H-bridge fast-control power supply and electronic device using the power supply

Abstract

The present invention discloses an H-bridge fast-control power supply and an electronic device using the power supply. The power supply comprises an energy supply device and at least two H-bridge output main circuits connected to the output end of the energy supply device; each H-bridge output main circuit comprises a phase-shifting transformer and four integrated power devices; the positive output end of the first integrated power device is bridged to the negative output end of the second integrated power device to form a power supply branch, and the positive output end of the third integrated power device is bridged to the negative output end of the fourth integrated power device to form another power supply branch; the negative output end of the first integrated power device is connected to the negative output end of the third integrated power device to form the negative output of the two power supply branches; the positive output end of the second integrated power device is connected to the positive output end of the fourth integrated power device to form the positive output of the two power supply branches; the present invention adopts a cascade mode of multiple H-bridge output main circuits, so that the H-bridge fast-control power supply meets the rated voltage requirement of the external load and realizes four-quadrant operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of power electronics application, and more specifically, relates to an H-bridge fast-control power supply and its application, and is particularly applicable to a controlled nuclear fusion Tokamak device. Background Art

[0002] H-bridge fast-control power supply belongs to fast-response large-current inverter, which is widely used in power control of controlled nuclear fusion tokamak device. Existing H-bridge fast-control power supply generally operates in three quadrants, such as the patent document "A fast-control power supply system with MMC structure based on H-bridge submodule" with application announcement number CN 108173436A and the patent document "A fast-control power supply system and control method" with application announcement number CN 106787929A, which provide power supply that can only operate in three quadrants. At present, there are few power supplies that can operate in four quadrants, and the power cannot meet the requirements of rated voltage of ±1000V and rated current of ±4kA.

[0003] On the one hand, the four-quadrant power supply can realize the bidirectional flow of energy, and on the other hand, it has less pollution to the power grid when it is running at high power. Therefore, it is necessary to develop a fast-controlled power supply that can operate in four quadrants to improve the working efficiency of the power supply and reduce the pollution to the power grid. Summary of the invention

[0004] In view of at least one defect or improvement demand of the prior art, the present invention provides an H-bridge fast control power supply and an electronic device using the power supply.

[0005] To achieve the above object, according to one aspect of the present invention, an H-bridge fast control power supply is provided, which includes an energy supply device, and at least two H-bridge output main circuits respectively connected to the output ends of the energy supply device;

[0006] For any of the H-bridge output circuits, a multi-winding phase-shifting transformer and four integrated power devices are included; the primary side of the multi-winding phase-shifting transformer draws power from the energy supply device, and the secondary side has four output terminals to connect the four integrated power devices respectively.

[0007] The positive output terminal of the first integrated power device is connected to the negative output terminal of the second integrated power device to form a power supply branch, and the positive output terminal of the third integrated power device is connected to the negative output terminal of the fourth integrated power device to form another power supply branch.

[0008] The negative output terminal of the first integrated power device is connected to the negative output terminal of the third integrated power device to form the negative output of the two power supply branches, which serves as the negative output end of the H-bridge output circuit; the positive output terminal of the second integrated power device is connected to the positive output terminal of the fourth integrated power device to form the positive output of the two power supply branches, which serves as the positive output end of the H-bridge output circuit;

[0009] The positive and negative output terminals of each H-bridge output circuit are cascaded to supply power to an external load.

[0010] Preferably, in the above-mentioned H-bridge fast-control power supply, each of the integrated power devices includes a current conversion unit and an H-bridge power module, the input end of the current conversion unit is connected to the secondary side of the multi-winding phase-shifting transformer, and the output end is connected to the input of the H-bridge power module; the output of the H-bridge power module constitutes the positive and negative output terminals of the integrated power device.

[0011] Preferably, in the above-mentioned H-bridge fast-control power supply, the outputs of the four integrated power devices in any H-bridge output circuit are phase-shifted one by one under the control of the multi-winding phase-shifting transformer and the phase shift angles between two adjacent integrated power devices are the same.

[0012] Preferably, in the above-mentioned H-bridge fast-control power supply, the phase shift angle is 15°.

[0013] Preferably, in the above-mentioned H-bridge fast-control power supply, the positive output ends of the two power supply branches in any one H-bridge output circuit are respectively connected in series with the same current-sharing reactor.

[0014] Preferably, in the above-mentioned H-bridge fast-control power supply, a filter branch with the same structure is bridged between the output ends of each power supply branch in any H-bridge output circuit, and the filter branch is formed by a capacitor in series with a resistor.

[0015] Preferably, in the above H-bridge fast-control power supply, a three-phase electric control switch is provided between the output end of the energy supply device and each H-bridge output main circuit;

[0016] Each output of the energy supply device supplies energy to the corresponding H-bridge output circuit through the three-phase electric control switch, and each output is configured with a pre-charging branch composed of a capacitor group to implement pre-charging.

[0017] Preferably, in the above-mentioned H-bridge fast-control power supply, the output end of the current conversion unit in each of the integrated power devices is bridged by a capacitor for filtering.

[0018] Preferably, in the above-mentioned H-bridge fast-control power supply, the output end of the current conversion unit in each of the integrated power devices is bridged across the energy discharge circuit to achieve rapid braking.

[0019] Preferably, in the above-mentioned H-bridge fast-control power supply, for any H-bridge output circuit, its four H-bridge power modules adopt a dual closed-loop control method of voltage outer loop and current inner loop, wherein the current inner loop is used for divided current control, and the voltage outer loop is used to control the total voltage of the power supply output.

[0020] According to another aspect of the present invention, there is also provided an electronic device, which includes any one of the above-mentioned H-bridge fast-control power supplies.

[0021] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0022] The H-bridge fast-control power supply and the electronic device using the power supply provided by the present invention configure an H-bridge output main circuit for each of the multiple outputs of the energy supply device, each of which includes a multi-winding phase-shifting transformer and four integrated power devices, wherein every two integrated power devices form a power supply circuit, and the two power supply circuits are cascaded to form the positive and negative output ends of the H-bridge output main circuit; in any H-bridge output main circuit, the outputs of the four integrated power devices are phase-shifted one by one under the control of the multi-winding phase-shifting transformer, and the phase shift angle between two adjacent integrated power devices is the same, so as to realize four-quadrant operation; the positive and negative output ends of each H-bridge output main circuit are cascaded to supply power to an external load, and the operation mode of cascading multiple H-bridge output main circuits is adopted, so that the H-bridge fast-control power supply can meet the high output of the rated voltage of ±1000V and the rated current of ±4kA. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The following is a logic block diagram of an H-bridge fast control power supply provided by an embodiment of the present invention;

[0024] Figure 2 The main circuit electrical topology diagram of the H-bridge fast control power supply provided by the embodiment of the present invention is shown;

[0025] Figure 3 The voltage control principle diagram of the H-bridge fast control power supply provided by the embodiment of the present invention is shown;

[0026] Figure 4 The current control principle diagram of the H-bridge fast control power supply provided by the embodiment of the present invention is shown;

[0027] Figure 5 A global diagram of a triangle wave target current control simulation waveform of an H-bridge fast control power supply provided by an embodiment of the present invention is shown;

[0028] Figure 6 A partial enlarged diagram of a triangle wave target current control simulation waveform of an H-bridge fast control power supply provided by an embodiment of the present invention is shown;

[0029] Figure 7A global diagram of a sine wave target current control simulation waveform of an H-bridge fast control power supply provided by an embodiment of the present invention is shown;

[0030] Figure 8 A partial enlarged diagram of a sine wave target current control simulation waveform of an H-bridge fast control power supply provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain 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 can be combined with each other as long as they do not conflict with each other.

[0032] Figure 1 is a logic block diagram of the H-bridge fast control power supply provided in this embodiment, see Figure 1 , the H-bridge fast-control power supply includes an energy supply device, and at least two H-bridge output main circuits respectively connected to the output ends of the energy supply device;

[0033] The energy supply device in the present invention is a device that can provide electrical energy to the H-bridge output circuit, or convert other natural energy into electrical energy to power the H-bridge output circuit; in a specific example, the energy supply device can be a pulse generator; the power parameters of the pulse generator and the number of H-bridge output circuits mainly depend on the rated voltage and rated current required by the external load. This embodiment does not make specific restrictions. Generally speaking, the power parameters of the pulse generator and the number of H-bridge output circuits increase with the increase of the rated voltage required by the external load.

[0034] For any H-bridge output circuit, it includes a multi-winding phase-shifting transformer and four integrated power devices; the primary side of the multi-winding phase-shifting transformer draws power from the energy supply device, and its secondary side is connected to the four integrated power devices.

[0035] The positive output terminal of the first integrated power device is connected to the negative output terminal of the second integrated power device to form a power supply branch, and the positive output terminal of the third integrated power device is connected to the negative output terminal of the fourth integrated power device to form another power supply branch; the negative output terminal of the first integrated power device is connected to the negative output terminal of the third integrated power device to form the negative output of the two power supply branches, which serves as the negative output end of the H-bridge output circuit; the positive output terminal of the second integrated power device is connected to the positive output terminal of the fourth integrated power device to form the positive output of the two power supply branches, which serves as the positive output end of the H-bridge output circuit;

[0036] In any H-bridge output circuit, the outputs of the four integrated power devices are phase-shifted one by one under the control of a multi-winding phase-shifting transformer, and the phase shift angle between two adjacent integrated power devices is the same, thereby realizing four-quadrant operation. There is no specific restriction on the size of the phase shift angle; the positive and negative output terminals of each H-bridge output circuit are cascaded and used to supply power to an external load.

[0037] In an optional embodiment, each integrated power device includes a converter unit and an H-bridge power module, the input end of the converter unit is connected to the secondary side of the multi-winding phase-shifting transformer, and the output end is connected to the input of the H-bridge power module; the output of the H-bridge power module constitutes the positive and negative output terminals of the integrated power device.

[0038] The following is an example of an H-bridge fast control power supply that can meet the rated voltage of ±1000V and the rated current of ±4kA. Figure 2 This is the main circuit electrical topology diagram of the H-bridge fast control power supply provided in this example, see Figure 2 The H-bridge fast control power supply includes a pulse generator and two H-bridge output main circuits A and B. The power of the pulse generator is 300MVA. It has two identical outputs, and the two outputs supply energy to the two H-bridge output main circuits A and B respectively.

[0039] The H-bridge output circuit A includes a multi-winding phase-shifting transformer T1, four converter units UT1~UT4 and four H-bridge power modules VH1~VH4. The primary side of the multi-winding phase-shifting transformer T1 draws power from one of the outputs of the pulse generator, and its secondary side has four output terminals to respectively connect the four converter units UT1~UT4, and the four H-bridge power modules VH1~VH4 are respectively connected to the output ends of the four converter units UT1~UT4.

[0040] Specifically, the positive output end of the H-bridge power module VH1 is connected to the negative output end of the H-bridge power module VH2 to form a power supply branch, and the positive output end of the H-bridge power module VH3 is connected to the negative output end of the H-bridge power module VH4 to form another power supply branch; the negative output end of the H-bridge power module VH1 is connected to the negative output end of the H-bridge power module VH3 to form the negative output ends of the two power supply branches, which serve as the negative output of the H-bridge output total A; the positive output end of the H-bridge power module VH2 is connected to the positive output end of the H-bridge power module VH4 to form the positive output ends of the two power supply branches, which serve as the positive output of the H-bridge output total A.

[0041] The circuit structure of the H-bridge output circuit B is the same as that of the H-bridge output circuit A, and will not be repeated here. For ease of understanding, in the H-bridge output circuit B, the multi-winding phase-shifting transformer is marked as T2, the four current conversion units are marked as UT5-UT8, and the four H-bridge power modules are VH5-VH8.

[0042] The output ends of the two H-bridge output main circuits A and B are cascaded to form the external output end of the H-bridge fast-control power supply, which is used to supply power to the external load.

[0043] In this example, the phase shift angle between the converter units UT1, UT2, UT3, and UT4 is controlled to be 15° through the multi-winding phase-shifting transformer T1, thereby forming an equivalent 24-pulse power supply, reducing the harmonic content of the distribution system and enhancing the overall electromagnetic compatibility of the system. Similarly, the phase shift angle between the converter units UT5, UT6, UT7, and UT8 is also 15°.

[0044] As a preferred example, the positive output end of each power supply branch is connected in series with a 0.25mH current-sharing reactor to ensure the circuit current-sharing effect, and the control circuit coordinates the control to balance the current of the four power supply branches. Furthermore, in order to remove high-frequency burrs, a high-frequency filter branch with the same structure is connected across the output end of each power supply branch. In an optional example, the high-frequency filter branch is composed of a capacitor in series with a resistor.

[0045] As a preferred example, to achieve power-off control, the two outputs of the pulse generator supply energy to the two H-bridge output mains A and B through the three-phase electric control switches K1 and K2, and each output is equipped with a pre-charging branch C1 and C2 composed of a capacitor group for pre-charging. In addition, the output end of each converter unit is connected across a capacitor for filtering, and an energy discharge circuit composed of an IGBT, a diode, and a resistor is also connected across to achieve rapid braking.

[0046] This embodiment uses a 300MVA pulse generator, and the power tubes in each H-bridge power module are 1700V / 2400A IGBT tubes, which can achieve ±1000V / ±1500A output for each power supply branch. After the four power supply branches are cascaded, the H-bridge fast-control power supply can meet the rated voltage of ±1000V, the rated current of ±4kA, and realize four-quadrant operation.

[0047] The control system block diagram of the H-bridge fast control power supply provided in this embodiment is as follows: Figure 3 , Figure 4 As shown, this embodiment adopts a dual closed-loop control method of a voltage outer loop and a current inner loop. The current inner loop is a divided current control, and the voltage outer loop is used to accurately control the total voltage output by the power supply (because the output is actually a PWM modulated wave, what is actually controlled is the average value of the total voltage).

[0048] Specifically, if Figure 3As shown, when the control target is the voltage output by the H-bridge fast-control power supply, the error between the target value Udc_ref of the total voltage and the feedback value Udc_out of the total voltage after high-frequency filtering is output by a PI (proportional integral) regulator as a unified command value Idc_ref of the inner-loop current. The difference between the actual current sampling feedback value of each power supply branch inside the H-bridge fast-control power supply and the command value Idc_ref is adjusted by the PI regulator to obtain respective modulation wave signals. The modulation wave signal is compared with the triangular carrier to obtain a PWM pulse signal to realize the control of each H-bridge power module.

[0049] like Figure 4 As shown, when the control target is the current output by the H-bridge fast-control power supply, one-fourth of the output current target value Idc* is used as the current control command Idc_ref of each power supply branch inside the power supply. The difference between the actual current sampling feedback value and the command value Idc_ref of each power supply branch is adjusted by the PI regulator to obtain their own modulation wave signals. The modulation wave signal is compared with the triangular carrier to obtain a PWM pulse signal to realize the control of each H-bridge power module.

[0050] Figure 5 , Figure 6 The triangular wave current control simulation waveform provided in this embodiment, the horizontal axis in the figure is the time axis, the unit is seconds, the vertical axis is the current axis (unit is A) or the voltage axis (unit is V), and the current control target is a triangular wave periodic current with a total output current peak-to-peak value of 12kA and a period of 0.1s of the H-bridge fast control power supply.

[0051] Among them, Idc_demand is the total output target current waveform, and i_load is the actual control output current waveform. The control starts from time 0. From the waveform diagram, it can be seen that the time for the actual output current to track the given target current is about 0.009s, that is, the current response time is about 9ms. Id11, id12, id21, and id22 are the output waveforms of the four power supply branches respectively.

[0052] Udc11L and Udc11LU are two randomly selected H-bridge intermediate DC voltages, I(L_PF7L) and I(L_PF7U) are the current waveforms of the upper and lower coils of PF7 (the average current is calculated based on Figure 4 The typical current waveform of the PF7 coil is given, which is formed by the auxiliary power supply control).

[0053] Figure 7 , Figure 8 The figure is a schematic diagram of the sine wave target current control situation. The current control target is a sine wave periodic current with a total output current amplitude of 6kA and a period of 0.1s for the H-bridge fast control power supply. It can be seen from the figure that the output waveforms of the four power supply branches in the H-bridge fast control power supply have good consistency.

[0054] The working parameters of the H-bridge fast control power supply provided in this embodiment are:

[0055] 1) The working mode of the fast control power supply is pulse intermittent, the pulse working time does not exceed 10s, the interval between two pulses is about 10 minutes, it runs for 10 hours a day and 6 months a year;

[0056] 2) The AC input is taken from a 3000V double Y AC pulse generator with a phase shift of 30°;

[0057] 3) Rated voltage is ±1000V, rated current is ±4kA, four-quadrant operation;

[0058] 4) Load impedance value: 7.3479mH, 7.563moh, periodic operation: power on for 10s, interval for 10 minutes.

[0059] The H-bridge fast-control power supply provided in this embodiment can achieve different levels of power output by adjusting the number of H-bridge output total circuits, or the parameters of the pulse generator and the H-bridge power module, so as to provide power for various electronic devices. In a typical application scenario, the H-bridge fast-control power supply provided in this embodiment that meets the rated voltage of ±1000V, the rated current of ±4kA, and realizes four-quadrant operation can be applied to the power supply control of a controlled nuclear fusion tokamak device.

[0060] It will be easily understood by those skilled in the art that the above description is only 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 protection scope of the present invention.

Claims

1. An H-bridge fast control power supply, It is characterized in that It includes an energy supply device and at least two H-bridge output circuits respectively connected to the output ends of the energy supply device; Any of the H-bridge output circuits includes a multi-winding phase-shifting transformer and four integrated power devices; the primary side of the multi-winding phase-shifting transformer draws power from the energy supply device, and the secondary side is connected to the four integrated power devices. The positive output terminal of the first integrated power device is connected to the negative output terminal of the second integrated power device to form a power supply branch, and the positive output terminal of the third integrated power device is connected to the negative output terminal of the fourth integrated power device to form another power supply branch; the negative output terminal of the first integrated power device is connected to the negative output terminal of the third integrated power device to form the negative output of the two power supply branches, which serves as the negative output end of the H-bridge output circuit; the positive output terminal of the second integrated power device is connected to the positive output terminal of the fourth integrated power device to form the positive output of the two power supply branches, which serves as the positive output end of the H-bridge output circuit; In any H-bridge output circuit, the outputs of the four integrated power devices are phase-shifted one by one under the control of the multi-winding phase-shifting transformer, and the phase shift angles between two adjacent integrated power devices are the same; the positive and negative output ends of each H-bridge output circuit are cascaded and used to supply power to the external load; Each of the integrated power devices comprises a current conversion unit and an H-bridge power module, wherein the input end of the current conversion unit is connected to the secondary side of the multi-winding phase-shifting transformer, and the output end is connected to the input of the H-bridge power module; the output of the H-bridge power module constitutes the positive and negative output terminals of the integrated power device; A three-phase electrically controlled switch is provided between the output end of the energy supply device and each H-bridge output main circuit; each output of the energy supply device supplies energy to the corresponding H-bridge output main circuit through the three-phase electrically controlled switch, and each output is configured with a pre-charging branch composed of a capacitor group for pre-charging.

2. The H-bridge fast control power supply as claimed in claim 1, It is characterized in that The phase shift angle is 15°.

3. The H-bridge fast control power supply as claimed in claim 1, It is characterized in that In any H-bridge output circuit, the positive output ends of the two power supply branches are respectively connected in series with current-sharing reactors.

4. The H-bridge fast control power supply as claimed in claim 1, It is characterized in that In any H-bridge output circuit, a filter branch with the same structure is connected across the output ends of the two power supply branches. The filter branch is formed by a capacitor in series with a resistor.

5. The H-bridge fast control power supply as claimed in claim 1, It is characterized in that The output end of the current conversion unit in each of the integrated power devices is connected across a capacitor for filtering.

6. The H-bridge fast control power supply as claimed in claim 5, It is characterized in that The output end of the current conversion unit in each of the integrated power devices is bridged over the energy discharge circuit to achieve rapid braking.

7. The H-bridge fast control power supply as claimed in claim 1, It is characterized in that The four H-bridge power modules in any H-bridge output circuit adopt a dual closed-loop control method of voltage outer loop and current inner loop, wherein the current inner loop is used for current control and the voltage outer loop is used to control the total voltage of the power supply output.

8. An electronic device, It is characterized in that The invention comprises the H-bridge fast control power supply as described in any one of claims 1 to 7.

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