CN104335437A - Electronic device power protection circuitry - Google Patents
Electronic device power protection circuitry Download PDFInfo
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- CN104335437A CN104335437A CN201380027991.6A CN201380027991A CN104335437A CN 104335437 A CN104335437 A CN 104335437A CN 201380027991 A CN201380027991 A CN 201380027991A CN 104335437 A CN104335437 A CN 104335437A
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- transistor
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- voltage
- power supply
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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
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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
-
- 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)
- Protection Of Static Devices (AREA)
- Dc-Dc Converters (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A host electronic device may be coupled to an accessory electronic device. During normal operation, the host device may supply the accessory device with power over a power supply line. Back-powering events in which the accessory device delivers power to the host device may be prevented by interposing a protection transistor in the power supply line. A current mirror may be formed using the protection transistor and an additional transistor that produces a sense current proportional to the amount of current that is flowing through the power supply line. A current -to- voltage amplifier may produce a sense voltage that is proportional to the sense current. A bias circuit may be used to bias the sense current through the current mirror. A control circuit may compare the sense voltage to one or more reference voltages and turn off the protection transistor when appropriate to prevent back- powering of the host device.
Description
The U.S. Patent application 13/629 of patent application claims submission on September 27th, 2012,276, the U.S. Provisional Patent Application 61/660 submitted on June 15th, 2012, the U.S. Provisional Patent Application 61/664 that on June 26th, 634 and 2012 submits to, the priority of 691, described patent application is incorporated to herein in full with way of reference accordingly.
Background technology
The present invention relates generally to electronic equipment, and more specifically, relates to the electric power protection circuit for electronic equipment.
Electronic equipment (such as cell phone, media player, panel computer and miscellaneous equipment) is often coupled to annex.Such as, accessory device can have display, loud speaker or host electronic appliance other assembly spendable when playing media file or other content for user.
In the normal operation period, main process equipment can supply electric power to annex.If annex defectiveness or design improper, so annex may be supplied electric power to main process equipment instead of draw electric power from main process equipment.This behavior that sometimes can be called as inverse power supply may cause damage to main process equipment.
Therefore, the protective circuit that can be provided for preventing the infringement caused because of inverse power supply when annex is coupled to electronic equipment will be expected.
Summary of the invention
Annex may carry out inverse power supply to host electronic appliance potentially.In order to prevent causing damage to host electronic appliance, electronic equipment can have protective circuit.Whenever inverse power supply situation being detected, protective circuit can be used for blocking the current flowing between annex and main process equipment.
Host electronic appliance is coupled to accessory electronic device by power source path.In the normal operation period, main process equipment supplies electric power by power circuit to accessory device.In some cases, annex may be attempted to transmit electric power to main process equipment.Such inverse powered operation is less desirable, and by inserting protective transistor to stop in power circuit.Protective transistor and another transistor can be used to form current mirror.Biasing circuit can be used keep the described drain electrode of another transistor to be substantially in identical voltage with the drain electrode of protective transistor, thus improve the accuracy of current mirror.Such as, biasing circuit can comprise the mirror transistor arranging formation with cascade.Biasing circuit can be used be biased the electric current flowing through another transistor described to mate predetermined bias current.By the current offset flowing through another transistor described being become predetermined bias current and using cascade to arrange, the change joined with temperature correlation can be alleviated.
Current mirror can produce the current sensor proportional with the current magnitude of current flowing through protective transistor and power circuit.Current-voltage amplifier can produce the sensing voltage proportional with current sensor.If needed, biasing circuit can be configured such that current-voltage amplifier produces and deduct the proportional sensing voltage of predetermined bias current with current sensor.Control circuit can use comparator sensing voltage and reference voltage to be compared.
Whenever sensing voltage be in instruction electric power flow to the level of annex from main process equipment time, control circuit can connect protective transistor to allow main frame for accessories.As long as the reverse current that power circuit occurs is no more than acceptable little amount, also protective transistor can be connected.When inverse power supply situation being detected, control circuit breakable transistor is flow into main process equipment from annex by power circuit to prevent electric current.
Control circuit can use the first comparator to detect serious inverse power supply situation.Control circuit can use the second comparator and testing circuit to detect duration long appropriateness against power supply situation.In response to detecting that serious inverse power supply situation or duration long appropriateness are against power supply situation, control circuit can turn-off protection transistor.
Absorbing crystal pipe can be coupled to power circuit to be shifted away from the power circuit of equipment by inverse supply current.Absorbing crystal pipe can be controlled based on sensing voltage by control circuit, 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 present invention, essence of the present invention and various advantage will become more apparent.
Accompanying drawing explanation
Fig. 1 is that wherein host electronic appliance is coupled to the diagram of a kind of system of accessory electronic device according to an embodiment of the invention.
Fig. 2 illustrates the figure that can measure the signal detecting inverse power supply situation in the electronic device according to one embodiment of the invention.
Fig. 3 is the circuit diagram of exemplary according to an embodiment of the invention protective circuit.
Fig. 4 is the circuit diagram according to an embodiment of the invention with the exemplary protective circuit that cascade mirror is arranged.
Fig. 5 illustrates how the voltage be sensed can depend on the diagram of the output current of the circuit of Fig. 4.
Fig. 6 is the diagram of the change joined with temperature correlation illustrating how the circuit of Fig. 4 can help to alleviate the voltage be sensed according to one embodiment of the invention.
Fig. 7 illustrates the diagram that how the regulation of electrical circuit of Fig. 4 can be become different offset control according to one embodiment of the invention.
Fig. 8 be can detect according to an embodiment of the invention serious in the diagram of appropriateness against the exemplary control circuit of power supply situation.
According to one embodiment of the invention, Fig. 9 illustrates how the control circuit of Fig. 8 can respond the sequential chart of serious inverse power supply situation.
According to one embodiment of the invention, Figure 10 illustrates how the control circuit of Fig. 8 can respond the sequential chart of the inverse power supply situation of appropriateness.
Figure 11 is the diagram of the exemplary protective circuit according to an embodiment of the invention with absorbing crystal pipe.
Embodiment
A kind of illustrative system of the electronic equipment with protective circuit is comprised shown in Fig. 1.As shown in fig. 1, system 8 can comprise main process equipment (such as electronic equipment 10) and accessory device (such as electronic equipment 14 or other external equipment).Path 12 can be used for coupling access equipment 10 and 14.Path 12 can comprise power line, the positive power line 16 that such as positive supply electric current flows through and the ground connection power line 17 that earthing power supply electric current flows through.Path 12 also can comprise analog signal line and/or digital signal line (such as, paired data wire etc.).When electric power is sent to annex 14 from main frame 10, the electric current I flowing through circuit 16 will for just.
Equipment 10 can have the input-output port with input-output power supply terminal T1 and T2.Equipment 14 can have the input-output port with input-output power supply terminal T3 and T4.Terminal T1 and T3 can be positive power terminal.Terminal T2 and T4 can be ground power terminals.Time together with equipment 10 is coupled in equipment 14, terminal T1 can be electrically connected to terminal T3 via circuit 16, and terminal T2 can be connected to terminal T4 via circuit 17.Conductive path 16 and 17 can form a part for cable, or is formed by the directly contact between terminal T1 and T2 and between terminal T3 and T4.Terminal T1 and T2 can be associated with the contact in the connector (the input-output connector in the input-output port such as, on equipment 10) in equipment 10.Terminal T3 and T4 can be associated with the contact in the connector (in the input-output port such as, on equipment 14 input-output connector) in equipment 14.
Electronic equipment (equipment 10 and 14 of such as Fig. 1) can be: cell phone; Media player; Other handheld portable devices; Portable set less a little, such as watch equipment, hanging equipment or other wearable or micromodule equipment; Game station; Panel computer; Notebook computer; Desktop computer; Television set; Computer monitor; Be incorporated into the computer in computer monitor; Embedded device, the equipment in such as automobile; Comprise for presenting the loud speaker of sound and/or video and/or the equipment of monitor to user; Or other electronic equipment.Such as, host electronic appliance 10 can be cell phone, media player or computer, and accessory electronic device 14 can be comprise loud speaker for presenting from audio frequency to user and/or the equipment for display from video to user that present.Data path by being associated with path 12 provides the audio frequency and/or video content that will be shown from equipment 10 to equipment 14.
Main frame 10 can comprise Storage and Processing circuit 30 and input-output circuit 28.Electronic equipment 14 can comprise Storage and Processing circuit 48 and input-output circuit 50.Storage and Processing circuit 30 and 48 can comprise one or more integrated circuit, such as memory circuitry, processor and application-specific integrated circuit (ASIC).Input-output circuit 28 and input-output circuit 50 can comprise user's interface unit, such as button, loud speaker, microphone, display, touch sensor and for collecting input or presenting the miscellaneous equipment of output to user.Input-output circuit 28 also can comprise wire communication circuit, radio communication circuit, transducer and other electronic equipment assembly.
The AC line power from wall socket or other alternating current (AC) electric power source (such as, AC source 20 and 52) can be used to come for equipment 10 and 14 supplies electric power.Also battery (such as battery 22 and 46) can be used to obtain electric power.
Power regulator circuitry 18 and 44 can be used for convert direct current (DC) electric power source after for the adjustment of the electric component of equipment 10 and 14 (no-voltage on the positive voltage on such as ,+terminal and – terminal or earthed voltage) to from the AC electric power in AC source or battery electric power.
In the normal operation period, the power regulator circuitry 18 of equipment 10 can provide positive voltage to node 38.Protective transistor SW (as protection switch) connects (that is, the switch formed by transistor can be closed), makes the voltage on node 38 be transported to node 36.Positive voltage node 36 in equipment 10 can be connected to the positive voltage node 54 in equipment 14 by positive signal line 16.Power ground line 17 can be used for the ground connection 58 ground connection 56 in equipment 14 be connected in equipment 10.
When transistor SW connects in the normal operation period, main process equipment 10 can supply electric power via path 12 to annex 14.Therefore, positive current I can flow along circuit 16.Do not have in the annex of electric power source, there is not the risk of inverse power supply situation.But if equipment 14 breaks down or designs improper, so power regulator circuitry 44 may attempt to transmit electric power via path 12 to equipment 10.In this type of situation, circuit 16 may generate negative value electric current I.
In order to prevent causing damage to equipment 10, equipment 10 is once detecting that inverse power supply situation can turn off transistor SW (that is, can cut-off switch SW).Such as, I value lower than-5mA or other suitable threshold value time (that is, electric current I value higher than during given threshold value and in the polarity of electric current I for time negative), breakable transistor SW to form open circuit between drain D 1 and source S 1.
Control circuit 24 can be used for the state controlling transistor SW in the following manner: apply control signal, such as control voltage Vcnt via control line 42 to the grid G 1 of transistor SW.When (assert) control signal Vcnt asserted by control circuit 24, transistor SW can be connected and flow to path 12 to allow electric power from power regulator circuitry 18.When (deassert) control Vcnt is asserted in control circuit 24 releasing, breakable transistor SW flows to equipment 10 to block current flow from apparatus 14, thus proterctive equipment 10 avoids damaging during inverse power supply event.
Control circuit 24 can use current sensing circuit, such as have the current mirroring circuit of biasing circuit and current-voltage amplifier circuit (that is, circuit 26) monitors the magnitude of current flowing through transistor SW.Circuit 26 can utilize path 32 to be coupled to terminal 36, and can be coupled to terminal 38 via path 34.Circuit 26 can be coupled to the grid of transistor SW via path 66.During operation, the assembly of circuit 26 can form current mirror with transistor SW.The current mirror of circuit 26 and associated circuits can be conducive to monitoring current I.
When electric current I flows through transistor SW, between terminal 36 and 38, be formed into the voltage drop V of ratio
fall.Because transistor SW connects, so V
fallvalue may be relatively very little, thus to make based on V
fallchallenging and the noise effect be subject to potentially on circuit 16 of the measurement that I is carried out.Therefore, equipment 10 preferably includes the current mirror using transistor SW and circuit 26 to be formed.Current mirroring circuit and the current-voltage amplifier circuit be associated of equipment 10 can be used for the electric current I that will be sensed
sensingconvert to and voltage V
sensing, the electric current I be sensed
sensingthe small area analysis proportional with electric current I, voltage V
sensingproportional with electric current I.Control circuit 24 can via path 40 from circuit 26 reception voltage signal V
sensing.
As shown in by the curve 60 of Fig. 2, V
fallvalue on possible current margin (such as, being from-200mA to 500mA in the example of figure 2) may be relatively very little, and may can not change significantly with electric current I.As shown in by the lines 62 of Fig. 2, V
sensingvalue can significantly larger (such as, greatly such as 10 times to 100 times).Voltage V
sensingalso can change significantly with electric current I.Because V
sensingbe greater than V
fall, and more specifically, because V
sensingfor given electric current I change change (that is, the gradient of lines 62) be significantly greater than V
fallthe change (that is, the gradient of lines 62) for the change of identical given electric current I, so control circuit 24 uses V when carrying out the judgement about the state of transistor SW
sensingaccuracy can be improved.
Fig. 3 is the circuit diagram that the exemplary components that can be used for realizing circuit 26 and circuit 24 is shown.As shown in Figure 3, circuit 26 can comprise the transistor being configured to form current mirror with transistor SW, such as transistor M2.Circuit 26 also can comprise biasing circuit and current-voltage amplifier circuit 68.Biased can comprising with current-voltage amplifier circuit 68 is configured to drive current sensor I
sensingthrough resistor R to produce voltage V on circuit 40
sensingtransistor, 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 S2, drain terminal D2 and gate terminal G2.In order to the best accuracy of the current mirror that transistor SW and M2 is formed, wish that the source S 1 of transistor SW has identical voltage with the source S 2 of transistor M2 and the grid G 1 of transistor SW has identical voltage with the grid G 2 of transistor M2.This is electrically connected source S 1 and source S 2 by use circuit 32 and use circuit 66 is electrically connected grid G1 and grid G 2 realizes.
Also drain D 1 and D2 should be maintained and be in identical voltage to guarantee the exact operations of current mirror.The drain D 1 of transistor SW and M2 and D2 are not shorted together.But the biasing circuit of circuit 68 can be used for making node 72 (and the therefore drain D 2) voltage at place and the voltage matches at drain D 1 place.By using circuit 68 to force voltage levvl in drain D 2 close to the voltage levvl in drain D 1, the current mirror formed by transistor SW and M2 can produce current sensor I on circuit 32
sensing, this current sensor I
sensingfollow the value of the electric current I on circuit 14 exactly.In typically arranging one, transistor M2 and SW can be configured such that I
sensingthat the little mark of I (such as, makes I
sensingto 10 be equaled
-6* other suitable mark of I or I).Therefore, by electric current I that path 32 is drawn
sensingvalue be negligible and can be left in the basket, make the electric current (I) flowing through circuit 14 to be substantially equal to the value of the electric current flowing through transistor SW.
Transistor M1 and M6 can be formed for by electric current I
sensingconvert the voltage V on circuit 40 to
sensingcommon grid amplifier.As shown in Figure 3, transistor M6 is the diode (that is, drain D 6 is connected by path 76 with grid G 6) be connected.Current source 78 produces the bias current I of the upper DC voltage of setting drain D 6 (node 74)
biased.Node 74 is that (that is, transistor M6 is in electric current I lower than a Vgs of the voltage at node 38 place
biasedunder a grid to source voltage).Voltage on node 74 is provided to the grid G of transistor M1 and sets the operating point of transistor M1.Because the voltage at node 72 place is a Vgs (M1's) higher than the voltage of node 74 and because the voltage on node 74 is a Vgs (M6's) lower than the voltage on node 38, so the source terminal S of transistor M1 (namely, the drain D 2 of node 72 and transistor M2) voltage follow the voltage at node 38 (that is, the drain D 1 of transistor SW) place haply.Because this bias current operates, the voltage in drain D 2 mates the voltage in drain D 1 substantially, thus contributes to guaranteeing current mirror operation accurately.
Because M2 and SW forms current mirror, so the electric current I in transistor M2
sensingwith the current in proportion of transistor SW.Electric current I
sensingflow through sense resistor R and produce voltage drop V on circuit 40
sensing.Control circuit 24 can have comparator, such as comparator 80.Comparator 80 can by the voltage V on input 82
sensingcompare with the reference voltage Vref on input 84, and reflection V can be produced on circuit 86
sensingbe higher than or lower than the corresponding binary output signal of Vref.Use the state of the signal on circuit 86, control circuit 24 can be asserted or be removed the control signal Vcnt asserted on circuit 42.
The value of the reverse current threshold value corresponded to desired by path 14 can be set as with reference to the value of voltage Vref.Such as, Vref can be set as the level of the electric current I value corresponding to-5mA.Higher than-5mA and lower than under the I value of 0, the magnitude of current flow in equipment 10 is minimum, equipment 10 is made to absorb reverse current I satisfactorily and damage can not be caused to its intraware.Higher than under the I value of 0, there is not inverse power supply situation and equipment 10 and annex 14 normally work.In both cases, control circuit 24 can assert Vcnt signal on circuit 42, to guarantee that transistor SW connects.When transistor SW connects, node 38 and 36 will be shorted together, and equipment 10 and equipment 14 can equipment 10 be that the pattern that equipment 14 is powered operates by path 12.
In order to contribute to guaranteeing performance accurately, adjustable reference voltage Vref.Such as, the value of Vref can be set as following value, this value is removed the internal blas of comparator and is guaranteed that control circuit is triggered in desired electric current I value (such as ,-5mA or other suitable level).
Output on circuit 86 will switch (reversion) back and forth when the threshold current value (in this example) of I value lower than-5mA.By removing, control circuit 24 will assert that control signal Vcnt correspondingly responds to turn off transistor SW.When turning off transistor SW, the inverse supply current flowing to equipment 12 from equipment 14 will be blocked, thus prevent from causing damage to the circuit of equipment 10.
By the accuracy using the transistor matched each other to improve the common grid amplifier formed by transistor M1 and M6.It is about 10 that transistor M2 and SW can have ratio (K value)
-2to 10
-4or the intensity of other suitable ratio (W/L value).Such as, transistor M2 can have the intensity of the about one thousandth intensity of transistor SW.
Biasing circuit for helping to detect inverse power supply situation can have the cascode amplifier for improving circuit bias.Fig. 4 illustrates how biasing circuit and electric current can form an exemplary circuit diagram of cascade layout to potential circuit 68.As shown in Figure 4, bias current I
biasedcircuit branch 102 and 104 (such as, transistor M8 and M9 can form the current mirror for circuit branch 102, and transistor M8 and M12 can form the current mirror for circuit branch 104) is mirrored to by transistor M8, M9 and M12.
Transistor M11 and M13 can be used as cascode transistors, its contribute to making current mirror transistor M9 and M12 from and the change that is associated of different drain voltage isolate.Such as, transistor M11 can contribute to transistor M9 is mated with the dram-source voltage of transistor M8, and this often makes operation and the electric current I of transistor M9
sensingchange isolation (such as, because make the dram-source voltage of the dram-source voltage of transistor M9 and grid-source voltage and transistor M8 and grid-source voltage mate).Transistor M3, M5, M4 and M7 can be used as cascade and arrange, it contributes to the voltage matches at the voltage at drain D 2 place making transistor M2 and drain D 1 place of transistor SW.
By the electric current I of transistor M2 from transistor SW mirror image
sensingtransistor M1 and M3 can be provided to.Electric current I
sensingelectric current I s2 and Is1 can be divided into.Electric current I s2 can be determined that by the magnitude of current being derived from current mirror transistor M12 (such as, electric current I s2 can equal I
biasedadd electric current I1).Electric current I s1 can reflect from I
sensingany residual current.Such as, (such as, I is greater than for being greater than electric current I s2
biased) I
sensingelectric current, electric current I s1 can reflect I
sensingand the current differential between Is2.And for example, (such as, I is less than for deficiency
biased) electric current I
sensing, indivisible electric current can flow through resistor R.Electric current I s1 can be routed by circuit branch 106 and be amplified to produce voltage V by resistor R
sensing.
Fig. 5 illustrates the voltage V produced by the circuit of Fig. 4
sensingthe exemplary diagram how to change with output current I (such as, being provided to the output current of accessory device).As shown in Figure 5, under output current Ia, V
sensingit can be zero volt.The value of Ia can reflect the difference between the bias current I1 of the circuit branch 102 and Is2 of circuit branch 104.Such as, make I1 equal Is2 if transistor M9 and M12 is matched to, so Ia can be minimum (such as, Ia can be the value between-2mA and 0mA, such as-1.5mA).In other words, electric current I is worked as
sensingequal electric current I s2 and there is no electric current through resistor R, V
sensingit can be zero volt.When equipment output current is greater than Ia, voltage V
sensingzero volt can be remained on.
Control circuit 24 can be configured in response to determining voltage V
sensingexceed threshold voltage Vb (such as, when the value of inverse supply current exceedes the value of current Ib) and disable transistor SW.Threshold voltage Vb can stand based on power regulator circuitry 18 ability that value is up to the inverse supply current of Ib value and select.
The biasing circuit 68 of Fig. 4 contributes to the voltage at drain D 1 place guaranteeing transistor SW and mates during inverse threshold condition of powering with the voltage at drain D 2 place of transistor M2.Under output current Ia (such as, minimum output current level), electric current I
sensingsubstantially the same with current IS 2, and the cascade mirror structure formed by transistor M1, M3, M4, M5, M6, M7, M11, M9, M13 and M12 contributes to guaranteeing that the voltage of the drain D 1 of transistor SW approximates the voltage at drain D 2 place of transistor M2.
By making the voltage matches at D1 and D2 place, biasing circuit 68 can contribute to the impact being protected from variations in temperature.Fig. 6 illustrates how to alleviate by biasing circuit 68 V be associated with variations in temperature
sensingthe exemplary diagram of change.As shown in Figure 6, lines 112 may correspond to the V in producing at the first temperature T1
sensing, lines 114 may correspond to the V in producing at the second temperature T2
sensing, lines 116 may correspond to the V in producing at the 3rd temperature T3
sensing.Under output current in window 118 around electric current I a, lines 112,114 and 116 can have minimum difference (such as, V
sensingmay be insensitive to the variations in temperature in window 118).
If needed, adjustable produces voltage V
sensingresiding threshold current Ia.Threshold current Ia is adjusted by the difference between the electric current I 1 of Circuit tuning branch 102 and the electric current I s2 of circuit branch 104.Such as, the W/L of transistor M9 can be adjusted relative to the breadth length ratio of transistor (W/L), to control the difference between electric current I 1 and electric current I s2.In order to increase electric current I s2, the W/L (such as, by increasing the W of transistor M12 or reducing the W of transistor M9) of transistor M12 can be increased relative to transistor M9.Fig. 7 illustrates the exemplary diagram that how can be controlled threshold current Ia by the size of adjustment current mirror transistor M9 and M12.
As shown in Figure 7, lines 122 may correspond in threshold current Ia.The threshold current of biasing circuit and current-voltage amplifier circuit 26 increases to threshold current Ia ' by the ratio reducing the W/L between transistor M12 and M9.Such as, the ratio of the W/L of transistor M12 can be reduced relative to the W/L of transistor M9.Under this situation, can be reduced with respect to the electric current I 1 of transistor M9 by the electric current I s2 of transistor M12, this is just provided to the magnitude of current of sense resistor R (such as any given output current I increase, for any given output current I, the sensed voltage of lines 126 can be greater than the sensed voltage of lines 122).Similarly, threshold current is decreased to Ia by the ratio of the W/L increasing W/L and the M9 of M12 ".
