CN201414255Y - Light tube driving device with open circuit voltage control - Google Patents
Light tube driving device with open circuit voltage control Download PDFInfo
- Publication number
- CN201414255Y CN201414255Y CN2009201465123U CN200920146512U CN201414255Y CN 201414255 Y CN201414255 Y CN 201414255Y CN 2009201465123 U CN2009201465123 U CN 2009201465123U CN 200920146512 U CN200920146512 U CN 200920146512U CN 201414255 Y CN201414255 Y CN 201414255Y
- Authority
- CN
- China
- Prior art keywords
- square wave
- signal
- lamp tube
- square
- open 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.)
- Ceased
Links
Images
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
The utility model discloses a light tube driving device with open circuit voltage control, which consists of a DC (direct current) power supply, a square wave switcher, a square wave controller, an LCresonance circuit, a driver transformer and a current detector, wherein square wave signals are output to the LC resonance circuit by the square wave switcher and then converted into sine wave signals by the LC resonance circuit so as to output the sine wave signals to the driver transformer, finally, the light tube is driven to work by the driver transformer, and simultaneously, whether the light tube works normally or not is detected by the current detector; and when abnormal circuit open occurs to the light tube, the wave width of the square controller can be controlled so as to control apin, thus causing the light tube driving device to stop work immediately and then improving the safety of product usage.
Description
Technical field
The utility model relates to a kind of lamp tube driver with open circuit voltage control.
Background technology
See also Fig. 1; enforcement Organization Chart for existing lamp tube driver; by among the figure as can be known; existing type of drive with lamp tube driver 1 of open circuit voltage control; be by DC power supply 11; provide dc signal to square wave switch 12; this square wave switch 12 can provide square-wave signal to LC resonant circuit 14; and provide string ripple signal to driving transformer 13 by LC resonant circuit 14; and promote fluorescent tube 15 by driving transformer 13; under this framework, generally can two capacity cells 16 be set, and by the dividing potential drop control mode controlling signal be fed back to square wave controller 17 and carry out overvoltage protection in driving transformer 13 secondary sides and 15 of fluorescent tubes.Though the above-mentioned purpose that reaches overvoltage protection has following shortcoming in use:
1. have the mode of reaching overvoltage protection by the capacitance partial pressure mode now,, therefore will cause the cost of lamp tube driver significantly to increase because high voltage bearing capacity cell unit price is higher.
2. under existing framework, the quality quality of capacity cell will directly influence the stability of whole drive unit, so selecting for use of capacity cell will be a big key of circuit design.
Summary of the invention
The purpose of this utility model is to provide a kind of lamp tube driver with open circuit voltage control, replaces the existing technology of using capacitance partial pressure control by current sense device circuit, can solve the expensive problem that available circuit produces.
Of the present utility model time a purpose promptly is to provide a kind of lamp tube driver with open circuit voltage control, be to detect fluorescent tube by the current sense device whether normally to operate, when if unusual open loop state takes place in fluorescent tube, can control by the wide control pin of the ripple of controlling party wave controller position, lamp tube driver is decommissioned immediately, the fail safe when improving the product use with this.
Another purpose of the present utility model is to provide a kind of lamp tube driver with open circuit voltage control, improves the fail safe that product uses and reduces the product cost except that having, and has more extension fixture useful life and save circuit advantages such as space are set.
For realizing above purpose, the utility model has been taked following technical scheme: have the lamp tube driver of open circuit voltage control, be made up of DC power supply, square wave switch, square wave controller, LC resonant circuit, driving transformer and current sense device; Wherein export square-wave signal to the LC resonant circuit by the square wave switch, and convert square-wave signal to string ripple signal by the LC resonant circuit, and will export this string ripple signal to driving transformer, drive the fluorescent tube start by driving transformer at last, whether and it is normal to detect the fluorescent tube running by the current sense device simultaneously, if when unusual open loop state takes place fluorescent tube, can control, lamp tube driver is decommissioned immediately by the wide control pin of the ripple of controlling party wave controller position.
The utility model compared with prior art has following advantage:
1, the utlity model has the lamp tube driver of open circuit voltage control, replace the existing technology of using capacitance partial pressure control, can solve the expensive problem that available circuit produces by current sense device circuit.
2, the utlity model has the lamp tube driver of open circuit voltage control, whether detect the fluorescent tube running by the current sense device normal, when if unusual open loop state takes place in fluorescent tube, can control by the wide control pin of the ripple of controlling party wave controller position, but make still normal operation of lamp tube driver, promote the stability of drive unit.
