CN109100810B - Foreign matter detection method and power supply system with foreign matter detection function - Google Patents
Foreign matter detection method and power supply system with foreign matter detection function Download PDFInfo
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- CN109100810B CN109100810B CN201810348859.XA CN201810348859A CN109100810B CN 109100810 B CN109100810 B CN 109100810B CN 201810348859 A CN201810348859 A CN 201810348859A CN 109100810 B CN109100810 B CN 109100810B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
- G01V3/104—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils
- G01V3/105—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils forming directly coupled primary and secondary coils or loops
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
Abstract
The invention provides a foreign matter detection method and a power supply system with a foreign matter detection function. The power supply system with the foreign matter detection function comprises a power supply end, a power receiving end and a cable. The power supply terminal includes: a power supply, a foreign object detection control circuit and a pull-up circuit. The power supply provides a supply voltage to the power receiving end according to a power supply control signal. The foreign matter detection control circuit generates a power supply control signal to control the power supply, and generates a foreign matter detection control signal according to the voltage of the power supply transmission node of the power supply end, so as to judge whether foreign matters exist at the power receiving end. The pull-up circuit adaptively adjusts the level of the supply current provided by the self-powered transmission node to the power receiving end according to the foreign object detection control signal.
Description
Technical Field
The present invention relates to a foreign object detection method and a power system having a foreign object detection function, and more particularly, to a foreign object detection method and a power system having a foreign object detection function, which can adaptively adjust a level of a supply current provided from a power transmission node of a power supply terminal to a power receiving terminal by detecting whether a foreign object exists at the power receiving terminal, thereby preventing the power receiving terminal from being corroded or damaged.
Background
Referring to fig. 1A, a schematic diagram of a power supply system in the prior art is shown. Please refer to fig. 1B, which illustrates a schematic diagram of an abnormal state of a power system in the prior art. Please refer to fig. 1C, which is a schematic diagram illustrating another abnormal state of the prior art power system.
As shown in fig. 1A to 1C, the prior art power systems 100a, 100b and 100C each include a power supply 10, a cable 70 and an electronic device 20. In the prior art power systems 100a, 100b and 100c, the power supply 10 and the electronic device 20 are coupled to each other via a cable 70. The power supply 10 includes at least one power converter (not shown). The electronic device 20 includes at least one load (not shown). The cable 70 includes a positive power transmission line 71, a negative power transmission line 73, and a signal transmission line 72. When the power supply 10 (serving as a power supply terminal) and the electronic device 20 (serving as a power receiving terminal) are coupled to each other via the cable 70, the positive power transmission line 71 and the negative power transmission line 73 form a loop to transmit power.
The above description is common to the prior art power systems 100a, 100b, and 100C shown in FIGS. 1A-1C.
However, the power systems 100a, 100b and 100c of the prior art are different in that the resistors of the respective electronic devices 20 are different from each other in their composition.
When a foreign object (for example, but not limited to, a liquid such as a solid or moisture) or corrosion exists on a current path for signal transmission or exists between transmission lines, the equivalent resistance is changed, and the present invention detects the change of the equivalent resistance, determines the existence of the foreign object or the corrosion, and prevents the foreign object or the corrosion.
In the presence of foreign matter in the electronic device 20, such as but not limited to moisture, electrolyte, solid foreign matter or corrosion on the port or between the ports where the electronic device 20 is connected to the signal transmission line 72 of the cable 70, there is a possibility that an abnormal resistance value may occur on the port or between the transmission lines at the end of the electronic device 20 receiving the power transmission node CCR, which may be equivalently represented by the foreign matter resistance Rf or the contact resistance Rcont. In the above abnormal situation, if the power supply 10 continuously outputs high level current to the electronic device 20, the port or the transmission line will be damaged due to heat generation, or the port or the transmission line will be continuously corroded due to the electrolytic reaction in the humid environment, which may cause danger or damage to the electronic device 20 when the corrosion condition is more serious. The aforementioned abnormal conditions may have a variety of failure modes, which are described below by way of example.
As shown in fig. 1A, in the electronic device 20 of the power supply system 100a in the prior art, since the foreign object resistor Rf or the abnormal contact resistor Rcont at the port is connected in series to the pull-down resistor Rd, an abnormally high resistance value may occur at the end of the power receiving transmission node CCR of the electronic device 20, which may be higher than the resistance value range of the transmission interface specification (such as, but not limited to, USB PD).
As shown in fig. 1B, the electronic device 20 of the power supply system 100B of the related art has a contact resistor Rcont and a pull-down resistor Rd connected in series with each other, and a foreign object resistor Rf short-circuited to ground. In this case, the equivalent resistance of the side of the power transmission node CCR may be higher or lower than the resistance value range of the transmission interface specification.
As shown in fig. 1C, the electronic device 20 of the prior art power supply system 100C has a contact resistor Rcont and a pull-down resistor Rd connected in series with each other, and a foreign object resistor Rf short-circuited to the supply voltage VBUS. In this case, the equivalent resistance at the end of the power transfer node CCR may result in a range of voltage values that are higher or lower than the transmission interface specification.
CCR in prior art power systems 100a, 100b, and 100c, if not handling such abnormal conditions, burnout or continued corrosion may occur, which when more severe may cause danger or damage to electronic device 20.
Accordingly, the present invention is directed to overcome the deficiencies and drawbacks of the prior art, and to provide a method for detecting a foreign object and a power system having a foreign object detection function, which can adaptively adjust a level of a supply current provided from a power transmission node of a power supply terminal to a power receiving terminal by detecting whether a foreign object exists at the power receiving terminal, thereby preventing the power receiving terminal from being corroded or damaged.
