CN211183825U

CN211183825U - High-power-factor AC/DC converter of symmetrical charge pump

Info

Publication number: CN211183825U
Application number: CN202020264912.0U
Authority: CN
Inventors: 谢勇; 方宇
Original assignee: Yangzhou University
Current assignee: Yangzhou University
Priority date: 2020-03-06
Filing date: 2020-03-06
Publication date: 2020-08-04
Anticipated expiration: 2030-03-06

Abstract

The utility model discloses a symmetry charge pump high power factor AC/DC converter in the power electronic technology field, including input alternating current power supply (Vs), input filter inductance (L1), input filter capacitance (C1), power frequency rectifier bridge (D1-D4) and symmetry charge pump high power factor half-bridge converter, input alternating current power supply (Vs) send into power frequency rectifier bridge (D1-D4) rectification full wave form after input filter inductance (L1) and input filter capacitance (C1) filtering high frequency ripple, and the full wave form after the rectification is input to symmetry charge pump high power factor half-bridge converter, the utility model discloses a symmetrical structure's high frequency charge pump circuit combines together with half-bridge DC/DC converter, forms single-stage high power factor half-bridge DC/DC converter, reduces half-bridge AC/DC converter AC input harmonic component, improves power factor to have low-cost characteristics.

Description

High-power-factor AC/DC converter of symmetrical charge pump

Technical Field

The utility model relates to a power factor converter, in particular to symmetry charge pump high power factor AC/DC converter belongs to power electronic technology field.

Background

The AC/DC converter is widely applied, but the input end of the common AC/DC converter usually adopts a diode rectification filtering method, so that the harmonic component of the AC input end is large, and the power factor is low. To overcome these disadvantages, the industry generally uses a two-stage approach and uses Power Factor Correction (PFC) technology in the first stage and a DC/DC converter in the second stage. Although the two-stage method solves the problem of low power factor, the increase of the number of stages will increase the cost, increase the number of power components, decrease the efficiency and decrease the reliability.

Compared with an active power factor correction circuit, the high-frequency charge pump power factor correction technology realizes PFC by using a charge pump capacitor and a high-frequency alternating current source, so that the circuit structure is simple, the cost is low, and a complex control circuit is not needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a symmetry charge pump high power factor AC DC converter adopts symmetrical structure's high frequency charge pump circuit and half-bridge DC converter to combine together, forms single-stage high power factor half-bridge DC converter, reduces half-bridge AC DC converter AC input end harmonic component, improves power factor to have low-cost characteristics.

The utility model aims at realizing the AC/DC converter with high power factor of the symmetrical charge pump, which comprises an input alternating current power supply (Vs), an input filter inductor (L1), an input filter capacitor (C1), a power frequency rectifier bridge (D1-D4) and a half-bridge converter with high power factor of the symmetrical charge pump;

the symmetrical charge pump high-power-factor half-bridge converter comprises a second inductor (L2), a second capacitor (C2), a fourth capacitor (C4), a fifth diode (D5), a seventh diode (D7), a third inductor (L3), a third capacitor (C3), a fifth capacitor (C5), a sixth diode (D6), an eighth diode (D8), a sixth capacitor (C6), a first power switching tube (M1), a thirteenth diode (D13), a second power switching tube (M2), a fourteenth diode (D14), a seventh capacitor (C7), an eighth capacitor (C8), a transformer (T L1), a high-frequency rectifier bridge (D9-D12), a fourth inductor (L4), a ninth capacitor (C9) and a load (R);

the input alternating current power supply (Vs) is filtered by an input end filter inductor (L1) and an input end filter capacitor (C1) to remove high-frequency ripples, then the high-frequency ripples are sent to a power frequency rectifier bridge (D1-D4) to be rectified into a full-wave waveform, and the rectified full-wave waveform is input to a symmetrical charge pump high-power-factor half-bridge converter.

