CN106058798A - Voltage protection device, method and wearable device - Google Patents
Voltage protection device, method and wearable device Download PDFInfo
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- CN106058798A CN106058798A CN201610389128.0A CN201610389128A CN106058798A CN 106058798 A CN106058798 A CN 106058798A CN 201610389128 A CN201610389128 A CN 201610389128A CN 106058798 A CN106058798 A CN 106058798A
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- input end
- resistor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- Protection Of Static Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present application provides a voltage protection device and method, and a wearable device. The device comprises a switch module and a voltage detection module. The voltage detection module is electrically connected with a voltage input end for detecting whether a voltage value of the voltage input end is greater than a voltage protection threshold; a control end of the switch module is electrically connected with the voltage input end and the voltage detection module; an output end of the switch module is electrically connected with a voltage output end; and when the voltage detection module detects that the voltage value of the voltage input end is greater than the voltage protection threshold, the switch module breaks the electric connection between the voltage input end and the voltage output end. The technical scheme of the present application can effectively prevent the damage to the wearable device due to continuous high voltage of the charger, and avoid the problem that a user need to repair the wearable device since the used charger does not match the wearable device.
Description
Technical field
The application relates to electronic technology field, particularly relates to a kind of voltage protection, method and wearable device.
Background technology
Along with rapid nitriding universal of electronic equipment for consumption, charger can be the electronics of difference charging voltage
Equipment is charged, and such as, charger of the prior art can be that electronic equipment provides tri-kinds of charging voltages of 5V, 9V, 12V.
For such as dressing the electronic equipments relatively low to the magnitude of voltage of charging voltage such as kind equipment, when user uses the voltage of charging voltage
When being worth higher charger for dressing kind equipment charging, the high pressure that can there is charger causes dressing the damage problem of kind equipment.
Summary of the invention
In view of this, the application provides a kind of new technical scheme, can avoid owing to the high-voltage charging of charger damages
Electronic equipment.
For achieving the above object, the application provides technical scheme as follows:
First aspect according to the application, it is proposed that a kind of voltage protection, including: switch module and voltage detecting
Module；Wherein,
Described voltage detection module electrically connects with voltage input end, for whether detecting the magnitude of voltage of described voltage input end
More than voltage protection threshold value；
The control end of described switch module electrically connects with described voltage input end and described voltage detection module, described switch
The outfan of module electrically connects with voltage output end, when described voltage detection module detects the magnitude of voltage of described voltage input end
During more than described voltage protection threshold value, described switch module is by the separated electricity of described voltage input end Yu described voltage output end
Connect.
Second aspect according to the application, it is proposed that a kind of voltage protection method, the electricity proposed by above-mentioned first aspect
Pressure protection device realizes, including:
By the magnitude of voltage of voltage detection module detection voltage input end whether more than voltage protection threshold value；
When described voltage detection module detects the magnitude of voltage of described voltage input end more than voltage protection threshold value, pass through
Described voltage input end is electrically connected by switch module with the separated of voltage output end.
The third aspect according to the application, it is proposed that a kind of wearable device, described equipment includes:
Processor；
For storing the memorizer of processor executable；
And the voltage protection that above-mentioned first aspect proposes, described voltage input end is electrically connected with the charging end of charging wire
Connecing, described voltage output end electrically connects with the charging end of described wearable device.
From above technical scheme, when voltage detection module, the application detects that the magnitude of voltage of voltage input end is more than electricity
During pressure protection threshold value, voltage input end is electrically connected by switch module with the separated of voltage output end, so that charger stops
To wearable device charge, effectively prevent the continuous high-pressure damage to wearable device of charger, it is to avoid user due to
Use the problem that charger unmatched with wearable device causes wearable device to be reprocessed.
Accompanying drawing explanation
Fig. 1 shows the structure chart of the voltage protection according to one example embodiment of the present invention；
Fig. 2 shows the structure chart of the voltage detection module according to one example embodiment of the present invention；
Fig. 3 shows the structural representation of the switch module according to one example embodiment of the present invention；
Fig. 4 shows the structural representation of voltage protection in accordance with a further exemplary embodiment of the present invention；
Fig. 5 shows the schematic flow sheet of the voltage protection method according to one example embodiment of the present invention；
Fig. 6 shows the structural representation of the wearable device according to one example embodiment of the present invention.
Detailed description of the invention
Here will illustrate exemplary embodiment in detail, its example represents in the accompanying drawings.Explained below relates to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represents same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they are only with the most appended
The example of the apparatus and method that some aspects that described in detail in claims, the application are consistent.
It is only merely for describing the purpose of specific embodiment at term used in this application, and is not intended to be limiting the application.
" a kind of ", " described " and " being somebody's turn to do " of singulative used in the application and appended claims is also intended to include majority
Form, unless context clearly shows that other implications.It is also understood that term "and/or" used herein refers to and wraps
Any or all containing one or more projects of listing being associated may combination.
Although should be appreciated that in the application possible employing term first, second, third, etc. to describe various information, but this
A little information should not necessarily be limited by these terms.These terms are only used for same type of information is distinguished from each other out.Such as, without departing from
In the case of the application scope, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as
One information.Depend on linguistic context, word as used in this " if " can be construed to " ... time " or " when ...
Time " or " in response to determining ".
For the application is further described, it is provided that the following example:
Fig. 1 shows the structure chart of the voltage protection according to one example embodiment of the present invention；As it is shown in figure 1,
Voltage protection includes: voltage detection module 11 and switch module 12, and voltage protection can be arranged on wearable setting
On standby 100.
Wherein, voltage detection module 11 electrically connects with voltage input end 10, for detecting the magnitude of voltage of voltage input end 10
Whether more than voltage protection threshold value；The control end of switch module 12 electrically connects with voltage input end 10 and voltage detection module 12,
The outfan of switch module 12 electrically connects with voltage output end 20, when voltage detection module 11 detects the electricity of voltage input end 10
When pressure value is more than voltage protection threshold value, voltage input end 10 is electrically connected by switch module 12 with the separated of voltage output end 20.
As a example by the charging voltage of wearable device 100 is as 5V illustrative, when wearable device 100 is by filling
When electrical equipment 200 charges, if charger 200 is 5V by voltage input end 10 to the charging voltage that wearable device 100 provides,
Voltage detection module 11, when magnitude of voltage voltage input end 10 being detected is less than voltage protection threshold value (such as, 5.5V), switchs
Module 12 controls to electrically connect between voltage input end 10 with voltage output end 20, so that charger 200 is wearable device 100
Charging；If charger 200 is 9V by voltage input end 10 to the charging voltage that wearable device 100 provides, voltage detecting
Module 11 is when magnitude of voltage voltage input end 10 being detected is more than voltage protection threshold value (such as, 5.5V), and switch module 12 is controlled
Voltage input end 10 processed electrically connects with the separated of voltage output end 20, makes charger 200 stop wearable device 100 and fills
Electricity.
Seen from the above description, detect that the magnitude of voltage of voltage input end is more than voltage protection threshold when voltage detection module 11
During value, voltage input end 10 is electrically connected by switch module 12 with the separated of voltage output end 20, so that charger 200 stops
Wearable device 100 is charged, effectively prevent the damage to wearable device 100 of the continuous high-pressure of charger 200, it is to avoid
The problem that user causes wearable device to be reprocessed owing to using charger unmatched with wearable device.
Fig. 2 shows the structure chart of the voltage detection module according to one example embodiment of the present invention；The present embodiment exists
On the basis of above-described embodiment, illustrative as a example by voltage detection module 11, as in figure 2 it is shown, voltage detection module
11 include: Zener diode 111 and the first resistor 112.
Wherein, one end of Zener diode 111 is electrically connected with voltage input end 10 by the first resistor 112, voltage stabilizing two
The other end of pole pipe 111 is connected to ground, and the breakdown reverse voltage of Zener diode 111 is voltage protection threshold value.
In one embodiment, the resistance value of the first resistor 112 can be determined by following equation (1):
Wherein, R1 is the resistance value of the first resistor, VinFor the magnitude of voltage of voltage input end, VzSteady for Zener diode
Determine voltage, IzReverse current for Zener diode.
Such as, V is worked asinDuring being gradually increased to 6V, the voltage of Zener diode 111 can progressively reach its reverse breakdown
Voltage 5.1V, when the voltage of Zener diode 111 reaches 5.1V, switch module 12 controls voltage input end 10 and exports with voltage
End 20 disconnection, controls the voltage V of voltage output end 200ut=0V, thus wearable device is played a protective role.Additionally, first
Resistor 112 can prevent Zener diode 111 excessive because of reverse current as the current limiting safeguard resistor of Zener diode 111
And cause Zener diode 111 to burn.
The performance plot of Zener diode 111 may refer to the description of prior art, and the application no longer describes in detail.
It will be appreciated by persons skilled in the art that above-mentioned Zener diode 111 and the first resistor 112 only show
Example illustrates, it can not form the restriction to voltage detection module 11, and voltage detection module 11 can also by voltage ratio relatively
The mode of device or controllable accurate source of stable pressure (such as, parallel voltage-stabilizing integrated circuit) realize, and such as, one of voltage comparator defeated
Enter end for by Vin, another input of voltage comparator is voltage protection threshold value, and this voltage protection threshold value is by wearable device
The magnitude of voltage needing starting protection when charging normal determines.
In the present embodiment, can be according to the different Zener diodes selecting different model of the charging voltage of wearable device
111 and first resistor 112, such that it is able to according to the protection class of different charging voltages select corresponding Zener diode and
First resistor, improves the motility when manufacturing wearable device.
Fig. 3 shows the structural representation of the switch module according to one example embodiment of the present invention；The present embodiment exists
It is on the basis of above-described embodiment, illustrative as a example by switch module 12, as it is shown on figure 3, switch module 12 comprises the steps that
First switch element 121 and second switch unit 122.
Wherein, the first switch element 121 includes the first control end, first input end, the first outfan；Second switch unit
122 include the second control end, the second input, the second outfan；First controls end electrically connects with voltage detection module 11, and first
Input electrically connects with voltage input end the 10, second input, and the first outfan and second controls end electrical connection, the second outfan
Electrically connect with voltage output end 20.
In one embodiment, switch module 12 may also include that the second resistor 123, one end of the second resistor 123 and the
One controls end electrical connection, and the other end of the second resistor 123 electrically connects with voltage detection module 11.By the second resistor 123
First switch element 121 can be carried out current limliting at the first electric current controlling end, to realize controlling the pass of the first switch element 121
Power-off pressure.
In one embodiment, the resistance value of the second resistor 123 is determined by following equation (2):
Wherein, R2 is the resistance value of the second resistor 123, VinFor the magnitude of voltage of voltage input end 10, VebIt it is the first switch
The cut-in voltage of unit 121, VzFor the burning voltage of Zener diode 111, I1It it is the input current of the first switch element.
In one embodiment, switch module 12 may also include that the 3rd resistor 124 and the 4th resistor 125；Wherein,
One end of three resistors 124 controls end with first and electrically connects, and the other end of the 3rd resistor 124 and the second outfan, voltage are defeated
Go out end 20 electrical connection；One end of 4th resistor 125 electrically connects with the first outfan, the second control end, the 4th resistor 125
The other end is connected to ground.
In one embodiment, the resistance value of the 3rd resistor 124 is determined by following equation (3):
Wherein, R3 is the resistance value of the 3rd resistor 124, and R4 is the resistance value of the 4th resistor 125, Vin1Protect for voltage
Protection unit determines the first preset voltage value of the voltage input end 10 when needing to start voltage protection, Vin2For voltage protection
Determining the second preset voltage value of voltage input end 10 when needing to start voltage protection, β is the electric current of the first switch element 121
Amplification, VbIt it is the magnitude of voltage of the first control end.
Such as, the input voltage value V of voltage input end 10inUsually there will be ripple, the existence of ripple can cause input electricity
Pressure value VinFluctuating in the range of one, such as, the voltage range that ripple is corresponding is between 5.9-6.1V, when voltage input end 10
Voltage VinNeed during=6V to start voltage protection, namely the voltage protection threshold value of wearable device is 6V, then Vin1Can set
It is set to 5.9V, Vin2Could be arranged to 6.1V；Voltage V when voltage input end 10inExcursion when being 5.9-6.1V, due to
Voltage protection threshold value is 6V, as input voltage value VinDuring more than 6V, switch module 12 can export with voltage by off voltage input
Electrical connection between end, causes output voltage values VoutIt is 0, as input voltage value VinDuring less than or equal to 6V, switch module 12
Can again will electrically connect between voltage input end with voltage output end, output voltage values VoutWith input voltage value VinIdentical, thus
Causing the wearable device charging voltage when charging to present a square wave, the form of expression of this square wave is 0 and VinIt is alternately distributed,
Wearable device is caused normally to be electrically charged；The application can charge normal in order to ensure wearable device, the most permissible
By Vin1It is set to 5.9V and by Vin2It is set to 6.1V, is calculated the resistance value of the 3rd resistor 124 by above-mentioned equation (3)
R3, by the back pressure effect of the 3rd resistor 124, at input voltage value VinDuring less than or equal to 6V, switch module 12 is still located
In open mode, it is ensured that charger can charge normal for wearable device.
It will be appreciated by persons skilled in the art that switch module 12 can also include a switch element or three with
On switch element, correspondingly, the annexation of each resistor in switch module 12 is also dependent on the number of switch element
And the effect of switch element and adjust, the application is to the number of switch element included in switch module 12 and corresponding
The annexation of resistor does not limits, as long as detecting that the magnitude of voltage of voltage input end is more than voltage in voltage detection module 11
During protection threshold value, it is possible to by switch module 12, voltage input end is electrically connected with the separated of voltage output end.
In the present embodiment, the first switch element 121 and second switch unit 122 as discrete device and can be encapsulated,
Such that it is able to enable voltage protection to meet the wearable device requirement to space；Additionally, due to the 3rd resistor 124
Back pressure effect, it can be ensured that at the input voltage value V of voltage input end 10inWhen there is ripple, into wearable device just it still is able to
Often charging.
Fig. 4 shows the structure chart of voltage protection in accordance with a further exemplary embodiment of the present invention；The present embodiment
On the basis of above-described embodiment, with the first switch element 121 for PNP type triode 1211 and second switch unit 122 it is
As a example by PMOS 1221 illustrative, as shown in Figure 4, base stage B of PNP type triode 1211 is the first control end, PNP
The emitting stage E of type audion 1211 is first input end, and the colelctor electrode C of PNP type triode 1211 is the first outfan.PMOS
The grid G of 1221 is the second control end, and the source S of PMOS 1221 is the second input, and the drain D of PMOS 1221 is second
Outfan.
The present embodiment can realize PMOS by utilizing the cut-off of PNP type triode 1211, amplification and saturated 3 intervals
The control of pipe 1221 switch, below with the burning voltage of Zener diode 111 as VzAs a example by=5.1V illustrative, its
In, the cut-in voltage V of PNP type triode 1211eb＞ 0.7V, conducting voltage V of PMOS 1221sg＞ 0.5V.
Magnitude of voltage V when voltage input end 10in＜ VzTime, flow through the electric current I of Zener diode 111zThe least, now, the
The one voltage V controlling endb≈Vin, due to Vin-Vb＜ 0.7V, therefore PNP type triode 1211 is in cut-off region, positive-negative-positive three pole
Pipe 1211 is not turned on, the voltage V of the second control end of PMOS 1221g≈ 0, PMOS 1221 turns on, Vin≈Vout, charger
200 charge normal for wearable device 100.
Magnitude of voltage V when voltage input end 10inIt is gradually increased, until PNP type triode 1211 is in magnification region, voltage
Value VinContinue to increase, when meeting Vin-Vg＜ VsgTime, PMOS 1221 is turned off, Vout=0；Work as VinContinue to increase, VgGradually add
Greatly, PNP type triode 1211 enters zone of saturation, and PMOS 1221 is fully turned off, wherein, and VgIt it is the electricity of the second control end
Pressure.
In one embodiment, at VinWhen being in voltage critical point, voltage protection can be in and repeatedly turns on and turn off shape
State, can prevent voltage protection at V by the 3rd resistor 124inIt is in conducting repeatedly and the shutoff of voltage critical point, tool
Body is described as follows:
With Vin1=6V and Vin2As a example by=5.5V illustrative, when voltage protection is normally opened, Vout
=Vin＞ Vb, the base current Ib=I1-I2 of PNP type triode 1211.When voltage protection controls off voltage input
10 with the separated electrical connection of voltage output end 20 time, Vout=0V, I2 are forward current, are equivalent to add positive-negative-positive three pole
The base current of pipe 1211, now Ib=I1+I2, under this kind of situation, Ib is I1 and I2's and value, normal with voltage protection
When opening Ib be I1 compared with the difference of I2D, the value of Ib is bigger, and by I3=β * Ib, β represents the electric current of PNP type triode 1211
Amplification, owing to the value of Ib is bigger, therefore I3 is bigger, the grid voltage V of PMOS 1221gBigger, PMOS 1221 is in
The time of off state is longer.
It will be appreciated by persons skilled in the art that above-mentioned only with the first switch element 121 for PNP type triode 1211 also
And second switch unit 122 is that PMOS 1221 is illustrative, it can not form the restriction to the application, if logical
Cross the mutual control between different switching component, with guarantee voltage protection control voltage input end and voltage output end it
Separated electrical connection, these different switching components all can be considered the first switch element 121 and second switch described herein
Unit 122.
In the present embodiment, owing to PNP type triode 1211, PMOS 1221 and Zener diode 111 are in prior art
A large amount of electronic devices used, cost is the lowest, and therefore the cost of the voltage protection in the present embodiment also can be the lowest；Due to
PNP type triode 1211, PMOS 1221 and Zener diode 111 are discrete device, the therefore encapsulation to voltage protection
Small package can be selected, catered to the demand that wearable device is little to volume；Furthermore, it is possible to according to different voltage protection grades
Select the PNP type triode 1211 of different model, PMOS 1221 and Zener diode 111, and then voltage protection can be made to fill
Put and there is different costs, improve the motility of manufacture.
Fig. 5 shows the schematic flow sheet of the voltage protection method according to one example embodiment of the present invention；This enforcement
Example can be realized, as it is shown in figure 5, comprise the steps: by the voltage protection that above-described embodiment provides
Whether step 501, by the magnitude of voltage of voltage detection module detection voltage input end more than voltage protection threshold value；
Step 502, when voltage detection module detects the magnitude of voltage of voltage input end more than voltage protection threshold value, passes through
Voltage input end is electrically connected by switch module with the separated of voltage output end.
In one embodiment, by the magnitude of voltage of voltage detection module detection voltage input end whether more than voltage protection threshold
Value, it may include:
Whether the magnitude of voltage of voltage input end is detected more than voltage stabilizing two pole by the Zener diode in voltage detection module
The breakdown reverse voltage of pipe, breakdown reverse voltage is voltage protection threshold value.
In one embodiment, by switch module, voltage input end is electrically connected with the separated of voltage output end, can wrap
Include:
After Zener diode is reversed and punctures, the first control end of the first switch element in switch module is low level
And the first input end of the first switch element is high level, and the first switch element is in the conduction state；
The second control end is high level and second switch unit second of second switch unit in switch module is defeated
Entering end is high level, and second switch unit is off state, thus by voltage input end and the separated electricity of voltage output end
Connect.
In one embodiment, method may also include that
When voltage detection module detects the magnitude of voltage of voltage input end less than or equal to voltage protection threshold value, switch
The first input end that first control end is high level and the first switch element of the first switch element in module is high level,
First switch element is off state；
The second control end is low level and second switch unit second of second switch unit in switch module is defeated
Entering end is high level, and second switch unit is in the conduction state, thus by second switch unit by voltage input end and voltage
Electrically connect between outfan.
About the method in above-described embodiment, wherein the concrete mode of each step is in the embodiment about this device
In be described in detail, the most no longer describe in detail.
Fig. 6 shows the structural representation of the wearable device according to one example embodiment of the present invention.Such as Fig. 6 institute
Showing, at hardware view, this wearable device includes processor, internal bus, COM1, memorizer, sensor, the most also may be used
Can include the hardware required for other business, such as, power management chip, charging chip, and charging port etc., above-mentioned enforcement
Voltage protection in example is connected between charging port and charging chip, the voltage input end of voltage protection and charging
Port electrically connects, and the voltage output end of voltage protection electrically connects with charging chip, and voltage protection can be above-mentioned electricity
Any one in pressure protection device embodiment.
Those skilled in the art, after considering description and putting into practice invention disclosed herein, will readily occur to its of the application
Its embodiment.The application is intended to any modification, purposes or the adaptations of the application, these modification, purposes or
Person's adaptations is followed the general principle of the application and includes the undocumented common knowledge in the art of the application
Or conventional techniques means.Description and embodiments is considered only as exemplary, and the true scope of the application and spirit are by following
Claim is pointed out.
Also, it should be noted term " includes ", " comprising " or its any other variant are intended to nonexcludability
Comprise, so that include that the process of a series of key element, method, commodity or equipment not only include those key elements, but also wrap
Include other key elements being not expressly set out, or also include want intrinsic for this process, method, commodity or equipment
Element.In the case of there is no more restriction, statement " including ... " key element limited, it is not excluded that including described wanting
Process, method, commodity or the equipment of element there is also other identical element.
The foregoing is only the preferred embodiment of the application, not in order to limit the application, all essences in the application
Within god and principle, any modification, equivalent substitution and improvement etc. done, should be included within the scope of the application protection.
Claims (15)
1. a voltage protection, it is characterised in that described device includes: switch module and voltage detection module；Wherein,
Described voltage detection module electrically connects with voltage input end, for detecting whether the magnitude of voltage of described voltage input end is more than
Voltage protection threshold value；
The control end of described switch module electrically connects with described voltage input end and described voltage detection module, described switch module
Outfan electrically connect with voltage output end, when described voltage detection module detects that the magnitude of voltage of described voltage input end is more than
During described voltage protection threshold value, described voltage input end is electrically connected by described switch module with the separated of described voltage output end
Connect.
Device the most according to claim 1, it is characterised in that described voltage detection module includes: Zener diode and
One resistor；Wherein,
One end of described Zener diode is electrically connected with described voltage input end by described first resistor, described voltage stabilizing two pole
The other end of pipe is connected to ground, and the breakdown reverse voltage of described Zener diode is described voltage protection threshold value.
Device the most according to claim 2, sees and it is characterized in that, the resistance value of described first resistor is by following equation
(1) determine:
Wherein, R1 is the resistance value of described first resistor, VinFor the magnitude of voltage of described voltage input end, VzFor described voltage stabilizing two
The burning voltage of pole pipe, IzReverse current for described Zener diode.
Device the most according to claim 2, it is characterised in that described switch module includes: the first switch element and second
Switch element；Wherein,
Described first switch element includes the first control end, first input end, the first outfan；Described second switch unit includes
Second controls end, the second input, the second outfan；
Described first controls end electrically connects with described voltage detection module, described first input end and described voltage input end, institute
Stating the second input electrical connection, described first outfan controls end with described second and electrically connects, and described second outfan is with described
Voltage output end electrically connects.
Device the most according to claim 4, it is characterised in that described switch module also includes: the second resistor, described
One end of two resistors controls end with described first and electrically connects, the other end of described second resistor and described voltage detection module
Electrical connection.
Device the most according to claim 5, it is characterised in that the resistance value of described second resistor is by following equation (2)
Determine:
Wherein, R2 is the resistance value of described second resistor, VinFor the magnitude of voltage of described voltage input end, VebOpen for described first
Close the cut-in voltage of unit, VzFor the burning voltage of described Zener diode, I1Input current for described first switch element.
Device the most according to claim 4, it is characterised in that described switch module also includes: the 3rd resistor and the 4th
Resistor；Wherein,
3rd resistor, one end of described 3rd resistor controls end with described first and electrically connects, described 3rd resistor another
One end electrically connects with described second outfan, described voltage output end；
4th resistor, one end of described 4th resistor electrically connects with described first outfan, described second control end, described
The other end of the 4th resistor is connected to ground.
Device the most according to claim 7, it is characterised in that the resistance value of described 3rd resistor is by following equation (3)
Determine:
Wherein, R3 is the resistance value of described 3rd resistor, and R4 is the resistance value of described 4th resistor, Vin1For described voltage
Protection device determines the first preset voltage value of voltage input end when needing to start voltage protection, Vin2For described voltage protection
Device determines the second preset voltage value of voltage input end when needing to start voltage protection, and β is described first switch element
Current amplification factor, VbFor the described first magnitude of voltage controlling end.
Device the most according to claim 4, it is characterised in that described first switch element is PNP type triode, described
The base stage of PNP type triode is described first control end, and the emitting stage of described PNP type triode is described first input end, institute
State the most described first outfan of current collection of PNP type triode.
Device the most according to claim 4, it is characterised in that described second switch unit is PMOS, described PMOS
Grid be described second control end, the source electrode of described PMOS is described second input, and the drain electrode of described PMOS is institute
State the second outfan.
11. 1 kinds of voltage protection method, are realized by the arbitrary described voltage protection of the claims 1-10, its feature
Being, described method includes:
By the magnitude of voltage of voltage detection module detection voltage input end whether more than voltage protection threshold value；
When described voltage detection module detects the magnitude of voltage of described voltage input end more than voltage protection threshold value, by switch
Described voltage input end is electrically connected by module with the separated of voltage output end.
12. methods according to claim 11, it is characterised in that described detect voltage input end by voltage detection module
Magnitude of voltage whether more than voltage protection threshold value, including:
Whether the magnitude of voltage of voltage input end is detected more than described voltage stabilizing two pole by the Zener diode in voltage detection module
The breakdown reverse voltage of pipe, described breakdown reverse voltage is voltage protection threshold value.
13. methods according to claim 12, it is characterised in that by switch module by described voltage input end and voltage
The separated electrical connection of outfan, including:
After described Zener diode is reversed and punctures, the first control end of the first switch element in described switch module is low
The first input end of level and described first switch element is high level, and described first switch element is in the conduction state；
Second control end of the second switch unit in described switch module is the of high level and described second switch unit
Two inputs are high level, and described second switch unit is off state, thus by voltage input end and voltage output end it
Separated electrical connection.
14. methods according to claim 11, it is characterised in that described method also includes:
When described voltage detection module detects that the magnitude of voltage of described voltage input end is less than or equal to described voltage protection threshold
During value, the first control end of the first switch element in described switch module is the of high level and described first switch element
One input is high level, and described first switch element is off state；
Second control end of the second switch unit in described switch module is the of low level and described second switch unit
Two inputs are high level, and described second switch unit is in the conduction state, thus by described second switch unit by voltage
Electrically connect between input and voltage output end.
15. 1 kinds of wearable devices, it is characterised in that described equipment includes:
Processor；
For storing the memorizer of processor executable；
And arbitrary described voltage protection, described voltage input end and the charging of charging wire in the claims 1-10
End electrical connection, described voltage output end electrically connects with the charging end of described wearable device.
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| CN201610389128.0A CN106058798B (en) | 2016-05-30 | 2016-05-30 | Voltage protection, method and wearable device |
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