CN110955290A - Intelligent temperature compensation device for high-precision high-power converter - Google Patents

Abstract

The invention discloses an intelligent temperature compensation device for a high-precision and high-power converter, comprising: multiple temperature sampling units electrically connected in sequence, a precision and stability control unit, a curve loading unit and a digital PWM adjustment unit. The device can reduce the temperature coefficient index of the high-precision high-power converter to a level of less than 20ppm when working under the extreme ambient temperature, thereby greatly improving the output voltage and current accuracy; it can automatically adjust according to the corresponding relationship between the measured temperature and distribution parameters Control loop parameters, greatly improve the output stability in high and low temperature environment; with automatic calibration function of temperature drift curve, realize active communication and automatic execution with remote connected program-controlled voltmeter, program-controlled ammeter, programmable electronic load, and environmental test box Calibration and curve drawing; all compensation methods and processes are automated, intelligent, and unattended.

Description

Intelligent temperature compensation device for high precision and high power converter

technical field

The invention relates to the fields of AC and DC power supplies, electronic loads and high-power converter equipment, in particular to an intelligent temperature compensation device for high-precision high-power converters.

Background technique

In the fields of industrial equipment, information communication, measurement control, etc., various high-precision AC and DC stable power supplies and electronic loads are used in equipment development, maintenance support, and measurement testing. In recent years, with the continuous improvement of the level of industrialization technology, various comprehensive demands have been put forward for power supply, and environmental adaptability is one of the key indicators.

High-precision AC and DC stabilized power supplies are widely used; among them, the kilowatt-level high-performance series products are tested at an ambient temperature of 23°C±5°C, the output voltage programming and measurement accuracy can reach about 0.3‰, and the output current programming and measurement accuracy can reach 1‰ It can meet most applications. At present, the main problems of this type of power supply are: 1) The environmental adaptability requires a wide operating temperature range, mostly -40 to +60 °C. Even if it is calculated according to the 100ppm temperature drift coefficient required by high-performance power supplies, the power supply is in high and low temperature. When working in the environment, the output voltage and current accuracy will drop to the level of 5‰, which is several times or ten times the gap compared with normal temperature. 2) Most of the key component parameters change with the ambient temperature, which will deteriorate the output index and even cause oscillation, affecting reliability. The huge output difference of high-precision power converters in normal temperature and high and low temperature environments will seriously affect the application of precision equipment in complex environments; therefore, how to solve the above problems is the field of AC and DC power supplies, electronic loads and high-power converters and testing. Urgent problems.

SUMMARY OF THE INVENTION

Based on the existing problems in the prior art, the purpose of the present invention is to provide an intelligent temperature compensation device for high-precision high-power converters, which can solve the The accuracy of the output voltage and current of the power converter, etc. affects the reliability.

The purpose of this invention is to realize through the following technical solutions:

Embodiments of the present invention provide an intelligent temperature compensation device for a high-precision high-power converter, including:

Multiple temperature sampling units, precision and stability control units, curve loading units and digital PWM adjustment units; among them,

The multiple temperature sampling unit is provided with multiple sets of temperature sampling devices for connecting high-precision high-power converters, which can separately obtain temperature signals of different circuit parts of the high-precision high-power converters, and use the acquired high-precision high-power converters. The temperature signals of different circuit parts of the high-power converter are respectively normalized to form a crude temperature signal output;

The accuracy and stability control unit is electrically connected to the multiple temperature sampling unit and the curve loading unit, respectively, and can perform signal distribution processing and distinction on each crude temperature signal corresponding to different circuit parts output by the multiple temperature sampling unit processing, obtain the temperature signals corresponding to the current, internal environment, voltage, power switching device, magnetic element and second-order filter circuit respectively, and form a current temperature drift according to the temperature signals corresponding to the current and voltage respectively and the temperature signal corresponding to the internal environment characteristic curve and voltage temperature drift characteristic curve; according to the temperature signal corresponding to the power switching device, the magnetic element and the second-order filter circuit, the distribution parameter temperature drift characteristic curve is formed;

The curve loading unit is electrically connected to the accuracy and stability control unit and the digital PWM adjustment unit respectively, and can calibrate the current temperature drift characteristic curve and the voltage temperature drift characteristic curve output by the accuracy and stability control unit Then, the temperature drift characteristic curve of the distribution parameter and the output of the precision and stability control unit are loaded into the digital PWM adjustment unit;

The digital PWM adjustment unit is electrically connected to the curve loading unit and the high-precision high-power converter, respectively, and can be based on the current temperature drift characteristic curve, the voltage temperature drift characteristic curve and the distribution parameter temperature drift output by the curve loading unit The characteristic curve forms a PWM adjustment signal, and the high-precision high-power converter is controlled by the PWM adjustment signal.

It can be seen from the technical solutions provided by the present invention that the intelligent temperature compensation device for high-precision high-power converters provided by the embodiments of the present invention has the following beneficial effects:

By setting up multiple temperature sampling units, precision and stability control units, curve loading units and digital PWM adjustment units connected in sequence, it is possible to carry out effective temperature measurement on many important parts or components of high-precision and high-power converters. The comprehensive data processing of multiple measurement points, combined with the temperature drift and distribution parameter curves of automatic loading and calibration, can effectively adjust and control the PWM signal for compensating the reference input voltage and power switch, and finally realize the high-precision high-power converter in the limit When working at ambient temperature, it can achieve a temperature coefficient index of less than 20ppm, greatly improving the output voltage and current accuracy; the compensation device automatically adjusts the control loop parameters according to the corresponding relationship between the measured temperature and the distribution parameters, so as to greatly improve the performance in high and low temperature environments. Improve output stability; the compensation device can be automatically realized by hardware circuit and software control algorithm without manual setting and adjustment, and can realize intelligent temperature compensation.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic structural diagram of an intelligent temperature compensation device provided by an embodiment of the present invention;

2 is a schematic diagram of a process of crimping a temperature sensor, an output current precision sampling resistor, and a power switch device in the vicinity of the temperature sensor, respectively, in the multiple temperature sampling unit provided by the embodiment of the present invention;

3 is a schematic diagram of a flexible circuit sticking structure in a multiple temperature sampling unit provided by an embodiment of the present invention;

4 is a schematic diagram of an example of a sampling circuit in a multiple temperature sampling unit provided by an embodiment of the present invention;

5 is a schematic diagram of an input signal distribution circuit in an accuracy and stability control unit provided by an embodiment of the present invention;

6 is an oscilloscope interface diagram of the input signal distribution waveform in the accuracy and stability control unit provided by an embodiment of the present invention;

7 is a schematic diagram of a temperature drift curve of an output current precision sampling resistor σR/R provided by an embodiment of the present invention;

The components corresponding to each mark in the figure are: 1-multiple temperature sampling unit; 11-precision current feedback module; 12-internal ambient temperature feedback module; 13-output voltage feedback module; 14-power switch temperature module; 15-magnetic element temperature Module; 16-second-order filter temperature module; 2-precision and stability control unit; 21-output current precision control module; 22-internal ambient temperature control module; 23-output voltage precision control module; 24-stability control module; 3- Curve loading unit; 31- Temperature drift curve calibration module; 32- Temperature drift curve loading module; 33- Distributed parameter curve loading module; 4- Digital PWM adjustment unit; 5- High-precision high-power converter; A- Temperature Sensor; B-the bottom buried point of temperature sensor; C-radiator;.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the specific content of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention. Contents that are not described in detail in the embodiments of the present invention belong to the prior art known to those skilled in the art.

As shown in FIG. 1 , an embodiment of the present invention provides an intelligent temperature compensation device for a high-precision high-power converter, which can measure and control the entire high-precision high-power converter to achieve temperature compensation, including:

Multiple temperature sampling units, precision and stability control units, curve loading units and digital PWM adjustment units; among them,

The multiple temperature sampling unit is provided with multiple sets of temperature sampling devices for connecting high-precision high-power converters, which can separately obtain temperature signals of different circuit parts of the high-precision high-power converters, and use the acquired high-precision high-power converters. The temperature signals of different circuit parts of the high-power converter are respectively normalized to form a crude temperature signal output;

The accuracy and stability control unit is electrically connected to the multiple temperature sampling unit and the curve loading unit, respectively, and can perform signal distribution processing and distinction on each crude temperature signal corresponding to different circuit parts output by the multiple temperature sampling unit processing, obtain the temperature signals corresponding to the current, internal environment, voltage, power switching device, magnetic element and second-order filter circuit respectively, and form a current temperature drift according to the temperature signals corresponding to the current and voltage respectively and the temperature signal corresponding to the internal environment characteristic curve and voltage temperature drift characteristic curve; according to the temperature signal corresponding to the power switching device, the magnetic element and the second-order filter circuit, the distribution parameter temperature drift characteristic curve is formed;

The curve loading unit is electrically connected to the accuracy and stability control unit and the digital PWM adjustment unit respectively, and can calibrate the current temperature drift characteristic curve and the voltage temperature drift characteristic curve output by the accuracy and stability control unit Then, the temperature drift characteristic curve of the distribution parameter and the output of the precision and stability control unit are loaded into the digital PWM adjustment unit;

The digital PWM adjustment unit is electrically connected to the curve loading unit and the high-precision high-power converter, respectively, and can be based on the current temperature drift characteristic curve, the voltage temperature drift characteristic curve and the distribution parameter temperature drift output by the curve loading unit The characteristic curve forms a PWM adjustment signal, and the high-precision high-power converter is controlled by the PWM adjustment signal.

In the above temperature compensation device, the multiple temperature sampling units include:

Precision current feedback module, internal environment temperature feedback module, output voltage feedback module, power switch temperature module, magnetic element temperature module and second-order filter temperature module; among them,

The precision current feedback module, the internal environment temperature feedback module, the output voltage feedback module, the power switch temperature module, the magnetic element temperature module and the second-order filter temperature module are each provided with a set of temperature sampling devices;

Each group of temperature sampling devices of the precision current feedback module, the internal environment temperature feedback module, the output voltage feedback module, the power switch temperature module, the magnetic element temperature module and the second-order filter temperature module are respectively connected to the high-precision high-power converter At the output current precision sampling resistor, loop control circuit, output voltage feedback circuit, power switching device, magnetic element, and second-order filter circuit, the output current precision sampling resistor, loop control circuit, and output voltage feedback circuit can be collected separately. , Power switching devices, magnetic components, the temperature signal of each circuit part of the second-order filter circuit.

In the above temperature compensation device, the precision current feedback module, the internal environment temperature feedback module, the output voltage feedback module, the power switch temperature module, the magnetic element temperature module and the second-order filter temperature module all use temperature sampling circuits.

In the above temperature compensation device, the temperature sampling device of the precision current feedback module adopts a temperature sensor, and the temperature sensor is connected to the aluminum base radiator connected to the output current precision sampling resistor through the radiator crimping or burying the radiator. ;

The temperature sampling device of the power switch temperature module adopts a temperature sensor, and the temperature sensor is connected to the aluminum base radiator connected to the power switch device by crimping or burying the radiator in the vicinity of the radiator;

The temperature sampling device of the inner environment temperature feedback module adopts two temperature sensors, wherein one temperature sensor is arranged on the surface of the printed circuit board of the loop control circuit, and the other temperature sensor is arranged on the surface of the loop control circuit. In the space around the printed circuit board; two temperature sensors measure the surface temperature of the printed circuit board and the ambient temperature of the space around the circuit respectively, and finally convert the influence factor through the weight of each circuit; Depending on the structure of high-power converters, multiple temperature sensors (such as multiple places on the surface of the circuit board and multiple places in the chassis) are installed, and the temperature of multiple environments is measured at the same time (a single internal ambient temperature is obtained by averaging, comparing or weighting), to obtain a more accurate internal ambient temperature.

The temperature sampling device of the output voltage feedback module adopts two temperature sensors, wherein one temperature sensor is arranged on the surface of the printed circuit board of the output voltage feedback circuit, and the other temperature sensor is arranged on the printed circuit board of the output voltage feedback circuit. In the space around the circuit board; two temperature sensors measure the surface temperature of the printed board and the ambient temperature of the space around the circuit respectively, and finally convert the impact factor through the weight of each circuit;

The temperature sampling device of the power switch temperature module adopts a temperature sensor with a hollow structure at the bottom, the temperature sensor is arranged on the flexible circuit sticking structure, and the flexible circuit sticking structure is wound on the surface of the power switch device whose temperature is to be measured. ;

The temperature sampling device of the magnetic element temperature module adopts a temperature sensor with a hollow structure at the bottom, the temperature sensor is arranged on the flexible circuit sticking structure, and the flexible circuit sticking structure is wound on the surface of the magnetic element whose temperature is to be measured;

The temperature sampling device of the second-order filter temperature module adopts a temperature sensor with a hollow structure at the bottom, the temperature sensor is arranged on the flexible circuit sticking structure, and the flexible circuit sticking structure is wound around the second-order filter of the temperature to be measured. The surface of the filter electrolytic capacitor of the circuit.

Through this flexible circuit attachment structure and the hollowed-out temperature sensor at the bottom, the surface temperature of cylindrical devices (such as electrolytic capacitors and other devices) can be measured more accurately, and accurate parameters can be provided for subsequent temperature compensation control.

In the above temperature compensation device, the accuracy and stability control unit includes:

Input signal distribution circuit, temperature discrimination processing module, output current precision control module, internal environment temperature control module, output voltage precision control module and stability control module; among them,

The input signal distribution circuit is electrically connected with the multiple temperature sampling units, and is respectively connected with the output current accuracy control module, the internal environment temperature control module, the output voltage accuracy control module and the stability control module through the temperature discrimination processing module The modules are electrically connected, so that each crude temperature signal output by the multiple temperature sampling units can be processed by signal distribution, and then sent to the temperature discrimination processing module to be processed by comparing the size and/or weight, and then correspondingly allocated to the output. Current precision control module, internal environment temperature control module, output voltage precision control module and stability control module;

The internal environment temperature control module is electrically connected to the output current accuracy control module and the output voltage accuracy control module, respectively, and can receive temperature signals corresponding to the differentiated and processed internal environment, and respectively control the output current accuracy. module and the output voltage precision control module output;

The output current precision control module can obtain the temperature signal corresponding to the current according to the differentially processed output current precision sampling resistor and the temperature signal corresponding to the internal environment respectively;

The output voltage accuracy control module can obtain the temperature signal corresponding to the voltage according to the temperature signal corresponding to the output voltage feedback circuit and the internal environment after distinguishing processing;

The stability control module can obtain the temperature signal corresponding to the distribution parameter according to the temperature signals corresponding to the power switch device, the magnetic element and the second-order filter circuit after the differential processing. The stability control module has two functions, one is in the calibration link, the output signal of the module provides discrete input for the temperature drift curve calibration module in the subsequent curve loading unit; The real-time temperature data related to the performance control function is an important parameter for the high-precision high-power converter to work stably.

In the above temperature compensation device, the input signal distribution circuit includes: a high-speed analog switch multi-channel serial selection circuit, a high-precision differential operational amplifier and a differential analog-to-digital converter that are electrically connected.

In the above temperature compensation device, the curve loading unit includes:

temperature drift curve calibration module, temperature drift curve loading module and distribution parameter curve loading module; among them,

The temperature drift curve calibration module is electrically connected to the accuracy and stability control unit and the temperature drift curve loading module, and can communicate automatically with remotely connected program-controlled voltmeters, program-controlled ammeters, programmable electronic loads, and environmental test chambers. Calibrating the current temperature drift characteristic curve and the voltage temperature drift characteristic curve received from the accuracy and stability control unit, and sending the calibrated current temperature drift characteristic curve and voltage temperature drift characteristic curve to the temperature drift curve for loading module, the characteristic quantities corresponding to the current temperature drift characteristic curve and the voltage temperature drift characteristic curve are respectively the output current precision sampling resistance σR/R and the output voltage σU/ _Uset ;

The temperature drift curve loading module is electrically connected to the temperature drift curve calibration module and the digital PWM adjustment unit respectively, and can receive the current temperature drift characteristic curve and the voltage temperature drift characteristic from the temperature drift curve calibration module The curve is loaded into the digital PWM adjustment unit;

The distribution parameter curve loading module is electrically connected to the accuracy and stability control unit and the digital PWM adjustment unit respectively, and can receive the distribution parameter temperature drift characteristic curve from the accuracy and stability control unit Loaded into the digital PWM adjustment unit; the characteristic quantity corresponding to the temperature drift characteristic curve of the distribution parameter is the equivalent series internal resistance ESR of the distribution parameter.

In the above temperature compensation device, the digital PWM adjustment unit can pass the current temperature drift characteristic curve corresponding to the actual temperature value of the high-precision high-power converter (the actual temperature value is the temperature value measured by the multiple temperature sampling units). , voltage temperature drift characteristic curve and distributed parameter temperature drift characteristic curve to calibrate the three characteristic quantities corresponding to the current temperature drift characteristic curve, voltage temperature drift characteristic curve and distributed parameter temperature drift characteristic curve, and the three characteristic quantities after calibration are obtained as The output current precision sampling resistance value, the output voltage compensation value σU, the distribution parameter equivalent series internal resistance ESR, and the output current is determined according to the preset parameters and topology characteristic parameters of the high-precision high-power converter through the three calibrated characteristic quantities. set value, output voltage set value and digital loop compensation parameters k _p , k _i , k _d , and according to the obtained output current set value, output voltage set value and digital loop compensation parameters k _p , k _i and k _d generate a PWM adjustment signal, and control the high-precision high-power converter through the PWM adjustment signal. It makes the output voltage and current of the high-precision high-power converter less affected by temperature and has a low temperature drift coefficient.

The temperature compensation device of the invention can realize the calibration of the current, voltage and distribution parameters, and further realize the temperature compensation control of the high-precision high-power converter under two working states of steady state and transient state, so that it has lower temperature drift. coefficient to ensure higher output accuracy.

The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Referring to FIG. 1, in the above temperature compensation device, the multiple temperature sampling units respectively measure the output current precision sampling resistor, loop control circuit, output voltage feedback circuit, power switching device, magnetic element, and second-order filter in the high-precision high-power converter. The key parts of the circuit conduct temperature sampling to obtain temperature signals;

Since most of the output current precision sampling resistors and power switching devices are installed on the aluminum-based heat sink, for these two devices under test, the temperature sensor can be packaged in TO-220 or TO-247. Process" to set the temperature sensor, as shown in Figure 2; the temperature sensor of the lead package can also be selected, and the "heat sink buried point process" is used to set the temperature sensor.

Since the loop control circuit and the output voltage feedback circuit are specific circuits welded on the printed circuit board, and the variation of the power loss of the circuit is small, each circuit is equipped with two temperature sensors to measure the surface temperature of the printed circuit board and the temperature respectively. The temperature of the space around the circuit. The temperature sensor packages are SO-8 and TO-92, or similar packages. Finally, the influence factor is converted by the weight of each circuit, and the weight is the ratio of the circuit error to the output voltage error; the measured temperature is decreased by "the square of the distance between the printed board test point and the specific circuit", and compared with the ambient temperature, take maximum value.

Because of the magnetic components and the key parts of the second-order filter circuit, especially the output filter electrolytic capacitor of the converter, it is difficult to measure the surface temperature because of its cylindrical structure. As shown in Figure 3, specifically, a thick-film flexible circuit board D with locking contacts F is set as the flexible circuit attaching structure, and the surface-mount packaged temperature sensor E is arranged in the center of the circuit board by using the thick-film flexible circuit board, The bottom position of the temperature sensor in the circuit board is hollowed out and coated with insulating and thermally conductive silicone grease. The thick-film flexible circuit board is attached to the surface of the electrolytic capacitor perpendicular to the axial direction, and is spot welded firmly through the locking contacts; the thick-film flexible circuit board is plugged into the main board through the gold finger port. on the circuit board. This "flexible circuit application process" solves the problem that the surface temperature of electrolytic capacitors is not easy to measure, and has the advantages of high temperature measurement accuracy and fast speed, and establishes a basis for the subsequent determination of ESR, ESL and other distribution parameters through surface temperature conversion.

Specifically, the circuit composition of the multiple temperature sampling unit is shown in Figure 4 (but not limited to the circuit listed in Figure 4), because the temperature sensor types selected by the unit are different, the circuit needs to normalize the sampling voltage, because each temperature sensor There are more than one temperature sensor for the key parts or components to be tested, and the circuit can use normalization processing methods such as maximum value, average value, weighted average, etc. to obtain the final measured temperature signal, which is used for further data processing by the accuracy and stability control unit. ready.

In the above temperature compensation device, the precision and stability control unit includes: an input signal distribution circuit, an output current precision control module, an internal environment temperature control module, an output voltage precision control module and a stability control module; the precision and stability control unit The main function is to further process and redistribute the normalized rough signals input by the multiple temperature sampling units according to different functions and weights, and transmit them to the microprocessors of each module in a differential manner (which can be the microprocessors independently set by each module. controller, or a shared microprocessor). Among them, the input signal distribution circuit is respectively electrically connected with the output current precision control module, the internal environment temperature control module, the output voltage precision control module and the stability control module; the output current precision control module mainly deals with the output current precision sampling resistance and the internal environment. The temperature signal; the output voltage accuracy control module mainly deals with three temperature signals of the loop control circuit, the output voltage feedback circuit and the internal environment; the stability control module mainly deals with the temperature signals of key parts such as power switching devices, magnetic components, and second-order filter circuits. .

Specifically, the input signal distribution circuit of the above-mentioned precision and stability control unit is shown in Figure 5 (but not limited to the circuit listed in Figure 5); the circuit selects multiple signals in series through high-speed analog switches, and passes through high-precision differential operational amplifiers. Perform common mode rejection and signal source processing, and finally input the differential analog-to-digital converter to the microprocessor. This design uses a set of circuit structure to complete 8 groups of signal transmission, which has the advantages of signal isolation, high common mode rejection ratio and simple structure. The transmission effect is shown in Figure 6. It can be seen from Figure 6 that the transmission period of each signal is only 20μs; in practical applications, this circuit is used to deal with different high-precision high-power converters. The shortest transmission period can be reduced to 1μs, which can meet the sampling transmission requirements of most power supplies.

In the above-mentioned temperature compensation device, the curve loading unit includes: a temperature drift curve calibration module, a temperature drift curve loading module and a distribution parameter curve loading module; characteristic curve, internal environment temperature drift characteristic curve and voltage temperature drift characteristic curve) are loaded into the temperature compensation device; the main characteristic quantities corresponding to the above three curves are "output current precision sampling resistance σR/R", "output voltage σU/U _set ” and “Distributed Parameter Equivalent Series Internal Resistance ESR”. The built-in microprocessor calibration circuit of the temperature drift curve calibration module provides a wealth of communication interfaces such as USB, LAN, GPIB, RS485, etc., and is remotely connected to the program-controlled voltmeter, program-controlled ammeter, programmable electronic load, and environmental test box through the communication interface; Voltmeter, program-controlled current and voltage read the actual output voltage and current value, and the environmental test box and programmable electronic load provide different internal temperature values for calibration; Program the electronic load and the environmental test box to communicate actively and automatically perform calibration and curve drawing; Figure 7 is a schematic diagram of the "output current precision sampling resistance σR/R" curve, which will be converted into identifiable list data and stored during loading; At this point, all the external conditions required for temperature compensation have been met, and the data is aggregated to the digital PWM adjustment unit.

In the above temperature compensation device, the digital PWM adjustment unit is the final calculation and execution unit; the digital PWM adjustment unit calibrates the main characteristic quantities through the actual temperature value and the corresponding temperature drift curve, and the characteristic quantities include "output current precision sampling resistor". value”, “output voltage compensation value σU” and “distributed parameter equivalent series internal resistance ESR parameter”; these three main characteristic quantities will determine the “output current setting” according to the preset parameters and topology characteristic parameters of the high-precision high-power converter value", "output voltage setting value" and "digital loop compensation parameters k _p , k _i , k _d "; the unit circuit generates a PWM adjustment signal according to the above three values to drive the high-precision high-power converter, and finally make the high The output voltage and current of the high-precision high-power converter have low temperature drift coefficient and high stability.

The intelligent temperature compensation device of the present invention has at least the following beneficial effects:

1) It can reduce the temperature coefficient index of the high-precision high-power converter to a level of less than 20ppm when working under extreme ambient temperature, thereby greatly improving the output voltage and current accuracy;

2) According to the corresponding relationship between the measured temperature and the distribution parameters, the control loop parameters can be automatically adjusted, thereby greatly improving the output stability in high and low temperature environments;

3) The adopted "flexible circuit sticking structure" solves the problem that the output filter electrolytic capacitor of the converter cannot provide accurate parameters for temperature compensation control because of its cylindrical structure, which makes it difficult to measure the surface temperature;

4) It has the function of automatic calibration of temperature drift curve, realizes active communication with remote connected program-controlled voltmeter, program-controlled ammeter, programmable electronic load, and environmental test box, and automatically performs calibration and curve drawing;

5) All compensation and control processes can be automated and intelligent, and can be unattended.

The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (8)

1. An intelligent temperature compensation device for a high-precision high-power converter, comprising:

the device comprises a multiple temperature sampling unit, a precision and stability control unit, a curve loading unit and a digital PWM (pulse width modulation) adjusting unit; wherein,

the multiple temperature sampling unit is provided with a plurality of groups of temperature sampling devices for connecting the high-precision high-power converter, can respectively acquire temperature signals of different circuit parts of the high-precision high-power converter, and respectively normalizes the acquired temperature signals of the different circuit parts of the high-precision high-power converter to form a rough temperature signal for output;

the precision and stability control unit is respectively electrically connected with the multiple temperature sampling unit and the curve loading unit, can perform signal distribution processing and distinguishing processing on each rough temperature signal corresponding to different circuit parts output by the multiple temperature sampling unit to respectively obtain temperature signals corresponding to current, an internal environment, voltage, a power switch device, a magnetic element and a second-order filter circuit, and forms a current temperature drift characteristic curve and a voltage temperature drift characteristic curve according to the temperature signals corresponding to the current and the voltage respectively and the temperature signals corresponding to the internal environment; forming a distribution parameter temperature drift characteristic curve according to the temperature signals corresponding to the power switch device, the magnetic element and the second-order filter circuit;

the curve loading unit is respectively electrically connected with the precision and stability control unit and the digital PWM adjusting unit, and can load the current temperature drift characteristic curve and the voltage temperature drift characteristic curve output by the precision and stability control unit and the distribution parameter temperature drift characteristic curve output by the precision and stability control unit to the digital PWM adjusting unit after calibrating the current temperature drift characteristic curve and the voltage temperature drift characteristic curve;

the digital PWM adjusting unit is respectively electrically connected with the curve loading unit and the high-precision high-power converter, can form PWM adjusting signals according to the current temperature drift characteristic curve, the voltage temperature drift characteristic curve and the distribution parameter temperature drift characteristic curve output by the curve loading unit, and controls the high-precision high-power converter through the PWM adjusting signals.

2. The intelligent temperature compensation device for high-precision high-power converter according to claim 1, wherein the multiple temperature sampling unit comprises:

the device comprises a precision current feedback module, an internal environment temperature feedback module, an output voltage feedback module, a power switch temperature module, a magnetic element temperature module and a second-order filtering temperature module; wherein,

the precise current feedback module, the internal environment temperature feedback module, the output voltage feedback module, the power switch temperature module, the magnetic element temperature module and the second-order filtering temperature module are respectively provided with a group of temperature sampling devices;

the temperature sampling devices of the precision current feedback module, the internal environment temperature feedback module, the output voltage feedback module, the power switch temperature module, the magnetic element temperature module and the second-order filtering temperature module are respectively connected to the output current precision sampling resistor, the loop control circuit, the output voltage feedback circuit, the power switch device, the magnetic element and the second-order filtering circuit of the high-precision high-power converter, and can respectively collect temperature signals of circuit parts of the output current precision sampling resistor, the loop control circuit, the output voltage feedback circuit, the power switch device, the magnetic element and the second-order filtering circuit.

3. The intelligent temperature compensation device for high-precision high-power converter according to claim 2, wherein the precision current feedback module, the internal environment temperature feedback module, the output voltage feedback module, the power switch temperature module, the magnetic element temperature module and the second-order filtering temperature module all adopt temperature sampling circuits.

4. The intelligent temperature compensation device for the high-precision high-power converter according to claim 2 or 3, wherein the temperature sampling device of the precision current feedback module adopts a temperature sensor, and the temperature sensor is connected to the aluminum-based radiator connected with the output current precision sampling resistor through a radiator nearby compression joint or a radiator embedded point;

the temperature sampling device of the power switch temperature module adopts a temperature sensor which is connected to an aluminum-based radiator connected with the power switch device in a manner of nearby crimping of the radiator or embedding of the radiator;

the temperature sampling device of the internal environment temperature feedback module adopts two temperature sensors, wherein one temperature sensor is arranged on the surface of a printed circuit board of the loop control circuit, and the other temperature sensor is arranged in the space around the printed circuit board of the loop control circuit;

the temperature sampling device of the output voltage feedback module adopts two temperature sensors, wherein one temperature sensor is arranged on the surface of a printed circuit board of the output voltage feedback circuit, and the other temperature sensor is arranged in the space around the printed circuit board of the output voltage feedback circuit;

the temperature sampling device of the power switch temperature module adopts a temperature sensor with a hollow structure at the bottom, the temperature sensor is arranged on a flexible circuit attaching structure, and the flexible circuit attaching structure is wound on the surface of a power switch device with the temperature to be measured;

the temperature sampling device of the magnetic element temperature module adopts a temperature sensor with a hollow structure at the bottom, the temperature sensor is arranged on a flexible circuit attaching structure, and the flexible circuit attaching structure is wound on the surface of a magnetic element with the temperature to be measured;

the temperature sampling device of the second-order filtering temperature module adopts a temperature sensor with a hollow-out structure at the bottom, the temperature sensor is arranged on a flexible circuit attaching structure, and the flexible circuit attaching structure is wound on the surface of a filtering electrolytic capacitor of a second-order filtering circuit of which the temperature is measured.

5. The intelligent temperature compensation device for high-precision high-power converter according to any one of claims 1 to 3, wherein the precision and stability control unit comprises:

the device comprises an input signal distribution circuit, a temperature distinguishing and processing module, an output current precision control module, an internal environment temperature control module, an output voltage precision control module and a stability control module; wherein,

the input signal distribution circuit is electrically connected with the multiple temperature sampling units, is respectively and electrically connected with the output current precision control module, the inner environment temperature control module, the output voltage precision control module and the stability control module through the temperature distinguishing and processing module, and can correspondingly distribute the rough temperature signals output by the multiple temperature sampling units to the output current precision control module, the inner environment temperature control module, the output voltage precision control module and the stability control module after signal distribution processing and comparison and/or weight distinguishing processing of the rough temperature signals to the temperature distinguishing and processing module;

the internal environment temperature control module is respectively electrically connected with the output current precision control module and the output voltage precision control module, can receive temperature signals corresponding to the internal environment after the distinguishing processing, and respectively outputs the temperature signals to the output current precision control module and the output voltage precision control module;

the output current precision control module can obtain temperature signals corresponding to the current according to the temperature signals respectively corresponding to the output current precision sampling resistor and the internal environment after the distinguishing processing;

the output voltage precision control module can obtain temperature signals corresponding to voltages according to the temperature signals respectively corresponding to the output voltage feedback circuit and the internal environment after the distinguishing processing;

the stability control module can obtain temperature signals corresponding to distribution parameters according to the temperature signals respectively corresponding to the power switch device, the magnetic element and the second-order filter circuit after the distinguishing processing.

6. The intelligent temperature compensation device for high-precision high-power converter according to claim 5, wherein the input signal distribution circuit comprises: the high-speed analog switch multi-path serial selection circuit, the high-precision differential operational amplifier and the differential analog-to-digital converter are electrically connected.

7. The intelligent temperature compensation device for high-precision high-power converter according to any one of claims 1 to 3, wherein the curve loading unit comprises:

the temperature drift calibration module, the temperature drift curve loading module and the distribution parameter curve loading module are connected with the temperature drift calibration module; wherein,

the temperature drift curve calibration module is electrically connected with the precision and stability control unit and the temperature drift curve loading module, can automatically calibrate and follow the current temperature drift characteristic curve and the voltage temperature drift characteristic curve received by the precision and stability control unit through the communication with a remotely connected program-controlled voltmeter, a program-controlled ammeter, a programmable electronic load and an environmental test box, and sends the calibrated current temperature drift characteristic curve and the voltage temperature drift characteristic curve to the temperature drift curve loading module, and the characteristic quantities corresponding to the current temperature drift characteristic curve and the voltage temperature drift characteristic curve are respectively output current precision sampling resistance sigma R/R and output voltage sigma U/U_set；

The temperature drift curve loading module is respectively electrically connected with the temperature drift curve calibration module and the digital PWM adjusting unit and can load the current temperature drift characteristic curve and the voltage temperature drift characteristic curve received from the temperature drift curve calibration module to the digital PWM adjusting unit;

the distribution parameter curve loading module is respectively electrically connected with the precision and stability control unit and the digital PWM adjusting unit and can load the distribution parameter temperature drift characteristic curve received from the precision and stability control unit to the digital PWM adjusting unit; and the characteristic quantity corresponding to the distribution parameter temperature drift characteristic curve is distribution parameter equivalent series internal resistance (ESR).

8. The intelligent temperature compensation device for high-precision high-power converter according to any one of claims 1 to 3, wherein the digital PWM adjusting unit is capable of calibrating the current temperature drift characteristic curve, the voltage temperature drift characteristic curve and the distribution parameter temperature drift characteristic curve according to the current temperature drift characteristic curve, the voltage temperature drift characteristic curve and the distribution parameter temperature drift characteristic curve corresponding to the actual temperature value of the high-precision high-power converterObtaining three characteristic quantities corresponding to the digital temperature drift characteristic curve, wherein the obtained three calibrated characteristic quantities are respectively an output current precision sampling resistance value, an output voltage compensation value sigma U and a distribution parameter equivalent series internal resistance ESR, and determining according to the fixed parameters and the topological characteristic parameters of the high-precision high-power converter through the three calibrated characteristic quantities to obtain an output current set value, an output voltage set value and a digital loop compensation parameter k_p、k_i、k_dAnd according to the obtained set value of the output current, the set value of the output voltage and the digital loop compensation parameter k_p、k_i、k_dAnd generating a PWM (pulse-width modulation) adjusting signal, and controlling the high-precision high-power converter through the PWM adjusting signal.

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