodiment of the invention fluorescent tube.As shown in Figure 1, fluorescent tube detects drive system 200 and has the light source module 201 of at least one fluorescent tube 205 in order to detection, and fluorescent tube 205 is cold cathode fluorescent lamp or external electrode fluorescent tube.Fluorescent tube detects drive system 200 and comprises micro controller unit 250, driving signal control circuit 225, a plurality of drive circuit 220, a plurality of transformer 210, a plurality of connectivity port 215, coffret 260, first digital to analog converter 240, second digital to analog converter 245, feedback circuit 230 and walk to serial transmission transducer 235 and defects detection module 270.Micro controller unit 250 comprises nonvolatile memory 252 and flag register 255.Nonvolatile memory 252 be electrical Erasable Programmable Read Only Memory EPROM (Electrically Erasable Programmable ReadOnly Memory, EEPROM) or flash memory (Flash Memory).Defects detection module 270 comprises a plurality of defect detection units 280, and each defect detection unit 280 comprises open detection circuit 281, connectivity port reversal connection testing circuit 283, short-circuit detecting circuit 285, reaches lamp tube current balance testing circuit 287.
Micro controller unit 250 is coupled in coffret 260, coffret 260 can be (Inter-Integrated circuit between integrated circuit (IC) chip, I2C) coffret or general asynchronous receiving-transmitting transmitter (Universal Asynchronous Receiver/Transmitter, UART), in order to from the I2C transmission line or and other associated transport lines download parameter prescriptions, and stored parameter is filled a prescription in nonvolatile memory 252.Micro controller unit 250 can produce pulse width modulation signal, a plurality of reference signal detection and lamp current control signal according to the parameter prescription, can change flag value and a plurality of shutdown signal SLK_1 of activation, the SLK_2-SLK_N of flag register 255 in addition when detecting defective.Micro controller unit 250 can be set according to the parameter prescription in addition and light a lamp stabilization time, in order to carry out delay routine in testing process.In addition, the parameter prescription can couple the fluorescent tube number in order to setting, and micro controller unit 250 can couple the fluorescent tube number and the normal fluorescent tube number that detects according to what set, and has judged whether the fluorescent tube open circuit defect.The flag register 255 of micro controller unit 250 can judge whether that in order to store corresponding flag value at detected state defectiveness is detected according to the flag value of flag register 255.In one embodiment, micro controller unit 250 is driven by exclusive power supply 203, and all the other elements that fluorescent tube detects drive system 200 are then driven by common source 204.In another embodiment, micro controller unit 250 can drive by common source 204 with all the other elements that fluorescent tube detects drive system 200.First digital to analog converter 240 is coupled in micro controller unit 250 with receiving light tube current control signal, and the lamp current control signal is converted to analog control signal.Micro controller unit 250 can be sent to first digital to analog converter 240 with the lamp current control signal by coffret such as coffret or general asynchronous receiving-transmitting transmitter between integrated circuit (IC) chip.Driving signal control circuit 225 is coupled in the micro controller unit 250 and first digital to analog converter 240, in order to respectively received pulse width modulation signal and analog control signal, and produce the first prime control signal D1 and the second prime control signal D2 according to pulse width modulation signal and analog control signal.
Each drive circuit 220 all is coupled in driving signal control circuit 225 receiving the first prime control signal D1 and the second prime control signal D2, and produces corresponding drive signal according to the first prime control signal D1 and the second prime control signal D2.Each drive circuit 220 is coupled in micro controller unit 250 in addition to receive corresponding shutdown signal, in order to operate according to corresponding shutdown signal shut-off circuit.Each transformer 210 is coupled in corresponding drive circuit 220 receiving corresponding drive signal, and corresponding drive signal is converted to corresponding high-voltage driven signal, in order to drive corresponding fluorescent tube 205.Each connectivity port 215 is coupled in corresponding transformer 210, is used for exporting corresponding high-voltage driven signal to drive the corresponding fluorescent tube 205 that has coupled.
Feedback circuit 230 is coupled in a plurality of connectivity ports 215, in order to produce many group feedback signal SFB_1, SFB_2-SFB_N according to a plurality of lamp currents and a plurality of light tube electric voltage, each group feedback signal can comprise the preceding terminal voltage signal of fluorescent tube front end current signal, fluorescent tube rear end current signal and fluorescent tube of corresponding fluorescent tube.Second digital to analog converter 245 is coupled between micro controller unit 250 and the defects detection module 270, and in order to a plurality of reference signal detection are converted to a plurality of analog, promptly a plurality of analog all can be adjusted according to the parameter prescription.A plurality of analog can comprise fluorescent tube open circuit reference signal, high current reference signal, low current reference signal, voltage reference signal, reach the reversal connection reference signal detection.Defects detection module 270 is coupled in feedback circuit 230 to receive many group feedback signal SFB_1, SFB_2-SFB_N, other is coupled in second digital to analog converter 245 to receive a plurality of analog, and each defect detection unit 280 is carried out the trace routine of corresponding fluorescent tube to produce a plurality of corresponding detection signals according to a plurality of corresponding feedback signals and a plurality of analog.And walk to serial transmission transducer 235 and be coupled between defects detection module 270 and the micro controller unit 250, be sent to micro controller unit 250 in order to being converted to the serial output signal from a plurality of detection signals of defects detection module 270 parallel inputs.In another embodiment, and walk to serial transmission transducer 235 and can omit, and a plurality of detection signals of defects detection module 270 and line output directly are fed into micro controller unit 250.
Fig. 2 is the internal structure schematic diagram of the drive circuit of Fig. 1.As shown in Figure 2, drive circuit 220 comprises prime driver 321, transducer 322, reaches fluorescent tube driving shut-off circuit 323.Prime driver 321 is coupled in driving signal control circuit 225 receiving the first prime control signal D1 and the second prime control signal D2, and produces a plurality of drive control signal S1-S4 according to the first prime control signal D1 and the second prime control signal D2.Transducer 322 is coupled in prime driver 321, and in order to produce drive signal Sd according to a plurality of drive control signal S1-S4, drive signal Sd is fed into corresponding transformer 210 and drives corresponding fluorescent tube 205 to produce corresponding high-voltage driven signal.Transducer 322 is full-bridge current device, semi-bridge converter device or push-pull type converter.Fluorescent tube drives shut-off circuit 323 and is coupled in micro controller unit 250 to receive corresponding shutdown signal SLK, and the first prime control signal D1 and the second prime control signal D2 are pulled down to earth level, and/or a plurality of drive control signal S1-S4 are pulled down to earth level according to corresponding shutdown signal SLK.
The first embodiment internal circuit configuration that the fluorescent tube of Fig. 2 drives shut-off circuit 323 is that the fluorescent tube shown in Fig. 3 (a) drives shut-off circuit 410.Please refer to Fig. 3 (a), Fig. 3 (a) drives the first embodiment circuit diagram of shut-off circuit for fluorescent tube.Shown in Fig. 3 (a), fluorescent tube drives shut-off circuit 410 and comprises first pull-down diode 411 and second pull-down diode 412.The anode of first pull-down diode 411 is coupled in driving signal control circuit 225 to receive the first prime control signal D1, the anode of second pull-down diode 412 is coupled in driving signal control circuit 225 to receive the second prime control signal D2, and the negative terminal of the negative terminal of first pull-down diode 411 and second pull-down diode 412 all is coupled in micro controller unit 250 to receive corresponding shutdown signal SLK.So when corresponding shutdown signal SLK is low level, the first prime control signal D1 and the second prime control signal D2 can be respectively via first pull-down diode 411 and second pull-down diode 412 and be pulled down to low level.
The second embodiment internal circuit configuration that the fluorescent tube of Fig. 2 drives shut-off circuit 323 is that the fluorescent tube shown in Fig. 3 (b) drives shut-off circuit 420.Please refer to Fig. 3 (b), Fig. 3 (b) drives the second embodiment circuit diagram of shut-off circuit for fluorescent tube.Shown in Fig. 3 (b), fluorescent tube drives shut-off circuit 420 and comprises first pull-down diode 421, second pull-down diode 422, reaches switch 429.The anode of first pull-down diode 421 is coupled in driving signal control circuit 225 to receive the first prime control signal D1, and the anode of second pull-down diode 422 is coupled in driving signal control circuit 225 to receive the second prime control signal D2.Switch 429 comprises first end, second end, reaches control end, wherein first end is coupled in the negative terminal of first pull-down diode 421 and the negative terminal of second pull-down diode 422, second end is coupled in earth terminal, and control end is coupled in micro controller unit 250 to receive corresponding shutdown signal SLK.So when corresponding shutdown signal SLK is the conducting enable signal of switch 429, the first prime control signal D1 and the second prime control signal D2 can be respectively via first pull-down diode 421 and second pull-down diode 422 and be pulled down to earth level.Switch 429 can be mos field effect transistor (Metal-Oxide-Semiconductor Field Effect Transistor), junction field effect transistor (Junction Field Effect Transistor) or bipolar junction transistor (Bipolar JunctionTransistor), and the conducting enable signal can be high level enable signal or low level enable signal.
The 3rd embodiment internal circuit configuration that the fluorescent tube of Fig. 2 drives shut-off circuit 323 is that the fluorescent tube shown in Fig. 3 (c) drives shut-off circuit 430.Please refer to Fig. 3 (c), Fig. 3 (c) drives the 3rd embodiment circuit diagram of shut-off circuit for fluorescent tube.Shown in Fig. 3 (c), fluorescent tube drives shut-off circuit 430 and comprises first pull-down diode 431, second pull-down diode 432, the 3rd pull-down diode 433, the 4th pull-down diode 434, reaches switch 439.The anode of first pull-down diode 431 is coupled in prime driver 321 to receive drive control signal S1, the anode of second pull-down diode 432 is coupled in prime driver 321 to receive drive control signal S2, the anode of the 3rd pull-down diode 433 is coupled in prime driver 321 to receive drive control signal S3, and the anode of the 4th pull-down diode 434 is coupled in prime driver 321 to receive drive control signal S4.Switch 439 comprises first end, second end, reaches control end, wherein first end is coupled in negative terminal, and the negative terminal of the 4th pull-down diode 434 of negative terminal, the 3rd pull-down diode 433 of negative terminal, second pull-down diode 432 of first pull-down diode 431, second end is coupled in earth terminal, and control end is coupled in micro controller unit 250 to receive corresponding shutdown signal SLK.So when corresponding shutdown signal SLK is the conducting enable signal of switch 439, a plurality of drive control signal S1-S4 can be respectively via first pull-down diode 431, second pull-down diode 432, the 3rd pull-down diode 433, and the 4th pull-down diode 434 and be pulled down to earth level.Switch 439 can be mos field effect transistor, junction field effect transistor or bipolar junction transistor, and the conducting enable signal can be high level enable signal or low level enable signal.
