CN108919871A - power transmission device - Google Patents
power transmission device Download PDFInfo
- Publication number
- CN108919871A CN108919871A CN201710887837.6A CN201710887837A CN108919871A CN 108919871 A CN108919871 A CN 108919871A CN 201710887837 A CN201710887837 A CN 201710887837A CN 108919871 A CN108919871 A CN 108919871A
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- Prior art keywords
- load
- voltage
- power supply
- power
- transmission
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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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
Abstract
The present invention proposes a kind of power transmission device comprising a power supply transmission unit is to generate a power supply, and a load unit is to receive the power supply, at least a connector, a cable, at least a power switch and a communication interface.Power supply transmission unit and load unit are coupled against each other by connector and cable and transmit power supply.One voltage threshold is determined according to the transmission electric current of power supply or the load current of load unit, when a voltage difference of the load voltage for sending voltage and load unit of power supply is greater than the voltage threshold, control power switch be not turned on, wherein by the communication interface read the transmission voltage, the transmission electric current, the load voltage and the load current at least one of.
Description
Technical field
The present invention relates to a kind of power transmission devices, particularly relate to a kind of power transmission device of detectable cable exception.
Background technique
Figure 1A shows a kind of power transmission device (power transmission device 1A) of prior art, wherein power supply transmission unit 10
To generate a power supply, and there is a fixed cable 50 (captive cable), power transmission device 1A by cable 50 with
And connector 40 and load unit 20 couple, and transmit power supply to load unit 20 from power supply transmission unit 10.Figure 1B is shown separately
A kind of power transmission device (power transmission device 1B) of the prior art, power transmission device 1B and power transmission device 1A phase
Seemingly, be different in power supply transmission unit 10 also have a connector 30, and cable 50 be detachable cable (can completely with
Power supply transmission unit 10 and load unit 20 separate), power transmission device 1B passes through detachable cable 50 and connector
30 and 40 couple with load unit 20 and transmit power supply.Fig. 1 C shows power transmission device (the power supply biography of another prior art
Defeated device 1C), power transmission device 1C is similar to power transmission device 1A, it is different in power transmission device 1C, Gu
Fixed pattern cable 50 is located at load unit 20, and power supply transmission unit 10 has a connector 30.
Fig. 1 D shows the equivalent circuit diagram corresponding to Figure 1B comprising cable 50 and connector 30 and 40 equivalent electricity
Road, wherein Ra, Rb respectively represent the equivalent resistance of connector 30 and 40, and Rc represents the equivalent resistance of cable 50, and Rp is then represented
Coupling equivalent resistance between couple of conductor (such as power supply line and ground line) of cable 50, wherein Rp in cable under normal circumstances
It should be infinitely great (insulation).Cable is after being used for a long time, it may occur however that the electric conductivity of cable itself or connector is deteriorated, also
It is that Rc, Ra or Rb become larger, therefore, the power dissipation on cable 50 and connector 30 and 40 becomes larger, and gently then causes power consumption, seriously
Shi Ze may cause cable or the temperature of connector is excessively high, and causes user to burn or cable or connector are burnt.This
Outside, another cable abnormal patterns, then insulating layer of the possible inducement between conducting wire peels off, or has other foreign matters to be coupled to conducting wire
Between, and make Rp too small, the short circuit current on conducting wire is caused, in the case, it is also possible to so that cable or connector are burnt.
In general, detection of the prior art for above-mentioned cable exception, a kind of common mode is in cable or connection
Device nearby unit temp sensor (such as thermo-sensitive resistor), to detect whether occur temperature anomaly, however such mode because
Temperature sensor is needed, thus will increase cost and volume, and be not easy to implement in cable on-line equipment temperature sensor.
The present invention compared to the prior art, is detected by then passing through detection difference power or current difference or voltage difference as above-mentioned
Cable it is abnormal, therefore be not required to temperature sensor, therefore cost can be reduced, and the exception of cable can also be detected effectively.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art and defect, propose a kind of power transmission device, are not required to
Temperature sensor, therefore cost can be reduced, and the exception of cable can also be detected effectively.
In order to achieve the above-mentioned object of the invention, one of viewpoint is sayed, the present invention provides a kind of power transmission device, packets
Contain：One power supply transmission unit, to generate a power supply, wherein the power supply has one to send voltage simultaneously in the power supply transmission unit end
It provides one and sends electric current, which includes：One sending controling circuit, to control the transmission voltage and transmission electricity
Stream；And one send voltage sensing circuit, to sense the transmission voltage and provide this information to the sending controling circuit；One
Load unit is coupled to the power supply transmission unit to receive the power supply, and generates a load current and a load voltage, wherein
The power supply transmission unit and the load unit form a power delivery loops, which includes：One load control circuit is used
To control the load voltage and the load current；And a load voltage sense circuit, to sense the load voltage and by this
Information is supplied to the load control circuit；One connecting interface is located on the power delivery loops, sends list to couple the power supply
Member and the load unit, and the power supply is transmitted whereby；An at least power switch is located on the power delivery loops, to switch
The transmission circuit of the power supply is conducting or is not turned on；An at least current sensing circuit, to sense the transmission electric current and/or this is negative
Carry electric current；And a communication interface, to be communicated between the power supply transmission unit and the load unit；The wherein transmission
Control circuit or the load control circuit determine a voltage threshold according to the transmission electric current or the load current, and according to the hair
Whether power transmission pressure and a voltage difference of the load voltage are greater than the voltage threshold, and judge whether there is and be abnormal.
