电子负载解释（Electronic load interpretation）
Electronic load.Txt12 missing is a poem to let you in ordinary days to read out the rhythm; missing is a shower, let you dry up the moist days; missing is a sun, so that your days of gloomy clear up. Electronic load
The basic working mode of electronic load (CC/CV) is that electronic load plays an important role in the design and production of power products. However, it still seems to be in a mysterious veil until now. The following example allows you to have a preliminary understanding of the electronic load; the constant current control of the 1. electronic load (Chinese Name: constant current mode; CC-Constant Current mode).. The core of the circuit is a current sampling negative feedback control loop, where the transistor Q1 (2N3055) is used as the controller of the current as well as the load of the measured power. Q2 transistor (BC337) is driven by Q1 tube; resistance R1 is current voltage conversion element (I/V, converter) falls on R1 voltage drop through the voltage comparator IC1 with reference (Verf), Q2 Q1, on and off, so as to achieve the purpose of keeping current constant. 2. constant voltage control of electronic load (Chinese Name: fixed voltage mode; English Name: CC-Constant Voltage mode). The principle of the circuit is shown below. The circuit principle of the constant voltage mode is basically the same as the current control.
Programmable power - electronic load can simulate the load in real environment (electrical appliance), generally more stringent requirements on the power supply manufacturers will use electronic load to detect the power supply. It has many functions, can adjust the load size, as well as short-circuit,
over-current, dynamic, etc., should say that all power suppliers will be useful, but also must have.
The principle of electronic load is within the guide flux control power MOSFET or transistor (the amount of duty ratio size), consumption power equipment power dissipation by power tube, it can accurately detect the load voltage, load current and accurate adjustment, can realize the simulation of load short circuit, analog load is inductive resistive and capacitive and the capacitive load current rise time. General switching power supply commissioning testing is indispensable.
Electronic loads can simulate loads in real environments (appliances). It is a constant current, constant resistance, constant pressure and constant power function, and short circuit, over-current, dynamic and so on, it should be said that the power supply manufacturers all will be useful, but also must have. The electronic load is divided into DC electronic load and AC electronic load. Because of the application of electronic load, this paper mainly introduces the DC electronic load.
The market common DC electronic load: several American Agilent, CHROMA of Taiwan and prodigit as
well as domestic has a military background and the bright younger generation Aino Faith Taco. Electronic load is generally divided into monomer electronic load and multi body electronic load, and the monomer electronic load is more convenient, less functional, small volume, but the overall performance is lower than the multi body electronic load. We take many body electron representative load as an example, selects the representative products of various
manufacturers: Agilent N3300A series, CHROMA63100 series, 3310D series and prodigit faith Tektronix FT6600A series for example to illustrate the selection of electronic load.
I. Basic choice.
1. selection of voltage, current, and power
The electronic load is selected according to the output characteristics of the device to be measured: voltage, current, power, and test requirements accuracy. The module of electronic load can only work alone or parallel in testing, and series connection is dangerous for module. So the ideal state is that all requirements are within the range of the single mode set, and then the type selection can be achieved by parallel connection of multiple modules. That is to say, the voltage of the selected module must be consistent with the test requirements. A single module or full installed box (Agilent, 6 grams of fee star
module, CHROMA, Bo 4) the sum of current and power to meet the test requirements.
2. choice of accuracy and resolution
Accuracy and resolution are important parameters of electronic load.
The accuracy of the electronic load varies depending on the significance of the method.
1%+2d 1% measurements + 2 times the minimum display value
1%+2%FS:1% measurements + 1% Man Liangcheng
1%OF:1% (full scale + measurement)
For example, faith Tektronix 60V60A300W electronic load constant current accuracy is 0.1%+5mA, the same prodigit module is 0.2%OF, the conversion is 0.2%+120mA, so don't just look at the nominal accuracy compared to that after conversion to higher accuracy.
Resolution: the minimum amount of external variation in which an instrument can reflect external changes. For example, the resolution of CHROMA electronic load is 0.25mA, and the resolution of electronic load is 0.1mA,
Two. Function choice.
1. basic function selection
The electronic load on the market has four basic functions: constant current, constant voltage, constant resistance and constant power (Agilent has no constant power). In the basic function of the same, the accuracy is not the case, how to determine whether it meets the requirements? The electronic load of CHROMA and meter has only one set of working circuit, that is constant current function. Other functions are calculated according to Ohm's law, although the nominal has other functions, but the actual situation is only constant flow function, by regulating the current to achieve other functions. This saves the cost, but leaves behind other functions, low work accuracy, and unstable work. The word circulating within them
is that there is no limit to the error of the constant resistance function. Test completion depends on the quality of the power, the external environment and the luck. All functions of Agilent and electronic load are realized by different circuits, which can completely fulfill all the limit indexes of the nominal and carry the load stably.
If the constant current function is used and the other functions are not required, the appropriate electro
nic load can be chosen. If the other functional requirements can be stabilized with load, we should consider this problem.
2. dynamic loading
Dynamic loading is the change of electronic load, which is also called transient. Several important parameters:
Slope of change: Generally speaking, the rate at which an electronic load can be completed is, exactly, the rate of change from 10% to 90% of the change in the amount of electronic load. The unit in constant flow is A/mS, A/uS.
Response time: the minimum time that an electronic load can accomplish a change. Unit uS.
The dynamic (transient) frequency of the electronic load is divided into two kinds:
electronic去掉ic是什么
The dynamic frequency (containing only one rising edge or a falling edge, or the number of times per unit time), the transient frequency (a cycle contains the rising edge + the

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