CN2834002Y - Improved passive electric power filter circuit - Google Patents
Improved passive electric power filter circuit Download PDFInfo
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- CN2834002Y CN2834002Y CN 200520008440 CN200520008440U CN2834002Y CN 2834002 Y CN2834002 Y CN 2834002Y CN 200520008440 CN200520008440 CN 200520008440 CN 200520008440 U CN200520008440 U CN 200520008440U CN 2834002 Y CN2834002 Y CN 2834002Y
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Abstract
The utility model discloses an improved passive electric power filter circuit which is used for providing rated compensation voltage for a power factor compensation circuit to solve the problem of unstable power supply output caused by the fact that branch current is used for obtaining raged voltage by existing self stand-by supply circuits. In addition, an advanced part or a lagged part of a current phase which can not be solved by a passive electric power filter circuit is compensated by means of a circuit which can in advance charge two filtering capacitors connected to and arranged on the output end of direct current electricity of a rectifier at different time points, and thus, the power factor of power supply output is improved.
Description
Technical field
The utility model relates to a kind of improved passive type power filter circuit, particularly a kind ofly can come the power circuit of the required rated voltage of setting compensation circuit working according to the demand of compensating circuit.
Background technology
Along with the progress of science and technology, people also grow with each passing day for the dependence of electric energy, and electric power has been indispensable in a modern life valuable source.Requirement to electric power was the electric power abundance in the past, but upgrading along with growth in the living standard and scientific and technological industry, the power supply and demand of pursuing high quality, it is the target that global various countries will reach always, China's industry has made the transition and has been high-tech, the Peak output industry, also representing many precision equipments to be widely used, therefore cause people that the requirement of electric power is also changed to some extent, the raising of on electric power, measuring, the quality that also begins to take into account the electric power quality whether, yet a large amount of construction power plant, it is not the unique channel of dealing with problems, must improve the energy that electric power is supplied with on the one hand, then need improve the power factor (Power factor) or the efficient of electric product on the other hand, could effectively deal with problems.The present items of equipment used of people, most its inside all are directly or indirectly with DC power supply work.Utilities Electric Co. is because of the consideration of electricity generation system and electric power transfer etc., the electric power that it provided is alternating current, therefore we need AC/DC converter, convert alternating current to required direct-current working volts, common AC/DC converter is a diode bridge rectifier, this circuit need only get final product by four diodes, because framework is simple and with low cost, extensively is used.As shown in Figure 2, it is its voltage/current waveform schematic diagram, but being input voltage and input current, the shortcoming of this circuit have phase place official post power factor to descend, and input current contains the higher harmonics composition, the serious distortion of the waveform of the input current that is caused, cause the electric power system instability, can make power failure when serious, add the characteristic of a lot of electric products because of its internal driving arranged now, make its power factor very low, add the require increasingly stringent of user to the electric power quality, make the power factor of improving power supply unit become an important topic, its technical essential then is to be emphatically on the power filter circuit of power supply unit.
The main effect of power filter circuit is to make the phase place of voltage and electric current identical and make load be similar to resistive to reach lower Harmonics of Input value, therefore a variety of practices are arranged on circuit design, mainly can be divided into two kinds of passive type power filter circuit and active electric power filter circuits, wherein the passive type power filter circuit is because required circuit is simple, so production cost is lower under the consideration of cost, industry adopts the passive type filter circuit more, constituted by passive devices such as electric capacity and inductance, in order to will fall behind or leading current phase compensates and reduces the current harmonics value simultaneously, requirement for power factor value is more not rigorous, its practice is to use the inductance that contains air gap silicon steel sheet form to be connected on the input, or cooperate electric capacity to make LC type or π type low pass filter, yet more be will be to the effective inductance of low frequency, its inductance value is essential bigger, for instance, ATX power supply unit on personal computer, if during the passive type power filter circuit, its volume is all quite big and heavy, power factor value also can only reach 70% under best situation, also inapplicable under the power factor requirement standard of strictness.