3, the utlity model has the lamp tube driver of open circuit voltage control, improve the stability that product uses and reduce the product cost, have more extension fixture useful life and save circuit advantages such as space are set except that having.
Description of drawings
Fig. 1 is existing enforcement Organization Chart with lamp tube driver of open circuit voltage control;
Fig. 2 is the first enforcement Organization Chart that the utlity model has the lamp tube driver of open circuit voltage control;
Fig. 3 has the second enforcement Organization Chart of the lamp tube driver of open circuit voltage control for this;
Fig. 4 is that the circuit of the utility model current sense device is implemented schematic diagram; And
Fig. 5 is that another circuit of this current sense device is implemented schematic diagram;
Description of reference numerals: 1, existing lamp tube driver with open circuit voltage control, 11, DC power supply, 12, square wave switch, 13, driving transformer, 14, the LC resonant circuit, 15, fluorescent tube, 16 capacity cells, 17, the square wave controller, 2, have a lamp tube driver of open circuit voltage control, 21, DC power supply, 22, square wave switch, 23, the LC resonant circuit, 231, inductance element, 232, capacity cell, 24, square wave controller, 241, the wide control pin of ripple position, 25, driving transformer, 26, fluorescent tube, 27, the current sense device.
Embodiment
Below in conjunction with the drawings and specific embodiments content of the present utility model is described in further details.
Embodiment:
See also Fig. 2, provide first of lamp tube driver with open circuit voltage control to implement Organization Chart for the utility model, by among the figure as can be known, the utlity model has the lamp tube driver 2 of open circuit voltage control, comprising:
Driving transformer 25 is changed the string ripple signal of input, exports fluorescent tube 26 again to, in order to drive fluorescent tube 26 starts;
Square wave controller 28 receives the controlling signal of being exported by current sense device 27 by the wide control pin of ripple position 281, and be used for adjusting the output signal of square wave switch 22 after judgment processing.
See also Fig. 3, the second enforcement Organization Chart of the lamp tube driver with open circuit voltage control is provided for the utility model, by among the figure as can be known, the difference of the utility model second embodiment and above-mentioned first embodiment only is, the use of LC resonant circuit will be saved, this square wave switch 22 directly inputs to square-wave signal driving transformer 25, and by the leakage inductance of driving transformer 25 and the stray capacitance of fluorescent tube 26, makes square-wave signal be converted to string ripple signal and promote fluorescent tube 26 starts.
See also Fig. 4, be that the circuit of the utility model current sense device is implemented schematic diagram, by among the figure as can be known, the circuit working principle of this current sense device is:
1, when lamp works just often
A. transformer T
ACan produce electric current I
A, and through resistance R
AProduce voltage V
AIn like manner, transformer T
BCan produce electric current I
B, and through resistance R
BProduce voltage V
B
B. voltage V
ACan make switch Q
AConducting, and voltage V
BThen can make switch Q
BConducting;
C. because switch Q
AAnd switch Q
BConducting simultaneously makes voltage V
CThe position brigadier be lower than reference voltage V-1, by comparator U
1Relatively, give the wide control pin of the ripple position of square wave controller with not exporting any controlling signal;
D. lamp tube driver is with normal start, and at this moment, product is also with normal operation.
2. when lamp works is opened a way unusually
A. if fluorescent tube L
1When unusual, transformer T then
ATo can not produce electric current I
ASo, no-voltage V
AProduce;
B. because there is not voltage V
A, so switch Q
AWith not conducting, reference voltage V-2 will continue capacitor C this moment
1Charging, voltage V at this moment
CThe position brigadier rises gradually;
C. treat voltage V
CPosition standard when being higher than reference voltage V-1, by comparator U
1Relatively, the output controlling signal is given the wide control pin of the ripple position of square wave controller;
D. lamp tube driver will stop start immediately this moment, not influenced by abnormal condition of lamp tube to guarantee security of products.
See also Fig. 5, be that another circuit of the utility model current sense device is implemented schematic diagram, by among the figure as can be known, this current sense device can be Bo Mine clamp circuit, this circuit working principle is:
1, when lamp works just often
A. transformer T
AWith transformer T
BPhase place opposite, so transformer T
ASecondary side current I
AWith transformer T
BThe addition electric current I of secondary side current IB will be zero;
B. because electric current I is zero, so diode D1 can't conducting, this moment voltage V
CA position brigadier be lower than reference voltage V-1, by comparator U1 relatively after, will not export any controlling signal give the wide control pin of the ripple position of square wave controller;
