CN111077932A - Satellite sailboard power supply array simulator and voltage clamping method thereof - Google Patents
Satellite sailboard power supply array simulator and voltage clamping method thereof Download PDFInfo
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- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
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Abstract
The invention discloses a satellite sailboard power supply array simulator and a voltage clamping method thereof, which belong to the field of program-controlled power supplies, wherein a high-speed wide-range voltage clamping control circuit is adopted, a multistage amplification circuit is formed by an operational amplifier and a triode, an error signal of a current loop is adjusted, and the fast wide-range output voltage clamping control can be realized; the clamping voltage and the voltage reference signal are compared and error-amplified to complete voltage closed-loop control, and the voltage reference signal is controlled by programming to change the output voltage so as to realize programmable control of the clamping voltage.
Description
Technical Field
The invention belongs to the field of program-controlled power supplies, and particularly relates to a satellite sailboard power supply array simulator and a voltage clamping method thereof.
Background
In the aerospace field, most satellite power supplies use a satellite sailboard power supply array of a solar battery as a power core, the performance of the satellite power supplies directly influences the performance and the service life of a satellite system, and the normal operation and the use of the satellite power supplies are greatly influenced. The output state of the satellite sailboard power supply array influences the work of other parts of the satellite system, and meanwhile the work state and the control strategy of the subsequent parts also influence the output of the satellite sailboard power supply array. In the ground research and development and test stage of a satellite power supply system, a light source simulation mode is adopted, and when an actual satellite sailboard power supply array is used for simulating power supply test, the IV output characteristic of the satellite sailboard power supply array is greatly influenced by factors such as environment temperature, sunshine conditions and the like, particularly, an artificial light source is used under severe and complex space working conditions, a temperature range is large, the sunshine conditions are rapidly changed, and high-energy particle radiation is still generated.
The satellite sailboard power supply array simulator is indispensable equipment in an aerospace test system, is used for simulating a direct-current power supply of the output characteristics of a satellite sailboard power supply array, is a program-controlled voltage-controlled current source fundamentally, can simulate a rapidly-changing IV curve output by the satellite sailboard power supply array under various different environmental conditions, can replace an actual satellite sailboard power supply array in a satellite ground test stage, provides simulated power supply of a sailboard battery power supply for equipment such as a satellite or a satellite test system and the like, has the advantages of no time-space limitation, flexible operation mode and the like, and is increasingly widely applied to the aerospace test system.
In order to meet the requirements of rapid curve change and rapid load regulation control, a satellite sailboard power supply array simulator has the characteristics of high-speed wide-range programmable voltage-controlled current, a traditional program-controlled direct-current power supply cannot realize rapid IV curve output, and a rapid wide-range programmable voltage clamping method is required to realize accurate simulation of the output characteristic curve of the satellite sailboard power supply array.
Disclosure of Invention
In order to obtain high-speed wide-range programmable voltage-controlled current characteristics and meet the requirement of a high-precision rapid curve simulation output function of a satellite sailboard power supply array simulator, the invention adopts the satellite sailboard power supply array simulator and a voltage clamping method thereof, adopts a programming control mode, can realize rapid wide-range precise adjustable voltage clamping control, effectively reduces output voltage overshoot under a load rapid switching state, and obviously improves the current dynamic control performance of the satellite sailboard power supply array simulator.
In order to achieve the purpose, the invention adopts the following technical scheme:
a simulator of a satellite sailboard power supply array comprises an analog control unit and a digital processing unit;
the analog control unit is configured to complete signal acquisition and power output control; the power supply comprises a voltage clamping circuit, a power series regulating tube total current limiting circuit, a current control circuit, an output current detection circuit, a voltage control circuit, an output voltage detection circuit and a control operational amplifier circuit;
the voltage clamping circuit is configured for amplifying a programming control voltage reference signal CV _ Prog, comparing the programming control voltage reference signal CV _ Prog with an output voltage AG of the satellite sailboard power supply array simulator and amplifying an error, so that voltage closed-loop control is completed, and clamping voltage control is realized;
a power series regulating tube configured to perform power regulation of the output voltage/current; the power MOSFET is characterized by comprising a plurality of power MOSFETs, and the output current is equally output in parallel in a current equalizing mode;
a total current limit circuit configured to control a maximum operating current of each power MOSFET;
an output current detection circuit configured to differentially amplify a voltage signal into which an output current is converted by a sampling resistor R1, and output a current detection signal;
the current control circuit is configured to amplify the error between the current detection signal and the programming control current reference signal CC _ Prog, so as to control the current output and realize constant current control;
an output voltage detection circuit configured to differentially amplify an output voltage, outputting a voltage detection signal VMON;
the voltage control circuit is configured to perform error amplification on the output voltage detection signal VMON and the programming control voltage reference signal CV _ Prog so as to control voltage output and realize constant voltage control;
the control operational amplifier circuit is configured to convert error signals output by the total current limiting circuit, the current control circuit and the voltage control circuit into a control signal FET _ control for controlling the power series regulating tube;
a digital processing unit configured to implement a programmed value of the output voltage/current and a measurement read-back function of the voltage/current; the device comprises a digital processor, a memory, an ADC module and a DAC module;
a DAC module configured to convert the programmed value of the voltage/current output by the digital processing unit into a reference signal of the voltage/current;
an ADC module configured to convert the sampled voltage/current values into voltage/current measurement values for feeding to a digital processor;
a digital processor configured for processing the voltage/current measurements output by the ADC module;
a memory configured to store signals processed by the digital processor;
the digital processing unit outputs a programming value of voltage/current, generates a reference signal of the voltage/current through the DAC module, performs error amplification with a sampling signal, controls the conduction degree of the power series connection adjusting tube, and completes program control adjustment of the output voltage/current; meanwhile, after sampling and detecting the output voltage/current, the ADC module outputs a voltage/current measurement value which is sent to the digital processor, and the voltage/current measurement read-back function is completed.
Preferably, the voltage clamping circuit comprises a differential amplifier circuit and a multi-stage amplification circuit;
a differential amplifier circuit including an operational amplifier N1 and peripheral devices; the peripheral devices comprise resistors R1-R10, capacitors C1-C4, a diode V3, a triode V1 and a triode V2;
one end of the resistor R1 is connected to the AG end, the other end of the resistor R1, one end of the resistor R2 and one end of the capacitor C1 form a common end which is connected to the negative input end of the operational amplifier N1; the other end of the resistor R2 is connected to the output end; one end of the resistor R3 is connected to the DAC module, and the other end of the resistor R3, one end of the resistor R4, one end of the resistor R5 and the other end of the capacitor C1 form a common end which is connected to the positive input end of the operational amplifier N1; the other end of the resistor R5 is connected to 5V voltage; the other end of the resistor R4 is connected to the emitter of the triode V2; one end of the capacitor C2 and the V-end of the operational amplifier N1 form a common end which is connected to-15 VG, and the other end of the capacitor C2 is connected with an AG end; one end of the capacitor C3 and the V + end of the operational amplifier N1 form a common end which is connected to +15VG, and the other end of the capacitor C3 is connected with an AG end; one end of the resistor R6 is connected to the output end of the operational amplifier N1, and the other end of the resistor R6 and the anode of the diode V3 form a common end which is connected to the emitter of the triode V1; the cathode of the diode V3 and the base of the triode V1 form a common end AG end; one end of the resistor R7 is connected to a voltage source; the other end of the resistor R7 and the base electrode of the triode V2 form a common end which is connected to the collector electrode of the triode V1; one end of the resistor R8 is connected to a voltage source; the other end of the resistor R8 is connected to the collector of the triode V2; the emitter of the triode V2 is connected to the multistage amplifying circuit;
the multi-stage amplifying circuit comprises resistors R9-R17, capacitors C4-C5, a diode V4, a diode V6, a triode V5, a triode N2A and a triode N2B;
one end of the capacitor C4, one end of the resistor R9, one end of the resistor R10, one end of the resistor R11, one end of the resistor R12 and the anode of the diode V4 form a common end which is connected to the emitter of the triode V2; the other end of the resistor R9 and the other end of the capacitor C4 form a common end which is connected to one end of the capacitor C5, and the other end of the capacitor C5 and the other end of the resistor R10 form a common end which is connected to the output end; the other end of the resistor R11 is connected to the base of the triode V5; one end of the resistor R13 is connected to the collector of the triode V5; the emitter of the triode V5 is connected with the output end; the other end of the resistor R12, the cathode of the diode V4 and the other end of the resistor R13 form a common end which is connected to the cathode of the diode V6; the anode of the diode V6 is connected with one end of the resistor R14, the other end of the resistor R14 and one end of the resistor R15 form a common end, and the common end is connected with a common end formed by one end of the resistor R16 and one end of the resistor R17; the other end of the resistor R15 is connected to the emitter of the triode N2A; the base electrode of the triode N2A is connected with the AG end, the collector electrode of the triode N2A is connected with the total current limiting circuit, and the other end of the resistor R16 is connected with the emitting electrode of the N2B; the base electrode of the triode N2B is connected with the AG end, the collector electrode of the triode N2B is connected with the operational amplifier control circuit, and the other end of the resistor R16 is connected with the AG end.
Preferably, the amplifying circuit formed by the transistor V1 is in a common-base form.
Preferably, the capacitor C4, the capacitor C5, the resistor R9 and the resistor R10 form a closed loop for realizing loop compensation and voltage bias of the circuit.
Preferably, the simulator has an IV curve output capability with a maximum open circuit voltage of 170V, a maximum short circuit current of 3.8A, and a maximum power of 596W.
Preferably, the amplification of the differential amplifier is chosen to be 38.2.
Preferably, the V1 is an NPN transistor MMBT6517, the V2 and the V5 are PNP transistors PZTA92, the operational amplifier N1 is LT1001, and the power series adjusting tube is IRFP 260N.
In addition, the invention also provides a voltage clamping method, which adopts the satellite windsurfing board power array simulator and specifically comprises the following steps:
step 1: the reference signal CV _ Prog of the programming control voltage output by the digital processing unit is subjected to signal amplification through a differential amplifier circuit, and is superposed with a fixed bias voltage and converted into a reference voltage for a satellite sailboard power supplyControl voltage V at point A of output voltage negative terminal OUT (namely OUT in figure 1) of array simulatorA；
Step 2: control voltage VAAnd comparing the output voltage AG of the satellite sailboard power supply array simulator with the output voltage AG of the satellite sailboard power supply array simulator by a multistage amplifying circuit, outputting an error signal, amplifying the error signal by a triode N2A and a triode N2B, controlling a control signal FET _ control and a total current limiting signal Lower _ VGC of a power series adjusting tube, further controlling the conduction degree and the total current limiting circuit of the power series adjusting tube, and realizing the rapid voltage clamping.
The invention has the following beneficial technical effects:
1. a fast linear series adjusting circuit is adopted, output current is used as direct controlled quantity, output voltage is used as control quantity, corresponding output current reference is obtained by sampling the output voltage, the conduction degree of a power adjusting tube is adjusted through error amplification and closed-loop control, the output characteristic of a voltage-controlled current source is realized, and finally the power output of an IV curve is completed.
2. A high-speed wide-range voltage clamping control circuit is adopted, a multistage amplification circuit is formed by an operational amplifier and a triode, an error signal of a current loop is adjusted, and the fast wide-range output voltage clamping control can be realized; the clamping voltage and the voltage reference signal are compared and error-amplified to complete voltage closed-loop control, and the voltage reference signal is controlled by programming to change the output clamping voltage so as to realize programmable control of the clamping voltage.
3. A rapid wide-output-range differential amplifier is constructed by an operational amplifier and a triode: the operational amplifier is adopted to drive the high-voltage triodes V1 and V2, so that the output range of the amplifier can be effectively expanded; the amplifying circuit composed of V1 adopts a common base form, which can significantly increase the speed of the amplifier.
4. The programming voltage CV _ Prog is set through programming, the control value of the clamping voltage can be set, and programmable control of the clamping voltage is achieved.
5. And a multistage amplifying circuit is adopted to adjust the loop error, so that the rapid output voltage clamping control can be realized.
6. And the system has good stability by using loop compensation and voltage bias.
Drawings
Fig. 1 is a schematic block diagram of a circuit of a satellite windsurfing board power array simulator.
FIG. 2 is a schematic circuit diagram of a voltage clamping circuit according to the present invention.
Fig. 3 is a graph of the test results.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
example 1:
as shown in fig. 1, a satellite windsurfing board power array simulator comprises an analog control unit and a digital processing unit;
the analog control unit is configured to complete signal acquisition and power output control; the power supply comprises a voltage clamping circuit, a power series regulating tube total current limiting circuit, a current control circuit, an output current detection circuit, a voltage control circuit, an output voltage detection circuit and a control operational amplifier circuit;
the voltage clamping circuit is configured for amplifying a programming control voltage reference signal CV _ Prog, comparing the programming control voltage reference signal CV _ Prog with an output voltage AG of the satellite sailboard power supply array simulator and amplifying an error, so that voltage closed-loop control is completed, and clamping voltage control is realized;
a power series regulating tube configured to perform power regulation of the output voltage/current; the power MOSFET is characterized by comprising a plurality of power MOSFETs, and the output current is equally output in parallel in a current equalizing mode;
a total current limit circuit configured to control a maximum operating current of each power MOSFET;
an output current detection circuit configured to differentially amplify a voltage signal into which an output current is converted by a sampling resistor R1, and output a current detection signal;
the current control circuit is configured to amplify the error between the current detection signal and the programming control current reference signal CC _ Prog, so as to control the current output and realize constant current control;
an output voltage detection circuit configured to differentially amplify an output voltage, outputting a voltage detection signal VMON;
the voltage control circuit is configured to perform error amplification on the output voltage detection signal VMON and the programming control voltage reference signal CV _ Prog so as to control voltage output and realize constant voltage control;
the control operational amplifier circuit is configured to convert error signals output by the total current limiting circuit, the current control circuit and the voltage control circuit into a control signal FET _ control for controlling the power series regulating tube;
a digital processing unit configured to implement a programmed value of the output voltage/current and a measurement read-back function of the voltage/current; the device comprises a digital processor, a memory, an ADC module and a DAC module;
a DAC module configured to convert the programmed value of the voltage/current output by the digital processing unit into a reference signal of the voltage/current;
an ADC module configured to convert the sampled voltage/current values into voltage/current measurement values for feeding to a digital processor;
a digital processor configured for processing the voltage/current measurements output by the ADC module;
a memory configured to store signals processed by the digital processor;
the digital processing unit outputs a programming value of voltage/current, generates a reference signal of the voltage/current through the DAC module, performs error amplification with a sampling signal, controls the conduction degree of the power series connection adjusting tube, and completes program control adjustment of the output voltage/current; meanwhile, after sampling and detecting the output voltage/current, the ADC module outputs a voltage/current measurement value which is sent to the digital processor, and the voltage/current measurement read-back function is completed.
The satellite sailboard power supply array simulator has two working modes: fixed mode and simulation mode. Under the fixed mode, the simulator can provide conventional programme-controlled power function, realizes constant voltage or constant current output function, and its theory of operation is: under the constant voltage state, the voltage control circuit controls the output. The output voltage is differentially amplified by a voltage detection circuit, an output voltage detection signal VMON (voltage detection signals of 0-4.5V correspond to output voltage of 0-full range) and CV _ Prog (voltage detection signals of 0-4.5V correspond to full range set voltage) are subjected to error amplification, and a voltage control circuit controls an FET _ control signal to realize output constant voltage control. In the constant current mode, the output current is converted into a voltage signal through the sampling resistor R1, the voltage signal and the CC _ Prog undergo error amplification through the output current detection circuit, the current output is controlled by the current control circuit, and the constant current control is realized. In order to reduce the current stress of the power series regulating tube, a plurality of power MOSFETs can be utilized, the output current is equally output in parallel in a current equalizing mode, each path of output current is taken as an accurate control object, and the maximum working current of each power MOSFET is controlled through the total current limiting circuit, so that the safe and reliable work of each power MOSFET is guaranteed. The voltage control, the current control and the total current limit are connected through 3 diodes in a common anode mode, a control signal (FET _ control) of the power series adjusting tube is generated through operation, the conduction degree of the power series adjusting tube is controlled, and the output control function of the conventional programmable power supply is achieved.
In the simulation mode, the analog output of the IV curve can be realized, so that the system is required to have the characteristics of a fast wide-range voltage-controlled current source, and the operating principle is as follows: each working point is defined by a voltage/current coordinate pair, and the output curve is determined by a corresponding voltage/current point table, wherein the voltage is used as a table look-up address, and a corresponding current reference value is correspondingly stored in the memory. During working, the output voltage is sampled and used as an index of a storage point table to continuously adjust the constant current loop, so that the rapid power adjustment of the simulation mode is realized. In this mode, to avoid the effect of the voltage loop, the non-inverting input of the voltage control op-amp is terminated with +5V to shield the voltage control path. Because the voltage control is in an open loop state, effective clamping control needs to be carried out on the output voltage so as to reduce the overshoot of the output voltage under the condition of fast load switching, and a special voltage clamping circuit is arranged in the invention.
As can be seen from fig. 2, the differential amplifier circuit, including the operational amplifier N1 and peripheral devices; the peripheral devices comprise resistors R1-R10, capacitors C1-C4, a diode V3, a triode V1 and a triode V2;
one end of the resistor R1 is connected to the AG end, the other end of the resistor R1, one end of the resistor R2 and one end of the capacitor C1 form a common end which is connected to the negative input end of the operational amplifier N1; the other end of the resistor R2 is connected to the output end; one end of the resistor R3 is connected to the XX end, and the other end of the resistor R3, one end of the resistor R4, one end of the resistor R5 and the other end of the capacitor C1 form a common end which is connected to the positive input end of the operational amplifier N1; the other end of the resistor R5 is connected to 5V voltage; the other end of the resistor R4 is connected to the emitter of the triode V2; one end of the capacitor C2 and the V-end of the operational amplifier N1 form a common end which is connected to-15 VG, and the other end of the capacitor C2 is connected with an AG end; one end of the capacitor C3 and the V + end of the operational amplifier N1 form a common end which is connected to +15VG, and the other end of the capacitor C3 is connected with an AG end; one end of the resistor R6 is connected to the output end of the operational amplifier N1, and the other end of the resistor R6 and the anode of the diode V3 form a common end which is connected to the emitter of the triode V1; the cathode of the diode V3 and the base of the triode V1 form a common end AG end; one end of the resistor R7 is connected to a voltage source; the other end of the resistor R7 and the base electrode of the triode V2 form a common end which is connected to the collector electrode of the triode V1; one end of the resistor R8 is connected to a voltage source; the other end of the resistor R8 is connected to the collector of the triode V2; the emitter of the triode V2 is connected to the multistage amplifying circuit;
the operational amplifier N1 is adopted to drive the high-voltage-resistance triodes V1 and V2, so that the output range of the amplifier can be effectively expanded; the amplifying circuit of V1 adopts the common base form, can show the speed that improves the amplifier. Converting the programming voltage CV _ Prog to the control voltage V at point A of the reference OUT-AThus, it is possible to obtain:
wherein 5VR is a 5V reference voltage for setting a fixed offset value, and the offset voltage drop across the channel includes (the BE junction voltage drop of V5 and N2 and the V6 junction voltage drop), thereby setting the control value of the clamping voltage by setting the value of CV _ Prog.
The multi-stage amplifying circuit comprises resistors R9-R17, capacitors C4-C5, a diode V4, a diode V6, a triode V5, a triode N2A and a triode N2B;
one end of the capacitor C4, one end of the resistor R9, one end of the resistor R10, one end of the resistor R11, one end of the resistor R12 and the anode of the diode V4 form a common end which is connected to the emitter of the triode V2; the other end of the resistor R9 and the other end of the capacitor C4 form a common end which is connected to one end of the capacitor C5, and the other end of the capacitor C5 and the other end of the resistor R10 form a common end which is connected to the output end; the other end of the resistor R11 is connected to the base of the triode V5; one end of the resistor R13 is connected to the collector of the triode V5; the emitter of the triode V5 is connected with the output end; the other end of the resistor R12, the cathode of the diode V4 and the other end of the resistor R13 form a common end which is connected to the cathode of the diode V6; the anode of the diode V6 is connected with one end of the resistor R14, the other end of the resistor R14 and one end of the resistor R15 form a common end, and the common end is connected with a common end formed by one end of the resistor R16 and one end of the resistor R17; the other end of the resistor R15 is connected to the emitter of the triode N2A; the base electrode of the triode N2A is connected with the AG end, the collector electrode of the triode N2A is connected with the total current limiting signal Lower _ VGC, and the other end of the resistor R16 is connected with the emitter electrode of the N2B; the base electrode of the triode N2B is connected with the AG end, the collector electrode of the triode N2B is connected with the control signal FET _ control of the power series regulating tube, and the other end of the resistor R16 is connected with the AG end.
When the simulator is under normal current source control, the circuit is in a constant current mode, the actually output voltage value is smaller than the control value of the set clamping voltage, at the moment, the AG potential is Lower than the A potential, namely the voltage at the point B is Lower than the potential at the point A, and V5 is not conducted, so that the N2A and the circuit do not influence FET _ control and Lower _ VGC signals; when the simulator is switched or opened, the circuit exits the constant current mode, and the AG potential is higher than the A potential control voltage VAAnd V5 is turned on, and since the amplification gain of the whole amplification circuit is high, the FETs _ control and Lower _ VGC can be pulled down quickly through V6, N2A and N2B, so that the conduction degree of the power series regulating tube and the total current limiting circuit are controlled, and the voltage is clamped quickly.
Example 2:
on the basis of the above embodiment 1, the present invention further provides a voltage clamping method, which specifically includes the following steps:
step 1: the voltage programming value CV _ Prog output by the digital processing unit is subjected to signal amplification through a differential amplifier circuit, is superposed with a fixed bias voltage and is converted into a point A control voltage V which is referred to the output voltage negative terminal OUT (namely OUT in figure 1) of the satellite sailboard power supply array simulatorA；
Step 2: control voltage VAAnd comparing the output voltage AG of the satellite sailboard power supply array simulator with the output voltage AG of the satellite sailboard power supply array simulator by a multistage amplifying circuit, outputting an error signal, amplifying the error signal by a triode N2A and a triode N2B, controlling a control signal FET _ control and a total current limiting signal Lower _ VGC of a power series adjusting tube, further controlling the conduction degree and the total current limiting circuit of the power series adjusting tube, and realizing the rapid voltage clamping.
The invention requires that the simulator has the IV curve output capacity of the maximum open-circuit voltage 170V, the maximum short-circuit current 3.8A and the maximum power 596W, because the output range of the DAC of the circuit is-5V-0V, the values of the resistors R1-R5 and the selection of the voltage-resistant parameters of the triodes V1, V2 and V5 are related to the range of the maximum open-circuit voltage, in order to ensure the output capacity of the maximum voltage 170V, certain margin is considered, the amplification factor of the differential amplifier is selected to be 38.2, and the values of the resistors are as shown in figure 2; v1 is a high voltage resistant NPN triode MMBT6517 from ONsemii company, and VCEO is 350V; v2 and V5 are high voltage resistant PNP triode PZTA92 from Fairchild company, and VCEO is-300V. In order to offset the 1.8V junction drop (equivalent 3 junction voltages) on the channel and prevent the voltage clamping action in the fixed mode, a control margin of 0.5V is left, so that the fixed offset value is finally designed to be 1.3V. The operational amplifier N1 adopts a high-precision operational amplifier LT1001, and can finish the precise adjustment of the active voltage; the series adjusting tube is made of IRFP260N product of Infineon company, the maximum voltage of a drain electrode and a source electrode is 200V, the maximum conducting current can reach 50A, the maximum conducting resistance is 55m omega, and 14 MOSFETs are adopted to be connected in parallel for reducing the current and the power stress of the device.
The prototype simulates an IV output curve, and the output parameters are set as follows: the short-circuit current Isc is 2.5A, the open-circuit voltage Voc is 100V, the maximum power point current Im is 2.25A, and the maximum power point voltage Vm is 80V. The test was carried out using an AV6595A outdoor photovoltaic module tester with test points at intervals of 62.5 mus and the results are shown in figure 3. As can be seen from fig. 3:
1. the simulator has the advantages that the open-circuit voltage error is 0.42% under the rapid load switching state, the maximum power point voltage error is 0.88%, the rapid output voltage clamping control can be realized, and the control precision is good.
2. The voltage overshoot is avoided in the load fast switching state, and the circuit has good current dynamic control performance.
The invention adopts a fast linear series adjusting circuit to realize the output characteristic of the voltage-controlled current source and complete the power output of the IV curve. The method adopts a rapid, wide-range and programmable voltage clamping method to realize accurate simulation of an output characteristic curve and meet the requirements of rapid curve change and rapid load regulation control.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (8)
1. A satellite sailboard power supply array simulator is characterized in that: comprises an analog control unit and a digital processing unit;
the analog control unit is configured to complete signal acquisition and power output control; the power supply comprises a voltage clamping circuit, a power series regulating tube total current limiting circuit, a current control circuit, an output current detection circuit, a voltage control circuit, an output voltage detection circuit and a control operational amplifier circuit;
the voltage clamping circuit is configured for amplifying a programming control voltage reference signal CV _ Prog, comparing the programming control voltage reference signal CV _ Prog with an output voltage AG of the satellite sailboard power supply array simulator and amplifying an error, so that voltage closed-loop control is completed, and clamping voltage control is realized;
a power series regulating tube configured to perform power regulation of the output voltage/current; the power MOSFET is characterized by comprising a plurality of power MOSFETs, and the output current is equally output in parallel in a current equalizing mode;
a total current limit circuit configured to control a maximum operating current of each power MOSFET;
an output current detection circuit configured to differentially amplify a voltage signal into which an output current is converted by a sampling resistor R1, and output a current detection signal;
the current control circuit is configured to amplify the error between the current detection signal and the programming control current reference signal CC _ Prog, so as to control the current output and realize constant current control;
an output voltage detection circuit configured to differentially amplify an output voltage, outputting a voltage detection signal VMON;
the voltage control circuit is configured to perform error amplification on the output voltage detection signal VMON and the programming control voltage reference signal CV _ Prog so as to control voltage output and realize constant voltage control;
the control operational amplifier circuit is configured to convert error signals output by the total current limiting circuit, the current control circuit and the voltage control circuit into a control signal FET _ control for controlling the power series regulating tube;
a digital processing unit configured to implement a programmed value of the output voltage/current and a measurement read-back function of the voltage/current; the device comprises a digital processor, a memory, an ADC module and a DAC module;
a DAC module configured to convert the programmed value of the voltage/current output by the digital processing unit into a reference signal of the voltage/current;
an ADC module configured to convert the sampled voltage/current values into voltage/current measurement values for feeding to a digital processor;
a digital processor configured for processing the voltage/current measurements output by the ADC module;
a memory configured to store signals processed by the digital processor;
the digital processing unit outputs a programming value of voltage/current, generates a reference signal of the voltage/current through the DAC module, performs error amplification with a sampling signal, controls the conduction degree of the power series connection adjusting tube, and completes program control adjustment of the output voltage/current; meanwhile, after sampling and detecting the output voltage/current, the ADC module outputs a voltage/current measurement value which is sent to the digital processor, and the voltage/current measurement read-back function is completed.
2. The satellite windsurfing board power array simulator of claim 1, wherein: the voltage clamping circuit comprises a differential amplifier circuit and a multi-stage amplification circuit;
a differential amplifier circuit including an operational amplifier N1 and peripheral devices; the peripheral devices comprise resistors R1-R10, capacitors C1-C4, a diode V3, a triode V1 and a triode V2;
one end of the resistor R1 is connected to the AG end, the other end of the resistor R1, one end of the resistor R2 and one end of the capacitor C1 form a common end which is connected to the negative input end of the operational amplifier N1; the other end of the resistor R2 is connected to the output end; one end of the resistor R3 is connected with the DAC module, and the other end of the resistor R3, one end of the resistor R4, one end of the resistor R5 and the other end of the capacitor C1 form a common end which is connected with the positive input end of the operational amplifier N1; the other end of the resistor R5 is connected to 5V voltage; the other end of the resistor R4 is connected to the emitter of the triode V2; one end of the capacitor C2 and the V-end of the operational amplifier N1 form a common end which is connected to-15 VG, and the other end of the capacitor C2 is connected with an AG end; one end of the capacitor C3 and the V + end of the operational amplifier N1 form a common end which is connected to +15VG, and the other end of the capacitor C3 is connected with an AG end; one end of the resistor R6 is connected to the output end of the operational amplifier N1, and the other end of the resistor R6 and the anode of the diode V3 form a common end which is connected to the emitter of the triode V1; the cathode of the diode V3 and the base of the triode V1 form a common end AG end; one end of the resistor R7 is connected to a voltage source; the other end of the resistor R7 and the base electrode of the triode V2 form a common end which is connected to the collector electrode of the triode V1; one end of the resistor R8 is connected to a voltage source; the other end of the resistor R8 is connected to the collector of the triode V2; the emitter of the triode V2 is connected to the multistage amplifying circuit;
the multi-stage amplifying circuit comprises resistors R9-R17, capacitors C4-C5, a diode V4, a diode V6, a triode V5, a triode N2A and a triode N2B;
one end of the capacitor C4, one end of the resistor R9, one end of the resistor R10, one end of the resistor R11, one end of the resistor R12 and the anode of the diode V4 form a common end which is connected to the emitter of the triode V2; the other end of the resistor R9 and the other end of the capacitor C4 form a common end which is connected to one end of the capacitor C5, and the other end of the capacitor C5 and the other end of the resistor R10 form a common end which is connected to the output end; the other end of the resistor R11 is connected to the base of the triode V5; one end of the resistor R13 is connected to the collector of the triode V5; the emitter of the triode V5 is connected with the output end; the other end of the resistor R12, the cathode of the diode V4 and the other end of the resistor R13 form a common end which is connected to the cathode of the diode V6; the anode of the diode V6 is connected with one end of the resistor R14, the other end of the resistor R14 and one end of the resistor R15 form a common end, and the common end is connected with a common end formed by one end of the resistor R16 and one end of the resistor R17; the other end of the resistor R15 is connected to the emitter of the triode N2A; the base electrode of the triode N2A is connected with the AG end, the collector electrode of the triode N2A is connected with the total current limiting circuit, and the other end of the resistor R16 is connected with the emitting electrode of the N2B; the base electrode of the triode N2B is connected with the AG end, the collector electrode of the triode N2B is connected with the operational amplifier control circuit, and the other end of the resistor R16 is connected with the AG end.
3. The satellite windsurfing board power array simulator of claim 2, wherein: the amplifying circuit formed by the triode V1 adopts a common base form.
4. The satellite windsurfing board power array simulator of claim 2, wherein: the capacitor C4, the capacitor C5, the resistor R9 and the resistor R10 form a closed loop, and are used for realizing loop compensation and voltage bias of the circuit.
5. The satellite windsurfing board power array simulator of claim 1, wherein: the simulator has the IV curve output capacity of the maximum open-circuit voltage of 170V, the maximum short-circuit current of 3.8A and the maximum power of 596W.
6. The satellite windsurfing board power array simulator of claim 2, wherein: the amplification of the differential amplifier was chosen to be 38.2.
7. The satellite windsurfing board power array simulator of claim 2, wherein: the V1 selects an NPN triode MMBT6517, the V2 and the V5 select a PNP triode PZTA92, the operational amplifier N1 adopts LT1001, and the power series adjusting tube selects IRFP 260N.
8. A voltage clamping method is characterized in that: the satellite windsurfing board power array simulator adopted according to claim 2, comprising the following steps:
step 1: the programming control voltage reference signal CV _ Prog output by the digital processing unit is subjected to signal amplification through a differential amplifier circuit, is superposed with a fixed bias voltage and is converted into a point A control voltage V which is referred to the output voltage negative terminal OUT-of the satellite sailboard power supply array simulatorA；
Step 2: control voltage VAAnd comparing the output voltage AG of the satellite sailboard power supply array simulator with the output voltage AG of the satellite sailboard power supply array simulator by a multistage amplifying circuit, outputting an error signal, amplifying the error signal by a triode N2A and a triode N2B, controlling a control signal FET _ control and a total current limiting signal Lower _ VGC of a power series adjusting tube, further controlling the conduction degree and the total current limiting circuit of the power series adjusting tube, and realizing the rapid voltage clamping.
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