CN114594822A - High-power high-precision constant-current electronic load - Google Patents
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Abstract
The invention discloses a high-power high-precision constant-current electronic load. The high-power high-precision constant-current electronic load comprises a constant current error amplifying unit, a power unit group and a summing unit; the first input end of the constant current error amplifying unit is connected with the output end of the summing unit, and the second input end of the constant current error amplifying unit is connected with a constant current control voltage signal; the power unit group comprises n power units which are connected in parallel, and the input end of each power unit is connected with the output end of the constant current error amplifying unit; the output ends of the n power units are respectively connected with the resistors to perform average operation, and then are compared with the set current and accumulated to realize a summing unit. The invention is composed of a plurality of power unit groups, and can realize high power; in each power unit group, the maximum current value is higher, smaller current can be set, and high precision and wide voltage range are realized; each power unit group is internally provided with closed-loop feedback control, so that constant-current closed-loop control can be realized, and the stability and reliability of the electronic load are enhanced.
Description
Technical Field
The invention relates to the technical field of electronic loads, in particular to a high-power high-precision constant-current electronic load.
Background
The electronic load is an instrument with controllable current, voltage and resistance, can simulate a real load, can consume, absorb or bear power and current, is commonly used for testing and evaluating power output equipment such as a high-power resistor, a rechargeable battery, a charger and the like, and generally has the functions of constant current, constant resistance, constant voltage and constant power.
With the development of electronic technology, the performance indexes of various electronic products are gradually improved, and the requirements on the performance indexes of electronic loads are stricter, especially the requirements on constant voltage and constant current are higher and higher. The constant current is used as a common electronic load function, is mainly used for testing various power supplies and batteries, and can also form a constant current source with the power supplies. In addition, the high-current precise constant current source has wide application, such as nuclear magnetic resonance, particle accelerators, ion restriction devices and the like.
The constant current source generally adopts a precise parallel three-end adjustable reference voltage source to replace a voltage stabilizing tube, the output current of the constant current source of the structure is not adjustable, the numerical value is small, the range is narrow, the precision is low, the constant current source and the adjustable resistor form a nonlinear relation, and the main problems in the electronic load technology are that the response speed is slow, the precision is not high, the dynamic load testing function is incomplete and the stability is poor.
In the prior art, in the patent high-precision constant-current numerical control electronic load and the working method thereof, although high precision is realized, the high-precision constant-current numerical control electronic load cannot be used in high-power occasions; although the constant current type high-power electronic load control circuit realizes high power, an additional transistor driving circuit is needed, and additional loss is increased.
How to solve the above problems is a need to be solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a high-power high-precision constant-current electronic load.
The purpose of the invention is realized by at least one of the following technical solutions.
A high-power high-precision constant-current electronic load comprises a constant-current error amplifying unit, a power unit group and a summing unit;
the first input end of the constant current error amplifying unit is connected with the output end of the summing unit, and the second input end of the constant current error amplifying unit is connected with a constant current control voltage signal; the power unit group comprises n power units which are connected in parallel, and the input end of each power unit is connected with the output end of the constant current error amplifying unit; the output ends of the n power units are respectively connected with the resistors to perform average operation, and then are compared with the set current and accumulated to realize a summing unit.
Furthermore, the power unit comprises a first connection port and a second connection port, the first connection port is used for positive output, and the second connection port is used for negative output;
in the power unit group, the first connection ports of the n power units are connected to the output positive wiring column of the power unit group, namely the positive wiring column of the electronic load, and the second connection ports of the n power units are connected to the output negative wiring column of the power unit group, namely the negative wiring column of the electronic load.
Further, the power unit comprises a first operational amplifier, a second operational amplifier, a first resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first transistor, a first capacitor, a second capacitor and a third capacitor;
the first end of the tenth resistor is input with unit programming voltage, and the second end of the tenth resistor is connected with the non-inverting input end of the first operational amplifier and the first end of the first capacitor; the inverting input end of the first operational amplifier is connected with the second end of the ninth resistor, the first end of the eleventh resistor, the first end of the second capacitor and the first end of the third capacitor; the output end of the first operational amplifier is connected with the second end of the eleventh resistor, the second end of the second capacitor and the first end of the first resistor;
the grid electrode of the first transistor is connected with the second end of the first resistor and the first end of the sixth resistor, the source electrode is connected with the second end of the sixth resistor, the first end of the fourth resistor, the first end of the seventh resistor and the second end of the third capacitor, and the drain electrode is connected with the first connection port;
a first end of a fifth resistor and an output end of the second operational amplifier; the non-inverting input end of the second operational amplifier is connected with the second end of the fourth resistor, and the inverting input end of the second operational amplifier is connected with the second end of the third resistor and the first end of the fifth resistor; the second end of the seventh resistor, the first end of the third resistor, the first end of the eighth resistor and the second end of the first capacitor are grounded together, and the second end of the eighth resistor and the second connection port are connected.
Furthermore, in the power unit, the first operational amplifier is used for controlling the first transistor and providing a driving voltage for the first transistor; the second operational amplifier is used for differentially amplifying voltage signals generated by the current output to the seventh resistor by each power unit and outputting the differentially amplified voltage signals to the constant current error amplification unit as feedback; the first transistor is an output tube, current output is realized by switching on or switching off, and actual output current flows out from the first connection port to the second connection port through the first transistor, the seventh resistor and the eighth resistor.
Furthermore, the summing unit comprises n second resistors corresponding to the n power units, wherein a first end of a ninth resistor of the ith power unit is connected with a second end of the ith second resistor, first ends of all the second resistors are connected together to form an averaging circuit, and the sum Isum of the average current of the output power units, i, is 1-n.
Further, the constant current error amplifying unit comprises a third operational amplifier, a fourth capacitor and a first external input power supply;
the non-inverting input end of the third operational amplifier is connected with the positive electrode of the first external input power supply and the unit programming current, the inverting input end of the third operational amplifier is connected with the first ends of all the second resistors and the first ends of all the fourth capacitors, and the output end of the third operational amplifier is connected with the first ends of the tenth resistors in all the power units and the second ends of all the fourth capacitors; the negative electrode of the first external input power supply is grounded;
the summation unit outputs the sum Isum of the average values of the power unit currents to the reverse input end of the third operational amplifier, a set signal, namely the unit programming current input by the non-inverting input end, is compared, and the output end of the third operational amplifier outputs an error signal, namely the unit programming voltage, to the first ends of the tenth resistors in all the power units to form closed-loop control, so that the constant-current closed-loop load characteristic is realized.
Further, the constant current control voltage signal is a unit programming current and a first external input power supply, the output current Isum from the first connection port to the second connection port is equal to the unit programming current, the unit programming current offsets the current provided by the first external input power supply by controlling the unit programming current, the virtual short and virtual disconnection of the third operational amplifier is achieved, namely constant current closed loop control is achieved, the output current Isum from the first connection port to the second connection port is equal to the unit programming current, the unit programming voltage output between the first connection port and the second connection port is equal to the current integral of the fourth capacitor multiplied by the output current Isum, the constant current control voltage signal is achieved, and the unit programming voltage at the moment is controlled by controlling the unit programming current.
Further, when the required output current Isum of the electronic load is aA and the output current of a single power unit is bA, the number n of power units required in the power unit group is a/b.
Further, the first resistance is 10 Ω, the second resistance is 20k Ω, the fifth resistance is 16.35k Ω, the sixth resistance is 100k Ω, the seventh resistance is 10k Ω, the eighth resistance is 0.1M Ω, the ninth resistance is 1M Ω, the tenth resistance is 14.7k Ω, the eleventh resistance is 1M Ω, the first capacitance is 1nF, and the second capacitance is 22 pF; the third resistor is a fourth resistor and has a value range of 63-2 k omega; the output current of the single power unit is 2A-60A.
Further, the first transistor adopts 230W IRFB4410ZPF or 580W high-power IRFPS 3810; the first operational amplifier is MC34071D, the second operational amplifier and the third operational amplifier are AD8551AR or ADA4528, different operational amplifiers are adopted because of the requirements of cost and precision, the second operational amplifier and the third operational amplifier are more expensive because of the requirement of higher precision, the first operational amplifier can use a less-expensive operational amplifier, and the lower-precision operational amplifier can be properly selected.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the constant-current electronic load is composed of a plurality of power unit groups, and high power can be realized;
2. in each power unit group, the maximum current value is higher and can reach 60A, so that smaller current can be set, and high precision and wide voltage range are realized;
3. each power unit group is internally provided with closed-loop feedback control, so that constant-current closed-loop control can be realized, and the stability and reliability of the electronic load are enhanced;
4. the operational amplifiers in the constant-current closed-loop control all adopt a single power supply mode, so that the circuit structure is simplified;
5. the summing unit can be shared in the electronic load and is also used for closed-loop feedback average value summing control, so that the robustness of the electronic load is improved, and the circuit structure is simplified.
Drawings
Fig. 1 is a schematic structural diagram of a constant current electronic load in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a power unit set according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of current accumulation closed-loop control according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1:
a high-power high-precision constant-current electronic load is shown in figure 1 and comprises a constant current error amplifying unit, a power unit group and a summing unit;
the first input end of the constant current error amplifying unit is connected with the output end of the summing unit, and the second input end of the constant current error amplifying unit is connected with a constant current control voltage signal; the power unit group comprises n power units which are connected in parallel, and the input end of each power unit is connected with the output end of the constant current error amplifying unit; the output ends of the n power units are respectively connected with the resistors to perform average operation, and then are compared with the set current and accumulated to realize a summing unit.
As shown in fig. 2, the power unit includes a first connection port P and a second connection port N, where the first connection port P is a positive output and the second connection port N is a negative output;
in the power unit group, the first connection ports P of the N power units are all connected to the output positive wiring column of the power unit group, namely, the positive wiring column of the electronic load, and the second connection ports N of the N power units are all connected to the output negative wiring column of the power unit group, namely, the negative wiring column of the electronic load.
As shown in fig. 2, the power unit includes a first operational amplifier U1, a second operational amplifier U2, a first resistor R1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first transistor Q1, a first capacitor C1, a second capacitor C2, and a third capacitor C3;
a first end of the tenth resistor R10 receives the cell programming voltage Vset, and a second end thereof is connected to the non-inverting input terminal of the first operational amplifier U1 and the first end of the first capacitor C1; an inverting input end of the first operational amplifier U1 is connected with the second end of the ninth resistor R9, the first end of the eleventh resistor R11, the first end of the second capacitor C2 and the first end of the third capacitor C3; the output end of the first operational amplifier U1 is connected with the second end of the eleventh resistor R11, the second end of the second capacitor C2 and the first end of the first resistor R1;
a gate of the first transistor Q1 is connected to the second end of the first resistor R1 and the first end of the sixth resistor R6, a source is connected to the second end of the sixth resistor R6, the first end of the fourth resistor R4, the first end of the seventh resistor R7 and the second end of the third capacitor C3, and a drain is connected to the first connection port P;
a first end of a fifth resistor R5 and an output end of a second operational amplifier U2; the non-inverting input end of the second operational amplifier U2 is connected with the second end of the fourth resistor R4, and the inverting input end is connected with the second end of the third resistor R3 and the first end of the fifth resistor R5; the second end of the seventh resistor R7, the first end of the third resistor R3, the first end of the eighth resistor R8 and the second end of the first capacitor C1 are commonly grounded, and the second end of the eighth resistor R8 and the second connection port N are connected to the ground.
In the power unit, a first operational amplifier U1 is used for controlling a first transistor Q1 and providing a driving voltage for the first transistor Q1; the second operational amplifier U2 is used for differentially amplifying a voltage signal generated by the current output by each power unit to the seventh resistor R7, and outputting the differentially amplified voltage signal to the constant current error amplifying unit as feedback; the first transistor Q1 is an output transistor, and outputs a current by turning on or off, and the actual output current flows out from the first connection port P to the second connection port N through the first transistor Q1, the seventh resistor R7, and the eighth resistor R8.
As shown in fig. 3, the summing unit includes n second resistors corresponding to the n power units, wherein a first end of a ninth resistor R9 of the ith power unit is connected to the ith second resistor R2iAll of the second resistors R2iAre connected together to form an averaging circuit, and the sum of the average values of the output power cell currents Isum, i is 1 to n.
As shown in fig. 3, the constant current error amplifying unit includes a third operational amplifier U3, a fourth capacitor C4, and a first external input power source V1;
the non-inverting input terminal of the third operational amplifier U3 is connected to the positive terminal of the first external input power source V1 and the cell programming current Iset, and the inverting input terminal is connected to all the second resistors R2iAnd the output end of the first terminal of the fourth capacitor C4 is connected with the first terminals of the tenth resistors R10 and the second terminals of the fourth capacitors C4 in all the power units; the negative pole of the first external input power supply V1 is grounded;
the summation unit outputs the sum Isum of the average values of the power unit currents to the reverse input end of the third operational amplifier U3, and compared with a set signal, namely the unit programming current Iset input by the non-inverting input end, the output end of the third operational amplifier U3 outputs an error signal, namely a unit programming voltage Vset, to the first ends of the tenth resistors R10 in all the power units, so that closed-loop control is formed, and the constant-current closed-loop load characteristic is realized.
Further, the constant current control voltage signal is a cell programming current Iset and a first external input power source V1, the output current Isum from the first connection port P to the second connection port N is equal to the cell programming current Iset, the cell programming current Iset cancels the current provided by the first external input power source V1 by controlling the cell programming current Iset, and a virtual short virtual cut of the third operational amplifier U3 is achieved, i.e., a constant current closed loop control is achieved, and the cell programming voltage Vset output between the first connection port P and the second connection port N is equal to a current integral of the fourth capacitor C4 multiplied by the output current Isum by controlling the output current Isum from the first connection port P to the second connection port N to be equal to the cell programming current Iset, thereby achieving the constant current control voltage signal, and the cell programming voltage Vset is controlled by controlling the cell programming current Iset.
In this embodiment, the current detection resistor, i.e., the eighth resistor R8, has a very low resistance of 0.1m Ω, so that power consumption is not increased by a large current, and although the voltage across the eighth resistor R8 is lowered, the overall noise is reduced by using a low-noise operational amplifier;
the first operational amplifier U1 is supplied by a single power supply, so that a negative power supply is omitted, the circuit is simplified, and the first operational amplifier U1 is a single power supply operational amplifier capable of starting to supply power at 3V and can drive a large capacitive load.
The third operational amplifier U3 is a common part of the power cell group as a constant current control, requiring only one control loop. The original cell programming current Iset needs to be connected with the negative input of the inverse amplification operational amplifier, namely virtual ground, to play the current addition function, now the third operational amplifier U3 is not used as an adder, but the second resistor R2 in all the power cells1And comparing the sum Isum of the average values of the output power unit currents after averaging with the unit programming current Iset to realize constant current control.
The principle of the invention is as follows: after the output currents of all the power units connected in parallel are accumulated, the sum Isum of the average value of the output currents is compared with a set signal, namely, the unit programming current Iset input by the non-inverting input end passes through a third operational amplifier U3, so that the constant current error amplification can be realized, namely, Iset is equivalent to a reference value and Isum is equivalent to a feedback value in closed-loop control, after the output currents pass through a third operational amplifier U3, the error between Iset and Isum is smaller and smaller, and finally the Isum is kept consistent with Iset, so that the constant current closed-loop load characteristic is realized; the summing unit has the advantages that the summing unit is formed by the parallel addition of the output currents of all the power units, and due to the parallel connection relationship, the constant current error amplification unit can realize the cross current error amplification effect of each power unit only by one unit without adding a constant current error amplification unit to each power unit.
Example 2:
in this embodiment, a single power unit 30A is a high precision constant current load, the first powerThe resistance R1 is 10 omega, the 1 st second resistance R2120k Ω, the third resistor R3 k Ω, the fourth resistor R4 k Ω, the fifth resistor R5 16.35k Ω, the sixth resistor R6 k Ω, the seventh resistor R7 k Ω, the eighth resistor R8 0.1M Ω, the ninth resistor R9M Ω, the tenth resistor R10 k Ω, the eleventh resistor R11M Ω, the first capacitor C1 nF and the second capacitor C2 pF 22 pF; the current of a single power unit can be adjusted by changing the resistance values of the fourth resistor R4 and the third resistor R3, the current of the single power unit can be changed into any different large-current high-precision electronic loads, the high-current high-precision electronic loads are applied to different current grade examples such as nuclear magnetic resonance, a particle accelerator and an ion constraint device, meanwhile, the model of the first transistor Q1 can also be correspondingly adjusted, and therefore the cost, the volume and the loss are reduced.
Example 3:
the first transistor Q1 adopts IRFPS3810 with high power of 580W, and the voltage withstanding value is 100V, so that the transistor can be suitable for occasions with higher power; the second operational amplifier U2 and the third operational amplifier U3 may use ADA4528 with low noise, and ADA4528 is a low noise self-stabilized zero-operation amplifier to reduce the noise of the electronic load as a whole.
Compared with the existing constant-current electronic load, the high-power high-precision constant-current electronic load is suitable for large-current precision occasions, has the advantages of simple structure, high precision, wide voltage range, strong stability and the like, and is worthy of popularization.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that variations based on the shape and principle of the present invention should be covered within the scope of the present invention.
Claims (10)
1. A high-power high-precision constant-current electronic load is characterized by comprising a constant-current error amplifying unit, a power unit group and a summing unit;
the first input end of the constant current error amplifying unit is connected with the output end of the summing unit, and the second input end of the constant current error amplifying unit is connected with a constant current control voltage signal; the power unit group comprises n power units which are connected in parallel, and the input end of each power unit is connected with the output end of the constant current error amplifying unit; the output ends of the n power units are respectively connected with the resistors to perform average operation, and then are compared with the set current and accumulated to realize a summing unit.
2. A high-power high-precision constant-current electronic load according to claim 1, wherein the power unit comprises a first connection port (P) and a second connection port (N), the first connection port (P) is a positive output, and the second connection port (N) is a negative output;
in the power unit group, first connecting ports (P) of N power units are connected to an output positive wiring column of the power unit group, namely a positive wiring column of an electronic load, and second connecting ports (N) of the N power units are connected to an output negative wiring column of the power unit group, namely a negative wiring column of the electronic load.
3. A high-power high-precision constant-current electronic load according to claim 2, wherein the power unit comprises a first operational amplifier (U1), a second operational amplifier (U2), a first resistor (R1), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), an eleventh resistor (R11), a first transistor (Q1), a first capacitor (C1), a second capacitor (C2) and a third capacitor (C3);
the first end of the tenth resistor (R10) is inputted with a unit programming voltage (Vset), and the second end is connected with the non-inverting input end of the first operational amplifier (U1) and the first end of the first capacitor (C1); the inverting input end of the first operational amplifier (U1) is connected with the second end of the ninth resistor (R9), the first end of the eleventh resistor (R11), the first end of the second capacitor (C2) and the first end of the third capacitor (C3); the output end of the first operational amplifier (U1) is connected with the second end of the eleventh resistor (R11), the second end of the second capacitor (C2) and the first end of the first resistor (R1);
a gate of the first transistor (Q1) is connected with a second end of the first resistor (R1) and a first end of the sixth resistor (R6), a source is connected with a second end of the sixth resistor (R6), a first end of the fourth resistor (R4), a first end of the seventh resistor (R7) and a second end of the third capacitor (C3), and a drain is connected with the first connection port (P);
a first terminal of a fifth resistor (R5) and an output terminal of a second operational amplifier (U2); the non-inverting input end of the second operational amplifier (U2) is connected with the second end of the fourth resistor (R4), and the inverting input end of the second operational amplifier is connected with the second end of the third resistor (R3) and the first end of the fifth resistor (R5); the second end of the seventh resistor (R7), the first end of the third resistor (R3), the first end of the eighth resistor (R8) and the second end of the first capacitor (C1) are commonly grounded, and the second end of the eighth resistor (R8) and the second connection port (N) are connected.
4. A high power and high accuracy constant current electronic load according to claim 3, wherein in the power unit, the first operational amplifier (U1) is used for controlling the first transistor (Q1) and providing a driving voltage for the first transistor (Q1); the second operational amplifier (U2) is used for differentially amplifying a voltage signal generated by the current output to the seventh resistor (R7) by each power unit and outputting the differentially amplified voltage signal to the constant current error amplifying unit as feedback; the first transistor (Q1) is an output transistor, and the output of current is realized by turning on or off, and the actual output current flows out from the first connection port (P) to the second connection port (N) through the first transistor (Q1), the seventh resistor (R7) and the eighth resistor (R8).
5. A high-power high-precision constant-current electronic load according to claim 3, wherein the summing unit comprises n second resistors corresponding to the n power units, wherein the first end of the ninth resistor (R9) of the ith power unit is connected with the ith second resistor (R2)i) All second resistors (R2)i) Are connected together to form an averaging circuit, and the sum of the average values of the output power cell currents Isum, i is 1 to n.
6. A high-power high-precision constant-current electronic load according to any one of claims 1 to 5, wherein the constant-current error amplifying unit comprises a third operational amplifier (U3), a fourth capacitor (C4) and a first external input power supply (V1);
the non-inverting input terminal of the third operational amplifier (U3) is connected with the positive electrode of the first external input power supply (V1) and the unit programming current (Iset), and the inverting input terminal is connected with all the second resistors (R2)i) And a first terminal of a fourth capacitor (C4), an output terminal being connected to a first terminal of a tenth resistor (R10) and a second terminal of a fourth capacitor (C4) in all power cells; the negative pole of the first external input power supply (V1) is grounded;
the summation unit outputs the sum Isum of the average values of the power unit currents to the inverting input end of a third operational amplifier (U3), a set signal, namely a unit programming current (Iset) input by the non-inverting input end is compared, and the output end of the third operational amplifier (U3) outputs an error signal, namely a unit programming voltage (Vset), to the first ends of tenth resistors (R10) in all power units to form closed-loop control, so that the constant-current closed-loop load characteristic is realized.
7. A high power high accuracy constant current electronic load according to claim 6, wherein the constant current control voltage signal is a cell programming current (Iset) and a first external input power supply (V1), the output current (Isum) from the first connection port (P) to the second connection port (N) is equal to the cell programming current (Iset), the cell programming current (Iset) cancels the current supplied by the first external input power supply (V1) by controlling the cell programming current (Iset), a virtual short virtual cut of the third operational amplifier (U3) is realized, i.e. a constant current closed loop control is realized, the cell programming voltage (Vset) outputted between the first connection port (P) and the second connection port (N) is equal to the cell programming current (Iset) by controlling the output current (Isum) from the first connection port (P) to the second connection port (N) to be equal to the current integral of the fourth capacitor (C4) multiplied by the output current Isum, a constant current control voltage signal is implemented when the cell programming voltage (Vset) is controlled by controlling the cell programming current (Iset).
8. A high-power high-precision constant-current electronic load according to claim 6, wherein when the required output current Isum of the electronic load is aA and the output current of a single power unit is bA, the required number of power units in the power unit group is n ═ a/b.
9. A high power high accuracy constant current electronic load according to claim 6, wherein the first resistor (R1) is 10 Ω, and the second resistor (R2)i) 20k Ω, 16.35k Ω for the fifth resistance (R5), 100k Ω for the sixth resistance (R6), 10k Ω for the seventh resistance (R7), 0.1M Ω for the eighth resistance (R8), 1M Ω for the ninth resistance (R9), 14.7k Ω for the tenth resistance (R10), 1nF for the eleventh resistance (R11), 22pF for the first capacitance (C1), 22pF for the second capacitance (C2); the third resistor (R3) is a fourth resistor (R4) and has a value ranging from 63 Ω to 2k Ω; the output current of the single power unit is 2A-60A.
10. A high-power high-precision constant-current electronic load according to claim 6, characterized in that the first transistor (Q1) adopts 230W IRFB4410ZPF or 580W high-power IRFPS 3810; the first operational amplifier (U1) adopts MC34071D, the second operational amplifier (U2) and the third operational amplifier (U3) adopt AD8551AR or ADA4528, different operational amplifiers are adopted because of the requirements of cost and precision, the second operational amplifier (U2) and the third operational amplifier (U3) need to be higher in precision, so that the price is higher, the first operational amplifier (U1) can be used for lower-precision operational amplifiers, and the lower-precision operational amplifiers can be properly selected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210122125.6A CN114594822A (en) | 2022-02-09 | 2022-02-09 | High-power high-precision constant-current electronic load |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202018614U (en) * | 2010-12-31 | 2011-10-26 | 中国电器科学研究院 | High-power high-speed line regulation constant flow source |
| CN108459647A (en) * | 2017-02-22 | 2018-08-28 | 苏州普源精电科技有限公司 | The calibration mistuned circuit and method of electronic load constant current control loop |
| CN108459645A (en) * | 2017-02-22 | 2018-08-28 | 苏州普源精电科技有限公司 | Constant current control loop and electronic load |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202018614U (en) * | 2010-12-31 | 2011-10-26 | 中国电器科学研究院 | High-power high-speed line regulation constant flow source |
| CN108459647A (en) * | 2017-02-22 | 2018-08-28 | 苏州普源精电科技有限公司 | The calibration mistuned circuit and method of electronic load constant current control loop |
| CN108459645A (en) * | 2017-02-22 | 2018-08-28 | 苏州普源精电科技有限公司 | Constant current control loop and electronic load |
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