CN114123821A - Active power decoupling method of AC/DC converter circuit - Google Patents

Active power decoupling method of AC/DC converter circuit Download PDF

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Publication number
CN114123821A
CN114123821A CN202111320412.XA CN202111320412A CN114123821A CN 114123821 A CN114123821 A CN 114123821A CN 202111320412 A CN202111320412 A CN 202111320412A CN 114123821 A CN114123821 A CN 114123821A
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diode
switch tube
series
bus capacitor
circuit
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单振宇
司雨菲
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Beihang University
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Beihang University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The present disclosure relates to an active power decoupling method for an AC/DC converter circuit. Wherein, the method comprises the following steps: sampling the output voltage of the AC/DC converter circuit, and comparing the generated sampling voltage with a preset reference value; and when the sampling voltage is greater than the reference value, the third switching tube and the fourth switching tube are simultaneously conducted, so that the first bus capacitor and the second bus capacitor of the AC/DC converter circuit output power to the leakage inductance of the transformer, and decoupling between the output power and the bus voltage is realized. According to the single-phase AC/DC converter circuit based on the power convergence control, active power decoupling between output power and bus voltage can be achieved through simple control, the capacitance capacity is reduced, the output instantaneous power of the converter is averaged, and the purpose of decoupling the output power and the DC bus voltage is achieved.

Description

Active power decoupling method of AC/DC converter circuit
Technical Field
The disclosure relates to the field of power electronics, in particular to an active power decoupling method of an AC/DC converter circuit.
Background
The single-phase rectification power supply has the function of converting the alternating current of a power grid into the direct current required by electronic equipment, and is widely applied to household electronic equipment such as computers, mobile phone charging adapters and the like. The AC/DC converter is an indispensable part of a rectified power supply system, and functions to realize power factor correction and output voltage regulation. Under the condition of unit power factor, the input power of the power amplifier contains double power frequency pulsation. However, because the output power required by the load is constant, the conventional AC/DC converter adopts a large-capacity electrolytic capacitor to absorb the inherent double frequency power pulsation, so as to realize input and output power decoupling, thereby ensuring that the output voltage is constant. However, the large-capacity electrolytic capacitor has a large volume and a short service life, and has a risk of liquid leakage under high-temperature and high-pressure conditions, so that an active power decoupling method needs to be adopted, and the capacity requirement of the capacitor is reduced.
In order to eliminate electrolytic capacitors in a system, most of existing solutions are methods of adding an auxiliary circuit on the basis of a main circuit, so as to achieve the purposes of absorbing pulsating power and reducing capacitance value of the capacitor. Through the combination of the auxiliary circuit and the small-capacity capacitor, when the input power is larger than the output power, the ripple power is transferred to the small-capacity capacitor through the auxiliary circuit. Therefore, active power decoupling without electrolytic capacitor is realized. Then, the existing method has the defects that additional elements need to be added, a complex auxiliary circuit control strategy needs to be adopted, the system volume can be increased by the auxiliary circuit, and the like, and is not beneficial to wide application and popularization.
Accordingly, there is a need for one or more methods to address the above-mentioned problems.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
It is an object of the present disclosure to provide an active power decoupling method of an AC/DC converter circuit, thereby overcoming, at least to some extent, one or more of the problems due to the limitations and disadvantages of the related art.
According to an aspect of the present disclosure, there is provided an active power decoupling method of an AC/DC converter circuit, the AC/DC converter circuit being configured by a preceding stage totem pole Power Factor Correction (PFC) circuit and a succeeding stage DC/DC converter circuit by multiplexing a first switching tube, a second switching tube, and first and second bus capacitors, the method comprising:
sampling the output voltage of the AC/DC converter circuit to generate a sampling voltage, and comparing the sampling voltage with a preset reference value;
when the sampling voltage is smaller than the reference value, alternately conducting a third switch tube and a fourth switch tube of the AC/DC converter circuit to enable a first bus capacitor and a second bus capacitor of the AC/DC converter circuit to output power to a load;
and when the sampling voltage is greater than the reference value, simultaneously conducting a third switch tube and a fourth switch tube of the AC/DC converter circuit, enabling a first bus capacitor and a second bus capacitor of the AC/DC converter circuit to output power to a leakage inductance of a transformer, enabling the DC/DC converter circuit to output power to a load as preset power, and achieving decoupling between the output power and the bus voltage.