In a preferred embodiment, when the voltage difference is greater than the voltage threshold, the sending controling circuit or the load control
The circuit control processed power switch is to be not turned on.
In a preferred embodiment, when the voltage difference is greater than the voltage threshold, which downgrades the transmission
Voltage and/or the load control circuit downgrade the load current.
In a preferred embodiment, when the transmission voltage downgrades a lowest voltage level and/or the load current downgrades
When to a minimum current level, it is to be not turned on that the sending controling circuit or the load control circuit, which control the power switch,.
In a preferred embodiment, the sending controling circuit or the load control circuit read the hair by the communication interface
Power transmission pressure, the transmission electric current, the load voltage and the load current at least one of.
Another viewpoint is sayed that present invention provides a kind of power transmission devices, include：One power supply transmission unit is used
To generate a power supply, wherein the power supply has one to send voltage in the power supply transmission unit end, which has a default
Voltage level；And a load unit, be coupled to the power supply transmission unit to receive the power supply, and generate a load current with
And a load voltage, wherein the power supply transmission unit and the load unit form a power delivery loops, which includes：
One load control circuit, to control the load voltage and the load current；One load voltage sense circuit, it is negative to sense this
Voltage is carried, and provides this information to the load control circuit；One load current sensing circuit, to sense the load current,
And provide this information to the load control circuit；One connecting interface is located on the power delivery loops, to couple the power supply
Transmission unit and the load unit, and the power supply is transmitted whereby；And a power switch, to switch the transmission circuit of the power supply
To be connected or being not turned on；Wherein the load control circuit determines a voltage threshold according to the load current, and according to the load
Whether voltage is less than the voltage threshold, and judges whether there is and be abnormal.
In a preferred embodiment, when the load voltage is less than the voltage threshold, the sending controling circuit or the load
It is to be not turned on that control circuit, which controls the power switch,.
In a preferred embodiment, when the load voltage is less than the voltage threshold, it is negative which downgrades this
Carry electric current.
In a preferred embodiment, when the load current downgrades a minimum current level, the load control circuit control
Making the power switch is to be not turned on.
Another viewpoint is sayed that present invention provides a kind of power transmission devices, include：One power supply transmission unit is used
To generate a power supply, wherein the power supply has one to send voltage and provide one and sends electric current, be somebody's turn to do in the power supply transmission unit end
Power supply transmission unit includes：One sending controling circuit, to control the transmission voltage and the transmission electric current；And one send electric current
Sensing circuit to sense the transmission electric current, and provides this information to the sending controling circuit；One load unit, is coupled to
The power supply transmission unit generates a load current to receive the power supply, wherein the power supply transmission unit and the load unit shape
At a power delivery loops, which includes：One load control circuit, to control the load current；And one load
Current sensing circuit to sense the load current, and provides this information to the load control circuit；One connecting interface, position
In on the power delivery loops, to couple the power supply transmission unit and the load unit, and the power supply is transmitted whereby；At least one
Power switch is located on the power delivery loops, to switch the transmission circuit of the power supply as conducting or be not turned on；And one is logical
Interface is believed, to be communicated between the power supply transmission unit and the load unit；The wherein sending controling circuit or this is negative
It carries control circuit and whether a current threshold is greater than according to a current difference of the transmission electric current and the load current, and judge whether there is
It is abnormal.
In a preferred embodiment, when the current difference is greater than the current threshold, the sending controling circuit or the load control
The circuit control processed power switch is to be not turned on.
In a preferred embodiment, the sending controling circuit or the load control circuit read the hair by the communication interface
Power transmission stream and/or the load current.
Another viewpoint is sayed that present invention provides a kind of power transmission devices, include：One power supply transmission unit is used
To generate a power supply, wherein the power supply has one to send voltage and provide one and sends electric current, be somebody's turn to do in the power supply transmission unit end
Power supply transmission unit includes：One sending controling circuit；And one send current sensing circuit, to sense the transmission electric current, and
Provide this information to the sending controling circuit；One sends power switch, is controlled by the sending controling circuit and switchs the transmission
Voltage and/or the transmission electric current；One load unit receives the power supply, and generates a load current, including：One load control electricity
Road, to control the load current；And one bearing power switch, be controlled by the load control circuit and switch the load electricity
Stream；And a connecting interface, it is located on the power delivery loops, to couple the power supply transmission unit and the load unit, and
The power supply is transmitted whereby；Wherein when judging bearing power switch to be not turned on, whether an electricity is greater than according to the transmission electric current
Threshold value is flowed, and judges whether there is and is abnormal.
In a preferred embodiment, when bearing power switch is to be not turned on, and the transmission electric current is greater than the current threshold
When, it is to be not turned on which, which controls the transmission power switch,.
In a preferred embodiment, which further includes a communication interface, in the power supply transmission unit
It is communicated between the load unit, wherein the sending controling circuit is synchronous by the communication interface with the load control circuit
Bearing power switch is the period being not turned on.
Below by way of specific embodiment elaborate, should be easier to understand the purpose of the present invention, technology contents, feature and
The effect of it is realized.
Detailed description of the invention
Figure 1A -1C shows a kind of schematic diagram of prior art power transmission device；
Fig. 1 D shows the schematic equivalent circuit corresponding to Figure 1A -1C；
Fig. 2 shows the schematic diagram of an embodiment of power transmission device of the invention；
Fig. 3 is shown under certain power, sends electric current or load current corresponds to the table of comparisons of voltage difference；
Fig. 4 shows the schematic diagram of an embodiment of power transmission device of the invention；
Fig. 5 shows the schematic diagram of an embodiment of power transmission device of the invention；
Fig. 6 A shows the operational flowchart corresponding to Fig. 2, Fig. 4 and Fig. 5 embodiment；
Fig. 6 B shows the operational flowchart corresponding to Fig. 7 embodiment；
Fig. 7 shows the schematic diagram of an embodiment of power transmission device of the invention；
Fig. 8 shows the schematic diagram of an embodiment of power transmission device of the invention；
Fig. 9 shows the schematic diagram of an embodiment of power transmission device of the invention；
Figure 10 shows the operational flowchart corresponding to Fig. 8 embodiment.
Symbol description in figure
1A, 1B, 1C, 1D power transmission device
2,4,5,7,8,9 power transmission devices
10,10 ' power supply transmission units
11 sending controling circuits
12 send voltage sensing circuit
13 send current sensing circuit
20 load units
21 load control circuits
22 load voltage sense circuits
23 load current sensing circuits
30,40 connectors
50 cables
60 connecting interfaces
Ra, Rb, Rc, Rp equivalent resistance
ID sends electric current
ILD load current
ITF communication interface
SWD, SWL power switch
VD sends voltage
VLD load voltage
Specific embodiment
Attached drawing in the present invention belongs to signal, is mostly intended to indicate coupling relationship and each signal waveform between each circuit
Between relationship, as circuit, signal waveform and frequency then and not according to ratio draw.
Referring to Fig. 2, showing an embodiment (power transmission device 2) signal of power transmission device of the invention in figure
Figure, power transmission device 2 include a power supply transmission unit 10, a load unit 20, connecting interface 60, power switch SWD and
An at least current sensing circuit, wherein connecting interface 60 may include that such as, but not limited to connector 30 and 40 (is located at power supply
Transmission unit 10 and load unit 20) and cable 50.Please refer to Fig. 6 A, Fig. 6 A, which is shown, corresponds to electricity of the invention in Fig. 2
The operational flowchart of source transmitting device.Wherein power supply transmission unit 10, should to generate a power supply (such as voltage source in Fig. 2)
Power supply has one to send voltage VD and provides a transmission electric current ID in power supply transmission unit side, wherein " power supply transmission unit side "
Electric current is sent, is referred in power supply transmission unit 10, on current loop and in 30 (if present) of cable 50 and connector
An electric current in (the namely left side of connector 30 in figure), power supply transmission unit 10 include before：One sending controling circuit 11 is used
To control the transmission voltage and the transmission electric current and a transmission voltage sensing circuit 12, to sense a transmission voltage VD,
Middle transmission voltage VD is in power supply transmission unit side, in the voltage on current loop and before 30 (if present) of connector.
Load unit 20 is coupled to the power supply transmission unit to receive the power supply, and generates a load current ILD and a load voltage
VLD, wherein power supply transmission unit 10 and load unit 20 form a power delivery loops；Wherein load unit 20 can for for example but
It is not limited to a running gear (such as a smartphone) and/or rechargeable battery therein.Load unit 20 includes：Load control
Circuit 21, to control load voltage VLD and load current ILD and load voltage sense circuit 22, to sense load electricity
VLD is pressed, and provides this information to load control circuit 21.Wherein load voltage VLD is in load unit side, in current loop
It is upper and after 40 (if present) of cable 50 and connector (the namely right side of connector 40 in figure) a voltage.It is real one
It applies in example, sending voltage sensing circuit 12 can omit with load voltage sense circuit 22, and directly to couple sending controling circuit
Or load control circuit or other modes send voltage VD and load voltage VLD to sense.In addition, in other embodiments, even
The connecting interface of connection interface 60 or other forms, such as only with connector, or only with cable or other modes coupling electricity
Source transmission unit 10 and load unit 20.
Please continue to refer to Fig. 2, in the present embodiment, cable 50 by connector 30 and 40 couple power supply transmission unit 10 with
Load unit 20, to transmit the power supply.It should be noted that in one embodiment, power transmission device of the invention can
Only include a connector, it is, connector 30 or 40 one of them can be omitted, in the case, the then direct coupling of cable 50
It is connected to power supply transmission unit 10 or load unit 20 not including connector.In one embodiment, cable 50 can omit, and only with
Connector couples power supply transmission unit 10 and load unit 20 as connecting interface.In one embodiment, power switch can position
In on power delivery loops to switch the transmission circuit of the power supply as conducting or be not turned on.In the present embodiment, power switch SWD,
As shown, being located at power supply transmission unit 10, to switch the transmission circuit of the power supply as conducting or be not turned on；It should be noted
It is that in other embodiments, power switch may be alternatively located at load unit 20.In the present embodiment, current sensing circuit (sends electric current
Sensing circuit 13) it is located at power supply transmission unit 10, electric current ID is sent to sense；It should be noted that in other embodiments, electricity
Influenza slowdown monitoring circuit may be alternatively located at load unit 20, to sense load current ILD.Communication interface ITF in power supply then to send
It is communicated between unit 10 and load unit 20.It should be noted that in one embodiment, communication interface ITF can be located at cable
In (such as cable 50), and in other embodiments, communication interface ITF can not be located in the cable, and be connect by other
Touching is or contactless connection type is communicated.
