CN107681890B - Multi-mode control circuit suitable for wide input DC-DC - Google Patents
Multi-mode control circuit suitable for wide input DC-DC Download PDFInfo
- Publication number
- CN107681890B CN107681890B CN201711013688.7A CN201711013688A CN107681890B CN 107681890 B CN107681890 B CN 107681890B CN 201711013688 A CN201711013688 A CN 201711013688A CN 107681890 B CN107681890 B CN 107681890B
- Authority
- CN
- China
- Prior art keywords
- mode
- main circuit
- sample
- analog
- uin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a multi-mode control circuit suitable for wide input DC-DC, which judges and switches the working mode of a DC-DC main circuit in an energy system of a near space aircraft, and comprises the following components: the sampling unit is used for collecting input and output signals of the DC-DC main circuit; the analog-to-digital conversion unit is used for performing analog-to-digital conversion on the input and output signals; the logic unit is used for carrying out initial judgment and switching judgment on various working modes of the DC-DC main circuit and outputting a digital pulse width modulation signal according to a switching judgment result; a level conversion unit which converts the digital pulse width modulation signal into an analog pulse width modulation signal; and the driving unit is used for converting the analog pulse width modulation signal into a driving signal and driving the DC-DC main circuit to switch the working mode. The invention adopts a digital control mode, realizes effective judgment and switching of various DC-DC working modes under the input condition of wide-range voltage, meets the complex flight working condition of the near space aircraft, and has the characteristics of high reliability, integration and intellectualization.
Description
Technical Field
The invention relates to a multi-mode control circuit, in particular to a wide-input DC-DC multi-mode control circuit which is suitable for an energy system of a near space vehicle.
Background
With the complexity of the work task of the near space aircraft and the expansion of the load capacity, higher requirements are put forward on the technologies of the power supply capacity, the power density, the conversion efficiency, the configuration management and the like of the aircraft energy system. As a main part of an energy system of a near space aircraft, a power supply control module needs to meet the requirements of high reliability, integration and intellectualization besides meeting the basic performance index.
Because the working environment of the adjacent space aircraft is frequent and changeable, the influence of the environmental temperature is large in the flying process, and the working voltage range of the solar cell array is wide, in order to utilize the Power generation capacity of the solar cell array to the Maximum extent, the Maximum Power Point Tracking (MPPT) technology is required to be adopted to track the Maximum Power Point of the solar cell array in real time, and under the input condition of wide-range voltage, effective judgment and switching of various working modes of DC-DC (direct current-direct current) in Power conversion are realized. Wherein, the DC-DC multiple working modes comprise: MPPT buck mode, pass-through mode, MPPT boost mode, and constant voltage mode.
In the prior art, a power supply control module of an energy system of a near space vehicle adopts a traditional analog control circuit to judge and switch various DC-DC working modes. However, the conventional analog control circuit limits the improvement of the performance of the power control module and the development space of the energy system. Firstly, because of more DC-DC working modes, a large number of discrete components are required to be adopted by the analog control circuit, so that the reliability is difficult to evaluate, and the integration level is difficult to optimize; secondly, the analog control circuit is difficult to realize the detection and management functions of the energy system, more auxiliary circuits need to be designed, the debugging process is complicated, and a large amount of time, labor and material cost is consumed.
In summary, there is a need for a multi-mode digital control circuit suitable for wide-input DC-DC, which can effectively determine and switch between the MPPT buck mode, the pass-through mode, the MPPT boost mode, and the constant voltage mode, and has the characteristics of high reliability, integration, and intelligence.
Disclosure of Invention
The invention aims to provide a multi-mode control circuit suitable for wide-input DC-DC, which adopts a digital control mode to realize effective judgment and switching of various working modes of DC-DC under the input condition of wide-range voltage, meets the complicated flight working condition of a near space aircraft, and has the characteristics of high reliability, integration and intellectualization.
In order to achieve the above object, the present invention provides a multi-mode control circuit for wide input DC-DC, which determines and switches the operation mode of a main DC-DC circuit in an energy system of a near space vehicle, comprising: the sampling unit is used for collecting input and output signals of the DC-DC main circuit; the analog-to-digital conversion unit is connected with the acquisition unit and is used for performing analog-to-digital conversion on the acquired input and output signals to obtain corresponding digital signals; the logic unit is connected with the analog-to-digital conversion unit, performs initial judgment and switching judgment on the multiple working modes of the DC-DC main circuit according to the received digital signal and initial judgment conditions and smooth switching conditions of the multiple DC-DC working modes set in the logic unit, and outputs a corresponding digital pulse width modulation signal according to a switching judgment result; the level conversion unit is connected with the logic unit and converts the received digital pulse width modulation signals into corresponding analog pulse width modulation signals; and the driving unit is respectively connected with the level conversion unit and the DC-DC main circuit, converts the received analog pulse width modulation signal into a corresponding driving signal, and drives the DC-DC main circuit to switch the working mode.
The near space aircraft energy system consists of a power supply control module, a solar cell array and a lithium ion storage battery pack, wherein the solar cell array and the lithium ion storage battery pack are respectively connected with the power supply control module; wherein, the power control module comprises: the solar battery pack comprises a DC-DC main circuit and a multi-mode control circuit, wherein the DC-DC main circuit is respectively connected with a solar battery array and a lithium ion storage battery pack, and the multi-mode control circuit is connected with the DC-DC main circuit; the DC-DC main circuit is provided with a switching device Q1、Q2、Q3And Q4And (4) forming.
The acquisition unit comprises: the input voltage sampling unit is connected with the solar cell array through the DC-DC main circuit and collects the input voltage U transmitted to the DC-DC main circuit from the solar cell array in real timein(ii) a The input current sampling unit is connected with the solar cell array through the DC-DC main circuit; real-time acquisition of input current I transmitted from solar cell array to DC-DC main circuitin(ii) a The output voltage sampling unit is connected with the lithium ion storage battery pack through the DC-DC main circuit and collects the output voltage U transmitted to the lithium ion storage battery pack from the input DC-DC main circuit in real timeout。
Wherein, the input voltage sampling unit is used for sampling the input voltage U acquired in real timeinCarrying out differential sampling and partial pressure processing, and converting into analog signal Uin_sampleAnd transmitting to the analog-to-digital conversion unit; the input current sampling unit adopts lowThe side current detection technology is used for collecting the input current I in real timeinConversion to analogue signals Iin_sampleAnd transmitting to the analog-to-digital conversion unit; the output voltage sampling unit is used for sampling the output voltage U acquired in real timeoutCarrying out differential sampling and partial pressure processing, and converting into analog signal Uout_sampleAnd transmitting to the analog-to-digital conversion unit; the output voltage sampling unit and the input voltage sampling unit adopt the same voltage division ratio.
The analog-to-digital conversion unit is connected with the logic unit through a data bus, and the analog-to-digital conversion unit receives an analog signal Uin_sample、Iin_sampleAnd Uout_sampleAfter analog-to-digital conversion, a corresponding digital signal D is obtainedUin_sample、DIin_sampleAnd DUout_sampleAnd transmitted to the logic unit.
The logic unit is digitally controlled by adopting an FPGA, and the initial judgment conditions of various DC-DC working modes set in the logic unit are as follows:
reference voltage digital quantity D for setting MPPT buck mode, direct-through mode, MPPT boost mode and constant voltage modeUin_refAnd DUout_ref；
When D is presentUin_ref<DUout_refAnd DUin_sample-DUout_sample>When K is needed, the DC-DC main circuit is judged to work in an MPPT voltage reduction mode;
when D is presentUin_ref<DUout_refand-K is not more than DUin_sample-DUout_sampleWhen the voltage is less than or equal to K, the DC-DC main circuit is judged to work in a direct-through mode;
when D is presentUin_ref<DUout_refAnd DUin_sample-DUout_sample<When K is higher than the Maximum Power Point (MPPT), the DC-DC main circuit is judged to work in an MPPT boosting mode;
when D is presentUout_ref≤DUin_refWhen the DC-DC main circuit works in the constant voltage mode, judging that the DC-DC main circuit works in the constant voltage mode;
wherein K is a preset digital constant.
The smooth switching conditions of the DC-DC multiple working modes set in the logic unit are as follows:
when the DC-DC main circuit works in the MPPT voltage reduction mode, if D is greater than DUin_ref<DUout_refand-K is not more than DUin_sample-DUout_sampleIf the voltage is less than or equal to K, switching the working mode of the DC-DC main circuit to be judged as a direct-through mode;
when the DC-DC main circuit works in the through mode, the value D of the DC-DC main circuit when the DC-DC main circuit is switched to the through mode is recordedUin_sampleA, and receives D from the A/D conversion unit in real timeUin_sample(ii) a If D isUin_sample–A>K, switching the working mode of the DC-DC main circuit to be determined as an MPPT voltage reduction mode; if A-DUin_sample>K, switching the working mode of the DC-DC main circuit to be determined as an MPPT boosting mode; wherein A is a digital constant;
when the DC-DC main circuit works in the MPPT boosting mode, if D is greater than the maximum power pointUin_ref<DUout_refand-K is not more than DUin_sample-DUout_sampleIf the voltage is less than or equal to K, switching the working mode of the DC-DC main circuit to be judged as a direct-through mode; if D isUout_ref≤DUin_refSwitching the working mode of the DC-DC main circuit to be a constant voltage mode;
when the DC-DC main circuit works in the constant voltage mode, if DUin_ref<DUout_refAnd switching the working mode of the DC-DC main circuit to be the MPPT boosting mode.
The logic unit outputs a corresponding digital pulse width modulation signal D according to the switching judgment result of the working mode of the DC-DC main circuitPWM1、DPWM2、DPWM3And DPWM4；
When the DC-DC main circuit is switched and judged to be in the MPPT voltage reduction mode, the digital pulse width modulation signal D output by the logic unitPWM1And DPWM2For complementary pulse signals, DPWM3Is a high level signal, DPWM4Is a low level signal;
when the DC-DC main circuit is switched and judged to be in a through mode, the digital pulse width modulation signal D output by the logic unitPWM1And DPWM3Is a high level signal, DPWM2And DPWM4Is a low level signal;
when the DC-DC main circuit is switched and judged to be in the MPPT boosting mode or the constant voltage mode, the digital pulse width modulation signal D output by the logic unitPWM1Is a high level signal, DPWM2Is a low level signal, DPWM3And DPWM4Are complementary pulse signals.
The level conversion unit receives the digital pulse width modulation signal DPWM1、DPWM2、DPWM3And DPWM4Respectively converted into corresponding analog pulse width modulation signals APWM1、APWM2、APWM3And APWM4。
The drive unit receives the analog pulse width modulation signal APWM1、APWM2、APWM3And APWM4Respectively converted into corresponding driving signals AGATE1、AGATE2、AGATE3And AGATE4Respectively corresponding to the switching devices Q in the driving DC-DC main circuit1、Q2、Q3And Q4And controlling the DC-DC main circuit to switch the working mode according to the switching judgment result.
In summary, the multi-mode control circuit applicable to the wide-input DC-DC provided by the invention is used for effectively judging and switching the MPPT buck mode, the direct-connection mode, the MPPT boost mode and the constant-voltage mode under the input condition of the wide-range voltage by acquiring the input and output signals in real time and performing analog-to-digital conversion and logic control aiming at the frequently variable working environment of the adjacent space vehicle, so as to meet the complicated flight condition of the adjacent space vehicle. In addition, the invention replaces the traditional analog control strategy by a digital control mode taking an FPGA chip as a core, and meets the requirements of the adjacent space aircraft on high reliability, integration and intellectualization of the power supply control module.
Drawings
FIG. 1 is a block diagram of a minimum energy system for a near space vehicle according to the present invention;
FIG. 2 is a schematic structural diagram of a DC-DC main circuit adopting a wide input topology in the present invention;
FIG. 3 is a block diagram of a multi-mode control circuit suitable for wide input DC-DC in the present invention;
FIG. 4 is a diagram illustrating a multi-mode initial decision and smooth handover condition in the present invention.
Detailed Description
The following describes a preferred embodiment of the multi-mode control circuit suitable for wide-input DC-DC according to the present invention with reference to fig. 1 to 4.
As shown in fig. 1, the structure block diagram of the minimum energy system of the near space vehicle in the present invention is composed of a power control module, and a solar cell array, a lithium ion battery pack and a power load which are respectively connected to the power control module; and, the output voltage U of the power control moduleoutThe voltage of the lithium ion storage battery pack is determined; input voltage U of power supply control moduleinAnd an input current IinIs determined by the voltage and current of the solar cell array. Wherein, the power control module comprises: the DC-DC main circuit is respectively connected with the solar cell array and the lithium ion storage battery; and a multi-mode control circuit connected to the DC-DC main circuit.
The working voltage of the solar cell array can be greatly changed along with the change of the temperature during the flight process of the adjacent space aircraft. Therefore, the DC-DC main circuit needs to adopt a wide input topology as shown in fig. 2, and four DC-DC operation modes in power conversion, namely, an MPPT buck mode, a through mode, an MPPT boost mode, and a constant voltage mode, are respectively realized by controlling on/off of the switching devices Q1 to Q4. In each DC-DC operation mode, the on-off states of the corresponding switching devices Q1 to Q4 are as follows:
MPPT decompression mode: q1 is used as a switching tube, Q2 is used as a synchronous rectifier tube, Q3 is in a normally-on state, and Q4 is in a normally-off state;
a through mode: q1 and Q3 are in a normally-on state, and Q2 and Q4 are in a normally-off state;
MPPT boost mode: q1 is in normal on state, Q2 is in normal off state, Q3 is as synchronous rectifier, Q4 is as switch tube;
constant voltage mode: q1 is in normal on state, Q2 is in normal off state, Q3 is used as synchronous rectifier, Q4 is used as switch tube.
Aiming at the DC-DC main circuit adopting the wide input topological structure, the invention provides a multi-mode control circuit shown in figure 3, which is used for an energy system close to a spacecraft and realizes the judgment and switching of various DC-DC working modes. The multi-mode control circuit includes: the sampling unit is used for collecting input and output signals of a DC-DC main circuit of an energy system of the spacecraft; the analog-to-digital conversion unit is connected with the acquisition unit and is used for performing analog-to-digital conversion on the acquired input and output signals to obtain corresponding digital signals; the logic unit is connected with the analog-to-digital conversion unit, performs initial judgment and switching judgment on an MPPT (maximum power point tracking) buck mode, a direct-through mode, an MPPT boost mode and a constant voltage mode of the DC-DC main circuit according to the received digital signal and initial judgment conditions and smooth switching conditions of various DC-DC working modes set in the logic unit, and outputs a corresponding digital pulse width modulation signal according to a switching judgment result; the level conversion unit is connected with the logic unit and converts the received digital pulse width modulation signal into a corresponding analog pulse width modulation signal; and the driving unit is respectively connected with the level conversion unit and the DC-DC main circuit, converts the received analog pulse width modulation signal into a corresponding driving signal and drives the DC-DC main circuit to switch the working mode.
The acquisition unit comprises: the input voltage sampling unit is connected with the solar cell array through the DC-DC main circuit and collects the input voltage U transmitted to the DC-DC main circuit from the solar cell array in real timein(ii) a The input current sampling unit is connected with the solar cell array through the DC-DC main circuit; real-time acquisition of input current I transmitted from solar cell array to DC-DC main circuitin(ii) a The output voltage sampling unit is connected with the lithium ion storage battery pack through the DC-DC main circuit and collects the output voltage U transmitted to the lithium ion storage battery pack from the input DC-DC main circuit in real timeout。
Wherein, the input voltage sampling unit is used for sampling the input voltage U acquired in real timeinCarrying out differential sampling and voltage division processing, and converting into an analog signal U in the range of 0-5Vin_sampleAnd transmitting to the analog-to-digital conversion unit; the input current sampling unit adopts a low-side current detection technology, and the input current I acquired in real time is detected by a high-precision current sampling chipinConversion into an analog signal I in the range of 0 to 5Vin_sampleAnd transmitting to the analog-to-digital conversion unit; the output voltage sampling unit is used for sampling the output voltage U acquired in real timeoutCarrying out differential sampling and voltage division processing, and converting into an analog signal U in the range of 0-5Vout_sampleAnd transmitting to the analog-to-digital conversion unit; the output voltage sampling unit and the input voltage sampling unit adopt the same voltage division ratio.
The analog-to-digital conversion unit receives an analog signal Uin_sample、Iin_sampleAnd Uout_samplePerforming quantization processing, and performing analog-to-digital conversion to generate digital signal DUin_sample、DIin_sampleAnd DUout_sample。
The logic unit and the analog-to-digital conversion unit are connected through a data bus and receive a digital signal DUin_sample、DIin_sampleAnd DUout_sample。
The logic unit adopts an FPGA (Field Programmable Gate Array) chip as a core to carry out digital control, and effectively judges and switches an MPPT (maximum power point tracking) buck mode, a direct-through mode, an MPPT boost mode and a constant voltage mode of the DC-DC main circuit according to a received digital signal and initial judgment conditions and smooth switching conditions of various DC-DC working modes set in the logic unit.
As shown in fig. 4, the initial determination conditions of the DC-DC multiple operating modes set in the logic unit are as follows:
setting reference voltage digital quantity D of MPPT buck mode, direct mode, MPPT boost mode (all belonging to non-constant voltage mode) and constant voltage modeUin_refAnd DUout_ref；
When D is presentUin_ref<DUout_refAnd DUin_sample-DUout_sample>When K is needed, the DC-DC main circuit is judged to work in an MPPT voltage reduction mode;
when D is presentUin_ref<DUout_refand-K is not more than DUin_sample-DUout_sampleWhen the voltage is less than or equal to K, the DC-DC main circuit is judged to work in a direct-through mode;
when D is presentUin_ref<DUout_refAnd DUin_sample-DUout_sample<When K is higher than the Maximum Power Point (MPPT), the DC-DC main circuit is judged to work in an MPPT boosting mode;
when D is presentUout_ref≤DUin_refWhen the DC-DC main circuit works in the constant voltage mode, judging that the DC-DC main circuit works in the constant voltage mode;
wherein K is a preset digital constant.
As shown in fig. 4, the smooth switching conditions of the DC-DC multiple operating modes set in the logic unit are as follows:
when the DC-DC main circuit works in the MPPT voltage reduction mode, if D is greater than DUin_ref<DUout_refand-K is not more than DUin_sample-DUout_sampleIf the voltage is less than or equal to K, switching the working mode of the DC-DC main circuit to be judged as a direct-through mode;
when the DC-DC main circuit works in the through mode, the value D of the DC-DC main circuit when the DC-DC main circuit is switched to the through mode is recordedUin_sampleA and receives a new D from the analog-to-digital conversion unit in real timeUin_sample(ii) a If D isUin_sample–A>K, switching the working mode of the DC-DC main circuit to be determined as an MPPT voltage reduction mode; if A-DUin_sample>K, switching the working mode of the DC-DC main circuit to be determined as an MPPT boosting mode; wherein A is a digital constant;
when the DC-DC main circuit works in the MPPT boosting mode, if D is greater than the maximum power pointUin_ref<DUout_refand-K is not more than DUin_sample-DUout_sampleIf the voltage is less than or equal to K, switching the working mode of the DC-DC main circuit to be judged as a direct-through mode; if D isUout_ref≤DUin_refSwitching the working mode of the DC-DC main circuit to be a constant voltage mode;
when the DC-DC main circuit works in the constant voltage mode, if DUin_ref<DUout_refAnd switching the working mode of the DC-DC main circuit to be the MPPT boosting mode.
The logic unit is based on DC-The switching judgment result of the working mode of the DC main circuit outputs a corresponding digital pulse width modulation signal D ranging from 0 to 3.3VPWM1、DPWM2、DPWM3And DPWM4；
When the DC-DC main circuit is switched and judged to be in the MPPT voltage reduction mode, the digital pulse width modulation signal D output by the logic unitPWM1And DPWM2For complementary pulse signals, DPWM3Is a high level signal, DPWM4Is a low level signal;
when the DC-DC main circuit is switched and judged to be in a through mode, the digital pulse width modulation signal D output by the logic unitPWM1And DPWM3Is a high level signal, DPWM2And DPWM4Is a low level signal;
when the DC-DC main circuit is switched and judged to be in the MPPT boosting mode or the constant voltage mode, the digital pulse width modulation signal D output by the logic unitPWM1Is a high level signal, DPWM2Is a low level signal, DPWM3And DPWM4Are complementary pulse signals.
The level conversion unit receives the digital pulse width modulation signal DPWM1、DPWM2、DPWM3And DPWM4Respectively converted into corresponding analog pulse width modulation signals A in the range of 0 to 5VPWM1、APWM2、APWM3And APWM4。
The drive unit receives the analog pulse width modulation signal APWM1、APWM2、APWM3And APWM4Respectively converted into corresponding driving signals AGATE1、AGATE2、AGATE3And AGATE4Respectively correspondingly driving 4 switching devices Q in the DC-DC main circuit1、Q2、Q3And Q4And controlling the DC-DC main circuit to switch the working mode according to the switching judgment result.
In summary, the multi-mode control circuit applicable to wide-input DC-DC provided by the invention is used for acquiring input and output signals in real time in a frequently variable working environment of an adjacent space vehicle, and effectively judging and switching multiple DC-DC working modes, namely an MPPT buck mode, a direct mode, an MPPT boost mode and a constant voltage mode, under the input condition of wide-range voltage through analog-to-digital conversion and logic control, so as to meet the complicated flight working condition of the adjacent space vehicle.
The multi-mode control circuit suitable for the wide-input DC-DC provided by the invention mainly utilizes a digital control mode taking an FPGA chip as a core to replace the traditional analog control strategy, and has the following advantages and beneficial effects:
1) high reliability: the core digital control algorithm in the logic circuit is realized by a software program, and discrete components in the analog control circuit are replaced, so that the influence of environmental factors such as temperature, humidity and the like on the parameters of the components is overcome, and the inherent reliability of the logic circuit is obviously improved.
2) Integration: the structure of the logic circuit is relatively simple, the PI regulator, the carrier signal generator and the like do not need to be additionally built, the layout space of the circuit is saved, the high integration of the circuit is easy to realize, and therefore the power density of the power control module is effectively improved.
3) Intelligentization: the logic circuit can store the control parameters in the register, adjust the switching frequency, the duty ratio and the like of the pulse width modulation signal waveform, and can process faults or abnormity according to signals such as voltage, current and the like acquired in real time, so that the operation of the power supply control module is more intelligent.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (8)
1. A multi-mode control circuit for wide input DC-DC, wherein determining and switching the operating mode of a main DC-DC circuit in a near space vehicle energy system comprises:
the sampling unit is used for collecting input and output signals of the DC-DC main circuit;
the analog-to-digital conversion unit is connected with the acquisition unit and is used for performing analog-to-digital conversion on the acquired input and output signals to obtain corresponding digital signals;
the logic unit is connected with the analog-to-digital conversion unit, performs initial judgment and switching judgment on the multiple working modes of the DC-DC main circuit according to the received digital signal and initial judgment conditions and smooth switching conditions of the multiple DC-DC working modes set in the logic unit, and outputs a corresponding digital pulse width modulation signal according to a switching judgment result;
the level conversion unit is connected with the logic unit and converts the received digital pulse width modulation signals into corresponding analog pulse width modulation signals;
the driving unit is respectively connected with the level conversion unit and the DC-DC main circuit, converts the received analog pulse width modulation signal into a corresponding driving signal and drives the DC-DC main circuit to switch the working mode;
the logic unit is digitally controlled by adopting an FPGA, and the initial judgment conditions of various DC-DC working modes set in the logic unit are as follows:
reference voltage digital quantity D for setting MPPT buck mode, direct-through mode, MPPT boost mode and constant voltage modeUin_refAnd DUout_ref；
When D is presentUin_ref<DUout_refAnd DUin_sample-DUout_sample>When K is needed, the DC-DC main circuit is judged to work in an MPPT voltage reduction mode;
when D is presentUin_ref<DUout_refand-K is not more than DUin_sample-DUout_sampleWhen the voltage is less than or equal to K, the DC-DC main circuit is judged to work in a direct-through mode;
when D is presentUin_ref<DUout_refAnd DUin_sample-DUout_sample<When K is higher than the Maximum Power Point (MPPT), the DC-DC main circuit is judged to work in an MPPT boosting mode;
when D is presentUout_ref≤DUin_refWhen the DC-DC main circuit works in the constant voltage mode, judging that the DC-DC main circuit works in the constant voltage mode;
wherein K is a preset digital constant;
the smooth switching conditions of the DC-DC multiple working modes set in the logic unit are as follows:
when the DC-DC main circuit works in the MPPT voltage reduction mode, if D is greater than DUin_ref<DUout_refand-K is not more than DUin_sample-DUout_sampleIf the voltage is less than or equal to K, switching the working mode of the DC-DC main circuit to be judged as a direct-through mode;
when the DC-DC main circuit works in the through mode, the value D of the DC-DC main circuit when the DC-DC main circuit is switched to the through mode is recordedUin_sampleA, and receives D from the A/D conversion unit in real timeUin_sample(ii) a If D isUin_sample–A>K, switching the working mode of the DC-DC main circuit to be determined as an MPPT voltage reduction mode; if A-DUin_sample>K, switching the working mode of the DC-DC main circuit to be determined as an MPPT boosting mode; wherein A is a digital constant;
when the DC-DC main circuit works in the MPPT boosting mode, if D is greater than the maximum power pointUin_ref<DUout_refand-K is not more than DUin_sample-DUout_sampleIf the voltage is less than or equal to K, switching the working mode of the DC-DC main circuit to be judged as a direct-through mode; if D isUout_ref≤DUin_refSwitching the working mode of the DC-DC main circuit to be a constant voltage mode;
when the DC-DC main circuit works in the constant voltage mode, if DUin_ref<DUout_refSwitching the working mode of the DC-DC main circuit to be determined as an MPPT boosting mode;
wherein D isUin_sample、DIin_sampleAnd DUout_sampleAre respectively an input voltage UinAnalog signal U ofin_sampleInput current IinAnalog signal I ofin_sampleAnd an output voltage UoutAnalog signal U ofout_sampleAnd carrying out analog-to-digital conversion to obtain a corresponding digital signal.
2. The multi-mode control circuit for wide-input DC-DC as claimed in claim 1, wherein the energy system of the close-proximity spacecraft is composed of a power control module, and a solar cell array and a lithium ion battery pack respectively connected to the power control module;
the power control module comprises: the solar battery pack comprises a DC-DC main circuit and a multi-mode control circuit, wherein the DC-DC main circuit is respectively connected with a solar battery array and a lithium ion storage battery pack, and the multi-mode control circuit is connected with the DC-DC main circuit;
the DC-DC main circuit is provided with a switching device Q1、Q2、Q3And Q4And (4) forming.
3. The multi-mode control circuit for wide-input DC-DC as claimed in claim 2, wherein the acquisition unit comprises:
the input voltage sampling unit is connected with the solar cell array through the DC-DC main circuit and collects the input voltage U transmitted to the DC-DC main circuit from the solar cell array in real timein；
The input current sampling unit is connected with the solar cell array through the DC-DC main circuit and collects the input current I transmitted to the DC-DC main circuit from the solar cell array in real timein；
The output voltage sampling unit is connected with the lithium ion storage battery pack through the DC-DC main circuit and collects the output voltage U transmitted to the lithium ion storage battery pack from the input DC-DC main circuit in real timeout。
4. The multi-mode control circuit for wide-input DC-DC as claimed in claim 3, wherein the input voltage sampling unit samples the input voltage U acquired in real timeinCarrying out differential sampling and partial pressure processing, and converting into analog signal Uin_sampleAnd transmitting to the analog-to-digital conversion unit;
the input current sampling unit adopts a low-side current detection technology to collect the input current I acquired in real timeinConversion to analogue signals Iin_sampleAnd transmitting to the analog-to-digital conversion unit;
the output voltage sampling unit is used for sampling the output voltage U acquired in real timeoutCarrying out differential sampling and partial pressure processing, and converting into analog signal Uout_sampleAnd transmitting to the analog-to-digital conversion unit;
the output voltage sampling unit and the input voltage sampling unit adopt the same voltage division ratio.
5. A multi-mode control circuit for wide input DC-DC as claimed in claim 4, wherein the analog-to-digital conversion unit is connected to the logic unit via a data bus, and the analog-to-digital conversion unit receives the analog signal Uin_sample、Iin_sampleAnd Uout_sampleAfter analog-to-digital conversion, a corresponding digital signal D is obtainedUin_sample、DIin_sampleAnd DUout_sampleAnd transmitted to the logic unit.
6. A multi-mode control circuit for wide input DC-DC as claimed in claim 5, wherein the logic unit outputs a corresponding digital PWM signal D according to the switching determination result of the operation mode of the DC-DC main circuitPWM1、DPWM2、DPWM3And DPWM4；
When the DC-DC main circuit is switched and judged to be in the MPPT voltage reduction mode, the digital pulse width modulation signal D output by the logic unitPWM1And DPWM2For complementary pulse signals, DPWM3Is a high level signal, DPWM4Is a low level signal;
when the DC-DC main circuit is switched and judged to be in a through mode, the digital pulse width modulation signal D output by the logic unitPWM1And DPWM3Is a high level signal, DPWM2And DPWM4Is a low level signal;
when the DC-DC main circuit is switched and judged to be in the MPPT boosting mode or the constant voltage mode, the digital pulse width modulation signal D output by the logic unitPWM1Is a high level signal, DPWM2Is a low level signal, DPWM3And DPWM4Are complementary pulse signals.
7. The multi-mode control circuit for wide-input DC-DC as claimed in claim 6, wherein the level shifter unit converts the received digital pwm signal DPWM1、DPWM2、DPWM3And DPWM4Respectively converted into corresponding analog pulse width modulation signals APWM1、APWM2、APWM3And APWM4。
8. A multi-mode control circuit for wide input DC-DC as claimed in claim 7, wherein the driving unit receives an analog PWM signal APWM1、APWM2、APWM3And APWM4Respectively converted into corresponding driving signals AGATE1、AGATE2、AGATE3And AGATE4Respectively corresponding to the switching devices Q in the driving DC-DC main circuit1、Q2、Q3And Q4And controlling the DC-DC main circuit to switch the working mode according to the switching judgment result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711013688.7A CN107681890B (en) | 2017-10-25 | 2017-10-25 | Multi-mode control circuit suitable for wide input DC-DC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711013688.7A CN107681890B (en) | 2017-10-25 | 2017-10-25 | Multi-mode control circuit suitable for wide input DC-DC |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107681890A CN107681890A (en) | 2018-02-09 |
| CN107681890B true CN107681890B (en) | 2020-06-09 |
Family
ID=61142250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711013688.7A Active CN107681890B (en) | 2017-10-25 | 2017-10-25 | Multi-mode control circuit suitable for wide input DC-DC |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107681890B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110971122A (en) * | 2018-09-28 | 2020-04-07 | 浦登有限公司 | Multi-mode power converter |
| CN109617413B (en) * | 2019-01-30 | 2024-03-01 | 上海艾为电子技术股份有限公司 | Boost chip and mode switching circuit thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203883538U (en) * | 2014-05-05 | 2014-10-15 | 江苏理工学院 | Intelligent nickel-hydrogen battery charger |
| CN106385231A (en) * | 2016-09-30 | 2017-02-08 | 上海空间电源研究所 | MPPT control circuit based on improved H-bridge DC-DC topology |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199700B (en) * | 2013-03-22 | 2015-08-12 | 成都芯源系统有限公司 | Buck-boost converter and controller and control method thereof |
-
2017
- 2017-10-25 CN CN201711013688.7A patent/CN107681890B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203883538U (en) * | 2014-05-05 | 2014-10-15 | 江苏理工学院 | Intelligent nickel-hydrogen battery charger |
| CN106385231A (en) * | 2016-09-30 | 2017-02-08 | 上海空间电源研究所 | MPPT control circuit based on improved H-bridge DC-DC topology |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107681890A (en) | 2018-02-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wang et al. | An SI-MISO boost converter with deadbeat-based control for electric vehicle applications | |
| CN103744465B (en) | Maximum power tracking method and device for photovoltaic array | |
| TWI409612B (en) | An energy harvesting system | |
| CN105356825B (en) | hybrid system energy storage device | |
| US9343967B2 (en) | Single input multiple input/output supply for energy harvest application | |
| CN103973105A (en) | Method for controlling high-dynamic properties of high-power bidirectional DC/DC converters | |
| CN107612333A (en) | A kind of control circuit and method based on two-tube buck-boost converter | |
| CN101272092A (en) | Control circuit and controlling method of switching power supply system | |
| Gao et al. | A thermoelectric generation system and its power electronics stage | |
| CN107681890B (en) | Multi-mode control circuit suitable for wide input DC-DC | |
| CN105226947A (en) | Digitlization DC/DC power module | |
| JP5915619B2 (en) | Photovoltaic power generation device and control method of solar power generation device | |
| CN111049381A (en) | Multi-objective collaborative optimization control method applied to direct-current three-level converter | |
| CN111082506B (en) | Energy management system and method suitable for autonomous multifunctional service aircraft | |
| CN104660033A (en) | Frequency conversion control method and device for single-inductor dual-output switch converter in continuous conduction mode | |
| CN110391746A (en) | PFM power-supply management system with automatic pattern switching | |
| CN104167800A (en) | Lithium battery management system and method capable of expanding communication standby power supply | |
| CN102593925A (en) | Power battery pack voltage transformation system and transformation method | |
| CN111030181A (en) | Intelligent power building block and distributed space power supply system based on same | |
| CN107831686B (en) | Digital control system for satellite power supply controller | |
| CN203434864U (en) | Step-down switching type power supply unit | |
| CN215419699U (en) | Battery power supply system of electromagnetic water meter and electromagnetic water meter | |
| CN115347788A (en) | Non-isolated three-port converter and control method and control circuit thereof | |
| Yinghua et al. | Research on No-communication Control Strategy Applied to Series MPPT Controller | |
| CN111313706A (en) | Buck-Boost converter-based IR2110 driving circuit and method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |