CN209134051U - A kind of novel USB Type-C connector overheating protection circuit - Google Patents
A kind of novel USB Type-C connector overheating protection circuit Download PDFInfo
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- CN209134051U CN209134051U CN201821395805.0U CN201821395805U CN209134051U CN 209134051 U CN209134051 U CN 209134051U CN 201821395805 U CN201821395805 U CN 201821395805U CN 209134051 U CN209134051 U CN 209134051U
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Abstract
The utility model discloses a kind of novel USB Type-C connector overheating protection circuits; it includes the first protection location, the second protection location; the structure of first protection location is identical with the symmetrical configuration of the second protection location, and the first protection location and the second protection location are integrated in the first pcb board and the second pcb board at Type-C connector port respectively.The utility model utilizes the specification of USB Type-C system, USB Type-C connector interface when the temperature is excessively high, change the condition of contact of power supply and equipment room by control chip; system is set to automatically cut off the power circuit; simple and reliable to play the purpose of overheating protection, practicability is high；Additional voltage drop will not be generated on USB Type-C connecting line, system effectiveness is high；Protection location structure is simple, small in size without using high-voltage power pipe, at low cost, is easily integrated.
Description
Technical field
The utility model relates to a kind of overheating protection circuit more particularly to a kind of novel USB Type-C connector mistakes
Thermal protection circuit.
Background technique
It is widely used in the USB Type-C connector of the electronic products such as mobile phone, notebook, digital camera at present with it
Excellent performance, slim design, are pursued energetically by developer and user.Meet the Type-C connector of 3.1 standard of USB more
Be have two-sided inserting, a bite is mostly used (power supply, USB transmission, VGA/HDMI), transmission speed fast (highest 10Gbps), interface are inserted
Seat designs the advantages that slim (8.3mm × 2.5mm) and power transmission capacity strong (highest 100W).And Type-C connector exists
When as charge connector, power supply capacity can achieve 20V/5A, portable set this satisfies battery capacity is ever-increasing
The demand of standby quick charge.USB Type-C connector not only can be carried out the high-speed transfer of data, but also be able to achieve quickly filling for power supply
Electricity.
However, although Type-C connector has many advantages, such as power supply capacity is strong, connector interface jack sizes
Small and foot spacing is narrow, when peripheral cell damage, humid environment, ageing of metal deformation and external pressure cause pin to be bent,
It will make the V of wiring boardBUSShort circuit occurs with GND.If carrying out large current charge at this time, the heat that wiring board generates can directly be led
Wiring board is caused to burn.Even if, because wearing or having foreign matter when contact resistance exception occurs in Type-C interface, leading to there is no short circuit
The charging current for crossing Type-C connector is larger, will also result in Type-C interface heating burnout.The needs when there is heating problem
Cutting charge circuit in time, is just avoided that the generation of above situation, but when port overheats, equipment end and the equal nothing of power end
Method is directly found out, thus until terminal burn even it is on fire.
In response to the above problems, presently, there are solution be that excess temperature is installed on the port of USB Type-C connector
Protective device cuts off current loop when detecting temperature anomaly.Temperature protective device can for mini-Breaker, PPTC or
The control chip that cooperation high-voltage circuit breaker and thermistor use.Mini-Breaker, PPTC are usually connected when in use
On Vbus line, wherein mini-Breaker is that one kind can restore temperature detect switch (TDS), is triggered when there is temperature anomaly, at this time
Power supply is cut off, and until temperature restores normal, temperature detect switch (TDS) restores automatically；PPTC is otherwise known as self-recovery fuse, work
It is similar with temperature detect switch (TDS) to make process, but has more advantage in volume and cost.However, using mini-Breaker's and PPTC
Greatest drawback is that there are larger pressure drops, can reduce the charge efficiency of power supply in normal work.In order to improve power supply conversion efficiency,
Can the interface of USB Type-C connector plus cooperation high-voltage circuit breaker and the control chip that uses of thermistor into
Row overheating protection, as shown in Fig. 1.High-voltage power pipe M1, high-voltage power pipe M2 and second port when charging, at first port
High-voltage power pipe M3, the high-voltage power pipe M4 at place are opened, when first port or second port when the temperature is excessively high, chip controls
High-voltage power pipe M3, high-voltage power pipe M4 at high-voltage power pipe M1, high-voltage power pipe M2 or second port at Single port are closed
It closes, power supply is not cut off.Even if the conduction voltage drop of the MOS pipe used can be very low, but due to the structure of USB Type-C connecting line
Symmetry, need to meet the current direction of the both direction of no direction, therefore each port is both needed to using two-switch control ability
Ensure that electric current when overheating on power supply line is completely severed, while guaranteeing that control chip has an electricity always, thus using the program into
4 high-voltage power pipes and 2 thermistors must be used when row overheating protection simultaneously, thus voltage drop still can be very big, loss
Height, cost are also higher.
Utility model content
The technical problems to be solved in the utility model is in order to overcome the defects of the prior art, now to provide a kind of novel
USB Type-C connector overheating protection circuit, realizes bonder terminal overheating protection, simple and reliable, is easily integrated, practical
Property it is high；It does not need in VBUSSeries connection temperature detect switch (TDS) or self-recovery fuse on power supply line, will not be in VBUSAdditional voltage drop is generated on line,
It is high-efficient；It does not need using high-voltage power pipe etc., circuit cost is low.
The utility model is to solve above-mentioned technical problem by following technical proposals:
A kind of novel USB Type-C connector overheating protection circuit of the utility model, it is characterized in that, the novelty
USB Type-C connector overheating protection circuit include the first protection location and the second protection location, first protection location
Structure it is identical with the symmetrical configuration of second protection location, first protection location and second protection location difference
The second pcb board at the first pcb board and second port being integrated at the first port of the USB Type-C connector, it is described
First protection location and second protection location are connect with the channel layout line of the USB Type-C connector, and described
One protection location and second protection location are used to detect the first port at the both ends for being distributed in the Type-C connector
The temperature of temperature and second port.
Preferably, first protection location includes the first control chip, first resistor and the first thermistor, and described the
Two protection locations include the second control chip, second resistance and the second thermistor, first thermistor and described second
Thermistor is used to detect the temperature of the first port of the Type-C connector and the temperature of the second port,
In:
One end of first thermistor, second thermistor one end, it is described first control chip power supply
The power end of end and the second control chip is all connected with the V of the Type-C connectorBUSPower supply line, first electricity
One end of resistance, one end of the second resistance, the ground terminal of the first control chip and described second control the ground connection of chip
End is grounded, and the other end and described first of the first resistor is connected in parallel in the temperature sensing end of the first control chip
The voltage controling end of the other end of thermistor, the first control chip is connect with the channel layout line of the first port,
The other end and second thermistor of the second resistance is connected in parallel in the temperature sensing end of the second control chip
The other end, it is described second control chip voltage controling end connect with the channel layout line of the second port.
Preferably, the first control chip and described second controls chip by the V of Type-C connectorBUSPower supply line supplies
Electricity, power supply voltage range is between 3.3V~21V.Preferably, the first control chip includes amplifier, comparator, low pressure
The in-phase end of metal-oxide-semiconductor, 3rd resistor and the 4th resistance, the amplifier connects internal reference voltage, and the reference voltage is used for
It is compared with temperature sampling signal, the reverse side of the amplifier and described low is connected in parallel in the output end of the amplifier
Press the drain electrode of metal-oxide-semiconductor, the backward end of the comparator be connected in parallel the 3rd resistor one end and the 4th resistance
One end, the in-phase end of the comparator connect the temperature sensing end of the first control chip, the output of the comparator
End connects the grid of the low pressure metal-oxide-semiconductor, and the other end of the 3rd resistor connects the power supply of the first control chip
End, the other end of the 4th resistance connect the ground terminal of the first control chip, and the source electrode of the low pressure metal-oxide-semiconductor connects
Connect the voltage controling end of the first control chip, the structure phase of the second control chip and the first control chip
Together.
Preferably, the voltage control of the voltage controling end of the first control chip and the second control chip
End processed is used to be the channel layout line output channel voltage, and the channel voltage is greater than 2.75V.
Preferably, when having eMarker chip at the usv Type-C connector port, the circuit protection unit is also
It can be integrated on eMarker chip.
The positive effect of the utility model is:
The utility model is only with control chip and NTC (Negative Temperature Coefficient, negative temperature
Coefficient) thermistor, using the specification of Type-C system, Type-C connector interface when the temperature is excessively high, pass through control chip
Change the condition of contact of power supply and equipment room, system is made to automatically cut off the power circuit, thus play the purpose of overheating protection, letter
Single reliable, practicability is high；Additional voltage drop will not be generated on Type-C connecting line, system effectiveness is high；Protection location structure letter
It is single, it is small in size without using high-voltage power pipe, it is at low cost, it is easily integrated.
Detailed description of the invention
The overheating protection circuit structural schematic diagram of Fig. 1 prior art.
Fig. 2 is the structural schematic diagram of Type-C connector.
Fig. 3 is the overheating protection circuit structural schematic diagram of the utility model.
Fig. 4 is the circuit connection diagram of the first control chip of the preferred embodiment of the utility model.
Fig. 5 is the system application schematic diagram of overheating protection circuit.
Specific embodiment
The utility model is further illustrated below by the mode of embodiment, but is not therefore limited in the utility model
Among the embodiment described range.
It is single to refer to Fig. 2, the novel USB type-C connector overheating protection circuit of the utility model, including the first protection
Member and the second protection location, the structure of the first protection location is identical with the symmetrical configuration of the second protection location, the first protection location
At the first pcb board and second port being integrated at USB Type-C connector first port respectively with the second protection location
The V of two pcb boards, the first protection location and the second protection location with USB Type-C connectorBUSPower supply line, ground wire and logical
The connection of road layout line, the first protection location and the second protection location are for detecting the first of the both ends for being distributed in Type-C connector
The temperature of port and the temperature of second port.The fever when charging of Type-C connector need to be to solve due to the utility model
Problem is now first introduced the live part of USB Type-C connector.Each pin of USB Type-C connector interface is fixed
Justice is as shown in following table (table 1):
Table 1
Table 1 is USB Type-C connector interface pinouts, wherein three groups of D (USB 2.0), TX/RX (USB 3.1) difference
Signal is made data transmission and is used, and CC1/CC2 is that channel configuration pin is mainly used in the utility model there are many effects
The several effects as follows of CC1/CC2 pin: detection connection, distinguish front and back sides, distinguish DFP (Downstream Facing Port) and
UFP (Upstream Facing Port) configures VBUSTwo kinds of operating modes: USB Type-C and USB Power
Delivery(PD)。VBUSFor USB power source, GND is ground, and SBU is sideband bus.
There are five types of operational modes when carrying out power transmission for USB Type-C connector, and wherein USB PD operational mode has
There is highest priority.It is as shown in table 2 below:
Table 2
When power end and equipment end are all satisfied USB PD agreement, power transmission is carried out by PD mode is preferentially followed.USB
Type-C connector equally meets backward compatible characteristic, i.e., compatible priority is lower than the operational mode of USB PD.Wherein second
VBUSPower transmission line of the power supply line between power end and equipment end, channel layout line (CC line) are used to carry out downstream end and upper
Communication between row end.USB Type-C connector is as follows from the process for being connected to progress power transmission:
The first step connects the end the A power supply of connector, and the end B is connect with electronic equipment, then the end A is downstream end, and the end B is upper
Row end, wherein downstream end can be by control metal-oxide-semiconductor M1, M2, M3 and M4 come the 2nd V of on/offBUSPower supply line；
Second step, according to direction of insertion, the CC1 pin of downstream end is connected by CC line with the CC1 pin of upstream ends；Under
