CN109239622A - DC load is set to have the device and control method of exchange load function - Google Patents
DC load is set to have the device and control method of exchange load function Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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 invention discloses a kind of devices and control method for making DC Electronic Loads have exchange load function, 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.Method includes: that tested AC power source is rectified into pulsating dc voltage；Phase relation by adjusting DC load current phase and tested input ac voltage phasetophase simulates resistive, capacitive or inductive load.The device and method, which is able to achieve, 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 invention relates to the field of power supply testing, in particular to a device and a control method for enabling a direct current electronic load to have an alternating current 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.
Disclosure of Invention
Based on the problems existing in the prior art, the invention aims to provide a device and a control method for enabling a direct current electronic load to have alternating current loading, which can realize an alternating current loading function through the direct current load, improve the utilization rate of the load and reduce the test cost of an alternating current power supply.
The purpose of the invention is realized by the following technical scheme:
the embodiment of the invention provides a device for enabling a direct current electronic load to have an alternating current loading function, which comprises:
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.
The embodiment of the invention also provides a control method for enabling the direct current electronic load to have an alternating current loading function, which is used for the device provided by the invention and comprises the following steps:
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.
According to the technical scheme provided by the invention, the device and the control method for enabling the direct current electronic load to have the alternating current loading have the beneficial effects that:
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 and the control method well realize the AC loading by the DC electronic load, are 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 needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the 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 voltage-current waveform of a resistive load of a dc load in the control method according to the embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a voltage-current waveform of a capacitive load of a power supply to be measured in the control method according to the embodiment of the present invention;
fig. 7 is a schematic diagram of a voltage waveform of a capacitive load of a dc load in the control method according to the embodiment of the 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 are clearly and completely described below with reference to the specific contents of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.
As shown in fig. 3, an apparatus for enabling a dc electronic load to have an ac loading function according to an embodiment of the present invention includes:
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, which is used for the above apparatus (see fig. 3), and includes:
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 control method of the invention can realize AC loading by using the DC electronic load, 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 power supply has the same characteristic as a real impedance load, thereby obtaining more real test effect, improving the utilization rate of the load and reducing the test cost of the AC power supply.
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 are described in further detail below.
In the control method for performing ac loading by using a dc load according to the present invention, as shown in fig. 3, a detected ac power source is converted into a dc voltage having a ripple through a rectifier bridge composed of D1, D2, D3, and D4, wherein a dc positive terminal of the dc voltage is connected to an input positive terminal of a dc electronic load (i.e., a dc load having a current waveform control function), and a negative terminal of the dc electronic load is connected in series with a 5V dc power source and then connected to a negative terminal of the dc voltage obtained after rectification. 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 working process and various load waveforms related to the control method of the invention are shown in fig. 4 to 7, and when a pure resistive load needs to be simulated, the voltage of the alternating current power supply to be detected forms a positive half-cycle steamed bun waveform with the lowest voltage of zero after rectification. 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 control method for realizing alternating current loading by using the direct current electronic load principle utilizes the characteristics of series current equality of a loop, realizes loading of an alternating current power supply by controlling the current waveform of a direct current side, and realizes simulation of capacitive, resistive and inductive loads by controlling the phase relation of current and alternating voltage. 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 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 included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
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.
6. A control method for providing an ac loading function to a dc electronic load, for use in the apparatus of any one of claims 1 to 5, comprising:
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 a resistive load, a capacitive load or an inductive load 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 phase of the alternating current power supply to be tested.
7. The method according to claim 6, wherein the step of simulating a resistive load, a capacitive load or an inductive load by adjusting the phase relationship between the current phase of the dc load with current waveform control function and the input ac voltage phase of the ac power supply to be tested comprises:
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;
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;
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.
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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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| CN112838774A (en) * | 2020-12-30 | 2021-05-25 | 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 |
| CN113253005A (en) * | 2020-02-07 | 2021-08-13 | 群光电能科技股份有限公司 | Load recognition system |
| CN114545123A (en) * | 2022-02-23 | 2022-05-27 | 合肥科威尔电源系统股份有限公司 | Control method for improving dynamic performance of high-power direct-current electronic load |
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| 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 |
| 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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| 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 |
Cited By (5)
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| CN113253005A (en) * | 2020-02-07 | 2021-08-13 | 群光电能科技股份有限公司 | Load recognition system |
| CN113253005B (en) * | 2020-02-07 | 2024-01-12 | 群光电能科技股份有限公司 | Load identification system |
| CN112838774A (en) * | 2020-12-30 | 2021-05-25 | 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 |
| CN114545123A (en) * | 2022-02-23 | 2022-05-27 | 合肥科威尔电源系统股份有限公司 | Control method for improving dynamic performance of high-power direct-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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