Disclosure of Invention
In order to achieve the above objects, in one aspect, the present invention provides a foreign object detection method for detecting whether a foreign object exists at a power receiving end between the power receiving end and the power supplying end, the power supplying end and the power receiving end being connected by a cable, the cable including a positive power transmission line, a negative power transmission line and a signal transmission line, wherein the power supplying end has a power supplying transmission node, the power receiving end has a power receiving transmission node, and the signal transmission line transmits a transmission signal between the power supplying transmission node and the power receiving transmission node, the foreign object detection method comprising: (A) providing a low current at the power supply transmission node, and judging whether a voltage of the power supply transmission node of the power supply end is higher than or equal to a first voltage; (B1) if the determination in step (a) is yes, indicating that the power supply terminal and the power receiving terminal are not coupled to each other, then step (B2) is performed; (B2) providing the low current to the power receiving terminal from the power supply transmission node of the power supply terminal; (C) when the determination of step (a) is negative, it represents that the power supply terminal and the power receiving terminal are "primarily" determined to be coupled to each other, and at this time, a high current is provided from the power supply transmission node of the power supply terminal to the power receiving terminal, wherein the level of the high current is greater than the level of the low current; (D) under the premise that the power supply end and the power receiving end are preliminarily judged to be in a mutually coupled state and the high current is provided from the power supply transmission node of the power supply end to the power receiving end, judging whether the voltage of the power supply transmission node of the power supply end is between a second voltage and a third voltage again, wherein the level of the first voltage is greater than that of the second voltage, the level of the second voltage is greater than that of the third voltage, and the level of the third voltage is greater than zero; (E) when the step (D) is yes, it represents that the power supply terminal and the power receiving terminal are "indeed" judged to be coupled to each other, and at this time, the high current is continuously supplied from the power supply transmission node of the power supply terminal to the power receiving terminal; and (F1) when the judgment in the step (D) is negative, the foreign matter exists at the power receiving end, and then the step (F2) is carried out; (F2) the low current is provided to the power receiving end from the power supply transmission node of the power supply end, so that the power receiving end is prevented from being corroded or damaged.
In a preferred embodiment, the step (F2) of providing the low current from the power transmission node of the power supply terminal to the power receiving terminal includes: and providing a constant low current to the power receiving end from the power supply transmission node of the power supply end.
In a preferred embodiment, the step (F2) of providing the low current from the power transmission node of the power supply terminal to the power receiving terminal includes: and providing a pulse type current to the power receiving end from the power supply transmission node of the power supply end.
In a preferred embodiment, on the premise that the power receiving end has foreign matter and the low current is provided to the power receiving end from the power supply transmission node of the power supply end: (G) and judging whether the voltage of the power supply transmission node of the power supply end is higher than or equal to the first voltage again.
In a preferred embodiment, when the determination of step (G) is yes, it represents that the power supply terminal and the power receiving terminal are not coupled to each other, and then the process returns to step (B2).
In a preferred embodiment, when the determination in step (G) is negative, it indicates that there is a foreign object at the power receiving end, and then the process returns to step (F2).
In a preferred embodiment, on the premise that the power supply terminal and the power receiving terminal are "indeed" determined to be in a coupled condition with each other and the high current is continuously provided from the power supply transmission node of the power supply terminal to the power receiving terminal: (H) determining whether power delivery communication (power delivery communication) between the power supply end and the power receiving end is failed.
In a preferred embodiment, when the determination in step (H) is yes, indicating that there is a foreign object at the power receiving end, the process returns to step (F2).
In another aspect, the present invention provides a power supply system with a foreign object detection function, comprising: a power supply terminal, the power supply terminal is connected with a power receiving terminal through a cable, wherein the cable includes a positive power transmission line, a negative power transmission line and a signal transmission line, the power system is used for detecting whether there is a foreign object at the power receiving terminal, wherein the power supply terminal has a power supply transmission node, the power receiving terminal has a power receiving transmission node, the signal transmission line transmits a transmission signal between the power supply transmission node and the power receiving transmission node, the power supply terminal includes: a power converter, which provides a supply voltage to the power receiving end according to a power supply control signal;
the foreign matter detection control circuit generates the power supply control signal to control the power converter, and generates a foreign matter detection control signal according to a voltage of the power supply transmission node of the power supply end, so as to judge whether foreign matters exist at the power receiving end; and a pull-up circuit for adaptively adjusting a level of a supply current provided from the power supply transmission node of the power supply terminal to the power receiving terminal according to the foreign object detection control signal.
In a preferred embodiment, the foreign object detection control circuit includes: a transmission voltage detection circuit for detecting the voltage of the power transmission node of the power supply terminal to generate a power transmission voltage level signal; and an adjusting circuit for generating the foreign object detection control signal according to the power transmission voltage level signal.
In a preferred embodiment, the pull-up circuit includes: a pull-up voltage source for providing a pull-up voltage; and a pull-up current source for adaptively adjusting a level of the supply current provided from the power supply transmission node of the power supply terminal to the power receiving terminal according to the foreign object detection control signal.
In a preferred embodiment, the pull-up circuit includes: a pull-up voltage source for providing a pull-up voltage; and a pull-up resistor for adaptively adjusting a level of the supply current provided from the power supply transmission node of the power supply terminal to the power receiving terminal according to the foreign object detection control signal.
In a preferred embodiment, the method for determining whether a foreign object exists at the power receiving end by the foreign object detection control circuit generating the foreign object detection control signal according to the voltage of the power transmission node at the power supply end comprises the following steps: (A) providing a low current at the power supply transmission node, and judging whether the voltage of the power supply transmission node of the power supply end is higher than or equal to a first voltage by the transmission voltage detection circuit; (B1) if the determination in step (a) is yes, indicating that the power supply terminal and the power receiving terminal are not coupled to each other, then step (B2) is performed; (B2) the pull-up circuit provides the low current to the power receiving terminal from the power supply transmission node of the power supply terminal; (C) when the determination of step (a) is negative, it represents that the power supply terminal and the power receiving terminal are "primarily" determined to be coupled to each other, and at this time, the pull-up circuit provides a high current from the power supply transmission node of the power supply terminal to the power receiving terminal, wherein the level of the high current is greater than the level of the low current; (D) under the premise that the power supply terminal and the power receiving terminal are preliminarily judged to be in a mutually coupled state and the pull-up circuit provides the high current from the power supply transmission node of the power supply terminal to the power receiving terminal, the transmission voltage detection circuit judges whether the voltage of the power supply transmission node of the power supply terminal is between a second voltage and a third voltage again, wherein the level of the first voltage is greater than that of the second voltage, the level of the second voltage is greater than that of the third voltage, and the level of the third voltage is greater than zero; (E) when the step (D) is yes, it represents that the power supply terminal and the power receiving terminal are "indeed" determined to be coupled to each other, and at this time, the pull-up circuit continues to maintain the high current supplied from the power supply transmission node of the power supply terminal to the power receiving terminal; and (F1) when the judgment in the step (D) is negative, the foreign matter exists at the power receiving end, and then the step (F2) is carried out; (F2) the pull-up circuit provides the low current to the power receiving end from the power supply transmission node of the power supply end, so that the power receiving end is prevented from being corroded or damaged.
In a preferred embodiment, the pull-up circuit of step (F2) providing the low current from the power transmission node of the power terminal to the power receiving terminal comprises: the pull-up circuit provides a constant low current to the power receiving end from the power supply transmission node of the power supply end.
In a preferred embodiment, the pull-up circuit of step (F2) providing the low current from the power transmission node of the power terminal to the power receiving terminal comprises: the pull-up circuit provides a pulse-type current to the power receiving end from the power supply transmission node of the power supply end.