The 4th embodiment internal circuit configuration that the fluorescent tube of Fig. 2 drives shut-off circuit 323 is that the fluorescent tube shown in Fig. 3 (d) drives shut-off circuit 440.Please refer to Fig. 3 (d), Fig. 3 (d) drives the 4th embodiment circuit diagram of shut-off circuit for fluorescent tube.Shown in Fig. 3 (d), fluorescent tube drives shut-off circuit 440 and comprises first pull-down diode 441, second pull-down diode 442, the 3rd pull-down diode 443, the 4th pull-down diode 444, the 5th pull-down diode 445, the 6th pull-down diode 446, reaches switch 449.The anode of first pull-down diode 441 is coupled in driving signal control circuit 225 to receive the first prime control signal D1, the anode of second pull-down diode 442 is coupled in driving signal control circuit 225 to receive the second prime control signal D2, the anode of the 3rd pull-down diode 443 is coupled in prime driver 321 to receive drive control signal S1, the anode of the 4th pull-down diode 444 is coupled in prime driver 321 to receive drive control signal S2, the anode of the 5th pull-down diode 445 is coupled in prime driver 321 to receive drive control signal S3, and the anode of the 6th pull-down diode 446 is coupled in prime driver 321 to receive drive control signal S4.Switch 449 comprises first end, second end, reaches control end, wherein first end is coupled in negative terminal, and the negative terminal of the 6th pull-down diode 446 of negative terminal, the 5th pull-down diode 445 of negative terminal, the 4th pull-down diode 444 of negative terminal, the 3rd pull-down diode 443 of negative terminal, second pull-down diode 442 of first pull-down diode 441, second end is coupled in earth terminal, and control end is coupled in micro controller unit 250 to receive corresponding shutdown signal SLK.So when corresponding shutdown signal SLK is the conducting enable signal of switch 449, the first prime control signal D1, the second prime control signal D2, and a plurality of drive control signal S1-S4 can be respectively via first pull-down diode 441, second pull-down diode 442, the 3rd pull-down diode 443, the 4th pull-down diode 444, the 5th pull-down diode 445, and the 6th pull-down diode 446 and be pulled down to earth level.Switch 449 can be mos field effect transistor, junction field effect transistor or bipolar junction transistor, and the conducting enable signal can be high level enable signal or low level enable signal.
Fig. 4 is the preferred embodiment circuit diagram of the open detection circuit of Fig. 1.As shown in Figure 4, open detection circuit 281 comprises comparator 571.Comparator 571 comprises positive input terminal, negative input end, reaches output, wherein positive input terminal is in order to receive the corresponding lamp current signal SI of 230 feed-ins of feedback circuit, negative input end is in order to receiving light tube open circuit reference signal SIref, and output is in order to output open circuit detection signal Sopen.Lamp current signal SI can be fluorescent tube front end current signal or fluorescent tube rear end current signal.Fluorescent tube open circuit reference signal SIref is a current reference signal decided at the higher level but not officially announced, or the current reference signal for setting according to the parameter prescription.So when the open circuit detection signal Sopen of open detection circuit 281 output low levels, then expression detects the open circuit defect of corresponding fluorescent tube 205, or represents that corresponding connectivity port 215 does not couple fluorescent tube.In another embodiment, the positive input terminal of comparator 571 is in order to receiving light tube open circuit reference signal SIref, and the negative input end of comparator 571 is in order to receive the corresponding lamp current signal SI of 230 feed-ins of feedback circuit, like this then when the open circuit detection signal Sopen of open detection circuit 281 output high level, just expression detects the open circuit defect of corresponding fluorescent tube 205, or represents that corresponding connectivity port 215 does not couple fluorescent tube.Please note, no matter be the open circuit defect that detects corresponding fluorescent tube 205, or detecting corresponding connectivity port 215 does not couple fluorescent tube, micro controller unit 250 all can be exported corresponding shutdown signal immediately to stop corresponding connectivity port 215 output high-voltage driven signals, in order to guarantee testing staff's handling safety.
Fig. 5 is the preferred embodiment circuit diagram of the connectivity port reversal connection testing circuit of Fig. 1.As shown in Figure 5, connectivity port reversal connection testing circuit 283 comprises difference channel 671 and comparator 673.Difference channel 671 comprises first input end 681, second input 682, output 683, a plurality of resistance 685-688, and operational amplifier 675, wherein first input end 681 is in order to receive the corresponding fluorescent tube front end current signal SIf of 230 feed-ins of feedback circuit, second input 682 is in order to receive the corresponding fluorescent tube rear end current signal SIb of 230 feed-ins of feedback circuit, and output is in order to output difference signal Sdiff.A plurality of resistance 685-688 and operational amplifier 675 are combined as known subtraction circuit.The positive input terminal of operational amplifier 675 is coupled in first input end 681, the negative input end of operational amplifier 675 is coupled in second input 682, so difference channel 671 is used for fluorescent tube front end current signal SIf is deducted fluorescent tube rear end current signal SIb to produce difference signal Sdiff.In another embodiment, difference channel 671 is known instrument differential amplifier (Instrumentation Differential Amplifier).Comparator 673 comprises positive input terminal, negative input end, reaches output, wherein positive input terminal is in order to receive reversal connection reference signal detection Srefinv, negative input end is coupled in the output 683 of difference channel 671 to receive difference signal Sdiff, and output is in order to output reversal connection detection signal Sinv.Reversal connection reference signal detection Srefinv is a reversal connection reference signal detection decided at the higher level but not officially announced, or the reversal connection reference signal detection for setting according to the parameter prescription.So when the reversal connection detection signal Sinv of connectivity port reversal connection testing circuit 283 output low levels, then expression detects connectivity port reversal connection situation.In one embodiment, the positive input terminal of comparator 673 is coupled in the output 683 of difference channel 671 to receive difference signal Sdiff, and the negative input end of comparator 673 is in order to receive reversal connection reference signal detection Srefinv, like this then when the reversal connection detection signal Sinv of connectivity port reversal connection testing circuit 283 output high level, just represent to detect connectivity port reversal connection situation.
Fig. 6 is the preferred embodiment circuit diagram of the short-circuit detecting circuit of Fig. 1.As shown in Figure 6, short-circuit detecting circuit 285 comprises comparator 771.Comparator 771 comprises positive input terminal, negative input end, reaches output, wherein positive input terminal in order to the corresponding fluorescent tube that receives 230 feed-ins of feedback circuit before terminal voltage signal SVh, negative input end is in order to receive voltage reference signal SVref, and output is in order to output short-circuit detection signal Sshort.Voltage reference signal SVref is a voltage reference signal decided at the higher level but not officially announced, or the voltage reference signal for setting according to the parameter prescription.So when the short-circuit detection signal Sshort of short-circuit detecting circuit 285 output low levels, then expression detects the circuit defect of corresponding fluorescent tube 205.In another embodiment, the positive input terminal of comparator 771 is in order to receive voltage reference signal SVref, and the negative input end of comparator 771 in order to the corresponding fluorescent tube that receives 230 feed-ins of feedback circuit before terminal voltage signal SVh, like this then when the short-circuit detection signal Sshort of short-circuit detecting circuit 285 output high level, just represent to detect the circuit defect of corresponding fluorescent tube 205.