Please continue to refer to Fig. 2, sending controling circuit 11 determines a voltage threshold VTH according to electric current ID is sent, and according to
Whether the voltage difference Vdrop for sending voltage VD and load voltage VLD, which is greater than voltage threshold VTH, (corresponds in Fig. 6 A, step S3
With S4), and judge whether cable or connector (namely connecting interface 60) are abnormal, it in one embodiment, can be in even
When connection interface 60 is abnormal, control power switch SWD is to be not turned on；For example, VTH=ID*RTH, wherein RTH be
The upper limit value of Rdrop=Ra+Rb+Rc, it is therefore, aforementioned whether to have the judgement being abnormal for a viewpoint, it also can be considered root
Whether it is greater than resistance threshold RTH according to Rdrop and determines and (correspond in Fig. 6 A, step S3 and S4).In one embodiment, work as voltage
When poor Vdrop is greater than voltage threshold VTH while occurring (be namely judged as have abnormal), sending controling circuit 11 controls power switch
SWD is to be not turned on (to correspond in Fig. 6 A, step S4 and S8；Such as pass through control signal VCD), with protection power source transmitting device,
It, in one embodiment, can (such as voltage difference Vdrop be greater than voltage threshold by above-mentioned judging result in addition, as shown in Figure 6A
VTH), user is returned, to warn the exception of cable and connector.And in one embodiment, it is controlled in sending controling circuit 11
Power switch SWD is before being not turned on, and sending controling circuit 11 can first downgrade transmission voltage VD and (such as, but not limited to pass through control
Voltage source in Fig. 2) and/or load control circuit 21 first downgrade load current ILD (such as, but not limited to by control figure 2
RL), so that power on cable 50 can thus reduce and (correspond in Fig. 6 A, step S9)；And in one embodiment, before
That states downgrades process (corresponding in Fig. 6 A, step S7 and S9), when transmission voltage VD downgrades a lowest voltage level and/or bears
When load electric current ILD has downgraded a minimum current level, it is to be not turned on (to correspond to that sending controling circuit 11, which controls power switch SWD,
In Fig. 6 A, step S8), with protection power source transmitting device.In other embodiments, can also when being judged as has abnormal occur,
Carry out the protection operation of other forms.
In power transmission device of the invention, communication interface ITF, which can be used to read, to be sent voltage VD, sends electric current ID, is negative
At least one of load voltage VLD and load current ILD, (corresponded in Fig. 6 A, step with determination voltage threshold VTH above-mentioned
Rapid S1), or calculate and judge whether send voltage VD and a voltage difference Vdrop of load voltage VLD is greater than voltage threshold VTH
(corresponding in Fig. 6 A, step S3 and S4).In the present embodiment, sending controling circuit 11 or load control circuit 21 can pass through communication
Interface ITF read send voltage VD, send electric current ID, load voltage VLD at least one of.It should be noted that implementing one
In example, Analog-digital Converter can be passed through by sending voltage VD, transmission electric current ID, load voltage VLD and load current ILD
(Analog to Digital Converter, ADC) circuit is converted into digital form, is then passed again by communication interface ITF
Give it.It should be noted that operation above-mentioned can repeat to operate after a preset time, with lasting sense cable with connect
Whether device is abnormal (corresponding in Fig. 6 A, step S5).In addition, please continue to refer to Fig. 6 A, in one embodiment, can in step S3 it
Before, carry out a pre- diagnosis algorithm (step S2 and S6), with determine send voltage VD, send electric current ID, load voltage VLD and
Whether load current ILD is respectively in respective preset range, if exceeding preset range, power switch control is not turned on
(corresponding to step S6 in Fig. 6 A), with protection power source transmitting device.
Referring to Fig. 3, show voltage difference Vdrop above-mentioned in figure and send the relationship between electric current ID or load current ILD,
For example, in one embodiment, connecting interface, that is, cable 50 and/or connector (such as connector 30 and 40) institute energy
The upper limit of the power of receiving is 1W, then according to different transmission electric current ID or load current ILD (such as Figure 1A in figure, 2A ...
5A), corresponding voltage difference Vdrop threshold value (VTH namely above-mentioned) is then respectively 1V, 0.5V ... 0.2V as shown in the figure；From
For another viewpoint, that is, in a certain specific currents, when voltage difference Vdrop is more than corresponding voltage threshold VTH,
Representing the power on cable cable 50 and/or connector has been more than upper limit 1W, thus can be determined as cable and/or connector whereby
Abnormal (it is, cable too high in resistance and/or connector too high in resistance).In one embodiment, voltage threshold VTH above-mentioned can
It is calculated by the upper limit of the power and transmission electric current ID or load current ILD, and in another embodiment, voltage threshold above-mentioned
VTH can obtain (such as according to relationship between above-mentioned voltage difference and electric current) by searching for table (lookup table).
