CN109104086B - DC-DC converter with power factor correction function - Google Patents
DC-DC converter with power factor correction function Download PDFInfo
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- CN109104086B CN109104086B CN201811308538.3A CN201811308538A CN109104086B CN 109104086 B CN109104086 B CN 109104086B CN 201811308538 A CN201811308538 A CN 201811308538A CN 109104086 B CN109104086 B CN 109104086B
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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
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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
- 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
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- 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 application discloses a direct current-to-direct current converter with a power factor correction function, and particularly relates to the technical field of converters. The converter comprises a first circuit, a second circuit and a third circuit, wherein the first circuit is coupled with a live wire end of an alternating current power supply; wherein the first power switch circuit is coupled with the fire wire end; a second circuit coupled to the neutral terminal of the ac power source and the line terminal of the first circuit; the second circuit comprises an energy storage unit and a second power switch circuit which are coupled in series; the energy storage unit is coupled with the live wire end and the first power switch circuit, and the second power switch circuit is coupled with the neutral wire end and the standby battery; the third circuit is coupled with the standby battery of the first circuit, the energy storage unit of the second circuit, the second power switch circuit and the neutral terminal; the application is applied to the uninterruptible power system through the improvement of the simplification of the circuit architecture, the reduction of the production cost, the improvement of the production efficiency and the purpose of portable use.
Description
Technical field:
the present application relates to a dc-dc converter, and more particularly, to a dc-dc converter with power factor correction.
The background technology is as follows:
currently, when a converter with a power factor correction (Power Factor Correction, PFC) function is applied to a battery mode under a 3kVA framework of a current uninterruptible power system (Uninterruptible Power System, UPS), a backup ac power source is continuously supplied to load devices such as an electric appliance under the condition of abnormal or power failure of a power grid, so as to maintain the normal operation of the electric appliance. In general, a continuous power-off system is used for maintaining continuous power supply of critical commercial equipment such as computers, servers and the like or precise instruments, and preventing data loss, communication interruption or device loss.
However, the most common application of the Uninterruptible Power Supply (UPS) is to use with a lead-acid battery when the UPS is operated in a battery mode under a 3kVA architecture, the lead-acid battery is large in size, short in service life, and time-consuming and cost-consuming in maintenance, and the conventional direct current-to-direct current (DC-to-DC) converter is a Push-Pull (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 and the processing time of the circuit board, and increases the volume and the cost of the uninterruptible power system due to the size of the lead-acid battery and the increase of the Push-Pull circuit framework.
Therefore, it is an important technical point of the present application to design an improved dc-dc converter, especially in the case of simplifying the circuit architecture, to solve the above-mentioned technical problems of increasing the volume and cost of the uninterruptible power supply system.
The application comprises the following steps:
to solve the problem of the increase of the volume and the cost of the uninterruptible power supply system; the application provides a direct current-to-direct current converter with a power factor correction function.
The application is used for supplying uninterrupted power in a mains supply mode or a battery mode to a load, and the direct current-to-direct current converter with the power factor correction function comprises a first circuit, a second circuit and a third circuit, wherein the first circuit is coupled with a live wire end of an alternating current power supply; the first circuit includes a first power switch circuit coupled in series and a backup battery; wherein the first power switch circuit is coupled with the fire wire end;
a second circuit coupled to the neutral terminal of the ac power source and the line terminal of the first circuit; the second circuit comprises an energy storage unit and a second power switch circuit which are coupled in series; the energy storage unit is coupled with the live wire end and the first power switch circuit, and the second power switch circuit is coupled with the neutral wire end and the standby battery;
the third circuit is coupled with the standby battery of the first circuit, the energy storage unit of the second circuit, the second power switch circuit and the neutral terminal;
when the alternating current power supply is normal, the alternating current power supply supplies power in a mains supply mode to the load through the second circuit and the third circuit; when the alternating current power supply is abnormal, the standby battery supplies power for the load in a battery mode through the first power switch circuit, the second circuit and the third circuit.
Preferably, the first power switching circuit includes a first diode and a first transistor switch coupled in series; the first diode is coupled to the fire wire end and the energy storage unit of the second circuit, and the first transistor switch is coupled to the backup battery.
Preferably, the second power switch circuit includes a fourth transistor switch and second and third transistor switches coupled in series; one end of the fourth transistor switch is coupled with the second transistor switch and the third transistor switch, and the other end of the fourth transistor switch is coupled with the backup battery and the third circuit; the second transistor switch is coupled to the energy storage unit and the third circuit, and the third transistor switch is coupled to the neutral line terminal.
Preferably, the third circuit includes a second diode, a third diode, a first capacitor, and a second capacitor coupled in series; the second diode is coupled to the fourth transistor of the second circuit and the standby battery of the first circuit, the third diode is coupled to the energy storage unit of the second circuit and the second transistor, and the first capacitor and the second capacitor are coupled to the neutral line terminal and the third transistor switch of the second circuit.
Preferably, when operating in the mains mode, and when the dc-dc converter is operated for a positive half cycle:
the first transistor switch is turned off, the second transistor switch is turned on, the third transistor switch is turned on, and the fourth transistor switch is turned off, and the energy storage unit is operated by energy storage; 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 energy storage unit is operated by releasing energy.
Preferably, when the energy storage unit is operated for energy storage, the fire wire end, the energy storage unit, the second transistor switch, the third transistor switch and the neutral wire end form a first energy storage path; and
when the energy storage unit is operated by releasing energy, the fire wire end, the energy storage unit, the third diode, the first capacitor and the neutral wire end form a first energy release path.
Preferably, when operating in the mains mode, and when the dc-dc converter is operated for a negative half cycle:
the first transistor switch is turned off, the second transistor switch is turned on, the third transistor switch is turned on, and the fourth transistor switch is turned off, and the energy storage unit is operated by energy storage; 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 energy storage unit is operated by releasing energy.
Preferably, when the energy storage unit is operated for energy storage, the neutral terminal, the third transistor switch, the second transistor switch, the energy storage unit and the live wire terminal form a second energy storage path; and
when the energy storage unit is operated by releasing energy, the neutral terminal, the second capacitor, the second diode, the fourth transistor switch, the second transistor switch, the energy storage unit and the live wire terminal form a second energy releasing path.
Preferably, when operating in battery mode, and when the dc-to-dc converter is operating for the positive half cycle:
the first transistor switch is turned on, the second transistor switch is turned on, the third transistor switch is turned on, and the fourth transistor switch is turned on, and the energy storage unit is operated by energy storage; and
the first transistor switch is turned on, the second transistor switch is turned off, the third transistor switch is turned on, and the fourth transistor switch is turned on, and the energy storage unit is operated by releasing energy.
Preferably, when the energy storage unit is operated for energy storage, the anode of the backup battery, the first transistor switch, the first diode, the energy storage unit, the second transistor switch, the fourth transistor switch and the cathode of the backup battery form a third energy storage path; and
when the energy storage unit is operated by releasing energy, the anode of the backup battery, the first transistor switch, the first diode, the energy storage unit, the third diode, the first capacitor, the third transistor switch, the fourth transistor switch and the cathode of the backup battery form a third energy release path.
Preferably, when operating in battery mode, and when the dc-to-dc converter is operated for the negative half cycle:
the first transistor switch is turned on, the second transistor switch is turned on, the third transistor switch is turned on, and the fourth transistor switch is turned on, and the energy storage unit is operated by energy storage; and
the first transistor switch is turned on, the second transistor switch is turned on, the third transistor switch is turned on, and the fourth transistor switch is turned off, and the energy storage unit is operated by releasing energy.
Preferably, when the energy storage unit is operated for energy storage, the anode of the backup battery, the first transistor switch, the first diode, the energy storage unit, the second transistor switch, the fourth transistor switch and the cathode of the backup battery form a fourth energy storage path; and
when the energy storage unit is operated by releasing energy, the anode of the backup battery, the first transistor switch, the first diode, the energy storage unit, the second transistor switch, the third transistor switch, the second capacitor, the second diode and the cathode of the backup battery form a fourth energy release path.
Preferably, the third circuit further comprises a fourth diode; one end of the fourth diode is coupled with the energy storage unit, the second transistor switch and the third diode, and the other end of the fourth diode is coupled with the second diode and the second capacitor.
Preferably, when operating in the mains mode, and when the dc-to-dc converter is operated for the negative half cycle:
the first transistor switch is turned off, the second transistor switch is turned on, the third transistor switch is turned on, and the fourth transistor switch is turned off, and the energy storage unit is operated by energy storage; 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 energy storage unit is operated by releasing energy.
Preferably, when the energy storage unit is operated for energy storage, the neutral terminal, the third transistor switch, the second transistor switch, the energy storage unit and the live terminal form a second energy storage path; and
when the energy storage unit is operated by releasing energy, the neutral terminal, the second capacitor, the fourth diode, the energy storage unit and the live wire terminal form a fifth energy releasing path.
Compared with the prior art, the application has the beneficial effects that:
1. when the converter is used, if the alternating current power supply is normal, the alternating current power supply supplies power in a mains supply mode to a load through a second circuit and a third circuit, wherein the second circuit and the third circuit can perform voltage conversion treatment (such as Boost) on the alternating current power supply and then supply the voltage to the load; if the alternating current power supply is abnormal (such as surge, undervoltage or power failure), the first power switch circuit of the first circuit and the second power switch circuit of the second circuit can be controlled by on-off of the circuits, so that the electric energy output by the backup battery can enter the second circuit and the third circuit through the first power switch circuit to perform voltage conversion treatment, and the backup battery can provide battery mode power for the load through the first power switch circuit, the second circuit and the third circuit. Therefore, when the alternating current power supply is abnormal, the standby battery can be subjected to voltage conversion processing through the second circuit and the third circuit by only the first power switch circuit, and the standby battery does not need to be additionally independent of other voltage conversion circuits (such as a Push-Pull converter) outside the flowing path of the alternating current power supply.
2. The application can reduce the substrate and the processing time of the circuit board by improving the simplification of the circuit architecture without occupying extra circuit board volume and wiring area, thereby solving the technical problems of increasing the volume and the cost of the uninterruptible power system and achieving the purposes of reducing the production cost, improving the production efficiency and being portable for use.
Description of the drawings:
for ease of illustration, the application is described in detail by the following detailed description and the accompanying drawings.
FIG. 1 is a schematic block diagram of the present application for use in an uninterruptible power system;
FIG. 2 is a schematic circuit diagram of a first embodiment of the present application;
FIG. 3 is a schematic diagram of a first energy storage path of the present application when operating in a mains mode and operating in a positive half cycle;
FIG. 4 is a schematic diagram of a first energy release path of the present application when the present application is operated in the mains mode and the positive half cycle operation;
FIG. 5 is a schematic diagram of a second energy storage path of the present application operating in a mains mode and operating in a negative half cycle;
FIG. 6 is a schematic diagram of a second energy release path of the present application when the present application is operated in the mains mode and the negative half cycle is operated;
FIG. 7 is a schematic diagram of a third energy storage path of the present application operating in battery mode and in positive half cycle operation;
FIG. 8 is a schematic diagram of a third energy release path of the present application when operating in battery mode and in positive half cycle operation;
FIG. 9 is a schematic diagram of a fourth energy storage path of the present application operating in battery mode and operating in the negative half cycle;
FIG. 10 is a schematic diagram of a fourth energy release path of the present application when operating in battery mode and operating in the negative half cycle;
FIG. 11 is a schematic diagram of a fifth energy release path of the present application when the present application is operated in the mains mode and the negative half cycle is operated.
The specific embodiment is as follows:
first embodiment:
referring to fig. 1 and 2, the dc-dc converter with pfc function applied to the uninterruptible power supply of the load 200 in the mains mode or the battery mode includes: the first circuit 10, the second circuit 20 and the third circuit 30, wherein the first circuit 10 is coupled to the live end L of the ac power supply; the first circuit 10 includes a first power switch circuit 11 and a backup battery 12 (shown as element B1, in this embodiment, a lithium battery) coupled in series; wherein the first power switch circuit 11 is coupled to the hot wire end. In detail, the first power switch circuit 11 includes a first diode D1 and a first transistor Q1 coupled in series; the first diode D1 is coupled to the first terminal L and the energy storage unit 21 (e.g., the inductor in the embodiment shown as the element L1) of the second circuit 20, and the first transistor Q1 is coupled to the backup battery B1.
The second circuit 20 is coupled to the neutral terminal N and the line terminal L of the ac power source, and the second circuit 20 is coupled to the first circuit 10; the second circuit 20 comprises an energy storage unit 21 and a second power switching circuit 22 coupled in series; the energy storage unit L1 is coupled to the first power switch circuit 11 and the second power switch circuit 22 is coupled to the neutral wire N and the backup battery B1. In detail, the second power switch circuit 22 includes a fourth transistor switch Q4, and a second transistor switch Q2 and a third transistor switch Q3 coupled in series; one end of the fourth transistor switch Q4 is coupled to the second transistor switch Q2 and the third transistor switch Q3, and the other end of the fourth transistor switch Q4 is coupled to the backup battery B1 and the third circuit 30; the second transistor switch Q2 is coupled to the energy storage unit L1 and the third circuit 30, and the third transistor switch Q3 is coupled to the neutral line terminal N.
The third circuit 30 is coupled to the first circuit 10, the second circuit 20 and the neutral terminal N; the third circuit 30 is coupled to the backup battery B1 of the first circuit 10, the energy storage unit L1 of the second circuit 20, and the second power switch circuit 22. In detail, the third circuit 30 includes a second diode D2, a third diode D3, a first capacitor C1, and a second capacitor C2 coupled in series; the second diode D2 is coupled to the fourth transistor Q4 of the second circuit 20 and the backup battery B1 of the first circuit 10, the third diode D3 is coupled to the energy storage unit L1 of the second circuit 20 and the second transistor Q2, and the first capacitor C1 and the second capacitor C2 are coupled to the neutral line terminal N and the third transistor Q3 of the second circuit 20.
Incidentally, the aforementioned transistor switches may be, for example, but not limited to, metal Oxide Semiconductor Field Effect Transistors (MOSFETs), bipolar Junction Transistors (BJTs), or Insulated Gate Bipolar Transistors (IGBTs).
In the embodiment of the application, the dc-dc converter with pfc is coupled to the input filter 300, which may be an EMI filter, for filtering electromagnetic interference (EMI) of the input ac power (as shown in fig. 1), and converts dc power output from the dc-dc converter with pfc by the coupling inverter 400, and filters noise such as electromagnetic interference output to the load 200 by the coupling output filter 500. Wherein, when the ac power is normal, the ac power supplies power to the load 200 in the mains mode through the second circuit 20 and the third circuit 30; when the ac power supply is abnormal, the backup battery B1 supplies the battery-mode power supply to the load 200 through the first power switch circuit 11, the second circuit 20, and the third circuit 30.
Further, referring to fig. 3 and 4, the dc-dc converter with the pfc function is operated in the mains mode (when the ac power is normal), and when the dc-dc converter is operated in the positive half cycle:
as shown in fig. 3, the energy storage unit L1 is operated by controlling the first transistor switch Q1 to be turned off, 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 off; when the energy storage unit L1 is operated for energy storage, the live wire end L, the energy storage unit L1, the second transistor switch Q2, the third transistor switch Q3 and the neutral wire end N form a first energy storage path Lns1 for storing energy of the energy storage unit L1; as shown in fig. 4, the energy storage unit L1 is operated 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; when the energy storage unit L1 is operated for releasing energy, the live wire end L, the energy storage unit L1, the third diode D3, the first capacitor C1 and the neutral wire end N form a first energy release path Lnr for releasing energy of the energy storage unit L1.
Further, referring to fig. 5 and 6, the dc-dc converter with the pfc function is operated in the mains mode (when the ac power is normal), and when the dc-dc converter is operated in the negative half cycle:
as shown in fig. 5, the energy storage unit L1 is operated by controlling the first transistor switch Q1 to be turned off, 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 off; when the energy storage unit L1 is operated for energy storage, the neutral terminal N, the third transistor switch Q3, the second transistor switch Q2, the energy storage unit L1 and the live wire terminal L form a second energy storage path Lns for storing energy in the energy storage unit L1.
As shown in fig. 6, the energy storage unit L1 is operated 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; when the energy storage unit L1 is operated by releasing energy, the neutral terminal N, the second capacitor C2, the second diode D2, the fourth transistor switch Q4, the second transistor switch Q2, the energy storage unit L1 and the live terminal L form a second energy release path Lnr for releasing energy of the energy storage unit L1. Incidentally, for the energy releasing operation of the energy storage unit L1, since the second transistor switch Q2 and the fourth transistor switch Q4 are in the off state, the second energy releasing path Lnr for releasing energy of the energy storage unit L1 is achieved through the freewheeling path provided by the reverse (parasitic) diode of the second transistor switch Q2 and the reverse (parasitic) diode of the fourth transistor switch Q4.
