CN100428322C - Inverter circuit for suppressing electric power conducted interference - Google Patents
Inverter circuit for suppressing electric power conducted interference Download PDFInfo
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- CN100428322C CN100428322C CNB2004100806476A CN200410080647A CN100428322C CN 100428322 C CN100428322 C CN 100428322C CN B2004100806476 A CNB2004100806476 A CN B2004100806476A CN 200410080647 A CN200410080647 A CN 200410080647A CN 100428322 C CN100428322 C CN 100428322C
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- 230000009466 transformation Effects 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 230000005764 inhibitory process Effects 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 8
- 230000001131 transforming effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 10
- 230000005611 electricity Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Abstract
The present invention discloses an inverter circuit for suppressing electric power conducted interference. The inverter circuit receives an electric power signal output by an electric power input loop, a working frequency is output by a control unit, a driving unit is used for receiving the working frequency to cut the electric power signal and output a driving signal, and a voltage transforming unit is used for receiving the driving signal to be transformed through electric power to drive a first load to act. A separating unit is configured between the driving unit and the control unit. The earthed state of the driving unit and the control unit is divided into the unearthed state through the separating unit, and the primary side and the secondary side of the voltage transforming unit, and the control unit outputs the stable working frequency to achieve the effect on suppressing the electric power conducted interference.
Description
Technical field
The present invention relates to a kind of circuit of inverter that suppresses the electric power Conduction Interference, particularly a kind of circuit of inverter that is applied to have concurrently simultaneously large and small electric current of conversion and high and low voltage electricity.
Background technology
See also shown in Figure 1, it is the block schematic diagram of the power supply circuit of video products such as traditional LCDs or LCD TV, when video product is connected to the alternating current input block of civil power, by alternating current input block input AC electric power signal, this alternating electromotive force signal carries out power conversions and is output as pulse wave direct current power signal through the rectification unit that diode group becomes, carrying out power factor correction function through a power factor adjustment unit again is the direct current of voltage regulation force signal, this direct current of voltage regulation force signal parallel connection exports an inverter (inverter) to, and through the second driving loop to, second voltage transformation unit, this second voltage transformation unit is exported the low-voltage power signal to drive second load in order to step-down, inverter is then exported the high-tension electricity signal to drive first load in order to boost, alleged herein second load comprises the video signal treatment circuit, the device of palpus such as loudspeaker low-voltage driving, first load is then for providing the cold cathode fluorescent lamp of brightness of display screen.
From the circuit block diagram of traditional video product as can be seen, because power source all belongs to same rectification unit, same driving loop, therefore, first load and second load are the common ground state, because second load drives with low-voltage power, and in the driving process, must keep the stable DC electric power signal, if electric power signal is interfered and produces fluctuation, will influence the effect of second load action, for example display screen will produce ripple, color reaction inequality and loudspeaker output tonequality are impure, phenomenons such as noise, another electric power interference phenomenon then is circuit of inverter, owing to comprise the control module of an output services frequency in the circuit of inverter, one driver element and that receives this frequency of operation cutting electric power signal and export a drive signal receives this drive signal and carries out power conversions output high-tension electricity signal to drive first voltage transformation unit of first load, as shown in Figure 2, because driver element is when carrying out frequency of operation cutting electric power signal, employing discharges and recharges kenel and causes the electric power signal fluctuation, this fluctuation signal can influence control module equally, causes frequency of operation unstable and make the load of winning produce flicker.
Produce the reason of disturbing and be that mainly the boost action mode of inverter adopts the mode of concussion fluctuation, the fluctuation electric energy will influence second load and control module by being total to earth terminal, allow second load and control module be subjected to the electric power Conduction Interference of inverter and produce above-mentioned defective, this phenomenon especially is easy to generate on large-sized video product, and video product normal images and message performance are gone up influence greatly.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the defective that exists in the above-mentioned prior art, and a kind of circuit of inverter that suppresses the electric power Conduction Interference is provided.
Circuit of inverter according to inhibition electric power Conduction Interference of the present invention, export electric power signal to a circuit of inverter by an electric power input circuit, described circuit of inverter is exported a frequency of operation by a control module, and receive described frequency of operation cutting electric power signal and export a drive signal with a driver element, and receive described drive signal with one first voltage transformation unit and carry out power conversions to drive first load action, wherein:
Dispose an isolated location between described driver element and the control module, the kenel that primary side and secondary side by the described isolated location and first voltage transformation unit is separated out driver element and control module be non-altogether, thereby reach the effect that suppresses the electric power Conduction Interference.
