CN107785987B - Online uninterrupted power supply - Google Patents
Online uninterrupted power supply Download PDFInfo
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- CN107785987B CN107785987B CN201610726454.6A CN201610726454A CN107785987B CN 107785987 B CN107785987 B CN 107785987B CN 201610726454 A CN201610726454 A CN 201610726454A CN 107785987 B CN107785987 B CN 107785987B
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- switching tube
- direct current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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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
- H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
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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
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Rectifiers (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides an online uninterrupted power supply, which comprises a power factor correction circuit connected with an alternating current input end; the input end of the rectifying circuit is coupled to the power factor correction circuit; a bi-directional DC-DC converter having a low voltage side for connection to a rechargeable battery and a high voltage side for connection to a charging capacitor; and a switching device for selectively enabling two ends of the charging capacitor to be connected to the output end of the rectifying circuit or coupled to the power factor correction circuit. The on-line uninterrupted power supply saves components and reduces the cost.
Description
Technical Field
The invention relates to an uninterruptible power supply, in particular to an online uninterruptible power supply.
Background
On-line uninterruptible power supplies, which are capable of continuously powering loads, have been widely used in various fields.
Fig. 1 is a circuit diagram of an in-line uninterruptible power supply in the prior art. The in-line uninterruptible power supply 1 comprises a safety switch 12, a power factor correction circuit (PFC) 13, a half-bridge inverter 14 and a bypass switch 17 which are connected in sequence between an ac input 10 and an ac output 11, wherein the output of the PFC13 is connected to the input of the half-bridge inverter 14 and acts as a dc bus, and the bypass switch 17 is used to connect one of the output of the half-bridge inverter 14 and the input of the PFC13 to the ac output 11. The online uninterruptible power supply 1 further comprises a charger 15 and a push-pull circuit 16 which are sequentially connected, wherein the input end of the charger 15 is connected to the alternating current input end 10, the output end of the charger 15 and the input end of the push-pull circuit 16 are both connected to two ends of a rechargeable battery 18, and the output end of the push-pull circuit 16 is connected to a direct current bus.
The on-line ups 1 of fig. 1 has the following 4 modes of operation.
On-line mode: the safety switch 12 is controlled to be in a conductive state, the bypass switch 17 is controlled so that the output terminal of the half-bridge inverter 14 is connected to the ac output terminal 11, the PFC13, the half-bridge inverter 14 and the charger 15 are controlled to be in an operating state, the utility power (ac) of the ac input terminal 10 supplies power to a load (not shown in fig. 1) connected to the ac output terminal 11 through the safety switch 12, the PFC13 and the half-bridge inverter 14, and the charger 15 charges a rechargeable battery 18 at the output terminal thereof.
Battery mode: the safety switch 12 is controlled to be in an off state, the bypass switch 17 is controlled so that the output terminal of the half-bridge inverter 14 is connected to the ac output terminal 11, the push-pull circuit 16 and the half-bridge inverter 14 are controlled to be in an operating state, and the rechargeable battery 18 supplies power to the load through the push-pull circuit 16 and the half-bridge inverter 14.
Economic mode of operation (ECO): the safety switch 12 is controlled to be in a conductive state, the bypass switch 17 is controlled so that the input terminal of the PFC13 is connected to the ac output terminal 11, and the PFC13 and the charger 15 are controlled to be in an operating state.
Bypass mode: the safety switch 12 is controlled to be in a conductive state, the bypass switch 17 is controlled so that the input terminal of the PFC13 is connected to the ac output terminal 11, and the charger 15 is controlled to be in an operating state.
