CN220342059U - Spare battery switching circuit of elevator monitoring terminal - Google Patents
Spare battery switching circuit of elevator monitoring terminal Download PDFInfo
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- CN220342059U CN220342059U CN202321368345.3U CN202321368345U CN220342059U CN 220342059 U CN220342059 U CN 220342059U CN 202321368345 U CN202321368345 U CN 202321368345U CN 220342059 U CN220342059 U CN 220342059U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 25
- 238000005070 sampling Methods 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 230000005669 field effect Effects 0.000 claims description 64
- 239000003990 capacitor Substances 0.000 claims description 31
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000007726 management method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013523 data management Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- 238000011105 stabilization Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model discloses a standby battery switching circuit of an elevator monitoring terminal, which comprises a microcontroller module, and a microcontroller power module, a battery sampling module, an external power input detection module and a power switching module which are connected with the microcontroller module; the power supply switching module is respectively connected with the standby battery and an external power supply; the battery sampling module is connected with the standby battery and is used for collecting the voltage value of the standby battery; the external power input detection module is connected with an external power supply and is used for detecting whether the external power supply is input or not; and the microcontroller module instructs the power supply switching module to switch the standby battery to supply power according to the voltage value and whether an external power supply is input or not.
Description
Technical Field
The utility model relates to the technical field of elevators, in particular to a standby battery switching circuit of an elevator monitoring terminal.
Background
Currently, with the development of informatization and digitization, more and more elevators are equipped with elevator monitoring terminals. The elevator monitoring terminal is used for sending the elevator state data to the elevator management platform, so that the elevator management platform can conveniently carry out statistics, data analysis, management and the like. The elevator monitoring terminal is provided with a standby battery and is used for transmitting data before the elevator equipment is powered off to the elevator management platform when the elevator equipment is powered off, so that a battery switching circuit technology is needed.
In the prior art, when the power supply of the power grid is supplied, the battery does not supply power to the elevator monitoring terminal. When no grid power is input, the power supply is switched to the battery to supply power to the elevator monitoring terminal (namely, the battery is in a loaded state) until the power is input again or the battery power is consumed.
However, the applicant researches find that in the practical application of switching the battery circuit of the elevator monitoring terminal, the problem of restarting the elevator monitoring terminal for a plurality of times can occur.
Disclosure of Invention
In order to overcome the technical defects, the utility model provides a standby battery switching circuit of an elevator monitoring terminal.
In order to solve the problems, the utility model is realized according to the following technical scheme:
the utility model provides a standby battery switching circuit of an elevator monitoring terminal, which comprises a microcontroller module, and a microcontroller power module, a battery sampling module, an external power input detection module and a power switching module which are connected with the microcontroller module;
the power supply switching module is respectively connected with the standby battery and an external power supply;
the battery sampling module is connected with the standby battery and is used for collecting the voltage value of the standby battery;
the external power input detection module is connected with the external power supply and is used for detecting whether external power input exists or not;
and the microcontroller module instructs the power switching module to switch the standby battery to supply power according to the voltage value and whether an external power supply is input or not.
Preferably, the microcontroller module comprises an MCU, wherein the MCU comprises a positive power supply end, a negative power supply end, a first input port, a second input port and an output port, and the MCU has an analog-digital converter function;
the positive end of the power supply is connected with the negative end of the power supply;
the first input port is connected with the battery sampling module;
the second input port is connected with the external power input detection module;
the output port is connected with the power supply switching module.
Preferably, the microcontroller power module comprises a chip, an input filter capacitor and an output filter capacitor;
one end of the input filter capacitor is connected with VOUT and the input end of the chip, and the other end of the input filter capacitor is connected with the output filter capacitor, the grounding end of the chip and digital ground;
one end of the output filter capacitor is connected with the output end of the chip, VDD and the positive end of the power supply, and the other end of the output filter capacitor is connected with the negative end of the power supply, the grounding end of the chip, the input filter capacitor and the digital ground;
the chip is used for stabilizing the voltage of the input filter capacitor.
Preferably, the battery sampling module includes a first resistor and a second resistor;
one end of the first resistor is connected with the battery and the power supply switching module, and the other end of the first resistor is connected with the second resistor and the first input port;
one end of the second resistor is connected with the first resistor and the first input port, and the other end of the second resistor is connected with digital ground.
Preferably, the external power input detection module includes an eighth resistor, a ninth resistor, a tenth resistor, and a fifth triode;
one end of the eighth resistor is connected with an external power supply, and the other end of the eighth resistor is connected with the ninth resistor and the first pin of the fifth triode;
one end of the ninth resistor is connected with the eighth resistor and the first pin of the fifth triode, and the other end of the ninth resistor is connected with the second pin of the fifth triode and the digital ground;
one end of the tenth resistor is connected with VDD, and the other end of the tenth resistor is connected with a third pin of the fifth triode;
and a third pin of the fifth triode is connected with the second input port.
Preferably, the power supply switching module comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a third triode, a fourth triode, a first field effect transistor and a second field effect transistor;
one end of the third resistor is connected with the output port, and the other end of the third resistor is connected with a third pin of the third triode, the sixth resistor and a first pin of the fourth triode;
one end of the fourth resistor is connected with the external power supply, and the other end of the fourth resistor is connected with the fifth resistor and the first pin of the third triode;
one end of the fifth resistor is connected with the fourth resistor and the first pin of the third triode, and the other end of the fifth resistor is connected with the second pin of the third triode and the digital ground;
one end of the sixth resistor is connected with the third resistor, the third pin of the third triode and the first pin of the fourth triode, and the other end of the sixth resistor is connected with the second pin of the fourth triode and the digital ground;
one end of the seventh resistor is connected with the third pin of the fourth triode, the first pin of the second field effect tube and the first pin of the first field effect tube, and the other end of the seventh resistor is connected with the third pin of the second field effect tube and the second pin of the first field effect tube;
a first pin of the third triode is connected with the fourth resistor and the fifth resistor, a second pin of the third triode is connected with the fifth resistor and the digital ground, and a third pin of the third triode is connected with the third resistor, the sixth resistor and the first pin of the fourth triode;
the first pin of the fourth triode is connected with the sixth resistor, the third pin of the third triode and the third resistor, the second pin of the fourth triode is connected with the sixth resistor and the digital ground, and the third pin of the fourth triode is connected with the first pin of the second field effect transistor, the seventh resistor and the first pin of the first field effect transistor;
the first pin of the first field effect transistor is connected with the seventh resistor, the first pin of the second field effect transistor and the third pin of the fourth triode, the second pin of the first field effect transistor is connected with the seventh resistor and the third pin of the second field effect transistor, and the third pin of the first field effect transistor is connected with the battery and the first resistor;
the first pin of the second field effect transistor is connected with the third pin of the fourth triode, the seventh resistor and the first pin of the first field effect transistor, the second pin of the second field effect transistor is connected with VOUT, and the third pin of the second field effect transistor is connected with the seventh resistor and the second pin of the first field effect transistor.
Compared with the prior art, the utility model has the beneficial effects that: the microcontroller module controls whether to switch the battery power supply by detecting the presence or absence of an external power source and monitoring the battery voltage value. When the external power supply is powered on, the battery is not put into use. When the external power supply is switched from the power-on state to the power-off state, if the battery voltage sampled by the microcontroller module is larger than the lower limit threshold voltage which can be put into use by the preset battery voltage of the microcontroller module, the external power supply is switched to be powered by the battery; if the battery voltage sampled by the microcontroller module is smaller than the lower limit threshold voltage which can be used for presetting the battery voltage by the microcontroller module, the battery is not used, the microcontroller module is powered down, and the whole power supply switching module does not work. Even if the battery voltage rebounds after the battery is unloaded and exceeds the preset battery voltage of the microcontroller module, the lower limit threshold voltage can be put into use, and at the moment, the power supply switching module does not work due to the fact that the microcontroller module is powered down, and the elevator monitoring terminal can not restart for a plurality of times.
Drawings
The utility model is described in further detail below with reference to the attached drawing figures, wherein:
fig. 1 is a schematic diagram of the circuit connection of a backup battery switching circuit of an elevator monitoring terminal of the present utility model;
in the figure: 1-a microcontroller power module; 2-a microcontroller module; 3-a battery sampling module; 4-an external power input detection module; and 5-a power supply switching module.
Detailed Description
The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
As shown in fig. 1, a preferred structure of a standby battery switching circuit of an elevator monitoring terminal according to the present utility model.
Referring to fig. 1, the present utility model provides a technical solution:
a standby battery switching circuit of an elevator monitoring terminal comprises a microcontroller module, and a microcontroller power module, a battery sampling module, an external power input detection module and a power switching module which are connected with the microcontroller module.
The power supply switching module is respectively connected with the standby battery and an external power supply.
The battery sampling module is connected with the standby battery and is used for collecting the voltage value of the standby battery.
The external power input detection module is connected with an external power supply and is used for detecting whether the external power supply is input or not.
And the microcontroller module instructs the power supply switching module to switch the standby battery to supply power according to the voltage value and whether an external power supply is input or not.
As shown in fig. 1, the elevator monitoring terminal standby battery switching circuit includes a microcontroller module 2, a microcontroller power module 1, a battery sampling module 3, an external power input detection module 4, and a power switching module 5 in total. The power switching module 5 is connected to the battery backup BAT and the external power supply VIN, respectively. The battery sampling module 3 is connected to a battery backup BAT. The external power input detection module 4 is connected to an external power source VIN.
Preferably, the microcontroller module comprises an MCU, wherein the MCU comprises a positive power supply end, a negative power supply end, a first input port, a second input port and an output port, and the MCU has an analog-digital converter function.
The power supply positive end and the power supply negative end are connected with the microcontroller power supply module.
The first input port is connected with the battery sampling module.
The second input port is connected with an external power supply input detection module.
The output port is connected with the power supply switching module.
Specifically, as shown in fig. 1, the microcontroller module 2 includes an MCU-U1, where the MCU-U1 includes a positive power supply terminal VDD, a negative power supply terminal VSS, a first input port PA1, a second input port PA3, and an output port PA2, and the MCU-U1 has an analog-to-digital converter function. The first input port PA1 is used for collecting battery voltage, the second input port PA3 is used for detecting whether an external power supply is input, and the output port PA2 is used for controlling battery enabling and controlling whether the battery is put into use.
Preferably, the microcontroller power module includes a chip, an input filter capacitor, and an output filter capacitor.
One end of the input filter capacitor is connected with VOUT and the input end of the chip, and the other end of the input filter capacitor is connected with the output filter capacitor, the grounding end of the chip and digital ground.
One end of the output filter capacitor is connected with the output end of the chip, the VDD and the positive end of the power supply, and the other end of the output filter capacitor is connected with the negative end of the power supply, the grounding end of the chip, the input filter capacitor and the digital ground.
The chip is used for stabilizing the voltage of the input filter capacitor.
As shown in fig. 1, the specific circuit connection of the microcontroller power module is composed of an input filter capacitor C1, an output filter capacitor C2 and a chip U2. VOUT enters a chip U2 for voltage stabilization through an input filter capacitor C1, and then enters a VDD power supply positive terminal pin of the MCU-U1 through an output filter capacitor for power supply.
Preferably, the battery sampling module includes a first resistor and a second resistor.
One end of the first resistor is connected with the battery and the power supply switching module, and the other end of the first resistor is connected with the second resistor and the first input port.
One end of the second resistor is connected with the first resistor and the first input port, and the other end of the second resistor is connected with digital ground.
As shown in fig. 1, the battery sampling module specific circuit connection is composed of a first resistor R1 and a second resistor R2. The battery BAT is connected with one end of a first resistor R1, and enters a first input port PA1 of the MCU-U1 for AD sampling after being divided by R1 and R2, so as to obtain the actual voltage value of the battery.
Preferably, the external power input detection module includes an eighth resistor, a ninth resistor, a tenth resistor, and a fifth transistor;
one end of the eighth resistor is connected with an external power supply, and the other end of the eighth resistor is connected with the ninth resistor and the first pin of the fifth triode.
One end of the ninth resistor is connected with the eighth resistor and the first pin of the fifth triode, and the other end of the ninth resistor is connected with the second pin of the fifth triode and digital ground.
One end of the tenth resistor is connected with VDD, and the other end of the tenth resistor is connected with a third pin of the fifth triode.
The third pin of the fifth triode is connected with the second input port.
As shown in fig. 1, the external power input detection module is specifically connected by an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a fifth transistor Q5. The external power supply VIN is connected with one end of the eighth resistor R8, signals are divided by the eighth resistor R8 and the ninth resistor R9 and then enter a first pin Q5-1 of the fifth triode, the fifth triode Q5 is controlled to be conducted or cut off, and signals of the Q5-3 pin are input to a second input port PA3 of the MCU-U1 to carry out logic judgment. When an external power supply is input, the Q5-1 pin is in high level, the Q5 is conducted, the PA3 of the MCU-U1 receives a low level signal, and the external power supply is judged. When no external power supply is input, the Q5-1 pin is in a low level, the Q5 is cut off, the PA3 of the MCU-U1 receives a high level signal, and the external power supply is judged to be absent.
Preferably, the power supply switching module includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a third triode, a fourth triode, a first field effect transistor, and a second field effect transistor.
One end of the third resistor is connected with the output port, and the other end of the third resistor is connected with the third pin of the third triode, the sixth resistor and the first pin of the fourth triode.
One end of the fourth resistor is connected with an external power supply, and the other end of the fourth resistor is connected with the fifth resistor and the first pin of the third triode.
One end of the fifth resistor is connected with the fourth resistor and the first pin of the third triode, and the other end of the fifth resistor is connected with the second pin of the third triode and digital ground.
One end of the sixth resistor is connected with the third resistor, the third pin of the third triode and the first pin of the fourth triode, and the other end of the sixth resistor is connected with the second pin of the fourth triode and digital ground.
One end of the seventh resistor is connected with the third pin of the fourth triode, the first pin of the second field effect tube and the first pin of the first field effect tube, and the other end of the seventh resistor is connected with the third pin of the second field effect tube and the second pin of the first field effect tube.
The first pin of the third triode is connected with the fourth resistor and the fifth resistor, the second pin of the third triode is connected with the fifth resistor and the digital ground, and the third pin of the third triode is connected with the third resistor, the sixth resistor and the first pin of the fourth triode;
the first pin of the fourth triode is connected with the sixth resistor, the third pin of the third triode and the third resistor, the second pin of the fourth triode is connected with the sixth resistor and the digital ground, and the third pin of the fourth triode is connected with the first pin of the second field effect tube, the seventh resistor and the first pin of the first field effect tube.
The first pin of the first field effect transistor is connected with the seventh resistor, the first pin of the second field effect transistor and the third pin of the fourth triode, the second pin of the first field effect transistor is connected with the seventh resistor and the third pin of the second field effect transistor, and the third pin of the first field effect transistor is connected with the battery and the first resistor.
The first pin of the second field effect transistor is connected with the third pin of the fourth triode, the seventh resistor and the first pin of the first field effect transistor, the second pin of the second field effect transistor is connected with VOUT, and the third pin of the second field effect transistor is connected with the seventh resistor and the second pin of the first field effect transistor.
Specifically, as shown in fig. 1, the specific circuit connection of the power supply switching module is Q2 formed by a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third triode Q3, a fourth triode Q4, a first field effect transistor Q1 and a second field effect transistor. The battery BAT is connected with one end of a first field effect tube Q1, the other end of the first field effect tube Q1 is connected with one end of a second field effect tube Q2, and the other end of the second field effect tube Q2 is connected with VOUT.
The external power source VIN is connected with one end of the fourth resistor R4, and enters the first pin, namely the Q3-1 pin, of the third triode after being divided by the fourth resistor R4 and the fifth resistor R5 to control the on or off of the Q3. The sixth resistor R6 is connected with the first pin of the fourth triode, namely the Q4-1 pin, and the other end of the sixth resistor R6 is connected with the digital ground DGND, so that the Q4-1 pin is pulled down to the ground through the R6, and the Q4 is prevented from being turned on by mistake due to external interference. The seventh resistor R7 is connected with the first pin of the first field effect transistor, namely the Q1-1 pin, the first pin of the second field effect transistor, namely the Q2-1 pin, and the other end of the seventh resistor R7 is connected with the Q1-2 pin and the Q2-3 pin, so that the Q1 and the Q2 are prevented from being conducted by mistake due to static electricity.
The output port PA2 of the MCU-U1 outputs a high level or a low level, and the output port PA2 and the third triode Q3 together control the first pin of the fourth triode, i.e. Q4-1, to be a high level or a low level, and control the fourth triode Q4 to be turned on or off, and further, the fourth triode Q4 controls the first field effect tube Q1 and the second field effect tube Q2 to be turned on or off, i.e. whether the battery BAT supplies power.
When the external power supply is electrified, Q5 is conducted, the PA3 receives a low-level signal, the MCU-U1 judges that the external power supply is input to control the PA2 to output a high level, meanwhile, Q3 is conducted, Q4 is cut off, Q1 and Q2 are cut off, and the battery BAT is not put into use.
When the external power supply is switched from the power-on state to the power-off state, Q5 is cut off, the PA3 receives a high-level signal, the MCU-U1 judges that no external power supply is input, and meanwhile Q3 is cut off. If the BAT voltage sampled by the PA1 is larger than the lower limit threshold voltage which can be used when the battery voltage preset by the MCU-U1 is larger than the lower limit threshold voltage, the PA2 is controlled to continuously output high level, the Q4 is conducted, the Q1 and the Q2 are conducted, and the battery BAT is switched to supply power. If the BAT voltage sampled by the PA1 is smaller than the lower limit threshold voltage which can be used by the MCU-U1 to preset the battery voltage, the PA2 is controlled to output a low level, Q4 is cut off, Q1 and Q2 are cut off, the battery is not used, the MCU-U1 is powered down, and the whole power supply switching circuit does not work.
The present utility model is not limited to the preferred embodiments, and any modifications, equivalent variations and modifications made to the above embodiments according to the technical principles of the present utility model are within the scope of the technical proposal of the present utility model.
Claims (6)
1. The standby battery switching circuit of the elevator monitoring terminal is characterized by comprising a microcontroller module, and a microcontroller power module, a battery sampling module, an external power input detection module and a power switching module which are connected with the microcontroller module;
the power supply switching module is respectively connected with the standby battery and an external power supply;
the battery sampling module is connected with the standby battery and is used for collecting the voltage value of the standby battery;
the external power input detection module is connected with the external power supply and is used for detecting whether external power input exists or not;
and the microcontroller module instructs the power switching module to switch the standby battery to supply power according to the voltage value and whether an external power supply is input or not.
2. The elevator monitoring terminal backup battery switching circuit according to claim 1, wherein:
the microcontroller module comprises an MCU, wherein the MCU comprises a power supply positive end, a power supply negative end, a first input port, a second input port and an output port, and the MCU has an analog-digital converter function;
the positive end of the power supply is connected with the negative end of the power supply;
the first input port is connected with the battery sampling module;
the second input port is connected with the external power input detection module;
the output port is connected with the power supply switching module.
3. The elevator monitoring terminal backup battery switching circuit according to claim 2, wherein:
the microcontroller power module comprises a chip, an input filter capacitor and an output filter capacitor;
one end of the input filter capacitor is connected with VOUT and the input end of the chip, and the other end of the input filter capacitor is connected with the output filter capacitor, the grounding end of the chip and digital ground;
one end of the output filter capacitor is connected with the output end of the chip, VDD and the positive end of the power supply, and the other end of the output filter capacitor is connected with the negative end of the power supply, the grounding end of the chip, the input filter capacitor and the digital ground;
the chip is used for stabilizing the voltage of the input filter capacitor.
4. The elevator monitoring terminal backup battery switching circuit according to claim 3, wherein:
the battery sampling module comprises a first resistor and a second resistor;
one end of the first resistor is connected with the standby battery and the power supply switching module, and the other end of the first resistor is connected with the second resistor and the first input port;
one end of the second resistor is connected with the first resistor and the first input port, and the other end of the second resistor is connected with digital ground.
5. The elevator monitoring terminal backup battery switching circuit of claim 4, wherein:
the external power input detection module comprises an eighth resistor, a ninth resistor, a tenth resistor and a fifth triode;
one end of the eighth resistor is connected with an external power supply, and the other end of the eighth resistor is connected with the ninth resistor and the first pin of the fifth triode;
one end of the ninth resistor is connected with the eighth resistor and the first pin of the fifth triode, and the other end of the ninth resistor is connected with the second pin of the fifth triode and the digital ground;
one end of the tenth resistor is connected with VDD, and the other end of the tenth resistor is connected with a third pin of the fifth triode;
and a third pin of the fifth triode is connected with the second input port.
6. The elevator monitoring terminal backup battery switching circuit of claim 5, wherein:
the power supply switching module comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a third triode, a fourth triode, a first field effect transistor and a second field effect transistor;
one end of the third resistor is connected with the output port, and the other end of the third resistor is connected with a third pin of the third triode, the sixth resistor and a first pin of the fourth triode;
one end of the fourth resistor is connected with the external power supply, and the other end of the fourth resistor is connected with the fifth resistor and the first pin of the third triode;
one end of the fifth resistor is connected with the fourth resistor and the first pin of the third triode, and the other end of the fifth resistor is connected with the second pin of the third triode and the digital ground;
one end of the sixth resistor is connected with the third resistor, the third pin of the third triode and the first pin of the fourth triode, and the other end of the sixth resistor is connected with the second pin of the fourth triode and the digital ground;
one end of the seventh resistor is connected with the third pin of the fourth triode, the first pin of the second field effect tube and the first pin of the first field effect tube, and the other end of the seventh resistor is connected with the third pin of the second field effect tube and the second pin of the first field effect tube;
a first pin of the third triode is connected with the fourth resistor and the fifth resistor, a second pin of the third triode is connected with the fifth resistor and the digital ground, and a third pin of the third triode is connected with the third resistor, the sixth resistor and the first pin of the fourth triode;
the first pin of the fourth triode is connected with the sixth resistor, the third pin of the third triode and the third resistor, the second pin of the fourth triode is connected with the sixth resistor and the digital ground, and the third pin of the fourth triode is connected with the first pin of the second field effect transistor, the seventh resistor and the first pin of the first field effect transistor;
the first pin of the first field effect transistor is connected with the seventh resistor, the first pin of the second field effect transistor and the third pin of the fourth triode, the second pin of the first field effect transistor is connected with the seventh resistor and the third pin of the second field effect transistor, and the third pin of the first field effect transistor is connected with the standby battery and the first resistor;
the first pin of the second field effect transistor is connected with the third pin of the fourth triode, the seventh resistor and the first pin of the first field effect transistor, the second pin of the second field effect transistor is connected with VOUT, and the third pin of the second field effect transistor is connected with the seventh resistor and the second pin of the first field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321368345.3U CN220342059U (en) | 2023-05-31 | 2023-05-31 | Spare battery switching circuit of elevator monitoring terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321368345.3U CN220342059U (en) | 2023-05-31 | 2023-05-31 | Spare battery switching circuit of elevator monitoring terminal |
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| Publication Number | Publication Date |
|---|---|
| CN220342059U true CN220342059U (en) | 2024-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321368345.3U Active CN220342059U (en) | 2023-05-31 | 2023-05-31 | Spare battery switching circuit of elevator monitoring terminal |
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| CN (1) | CN220342059U (en) |
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- 2023-05-31 CN CN202321368345.3U patent/CN220342059U/en active Active
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