Fig. 8 is an exemplary diagram of control circuit 24, and control circuit 24 can be provided for the sensed voltage V in response to being produced by circuit 26
sensingand generate control signal Vcnt.As shown in Figure 8, control circuit 24 can comprise comparator 132 and 134, comparator 132 and 134 receiver voltage V
sensingand by V
sensingcompare with corresponding reference voltage Vref 1 and Vref2.Vref1 is suitable for the voltage detected with the large voltage be seriously associated against power supply situation (such as, to work as V
sensingc1 can be asserted) when being greater than Vref1.Vref2 can be that the voltage being suitable for the small voltage that detection is associated against power supply situation with appropriateness (such as, works as V
sensingc2 can be asserted) when being greater than Vref2.Such as, Vref1 can be at I by circuit 26
sensingfor the voltage sensed during about 200mA, and Vref2 can be at I by circuit 26
sensingfor the voltage sensed during about 5mA.This example is only exemplary.Vref1 and Vref2 can be any expectation voltage for detecting inverse power supply situation.
Testing circuit 136 can detect C2 when asserted continuously the time continuing to be longer than predetermined time threshold (such as, 10uS, 100uS or any threshold duration that other is expected) from comparator 134 Received signal strength C2.Such as, when the time continuing to be longer than 10uS has been asserted in the output of comparator 134 continuously, testing circuit 136 can assert the detection signal D1 being provided to control circuit 138.This example is only exemplary.Testing circuit 136 can be configured to the time threshold with any expectation.Such as, can stand to determine time threshold from the appropriateness of electronic equipment 14 against the ability of supply current amount based on the adjuster circuit 18 of equipment 10.
Testing circuit 136 can comprise the testing circuit based on numeral and/or simulation.Such as, testing circuit 136 can comprise the counter based on clock, the output of this counter detection comparator 134 by assert continuously through clock periodicity.Under this situation, testing circuit 136 can assert detection signal D1 in response to determining counter to reach predetermined value (such as counter threshold).This example is only exemplary.If needed, any expectation circuit how long has been asserted in the output that testing circuit 136 can comprise the testing circuit based on state machine, the testing circuit based on RC or detection comparator 134 continuously.
Fig. 9 is the exemplary diagram that the operation of control circuit 24 during inverse power supply situation is shown.As shown in Figure 9, equipment output current I initially may vibrate (such as, when supplying electric power by main frame 10 to annex 14, the power source path inductance be associated with path 16 and 17 may cause ringing).Initial ringing vibration can have enough values and carry out trigger comparator 134 during time T1 and T2, assert that signal C2 (such as, can produce the corresponding V that had value is greater than Vref2 during time T1 and T2
sensingvoltage).But testing circuit 136 can determine that the duration of time T1 and T2 is not enough, and detection signal D1 can keep being removed asserting.
During time T3, serious inverse power supply situation may occur, and wherein equipment 10 receives enough inverse power supplies and carrys out trigger comparator 132 (such as, electric current I can be produce for circuit 26 V being greater than Vref1
sensingvoltage is enough born).Under this situation, control circuit 138 can disable transistor SW with the impact (such as, by remove assert Vcnt) of proterctive equipment 10 from inverse power supply situation.
Figure 10 is the exemplary diagram that the operation of control circuit 24 during the inverse power supply situation of appropriateness is shown.As shown in Figure 10, equipment output current I can be stabilized to the negative current of appropriate value (such as after initial ringing vibration, after initial ringing vibration, the amount of inverse supply current can be enough to trigger comparator 134 during time period T5, assert signal C2, but can be not enough to trigger comparator 132).In the example of Figure 10, testing circuit 136 can assert detection signal D1 (such as, because signal C2 is asserted the time continuing to be longer than predetermined threshold value continuously) at the end of time period T5.Control circuit 138 can be removed in response to asserting of signal D1 and assert Vcnt.
Figure 11 illustrates that how control circuit 24 is can for the exemplary diagram by providing control signal Vs to control absorbing crystal pipe 202 to the grid of absorbing crystal pipe 202.Control signal Vs can based on the voltage V provided by current-voltage amplifier circuit 26
sensingdetermine.During inverse power supply situation, control circuit 24 can utilize control signal Vs to control the Absorption Current Is by transistor 202, will shift away against supply current from power regulator circuitry 18.
According to an embodiment, provide a kind of road radial attachment be configured to by comprising power circuit to provide the electronic equipment of electric power, this electronic equipment comprises: the power regulator circuitry providing supply voltage to power circuit; Be inserted in the first transistor in power circuit; Transistor seconds, the first transistor and transistor seconds form current mirror, and this current mirror produces the signal that the magnitude of current of the first transistor is flow through in instruction; And circuit, when the electric current that signal designation flows through the first transistor and wherein this electronic equipment are associated from the inverse power supply situation that this annex receives electric power, this circuit provides control signal to turn off the first transistor to the first transistor.
According to another embodiment, this circuit comprises the control circuit of the monitoring sensing voltage proportional with signal, voltage drop response on the first transistor in flow through the first transistor electric current given change and change the first amount, sensing voltage in response to flow through the first transistor electric current described given change and change the second amount, and the second amount is greater than the first amount.
According to another embodiment, this circuit comprises the current-voltage amplifier converting the signal into sensing voltage.
According to another embodiment, this current-voltage amplifier comprises the paired transistor coupling to be formed common grid amplifier.
According to another embodiment, this control circuit comprises the comparator 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 transistor seconds has the second source electrode, the second drain electrode and second grid, and this electronic equipment also comprises makes the second drain bias to mate the biasing circuit of the voltage in the first drain electrode.
According to another embodiment, this current mirror comprises the first line the first source electrode being coupled to the second source electrode, and comprises the second circuit first grid being coupled to second grid.
According to another embodiment, higher than given threshold value, the electric current that this circuit is configured in response to determining to flow through the first transistor asserts that control signal is to connect the first transistor, and this circuit is configured to remove lower than described given threshold value in response to the electric current determining to flow through transistor seconds assert that control signal is to turn off the first transistor.
According to another embodiment, this given threshold value has negative value, and this control circuit has the comparator with first input end and the second input, and this second input is configured to receive the reference voltage representing described threshold value.
According to another embodiment, this electronic equipment comprises and is selected from following equipment: cell phone, panel computer, portable computer and media player, this electronic equipment also comprises Storage and Processing circuit.
According to an embodiment, the protective circuit stoping the transmission electric power from external equipment to electronic equipment during inverse power supply situation in a kind of electronic equipment is provided, this protective circuit comprises: the first transistor being coupled to power supply input-output terminal, during at least some operation of this protective circuit, source current flows through the first transistor; Transistor seconds, transistor seconds is coupled to the first transistor to form current mirror, and this current mirror produces the current sensor proportional with the source current flowing through the first transistor; And to the circuit that current sensor responds, during inverse power supply situation, this circuit provides the control signal turning off the first transistor.
According to another embodiment, this circuit comprises current-voltage amplifier current sensor being converted to sensing voltage.
According to another embodiment, this circuit comprises monitoring sensing voltage and provides the control circuit of control signal based on sensing voltage.
According to another embodiment, this control circuit comprises comparator, and this comparator has the first input end receiving sensing voltage and the second input receiving reference voltage.
According to another embodiment, this circuit comprises biasing circuit, and described biasing circuit makes the drain voltage in transistor seconds be biased to mate the drain voltage of the first transistor.
According to another embodiment, this biasing circuit comprises current source.
According to an embodiment, provide a kind of electronic equipment, this electronic equipment comprises: the first input-output terminal; Second input-output terminal; Be coupled to the earthing power supply circuit of the second input-output terminal; Be coupled to the positive supply circuit of the first input-output terminal; Be coupled to the first transistor of positive supply circuit; Be coupled to the first transistor to form the transistor seconds of current mirror, this current mirror produces the current sensor with the current in proportion flowing through the first transistor and positive supply circuit; And current sensor is converted to the current-voltage amplifier circuit of sensing voltage.
According to another embodiment, this current-voltage amplifier comprises the resistor that current sensor flows through.
According to another embodiment, this electronic equipment comprises control circuit, and this control circuit receives sensing voltage and produces the corresponding control signal controlling the first transistor.
According to another embodiment, this control circuit comprises comparator, this comparator has the first input end receiving sensing voltage and the second input receiving reference voltage, and this electronic equipment also comprises holding wire, and control signal is provided to the grid of the first transistor by this holding wire.
According to an embodiment, provide a kind of electronic equipment, this electronic equipment comprises: power supply terminal; Can be used to the power regulator circuitry by power supply terminal external device supply electric power; Be coupled to the protective circuit of power supply terminal; this protective circuit is configured to detect inverse power supply situation; in inverse power supply situation; this electronic equipment is at power supply terminal place received current, and this protective circuit is further configured to and in response to inverse power supply situation being detected, power regulator circuitry is disconnected with power supply terminal to be electrically connected.
According to an embodiment, provide a kind of road radial attachment be configured to by comprising power circuit to provide the electronic equipment of electric power, this electronic equipment comprises: the power regulator circuitry providing supply voltage to power circuit; Be inserted in the first transistor in power circuit; Transistor seconds, the first transistor and transistor seconds form current mirror, and this current mirror produces the signal that the magnitude of current of the first transistor is flow through in instruction; Be coupled to the biasing circuit of the first transistor and transistor seconds, this biasing circuit is provided for the current offset of transistor seconds, and this biasing circuit comprises the other current mirror formed by least one cascode transistors; And control circuit, the signal that this control circuit can be used to based on being produced by current mirror controls the first transistor.
According to another embodiment, this biasing circuit comprises the first branch and the second branch, and the Part I for the current offset of transistor seconds flows through the first branch, and the Part II of current offset flows through the second branch.
According to another embodiment, this first branch comprises resistor, and signal is produced by the voltage drop be associated with the Part I of current offset on resistor.
According to another embodiment, other current mirror comprises the 4th transistor of third transistor and mirror image third transistor, and cascode transistors is coupled to the 4th transistor.
According to another embodiment, this current mirror comprises the first current mirror, this other current mirror comprises the second current mirror, the 5th transistor that the Part II that first branch comprises current offset flows through, 5th transistor AND gate third transistor forms the 3rd current mirror, and the breadth length ratio that the 5th transistor of the 3rd current mirror has is different from the breadth length ratio of the 4th transistor of the second current mirror.
According to an embodiment, provide a kind of electronic equipment, this electronic equipment comprises: power supply terminal; Can be used to the power regulator circuitry by power supply terminal external device supply electric power; And be coupled to the protective circuit of power supply terminal; this protective circuit is configured to detect inverse power supply situation; in inverse power supply situation; this electronic equipment is continued above the continuous time of threshold value at power supply terminal place received current, and this protective circuit is further configured to and in response to inverse power supply situation being detected, power regulator circuitry is disconnected with power supply terminal to be electrically connected.
According to another embodiment, this protective circuit comprises: current mirror, and this current mirror produces the signal of the magnitude of current that this electronic equipment of instruction receives at power supply terminal place; First comparator, this signal and the first reference voltage compare to produce the first control signal by this first comparator; And second comparator, this signal and the second reference voltage compare to produce the second control signal by this second comparator, and this first reference voltage is greater than this second reference voltage.
According to another embodiment, this protective circuit also comprises reception second control signal and produces the testing circuit of detection signal, and this detection signal identifies the second control signal and when asserted continuously the time being continued above this threshold value.
According to another embodiment, this electronic equipment comprises the control circuit of reception first control signal and detection signal, and this control circuit is configured to make in response to the first asserting of control signal power regulator circuitry disconnect with power supply terminal and is electrically connected.
According to another embodiment, this testing circuit is configured to asserted continuously time of being continued above this threshold value and assert detection signal in response to mark second control signal, and this control circuit is further configured to and in response to asserting of detection signal, power regulator circuitry is disconnected with power supply terminal to be electrically connected.
The above is only that principle of the present invention is described, and when not departing from the scope of the invention and spirit, those skilled in the art can make various amendment.Above-described embodiment can be implemented separately or can combination in any implement.
Claims (31)
1. the road radial attachment be configured to by comprising power circuit provides an electronic equipment for electric power, and described electronic equipment comprises:
Power regulator circuitry, described power regulator circuitry provides supply voltage to described power circuit;
The first transistor, described the first transistor is inserted in described power circuit;
Transistor seconds, wherein said the first transistor and described transistor seconds form current mirror, and described current mirror produces instruction has how many electric currents just flowing through the signal of described the first transistor; With
Circuit, when the described electric current that described signal designation flows through described the first transistor is associated with inverse power supply situation, described circuit provides control signal to turn off described the first transistor to described the first transistor, wherein under described inverse power supply situation, described electronic equipment receives electric power from described annex.
2. electronic equipment according to claim 1, wherein said circuit comprises the control circuit of the monitoring sensing voltage proportional with described signal, wherein in response to the given change of described electric current flowing through described the first transistor, voltage drop on described the first transistor changes the first amount, wherein in response to the described given change of described electric current flowing through described the first transistor, described sensing voltage changes the second amount, and wherein said second amount is greater than described first amount.
3. electronic equipment according to claim 2, wherein said circuit comprises the current-voltage amplifier described signal being converted to described sensing voltage.
4. electronic equipment according to claim 3, wherein said current-voltage amplifier comprises the paired transistor coupling to be formed common grid amplifier.
5. electronic equipment according to claim 4, wherein said control circuit comprises the comparator receiving described sensing voltage and reference voltage.
6. electronic equipment according to claim 1, wherein said the first transistor has the first source electrode, the first drain electrode and first grid, and wherein said transistor seconds has the second source electrode, the second drain electrode and second grid, described electronic equipment also comprises biasing circuit, and described biasing circuit makes described second drain bias to mate the voltage in described first drain electrode.
7. electronic equipment according to claim 6, wherein said current mirror comprises the first line described first source electrode being coupled to described second source electrode, and comprises the second circuit described first grid being coupled to described second grid.
8. electronic equipment according to claim 1, wherein said circuit is configured in response to determining higher than given threshold value, the described electric current flowing through described the first transistor asserts that described control signal is to connect described the first transistor, and wherein said circuit is configured to remove lower than described given threshold value in response to the described electric current determining to flow through described transistor seconds assert that described control signal is to turn off described the first transistor.
9. electronic equipment according to claim 8, wherein said given threshold value has negative value, wherein said control circuit has the comparator with first input end and the second input, and wherein said second input is configured to receive the reference voltage representing described threshold value.
10. electronic equipment according to claim 1, wherein said electronic equipment comprises and is selected from following equipment: cell phone, panel computer, portable computer and media player, described electronic equipment also comprises Storage and Processing circuit.
The protective circuit stoped during inverse power supply situation from external equipment to described electronic equipment transmission electric power in 11. 1 kinds of electronic equipments, described protective circuit comprises:
The first transistor, described the first transistor is coupled to power supply input-output terminal, and wherein during at least some operation of described protective circuit, source current flows through described the first transistor;
Transistor seconds, described transistor seconds is coupled to described the first transistor to form current mirror, and wherein said current mirror produces the current sensor proportional with the described source current flowing through described the first transistor; With
Circuit, described circuit responds described current sensor, and during described inverse power supply situation, described circuit provides the control signal turning off described the first transistor.
12. protective circuits according to claim 11, wherein said circuit comprises the current-voltage amplifier described current sensor being converted to sensing voltage.
13. protective circuits according to claim 12, wherein said circuit comprises the described sensing voltage of monitoring and provides the control circuit of described control signal based on described sensing voltage.
14. protective circuits according to claim 13, wherein said control circuit comprises comparator, and described comparator has the first input end receiving described sensing voltage and the second input receiving reference voltage.
15. protective circuits according to claim 11, wherein said circuit comprises biasing circuit, and described biasing circuit makes the drain voltage in described transistor seconds be biased to mate the drain voltage of described the first transistor.
16. protective circuits according to claim 15, wherein said biasing circuit comprises current source.
17. 1 kinds of electronic equipments, comprising:
First input-output terminal;
Second input-output terminal;
Earthing power supply circuit, described earthing power supply circuit is coupled to described second input-output terminal;
Positive supply circuit, described positive supply circuit is coupled to described first input-output terminal;
The first transistor, described the first transistor is coupled to described positive supply circuit;
Transistor seconds, described transistor seconds is coupled to described the first transistor to form current mirror, and wherein said current mirror produces the current sensor with the current in proportion flowing through described the first transistor and described positive supply circuit; With
Current-voltage amplifier circuit, described current-voltage amplifier circuit converts described current sensor to sensing voltage.
18. electronic equipments according to claim 17, wherein said current-voltage amplifier comprises the resistor that described current sensor flows through.
19. electronic equipments according to claim 18, also comprise control circuit, and described control circuit receives described sensing voltage and produces the corresponding control signal controlling described the first transistor.
20. electronic equipments according to claim 19, wherein said control circuit comprises comparator, described comparator has the first input end receiving described sensing voltage and the second input receiving reference voltage, described electronic equipment also comprises holding wire, and wherein said control signal is provided to the grid of described the first transistor by described holding wire.
21. 1 kinds of electronic equipments, comprising:
Power supply terminal;
Power regulator circuitry, described power regulator circuitry can be used to by described power supply terminal external device supply electric power;
Protective circuit; described protective circuit is coupled to described power supply terminal; wherein said protective circuit is configured to detect inverse power supply situation; wherein under described inverse power supply situation; described electronic equipment is at described power supply terminal place received current, and wherein said protective circuit is further configured to and in response to described inverse power supply situation being detected, described power regulator circuitry is disconnected with described power supply terminal to be electrically connected.
22. 1 kinds of road radial attachment be configured to by comprising power circuit provide the electronic equipment of electric power, and described electronic equipment comprises:
Power regulator circuitry, described power regulator circuitry provides supply voltage to described power circuit;
The first transistor, described the first transistor is inserted in described power circuit;
Transistor seconds, wherein said the first transistor and described transistor seconds form current mirror, and described current mirror produces instruction has how many electric currents just flowing through the signal of described the first transistor;
Biasing circuit, described biasing circuit is coupled to described the first transistor and described transistor seconds, described biasing circuit is provided for the current offset of described transistor seconds, and wherein said biasing circuit comprises the other current mirror formed by least one cascode transistors; With
Control circuit, the described signal that described control circuit can be used to based on being produced by described current mirror controls described the first transistor.
23. electronic equipments according to claim 22, wherein said biasing circuit comprises the first branch and the second branch, Part I wherein for the described current offset of described transistor seconds flows through described first branch, and the Part II of described current offset flows through described second branch.
24. electronic equipments according to claim 23, wherein said first branch comprises resistor, and wherein said signal is produced by the voltage drop be associated with the described Part I of described current offset on described resistor.
25. electronic equipments according to claim 23, wherein other current mirror comprises the 4th transistor of third transistor described in third transistor and mirror image, and wherein said cascode transistors is coupled to described 4th transistor.
26. electronic equipments according to claim 25, wherein said current mirror comprises the first current mirror, wherein said other current mirror comprises the second current mirror, the 5th transistor that the described Part II that wherein said first branch comprises described current offset flows through, third transistor described in wherein said 5th transistor AND gate forms the 3rd current mirror, and the breadth length ratio that described 5th transistor of wherein said 3rd current mirror has is different from the breadth length ratio of described 4th transistor of described second current mirror.
27. 1 kinds of electronic equipments, comprising:
Power supply terminal;
Power regulator circuitry, described power regulator circuitry can be used to by described power supply terminal external device supply electric power; With
Protective circuit; described protective circuit is coupled to described power supply terminal; wherein said protective circuit is configured to detect inverse power supply situation; wherein under described inverse power supply situation; described electronic equipment is continued above the continuous time of threshold value at described power supply terminal place received current, and wherein said protective circuit is further configured to and in response to described inverse power supply situation being detected, described power regulator circuitry is disconnected with described power supply terminal to be electrically connected.
28. electronic equipments according to claim 27, wherein said protective circuit comprises:
Current mirror, described current mirror produces the described electronic equipment of instruction receives how many electric currents signal at described power supply terminal place;
First comparator, described signal and the first reference voltage compare to produce the first control signal by described first comparator; With
Second comparator, described signal and the second reference voltage compare to produce the second control signal by described second comparator, and wherein said first reference voltage is greater than described second reference voltage.
29. electronic equipments according to claim 28, wherein said protective circuit also comprises:
Testing circuit, described testing circuit receives described second control signal and produces detection signal, and when described second control signal of described detection signal mark is asserted the time being continued above described threshold value continuously.
30. electronic equipments according to claim 29, also comprise:
Control circuit, described control circuit receives described first control signal and described detection signal, and wherein said control circuit is configured to make in response to described first asserting of control signal described power regulator circuitry disconnect with described power supply terminal and is electrically connected.
31. electronic equipments according to claim 30, wherein said testing circuit is configured to asserted continuously time of being continued above described threshold value and assert described detection signal in response to described second control signal of mark, and wherein said control circuit is further configured to and in response to described asserting of detection signal, described power regulator circuitry is disconnected with described power supply terminal to be electrically connected.
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 true CN104335437A (en) | 2015-02-04 |
| CN104335437B CN104335437B (en) | 2017-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710687212.5A Active CN107390768B (en) | 2012-06-15 | 2013-06-03 | Power protection circuit for electronic equipment |
| CN201380027991.6A Active CN104335437B (en) | 2012-06-15 | 2013-06-03 | Electronic equipment electric power protection circuit |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710687212.5A Active CN107390768B (en) | 2012-06-15 | 2013-06-03 | Power protection circuit for electronic equipment |
Country Status (3)
| Country | Link |
|---|---|
| KR (2) | KR20150004886A (en) |
| CN (2) | CN107390768B (en) |
| WO (1) | WO2013188155A1 (en) |
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| 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 |
| CN108880528A (en) * | 2017-05-08 | 2018-11-23 | 联发科技股份有限公司 | The interface circuit of electronic device |
| CN110460015A (en) * | 2018-05-08 | 2019-11-15 | 半导体组件工业公司 | Overvoltage crowbar, USB connector and the over-voltage protection method for USB connector |
| CN110994547A (en) * | 2015-09-21 | 2020-04-10 | 西普托特技术有限责任公司 | Single transistor device and method for protecting a circuit |
| CN113533829A (en) * | 2021-09-15 | 2021-10-22 | 武汉市聚芯微电子有限责任公司 | Current detection circuit and method |
| CN114489217A (en) * | 2020-11-11 | 2022-05-13 | 扬智科技股份有限公司 | Signal receiving device and bias correction circuit thereof |
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| US10027107B2 (en) | 2016-04-05 | 2018-07-17 | Apple Inc. | Electronic device with reverse voltage protection circuitry for multiple control lines |
| 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 |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20170038126A (en) | 2017-04-05 |
| CN104335437B (en) | 2017-08-01 |
| KR20150004886A (en) | 2015-01-13 |
| WO2013188155A1 (en) | 2013-12-19 |
| CN107390768A (en) | 2017-11-24 |
| CN107390768B (en) | 2020-03-10 |
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