In an exemplary embodiment of the disclosure, when the sampling voltage is smaller than a reference value, according to a current direction at an output end of the third filter inductor, the third switch tube and the fourth switch tube of the AC/DC converter circuit are alternately turned on, so that the first bus capacitor and the second bus capacitor of the AC/DC converter circuit output power to a load.
In an exemplary embodiment of the present disclosure, the method further comprises:
the first switch tube and the second switch tube are conducted complementarily at a duty ratio of 0.5, so that the circuit works in a Discontinuous Conduction Mode (DCM).
In an exemplary embodiment of the present disclosure, the method further comprises:
the input power of the PFC stage circuit is adjusted by controlling the switching frequency of the first switching tube and the second switching tube, so that the average value of the direct current bus capacitor voltage in a double frequency period is kept constant.
In one aspect of the present disclosure, an AC/DC converter circuit is provided, including an electromagnetic interference (EMI) filter circuit, a totem pole Power Factor Correction (PFC) circuit, a DC/DC converter circuit, wherein:
the EMI filter circuit comprises a first filter inductor and a first filter capacitor, wherein the first filter inductor is connected with one end of an input voltage source in series and then is connected with one end of the first filter capacitor, and the other end of the first filter capacitor is connected with the other end of the input voltage source;
the totem pole PFC circuit comprises a second filter inductor, a first switch tube, a second switch tube, a first diode, a second diode, a first bus capacitor and a second bus capacitor, wherein one end of the second filter inductor is connected with the connection point of the first filter inductor and the first filter capacitor of the EMI filter circuit, the other end of the second filter inductor is connected with the midpoint of the first switch tube and the second switch tube after being connected in series, the two ends of the first switch tube and the second switch tube after being connected in series are respectively connected with the two ends of the first diode and the second diode after being connected in series, and the two ends of the first bus capacitor after being connected in series with the second bus capacitor are connected in parallel, the midpoint of the first diode and the second diode after being connected in series is connected with the connection point of the other end of the first filter capacitor of the EMI filter circuit and the other end of the input voltage source;
the DC/DC conversion circuit comprises a first switch tube, a second switch tube, a first diode, a second diode, a first bus capacitor, a second bus capacitor, a transformer, a third filter inductor, a third switch tube, a fourth switch tube, a third diode, a fourth diode and a third bus capacitor, wherein the first switch tube, the second switch tube, the first diode, the second diode, the first bus capacitor and the second bus capacitor are multiplexed with the totem-pole PFC circuit, one end of the primary side of the transformer is connected with the midpoint of the totem-pole PFC circuit after the first switch tube and the second switch tube are connected in series, the other end of the primary side of the transformer is connected with the midpoint of the totem-pole PFC circuit after the first bus capacitor and the second bus capacitor are connected in series, one end of the secondary side of the transformer is connected with one end of the third inductor in series, the other end of the third inductor is connected with the midpoint of the third diode and the third switch tube in series, the other end of the secondary side of the transformer is connected with the middle point of the fourth diode after being connected with the fourth switch tube in series, and the two ends of the third diode after being connected with the third switch tube in series are respectively connected with the two ends of the fourth diode after being connected with the fourth switch tube in series and the third bus capacitor in parallel.
In an exemplary embodiment of the present disclosure, the single-phase AC/DC converter circuit further includes:
a load connected in parallel with a third bus capacitance of the DC/DC conversion circuit.
In an exemplary embodiment of the present disclosure, the conducting direction of the first diode is from a middle point of the first diode and the second diode after being connected in series to the parallel connection point;
the conduction direction of the second diode is from the parallel connection point of the first diode and the second diode after being connected in series to the direction of the series midpoint of the first diode and the second diode;
the conducting direction of the third diode is from the middle point of the third diode and the third switching tube after being connected in series to the direction of the parallel connection point;
and the conduction direction of the fourth diode is from the middle point of the fourth switch tube after being connected in series with the fourth switch tube to the parallel connection point.
