CN112067865A - Current source device and direct current fill electric pile check gauge calibrating installation - Google Patents
Current source device and direct current fill electric pile check gauge calibrating installation Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33515—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application provides a current source device and direct current fill electric pile check gauge calibrating installation, include: the device comprises a direct current source module, a direct current conversion module, a control module, a resonant converter, a series oscillation circuit and an alternating current conversion module; the control module is used for controlling the on-off state of the IGBT element according to preset control parameters, so that the direct current conversion module converts direct current output by the direct current source module into alternating current corresponding to the control parameters to be output to the resonant converter, and the resonant converter and the series oscillating circuit output large current. This application produces the current output that needs through the mode that utilizes the high frequency resonance that power device work produced at the on-off state, compares in the linear amplification state of linear power amplifier, and efficiency is higher, and it is very low to have solved the direct current efficiency that current direct current fills electric pile check gauge calibrating installation and adopts the mode of the programme-controlled source of simulation to produce needs, and has the serious technical problem with the energy waste of generating heat.
Description
Technical Field
The application relates to the field of power supply equipment, in particular to a current source device and a direct-current charging pile calibrator calibrating device.
Background
With the promotion of the electric automobile industry in China, the maintenance quantity of electric automobile charging piles continuously rises, a plurality of manufacturers release a direct current charging pile calibrator, and the usage quantity of the direct current charging pile calibrator is continuously increased. The verification requirements for the direct current charging pile calibrator are also presented. When the check meter is detected, controllable direct current and direct voltage for detection need to be provided. The direct current power supply of the direct current charging pile calibrator needs 250A at most for calibration, and at present, a direct current charging pile calibrator calibrating device in the industry generally adopts a mode of simulating a program control source to generate required direct current. The analog source has fast response and high precision, but the efficiency is very low, and the efficiency is generally not higher than 30%, so the technical problems of serious heat generation and energy waste exist.
Disclosure of Invention
The application provides a current source device and direct current fill electric pile check gauge calibrating installation for it is very low to solve current direct current that direct current fill electric pile check gauge calibrating installation adopted the mode of programme-controlled source of simulation to produce needs direct current efficiency, and has the serious technical problem who generates heat and the energy is extravagant.
First, a first aspect of the present application provides a current source apparatus, including: the device comprises a direct current source module, a direct current conversion module, a control module, a resonant converter, a series oscillation circuit and an alternating current conversion module;
the output end of the direct current source module is connected with the input end of the direct current conversion module;
the output end of the direct current conversion module is connected with the primary side port of the resonant converter, the secondary side port of the resonant converter is connected with the series oscillating circuit, and the series oscillating circuit is connected with the input end of the alternating current conversion module;
the output end of the alternating current conversion module is used for being connected with a direct current charging pile calibrator to be tested;
wherein, the direct current conversion module specifically includes: the four IGBT elements form a bridge arm parallel structure together;
the control module is used for controlling the on-off state of the IGBT element according to preset control parameters, so that the direct current conversion module converts direct current output by the direct current source module into alternating current corresponding to the control parameters to be output to the resonant converter, and the resonant converter and the series oscillating circuit output large current.
Preferably, the dc source module specifically includes: the three-phase alternating current power supply, the three-phase rectifier bridge and the filter capacitor;
the output end of the three-phase alternating current power supply is connected with the input end of the three-phase rectifier bridge; and the output end of the three-phase rectifier bridge is connected with the input end of the direct current conversion module and is connected with the filter capacitor in parallel.
Preferably, the alternating current conversion module specifically includes: a rectifying circuit and a high-frequency filter capacitor.
Preferably, the rectifier circuit is specifically a synchronous rectifier circuit;
the control module is further used for receiving a zero-crossing signal fed back by the synchronous rectification circuit so as to control the synchronous rectification circuit according to the zero-crossing signal.
Preferably, the method further comprises the following steps: a current measurement module;
the current measuring module is connected with the alternating current conversion module and used for collecting and measuring a current value output by the alternating current conversion module and feeding back the measured current value to the control module;
the control module is further specifically configured to update the control parameter according to a comparison result between the received current value and a preset current threshold.
Preferably, the current measuring module specifically includes: a Hall sensor and an AD7608 chip;
the Hall sensor is used for collecting the current output by the alternating current conversion module and transmitting the current to the AD7608 chip, so that the AD7608 chip detects a current value corresponding to the current and feeds the current value back to the control module.
Preferably, the control module is specifically a DSP processor.
Secondly, this application second aspect provides a direct current fills electric pile check gauge calibrating installation, its characterized in that, be equipped with like this application first aspect mentioned current source device in the direct current fills electric pile check gauge calibrating installation.
According to the technical scheme, the embodiment of the application has the following advantages:
the present application provides a current source device, comprising: the device comprises a direct current source module, a direct current conversion module, a control module, a resonant converter, a series oscillation circuit and an alternating current conversion module; the output end of the direct current source module is connected with the input end of the direct current conversion module; the output end of the direct current conversion module is connected with the primary side port of the resonant converter, the secondary side port of the resonant converter is connected with the series oscillating circuit, and the series oscillating circuit is connected with the input end of the alternating current conversion module; the output end of the alternating current conversion module is used for being connected with a direct current charging pile calibrator to be tested; wherein, the direct current conversion module specifically includes: the four IGBT elements form a bridge arm parallel structure together; the control module is used for controlling the on-off state of the IGBT element according to preset control parameters, so that the direct current conversion module converts direct current output by the direct current source module into alternating current corresponding to the control parameters to be output to the resonant converter, and the resonant converter and the series oscillating circuit output large current.
This application is based on direct current conversion module, resonant converter and series oscillation circuit, produces the current output that needs through the mode that utilizes power device work to produce the high frequency resonance that the on-off state produced, compares in the linear amplification state of linear power amplifier, and efficiency is higher, and it is very low to have solved the mode that current direct current fills electric pile check gauge calibrating installation adopts the programme-controlled source of simulation and has produced the direct current efficiency that needs, and has the serious technical problem with the energy waste of generating heat.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a current source device of a conventional calibration device for a dc charging pile calibration instrument.
Fig. 2 is a schematic structural diagram of an embodiment of a current source device provided in the present application.
Detailed Description
The embodiment of the application provides a current source device and a direct current charging pile calibration instrument calibration device, and is used for solving the problems that the direct current efficiency of the existing direct current charging pile calibration instrument calibration device is low due to the fact that a program control source simulation mode is adopted to generate needed direct current, and the technical problems of serious heating and energy waste exist.
In order to make the objects, features and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, a source of an existing calibration apparatus for a dc charging pile calibration apparatus generally adopts a mode of an analog program-controlled source, a mode of the analog program-controlled source generally adopts a mode of a signal generator and an analog power amplifier, wherein a power amplification circuit generally adopts an integrated power amplifier or a discrete device power amplifier, a linear analog power amplifier generally works in a class AB mode, and the efficiency is low and generally not higher than 30%, and 2, because of low efficiency, the power amplifier generates heat seriously, the heat dissipation requirement is large, and the requirements of a heat sink, a heat dissipation fan and the like are large, which results in a very large volume.
Referring to fig. 2, a first embodiment of the present application provides a current source device, including: the device comprises a direct current source module 2, a direct current conversion module 3, a control module 1, a resonant converter 4, a series oscillation circuit 5 and an alternating current conversion module 6.
The output end of the direct current source module 2 is connected with the input end of the direct current conversion module 3.
The output end of the direct current conversion module 3 is connected with the primary side port of the resonant converter 4, the secondary side port of the resonant converter 4 is connected with the series oscillating circuit 5, and the series oscillating circuit 5 is connected with the input end of the alternating current conversion module 6.
And the output end of the alternating current conversion module 6 is used for connecting a tested direct current charging pile calibrator.
Wherein, the dc conversion module 3 specifically includes: the four IGBT elements are IGBT1, IGBT2, IGBT3, and IGBT4, and the four IGBT elements together form an arm parallel structure.
The control module 1 is used for controlling the on-off state of the IGBT element according to preset control parameters, so that the direct current conversion module 3 converts the direct current output by the direct current source module 2 into alternating current corresponding to the control parameters, and outputs the alternating current to the resonant converter 4, so that the resonant converter 4 and the series oscillating circuit 5 output a large current.
It should be noted that, first, the control module 1 controls the isolation driver 1 and the isolation driver 4 to turn on the IGBTs 1 and 4 according to the set starting frequency, since the IGBTs 1 and 4 are turned on, the positive power and the negative power are simultaneously applied to the primary side of the resonant converter 4, the current flows from 1 to 2 on the primary side, then the IGBTs 1 and 4 are turned off after the on time is over, because the system has inductance, the current in the direction from 1 to 2 on the primary side cannot disappear immediately when the IGBTs 1 and 4 are turned off, the current will decrease while continuously flowing along the original path, but since the IGBT 7 is turned off, the inductance cannot obtain the current from the power, the current will draw the charge on the junction capacitance of the IGBT3, then the current will flow from the negative power by the body diode of the IGBT3, the potential on the primary side 1 will decrease to the voltage of the negative power, and at the same time the IGBT4 is turned off, the current will charge the junction capacitance of the IGBT4, and the drain of the IGBT4 will quickly increase the voltage of the resonant converter 4 until the voltage is higher than the voltage of the positive The current in the tube flows to the positive power supply, and the process of half cycle is completed. Then immediately after the DSP controls the IGBTs 2, 3 to turn on, the positive supply will be applied to the 2 terminal of the primary side and the negative supply will be applied to the 1 terminal of the primary side, and the current will flow in the opposite direction as the first half cycle, thereby completing a switching cycle. At the moment of switching on, there is no voltage difference between the source and drain of the IGBT2, IGBT3, and at this time, the IGBT2, IGBT3 are zero voltage switching on, and the switching loss is the voltage difference between the two ends of the power tube when switching on.
And because the current specification of the direct current charging pile is 250A direct current at most, the output of the direct current charging pile is designed according to the maximum current of 250A. The primary side current 10A, the primary-to-secondary side transformation ratio of the resonant current transformer 4 is 25: 1. The requirement can be met by selecting 60A IGBT from a full bridge power tube of a primary side switch of the resonant transformer.
The embodiment of the application is based on the operating principle of a resonance system, and by adjusting the power supply frequency or the circuit parameters, XL is equal to XC, the current and the voltage are in the same phase, and the state of the circuit is called series resonance. At series resonance, the impedance of the entire circuit is at a minimum, where Z ═ R.
The impedance of the system increases when the frequency deviates from the resonance frequency, and the system appears inductive when the frequency is higher than the resonance frequency, when the voltage leads the current. The system appears capacitive when the supply frequency is less than the resonant frequency, where the current leads the voltage.
In this state, an RLC series resonant circuit is formed by connecting the secondary side of the resonant converter 4, the resonant capacitor and the impedance of the line in series, an ac current is formed on the primary side of the resonant converter 4 by controlling the 4 IGBTs forming the full bridge circuit to be turned on in turn, and the ac current on the primary side is converted into a large current on the secondary side by the resonant converter 4.
The above is a detailed description of a first embodiment of a current source device provided in the present application, and the following is a detailed description of a second embodiment of a current source device provided in the present application.
Referring to fig. 2, based on the first embodiment, a second embodiment of the present application provides a more specific current source device, which specifically includes:
based on the content mentioned in the first embodiment, more specifically, the dc source module 2 specifically includes: the three-phase alternating current power supply, the three-phase rectifier bridge and the filter capacitor;
the output end of the three-phase alternating current power supply is connected with the input end of the three-phase rectifier bridge; the output end of the three-phase rectifier bridge is connected with the input end of the direct current conversion module 3 and is connected with the filter capacitor in parallel.
It should be noted that, the power input of the present embodiment preferably adopts three-phase rectification, and the dc power obtained by three-phase rectification has a smaller power ripple than that of a single-phase dc source, and the influence of the power superimposed on the output is smaller.
More specifically, the ac power conversion module 6 specifically includes: a rectifying circuit and a high-frequency filter capacitor.
More specifically, the rectifier circuit is specifically a synchronous rectifier circuit;
the control module 1 is further configured to receive a zero-crossing signal fed back by the synchronous rectification circuit, so as to control the synchronous rectification circuit according to the zero-crossing signal.
It should be noted that, in this embodiment, a timer integrated by the control module 1 is further used for tracking the zero-crossing information of the resonant current, and the zero-crossing signal of the resonant current is extracted by the zero-crossing signal extraction circuit. Because the voltage of the resonant circuit is superposed on the resonant circuit when the IGBT is switched on by the PWM controller of the DSP, the zero-crossing time of the voltage is the time when the IGBT is switched on, the timer is cleared when the IGBT is switched on, then the counting is started, the value of the counter is captured when the current zero-crossing signal arrives, and the captured counting value represents the phase difference between the voltage and the current. The phase difference is used to determine whether the system is operating in a voltage-lead sensing state. To improve the efficiency of the system, the system is maintained in a zero voltage on and near zero current off state, so it must be ensured that the voltage of the system leads the current.
The working process of the synchronous rectifier comprises the following steps:
the control mode of the synchronous rectifier is that when current flows from the 3 end to the 4 end of the resonant converter 4, P4 and P1 of the synchronous rectifier are switched on, the current flows from the resonant converter 4 to P4 and then flows to a load, namely, a tested direct current charging pile check meter, then passes through a current measuring circuit, then passes through P1 and then flows back to the 3 end of the resonant converter 4 through a zero-crossing and overcurrent signal extraction circuit, and current closed loop is completed. When the current flows from the 4 end to the 3 end of the resonant converter 4, P2 and P3 of the synchronous rectifier are switched on, the current flows from the 3 end of the resonant converter 4 to P2 through the zero and overcurrent signal extraction circuit, then flows to the load, then flows through the current measurement circuit, and then flows back to the 4 end of the resonant converter 4 through P2, so that the current closed loop is completed.
Since the change of the current direction of the primary side and the secondary side of the resonant converter 4 is consistent, the DSP controller can prejudge whether the current flowing in the synchronous rectifier is about to be commutated. The current in the secondary side after the primary side is commutated is also commutated. Because the voltage is ahead of the current, the secondary current commutates after the primary side IGBT switch commutates after a certain time delay. The DSP detects the zero crossing signal, and drives the power tube in the synchronous rectifier to change the rectifying direction temporarily when the zero crossing signal comes.
More specifically, the method further comprises the following steps: a current measurement module 7;
the current measuring module 7 is connected with the alternating current conversion module 6 and is used for collecting and measuring a current value output by the alternating current conversion module 6 and feeding the measured current value back to the control module 1;
the control module 1 is further specifically configured to update the control parameter according to a comparison result between the received current value and a preset current threshold.
More specifically, the current measurement module 7 specifically includes: a Hall sensor and an AD7608 chip;
the Hall sensor is used for collecting the current output by the alternating current conversion module 6 and transmitting the current to the AD7608 chip, so that the AD7608 chip detects a current value corresponding to the current and feeds the current value back to the control module 1.
The current measuring circuit of the embodiment adopts AD7608 as an analog-digital sampler, utilizes a SPORT port and an AD7608 interface of a BF609DSP processor, and utilizes a DMA function of the SPORT port to automatically and continuously sample current data. The measuring circuit samples the output current by using the Hall current sensor
More specifically, the control module 1 is embodied as a DSP processor.
According to the technical scheme of the embodiment, the embodiment of the application has the following advantages:
1. the required current output is generated in a high-frequency resonance mode, and the efficiency is much higher than that of a linear amplification state of a linear power amplifier because the power device works in a switching state.
2. The power device works in a zero-voltage switching-on mode by controlling the system to be in an inductive state, so that the switching loss is further reduced.
3. And the alternating current is converted into direct current through a synchronous rectification technology, and the direct current is provided for the charging pile calibrator for verification.
4. Because the system works in a high-frequency state, the volume of the resonant converter 4 is very small, and the capacity of an output filter capacitor is very small.
5. Because the whole system has small loss, the heat dissipation requirement is greatly reduced, and the volume is reduced.
6. The high-voltage low current of the primary side is converted into the low-voltage high current of the secondary side through the resonant converter 4, and meanwhile, the electrical isolation is realized, and the output safety is ensured.
The above is a detailed description of a second embodiment of a current source device provided in the present application.
It should be noted that the current source device provided in this embodiment is applied to the calibration device of the dc charging pile calibration instrument to calibrate the dc charging pile calibration instrument.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (8)
1. A current source device, comprising: the device comprises a direct current source module, a direct current conversion module, a control module, a resonant converter, a series oscillation circuit and an alternating current conversion module;
the output end of the direct current source module is connected with the input end of the direct current conversion module;
the output end of the direct current conversion module is connected with the primary side port of the resonant converter, the secondary side port of the resonant converter is connected with the series oscillating circuit, and the series oscillating circuit is connected with the input end of the alternating current conversion module;
the output end of the alternating current conversion module is used for being connected with a direct current charging pile calibrator to be tested;
wherein, the direct current conversion module specifically includes: the four IGBT elements form a bridge arm parallel structure together;
the control module is used for controlling the on-off state of the IGBT element according to preset control parameters, so that the direct current conversion module converts direct current output by the direct current source module into alternating current corresponding to the control parameters to be output to the resonant converter, and the resonant converter and the series oscillating circuit output large current.
2. The current source device according to claim 1, wherein the dc source module specifically comprises: the three-phase alternating current power supply, the three-phase rectifier bridge and the filter capacitor;
the output end of the three-phase alternating current power supply is connected with the input end of the three-phase rectifier bridge; and the output end of the three-phase rectifier bridge is connected with the input end of the direct current conversion module and is connected with the filter capacitor in parallel.
3. The current source device according to claim 1, wherein the ac power conversion module specifically comprises: a rectifying circuit and a high-frequency filter capacitor.
4. A current source device according to claim 3, wherein the rectifier circuit is a synchronous rectifier circuit;
the control module is further used for receiving a zero-crossing signal fed back by the synchronous rectification circuit so as to control the synchronous rectification circuit according to the zero-crossing signal.
5. A current source arrangement according to claim 1, further comprising: a current measurement module;
the current measuring module is connected with the alternating current conversion module and used for collecting and measuring a current value output by the alternating current conversion module and feeding back the measured current value to the control module;
the control module is further specifically configured to update the control parameter according to a comparison result between the received current value and a preset current threshold.
6. The current source device according to claim 1, wherein the current measurement module specifically comprises: a Hall sensor and an AD7608 chip;
the Hall sensor is used for collecting the current output by the alternating current conversion module and transmitting the current to the AD7608 chip, so that the AD7608 chip detects a current value corresponding to the current and feeds the current value back to the control module.
7. A current source device according to claim 1, wherein said control module is embodied as a DSP processor.
8. A calibration device for a dc charging pile calibration instrument, wherein the current source device according to any one of claims 1 to 7 is assembled in the calibration device for the dc charging pile calibration instrument.
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| CN202010960413.XA CN112067865A (en) | 2020-09-14 | 2020-09-14 | Current source device and direct current fill electric pile check gauge calibrating installation |
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| CN202010960413.XA CN112067865A (en) | 2020-09-14 | 2020-09-14 | Current source device and direct current fill electric pile check gauge calibrating installation |
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Cited By (1)
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| CN114047401A (en) * | 2021-11-29 | 2022-02-15 | 国网北京市电力公司 | Automatic detection device of direct current charging pile tester |
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Application publication date: 20201211 |