The invention provides a kind of separation earthing mode, remove the existing primary side of utilization first voltage transformation unit and the non-kenel of ground connection altogether of secondary side, also between the driver element of inverter and control module, dispose an isolated location that has primary side and secondary side equally, use and separate driver element fully with the frequency of operation cutting fluctuation electric energy disturbing effect that electric power signal was caused, thereby the frequency of operation that can reach control module is stable, and can avoid the flicker of first load, second load is had suppress the effect that electric power disturbs, thereby can keep normal video signal performance.
Description of drawings
Fig. 1 is the block schematic diagram of the power supply circuit of traditional video product;
Fig. 2 is the sequential chart of driver element with frequency of operation cutting electric power signal;
Fig. 3 is the synoptic diagram of first embodiment of circuit of inverter of the present invention;
Fig. 4 is the synoptic diagram of first embodiment of overall circuit of the present invention;
Fig. 5 is the synoptic diagram of second embodiment of overall circuit of the present invention; And
Fig. 6 is the synoptic diagram of second embodiment of circuit of inverter of the present invention.
Embodiment
Relevant detailed description of the present invention and technology contents, existing accompanying drawings is as follows:
See also Fig. 3, shown in 4, the present invention is by an electric power input circuit 10 outputs one electric power signal to a circuit of inverter 20, this electric power input circuit 10 is alternating current input blocks 11, reaching a conversion alternating current is galvanic rectification unit 12, and this circuit of inverter 20 is by a control module 21 outputs one frequency of operation, and receive this frequency of operation cutting electric power signal and export a drive signal with a driver element 22a, and carry out power conversions with one first voltage transformation unit, 23 these drive signals of reception and move to drive first load 25, this first load 25 and feedback voltage and current signal are to control module 21, wherein, dispose an isolated location 24a between this driver element 22a and the control module 21, primary side and secondary side by this isolated location 24a and first voltage transformation unit 23 are separated out driver element 22a and control module 21, make its ground connection kenel be non-altogether, first voltage transformation unit 23 of the present invention can be Wound-rotor type transformer or piezoelectric transformer, if piezoelectric transformer, then dispose an inductance 231 between this first voltage transformation unit 23 and the driver element 22a, for ease of understanding technical scheme of the present invention, below be that piezoelectric transformer is that example describes with circuit of inverter 20.
Fig. 4 shows the synoptic diagram of first embodiment of overall circuit of the present invention, this electric power input circuit 10 is connected in series, and another drives loop 14, dispose a power factor adjustment unit 13 between this driving loop 14 and circuit of inverter 20 and the rectification unit 12, carry out capability correction via this power factor adjustment unit 13, the electric power signal of this moment output is a voltage stabilizing direct current signal (12DCV～48DCV), and this driving loop 14 output drive signals to, second voltage transformation unit 15 is carried out power conversions to drive second load 16, this second voltage transformation unit 15 is gone back the output power signal to drive this control module 21, with regard to existing framework, be to dispose circuit of inverter 20 respectively and drive loop 14 with two circuit boards, please arranging in pairs or groups, it is shown in Figure 3 to consult, because the present invention is to have the photo-coupler of primary side and secondary side, electric capacity, or the isolated location 24a of transformer separates driver element 22a and control module 21, and cooperate the primary side and the secondary side of existing first voltage transformation unit 23, the ground connection kenel that will make driver element 22a so fully with the control module 21 and first load 25 be non-altogether, and second voltage transformation unit 15 has primary side and secondary side equally, also make second load 16 and driver element 22a be non-altogether, reaching driver element 22a by this is suppressed because of the fluctuation electric energy of frequency of operation cutting electric power signal, can not conduct to the control module 21 and second load 16 by earth terminal, make the frequency of operation of control module 21 outputs more stable, thereby the brightness effect that first load 25 of keeping cold cathode fluorescent lamp produces, and second load 16 of video signal treatment circuit and loudspeaker because of with control module 21, the ground connection kenel of first load 25 can be kept the output quality of stablizing video product for unregulated power altogether disturbs.
Fig. 5 shows the synoptic diagram of second embodiment of overall circuit of the present invention, present embodiment and difference part embodiment illustrated in fig. 4 are that this circuit of inverter 20 directly receives the electric power signals of rectification units 12 outputs, this electric power signal is a pulse direct current signal, the pulse direct current signal is directly imported driver element 22a and to first voltage transformation unit 23, owing to be input as medium voltage electricity signal (150DCV～300DCV), thereby the power attenuation that can more avoid low-voltage power to change, the electric power effects of jamming is then same as above as for suppressing.
See also shown in Figure 6, it is the synoptic diagram of second embodiment of circuit of inverter 20 of the present invention, as shown in the figure, circuit of inverter 20 of the present invention is exported same frequency to a plurality of driver element 22a, 22b simultaneously by a control module 21, then be equipped with an isolated location 24a, 24b between control module 21 and each driver element 22a, the 22b this moment, and it can reach above-mentioned inhibition electric power effects of jamming equally.
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 protection scope of the present invention.
Claims (9)
1. circuit of inverter that suppresses the electric power Conduction Interference, by an electric power input circuit (10) output one electric power signal to a circuit of inverter (20), described circuit of inverter (20) is by a control module (21) output one frequency of operation, and receive described frequency of operation cutting electric power signal and export a drive signal with a driver element (22a), and carry out power conversions with the described drive signal of first voltage transformation unit (23) reception and move to drive first load (25), it is characterized in that:
Dispose an isolated location (24a) between described driver element (22a) and the control module (21), the ground connection kenel that primary side by described isolated location (24a) and first voltage transformation unit (23) and secondary side are separated described driver element (22a) and control module (21) be non-altogether, thereby suppress the electric power Conduction Interference
Wherein, described electric power input circuit (10) is connected in series, and another drives loop (14), dispose a power factor adjustment unit (13) between described driving loop (14) and the described electric power input circuit (10), and described driving loop (14) output drive signal to one second voltage transformation unit (15) is carried out power conversions to drive second load (16), and described second voltage transformation unit (15) is gone back the output power signal to drive described control module (21).
2. the circuit of inverter of inhibition electric power Conduction Interference according to claim 1, it is characterized in that, described first load (25) feedback voltage and current signal be to control module (21), and the ground connection kenel of described first load (25) and control module (21) is for altogether.
3. the circuit of inverter of inhibition electric power Conduction Interference according to claim 1 is characterized in that, described electric power signal is voltage stabilizing direct current signal or pulse direct current signal.
4. the circuit of inverter of inhibition electric power Conduction Interference according to claim 1 is characterized in that, described electric power input circuit (10) comprises that an alternating current input block (11) and is converted to galvanic rectification unit (12) with alternating current.
5. the circuit of inverter of inhibition electric power Conduction Interference according to claim 4 is characterized in that, disposes described power factor adjustment unit (13) between described rectification unit (12) and the driver element (22a).
6. the circuit of inverter of inhibition electric power Conduction Interference according to claim 1 is characterized in that, the ground connection kenel of described second load (16) and control module (21), first load (25) is for altogether.
7. the circuit of inverter of inhibition electric power Conduction Interference according to claim 1 is characterized in that, described second load (16) is video signal treatment circuit and loudspeaker.
8. the circuit of inverter of inhibition electric power Conduction Interference according to claim 1 is characterized in that, described isolated location (24a) is for having photo-coupler, electric capacity or the transformer of primary side and secondary side.
9. the circuit of inverter of inhibition electric power Conduction Interference according to claim 1 is characterized in that, described first load (25) is a cold cathode fluorescent lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100806476A CN100428322C (en) | 2004-09-29 | 2004-09-29 | Inverter circuit for suppressing electric power conducted interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100806476A CN100428322C (en) | 2004-09-29 | 2004-09-29 | Inverter circuit for suppressing electric power conducted interference |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1755784A CN1755784A (en) | 2006-04-05 |
| CN100428322C true CN100428322C (en) | 2008-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100806476A Expired - Fee Related CN100428322C (en) | 2004-09-29 | 2004-09-29 | Inverter circuit for suppressing electric power conducted interference |
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| Country | Link |
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| CN (1) | CN100428322C (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989006894A1 (en) * | 1988-01-19 | 1989-07-27 | Etta Industries, Inc. | Fluorescent dimming ballast utilizing a resonant sine wave power converter |
| US20020003525A1 (en) * | 2000-07-06 | 2002-01-10 | Hwang Beom Young | Driving circuit for LCD backlight |
| CN1522382A (en) * | 2001-07-03 | 2004-08-18 | ���ǵ�����ʽ���� | Apparatus for supplying power and liquid crsytal display having the same |
-
2004
- 2004-09-29 CN CNB2004100806476A patent/CN100428322C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989006894A1 (en) * | 1988-01-19 | 1989-07-27 | Etta Industries, Inc. | Fluorescent dimming ballast utilizing a resonant sine wave power converter |
| US20020003525A1 (en) * | 2000-07-06 | 2002-01-10 | Hwang Beom Young | Driving circuit for LCD backlight |
| CN1522382A (en) * | 2001-07-03 | 2004-08-18 | ���ǵ�����ʽ���� | Apparatus for supplying power and liquid crsytal display having the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1755784A (en) | 2006-04-05 |
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Granted publication date: 20081022 Termination date: 20120929 |