CN2595124Y - Semibridge inverting low voltage D.C. fluorescent light circuit device - Google Patents
Semibridge inverting low voltage D.C. fluorescent light circuit device Download PDFInfo
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- CN2595124Y CN2595124Y CN 03214907 CN03214907U CN2595124Y CN 2595124 Y CN2595124 Y CN 2595124Y CN 03214907 CN03214907 CN 03214907 CN 03214907 U CN03214907 U CN 03214907U CN 2595124 Y CN2595124 Y CN 2595124Y
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Abstract
The utility model discloses a half-bridge inverting low-voltage DC fluorescent lamp circuit device. The utility model comprises a power supply protection circuit, a drive circuit, a half-bridge oscillating circuit, a power transmission and voltage boost circuit, and a load circuit, wherein, the input of the power supply protection circuit is connected to a DC power supply, and the output of the power supply protection circuit is connected to the input of the drive circuit; the output of the drive circuit is connected to the input of the half-bridge oscillating circuit; the output of the half-bridge oscillating circuit is connected to the input of the power transmission and voltage boost circuit; induction signals of the power transmission and voltage boost circuit are connected to the drive circuit in a feedback connection mode; the output of the power transmission and voltage boost circuit is connected to the input of the load circuit; a fluorescent lamp tube is connected to the load circuit. After the circuit device is adopted, the starting state of the fluorescent lamp tube can become better, so that the service life of the fluorescent lamp can be prolonged; the switching time of the fluorescent lamp tube can be about three times of that of a fluorescent lamp tube which adopts the original art, and the service life of the fluorescent lamp tube which adopts the utility model can reach more than 8000 hours.
Description
Technical field
The utility model belongs to lighting technical field, particularly relates to a kind of semi-bridge inversion formula low-voltage direct fluorescent lamp circuit device.
Background technology
Fluorescent lamp is a kind of have high light flux, high-luminous-efficiency, and the light source of characteristics such as long-life, fluorescent lamp enjoys people to favor because of the characteristics that it had, and no matter is that fluorescent lamp is applied to various occasions more and more in large-scale public place or in small-sized family room.Fluorescent lamp has limited its use in the sine wave alternating current occasion can not be provided because the power supply that adopted is a sine wave alternating current, as out of doors, the first-class occasion of car, just can not use; In order to enlarge the scope of application of fluorescent lamp, usually adopt now flyback or push off formula inversion circuit and realize the DC-AC conversion, realize the conversion of dc low-voltage, make fluorescent lamp can adopt DC power supply to power, to be applicable to the use of direct current supply occasion to high-frequency and high-voltage.But the flyback of prior art or push off formula inversion circuit and realizing by dc low-voltage in the transfer process of high-frequency and high-voltage is bad because of its starting state, and then influences its useful life.
The utility model content
The purpose of this utility model is to overcome the deficiency of prior art, provide a kind of adopt semibridge system inversion circuit realize dc low-voltage to the conversion of high-frequency and high-voltage with the raising fluorescent tube semi-bridge inversion formula low-voltage direct fluorescent lamp circuit device in useful life.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of semi-bridge inversion formula low-voltage direct fluorescent lamp circuit device, and it comprises:
One power protecting circuit, the influence that power supply and circuit are caused that is produced when its role is to prevent the power positive cathode misconnection, and prevent the impact of oscillator circuit to power supply;
One drive circuit its role is to the half-bridge oscillation circuit output drive signal;
One half-bridge oscillation circuit its role is to produce an ac signal that is similar to sine wave and exports to power delivery and booster circuit;
One power delivery and booster circuit its role is to carry out the transmission of power and voltage are raise, and also output stage and low pressure oscillator circuit are kept apart simultaneously;
One load circuit its role is to the high voltage deactivation fluorescent lamp by the series resonance generation of circuit, and utilizes the variation of fluorescent lamp starting front and back impedance operator to make it stable work;
The input of power protecting circuit is connected to dc power supply; the output of power protecting circuit is connected to the input of drive circuit; the output of drive circuit is connected to the input of half-bridge oscillation circuit; the output of half-bridge oscillation circuit is connected to the input of power delivery and booster circuit; the induced signal feedback of power delivery and booster circuit is connected to drive circuit; the output of power delivery and booster circuit is connected to the input of load circuit, is connected to fluorescent tube in the load circuit.
Described power protecting circuit is made up of protective tube F1, diode D1, capacitor C 1, and wherein dc power anode links to each other through protective tube F1 and Schottky diode D1 positive pole.
Described drive circuit is made up of resistance R 1, R2, R3, diode D2, D3, capacitor C 2, inductance L 1, transformer T1 winding N3, and wherein R1 links to each other with the grid of N-channel MOS field effect transistor Q1.
Described half-bridge oscillation circuit is made up of field effect transistor Q1, Q2, capacitor C 3, C4.
Described power delivery and booster circuit are made up of winding N1, the winding N2 of transformer T1.
Described load circuit is made up of inductance L 2, capacitor C 5, C6, fluorescent tube.
The beneficial effects of the utility model are, because the influence that power supply and circuit are caused that is produced when having adopted power protecting circuit to prevent the power positive cathode misconnection, and prevent the impact of oscillator circuit to power supply; Adopted drive circuit to produce drive signal; Adopted half-bridge oscillation circuit to be similar to sinusoidal wave ac signal output; Adopted power delivery and booster circuit to carry out the transmission of power and voltage has been raise, also output stage and low pressure oscillator circuit have been kept apart simultaneously; Adopt the high voltage deactivation fluorescent lamp of the series resonance generation of load circuit, and utilized the variation of fluorescent lamp starting front and back impedance operator to make it stable work.This circuit arrangement makes the starting state of fluorescent tube better, and prolong the useful life of fluorescent tube greatly, and its switch number of times is about about 3 times that adopt original technology, reaches useful life more than 8000 hours.The utility model be a kind of adopt semibridge system inversion circuit realize dc low-voltage to the conversion of high-frequency and high-voltage with the raising fluorescent tube semi-bridge inversion formula low-voltage direct fluorescent lamp circuit device in useful life.
Description of drawings
Below in conjunction with drawings and Examples the utility model is described in further detail; But semi-bridge inversion formula low-voltage direct fluorescent lamp circuit device of the present utility model is not limited to embodiment.
Fig. 1 is a structured flowchart of the present utility model;
Fig. 2 is a circuit diagram of the present utility model.
Embodiment
Shown in accompanying drawing; semi-bridge inversion formula low-voltage direct fluorescent lamp circuit device of the present utility model; it comprises: power protecting circuit 1; drive circuit 2; half-bridge oscillation circuit 3; power delivery and booster circuit 4; load circuit 5; wherein the input of power protecting circuit 1 is connected to dc power supply; the output of power protecting circuit 1 is connected to the input of drive circuit 2; the output of drive circuit 2 is connected to the input of half-bridge oscillation circuit 3; the output of half-bridge oscillation circuit 3 is connected to the input of power delivery and booster circuit 4; the induced signal feedback of power delivery and booster circuit 4 is connected to drive circuit 2; the output of power delivery and booster circuit 4 is connected to the input of load circuit 5, is connected to fluorescent tube 51 in the load circuit 5.
Power protecting circuit 1 is made up of protective tube F1, diode D1, capacitor C 1, and wherein dc power anode links to each other through protective tube F1 and Schottky diode D1 positive pole; Drive circuit 2 is made up of resistance R 1, R2, R3, diode D2, D3, capacitor C 2, inductance L 1, transformer T1 winding N3, and wherein R1 links to each other with the grid of N-channel MOS field effect transistor Q1; Half-bridge oscillation circuit 3 is made up of field effect transistor Q1, Q2, capacitor C 3, C4; Power delivery and booster circuit 4 are made up of winding N1, the winding N2 of transformer T1; Load circuit is made up of inductance L 2, capacitor C 5, C6, fluorescent tube.
In actual use; insert dc power supply; power supply signal produces in half-bridge oscillation circuit 3 via protective circuit 1, drive circuit 2 backs has the sinusoidal wave signal output of being similar to of positive and negative half cycle; this signal amplifies by power delivery and booster circuit 4; after load circuit 5 is carried in the two poles of the earth of fluorescent lamp, make fluorescent lamp shinny.In circuit, dc power anode links to each other through protective tube F1 and Schottky diode D1 positive pole, the effect of D1 is that power positive cathode connects and inverse time power supply and circuit is protected, and electrolytic capacitor filter C1 can reduce the influence of external voltage fluctuation to circuit, can absorb the impact of oscillator circuit to power supply simultaneously; R1 links to each other with the grid of N-channel MOS field effect transistor Q1, for providing a triggering signal, Q1 makes at first conducting of Q1, the N3 winding of transformer T1, L1, C2 form self-oscillation driving network, R2 plays metering function, L1, C2 play frequency-selecting effect and quasi-resonance effect, voltage stabilizing didoe D2, D3 prevent too high voltages damage Q1, Q2 to the grid source VGS clamper of P-channel field-effect transistor (PEFT) pipe Q2 and Q1; During half-bridge circuit Q1 conducting, C3 discharges by Q1, and C4 charges by Q1, and the flow through N1 winding of T1 of electric current produces positive half cycle induced voltage at the N2 winding; During half-bridge circuit Q2 conducting, C3 charges by Q2, and C4 discharges by Q2, and the sense of current of the winding N1 that flows through is opposite during just with the Q1 conducting, produces the negative half period induced voltage at the N2 winding, obtains a complete periodic voltage signal on winding N2; Transformer T1 also keeps apart output stage and low pressure oscillator circuit except playing the power transfer effect; Output loop adopts the series parallel resonance load circuit, can lean on the high voltage of the series resonance generation of circuit to start fluorescent lamp, and utilizes the variation of fluorescent lamp starting front and back impedance operator to make it stable work; In the circuit added series capacitance C5 the startup stage participate in resonance and make resonance be easy to set up fluorescent tube is punctured, starting the back also can be worth unbalanced weber in the cancellation inverter output signal, cause the not quite identical influence that causes of output voltage positive-negative half-cycle because of device is inconsistent in the balancing half-bridge formula inverter, this point effect when supply voltage is low is particularly outstanding.
Claims (6)
1. semi-bridge inversion formula low-voltage direct fluorescent lamp circuit device; it is characterized in that: it comprises power protecting circuit; drive circuit; half-bridge oscillation circuit; power delivery and booster circuit; load circuit; the input of power protecting circuit is connected to dc power supply; the output of power protecting circuit is connected to the input of drive circuit; the output of drive circuit is connected to the input of half-bridge oscillation circuit; the output of half-bridge oscillation circuit is connected to the input of power delivery and booster circuit; the induced signal feedback of power delivery and booster circuit is connected to drive circuit; the output of power delivery and booster circuit is connected to the input of load circuit, is connected to fluorescent tube in the load circuit.
2. semi-bridge inversion formula low-voltage direct fluorescent lamp circuit device according to claim 1; it is characterized in that: described power protecting circuit is made up of protective tube F1, diode D1, capacitor C 1, and wherein dc power anode links to each other through protective tube F1 and Schottky diode D1 positive pole.
3. semi-bridge inversion formula low-voltage direct fluorescent lamp circuit device according to claim 1, it is characterized in that: described drive circuit is made up of resistance R 1, R2, R3, diode D2, D3, capacitor C 2, inductance L 1, transformer T1 winding N3, and wherein R1 links to each other with the grid of N-channel MOS field effect transistor Q1.
4. semi-bridge inversion formula low-voltage direct fluorescent lamp circuit device according to claim 1, it is characterized in that: described half-bridge oscillation circuit is made up of field effect transistor Q1, Q2, capacitor C 3, C4.
5. semi-bridge inversion formula low-voltage direct fluorescent lamp circuit device according to claim 1, it is characterized in that: described power delivery and booster circuit are made up of winding N1, the winding N2 of transformer T1.
6. semi-bridge inversion formula low-voltage direct fluorescent lamp circuit device according to claim 1, it is characterized in that: described load circuit is made up of inductance L 2, capacitor C 5, C6, fluorescent tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03214907 CN2595124Y (en) | 2003-01-22 | 2003-01-22 | Semibridge inverting low voltage D.C. fluorescent light circuit device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03214907 CN2595124Y (en) | 2003-01-22 | 2003-01-22 | Semibridge inverting low voltage D.C. fluorescent light circuit device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2595124Y true CN2595124Y (en) | 2003-12-24 |
Family
ID=33754898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03214907 Expired - Lifetime CN2595124Y (en) | 2003-01-22 | 2003-01-22 | Semibridge inverting low voltage D.C. fluorescent light circuit device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2595124Y (en) |
-
2003
- 2003-01-22 CN CN 03214907 patent/CN2595124Y/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130122 Granted publication date: 20031224 |