CN2266253Y - DC drive for fluorescent lamp - Google Patents
DC drive for fluorescent lamp Download PDFInfo
- Publication number
- CN2266253Y CN2266253Y CN 96216503 CN96216503U CN2266253Y CN 2266253 Y CN2266253 Y CN 2266253Y CN 96216503 CN96216503 CN 96216503 CN 96216503 U CN96216503 U CN 96216503U CN 2266253 Y CN2266253 Y CN 2266253Y
- Authority
- CN
- China
- Prior art keywords
- electronic switch
- circuit
- triode
- switch control
- control 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.)
- Expired - Fee Related
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- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
The utility model provides a DC drive for a fluorescent lamp. An electronic switch is arranged in an energy conversion circuit (5). The control end of the electronic switch is connected to an electronic switch control circuit (3). The signal input end of the electronic switch control circuit is connected with a leading current testing circuit (2). The method that the leading time of the electronic switch, the end time of the electronic switch and the maximum current of the energy conversion circuit are all controlled controls output power to keep basically unchangeable when an input voltage changes in a larger variation range around a normal voltage. The utility model overcomes the shortage that the former DC drive for the fluorescent lamp can not be suitable for the occasion that the variation range of power supply is wider.
Description
The utility model relates to a kind of fluorescent lamp direct-current driving device, what work in low-voltage dc power supply exactly provides the device of operating current for fluorescent lamp.
Introduce according to " electronic circuit encyclopedia " that Science Press published in 1992, the fluorescent lamp drive circuit that is applied to means of transportation such as boats and ships, vehicle and family etc. and with the low-voltage dc power supply is the energy is made of multivibrator circuit, square being directly proportional of its power output (supplying with the power of fluorescent lamp) and supply power voltage.This fluorescent lamp direct-current driving device, input voltage can cause fluorescent tube not work (power output is not enough) when load voltage value changes up and down or fluorescent tube is crossed bright damage (power output is too high), thereby can not be applicable to the occasion of power supply voltage variation wider range.
At this defective, the purpose of this utility model is exactly that a kind of supply voltage constant substantially fluorescent lamp direct-current driving device of its power output when rated voltage changes up and down by a relatively large margin will be provided.
Fluorescent direct-current driving device provided by the utility model, one transducing transformer (B) is arranged on its energy conversion circuit (5), the secondary coil of transducing transformer connects the two poles of the earth of fluorescent lamp (L), on the energy conversion circuit, also have an electronic switch to connect with the primary coil of transducing transformer, the control end of electronic switch connects electronic switch control circuit (3), and the signal input part of electronic switch control circuit connects conducting current detection circuit (2).Detect input voltage through the length of the make-and-break time of electronic switch control electronic switch power output by the conducting current detection circuit like this with the control energy translation circuit.
Fluorescent lamp direct-current driving device provided by the utility model, its electronic switch control circuit (3) are that a triode (T is arranged
3), its collector electrode connects the control end of the electronic switch of energy conversion circuit (5), to control its break-make.Triode (T
3) grounded emitter.Triode (T
3) base stage is connected with the charging and discharging circuit that an electric capacity and resistance are formed.The signal input part of electronic switch control circuit electric capacity (C in this charging and discharging circuit
4) an end draw.Wherein electronic switch can be field effect transistor (T
4) or compound transistor.Its conducting current detection circuit (2) is by the detection resistance (R that is serially connected with energy conversion circuit (5)
P) and base stage and emitter be connected on the triode (T of these resistance two ends
2) form.Triode (T
2) collector electrode connect the signal input part of electronic switch control circuit (3).The pressure drop that detects resistance two ends is greater than triode (T
2) conducting voltage the time this triode conducting, and charging current is provided and makes triode (T in the electronic switch control circuit (3) to this charging and discharging circuit by collector electrode
3) saturated and turn-off electronic switch.Work as the charging and discharging circuit discharge subsequently up to triode (T
3) base voltage when being lower than its conducting voltage, this triode ends, electronic switch reopens.
Fluorescent lamp direct-current driving device provided by the utility model also has this circuit of acceleration auxiliary circuit (4) that one triode (T is arranged
1), charge and discharge electric capacity (C in the circuit loop in its collector electrode and the electronic switch control circuit (3)
4) the other end link to each other grounded emitter, the middle triode (T of base stage and electronic switch control circuit (3)
3) collector electrode through a resistance (R
1) link to each other.Quicken auxiliary circuit by triode (T
1) base stage and the triode (T of electronic switch control circuit (3)
3) collector electrode links to each other and to change with the break-make that detects electronic switch controling end, and utilize voltage can not suddenly change on the electric capacity principle by means of triode (T by collector electrode
3) positive feedback accelerating circuit of formation.
