CN209117841U - DC load is set to have the device of exchange load function - Google Patents
DC load is set to have the device of exchange load function Download PDFInfo
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- CN209117841U CN209117841U CN201821810995.8U CN201821810995U CN209117841U CN 209117841 U CN209117841 U CN 209117841U CN 201821810995 U CN201821810995 U CN 201821810995U CN 209117841 U CN209117841 U CN 209117841U
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The utility model discloses a kind of devices for making DC Electronic Loads have exchange load function, the device includes: that rectifier bridge and tested AC power source are electrically connected, the positive terminal of the DC voltage with pulsation of rectifier bridge transformation is connected to the input positive terminal of the DC load with Current Waveform Control function, and the input negative pole end of the DC load with Current Waveform Control function is connected to after the negative pole end series direct current power supply of DC voltage.Tested AC power source is rectified into pulsating dc voltage by the device；Phase relation by adjusting DC load current phase and tested input ac voltage phasetophase simulates resistive, capacitive or inductive load.It is able to achieve and carries out exchange load with DC Electronic Loads, electronic load suitable for the test of various AC power sources, supply frequency is different from mains frequency, have in input side and loads identical characteristic with actual impedance, more actual experimental effect can be obtained, load utilization is improved, AC electric source testing cost is reduced.
Description
The present application claims priority of chinese patent application entitled "control method for implementing high precision ac loading with dc electronic load" filed by chinese patent office on 23/10/2018 with application number 201811239380.9, which is incorporated herein by reference in its entirety.
Technical Field
The utility model relates to a power test field especially relates to a make direct current electronic load possess device of exchanging loading function.
Background
An alternating current Electronic Load (AC Electronic Load) is a power Electronic device that can simulate a traditional real impedance Load, it can simulate a fixed or varying Load, and even feed back the test power to the grid. Before leaving the factory, the ac power supply usually needs to be subjected to a load capability test and a discharge test to check the technical index and the working performance thereof. The AC electronic load is a power electronic device based on power electronic technology and automatic control technology, can accurately and flexibly simulate the discharge effect of a real load according to the requirement, and effectively overcomes the defects of inconvenient regulation, low automation degree, poor flexibility, single load form and the like of the traditional load consisting of passive devices such as a resistor, a capacitor, an inductor and the like. The alternating current electronic load can effectively overcome the defects by adopting the alternating current electronic load for testing, so that the testing is simpler and more flexible, and the testing cost is greatly reduced.
The prior art has a full-bridge PWM rectification energy-consumption type alternating current electronic load, the alternating current electronic load only completes the function of load characteristic simulation, is realized by a VSR working in a rectification state, and can simulate various loads with power factors continuously changing from minus 1 to plus 1 by directly controlling the phase and the magnitude of current at an input side. In the alternating current electronic load, a load characteristic simulation part is current single-loop control, as shown in fig. 1, a current reference signal is set by an external operation panel or an upper computer, and the phase relation between the current reference signal and an input voltage is adjusted, so that the input end of the PWM rectifier presents different impedance characteristics, and loads with different properties including a pure resistor, a pure inductor, a pure capacitor load and a combination thereof are simulated. The active power generated by the tested power supply is finally consumed on the direct current side resistor. When the resistance value of the resistor is constant, the voltage of the direct current side is determined by the input active power, and the voltage is lower when the active power is smaller. In order to effectively control the AC side current of the PWM rectifier, the DC side voltage should be at least greater than the peak value of the input AC voltage.
The full-bridge PWM rectification energy-consumption type alternating current electronic load uses the pure resistor for energy consumption, the dissipated energy is a passive resistor device, phase adjustment cannot be achieved through the dissipated load, the preceding stage is required for voltage phase conversion of the load, and the problem of high control difficulty exists. Meanwhile, the resistor is required to be a non-inductive resistor in the alternating current electronic load, but in the practical application process, the real non-inductive resistor cannot be realized due to factors such as connecting wires and the like, so that the phase loading precision can be influenced, the performance close to a circuit can be influenced due to the fact that the energy consumption resistor generates heat seriously and can reach 400 ℃, and potential safety hazards exist.
