CN106602534A - Protection device, power supply device and terminal - Google Patents
Protection device, power supply device and terminal Download PDFInfo
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- CN106602534A CN106602534A CN201611170222.3A CN201611170222A CN106602534A CN 106602534 A CN106602534 A CN 106602534A CN 201611170222 A CN201611170222 A CN 201611170222A CN 106602534 A CN106602534 A CN 106602534A
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- overvoltage protecting
- protection
- surge
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
- H02H9/047—Free-wheeling circuits
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Abstract
The invention provides a protection device, a power supply device and a terminal. The protection device comprises a first overvoltage protection unit, a surge protection unit and a second overvoltage protection unit, wherein the first overvoltage protection unit, the surge protection unit, the second overvoltage protection unit and a to-be-protected unit are sequentially connected in parallel between a power supply end VBUS and a ground end in a from-near-to-far distance to the power supply end VBUS, the overvoltage protection unit and the second overvoltage protection unit are respectively used for protecting the unit which is connected in parallel between the power supply end VBUS and the ground end and is more distant from the power supply end VBUS compared with the corresponding overvoltage protection unit from being influenced by a DC voltage when the DC voltage loaded on the corresponding overvoltage protection unit is equal to or greater than a corresponding threshold, and the surge protection unit is used for protecting the unit which is connected in parallel between the power supply end VBUS and the ground end and is more distant from the power supply end VBUS compared with the corresponding overvoltage protection unit from being influenced by a surge when a voltage or a current loaded on the corresponding overvoltage protection unit generates the surge. The protection device is advantaged in that a surge problem on a VBUS line is solved, a DC high voltage problem on the VBUS line can be solved, a client withdrawal rate is reduced, and user experience is improved.
Description
Technical field
The present invention relates to field of terminal technology, more particularly to a kind of protection device, electric supply installation and terminal.
Background technology
At present, mobile phone Anti-surging scheme has 3 kinds：
Scheme 1, on VBUS (USB voltages) circuit high-power surge pipe in parallel to GND (ground terminal)；
Scheme 2, on VBUS circuits to GND parallel connection OVP (Over Voltage Protection, overvoltage protection) chips；
Scheme 3, on VBUS circuits high-power surge pipe first in parallel to GND, in high-power surge pipe back again to GND simultaneously
Connection OVP chips.
The defect of prior art：
Scheme 1, high-power surge pipe only have protective action to the surge voltage or surge current of us (microsecond) rank, although
Peak power is very high, but mean power is relatively low, can burn quickly during the high direct voltage for running into ms (millisecond) rank, causes VBUS pair
GND is short-circuit, and now mobile phone causes visitor to move back due to charging；
When having high direct voltage on scheme 2, VBUS circuits, OVP chips can disconnect within the time of 100ns (nanosecond) rank
VBUS and the connection of rear end PMU (Power Management Unit, PMU) chip, protect back-end chip；But receive
It is limited to the area of OVP chips, its carrying out surge protection ability is weaker；When there is larger surge voltage, OVP chips can burn, i.e.,
OVP chips are short-circuit to GND, that is, VBUS is short-circuit to GND, and now mobile phone causes visitor to move back due to charging；
Although scheme 3, the protective capacities with higher surge and high direct voltage, when occurring ms ranks on VBUS circuits
During the high direct voltage of the above, OVP chips can disconnect the connection of VBUS and back-end chip, but after OVP disconnects, if on VBUS
High direct voltage is still present, then the high-power surge of OVP front ends also can quickly burn and cause the short circuit of VBUS and GND, this
Shi Shouji causes visitor to move back due to charging.
The content of the invention
The invention mainly solves the technical problem of, there is provided a kind of protection device, electric supply installation and terminal, solve existing skill
In art, cause VBUS short-circuit to GND there is surge or high direct voltage, cause terminal caused due to charging visitor move back ask
Topic.
To solve above-mentioned technical problem, the present invention provides a kind of protection device, including the first Overvoltage protecting unit, surge are protected
Shield unit and the second Overvoltage protecting unit, the first Overvoltage protecting unit, surge protection unit, the second Overvoltage protecting unit and treats
Protection location is connected in parallel on successively between power end VBUS and ground terminal according to the order apart from power end VBUS from the near to the remote；
First Overvoltage protecting unit, the second Overvoltage protecting unit are respectively used to be carried in the DC voltage of itself and are equal to or big
When correspondence threshold value, protection is connected in parallel between power end VBUS and ground terminal and exempts from apart from the power end VBUS units more farther than itself
Affected by DC voltage；
When surge protection unit surge occurs for being carried in the voltage or electric current of itself, protection is connected in parallel on power end VBUS
And ground terminal between and apart from power end VBUS more farther than itself unit from surge impact.
Wherein, the corresponding threshold value of the first Overvoltage protecting unit is equal with the corresponding threshold value of the second Overvoltage protecting unit, or
The corresponding threshold value of first Overvoltage protecting unit is more than the corresponding threshold value of the second Overvoltage protecting unit.
Wherein, at least one of the first Overvoltage protecting unit and the second Overvoltage protecting unit include OVP chips.
Wherein, at least one of the first Overvoltage protecting unit and the second Overvoltage protecting unit also include：Two resistance lists
Unit, one of resistance unit is in parallel with OVP chips, and the circuit after parallel connection is connected again with another resistance unit.
Wherein, the first Overvoltage protecting unit includes：First OVP chips, first resistor unit and second resistance unit, first
Resistance unit is in parallel with an OVP chips, and the circuit after parallel connection is connected again with second resistance unit；Second Overvoltage protecting unit bag
Include：2nd OVP chips, 3rd resistor unit and the 4th resistance unit, 3rd resistor unit is in parallel with the 2nd OVP chips, in parallel
Circuit afterwards is connected again with the 4th resistance unit；First OVP chips are identical with the protection voltage of the 2nd OVP chips.
Wherein, also include：5th resistance unit, the 6th resistance unit, the first capacitor cell and/or the second capacitor cell,
It is connected in parallel on successively in the following order respectively between power end VBUS and ground terminal：First capacitor cell, the 5th resistance unit, first
Overvoltage protecting unit, surge protection unit, the second Overvoltage protecting unit, the 6th resistance unit, the second capacitor cell, list to be protected
Unit.
Wherein, the capacitance sum of the first capacitor cell and the second capacitor cell is less than 6.5 microfarads.
Wherein, surge protection unit includes surge pipe.
To solve above-mentioned technical problem, the present invention provides a kind of electric supply installation, including the protection device of any of the above-described, also
Including unit to be protected, unit to be protected includes PMU.
To solve above-mentioned technical problem, the present invention provides a kind of terminal, including terminal body and above-mentioned electric supply installation.
A kind of protection device, electric supply installation and the terminal provided according to the present invention, the protection device includes that the first overvoltage is protected
Shield unit, surge protection unit and the second Overvoltage protecting unit, it is the first Overvoltage protecting unit, surge protection unit, second over-pressed
Protection location and unit to be protected according to the order apart from power end VBUS from the near to the remote be connected in parallel on successively power end VBUS and
Between ground terminal；First Overvoltage protecting unit, the second Overvoltage protecting unit be respectively used to be carried in the DC voltage of itself be equal to or
During more than correspondence threshold value, protection is connected in parallel between power end VBUS and ground terminal and apart from power end VBUS more farther than itself unit
From the impact of DC voltage；When surge protection unit surge occurs for being carried in the voltage or electric current of itself, protection is in parallel
Between power end VBUS and ground terminal and apart from power end VBUS more farther than itself unit from surge impact；Using above-mentioned
Scheme, can both solve the problems, such as the surge on VBUS circuits, can also solve the problems, such as the high direct voltage on VBUS circuits, it is to avoid existing
The problem of VBUS and GND short circuits, reduces visitor and moves back rate caused by scheme, improves Consumer's Experience.
Description of the drawings
Fig. 1 is a kind of schematic diagram of protection device that the embodiment of the present invention one is provided；
Fig. 2 is a kind of schematic diagram of electric supply installation that the embodiment of the present invention two is provided；
Fig. 3 is a kind of schematic diagram of terminal that the embodiment of the present invention three is provided.
Specific embodiment
It should be appreciated that specific embodiment described herein is only used for explaining the present invention, it is not used to limit this
It is bright.
Terminal described in the present invention may include the terminals such as smart mobile phone, notebook computer, PAD (panel computer).Below
Accompanying drawing is combined by specific embodiment to be described in further detail the present invention.
Embodiment one
The present embodiment provides a kind of protection device, and referring to Fig. 1, a kind of protection device that Fig. 1 is provided for the present embodiment is shown
It is intended to, the protection device includes：First Overvoltage protecting unit 11, the Overvoltage protecting unit 13 of surge protection unit 12 and second；The
One Overvoltage protecting unit 11, surge protection unit 12, the second Overvoltage protecting unit 13 and unit (not shown in figure 1) to be protected
It is connected in parallel on successively between power end VBUS and ground terminal according to the order apart from power end VBUS from the near to the remote；
Unit to be protected includes PMU, i.e. PMU chips.
First Overvoltage protecting unit 11, the second Overvoltage protecting unit 13 are respectively used to be carried in the DC voltage of itself and are equal to
Or during more than correspondence threshold value, protection is connected in parallel between power end VBUS and ground terminal and apart from power end VBUS more farther than itself list
Impact of the unit from DC voltage；
Exemplary, when the DC voltage for being carried in the first Overvoltage protecting unit 11 or the second Overvoltage protecting unit 13 is equal to
Or more than correspondence threshold value when, the voltage of unit is limited in the voltage range that each can bear, allow unit after
Continuous work；Or, by short circuit between power end VBUS and ground terminal, unit below quits work, and protects protected unit not
It is hit and damages.
In FIG, it is above-mentioned when the DC voltage for being carried in the first Overvoltage protecting unit 11 is equal to or more than correspondence threshold value
The unit more farther than itself apart from power end VBUS include surge protection unit 12, the second Overvoltage protecting unit 13, to be protected
Unit etc..
In FIG, it is above-mentioned when the DC voltage for being carried in the second Overvoltage protecting unit 13 is equal to or more than correspondence threshold value
The unit more farther than itself apart from power end VBUS include unit to be protected etc..
Wherein, the corresponding threshold value of the first Overvoltage protecting unit 11 is equal with the corresponding threshold value of the second Overvoltage protecting unit 13,
Or the corresponding threshold value of the first Overvoltage protecting unit 11 is more than the corresponding threshold value of the second Overvoltage protecting unit 13.
Wherein, at least one of the first Overvoltage protecting unit 11 and the second Overvoltage protecting unit 13 include OVP chips.I.e.
First Overvoltage protecting unit 11 includes OVP chips, or the second Overvoltage protecting unit 13 includes OVP chips, or first over-pressed
The Overvoltage protecting unit 13 of protection location 11 and second all includes OVP chips.
Wherein, at least one of the first Overvoltage protecting unit 11 and the second Overvoltage protecting unit 13 also include：Two electricity
Resistance unit, one of resistance unit is in parallel with OVP chips, and the circuit after parallel connection is connected again with another resistance unit.
In one embodiment, the first Overvoltage protecting unit 11 includes：First OVP chips (U1) 111, first resistor list
Unit (R1) 112 and second resistance unit (R2) 113, first resistor unit 112 is in parallel with an OVP chips 111, the electricity after parallel connection
Lu Zaiyu second resistances unit 113 is connected；
Second Overvoltage protecting unit 13 includes：2nd OVP chips (U2) 131,3rd resistor unit (R3) 132 and the 4th are electric
Resistance unit (R4) 133,3rd resistor unit 132 is in parallel with the 2nd OVP chips 131, it is in parallel after circuit again with the 4th resistance list
Unit 133 connects；
First OVP chips 111 are identical with the protection voltage of the 2nd OVP chips 131.
First resistor unit 112, second resistance unit 113 are provided with the OVP protection voltage Vovp1 of an OVP chips 111
=Vref*R2/ (R1+R2), voltage on the basis of Vref.3rd resistor unit 132, the 4th resistance unit 133 are provided with the 2nd OVP
OVP protection voltage Vovp2=Vref*R4/ (R3+R4) of chip 131；Vovp1=Vovp2 is set in this programme.
In one embodiment, also include：The resistance unit (R6) 15, first of 5th resistance unit (R5) the 14, the 6th is electric
Hold unit (C1) 16 and/or the second capacitor cell (C2) 17, unit is connected in parallel on successively in the following order respectively power end
Between VBUS and ground terminal：First capacitor cell 16, the 5th resistance unit 15, the first Overvoltage protecting unit 11, surge protection unit
(D1) the 12, second Overvoltage protecting unit 13, the 6th resistance unit 15, the second capacitor cell 17, unit to be protected.
First capacitor cell 16 and the second capacitor cell 17 are the electric capacity of voltage regulation on VBUS circuits, the He of the first capacitor cell 16
The capacitance sum of the second capacitor cell 17 is less than 6.5uF (microfarad), i.e. C1+C2<6.5uF.5th resistance unit 14 and the 6th
Resistance unit 15 is bleeder resistance, in tens K ohm scopes.
When occurring the high direct voltage more than Vovp1 or Vovp2 of unexpected ms ranks on VBUS, now OVP cores
Piece 111 can disconnect VBUS and rear end surge protection unit 12, the 2nd OVP chips 131 and to be protected within the time of hundreds of ns
The connection of unit, can protect surge protection unit 12 not damaged by prolonged high direct voltage.
When surge protection unit 12 surge occurs for being carried in the voltage or electric current of itself, protection is connected in parallel on power end
Between VBUS and ground terminal and apart from power end VBUS more farther than itself unit from surge impact.
Exemplary, when surge occur in the voltage or electric current that are carried in surge protection unit 12, by the electricity of unit
Pressure, current limit are in the voltage, current range that itself can bear；Or, powerful lightning current earial drainage is entered into ground, protect quilt
The unit of protection is not hit and damages.
In FIG, it is above-mentioned apart from power end when surge occur in the voltage or electric current that are carried in surge protection unit 12
VBUS more farther than itself unit includes the second Overvoltage protecting unit 13, unit to be protected etc..
Optionally, surge protection unit 12 includes surge pipe, and surge pipe can be high-power TVS (Transient
Voltage Suppressor, transient voltage suppressor) pipe.
When there are normal 8/20us surge voltages, an OVP chips 111 and the 2nd OVP chips 131 are conductings,
Surge protection unit 12 on relatively low voltage, protects the PMU chips of rear end surge voltage clamper.
By the enforcement of the present embodiment, the surge on VBUS circuits can be both solved the problems, such as, also can have been solved on VBUS circuits
High direct voltage problem, it is to avoid the problem of VBUS and GND short circuits caused by existing scheme, reduces visitor and moves back rate, improves user
Experience.
Embodiment two
The present embodiment provides a kind of electric supply installation, refers to Fig. 2, a kind of electric supply installation that Fig. 2 is provided for the present embodiment
Schematic diagram, the electric supply installation includes the protection device 20 in embodiment one, and also including unit to be protected 21, unit to be protected 21 is wrapped
Include the PMU chips in PMU, i.e. Fig. 2.
The protection device 20 includes：First Overvoltage protecting unit 11, the Overvoltage protecting unit of surge protection unit 12 and second
13；First Overvoltage protecting unit 11, surge protection unit 12, the second Overvoltage protecting unit 13 and unit to be protected 21 according to away from
It is connected in parallel on successively between power end VBUS and ground terminal from power end VBUS orders from the near to the remote；
First Overvoltage protecting unit 11, the second Overvoltage protecting unit 13 are respectively used to be carried in the DC voltage of itself and are equal to
Or during more than correspondence threshold value, protection is connected in parallel between power end VBUS and ground terminal and apart from power end VBUS more farther than itself list
Impact of the unit from DC voltage；
Exemplary, when the DC voltage for being carried in the first Overvoltage protecting unit 11 or the second Overvoltage protecting unit 13 is equal to
Or more than correspondence threshold value when, the voltage of unit is limited in the voltage range that each can bear, allow unit after
Continuous work；Or, by short circuit between power end VBUS and ground terminal, unit below quits work, and protects protected unit not
It is hit and damages.
In fig. 2, it is above-mentioned when the DC voltage for being carried in the first Overvoltage protecting unit 11 is equal to or more than correspondence threshold value
The unit more farther than itself apart from power end VBUS include surge protection unit 12, the second Overvoltage protecting unit 13, to be protected
Unit 21 (the PMU chips in Fig. 2) etc..
In fig. 2, it is above-mentioned when the DC voltage for being carried in the second Overvoltage protecting unit 13 is equal to or more than correspondence threshold value
The unit more farther than itself apart from power end VBUS include unit to be protected 21 etc..
Wherein, the corresponding threshold value of the first Overvoltage protecting unit 11 is equal with the corresponding threshold value of the second Overvoltage protecting unit 13,
Or the corresponding threshold value of the first Overvoltage protecting unit 11 is more than the corresponding threshold value of the second Overvoltage protecting unit 13.
Wherein, at least one of the first Overvoltage protecting unit 11 and the second Overvoltage protecting unit 13 include OVP chips.I.e.
First Overvoltage protecting unit 11 includes OVP chips, or the second Overvoltage protecting unit 13 includes OVP chips, or first over-pressed
The Overvoltage protecting unit 13 of protection location 11 and second all includes OVP chips.
Wherein, at least one of the first Overvoltage protecting unit 11 and the second Overvoltage protecting unit 13 also include：Two electricity
Resistance unit, one of resistance unit is in parallel with OVP chips, and the circuit after parallel connection is connected again with another resistance unit.
In one embodiment, the first Overvoltage protecting unit 11 includes：First OVP chips (U1) 111, first resistor list
Unit (R1) 112 and second resistance unit (R2) 113, first resistor unit 112 is in parallel with an OVP chips 111, the electricity after parallel connection
Lu Zaiyu second resistances unit 113 is connected；
Second Overvoltage protecting unit 13 includes：2nd OVP chips (U2) 131,3rd resistor unit (R3) 132 and the 4th are electric
Resistance unit (R4) 133,3rd resistor unit 132 is in parallel with the 2nd OVP chips 131, it is in parallel after circuit again with the 4th resistance list
Unit 133 connects；
First OVP chips 111 are identical with the protection voltage of the 2nd OVP chips 131.
First resistor unit 112, second resistance unit 113 are provided with the OVP protection voltage Vovp1 of an OVP chips 111
=Vref*R2/ (R1+R2), voltage on the basis of Vref.3rd resistor unit 132, the 4th resistance unit 133 are provided with the 2nd OVP
OVP protection voltage Vovp2=Vref*R4/ (R3+R4) of chip 131；Vovp1=Vovp2 is set in this programme.
In one embodiment, also include：The resistance unit (R6) 15, first of 5th resistance unit (R5) the 14, the 6th is electric
Hold unit (C1) 16 and/or the second capacitor cell (C2) 17, unit is connected in parallel on successively in the following order respectively power end
Between VBUS and ground terminal：First capacitor cell 16, the 5th resistance unit 15, the first Overvoltage protecting unit 11, surge protection unit
(D1) the 12, second Overvoltage protecting unit 13, the 6th resistance unit 15, the second capacitor cell 17, unit to be protected 21.
First capacitor cell 16 and the second capacitor cell 17 are the electric capacity of voltage regulation on VBUS circuits, the He of the first capacitor cell 16
The capacitance sum of the second capacitor cell 17 is less than 6.5uF (microfarad), i.e. C1+C2<6.5uF.5th resistance unit 14 and the 6th
Resistance unit 15 is bleeder resistance, in tens K ohm scopes.
When occurring the high direct voltage more than Vovp1 or Vovp2 of unexpected ms ranks on VBUS, now OVP cores
Piece 111 can disconnect VBUS and rear end surge protection unit 12, the 2nd OVP chips 131 and to be protected within the time of hundreds of ns
The connection of unit 21, can protect surge protection unit 12 not damaged by prolonged high direct voltage.
When surge protection unit 12 surge occurs for being carried in the voltage or electric current of itself, protection is connected in parallel on power end
Between VBUS and ground terminal and apart from power end VBUS more farther than itself unit from surge impact.
Exemplary, when surge occur in the voltage or electric current that are carried in surge protection unit 12, by the electricity of unit
Pressure, current limit are in the voltage, current range that itself can bear；Or, powerful lightning current earial drainage is entered into ground, protect quilt
The unit of protection is not hit and damages.
In fig. 2, it is above-mentioned apart from power end when surge occur in the voltage or electric current that are carried in surge protection unit 12
VBUS more farther than itself unit includes the second Overvoltage protecting unit 13, unit to be protected 21 etc..
Optionally, surge protection unit 12 includes surge pipe, and surge pipe can be high-power TVS pipe.
When there are normal 8/20us surge voltages, an OVP chips 111 and the 2nd OVP chips 131 are conductings,
Surge protection unit 12 on relatively low voltage, protects the PMU chips of rear end surge voltage clamper.
By the enforcement of the present embodiment, the surge on VBUS circuits can be both solved the problems, such as, also can have been solved on VBUS circuits
High direct voltage problem, it is to avoid the problem of VBUS and GND short circuits caused by existing scheme, reduces visitor and moves back rate, improves user
Experience.
Embodiment three
The present embodiment provides a kind of terminal, referring to Fig. 3, a kind of schematic diagram of terminal that Fig. 3 is provided for the present embodiment, and the end
End includes terminal body 31 and the electric supply installation 32 in embodiment two.
The electric supply installation 32 includes the protection device 20 in embodiment one, also including unit to be protected 21, unit to be protected
21 include the PMU chips in PMU, i.e. Fig. 2.
The protection device 20 includes：First Overvoltage protecting unit 11, the Overvoltage protecting unit of surge protection unit 12 and second
13；First Overvoltage protecting unit 11, surge protection unit 12, the second Overvoltage protecting unit 13 and unit to be protected 21 according to away from
It is connected in parallel on successively between power end VBUS and ground terminal from power end VBUS orders from the near to the remote；
First Overvoltage protecting unit 11, the second Overvoltage protecting unit 13 are respectively used to be carried in the DC voltage of itself and are equal to
Or during more than correspondence threshold value, protection is connected in parallel between power end VBUS and ground terminal and apart from power end VBUS more farther than itself list
Impact of the unit from DC voltage；
Exemplary, when the DC voltage for being carried in the first Overvoltage protecting unit 11 or the second Overvoltage protecting unit 13 is equal to
Or more than correspondence threshold value when, the voltage of unit is limited in the voltage range that each can bear, allow unit after
Continuous work；Or, by short circuit between power end VBUS and ground terminal, unit below quits work, and protects protected unit not
It is hit and damages.
In fig. 2, it is above-mentioned when the DC voltage for being carried in the first Overvoltage protecting unit 11 is equal to or more than correspondence threshold value
The unit more farther than itself apart from power end VBUS include surge protection unit 12, the second Overvoltage protecting unit 13, to be protected
Unit 21 (the PMU chips in Fig. 2) etc..
In fig. 2, it is above-mentioned when the DC voltage for being carried in the second Overvoltage protecting unit 13 is equal to or more than correspondence threshold value
The unit more farther than itself apart from power end VBUS include unit to be protected 21 etc..
Wherein, the corresponding threshold value of the first Overvoltage protecting unit 11 is equal with the corresponding threshold value of the second Overvoltage protecting unit 13,
Or the corresponding threshold value of the first Overvoltage protecting unit 11 is more than the corresponding threshold value of the second Overvoltage protecting unit 13.
Wherein, at least one of the first Overvoltage protecting unit 11 and the second Overvoltage protecting unit 13 include OVP chips.I.e.
First Overvoltage protecting unit 11 includes OVP chips, or the second Overvoltage protecting unit 13 includes OVP chips, or first over-pressed
The Overvoltage protecting unit 13 of protection location 11 and second all includes OVP chips.
Wherein, at least one of the first Overvoltage protecting unit 11 and the second Overvoltage protecting unit 13 also include：Two electricity
Resistance unit, one of resistance unit is in parallel with OVP chips, and the circuit after parallel connection is connected again with another resistance unit.
In one embodiment, the first Overvoltage protecting unit 11 includes：First OVP chips (U1) 111, first resistor list
Unit (R1) 112 and second resistance unit (R2) 113, first resistor unit 112 is in parallel with an OVP chips 111, the electricity after parallel connection
Lu Zaiyu second resistances unit 113 is connected；
Second Overvoltage protecting unit 13 includes：2nd OVP chips (U2) 131,3rd resistor unit (R3) 132 and the 4th are electric
Resistance unit (R4) 133,3rd resistor unit 132 is in parallel with the 2nd OVP chips 131, it is in parallel after circuit again with the 4th resistance list
Unit 133 connects；
First OVP chips 111 are identical with the protection voltage of the 2nd OVP chips 131.
First resistor unit 112, second resistance unit 113 are provided with the OVP protection voltage Vovp1 of an OVP chips 111
=Vref*R2/ (R1+R2), voltage on the basis of Vref.3rd resistor unit 132, the 4th resistance unit 133 are provided with the 2nd OVP
OVP protection voltage Vovp2=Vref*R4/ (R3+R4) of chip 131；Vovp1=Vovp2 is set in this programme.
In one embodiment, also include：The resistance unit (R6) 15, first of 5th resistance unit (R5) the 14, the 6th is electric
Hold unit (C1) 16 and/or the second capacitor cell (C2) 17, unit is connected in parallel on successively in the following order respectively power end
Between VBUS and ground terminal：First capacitor cell 16, the 5th resistance unit 15, the first Overvoltage protecting unit 11, surge protection unit
(D1) the 12, second Overvoltage protecting unit 13, the 6th resistance unit 15, the second capacitor cell 17, unit to be protected 21.
First capacitor cell 16 and the second capacitor cell 17 are the electric capacity of voltage regulation on VBUS circuits, the He of the first capacitor cell 16
The capacitance sum of the second capacitor cell 17 is less than 6.5uF (microfarad), i.e. C1+C2<6.5uF.5th resistance unit 14 and the 6th
Resistance unit 15 is bleeder resistance, in tens K ohm scopes.
When occurring the high direct voltage more than Vovp1 or Vovp2 of unexpected ms ranks on VBUS, now OVP cores
Piece 111 can disconnect VBUS and rear end surge protection unit 12, the 2nd OVP chips 131 and to be protected within the time of hundreds of ns
The connection of unit 21, can protect surge protection unit 12 not damaged by prolonged high direct voltage.
When surge protection unit 12 surge occurs for being carried in the voltage or electric current of itself, protection is connected in parallel on power end
Between VBUS and ground terminal and apart from power end VBUS more farther than itself unit from surge impact.
Exemplary, when surge occur in the voltage or electric current that are carried in surge protection unit 12, by the electricity of unit
Pressure, current limit are in the voltage, current range that itself can bear；Or, powerful lightning current earial drainage is entered into ground, protect quilt
The unit of protection is not hit and damages.
In fig. 2, it is above-mentioned apart from power end when surge occur in the voltage or electric current that are carried in surge protection unit 12
VBUS more farther than itself unit includes the second Overvoltage protecting unit 13, unit to be protected 21 etc..
Optionally, surge protection unit 12 includes surge pipe, and surge pipe can be high-power TVS pipe.
When there are normal 8/20us surge voltages, an OVP chips 111 and the 2nd OVP chips 131 are conductings,
Surge protection unit 12 on relatively low voltage, protects the PMU chips of rear end surge voltage clamper.
By the enforcement of the present embodiment, the surge on VBUS circuits can be both solved the problems, such as, also can have been solved on VBUS circuits
High direct voltage problem, it is to avoid the problem of VBUS and GND short circuits caused by existing scheme, reduces visitor and moves back rate, improves user
Experience.
Obviously, those skilled in the art should be understood that each module or each step of the embodiments of the present invention can be used
Realizing, they can be concentrated on single computing device general computing device, or be distributed in multiple computing device institutes
On the network of composition, alternatively, they can be realized with the executable program code of computing device, it is thus possible to by they
It is stored in storage medium (ROM/RAM, magnetic disc, CD) and is performed by computing device, and in some cases, can be with not
The order being same as herein performs shown or described step, or they are fabricated to respectively each integrated circuit modules, or
Multiple modules or step in them are fabricated to single integrated circuit module to realize by person.So, the present invention is not restricted to appoint
What specific hardware and software is combined.
Above content is to combine the further description that specific embodiment is made to the embodiment of the present invention, it is impossible to recognized
Being embodied as of the fixed present invention is confined to these explanations.For general technical staff of the technical field of the invention,
Without departing from the inventive concept of the premise, some simple deduction or replace can also be made, the present invention should be all considered as belonging to
Protection domain.
Claims (10)
1. a kind of protection device, it is characterised in that including the first Overvoltage protecting unit, surge protection unit and the second overvoltage protection
Unit, first Overvoltage protecting unit, surge protection unit, the second Overvoltage protecting unit and unit to be protected are according to distance
Power end VBUS orders from the near to the remote are connected in parallel on successively between the power end VBUS and ground terminal；
First Overvoltage protecting unit, the second Overvoltage protecting unit are respectively used to be carried in the DC voltage of itself and are equal to or big
When correspondence threshold value, protection is connected in parallel between the power end VBUS and the ground terminal and apart from the power end VBUS than itself
Impact of the farther unit from the DC voltage；
When the surge protection unit surge occurs for being carried in the voltage or electric current of itself, protection is connected in parallel on the power end
Between VBUS and the ground terminal and apart from the power end VBUS more farther than itself unit from surge impact.
2. protection device as claimed in claim 1, it is characterised in that the corresponding threshold value of first Overvoltage protecting unit and institute
State the corresponding threshold value of the second Overvoltage protecting unit equal, or the corresponding threshold value of first Overvoltage protecting unit is more than described the
The corresponding threshold value of two Overvoltage protecting units.
3. protection device as claimed in claim 1, it is characterised in that first Overvoltage protecting unit and described second over-pressed
At least one of protection location includes OVP chips.
4. protection device as claimed in claim 3, it is characterised in that first Overvoltage protecting unit and described second over-pressed
In protection location it is described at least one also include：Two resistance units, one of resistance unit is with the OVP chips simultaneously
Connection, the circuit after parallel connection is connected again with another resistance unit.
5. protection device as claimed in claim 4, it is characterised in that first Overvoltage protecting unit includes：First OVP cores
Piece, first resistor unit and second resistance unit, the first resistor unit is in parallel with an OVP chips, after parallel connection
Circuit is connected again with the second resistance unit；Second Overvoltage protecting unit includes：2nd OVP chips, 3rd resistor list
Unit and the 4th resistance unit, the 3rd resistor unit is in parallel with the 2nd OVP chips, it is in parallel after circuit again with described the
Four resistance units are connected；The first OVP chips are identical with the protection voltage of the 2nd OVP chips.
6. protection device as claimed in claim 1, it is characterised in that also include：5th resistance unit, the 6th resistance unit,
First capacitor cell and/or the second capacitor cell, are connected in parallel on successively in the following order respectively the power end VBUS and ground terminal
Between：First capacitor cell, the 5th resistance unit, first Overvoltage protecting unit, the surge protection unit,
Second Overvoltage protecting unit, the 6th resistance unit, second capacitor cell, the unit to be protected.
7. protection device as claimed in claim 6, it is characterised in that the electricity of first capacitor cell and the second capacitor cell
Capacitance sum is less than 6.5 microfarads.
8. the protection device as described in any one of claim 1 to 7, it is characterised in that the surge protection unit includes surge
Pipe.
9. a kind of electric supply installation, it is characterised in that include the protection device as described in any one of claim 1 to 8, also including treating
Protection location, the unit to be protected includes PMU.
10. a kind of terminal, including terminal body and electric supply installation as claimed in claim 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611170222.3A CN106602534A (en) | 2016-12-16 | 2016-12-16 | Protection device, power supply device and terminal |
| PCT/CN2017/072571 WO2018107568A1 (en) | 2016-12-16 | 2017-01-25 | Protection device, power supply device and terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611170222.3A CN106602534A (en) | 2016-12-16 | 2016-12-16 | Protection device, power supply device and terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106602534A true CN106602534A (en) | 2017-04-26 |
Family
ID=58601005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611170222.3A Pending CN106602534A (en) | 2016-12-16 | 2016-12-16 | Protection device, power supply device and terminal |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106602534A (en) |
| WO (1) | WO2018107568A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317319A (en) * | 2017-07-31 | 2017-11-03 | 北京小米移动软件有限公司 | Surge protection device and method and a kind of mobile terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847859A (en) * | 2009-03-25 | 2010-09-29 | 深圳富泰宏精密工业有限公司 | Interface apparatus and electronic device using same |
| US20110216460A1 (en) * | 2010-03-02 | 2011-09-08 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd . | Over-voltage protection system and electronic device using the same |
| CN105068636A (en) * | 2015-08-25 | 2015-11-18 | 山东超越数控电子有限公司 | Anti-shock surge circuit applied to ruggedized computer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100467609B1 (en) * | 2002-09-03 | 2005-01-24 | 삼성전자주식회사 | Apparatus and method for protecting secondarily over voltage |
| CN200959512Y (en) * | 2006-09-15 | 2007-10-10 | 唐辉 | Overvoltage and lightning resisting circuit and device for TV-set, telephone and computer |
| CN201584766U (en) * | 2009-12-11 | 2010-09-15 | 谢树奎 | Protector for ADSL modem |
| CN202524073U (en) * | 2012-02-29 | 2012-11-07 | 深圳市思乐数据技术有限公司 | Overvoltage protection circuit and communication equipment |
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2016
- 2016-12-16 CN CN201611170222.3A patent/CN106602534A/en active Pending
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2017
- 2017-01-25 WO PCT/CN2017/072571 patent/WO2018107568A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847859A (en) * | 2009-03-25 | 2010-09-29 | 深圳富泰宏精密工业有限公司 | Interface apparatus and electronic device using same |
| US20110216460A1 (en) * | 2010-03-02 | 2011-09-08 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd . | Over-voltage protection system and electronic device using the same |
| CN105068636A (en) * | 2015-08-25 | 2015-11-18 | 山东超越数控电子有限公司 | Anti-shock surge circuit applied to ruggedized computer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317319A (en) * | 2017-07-31 | 2017-11-03 | 北京小米移动软件有限公司 | Surge protection device and method and a kind of mobile terminal |
| CN107317319B (en) * | 2017-07-31 | 2019-11-08 | 北京小米移动软件有限公司 | Surge protection device and method and a kind of mobile terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018107568A1 (en) | 2018-06-21 |
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Application publication date: 20170426 |
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