As a further limitation of the present invention, one end of the input filter inductor (L1) is connected to the positive terminal of the AC power supply (Vs), the other end of the input filter inductor (L1) is connected to the input filter capacitor (C1), the anode of the first diode (D1), and the cathode of the second diode (D2), and the other end of the filter capacitor (C1) is connected to the anode of the third diode (D3), the cathode of the fourth diode (D4), and the negative terminal of the AC power supply (Vs).

As a further limitation of the present invention, one end of the second inductor (2) is connected to the cathode of the first diode (D) and the cathode of the third diode (D), the other end of the second inductor (2) is connected to the anode of the fifth diode (D), the cathode of the seventh diode (D), one end of the second capacitor (C), and one end of the fourth capacitor (C), the other end of the second capacitor (C) is connected to one end of the third capacitor (C), the anode of the seventh diode (D), the cathode of the eighth diode (D), one end of the third inductor (3), the other end of the third capacitor (C) is connected to the anode of the eighth diode (D), the anode of the second diode (D), the anode of the fourth diode (D), the cathode of the sixth diode (D), one end of the fifth capacitor (C), one end of the sixth diode (D), one end of the seventh capacitor (C), the cathode of the first diode (D), one end of the thirteenth power switch (M), the cathode of the sixth diode (D), the cathode of the fifth diode (D), the cathode of the eighth diode (D), the anode of the ninth diode (D), the sixth diode (D), the cathode of the fourteenth diode (D), the cathode of the eighth diode (D), the sixth diode (D), the anode of the cathode of the sixth diode (D), the eighth diode (D), the anode of the fourteenth diode (D), the sixth diode (D), the anode of the sixth diode (D), the cathode of the twelfth diode (D), the cathode of the eighth diode (D), the anode of the twelfth diode (D), the anode of the fourteenth diode (D), the power switch (D), the anode of the source of the fourteenth diode (D), the power switch (D), the anode of the source of the anode of the fourteenth switch (D), the power switch (D), the source of the twelfth diode (D), the anode of the twelfth diode (D), the power switch (D), the fourteenth switch (D) and the source of the power switch (D), the source of the twelfth switch (D), the anode of the power switch (D) of the.

As a further limitation of the present invention, the thirteenth diode (D13) may be a reverse diode or a body diode of the first power switch (M1); the fourteenth diode (D14) may be a body diode or a reverse diode of the second power switch (M2).

As a further limitation of the present invention, the sixth capacitor (C6) is a dc bus capacitor, and the capacitance of the sixth capacitor (C6) is greater than the second capacitor (C2), the third capacitor (C3), the fourth capacitor (C4) and the fifth capacitor (C5), respectively.

As a further limitation of the present invention, the converter employs pulse frequency control.

As a further limitation of the present invention, the input filter inductor (L1), the input filter capacitor (C1), the power frequency rectifier bridge (D1-D4), the second inductor (L2), the second capacitor (C2), the third capacitor (C3), the fourth capacitor (C4), the fifth capacitor (C5), the sixth capacitor (C6), the first power switch tube (M1), the second power switch tube (M2), the fifth diode (D5), the sixth diode (D6), the seventh diode (D7), the eighth diode (D8), the thirteenth diode (D13), and the fourteenth diode (D14) constitute a symmetrical charge pump high power factor correction circuit.

As a further limitation of the present invention, the third inductor (L3) and the second capacitor (C2) and the third capacitor (C3) form a resonance branch in the symmetrical charge pump high power factor correction circuit, and C2= C3, and the fourth capacitor (C4) and the fifth capacitor (C5) form a charge pump capacitor in the symmetrical charge pump high power factor correction circuit, and C4= C5.

As a further limitation of the present invention, the seventh diode (D7) and the eighth diode (D8) are clamping diodes in a power factor correction circuit.

Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model realizes high power factor by introducing symmetrical high-frequency charge pump technology into the traditional half-bridge DC/DC converter, reduces harmonic interference, and can make the harmonic and power factor of the equipment meet the relevant national standard; due to the adoption of the symmetrical charge pump structure, the frequency of the ripple current passing through the second inductor is doubled, and the ripple current is smaller when the inductance value is kept unchanged; because the symmetrical high-frequency charge pump circuit does not need to additionally increase a power switch, but only uses a high-frequency inductor and a high-frequency capacitor with small volume, the whole device does not need to additionally increase the cost and the volume; compared with a two-stage circuit scheme, the method not only keeps better performance, but also has higher economic and social benefits. The utility model discloses can be used to the occasion that needs DC power supply among the electronic equipment in fields such as industry, communication and domestic appliance.

Drawings

Fig. 1 is a general topology diagram of the present invention.

Fig. 2 is a schematic diagram of the working waveform (simulation) of the topology circuit of the present invention.

Fig. 3 is a schematic diagram of the operation before the topology mode t0 of the present invention.

Fig. 4 is a schematic diagram of the topology mode t 0-t 1 according to the present invention.

Fig. 5 is a schematic diagram of the topology mode t 1-t 2 according to the present invention.

Fig. 6 is a schematic diagram of the topology mode t 2-t 3 according to the present invention.

Fig. 7 is a schematic diagram of the topology mode t 3-t 4 according to the present invention.

Fig. 8 shows the simulation result of the present invention.

Detailed Description

To further illustrate the content and features of the present invention, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings.

The technical idea of the utility model is that: a symmetrical high-frequency charge pump technology is combined with a half-bridge DC/DC converter, two charge pump circuits with the same structure are utilized to form a symmetrical charge pump circuit, and a power switch in the half-bridge DC/DC converter is also used in the symmetrical high-frequency charge pump circuit, so that a symmetrical charge pump AC/DC converter is formed.

The present invention is described in detail as follows:

as shown in FIG. 1, the utility model discloses an input alternating current power supply (Vs), input filter inductance (L1), input filter capacitance (C1), power frequency rectifier bridge (D1-D4), second inductance (L2), second electric capacity (C2), fourth electric capacity (C4), fifth diode (D5), seventh diode (D7), third inductance (L3), third electric capacity (C3), fifth electric capacity (C5), sixth diode (D6), eighth diode (D8), sixth electric capacity (C6), first power switch tube (M1), thirteenth diode (D13), second power switch tube (M2), fourteenth diode (D14), seventh electric capacity (C7), eighth electric capacity (C8), transformer (T L1), high frequency rectifier bridge (D9-D12), fourth inductance (L4), ninth electric capacity (C9) and the symmetrical DC/AC load type converter that the load (R9) constitutes.

The main technical principle is that an input alternating current power supply (Vs) is sequentially connected with an input end filter inductor (1), an input end filter capacitor (C), a power frequency rectifier bridge (D-D), a second inductor (2), a second capacitor (C), a fourth capacitor (C), a fifth diode (D), a seventh diode (D), a third inductor (3), a third capacitor (C), a fifth capacitor (C), a sixth diode (D), an eighth diode (D), a sixth capacitor (C), a first power switch tube (M), a thirteenth diode (D), a second power switch tube (M), a fourteenth diode (D), a seventh capacitor (C), an eighth capacitor (C), a transformer (T1), a high-frequency rectifier bridge (D-D), a fourth inductor (4), a ninth capacitor (C) and a load (R), the input alternating current power supply (Vs) is fed into a high-frequency rectifier bridge (D-D) through the filter input end filter inductor (1) and the filter input end capacitor (C), the high-frequency rectifier bridge (C-D), a full-wave rectifier bridge (C), a full-frequency rectifier diode (D), a full-wave rectifier bridge (C), a full-bridge (C) and a full-frequency rectifier, a full-bridge (D), a full-frequency rectifier, a full-wave rectifier, a full-frequency rectifier, a full-wave rectifier, a transformer, a full-frequency rectifier, a full-wave rectifier, a full.

One end of the input end filter inductor (L1) is connected with one end of an alternating current power supply (Vs), the other end of the input end filter inductor (L1) is connected with the input end filter capacitor (C1), the anode of the first diode (D1) and the cathode of the second diode (D2), and the other end of the filter capacitor (C1) is connected with the anode of the third diode (D3), the cathode of the fourth diode (D4) and the other end of the input alternating current power supply (Vs).

One end of a second inductor (2) is connected with the cathode of a first diode (D), the cathode of a third diode (D), the other end of the second inductor (2) is connected with the anode of a fifth diode (D), the cathode of a seventh diode (D), one end of a second capacitor (C) and one end of a fourth capacitor (C), the other end of the second capacitor (C) is connected with one end of the third capacitor (C), the anode of the seventh diode (D), the cathode of an eighth diode (D) and one end of a third inductor (3), the other end of the third capacitor (C) is connected with the anode of an eighth diode (D), the anode of the second diode (D), the anode of the fourth diode (D), the cathode of a sixth diode (D) and one end of a fifth capacitor (C), one end of the sixth capacitor (C), one end of the seventh capacitor (C), one end of a drain of a first power switch tube (M), the cathode of a thirteenth diode (D), the cathode of the sixth capacitor (D), the cathode of the sixth diode (D), the anode of the fifth diode (D), the anode of the eighth diode (D), the anode of the ninth capacitor (D), the eighth capacitor (D), the anode of the ninth capacitor (D), the anode of the twelfth capacitor (D), the power switch (D), the anode of the power switch (D), the anode of the power switch (D), the anode of the power switch (D), the cathode of the anode of the power switch (D), the power switch (D) of the anode of the power switch (D) and the power switch of the power switch, the power switch of the power switch (D) of the power switch, the power switch of the anode.

The thirteenth diode (D13) may be a body diode or a reverse diode of the first power switch (M1); the fourteenth diode (D14) of (a) may be an anti-parallel diode or a body diode of the second power switch (M2).

The sixth capacitor (C6) is a direct current bus capacitor, and C6> > C2, C6> > C3, C6> > C4, C6> > C5.

The high-power-factor correction circuit comprises an input end filter inductor (L1), an input end filter capacitor (C1), a power frequency rectifier bridge (D1-D4), a second inductor (L2), a second capacitor (C2), a third capacitor (C3), a fourth capacitor (C4), a fifth capacitor (C5), a sixth capacitor (C6), a first power switch tube (M1), a second power switch tube (M2), a fifth diode (D5), a sixth diode (D6), a seventh diode (D7), an eighth diode (D8), a thirteenth diode (D13) and a fourteenth diode (D14).

The third inductor (L3) and the second capacitor (C2) and the third capacitor (C3) form a resonant branch in the symmetrical charge pump power factor correction circuit, and C2= C3.

The fourth capacitor (C4) and the fifth capacitor (C5) form a charge pump capacitor in the symmetrical charge pump power factor correction circuit, and C4= C5.

The fifth diode (D5) and the sixth diode (D6) provide channels for transferring the energy of the resonant branch in the power factor correction circuit to the direct current bus capacitor (C6).

The seventh diode (D7) and the eighth diode (D8) are clamping diodes in the power factor correction circuit.

The current flowing in the second inductor (L2) tracks the input voltage during each switching cycle, enabling power factor correction.

The power supply comprises a first power switch tube (M1), a second power switch tube (M2), a thirteenth diode (D13), a fourteenth diode (D14), a seventh capacitor (C7), an eighth capacitor (C8), a transformer (T L1), a high-frequency rectifier bridge (D9-D12), a fourth inductor (L4), a ninth capacitor (C9) and a load (R), wherein half-bridge DC/DC conversion is achieved, and C7= C8.

The switching frequency of the first power switch tube (M1) and the second power switch tube (M2) is higher than the resonant frequency of a resonant circuit consisting of the third inductor (L3), the second capacitor (C2) and the third capacitor (C3);

the converter employs pulse frequency control.

Next, the specific operation principle of the present invention will be described with reference to fig. 3 to 7 by using the main circuit structure shown in fig. 1 and the operation waveform shown in fig. 2, and fig. 2 and 8 are simulation results of the symmetrical charge pump AC/DC converter.

Fig. 3 shows an equivalent circuit before t0, wherein M2, D6 and D8 are turned on, a current I L3 in a third inductor (L3) flows through M2, D6 and D8 on one hand, and charges C2 on the other hand, and a difference current between a current I L2 in a second inductor (L2) and a current flowing through C2 discharges C4.

Fig. 4 shows an equivalent circuit in a period from t0 to t1, at a time t0, M2 is turned off, a current I L3 flows through D13, C6, D6 and D8, a current I L3 starts to decrease, currents in D6 and D8 also correspondingly decrease, C2 is still in a charging state, C4 is in a discharging state, when D13 is turned on, M1 is turned on, M1 can realize zero-voltage zero-current turn-on, when the current in I L3 decreases to zero, the period ends, and at the same time, the currents in D6 and D8 also decrease to zero successively and turn off.

Fig. 5 shows the equivalent circuit during the period t 1-t 2, at t 1M 1 is turned on, I L current flows through M1 in reverse direction, charging C3, C5, causing the voltage on C3, C5 to rise, since C2 is still in the charging state, the voltage on C2 rises to the maximum value, at this stage, C4 is still in the discharging state, and when the voltage across C4 drops to zero, this stage ends.

Fig. 6 shows an equivalent circuit in a period from t2 to t3, at a time t2, the voltage across C4 is discharged to zero to turn on D5, the current I L3 discharges C2 through D5 and M1 on the one hand, and continues to charge C3 and C5 on the other hand, so that the voltages on C3 and C5 continuously rise, and the voltage on C2 continuously falls, when the voltage on C2 falls to zero, this stage ends, and the voltage on C5 rises to a maximum value at this time.

Fig. 7 shows an equivalent circuit during the period t 3-t 4, when the voltage across C2 drops to zero, D7 starts to conduct and current I L3 flows through D7, D5 and M1 on the one hand and charges C3 on the other hand, the voltage across C5 drops as the difference between the current in the second inductor (L2) and the current in C3 discharges C5, and this phase ends when M1 is turned off.

Before t0, due to the conduction of M2, D9 and D12 in the later stage half bridge circuit are conducted, and between t0 and t4, due to the conduction of M1 or D13, D10 and D11 in the half bridge circuit are conducted, and after full bridge rectification by diodes and filtering by L4 and C9, the required direct current voltage is output to the load.

Due to the symmetry of the circuit, the working condition of the second half cycle is similar to that of the first half cycle, and is not described in detail.

As can be seen from the simulation results shown in fig. 8, the ac input terminal current is in phase with the ac input voltage, the input current has better sine property, the input terminal power factor is close to the level of 1, and the output dc voltage is stabilized at the design value.

The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some replacements and transformations for some technical features without creative labor according to the disclosed technical contents, and these replacements and transformations are all within the protection scope of the present invention.

Claims

1. A symmetrical charge pump high power factor AC/DC converter is characterized by comprising an input alternating current power supply (Vs), an input end filter inductor (L1), an input end filter capacitor (C1), a power frequency rectifier bridge (D1-D4) and a symmetrical charge pump high power factor half-bridge converter;

the symmetrical charge pump high-power-factor half-bridge converter comprises a second inductor (L2), a second capacitor (C2), a fourth capacitor (C4), a fifth diode (D5), a seventh diode (D7), a third inductor (L3), a third capacitor (C3), a fifth capacitor (C5), a sixth diode (D6), an eighth diode (D8), a sixth capacitor (C6), a first power switching tube (M1), a thirteenth diode (D13), a second power switching tube (M2), a fourteenth diode (D14), a seventh capacitor (C7), an eighth capacitor (C8), a transformer (T L1), a high-frequency rectifier bridge (D9-D12), a fourth inductor (L4), a ninth capacitor (C9) and a load resistor (R);

2. The symmetrical charge-pump high power factor AC/DC converter according to claim 1, wherein one end of the input filter inductor (L1) is connected to the positive pole of the AC power source (Vs), the other end of the input filter inductor (L1) is connected to the input filter capacitor (C1), the anode of the first diode (D1), the cathode of the second diode (D2), and the other end of the filter capacitor (C1) is connected to the anode of the third diode (D3), the cathode of the fourth diode (D4), and the negative pole of the AC power source (Vs).

3. The symmetrical charge pump high power factor AC/DC converter according to claim 1, wherein one end of the second inductor (2) is connected to a cathode of the first diode (D) and a cathode of the third diode (D), the other end of the second inductor (2) is connected to an anode of the fifth diode (D), a cathode of the seventh diode (D), one end of the second capacitor (C), and one end of the fourth capacitor (C), the other end of the second capacitor (C) is connected to one end of the third capacitor (C), an anode of the seventh diode (D), a cathode of the eighth diode (D), one end of the third inductor (3), the other end of the third capacitor (C) is connected to an anode of the eighth diode (D), an anode of the second diode (D), an anode of the fourth diode (D), a cathode of the sixth diode (D), one end of the fifth capacitor (C), one end of the fourth capacitor (C), the other end of the fourth capacitor (C) is connected to an anode of the fifth diode (D), one end of the sixth diode (C), one end of the seventh diode (D), an anode of the sixth diode (D), one end of the sixth diode (D), a cathode of the sixth diode (D), an anode of the sixth diode (D), a cathode of the eighth diode (D), an anode of the fourteenth diode (D) and a cathode of the eighth diode (D), a cathode of the eighth diode (D) is connected to an anode of the eighth diode (D), a cathode of the eighth diode (D), a transformer (D), a cathode of the transformer (D), a drain of the transformer (D) is connected to a drain of the eighth diode (D) and a drain of the transformer (D), a drain of the ninth diode (D) and a drain of the fourteenth diode (D) and a drain of the twelfth diode (D) and a drain of the transformer (D) and a cathode of the transformer (D) and a drain of the transformer (D) and a cathode of the twelfth diode (D) and a drain of the twelfth diode (D) and a transformer (D) and a cathode of the transformer (D) and a drain of the transformer (D) and a power switch (D.

4. A symmetric charge pump high power factor AC/DC converter according to any of claims 1-3, characterized in that: the thirteenth diode (D13) may be a reverse diode or a body diode of the first power switch (M1); the fourteenth diode (D14) may be a body diode or a reverse diode of the second power switch (M2).

5. A symmetric charge pump high power factor AC/DC converter according to any of claims 1-3, characterized in that: the sixth capacitor (C6) is a direct current bus capacitor, and the capacitance of the sixth capacitor (C6) is respectively larger than that of the second capacitor (C2), the third capacitor (C3), the fourth capacitor (C4) and the fifth capacitor (C5).

6. A symmetric charge pump high power factor AC/DC converter according to any of claims 1-3, characterized in that: the converter is controlled by a pulse frequency.

7. The symmetrical charge pump high power factor AC/DC converter according to any one of claims 1-3, wherein the input filter inductor (L1), the input filter capacitor (C1), the power frequency rectifier bridge (D1-D4), the second inductor (L2), the second capacitor (C2), the third capacitor (C3), the fourth capacitor (C4), the fifth capacitor (C5), the sixth capacitor (C6), the first power switch tube (M1), the second power switch tube (M2), the fifth diode (D5), the sixth diode (D6), the seventh diode (D7), the eighth diode (D8), the thirteenth diode (D13), and the fourteenth diode (D14) form a symmetrical charge pump high power factor correction circuit.

8. The symmetrical charge pump high power factor AC/DC converter according to any of claims 1-3, wherein the third inductor (L3) forms a resonant branch with the second capacitor (C2) and the third capacitor (C3) in the symmetrical charge pump high power factor correction circuit, and C2= C3, and the fourth capacitor (C4) and the fifth capacitor (C5) form a charge pump capacitor in the symmetrical charge pump high power factor correction circuit, and C4= C5.

9. A symmetric charge pump high power factor AC/DC converter according to any of claims 1-3, characterized in that: the seventh diode (D7) and the eighth diode (D8) are clamping diodes in a power factor correction circuit.