CN101352103A - Apparatus and method for controlling driving of lamp - Google Patents
Apparatus and method for controlling driving of lamp Download PDFInfo
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- CN101352103A CN101352103A CNA2007800010139A CN200780001013A CN101352103A CN 101352103 A CN101352103 A CN 101352103A CN A2007800010139 A CNA2007800010139 A CN A2007800010139A CN 200780001013 A CN200780001013 A CN 200780001013A CN 101352103 A CN101352103 A CN 101352103A
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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
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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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
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
-
- 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
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
- H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Abstract
Disclosed are an apparatus and a method for controlling driving of a lamp. The apparatus for controlling driving of a lamp includes a plurality of lamps, a switching module for switching supplied power to output an alternating current (AC) signal, a trans-module for converting the alternating signal into high-voltage signals having different phases to supply the high-voltage signals to the lamps, an open lamp detecting module for adding low-voltage signals having different phases feedback from the trans-module to detect open states of the lamps, and a controller for controlling an operation of the switching module by a signal detected in the open lamp detecting module.
Description
Technical field
Embodiment relates to a kind of equipment and method that is used to control the driving of lamp.
Background technology
Because as the feature that drives of in light weight, thin thickness and low-power consumption, LCD (LCD) shows the trend that application increases gradually.Because this trend, LCD has been used for business automation equipment, audio/video devices etc.
Simultaneously, the amount of the light of LCD adjusting transmission and the picture signal that a plurality of control switchs of arranging with matrix pattern are applied, thus on screen, show desired image.
Because this LCD is the device of non-emission, so it needs light source, as backlight.Light source backlight comprises cold-cathode fluorescence lamp (cold cathode fluorescent lamp) (being called " CCFL " hereinafter).
This lamp drives by having high-tension interchange (AC) signal via the lamp drive circuit reception.Yet when driving this lamp, this lamp may be disconnected owing to the input voltage of its defective or mistake.Therefore, need lamp to disconnect off-state and guard lamp drive circuit that protective circuit (open lamp protecting circuit) detects lamp.
Summary of the invention
Technical problem
Embodiment provides a kind of equipment and method that is used to control the driving of lamp, and its off-state that can detect lamp is used to drive the circuit of lamp with protection.
Embodiment provides a kind of equipment and method that is used to control the driving of lamp, and it can be added to the positive signal from transformer feedback negative signal with the off-state that detects lamp and the abnormal voltage of transformer.
Embodiment provides a kind of equipment and method that is used to control the driving of lamp, and it can simplify circuit by the quantity that reduces the parts that use in lamp disconnection detection module.
Technical scheme
Embodiment provides a kind of equipment that is used to control the driving of lamp, this equipment comprises a plurality of lamps, be used for switching the power that provides with the handover module of output AC (AC) signal, be used for AC signal be converted to high voltage signal with out of phase with conversion module that high voltage signal is provided to lamp, be used for being detected mutually from the low voltage signal with out of phase of conversion module feedback lamp off-state lamp disconnection detection module and be used for by control the controller of the operation of handover module at the detected signal of lamp disconnection detection module.
Embodiment provides a kind of equipment that is used to control the driving of lamp, this equipment comprises a plurality of lamps with first and second electrodes, and the inverter that is connected at least one electrode of this lamp, wherein this inverter comprises and is used to switch the power that the provides handover module with output AC (AC), being used for alternating current (AC) with this handover module is converted to and has high-tension positive signal and negative signal this positive signal and negative signal are offered the conversion module of lamp, be used for to be detected the lamp disconnection detection module of the off-state of lamp mutually from the positive signal with low-voltage of this conversion module feedback and negative signal, and be used for by control the controller of the operation of handover module at the detected signal of this lamp disconnection detection module.
Embodiment provides a kind of method of driving that is used to control lamp, this method may further comprise the steps: the control signal by controller is operated handover module, allow each transformer to provide and have high-tension positive signal and negative signal according to the operation of handover module, by detecting the off-state of lamp in the Calais mutually from the positive signal with low-voltage of transformer feedback and negative signal, if detect the off-state of lamp, then drive stop signal to controller output.
Beneficial effect
In the equipment and the method for driving that is used for controlling lamp according to present embodiment, can by with a pair of be unit will have an opposed polarity signal each other the algorithm arrangement of addition detect the off-state of lamp and the abnormal voltage of transformer.
In addition, can simplify the circuit block of lamp disconnection detection module.Therefore, can reduce the manufacturing cost of inverter, and the circuit structure of the simplification by lamp disconnection detection module reduces the defective proportion of parts.
Description of drawings
Fig. 1 illustrates the block diagram of structure of equipment that is used to control the driving of lamp according to embodiment;
Fig. 2 is the circuit diagram that conversion module shown in Fig. 1 and handover module are shown;
Fig. 3 is the block diagram that the lamp disconnection detection module shown in Fig. 1 is shown;
Fig. 4 illustrates the waveform of detected feedback signal under the normal condition at lamp in lamp disconnection detection module according to embodiment;
Fig. 5 illustrates the waveform of detected feedback signal under the off-state at lamp in lamp disconnection detection module according to embodiment;
Fig. 6 illustrates the view of structure of equipment that is used to control the driving of lamp according to first embodiment;
Fig. 7 illustrates the view of structure of equipment that is used to control the driving of lamp according to second embodiment;
Fig. 8 illustrates the view of structure of equipment that is used to control the driving of lamp according to the 3rd embodiment;
Fig. 9 illustrates the flow chart that is used to control the method for driving of lamp according to embodiment.
Embodiment
Following with reference to description of drawings embodiment.
Fig. 1 illustrates the block diagram of structure of equipment that is used to control the driving of lamp according to embodiment.
With reference to figure 1, the equipment 100 that is used to control the driving of lamp comprises inverter 101 and is provided with the lamp unit 140 of a plurality of lamp 141-141N.
The lamp driving power that inverter 101 will provide from the outside is converted to the AC signal, then with the AC conversion of signals for having high-tension positive-phase signal (positive-phase signal) S1 and negative phase signal (negative-phase signal) S2.Then, inverter 101 offers a plurality of lamp 141-14N with this positive-phase signal S1 and negative signal S2.In the case, the phase difference that has 180 degree between positive-phase signal S1 and the negative phase signal S2.
Lamp 141-14N is arranged in the lamp unit 140 parallel with one anotherly, and two signal S1 and S2 with out of phase are provided for lamp 141-14N.Lamp 141-14N comprises in cold-cathode fluorescence lamp (CCFL), external electrode fluorescent lamp (EEFL), hot-cathode fluorescent lamp (HCFL) and outside and the internal electrode fluorescent lamp (EIFL).Lamp 141-to 14N comprises inert gas (Ar, Ne etc.) in glass tube, the glass tube and the electrode that is installed in two ends of glass tube.Glass tube is filled with inert gas, and scribbles fluorescent material on the inwall of glass tube.
Lamp disconnection detection module 160 detects from the signal FB1-FBn of conversion module 130 feedbacks.Lamp disconnection detection module 160 detects positive-phase signal (hereinafter referred to as " positive signal ") and the negative phase signal (hereinafter referred to as " negative signal ") with low-voltage.Lamp disconnection detection module 160 is that unit is added to negative signal with positive signal with a pair of, thus the output addition result.In the case because positive signal has identical size and reciprocal polarity with negative signal, so normal two signals and become low signal.Yet, if lamp disconnects, positive signal and negative signal and become high signal.
In the case, lamp disconnection detection module 160 can be added to positive signal negative signal with the output addition result.In addition, lamp disconnection detection module 160 can be added to negative signal positive signal with the output addition result.Can be even this disconnects also simultaneously for two lamps by checking that the off-state that twice signal detects lamp exactly is essential.
Lamp disconnection detection module 160 detects the by-level of positive signal and negative signal, thereby output drives stop signal or drives inhibit signal.Therefore, lamp disconnection detection module 160 can detect the off-state of the voltage failure or the lamp 141-14N of conversion module 130.
Fig. 2 is the circuit diagram that the structure of handover module 120 and conversion module 130 is shown.
With reference to figure 2, handover module 120 comprises a plurality of commutation circuit 121-12N, and commutation circuit 121-12N is connected respectively to the transformer 131-13N of conversion module 130.
In the case, commutation circuit 121-12N carries out handover operation so that the AC signal is outputed to transformer 131-13N by the control signal of controller 110.Can revise the structure of commutation circuit 121-12N and transformer 131-13N, and present embodiment is not limited thereto.
The transformer 131-13N of conversion module 130 is provided with the first winding N1 at primary side, is provided with second and tertiary winding N2 and N3 at secondary side.The high voltage end of the second winding N2 and tertiary winding N3 provides two signal S1 and the S2 with out of phase to lamp, the phase place of these two signals and be zero.
In the case, the quantity of transformer 131-13N is identical with the quantity of lamp.According to present embodiment, can provide at least two signals.For example, the phase place about the signal that offers each lamp can provide N (2≤N≤36) individual drive signal, makes drive signal have and the corresponding phase difference of value with 360 ° of acquisitions of the individual lamp dividing elements of N (2≤N≤36).At this moment, the phase difference of N drive signal with must be zero.
Transformer 131-13N exports via the high voltage end of the second winding N2 and tertiary winding N3 at its secondary side has high-tension positive signal S1 and negative signal S2.Transformer 131-13N is at low side feedback positive signal FB1-FBm and the negative signal FB2-FBn of its secondary side via the second winding N2 and tertiary winding N3.Feedback signal FB1-FBn be have with at the secondary side of transformer 131-13N low voltage signal from the identical phase place of the phase place of the signal S1 of high voltage end output and S2.
In the case, output feedback signal FB1-FBn between second end of the low-voltage end of the secondary side of transformer 131-13N and grounding resistor R1-RN.
Fig. 3 is the block diagram that illustrates according to the structure of the lamp disconnection detection module 160 of present embodiment, and wherein lamp disconnection detection module 160 detects the off-state of lamp based on four feedback signal FB1-FB4.
With reference to figure 3, lamp disconnection detection module 160 comprises first to the 8th signal deteching circuit 161-168, first to the 7th adder circuit 171-177, first to fourth protective circuit 181-184 and Drive and Control Circuit 191.
First to the 8th signal deteching circuit 161-168 is branched off into two paths to detect feedback signal FB1-FB4.The first and the 3rd feedback signal FB1 and FB3 are positive signals, and the second and the 4th feedback signal FB2 and FB4 are negative signals.
The first and the 5th signal deteching circuit 161 and 165 positive signals that detect as first feedback signal.The second and the 8th signal deteching circuit 162 and 168 negative signals that detect as second feedback signal.The the 3rd and the 7th signal deteching circuit 163 and 167 positive signals that detect as the 3rd feedback signal, the 4th and the 6th signal deteching circuit 164 and 166 negative signals that detect as the 4th feedback signal.
In the case, first to fourth adder circuit 171-174 can be used as first addition node and realizes.The the 5th and the 6th adder circuit 175 and 176 can be used as second addition node and realizes.The 7th adder circuit 177 can be used as third phase and adds node and realize.In addition, the 5th to the 7th adder circuit 175-177 can be used as second addition node and realizes.Present embodiment is not limited thereto.
First to fourth adder circuit 171-174 is that unit is added to a negative signal with a positive signal with a pair of.For example, first adder circuit 171 is with first and second signal deteching circuits 161 and 162 detected positive signals and negative signal addition.Second adder circuit 172 is with third and fourth signal deteching circuit 163 and 164 detected two signal plus.Third phase adds circuit 173 with the 5th and the 6th testing circuit 165 and 166 detected two signal plus.The 4th adder circuit 174 is with the 7th and the 8th testing circuit 167 and 168 detected two signal plus.
As shown in Figure 4, first adder circuit 171 is with the first and second feedback signal FB1 and the FB2 addition of normal condition, thus output low signal (for example 0V).
As shown in Figure 5, first adder circuit 171 is first feedback signal FB1 of normal condition and the second feedback signal FB2 addition of off-state, thereby exports the first feedback signal FB1.For example, if be disconnected about the lamp of the second feedback signal FB2, then the second feedback signal FB2 be reduced to low-level (for example, 0V) or lower.Because the phase difference between first and second feedback signals is not just in time to be 180 °, so the addition result FB1+FB2 of these two signals may be high signal.
