CN116742971A - Power converter, power conversion circuit, and electronic device - Google Patents

Abstract

The invention discloses a power converter, a power conversion circuit and electronic equipment, wherein the power converter comprises an alternating current voltage source, an output capacitor and a load, and further comprises: a first ac-dc converter, a second ac-dc converter, a first dc-dc converter, and a second dc-dc converter; the first AC-DC converter and the first DC-DC converter work in a first half period of an AC voltage source to provide stable voltage or current for a load; the second ac-dc converter and the second dc-dc converter operate during a second half cycle of the ac voltage source to provide a regulated voltage or current to the load; the power converter, the power conversion circuit and the electronic equipment provided by the invention have high efficiency and do not need an input rectifier bridge.

Description

Power converter, power conversion circuit, and electronic device

Technical Field

The present invention relates to the field of power conversion technologies, and in particular, to a power converter, a power conversion circuit, and an electronic device.

Background

In the prior art, high-power application needs to have a power factor requirement, for example, from 8 months of 2016, according to the requirements of IEC61000-3-2 and other standards, power application with power higher than 75W needs to increase Power Factor Correction (PFC), and power lower than 75W does not have the requirement. The conventional two-stage power supply circuit realizes a power factor correction function and obtains a constant output electric signal, for example, a front-stage power supply circuit adopts a power factor correction circuit to output relatively stable direct current voltage; the post-stage power supply circuit adopts a direct current-direct current power supply circuit to realize constant and strobe-free output voltage or output current.

In the prior art, a two-stage power supply circuit needs a front-back two-stage power stage and a two-stage control circuit, which results in increased overall cost and reduced overall efficiency, and the power consumption of a diode rectifier bridge coupled with an alternating-current voltage source is a realistic problem in high-power application.

Disclosure of Invention

In a first aspect, the present invention provides a power converter comprising an ac voltage source, an output capacitor and a load, further comprising: the first alternating current-direct current converter receives a first end of the alternating current voltage source as an input voltage anode, a second end of the alternating current voltage source as an input voltage cathode and outputs a second direct current voltage; the second alternating current-direct current converter receives the second end of the alternating current voltage source as an input voltage anode, and the first end of the alternating current voltage source as an input voltage cathode to output a third direct current voltage; the first direct current-direct current converter receives the second direct current voltage as an input voltage; the second direct current-direct current converter receives the third direct current voltage as an input voltage; the first AC-DC converter and the first DC-DC converter work in a first half period of an AC voltage source to provide stable voltage or current for a load; the second ac-dc converter and the second dc-dc converter operate during a second half cycle of the ac voltage source to provide a regulated voltage or current to the load.

Preferably, the first ac-dc converter and the first dc-dc converter share a first power switch; the second ac-dc converter and the second dc-dc converter share a second power switch.

Preferably, the power converter includes a first energy storage element, a second energy storage element, a third energy storage element, a fourth energy storage element and a fifth energy storage element; the first energy storage element is an inductive element, the second energy storage element is an inductive element, the third energy storage element is a capacitive element, the fourth energy storage element is an inductive element, and the fifth energy storage element is a capacitive element.

In a second aspect, in a first half cycle of the alternating voltage source, in a first working state, the first path receives a voltage of the first half cycle of the alternating voltage source to store energy of the first energy storage element, and a first current flowing through the first energy storage element rises; a second path receives a second direct-current voltage, stores energy of the second energy storage element, and increases a second current flowing through the second energy storage element; in a second operating state, the first energy storage element releases energy to the third energy storage element through a third path to generate the second direct voltage on the third energy storage element, and the first current drops; the second energy storage element discharges energy to an output capacitor and a load through a fourth path, and the second current drops; in the second half period of the alternating current voltage source, in a third working state, the fifth path receives the voltage of the second half period of the alternating current voltage source to store energy of the fourth energy storage element, and the third current flowing through the fourth energy storage element rises; a sixth path receives a third direct-current voltage, stores energy of the second energy storage element, and increases a fourth current flowing through the second energy storage element; in a fourth operating state, the fourth energy storage element releasing energy to the fifth energy storage element through a seventh path to generate the third direct voltage on the fifth energy storage element, and the third current decreases; the second energy storage element discharges energy to an output capacitance and a load through an eighth path, and the fourth current drops.

Preferably, in a first working state of a first half cycle of the alternating-current voltage source, the first power switch is in an on state, the second power switch is in an off state, the third power switch is in an on state, and the fourth power switch is in an off state; when the first half-cycle second working state of the alternating-current voltage source is, the first power switch is in an off state, and the second power switch is in an off state; when the first power switch is in a first working state of a first half cycle of the alternating-current voltage source, the second power switch is in a second working state, the third power switch is in a second working state, and the fourth power switch is in a third working state; in a fourth operating state of the second half cycle of the alternating voltage source, the first power switch is in an off state and the second power switch is in an off state.

Preferably, the third power switch and the fourth power switch are partly or wholly diodes.

Preferably, the first detection resistor is located on a common path of the first path and the fifth path, and is used for detecting the current of the first path or the fifth path to generate a first detection signal; the second detection resistor is positioned on a common path of the second path and the sixth path and is used for detecting the current of the second path or the sixth path to generate a second detection signal; the power conversion circuit further comprises a control module, which is coupled with the first detection signal and the second detection signal and controls the first power switch or the second power switch to be turned on or turned off according to the detection signals.

Preferably, the power conversion circuit further comprises a control chip, and the control module, the first power switch, the second power switch, the third power switch and the fourth power switch are integrated.

Preferably, the first energy storage element, the third energy storage element, the first path and the third path form a first ac-dc converter; the fourth energy storage element, the fifth path and the seventh path form a second alternating current-direct current converter; the second energy storage element, the second path and the fourth path form a first direct current-direct current converter; the fifth energy storage element, the sixth path and the eighth path form a second direct current-direct current converter; the first alternating current-direct current converter and the second alternating current-direct current converter are both of a boost type topological structure, a flyback type topological structure or a boost type topological structure; the first DC-DC converter and the second DC-DC converter are both of a buck topology structure, a flyback topology structure or a buck-boost topology structure.

Preferably, the third energy storage element is connected in parallel with the fifth energy storage element, and the third energy storage element and the fifth energy storage element can be combined into one energy storage element; and/or the first power switch MP1 and the second power switch MP2 are connected in parallel, and the two may be combined into one power switch.

In a third aspect, the invention provides an electronic device comprising a power converter as claimed in any one of the first aspects or a power conversion circuit as claimed in any one of the second aspects.

The technology of the invention has the following advantages:

according to the power converter or the power conversion circuit, a rectifier bridge coupled with an alternating voltage source is omitted, the structure of a two-stage power supply circuit is simplified, and the efficiency of the power supply circuit is improved.

Drawings

FIGS. 1A-1D are schematic illustrations of 4 operational states of one embodiment of the present invention;

FIGS. 2A-2D are schematic illustrations of 4 operational states of one embodiment of the present invention;

FIGS. 3A-3D are schematic illustrations of 4 operational states of one embodiment of the present invention;

FIGS. 4A-4C are schematic illustrations of one embodiment of the present invention;

FIG. 5 is a block diagram of an embodiment of the present invention;

various features and elements are not drawn to scale in accordance with conventional practice in the drawings in order to best illustrate the specific features and elements associated with the invention. In addition, like elements/components are referred to by the same or similar reference numerals among the different drawings.

[ reference numerals description ]

11X (x=1-6): x-th control module

510: first AC-DC converter

520: second AC-DC converter

530: first DC-DC converter

540: second DC-DC converter

[ symbolic description ]

L1X (x=1-6): first energy storage element

L2X (x=1-6): second energy storage element

CM3X (x=1-6): third energy storage element

VM2X (x=1-6): second DC voltage

L4X (x=1-6): fourth energy storage element

CM5X (x=1-6): fifth energy storage element

VM3X (x=1-6): third DC voltage

P (1) -P (8): first path-eighth path

Ich1-Ich4 first current-fourth current

MP1-MP4: first power switch-fourth power switch

GP1-GP4: control signal

DXY (x=1-6, y=1-6): diode

RCSX (x=1-2): x-th detection resistor

VCSX (x=1-2): x-th detection signal

VAC: AC voltage source

VACX (x=1-2): x-th end

CO: output capacitor

VO: and outputting the voltage.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In a first aspect, the present invention provides a power converter.

A power converter as shown in fig. 5, comprising an ac voltage source VAC, an output capacitor CO and a load, further comprising: a first ac-dc converter 510 that receives a first end VAC1 of an ac voltage source VAC as an input voltage positive electrode, a second end VAC2 of the ac voltage source VAC as an input voltage negative electrode, and outputs a second dc voltage VM2X; a second ac-dc converter 520 receiving a second end VAC2 of the ac voltage source VAC as an input voltage anode, a first end VAC1 of the ac voltage source VAC as an input voltage cathode, and outputting a third dc voltage VM3X; the first dc-dc converter 530 receives the second dc voltage VM2X as an input voltage; the second dc-dc converter 540 receives the third dc voltage as the input voltage VM3X; the first ac-dc converter 510 and the first dc-dc converter 530 operate during a first half cycle of the ac voltage source VAC to provide a stable voltage or current to the load; the second ac-dc converter 520 and the second dc-dc converter 540 operate during the second half cycle of the ac voltage source VAC to provide a stable voltage or current to the load.

In one embodiment, the first ac-dc converter 510 is coupled to the ac voltage source VAC after passing through an EMI filter; the second ac-dc converter 520 is coupled to the ac voltage source VAC after passing through the EMI filter; two common EMI filters, one of which is a double Pi type filter comprising two X capacitors and a common mode inductor combined; a single Pi type filter is formed by combining two X capacitors and an inductor, and the EMI filter is used for passing various safety tests. EMI filters are prior art and will not be described in detail in the specification.

In one embodiment, first ac-dc converter 510 and first dc-dc converter 530 share a first power switch; the second ac-dc converter 520 and the second dc-dc converter 540 share a second power switch. In one embodiment, a power converter includes a first energy storage element, a second energy storage element, a third energy storage element, a fourth energy storage element, and a fifth energy storage element; the first energy storage element is an inductive element, the second energy storage element is an inductive element, the third energy storage element is a capacitive element, the fourth energy storage element is an inductive element, and the fifth energy storage element is a capacitive element. In one embodiment, the first ac-dc converter 510 includes a first energy storage element and a third energy storage element; the second ac-dc converter 520 includes a fourth energy storage element and a fifth energy storage element; the first dc-dc converter 530 includes a second energy storage element; the second dc-dc converter 540 includes a second energy storage element.

The working principle of the present invention is further described below with reference to the embodiment, and a power converter as shown in fig. 1A includes an ac voltage source VAC, an output capacitor CO and a load, and further includes: a first ac-dc converter 510 receiving a first end VAC1 of an ac voltage source VAC as an input voltage anode and a second end VAC2 of the ac voltage source VAC as an input voltage cathode, and outputting a second dc voltage VM21 including a first power switch MP1 and a third power switch MP3; a second ac-dc converter 520 receiving a second end VAC2 of the ac voltage source VAC as an input voltage anode, a first end VAC1 of the ac voltage source VAC as an input voltage cathode, and outputting a third dc voltage VM31 including a second power switch MP2 and a fourth power switch MP4; the first dc-dc converter 530 receives the second dc voltage VM21 as an input voltage to provide a stable voltage VO or current to the load, and includes a first power switch MP1; the second dc-dc converter 540 receives the third dc voltage VM31 as an input voltage, and provides a stable voltage VO or current to the load, including the second power switch MP2; the first ac-dc converter 510 and the first dc-dc converter 530 operate during a first half cycle of the ac voltage source VAC; the second ac-dc converter 520 and the second dc-dc converter 540 operate during the second half cycle of the ac voltage source VAC. The power converter includes a first energy storage element L11 that is an inductor or a primary winding of a transformer, a second energy storage element L21 that is an inductor or a primary winding of a transformer, a third energy storage element CM31 that is a capacitor, a fourth energy storage element L41 that is an inductor or a primary winding of a transformer, and a fifth energy storage element CM51 that is a capacitor.

A power converter as shown in fig. 2A, comprising an ac voltage source VAC, an output capacitor CO and a load, further comprising: a first ac-dc converter 510 receiving a first end VAC1 of an ac voltage source VAC as an input voltage anode and a second end VAC2 of the ac voltage source VAC as an input voltage cathode, and outputting a second dc voltage VM22 including a first power switch MP1 and a third power switch MP3; a second ac-dc converter 520 receiving a second end VAC2 of the ac voltage source VAC as an input voltage anode, a first end VAC1 of the ac voltage source VAC as an input voltage cathode, and outputting a third dc voltage VM32 including a second power switch MP2 and a fourth power switch MP4; a first dc-dc converter 530 for receiving the second dc voltage VM22 as an input voltage to provide a stable voltage VO or current to the load, including the first power switch MP1; the second dc-dc converter 540 receives the third dc voltage VM32 as an input voltage to provide a stable voltage VO or current to the load, including the second power switch MP2; the first ac-dc converter 510 and the first dc-dc converter 530 operate during a first half cycle of the ac voltage source VAC; the second ac-dc converter 520 and the second dc-dc converter 540 operate during the second half cycle of the ac voltage source VAC. The power converter includes a first energy storage element L12 that is an inductor or a primary winding of a transformer, a second energy storage element L22 that is an inductor or a primary winding of a transformer, a third energy storage element CM32 that is a capacitor, a fourth energy storage element L42 that is an inductor or a primary winding of a transformer, and a fifth energy storage element CM52 that is a capacitor.

A power converter as shown in fig. 3A, comprising an ac voltage source VAC, an output capacitor CO and a load, further comprising: a first ac-dc converter 510 receiving a first end VAC1 of an ac voltage source VAC as an input voltage anode and a second end VAC2 of the ac voltage source VAC as an input voltage cathode, and outputting a second dc voltage VM23 including a first power switch MP1 and a third power switch MP3; a second ac-dc converter 520 receiving a second end VAC2 of the ac voltage source VAC as an input voltage anode, a first end VAC1 of the ac voltage source VAC as an input voltage cathode, and outputting a third dc voltage VM33 including a second power switch MP2 and a fourth power switch MP4; the first dc-dc converter 530 receives the second dc voltage VM23 as an input voltage to provide a stable voltage VO or current to the load, and includes a first power switch MP1; the second dc-dc converter 540 receives the third dc voltage VM33 as an input voltage, and provides a stable voltage VO or current to the load, including the second power switch MP2; the first ac-dc converter 510 and the first dc-dc converter 530 operate during a first half cycle of the ac voltage source VAC; the second ac-dc converter 520 and the second dc-dc converter 540 operate during the second half cycle of the ac voltage source VAC. The power converter includes a first energy storage element L13 that is an inductor or a primary winding of a transformer, a second energy storage element L23 that is a transformer, a third energy storage element CM33 that is a capacitor, a fourth energy storage element L43 that is an inductor or a primary winding of a transformer, and a fifth energy storage element CM53 that is a capacitor.

Fig. 4A is another embodiment of the present invention, in which, compared with the embodiment in fig. 3A-3D, fig. 4A is only a transformer replaced by the first energy storage element L13 and the fourth energy storage element L43 in the embodiment in fig. 3A-3D, and the working principle of fig. 4A is similar to that of the embodiment in fig. 3A-3D, and the description will not be repeated. The power converter includes a first energy storage element L14 that is a transformer, a second energy storage element L24 that is a transformer, a third energy storage element CM34 that is a capacitor, a fourth energy storage element L44 that is a transformer, and a fifth energy storage element CM54 that is a capacitor.

Fig. 4B is another embodiment of the present invention, and the working principle of fig. 4B is similar to that of the previous embodiment, compared with that of the previous embodiment, and the description will not be repeated. The power converter includes a first energy storage element L15 that is an inductor or a primary winding of a transformer, a second energy storage element L25 that is a transformer, a third energy storage element CM35 that is a capacitor, a fourth energy storage element L45 that is an inductor or a primary winding of a transformer, and a fifth energy storage element CM55 that is a capacitor.

Fig. 4C is another embodiment of the present invention, and the working principle of fig. 4C is similar to that of the previous embodiment, compared with that of the previous embodiment, and the description will not be repeated. The power converter includes a first energy storage element L16 that is an inductor or a primary winding of a transformer, a second energy storage element L26 that is an inductor or a primary winding of a transformer, a third energy storage element CM36 that is a capacitor, a fourth energy storage element L46 that is an inductor or a primary winding of a transformer, and a fifth energy storage element CM56 that is a capacitor.

In a second aspect, the present invention provides a power conversion circuit.

The power conversion circuit comprises a first energy storage element, a second energy storage element, a third energy storage element, a fourth energy storage element and a fifth energy storage element; the first energy storage element is an inductive element, the second energy storage element is an inductive element, the third energy storage element is a capacitive element, the fourth energy storage element is an inductive element, the fifth energy storage element is a capacitive element, and in a first half period of the alternating current voltage source VAC, in a first working state, the first path receives the voltage of the first half period of the alternating current voltage source VAC to store energy for the first energy storage element, and the first current flowing through the first energy storage element rises; the second path receives a second direct-current voltage VM2X, stores energy of the second energy storage element, and increases a second current flowing through the second energy storage element; in the second working state, the first energy storage element releases energy to the third energy storage element through a third path to generate a second direct-current voltage VM2X on the third energy storage element, and the first current drops; the second energy storage element releases energy to the output capacitor CO and the load through a fourth path, and the second current drops; in the second half period of the alternating current voltage source VAC, in the third working state, the fifth path receives the voltage of the second half period of the alternating current voltage source VAC to store energy of the fourth energy storage element, and the third current flowing through the fourth energy storage element rises; the sixth path receives the third direct-current voltage VM3X, stores energy in the second energy storage element, and increases fourth current flowing through the second energy storage element; in the fourth operating state, the fourth energy storage element releases energy to the fifth energy storage element through the seventh path to generate a third direct voltage VM3X on the fifth energy storage element, and the third current drops; the second energy storage element discharges energy to the output capacitor CO and the load through the eighth path, and the fourth current drops.

In one embodiment, in a first operating state of a first half cycle of the ac voltage source VAC, the first power switch MP1 is in an on state, the second power switch MP2 is in an off state, the third power switch MP3 is in an on state, and the fourth power switch MP4 is in an off state; in a second working state of a first half period of the alternating-current voltage source VAC, the first power switch MP1 is in an off state, and the second power switch MP2 is in an off state; in a third working state of the second half period of the alternating-current voltage source VAC, the first power switch MP1 is in an off state, the second power switch MP2 is in an on state, the third power switch MP3 is in an off state, and the fourth power switch MP4 is in an on state; in a fourth operating state of the second half cycle of the alternating voltage source VAC, the first power switch MP1 is in an off state and the second power switch MP2 is in an off state.

In one embodiment, the third power switch MP3 and the fourth power switch MP4 are partly or wholly diodes. In one embodiment, the first energy storage element, the third energy storage element, the first path, and the third path comprise a first ac-dc converter 510; the fourth energy storage element, the fifth path, and the seventh path constitute a second ac-dc converter 520; the second energy storage element, the second path, and the fourth path constitute a first dc-dc converter 530; the second energy storage element, the sixth path and the eighth path constitute a second dc-dc converter 540. In one embodiment, the third energy storage element and the fifth energy storage element are connected in parallel, and both may be combined into one energy storage element. In one embodiment, the first power switch MP1 and the second power switch MP2 are connected in parallel, and may be combined into one power switch. In one embodiment, the first ac-dc converter 510 and the second ac-dc converter 520 are both boost topologies, or flyback topologies, or buck-boost topologies; the first dc-dc converter 530 and the second dc-dc converter 540 are both buck topologies, either flyback topologies or buck-boost topologies.

The working principle of the present invention is further explained below with reference to the embodiments, and fig. 1A to 1D are schematic diagrams of 4 working states of an embodiment of the present invention; a power conversion circuit as shown in fig. 1A, comprising an ac voltage source VAC, an output capacitor CO and a load, further comprising: a first ac-dc converter 510 receiving a first end VAC1 of an ac voltage source VAC as an input voltage anode and a second end VAC2 of the ac voltage source VAC as an input voltage cathode, and outputting a second dc voltage VM21 including a first power switch MP1 and a third power switch MP3; a second ac-dc converter 520 receiving a second end VAC2 of the ac voltage source VAC as an input voltage anode, a first end VAC1 of the ac voltage source VAC as an input voltage cathode, and outputting a third dc voltage VM31 including a second power switch MP2 and a fourth power switch MP4; the first dc-dc converter 530 receives the second dc voltage VM21 as an input voltage to provide a stable voltage VO or current to the load, and includes a first power switch MP1; the second dc-dc converter 540 receives the third dc voltage VM31 as an input voltage, and provides a stable voltage VO or current to the load, including the second power switch MP2; the first ac-dc converter 510 and the first dc-dc converter 530 operate during a first half cycle of the ac voltage source VAC; the second ac-dc converter 520 and the second dc-dc converter 540 operate during the second half cycle of the ac voltage source VAC. The power conversion circuit includes a first energy storage element L11 that is an inductor or a primary winding of a transformer, a second energy storage element L21 that is an inductor or a primary winding of a transformer, a third energy storage element CM31 that is a capacitor, a fourth energy storage element L41 that is an inductor or a primary winding of a transformer, and a fifth energy storage element CM51 that is a capacitor.

In a first half period of the alternating current voltage source VAC, in a first working state, the first power switch MP1 is in an on state, the second power switch MP2 is in an off state, the third power switch MP3 is in an on state, the fourth power switch MP4 is in an off state, as shown in fig. 1A, the first path P (1) receives a voltage of the first half period of the alternating current voltage source VAC to store energy of the first energy storage element L11, a first current Ich1 of the first path P (1) flows through the alternating current source VAC, the first energy storage element L11, the first power switch MP1, the third power switch MP3 and the first detection resistor RCS1, the first current Ich1 generates a first detection signal VCS1 on the first detection resistor RCS1, and the signal generates overcurrent protection for the first power switch MP 1; the second path P (2) receives the second direct-current voltage VM21 and stores energy in the second energy storage element L21, and a second current Ich2 of the second path P (2) flows through the second direct-current voltage VM21, the first power switch MP1, the second detection resistor RCS2, the output capacitor CO and the load, and the second energy storage element L21; the second current Ich2 generates a second detection signal VCS2 at a second detection resistor RCS2, which may be used to provide an over-current protection for the first power switch MP1, and may also be used to generate a load current feedback for stabilizing the output current or voltage. In the second operating state, the first power switch MP1 is in an off state, the second power switch MP2 is in an off state, the third power switch MP3 is in an on state, and the fourth power switch MP4 is in an off state, as shown in fig. 1B, the first energy storage element L11 releases energy to the third energy storage element CM31 through the third path P (3) to generate the second direct current voltage VM21 on the third energy storage element CM31, the first current Ich1 of the third path P (3) flows through the alternating current source VAC, the first energy storage element L11, the diode D11, the third energy storage element CM31, the first detection resistor RCS1, the second detection resistor RCS2 and the third power switch MP3; the second energy storage element L21 releases energy to the output capacitor CO and the load through the fourth path P (4); the second current Ich2 of the fourth path P (4) flows through the second energy storage element L21, the diode D11, the output capacitance CO and the load.

In the second half period of the ac voltage source VAC, in the third operating state, the first power switch MP1 is in an off state, the second power switch MP2 is in an on state, the third power switch MP3 is in an off state, the fourth power switch MP4 is in an on state, as shown in fig. 1C, the fifth path P (5) receives the voltage of the second half period of the ac voltage source VAC to store energy in the fourth energy storage element L41, the third current Ich3 of the fifth path P (5) flows through the ac voltage source VAC, the fourth energy storage element L41, the second power switch MP2, the fourth power switch MP4 and the first detection resistor RCS1, the third current Ich3 generates a first detection signal VCS1 on the first detection resistor RCS1, and the signal generates an over-current protection for the second power switch MP 2; the sixth path P (6) receives the third dc voltage VM31 and stores energy in the second energy storage element L21, and the fourth current Ich4 of the sixth path P (6) flows through the third dc voltage VM31, the second power switch MP2, the second detection resistor RCS2, the output capacitor CO and the load, and the second energy storage element L21; the fourth current Ich4 generates a second detection signal VCS2 at the second detection resistor RCS2, which may be used to provide an over-current protection for the second power switch MP2, and may also be used to generate a load current feedback for stabilizing the output current or voltage. In the fourth operating state, the first power switch MP1 is in an off state, the second power switch MP2 is in an off state, the third power switch MP3 is in an off state, the fourth power switch MP4 is in an on device, as shown in fig. 1D, the fourth energy storage element L41 releases energy to the fifth energy storage element CM51 through the seventh path P (7) to generate the third direct current voltage VM31 on the fifth energy storage element CM51, the third current Ich3 of the seventh path P (7) flows through the alternating current source VAC, the fourth energy storage element L41, the fifth energy storage element CM51, the diode D11, the first detection resistor RCS1, the second detection resistor RCS2 and the fourth power switch MP4; the second energy storage element L21 discharges energy to the output capacitor CO and the load through the eighth path P (8); the fourth current Ich4 of the eighth path P (8) flows through the second energy storage element L21, the diode D11, the output capacitance CO and the load.

In one embodiment, the first energy storage element L11, the third energy storage element CM31, the first path P (1) and the third path P (3) form a first ac-dc converter 510, which is herein a boost topology; the fourth energy storage element L41, the fifth energy storage element CM51, the fifth path P (5) and the seventh path P (7) form a second ac-dc converter 520, which is herein a boost topology; the second energy storage element L21, the second path P (2) and the fourth path P (4) form a first dc-dc converter 530, here in a buck topology; the second energy storage element L21, the sixth path P (6) and the eighth path P (8) form a second dc-dc converter 540, here a buck topology.

In one embodiment, the power conversion circuit further includes a first control module 111 coupled to the first detection signal VCS1 and the second detection signal VCS2, for generating a first control signal GP1 to drive the first power switch MP1 to be turned on or off according to the received detection signal, and generating a second control signal GP2 to drive the second power switch MP2 to be turned on or off. In one embodiment, the third power switch MP3 and the fourth power switch MP4 are diodes, and do not affect the current flow of the first path P (1), the third path P (3), the fifth path P (5), and the seventh path P (7). In one embodiment, the power conversion circuit further includes a control chip, where the control chip integrates a first control module 111, a first power switch MP1, a second power switch MP2, a third power switch MP3, and a fourth power switch MP4, and outputs a first control signal GP1 to control the first power switch MP1; outputting a second control signal GP2 to control a second power switch MP2; outputting a third control signal GP3 to control a third power switch MP3; outputting a fourth control signal GP4 to control a fourth power switch MP4; by controlling the on and off of the first power switch MP1, the second power switch MP2, the third power switch MP3, and the fourth power switch MP4, a stable voltage VO or current is generated across the load.

FIGS. 2A-2D are schematic illustrations of 4 operational states of one embodiment of the present invention; a power conversion circuit as shown in fig. 2A, comprising an ac voltage source VAC, an output capacitor CO and a load, further comprising: a first ac-dc converter 510 receiving a first end VAC1 of an ac voltage source VAC as an input voltage anode and a second end VAC2 of the ac voltage source VAC as an input voltage cathode, and outputting a second dc voltage VM22 including a first power switch MP1 and a third power switch MP3; a second ac-dc converter 520 receiving a second end VAC2 of the ac voltage source VAC as an input voltage anode, a first end VAC1 of the ac voltage source VAC as an input voltage cathode, and outputting a third dc voltage VM32 including a second power switch MP2 and a fourth power switch MP4; a first dc-dc converter 530 for receiving the second dc voltage VM22 as an input voltage to provide a stable voltage VO or current to the load, including the first power switch MP1; the second dc-dc converter 540 receives the third dc voltage VM32 as an input voltage to provide a stable voltage VO or current to the load, including the second power switch MP2; the first ac-dc converter 510 and the first dc-dc converter 530 operate during a first half cycle of the ac voltage source VAC; the second ac-dc converter 520 and the second dc-dc converter 540 operate during the second half cycle of the ac voltage source VAC. The power conversion circuit includes a first energy storage element L12 that is an inductor or a primary winding of a transformer, a second energy storage element L22 that is an inductor or a primary winding of a transformer, a third energy storage element CM32 that is a capacitor, a fourth energy storage element L42 that is an inductor or a primary winding of a transformer, and a fifth energy storage element CM52 that is a capacitor.

In a first half period of the ac voltage source VAC, in a first operating state, the first power switch MP1 is in an on state, the second power switch MP2 is in an off state, the third power switch MP3 is in an on state, the fourth power switch MP4 is in an off state, as shown in fig. 2A, the first path P (1) receives a voltage of the first half period of the ac voltage source VAC to store energy in the first energy storage element L12, a first current Ich1 of the first path P (1) flows through the ac voltage source VAC, the first energy storage element L12, the first power switch MP1, the third power switch MP3 and the first detection resistor RCS1, the first current Ich1 generates a first detection signal VCS1 on the first detection resistor RCS1, and the signal generates an overcurrent protection for the first power switch MP 1; the second path P (2) receives the second direct-current voltage VM22 and stores energy in the second energy storage element L22, and a second current Ich2 of the second path P (2) flows through the second direct-current voltage VM22, the first power switch MP1, the second detection resistor RCS2 and the second energy storage element L22; the second current Ich2 generates a second detection signal VCS2 at a second detection resistor RCS2, which may be used to provide an over-current protection for the first power switch MP1, and may also be used to generate a load current feedback for stabilizing the output current or voltage. In the second operating state, the first power switch MP1 is in an off state, the second power switch MP2 is in an off state, the third power switch MP3 is in an on state, and the fourth power switch MP4 is in an off state, as shown in fig. 2B, the first energy storage element L12 releases energy to the third energy storage element CM32 through the third path P (3) to generate the second direct current voltage VM22 on the third energy storage element CM32, the first current Ich1 of the third path P (3) flows through the alternating current source VAC, the first energy storage element L12, the diode D12, the third energy storage element CM32, the output capacitor CO and the load, the first detection resistor RCS1, the second detection resistor RCS2 and the third power switch MP3; the second energy storage element L22 releases energy to the output capacitor CO and the load through the fourth path P (4); the second current Ich2 of the fourth path P (4) flows through the second energy storage element L22, the diode D12, the output capacitance CO and the load.

In the second half period of the ac voltage source VAC, in the third operating state, the first power switch MP1 is in an off state, the second power switch MP2 is in an on state, the third power switch MP3 is in an off state, the fourth power switch MP4 is in an on state, as shown in fig. 2C, the fifth path P (5) receives the voltage of the second half period of the ac voltage source VAC to store energy in the fourth energy storage element L42, the third current Ich3 of the fifth path P (5) flows through the ac voltage source VAC, the fourth energy storage element L42, the second power switch MP2, the fourth power switch MP4 and the first detection resistor RCS1, the third current Ich3 generates a first detection signal VCS1 on the first detection resistor RCS1, and the signal generates an over-current protection for the second power switch MP 2; the sixth path P (6) receives the third dc voltage VM32 and stores energy in the second energy storage element L22, and the fourth current Ich4 of the sixth path P (6) flows through the third dc voltage VM32, the second power switch MP2, the second detection resistor RCS2, and the second energy storage element L22; the fourth current Ich4 generates a second detection signal VCS2 at the second detection resistor RCS2, which may be used to provide an over-current protection for the second power switch MP2, and may also be used to generate a load current feedback for stabilizing the output current or voltage. In the fourth operating state, the first power switch MP1 is in an off state, the second power switch MP2 is in an off state, the third power switch MP3 is in an off state, the fourth power switch MP4 is in an on state, as shown in fig. 2D, the fourth energy storage element L42 discharges energy to the fifth energy storage element CM52 through the seventh path P (7) to generate the third direct current voltage VM32 on the fifth energy storage element CM52, the third current Ich3 of the seventh path P (7) flows through the alternating current source VAC, the fourth energy storage element L42, the fifth energy storage element CM52, the diode D12, the output capacitor CO and the load, the first detection resistor RCS1, the second detection resistor RCS2 and the fourth power switch MP4; the second energy storage element L22 discharges energy to the output capacitor CO and the load through the eighth path P (8); the fourth current Ich4 of the eighth path P (8) flows through the second energy storage element L22, the diode D12, the output capacitance CO and the load.

In one embodiment, the first energy storage element L12, the third energy storage element CM32, the first path P (1) and the third path P (3) form a first ac-dc converter 510, here in a boost topology; the fourth energy storage element L42, the fifth energy storage element CM52, the fifth path P (5) and the seventh path P (7) form a second ac-dc converter 520, which is herein a boost topology; the second energy storage element L22, the second path P (2) and the fourth path P (4) form a first dc-dc converter 530, here a buck-boost topology; the second energy storage element L22, the sixth path P (6) and the eighth path P (8) form a second dc-dc converter 540, here a buck-boost topology.

In one embodiment, the power conversion circuit further includes a second control module 112 coupled to the first detection signal VCS1 and the second detection signal VCS2, for generating a first control signal GP1 to drive the first power switch MP1 to be turned on or off according to the received detection signal, and generating a second control signal GP2 to drive the second power switch MP2 to be turned on or off. In one embodiment, the third power switch MP3 and the fourth power switch MP4 are diodes, and do not affect the current flow of the first path P (1), the third path P (3), the fifth path P (5), and the seventh path P (7). In one embodiment, the power conversion circuit further includes a control chip, where the control chip integrates the second control module 112, the first power switch MP1, the second power switch MP2, the third power switch MP3, and the fourth power switch MP4, and outputs a first control signal GP1 to control the first power switch MP1; outputting a second control signal GP2 to control a second power switch MP2; outputting a third control signal GP3 to control a third power switch MP3; outputting a fourth control signal GP4 to control a fourth power switch MP4; by controlling the on and off of the first power switch MP1, the second power switch MP2, the third power switch MP3, and the fourth power switch MP4, a stable voltage VO or current is generated across the load.

FIGS. 3A-3D are schematic illustrations of 4 operational states of one embodiment of the present invention; a power conversion circuit as shown in fig. 3A, comprising an ac voltage source VAC, an output capacitor CO and a load, further comprising: a first ac-dc converter 510 receiving a first end VAC1 of an ac voltage source VAC as an input voltage anode and a second end VAC2 of the ac voltage source VAC as an input voltage cathode, and outputting a second dc voltage VM23 including a first power switch MP1 and a third power switch MP3; a second ac-dc converter 520 receiving a second end VAC2 of the ac voltage source VAC as an input voltage anode, a first end VAC1 of the ac voltage source VAC as an input voltage cathode, and outputting a third dc voltage VM33 including a second power switch MP2 and a fourth power switch MP4; the first dc-dc converter 530 receives the second dc voltage VM23 as an input voltage to provide a stable voltage VO or current to the load, and includes a first power switch MP1; the second dc-dc converter 540 receives the third dc voltage VM33 as an input voltage, and provides a stable voltage VO or current to the load, including the second power switch MP2; the first ac-dc converter 510 and the first dc-dc converter 530 operate during a first half cycle of the ac voltage source VAC; the second ac-dc converter 520 and the second dc-dc converter 540 operate during the second half cycle of the ac voltage source VAC. The power conversion circuit includes a first energy storage element L13 that is an inductor or a primary winding of a transformer, a second energy storage element L23 that is a transformer, a third energy storage element CM33 that is a capacitor, a fourth energy storage element L43 that is an inductor or a primary winding of a transformer, and a fifth energy storage element CM53 that is a capacitor.

In a first half period of the ac voltage source VAC, in a first operating state, the first power switch MP1 is in an on state, the second power switch MP2 is in an off state, the third power switch MP3 is in an on state, the fourth power switch MP4 is in an off state, as shown in fig. 3A, the first path P (1) receives a voltage of the first half period of the ac voltage source VAC to store energy in the first energy storage element L13, a first current Ich1 of the first path P (1) flows through the ac voltage source VAC, the first energy storage element L13, the first power switch MP1, the third power switch MP3 and the first detection resistor RCS1, the first current Ich1 generates a first detection signal VCS1 on the first detection resistor RCS1, and the signal generates an overcurrent protection for the first power switch MP 1; the second path P (2) receives the second direct-current voltage VM23 and stores energy in the second energy storage element L23, and a second current Ich2 of the second path P (2) flows through the second direct-current voltage VM23, the first power switch MP1, the second detection resistor RCS2 and the second energy storage element L23; the second current Ich2 generates a second detection signal VCS2 at a second detection resistor RCS2, which may be used to provide an over-current protection for the first power switch MP1, and may also be used to generate a load current feedback for stabilizing the output current or voltage. In the second operating state, the first power switch MP1 is in an off state, the second power switch MP2 is in an off state, the third power switch MP3 is in an off state, and the fourth power switch MP4 is in an off state, as shown in fig. 3B, the first energy storage element L13 releases energy to the third energy storage element CM33 through the third path P (3) to generate the second dc voltage VM23 on the third energy storage element CM33, and the first current Ich1 of the third path P (3) flows through the first energy storage element L13, the diode D13, and the third energy storage element CM33; the second energy storage element L23 discharges energy to the output capacitor CO and the load through the fourth path P (4); the second current Ich2 of the fourth path P (4) flows through the second energy storage element L23, the diode 33, the output capacitance CO and the load.

In the second half period of the ac voltage source VAC, in the third operating state, the first power switch MP1 is in an off state, the second power switch MP2 is in an on state, the third power switch MP3 is in an off state, the fourth power switch MP4 is in an on state, as shown in fig. 3C, the fifth path P (5) receives the voltage of the second half period of the ac voltage source VAC to store energy in the fourth energy storage element L43, the third current Ich3 of the fifth path P (5) flows through the ac voltage source VAC, the fourth energy storage element L43, the second power switch MP2, the fourth power switch MP4 and the first detection resistor RCS1, the third current Ich3 generates a first detection signal VCS1 on the first detection resistor RCS1, and the signal generates an over-current protection for the second power switch MP 2; the sixth path P (6) receives the third dc voltage VM33 and stores energy in the second energy storage element L23, and the fourth current Ich4 of the sixth path P (6) flows through the third dc voltage VM33, the second power switch MP2, the second detection resistor RCS2, and the second energy storage element L23; the fourth current Ich4 generates a second detection signal VCS2 at the second detection resistor RCS2, which may be used to provide an over-current protection for the second power switch MP2, and may also be used to generate a load current feedback for stabilizing the output current or voltage. In the fourth operating state, the first power switch MP1 is in an off state, the second power switch MP2 is in an off state, the third power switch MP3 is in an off state, the fourth power switch MP4 is in an off state, as shown in fig. 3D, the fourth energy storage element L43 releases energy to the fifth energy storage element CM53 through the seventh path P (7) to generate the third dc voltage VM33 on the fifth energy storage element CM53, the third current Ich3 of the seventh path P (7) flows through the fourth energy storage element L43, the fifth energy storage element CM53, and the diode D23; the second energy storage element L23 discharges energy to the output capacitor CO and the load through the eighth path P (8); the fourth current Ich4 of the eighth path P (8) flows through the second energy storage element L23, the diode D33, the output capacitance CO, and the load.

In the embodiment of fig. 3A-3D, the first energy storage element L13, the third energy storage element CM33, the first path P (1) and the third path P (3) form a first ac-dc converter 510, here a buck-boost topology; the fourth energy storage element L43, the fifth energy storage element CM53, the fifth path P (5) and the seventh path P (7) form a second ac-dc converter 520, which is herein a buck-boost topology; the second energy storage element L23, the second path P (2) and the fourth path P (4) form a first dc-dc converter 530, which is herein a flyback topology; the second energy storage element L23, the sixth path P (6) and the eighth path P (8) form a second dc-dc converter 540, which is herein a flyback topology.

In the embodiment of fig. 3A to 3D, the power conversion circuit further includes a third control module 113 coupled to the first detection signal VCS1 and the second detection signal VCS2, for generating the first control signal GP1 to drive the first power switch MP1 to be turned on or off according to the received detection signal, and generating the second control signal GP2 to drive the second power switch MP2 to be turned on or off.

In the embodiments of fig. 3A-3D, the third power switch MP3 and the fourth power switch MP4 are diodes, and do not affect the current flow direction of the first path P (1), the third path P (3), the fifth path P (5), and the seventh path P (7).

In the embodiment of fig. 3A-3D, the power conversion circuit further includes a control chip, where the control chip integrates a third control module 113, a first power switch MP1, a second power switch MP2, a third power switch MP3, and a fourth power switch MP4, and outputs a first control signal GP1 to control the first power switch MP1; outputting a second control signal GP2 to control a second power switch MP2; outputting a third control signal GP3 to control a third power switch MP3; outputting a fourth control signal GP4 to control a fourth power switch MP4; by controlling the on and off of the first power switch MP1, the second power switch MP2, the third power switch MP3, and the fourth power switch MP4, a stable voltage VO or current is generated across the load.

Fig. 4A is another embodiment of the present invention, in which, compared with the embodiment in fig. 3A-3D, fig. 4A is only a transformer replaced by the first energy storage element L13 and the fourth energy storage element L43 in the embodiment in fig. 3A-3D, and the working principle of fig. 4A is similar to that of the embodiment in fig. 3A-3D, and the description will not be repeated. In the embodiment of fig. 4A, the first energy storage element L14, the third energy storage element CM34, the first path P (1) and the third path P (3) form a first ac-dc converter 510, here in a flyback topology; the fourth energy storage element L44, the fifth energy storage element CM54, the fifth path P (5) and the seventh path P (7) form a second ac-dc converter 520, which is herein a flyback topology; the second energy storage element L24, the second path P (2) and the fourth path P (4) form a first dc-dc converter 530, which is herein a flyback topology; the second energy storage element L24, the sixth path P (6) and the eighth path P (8) form a second dc-dc converter 540, which is herein a flyback topology.

In the embodiment of fig. 4A, the power conversion circuit further includes a fourth control module 114 coupled to the first detection signal VCS1 and the second detection signal VCS2, for generating a first control signal GP1 to drive the first power switch MP1 to be turned on or off according to the received detection signal, and generating a second control signal GP2 to drive the second power switch MP2 to be turned on or off. In the embodiment of fig. 4A, the third power switch MP3 and the fourth power switch MP4 are diodes, and do not affect the current flow of the first path P (1), the third path P (3), the fifth path P (5), and the seventh path P (7). In the embodiment of fig. 4A, the power conversion circuit further includes a control chip, where the control chip integrates a fourth control module 114, a first power switch MP1, a second power switch MP2, a third power switch MP3, and a fourth power switch MP4, and outputs a first control signal GP1 to control the first power switch MP1; outputting a second control signal GP2 to control a second power switch MP2; outputting a third control signal GP3 to control a third power switch MP3; outputting a fourth control signal GP4 to control a fourth power switch MP4; by controlling the on and off of the first power switch MP1, the second power switch MP2, the third power switch MP3, and the fourth power switch MP4, a stable voltage or current is generated on the load.

Fig. 4B is another embodiment of the present invention, and the working principle and analysis process of fig. 4B are similar to those of the previous embodiment, in comparison with the previous embodiment, and the description will not be repeated. In the embodiment of fig. 4B, the first energy storage element L15, the third energy storage element CM35, the first path P (1) and the third path P (3) form a first ac-dc converter 510, here in a boost topology; the fourth energy storage element L45, the fifth energy storage element CM55, the fifth path P (5) and the seventh path P (7) form a second ac-dc converter 520, which is herein a boost topology; the second energy storage element L25, the second path P (2) and the fourth path P (4) form a first dc-dc converter 530, which is herein a flyback topology; the second energy storage element L25, the sixth path P (6) and the eighth path P (8) form a second dc-dc converter 540, which is herein a flyback topology.

In the embodiment of fig. 4B, the power conversion circuit further includes a fifth control module 115 coupled to the first detection signal VCS1 and the second detection signal VCS2, for generating a first control signal GP1 to drive the first power switch MP1 to be turned on or off according to the received detection signal, and generating a second control signal GP2 to drive the second power switch MP2 to be turned on or off. In the embodiment of fig. 4B, the third power switch MP3 and the fourth power switch MP4 are diodes, and do not affect the current flow of the first path P (1), the third path P (3), the fifth path P (5), and the seventh path P (7). In the embodiment of fig. 4B, the power conversion circuit further includes a control chip, where the control chip integrates a fifth control module 115, a first power switch MP1, a second power switch MP2, a third power switch MP3, and a fourth power switch MP4, and outputs a first control signal GP1 to control the first power switch MP1; outputting a second control signal GP2 to control a second power switch MP2; outputting a third control signal GP3 to control a third power switch MP3; outputting a fourth control signal GP4 to control a fourth power switch MP4; by controlling the on and off of the first power switch MP1, the second power switch MP2, the third power switch MP3, and the fourth power switch MP4, a stable voltage VO or current is generated across the load. In the embodiment of fig. 4B, the third energy storage element CM35 and the fifth energy storage element CM55 are connected in parallel, and the third energy storage element CM35 and the fifth energy storage element CM55 may be combined into one energy storage element.

In the embodiment of fig. 4B, the first power switch MP1 and the second power switch MP2 are connected in parallel, and the first power switch MP1 and the second power switch MP2 may be combined into one switching element.

Fig. 4C is another embodiment of the present invention, and the working principle and analysis process of fig. 4C are similar to those of the previous embodiment, in comparison with the previous embodiment, and the description will not be repeated. In the embodiment of fig. 4C, the first energy storage element L16, the third energy storage element CM36, the first path P (1) and the third path P (3) form a first ac-dc converter 510, here in a boost topology; the fourth energy storage element L46, the fifth energy storage element CM56, the fifth path P (5) and the seventh path P (7) form a second ac-dc converter 520, here a boost topology; the second energy storage element L26, the second path P (2) and the fourth path P (4) form a first dc-dc converter 530, here in a buck topology; the second energy storage element L26, the sixth path P (6) and the eighth path P (8) form a second dc-dc converter 540, here a buck topology.

In the embodiment of fig. 4C, the power conversion circuit further includes a sixth control module 116, coupled to the first detection signal VCS1 and the second detection signal VCS2, for generating the first control signal GP1 to drive the first power switch MP1 to be turned on or off according to the received detection signal, and generating the second control signal GP2 to drive the second power switch MP2 to be turned on or off. In the embodiment of fig. 4C, the third power switch MP3 and the fourth power switch MP4 are diodes, and do not affect the current flow of the first path P (1), the third path P (3), the fifth path P (5), and the seventh path P (7). In the embodiment of fig. 4C, the power conversion circuit further includes a control chip, where the control chip integrates a sixth control module 116, a first power switch MP1, a second power switch MP2, a third power switch MP3, and a fourth power switch MP4, and outputs a first control signal GP1 to control the first power switch MP1; outputting a second control signal GP2 to control a second power switch MP2; outputting a third control signal GP3 to control a third power switch MP3; outputting a fourth control signal GP4 to control a fourth power switch MP4; by controlling the on and off of the first power switch MP1, the second power switch MP2, the third power switch MP3, and the fourth power switch MP4, a stable voltage VO or current is generated across the load. In the embodiment of fig. 4C, the third energy storage element CM36 and the fifth energy storage element CM56 are connected in parallel, and the third energy storage element CM36 and the fifth energy storage element CM56 may be combined into one energy storage element.

As can be seen from the above embodiments, the first ac-dc converter and the second ac-dc converter may be both boost topology, flyback topology, or buck-boost topology; the first dc-dc converter and the second dc-dc converter may be both buck topologies, or flyback topologies, or buck-boost topologies.

In a third aspect, the present application also provides an electronic device, including the power converter of the first aspect, or the power conversion circuit of the second aspect.

From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

the power converter, the power conversion circuit and the electronic equipment of the application eliminate the rectifier bridge coupled with the alternating voltage source, simplify the structure of the cascaded two-stage power supply circuit, remarkably reduce the loss of the power supply circuit and improve the efficiency and the performance of the power supply circuit.

It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other. It should also be noted that, in this document, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Moreover, relational terms such as "first" and "second" may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions, or order, and without necessarily being construed as indicating or implying any relative importance. "and/or" means either or both of which may be selected. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or terminal device comprising the element. The foregoing has outlined rather broadly the more detailed description of the application in order that the detailed description of the application that follows may be better understood, and in order that the present contribution to the art may be better appreciated. While various modifications of the embodiments and applications of the application will occur to those skilled in the art, it is not necessary and not intended to be exhaustive of all embodiments, and obvious modifications or variations of the application are within the scope of the application.

Claims (11)

1. A power converter comprising an ac voltage source, an output capacitor and a load, further comprising:

the first alternating current-direct current converter receives a first end of the alternating current voltage source as an input voltage anode, a second end of the alternating current voltage source as an input voltage cathode and outputs a second direct current voltage;

the second alternating current-direct current converter receives the second end of the alternating current voltage source as an input voltage anode, and the first end of the alternating current voltage source as an input voltage cathode to output a third direct current voltage;

the first direct current-direct current converter receives the second direct current voltage as an input voltage;

the second direct current-direct current converter receives the third direct current voltage as an input voltage;

the first AC-DC converter and the first DC-DC converter work in a first half period of an AC voltage source to provide stable voltage or current for a load;

the second ac-dc converter and the second dc-dc converter operate during a second half cycle of the ac voltage source to provide a regulated voltage or current to the load.

2. The power converter of claim 1, wherein the power converter comprises a power converter,

the first AC-DC converter and the first DC-DC converter share a first power switch;

The second ac-dc converter and the second dc-dc converter share a second power switch.

3. The power converter of claim 1, wherein the power converter comprises a first energy storage element, a second energy storage element, a third energy storage element, a fourth energy storage element, and a fifth energy storage element; the first energy storage element is an inductive element, the second energy storage element is an inductive element, the third energy storage element is a capacitive element, the fourth energy storage element is an inductive element, and the fifth energy storage element is a capacitive element.

4. A power conversion circuit comprising an ac voltage source, an output capacitor and a load, further comprising: a first energy storage element, a second energy storage element, a third energy storage element, a fourth energy storage element and a fifth energy storage element; the first energy storage element is an inductive element, the second energy storage element is an inductive element, the third energy storage element is a capacitive element, the fourth energy storage element is an inductive element, and the fifth energy storage element is a capacitive element;

in a first half period of an alternating current voltage source, in a first working state, a first path receives voltage of the first half period of the alternating current voltage source to store energy of the first energy storage element, and first current flowing through the first energy storage element rises; a second path receives a second direct-current voltage, stores energy of the second energy storage element, and increases a second current flowing through the second energy storage element; in a second operating state, the first energy storage element releases energy to the third energy storage element through a third path to generate the second direct voltage on the third energy storage element, and the first current drops; the second energy storage element discharges energy to an output capacitor and a load through a fourth path, and the second current drops;

In the second half period of the alternating current voltage source, in a third working state, the fifth path receives the voltage of the second half period of the alternating current voltage source to store energy of the fourth energy storage element, and the third current flowing through the fourth energy storage element rises; a sixth path receives a third direct-current voltage, stores energy of the second energy storage element, and increases a fourth current flowing through the second energy storage element; in a fourth operating state, the fourth energy storage element releasing energy to the fifth energy storage element through a seventh path to generate the third direct voltage on the fifth energy storage element, and the third current decreases; the second energy storage element discharges energy to an output capacitance and a load through an eighth path, and the fourth current drops.

5. The power conversion circuit of claim 4, wherein,

when the first working state of the first half cycle of the alternating-current voltage source is in an on state, the second power switch is in an off state, the third power switch is in an on state, and the fourth power switch is in an off state;

when the first half-cycle second working state of the alternating-current voltage source is, the first power switch is in an off state, and the second power switch is in an off state;

When the first power switch is in a first working state of a first half cycle of the alternating-current voltage source, the second power switch is in a second working state, the third power switch is in a second working state, and the fourth power switch is in a third working state;

in a fourth operating state of the second half cycle of the alternating voltage source, the first power switch is in an off state and the second power switch is in an off state.

6. The power conversion circuit of claim 5, wherein the third power switch and the fourth power switch are partially or fully diodes.

7. The power conversion circuit of claim 4, wherein,

the first detection resistor is positioned on a common path of the first path and the fifth path and is used for detecting the current of the first path or the fifth path to generate a first detection signal;

the second detection resistor is positioned on a common path of the second path and the sixth path and is used for detecting the current of the second path or the sixth path to generate a second detection signal;

the power conversion circuit further comprises a control module, which is coupled with the first detection signal and the second detection signal and controls the first power switch or the second power switch to be turned on or turned off according to the detection signals.

8. The power conversion circuit of claim 7, wherein,

the power conversion circuit further comprises a control chip, and the control module, the first power switch, the second power switch, the third power switch and the fourth power switch are integrated.

9. The power conversion circuit of claim 4, wherein,

the first energy storage element, the third energy storage element, the first path and the third path form a first alternating current-direct current converter;

the fourth energy storage element, the fifth path and the seventh path form a second alternating current-direct current converter;

the second energy storage element, the second path and the fourth path form a first direct current-direct current converter;

the fifth energy storage element, the sixth path and the eighth path form a second direct current-direct current converter;

the first alternating current-direct current converter and the second alternating current-direct current converter are both of a boost type topological structure, a flyback type topological structure or a boost type topological structure; the first DC-DC converter and the second DC-DC converter are both of a buck topology structure, a flyback topology structure or a buck-boost topology structure.

10. The power conversion circuit of claim 9, wherein the power conversion circuit comprises,

the third energy storage element is connected with the fifth energy storage element in parallel, and the third energy storage element and the fifth energy storage element can be combined into one energy storage element; and/or the first power switch MP1 and the second power switch MP2 are connected in parallel, and the two may be combined into one power switch.

11. An electronic device comprising the power converter or power conversion circuit of any one of claims 1 to 10.