For improving the not good problem of passive type filter circuit output power factor; the settling mode of prior art is to adopt circuit compensation; mainly be to add a compensating circuit at original passive type filter circuit; as shown in Figure 1; comprise: an overload protecting circuit 11; one burst current restricting circuits 12; one first filter circuit 13; one circuit of power factor correction 14; one rectifier 15; one power factor compensation circuit 16; one second filter circuit 17; one power supply promotes circuit 18; one main transformer 19; one output rectifier 20; one power supply feedback circuit 21; one standby power circuit 22; and output filter circuit 23; 24; 25; wherein this power factor compensation circuit 16 is by two diode in series D4; D5; and one capacitor C 8 form; because this power factor compensation circuit 16 must have a voltage source that this capacitor C 8 is stored a rated voltage; so that allow filter capacitor C5; C6 charges in advance and reaches the effect of compensation; so this standby power circuit 22 is except as the required electric energy of supply this control IC 211 and stand-by power supply; shunt the voltage source of a loop from the negative electrode of the diode D6 of this standby power circuit 22 more in addition as this power factor compensation circuit 16; so that to these capacitor C 8 chargings; though so reached the purpose of power factor compensation; also improved output power factor; but, the voltage source of the control IC 211 that offers this power supply feedback circuit 21 can't adjust arbitrarily because of generally all being set with certain electric energy; if this voltage source is shunted to these power factor compensation circuit 16 uses from this standby power circuit 22; except output rated voltage be fixed value can't be adjusted; more will make this control IC 211 can't obtain enough electric energy; so easily this control IC 211 is produced and disturb; and make these power supply feedback circuit 21 work not normal, and then make the output instability of power supply.
Comprehensively above-mentioned, adopt the passive type power filter circuit, it is not high to have energy conversion efficiency on using, be easy to generate problems such as power frequency vibrations and noise, if and the compensating circuit that installs the prior art disclosure additional easily causes the instability of out-put supply, though so the passive type electric-power filter extensively is used in the electric power system, its circuit structure still remains to be improved.
The utility model content
Defective in view of above-mentioned prior art, main purpose of the present utility model is not obtain voltage source from this standby power circuit shunting, but otherwise designed one can be different along with the voltage requirements of power factor compensation circuit and the voltage source circuit set, existingly do shunting from the standby power circuit and obtain the power supply output problem of unstable that rated voltage is caused to solve.
Another purpose of the present utility model is to provide a multistage power factor compensation circuit, improving the power factor of power supply unit, and meets electrical code, and saves cost of manufacture.
Therefore, according to improved passive type power filter circuit of the present utility model, input power factor and reduction supply harmonic value in order to improve power supply equipment improve electric power system efficient, and it comprises: a rectifier; Two filter capacitors are electrically connected on the DC output end of rectifier in the mode of connecting; One power factor compensation circuit is electrically connected between the DC output end and two filter capacitors of rectifier, enters the current lead-through time of two filter capacitor store electrical energy with the DC output end that shifts to an earlier date rectifier; And a power factor compensation voltage source circuit, having a coil windings independently, its electrical couplings is in the main transformer of power supply equipment, in order to produce the required specified bucking voltage of power factor compensation circuit work.
Can be according to improved passive type power filter circuit otherwise designed one of the present utility model along with the different voltage source circuits of setting of the voltage requirements of power factor compensation circuit, existingly do shunting from the standby power circuit and obtain the power supply that rated voltage causes and export problem of unstable thereby solved.
Description of drawings
Fig. 1 is the structural representation of existing power factor correction compensation circuit.
Fig. 2 is the voltage/current waveform schematic diagram of passive type filter circuit.
Fig. 3 is the structural representation of first embodiment of the present utility model.
Fig. 4 is the structural representation of second embodiment of the present utility model.
Fig. 5 is the voltage/current waveform schematic diagram after the utility model power factor correction.