The fluorescent lamp direct-current driving device that provides of the present utility model, wherein electronic switch control circuit and acceleration auxiliary circuit can be to hold mutually.Triode (T in the electronic switch control circuit (3)
3) base stage and triode (T
1) collector electrode through a resistance (R
8) link to each other triode (T
1) base stage be connected with one by electric capacity (C
4) and the charging and discharging circuit that constitutes of resistance, the signal input part of electronic switch control circuit is at triode (T
1) base stage draw.Triode (T
1) grounded emitter.
The fluorescent lamp direct-current driving device that the utility model provides adopts the time to chopping of controlling electronic switch, and the maximum current of controlling electronic switch ON time and energy conversion circuit simultaneously again makes power output reach stable.
Describe the operation principle of fluorescent lamp direct-current driving device below more in conjunction with the embodiments in detail.
Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 is the circuit diagram of this practical embodiment;
Fig. 3 is the circuit diagram of this another practical embodiment;
Fig. 4 is the circuit diagram of the third embodiment of the utility model.
1-power supply auxiliary circuit among the figure, 2-conducting current detection circuit, 3-electronic switch control circuit, 4-acceleration auxiliary circuit, 5-energy conversion circuit.
B-transducing transformer, BX-fusible link, C
1, C
2, C
3, C
4, C
5, C
6, C
8, C
9, C
10-electric capacity, D
1～D
4The bridge rectifier that-diode is formed, D
5, D
6, D
7, D
8-diode, L-fluorescent lamp, R
1, R
2, R
3, R
4, R
5, R
6, R
7, R
8, R
9, R
10, R
11, R
12, R
13, R
P-resistance, T
1, T
2, T
3, T
5, T
6-triode, T
4-field effect transistor, U-power supply.
Embodiment 1: by as shown in Figure 2, each element is installed on circuit board, electronic switch is selected field effect transistor (T for use
4).A whole set of circuit is installed in the fluorescent lamp housing.When energized, the bridge circuit (D that diode is formed
1～D
4) will differentiate the positive-negative polarity of power supply automatically, make circuit keep correct power supply input polarity.Power supply is by resistance (R
1And R
6, R
2) dividing potential drop make field effect transistor (T as electronic switch
4) grid become high level, make its conducting, simultaneously triode (T
1) also conducting.Field effect transistor (T
4) after the conducting, power supply is through resistance (R
P) and transformer (B) primary coil by field effect transistor (T
4) source-drain electrode constitute the loop, the transformer of flowing through (B) the just electric current of polar curve circle increases fast and also is the transformer energy storage.When being increased to it, electric current detecting resistance (R
P) go up pressure drop greater than triode (T
2) conducting voltage the time, triode (T
1) conducting, power supply is through triode (T
2) collector electrode adds to electric capacity (C
4) and resistance (R
4) tie point, on the one hand by (C
4) and be in the triode (T of saturation condition
1) quick charge, on the other hand through resistance (R
4) make triode (T
3) conducting.Triode (T
3) fet gate voltage is descended, make simultaneously and quicken triode (T
1) make triode (T by the saturated magnifying state that enters
1, T
3) constitute positive feedback, thus make triode (T rapidly
3) saturated field effect transistor (T
4) end.Field effect transistor (T
4) end after, the energy that is stored in transformer produces high pressure by secondary coil and discharges to fluorescent lamp (L), makes fluorescent lamp lighting, simultaneously because resistance (the R that flows through
P) electrorheological zero, triode (T then
2) enter cut-off state.Triode (T
2) end after, power supply is by resistance (R
3), electric capacity (C
4) and resistance (R
4, R
5) and triode (T
3) the loop that constitutes of base stage to electric capacity (C
4) reverse charging, so electric capacity (C
4), resistance (R
4) voltage of link descends, and finally makes triode (T
3) withdraw from saturation condition.At this moment triode (T
3) the collector voltage rising, make triode (T
1) enter magnifying state, so triode (T
1And T
3) positive feedback loop that constitutes makes triode (T
3) end triode (T
1) saturated, supply voltage (U) is through (R
1) add to field effect transistor (T
4) grid make its conducting, restart the process of new round energy storage, release.Because electric capacity (C
4) and resistance (R
4) voltage of link is at triode (T
3) voltage under the conducting situation presses
Rule descend U wherein
OBe input voltage, n is a proportionality constant, and τ is the loop time constant, and t is the time.Therefore as input voltage U
OIncrease or when reducing electric capacity (C
4), resistance (R
4) voltage of link is from nU
ODrop to and make triode break away from the saturated required time of voltage to prolong thereupon or shortens, thus prolongation field effect transistor (T when reaching input voltage and rising
4) the purpose of deadline.In addition, because resistance (R
P) and triode (T
2) detection control, in fact limited maximum current by transducing transformer (B) primary coil.Because electric current is approximate by U
O/ L
BSlope increase (U wherein
OBe input voltage, L
BEquivalent electric sensibility reciprocal for transformer), therefore the electric current by transformer shortened from the zero time that increases to the qualification maximum current when input voltage rises, to increase to the time that limits maximum current from zero elongated for electric current when otherwise input voltage descended, and shortens field effect transistor (T when input voltage rises thereby reach
4) purpose of ON time.Thereby the controlling filed effect combines by the maximum conducting electric current of ON time and control transformer primary coil and reaches the purpose of stablizing power output.
