CN206301236U - A kind of protection circuit and digital control system - Google Patents
A kind of protection circuit and digital control system Download PDFInfo
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- CN206301236U CN206301236U CN201621399713.0U CN201621399713U CN206301236U CN 206301236 U CN206301236 U CN 206301236U CN 201621399713 U CN201621399713 U CN 201621399713U CN 206301236 U CN206301236 U CN 206301236U
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Abstract
The utility model provides a kind of protection circuit and digital control system, and the protection circuit includes voltage detecting circuit, control circuit and data storage circuit.Voltage detecting circuit detects power supply terminal voltage value, and the first signal is exported when the magnitude of voltage for detecting is higher than predetermined threshold value, and secondary signal is exported when the magnitude of voltage for detecting is less than predetermined threshold value.The input of circuit is controlled to be connected with the output end of voltage detecting circuit, when controlling circuit to receive the first signal, then normal work and the 3rd signal of output, when controlling circuit to receive secondary signal, are then stopped.The input of data storage circuit is connected with the output end of control circuit, when data storage circuit receives three signals, write operation is carried out to system data information, is otherwise stopped and preserves the system data information write before being stopped.The protection circuit that the utility model is provided can effectively maintain system data when supply voltage is too low, ensure system operation safety.
Description
Technical field
The utility model is related to Data Protection Technologies field, in particular to a kind of protection circuit and digital control system.
Background technology
Machine tool data is in the relevant data of each side needed for specific lathe by a number of units control system adaptation.In numerical control system
When system is in abnormal operation, system often carries out some maloperations, so as to cause the system number to being preserved in memory
According to influence.If in this way, can not effectively be preserved to the normal system data of digital control system, after system is restarted, system
Maloperation, influence System Operation efficiency and running safety can be carried out according to the information preserved under abnormal conditions.
In the prior art, system data preservation is carried out using dynamic RAM or SRAM, in system
After power-off, the information for being stored disappears therewith, or need provide back-up source carry out the power supply after system cut-off supply,
The system data that cannot be carried out exactly under system worked well situation is preserved, and be increased system architecture, be there are maintenance issues.
Utility model content
In view of this, the purpose of the utility model embodiment is, there is provided a kind of protection circuit and digital control system are solving
Above mentioned problem.
The utility model preferred embodiment provides a kind of protection circuit, including voltage detecting circuit, control circuit and number
According to circuit is preserved, the voltage detecting circuit be connected with power end, it is described control to be electrically connected to the voltage detecting circuit with
Between the data storage circuit；
The voltage detecting circuit detects the magnitude of voltage of power end, is exported when the magnitude of voltage for detecting is higher than predetermined threshold value
First signal, secondary signal is exported when the magnitude of voltage for detecting is less than predetermined threshold value；
The input of the control circuit is connected with the output end of the voltage detecting circuit, when the control circuit is received
To the voltage detecting circuit output the first signal when, then normal work and export the 3rd signal, when it is described control circuit connect
When receiving the secondary signal of the voltage detecting circuit output, then it is stopped；
The input of the data storage circuit is connected with the output end of the control circuit, when the data storage circuit
When receiving three signal of the control circuit output, write operation is carried out to system data information, be otherwise stopped and protect
Deposit the system data information write before being stopped.
Further, the voltage detecting circuit include voltage detection unit, the first pull-up resistor, the first pull down resistor and
Triode；
The voltage input end of the voltage detection unit is connected with power end, the connection of the base stage of output end and triode；Institute
The colelctor electrode for stating triode is connected with power supply, emitter stage is connected with the input of the control circuit；First pull-up resistor
One end be connected with the output end of the voltage detection unit and the base stage of the triode respectively, another termination power；It is described
One end of first pull down resistor is connected with the emitter stage of the triode, other end ground connection.
Further, the voltage detecting circuit also includes filter circuit, one end of the filter circuit respectively with power supply
Voltage input end connection, the other end of end and the voltage detection unit respectively with the earth terminal of the voltage detection unit and greatly
Ground connection, the filter circuit is included for filtering the first filter capacitor of power supply low-frequency ripple and for filtering power supply high frequency line
Second filter capacitor of ripple；
One end of first filter capacitor is connected with the voltage input end of power end and the voltage detection unit respectively,
The other end is connected with the earth terminal and the earth of the voltage detection unit respectively；
One end of second filter capacitor is connected with the voltage input end of power end and the voltage detection unit respectively,
The other end is connected with the earth terminal and the earth of the voltage detection unit respectively.