Embodiment
See also shown in Figure 3; structural representation for first embodiment of the present utility model; mainly comprise overload protecting circuit 11; this burst current restricting circuits 12; first filter circuit 13; circuit of power factor correction 14; rectifier 15; power factor compensation circuit 16; second filter circuit 17; power supply promotes circuit 18; main transformer 19; output rectifier 20; power supply feedback circuit 21; standby power circuit 22; one power factor compensation voltage source circuit 27; and output filter circuit 23; 24; 25; this circuit of power factor correction 14 is a coil windings among the figure; be responsible for two filter capacitor C5 that should second filter circuit 17; C6 produces resonance effect to form current phase in advance; this power factor compensation circuit 16 is electrically connected at the DC output end and the two filter capacitor C5 of rectifier 15 among the figure; between the C6; enter two filter capacitor C5 with the DC output end of this rectifier 15 in advance; the current lead-through time of C6 store electrical energy; this power factor compensation circuit 16 comprises and filter capacitor C5; the electrical diode in series D4 of C6; D5 and one is electrically connected at this diode D4; capacitor C 8 between the D5; this power factor compensation voltage source circuit 27 is by the coil windings N2 of an electrical couplings in the primary side of this main transformer 19; reach the diode D3 that electrically is connected in series with this coil windings N2; D5; and the capacitor C 7 of this coil windings N2 that is connected in parallel is formed; in order to provide these power factor compensation circuit 16 work a required specified bucking voltage; the coil turn of this coil windings N2 wherein; can adjust according to the demand of 16 pairs of rated voltages of this power factor compensation circuit; so that allow the output voltage of this power factor compensation voltage source circuit 27 can meet the required of this power factor compensation circuit 16; simultaneously because this power factor compensation voltage source circuit 27 is independent loops; rather than this standby power circuit 22 is obtained do shunting certainly; so control IC 211 electric energy that do not have prior art to cause because of shunting are not enough to be produced and disturb, and cause this power supply feedback circuit 21 out of control and make power supply output problem of unstable.
See also Fig. 4; structural representation for second embodiment of the present utility model; mainly comprise: overload protecting circuit 11; burst current restricting circuits 12; first filter circuit 13; circuit of power factor correction 14; rectifier 15; one multistage power factor compensation circuit 26; second filter circuit 17; power supply promotes circuit 18; main transformer 19; output rectifier 20; power supply feedback circuit 21; standby power circuit 22; power factor compensation voltage source circuit 27; and output filter circuit 23; 24; 25; the required specified bucking voltage of these multistage power factor compensation circuit 26 work is provided by this power factor compensation voltage source circuit 27 among the figure; this multistage power factor compensation circuit 26 then is electrically connected at one and possesses this rectifier 15 that alternating current input and DC output end are arranged; formed by the sub-compensation circuit that array is parallel with one another; in order to allow this filter capacitor C5; C6 charged in advance in the different periods, and this sub-compensation circuit is by the diode D4 that electrically connects; D6; D7; D8; capacitor C 8; C9; C10; C11; and Zener diode Z01; Z02; Z03 forms.
See also Fig. 4, at first the power supply VCC that is provided by power factor compensation voltage source circuit 27 in last half-wave order through diode D5 to capacitor C 8, C9, C10, C11 charges, wherein capacitor C 8 is charged to the current potential in full of VCC, and capacitor C 9 has Zener diode Z01 because of string so only be filled with 3/4 current potential of VCC, capacitor C 10 strings have former 2/4 current potential that is filled with VCC of Zener diode Z02, and (wherein the power factor compensation voltage source circuit 27 for 1/4 current potential that is filled with VCC and capacitor C 11 strings have Zener diode Z03 to die, capacitor C 8, C9, C10, C11 and Zener diode Z01, Z02, how many visual offsets of Z03 is adjusted); See also shown in Figure 5, it is voltage waveform A of the present utility model, rise to and add that capacitor C 8 before had been recharged stored current potential, when being higher than filter capacitor C5, C6, the former electric energy that is stored in capacitor C 8 promptly charges as the prolongation ON time current waveform 33 (being filled with whole VCC voltage so can be activated at first because of capacitor C 8) of Fig. 5 to filter capacitor C5, C6 in advance through diode D4; When rising to again, voltage waveform A adds that capacitor C 9 before had been recharged the current potential of stored 3/4VCC, and when being higher than filter capacitor C5, C6, the former electric energy that is stored in capacitor C 9 promptly charges as the ON time current waveform 32 in advance of Fig. 5 to filter capacitor C5, C6 in advance through diode D6; As above two steps, allow capacitor C 10 couples of filter capacitor C5, C6 charge in advance when voltage waveform A rises again, when voltage waveform A rises to filter capacitor C5, C6 terminal voltage, can form a main circuit current 30 at last and begin to charge through these circuit of power factor correction 14 rectifiers 15 couples of filter capacitor C5, C6 as the prolongation ON time current waveform 31 (if being necessary to increase progression again) of Fig. 5.Therefore, the technology disclosed according to the utility model can reach order and compensate the effect of passive type power filter circuit, and meet the demand of electrical code, and cost of manufacture is low.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (7)
1. improved passive type power filter circuit in order to the input power factor that improves power supply equipment and reduce the supply harmonic value, improves electric power system efficient, it is characterized in that comprising:
One rectifier (15);
Two filter capacitors (C5, C6) are electrically connected on the DC output end of described rectifier (15) in the mode of connecting;
One power factor compensation circuit (16), be electrically connected between the DC output end and described two filter capacitors (C5, C6) of described rectifier (15), enter the current lead-through time of described two filter capacitors (C5, C6) store electrical energy with the DC output end that shifts to an earlier date described rectifier (15); And
One power factor compensation voltage source circuit (27), has a coil windings (N2) independently, its electrical couplings is in the main transformer (19) of described power supply equipment, in order to produce the required specified bucking voltage of described power factor compensation circuit (16) work.