Fig. 7 is the preferred embodiment circuit diagram of the lamp tube current balance testing circuit of Fig. 1.As shown in Figure 7, lamp tube current balance testing circuit 287 comprises first comparator 871, second comparator 873, reaches logical AND gate 875.First comparator 871 comprises positive input terminal, negative input end, reaches output, and wherein positive input terminal is in order to receive high current reference signal SIref1, and negative input end is in order to receive corresponding fluorescent tube rear end current signal Sib or fluorescent tube front end current signal SIf.High current reference signal SIref1 is a high current reference signal decided at the higher level but not officially announced, or the high current reference signal for setting according to the parameter prescription.Second comparator 873 comprises positive input terminal, negative input end, reaches output, and wherein negative input end is in order to receive low current reference signal SIref2, and positive input terminal is in order to receive corresponding fluorescent tube rear end current signal SIb.Low current reference signal SIref2 is a low current reference signal decided at the higher level but not officially announced, or the low current reference signal for setting according to the parameter prescription.Logical AND gate 875 comprises first input end, second input, reaches output, wherein first input end is coupled in the output of first comparator 871, second input is coupled in the output of second comparator 873, and output is in order to output lamp tube current balance detection signal Sbal.So when the signal value of corresponding fluorescent tube rear end current signal SIb or fluorescent tube front end current signal SIf is between the signal value of the signal value of high current reference signal SIref1 and low current reference signal SIref2, the lamp tube current balance detection signal Sbal of lamp tube current balance testing circuit 287 output high level is to work in the current balance type situation in order to represent corresponding fluorescent tube.Otherwise, when the lamp tube current balance detection signal Sbal of lamp tube current balance testing circuit 287 output low levels, represent that then corresponding fluorescent tube is the current unbalance situation that works in, this current unbalance situation may be that the slight crack by corresponding fluorescent tube 205 is caused.
Fig. 8 detects the schematic diagram of drive system for the second embodiment of the invention fluorescent tube.As shown in Figure 8, fluorescent tube detects drive system 900 and has the light source module 901 of at least one fluorescent tube 905 in order to detection, and fluorescent tube 905 is cold cathode fluorescent lamp or external electrode fluorescent tube.Fluorescent tube detects drive system 900 and comprises micro controller unit 950, driving signal control circuit 925, a plurality of drive circuit 920, a plurality of transformer 910, a plurality of connectivity port 915, coffret 960, first digital to analog converter 940, second digital to analog converter 945, feedback circuit 930 and walk to serial transmission transducer 935 and defects detection module 970.Micro controller unit 950 comprises nonvolatile memory 952 and flag register 955.Nonvolatile memory 952 is electrical Erasable Programmable Read Only Memory EPROM or flash memory.Defects detection module 970 comprises defect detection unit 980 and multiplexer module 989, and defect detection unit 980 comprises open detection circuit 981, connectivity port reversal connection testing circuit 983, short-circuit detecting circuit 985, reaches lamp tube current balance testing circuit 987.
Micro controller unit 950 is coupled in coffret 960, coffret 960 can be I2C coffret or general asynchronous receiving-transmitting transmitter, in order to from the I2C transmission line or and other associated transport lines download parameter prescriptions, and stored parameter is filled a prescription in nonvolatile memory 952.Micro controller unit 950 can produce pulse width modulation signal, a plurality of reference signal detection and lamp current control signal according to the parameter prescription, and can change the flag value of flag register 955 when detecting defective and produce a plurality of shutdown signal SLK_1, SLK_2-SLK_N.Micro controller unit 950 can be set according to the parameter prescription in addition and light a lamp stabilization time, in order to carry out delay routine in testing process.In addition, the parameter prescription can couple the fluorescent tube number in order to setting, and micro controller unit 950 can couple the fluorescent tube number and the normal fluorescent tube number that detects according to what set, and has judged whether the fluorescent tube open circuit defect.The flag register 955 of micro controller unit 950 can judge whether that in order to store corresponding flag value at detected state defectiveness is detected according to the flag value of flag register 955.In one embodiment, micro controller unit 950 is driven by exclusive power supply 903, and all the other elements that fluorescent tube detects drive system 900 are then driven by common source 904.In another embodiment, micro controller unit 950 can drive by common source 904 with all the other elements that fluorescent tube detects drive system 900.In addition, micro controller unit 950 produces the multiplexer module 989 of selecting signal Ssel to export defects detection module 970 in addition.
