CN111987913B - Quasi-single-stage AC/DC converter circuit capable of realizing active power decoupling - Google Patents

Quasi-single-stage AC/DC converter circuit capable of realizing active power decoupling Download PDF

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CN111987913B
CN111987913B CN202010725114.8A CN202010725114A CN111987913B CN 111987913 B CN111987913 B CN 111987913B CN 202010725114 A CN202010725114 A CN 202010725114A CN 111987913 B CN111987913 B CN 111987913B
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circuit
switch tube
diode
totem
bridge
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CN111987913A (en
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单振宇
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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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The present disclosure relates to a quasi-single-stage AC/DC converter circuit capable of active power decoupling, the AC/DC converter circuit comprising: the active power decoupling device comprises an input circuit, a totem-pole PFC circuit, a half-bridge DC/DC conversion circuit and an output load, wherein active power decoupling of the AC/DC converter circuit can be achieved by controlling a third switching tube and a fourth switching tube of the half-bridge DC/DC conversion circuit. According to the active power decoupling method, the active power decoupling of the AC/DC converter can be realized without additional passive devices and complex auxiliary circuit control strategies, a large-capacity capacitor is not needed, and the reliability and stability of the system are greatly improved.

Description

Quasi-single-stage AC/DC converter circuit capable of realizing active power decoupling
Technical Field
The disclosure relates to the field of power electronics, in particular to a quasi-single-stage AC/DC converter circuit capable of achieving active power decoupling.
Background
The AC/DC converter realizes the electric energy conversion from alternating current commercial power to low-voltage direct current, and is an important component of a rectification power supply. The input power is the pulsating power containing double power frequency fluctuation, and the output power is the constant direct current power, so the decoupling between the input power and the output power, namely the power decoupling, needs to be realized in the AC/DC converter. In a traditional AC/DC converter, a large-capacity capacitor is directly connected to an output end, and power decoupling, namely passive power decoupling, is directly realized through capacitive energy storage. Since the required energy storage capacity is usually very large, electrolytic capacitors are used. However, electrolytic capacitors have the disadvantages of low lifetime and poor reliability, and thus have limited application in many power sources.
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 a quasi-single stage AC/DC converter circuit that may achieve active power decoupling, 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 one aspect of the present disclosure, there is provided a quasi-single-stage AC/DC converter circuit capable of active power decoupling, comprising:
the input circuit is used for supplying power to the AC/DC converter circuit and comprises a live wire and a zero wire;
the totem-pole PFC circuit is connected with the input circuit, comprises a first inductor, a first diode, a second diode, a first switch tube and a second switch tube, and is used for converting alternating current of the input circuit into direct current when the first switch tube and the second switch tube are complementarily switched on;
the half-bridge DC/DC conversion circuit is connected with the totem-pole PFC circuit, comprises a first switch tube and a second switch tube which are shared with the totem-pole PFC circuit, and a first capacitor, a second capacitor, a transformer, a third diode, a fourth diode, a third switch tube, a fourth switch tube and a third capacitor, and is used for controlling the third switch tube and the fourth switch tube to keep the average value of the output power of the direct current output by the totem-pole PFC circuit in one switching period constant and realize the input and output power decoupling of the totem-pole PFC circuit;
the output load is connected with the half-bridge DC/DC conversion circuit and used for realizing the control of a third switching tube and a fourth switching tube of the half-bridge DC/DC conversion circuit through the sampling of the voltage of the output load;
one end of the input circuit is connected with a first inductor of the totem-pole PFC circuit, and the other end of the input circuit is connected with the middle points of a first diode and a second diode of the totem-pole PFC circuit;
in an exemplary embodiment of the present disclosure, one end of a first inductor of the totem-pole PFC circuit is connected to a midpoint of a first switching tube and a midpoint of a second switching tube, a first diode is connected in series with the second diode, and the first switching tube is connected in parallel after being connected in series with the second switching tube.
In an exemplary embodiment of the disclosure, a first switching tube of the half-bridge DC/DC conversion circuit is connected in series with a second switching tube, a first capacitor is connected in series with the second capacitor and then connected in parallel with a first diode and a second diode of the totem-pole PFC circuit, one end of a primary side of the transformer is connected to a midpoint of the first switching tube and the second switching tube, one end of the primary side of the transformer is connected to a midpoint of the first capacitor and the second capacitor, one end of a secondary side of the transformer is connected to a third diode, one end of the secondary side of the transformer is connected to a fourth diode, one end of the third diode is connected to a third switching tube, one end of the fourth diode is connected to a fourth switching tube, and the third switching tube and the fourth switching tube are respectively connected to the third capacitor.
In an exemplary embodiment of the present disclosure, the output load is connected in parallel with a third capacitor of the half-bridge DC/DC conversion circuit.
In an exemplary embodiment of the disclosure, the first and second switching tubes of the totem-pole PFC circuit may be complementarily turned on at a duty ratio of 0.5, so as to convert the ac power of the input circuit into dc power.
In an exemplary embodiment of the present disclosure, the half-bridge DC/DC conversion circuit further includes a second inductor and a third inductor, which are used to make the half-bridge DC/DC conversion circuit achieve stable power output, one end of the second inductor is connected to the midpoint of the first switching tube and the second switching tube, and the other end is connected to the primary side of the transformer; and the third inductor is connected with the primary side of the transformer in parallel.
In an exemplary embodiment of the present disclosure, the AC/DC converter circuit further includes:
and the control circuit is used for receiving the output voltage of the sampled output load, comparing the output voltage with a preset output voltage reference value, generating a control signal, and controlling a third switch tube and a fourth switch tube of the half-bridge DC/DC conversion circuit through the control signal to realize active power decoupling of the AC/DC converter circuit.
In an exemplary embodiment of the present disclosure, a quasi-single stage AC/DC converter circuit capable of active power decoupling includes: the active power decoupling device comprises an input circuit, a totem-pole PFC circuit, a half-bridge DC/DC conversion circuit and an output load, wherein active power decoupling of the AC/DC converter circuit can be achieved by controlling a third switching tube and a fourth switching tube of the half-bridge DC/DC conversion circuit. According to the active power decoupling method, the active power decoupling of the AC/DC converter can be realized without additional passive devices and complex auxiliary circuit control strategies, a large-capacity capacitor is not needed, and the reliability and stability of the system are greatly improved.
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 illustrates a circuit topology of a quasi-single stage AC/DC converter circuit that can implement active power decoupling according to an exemplary embodiment of the present disclosure;
FIG. 2 illustrates a control block diagram of a quasi-single stage AC/DC converter circuit that can implement active power decoupling according to an exemplary embodiment of the present disclosure;
FIG. 3 illustrates a control flow diagram of a quasi-single stage AC/DC converter circuit that can implement active power decoupling according to an exemplary embodiment of the present disclosure;
fig. 4A-4D show experimental waveform diagrams of a quasi-single stage AC/DC converter circuit that can achieve active power decoupling 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, a quasi-single-stage AC/DC converter circuit that can achieve active power decoupling is first provided; referring to fig. 1, the circuit may include the following modules:
input circuit 110, totem-pole PFC circuit 120, half-bridge DC/DC conversion circuit 130, and output load 140:
the input circuit 110 is used for supplying power to the AC/DC converter circuit, and includes a live wire and a zero wire;
the totem-pole PFC circuit, connected to the input circuit 110, includes a first inductor LgA first diode D1A second diode D2A first switch tube Q1And a second switching tube Q2For the first switching tube Q1And a second switch tube Q2When the complementary is on, the alternating current of the input circuit 110 is converted into direct current;
the half-bridge DC/DC conversion circuit 130 is connected to the totem-pole PFC circuit, and includes a first switching tube Q shared with the totem-pole PFC circuit1A second switch tube Q2A first capacitor C1A second capacitor C2Transformer, third diode D3A fourth diode D4And a third switching tube Q3And a fourth switching tube Q4And a third capacitor C0For controlling the third switching tube Q3And a fourth switching tube Q4The average value of the output power of the direct current output by the totem-pole PFC circuit in a switching period is kept constant, so that the purpose of controlling the output power of the totem-pole PFC circuit is achievedThe input and output power of the totem-pole PFC circuit is decoupled;
the output load is connected with the half-bridge DC/DC conversion circuit 130 and is used for sampling the voltage of the output load to realize the third switching tube Q of the half-bridge DC/DC conversion circuit 1303And a fourth switching tube Q4Control of (2);
one end of the input circuit 110 and the first inductor L of the totem-pole PFC circuitgOne end of the first diode D is connected with the first diode D of the totem-pole PFC circuit1A second diode D2Are connected with each other;
first inductor L of totem-pole PFC circuitgOne end of the first switch tube Q1A second switch tube Q2Are connected to a first diode D1And a second diode D2Series first switch tube Q1And a second switch tube Q2Are connected in parallel after being connected in series;
first switch tube Q of half-bridge DC/DC conversion circuit 1301And a second switch tube Q2Series, first capacitor C1And a second capacitor C2A first diode D connected in series with the totem-pole PFC circuit1And a second diode D2After being connected in series, the transformer is connected in parallel, and one end of the primary side of the transformer is connected with the first switching tube Q1And a second switch tube Q2Is connected to the first capacitor C at one end1And a second capacitor C2Is connected with the middle point of the transformer, one end of the secondary side of the transformer is connected with a third diode D3One end of the diode D is connected with the fourth diode D4Connected to the third diode D3One end of the third switch tube Q3Connected, the fourth diode D4One end of the fourth switch tube Q4Connected, the third switching tube Q3And a fourth switching tube Q4Respectively connected with a third capacitor C0Connecting;
the output load and the third capacitor C of the half-bridge DC/DC conversion circuit 1300And (4) connecting in parallel.
Quasi-single stage AC/DC conversion with active power decoupling achievable in exemplary embodiments of the present disclosureAn AC/DC converter circuit, the AC/DC converter circuit comprising: an input circuit 110, a totem-pole PFC circuit 120, a half-bridge DC/DC conversion circuit 130 and an output load, wherein the output load is controlled by controlling a third switching tube Q of the half-bridge DC/DC conversion circuit 1303And a fourth switching tube Q4Active power decoupling of the AC/DC converter circuit may be achieved. According to the active power decoupling method, the active power decoupling of the AC/DC converter can be realized without additional passive devices and complex auxiliary circuit control strategies, a large-capacity capacitor is not needed, and the reliability and stability of the system are greatly improved.
In the following, a further description will be given of a quasi-single-stage AC/DC converter circuit in the present exemplary embodiment, which can achieve active power decoupling.
Fig. 1 shows a main circuit topology diagram of a quasi-single-stage type AC/DC converter without a large-capacity electrolytic capacitor.
The input circuit 110 is used for supplying power to the AC/DC converter circuit, and includes a live wire and a zero wire;
the totem-pole PFC circuit, connected to the input circuit 110, includes a first inductor LgA first diode D1A second diode D2A first switch tube Q1And a second switching tube Q2For the first switching tube Q1And a second switch tube Q2When the complementary is on, the alternating current of the input circuit 110 is converted into direct current;
the half-bridge DC/DC conversion circuit 130 is connected to the totem-pole PFC circuit, and includes a first switching tube Q shared with the totem-pole PFC circuit1A second switch tube Q2A first capacitor C1A second capacitor C2Transformer, third diode D3A fourth diode D4And a third switching tube Q3And a fourth switching tube Q4And a third capacitor C0For controlling the third switching tube Q3And a fourth switching tube Q4The average value of the output power of the direct current output by the totem-pole PFC circuit in a switching period is kept constant, so that the input and output power solution of the totem-pole PFC circuit is realizedCoupling;
the output load is connected with the half-bridge DC/DC conversion circuit 130 and is used for sampling the voltage of the output load to realize the third switching tube Q of the half-bridge DC/DC conversion circuit 1303And a fourth switching tube Q4Control of (2);
one end of the input circuit 110 and the first inductor L of the totem-pole PFC circuitgOne end of the first diode D is connected with the first diode D of the totem-pole PFC circuit1A second diode D2Are connected with each other;
first inductor L of totem-pole PFC circuitgOne end of the first switch tube Q1A second switch tube Q2Are connected to a first diode D1And a second diode D2Series first switch tube Q1And a second switch tube Q2Are connected in parallel after being connected in series;
first switch tube Q of half-bridge DC/DC conversion circuit 1301And a second switch tube Q2Series, first capacitor C1And a second capacitor C2A first diode D connected in series with the totem-pole PFC circuit1And a second diode D2After being connected in series, the transformer is connected in parallel, and one end of the primary side of the transformer is connected with the first switching tube Q1And a second switch tube Q2Is connected to the first capacitor C at one end1And a second capacitor C2Is connected with the middle point of the transformer, one end of the secondary side of the transformer is connected with a third diode D3One end of the diode D is connected with the fourth diode D4Connected to the third diode D3One end of the third switch tube Q3Connected, the fourth diode D4One end of the fourth switch tube Q4Connected, the third switching tube Q3And a fourth switching tube Q4Respectively connected with a third capacitor C0Connecting;
the output load and the third capacitor C of the half-bridge DC/DC conversion circuit 1300And (4) connecting in parallel.
In the embodiment of the example, the active power of the quasi-single-stage AC/DC converter is realized by serially connecting the switching tubes in the high-frequency half-wave rectification circuitA method of rate decoupling. In the quasi-single-stage AC/DC converter shown in fig. 1, the secondary side of the transformer of the half-bridge DC/DC converter circuit outputs DC power to the load through a half-wave rectifier circuit. In the original quasi-single-stage AC/DC converter circuit, the half-wave rectification circuit only consists of a diode D3And D4The current flowing to the load is formed by a capacitor C1，C2And CoThe voltage on the capacitor. If the output power does not contain double power frequency fluctuation, the capacitor C1，C2Or CoThe voltage of the power supply is required to be large enough to be constant, namely, the passive power decoupling is realized. As shown in FIG. 1, two switching tubes Q are connected in series in a half-wave rectifier circuit3And Q4A controllable rectifier circuit is formed. Make two MOS tubes Q3And Q4And the current flowing to the load by the DC/DC converter can be blocked when the power supply is switched off. 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.
In the embodiment of the example, the decoupling of the voltage and the output power of the intermediate energy storage capacitor is realized by adding two switching tubes to the original circuit topology to construct a controllable rectifying circuit. The capacity of the intermediate energy storage capacitor and the filter capacitor of the AC/DC converter can be greatly reduced without adding additional passive devices, and the rectification power supply without electrolytic capacitors is realized.
In the embodiment of the present example, the first switch Q of the totem-type PFC circuit1A second switch tube Q2The ac power of the input circuit 110 can be converted to dc power with a duty cycle of 0.5.
The half-bridge DC/DC conversion circuit 130 further includes a second inductor LsA third inductor LmFor enabling the half-bridge DC/DC conversion circuit 130 to achieve stable power output, the second inductor LsOne end of the first switch tube Q1A second switch tube Q2One end of the transformer is connected with the primary side of the transformer; the third inductor LmIs connected with the primary side of the transformer in parallel.
In the embodiment of the example, the quasi-single-stage AC/DC converter circuit is formed by multiplexing a totem-pole PFC circuit and a half-bridge DC/DC conversion circuit into a switching tube Q1And Q2And (4) forming. When the switch tube is complementarily switched on at a duty ratio of 0.5, the PFC circuit can be enabled to operate in an intermittent conduction mode to charge the energy storage capacitor. And meanwhile, the DC/DC conversion circuit is enabled to work, and the voltage of the intermediate energy storage capacitor is converted into the required output voltage. If there is no switching tube Q3And Q4The DC/DC conversion voltage transformation ratio is fixed, and the output voltage follows the middle energy storage capacitor C1And C2Voltage fluctuation of C1And C2When the capacity is small, the power decoupling can not be realized, and the output voltage contains double power frequency ripples.
Adding switch tube Q in AC/DC converter circuit3And Q4The output current of the DC/DC conversion circuit passes through a changeover switch Q3And Q4To control. When Q is3And Q4When the transformer is switched on, the rectifying circuit can transmit the primary side electric energy of the transformer to a load. When Q is3And Q4When the transformer is turned off, the secondary winding of the transformer is opened, and the output power of the converter to the load is zero. By this method, C can be made1And C2When the ripple variation of the double frequency voltage is large, the output power of the converter is in Q3And Q4The average value in one switching period of the power amplifier is kept constant, and power decoupling is achieved.
In an embodiment of the present example, the AC/DC converter circuit further includes: a control circuit for receiving the output voltage of the sampled output load, comparing the output voltage with a preset output voltage reference value, generating a control signal, and controlling the third switching tube Q of the half-bridge DC/DC conversion circuit 130 by the control signal3And a fourth switching tube Q4And active power decoupling of the AC/DC conversion circuit is realized.
As shown in fig. 2, for the output voltage VoSampling and setting a reference value V with the output voltagerefA comparison is made. If VoBelow VrefThen switch Q4Follow switch Q1Are turned on together, Q3With Q2Is turned on so thatThe average current flowing through the two windings and the rectifying circuit is equal. This control strategy can also be implemented by a DSP controller, the software flow of which is shown in fig. 3.
Fig. 4A to 4D are experimental results of the AC/DC converter based on the present disclosure, where fig. 4A is an experimental waveform diagram when the power decoupling function of the controllable rectifier circuit is turned off, fig. 4B is an experimental waveform diagram when the power decoupling function of the controllable rectifier circuit is turned on, fig. 4C is a waveform diagram of voltage and current inside the AC/DC converter, and fig. 4D is a waveform diagram of voltage and current in a single switching cycle. As can be seen in FIGS. 4A-4D, with active power decoupling disabled (Q)3And Q4Remain on) as shown in fig. 4A, there is a significant double frequency ripple on the output voltage. Fig. 4B shows the AC/DC converter operating waveforms for enabling active power decoupling. In this case, the output voltage VoThe ripple wave on the capacitor is obviously reduced, and the double frequency ripple power is stored by the energy storage capacitor C1And C2And (4) completely absorbing.
In the embodiment of the example, the decoupling of the voltage and the output power of the intermediate energy storage capacitor is realized by adding two switching tubes to the original circuit topology to construct the controllable rectifying circuit. The capacity of the intermediate energy storage capacitor and the filter capacitor of the AC/DC converter can be greatly reduced without adding additional passive devices, and the rectification power supply without electrolytic capacitors is realized. The power decoupling can be realized only by adding two switching tubes in the existing quasi-single-stage AC/DC converter, so that the output voltage is kept constant under the condition of large-amplitude fluctuation of the voltage of the energy storage capacitor, and further, the power supply without electrolytic capacitor is realized.
It should be noted that although in the above detailed description several modules or units of a quasi-single stage AC/DC converter circuit arrangement are mentioned, where active power decoupling may be implemented, 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 (7)

1. A controllable rectification circuit capable of realizing active power decoupling of a quasi-single-stage AC/DC converter is characterized by comprising: input circuit, totem pole PFC circuit, half bridge type DC/DC converting circuit and output load:
the input circuit is used for supplying power to the controllable rectifying circuit and comprises a live wire and a zero line;
the totem-type PFC circuit is connected with the input circuit, comprises a first inductor, a first diode, a second diode, a first switch tube and a second switch tube, and is used for converting alternating current of the input circuit into direct current when the first switch tube and the second switch tube are complementarily switched on;
the half-bridge DC/DC conversion circuit is connected with the totem-type PFC circuit, comprises a first switch tube and a second switch tube which are shared with the totem-type PFC circuit, and a first capacitor, a second capacitor, a transformer, a third diode, a fourth diode, a third switch tube, a fourth switch tube and a third capacitor, and is used for controlling the third switch tube and the fourth switch tube to be turned off simultaneously so as to keep the average value of the output power of the direct current output by the totem-type PFC circuit constant in one switching period and realize active power decoupling of the direct current;
the output load is connected with the half-bridge DC/DC conversion circuit and used for realizing the control of a third switching tube and a fourth switching tube of the half-bridge DC/DC conversion circuit through the sampling of the voltage of the output load;
one end of the input circuit is connected with the first inductor of the totem-type PFC circuit, and the other end of the input circuit is connected with the middle points of the first diode and the second diode of the totem-type PFC circuit.
2. Controllable rectifier circuit according to claim 1,
one end of a first inductor of the totem-type PFC circuit is connected with the middle points of a first switch tube and a second switch tube, a first diode is connected with the second diode in series, and the first switch tube is connected with the second switch tube in parallel after being connected in series.
3. Controllable rectifier circuit according to claim 1,
the half-bridge DC/DC conversion circuit is characterized in that a first switch tube and a second switch tube of the half-bridge DC/DC conversion circuit are connected in series, a first capacitor and a second capacitor are connected in series and then connected in parallel with a first diode and a second diode of the totem-mode PFC circuit, one end of the primary side of the transformer is connected with the middle point of the first switch tube and the middle point of the second switch tube, one end of the secondary side of the transformer is connected with a third diode, one end of the secondary side of the transformer is connected with a fourth diode, one end of the third diode is connected with a third switch tube, one end of the fourth diode is connected with a fourth switch tube, and the third switch tube and the fourth switch tube are respectively connected with a third capacitor.
4. The controllable rectifier circuit of claim 1 wherein said output load is connected in parallel with a third capacitor of said half-bridge DC/DC converter circuit.
5. The controllable rectifier circuit according to claim 1, wherein the first switch tube and the second switch tube of the totem-type PFC circuit are complementarily turned on at a duty ratio of 0.5, so as to convert the ac power of the input circuit into dc power.
6. The controllable rectifying circuit according to claim 1, wherein said half-bridge DC/DC converting circuit further comprises a second inductor and a third inductor for stabilizing power output of said half-bridge DC/DC converting circuit, one end of said second inductor is connected to the middle points of said first switching tube and said second switching tube, and the other end is connected to the primary side of the transformer; and the third inductor is connected with the primary side of the transformer in parallel.
7. The controllable rectifier circuit of claim 1 further comprising:
and the control circuit is used for receiving the output voltage of the sampled output load, comparing the output voltage with a preset output voltage reference value to generate a control signal, and controlling a third switching tube and a fourth switching tube of the half-bridge DC/DC conversion circuit through the control signal to realize active power decoupling of the controllable rectification circuit.
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