The 5th adder circuit 175 is with the addition result addition of first and second adder circuits 171 and 172.The 6th adder circuit 176 is with the addition result addition of third and fourth adder circuit 173 and 174.The 7th adder circuit 177 is with the addition result addition of the 5th and the 6th adder circuit 175 and 176.
First to the 7th adder circuit 171-177 can be based on carrying out the phase add operation by a positive signal being added to the result that two mutual different negative signals obtain.In addition, first to the 7th adder circuit 171-177 can be based on carrying out the phase add operation by a negative signal being added to the result that two mutual different positive signals obtain.
As shown in Figures 2 and 3, first and second adder circuits 171 will be from the signal FB1 and the FB2 of identical transformer feedback with 172, and FB3 and FB4 addition.In addition, third and fourth adder circuit 173 will be from feedback signal FB1 and FB4 and the FB2 and the FB3 addition of different transformer feedback with 174.
As mentioned above, because lamp disconnection detection module 160 can be checked feedback signal twice, so be in off-state even be applied to two feedback signals of an adder circuit, lamp disconnection detection module 160 also can detect the off-state of lamp.
First to fourth protective circuit 181-184 is arranged in the output of first to fourth adder circuit 171-174, is applied to the overvoltage of transformer and forward current is passed through thereby cut off.Can change the layout of protective circuit 181-184, and present embodiment is not limited thereto.
Drive and Control Circuit 191 drives stop signal or drives inhibit signal to controller 110 outputs according to the addition result of the 7th adder circuit 177.If the addition result of the 7th adder circuit 177 is high signals, then Drive and Control Circuit 191 is defined as the off-state of lamp with this high signal, drives stop signal thereby export.If the addition result of the 7th adder circuit 177 is low signals, then Drive and Control Circuit 191 is defined as the normal condition of lamp with this low signal, drives inhibit signal thereby export.
Fig. 6 illustrates the circuit diagram of structure of equipment 100A that is used to control the driving of lamp according to first embodiment, and the equipment 100A that wherein is used to control the driving of lamp detects the off-state of the lamp 141-144 that is connected to two transformers 131 and 133.
With reference to figure 6, handover module 120 is to first and second transformers 131 and 132 output AC signals.First electrode 151 of lamp 141-144 is connected at second winding N2 of the secondary side setting of first and second transformers 131 and 132 and the high voltage end of tertiary winding N3.In addition, lamp disconnection detection module 160 is connected to the second winding N2 of secondary side of transformer 131 and 132 and the low-voltage end of tertiary winding N3.Lamp 141 and two electrodes 151 and 152 of 142 are connected in series to high voltage capacitor Ca and Cb.
First and second signal deteching circuits 161 and 162 are connected to the second winding N2 of secondary side of first transformer 131 and the low-voltage end of tertiary winding N3.Third and fourth signal deteching circuit 163 and 164 is connected respectively to the second winding N2 of secondary side of second transformer 132 and the low-voltage end of tertiary winding N3.
First to fourth signal deteching circuit 161-164 can be respectively by using voltage grading resistor (division resistor) R1 and R2, R3 and R4, R5 and R6 and R7 and R8 to realize.First and second testing circuits 161 and 162 detect positive signal FB1 and the negative signal FB2 in the secondary side feedback of first transformer 131.Third and fourth signal deteching circuit 163 and 164 detects positive signal FB3 and the negative signal FB4 in the secondary side feedback of second transformer 132.
First and second adder circuits 171 and 172 can be used as addition node and realize.First adder circuit 171 will be from first and second signal deteching circuits 161 and 162 detected positive signals and negative signal addition each other.Second adder circuit 172 will be from third and fourth signal deteching circuit 163 and 164 detected positive signals and negative signal addition each other.
First and second protective circuits 181 and 182 can realize by using diode, and be arranged on the signal of the output of first and second adder circuits 171 and 172 with the cut-out reverse flow.
Third phase adds circuit 175 will be from the addition result addition each other of first and second adder circuits 171 and 172.The quantity of signal deteching circuit and adder circuit can change according to the quantity of transformer.
Third phase adds the output signal of circuit 175 by resistor R 9 and R10 and capacitor C1, makes and remove noise from output signal.Then, this output signal is input to Drive and Control Circuit 191.
Drive and Control Circuit 191 can be used as transistor Q1 and realizes, and the output signal that the third phase of the base stage by being input to transistor Q1 adds circuit 175 is come conducting/shutoff transistor Q1.Specifically, if high signal is applied to the base stage of transistor Q1, then transistor Q1 conducting, and will output to its collector electrode as the driving stop signal of low signal.If low signal is applied to the base stage of transistor Q2, then transistor Q1 turn-offs, and will output to its collector electrode as the driving inhibit signal of high signal.
Fig. 7 illustrates the structure of equipment 100B that is used to control the driving of lamp according to second embodiment.To having distributed identical Reference numeral, and omit it is described in detail to avoid repetition with components identical shown in Fig. 6.
With reference to figure 7, first and second inverters 102 and 103 are set in two ends of lamp unit 140.Detect the electrode 151 of lamp 145 and 146 and 152 off-state (open state) by first and second inverters 102 and 103.
Carry out brief description about first inverter 102 below.The lamp 145 and 146 first electrode 151 are connected to the high voltage end of second and tertiary winding N2 and N3 of the secondary side of the first transformer 131A.The first lamp disconnection detection module 160A is connected to the low-voltage end of second and tertiary winding N2 and N3 of the secondary side of the first transformer 131A.The first lamp disconnection detection module 160A comprises the first and second signal deteching circuit 161A and 162A, adder circuit 171A, protective circuit 181A and Drive and Control Circuit 191A.The first lamp disconnection detection module 160A detects the off-state about first electrode 151 of lamp 145 and 146.
Carry out brief description about second inverter 103 below.The lamp 145 and 146 second electrode 152 are connected to the high voltage end of second and tertiary winding N2 and N3 of the secondary side of the second transformer 131B.The second off-state detection module 160B is connected to the low-voltage end of second and tertiary winding N2 and N3 of the secondary side of the second transformer 131B.The second lamp disconnection detection module 160B comprises the first and second signal deteching circuit 161B and 162B, adder circuit 171B, protective circuit 181B and Drive and Control Circuit 191B.The second lamp disconnection detection module 160B detects the off-state about second electrode 152 of lamp 145 and 146.
Fig. 8 illustrates the view of structure of equipment 100C that is used to control the driving of lamp according to the 3rd embodiment.To having distributed identical Reference numeral, and omit it is described in detail to avoid repetition with components identical shown in Fig. 6.
With reference to figure 8, by the signal that uses a transformer 133 to provide to have out of phase to drive all lamp 141a, 141b, 141c, 142a, 142b and the 142c of lamp unit 140.
Therefore, lamp disconnection detection module 160C is added to the detected signal of secondary signal testing circuit 162C by adder circuit 171C with the detected signal of the first signal deteching circuit 161C.The sum signal that obtains among the adder circuit 171C is input to the non-oppisite phase end (+) of comparator 185, and comparator 185 relatively is input to the signal of non-oppisite phase end (+) and is applied to the reference voltage V ref of end of oppisite phase (-).In the case, if sum signal is higher than reference voltage V ref, then comparator 185 is exported high signal.If sum signal is lower than reference voltage V ref, then comparator 185 is exported low signals.Reference voltage V ref is the value of coming the bucking voltage difference to obtain by the operation according to the lamp of second winding N2 of secondary side that is connected to transformer 133 and tertiary winding N3.
The high signal of comparator 185 drives Drive and Control Circuit 191C and outputs to controller 110 will drive stop signal.
Fig. 9 illustrates the flow chart that is used to control the method for driving of lamp according to embodiment.
With reference to figure 9, controller is exported control signal (step S101) to handover module.Handover module is operated with output lamp driving power by this control signal, thereby drives conversion module (step S102).
Conversion module will be to offer high-tension positive-phase signal of having of a plurality of lamps and negative phase signal (step S103) from the AC conversion of signals of handover module input.
Lamp disconnection detection module detects from the positive-phase signal with low-voltage and the negative phase signal (step S104) of conversion module feedback.With a pair of be unit with positive-phase signal and negative phase signal addition each other, export addition result (step S105) then.This addition result can be added to another addition result.
Then, if addition result is high signal, then drive stop signal (step S106 and S107) to controller output.If addition result is a low signal, then drive inhibit signal (step S108) to controller output.
As mentioned above, this equipment that is used to drive lamp can stably be controlled back lighting device by the drive controlling to lamp, thereby can improve the reliability of LCD.
Industrial usability
In the equipment and the method for driving that is used for controlling lamp according to embodiment, can by with a pair of signal with opposite polarity each other the algorithm arrangement of addition detect the off-state of lamp and the abnormal voltage of transformer.
In addition, can simplify the circuit part of lamp disconnection detection module.Therefore, can reduce manufacturing cost, and reduce shortage probability.
In addition, detect the off-state of lamp, thereby improved the reliability of back lighting device and LCD.
Claims (20)
1. equipment that is used to control the driving of lamp, this equipment comprises:
A plurality of lamps;
Handover module is used to switch the power that provided with output AC (AC) signal;
Conversion module, be used for described AC signal be converted to have out of phase high voltage signal so that described high voltage signal is offered described lamp;
Lamp disconnection detection module is used for and will be detected the off-state of described lamp mutually from the low voltage signal with out of phase of described conversion module feedback; And
Controller is used for by control the operation of described handover module at the detected signal of described lamp disconnection detection module.
2. equipment according to claim 1, wherein said lamp are in cold-cathode fluorescence lamp (CCFL), external electrode fluorescent lamp (EEFL), hot-cathode fluorescent lamp (HCFL) and outside and the internal electrode fluorescent lamp (EIFL).
3. equipment according to claim 1, wherein said conversion module comprise having a winding part that is connected to described handover module and at least one transformer that is connected to the secondary winding part of described lamp and described lamp disconnection detection module.
4. equipment according to claim 1, wherein said conversion module comprises having the primary side that is wound with first coil and be wound with second and at least one transformer of the secondary side of tertiary coil, wherein at least one lamp is connected to the high voltage end of described second and tertiary coil of the described secondary side that is wrapped in described transformer, and described lamp disconnection detection module is connected to described second and the low-voltage end of tertiary coil.
5. equipment according to claim 1, wherein said signal with out of phase has 180 ° phase difference.
6. equipment according to claim 1, wherein said lamp disconnection detection module detect from the intermediate voltage of the described signal with out of phase of described conversion module feedback.
7. equipment according to claim 1, wherein said lamp disconnection detection module is by being that unit will export described signal from the signal plus with out of phase of described conversion module feedback with a pair of.
8. equipment according to claim 5, wherein said lamp disconnection detection module is added to the positive signal from described conversion module feedback at least one negative signal or by being added to the addition result addition that at least one positive signal obtains from the negative signal of described conversion module feedback, comes output signal by making.
9. equipment according to claim 1 wherein is provided with described handover module, described conversion module, lamp disconnection detection module and described controller in two ends of described lamp unit.
10. equipment according to claim 5, wherein said lamp disconnection detection module comprises:
A plurality of signal deteching circuits are used for by detecting this signal to different paths from the signal branch of the transformer feedback of described conversion module;
Adder circuit, being used for a pair of is that unit is added to negative signal with the detected positive signal of described signal deteching circuit; And
Drive and Control Circuit is used for driving stop signal and driving inhibit signal to described controller output according to the described addition result of described adder circuit.
11. equipment according to claim 10, wherein said adder circuit comprises:
First adder circuit, being used for a pair of is that unit is added to negative signal with positive signal, wherein said positive signal and negative signal are from identical transformer feedback;
Second adder circuit, being used for a pair of is that unit is added to negative signal with positive signal, wherein said positive signal and negative signal are from different transformer feedback; And
Third phase adds circuit, is used for the addition result of described first adder circuit is added to the addition result of described second adder circuit.
12. the equipment according to claim 10 is stated comprises:
Protective circuit, the voltage to stop that opposite direction flows between described signal deteching circuit and described Drive and Control Circuit; And
Comparator is used for the addition result and the reference voltage of more described adder circuit.