2. improved passive type power filter circuit according to claim 1 is characterized in that, described coil windings (N2) electrical couplings is in the primary side of described main transformer (19).
3. improved passive type power filter circuit according to claim 1, it is characterized in that, described power factor compensation circuit (16) comprises and filter capacitor (C5, C6) electrical diode in series (D4, D5) and one be electrically connected at described diode (D4, D5) electric capacity between (C8), described power factor compensation power circuit (27) is by the described coil windings (N2) of electrical couplings in described main transformer (19) primary side, the diode (D3) that electrically is connected in series with described coil windings (N2), form with the electric capacity (C7) that described coil windings (N2) electrically is connected in parallel.
4. improved passive type power filter circuit according to claim 1 is characterized in that, described power factor compensation circuit (16) is a multistage power factor compensation circuit (26).
5. improved passive type power filter circuit according to claim 4, it is characterized in that, described multistage power factor compensation circuit (26) is located between the DC output end and described two filter capacitors (C5, C6) of described rectifier (15), obtain the required described specified bucking voltage of described multistage power factor compensation circuit (26) work by described power factor compensation voltage source circuit (27), shift to an earlier date the current lead-through time that described DC output end enters two filter capacitors (C5, C6) store electrical energy in order to multi-period.
6. improved passive type power filter circuit according to claim 4 is characterized in that described multistage power factor compensation circuit (26) has a sub-compensation circuit at least.
7. improved passive type power filter circuit according to claim 6, it is characterized in that, described sub-compensation circuit comprises: a diode (D6, D7, D8), one electric capacity (C9, C10, C11), one Zener diode (Z01, Z02, Z03), wherein, a described diode (D6, D7, D8) with described two filter capacitor (C5, C6) electrically series connection, a described electric capacity (C9, C10, C11) with a described diode (D6, D7, D8) electrically be connected in series a described Zener diode (Z01, Z02, Z03) with a described electric capacity (C9, C10, C11) electrically be connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520008440 CN2834002Y (en) | 2005-03-22 | 2005-03-22 | Improved passive electric power filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520008440 CN2834002Y (en) | 2005-03-22 | 2005-03-22 | Improved passive electric power filter circuit |
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| Publication Number | Publication Date |
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| CN2834002Y true CN2834002Y (en) | 2006-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520008440 Expired - Fee Related CN2834002Y (en) | 2005-03-22 | 2005-03-22 | Improved passive electric power filter circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485810A (en) * | 2014-12-08 | 2015-04-01 | 厦门银江智慧城市技术有限公司 | Power supply filtering circuit |
| CN104620493A (en) * | 2012-07-06 | 2015-05-13 | 科姆赛斯公司 | Improved switch protection i auxiliary resonant circuit |
-
2005
- 2005-03-22 CN CN 200520008440 patent/CN2834002Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104620493A (en) * | 2012-07-06 | 2015-05-13 | 科姆赛斯公司 | Improved switch protection i auxiliary resonant circuit |
| CN104620493B (en) * | 2012-07-06 | 2019-11-15 | 科姆赛斯公司 | Improved switch protecting electric current auxiliary resonance circuit |
| CN104485810A (en) * | 2014-12-08 | 2015-04-01 | 厦门银江智慧城市技术有限公司 | Power supply filtering circuit |
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| 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 |