CN204514973U - A kind of AC electronic load device improving waveform distortion under rectification mode - Google Patents
A kind of AC electronic load device improving waveform distortion under rectification mode Download PDFInfo
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- CN204514973U CN204514973U CN201420849391.XU CN201420849391U CN204514973U CN 204514973 U CN204514973 U CN 204514973U CN 201420849391 U CN201420849391 U CN 201420849391U CN 204514973 U CN204514973 U CN 204514973U
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Abstract
The utility model provides a kind of AC electronic load device improving waveform distortion under rectification mode, for fictitious load characteristic, a year test is drawn to AC power product, comprise voltage/current sample circuit, digital control circuit, rectification circuit and power model M1, voltage/current sample circuit is connected to the output voltage/electric current measuring AC power product between power supply product and digital control circuit, the output voltage that digital control circuit accepts AC power product exports analog control signal control power model M1 after digital control circuit calculates, rectification circuit is electrically connected between AC power product and power model M1, adaptive voltage source V 1 or biasing circuit is serially connected with between rectification circuit and power model M1, the working current realizing electronic load device is more true, makes the current waveform of emulation not producing intermodulation distortion close to during zero point, can real simulation equidimensional ideal resistive load.
Description
Technical field
The utility model relates to a kind of electronic load device, particularly a kind of AC electronic load device improving waveform distortion under rectification mode.
Background technology
AC power product all needs to carry out load test to check electric property and the fan-out capability of AC power product in development & production process or before product export.Traditional power supply test and Performance Detection generally all apply to comprise the passive loads such as resistive load, inductive load, capacitive load and resistance sense appearance mixing and carry out, because passive load is in power supply test, active energy is all consumed by resistive load, energy consumption is large, thermal value is large, poor stability, also there is the shortcomings such as load regulation inconvenience, thus AC electronic load device is used widely.
AC electronic load device refers to the electronic equipment of some characteristic of energy Reality simulation load, it not only can simulate the resistance of different numerical value, inductance, electric capacity and their combination, also can simulate for some characteristic of nonlinear load, be the developing direction of AC power product experiment test load.AC electronic load device is in order to test the performance of AC power product, it comprises voltage/current sample circuit, digital control circuit, rectification circuit and power model M1, rectification circuit be a bridge rectifier its be electrically connected between power supply product and power model M1, bridge rectifier carries out full-wave rectification to the output voltage of AC power product, and AC electronic load device can realize the emulation of multiple test pattern and various complexity band carrier wave shape by the power model M1 after rectification circuit.
But, AC electronic load device of the prior art when rectification mode band carries due to the characteristic of the diode forward forward voltage in rectifier bridge, cause the current waveform that emulates producing intermodulation distortion close to during zero point, thus cannot real simulation equidimensional ideal resistive load.Therefore, above-mentioned Problems existing solves in the urgent need to us.
Utility model content
The purpose of this utility model is to provide a kind of electronic load device, solves the characteristic due to the diode forward forward voltage in rectification circuit, causes the current waveform emulated in the problem close to generation intermodulation distortion during zero point.
In order to realize above-mentioned order, the technical solution of the utility model is to provide a kind of AC electronic load device improving waveform distortion under rectification mode, for fictitious load characteristic, a year test is drawn to AC power product, comprise voltage/current sample circuit, digital control circuit, rectification circuit and power model M1, voltage/current sample circuit is connected to the output voltage/electric current measuring AC power product between power supply product and digital control circuit, the output voltage that digital control circuit accepts AC power product exports analog control signal control power model M1 after digital control circuit calculates, rectification circuit is electrically connected between AC power product and power model M1, adaptive voltage source V 1 or biasing circuit is serially connected with between rectification circuit and power model M1.
Described biasing circuit comprises voltage source V 1, diode D5 and on-off circuit K, and diode D5 is connected in series the branch circuit parallel connection of on-off circuit K with voltage source V 1.
Rectification circuit is full wave bridge rectifier.
The beneficial effects of the utility model are by sealing in suitable voltage source V 1 or biasing circuit after rectification circuit, thus lifting input voltage make input voltage be less than commutation diode forward conduction voltage range also can output current, thus the working current of electronic load device can be made truer, make the current waveform of emulation not producing intermodulation distortion close to during zero point, can real simulation equidimensional ideal resistive load.
Accompanying drawing explanation
Fig. 1 is prior art AC electronic load device principle schematic;
Fig. 2 is the principle schematic that the utility model embodiment powers up potential source V1;
Fig. 3 is the principle schematic that the utility model embodiment is biased circuit;
Fig. 4 is prior art AC electronic load device distorted waveform;
Fig. 5 is the utility model electronic load oscillogram.
Embodiment
Preferred embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
Embodiment one, as depicted in figs. 1 and 2, the present embodiment electronic load device comprises voltage/current sample circuit module, output voltage and electric current for treating test cross stream power supply product detect, digital control circuit comprises digital signal processor DSP and digital to analog converter DAC, receiver voltage/current sampling signal carry out processing and export simulation control signal in order to control power model M1, AC power product to be measured connects power model M1 by the rectifier bridge of rectification circuit, bias voltage source V1 is provided with between rectifier bridge and power model M1, in circuit structure after rectifier bridge and power model M1 have sealed in voltage source V 1, the situation of <V1 would not be there is in the input voltage of power model M1, this just makes the input voltage V2 of electronic load device can pulling load current when free voltage, can not too low because of input voltage V2 time cannot draw carry cause local current distortion as shown in Figure 4.
The present embodiment is used for lifting voltage can be continued to keep conducting state to make the power component of power model M1, to obtain the complete waveform of load current, as shown in Figure 5.Effectively understand and test AC power product electrical specification.
Embodiment two, as shown in Figure 3, the present embodiment is when the electric current of power model M1 increases, and the electric current of the voltage source V 1 of series connection also increases accordingly, thus causes its power to increase.For the power reducing to seal in voltage source V 1 adopts biasing circuit, the on-off circuit K that biasing circuit comprises voltage source V 1, diode D5 and is connected in parallel on D5, the instantaneous value of input voltage V2 is judged by voltage detecting circuit, as the instantaneous value absolute value <Vthd of V2, switch is closed allows voltage source V 1 seal in loop, thus voltage source V 1 is sealed in before V2 instantaneous value <Vfd, allow power model M1 carry by continuous band, also can be reduced the power requirement of series-connection power supplies.And the necessary >Vfd of above-mentioned Vthd, the output voltage of AC power product to be measured carries out full-wave rectification through the rectifier bridge of electronic load, amplification driving circuit U1 according to given reference voltage level and the magnitude of voltage of current sampling resistor of connecting with power model M1 with driving power module M1.
Claims (3)
1. one kind is improved the AC electronic load device of waveform distortion under rectification mode, for fictitious load characteristic, a year test is drawn to AC power product, comprise voltage/current sample circuit, digital control circuit, rectification circuit and power model M1, voltage/current sample circuit is connected to the output voltage/electric current measuring AC power product between power supply product and digital control circuit, the output voltage that digital control circuit accepts AC power product exports analog control signal control power model M1 after digital control circuit calculates, rectification circuit is electrically connected between AC power product and power model M1, it is characterized in that: between rectification circuit and power model M1, be serially connected with adaptive voltage source V 1 or biasing circuit.
2. a kind of AC electronic load device improving waveform distortion under rectification mode according to claim 1, it is characterized in that: described biasing circuit comprises voltage source V 1, diode D5 and on-off circuit K, and diode D5 is connected in series the branch circuit parallel connection of on-off circuit K with voltage source V 1.
3. a kind of AC electronic load device improving waveform distortion under rectification mode according to claim 1 and 2, is characterized in that: rectification circuit is full wave bridge rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420849391.XU CN204514973U (en) | 2014-12-29 | 2014-12-29 | A kind of AC electronic load device improving waveform distortion under rectification mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420849391.XU CN204514973U (en) | 2014-12-29 | 2014-12-29 | A kind of AC electronic load device improving waveform distortion under rectification mode |
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| Publication Number | Publication Date |
|---|---|
| CN204514973U true CN204514973U (en) | 2015-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420849391.XU Active CN204514973U (en) | 2014-12-29 | 2014-12-29 | A kind of AC electronic load device improving waveform distortion under rectification mode |
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| CN (1) | CN204514973U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109239622A (en) * | 2018-10-23 | 2019-01-18 | 北京大华无线电仪器有限责任公司 | DC load is set to have the device and control method of exchange load function |
-
2014
- 2014-12-29 CN CN201420849391.XU patent/CN204514973U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109239622A (en) * | 2018-10-23 | 2019-01-18 | 北京大华无线电仪器有限责任公司 | DC load is set to have the device and control method of exchange load function |
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