CN2676485Y - LC quasi-serial resonant-type passive power factor correction power supply - Google Patents

Abstract

The utility model relates to an LC quasi-serial resonant-type passive power factor correction power supply, which is composed of an LC quasi-serial resonant circuit and a rectifying filter circuit. The LC quasi-serial resonant circuit is arranged between alternating current access points of an alternating current power supply and the rectifying filter circuit. According to different connecting modes of circuits, the utility model can form three kinds of power supplies which are a single-phase reducing volts type passive power factor correction power supply, a single-phase boosting volts type passive power factor correction power supply and a three-phase full-wave rectifying power supply for three-phase power factor correction. The utility model has following advantages of simple circuit, high reliability, high power factor, high efficiency, good current waveform and large output power. The utility model is primarily used in an industrial frequency low-voltage electric net to improve the power factor of commutating charges and decrease harmonic pollution.

Description

The accurate serial-resonant PPFC (Passive Power Factor Correction) of LC power supply

Affiliated technical field

The utility model relates to a kind of PPFC (Passive Power Factor Correction) power supply.

Background technology

At present, the power factor correction of countries in the world in switch power technology has two big classes: the first kind is: Active Power Factor Correction (is called for short: active correction); Second class is: PPFC (Passive Power Factor Correction) (is called for short: passive correction).So-called passive correction is meant in the correcting circuit no triode and semiconductor controlled member.

The active correction circuit, theoretical advanced, multiple functional, the circuit complexity; But integrated, just bring for use.Therefore, active correction extensive use in the high frequency switch power field.

Passive correcting circuit there is no big breakthrough technically.The shortcoming of prior art is: or the current waveform distortion is big, or the output voltage ripple is too big, and power output is little.Be applied in the electronic ballast for fluoresent lamp at present more.

The high frequency Active Power Factor Correction, though be widely used in fields such as aviation, telecommunication, computer, but it with big electrical network 220V as input during power supply, and with its long-play in the outdoor environment of the transient overvoltage that sealing, high temperature (90 ℃) and electrical network often have, facts have proved for many years: its reliability is lower, the utility model is soundd out the road of " passive correction " for the deficiency of filling up original technology, work out the passive calibration power supply of the accurate serial-resonant of LC that is suitable for the adverse circumstances operation.Can be used as the power factor correction (AC/DC conversion) of high-intensity gas discharge lamp (sodium vapor lamp, Metal halogen lamp) electric ballast, also can be used as the power factor correction of universal more powerful high frequency switch power prime, or the DC power supply on the industrial equipment, also can be applicable to higher supply frequency (as: 400HZ/S).When being used for power frequency supply, volume more greatly, output voltage is unadjustable.But if use amorphous alloy iron core, can reduced volume.

The utility model content

The purpose of this utility model is to fill up the deficiencies in the prior art, provide a kind of simple, reliable, power factor is high, the PPFC (Passive Power Factor Correction) power supply that efficient is high (AC/DC conversion).

The utility model is made up of accurate series resonant circuit of LC and current rectifying and wave filtering circuit.The accurate series resonant circuit of LC is positioned between the interchange access point of AC power and current rectifying and wave filtering circuit, at the both positive and negative polarity output direct current of filter circuit.The connected mode different according to circuit can constitute three kinds of power supplys: single-phase buck PPFC (Passive Power Factor Correction) power supply; The three phase full wave rectification power supply of single-phase step-up formula PPFC (Passive Power Factor Correction) power supply and three-phase PPFC (Passive Power Factor Correction).

The utlity model has following advantage: circuit is simple, reliability is high, power factor is high, efficient is high, current waveform is good, power output is big.

Description of drawings

Fig. 1 is an electrical schematic diagram of the present utility model;

Fig. 2 is a single-phase buck PPFC (Passive Power Factor Correction) power circuit diagram of the present utility model;

Fig. 3 is the AC supply voltage and the current waveform figure of single-phase buck PPFC (Passive Power Factor Correction) power supply of the present utility model;

Fig. 4 is a single-phase step-up formula PPFC (Passive Power Factor Correction) power circuit diagram of the present utility model;

Fig. 5 is the three phase full wave rectification power circuit schematic diagram of three-phase PPFC (Passive Power Factor Correction) of the present utility model.

Embodiment

As shown in Figure 1, utility model is made up of accurate series resonant circuit of LC and current rectifying and wave filtering circuit.The accurate series resonant circuit of LC is positioned between the interchange access point of AC power and current rectifying and wave filtering circuit, at the both positive and negative polarity output direct current of filter circuit.The connected mode different according to circuit can constitute three kinds of power supplys: single-phase buck PPFC (Passive Power Factor Correction) power supply; The three phase full wave rectification power supply of single-phase step-up formula PPFC (Passive Power Factor Correction) power supply and three-phase PPFC (Passive Power Factor Correction).

Operation principle of the present utility model: utilize the series resonance characteristic of inductance L and capacitor C, make the interchange input current be similar to sine wave; Utilize the LC series resonant tank to have low impedance characteristic, the loss of voltage of ac input end is significantly reduced, thereby improve the efficient of power supply; Utilize the equivalent resistance of load R, reduce the quality factor q of resonant tank, the voltage on the LC components and parts is reduced.

Circuit of the present utility model constitutes:

(1) single-phase buck PPFC (Passive Power Factor Correction) power circuit (as shown in Figure 2), the voltage and current waveform (as shown in Figure 3) of AC power.

Form by the accurate series resonant circuit of LC and full-wave rectification and filter circuit.Comprise one of inductance L; One of capacitor C; Respectively one of common rectifier diode D1, D2, D3, D4; One of filter capacitor C2.

(a) circuit connection: full-wave rectification D1, D2, D3, D4 have 4 terminals (1,2,3,4), one termination, first terminals 1 of capacitor C, the terminals 5 of another termination AC power, a termination second terminals 2 of inductance L, the terminals 6 of another termination AC power, the positive pole of capacitor C 2 connects the 3rd terminals 3, negative pole connects the 4th terminals 4, and load R cross-over connection is between the 3rd terminals 3 and the 4th terminals 4, and AC power is by input between terminals 5 and the terminals 6.Inductance L and capacitor C also can directly be connected, another termination second terminals 2 of C, and another termination power the 6th terminals 6 of L, first terminals 1 are connected with the 5th terminals 5 then.

As shown in Figure 2: C2＞＞C; The VD U of C2≤Em (Em is the amplitude of AC supply voltage).No-load current is zero.

(b) determining of resonant tank LC value:

Angular frequency:

$\mathrm{\ω}=2\mathrm{\πf}=\frac{1}{\sqrt{\mathrm{LC}}}$

That is:

$\mathrm{LC}=\frac{1}{{\left(2\mathrm{\πf}\right)}^2}$

F: supply frequency.

Characteristic impedance:

$Z_o=\sqrt{L/C}$

Quality factor:

$Q=\frac{Z_o}{r}$

R: the equivalent resistance of resonant tank; R is big more, and Q is more little.The Q value is unsuitable big.By formula as can be known: the product of L, C value be constant (because of f fixed).Fixed parameter is: supply frequency, AC supply voltage, peak power output (and electric current).By formula select L, select C again.Big power output is selected little L value, calculates the C value by the L value again.Practical C value is got and is calculated getting final product more than 60% of C value.

For example: AC power 50HZ/s, voltage 220V; If power output is between 100W to 1000W, then L selects in 800 milihenry to 80 milihenry scopes.

(2) single-phase step-up formula PPFC (Passive Power Factor Correction) power supply (as shown in Figure 4): form by accurate series resonant circuit of LC and voltage doubling rectifing circuit.Comprise one of inductance L, one of capacitor C, each one of common rectifier diode D5, D6, each one of multiplication of voltage filter capacitor C3 and C4.

Circuit connection: its voltage doubling rectifing circuit is made up of D5, D6 and C3, C4, have 4 terminals (10,11,12,5), inductance L is connected with capacitor C by the 13 terminals 13, another termination AC power the 6th terminals 6 of inductance L, another termination the 11 terminals 11 of capacitor C, load R cross-over connection are between the tenth terminals 10 and the 12 terminals 12, and AC power is by input between the 5th terminals 5 and the 6th terminals 6.

Circuit and explanation: capacitance C3=C4＞＞C.VD≤2Em, no-load current are zero.

(3) three phase full wave rectification of three-phase PPFC (Passive Power Factor Correction) (as shown in Figure 5):

According to the passive correcting circuit principle of single-phase buck, form passive correction three-phase full wave rectifier circuit.Requirement C5＞＞C, the L value is that single phase passive is proofreaied and correct half of L value; The C value will strengthen.

Circuit connection: by common rectifier diode (D7, D8, D9, D10, D11, D12) and filter capacitor C5 form three-phase full wave rectifier circuit, its interchange input point is the 16 terminals 16, the 17 terminals 17 and the 18 terminals 18, its direct current output is between the 14 terminals 14 and the 15 terminals 15, load R cross-over connection is in the 14 terminals 14 and the 15 terminals 15, A, B, the C three-phase, every have mutually: LaCa, LbCb, the accurate series resonant circuit of LcCc, and La=Lb=Lc, Ca=Cb=Cc, after each phase LC series connection, La, Lb, the A that the other end of Lc the connects AC power respectively line end 7 that joins, B line end 8 and the C line end 9 that joins that joins, Ca, Cb, the other end of Cc connects the 16 terminals 16 respectively, the 17 terminals 17, with the 18 terminals 18, three-phase ac power supply is respectively by terminals 7, terminals 8 and terminals 9 inputs.

If direct current output will be carried out voltage-regulation, only need add the single-phase voltage regulating circuit at output.

Claims (8)

1, the accurate serial-resonant PPFC (Passive Power Factor Correction) of a kind of LC power supply, comprise accurate series resonant circuit of LC and current rectifying and wave filtering circuit, it is characterized in that the accurate series resonant circuit of LC is placed between the interchange access point of AC power and current rectifying and wave filtering circuit, at the both positive and negative polarity output direct current of filter circuit.

2, the accurate serial-resonant PPFC (Passive Power Factor Correction) of a kind of LC according to claim 1 power supply, it is characterized in that comprising single-phase buck PPFC (Passive Power Factor Correction) power supply, the three phase full wave rectification power supply of single-phase step-up formula PPFC (Passive Power Factor Correction) power supply and three-phase PPFC (Passive Power Factor Correction).

3, the accurate serial-resonant PPFC (Passive Power Factor Correction) of a kind of LC according to claim 2 power supply is characterized in that single-phase buck PPFC (Passive Power Factor Correction) power supply comprises one of inductance L, one of capacitor C; Respectively one of common rectifier diode D1, D2, D3, D4, one of filter capacitor C2.

4, the accurate serial-resonant PPFC (Passive Power Factor Correction) of a kind of LC according to claim 3 power supply, it is characterized in that the full-wave rectification D1 in the single-phase buck PPFC (Passive Power Factor Correction) power supply, D2, D3, D4 has 4 terminals (1,2,3,4), one termination, first terminals (1) of capacitor C, the terminals of another termination AC power (5), one termination, second terminals (2) of inductance L, the terminals of another termination AC power (6), the positive pole of capacitor C 2 connects the 3rd terminals (3), negative pole connects the 4th terminals (4), load R cross-over connection is between the 3rd terminals (3) and the 4th terminals (4), AC power is by input between terminals (5) and the terminals (6), and inductance L and capacitor C also can directly be connected, another termination second terminals (2) of capacitor C, another termination power the 6th terminals (6) of inductance L, first terminals (1) are connected with the 5th terminals (5) then.

5, the accurate serial-resonant PPFC (Passive Power Factor Correction) of a kind of LC according to claim 2 power supply, it is characterized in that single-phase step-up formula PPFC (Passive Power Factor Correction) power supply comprises one of inductance L, one of capacitor C, each one of common rectifier diode D5, D6, each one of multiplication of voltage filter capacitor C3 and C4.

6, the accurate serial-resonant PPFC (Passive Power Factor Correction) of a kind of LC according to claim 5 power supply, it is characterized in that single-phase step-up formula PPFC (Passive Power Factor Correction) power supply, its voltage doubling rectifing circuit is by D5, D6 and C3, C4 forms, have 4 terminals (10,11,12,5), inductance L is connected with capacitor C by the 13 terminals (13), another termination AC power the 6th terminals (6) of inductance L, another termination the 11 terminals (11) of capacitor C, load R cross-over connection are between the tenth terminals (10) and the 12 terminals (12), and AC power is by input between the 5th terminals (5) and the 6th terminals (6).

7, the accurate serial-resonant PPFC (Passive Power Factor Correction) of a kind of LC according to claim 2 power supply is characterized in that the three-phase full wave rectifier circuit of three-phase PPFC (Passive Power Factor Correction) comprises that inductance (La, Lb, Lc), electric capacity (Ca, Cb, Cc) and common rectifier diode D7, D8, D9, D10, D11, D12 and filter capacitor C5 form.

8, the accurate serial-resonant PPFC (Passive Power Factor Correction) of a kind of LC according to claim 7 power supply, the three-phase full wave rectifier circuit that it is characterized in that the three-phase PPFC (Passive Power Factor Correction) is by common rectifier diode (D7, D8, D9, D10, D11,12) and filter capacitor C5 form three-phase full wave rectifier circuit, its interchange input point is the 16 terminals (16), the 17 terminals (17) and the 18 terminals (18), its direct current output is between the 14 terminals (14) and the 15 terminals (15), load R cross-over connection is in the 14 terminals (14) and the 15 terminals (15), A, B, the C three-phase, every have mutually: LaCa, LbCb, the accurate series resonant circuit of LcCc, and La=Lb=Lc, Ca=Cb=Cc, after each phase LC series connection, La, Lb, the A that the other end of Lc the connects AC power respectively line end (7) that joins, B line end (8) and the C line end (9) that joins that joins, Ca, Cb, the other end of Cc connects the 16 terminals (16) respectively, the 17 terminals (17), with the 18 terminals (18), three-phase ac power supply is respectively by terminals (7), terminals (8) and terminals (9) input.

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