CN111900895A - Multi-phase pulse power supply and pulse forming method - Google Patents
Multi-phase pulse power supply and pulse forming method Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
- H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
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Abstract
The invention discloses a multi-phase pulse power supply and a pulse forming method, belonging to the technical field of pulse power supplies and comprising a direct current power supply, a pulse forming circuit, a pulse trigger control circuit and a controller; the pulse shaping circuit is not less than two, and each pulse shaping circuit comprises: a main power conversion switch for converting an input power into a power required by a pulse load; the topological inductor is used for storing energy in the power conversion process of the main power conversion switch; the freewheeling diode is used for providing a freewheeling loop for the energy storage inductor when the main power conversion switch is turned off; an auxiliary switch for providing a follow current loop for an inductive part of the pulse load and the energy storage inductor and enabling the load to obtain a pulse edge; the phase difference of output pulses of the pulse shaping circuits is 360 DEG/N; n is the number of pulse shaping circuits. The invention can provide a power supply with ultrahigh current amplitude, low transient response time and low output current ripple, and has the functions of input and output overcurrent protection and multi-path time sequence synchronous phase control.
Description
Technical Field
The invention belongs to the technical field of pulse power supplies, and particularly relates to a multi-phase pulse power supply and a pulse forming method.
Background
As is well known, pulse power sources are widely used in the fields of food processing, medical treatment, ion implantation, engine ignition, and the like. The response speed, output current ripple and repetition frequency of the power supply are directly related to the operating characteristics of the load.
The pulse power supply is a special power supply which accumulates and compresses energy and quickly releases the energy at the moment of triggering, the technical requirements of the pulse power supply are obviously different from the technical requirements of the traditional power supply, the instantaneous output power of the power supply reaches more than 50 times of the power of the traditional power supply, the characteristic index of the output current is very strict, and the application requirement of a load cannot be met by adopting the traditional power supply design scheme.
The existing pulse power supply scheme comprises magnetic pulse compression, a pulse forming network, a Marx generator and the like, aiming at the electricity utilization characteristics of large current, high quality and quick response, the reliable work under the working condition is difficult to realize by a single power device and a single power conversion circuit at present, and the traditional analog circuit control mode is difficult to flexibly and accurately adapt to the online adjustment requirement.
Disclosure of Invention
The invention aims to provide a multiphase pulse power supply and a pulse forming method, can provide a power supply solution with ultrahigh current amplitude, low transient response time and low output current ripple, and has the functions of input and output overcurrent protection, multi-path time sequence synchronous phase control and the like.
The invention provides a multi-phase pulse power supply, which comprises a direct current power supply for supplying power, a pulse forming circuit, a pulse trigger control circuit and a controller; the pulse shaping circuit is not less than two, and each pulse shaping circuit comprises:
a main power conversion switch for converting an input power into a power required by a pulse load;
the topological inductor is used for storing energy in the power conversion process of the main power conversion switch;
the freewheeling diode is used for providing a freewheeling loop for the energy storage inductor when the main power conversion switch is turned off;
an auxiliary switch for providing a follow current loop for an inductive part of the pulse load and the energy storage inductor and enabling the load to obtain a pulse edge;
wherein:
the phase difference of output pulses of the pulse shaping circuits is 360 DEG/N; n is the number of pulse shaping circuits.
Further, at least the following is included: the current and voltage sampling control circuit comprises a current overcurrent protection circuit and a current and voltage sampling control circuit.
Furthermore, the pulse trigger control circuit is a multi-phase synchronous timing trigger control circuit.
Further, the current overcurrent protection circuit includes: the power circuit comprises a Hall sensor for collecting the current value of each power circuit, a comparison module for receiving and comparing the output signal of the Hall sensor, and a feedback module for receiving the output result of the comparison module and controlling the working state of the corresponding power circuit according to the output result.
Furthermore, the pulse shaping circuit is formed by connecting N paths of inductance energy storage type Buck circuits with equal driving phase difference in parallel.
Further, the pulse trigger control circuit comprises a digital signal processor for receiving the control instruction of the pulse current intensity of the controller.
The second objective of the present invention is to provide a pulse forming method based on the above multiphase pulse power supply, wherein the digital signal processor in the pulse trigger control circuit receives the pulse current intensity control command of the controller, implements the control algorithm of the pulse forming unit, and outputs the pulse width modulation control signal.
Further, a proportional-integral control algorithm is adopted in the control process.
