CN107248821B - Nonlinear load simulation device - Google Patents
Nonlinear load simulation device Download PDFInfo
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- CN107248821B CN107248821B CN201710665644.6A CN201710665644A CN107248821B CN 107248821 B CN107248821 B CN 107248821B CN 201710665644 A CN201710665644 A CN 201710665644A CN 107248821 B CN107248821 B CN 107248821B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
Abstract
The invention discloses a nonlinear load simulation device which comprises a rectifier bridge, a resistance-capacitance pairing cluster, a diode cluster, a direct-current solid-state relay cluster, an insulated gate bipolar transistor and a trigger control unit, wherein the rectifier bridge is connected with the resistance-capacitance pairing cluster; the rectifier bridge performs full-wave rectification on the alternating current output by the inverter to be tested to convert the alternating current into pulsating direct current; the diode cluster, the resistance-capacitance pairing cluster and the direct-current solid-state relay cluster are sequentially connected to the output end of the rectifier bridge; the insulated gate bipolar transistor is connected to the lower end of the parallel point of the direct-current solid-state relay cluster, and on-off control is performed on the resistance-capacitance pairing cluster and rectified pulsating direct current; the trigger control unit is connected between the output ends of the rectifier bridge and used for controlling the on and off of the insulated gate bipolar transistor. According to the invention, the current peak value factor can be adjusted by adjusting the trigger control unit; through the control of the resistance-capacitance pairing cluster, the load power can be adjusted.
Description
Technical Field
The invention relates to the field of inverter power supplies, in particular to a nonlinear load simulation device.
Background
The inverter power supply converts direct current electric energy into alternating current electric energy (mainly power frequency alternating current electric energy) through the converter so as to meet the power consumption requirements of conventional power consumption equipment under special conditions (such as field and power failure).
With the development of science and technology, electronic devices are more and more widely applied. Therefore, the inverter power supply supplies power to the electronic device in many application scenarios. However, electronic devices generally include a rectifying and filtering circuit, and such a circuit is characterized by: the current and the voltage do not have a linear corresponding relation, only when the instantaneous value of the power supply voltage exceeds the terminal voltage of the filter capacitor, the current is generated, and the current value is related to the capacity of the filter capacitor, the instantaneous value of the power supply terminal voltage, the difference value of the terminal voltage of the capacitor and the line impedance. This current exhibits a strong pulse characteristic with peaks much higher than the linear load current of the same power, and therefore such a load is called a non-linear load. Electrically, the ratio of the peak to the effective value of the periodic current is referred to as the crest factor, usually denoted by CF.
The peak current of the nonlinear load is a great challenge to the current-carrying electronic devices of the inverter power supply. The CF value of the input current of the computer-type load can reach 2.4-2.6, so that the inverter is generally required to provide an output capability with a CF value of 3. If the reliability requirement is higher, the requirement on the current CF value bearing capacity of the inverter is higher.
The bearing capacity of the inverter for the current crest factor is checked, and the work which must be finished in the production and the manufacture of the inverter is required. Therefore, the inverter needs to be connected to a nonlinear load to test the load capacity of the inverter. The existing nonlinear load is simulated according to an RCD circuit, and the load power and the current crest factor are adjusted by adjusting the resistance value of a resistor and the capacity of a capacitor.
However, the nonlinear load simulator constituted by the RCD circuit has the following disadvantages:
1. the adjustment of resistance value of the resistor and the capacitance capacity are mutually coupled, so that the load power and the current peak value factor are not changed according to an expected rule, and the adjustment difficulty is high.
2. In a nonlinear load simulation device formed by the RCD circuit, when the CF is close to 2.8, the CF is difficult to be adjusted upwards no matter the resistance power is increased or the capacitance is increased. This is clearly not sufficient for increasingly stringent reliability evaluations.
Disclosure of Invention
In view of this, an object of the present invention is to provide a nonlinear load simulation apparatus, which solves the problems of difficult adjustment and limited amplitude of current crest factor when a conventional RCD circuit is used for simulation in the existing inverter loading test.
The invention aims to realize the technical scheme that the nonlinear load simulation device comprises a rectifier bridge, a resistance-capacitance pairing cluster, a diode cluster, a direct-current solid-state relay cluster, an insulated gate bipolar transistor and a trigger control unit;
the rectifier bridge performs full-wave rectification on alternating current output by the inverter to be tested to convert the alternating current into pulsating direct current;
the diode cluster, the resistance-capacitance pairing cluster and the direct-current solid-state relay cluster are sequentially connected to the output end of the rectifier bridge;
the insulated gate bipolar transistor is connected to the lower end of the parallel point of the direct-current solid-state relay cluster, and on-off control is performed on the resistance-capacitance pairing cluster and the rectified pulsating direct current;
the trigger control unit is connected between the output ends of the rectifier bridge and used for controlling the on and off of the insulated gate bipolar transistor, and the diode cluster comprises a plurality of parallel diodes; the resistance-capacitance pairing cluster comprises resistance-capacitance pairing units the number of which is the same as that of the diodes; the direct current solid state relay cluster comprises direct current solid state relays the number of which is the same as that of the diodes; each diode corresponds to one resistance-capacitance pairing unit, and each resistance-capacitance pairing unit corresponds to one direct-current solid-state relay; the positive pole of each diode is connected with the output end of the rectifier bridge, the negative pole of each diode is connected with the input end of the resistance-capacitance pairing unit, the output end of the resistance-capacitance pairing unit is connected with the positive pole of the direct-current solid-state relay, and the negative pole of the direct-current solid-state relay is connected with the collector electrode of the insulated gate bipolar transistor.
Further, the resistance-capacitance pairing unit comprises a capacitor and a resistor, and the capacitor is connected with the resistor in parallel.
Further, the trigger control unit comprises an isolation transformer, a zero-crossing detection module, a light isolator, a voltage stabilizing module and a single chip microcomputer; the isolation transformer is connected with the output end of the inverter to be tested; the output end of the isolation transformer is connected with the input end of the zero-crossing detection module, and the zero-crossing detection module is connected with the input end of the single chip microcomputer through an optical isolator; the voltage stabilizing module supplies power to the singlechip; and the output end of the singlechip is connected with the control electrode G end of the insulated gate bipolar transistor.
Due to the adoption of the technical scheme, the invention has the following advantages:
the current peak value factor can be adjusted by adjusting the trigger control unit; through the control of the resistance-capacitance pairing cluster, the load power can be adjusted. Therefore, the load simulation device realizes the adjustment of two dimensions of the current crest factor and the load power, the mutual coupling is small, the adjustment effect is expected, and the adjustment amplitude is higher than that of the traditional technology.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the present invention;
fig. 2 is a schematic diagram of the trigger control unit.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, and are not intended to limit the scope of the present invention.
A nonlinear load simulation device comprises a rectifier bridge, a resistance-capacitance pairing cluster, a diode cluster, a direct-current solid-state relay, an Insulated Gate Bipolar Transistor (IGBT) and a trigger control unit.
The rectifier bridge performs full-wave rectification on the alternating current output by the inverter to be tested to convert the alternating current into pulsating direct current.
The resistance-capacitance pairing cluster comprises a plurality of resistance-capacitance parallel combinations with matched pairs of resistance values and capacitance. The principle of resistance-capacitance parameter matching is as follows: 1. the current peak factors of all groups working under the pulsating direct current voltage are consistent; 2. the load power values are arranged according to a binary rule.
The diode cluster comprises a plurality of diodes with the number matched with the resistance-capacitance parallel combination, and is arranged at the upper end of each resistance-capacitance parallel combination to play a role in unidirectional isolation and avoid coupling interference among all groups of resistance-capacitance parallel combinations.
The direct current solid-state relay cluster comprises a plurality of direct current solid-state relays, the number of the direct current solid-state relays is matched with the number of the resistance-capacitance parallel combinations, the direct current solid-state relays are arranged at the lower end of each resistance-capacitance parallel combination, and the direct current solid-state relays are used for performing access and breaking control on each resistance-capacitance parallel combination.
And the Insulated Gate Bipolar Transistor (IGBT) is connected to the lower end of the parallel point of the direct current solid-state relay cluster, and controls the on-off of the resistance-capacitance pairing cluster and the rectified pulsating direct current electric energy.
The trigger control unit controls the IGBT to be turned on and off at appropriate timings.
The working principle is as follows:
the alternating current electric energy from the output end of the inverter power supply to be detected is converted into pulsating direct current electric energy under the action of the rectifier bridge; an isolation transformer of the trigger control unit samples the alternating-current voltage output by the inverter to be tested, a zero-crossing detection module detects the zero-crossing time of the voltage, and a time reference signal of the zero-crossing time is synchronously transmitted to the single chip microcomputer through an optical isolation; the single chip microcomputer delays and outputs a control signal according to a set program by taking the time of a zero crossing point as a reference, an Insulated Gate Bipolar Transistor (IGBT) is controlled to be conducted, and the inverter charges the resistance-capacitance pairing cluster; and after a certain time delay, the Insulated Gate Bipolar Transistor (IGBT) is controlled to be turned off, and the inverter stops charging the resistance-capacitance pairing cluster. By changing the delay time of turning on and off, the timing of starting and stopping the RC charge can be changed. If the IGBT is switched on when the instantaneous value of the power supply voltage is higher than the current terminal voltage value of the capacitor, higher charging peak current can be obtained; if the conduction time is short, the pulse width of the output current of the inverter to be tested is narrow, the effective value is reduced, the peak value is high, and the current crest factor is adjusted to be high. By changing the conduction combination rule of the direct current solid-state relay cluster, the grouping rule of the connected resistance-capacitance parallel combination can be changed, and therefore the load power is changed. The diode cluster unidirectionally isolates each resistance-capacitance parallel combination, thereby avoiding the influence on the characteristics caused by mutual coupling interference when the groups are connected in parallel and improving the controllability.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is apparent that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (2)
1. A nonlinear load simulation apparatus, characterized in that: the direct-current solid-state relay comprises a rectifier bridge, a resistance-capacitance pairing cluster, a diode cluster, a direct-current solid-state relay cluster, an insulated gate bipolar transistor and a trigger control unit;
the rectifier bridge performs full-wave rectification on alternating current output by the inverter to be tested to convert the alternating current into pulsating direct current;
the diode cluster, the resistance-capacitance pairing cluster and the direct current solid-state relay cluster are sequentially connected to the output end of the rectifier bridge;
the insulated gate bipolar transistor is connected to the lower end of the parallel point of the direct-current solid-state relay cluster, and on-off control is performed on the resistance-capacitance pairing cluster and rectified pulsating direct current;
the trigger control unit is connected between the output ends of the rectifier bridge and used for controlling the on and off of the insulated gate bipolar transistor, and the diode cluster comprises a plurality of parallel diodes; the resistance-capacitance pairing cluster comprises resistance-capacitance pairing units the number of which is the same as that of the diodes; the direct current solid state relay cluster comprises direct current solid state relays the number of which is the same as that of the diodes; each diode corresponds to one resistance-capacitance pairing unit, and each resistance-capacitance pairing unit corresponds to one direct-current solid-state relay; the anode of each diode is connected with the output end of the rectifier bridge, the cathode of each diode is connected with the input end of the resistance-capacitance pairing unit, the output end of the resistance-capacitance pairing unit is connected with the anode of the direct-current solid-state relay, and the cathode of the direct-current solid-state relay is connected with the collector of the insulated gate bipolar transistor;
the trigger control unit comprises an isolation transformer, a zero-crossing detection module, a light isolator, a voltage stabilizing module and a single chip microcomputer; the isolation transformer is connected with the output end of the inverter to be tested; the output end of the isolation transformer is connected with the input end of the zero-crossing detection module, and the zero-crossing detection module is connected with the input end of the single chip microcomputer through an optical isolator; the voltage stabilizing module supplies power to the single chip microcomputer; the output end of the single chip microcomputer is connected with the control electrode G end of the insulated gate bipolar transistor;
the isolation transformer samples the alternating-current voltage output by the inverter to be detected, the zero-crossing detection module detects the zero-crossing time of the voltage, and the time reference signal of the zero-crossing time is synchronously transmitted to the single chip microcomputer through the optical isolation; the singlechip delays and outputs a control signal according to a set program by taking the time of a zero crossing point as a reference, controls the conduction of the insulated gate bipolar transistor and charges the resistance-capacitance pairing cluster by the inverter to be tested; and (5) controlling the Insulated Gate Bipolar Transistor (IGBT) to be switched off after time delay, and stopping charging the resistance-capacitance pairing cluster by the inverter to be tested.
2. The nonlinear load simulation apparatus of claim 1, wherein: the resistance-capacitance pairing unit comprises a capacitor and a resistor, and the capacitor is connected with the resistor in parallel.
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| CN201710665644.6A CN107248821B (en) | 2017-08-07 | 2017-08-07 | Nonlinear load simulation device |
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| CN201710665644.6A CN107248821B (en) | 2017-08-07 | 2017-08-07 | Nonlinear load simulation device |
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| CN107248821B true CN107248821B (en) | 2023-04-18 |
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| CN108400799B (en) * | 2018-04-18 | 2024-02-13 | 深圳市全智芯科技有限公司 | Novel method for starting wireless pairing |
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| JP2008102050A (en) * | 2006-10-20 | 2008-05-01 | Meidensha Corp | Load testing device of pulse power supply |
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| CN105301520A (en) * | 2015-11-24 | 2016-02-03 | 北京东方计量测试研究所 | Adjustable nonlinear load configuration system |
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