In an exemplary embodiment of the disclosure, the first bus capacitor and the second bus capacitor may be non-electrolytic capacitors.
A method of active power decoupling for an AC/DC converter circuit in an exemplary embodiment of the present disclosure, the method comprising: sampling the output voltage of the AC/DC converter circuit, and comparing the generated sampling voltage with a preset reference value; and when the sampling voltage is greater than the reference value, the third switching tube and the fourth switching tube are simultaneously conducted, so that the first bus capacitor and the second bus capacitor of the AC/DC converter circuit output power to the leakage inductance of the transformer, and decoupling between the output power and the bus voltage is realized. According to the single-phase AC/DC converter circuit based on the power convergence control, active power decoupling between output power and bus voltage can be achieved through simple control, the capacitance capacity is reduced, the output instantaneous power of the converter is averaged, and the purpose of decoupling the output power and the DC bus voltage is achieved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
FIG. 1 shows a flow diagram of a method of active power decoupling for an AC/DC converter circuit according to an exemplary embodiment of the present disclosure;
FIG. 2 illustrates a power decoupling control block diagram of an AC/DC converter circuit according to an exemplary embodiment of the present disclosure;
FIG. 3 shows a flow diagram of an active power decoupling method of an AC/DC converter circuit according to an exemplary embodiment of the present disclosure;
fig. 4 illustrates a main circuit topology of an AC/DC converter circuit according to an exemplary embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other methods, components, materials, devices, steps, and so forth. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in the form of software, or in one or more software-hardened modules, or in different networks and/or processor devices and/or microcontroller devices.
In the present exemplary embodiment, first, an active power decoupling method of an AC/DC converter circuit is provided; referring to fig. 1, the active power decoupling method of the AC/DC converter circuit may include the steps of:
step S110, sampling the output voltage of the AC/DC converter circuit, generating a sampling voltage, and comparing the sampling voltage with a preset reference value;
step S120, when the sampling voltage is smaller than the reference value, alternately conducting a third switch tube and a fourth switch tube of the AC/DC converter circuit to enable a first bus capacitor and a second bus capacitor of the AC/DC converter circuit to output power to a load;
and step S130, when the sampling voltage is greater than the reference value, simultaneously conducting a third switch tube and a fourth switch tube of the AC/DC converter circuit, enabling a first bus capacitor and a second bus capacitor of the AC/DC converter circuit to output power to a leakage inductor of a transformer, enabling the DC/DC converter circuit to output power to a load as preset power, and achieving decoupling between the output power and the bus voltage.
A method of active power decoupling for an AC/DC converter circuit in an exemplary embodiment of the present disclosure, the method comprising: sampling the output voltage of the AC/DC converter circuit, and comparing the generated sampling voltage with a preset reference value; and when the sampling voltage is greater than the reference value, the third switching tube and the fourth switching tube are simultaneously conducted, so that the first bus capacitor and the second bus capacitor of the AC/DC converter circuit output power to the leakage inductance of the transformer, and decoupling between the output power and the bus voltage is realized. According to the single-phase AC/DC converter circuit based on the power convergence control, active power decoupling between output power and bus voltage can be achieved through simple control, the capacitance capacity is reduced, the output instantaneous power of the converter is averaged, and the purpose of decoupling the output power and the DC bus voltage is achieved.
Next, a further description will be made of an active power decoupling method of the AC/DC converter circuit in the present exemplary embodiment.
In step S110, the AC/DC converter circuit output voltage may be sampled, a sampled voltage may be generated, and the sampled voltage may be compared with a preset reference value.
In step S120, when the sampled voltage is smaller than the reference value, the third switch tube and the fourth switch tube of the AC/DC converter circuit may be alternately turned on, so that the first bus capacitor and the second bus capacitor of the AC/DC converter circuit output power to the load.
In step S130, when the sampled voltage is greater than the reference value, the third switch tube and the fourth switch tube of the AC/DC converter circuit are turned on at the same time, so that the first bus capacitor and the second bus capacitor of the AC/DC converter circuit output power to the leakage inductance of the transformer, and the DC/DC converter circuit outputs power to the load at a preset power, thereby decoupling the output power from the bus voltage.
In the embodiment of the present example, when the sampling voltage is smaller than the reference value, the third switching tube and the fourth switching tube are alternately turned on according to the current direction of the output end of the third filter inductor, so that the first bus capacitor and the second bus capacitor output power to the load.
In an embodiment of the present example, the method further comprises: the first switch tube and the second switch tube are conducted complementarily at a duty ratio of 0.5, so that the circuit works in a Discontinuous Conduction Mode (DCM).
In an embodiment of the present example, the method further comprises:
the input power of the PFC stage circuit is adjusted by controlling the switching frequency of the first switching tube and the second switching tube, so that the average value of the direct current bus capacitor voltage in a double frequency period is kept constant.
In the embodiment of the present example, in the quasi-single-stage AC/DC converter circuit topology shown in fig. 1, the front stage totem-pole PFC circuit and the rear stage DC/DC converter circuit pass through the multiplexing switching tube (Q)1、Q2) And intermediate bus capacitance (C)1、C2) And (4) forming. To realizeInput power factor correction, switching tube Q1、Q2The complementary conduction with the duty ratio of 0.5 makes the circuit work in Discontinuous Conduction Mode (DCM). By controlling Q1、Q2The switching frequency of the PFC stage circuit is adjusted, so that the average value of the voltage of the direct current bus capacitor in a frequency doubling period is kept constant. If the switch tube Q3And Q4Is always in a synchronous rectification state, the middle direct current bus capacitor (C)1、C2) The voltage and output voltage fluctuate with input power if C1、C2If the capacity is small, the power decoupling cannot be realized, and the output voltage contains a large amount of double-frequency ripples.
In the embodiment of the example, the technology rectifies the switching tube Q by controlling the secondary side of the transformer3And Q4The active real-time control of the output power of the converter is realized by the on-off of the DC/AC converter, and the decoupling of the output power and the DC bus voltage is further realized. By comparing the output voltage with the reference value, when the output voltage is higher than the reference value, the converter works in a decoupling state, and at the moment, the two secondary side switching tubes Q3And Q4And conducting at the same time, so that the output instantaneous power of the AC/DC converter is the preset power, and if the preset power is set to be 0, the average output power of the converter is constant. The essence of this process is to block power output from the intermediate bus capacitor to the load, when energy is transferred from C1Or C2Transferred to the transformer leakage inductance and then flows back to the transformer C2Or C1And the energy flowing in from the front-stage PFC circuit is stored in the direct-current bus capacitor. By this method, C can be made1、C2When the double frequency voltage ripple changes greatly, the output power of the converter is kept approximately constant, and power decoupling is realized.
In the embodiment of the present example, the active power decoupling method described above can be implemented by the following hysteresis control strategy. As shown in fig. 2, for the output voltage voSampling to obtain a voltage voAnd a reference voltage Vo_refMaking a comparison when voBelow Vo_refWhen the converter is in the synchronous rectification state, the secondary side of the converter works. The controller is based on the switching tube Q3And Q4Body diodeThe conduction state of the tube is enabled to be alternatively switched on, and at the moment, the direct current bus capacitor C1、C2Outputting power to a load; when v isoHigher than Vo_refWhen is, Q3And Q4And when the AC/DC converter is switched on, the instantaneous power output by the AC/DC converter is 0, so that the average output power of the DC/DC level circuit in a double power frequency period is constant, and the decoupling between the output power and the DC bus voltage is realized. This control strategy can be implemented by a DSP controller, the software flow of which is shown in fig. 3.
In the embodiment of the example, the secondary side rectifier switching tube of the transformer is controlled to short-circuit the secondary side winding of the transformer, so that the output instantaneous power of the converter is averaged, and the aim of decoupling the output power and the voltage of the direct-current bus is fulfilled.
