CN2373967Y - Rectifying direct power supply type high power factor electronic ballast - Google Patents
Rectifying direct power supply type high power factor electronic ballast Download PDFInfo
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- CN2373967Y CN2373967Y CN 97231719 CN97231719U CN2373967Y CN 2373967 Y CN2373967 Y CN 2373967Y CN 97231719 CN97231719 CN 97231719 CN 97231719 U CN97231719 U CN 97231719U CN 2373967 Y CN2373967 Y CN 2373967Y
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Abstract
The utility model relates to a rectifying direct power supply type high power factor electronic ballast, which is an advanced energy-saving type electronic product. The rectifying direct power supply type high power factor electronic ballast not only has superior technical indexes but also has low manufacturing cost. The utility model is mainly characterized in that pulsating direct current after rectified is divided into two branch circuits; one circuit is used for directly supplying power for a fluorescent lamp tube circuit via a diode (8); the other circuit charges for a capacitor (11) via a diode (9), and provides smooth direct current for power MOS field-effect tubes (or TTL transistors) and associated circuits. The capacitor (11) does not directly participate in the charge and discharge work of a resonance circuit in the fluorescent lamp tube circuit. The key point of the method to realize the characteristics of the circuit is in that the filtering capacitor (11) is connected to the negative end of the diode (9); the positive end of the diode (9) is directly connected to the other end of a filtering inductor (7) directly connected with the output end of a rectification circuit.
Description
The utility model provides a kind of electric ballast by civil power is directly powered to fluorescent tube behind bridge rectifier.Particularly can realize the High Power Factor of circuit by enough simple circuit, and reduce the higher harmonic content in the circuit greatly.
The electric ballast of Xiao Shouing in the market, power factor is generally all about 0.6.The higher harmonic content height of this electron-like ballast, particularly triple-frequency harmonics content is very high.Not only power consumption efficiency is low for this, and can not concentrate use in enormous quantities.As for the existing high power factor electronic ballast of selling in the market, its power factor is also only about 0.9, and triple-frequency harmonics content is also higher, has limited in enormous quantities concentrating equally and has used.The domestic people of having develops and is called the high performance electronic ballast, though this electric ballast has satisfied the specification requirement of using of concentrating in enormous quantities, and the circuit complexity, cost is too high, and market is difficult to accept.
The purpose of this utility model provides a kind of electric ballast, and it not only can realize fluorescent tube is played the ballast effect, and the enough succinct circuit of energy, realizes that the High Power Factor function of circuit also reduces the content of the triple-frequency harmonics in the circuit greatly.It can be concentrated in a large number be used in all places.
The utility model, be achieved by the following technical solution: in the mains circuit, insert LC High frequency filter network, connect then and go up diode bridge rectifier circuit, filter inductance and filter capacitor, connect subsequently and go up two MOS power field effect triodes (or TTL transistor) and the associated circuit of using as electronic switch.After bridge rectifier another branch road is a resonant circuit, the key character of this circuit is: low frequency filtering electric capacity (11) is connected on the negative terminal of diode (9), thereby realized the pulsating direct current after the rectification by diode (8) directly to fluorescent tube circuit power supply, filter capacitor (11) is not then participated in the work that discharges and recharges of frequency changer circuit directly.
Owing to adopted above technical scheme, thereby realized having reached the High Power Factor function of circuit, made the function factor reach 99%, and reduced the triple-frequency harmonics content in the circuit greatly with succinct circuit, make ballast cheap, be easy to produce in batches and concentrate and use.
Below in conjunction with accompanying drawing, the utility model ballast is described further:
Fig. 1 is the basic electrical schematic diagram of the utility model electric ballast.
The circuit of the utility model electric ballast, by LC High frequency filter network, the low-frequency filter circuit after diode bridge rectifier, the rectification, field effect transistor (or TTL transistor), transformer and resonant circuit are formed.Between the bridge rectifier input that mains electricity input end and diode (3)～diode (6) is formed, be connected to LC High frequency filter network inductance (1) and electric capacity (2), and the low-frequency filter circuit of forming by inductance (7) and electric capacity (11) and diode (9) in the output access of bridge rectifier.By forming of the low-frequency filter circuit after from the LC filter network to rectification, realized the High Power Factor function of circuit.In low-frequency filter circuit, insert diode (9) between inductance (7) and the electric capacity (11), be the most important technical characterictic of this circuit.Subsequently, form start-up circuit jointly by resistance (13), diac (15) and electric capacity (16), and two MOS field effect tubes (19), (20) (or TTL transistor) and transformer (25) and inductance (27), electric capacity (26), (28) and relevant element, form frequency-conversion circuit jointly, former 50HZ alternating current is transformed into the high-frequency alternating current of 30KHZ～40KHZ.Pulsating direct current after the rectification is directly powered to fluorescent tube circuit by diode (8).Simultaneously, in the utility model electron rectifier, after diode (8) short circuit and removing diode (10), electric capacity (12) directly is connected on the contact place that inductance (7) is connected with diode (9) anode with the contact that electric capacity (26) is connected, perhaps with behind inductance (7) short circuit, the node that diode (8) is connected with two anodes of diode (9) directly is connected on diode in the rectification circuit (3) and the node that diode (4) two negative terminals are connected, all can realize pulsating direct current after the rectification directly to the High Power Factor function of fluorescent tube circuit power supply, and reduce the higher harmonic content in the circuit greatly.
Fig. 2 is voltage, the current waveform in the input circuit of the utility model electric ballast that is is the voltage μ on the utility model electric ballast input electrical network and the waveform of current i, μ is the voltage waveform of 220V, 50HZ, and i is the current waveform in the electrical network.
Claims (3)
1, a kind of electric ballast, form by the low-frequency filter circuit after LC High frequency filter network, bridge rectifier, the rectification, power MOS field effect triode (or TTL transistor), transformer, resonant circuit and housing (comprising printed circuit board), it is characterized in that: the pulsating direct current after the rectification is divided into two branch roads, one the tunnel through diode (8), are used for fluorescent tube circuit is directly powered; Another Lu Zejing diode (9) is to electric capacity (11) charging, for MOS field effect tube (or TTL transistor) and the circuit that is associated provide level and smooth direct current.And electric capacity (11) is not participated in the work that discharges and recharges of resonant circuit in the fluorescent tube circuit directly, realize the method for this circuit feature, key is the negative terminal that filter capacitor (11) is connected on diode (9), and the anode of diode (9) then directly is connected on the other end of the filter inductance (7) that directly links to each other with rectification circuit output end.
2, electric ballast according to claim 1 is characterized in that: with diode (8) short circuit and after removing diode (10), the contact that electric capacity (12) is connected with electric capacity (26) directly is connected on the contact place that inductance (7) is connected with diode (9) anode.
3, electric ballast according to claim 1 is characterized in that: behind inductance (7) short circuit, the node that diode (8) links to each other with diode (9) two anodes directly is connected on diode in the rectification circuit (3) and the node that diode (4) two negative terminals are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97231719 CN2373967Y (en) | 1997-12-22 | 1997-12-22 | Rectifying direct power supply type high power factor electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97231719 CN2373967Y (en) | 1997-12-22 | 1997-12-22 | Rectifying direct power supply type high power factor electronic ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2373967Y true CN2373967Y (en) | 2000-04-12 |
Family
ID=33943866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97231719 Expired - Fee Related CN2373967Y (en) | 1997-12-22 | 1997-12-22 | Rectifying direct power supply type high power factor electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2373967Y (en) |
-
1997
- 1997-12-22 CN CN 97231719 patent/CN2373967Y/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 |