WO2017024642A1

WO2017024642A1 - Three-phase rectifier boost circuit and control method therefor, and uninterruptible power supply

Info

Publication number: WO2017024642A1
Application number: PCT/CN2015/088722
Authority: WO
Inventors: 王志东; 刘浩兴; 苏先进; 谢超
Original assignee: 厦门科华恒盛股份有限公司
Priority date: 2015-08-13
Filing date: 2015-09-01
Publication date: 2017-02-16
Also published as: CN105071670A

Abstract

A three-phase rectifier boost circuit and a control method therefor, and an uninterruptible power supply. The circuit mainly comprises a positive battery pack (BAT+), a negative battery pack (BAT-) and a rectifier boost module. The rectifier boost module comprises a first bidirectional thyristor (SCR1), a second bidirectional thyristor (SCR2), a third bidirectional thyristor (SCR3), a first unidirectional thyristor (SCR4), a second unidirectional thyristor (SCR5), a first inductor (L1), a second inductor (L2), a third inductor (L3), a three-phase fully controlled rectifier bridge (11), a first capacitor (C1) and a second capacitor (C2). The present invention realizes the multiplexing of a power level device, increases the power density of a circuit, reduces configurations of a battery, enlarges an application range and improves the reliability of a battery mode.

Description

Three-phase rectification boost circuit, control method thereof and uninterruptible power supply

Technical field

The invention relates to a rectification boosting module and an uninterruptible power supply, in particular to a three-phase rectification boosting circuit, a control method thereof and an uninterruptible power supply.

Background technique

At present, the existing three-phase uninterruptible power supply (referred to as UPS) products generally adopt a three-phase half-bridge rectification boost topology in which a single battery pack is connected, and in the battery state boost mode, only the sum of positive and negative bus voltages can be controlled. In order to maintain the balance between the positive and negative bus voltages, the balance of the positive and negative bus voltages is usually maintained by adding a balancing device. As shown in FIG. 1 of the specification, the additional balancing device not only increases the cost but also increases the circuit. The complexity reduces the reliability of the boost in the battery state. At the same time, the balancing device generates additional power consumption while maintaining the positive and negative bus voltage balance, reducing the efficiency in the battery state boost mode.

In addition, the rectification boost topology of the battery pack negative connection of the single battery pack connection mode to the busbar negative pole is as shown in FIG. 2 of the specification, including the topology applied to the two-level and three-level, but in the modular UPS, the multi-module The UPS needs to share the battery pack and the positive and negative busbars between the UPSs of each module are independent, so this topology cannot be applied to the modular UPS.

Modular UPS has the advantages of high power expansion flexibility and easy online maintenance. It has been widely used in banking, communication and data centers, and is the mainstream development direction of high-frequency UPS in the future. In the modular UPS, the three-phase positive and negative double Boost rectification boosting topology of the dual battery pack is generally used as shown in Figure 3 of the specification. With this topology, multiple modules can share the battery pack and the positive and negative busbars between the modules. Independent, but three inductors and three thyristors are added compared to a three-phase half-bridge UPS rectified boost topology with a single battery pack attached.

In summary, the prior art mainly has the following problems: (1) The three-phase half-bridge UPS rectification boost topology that is connected to the single battery pack cannot be applied to the modular UPS; (2) the three-phase half-bridge two of the single-cell assembled The level UPS rectified boost topology has lower efficiency and reliability in battery operation mode.

Summary of the invention

In view of this, the object of the present invention is to provide a three-phase rectification boosting circuit, a control method thereof and an uninterruptible power supply, which realize multiplexing of power level devices, improve power density of the circuit, reduce battery configuration, and increase application. The range improves the reliability of the battery mode.

The invention is implemented by the following scheme: a three-phase rectification boosting circuit comprising a positive battery pack, a negative battery pack, and a rectified boost module; the rectification boosting module includes a first bidirectional thyristor, a second bidirectional thyristor, and a third a bidirectional thyristor, a first unidirectional thyristor, a second unidirectional thyristor, a first inductor, a second inductor, a third inductor, a three-phase full-controlled rectifier bridge, a first capacitor, a second capacitor; and one end of the first triac One end of the second bidirectional thyristor and one end of the third bidirectional thyristor are respectively connected to one ends of a three-phase electric first phase, a three-phase electric second phase, and a three-phase electric third phase, the first single a cathode of the thyristor and a cathode of the second unidirectional thyristor are respectively connected to a positive end of the positive battery, a negative end of the negative battery, a negative end of the positive battery and a negative battery The positive ends are both connected to the zero line of the three-phase power; the cathode of the first unidirectional thyristor and the other end of the first triac are connected to one end of the first inductor, and the other of the second triac One end connected to the One end of the second inductor, the other end of the third triac and the anode of the second thyristor are connected to one end of the third inductor, and the other end of the first inductor and the other end of the second inductor The other end of the third inductor is respectively connected to the three-phase input end of the three-phase full-controlled rectifier bridge, and the two output ends of the three-phase full-controlled rectifier bridge are respectively connected to one end of the first capacitor and the One end of the second capacitor, the other end of the first capacitor and the other end of the second capacitor are both connected to a three-phase electric zero line.

Further, the three-phase full-controlled rectifier bridge is a three-phase bridge type two-level topology, and includes a first switching device, a second switching device, a third switching device, a fourth switching device, a fifth switching device, and a sixth a switching device; a collector or a drain of the first switching device, the third switching device, and the fifth switching device are connected and serve as a first output end of the three-phase full-controlled rectifier bridge, the second switching device, a fourth switching device, an emitter or a source of the sixth switching device connected as a second output of the three-phase full-controlled rectifier bridge, an emitter or a source of the first switching device and the second switching device a collector or a drain connected to the first phase input of the three-phase full-controlled rectifier bridge, the emitter or source of the third switching device being connected to the collector or drain of the fourth switching device And as a second phase input end of the three-phase full-controlled rectifier bridge, an emitter or a source of the fifth switching device is connected to a collector or a drain of the sixth switching device and serves as the three-phase full Control the third phase input of the rectifier bridge.

Further, the three-phase electric, first bidirectional thyristor, second bidirectional thyristor, third bidirectional thyristor, first inductor, second inductor, third inductor, first switching device and body diode thereof, second switching device and The body diode, the third switching device and the body diode thereof, the fourth switching device and the body diode thereof, the fifth switching device and the body diode thereof, the sixth switching device and the body diode thereof, the first capacitor and the second capacitor constitute a commercial power a rectified boost power stage circuit in an operating mode;

The positive battery group, the negative battery group, the first unidirectional thyristor, the second unidirectional thyristor, the first inductor, the second inductor, the first switching device and the body diode thereof, the second switching device and the body diode thereof, and the fifth The switching device and the body diode thereof, the sixth switching device and the body diode thereof, the first capacitor and the second capacitor constitute a rectified boosting power stage circuit in a battery operating mode.

Further, the three-phase full-controlled rectifier bridge is a three-phase half-bridge I-type three-level topology or a three-phase half-bridge T-type three-level topology.

Wherein the three-phase half-bridge I-type three-level topology includes first to twelfth switching devices to, first to sixth diodes to, wherein the first switching device has an emitter or a source, and a second The collector or the drain of the switching device is connected to the cathode of the first diode, and the emitter or source of the fifth switching device, the collector or the drain of the sixth switching device are connected to the cathode of the third diode The emitter or the source of the ninth switching device, the collector or the drain of the tenth switching device are connected to the cathode of the fifth diode, the emitter or the source of the third switching device, and the set of the fourth switching device The electrode or the drain is connected to the anode of the second diode, and the emitter or the source of the seventh switching device, the collector or the drain of the eighth switching device are connected to the anode of the fourth diode, the eleventh The emitter or the source of the switching device, the collector or the drain of the twelfth switching device are connected to the anode of the sixth diode, the anode of the first diode is connected to the cathode of the second diode, and the third The anode of the diode is connected to the cathode of the fourth diode, and the anode of the fifth diode is a cathode of the sixth diode is connected; a collector or a drain of the first switching device, a collector or a drain of the fifth switching device, a collector or a drain of the ninth switching device are connected and are fully controlled as the three phases a first output end of the rectifier bridge, an emitter or a source of the fourth switching device, an emitter or a source of the eighth switching device, an emitter or a source of the twelfth switching device, and are fully controlled as the three phases a second output end of the rectifier bridge, the emitter or source of the second switching device is connected to the collector or the drain of the third switching device and serves as a first phase input terminal of the three-phase full-controlled rectifier bridge, and a sixth switch The emitter or source of the device is coupled to the collector or drain of the seventh switching device and serves as the second phase input of the three-phase full-controlled rectifier bridge, the emitter or source of the tenth switching device and the eleventh a collector or a drain of the switching device is connected and serves as a third phase input terminal of the three-phase full-controlled rectifier bridge, an anode of the first diode, an anode of the third diode, and an anode of the fifth diode Connect to a three-phase electrical neutral.

Wherein the three-phase half-bridge T-type three-level topology includes first to twelfth switching devices; the emitter or source of the third switching device is connected to the emitter or source of the fourth switching device, and the seventh Switching device The emitter or source is connected to the emitter or source of the eighth switching device, and the emitter or source of the eleventh switching device is connected to the emitter or source of the twelfth switching device; wherein the first switching device is set An electrode or a drain, a collector or a drain of the fifth switching device, a collector or a drain of the ninth switching device are connected and serve as a first output terminal of the three-phase full-controlled rectifier bridge, and an emitter of the second switching device Or the source, the emitter or source of the sixth switching device, the emitter or source of the tenth switching device are connected and serve as the second output of the three-phase full-controlled rectifier bridge, the emitter of the first switching device or a source, a collector or a drain of the second switching device, a collector or a drain of the third switching device connected as a first phase input of the three-phase full-controlled rectifier bridge, an emitter of the fifth switching device or a source, a collector or a drain of the sixth switching device, a collector or a drain of the seventh switching device connected as a second phase input of the three-phase full-controlled rectifier bridge, an emitter of the ninth switching device or Source, collector or drain of the tenth switching device The collector or the drain of the eleventh switching device is connected and serves as a third phase input terminal of the three-phase full-controlled rectifier bridge, a collector or a drain of the fourth switching device, and a collector or drain of the eighth switching device. The collector or the drain of the pole, twelfth switching device is connected to the three-phase electrical neutral.

The present invention also provides a control method for a three-phase rectification booster circuit as described above, controlling the first triac, the second triac, and the third triac to be closed when the mains is normal, and controlling the The first unidirectional thyristor and the second unidirectional thyristor are disconnected, and the three-phase rectification boosting circuit operates in a mains operation mode;

Controlling the first triac, the second bidirectional thyristor, the third bidirectional thyristor, the first switching device, the third switching device, the fourth switching device, and the sixth switching device to be disconnected when the mains is abnormal, and controlling the A unidirectional thyristor and a second unidirectional thyristor are closed, and the three-phase rectification boosting circuit operates in a battery operating mode.

Further, the control mode of the three-phase rectification boost circuit operating in the mains operation mode specifically includes the following stages:

When the three-phase electric first phase voltage is in the positive half cycle, the first switching device is controlled to be in an off state; in the first phase, the second switching device is controlled to be in a conducting state, and the three-phase electric first phase voltage is passed through the first triac The first inductor, the second switching device, and the second capacitor form a loop to store electrical energy to the first inductor; in the second phase, the second switching device is controlled to be in an off state, the first inductor is discharged, and the first inductor discharges the current through the first The body diode of the switching device, the first capacitor, and the first triac return to the first inductor, and the first capacitor is charged;

When the three-phase electric first phase voltage is in a negative half cycle, the second switching device is controlled to be in an off state, and in the third phase, the first switching device is controlled to be in an on state, and the three-phase electric first phase voltage passes through the first bidirectional thyristor, The first inductor, the first switching device, and the first capacitor form a loop to store electrical energy to the first inductor; the fourth phase controls the first switching device to be in an off state, the first inductor discharges, and the first inductor discharges current through the second switching device The body diode, the second capacitor, the first triac return to the first inductor, and the second capacitor is charged;

When the three-phase electric second phase voltage is in the positive half cycle, the third switching device is controlled to be in an off state. In the first phase, the fourth switching device is controlled to be in an on state, and the three-phase electric second phase voltage is passed through the second bidirectional thyristor. The second inductor, the fourth switching device, and the second capacitor form a loop to store electrical energy to the second inductor; in the second phase, the fourth switching device is controlled to be in an off state, the second inductor is discharged, and the second inductor is discharged through the third switch The body diode, the first capacitor, and the second triac of the device return to the second inductor, and the first capacitor is charged;

When the three-phase electric second phase voltage is in a negative half cycle, the fourth switching device is controlled to be in an off state, and in the third phase, the third switching device is controlled to be in an on state, and the three-phase electric second phase voltage is passed through the second bidirectional thyristor, The second inductor, the third switching device, and the first capacitor form a loop to store electrical energy to the second inductor; the fourth phase controls the third switching device to be in an off state, the second inductor discharges, and the second inductor discharges current through the fourth switching device The body diode, the second capacitor, and the second triac return to the second inductor, and the second capacitor is charged;

When the three-phase electric third phase voltage is in the positive half cycle, the fifth switching device is controlled to be in the off state. In the first phase, the sixth switching device is controlled to be in an on state, and the three-phase electric third phase voltage is passed through the third triac, The third inductor, the sixth switching device, and the second capacitor form a loop to store electrical energy for the third inductor; in the second phase, the sixth switching device is controlled to be in an off state, the third inductor is discharged, and the third inductor is discharged through the fifth switch. The body diode, the first capacitor, and the third triac of the device return to the third inductor, and the first capacitor is charged;

When the three-phase electric third phase voltage is in a negative half cycle, the sixth switching device is controlled to be in an off state, and in the third phase, the fifth switching device is controlled to be in an on state, and the three-phase electric third phase voltage is passed through the third bidirectional thyristor, The second inductor, the fifth switching device, and the first capacitor form a loop to store electrical energy to the third inductor; the fourth phase controls the third switching device to be in an off state, the third inductor discharges, and the third inductor discharges current through the sixth switching device The body diode, the second capacitor, and the third triac return to the third inductor, and the second capacitor is charged.

Further, the control mode of the three-phase rectification boosting circuit operating in the battery operating mode specifically includes the following stages:

In the first stage, when the second switching device and the fifth switching device are controlled to be in an on state, the positive battery group, the first unidirectional thyristor, the first inductor, the second switching device, and the second capacitor form a loop to store electrical energy for the first inductor. The negative battery, the first capacitor, the fifth switching device, the third inductor, and the second thyristor form a loop to store electrical energy to the third inductor;

In the second stage, when the second switching device and the fifth switching device are controlled to be in an off state, the first inductor is discharged, and the current discharged by the first inductor passes through the body diode of the first switching device, the first capacitor, the positive battery pack, and the first The unidirectional thyristor returns to the first inductor, and the first capacitor is charged; the third inductor discharges, and the current discharged by the third inductor passes through the second unidirectional thyristor, the negative battery pack, the second capacitor, and the sixth switching device body diode to return to the third Inductance, the second capacitor is charged.

The present invention also provides a three-phase rectification boosting circuit, comprising a positive battery pack, a negative battery pack, and N rectified boost modules; each of the rectification boost modules includes a first triac and a second bidirectional thyristor, a third bidirectional thyristor, a first unidirectional thyristor, a second unidirectional thyristor, a first inductor, a second inductor, a third inductor, a three-phase full-controlled rectifier bridge, a first capacitor, and a second capacitor; the first triac One end of the second bidirectional thyristor and one end of the third bidirectional thyristor are respectively connected to one end of a three-phase electric first phase, a three-phase electric second phase, and a three-phase electric third phase, An anode of a unidirectional thyristor and a cathode of the second unidirectional thyristor are respectively connected to a positive end of the positive battery, a negative end of the negative battery, and a negative end of the positive battery and the negative The positive ends of the battery pack are connected to the three-phase electric zero line; the cathode of the first unidirectional thyristor and the other end of the first triac are connected to one end of the first inductor, the second bidirectional The other end of the thyristor is connected to the first One end of the two inductors, the third bidirectional thyristor and the anode of the second unidirectional thyristor are both connected to one end of the third inductor, and the other ends of the first inductor, the second inductor and the third inductor are respectively connected To the three-phase input end of the three-phase full-controlled rectifier bridge, two output ends of the three-phase full-controlled rectifier bridge are respectively connected to one end of the first capacitor and one end of the second capacitor, A capacitor and the other end of the second capacitor are both connected to a neutral line of three phases.

Similarly, the first bidirectional thyristor, the second bidirectional thyristor, the third bidirectional thyristor, the first inductor, the second inductor, the third inductor, and the third rectifier rectification module 1 (or the Nth rectification boost module N) The phase-controlled rectifier bridge, the first capacitor and the second capacitor constitute a rectified boost power stage circuit in a mains operation mode; The first thyristor, the second unidirectional thyristor, the first inductor, the third inductor, and the three-phase full control of the positive battery pack, the negative battery pack, the first rectification boosting module 1 (or the Nth rectifying boosting module N) The rectifier bridge, the first capacitor, and the second capacitor constitute a rectified boost power stage circuit in a battery operating mode.

Preferably, the three-phase full-controlled rectifier bridge described above may be a three-phase half-bridge dual-level circuit, a three-phase half-bridge I-type three-level circuit or a three-phase half-bridge T-type three-level circuit.

In particular, the present invention also provides an uninterruptible power supply based on the three-phase rectification boost circuit described above, including the three-phase rectification boost circuit, an inverter module, and an input end of the inverter module The output ends of the three-phase full-controlled rectifier bridge are connected.

Compared with the prior art, the present invention has the following advantageous effects.

(1) The three-phase rectification boosting circuit of the present invention shares power devices such as inductors and switching tubes (such as IGBTs) in the mains operation mode and the battery operation mode, and realizes different functions under different working conditions by sharing devices in the topology. The multiplexing of power stage devices is realized, the number of power devices is reduced, the power density of the circuit is increased, and the circuit cost is reduced.

(2) The three-phase rectification boosting circuit of the invention adopts a double battery pack, and the battery pack can be shared between different devices, thereby reducing the configuration of the battery and increasing the application range.

(3) The three-phase rectification boosting circuit of the invention independently boosts the positive and negative busbars in the battery operating mode, and the balance of the positive and negative busbars can be realized without additional balancing devices, allowing the positive and negative busbars to have unbalanced loads and improving the battery mode. Reliability, reducing costs.

(4) The three-phase rectification boosting module of the invention is in a half-bridge working mode when the mains is running, the input voltage and current can be operated in four phase limits, and the rectifier has the boosting and feedback capability at the same time, thereby improving the applicable range of the device.

DRAWINGS

FIG. 1 is a three-phase bridge type two-level rectification boost topology of the prior art with a balancing device single battery pack.

2 is a three-phase bridge arm rectification boost topology of a prior art single battery pack.

3 is a three-phase positive and negative dual Boost rectification boost topology of a prior art dual battery pack.

4 is a schematic diagram of a three-phase rectification boost circuit of the present invention.

FIG. 5 is a schematic diagram of a three-phase rectification boosting circuit according to Embodiment 1 of the present invention.

FIG. 6 is an equivalent diagram of a three-phase bridge type two-level rectification boosting partial topology in which a dual battery is connected in a mains operation mode according to Embodiment 1 of the present invention.

FIG. 7 is a schematic diagram showing the working principle of the first phase of the rectification and boosting in the first half cycle of the three-phase electric first phase voltage in the first embodiment of the present invention.

FIG. 8 is a schematic diagram showing the operation of the three-phase electric first phase voltage in the positive half cycle and the second phase of the rectification boosting according to the first embodiment of the present invention.

FIG. 9 is a schematic diagram showing the operation of the three-phase electric first phase voltage in the negative half cycle and the third phase of the rectification boosting according to the first embodiment of the present invention.

FIG. 10 is a schematic diagram showing the operation of the fourth phase of the three-phase electric first phase voltage in the negative half cycle and the fourth phase of the rectification boosting according to the first embodiment of the present invention.

11 is a three-phase bridge type two-level rectification boost topology in which a dual battery pack is mounted in the first embodiment of the present invention; The equivalent diagram of the battery operating mode.

FIG. 12 is a schematic diagram showing the operation mode of the battery in the first stage of the positive battery pack BAT+ rectification boosting according to the first embodiment of the present invention.

FIG. 13 is a schematic diagram showing the operation of the first stage of the BAT-rectification boosting of the negative battery pack in the battery operating mode according to the first embodiment of the present invention.

FIG. 14 is a schematic diagram showing the operation of the second stage of the positive battery pack BAT+rectification boosting in the battery operating mode according to the first embodiment of the present invention.

FIG. 15 is a schematic diagram showing the operation of the second stage of the BAT-rectification boosting of the negative battery pack in the battery operating mode according to the first embodiment of the present invention.

16 is a three-phase half-bridge I-type three-level rectification boosting part topology in which a dual battery is attached in the first embodiment of the present invention.

17 is a three-phase half-bridge T-type three-level rectification boosting part topology in which a dual battery is attached in the first embodiment of the present invention.

18 is a schematic diagram showing the connection relationship of a multi-channel three-phase rectification boosting circuit in Embodiment 2 of the present invention.

FIG. 19 is a schematic diagram showing the connection relationship of two-way three-phase rectification boosting circuit in Embodiment 2 of the present invention.

Figure 20 is a schematic diagram of an uninterruptible power supply circuit in Embodiment 3 of the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Example 1.

As shown in FIG. 4, the embodiment provides a three-phase rectification boosting circuit, including a positive battery pack BAT+, a negative battery pack BAT-, and a rectified boost module; the rectification boost module includes a first triac SCR1, second bidirectional thyristor SCR2, third bidirectional thyristor SCR3, first unidirectional thyristor SCR4, second unidirectional thyristor SCR5, first inductor L1, second inductor L2, third inductor L3, three-phase full-controlled rectifier bridge, a first capacitor C1 and a second capacitor C2; one end of the first triac SCR1, one end of the second triac SCR2, and one end of the third triac SCR3 are respectively connected to a three-phase electric first phase, One end of the three-phase electric second phase and the three-phase electric third phase, the anode of the first unidirectional thyristor SCR4 and the cathode of the second unidirectional thyristor SCR5 are respectively connected to the positive end of the positive battery pack BAT+ a negative terminal of the negative battery pack BAT-, a negative terminal of the positive battery pack BAT+ and a positive terminal of the negative battery pack BAT- are connected to a three-phase electric zero line; the first unidirectional thyristor SCR4 a cathode connected to the other end of the first triac SCR1 To one end of the first inductor L1, the other end of the second triac SCR2 is connected to one end of the second inductor L2, the other end of the third triac SCR3 and the second unidirectional thyristor SCR5 The anode is connected to one end of the third inductor L3, and the other end of the first inductor L1, the other end of the second inductor L2, and the other end of the third inductor L3 are respectively connected to the three-phase full-controlled rectifier bridge. The two output terminals of the three-phase full-controlled rectifier bridge are respectively connected to one end of the first capacitor C1 and one end of the second capacitor C2, and the other end of the first capacitor C1 is The other end of the second capacitor C2 is connected to the zero line of the three-phase electric.

In this embodiment, as shown in FIG. 5, the three-phase full-controlled rectifier bridge is a three-phase half-bridge dual-level topology, including a first switching transistor Q1, a body diode D1, a second switching transistor Q2, and Body diode D2, third switching transistor Q3 and its body diode D3, fourth switching transistor Q4 and its body diode D4, fifth switching transistor Q5 and its body diode D5, sixth switching transistor Q6 and its body diode D6; The collectors of the first switching transistor Q1, the third switching transistor Q3, and the fifth switching transistor Q5 are connected and serve as a first output end of the three-phase full-controlled rectifier bridge, the second switching transistor Q2, and the fourth switching transistor Q4 The emitter of the sixth switching transistor Q6 is connected and serves as a second output end of the three-phase full-controlled rectifier bridge, and the emitter of the first switching transistor Q1 is connected to the collector of the second switching transistor Q2 and serves as a first phase input end of the three-phase full-controlled rectifier bridge, the third switch triode The emitter of Q3 is connected to the collector of the fourth switching transistor Q4 and serves as a second phase input terminal of the three-phase full-controlled rectifier bridge, the emitter of the fifth switching transistor Q5 and the sixth switching transistor The collector of Q6 is connected and serves as the third phase input of the three-phase full-controlled rectifier bridge.

In this embodiment, as shown in FIG. 6, the three-phase electric, first bidirectional thyristor SCR1, second bidirectional thyristor SCR2, third triac SCR3, first inductor L1, second inductor L2, and third inductor L3 , the first switching transistor Q1 and its body diode D1, the second switching transistor Q2 and its body diode D2, the third switching transistor Q3 and its body diode D3, the fourth switching transistor Q4 and its body diode D4, the fifth switching transistor Q5 And the body diode D5, the sixth switch transistor Q6 and its body diode D6, the first capacitor C1, the second capacitor C2 constitute a rectified boost power stage circuit in the mains operating mode;

As shown in FIG. 11, the positive battery pack BAT+, the negative battery pack BAT-, the first unidirectional thyristor SCR4, the second unidirectional thyristor SCR5, the first inductor L1, the second inductor L2, the first switch transistor Q1, and The body diode D1, the second switching transistor Q2 and its body diode D2, the fifth switching transistor Q5 and its body diode D5, the sixth switching transistor Q6 and its body diode D6, the first capacitor C1, the second capacitor C2 constitute a battery operating mode The rectified boost power stage circuit.

In this embodiment, the three-phase full-controlled rectifier bridge is a three-phase half-bridge I-type three-level circuit (as shown in FIG. 16) or a three-phase half-bridge T-type three-level topology (as shown in FIG. 17). ).

Wherein, as shown in FIG. 16, the three-phase half-bridge I-type three-level topology includes first to twelfth switching devices Q1 to Q12, first to sixth diodes D1 to D6, wherein the first switch The emitter or source of the device Q1, the collector or the drain of the second switching device Q2 are connected to the cathode of the first diode D1, the emitter or source of the fifth switching device Q5, and the sixth switching device Q6. The collector or the drain is connected to the cathode of the third diode D3, the emitter or source of the ninth switching device Q9, the collector or the drain of the tenth switching device Q10 and the cathode of the fifth diode D5 Connected, the emitter or source of the third switching device Q3, the collector or the drain of the fourth switching device Q4 are connected to the anode of the second diode D2, and the emitter or source of the seventh switching device Q7, The collector or the drain of the eight-switch device Q8 is connected to the anode of the fourth diode D4, the emitter or the source of the eleventh switching device Q11, and the collector or the drain of the twelfth switching device Q12 are both The anode of the six diode D6 is connected, the anode of the first diode D1 is connected to the cathode of the second diode D2, and the third diode D3 The anode is connected to the cathode of the fourth diode D4, the anode of the fifth diode D5 is connected to the cathode of the sixth diode D6; the collector or the drain of the first switching device Q1, and the set of the fifth switching device Q5 An electrode or a drain, a collector or a drain of the ninth switching device Q9 is connected and serves as a first output terminal of the three-phase full-controlled rectifier bridge, an emitter or a source of the fourth switching device Q4, and an eighth switching device Q8. The emitter or source, the emitter or source of the twelfth switching device Q12 is connected and serves as the second output of the three-phase full-controlled rectifier bridge, the emitter or source of the second switching device Q2 and the third The collector or the drain of the switching device Q3 is connected and serves as a first phase input terminal of the three-phase full-controlled rectifier bridge, and the emitter or source of the sixth switching device Q6 and the collector or drain of the seventh switching device Q7 Connected and used as the second phase input terminal of the three-phase full-controlled rectifier bridge, the emitter or source of the tenth switching device Q10 is connected to the collector or the drain of the eleventh switching device Q11 and serves as the three-phase full The third phase input terminal of the control rectifier bridge, the anode of the first diode D1, and the third diode The anode of D3 and the anode of fifth diode D5 are all connected to a three-phase electric zero line.

Wherein, as shown in FIG. 17, the three-phase half-bridge T-type three-level topology includes first to twelfth switching devices; the emitter or source of the third switching device Q3 and the emission of the fourth switching device Q4 The emitter or the source of the seventh switching device Q7 is connected to the emitter or source of the eighth switching device Q8, and the emitter or source of the eleventh switching device Q11 and the twelfth switching device Q12 Emitter or source a pole connected; wherein the collector or the drain of the first switching device Q1, the collector or the drain of the fifth switching device Q5, and the collector or drain of the ninth switching device Q9 are connected as the three-phase full-controlled rectifier bridge a first output terminal, an emitter or a source of the second switching device Q2, an emitter or a source of the sixth switching device Q6, an emitter or a source of the tenth switching device Q10, and connected as the three-phase full control a second output end of the rectifier bridge, an emitter or a source of the first switching device Q1, a collector or a drain of the second switching device Q2, and a collector or a drain of the third switching device Q3 are connected as the three-phase a first phase input terminal of the full-controlled rectifier bridge, an emitter or a source of the fifth switching device Q5, a collector or a drain of the sixth switching device Q6, and a collector or a drain of the seventh switching device Q7 are connected a second phase input terminal of the three-phase full-controlled rectifier bridge, an emitter or a source of the ninth switching device Q9, a collector or a drain of the tenth switching device Q10, and a collector or a drain of the eleventh switching device Q11 Connected and used as the third phase input terminal of the three-phase full-controlled rectifier bridge, fourth Switching device Q4 and the collector or drain of the eighth switching device Q8 is a collector or drain, the twelfth switching device Q12 is connected to the collector or drain of a three-phase neutral.

This embodiment also proposes a control method of the three-phase rectification boosting circuit as described above, specifically:

When the utility power is normal, the first triac SCR1, the second bidirectional thyristor SCR2, and the third bidirectional thyristor SCR3 are controlled to be closed, and the first unidirectional thyristor SCR4 and the second unidirectional thyristor SCR5 are controlled to be disconnected. The three-phase rectification boost circuit operates in a mains operation mode;

When the utility power is abnormal, the first triac SCR1, the second bidirectional thyristor SCR2, the third bidirectional thyristor SCR3, the first switching transistor Q1, the third switching transistor Q3, the fourth switching transistor Q4, and the sixth switching transistor Q6 are controlled. Disconnected, controlling the first unidirectional thyristor SCR4 and the second unidirectional thyristor SCR5 to be closed, and the three-phase rectification boosting circuit operates in a battery operating mode.

Further, in this embodiment, the control mode of the three-phase rectification boost circuit operating in the mains operation mode specifically includes the following stages:

As shown in FIG. 7, when the three-phase electric first phase voltage is in the positive half cycle, the first switching transistor Q1 is controlled to be in an off state; in the first phase, the second switching transistor Q2 is controlled to be in a conducting state, and the three-phase electric current is The first phase voltage is passed through the first triac SCR1, the first inductor L1, the second switch transistor Q2, and the second capacitor C2 to form a loop to store electrical energy for the first inductor L1; as shown in FIG. 8, the second phase controls the second switch transistor Q2 is in the off state, the first inductor L1 is discharged, and the current discharged by the first inductor L1 passes through the body diode of the first switching transistor Q1, the first capacitor C1, and the first triac SCR1 returns to the first inductor L1, and the first capacitor C1 Charging

As shown in FIG. 9, when the three-phase electric first phase voltage is in the negative half cycle, the second switching transistor Q2 is controlled to be in the off state, and in the third phase, the first switching transistor Q1 is controlled to be in the on state, and the three-phase electric first The phase voltage is stored in the first inductor L1 through the first triac SCR1, the first inductor L1, the first switch transistor Q1, and the first capacitor C1; as shown in FIG. 10, the fourth stage controls the first switch transistor Q1 to be in the fourth stage. In the off state, the first inductor L1 is discharged, and the current discharged by the first inductor L1 passes through the body diode of the second switching transistor Q2, the second capacitor C2, the first triac SCR1 returns to the first inductor L1, and the second capacitor C2 is charged;

When the three-phase electric second phase voltage is in the positive half cycle, the third switching transistor Q3 is controlled to be in an off state. In the first phase, the fourth switching transistor Q4 is controlled to be in a conducting state, and the three-phase electric second phase voltage is in a second bidirectional state. The thyristor SCR2, the second inductor L2, the fourth switch transistor Q4, and the second capacitor C2 form a loop to store electrical energy to the second inductor L2; in the second phase, the fourth switch transistor Q4 is controlled to be in an off state, The second inductor L2 is discharged, and the current discharged by the second inductor L2 passes through the body diode of the third switching transistor Q3, the first capacitor C1, and the second triac SCR2 returns to the second inductor L2, and the first capacitor C1 is charged;

When the three-phase electric second phase voltage is in the negative half cycle, the fourth switching transistor Q4 is controlled to be in the off state, and in the third phase, the third switching transistor Q3 is controlled to be in the conducting state, and the three-phase electric second phase voltage is in the second bidirectional state. The thyristor SCR2, the second inductor L2, the third switch transistor Q3, and the first capacitor C1 form a loop to store electrical energy to the second inductor L2; the fourth phase controls the third switch transistor Q3 to be in an off state, the second inductor L2 is discharged, and a second The current discharged by the inductor L2 passes through the body diode of the fourth switching transistor Q4, the second capacitor C2, the second triac SCR2 returns to the second inductor L2, and the second capacitor C2 is charged;

When the three-phase electric third phase voltage is in the positive half cycle, the fifth switching transistor Q5 is controlled to be in the off state. In the first stage, the sixth switching transistor Q6 is controlled to be in the on state, and the three-phase electric third phase voltage is passed through the third bidirectional. The thyristor SCR3, the third inductor L3, the sixth switch transistor Q6, and the second capacitor C2 form a loop to store electrical energy to the third inductor L3; in the second stage, the sixth switch transistor Q6 is controlled to be in an off state, and the third inductor L3 is discharged. The current discharged by the three inductor L3 passes through the body diode of the fifth switching transistor Q5, the first capacitor C1, and the third triac SCR3 returns to the third inductor L3, and the first capacitor C1 is charged;

When the three-phase electric third phase voltage is in the negative half cycle, the sixth switching transistor Q6 is controlled to be in the off state, and in the third phase, the fifth switching transistor Q5 is controlled to be in the conducting state, and the three-phase electric third phase voltage is in the third bidirectional state. The thyristor SCR3, the second inductor L2, the fifth switch transistor Q5, and the first capacitor C1 form a loop to store electrical energy to the third inductor L3; the fourth phase controls the third switch transistor Q3 to be in an off state, and the third inductor L3 is discharged, and a third The current discharged by the inductor L3 passes through the body diode of the sixth switching transistor Q6, the second capacitor C2, the third triac SCR3 returns to the third inductor L3, and the second capacitor C2 is charged.

In this embodiment, the control mode of the three-phase rectification boosting circuit operating in the battery operating mode specifically includes the following stages:

In the first stage, as shown in FIG. 12 and FIG. 13, when the second switching transistor Q2 and the fifth switching transistor Q5 are controlled to be in an on state, the positive battery pack BAT+, the first unidirectional thyristor SCR4, the first inductor L1, and the second The switch transistor Q2 and the second capacitor C2 form a loop to store electrical energy to the first inductor L1; the negative battery pack BAT-, the first capacitor C1, the fifth switch transistor Q5, the third inductor L3, and the second unidirectional thyristor SCR5 form a loop pair Three inductors L3 store electrical energy;

In the second stage, as shown in FIG. 14 and FIG. 15, when the second switching transistor Q2 and the fifth switching transistor Q5 are in the off state, the first inductor L1 is discharged, and the current discharged by the first inductor L1 passes through the first switching transistor Q1. The body diode, the first capacitor C1, the positive battery pack BAT+, the first unidirectional thyristor SCR4 return to the first inductor L1, the first capacitor C1 is charged; the third inductor L3 is discharged, and the third inductor L3 discharges the current through the second single The thyristor SCR5, the negative battery BAT-, the second capacitor C2, and the sixth switching transistor Q2 body diode return to the third inductor L3, and the second capacitor C2 is charged.

Example 2.

The invention also proposes a three-phase rectification boosting circuit, as shown in FIG. 18, comprising a positive battery pack BAT+, a negative battery pack BAT-, and N rectification boost modules; each of the rectification boost modules includes a first A bidirectional thyristor SCR1, a second bidirectional thyristor SCR2, a third bidirectional thyristor SCR3, a first unidirectional thyristor SCR4, a second unidirectional thyristor SCR5, a first inductor L1, a second inductor L2, a third inductor L3, and a three-phase full control a rectifier bridge, a first capacitor C1, a second capacitor C2; one end of the first triac SCR1, one end of the second triac SCR2, and one end of the third triac SCR3 respectively Connected to one end of the three-phase electric first phase, the three-phase electric second phase, and the three-phase electric third phase, the anode of the first unidirectional thyristor SCR4 and the cathode of the second unidirectional thyristor SCR5 are respectively connected to The positive terminal of the positive battery pack BAT+, the negative terminal of the negative battery pack BAT-, the negative terminal of the positive battery pack BAT+ and the positive terminal of the negative battery pack BAT- are both connected to the neutral line of the three-phase battery The cathode of the first unidirectional thyristor SCR4 and the other end of the first triac SCR1 are connected to one end of the first inductor L1, and the other end of the second triac SCR2 is connected to the second One end of the inductor L2, the third triac SCR3 and the anode of the second unidirectional thyristor SCR5 are both connected to one end of the third inductor L3, the first inductor L1, the second inductor L2, and the third inductor The other ends of the L3 are respectively connected to the three-phase input ends of the three-phase full-controlled rectifier bridge, and the two output ends of the three-phase full-controlled rectifier bridge are respectively connected to one end of the first capacitor C1 and the second One end of the capacitor C2, the other end of the first capacitor C1 and the second capacitor C2 are connected to Zero line of three-phase electricity. Preferably, FIG. 19 is a circuit diagram showing an example in which N is 2.

Similarly, the first bidirectional thyristor SCR1, the second bidirectional thyristor SCR2, the third bidirectional thyristor SCR3, the first inductor L1, and the second inductor L2 of the first rectification boosting module 1 (or the Nth rectifying boosting module N) The third inductor L3, the three-phase full-controlled rectifier bridge, the first capacitor C1, and the second capacitor C2 constitute a rectified boost power stage circuit in the mains operation mode; the positive battery pack BAT+, the negative battery pack BAT-, and the first commutation rise The first thyristor SCR4, the second unidirectional thyristor SCR5, the first inductor L1, the third inductor L3, the three-phase full-controlled rectifier bridge, and the first capacitor C1 of the voltage module 1 (or the Nth rectification boost module N) The second capacitor C2 constitutes a rectified boost power stage circuit in a battery mode of operation.

Example 3.

In particular, the embodiment further provides an uninterruptible power supply based on the three-phase rectification boost circuit described above, as shown in FIG. 20, including the three-phase rectification boost circuit and an inverter module. The input end of the inverter module is connected to the output end of the three-phase full-controlled rectifier bridge.

Similarly, the first bidirectional thyristor SCR1, the second bidirectional thyristor SCR2, the third bidirectional thyristor SCR3, the first inductor L1, the second inductor L2, the third inductor L3, the three-phase full-controlled rectifier bridge, the first capacitor C1, the second The capacitor C2 constitutes a rectified boost power stage circuit in the mains operation mode; the positive battery pack BAT+, the negative battery pack BAT-, the first unidirectional thyristor SCR4, the second unidirectional thyristor SCR5, the first inductor L1, and the third inductor L3 The three-phase full-controlled rectifier bridge, the first capacitor C1, and the second capacitor C2 constitute a rectified boost power stage circuit in a battery operating mode.

Preferably, the three-phase full-controlled rectifier bridge in this embodiment may be a three-phase half-bridge dual-level circuit, a three-phase half-bridge I-type three-level circuit or a three-phase half-bridge T-type three-level circuit.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should fall within the scope of the present invention.

Claims

A three-phase rectification boosting circuit, comprising: a positive battery pack, a negative battery pack, and a rectified boost module; the rectification boosting module includes a first bidirectional thyristor, a second bidirectional thyristor, and a third bidirectional thyristor, a first unidirectional thyristor, a second unidirectional thyristor, a first inductor, a second inductor, a third inductor, a three-phase full-controlled rectifier bridge, a first capacitor, and a second capacitor; one end of the first triac, the One end of the second bidirectional thyristor and one end of the third bidirectional thyristor are respectively connected to one ends of a three-phase electric first phase, a three-phase electric second phase, and a three-phase electric third phase, and the first unidirectional thyristor An anode, a cathode of the second unidirectional thyristor respectively connected to a positive end of the positive battery, a negative end of the negative battery, a negative end of the positive battery and a positive end of the negative battery Each of the cathodes of the first unidirectional thyristor and the other end of the first triac are connected to one end of the first inductor, and the other end of the second triac is connected To the second inductance The other end of the third unidirectional thyristor and the anode of the second unidirectional thyristor are connected to one end of the third inductor, the other end of the first inductor, the other end of the second inductor, and the third The other ends of the inductors are respectively connected to the three-phase input ends of the three-phase full-controlled rectifier bridge, and the two output ends of the three-phase full-controlled rectifier bridge are respectively connected to one end of the first capacitor and the second capacitor At one end, the other end of the first capacitor and the other end of the second capacitor are connected to a three-phase electric zero line.
A three-phase rectification boosting circuit according to claim 1, wherein said three-phase full-controlled rectifier bridge is a three-phase bridge type two-level topology, comprising a first switching device, a second switching device, a third switching device, a fourth switching device, a fifth switching device, and a sixth switching device; the collector or the drain of the first switching device, the third switching device, and the fifth switching device are connected as the three-phase all Controlling, at a first output end of the rectifier bridge, an emitter or a source of the second switching device, the fourth switching device, and the sixth switching device are connected as a second output end of the three-phase full-controlled rectifier bridge, An emitter or a source of the first switching device is connected to a collector or a drain of the second switching device and serves as a first phase input terminal of the three-phase full-controlled rectifier bridge, an emitter of the third switching device Or a source connected to a collector or a drain of the fourth switching device and serving as a second phase input terminal of the three-phase full-controlled rectifier bridge, an emitter or a source of the fifth switching device and the first The collector or drain of the six-switch device is connected and The third phase input terminal of the three-phase fully controlled rectifier bridge.
A three-phase rectification boosting circuit according to claim 2, wherein:

The three-phase electric, first bidirectional thyristor, second bidirectional thyristor, third bidirectional thyristor, first inductor, second inductor, third inductor, first switching device and body diode thereof, second switching device and body diode thereof The third switching device and the body diode thereof, the fourth switching device and the body diode thereof, the fifth switching device and the body diode thereof, the sixth switching device and the body diode thereof, the first capacitor and the second capacitor constitute a mains operation mode Rectified boost power stage circuit;

The positive battery group, the negative battery group, the first unidirectional thyristor, the second unidirectional thyristor, the first inductor, the second inductor, the first switching device and the body diode thereof, the second switching device and the body diode thereof, and the fifth The switching device and the body diode thereof, the sixth switching device and the body diode thereof, the first capacitor and the second capacitor constitute a rectified boosting power stage circuit in a battery operating mode.
A three-phase rectification boosting circuit according to claim 1, wherein said three-phase full-controlled rectifier bridge is a three-phase half-bridge I-type three-level topology or a three-phase half-bridge T-type three-level Topology.
A three-phase rectification boosting circuit according to claim 4, wherein said three-phase half-bridge I-type three-level topology comprises first to twelfth switching devices, first to sixth dipoles a tube, wherein an emitter or a source of the first switching device, a collector or a drain of the second switching device are connected to a cathode of the first diode, an emitter or a source of the fifth switching device, and a sixth switching device The collector or the drain is connected to the cathode of the third diode, the emitter or source of the ninth switching device, and the collector or the drain of the tenth switching device are Connected to the cathode of the fifth diode, the emitter or source of the third switching device, the collector or the drain of the fourth switching device are connected to the anode of the second diode, and the emitter of the seventh switching device or The collector or the drain of the source and the eighth switching device are connected to the anode of the fourth diode, and the emitter or the source of the eleventh switching device and the collector or the drain of the twelfth switching device are both The anode of the six diode is connected, the anode of the first diode is connected to the cathode of the second diode, the anode of the third diode is connected to the cathode of the fourth diode, and the anode of the fifth diode is a cathode of the sixth diode is connected; a collector or a drain of the first switching device, a collector or a drain of the fifth switching device, a collector or a drain of the ninth switching device are connected and are fully controlled as the three phases a first output end of the rectifier bridge, an emitter or a source of the fourth switching device, an emitter or a source of the eighth switching device, an emitter or a source of the twelfth switching device, and are fully controlled as the three phases a second output of the rectifier bridge, an emitter or source of the second switching device a collector or a drain of the three-switch device is connected and serves as a first phase input terminal of the three-phase full-controlled rectifier bridge, and an emitter or a source of the sixth switching device is connected to a collector or a drain of the seventh switching device and As a second phase input terminal of the three-phase full-controlled rectifier bridge, an emitter or a source of the tenth switching device is connected to a collector or a drain of the eleventh switching device and serves as the three-phase full-controlled rectifier bridge The third phase input terminal, the anode of the first diode, the anode of the third diode, and the anode of the fifth diode are all connected to the three-phase electric zero line.
A three-phase rectification boosting circuit according to claim 4, wherein said three-phase half-bridge T-type three-level topology comprises first to twelfth switching devices; and an emitter of said third switching device Or the source is connected to the emitter or source of the fourth switching device, and the emitter or source of the seventh switching device is connected to the emitter or source of the eighth switching device, and the emitter or source of the eleventh switching device Connected to the emitter or source of the twelfth switching device; wherein the collector or drain of the first switching device, the collector or drain of the fifth switching device, the collector or drain of the ninth switching device are connected and a first output end of the three-phase full-controlled rectifier bridge, an emitter or a source of the second switching device, an emitter or a source of the sixth switching device, and an emitter or a source of the tenth switching device are connected a second output end of the three-phase full-controlled rectifier bridge, an emitter or a source of the first switching device, a collector or a drain of the second switching device, and a collector or a drain of the third switching device are connected as the First phase input of a three-phase fully controlled rectifier bridge An emitter or a source of the fifth switching device, a collector or a drain of the sixth switching device, a collector or a drain of the seventh switching device are connected and serve as a second phase input terminal of the three-phase full-controlled rectifier bridge, An emitter or a source of the ninth switching device, a collector or a drain of the tenth switching device, a collector or a drain of the eleventh switching device are connected and serve as a third phase input terminal of the three-phase full-controlled rectifier bridge The collector or the drain of the fourth switching device, the collector or the drain of the eighth switching device, and the collector or the drain of the twelfth switching device are all connected to the three-phase electric zero line.
A method of controlling a three-phase rectification boosting circuit according to claim 2, wherein:

When the utility power is normal, the first triac, the second bidirectional thyristor, and the third triac are closed, and the first unidirectional thyristor and the second thyristor are controlled to be disconnected. The voltage circuit works in the mains operation mode;

Controlling the first triac, the second bidirectional thyristor, the third triac SCR3, the first switching device, the third switching device, the fourth switching device, and the sixth switching device to be disconnected when the mains is abnormal, and controlling the The first unidirectional thyristor and the second unidirectional thyristor are closed, and the three-phase rectification boosting circuit operates in a battery operating mode.
The control method of a three-phase rectification boosting circuit according to claim 7, wherein the control mode of the three-phase rectification boosting circuit operating in the mains operation mode comprises the following phases:

When the three-phase electric first phase voltage is in the positive half cycle, the first switching device is controlled to be in an off state; in the first phase, the second switching device is controlled to be in a conducting state, and the three-phase electric first phase voltage is passed through the first triac The first inductor, the second switching device, and the second capacitor form a loop to store electrical energy to the first inductor; in the second phase, the second switching device is controlled to be in an off state, the first inductor is discharged, and the first inductor discharges the current through the first The body diode of the switching device, the first capacitor, the first triac return to the first inductor, and the first capacitor is charged; when the three-phase first phase voltage is in a negative half cycle, the second switching device is controlled to be in an off state, and the third a phase, the first switching device is controlled to be in a conducting state, and the three-phase first phase voltage is stored in the first inductor through the first triac, the first inductor, the first switching device, and the first capacitor to form a circuit; The first switching device is in an off state, the first inductor is discharged, and the current discharged by the first inductor passes through the body diode of the second switching device, the second capacitor, the first triac returns to the first inductor, and the second capacitor is charged;

When the three-phase electric second phase voltage is in the positive half cycle, the third switching device is controlled to be in an off state. In the first phase, the fourth switching device is controlled to be in an on state, and the three-phase electric second phase voltage is passed through the second bidirectional thyristor. The second inductor, the fourth switching device, and the second capacitor form a loop to store electrical energy to the second inductor; in the second phase, the fourth switching device is controlled to be in an off state, the second inductor is discharged, and the second inductor is discharged through the third switch The body diode, the first capacitor, and the second triac of the device return to the second inductor, and the first capacitor is charged;

When the three-phase electric second phase voltage is in a negative half cycle, the fourth switching device is controlled to be in an off state, and in the third phase, the third switching device is controlled to be in an on state, and the three-phase electric second phase voltage is passed through the second bidirectional thyristor, The second inductor, the third switching device, and the first capacitor form a loop to store electrical energy to the second inductor; the fourth phase controls the third switching device to be in an off state, the second inductor discharges, and the second inductor discharges current through the fourth switching device The body diode, the second capacitor, and the second triac return to the second inductor, and the second capacitor is charged;

When the three-phase electric third phase voltage is in the positive half cycle, the fifth switching device is controlled to be in the off state. In the first phase, the sixth switching device is controlled to be in an on state, and the three-phase electric third phase voltage is passed through the third triac, The third inductor, the sixth switching device, and the second capacitor form a loop to store electrical energy for the third inductor; in the second phase, the sixth switching device is controlled to be in an off state, the third inductor is discharged, and the third inductor is discharged through the fifth switch. The body diode, the first capacitor, and the third triac of the device return to the third inductor, and the first capacitor is charged;

When the three-phase electric third phase voltage is in a negative half cycle, the sixth switching device is controlled to be in an off state, and in the third phase, the fifth switching device is controlled to be in an on state, and the three-phase electric third phase voltage is passed through the third bidirectional thyristor, The second inductor, the fifth switching device, and the first capacitor form a loop to store electrical energy to the third inductor; the fourth phase controls the third switching device to be in an off state, the third inductor discharges, and the third inductor discharges current through the sixth switching device The body diode, the second capacitor, and the third triac return to the third inductor, and the second capacitor is charged.
The control method of a three-phase rectification boosting circuit according to claim 7, wherein the control mode of the three-phase rectification boosting circuit operating in the battery operating mode specifically comprises the following stages:

In the first stage, when the second switching device and the fifth switching device are controlled to be in an on state, the positive battery group, the first unidirectional thyristor, the first inductor, the second switching device, and the second capacitor form a loop to store electrical energy for the first inductor. The negative battery, the first capacitor, the fifth switching device, the third inductor, and the second thyristor form a loop to store electrical energy to the third inductor;

In the second stage, when the second switching device and the fifth switching device are controlled to be in an off state, the first inductor is discharged, and the current discharged by the first inductor passes through the body diode of the first switching device, the first capacitor, the positive battery pack, and the first The unidirectional thyristor returns to the first inductor, and the first capacitor is charged; the third inductor discharges, and the current discharged by the third inductor passes through the second unidirectional thyristor, the negative battery pack, the second capacitor, and the sixth switching device body diode to return to the third Inductance, the second capacitor is charged.
A three-phase rectification boosting circuit, comprising: a positive battery pack, a negative battery pack, and N rectified boost modules; each of the rectification boost modules includes a first bidirectional thyristor and a second triac SCR2 a third bidirectional thyristor, a first unidirectional thyristor, a second unidirectional thyristor, a first inductor, a second inductor, a third inductor, a three-phase full-controlled rectifier bridge, a first capacitor, and a second capacitor; the first triac One end of the second bidirectional thyristor and one end of the third bidirectional thyristor are respectively connected to one end of a three-phase electric first phase, a three-phase electric second phase, and a three-phase electric third phase, An anode of a unidirectional thyristor and a cathode of the second unidirectional thyristor are respectively connected to a positive end of the positive battery pack and the negative battery a negative end of the positive battery pack and a positive terminal of the negative battery pack are connected to a three-phase electric zero line; a cathode of the first unidirectional thyristor and an anode of the first triac Connected to one end of the first inductor, the other end of the second triac is connected to one end of the second inductor, and the other end of the third triac is connected to the anode of the second thyristor Up to one end of the third inductor, the other ends of the first inductor, the second inductor, and the third inductor are respectively connected to three-phase input ends of the three-phase full-controlled rectifier bridge, and the three-phase full-controlled rectifier bridge The two outputs are respectively connected to one end of the first capacitor and one end of the second capacitor, and the other ends of the first capacitor and the second capacitor are connected to a zero line of three-phase electric.
An uninterruptible power supply for a three-phase rectification boosting circuit according to any one of claims 1 to 6, characterized in that it comprises: the three-phase rectification boosting circuit, an inverter module, and an input end of the inverter module The output ends of the three-phase full-controlled rectifier bridge are connected.