CN-121996005-A - Power supply calibration system and working method thereof

CN121996005ACN 121996005 ACN121996005 ACN 121996005ACN-121996005-A

Abstract

The application relates to the technical field of power calibration, and discloses a power calibration system and a working method thereof, wherein the power calibration system comprises a reference source calibration circuit, a sampling calibration circuit, a power calibration circuit and a main control unit; and in the period that the power supply continuously operates normally, the control unit controls the change-over switch to switch one of the main sampling circuit and the auxiliary sampling circuit which are in the idle state to the calibration state at regular time so as to update the second mapping relation corresponding to the sampling circuit, correct the sampling voltage based on the updated second mapping relation, simultaneously keep the other sampling circuit in the normal output sampling state, and finely adjust the output voltage of the power calibration circuit in real time by combining the third mapping relation. The power supply calibration device can automatically and regularly calibrate the sampling circuits on the premise of maintaining normal and continuous operation of the power supply, reliably compensates any temperature drift and time drift generated by the last calibration of each sampling circuit, and can maintain long-term and continuous high-precision output of the power supply.

Inventors

ZHANG JIN
DAI YU
LI WENTING
CHEN HUIYU
WU MENGYANG

Assignees

广州金升阳科技有限公司

Dates

Publication Date: 20260508
Application Date: 20251230

Claims (7)

1. The power calibration system is characterized by comprising a reference source calibration circuit, a sampling calibration circuit, a power calibration circuit and a main control unit; The reference source calibration circuit is electrically connected with the main control unit and is used for establishing a first mapping relation between the set output voltage and the actual output voltage of the reference source and providing accurate reference voltage with full range for the sampling calibration circuit; The sampling calibration circuit is electrically connected with the main control unit and the reference source calibration circuit and comprises at least one group of main sampling circuit, sub-sampling circuit and a change-over switch controlled by the control unit, wherein the sampling end of each sampling circuit is connected with the change-over switch, and in a calibration state, the change-over switch is switched to be connected with the output end of the reference source calibration circuit and is used for establishing a second mapping relation between the sampling voltage of each sampling circuit and the actual output voltage of the reference source calibration circuit based on the accurate reference voltage provided by the first mapping relation, so as to obtain an accurate sampling value of the power supply and prepare for adjusting the actual output voltage of the power supply; The power calibration circuit is electrically connected with the main control unit and the sampling calibration circuit, and is used for establishing a third mapping relation between the set output voltage and the actual output voltage of the power supply and finely adjusting the actual output voltage of the power supply based on the accurate sampling value; The control unit is configured to establish and store the first mapping relation, the second mapping relation and the third mapping relation in an initial calibration stage, and to control the change-over switch to switch one of the main sampling circuit and the auxiliary sampling circuit which are currently in an idle state to a calibration state at regular time during continuous normal operation of the power supply so as to update the second mapping relation corresponding to the sampling circuit, correct the sampling voltage based on the updated second mapping relation, simultaneously keep the other sampling circuit in a normal output sampling state, and perform real-time fine adjustment on the output voltage of the power calibration circuit in combination with the third mapping relation.
2. The power calibration system of claim 1, wherein: the main sampling circuit, the sub-sampling circuit and the switching switch are matched with the power output channels in number, and the sampling ends of the main sampling circuit and the sub-sampling circuit of each channel are respectively connected with the corresponding switching switch; In the normal running state of the power supply, the main control unit controls the change-over switch to respectively switch and connect the input ends of the main sampling circuit or the auxiliary sampling circuit corresponding to each channel to the output ends of the reference source calibration circuit corresponding to the channel.
3. The power calibration system of claim 2, wherein: The reference source calibration circuit collects actual output voltage of the reference source in the full range through a high-precision universal meter, and establishes a first mapping relation between set output voltage and actual output voltage of the reference source, wherein the first mapping relation is expressed by a piecewise approximation function, and the relation is Vrt= krn XVref+brn; Wherein Vrt is the actual output voltage of a reference source measured by a high-precision universal meter, vref is the set output voltage of the reference source, kn and brn are parameters of the piecewise function, and the main control unit stores the parameters, the piecewise points and the number of the piecewise functions of the relational expression.
4. The power calibration system of claim 2, wherein: The sampling calibration circuit switches the main sampling circuit and the auxiliary sampling circuit to the reference source output end through the change-over switch, polls and samples the reference source full-range output voltage, and establishes a second mapping relation between the sampling voltage corresponding to each channel of the main sampling circuit and the auxiliary sampling circuit and the actual output voltage of the reference source calibration circuit, wherein the second mapping relation is expressed by a piecewise approximation function, and the relation is that Vt < 1 > = Vs x Ksn + Bsn; Wherein Vt1 is the actual output voltage of the reference source calibration circuit, vs is the sampling voltage of the sampling circuit, ksn and Bsn are the parameters of the piecewise function, and the main control unit stores the parameters, the piecewise points and the number of the piecewise functions of the relational expression.
5. The power calibration system of claim 2, wherein: The power calibration circuit collects actual output voltage of the full-range output of the power supply through the high-precision universal meter, and establishes a third mapping relation between the set output voltage and the actual output voltage of the power supply, wherein the third mapping relation is expressed by a piecewise approximation function, and the relation is vpt=Vc×Kpn+ Bpn; In the formula, vpt is the actual output voltage of the power supply, vc is the set output voltage of the power supply, kpn and Bpn are piecewise function parameters, and the main control unit stores the parameters, the piecewise points and the number of the pieces of the piecewise functions of the relational expression.
6. The power calibration system of claim 1, wherein: the change-over switch is a relay switch or a multiplexer.
7. A method of operating a power calibration system according to any one of claims 1 to 6, comprising the steps of: the method comprises the steps of S1, establishing a reference source mapping relation, namely controlling a reference source calibration circuit to start calibration, controlling a reference source to output full-range voltage, collecting actual output voltage of the reference source full-range output through a high-precision universal meter, and establishing and storing a first mapping relation between set output voltage and actual output voltage of the reference source; S2, establishing a mapping relation of a sampling circuit, namely controlling a sampling calibration circuit to start calibration by a main control unit, sequentially switching a main sampling circuit and a sub-sampling circuit to a reference source output end through a change-over switch based on accurate reference voltage provided by the first mapping relation, carrying out polling sampling on the full-range output voltage of the reference source, and establishing and storing a second mapping relation between sampling voltages corresponding to the main sampling circuit and the sub-sampling circuit of each channel and actual output voltage of the reference source calibration circuit; S3, sampling calibration circuit timing on-line calibration, namely, during the continuous normal operation of a power supply, a main control unit controls a change-over switch to switch and connect one path of a main sampling circuit and a sub-sampling circuit which are in an idle state to a reference source output end for calibration, updates a corresponding second mapping relation based on the first mapping relation, corrects sampling voltage based on the updated second mapping relation, obtains an accurate sampling value and feeds the accurate sampling value back to the main control unit, and simultaneously keeps the other sampling circuit in a normal output sampling state; S4, establishing a power output mapping relation, namely controlling a power calibration circuit to start calibration by the main control unit, controlling the power calibration circuit to output full-range voltage, collecting actual output voltage by the power calibration circuit through a high-precision universal meter, and establishing and storing a third mapping relation between set output voltage and actual output voltage of a power supply; and S5, fine-tuning the output voltage of the power supply in real time, wherein the main control unit fine-tunes the output voltage of the power calibration circuit in real time based on the third mapping relation between the accurate sampling value and the power calibration circuit.

Description

Power supply calibration system and working method thereof Technical Field The application belongs to the technical field of power supply calibration, and particularly relates to a power supply calibration system and a working method thereof. Background The multichannel high-precision power supply is a common core power supply unit of various precision electronic systems, and the stability and precision of the output voltage directly determine the performance index of the whole system, so that the power supply calibration is a key for guaranteeing the performance of the multichannel high-precision power supply. At present, for calibration of a multichannel power supply, as shown in fig. 5, a standard reference voltage output by a reference source is generally used as a calibration reference to perform primary calibration, after the primary calibration is completed, the calibration voltage is provided for a voltage stabilizer of a next stage, the voltage stabilizer performs secondary calibration based on the reference voltage, and feedback adjustment is performed on the final output voltage. Although the final output voltage precision can be theoretically ensured to be the initial calibration precision by the calibration scheme, the influence of temperature drift caused by environmental temperature change of electronic components and time drift caused by aging of the electronic components on the output precision is ignored in the operation process of the power supply, and after the power supply is operated for a long time, the output precision of a reference source and the detection precision of a sampling circuit can gradually deviate from the initial calibration value, so that the power supply output error is accumulated and becomes larger continuously, and long-term high-precision output cannot be maintained. In the prior art, in order to reduce the influence of temperature drift and time drift in long-time running of a power supply, the high-precision power supply applied to the fields of high-precision optical path power supplies and the like generally adopts high-precision stability devices to construct a core circuit of the power supply, but the cost of the components is higher, the temperature drift and time drift cannot be completely eliminated, the precision maintenance time can only be prolonged, the high-precision output time is limited, the reliability is not high, in addition, in order to prevent precision attenuation, the power supply needs to be powered off for initial calibration operation after a period of power supply running, the continuous running of a powered system is seriously influenced, and the production efficiency is reduced. Disclosure of Invention In order to solve or partially solve the problems existing in the related art, the application provides a power supply calibration system and a working method thereof, which can calibrate sampling circuits automatically and regularly on the premise of maintaining normal and continuous operation of a power supply, reliably compensate any temperature drift and time drift generated by each sampling circuit since the last calibration, correct sampling precision attenuation caused by the temperature drift and the time drift in real time, and effectively eliminate systematic errors caused by the temperature drift and the time drift of the sampling circuits so as to maintain long-term and continuous high-precision output of the power supply. The first aspect of the application provides a power supply calibration system, which comprises a reference source calibration circuit, a sampling calibration circuit, a power calibration circuit and a main control unit; the reference source calibration circuit is electrically connected with the main control unit and is used for establishing a first mapping relation between the set output voltage and the actual output voltage of the reference source and providing accurate reference voltage of a full range for the sampling calibration circuit; The sampling calibration circuit is electrically connected with the main control unit and the reference source calibration circuit and comprises at least one group of main sampling circuit, sub-sampling circuit and a change-over switch controlled by the control unit, wherein the sampling end of each sampling circuit is connected with the change-over switch, and in a calibration state, the change-over switch is switched to be connected with the output end of the reference source calibration circuit and is used for establishing a second mapping relation between the sampling voltage of each sampling circuit and the actual output voltage of the reference source calibration circuit based on the accurate reference voltage provided by the first mapping relation, so as to obtain an accurate sampling value of the power supply and prepare for adjusting the actual output voltage of the power supply; the power calibration circuit is electrically connected with the main control u