Single-stage resonant AC-DC power factor correction conversion device and correction method thereof
阅读说明：本技术 一种单级谐振式ac-dc功率因数校正变换装置及其校正方法 (Single-stage resonant AC-DC power factor correction conversion device and correction method thereof ) 是由 张志� 孟利伟 于 2019-08-22 设计创作，主要内容包括：本发明公开了一种单级谐振式AC-DC功率因数校正变换装置及其校正方法,该装置包括整流桥、主开关管、主开关管寄生电容、辅开关管、辅开关管寄生电容、谐振电容、谐振电感、钳位电容；通过有源钳位技术,将主开关管的电压应力钳制,使主开关管和辅开关管均能实现零电压开关,输出二极管可以实现零电流开关；本装置由于加入软开关技术,减小了开关损耗,从而提高了变换装置的效率和功率密度,有效抑制了并网测电流畸变,获得THD较低的电流波形,同时降低EMI,改善了电磁兼容。(The invention discloses a single-stage resonant AC-DC power factor correction conversion device and a correction method thereof, wherein the device comprises a rectifier bridge, a main switching tube parasitic capacitor, an auxiliary switching tube parasitic capacitor, a resonant inductor and a clamping capacitor; the voltage stress of the main switching tube is clamped through an active clamping technology, so that the main switching tube and the auxiliary switching tube can realize zero-voltage switching, and the output diode can realize zero-current switching; the device reduces the switching loss due to the addition of a soft switching technology, thereby improving the efficiency and power density of the conversion device, effectively inhibiting the distortion of grid-connected measuring current, obtaining a current waveform with lower THD, simultaneously reducing EMI and improving electromagnetic compatibility.)
1. A single-stage resonant AC-DC power factor correction conversion device is characterized by comprising a rectifier bridge, an input inductor, a main switching tube parasitic capacitor, an auxiliary switching tube parasitic capacitor, a resonant inductor and a clamping capacitor;
the input end of the rectifier bridge is connected with a grid-connected side alternating current power supplyOne of the output ends of the rectifier bridge is sequentially connected with the input inductor, the drain electrode of the main switch tube, one end of the clamping capacitor, the resonant capacitor, one end of the resonant inductor and D1One end of a diode and an output capacitor; the other output end of the rectifier bridge is sequentially connected with the source electrode of the main switch tube, the drain electrode of the auxiliary switch tube and D2The anode of the diode and the other end of the output capacitor; the other end of the resonance inductor is connected with D2The other end of the clamping capacitor is connected with the source electrode of the auxiliary switching tube; two ends of the parasitic capacitor of the main switching tube are respectively connected with the drain electrode and the source electrode of the main switching tube; two ends of the auxiliary switch tube parasitic capacitor are respectively connected with the drain electrode and the source electrode of the auxiliary switch tube; and two ends of the output capacitor are connected with a load.
2. The single-stage resonant AC-DC pfc converter apparatus of claim 1, wherein the rectifier bridge is an uncontrollable diode rectifier bridge comprising 4 diodes.
3. The single-stage resonant AC-DC power factor correction converter device of claim 1, wherein the main and auxiliary switching tubes are power switching tubes with anti-parallel body diodes.
4. The single-stage resonant AC-DC power factor correction converter according to claim 1, further comprising a high-frequency transformer, wherein one end of the resonant capacitor and the drain of the auxiliary switching tube are connected to a primary side of the high-frequency transformer, and a secondary side of the high-frequency transformer is connected to one end of the resonant inductor and the D through a secondary capacitor2The anode of the diode is connected.
5. A correction method of single-stage resonant AC-DC power factor correction conversion device based on any one of claims 1-4, characterized by controlling the on-off of the main switch tube and the auxiliary switch tube in the duty cycle t0-t7, wherein the duty cycle is during the duty cyclePeriod t0-t7The inner part of the device comprises the following working modes:
a. time t0-t1The first modality of (2):
the anti-parallel diode of the main switching tube starts to be conducted and clamps the switching current of the main switching tube, and the gate pole signal enables the main switching tube to be switched on at zero voltage;
b. time t1-t2The second modality of (2):
LC resonance occurs between the resonance inductor and the resonance capacitor, and when the current of the resonance inductor is reduced to 0, D is2The diode realizes zero current turn-off;
c. time t2-t3The third modality of (2):
D2when the diode stops conducting and a resonant circuit consisting of a resonant inductor and a resonant capacitor has no current, the current of the input inductor starts to rise linearly, and the input inductor starts to charge until the main switching tube is turned off;
d. time t3-t4The fourth modality of (2):
the anti-parallel body diode of the auxiliary switch tube starts to be conducted and clamps the switch current of the auxiliary switch tube;
time t4-t5The fifth modality of (2):
after the anti-parallel body diode of the auxiliary switching tube starts to be conducted and the switching current of the auxiliary switching tube is clamped, a gate pole signal is applied to enable the auxiliary switching tube to be conducted at zero voltage;
e. time t5-t6The sixth modality of (1):
when the resonant inductor current is equal to the resonant capacitor current, the direction of the current flowing through the auxiliary switching tube is changed to flow from the drain electrode to the source electrode until the auxiliary switching tube is turned off;
f. time t6-t7The seventh modality:
the input inductor charges the auxiliary switch tube parasitic capacitor, the main switch tube parasitic capacitor discharges, and the next switching period starts until the auxiliary switch tube parasitic capacitor is fully charged and the main switch tube parasitic capacitor discharges.
6. Correction method according to claim 5, characterized in thatIn the first mode, an inductor current i is inputL(t) is:
wherein iL(t) is the input inductor current at time t, L is the input inductor, iL(t0) Is t0Input inductor current at time, VinIs the input voltage of the device.
7. The correction method according to claim 5, characterized in that in the second mode, a resonance capacitance voltage VCr(t) is:
VCr(t)＝VCr(t1)cosω(t-t1)+[iL(t1)-is1(t1)]Z
wherein the content of the first and second substances,
resonant inductor current iLr(t) is:
8. the correction method according to claim 5, characterized in that in the fourth mode, an input inductor current iLn(t) is:
iLn(t) is the input inductor current at time t, VinIs the input voltage of the device, VCcIs an input DC voltage, L is an input inductance, iL(t3) Is t3The input inductor current at a time.
Technical Field
The invention relates to the technical field of power factor correction converters, in particular to a single-stage resonant AC-DC power factor correction conversion device and a correction method thereof.
Background
The AC-DC converter has become an indispensable electronic device in industrial applications such as computers, electric automobile charging and communication power supplies, and the single-phase power factor correction converter is a main way for solving harmonic pollution of a power grid at present. The traditional AC-DC power factor correction conversion device adopts a cascaded two-stage topology, wherein a front-stage AC/DC part is used for rectification and power factor correction, and a rear-stage DC/DC part is used for realizing isolation and output voltage adjustment.
Disclosure of Invention
The invention provides a single-stage resonant AC-DC power factor correction conversion device, which aims to solve the problems of complex topology, higher cost and lower overall efficiency of the conventional AC-DC power factor correction conversion device.
In order to achieve the above purpose, the technical means adopted is as follows:
a single-stage resonant AC-DC power factor correction conversion device comprises a rectifier bridge, an input inductor, a main switching tube parasitic capacitor, an auxiliary switching tube parasitic capacitor, a resonant inductor and a clamping capacitor;
the input end of the rectifier bridge is connected with the output end of the grid-connected side alternating current power supply, one of the output ends of the rectifier bridge is sequentially connected with the input inductor, the drain electrode of the main switch tube, one end of the clamping capacitor, the resonant capacitor, one end of the resonant inductor and D1One end of a diode and an output capacitor; the other output end of the rectifier bridge is sequentially connected with the source electrode of the main switch tube, the drain electrode of the auxiliary switch tube and D2The anode of the diode and the other end of the output capacitor; the other end of the resonance inductor is connected with D2The other end of the clamping capacitor is connected with the source electrode of the auxiliary switching tube; two ends of the parasitic capacitor of the main switching tube are respectively connected with the drain electrode and the source electrode of the main switching tube; two ends of the auxiliary switch tube parasitic capacitor are respectively connected with the drain electrode and the source electrode of the auxiliary switch tube; and two ends of the output capacitor are connected with a load.
Preferably, the rectifier bridge is an uncontrollable diode rectifier bridge comprising 4 diodes.
Preferably, the main switch tube and the auxiliary switch tube are power switch tubes with anti-parallel body diodes.
Preferably, the apparatus further comprises a high frequency transformer, one end of the resonant capacitor and the auxiliary switch tubeThe drain electrode of the high-frequency transformer is connected with the primary side of the high-frequency transformer, and the secondary side of the high-frequency transformer is connected with one end of the resonance inductor and the D through a secondary side capacitor2The anode of the diode is connected.
The invention also provides a correction method applied to the single-stage resonant AC-DC power factor correction conversion device, which is used for correcting the single-stage resonant AC-DC power factor in the working period t0-t7The on-off of the main switch tube and the auxiliary switch tube is controlled internally, and the working period t is0-t7The inner part of the device comprises the following working modes:
a. time t0-t1The first modality of (2):
the anti-parallel diode of the main switching tube starts to be conducted and clamps the switching current of the main switching tube, and the gate pole signal enables the main switching tube to be switched on at zero voltage;
b. time t1-t2The second modality of (2):
LC resonance occurs between the resonance inductor and the resonance capacitor, and when the current of the resonance inductor is reduced to 0, D is2The diode realizes zero current turn-off;
c. time t2-t3The third modality of (2):
D2when the diode stops conducting and a resonant circuit consisting of a resonant inductor and a resonant capacitor has no current, the current of the input inductor starts to rise linearly, and the input inductor starts to charge until the main switching tube is turned off;
d. time t3-t4The fourth modality of (2):
the anti-parallel body diode of the auxiliary switch tube starts to be conducted and clamps the switch current of the auxiliary switch tube;
time t4-t5The fifth modality of (2):
after the anti-parallel body diode of the auxiliary switching tube starts to be conducted and the switching current of the auxiliary switching tube is clamped, a gate pole signal is applied to enable the auxiliary switching tube to be conducted at zero voltage;
e. time t5-t6The sixth modality of (1):
when the resonant inductor current is equal to the resonant capacitor current, the direction of the current flowing through the auxiliary switching tube is changed to flow from the drain electrode to the source electrode until the auxiliary switching tube is turned off;
f. time t6-t7The seventh modality:
the input inductor charges the auxiliary switch tube parasitic capacitor, the main switch tube parasitic capacitor discharges, and the next switching period starts until the auxiliary switch tube parasitic capacitor is fully charged and the main switch tube parasitic capacitor discharges.
Preferably, in the first mode, the inductor current i is inputL(t) is:
wherein iL(t) is the input inductor current at time t, L is the input inductor, iL(t0) Is t0Input inductor current at time, VinIs the input voltage of the device.
Preferably, in the second mode, the resonant capacitor voltage VCr(t) is:
VCr(t)＝VCr(t1)cosω(t-t1)+[iL(t1)-is1(t1)]Z
wherein the content of the first and second substances,
resonant inductor current iLr(t) is:
preferably, in the fourth mode, the inductor current i is inputLn(t) is:
iLn(t) is the input inductor current at time t, VinIs the input voltage of the device, VCcIs an input DC voltage, L is an input inductance, iL(t3) Is t3The input inductor current at a time.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the single-stage resonant AC-DC power factor correction conversion device and the correction method thereof clamp the voltage stress of the main switching tube by the active clamping technology, so that the main switching tube and the auxiliary switching tube can realize zero-voltage switching, D2The diode can realize zero-current switching; the device reduces the switching loss due to the addition of a soft switching technology, thereby improving the efficiency and power density of the conversion device, effectively inhibiting the distortion of grid-connected measuring current, obtaining a current waveform with lower THD, simultaneously reducing EMI and improving electromagnetic compatibility.
Drawings
Fig. 1 is an overall circuit diagram of a single-stage resonant AC-DC power factor correction conversion device according to
FIG. 2 is a circuit implementation diagram of an average current control strategy for implementing a 1-stage resonant AC-DC PFC converter;
FIG. 3 is a waveform diagram showing the operation of the correction method of the single-stage resonant AC-DC PFC converter according to
fig. 4 is a first mode operation diagram of a correction method of a single-stage resonant AC-DC power factor correction conversion apparatus according to
FIG. 5 is a second mode operation diagram of the correction method of the single-stage resonant AC-DC PFC converter according to
fig. 6 is a third mode operation diagram of the correction method of the single-stage resonant AC-DC power factor correction conversion apparatus according to the
fig. 7 is a fourth mode operation diagram of the correction method of the single-stage resonant AC-DC power factor correction conversion apparatus according to the
fig. 8 is a schematic diagram illustrating the operation of clamping the switching current by the anti-parallel diode of the auxiliary switching tube in the fourth mode of the correction method of the single-stage resonant AC-DC power factor correction converter according to the
fig. 9 is a schematic diagram of a fifth mode operation of the correction method of the single-stage resonant AC-DC power factor correction converter of
fig. 10 is a diagram illustrating a sixth mode operation of the correction method of the single-stage resonant AC-DC power factor correction converter according to the
fig. 11 is a schematic diagram of a seventh mode operation of the correction method of the single-stage resonant AC-DC power factor correction converter according to the
FIG. 12 is an equivalent circuit diagram of a 2-stage resonant AC-DC PFC converter during start-up;
fig. 13 is an overall circuit diagram of a single-stage resonant AC-DC power factor correction converter according to
Fig. 14 is a simulation experiment result diagram of the single-stage resonant AC-DC power factor correction converter according to
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
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