CN209000056U - A kind of burn-out-proof card circuit and electronic equipment - Google Patents
A kind of burn-out-proof card circuit and electronic equipment Download PDFInfo
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- CN209000056U CN209000056U CN201822211146.7U CN201822211146U CN209000056U CN 209000056 U CN209000056 U CN 209000056U CN 201822211146 U CN201822211146 U CN 201822211146U CN 209000056 U CN209000056 U CN 209000056U
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Abstract
The utility model provides a kind of burn-out-proof card circuit and electronic equipment, is related to the communications field.The burn-out-proof card circuit includes power supply unit, switch unit, detection unit and processor, processor is electrically connected with power supply unit and detection unit, one end of switch unit is electrically connected with detection unit, and the other end of switch unit is electrically connected between processor and power supply unit；Detection unit is for exporting first detection signal when detecting that composite card is extracted from card slot；Switch unit is used for when composite card is extracted from card slot, and according to the current control signal conducting that first detection signal and processor export, wherein current control signal is the control signal that processor is exported when composite card is inserted in card slot；Power supply unit provides operating voltage to composite card for stopping in switching means conductive.The burn-out-proof card circuit can prevent appearance short circuit during pulling out card from burning card phenomenon.
Description
Technical field
The utility model relates to fields of communication technology, in particular to a kind of burn-out-proof card circuit and electronic equipment.
Background technique
Since the pcb board of LET smart terminal product design becomes small, plate end is got over for engineer using the region of goods of furniture for display rather than for use
Come it is fewer, while radio frequency in terms of again need to meet the whole network road full frequency band demand so that SIM card and SD card, which are total to the three of card slot, selects two cards
Seat product comes into being, due to having short circuit event hair during this deck does not consider plug-in card when structure designs
It is raw, it may appear that card phenomenon is burnt in the short circuit of low probability.
Current solution is to be detected in deck to send out with the presence or absence of SIM card and SD card according to detection circuit by CPU
Detection signal out come control power unit whether to deck provide voltage.But CPU is obtained being handled detection signal
When to corresponding control signal, certain processing time is needed, therefore can be occurred within the processing time during pulling out card short
Burn card phenomenon in road.
Utility model content
The purpose of this utility model is to provide a kind of burn-out-proof card circuit and electronic equipments, can by the burn-out-proof card circuit
Prevent appearance short circuit during pulling out card from burning card phenomenon.
To achieve the goals above, the technical solution adopted in the utility model is as follows:
In a first aspect, the utility model embodiment provides a kind of burn-out-proof card circuit, including power supply unit, switch unit,
Detection unit and processor, processor are electrically connected with power supply unit and detection unit, one end of switch unit and detection unit
Electrical connection, the other end of switch unit are electrically connected between processor and power supply unit；Detection unit is used to detect combination
Card exports first detection signal when extracting from card slot；Switch unit is used for when composite card is extracted from card slot, according to first
The current control signal conducting of signal and processor output is detected, wherein current control signal is that processor is inserted in composite card
The control signal exported when in card slot；Power supply unit provides operating voltage to composite card for stopping in switching means conductive.
Further, switch unit includes diode, and the cathode of diode is electrically connected with detection unit, the anode of diode
It is electrically connected between processor and power supply unit；Diode is used for when composite card is extracted from card slot, according to the first detection letter
Number and processor output current control signal conducting.
Further, power supply unit includes linear voltage regulator, and linear voltage regulator includes enable end, and the anode of diode is electrically connected
It is connected between processor and enable end；Linear voltage regulator provides operating voltage to composite card for stopping in diode current flow.
Further, power supply unit further includes first resistor, and one end of first resistor is electrically connected with enable end, first resistor
The other end ground connection.
Further, power supply unit further includes second resistance, and one end of second resistance is electrically connected with processor, second resistance
The other end be electrically connected with enable end, the anode of diode is electrically connected between the other end of second resistance and enable end.
Further, linear voltage regulator further includes input terminal, and input terminal is electrically connected with a system power supply；Linear voltage regulator is used
In the system voltage for system power supply being provided when composite card is inserted in card slot be converted to operating voltage.
Further, power supply unit further includes first capacitor, and one end of first capacitor is electrically connected with input terminal, first capacitor
The other end ground connection.
Further, linear voltage regulator includes output end, and output end is electrically connected with card slot；Linear voltage regulator is for combining
Card is exported operating voltage to card slot by output end when being inserted in card slot.
Further, power supply unit further includes the second capacitor, and one end of the second capacitor is electrically connected with output end, the second capacitor
The other end ground connection.
Second aspect, the utility model embodiment provide a kind of electronic equipment, which includes burn-out-proof card circuit,
Burn-out-proof card circuit includes power supply unit, switch unit, detection unit and processor, and processor and power supply unit and detection unit are equal
Electrical connection, one end of switch unit are electrically connected with detection unit, and the other end of switch unit is electrically connected to processor and power supply list
Between member；Detection unit is for exporting first detection signal when detecting that composite card is extracted from card slot；Switch unit is used for
When composite card is extracted from card slot, according to the current control signal conducting that first detection signal and processor export, wherein when
Preceding control signal is the control signal that processor is exported when composite card is inserted in card slot；Power supply unit is used in switch unit
Stop providing operating voltage to composite card when conducting.
The beneficial effect of burn-out-proof card circuit and electronic equipment provided by the utility model is: detecting group by detection unit
It closes when card is extracted from card slot and obtains first detection signal；Switch unit is examined when composite card is extracted from card slot according to first
The current control signal conducting of signal and processor output is surveyed, and controls power supply unit and stops providing operating voltage to composite card,
Wherein current control signal is the control signal that processor is exported when composite card is inserted in card slot.As it can be seen that composite card from
When extracting in card slot, processor will not immediately carry out the change of control signal, when also will continue to for composite card being inserted in card slot
Obtained control signal is exported to power supply unit；It is extracted from card slot in composite card and the control signal of processor output does not carry out
When corresponding change, power supply unit is controlled by switch unit and stops providing operating voltage to composite card, can prevent from pulling out snapping past
Occurs the phenomenon that card is burnt in short circuit in journey.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the structural block diagram of burn-out-proof card circuit provided by the utility model；
Fig. 2 is the circuit diagram of switch unit provided by the utility model；
Fig. 3 is the circuit diagram of power supply unit provided by the utility model；
Fig. 4 is the circuit diagram of burn-out-proof card circuit provided by the utility model；
Fig. 5 is the structural block diagram of electronic equipment provided by the utility model.
Icon: 1- electronic equipment；10- burn-out-proof card circuit；11- power supply unit；12- switch unit；13- detection unit；14-
Processor；20- system power supply；30- card slot；40- composite card；D1- diode；U1- linear voltage regulator；R1- first resistor；R2-
Second resistance；C1- first capacitor；The second capacitor of C2-.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Usually here in attached drawing description and
The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.
Therefore, requirement is not intended to limit to the detailed description of the embodiments of the present invention provided in the accompanying drawings below
The scope of the utility model of protection, but it is merely representative of the selected embodiment of the utility model.Based in the utility model
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the range of the utility model protection.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should be understood that term " center ", "upper", "lower", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, or
The utility model product using when the orientation or positional relationship usually put or those skilled in the art usually understand
Orientation or positional relationship is merely for convenience of describing the present invention and simplifying the description, rather than indication or suggestion is signified sets
Standby or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to the utility model
Limitation.
In addition, term " first ", " second ", " third " etc. are only used for distinguishing description, it is not understood to indicate or imply
Relative importance.
In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, term " is set
Set ", " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection,
Or it is integrally connected；It can be mechanical connection, be also possible to connect；It can be directly connected, it can also be by between intermediary
It connects connected, can be the connection inside two elements.For the ordinary skill in the art, can be understood with concrete condition
The concrete meaning of above-mentioned term in the present invention.
Embodiment
Referring to Fig. 1, being the structural block diagram of burn-out-proof card circuit 10 provided by the utility model, which includes
Power supply unit 11, switch unit 12, detection unit 13 and processor 14, processor 14 and power supply unit 11 and detection unit 13 are equal
Electrical connection, one end of switch unit 12 are electrically connected with detection unit 13, and the other end of switch unit 12 is electrically connected to processor 14
Between power supply unit 11.
In the present embodiment, detection unit 13 is used for the first inspection of output when detecting that composite card 40 is extracted from card slot 30
Survey signal；Switch unit 12 is used for when composite card 40 is extracted from card slot 30, defeated according to first detection signal and processor 14
Current control signal conducting out, wherein current control signal is the output when composite card 40 is inserted in card slot 30 of processor 14
Control signal；Power supply unit 11 is used to stop when switch unit 12 is connected to provide operating voltage to composite card 40.
It is appreciated that being according to group in the current control signal that composite card 40 is extracted from card slot 30 and processor 14 exports
(i.e. the control signal of the output of processor 14 is also not according to composite card when the control signal that conjunction card 40 exports when being inserted in card slot 30
40 with the variation of the positional relationship of card slot 30 when changing), switch unit 12 is exported according to first detection signal and processor 14
Current control signal and it is in the conductive state so that power supply unit 11 stop to composite card 40 provide operating voltage, guarantee
Composite card 40 will not occur short circuit and burn card phenomenon when pulling out card because of stopping providing operating voltage not in time.
For example, if detection unit 13 can detect the second detection signal, processor when composite card 40 is inserted in card slot 30
14 export second control signal to power supply unit 11 is corresponding according to the second detection signal, and power supply unit 11 is according to second control signal
Operating voltage is provided to composite card 40；When composite card 40 is extracted from card slot 30, detection unit 13 can detect the first detection
Signal, processor 14 export first control signal, 11 basis of power supply unit to power supply unit 11 is corresponding according to first detection signal
First control signal stops providing operating voltage to composite card 40.If processor 14 is in the positional relationship of composite card 40 and card slot 30
The 100ms that can be delayed when variation can just export the control signal after the positional relationship variation of composite card 40 and card slot 30, that is, combine
The preceding 100ms time inner treater 14 that card 40 is extracted from card slot 30 still continues to output second control signal, power supply unit 11
Still it will continue to provide operating voltage to composite card 40；In composite card 40 out of, time after the 100ms extracted in card slot 30
Processor 14 can just export corresponding first control signal, and power supply unit 11 can just stop providing operating voltage to composite card 40.
Since switch unit 12 understands according to first detection signal and second control signal fast conducting, and then power supply unit 11 will be changed
Received second control signal stops providing operating voltage to composite card 40 to control power supply unit 11.
Optionally, it is based on burn-out-proof card circuit 10 shown in FIG. 1, the utility model embodiment also provides a kind of switch unit 12
Possible implementation, specifically, as shown in Fig. 2, the switch unit 12 includes diode D1, the cathode of diode D1 and detection
Unit 13 is electrically connected, and the anode of diode D1 is electrically connected between processor 14 and power supply unit 11.
In the present embodiment, diode D1 is used for when composite card 40 is extracted from card slot 30, according to first detection signal
And the current control signal conducting that processor 14 exports.
It is appreciated that the first detection signal that detection unit 13 obtains is low when composite card 40 is extracted from card slot 30
Level signal (such as 0V), the current control signal that processor 14 exports is high level signal (such as 5V), due to diode D1
Anode be high level signal, cathode is low level signal, then diode D1 will be connected, the conducting pressure of general diode D1
It is reduced to 0.3V, therefore the anode tap voltage of diode D1 can be pulled low to 0.3V after diode D1 conducting, due to power supply unit 11
It is electrically connected with the anode of diode D1, therefore power supply unit 11 will receive the low level signal of 0.3V, power supply unit 11 is receiving
It can stop providing operating voltage to composite card 40 when 0.3V low level signal.
Since the turn-on time of diode D1 is generally 1ms, and processor 14 exports corresponding control according to detection signal
Signal probably needs 100ms, so the burn-out-proof card circuit 10 can pass through diode when composite card 40 is extracted from card slot 30
D1, which can be realized quickly control power supply unit 11, to be stopped providing operating voltage, and then avoids the appearance that card phenomenon is burnt in short circuit.
In the present embodiment, diode D1 can use Schottky diode, specifically, model can be used
The Schottky diode of PMEG4010CEA.
Optionally, it is based on burn-out-proof card circuit 10 shown in FIG. 1, the utility model embodiment also provides a kind of power supply unit 11
Possible implementation, specifically, linear voltage regulator U1 includes making as shown in figure 3, power supply unit 11 includes linear voltage regulator U1
Energy end, the anode of diode D1 are electrically connected between processor 14 and enable end.
In the present embodiment, linear voltage regulator U1 is used to stop in diode D1 conducting to provide work electricity to composite card 40
Pressure.
It is appreciated that the enable end of linear voltage regulator U1 receives the low level signal of 0.3V in diode D1 conducting, make
When receiving low level signal, linear voltage regulator U1 can then stop working, i.e. linear voltage regulator U1 will not be to composite card at energy end
40 provide operating voltage.
Further, in the present embodiment, linear voltage regulator U1 further includes input terminal, and input terminal is electrically connected with system power supply 20
It connects.
In the present embodiment, linear voltage regulator U1 is for proposing system power supply 20 when composite card 40 is inserted in card slot 30
The system voltage of confession is converted to operating voltage.
It is appreciated that the second detection signal that detection unit 13 is exported when detecting that composite card 40 is inserted in card slot 30
For high level signal (i.e. 5V), and the second control signal of the corresponding output of processor 14 is also high level signal (i.e. 5V), then
The enable end of linear voltage regulator U1 receives high level signal, and when receiving high level signal, linear voltage regulator U1 is then for enable end
System voltage can be carried out to be converted to operating voltage, simultaneously because the cathode and anode of diode D1 are high level signal,
Diode D1 is in an off state.
Further, in the present embodiment, linear voltage regulator U1 further includes output end, and output end is electrically connected with card slot 30.
In the present embodiment, linear voltage regulator U1 is used to pass through when composite card 40 is inserted in card slot 30 output end for work
Make voltage output to card slot 30.
It is appreciated that card slot 30 includes voltage input end and voltage output end, the voltage input end of card slot 30 and linear steady
The output end of depressor U1 is electrically connected；When composite card 40 is inserted in card slot 30, the voltage output end and composite card 40 of card slot 30
Electrical connection；When composite card 40 is not inserted into card slot 30, voltage output end and the composite card 40 of card slot 30 are disconnected.Therefore it is logical
Composite card 40 can be provided to for the operating voltage that linear voltage regulator U1 output end exports by crossing card slot 30.
In the present embodiment, the model that linear voltage regulator U1 is used can be for, but is not limited to WL2817DA30-8/TR.
Optionally, it is based on power supply unit 11 shown in Fig. 3, it further includes that the utility model embodiment, which provides power supply unit 11,
One resistance, specifically, as shown in figure 4, one end of first resistor R1 is electrically connected with enable end, another termination of first resistor R1
Ground.
It is appreciated that first resistor R1 is for guaranteeing the received high level signal in the enable end of linear voltage regulator U1 or low electricity
Ordinary mail number it is in stable condition, avoid the occurrence of unstable state.
In the present embodiment, the resistance value size of first resistor R1 can be set according to the actual situation, not made herein
Limitation.
Further, in the present embodiment, power supply unit 11 further includes second resistance R2, one end processing of second resistance R2
Device 14 is electrically connected, and the other end of second resistance R2 is electrically connected with enable end, and the anode of diode D1 is electrically connected to second resistance R2
The other end and enable end between.
It is appreciated that second resistance R2 is for preventing electrostatic and surge to damage caused by processor 14.
In the present embodiment, the resistance value size of second resistance R2 can be set according to the actual situation, not made herein
Limitation.
Further, in the present embodiment, power supply unit 11 further includes first capacitor C1, one end of first capacitor C1 and line
Property voltage-stablizer U1 input terminal electrical connection, the other end ground connection of first capacitor C1.
It is appreciated that first capacitor C1 is used to be filtered, in the system voltage that filtering appts power supply 20 provides
Interference signal.
In the present embodiment, the capacitance size of first capacitor C1 can be configured according to the actual situation, not made herein
It limits.
Further, in the present embodiment, power supply unit 11 further includes the second capacitor C2, one end of the second capacitor C2 with it is defeated
Outlet electrical connection, the other end ground connection of the second capacitor C2.
It is appreciated that the second capacitor C2 filters out the interference signal in operating voltage, obtains more for being filtered
Stable operating voltage.
In the present embodiment, the capacitance size of the second capacitor C2 can be configured according to the actual situation, not made herein
It limits.
In the present embodiment, detection unit 13 may include contact flat spring, then can detecte out group by the contact flat spring
Card 40 is closed to be inserted into card slot 30 or extract from card slot 30.It is appreciated that when composite card 40 is inserted in card slot 30,
The dynamic point and dead point of contact flat spring are in contact condition, i.e. the dynamic point of contact flat spring and dead point is in connection status, detection
Corresponding the second detection of the output signal when the dynamic point of contact flat spring is in contact condition with dead point of unit 13；When composite card 40 is from card
When extracting in slot 30, the dynamic point and dead point of contact flat spring are in not in contact with state, i.e. the dynamic point of contact flat spring and dead point is place
In the state that disconnects, corresponding first inspection of output when the dynamic point of contact flat spring is in dead point not in contact with state of detection unit 13
Survey signal.
In the present embodiment, above-mentioned burn-out-proof card circuit 10 can be applied in the electronic device 1, optionally, such as Fig. 5 institute
Show, is the possible implementation of a kind of electronic equipment 1 provided by the embodiment of the utility model, which further includes system
Power supply 20 and card slot 30, burn-out-proof card circuit 10 and system power supply 20 can card slot 30 be electrically connected.
In the present embodiment, composite card 40 may include SIM card and SD card etc., and electronic equipment 1 can be mobile phone, plate electricity
Brain (personal digital assistant, PAD), mobile Internet access device (mobile Internet device, MID) or
Wearable device (Wearable Device) etc..
In conclusion burn-out-proof card circuit provided by the utility model and electronic equipment: the burn-out-proof card circuit includes power supply list
Member, switch unit, detection unit and processor, processor are electrically connected with power supply unit and detection unit, and the one of switch unit
End is electrically connected with detection unit, and the other end of switch unit is electrically connected between processor and power supply unit；Detection unit is used for
It detects and obtains first detection signal when composite card is extracted from card slot；Switch unit in composite card from card slot for extracting
When, according to the current control signal conducting that first detection signal and processor export, and controls power supply unit and stop to composite card
Operating voltage is provided, wherein current control signal is the control signal that processor is exported when composite card is inserted in card slot.It can
See, when composite card is extracted from card slot, processor will not immediately carry out the change of control signal, also will continue to by combination card insertion
The control signal obtained when entering in card slot is exported to power supply unit；In the control that composite card is extracted from card slot and processor exports
When signal processed does not carry out corresponding change, power supply unit is controlled by switch unit and stops providing operating voltage to composite card, it can
The phenomenon that blocking is burnt to prevent from pulling out appearance short circuit during card.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of burn-out-proof card circuit, which is characterized in that including power supply unit, switch unit, detection unit and processor, the place
Reason device is electrically connected with the power supply unit and the detection unit, and one end of the switch unit is electrically connected with the detection unit
It connects, the other end of the switch unit is electrically connected between the processor and the power supply unit；
The detection unit is for exporting first detection signal when detecting that composite card is extracted from card slot；
The switch unit is used for when the composite card is extracted from the slot, according to the first detection signal and described
The current control signal conducting of processor output, wherein the current control signal is that the processor is inserted into the composite card
The control signal exported when in the card slot；
The power supply unit provides operating voltage to the composite card for stopping in the switching means conductive.
2. burn-out-proof card circuit according to claim 1, which is characterized in that the switch unit includes diode, and described two
The cathode of pole pipe is electrically connected with the detection unit, and the anode of the diode is electrically connected to the processor and the power supply list
Between member；
The diode is used for when the composite card is extracted from the slot, according to the first detection signal and the place
Manage the current control signal conducting of device output.
3. burn-out-proof card circuit according to claim 2, which is characterized in that the power supply unit includes linear voltage regulator, institute
Stating linear voltage regulator includes enable end, and the anode of the diode is electrically connected between the processor and the enable end；
The linear voltage regulator provides operating voltage to the composite card for stopping in the diode current flow.
4. burn-out-proof card circuit according to claim 3, which is characterized in that the power supply unit further includes first resistor, institute
The one end for stating first resistor is electrically connected with the enable end, the other end ground connection of the first resistor.
5. burn-out-proof card circuit according to claim 3, which is characterized in that the power supply unit further includes second resistance, institute
The one end for stating second resistance is electrically connected with the processor, and the other end of the second resistance is electrically connected with the enable end, institute
The anode for stating diode is electrically connected between the other end of the second resistance and the enable end.
6. burn-out-proof card circuit according to claim 3, which is characterized in that the linear voltage regulator further includes input terminal, institute
Input terminal is stated to be electrically connected with a system power supply；
The linear voltage regulator is used for the system for providing the system power supply when the composite card is inserted in the card slot
Voltage is converted to the operating voltage.
7. burn-out-proof card circuit according to claim 6, which is characterized in that the power supply unit further includes first capacitor, institute
The one end for stating first capacitor is electrically connected with the input terminal, the other end ground connection of the first capacitor.
8. burn-out-proof card circuit according to claim 3, which is characterized in that the linear voltage regulator includes output end, described
Output end is electrically connected with the card slot；
The linear voltage regulator is used for the work when the composite card is inserted in the card slot through the output end
Voltage output is to the card slot.
9. burn-out-proof card circuit according to claim 8, which is characterized in that the power supply unit further includes the second capacitor, institute
The one end for stating the second capacitor is electrically connected with the output end, the other end ground connection of second capacitor.
10. a kind of electronic equipment, which is characterized in that including burn-out-proof card circuit described in any one of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822211146.7U CN209000056U (en) | 2018-12-26 | 2018-12-26 | A kind of burn-out-proof card circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822211146.7U CN209000056U (en) | 2018-12-26 | 2018-12-26 | A kind of burn-out-proof card circuit and electronic equipment |
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| CN209000056U true CN209000056U (en) | 2019-06-18 |
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| CN201822211146.7U Active CN209000056U (en) | 2018-12-26 | 2018-12-26 | A kind of burn-out-proof card circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023155569A1 (en) * | 2022-02-18 | 2023-08-24 | Oppo广东移动通信有限公司 | Electric spark elimination apparatus, adapter, and power supply system |
-
2018
- 2018-12-26 CN CN201822211146.7U patent/CN209000056U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023155569A1 (en) * | 2022-02-18 | 2023-08-24 | Oppo广东移动通信有限公司 | Electric spark elimination apparatus, adapter, and power supply system |
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