Fig. 9 is that the fluorescent tube that is used for the fluorescent tube detection drive system of Fig. 1 detects the driving method flow chart.As shown in Figure 9, fluorescent tube detection driving method 990 comprises the following step:
Step S901: the exclusive power supply 203 of activation is carried out the internal initialization setting to drive micro controller unit 250;
Step S903: download parameter and fill a prescription to the nonvolatile memory 252 of micro controller unit 250;
Step S905: micro controller unit 250 produces the pulse width modulation signal according to the parameter prescription and exports driving signal control circuit 225 to;
Step S907: micro controller unit 250 judges whether common source 204 is enabled to drive all the other elements that fluorescent tube detects drive system 200, if being enabled, common source 204 detects drive system 200 to drive fluorescent tube, execution in step S911 then, otherwise execution in step S909;
Step S909: the flag value of micro controller unit 250 replacement flag registers 255 and a plurality of shutdown signal S
LK_1-S
LK_NBe trouble-free state value and decapacitation signal, and lamp current control signal and a plurality of reference signal detection are reset to zero, execution in step S907;
Step S911: micro controller unit 250 produces lamp current control signal, voltage reference signal, fluorescent tube open circuit reference signal, reversal connection reference signal detection, high current reference signal and low current reference signal according to the parameter prescription;
Step S913: whether the flag value of judging flag register 255 is the trouble-free state value, if the flag value of flag register 255 is the trouble-free state value, and execution in step S915 then, otherwise execution in step S919;
Step S915: start driving signal control circuit 225, fluorescent tube detects drive system 200 and produces a plurality of drive signals via 215 outputs of a plurality of connectivity ports according to pulse width modulation signal and lamp current control signal;
Step S917: extract defects detection module 270 according to the fluorescent tube of voltage reference signal and 230 feed-ins of feedback circuit before terminal voltage signal carry out the short-circuit detection signal that the short-circuit detecting program produces;
Step S919: micro controller unit 250 judges according to short-circuit detection signal whether the fluorescent tube front end is short-circuited to fluorescent tube rear end or other low pressure places, if the fluorescent tube front end high is short-circuited to fluorescent tube rear end or other low pressure places, and execution in step S921 then, otherwise execution in step S925;
Step S921: the flag value of setting flag register 255 is the defect state value;
Step S923: close driving signal control circuit 225, execution in step S925;
Step S925: carry out delay routine light a lamp stabilization time or the stabilization time of lighting a lamp decided at the higher level but not officially announced that micro controller unit 250 sets according to the parameter prescription;
Step S926: extract defects detection module 270 and carry out the open circuit detection signal that the open circuit trace routine produces according to the fluorescent tube rear end current signal or the fluorescent tube front end current signal of fluorescent tube open circuit reference signal and 230 feed-ins of feedback circuit;
Step S927: extract defects detection module 270 and carry out the reversal connection detection signal that the reversal connection trace routine produces according to the fluorescent tube rear end current signal and the fluorescent tube front end current signal of reversal connection reference signal detection and 230 feed-ins of feedback circuit;
Step S928: extract defects detection module 270 according to high current reference signal, low current reference signal, and the fluorescent tube rear end current signal of 230 feed-ins of feedback circuit carry out the lamp tube current balance detection signal that the lamp tube current balance trace routine produces;
Step S929: micro controller unit 250 judges that according to the open circuit detection signal connectivity port open loop state is with the counting normal fluorescent tube number that detected, and the corresponding shutdown signal of activation, be used for closing corresponding drive circuit 220 to stop the connectivity port 215 output high-voltage driven signals of opening a way;
Step S931: micro controller unit 250 comparative parameter prescriptions set couple the fluorescent tube number with the institute the normal fluorescent tube number that detects to have judged whether the fluorescent tube open circuit defect, couple the fluorescent tube number and equate if set with the normal fluorescent tube number of detect, execution in step S937 then, otherwise execution in step S933;
Step S933: the flag value of setting flag register 255 is the defect state value;
Step S935: close driving signal control circuit 225, execution in step S937;
Step S937: micro controller unit 250 has judged whether connectivity port reversal connection situation according to the reversal connection detection signal, if reversal connection situation in connectivity port arranged, and execution in step S939 then, otherwise execution in step S943;
Step S939: the flag value of setting flag register 255 is the defect state value;
Step S941: close driving signal control circuit 225, execution in step S943;
Step S943: micro controller unit 250 has judged whether the lamp current out-of-balance conditions according to the lamp tube current balance detection signal, if the lamp current out-of-balance conditions arranged, and execution in step S945 then, otherwise execution in step S907;
Step S945: the flag value of setting flag register 255 is the defect state value; And
Step S947: close driving signal control circuit 225, execution in step S907.
Detect in the flow process of driving method 990 at above-mentioned fluorescent tube, if micro controller unit 250 and fluorescent tube detect all the other elements of drive system 200 and drive by common source 204, then the variable more activation common power source of the program of step S901 204 detects drive system 200 to drive fluorescent tube, and the internal initialization of carrying out micro controller unit 250 is set, in addition, step S907 and step S909 then can omit, and promptly behind execution in step S905, follow execution in step S911.The described download parameter of step S903 is filled a prescription to the nonvolatile memory 252 of micro controller unit 250, can download parameter at any time and fill a prescription to the nonvolatile memory 252 of micro controller unit 250 according to interrupt mode (Interrupt Scheme).The voltage reference signal of the described voltage reference signal of step S917 for being produced according to the parameter prescription, or be voltage reference signal decided at the higher level but not officially announced.The current reference signal of step S926 described fluorescent tube open circuit reference signal for being produced according to the parameter prescription, or be current reference signal decided at the higher level but not officially announced.The reversal connection reference signal detection of the described reversal connection reference signal detection of step S927 for being produced according to the parameter prescription, or be reversal connection reference signal detection decided at the higher level but not officially announced.The high current reference signal of the described high current reference signal of step S928 for being produced according to the parameter prescription, or be high current reference signal decided at the higher level but not officially announced.The low current reference signal of the described low current reference signal of step S928 for being produced according to the parameter prescription, or be low current reference signal decided at the higher level but not officially announced.
The delay routine that step S925 is performed just carries out in order to delay execution in step S926, to make to light a lamp that follow-up open circuit detects after stable, connectivity port reversal connection detection and lamp tube current balance detect to produce accurate detection signal.Can be as for the described short-circuit detecting program of step S917 in the preceding execution of step S925, because of accurate short-circuit detection signal can be carried out and produce to the short-circuit detecting program before stable lighting a lamp.In the program of step S929, when having detected the connectivity port open loop state, i.e. the corresponding shutdown signal of activation is used for stopping to open a way connectivity port 215 output high-voltage driven signals to guarantee testing staff's handling safety to close corresponding drive circuit 220.
Though the present invention with embodiment openly as above; right its is not in order to limit the present invention; any have a general technical staff of the technical field of the invention; without departing from the spirit and scope of the present invention; when can doing various changes and retouching, so protection scope of the present invention is when being as the criterion with the determined scope of the claim of enclosing.
Claims (26)
1. a fluorescent tube detects drive system, comprises:
One micro controller unit is in order to provide a pulse width modulation signal, a lamp current control signal and a plurality of reference signal detection according to a parameter prescription;
One driving signal control circuit is coupled in this micro controller unit, in order to produce a plurality of prime control signals according to this pulse width modulation signal;
A plurality of drive circuits, each drive circuit is coupled in this driving signal control circuit, is used for producing a drive signal to drive a corresponding fluorescent tube according to those prime control signals;
One defects detection module is coupled in this micro controller unit to receive those reference signal detection, in order to produce a plurality of detection signals according to those reference signal detection and a plurality of feedback signal; And
One feedback circuit is coupled in this defects detection module, produces those feedback signals in order at least one lamp current or at least one light tube electric voltage according at least one fluorescent tube.
