CN110780098A - DC heavy current standard source - Google Patents
DC heavy current standard source Download PDFInfo
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- CN110780098A CN110780098A CN201911000976.8A CN201911000976A CN110780098A CN 110780098 A CN110780098 A CN 110780098A CN 201911000976 A CN201911000976 A CN 201911000976A CN 110780098 A CN110780098 A CN 110780098A
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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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Abstract
The invention discloses a DC heavy current standard source, which adopts a plurality of secondary follow-up synchronous rectification BULK power supplies to convert the output of a primary switch power supply and provide the converted output to a corresponding power MOS, wherein the output voltage of the secondary follow-up synchronous rectification BULK power supplies is controllable in follow-up, the output current of the power MOS is controllable, and the plurality of power MOS are connected in parallel to set the output current. The invention adopts the modularized design idea, can be connected in parallel at will, the power MOS of each linear power amplification unit is powered by an independent secondary follow-up synchronous rectification BULK power supply and is provided with an independent error control unit, each power MOS adopts source electrode output, a current sampling unit is connected between the source electrode of each MOS and the output end in series, the output current is ensured, the output current of each power MOS is balanced, and the current output range of the power MOS can be expanded at will.
Description
Technical Field
The invention relates to the field of direct current large current generation, in particular to a direct current large current standard source.
Background
The traditional DC standard large current generation usually adopts the working principle of a switching power supply, the switching conversion is only one stage, and the power is directly rectified and supplied by commercial power; the output target current is taken value by a specific current sampling element, a sampling signal is properly conditioned and amplified, then the sampling signal is sent to an error amplifier to be compared with a reference signal, the amplified error signal is compared with a modulation signal to output a PWM signal with a certain pulse width, the power device is controlled to be switched on and off at proper time, and finally the required direct current is rectified and output by a high-frequency transformer. When the switching power supply mode is adopted to output standard large current, the following defects exist:
the switch conversion is only one stage, and for the condition of outputting low-voltage large current, the high-frequency transformer has large turn ratio of the primary and secondary stages, large leakage inductance and easy generation of electromagnetic interference; the power device works in a switching mode, the switching noise of the power device is large, particularly, the power device is small under the condition of light load, the pulse width of a PWM signal is small, the signal-to-noise ratio is reduced, the ripple wave of output current is increased, and the stability is poor; when the output current is linearly reduced, the pulse width of the PWM signal is reduced, the signal-to-noise ratio is reduced, the stability of the output current is also deteriorated, and the current output accuracy is reduced, so that the whole measuring range meeting the index requirement is reduced; the output range of the rated current is not easy to expand, and the application is very limited.
Accordingly, the prior art is deficient and needs improvement.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a realization scheme of a direct-current high-current standard source.
The technical scheme of the invention is as follows: the invention provides a direct current heavy current standard source, which adopts a plurality of secondary follow-up synchronous rectification BULK power supplies to convert the output of a primary switching power supply and provide the converted output to corresponding power MOS (metal oxide semiconductor), wherein the output voltage of the secondary follow-up synchronous rectification BULK power supplies is controllable in follow-up mode, the output current of the power MOS is controllable, and the power MOS is provided with the output current in parallel.
Further, the standard source of the direct current large current comprises: the input end the one-level switching power supply, the current output module, the output of a plurality of parallelly connected settings of control unit, current output module includes secondary follow-up synchronous rectification BULK power and linear power amplifier unit, linear power amplifier unit includes the power MOS.
Further, the input end is mains supply.
Further, the primary switching power supply is used for converting the mains supply at the input end into a DC voltage for output.
Further, the current output module further includes: the voltage drop detection unit is used for detecting the voltage drop of the corresponding power MOS in real time and transmitting the voltage drop signal to the corresponding feedback control unit, and the feedback control unit adjusts the output voltage of the corresponding secondary follow-up synchronous rectification BULK power supply according to the voltage drop signal so as to ensure that the voltage drop of the corresponding power MOS tube is constant.
Further, the feedback control unit compares the internal reference signal with the voltage drop signal to amplify an error, and then sends the amplified error signal to the corresponding secondary follow-up synchronous rectification BULK power supply, so as to adjust the output voltage of the corresponding secondary follow-up synchronous rectification BULK power supply.
Further, the linear power amplifier unit still includes current sampling unit and error amplification unit, current sampling unit is used for the real-time acquisition to correspond power MOS's output current size and give sampling current signal error amplification unit, error amplification unit is used for to corresponding thereby it is invariable to carry out drive control to power MOS and guarantee the correspondence the electric current that power MOS passed through.
Further, the control unit is configured to independently control each of the error amplifying units.
Furthermore, the currents output by the power MOS are converged and superposed and then output through the output end.
By adopting the scheme, the invention adopts a modular design, has simple control and convenient range expansion, is easy to realize the output of the DC standard large current of more than 1000A, ensures the range output range of the index to reach more than 100 times, and expands the application range of the DC large current standard source in the field of the verification equipment; the output ripple is reduced, and the stability and the accuracy of the direct current output under the light load condition and in the full range are greatly improved; the output power consumption of the linear power amplifier unit is ensured to be constant under the condition of rated current output, the output efficiency of the power amplifier under the condition of light load is greatly increased, the heat dissipation design difficulty of the power amplifier is greatly reduced, and the design volume and the weight of the whole direct-current large-power standard source are effectively reduced; the device has the advantages of wide output range, small ripple, good stability, low heat generation, high accuracy and the like, and can be widely applied to detection of products and elements such as various direct current heavy current sensors, shunts, large ammeters and the like.
Drawings
FIG. 1 is a block diagram of the structural connection of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Referring to fig. 1, in the present embodiment, the present invention provides a dc high-current standard source, which provides an output voltage of a primary switching power supply 11 to a plurality of secondary follow-up synchronous rectification buck power supplies 12(22, …, N2), and provides outputs of the plurality of secondary follow-up synchronous rectification buck power supplies 12(22, …, N2) to corresponding power MOS, wherein the output voltage of the secondary follow-up synchronous rectification buck power supplies 12(22, …, N2) is controllable in follow-up, the output current of the power MOS is controllable, and the plurality of power MOS are connected in parallel to set the output current. Specifically, the dc high current standard source includes: input, one-level switching power supply 11, the control unit 10, a plurality of current output module, output, it is a plurality of the parallel arrangement of current output module, current output module includes: the secondary follow-up synchronous rectification BULK power supply 12(22, …, N2), the linear power amplification unit 13(23, …, N3), the voltage drop detection unit 14(24, …, N4), the feedback control unit 15(25, …, N5), the linear power amplification unit 13(23, …, N3) includes: the device comprises an error amplifying unit, a current sampling unit and a power MOS. The commercial power is connected to the input, one-level switching power supply 11 with input commercial power connection, one-level switching power supply 11 will through the internal transformation the commercial power of input changes suitable DC direct voltage output, for each the power supply of secondary follow-up synchronous rectification BULK power 12(22, …, N2). The secondary follow-up synchronous rectification BULK power supply 12(22, …, N2) is used for supplying power to the corresponding linear power amplification unit 13(23, …, N3). Each power MOS is connected to the output terminal, the voltage drop detection unit 14(24, …, N4) is configured to detect the tube voltage drop of the corresponding power MOS in real time and transmit a voltage drop signal to the corresponding feedback control unit 15(25, …, N5), after receiving the voltage drop signal, the feedback control unit 15(25, …, N5) compares the internal reference signal with the detected signal, performs error amplification, and sends the amplified error signal to the corresponding secondary follow-up synchronous rectification BULK power supply 12(22, …, N2), so as to adjust the output of the corresponding secondary follow-up synchronous rectification BULK power supply 12(22, …, N2), and through the detection-feedback-adjustment process, it is ensured that the tube voltage drop of the corresponding power MOS is always constant. The current sampling unit samples the current that the power MOS that corresponds passed through in real time to with sampling signal transfer to corresponding the error amplification unit, the error amplification unit is used for to corresponding thereby it is invariable to carry out drive control to the power MOS the current that the power MOS passed through. The control unit 10 is configured to independently control each error amplifying unit, so as to control the magnitude of the output current I1(I2, …, IN) of each power MOS, and further control the magnitude of the total output current Iout, where the output terminal is connected to the source of each power MOS for outputting a direct current.
This application has increased the synchronous rectification BULK power of secondary follow-up on traditional one-level switch transform basis, by the synchronous rectification BULK power of secondary follow-up gives the power supply of linear power amplifier unit of final stage, through right the pipe drop detection feedback of the power MOS in the linear power amplifier unit compares with the reference signal who sets for, and the signal is enlargied in output error, goes control through this error amplification signal the synchronous rectification BULK power output voltage's of secondary follow-up size to guarantee that the linear power amplifier unit of final stage when the constant current is exported, no matter how the output load changes, the consumption of power MOS is invariable. The final-stage output adopts a linear power amplifier structure, so that the output ripple of the direct current heavy current is effectively reduced, and the stability of the output direct current under the light load condition is greatly improved. The tail end linear power amplifiers adopt a modular design idea and can be connected in parallel at will, the power MOS of each linear power amplifier unit is supplied with power by an independent secondary follow-up synchronous rectification BULK power supply and is provided with an independent error control unit, each power MOS adopts source electrode output, a current sampling unit is connected between the source electrode of each MOS and the output end in series, the output current of each power MOS is ensured, the output current of each power MOS is balanced, and the current output range of each power MOS can be expanded at will by independently controlling the input of each error amplification unit.
In conclusion, the scheme adopts a modular design, is simple to control and convenient and fast to expand the measuring range, can easily realize the output of the direct current large current of more than 1000A, ensures that the measuring range output range of the index can reach more than 100 times, and expands the application range of the direct current large current standard source in the field of the verification equipment; the output ripple is reduced, and the stability and the accuracy of the direct current output under the light load condition and in the full range are greatly improved; the output power consumption of the linear power amplifier unit is ensured to be constant under the condition of rated current output, the output efficiency of the power amplifier unit under the condition of light load is greatly increased, the heat dissipation design difficulty of the power amplifier is greatly reduced, and the design volume and the weight of the whole direct current heavy current standard source are effectively reduced; the device has the advantages of wide output range, small ripple, good stability, low heat generation, high accuracy and the like, and can be widely applied to detection of products and elements such as various direct current heavy current sensors, shunts, large ammeters and the like.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A direct-current large-current standard source is characterized in that a plurality of secondary follow-up synchronous rectification BULK power supplies are adopted to convert output of a primary switching power supply and provide the converted output to corresponding power MOS, the output voltage of the secondary follow-up synchronous rectification BULK power supplies is controllable in follow-up mode, the output current of the power MOS is controllable, and the power MOS is connected in parallel to form the output current.
2. The standard source of high dc current according to claim 1, comprising: the input end the one-level switching power supply, the current output module, the output of a plurality of parallelly connected settings of control unit, current output module includes secondary follow-up synchronous rectification BULK power and linear power amplifier unit, linear power amplifier unit includes the power MOS.
3. A dc high current standard source according to claim 2, wherein the input terminal is mains power.
4. A DC high-current standard source according to claim 2 or 3, wherein the primary switching power supply is configured to convert the mains power supply at the input end into a DC voltage output.
5. The dc high current standard source of claim 2, wherein the current output module further comprises: the voltage drop detection unit is used for detecting the corresponding tube voltage drop of the power MOS in real time and transmitting the voltage drop signal to the corresponding feedback control unit, and the feedback control unit adjusts the output voltage of the corresponding secondary follow-up synchronous rectification BULK power supply according to the voltage drop signal so as to ensure that the tube voltage drop of the corresponding power MOS is constant.
6. The DC large-current standard source according to claim 5, wherein the feedback control unit performs error amplification by comparing the internal reference signal with the voltage drop signal, and then sends the amplified error signal to the corresponding secondary follow-up synchronous rectification BULK power supply, thereby adjusting the output voltage of the corresponding secondary follow-up synchronous rectification BULK power supply.
7. The direct-current large-current standard source according to claim 2, wherein the linear power amplifier unit further comprises a current sampling unit and an error amplifying unit, the current sampling unit is configured to collect output current of the corresponding power MOS in real time and send a sampled current signal to the error amplifying unit, and the error amplifying unit is configured to perform drive control on the corresponding power MOS so as to ensure that a current passing through the corresponding power MOS is constant.
8. The DC high-current standard source according to claim 7, wherein the control unit is configured to control each error amplification unit independently.
9. The direct-current high-current standard source according to claim 2, wherein current confluence of the power MOS outputs are superposed and then output through the output end.
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| CN201911000976.8A CN110780098A (en) | 2019-10-21 | 2019-10-21 | DC heavy current standard source |
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| CN201911000976.8A CN110780098A (en) | 2019-10-21 | 2019-10-21 | DC heavy current standard source |
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Citations (5)
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| CN109407035A (en) * | 2018-12-29 | 2019-03-01 | 云南电网有限责任公司电力科学研究院 | A kind of high current generating system based on MOSFET pipe |
| CN110146730A (en) * | 2019-06-20 | 2019-08-20 | 云南电网有限责任公司电力科学研究院 | A kind of high-current generation device based on modulation SPWM |
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2019
- 2019-10-21 CN CN201911000976.8A patent/CN110780098A/en active Pending
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| CN202306370U (en) * | 2011-09-21 | 2012-07-04 | 广东电网公司电力科学研究院 | Direct-current strong current generator |
| US20150061631A1 (en) * | 2013-09-03 | 2015-03-05 | Lapis Semiconductor Co., Ltd. | Semiconductor device and current amount control method |
| CN206422528U (en) * | 2016-12-28 | 2017-08-18 | 青岛东来电气设备有限公司 | High-current generation device and system |
| CN109407035A (en) * | 2018-12-29 | 2019-03-01 | 云南电网有限责任公司电力科学研究院 | A kind of high current generating system based on MOSFET pipe |
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Application publication date: 20200211 |