Driving power supply circuit and power supply equipment of three-phase bidirectional LLC isolation topology

Abstract

The utility model provides a driving power supply circuit and power supply equipment of a three-phase bidirectional LLC isolation topology. The driving power supply circuit comprises a first power supply pin, wherein the negative electrode of a first power supply is used for being connected with the high-voltage side of the three-phase bidirectional LLC isolation topology; the first end of the first bootstrap power supply circuit, the first end of the second bootstrap power supply circuit and the first end of the third bootstrap power supply circuit are all connected with the positive electrode of a first power supply, and the second end of the first bootstrap power supply circuit is connected with the source electrode of a first controllable switch tube and the drain electrode of a second controllable switch tube of the high-voltage side conversion circuit. And the second end of the second bootstrap power supply circuit is connected with the source electrode of a third controllable switch tube and the drain electrode of a fourth controllable switch tube of the high-voltage side conversion circuit. The second end of the third bootstrap power supply circuit is connected with the source electrode of a fifth controllable switch tube and the drain electrode of a sixth controllable switch tube of the high-voltage side conversion circuit; and the source electrode of the second controllable switch tube, the source electrode of the fourth controllable switch tube and the source electrode of the sixth controllable switch tube are connected with the positive electrode of the first power supply.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, in particular to a driving power supply circuit of a three-phase bidirectional LLC isolation topology and a power supply device. BACKGROUND

[0002] An isolation transformer is used in a power converter to supply power to a driving circuit, ensuring electrical isolation between high and low voltage sides. The transformer is designed to have multiple outputs to supply driving circuits for high-side and low-side switching tubes respectively.

[0003] The three-phase bidirectional LLC isolation topology requires 8-way isolated driving power supply. The input high-voltage side MOS1, MOS3, MOS5, MOS2, MOS4 and MOS6 require 4-way power supply, and the output low-voltage side MOS7, MOS9, MOS11, MOS8, MOS10 and MOS12 require 4-way power supply. This structure makes the topology structure complex, the power supply design difficult, the PCB circuit board design difficult, and the cost high and the volume large. CONTENT OF THE INVENTION

[0004] Therefore, it is necessary to provide a driving power supply circuit of a three-phase bidirectional LLC isolation topology and a power supply device in view of the above technical problems.

[0005] A driving power supply circuit of a three-phase bidirectional LLC isolation topology, the three-phase bidirectional LLC isolation topology comprising a high-voltage side conversion circuit and a low-voltage side conversion circuit, the driving power supply circuit comprising:

[0006] a first power supply, a negative electrode of the first power supply being used to connect a first power supply pin of the high-voltage side of the three-phase bidirectional LLC isolation topology;

[0007] a first bootstrap power supply circuit, a first end of the first bootstrap power supply circuit being connected to a positive electrode of the first power supply, and a second end of the first bootstrap power supply circuit being connected to a source terminal of a first controllable switching tube and a drain terminal of a second controllable switching tube of the high-voltage side conversion circuit;

[0008] a second bootstrap power supply circuit, a first end of the second bootstrap power supply circuit being connected to the positive electrode of the first power supply, and a second end of the second bootstrap power supply circuit being connected to a source terminal of a third controllable switching tube and a drain terminal of a fourth controllable switching tube of the high-voltage side conversion circuit;

[0009] a third bootstrap power supply circuit, a first end of the third bootstrap power supply circuit being connected to the positive electrode of the first power supply, and a second end of the third bootstrap power supply circuit being connected to a source terminal of a fifth controllable switching tube and a drain terminal of a sixth controllable switching tube of the high-voltage side conversion circuit;

[0010] The source of the second controllable switch tube, the source of the fourth controllable switch tube, and the source of the sixth controllable switch tube are connected with the positive pole of the first power supply.

[0011] In one of the embodiments, the driving power supply circuit further comprises:

[0012] A second power supply, which is obtained by electrically isolating the first power supply, and the negative pole of the second power supply is used to connect the first power supply pin of the low-voltage side of the three-phase bidirectional LLC isolation topology;

[0013] A fourth bootstrap power supply circuit, the first end of the fourth bootstrap power supply circuit is connected with the positive pole of the second power supply, and the second end of the fourth bootstrap power supply circuit is connected with the source level of the seventh controllable switch tube and the drain of the eighth controllable switch tube of the low-voltage side conversion circuit;

[0014] A fifth bootstrap power supply circuit, the first end of the fifth bootstrap power supply circuit is connected with the positive pole of the second power supply, and the second end of the fifth bootstrap power supply circuit is connected with the source level of the ninth controllable switch tube and the drain of the tenth controllable switch tube of the low-voltage side conversion circuit;

[0015] A sixth bootstrap power supply circuit, the first end of the sixth bootstrap power supply circuit is connected with the positive pole of the second power supply, and the second end of the sixth bootstrap power supply circuit is connected with the source level of the eleventh controllable switch tube and the drain of the twelfth controllable switch tube of the low-voltage side conversion circuit;

[0016] The source of the eighth controllable switch tube, the source of the tenth controllable switch tube, and the source of the twelfth controllable switch tube are connected with the positive pole of the second power supply.

[0017] In one of the embodiments, the fourth bootstrap power supply circuit comprises:

[0018] A first diode, the anode of the first diode is connected with the positive pole of the second power supply;

[0019] A first capacitor, the first end of the first capacitor is connected with the cathode of the first diode, and the second end of the first capacitor is connected with the source level of the seventh controllable switch tube and the drain of the eighth controllable switch tube of the low-voltage side conversion circuit.

[0020] In one of the embodiments, the fifth bootstrap power supply circuit and the sixth bootstrap power supply circuit have the same circuit topology as the fourth bootstrap power supply circuit.

[0021] In one of the embodiments, the capacity of the first capacitor is between 1uF and 100uF.

[0022] In one of the embodiments, the first bootstrap power supply circuit comprises:

[0023] a second diode, an anode of the second diode being connected with a positive pole of the first power supply;

[0024] a second capacitor, a first end of the second capacitor being connected with a cathode of the second diode, and a second end of the second capacitor being connected with a source of the first controllable switch and a drain of the second controllable switch of the high-voltage side conversion circuit.

[0025] In one of the embodiments, the second bootstrap supply circuit and the third bootstrap supply circuit have the same circuit topology as the first bootstrap supply circuit.

[0026] In one of the embodiments, the capacity of the second capacitor is between 1uF and 100uF.

[0027] In one of the embodiments, during the charging process, the first bootstrap supply circuit, the second bootstrap supply circuit, the third bootstrap supply circuit, the fourth bootstrap supply circuit, the fifth bootstrap supply circuit and the sixth bootstrap supply circuit are sequentially charged in order.

[0028] A power supply device comprising the driving power supply circuit of the three-phase bidirectional LLC isolation topology according to any one of the above embodiments.

[0029] Compared with the prior art, the driving power supply circuit and the power supply device of the three-phase bidirectional LLC isolation topology, the driving power supply circuit comprises a first power supply, a first bootstrap supply circuit, a second bootstrap supply circuit and a third bootstrap supply circuit. The negative pole of the first power supply is used to connect the first power supply pin of the high-voltage side of the three-phase bidirectional LLC isolation topology. The first end of the first bootstrap supply circuit is connected with the positive pole of the first power supply, and the second end of the first bootstrap supply circuit is connected with the source of the first controllable switch and the drain of the second controllable switch of the high-voltage side conversion circuit. The first end of the second bootstrap supply circuit is connected with the positive pole of the first power supply, and the second end of the second bootstrap supply circuit is connected with the source of the third controllable switch and the drain of the fourth controllable switch of the high-voltage side conversion circuit. The first end of the third bootstrap supply circuit is connected with the positive pole of the first power supply, and the second end of the third bootstrap supply circuit is connected with the source of the fifth controllable switch and the drain of the sixth controllable switch of the high-voltage side conversion circuit. The source of the second controllable switch, the source of the fourth controllable switch and the source of the sixth controllable switch are all connected with the positive pole of the first power supply. The first power supply cooperates with the first bootstrap supply circuit, the second bootstrap supply circuit and the third bootstrap supply circuit to realize the power supply of the high-voltage side of the three-phase bidirectional LLC isolation topology. The circuit design is simple, the PCB layout is reasonable, and the cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0031] Figure 1 A circuit schematic diagram of a driving power supply circuit of a three-phase bidirectional LLC isolation topology provided by an embodiment of the present application;

[0032] Figure 2 A circuit diagram of a three-phase bidirectional LLC isolation topology provided by an embodiment of the present application;

[0033] Figure 3 A partial circuit schematic diagram of a driving power supply circuit of a three-phase bidirectional LLC isolation topology provided by an embodiment of the present application;

[0034] Figure 4 A schematic diagram of power conversion provided by an embodiment of the present application;

[0035] Figure 5 A simulation schematic diagram of a switching frequency of 10Hz provided by an embodiment of the present application;

[0036] Figure 6 A simulation schematic diagram of a switching frequency of 1000Hz provided by an embodiment of the present application;

[0037] Figure 7 A partial circuit schematic diagram of a power supply device provided by another embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to make the above purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific implementation disclosed below.

[0039] The serial numbers of components used herein, such as "first", "second", etc., are only used for distinguishing between objects described, and do not have any sequential or chronological implications unless otherwise specified. In this application, "connected", "coupled" or "linked" are used broadly and encompass both direct and indirect coupling, linking, or pneumatic connection through an intermediate medium unless otherwise specifically noted. In the description of the application, it should be understood that the terms "on", "under", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate the orientation or positional relationship based on the positions shown in the drawings, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0040] In this application, unless otherwise clearly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0041] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intermediate element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intermediate element.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0043] See Figure 1 and Figure 2In an embodiment of the present application, a driving power supply circuit 10 of a three-phase bidirectional LLC isolation topology is provided. The three-phase bidirectional LLC isolation topology includes a high-voltage side conversion circuit and a low-voltage side conversion circuit. In some embodiments, the specific circuit topology of the high-voltage side conversion circuit is not limited, for example, the high-voltage side conversion circuit can adopt a single full-bridge topology, or a plurality of full-bridge topologies connected in series. In some embodiments, the specific circuit topology of the low-voltage side conversion circuit is not limited, for example, the low-voltage side conversion circuit can adopt a single full-bridge topology, or a plurality of full-bridge topologies connected in parallel.

[0044] The driving power supply circuit includes a first power supply VCC, a first bootstrap power supply circuit 110, a second bootstrap power supply circuit 120, and a third bootstrap power supply circuit 130. The negative electrode of the first power supply VCC is used to connect the first power supply pin Vin- of the high-voltage side of the three-phase bidirectional LLC isolation topology. The first end of the first bootstrap power supply circuit 110 is connected to the positive electrode of the first power supply VCC. The second end of the first bootstrap power supply circuit 110 is connected to the source terminal of the first controllable switch tube and the drain terminal of the second controllable switch tube of the high-voltage side conversion circuit. The first end of the second bootstrap power supply circuit 120 is connected to the positive electrode of the first power supply VCC. The second end of the second bootstrap power supply circuit 120 is connected to the source terminal of the third controllable switch tube and the drain terminal of the fourth controllable switch tube of the high-voltage side conversion circuit. The first end of the third bootstrap power supply circuit 130 is connected to the positive electrode of the first power supply VCC. The second end of the third bootstrap power supply circuit 130 is connected to the source terminal of the fifth controllable switch tube and the drain terminal of the sixth controllable switch tube of the high-voltage side conversion circuit. The source terminal of the second controllable switch tube, the source terminal of the fourth controllable switch tube, and the source terminal of the sixth controllable switch tube are all connected to the positive electrode of the first power supply VCC.

[0045] In some embodiments, the specific circuit topology of the first bootstrap power supply circuit 110 is not limited, as long as it has the function of supplying power to the first controllable switch tube. In some embodiments, the first bootstrap power supply circuit 110 can be an energy storage capacitor. The number of energy storage capacitors is not limited, and a plurality of capacitors can be connected in series and / or parallel. In some embodiments, the first controllable switch tube can be a MOS tube, an IGBT tube, or a triode. In this embodiment, a MOS tube is taken as an example. As shown in the figure, the first controllable switch tube is MOS1. Figure 2

[0046] ​Similarly, the specific circuit topology of the second bootstrap supply circuit 120 is not limited, as long as it has the function of supplying power to the third controllable switch tube. In some embodiments, the second bootstrap supply circuit 120 can be an energy storage capacitor. Among them, the number of energy storage capacitors is not limited, and a plurality of capacitors can be connected in series and / or parallel. In some embodiments, the fifth controllable switch tube can be a MOS tube, or an IGBT tube or a triode, and the present embodiment takes a MOS tube as an example. As shown in Figure 2 , the fifth controllable switch tube is MOS5.

[0047] Similarly, the specific circuit topology of the third bootstrap supply circuit 130 is not limited, as long as it has the function of supplying power to the fifth controllable switch tube. In some embodiments, the third bootstrap supply circuit 130 can be an energy storage capacitor. Among them, the number of energy storage capacitors is not limited, and a plurality of capacitors can be connected in series and / or parallel. In some embodiments, the fifth controllable switch tube can be a MOS tube, or an IGBT tube or a triode, and the present embodiment takes a MOS tube as an example. As shown in Figure 2 , the fifth controllable switch tube is MOS5.

[0048] In some embodiments, the second controllable switch tube, the fourth controllable switch tube, and the sixth controllable switch tube can be a MOS tube, or an IGBT tube or a triode, and the present embodiment takes a MOS tube as an example. As shown in Figure 2 , the second controllable switch tube is MOS2, the fourth controllable switch tube is MOS4, and the sixth controllable switch tube is MOS6.

[0049] In some embodiments, the first power supply VCC supplies power to the MOS in the high-voltage side conversion circuit. Specifically, the negative level of the first power supply VCC is connected to the first supply pin Vin-, and then the first power supply VCC can directly supply power to MOS2, MOS4, and MOS6, which are Vdrv2, Vdrv4, and Vdrv6, respectively. MOS1, MOS3, and MOS5 are upper bridge arm switch tubes, and the source of the tube is connected to the midpoint of the bridge arm and the first power supply VCC, and they are not grounded. Their driving power is supplied through the corresponding bootstrap supply circuit. That is, it is supplied by the energy storage capacitor in the bootstrap supply circuit.

[0050] The present embodiment can realize the power supply of the switch tube on the high-voltage side of the three-phase bidirectional LLC isolation topology through the first power supply VCC cooperating with the first bootstrap supply circuit 110, the second bootstrap supply circuit 120, and the third bootstrap supply circuit 130. Compared with the traditional circuit topology, the circuit design of the present embodiment is simple, the PCB layout is reasonable, and the cost is low, which meets the current market demand.

[0051] In some embodiments, as shown in Figure 3 andFigure 4 As shown, the driving power supply circuit further comprises a second power supply VCC1, a fourth bootstrap power supply circuit 140, a fifth bootstrap power supply circuit 150, and a sixth bootstrap power supply circuit 160. The second power supply VCC1 is obtained by electrically isolating the first power supply VCC. The negative electrode of the second power supply VCC1 is used to connect the first power supply pin VO- of the low-voltage side of the three-phase bidirectional LLC isolation topology. The first end of the fourth bootstrap power supply circuit 140 is connected to the positive electrode of the second power supply VCC1. The second end of the fourth bootstrap power supply circuit 140 is connected to the source of the seventh controllable switch tube and the drain of the eighth controllable switch tube of the low-voltage side conversion circuit. The first end of the fifth bootstrap power supply circuit 150 is connected to the positive electrode of the second power supply VCC1. The second end of the fifth bootstrap power supply circuit 150 is connected to the source of the ninth controllable switch tube and the drain of the tenth controllable switch tube of the low-voltage side conversion circuit. The first end of the sixth bootstrap power supply circuit 160 is connected to the positive electrode of the second power supply VCC1. The second end of the sixth bootstrap power supply circuit 160 is connected to the source of the eleventh controllable switch tube and the drain of the twelfth controllable switch tube of the low-voltage side conversion circuit. The source of the eighth controllable switch tube, the source of the tenth controllable switch tube, and the source of the twelfth controllable switch tube are all connected to the positive electrode of the second power supply VCC1.

[0052] In some embodiments, the second power supply VCC1 can be obtained by electrically isolating the first power supply VCC. In this way, the first power supply VCC can supply power to the MOS in the high-voltage side conversion circuit, and the second power supply VCC1 can supply power to the MOS in the low-voltage side conversion circuit.

[0053] In some embodiments, the specific circuit topology of the fourth bootstrap power supply circuit 140 is not limited as long as it has the function of supplying power to the seventh controllable switch tube. In some embodiments, the fourth bootstrap power supply circuit 140 can be an energy storage capacitor. The number of energy storage capacitors is not limited and can be a plurality of capacitors connected in series and / or parallel. In some embodiments, the seventh controllable switch tube can be a MOS tube, an IGBT tube, or a triode. In this embodiment, a MOS tube is taken as an example. As shown in Figure 2 The seventh controllable switch tube is a MOS7 tube.

[0054] Similarly, the specific circuit topology of the fifth bootstrap power supply circuit 150 is not limited as long as it has the function of supplying power to the ninth controllable switch tube. In some embodiments, the fifth bootstrap power supply circuit 150 can be an energy storage capacitor. The number of energy storage capacitors is not limited and can be a plurality of capacitors connected in series and / or parallel. In some embodiments, the ninth controllable switch tube can be a MOS tube, an IGBT tube, or a triode. In this embodiment, a MOS tube is taken as an example. As shown in Figure 2As shown, the ninth controllable switch tube is MOS9.

[0055] Similarly, the specific circuit topology of the sixth bootstrap supply circuit 160 is not limited, as long as it has the function of supplying power to the eleventh controllable switch tube. In some embodiments, the sixth bootstrap supply circuit 160 can be an energy storage capacitor. Among them, the number of energy storage capacitors is not limited, and they can be connected in series and / or parallel. In some embodiments, the eleventh controllable switch tube can be a MOS tube, or an IGBT tube or a triode, and the present embodiment takes a MOS tube as an example. As shown in the figure, Figure 2 As shown, the eleventh controllable switch tube is MOS11.

[0056] In some embodiments, the second controllable switch tube, the fourth controllable switch tube, and the sixth controllable switch tube can be MOS tubes, or IGBT tubes or triodes, and the present embodiment takes a MOS tube as an example. As shown in the figure, Figure 2 As shown, the second controllable switch tube is MOS2, the fourth controllable switch tube is MOS4, and the sixth controllable switch is MOS6.

[0057] In some embodiments, the negative level of the second power supply VCC1 is connected to the first supply pin VO- of the low-voltage side, and then the second power supply VCC1 can directly supply power to MOS8, MOS10, and MOS12, which are Vdrv8, Vdrv10, and Vdrv12, respectively. MOS7, MOS9, and MOS11 are upper bridge arm switch tubes, and the source of the tube is connected to the midpoint of the bridge arm and the second power supply VCC1, and their driving power is supplied through the corresponding bootstrap supply circuit. That is, it is supplied by the energy storage capacitor in the bootstrap supply circuit.

[0058] In the present embodiment, through the first power supply VCC cooperating with the first bootstrap supply circuit 110, the second bootstrap supply circuit 120, the third bootstrap supply circuit 130, the fourth bootstrap supply circuit 140, the fifth bootstrap supply circuit 150, and the sixth bootstrap supply circuit 160, all switch tubes of the three-phase bidirectional LLC isolation topology can be supplied with power. Compared with the traditional circuit topology, the circuit design of the present embodiment is simple, the PCB layout is reasonable, and the cost is low, which meets the current market demand.

[0059] In some embodiments, the fourth bootstrap power supply circuit 140 comprises a first diode 141 and a first capacitor 142. The anode of the first diode 141 is connected to the positive pole of the second power supply VCC1. The first end of the first capacitor 142 is connected to the cathode of the first diode 141. The second end of the first capacitor 142 is connected to the source of the seventh controllable switch tube and the drain of the eighth controllable switch tube of the low-voltage side conversion circuit. In some embodiments, the fifth bootstrap power supply circuit 150 and the sixth bootstrap power supply circuit 160 have the same circuit topology as the fourth bootstrap power supply circuit 140.

[0060] In some embodiments, the first bootstrap power supply circuit 110 comprises a second diode 111 and a second capacitor 112. The anode of the second diode 111 is connected to the positive pole of the first power supply VCC. The first end of the second capacitor 112 is connected to the cathode of the second diode 111. The second end of the second capacitor 112 is connected to the source of the first controllable switch tube and the drain of the second controllable switch tube of the high-voltage side conversion circuit. In some embodiments, the second bootstrap power supply circuit 120 and the third bootstrap power supply circuit 130 have the same circuit topology as the first bootstrap power supply circuit 110.

[0061] In some embodiments, during the charging process, the first bootstrap power supply circuit 110, the second bootstrap power supply circuit 120, the third bootstrap power supply circuit 130, the fourth bootstrap power supply circuit 140, the fifth bootstrap power supply circuit 150 and the sixth bootstrap power supply circuit 160 are sequentially charged in order.

[0062] Specifically, the three-phase bidirectional LLC isolation topology can work normally, the drive power supply of all MOS is normal, and the MOS can be reliably and stably turned on and turned off, so the bootstrap capacitor in the bootstrap power supply circuit needs to be fully charged before the topology works normally. According to the above principle, the charging circuit of the first bootstrap power supply circuit 110, VCC passes through the second diode 111 and the second capacitor 112, and MOS2 can fully charge the second capacitor 112. Therefore, MOS2 needs to be turned on by software command first, so as to charge the second capacitor 112. When the second capacitor 112 is fully charged, MOS2 needs to be turned off by software command, so as to achieve the initial balance state of the topology. Then, the bootstrap capacitor in the second bootstrap power supply circuit 120 is charged. VCC passes through the corresponding second diode 111 and the second capacitor 112, and MOS4 can fully charge the second capacitor 112. Therefore, MOS4 needs to be turned on by software command first, so as to charge the second capacitor 112. When the second capacitor 112 is fully charged, MOS4 needs to be turned off by software command, so as to achieve the initial balance state of the topology. Similarly, the bootstrap capacitors in other bootstrap power supply circuits need to be fully charged respectively.

[0063] In practical applications, the bootstrap capacitor supplies power to the driving chip, and the driving chip will have static loss. If the bootstrap capacitor is not charged in time, the electricity on the bootstrap capacitor will be discharged. In the three-phase bidirectional LLC isolation topology, there are six bootstrap capacitors. When the first bootstrap capacitor is fully charged, the electricity on the first bootstrap capacitor may be consumed by the driving chip before the sixth bootstrap capacitor is fully charged. Therefore, the bootstrap capacitor cannot be too small when selecting the bootstrap capacitor. When the bootstrap capacitor is large, the charging time of the bootstrap capacitor will be longer. When the first bootstrap capacitor is fully charged, the discharging time of the first bootstrap capacitor will also be longer when the sixth bootstrap capacitor is fully charged. Therefore, the capacitance of the bootstrap capacitor cannot be too large, which will increase the cost and volume. In some embodiments, the capacity of the first capacitor 142 can be selected to be between 1uF and 100uF. In some embodiments, the capacity of the second capacitor 112 can be selected to be between 1uF and 100uF.

[0064] In some embodiments, the bootstrap capacitor can maintain a stable driving voltage when the capacity of the bootstrap capacitor is small. As mentioned above, when charging the bootstrap capacitors in the three-phase bidirectional LLC isolation topology, the switching frequency can be increased, and the voltage on the bootstrap capacitor will be relatively stable. When the first bootstrap capacitor is fully charged, the voltage on the first bootstrap capacitor when the sixth bootstrap capacitor is fully charged is basically consistent with the maximum voltage. After a plurality of switching cycles at high frequency, the voltage on the six bootstrap capacitors remains stable.

[0065] As shown in Figure 5 and Figure 6 , only the switching frequency is changed, and other parameters remain unchanged. When the switching frequency is 10Hz, the voltage on the first bootstrap capacitor when the sixth bootstrap capacitor is fully charged is 6.34V. When the switching frequency is 1000Hz, the voltage on the first bootstrap capacitor when the sixth bootstrap capacitor is fully charged is 13.83V, and the maximum voltage on the bootstrap capacitor is 13.95V.

[0066] Please refer to Figure 7 , an embodiment of the present application provides a power supply device 20, which includes the driving power supply circuit 10 of the three-phase bidirectional LLC isolation topology in any of the above embodiments. The power supply device 20 in the embodiment can supply power to all the switching tubes of the three-phase bidirectional LLC isolation topology through the first power supply VCC cooperating with the first bootstrap power supply circuit 110, the second bootstrap power supply circuit 120, the third bootstrap power supply circuit 130, the fourth bootstrap power supply circuit 140, the fifth bootstrap power supply circuit 150, and the sixth bootstrap power supply circuit 160. Compared with the traditional circuit topology, the circuit design of the embodiment is simple, the PCB layout is reasonable, the cost is low, and the demand of the current market is met.

[0067] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as there is no conflict, any combination of the technical features should be considered within the scope of the present disclosure.

[0068] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, under the premise of not departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A drive power supply circuit with a three-phase bidirectional LLC isolated topology, characterized in that, The three-phase bidirectional LLC isolation topology includes a high-voltage side conversion circuit and a low-voltage side conversion circuit, and the drive power supply circuit includes: The first power supply, the negative terminal of which is used to connect to the first power supply pin on the high-voltage side of the three-phase bidirectional LLC isolation topology; The first bootstrap power supply circuit has a first terminal connected to the positive terminal of the first power supply, and a second terminal connected to the source of the first controllable switch and the drain of the second controllable switch in the high-voltage side conversion circuit. The second bootstrap power supply circuit has a first terminal connected to the positive terminal of the first power supply, and a second terminal connected to the source of the third controllable switch and the drain of the fourth controllable switch of the high-voltage side conversion circuit. The third bootstrap power supply circuit has its first terminal connected to the positive terminal of the first power supply, and its second terminal connected to the source of the fifth controllable switch and the drain of the sixth controllable switch in the high-voltage side conversion circuit. The source of the second controllable switch, the source of the fourth controllable switch, and the source of the sixth controllable switch are all connected to the positive terminal of the first power supply.

2. The drive power supply circuit of the three-phase bidirectional LLC isolated topology as described in claim 1, characterized in that, The drive power supply circuit also includes: The second power supply is obtained through electrical isolation from the first power supply, and the negative terminal of the second power supply is used to connect to the first power supply pin on the low-voltage side of the three-phase bidirectional LLC isolation topology. The fourth bootstrap power supply circuit has its first terminal connected to the positive terminal of the second power supply, and its second terminal connected to the source of the seventh controllable switch and the drain of the eighth controllable switch in the low-voltage side conversion circuit. The fifth bootstrap power supply circuit has its first terminal connected to the positive terminal of the second power supply, and its second terminal connected to the source of the ninth controllable switch and the drain of the tenth controllable switch of the low-voltage side conversion circuit. The sixth bootstrap power supply circuit has its first terminal connected to the positive terminal of the second power supply, and its second terminal connected to the source of the eleventh controllable switch and the drain of the twelfth controllable switch in the low-voltage side conversion circuit. The source of the eighth controllable switch, the source of the tenth controllable switch, and the source of the twelfth controllable switch are all connected to the positive terminal of the second power supply.

3. The drive power supply circuit of the three-phase bidirectional LLC isolated topology as described in claim 2, characterized in that, The fourth bootstrap power supply circuit includes: A first diode, the anode of which is connected to the positive terminal of the second power supply; The first capacitor has its first terminal connected to the cathode of the first diode, and its second terminal connected to the source of the seventh controllable switch and the drain of the eighth controllable switch in the low-voltage side conversion circuit.

4. The drive power supply circuit for the three-phase bidirectional LLC isolated topology as described in claim 3, characterized in that, The fifth bootstrap power supply circuit and the sixth bootstrap power supply circuit have the same circuit topology as the fourth bootstrap power supply circuit.

5. The drive power supply circuit for the three-phase bidirectional LLC isolated topology as described in claim 3, characterized in that, The capacitance of the first capacitor is between 1uF and 100uF.

6. The drive power supply circuit for the three-phase bidirectional LLC isolated topology as described in claim 2, characterized in that, The first bootstrap power supply circuit includes: The second diode has its anode connected to the positive terminal of the first power supply. The second capacitor has its first terminal connected to the cathode of the second diode, and its second terminal connected to the source of the first controllable switch and the drain of the second controllable switch in the high-voltage side conversion circuit.

7. The drive power supply circuit for the three-phase bidirectional LLC isolated topology as described in claim 6, characterized in that, The second bootstrap power supply circuit and the third bootstrap power supply circuit have the same circuit topology as the first bootstrap power supply circuit.

8. The drive power supply circuit for the three-phase bidirectional LLC isolated topology as described in claim 6, characterized in that, The capacitance of the second capacitor is between 1uF and 100uF.

9. The drive power supply circuit for the three-phase bidirectional LLC isolated topology as described in claim 2, characterized in that, During the charging process, the first bootstrap power supply circuit, the second bootstrap power supply circuit, the third bootstrap power supply circuit, the fourth bootstrap power supply circuit, the fifth bootstrap power supply circuit, and the sixth bootstrap power supply circuit are charged sequentially.

10. A power supply device, characterized in that, The drive power supply circuit includes the three-phase bidirectional LLC isolated topology as described in any one of claims 1-9.

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