CN212721582U - Gas meter power supply circuit and encryption and decryption NB-IoT gas meter controller - Google Patents
Gas meter power supply circuit and encryption and decryption NB-IoT gas meter controller Download PDFInfo
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- CN212721582U CN212721582U CN202022083440.1U CN202022083440U CN212721582U CN 212721582 U CN212721582 U CN 212721582U CN 202022083440 U CN202022083440 U CN 202022083440U CN 212721582 U CN212721582 U CN 212721582U
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- 238000004891 communication Methods 0.000 claims abstract description 30
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 8
- 238000013500 data storage Methods 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 66
- 238000004146 energy storage Methods 0.000 claims description 38
- 230000000087 stabilizing effect Effects 0.000 claims description 25
- 230000006641 stabilisation Effects 0.000 claims description 7
- 238000011105 stabilization Methods 0.000 claims description 7
- 230000006855 networking Effects 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000007726 management method Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 3
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- 230000002093 peripheral effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000005059 dormancy Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
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Abstract
The utility model discloses a gas table power supply circuit and encryption and decryption NB-IoT gas table controller, including NB-IoT communication module, hardware AES encryption and decryption circuit, keying circuit, data storage circuit, liquid crystal display module, power management module with the control unit, wherein the control unit is connected in NB-IoT communication module, keying circuit, data storage circuit, liquid crystal display module, hardware AES encryption and decryption circuit, power control circuit respectively, NB-IoT communication module, keying circuit are connected with power management module respectively. The utility model discloses have the low-power consumption design, use the dry battery power supply, realized on the basis of traditional thing networking controller that AES hardware encryption and decryption processing has been carried out to all communication processing parts based on NB-IoT communication technology, the protection of very big degree user data's safety and the safety of transmission.
Description
Technical Field
The utility model relates to a gas table power supply circuit and gas meter controller, concretely relates to gas table power supply circuit and encryption and decryption NB-IoT gas meter controller.
Background
Along with the promotion of the urbanization process and the large-scale laying and application of urban gas pipelines, metering data of actual user families cannot be monitored aiming at domestic gas resident user families, and a gas company is prompted to have the demand of dynamic remote heat supply effect monitoring through an Internet of things gas meter. The traditional gas meter adopting a wireless ad hoc network transmission mode has the defects of short communication distance, troublesome networking, networking by adding a concentrator and the like. The GSM/CDMA/GPRS technology is developed for personal communication in the last 90 th century, and is applied to the field of gas meters of the Internet of things to a certain extent, but the gas meters of the GSM/CDMA/GPRS Internet of things in the current technical scheme have the defects of high cost, high expense, large on-line power consumption and the like.
NB-IoT (narrowband cellular internet of things) is focused on the low power wide coverage (LPWA) internet of things (IoT) market, an emerging technology that can be widely applied worldwide. Compared with the NB-IoT technology of wireless communication protocols such as WiFi, Bluetooth and GSM, the method has the characteristics of wide coverage, more connections, low speed, low cost, low power consumption, excellent architecture and the like, so that the method is suitable for large-scale application in the fields of sensing, metering, monitoring and the like.
When a battery of an existing gas meter power supply circuit is under-voltage, the normal work of a gas meter controller cannot be guaranteed, and data loss can be caused; in addition, the existing gas meter controller has the problems of high power consumption, poor stability of the gas meter controller during working, complex networking and the like.
Disclosure of Invention
An object of the utility model is to provide a gas table power supply circuit and encryption and decryption NB-IoT gas meter controller for solve the not high problem of job stabilization nature of the gas table power supply circuit and the gas meter controller existence among the prior art.
In order to realize the task, the utility model discloses a following technical scheme:
a power supply circuit of a gas meter comprises a power supply unit, a voltage stabilizing module, a boosting energy storage module and a switching module; the power supply unit is used for providing input voltage; the switching module is used for inputting the input voltage to the boosting energy storage module or the voltage stabilizing module; the boosting energy storage module is used for boosting the input voltage and then storing the boosted input voltage to obtain energy storage voltage; the voltage stabilizing module is used for stabilizing the input voltage or the energy storage voltage and outputting the power supply voltage.
Preferably, the boost energy storage module comprises a boost circuit and an energy storage circuit; the booster circuit is used for boosting the input voltage to obtain a boosted voltage; the energy storage circuit is used for storing the boosted voltage to obtain an energy storage voltage; the boosting circuit comprises a boosting chip U1, an inductor L1 connected with the boosting chip U1, a capacitor C4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7; the energy storage circuit comprises a capacitor C3 and a capacitor bank which are connected in parallel, wherein the capacitor bank comprises a capacitor E1 and a capacitor E2 which are connected in series.
Preferably, the switching module includes a diode D1 and a diode D2 connected in parallel with each other; the diode D1 is connected with the boosting energy storage module; the diode D2 is connected to the power supply unit.
Preferably, the voltage regulation module includes a voltage regulation chip U2, and a capacitor C1 and a capacitor C2 connected to the voltage regulation chip U2.
An encryption and decryption NB-IoT gas meter controller comprises a control module, a communication module, a data storage module, a gas meter power circuit and a hardware encryption and decryption module, wherein the power circuit is connected with the data storage module; the gas meter power supply circuit is used for supplying power to the control module and the communication module; the control module is used for controlling the hardware encryption and decryption module to carry out AES encryption and decryption on the data to obtain the transmittable data and the processable data.
Preferably, the gas meter controller further comprises a liquid crystal display module and a key module.
Preferably, the hardware encryption and decryption module comprises a hardware encryption and decryption chip U3, and a capacitor C5, a resistor R8 and a resistor R9 which are connected with the hardware encryption and decryption chip U3.
Preferably, the control module is a single chip microcomputer.
Preferably, the communication module is an NB-IoT wireless communication module.
Compared with the prior art, the utility model following technological effect has:
1. the utility model provides a gas meter power supply circuit adopts energy storage capacitor cooperation step up DC-DC circuit to realize the automatic compensation function when the battery is under-voltage, utilizes the battery capacity of four 1.5V dry batteries to the utmost extent, and has guaranteed the normal stable operation of entire system when battery voltage is less than 3.3V;
2. the utility model provides an encryption/decryption NB-IoT gas meter controller adopts NB-IoT public network to realize the functions that gas companies urgently need such as data upload, upload cycle modification, real-time monitoring, provides favorable support for gas company's cloud service and gas big data analysis, has made things convenient for gas company's operation management to a great extent;
3. the utility model provides an encryption/decryption NB-IoT gas meter controller adopts the micro-power design, and the micro-processor adopts an imported low-power high-performance single chip microcomputer, and the dormancy power consumption is as low as 2 uA; dormancy power consumption of NB-IoT radios is as low as 8 uA; the method has the characteristics of low power consumption, low cost and stable transmission.
Drawings
Fig. 1 is a schematic diagram of a gas meter power supply circuit structure provided by the present invention;
fig. 2 is a schematic diagram of the internal structure of the encryption and decryption NB-IoT gas meter controller provided by the present invention;
fig. 3 is an internal circuit diagram of the hardware encryption and decryption module provided by the present invention.
Fig. 4 is the utility model provides a gas table goes upward data flow chart.
Fig. 5 is the utility model provides a downlink data flow chart of gas table.
The reference numerals in the figures denote: a power supply unit A; a voltage stabilizing module B; a boost energy storage module C; and switching the module D.
Detailed Description
Example one
As shown in fig. 1, in this embodiment, a power supply circuit for a gas meter is disclosed, which includes a power supply unit a and a voltage stabilization module B, and the power supply circuit further includes a boost energy storage module C and a switching module D;
the power supply unit A is used for providing input voltage;
the switching module D is used for inputting the input voltage to the boosting energy storage module C or the voltage stabilizing module B;
the boosting energy storage module C is used for boosting the input voltage and then storing the boosted input voltage to obtain energy storage voltage;
the voltage stabilizing module B is used for stabilizing the input voltage or the energy storage voltage and outputting the power supply voltage.
In the embodiment, a circuit switching mode is adopted, so that the automatic switching function that the system is powered by a booster circuit or a battery is realized. The power supply unit A supplies power for two No. 7 batteries J1, and the normal use voltage range is as follows: 2-3V, the reliable working voltage of chips such as a microcontroller and a liquid crystal display module which actually work is required to be above 3.3V, and when the J1 power supply voltage is lower than the voltage 3.3V required by the circuit, the circuit cannot work normally. To solve this problem, the boost circuit must be enabled. When the battery voltage is detected to be lower than a preset value, such as 3.5V, the booster circuit is started; after the booster circuit is started, because the two high-capacity capacitors are arranged behind the booster circuit to store electric energy, the high-capacity capacitors can still enable the system to work for a period of time after the booster circuit is closed. Because the voltage of the high-capacity capacitor is monitored in real time all the time, when the voltage drops to a preset value such as 3.3V when the system is powered, the control unit automatically starts the booster circuit, and when the voltage of the high-capacity capacitor is detected to be full, the booster circuit is closed. According to the closed-loop control logic circuit and the software, the automatic opening and closing functions of the booster circuit are realized. Therefore, the effective utilization of the battery capacity is greatly improved, the whole power consumption of the system is reduced due to the dynamic charging function, and the performance of the whole product is more stable and reliable.
Specifically, the boost energy storage module C comprises a boost circuit and an energy storage circuit;
the boost circuit is used for boosting the input voltage to obtain a boosted voltage;
the energy storage circuit is used for storing the boosted voltage to obtain an energy storage voltage;
the boosting circuit comprises a boosting chip U1, an inductor L1 connected with the boosting chip U1, a capacitor C4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7;
the energy storage circuit comprises a capacitor C3 and a capacitor bank which are connected in parallel, wherein the capacitor bank comprises a capacitor E1 and a capacitor E2 which are connected in series.
Specifically, the switching module includes a diode D1 and a diode D2 connected in parallel;
the diode D1 is connected with the boosting energy storage module; the diode D2 is connected to the power supply unit a.
Specifically, the voltage regulation module includes a voltage regulation chip U2, and a capacitor C1 and a capacitor C2 connected to the voltage regulation chip U2.
In this embodiment, the step-up energy storage module C and the switching module D in the power supply circuit of the gas meter, as shown in fig. 1 specifically, include: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor E1, a capacitor E2, an inductor L1, a boost chip U1, a diode D1, a diode D2 and a voltage stabilizing chip U2.
The resistor R7 is connected with the power supply unit A and then connected with the resistor R6 in series at an AD _ BAT point, the resistor R6 is grounded, and the AD _ BAT is connected with the control unit to monitor the real-time voltage of the battery in real time. The inductor L1 is connected with A, the 1 end of the boost chip U1 is connected with the inductor, the 6 end of the boost chip, the resistor R5, the capacitor C4 and the inductor L1 meet with a BAT point, the capacitor C1 is used for power input pre-filtering, the 4 end of the boost chip U1 and the resistor R2 intersect at a V _ EN point, and the V _ EN is connected with the control unit and used for controlling whether the boost chip needs to work or not. The pull-up resistor R6 ensures that the boost chip can work reliably, the 2 end of the boost chip U1 is grounded, the 3 end of the boost chip is converged with the resistor R3 and the resistor R4 and connected with the point A, the resistor R4 is grounded, the 5 end of the boost chip U1 is converged with the resistor R3, the resistor R1 capacitor C3, the capacitor E2 and the diode D1 and connected with the point NB _ POWER, the resistor R1 and the resistor R2 are connected in series at the point V _ NB, and the point V _ NB is connected with the control unit and used for detecting the voltage stored with energy through the two high-capacity capacitors E1 and E2 after boosting. The capacitor E1 is connected with the capacitor E2 in series, and the resistor R2, the resistor R4, the capacitor C3 and the capacitor E1 are all grounded. The interface A is communicated with the diode D2 and then converged with the diode D1 at the point B, and the 2 end of the voltage stabilizing chip U2 is connected with the point B.
The resistor R6 and the resistor R7 form a series voltage dividing circuit, AD _ BAT at the joint of the resistor R6 and the resistor R7 is connected with the control unit, the voltage of the AD _ BAT is detected, and the power supply voltage is calculated.
The inductor L1 is a boosting inductor, and forms a boosting circuit together with the boosting chip U1 and other peripheral devices; the U1 bit switch type boost chip of the boost chip and other peripheral devices form a switch type boost circuit.
The resistor R5 and the capacitor C4 form an RC filter circuit for stabilizing a control signal of the enable terminal EN of the boost chip.
The resistor R3 and the resistor R4 form a series voltage division circuit, and a reference voltage is provided for FB at the connection position of R3 and R4; the resistor R1 and the resistor R2 form a series voltage division circuit, the V _ NB at the connection part of the R1 and the R2 is connected with the control unit, the voltage of the V _ NB is detected, and the voltage boosted by the booster circuit is calculated.
The capacitor C3 is a filter capacitor for filtering the output voltage. The capacitor E1 and the capacitor E2 are both super capacitors and are connected in series to form an energy storage capacitor group for storing energy of the circuit.
The diode D1 and the diode D2 in the switching module D supply power directly from the power supply unit a to the regulator chip U2 when the boost circuit is not enabled. When the booster circuit is enabled, the voltage stabilization chip U2 is powered through the NB _ POWER point.
The diode D1 and the diode D2 form a power supply switching and anti-backflow circuit, and are used for switching the D1 or the D2 to supply power to the voltage stabilizing chip U2 and preventing current backflow.
The 1 end of the voltage stabilizing chip U2 is grounded, the 3 end of the voltage stabilizing chip U2 is converged with the capacitor C1 and the capacitor C2 at a VCC point, and the capacitor C1 and the capacitor C2 are grounded respectively. The 3 ends of the voltage stabilizing chip U2 are filtered by a capacitor C1 and a capacitor C2 to supply power to the system and the control unit. The two diodes D1 and D2 are used for isolated and separate power supply, so that the automatic switching function that the power supply of the system is supplied by a booster circuit or a battery is realized.
The voltage stabilizing chip U2 is an LDO type voltage stabilizing circuit, and is used for stabilizing an input 9V-3.5V voltage into a 3.3V voltage for output.
The capacitor C1 and the capacitor C2 form a two-stage filter circuit, and two-stage filtering is performed on the output of the voltage stabilizing chip U2 to obtain a purer power supply.
The working principle of the gas meter power supply circuit is as follows:
the power supply unit inputs power into the circuit through J1, the MCU detects battery voltage through AD _ BAT, if the voltage is higher than a preset value, for example, 3.5 volts, the MCU outputs low level for V _ EN, the boosting module U1 does not work, current is input into the voltage stabilizing module U2 through the diode D2, at the moment, the D1 prevents current backflow, and the U2 outputs stable power supply voltage after filtering through C1 and C2. If the MCU detects that the battery voltage is lower than a preset value, such as 3.3 volts, through the AD _ BAT, the MCU outputs a high level to the V _ EN, the boosting module U1 starts to work, the boosted voltage, such as 4.0V, is stored in the energy storage capacitor banks E1 and E2, and is input into the voltage stabilizing module U2 through the diode D1, at the moment, the D2 prevents current backflow, and the U2 outputs stable power supply voltage after being filtered by the C1 and the C2.
Example two
An encryption and decryption NB-IoT gas meter controller comprises a control module, a communication module and a data storage module, and further comprises a gas meter power supply circuit and a hardware encryption and decryption module in the first embodiment;
the gas meter power supply circuit is used for supplying power to the control module and the communication module;
the control module is used for controlling the hardware encryption and decryption module to carry out AES encryption and decryption on the data to obtain the transmittable data and the processable data.
In this embodiment, the operational principle of the encryption and decryption NB-IoT gas meter controller is specifically as follows:
because data and commands of the NB-IoT gas meter need to be transmitted through the public network, in order to ensure the security of the data, all data passing through the public network must be encrypted before being transmitted, and the specific data flow is as follows:
the NB-IoT gas meter uplink data flow is as shown in fig. 4, the gas meter working data is encrypted by the hardware encryption and decryption module to obtain transmittable data, the transmittable data is sent to the network through the communication module, the data is sent to the server encryption and decryption front-end processor through the network, the processable data is obtained after encryption and decryption front-end decryption, the processable data is sent to the server, and the processable data is processed by the server management software and is analyzed into effective data which can be viewed and operated by the user;
as shown in fig. 5, a command of the server is firstly encrypted by the encryption front-end processor to obtain transmittable data, and then the transmittable data is sent to the NB-IoT gas meter through the network, after the communication module of the NB-IoT gas meter controller receives the data, the communication module must decrypt the data through the hardware encryption/decryption module to obtain processable data, and the decrypted processable data can be processed by the NB-IoT gas meter.
Specifically, the gas meter controller further comprises a liquid crystal display module and a key module.
In this embodiment, the key circuit is configured to trigger a key signal, and when the microcontroller detects the key signal, the microcontroller controls the liquid crystal display module to display corresponding information according to the key signal. As an implementation mode, the key circuit comprises a key, a pull-up resistor and a filter circuit, and the key signal is at a high level normally. The microcontroller controls the liquid crystal display module to display corresponding characters according to the triggering times and duration of the key signals, can set the current time, and realizes the functions of startup and shutdown and the like.
Specifically, the hardware encryption and decryption module includes a hardware encryption and decryption chip U3, and a capacitor C5, a resistor R8, and a resistor R9 connected to the hardware encryption and decryption chip U3.
In this embodiment, the hardware encryption and decryption module, the microcontroller and the hardware encryption and decryption module are specifically connected as shown in fig. 3, and include a triode Q2, a resistor R8, a resistor R9, a resistor R12, a capacitor C5 and a hardware encryption and decryption chip U3, and the microcontroller controls E _ CTL, E _ SDA, E _ SCL, and E _ RST through the IO port to perform power control and communication control with the hardware encryption and decryption chip, thereby implementing the AES encryption and decryption functions of data.
The triode Q2 is a power supply control device of the encryption and decryption module, when the control unit outputs a high level through the E _ CTL, the Q2 is in a turn-off state, and the encryption and decryption module is not supplied with power; when E _ CTL outputs low level, Q2 is in conducting state, and power is supplied to the encryption and decryption module. The resistor R12 is a current limiting resistor at the control end of the triode and is used for limiting the current of the signal of Q2. The resistor R8 and the resistor R9 are pull-up resistors, and because the control port of the encryption and decryption chip U3 is an OC gate, the encryption and decryption chip U3 can normally work only by connecting the pull-up resistors. The capacitor C5 is a filter capacitor, and the power supplied by the Q2 is filtered by the C5 and then supplied to the encryption and decryption chip U3, so that the stable work of the U3 is ensured. The encryption/decryption chip U3 is a core chip for processing data encryption or decryption, and completes the functions of encryption and decryption of data in cooperation with peripheral circuits.
Specifically, the control module is a single chip microcomputer.
In this embodiment, the control module may adopt any microcontroller in the prior art, such as a single chip microcomputer, and in this example, a high-performance micro-power consumption single chip microcomputer R7FC019 is adopted.
Specifically, the communication module is an NB-IoT wireless communication module.
In this embodiment, the NB-IoT wireless communication module adopts a patch-type internet of things card, and is connected to the communication terminal of the microcontroller through a UART bus. As an embodiment, the NB-IoT wireless communication module comprises an integrated circuit SARA-N200, and a surface mount type packaged physical networking SIM card is directly welded on a circuit board. The NB-IoT wireless communication module selects the omnidirectional spring antenna as a signal transceiving antenna.
The utility model discloses an encryption and decryption NB-IoT thing networking controller job stabilization with hardware AES is reliable, adopts little consumption design, fuses NB-IoT wireless communication technique and measurement technique in an organic whole, has realized the thing networking solution of gas table equipment end, perfect solution traditional temperature gas table communication distance near, dispose inconvenient, the real-time poor, the big scheduling problem of consumption. The utility model has the functions of uploading data regularly, setting parameters remotely, monitoring remotely, etc.; the management of a heating power company is facilitated to a great extent, the working efficiency of the heating power company is improved, and the trouble and the personnel cost of requiring personnel to enter the house for temperature measurement are reduced; the utility model discloses support changeable data acquisition and upload function such as month, day, time of mainstream, support the user to learn the real-time data in oneself family through cell-phone APP or webpage in real time.
Claims (9)
1. A gas meter power supply circuit comprises a power supply unit (A) and a voltage stabilizing module (B), and is characterized by further comprising a boosting energy storage module (C) and a switching module (D);
the power supply unit (A) is used for providing input voltage;
the switching module (D) is used for inputting the input voltage to the boosting energy storage module (C) or the voltage stabilizing module (B);
the boosting energy storage module (C) is used for boosting the input voltage and then storing the boosted input voltage to obtain energy storage voltage;
and the voltage stabilizing module (B) is used for stabilizing the input voltage or the energy storage voltage and outputting a power supply voltage.
2. The gas meter power supply circuit according to claim 1, wherein the boost energy storage module (C) comprises a boost circuit and an energy storage circuit;
the booster circuit is used for boosting the input voltage to obtain a boosted voltage;
the energy storage circuit is used for storing the boosted voltage to obtain an energy storage voltage;
the boosting circuit comprises a boosting chip U1, an inductor L1 connected with the boosting chip U1, a capacitor C4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7;
the energy storage circuit comprises a capacitor C3 and a capacitor bank which are connected in parallel, wherein the capacitor bank comprises a capacitor E1 and a capacitor E2 which are connected in series.
3. The gas meter power supply circuit according to claim 1, characterized in that the switching module (D) comprises a diode D1 and a diode D2 connected in parallel;
the diode D1 is connected with the boosting energy storage module (C); the diode D2 is connected to the power supply unit (a).
4. The gas meter power supply circuit according to claim 1, wherein the voltage stabilization module (B) comprises a voltage stabilization chip U2, and a capacitor C1 and a capacitor C2 connected to the voltage stabilization chip U2.
5. An encryption and decryption NB-IoT gas meter controller, which comprises a control module, a communication module and a data storage module, and is characterized by further comprising a gas meter power supply circuit and a hardware encryption and decryption module as claimed in any one of claims 1 to 4;
the gas meter power supply circuit is used for supplying power to the control module and the communication module;
the control module is used for controlling the hardware encryption and decryption module to carry out AES encryption and decryption on the data to obtain the transmittable data and the processable data.
6. The encryption/decryption NB-IoT gas meter controller according to claim 5, wherein the gas meter controller further comprises a liquid crystal display module and a key module.
7. The encryption and decryption NB-IoT gas meter controller of claim 5, wherein the hardware encryption and decryption module comprises a hardware encryption and decryption chip U3, and a capacitor C5, a resistor R8 and a resistor R9 which are connected with the hardware encryption and decryption chip U3.
8. The encryption and decryption NB-IoT gas meter controller of claim 5, wherein the control module is a single chip microcomputer.
9. The encryption/decryption NB-IoT gas meter controller according to claim 5, wherein the communication module is an NB-IoT wireless communication module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022083440.1U CN212721582U (en) | 2020-09-21 | 2020-09-21 | Gas meter power supply circuit and encryption and decryption NB-IoT gas meter controller |
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| CN202022083440.1U CN212721582U (en) | 2020-09-21 | 2020-09-21 | Gas meter power supply circuit and encryption and decryption NB-IoT gas meter controller |
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| CN212721582U true CN212721582U (en) | 2021-03-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114268146A (en) * | 2021-12-07 | 2022-04-01 | 成都长城开发科技有限公司 | Power supply device and method for electronic instrument in low-temperature environment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114268146A (en) * | 2021-12-07 | 2022-04-01 | 成都长城开发科技有限公司 | Power supply device and method for electronic instrument in low-temperature environment |
| CN114268146B (en) * | 2021-12-07 | 2024-02-13 | 成都长城开发科技股份有限公司 | Power supply device and method for electronic instrument in low-temperature environment |
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