In a preferred embodiment, on the premise that the power receiving end has a foreign object and the pull-up circuit provides the low current to the power receiving end from the power supply transmission node of the power supply end: (G) the transmission voltage detection circuit judges whether the voltage of the power supply transmission node of the power supply end is higher than or equal to the first voltage again.
In a preferred embodiment, when the determination of step (G) is yes, it represents that the power supply terminal and the power receiving terminal are not coupled to each other, and then the process returns to step (B2).
In a preferred embodiment, when the determination in step (G) is negative, it indicates that there is a foreign object at the power receiving end, and then the process returns to step (F2).
In a preferred embodiment, on the premise that the power supply terminal and the power receiving terminal are "indeed" determined to be coupled to each other and the pull-up circuit continues to provide the high current from the power supply transmission node of the power supply terminal to the power receiving terminal: (H) determining whether power delivery communication (power delivery communication) between the power supply terminal and the power receiving terminal is failed.
In a preferred embodiment, when the determination in step (H) is yes, indicating that there is a foreign object at the power receiving end, the process returns to step (F2).
In another aspect, the present invention provides a foreign object detection method for detecting whether a foreign object exists at a power receiving end between a power supplying end and a power receiving end, the power supplying end and the power receiving end being connected by a cable, the cable including a positive power transmission line, a negative power transmission line and a signal transmission line, wherein the power supplying end has a power supplying transmission node, the power receiving end has a power receiving transmission node, and the signal transmission line transmits a transmission signal between the power supplying transmission node and the power receiving transmission node, the foreign object detection method comprising the steps of: providing a low current at the power delivery node; and when judging whether the power receiving end is coupled with the power supply end and no foreign object exists, providing a high current at the power supply transmission node, otherwise, continuously providing the low current at the power supply transmission node to avoid corrosion.
In a preferred embodiment, the step of determining whether the power receiving terminal is coupled to the power supplying terminal and no foreign object exists includes: judging whether a voltage of the power supply transmission node is within a voltage range; when the voltage of the power supply transmission node is within the voltage range, judging that the power receiving end is coupled with the power supply end and no foreign object exists; and when the voltage of the power supply transmission node exceeds the voltage range, judging that the power receiving end is not coupled with the power supply end or foreign matter exists.
The purpose, technical content, features and effects of the invention will be more easily understood through the following detailed description of specific embodiments.
Drawings
Fig. 1A depicts a schematic diagram of a prior art power supply system.
FIG. 1B is a schematic diagram of an abnormal state of a prior art power system.
FIG. 1C is a schematic diagram of another abnormal state of a prior art power supply system.
Fig. 2A is a block diagram illustrating an embodiment of a power system with a foreign object detection function according to the present invention.
Fig. 2B is a block diagram illustrating a power supply system with a foreign object detection function according to another embodiment of the present invention.
Fig. 3A shows an embodiment of a foreign object detection control circuit of the present invention and an embodiment of a pull-up circuit of the present invention.
Fig. 3B shows an embodiment of a foreign object detection control circuit of the present invention and another embodiment of a pull-up circuit of the present invention.
Fig. 4 is a flowchart illustrating steps of an embodiment of a method for detecting a foreign object according to the present invention.
FIG. 5A illustrates an embodiment of the first, second, and third voltages of the present invention.
FIG. 5B illustrates an embodiment of the first, second, and third voltages of the present invention.
FIG. 6 shows an embodiment of a pulsed current of the present invention.
Detailed Description
The foregoing and other technical and other features and advantages of the invention will be apparent from the following detailed description of a preferred embodiment, which proceeds with reference to the accompanying drawings. The drawings in the present application are schematic and are intended to show functional relationships between devices and elements, and the circuits, signal waveforms and frequencies are not drawn to scale.
Please refer to fig. 2A and compare fig. 4. Fig. 2A is a block diagram illustrating an embodiment of a power system with a foreign object detection function according to the present invention. Fig. 4 is a flowchart illustrating steps of an embodiment of a method for detecting a foreign object according to the present invention.
As shown in fig. 2A, the method for detecting a foreign object of the present embodiment can be applied to, for example, but not limited to, a power system 200 with a function of detecting a foreign object. The power system 200 with the function of detecting foreign objects of the present embodiment includes a power supply terminal 10, a cable 70 and a power receiving terminal 20. The power supply terminal 10 and the power receiving terminal 20 are coupled to each other via a cable 70 to transmit power from the power supply terminal 10 to the power receiving terminal 20. In the present embodiment, the cable 70 includes a positive power transmission line 71, a negative power transmission line 73, and a signal transmission line 72. In the embodiment, the power supply terminal 10 has a power supply transmission node CCS, the power receiving terminal 20 has a power receiving transmission node CCR, and the signal transmission line 72 transmits a transmission signal CC between the power supply transmission node CCS and the power receiving transmission node CCR.
In one embodiment, the power system 200 may be, for example, a power system conforming to the USB PD (Universal Serial bus power Delivery) transmission interface specification, and the power supply transmission node CCS, the power receiving transmission node CCR and the transmission signal CC correspond to the CC (configuration channel) of the USB PD. Of course, the spirit of the present invention is not limited thereto.
The present invention can detect whether there is a foreign object at the receiving end 20 (as shown in fig. 4); when the foreign object is detected at the power receiving terminal 20, in one embodiment, the power system 200 with the foreign object detection function can adaptively reduce the level of a supply current Ic provided from the power transmission node CCS of the power supply terminal 10 to the power receiving terminal 20. In another embodiment, when the foreign object is detected at the power receiving end 20, the power system 200 with the foreign object detection function can send out a warning signal, or stop supplying power from the power supply end 10 to the power receiving end 20; when the power receiving terminal 20 is in a normal condition (i.e. when there is no foreign object at the power receiving terminal 20), the power system 200 with the foreign object detection function can provide power from the power supply terminal 10 to the power receiving terminal 20 (details and features of the method for determining whether there is a foreign object at the power receiving terminal 20 in the present embodiment will be described later).
As shown in fig. 2A, in an embodiment, the power supply terminal 10 may be, for example and without limitation, a power supply (hereinafter, the power supply terminal 10 is referred to as the power supply 10), and the power receiving terminal 20 may be, for example and without limitation, an electronic device (hereinafter, the power receiving terminal 20 is referred to as the electronic device 20). The power supply 10 includes a power converter 11, a foreign object detection control circuit 12, and a pull-up circuit 13.
The power converter 11 provides a supply voltage VBUS to the power receiving terminal 20 according to a power supply control signal CTL. The power converter 11 can be, for example, various types of switching power converters (switching power regulators), and the present invention can be applied to any of them.
The foreign object detection control circuit 12, on the one hand, generates a power supply control signal CTL to control the power converter 11. On the other hand, the foreign object detection control circuit 12 generates a foreign object detection control signal S2 according to a voltage Vccs of the power transmission node CCS of the power supply terminal 10, so as to determine whether the foreign object exists at the power receiving terminal 20 (details and features of how the foreign object detection control circuit 12 determines whether the foreign object exists at the power receiving terminal 20, which will be described later).
The pull-up circuit 13 adaptively adjusts the level of a supply current Ic provided from the power supply transmission node CCS of the power supply terminal 10 to the power receiving terminal 20 according to the foreign object detection control signal S2 (details and characteristics of how the pull-up circuit 13 adaptively adjusts the level of a supply current Ic provided from the power supply transmission node CCS of the power supply terminal 10 to the power receiving terminal 20 when the condition that the foreign object exists in the power receiving terminal 20 is detected, which will be described later).
Referring to fig. 2B, a block diagram of a power system with a foreign object detection function according to another embodiment of the invention is shown. In this embodiment, the foreign object detection control circuit 12 may not control the power converter 11.
Please refer to fig. 3A and compare fig. 2A. Fig. 3A shows an embodiment of a foreign object detection control circuit of the present invention and an embodiment of a pull-up circuit of the present invention.
As shown in fig. 3A, the foreign object detection control circuit 12 includes a transmission voltage detection circuit 121 and an adjustment circuit 122. The transmission voltage detecting circuit 121 is configured to detect a voltage Vccs of the power transmission node CCS of the power supply terminal 10 to generate a power transmission voltage level signal S1. The adjusting circuit 122 is used for generating a foreign object detection control signal S2 according to the power transmission voltage level signal S1.
As shown in fig. 3A, in one embodiment, the pull-up circuit 13 includes a pull-up voltage source Vp and a pull-up current source Ip. The pull-up voltage source Vp is used for providing a pull-up voltage. The pull-up current source Ip is configured to adaptively adjust a level of the supply current Ic provided from the power transmission node CCS of the power supply terminal 10 to the power receiving terminal 20 according to the foreign object detection control signal S2.
In another embodiment, as shown in fig. 3B, the pull-up circuit 13 includes a pull-up voltage source Vp and a pull-up resistor Rp. The pull-up voltage source Vp is used for providing a pull-up voltage. The pull-up resistor Rp is used to adaptively adjust the level of the supply current Ic provided from the power transmission node CCS of the power supply terminal 10 to the power receiving terminal 20 according to the foreign object detection control signal S2, for example, by adjusting the pull-up resistor Rp.
In addition, in the present embodiment, the electronic device 20 includes a load 21. When the power supply 10 (i.e., any power supply terminal) and the electronic device 20 (i.e., any power receiving terminal) are coupled to each other via the cable 70, the power transmission lines (71 and 73) can transmit power, i.e., the supply voltage VBUS is transmitted from the power converter 11 disposed at the power supply terminal 10 to the load 21 disposed at the power receiving terminal 20, so that the power supply terminal 10 can be regarded as a power supply transmitting terminal and the power receiving terminal 20 can be regarded as a power receiving terminal.
In the present embodiment, the foreign object detection control circuit 12 generates the foreign object detection control signal S2 according to the voltage Vccs of the power supply transmission node CCS of the power supply terminal 10, thereby determining whether a foreign object exists at the power receiving terminal 20.
Please refer to fig. 4 and compare fig. 2A, fig. 5A and fig. 5B. FIG. 5A illustrates an embodiment of the first, second, and third voltages of the present invention. FIG. 5B illustrates an embodiment of the first, second, and third voltages of the present invention.
In the present embodiment, as shown in step S11 of fig. 4, a low current is provided at the power transmission node CCS (such as, but not limited to, the low current may be provided from the pull-up current source Ip as shown in fig. 3A). The transmission voltage detecting circuit 121 of the foreign object detection control circuit 12 determines whether the voltage Vccs of the power transmission node CCS of the power supply terminal 10 is higher than or equal to a first voltage (step S12 shown in fig. 4). In one embodiment, the first voltage may be, for example, but not limited to, bV as shown in FIG. 5A. In one embodiment, the first voltage may be, for example, but not limited to, 4V as shown in FIG. 5B. That is, in the embodiment, the transmission voltage detection circuit 121 of the foreign object detection control circuit 12 determines whether the voltage Vccs of the power transmission node CCS of the power supply terminal 10 is higher than or equal to a first voltage (e.g., whether the voltage Vccs is higher than or equal to 4V).
It should be noted that the 4V shown in fig. 5B is only for illustration and is not intended to limit the scope of the present invention. In other embodiments, the first voltage may have any other value.
When the determination of step S12 in fig. 4 is yes, which represents that the power supply terminal 10 and the power receiving terminal 20 are not coupled to each other (step S21 in fig. 4), at this time, the pull-up circuit 13 provides a low current (i.e., the supply current Ic) from the power supply transmission node CCS of the power supply terminal 10 to the power receiving terminal 20 (step S22 in fig. 4). In an embodiment, when the power supply terminal 10 and the power receiving terminal 20 are not coupled to each other, the supply current Ic output by the power supply terminal 10 is a low current. In one embodiment, the level of the supply current Ic can be, for example, but not limited to, 1 μ A.
It should be noted that the level of the supply current Ic is only for illustration and is not used to limit the scope of the present invention. In other embodiments, the level of the supply current Ic may be any other value. The term "decoupled status" refers to the determination of the voltage Vccs of the power transmission node CCS of the power supply terminal 10 by the transmission voltage detection circuit 121 of the foreign object detection control circuit 12, and the electrical connection relationship between the power supply terminal 10 and the power receiving terminal 20 is determined to be, for example, but not limited to, an open circuit or a state in which the resistance exceeds a certain maximum value (for example, but not limited to, 4 mega ohm).
When the determination of step S12 in fig. 4 is no, which means that the power supply terminal 10 and the power receiving terminal 20 are "primarily" determined to be coupled to each other (step S13 in fig. 4), the pull-up circuit 13 provides a high current (i.e., the supply current Ic) from the power supply transmission node CCS of the power supply terminal 10 to the power receiving terminal 20 (step S14 in fig. 4). In one embodiment, when the power supply terminal 10 and the power receiving terminal 20 are determined to be in the coupled condition, "preliminary", the supply current Ic outputted by the power supply terminal 10 is a high current. In one embodiment, the level of the supply current Ic can be, for example, but not limited to 330 μ A. Wherein the level of the high current (for example, but not limited to 330 μ A) is greater than the level of the low current (for example, but not limited to 1 μ A).