Further, the voltage detecting circuit also includes the first current-limiting resistance and the second current-limiting resistance；
One end of first current-limiting resistance is connected with the base stage of the triode, the other end respectively with the voltage detecting
One end connection of the output end of unit and first pull-up resistor；
One end of second current-limiting resistance with it is described control circuit input be connected, the other end respectively with three pole
One end connection of the emitter stage of pipe and first pull down resistor.
Further, the control circuit includes control unit and the second pull-up resistor；
The Enable Pin of described control unit is connected with one end of second current-limiting resistance, data output end and the data
Preserve the input connection of circuit；
One end of second pull-up resistor is connected with the data input pin of described control unit, another termination power.
Further, the control circuit also includes for filtering the 3rd filter capacitor of power supply high frequency ripple, described the
One end of three filter capacitors is connected with the power input of power supply and described control unit respectively, other end ground connection.
Further, the data storage circuit includes memory cell and the 4th filter capacitor；
The chip Enable Pin of the memory cell is connected with the data output end of described control unit, is input into Enable Pin with electricity
Source connects；
One end of 4th filter capacitor is connected with the power access end of power supply and the memory cell respectively, the other end
It is connected with the earth terminal and the earth of the memory cell respectively.
Further, the memory cell is ferroelectric memory.
Further, the data storage circuit also includes the 3rd current-limiting resistance and the 4th current-limiting resistance；
One end of 3rd current-limiting resistance is connected with the input Enable Pin of the memory cell, another termination power；
One end of 4th current-limiting resistance is connected with the chip Enable Pin of the memory cell, another termination power.
Another preferred embodiment of the utility model provides a kind of digital control system, including protection circuit described above.
Compared to prior art, the utility model has the advantages that：
Protection circuit and digital control system that the utility model is provided, the voltage of power end is detected by voltage detecting circuit
Value, writes and preserves, in magnitude of voltage when magnitude of voltage is normal by controlling circuit control data preservation circuit to carry out system data
When relatively low, control data preserves circuit and stops write operation preserving the normal system data of system.System is avoided in voltage mistake
The influence that maloperation under low situation is caused to system data, can recover to normal condition in time after restarting systems, real
Showed in the case where no back-up source is powered, the timely preservation to system normal data, ensured System Operation safety and
Operational paradigm.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the utility model embodiment, below will be to be used needed for embodiment
Accompanying drawing be briefly described.It should be appreciated that the following drawings illustrate only some embodiments of the present utility model, therefore should not be by
Regard the restriction to scope as, for those of ordinary skill in the art, on the premise of not paying creative work, may be used also
Other related accompanying drawings are obtained with according to these accompanying drawings.
A kind of schematic block diagram of protection circuit that Fig. 1 is provided for the utility model embodiment.
The circuit theory diagrams of the voltage detecting circuit that Fig. 2 is provided for the utility model embodiment.
The circuit theory diagrams of the control circuit that Fig. 3 is provided for the utility model embodiment.
The circuit theory diagrams of the data storage circuit that Fig. 4 is provided for the utility model embodiment.
Icon：10- protection circuits；100- voltage detecting circuits；U1- voltage detection units；The pull-up resistors of R1- first；R2-
First pull down resistor；The current-limiting resistances of R3- first；The current-limiting resistances of R4- second；110- filter circuits；The filter capacitors of C1- first；C2-
Second filter capacitor；T- triodes；200- controls circuit；U2- control units；The pull-up resistors of R5- second；The filtered electricals of C3- the 3rd
Hold；300- data storage circuits；U3- memory cell；The current-limiting resistances of R6- the 3rd；The current-limiting resistances of R7- the 4th；The filtered electricals of C4- the 4th
Hold.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe.Obviously, described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.The component of the utility model embodiment generally described and illustrated in accompanying drawing herein can be with a variety of configurations
To arrange and design.Therefore, the detailed description of embodiment of the present utility model below to providing in the accompanying drawings is not intended to limit
The claimed scope of the present utility model of system, but it is merely representative of selected embodiment of the present utility model.It is new based on this practicality
The embodiment of type, the every other embodiment that those skilled in the art are obtained on the premise of creative work is not made,
Belong to the scope of the utility model protection.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it need not be further defined and explained in subsequent accompanying drawing.
Fig. 1 is referred to, is a kind of schematic block diagram of protection circuit 10 that the utility model embodiment is provided.As schemed
Shown in 1, the protection circuit 10 includes voltage detecting circuit 100, control circuit 200 and data storage circuit 300.The voltage inspection
Slowdown monitoring circuit 100 is connected with power end, and the control circuit 200 is connected to the voltage detecting circuit 100 and the data are preserved
Between circuit 300.
The voltage detecting circuit 100 detects the magnitude of voltage of power end, when the magnitude of voltage for detecting is higher than predetermined threshold value
The first signal is exported, secondary signal is exported when the magnitude of voltage for detecting is less than predetermined threshold value.The input of the control circuit 200
End is connected with the output end of the voltage detecting circuit 100, when the control circuit 200 receives the voltage detecting circuit
During the first signal of 100 outputs, then normal work and the 3rd signal of output, control circuit 200 to receive the voltage when described
During the secondary signal of the detection output of circuit 100, then it is stopped.The input of the data storage circuit 300 and the control
The output end connection of circuit 200, when the data storage circuit 300 receives the 3rd signal of control circuit 200 output
When, write operation is carried out to system data information, otherwise it is stopped and preserves the system number write before being stopped
It is believed that breath.
Specifically, Fig. 2 is referred to, is the circuit theory diagrams of the voltage detecting circuit 100 that the utility model embodiment is provided.
As shown in Fig. 2 the voltage detecting circuit 100 is including under voltage detection unit U1, triode T, the first pull-up resistor R1, first
Pull-up resistor R2, the first current-limiting resistance R3 and the second current-limiting resistance R4.
The voltage detection unit U1 includes voltage input end, earth terminal and output end.The voltage input end and power supply
Connection, the earth terminal ground connection.The first current-limiting resistance R3 be connected to the output end of the voltage detection unit U1 with it is described
Between the base stage of triode T.The colelctor electrode of the triode T connects power supply, first pull down resistor of connection all the way of emitter stage
Ground connection, another road are connected after connecting the second current-limiting resistance R4 with the input of the control circuit 200 after R2.It is described
One end of first pull-up resistor R1 is respectively with the one of the output end of the voltage detection unit U1 and the first current-limiting resistance R3
End connection, another termination power.
Alternatively, in the present embodiment, the voltage detection unit U1 uses the reset coil of model MAX809JD
Piece, can be used to monitor the supply voltage of microcontroller and system.The first current-limiting resistance R3 and the second current-limiting resistance R4
Resistance be respectively 300 Ω and 0 Ω, wherein the second current-limiting resistance R4 also act as suppress power supply noise effect.Described
The resistance of one pull-up resistor R1 and the first pull down resistor R2 is 10K Ω.
Alternatively, the voltage detecting circuit 100 also includes filter circuit 110, and one end of the filter circuit 110 is distinguished
It is connected with the voltage input end of power end and the voltage detection unit U1, the other end is respectively with the voltage detection unit U1's
Earth terminal and the earth are connected.The filter circuit 110 includes the first filter capacitor C1 and the second filter capacitor C2.Wherein, it is described
First filter capacitor C1 is 10uF, can be used to filter the low-frequency ripple in power supply.The second filter capacitor C2 is 0.1uF, can
For filtering the high frequency ripple in power supply.
By above-mentioned design, it is capable of achieving：The voltage detection unit U1 detects the magnitude of voltage of power end, when the electricity for detecting
When pressure value is less than threshold voltage, such as 4.6V, then the first pull-up resistor R1 can be by connecting the voltage detection unit U1
After be grounded, and then the base stage of the triode T is low level, and the triode T cannot turn on.Then the second current-limiting resistance R4
It is grounded after connecting the first pull down resistor R2 so that the output end POWDN of the voltage detecting circuit 100 is output as low electricity
It is flat.
When the magnitude of voltage of power end that voltage detection unit U1 detections are obtained is higher than predetermined threshold value, i.e., magnitude of voltage is being just
Often, then the base stage of the triode T connects the first current-limiting resistance R3, the first pull-up resistor R1 and is followed by power supply, i.e. institute
The base stage of triode T is stated for high level, now the triode T conductings.Then the second current-limiting resistance R4 connects three pole
The emitter stage of pipe T so that the output end POWDN of the voltage detecting circuit 100 is output as high level.
Fig. 3 is referred to, is the circuit theory diagrams of the control circuit 200 that the utility model embodiment is provided.As shown in figure 3,
The control circuit 200 includes control unit U2, the second pull-up resistor R5 and the 3rd filter capacitor C3.
Described control unit U2 includes Enable Pin, data input pin, data output end, power input and earth terminal.Institute
The Enable Pin of control unit U2 is stated to be connected with the output end POWDN of the voltage detecting circuit 100.The second pull-up resistor R5
One end be connected with the data input pin of described control unit U2, another termination power.One end of the 3rd filter capacitor C3
It is connected with the power input and power supply of described control unit U2 respectively, the other end is grounded.
Alternatively, in the present embodiment, described control unit U2 uses the monobus buffered gate of model 1G126.It is described
The resistance of the second pull-up resistor R5 is 10K Ω.The 3rd filter capacitor C3 is 0.1uF, can be used to filter the high frequency in power supply
Ripple.
Alternatively, the data input pin of described control unit U2 connects power supply after connecting the second pull-up resistor R5, should
Data input pin is high level, when the Enable Pin input of described control unit U2 is all high level, described control unit U2's
Data output end is high level, i.e., the described output F_CE for controlling circuit 200 is high level.If the enable of described control unit U2
When end input is for low level, described control unit U2 is stopped, i.e., described to control the output F_CE of circuit 200 be zero.
Fig. 4 is referred to, is the circuit theory diagrams of the data storage circuit 300 that the utility model embodiment is provided.Such as Fig. 4 institutes
Show, the data storage circuit 300 includes memory cell U3, the 3rd current-limiting resistance R6, the filtering of the 4th current-limiting resistance R7 and the 4th
Electric capacity C4.
The memory cell U3 includes chip Enable Pin, input Enable Pin, power input and earth terminal.The chip makes
Energy end is connected with the data output end F_CE of described control unit U2.One end of the 3rd current-limiting resistance R6 is single with the storage
The input Enable Pin connection of first U3, another termination power.One end of the 3rd current-limiting resistance R6 is with the memory cell U3's
The connection of chip Enable Pin, another termination power.One end of the 4th filter capacitor C4 respectively with power supply and the memory cell
Power access end connection, the other end of U3 are connected with the earth terminal and the earth of the memory cell U3 respectively.
Alternatively, in the present embodiment, the memory cell U3 uses the ferroelectric memory of model FM18L08.
The resistance of the 3rd current-limiting resistance R6 and the 4th current-limiting resistance R7 is 10K Ω.The 4th filter capacitor C4 is
0.1uF, can be used to filter the high frequency ripple in power supply.
FM18L08 is the Nonvolatile ferroelectric random access memory being fabricated by using advanced ferroelectricity technology, different from other
The need for back-up source SRAM (Static Random Access Memory, SRAM).FM18L08 has
Natural non-volatile memory mechanism, therefore without backup battery.
Alternatively, the chip Enable Pin in the memory cell U3 receives the high level of described control unit U2 outputs
Afterwards, the memory cell U3 can carry out write operation, by system data, such as coordinate value, the electric parameter of Digit Control Machine Tool etc., write-in
In the memory cell U3, and data preservation can be carried out while write-in.When the chip of the memory cell U3 is enabled
End cannot receive the output signal of described control unit U2, then it represents that now the voltage of power end is in abnormal state, this
Shi Suoshu memory cell U3 then stops write operation, and is stored in the data for stopping being write before write operation.Because when power supply electricity
When pressing abnormal, system often occurs maloperation, if operating state data of the system in normal work can not be preserved in time,
Then after restarting systems, system cannot restart work according to normal parameter.
Alternatively, another preferred embodiment of the utility model additionally provides a kind of digital control system, and the digital control system includes
Protection circuit 10 described above.The protection circuit 10 includes that voltage detecting circuit 100, control circuit 200 and data are preserved
Circuit 300.The digital control system of the protection circuit 10 is included, in the case where supply voltage is too low, can effectively be protected
System data during deposit system normal work, it is to avoid influence of the system misoperation to system data under abnormal operating mode so that weight
After new activation system, system can be operated according to normal parameter, ensure System Operation safety.
In sum, the utility model is provided protection circuit 10 and digital control system, the protection circuit 10 include voltage
Detection circuit 100, control circuit 200 and data storage circuit 300.The voltage detecting circuit 100 detects power supply terminal voltage value,
When the magnitude of voltage for detecting belongs to normal range (NR), then the data storage circuit 300 pairs is controlled by the control circuit 200
System data carries out write operation and preserves the system data of write-in.When the magnitude of voltage for detecting is too low, then the data are controlled
Preserve circuit 300 to be stopped, to preserve the system data under system worked well state, to avoid system in brownout work
The influence that maloperation under condition is caused to system data, so that normal work shape can be quickly recovered to after restarting systems
State, improves system operation safety and operational efficiency.
In description of the present utility model, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " sets
Put ", " connection " should be interpreted broadly, for example, it may be being fixedly connected, or being detachably connected, or be integrally connected.Can
Being to mechanically connect, or electrically connect.Can be joined directly together, it is also possible to be indirectly connected to by intermediary, Ke Yishi
Two connections of element internal.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in utility model.
, it is necessary to explanation in description of the present utility model, term " on ", the orientation of the instruction such as D score or position relationship
It is or the orientation or position that the utility model product is usually put when using based on orientation shown in the drawings or position relationship
Relation, is for only for ease of description the utility model and simplifies description, must rather than the device or element for indicating or imply meaning
Must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.This
Outward, term " first ", " second ", " the 3rd ", " the 4th " etc. are only used for distinguishing description, and it is not intended that indicating or implying relative
Importance.
Preferred embodiment of the present utility model is the foregoing is only, the utility model is not limited to, for this
For the technical staff in field, the utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle
Within, any modification, equivalent substitution and improvements made etc. should be included within protection domain of the present utility model.
Claims (10)
1. a kind of protection circuit, it is characterised in that described including voltage detecting circuit, control circuit and data storage circuit
Voltage detecting circuit is connected with power end, and the control is electrically connected to the voltage detecting circuit and the data storage circuit
Between；
The voltage detecting circuit detects the magnitude of voltage of power end, and first is exported when the magnitude of voltage for detecting is higher than predetermined threshold value
Signal, secondary signal is exported when the magnitude of voltage for detecting is less than predetermined threshold value；
The input of the control circuit is connected with the output end of the voltage detecting circuit, when the control circuit receives institute
When stating the first signal of voltage detecting circuit output, then normal work and the 3rd signal of output, control circuit to receive when described
During the secondary signal of the voltage detecting circuit output, then it is stopped；
The input of the data storage circuit is connected with the output end of the control circuit, when the data storage circuit is received
To the control circuit output three signals when, write operation is carried out to system data information, be otherwise stopped and preserve and stop
The system data information write before only working.
2. protection circuit according to claim 1, it is characterised in that the voltage detecting circuit includes voltage detecting list
Unit, the first pull-up resistor, the first pull down resistor and triode；
The voltage input end of the voltage detection unit is connected with power end, the connection of the base stage of output end and triode；Described three
The colelctor electrode of pole pipe is connected with power supply, emitter stage is connected with the input of the control circuit；The one of first pull-up resistor
End is connected with the output end of the voltage detection unit and the base stage of the triode respectively, another termination power；Described first
One end of pull down resistor is connected with the emitter stage of the triode, other end ground connection.
3. protection circuit according to claim 2, it is characterised in that the voltage detecting circuit also includes filter circuit,
One end of the filter circuit is connected with the voltage input end of power end and the voltage detection unit respectively, the other end respectively with
The earth terminal and the earth of the voltage detection unit are connected, and the filter circuit is included for filtering the first of power supply low-frequency ripple
Filter capacitor and the second filter capacitor for filtering power supply high frequency ripple；
One end of first filter capacitor is connected with the voltage input end of power end and the voltage detection unit respectively, another
End is connected with the earth terminal and the earth of the voltage detection unit respectively；
One end of second filter capacitor is connected with the voltage input end of power end and the voltage detection unit respectively, another
End is connected with the earth terminal and the earth of the voltage detection unit respectively.
4. protection circuit according to claim 3, it is characterised in that the voltage detecting circuit also includes the first current limliting electricity
Resistance and the second current-limiting resistance；
One end of first current-limiting resistance is connected with the base stage of the triode, the other end respectively with the voltage detection unit
Output end and first pull-up resistor one end connection；
One end of second current-limiting resistance with it is described control circuit input be connected, the other end respectively with the triode
One end connection of emitter stage and first pull down resistor.
5. protection circuit according to claim 4, it is characterised in that the control circuit is included in control unit and second
Pull-up resistor；
The Enable Pin of described control unit is connected with one end of second current-limiting resistance, data output end is preserved with the data
The input connection of circuit；
One end of second pull-up resistor is connected with the data input pin of described control unit, another termination power.
6. protection circuit according to claim 5, it is characterised in that the control circuit also includes high for filtering power supply
3rd filter capacitor of frequency ripple, one end of the 3rd filter capacitor respectively with power supply and the power input of described control unit
End connection, other end ground connection.
7. protection circuit according to claim 6, it is characterised in that the data storage circuit includes memory cell and the
Four filter capacitors；
The chip Enable Pin of the memory cell is connected with the data output end of described control unit, is input into Enable Pin and power supply company
Connect；
One end of 4th filter capacitor is connected with the power access end of power supply and the memory cell respectively, other end difference
It is connected with the earth terminal and the earth of the memory cell.
8. protection circuit according to claim 7, it is characterised in that the memory cell is ferroelectric memory.
9. protection circuit according to claim 7, it is characterised in that the data storage circuit also includes the 3rd current limliting electricity
Resistance and the 4th current-limiting resistance；
One end of 3rd current-limiting resistance is connected with the input Enable Pin of the memory cell, another termination power；
One end of 4th current-limiting resistance is connected with the chip Enable Pin of the memory cell, another termination power.
10. a kind of digital control system, it is characterised in that including the protection circuit described in claim 1-9 any one.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621399713.0U CN206301236U (en) | 2016-12-20 | 2016-12-20 | A kind of protection circuit and digital control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621399713.0U CN206301236U (en) | 2016-12-20 | 2016-12-20 | A kind of protection circuit and digital control system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884666A (en) * | 2017-12-14 | 2018-04-06 | 威胜信息技术股份有限公司 | MBUS bus short circuits detect circuit and its detection method |
| CN113721682A (en) * | 2021-08-27 | 2021-11-30 | 广东维宁科技有限公司 | Control method and circuit for quickly reaching preset temperature |
| CN113904535A (en) * | 2021-12-09 | 2022-01-07 | 深圳市德兰明海科技有限公司 | Power switch circuit and power switch |
-
2016
- 2016-12-20 CN CN201621399713.0U patent/CN206301236U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884666A (en) * | 2017-12-14 | 2018-04-06 | 威胜信息技术股份有限公司 | MBUS bus short circuits detect circuit and its detection method |
| CN113721682A (en) * | 2021-08-27 | 2021-11-30 | 广东维宁科技有限公司 | Control method and circuit for quickly reaching preset temperature |
| CN113904535A (en) * | 2021-12-09 | 2022-01-07 | 深圳市德兰明海科技有限公司 | Power switch circuit and power switch |
| CN113904535B (en) * | 2021-12-09 | 2022-03-15 | 深圳市德兰明海科技有限公司 | Power switch circuit and power switch |
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Address after: Shiling Town Longquanyi stone District of Chengdu city Sichuan province 610000 Ling Xia Jie Patentee after: Chengdu Weida Guangtai CNC technology Limited by Share Ltd Address before: Shiling Town Longquanyi stone District of Chengdu city Sichuan province 610000 Ling Xia Jie Patentee before: Chengdu GREAT Industrial CO., Ltd. |
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| CP01 | Change in the name or title of a patent holder |