The PFC13, the half-bridge inverter 14, the charger 15 and the push-pull circuit 16 in the in-line uninterruptible power supply 1 of fig. 1 operate as independent circuit modules in corresponding operation modes, so that the utilization rate of electronic devices in the in-line uninterruptible power supply 1 is low, resulting in a larger number of electronic devices and higher cost.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, the embodiment of the invention provides an online uninterrupted power supply, which comprises:
a power factor correction circuit connected with the alternating current input end;
the input end of the rectifying circuit is coupled to the power factor correction circuit;
a bi-directional DC-DC converter having a low voltage side for connection to a rechargeable battery and a high voltage side for connection to a charging capacitor; and
and the switching device is used for selectively enabling two ends of the charging capacitor to be connected to the output end of the rectifying circuit or coupled to the power factor correction circuit.
Preferably, the online uninterruptible power supply further comprises a first switching tube connected between the positive output terminal of the rectifying circuit and the switching device.
Preferably, the bidirectional DC-DC converter includes: the switching device comprises a first inductor, a second switching tube with a first anti-parallel diode and a third switching tube with a second anti-parallel diode, wherein the first inductor, the second switching tube and the second anti-parallel diode are connected to form a Boost circuit, and the third switching tube, the first anti-parallel diode and the first inductor are connected to form a Buck step-down circuit.
Preferably, the bidirectional DC-DC converter includes: the high-voltage power supply comprises a first inductor, a first diode, a second switching tube with an anti-parallel diode and a third switching tube which is in anti-parallel connection with the first diode, wherein the first inductor, the first diode and the second switching tube are connected to form a Boost circuit, and the third switching tube, the anti-parallel diode and the first inductor are connected to form a Buck step-down circuit.
Preferably, the power factor correction circuit includes: a second inductor; a first direct current boost circuit having the second inductance and outputting a forward voltage; and a second direct current boost circuit having the second inductance and outputting a negative voltage; the output ends of the first direct current booster circuit and the second direct current booster circuit are connected in series.
Preferably, the second inductor has one end connected to the ac input terminal and the other end; the first direct-current boost circuit further comprises a second diode, a third diode, a fourth switching tube and a positive direct-current bus capacitor; the second direct-current boost circuit further comprises a fourth diode, a fifth switching tube and a negative direct-current bus capacitor; the fifth switching tube is connected with the fourth diode and the fifth diode to form a first node, and the positive direct current bus capacitor and the negative direct current bus capacitor are connected to form a second node.
Preferably, the input terminal of the rectifying circuit is connected to the other terminal of the second inductor and the second node, and the switching device is configured to selectively connect both ends of the charging capacitor to the output terminal of the rectifying circuit or to the one terminal of the second inductor and the first node.
Preferably, the online uninterruptible power supply further comprises an inverter, and an input end of the inverter is connected to an output end of the power factor correction circuit.
Preferably, the online uninterruptible power supply further comprises a control device for controlling the working states of the power factor correction circuit, the bidirectional DC-DC converter and the switching device.
Preferably, in the on-line mode, the control device is configured to control the switching device so that two ends of the charging capacitor are connected to the output end of the rectifying circuit, control the power factor correction circuit to operate to alternately output a positive DC bus voltage and a negative DC bus voltage, and control the bidirectional DC-DC converter to operate to charge the rechargeable battery by using the direct current on the charging capacitor.
Preferably, the online uninterruptible power supply further comprises a control device for controlling the working states of the power factor correction circuit, the bidirectional DC-DC converter, the switching device and the first switching tube.
Preferably, in the on-line mode, the control device is configured to control the switching device so that two ends of the charging capacitor are connected to the output end of the rectifying circuit, control the power factor correction circuit to operate to alternately output a positive DC bus voltage and a negative DC bus voltage, control the first switching tube so that the voltage on the charging capacitor is a predetermined threshold voltage, and control the bidirectional DC-DC converter to operate to charge the rechargeable battery by using the direct current on the charging capacitor.
Preferably, in the battery mode, the control device is further configured to control the switching device so that two ends of the charging capacitor are coupled to the power factor correction circuit, control the bidirectional DC-DC converter to operate to charge the charging capacitor with direct current on the rechargeable battery, and control the power factor correction circuit to operate to charge the positive DC bus and the negative DC bus with direct current on the charging capacitor.
The online uninterrupted power supply of the invention does not have a transformer with large volume and high cost, and meanwhile, the components are reused, so that the number of the components is reduced, and the cost is obviously reduced.
Drawings
Embodiments of the invention are further described below with reference to the accompanying drawings, in which:
fig. 1 is a circuit diagram of an in-line uninterruptible power supply in the prior art.
Fig. 2 is a circuit diagram of an in-line uninterruptible power supply according to a first embodiment of the invention.
Fig. 3 is an equivalent circuit diagram of the online ups shown in fig. 2 in online mode.
Fig. 4 is an equivalent circuit diagram of the on-line ups shown in fig. 2 in battery mode.
Fig. 5 is a circuit diagram of an in-line uninterruptible power supply according to a second embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail by the following examples with reference to the accompanying drawings.
Fig. 2 is a circuit diagram of an in-line uninterruptible power supply according to a first embodiment of the invention. As shown in fig. 2, the in-line uninterruptible power supply 2 includes a safety switch 22, a PFC 23, and a half-bridge inverter 24 connected in sequence between an ac input terminal 20 and an ac output terminal 21, wherein an input terminal of the PFC 23 is connected to the ac input terminal 20 through the safety switch 22, and an output terminal thereof is connected to an input terminal of the half-bridge inverter 24. The in-line uninterruptible power supply 2 further comprises a full-bridge rectifier circuit 29 coupled to the power factor correction circuit 23, a switching device 26 and a bi-directional DC-DC converter 25. The low voltage side of the bi-directional DC-DC converter 25 is connected to the rechargeable battery 28 and the high voltage side thereof is connected to both ends of the charging capacitor C22.
The in-line uninterruptible power supply 2 further comprises a control means 200 for controlling the operation of the PFC 23, the half-bridge inverter 24, the switching means 26 and the bi-directional DC-DC converter 25.
The advantages will be described below in connection with the mode of operation of the on-line ups 2.
Fig. 3 is an equivalent circuit diagram of the online ups shown in fig. 2 in online mode. The safety switch 22 is in the on state, the bypass switch 27 connects the output of the half-bridge inverter 24 to the ac output 21, and the control device 200 controls the switches RY8, RY9 in the switching device 26 such that the high voltage side of the bi-directional DC-DC converter 25 (i.e. across the charging capacitor C22) is connected to the output of the full-bridge rectifier circuit 29.
As shown in fig. 3, PFC 23 is a PFC of the prior art, and includes an inductor L6, diodes D9, D10, D11, D12, switching transistors Q10, Q11, a positive dc bus capacitor C13, and a negative dc bus capacitor C17, wherein the switching transistor Q11 is connected to an anode of the diode D11 and a cathode of the diode D12 to form a node N3, a node N4 formed by connecting the positive dc bus capacitor C13 and the negative dc bus capacitor C17 in series (or connecting the switching transistors Q10 and Q11) and one end N1 of the inductor L6 are used as an input terminal of the PFC 23, and an input terminal of the full bridge rectifier 29 is connected to the other end N2 of the inductor L6 and the node N4.
In the positive half cycle of the mains (ac) supply of the ac input 20, the inductor L6, the diode D10, the diode D9, the switching tube Q10, and the positive dc bus capacitor C13 in the PFC 23 are connected to form a first dc Boost circuit substantially identical to the Boost circuit. When the switching tube Q10 is conducted, the inductor L6, the diode D10 and the switching tube Q11 form a conducting path, so that the inductor L6 stores energy; when the switching tube Q10 is turned off, a part of energy in the inductor L6 charges the positive dc bus capacitor C13 through the diode D10 and the diode D9, and another part of energy charges the charging capacitor C22 through the full-bridge rectifier circuit 29 and the switching device 26. While controlling the operation of the half-bridge inverter 24 to obtain the positive half cycle of the alternating current at the alternating current output 21.
In the negative half cycle of the mains supply at the ac input 20, the inductor L6, the diode D11, the diode D12, the switching tube Q11, and the negative dc bus capacitor C17 in the PFC 23 are connected to form a second dc Boost circuit substantially identical to the Boost circuit. When the switching tube Q11 is conducted, the switching tube Q11, the diode D11 and the inductor L6 form a conductive path so that the inductor L6 stores energy; when the switching tube Q11 is turned off, a part of the energy in the inductance L6 charges the negative dc bus capacitor C17 through the diode D12 and the diode D11, while another part of the energy charges the charging capacitor C22 through the full-bridge rectifier circuit 29 and the switching device 26. While controlling the operation of the half-bridge inverter 24 to obtain the negative half-cycle of the alternating current at the alternating current output 21.
According to the above working principle, the inductor L6, diodes D10 and D11, and switching tubes Q10 and Q11 in the PFC 23 are reused to charge the charging capacitor C22, so that components are saved and cost is reduced.
The charging function of the bidirectional DC-DC converter 25 will be described below in connection with its circuit configuration and operation. Referring again to fig. 3, the bi-directional DC-DC converter 25 includes an inductor L8, a switching tube Q14, a switching tube Q16 with an anti-parallel diode D16, and a diode D15. During the process of charging the charging capacitor C22, the switching tube Q16 is controlled to be turned off, and the switching tube Q14, the inductor L8 and the diode D16 form a Buck step-down circuit. The control switch Q14 operates in a pulse width modulated manner to charge the rechargeable battery 28 with dc power on the charge capacitor C22. Since the charging process of the rechargeable battery 28 is controllable, the total harmonic current distortion rate and the power factor can be improved during the charging process.
Fig. 4 is an equivalent circuit diagram of the on-line ups shown in fig. 2 in battery mode. The safety switch 22 is controlled to be in an off state, the bypass switch 27 is such that the output of the half-bridge inverter 24 is connected to the ac output 21, and the control device 200 controls the switches RY8, RY9 in the switching device 26 such that the high voltage side of the bidirectional DC-DC converter 25 (i.e. both ends of the charging capacitor C22) is connected to one end N1 of the inductance L6 and the node N3.
In the first stage Boost control, the control device 200 controls the switching tube Q14 to be turned off, and the inductor L8, the switching tube Q16 and the diode D15 in the bidirectional DC-DC converter 25 form a Boost circuit. The control switch Q16 operates in a pulse width modulated manner to charge the charge capacitor C22 with dc power on the rechargeable battery 28.
In the second-stage boost control process, the following two steps are alternately performed:
(1) The switching tube Q11 is controlled to be turned on, and at this time, the inductor L6, the diode D10, the diode D9, the switching tube Q10 and the positive dc bus capacitor C13 are equivalent to a dc Boost circuit substantially identical to the Boost circuit, and two ends of the charging capacitor C22 are connected to an input end of the dc Boost circuit (i.e., one end N1 and a node N3 of the inductor L6) through the switches RY8 and RY9 and the turned-on switching tube Q11. When the switching tube Q10 is conducted, the inductor L6, the diode D10, the switching tube Q10 and the switching tube Q11 form a conducting path, so that the inductor L6 stores energy; when the switching tube Q10 is turned off, the inductor L6, the diode D10, the diode D9, the positive direct current bus capacitor C13 and the switching tube Q11 form another conductive path, so that the positive direct current bus capacitor C13 is charged. While controlling the operation of the half-bridge inverter 24 to obtain the positive half cycle of the alternating current at the alternating current output 21.
(2) The control switch Q10 is turned on, where the inductor L6, the diode D10, the turned-on switch Q10, the switch Q11, the negative dc bus capacitor C17 and the diode D12 may be equivalent to another dc Boost circuit substantially the same as the Boost circuit, and two ends of the charging capacitor C22 are connected to the input end of the dc Boost circuit (i.e. one end N1 and the node N3 of the inductor L6) through the switches RY8 and RY 9. When the switching tube Q11 is conducted, the inductor L6, the diode D10, the switching tube Q10 and the switching tube Q11 form a conducting path, so that the inductor L6 stores energy; when the switching tube Q11 is turned off, the inductor L6, the diode D10, the switching tube Q10, the negative direct current bus capacitor C17 and the diode D12 form another conductive path, so that the negative direct current bus capacitor C17 is charged. While controlling the operation of the half-bridge inverter 24 to obtain the negative half cycle of the alternating current at the alternating current output 21.
In the battery mode, in addition to alternately charging the positive and negative dc buses according to the control method described above, the positive and negative dc buses can be charged simultaneously by supplying the same pulse width modulation signals to the switching transistors Q10 and Q11 in the power factor correction circuit 23. The specific control principle is as follows: when the control switch tubes Q10 and Q11 are both conducted, the inductor L6, the diode D10, the switch tube Q10 and the switch tube Q11 form a conducting path, so that the inductor L6 stores energy; when the control switch tubes Q10 and Q11 are turned off, the inductor L6, the diode D10, the diode D9, the positive direct current bus capacitor C13, the negative direct current bus capacitor C17 and the diode D12 form another conductive path, so that the positive direct current bus capacitor C13 and the negative direct current bus capacitor C17 are charged simultaneously.
In the battery mode, the dc power from the rechargeable battery 28 is boosted in the first stage and stored in the charging capacitor C22, and the dc power from the charging capacitor C22 is boosted in the second stage and stored in the positive dc bus capacitor C13 and the negative dc bus capacitor C17. The two-stage boosting reduces the boosting ratio of each stage, thereby being beneficial to improving the efficiency and reducing the cost of devices. In addition, part of components in the PFC 23 are recycled in the second stage boosting process, so that the components are saved, and the cost is reduced.
Economic mode of operation of the online ups 2: the safety switch 22 is in a conducting state, the bypass switch 27 is controlled to enable the input end of the PFC 23 to be connected to the alternating current output end 21, the switching device 26 is controlled to enable the output end of the full-bridge rectifying circuit 29 to be connected to two ends of the charging capacitor C22, the PFC 23 is controlled to work, and meanwhile the bidirectional DC-DC converter 25 is controlled to work to charge the rechargeable battery 28.
Bypass mode of the in-line uninterruptible power supply 2: the safety switch 22 is in a conductive state, the bypass switch 27 is controlled such that the input terminal of the PFC 23 is connected to the ac output terminal 21, the switching device 26 is controlled such that the output terminal of the full-bridge rectifying circuit 29 is connected to both ends of the charging capacitor C22, and the bidirectional DC-DC converter 25 is controlled to operate to charge the rechargeable battery 28.
Fig. 5 is a circuit diagram of an in-line uninterruptible power supply according to a second embodiment of the invention. Which is substantially identical to fig. 2, except that the in-line uninterruptible power supply 3 further comprises a switching tube Q12 connected between the positive output terminal of the full-bridge rectifier circuit 29 and the switching means 26.
The online ups 3 is substantially the same as the online mode, the economy running mode, and the bypass mode of the online ups 2, except that the control device 300 controls the operating state of the switching tube Q12 so that the voltage on the charging capacitor C22 is a predetermined threshold voltage. In this embodiment, the threshold voltage is greater than the voltage across the rechargeable battery 28 and less than the positive dc bus voltage on the positive dc bus capacitor C13 or the negative dc bus voltage on the negative dc bus capacitor C17, such as 100 volts or 150 volts. In a specific control manner, in the positive half cycle of the commercial power of the ac input terminal 20, when the control device 300 controls the switching tube Q10 to be turned off, the control device 300 controls the switching tube Q12 to be turned on so that the energy in the inductor L6 charges the charging capacitor C22 to reach the threshold voltage. In the negative half cycle of the mains supply of the ac input terminal 20, when the control device 300 controls the switching tube Q11 to be turned off, the control device 300 controls the switching tube Q12 to be turned on so that the energy in the inductor L6 charges the charging capacitor C22 to reach the threshold voltage. The required low voltage can be obtained on the charging capacitor C22 by controlling the working state of the switching tube Q12, so that the charging capacitor C22 with a lower rated voltage value can be selected, and the cost is reduced. In addition, the duty ratio of the switching tube Q14 can be increased during the charging process of the rechargeable battery 28, the switching loss can be reduced, and the conversion efficiency can be increased.
The battery mode of the online ups 3 is the same as that of the online ups 2, and will not be described here again.
The online uninterrupted power supply of the invention does not have a transformer with large volume and high cost, and meanwhile, the components are reused, so that the number of the components is reduced, and the cost is obviously reduced.
In the above embodiment of the present invention, the discrete diode D15 is connected in anti-parallel with the switching tube Q14, so that the switching tube Q14 with smaller specification and lower price can be selected. In other embodiments of the invention, a switching tube with an antiparallel diode may also be used instead of diode D15 and switching tube Q14 in the above embodiments.
In another embodiment of the present invention, other rectifying circuits may be employed instead of the full-bridge rectifying circuit 29 in the above embodiment.
In other embodiments of the present invention, other inverters may be employed in place of the half-bridge inverter 24 in the embodiments described above.
While the invention has been described in terms of preferred embodiments, the invention is not limited to the embodiments described herein, but encompasses various changes and modifications that may be made without departing from the scope of the invention.
Claims (16)
1. An on-line uninterruptible power supply, comprising:
a safety switch for selectively shutting off power from an ac input and a bypass switch for selectively outputting power from the ac input directly via a bypass branch;
a power factor correction circuit connected to the ac input via the safety switch;
the input end of the rectifying circuit is coupled to the power factor correction circuit;
a bi-directional DC-DC converter having a low voltage side for connection to a rechargeable battery and a high voltage side for connection to a charging capacitor; and
and the switching device is used for selectively enabling two ends of the charging capacitor to be connected to the output end of the rectifying circuit or coupled to the power factor correction circuit.
2. The on-line uninterruptible power supply of claim 1, further comprising a first switching tube connected between a positive output terminal of the rectifying circuit and the switching device.
3. The online uninterruptible power supply of claim 1 or 2, wherein the bidirectional DC-DC converter comprises: the switching device comprises a first inductor, a second switching tube with a first anti-parallel diode and a third switching tube with a second anti-parallel diode, wherein the first inductor, the second switching tube and the second anti-parallel diode are connected to form a Boost circuit, and the third switching tube, the first anti-parallel diode and the first inductor are connected to form a Buck step-down circuit.
4. The online uninterruptible power supply of claim 1 or 2, wherein the bidirectional DC-DC converter comprises: the high-voltage power supply comprises a first inductor, a first diode, a second switching tube with an anti-parallel diode and a third switching tube which is in anti-parallel connection with the first diode, wherein the first inductor, the first diode and the second switching tube are connected to form a Boost circuit, and the third switching tube, the anti-parallel diode and the first inductor are connected to form a Buck step-down circuit.
5. The online uninterruptible power supply of claim 1 or 2, wherein the power factor correction circuit comprises:
a second inductor;
a first direct current boost circuit having the second inductance and outputting a forward voltage; and
a second direct current boost circuit having the second inductance and outputting a negative voltage;
the output ends of the first direct current booster circuit and the second direct current booster circuit are connected in series.
6. The online uninterruptible power supply of claim 5, wherein,
the second inductor is provided with one end connected with the alternating current input end and the other end;
the first direct-current boost circuit further comprises a second diode, a third diode, a fourth switching tube and a positive direct-current bus capacitor;
the second direct-current boost circuit further comprises a fourth diode, a fifth switching tube and a negative direct-current bus capacitor;
the fifth switching tube is connected with the fourth diode and the fifth diode to form a first node, and the positive direct current bus capacitor and the negative direct current bus capacitor are connected to form a second node.
7. The in-line uninterruptible power supply of claim 6, wherein an input of the rectifying circuit is connected to the other end of the second inductor and the second node, and the switching means is configured to selectively connect both ends of the charging capacitor to an output of the rectifying circuit or to the one end of the second inductor and the first node.
8. The in-line uninterruptible power supply of claim 1 or 2, further comprising an inverter, an input of which is connected to an output of the power factor correction circuit.
9. The in-line uninterruptible power supply of claim 1, further comprising control means for controlling the operating states of the power factor correction circuit, the bidirectional DC-DC converter and the switching means.
10. The on-line uninterruptible power supply of claim 9, wherein in an on-line mode, the control means is configured to control the switching means such that both ends of the charging capacitor are connected to the output terminals of the rectifying circuit, to control the power factor correction circuit to operate to alternately output a positive DC bus voltage and a negative DC bus voltage, and to control the bidirectional DC-DC converter to operate to charge the rechargeable battery with direct current on the charging capacitor.
11. The in-line uninterruptible power supply of claim 2, further comprising control means for controlling the operating states of the power factor correction circuit, the bidirectional DC-DC converter, the switching means and the first switching tube.
12. The on-line uninterruptible power supply of claim 11, wherein in an on-line mode, the control means is configured to control the switching means such that both ends of the charging capacitor are connected to the output terminals of the rectifying circuit, control the power factor correction circuit to operate to alternately output a positive DC bus voltage and a negative DC bus voltage, control the first switching tube such that the voltage on the charging capacitor is a predetermined threshold voltage, and control the bidirectional DC-DC converter to operate to charge the rechargeable battery with direct current on the charging capacitor.
13. The in-line uninterruptible power supply of claim 9 or 11, wherein in battery mode the control means is further adapted to control the switching means such that both ends of the charging capacitor are coupled to the power factor correction circuit, to control the bi-directional DC-DC converter to operate to charge the charging capacitor with direct current on the rechargeable battery, and to control the power factor correction circuit to operate to charge positive and negative DC buses with direct current on the charging capacitor.
14. A control method for the online uninterruptible power supply of claim 1, wherein the control method comprises: and controlling the switching device to enable two ends of the charging capacitor to be connected to the output end of the rectifying circuit, controlling the power factor correction circuit to work to alternately output positive DC bus voltage and negative DC bus voltage, and simultaneously controlling the bidirectional DC-DC converter to work to charge the rechargeable battery by utilizing the DC on the charging capacitor.
15. A control method for the online uninterruptible power supply of claim 2, wherein the control method comprises: the switching device is controlled to enable two ends of the charging capacitor to be connected to the output end of the rectifying circuit, the power factor correction circuit is controlled to work to alternately output positive direct current bus voltage and negative direct current bus voltage, the first switching tube is controlled to enable the voltage on the charging capacitor to be a preset threshold voltage, and meanwhile the bidirectional DC-DC converter is controlled to work to charge the rechargeable battery by utilizing direct current on the charging capacitor.
16. A control method for the online uninterruptible power supply according to claim 1 or 2, characterized in that the control method comprises: the switching device is controlled so that two ends of the charging capacitor are coupled to the power factor correction circuit, the bidirectional DC-DC converter is controlled to work to charge the charging capacitor by using direct current on the rechargeable battery, and the power factor correction circuit is controlled to work to charge a positive direct current bus and a negative direct current bus by using direct current on the charging capacitor.
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| CN108683247A (en) * | 2018-05-23 | 2018-10-19 | 昆明理工大学 | A kind of uninterruptible power system and method for hybrid fuel cell and ultracapacitor |
| CN108847713A (en) * | 2018-07-23 | 2018-11-20 | 佛山市众盈电子有限公司 | A kind of DC Bus voltage compensatory of uninterruptible power supply and its compensation method |
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| CN111614070B (en) * | 2020-05-29 | 2022-05-10 | 科华恒盛股份有限公司 | Bypass protection circuit, method and uninterrupted power supply |
| CN111999662B (en) * | 2020-09-18 | 2023-01-06 | 山特电子（深圳）有限公司 | Method for detecting external switch state of battery of UPS |
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