It should be noted that although the various steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that these steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
Further, in the present exemplary embodiment, an AC/DC converter circuit is also provided. Referring to fig. 4, the AC/DC converter circuit includes an electromagnetic interference (EMI) filter circuit, a totem-pole Power Factor Correction (PFC) circuit, and a DC/DC converter circuit. Wherein:
the EMI filter circuit comprises a first filter inductor and a first filter capacitor, wherein the first filter inductor is connected with one end of an input voltage source in series and then is connected with one end of the first filter capacitor, and the other end of the first filter capacitor is connected with the other end of the input voltage source;
the totem pole PFC circuit comprises a second filter inductor, a first switch tube, a second switch tube, a first diode, a second diode, a first bus capacitor and a second bus capacitor, wherein one end of the second filter inductor is connected with the connection point of the first filter inductor and the first filter capacitor of the EMI filter circuit, the other end of the second filter inductor is connected with the midpoint of the first switch tube and the second switch tube after being connected in series, the two ends of the first switch tube and the second switch tube after being connected in series are respectively connected with the two ends of the first diode and the second diode after being connected in series, and the two ends of the first bus capacitor after being connected in series with the second bus capacitor are connected in parallel, the midpoint of the first diode and the second diode after being connected in series is connected with the connection point of the other end of the first filter capacitor of the EMI filter circuit and the other end of the input voltage source;
the DC/DC conversion circuit comprises a first switch tube, a second switch tube, a first diode, a second diode, a first bus capacitor, a second bus capacitor, a transformer, a third filter inductor, a third switch tube, a fourth switch tube, a third diode, a fourth diode and a third bus capacitor, wherein the first switch tube, the second switch tube, the first diode, the second diode, the first bus capacitor and the second bus capacitor are multiplexed with the totem-pole PFC circuit, one end of the primary side of the transformer is connected with the midpoint of the totem-pole PFC circuit after the first switch tube and the second switch tube are connected in series, the other end of the primary side of the transformer is connected with the midpoint of the totem-pole PFC circuit after the first bus capacitor and the second bus capacitor are connected in series, one end of the secondary side of the transformer is connected with one end of the third inductor in series, the other end of the third inductor is connected with the midpoint of the third diode and the third switch tube in series, the other end of the secondary side of the transformer is connected with the middle point of the fourth diode after being connected with the fourth switch tube in series, and the two ends of the third diode after being connected with the third switch tube in series are respectively connected with the two ends of the fourth diode after being connected with the fourth switch tube in series and the third bus capacitor in parallel.
In an embodiment of the present example, the EMI filter circuit includes a first filter inductor and a first filter capacitor, where the first filter inductor is connected in series with one end of an input voltage source and then connected to one end of the first filter capacitor, and the other end of the first filter capacitor is connected to the other end of the input voltage source.
In the exemplary embodiment, the totem-pole PFC circuit includes a second filter inductor, a first switch tube, a second switch tube, a first diode, a second diode, a first bus capacitor and a second bus capacitor, wherein one end of the second filter inductor is connected with the connection point of the first filter inductor and the first filter capacitor of the EMI filter circuit, the other end of the second filter inductor is connected with the midpoint of the first switch tube and the second switch tube after being connected in series, the two ends of the first switch tube and the second switch tube after being connected in series are respectively connected with the two ends of the first diode and the second diode after being connected in series, and the two ends of the first bus capacitor after being connected in series with the second bus capacitor are connected in parallel, and the midpoint of the first diode and the second diode after being connected in series is connected with the connection point of the other end of the first filter capacitor of the EMI filter circuit and the other end of the input voltage source.
In the embodiment of the present example, the first bus capacitor and the second bus capacitor may be non-electrolytic capacitors.
In the embodiment of the present example, the conducting direction of the first diode is from the middle point of the first diode and the second diode after being connected in series to the parallel connection point;
the conducting direction of the second diode is from the parallel connection point of the first diode and the second diode after being connected in series to the direction of the series midpoint of the first diode and the second diode.
The DC/DC conversion circuit comprises a first switch tube, a second switch tube, a first diode, a second diode, a first bus capacitor, a second bus capacitor, a transformer, a third filter inductor, a third switch tube, a fourth switch tube, a third diode, a fourth diode and a third bus capacitor, wherein the first switch tube, the second switch tube, the first diode, the second diode, the first bus capacitor and the second bus capacitor are multiplexed with the totem-pole PFC circuit, one end of the primary side of the transformer is connected with the midpoint of the totem-pole PFC circuit after the first switch tube and the second switch tube are connected in series, the other end of the primary side of the transformer is connected with the midpoint of the totem-pole PFC circuit after the first bus capacitor and the second bus capacitor are connected in series, one end of the secondary side of the transformer is connected with one end of the third inductor in series, the other end of the third inductor is connected with the midpoint of the third diode and the third switch tube in series, the other end of the secondary side of the transformer is connected with the middle point of the fourth diode after being connected with the fourth switch tube in series, and the two ends of the third diode after being connected with the third switch tube in series are respectively connected with the two ends of the fourth diode after being connected with the fourth switch tube in series and the third bus capacitor in parallel.
In the embodiment of the present example, the conducting direction of the third diode is from the middle point of the third diode and the third switching tube after being connected in series to the parallel connection point;
and the conduction direction of the fourth diode is from the middle point of the fourth switch tube after being connected in series with the fourth switch tube to the parallel connection point.
In an embodiment of the present example, the single-phase AC/DC converter circuit further includes:
a load connected in parallel with a third bus capacitance of the DC/DC conversion circuit.
In the embodiment of the example, the single-phase AC/DC converter circuit based on the power bus control is composed of a front-stage totem pole PFC circuit and a rear-stage DC/DC conversion circuit through a multiplexing switch tube and an intermediate bus capacitor. The original quasi-single-stage AC/DC converter circuit adopts phase-shift control to realize power factor correction, and a capacitor C thereof1、C2Or CoThe output voltage needs to be large enough to be constant, namely, the passive power decoupling is realized. Compared with the original quasi-single-stage AC/DC converter circuit topology, the invention only needs to pass through the synchronous rectification switch tube Q of the secondary side of the transformer in the control circuit3And Q4And power decoupling can be realized without adding extra devices. Make two MOS tubes Q3And Q4And meanwhile, the power flowing to the load by the DC/DC converter can be blocked by conducting. Finally, even at C1、C2Under the condition of large voltage fluctuation, Q is controlled3And Q4The average value of the output power of the DC/DC converter in one switching period can be kept constant, and active power decoupling is realized.
The specific details of the active power decoupling module of each AC/DC converter circuit are already described in detail in the corresponding active power decoupling method of the AC/DC converter circuit, and therefore are not described herein again.
It should be noted that although in the above detailed description several modules or units of the active power decoupling arrangement of the AC/DC converter circuit are mentioned, this division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Furthermore, the above-described figures are merely schematic illustrations of processes involved in methods according to exemplary embodiments of the invention, and are not intended to be limiting. It will be readily understood that the processes shown in the above figures are not intended to indicate or limit the chronological order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the terms of the appended claims.

Claims (8)

1. An active power decoupling method of an AC/DC converter circuit is characterized in that the AC/DC converter circuit is composed of a front-stage totem pole Power Factor Correction (PFC) circuit and a rear-stage DC/DC converter circuit by multiplexing a first switching tube, a second switching tube, a first bus capacitor and a second bus capacitor, the DC/DC converter circuit further comprises a third switching tube and a fourth switching tube, and the method comprises the following steps:
sampling the output voltage of the AC/DC converter circuit to generate a sampling voltage, and comparing the sampling voltage with a preset reference value;
when the sampling voltage is smaller than the reference value, alternately conducting a third switch tube and a fourth switch tube of the AC/DC converter circuit to enable a first bus capacitor and a second bus capacitor of the AC/DC converter circuit to output power to a load;
and when the sampling voltage is greater than the reference value, simultaneously conducting a third switch tube and a fourth switch tube of the AC/DC converter circuit, enabling a first bus capacitor and a second bus capacitor of the AC/DC converter circuit to output power to a leakage inductance of a transformer, enabling the DC/DC converter circuit to output power to a load as preset power, and achieving decoupling between the output power and the bus voltage.
2. The method of claim 1, wherein the method further comprises:
and when the sampling voltage is smaller than the reference value, alternately conducting a third switch tube and a fourth switch tube of the AC/DC converter circuit according to the current direction of the output end of the third filter inductor, so that the first bus capacitor and the second bus capacitor of the AC/DC converter circuit output power to a load.
3. The method of claim 1, wherein the method further comprises:
the first switch tube and the second switch tube are complementarily conducted at a duty ratio of 0.5, so that the circuit works in a discontinuous conduction mode DCM.
4. The method of claim 1, wherein the method further comprises:
and the input power of the PFC stage circuit is adjusted by controlling the switching frequency of the first switching tube and the second switching tube, so that the average value of the DC bus capacitor voltage in a double frequency period is kept constant.
5. The method of claim 1, wherein the AC/DC converter circuit further comprises an electromagnetic interference (EMI) filter circuit, wherein:
the EMI filter circuit comprises a first filter inductor and a first filter capacitor, wherein the first filter inductor is connected with one end of an input voltage source in series and then is connected with one end of the first filter capacitor, and the other end of the first filter capacitor is connected with the other end of the input voltage source;
the PFC circuit further includes: the EMI filter circuit comprises a first filter inductor, a first diode and a second diode, wherein one end of the first filter inductor is connected with a connection point of a first filter inductor and a first filter capacitor of the EMI filter circuit, the other end of the first filter inductor is connected with a midpoint of a first switch tube and a second switch tube which are connected in series, two ends of the first switch tube and the second switch tube which are connected in series are respectively connected with two ends of the first diode and the second diode which are connected in series and two ends of a first bus capacitor and a second bus capacitor which are connected in series in parallel, and the midpoint of the first diode and the second diode which are connected in series is connected with a connection point of the other end of the first filter capacitor of the EMI filter circuit and the other end of the input voltage source;
the DC/DC conversion circuit further comprises a first switch tube, a second switch tube, a first diode, a second diode, a first bus capacitor and a second bus capacitor which are multiplexed with the PFC circuit; and a transformer, a third filter inductor, a third diode, a fourth diode, a third bus capacitor, wherein, one end of the primary side of the transformer is connected with the midpoint of the totem pole PFC circuit after the first switch tube and the second switch tube are connected in series, the other end of the primary side of the transformer is connected with the midpoint of the totem pole PFC circuit after the first bus capacitor and the second bus capacitor are connected in series, one end of the secondary side of the transformer is connected with one end of the third inductor in series, the other end of the third inductor is connected with the middle point of the third diode and the third switching tube after being connected in series, the other end of the secondary side of the transformer is connected with the midpoint of the fourth diode and the fourth switching tube after being connected in series, and two ends of the third diode and the third switching tube after being connected in series are respectively connected in parallel with two ends of the fourth diode and the fourth switching tube after being connected in series and the third bus capacitor.
6. The method of claim 5, wherein the single-phase AC/DC converter circuit further comprises:
a load connected in parallel with a third bus capacitance of the DC/DC conversion circuit.
7. The method of claim 5, wherein the conducting direction of the first diode is from the middle point of the first diode and the second diode after being connected in series to the parallel connection point;
the conduction direction of the second diode is from the parallel connection point of the first diode and the second diode after being connected in series to the direction of the series midpoint of the first diode and the second diode;
the conducting direction of the third diode is from the middle point of the third diode and the third switching tube after being connected in series to the direction of the parallel connection point;
and the conduction direction of the fourth diode is from the middle point of the fourth switch tube after being connected in series with the fourth switch tube to the parallel connection point.
8. The method of claim 5, wherein the first bus capacitor and the second bus capacitor are selected from non-electrolytic capacitors.
CN202111320412.XA 2021-11-09 2021-11-09 Active power decoupling method of AC/DC converter circuit Pending CN114123821A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111987913A (en) * 2020-07-24 2020-11-24 北京航空航天大学 Quasi-single-stage AC/DC converter circuit capable of realizing active power decoupling

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111987913A (en) * 2020-07-24 2020-11-24 北京航空航天大学 Quasi-single-stage AC/DC converter circuit capable of realizing active power decoupling

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ZHENNAN WANG: "Electrolytic Capacitor-less Quasi-Single-Stage AC/DC Converter With Controllable Rectifier Circuits", 《2020 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)》, pages 4602 - 4606 *

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