CN1187749A - Gas discharge lamp ballast with power factor correction - Google Patents
Gas discharge lamp ballast with power factor correction Download PDFInfo
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- CN1187749A CN1187749A CN97123449A CN97123449A CN1187749A CN 1187749 A CN1187749 A CN 1187749A CN 97123449 A CN97123449 A CN 97123449A CN 97123449 A CN97123449 A CN 97123449A CN 1187749 A CN1187749 A CN 1187749A
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Abstract
A gas discharge lamp ballast, includes: a load circuit with discharge lamps; acircuit supplying from an AC voltage to a DC power supply; a DC- AC conversion circuit connecting the load circuit, including a first and a second change-over switch connected in series between DC voltage bus nodes and reference nodes, each of the two switches having control nodes and reference nodes, the voltage betwwen which determines the conductive state of the connected switch; and a boost converter including: a boost capacitor, connected between the bus and the reference nodes; a boost inductance, storing the DC power energy, and putting the energy into the capacitor through a diode; and a boost switch, cyclical charging the inductance through a low impedance circuit. The ballast improvse the correction of the power factor.
Description
The present invention requires the priority of provisional application No.60/033819 (applying date is on December 23rd, 1996).
The present invention relates to a kind of ballast or power circuit, this circuit is powered to gaseous discharge lamp with alternating current, and can improve the correction of power factor.
From No. 5,408,403, the United States Patent (USP) that transfers this assignee as can be known, it has used the ballast that is used for gaseous discharge lamp, and this gaseous discharge lamp comprises the d.c.-a.c. transducer that adopts the pair of series change over switch.Booster circuit is added this ballast to obtain the power factor correction of height.Yet two change over switches all are conductivity types, and for example the two all is the MOSFET of n channel enhancement.
By one of the present inventor, Louis R.Nerone, at the common unsettled and No.08/709 that assigns an application jointly of on September 6th, 1996 application, disclose and required a kind of lamp ballast in 062, comprising the d.c-a.c. transducer of the complementary conductivity type tandem tap of employing.Such as, a switch can be the MOSFET of n channel enhancement, and another is the MOSFET of p channel enhancement.
People wish, in the ballast that comprises the d.c.-a.c. transducer that adopts same conductivity type switch, improve the correction of power factor.
One embodiment of the present of invention have proposed a kind of gas discharge lamp ballast, and this ballast comprises: a load circuit wherein contains and is useful on the circuit that is connected to gaseous discharge lamp; A circuit of supplying with the d.c. power supply from a.c. voltage; A d.c.-a.c. change-over circuit, be connected to load circuit, to generate the a.c. electric current therein, this change-over circuit comprises first and second change over switches, be connected on said sequence between the bus node and reference node of d.c. voltage, and on the common node that the a.c. load current flows through, link together, first and second change over switches respectively have a Control Node and a reference node, voltage between these two nodes has been determined the conduction state of continuous switch, first and second change over switches Control Node separately is connected to each other, is connected first and second change over switches reference node separately on the common node together; A boost converter comprises: be connected the boost capacitor between bus and the reference node, its charging level has been determined the bus voltage on the bus conductor; Boost inductance stores the energy from the d.c. power-supply circuit, by at least one diode this boost inductance is connected to boost capacitor, so as with its energy emission in boost capacitor; Boosted switch periodically is connected to bus node with this boost inductance by low impedance path, thereby to the boost inductance charging, this boosted switch comprises first switch of described change-over circuit.
In the ballast that comprises the d.c-a.c. transducer with same conductivity type switch, the foregoing description has been realized the power factor correction of height.
Fig. 1 is a sketch of obtaining the ballast of low power factor;
Fig. 2 is the current waveform in Fig. 1 boost inductance.
Fig. 1 illustrates the ballast 10 of supply gas discharge lamp 12 power supplys as an example.14 pairs of full-wave rectifiers of power supply 16 are supplied with the a.c. power supply.High-frequency bypass capacitor 18 is used for the electric current that bypass has ballast 10 operating frequencies (opposite with the line frequency of power supply 14).Optional p-n diode 19 makes because the stray voltage that the mutual resonance between the parasitic capacitance (not shown) between the output electrode of boost inductance 50 (below will describe) and switch 20 causes reduces to minimum.
Ballast 10 comprises a d.c.-a.c. transducer, and this transducer comprises the pair of switches 20 and 22 that is connected between bus node 24 and the reference node 26. Switch 20 and 22 preferably comprises the MOSFET of n-raceway groove and p-channel enhancement respectively, and as shown in the figure, their source electrode is connected to each other at common node 28 places.The grid of switch or Control Node are interconnected in Control Node 30 places.
During work, node 28 alternately is connected to bus potential on the node 24 and the reference potential on the node 26.In this way, the load circuit that the a.c. electric current supply is comprised resonant inductance 32, capacitance 33, resonant capacitance 34 and lamp 12.Discussing, the better circuit of the regeneration control operation of switch 20 and 22 is described to before obtaining the used circuit of low power factor.
