CN112448587B - Control circuit based on isolated wide-range high-voltage flexible direct-current combined converter - Google Patents
Control circuit based on isolated wide-range high-voltage flexible direct-current combined converter Download PDFInfo
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- CN112448587B CN112448587B CN202011279277.4A CN202011279277A CN112448587B CN 112448587 B CN112448587 B CN 112448587B CN 202011279277 A CN202011279277 A CN 202011279277A CN 112448587 B CN112448587 B CN 112448587B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a control circuit based on an isolated wide-range high-voltage flexible direct-current combined converter, which comprises an output current sampling circuit, an output voltage sampling circuit, a double closed-loop PI (proportional integral) regulating circuit, a phase-shifting control circuit, a hysteresis comparison circuit, an analog channel data selection circuit and a plurality of driving circuits. The control circuit based on the isolated wide-range high-voltage flexible direct-current combined converter can automatically judge the working state of the isolated wide-range high-voltage flexible direct-current combined converter, and control the converter to flexibly switch between an intra-bridge phase shifting mode and an inter-bridge phase shifting mode, so that the wide-range boosting of the converter is realized.
Description
Technical Field
The invention belongs to the technical field of control of a space Hall electric propulsion power supply system, and particularly relates to a control circuit based on an isolated wide-range high-voltage flexible direct-current combined converter.
Background
The spacecraft electric propulsion system has the advantages of flexible control, accurate positioning, high efficiency, long service life and the like, and has wide application prospects in the fields of orbiting satellites, deep space exploration and the like. The power supply processing unit is the basis for stable and reliable operation of the spacecraft electric propulsion system, and the special characteristic of the ionization load of the spacecraft electric propulsion system requires that the power supply can provide wide-range (300V-1500V) voltage output. In order to ensure the safety and reliability of the electric propulsion system of the spacecraft, an isolation converter which can adapt to an extremely wide voltage gain range and can realize high efficiency in the whole range is required to be adopted for a power supply of the electric propulsion system of the spacecraft. The research on the high-efficiency wide-gain range isolation converter improved on the basis of the full-bridge circuit is quite extensive, but the research on the corresponding control strategy is lagged, and particularly the research on the dual phase-shifting control strategy is almost not carried out.
Disclosure of Invention
In order to realize the wide voltage gain range output of the isolated high-voltage flexible direct-current combined converter and improve the performance of the converter, the invention provides a control circuit based on the isolated wide-range high-voltage flexible direct-current combined converter.
The invention provides a control circuit based on an isolated wide-range high-voltage flexible direct-current combined converter, which comprises:
the input signal of the output voltage sampling circuit is the output voltage Uo of the converter, and the output signal is U' o;
the output current sampling circuit is used for inputting an output current Io of the converter as an input signal and outputting an I' o as an output signal;
the input signals of the double closed-loop PI regulating circuit are the output signal U 'o of the output voltage sampling circuit and the output signal I' o of the output current sampling circuit, and the output control signal is Vctr;
the input end of the phase-shifting control circuit is connected with the output end of the double closed loop PI regulating circuit, and the output end of the phase-shifting control circuit outputs a plurality of square wave signals with fixed duty ratios and adjustable phases;
the input end of the hysteresis comparison circuit is connected with the output end of the double closed loop PI regulating circuit, and the output end of the hysteresis comparison circuit outputs a signal Px;
the input end of the analog channel data selection circuit is connected with the output end of the phase-shifting control circuit and the output end of the hysteresis comparison circuit, and the output end of the analog channel data selection circuit outputs a plurality of square wave signals;
the number of the set driving circuits corresponds to the number of the square wave signals output by the analog channel data selection circuit;
and the input end of each driving circuit inputs a square wave signal output by the analog channel data selection circuit, and the output end of each driving circuit outputs a corresponding driving signal to drive a corresponding switch tube in the isolated wide-range high-voltage flexible direct-current combined converter.
Preferably, the output end of the phase shift control circuit outputs 4 square wave signals, namely OUTA, OUTB, OUTC and OUTD.
Preferably, the output end of the analog channel data selection circuit outputs 8 square wave signals, which are OUT1, OUT2, OUT3, OUT4, OUT5, OUT6, OUT7 and OUT8 respectively.
Preferably, 8 driving circuits are provided, namely, the driving circuit 1, the driving circuit 2, the driving circuit 3, the driving circuit 4, the driving circuit 5, the driving circuit 6, the driving circuit 7 and the driving circuit 8, and corresponding driving signals output are respectively Q1a, Q1b, Q1c, Q1d, Q2a, Q2b, Q2c and Q2d in sequence.
Preferably, the square wave signal output by the phase shift control circuit is pulse width modulation, wherein OUTA and OUTB are complementary, and OUTC and OUTD are complementary;
the initial phase difference of OUTA and OUTC is 0, and the phase difference of OUTA and OUTC becomes larger along with the increase of the input control signal Vctr of the phase-shifting control circuit;
the initial phase difference between OUTB and OUTD is 0, and the phase difference between OUTB and OUTD becomes larger as the input control signal Vctr of the phase shift control circuit increases.
Preferably, the hysteretic comparison circuit has internal references V1 and V2, and V1 > V2;
a control signal Vctr input by the hysteresis comparison circuit: when Vctr is more than V1, Px outputs high level;
a control signal Vctr input by the hysteresis comparison circuit: when Vctr is less than V2, Px outputs low level;
a control signal Vctr input by the hysteresis comparison circuit: when V2 is not less than Vctr is not less than V1, Px keeps the last output state unchanged.
Preferably, the analog channel data selection circuit has an operation mode 1 and an operation mode 2;
in the working mode 1, the output signals OU1 and OU5 of the analog channel data selection circuit are equal to the input signal OUTA thereof, the output signals OU2 and OU6 are equal to the input signal OUTB thereof, the output signals OU3 and OU7 are equal to the input signal OUTC thereof, and the output signals OU4 and OU8 are equal to the input signal OUTD thereof;
in the operation mode 2, the output signals OU1 and OU4 of the analog channel data selection circuit are equal to the input signal OUTA thereof, the output signals OU2 and OU3 are equal to the input signal OUTB thereof, the output signals OU5 and OU8 are equal to the input signal OUTC thereof, and the output signals OU6 and OU7 are equal to the input signal OUTD thereof.
Preferably, when the input signal Px is at a low level, the analog channel data selection circuit is in an operation mode 1, and the output signal of the analog channel data selection circuit enables the converter to operate in an in-bridge phase shift mode through the driving circuit;
when the input signal Px is at a high level, the analog channel data selection circuit is in the working mode 2, and the output signal of the analog channel data selection circuit enables the converter to work in the inter-bridge phase shift mode through the driving circuit.
Compared with the prior art, the control circuit based on the isolated wide-range high-voltage flexible direct-current combined converter can automatically judge the working state of the converter, control the converter to flexibly switch between an intra-bridge phase shifting mode and an inter-bridge phase shifting mode, and realize wide-range boosting of the converter.
Drawings
FIG. 1 is a diagram of a primary side model of an isolated wide-range high-voltage flexible DC combined converter according to the present invention;
FIG. 2 is a diagram of a secondary side model of the isolated wide-range high-voltage flexible DC combined converter according to the present invention;
fig. 3 is a schematic diagram of a control circuit structure based on an isolated wide-range high-voltage flexible dc combined converter according to the present invention;
FIG. 4 is a main waveform diagram of the present invention in the operation mode 1;
fig. 5 is a main waveform diagram in the operation mode 2 of the present invention.
Detailed Description
The present invention will now be described in further detail by way of the detailed description of preferred embodiments thereof, with reference to the accompanying drawings.
The converter of the invention consists of two transformers: the T1 and the T2 are isolated into a primary side and a secondary side, FIG. 1 is a model diagram of the primary side of the isolated wide-range high-voltage flexible direct-current combined converter, and FIG. 2 is a model diagram of the secondary side of the isolated wide-range high-voltage flexible direct-current combined converter. As shown in fig. 1, the primary side is formed by connecting an inverter circuit 1 and an inverter circuit 2 in parallel, wherein the inverter circuit 1 includes MOS transistors S1a, S1b, S1c, and S1d, and the inverter circuit 2 includes MOS transistors S2a, S2b, S2c, and S2 d. As shown in fig. 2, the secondary side is formed by 6 rectifier diodes (Dy1, Dy2, Dy3, Dy4, Dy5, Dy6) and an LC filter (Lo, Co), and Ro is a load of the converter.
Fig. 3 is a schematic structural diagram of a control circuit based on the isolated wide-range high-voltage flexible dc combined converter according to the present invention. As shown in fig. 3, the control circuit of the present invention includes: the circuit comprises an output voltage sampling circuit, an output current sampling circuit, a double closed-loop PI regulating circuit, a phase-shifting control circuit, a hysteresis comparison circuit, an analog channel data selection circuit and a plurality of driving circuits. The input signal of the output voltage sampling circuit is the output voltage Uo and the output signal U' o of the converter. The input signal of the output current sampling circuit is the output current Io and the output signal I' o of the converter. The input end of the double closed loop PI regulating circuit is connected with the output voltage sampling circuit and the output current sampling circuit, and an output signal U 'o of the output voltage sampling circuit and an output signal I' o of the output current sampling circuit are input; and the output control signal of the double closed loop PI regulating circuit is Vctr. And the input end of the phase-shifting control circuit is connected with the output end of the double closed-loop PI regulating circuit, and the phase-shifting control circuit outputs 4 square wave signals OUTA, OUTB, OUTC and OUTD with fixed duty ratio and adjustable phase. And the input end of the hysteresis comparison circuit is connected with the output end of the double closed loop PI regulating circuit, and the output signal of the hysteresis comparison circuit is Px. The input end of the analog channel data selection circuit is connected with the output end of the phase-shift control circuit and the output end of the hysteresis comparison circuit, and the analog channel data selection circuit outputs 8 square wave signals: OUT1, OUT2, OUT3, OUT4, OUT5, OUT6, OUT7, and OUT 8. The number of the driving circuits corresponds to the number of the square wave signals output by the analog channel data selection circuit. In the embodiment of the present invention, the number of the driving circuits is 8, and the driving circuits are respectively: the driving circuit comprises a driving circuit 1, a driving circuit 2, a driving circuit 3, a driving circuit 4, a driving circuit 5, a driving circuit 6, a driving circuit 7 and a driving circuit 8, wherein the input end of each driving circuit is connected with the output end of the analog channel data selection circuit, a square wave signal output by the analog channel data selection circuit is input, and the output end outputs a corresponding driving signal: q1a, Q1b, Q1c, Q1d, Q2a, Q2b, Q2c, Q2d are used for driving corresponding switch tubes in the isolated wide-range high-voltage flexible direct-current combined converter.
The double closed loop PI regulating circuit outputs a control signal Vctr by regulating an output voltage sampling value U 'o and an output current sampling value I' o; the larger the output voltage Uo of the converter is, the larger the control signal Vctr output by the double closed loop PI regulation circuit is.
The PWM signal (pulse width modulation) output by the phase shift control circuit is as follows: OUTA, OUTB, OUTC and OUTD are square wave signals with fixed duty ratio and adjustable phase, wherein OUTA and OUTB are complementary, and OUTC and OUTD are complementary; the initial phase difference between OUTA and OUTC is 0, and the phase difference between OUTA and OUTC becomes larger as the input control signal Vctr increases; the phase difference between OUTB and OUTD is also the same, i.e., the initial phase difference between OUTB and OUTD is 0, and the phase difference between OUTB and OUTD becomes larger as the input control signal Vctr increases.
The hysteretic comparison circuit has two internal references, V1 and V2, where V1 > V2. When the control signal Vctr input by the hysteresis comparison circuit is more than V1, Px outputs high level; when the control signal Vctr input by the hysteresis comparison circuit is less than V2, Px outputs low level; a control signal Vctr input by the hysteresis comparison circuit: when V2 is not less than Vctr not less than V1, Px keeps the last output state unchanged. Flexible switching of the converter between different modes can be achieved by means of the signal Px.
The analog channel data selection circuit has two working modes, namely a working mode 1 and a working mode 2. In the working mode 1, the output signals OU1 and OU5 of the analog channel data selection circuit are equal to the input signal OUTA thereof, the output signals OU2 and OU6 are equal to the input signal OUTB thereof, the output signals OU3 and OU7 are equal to the input signal OUTC thereof, and the output signals OU4 and OU8 are equal to the input signal OUTD thereof; in the operation mode 2, the output signals OU1 and OU4 of the analog channel data selection circuit are equal to the input signal OUTA thereof, the output signals OU2 and OU3 are equal to the input signal OUTB thereof, the output signals OU5 and OU8 are equal to the input signal OUTC thereof, and the output signals OU6 and OU7 are equal to the input signal OUTD thereof.
When the input signal Px is at a low level, the analog channel data selection circuit is in a working mode 1, and the output signal of the analog channel data selection circuit enables the converter to work in an in-bridge phase shift mode through the driving circuit; when the input signal Px is high level, the analog channel data selection circuit is in the operating mode 2, and the output signal of the analog channel data selection circuit enables the converter to operate in the inter-bridge phase shift mode through the driving circuit.
When the converter works in an in-bridge phase shift mode, two inverter circuits on the primary side of the converter respectively work under independent phase shift control, the phase difference between the inverter circuit 1 and the inverter circuit 2 is 180 degrees, namely the waveforms of the primary sides of the transformers T1 and T2 are complementary, so that the secondary sides T1B and T2B of the transformers work in a parallel connection state, at the moment, the rectified high-level voltage is nUin, n is the transformation ratio of the secondary sides and the primary sides of the transformers T1 and T2, and Uin is the input voltage of the converter.
When the converter works in the inter-bridge phase shift mode, the two inverter circuits on the primary side of the converter work in the maximum duty ratio mode, a phase difference exists between the two inverter circuits, the secondary windings T1B and T2B work in series within the range of the phase difference, the other conditions work in parallel, at the moment, the rectified high-level voltage is 2nUin, n is the transformation ratio of the secondary sides and the primary side of the transformers T1 and T2, and Uin is the input voltage of the converter. Under the inter-bridge phase shift mode, the boost ratio of the converter is doubled.
Fig. 4 is a main waveform diagram in the operation mode 1 of the present invention, wherein OUTA, OUTB, OUTC, and OUTD are output waveforms of the phase shift control circuit, T1B and T2B are waveforms of secondary voltages of the transformers T1 and T2, respectively, and a voltage at a point Z is a voltage waveform after the rectifier bridge.
Fig. 5 is a main waveform diagram in the operation mode 2 of the present invention, where OUTA, OUTB, OUTC, and OUTD are output waveforms of the phase shift control circuit, T1B and T2B are secondary voltage waveforms of the transformers T1 and T2, respectively, and the voltage at point Z is a voltage waveform after the rectifier bridge.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (7)
1. A control circuit based on an isolated wide-range high-voltage flexible DC combined converter is characterized by comprising:
the input signal of the output voltage sampling circuit is the output voltage Uo of the converter, and the output signal is U' o;
the output current sampling circuit is used for inputting an output current Io of the converter as an input signal and outputting an I' o as an output signal;
the input signals of the double closed-loop PI regulating circuit are the output signal U 'o of the output voltage sampling circuit and the output signal I' o of the output current sampling circuit, and the output control signal is Vctr;
the input end of the phase-shifting control circuit is connected with the output end of the double closed-loop PI regulating circuit, and the output end of the phase-shifting control circuit outputs a plurality of square wave signals with fixed duty ratios and adjustable phases;
the input end of the hysteresis comparison circuit is connected with the output end of the double closed loop PI regulating circuit, and the output end of the hysteresis comparison circuit outputs a signal Px;
the input end of the analog channel data selection circuit is connected with the output end of the phase-shifting control circuit and the output end of the hysteresis comparison circuit, and the output end of the analog channel data selection circuit outputs a plurality of square wave signals;
the number of the set driving circuits corresponds to the number of the square wave signals output by the analog channel data selection circuit;
each driving circuit has an input end for inputting a square wave signal output by the analog channel data selection circuit, and an output end for outputting a corresponding driving signal for driving a corresponding switch tube in the isolated wide-range high-voltage flexible direct-current combined converter;
wherein the content of the first and second substances,
when the input signal Px is at a low level, the analog channel data selection circuit is in a working mode 1, and the output signal of the analog channel data selection circuit enables the converter to work in a phase shift mode in the bridge through the driving circuit;
when the input signal Px is at a high level, the analog channel data selection circuit is in the working mode 2, and the output signal of the analog channel data selection circuit enables the converter to work in the inter-bridge phase shift mode through the driving circuit.
2. The isolated wide-range high-voltage flexible DC-DC combined converter-based control circuit according to claim 1,
the output end of the phase-shift control circuit outputs 4 square wave signals, namely OUTA, OUTB, OUTC and OUTD.
3. The isolated wide-range high-voltage flexible DC-DC combined converter-based control circuit according to claim 1,
the output end of the analog channel data selection circuit outputs 8 square wave signals, namely OUT1, OUT2, OUT3, OUT4, OUT5, OUT6, OUT7 and OUT 8.
4. The isolated wide-range high-voltage flexible DC-DC combined converter-based control circuit according to claim 1,
the driving circuit 1, the driving circuit 2, the driving circuit 3, the driving circuit 4, the driving circuit 5, the driving circuit 6, the driving circuit 7 and the driving circuit 8 are respectively provided with 8 driving circuits, and corresponding driving signals output are respectively Q1a, Q1b, Q1c, Q1d, Q2a, Q2b, Q2c and Q2d in sequence.
5. The isolated wide-range high-voltage flexible DC-DC combined converter-based control circuit according to claim 1,
the square wave signal output by the phase-shift control circuit is pulse width modulation, wherein OUTA and OUTB are complementary, and OUTC and OUTD are complementary;
the initial phase difference of OUTA and OUTC is 0, and the phase difference of OUTA and OUTC becomes larger along with the increase of the input control signal Vctr of the phase-shifting control circuit;
the initial phase difference between OUTB and OUTD is 0, and the phase difference between OUTB and OUTD becomes larger as the input control signal Vctr of the phase shift control circuit increases.
6. The isolated wide-range high-voltage flexible DC-DC combined converter-based control circuit according to claim 1,
the hysteretic comparison circuit has internal references V1 and V2, and V1 > V2;
a control signal Vctr input by the hysteresis comparison circuit: when Vctr is more than V1, Px outputs high level;
a control signal Vctr input by the hysteresis comparison circuit: when Vctr is less than V2, Px outputs low level;
a control signal Vctr input by the hysteresis comparison circuit: when V2 is not less than Vctr not less than V1, Px keeps the last output state unchanged.
7. The isolated wide-range high-voltage flexible DC-DC combined converter-based control circuit according to claim 1,
the analog channel data selection circuit is provided with a working mode 1 and a working mode 2;
in the working mode 1, the output signals OU1 and OU5 of the analog channel data selection circuit are equal to the input signal OUTA thereof, the output signals OU2 and OU6 are equal to the input signal OUTB thereof, the output signals OU3 and OU7 are equal to the input signal OUTC thereof, and the output signals OU4 and OU8 are equal to the input signal OUTD thereof;
in the operation mode 2, the output signals OU1 and OU4 of the analog channel data selection circuit are equal to the input signal OUTA thereof, the output signals OU2 and OU3 are equal to the input signal OUTB thereof, the output signals OU5 and OU8 are equal to the input signal OUTC thereof, and the output signals OU6 and OU7 are equal to the input signal OUTD thereof.
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| US6016257A (en) * | 1996-12-23 | 2000-01-18 | Philips Electronics North America Corporation | Voltage regulated power supply utilizing phase shift control |
| EP3410593A1 (en) * | 2016-01-29 | 2018-12-05 | Mitsubishi Electric Corporation | Power converter |
| CN110138225A (en) * | 2019-05-23 | 2019-08-16 | 北京理工大学 | Control method for current source type dual transformer bidirectional DC-DC converter |
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| US8711585B2 (en) * | 2012-09-05 | 2014-04-29 | The Florida State University Research Foundation, Inc. | High-frequency-link power-conversion system having direct double-frequency ripple current control and method of use |
| CN104201900A (en) * | 2014-09-18 | 2014-12-10 | 南京航空航天大学 | Resonant converter and method for controlling same |
| CN111030466B (en) * | 2019-12-26 | 2021-08-10 | 南京工程学院 | Wide-voltage isolation type DC-DC converter with automatic current limiting function |
| CN111030467B (en) * | 2019-12-26 | 2021-06-11 | 南京工程学院 | Ultra-wide voltage range isolation type LLC converter |
| CN111509982B (en) * | 2020-03-17 | 2021-04-06 | 合肥工业大学 | Bidirectional power seamless transmission control method for three-phase double-active-bridge converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6016257A (en) * | 1996-12-23 | 2000-01-18 | Philips Electronics North America Corporation | Voltage regulated power supply utilizing phase shift control |
| EP3410593A1 (en) * | 2016-01-29 | 2018-12-05 | Mitsubishi Electric Corporation | Power converter |
| CN110138225A (en) * | 2019-05-23 | 2019-08-16 | 北京理工大学 | Control method for current source type dual transformer bidirectional DC-DC converter |
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