CN104335437B - Electronic equipment electric power protection circuit - Google Patents
Electronic equipment electric power protection circuit Download PDFInfo
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- CN104335437B CN104335437B CN201380027991.6A CN201380027991A CN104335437B CN 104335437 B CN104335437 B CN 104335437B CN 201380027991 A CN201380027991 A CN 201380027991A CN 104335437 B CN104335437 B CN 104335437B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/14—Indicating direction of current; Indicating polarity of voltage
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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
- H02H3/18—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 reversal of direct current
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
- G05F3/02—Regulating voltage or current
- G05F3/08—Regulating voltage or current wherein the variable is dc
- G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
- G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
- G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
- G05F3/26—Current mirrors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Nonlinear Science (AREA)
- Electromagnetism (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
- Dc-Dc Converters (AREA)
- Protection Of Static Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention discloses a kind of host electronic appliance, and the host electronic appliance may be coupled to accessory electronic device.In the normal operation period, host device can by power circuit to accessory device supply electric power.By inserting protection transistor in power circuit wherein accessory device can be prevented to transmit the inverse power supply event of electric power to host device.Protection transistor and another transistor formation current mirror can be used, the current mirror produces the sensing electric current proportional to flowing through the magnitude of current of power circuit.Current Voltage amplifier can produce and sense the sensing voltage of current in proportion.Biasing circuit can be used for making the sensing current offset by current mirror.Sensing voltage can be compared by control circuit with one or more reference voltages, and the shut-off protection transistor in the inverse power supply suitable for preventing host device.
Description
Background technology
Present invention relates generally to electronic equipment, and more particularly, to the electric power protection circuit for electronic equipment.
Electronic equipment (such as cell phone, media player, tablet personal computer and miscellaneous equipment) is often coupled to annex.Example
Such as, accessory device can have display, loudspeaker or host electronic appliance when playing media file or other contents for user
Workable other components.
In the normal operation period, host device can supply electric power to annex.If annex is defective or designs improper, then
Annex may supply electric power to host device rather than draw electric power from host device.This row for being referred to alternatively as inverse power supply sometimes
For that may cause to damage to host device.
Therefore, it would be desirable to can provide for being prevented when annex is coupled to electronic equipment because being damaged caused by inverse power supply
Protection circuit.
The content of the invention
Annex may potentially carry out inverse power supply to host electronic appliance.In order to prevent from causing host electronic appliance damaging
Bad, electronic equipment can have protection circuit.Whenever inverse power supply situation is detected, protection circuit can be used for blocking annex and main frame
Electric current flowing between equipment.
Host electronic appliance can be coupled to accessory electronic device by power source path.In the normal operation period, host device
Can by power circuit to accessory device supply electric power.In some cases, annex may attempt to transmit electric power to host device.
Such inverse powered operation is undesirable, and can be prevented by inserting protection transistor in power circuit.Can
Current mirror is formed using protection transistor and another transistor.Biasing circuit can be used to keep the leakage of another transistor
Pole and the drain electrode of protection transistor lie substantially in identical voltage, so as to improve the degree of accuracy of current mirror.For example, biasing circuit
It may include to arrange the mirror transistor to be formed with cascade.Biasing circuit can be used and flows through the electricity of another transistor to bias
Flow to match predetermined bias current.By the way that the current offset of another transistor will be flowed through into predetermined biasing
Electric current and arranged using cascade, the change associated with temperature can be mitigated.
Current mirror can produce the sensing electric current proportional to the magnitude of current for currently flowing through protection transistor and power circuit.Electricity
Stream-voltage amplifier can produce and sense the sensing voltage of current in proportion.If desired, biasing circuit can be configured such that
Current-voltage amplifier is produced with sensing the electric current sensing voltage that to subtract predetermined bias current proportional.Control circuit
Comparator can be used to be compared voltage is sensed with reference voltage.
When sensing voltage, which is in, indicates that electric power is flowing to the level of annex from host device, control circuit can be connected
Transistor is protected to allow main frame as accessories.As long as the reverse current occurred on power circuit is no more than acceptable small
Amount, can also connect protection transistor.When detecting inverse power supply situation, circuit breakable transistor is controlled to prevent electric current from passing through
Power circuit is from annex is flowed into host device.
Control circuit can be used first comparator to detect serious inverse power supply situation.The second comparator can be used in control circuit
The duration long inverse power supply situation of appropriateness is detected with detection circuit.In response to detecting serious inverse power supply situation or continuing
The inverse power supply situation of appropriateness of overlong time, control circuit can turn off protection transistor.
Absorbing crystal pipe may be coupled to power circuit to be transferred out the power circuit of inverse supply current slave unit.Absorb
Transistor can be controlled by control circuit based on sensing voltage, to absorb the reverse current of appropriate amount.
With reference to the accompanying drawings and following detailed description of the preferred embodiment, further feature of the invention, the essence of the present invention
And various advantages will become apparent.
Brief description of the drawings
Fig. 1 is a kind of system that wherein host electronic appliance according to an embodiment of the invention is coupled to accessory electronic device
Diagram.
Fig. 2 is to show to measure in the electronic device according to one embodiment of the invention to detect the signal of inverse power supply situation
Figure.
Fig. 3 is the circuit diagram of exemplary protection circuit according to an embodiment of the invention.
Fig. 4 is the circuit diagram of the exemplary protection circuit according to an embodiment of the invention arranged with cascade mirror.
Fig. 5 is to show how the voltage being sensed can depend on the diagram of the output current of Fig. 4 circuit.
Fig. 6 be according to one embodiment of the invention show Fig. 4 circuit how can to help to mitigate the voltage that is sensed with
The diagram of the associated change of temperature.
Fig. 7 be according to one embodiment of the invention illustrate how by Fig. 4 the regulation of electrical circuit into different offset controls diagram.
Fig. 8 is the exemplary control circuit of the inverse power supply situation of detectable serious and appropriateness according to an embodiment of the invention
Diagram.
Fig. 9 be according to one embodiment of the invention show Fig. 8 control circuit how can to respond serious inverse power supply situation when
Sequence figure.
Figure 10 be according to one embodiment of the invention show Fig. 8 control circuit how can to respond the inverse power supply situation of appropriateness when
Sequence figure.
Figure 11 is the diagram of the exemplary protection circuit according to an embodiment of the invention with absorbing crystal pipe.
Embodiment
Show to include a kind of illustrative system of the electronic equipment with protection circuit in Fig. 1.As shown in fig. 1, system 8
It may include host device (such as electronic equipment 10) and accessory device (such as electronic equipment 14 or other external equipments).Road
Footpath 12 can be used for coupling access equipment 10 and 14.Path 12 may include power line, the He of positive power line 16 that such as positive electricity ource electric current flows through
The ground connection power line 17 that earthing power supply electric current flows through.Path 12 may also include analog signal line and/or digital signal line (for example,
Paired data wire etc.).When electric power is sent to annex 14 from main frame 10, the electric current I for flowing through circuit 16 will be for just.
Equipment 10 can have the input-output port with input-output power supply terminal T1 and T2.Equipment 14 can have band
There is input-output power supply terminal T3 and T4 input-output port.Terminal T1 and T3 can be positive power terminals.Terminal T2 and
T4 can be ground power terminals.When equipment 10 and equipment 14 are coupled together, terminal T1 can be electrically connected to via circuit 16
Terminal T3, terminal T2 can be connected to terminal T4 via circuit 17.Conductive path 16 and 17 can form a part for cable, or can lead to
The direct contact between terminal T1 and T2 and between terminal T3 and T4 is crossed to be formed.Terminal T1 and T2 can be with the connections in equipment 10
Contact in device (for example, input-output connector in input-output port in equipment 10) is associated.Terminal T3 and T4
Can be with the contact phase in the connector in equipment 14 (for example, input-output connector in input-output port in equipment 14)
Association.
Electronic equipment (such as Fig. 1 equipment 10 and 14) can be：Cell phone；Media player；Other hand-portables
Formula equipment；Somewhat smaller portable set, such as watch equipment, hanging equipment or other wearable or micromodule equipment；Game
Equipment；Tablet personal computer；Notebook computer；Desktop computer；Television set；Computer monitor；It is incorporated into computer monitor
Computer；Equipment in embedded device, such as automobile；Including for presented to user sound and/or video loudspeaker and/
Or the equipment of monitor；Or other electronic equipments.For example, host electronic appliance 10 can be cell phone, media player or
Computer, accessory electronic device 14 can include being used for the loudspeaker of audio being presented and/or for presenting to user to user
The equipment of the display of video.To equipment 14 it can provide to be displayed by the data path slave unit 10 associated with path 12
Audio and/or video content.
Main frame 10 may include storage and process circuit 30 and input-output circuit 28.Electronic equipment 14 may include storage
With process circuit 48 and input-output circuit 50.Storage and process circuit 30 and 48 may include one or more integrated circuits,
Such as memory circuitry, processor and application specific integrated circuit.Input-output circuit 28 and input-output circuit 50 may include to use
Family interface module, such as button, loudspeaker, microphone, display, touch sensor and for collecting input or to user
The miscellaneous equipment of output is presented.Input-output circuit 28 may also include wire communication circuit, radio communication circuit, sensor and
Other electronic equipment assemblies.
The AC line powers from wall socket or other alternating currents (AC) electric power source (for example, AC sources 20 and 52) can be used
To supply electric power for equipment 10 and 14.Battery (such as battery 22 and 46) can also be used to obtain electric power.
Power regulator circuitry 18 and 44 can be used for being converted into AC electric power or battery electric power from AC sources to supply equipment 10
With direct current (DC) electric power source after 14 regulation that uses of electric component (for example, zero on positive voltage and-terminal on+terminal
Voltage or ground voltage).
In the normal operation period, the power regulator circuitry 18 of equipment 10 can provide positive voltage to node 38.Protection
(that is, the switch formed by transistor can be closure) that transistor SW (being used as protection switch) can be generally to turn on, makes
Voltage on node 38 must be transported to node 36.Positive voltage node 36 in equipment 10 can be connected to by positive signal line 16
Positive voltage node 54 in equipment 14.Power ground line 17 can be used for the ground connection 56 in equipment 14 being connected in equipment 10
Ground connection 58.
When transistor SW in the normal operation period is connected, host device 10 to annex 14 can supply electricity via path 12
Power.Therefore, positive current I can flow along circuit 16.In the annex without electric power source, in the absence of the risk of inverse power supply situation.
If however, equipment 14 breaks down or designed improper, then power regulator circuitry 44 may attempt to via path 12 to setting
Standby 10 transmission electric power.In this type of situation, negative value electric current I may be generated on circuit 16.
In order to prevent from causing equipment 10 damaging, equipment 10 can turn off transistor SW once detecting inverse power supply situation
(that is, switch SW can be disconnected).For example, (that is, being higher than when I value is less than -5mA or other suitable threshold values in electric current I value
During given threshold value and when electric current I polarity is bears), breakable transistor SW is opened with being formed between drain D 1 and source S 1
Road.
The state for controlling circuit 24 to can be used for controlling transistor SW in the following manner：Via control line 42 to transistor SW
Grid G 1 apply control signal, such as control voltage Vcnt.When controlling circuit 24 to assert (assert) control signal Vcnt,
Transistor SW can be connected to allow electric power to flow to path 12 from power regulator circuitry 18.When control circuit 24 is deasserted
(deassert) when controlling Vcnt, breakable transistor SW is to block current flow from apparatus 14 to flow into equipment 10, so that in inverse power supply
Protection equipment 10 is from damaging during event.
Current sensing circuit can be used, such as with biasing circuit and current-voltage amplifier circuit in control circuit 24
Current mirroring circuit (that is, circuit 26) flows through the transistor SW magnitude of current to monitor.Circuit 26 can be coupled to terminal using path 32
36, and terminal 38 can be coupled to via path 34.Circuit 26 can be coupled to transistor SW grid via path 66.In operation
Period, the component of circuit 26 can be with transistor SW formation current mirrors.The current mirror and associated circuits of circuit 26 can be conducive to prison
Survey electric current I.
When electric current I flows through transistor SW, proportional voltage drop V is formed between terminal 36 and 38Drop.Because transistor
What SW was to turn on, so VDropValue may be comparatively small so that based on VDropThe measurement carried out to I is challenging and dives
On ground easily by the influence of noise on circuit 16.Therefore, equipment 10 preferably includes the electricity using transistor SW and the formation of circuit 26
Flow mirror.The current mirroring circuit of equipment 10 and associated current-voltage amplifier circuit can be used for the electric current I that will be sensedSensing
It is converted into and voltage VSensing, the electric current I being sensedSensingIt is the low current proportional to electric current I, voltage VSensingWith electric current I into than
Example.Control circuit 24 can be via path 40 from the reception voltage signal V of circuit 26Sensing。
As shown in the curve 60 as Fig. 2, VDropPossible current margin (for example, in the example of figure 2 be from-
200mA to 500mA) on value may be comparatively small, and may not be significantly changed with electric current I.Such as by Fig. 2 lines
Shown in 62, VSensingValue can significantly bigger (for example, big such as 10 times to 100 times).Voltage VSensingCan also significantly it change with electric current I
Become.Because VSensingMore than VDrop, and more specifically, because VSensingChange (that is, the lines 62 for given electric current I changes
Gradient) it is noticeably greater than VDropThe change (that is, the gradients of lines 62) for identical given electric current I changes, so control
Circuit 24 uses V when carrying out the judgement on transistor SW stateSensingThe degree of accuracy can be improved.
Fig. 3 is the circuit diagram for showing to can be used for realizing the exemplary components of circuit 26 and circuit 24.As shown in Figure 3, it is electric
Road 26 may include to be configured as the transistor with transistor SW formation current mirrors, such as transistor M2.Circuit 26 may also include partially
Circuits and current-voltage amplifier circuit 68.Biasing and current-voltage amplifier circuit 68 may include to be configured as driving sense
Survey electric current ISensingBy resistor R with the generation voltage V on circuit 40SensingTransistor, such as transistor M1 and M6.
Transistor SW can have source terminal S1, drain terminal D1 and gate terminal G1.Transistor M2 can have source terminal
Sub- S2, drain terminal D2 and gate terminal G2.For the best accuracy of the current mirror of transistor SW and M2 formation, it is desirable to crystal
Pipe SW source S 1 has identical voltage and transistor SW grid G 1 and transistor M2 grid with transistor M2 source S 2
Pole G2 has identical voltage.This can be electrically connected source S 1 and source S 2 by using circuit 32 and use the electric connection grid of circuit 66
Pole G1 and grid G 2 are realized.
Also drain D 1 and D2 should be maintained in identical voltage to ensure the exact operations of current mirror.Transistor SW and M2
Drain D 1 and D2 be not shorted together.However, the biasing circuit of circuit 68 can be used for making node 72 (and therefore drain D 2)
The voltage at place and the voltage matches at drain D 1.Voltage level in drain D 2 is forced by using circuit 68 close to drain D 1
On voltage level, the current mirror formed by transistor SW and M2 can produce sensing electric current I on circuit 32Sensing, the sensing electric current
ISensingThe value of the electric current I on circuit 14 is followed exactly.In a typical arrangement, transistor M2 and SW can be configured such that
ISensingBe I small fraction (for example so that ISensing10 will be equal to-6* I or I other suitable fractions).Therefore, passage path 32 is drawn
The electric current I takenSensingValue be negligible and can be ignored so that the electric current (I) for flowing through circuit 14 will be substantially first-class
In the value for the electric current for flowing through transistor SW.
Transistor M1 and M6, which can be formed, to be used for electric current ISensingIt is converted into the voltage V on circuit 40SensingCommon grid amplifier.
As shown in Figure 3, transistor M6 is connected diode (that is, drain D 6 and grid G 6 is connected by path 76).Current source 78
Produce the bias current I of D/C voltage in setting drain D 6 (node 74)Biasing.Node 74 is less than one of the voltage at node 38
(that is, transistor M6 is in electric current I by VgsBiasingUnder a grid to source voltage).Voltage on node 74 is provided to transistor
M1 grid G and the operating point for setting transistor M1.Because the voltage at node 72 is above one of the voltage of node 74
Vgs (M1's) the and because voltage on node 74 is less than a Vgs (M6's) of the voltage on node 38, transistor
M1 source terminal S (that is, node 72 and transistor M2 drain D 2) voltage generally follows (that is, the transistor of node 38
SW drain D 1) place voltage.Due to the operation of this bias current, the voltage in drain D 2 substantially matches the electricity in drain D 1
Pressure, thereby helps to ensure that accurate current mirror operation.
Because the electric current I in M2 and SW formation current mirrors, transistor M2SensingWith transistor SW current in proportion.Electricity
Flow ISensingFlow through sense resistor R and voltage drop V is produced on circuit 40Sensing.Control circuit 24 can have comparator, such as than
Compared with device 80.Comparator 80 can be by the voltage V on input 82SensingIt is compared with the reference voltage Vref on input 84, and
Reflection V can be produced on circuit 86SensingIt is above or below Vref corresponding binary output signal.Using on circuit 86
The control signal Vcnt on circuit 42 can be asserted or deasserted to the state of signal, control circuit 24.
The value of reference voltage Vref can be set to correspond to the value of the desired reverse current threshold value in path 14.For example,
Vref can be set to correspond to the level of -5mA electric current I values.Under the I values higher than -5mA and less than 0, equipment 10 is flowed to
In the magnitude of current it is minimum so that equipment 10 can satisfactorily absorb reverse current I without to its intraware cause damage.
Under the I values higher than 0, in the absence of inverse power supply situation and equipment 10 and the normal work of annex 14.In both cases, control
Circuit 24 can assert Vcnt signals on circuit 42, be to turn on to ensure transistor SW.In the case where transistor SW is connected,
Node 38 and 36 will be shorted together, and equipment 10 and equipment 14 can be the mould that equipment 14 is powered with the passage path 12 of equipment 10
Formula is operated.
In order to help to ensure accurate performance, adjustable reference voltage Vref.For example, Vref value can be set as with
Lower value, the value remove comparator internal blas and ensure control circuit will desired electric current I values (for example, -5mA or
Other suitable levels) it is triggered.
Toggled when output on circuit 86 is by the threshold current value (in this example) for being less than -5mA in I values (anti-
Turn).Control circuit 24 will be responded accordingly by deasserting control signal Vcnt with turning off transistor SW.In shut-off
In the case of transistor SW, the inverse supply current that slave unit 14 flows to equipment 12 will be blocked, so as to prevent the electricity to equipment 10
Cause to damage in road.
It can be improved by using the transistor matched each other by the standard of transistor M1 and the M6 common grid amplifier formed
Exactness.Transistor M2 and SW can have ratio (K values) to be about 10-2To 10-4Or the intensity (W/L values) of other suitable ratios.Example
Such as, transistor M2 can have the intensity of transistor SW about one thousandth intensity.
It is used to help detect that the biasing circuit of inverse power supply situation can have for improving the cascode amplifier of circuit bias.
