CN202333836U

CN202333836U - Energy feedback type electronic load system

Info

Publication number: CN202333836U
Application number: CN 201120467551
Authority: CN
Inventors: 李淼; 朱岩; 迟爽; 管晓磊; 黄雪
Original assignee: Harbin Jiuzhou Electric Co Ltd
Current assignee: Harbin Jiuzhou Electric Co Ltd
Priority date: 2011-11-22
Filing date: 2011-11-22
Publication date: 2012-07-11
Anticipated expiration: 2021-11-22

Abstract

The utility model provides a novel energy feedback type electronic load system. Compared with common resistance loads, the working method of the system is to recycle the output energy of a tested power supply on the premise that power experiments and tests tested by a power electronic conversion technology are completed, thus, the energy is saved without generating a lot of heat, and the problem that the environment temperature of a test site is increased is solved. The electronic load does not convert the test power into heat energy, thus a resistance box and a cooling device with large volumes are not required; the installation space is saved, and the environmental noise is reduced. Since the energy feedback mode is adopted, a relatively large power capacity is not necessary for the test site, and the cost of the power supply capacity is reduced. The system provided by the utility model solves the problem that the electronic load wastes a lot of energy, and the system has the characteristics of continuously adjustable load, strong anti-interference performance, low cost, convenience in application, high reliability, energy-saving performance, high efficiency and the like.

Description

The energy feedback type electronic load system

Technical field

The utility model belongs to the power electronics communication technical field, and what be specifically related to is the energy feedback type electronic load system that is used for DC power, communication infrastructure power supply.

Background technology

Along with the development of power electronic technology, the energy feedback type electronic load is a kind of novel electric power electric device that can simulate the actual resistance load characteristic that is used for various power supply delivery tests.The energy feedback type electronic load can be simulated various load characteristics, can be the inexorable trend of current electronic load development with the free of contamination feedback grid of electric energy again.Compare with the conventional, electric-resistance load; Its working method is to utilize the Technics of Power Electronic Conversion technology under the prerequisite of accomplishing measured power experiment and test; Output energy circulation regeneration with tested power supply; Not only practiced thrift the energy but also do not produced great amount of heat, the problem of having avoided test place ambient temperature to raise.This electronic load system will not tested power and change heat energy into, therefore needn't use bulky resistance box and cooling device, practice thrift installing space, reduce environmental noise.Because what adopt is the mode of energy feedback, therefore testing the place needn't be equipped with bigger power supply capacity, has reduced the cost of power supply capacity.

Summary of the invention

The purpose of the utility model is to solve electronic load in use to a large amount of problems of wasting of electric energy; It can obtain high voltage direct current after through the DC/DC conversion with the low voltage and direct current of the DC power supply to be measured output of storage battery class; And this direct current direct inverse become alternating current; Send into the regeneration that electrical network is realized electric energy through transformer then, and with real-time the showing on the foreground of parameters such as the magnitude of current, voltage.

For reaching above-mentioned purpose; The technical scheme of the utility model is following: the energy feedback type electronic load system is by load characteristic analogue unit, DC/DC DC converter; The feedback grid unit is formed; It is characterized in that: the load characteristic analogue unit carries out behind the load simulation current/voltage being input to the DC/DC DC converter according to the output current value of system's setting; The DC/DC DC converter converts low-voltage DC into high voltage direct current and delivers to the feedback grid unit, and the feedback grid unit is to carry out behind the voltage transformation electric energy being fed back to AC network through the outer transformer of native system behind the alternating current with dc inverter; If can satisfy the needed voltage in feedback grid unit through the resulting voltage of load characteristic analogue unit, then the load characteristic analogue unit is directly delivered to the feedback grid unit with current/voltage; When DC/DC DC converter output voltage had satisfied not the needed busbar voltage of feedback grid unit inversion, electronic load system was no longer to the electrical network feedback energy.

The utility model has solved the problem of electronic load to a large amount of wastes of energy, and it is adjustable continuously that this system has load, strong interference immunity, and cost is low, and is easy to use, characteristics such as reliability height, efficient energy-saving.

Description of drawings

Fig. 1 is the utility model system principle diagram, wherein 1, the load characteristic analogue unit, and 2, DC/DC DC converter, 3, feedback grid unit;

Fig. 2 is that the load characteristic analogue unit forms block diagram, wherein 1, phase-shift circuit, and 2, multiplier, 3, current regulator, 4, PWM generator, 5, power amplification circuit;

Fig. 3 is that the DC/DC DC converter forms block diagram, wherein, and 1, controller, 2, PI loop part; 3, MOS drives, 4, the Boost booster circuit, 5, output rectification circuit, 6, sample circuit; 7, protective circuit, 8, temperature sampling circuit, 9, auxiliary power circuit;

Fig. 4 is that the feedback grid unit forms block diagram, wherein 1, controller, the 2, the output current sampling, 3, the guard signal sampling, 4, drive circuit, 5, the busbar voltage sampling, 6, feedback grid output, 7, filtering output, 8, the DC/AC converter, the 9th, the bus input.

Embodiment

According to accompanying drawing the utility model is done further explain below:

Shown in accompanying drawing 1; It comprises load characteristic analogue unit, DC/DC DC converter the energy feedback type electronic load system of this novelty; The feedback grid unit is formed; The load characteristic analogue unit carries out behind the load simulation current/voltage being input to the DC/DC DC converter according to the output current value of system's setting; The DC/DC DC converter converts low-voltage DC into high voltage direct current and delivers to the feedback grid unit, and the feedback grid unit is to carry out behind the voltage transformation electric energy being fed back to AC network through the outer transformer of native system behind the alternating current with dc inverter; If can satisfy the needed voltage in feedback grid unit through the resulting voltage of load characteristic analogue unit, then the load characteristic analogue unit is directly delivered to the feedback grid unit with current/voltage; When DC/DC DC converter output voltage had satisfied not the needed busbar voltage of feedback grid unit inversion, electronic load was no longer to the electrical network feedback energy, and energy back stops, and electronic load quits work, system closedown.

Concrete embodiment:

1, load characteristic simulation: load characteristic analogue unit control system block diagram is as shown in Figure 2; Wherein Pref, Vu and Iu difference finger print are intended power, tested DC power supply output voltage and the tested DC power supply output current of load, and Iuref and Iuf refer to tested electric power outputting current control target and tested electric power outputting current value of feedback respectively.The main purpose of prime PWM rectification is the characteristic of resistive, perception of simulation and capacitive load, and passes to energy feedback unit to energy from tested power supply.For the prime rectification unit, back level rectification unit is equivalent to direct voltage source, has only a controlled quentity controlled variable Iu, and Iu is carried out closed-loop control.Electronic load want to simulate the RLC load characteristic, thereby phase-shift circuit is essential among the figure as the load of tested power supply.Pref is through producing the fictitious load input current with Vu through multiplier after the phase shift; It is tested electric power outputting current; Control target Iuref, feedback current Iuf and Iuref that process PWM generator and power amplification obtain relatively generate the current error value, and error amount is through current regulator and PWM generator; Reach Iu Iuref is followed the tracks of fast, so just realized the analog functuion of load characteristic.

2, DC/DC DC converting: DC/DC DC converter control system block diagram is as shown in Figure 3, is supplied power to controller by auxiliary power circuit, and the sample circuit part is sampled to the current/voltage behind the output circuit rectification circuit; The protective circuit part is to the controller that is sent to of output circuit data in real time; Controller carries out Temperature Treatment to the operating ambient temperature circuit part simultaneously, regulates PI loop part simultaneously, according to PI loop part; Carry out the MOS drives; Output to the Boost booster circuit after the MOS drives, through after boosting, voltage, electric current output to bus after exporting rectification.Wherein temperature sampling circuit is welded on the control board.

3, feedback grid: feedback grid unit control system block diagram is as shown in Figure 4, and controller is sampled to busbar voltage, the given comparison of bus sampled voltage and bus; Through the PI demodulator, the synchronized signal is multiply by in adjuster output relatively, is comparing with the current inner loop sampling; Process pi regulator relatively; Adjuster output is compared with the carrier wave triangular wave, relatively afterwards through the driving circuit drives device for power switching, feeds back to electrical network after the filtering output.Wherein when the energy feedback type electronic load was worked, to bus and output voltage, real-time current was sampled, and protects, and guarantees man-machine safety.The inversion drive part adopts the unipolarity modulation of regular sampling, it is characterized in that the pipe driving frequency is 50Hz, and following pipe driving frequency is 20KHz.

Claims

1. energy feedback type electronic load system; Be by load characteristic analogue unit, DC/DC DC converter; The feedback grid unit is formed; It is characterized in that: the load characteristic analogue unit carries out behind the load simulation current/voltage being input to the DC/DC DC converter according to the output current value of system's setting; The DC/DC DC converter converts low-voltage DC into high voltage direct current and delivers to the feedback grid unit, and the feedback grid unit is to carry out behind the voltage transformation electric energy being fed back to AC network through the outer transformer of native system behind the alternating current with dc inverter; If can satisfy the needed voltage in feedback grid unit through the resulting voltage of load characteristic analogue unit, then the load characteristic analogue unit is directly delivered to the feedback grid unit with current/voltage; When DC/DC DC converter output voltage had satisfied not the needed busbar voltage of feedback grid unit inversion, electronic load was no longer to the electrical network feedback energy.