Further, referring to fig. 7 and 8, the dc-dc converter with the pfc function is operated in the battery mode (ac power is abnormal) and when the dc-dc converter is operated in the positive half cycle:
as shown in fig. 7, the energy storage unit L1 is operated 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; when the energy storage unit L1 is operated for energy storage, the positive electrode of the backup battery B1, the first transistor switch Q1, the first diode D1, the energy storage unit L1, the second transistor switch Q2, the fourth transistor switch Q4, and the negative electrode of the backup battery B1 form a third energy storage path Lns for storing energy in the energy storage unit L1.
As shown in fig. 8, the energy storage unit L1 is operated by controlling the first transistor switch Q1 to be turned on, 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; when the energy storage unit L1 is operated for releasing energy, the positive electrode of the backup battery B1, the first transistor Q1, the first diode D1, the energy storage unit L1, the third diode D3, the first capacitor C1, the third transistor Q3, the fourth transistor Q4 and the negative electrode of the backup battery B1 form a third energy release path Lnr for releasing energy from the energy storage unit L1.
Further, referring to fig. 9 and 10, the dc-dc converter with the pfc function is operated in the battery mode (ac power is abnormal) and when the dc-dc converter is operated in the negative half cycle:
as shown in fig. 9, the energy storage unit L1 is operated 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; when the energy storage unit L1 is operated for energy storage, the positive electrode of the backup battery B1, the first transistor switch Q1, the first diode D1, the energy storage unit L1, the second transistor switch Q2, the fourth transistor switch Q4, and the negative electrode of the backup battery B1 form a fourth energy storage path Lns for storing energy in the energy storage unit L1.
As shown in fig. 10, the energy storage unit L1 is operated 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 off; when the energy storage unit L1 is operated for releasing energy, the positive electrode of the backup battery B1, the first transistor switch Q1, the first diode D1, the energy storage unit L1, the second transistor switch Q2, the third transistor switch Q3, the second capacitor C2, the second diode D2 and the negative electrode of the backup battery B1 form a fourth energy release path Lnr for releasing energy of the energy storage unit L1.
Further, referring to fig. 11, a difference between the embodiment of fig. 6 and the embodiment of the present application is that a fourth diode D4 is added, one end of the fourth diode D4 is coupled to the energy storage unit L1, the second transistor Q2 and the third diode D3, and the other end of the fourth diode D4 is coupled to the second diode D2 and the second capacitor C2.
As shown in fig. 11, the energy storage unit L1 is operated 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; when the energy storage unit L1 is operated for releasing energy, the neutral terminal N, the second capacitor C2, the fourth diode D4, the energy storage unit L1 and the live terminal L form a fifth energy release path Lnr for releasing energy of the energy storage unit L1. Compared to the second energy release path Lnr shown in fig. 6, the fifth energy release path Lnr shown in fig. 11 avoids passing through the fourth transistor switch Q4 and the second transistor switch Q2 in the path, which can effectively reduce the conduction loss and the switching loss of the transistor switch, and the additional power consumption and the delay of the response time due to the influence of the parasitic resistance and the parasitic capacitance of the element, and can further improve the conversion efficiency, the circuit response and reduce the operation cost.
As described above, when the dc-dc converter with the power factor correction function of the present application is used, if the ac power supply is normal, the ac power supply supplies power in the mains mode to the load 200 through the second circuit 20 and the third circuit 30, wherein the second circuit 20 and the third circuit 30 may perform voltage conversion (e.g. boosting) on the ac power supply and then supply the voltage to the load; for example, the first power switch circuit 11 of the first circuit 10 and the second power switch circuit 22 of the second circuit 20 can be controlled to be turned on or off by the circuit, so that the electric energy output by the backup battery B1 can enter the second circuit 20 and the third circuit 30 through the first power switch circuit 11 to perform voltage conversion processing, and the backup battery B1 can provide battery-mode power for the load through the first power switch circuit 11, the second circuit 20 and the third circuit 30.
Therefore, when the ac power supply is abnormal, the standby battery B1 can be subjected to voltage conversion processing by the second circuit 20 and the third circuit 30 only through the first power switch circuit 11, and no additional voltage conversion circuit (such as a converter) independent of the flowing path of the ac power supply is needed.
In addition, the backup battery B1 of the present application is not a conventional lead-acid battery, but a lithium battery is used in combination, and the conventional lead-acid battery has the disadvantages of large volume, heavy weight and short service life.
Claims (13)
1. A dc-dc converter with a power factor correction function, for providing a load with uninterruptible power in a mains mode or a battery mode, characterized in that: the power supply comprises a first circuit, a second circuit and a third circuit, wherein the first circuit is coupled with a live wire end of an alternating current power supply; the first circuit includes a first power switch circuit coupled in series and a backup battery; wherein the first power switch circuit is coupled with the fire wire end;
a second circuit coupled to the neutral terminal of the ac power source and the line terminal of the first circuit; the second circuit comprises an energy storage unit and a second power switch circuit which are coupled in series; the energy storage unit is coupled with the live wire end and the first power switch circuit, and the second power switch circuit is coupled with the neutral wire end and the standby battery;
the third circuit is coupled with the standby battery of the first circuit, the energy storage unit of the second circuit, the second power switch circuit and the neutral terminal;
when the alternating current power supply is normal, the alternating current power supply supplies power in a mains supply mode to the load through the second circuit and the third circuit; when the alternating current power supply is abnormal, the standby battery supplies power in a battery mode to the load through the first power switch circuit, the second circuit and the third circuit;
the first power switch circuit comprises a first diode and a first transistor switch which are coupled in series; the first diode is coupled with the fire wire end and the energy storage unit of the second circuit, and the first transistor switch is coupled with the backup battery;
the second power switch circuit comprises a fourth transistor switch, a second transistor switch and a third transistor switch which are coupled in series; one end of the fourth transistor switch is coupled with the second transistor switch and the third transistor switch, and the other end of the fourth transistor switch is coupled with the backup battery and the third circuit; the second transistor switch is coupled to the energy storage unit and the third circuit, and the third transistor switch is coupled to the neutral line terminal.
2. The dc-dc converter with power factor correction function according to claim 1, wherein: the third circuit comprises a second diode, a third diode, a first capacitor and a second capacitor which are coupled in series; one end of the second diode is coupled with the fourth transistor of the second circuit and the standby battery of the first circuit, one end of the third diode is coupled with the energy storage unit of the second circuit and the second transistor, one end of the first capacitor and one end of the second capacitor are coupled with the neutral line end and the third transistor switch of the second circuit, the other end of the second diode is connected with the other end of the second capacitor, and the other end of the third diode is connected with the other end of the first capacitor.
3. A dc-dc converter with power factor correction according to claim 2, characterized in that: when operating in the mains mode and when the dc-dc converter is operated for a positive half cycle:
the first transistor switch is turned off, the second transistor switch is turned on, the third transistor switch is turned on, and the fourth transistor switch is turned off, and the energy storage unit is operated by energy storage; 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 energy storage unit is operated by releasing energy.
4. A dc-dc converter with power factor correction according to claim 3, characterized in that: when the energy storage unit is operated for energy storage, the fire wire end, the energy storage unit, the second transistor switch, the third transistor switch and the neutral wire end form a first energy storage path; and
when the energy storage unit is operated by releasing energy, the fire wire end, the energy storage unit, the third diode, the first capacitor and the neutral wire end form a first energy release path.
5. A dc-dc converter with power factor correction according to claim 2, characterized in that: when operating in the mains mode and when the dc-dc converter is operated for a negative half cycle:
the first transistor switch is turned off, the second transistor switch is turned on, the third transistor switch is turned on, and the fourth transistor switch is turned off, and the energy storage unit is operated by energy storage; 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 energy storage unit is operated by releasing energy.
6. The dc-dc converter with power factor correction according to claim 5, wherein: when the energy storage unit is operated for energy storage, the neutral terminal, the third transistor switch, the second transistor switch, the energy storage unit and the live wire terminal form a second energy storage path; and
when the energy storage unit is operated by releasing energy, the neutral terminal, the second capacitor, the second diode, the fourth transistor switch, the second transistor switch, the energy storage unit and the live wire terminal form a second energy releasing path.