Further, the pulse shaping unit control algorithm comprises:
1 st operating phase [ t0-t1 ]: an inductive current rising stage; the power conversion switch is controlled by the instruction of the controller to be switched on, the auxiliary switch is switched off, and the power supply input voltage charges the topology inductor through the main power conversion switch until the inductor current reaches a set value;
phase 2 [ t1-t2 ]: a pulse current output stage; when the inductive current reaches a set value, the main power conversion switch is turned off, the fly-wheel diode is turned on, the inductive current is quickly transferred to the load, the main power conversion switch is controlled to be turned on and off by PWM output by the digital signal processor, and the inductive current is the output current;
3 rd operating phase [ t2-t3 ]: a pulse ending afterflow stage; after the pulse is finished, the main power conversion switch is turned off, the auxiliary switch is turned on, the load current flows through the auxiliary switch and the output isolation diode, and the load current is reduced. The main power conversion switch is turned off, so that energy stored in the topological inductor forms a closed loop through the topological inductor, the auxiliary switch and the freewheeling diode;
and finishing the 3 stages to form a current pulse, and starting the circulation of the next pulse according to the set repeated pulse number until the circulation is finished.
The invention has the advantages and positive effects that:
the power supply system has the advantages that the high-current output is obtained by adopting a parallel combination mode of a plurality of power modules, the pulse phase and the pulse width are adjusted by adopting a digital control mode, the response time of the rising edge and the falling edge of the current is obviously reduced, the accurate frequency and pulse width control effect can be obtained, and the power consumption requirements of high current, high quality and quick response are met.
1. The invention adopts a mode of output by equal-difference phase synthesis of a plurality of power modules, increases the output capability of the power supply and obviously reduces the output current ripple.
2. The invention adopts a digital control mode for adjustment, and can obtain accurate frequency, pulse width and phase modulation effects.
3. The invention adopts the input current overcurrent protection circuit, and is beneficial to the safe and stable work of the power supply under the continuous pulse working condition.
Drawings
FIG. 1 is a schematic diagram of a single-module inductive energy storage Buck pulse shaping circuit in accordance with a preferred embodiment of the present invention;
FIG. 2 is a flow chart of a preferred embodiment of the present invention;
FIG. 3 is a diagram of the first stage circuit operation in a preferred embodiment of the present invention;
FIG. 4 is a circuit diagram of the main power conversion switch operating in an OFF state in a preferred embodiment of the present invention;
FIG. 5 is a circuit diagram of the main power conversion switch operating in the ON state in accordance with the preferred embodiment of the present invention;
FIG. 6 is a diagram of the third stage circuit operation in accordance with the preferred embodiment of the present invention;
FIG. 7 is a diagram of a single pulse trigger control sequence for the pulse shaping circuit in a preferred embodiment of the present invention;
FIG. 8 is a schematic diagram of the output current synthesis of a multi-phase pulse power supply according to a preferred embodiment of the present invention;
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
as shown in fig. 1 to 8, the technical solution of the present invention is:
a multi-phase pulse power supply comprises a direct current power supply for power supply, a pulse forming circuit, a pulse trigger control circuit and a controller; the pulse shaping circuit is not less than two, and each pulse shaping circuit comprises:
a main power conversion switch for converting an input power into a power required by a pulse load;
the topological inductor is used for storing energy in the power conversion process of the main power conversion switch;
the freewheeling diode is used for providing a freewheeling loop for the energy storage inductor when the main power conversion switch is turned off;
an auxiliary switch for providing a follow current loop for an inductive part of the pulse load and the energy storage inductor and enabling the load to obtain a pulse edge;
wherein:
the phase difference of output pulses of the pulse shaping circuits is 360 DEG/N; n is the number of pulse shaping circuits.
Preferably, on the basis of the above preferred embodiment: the circuit also comprises a current overcurrent protection circuit and a current and voltage sampling control circuit.
The pulse trigger control circuit is a multi-phase synchronous timing trigger control circuit.
The current overcurrent protection circuit includes: the power circuit comprises a Hall sensor for collecting the current value of each power circuit, a comparison module for receiving and comparing the output signal of the Hall sensor, and a feedback module for receiving the output result of the comparison module and controlling the working state of the corresponding power circuit according to the output result.
The pulse forming circuit is formed by connecting N paths of inductance energy storage type Buck circuits with equal driving phase difference in parallel.
The pulse trigger control circuit comprises a digital signal processor for receiving a pulse current intensity control instruction of the controller.
In order to achieve the aim, the invention adopts a parallel combination mode of a plurality of power modules to obtain large current output, adopts a digital control mode to adjust pulse phase and pulse width, obviously reduces the response time of the rising edge and the falling edge of the current, can obtain accurate frequency and pulse width control effect, and meets the power consumption requirements of large current, high quality and quick response.
In order to achieve the purpose, the technical scheme adopted by the pulse power supply is a multi-module multi-phase parallel synthesis mode, and each sub-module power current pulse topological structure comprises a current through current protection circuit, a current and voltage sampling control circuit, a pulse forming circuit and a multi-phase synchronous timing sequence trigger control circuit.
The current overcurrent protection adopts a Hall sampling mode to obtain the current value of each power loop, and when the output current of the circuit is greater than a set value, the current overcurrent protection blocks the power tube driving pulse used for current output control by comparing the current value with the set value, so that the aim of overcurrent protection is fulfilled, and the safety of the power circuit and a load is ensured.
The pulse shaping circuit is responsible for generating steep repeated pulses, and the pulse shaping unit is formed by connecting N paths of inductance energy storage type Buck circuits with equal driving phase difference in parallel.
The control of the multiphase synchronous time sequence trigger control circuit is realized by a digital signal processor. And the digital signal processor receives the control instruction of the upper computer, implements a pulse forming control algorithm, generates a control signal of the single-path power tube, and drives the power tube in the Buck circuit to be switched on and off.
As a further improvement of the invention, the current detection circuit can also use a sampling circuit of a sampling resistor plus an instrument amplifier or a sampling circuit of a sampling resistor plus a current mirror.
As shown in fig. 1: sp1 is a main power conversion switch and is responsible for converting input power into power required by a pulse load; lp1 is a topological inductor and is used for storing energy in the power conversion process of the main power conversion switch Sp 1; dp1 is a freewheeling diode, used to provide a freewheeling loop for the energy storage inductor when the main power conversion switch Sp1 is turned off; sp2 is an auxiliary switch for providing a free-wheeling loop for the inductive part of the pulse load and the energy storage inductor, so that the load can obtain a steeper pulse edge.
And a digital signal processor in the pulse trigger control circuit receives a pulse current intensity control instruction of the upper computer, implements a pulse forming unit control algorithm and outputs a Pulse Width Modulation (PWM) control signal. The control process adopts a Proportional Integral (PI) control algorithm commonly used by a closed-loop feedback system, and the rapidity and the steady-state precision of current tracking are ensured. The control flow chart is shown in fig. 2.
Under the control of the trigger control circuit algorithm, the specific working process of the pulse forming circuit has the following three stages:
1 st operating phase [ t0-t1 ]: and an inductive current rising stage. At this stage, under the control of the upper computer command, the main power conversion switch Sp1 is turned on, the auxiliary switch Sp2 is turned off, the power supply input voltage charges the topology inductor Lp1 through the main power conversion switch Sp1 until the inductor current reaches the set value, and the circuit operation state is as shown in fig. 3.
Phase 2 [ t1-t2 ]: and a pulse current output stage. At the time t1, when the inductive current reaches the set value, the main power conversion switch Sp1 is turned off, the freewheeling diode Dp1 is turned on, the inductive current is rapidly transferred to the load, the main power conversion switch Sp1 is turned on and off by PWM control output by the digital signal processor, and the inductive current is the output current. The main power conversion switch Sp1 corresponds to fig. 4 and 5 when operating in the off and on states, respectively.
3 rd operating phase [ t2-t3 ]: the pulse ends the freewheel phase. At time t2, the pulse ends, the main power conversion switch Sp1 turns off, the auxiliary switch Sp2 turns on, the load current flows through the auxiliary switch Sp2 and the output isolation diode Dp2, and the load current rapidly drops. The main power conversion switch Sp1 is turned off, so that the energy stored in the topology inductor Lp1 forms a closed loop through the topology inductor Lp1, the auxiliary switch Sp2 and the freewheeling diode Dp1, as shown in fig. 6.
And finishing the 3 stages to form a current pulse, and starting the circulation of the next pulse according to the set repeated pulse number until the circulation is finished. The single pulse trigger control timing of the pulse shaping circuit is shown in fig. 7.
The pulse power supply is formed by combining N single-module inductance energy storage Buck pulse forming circuits, the phase difference of output pulses of the N pulse forming circuits is 360 degrees/N in figure 8, the pulse amplitude of output current is the sum of the output amplitudes of the N single-circuit pulse forming circuits, and the total ripple is reduced to 1/N of the ripple of the single module.
The multiphase pulse power supply has the beneficial effects that the multiphase pulse power supply is invented, the output capacity of the power supply is improved by using a multi-path and multiphase synthesis mode, and the output current ripple is obviously reduced.
The components such as resistors, diodes and power tubes in the circuit diagram of the invention can also be equivalent resistors, diodes and power tube combination networks.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (9)
1. A multi-phase pulse power supply comprises a direct current power supply for power supply, a pulse forming circuit, a pulse trigger control circuit and a controller; the method is characterized in that: the pulse shaping circuit is not less than two, and each pulse shaping circuit comprises:
a main power conversion switch for converting an input power into a power required by a pulse load;
the topological inductor is used for storing energy in the power conversion process of the main power conversion switch;
the freewheeling diode is used for providing a freewheeling loop for the energy storage inductor when the main power conversion switch is turned off;
an auxiliary switch for providing a follow current loop for an inductive part of the pulse load and the energy storage inductor and enabling the load to obtain a pulse edge; wherein:
the phase difference of output pulses of the pulse shaping circuits is 360 DEG/N; n is the number of pulse shaping circuits.
2. The multiphase pulsed power supply of claim 1, further comprising at least: the current and voltage sampling control circuit comprises a current overcurrent protection circuit and a current and voltage sampling control circuit.
3. The multi-phase pulse power supply of claim 1 or 2, wherein the pulse trigger control circuit is a multi-phase synchronous timing trigger control circuit.
4. The multi-phase pulse power supply of claim 2, wherein the current foldback circuit comprises: the power circuit comprises a Hall sensor for collecting the current value of each power circuit, a comparison module for receiving and comparing the output signal of the Hall sensor, and a feedback module for receiving the output result of the comparison module and controlling the working state of the corresponding power circuit according to the output result.
5. The multiphase pulse power supply of claim 1, wherein said pulse shaping circuit is formed by connecting N inductive energy storage Buck circuits with equal driving phase difference in parallel.
6. The multiphase pulse power supply of claim 1, wherein said pulse trigger control circuit comprises a digital signal processor receiving controller pulse amperage control instructions.
7. A pulse forming method based on a multi-phase pulse power supply of any one of claims 1 to 6, characterized in that a digital signal processor in the pulse trigger control circuit receives a pulse current intensity control command of a controller, implements a pulse forming unit control algorithm, and outputs a pulse width modulation control signal.
8. The pulse shaping method of claim 7, wherein the control process uses a proportional-integral control algorithm.
9. The pulse shaping method of claim 8, wherein the pulse shaping unit control algorithm comprises:
1 st operating phase [ t0-t1 ]: an inductive current rising stage; the power conversion switch is controlled by the instruction of the controller to be switched on, the auxiliary switch is switched off, and the power supply input voltage charges the topology inductor through the main power conversion switch until the inductor current reaches a set value;
phase 2 [ t1-t2 ]: a pulse current output stage; when the inductive current reaches a set value, the main power conversion switch is turned off, the fly-wheel diode is turned on, the inductive current is quickly transferred to the load, the main power conversion switch is controlled to be turned on and off by PWM output by the digital signal processor, and the inductive current is the output current;
3 rd operating phase [ t2-t3 ]: a pulse ending afterflow stage; after the pulse is finished, the main power conversion switch is turned off, the auxiliary switch is turned on, the load current flows through the auxiliary switch and the output isolation diode, and the load current is reduced. The main power conversion switch is turned off, so that energy stored in the topological inductor forms a closed loop through the topological inductor, the auxiliary switch and the freewheeling diode;
and finishing the 3 stages to form a current pulse, and starting the circulation of the next pulse according to the set repeated pulse number until the circulation is finished.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112671234A (en) * | 2020-12-29 | 2021-04-16 | 中国电子科技集团公司第十八研究所 | High-power digital pulse power supply time sequence control system and control method |
| CN112767673A (en) * | 2020-12-29 | 2021-05-07 | 中国电子科技集团公司第十八研究所 | Distributed control system for high-power digital pulse power supply |
| CN113541505A (en) * | 2021-06-04 | 2021-10-22 | 长沙市日业电气有限公司 | Brake power supply for construction elevator and control method |
| CN113923823A (en) * | 2021-01-26 | 2022-01-11 | 上海鸣志自动控制设备有限公司 | Multi-path LED output control circuit based on synchronous out-of-phase control |
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| CN113923823A (en) * | 2021-01-26 | 2022-01-11 | 上海鸣志自动控制设备有限公司 | Multi-path LED output control circuit based on synchronous out-of-phase control |
| CN113541505A (en) * | 2021-06-04 | 2021-10-22 | 长沙市日业电气有限公司 | Brake power supply for construction elevator and control method |
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Address after: 300384 No. 6 Huake No. 7 Road, Binhai New Area, Tianjin Binhai High-tech Industrial Development Zone Patentee after: CETC Blue Sky Technology Co.,Ltd. Address before: 300384 No. 6 Huake No. 7 Road, Binhai New Area, Tianjin Binhai High-tech Industrial Development Zone Patentee before: CETC Energy Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |