CN2513274Y - Improved passive power factor correcting circuit - Google Patents
Improved passive power factor correcting circuit Download PDFInfo
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- CN2513274Y CN2513274Y CN 01274822 CN01274822U CN2513274Y CN 2513274 Y CN2513274 Y CN 2513274Y CN 01274822 CN01274822 CN 01274822 CN 01274822 U CN01274822 U CN 01274822U CN 2513274 Y CN2513274 Y CN 2513274Y
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Abstract
The utility model relates to a passive power factor correcting circuit, which comprises a bridge type rectifier, a correcting unit positioned on the input end or output end of the bridge type rectifier, and the correcting unit uses a low frequency inductance to prolong the current ducting time, and the utility model cooperates a resistance to adjust the charging voltage or discharging voltage of a capacitance to ahead the current ducting time. The utility model is not limited by the internal power supply of the power supply device, which can make the current communicated in the more exact time, thereby effectively improving the power factor of the electric products.
Description
Technical field
The utility model relates to a kind of passive type circuit of power factor correction, particularly a kind of passive type power factor correction circuit that improves the current harmonics effect.
Background technology
Electric power is in transmission course, because of there is induction reactance in cable, so after the suitable transmission range of process, voltage forms the inductive phase difference with leading current, makes that the power factor of electric power is relatively low.For improving power factor, people adopt usually at suitable transmission range place and electric capacity are set to make the scheme of compensation.This compensation improves measure and generally is applied in special electricity consumption places such as each distribution substation or industrial area, seldom adopts at the civilian client terminal that waits.Therefore, the electric power that the general user uses is still undesirable on power factor, directly influences power consumption efficiency.
In recent years, people recognize the importance of utilization of resources gradually, begin to pay attention to the power consumption efficiency of electric product.For specific electric product, its power consumption efficiency also must meet the requirement of power factor, this power factor is to serve as the test emphasis with current harmonics (Current Harmonic), so power factor correction (PFC, Power Factor Correction) technology is developed thereupon.For instance, all now motor control circuits have all adopted the PFC technology.The PFC technology that electric product is commonly used roughly comprises following two kinds at present:
One. active power factor correction (Active PFC).
Two. passive type power factor correction (Passive PFC).
The former adopts one group of electronic circuit to finish the purpose of correcting power factors, and its advantage is that the PFC effect is very desirable, and shortcoming is cost height, complex circuit, is difficult for design, and with interference problem.For the latter, then be to establish a low frequency inductance L (as shown in Figure 8) at the power input of electric product, utilize this inductance L to prolong the current lead-through time, to improve power factor.The effect of passive type power factor correction is not as active, but it does not need complex circuit design, the low and noiseless problem of cost, thereby still be widely used.Now present passive type power factor correction technology is described in further detail.
Fig. 8, Fig. 9, Figure 10 have represented several multi-form passive type circuit of power factor correction, and it has a bridge rectifier 70, filter capacitor 71,72 etc. respectively, and install an inductance L additional respectively on the input of bridge rectifier 70 or output.In Fig. 8, inductance L is installed between bridge rectifier 70 outputs and the filter capacitor 71,72; Inductance L among Fig. 9 is located between power input AC IN and the bridge rectifier 70; Inductance L among Figure 10 then cross-over connection between the input and output of bridge rectifier 70.
In above-mentioned several form, inductance L and bridge rectifier 70 are series system, therefore have identical effect.In the oscillogram shown in Figure 11, first group of waveform be not for taking the power circuit input signal of PFC measure.Wherein, the string ripple partly is an input voltage waveform, and its input current waveform (oblique line district) amplitude is big, and ON time is short.Second group of waveform is for adopting the power circuit input signal of aforesaid passive type circuit of power factor correction among Figure 11, and its input current waveform (oblique line district) demonstration current lead-through time has been elongated, and its amplitude also descends thereupon.Compared to not adopting before the PFC technology existing significant improvement of current harmonics.
As previously described, the effect of passive PFC is not as active PFC.The 3rd group of waveform represented to adopt the input power supply signal waveform of the electric product of active PFC among Figure 11, and its input current can change in the same way with the input voltage size, and compared to the second group of waveform that adopts passive PFC, its current harmonics is obviously preferable.This mainly is because the inductance L in the passive PFC is limited to itself physical characteristic, the ON time that can't make electric current in advance due to.
Except that foregoing property difference, adopt the power circuit of passive PFC, when load is big more,, just must make inductance L induction reactance become big in order still to meet the requirement of current harmonics.Because winding strengthens, and has also increased cost naturally, improved working temperature simultaneously relatively.
The problems referred to above at passive PFC exists have occurred a solution again in this field.As shown in figure 12, set up a capacitor C 1 and two diode D1, D2 separately at the output of bridge rectifier 70, wherein capacitor C 1 is by diode D1, charged by the VCC power supply of power supply unit inside.Utilize this capacitor C 1 to make the current lead-through time in advance, can't make the problem that the current lead-through time shifts to an earlier date thereby solved common passive PFC.Also there is following shortcoming in this measure:
1. in order to shift to an earlier date the electric capacity of current lead-through time, be to utilize the inner VCC power supply of handling through rectifying and wave-filtering of power supply unit to charge, so still rely on the power supply supply of power supply unit inside on using, its use is restricted.
2. can't adjust the current lead-through time.Aforementioned electric capacity is only charged by the VCC power supply, and its charging and discharging time is all fixed, and can not set or adjust the time of charging voltage or discharge according to actual needs.
Summary of the invention
The purpose of this utility model is to provide a kind of and is not subjected to power supply unit power supply restriction, and the passive type circuit of power factor correction of adjustable current ON time.
For realizing this purpose, passive type power factor correction circuit described in the utility model comprises a bridge rectifier, two filter capacitors and a correcting unit.Filter capacitor is located at the output of bridge rectifier, and correcting unit is located between input, output or the input and output of bridge rectifier.Correcting unit utilizes a low frequency inductance to elongate the current lead-through time, utilizes an electric capacity to shift to an earlier date the current lead-through time again.This electric capacity is charged by ac power input end, utilizes resistance to adjust its charging voltage or restriction discharge voltage again, makes current circuit to shift to an earlier date conducting than correct time.
Because the utility model is to utilize the AC power end that electric capacity is charged, with the supply independent of power supply unit inside, so be not subjected to the restriction of power supply unit internal electric source.The utility model utilizes a resistance that the charge and discharge voltage of electric capacity in the correcting unit is limited, and makes that electric current can be with than the correct time conducting, thereby can effectively improve the power factor of electric product.When load is big, the utility model utilizes assemblies such as electric capacity, resistance that inductance is revised, make inductance can utilize existing structure to be applicable to more powerful electric product, not only reduced cost, also solved the problem that increases the heating that produces because of inductance coil.As a same reason,, also can dwindle volume, size, the weight of inductance in the correcting circuit, thereby help the miniaturization of product by correction to inductance.
Description of drawings
Fig. 1 is the circuit diagram of the utility model first preferred embodiment.
Fig. 2 is a working waveform figure of the present utility model.
Fig. 3 is the circuit diagram of the utility model second preferred embodiment.
Fig. 4 is the circuit diagram of the utility model the 3rd preferred embodiment.
Fig. 5 is the circuit diagram of the utility model the 4th preferred embodiment.
Fig. 6 is the circuit diagram of the utility model the 5th preferred embodiment.
Fig. 7 is the circuit diagram of the utility model the 6th preferred embodiment.
Fig. 8 is the circuit diagram of a kind of passive PFC of the prior art.
Fig. 9 is the circuit diagram of another kind of passive PFC of the prior art.
Figure 10 is the circuit diagram of another passive PFC of the prior art.
Figure 11 is the power circuit input signal work wave comparison diagram that does not adopt PFC, employing passive PFC (Passive PFC) and adopt active PFC (Active PFC).
Figure 12 is the circuit diagram of another kind of passive PFC of the prior art.
Embodiment
Now in conjunction with the accompanying drawings, embodiment of the present utility model is described in further detail.
Fig. 1 is the circuit diagram of the utility model first preferred embodiment, has disclosed general electric product AC/DC converting circuit commonly used, and it is made up of a bridge rectifier 10 and the filter capacitor C3, the C4 that are located at its output.The utility model is set up a correcting unit 20 on this basis, this correcting unit 20 divides with two inductance winding L 1, L2 on the two ends power supply that is located between bridge rectifier 10 and filter capacitor C3, C4, its power supply one end with two branch road modes by capacitor C 1, C2, resistance R 1, R2, diode D5, D6 respectively be positioned at both ends of power on the inductance winding be connected.Concrete connected mode is, wherein a branch road is by capacitor C 1, forward diode D5 connects an end of inductance winding L 1 inflow current, and 1 string of inductance winding L 1 other end and capacitor C has a resistance R 1, with limiting capacitance C1 charging voltage; Another branch road is an end that connects another inductance winding L 2 inflow currents by capacitor C 2, resistance R 2, and inductance winding L 2 other ends are connected a diode D6 forward with 2 of capacitor C.
Utilize this circuit, can produce the current circuit of three conductings successively respectively at the positive and negative half cycle of power supply, wherein the ON time of two current circuits is determined by resistance R 1, R2, and its concrete Analysis of Working Performance is as follows:
When power supply is positive half cycle (the L end of AC IN is low-voltage for high voltage, N end), this moment, L held the current path of N end to have three kinds:
1. first current circuit is to be held to N through D1, L1, C3, C4, L2, D4 by the L end.Its ON time is the t3 shown in Fig. 2.