Regeneration control section ground is provided by driving inductance 36, inductance 38 and the electric capacity 40 with resonant inductance 32 interconnection that indicate polarized spot.Regeneration control is also provided by a network, and this network preferably includes resistance 42, resistance 44 and with resistance 46a shown in the practice or replacement resistance 46b shown in broken lines.In addition, the Zener diode with back-to-back connection is used for regeneration control to 48.When thereby starting a.c. power supply 14 ballasts 10 began to encourage, electric capacity 40 was recharged till switch 22 is connected.Then, supply with driving inductance 38 from resonant inductance 32, make the voltage of Control Node 30 alternately become positive and negative, thereby alternately connect switch 20 and 22 with respect to common node 26 by feedback.
Although preferably resistance 42 and 44 is used for supplying the foregoing circuit of regeneration control, adopt resistance 46a can save resistance 44, adopt resistance 46b can save resistance 42.
Except in described d.c.-a.c. transducer, being used as the boosted switch, can comprise that the boost converter of boost inductance 50, boost capacitor 52 and switch 20 obtains power factor correction by use.During work, if switch 20 conductings, common node 28 rises to the current potential of bus node 24.At this moment, boost inductance 50 conductings are from the electric current of node 28 through p-n diode 54.So, the inductance storage power, electric current continues to flow through when making switch 20 stop conductings.Then, the electric current of the intrinsic p-n diode 22a of switch mosfet 22 is passed through in inductance 50 conductings, or passes through the electric current of optional p-n diode 56, and this electric current is mainly provided by boost capacitor 52.This makes this electric capacity charging, thus increased its voltage, and therefore increased the current potential of bus node 24.
The use of optional p-n diode 56 makes from electric capacity 52 to inductance voltage descends 50 the conductive path p-n number of diodes reduce to and has only one, thereby reduced the loss of storage power in the inductance.
Afterwards, such as, be preferably in p-n diode 22 and begin after inductance 32 or 50 conducting residual currents, switch 22 beginning conductings.This makes the current potential of node 28 drop to the current potential of reference node 26, and the electric current by boost inductance 50 is reduced, and preferably is reduced to " 0 ".
How many energy stored depends on that in the cycle of a.c. power supply 14 which point produces the electric current by this inductance in boost inductance 50.If the peak value place at the a.c. power supply produces, then energy stored is maximum; If near the zero cross point near the a.c. power supply, then energy stored is minimum.
When electric current flows to node 28 from resonant inductance 32, and two switches 20 and 22 are when all turn-offing, and energy stored can make electric current flow into boost inductance 50 through diode 54 and the intrinsic p-n diode 20a by switch 20 in inductance 32.Then, switch 20 beginning conductings make current reversal flow into resonant inductance 32, and increase the electric current that flows into boost inductance 50.
Best, in being transmitted in d.c.-a.c. conversion, also transmit the switch 20 of boost converter electric current the used electric current, than another switch 22 lower conducting resistance is arranged.Realized this requirement in ballast 10, wherein switch 20 (being preferably n-channel enhancement MOSFET) has lower conducting resistance than switch 22 (being preferably p-channel enhancement MOSFET).
Fig. 2 is illustrated in the waveform 60 of electric current in the boost inductance 50 (Fig. 1).Waveform 60 comprises triangle component 60a, 60b, 60c etc., they is separated by time interval 62,64 etc.This expression has the energy storage of discontinuous mode, is desirable for the power factor that increases ballast.Yet the time interval between the component of triangular form in succession on the waveform (not shown) peak value of a.c. power supply 14 can approach even reach zero, and still keeps the discontinuous mode of energy storage.
For 16.5 watts, the fluorescent lamp 12 of the d.c. bus voltage of 330V, the typical component values of ballast 10 is as follows:
Zener diode is right, each 10V
Capacitance 0.22 microfarad
Usually the electric capacity (not shown) with about 5.6 millimicrofarads is connected between node 28 and 30, what is called " zero load " time when cutting off to increase by two switches.Switch 20 can be IRFR310, is by E1 Segundo, the n-channel enhancement MOSFET that the Intemational Rectifier company of California sells; And switch 22 can be IRFR9310, also is the p-channel enhancement MOSFET that is sold by IntemationalRectifier company.
With ballast described here, adopt that a.c. line power supply supplies with 20% or less than the a.c. electric current of 20% total harmonic distortion, obtained power factor greater than 0.95.By optimization,, total harmonic distortion can be reduced to below 13% usually such as 2 to 1 boost.
Although above specific embodiments of the invention are described, those skilled in the art can make many modifications, and therefore, this class that claims have covered in spirit and scope of the invention is revised.
Claims (11)
1. gas discharge lamp ballast comprises:
(a) load circuit has the device that is used to connect gaseous discharge lamp;
(b) be used for from the device of a.c. voltage supply d.c power supply;
(c) d.c.-a.c. change-over circuit is connected to described load circuit, is used for the a.c. electric current of inducting therein, and described change-over circuit comprises:
(i) first and second change over switches are connected between the bus node and reference node on the d.c. voltage with said sequence, and link together on the common node that described a.c. load current passes through;
(ii) described first and second change over switches respectively have a Control Node and a reference node, and the voltage between two nodes has been determined the conducting state of described switch;
(iii) the Control Node separately with described first and second change over switches is connected to each other; With
(iv) the reference node separately with described first and second change over switches links together at described common node place; And
(d) boost converter comprises:
(i) boost capacitor is connected between described bus and the reference node, and its charging level has been determined the bus voltage on described bus conductor;
(ii) boost inductance is used to store the energy from described d.c. electric supply installation, by at least one diode described boost inductance is connected to described boost capacitor, so as with its energy discharge in described boost capacitor;
(iii) boosted switch periodically is connected to described bus node by a low impedance path with described boost inductance, thereby to described boost inductance charging;
(e) described boosted switch comprises described first switch of described change-over circuit.
2. according to the ballast of claim 1, the described second switch of wherein said first on-off ratio has lower conducting resistance.
3. according to the ballast of claim 1, wherein said low impedance path comprises that the permission electric current flows to the p-n diode of described boost inductance from described boosted switch.
4. according to the ballast of claim 1, the operating frequency of the inductance value of wherein said boost inductance and described d.c.-a.c. change-over circuit is chosen to make described boost inductance to pass through the whole cycle of described a.c. power supply all with discontinuous means of energy storage work logical.
5. according to the power supply circuits of claim 1, wherein said d.c.-a c. change-over circuit comprises a regenerative switch control circuit, is used to control the on off state of described first and second switches.
6. according to the power supply circuits of claim 5, wherein said load circuit comprises fluorescent lamp.
7 one kinds of gas discharge lamp ballasts comprise:
(a) load circuit has the device that is used to connect gaseous discharge lamp;
(b) be used for from the device of a.c. voltage supply d.c. power supply;
(c) d.c.-a.c. change-over circuit is connected to described load circuit, is used for the a.c. electric current of inducting therein, and described change-over circuit comprises:
(i) n-channel enhancement the one MOSFET and p-channel enhancement the 2nd MOSFET are linked in sequence between bus node that is in d.c. voltage and reference node with above-mentioned, and their source electrode links together on the common node that flows through described a.c. load current;
(ii) described first and second MOSFET grid separately interconnects; And
(d) boost converter comprises:
(i) boost capacitor is connected between described bus and the reference node, and its charging level has been determined the bus voltage on described bus conductor;
(ii) boost inductance is used to store the energy from described d.c. electric supply installation, by at least one diode described boost inductance is connected to described boost capacitor, so as with its energy discharge in described boost capacitor;
(iii) boosted switch periodically is connected to described bus node by a low impedance path with described boost inductance, thereby to described boost inductance charging;
(e) described boosted switch comprises a described MOSFET.
8. according to the ballast of claim 7, wherein said low impedance path comprises the p-n diode that allows electric current to flow to described boost inductance from described boosted switch.
9. according to the ballast of claim 7, the operating frequency of the inductance value of wherein said boost inductance and described d.c.-a.c. change-over circuit is chosen to make described boost inductance to pass through the whole cycle of described a.c. power supply all with discontinuous means of energy storage work logical.
10. according to the power supply circuits of claim 7, wherein said d.c.-a.c. change-over circuit comprises a regenerative switch control circuit, is used to control the on off state of described first and second MOSFET.
11. according to the power supply circuits of claim 10, wherein said load circuit comprises fluorescent lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97123449A CN1187749A (en) | 1996-12-23 | 1997-12-23 | Gas discharge lamp ballast with power factor correction |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US033819 | 1996-12-23 | ||
| US922203 | 1997-09-02 | ||
| CN97123449A CN1187749A (en) | 1996-12-23 | 1997-12-23 | Gas discharge lamp ballast with power factor correction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1187749A true CN1187749A (en) | 1998-07-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97123449A Pending CN1187749A (en) | 1996-12-23 | 1997-12-23 | Gas discharge lamp ballast with power factor correction |
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| Country | Link |
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| CN (1) | CN1187749A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004042903A1 (en) * | 2002-11-05 | 2004-05-21 | Dafeng Weng | A quasi-active power factor correction circuit for switching power supply |
| CN100380793C (en) * | 2002-03-21 | 2008-04-09 | 电灯专利信托有限公司 | Circuit used for power factor correction |
| CN106888532A (en) * | 2012-09-28 | 2017-06-23 | 奥斯兰姆施尔凡尼亚公司 | Set up the solid state light source driver of buck or boost operation |
-
1997
- 1997-12-23 CN CN97123449A patent/CN1187749A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100380793C (en) * | 2002-03-21 | 2008-04-09 | 电灯专利信托有限公司 | Circuit used for power factor correction |
| WO2004042903A1 (en) * | 2002-11-05 | 2004-05-21 | Dafeng Weng | A quasi-active power factor correction circuit for switching power supply |
| CN106888532A (en) * | 2012-09-28 | 2017-06-23 | 奥斯兰姆施尔凡尼亚公司 | Set up the solid state light source driver of buck or boost operation |
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