13. an equipment that is used to control the driving of lamp, this equipment comprises:
A plurality of lamps with first and second electrodes; And
Be connected to the inverter of at least one electrode of described lamp,
Wherein said inverter comprises:
Handover module is used to switch the power that provided with output AC electricity (AC);
Conversion module is used for described alternating current (AC) with described handover module and is converted to and has high-tension positive signal and negative signal so that this positive signal and negative signal are offered described lamp;
Lamp disconnection detection module is used for being detected the off-state of described lamp from the positive signal with low-voltage of described conversion module feedback and negative signal mutually; And
Controller is used for by control the operation of described handover module at the detected signal of described lamp disconnection detection module.
14. equipment according to claim 13, wherein said lamp disconnection detection module detect from the positive signal of described conversion module feedback and the intermediate voltage between the negative signal.
15. equipment according to claim 13, wherein said lamp disconnection detection module comprises:
Voltage grading resistor is used for detecting this signal by being branched off into two paths from the positive signal of described conversion module feedback and negative signal; And
First addition node, being used for a pair of is that unit is added to described negative signal with described positive signal, and second addition node, is used for carrying out the phase add operation based on the described addition result of described first addition node.
16. equipment according to claim 15 comprises transistor, is used for driving stop signal or driving inhibit signal to described controller output according to the addition result of described second addition node.
17. equipment according to claim 13, wherein a plurality of described inverters are connected two electrode places of described lamp.
18. equipment according to claim 13, wherein said conversion module comprise a transformer that is used for having to first electrode of described lamp or the output of second electrode high-tension described positive signal and negative signal.
19. a method of driving that is used to control lamp, this method may further comprise the steps:
Control signal operation handover module by controller;
Allow each transformer to provide and have high-tension positive signal and negative signal according to the operation of described handover module;
By being added to the off-state that negative signal detects lamp from the positive signal with low-voltage of described transformer feedback; And
If detect the off-state of lamp, then drive stop signal to described controller output.
20. method according to claim 19, the step of the off-state of wherein said detection lamp may further comprise the steps:
Via the signal of different path detection from described transformer feedback;
With detected described positive signal and the addition each other of described negative signal; And detect described off-state by phase add operation to described addition result.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020060066538 | 2006-07-14 | ||
| KR1020060066538A KR100728439B1 (en) | 2006-07-14 | 2006-07-14 | Open lamp protection circuit |
| KR10-2006-0066538 | 2006-07-14 | ||
| KR10-2007-0058386 | 2007-06-14 | ||
| KR1020070058386 | 2007-06-14 | ||
| KR1020070058386A KR100877884B1 (en) | 2007-06-14 | 2007-06-14 | Apparatus for controlling lamp and method thereof |
| PCT/KR2007/003409 WO2008007925A1 (en) | 2006-07-14 | 2007-07-13 | Apparatus and method for controlling driving of lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101352103A true CN101352103A (en) | 2009-01-21 |
| CN101352103B CN101352103B (en) | 2013-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800010139A Expired - Fee Related CN101352103B (en) | 2006-07-14 | 2007-07-13 | Apparatus and method for controlling driving of lamp |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100728439B1 (en) |
| CN (1) | CN101352103B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100862357B1 (en) * | 2007-09-10 | 2008-10-13 | 엘지이노텍 주식회사 | Back light drive device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0355794A (en) * | 1989-07-24 | 1991-03-11 | Hitachi Ltd | Discharge lamp lighting device |
| KR100486800B1 (en) * | 2003-01-23 | 2005-05-03 | 주식회사 디에스이 | Fluorescent lamp with DC ballast and lamp apparatus adopting the same |
| KR20060107168A (en) * | 2005-04-08 | 2006-10-13 | 주식회사이데아플랜 | A control circuit of headlight for automobile having with gas discharging lamp |
| KR100699577B1 (en) * | 2005-08-25 | 2007-03-23 | 삼성전기주식회사 | Protection circuit of floating typed inverter driving circuit and protection method thereof |
-
2006
- 2006-07-14 KR KR1020060066538A patent/KR100728439B1/en not_active IP Right Cessation
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2007
- 2007-07-13 CN CN2007800010139A patent/CN101352103B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR100728439B1 (en) | 2007-06-13 |
| CN101352103B (en) | 2013-01-23 |
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