Fig. 4 is to show how biasing circuit and electric current can form an exemplary circuit diagram of cascade arrangement to potential circuit 68.Such as
Shown in Fig. 4, bias current IBiasingCircuit branch 102 and 104 can be mirrored to by transistor M8, M9 and M12 (for example, crystal
Pipe M8 and M9 can form the current mirror for circuit branch 102, and transistor M8 and M12 can be formed for circuit branch 104
Current mirror).
Transistor M11 and M13 can be used as cascode transistors, its help to make current mirror transistor M9 and M12 with and
The associated change isolation of different drain voltages.For example, transistor M11 can help to make transistor M9 and transistor M8 leakage
Pole-source voltage matching, this operation for often making transistor M9 and electric current ISensingChange isolation (for example, because make transistor M9
Dram-source voltage and grid-source voltage matched with transistor M8 dram-source voltage and grid-source voltage).
Transistor M3, M5, M4 and M7 can be used as cascade arrangement, and it helps to make the voltage and crystal at transistor M2 drain D 2
Voltage matches at pipe SW drain D 1.
By transistor M2 from the electric current I of transistor SW mirror imagesSensingIt may be provided to transistor M1 and M3.Electric current ISensingIt can be drawn
It is divided into electric current Is2 and Is1.Electric current Is2 can be determined by the magnitude of current from current mirror transistor M12 (for example, electric current Is2 can be waited
In IBiasingPlus electric current I1).Electric current Is1 can reflect from ISensingAny residual current.For example, for more than electric current Is2 (for example,
More than IBiasing) ISensingFor electric current, electric current Is1 can reflect ISensingCurrent differential between Is2.And for example, for not enough (example
Such as, less than IBiasing) electric current ISensingFor, indivisible electric current can flow through resistor R.Electric current Is1 can be routed through circuit point
Prop up 106 and sensed by resistor R amplifications with producing voltage V.
Fig. 5 is shown by the voltage V of Fig. 4 circuit generationSensingHow (to be set with output current I for example, being provided to annex
Standby output current) change an exemplary diagram.As shown in Figure 5, under output current Ia, VSensingIt can be zero volt.Ia
The difference that can reflect between the bias current I1 of circuit branch 102 and the Is2 of circuit branch 104 of value.If for example, transistor
M9 and M12 are matched to so that I1 is equal to Is2, then Ia can be minimum (for example, Ia can be between -2mA and 0mA
Value, such as -1.5mA).In other words, as electric current ISensingWhen equal to electric current Is2 and passing through resistor R without electric current, VSensingCan
To be zero volt.When equipment output current is more than Ia, voltage VSensingIt is positively retained at zero volt.
Control circuit 24 can be configured to respond to determine voltage VSensingMore than threshold voltage Vb (for example, when inverse supply current
Value when exceeding electric current Ib value) and disable transistor SW.Threshold voltage Vb can be subjected to based on power regulator circuitry 18
Value is up to the ability of the inverse supply current of Ib values to select.
Fig. 4 biasing circuit 68 helps to ensure at the drain D 2 of voltage and transistor M2 at transistor SW drain D 1
Voltage matched during inverse power supply threshold condition.Under output current Ia (for example, minimum output current level), electric current ISensing
It is substantially the same with electric current IS2, and be total to by transistor M1, M3, M4, M5, M6, M7, M11, M9, M13 and M12 common source formed
Grid mirror structure helps to ensure that the voltage at transistor SW drain D 1 is approximately equal to the voltage at transistor M2 drain D 2.
By making the voltage matches at D1 and D2, biasing circuit 68 can help to be protected from the influence of temperature change.Fig. 6
It is to illustrate how that the V associated with temperature change can be mitigated by biasing circuit 68SensingThe exemplary diagram of change.Such as institute in Fig. 6
Show, lines 112 may correspond to the V produced in the first temperature T1Sensing, lines 114 may correspond to second temperature T2 produce VSensing,
Lines 116 may correspond to the V produced in the 3rd temperature T3Sensing.Under the output current in window 118 around electric current Ia, lines
112nd, 114 and 116 can have little distinction (for example, VSensingMay be insensitive to the temperature change in window 118).
If desired, adjustable produce voltage VSensingResiding threshold current Ia.Can be by the electricity of adjustment circuit branch 102
The difference between I1 and the electric current Is2 of circuit branch 104 is flowed to adjust threshold current Ia.For example, can relative to transistor width
Length adjusts transistor M9 W/L than (W/L), with the difference between control electric current I1 and electric current Is2.In order to increase electric current Is2,
Transistor M12 W/L can be increased relative to transistor M9 (for example, by increasing transistor M12 W or reducing transistor M9's
W).Fig. 7 is to illustrate how to control threshold current Ia exemplary figure by adjusting current mirror transistor M9 and M12 size
Solution.
As shown in Figure 7, lines 122 may correspond to threshold current Ia.Biasing circuit and current-voltage amplifier circuit 26
Threshold current can increase to threshold current Ia ' by reducing the ratio of the W/L between transistor M12 and M9.For example, can phase
For transistor M9 W/L reduction transistors M12 W/L ratio.Under this situation, pass through transistor M12 electric current Is2
It can reduce with respect to transistor M9 electric current I1, this just provides for any given output current I increases and extremely senses electricity
The device R magnitude of current is hindered (for example, for any given output current I, the sensed voltage of lines 126 can be more than lines 122
Sensed voltage).Similarly, threshold current can be decreased to Ia " by the W/L for the W/L and M9 for increasing M12 ratio.
Fig. 8 is the exemplary diagram for controlling circuit 24, and control circuit 24 is provided in response to being produced by circuit 26
Raw sensed voltage VSensingAnd generate control signal Vcnt.As shown in Figure 8, control circuit 24 may include the He of comparator 132
134, the receiving voltage V of comparator 132 and 134SensingAnd by VSensingIt is compared with corresponding reference voltage Vref 1 and Vref2.
Vref1 can be adapted for the voltage of the detection big voltage associated with serious inverse power supply situation (for example, working as VSensingDuring more than Vref1
C1 can be asserted).Vref2 can be adapted for the voltage of the detection small voltage associated with the inverse power supply situation of appropriateness (for example, working as
VSensingC2 can be asserted during more than Vref2).For example, Vref1 can be in I by circuit 26SensingThe voltage sensed when being about 200mA,
And Vref2 can be in I by circuit 26SensingThe voltage sensed when being about 5mA.What the example was merely an illustrative.Vref1 and
Vref2 can be any desired voltage for detecting inverse power supply situation.
Detection circuit 136 can receive signal C2 from comparator 134 and detect when C2 is lasted longer than by continuous assert
The time of predetermined time threshold (for example, the desired threshold duration of 10uS, 100uS or any other).For example,
When the output of comparator 134 is continuously asserted the time for lasting longer than 10uS, detection circuit 136 can assert offer to control
The detection signal D1 of circuit 138.What the example was merely an illustrative.Detection circuit 136 can be configured with any desired
Time threshold.For example, the inverse supply current amount of appropriateness from electronic equipment 14 can be subjected to based on the adjuster circuit 18 of equipment 10
Ability determine time threshold.
Detection circuit 136 may include the detection circuit based on numeral and/or simulation.For example, detection circuit 136 may include base
In the counter of clock, the output of the counter detection comparator 134 continuously asserted by clock periodicity.This
Under situation, detection circuit 136 may be in response to determines counting device and reach predetermined value (such as counter threshold) and break
Speech detection signal D1.The example is only exemplary.If desired, detection circuit 136 may include the detection electricity based on state machine
Any desired circuit how long has continuously been asserted in the output on road, the detection circuit based on RC or detection comparator 134.
Fig. 9 is the exemplary diagram for showing to control operation of the circuit 24 during inverse power supply situation.As shown in Figure 9,
The initial possibility vibrations of equipment output current I (for example, when supplying electric power to annex 14 from main frame 10, it is related to path 16 and 17
The power source path inductance of connection may cause ringing).Initial ringing vibration can have enough values to carry out trigger comparator
134 assert that signal C2 (is more than for example, can produce had value during time T1 and T2 during time T1 and T2
Vref2 corresponding VSensingVoltage).However, detection circuit 136 can determine that time T1 and T2 duration is not enough, and detect letter
Number D1 can keep being deasserted.
During time T3, serious inverse power supply situation may occur, and wherein equipment 10 receives enough inverse power supplies to touch
Hair comparator 132 is (for example, electric current I can be that the V more than Vref1 is produced for circuit 26SensingBorn enough for voltage).This
Under kind of situation, control circuit 138 can disable transistor SW with protection equipment 10 from inverse power supply situation influence (for example, passing through
Deassert Vcnt).
Figure 10 is the exemplary diagram for showing to control operation of the circuit 24 during the inverse power supply situation of appropriateness.As in Figure 10
Shown, equipment output current I can be stabilized to the negative current of appropriate value (for example, in initial ringing after initial ringing vibration
After vibration, the amount of inverse supply current can be enough trigger comparator 134 and signal C2 is asserted during period T5, but can be not enough to
Trigger comparator 132).In Figure 10 example, detection circuit 136 can assert detection signal D1 (examples at the end of period T5
Such as, because signal C2 is continuously asserted the time for lasting longer than predetermined threshold value).Control circuit 138 may be in response to letter
Number asserting for D1 and deassert Vcnt.
Figure 11 is to show to control how circuit 24 can be used for by providing control signal Vs to the grid of absorbing crystal pipe 202
To control an exemplary diagram of absorbing crystal pipe 202.Control signal Vs can be based on being provided by current-voltage amplifier circuit 26
Voltage VSensingTo determine.During inverse power supply situation, control circuit 24 can be controlled by transistor using control signal Vs
202 absorption electric current Is, inverse supply current is transferred out from power regulator circuitry 18.
It is configured as providing electric power by the road radial attachment including power circuit there is provided a kind of according to one embodiment
Electronic equipment, the electronic equipment includes：The power regulator circuitry of supply voltage is provided to power circuit；It is inserted in power circuit
In the first transistor；Second transistor, the first transistor and second transistor formation current mirror, the current mirror, which is produced, indicates stream
Cross the signal of the magnitude of current of the first transistor；And circuit, when signal designation flows through the electric current and the wherein electricity of the first transistor
When the inverse power supply situation that sub- equipment receives electric power from the annex is associated, the circuit provides control signal to close to the first transistor
Disconnected the first transistor.
According to another embodiment, the circuit includes the control circuit for monitoring the sensing voltage proportional to signal, first
Voltage drop response on transistor changes the first amount in the given change for the electric current for flowing through the first transistor, and sensing voltage rings
Ying Yu flows through the given change of the electric current of the first transistor and changes the second amount, and the second amount is more than the first amount.
According to another embodiment, the circuit includes the current-voltage amplifier for converting the signal into sensing voltage.
According to another embodiment, the current-voltage amplifier includes coupling to form the paired of common grid amplifier
Transistor.
According to another embodiment, the control circuit includes the comparator for receiving sensing voltage and reference voltage.
According to another embodiment, the first transistor has the first source electrode, the first drain electrode and first grid, and second
Transistor has the second source electrode, the second drain electrode and second grid, and the electronic equipment also includes making the second drain electrode biasing match the
The biasing circuit of voltage in one drain electrode.
According to another embodiment, the current mirror includes being coupled to the first source electrode into the first line of the second source electrode, and
The second circuit including first grid to be coupled to second grid.
According to another embodiment, the circuit is configured to respond to determine the electric current for flowing through the first transistor higher than given
Threshold value and control signal is asserted to connect the first transistor, and the circuit is configured to respond to determination and flows through second transistor
Electric current less than the given threshold value and control signal is deasserted to turn off the first transistor.
According to another embodiment, the given threshold value has negative value, and the control circuit has with first input end and the
The comparator of two inputs, and second input is configured as receiving the reference voltage of the expression threshold value.
According to another embodiment, the electronic equipment includes being selected from following equipment：It is cell phone, tablet personal computer, portable
Formula computer and media player, the electronic equipment also include storage and process circuit.
According to one embodiment, there is provided prevented in a kind of electronic equipment during inverse power supply situation from external equipment to electricity
Sub- equipment transmits the protection circuit of electric power, and the protection circuit includes：The first transistor of power input-lead-out terminal is coupled to,
During at least some operations of the protection circuit, source current flows through the first transistor；Second transistor, second transistor coupling
The first transistor is connected to form current mirror, the current mirror produces the sensing proportional to flowing through the source current of the first transistor
Electric current；And to the circuit that sensing electric current is responded, during inverse power supply situation, the circuit is provided to turn off first crystal
The control signal of pipe.
According to another embodiment, the circuit includes the current-voltage amplifier that sensing electric current is converted into sensing to voltage.
According to another embodiment, the circuit includes monitoring sensing voltage and provides control signal based on sensing voltage
Control circuit.
According to another embodiment, the control circuit includes comparator, and the comparator has receive sensing voltage first
Input and the second input for receiving reference voltage.
According to another embodiment, the circuit includes biasing circuit, and the biasing circuit makes the drain electrode in second transistor
Voltage bias is to match the drain voltage of the first transistor.
According to another embodiment, the biasing circuit includes current source.
According to one embodiment there is provided a kind of electronic equipment, the electronic equipment includes：First input-output terminal；Second
Input-output terminal；It is coupled to the earthing power supply circuit of the second input-output terminal；It is coupled to the first input-output terminal
Positive supply circuit；It is coupled to the first transistor of positive supply circuit；It is brilliant to form the second of current mirror to be coupled to the first transistor
Body pipe, the current mirror produces the sensing electric current of the current in proportion with flowing through the first transistor and positive supply circuit；And will sense
Survey the current-voltage amplifier circuit that electric current is converted into sensing voltage.
According to another embodiment, the current-voltage amplifier includes the resistor that sensing electric current is flowed through.
According to another embodiment, the electronic equipment includes control circuit, and the control circuit receives sensing voltage and produced
The corresponding control signal of raw control the first transistor.
According to another embodiment, the control circuit includes comparator, and the comparator has receive sensing voltage first
Input and the second input for receiving reference voltage, the electronic equipment also include signal wire, and control signal passes through the signal wire
It is provided to the grid of the first transistor.
According to one embodiment there is provided a kind of electronic equipment, the electronic equipment includes：Power supply terminal；It can be used to lead to
Cross the power regulator circuitry that power supply terminal supplies electric power to external equipment；The protection circuit of power supply terminal is coupled to, the protection
Circuit is configured as detecting inverse power supply situation, and in inverse power supply situation, the electronic equipment receives electric current at power supply terminal, and
The protection circuit is further configured to make power regulator circuitry with power supply terminal break in response to detecting inverse power supply situation
Open electrical connection.
It is configured as providing electric power by the road radial attachment including power circuit there is provided a kind of according to one embodiment
Electronic equipment, the electronic equipment includes：The power regulator circuitry of supply voltage is provided to power circuit；It is inserted in power circuit
In the first transistor；Second transistor, the first transistor and second transistor formation current mirror, the current mirror, which is produced, indicates stream
Cross the signal of the magnitude of current of the first transistor；The biasing circuit of the first transistor and second transistor is coupled to, the biasing circuit
The current offset for second transistor is provided, the biasing circuit includes being formed in addition by least one cascode transistors
Current mirror；And circuit is controlled, the control circuit can be used to control the first crystalline substance based on the signal produced by current mirror
Body pipe.
According to another embodiment, the biasing circuit includes the first branch and the second branch, the electricity for second transistor
The Part I of stream biasing flows through the first branch, and the Part II of current offset flows through the second branch.
According to another embodiment, first branch includes resistor, and signal on resistor and current offset
The associated voltage drop of Part I produce.
According to another embodiment, current mirror in addition includes the 4th crystal of third transistor and mirror image third transistor
Pipe, and cascode transistors are coupled to the 4th transistor.
According to another embodiment, the current mirror includes the first current mirror, and the other current mirror includes the second current mirror,
The 5th transistor that the Part II of first branch including current offset is flowed through, the 5th transistor AND gate third transistor formation the
Three current mirrors, and the breadth length ratio that has of the 5th transistor of the 3rd current mirror is different from the 4th transistor of the second current mirror
Breadth length ratio.
According to one embodiment there is provided a kind of electronic equipment, the electronic equipment includes：Power supply terminal；It can be used to lead to
Cross the power regulator circuitry that power supply terminal supplies electric power to external equipment；And the protection circuit of power supply terminal is coupled to, should
Protection circuit is configured as detecting inverse power supply situation, and in inverse power supply situation, the electronic equipment receives electric current at power supply terminal
The continuous time of threshold value is continued above, and the protection circuit is further configured to make in response to detecting inverse power supply situation
Power regulator circuitry disconnects with power supply terminal to be electrically connected.
According to another embodiment, the protection circuit includes：Current mirror, the current mirror, which is produced, indicates the electronic equipment in electricity
The signal of the magnitude of current received at source terminal；First comparator, the first comparator carries out the signal and the first reference voltage
Compare to produce the first control signal；And second comparator, second comparator carries out the signal and the second reference voltage
Compare to produce the second control signal, first reference voltage is more than second reference voltage.
According to another embodiment, the protection circuit also includes receiving the second control signal and produces the inspection of detection signal
When slowdown monitoring circuit, the control signal of detection signal identification second is continuously asserted the time for being continued above the threshold value.
According to another embodiment, the electronic equipment includes the control circuit for receiving the first control signal and detection signal,
The control circuit is configured to respond to the first asserting for control signal and power regulator circuitry is disconnected electricity with power supply terminal
Connection.
According to another embodiment, the detection circuit is configured to respond to the second control signal of mark and continuously asserted
It is continued above the time of the threshold value and asserts detection signal, and the control circuit is further configured in response to detection signal
Assert and disconnect power regulator circuitry and power supply terminal and electrically connect.
The principle described above being illustrative of the invention, and in the case where not departing from scope and spirit of the present invention, this
Various modifications may be made by the technical staff in field.Above-described embodiment can individually be implemented or can implement in any combination.
Claims (20)
1. a kind of electronic equipment for being configured as providing electric power by the road radial attachment including power circuit, the electronic equipment
Including：
Power regulator circuitry, the power regulator circuitry provides supply voltage to the power circuit；
The first transistor, the first transistor is inserted in the power circuit；
Second transistor, wherein the first transistor and second transistor formation current mirror, the current mirror, which is produced, to be referred to
It is shown with the signal how many electric current are just flowing through the first transistor；With
Circuit, it is described when the electric current that the signal designation flows through the first transistor is associated with inverse power supply situation
Circuit provides control signal to turn off the first transistor to the first transistor, wherein under the inverse power supply situation,
The electronic equipment receives electric power from the annex.
2. electronic equipment according to claim 1, wherein the circuit includes monitoring the sensing proportional to the signal
The control circuit of voltage, wherein the given change of the electric current in response to flowing through the first transistor, the first crystal
Voltage drop on pipe changes the first amount, wherein the given change of the electric current in response to flowing through the first transistor
Change, the sensing voltage changes the second amount, and wherein described second amount is more than first amount.
3. electronic equipment according to claim 2, wherein the circuit includes converting the signal into the sensing electricity
The current-voltage amplifier of pressure, the current-voltage amplifier includes coupling to form the paired crystal of common grid amplifier
Pipe, and the control circuit includes the comparator of the reception sensing voltage and reference voltage.
4. electronic equipment according to claim 1, wherein the first transistor has the first source electrode, the first drain electrode and the
One grid, and wherein described second transistor has the second source electrode, the second drain electrode and second grid, and the electronic equipment is also wrapped
Biasing circuit is included, the biasing circuit makes the second drain electrode biasing to match the voltage in first drain electrode, and wherein
The current mirror includes being coupled to first source electrode into the first line of second source electrode, and including by the first grid
Pole is coupled to the second circuit of the second grid.
5. electronic equipment according to claim 1, wherein the circuit, which is configured to respond to determination, flows through described first
The electric current of transistor asserts the control signal to connect the first transistor, and wherein institute higher than given threshold value
Circuit is stated to be configured to respond to determine that the electric current for flowing through the second transistor releases disconnected less than the given threshold value
The control signal is sayed to turn off the first transistor, wherein the given threshold value has negative value, the control circuit has
Comparator with first input end and the second input, and second input is configured as the reception expression threshold value
Reference voltage.
6. electronic equipment according to claim 1, wherein the electronic equipment includes being selected from following equipment：Honeycomb electricity
Words, tablet personal computer, portable computer and media player, the electronic equipment also include storage and process circuit.
7. being prevented during inverse power supply situation in a kind of electronic equipment transmits electric power from external equipment to the electronic equipment
Protection circuit, the protection circuit includes：
The first transistor, the first transistor is coupled to power input-lead-out terminal, wherein in the protection circuit at least
During certain operations, source current flows through the first transistor；
Second transistor, the second transistor is coupled to the first transistor to form current mirror, wherein the current mirror
Produce the sensing electric current proportional to the source current for flowing through the first transistor；With
Circuit, the circuit is responded to the sensing electric current, during the inverse power supply situation, and the circuit, which is provided, to be used to
Turn off the control signal of the first transistor.
8. protection circuit according to claim 7, wherein the circuit includes the sensing electric current being converted into sensing electricity
The current-voltage amplifier of pressure, the circuit includes monitoring the sensing voltage and provides described based on the sensing voltage
The control circuit of control signal, and the control circuit includes comparator, and the comparator, which has, receives the sensing voltage
First input end and receive reference voltage the second input.
9. protection circuit according to claim 7, wherein the circuit includes biasing circuit, the biasing circuit makes described
Drain voltage in second transistor is biased to match the drain voltage of the first transistor, and the biasing circuit includes
Current source.
10. a kind of electronic equipment, including：
First input-output terminal；
Second input-output terminal；
Earthing power supply circuit, the earthing power supply circuit is coupled to the second input-output terminal；
Positive supply circuit, the positive supply circuit is coupled to the first input-output terminal；
The first transistor, the first transistor is coupled to the positive supply circuit；
Second transistor, the second transistor is coupled to the first transistor to form current mirror, wherein the current mirror
Produce and flow through the first transistor and the sensing electric current of the current in proportion of the positive supply circuit；With
The sensing electric current is converted into sensing voltage by current-voltage amplifier circuit, the current-voltage amplifier circuit.
11. electronic equipment according to claim 10, wherein the current-voltage amplifier includes the sensing electric current stream
The resistor of warp.
12. electronic equipment according to claim 11, in addition to control circuit, the control circuit receive the sensing electricity
The corresponding control signal for controlling the first transistor is pressed and produces, wherein the control circuit includes comparator, the comparison
Utensil has the first input end for receiving the sensing voltage and the second input for receiving reference voltage, and the electronic equipment is also wrapped
Signal wire is included, wherein the control signal is provided to the grid of the first transistor by the signal wire.
13. a kind of electronic equipment, including：
Power supply terminal；
Power regulator circuitry, the power regulator circuitry can be used to supply to external equipment by the power supply terminal
Electric power；
Protection circuit, the protection circuit is coupled to the power supply terminal, wherein the protection circuit is configured as detecting inverse confession
Electric situation, wherein under the inverse power supply situation, the electronic equipment receives electric current, and wherein institute at the power supply terminal
Protection circuit is stated to be further configured to make the power regulator circuitry and institute in response to detecting the inverse power supply situation
State power supply terminal and disconnect electrical connection.
14. a kind of electronic equipment for being configured as providing electric power by the road radial attachment including power circuit, the electronics is set
It is standby to include：
Power regulator circuitry, the power regulator circuitry provides supply voltage to the power circuit；
The first transistor, the first transistor is inserted in the power circuit；
Second transistor, wherein the first transistor and second transistor formation current mirror, the current mirror, which is produced, to be referred to
It is shown with the signal how many electric current are just flowing through the first transistor；
Biasing circuit, the biasing circuit is coupled to the first transistor and the second transistor, and the biasing circuit is carried
For the current offset for the second transistor, wherein the biasing circuit is included by least one cascode transistors shape
Into other current mirror；With
Control circuit, the control circuit can be used to control described the by the current mirror based on the signal produced
One transistor.
15. electronic equipment according to claim 14, wherein the biasing circuit includes the first branch and the second branch, its
In be used for the Part I of the current offset of the second transistor and flow through first branch, and the current offset
Part II flow through second branch.
16. electronic equipment according to claim 15, wherein first branch includes resistor, and wherein described letter
The voltage drop associated with the Part I of the current offset number on the resistor is produced.
17. electronic equipment according to claim 15, wherein other current mirror is included described in third transistor and mirror image
4th transistor of third transistor, and wherein described cascode transistors are coupled to the 4th transistor, wherein institute
Stating current mirror includes the first current mirror, wherein the other current mirror includes the second current mirror, wherein first branch wraps
The 5th transistor that the Part II of the current offset is flowed through is included, wherein the 3rd crystal described in the 5th transistor AND gate
Pipe the 3rd current mirror of formation, and the breadth length ratio that has of the 5th transistor of wherein described 3rd current mirror is different from institute
State the breadth length ratio of the 4th transistor of the second current mirror.
18. a kind of electronic equipment, including：
Power supply terminal；
Power regulator circuitry, the power regulator circuitry can be used to supply to external equipment by the power supply terminal
Electric power；With
Protection circuit, the protection circuit is coupled to the power supply terminal, wherein the protection circuit is configured as detecting inverse confession
Electric situation, wherein under the inverse power supply situation, the electronic equipment receives electric current at the power supply terminal and is continued above threshold
The continuous time of value, and wherein described protection circuit is further configured to make in response to detecting the inverse power supply situation
The power regulator circuitry disconnects with the power supply terminal to be electrically connected.
19. electronic equipment according to claim 18, wherein the protection circuit includes：
Current mirror, the current mirror produces the signal for indicating the electronic equipment receives how many electric current at the power supply terminal；
The signal and the first reference voltage are compared to produce the first control letter by first comparator, the first comparator
Number；With
The signal and the second reference voltage are compared to produce the second control letter by the second comparator, second comparator
Number, wherein first reference voltage is more than second reference voltage.
20. electronic equipment according to claim 19, wherein the protection circuit also includes：
Circuit is detected, the detection circuit receives second control signal and produces detection signal, the detection signal identification
When second control signal continuously asserted the time for being continued above the threshold value, in addition to：
Circuit is controlled, the control circuit receives first control signal and the detection signal, wherein the control circuit
It is configured to respond to first the asserting for control signal and the power regulator circuitry is disconnected with the power supply terminal
Electrical connection, is continued above by continuous assert wherein the detection circuit is configured to respond to mark second control signal
The time of the threshold value and assert the detection signal, and wherein it is described control circuit be further configured in response to described
Detect asserting for signal and the power regulator circuitry is disconnected with the power supply terminal and electrically connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710687212.5A CN107390768B (en) | 2012-06-15 | 2013-06-03 | Power protection circuit for electronic equipment |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201261660634P | 2012-06-15 | 2012-06-15 | |
| US61/660,634 | 2012-06-15 | ||
| US13/629,276 | 2012-09-27 | ||
| US13/629,276 US9329697B2 (en) | 2012-06-15 | 2012-09-27 | Electronic device power protection circuitry |
| PCT/US2013/043917 WO2013188155A1 (en) | 2012-06-15 | 2013-06-03 | Electronic device power protection circuitry |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710687212.5A Division CN107390768B (en) | 2012-06-15 | 2013-06-03 | Power protection circuit for electronic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104335437A CN104335437A (en) | 2015-02-04 |
| CN104335437B true CN104335437B (en) | 2017-08-01 |
Family
ID=49758627
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380027991.6A Active CN104335437B (en) | 2012-06-15 | 2013-06-03 | Electronic equipment electric power protection circuit |
| CN201710687212.5A Active CN107390768B (en) | 2012-06-15 | 2013-06-03 | Power protection circuit for electronic equipment |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710687212.5A Active CN107390768B (en) | 2012-06-15 | 2013-06-03 | Power protection circuit for electronic equipment |
Country Status (3)
| Country | Link |
|---|---|
| KR (2) | KR20170038126A (en) |
| CN (2) | CN104335437B (en) |
| WO (1) | WO2013188155A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994547B (en) | 2015-09-21 | 2022-04-01 | 西普托特技术有限责任公司 | Single transistor device and method for protecting a circuit |
| US10027107B2 (en) | 2016-04-05 | 2018-07-17 | Apple Inc. | Electronic device with reverse voltage protection circuitry for multiple control lines |
| CN106559567A (en) * | 2016-11-15 | 2017-04-05 | 捷开通讯(深圳)有限公司 | High current control method and mobile communication terminal |
| TWI641221B (en) * | 2017-05-08 | 2018-11-11 | 聯發科技股份有限公司 | Interface circuit of an electronic device |
| US10819074B2 (en) * | 2018-05-08 | 2020-10-27 | Semiconductor Components Industries, Llc | Overvoltage protection circuit for USB connector |
| CN110469948B (en) * | 2019-09-16 | 2024-08-13 | 宁波奥克斯电气股份有限公司 | Protection locking and unlocking circuit and air conditioner |
| CN114489217B (en) * | 2020-11-11 | 2024-11-05 | 扬智科技股份有限公司 | Signal receiving device and bias correction circuit thereof |
| CN113533829B (en) * | 2021-09-15 | 2021-12-10 | 武汉市聚芯微电子有限责任公司 | Current detection circuit and method |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5532623A (en) * | 1994-10-21 | 1996-07-02 | Waferscale Integration, Inc. | Sense amplifier with read current tracking and zero standby power consumption |
| KR0164528B1 (en) * | 1995-10-24 | 1999-03-20 | 김광호 | Power supply independent type constant current source circuit |
| ITVA20000031A1 (en) * | 2000-09-07 | 2002-03-07 | St Microelectronics Srl | DETECTION OF THE CURRENT DELIVERED TO A LOAD. |
| JP2002335626A (en) * | 2001-05-10 | 2002-11-22 | Nec System Technologies Ltd | Reverse current protection circuit |
| JP4467963B2 (en) * | 2003-12-03 | 2010-05-26 | 株式会社東芝 | Regulator device and backflow prevention diode circuit used therefor |
| JP3961505B2 (en) * | 2004-04-13 | 2007-08-22 | 松下電器産業株式会社 | Voltage detection circuit, power supply device and semiconductor device |
| DE102007002334B4 (en) * | 2006-01-20 | 2009-06-25 | Denso Corporation, Kariya | Overcurrent detection circuit |
| US20080204958A1 (en) * | 2007-02-27 | 2008-08-28 | Intersil Americas Inc. | Back-current protection circuit |
| US8945735B2 (en) * | 2009-02-23 | 2015-02-03 | Samsung Sdi Co., Ltd. | Built-in charge circuit for secondary battery and secondary battery with the built-in charge circuit |
-
2013
- 2013-06-03 WO PCT/US2013/043917 patent/WO2013188155A1/en active Application Filing
- 2013-06-03 KR KR1020177008619A patent/KR20170038126A/en not_active Application Discontinuation
- 2013-06-03 KR KR20147033068A patent/KR20150004886A/en active Application Filing
- 2013-06-03 CN CN201380027991.6A patent/CN104335437B/en active Active
- 2013-06-03 CN CN201710687212.5A patent/CN107390768B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107390768B (en) | 2020-03-10 |
| KR20150004886A (en) | 2015-01-13 |
| CN104335437A (en) | 2015-02-04 |
| CN107390768A (en) | 2017-11-24 |
| KR20170038126A (en) | 2017-04-05 |
| WO2013188155A1 (en) | 2013-12-19 |
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