CN1681190A - Circuit of reverse-flow circuit with power factor correct - Google Patents
Circuit of reverse-flow circuit with power factor correct Download PDFInfo
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- CN1681190A CN1681190A CN 200510063307 CN200510063307A CN1681190A CN 1681190 A CN1681190 A CN 1681190A CN 200510063307 CN200510063307 CN 200510063307 CN 200510063307 A CN200510063307 A CN 200510063307A CN 1681190 A CN1681190 A CN 1681190A
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Abstract
The invention discloses a reverse-flow circuit with power factor correction. The AC current signal provided by power source is received and treated by electromagnetic interference filter unit and rectifying unit and outputs a full-wavehalf-wave AC current signal. The first power factor corrector receives the full-wavehalf-wave AC current signal and connects to a voltage regulating unit with the voltage regulating value for sending an electric power signal after voltage transformation. Thereby, the electric power signal is depended on the different voltage regulating value. Thus, the high voltage electric power signal for boosted output, received by the connected inverter, gets a good power factor correcting function.
Description
Technical field
The present invention relates to a kind of circuit of inverter, particularly a kind ofly be applied to produce the high-tension electricity signal to drive the circuit of inverter of load.
Background technology
In recent years, because electronics, computer product are very general, wherein more popular with the application surface of LCD screen, particularly the LCD screen technology has extended to household appliances, so the consumer improves the requirement meeting of product thereupon, and then make producer and research staff more will pay attention to the technology aspect multi-functional and power saving, on market, just can have more competitiveness like this, environmental consciousness also comes into one's own day by day in addition, and therefore the harmonic current that is produced for electronics, computer product power consumption electric current also is considered as the project that desire is improved.
Below now industry just, two kinds of prior art frameworks are proposed:
First kind of drive circuit is directly to provide ac signal to a power supply unit 28 by power supply 10, output power signal to inverter 13 carries out exporting the high-tension electricity signal after the boost action after carrying out voltage transitions by power supply unit 28 again, its circuit flow chart as shown in Figure 1, by finding out among the figure, existing power supply unit 28 is in the ac signal of handling power supply 10 outputs, include an electromagnetic interference filter unit 11, one rectification unit 12, one power factor corrector 15, one converting unit 16, receive this ac signal and involve rectification processing back output one complete/half-wave DC signal after filtration by electromagnetic interference filter unit (EMI) 11 and rectification unit 12, receive by power factor corrector 15 again that this is complete/after the half-wave DC signal carries out Active PFC the output power signal to converting unit (DC-DC) 16, by carrying out voltage transitions and export a low-voltage power signal behind the converting unit 16 reception electric power signals to inverter 13, at this moment, inverter 13 is in the load 14 of boosting and connecting to the rear end for the high-tension electricity signal; The advantage of this kind drive circuit is directly to utilize existing power supply unit 28 voltage transitions to be provided and need not to increase other circuit, but restriction because of the low-voltage power signal of existing power supply unit 28 outputs, when being boosted, inverter 13 need improve efficiency of movement, to increase the heat energy of its action like this, influence its due power output on the contrary.
Consult shown in Figure 2 again, it is another drive circuit, be with the difference of aforementioned drive circuit, this drive circuit is the ac signal that power supply 10 is exported to be received and involved after filtration by electromagnetic interference filter unit 11 and rectification unit 12 export a complete/half-wave DC signal after rectification is handled, this complete/half-wave DC signal is the medium voltage electricity signal, and (for example power supply 10 is 110V, then this is complete/and the half-wave DC signal is 150V), directly boost and export a high-tension electricity signal to load 14 in this medium voltage electricity signal to inverter 13 backs; Because this kind drive circuit is that output medium voltage electricity signal is to inverter 13, therefore can remove the power loss of converting unit (DC-DC) 16, except that the heat energy that reduces its generation, also can prolong its useful life, but, this kind drive circuit lacks Active PFC, still exist harmonic wave (Harmonic) in the electric power signal of being exported, therefore often produce harmonic distortion problems, moreover, because of voltage and electric current have the different problem of phase place,, can't meet the requirement of various countries for the test specification of household appliances so power can not be proofreaied and correct and make power factor (PF) on the low side.
In addition, above-mentioned two kinds of drive circuits also have a common shortcoming, because briliancy must be suitably adjusted in the interference of the corresponding external light of LCD screen or LCD TV, but all can only provide fixed voltage merely with above-mentioned two kinds of drive circuits, therefore, the different voltages of uncontrollable inverter 13 outputs are adjusted briliancy, but other control circuit of design connects in addition, will increase the complexity of design cost and circuit like this.
Summary of the invention
Main purpose of the present invention is to address the aforementioned drawbacks, for avoiding the existence of this defective, the invention provides a kind of possess simultaneously Active PFC and the exportable adjustable medium voltage electricity signal drive circuit to inverter is arranged, and the voltage change that the pressure regulation unit that this drive circuit more connects by first power factor corrector is provided, make the medium voltage electricity signal of output provide different power specification collocation dissimilar inverter specifications, use the purpose of the Active PFC that reaches preferable.
Another object of the present invention is to, first power factor corrector of the present invention can one second power factor corrector in parallel, electric power signal to a converting unit by the output of second power factor corrector, by carrying out voltage transitions and export a low-voltage power signal behind the converting unit reception electric power signal, provide other parts (for example drive IC) on the circuit board required electric power with this low-voltage power signal, allow the present invention have more the modularity design.
A further object of the present invention is that the output of low-voltage power signal can connect a converting unit in parallel with inverter by the first power factor corrector rear end and carry out exporting after electric power signal is handled.
Description of drawings
Fig. 1 is the calcspar of existing back light module control circuit.
Fig. 2 is the calcspar of another existing back light module control circuit.
Fig. 3 is the circuit block diagram according to the first embodiment of the present invention.
Fig. 4 is a circuit block diagram according to a second embodiment of the present invention.
Fig. 5 is the circuit block diagram of a third embodiment in accordance with the invention.
Embodiment
About preferred embodiment of the present invention and technology contents, existing accompanying drawings is as follows:
See also shown in Figure 3, it is the circuit block diagram of the first embodiment of the present invention, as shown in the figure, the present invention is a kind of inverter 25 circuit that possess Active PFC, this inverter 25 outputs one high-tension electricity signal is to load 26, this load 26 can be cold cathode fluorescent lamp (CCFL), and drive circuit of the present invention comprises:
One power supply 20, it provides an ac signal, and this power supply 20 is civil powers, and the power specification of being exported is various countries' power specification (for example 110V or 220V);
One electromagnetic interference filter unit (EMI) 21 and one is the rectification unit 22 of diode bridge rectifier, it receives this ac signal, and involves rectification after filtration and handle back output one complete/half-wave DC signal (electromagnetic interference filter unit 21 need look various countries' power specification and determine whether be provided with);
One first power factor corrector (PFC) 24, it receives and is somebody's turn to do complete/half-wave DC signal, it is the pressure regulation unit 23 of variable resistor or fixed resistance that this first power factor corrector 24 connects one, this pressure regulation unit 23 provides a voltage change, make this first power factor corrector 24 with this voltage change will be complete/after the half-wave DC signal carries out voltage transitions, send an electric power signal;
One inverter (INVERTER) 25, it receives the load 26 that output one high-tension electricity signal in back connects to the rear end of boosting of this electric power signal.
From circuit flow chart of the present invention, can obviously find out, rectification unit 22 output complete/after the half-wave DC signal carries out Active PFC through first power factor corrector 24, can effectively improve problems such as harmonic distortion and phase deviation, and voltage change by 23 settings of pressure regulation unit, the electric power signal that first power factor corrector 24 is exported obtains voltage regulation function, and (voltage change that this pressure regulation unit 23 sets is to be booster type according to first power factor corrector 24, voltage-dropping type or buck-boost type and different voltage specifications are provided), at this moment, voltage specification difference because of 24 outputs of first power factor corrector, therefore the electric power signal of inverter 25 different voltages can be provided, make inverter 25 under the electric power signal of different voltages, the high-tension electricity signals of different outputs are provided and reach the purpose of control load 26 briliancy.