Referring to Fig. 4, showing an embodiment (power transmission device 4) signal of power transmission device of the invention in figure
Figure, power transmission device 4 is similar with the embodiment power transmission device 2 of Fig. 2, is different in power transmission device 4, electricity
Influenza slowdown monitoring circuit is located in load unit 20 (that is, load current sensing circuit 23), to sense load current ILD, and by this
Information is supplied to load control circuit 21, in addition, in the present embodiment, to switch the transmission circuit of the power supply as conducting or not lead
Logical power switch, as shown, be located in load unit 20 (that is, power switch SWL), in the present embodiment, load control electricity
Road 21 determines voltage threshold VTH according to load current ILD, and according to the voltage difference for sending voltage VD and load voltage VLD
Whether Vdrop is greater than voltage threshold VTH, and judges whether cable or connector (namely connecting interface 60) are abnormal,
In one embodiment, can when connecting interface 60 is abnormal, control power switch SWL be not turned on (such as by control believe
Number VCL).In one embodiment, when voltage difference Vdrop is greater than voltage threshold VTH, load control circuit 21 controls power switch
SWL is to be not turned on.And in one embodiment, before load control circuit 21 controls power switch SWL to be not turned on, send control
Circuit 11 processed can first downgrade transmission voltage VD and/or load control circuit 21 first downgrades load current ILD, so that on cable 50
Power can be reduced thus；And in one embodiment, process is downgraded by above-mentioned, downgrades a minimum voltage when sending voltage VD
When level and/or load current ILD have downgraded a minimum current level, load control circuit 21 controls power switch SWL and is
It is not turned on.In the present embodiment, sending controling circuit 11 or load control circuit 21 can be read by communication interface ITF and send voltage
VD, load current ILD, load voltage VLD at least one of, to realize calculating or operation above-mentioned.
Referring to Fig. 5, showing an embodiment (power transmission device 5) signal of power transmission device of the invention in figure
Figure, power transmission device 5 is similar with the embodiment power transmission device 2 of Fig. 2, is different in power transmission device 5, electricity
Influenza slowdown monitoring circuit is located in power supply transmission unit 10 and load unit 20 (that is, sending current sensing circuit 13 and load current sense
Slowdown monitoring circuit 23), electric current ID and load current ILD is sent to sense respectively, and provide this information to sending controling circuit 11
Or load control circuit 21, in addition, the transmission circuit to switch the power supply is the power for being connected or being not turned in the present embodiment
Switch, as shown, being located in power supply transmission unit 10 and load unit 20 (that is, power switch SWD and SWL), the present embodiment
In, sending controling circuit 11 or load control circuit 21 can determine voltage threshold according to electric current ID or load current ILD is sent
VTH, and whether voltage threshold VTH is greater than according to the voltage difference Vdrop for sending voltage VD and load voltage VLD, and judge cable
Whether line or connector (namely connecting interface 60) are abnormal, and in one embodiment, can occur in connecting interface 60 different
Chang Shi, controlling power switch SWD and power switch SWL respectively is to be not turned on.In one embodiment, when voltage difference Vdrop is greater than
When voltage threshold VTH, it is to be not turned on that sending controling circuit 11, which controls power switch SWD, in one embodiment, works as voltage difference
When Vdrop is greater than voltage threshold VTH, it is to be not turned on that load control circuit 21, which controls power switch SWL,.
And in one embodiment, before power switch SWL or SWD control is are not turned on, sending controling circuit 11 can be first
Downgrade and send voltage VD and/or load control circuit 21 and first downgrade load current ILD so that the power on cable 50 can thus drop
It is low；And in one embodiment, process is downgraded by above-mentioned, when transmission voltage VD downgrades a lowest voltage level and/or bears
When load electric current ILD has downgraded a minimum current level, sending controling circuit 11 or load control circuit 21 control power respectively
Switch SWD and/or SWL are to be not turned on.In the present embodiment, sending controling circuit 11 or load control circuit 21 can be connect by communication
Mouthful ITF read send voltage VD, load current ILD, load voltage VLD and load current ILD at least one of, with reality
Existing calculating or operation above-mentioned.
By the above embodiments (power transmission device 2,4 and 5) it is found that according to the present invention, by cable and connector (or
The connecting interface of any other form) voltage at both ends and the sensing of electric current, it can directly or indirectly obtain on cable and connector
Power dissipation, and according to the upper limit of a preset power dissipation of cable and connector and electric current ID or load electricity can be sent
Flow ILD, and determine a voltage threshold VTH, to send voltage VD compared with the voltage difference Vdrop of load voltage VLD, and it is true
Determine the exception of cable Yu connector (namely connecting interface), and carries out downgrading voltage, electric current or control power switch as aforementioned
The protections operation such as it is not turned on.In addition, the details operation of above-mentioned power transmission device 4 and 5 can also refer to the operational flowchart of Fig. 6 A,
It will not be described here.
