CN112532026A - Magnetic isolation feedback circuit of space power supply - Google Patents
Magnetic isolation feedback circuit of space power supply Download PDFInfo
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- CN112532026A CN112532026A CN202011573671.9A CN202011573671A CN112532026A CN 112532026 A CN112532026 A CN 112532026A CN 202011573671 A CN202011573671 A CN 202011573671A CN 112532026 A CN112532026 A CN 112532026A
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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
- 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
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
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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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a magnetic isolation feedback circuit of a space power supply, which comprises a secondary side error amplification electric appliance EA, a high-frequency small-signal transformer Tc and a controlled drive current source iCMagnetic isolation modulation circuit and sampling switch S formed by the sameHAnd a holding capacitor CHThe formed demodulator and other functional circuits. Converter output voltage VoutAnd error amplifier EA internal reference VREFControl signal V generated after error amplificationEAVia a drive current source i controlled by an external drive signalCPeriodically excited signal transformer TCAfter magnetic coupling transmission, the sampling switch and S of the secondary side of the transformerHAnd a holding capacitor group CHA primary side control signal V is formed after the formed sampling/holding circuit* EAWhich is then compared with a high frequency sawtooth wave inside the PWM comparatorVRAMPThe signals are compared to generate a Pulse Width Modulation (PWM) logic level, and then the PWM is transmitted to a driving pole of a switching device of the main power circuit after the driving capability of the PWM is improved through a gate driving circuit and is used for adjusting the duty ratio D of the switching device, so that the output voltage is adjusted.
Description
Technical Field
The invention belongs to an isolated feedback control mode realization circuit of a power converter, relates to a magnetic isolation feedback circuit of a space power supply, particularly designs a magnetic isolation feedback circuit which is based on a high-frequency signal transformer and an integrated pulse width modulator (PWM IC) UCX845, has low cost, high reliability and excellent performance, and has bright application prospect in the field of space power supplies.
Background
In order to improve the safety and reliability of the spacecraft, the power supply conversion device carried and applied on the spacecraft mostly adopts an isolation type topology, and an isolation type power supply is a well-known difficulty in the field of space power supply design and relates to a relatively complex electromagnetic field theory problem. "isolation" encompasses two aspects: 1) main power circuit isolation; 2) the feedback control circuit is isolated. The main power circuit isolation is mostly realized by adopting topologies such as flyback (actually, energy storage inductor), forward, push-pull, bridge and the like which comprise a power transformer to realize electrical isolation; the feedback control circuit isolation mostly adopts the form of an error amplifier and an optical coupler to achieve the purpose of weak current control and strong current control. However, optical couplers have inherent drawbacks: due to the difference of manufacturing processes, the characteristics of primary side emitting diodes and secondary side phototransistors of different optocoupler devices have larger difference, so that the characteristics of finished products have larger tolerance, the workload of single-machine debugging and testing can be increased, and the batch production of power converters is difficult to realize; secondly, the key parameter CTR (current transfer ratio) of the optical coupler device can fluctuate greatly due to the complex space radiation environment and wide temperature change, and the compensation loop gain fluctuates in a large range, so that the power gain margin and the phase margin are reduced, and the input and load fluctuation resistance robustness is reduced. Therefore, when the optocoupler is applied to a space power supply isolation feedback branch circuit with a complex radiation environment, great potential safety hazards can appear, and therefore the aerospace craft loses reliable power supply guarantee.
In view of the above problems, it is very urgent and necessary to provide an isolated feedback control circuit that has high reliability, can replace an optocoupler, and is suitable for space applications. Similar to the electrical isolation of the main power circuit, the magnetic isolation of the feedback control branch circuit to realize the transmission of the control signal from the secondary side to the primary side is natural, and the magnetic isolation draws more and more attention on the feedback control of the space power supply by the wide working temperature change range, the extremely high linearity and the excellent space radiation environment resistance. The invention designs a magnetic isolation type feedback control circuit based on an integrated PWM pulse width controller UC1845 and a high-frequency signal transformer, and has the function of replacing an optical coupler to control a secondary side error amplification signal in an isolation type feedback control mode.
The electrical isolation can greatly improve the reliability and safety of the space application power conversion device, and the power topology electrical isolation usually realizes the energy conversion process of 'electric energy-magnetic energy-electric energy' through a main power transformer. However, to achieve regulation and control of the output voltage or current, an isolated feedback control loop must be employed. Two common control methods are: primary side control based on optical coupling isolation feedback; and combining secondary side control of the isolated driver. The former disadvantage is that the parameter of the optical coupler ctr (current Transfer ratio) changes greatly with temperature, time, radiation environment and the like, which causes the gain of the feedback control loop to fluctuate greatly, thereby affecting the gain and phase margin of the converter and degrading the robustness of the power converter. The latter disadvantage is that a separate secondary power supply is required, often requiring a dedicated "bootstrap circuit".
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a magnetic isolation feedback circuit of a space power supply.
Technical scheme
A magnetic isolation feedback circuit of a space power supply is characterized by comprising a magnetic isolation modulation circuit and an error amplification circuit, and aiming at the problems, an isolation type feedback control circuit which has high reliability, can replace an optical coupler and is suitable for space application is very urgent and necessary. Similar to the electrical isolation of the main power circuit, the magnetic isolation of the feedback control branch circuit to realize the transmission of the control signal from the secondary side to the primary side is natural, and the magnetic isolation draws more and more attention on the feedback control of the space power supply by the wide working temperature change range, the extremely high linearity and the excellent space radiation environment resistance. The invention designs a magnetic isolation type feedback control circuit based on an integrated PWM pulse width controller UC1845 and a high-frequency signal transformer, which is provided with a substitute optical coupler on an isolation type inverseAnd the function of controlling the error amplification signal of the secondary side is fed. A sample-and-hold circuit and a PWM comparator; the components and the connection relation are as follows: output feedback voltage VOUTR passing through an error amplifying circuitDAAnd RDBThe formed series voltage-dividing resistor network is arranged at the lower arm resistor RDBUpper partial pressure, at R with 2.5V internal reference of TL431FAnd CFError amplification is carried out under the action of the formed compensation network to form a signal VEA(ii) a Signal VEABy RKAAnd CKAAnd a series-connected magnetically isolated modulation circuit diode D1Transmitted to a high-frequency isolation transformer TCThe positive terminal of TL431 through D2、RKAnd CCVConnecting high frequency isolation transformer TCFor TL431, where D2、RKAnd CCVOne end is connected in parallel, and CCVGrounding; the collector of transistor Q1 passes through resistor REIs connected with a power supply VCC, and the base electrode passes through a resistor RB1Connecting the drive carrier signal through a resistor RB2Is connected with a power supply VCC, and an emitter passes through an inductor LMConnecting high frequency isolation transformer TCThe ground terminal of the excitation winding of (1); switch diode D of sampling hold circuitHThe negative end is connected with a high-frequency isolation transformer TCThe positive end output of the excitation winding is connected to CHError signal V of secondary voltage signalEACoupling to CHForm VCH，CHSeries R1BAnd R1AConnect 5V power supply VREF2；VCHBy R1BLoading to the negative input terminal of the EA error amplifier, and connecting the positive terminal with a reference voltage VREF1The output end passes through a diode D and a resistor R1Connected with the inverting terminal of the PWM comparator, the non-inverting terminal of the PWM comparator is a slope and a switching current IsenseProportional sawtooth wave VRAMPThe inverse phase end of the PWM comparator is also provided with a resistor R2And a voltage regulator tube VZParallel circuit and ground.
The high-frequency isolation transformer TCIs chosen to leave margin to prevent it from entering saturation.
The base of the transistor Q1The level is one PN junction diode drop higher than VLM to ensure current iCIs not subject to Q1Static amplification factor hFEThe influence of (c).
The operational amplifier TL431 is required to ensure the minimum supply current, V, of 0.1mAEAThe minimum level amplitude of the voltage signal is 1.24V.
Advantageous effects
The invention provides a magnetic isolation feedback circuit of a space power supply, belonging to the field of an isolation type feedback control mode of a power electronic converter. The invention replaces another isolation feedback control scheme based on primary side control and secondary side control of the optocoupler in the prior art, namely magnetic isolation feedback, and mainly comprises a secondary side error amplification electric appliance EA, a high-frequency small-signal transformer Tc and a controlled drive current source iCMagnetic isolation modulation circuit and sampling switch S formed by the sameHAnd a holding capacitor CHThe formed demodulator and other functional circuits. Converter output voltage VoutAnd error amplifier EA internal reference VREFControl signal V generated after error amplificationEAVia a drive current source i controlled by an external drive signalCPeriodically excited signal transformer TCAfter magnetic coupling transmission, the sampling switch and S of the secondary side of the transformerHAnd a holding capacitor group CHA primary side control signal V is formed after the formed sampling/holding circuit* EAWhich is then compared with a high-frequency sawtooth wave V inside the PWM comparatorRAMPThe signals are compared to generate a Pulse Width Modulation (PWM) logic level, and then the PWM is transmitted to a driving pole of a switching device of the main power circuit after the driving capability of the PWM is improved through a gate driving circuit and is used for adjusting the duty ratio D of the switching device, so that the output voltage is adjusted.
The magnetic isolation feedback control is used for replacing the traditional isolation feedback mode based on the optical coupler, and the defect of gain change of a control loop caused by large fluctuation due to the fact that the current transmission ratio CTR of the body parameter is easily interfered by the external environment in the isolation feedback control of the optical coupler is overcome. In addition, the invention is particularly suitable for being applied to the isolated feedback control occasion of the spacecraft which has harsh ionization total dose radiation environment and rich high-energy particle content and needs power supply conversion.
The invention is mainly characterized in that: the feedback gain has high temperature stability and good linearity; compared with an optical coupling isolation mode, the optical coupling isolation device can endure a severe working environment, and is particularly suitable for the field of space power supplies with severe radiation environments and high requirements on feedback control.
The limitation of the feedback control scheme of the traditional isolation type power converter based on the error amplifier and the optocoupler in the application of the space power supply is avoided: firstly, the temperature stability is poor; the CTR (current transfer ratio) parameter of the optical coupler is variable along with the influence of the severe space irradiation environment; the defects of larger parameter drift, tolerance and the like exist, so that the control effect of better stability and higher robustness can be obtained in the isolation feedback in the application field of the space power supply;
compared with the traditional isolation feedback control scheme based on the optocoupler, the magnetic isolation feedback control based on the signal transformer can achieve better control linearity, stable gain stability under a wide temperature range and smaller parameter drift, so that the robustness of the power converter against input power or output load disturbance is greatly improved. Meanwhile, the defects of power supply reliability reduction, electric energy conversion quality degradation and the like caused by large fluctuation of feedback control loop gain due to CTR parameter change of the optical coupler caused by a complicated space radiation environment can be effectively avoided;
the magnetic isolation feedback control circuit fully utilizes the internal reference of the integrated PWM controller UC1845 and a sawtooth wave signal function circuit, has the advantages of low cost, high linearity, strong environmental disturbance resistance and the like, and is particularly suitable for being popularized and applied in the field of space power supply conversion with complex environment.
The circuit of the embodiment specifically related to the invention is a magnetic isolation feedback circuit with low cost, high reliability and strong robustness based on a current type PWM pulse width modulator UC1845 and an isolation transformer, the UC1845 reference power supply and a sawtooth wave are utilized to generate a driving signal of transformer excitation, the isolation transformer plays a role of a modulator, a peak detection diode forms a demodulation circuit, a secondary side error amplification signal is sent to a primary side PWM controller in a magnetic coupling mode to participate in loop feedback control, and a driving signal of a main power switching tube is generated.
Drawings
FIG. 1: functional block diagram of magnetic isolation feedback parts
FIG. 2: magnetic isolation feedback circuit diagram
FIG. 3: basic working mode of magnetic isolation feedback circuit
FIG. 4: magnetic isolation feedback circuit key working waveform
FIG. 5: magnetic isolation feedback circuit based on PWM controller UC1845
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
magnetic isolation feedback control basic principle:
the magnetic isolation feedback adopts a small-signal high-frequency transformer and a diode or a capacitor as a modulator/demodulator, and an error signal V obtained by operational amplification of a secondary output voltage or current signal and a reference is obtainedEAV is formed by coupling and transmitting to the primary side through a magnetic isolation circuit* EAAnd the signal is sent to a primary side PWM controller to participate in closed loop feedback operation, and a pulse driving signal PWM for controlling the on-off of the main power switch tube is generated. The isolation transformer is excited by an external current source signal in a high frequency mode, and a secondary rectifier diode of the transformer is matched with a capacitor to serve as a simple sampling holding circuit to play a role of a signal demodulator.
The control signal is transmitted by the isolation transformer in an excitation phase or a demagnetization phase, and the isolation transformer can be configured into a forward circuit or a flyback circuit correspondingly. The driving frequency of the exciting current source can be synchronized with the main power circuit topology, but in order to further reduce the size of the isolation transformer, the driving frequency of the exciting current source of the transformer can be correspondingly increased so as to improve the anti-interference capability of the isolation circuit.
FIG. 1 shows a functional block diagram of each part of the magnetic isolation feedback implemented by a flyback transformer, voltage VEARepresentative of the output voltage VoutAnd a reference voltage VREFAn error amplified signal therebetween; small signal transformer TCCurrent source i driven by an external high-frequency carrier signalCAnd (4) periodically exciting.
The basic working process is as follows:
1) when the external driving signal is high, the current source iCConducting, exciting the primary winding of the transformer, and a secondary diode DEAReverse bias is in off state, sampling switch SHIn the off state, the current source iCExciting inductance L on primary sideMAnd equivalent resistance RMDistributing between the two branches;
when the external current source driving signal is low, the exciting current will make the diode DEAPositive bias on, VEAThe signal is reflected to the primary side with a reverse polarity coupling. Sampling switch SHIn synchronism with the modulator, at the transformer TCThe demagnetization phase being open, the capacitor CHHold the sampled voltage V* EAThen with the periodic ramp voltage V of the PWM modulatorRAMPAnd comparing the Pulse Width Modulation (PWM) pulse sequence with the Pulse Width Modulation (PWM) pulse sequence for generating PWM pulse sequence for driving the main switching tube to be controlled to be switched on and switched off.
Analyzing the basic working process of the magnetic isolation feedback circuit:
fig. 2 shows an implementation form of magnetic isolation feedback control on a current mode flyback converter. The voltage regulator TL431 and the peripheral resistor-capacitor component form an error amplifier, and the output voltage VOUTThrough RDA/RDBThe formed series voltage-dividing resistor network is arranged at the lower arm resistor RDBUpper partial pressure, at R with 2.5V internal reference of TL431F/CFError amplification is carried out under participation of the formed compensation network to form a signal VEAIs provided with CKAThe capacitance causes TL431 to achieve a lower output impedance at high frequencies. High-frequency isolation transformer TCAs part of the modulation circuit, comprising a sampling circuit for sampling VEAFlyback winding of signal (diode D)1Windings) and a forward winding (D) for supplying TL431 with power2、CCV、RKThe winding in which it is located). Coupling transformer TCThe excitation winding is composed of a transistor Q1 and a bias current limiting resistor RE/RB1/RB2The simple current source is excited and is controlled by a drive carrier Driver to perform high-frequency switching control, and the drive carrier frequency and the main power topology are openedOff frequency fSWKeep consistent, the period is also TSW(TSW＝1/fSW) With a fixed on-time of TA(as shown in fig. 4). The demodulator is switched on and off by a sampling diode DHCapacitor CHA peak detection circuit for detecting the error signal V of the secondary side voltage signalEAThe coupling is transmitted to the primary side to form V* EAThe signal is compared with a reference voltage VREF1Is fed to primary EA amplifier and is fed to element RFB/CFB1/CFB2Error amplification is carried out under the action of the formed compensation network to generate an error amplification signal V* EASending the signal to the inverting terminal of the PWM comparator, wherein the signal at the inverting terminal of the PWM comparator is a slope and a current sampling signal I of the switching tubesenseProportional sawtooth wave VRAMPAnd comparing to generate PWM driving pulse to carry out on-off control on the main power circuit switching tube.
The basic operation of the magnetically isolated feedback circuit can be divided into three stages as shown in fig. 3: a) the carrier signal is at high level, and the current source is conducted; b) the carrier signal is low, and the current source is turned off; c) and a complete reset phase of the transformer. The basic operating waveforms for the three phases in fig. 3 are shown in fig. 4.
a)[0,TA]Stage, driving carrier signal high level, current source conducting, diode DH/D1Reverse cut-off, D2Forward conducting, transformer TC(1:1:1) Voltage across Primary winding is VLM＝VCV+VF，VCVIs a capacitor CCVVoltage across, VFIs a diode D2A forward pressure drop; primary winding exciting current iLMWith a slope VCC/LMLinearly increasing from 0 to a peak iC PKSecondary side forward winding D2Conducting, flowing current as a capacitor CCVAnd charging to supply power to the operational amplifier TL 431. At the same time, the holding capacitor CHLevel V of* CHWill be charged up to the level V in the previous driving signal periodEAIn the feed stage via branch R1A/R1BDischarging, sending the error amplification signal to PWM controller to participate in closed-loop feedback control。
b)[TA,TS-TD]Stage, drive carrier signal low level, current source is closed, diode D1/DHForward bias on, D2Reverse bias cut-off, voltage across primary winding is VLM＝-(VEA+VF). The voltage polarity of the primary winding is reversed, the current begins to drop, the demagnetization phase is entered, as shown in fig. 4, and finally, the holding capacitor CHWill be charged to reach the level VEA。
[TS-TD,TS]Stage, exciting inductance L in primary winding of transformerMAfter complete demagnetization, the diode DH/D1/D2All enter a reverse bias cut-off state to keep the capacitor CHVia branch R1A/R1BDischarging, then carrying out error amplification on the voltage signal and a reference signal inside the PWM controller to participate in loop feedback.
Magnetic isolation feedback circuit design based on PWM controller UC 1845:
in designing the magnetic isolation circuit feedback control circuit, the following problems should also be noted:
1) the parameter of the isolation transformer Δ B should be selected with enough margin to prevent it from entering a saturation state;
2) the current source control transistor Q should be avoided1Avoid working in saturation state, ensure Q1 base electrode level is higher than VLM one PN junction diode voltage drop, ensure current iCIs not subject to Q1Static amplification factor hFEThe influence of (a);
3) the operational amplifier TL431 is required to ensure the minimum supply current, V, of 0.1mAEAThe minimum level amplitude of the voltage signal is 1.24V;
on the basis of the principle analysis of the magnetic isolation feedback control circuit, an integrated current type PWM controller UC1845 is used as a main controller of the converter and an internal 5.1V reference power supply thereof, a sawtooth wave oscillation circuit generates a driving pulse of a current source, and TL431 is used as an operational amplifier of a secondary side output feedback branch, as shown in fig. 5. The power circuit is a flyback topology with simple circuit structure and high maturity, and the parameters of the basic elements of the designed magnetic isolation feedback flyback converter are shown in the following table:
Claims (4)
1. a magnetic isolation feedback circuit of a space power supply is characterized by comprising a magnetic isolation modulation circuit, an error amplification circuit, a sampling hold circuit and a PWM (pulse width modulation) comparator; the components and the connection relation are as follows: output feedback voltage VOUTR passing through an error amplifying circuitDAAnd RDBThe formed series voltage-dividing resistor network is arranged at the lower arm resistor RDBUpper partial pressure, at R with 2.5V internal reference of TL431FAnd CFError amplification is carried out under the action of the formed compensation network to form a signal VEA(ii) a Signal VEABy RKAAnd CKAAnd a series-connected magnetically isolated modulation circuit diode D1Transmitted to a high-frequency isolation transformer TCThe positive terminal of TL431 through D2、RKAnd CCVConnecting high frequency isolation transformer TCFor TL431, where D2、RKAnd CCVOne end is connected in parallel, and CCVGrounding; the collector of transistor Q1 passes through resistor REIs connected with a power supply VCC, and the base electrode passes through a resistor RB1Connecting the drive carrier signal through a resistor RB2Is connected with a power supply VCC, and an emitter passes through an inductor LMConnecting high frequency isolation transformer TCThe ground terminal of the excitation winding of (1); switch diode D of sampling hold circuitHThe negative end is connected with a high-frequency isolation transformer TCThe positive end output of the excitation winding is connected to CHError signal V of secondary voltage signalEACoupling to CHForm VCH，CHSeries R1BAnd R1AConnect 5V power supply VREF2；VCHBy R1BLoading to the negative input terminal of the EA error amplifier, and connecting the positive terminal with a reference voltage VREF1The output end passes through a diode D and a resistor R1Connected with the inverting terminal of the PWM comparator, the non-inverting terminal of the PWM comparator is a slope and a switching current IsenseProportional sawtooth wave VRAMPThe inverse phase end of the PWM comparator is also provided with a resistor R2And a voltage regulator tube VZParallel circuit and ground.
2. The space power supply magnetic isolation feedback circuit according to claim 1, wherein: the high-frequency isolation transformer TCIs chosen to leave margin to prevent it from entering saturation.
3. The space power supply magnetic isolation feedback circuit according to claim 1, wherein: the base level of the transistor Q1 is higher than the VLM by one PN junction diode drop, and the current i is ensuredCIs not subject to Q1Static amplification factor hFEThe influence of (c).
4. The space power supply magnetic isolation feedback circuit according to claim 1, wherein: the operational amplifier TL431 is required to ensure the minimum supply current, V, of 0.1mAEAThe minimum level amplitude of the voltage signal is 1.24V.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114285250A (en) * | 2021-12-23 | 2022-04-05 | 中国电子科技集团公司第十八研究所 | Magnetic isolation signal feedback device for space power supply control |
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| CN114285250A (en) * | 2021-12-23 | 2022-04-05 | 中国电子科技集团公司第十八研究所 | Magnetic isolation signal feedback device for space power supply control |
| CN114285250B (en) * | 2021-12-23 | 2023-07-18 | 中电科蓝天科技股份有限公司 | Magnetic isolation signal feedback device for space power supply control |
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