Electronic device for driving a load

Abstract

The present application provides an electronic device for driving a load, comprising a power factor corrector, a DC bus, an auxiliary circuit and a conversion circuit. The power factor corrector is configured to receive driving power. The DC bus is connected in parallel with the power factor corrector and comprises a plurality of capacitors connected in series. The auxiliary circuit is connected in parallel with the DC bus and comprises a midpoint voltage, wherein the midpoint voltage is electrically coupled to a backup power device. The conversion circuit is connected in parallel with the auxiliary circuit and is configured to drive the load. When the driving power is from the backup power device and the load is disabled to generate reverse energy, the reverse energy flows into the auxiliary circuit, and the electronic device is configured to operate the auxiliary circuit to allow the reverse energy to flow from the midpoint voltage to the backup power device.

Description

Technical Field

[0001] This case relates to an electronic device, and more particularly to an electronic device for driving a load. Background Technology

[0002] In UPS (uninterruptible power supply) applications, the loads are typically inductive or mixed loads, such as servo motors, frequency converters, and electric motors. Generally, when the load switches or stops during operation, backflow energy may be generated. To protect the UPS power supply circuitry, this backflow energy needs to be effectively managed to avoid impacting the system.

[0003] Because traditional UPS applications often use unidirectional PFC (power factor correction) circuits, backflow energy cannot be released to the input source (such as the power grid or generator) through the PFC circuit. Therefore, additional circuitry (such as parallel resistors) is required to dissipate backflow energy and prevent overvoltage. However, this additional circuitry increases the overall system size and cost.

[0004] Therefore, the invention of an electronic device for driving loads that can improve upon the aforementioned existing technology is an urgent need at present. Summary of the Invention

[0005] The purpose of this invention is to provide an electronic device for driving a load that can use the reverse energy generated when the load is disabled to charge a backup power device or feed it back to the input source without the need for additional resistors to consume the reverse energy. Therefore, compared with existing methods, the overall system size and cost can be reduced.

[0006] To achieve the above objectives, this application provides an electronic device for driving a load, comprising a power factor corrector, a DC bus, an auxiliary circuit, and a conversion circuit. The power factor corrector receives drive power. The DC bus is connected in parallel with the power factor corrector and includes multiple capacitors connected in series. The auxiliary circuit is connected in parallel with the DC bus and includes a neutral point voltage, wherein the neutral point voltage is electrically coupled to a backup power device. The conversion circuit is connected in parallel with the auxiliary circuit and is used to drive the load. When the drive power comes from the backup power device and the load is disabled, generating reverse energy, the reverse energy flows into the auxiliary circuit. The electronic device operates the auxiliary circuit to allow the reverse energy to flow from the neutral point voltage to the backup power device.

[0007] To achieve the above objectives, this application also provides an electronic device for driving a load, comprising a power factor corrector, a DC bus, an auxiliary circuit, and a conversion circuit. The power factor corrector receives drive power. The DC bus is connected in parallel with the power factor corrector and includes multiple capacitors connected in series. The auxiliary circuit is connected in parallel with the DC bus. The conversion circuit is connected in parallel with the auxiliary circuit and is used to drive the load. When the drive power comes from an AC input source and the load is disabled, generating reverse energy, the reverse energy flows into the DC bus to charge the multiple capacitors; after being charged for a certain interval, the multiple capacitors discharge the power factor corrector, causing the reverse energy to flow into the AC input source. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the architecture of an electronic device according to an embodiment of this case;

[0009] Figure 2 This is a schematic diagram of the architecture of an electronic device according to another embodiment of this case;

[0010] Figure 3 for Figure 2 A schematic diagram of the circuit structure of an electronic device;

[0011] Figure 4 for Figure 3 A schematic diagram of an electronic device operating in the first AC mode;

[0012] Figure 5 for Figure 3 A schematic diagram of an electronic device operating in the second AC mode;

[0013] Figure 6 for Figure 3 A schematic diagram of an electronic device operating in the first DC mode;

[0014] Figure 7 for Figure 3 A schematic diagram of an electronic device operating in the second DC mode;

[0015] Figure 8 for Figure 3 A schematic diagram of an electronic device operating in hybrid mode;

[0016] Figure 9 , Figure 10 and Figure 11 for Figure 8 A waveform diagram of the first current provided by the AC input source and the third current provided by the backup power unit under different applicable scenarios of the hybrid mode;

[0017] Figure 12 for Figure 3 A schematic diagram of the circuit structure of an example of a variation of an electronic device;

[0018] Figure 13 , Figure 14 , Figure 15 and Figure 16 exemplify Figure 12 The auxiliary circuit using a full-bridge structure controls the power flow and switching action during bidirectional buck-boosting.

[0019] Explanation of icon numbers

[0020] 1: Electronic devices

[0021] 2: Load

[0022] 11: Power Factor Corrector

[0023] 12: DC bus

[0024] 13: Auxiliary Circuit

[0025] 14: Conversion Circuit

[0026] 3: Input Source

[0027] 15: Backup power equipment

[0028] S1, S2, S3, S4, S5, S6: Switches

[0029] C1, C2: Capacitors

[0030] S7, S8: Switches

[0031] L1: Inductor

[0032] RL1: Relay

[0033] Vm: Midpoint voltage

[0034] S9, S10, S11, S12, S13, S14: Switches

[0035] 16: Relay group

[0036] 17: Inductor group

[0037] 18: Thyristor assembly

[0038] 19: Capacitor Bank

[0039] TR: Transformer

[0040] 20: Capacitor bank

[0041] P1: First power

[0042] P2: Second power

[0043] V1: First voltage

[0044] I1: First current

[0045] V2: Second voltage

[0046] I2: Second current

[0047] P3: Third Power

[0048] V3: Third voltage

[0049] I3: Third Current

[0050] Iset: Preset value

[0051] S15, S16: Switches Detailed Implementation

[0052] Some typical embodiments embodying the features and advantages of this invention will be described in detail in the following section. It should be understood that this invention can have various variations in different embodiments, all of which do not depart from the scope of this invention.

[0053] Figure 1 This is a schematic diagram of the architecture of an electronic device according to an embodiment of this case. Figure 1 As shown, electronic device 1 is suitable for driving load 2, where load 2 can be, for example, but not limited to, an inductive load, meaning a load containing inductive elements, such as, but not limited to, motors and elevators. Electronic device 1 includes a power factor corrector (i.e., a DC bus 12), an auxiliary circuit 13, and a conversion circuit 14. The power factor corrector 11 is used to receive drive power and is bidirectional. Additionally, the power factor corrector 11 is also used to stabilize and control the power factor and the voltage of the DC bus 12. In this embodiment, the power factor corrector 11 is connected to an AC input source 3, and the drive power received by the power factor corrector 11 comes from the AC input source 3, where the AC input source 3 can be, for example, but not limited to, the power grid or a generator. The DC bus 12 is connected in parallel with the power factor corrector 11 and includes multiple capacitors connected in series. The auxiliary circuit 13 is connected in parallel with the DC bus 12 and is bidirectional. The conversion circuit 14 is connected in parallel with the auxiliary circuit 13 and is bidirectional, whereby the conversion circuit 14 is used to drive load 2.

[0054] In this embodiment, electronic device 1 can switch between a first AC mode and a second AC mode. Specifically, when load 2 is powered and consumes energy, electronic device 1 operates in the first AC mode. In the first AC mode, the power factor corrector 11 of electronic device 1 receives drive power from AC input source 3, and the conversion circuit 14 of electronic device 1 supplies power to load 2 to drive load 2. In this first AC mode, the power factor corrector 11 maintains the power factor within a preset specification and draws energy from AC input source 3 to stably maintain the voltage on DC bus 12.

[0055] Furthermore, when load 2 is disabled and reverse energy is generated, electronic device 1 operates in a second AC mode. In the second AC mode, the reverse energy flows into the DC bus 12 and charges multiple capacitors on the DC bus 12. After being charged for a certain interval, the multiple capacitors on the DC bus 12 discharge the power factor corrector 11, thereby allowing the reverse energy to flow into the AC input source 3 via the power factor corrector 11. Thus, the power factor corrector 11 can feed back the reverse energy flowing to the DC bus 12 to the AC input source 3 to prevent the voltage of the DC bus 12 from rising excessively and causing overvoltage.

[0056] Figure 2 This is a schematic diagram of the architecture of an electronic device according to another embodiment of this case. Figure 2 In, with Figure 1 Components with similar functions and structures are represented by the same designation, and will not be described further here. For example... Figure 2 As shown, in this embodiment, the electronic device 1 further includes a backup power device 15, wherein the backup power device 15 is electrically coupled to the midpoint voltage of the auxiliary circuit 13 and is configured to provide DC backup power. The backup power device 15 may be implemented, for example, but not limited to, a battery or a supercapacitor. The electronic device 1 can switch between different modes, wherein, in addition to the aforementioned first AC mode and second AC mode, the electronic device 1 in this embodiment can also operate in a first DC mode, a second DC mode, or a hybrid mode.

[0057] When the driving power comes from the backup power unit 15 and the load 2 is powered and consumes energy, the electronic device 1 operates in a first DC mode. In the first DC mode, the power factor corrector 11 receives driving power from the backup power unit 15, and the conversion circuit 14 supplies power to the load 2 to drive the load 2. For example, when the voltage or frequency of the AC power supplied by the AC input source 3 exceeds a preset range, the electronic device 1 can operate in the first DC mode to supply power to the load 2 based on the driving power from the backup power unit 15.

[0058] When the driving power comes from the backup power unit 15 and the load 2 is disabled, generating reverse energy, the electronic device 1 operates in the second DC mode. In the second DC mode, the reverse energy flows into the auxiliary circuit 13, and the electronic device 1 operates the auxiliary circuit 13 to make the reverse energy flow from the midpoint voltage of the auxiliary circuit 13 to the backup power unit 15.

[0059] Furthermore, when electronic device 1 operates in hybrid mode, load 2 is powered and consumes energy. Electronic device 1 receives drive power from AC input source 3 and simultaneously receives power from backup power device 15 via auxiliary circuit 13. The power supplied by electronic device 1 to load 2 comes from AC input source 3 and backup power device 15. For example, when electronic device 1 operates in first AC mode, if the current of AC input source 3 has reached a preset value, electronic device 1 can switch to hybrid mode to allow backup power device 15 to provide partial power, thereby reducing the current stress on the components in power factor correction device 11. Additionally, when electronic device 1 operates in first AC mode, if it is necessary to check the health and discharge curve of backup power device 15, electronic device 1 can switch to hybrid mode to allow backup power device 15 to discharge, thereby determining its health based on the power supplied by backup power device 15. Furthermore, during the transition of electronic device 1 from the first DC mode to the first AC mode (i.e., the drive power switches from the backup power device 15 to the AC input source 3), electronic device 1 can operate in a hybrid mode to make the power transfer process smoother. This avoids a drop in voltage and frequency of the AC input source 3 due to instantaneous power transfer, preventing a smooth switch back to the first AC mode. It should be noted that the application scenarios of the hybrid mode are not limited to those described above.

[0060] Figure 3 for Figure 2 A schematic diagram of the circuit structure of an electronic device. Figure 3 In, with Figure 2 Components with similar functions and structures are represented by the same designation, and will not be described further here. For example... Figure 3 As shown, in this embodiment, the power factor corrector 11 includes switches S1, S2, S3, S4, S5, and S6. Switches S1 and S2 connected in series form a switch bridge arm; switches S3 and S4 connected in series form a switch bridge arm; and switches S5 and S6 connected in series form a switch bridge arm. The connection points between switches S1 and S2, S3 and S4, and S5 and S6 are respectively connected to the corresponding phases of the AC input source 3. Switches S1, S2, S3, S4, S5, and S6 can be, for example, IGBTs (insulated gate bipolar transistors), forming a three-phase, two-level, full-bridge, bidirectional power factor corrector. The DC bus 12 includes capacitors C1 and C2 connected in series, and the capacitor bridge arm formed by capacitors C1 and C2 is connected in parallel to each switch bridge arm of the power factor corrector 11.

[0061] Auxiliary circuit 13 includes switches S7 and S8, inductor L1, and relay RL1. Switches S7 and S8, connected in series, form a switch bridge arm connected in parallel to the capacitor bridge arm of DC bus 12. The first terminal of inductor L1 is electrically connected to the connection point between switches S7 and S8, and the second terminal of inductor L1 is electrically connected to the first terminal of relay RL1. The second terminal of relay RL1 is electrically connected to the positive terminal of backup power device 15. The connection point between switches S7 and S8 has a midpoint voltage Vm. For example, switches S7 and S8 may be IGBTs, and auxiliary circuit 13 forms a half-bridge bidirectional buck-boost converter. In some embodiments, relay RL1 is turned off when backup power device 15 fails, backup power device 15 is removed, or the voltage of backup power device 15 is too low, and remains on at other times.

[0062] The conversion circuit 14 includes switches S9, S10, S11, S12, S13, and S14. Switches S9 and S10 connected in series form a switch bridge arm; switches S11 and S12 connected in series form a switch bridge arm; and switches S13 and S14 connected in series form a switch bridge arm. Switches S9, S10, S11, S12, S13, and S14 can be, for example, IGBTs, forming a three-phase two-level full-bridge bidirectional converter for DC-AC or AC-DC power conversion. It should be noted that one end of each capacitor bridge arm and switch bridge arm in the power factor corrector 11, DC bus 12, auxiliary circuit 13, and conversion circuit 14 is connected, and the other end of each capacitor bridge arm and switch bridge arm is connected to the negative terminal of the backup power device 15.

[0063] In some embodiments, the electronic device 1 further includes a relay group 16, an inductor group 17, a thyristor group 18, and a capacitor group 19. The relay group 16 is electrically connected between the AC input source 3 and the power factor corrector 11, and is configured to control the connection between the AC input source 3 and the power factor corrector 11, and includes multiple relays. In the relay group 16, a first terminal of each relay is electrically connected to a corresponding phase of the AC input source 3, and a second terminal of each relay is electrically connected to a connection point between the switches of a corresponding switch arm in the power factor corrector 11. The inductor group 17 is electrically connected between the relay group 16 and the power factor corrector 11, and includes multiple inductors, wherein a first terminal of each inductor is electrically connected to a corresponding relay in the relay group 16, and a second terminal of each inductor is electrically connected to a connection point between the switches of a corresponding switch arm in the power factor corrector 11. A thyristor group 18 is electrically connected between the backup power unit 15 and the power factor corrector 11, and includes multiple thyristors. The anode of each thyristor is electrically connected to the positive terminal of the backup power unit 15, and the cathode of each thyristor is electrically connected to the corresponding relay in the relay group 16 and the corresponding inductor in the inductor group 17. The thyristors in the thyristor group 18 can be, for example, but not limited to, silicon controlled rectifiers. When the driving power comes from the backup power unit 15, the thyristor group 18 is turned on (i.e., all thyristors in the thyristor group 18 are turned on); and when the driving power comes from the AC input source 3, the thyristor group 18 is turned off (i.e., all thyristors in the thyristor group 18 are turned off), thus blocking AC power between the backup power unit 15, the power factor corrector 11, and the AC input source 3. A capacitor group 19 is electrically connected to the AC input source 3 and is used for filtering, and includes multiple capacitors. In the capacitor group 19, the first terminal of each capacitor is electrically connected to the corresponding phase of the AC input source 3, and the second terminals of all capacitors are connected together.

[0064] In some embodiments, the electronic device 1 further includes a transformer TR and a capacitor bank 20. One side of the transformer TR is electrically connected to the connection point between the switches of each switching bridge arm in the conversion circuit 14, and the other side of the transformer TR is electrically connected to the load 2. The capacitor bank 20 is electrically connected to the load 2 and is used for filtering, and includes multiple capacitors. In the capacitor bank 20, the first terminal of each capacitor is electrically connected to the corresponding phase between the transformer TR and the load 2, and the second terminals of all capacitors are connected together.

[0065] It should be noted that, Figure 3 The circuit topology of the electronic device 1 shown is only an example, and the specific implementation of the electronic device in this case is not limited thereto.

[0066] The following is Figure 3 Taking the circuit topology of the electronic device 1 shown as an example, the various operating modes of the electronic device 1 will be explained in detail.

[0067] Figure 4 for Figure 3 A schematic diagram of electronic device 1 operating in the first AC mode, wherein... Figure 3 Components with similar functions and structures are represented by the same designation, and will not be described further here. Figure 4 In the diagram, arrows indicate the direction of power flow. It should be noted that, for simplicity, the power flow shown only passes through specific switching arms in the power factor corrector 11 and conversion circuit 14; however, in reality, the power flows through all switching arms in the power factor corrector 11 and conversion circuit 14. The same applies to the power flow directions shown in subsequent figures. Figure 4 As shown, when electronic device 1 operates in the first AC mode, relay group 16 is turned on, load 2 is energized and consumes energy, power factor corrector 11 receives first power P1 from AC input source 3 as driving power and keeps the voltage of DC bus 12 stable. At the same time, conversion circuit 14 maintains a stable output voltage, enabling electronic device 1 to provide a stable second power P2 to load 2. In the first AC mode, both first power P1 and second power P2 are positive values. The figure illustrates the waveforms of the first voltage V1 and first current I1 of first power P1, and the waveforms of the second voltage V2 and second current I2 of second power P2.

[0068] Figure 5 for Figure 3 A schematic diagram of electronic device 1 operating in the second AC mode, wherein... Figure 3 Components with similar functions and structures are represented by the same designation, and will not be described further here. Figure 5 In the diagram, arrows indicate the direction of power flow. For example... Figure 5 As shown, when electronic device 1 operates in the second AC mode, relay group 16 is turned on, load 2 is disabled, and reverse energy is generated. At this time, the second power P2 is negative and flows into the electronic device 1. Specifically, the second power P2 flows into the DC bus 12 to charge capacitors C1 and C2. After capacitors C1 and C2 are charged for a period of time, they discharge the power factor corrector 11, causing the power factor corrector 11 to provide the first power P1 to the AC input source 3. That is, the first power P1 received by the power factor corrector 11 from the AC input source 3 is negative. Thus, the power factor corrector 11 can feed back the reverse energy flowing to the DC bus 12 to the AC input source 3 to avoid excessive voltage rise in the DC bus 12 and overvoltage. In the second AC mode, both the first power P1 and the second power P2 are negative. The figure illustrates the waveforms of the first voltage V1 and the first current I1 of the first power P1, and the waveforms of the second voltage V2 and the second current I2 of the second power P2. In addition, based on Figure 5 As can be seen, in traditional UPS applications, because a unidirectional power factor corrector is used, when reverse energy is fed back to the DC bus, the reverse energy cannot be further fed back to the AC input source through the power factor corrector. Therefore, an additional parallel resistor must be connected to the DC bus to consume energy and avoid overvoltage.

[0069] Figure 6 for Figure 3 A schematic diagram of electronic device 1 operating in the first DC mode, wherein... Figure 3 Components with similar functions and structures are represented by the same designation, and will not be described further here. Figure 6 In the diagram, arrows indicate the direction of power flow. For example... Figure 6 As shown, when electronic device 1 operates in the first DC mode, relay group 16 is turned off, load 2 is energized and consumes energy, backup power device 15 discharges to provide third power P3, power factor corrector 11 receives third power P3 from backup power device 15 as drive power and keeps the voltage of DC bus 12 stable. At the same time, conversion circuit 14 maintains a stable output voltage, enabling electronic device 1 to provide stable second power P2 to load 2. In the first DC mode, both second power P2 and third power P3 are positive values. The figure illustrates the waveforms of the second voltage V2 and second current I2 of second power P2, and the waveforms of the third voltage V3 and third current I3 of third power P3.

[0070] Figure 7 for Figure 3 A schematic diagram of electronic device 1 operating in the second DC mode, wherein... Figure 3 Components with similar functions and structures are represented by the same designation, and will not be described further here. Figure 7 In the diagram, arrows indicate the direction of power flow. For example... Figure 7 As shown, when electronic device 1 operates in the second DC mode, relay group 16 is turned off, load 2 is disabled, and reverse energy is generated. At this time, the second power P2 is negative and flows into the electronic device 1. Specifically, the second power P2 flows into the auxiliary circuit 13. Electronic device 1 controls relay RL1 to conduct by operating the auxiliary circuit 13, and controls switches S7 and S8 to conduct alternately, so that the reverse energy flows from the midpoint voltage Vm of the auxiliary circuit 13 through switch S7, inductor L1, and relay RL1 to the backup power device 15 to form the third power P3. At this time, the third power P3 is negative and charges the backup power device 15. Thus, the reverse energy can be used to charge the backup power device 15 through the auxiliary circuit 13 to consume the reverse energy. In the second DC mode, both the second power P2 and the third power P3 are negative. The figure illustrates the waveforms of the second voltage V2 and the second current I2 of the second power P2, and the waveforms of the third voltage V3 and the third current I3 of the third power P3.

[0071] Figure 8 for Figure 3 A schematic diagram of electronic device 1 operating in hybrid mode, wherein... Figure 3 Components with similar functions and structures are represented by the same designation, and will not be described further here. Figure 8In the diagram, arrows indicate the direction of power flow. For example... Figure 8 As shown, when electronic device 1 operates in hybrid mode, relay group 16 is turned on, and load 2 is enabled and consumes energy. At this time, power factor correction device 11 receives first power P1 from AC input source 3 as drive power, and the drive power is provided to conversion circuit 14 via power factor correction device 11. Simultaneously, backup power device 15 discharges to provide third power P3, which is provided to conversion circuit 14 via auxiliary circuit 13. At this time, relay RL1 is turned on, and switches S7 and S8 are alternately turned on. Conversion circuit 14 supplies power to load 2 based on drive power and backup power device 15.

[0072] The following is based on Figure 8 Matching Figure 9 , Figure 10 and Figure 11 Examples illustrate the applicable scenarios for several hybrid modes, among which Figure 9 , Figure 10 and Figure 11 for Figure 8 The diagram shows the waveforms of the first current I1 provided by AC input source 3 and the third current I3 provided by backup power device 15 under different applicable scenarios of the hybrid mode. It should be noted that the applicable scenarios of the hybrid mode are not limited to these.

[0073] Please see Figure 8 and paired Figure 9 In some embodiments, when the peak value of the first current I1 provided by the AC input source 3 reaches a preset value Iset (e.g., output overload), the backup power unit 15 can provide part of the power required by the electronic device 1 to supply power to the load 2. This reduces the current stress on the components in the power factor corrector 11 during output overload. Furthermore, in the case where the AC input source 3 is a generator, the power burden on the generator can be reduced.

[0074] Please see Figure 8 and paired Figure 10In some embodiments, when electronic device 1 switches from a first DC mode to a first AC mode, the instantaneous power transfer may cause the voltage and frequency of the AC input source 3 (e.g., a generator) to drop beyond a preset range, thus preventing electronic device 1 from operating in the first AC mode. Therefore, electronic device 1 can operate in a hybrid mode during the transition period to make the power transfer process smoother. Specifically, electronic device 1 can first switch from the first DC mode to the hybrid mode, and then switch from the hybrid mode back to the first AC mode. For example, during the operation of electronic device 1 in the hybrid mode, the peak value of the first current I1 gradually increases, causing the first power P1 (i.e., the driving power) received by the power factor corrector 11 from the AC input source 3 to gradually increase, while the third current I3 decreases as the peak value of the first current I1 increases, causing the third power P3 provided by the backup power device 15 to gradually decrease. This achieves a smooth transition in power transfer. It should be noted that during the transition period of electronic device 1 in the hybrid mode, the actual variation range of the first current I1 and the third current I3 can be determined according to actual needs and is not limited in this application.

[0075] Please see Figure 8 and paired Figure 11 In some embodiments, when electronic device 1 is operating in the first AC mode, if it is necessary to check the health and discharge curve of backup power device 15, electronic device 1 can switch to a hybrid mode to allow backup power device 15 to discharge with a specific current. In this case, power factor corrector 11 adjusts the peak value of the first current I1 from AC input source 3 accordingly, so that backup power device 15 discharges with a specific current, while simultaneously maintaining a stable second power P2 supplied by electronic device 1 to load 2.

[0076] Furthermore, in the foregoing embodiments, the auxiliary circuit 13 all employs a half-bridge structure; however, the actual implementation of the auxiliary circuit is not limited to this. In some embodiments, such as... Figure 12 As shown, the auxiliary circuit 13 can also adopt a full-bridge structure. In this embodiment, in addition to switches S7 and S8 and inductor L1, the auxiliary circuit 13 also includes switches S15 and S16. The first terminal of switch S15 is electrically connected to the positive terminal of the backup power device 15, the second terminal of switch S15 is electrically connected to the second terminal of inductor L1 and the first terminal of switch S16, and the second terminal of switch S16 is electrically connected to the negative terminal of the backup power device 15. Furthermore, the full-bridge structure of the auxiliary circuit 13 can realize bidirectional buck-boost, such as bidirectional buck-boost between the DC bus 12 and the backup power device 15, thus increasing voltage selectivity flexibility.

[0077] Taking the bidirectional step-up / step-down voltage between DC bus 12 and backup power unit 15 as an example, the following will use... Figures 13 to 16This illustration demonstrates how bidirectional step-up and step-down voltage can be achieved through auxiliary circuit 13. For the sake of simplicity, only DC bus 12, auxiliary circuit 13, and backup power device 15 are shown in the figure.

[0078] Figure 13 The diagram illustrates the power flow (indicated by dashed arrows) and switching operation when the auxiliary circuit 13 steps down the power from the DC bus 12 and supplies it to the backup power device 15. During the step-down process, switches S7 and S8 are alternately turned on, switch S15 remains on, and switch S16 remains off. Specifically, when switches S7 and S15 are on and switches S8 and S16 are off, the DC bus 12 supplies power to the backup power device 15 via the auxiliary circuit 13, and inductor L1 stores energy; when switches S8 and S15 are on and switches S7 and S16 are off, inductor L1 releases energy to smooth out power fluctuations. Thus, the auxiliary circuit 13 steps down the power from the DC bus 12 and supplies it to the backup power device 15. Figure 14 The diagram illustrates the power flow and switching operation when the auxiliary circuit 13 boosts the power from the backup power device 15 and supplies it to the DC bus 12. During the boosting process, switches S7 and S8 are alternately turned on, switch S15 remains on, and switch S16 remains off. Specifically, when switches S8 and S15 are on and switches S7 and S16 are off, inductor L1 stores energy; when switches S7 and S15 are on and switches S8 and S16 are off, the backup power device 15 supplies power to the DC bus 12, and inductor L1 also releases energy to the DC bus 12. Thus, the auxiliary circuit 13 steps down the power from the backup power device 15 and supplies it to the DC bus 12.

[0079] Figure 15 The diagram illustrates the power flow and switching operation when the auxiliary circuit 13 boosts the power from the DC bus 12 and supplies it to the backup power device 15. During the boosting process, switch S7 remains on, switch S8 remains off, and switches S15 and S16 alternately turn on. Specifically, when switches S7 and S16 are on and switches S8 and S15 are off, inductor L1 stores energy; when switches S7 and S15 are on and switches S8 and S16 are off, the DC bus 12 supplies power to the backup power device 15, and inductor L1 also releases energy to the backup power device 15. Thus, the auxiliary circuit 13 boosts the power from the DC bus 12 and supplies it to the backup power device 15. Figure 16The diagram illustrates the power flow and switching operation when the auxiliary circuit 13 steps down the power from the backup power device 15 and supplies it to the DC bus 12. During the step-down process, switch S7 remains on, switch S8 remains off, and switches S15 and S16 alternately turn on. Specifically, when switches S7 and S15 are on and switches S8 and S16 are off, the backup power device 15 supplies power to the DC bus 12 via the auxiliary circuit 13, and inductor L1 stores energy; when switches S7 and S16 are on and switches S8 and S15 are off, inductor L1 releases energy to smooth out power fluctuations. Thus, the auxiliary circuit 13 steps down the power from the backup power device 15 and supplies it to the DC bus 12.

[0080] Furthermore, when electronic device 1 operates in the second DC mode and load 2 is disabled, generating reverse energy, auxiliary circuit 13 can... Figure 13 The switching operation will step down the reverse energy and supply it to the backup power unit 15, or through... Figure 15 The switching operation will boost the reverse energy and supply it to the backup power unit 15.

[0081] It should be noted that the above are merely preferred embodiments for illustrating this case, and this case is not limited to the described embodiments. The scope of this case is determined by the scope of the appended claims. Furthermore, those skilled in the art may make various modifications to this case, but all such modifications will not depart from the scope of protection sought by the appended claims.

Claims

1. An electronic device for driving a load, comprising: Power factor corrector, used to receive drive power; A DC bus, in parallel with the power factor corrector, and containing multiple capacitors connected in series; An auxiliary circuit, connected in parallel to the DC bus, and including a midpoint voltage, wherein the midpoint voltage is electrically coupled to a backup power unit; and A conversion circuit, connected in parallel with the auxiliary circuit, is used to drive the load; and When the driving power comes from the backup power device and the load is disabled, generating reverse energy, the reverse energy flows into the auxiliary circuit. The electronic device operates the auxiliary circuit to allow the reverse energy to flow from the midpoint voltage to the backup power device.

2. The electronic device according to claim 1, wherein the auxiliary circuit comprises a first switch, a second switch, an inductor, and a relay; the switch bridge arm formed by the series connection of the first switch and the second switch is connected in parallel to the DC bus; the two ends of the inductor are respectively electrically connected to the connection point between the first switch and the second switch and the first end of the relay; the second end of the relay is electrically connected to the positive end of the backup power device; the negative end of the backup power device is electrically connected to the second switch; and the midpoint voltage is the voltage at the connection point between the first switch and the second switch.

3. The electronic device according to claim 2, wherein when the driving power comes from the backup power device and the load is disabled to generate reverse energy, the electronic device controls the relay to turn on and controls the first switch and the second switch to turn on alternately, so that the reverse energy flows to the backup power device via the auxiliary circuit.

4. The electronic device according to claim 1, wherein the auxiliary circuit comprises a first switch, a second switch, a third switch, a fourth switch, and an inductor; the switch bridge arm formed by the series connection of the first switch and the second switch is connected in parallel to the DC bus; the connection point between the first switch and the second switch is electrically connected to the first end of the inductor; the first end of the third switch is electrically connected to the positive end of the backup power device; the second end of the third switch is electrically connected to the second end of the inductor and the first end of the fourth switch; the second end of the fourth switch is electrically connected to the negative end of the backup power device and the second switch; the midpoint voltage is the voltage at the connection point between the first switch and the second switch.

5. The electronic device according to claim 4, wherein when the driving power comes from the backup power device and the load is disabled to generate reverse energy, the electronic device controls the first switch and the second switch to be turned on alternately, controls the third switch to remain on, and controls the fourth switch to remain off, so that the reverse energy flows to the backup power device after being stepped down by the auxiliary circuit.

6. The electronic device according to claim 4, wherein when the driving power comes from the backup power device and the load is disabled to generate reverse energy, the electronic device controls the third switch and the fourth switch to be turned on alternately, controls the first switch to remain on, and controls the second switch to remain off, so that the reverse energy flows to the backup power device after being boosted by the auxiliary circuit.

7. The electronic device of claim 1, wherein when the drive power is from an AC input source and the load is disabled to generate the reverse energy, the reverse energy flows into the DC bus to charge the plurality of capacitors; the plurality of capacitors discharge the power factor corrector after a charging interval, so that the reverse energy flows into the AC input source.

8. The electronic device of claim 1, wherein the drive power is derived from an AC input source or the backup power device, and the power factor corrector is configured to receive the drive power from the backup power device when the voltage or frequency of the AC input source exceeds a preset range.

9. The electronic device according to claim 1, wherein when the driving power comes from an AC input source and the peak current of the AC input source reaches a preset value, the electronic device simultaneously receives electrical energy from the backup power device via the auxiliary circuit.

10. The electronic device according to claim 1, wherein when the driving power comes from an AC input source, the electronic device simultaneously receives electrical energy from the backup power device via the auxiliary circuit, and determines the health status of the backup power device based on the electrical energy.

11. The electronic device of claim 1, wherein the driving power is derived from an AC input source or the backup power device, during the transition period when the electronic device switches from receiving the driving power from the backup power device to receiving the driving power from the AC input source, the electronic device receives the driving power from the AC input source and simultaneously receives electrical energy from the backup power device via the auxiliary circuit, and during the transition period, the power of the driving power gradually increases and the power of the electrical energy provided by the backup power device gradually decreases accordingly.

12. The electronic device of claim 1, wherein the drive power is derived from an AC input source or the backup power device, and the electronic device further comprises a relay group electrically connected between the AC input source and the power factor corrector, and configured to control the connection between the AC input source and the power factor corrector.

13. The electronic device of claim 1, wherein the drive power is from an AC input source or the backup power device, the electronic device further comprising a thyristor assembly electrically connected between the backup power device and the power factor corrector; the thyristor assembly is configured to be turned on when the drive power is from the backup power device and turned off when the drive power is from the AC input source.

14. An electronic device for driving a load, comprising: Power factor corrector, used to receive drive power; A DC bus, in parallel with the power factor corrector, and containing multiple capacitors connected in series; Auxiliary circuitry, connected in parallel to the DC bus; and The conversion circuit, connected in parallel with the auxiliary circuit, is used to drive the load. When the drive power comes from an AC input source and the load is disabled, generating reverse energy, the reverse energy flows into the DC bus to charge the plurality of capacitors; after a charging interval, the plurality of capacitors discharge the power factor corrector, causing the reverse energy to flow into the AC input source.

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