It should be noted that the level of the supply current Ic is only for illustration and is not used to limit the scope of the present invention. In other embodiments, the level of the supply current Ic may be any other value. The high current 330 μ A illustrated in this embodiment may correspond to one of the CC pin current source specifications of the USB PD, for example, and in other embodiments it may correspond to other current levels of the CC pin current source specification of the USB PD, for example, 180 μ A or 80 μ A. Of course, other types of transmission interface specifications are possible in accordance with the spirit of the present invention.
On the premise that the power supply terminal 10 and the power receiving terminal 20 are preliminarily determined to be coupled to each other and the pull-up circuit 30 provides a high current (i.e. the supply current Ic, for example, but not limited to 330 μ a) from the power supply transmission node CCS of the power supply terminal 10 to the power receiving terminal 20, the transmission voltage detection circuit 121 of the foreign object detection control circuit 12 determines again whether the voltage Vccs of the power supply transmission node CCS of the power supply terminal 10 is between a second voltage and a third voltage (step S15 shown in fig. 4).
In one embodiment, the second voltage may be, for example, but not limited to, cV as shown in fig. 5A. In one embodiment, the second voltage may be, for example, but not limited to, 2.6V as shown in fig. 5B. In one embodiment, the third voltage may be, for example, but not limited to, dV as shown in fig. 5A. In one embodiment, the third voltage may be, for example, but not limited to, 0.8V as shown in FIG. 5B. That is, in the embodiment, the transmission voltage detection circuit 121 of the foreign object detection control circuit 12 determines whether the voltage Vccs of the power transmission node CCS of the power supply terminal 10 is between a second voltage and a third voltage (e.g., whether the voltage Vccs is between 0.8V and 2.6V).
It should be noted that the 0.8V and 2.6V shown in fig. 5B are only for illustration and are not intended to limit the scope of the present invention. In other embodiments, the second voltage and the third voltage may have any other values.
In the embodiment, the level of the first voltage (for example, but not limited to, 4V) is greater than the level of the second voltage (for example, but not limited to, 2.6V), the level of the second voltage (for example, but not limited to, 2.6V) is greater than the level of the third voltage (for example, but not limited to, 0.8V), and the level of the third voltage (for example, but not limited to, 0.8V) is greater than zero.
When the determination of step S15 shown in fig. 4 is yes (i.e., when the voltage Vccs is between 0.8V and 2.6V) (please refer to fig. 5A and 5B), which means that the power supply terminal 10 and the power receiving terminal 20 are "indeed" determined to be coupled to each other (as shown in step S16 shown in fig. 4), the pull-up circuit 30 continues to maintain the power supply transmission node CCS of the power supply terminal 10 providing the high current (i.e., the supply current Ic, for example, but not limited to, may be 330 μ a) to the power receiving terminal 20 (as shown in step S17 shown in fig. 4).
The exemplary voltage Vccs range for determining that the power supply terminal 10 and the power receiving terminal 20 are "actually" coupled to each other in this embodiment, i.e. the range between 0.8V and 2.6V, may correspond to one of the CC pin voltage threshold specifications of the USB PD, for example, in other embodiments, it may also correspond to other threshold ranges of the CC pin voltage threshold of the USB PD, such as the range between 0.4V and 1.6V (i.e. the second voltage is 1.6V and the third voltage is 0.4V) or the range between 0.2V and 1.6V (i.e. the second voltage is 1.6V and the third voltage is 0.2V). Of course, other types of transmission interface specifications are possible in accordance with the spirit of the present invention.
When the answer of step S15 shown in fig. 4 is no (i.e., when the voltage Vccs is between 0.8V and 0V or when the voltage Vccs is between 4V and 2.6V) (please refer to fig. 5A and 5B), it represents that there is a foreign object at the power receiving terminal 20, and at this time, the pull-up circuit 30 provides a low current from the power transmission node CCS of the power supply terminal 10 to the power receiving terminal 20, thereby preventing the power receiving terminal 20 from being corroded or damaged. The term "supplying a low current" is used to reduce the level of the original supply current Ic from 330 μ A to 1 μ A (step S18A shown in FIG. 4).
It is noted that in the present invention, two embodiments of "providing low current" are possible. In one embodiment, if the level of the original supply current Ic is to be decreased from 330 μ a to 1 μ a (step S18A shown in fig. 4), the level of the supply current Ic provided by the pull-up current source Ip can be decreased according to the invention shown in fig. 3A.
Alternatively, in another embodiment, if the level of the original supply current Ic is to be decreased from 330 μ a to 1 μ a (step S18A shown in fig. 4), according to fig. 3B, the present invention can increase the resistance of the pull-up resistor Rp, thereby decreasing the level of the supply current Ic provided by the entire pull-up circuit 13.
In the present embodiment, in order to prevent the power receiving terminal 20 from rusting, the present invention has a function of detecting whether there is a foreign object at the power receiving terminal 20. For example, when the voltage Vccs is between 0.8V and 0V or when the voltage Vccs is between 4V and 2.6V, it represents that there is a foreign object at the power receiving terminal 20. In this case, the invention provides a corresponding solution, that is: the pull-up circuit 30 provides a low current to the power receiving terminal 20 from the power supply transmission node CCS of the power supply terminal 10, and reduces the supply current Ic by one to several powers, so as to effectively slow down the corrosion speed or the possibility of occurrence of burning. In the present embodiment, when the voltage Vccs is between 0.8V and 0V, it may correspond to the case where the foreign object is present in fig. 1C, for example and without limitation, and when the voltage Vccs is between 4V and 2.6V, it may correspond to the case where the foreign object is present in fig. 1A or 1B, for example and without limitation.
In one embodiment, the pull-up circuit 30 provides a constant low current to the power receiving terminal 20 instead of providing a low current to the power transmitting node CCS of the power providing terminal 10. That is, the level of the original supply current Ic is lowered from 330 μ a to 1 μ a (step S18A shown in fig. 4).
Alternatively, in another embodiment, as shown in fig. 6, the pull-up circuit 30 provides, for example, but not limited to, a pulse-like current to the power receiving terminal 20 from the power transmission node CCS of the power supply terminal 10 (step S18B shown in fig. 4). As shown in fig. 6, when the voltage Vccs is between 0.8V and 0V or when the voltage Vccs is between 4V and 2.6V, it indicates that foreign matter exists at the power receiving terminal 20. In this case, the pull-up circuit of the present invention may supply the supply current Ic from the power supply transmission node CCS of the power supply terminal 10 to the power receiving terminal 20 for, for example, but not limited to, only 10ms, and at the next 990ms, the pull-up circuit 30 may temporarily stop supplying the supply current Ic from the power supply transmission node CCS of the power supply terminal 10 to the power receiving terminal 20. Thereafter, the pull-up circuit resumes the supply current Ic provided from the supply transmission node CCS of the power supply terminal 10 to the power receiving terminal 20, for example, but not limited thereto, may be supplied for only 10 ms. By providing, for example, but not limited to, a pulse-type current from the power transmission node CCS of the power supply terminal 10 to the power receiving terminal 20, the average value of the supply current Ic will be lower than the original high level of 330 μ a, and likewise, the corrosion speed or the possibility of occurrence of, for example, burning out can be effectively reduced.
In one embodiment, a foreign object is present at the power receiving terminal 20 and the pull-up circuit 30 provides a low current from the power transmission node CCS of the power supply terminal 10 (for example: on the premise of reducing the level of the original supply current Ic from 330 μ a to 1 μ a to the power receiving terminal 20, the transmission voltage detection circuit 121 of the foreign object detection control circuit 12 can determine again whether the voltage Vccs of the power transmission node CCS of the power supply terminal 10 is higher than or equal to the first voltage (as shown in step S19 shown in fig. 4), in an embodiment, the first voltage may be, for example and without limitation, bV. shown in fig. 5A. in an embodiment, the first voltage may be, for example and without limitation, 4v shown in fig. 5B. that is, in the embodiment, the transmission voltage detection circuit 121 of the foreign object detection control circuit 12 can determine whether the voltage Vccs of the power transmission node CCS of the power supply terminal 10 is higher than or equal to a first voltage (for example: it may again be determined whether voltage Vccs is greater than or equal to 4V).
When the determination of step S19 shown in fig. 4 is yes, which represents that the power supply terminal 10 and the power receiving terminal 20 are not coupled to each other (step S21 shown in fig. 4), at this time, the pull-up circuit 30 continues to maintain the supply of the low current from the power supply transmission node CCS of the power supply terminal 10 to the power receiving terminal 20 (step S22 shown in fig. 4).
Although the power supply terminal 10 and the power receiving terminal 20 are "actually" determined to be in the coupled condition with each other in the case that the foreign object exists in the power receiving terminal 20 (as shown in step S16 of fig. 4), whether the power supply terminal 10 and the power receiving terminal 20 are still in the coupled condition with each other can be confirmed twice by the determination of step S19 of the present embodiment. For example: in the case where a foreign object exists at the power receiving terminal 20, the transmission voltage detection circuit 121 of the foreign object detection control circuit 12 can determine whether the voltage Vccs is higher than or equal to 4V again. Once the determination of step S19 shown in fig. 4 is yes, it represents that the power supply terminal 10 and the power receiving terminal 20 are changed from the original coupled condition to the uncoupled condition.
In the case that the foreign object exists at the power receiving terminal 20 and the power supplying terminal 10 and the power receiving terminal 20 are "actually" determined to be in the coupled condition with each other (as shown in step S16 of fig. 4), whether the foreign object still exists at the power supplying terminal 10 and the power receiving terminal 20 can be confirmed two degrees (or continuously in a loop) by the determination of step S19 of the present embodiment. When the determination of step S19 shown in fig. 4 is no, it indicates that foreign matter is still present at the power receiving terminal 20. Therefore, the power system 200 with the function of detecting the foreign object in the embodiment can return to step S18A and/or step S18B shown in fig. 4, at this time, the pull-up circuit 30 continues to maintain the power transmission node CCS of the power supply terminal 10 providing the low current (i.e. the supply current Ic) to the power receiving terminal 20, thereby continuing to prevent the power receiving terminal 20 from being corroded or damaged. As mentioned above, in one embodiment, the level of the supply current Ic can be, for example, but not limited to, 1 μ A.
In an embodiment, on the premise that the power supply terminal 10 and the power receiving terminal 20 are "actually" determined to be coupled to each other (as shown in step S16 in fig. 4) (i.e., when the voltage Vccs is between 0.8V and 2.6V, please refer to fig. 5A and 5B) and the pull-up circuit 30 continues to maintain the high current provided from the power transmission node CCS of the power supply terminal 10 to the power receiving terminal (as shown in step S17 in fig. 4), the power supply system 200 with the foreign object detection function of the embodiment may determine whether the power transmission communication (power transmission communication) between the power supply terminal 10 and the power receiving terminal 20 fails (as shown in step S20 in fig. 4). The "power transmission communication" may correspond to, for example, the USB PD specification, regarding the power supply/receiving capability and requirement of the power supply terminal 10 and the power receiving terminal 20 communicating with each other through the CC pin, and the power supply terminal 10 provides a specific voltage and/or current to the power receiving terminal 20 after the protocol is implemented.
When the determination of step S20 in fig. 4 is that the power source system 200 with the foreign object detection function of the embodiment returns to step S18A and/or step S18B in fig. 4, at this time, the pull-up circuit 30 provides a low current from the power transmission node CCS of the power supply terminal 10 to the power receiving terminal 20, thereby preventing the power receiving terminal 20 from being corroded or damaged.
The term "supplying a low current" is used to reduce the level of the original supply current Ic from 330 μ A to 1 μ A (step S18A shown in FIG. 4).
It is noted that, although the voltage Vccs is between the second voltage and the third voltage (e.g., between 0.8V and 2.6V), it represents that no foreign object exists at the power receiving end 20. However, the present invention has an advantage of preventing the determination of step S16 in fig. 4 as "false positive", that is, for example, in the case of multiple foreign object paths (for example, but not limited to the case of the presence of a foreign object in fig. 1B or 1C), although the range of the voltage Vccs is still determined to be within the normal range (for example, between 0.8V and 2.6V), since the foreign object is actually present, the power transmission communication between the power supply terminal 10 and the power receiving terminal 20 may fail, and therefore, the present invention can further determine the presence or absence of the foreign object, and improve the capability of detecting the foreign object.
Therefore, by the determination of step S20 shown in fig. 4, it can be confirmed whether or not the power receiving terminal 20 does not actually have any foreign matter present. When the determination of step S20 shown in fig. 4 is yes, which represents that the power supply system 200 with the foreign object detection function of the present embodiment determines that the power transmission communication (power transmission communication) between the power supply terminal 10 and the power receiving terminal 20 has failed (as shown in step S20 shown in fig. 4), so that the power supply system 200 with the foreign object detection function of the present embodiment can adopt a corresponding solution, i.e., return to step S18A and/or step S18B shown in fig. 4, at this time, the pull-up circuit 30 provides a low current from the power transmission node CCS of the power supply terminal 10 to the power receiving terminal 20, thereby preventing the power receiving terminal 20 from being corroded or damaged.
