Power conversion system

Abstract

A power conversion system includes a DC / DC conversion circuit, an energy tank, a switch, and a controller. The DC / DC conversion circuit converts the first DC power into second DC power and supplies the second DC power to the dynamic load. The energy tank is coupled to the DC / DC conversion circuit. The switch is coupled between the energy tank and the DC / DC conversion circuit. The controller is coupled to the energy tank and the switch, and detects a first voltage of the first DC power and a second voltage of the second DC power, respectively, to determine a change in the dynamic load. When the controller detects that the first voltage is lower than the first default voltage or the second voltage is lower than the second default voltage, the controller turns on the switch, so that the third direct-current power stored in the energy tank is supplied to the direct-current / direct-current conversion circuit, and the first direct-current power or the second direct-current power is compensated.

Description

Technical Field

[0001] The present invention relates to an electronic system. Specifically, the present invention relates to a power conversion system for compensating for dynamic loads. Background Art

[0002] The computing mode of today's servers adopts centralized computing mode, and the energy changes required can easily cause the protection mechanism of the power supply to start, which in turn causes the server to crash. The operating mode of the power converter on the market is to increase the frequency response of the load to slow down the voltage drop at the bus end, so that the output voltage of the DC / DC measurement meets the specification, but it causes the current distortion on the AC side, which affects the harmonic components of the power grid.

[0003] Therefore, the above technology still has many defects, and practitioners in this field need to develop other suitable power conversion systems. Summary of the invention

[0004] One aspect of the present case relates to a power conversion system. The power conversion system includes a DC / DC conversion circuit, an energy tank, a switch, and a controller. The DC / DC conversion circuit is used to convert a first DC power into a second DC power, and provide the second DC power to a dynamic load. The energy tank is coupled to the DC / DC conversion circuit. The switch is coupled between the energy tank and the DC / DC conversion circuit. The controller is coupled to the energy tank and the switch, and is used to detect a first voltage of the first DC power and a second voltage of the second DC power, respectively, to determine changes in the dynamic load. When the controller detects that the first voltage is lower than the first default voltage or detects that the second voltage is lower than the second default voltage, the controller is used to turn on the switch so that the third DC power stored in the energy tank is provided to the DC / DC conversion circuit to compensate for one of the first DC power and the second DC power.

[0005] Another aspect of the present case relates to a power conversion system. The power conversion system includes a DC / DC conversion circuit, an energy tank, a first bidirectional conversion circuit and a controller. The DC / DC conversion circuit is used to convert a first DC power into a second DC power, and provide the second DC power to a dynamic load. The energy tank is coupled to the DC / DC conversion circuit. The first bidirectional conversion circuit is coupled between the energy tank and the DC / DC conversion circuit. The controller is coupled to the energy tank and the first bidirectional conversion circuit, and is used to respectively detect a first voltage of the first DC power and a second voltage of the second DC power to determine changes in the dynamic load. When the controller detects that the first voltage is lower than the first default voltage or detects that the second voltage is lower than the second default voltage, the controller is used to turn on the first bidirectional conversion circuit so that the third DC power stored in the energy tank is provided to the DC / DC conversion circuit to compensate for one of the first DC power and the second DC power.

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a power conversion system. When dynamic load changes occur, even if the power factor correction circuit (PFC) response is insufficient to pull the bus terminal voltage up to the maximum gain, the design of the power conversion system of the present invention buffers the voltage drop at the output end of the system to meet the specifications, and does not increase the current distortion on the AC side and affect the harmonic components of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The content of this case can be better understood by referring to the embodiments in the subsequent paragraphs and the following drawings:

[0008] Figure 1 is a circuit diagram of a power conversion system according to some embodiments of the present invention;

[0009] Figure 2 Schematic diagram of bus terminal voltage and output voltage of a power conversion system according to some embodiments of the present invention;

[0010] Figure 3 is a circuit diagram of a power conversion system according to some embodiments of the present invention;

[0011] Figure 4 Schematic diagram of bus terminal voltage and output voltage of a power conversion system according to some embodiments of the present invention;

[0012] Figure 5 is a circuit diagram of a power conversion system according to some embodiments of the present invention;

[0013] Figure 6 Schematic diagram of bus terminal voltage and output voltage of a power conversion system according to some embodiments of the present invention;

[0014] Figure 7 A schematic diagram of a bidirectional conversion circuit of a power conversion system according to some embodiments of the present invention;

[0015] Figure 8 is a circuit diagram of a power conversion system according to some embodiments of the present invention;

[0016] Fig. 9 is a circuit diagram of a power conversion system according to some embodiments of the present invention;

[0017] Fig.10 is a circuit diagram of a power conversion system according to some embodiments of the present invention;

[0018] Fig.11 is a circuit diagram of a power conversion system according to some embodiments of the present invention;

[0019] Fig.12 is a circuit diagram of a power conversion system according to some embodiments of the present invention;

[0020] Fig.13 A circuit diagram of a power conversion system according to some embodiments of the present invention; and

[0021] Fig.14 It is a circuit diagram of a power conversion system according to some embodiments of the present invention.

[0022] Description of Figure Numbers

[0023] 100,200,300,400,500,600,700,800,100A,200A: Power conversion system

[0024] 110,210,310,410,510,610,710,810,110A,210A: DC / DC conversion circuit

[0025] 120,220,320,420,520,620,720,820,120A,220A: Energy slot

[0026] 130,230,330,430,530,630,730,830,130A,230A: Controller

[0027] 240,240A,540,640,740,840,850: Bidirectional conversion circuit

[0028] 750,860: Energy storage circuit

[0029] SW1: Switch

[0030] T1~T4: Transistor

[0031] S1~S4: control signal

[0032] LW: FireWire

[0033] EW: Ground

[0034] R: Load

[0035] CBUS,CO: Capacitor

[0036] AC: alternating current power

[0037] PFC: Power Factor Correction Circuit

[0038] PU: Power Unit

[0039] CU: Compensation unit

[0040] VBUS: bus terminal voltage

[0041] VO: Output voltage

[0042] V1, V2: default voltage DETAILED DESCRIPTION

[0043] The spirit of the present invention will be clearly illustrated below with the accompanying drawings and detailed descriptions. After understanding the embodiments of the present invention, any technician in the relevant technical field can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0044] The computing mode of today's servers adopts centralized computing mode, and the energy changes required can easily cause the protection mechanism of the power supply to start, which in turn causes the server to crash. The operating mode of the power converter on the market is to increase the frequency response of the load to slow down the voltage drop at the bus end, so that the output voltage of the DC / DC measurement meets the specification, but it causes the current distortion on the AC side, which affects the harmonic components of the power grid.

[0045] Figure 1 1 is a circuit diagram of a power conversion system 100 according to some embodiments of the present invention. The power conversion system 100 includes a power device PU. In one embodiment, the power device PU may be a power converter, which can convert power from one form to another. As an example, power is converted from alternating current (AC) to direct current (DC), from direct current to alternating current, from alternating current to alternating current, or from direct current to direct current. In addition, the power converter can convert power from one voltage level to another voltage level. The subsequent content of this case will describe how to improve the above problems.

[0046] In one embodiment, the power device PU includes a DC / DC converter circuit 110, an energy tank 120, a controller 130, a switch SW1, and a power factor correction circuit PFC. The power factor correction circuit PFC is coupled to an AC power source AC. The input terminals of the DC / DC converter circuit 110 are electrically connected to bus terminals (i.e., capacitors C BUS The output terminal of the DC / DC conversion circuit 110 (i.e., the capacitor C O The switch SW1 is electrically connected between the output end of the DC / DC conversion circuit 110 and the energy tank 120. The controller 130 is electrically connected to the output end of the DC / DC conversion circuit 110 (i.e., the capacitor C OThe voltage outputted by the output terminal of the DC / DC conversion circuit 110 is within the default safety voltage range. In one embodiment, the load R represents the resistance of one or more electronic systems (such as a server). The more electronic systems there are, the lower the resistance of the load R.

[0047] In one embodiment, the power factor correction circuit PFC is used to adjust the input current of the subsequent load end according to the AC power source AC, so as to output DC power. The main purpose of the power factor correction circuit PFC is to make the input current close to the current of a pure resistive load.

[0048] In one embodiment, the DC / DC converter circuit 110 is used to convert a DC power source into a DC (or near-DC) power source of different voltages, the power range of which can be from a small battery to a high voltage power source. BUS The DC power at the output end (i.e. capacitor C O The DC power at the bus terminal and the output terminal is different.

[0049] In one embodiment, the energy tank 120 may be various types of energy storage components, such as lithium battery packs, super capacitors, electrolytic capacitors, and the like.

[0050] In one embodiment, the switch SW1 may be a bipolar junction transistor (BJT) and a metal-oxide-semiconductor field-effect transistor (MOSFET).

[0051] In one embodiment, the controller 130 may include but is not limited to a single processor and an integration of multiple microprocessors, such as a central processing unit (CPU) or an application specific integrated circuit (ASIC). In one embodiment, the controller 130 is used to detect the bus terminal (i.e., the capacitor C BUS The DC power at the output end (i.e., capacitor C O DC power at the place where the power is generated.

[0052] In one embodiment, to make Figure 1 The operation of the power conversion system 100 is easy to understand, please refer to Figure 2 . Figure 2 is the bus terminal voltage V of the power conversion system 100 according to some embodiments of the present invention. BUS (i.e., capacitance CBUS The voltage difference between the two ends) and the output voltage V O (i.e., capacitance C O See the diagram of the pressure difference between the two ends. Figure 1 and Figure 2 When the controller 130 detects that the DC power of the energy tank 120 is lower than the preset charge before the time point P1, the controller 130 generates a control signal to turn on the switch SW1, so that the DC / DC conversion circuit 110 charges the energy tank 120 to the output voltage V O When the energy tank 120 is charged to the output voltage V O The controller 130 turns off the switch SW1 when the voltage level or the default charge amount is reached.

[0053] Next, when the controller 130 detects the bus terminal voltage V at time point P1 BUS When the voltage is lower than the default voltage V1 (i.e., the load R is too large to cause a voltage drop), the controller 130 is used to generate a control signal to turn on the switch SW1, so that the DC power stored in the energy tank 120 is provided to the output end of the DC / DC conversion circuit 110 to compensate for the DC power at the output end (i.e., the output voltage V O Similarly, when the controller 130 detects the bus terminal voltage V at time point P2 BUS When the output voltage V1 is lower than the default voltage V1 again, the controller 130 will perform the above operation again to compensate the DC power at the output end of the DC / DC conversion circuit 110. O The dotted line represents the case where dynamic load variation occurs without compensation. The DC power stored in the energy tank 120 buffers the voltage drop at the output end of the system to meet the specification without increasing the current distortion on the AC side and affecting the harmonic components of the power grid.

[0054] In one embodiment, under normal load operation, the energy tank 120 adjusts the characteristics of the switch SW1, such as the active region of the bipolar junction transistor (BJT) or the linear region of the metal oxide semiconductor field effect transistor (MOSFET), so that the output end of the DC / DC converter circuit 110 can charge the energy tank 120 to the output voltage V O When a dynamic load is generated, the switch SW1 is operated in the saturation region and the power is fed from the energy tank 120 to the output end of the DC / DC conversion circuit 110, so that the output end can be buffered in large quantities, so that the output voltage V O The voltage drop becomes very slow, even if the power factor correction circuit PFC response is not enough to reduce the bus terminal voltage V BUS Pull back to the maximum gain of the DC / DC converter circuit 110 .

[0055] In one embodiment, see Figure 1 and Figure 2 The controller 130 may be configured to detect the DC power (ie, the output voltage V O If the output voltage V O When the voltage V2 is lower than the default voltage V2, the controller 130 will perform the above operation to compensate the DC power at the output end of the DC / DC conversion circuit 110. The detailed operation has been introduced in the above description paragraph and will not be repeated here.

[0056] Figure 3 1 is a circuit diagram of a power conversion system 100A according to some embodiments of the present invention. The power conversion system 100A includes a power device PU. The power device PU includes a DC / DC conversion circuit 110A, an energy tank 120A, a controller 130A, a switch SW1, and a power factor correction circuit PFC. The connection methods of the DC / DC conversion circuit 110A, the energy tank 120A, the controller 130A, the switch SW1, and the power factor correction circuit PFC are similar to Figure 1 The connection method of the corresponding components in the power device PU of the power conversion system 100 is described below. For the sake of simplicity, only the differences are described below.

[0057] In one embodiment, compared to Figure 1 The difference in the connection method is that the switch SW1 is electrically connected to the input end of the DC / DC conversion circuit 110 (equivalent to the bus end, that is, the capacitor C BUS (where).

[0058] In one embodiment, to make Figure 3 The operation of the power conversion system 100A is easy to understand, please refer to Figure 4 . Figure 4 is the bus terminal voltage V of the power conversion system 100A according to some embodiments of the present invention. BUS (i.e., capacitance C BUS The voltage difference between the two ends) and the output voltage V O (i.e., capacitance C O See the diagram of the pressure difference between the two ends. Figure 3 and Figure 4 When the controller 130A detects that the DC power of the energy tank 120A is lower than the preset charge before the time point P1, the controller 130A generates an operation signal to turn on the switch SW1, so that the DC / DC conversion circuit 110A charges the energy tank 120A to the output voltage V O When the energy tank 120A is charged to the output voltage V O The controller 130A turns off the switch SW1 when the voltage level or the default charge amount is reached.

[0059] Next, when the controller 130A detects the bus terminal voltage V at time point P1 BUS When the voltage is lower than the default voltage V1 (i.e., the load R is too large to cause a voltage drop), the controller 130A is used to generate an operation signal to turn on the switch SW1, so that the DC power stored in the energy tank 120A is provided to the input end of the DC / DC conversion circuit 110 to compensate for the DC power at the input end (i.e., the bus terminal voltage V BUS voltage level), thereby making the DC power at the output end (i.e., the output voltage V O Similarly, when the controller 130A detects the bus terminal voltage V at time point P2, BUS When the voltage is lower than the default voltage V1 again, the controller 130A will execute the above operation again to compensate the DC power at the input end of the DC / DC conversion circuit 110A.

[0060] In one embodiment, see Figure 3 and Figure 4 The controller 130A may be configured to detect the DC power (i.e., the output voltage V O If the output voltage V O When the voltage V2 is lower than the default voltage V2, the controller 130A will perform the above operation to compensate the DC power at the output end of the DC / DC conversion circuit 110A. The detailed operation has been introduced in the above description paragraph and will not be repeated here.

[0061] Figure 5 1 is a circuit diagram of a power conversion system 200 according to some embodiments of the present invention. The power conversion system 200 includes a power device PU. The power device PU includes a DC / DC conversion circuit 210, an energy tank 220, a controller 230, a bidirectional conversion circuit 240, and a power factor correction circuit PFC. The connection methods of the DC / DC conversion circuit 210, the energy tank 220, the controller 230, the bidirectional conversion circuit 240, and the power factor correction circuit PFC are similar to Figure 1 The connection method of corresponding components in the power device PU of the power conversion system 100 is shown in FIG. Figure 1 Examples and Figure 5 The difference between the embodiments is Figure 1 The switch SW1 is replaced by the bidirectional conversion circuit 240.

[0062] In one embodiment, to make Figure 5 The operation of the power conversion system 200 is easy to understand, please refer to Figure 6 . Figure 6 is the bus terminal voltage V of the power conversion system 200 according to some embodiments of the present invention. BUS(i.e., capacitance C BUS The voltage difference between the two ends) and the output voltage V O (i.e., capacitance C O See the diagram of the pressure difference between the two ends. Figure 5 and Figure 6 When the controller 230 detects that the DC power of the energy tank 220 is lower than the preset charge before the time point P1, the controller 230 is used to output a control signal and switch the level of the signal to switch the bidirectional conversion circuit 240 to the charging mode, so that the DC / DC conversion circuit 210 charges the energy tank 220 to the output voltage V O When the energy tank 220 is charged to the output voltage V O The controller 230 controls the level of the switching signal to switch the bidirectional conversion circuit 240 to the standby mode.

[0063] Next, when the controller 230 detects the bus terminal voltage V at time point P1 BUS When the voltage is lower than the default voltage V1 (i.e., the load R is too large causing a voltage drop), the controller 230 is used to control the level of the switching signal to switch the bidirectional conversion circuit 240 to the charging mode, so that the DC power stored in the energy slot 220 is provided to the output end of the DC / DC conversion circuit 210 to compensate for the DC power at the output end of the DC / DC conversion circuit 210.

[0064] Furthermore, please refer to Figure 7 , Figure 7 According to some embodiments of the present invention, Figure 6 Schematic diagram of a bidirectional conversion circuit 240 of a power conversion system 200. The bidirectional conversion circuit 240 includes transistors T1 to T4 and an inductor L. Please take the top and right of the components in the icon as the first end, and the inductor L includes a first end and a second end. Transistor T1 includes a first end, a second end and a control end. The first end of transistor T1 is coupled to the energy tank 220. The second end of transistor T1 is coupled to the second end of inductor L. The control end of transistor T1 is used to receive a control signal S1 from the controller 230 and is turned on in response to the control signal S1. The first end of transistor T2 is coupled to the second end of inductor L. The second end of transistor T2 is coupled to the energy tank 220. The control end of transistor T2 is used to receive a control signal S2 from the controller 230 and is turned on in response to the control signal S2. Transistor T1 and transistor T2 are not turned on at the same time.

[0065] The first end of transistor T3 is coupled to the live wire LW. The second end of transistor T3 is coupled to the first end of inductor L. The control end of transistor T3 is used to receive the control signal S3 from controller 230, and is turned on in response to the control signal S3. The first end of transistor T4 is coupled to the first end of inductor L. The second end of transistor T4 is coupled to ground wire EW and the second end of transistor T2. The control end of transistor T4 is used to receive the control signal S4 from controller 230, and is turned on in response to the control signal S4. Transistor T3 and transistor T4 are not turned on at the same time.

[0066] It is further explained that Figure 7 The circuit architecture of the bidirectional conversion circuit 240 is merely an example, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and applications may be made without departing from the essential features of the aspects. For example, the components described in detail in the above aspects may be modified. In addition, differences associated with these modifications and applications should be interpreted as being included within the scope of the present invention as defined by the following claims.

[0067] The following will be based on Figure 7 The bidirectional conversion circuit 240 is shown in FIG. 1 and an example is provided to explain different operation modes of the bidirectional conversion circuit 240. For example, assuming that the output voltage Vo (i.e., the capacitor C O The voltage difference between the two ends of the energy tank 220 is 48V (volts). The voltage range that the energy tank 220 can provide is between 24V and 64V. When the power conversion system 200 just starts to operate, the energy tank 220 does not store DC power. When the controller 230 detects that the DC power of the energy tank 220 is lower than the preset charge amount, the controller 230 generates control signals S1~S4 respectively to switch the bidirectional conversion circuit 240 to the charging mode, so that the transistor T1 in the bidirectional conversion circuit 240 remains turned on, the transistor T2 is turned off, and the transistor T3 and the transistor T4 are turned on in turn. At this time, the output end of the DC / DC conversion circuit 210 of the bidirectional conversion circuit 240 charges the energy tank 220 to 48V close to the output end of the DC / DC conversion circuit 210.

[0068] When the energy tank 220 is charged close to 48V or a default voltage value of the output terminal of the DC / DC conversion circuit 210 , the controller 230 changes the voltage levels of the control signals S1 - S4 to switch the bidirectional conversion circuit 240 to the standby mode.

[0069] In one embodiment, when the voltage of the energy tank 220 is charged to a voltage close to the output voltage 48V, after the transistor T3 of the bidirectional conversion circuit 240 reaches the maximum conduction time, the bidirectional conversion circuit 240 switches the transistors T1 to T4 at a high frequency as a boost converter so that the voltage of the energy tank 220 can be smoothly charged from 48V to a voltage slightly higher than the output voltage of the DC / DC conversion circuit 210. At this time, the transistor T3 is constantly turned on and the transistor T4 is constantly turned off. The transistor T1 and the transistor T2 are switched at a high frequency, and the bidirectional conversion circuit 240 acts as a boost converter to charge the voltage of the energy tank 220 to the target voltage of 64V.

[0070] Next, see Figure 6 and Figure 7 , when the controller 230 detects the bus terminal voltage V at time point P1 BUS When the voltage is lower than the default voltage V1 (i.e., the load R is too large to cause a voltage drop), the controller 230 generates control signals S1-S4 respectively to switch the bidirectional conversion circuit 240 to the discharge mode, so that the transistor T3 in the bidirectional conversion circuit 240 remains turned on, the transistor T4 is turned off, and the transistors T1 and T2 are turned on in turn, so that the DC power stored in the energy tank 220 compensates the output end of the DC / DC conversion circuit 210, thereby making the output voltage V O Maintain stability.

[0071] See also Figure 2 and Figure 6 At time point P1, compared with the compensation method of the controller 130 of the power conversion system 100, the controller 230 of the power conversion system 200 detects the DC power at the output end of the DC / DC conversion circuit 210 in real time to generate control signals S1-S4 respectively to make the output voltage V O Maintain stability in real time.

[0072] In one embodiment, see Figure 5 and Figure 6 The controller 230 may be configured to detect the DC power (ie, the output voltage V O If the output voltage V O When the voltage V2 is lower than the default voltage V2, the controller 230 will perform the above operation to compensate the DC power at the output end of the DC / DC conversion circuit 210. The detailed operation is similar to the above description paragraph and will not be repeated here.

[0073] Figure 81 is a circuit diagram of a power conversion system 200A according to some embodiments of the present invention. The power conversion system 100A includes a power device PU. The power device PU includes a DC / DC conversion circuit 210A, an energy tank 220A, a controller 230A, a bidirectional conversion circuit 240A, and a power factor correction circuit PFC. The connection methods and operations of the DC / DC conversion circuit 210A, the energy tank 220A, the controller 230A, the bidirectional conversion circuit 240A, and the power factor correction circuit PFC are similar to Figure 5 The connection method and operation of the corresponding components in the power device PU of the power conversion system 200 are described below for the sake of simplicity, only the differences are described below.

[0074] Compared to Figure 5 In the embodiment, the controller 230A is used to detect the bus terminal (ie, the capacitor C BUS The voltage difference between the two ends of the bus is controlled in real time by the bidirectional conversion circuit 240A to discharge the energy tank 220A to the input end of the DC / DC conversion circuit 210A, thereby stabilizing the bus terminal voltage V BUS .

[0075] In one embodiment, see Figure 8 The controller 230A may be configured to detect the DC power (i.e., the output voltage V O If the output voltage V O When the voltage V2 is lower than the default voltage V2, the controller 230A will perform the above operation to compensate the DC power at the input end of the DC / DC conversion circuit 210A. The detailed operation is similar to the above description paragraph and will not be repeated here.

[0076] Fig. 9 FIG. 3 is a circuit diagram of a power conversion system 300 according to some embodiments of the present invention. The power conversion system 300 includes a power device PU and a compensation device CU. Figure 1 In the power conversion system 100, the power device PU and the compensation device CU of the power conversion system 300 are not formed in one piece. That is, the power device PU and the compensation device CU can be corresponding combination devices. The power device PU includes a DC / DC conversion circuit 310 and a power factor correction circuit PFC. The compensation device CU includes an energy tank 320, a controller 330 and a switch SW1. In some embodiments, the controller 330 is connected to the power device PU in communication to obtain the bus terminal voltage V BUS .

[0077] Fig.10 FIG. 4 is a circuit diagram of a power conversion system 400 according to some embodiments of the present invention. The power conversion system 400 includes a power device PU and a compensation device CU. Figure 3 In the power conversion system 100A, the power device PU and the compensation device CU of the power conversion system 400 are not formed in one piece. That is, the power device PU and the compensation device CU can be corresponding combination devices. The power device PU includes a DC / DC conversion circuit 410 and a power factor correction circuit PFC. The compensation device CU includes an energy tank 420, a controller 430 and a switch SW1. In some embodiments, the controller 430 is connected to the power device PU in communication to obtain the bus terminal voltage V BUS .

[0078] Fig.11 FIG. 5 is a circuit diagram of a power conversion system 500 according to some embodiments of the present invention. The power conversion system 500 includes a power device PU and a compensation device CU. Figure 5 In the power conversion system 200, the power device PU and the compensation device CU of the power conversion system 500 are not formed in one piece. That is, the power device PU and the compensation device CU can be corresponding combined devices. The power device PU includes a DC / DC conversion circuit 510 and a power factor correction circuit PFC. The compensation device CU includes an energy tank 520, a controller 530 and a bidirectional conversion circuit 540. In some embodiments, the controller 530 is connected to the power device PU in communication to obtain the bus terminal voltage V BUS .

[0079] Fig.12 FIG. 6 is a circuit diagram of a power conversion system 600 according to some embodiments of the present invention. The power conversion system 600 includes a power device PU and a compensation device CU. Figure 8 In the power conversion system 200A, the power device PU and the compensation device CU of the power conversion system 600 are not formed in one piece. That is, the power device PU and the compensation device CU can be corresponding combination devices. The power device PU includes a DC / DC conversion circuit 610 and a power factor correction circuit PFC. The compensation device CU includes an energy tank 620, a controller 630 and a bidirectional conversion circuit 640. In some embodiments, the controller 630 is connected to the power device PU in communication to obtain the bus terminal voltage V BUS .

[0080] Fig.13 Schematic diagram of a power conversion system 700 according to some embodiments of the present invention. The power conversion system 700 includes a power device PU. The power device PU includes a DC / DC conversion circuit 710, an energy tank 720, a controller 730, a switch SW1, a bidirectional conversion circuit 740, an energy storage circuit 750, and a power factor correction circuit PFC. Figure 1In the power conversion system 100, the power device PU additionally includes a bidirectional conversion circuit 740 and an energy storage circuit 750. The energy storage circuit 750 is coupled to the DC / DC conversion circuit 710 and is used to store DC power. The bidirectional conversion circuit 740 is coupled between the energy storage circuit 750 and the DC / DC conversion circuit 710.

[0081] In one embodiment, when the controller 730 detects that the AC power of the power conversion system 700 is abnormal (for example, the AC power is zero and the oscillation voltage of the AC power is less than the default oscillation voltage), the controller 730 is used to turn off the switch SW1 and switch the bidirectional conversion circuit 740 to the discharge mode, so that the energy storage circuit 750 provides DC power to the DC / DC conversion circuit 710.

[0082] In one embodiment, the power conversion system 700 may also be implemented as follows: Fig.10 In one embodiment, the bidirectional conversion circuit 740 and the energy storage circuit 750 may be arranged in a manner such as Fig.10 In the compensation device CU of the power conversion system 700.

[0083] Fig.13 The power conversion system 700 provides DC power to the load R when the AC power fails, so as to realize the uninterrupted power function of the power conversion system 700. In addition, the design of the energy tank 720 and the energy storage circuit 750 of the present case further prolongs the service life of the internal battery (not shown) of the power device PU.

[0084] Fig.14 Schematic diagram of a power conversion system 800 according to some embodiments of the present invention. The power conversion system 800 includes a power device PU. The power device PU includes a DC / DC conversion circuit 810, an energy tank 820, a controller 830, a bidirectional conversion circuit 840, a bidirectional conversion circuit 850, an energy storage circuit 860, and a power factor correction circuit PFC. Figure 5 In the power conversion system 200, the power device PU additionally adds a bidirectional conversion circuit 840 and a bidirectional conversion circuit 850. The energy storage circuit 860 is coupled to the DC / DC conversion circuit 810 and is used to store DC power. The bidirectional conversion circuit 850 is coupled between the energy storage circuit 860 and the DC / DC conversion circuit 810.

[0085] In one embodiment, when the controller 830 detects that the AC power of the power conversion system 800 is abnormal (for example, the AC power is zero and the oscillation voltage of the AC power is less than the default oscillation voltage), the controller 830 is used to switch the bidirectional conversion circuit 840 to the standby mode and switch the bidirectional conversion circuit 850 to the discharge mode, so that the energy storage circuit 860 provides DC power to the DC / DC conversion circuit 810.

[0086] Fig.14 The power conversion system 800 provides DC power to the load R when the AC power fails, so as to realize the uninterrupted power function of the power conversion system 800. In addition, the design of the energy tank 820 and the energy storage circuit 860 of the present case further prolongs the service life of the internal battery (not shown) of the power device PU.

[0087] In one embodiment, the power conversion system 800 can also be implemented as follows Fig.11 In one embodiment, the bidirectional conversion circuit 850 and the energy storage circuit 860 may be arranged in a Fig.11 In the compensation device CU of the power conversion system 500.

[0088] According to the above embodiments, the present invention provides a power conversion system. The power conversion system of the present invention is designed to respond to the dynamic changes of the load in real time, so as to control the energy slot to compensate for the voltage drop at the DC bus terminal and the DC output terminal, so that the voltage drop is maintained at the standard voltage, and does not cause current distortion on the AC side, thereby affecting the harmonic components of the power grid.

[0089] For those skilled in the art, various changes and modifications can be made to the present invention without departing from the spirit and scope of the present invention. Based on the above embodiments, all changes and modifications made to the present invention are also included in the protection scope of the present invention.

Claims

1. A power conversion system, comprising: a DC / DC conversion circuit, configured to convert the first DC power into a second DC power, and provide the second DC power to a dynamic load; an energy tank, coupled to the DC / DC conversion circuit; a switch, coupled between the energy tank and the DC / DC conversion circuit; as well as A controller is coupled to the energy slot and the switch, and is used to respectively detect a first voltage of the first DC power and a second voltage of the second DC power to determine changes in the dynamic load, wherein when the controller detects that the first voltage is lower than a first default voltage or detects that the second voltage is lower than a second default voltage, the controller is used to turn on the switch so that a third DC power stored in the energy slot is provided to the DC / DC conversion circuit to compensate for one of the first DC power and the second DC power.

2. The power conversion system according to claim 1, wherein the switch is coupled to the output end of the DC / DC conversion circuit, and when the controller detects that the first voltage is lower than the first default voltage, the controller is used to turn on the switch so that the third DC power is provided to the output end to compensate for the second DC power.

3. The power conversion system according to claim 1, wherein the switch is coupled to an input end of the DC / DC conversion circuit, and when the controller detects that the first voltage is lower than the first default voltage, the controller is used to turn on the switch so that the third DC power is provided to the input end to compensate for the first DC power.

4. The power conversion system according to claim 1, wherein the switch is coupled to the output end of the DC / DC conversion circuit, and when the controller detects that the second voltage is lower than the second default voltage, the controller is used to turn on the switch so that the third DC power is provided to the output end to compensate for the second DC power.

5. The power conversion system according to claim 1, wherein the switch is coupled to an input end of the DC / DC conversion circuit, and when the controller detects that the second voltage is lower than the second default voltage, the controller is configured to turn on the switch so that the third DC power is provided to the input end to compensate for the first DC power.

6. The power conversion system according to claim 1, wherein the controller is further used to detect whether the third DC power of the energy slot is lower than a preset charge amount, wherein if the third DC power of the energy slot is lower than the preset charge amount, the controller is further used to turn on the switch so that one of the first DC power and the second DC power charges the energy slot.

7. The power conversion system according to claim 1, further comprising: an energy storage circuit, coupled to the DC / DC conversion circuit, and used to store fourth DC power; and The bidirectional conversion circuit is coupled between the energy storage circuit and the DC / DC conversion circuit, wherein when the controller detects that the AC power of the power conversion system is abnormal, the controller is used to turn off the switch and switch the bidirectional conversion circuit to a discharge mode, so that the energy storage circuit provides the fourth DC power to the DC / DC conversion circuit.

8. The power conversion system according to claim 7, wherein the controller is further used to detect whether the fourth DC power of the energy storage circuit is lower than a preset charge amount, wherein if the fourth DC power of the energy storage circuit is lower than the preset charge amount, the controller is further used to turn off the switch and switch the bidirectional conversion circuit to a charging mode to charge the energy storage circuit, wherein if the fourth DC power of the energy storage circuit is not lower than the preset charge amount, the bidirectional conversion circuit is switched to a standby mode.

9. The power conversion system according to claim 1, further comprising: A power device, comprising the DC / DC conversion circuit; and The compensation device is coupled to the power device, wherein the compensation device comprises the energy tank, the switch and the controller, and wherein the power device and the compensation device are not formed in one piece.

10. The power conversion system according to claim 9, wherein the compensation device further comprises: an energy storage circuit, coupled to the DC / DC conversion circuit, and used to store fourth DC power; and The bidirectional conversion circuit is coupled between the energy storage circuit and the DC / DC conversion circuit, wherein when the controller detects that the AC power of the power conversion system is abnormal, the controller is used to turn off the switch and switch the bidirectional conversion circuit to a discharge mode, so that the energy storage circuit provides the fourth DC power to the DC / DC conversion circuit.

11. A power conversion system comprising: a DC / DC conversion circuit, configured to convert the first DC power into a second DC power, and provide the second DC power to a dynamic load; an energy tank, coupled to the DC / DC conversion circuit; A first bidirectional conversion circuit, coupled between the energy tank and the DC / DC conversion circuit; as well as A controller is coupled to the energy slot and the first bidirectional conversion circuit, and is used to respectively detect a first voltage of the first DC power and a second voltage of the second DC power to determine changes in the dynamic load, wherein when the controller detects that the first voltage is lower than a first default voltage or detects that the second voltage is lower than a second default voltage, the controller is used to turn on the first bidirectional conversion circuit so that the third DC power stored in the energy slot is provided to the DC / DC conversion circuit to compensate for one of the first DC power and the second DC power.

12. The power conversion system according to claim 11, wherein the first bidirectional conversion circuit is coupled to an output end of the DC / DC conversion circuit, wherein when the controller detects that the first voltage is lower than the first default voltage, the controller is used to turn on the first bidirectional conversion circuit so that the third DC power is provided to the output end to compensate for the second DC power.

13. The power conversion system according to claim 11, wherein the first bidirectional conversion circuit is coupled to an input end of the DC / DC conversion circuit, wherein when the controller detects that the first voltage is lower than the first default voltage, the controller is used to turn on the first bidirectional conversion circuit so that the third DC power is provided to the input end to compensate for the first DC power.

14. The power conversion system according to claim 11, wherein the first bidirectional conversion circuit is coupled to an output end of the DC / DC conversion circuit, wherein when the controller detects that the second voltage is lower than the second default voltage, the controller is used to turn on the first bidirectional conversion circuit so that the third DC power is provided to the output end to compensate for the second DC power.

15. The power conversion system according to claim 11, wherein the first bidirectional conversion circuit is coupled to the input end of the DC / DC conversion circuit, wherein when the controller detects that the second voltage is lower than the second default voltage, the controller is used to turn on the first bidirectional conversion circuit so that the third DC power is provided to the input end to compensate for the first DC power.

16. The power conversion system according to claim 11, wherein the controller is further used to detect whether the third DC power of the energy slot is lower than a preset charge amount, wherein if the third DC power is lower than the preset charge amount, the controller is further used to switch the first bidirectional conversion circuit to a charging mode to charge the energy slot, wherein if the third DC power is not lower than the preset charge amount, the controller is further used to switch the first bidirectional conversion circuit to a standby mode.

17. The power conversion system according to claim 11, further comprising: an energy storage circuit, coupled to the DC / DC conversion circuit, and used to store fourth DC power; and The second bidirectional conversion circuit is coupled between the energy storage circuit and the DC / DC conversion circuit, wherein when the controller detects that the AC power of the power conversion system is abnormal, the controller is used to switch the first bidirectional conversion circuit to a standby mode and switch the bidirectional conversion circuit to a discharge mode, so that the energy storage circuit provides the fourth DC power to the DC / DC conversion circuit.

18. The power conversion system according to claim 17, wherein the controller is further used to detect whether the fourth DC power of the energy storage circuit is lower than a preset charge amount, wherein if the fourth DC power is lower than the preset charge amount, the controller is further used to switch the second bidirectional conversion circuit to a charging mode to charge the energy storage circuit, wherein if the fourth DC power is not lower than the preset charge amount, the second bidirectional conversion circuit is switched to the standby mode.

19. The power conversion system according to claim 11, further comprising: A power device, comprising the DC / DC conversion circuit; and A compensation device is coupled to the power device, wherein the compensation device includes the energy slot, the first bidirectional conversion circuit and the controller, wherein the power device and the compensation device are not formed in one piece.

20. The power conversion system of claim 19, wherein the compensation device comprises: an energy storage circuit, coupled to the DC / DC conversion circuit, and used to store fourth DC power; and The second bidirectional conversion circuit is coupled between the energy storage circuit and the DC / DC conversion circuit, wherein when the controller detects that the AC power of the power conversion system is abnormal, the controller is used to switch the first bidirectional conversion circuit to a standby mode and switch the bidirectional conversion circuit to a discharge mode, so that the energy storage circuit provides the fourth DC power to the DC / DC conversion circuit.

Images