CN212083572U - Electronic load device and electronic load circuit - Google Patents
Electronic load device and electronic load circuit Download PDFInfo
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- CN212083572U CN212083572U CN202020414797.0U CN202020414797U CN212083572U CN 212083572 U CN212083572 U CN 212083572U CN 202020414797 U CN202020414797 U CN 202020414797U CN 212083572 U CN212083572 U CN 212083572U
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Abstract
The utility model belongs to the technical field of the test, a electron load device and electron load circuit are provided. The embodiment of the utility model provides a through providing an electronic load circuit including the first waveform control converting unit, the high frequency isolation two-way power converter and the second waveform control converting unit of electricity connection in proper order, make first waveform control converting unit and equipment under test and the control unit electricity be connected, make the high frequency keep apart two-way power converter and the control unit electricity is connected, make second waveform control converting unit and electric wire netting and the control unit electricity is connected, can realize power two-way flow and to equipment under test's active power and reactive power control under the control of control unit, small, with low costs, efficient and can satisfy the equipment under test's that needs four-quadrant work test demand.
Description
Technical Field
The utility model belongs to the technical field of the test, especially, relate to an electronic load device and electronic load circuit.
Background
Before equipment such as a UPS (uninterruptible Power Supply), a frequency converter, a photovoltaic inverter, an energy storage converter, and an electric vehicle driver is shipped, an aging test is usually performed. The traditional aging test system generally comprises a motor with a power grade suitable for tested equipment, electric energy output by the tested equipment is consumed by the motor, the size is large, the cost is high, the feedback efficiency is low, different tested equipment needs to be provided with different motors in a matching way, the requirement on testers is high, an accident is easily caused by error, and the working efficiency is low. In addition, due to the adoption of the aging test system based on the power frequency transformer, the use of the power frequency transformer limits the space for improving the size, the cost and the feedback efficiency of the aging test system. And an aging test system based on the cascade connection of an isolated AC (Alternating Current)/DC (Direct Current) converter and an inverter cannot meet the test requirement of the tested equipment needing four-quadrant operation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an electronic load device and electronic load circuit, small, with low costs, efficient and can satisfy the test demand that needs four-quadrant work equipment under test.
A first aspect of an embodiment of the present invention provides an electronic load circuit, including a first waveform control conversion unit, a high-frequency isolation bidirectional power converter, and a second waveform control conversion unit, which are electrically connected in sequence;
the first waveform control conversion unit is used for being electrically connected with a tested device and a control unit, filtering a first alternating current signal output by the tested device, changing a current waveform of the first alternating current signal and an included angle between a voltage waveform and a current waveform of the first alternating current signal under the control of the control unit, converting the first alternating current signal into a first direct current signal and outputting the first direct current signal to the high-frequency isolation bidirectional power converter;
the high-frequency isolation bidirectional power converter is electrically connected with the control unit, changes the voltage of the first direct current signal under the control of the control unit and outputs the voltage to the second waveform control conversion unit;
the second waveform control conversion unit is used for being electrically connected with a power grid and the control unit, converting the first direct current signal into a second alternating current signal under the control of the control unit, filtering the second alternating current signal and outputting the second alternating current signal to the power grid; the high-frequency isolation bidirectional power converter is also used for filtering a third alternating current signal output by the power grid, converting the third alternating current signal into a second direct current signal under the control of the control unit and outputting the second direct current signal to the high-frequency isolation bidirectional power converter to realize bidirectional power flow;
the high-frequency isolation bidirectional power converter is also used for changing the voltage of the second direct-current signal under the control of the control unit and outputting the voltage to the first waveform control conversion unit;
the first waveform control conversion unit is also used for converting the second direct current signal into a fourth alternating current signal under the control of the control unit, changing the current waveform of the fourth alternating current signal and the included angle between the voltage waveform and the current waveform of the fourth alternating current signal, filtering the fourth alternating current signal and outputting the filtered fourth alternating current signal to the tested equipment, and realizing bidirectional power flow and active power and reactive power control of the tested equipment.
In one embodiment, the first waveform control conversion unit includes a first filter network and a first totem-pole network;
the first filter network is electrically connected with the first totem-pole network, and the first totem-pole network is electrically connected with the high-frequency isolation bidirectional power converter;
the first filter network is used for being electrically connected with the tested equipment, filtering a first alternating current signal output by the tested equipment and outputting the filtered first alternating current signal to the first totem-pole network;
the first totem-pole network is used for being electrically connected with the control unit, changing the current waveform of the first alternating current signal and the included angle between the voltage waveform and the current waveform of the first alternating current signal under the control of the control unit, converting the first alternating current signal into a first direct current signal and outputting the first direct current signal to the high-frequency isolation bidirectional power converter; the second direct current signal is converted into a fourth alternating current signal under the control of the control unit, the current waveform of the fourth alternating current signal and the included angle between the voltage waveform and the current waveform of the fourth alternating current signal are changed, and the fourth alternating current signal and the included angle are output to the first filter network;
and the first filter network is also used for filtering the fourth alternating current signal and outputting the fourth alternating current signal to the tested equipment.
In one embodiment, the first filter network comprises a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a first capacitor, a second capacitor, and a third capacitor;
one end of each of the first inductor, the second inductor and the third inductor is used for being electrically connected with the tested device; the other ends of the first inductor, the second inductor and the third inductor are respectively electrically connected with one ends of the fourth inductor to the sixth inductor in a one-to-one correspondence manner;
the other ends of the fourth inductor, the fifth inductor and the sixth inductor respectively form a first connecting end, a second connecting end and a third connecting end of the first filter network, and the other ends of the fourth inductor, the fifth inductor and the sixth inductor are respectively and correspondingly electrically connected with the first connecting end, the second connecting end and the third connecting end of the first totem-pole network one by one;
one end of the first capacitor is electrically connected with the other end of the first inductor and one end of the fourth inductor, and the other end of the first capacitor is electrically connected with the other end of the second inductor and one end of the fifth inductor;
one end of the second capacitor is electrically connected with the other end of the third inductor and one end of the fifth inductor, and the other end of the second capacitor is electrically connected with the other end of the third inductor and one end of the sixth inductor;
one end of the third capacitor is electrically connected to the other end of the first inductor and one end of the fourth inductor, and the other end of the third capacitor is electrically connected to the other end of the third inductor and one end of the sixth inductor.
In one embodiment, the first totem-pole network comprises a first electronic switching tube, a second electronic switching tube, a third electronic switching tube, a fourth electronic switching tube, a fifth electronic switching tube and a sixth electronic switching tube;
the output end of the first electronic switching tube and the input end of the second electronic switching tube are electrically connected to form a first connection end of the first totem-pole network, and the first connection end of the first totem-pole network is electrically connected with the first connection end of the first filter network;
the output end of the third electronic switching tube and the input end of the fourth electronic switching tube are electrically connected to form a second connecting end of the first totem-pole network, and the second connecting end of the first totem-pole network is electrically connected with the second connecting end of the first filter network;
the output end of the fifth electronic switching tube and the input end of the sixth electronic switching tube are electrically connected to form a third connecting end of the first totem-pole network, and the third connecting end of the first totem-pole network is electrically connected with the third connecting end of the first filter network;
the input ends of the first electronic switching tube, the third electronic switching tube and the fifth electronic switching tube are electrically connected to form a first connection end of the first waveform control conversion unit, and the first connection end is used for being electrically connected with a first connection end of the high-frequency isolation bidirectional power converter;
and the output ends of the second electronic switching tube, the fourth electronic switching tube and the sixth electronic switching tube are electrically connected to form a second connecting end of the first waveform control conversion unit, and the second connecting end is electrically connected with a second connecting end of the high-frequency isolation bidirectional power converter.
In one embodiment, the high frequency isolated bidirectional power converter includes a first conversion circuit, a second conversion circuit, and a high frequency transformer;
the first converting circuit is electrically connected with the first waveform control converting unit and the primary side of the high-frequency transformer, and the second converting circuit is electrically connected with the secondary side of the high-frequency transformer and the second waveform control converting unit;
the first conversion circuit is electrically connected with the control unit, and is used for chopping the first direct current signal and outputting the chopped first direct current signal to the primary side of the high-frequency transformer;
the high-frequency transformer is used for changing the voltage of the first direct current signal and outputting the voltage to the second conversion circuit;
the second conversion circuit is electrically connected with the control unit, and is used for chopping the first direct current signal and outputting the chopped first direct current signal to the second waveform control conversion unit; the second direct current signal is chopped and then output to a secondary side of the high-frequency transformer;
the high-frequency transformer is also used for changing the voltage of the second direct current signal and outputting the second direct current signal to the first conversion circuit;
the first conversion circuit is further configured to chop the second direct current signal and output the chopped second direct current signal to the first waveform control conversion unit.
In one embodiment, the first conversion circuit and the second conversion circuit are a full bridge circuit, a half bridge circuit, a push-pull circuit, or a flyback circuit.
In one embodiment, the second waveform control conversion unit includes a second filter network and a second totem-pole network;
the second filter network is electrically connected with the second totem-pole network, and the second totem-pole network is electrically connected with the high-frequency isolation bidirectional power converter;
the second totem-pole network is used for being electrically connected with the control unit, converting the first direct current signal into a second alternating current signal under the control of the control unit and outputting the second alternating current signal to the second filter network;
the second filter network is used for being electrically connected with the power grid, filtering the second alternating current signal and outputting the second alternating current signal to the power grid; the second totem pole network is also used for filtering a third alternating current signal output by the power grid and outputting the third alternating current signal to the second totem pole network;
the second totem-pole network is further used for converting the third alternating current signal into a second direct current signal under the control of the control unit and outputting the second direct current signal to the high-frequency isolation bidirectional power converter.
In one embodiment, the second filter network comprises a seventh inductor, an eighth inductor, a ninth inductor, a sixth capacitor, a seventh capacitor, and an eighth capacitor;
one end of each of the seventh inductor, the eighth inductor and the ninth inductor is used for being electrically connected with the power grid;
the other ends of the seventh inductor, the eighth inductor and the ninth inductor respectively form a first connecting end, a second connecting end and a third connecting end of the second filter network, and the seventh inductor, the eighth inductor and the ninth inductor are used for being electrically connected with the first connecting end, the second connecting end and the third connecting end of the second totem-pole network in a one-to-one correspondence manner;
the sixth capacitor is electrically connected between one end of the seventh inductor and one end of the eighth inductor;
the seventh capacitor is electrically connected between one end of the eighth inductor and one end of the ninth inductor;
the eighth capacitor is electrically connected between one end of the seventh inductor and one end of the ninth inductor.
In one embodiment, the second totem-pole network comprises a fifteenth electronic switching tube, a sixteenth electronic switching tube, a seventeenth electronic switching tube, an eighteenth electronic switching tube, a nineteenth electronic switching tube, and a twentieth electronic switching tube;
the output end of the nineteenth electronic switching tube and the input end of the twentieth electronic switching tube are electrically connected to form a first connection end of the second totem-pole network, and the first connection end of the second totem-pole network is electrically connected with the first connection end of the second filter network;
the output end of the seventeenth electronic switching tube and the input end of the eighteenth electronic switching tube are electrically connected to form a second connecting end of the second totem-pole network, and the second connecting end of the second totem-pole network is electrically connected with a second connecting end of the second filter network;
the output end of the fifteenth electronic switching tube and the input end of the sixteenth electronic switching tube are electrically connected to form a third connecting end of the second totem-pole network, and the third connecting end of the second totem-pole network is electrically connected with the third connecting end of the second filter network;
the input ends of the fifteenth electronic switching tube, the seventeenth electronic switching tube and the nineteenth electronic switching tube are electrically connected to form a first connection end of the second waveform control conversion unit, and the first connection end is used for being electrically connected with a third connection end of the high-frequency isolation bidirectional power converter;
and the output ends of the sixteenth electronic switching tube, the eighteenth electronic switching tube and the twentieth electronic switching tube are electrically connected to form a second connecting end of the second waveform control conversion unit, and the second connecting end is electrically connected with a fourth connecting end of the high-frequency isolation bidirectional power converter.
The embodiment of the utility model provides a second aspect provides an electronic load device, include the control unit and if the utility model discloses the first aspect of the embodiment electronic load circuit for test equipment.
The embodiment of the utility model provides a through providing an electronic load circuit including the first waveform control converting unit, the high frequency isolation two-way power converter and the second waveform control converting unit of electricity connection in proper order, make first waveform control converting unit and equipment under test and the control unit electricity be connected, make the high frequency keep apart two-way power converter and the control unit electricity is connected, make second waveform control converting unit and electric wire netting and the control unit electricity is connected, can realize power two-way flow and to equipment under test's active power and reactive power control under the control of control unit, small, with low costs, efficient and can satisfy the equipment under test's that needs four-quadrant work test demand.
Drawings
Fig. 1 is a schematic diagram of a first structure of an electronic load circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a second structure of an electronic load circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a third structure of an electronic load circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a dual active converter according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a bidirectional series resonant converter according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a first structure of a bidirectional LLC resonant converter provided in the embodiment of the present invention;
fig. 7 is a second schematic structural diagram of a bidirectional LLC resonant converter provided in the embodiment of the present invention.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
As shown in fig. 1, an embodiment of the present invention provides an electronic load circuit 100, which includes a first waveform control conversion unit 1, a high-frequency isolation bidirectional power converter 2, and a second waveform control conversion unit 3, which are electrically connected in sequence;
the first waveform control conversion unit 1 is used for being electrically connected with the tested device 200 and the control unit 300, filtering a first alternating current signal output by the tested device 200, changing a current waveform of the first alternating current signal and an included angle between a voltage waveform and the current waveform of the first alternating current signal under the control of the control unit 300, converting the first alternating current signal into a first direct current signal, and outputting the first direct current signal to the high-frequency isolation bidirectional power converter 2;
the high-frequency isolation bidirectional power converter 2 is electrically connected with the control unit 300, changes the voltage of the first direct current signal under the control of the control unit 300, and outputs the voltage to the second waveform control conversion unit 3;
the second waveform control conversion unit 3 is used for being electrically connected with the power grid 400 and the control unit 300, converting the first direct current signal into a second alternating current signal under the control of the control unit 300, filtering the second alternating current signal and outputting the second alternating current signal to the power grid 400; the power grid 400 is used for filtering a third alternating current signal output by the power grid, converting the third alternating current signal into a second direct current signal under the control of the control unit 300, and outputting the second direct current signal to the high-frequency isolation bidirectional power converter 2 to realize bidirectional power flow;
the high-frequency isolation bidirectional power converter 2 is further configured to change a voltage of the second direct-current signal under the control of the control unit 300 and output the voltage to the first waveform control conversion unit 1;
the first waveform control conversion unit 1 is further configured to convert the second dc electrical signal into a fourth ac electrical signal under the control of the control unit 300, change a current waveform of the fourth ac electrical signal and an included angle between a voltage waveform and a current waveform of the fourth ac electrical signal, filter the fourth ac electrical signal, and output the filtered fourth ac electrical signal to the device under test 200, thereby realizing bidirectional power flow and active power and reactive power control on the device under test 200.
In application, the tested device can be a UPS, a frequency converter, a photovoltaic inverter, an energy storage converter, an electric vehicle driver and the like. The grid may be a utility grid or a power frequency grid. The working power supply of the tested device and the frequency and voltage amplitude of the power grid can be set according to actual needs. The electronic load circuit can adapt to the tested equipment and the power grid with any frequency and voltage amplitude.
In Application, the control Unit has functions of voltage sampling, current sampling and logic operation, and may be an Integrated Circuit, a chip or a device formed by integrating a voltage sampling Circuit, a current sampling Circuit and a logic operation Circuit, and the control Unit may specifically be a Central Processing Unit (CPU), or may also be other general purpose processors, Digital Signal Processors (DSP), Application Specific Integrated Circuits (ASIC), ready-made Programmable Gate arrays (FPGA), other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The control unit can adaptively adjust the frequency and the voltage amplitude of the second alternating current signal and the fourth alternating current signal output by the electronic load circuit according to the actual requirements of the frequency and the voltage amplitude of the tested device and the power grid.
In application, the first waveform control conversion unit, the high-frequency isolation bidirectional power converter and the second waveform control conversion unit can be realized by selecting circuits, chips or devices with corresponding functions according to actual needs.
As shown in fig. 2, in one embodiment, the first waveform control conversion unit 1 includes a first filter network 11 and a first totem-pole network 12;
the first filter network 11 is electrically connected with the first totem-pole network 12, and the first totem-pole network 12 is electrically connected with the high-frequency isolation bidirectional power converter 2;
the first filter network 11 is used for being electrically connected with the device under test 200, and filtering the first alternating current signal output by the device under test 200 and outputting the filtered first alternating current signal to the first totem-pole network 12;
the first totem-pole network 12 is used for being electrically connected with the control unit 300, changing the current waveform of the first alternating current signal and the voltage waveform and the included angle of the current waveform of the first alternating current signal under the control of the control unit 300, converting the first alternating current signal into a first direct current signal and outputting the first direct current signal to the high-frequency isolation bidirectional power converter 2; the second dc signal is further used for converting the second dc signal into a fourth ac signal under the control of the control unit 300, changing a current waveform of the fourth ac signal and an included angle between a voltage waveform and a current waveform of the fourth ac signal, and outputting the changed current waveform to the first filter network 11;
the first filter network 11 is further configured to filter the fourth ac signal and output the fourth ac signal to the device under test 200.
In application, the first filter network may be implemented by selecting a filter network, a chip or a device having a corresponding function according to actual needs, for example, an LC filter network, a CLC filter network, an LCL filter network, and the like.
As shown in fig. 3, in one embodiment, the first filter network 11 includes a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, a fifth inductor L5, a sixth inductor L6, a first capacitor C1, a second capacitor C2, and a third capacitor C3;
one ends of the first inductor L1, the second inductor L2 and the third inductor L3 are respectively used for electrically connecting with the device under test 200; the other ends of the first inductor L1, the second inductor L2 and the third inductor L3 are electrically connected with one ends of the fourth inductor L4 to the sixth inductor L6 in a one-to-one correspondence;
the other ends of the fourth inductor L4, the fifth inductor L5 and the sixth inductor L6 respectively form a first connection end, a second connection end and a third connection end of the first filter network 11, and are respectively and correspondingly electrically connected with the first connection end, the second connection end and the third connection end of the first totem-pole network 12;
one end of a first capacitor C1 is electrically connected to the other end of the first inductor L1 and one end of the fourth inductor L4, and the other end of the first capacitor C1 is electrically connected to the other end of the second inductor L2 and one end of the fifth inductor L5;
one end of a second capacitor C2 is electrically connected to the other end of the third inductor L3 and one end of the fifth inductor L5, and the other end of the second capacitor C2 is electrically connected to the other end of the third inductor L3 and one end of the sixth inductor L6;
one end of the third capacitor C3 is electrically connected to the other end of the first inductor L1 and one end of the fourth inductor L4, and the other end of the third capacitor C3 is electrically connected to the other end of the third inductor L3 and one end of the sixth inductor L6.
In application, each inductor in the first filter network may be implemented by one high frequency inductor or by at least two high frequency inductors in series. Each capacitor in the first filter network is a non-polar capacitor.
In application, the first totem-pole network can be realized by selecting circuits, chips or devices with corresponding functions according to actual needs.
As shown in fig. 3, in one embodiment, the first totem-pole network 12 includes a first electronic switch Q1, a second electronic switch Q2, a third electronic switch Q3, a fourth electronic switch Q4, a fifth electronic switch Q5, and a sixth electronic switch Q6;
the output end of the first electronic switching tube Q1 and the input end of the second electronic switching tube Q2 are electrically connected to form a first connection end of the first totem pole network 12, and are used for being electrically connected with the first connection end of the first filter network 11;
the output end of the third electronic switching tube Q3 and the input end of the fourth electronic switching tube Q4 are electrically connected to form a second connection end of the first totem-pole network 12, and are used for being electrically connected with the second connection end of the first filter network 11;
the output end of the fifth electronic switching tube Q5 and the input end of the sixth electronic switching tube Q6 are electrically connected to form a third connection end of the first totem-pole network 12, and are used for being electrically connected with the third connection end of the first filter network 11;
the input ends of the first electronic switching tube Q1, the third electronic switching tube Q3 and the fifth electronic switching tube Q5 are electrically connected to form a first connection end of the first waveform control conversion unit 1, and the first connection end is used for being electrically connected with a first connection end of the high-frequency isolation bidirectional power converter 2;
the output ends of the second electronic switch tube Q2, the fourth electronic switch tube Q4 and the sixth electronic switch tube Q6 are electrically connected to form a second connection end of the first waveform control conversion unit 1, and are used for being electrically connected with a second connection end of the high-frequency isolation bidirectional power converter 2.
In application, each electronic switch tube in the first totem-pole network can be realized by selecting a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or an Insulated Gate Bipolar Transistor (IGBT) according to actual needs, and the channel type of the electronic switch tube is selected according to actual needs.
As shown in fig. 3, the first electronic switching tube Q1, the second electronic switching tube Q2, the third electronic switching tube Q3, the fourth electronic switching tube Q4, the fifth electronic switching tube Q5 and the sixth electronic switching tube Q6 are exemplarily shown to be P-channel enhancement MOSFETs; the drains of the first electronic switching tube Q1, the second electronic switching tube Q2, the third electronic switching tube Q3, the fourth electronic switching tube Q4, the fifth electronic switching tube Q5 and the sixth electronic switching tube Q6 are used as input ends, and the source is used as an output end.
As shown in fig. 2, in one embodiment, the high frequency isolated bidirectional power converter 2 includes a first converting circuit 21, a second converting circuit 22, and a high frequency transformer 23 (labeled as T1 in fig. 3-7);
the first converting circuit 21 is electrically connected with the first waveform control converting unit 1 and the primary side of the high-frequency transformer 23, and the second converting circuit 22 is electrically connected with the secondary side of the high-frequency transformer 23 and the second waveform control converting unit 3;
the first converting circuit 21 is electrically connected to the control unit 300, and is configured to chop the first dc signal and output the chopped dc signal to the primary side of the high-frequency transformer 23;
the high-frequency transformer 23 is used for changing the voltage of the first direct current signal and outputting the first direct current signal to the second conversion circuit 22;
the second converting circuit 22 is electrically connected to the control unit 300, and is configured to chop the first dc signal and output the chopped first dc signal to the second waveform control converting unit 3; the second direct current signal is also used for chopping and then is output to a secondary side of the high-frequency transformer 23;
the high-frequency transformer 23 is further configured to change a voltage of the second direct-current signal and output the second direct-current signal to the first conversion circuit 21;
the first converting circuit 21 is further configured to chop the second dc signal and output the second dc signal to the first waveform control converting unit 1.
In application, the first conversion circuit and the second conversion circuit can be realized by selecting circuits, chips or devices with corresponding functions according to actual needs. The ratio of the primary side direct current bus voltage and the secondary side direct current bus voltage of the high-frequency transformer is equal to the ratio of the number of turns of the primary side winding of the high-frequency transformer to the number of turns of the secondary side winding of the high-frequency transformer.
In one embodiment, the first and second conversion circuits are full bridge circuits, half bridge circuits, push-pull circuits, or fly-back circuits.
As shown in any one of fig. 3 to 7, the configuration of the first inverter circuit 21 and the second inverter circuit 22 is exemplarily shown when the first inverter circuit 21 and the second inverter circuit 22 are full-bridge circuits;
the first conversion circuit 21 comprises a seventh electronic switching tube Q7, an eighth electronic switching tube Q8, a ninth electronic switching tube Q9, a tenth electronic switching tube Q10 and a fourth capacitor C4, and the second conversion circuit 22 comprises an eleventh electronic switching tube Q11, a twelfth electronic switching tube Q12, a thirteenth electronic switching tube Q13, a fourteenth electronic switching tube Q14 and a fifth capacitor C5;
the output ends of the seventh electronic switching tube Q7 and the eighth electronic switching tube Q8 are electrically connected to form a first connection end of the first conversion circuit 21, and are used for being electrically connected with one end of the primary side of the high-frequency transformer T1;
the output ends of the ninth electronic switching tube Q9 and the tenth electronic switching tube Q10 are electrically connected to form a second connection end of the first converting circuit 21, and are used for being electrically connected with the other end of the primary side of the high-frequency transformer T1;
the input end of the seventh electronic switching tube Q7, the input end of the ninth electronic switching tube Q9 and one end of the fourth capacitor C4 are electrically connected to form a first connection end of the high-frequency isolated bidirectional power converter 2, which is used for being electrically connected with the first connection end of the first waveform control conversion unit 1;
the output end of the eighth electronic switch tube Q8, the output end of the ninth electronic switch tube Q9 and the other end of the fourth capacitor C4 are electrically connected to form a second connection end of the high-frequency isolated bidirectional power converter 2, and the second connection end is electrically connected with the second connection end of the first waveform control conversion unit 1;
the output ends of the eleventh electronic switch tube Q11 and the twelfth electronic switch tube Q12 are electrically connected to form a first connection end of the second conversion circuit 22, and are used for being electrically connected with one end of the secondary side of the high-frequency transformer T1;
the output ends of the thirteenth electronic switch tube Q13 and the fourteenth electronic switch tube Q14 are electrically connected to form a second connection end of the second converting circuit 22, and are used for being electrically connected with the other end of the secondary side of the high-frequency transformer T1;
the input end of the eleventh electronic switch tube Q11, the input end of the thirteenth electronic switch tube Q13 and one end of the fifth capacitor C5 are electrically connected to form a third connection end of the high-frequency isolated bidirectional power converter 2, and are used for being electrically connected with the first connection end of the second waveform control conversion unit 3;
the output end of the twelfth electronic switch tube Q12, the output end of the fourteenth electronic switch tube Q14 and the other end of the fifth capacitor C5 are electrically connected to form a fourth connection end of the high-frequency isolated bidirectional power converter 2, and are electrically connected to the second connection end of the second waveform control conversion unit 3.
In application, each electronic switching tube in the first conversion circuit and the second conversion circuit can be realized by selecting a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or an Insulated Gate Bipolar Transistor (IGBT) according to actual needs, and the channel type of the electronic switching tube is selected according to actual needs.
As shown in any one of fig. 3 to 7, the seventh electronic switching tube Q7, the eighth electronic switching tube Q8, the ninth electronic switching tube Q9, the tenth electronic switching tube Q10, the eleventh electronic switching tube Q11, the twelfth electronic switching tube Q12, the thirteenth electronic switching tube Q13 and the fourteenth electronic switching tube Q14 are exemplarily shown to be P-channel enhancement MOSFETs; the drain electrodes of the seventh electronic switching tube Q7, the eighth electronic switching tube Q8, the ninth electronic switching tube Q9, the tenth electronic switching tube Q10, the eleventh electronic switching tube Q11, the twelfth electronic switching tube Q12, the thirteenth electronic switching tube Q13 and the fourteenth electronic switching tube Q14 are used as input ends, and the source electrodes are used as output ends.
In application, when the high-frequency isolation bidirectional power converter can adopt a high-frequency isolation CLLC converter, and the first conversion circuit and the second conversion circuit are full-bridge circuits or half-bridge circuits, the high-frequency isolation bidirectional power converter can also adopt a double-active converter, a series resonant converter, an LLC resonant converter, other equivalent circuits with corresponding functions or variant circuits of these circuits, and according to the power class requirement of the converter, these basic circuits can also be cascaded or at least two high-frequency transformers can be connected in series and/or in parallel.
As shown in fig. 3, in one embodiment, the high-frequency isolated bidirectional power converter 2 is a high-frequency isolated CLLC converter, the high-frequency isolated bidirectional power converter 2 further includes a first high-frequency inductor Lr1, a second high-frequency inductor Lr2, a first high-frequency capacitor Cr1 and a second high-frequency capacitor Cr2, the first high-frequency inductor Lr1 is electrically connected between the first connection end of the first converting circuit 21 and one end of a first high-frequency capacitor Cr1, the other end of the first high-frequency capacitor Cr1 is electrically connected to one end of the primary side of the high-frequency transformer T1, the second high-frequency capacitor Cr2 is electrically connected between one end of the secondary side of the high-frequency transformer and one end of a second high-frequency inductor Lr2, and the other end of the second high-frequency inductor Lr2 is electrically connected to the first connection end of the second converting circuit 22.
In application, the first high-frequency inductor and the first high-frequency capacitor form a resonance frequency equal to that of the second high-frequency inductor and the second high-frequency capacitor.
As shown in fig. 4, in one embodiment, the high-frequency isolated bidirectional power converter 2 is a dual active converter, and the high-frequency isolated bidirectional power converter 2 further includes a first high-frequency inductor Lr1, and the first high-frequency inductor Lr1 is electrically connected between the first connection terminal of the first conversion circuit 21 and one terminal of the primary side of the high-frequency transformer T1.
As shown in fig. 5, in one embodiment, the high-frequency isolated bidirectional power converter 2 is a bidirectional series resonant converter, the high-frequency isolated bidirectional power converter 2 further includes a first high-frequency inductor Lr1 and a first high-frequency capacitor Cr1, the first high-frequency inductor Lr1 is electrically connected between the first connection terminal of the first conversion circuit 21 and one end of the first high-frequency capacitor Cr1, and the other end of the first high-frequency capacitor Cr1 is electrically connected to one end of the primary side of the high-frequency transformer T1.
As shown in fig. 6, in one embodiment, the high-frequency isolated bidirectional power converter 2 is a bidirectional LLC resonant converter, the high-frequency isolated bidirectional power converter 2 further includes a first high-frequency inductor Lr1, a second high-frequency inductor Lr2, and a first high-frequency capacitor Cr1, the first high-frequency inductor Lr1 is electrically connected between the first connection terminal of the first conversion circuit 21 and one end of the first high-frequency capacitor Cr1, the other end of the first high-frequency capacitor Cr1 is electrically connected to one end of the primary side of the high-frequency transformer T1, and the second high-frequency inductor Lr2 is electrically connected to both ends of the primary side of the high-frequency transformer T1.
As shown in fig. 7, in an embodiment, the high-frequency isolated bidirectional power converter 2 is a bidirectional LLC resonant converter, the high-frequency isolated bidirectional power converter 2 further includes a first high-frequency inductor Lr1, a second high-frequency inductor Lr2, a first high-frequency capacitor Cr1 and a second high-frequency capacitor Cr2, the first high-frequency inductor Lr1 is electrically connected between the first connection terminal of the first converting circuit 21 and one end of a first high-frequency capacitor Cr1, the other end of the first high-frequency capacitor Cr1 is electrically connected to one end of the primary side of the high-frequency transformer T1, the second high-frequency inductor Lr2 is electrically connected to both ends of the primary side of the high-frequency transformer T1, and the second high-frequency capacitor Cr2 is electrically connected between one end of the secondary side of the high-frequency transformer and the first connection terminal of the second converting circuit 22.
In use, each capacitor in the high frequency isolated bidirectional power converter is a non-polar capacitor.
As shown in fig. 2, in one embodiment, the second waveform control conversion unit 3 includes a second filter network 31 and a second totem-pole network 32;
the second filter network 31 is electrically connected with the second totem-pole network 32, and the second totem-pole network 32 is electrically connected with the high-frequency isolation bidirectional power converter 2;
the second totem-pole network 32 is used for being electrically connected with the control unit 300, converting the first direct current signal into a second alternating current signal under the control of the control unit 300 and outputting the second alternating current signal to the second filter network 31;
the second filter network 31 is electrically connected to the power grid 400, and is configured to filter the second ac electrical signal and output the filtered second ac electrical signal to the power grid 400; the second totem pole network 32 is further configured to filter the third alternating-current signal output by the power grid 400 and output the third alternating-current signal to the second totem pole network;
the second totem-pole network 32 is further configured to convert the third ac electrical signal into a second dc electrical signal and output the second dc electrical signal to the high-frequency isolated bidirectional power converter 2 under the control of the control unit 300.
In application, the second filter network may be implemented by selecting a filter network, a chip or a device having a corresponding function according to actual needs, for example, an LC filter network, a CLC filter network, an LCL filter network, and the like.
As shown in fig. 3, in one embodiment, the second filter network 31 includes a seventh inductor L7, an eighth inductor L8, a ninth inductor L9, a sixth capacitor C6, a seventh capacitor C7, and an eighth capacitor C8;
one ends of the seventh inductor L7, the eighth inductor L8 and the ninth inductor L9 are respectively used for being electrically connected with the power grid 400; the other ends of the seventh inductor L7, the eighth inductor L8, and the ninth inductor L9 respectively form a first connection end, a second connection end, and a third connection end of the second filter network 31, and are used for being electrically connected to the first connection end, the second connection end, and the third connection end of the second totem-pole network 32 in a one-to-one correspondence manner;
a sixth capacitor C6 is electrically connected between one end of the seventh inductor L7 and one end of the eighth inductor L8;
the seventh capacitor C7 is electrically connected between one end of the eighth inductor L8 and one end of the ninth inductor L9;
the eighth capacitor C8 is electrically connected between one end of the seventh inductor L7 and one end of the ninth inductor L9.
In application, each inductor in the second filter network may be implemented by one high frequency inductor or by at least two high frequency inductors in series. Each capacitor in the first filter network is a non-polar capacitor.
In application, the second totem-pole network can be realized by selecting circuits, chips or devices with corresponding functions according to actual needs.
As shown in fig. 3, in one embodiment, the second totem-pole network 32 includes a fifteenth electronic switch Q15, a sixteenth electronic switch Q16, a seventeenth electronic switch Q17, an eighteenth electronic switch Q18, a nineteenth electronic switch Q19, and a twentieth electronic switch Q20;
the output end of the nineteenth electronic switching tube Q19 and the input end of the twentieth electronic switching tube Q20 are electrically connected to form a first connection end of the second totem pole network 32, and are used for being electrically connected with the first connection end of the second filter network 31;
the output end of the seventeenth electronic switch tube Q17 and the input end of the eighteenth electronic switch tube Q18 are electrically connected to form a second connection end of the second totem-pole network 32, and are used for being electrically connected with the second connection end of the second filter network 31;
the output end of the fifteenth electronic switching tube Q15 and the input end of the sixteenth electronic switching tube Q16 are electrically connected to form a third connection end of the second totem-pole network 32, and are used for being electrically connected with the third connection end of the second filter network 31;
the input ends of a fifteenth electronic switching tube Q15, a seventeenth electronic switching tube Q17 and a nineteenth electronic switching tube Q19 are electrically connected to form a first connecting end of the second waveform control conversion unit 3, and the first connecting end is used for being electrically connected with a third connecting end of the high-frequency isolation bidirectional power converter 2;
the output ends of the sixteenth electronic switching tube Q16, the eighteenth electronic switching tube Q18 and the twentieth electronic switching tube Q20 are electrically connected to form a second connection end of the second waveform control conversion unit 3, and are used for being electrically connected with the fourth connection end of the high-frequency isolation bidirectional power converter 2.
In application, each electronic switch tube in the second totem-pole network can be realized by selecting a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or an Insulated Gate Bipolar Transistor (IGBT) according to actual needs, and the channel type of the electronic switch tube is selected according to actual needs.
As shown in fig. 3, the fifteenth electronic switching tube Q15, the sixteenth electronic switching tube Q16, the seventeenth electronic switching tube Q17, the eighteenth electronic switching tube Q18, the nineteenth electronic switching tube Q19 and the twentieth electronic switching tube Q20 are exemplarily shown to be P-channel enhancement MOSFETs; the drains of the fifteenth electronic switching tube Q15, the sixteenth electronic switching tube Q16, the seventeenth electronic switching tube Q17, the eighteenth electronic switching tube Q18, the nineteenth electronic switching tube Q19 and the twentieth electronic switching tube Q20 are used as input ends, and the sources are used as output ends.
The embodiment of the utility model provides a through providing a first waveform control converting unit including electricity connection in proper order, the electronic load circuit of two-way power converter and second waveform control converting unit is kept apart to high frequency, make first waveform control converting unit and equipment under test and the control unit electricity be connected, make the two-way power converter of high frequency isolation be connected with the control unit electricity, make second waveform control converting unit and electric wire netting and the control unit electricity be connected, can realize power both-way flow and to equipment under test's active power and reactive power control under the control of the control unit, small, and low cost, high efficiency just can satisfy the equipment under test's that needs four-quadrant work test demand.
The embodiment of the utility model provides an electronic load circuit realizes based on electronic transformer principle for the equipment under test can to the repayment electric energy of electric wire netting, energy-conserving power saving; the high-frequency isolation bidirectional power converter is formed by using the high-frequency transformer and the high-frequency switching device, replaces a power frequency transformer, and has the advantages of small volume, low cost, high efficiency and convenient use; the high-frequency transformer and the conversion circuits on the two sides of the high-frequency transformer work in a full resonance state, so that the conversion efficiency is high; the input end of the high-frequency isolation bidirectional power converter is connected with the first waveform control conversion unit, and a full-master control switching device is adopted, so that the current waveform and the active and reactive power can be effectively controlled, the adaptive range of an electronic load circuit is expanded, and the requirements of tested equipment on different switching frequencies, different voltage frequencies and different voltage amplitudes are met; the bidirectional power transmission meets the test requirements of novel power electronic equipment such as electric vehicle drivers and energy storage converters.
An embodiment of the utility model also provides an electronic load device, including the control unit and electronic load circuit for test equipment.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. An electronic load circuit is characterized by comprising a first waveform control conversion unit, a high-frequency isolation bidirectional power converter and a second waveform control conversion unit which are electrically connected in sequence;
the first waveform control conversion unit is used for being electrically connected with a tested device and a control unit, filtering a first alternating current signal output by the tested device, changing a current waveform of the first alternating current signal and an included angle between a voltage waveform and a current waveform of the first alternating current signal under the control of the control unit, converting the first alternating current signal into a first direct current signal and outputting the first direct current signal to the high-frequency isolation bidirectional power converter;
the high-frequency isolation bidirectional power converter is electrically connected with the control unit, changes the voltage of the first direct current signal under the control of the control unit and outputs the voltage to the second waveform control conversion unit;
the second waveform control conversion unit is used for being electrically connected with a power grid and the control unit, converting the first direct current signal into a second alternating current signal under the control of the control unit, filtering the second alternating current signal and outputting the second alternating current signal to the power grid; the high-frequency isolation bidirectional power converter is also used for filtering a third alternating current signal output by the power grid, converting the third alternating current signal into a second direct current signal under the control of the control unit and outputting the second direct current signal to the high-frequency isolation bidirectional power converter to realize bidirectional power flow;
the high-frequency isolation bidirectional power converter is also used for changing the voltage of the second direct-current signal under the control of the control unit and outputting the voltage to the first waveform control conversion unit;
the first waveform control conversion unit is also used for converting the second direct current signal into a fourth alternating current signal under the control of the control unit, changing the current waveform of the fourth alternating current signal and the included angle between the voltage waveform and the current waveform of the fourth alternating current signal, filtering the fourth alternating current signal and outputting the filtered fourth alternating current signal to the tested equipment, and realizing bidirectional power flow and active power and reactive power control of the tested equipment.
2. The electronic load circuit according to claim 1, wherein the first waveform control conversion unit comprises a first filter network and a first totem-pole network;
the first filter network is electrically connected with the first totem-pole network, and the first totem-pole network is electrically connected with the high-frequency isolation bidirectional power converter;
the first filter network is used for being electrically connected with the tested equipment, filtering a first alternating current signal output by the tested equipment and outputting the filtered first alternating current signal to the first totem-pole network;
the first totem-pole network is used for being electrically connected with the control unit, changing the current waveform of the first alternating current signal and the included angle between the voltage waveform and the current waveform of the first alternating current signal under the control of the control unit, converting the first alternating current signal into a first direct current signal and outputting the first direct current signal to the high-frequency isolation bidirectional power converter; the second direct current signal is converted into a fourth alternating current signal under the control of the control unit, the current waveform of the fourth alternating current signal and the included angle between the voltage waveform and the current waveform of the fourth alternating current signal are changed, and the fourth alternating current signal and the included angle are output to the first filter network;
and the first filter network is also used for filtering the fourth alternating current signal and outputting the fourth alternating current signal to the tested equipment.
3. The electronic load circuit of claim 2, wherein the first filter network comprises a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a first capacitor, a second capacitor, and a third capacitor;
one end of each of the first inductor, the second inductor and the third inductor is used for being electrically connected with the tested device; the other ends of the first inductor, the second inductor and the third inductor are respectively electrically connected with one ends of the fourth inductor to the sixth inductor in a one-to-one correspondence manner;
the other ends of the fourth inductor, the fifth inductor and the sixth inductor respectively form a first connecting end, a second connecting end and a third connecting end of the first filter network, and the other ends of the fourth inductor, the fifth inductor and the sixth inductor are respectively and correspondingly electrically connected with the first connecting end, the second connecting end and the third connecting end of the first totem-pole network one by one;
one end of the first capacitor is electrically connected with the other end of the first inductor and one end of the fourth inductor, and the other end of the first capacitor is electrically connected with the other end of the second inductor and one end of the fifth inductor;
one end of the second capacitor is electrically connected with the other end of the third inductor and one end of the fifth inductor, and the other end of the second capacitor is electrically connected with the other end of the third inductor and one end of the sixth inductor;
one end of the third capacitor is electrically connected to the other end of the first inductor and one end of the fourth inductor, and the other end of the third capacitor is electrically connected to the other end of the third inductor and one end of the sixth inductor.
4. The electronic load circuit of claim 2, wherein the first totem-pole network comprises a first electronic switching tube, a second electronic switching tube, a third electronic switching tube, a fourth electronic switching tube, a fifth electronic switching tube, and a sixth electronic switching tube;
the output end of the first electronic switching tube and the input end of the second electronic switching tube are electrically connected to form a first connection end of the first totem-pole network, and the first connection end of the first totem-pole network is electrically connected with the first connection end of the first filter network;
the output end of the third electronic switching tube and the input end of the fourth electronic switching tube are electrically connected to form a second connecting end of the first totem-pole network, and the second connecting end of the first totem-pole network is electrically connected with the second connecting end of the first filter network;
the output end of the fifth electronic switching tube and the input end of the sixth electronic switching tube are electrically connected to form a third connecting end of the first totem-pole network, and the third connecting end of the first totem-pole network is electrically connected with the third connecting end of the first filter network;
the input ends of the first electronic switching tube, the third electronic switching tube and the fifth electronic switching tube are electrically connected to form a first connection end of the first waveform control conversion unit, and the first connection end is used for being electrically connected with a first connection end of the high-frequency isolation bidirectional power converter;
and the output ends of the second electronic switching tube, the fourth electronic switching tube and the sixth electronic switching tube are electrically connected to form a second connecting end of the first waveform control conversion unit, and the second connecting end is electrically connected with a second connecting end of the high-frequency isolation bidirectional power converter.
5. The electronic load circuit of claim 1, wherein the high frequency isolated bidirectional power converter comprises a first converting circuit, a second converting circuit, and a high frequency transformer;
the first converting circuit is electrically connected with the first waveform control converting unit and the primary side of the high-frequency transformer, and the second converting circuit is electrically connected with the secondary side of the high-frequency transformer and the second waveform control converting unit;
the first conversion circuit is electrically connected with the control unit, and is used for chopping the first direct current signal and outputting the chopped first direct current signal to the primary side of the high-frequency transformer;
the high-frequency transformer is used for changing the voltage of the first direct current signal and outputting the voltage to the second conversion circuit;
the second conversion circuit is electrically connected with the control unit, and is used for chopping the first direct current signal and outputting the chopped first direct current signal to the second waveform control conversion unit; the second direct current signal is chopped and then output to a secondary side of the high-frequency transformer;
the high-frequency transformer is also used for changing the voltage of the second direct current signal and outputting the second direct current signal to the first conversion circuit;
the first conversion circuit is further configured to chop the second direct current signal and output the chopped second direct current signal to the first waveform control conversion unit.
6. The electronic load circuit of claim 5, wherein the first inverter circuit and the second inverter circuit are a full bridge circuit, a half bridge circuit, a push-pull circuit, or a flyback circuit.
7. The electronic load circuit according to claim 1, wherein the second waveform control conversion unit comprises a second filter network and a second totem-pole network;
the second filter network is electrically connected with the second totem-pole network, and the second totem-pole network is electrically connected with the high-frequency isolation bidirectional power converter;
the second totem-pole network is used for being electrically connected with the control unit, converting the first direct current signal into a second alternating current signal under the control of the control unit and outputting the second alternating current signal to the second filter network;
the second filter network is used for being electrically connected with the power grid, filtering the second alternating current signal and outputting the second alternating current signal to the power grid; the second totem pole network is also used for filtering a third alternating current signal output by the power grid and outputting the third alternating current signal to the second totem pole network;
the second totem-pole network is further used for converting the third alternating current signal into a second direct current signal under the control of the control unit and outputting the second direct current signal to the high-frequency isolation bidirectional power converter.
8. The electronic load circuit of claim 7, wherein the second filter network comprises a seventh inductor, an eighth inductor, a ninth inductor, a sixth capacitor, a seventh capacitor, and an eighth capacitor;
one end of each of the seventh inductor, the eighth inductor and the ninth inductor is used for being electrically connected with the power grid;
the other ends of the seventh inductor, the eighth inductor and the ninth inductor respectively form a first connecting end, a second connecting end and a third connecting end of the second filter network, and the seventh inductor, the eighth inductor and the ninth inductor are used for being electrically connected with the first connecting end, the second connecting end and the third connecting end of the second totem-pole network in a one-to-one correspondence manner;
the sixth capacitor is electrically connected between one end of the seventh inductor and one end of the eighth inductor;
the seventh capacitor is electrically connected between one end of the eighth inductor and one end of the ninth inductor;
the eighth capacitor is electrically connected between one end of the seventh inductor and one end of the ninth inductor.
9. The electronic load circuit of claim 7, wherein the second totem-pole network comprises a fifteenth electronic switching tube, a sixteenth electronic switching tube, a seventeenth electronic switching tube, an eighteenth electronic switching tube, a nineteenth electronic switching tube, and a twentieth electronic switching tube;
the output end of the nineteenth electronic switching tube and the input end of the twentieth electronic switching tube are electrically connected to form a first connection end of the second totem-pole network, and the first connection end of the second totem-pole network is electrically connected with the first connection end of the second filter network;
the output end of the seventeenth electronic switching tube and the input end of the eighteenth electronic switching tube are electrically connected to form a second connecting end of the second totem-pole network, and the second connecting end of the second totem-pole network is electrically connected with a second connecting end of the second filter network;
the output end of the fifteenth electronic switching tube and the input end of the sixteenth electronic switching tube are electrically connected to form a third connecting end of the second totem-pole network, and the third connecting end of the second totem-pole network is electrically connected with the third connecting end of the second filter network;
the input ends of the fifteenth electronic switching tube, the seventeenth electronic switching tube and the nineteenth electronic switching tube are electrically connected to form a first connection end of the second waveform control conversion unit, and the first connection end is used for being electrically connected with a third connection end of the high-frequency isolation bidirectional power converter;
and the output ends of the sixteenth electronic switching tube, the eighteenth electronic switching tube and the twentieth electronic switching tube are electrically connected to form a second connecting end of the second waveform control conversion unit, and the second connecting end is electrically connected with a fourth connecting end of the high-frequency isolation bidirectional power converter.
10. An electronic load device, comprising a control unit and an electronic load circuit according to any one of claims 1 to 9, for testing a device under test.
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| CN202020414797.0U CN212083572U (en) | 2020-03-26 | 2020-03-26 | Electronic load device and electronic load circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111610387A (en) * | 2020-03-26 | 2020-09-01 | 深圳市鑫翊新能源科技有限公司 | Electronic load device and electronic load circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111610387A (en) * | 2020-03-26 | 2020-09-01 | 深圳市鑫翊新能源科技有限公司 | Electronic load device and electronic load circuit |
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