See also shown in Figure 4, it is the circuit block diagram of second embodiment of the invention, as shown in the figure, the present invention obtains Active PFC effect and the Regulation Control briliancy function except that the high-tension electricity signal that improves inverter 25 outputs, (can connect equally and establish one is the pressure regulation unit 23 of variable resistor or fixed resistance also can to connect second a power factor corrector 24a in parallel with first power factor corrector 24 in 22 shuntings of this rectification unit, the voltage change that this pressure regulation unit 23 sets is to be booster type according to the second power factor corrector 24a, voltage-dropping type or buck-boost type and different voltage specifications is provided), this second power factor corrector 24a receives that this is complete/electric power signal to a converting unit (DC-DC) 27 that the half-wave DC signal is exported after treatment, by carrying out voltage transitions and export the load 26a that a low-voltage power signal connects to the rear end behind the converting unit 27 reception electric power signals, make peripheral parts (for example drive IC on the circuit board) also can obtain supply of electric power by circuit of the present invention, and do not need to dispose in addition again power supply unit, allow the present invention have more modularity design and increase economic efficiency.
See also shown in Figure 5, it is the circuit block diagram of third embodiment of the invention, as shown in the figure, identical with Fig. 4 demand purpose, present embodiment is in order to provide a low-voltage power to export load 26b to equally, present embodiment connects a converting unit (DC-DC) 27 in parallel with inverter 25 by the shunting of first power factor corrector 24, carries out voltage transitions and exports the load 26b of a low-voltage power signal to the rear end connection after receiving electric power signals by converting unit 27.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (20)
1. circuit of inverter that possesses Active PFC is characterized in that comprising:
One power supply, it provides an ac signal;
An one electromagnetic interference filter unit and a rectification unit, it receives described ac signal, and involves rectification processing back output one complete/half-wave pulse wave direct current signal after filtration;
One first power factor corrector, its receive described complete/the half-wave DC signal, described first power factor corrector also connects a pressure regulation unit, described pressure regulation unit provides a voltage change, make described first power factor corrector with this voltage change with described complete/the half-wave DC signal carries out sending an electric power signal after the voltage transitions;
One inverter, it receives the load that output one high-tension electricity signal in back connects to the rear end of boosting of described electric power signal.
2. the circuit of inverter that possesses Active PFC according to claim 1 is characterized in that described power supply is a civil power.
3. the circuit of inverter that possesses Active PFC according to claim 1 is characterized in that, described rectification unit is a diode bridge rectifier.
4. the circuit of inverter that possesses Active PFC according to claim 1 is characterized in that, described pressure regulation unit is a variable resistor.
5. the circuit of inverter that possesses Active PFC according to claim 1 is characterized in that, described pressure regulation unit can be a fixed resistance.
6. the circuit of inverter that possesses Active PFC according to claim 1 is characterized in that, described load is a cold cathode fluorescent lamp.
7. the circuit of inverter that possesses Active PFC according to claim 1, it is characterized in that, described rectification unit can be shunted and connect second power factor corrector in parallel with described first power factor corrector, electric power signal to one converting unit of described second power factor corrector output is by carrying out voltage transitions and export the load that a low-voltage power signal connects to the rear end behind the described converting unit reception electric power signal.
8. the circuit of inverter that possesses Active PFC according to claim 7 is characterized in that, described second power factor corrector also can be equipped with a pressure regulation unit for variable resistor or fixed resistance.
9. the circuit of inverter that possesses Active PFC according to claim 1, it is characterized in that, described first power factor corrector can be shunted and connect a converting unit in parallel with boosting unit, by carrying out voltage transitions and export the load that a low-voltage power signal connects to the rear end behind the described converting unit reception electric power signal.
10. circuit of inverter that possesses Active PFC is characterized in that comprising:
One power supply, it provides an ac signal;
One rectification unit, it receives described ac signal, and through over commutation handle back output one entirely/half-wave pulse wave direct current signal, and described rectification unit can be shunted be connected in parallel one first power factor corrector and one second power factor corrector, described first power factor corrector with described complete/after the half-wave DC signal carries out voltage transitions, send electric power signal to the inverter load that output one high-tension electricity signal in back connects to the rear end of boosting, and electric power signal to a converting unit of described second power factor corrector output, by carrying out voltage transitions and export the load that a low-voltage power signal connects to the rear end behind the converting unit reception electric power signal.
11. the circuit of inverter that possesses Active PFC according to claim 10 is characterized in that described power supply is a civil power.
12. the circuit of inverter that possesses Active PFC according to claim 10 is characterized in that, described rectification unit is a diode bridge rectifier.
13. the circuit of inverter that possesses Active PFC according to claim 10 is characterized in that, described rectification unit also is electrically connected with an electromagnetic interference filter unit.
14. the circuit of inverter that possesses Active PFC according to claim 10 is characterized in that, described first power factor corrector can connect a pressure regulation unit that voltage change is provided.
15. the circuit of inverter that possesses Active PFC according to claim 14 is characterized in that, described pressure regulation unit is a variable resistor.
16. the circuit of inverter that possesses Active PFC according to claim 14 is characterized in that, described pressure regulation unit can be a fixed resistance.
17. the circuit of inverter that possesses Active PFC according to claim 10 is characterized in that, described second power factor corrector can connect a pressure regulation unit that voltage change is provided.
18. the circuit of inverter that possesses Active PFC according to claim 17 is characterized in that, described pressure regulation unit is a variable resistor.
19. the circuit of inverter that possesses Active PFC according to claim 17 is characterized in that, described pressure regulation unit can be a fixed resistance.
20. the circuit of inverter that possesses Active PFC according to claim 10 is characterized in that, the described load that receives the driving of high-tension electricity signal is a cold cathode fluorescent lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510063307 CN1681190A (en) | 2004-04-09 | 2005-04-06 | Circuit of reverse-flow circuit with power factor correct |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200410033746 | 2004-04-09 | ||
| CN200410033746.9 | 2004-04-09 | ||
| CN 200510063307 CN1681190A (en) | 2004-04-09 | 2005-04-06 | Circuit of reverse-flow circuit with power factor correct |
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| Publication Number | Publication Date |
|---|---|
| CN1681190A true CN1681190A (en) | 2005-10-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510063307 Pending CN1681190A (en) | 2004-04-09 | 2005-04-06 | Circuit of reverse-flow circuit with power factor correct |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101174394B (en) * | 2006-11-01 | 2010-10-27 | 乐金显示有限公司 | Liquid crystal display device and method of controlling the same |
| CN102754525A (en) * | 2009-10-20 | 2012-10-24 | Lsi工业公司 | Solid state lighting, driver circuits, and related software |
| WO2014067131A1 (en) * | 2012-11-02 | 2014-05-08 | Broadcom Corporation | Signaling notification scheme for in-device coexistence interference |
-
2005
- 2005-04-06 CN CN 200510063307 patent/CN1681190A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101174394B (en) * | 2006-11-01 | 2010-10-27 | 乐金显示有限公司 | Liquid crystal display device and method of controlling the same |
| CN102754525A (en) * | 2009-10-20 | 2012-10-24 | Lsi工业公司 | Solid state lighting, driver circuits, and related software |
| WO2014067131A1 (en) * | 2012-11-02 | 2014-05-08 | Broadcom Corporation | Signaling notification scheme for in-device coexistence interference |
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Open date: 20051012 |