2. fluorescent tube as claimed in claim 1 detects drive system, also comprises:
One digital to analog converter is coupled in this micro controller unit and this driving signal control circuit, in order to this lamp current control signal is converted to an analog control signal;
Wherein this driving signal control circuit produces those prime control signals according to this pulse width modulation signal and this analog control signal.
3. fluorescent tube as claimed in claim 2 detects drive system, also comprises:
One coffret is coupled between this micro controller unit and this digital to analog converter, and this coffret is a coffret or a general asynchronous receiving-transmitting transmitter between an integrated circuit (IC) chip.
4. fluorescent tube as claimed in claim 1 detects drive system, also comprises:
One digital to analog converter is coupled in this micro controller unit and this defects detection module, in order to those reference signal detection are converted to a plurality of analog;
Wherein this defects detection module produces those detection signals according to those analog and those feedback signals.
5. fluorescent tube as claimed in claim 1 detects drive system, also comprises:
Walk to the serial transmission transducer in the lump, be coupled in this micro controller unit and this defects detection module, in order to being converted to serial output and this micro controller unit of feed-in from those detection signals of the parallel input of this defects detection module.
6. fluorescent tube as claimed in claim 1 detects drive system, and wherein this micro controller unit comprises:
One flag register, in order to store a flag value, this flag value is to set according at least one detection signal; And
One nonvolatile memory is in order to store this parameter prescription;
Wherein this nonvolatile memory is an Electrically Erasable Read Only Memory or a flash memory.
7. fluorescent tube as claimed in claim 1 detects drive system, also comprises:
One coffret is coupled in this micro controller unit, and this coffret is a coffret or a general asynchronous receiving-transmitting transmitter between an integrated circuit (IC) chip;
Wherein this micro controller unit is downloaded this parameter prescription from this coffret.
8. fluorescent tube as claimed in claim 1 detects drive system, and wherein this defects detection module comprises a plurality of defect detection units, and each defect detection unit comprises:
One open detection circuit, in order to produce an open circuit detection signal of those detection signals according to a lamp current signal of those feedback signals and fluorescent tube open circuit reference signal, this fluorescent tube open circuit reference signal is an adjustable current reference signal of a current reference signal decided at the higher level but not officially announced or those reference signal detection, and this lamp current signal is a fluorescent tube rear end current signal or a fluorescent tube front end current signal;
One short-circuit detecting circuit, in order to produce a short-circuit detection signal of those detection signals according to a terminal voltage signal and a voltage reference signal before the fluorescent tube of those feedback signals, this voltage reference signal is an adjustable-voltage reference signal of a voltage reference signal decided at the higher level but not officially announced or those reference signal detection;
One lamp tube current balance testing circuit, in order to produce a lamp tube current balance detection signal of those detection signals according to this fluorescent tube rear end current signal, a high current reference signal and a low current reference signal, this high current reference signal is that one of a high current reference signal decided at the higher level but not officially announced or those reference signal detection can be adjusted high current reference signal, and this low current reference signal is that one of a low current reference signal decided at the higher level but not officially announced or those reference signal detection can be adjusted the low current reference signal; And
One connectivity port reversal connection testing circuit, in order to produce a reversal connection detection signal of those detection signals according to this fluorescent tube rear end current signal, this fluorescent tube front end current signal and a reversal connection reference signal detection, this reversal connection reference signal detection is that one of a reversal connection reference signal detection decided at the higher level but not officially announced or those reference signal detection can be adjusted the reversal connection reference signal detection.
9. fluorescent tube as claimed in claim 8 detects drive system, and wherein this open detection circuit comprises:
One comparator, comprise a first input end, one second input and an output, wherein this first input end is in order to receive this lamp current signal, and this second input is in order to receive this fluorescent tube open circuit reference signal, and this output is in order to export this open circuit detection signal.
10. fluorescent tube as claimed in claim 8 detects drive system, and wherein this short-circuit detecting circuit comprises:
One comparator, comprise a first input end, one second input and an output, wherein this first input end is in order to receive terminal voltage signal before this fluorescent tube, and this second input is in order to receive this voltage reference signal, and this output is in order to export this short-circuit detection signal.
11. fluorescent tube as claimed in claim 8 detects drive system, wherein this lamp tube current balance testing circuit comprises:
One first comparator comprises a positive input terminal, a negative input end and an output, and wherein this positive input terminal is in order to receive this high current reference signal, and this negative input end is in order to receive this fluorescent tube rear end current signal;
One second comparator comprises a positive input terminal, a negative input end and an output, and wherein this positive input terminal is in order to receive this fluorescent tube rear end current signal, and this negative input end is in order to receive this low current reference signal; And
One with the door, comprise a first input end, one second input and an output, wherein this first input end is coupled in the output of this first comparator, and this second input is coupled in the output of this second comparator, and this output is in order to export this lamp tube current balance detection signal.
12. fluorescent tube as claimed in claim 8 detects drive system, wherein this connectivity port reversal connection testing circuit comprises:
One difference channel, comprise a first input end, one second input and an output, wherein this first input end is in order to receive this fluorescent tube front end current signal, this second input is in order to receive this fluorescent tube rear end current signal, and this output deducts the difference signal that this fluorescent tube rear end current signal is produced in order to export this fluorescent tube front end current signal; And
One comparator, comprise a first input end, one second input and an output, wherein this first input end is in order to receive this reversal connection reference signal detection, and this second input is coupled in the output of this difference channel, and this output is in order to export this reversal connection detection signal;
Wherein this difference channel is a subtraction circuit or an instrument differential amplifier.
