CN114285250B - Magnetic isolation signal feedback device for space power supply control - Google Patents
Magnetic isolation signal feedback device for space power supply control Download PDFInfo
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- CN114285250B CN114285250B CN202111587796.1A CN202111587796A CN114285250B CN 114285250 B CN114285250 B CN 114285250B CN 202111587796 A CN202111587796 A CN 202111587796A CN 114285250 B CN114285250 B CN 114285250B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a magnetic isolation signal feedback device for space power supply control, which belongs to the technical field of space power supplies, wherein a feedback signal generating circuit realizes sampling and signal conversion of output voltage and load current of a secondary side of an isolation power supply, generates characteristic signals reflecting the output voltage and the load current, realizes an auxiliary self-lifting function of the circuit, realizes reference comparison of the output characteristic signals, converts the output characteristic signals into error signals reflecting the output voltage and the load current of a secondary side of an isolation power supply topology, and realizes signal transmission from the characteristic signals of the secondary side to a primary side of an isolation method through a magnetic isolation circuit; the magnetic isolation circuit controls the conduction time and energy storage of the secondary winding of the signal isolation transformer, transmits an error signal to the primary winding end of the signal isolation transformer, and completes signal isolation transmission of the secondary side output voltage and load current characteristics of an isolation power supply; the feedback signal demodulation circuit demodulates the error signal, and the generated error signal is directly proportional to the output voltage and the load current of the isolated power supply.
Description
Technical Field
The invention belongs to the technical field of space power supplies, and particularly relates to a magnetic isolation signal feedback device for space power supply control.
Background
With the continuous development of aerospace industry in China, an energy system of a space vehicle becomes more complex and flexible, such as the current reconfigurable demand of a satellite power supply, space suit, future lunar rover and the like, the demand for the space power supply is more and more varied, particularly the satellite power supply and the like are mostly of non-isolated topological design, and with the multi-bus demand of the space vehicle, such as the inter-power supply of a multi-type bus voltage supply and a multi-platform bus of a space station through an isolated power supply, the demand for the isolated power supply topology among different buses is more and more. The selection of the isolated power supply topology necessarily requires isolated feedback control, the power topology of the current power supply is quite large, the requirements of different powers, different voltages and currents can be met, but the feedback control method mainly comprises high-resistance isolation, optical coupling isolation feedback and magnetic isolation feedback. The space power supply control system is affected by space irradiation, single event effect and space component catalog library, high isolation is not realized in true sense, the optical coupling feedback type isolation is not suitable for the high reliable requirement of space aircrafts due to the unavoidable current transmission ratio attenuation of the devices in space, and the magnetic isolation devices are insensitive to the irradiation and single event effect, so that the space power supply control system has a plurality of advantages. At present, the magnetic isolation feedback method applied to the space power supply surrounds the control circuit of the feedback transformer in an abnormal complex way, the regulation precision is not high, the method also needs the multi-winding feedback transformer to provide an auxiliary source of the secondary side control circuit or needs a special magnetic isolation integrated chip, and especially the traditional magnetic isolation method is only used for voltage loop control, and cannot control a constant current source or constant current constant voltage control, namely the auxiliary source is needed to supply and convert a current sampling signal circuit, so that the current space power supply is not applicable any more to the requirements of high-precision control, low static power consumption, current and voltage multifunctional control and unconventional topology.
In summary, in the magnetic isolation technology applied to the existing space power supply, a special magnetic isolation control chip is needed, the design of the transformer is complex, multiple windings are needed, the existing technology can only feed back the output voltage of the isolated power supply, and the reasons that the devices are complex and do not meet the space device library are needed, so that a plurality of isolated power supply topologies cannot be used due to the isolated feedback.
Disclosure of Invention
The invention provides a magnetic isolation signal feedback device for controlling a space power supply, which gets rid of the defect that the use of an isolated power supply by a space aircraft is trapped in feedback control.
The invention aims to provide a magnetic isolation signal feedback device for space power supply control, which comprises a main power topology module for isolating a power supply and a magnetic isolation feedback topology module; wherein:
the magnetic isolation feedback topology module comprises:
a feedback signal generating circuit for sampling the secondary side output voltage of the isolated power supply and the load current, converting the signals, and generating a reactive output voltageAnd characteristic signal V of current F-IN And V F-RS The auxiliary self-lifting function of the circuit is realized through the TL431 precise reference source, meanwhile, the reference comparison of the output characteristic signals is realized and then converted into an error signal reflecting the output voltage and the load current of the secondary side of the isolated power supply topology, and the signal transmission from the secondary side characteristic signals to the primary side of the isolated method is realized through the magnetic isolation circuit;
the magnetic isolation circuit controls the collector current of the transistor through the pulsation signal, so as to control the conduction time and energy storage of the secondary winding of the signal isolation transformer, and transmits an error signal to the main winding end of the signal isolation transformer, thereby completing the signal isolation transmission of the secondary side output voltage and load current characteristics of the isolation power supply;
and the feedback signal demodulation circuit is used for demodulating the error signal, and the generated error signal is directly proportional to the output voltage and the load current of the isolation power supply.
Preferably, the feedback signal generating circuit is composed of a first controllable precise voltage stabilizing source, a second controllable precise voltage stabilizing source, a third controllable precise voltage stabilizing source, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a fourth capacitor, a fifth capacitor and a sampling resistor; wherein: the anode of the first controllable precise voltage stabilizing source is connected with the anode of the second controllable precise voltage stabilizing source, and the anode of the first controllable precise voltage stabilizing source is connected with the reference electrode of the first controllable precise voltage stabilizing source through an eleventh resistor; the cathode of the first controllable precise voltage stabilizing source is connected with the cathode of the second controllable precise voltage stabilizing source; the cathode of the first controllable precise voltage stabilizing source is grounded through a fifth capacitor, a twelfth resistor and an eleventh resistor in sequence; the reference electrode of the second controllable precise voltage stabilizing source is connected with the anode of the third controllable precise voltage stabilizing source through an eighth resistor, the reference electrode of the second controllable precise voltage stabilizing source is connected with the cathode of the third controllable precise voltage stabilizing source through a seventh resistor, and the cathode of the third controllable precise voltage stabilizing source is connected with the reference electrodes of the sixth resistor and the third controllable precise voltage stabilizing source respectively.
Preferably, the magnetic isolation circuit is composed of a signal isolation transformer, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a transistor, a sixth capacitor and a fourth diode; wherein: the anode of the fourth diode is connected with the emitter of the transistor, the anode of the fourth diode is connected with the base of the transistor through a fourteenth resistor, the cathode of the fourth diode is connected with the base of the transistor, the collector of the transistor is connected with the emitter of the transistor through a sixth capacitor, and the collector of the transistor is connected with the input side of the signal isolation transformer; the emitter of the transistor is connected with the input side of the signal isolation transformer through a thirteenth resistor; and the emitter of the transistor is connected with the cathode of the second controllable precise voltage stabilizing source through a fourth capacitor and a ninth resistor in sequence.
Preferably, the feedback signal demodulation circuit is composed of a fifth resistor, a third capacitor and a third diode.
Preferably, the main power topology module is a flyback power topology circuit.
Preferably, the error signal satisfies the following relationship:
V F-OUT ∝max(V out ＝V F-IN ＝2.495v*(R10+R11)/R11||I L ＝2.495v*R7/(R7+R8)/R S ) (1)；
wherein: v (V) F-OUT Is an error signal; v (V) OUT The secondary side output voltage of the power supply is isolated; v (V) F-IN Is a characteristic signal; i L Is the load current; r10 is a tenth resistor; r11 is an eleventh resistor; r7 is a seventh resistor; r8 is an eighth resistor; rs is the sampling resistor.
Preferably, the transistor is an NPN transistor.
The invention has the advantages and positive effects that:
the invention designs the magnetic isolation feedback topology by utilizing four devices with good on-orbit flight experience and availability, does not need to provide an additional auxiliary source for an isolation functional circuit, has a secondary side constant current and constant voltage double-loop control function, and can also independently use one feedback signal. Constant-voltage control of the existing isolation power supply can also realize constant-current or constant-current constant-voltage control. The concrete implementation is as follows:
1. in the invention, the transformer in the magnetic isolation feedback topology only has one group of windings, a demagnetization winding and an auxiliary source winding are not required to be added, the design is simple, and the volume is small;
2. in the magnetic isolation feedback topology, a secondary side auxiliary source circuit is not required to be added, and the design circuit has the bootstrap function of a power supply while signal feedback is carried out;
3. the magnetic isolation feedback topology has low static power consumption, high response speed and soft start function of the secondary side control primary side;
4. the magnetic isolation feedback topology has few selected devices, has space on-orbit application experience, good availability and is insensitive to space single event effect;
5. the magnetic isolation feedback topology not only can replace the traditional output voltage signal feedback, but also can provide output current (used for constant current control) feedback and constant current and constant voltage feedback;
6. the magnetic isolation feedback topology is suitable for feedback of various isolation topology power supplies, and can be packaged into an integrated unit to be used as a magnetic isolation feedback module;
the controllable precision source TL431 has the advantages of high irradiation resistance and domestic substitution products, low static power consumption of the whole magnetic isolation feedback topology, high response speed, no auxiliary source, and three feedback modes of independent constant current or constant voltage and constant current constant voltage, and can meet the requirement of a spacecraft on the isolation power supply topology.
Drawings
Fig. 1 is a circuit diagram of a preferred embodiment of the present invention.
Detailed Description
For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which: the following examples are illustrative only and not intended to limit the scope of the invention.
In the circuit diagram, the components such as the resistor, the diode and the power tube can be equivalent resistors, diodes and power tube combination networks, but the circuit diagram is the most concise.
As shown in fig. 1, the technical scheme of the invention is as follows:
the magnetic isolation signal feedback device for controlling the space power supply is suitable for occasions where the primary side and the secondary side of the control circuit such as a space vehicle, a satellite power supply and the like are required to be subjected to isolation feedback control, an auxiliary power supply cannot be provided, and the static power consumption is low;
the specific circuit structure comprises: a main power topology module 1 for isolating power supply and a magnetic isolation feedback topology module 2, wherein: the main power topology module 1 takes the flyback power topology commonly used by a satellite power supply as an example, and the main power topology module 1 for isolating the power supply is various in forms in practice; such as full-BRIDGE topologies, half-BRIDGE topologies, and buck+full-BRIDGE converters in use in space, etc.; the following focuses on a magnetic isolation feedback topology 2 of a magnetic isolation signal feedback device for space power control of the present invention.
The magnetic isolation feedback topology module 2 comprises the following three parts of circuits: a feedback signal generating circuit Sub-M1, a magnetic isolation circuit 5, and a feedback signal demodulating circuit 3. Wherein:
the feedback signal generating circuit 4 comprises a first controllable precise voltage stabilizing source U1, a second controllable precise voltage stabilizing source U2, a third controllable precise voltage stabilizing source U3 (TL 431 is selected as the controllable precise voltage stabilizing source), a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a fourth capacitor C4, a fifth capacitor C5 and a sampling resistor Rs, and is used for realizing the output voltage V of the secondary side of the isolation power supply out And load current I L Is converted into a response output voltage characteristic signal V F-IN And a current characteristic signal V F-RS The auxiliary self-lifting function of the circuit is realized through the TL431, meanwhile, the reference comparison of the output characteristic signals is realized, the output characteristic signals are converted into error signals reflecting the output voltage and the load current of the secondary side of the isolated power supply topology, and the signal transmission from the secondary side characteristic signals to the primary side of the isolated device is realized through the magnetic isolation circuit.
The magnetic isolation circuit 5 is composed ofThe number-isolating transformer T2, thirteenth resistor R13, fourteenth resistor R14, fifteenth resistor R15, transistor N1 (preferably NPN transistor), sixth capacitor C6 and fourth diode D4, and the magnetic isolating circuit 5 is connected with the magnetic isolating circuit through pulse signal V F-CTRL The collector current of the transistor N1 is controlled to further control the conduction time and energy storage of the secondary winding of the signal isolation transformer T2, and an error signal can be transmitted to the main winding end of the signal isolation transformer T2 due to the alternating current characteristic, so that the output voltage V is reacted OUT And load current I L Signal isolation transmission of the features; the secondary winding of the signal isolation transformer T2 and the sixth capacitor C6 form a resonant circuit mode in the stage of low PWM, so that the reliability and stability of the feedback circuit are effectively improved; wherein V is F-CTRL The signal can be reasonably selected on the secondary side according to different isolated power supply topologies, and can also be a PWM carrier signal and the like.
The feedback signal demodulation circuit 3 is composed of a fifth resistor R5, a third capacitor C3 and a third diode D3, and is simple in demodulation signal circuit, and mainly realizes demodulation of error signals and generates error signals V F-OUT Output voltage V proportional to isolated power supply out And load current I L 。
Wherein signal V F-OUT The relation is as shown in formula (1).
V F-OUT ∝max(V out ＝V F-IN ＝2.495v*(R10+R11)/R11||I L ＝2.495v*R7/(R7+R8)/R S ) (1)；
The magnetic isolation signal feedback device for space power supply control not only can isolate feedback output voltage V OUT Can also feed back the load current I L If the power supply only needs to feed back the output voltage, the resistor R is sampled S The resistor can be connected to zero; if the constant current source is used for the constant current source power supply, the sampling resistor R is connected S The voltage loop is regulated to the maximum; if the power supply is not only used for constant current control, but also needs to control constant voltage, each value is determined according to the formula (1).
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the invention in any way, but any simple modification, equivalent variation and modification of the above embodiments according to the technical principles of the present invention are within the scope of the technical solutions of the present invention.
Claims (5)
1. The magnetic isolation signal feedback device for space power supply control is characterized by at least comprising a main power topology module for isolating a power supply and a magnetic isolation feedback topology module; wherein:
the magnetic isolation feedback topology module comprises:
a feedback signal generating circuit for sampling the secondary side output voltage of the isolated power supply and the load current, converting the signals, and generating a characteristic signal V reflecting the output voltage and the load current F-IN And V F-RS The auxiliary self-lifting function of the circuit is realized through the TL431 precise reference source, meanwhile, the reference comparison of the output characteristic signals is realized and then converted into an error signal reflecting the output voltage and the load current of the secondary side of the isolated power supply topology, and the signal transmission from the secondary side characteristic signals to the primary side of the isolated method is realized through the magnetic isolation circuit; the feedback signal generating circuit consists of a first controllable precise voltage stabilizing source, a second controllable precise voltage stabilizing source, a third controllable precise voltage stabilizing source, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a fourth capacitor, a fifth capacitor and a sampling resistor; wherein: the anode of the first controllable precise voltage stabilizing source is connected with the anode of the second controllable precise voltage stabilizing source, and the anode of the first controllable precise voltage stabilizing source is connected with the reference electrode of the first controllable precise voltage stabilizing source through an eleventh resistor; the cathode of the first controllable precise voltage stabilizing source is connected with the cathode of the second controllable precise voltage stabilizing source; the cathode of the first controllable precise voltage stabilizing source is grounded through a fifth capacitor, a twelfth resistor and an eleventh resistor in sequence; the reference electrode of the second controllable precise voltage stabilizing source is connected with the anode of the third controllable precise voltage stabilizing source through an eighth resistor, the reference electrode of the second controllable precise voltage stabilizing source is connected with the cathode of the third controllable precise voltage stabilizing source through a seventh resistor, and the cathode of the third controllable precise voltage stabilizing source is respectively connected with the reference electrodes of the sixth resistor and the third controllable precise voltage stabilizing source;
the magnetic isolation circuit controls the collector current of the transistor through the pulsation signal, so as to control the conduction time and energy storage of the secondary winding of the signal isolation transformer, and transmits an error signal to the main winding end of the signal isolation transformer, thereby completing the signal isolation transmission of the secondary side output voltage and load current characteristics of the isolation power supply; the magnetic isolation circuit consists of a signal isolation transformer, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a transistor, a sixth capacitor and a fourth diode; wherein: the anode of the fourth diode is connected with the emitter of the transistor, the anode of the fourth diode is connected with the base of the transistor through a fourteenth resistor, the cathode of the fourth diode is connected with the base of the transistor, the collector of the transistor is connected with the emitter of the transistor through a sixth capacitor, and the collector of the transistor is connected with the input side of the signal isolation transformer; the emitter of the transistor is connected with the input side of the signal isolation transformer through a thirteenth resistor; the emitter of the transistor is connected with the cathode of the second controllable precise voltage stabilizing source through a fourth capacitor and a ninth resistor in sequence;
and the feedback signal demodulation circuit is used for demodulating the error signal, and the generated error signal is directly proportional to the output voltage and the load current of the isolation power supply.
2. The magnetically isolated signal feedback device for space power control of claim 1 wherein the feedback signal demodulation circuit is comprised of a fifth resistor, a third capacitor, and a third diode.
3. A magnetically isolated signal feedback arrangement for space power control as claimed in claim 1 or 2, wherein the main power topology module is a flyback power topology.
4. A magnetically isolated signal feedback device for spatial power control as claimed in claim 3 wherein the error signal satisfies the relationship:
V F-OUT ∝max(V out =V F-IN =2.495v*(R10+R11)/R11 ||I L =2.495v*R7/(R7+R8)/R S )（1）；
wherein: v (V) F-OUT Is an error signal; v (V) OUT The secondary side output voltage of the power supply is isolated; v (V) F-IN Is a characteristic signal; i L Is the load current; r10 is a tenth resistor; r11 is an eleventh resistor; r7 is a seventh resistor; r8 is an eighth resistor; rs is the sampling resistor.
5. A magnetically isolated signal feedback device for space power control as claimed in claim 3 wherein the transistor is an NPN transistor.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5963438A (en) * | 1998-04-13 | 1999-10-05 | Virginia Power Technologies, Inc. | Bi-directional magnetic isolator |
| CN102163922A (en) * | 2011-05-13 | 2011-08-24 | 深圳航天科技创新研究院 | Magnetic isolating feedback circuit containing voltage signal and current signal of switch power supply |
| CN108614610A (en) * | 2018-04-04 | 2018-10-02 | 中国科学院微电子研究所 | Magnetic isolation feedback circuit |
| CN209545444U (en) * | 2019-03-13 | 2019-10-25 | 中国电子科技集团公司第四十三研究所 | A kind of magnetic isolation feedback circuit |
| CN112532026A (en) * | 2020-12-25 | 2021-03-19 | 西北工业大学 | Magnetic isolation feedback circuit of space power supply |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10554144B2 (en) * | 2018-04-05 | 2020-02-04 | Nanyang Technological University | Dual voltage and current loop linearization control and voltage balancing control for solid state transformer |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5963438A (en) * | 1998-04-13 | 1999-10-05 | Virginia Power Technologies, Inc. | Bi-directional magnetic isolator |
| CN102163922A (en) * | 2011-05-13 | 2011-08-24 | 深圳航天科技创新研究院 | Magnetic isolating feedback circuit containing voltage signal and current signal of switch power supply |
| CN108614610A (en) * | 2018-04-04 | 2018-10-02 | 中国科学院微电子研究所 | Magnetic isolation feedback circuit |
| CN209545444U (en) * | 2019-03-13 | 2019-10-25 | 中国电子科技集团公司第四十三研究所 | A kind of magnetic isolation feedback circuit |
| CN112532026A (en) * | 2020-12-25 | 2021-03-19 | 西北工业大学 | Magnetic isolation feedback circuit of space power supply |
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