Referring to fig. 2A, in an embodiment, when the power receiving end 20 determines that a foreign object exists, the foreign object detection control circuit 12 may control the power converter 11 to stop outputting the supply voltage VBUS, for example, to prevent a large current from being output to the transmission interface with the foreign object or moisture existing and causing damage.
In summary, from one aspect, the method for detecting a foreign object of the present invention can be summarized as the following steps: providing a low current (e.g., a supply current Ic at a level of 1 μ A) at the supply transfer node CCS; and when it is determined whether the power receiving terminal 20 is coupled to the power supply terminal 10 and no foreign object exists, a high current (for example, the level of the supply current Ic is 330 μ a) is provided at the power transmission node CCS, otherwise, a low current (i.e., 1 μ a) is continuously provided at the power transmission node CCS to prevent corrosion. In one embodiment, the step of determining whether the power receiving terminal 20 is coupled to the power supplying terminal 10 and no foreign object exists includes: judging whether a voltage Vccs of the power supply transmission node CCS is within a voltage range; when the voltage Vccs of the power transmission node CCS is within a voltage range (e.g., the range from cV to dV), it is determined that the power receiving terminal 20 is coupled to the power supply terminal 10 and no foreign object exists; and when the voltage of the power transmission node CCS exceeds the voltage range, determining that the power receiving terminal 20 is not coupled to the power supply terminal 10 or a foreign object exists.
The present invention has been described with respect to the preferred embodiments, but the above description is only for the purpose of making the content of the present invention easy to understand for those skilled in the art, and is not intended to limit the scope of the present invention. Equivalent variations will occur to those skilled in the art, within the same spirit of the invention. For example, circuit elements, such as switches, may be interposed between the directly connected circuit elements as shown, without affecting the primary function of the circuit. All of which can be analogized to the teachings of the present invention. In addition, the embodiments described are not limited to a single application, and may be combined, for example, but not limited to, a combination of both embodiments. Accordingly, the scope of the present invention should be determined to encompass all such equivalent variations as described above. Furthermore, it is not necessary for any embodiment of the invention to achieve all of the objects or advantages, and thus, any one of the claims should not be limited thereby.
Claims (24)
1. A foreign object detection method is used for detecting whether a foreign object exists at a power receiving end between the power supplying end and the power receiving end, the power supplying end is connected with the power receiving end through a cable, the cable comprises a positive power transmission line, a negative power transmission line and a signal transmission line, wherein the power supplying end is provided with a power supplying transmission node, the power receiving end is provided with a power receiving transmission node, the signal transmission line transmits a transmission signal between the power supplying transmission node and the power receiving transmission node, and the foreign object detection method comprises the following steps:
(A) providing a low current at the power supply transmission node, and judging whether a voltage of the power supply transmission node of the power supply end is higher than or equal to a first voltage;
(B1) if the determination in step (a) is yes, indicating that the power supply terminal and the power receiving terminal are not coupled to each other, then step (B2) is performed; (B2) providing the low current to the power receiving terminal from the power supply transmission node of the power supply terminal;
(C) when the determination of step (a) is negative, it represents that the power supply terminal and the power receiving terminal are "primarily" determined to be coupled to each other, and at this time, a high current is provided from the power supply transmission node of the power supply terminal to the power receiving terminal, wherein the level of the high current is greater than the level of the low current;
(D) under the premise that the power supply end and the power receiving end are preliminarily judged to be in a mutually coupled state and the high current is provided from the power supply transmission node of the power supply end to the power receiving end, judging whether the voltage of the power supply transmission node of the power supply end is between a second voltage and a third voltage again, wherein the level of the first voltage is greater than that of the second voltage, the level of the second voltage is greater than that of the third voltage, and the level of the third voltage is greater than zero;
(E) when the step (D) is yes, it represents that the power supply terminal and the power receiving terminal are "indeed" judged to be coupled to each other, and at this time, the high current is continuously supplied from the power supply transmission node of the power supply terminal to the power receiving terminal; and
(F1) if the judgment in the step (D) is no, indicating that foreign matter exists at the power receiving end, then the process proceeds to a step (F2);
(F2) the low current is provided to the power receiving end from the power supply transmission node of the power supply end, so that the power receiving end is prevented from being corroded or damaged.
2. The method of claim 1, wherein the low current is a constant current, and the level of the constant current is lower than the level of the high current.
3. The method of claim 1, wherein the low current is a pulsed current, and the average level of the pulsed current is lower than the level of the high current.
4. The method of claim 1, wherein if a foreign object is present at the power receiving end and the low current is provided from the power transmission node of the power supply end to the power receiving end:
(G) and judging whether the voltage of the power supply transmission node of the power supply end is higher than or equal to the first voltage again.
5. The method of claim 4, wherein when the determination in step (G) is positive, it represents that the power supply terminal and the power receiving terminal are not coupled to each other, and then the operation returns to step (B2).
6. The method for detecting a foreign object as claimed in claim 4, wherein when the determination in step (G) is negative, which indicates that a foreign object exists at the power receiving end, the method returns to step (F2).
7. The method of claim 1, wherein if the power supply terminal and the power receiving terminal are determined to be coupled to each other and the high current is continuously provided from the power transmission node of the power supply terminal to the power receiving terminal:
(H) and judging whether the power transmission communication between the power supply end and the power receiving end fails or not.
8. The method for detecting a foreign object as claimed in claim 7, wherein when the step (H) is yes, it represents that a foreign object exists at the power receiving end, and then the step (F2) is performed.
9. A power system with a foreign object detection function includes:
a power supply terminal, the power supply terminal is connected with a power receiving terminal through a cable, wherein the cable includes a positive power transmission line, a negative power transmission line and a signal transmission line, the power system with foreign object detection function can detect whether the power receiving terminal has a foreign object, wherein the power supply terminal has a power supply transmission node, the power receiving terminal has a power receiving transmission node, the signal transmission line transmits a transmission signal between the power supply transmission node and the power receiving transmission node, the power supply terminal includes:
a power converter, which provides a supply voltage to the power receiving end according to a power supply control signal;
the foreign matter detection control circuit generates the power supply control signal to control the power converter, and generates a foreign matter detection control signal according to a voltage of the power supply transmission node of the power supply end, so as to judge whether foreign matters exist at the power receiving end; and
a pull-up circuit for adaptively adjusting a level of a supply current provided from the power supply transmission node of the power supply terminal to the power receiving terminal according to the foreign object detection control signal.
