CN112751377A - Power supply control system and method based on temperature compensation - Google Patents
Power supply control system and method based on temperature compensation Download PDFInfo
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- CN112751377A CN112751377A CN201911053680.2A CN201911053680A CN112751377A CN 112751377 A CN112751377 A CN 112751377A CN 201911053680 A CN201911053680 A CN 201911053680A CN 112751377 A CN112751377 A CN 112751377A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
Abstract
The invention discloses a power supply control system and method based on temperature compensation, which relate to the technical field of power supplies, and the system comprises: a primary power supply array and a secondary power supply array; the main power supply array and the auxiliary power supply array are composed of a plurality of power supplies which are connected in series with each other in a block chain network structure; the system further comprises: the device comprises a main power supply array monitoring and protecting circuit unit, an auxiliary power supply array monitoring and protecting circuit unit, a double-path charging management and monitoring unit, a double-path discharging management and monitoring unit and a multi-path switching circuit unit; the main power supply array monitoring and protecting unit is respectively connected with the main power supply array, the two-way charging management monitoring unit and the multi-way switching circuit unit; and the auxiliary power supply array monitoring and protecting circuit unit is respectively connected with the auxiliary power supply array, the two-way discharge management monitoring unit and the multi-way switching circuit unit. Has the advantages of high charging and discharging efficiency and good charging and discharging effect.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a power supply control system and method based on temperature compensation.
Background
The so-called temperature compensation allows the reference temperature at the free end of the temperature sensor to be more appropriate. Most temperature sensors require temperature compensation, and a common temperature compensation method is a bridge compensation method.
In some electronic products, some electronic components with positive and negative temperature coefficients are used, and taking resistance as an example, the positive temperature coefficient increases with temperature, the resistance value increases, and the negative temperature coefficient is just opposite. When the temperature coefficient sensor is applied to a sensor, if an element with a temperature coefficient is used alone, the error is relatively large, and if the elements with positive and negative temperature coefficients are combined, the positive and negative phases are balanced, and the error is relatively small.
The pulse charging method not only follows the inherent charge acceptance rate of the storage battery, but also can improve the charge acceptance rate of the storage battery, thereby breaking the limitation of the exponential charge acceptance curve of the storage battery, which is a new development of the storage battery charging theory. The pulse charging mode is to charge the battery with pulse current first, and then stop charging the battery for a period of time, and the process is repeated. The charging pulse makes the accumulator fully charged, and the intermittent period makes the oxygen and hydrogen produced by chemical reaction in the accumulator have time to recombine and be absorbed, so that the concentration polarization and ohmic polarization can be eliminated naturally, and the internal pressure of the accumulator can be reduced, and the constant-current charging of next round can be implemented more smoothly, and the accumulator can absorb more electric quantity. The intermittent pulse enables the storage battery to have sufficient reaction time, reduces the gas evolution quantity and improves the charge current acceptance rate of the storage battery.
The charging method is based on constant current charging and pulse charging. The characteristic is that the constant current charging section is changed into voltage-limiting variable current intermittent charging section. Each section in the early stage of charging adopts a variable current intermittent charging method, so that the charging current is ensured to be increased, and most of charging quantity is obtained. And in the later charging stage, a constant-voltage charging section is adopted to obtain the overcharge amount and restore the battery to a fully charged state. By intermittently stopping charging, the oxygen and hydrogen generated by the chemical reaction of the storage battery have time to recombine and be absorbed, so that concentration polarization and ohmic polarization are naturally eliminated, the internal pressure of the storage battery is reduced, the constant-current charging of the next round can be smoothly carried out, and the storage battery can absorb more electric quantity.
However, in the prior art, a single charging mode is often adopted, and once a charging and discharging process is started, the charging and discharging process is difficult to control, so that the charging and discharging effects are poor.
Disclosure of Invention
In view of this, the present invention provides a power control system and method based on temperature compensation, which has the advantages of high charging and discharging efficiency and good charging and discharging effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a temperature compensation based power control system, the system comprising: a primary power supply array and a secondary power supply array; the main power supply array and the auxiliary power supply array are composed of a plurality of power supplies which are connected in series with each other in a block chain network structure; the system further comprises: the device comprises a main power supply array monitoring and protecting circuit unit, an auxiliary power supply array monitoring and protecting circuit unit, a double-path charging management and monitoring unit, a double-path discharging management and monitoring unit and a multi-path switching circuit unit; the main power supply array monitoring and protecting unit is respectively connected with the main power supply array, the two-way charging management monitoring unit and the multi-way switching circuit unit; and the auxiliary power supply array monitoring and protecting circuit unit is respectively connected with the auxiliary power supply array, the two-way discharge management monitoring unit and the multi-way switching circuit unit.
Further, the main power array monitoring protection circuit unit includes: the current-sharing circuit comprises a current sampling circuit, a voltage sampling circuit, a current-sharing circuit, a current limiting circuit and a voltage amplifier; the current sampling circuit is connected with the current equalizing circuit; the current equalizing circuit is connected with the current limiting circuit; the voltage sampling circuit is connected with the voltage amplifier.
Furthermore, the two-way charging management monitoring unit comprises a current-equalizing voltage reference unit, a sampling conditioning unit, a PWM control unit, a double-tube driving unit, a synchronous voltage reduction unit, a current sampling unit and a voltage sampling unit; the main power supply array charges the auxiliary power supply array through the two synchronous voltage reduction units respectively, in the charging process, the charging current and the charging voltage of the auxiliary power supply array are sampled in real time through the current sampling unit and the voltage sampling unit respectively, meanwhile, the main power supply array drives the sampling conditioning unit to receive sampling data through the current-equalizing voltage reference unit, the sampling conditioning unit controls the PWM control unit respectively after being divided into two paths, and then the charging current and the charging voltage are adjusted through the double-tube driving unit respectively, so that the voltage of the auxiliary power supply array and the height of the current are consistent.
Furthermore, the two-way discharge management monitoring unit comprises a current mirror image sampling circuit unit, a current equalizing MOS (metal oxide semiconductor) tube, a current equalizing MOS tube, a current equalizing voltage reference unit, a discharge current equalizing unit and a DC-DC power supply unit; the current mirror image sampling circuit unit respectively samples and monitors the discharge current of the secondary power supply array, the discharge current is compared with the current-sharing voltage reference unit, the voltage drop on the DSON resistance value when the current-sharing MOS tubes are switched on in the discharge process is monitored, and when the discharge currents of two groups of batteries are inconsistent, the discharge current of the batteries is linearly adjusted by controlling the switching-on degree of the external current-sharing MOS tubes through the output signals of the current-sharing unit, so that current-sharing discharge of the two secondary power supply arrays is achieved.
Furthermore, the double-circuit charging management monitoring unit monitors the charging voltage and the charging current of the battery and simultaneously monitors the discharging voltage and the discharging current of the battery by combining the double-circuit discharging management monitoring unit, so that the charging and the discharging of the battery are combined.
An electric eye control method based on temperature compensation, the method performing the steps of:
step 1: the main power supply array monitoring protection circuit unit monitors a main power supply array, and the auxiliary power supply array monitoring protection circuit unit monitors an auxiliary power supply array;
step 2: according to the monitoring result, the multi-path switching circuit unit performs circuit switching and controls charging and discharging of the system;
and step 3: the double-circuit charging management monitoring unit controls the circuit to charge; and the two-way discharge management monitoring unit controls the circuit to discharge.
Further, the method further comprises the step of performing temperature compensation of the system; temperature compensation is achieved by employing a temperature compensation system comprising: the pressure sensor comprises a pressure sensing unit, a pressure signal amplifier, a temperature signal amplifier, a multiplexing switch, an A/D conversion unit and a processor; the pressure sensing unit consists of a pressure sensor and a temperature compensation resistor, and the temperature compensation resistor is connected to the excitation end of the pressure sensor; the temperature signal amplifier is connected with the exciting end of the pressure sensing unit, the pressure signal amplifier is connected with the signal output end of the pressure sensing unit, the pressure signal amplifier and the temperature signal amplifier are connected with the A/D conversion unit through a multiplexing switch, and the A/D conversion unit is connected with the processor; the main power supply array or the auxiliary power supply array provides exciting current for the pressure sensor, the temperature compensation resistor performs temperature compensation on the pressure sensor, the pressure sensing unit detects pressure and temperature signals and converts the pressure and temperature signals into voltage signals, the pressure signal amplifier and the temperature signal amplifier amplify the pressure and temperature signals, the A/D conversion unit converts analog signals into digital signals and sends the digital signals to the processor, and the processor processes the signals.
Compared with the prior art, the invention has the following beneficial effects: good electromagnetic compatibility is realized through shielding, filtering and filter design; and the temperature compensation circuit realizes good temperature drift control and improves the control and detection precision. The power management system has small volume, low power consumption and strong reliability, and solves the problems of high precision control requirement and difficult temperature drift control when the power management equipment is used for charge-discharge control and detection conditioning.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
fig. 1 is a schematic system structure diagram of a power control system based on temperature compensation according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart of a method for controlling a power supply based on temperature compensation according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1 and fig. 2. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Example 1
A temperature compensation based power control system, the system comprising: a primary power supply array and a secondary power supply array; the main power supply array and the auxiliary power supply array are composed of a plurality of power supplies which are connected in series with each other in a block chain network structure; the system further comprises: the device comprises a main power supply array monitoring and protecting circuit unit, an auxiliary power supply array monitoring and protecting circuit unit, a double-path charging management and monitoring unit, a double-path discharging management and monitoring unit and a multi-path switching circuit unit; the main power supply array monitoring and protecting unit is respectively connected with the main power supply array, the two-way charging management monitoring unit and the multi-way switching circuit unit; and the auxiliary power supply array monitoring and protecting circuit unit is respectively connected with the auxiliary power supply array, the two-way discharge management monitoring unit and the multi-way switching circuit unit.
Specifically, the system for achieving current sharing by serially connecting resistors has high power consumption and poor stability and flexibility. And meanwhile, a current acquisition module is also needed, so that the cost of the system is higher. Under the conditions of high requirements on system stability, large-current discharge and strict limitation on system power consumption overhead, the method becomes impractical.
Example 2
On the basis of the above embodiment, the main power array monitoring protection circuit unit includes: the current-sharing circuit comprises a current sampling circuit, a voltage sampling circuit, a current-sharing circuit, a current limiting circuit and a voltage amplifier; the current sampling circuit is connected with the current equalizing circuit; the current equalizing circuit is connected with the current limiting circuit; the voltage sampling circuit is connected with the voltage amplifier.
Example 3
On the basis of the previous embodiment, the two-way charging management monitoring unit comprises a current-equalizing voltage reference unit, a sampling conditioning unit, a PWM control unit, a double-tube driving unit, a synchronous voltage reduction unit, a current sampling unit and a voltage sampling unit; the main power supply array charges the auxiliary power supply array through the two synchronous voltage reduction units respectively, in the charging process, the charging current and the charging voltage of the auxiliary power supply array are sampled in real time through the current sampling unit and the voltage sampling unit respectively, meanwhile, the main power supply array drives the sampling conditioning unit to receive sampling data through the current-equalizing voltage reference unit, the sampling conditioning unit controls the PWM control unit respectively after being divided into two paths, and then the charging current and the charging voltage are adjusted through the double-tube driving unit respectively, so that the voltage of the auxiliary power supply array and the height of the current are consistent.
Specifically, a variable voltage intermittent charging method is proposed on the basis of a variable current intermittent charging method. The difference with the variable current intermittent charging method is that the first stage is not intermittent constant current but intermittent constant voltage. In each constant voltage charging stage, because constant voltage charging is adopted, the charging current naturally decreases according to an exponential law, and the characteristic that the acceptable rate of the battery current gradually decreases along with the charging is met.
Example 4
On the basis of the previous embodiment, the two-way discharge management monitoring unit comprises a current mirror image sampling circuit unit, a current-sharing MOS (metal oxide semiconductor) tube, a current-sharing MOS tube, a current-sharing voltage reference unit, a discharge current-sharing unit and a DC-DC power supply unit; the current mirror image sampling circuit unit respectively samples and monitors the discharge current of the secondary power supply array, the discharge current is compared with the current-sharing voltage reference unit, the voltage drop on the DSON resistance value when the current-sharing MOS tubes are switched on in the discharge process is monitored, and when the discharge currents of two groups of batteries are inconsistent, the discharge current of the batteries is linearly adjusted by controlling the switching-on degree of the external current-sharing MOS tubes through the output signals of the current-sharing unit, so that current-sharing discharge of the two secondary power supply arrays is achieved.
Specifically, the capacity of the battery pack is increased by commonly supplying power by the two sets of standby power supplies, and meanwhile, when the electric quantity of one set of batteries is exhausted, a new battery can be replaced under the condition of uninterrupted power supply. Thus, the charging current, charging voltage, discharging current and discharging voltage of each battery pack need to be monitored. If the current and the voltage of the battery pack have errors, the battery pack can be unbalanced in charging and uneven in discharging, so that the battery pack is damaged or potential safety hazards are caused. Most of the existing monitoring technologies detect the charge and discharge voltage and current of the battery through a current sharing resistor. Firstly, an average current, that is, a current value obtained by dividing the total load current by the total number of the batteries is obtained, the discharge current of each battery is compared with the average current, and if the discharge current of the group of batteries is larger than the average current, the discharge voltage is adjusted to be lower, and otherwise, the discharge voltage is adjusted to be higher.
Example 5
On the basis of the above embodiment, the two-way charging management monitoring unit monitors the charging voltage and the charging current of the battery and simultaneously monitors the discharging voltage and the discharging current of the battery by combining the two-way discharging management monitoring unit, so that the charging and the discharging of the battery are combined.
Example 6
An electric eye control method based on temperature compensation, the method performing the steps of:
step 1: the main power supply array monitoring protection circuit unit monitors a main power supply array, and the auxiliary power supply array monitoring protection circuit unit monitors an auxiliary power supply array;
step 2: according to the monitoring result, the multi-path switching circuit unit performs circuit switching and controls charging and discharging of the system;
and step 3: the double-circuit charging management monitoring unit controls the circuit to charge; and the two-way discharge management monitoring unit controls the circuit to discharge.
Example 7
On the basis of the above embodiment, the method further comprises the step of performing temperature compensation of the system; temperature compensation is achieved by employing a temperature compensation system comprising: the pressure sensor comprises a pressure sensing unit, a pressure signal amplifier, a temperature signal amplifier, a multiplexing switch, an A/D conversion unit and a processor; the pressure sensing unit consists of a pressure sensor and a temperature compensation resistor, and the temperature compensation resistor is connected to the excitation end of the pressure sensor; the temperature signal amplifier is connected with the exciting end of the pressure sensing unit, the pressure signal amplifier is connected with the signal output end of the pressure sensing unit, the pressure signal amplifier and the temperature signal amplifier are connected with the A/D conversion unit through a multiplexing switch, and the A/D conversion unit is connected with the processor; the main power supply array or the auxiliary power supply array provides exciting current for the pressure sensor, the temperature compensation resistor performs temperature compensation on the pressure sensor, the pressure sensing unit detects pressure and temperature signals and converts the pressure and temperature signals into voltage signals, the pressure signal amplifier and the temperature signal amplifier amplify the pressure and temperature signals, the A/D conversion unit converts analog signals into digital signals and sends the digital signals to the processor, and the processor processes the signals.
Specifically, a large amount of sulfuric acid and other solutions for ionization are arranged in the storage battery, and when a power supply is plugged, current passes through a lead plate (some batteries are not lead) in the storage battery to ionize the solutions, so that electric energy is converted into chemical energy; if used, the solution is converted to electrical energy that is transported away through the electrodes. This is a description of the principle, and in fact, the real situation is quite complex and can refer to relevant professional books.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process and related description of the system described above may refer to the corresponding process in the foregoing method embodiments, and will not be described herein again.
It should be noted that, the system provided in the foregoing embodiment is only illustrated by dividing the functional units, and in practical applications, the functions may be distributed by different functional units according to needs, that is, the units or steps in the embodiments of the present invention are further decomposed or combined, for example, the units in the foregoing embodiment may be combined into one unit, or may be further decomposed into multiple sub-units, so as to complete all or part of the functions described above. The names of the units and steps involved in the embodiments of the present invention are only for distinguishing the units or steps, and are not to be construed as unduly limiting the present invention.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes and related descriptions of the storage device and the processing device described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Those of skill in the art would appreciate that the various illustrative elements, method steps, and steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the software elements, method steps, and corresponding programs may be located in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. To clearly illustrate this interchangeability of electronic hardware and software, various illustrative components and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as electronic hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing or implying a particular order or sequence.
The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A power control system based on temperature compensation, the system comprising: a primary power supply array and a secondary power supply array; the main power supply array and the auxiliary power supply array are composed of a plurality of power supplies which are connected in series with each other in a block chain network structure; the system further comprises: the device comprises a main power supply array monitoring and protecting circuit unit, an auxiliary power supply array monitoring and protecting circuit unit, a double-path charging management and monitoring unit, a double-path discharging management and monitoring unit and a multi-path switching circuit unit; the main power supply array monitoring and protecting unit is respectively connected with the main power supply array, the two-way charging management monitoring unit and the multi-way switching circuit unit; and the auxiliary power supply array monitoring and protecting circuit unit is respectively connected with the auxiliary power supply array, the two-way discharge management monitoring unit and the multi-way switching circuit unit.
2. The system of claim 1, wherein the main power array monitoring protection circuit unit comprises: the current-sharing circuit comprises a current sampling circuit, a voltage sampling circuit, a current-sharing circuit, a current limiting circuit and a voltage amplifier; the current sampling circuit is connected with the current equalizing circuit; the current equalizing circuit is connected with the current limiting circuit; the voltage sampling circuit is connected with the voltage amplifier.
3. The system of claim 2, wherein the dual-path charging management monitoring unit comprises a current-sharing voltage reference unit, a sampling conditioning unit, a PWM control unit, a dual-tube driving unit, a synchronous voltage reduction unit, a current sampling unit, and a voltage sampling unit; the main power supply array charges the auxiliary power supply array through the two synchronous voltage reduction units respectively, in the charging process, the charging current and the charging voltage of the auxiliary power supply array are sampled in real time through the current sampling unit and the voltage sampling unit respectively, meanwhile, the main power supply array drives the sampling conditioning unit to receive sampling data through the current-equalizing voltage reference unit, the sampling conditioning unit controls the PWM control unit respectively after being divided into two paths, and then the charging current and the charging voltage are adjusted through the double-tube driving unit respectively, so that the voltage of the auxiliary power supply array and the height of the current are consistent.
4. The system of claim 3, wherein the two-way discharge management monitoring unit comprises a current mirror sampling circuit unit, a current equalizing MOS transistor, a current equalizing voltage reference unit, a discharge equalizing unit and a DC-DC power supply unit; the current mirror image sampling circuit unit respectively samples and monitors the discharge current of the secondary power supply array, the discharge current is compared with the current-sharing voltage reference unit, the voltage drop on the DSON resistance value when the current-sharing MOS tubes are switched on in the discharge process is monitored, and when the discharge currents of two groups of batteries are inconsistent, the discharge current of the batteries is linearly adjusted by controlling the switching-on degree of the external current-sharing MOS tubes through the output signals of the current-sharing unit, so that current-sharing discharge of the two secondary power supply arrays is achieved.
5. The system of claim 4, wherein the dual-way charging management monitoring unit monitors the charging voltage and the charging current of the battery and simultaneously monitors the discharging voltage and the discharging current of the battery in combination with the dual-way discharging management monitoring unit, so that the charging and the discharging of the battery are combined.
6. An electric eye control method based on temperature compensation according to the system of one of claims 1 to 5, characterized in that the method performs the following steps:
step 1: the main power supply array monitoring protection circuit unit monitors a main power supply array, and the auxiliary power supply array monitoring protection circuit unit monitors an auxiliary power supply array;
step 2: according to the monitoring result, the multi-path switching circuit unit performs circuit switching and controls charging and discharging of the system;
and step 3: the double-circuit charging management monitoring unit controls the circuit to charge; and the two-way discharge management monitoring unit controls the circuit to discharge.
7. The method of claim 6, further comprising the step of performing temperature compensation of the system; temperature compensation is achieved by employing a temperature compensation system comprising: the pressure sensor comprises a pressure sensing unit, a pressure signal amplifier, a temperature signal amplifier, a multiplexing switch, an A/D conversion unit and a processor; the pressure sensing unit consists of a pressure sensor and a temperature compensation resistor, and the temperature compensation resistor is connected to the excitation end of the pressure sensor; the temperature signal amplifier is connected with the exciting end of the pressure sensing unit, the pressure signal amplifier is connected with the signal output end of the pressure sensing unit, the pressure signal amplifier and the temperature signal amplifier are connected with the A/D conversion unit through a multiplexing switch, and the A/D conversion unit is connected with the processor; the main power supply array or the auxiliary power supply array provides exciting current for the pressure sensor, the temperature compensation resistor performs temperature compensation on the pressure sensor, the pressure sensing unit detects pressure and temperature signals and converts the pressure and temperature signals into voltage signals, the pressure signal amplifier and the temperature signal amplifier amplify the pressure and temperature signals, the A/D conversion unit converts analog signals into digital signals and sends the digital signals to the processor, and the processor processes the signals.
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| JP2004120857A (en) * | 2002-09-25 | 2004-04-15 | Matsushita Electric Ind Co Ltd | Power supply |
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| CN109974867A (en) * | 2019-04-19 | 2019-07-05 | 济南大学 | A kind of wireless automatic temperature measuring apparatus for mass concrete and its application with temperature self-compensation function |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004120857A (en) * | 2002-09-25 | 2004-04-15 | Matsushita Electric Ind Co Ltd | Power supply |
| CN102519666A (en) * | 2011-12-29 | 2012-06-27 | 中国燃气涡轮研究院 | Digital temperature compensation system and method |
| CN204334023U (en) * | 2014-12-16 | 2015-05-13 | 庄合荣 | A kind of portable power source |
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