7. A dc-dc converter with power factor correction according to claim 2, characterized in that: when operating in battery mode, and when the dc-to-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 on, and the fourth transistor switch is turned on, and the energy storage unit is operated by energy storage; and
the first transistor switch is turned on, the second transistor switch is turned off, the third transistor switch is turned on, and the fourth transistor switch is turned on, and the energy storage unit is operated by releasing energy.
8. The dc-dc converter with power factor correction function according to claim 7, wherein: when the energy storage unit is in energy storage operation, the anode of the backup battery, the first transistor switch, the first diode, the energy storage unit, the second transistor switch, the fourth transistor switch and the cathode of the backup battery form a third energy storage path; and
when the energy storage unit is operated by releasing energy, the anode of the backup battery, the first transistor switch, the first diode, the energy storage unit, the third diode, the first capacitor, the third transistor switch, the fourth transistor switch and the cathode of the backup battery form a third energy release path.
9. A dc-dc converter with power factor correction according to claim 2, characterized in that: when operating in battery mode, and when the dc-to-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 on, and the fourth transistor switch is turned on, and the energy storage unit is operated by energy storage; and
the first transistor switch is turned on, the second transistor switch is turned on, the third transistor switch is turned on, and the fourth transistor switch is turned off, and the energy storage unit is operated by releasing energy.
10. The dc-dc converter with power factor correction function according to claim 9, wherein: when the energy storage unit is in energy storage operation, the anode of the backup battery, the first transistor switch, the first diode, the energy storage unit, the second transistor switch, the fourth transistor switch and the cathode of the backup battery form a fourth energy storage path; and
when the energy storage unit is operated by releasing energy, the anode of the backup battery, the first transistor switch, the first diode, the energy storage unit, the second transistor switch, the third transistor switch, the second capacitor, the second diode and the cathode of the backup battery form a fourth energy release path.
11. A dc-dc converter with power factor correction according to claim 2, characterized in that: the third circuit further includes a fourth diode; one end of the fourth diode is coupled with the energy storage unit, the second transistor switch and the third diode, and the other end of the fourth diode is coupled with the second diode and the second capacitor.
12. The dc-dc converter with power factor correction according to claim 11, wherein: when operating in the mains mode, and when the dc-dc converter is operated for the negative half cycle:
the first transistor switch is turned off, the second transistor switch is turned on, the third transistor switch is turned on, and the fourth transistor switch is turned off, and the energy storage unit is operated by energy storage; 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 energy storage unit is operated by releasing energy.
13. The dc-dc converter with power factor correction according to claim 11, wherein: when the energy storage unit is operated for energy storage, the neutral terminal, the third transistor switch, the second transistor switch, the energy storage unit and the live wire end form a second energy storage path; and
when the energy storage unit is operated by releasing energy, the neutral terminal, the second capacitor, the fourth diode, the energy storage unit and the live wire terminal form a fifth energy releasing path.
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| US5737204A (en) * | 1995-10-12 | 1998-04-07 | Dell U.S.A. L.P. | Method and apparatus for interfacing battery backup to power factor correction front end for maintaining power |
| CN202565158U (en) * | 2012-05-10 | 2012-11-28 | 山西晋城无烟煤矿业集团有限责任公司 | Explosion suppression and intrinsic safety switch power with power factor correction |
| CN104638688A (en) * | 2013-11-07 | 2015-05-20 | 艾默生网络能源有限公司 | Single-phase uninterrupted power supply circuit and three-phase uninterrupted power supply circuit |
| CN105529941A (en) * | 2014-09-29 | 2016-04-27 | 力博特公司 | PFC rectifier and uninterrupted power source |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1153331C (en) * | 2002-02-01 | 2004-06-09 | 艾默生网络能源有限公司 | Power factor corrector for UPS |
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|---|---|---|---|---|
| US5737204A (en) * | 1995-10-12 | 1998-04-07 | Dell U.S.A. L.P. | Method and apparatus for interfacing battery backup to power factor correction front end for maintaining power |
| CN202565158U (en) * | 2012-05-10 | 2012-11-28 | 山西晋城无烟煤矿业集团有限责任公司 | Explosion suppression and intrinsic safety switch power with power factor correction |
| CN104638688A (en) * | 2013-11-07 | 2015-05-20 | 艾默生网络能源有限公司 | Single-phase uninterrupted power supply circuit and three-phase uninterrupted power supply circuit |
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