CN109546999A - A kind of programmable USB current limiting switch - Google Patents
A kind of programmable USB current limiting switch Download PDFInfo
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- CN109546999A CN109546999A CN201811435638.2A CN201811435638A CN109546999A CN 109546999 A CN109546999 A CN 109546999A CN 201811435638 A CN201811435638 A CN 201811435638A CN 109546999 A CN109546999 A CN 109546999A
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- current
- triode
- amplifier
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/04—Modifications for accelerating switching
- H03K17/0406—Modifications for accelerating switching in composite switches
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
- G06F13/4081—Live connection to bus, e.g. hot-plugging
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
Abstract
The present invention relates to a kind of programmable USB current limiting switches, it include: that the positive input of reproducible amplifier is connected to the drain electrode of output power pipe Mp1, negative input is connected to the drain electrode of output current sample pipe Mp2 and the source electrode of current sample pipe Mp3, the source electrode of current sample pipe Mp3 connects the output end of reproducible amplifier, reproducible amplifier out is returned to by the grid of current sample pipe Mp3, constitutes a circuit；The drain electrode of current sample pipe Mp3 is connected to the positive input of current limit amplifier, and the output of current limit amplifier is connected respectively to output power pipe Mp1 and exports the grid of current sample pipe Mp2, constitutes another circuit；One input terminal of the output end access logic sum gate of current limit amplifier, the grid of the output end connection open-drain output pipe Mn3 of logic sum gate, controls open-drain efferent duct Mn3.Fast response time of the present invention, conducting resistance is small, Reflector output and long service life.
Description
Technical field
The present invention relates to USB power source management domain, specifically a kind of programmable USB current limiting switch.
Background technique
With the high speed development and application extension of computer and various electronic equipments, USB is as a kind of connection and transmits number
According to tool, promoted USB technology using very extensive, therefore the various performances of USB are also got growing concern for.By
In the performance of USB plug and play, having warm connection function is one of technical characteristics of USB system, carries out hair when hot plug
Raw instantaneous short circuit or be connected to compromised devices and generate high current when, it is necessary to usb hub and host apparatus are carried out effective
Protection.Therefore, in USB power source management aspect, power protection switch needs to have current detecting and multi-protective function.
In recent years, there are many companies to propose one value of selection in two cut-off currents, answers on different devices in this way
Used time just has very big limitation.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of programmable USB current limiting switch, when circuit system goes wrong
When, can timely release guard signal, close system, improve the stability of circuit system.
Present invention technical solution used for the above purpose is:
A kind of programmable USB current limiting switch, comprising:
The positive input of reproducible amplifier is connected to the drain electrode of output power pipe Mp1, and negative input is connected to defeated
The source electrode of the source electrode of the drain electrode of current sample pipe Mp2 and current sample pipe Mp3 out, current sample pipe Mp3 connects reproducible amplification
The output end of device returns to reproducible amplifier out by the grid of current sample pipe Mp3, constitutes a circuit；
The drain electrode of current sample pipe Mp3 is connected to the positive input of current limit amplifier, and current limit amplifier is defeated
It is connected respectively to output power pipe Mp1 out and exports the grid of current sample pipe Mp2, constitutes another circuit；
One input terminal of the output end access logic sum gate of current limit amplifier, the output end connection of logic sum gate are opened
The grid for leaking efferent duct Mn3, controls open-drain efferent duct Mn3.
The reproducible amplifier includes:
Collapsible amplifier architecture using common base as amplifier input stage, the source electrode connection the of the first NMOS tube N1
Two resistance R1 make the second NMOS tube N2, third NMOS tube N3, the 4th NMOS tube N4 duplication first to ground, using current-mirror structure
Electric current in NMOS tube N1, the source electrode of the second NMOS tube N2 connect second resistance R2 to ground, the drain electrode connection of the second NMOS tube N2
It is separately connected a resistance RIN to the 0th triode Q0, the 0th triode Q0, the first triode Q1, the second triode Q2, is utilized
Current-mirror structure makes the first triode Q1, the second triode Q2 replicate the electric current in the 0th triode Q0, the first triode Q1, the
Two triode Q2 connect composition accordion structure, third NMOS tube N3, the 4th with third NMOS tube N3, the 4th NMOS tube N4 respectively
NMOS tube N4 is separately connected 3rd resistor R3, the 4th resistance R4 and forms electric current to ground, the first PMOS tube P1 and the second PMOS tube P2
The drain electrode of mirror structure, the second PMOS tube P2 and the 4th NMOS tube N4 is connected, as output.
The current limit amplifier includes:
Collapsible amplifier architecture using common source as amplifier input stage, third triode Q3 and the 4th triode
Q4, third PMOS tube P3 and the 4th PMOS tube P4 separately constitute current-mirror structure, the 5th resistance R5 of the 4th PMOS tube P4 connection,
Six resistance R6 are connected to the base stage of the 5th triode Q5, the 6th triode Q6, the 5th triode Q5, the 6th as output, output
The number ratio of triode Q6 is 8: 1, and the base stage of the 5th triode Q5 passes through resistance R simultaneouslysetTo ground；The hair of 5th triode Q5
Emitter-base bandgap grading passes through the tenth resistance R10 to ground, the 5th triode by the 9th resistance R9, the tenth resistance R10 to ground, the 6th triode Q6
Q5, the 6th triode Q6 pass through respectively the 7th resistance R7, the 8th resistance R8 and with the 8th PMOS tube P8, the 7th PMOS tube P7 group
At accordion structure, the 5th PMOS tube P5 and the 6th PMOS tube P6 provide electric current, the 5th PMOS tube P5 and the 6th PMOS for two-way
The drain electrode of pipe P6 is separately connected the source electrode of the 8th PMOS tube P8, the 7th PMOS tube P7, and the 8th PMOS tube P8, the 7th PMOS tube P7 divide
It is not connect with the drain electrode of the 6th NMOS tube N6 and the 5th NMOS tube N5, the drain electrode that the 7th PMOS tube P7 and the 5th NMOS tube N5 are connected
As output, for controlling the output power pipe MP1 and output current sample pipe MP2.
The output power pipe Mp1 and current sample pipe Mp2 are the identical field-effect tube of size, and number ratio is 1080
∶1。
Further include thermal-shutdown circuit, is connect with control circuit and with door.
Further include under-voltage protecting circuit, is connect with control circuit and with door.
The invention has the following beneficial effects and advantage:
Fast response time of the present invention, conducting resistance is small, Reflector output and long service life.
Detailed description of the invention
Fig. 1 is circuit structure block diagram；
Fig. 2 is reproducible amplifier circuit figure；
Fig. 3 is current limit amplifier circuit figure；
Fig. 4 is chip typical application circuit figure；
Fig. 5 is reference voltage simulation result schematic diagram.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and embodiments.
To make above-mentioned purpose of the invention, feature and a little can be more obvious and easy to understand, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair
It is bright.But the present invention can be implemented in many other ways than those described herein, and those skilled in the art can not disobey
Similar improvement is done in the case where back invention intension, therefore the present invention is not limited to the specific embodiments disclosed below.
It should be noted that be referred to as " being set to " another element when element, it may directly on the other element,
Or there may also be elements placed in the middle.When an element is known as " connection " another element, it be can be directly connected to separately
One element may be simultaneously present centering elements.It is used herein to belong to "front", "rear", "left", "right" and similar
Bidding documents for illustrative purposes only, be not offered as unique embodiment.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.It is specific that description is intended merely in the term used in the description of invention herein
Embodiment purpose, it is not intended that in limitation the present invention.
It is circuit structure block diagram as shown in Figure 1.
Chip is by output p-type power tube, current sample pipe, reproducible amplifier, current limit amplifier, overheat protector electricity
Road, under-voltage protecting circuit, indicating fault output endIt is formed with parts such as logic control circuits.
The positive input of reproducible amplifier is connected to the drain electrode of output power pipe Mp1, and negative input is connected to defeated
The source electrode of the source electrode of the drain electrode of current sample pipe Mp2 and current sample pipe Mp3 out, current sample pipe Mp3 connects reproducible amplification
The output end of device returns to reproducible amplifier out by the grid of current sample pipe Mp3, constitutes a circuit；Electric current is adopted
The drain electrode of sample pipe Mp3 is connected to the positive input of current limit amplifier, and the output of current limit amplifier is connected respectively to defeated
The grid of power tube Mp1 and output current sample pipe Mp2 out, constitutes another circuit；The output of current limit amplifier terminates
Enter an input terminal of logic sum gate, the grid of the output end connection open-drain output pipe Mn3 of logic sum gate, to open-drain efferent duct
Mn3 is controlled.
Thermal-shutdown circuit, under-voltage protecting circuit and logic control circuit can realize with custom circuit, output power pipe Mp1
It is identical as current sample pipe Mp2 size, ratio 1080: 1.The positive input of reproducible amplifier is connected to the drain electrode of Mp1,
Negative input is connected to drain electrode and the source electrode of Mp3 of Mp2, and returns to reproducible amplifier out, structure by the grid of Mp3
At a circuit, the positive input of current limit amplifier, the output point of current limit amplifier are connected to by the drain electrode of Mp3
It is not connected to the grid of Mp1 and Mp2, constitutes another circuit.Its input for exporting also connection or door is to control open-drain
Efferent duct Mn3.
RSETResistance can set current limit threshold point, when current-limiting circuit works, what reproducible amplifier and Mp3 pipe were constituted
Negative-feedback can make A, B two o'clock voltage equal, and guarantee the electric current exact mirror image on Mp2 and Mp1, at this point, flowing through Mp2 and RSET
Electric current (the I of resistanceSET) it is the 1/1080 of Mp1 electric current, the electric current for flowing through Mp1 is the current threshold point (I of settingLIMIT), it derives public
Formula is as follows:
ISET=ILIMIT/1080 (1)
RSET=1.24V/ISET=1.34 × 103/ILIMT (2)
1.24V in formula (2) is the generation of benchmark potential circuit, is learnt by (2) formula, can be by adjusting RSETResistance value is come
Set the current threshold point I of the circuitLIMIT, realize programmable current limitation.Pass through RSETResistance can set current limit threshold point, when
When current-limiting circuit works, the negative-feedback that reproducible amplifier and metal-oxide-semiconductor are constituted can guarantee two, reproducible amplifier inputs
Hold voltage equal.
When there is overcurrent or short circuit, A point voltage is lower than B point voltage, and reproducible amplifier operation is in inelastic region at this time,
The feedback loop being made of current limit amplifier, current sample pipe Mp2 and Mp3 guarantees that the end SET voltage is 1.24V, at this time
The electric current for flowing through sampling pipe Mp2 pipe is 1.24V/ISET, the threshold current of setting will be maintained to export by mirror image.
When current threshold point of the load current much smaller than setting, VSETValue is less than 1.24V, at this time current limit amplifier
Inelastic region is worked in, exports and fully opens Mp1 pipe for low level, makes its work in linear zone, while reducing its electric conduction
Resistance, at this time without Current limited Control.
When USB further interface takes electricity and overall current is caused to be more than predetermined current, it can reduce excessive electric current and incite somebody to action
Output electric current maintains the current value of setting, and can meet the company of the 100mA to 500mA of self-powered usb hub output
Continuous electric current.This circuit can realize 100mA to 500mA other than it can satisfy usb bus to the strict control of load current
Current threshold point programmable, precision can reach 10%.
The chip functions can be made up of the current sample pipe of reproducible amplifier, current limit amplifier and its control
Loop realize.According to the load condition of chip, chip loop needs are adjusted accordingly.According to load condition, circuit
Working condition can be divided into underloading, load does not reach given threshold, load be setting value nearby, load be more than setting value and short
This five kinds of working conditions of road, under this five kinds of working conditions, loop work is in different adjustment states, and it is dynamic to need to meet load
When state changes, the stabilization of loop adjustment.
The realization of the chip functions passes through the current sample pipe structure of reproducible amplifier, current limit amplifier and its control
At loop realize.According to the load condition of chip, chip loop needs are adjusted accordingly, according to load condition, circuit
Working condition can be divided into underloading, load do not reach given threshold, load be setting value nearby, load be more than setting value and
This short-circuit five kinds of working conditions.
It is illustrated in figure 2 reproducible amplifier circuit figure.
Collapsible amplifier architecture using common base as amplifier input stage, the source electrode connection the of the first NMOS tube N1
Two resistance R1 make the second NMOS tube N2, third NMOS tube N3, the 4th NMOS tube N4 duplication first to ground, using current-mirror structure
Electric current in NMOS tube N1, the source electrode of the second NMOS tube N2 connect second resistance R2 to ground, the drain electrode connection of the second NMOS tube N2
It is separately connected a resistance RIN to the 0th triode Q0, the 0th triode Q0, the first triode Q1, the second triode Q2, is utilized
Current-mirror structure makes the first triode Q1, the second triode Q2 replicate the electric current in the 0th triode Q0, the first triode Q1, the
Two triode Q2 connect composition accordion structure, third NMOS tube N3, the 4th with third NMOS tube N3, the 4th NMOS tube N4 respectively
NMOS tube N4 is separately connected 3rd resistor R3, the 4th resistance R4 and forms electric current to ground, the first PMOS tube P1 and the second PMOS tube P2
The drain electrode of mirror structure, the second PMOS tube P2 and the 4th NMOS tube N4 is connected, as output.
When circuit works normally, as high side current limiter, using common base as the collapsible of amplifier input stage
The both end voltage of amplifier architecture, reproducible amplifier is close or equal to input supply voltage VIN.Common base structure amplifier
Input stage does not have to VINIt directly biases, it is thus possible to get rid of control of the common mode input by supply voltage, work as A, B both end voltage
Circuit still can work normally when close even higher than supply voltage.When loop is established, A point voltage is equal with B point voltage,
N2 provides bias current for input stage, and input stage quiescent bias point is about VBEThe sum of with the overdrive voltage of N2 pipe, realizes and turn
The purpose of high common mode input is moved, differential signal is further amplified by N3 and N4, and differential signal is converted to single-ended signal
By VOUTEnd output.C point voltage value are as follows:
VC=VCM-IINRIN-VBE_Q0 (3)
V in above formulaCMFor the input common mode electrical level for inputting the port A and B, IINIt is solid for one for the bias current that N1 and N2 is generated
Constant current, C point voltage generate variation with the variation of common-mode voltage, and the highest common mode electrical level of circuit is by 2IINR4+VCEO_Q0+
IINRIN, 2IINR5+VCEO_Q0+IINRINAnd IINR4+VDS_n2+VBE_Q0+IINRINMinimum value determine, flow technique of the present invention be China
Rainbow 0.35um BCD technique, common-mode voltage value can be considerably beyond operating supply voltages.The Q1 of the differential input stage of the amplifier
Mutual conductance with Q2 is
gm=IBIAS/VTP (4)
V in above formulaTPFor the thermoelectrical potential of PNP pipe, by RINInfluence to input signal is added, the mutual conductance G of input stagemIt can indicate
Are as follows:
Gm=1/ (RIN+1/gmp) (5)
Through formula (4) and (5) it can be seen that when C point voltage change, since input bias current does not change, input
Mutual conductance remains unchanged in common mode range, and then can guarantee that amplifier gain is not influenced by common-mode voltage variation.
It is illustrated in figure 3 current limit amplifier circuit figure.
Collapsible amplifier architecture using common source as amplifier input stage, third triode Q3 and the 4th triode
Q4, third PMOS tube P3 and the 4th PMOS tube P4 separately constitute current-mirror structure, the 5th resistance R5 of the 4th PMOS tube P4 connection,
Six resistance R6 are connected to the base stage of the 5th triode Q5, the 6th triode Q6, the 5th triode Q5, the 6th as output, output
The number ratio of triode Q6 is 8: 1, and the base stage of the 5th triode Q5 passes through resistance R simultaneouslysetTo ground；The hair of 5th triode Q5
Emitter-base bandgap grading passes through the tenth resistance R10 to ground, the 5th triode by the 9th resistance R9, the tenth resistance R10 to ground, the 6th triode Q6
Q5, the 6th triode Q6 pass through respectively the 7th resistance R7, the 8th resistance R8 and with the 8th PMOS tube P8, the 7th PMOS tube P7 group
At accordion structure, the 5th PMOS tube P5 and the 6th PMOS tube P6 provide electric current, the 5th PMOS tube P5 and the 6th PMOS for two-way
The drain electrode of pipe P6 is separately connected the source electrode of the 8th PMOS tube P8, the 7th PMOS tube P7, and the 8th PMOS tube P8, the 7th PMOS tube P7 divide
It is not connect with the drain electrode of the 6th NMOS tube N6 and the 5th NMOS tube N5, the drain electrode that the 7th PMOS tube P7 and the 5th NMOS tube N5 are connected
As output, for controlling the output power pipe MP1 and output current sample pipe MP2.
Current limit amplifier input stage differential device is Q3 and Q4, and when load current reaches setting current-limiting points, loop is built
It is vertical to stablize, I1=I2, V at this timeSETEnd is low-temperature coefficient reference voltage:
Δ VBE=VTln8 (7)
When there is overcurrent, VSETVoltage is flowed through RSETCurrent control, with the rising V of sample rate currentSETVoltage rises,
I at this time1>I2, feedback control is carried out by output current sample pipe, by VSETReference voltage is maintained, output electric current is then flowed through
The electric current of sampling pipe are as follows:
Channel modulation effect, the output electric current of output power pipe are not considered are as follows:
K is output power pipe and sampling pipe ratio in above formula.
In addition, in order to guarantee the low on-resistance performance of device in normal work, output power pipe works in linear zone
When conducting resistance need through reasonable settings that breadth length ratio is realized, set its conducting resistance representative value as 70m Ω or so, count
It calculates shown in formula such as formula (10):
It is illustrated in figure 4 chip typical application circuit figure.
In USB hot plug process, many USB functions all show bulky capacitor characteristic, can receive very big electric current, big
Small can be more than to standardize defined limiting value, this will lead to device and is in current limliting working condition in a very short period of time, if by this
One reports the failure to controller, and the escape of disruptive will be caused to act.Increase a Reflector and sends delay, so that it may to prevent
Only these times it is extremely short event triggering Reflector transmission.
Programmable current limit switch of the invention emulates under 0.35 μm of BCD technique of NEC and carries out flow test.
Gain variation range of the invention is 59dB to 84dB, and phase margin is 83Deg to 86Deg, can satisfy circuit
Performance requirement.
It is illustrated in figure 5 reference voltage simulation result schematic diagram.
By reference voltage emulation it can be found that reference voltage is under full corner simulation scenarios, absolute value is become by 1.221V
Change to 1.240V, reference voltage is 1.232V in a typical case, can satisfy the required precision of current limiter, passes through after circuit flow
Test, function and population parameter have been all satisfied design requirement, have reached desired effect.
Chip operating voltage is 2.7V~5.5V, and may be programmed current-limiting zone is 100mA to 500mA, conducting resistance representative value
For 70m Ω, chip interior is furnished with overheat protector, under-voltage protection and short-circuit protection function, when circuit system when something goes wrong, can
Timely release guard signal closes system, improves the stability of circuit system.This circuit has fast response time, conducting resistance
The advantages that output of small, Reflector, long service life, be ideal USB overflow protecting element.
Claims (6)
1. a kind of programmable USB current limiting switch characterized by comprising
The positive input of reproducible amplifier is connected to the drain electrode of output power pipe Mp1, and negative input is connected to output electricity
The drain electrode of sampling pipe Mp2 and the source electrode of current sample pipe Mp3 are flowed, the source electrode of current sample pipe Mp3 connects reproducible amplifier
Output end returns to reproducible amplifier out by the grid of current sample pipe Mp3, constitutes a circuit；
The drain electrode of current sample pipe Mp3 is connected to the positive input of current limit amplifier, the output point of current limit amplifier
It is not connected to output power pipe Mp1 and exports the grid of current sample pipe Mp2, constitutes another circuit；
One input terminal of the output end access logic sum gate of current limit amplifier, the output end connection open-drain of logic sum gate are defeated
The grid of outlet pipe Mn3 controls open-drain efferent duct Mn3.
2. programmable USB current limiting switch according to claim 1, it is characterised in that: the reproducible amplifier includes:
Collapsible amplifier architecture using common base as amplifier input stage, the first electricity of source electrode connection of the first NMOS tube N1
R1 is hindered to ground, makes the second NMOS tube N2 using current-mirror structure, third NMOS tube N3, the 4th NMOS tube N4 replicate the first NMOS tube
Electric current in N1, the source electrode of the second NMOS tube N2 connect second resistance R2 to ground, and the drain electrode of the second NMOS tube N2 is connected to the 0th
Triode Q0, the 0th triode Q0, the first triode Q1, the second triode Q2 are separately connected a resistance RIN, utilize current mirror
Structure makes the first triode Q1, the second triode Q2 replicate the electric current in the 0th triode Q0, the first triode Q1, the two or three pole
Pipe Q2 connect composition accordion structure, third NMOS tube N3, the 4th NMOS tube with third NMOS tube N3, the 4th NMOS tube N4 respectively
N4 is separately connected 3rd resistor R3, the 4th resistance R4 and forms current-mirror structure to ground, the first PMOS tube P1 and the second PMOS tube P2,
The drain electrode of second PMOS tube P2 and the 4th NMOS tube N4 is connected, as output.
3. programmable USB current limiting switch according to claim 1, it is characterised in that: the current limit amplifier includes:
Collapsible amplifier architecture using common source as amplifier input stage, third triode Q3 and the 4th triode Q4,
Third PMOS tube P3 and the 4th PMOS tube P4 separately constitutes current-mirror structure, the 5th resistance R5 of the 4th PMOS tube P4 connection, the 6th
Resistance R6 is connected to the base stage of the 5th triode Q5, the 6th triode Q6, the 5th triode Q5, the six or three as output, output
The number ratio of grade pipe Q6 is 8: 1, and the base stage of the 5th triode Q5 passes through resistance R simultaneouslysetTo ground；The transmitting of 5th triode Q5
Pole passes through the tenth resistance R10 to ground, the 5th triode by the 9th resistance R9, the tenth resistance R10 to ground, the 6th triode Q6
Q5, the 6th triode Q6 pass through respectively the 7th resistance R7, the 8th resistance R8 and with the 8th PMOS tube P8, the 7th PMOS tube P7 group
At accordion structure, the 5th PMOS tube P5 and the 6th PMOS tube P6 provide electric current, the 5th PMOS tube P5 and the 6th PMOS for two-way
The drain electrode of pipe P6 is separately connected the source electrode of the 8th PMOS tube P8, the 7th PMOS tube P7, and the 8th PMOS tube P8, the 7th PMOS tube P7 divide
It is not connect with the drain electrode of the 6th NMOS tube N6 and the 5th NMOS tube N5, the drain electrode that the 7th PMOS tube P7 and the 5th NMOS tube N5 are connected
As output, for controlling the output power pipe MP1 and output current sample pipe MP2.
4. programmable USB current limiting switch according to claim 1, it is characterised in that: the output power pipe Mp1 and electric current
Sampling pipe Mp2 is the identical field-effect tube of size, and number ratio is 1080: 1.
5. programmable USB current limiting switch according to claim 1, it is characterised in that: further include thermal-shutdown circuit, with control
It circuit processed and is connect with door.
6. programmable USB current limiting switch according to claim 1, it is characterised in that: further include under-voltage protecting circuit, with control
It circuit processed and is connect with door.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811435638.2A CN109546999B (en) | 2018-11-28 | 2018-11-28 | Programmable USB current-limiting switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811435638.2A CN109546999B (en) | 2018-11-28 | 2018-11-28 | Programmable USB current-limiting switch |
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| Publication Number | Publication Date |
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| CN109546999A true CN109546999A (en) | 2019-03-29 |
| CN109546999B CN109546999B (en) | 2022-11-15 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050024898A1 (en) * | 2003-07-28 | 2005-02-03 | Ta-Yung Yang | Primary-side controlled flyback power converter |
| US20060119429A1 (en) * | 2004-12-02 | 2006-06-08 | Ftd Solutions Pte., Ltd. | High frequency receiver preamplifier with CMOS rail-to-rail capability |
| CN101651416A (en) * | 2009-09-10 | 2010-02-17 | 杭州矽力杰半导体技术有限公司 | Power adjustor and input current average value limiting method thereof |
| US20110291733A1 (en) * | 2010-05-31 | 2011-12-01 | Rohm Co., Ltd. | Transmitter, interface device, and car mounted communication system |
-
2018
- 2018-11-28 CN CN201811435638.2A patent/CN109546999B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050024898A1 (en) * | 2003-07-28 | 2005-02-03 | Ta-Yung Yang | Primary-side controlled flyback power converter |
| US20060119429A1 (en) * | 2004-12-02 | 2006-06-08 | Ftd Solutions Pte., Ltd. | High frequency receiver preamplifier with CMOS rail-to-rail capability |
| CN101651416A (en) * | 2009-09-10 | 2010-02-17 | 杭州矽力杰半导体技术有限公司 | Power adjustor and input current average value limiting method thereof |
| US20110291733A1 (en) * | 2010-05-31 | 2011-12-01 | Rohm Co., Ltd. | Transmitter, interface device, and car mounted communication system |
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| Publication number | Publication date |
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| CN109546999B (en) | 2022-11-15 |
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