High-performance multi-channel output driver power supply and low-coupling capacitance multi-channel transformer

Abstract

The present invention belongs to the field of power electronics technology and discloses a high-performance multi-channel output driving power supply and a low-coupling capacitance multi-channel transformer. The low-coupling capacitance multi-channel transformer comprises: a pair of magnetic cores, a group of primary windings and N groups of secondary windings, where N>2; wherein, a magnetic core comprises a primary magnetic column and N secondary magnetic columns, and the N secondary magnetic columns are evenly surrounded on a circumference with the primary magnetic column as the center; the primary winding is wound on the primary magnetic column, and the N groups of secondary windings are respectively wound on corresponding secondary magnetic columns; in this way, the primary-secondary coupling capacitance is effectively reduced to limit the common-mode current excited by the high-speed action of the switching device; based on the above-mentioned multi-output transformer, a high-performance multi-channel output driving power supply is also provided. By configuring a post-stage voltage regulation circuit in the driving power supply, the cross-regulation rate of the multi-channel output is effectively reduced, thereby ensuring the consistency and stability of the operation of the switching device in the power module.

Description

Technical Field

[0001] The present invention belongs to the technical field of power electronics, and more particularly, relates to a high-performance multi-channel output driving power supply and a low-coupling-capacitance multi-channel transformer. Background Art

[0002] Silicon carbide (SiC) is a typical representative of the third generation of semiconductor materials. Compared with Si materials, it has a wider bandgap, higher saturation electron velocity, higher electron mobility, smaller dielectric constant and better conductivity, which gives SiC devices obvious advantages in high-frequency, high-voltage and high-temperature applications. In recent years, high-voltage SiC-MOSFET (10kV / 15kV) has developed rapidly. Compared with Si-IGBT of the same voltage level, it has a higher switching frequency, faster switching speed and lower switching loss. It is hailed as the "game changer" for the next generation of medium and high voltage power conversion. Using high-voltage SiC-MOSFET instead of high-voltage Si-IGBT can greatly increase the switching frequency and achieve compactness, miniaturization and lightweighting of medium and high voltage converters.

[0003] High-performance SiC driver modules, including drivers and power supplies, are crucial for fully leveraging the advantages of high-voltage SiC-MOSFETs. The power supply, the source of power for the SiC driver module, not only directly impacts the reliability of the SiC-MOSFET driver but also indirectly affects the reliability of the entire converter. For multi-transistor integrated high-voltage SiC-MOSFET modules, using multiple single-output power supplies for one-to-one power supply inevitably increases system cost and complexity, increases the probability of failure, and reduces device reliability. Replacing a single-output power supply with a multi-isolated output power supply allows for a single or small number of power supplies to be configured in a one-to-many fashion to meet the SiC power module's power supply needs, significantly simplifying the power architecture of the SiC power supply system.

[0004] Considering the high-voltage and high-speed operating characteristics of high-voltage SiC-MOSFETs, their driver power supplies must have high isolation voltage and low coupling capacitance (<5pF). The flagship commercial high-isolation driver power supply MGJ2 series, represented by Japan's Murata, has a primary-to-secondary coupling capacitance as low as 3pF, meeting the power supply requirements of high-voltage SiC drivers, but it only has a single output. The multi-channel isolated output driver power supply MGJ6 series can directly supply full-bridge and three-phase modules, but the primary-to-secondary coupling capacitance is as high as 15pF, which cannot suppress the common-mode interference hazards caused by the high-speed operation (>50V / ns) of high-voltage SiC devices. Currently, research on high-voltage SiC multi-channel isolated output driver power supplies is still in its infancy. Prior art discloses a multi-channel isolated driver power supply with a regulated output. Its transformer uses a centralized winding method, resulting in a primary-to-secondary coupling capacitance exceeding 7pF. Furthermore, coupling exists between the magnetic circuits on the secondary side of the transformer, hindering the optimization of the transformer structure. A multi-channel output high-isolation driving power supply based on current transformer was also proposed. Although the primary-secondary coupling capacitance was reduced to 1.67pF to a certain extent, the multi-channel output relied on a single high-voltage AC current bus, which posed a single-point failure risk and insufficient reliability of the driving power supply.