Embodiment 2, by circuit diagram as shown in Figure 3, each class component are installed in the circuit board, and electronic switch is selected field effect transistor (T for use
4), triode (T
6) effect be in order to improve field effect transistor (T
4) conduction property.
Embodiment 3, by as the circuit diagram that Fig. 4 put, each class component are installed at circuit on extremely, and electronic switch is selected field effect transistor (T for use
4).
Claims (4)
1, a kind of fluorescent lamp direct-current driving device, one transducing transformer (B) is arranged on its energy conversion circuit (5), the secondary coil of transducing transformer connects the two poles of the earth of fluorescent tube, it is characterized in that also having on the energy conversion circuit electronic switch to connect with the primary coil of transducing transformer, the control end of electronic switch connects electronic switch control circuit (3), and the signal input part of electronic switch control circuit connects conducting current detection circuit (2).
2, fluorescent lamp direct-current driving device as claimed in claim 1 is characterized in that electronic switch control circuit (3) is that a triode (T is arranged
3) its collector electrode connects the control end of the electronic switch of energy conversion circuit (5), grounded emitter, and its base stage is connected with one with electric capacity (C
4) and the charging and discharging circuit that constitutes of resistance, the signal input part of electronic switch control circuit electric capacity (C in this charging and discharging circuit
4) an end draw;
Conducting current detection circuit (2) is the detection resistance (R that is serially connected with energy conversion circuit (5) by
P) and base stage and emitter be connected on the triode (T of these resistance two ends
2) form triode (T
2) collector electrode connect the signal input part of electronic switch control circuit (3).
3, fluorescent lamp direct-current driving device as claimed in claim 1 or 2 is characterized in that also having one to quicken auxiliary circuit (4), and this circuit has a triode (T
1) its collector electrode and the interior electric capacity (C of the middle charging and discharging circuit of electronic switch control circuit (3)
4) the other end link to each other grounded emitter, the middle triode (T of base stage and electronic switch control circuit (3)
3) collector electrode through resistance (R
2) link to each other.
4, fluorescent lamp direct-current driving device as claimed in claim 1, straight feature is that electronic switch control circuit (3) is that a triode (T is arranged
3) its collector electrode connects the control end of the electronic switch of energy conversion circuit (5), grounded emitter, and its base stage and a triode (T
1) collector electrode through a resistance (R
9) link to each other triode (T
1) base stage be connected with one by electric capacity (C
4) and the charging and discharging circuit that constitutes of resistance, the signal input part of electronic switch control circuit is from triode (T
1) base stage draw triode (T
1) grounded emitter;
Conducting current detection circuit (2) is the detection resistance (R that is serially connected with energy conversion circuit (5) by
P) and base stage and emitter be connected on the triode (T at these resistance two ends
2) form triode (T
2) collector electrode connect the signal input part of electronic switch control circuit (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96216503 CN2266253Y (en) | 1996-06-24 | 1996-06-24 | DC drive for fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96216503 CN2266253Y (en) | 1996-06-24 | 1996-06-24 | DC drive for fluorescent lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2266253Y true CN2266253Y (en) | 1997-10-29 |
Family
ID=33897976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96216503 Expired - Fee Related CN2266253Y (en) | 1996-06-24 | 1996-06-24 | DC drive for fluorescent lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2266253Y (en) |
-
1996
- 1996-06-24 CN CN 96216503 patent/CN2266253Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |