CN202939293U - Alternating-current 400Hz medium-frequency power supply test system with electric power feedback function - Google Patents
Alternating-current 400Hz medium-frequency power supply test system with electric power feedback function Download PDFInfo
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- CN202939293U CN202939293U CN 201220649950 CN201220649950U CN202939293U CN 202939293 U CN202939293 U CN 202939293U CN 201220649950 CN201220649950 CN 201220649950 CN 201220649950 U CN201220649950 U CN 201220649950U CN 202939293 U CN202939293 U CN 202939293U
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Abstract
The utility model relates to the field of power supply test systems and specifically relates to an alternating-current 400Hz medium-frequency power supply test system with electric power feedback function. The system is characterized by comprising a main test circuit and a test control platform, wherein the main test circuit is composed of a feedback type electronic load and a direct-current busbar, the feedback type electronic load carries out loading and disloading operations, stores tested parameters and outputs a test result under the control of the test control platform, the test control platform achieves the functions of programmable process loading, automatic loading and automatic test result output, and meanwhile, the feedback type electronic load feeds back electric power in the test process to a power grid. Due to the adoption of the structure, the electric power required for the loading test is fed back to the power grid when the alternating-current 400Hz medium-frequency power supply test system carries out loading test on a tested power supply and outputs a test result, and compared with a traditional resistive load, more than 90% of the electric energy can be saved, the test cost can be lowered, and emission and pollution can be reduced.
Description
Technical field
The utility model relates to the power detecting system field, and specifically a kind of have an interchange 400Hz intermediate frequency power supply test macro to the electrical network function by electric energy feedback.
Background technology
At present, military and civilian aircraft floor power supply all requires the communication power supply into 200V 400Hz.The development of Power Electronic Technique has promoted the universal of power electronics variable-frequency power sources series products, what Civil Aviation Airport generally adopted is static converter supply, powered by ground 50Hz civil power, transform output 200V 400Hz alternating current through static converter supply and come for aircraft utilization.
And military aircraft is due to its special environmental requirement, generally do not adopt civil power and adopt the intermediate frequency diesel engine unit to carry out Independent Power Generation, output 200V 400Hz AC power.
Military or civil aircraft no matter, due to the singularity of its equipment, be quite strict to the selection of intermediate frequency power supply, and this just requires dispatching from the factory of static converter supply and intermediate frequency diesel engine unit to carry experiment through strict performance test and long-term band.
In general, the performance test of power supply is to carry out on resistance, inductance and capacitive load with the traditional approach that band carries experiment, and as shown in figure mono-, power supply to be measured is connected to resistance wire combination, reactor combination and capacitor bank through a series of contactors.That by the corresponding contactor of switch, comes drops into and cuts out corresponding load by gear.Wherein, active power form consumption with heat on resistance wire is distributed, and on reactor, the consumption perception is idle, consumes capacitive reactive power on capacitor.Coordinate in addition again coherent detection equipment to complete the performance test of power supply, output test result.
Above method advantage is that resistance wire even load cost is very low, thereby disposable input is lower, after its obvious shortcoming is, experimentation cost each time is high, the electric energy of generator output becomes thermal energy consumption and falls, when carrying out high-power experiment, because resistance even load volume is very large, need to be equipped with special load cell and dispelled the heat.In addition, because the resistance wire even load is controlled by switch, its loading accuracy is very low, only can be loaded by gear, and increasing the gear precision needs the on-off circuits such as extra increase contactor, has increased experimental cost.
Summary of the invention
For solving above-mentioned the deficiencies in the prior art, the utility model adopts the feed-back type electronic load to replace traditional resistance, inductance and capacitive load, by unique topological structure, completing, simulation is resistive, in the time of resistance sense or capacitance-resistance load, the electric energy feedback electrical network is saved to the energy, can effectively reduce experimentation cost, in long-term band carries experiment, energy-saving effect is more obvious, simultaneously, test is controlled platform itself and is had measuring voltage, electric current, the functions such as power, the test figure added in the off-load dynamic process can be preserved in time, a kind of novel structure of saving detecting step and time and providing, stable performance, lightweight, volume is little, the 400Hz intermediate frequency power supply test macro that testing cost is low.
The utility model solves the technical scheme that its technical matters adopts:
A kind of interchange 400Hz intermediate frequency power supply test macro with electric energy feedback function, it is characterized in that being provided with test main circuit and test control platform, the test main circuit is comprised of feed-back type electronic load and DC master row, control platform control feed-back type electronic load by test and added the off-load operation, store the parameter of surveying simultaneously, and output test result, test is controlled platform and has been realized working out the loading flow process, automatically load, automatically the function outputed test result, simultaneously the feed-back type electronic load again by the electric energy feedback in test process to electrical network, with respect to traditional ohmic load, can save the energy more than 90%, reduce experimental cost, reduce discharge and pollute, described feed-back type electronic load comprises current regulating module and energy feedback module, current regulating module and energy feedback module are connected in parallel on DC master row, current regulating module is comprised of PWM rectification circuit and filter inductance, by three phase full bridge the electric circuit constitute PWM(width modulation) rectification circuit, form three groups of brachium pontis by six insulated gate bipolar power tubes (IGBT), the three road PWM trigger pips that power-supply controller of electric sends, be divided into six tunnels after power driver module, thereby the switch on and off that drives respectively 6 IGBT is realized the adjusting of size of current phase place, be beneficial to 200V ± 15%, the input ac voltage of 400Hz ± 15% boosts to into the 750V direct current by the rectification of PWM rectification circuit, according to the setting signal of test control platform, come fine adjustment by the current value of rectification circuit again, realize value-added tax function, simultaneously, carry out filtering by filter inductance, the current harmonics of filtering electric current medium-high frequency, the energy feedback module is comprised of PWM inverter circuit and LC filtering circuit, by three phase full bridge the electric circuit constitute PWM(width modulation) inverter circuit, form three groups of brachium pontis by six insulated gate bipolar power tubes (IGBT), the three road PWM trigger pips that power-supply controller of electric sends, be divided into six tunnels after power driver module, thereby the switch on and off that drives respectively 6 IGBT is realized the feedback grid of energy, so that the 750V DC voltage is converted to 380V by the three phase full bridge inverter circuit, the three-phase alternating voltage of 50Hz, with electrical network, carry out grid-connected, feedback electric energy, DC master row is comprised of three copper bars and DC filter capacitor, the 750V DC voltage that the current regulating module rectification is generated is carried out the effect that energy snubber is played in filtering simultaneously, in addition, DC master row can a plurality of current regulating module in parallel and energy feedback module, realize that the multichannel AC input detects and the multi-channel parallel feedback simultaneously, described test is controlled platform and is comprised the CPU control module, analog signal detection module, power driver module, demonstration/communication module, analog signal detection module, power driver module and demonstration/communication module are connected to the CPU control module by shielded multiconductor cable respectively, analog signal detection module completes input three-phase voltage and three-phase current, DC master row voltage, the detection of grid-connected three-phase voltage and three-phase current, deliver to the CPU control module by shielded multiconductor cable, the CPU control module is by the A/D sampling A/D chip, analog quantity is changed into to digital quantity, carry out computing by digital signal processor unit (DSP) on sheet simultaneously, calculate needed real-time detector data, produce and control the PWM(width modulation that IGBT opens shutoff) signal, then send to two power driver modules the shutoff of opening that pwm signal is controlled insulated gate bipolar power tube (IGBT) in rectification circuit and inverter circuit respectively by 16 core cables, control in this way the energy flow in whole system, demonstration/communication module is by 16 core cables, with the CPU control module, by RS232, use the MODBUS communications protocol to be connected, pass on loading command and relative parameters setting to it, simultaneously, the real-time detector data that will obtain from the CPU control module shows by display screen, and can transfer to outside industrial computer by the RS485 communicating circuit and controlled.
Current regulating module in the utility model can adopt the three-phase three-wire system current control module, does not connect the N line, and the feed-back type electronic load can be configured to the test mode of three-phase three-wire system automatically.
Current regulating module in the utility model can also adopt the three-phase four-wire system current control module, from DC master row voltage neutral point, draws the N line, the feed-back type electronic load is configured to the test mode of three-phase four-wire system.
Current regulating module in the utility model can also adopt three-phase three-wire system current control module and three-phase four-wire system current control module to share the test mode of DC master row, make electric current accurately control and deliver to busbar, realize the function that multichannel miniwatt power supply to be measured loads simultaneously, the concentration of energy of can be simultaneously three-phase three-wire system current control module and three-phase four-wire system current control module being sent here by 11 of high-power energy feedback modules is fed back to electrical network, guarantee the stable of busbar voltage, so only adopt the form of a feedback module just can effectively reduce costs.
Current regulating module in the utility model can adopt three-phase instantaneous power control strategy, abc tri-phase coordinate systems are become to three orthogonal axes coordinate systems by the Clarke shift conversion, it is α β 0 coordinate system, it is the p-q theory, adopt the PWM rectifier of this control strategy both can guarantee to carry out accurate load operation in input voltage wide fluctuations situation, in the time of can realizing loading by the phase differential of controlling three-phase current and input voltage again, power factor be adjustable, realizes simulation resistance sense load and capacitance-resistance load.
The beneficial effects of the utility model are: due to the power detecting system that has adopted this energy feedback, there is the advantages such as the novel structure volume is little, lightweight, equipment cost is low, can, by the energy feedback more than 90% that became heat exhaustion in the past to electrical network, experimental cost and floor area have greatly been saved.
The accompanying drawing explanation
Fig. 1 is the resistance inductance capacitance pattern diagram in existing load technology.
Fig. 2 is the interchange 400Hz intermediate frequency power supply test macro schematic diagram that the utility model adopts.
Fig. 3 is the feed-back type load three-phase three-wire system topology diagram that the utility model adopts.
Fig. 4 is the feed-back type load three-phase four-wire system topology diagram that the utility model adopts.
Fig. 5 is that the platform feature structural drawing is controlled in the 400Hz intermediate frequency power supply test that the utility model adopts.
Fig. 6 is the structural representation of many load modules parallel connection in the utility model.
Reference numeral: platform 4, power supply to be measured 6, PWM rectification circuit 11, filter inductance 12, positive pole 21, neutral point 22, negative pole 23, DC filter capacitor 24,25, PWM inverter circuit 31, filter inductance 32, filter capacitor 33, CPU control module 41, analog signal detection module 42, (rectification 43, inversion 44, demonstration/communication module 45, three-phase voltage 421, three-phase current 422, DC master row voltage 423, three-phase voltage 424, three-phase current 425 are controlled in current regulating module 1, DC master row 2, energy feedback module 3, test.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is further illustrated:
As shown in drawings, a kind of interchange 400Hz intermediate frequency power supply test macro with electric energy feedback function, it is characterized in that being provided with test main circuit and test control platform, the test main circuit is comprised of feed-back type electronic load and DC master row 2, control platform control feed-back type electronic load by test and added the off-load operation, store the parameter of surveying simultaneously, and output test result, test is controlled platform and has been realized working out the loading flow process, automatically load, automatically the function outputed test result, simultaneously the feed-back type electronic load again by the electric energy feedback in test process to electrical network, with respect to traditional ohmic load, can save the energy more than 90%, reduce experimental cost, reduce discharge and pollute, described feed-back type electronic load comprises current regulating module 1 and energy feedback module 3, current regulating module 1 is connected in parallel on DC master row 2 with energy feedback module 3, current regulating module 1 is comprised of PWM rectification circuit 11 and filter inductance 12, the PWM(width modulation) rectification circuit 11 is by the three phase full bridge the electric circuit constitute, form three groups of brachium pontis by six insulated gate bipolar power tubes (IGBT), the three road PWM trigger pips that power-supply controller of electric sends, be divided into six tunnels after power driver module, thereby the switch on and off that drives respectively 6 IGBT is realized the adjusting of size of current phase place, be beneficial to 200V ± 15%, the input ac voltage of 400Hz ± 15% boosts to into the 750V direct current by 11 rectifications of PWM rectification circuit, carry out fine adjustment according to the setting signal of test control platform again, current value by rectification circuit, realize value-added tax function, simultaneously, carry out filtering by filter inductance 12, the current harmonics of filtering electric current medium-high frequency, energy feedback module 3 is comprised of PWM inverter circuit 31 and LC filtering circuit 32, by three phase full bridge the electric circuit constitute PWM(width modulation) inverter circuit 31, form three groups of brachium pontis by six insulated gate bipolar power tubes (IGBT), the three road PWM trigger pips that power-supply controller of electric sends, be divided into six tunnels after power driver module, thereby the switch on and off that drives respectively 6 IGBT is realized the feedback grid of energy, so that the 750V DC voltage is converted to 380V by three phase full bridge inverter circuit 31, the three-phase alternating voltage of 50Hz, with electrical network 5, carry out grid-connected, feedback electric energy, DC master row 2 is by three copper bars and DC filter capacitor 24, 25 form, the 750V DC voltage that 1 rectification generates to current regulating module is carried out the effect that energy snubber is played in filtering simultaneously, in addition, DC master row 2 can a plurality of current regulating module 1 in parallel and energy feedback module 3, realize that the multichannel AC input detects and the multi-channel parallel feedback simultaneously, described test is controlled platform and is comprised the CPU control module, analog signal detection module, power driver module, demonstration/communication module, analog signal detection module, power driver module and demonstration/communication module are connected to the CPU control module by shielded multiconductor cable respectively, analog signal detection module completes input three-phase voltage and three-phase current, DC master row voltage, the detection of grid-connected three-phase voltage and three-phase current, deliver to the CPU control module by shielded multiconductor cable, the CPU control module is by the A/D sampling A/D chip, analog quantity is changed into to digital quantity, carry out computing by digital signal processor unit (DSP) on sheet simultaneously, calculate needed real-time detector data, produce and control the PWM(width modulation that IGBT opens shutoff) signal, then send to two power driver modules the shutoff of opening that pwm signal is controlled insulated gate bipolar power tube (IGBT) in rectification circuit 11 and inverter circuit 31 respectively by 16 core cables, control in this way the energy flow in whole system, demonstration/communication module is by 16 core cables, with the CPU control module, by RS232, use the MODBUS communications protocol to be connected, pass on loading command and relative parameters setting to it, simultaneously, the real-time detector data that will obtain from the CPU control module shows by display screen, and can transfer to outside industrial computer by the RS485 communicating circuit and controlled.
Current regulating module 1 in the utility model can adopt the three-phase three-wire system current control module, does not connect the N line, and the feed-back type electronic load can be configured to the test mode of three-phase three-wire system automatically.
Current regulating module 1 in the utility model can also adopt the three-phase four-wire system current control module, from DC master row 2 voltage neutral points 22, draws the N line, the feed-back type electronic load is configured to the test mode of three-phase four-wire system.
Current regulating module 1 in the utility model can also adopt three-phase three-wire system current control module and three-phase four-wire system current control module to share the test mode of DC master row 2, make electric current accurately control and deliver to busbar, realize the function that multichannel miniwatt power supply to be measured loads simultaneously, the concentration of energy of can be simultaneously three-phase three-wire system current control module and three-phase four-wire system current control module being sent here by 11 of high-power energy feedback modules is fed back to electrical network 5, guarantee the stable of busbar voltage, so only adopt the form of a feedback module just can effectively reduce costs.
Current regulating module 1 in the utility model can adopt three-phase instantaneous power control strategy, abc tri-phase coordinate systems are become to three orthogonal axes coordinate systems by the Clarke shift conversion, it is α β 0 coordinate system, it is the p-q theory, adopt the PWM rectification circuit of this control strategy both can guarantee to carry out accurate load operation in input voltage wide fluctuations situation, in the time of can realizing loading by the phase differential of controlling three-phase current and input voltage again, power factor be adjustable, realizes simulation resistance sense load and capacitance-resistance load.
1, shown in feed-back type electronic load figure tri-, be provided with the three-phase voltage amplitude 200V of power supply to be measured 6 outputs ± 15%, frequency 400Hz ± 15%, current regulating module 1 is by PWM rectification circuit 11, and filter inductance 12 forms, and input ac voltage is rectified into to the 750V direct current, DC master row 2 is by three copper bars: anodal 21, neutral point 22, negative pole 23 forms with DC filter capacitor 24,25.The 750V DC voltage that 1 rectification generates to current regulating module is carried out the effect that energy snubber is played in filtering simultaneously.
2,, shown in figure five, the test of 400Hz intermediate frequency power supply is controlled platform 4 and is comprised CPU control module 41, analog signal detection module 42, power driver module (rectification 43, inversion 44), demonstration/communication module 45.
Analog signal detection module 42 completes input three-phase voltage 421 and three-phase current 422, DC master row voltage 423, the detection of grid-connected three-phase voltage 424 and three-phase current 425.
Deliver to CPU control module 41 by shielded multiconductor cable, the CPU control module is by the A/D sampling A/D chip, analog quantity is changed into to digital quantity, carry out computing by digital signal processor unit (DSP) on sheet simultaneously, calculate needed real-time detector data, produce and control the PWM(width modulation that IGBT opens shutoff) signal.
Then send pwm signal to two power driver modules (rectification 43, inversion 44) respectively and control the IGBT(insulated gate bipolar power tube in rectification module and inversion module by 16 core cables) open shutoff.
Demonstration/communication module 45 is by 16 core cables, with the CPU control module, by RS232, use the MODBUS communications protocol to be connected, pass on loading command and relative parameters setting to it, simultaneously, the real-time detector data that will obtain from the CPU control module shows by display screen, and can transfer to outside industrial computer by the RS485 communicating circuit and realize Remote.
3,, as shown in figure tetra-, electronic load can be drawn the N line current loop of N line unbalance load while loading as three-phase four-wire system from the neutral point 22 of DC master row 2.When this N line is unsettled while not connecing, the load mode that electronic load can be configured to three-phase three-wire system automatically as shown in Figure 3.
4, as shown in figure six, because this load has been adopted busbar and has independently been become the mode of module, three-phase four-wire system current control module 9, 10 liang of class current modules of three-phase three-wire system current control module can be shared busbar positive pole 21, neutral point 22 and negative pole 23, busbar accurately can be controlled and delivered to electric current, realize the function that multichannel miniwatt power supply to be measured loads simultaneously, adopt the high-power energy feedback module 11 can be simultaneously current control module 9, 10 concentration of energy of sending here are fed back to electrical network, guarantee the stable of busbar voltage, so only adopt the form of a feedback module effectively to reduce costs.
The beneficial effects of the utility model are: due to the power detecting system that has adopted this energy feedback, there is the advantages such as the novel structure volume is little, lightweight, equipment cost is low, can, by the energy feedback more than 90% that became heat exhaustion in the past to electrical network, experimental cost and floor area have greatly been saved.
Claims (4)
1. the interchange 400Hz intermediate frequency power supply test macro with electric energy feedback function, it is characterized in that being provided with test main circuit and test control platform, the test main circuit is comprised of feed-back type electronic load and DC master row, control platform control feed-back type electronic load by test and added the off-load operation, store the parameter of surveying simultaneously, and output test result, simultaneously the feed-back type electronic load again by the electric energy feedback in test process to electrical network, described feed-back type electronic load comprises current regulating module and energy feedback module, current regulating module and energy feedback module are connected in parallel on DC master row, current regulating module is comprised of PWM rectification circuit and filter inductance, by three phase full bridge the electric circuit constitute PWM rectification circuit, form three groups of brachium pontis by six insulated gate bipolar power tube IGBT, the three road PWM trigger pips that power-supply controller of electric sends, be divided into six tunnels after power driver module, thereby the switch on and off that drives respectively 6 IGBT is realized the adjusting of size of current phase place, simultaneously, carry out filtering by filter inductance, the current harmonics of filtering electric current medium-high frequency, the energy feedback module is comprised of PWM inverter circuit and LC filtering circuit, by three phase full bridge the electric circuit constitute PWM inverter circuit, form three groups of brachium pontis by six insulated gate bipolar power tube IGBT, the three road PWM trigger pips that power-supply controller of electric sends, be divided into six tunnels after power driver module, thereby the switch on and off that drives respectively 6 IGBT is realized the feedback grid of energy, DC master row is comprised of three copper bars and DC filter capacitor, the DC voltage that the current regulating module rectification is generated is carried out filtering, described test is controlled platform and is comprised the CPU control module, analog signal detection module, power driver module, demonstration/communication module, analog signal detection module, power driver module and demonstration/communication module are connected to the CPU control module by shielded multiconductor cable respectively, analog signal detection module completes input three-phase voltage and three-phase current, DC master row voltage, the detection of grid-connected three-phase voltage and three-phase current, deliver to the CPU control module by shielded multiconductor cable, the CPU control module is by the A/D sampling A/D chip, analog quantity is changed into to digital quantity, carry out computing by digital signal processor cells D SP on sheet simultaneously, calculate needed real-time detector data, produce control IGBT and open the pwm signal of shutoff, then send to two power driver modules the shutoff of opening that pwm signal is controlled insulated gate bipolar power tube IGBT in rectification circuit and inverter circuit respectively by 16 core cables, demonstration/communication module is by 16 core cables, with the CPU control module, by RS232, use the MODBUS communications protocol to be connected, pass on loading command and relative parameters setting to it, simultaneously, the real-time detector data that will obtain from the CPU control module shows by display screen, and transfer to outside industrial computer by the RS485 communicating circuit and controlled.
2. a kind of interchange 400Hz intermediate frequency power supply test macro with electric energy feedback function according to claim 1, is characterized in that current regulating module adopts the three-phase three-wire system current control module.
3. a kind of interchange 400Hz intermediate frequency power supply test macro with electric energy feedback function according to claim 1, is characterized in that current regulating module adopts the three-phase four-wire system current control module.
4. a kind of interchange 400Hz intermediate frequency power supply test macro with electric energy feedback function according to claim 1, is characterized in that current regulating module can also adopt three-phase three-wire system current control module and three-phase four-wire system current control module to share DC master row.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103091645A (en) * | 2012-12-02 | 2013-05-08 | 威海广泰空港设备股份有限公司 | Alternating current 400 Hz medium frequency power supply test system with electric power feedback function |
| CN103439671A (en) * | 2013-08-23 | 2013-12-11 | 深圳市晶福源电子技术有限公司 | Test system and method used for inverter power supply capable of parallel operation |
| CN103618334A (en) * | 2013-09-11 | 2014-03-05 | 合肥联信电源有限公司 | Electric energy recycling device used for generator and work method of electric energy recycling device |
| CN104133182A (en) * | 2014-08-19 | 2014-11-05 | 威海广泰空港设备股份有限公司 | Test load test device for medium-frequency power source and power-frequency power source |
| CN104362866A (en) * | 2014-11-10 | 2015-02-18 | 纽福克斯光电科技（上海）有限公司 | Inverter device |
| CN105242221A (en) * | 2015-11-17 | 2016-01-13 | 武汉征原电气有限公司 | DC feedback type DC electronic load for locomotive power supply test |
| CN109239622A (en) * | 2018-10-23 | 2019-01-18 | 北京大华无线电仪器有限责任公司 | DC load is set to have the device and control method of exchange load function |
| CN114217547A (en) * | 2021-11-17 | 2022-03-22 | 四川航电微能源有限公司 | Intelligent test platform based on aircraft electrical model |
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2012
- 2012-12-02 CN CN 201220649950 patent/CN202939293U/en not_active Withdrawn - After Issue
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| CN103091645A (en) * | 2012-12-02 | 2013-05-08 | 威海广泰空港设备股份有限公司 | Alternating current 400 Hz medium frequency power supply test system with electric power feedback function |
| CN103091645B (en) * | 2012-12-02 | 2015-12-16 | 威海广泰空港设备股份有限公司 | There is the interchange 400Hz intermediate frequency power supply test macro of electric energy feedback function |
| CN103439671A (en) * | 2013-08-23 | 2013-12-11 | 深圳市晶福源电子技术有限公司 | Test system and method used for inverter power supply capable of parallel operation |
| CN103439671B (en) * | 2013-08-23 | 2016-04-06 | 深圳晶福源科技股份有限公司 | A kind of for can the test macro of inverter of parallel operation and method |
| CN103618334A (en) * | 2013-09-11 | 2014-03-05 | 合肥联信电源有限公司 | Electric energy recycling device used for generator and work method of electric energy recycling device |
| CN104133182A (en) * | 2014-08-19 | 2014-11-05 | 威海广泰空港设备股份有限公司 | Test load test device for medium-frequency power source and power-frequency power source |
| CN104362866A (en) * | 2014-11-10 | 2015-02-18 | 纽福克斯光电科技（上海）有限公司 | Inverter device |
| CN104362866B (en) * | 2014-11-10 | 2019-03-19 | 纽福克斯光电科技（上海）有限公司 | A kind of DC-to-AC converter |
| CN105242221A (en) * | 2015-11-17 | 2016-01-13 | 武汉征原电气有限公司 | DC feedback type DC electronic load for locomotive power supply test |
| CN109239622A (en) * | 2018-10-23 | 2019-01-18 | 北京大华无线电仪器有限责任公司 | DC load is set to have the device and control method of exchange load function |
| CN114217547A (en) * | 2021-11-17 | 2022-03-22 | 四川航电微能源有限公司 | Intelligent test platform based on aircraft electrical model |
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