A digital-analog compatible control electronic load
A digital-analog compatible, electronic load technology, applied in the direction of measuring electricity, measuring electrical variables, improving basic electrical components, etc., can solve problems such as inability to discharge current limit, difficulty in meeting measurement requirements, and inability to adapt to connect to input digital signal sources. , to achieve the effect of convenient use
Inactive Publication Date: 2011-12-14
SHENZHEN RELAT ELECTRONICS TECH
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Problems solved by technology
The defect of this circuit mainly is: high-power discharge needs many tubes to be connected in parallel; Once the semiconductor device Q1 fails, the discharge current cannot be limited; , special discharge waveform and other occasions are difficult to meet the measurement requirements
In addition, some existing commercial electronic loads with digital programming functions can meet the measurement requirements, but they need to comply with certain communication protocols and use data buses
Method used
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[0029] The present invention will be described below in combination with specific embodiments and with reference to the accompanying drawings.
[0030] a kind of like Figure 1~3 The digital-analog compatible control electronic load shown includes N groups of load units with the same or approximately the same circuit structure (N is a positive integer greater than or equal to 2), and each group of load units has its own independent input terminals and mutual The shared output terminals are connected to the electrified body with the mutually shared output terminals.
[0031] The first group of load units includes an active discharge load unit composed of an operational amplifier OP1 cascaded with a bipolar transistor Q1 connected to a follower resistor RS1, and is used to discharge the charged body. The charged body is at least one of a power supply, a battery and a capacitor.
[0032] Among them, the first group of load units is provided with an input circuit composed of an ...
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An electronic load compatible with digital and analog control, including an active discharge load unit composed of an operational amplifier and a cascaded bipolar transistor or MOSFET connected with a follower resistance, used to discharge the charged body, characterized in that: It includes at least one group of load units with identical or approximately identical circuit structures. Each group of load units is provided with its own independent input terminal and an output terminal shared with each other, and the output terminal is connected to the electrified body. Each group of load units is also respectively provided with an input circuit composed of an operational amplifier connected with a negative feedback resistor and a photocoupler connected with an output resistor in cascaded connection. The electronic load of the present invention can be fully or partially adapted to be connected to input digital signal sources or analog signal sources, and can be very flexibly composed of loads with different waveforms, different powers, and different uses. It also has an input and output isolation function, is easy to use, and can be widely used in High voltage, power, electric power, and component testing in the field of energy and experimental instruments.
Description
technical field [0001] The invention relates to an electronic load, in particular to an electronic load with digital-analog compatible control. Background technique [0002] When testing the load characteristics of charged objects, power supplies, batteries, and capacitors, electronic loads are generally required to discharge the charged objects so that experimenters can touch the charged objects and eliminate personal safety issues. The existing electronic loads have simple functions, and most of them belong to the general mode of constant current, constant resistance or constant power, and are widely used such as Figure 4 The electronic load shown, the electronic load consists of the operational amplifier OP 1 and connected with a follower resistor R S1 Bipolar transistor or Metal Oxide Semiconductor Field Effect Transistor (Metal Oxide Semiconductor Field Effect Transistor, abbreviated as MOSFET) Q 1 Cascaded to form an active discharge load, the load is discharged by ...
Claims
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IPC IPC(8): G01R1/20G01R1/28
Inventor 吴刚开
Owner SHENZHEN RELAT ELECTRONICS TECH