CN109104087B - DC-DC converter with bridgeless power factor correction function - Google Patents

DC-DC converter with bridgeless power factor correction function Download PDF

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Publication number
CN109104087B
CN109104087B CN201811322915.9A CN201811322915A CN109104087B CN 109104087 B CN109104087 B CN 109104087B CN 201811322915 A CN201811322915 A CN 201811322915A CN 109104087 B CN109104087 B CN 109104087B
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energy storage
transistor switch
storage unit
turned
circuit
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CN109104087A (en
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李长潭
杨育程
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Yaruiyuan Technology Shenzhen Co ltd
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Yaruiyuan Technology Shenzhen Co ltd
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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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention discloses a direct current-direct current converter with a bridgeless power factor correction function, and particularly relates to the technical field of converters. The power supply comprises a first circuit, a second circuit and a power supply control circuit, wherein the first circuit is coupled with a live wire end of an alternating current power supply; the first circuit comprises a first energy storage unit and a voltage conversion circuit which are coupled in series; the second circuit is coupled with the neutral terminal of the alternating current power supply and is coupled with the first circuit; the second circuit comprises a second energy storage unit and a power switch circuit which are coupled in series; the second energy storage unit is coupled with a live wire end, and the power switch circuit is coupled with the voltage conversion circuit and the neutral wire end; the invention aims to simplify the circuit structure, reduce the production cost, improve the production efficiency and be portable in use. The invention is applied to the uninterruptible power system.

Description

DC-DC converter with bridgeless power factor correction function
The technical field is as follows:
the present invention relates to a dc-dc converter, and more particularly, to a dc-dc converter having a bridgeless power factor correction function.
Background art:
currently, compared to a conventional bridge rectifier, a converter with a non-bridge PFC (Power Factor Correction) function improves efficiency by reducing Power diode conduction loss. For example, when the device is applied to a battery mode under a 3KVA framework of a current Uninterruptible Power System (UPS), the device continuously provides power supply of a backup AC power supply for load devices such as electrical appliances and the like under the condition of power grid abnormality or power failure so as to maintain the normal operation of the electrical appliances. Uninterruptible power systems are commonly used to maintain uninterrupted power to critical commercial devices or sophisticated equipment such as computers, servers, etc., preventing loss of data, interruption of communications, or loss of control of the device.
However, when the current Uninterruptible Power System (UPS) operates in a battery mode under a 3KVA architecture, the most common application is to use the UPS with a lead-acid battery, which has a large size, a short service life, and a time-consuming and cost-consuming maintenance, and the conventional DC-to-DC (DC-to-DC) converter is a Push-Pull architecture, which is different from a Boost circuit at one end of an ac power grid. Therefore, the lead-acid battery occupies too much wiring area on the circuit board, increases the substrate of the circuit board and the processing time, and increases the volume and the cost of the UPS due to the volume of the lead-acid battery and the increase of the Push-Pull circuit structure.
Therefore, how to design an improved dc-dc converter, especially an improvement of simplified circuit structure to solve the above-mentioned technical problem of increasing the volume and cost of the uninterruptible power system, is an important technical point studied by the present application.
The invention content is as follows:
in order to solve the problem of the volume and cost increase of the UPS; the invention provides a DC-DC converter with bridgeless power factor correction function.
The invention is used for providing uninterrupted power supply in a commercial power mode or a battery mode for a load, and the direct current-direct current converter with the bridgeless power factor correction function comprises a first circuit coupled with a live wire end of an alternating current power supply; the first circuit comprises a first energy storage unit and a voltage conversion circuit which are coupled in series; the first energy storage unit is coupled with a live wire end, and the voltage conversion circuit is coupled with a neutral wire end of an alternating current power supply; and
the second circuit is coupled with a neutral terminal of the alternating current power supply and is coupled with the first circuit; the second circuit comprises a second energy storage unit and a power switch circuit which are coupled in series; the second energy storage unit is coupled with a live wire end, and the power switch circuit is coupled with the voltage conversion circuit and the neutral wire end;
when the alternating current power supply is normal, the alternating current power supply supplies power to the load in a mains supply mode through the first circuit; when the alternating current power supply is abnormal, the second energy storage unit provides power supply in a battery mode for the load through the power switch circuit and the first circuit.
Preferably, the voltage conversion circuit includes a first transistor switch and a second transistor switch coupled in series, a first diode and a first capacitor coupled in series, a second diode and a second capacitor coupled in series; wherein the first transistor switch is coupled to the first energy storage unit, the first diode and the second diode; the second transistor switch is coupled to the second circuit, the first capacitor and the second capacitor.
Preferably, the power switch circuit includes a third diode and a third transistor switch and a fourth transistor switch coupled in series; the third transistor switch is coupled with the second transistor switch, the first capacitor, the second capacitor and the neutral line terminal, and the fourth transistor switch is coupled with the second energy storage unit; one end of the third diode is coupled to the first diode and the first capacitor, and the other end of the third diode is coupled to the third transistor switch and the fourth transistor switch.
Preferably, when operating in the mains mode and when the dc-dc converter is operating for a positive half cycle: the first transistor switch is turned on, the second transistor switch is turned on, the third transistor switch is turned off, the fourth transistor switch is turned off, and the first energy storage unit is in energy storage operation; and the first transistor switch is turned off, the second transistor switch is turned off, the third transistor switch is turned off and the fourth transistor switch is turned off, and the first energy storage unit is operated by releasing energy.
Preferably, when the first energy storage unit is in energy storage operation, the live wire end, the first energy storage unit, the first transistor switch, the second transistor switch and the neutral wire end form a first energy storage path; and when the first energy storage unit is in energy release operation, a first energy release path is formed by the live wire end, the first energy storage unit, the first diode, the first capacitor and the neutral wire end.
Preferably, when operating in the mains mode, and when the dc-dc converter is operating for a negative half cycle: the first transistor switch is turned on, the second transistor switch is turned on, the third transistor switch is turned off, the fourth transistor switch is turned off, and the first energy storage unit is in energy storage operation; and the first transistor switch is turned off, the second transistor switch is turned off, the third transistor switch is turned off and the fourth transistor switch is turned off, and the first energy storage unit is operated by releasing energy.
Preferably, when the first energy storage unit is in energy storage operation, the neutral terminal, the second transistor switch, the first energy storage unit and the fire terminal form a second energy storage path; and when the first energy storage unit is in energy release operation, the neutral terminal, the second capacitor, the second diode, the first energy storage unit and the fire terminal form a second energy release path.
Preferably, when operating in battery mode and when the dc-dc converter is operating for a positive half cycle: the first transistor switch is conducted, the second transistor switch is conducted, the third transistor switch is conducted, the fourth transistor switch is conducted, and the first energy storage unit is in energy storage operation; and the first transistor switch is turned on, the second transistor switch is turned on, the third transistor switch is turned off and the fourth transistor switch is turned on, and the first energy storage unit is operated by releasing energy.
Preferably, when the first energy storage unit is in energy storage operation, the anode of the second energy storage unit, the fourth transistor switch, the third transistor switch, the second transistor switch, the first energy storage unit and the cathode of the second energy storage unit form a third energy storage path; and when the first energy storage unit is in energy releasing operation, the anode of the second energy storage unit, the fourth transistor switch, the third transistor switch, the first capacitor, the second transistor switch, the first energy storage unit and the cathode of the second energy storage unit form a third energy releasing path.
Preferably, when operating in battery mode and when the dc-dc converter is operating for negative half cycles: the first transistor switch is conducted, the second transistor switch is conducted, the third transistor switch is conducted, the fourth transistor switch is conducted, and the first energy storage unit is in energy storage operation; and the first transistor switch is turned off, the second transistor switch is turned off, the third transistor switch is turned on, the fourth transistor switch is turned on, and the first energy storage unit is operated by releasing energy.
Preferably, when the first energy storage unit is in energy storage operation, the anode of the second energy storage unit, the fourth transistor switch, the third transistor switch, the second transistor switch, the first energy storage unit and the cathode of the second energy storage unit form a fourth energy storage path; and when the first energy storage unit is in energy release operation, the anode of the second energy storage unit, the fourth transistor switch, the third transistor switch, the second capacitor, the second diode, the first energy storage unit and the cathode of the second energy storage unit form a fourth energy release path.
Compared with the prior art, the invention has the beneficial effects that:
1. when the dc-dc converter with the bridgeless power factor correction function according to the present invention is used, if the ac power is normal, the ac power supplies the load with the power in the utility power mode through the first circuit, wherein the voltage conversion circuit of the first circuit may perform a voltage conversion process (e.g., boost) on the ac power and then provide the ac power to the load; if the alternating current power supply is abnormal (such as sudden wave, undervoltage or power failure), the power switch circuit in the second circuit can control the on and off of the circuit, so that the electric energy output by the second energy storage unit can enter the voltage conversion circuit of the first circuit through the power switch circuit to perform voltage conversion processing, and the second energy storage unit provides power supply in a battery mode for the load through the power switch circuit and the first circuit.
Therefore, when the alternating current power supply is abnormal, the second energy storage unit can be enabled to perform voltage conversion processing through the voltage conversion circuit of the first circuit only through the power switch circuit, and other voltage conversion circuits (such as converters) which are independent of the alternating current power supply flowing path are not needed.
2. The invention can reduce the time of circuit board base material and process by improving the simplified circuit structure without occupying extra circuit board volume and wiring area, thereby solving the technical problem of volume and cost increase of the UPS system, and achieving the purposes of reducing production cost, improving production efficiency and being portable in use.
Description of the drawings:
for ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.
FIG. 1 is a schematic block diagram of an architecture configured in an UPS in accordance with an embodiment of the present invention;
FIG. 2 is a circuit diagram of a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a first energy storage path in the commercial power mode and during the positive half cycle operation according to the present invention;
FIG. 4 is a schematic diagram of a first energy release path when the present invention operates in the commercial power mode and operates in the positive half cycle;
FIG. 5 is a diagram illustrating a second energy storage path in the commercial power mode and during the negative half cycle operation according to the present invention;
FIG. 6 is a schematic diagram of a second energy release path in the commercial power mode and during the negative half cycle operation according to the present invention;
FIG. 7 is a schematic diagram of a third energy storage path in the battery mode and during the positive half cycle operation of the present invention;
FIG. 8 is a schematic diagram of a third energy release path when the present invention is operating in battery mode and operating in a positive half cycle;
FIG. 9 is a diagram illustrating a fourth energy storage path in the battery mode and during the negative half cycle of operation according to the present invention;
FIG. 10 is a diagram illustrating a fourth energy release path when the present invention is operating in battery mode and operating in negative half cycle.
The specific implementation mode is as follows:
the first embodiment is as follows:
referring to fig. 1 and 2, the present embodiment is applied to provide a load 200 with a commercial power mode or a battery mode without power interruption, and the dc-dc converter with bridgeless power factor correction function includes: the circuit comprises a first circuit 10 and a second circuit 20, wherein the first circuit 10 is coupled to a live wire end L of an alternating current power supply; the first circuit 10 includes a first energy storage unit 11 (shown as element L1, which is an inductor in this embodiment) and a voltage conversion circuit 12 coupled in series; the first energy storage unit 11 is coupled to a line terminal L, and the voltage conversion circuit 12 is coupled to a neutral terminal N of an ac power supply. In detail, the voltage conversion circuit 12 includes a first transistor switch Q1 and a second transistor switch Q2 coupled in series, a first diode D1 and a first capacitor C1 coupled in series, a second diode D2 and a second capacitor C2 coupled in series; wherein, the first transistor switch Q1 is coupled to the first energy storage unit L1, the first diode D1 and the second diode D2; the second transistor switch Q2 is coupled to the second circuit 20, the first capacitor C1 and the second capacitor C2;
the second circuit 20 is coupled to the neutral terminal N of the ac power source and is coupled to the first circuit 10; the second circuit 20 includes a second energy storage unit 21 (shown as element B1, in this embodiment, a lithium battery) and a power switch circuit 22 coupled in series; the second energy storage unit 21 is coupled to the line terminal L, and the power switch circuit 22 is coupled to the voltage conversion circuit 12 and the neutral terminal N. In detail, the power switch circuit 22 includes a third diode D3 and a third transistor switch Q3 and a fourth transistor switch Q4 coupled in series; the third transistor switch Q3 is coupled to the second transistor switch Q2, the first capacitor C1, the second capacitor C2 and the neutral terminal N, and the fourth transistor switch Q4 is coupled to the second energy storage unit B1; one end of the third diode D3 is coupled to the first diode D1 and the first capacitor C1, and the other end of the third diode D3 is coupled to the third transistor switch Q3 and the fourth transistor switch Q4. Incidentally, each of the transistor switches may be, for example, but not limited to, a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), a Bipolar Junction Transistor (BJT), or an Insulated Gate Bipolar Transistor (IGBT).
In the embodiment of the present invention, the dc-dc converter with the bridgeless power factor correction function is coupled to the input filter circuit 300, which may be an EMI filter circuit, for filtering out noise such as electromagnetic interference (EMI) of the input ac power (as shown in fig. 1), and the dc-dc converter with the bridgeless power factor correction function converts the dc power output by the dc-dc converter with the bridgeless power factor correction function into ac power by coupling the inverter 400, and filters out noise such as electromagnetic interference (EMI) output to the load 200 by coupling the output filter circuit 500. When the ac power supply is normal, the ac power supply provides the load 200 with the power supply in the mains supply mode through the first circuit 10; when the ac power supply is abnormal, the second energy storage unit 21 provides the load 200 with power in a battery mode through the power switch circuit 22 and the first circuit 10. Therefore, when the ac power supply is normal or abnormally disabled, the load 200 can be supplied with power without interruption.
Referring to fig. 3 and 4, when the dc-dc converter with bridgeless power factor correction function operates in the utility power mode (when the ac power is normal), and when the dc-dc converter operates in the positive half cycle:
as shown in fig. 3, the first energy storage unit L1 is in energy storage operation by controlling the first transistor switch Q1 to be turned on, the second transistor switch Q2 to be turned on, the third transistor switch Q3 to be turned off, and the fourth transistor switch Q4 to be turned off; when the first energy storage unit L1 is in energy storage operation, the live line terminal L, the first energy storage unit L1, the first transistor switch Q1, the second transistor switch Q2 and the neutral line terminal N form a first energy storage path Lns1 for storing energy in the first energy storage unit L1; and
as shown in fig. 4, by controlling the first transistor switch Q1 to be turned off, the second transistor switch Q2 to be turned off, the third transistor switch Q3 to be turned off, and the fourth transistor switch Q4 to be turned off, the first energy storage unit L1 is operated to release energy; when the first energy storing unit L1 is in the discharging operation, the live end L, the first energy storing unit L1, the first diode D1, the first capacitor C1 and the neutral end N form a first discharging path Lnr1 for discharging the first energy storing unit L1.
Referring to fig. 5 and fig. 6, when the dc-dc converter with bridgeless power factor correction function operates in the utility power mode (when the ac power is normal), and when the dc-dc converter operates in the negative half cycle:
as shown in fig. 5, the first energy storage unit L1 is in energy storage operation by controlling the first transistor switch Q1 to be turned on, the second transistor switch Q2 to be turned on, the third transistor switch Q3 to be turned off, and the fourth transistor switch Q4 to be turned off; when the first energy storage unit L1 is in energy storage operation, the neutral terminal N, the second transistor switch Q2, the first transistor switch Q1, the first energy storage unit L1 and the live terminal L form a second energy storage path Lns2 for storing energy in the first energy storage unit L1.
As shown in fig. 6, by controlling the first transistor switch Q1 to be turned off, the second transistor switch Q2 to be turned off, the third transistor switch Q3 to be turned off, and the fourth transistor switch Q4 to be turned off, the first energy storage unit L1 is operated to release energy; when the first energy storage unit L1 is in the discharging operation, the neutral terminal N, the second capacitor C2, the second diode D2, the first energy storage unit L1 and the fire terminal L form a second discharging path Lnr2 for discharging the first energy storage unit L1.
Referring to fig. 7 and 8, when the dc-dc converter with bridgeless power factor correction function operates in the battery mode (when the ac power is abnormal), and when the dc-dc converter operates in the positive half cycle:
as shown in fig. 7, by controlling the first transistor switch Q1 to be turned on, the second transistor switch Q2 to be turned on, the third transistor switch Q3 to be turned on, and the fourth transistor switch Q4 to be turned on, the first energy storage unit L1 is in energy storage operation; when the first energy storage unit L1 is in energy storage operation, the anode of the second energy storage unit B1, the fourth transistor switch Q4, the third transistor switch Q3, the second transistor switch Q2, the first transistor switch Q1, the first energy storage unit L1, and the cathode of the second energy storage unit B1 form a third energy storage path Lns3 for storing energy in the first energy storage unit L1.
As shown in fig. 8, by controlling the first transistor switch Q1 to be turned on, the second transistor switch Q2 to be turned on, the third transistor switch Q3 to be turned off, and the fourth transistor switch Q4 to be turned on, the first energy storage unit L1 is operated to release energy; when the first energy storage unit L1 is operated to release energy, the anode of the second energy storage unit B1, the fourth transistor switch Q4, the third transistor switch Q3, the first capacitor C1, the second transistor switch Q2, the first transistor switch Q1, the first energy storage unit L1, and the cathode of the second energy storage unit B1 form a third energy release path Lnr3 for releasing energy of the first energy storage unit L1.
Referring to fig. 9 and 10, when the dc-dc converter with the bridgeless power factor correction function operates in the battery mode (when the ac power is abnormal), and when the dc-dc converter operates in the negative half cycle:
as shown in fig. 9, by controlling the first transistor switch Q1 to be turned on, the second transistor switch Q2 to be turned on, the third transistor switch Q3 to be turned on, and the fourth transistor switch Q4 to be turned on, the first energy storage unit L1 is in energy storage operation; when the first energy storage unit L1 is in energy storage operation, the anode of the second energy storage unit B1, the fourth transistor switch Q4, the third transistor switch Q3, the second transistor switch Q2, the first transistor switch Q1, the first energy storage unit L1, and the cathode of the second energy storage unit B1 form a fourth energy storage path Lns4 for storing energy in the first energy storage unit L1.
As shown in fig. 10, by controlling the first transistor switch Q1 to be turned off, the second transistor switch Q2 to be turned off, the third transistor switch Q3 to be turned on, and the fourth transistor switch Q4 to be turned on, the first energy storage unit L1 is operated to release energy; when the first energy storage unit L1 is in the energy releasing operation, the anode of the second energy storage unit B1, the fourth transistor switch Q4, the third transistor switch Q3, the second capacitor C2, the second diode D2, the first energy storage unit L1, and the cathode of the second energy storage unit B1 form a fourth energy releasing path Lnr4 for releasing energy from the first energy storage unit L1.
As described above, when the dc-dc converter with bridgeless power factor correction function of the present invention is used, if the ac power is normal, the ac power supplies the load 200 with the power in the utility mode through the first circuit 10, wherein the voltage conversion circuit 12 of the first circuit 10 can perform the voltage conversion processing (for example, Boost) on the ac power and then provide the processed ac power to the load; for example, in case of an ac power abnormality (e.g., a surge, an undervoltage or a power failure), the power switch circuit 22 in the second circuit 20 may control the third transistor switch Q3 and the fourth transistor switch Q4 to turn on and off, so that the electric energy output by the second energy storage unit B1 may enter the voltage conversion circuit 12 of the first circuit 10 through the power switch circuit 22 for voltage conversion processing, and the second energy storage unit B1 provides the load 200 with battery-mode power through the power switch circuit 22 and the first circuit 10.
Therefore, when the ac power supply is abnormal, the second energy storage unit B1 can perform the voltage conversion processing through the voltage conversion circuit 12 of the first circuit 10 only by the power switch circuit 22, and does not need to be additionally independent of other voltage conversion circuits (such as a Push-Pull converter) outside the ac power supply flowing path.

Claims (9)

1. A dc-dc converter with bridgeless power factor correction for providing a load with a mains-mode or battery-mode uninterruptible power supply, comprising: the power supply comprises a first circuit, a second circuit and a power supply control circuit, wherein the first circuit is coupled with a live wire end of an alternating current power supply; the first circuit comprises a first energy storage unit and a voltage conversion circuit which are coupled in series; the first energy storage unit is coupled with a live wire end, and the voltage conversion circuit is coupled with a neutral wire end of an alternating current power supply; and
the second circuit is coupled with a neutral terminal of the alternating current power supply and is coupled with the first circuit; the second circuit comprises a second energy storage unit and a power switch circuit which are coupled in series; the second energy storage unit is coupled with a live wire end, and the power switch circuit is coupled with the voltage conversion circuit and the neutral wire end;
when the alternating current power supply is normal, the alternating current power supply supplies power to the load in a mains supply mode through the first circuit; when the alternating current power supply is abnormal, the second energy storage unit provides power supply in a battery mode for the load through the power switch circuit and the first circuit;
the voltage conversion circuit comprises a first transistor switch and a second transistor switch which are coupled in series, a first diode and a first capacitor which are coupled in series, and a second diode and a second capacitor which are coupled in series; wherein the first transistor switch is coupled to the first energy storage unit, the first diode and the second diode; the second transistor switch is coupled with the second circuit, the first capacitor and the second capacitor;
the power switch circuit comprises a third diode and a third transistor switch and a fourth transistor switch which are coupled in series; the third transistor switch is coupled with the second transistor switch, the first capacitor, the second capacitor and the neutral line terminal, and the fourth transistor switch is coupled with the second energy storage unit; one end of the third diode is coupled to the first diode and the first capacitor, and the other end of the third diode is coupled to the third transistor switch and the fourth transistor switch.
2. A dc-dc converter having bridgeless power factor correction function according to claim 1, characterized in that: when operating in the mains mode and when the dc-dc converter is operating in the positive half cycle: the first transistor switch is turned on, the second transistor switch is turned on, the third transistor switch is turned off, the fourth transistor switch is turned off, and the first energy storage unit is in energy storage operation; and the first transistor switch is turned off, the second transistor switch is turned off, the third transistor switch is turned off and the fourth transistor switch is turned off, and the first energy storage unit is operated by releasing energy.
3. A dc-dc converter having bridgeless power factor correction function according to claim 2, characterized in that: when the first energy storage unit is in energy storage operation, a first energy storage path is formed by the live wire end, the first energy storage unit, the first transistor switch, the second transistor switch and the neutral wire end; and when the first energy storage unit is in energy release operation, a first energy release path is formed by the live wire end, the first energy storage unit, the first diode, the first capacitor and the neutral wire end.
4. A dc-dc converter having bridgeless power factor correction function according to claim 1, characterized in that: when operating in the utility power mode and when the dc-dc converter is operating in the negative half cycle: the first transistor switch is turned on, the second transistor switch is turned on, the third transistor switch is turned off, the fourth transistor switch is turned off, and the first energy storage unit is in energy storage operation; and the first transistor switch is turned off, the second transistor switch is turned off, the third transistor switch is turned off and the fourth transistor switch is turned off, and the first energy storage unit is operated by releasing energy.
5. A dc-dc converter having bridgeless power factor correction function according to claim 4, characterized in that: when the first energy storage unit is in energy storage operation, a second energy storage path is formed by the neutral terminal, the second transistor switch, the first energy storage unit and the fire terminal; and when the first energy storage unit is in energy release operation, the neutral terminal, the second capacitor, the second diode, the first energy storage unit and the fire terminal form a second energy release path.
6. A dc-dc converter having bridgeless power factor correction function according to claim 1, characterized in that: when operating in battery mode and when the dc-dc converter is operating in positive half cycle: the first transistor switch is conducted, the second transistor switch is conducted, the third transistor switch is conducted, the fourth transistor switch is conducted, and the first energy storage unit is in energy storage operation; and the first transistor switch is turned on, the second transistor switch is turned on, the third transistor switch is turned off and the fourth transistor switch is turned on, and the first energy storage unit is operated by releasing energy.
7. A dc-dc converter having bridgeless power factor correction function according to claim 6, characterized in that: when the first energy storage unit is in energy storage operation, a third energy storage path is formed by the anode of the second energy storage unit, the fourth transistor switch, the third transistor switch, the second transistor switch, the first energy storage unit and the cathode of the second energy storage unit; and when the first energy storage unit is in energy releasing operation, the anode of the second energy storage unit, the fourth transistor switch, the third transistor switch, the first capacitor, the second transistor switch, the first energy storage unit and the cathode of the second energy storage unit form a third energy releasing path.
8. A dc-dc converter having bridgeless power factor correction function according to claim 1, characterized in that: when operating in battery mode and when the dc-dc converter is operating for negative half cycles: the first transistor switch is conducted, the second transistor switch is conducted, the third transistor switch is conducted, the fourth transistor switch is conducted, and the first energy storage unit is in energy storage operation; and the first transistor switch is turned off, the second transistor switch is turned off, the third transistor switch is turned on, the fourth transistor switch is turned on, and the first energy storage unit is operated by releasing energy.
9. A dc-dc converter having bridgeless power factor correction function according to claim 8, characterized in that: when the first energy storage unit is in energy storage operation, the anode of the second energy storage unit, the fourth transistor switch, the third transistor switch, the second transistor switch, the first energy storage unit and the cathode of the second energy storage unit form a fourth energy storage path; and when the first energy storage unit is in energy release operation, the anode of the second energy storage unit, the fourth transistor switch, the third transistor switch, the second capacitor, the second diode, the first energy storage unit and the cathode of the second energy storage unit form a fourth energy release path.
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