CN203456934U - Solar photovoltaic system control apparatus - Google Patents
Solar photovoltaic system control apparatus Download PDFInfo
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- CN203456934U CN203456934U CN201320542940.4U CN201320542940U CN203456934U CN 203456934 U CN203456934 U CN 203456934U CN 201320542940 U CN201320542940 U CN 201320542940U CN 203456934 U CN203456934 U CN 203456934U
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses a solar photovoltaic system control apparatus which comprises an AD sampling module for collecting voltages and current, a control loop circuit and drive circuit module, and a DC\DC module. The control loop circuit has three control loops which are respectively adjusted and controlled by three PWM signals sent by an ARM processor, wherein the first path of the PWM signal controls the maximum output power point tracking of the controller, so that the controller works at the maximum power point; the second path of the PWM signal is used for adjusting the controller so that the controller is in a constant-voltage state; and the third path of the PWM signal is used for controlling the charging current of a battery by the controller, so that the battery is in a constant-current charging mode. The seamless alternative operation of the three control loops enables the MPPT (maximum power point tracking) controller to be always in the optimal work state. The solar photovoltaic system control apparatus effectively improves the precision of MPPT and enables such precision to be higher than 99%, is stable and reliable, does not have any erroneous judgement, and obviously reduces failures of the controller.
Description
Technical field
The utility model relates to solar energy photovoltaic system control field, particularly a kind of solar energy photovoltaic system control device that makes full use of.
Background technology
Along with the fast development of global economy, energy demand is increasing, and solar energy more and more gets more and more people's extensive concerning as a kind of inexhaustible, nexhaustible green energy resource.In solar energy photovoltaic system control method, one of most important method is exactly solar energy MPPT(Maximum Power Point Tracking maximal power tracing) control method.At present, adopt in the solar energy photovoltaic system control device of this solar energy MPPT method, only has a solar energy photovoltaic system control device of realizing solar energy MPPT control method, in this solar energy photovoltaic system control device, adopt solar energy MPPT controller, solar energy MPPT controller, by detecting the real-time power output of solar cell, utilizes microprocessor according to pre-determined control program, control solar cell and export maximum power, utilize fully solar energy.
Current, as power supply, solar cell is exported when needs are realized maximum power output, also needs to have other to control output, as constant voltage output and constant current output.
Utility model content
The purpose of this utility model is for above-mentioned defect, and a kind of control device of solar energy photovoltaic system is provided.Make solar cell realize constant voltage output and constant current output.
The technical solution of the utility model is:
A solar energy photovoltaic system control device, this device comprises the DC/DC conversion circuit with switching tube Q1, solar maximum power tracker, PDM keyer;
The direct-flow input end of described DC/DC conversion circuit connects the output of described solar panel, and the DC output end of described DC/DC conversion circuit connects storage battery and load;
The feedback end of described PDM keyer is connected with described solar maximum power tracker, and the pulse-width signal that produces the DC/DC conversion circuit Maximum Power Output described in controlling connects the control end of the switching tube Q1 of described DC/DC conversion circuit;
Also comprise constant voltage tracker and constant current tracker, the feedback end of described PDM keyer respectively with described constant voltage tracker and constant current tracker, produce respectively the control end that the pulse-width signal of controlling described DC/DC conversion circuit output constant voltage or constant current meets the switching tube Q1 of described DC/DC conversion circuit;
Described solar maximum power tracker, constant voltage tracker and constant current tracker asynchronous working.
Further, in above-mentioned solar energy photovoltaic system control device: also comprise sustained diode 2 in described DC/DC conversion circuit, anti-reverse, anti-diode D1, the filter of filling of solar panel, described filter comprises inductance L 1 and filter capacitor C2; Described anti-reverse, the anti-anode that fills diode D1 connects the positive pole of solar panel, and negative electrode connects the drain electrode of described switching tube Q1, and the source electrode of described switching tube Q1 connects one end of described inductance L 1; The other end of described inductance L 1 is by filter capacitor C2 ground connection, and described filter capacitor C2 two ends are the DC output end of described DC/DC conversion circuit; Described sustained diode 2 is connected between the source electrode and ground of described switching tube Q1, the plus earth of described diode D2.
Further, in above-mentioned solar energy photovoltaic system control device: also comprise filter capacitor C1 in described DC/DC conversion circuit, the two ends of described filter capacitor C1 connect respectively between the negative electrode and ground of described diode D1.
Further, in above-mentioned solar energy photovoltaic system control device: described maximal power tracing device comprises maximal power tracing ring, detects the described output voltage of solar panel and the first testing circuit of output current, generates the maximum power reference signal generation module that regulates maximal power tracing reference signal;
Described maximum power reference signal generation module is connected with the output of the first described testing circuit;
Described maximal power tracing ring comprises resistance R 7, resistance R 8, resistance R 1, resistance R 3, resistance R 4, capacitor C 3, amplifier U1B;
The positive pole of described solar panel is by resistance R 7 and resistance R 8 series winding ground connection, and the tie point of resistance R 7 and resistance R 8 connects the in-phase end of described amplifier U1B by resistance R 4;
The maximum power reference signal of described maximum power reference signal generation module output connects the out-phase end of described amplifier U1B by resistance R 3, described resistance R 1 is connected in parallel between the out-phase end and output of amplifier U1B;
The feedback pin of the PDM keyer described in the output termination of amplifier U1B.
Further, in above-mentioned solar energy photovoltaic system control device: described constant voltage tracker comprises the second testing circuit of the voltage of Voltage loop, the output voltage that detects described solar panel and output current, storage battery, the constant voltage reference signal generator module that generation regulates constant voltage reference signal;
The output of the second described testing circuit connects constant voltage reference signal generator module;
Described Voltage loop comprises resistance R 10, resistance R 11, resistance R 12, resistance R 13, resistance R 14, capacitor C 6, capacitor C 7, capacitor C 8, amplifier U2A;
The input of described load is by resistance R 13 and resistance R 14 series winding ground connection, and described capacitor C 8 is in parallel with described resistance R 14, and the tie point of resistance R 13 and resistance R 14 connects the out-phase end of described amplifier U2A by resistance R 12;
The constant voltage reference signal of described constant voltage reference signal generator module output connects the in-phase end of described amplifier U2A by resistance R 11;
The out-phase end that described resistance R 6 and capacitor C 6 series windings are concatenated into described amplifier U2A after can be in parallel with described capacitor C 7 with export between.
Further, in above-mentioned solar energy photovoltaic system control device: described constant current tracker comprises the three testing circuit of the voltage of electric current loop, the output voltage that detects described solar panel and output current, storage battery, the constant current reference signal generation module that generation regulates constant current reference signal;
The output termination constant current reference signal generation module of described three testing circuit;
Described electric current loop comprises resistance R 2, resistance R 5, resistance R 6 and capacitor C 4, capacitor C 5, amplifier U1A;
The analog signal of described load input current connects the out-phase end of described amplifier U1A by resistance R 6;
The constant current reference signal of described constant current reference signal generation module output connects the in-phase end of described amplifier U1A by resistance R 5;
Between being concatenated into the out-phase end of described amplifier U1A after in parallel with described capacitor C 5 after described resistance R 2 and capacitor C 4 series windings and exporting.
In the utility model, in the control device of solar energy photovoltaic system, except maximal power tracing controller, also have constant voltage tracker and constant current tracker; Make this solar energy photovoltaic system more various reliable as power supply.
Below with reference to drawings and Examples, the utility model is described in detail.
Accompanying drawing explanation
Fig. 1 is: total theory diagram of the present utility model.
Fig. 2 is: control ring schematic diagram of the present utility model.
Fig. 3 is: the pattern flow path switch figure of utility model.
Fig. 4 is: ARM control principle drawing of the present utility model.
Fig. 5 is: lower multi-peak photovoltaic curve chart shelters from heat or light in part.
Embodiment
Following content is the further description of the utility model being done in conjunction with concrete preferred implementation, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, all should be considered as belonging to protection range of the present utility model.
In the present embodiment, maximum power reference signal generation module, constant voltage reference signal generator module, constant current reference signal generation module are all intelligent objects, the required signal of signal acquisition that the program that adopts processor utilization to preserve detects according to first, second and third checkout gear.
The present embodiment from hardware mainly comprise arm processor, sample circuit, DC DC circuit, maximal power tracing control loop circuit, constant voltage follow the tracks of control loop circuit, constant current control loop circuit, PWM controller and other circuit.As shown in Figure 1.
Arm processor, the input voltage and input current obtaining according to sampling, output voltage electric current, ambient temperature and according to the output characteristic curve of solar panel, regulate each functional module, realizes sun-generated electric power.
Sample circuit, is used for the signals such as input voltage and input current, output voltage electric current and temperature to be transformed into the analog signal that arm processor can be accepted sampling.
DC DC circuit, by metal-oxide-semiconductor, rectifier diode, inductance, the anti-reverse diode of cell panel and filter capacitor, formed sampling BUCK topological structure.Control loop is by the PWM ripple duty ratio that regulates PWM controller to produce, control the ON time of switching tube in DC-DC circuit, just can control output voltage, change the equivalent load of solar panel, thereby realized MPPT maximum power point tracking, constant voltage output, constant current output of solar cell etc.
PWM controller, is comprised of pulse width modulating chip, drive circuit, produces the PWM ripple of corresponding duty ratio according to the feedback signal of control ring output.
Control loop circuit is also part most crucial in the utility model, it has three control rings as shown in Figure 2, be respectively MPPT ring, Voltage loop and electric current loop, three reference signals (VS_MPPT, VS_I, the VS_V) regulation and control all being sent by arm processor, arm processor carrys out the operating state of conditioning controller according to input voltage and input current, output voltage electric current and the load battery change situation of sampling.MPPT ring is used for controlling the peak power output tracking of MPPT controller, allows controller can effectively be operated in maximum power point, in MPPT pattern.Voltage loop is used for conditioning controller makes it in constant voltage mode.Electric current loop is used for the charging current of conditioning controller to cell load, makes it in constant current charging mode.Three control ring output signals are finally connected to the feedback pin of pwm chip jointly, control the conversion of DC-DC, make the seamless conversion work replacing of whole MPPT controller, allow MPPT controller all the time in intelligent optimum operating state.
Concrete control procedure is as follows:
The voltage of A, the output voltage that detects solar panel and electric current, detection storage battery, is changed and is entered into processor A RM by AD, below in ARM, processes;
B, judge whether the power output of solar cell is greater than the minimum power of setting, if negate, enter standby mode, otherwise turn to step C; Now have two kinds of situations, when a kind of situation is evening, solar panel has output voltage, another situation refers to that sunlight is more weak, there is no the value of utilization, and now power output is very little, a general minimum power points of setting, when being less than this power, enters holding state.
C, judge whether battery capacity is full of, if be not full of, turn to step D, otherwise turn to step e;
D, control solar cell adopt maximal power tracing mode to export, and turn to steps A;
E, control solar cell adopt constant voltage mode to export;
When if the output current of F solar cell is greater than the current-limiting points of setting, control solar cell and adopt current constant mode output, turn to steps A.
As Fig. 1 entire block diagram that is controller of the present utility model, solar panel export to charge in batteries and other load supplyings, DC/DC conversion circuit (DC-DC change-over circuit) adopts step-down (Buck) circuit, is connected between input source and load.In the specific implementation of circuit, the AD sampling module of arm processor detects the analog signals such as voltage, electric current and battery tension of controller input, judge the state of current system, export three road pwm signals, by RC filter circuit, convert the benchmark of MPPT ring, Voltage loop and electric current loop to, by three tunnel loop adjustment, control, loop output signal is incorporated into the feedback pin of pwm chip, reach the conversion of controlling DC-DC, realize the power supply to the charging of storage battery and load.The variation of regulation output voltage, has just changed the equivalent load of solar panel, thereby realizes MPPT maximum power point tracking, constant voltage source, the constant-current supply of solar cell.
If Fig. 2 is control ring schematic diagram of the present utility model, the reference signal of electric current loop, Voltage loop and MPPT ring is respectively VS_I, VS_V and VS_MPPT, and feedback voltage signal is respectively controller output current amplified signal (BAT_I), output voltage signal (OUT+) and input voltage signal (PV+).Arbitrary moment, in three rings, only has a wherein ring job, the output signal of three rings is passed through D3, D4, it (is pwm chip that D5 is connected to pulse width modulating chip, a kind of control IC that the Switching Power Supply of main flow all adopts at present, in the situation that control circuit output frequency is constant, input voltage size by its feedback pin access is adjusted its output duty cycle, thereby reach the object of regulated output voltage) feedback pin, feedback pin connects outward and draws VCC, when any one ring work time, its loop output will drag down feedback pin, make to feed back pin change in voltage, thereby make pwm chip adjust its output PWM ripple duty ratio.Idle loop, amplifier is output as high level signal, approaches amplifier operating voltage, to feedback pin voltage, changes inoperative.
MPPT ring is open loop control, by resistance R 7, R8, R1, R3, R4, capacitor C 3, amplifier U1B forms, PV+ is the input voltage signal of controller, it is the output voltage of solar panel, by R7 and R8 dividing potential drop, after dividing potential drop, signal is as the feedback signal of amplifier in-phase end, the error signal of amplifier output is sent to pwm chip, pwm chip picks up this error voltage signal, be converted into suitable duty ratio and remove control switch pipe Q1, the variation of regulation output voltage, changed the equivalent load of cell panel, thereby realize the variation that changes controller input voltage.When controller is operated in MPPT pattern, in three rings, only have MPPT ring to play regulatory role, voltage changes with electric current loop and does not work, the regular adjusting of arm processor VS_MPPT reference signal, input voltage that just can conditioning controller changes in gamut, and input current is also along with variation, arm processor calculates each adjusting in real time change after the input power value (being the power output of solar panel) of controller, by software, process, thereby find out power maximum point.
Voltage loop is closed-loop control, can respond fast the dynamic change of output voltage, by resistance R 10, R11, R12, R13, R14, capacitor C 6, C7, C8, amplifier U2A, formed, OUT+ is the output voltage signal of controller, by R13 and R14 dividing potential drop as feedback signal, this feedback voltage is sent into the end of oppisite phase of error amplifier, makes it to produce VS_V reference signal with arm processor and compares and produce an error voltage signal.Pwm chip picks up this error voltage signal, be converted into suitable duty ratio and remove control switch pipe Q1, thereby by output voltage stabilization the magnitude of voltage a setting.When Voltage loop is not worked, the output voltage signal of error amplifier approaches the operating voltage of amplifier, so inoperative to loop.
Electric current loop is closed-loop control, can respond fast the variation of output current, the cut-off current that constant output current is being set.By resistance R 2, R5, R6, capacitor C 4, C5, amplifier U1A, formed, BAT_I is the signal after controller output current amplifies, end of oppisite phase by R6 resistance feedback to error amplifier, makes it to produce VS_I reference signal with arm processor and compares and produce an error voltage signal.Pwm chip picks up this error voltage signal, be converted into suitable duty ratio and remove control switch pipe Q1, thereby by constant output current the Current Limits flow valuve a setting.When electric current loop is not worked, the output voltage signal of error amplifier approaches the operating voltage of amplifier, so inoperative to loop.
The mutual alternation of three rings, control strategy is: controller detects its output voltage, output current, if output voltage detected lower than the electrical voltage point lower limit of setting, also underfill and can not to meet load normal of the battery capacity that connects, now, MPPT ring works, the linear VS_MPPT signal that changes of arm processor, MPPT encircles work, enters MPPT pattern, realize the MPPT maximum power point tracking of solar cell, as early as possible battery be full of and work to load.If controller output voltage reach the magnitude of voltage of setting and output current lower than set threshold value time, think that battery is full of, load also can work, and closes VS_MPPT signal, carries out Voltage loop, will enter constant voltage mode.Change Voltage loop reference signal VS_V, controller output voltage is corresponding change also; Can fixed reference signal, make controller be fixed on a stable output voltage, if when controller output current surpasses the current-limiting points of setting, MPPT ring and Voltage loop are closed, electric current loop works automatically, enters constant current mode.If change electric current loop reference signal VS_I, can corresponding change controller output current limiting electric current.If solar panel input voltage is low and power output is inadequate, or without sunlight, arm processor is controlled three rings and is not all worked, and MPPT controller enters standby mode.
If Fig. 3 is pattern flow path switch figure of the present utility model.Specifically describe as follows:
1), after controller powers on, whether the first-selected power output that detects solar cell is greater than minimum threshold.Now, whether input voltage and input power that the AD detection module of arm processor detects controller are greater than minimum threshold, if do not satisfied condition, controller enters standby mode.If meet, jump to (2);
2) the AD detection module of controller judges its output voltage again, if controller output voltage reach the magnitude of voltage of setting and output current lower than set threshold value time, battery is full of, load also can work, and carries out Voltage loop, will enter constant voltage mode.Otherwise jump to (3);
3) if output voltage detected lower than the electrical voltage point lower limit of setting, also underfill and can not to meet load normal of the battery capacity that connects, MPPT encircles work, enters MPPT pattern, realizes the MPPT maximum power point tracking of solar cell.
4) in carrying out (2) (3) process, if when controller output current surpasses the current-limiting points of setting, MPPT ring and Voltage loop are closed, and electric current loop works automatically, enters constant current mode.Otherwise jump to (1), start again circulation.
The intelligent parts of the utility model embodiment is ARM, as shown in Figure 4, whole Intelligent control electric route arm processor, resistance R 9, R15, R16, R17, R18, R19, R20, R21, capacitor C 9, C10, C18, C19, C20, C21 and other circuit form, and arm processor is ST Microelectronics
cortex
tMthe STM32F103 processor of-M3 core.The highest 72MHz of CPU work dominant frequency, can have multi-channel PWM output, and output frequency is when 17Khz, and duty cycle resolution can reach 12.STM32F103 processor 14 pin position Sun_In_V are solar panel voltage sense signal, 15 pin position Sun_In_I are solar panel output electric current measure signal, 16 pin position Out_V are controller for solar voltage sense signal, 17 pin position Out_I are controller for solar output electric current measure signal, 11 pin position Temp_Detect are that ambient temperature detection signal ，Zhe five tunnels are all sent to the inner high accurate A/D sampling module of processor.The PWM module of STM32F103 processor inside produces three road PWM, is respectively PWM1, PWM2 and PWM3.PWM1 signal is MPPT ring PWM, and the RC low pass filter that process R16, R19 and capacitor C 18, C19 form, is adjusted to the reference signal VS_MPPT that MPPT encircles.PWM2 signal is Voltage loop PWM, passes through the RC low pass filter of R17, R18 and capacitor C 20, C21 composition, is adjusted to the reference signal VS_V of Voltage loop.PWM3 signal is electric current loop PWM, passes through the RC low pass filter of R20, R21 and capacitor C 9, C10 composition, is adjusted to the reference signal VS_I of Voltage loop.Because STM32F103 processor has so high-precision PWM and AD sampling module, when MPPT mode scanning maximum power point, can carry out very precisely trickle adjusting and accurate calculating, MPPT follows the tracks of in gamut input range precision up to more than 99.5%.
Fig. 5 is the multi-peak photovoltaic curve chart that solar panel shelters from heat or light in part in situation, and the output of photovoltaic array is subject to the impact of intensity of illumination, ambient temperature, weather condition, covering situation and extraneous load, and its output characteristic has nonlinear characteristic.In sunrise and at sunset, the shade of the formation such as the building of solar cell panel area and trees can cause the part situation of sheltering from heat or light, thereby photovoltaic curve presents multi-peak situation.As shown in Figure 5, cell panel output power curve has two peak values, and P1 is local maximum power point, if system stability is operated in this point, the maximum power point under precondition is not worked as in output, and real maximum power point is at P2 point.The utlity model has three loops controls, by regulating MPPT wherein to encircle, can in whole input voltage range, work by conditioning controller, thereby reach the performance number scanning in whole solar panel output voltage range, arm processor calculates in real time and compares the input power value that each adjusting changes Time Controller, thereby find out fast global maximum power point, when conditioning controller work input voltage is during at 110V, found out global maximum power point P2.Do not need just can effectively trace into fast maximum power point by complicated software algorithm.
The utility model embodiment utilizes and solar photovoltaic cell panel test proof, the in the situation that of sheltering from heat or light in various voltage powers and solar panel part, solar energy photovoltaic system MPPT controller based on arm processor all can find global maximum power point in 10 seconds, and tracking accuracy is up to more than 99.5%.
Claims (6)
1. a solar energy photovoltaic system control device, comprises the DC/DC conversion circuit with switching tube Q1, solar maximum power tracker, PDM keyer;
The direct-flow input end of described DC/DC conversion circuit connects the output of described solar panel, and the DC output end of described DC/DC conversion circuit connects storage battery and load;
The feedback end of described PDM keyer is connected with described solar maximum power tracker, and the pulse-width signal that produces the DC/DC conversion circuit Maximum Power Output described in controlling connects the control end of the switching tube Q1 of described DC/DC conversion circuit;
It is characterized in that: also comprise constant voltage tracker and constant current tracker, the feedback end of described PDM keyer respectively with described constant voltage tracker and constant current tracker, produce respectively the control end that the pulse-width signal of controlling described DC/DC conversion circuit output constant voltage or constant current meets the switching tube Q1 of described DC/DC conversion circuit;
Described solar maximum power tracker, constant voltage tracker and constant current tracker asynchronous working.
2. solar energy photovoltaic system control device according to claim 1, it is characterized in that: in described DC/DC conversion circuit, also comprise sustained diode 2, anti-reverse, anti-diode D1, the filter of filling of solar panel, described filter comprises inductance L 1 and filter capacitor C2; Described anti-reverse, the anti-anode that fills diode D1 connects the positive pole of solar panel, and negative electrode connects the drain electrode of described switching tube Q1, and the source electrode of described switching tube Q1 connects one end of described inductance L 1; The other end of described inductance L 1 is by filter capacitor C2 ground connection, and described filter capacitor C2 two ends are the DC output end of described DC/DC conversion circuit; Described sustained diode 2 is connected between the source electrode and ground of described switching tube Q1, the plus earth of described diode D2.
3. solar energy photovoltaic system control device according to claim 2, is characterized in that: in described DC/DC conversion circuit, also comprise filter capacitor C1, the two ends of described filter capacitor C1 connect respectively between the negative electrode and ground of described diode D1.
4. solar energy photovoltaic system control device according to claim 1, is characterized in that: described maximal power tracing device comprises maximal power tracing ring, detects the described output voltage of solar panel and the first testing circuit of output current, generates the maximum power reference signal generation module that regulates maximal power tracing reference signal;
Described maximum power reference signal generation module is connected with the output of the first described testing circuit;
Described maximal power tracing ring comprises resistance R 7, resistance R 8, resistance R 1, resistance R 3, resistance R 4, capacitor C 3, amplifier U1B;
The positive pole of described solar panel is by resistance R 7 and resistance R 8 series winding ground connection, and the tie point of resistance R 7 and resistance R 8 connects the in-phase end of described amplifier U1B by resistance R 4;
The maximum power reference signal of described maximum power reference signal generation module output connects the out-phase end of described amplifier U1B by resistance R 3, described resistance R 1 is connected in parallel between the out-phase end and output of amplifier U1B;
The feedback pin of the PDM keyer described in the output termination of amplifier U1B.
5. solar energy photovoltaic system control device according to claim 1, is characterized in that: described constant voltage tracker comprises the second testing circuit of the voltage of Voltage loop, the output voltage that detects described solar panel and output current, storage battery, the constant voltage reference signal generator module that generation regulates constant voltage reference signal;
The output of the second described testing circuit connects constant voltage reference signal generator module;
Described Voltage loop comprises resistance R 10, resistance R 11, resistance R 12, resistance R 13, resistance R 14, capacitor C 6, capacitor C 7, capacitor C 8, amplifier U2A;
The input of described load is by resistance R 13 and resistance R 14 series winding ground connection, and described capacitor C 8 is in parallel with described resistance R 14, and the tie point of resistance R 13 and resistance R 14 connects the out-phase end of described amplifier U2A by resistance R 12;
The constant voltage reference signal of described constant voltage reference signal generator module output connects the in-phase end of described amplifier U2A by resistance R 11;
The out-phase end that described resistance R 6 and capacitor C 6 series windings are concatenated into described amplifier U2A after can be in parallel with described capacitor C 7 with export between.
6. solar energy photovoltaic system control device according to claim 1, is characterized in that: described constant current tracker comprises the three testing circuit of the voltage of electric current loop, the output voltage that detects described solar panel and output current, storage battery, the constant current reference signal generation module that generation regulates constant current reference signal;
The output termination constant current reference signal generation module of described three testing circuit;
Described electric current loop comprises resistance R 2, resistance R 5, resistance R 6 and capacitor C 4, capacitor C 5, amplifier U1A;
The analog signal of described load input current connects the out-phase end of described amplifier U1A by resistance R 6;
The constant current reference signal of described constant current reference signal generation module output connects the in-phase end of described amplifier U1A by resistance R 5;
Between being concatenated into the out-phase end of described amplifier U1A after in parallel with described capacitor C 5 after described resistance R 2 and capacitor C 4 series windings and exporting.
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