C. lamp tube driver is with normal start, and at this moment, product is also with normal operation.
2, when lamp works is opened a way unusually
A. if fluorescent tube L1 is when unusual, transformer T then
ATo can not produce electric current I
ASo transformer T
ASecondary side current I
AWith transformer T
BSecondary side current I
BThe addition electric current I with non-vanishing;
B. because electric current I is non-vanishing, so diode D1 is conducting, and continues capacitor C 1 charging, this moment voltage V
CThe position brigadier rise gradually;
C. treat voltage V
CPosition standard when being higher than reference voltage V-1, by comparator U1 relatively after, will the output controlling signal give the wide control pin of the ripple position of square wave controller;
D. lamp tube driver will stop start immediately this moment, not influenced by abnormal condition of lamp tube to guarantee security of products.
Above-listed detailed description is at the specifying of the utility model possible embodiments, and this embodiment is not in order to limiting claim of the present utility model, does not allly break away from the equivalence that the utility model does and implements or change, all should be contained in the claim of this case.
Claims (7)
1. one kind has open circuit voltage control lamp tube driver, it is characterized in that, comprising:
DC power supply provides dc signal to the square wave switch;
The square wave switch with the dc signal that DC power supply is imported, exports the LC resonant circuit to after converting square-wave signal to; But the controlling signal of reciever wave controller is controlled the size of output square-wave signal with this simultaneously;
The LC resonant circuit with the square-wave signal that the square wave switch is imported, exports driving transformer to after converting string ripple signal to again;
Driving transformer is changed the string ripple signal of input, and output drives the fluorescent tube start again;
The current sense device is arranged between driving transformer secondary side and square wave controller, and whether will be used for detecting the fluorescent tube running unusual, and is unusual if fluorescent tube takes place, and then exports controlling signal to the wide control pin of the ripple of square wave controller position;
The square wave controller receives the controlling signal of being exported by the current sense device by the wide control pin of ripple position, and be used for adjusting the output signal of square wave switch after judgment processing.
2, the lamp tube driver with open circuit voltage control as claimed in claim 1, it is characterized in that: described LC resonant circuit is made up of inductance element and capacity cell.
3. the lamp tube driver with open circuit voltage control as claimed in claim 2, it is characterized in that: also include switch element and comparator, whether described current sense device is detected flow through Circuit Fault on Secondary Transformer and lamp tube current by switch element normal, if fluorescent tube takes place unusual, then make corresponding switch element open circuit, the electric current of the switch element of flowing through is originally changed to charge to capacity cell, when the voltage for the treatment of capacity cell surpasses the reference voltage of comparator, comparator will be exported controlling signal to the square wave controller.
4. the lamp tube driver with open circuit voltage control as claimed in claim 2, it is characterized in that: each Circuit Fault on Secondary Transformer and the lamp tube current design of will flowing through of described current sense device adds up to zero, therefore will there be the electric current Bo Mine clamp circuit of flowing through, if fluorescent tube takes place unusual, the Circuit Fault on Secondary Transformer of then flowing through and lamp tube current addition are with non-vanishing, this moment, electric current charged the capacity cell in the Shi Bo Mine clamp circuit, when the voltage for the treatment of capacity cell surpasses the reference voltage of comparator, comparator will be exported controlling signal to the square wave controller.
5. the lamp tube driver with open circuit voltage control is characterized in that, comprising:
DC power supply provides dc signal to the square wave switch;
The square wave switch with the dc signal that DC power supply is imported, exports driving transformer to after converting square-wave signal to; But the controlling signal of reciever wave controller is controlled the size of output square-wave signal with this simultaneously;
Driving transformer by leakage inductance and fluorescent tube stray capacitance, makes the input square wave be convertible into string ripple signal, and output drives the fluorescent tube start again;
The current sense device is arranged between driving transformer secondary side and square wave controller, and whether be used for detecting the fluorescent tube running unusual, and is unusual if fluorescent tube takes place, and then exports controlling signal to the wide control pin of the ripple of square wave controller position;
The square wave controller receives the controlling signal of being exported by the current sense device by the wide control pin of ripple position, and be used for adjusting the output signal of square wave switch after judgment processing.
6. the lamp tube driver with open circuit voltage control as claimed in claim 5, it is characterized in that: also include switch element and comparator, whether described current sense device is detected flow through Circuit Fault on Secondary Transformer and lamp tube current by switch element normal, if fluorescent tube takes place unusual, then make corresponding switch element open circuit, the electric current of the switch element of flowing through is originally changed to charge to capacity cell, when the voltage for the treatment of capacity cell surpasses the reference voltage of comparator, comparator will be exported controlling signal to the square wave controller.
7. the lamp tube driver with open circuit voltage control as claimed in claim 5, it is characterized in that: described current sense device, each Circuit Fault on Secondary Transformer and the lamp tube current of will flowing through design adds up to zero, therefore will there be the electric current Bo Mine clamp circuit of flowing through, if fluorescent tube takes place unusual, the Circuit Fault on Secondary Transformer of then flowing through and lamp tube current addition are with non-vanishing, this moment, electric current charged the capacity cell in the Shi Bo Mine clamp circuit, when the voltage for the treatment of capacity cell surpasses the reference voltage of comparator, comparator will be exported controlling signal to the square wave controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201465123U CN201414255Y (en) | 2009-04-14 | 2009-04-14 | Light tube driving device with open circuit voltage control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201465123U CN201414255Y (en) | 2009-04-14 | 2009-04-14 | Light tube driving device with open circuit voltage control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201414255Y true CN201414255Y (en) | 2010-02-24 |
Family
ID=41716133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201465123U Ceased CN201414255Y (en) | 2009-04-14 | 2009-04-14 | Light tube driving device with open circuit voltage control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201414255Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102760412A (en) * | 2011-04-26 | 2012-10-31 | 佛山市南海平板显示技术中心 | Piezoelectric transformer drive circuit |
| CN102760413A (en) * | 2011-04-26 | 2012-10-31 | 佛山市南海平板显示技术中心 | Piezoelectric transformer drive circuit |
| CN102760411A (en) * | 2011-04-26 | 2012-10-31 | 佛山市南海平板显示技术中心 | Piezoelectric transformer drive circuit |
-
2009
- 2009-04-14 CN CN2009201465123U patent/CN201414255Y/en not_active Ceased
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102760412A (en) * | 2011-04-26 | 2012-10-31 | 佛山市南海平板显示技术中心 | Piezoelectric transformer drive circuit |
| CN102760413A (en) * | 2011-04-26 | 2012-10-31 | 佛山市南海平板显示技术中心 | Piezoelectric transformer drive circuit |
| CN102760411A (en) * | 2011-04-26 | 2012-10-31 | 佛山市南海平板显示技术中心 | Piezoelectric transformer drive circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102520304B (en) | Short-circuit detection circuit and detection method for devices | |
| CN103021346B (en) | A kind of LED backlight drive circuit, driving method and liquid crystal indicator | |
| CN201466775U (en) | Storage battery charging and discharging device | |
| CN101541117B (en) | Electronic device with function of LED illumination control and control method thereof | |
| CN201724988U (en) | Input phase failure detector for power unit of high-voltage frequency converter | |
| CN101604853A (en) | Battery charge and discharge device | |
| CN103634997B (en) | The detection protective circuit of LED drive chip output short-circuit and method thereof | |
| CN102647008A (en) | Automatic tracking type intelligently-managed photovoltaic power supply system | |
| CN102222904A (en) | Direct-current dual-circuit power supply for supplying power | |
| CN201414255Y (en) | Light tube driving device with open circuit voltage control | |
| CN203104386U (en) | Current-limiting protection circuit for electronic switch | |
| CN104900926B (en) | A kind of high-frequency resonance formula lead-acid accumulator prosthetic device and method | |
| CN1913280A (en) | Multiple-in-one charger for batteries | |
| CN204407987U (en) | A kind of reparation formula pulse charger | |
| CN103825471A (en) | Frequency-variable power source for driving small or medium-sized magnetostrictive transducer | |
| CN103151000A (en) | Backlight driving circuit and driving method thereof and liquid crystal display device | |
| CN103021344B (en) | A kind of backlight drive circuit, backlight module and liquid crystal indicator | |
| CN205584019U (en) | Power switching circuit | |
| CN204304446U (en) | The quick harmonics restraint reactive power compensator of a kind of intelligent integrated formula | |
| CN101154814A (en) | Electric energy feedback type reactive-load self-compensation method and apparatus | |
| CN106059044A (en) | Off-grid photovoltaic integrated machine | |
| CN206533586U (en) | Block switch brightness adjustment control drive circuit with LED open-circuit-protections | |
| CN202059624U (en) | Structure of LED tube protective circuit | |
| CN202364427U (en) | Switching dimming LED drive circuit and LED lamp set | |
| CN102231573A (en) | Energy supply power source suitable for small current online power acquisition |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C35 | Partial or whole invalidation of patent or utility model | ||
| IW01 | Full invalidation of patent right |
Decision date of declaring invalidation: 20130403 Decision number of declaring invalidation: 20326 Granted publication date: 20100224 |