10. The power supply system having a foreign object detection function according to claim 9, wherein the foreign object detection control circuit includes:
a transmission voltage detection circuit for detecting the voltage of the power transmission node of the power supply terminal to generate a power transmission voltage level signal; and
an adjusting circuit for generating the foreign object detection control signal according to the power transmission voltage level signal.
11. The power supply system having a foreign object detection function according to claim 9, wherein the pull-up circuit includes:
a pull-up voltage source for providing a pull-up voltage; and
a pull-up current source for adaptively adjusting a level of the supply current provided from the power supply transmission node of the power supply terminal to the power receiving terminal according to the foreign object detection control signal.
12. The power supply system having a foreign object detection function according to claim 9, wherein the pull-up circuit includes:
a pull-up voltage source for providing a pull-up voltage; and
a pull-up resistor for adaptively adjusting a level of the supply current provided from the power supply transmission node of the power supply terminal to the power receiving terminal according to the foreign object detection control signal.
13. The power system with a function of detecting foreign objects as claimed in claim 10, wherein the method for determining whether a foreign object exists at the power receiving end by the foreign object detection control circuit generating the foreign object detection control signal according to the voltage of the power transmission node at the power supplying end comprises the following steps:
(A) providing a low current at the power transmission node, wherein the transmission voltage detection circuit determines whether the voltage of the power transmission node of the power supply terminal is higher than or equal to a first voltage, and the low current corresponds to a low level of the supply current;
(B1) if the determination in step (a) is yes, indicating that the power supply terminal and the power receiving terminal are not coupled to each other, then step (B2) is performed;
(B2) the pull-up circuit provides the low current to the power receiving terminal from the power supply transmission node of the power supply terminal;
(C) when the determination of step (a) is negative, it represents that the power supply terminal and the power receiving terminal are "primarily" determined to be coupled to each other, and at this time, the pull-up circuit provides a high current from the power supply transmission node of the power supply terminal to the power receiving terminal, where the high current corresponds to a high level of the supply current, and the level of the high current is greater than the level of the low current;
(D) under the premise that the power supply terminal and the power receiving terminal are preliminarily judged to be in a mutually coupled state and the pull-up circuit provides the high current from the power supply transmission node of the power supply terminal to the power receiving terminal, the transmission voltage detection circuit judges whether the voltage of the power supply transmission node of the power supply terminal is between a second voltage and a third voltage again, wherein the level of the first voltage is greater than that of the second voltage, the level of the second voltage is greater than that of the third voltage, and the level of the third voltage is greater than zero;
(E) when the step (D) is yes, it represents that the power supply terminal and the power receiving terminal are "indeed" determined to be coupled to each other, and at this time, the pull-up circuit continues to maintain the high current supplied from the power supply transmission node of the power supply terminal to the power receiving terminal; and
(F1) if the judgment in the step (D) is no, indicating that foreign matter exists at the power receiving end, then the process proceeds to a step (F2);
(F2) the pull-up circuit provides the low current to the power receiving end from the power supply transmission node of the power supply end, so that the power receiving end is prevented from being corroded or damaged.
14. The power system with function of detecting alien materials according to claim 13, wherein the low current is a constant current having a level lower than that of the high current.
15. The power system with a function of detecting a foreign object as claimed in claim 13, wherein the low current is a pulse-like current, and an average level of the pulse-like current is lower than that of the high current.
16. The power system with a function of detecting a foreign object as claimed in claim 13, wherein if a foreign object is present at the power receiving end and the pull-up circuit provides the low current to the power receiving end from the power transmission node of the power supply end:
(G) the transmission voltage detection circuit judges whether the voltage of the power supply transmission node of the power supply end is higher than or equal to the first voltage again.
17. The power system with a function of detecting a foreign object as claimed in claim 16, wherein when the determination in step (G) is yes, it represents that the power supply terminal and the power receiving terminal are not coupled to each other, and then the process returns to step (B2).
18. The power system with a function of detecting a foreign object as claimed in claim 16, wherein when the determination in step (G) is negative, which indicates that a foreign object exists at the power receiving end, the process returns to step (F2).
19. The power system with detecting alien substances as claimed in claim 13, wherein, on the premise that the power terminal and the power receiving terminal are "indeed" determined to be coupled to each other and the pull-up circuit continues to provide the high current from the power transmission node of the power terminal to the power receiving terminal:
(H) and judging whether the power transmission communication between the power supply end and the power receiving end fails or not.
20. The power supply system with a foreign object detection function according to claim 19, wherein when the determination in step (H) is yes, which indicates that a foreign object exists at the power receiving end, the process returns to step (F2).
21. A foreign object detection method is used for detecting whether a foreign object exists at a power receiving end between the power supplying end and the power receiving end, the power supplying end is connected with the power receiving end through a cable, the cable comprises a positive power transmission line, a negative power transmission line and a signal transmission line, wherein the power supplying end is provided with a power supplying transmission node, the power receiving end is provided with a power receiving transmission node, the signal transmission line transmits a transmission signal between the power supplying transmission node and the power receiving transmission node, and the foreign object detection method comprises the following steps:
providing a low current at the power delivery node; and
judging whether the power receiving end is coupled with the power supply end and no foreign object exists,
when the power receiving end is coupled with the power supply end and no foreign object exists, a high current is provided at the power supply transmission node, otherwise, the low current is continuously provided at the power supply transmission node to avoid corrosion.
22. The method of claim 21, wherein the step of determining whether the power receiving terminal is coupled to the power supplying terminal and no foreign object exists comprises:
judging whether a voltage of the power supply transmission node is within a voltage range;
when the voltage of the power supply transmission node is within the voltage range, judging that the power receiving end is coupled with the power supply end and no foreign object exists; and
when the voltage of the power supply transmission node exceeds the voltage range, the power receiving end is judged to be not coupled with the power supply end or foreign matter exists.
23. The method of claim 22, wherein the low current is a constant current, and the level of the constant current is lower than the level of the high current.
24. The method of claim 22, wherein the low current is a pulsed current, and the average level of the pulsed current is lower than the level of the high current.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15/996,516 US10705497B2 (en) | 2017-06-21 | 2018-06-03 | Foreign object detection method and power system capable of detecting foreign object |
| US16/882,500 US11137733B2 (en) | 2017-06-21 | 2020-05-24 | Foreign object detection method and power system capable of detecting foreign object |
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| US201762522943P | 2017-06-21 | 2017-06-21 | |
| US62/522,943 | 2017-06-21 |
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| CN114609938A (en) * | 2020-12-08 | 2022-06-10 | 瑞昱半导体股份有限公司 | Electronic device system and power supply transmission method |
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| CN105319475A (en) * | 2014-07-31 | 2016-02-10 | 立锜科技股份有限公司 | Abnormal connection detection method |
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