In the prior art, a full-bridge rectification and inversion energy feedback type ac electronic load is provided, as shown in fig. 2, and the energy feedback type ac electronic load is mainly composed of a two-stage voltage type PWM converter having a common dc bus. The input stage PWM rectifier is connected with a tested power supply through an input filter inductor L1 to form a load characteristic simulation part of the electronic load, and the input stage PWM rectifier works in an AC-DC rectification state; the output-stage PWM inverter is connected with a power grid through an output filter inductor L2 and an isolation transformer T to form an energy feedback part; the load characteristic simulation part and the energy feedback part are mutually independent in control. The load characteristic simulation adopts a single current instantaneous value control mode to control the magnitude and the waveform of the input current, which is the same as the energy consumption type electronic load; the energy feedback part adopts a voltage and current double closed loop comprising a phase synchronization link to control the output current waveform of the power grid side and the DC bus voltage; the energy feedback type alternating current electronic load has small self loss and high power factor at the network side, and is energy-saving automatic test equipment.
The full-bridge rectification and inversion energy feedback type alternating current electronic load can realize alternating current loading, can feed energy to be consumed back to a 220V alternating current power grid by using a feedback technology, is mainly applied to high-power alternating current power supply testing, and has larger electromagnetic interference due to high-frequency PMW conversion, so that the electromagnetic interference is easily caused to peripheral electric equipment; higher current harmonics exist in the energy feedback process, which affects the quality of a power grid; if no load is consumed in the power grid, the power loading cannot be realized, so that certain limitation is realized in the application process.
SUMMERY OF THE UTILITY MODEL
Based on the problem that prior art exists, the utility model aims at providing a make direct current electronic load possess and exchange loaded device, can realize exchanging the loading function through direct current load, improve the utilization ratio of load, reduce alternating current power supply's test cost.
The utility model aims at realizing through the following technical scheme:
the utility model discloses embodiment provides a make direct current electronic load possess device of exchanging loading function, include:
the rectifier bridge, direct current load and direct current power supply with current waveform control function; wherein,
the rectifier bridge is electrically connected with a tested alternating current power supply, the positive end of direct current voltage with pulsation converted by the rectifier bridge is connected to the input positive end of a direct current load with a current waveform control function, and the negative end of the direct current voltage is connected in series with the direct current power supply and then is connected to the input negative end of the direct current load with the current waveform control function.
By the foregoing the utility model provides a technical scheme can see out, the embodiment of the utility model provides a make direct current electronic load possess and exchange loaded device, its beneficial effect is:
after the detected alternating current power supply is rectified and converted into the pulsating direct current voltage, the negative end of the direct current voltage is connected in series with a direct current power supply and then is connected to the input negative end of the direct current load with the current waveform control function, so that the direct current load and the detected alternating current power supply are in a series connection mode, when the direct current load carries out current waveform simulation, the waveform style of the current flowing through the detected alternating current power supply is consistent with the current waveform of the direct current load, the control of the current of the detected alternating current power supply can be realized by adjusting the current waveform of the direct current load with the current waveform control function, and the simulation of a resistive load, a capacitive load and an inductive load can be realized by adjusting the phase relation between the current phase of the direct current load and the input alternating current voltage of the detected alternating current power supply according to the load characteristics of resistance, capacitance and inductance. Particularly, by arranging the direct-current power supply, the lowest point of the voltage waveform loaded to the direct-current load can be the positive half-cycle steamed bun waveform of the direct-current power supply, and the problem that the direct-current load cannot be loaded when the measured alternating-current power supply crosses zero can be solved. The device well realizes that the DC electronic load is used for AC loading, is suitable for electronic loads of various AC power supply tests, the frequency of the power supply can be different from the frequency of a power grid, and the input side of the device has the same characteristic as a real impedance load, so that a more real test effect can be obtained, the utilization rate of the load is improved, and the test cost of the AC power supply is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a circuit configuration of a load characteristic simulation part of an ac electronic load according to a first prior art;
fig. 2 is a schematic diagram of a load characteristic simulation circuit of an ac electronic load according to a second prior art;
fig. 3 is a schematic diagram of a circuit configuration of an apparatus for providing an ac loading function to a dc electronic load according to an embodiment of the present invention;
fig. 4 is a schematic view of a waveform of a resistive load voltage and current of a measured ac power supply in the control method according to the embodiment of the present invention;
fig. 5 is a schematic diagram of a waveform of a resistive load voltage and a current of a dc load in the control method according to an embodiment of the present invention;
fig. 6 is a schematic view of a capacitive load voltage current waveform of a power supply to be measured in the control method according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a voltage waveform of a dc load capacitive load in the control method according to the embodiment of the present invention;
in fig. 3: 1-a rectifier bridge; 2-direct current load with current waveform control function; 3-a direct current power supply; 4-AC power to be tested.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the specific contents of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Details not described in the embodiments of the present invention belong to the prior art known to those skilled in the art.
As shown in fig. 3, an embodiment of the present invention provides an apparatus for making a dc electronic load have an ac loading function, including:
the rectifier bridge, direct current load and direct current power supply with current waveform control function; wherein,
the rectifier bridge is electrically connected with a tested alternating current power supply, the positive end of direct current voltage with pulsation converted by the rectifier bridge is connected to the input positive end of a direct current load with a current waveform control function, and the negative end of the direct current voltage is connected in series with the direct current power supply and then is connected to the input negative end of the direct current load with the current waveform control function.
In the above device, the dc power supply is: 5V direct current power supply.
In the above apparatus, the dc load having the current waveform control function is: a dc electronic load or a dc power consumer capable of regulating current.
In the above device, the rectifier bridge is a full bridge rectifier bridge.
In the device, the full-bridge rectifier bridge is composed of independent rectifier diodes D1, D2, D3 and D4 or adopts a packaged rectifier bridge.
An embodiment of the present invention provides a control method for enabling a dc electronic load to have an ac loading function, for use in the above-mentioned apparatus (see fig. 3), including:
rectifying the tested alternating current power supply to convert the alternating current power supply into direct current voltage with pulsation;
connecting the positive end of the direct current voltage to the input positive end of a direct current load with a current waveform control function, and connecting the negative end of the direct current voltage to the input negative end of the direct current load with the current waveform control function after connecting a direct current power supply in series;
controlling the current of the tested alternating current power supply by adjusting the current waveform of the direct current load with the current waveform control function;
and simulating the load characteristics of resistance, capacitance and inductance by adjusting the phase relation between the current phase of the direct current load with the current waveform control function and the input alternating current voltage of the alternating current power supply to be detected.
In the above control method, the simulating a resistive load, a capacitive load, or an inductive load by adjusting a phase relationship between a current phase of the dc load having the current waveform control function and an input ac voltage phase of the ac power supply to be measured includes:
when a resistive load is simulated, adjusting the current waveform of the direct current load with the current waveform control function to be in the same phase with the voltage waveform of the alternating current power supply to be detected; as can be seen from the purely resistive load characteristics, the current phase is the same as the voltage phase. Therefore, the pure resistive load simulation can be realized by controlling the current waveform of the direct current load to be in the same phase with the voltage of the alternating current power supply to be detected, the relation between the voltage and the current phase of the alternating current power supply to be detected is shown in fig. 4, and the relation between the current control waveform and the voltage phase of the direct current load end is shown in fig. 5.
When a capacitive load is simulated, adjusting the phase of the current waveform of the direct current load with the current waveform control function to be ahead of the voltage waveform of the alternating current power supply to be tested; as can be seen from the capacitive load characteristics, the current phase leads the voltage phase. Therefore, capacitive load simulation can be achieved by controlling the phase of the current waveform of the dc load to be ahead of the same phase of the voltage of the ac power supply to be measured, the relationship between the voltage and the current of the ac power supply to be measured is shown in fig. 6, and the relationship between the current control waveform and the voltage phase of the dc load is shown in fig. 7.
When an inductive load is simulated, the current waveform of the direct current load with the current waveform control function is adjusted to lag behind the phase of the voltage waveform of the alternating current power supply to be tested. When an inductive load is simulated, the current phase lags behind the voltage phase as can be seen from the inductive load characteristics. Therefore, the inductive load simulation can be realized by controlling the phase of the current waveform of the direct current load to lag behind the same phase of the voltage of the alternating current power supply to be measured. The control method is the same as that of the inductive load, and the phase lag can be realized.
The utility model discloses a control method can realize carrying out the AC loading with direct current electronic load, is applicable to the experimental electronic load of various alternating current power supplies, and the frequency of power can be different from the frequency of electric wire netting, and it has the same characteristic with true impedance load at the input side, therefore can gain more true experimental effect, improves the utilization ratio of load, reduces alternating current power supply's test cost.
Further, in the above control method, one dc power supply connected in series to the negative terminal of the dc voltage is: 5V direct current power supply.
Further, in the above control method, the dc load having the current waveform control function is: a dc electronic load or a dc power consumer capable of regulating current.
Further, in the above control method, the step of converting the measured ac power source into a pulsating dc voltage by rectification comprises: the alternating current power supply to be measured is rectified and converted into direct current voltage with pulsation through a rectifier bridge.
Further, in the above control method, in the method, the full-bridge rectifier bridge is used for rectification, and the full-bridge rectifier bridge is composed of individual rectifier diodes D1, D2, D3 and D4 or a packaged rectifier bridge is used.
Further, in the above control method, simulating resistive, capacitive, and inductive load characteristics by adjusting a phase relationship between a current phase and an input ac voltage of the ac power supply to be measured includes:
further, in the control method, since the dc load and the ac power source to be measured are in series, the waveform pattern of the current flowing through the ac power source to be measured is identical to the current waveform of the dc load, and the current of the ac power source to be measured can be controlled by adjusting the current waveform of the dc load having the current waveform control function.
The embodiments of the present invention will be described in further detail below.
The utility model provides an among the control method who carries out interchange loading with direct current load, the circuit that relates to is as shown in fig. 3, the rectifier bridge that the alternating current power supply of being surveyed passes through D1, D2, D3, D4 is constituteed becomes to have pulsating direct current voltage, wherein direct current electronic load (the direct current load that has current waveform control function promptly) input positive terminal is inserted to direct current voltage's direct current positive terminal, direct current electronic load's negative pole end is connected to the negative pole end of the direct current voltage who obtains after the rectification behind the 5V direct current power supply of series connection of negative pole end. The control of the alternating current to be measured can be realized by adjusting the current waveform on the direct current electronic load; the load characteristics of resistance, capacitance and inductance are simulated by adjusting the phase relation between the current phase and the input alternating voltage.
The utility model discloses the working process and various load wave forms that control method relates to are shown in fig. 4 to fig. 7, and when the pure resistive load of needs simulation, form the positive half cycle steamed bun wave form of minimum voltage zero after the rectification by the alternating current supply voltage of being surveyed. Because the 5V direct-current power supply is added in the loop, the voltage waveform loaded to the direct-current electronic load is a positive half-cycle steamed bun waveform (as shown in figure 4) with the lowest point of 5V, so that the problem that the direct-current load cannot be loaded when the tested alternating-current power supply crosses zero can be solved. Because the whole connection test loop is a series loop, when the direct current electronic load carries out current waveform simulation, the waveform pattern of the current flowing through the tested alternating current power supply is consistent with the waveform of the direct current electronic load.
Preferably, in the above method, the dc electronic load may also adopt other similar dc loads having a current waveform control function, and may all realize an ac loading function; meanwhile, the series-connected 5V direct-current power supply is mainly used for eliminating the dead working area of the direct-current electronic load, so that the direct-current power supply with any voltage can be replaced according to the loading capacity of the direct-current electronic load.
The utility model provides a realize interchange loaded control method with direct current electronic load principle has utilized the equivalent characteristic of series current of loop, realizes the loading to alternating current power supply through the current waveform of control direct current side, realizes the simulation of capacitive, hindering nature, perception load through control current and alternating voltage's phase relation simultaneously. Because the direct current load can be used for realizing the alternating current loading function in a modification mode, the application range of the direct current load is effectively expanded, and the modular design of alternating current and direct current electronic load series products is facilitated.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. An apparatus for providing an ac loading function to a dc electronic load, comprising:
the rectifier bridge, direct current load and direct current power supply with current waveform control function; wherein,
the rectifier bridge is electrically connected with a tested alternating current power supply, the positive end of direct current voltage with pulsation converted by the rectifier bridge is connected to the input positive end of a direct current load with a current waveform control function, and the negative end of the direct current voltage is connected in series with the direct current power supply and then is connected to the input negative end of the direct current load with the current waveform control function.
2. The apparatus according to claim 1, wherein the dc power supply comprises: 5V direct current power supply.
3. The apparatus according to claim 1 or 2, wherein the dc load having the current waveform control function is: a dc electronic load or a dc power consumer capable of regulating current.
4. The apparatus according to claim 1 or 2, wherein the rectifier bridge is a full bridge rectifier bridge.
5. The apparatus of claim 4, wherein the full bridge rectifier bridge is composed of separate rectifier diodes D1, D2, D3 and D4 or is a packaged rectifier bridge.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811239380 | 2018-10-23 | ||
| CN2018112393809 | 2018-10-23 |
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| CN201811307995.0A Pending CN109239622A (en) | 2018-10-23 | 2018-11-05 | DC load is set to have the device and control method of exchange load function |
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Cited By (2)
| 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 |
| CN111856094A (en) * | 2020-07-27 | 2020-10-30 | 江苏莱提电气股份有限公司 | Harmonic current generating device and method for controlling harmonic current stepless linear output |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI726606B (en) * | 2020-02-07 | 2021-05-01 | 群光電能科技股份有限公司 | Load identification system |
| CN112838774B (en) * | 2020-12-30 | 2022-03-11 | 合肥科威尔电源系统股份有限公司 | Control method of high-power RLC alternating current electronic load |
| CN114545123B (en) * | 2022-02-23 | 2024-08-27 | 科威尔技术股份有限公司 | Control method for improving dynamic performance of high-power direct-current electronic load |
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| KR830002573Y1 (en) * | 1979-09-12 | 1983-12-06 | 보그-워너 코퍼레이션 | Control Regenerative DC Power |
| CA1154085A (en) * | 1979-09-12 | 1983-09-20 | William F. Wirth | Controlled regenerative d-c power supply |
| US6218853B1 (en) * | 1998-12-11 | 2001-04-17 | Daniel Liu | Circuit arrangement for simulating alternating current load |
| CN1603849A (en) * | 2004-10-29 | 2005-04-06 | 山东大学 | General simulator for electrical load |
| CN100526892C (en) * | 2006-03-16 | 2009-08-12 | 西安爱科电子有限责任公司 | Energy feedback type AC/DC electronic load simulator |
| CN202939293U (en) * | 2012-12-02 | 2013-05-15 | 威海广泰空港设备股份有限公司 | Alternating-current 400Hz medium-frequency power supply test system with electric power feedback function |
| JP2014176287A (en) * | 2013-03-11 | 2014-09-22 | Ryuichi Shimada | Ac power controller |
| CN204514973U (en) * | 2014-12-29 | 2015-07-29 | 艾德克斯电子（南京）有限公司 | A kind of AC electronic load device improving waveform distortion under rectification mode |
| CN204405816U (en) * | 2015-01-29 | 2015-06-17 | 深圳出入境检验检疫局玩具检测技术中心 | A kind of system DC Electronic Loads being applied to interchange equipment under test |
| CN209117841U (en) * | 2018-10-23 | 2019-07-16 | 北京大华无线电仪器有限责任公司 | DC load is set to have the device of exchange load function |
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2018
- 2018-11-05 CN CN201821810995.8U patent/CN209117841U/en not_active Expired - Fee Related
- 2018-11-05 CN CN201811307995.0A patent/CN109239622A/en active Pending
Cited By (2)
| 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 |
| CN111856094A (en) * | 2020-07-27 | 2020-10-30 | 江苏莱提电气股份有限公司 | Harmonic current generating device and method for controlling harmonic current stepless linear output |
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| CN109239622A (en) | 2019-01-18 |
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