[0005] In addition, the switching performance of high-voltage SiC-MOSFETs is very sensitive to driving voltage fluctuations. It is necessary to reduce the cross-regulation rate between the outputs of the multi-channel isolated output driving power supply to ensure the stability and consistency of the driving voltage. The prior art discloses a multi-channel isolated output driving power supply based on a voltage-clamped forward topology. The number of output channels can be expanded by adding secondary windings, but the cross-regulation rate of the multi-channel output is relatively high. There is also a multi-channel output driving power supply based on a "domino" type wireless power transmission system. However, due to the presence of parasitic parameters, the port output voltage will inevitably decrease step by step, affecting the consistency of the driving voltage. Summary of the Invention

[0006] In response to the above defects or improvement needs of the prior art, the present invention provides a high-performance multi-channel output driving power supply and a low-coupling-capacitance multi-channel transformer, the purpose of which is to reduce the primary-secondary coupling capacitance of the multi-channel transformer.

[0007] To achieve the above objectives, the present invention provides a low-coupling capacitance multi-output transformer, comprising: a pair of magnetic cores, a group of primary windings, and N groups of secondary windings, where N>2; wherein one magnetic core comprises a primary magnetic column and N secondary magnetic columns, and the N secondary magnetic columns are evenly arranged on a circle with the primary magnetic column as the center; the primary winding is wound on the primary magnetic column, and the N groups of secondary windings are respectively wound on corresponding secondary magnetic columns.

[0008] Furthermore, each of the secondary magnetic columns has an air gap.

[0009] Furthermore, the primary winding and the N groups of secondary windings are wound wire windings, or planar windings based on a printed circuit board.

[0010] The present invention also provides a high-performance multi-channel voltage-stabilized output driving power supply, comprising: a primary circuit, N secondary circuits, N voltage regulating circuits, and any of the above-mentioned low-coupling capacitance multi-output transformers;

[0011] The input end of the primary circuit is the input end of the multi-channel voltage-regulated output driving power supply, the output end of the primary circuit is connected to the input end of the low-coupling capacitance multi-output transformer, the n-th output end of the low-coupling capacitance multi-output transformer, the n-th secondary circuit and the input end of the n-th voltage regulating circuit are connected in sequence, and the output ends of the N-channel voltage regulating circuits are respectively the output ends of the multi-channel voltage-regulated output driving power supply, n=1, 2, ..., N;

[0012] The primary circuit is used to convert the input direct current into high-frequency alternating current;

[0013] The low-coupling capacitance multi-output transformer is used to perform voltage conversion on the high-frequency alternating current and output N high-frequency alternating currents;

[0014] The nth secondary circuit is used to convert the high-frequency alternating current outputted by the nth output of the low-coupling-capacitance multi-output transformer into a corresponding direct current;

[0015] The n-th voltage regulating circuit includes a main circuit and a control circuit. The main circuit is used to transmit the received direct current to the load. The control circuit is used to perform closed-loop feedback control on the sampled output voltage of the main circuit, so that when the load or the input of the multi-channel voltage-regulated output driving power supply changes within a certain range, the output voltage of the main circuit remains constant.

[0016] Furthermore, the primary circuit includes an inverter circuit and a primary compensation circuit;

[0017] The inverter circuit is used to realize the inversion of input direct current into high-frequency alternating current; the primary side compensation circuit is used to compensate for the parasitic parameters of the primary side of the low-coupling capacitance multi-output transformer.

[0018] Furthermore, the inverter circuit is a single-ended inverter circuit, a push-pull inverter circuit, a half-bridge inverter circuit or a full-bridge inverter circuit; and the primary side compensation circuit is a series compensation circuit, a parallel compensation circuit or a series-parallel compensation circuit.

[0019] Furthermore, each secondary circuit includes a secondary compensation network, a rectifier circuit and a filter circuit;

[0020] The secondary side compensation network is used to compensate for parasitic parameters of the secondary side of the low coupling capacitance multi-output transformer;

[0021] The rectifier circuit is used to convert the high-frequency alternating current outputted by the nth path of the low-coupling-capacitance multi-output transformer into corresponding direct current;

[0022] The filter circuit is used to filter out the AC component in the output voltage of the rectifier circuit.

[0023] Furthermore, the secondary side compensation network is a series compensation, parallel compensation or series-parallel compensation network;

[0024] The rectifier circuit is a half-wave rectifier circuit, a full-wave rectifier circuit or a bridge rectifier circuit.

[0025] Furthermore, the main circuit of each voltage regulation circuit is a buck converter, a boost converter or a buck-boost converter.

[0026] The present invention also provides a driving and powering method for a multi-tube integrated switching device in a medium- and high-voltage converter, comprising: using any of the above-mentioned high-performance multi-channel voltage-regulated output driving power supplies to drive and power the multi-tube integrated switching device in the medium- and high-voltage converter.

[0027] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects:

[0028] (1) The low-coupling capacitance multi-output transformer designed by the present invention has a secondary magnetic column evenly wrapped around a circle with the primary magnetic column as the center. The primary winding and the multiple secondary windings are wound on different magnetic columns, which reduces the facing area between the primary and secondary windings and effectively reduces the direct coupling capacitance C between the primary and secondary windings. pw-sw , thereby significantly reducing the equivalent coupling capacitance C between the primary and secondary windings of the multi-output transformer ps ; Moreover, compared with a multi-output transformer in which the primary and secondary windings are wound on the same magnetic column, the electric field coupling between the primary winding and each group of secondary windings affects each other, making it difficult to optimize the primary-secondary coupling capacitance; the multi-output transformer designed in the present invention can reduce the mutual influence of the electric field coupling between the primary winding and each group of secondary windings, and the law of the change of the transformer coupling capacitance with the structural parameters is clear and intuitive (when the radius of the primary and secondary windings increases, the distance between the winding and the corresponding magnetic column will increase, so the coupling capacitance between the winding and the magnetic core will decrease, and the distance between the primary and secondary windings decreases, which will lead to the direct coupling capacitance C between the primary and secondary windings). pw-sw Increase), thereby reducing the difficulty of optimizing the primary-secondary coupling capacitance and ultimately reducing the common-mode current. Test examples also verify that the equivalent coupling capacitance in the present invention can be as low as 0.53pF, which is much lower than the existing technology.

[0029] (2) The low-coupling capacitance multi-output transformer proposed in the present invention has a plurality of secondary magnetic columns in its magnetic core evenly arranged on a circumference with the primary magnetic column as the center, which can ensure the symmetry of the entire magnetic core and thus ensure the consistency of the outputs of each transformer. When it is applied to a multi-channel regulated output driving power supply, the consistency of the outputs of each driving power supply can be guaranteed.

[0030] (3) Furthermore, based on the low-coupling capacitance multi-output transformer designed by the present invention, the magnetic circuits of the secondary windings are spatially separated by winding N groups of secondary windings on different secondary magnetic poles respectively. An air gap is opened in each secondary magnetic pole to increase the magnetic resistance of the secondary magnetic circuit, thereby realizing the magnetic flux decoupling of the N groups of secondary sides, that is, realizing the magnetic circuit decoupling of multiple secondary sides, and then realizing the decoupling between the multiple secondary outputs. When it is applied to a multi-channel voltage-regulated output driving power supply, the cross-regulation rate between the outputs of the multi-channel voltage-regulated output driving power supply is reduced.

[0031] (4) Furthermore, based on the low-coupling capacitance multi-output transformer designed by the present invention, the present invention provides a new multi-channel voltage-stabilized output driver power supply topology structure, which is a high-performance multi-channel voltage-stabilized output driver power supply with low cross-regulation rate and low coupling capacitance. Specifically, by setting a corresponding voltage regulating circuit for each secondary circuit, the output voltage of each voltage regulating circuit is used as the control quantity, and the output voltage is closed-loop controlled, so that when the load or the input of the multi-channel voltage-stabilized output driver power supply changes within a certain range, the output voltage of each main circuit remains constant, thereby realizing independent regulation of each output of the multi-channel voltage-stabilized output driver power supply. In this way, the N-channel output voltage of the driver power supply is not only immune to the influence of input voltage fluctuations, but also does not change with the load change of the branch, and is not affected by the load change of the other output branches, thereby reducing the linear regulation rate, load regulation rate and cross regulation rate of the multi-channel driver power supply, and improving the stability of the high-voltage SiC driver power supply. In theory, the cross regulation rate between the outputs of the multi-channel voltage-stabilized output driver power supply in the present invention is 0. In addition, the present invention uses only one low-coupling multi-output transformer to achieve N-channel output, reducing the risk of single-point failure and improving the reliability of SiC drive power supply.

[0032] (5) The low-coupling capacitance multi-output transformer designed by the present invention has N groups of secondary windings symmetrically arranged on a circle with the primary winding as the center. When it is applied to a multi-channel voltage-stabilized output drive power supply, the symmetry of the circuit parameters and magnetic circuit parameters of the multi-channel secondary sides is ensured, and the consistency of the drive voltage is improved.

[0033] (6) Compared with single-channel output drive power supplies and dual-channel output drive power supplies, the drive power supply proposed in the present invention has multiple output ports isolated from each other, which can provide reliable drive power supply for the drivers of multi-tube integrated switching device modules in medium and high voltage converters in a one-to-many manner, thereby simplifying the high-voltage SiC drive power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is an example diagram of a multi-output transformer in an embodiment of the present invention;

[0035] Figure 2 This is a diagram of a multi-channel voltage-stabilized output driver power supply architecture according to an embodiment of the present invention;

[0036] Figure 3 This is a topological diagram of a four-way voltage-stabilized output drive power supply according to an embodiment of the present invention;

[0037] Figure 4 is an example diagram of a four-output transformer in an embodiment of the present invention;

[0038] Figure 5 1 is a steady-state operating waveform of a multi-channel voltage-stabilized output driving power supply according to an embodiment of the present invention, wherein the solid line is the output voltage waveform and the dotted line is the output current waveform;

[0039] Figure 6 The dynamic operating waveform of the multi-channel voltage-stabilized output driving power supply in the embodiment of the present invention when the input voltage changes suddenly. The solid line in the figure is the output voltage waveform, and the dotted line is the output current waveform;

[0040] Figure 7 The dynamic working waveform of the multi-channel voltage-stabilized output driving power supply in the embodiment of the present invention when the load changes suddenly. The solid line in the figure is the output voltage waveform, and the dotted line is the output current waveform;

[0041] Figure 8 1 is a diagram showing the electric field intensity distribution of a multi-output transformer in an embodiment of the present invention;

[0042] Figure 9 This is an application example of a multi-channel voltage-regulated output drive power supply in an embodiment of the present invention; (a)-(c) in the figure are multi-channel voltage-regulated output drive power supplies for a full-bridge switch device module, a T-shaped three-level bridge arm module and a three-phase switch device module, respectively. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0044] In the present invention, the terms "first", "second", etc. in the present invention and the accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0045] Example 1

[0046] like Figure 1 As shown, an embodiment of the present invention provides a low-coupling capacitance multi-output transformer, comprising: a pair of magnetic cores, a group of primary windings and N groups of secondary windings, N>2, wherein one of the magnetic cores includes a primary magnetic column and N secondary magnetic columns, and the N secondary magnetic columns are evenly surrounded on a circle with the primary magnetic column as the center; the primary winding is wound on the primary magnetic column, and the N groups of secondary windings are respectively wound on the corresponding secondary magnetic columns; the primary winding is connected to the output end of the primary circuit, and the N groups of secondary windings are respectively connected to the input ends of the N secondary circuits.

[0047] The multi-output transformer in the embodiment of the present invention is used to achieve voltage coordination between the primary and secondary sides and meet the high isolation requirement (>3kV) of the driving power supply.

[0048] Furthermore, each secondary magnetic column of the low-coupling capacitance multi-output transformer in the embodiment of the present invention has an air gap. By winding N groups of secondary windings on different secondary magnetic columns respectively, the magnetic circuits of the secondary windings are separated in space. The air gap formed in each secondary magnetic column increases the magnetic resistance of the secondary magnetic circuit, thereby realizing the decoupling of the magnetic flux of the N groups of secondary sides, that is, realizing the decoupling of the magnetic circuits of multiple secondary sides, and then realizing the decoupling between the multiple secondary outputs. When it is applied to a multi-channel voltage-regulated output driver power supply, the cross-regulation rate between the outputs of the multi-channel voltage-regulated output driver power supply is reduced.

[0049] Preferably, in order to meet the high isolation requirement of the driving power supply, the primary winding and the N groups of secondary windings can adopt either wire winding or planar winding based on a printed circuit board.

[0050] Based on the multi-output transformer designed above, the equivalent coupling capacitance C between the primary winding of the multi-output transformer and a set of secondary windings is ps for:

[0051]

[0052] Among them, C pw-swis the direct coupling capacitance between the primary winding and a set of secondary windings, C pw-c is the coupling capacitance between the primary winding and the entire magnetic core, C sw-c is the coupling capacitance between a set of secondary windings and the entire magnetic core, Used to characterize the equivalent coupling capacitance between the primary winding, a set of secondary windings and the magnetic core.

[0053] Based on the above formula, it can be found that when the radius of the primary winding or the secondary winding increases, the distance between the winding and the corresponding magnetic column will increase, so the coupling capacitance C between the winding and the magnetic core will increase. pw-c and C sw-c Will reduce, thereby reducing the primary and secondary equivalent coupling capacitance C ps The distance between the primary and secondary windings decreases, which will lead to the direct coupling capacitance C between the primary and secondary windings. pw-sw Therefore, with the help of finite element simulation, the optimization of transformer structural parameters can be achieved in the multi-output transformer designed in the present invention to minimize the primary-secondary equivalent coupling capacitance C ps Therefore, based on the designed multi-output transformer, the mutual influence of electric field coupling between the primary winding and each set of secondary windings can be reduced. The law of change of transformer coupling capacitance with structural parameters is clear and intuitive, thereby reducing the difficulty of optimizing the primary and secondary coupling capacitance.

[0054] In particular, the multi-output transformer winds the primary winding and the multi-way secondary winding on different magnetic poles, which reduces the facing area between the primary and secondary windings and effectively reduces the direct coupling capacitance C between the primary and secondary windings. pw-sw , thereby significantly reducing the equivalent coupling capacitance C between the primary and secondary windings of the multi-output transformer ps .

[0055] Example 2

[0056] like Figure 2 As shown, an embodiment of the present invention provides a high-performance multi-channel voltage-regulated output driving power supply, including a primary circuit, a multi-output transformer, N secondary circuits and N voltage regulating circuits, N>2; wherein the multi-output transformer is the low-coupling capacitance multi-output transformer in the above-mentioned embodiment 1.

[0057] The input end of the primary circuit serves as the input end of the multi-channel voltage-regulated output driving power supply, the output end of the primary circuit is connected to the input end of the multi-output transformer, the n-th output end of the multi-output transformer, the n-th secondary circuit, and the input end of the n-th voltage regulating circuit are connected in sequence, and the N output ends of the N-channel voltage regulating circuit respectively serve as the output ends of the multi-channel voltage-regulated output driving power supply; wherein n=1, 2, ..., N.

[0058] The primary circuit is used to convert the input DC power into high-frequency AC power;

[0059] The multi-output transformer is used to convert the voltage of the high-frequency alternating current output by the primary circuit and output N high-frequency alternating currents;

[0060] The nth secondary circuit is used to convert the high-frequency alternating current outputted by the nth output transformer into a corresponding direct current;

[0061] The nth voltage regulating circuit includes a main circuit and a control circuit. The main circuit is used to transmit the received DC power to the load, and the control circuit is used to sample the voltage V at the output end of the main circuit. on (n=1,2,…,N), and perform closed-loop feedback control on the sampled voltage, so that when the load or the input of the multi-channel regulated output drive power supply changes within a certain range, the output voltage V on (n=1,2,…,N) remains constant.

[0062] Preferably, the primary circuit includes an inverter circuit and a primary compensation circuit. The inverter circuit is used to convert DC power to AC power and can adopt a single-ended inverter circuit, a push-pull inverter circuit, a half-bridge inverter circuit, a full-bridge inverter circuit, etc. The primary compensation circuit is used to compensate for the parasitic parameters of the primary side of the multi-output transformer and can adopt series compensation, parallel compensation, or series-parallel compensation.

[0063] Preferably, each secondary circuit includes a secondary compensation network, a rectifier circuit, and a filter circuit. The secondary compensation network is used to compensate for parasitic parameters of the secondary side of the multi-output transformer and can employ series compensation, parallel compensation, or series-parallel compensation. The rectifier circuit is used to rectify AC to DC and can employ half-wave rectifier circuits, full-wave rectifier circuits, and bridge rectifier circuits. The filter circuit is used to remove the AC component from the output voltage of the rectifier circuit to obtain a smooth DC voltage.

[0064] In the embodiment of the present invention, each voltage regulating circuit is used to stabilize the output voltage of the driving power supply so that the output voltage is not affected by input voltage fluctuations and load changes.

[0065] Preferably, the main circuit of each voltage regulating circuit adopts a switching power supply such as a buck converter, a boost converter or a buck-boost converter, and the specific circuit structure is determined according to the application requirements of the load.

[0066] The following is based on Figure 3 , and combined with Figure 4-Figure 9 The performance of the multi-output transformer and the multi-channel voltage-stabilized output driving power supply in the present invention is tested. in is the input voltage of the multi-channel regulated output driver power supply, C p is the primary series compensation capacitor, C sn They are the series compensation capacitor of the nth secondary side, V on are the output voltage of the nth branch, Ion are the output currents of the n-th branch respectively. In the embodiment of the present invention, n=1, 2, 3, 4, that is, N=4.

[0067] Figure 3 An example diagram of a four-way voltage-stabilized output driving power supply proposed in an embodiment of the present invention is given.

[0068] In the figure, the inverter circuit adopts a half-bridge inverter circuit; the primary side compensation network and the secondary side compensation network both adopt series compensation, where C p Compensate for the transformer's primary leakage inductance and self-inductance, C sn (n=1,2,3,4) compensates for the secondary leakage inductance and self-inductance of the transformer; the rectifier circuit adopts a bridge rectifier circuit; the filter circuit adopts an inductor-capacitor low-pass filter circuit; the voltage regulation circuit adopts a Boost step-up conversion circuit.

[0069] Figure 4 The following is an example diagram of a four-output transformer according to an embodiment of the present invention. In the diagram, the windings are planar windings based on a printed circuit board. For the sake of readability, the wiring and terminals other than the windings are hidden.

[0070] Test example 1:

[0071] Figure 5 The steady-state operating waveforms of a multi-channel regulated output driver power supply under rated operating conditions are presented for an embodiment of the present invention. Specifically, a four-channel regulated output driver power supply is used as an example. It can be seen that the proposed multi-channel regulated output driver power supply achieves stable multi-channel outputs and can be used to provide reliable drive power to drivers of multi-transistor integrated switching device modules in a one-to-many manner.

[0072] The main parameters used in test case 1 are as follows:

[0073] Input voltage range: 40V~60V

[0074] Rated input voltage: 48V

[0075] ●Single-channel rated output voltage: 24V

[0076] ●Single channel rated output current: 0.1A

[0077] ●Number of output branches: 4

[0078] Primary circuit switching frequency: 100kHz

[0079] ●Voltage regulation circuit switching frequency: 200kHz

[0080] ●Filter circuit inductance: 15μH

[0081] ●Filter circuit capacitor: 10μF

[0082] Boost voltage regulation circuit inductor: 68μH

[0083] Output capacitance: 10μF

[0084] Test Example 2:

[0085] Taking the four-way voltage-stabilized output driving power supply in the embodiment of the present invention as an example, Figure 4 and Figure 5 Its dynamic working waveform is given.

[0086] Figure 6 The output voltage waveforms of the four-channel regulated output driver are shown when the input voltage varies between 40 V and 60 V. It can be seen that when the input voltage changes, the multiple output voltages of the multi-channel regulated output driver remain stable, with good linear regulation characteristics.

[0087] Figure 7 The operating waveforms of the four-channel regulated output driver power supply are shown when the load on branch 2 changes suddenly between half load and full load. The solid line shows the output voltage waveform, and the dashed line shows the output current waveform. As can be seen, during the sudden load change on branch 2, not only does the output voltage of branch 2 itself remain stable, but the output voltages of the remaining branches also remain stable. This demonstrates that the multi-channel regulated output driver power supply exhibits excellent load regulation and cross-regulation characteristics.

[0088] Test Example 3:

[0089] Figure 8 The key electric field strength distribution diagram of the four-output transformer in the embodiment of the present invention is given. It can be seen that the maximum electric field strength in the transformer is 2.85kV / mm. Considering that the breakdown field strength of air is 3kV / mm, the transformer meets the high insulation requirements of the high-voltage SiC drive power supply. The coupling capacitances between the four sets of secondary windings and the primary windings of the transformer are C ps1 =0.53pF, C ps2 =0.53pF, C ps3 =0.55pF, C ps4 =0.55pF. It can be seen that the transformer meets the low coupling capacitance requirement of the high-voltage SiC drive power supply.

[0090] The main parameters used in test case 3 are as follows:

[0091] ●Working voltage: 6kV

[0092] ●Core material: DMR95

[0093] ●Effective cross-sectional area of ​​core: 66mm 2

[0094] ●Effective magnetic path length of core: 40mm

[0095] Air gap length: 0.2mm

[0096] Winding thickness: 2oz

[0097] Winding width: 30mil

[0098] ●Number of primary winding turns: 4 turns

[0099] ●Number of turns of secondary winding: 2 turns

[0100] Primary winding side length: 6.6mm

[0101] Secondary winding side length: 4.3mm

[0102] Application examples:

[0103] Figure 9 Graphs (a) through (c) illustrate examples of the application of the proposed multi-channel voltage-regulated drive power supply in a full-bridge switching device module, a T-shaped three-level bridge arm module, and a three-phase switching device module, respectively. This demonstrates that the multi-channel voltage-regulated drive power supply can provide stable and reliable power to the drivers of multi-transistor integrated switching device modules in medium- and high-voltage converters, in a one-to-many manner.