Row end controls first switch unit K1 and second switch unit K2, and CC1, CC2 pin are connect with pull-up resistor Rp1, Rp2, on
CC1, CC2 pin at row end are connect with pull down resistor Rd1, Rd2, and downstream end detects the drop-down of upstream ends CC line by CC line
The feedback voltage of resistance Rd and after maintaining a period of time (100~200ms), determines there is an equipment access, downstream end control VBUS is led
It is logical；After upstream ends detect VBUS, determination has plant-grid connection
Third step, downstream end dynamic adjust the resistance value of the first pull-up resistor Rp1, the first different pull-up resistor Rp1 value tables
Show that downstream end provides different charging currents, the pull down resistor Rd1=5.1k Ω of upstream ends, downlink to upstream ends by VBUS
End determines that equipment is in connection status by the voltage VRd1 on detection Rd1.Flow through electric current, the pull-up resistor Rp resistance of VBUS
Value, pull down resistor both ends VRd and Vopen between relationship as shown in table 3 (wherein Vopen be equipment end CC line it is hanging when
Voltage):
Table 3
| Power supply statement | USB Type-C electric current | Rp | VRd | Vopen |
| Default USB output power | 900mA | 56k Ω ± 20% | 0.25-1.5V | 1.65V |
| 1.5A@5V | 1.5A | 22k Ω ± 5% | 0.45-1.5V | 1.65V |
| 3A@5V | 3A | 10k Ω ± 5% | 0.85-2.45V | 2.75V |
4th step, in downstream end not using to CC2 pin VCONN is connected to by switch K2, VCONN is interior
Portion's power supply signal.Preferably, the first pcb board connection may be provided with eMarker chip.VCONN is used to be USB Type-C
EMarker circuit power supply on interface, eMarker circuit can realize the electronic marker of USB Type-C connector
(Electronically Marked Cable), to support USB PD mode.Electronic marker cable can determine the electricity of connecting line
The key properties such as current load ability, when power supply and equipment obey USB PD agreement, downstream end detects USB by eMarker
The current carrying capacities of Type-C connecting line, and by periodically sending Source_Capabilities message to equipment end come sound
Oneself bright power output capacity；After power end receives response GoodCRC of the equipment end to Source_Capabilities,
PD communication acknowledgement is established, and the work of USB Type-C connector is in USB PD mode to carry out high-power output (> 15W)；
5th step, downstream end detect the pull down resistor Rd1 of upstream ends persistently to ensure that equipment is in access state, once inspection
Voltage VRd1 >=Vopen is measured, illustrates that upstream ends CC line is hanging, equipment has disconnected,It is moved with the power supply on VCONN
It removes, CC1, CC2 pin enter high-impedance state (ZOPEN > 126k Ω)；After tErrorRecovery=25ms, upstream ends
Into Unattached.SNK (trap is not connected) state, equipment end waits the access of power supply, and downstream end enters
Unattached.SRC (source is not connected) state, the access of power end waiting facilities；
6th step, downstream end detect the pull down resistor Rd1 of upstream ends again, and wait for a period of time (10~20ms)
Return step two afterwards reenter charged state, if protection location detects that port temperature is still excessively high at this time, continue to overheat
Protection act.As shown in figure 3, the first protection location described in the utility model include first control chip IC 1, first resistor R1 and
First thermistor NTC1, second protection location include the second control chip IC 2, second resistance R2 and the second thermistor
NTC2, the first thermistor NTC1 and the second thermistor NTC2 are used to detect the temperature of the first port of USB Type-C connector
The temperature of degree and the second port, in which:
One end of the first thermistor of the utility model NTC1, one end of the second thermistor NTC2, the first control chip
The power end VDD of the control chip IC 2 of the power end VDD of IC1 and second is all connected with the V of the USB Type-C connectorBUSPower supply
Line, one end of first resistor R1, one end of second resistance R2, the first ground terminal GND and second for controlling chip IC 1 control core
The ground terminal GND of piece IC2 is grounded, and the temperature sensing end VT of the first control chip IC 1 is connected in parallel first resistor R1's
The other end of the other end and the first thermistor NTC1, the voltage controling end V of the first control chip IC 1CTR1With first port
The other end and the of second resistance R2 is connected in parallel in the temperature sensing end VT of the connection of channel layout line, the second control chip IC 2
The other end of two thermistor NTC2, the voltage controling end V of the second control chip IC 2CTR2With the channel layout line of second port
Connection.
Preferably, the first control chip IC and second controls chip IC 2 by the V of the USB Type-C connectorBUS
Power supply line power supply, power supply voltage range is between 3.3V~21V.
Preferably, as shown in figure 4, the utility model first control chip IC 1 include amplifier AMP, it is comparator CMP, low
The in-phase end of metal-oxide-semiconductor M1,3rd resistor R3 and the 4th resistance R4, amplifier AMP is pressed to connect internal reference voltage VREF, with reference to electricity
Press VREFFor being compared with temperature sampling signal, the reverse side of amplifier and low is connected in parallel in the output end of amplifier AMP
Press metal-oxide-semiconductor M1 drain electrode, the backward end of comparator CMP be connected in parallel 3rd resistor R3 one end and the 4th resistance R4 one
End, the temperature sensing end VT of in-phase end connection the first control chip IC 1 of comparator CMP, the output end connection of comparator CMP are low
The grid of metal-oxide-semiconductor M1 is pressed, the other end connection first of 3rd resistor R3 controls the power end VDD of chip IC, the 4th resistance R4's
The electricity of source electrode connection the first control chip IC 1 of the ground terminal GND of other end connection the first control chip IC 1, low pressure metal-oxide-semiconductor M1
Press control terminal VCTR1, second control chip IC 2 with first control the structure of chip IC 1 it is identical.
Preferably, the voltage control of the control chip IC 2 of voltage controling end VT and second of electricity the first control chip IC 1
End VT processed is used to be channel layout line, that is, CC1 line and CC2 line output channel voltage, and the channel voltage is greater than 2.75V.
With reference to Fig. 5, a kind of method for excessive heating protection using novel USB Type-C connector overheating protection circuit, step
Suddenly include:
When power supply and not connected equipment, VBUSNo-voltage on power supply line, protection location not power consumption, sets when by power supply and electronics
The standby first port and the second end for being connected to the novel USB Type-C connector overheating protection circuit
Mouthful, to there is voltage on the 2nd VBUS power supply line, the channel layout line CC1 line of the first port persistently detects the second end
Mouthful pull down resistor Rd1 or pull down resistor Rd2 on feedback voltage be in access state to ensure the electronic equipment, distinguish shape
At power end and equipment end.
When the first port connecting with the power supply i.e. power end temperature rises, the first protection location is used for power end
Interface carries out overheating protection, and the temperature sensing end VT of the first control chip IC 1 obtains first electricity at the both ends the first resistor R1
Pressure value VR1, and the first voltage value V that will acquireR1It is compared with the first preset voltage value, when the first voltage value is beyond described the
One predeterminated voltage, the voltage controling end VT of the first control chip IC 1 export interference voltage to the channel layout line CC of first port
On line, the channel for making the feedback voltage on the pull down resistor Rd1 or pull down resistor Rd2 of the second port be greater than first port is matched
The hanging voltage for setting line then determines that electronic equipment has disconnected after the channel layout line of first port detects hanging voltage,
First port, which generates, removes power supply movement, to realize overheating protection；That is, the first protection is single with the rising of temperature
For carrying out overheating protection to power supply end interface, the temperature sensing end VT of the overheating protection unit first control chip IC 1 is obtained member
Take the first voltage value V at the both ends first resistor R1R1, and the first voltage value V that will acquireR1With the voltage at the both ends second resistance R2
VR2It is compared, the first thermistor NTC1 resistance decrease, the first voltage value VR1Rise, as the first voltage value VR1More than VR4When,
Comparator exports high level, and low pressure metal-oxide-semiconductor M1 is opened, and source electrode exports VREFVoltage.The voltage control of first control chip IC 1 at this time
End V processedCTRLInterference voltage, the actuation voltage V for the second port for detecting the CC line of first port are exported to CC lineRdIt is greater than
Voltage when CC1 pin floating, therefore, it is determined that electronic equipment has disconnected, first port, which generates, removes VBUSPower supply movement；
When the second port temperature connecting with electronic equipment rises, the temperature sensing end of the first control chip IC 1
Obtain the second voltage value V at the both ends second resistance R2R2, and the second voltage value V that will acquireR2It is carried out with the second preset voltage value
Compare, as second voltage value VR2Beyond the second predeterminated voltage, the voltage controling end output interference voltage of the second control chip IC 2 is arrived
On the channel layout line CC2 line of second port, the feedback voltage of second port is made to be greater than the hanging of first port channel layout line
Voltage then determines that electronic equipment has disconnected, first port generates after the channel layout line of first port detects the voltage
The power supply movement is removed, to realize overheating protection；That is when equipment end temperature rise, the second protection location for pair
Equipment end interface carries out overheating protection, and the temperature sensing end VT which controls chip IC 2 obtains the second electricity
Hinder the first voltage value V at the both ends R2R2, and the second voltage value V that will acquireR2With the voltage V at the 4th both ends resistance R4R4Compared
Compared with the rising of temperature, the second thermistor NTC2 resistance decrease, second voltage value VR2Rise, as second voltage value VR2It is super
Cross VR4When, comparator exports high level, and low pressure metal-oxide-semiconductor M1 is opened, and source electrode exports VREFVoltage.Second control chip IC 2 at this time
Voltage controling end VCTRLInterference voltage, the actuation voltage V for the second port for detecting the CC line of first port are exported to CC lineRd
Voltage when greater than CC1 pin floating, therefore, it is determined that electronic equipment has disconnected, first port, which generates, removes VBUSPower supply movement；
Then, first port enters waiting facilities connection status, and is kept for a period of time (10~20ms), it will be later
After detecting the feedback voltage of pull down resistor Rd1, Rd2 of second port and maintaining a period of time (100~200ms), build again
The connection of vertical power supply and electric room, if still to detect connector port temperature excessively high for protection location at this time, will continue into
Row overheating protection.The access waiting time of USB Type-C connector can produce the sluggish of protection and control with the time is judged, to keep away
Exempt from the quick-speed turning on-off of charging process, so that the port temperature of connector be effectively reduced.
When carrying out overheating protection, the access waiting time of USB Type-C connector generates the slow of protection with the time is judged
Stagnant control, to avoid the quick-speed turning on-off of charging process, so that the temperature of the first port of USB Type-C connector be effectively reduced
With the temperature of second port.
The utility model is based on USB Type-C connector, using the specification of USB Type-C system, in USB Type-
C connector interface when the temperature is excessively high, is changed the condition of contact of power supply and equipment room by control chip, automatically cuts off system
Electric power loop, to play the purpose of overheating protection, simple and reliable, practicability is high；It will not be produced on USB Type-C connecting line
Raw additional voltage drop, system effectiveness are high；Protection location structure is simple, small in size without using high-voltage power pipe, at low cost, is easy to
It is integrated.
Combine figure embodiment that the utility model is described in detail above, those skilled in the art can root
Many variations example is made to the utility model according to above description.Within the spirit and principle of the utility model, made
What modification, equivalent replacement, improvement etc., should be included within the scope of protection of this utility model.Thus, it is certain in embodiment
Details should not constitute the restriction to the utility model, and the utility model will be using the range that the appended claims define as this reality
With novel protection scope.
Claims (6)
1. a kind of novel USB Type-C connector overheating protection circuit, which is characterized in that the novel USB type-C
Connector overheating protection circuit includes the first protection location and the second protection location, the structure of first protection location and described
The symmetrical configuration of second protection location is identical, and first protection location and second protection location are integrated in USB respectively
The second pcb board at the first pcb board and second port at Type-C connector first port, first protection location and institute
State V of second protection location with the USB Type-C connectorBUSPower supply line, ground wire and the connection of channel layout line, described the
One protection location and second protection location are used to detect the first port at the both ends for being distributed in the Type-C connector
The temperature of temperature and second port.
2. novel USB Type-C connector overheating protection circuit according to claim 1, which is characterized in that described
One protection location includes the first control chip, first resistor and the first thermistor, and second protection location includes the second control
Coremaking piece, second resistance and the second thermistor, first thermistor and second thermistor are described for detecting
The temperature of the first port of Type-C connector and the temperature of the second port, in which:
One end of first thermistor, second thermistor one end, it is described first control chip power end and
The power end of the second control chip is all connected with the V of the USB Type-C connectorBUSPower supply line, first electricity
One end of resistance, one end of the second resistance, the ground terminal of the first control chip and described second control the ground connection of chip
End is grounded, and the other end and described first of the first resistor is connected in parallel in the temperature sensing end of the first control chip
The voltage controling end of the other end of thermistor, the first control chip is connect with the channel layout line of the first port,
The other end and second thermistor of the second resistance is connected in parallel in the temperature sensing end of the second control chip
The other end, it is described second control chip voltage controling end connect with the channel layout line of the second port.
3. novel USB Type-C connector overheating protection circuit according to claim 2, which is characterized in that described
One control chip and described second controls chip by the V of the USB Type-C connectorBUSPower supply line power supply, power supply electricity
Press range between 3.3V~21V.
4. novel USB Type-C connector overheating protection circuit according to claim 3, which is characterized in that described
One control chip includes amplifier, comparator, low pressure metal-oxide-semiconductor, 3rd resistor and the 4th resistance, and the in-phase end of the amplifier connects
Internal reference voltage is connect, the reference voltage is used for and temperature sampling signal is compared, and the output end of the amplifier is in parallel
Ground connects the drain electrode of the reverse side and the low pressure metal-oxide-semiconductor of the amplifier, and institute is connected in parallel in the backward end of the comparator
One end of 3rd resistor and one end of the 4th resistance are stated, the in-phase end of the comparator connects the first control chip
The temperature sensing end, the output end of the comparator connect the grid of the low pressure metal-oxide-semiconductor, the other end of the 3rd resistor
The power end of the first control chip is connected, the other end of the 4th resistance connects the institute of the first control chip
Ground terminal is stated, the source electrode of the low pressure metal-oxide-semiconductor connects the voltage controling end of the first control chip, second control
Chip is identical as the first control structure of chip.
5. novel USB Type-C connector overheating protection circuit according to claim 4, which is characterized in that described
The voltage controling end of the voltage controling end of one control chip and the second control chip is used to match for the channel
Line output channel voltage is set, the channel voltage is greater than 2.75V.
6. novel USB Type-C connector overheating protection circuit according to claim 5, which is characterized in that when described
When having eMarker chip at USB Type-C connector port, the circuit protection unit can also be integrated in eMarker chip
On.
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| CN201821395805.0U CN209134051U (en) | 2018-08-28 | 2018-08-28 | A kind of novel USB Type-C connector overheating protection circuit |
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| CN201821395805.0U CN209134051U (en) | 2018-08-28 | 2018-08-28 | A kind of novel USB Type-C connector overheating protection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923383A (en) * | 2018-08-28 | 2018-11-30 | 苏州力生美半导体有限公司 | A kind of novel USB Type-C connector overheating protection circuit and its method for excessive heating protection |
| CN112531839A (en) * | 2020-12-02 | 2021-03-19 | 深圳慧能泰半导体科技有限公司 | USB cable control device with temperature limitation and method |
| CN112838566A (en) * | 2021-04-21 | 2021-05-25 | 珠海智融科技有限公司 | Over-temperature protection circuit, method and system for Type-C interface |
-
2018
- 2018-08-28 CN CN201821395805.0U patent/CN209134051U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923383A (en) * | 2018-08-28 | 2018-11-30 | 苏州力生美半导体有限公司 | A kind of novel USB Type-C connector overheating protection circuit and its method for excessive heating protection |
| CN112531839A (en) * | 2020-12-02 | 2021-03-19 | 深圳慧能泰半导体科技有限公司 | USB cable control device with temperature limitation and method |
| CN112838566A (en) * | 2021-04-21 | 2021-05-25 | 珠海智融科技有限公司 | Over-temperature protection circuit, method and system for Type-C interface |
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