2. second current circuit is to be held to N through C2, R2, L2, D4 by the L end.Its ON time is the t1 shown in Fig. 2.
3. the 3rd current circuit is to be held to N through C1, D5, L1, C3, C4, L2, D4 by the L end.Its ON time is t2 shown in Figure 2.
Aforementioned second current circuit has two characteristics: 1. ON time t1 is more Zao than the first current circuit t2.2. current value is limited because of R2, so the C2 charging voltage is limited in a particular value.
When the 3rd current circuit produced again, the C1 in the loop had been recharged when last negative half period, so its ON time t2 early than the first current circuit t3, but is later than the second current circuit t1.
When power supply is negative half period (the L end of AC IN is high voltage for low-voltage, N end), this moment, N held the current path of L end also to have three kinds:
1. first current circuit is to be held to L through D3, L1, C3, C4, L2, D2 by the N end.Its ON time is t6 shown in Figure 2.
2. second current circuit is to be held to L through D3, L1, R1, C1 by the N end.Its ON time is t4 shown in Figure 2.
3. the 3rd current circuit is to be held to L through D3, L1, C3, C4, L2, D6, C2 by the N end.Its ON time is t5 shown in Figure 2.
Aforementioned second current circuit has two characteristics: 1. ON time t4 is more Zao than the first current circuit t6.2. current value is limited because of R1, so the C1 charging voltage is limited in a particular value.
When the 3rd current circuit produced again, the C2 in the loop had been recharged when last positive half cycle, so its ON time t5 early than the first current circuit t6, but is later than the second current circuit t4.
Based on above-mentioned characteristic, electric current can shift to an earlier date conducting in the time of setting, and does to change in the same way with voltage, and its ON time is set or control by resistance R 1, R2.
Figure 3 shows that second preferred embodiment of the present utility model, its particular circuit configurations and first embodiment are basic identical, difference is in diode D5, the D6 and corresponding resistance R 1, R2 location swap in 20 liang of branch roads of this correcting unit, and diode D5, D6 error-polarity connection.This programme can realize and the first embodiment identical functions, and the difference on itself and the first preferred embodiment principle is: in first preferred embodiment, resistance R 1, R2 are the charging voltages in order to limiting capacitance C1, C2; In the present embodiment, because of resistance R 1, R2 and diode D5, D6 exchange, and diode D5, D6 error-polarity connection, resistance R 1, R2 then are the discharge voltages in order to limiting capacitance C1, C2.So present embodiment is identical with first embodiment, also can realize the purpose of Control current ON time.
Figure 4 shows that the 3rd preferred embodiment of the present utility model, it is located at correcting unit 20 between the input (AC IN) and output of bridge rectifier 70.This correcting unit 20 is to import an end with the power supply that an inductance L 1 is located at bridge rectifier 10, and this inductance L 1 constitutes two other current circuit in two branch road modes by capacitor C 1, C2, resistance R 1, R2, diode D5, D6 between two ends power supply L, N.
When power supply was positive half cycle, this moment, L held the current path of N end to have three kinds:
1. first current circuit is held to N through L1, D3, C4, D2 by the L end.
2. second current circuit is held to N through L1, D3, R2, C2 by the L end.
3. the 3rd current circuit is held to N through L1, C1, D5, C3, C4, D2 by the L end.
The ON time of aforementioned three current circuits is 2 → 3 → 1 in regular turn.
When power supply was negative half period, this moment, N held the current path of L end also to have three kinds:
1. first current circuit is held to L through D1, C3, C4, L1 by the N end.
2. second current circuit is held to L through D1, R1, C1, L1 by the N end, and wherein, the charging voltage of capacitor C 1 system is subjected to resistance R 1 restriction.
3. the 3rd current circuit is held to L through C2, D6, C3, C4, D4, L1 by the N end.
The ON time of aforementioned three current circuits is 2 → 3 → 1 in regular turn.
Present embodiment is identical with aforementioned two embodiment, by correcting unit 20, can shift to an earlier date and prolong the ON time of electric current.
Figure 5 shows that the 4th preferred embodiment of the present utility model, its particular circuit configurations and the 3rd embodiment are basic identical, and difference is diode D5, the D6 error-polarity connection in the correcting unit 20.This programme can be realized characteristic and the effect identical with circuit structure shown in the 3rd embodiment, and it is described that the difference of principle aspect sees also second embodiment, do not repeat them here.
Figure 6 shows that the 5th preferred embodiment of the present utility model, its particular circuit configurations is also basic identical with the 3rd embodiment, difference is to establish a two-way diode D7 between the output of two current circuits of correcting unit 20 and bridge rectifier 10, utilize the start time of bidirectional diode D7 decision capacitor C 1 or C2 discharge, and then obtain comparatively exact current loop ON time.
Figure 7 shows that the 6th preferred embodiment of the present utility model, wherein, correcting unit 20 is located between bridge rectifier 70, power input (AC IN) and the power output end.This correcting unit 20 is located at the power input of bridge rectifier 10 with an inductance L 1, and the end that this inductance L 1 flows out electric current sees through the output that a capacitor C 1, a resistance R 1 are connected to this AC/DC converting circuit again.Identical with aforementioned each embodiment, resistance R 1 is in order to the charging voltage of limiting capacitance C1, and its ON time is early than original current circuit, so the current lead-through time be done sth. in advance and be prolonged to cooperation inductance L 1 can, to promote the effect of improving of power factor.
Claims (8)
1. passive type circuit of power factor correction, comprise a bridge rectifier, two filter capacitors and a correcting unit, filter capacitor is located at the output of bridge rectifier, correcting unit is located at the input or the output of bridge rectifier, correcting unit utilizes a low frequency inductance to elongate the current lead-through time, utilizes an electric capacity to shift to an earlier date the current lead-through time again; It is characterized in that: this electric capacity is charged by ac power input end, utilizes resistance to adjust its charging voltage or restriction discharge voltage again, makes current circuit to shift to an earlier date conducting than correct time.
2. passive type circuit of power factor correction according to claim 1, it is characterized in that: correcting unit is to divide on the both ends of power that is located between bridge rectifier and filter capacitor with two inductance winding L 1, L2, and power supply one end with two branch road modes by a capacitor C 1, C2, a resistance R 1, R2 respectively be positioned at both ends of power on inductance winding L 1, L2 be connected.
3. passive type circuit of power factor correction according to claim 2, it is characterized in that: a branch road of correcting unit be by capacitor C 1, forward diode D5 connect an end of inductance winding L 1 inflow current, and the other end of inductance winding L 1 and 1 of capacitor C are serially connected with a resistance R 1; Another branch road is an end that connects another inductance winding L 2 inflow currents by capacitor C 2, resistance R 2; And inductance winding L 2 other ends are connected a diode D6 forward with 2 of capacitor C.
4. passive type circuit of power factor correction according to claim 2, it is characterized in that: a branch road of correcting unit is an end that connects inductance winding L 1 inflow current by capacitor C 1, a resistance R 1, and the other end of inductance winding L 1 and 1 of capacitor C are serially connected with a diode D5; Another branch road is an end that connects another inductance winding L 2 inflow currents by capacitor C 2, a diode D6; And the other end of inductance winding L 2 is connected a resistance R 2 with 2 of capacitor C.
5. passive type circuit of power factor correction according to claim 1 is characterized in that: correcting unit is located between bridge rectifier input and the output.
6. passive type circuit of power factor correction according to claim 5, it is characterized in that: correcting unit is a power input that is located at bridge rectifier with an inductance L 1, and these inductance L 1 one ends are to constitute two extra current circuits in two branch road modes by capacitor C 1, C2, resistance R 1, R2, diode D5, D6 between two power end L, N.
7. passive type circuit of power factor correction according to claim 5, it is characterized in that: correcting unit is to be located on the power input of bridge rectifier with an inductance L 1, and the other end of inductance L 1 is connected on the output of bridge rectifier by a capacitor C 1, a resistance R 1.
8. passive type circuit of power factor correction according to claim 6 is characterized in that: be provided with a two-way diode between two branch current loops of correcting unit and the bridge rectifier output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01274822 CN2513274Y (en) | 2001-11-22 | 2001-11-22 | Improved passive power factor correcting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01274822 CN2513274Y (en) | 2001-11-22 | 2001-11-22 | Improved passive power factor correcting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN2513274Y true CN2513274Y (en) | 2002-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01274822 Expired - Fee Related CN2513274Y (en) | 2001-11-22 | 2001-11-22 | Improved passive power factor correcting circuit |
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| CN (1) | CN2513274Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255523A (en) * | 2010-04-22 | 2011-11-23 | Ise科技有限公司 | Power supply device having current control circuit capable of correcting power factor |
| CN112258685A (en) * | 2020-10-23 | 2021-01-22 | 安徽烁迅软件有限公司 | Power equipment partial discharge inspection system |
-
2001
- 2001-11-22 CN CN 01274822 patent/CN2513274Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255523A (en) * | 2010-04-22 | 2011-11-23 | Ise科技有限公司 | Power supply device having current control circuit capable of correcting power factor |
| CN112258685A (en) * | 2020-10-23 | 2021-01-22 | 安徽烁迅软件有限公司 | Power equipment partial discharge inspection system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20020925 Termination date: 20091222 |