[0104] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-performance multi-channel voltage-stabilized output driver power supply, characterized in that: include: Primary circuit, N Road side circuit, N 1-way voltage regulating circuit and low coupling capacitance multi-output transformer; The low coupling capacitance multi-output transformer comprises: a pair of magnetic cores, a set of primary windings and N Secondary winding of the group, N >2; wherein a magnetic core includes a primary magnetic column and N Secondary magnetic poles, N The secondary magnetic columns are evenly surrounded on the circumference with the primary magnetic column as the center; the primary winding is wound on the primary magnetic column, N The secondary windings of each group are wound on the corresponding secondary magnetic poles respectively; The input end of the primary circuit is the input end of the multi-channel voltage-stabilized output driving power supply, and the output end of the primary circuit is connected to the input end of the low-coupling capacitance multi-output transformer. n Output terminal, n Secondary circuit and n The voltage regulating circuits are connected in sequence, N The output ends of the three voltage regulating circuits are respectively the output ends of the multi-channel voltage regulated output driving power supplies, n =1, 2,…, N ; The primary circuit is used to convert the input direct current into high-frequency alternating current; the low-coupling capacitance multi-output transformer is used to convert the voltage of the high-frequency alternating current and output N High frequency alternating current; n The secondary side circuit is used to connect the low coupling capacitor multi-output transformer n The high-frequency alternating current output by the first circuit is converted into the corresponding direct current; n The multi-channel voltage regulation circuit includes a main circuit and a control circuit, wherein the main circuit is used to transmit the received DC power to the load, and the control circuit is used to perform closed-loop feedback control on the sampled output voltage of the main circuit, so that when the load or the input of the multi-channel voltage-regulated output driving power supply changes within a certain range, the output voltage of the main circuit remains constant; Equivalent coupling capacitance between the primary winding of a multi-output transformer and a set of secondary windings for: in, C pw-sw is the direct coupling capacitance between the primary winding and a set of secondary windings, C pw-c is the coupling capacitance between the primary winding and the entire magnetic core, C sw-c is the coupling capacitance between a set of secondary windings and the entire magnetic core, Used to characterize the equivalent coupling capacitance between the primary winding, a set of secondary windings and the magnetic core.

2. The high-performance multi-channel voltage-stabilized output driving power supply according to claim 1, characterized in that: Each of the secondary magnetic columns has an air gap.

3. The high-performance multi-channel voltage-stabilized output driving power supply according to claim 2, characterized in that: The primary winding and N The secondary winding of the group adopts wire winding or planar winding based on printed circuit board.

4. The high-performance multi-channel voltage-stabilized output driving power supply according to claim 1, characterized in that: The primary circuit includes an inverter circuit and a primary compensation circuit; The inverter circuit is used to realize the inversion of input direct current into high-frequency alternating current; the primary side compensation circuit is used to compensate for the parasitic parameters of the primary side of the low-coupling capacitance multi-output transformer.

5. The high-performance multi-channel voltage-stabilized output driving power supply according to claim 4, characterized in that: The inverter circuit is a single-ended inverter circuit, a push-pull inverter circuit, a half-bridge inverter circuit or a full-bridge inverter circuit; the primary side compensation circuit is a series compensation circuit, a parallel compensation circuit or a series-parallel compensation circuit.

6. The high-performance multi-channel voltage-stabilized output driving power supply according to claim 1, characterized in that: Each secondary circuit includes a secondary compensation network, a rectifier circuit and a filter circuit; The secondary side compensation network is used to compensate for parasitic parameters of the secondary side of the low coupling capacitance multi-output transformer; The rectifier circuit is used to connect the low coupling capacitance multi-output transformer n The high-frequency alternating current output by the circuit is converted into corresponding direct current; The filter circuit is used to filter out the AC component in the output voltage of the rectifier circuit.

7. The high-performance multi-channel voltage-stabilized output driving power supply according to claim 6, characterized in that: The secondary side compensation network is a series compensation, parallel compensation or series-parallel compensation network; The rectifier circuit is a half-wave rectifier circuit, a full-wave rectifier circuit or a bridge rectifier circuit.

8. The high-performance multi-channel voltage-stabilized output driving power supply according to claim 1, characterized in that: The main circuit of each voltage regulation circuit is a buck converter, a boost converter or a buck-boost converter.

9. A driving and power supply method for a multi-tube integrated switch device in a medium- and high-voltage converter, characterized in that: include: The high-performance multi-channel voltage-stabilized output driving power supply according to any one of claims 1 to 8 is used to drive and supply power to the multi-tube integrated switching device in the medium and high voltage converter.

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