In some cases, it possibly can not be communicated between power supply transmission unit and load unit, such as, but not limited to power supply
Transmission unit is the power supply adaptor that traditional type exports fixed voltage, therefore power supply transmission unit and can not to sense transmission in real time electric
Pressure sends electric current, and intercourses information with load unit with communication interface communication, however spirit according to the present invention, herein
In the case of, the detection of cable Yu connector exception can be still carried out, details is as follows.Referring to Fig. 7, showing electricity of the invention in figure
An embodiment (power transmission device 7) schematic diagram of source transmitting device, and shown please refer to Fig. 6 B, Fig. 6 B and correspond to Fig. 7
The operational flowchart of middle power transmission device of the invention；4 class of embodiment power transmission device of power transmission device 7 and Fig. 4
Seemingly, it is different in power transmission device 7, power supply transmission unit 10 ' is not communicated with load unit 20, however electric
The voltage level VL for sending voltage VD and there is a default of source transmission unit 10 ', wherein the voltage level of " default ", can be
One fixed value (such as, but not limited to 5V), or be an adjustable variable value, similarly hereinafter；In the present embodiment, current sensing circuit
In load unit 20 (that is, load current sensing circuit 23), to sense load current ILD, in addition, to switch the electricity
The transmission circuit in source is the power switch for being connected or being not turned on, as shown, also being located in load unit 20 (that is, power switch
SWL)；Whether load control circuit 21 determines voltage threshold VTH ' according to load current ILD, and low according to load voltage VLD
(correspond in Fig. 6 B, step S3 and S4) in voltage threshold VTH ', and judges cable or connector (namely connecting interface 60)
Whether it is abnormal, in one embodiment, can be when connecting interface 60 be abnormal, controlling power switch SWL is to be not turned on；
Wherein voltage threshold VTH ' is relevant to the voltage level VL of default, for example, VTH '=VL-ILD*RTH, wherein RTH be
The upper limit value of Rdrop=Ra+Rb+Rc, it is therefore, aforementioned whether to have the judgement being abnormal for a viewpoint, it also can be considered root
Whether it is greater than resistance threshold RTH according to Rdrop and determines and (correspond in Fig. 6 B, step S3 and S4).In one embodiment, work as load
Voltage VLD be lower than voltage threshold VTH ' when, load control circuit 21 control power switch SWL be not turned on (correspond to Fig. 6 B in,
Step S4 and S8), with protection power source transmitting device, in addition, as shown in Figure 6B, it in one embodiment, can be by above-mentioned judgement knot
Fruit (such as load voltage VLD is lower than voltage threshold VTH '), returns user, to warn the exception of cable and connector.And
In one embodiment, before load control circuit 21 controls power switch SWL to be not turned on, load control circuit 21 can be downgraded first
Load current ILD so that power on cable 50 and connector 30 and 40 can thus reduce and (correspond in Fig. 6 B, step S9)；
And in one embodiment, process (corresponding in Fig. 6 B, step S7) is downgraded by above-mentioned, when load current ILD has been downgraded
When one minimum current level, it is to be not turned on and (correspond in Fig. 6 B, step S8) that load control circuit 21, which controls power switch SWL,
With protection power source transmitting device.
As previously mentioned, another common cable is to have additional electricity between conducting wire or contact extremely with connector
Flow path, in the case, spirit according to the present invention can still be detected by sending the current difference of electric current and load current
The exception stated.
Referring to Fig. 8, showing an embodiment (power transmission device 8) signal of power transmission device of the invention in figure
Figure, and the operational flowchart for corresponding to power transmission device of the invention in Fig. 8 is shown please refer to Figure 10, Figure 10；Power supply
Transmitting device 8 is similar with the embodiment power transmission device 5 of Fig. 5, is different in power transmission device 8, sends voltage
Sensing circuit can be omitted with load voltage sense circuit.In the present embodiment, current sensing circuit be located at power supply transmission unit 10 and
In load unit 20 (that is, sending current sensing circuit 13 and load current sensing circuit 23), respectively to sense transmission electric current
ID and load current ILD, in addition, the transmission circuit to switch the power supply is the power switch for being connected or being not turned on, as schemed institute
Show, is located in power supply transmission unit 10 and load unit 20 (that is, power switch SWD and SWL), sending controling circuit 11 or load
With a current difference ILK of load current ILD whether to be greater than a current threshold ITH (corresponding according to electric current ID is sent for control circuit 21
In Figure 10, step S3 and S4), and judge whether cable or connector (namely connecting interface 60) are abnormal, one
, can be when connecting interface 60 be abnormal in embodiment, can control power switch SWD and power switch SWL respectively is to be not turned on
(corresponding in Figure 10, step S4 and S7), with protection power source transmitting device.In one embodiment, current threshold ITH can be for for example
50mA.In one embodiment, when current difference ILK is greater than current threshold ITH, sending controling circuit 11 controls power switch SWD
To be not turned on, in one embodiment, when current difference ILK is greater than current threshold ITH, load control circuit 21 controls power switch
SWL is to be not turned on, with protection power source transmitting device.In the present embodiment, sending controling circuit 11 or load control circuit 21 can lead to
It crosses communication interface ITF and reads load current ILD and/or load current ILD, to realize calculating or operation above-mentioned.
Referring to Fig. 9, showing an embodiment (power transmission device 9) signal of power transmission device of the invention in figure
Figure, power transmission device 9 is similar with the embodiment power transmission device 8 of Fig. 8, is different in power transmission device 9, bears
Carrying current sensing circuit can omit.In the present embodiment, it is to be not turned on that load control circuit 21, which controls the bearing power switch SWL,
And at this time sending controling circuit 11 according to sending whether electric current ID is greater than a current threshold ITH, and judge cable or connector (
It is exactly connecting interface 60) whether it is abnormal, in one embodiment, it can control and send when connecting interface 60 is abnormal
Power switch SWD is to be not turned on.It should be noted that in other embodiments, bearing power switch SWL can not be to be controlled by load
The control of circuit 21 and be not turned on, but when causing to be not turned on due to other reasons, can still carry out above-mentioned abnormal judgement.This reality
It applies in example, since when bearing power switch SWL is to be not turned on, load current ILD is 0, therefore, if sending electric current ID is greater than one
Current threshold ITH is then represented and be there is such as, but not limited to foreign matter or short between the conducting wire of cable or between the pin of connector
Road etc. is abnormal, thus the present embodiment remains to the exception of detection cable 50 and connector 30 and 40 without load sense.?
In one embodiment, when bearing power switch SWL is is not turned on, and sends electric current ID greater than current threshold ITH, it is electric to send control
It is to be not turned on that the control of road 11, which sends power switch SWD, with protection power source transmitting device.In one embodiment, sending controling circuit
11 and load control circuit 21 by communication interface ITF synchronized loading power switch SWL are the period being not turned on.
Illustrated by embodiment above-mentioned it is found that according to the present invention it is possible to without temperature sensor, can cable with connect
Have when excessively high power dissipation on device (namely connecting interface) and carry out protection operation, and avoids cable and connector temperature
It spends height or burns.
Illustrate the present invention for preferred embodiment above, but described above, is only easy to those skilled in the art
Understand the contents of the present invention, interest field not for the purpose of limiting the invention.Illustrated each embodiment, however it is not limited to individually
Using can also be with combined application；Wherein an example is lifted, it is " according to the voltage difference for sending voltage and load voltage " and " electric according to sending
Flow the current difference with load current " it can be used together, make power transmission device while there are this two kinds of detectabilities, thus can determine
Cable and the various forms of exceptions of connector.In addition, under same spirit of the invention, it may occur to persons skilled in the art that respectively
Kind of equivalence changes and various combinations, for example, the control of " power switch " and " voltage sensing " or " current sense " and
It is calculated, and can be implemented in different units, and for example, by taking the embodiment of aforementioned Fig. 2 as an example, it is single that power switch can be located at load
Member, and after sending controling circuit 11 reads load voltage VLD by interface ITF, by sending controling circuit 11 by logical
Power switch control is switched to be not turned on by letter interface ITF notification payload control circuit 21；In the case where above-mentioned be used in combination, power supply is passed
Defeated device may include the physical circuit of previous embodiment, to realize the combination of aforesaid operations or circuit.In another example alleged by the present invention
" according to certain signal carry out processing operation or generate certain output result ", be not limited to according to the signal itself, being also contained in must
When wanting, which is subjected to Voltage to current transducer, Current Voltage conversion and/or ratio conversion etc., later according to the letter after conversion
It number carries out processing or operation generates certain output result.It follows that those skilled in the art can under same spirit of the invention
To expect various equivalence changes and various combinations, a combination thereof mode is a lot of, explanation numerous to list herein.Therefore, of the invention
Range should cover above-mentioned and other all equivalence changes.
Claims (15)
1. a kind of power transmission device, which is characterized in that include：
One power supply transmission unit, to generate a power supply, wherein the power supply has one to send voltage in the power supply transmission unit end
And provide one and send electric current, which includes：
One sending controling circuit, to control the transmission voltage and the transmission electric current；And
One sends voltage sensing circuit, to sense the transmission voltage and provide this information to the sending controling circuit；
One load unit is coupled to the power supply transmission unit to receive the power supply, and generates a load current and a load electricity
Pressure, wherein the power supply transmission unit and the load unit form a power delivery loops, which includes：
One load control circuit, to control the load voltage and the load current；And
One load voltage sense circuit, to sense the load voltage and provide this information to the load control circuit；
One connecting interface is located on the power delivery loops, to couple the power supply transmission unit and the load unit, and whereby
Transmit the power supply；
An at least power switch is located on the power delivery loops, to switch the transmission circuit of the power supply as conducting or not lead
It is logical；
An at least current sensing circuit, to sense the transmission electric current and/or the load current；And
One communication interface, to be communicated between the power supply transmission unit and the load unit；
Wherein the sending controling circuit or the load control circuit determine a voltage according to the transmission electric current or the load current
Threshold value, and whether the voltage threshold is greater than according to a voltage difference of the transmission voltage and the load voltage, and judge whether there is hair
It is raw abnormal.
2. power transmission device according to claim 1, wherein when the voltage difference is greater than the voltage threshold, the transmission
It is to be not turned on that control circuit or the load control circuit, which control the power switch,.
3. power transmission device according to claim 1, wherein when the voltage difference is greater than the voltage threshold, the transmission
Control circuit downgrades the transmission voltage and/or the load control circuit downgrades the load current.
4. power transmission device according to claim 3, wherein when the transmission voltage downgrades a lowest voltage level
And/or the load current, when downgrading a minimum current level, the sending controling circuit or the load control circuit control the function
Rate switch is to be not turned on.
5. power transmission device according to claim 1, wherein the sending controling circuit or the load control circuit pass through
The communication interface read the transmission voltage, the transmission electric current, the load voltage and the load current at least one of.
6. a kind of power transmission device, which is characterized in that include：
One power supply transmission unit, to generate a power supply, wherein the power supply has one to send voltage in the power supply transmission unit end,
The transmission voltage has the voltage level of a default；And
One load unit is coupled to the power supply transmission unit to receive the power supply, and generates a load current and a load electricity
Pressure, wherein the power supply transmission unit and the load unit form a power delivery loops, which includes：
One load control circuit, to control the load voltage and the load current；
One load voltage sense circuit to sense the load voltage, and provides this information to the load control circuit；
One load current sensing circuit to sense the load current, and provides this information to the load control circuit；
One connecting interface is located on the power delivery loops, to couple the power supply transmission unit and the load unit, and whereby
Transmit the power supply；And
One power switch, to switch the transmission circuit of the power supply as conducting or be not turned on；
Whether wherein the load control circuit determines a voltage threshold according to the load current, and be less than according to the load voltage
The voltage threshold, and judge whether there is and be abnormal.
7. power transmission device according to claim 6, wherein when the load voltage is less than the voltage threshold, the hair
Sending control circuit or the load control circuit to control the power switch is to be not turned on.
8. power transmission device according to claim 6, wherein when the load voltage is less than the voltage threshold, this is negative
It carries control circuit and downgrades the load current.
9. power transmission device according to claim 8, wherein when the load current downgrades a minimum current level
When, it is to be not turned on which, which controls the power switch,.
10. a kind of power transmission device, which is characterized in that include：
One power supply transmission unit, to generate a power supply, wherein the power supply has one to send voltage in the power supply transmission unit end
And provide one and send electric current, which includes：
One sending controling circuit, to control the transmission voltage and the transmission electric current；And
One sends current sensing circuit, to sense the transmission electric current, and provides this information to the sending controling circuit；
One load unit is coupled to the power supply transmission unit to receive the power supply, and generates a load current, and wherein the power supply is sent out
Unit and the load unit is sent to form a power delivery loops, which includes：
One load control circuit, to control the load current；And
One load current sensing circuit to sense the load current, and provides this information to the load control circuit；
One connecting interface is located on the power delivery loops, to couple the power supply transmission unit and the load unit, and whereby
Transmit the power supply；
An at least power switch is located on the power delivery loops, to switch the transmission circuit of the power supply as conducting or not lead
It is logical；And
One communication interface, to be communicated between the power supply transmission unit and the load unit；
Wherein the sending controling circuit or the load control circuit are according to a current difference of the transmission electric current and the load current
It is no to be greater than a current threshold, and judge whether there is and be abnormal.
11. power transmission device according to claim 10, wherein when the current difference is greater than the current threshold, the hair
Sending control circuit or the load control circuit to control the power switch is to be not turned on.
12. power transmission device according to claim 10, wherein the sending controling circuit or the load control circuit are logical
It crosses the communication interface and reads the transmission electric current and/or the load current.
13. a kind of power transmission device, which is characterized in that include：
One power supply transmission unit, to generate a power supply, wherein the power supply has one to send voltage in the power supply transmission unit end
And provide one and send electric current, which includes：
One sending controling circuit；And
One sends current sensing circuit, to sense the transmission electric current, and provides this information to the sending controling circuit；
One sends power switch, is controlled by the sending controling circuit and switchs the transmission voltage and/or the transmission electric current；
One load unit receives the power supply, and generates a load current, including：
One load control circuit, to control the load current；And
One bearing power switch, is controlled by the load control circuit and switchs the load current；And
One connecting interface is located on the power delivery loops, to couple the power supply transmission unit and the load unit, and whereby
Transmit the power supply；
Wherein when judging bearing power switch to be not turned on, whether a current threshold is greater than according to the transmission electric current, and is sentenced
It is disconnected whether to be abnormal.
14. power transmission device according to claim 13, wherein when bearing power switch is is not turned on, and the hair
When power transmission stream is greater than the current threshold, it is to be not turned on which, which controls the transmission power switch,.
15. power transmission device according to claim 13, wherein further include a communication interface, to be sent out in the power supply
It send and is communicated between unit and the load unit, wherein the sending controling circuit is connect with the load control circuit by the communication
Mouth synchronizes bearing power switch as the period being not turned on.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201762479311P | 2017-03-30 | 2017-03-30 | |
| US62/479,311 | 2017-03-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108919871A true CN108919871A (en) | 2018-11-30 |
Family
ID=64403170
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710887837.6A Withdrawn CN108919871A (en) | 2017-03-30 | 2017-09-27 | power transmission device |
| CN201810076561.8A Pending CN108957037A (en) | 2017-03-30 | 2018-01-26 | power transmission device and its method |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810076561.8A Pending CN108957037A (en) | 2017-03-30 | 2018-01-26 | power transmission device and its method |
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| CN (2) | CN108919871A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112736842A (en) * | 2020-12-17 | 2021-04-30 | 联合汽车电子有限公司 | Multi-mode intelligent electronic fuse and control method thereof |
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| US5617007A (en) * | 1994-08-17 | 1997-04-01 | International Business Machines Corporation | Battery charging method and apparatus using current control |
| US20030071602A1 (en) * | 2001-08-13 | 2003-04-17 | Toshizumi Ando | Power supply apparatus |
| EP2264855A2 (en) * | 2003-02-21 | 2010-12-22 | Research In Motion Limited | Circuit and method of operation for an adaptive charge rate power supply |
| US20140239885A1 (en) * | 2013-02-27 | 2014-08-28 | System General Corporation | Control circuit for charging battery through programmable power supplier |
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| CN108957037A (en) | 2018-12-07 |
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