13. fluorescent tube as claimed in claim 1 detects drive system, wherein this micro controller unit is exported one in addition and is selected signal, and this defects detection module comprises:
One multiplexer module is coupled in this feedback circuit receiving those feedback signals, and is coupled in this micro controller unit to receive this selection signal, and this multiplexer module is exported a plurality of corresponding feedback signal of those feedback signals according to this selection signal; And
One defect detection unit is coupled in this multiplexer module to receive those corresponding feedback signals, in order to produce a plurality of corresponding detection signal of those detection signals according to those corresponding feedback signals.
14. fluorescent tube as claimed in claim 13 detects drive system, wherein this defect detection unit comprises:
One open detection circuit, in order to produce an open circuit detection signal of those corresponding detection signals according to lamp current signal of those corresponding feedback signals and fluorescent tube open circuit reference signal, this fluorescent tube open circuit reference signal is an adjustable current reference signal of a current reference signal decided at the higher level but not officially announced or those reference signal detection, and this lamp current signal is a fluorescent tube rear end current signal or a fluorescent tube front end current signal;
One short-circuit detecting circuit, in order to produce a short-circuit detection signal of those corresponding detection signals according to a terminal voltage signal before the fluorescent tube of those corresponding feedback signals and a voltage reference signal, this voltage reference signal is an adjustable-voltage reference signal of a voltage reference signal decided at the higher level but not officially announced or those reference signal detection;
One lamp tube current balance testing circuit, in order to produce a lamp tube current balance detection signal of those corresponding detection signals according to this fluorescent tube rear end or front end current signal, a high current reference signal and a low current reference signal, this high current reference signal is that one of a high current reference signal decided at the higher level but not officially announced or those reference signal detection can be adjusted high current reference signal, and this low current reference signal is that one of a low current reference signal decided at the higher level but not officially announced or those reference signal detection can be adjusted the low current reference signal; And
One connectivity port reversal connection testing circuit, in order to produce a reversal connection detection signal of those corresponding detection signals according to this fluorescent tube rear end current signal, this fluorescent tube front end current signal and a reversal connection reference signal detection, this reversal connection reference signal detection is that one of a reversal connection reference signal detection decided at the higher level but not officially announced or those reference signal detection can be adjusted the reversal connection reference signal detection.
15. fluorescent tube as claimed in claim 1 detects drive system, wherein each drive circuit comprises:
One prime driver is coupled in this driving signal control circuit, in order to produce a plurality of drive control signal according to those prime control signals; And
One transducer is coupled in this prime driver, in order to produce this drive signal according to those drive control signal;
Wherein this transducer is a full-bridge current device, a semibridge system converter or a push-pull type converter.
16. fluorescent tube as claimed in claim 15 detects drive system, wherein this micro controller unit is exported a plurality of shutdown signals in addition, and each drive circuit also comprises:
One fluorescent tube drives shut-off circuit, is coupled in this micro controller unit to receive a corresponding shutdown signal of those shutdown signals, in order to according to this correspondence shutdown signal those prime control signals or those drive control signal are pulled down to an earth level.
17. fluorescent tube as claimed in claim 1 detects drive system, wherein this micro controller unit is driven by an exclusive power supply.
18. fluorescent tube as claimed in claim 1 detects drive system, also comprises:
A plurality of transformers, each is transformer coupled in a corresponding drive circuit of those drive circuits, and being used for changing a corresponding drive signal is that a high-voltage driven signal is to drive a corresponding fluorescent tube.
19. a fluorescent tube detects driving method, comprises:
Download a parameter prescription;
Produce at least one drive signal to drive at least one fluorescent tube according to this parameter prescription; And
Provide at least one reference signal detection to carry out at least one defects detection program according to this parameter prescription.
20. fluorescent tube as claimed in claim 19 detects driving method, wherein produces this at least one drive signal according to this parameter prescription and comprises to drive this at least one fluorescent tube:
Produce at least one drive control signal according to this parameter prescription; And
Produce this at least one drive signal to drive this at least one fluorescent tube according to this at least one drive control signal.
21. fluorescent tube as claimed in claim 20 detects driving method, wherein produces this at least one drive control signal for to produce a pulse width modulation signal and a lamp current control signal according to this parameter prescription according to this parameter prescription.
22. fluorescent tube as claimed in claim 21 detects driving method, wherein producing this at least one drive signal according to this at least one drive control signal is to produce this at least one drive signal to drive this at least one fluorescent tube according to this pulse width modulation signal and this lamp current control signal to drive this at least one fluorescent tube.
23. fluorescent tube as claimed in claim 19 detects driving method, wherein provides this at least one reference signal detection to carry out this at least one defects detection program for provide fluorescent tube open circuit reference signal, a voltage reference signal, a high current reference signal, a low current reference signal or a reversal connection reference signal detection to carry out this at least one defects detection program according to this parameter prescription according to this parameter prescription.
24. fluorescent tube as claimed in claim 23 detects driving method, wherein provides this fluorescent tube open circuit reference signal, this voltage reference signal, this high current reference signal, this low current reference signal or this reversal connection reference signal detection to comprise to carry out this at least one defects detection program according to this parameter prescription:
According to this a fluorescent tube open circuit reference signal or a fluorescent tube open circuit reference signal decided at the higher level but not officially announced one lamp current signal is carried out an open circuit trace routine to produce an open circuit detection signal, this lamp current signal is a fluorescent tube rear end current signal or a fluorescent tube front end current signal;
According to this voltage reference signal or a voltage reference signal decided at the higher level but not officially announced to a fluorescent tube before terminal voltage signal carry out a short-circuit detecting program to produce a short-circuit detection signal;
According to this high current reference signal or a high current reference signal decided at the higher level but not officially announced and according to this a low current reference signal or a low current reference signal decided at the higher level but not officially announced this fluorescent tube front end or rear end current signal are carried out a lamp tube current balance trace routine to produce a lamp tube current balance detection signal; And
According to this a reversal connection reference signal detection or a reversal connection reference signal detection decided at the higher level but not officially announced this fluorescent tube rear end current signal and this fluorescent tube front end current signal are carried out a reversal connection trace routine to produce a reversal connection detection signal.
25. fluorescent tube as claimed in claim 24 detects driving method, also be included in according to this voltage reference signal or this voltage reference signal decided at the higher level but not officially announced to this fluorescent tube before terminal voltage signal carry out this short-circuit detecting program to produce after this short-circuit detection signal, postpone one and light a lamp stabilization time.
26. fluorescent tube as claimed in claim 19 detects driving method, also being included in according to this parameter prescription provides this at least one reference signal detection with after this at least one defects detection program of execution, when detecting a defective incident, carry out a fluorescent tube and drive bolt down procedure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810144960XA CN101340762B (en) | 2008-08-18 | 2008-08-18 | Lamp tube detection driving system and related detection driving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810144960XA CN101340762B (en) | 2008-08-18 | 2008-08-18 | Lamp tube detection driving system and related detection driving method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101340762A true CN101340762A (en) | 2009-01-07 |
| CN101340762B CN101340762B (en) | 2012-11-21 |
Family
ID=40214686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810144960XA Active CN101340762B (en) | 2008-08-18 | 2008-08-18 | Lamp tube detection driving system and related detection driving method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101340762B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102244957A (en) * | 2010-05-11 | 2011-11-16 | 联昌电子企业股份有限公司 | Light emitting diode (LED) system with detection module, driving device and error detection module |
| CN103926500A (en) * | 2014-04-22 | 2014-07-16 | 麦格纳（太仓）汽车科技有限公司 | Method for detecting LED constant current driving circuit performance |
| CN105636307A (en) * | 2014-11-28 | 2016-06-01 | 昱京能源科技股份有限公司 | Offset voltage cancellation circuit structure of dimming apparatus protection mechanism |
| WO2019068327A1 (en) * | 2017-10-05 | 2019-04-11 | Osram Gmbh | Power supply circuit, related lighting system and method of operating a power supply circuit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2621385Y (en) * | 2003-04-29 | 2004-06-23 | 杨同仁 | DC electronic ballast |
| CN101109855A (en) * | 2006-07-21 | 2008-01-23 | 台达电子工业股份有限公司 | Backlight module and its digital programmable control circuit |
| CN101137263A (en) * | 2006-08-28 | 2008-03-05 | 深圳市金威源科技有限公司 | Digital type electronic ballast and control method thereof |
| CN101207960A (en) * | 2006-12-24 | 2008-06-25 | 叶建国 | Drive unit of gas discharge lamp |
| CN201063926Y (en) * | 2007-07-02 | 2008-05-21 | 深圳创维－Rgb电子有限公司 | Back light source driving circuit and LCD device |
-
2008
- 2008-08-18 CN CN200810144960XA patent/CN101340762B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102244957A (en) * | 2010-05-11 | 2011-11-16 | 联昌电子企业股份有限公司 | Light emitting diode (LED) system with detection module, driving device and error detection module |
| CN103926500A (en) * | 2014-04-22 | 2014-07-16 | 麦格纳（太仓）汽车科技有限公司 | Method for detecting LED constant current driving circuit performance |
| CN103926500B (en) * | 2014-04-22 | 2016-08-24 | 麦格纳（太仓）汽车科技有限公司 | The method realizing the detection of constant current driver circuit for LED performance |
| CN105636307A (en) * | 2014-11-28 | 2016-06-01 | 昱京能源科技股份有限公司 | Offset voltage cancellation circuit structure of dimming apparatus protection mechanism |
| CN105636307B (en) * | 2014-11-28 | 2019-06-21 | 昱京能源科技股份有限公司 | The offset voltage of dimming device protection mechanism eliminates circuit structure |
| WO2019068327A1 (en) * | 2017-10-05 | 2019-04-11 | Osram Gmbh | Power supply circuit, related lighting system and method of operating a power supply circuit |
| US10993303B2 (en) | 2017-10-05 | 2021-04-27 | Osram Gmbh | Power supply circuit, lighting system, and method of operating a power supply circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101340762B (en) | 2012-11-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102054412B (en) | Device for detecting different motherboard circuits by commonly using power supply and display, and switching device | |
| CN201680231U (en) | LED backlight driving device of LCD | |
| CN102446477B (en) | Liquid crystal module test device with display port (DP) interface and test method thereof | |
| CN206879010U (en) | The universe point screen device of LCD TV TCONLESS plates | |
| CN102855862B (en) | Driving circuit of liquid crystal panel, liquid crystal panel and liquid crystal display device | |
| CN102243851B (en) | Liquid crystal display device with common voltage compensation mechanism and common voltage compensation method | |
| CN202454225U (en) | Led backlight drive circuit and display device | |
| CN105096810B (en) | A kind of driving part and display device | |
| CN101340762B (en) | Lamp tube detection driving system and related detection driving method | |
| CN203085128U (en) | Ageing test system | |
| CN106507560B (en) | Light-emitting diode backlight module and driving device thereof | |
| CN101527120A (en) | Method of driving a light source, light source device for performing the same, and display device having the light source device | |
| CN101800016A (en) | Discharge detection circuit and method, LCD drive g device and liquid crystal indicator | |
| CN101606439A (en) | Lamp abnormal detector and comprise inverter, backlight arrangement, the display unit of this lamp abnormal detector | |
| CN102368378A (en) | Gate drive unit and gate drive circuit | |
| CN109360535A (en) | The oblique cutting protection system of display driver circuit and oblique cutting guard method | |
| CN101055703B (en) | Apparatus and method for driving backlight of liquid crystal display apparatus | |
| CN102118904B (en) | LED illuminating system and control method thereof | |
| TWI412758B (en) | A system and adapter utilizing a power supply and a display device to test circuits of different types of main boards | |
| CN101556757A (en) | Test circuit of display driving circuit | |
| CN102646382A (en) | Method and device for detecting anomaly of liquid crystal display module differential signal receiving terminal | |
| CN101600285B (en) | Liquid crystal display, backlight module and drive method thereof | |
| CN108630164A (en) | Display device | |
| CN208188289U (en) | A kind of test macro of circuit power consumption | |
| CN102568393B (en) | Dummy load circuit, liquid crystal light source generating system and power supply conversion device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |