Phase-shifted full-bridge bus bias voltage adjusting circuit and system based on magnetic coupling

Abstract

The utility model provides a phase-shifted full-bridge bus bias voltage adjusting circuit and system based on magnetic coupling. The circuit comprises a first bus, a second bus and an adjusting module. The first bus and the second bus are used for being connected with a phase-shifted full-bridge topological circuit; the adjusting module is connected to the first bus and the second bus, and the adjusting module is set to be capable of adjusting energy on the first bus and / or the second bus when the voltage at the two ends of the first bus is higher than the voltage at the two ends of the second bus. And the voltage at two ends of the first bus is equal to the voltage at two ends of the second bus. According to the utility model, the transformer magnetic coupling technology is utilized, the adjusting module is adopted to adjust the energy on the bus, and the problem of bus voltage sharing is solved.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to a phase-shifted full-bridge bus bias regulation circuit and system based on magnetic coupling. Background Art

[0002] In the two-way phase-shifted full-bridge topology of the positive and negative bus, due to the hardware differences in the drive circuit, the effective duty cycle of the two-way phase-shifted full-bridge cannot be exactly the same, resulting in different loads on the positive and negative bus, causing positive and negative bus bias. Especially when lightly loaded, the positive and negative bus bias is more obvious, seriously affecting the reliability of the product.

[0003] Therefore, it is crucial to solve the bus bias problem of the phase-shifted full-bridge and achieve bus voltage equalization. Utility Model Content

[0004] The present application provides a phase-shifted full-bridge bus bias regulation circuit and system based on magnetic coupling, which utilizes transformer magnetic coupling technology and adopts a regulation module to regulate the energy on the bus to solve the bus voltage equalization problem.

[0005] According to the first aspect of the present application, a phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling is provided, comprising: a first bus, a second bus and a regulation module; the first bus and the second bus are used to be connected to the phase-shifted full-bridge topology circuit; the regulation module is connected to the first bus and the second bus, and the regulation module is configured to be able to regulate the energy on the first bus and / or the second bus when the voltage across the first bus is higher than the voltage across the second bus, so that the voltage across the first bus is equal to the voltage across the second bus.

[0006] In some embodiments, the regulation module includes a coupling transformer and a control unit: the coupling transformer includes a core and a first primary coil and a second primary coil arranged on the core, and the first primary coil and the second primary coil have the same number of turns; the coupling transformer is configured to enable the first primary coil to be controlled to be connected in parallel with the first bus and the second primary coil to be controlled to be connected in parallel with the second bus under the action of the control unit, so as to regulate the energy on the first bus and / or the second bus when the voltage across the first bus is higher than the voltage across the second bus.

[0007] In some embodiments, the first primary coil and the second primary coil are wound around the core in a bifilar manner; and the core is an iron core or a magnetic core.

[0008] In some embodiments, the coupling transformer is configured to transfer energy on the first bus to the second bus when the voltage across the first bus is higher than the voltage across the second bus, so that the voltage across the first bus is equal to the voltage across the second bus.

[0009] In some embodiments, the coupling transformer further includes a secondary coil and a load unit: the secondary coil is connected to the load unit; the coupling transformer is configured to transfer energy on the first bus to the load unit through the secondary coil when the voltage across the first bus is higher than the voltage across the second bus, so that the voltage across the first bus is equal to the voltage across the second bus; or the coupling transformer is configured to transfer energy on the first bus and energy on the second bus to the load unit through the secondary coil when the voltage across the first bus is higher than the voltage across the second bus, and the energy transferred from the first bus to the load unit is greater than the energy transferred from the second bus to the load unit, so that the voltage across the first bus is equal to the voltage across the second bus.

[0010] In some embodiments, the regulating module further includes a first protection element and a second protection element, and the load unit includes a third protection element: the first protection element is connected in series with the first primary coil, and the second protection element is connected in series with the second primary coil.

[0011] In some embodiments, the first protection element, the second protection element, and the third protection element are all diodes.

[0012] In some embodiments, the control unit includes a first switch tube and a second switch tube, the first switch tube is connected in series with the first primary coil, and the second switch tube is connected in series with the second primary coil; the first switch tube and the second switch tube are configured to simultaneously receive drive signals with the same duty cycle so as to be turned on at the same time.

[0013] In some implementations, the first switch tube and the second switch tube are MOSFET tubes.

[0014] In some embodiments, the control unit further includes a controller: the controller is configured to simultaneously send driving signals with the same duty cycle to the first switch tube and the second switch tube, so as to simultaneously turn on the first switch tube and the second switch tube.

[0015] In some embodiments, a first capacitor is connected to the first bus, and a second capacitor is connected to the second bus.

[0016] According to another aspect of the present application, a phase-shifted full-bridge bus bias regulation system based on magnetic coupling is provided, comprising a phase-shifted full-bridge topology circuit and the above-mentioned phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling, wherein the phase-shifted full-bridge topology circuit comprises a first phase-shifting circuit and a second phase-shifting circuit; the first bus is connected to one of the first phase-shifting circuit and the second phase-shifting circuit, and the second bus is connected to the other of the first phase-shifting circuit and the second phase-shifting circuit.

[0017] In summary, the phase-shifted full-bridge bus bias regulation circuit and system based on magnetic coupling provided in the present application has at least the following beneficial effects: utilizing transformer magnetic coupling technology and adopting a regulation module to regulate the energy on the bus to solve the bus voltage equalization problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of a phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of a phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling provided in an embodiment of the present application;

[0021] Figure 3 A schematic diagram of a phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling provided in an embodiment of the present application;

[0022] Figure 4 A schematic diagram of a phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling provided in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of a phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling provided in an embodiment of the present application;

[0024] Figure 6 A schematic diagram of a phase-shifted full-bridge bus bias regulation system based on magnetic coupling provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the above and other features and advantages of the present application more clear, the present application is further described below in conjunction with the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explaining to those skilled in the art and are only exemplary and not restrictive.

[0026] In the following description, many specific details are set forth to provide a thorough understanding of the present application. However, it is apparent to those skilled in the art that specific details need not be adopted to practice the present application. In other cases, well-known steps or operations are not described in detail to avoid blurring the present application.

[0027] The present application provides a phase-shifted full-bridge bus bias regulation circuit and system based on magnetic coupling.

[0028] refer to Figure 1 The present application provides a phase-shifted full-bridge bus bias regulation circuit 100 based on magnetic coupling, comprising: a first bus 110, a second bus 120 and a regulation module 130; the first bus 110 and the second bus 120 are used to be connected to the phase-shifted full-bridge topology circuit 200; the regulation module 130 is connected to the first bus 110 and the second bus 120, and the regulation module 130 is configured to be able to regulate the energy on the first bus 110 and / or the second bus 120 when the voltage across the first bus 110 is higher than the voltage across the second bus 120, so that the voltage across the first bus 110 is equal to the voltage across the second bus 120.

[0029] Specifically, the first bus 110 and the second bus 120 can be connected to two phase-shifting circuits in the phase-shifting full-bridge topology circuit, respectively. When the hardware of the two phase-shifting circuits in the phase-shifting full-bridge topology circuit is the same (an ideal state), the effective duty cycles of the two phase-shifting circuits are the same, and the voltages across the first bus 110 and the second bus 120 are the same. However, usually, the hardware of the two phase-shifting circuits will be different, and the effective duty cycles of the two phase-shifting circuits will inevitably be different, and thus the voltages across the first bus 110 and the second bus 120 will be different, which will cause the bias problem of the first bus 110 and the second bus 120.

[0030] In the present application, since the regulating module 130 is added and connected to the first bus 110 and the second bus 120 at the same time, when the voltage at both ends of the first bus 110 is higher than the voltage at both ends of the second bus 120, the regulating module 130 can adjust the energy on the first bus 110 and / or the second bus 120 to clamp the voltage at both ends of the first bus 110 and the second bus 120, so that the voltage at both ends of the first bus 110 and the second bus 120 are the same, thereby achieving bus voltage balancing and improving circuit reliability.

[0031] It should be noted that the first bus 110 can be a positive bus or a negative bus, and correspondingly, the second bus 120 is a negative bus or a positive bus. For example, when the first bus 110 is a positive bus and the second bus 120 is a negative bus, the adjustment module 130 is configured to be able to adjust the energy on the positive bus and / or the negative bus when the voltage across the positive bus is higher than the voltage across the negative bus, so that the voltage across the positive bus is equal to the voltage across the negative bus. Conversely, when the first bus 110 is a negative bus and the second bus 120 is a positive bus, the adjustment module 130 is configured to be able to adjust the energy on the negative bus and / or the positive bus when the voltage across the negative bus is higher than the voltage across the positive bus, so that the voltage across the positive bus is equal to the voltage across the negative bus.

[0032] refer to Figure 2 , the first bus 110 is used to connect to one of the first phase shift circuit 210 and the second phase shift circuit 220 of the phase-shifted full-bridge topology circuit, and the second bus 120 is used to connect to the other of the first phase shift circuit 210 and the second phase shift circuit 220 of the phase-shifted full-bridge topology circuit. In this embodiment, the first bus 110 is connected to the first phase shift circuit 210 of the phase-shifted full-bridge topology circuit, and the second bus 120 is connected to the second phase shift circuit 220 of the phase-shifted full-bridge topology circuit.

[0033] It should be noted that, in the embodiments mentioned herein, the effective duty cycle of the first phase shift circuit 210 connected to the first bus 110 is less than the effective duty cycle of the second phase shift circuit 220 connected to the second bus 120, so that the voltage across the first bus 110 is higher than the voltage across the second bus 120. In other words, the first bus 110 in the present application always refers to the one with a higher voltage between the positive bus and the negative bus.

[0034] The regulating module 130 includes a coupling transformer 131 and a control unit 132. The coupling transformer 131 includes a core (not shown) and a first primary coil T1A and a second primary coil T1B disposed on the core, and the first primary coil T1A and the second primary coil T1B have the same number of turns. The coupling transformer 131 is configured to enable the first primary coil T1A to be controlled to be connected in parallel with the first bus 110 and the second primary coil T1B to be controlled to be connected in parallel with the second bus 120 under the action of the control unit 132.

[0035] In a connection state in which the first primary coil T1A is connected in parallel to the first bus 110 and the second primary coil T1B is connected in parallel to the second bus 120, when there is a hardware difference between the first phase shift circuit 210 and the second phase shift circuit 220, the effective duty cycles of the first phase shift circuit 210 and the second phase shift circuit 220 are different. At this time, the voltage across the first bus 110 is higher than the voltage across the second bus 120. Based on the coupling between the first primary coil T1A and the second primary coil T1B, the energy on the first bus 110 and / or the second bus 120 can be adjusted to make the voltage across the first bus 110 equal to the voltage across the second bus 120.

[0036] In some embodiments of the present invention, the first primary coil T1A and the second primary coil T1B are wound around a core in a bifilar manner, wherein the core may be an iron core or a magnetic core.

[0037] refer to Figure 3-4 In some embodiments of the present invention, a first capacitor C2 is connected to the first bus 110 , and a second capacitor C3 is connected to the second bus 120 .

[0038] The coupling transformer 131 is configured to transfer energy on the first bus 110 to the second bus 120 when the voltage across the first bus 110 is higher than the voltage across the second bus 120 , so that the voltage across the first bus 110 is equal to the voltage across the second bus 120 .

[0039] The control unit 132 includes a first switch tube Q3 and a second switch tube Q8, the first switch tube Q3 is connected in series with the first primary coil T1A, and the second switch tube Q8 is connected in series with the second primary coil T1B; the first switch tube Q3 and the second switch tube Q8 are configured to simultaneously receive drive signals with the same duty cycle to be turned on at the same time. The input ends of the first switch tube Q3 and the second switch tube Q8 are connected to drive signals with the same duty cycle, and the duty cycle can be set to 50%, or can be set according to the load unit, which is not limited in this application. Specifically, the first switch tube Q3 and the second switch tube Q8 can be MOSFET tubes.

[0040] In this embodiment, when there are hardware differences between Q1, Q2, Q4, Q5 and Q6, Q7, Q9, Q10, the effective duty cycles of the first phase shift circuit 210 and the second phase shift circuit 220 are different. At this time, the voltage across the first bus 110 is higher than the voltage across the second bus 120. Based on the coupling between the first primary coil T1A and the second primary coil T1B, the energy on the first bus 110 can be transferred to the second bus 120, so that the voltage across the first bus 110 and the second bus 120 are equal.

[0041] Specifically, using the transformer principle N1:N2=U1:U2, the voltage of C2 is set to U1, and the voltage of C3 is set to U2. Since the coupling transformer 131 is a two-wire parallel winding mode, the number of turns N1 of the first primary coil T1A is the same as the number of turns N2 of the second primary coil T1B. When the voltage of C2 is high, when Q3 and Q8 are turned on at the same time, since the voltage of U1 is higher than the voltage of U2 (at this time, the energy on the first bus 110 is higher than the energy on the second bus 120), based on the coupling between the first primary coil T1A and the second primary coil T1B, the energy on the first bus 110 can be transferred to the second bus 120. At this time, the voltage across the second primary coil T1B will be clamped to a position consistent with the voltage of C2 according to the formula N1:N2=U1:U2, thereby achieving voltage balance between C2 and C3.

[0042] In some embodiments of the present invention, the control unit 132 also includes a controller (not shown), which is configured to simultaneously send drive signals with the same duty cycle to the first switch tube Q3 and the second switch tube Q8 to simultaneously turn on the first switch tube Q3 and the second switch tube Q8.

[0043] refer to Figure 5-6 In some embodiments of the present invention, the coupling transformer 131 further includes a secondary coil T1C and a load unit 133: the secondary coil T1C is connected to the load unit 133; the coupling transformer 131 is configured to transfer the energy on the first bus 110 to the load unit 133 through the secondary coil T1C when the voltage across the first bus 110 is higher than the voltage across the second bus 120, so that the voltage across the first bus 110 is equal to the voltage across the second bus 120. Alternatively, the coupling transformer 131 is configured to transfer the energy on the first bus 110 and the energy on the second bus 120 to the load unit 133 through the secondary coil T1C when the voltage across the first bus 110 is higher than the voltage across the second bus 120, and the energy transferred from the first bus 110 to the load unit 133 is greater than the energy transferred from the second bus 120 to the load unit 133, so that the voltage across the first bus 110 is equal to the voltage across the second bus 120.

[0044] In this embodiment, the secondary coil T1C is connected to the first primary coil T1A and the second primary coil T1B in a bifilar winding manner, and the first primary coil T1A, the second primary coil T1B and the secondary coil T1C have the same number of turns; the energy of the first busbar 110 is provided to the load unit 133 through the first primary coil T1A and the secondary coil T1C; the energy of the second busbar 120 is provided to the load unit 133 through the second primary coil T1B and the secondary coil T1C. When the voltages at both ends of the first busbar 110 and the second busbar 120 are the same, the energy provided to the load unit 133 by the first busbar 110 and the energy provided to the load unit 133 by the second busbar 120 are equal, and the equivalent resistance reflected by the load unit 133 on the first busbar 110 and the second busbar 120 is equal. When the voltage across the first bus 110 is higher than the voltage across the second bus 120, the energy provided by the first bus 110 to the load unit 133 is greater than the energy provided by the second bus 120 to the load unit 133, and the first equivalent resistance reflected by the load unit 133 on the first bus 110 is less than the second equivalent resistance reflected by the load unit 133 on the second bus 120, thereby equalizing the voltage across the first bus 110 and the voltage across the second bus 120.

[0045] In this embodiment, according to the inductor voltage calculation formula v(t)=L*di / dt. L is the inductance, di / dt represents the derivative of the current with respect to time, which can be understood as the speed of the current change. di / dt is the change of the current per unit time. The transformer is wound in parallel with two wires. The number of turns and the inductance of the first primary coil T1A and the second primary coil T1B are consistent. When the voltage across the first bus 110 is high, Q3 and Q8 have the same duty cycle, that is, the opening time (dt). The energy transmitted by the first primary coil TA1 to the secondary coil T1C is greater than that of the second primary coil TB1, and the energy provided by the first bus 110 to the secondary is greater than that of the second bus 120. While consuming the energy of the first bus 110, the first equivalent resistance equivalent to the first bus 110 reflected by the secondary is less than the second equivalent resistance equivalent to the second bus 120. In parallel with the equivalent resistance causing bias of the dual full bridge, the equivalent load resistance on the first bus 110 and the second bus 120 are consistent, thereby achieving a voltage balancing effect.

[0046] In some embodiments of the present invention, the adjustment module 130 further includes a first protection element D2 and a second protection element D3, and the load unit 133 includes a third protection element D1: the first protection element D2 is connected in series with the first primary coil T1A, and the second protection element D3 is connected in series with the second primary coil T1B.

[0047] In this embodiment, the first protection element D2, the second protection element D3 and the third protection element D1 are used to prevent backflow and protect the circuit.

[0048] In some embodiments of the present invention, the first protection element, the second protection element and the third protection element are all diodes.

[0049] refer to Figure 1-2 According to another aspect of the present application, a phase-shifted full-bridge bus bias regulation system 300 based on magnetic coupling is provided, including a phase-shifted full-bridge topology circuit 200 and the above-mentioned phase-shifted full-bridge bus bias regulation circuit 100 based on magnetic coupling, the phase-shifted full-bridge topology circuit 200 includes a first phase-shifting circuit 210 and a second phase-shifting circuit 220; the first bus 110 is connected to one of the first phase-shifting circuit 210 and the second phase-shifting circuit 220, and the second bus 120 is connected to the other of the first phase-shifting circuit 210 and the second phase-shifting circuit 220.

[0050] It should be noted that in practical applications, the resistors or capacitors in the circuit can be adjusted as needed. For example, the setting position of the resistor or capacitor can be adjusted, or the setting number of the resistor or capacitor can be adjusted, such as increasing the number of resistors or capacitors, reducing the number of resistors or capacitors, or not setting resistors or capacitors, etc., and this application does not limit this.

[0051] It should be noted that Figure 1-Figure 6 The devices and connection relationships are schematic illustrations and can be adjusted as needed, and this application does not limit this.

[0052] It should be understood that each module / unit of the device of the present application can be implemented in whole or in part by software, hardware, firmware or a combination thereof. Each module / unit can be embedded in the processor of the electronic device or independent of the processor in the form of hardware or firmware, or can be stored in the memory of the electronic device in the form of software for the processor to call to perform the operation of each module / unit. Each module / unit can be implemented as an independent component or module, or two or more modules / units can be implemented as a single component or module.

[0053] The various technical features described above can be combined arbitrarily. Although all possible combinations of these technical features are not described, any combination of these technical features should be considered to be covered by this specification as long as there is no contradiction in such combination.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling, characterized in that: include: A first busbar, a second busbar and a regulation module; The first busbar and the second busbar are used to be connected to a phase-shifted full-bridge topology circuit; The regulation module is connected to the first bus and the second bus, and the regulation module is configured to regulate the energy on the first bus and / or the second bus when the voltage across the first bus is higher than the voltage across the second bus, so that the voltage across the first bus is equal to the voltage across the second bus.

2. The phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling according to claim 1 is characterized in that: The regulation module includes a coupling transformer and a control unit: The coupling transformer comprises a core and a first primary coil and a second primary coil arranged on the core, and the first primary coil and the second primary coil have the same number of turns; The coupling transformer is configured to enable the first primary coil to be controlled to be connected in parallel with the first bus and the second primary coil to be controlled to be connected in parallel with the second bus under the action of the control unit, so as to regulate the energy on the first bus and / or the second bus when the voltage across the first bus is higher than the voltage across the second bus.

3. The phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling according to claim 2 is characterized in that: The first primary coil and the second primary coil are wound around the core in a bifilar manner; The core is an iron core or a magnetic core.

4. The phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling according to claim 2 is characterized in that: The coupling transformer is configured to transfer energy on the first bus to the second bus when the voltage across the first bus is higher than the voltage across the second bus, so that the voltage across the first bus is equal to the voltage across the second bus.

5. The phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling according to claim 2 is characterized in that: The coupling transformer also includes a secondary coil and a load unit: The secondary coil is connected to the load unit; The coupling transformer is configured to transfer energy on the first bus to the load unit through the secondary coil when the voltage across the first bus is higher than the voltage across the second bus, so that the voltage across the first bus is equal to the voltage across the second bus; or The coupling transformer is configured to transfer energy on the first bus and energy on the second bus to the load unit through the secondary coil when the voltage across the first bus is higher than the voltage across the second bus, and the energy transferred from the first bus to the load unit is greater than the energy transferred from the second bus to the load unit, so that the voltage across the first bus is equal to the voltage across the second bus.

6. The phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling according to claim 5, characterized in that: The regulating module further includes a first protection element and a second protection element, and the load unit includes a third protection element: The first protection element is connected in series with the first primary coil, and the second protection element is connected in series with the second primary coil.

7. The phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling according to claim 6, characterized in that: The first protection element, the second protection element and the third protection element are all diodes.

8. The phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling according to claim 2, characterized in that: The control unit includes a first switch tube and a second switch tube, the first switch tube is connected in series with the first primary coil, and the second switch tube is connected in series with the second primary coil; The first switch tube and the second switch tube are configured to simultaneously receive driving signals with the same duty cycle so as to be turned on simultaneously.

9. The phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling according to claim 8, characterized in that: The first switch tube and the second switch tube are MOSFET tubes.

10. The phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling according to claim 8, characterized in that: The control unit also includes a controller: The controller is configured to send driving signals with the same duty cycle to the first switch tube and the second switch tube at the same time, so as to turn on the first switch tube and the second switch tube at the same time.

11. The phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling according to any one of claims 1 to 10, characterized in that: The first busbar is connected to a first capacitor, and the second busbar is connected to a second capacitor.

12. A phase-shifted full-bridge bus bias regulation system based on magnetic coupling, characterized in that: It comprises a phase-shifted full-bridge topology circuit and a phase-shifted full-bridge bus bias regulation circuit based on magnetic coupling according to any one of claims 1 to 11, wherein the phase-shifted full-bridge topology circuit comprises a first phase-shifted circuit and a second phase-shifted circuit; The first busbar is connected to one of the first phase-shifting circuit and the second phase-shifting circuit, and the second busbar is connected to the other of the first phase-shifting circuit and the second phase-shifting circuit.

Images