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WO2021120947A1 - 电源输出端的处理电路、电子设备与对地阻抗检测方法 - Google Patents

电源输出端的处理电路、电子设备与对地阻抗检测方法 Download PDF

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Publication number
WO2021120947A1
WO2021120947A1 PCT/CN2020/129079 CN2020129079W WO2021120947A1 WO 2021120947 A1 WO2021120947 A1 WO 2021120947A1 CN 2020129079 W CN2020129079 W CN 2020129079W WO 2021120947 A1 WO2021120947 A1 WO 2021120947A1
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WO
WIPO (PCT)
Prior art keywords
voltage
ground
impedance
power supply
output terminal
Prior art date
Application number
PCT/CN2020/129079
Other languages
English (en)
French (fr)
Inventor
陶红霞
Original Assignee
上海爻火微电子有限公司
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Filing date
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Application filed by 上海爻火微电子有限公司 filed Critical 上海爻火微电子有限公司
Publication of WO2021120947A1 publication Critical patent/WO2021120947A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/08—Measuring resistance by measuring both voltage and current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G01R27/18—Measuring resistance to earth, i.e. line to ground
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads

Definitions

  • the present invention relates to the field of power supply, in particular to a processing circuit, electronic equipment and a method for detecting impedance to ground at the output end of a power supply.
  • Electronic equipment may include electrical equipment and power supply equipment, and the power supply equipment can be connected to the electrical equipment by means of pluggable cables or fixedly connected cables.
  • the load can be regarded as the impedance to the ground of the power supply terminal.
  • the invention provides a processing circuit, an electronic device and a ground impedance detection method at the output end of a power supply, so as to solve the problem of potential safety hazards and dangers.
  • a processing circuit for a power output terminal which includes a first switch unit provided at a first voltage source and the power output terminal, and also includes a control unit, a second switch unit, and an adjustable current source Unit and a voltage detection unit; the adjustable current source unit and the second switch unit are connected in series between the second voltage source and the power output; the control unit is respectively connected to the adjustable current source unit, In the first switch unit, the second switch unit, and the voltage detection unit, the voltage of the first voltage source is greater than the voltage of the second voltage source;
  • the voltage detection unit is connected to the output terminal of the power supply via the second switch unit for detecting the voltage range in which the voltage of the output terminal of the power supply is located;
  • the control unit is used for:
  • the ground impedance range of the output end of the power supply is determined, wherein the different ground impedance ranges are related to the cause of the ground impedance At least two different impedance ranges to ground are determined according to different current values determined by the adjustment of the adjustable current source unit.
  • control unit is further configured to: when the first switch unit is kept off, control the on/off of the first switch unit and the second switch unit according to the impedance range to ground.
  • control unit controls the on-off of the first switch unit according to the impedance range to ground
  • it is specifically configured to implement at least one of the following:
  • the first switching unit is controlled to be turned on, the second switching unit is turned off, and the electrical equipment is connected to the ground.
  • Handshake communication
  • the first switch unit is controlled to remain off, and the The first switch unit is prohibited from being turned on.
  • the impedance range of the power supply output terminal to ground includes at least one of the following:
  • Impedance range at no-load which matches the impedance to ground at the output terminal of the power supply at no-load
  • the impedance range during short circuit which matches the impedance to ground when the power supply pin of the output terminal of the power supply or the cable connected to it is short-circuited to the ground or slightly short-circuited;
  • the impedance range when the external object is connected which matches the impedance to the ground when the external object is connected to the output terminal of the power supply and the ground;
  • the impedance range when the salt-containing liquid is connected which matches the impedance to ground when the salt-containing liquid is connected between the output terminal of the power supply and the ground;
  • the impedance range during leakage which matches the impedance to ground when leakage occurs at the power input terminal or the power supply pin of the cable connected to it, and the leakage current value is greater than the threshold;
  • the voltage detection unit includes a comparator; one input terminal of the comparator is used to connect to a reference voltage, and the other input terminal is connected to the power output terminal;
  • the control unit is also used to adjust the voltage value of the reference voltage, wherein the voltage value of the reference voltage is determined according to the upper limit value and/or the lower limit value of each voltage range, and at least two different impedances to ground The range is determined according to different reference voltages adjusted and determined.
  • control unit determines the impedance-to-ground impedance range of the output end of the power supply according to the different currents determined by the adjustment and the detected voltage range, it is specifically used for:
  • the voltage range of the power supply output terminal is greater than the maximum The voltage range of the target voltage of, then: determine the impedance range to ground where the impedance to ground of the output terminal of the power supply is located as the impedance range at no-load;
  • the voltage range of the power supply output terminal is less than the minimum For the voltage range of the target voltage, it is determined that the ground impedance range of the output terminal of the power supply is located as the impedance range during short-circuit.
  • adjusting the determined voltage value of the reference voltage includes at least two target voltage values, wherein the largest target voltage value is k times the smallest target voltage value, and k is greater than or equal to 10;
  • the current value determined by the adjustment includes at least two target current values, wherein the largest target current value is n times the smallest target current value, and n is greater than or equal to 1000.
  • the current value determined by the adjustment includes at least two target current values
  • control unit adjusts and determines the current value of the current output by the second voltage source to the output terminal of the power supply through the adjustable current source unit, it is specifically configured to:
  • the current value of the current is adjusted to the at least two target current values sequentially from large to small, wherein the adjustment of the current value is implemented periodically.
  • a method for detecting impedance to ground at the output end of a power supply which is applied to a control unit in a processing circuit at the output end of the power supply.
  • the processing circuit includes The first switch unit, the second switch unit and the second voltage source, the voltage of the first voltage source is greater than the voltage of the second voltage source; the method includes:
  • the ground impedance range of the output end of the power supply is determined, wherein the different ground impedance ranges are related to the cause of the ground impedance At least two different impedance ranges to ground are determined according to different current values determined by adjustment.
  • an electronic device including the processing circuit of the power output end involved in the first aspect and its optional solutions.
  • the voltage can be used when the first switch unit is controlled to be turned off (that is, when the power supply terminal is not supplying external power at a higher voltage required)
  • the smaller second voltage source supplies power to the power supply terminal
  • the voltage detection unit is used to detect the voltage at the power supply terminal during power supply.
  • the ground impedance of the power supply terminal can be effectively detected based on the detection result. It can be seen that the present invention can detect the impedance to ground before the first voltage source supplies power to the outside, thereby helping to prevent potential safety hazards and dangers caused by powering the outside when the impedance to ground is abnormal, and provide a basis for avoiding potential safety hazards and dangers.
  • the present invention by adjusting the current output from the second voltage source to the power supply terminal of the power supply in the present invention, it is convenient to accurately determine the current impedance-to-ground impedance range within a larger impedance-to-ground span. Furthermore, due to different pairs of The ground impedance range is related to the cause of the ground impedance, and the present invention can also be understood as being able to judge the cause of the ground impedance, thereby facilitating timely and accurate response.
  • FIG. 1 is a first structural diagram of a processing circuit at the output end of a power supply in an embodiment of the present invention
  • FIG. 2 is a schematic diagram of the structure of a voltage detection unit, a control unit and a power output terminal in an embodiment of the present invention
  • Fig. 3 is a second structural diagram of a processing circuit at the output end of a power supply in an embodiment of the present invention.
  • Fig. 4 is a first schematic diagram of a flow chart of a method for detecting impedance to ground in an embodiment of the present invention
  • FIG. 5 is a schematic diagram of the second flow of a method for detecting impedance to ground in an embodiment of the present invention.
  • FIG. 1 is a first structural diagram of a processing circuit at the output end of a power supply in an embodiment of the present invention.
  • the processing circuit involved in this embodiment may be an integrated chip or a functional module inside an integrated chip, and any circuit that can satisfy the following description does not depart from the description of this embodiment.
  • the processing circuit can be understood as a circuit in the power supply device. At the same time, this embodiment does not exclude the situation that it is distributed in different devices.
  • the processing circuit of the power output terminal includes a first switch unit 12 provided at the first voltage source 11 and the power output terminal 13. It can be understood as a circuit form for the power supply terminal in the related art. In the specific implementation process, other devices can be connected in series and/or in parallel. As long as the above description is satisfied, regardless of whether other devices are configured, they will not deviate from this Description of the embodiment.
  • the power output terminal 13 can be understood as: if the processing circuit is applied to a power supply device, the power supply terminal 13 can be an end that is fixedly or detachably connected to a cable or a power device (for example, it can also be understood as a power supply device).
  • the power supply pin), the structure of the power output terminal 13 may vary according to different power supply modes, for example, it may be a USB Type C interface.
  • the first switch unit 12 may be any device that can be turned on and off, for example, it may be a field effect transistor, which may also be characterized as a FET, which is an abbreviation of Field Effect Transistor.
  • the first voltage source can be understood as any device or a collection of devices that can provide direct current for the power supply of electric equipment, for example, it may be an AC-DC or DC-DC power supply device or a combination of devices in the power supply equipment.
  • the processing circuit of the power output terminal may further include a control unit 14, a second switch unit 18, an adjustable current source unit 17 and a voltage detection unit 15.
  • the adjustable current source unit 17 and the second switch unit 18 are connected in series between the second voltage source 16 and the power output terminal 13; further, when the first switch unit 18 is turned on, the second voltage source
  • the power supply of 16 can be delivered to the power output terminal 13, where the adjustable current source unit 17 can adjust the current during delivery.
  • the adjustable current source unit 17 may be any device or a collection of devices that can adjust the current generated by it based on the supplied voltage.
  • the adjustable current source unit 17 may include a second voltage in series.
  • the current source between the power source and the output terminal of the power supply; in another example, the adjustable current source unit 17 can also be implemented by using a pull-up resistor with controllable on-off.
  • it may include a resistance component, which may include multiple Parallel resistance branches, where different resistance branches can produce the same impedance or different impedances. By selecting the resistance branches that are turned on (including the case where multiple branches are turned on at the same time, it also includes the case where multiple branches are turned on at the same time). When a single branch is turned on), the current can also be adjusted.
  • the resistor can also be replaced with other devices.
  • this embodiment does not exclude other circuit units that can implement current adjustment.
  • the second switch unit 18 can be any device that can be turned on and off, for example, it can be an analog switch, which can be turned off when the first switch unit 12 is turned on for power supply, thereby avoiding the power supply during normal power supply.
  • the power supply of the output terminal 13 causes damage to the adjustable current source unit 17, that is, the second switch unit 18 can isolate the adjustable current source unit 17 from damage caused by the high voltage that may appear at the power output terminal 13.
  • the second switch unit 18 may be an analog switch capable of isolating high voltage.
  • the control unit 14 is respectively connected to the adjustable current source unit 17 and the voltage detection unit 15, as well as the first switch unit 12 and the second switch unit 18.
  • the voltage of the first voltage source 11 is greater than that of the second switch unit.
  • the voltage of the voltage source 16; the voltage of the second voltage source may be the low-voltage working voltage of the circuit, for example, 3.3V, and the voltage of the first voltage source may be the voltage of the normal power supply, for example, 5V.
  • the second voltage source 16 may be obtained after the first voltage source 11 is stepped down, or may be a separately provided voltage source.
  • the voltage of the second voltage source 16 may be provided by a device other than the first voltage source 11.
  • the voltage detection unit 15 is connected to the power output terminal 13 via the second switch unit 18, which can be understood as any circuit unit for detecting the voltage range of the power output terminal.
  • the voltage range can refer to a voltage range greater than a certain target voltage value, or can be a voltage range smaller than a certain target voltage value.
  • the voltage detection unit 15 can be prevented from being damaged by the power supply of the power output terminal 13 during normal power supply. That is, the second switch unit 18 can isolate the high voltage that may occur at the power output terminal 13 The voltage detection unit 15 is damaged.
  • the control unit 14 involved in this embodiment can be any circuit unit that can realize the corresponding control function. It can be a single integrated chip or a functional unit inside a certain chip. It can be built by circuit construction. To realize the corresponding functions described in this embodiment, the corresponding functions described in this embodiment can also be realized by program execution, and this embodiment does not exclude the realization of a combination of circuits and programs.
  • the control unit 14 may be a control part (such as an information processing circuit) of the power supply device integrated together, or the control unit 14 and the control part may be separate circuits.
  • FIG. 2 is a schematic diagram of the structure of a voltage detection unit, a control unit and a power output terminal in an embodiment of the present invention.
  • the voltage detection unit 15 includes a comparator 151; one input terminal of the comparator 151 is used to connect to a reference voltage, and the other input terminal is connected to the power output terminal. 13, for example, can be connected to the power output terminal 13 via the second switch unit 18. At the same time, it does not rule out the means of separately connecting other devices.
  • the voltage value of the reference voltage may be adjustable, for example, it may be controlled by the control unit 14. Furthermore, the control unit 14 is also used to adjust the voltage value of the reference voltage, wherein the reference voltage The voltage value of the voltage is determined according to the upper limit and/or the lower limit of each voltage range, and at least two different impedance ranges to the ground are determined according to different adjusted and determined reference voltages.
  • the voltage detection unit 15 may also be implemented by a voltage analog-to-digital converter ADC.
  • control unit 14 is used to:
  • the second switch unit 18 is controlled to be turned on, so that the second voltage source 11, the adjustable current source unit 17 and the power output terminal 13 are sequentially turned on. Turn on
  • the ground impedance range of the power output terminal 13 is determined.
  • the impedance range to ground can be understood as any specified impedance range under the impedance span to be detected.
  • the situation can be, for example, the low impedance where the corresponding power pin is short-circuited to the ground (for example, the power pin of the external charging cable is directly shorted or disconnected for a short time. Connected), and for example, an impedance of about several hundred to several thousand ohms appears between the corresponding power pin and the ground pin due to salt water or sweat. It can also be used for example when an electrical device (such as a mobile phone) is connected (the power output is at this time). The power channel is off state) and the insertion impedance is tens of thousands to hundreds of thousands of ohms.
  • the impedance span to the ground is relatively large, and this embodiment determines the impedance range to the ground within the span to facilitate the corresponding response based on the measured impedance range. Therefore, in this embodiment, different ground impedance ranges are associated with the causes of the ground impedance, and at least two different ground impedance ranges are determined according to different current values determined by the adjustment of the adjustable current source unit, It can also be understood that at least two different impedance ranges to ground are determined under different current values determined by the adjustment of the adjustable current source unit.
  • the impedance range of the power output terminal to ground includes at least one of the following:
  • the impedance range at no-load which matches the impedance to ground at the output of the power supply when the first switch unit is kept off; it can be understood as the premise that the power is off (that is, the first switch is off)
  • the input impedance range of the normal electric equipment is matched with the impedance to the ground when the electric equipment is normally connected to the power output terminal (the first switch is off at this time) and the ground; for example, it may be greater than 3M ohm (ie 3000K ohm);
  • the impedance range during normal power supply which matches the impedance to ground when the electrical equipment is normally connected to the output terminal of the power supply and the ground; for example, it may be 30K to 3000K ohms;
  • the impedance range during short circuit which matches the impedance to ground when the power supply pin of the power output terminal or the cable connected to it is short-circuited to ground or slightly short-circuited; it can be, for example, 0 to 300 ohms;
  • the impedance range when the external object is connected which matches the impedance to the ground when the external object is connected to the output terminal of the power supply and the ground; it can be, for example, 30K to 3000K ohm;
  • the impedance range when the salt-containing liquid is connected is matched with the impedance to the ground when the salt-containing liquid is connected between the output terminal of the power supply and the ground; it can be, for example, 300 to 3K ohms; the salt-containing liquid can be, for example, Some materials with low impedance such as salt water and sweat;
  • the impedance range during leakage which matches the impedance to ground when the power input terminal or the power supply pin of the cable connected to it leaks, and the leakage current value is greater than the threshold; it can be, for example, a certain degree of interface blockage
  • the specific value can be 3K to 30K ohms.
  • the impedance range at no load, the impedance range at normal power supply, the impedance range at leakage, the impedance range at the time of access of the salt-containing liquid, and the impedance range at the time of short circuit may be distributed in order from large to small
  • the impedance range when the foreign object is connected may be smaller than the impedance range at no-load and larger than the impedance range at leakage.
  • the impedance range to ground it can be determined according to the range of the voltage measured after a single adjustment of the current, or it can be determined according to the value range of the voltage obtained after multiple adjustments of the current.
  • the current value of the current involved and the voltage value of the reference voltage can be selected correspondingly to match the span.
  • adjusting the determined voltage value of the reference voltage includes at least two target voltage values, wherein the largest target voltage value is k times the smallest target voltage value, and k is greater than or equal to 10.
  • the current value determined by the adjustment includes at least two target current values, wherein the largest target current value is n times the smallest target current value, and n is greater than or equal to 1000. Based on the values of n and k exemplified here, while ensuring the detection of the impedance range, it is convenient to complete all the above-listed impedance ranges more efficiently.
  • target current value and the number of target voltage values can be arbitrarily changed according to demand, and the gap between the maximum value and the minimum value can also be changed arbitrarily according to demand.
  • k may not be limited to a range greater than or equal to 10.
  • N may not be limited to a range greater than or equal to 1000, and they are all changes in value or quantity, and no matter how they change, they will not deviate from the solution of this embodiment.
  • the impedance to ground is the largest when there is no load, in order to facilitate the test, it can be adjusted to the minimum current and the maximum reference voltage for testing.
  • the impedance to ground is the smallest when a short circuit or a micro short circuit occurs. In order to facilitate the test, it can be adjusted to the maximum current and minimum reference voltage for testing, and then:
  • control unit determines the impedance-to-ground impedance range of the output end of the power supply according to the different currents determined by adjustment and the detected voltage range, it is specifically used for:
  • the voltage range of the power supply output terminal is greater than the maximum The voltage range of the target voltage of, then: determine the impedance range to ground where the impedance to ground of the output terminal of the power supply is located as the impedance range at no-load;
  • the voltage range of the power supply output terminal is less than the minimum For the voltage range of the target voltage, it is determined that the ground impedance range of the output terminal of the power supply is located as the impedance range during short-circuit.
  • the second voltage source with a lower voltage can be used to supply power to the power supply terminal, and
  • the voltage detection unit is used to detect the voltage of the power supply terminal of the power supply, and further, the ground impedance of the power supply terminal of the power supply can be effectively detected based on the detection result.
  • this embodiment can detect the impedance to ground before the first voltage source supplies power to the outside, which is beneficial to prevent potential safety hazards and dangers caused by powering the outside when the impedance to ground is abnormal, and provides a basis for avoiding potential safety hazards and dangers. .
  • the command to turn on or turn off the power output can also come from the judgment of other signal lines (for example, the CC line of the USB Type C interface is pulled down by a 5.1K ohm pull-down resistor to ground (GND).
  • the standard USB Type C device load is connected) or the response to changes in environmental conditions (such as the control to turn off the first switch unit of the FET after the interface temperature is too high), or the visual judgment of the operator (such as judgment) Then press a corresponding button), it can be seen that in these technologies, no matter what method it is, it is always difficult to learn the actual situation of the impedance to ground before the main power supply channel is turned on, and the scheme involved in this embodiment can be used in the main power supply.
  • this embodiment can help prevent potential safety hazards and dangers caused by external power supply when the impedance to ground is abnormal, and provide a basis for avoiding potential safety hazards and dangers. In order to be able to judge the cause of the impedance to the ground, it is conducive to timely and accurate response.
  • control unit 14 is further configured to: when the first switch unit is kept off, control the first switch unit and the second switch unit according to the impedance range to ground The on-off.
  • At least one of the following processes can be implemented: reporting an alarm signal; reporting the value of impedance to ground or its impedance range to ground, adjusting the reference voltage, adjusting the current delivered by the second voltage source to the output of the power supply, and implementing handshake communication and many more.
  • control unit 14 controls the on-off of the first switch unit according to the impedance range to ground, it can be specifically used to implement at least one of the following:
  • the first switching unit is controlled to be turned on, the second switching unit is turned off, and the electrical equipment is connected to the ground.
  • Handshake communication
  • the first switch unit is controlled to remain off, and the The first switch unit is prohibited from being turned on.
  • control unit 14 adjusts and determines the current value of the current output by the second voltage source to the output terminal of the power supply through the adjustable current source unit, it is specifically configured to:
  • the current value of the current is adjusted to the at least two target current values in sequence from large to small, wherein the adjustment of the current value is implemented periodically, and furthermore, one or more pairs can be determined after each adjustment.
  • Fig. 3 is a second structural diagram of a processing circuit at the output end of a power supply in an embodiment of the present invention.
  • the adjustable current source unit 17 can be a current source Isrc, and the current value of the current it generates can also be characterized by Isrc.
  • the first switch unit 12 can be a FET, and the second switch unit 18 can be For analog switch Switch, the voltage detection unit 15 can use a comparator Comp.
  • VIN can be used to characterize the first voltage source 11 and its voltage
  • VDD can be used to characterize the second voltage source 16 and its voltage
  • VOUT can be used to characterize the power output and its voltage.
  • VCON to characterize the power supply pin of the cable or power-consuming device.
  • the load impedance Rload can be regarded as the impedance to ground, and its resistance can also be characterized by Rload.
  • the box on the left can be regarded as part of the circuit in the power supply equipment, and the box on the right can for example include cables and various impedance-forming objects connected to the cables.
  • This object can be, for example, circuit objects (such as electricity Equipment, metal wires of cables, etc.), non-circuit objects (for example, foreign objects, sweat, etc.), or a combination of at least one of them.
  • the number of target voltage values of the reference voltage of the comparator Comp can be two, which can be represented as Ref1 and Ref2, respectively, and the reference voltage Ref1 or Ref2 can be selected according to actual needs.
  • the reference voltage is connected to the inverting terminal of the comparator Comp
  • the output pin of the current source Isrc is connected to the power supply output terminal VOUT via the analog switch Switch
  • the output pin of the current source Isrc is also the same as the non-inverting terminal of the comparator Comp.
  • the reference voltage can also be connected to the non-inverting terminal of the comparator Comp
  • the output pin of the current source Isrc is connected to the inverting terminal of the comparator Comp.
  • the low-voltage operating voltage of the circuit used by the second voltage source VDD can be set to, for example, 3.3V, and the second voltage source VDD can be generated by the first voltage source VIN or provided by an external device (for example, other circuits in the device).
  • the EN pin of the control unit 14 as well as the SDA pin, SCL pin, and INT pin can be used for the control unit to interact with the main body of the power supply device to which it belongs.
  • the SDA pin, SCL pin, and INT pin can be used to interact with the main body of the power supply device.
  • the pin can be understood as the pin of the I2C function module in the control unit 14.
  • the EN pin, SDA pin, SCL pin, and INT pin can also use several GPIO pins (also can be understood as general-purpose input and output ports). ) Replace.
  • the current source Isrc can be configured to 1uA, 10uA, 100uA and 1mA and can periodically (for example, spend 1 millisecond every 1 second) output to detect and judge the load impedance Rload until the first
  • the main power supply channel from the voltage source VIN to the power output terminal VOUT is controlled to be turned on based on the detection result.
  • Ref 1 is 0.3V and Ref 2 is 3.0V.
  • ke regards the power output terminal VOUT and the power pin VCON of the cable as the same power pin (in fact, the power supply device After the output and the electrical equipment are connected, the power output terminal VOUT and the power supply pin VCON of the cable are basically the same) to illustrate the implementation process of the processing circuit.
  • the field effect transistor FET as the first switching unit is controlled to be in the off state, that is, the main power supply channel from the first voltage source VIN to the power output terminal VOUT is cut off.
  • the power output terminal VOUT When the power output terminal VOUT is not connected to the cable, or the power output terminal VOUT is connected to the cable, but the power pin VCON in the male connector of the cable is not connected to any electronic equipment and is in a normal no-load state, the power output terminal
  • the load impedance Rload seen at VOUT will be much greater than 3 megohms.
  • the voltage at the output terminal VOUT of the power supply is Isrc*Rload and will be greater than 3V (approximately equal to the voltage value of the second voltage source VDD, That is, Isrc*Rload ⁇ VDD), and further, the output of the comparator Comp is high at this time.
  • the load impedance Rload is between 30K and 300K ohms at this time. If the load impedance Rload is in the range of 30K to 3000K ohms, it is likely that electricity is needed at this time. The electrical equipment has been connected. The impedance of 30K to 3000K ohm is the load impedance reflected by the injection of 1uA or 10uA current source.
  • the main power supply channel from the first voltage source VIN to the power supply output terminal VOUT can be opened to provide At the same time, it can also provide the relevant information processing circuit of the power supply equipment with the range information of the load impedance Rload at this time (ie the impedance range to the ground), so that the information processing circuit of the power supply equipment can further determine the load that generates the load impedance Rload type.
  • the load impedance Rload from 3K to 30K can be judged by adjusting the current under the control of the current source Isrc to 100uA, and 300 to 3K ohms can be judged by adjusting the current under the control of the current source Isrc to 1mA.
  • the control unit can give the main part of the power supply equipment (such as its information processing circuit) an alarm and feedback the load impedance Rload through the interrupt pin INT or GPIO. Resistance range or resistance value; the impedance range to ground at this time can be understood as the impedance range during short circuit mentioned above;
  • the load impedance Rload is in the range of 300 to 3K ohms, it usually means that some materials with low impedance such as sweat and salt water, the power output terminal VOUT or the power pin of the cable, and GND form a path.
  • the Rload resistance range or resistance value that can alarm and feedback the load status; the impedance range to the ground at this time can be understood as the impedance range when the salt-containing liquid is connected in the previous article;
  • the load impedance Rload is in the range of 3K to 30K, it may be a certain degree of interface blockage and short circuit, or the interface is wet or the electronic load of general quality and relatively large leakage current is connected.
  • the first voltage source can be turned on The main power supply channel from VIN to the output terminal VOUT of the power supply.
  • the resistance range of the load impedance Rload or its resistance is fed back to the information processing circuit of the power supply device for judgment.
  • the impedance range to the ground at this time can be understood as the leakage involved in the previous article. Time impedance range;
  • the information processing circuit of the power supply device can do more operations to judge and deal with this situation.
  • This embodiment also provides an electronic device (that is, the power supply circuit involved in the foregoing), which includes the processing circuit of the power output terminal involved in the above optional solutions.
  • the electronic device can be understood as any device that can output direct current to the outside, such as a wall plug-in charger, a car charger, a mobile power supply, a travel charger, a charging pile, and so on.
  • electronic equipment that is not dedicated to power supply and charging such as computers, household appliances, industrial appliances, etc., is not excluded.
  • the use voltage is smaller.
  • the second voltage source supplies power to the power supply terminal, and the voltage detection unit is used to detect the voltage of the power supply terminal during power supply.
  • the ground impedance of the power supply terminal can be effectively detected based on the detection result. It can be seen that this embodiment can detect the impedance to ground before the first voltage source supplies power to the outside, which is beneficial to prevent potential safety hazards and dangers caused by powering externally when the impedance to ground is abnormal, and provides a basis for avoiding potential safety hazards and dangers. .
  • the present invention by adjusting the current output from the second voltage source to the power supply end of the power supply, it is convenient to accurately determine the current impedance-to-ground impedance range within a larger impedance-to-ground span. Furthermore, due to different The ground impedance range is related to the cause of the ground impedance, and the present invention can also be understood as being able to judge the cause of the ground impedance, thereby facilitating timely and accurate response.
  • Fig. 4 is a first schematic diagram of a method for detecting impedance to ground in an embodiment of the present invention
  • Fig. 5 is a schematic diagram second of a method for detecting impedance to ground in an embodiment of the present invention.
  • the method for detecting impedance to ground at the output of the power supply is applied to the control unit in the processing circuit at the output of the power supply.
  • the processing circuit can be understood as the processing circuit involved in the embodiments shown in Figures 1 to 3 .
  • the method includes:
  • step S23 it may further include:
  • Step S24 may specifically include at least one of the following:
  • the first switching unit is controlled to be turned on, the second switching unit is turned off, and the electrical equipment is connected to the ground.
  • Handshake communication
  • the first switch unit is controlled to remain off, and the The first switch unit is prohibited from being turned on.
  • the impedance range of the power supply output terminal to ground includes at least one of the following:
  • Impedance range at no-load which matches the impedance to ground at the output terminal of the power supply at no-load
  • the impedance range during normal power supply which matches the impedance to ground when the electrical equipment is normally connected to the output terminal of the power supply and the ground;
  • the impedance range during short circuit which matches the impedance to ground when the power supply pin of the output terminal of the power supply or the cable connected to it is short-circuited to the ground or slightly short-circuited;
  • the impedance range when the external object is connected which matches the impedance to the ground when the external object is connected to the output terminal of the power supply and the ground;
  • the impedance range when the salt-containing liquid is connected which matches the impedance to ground when the salt-containing liquid is connected between the output terminal of the power supply and the ground;
  • the impedance range during leakage which matches the impedance to ground when leakage occurs at the power input terminal or the power supply pin of the cable connected to it, and the leakage current value is greater than the threshold;
  • the impedance range at no-load, the impedance range at normal power supply, the impedance range at leakage, the impedance range at the time of access of the salt-containing liquid, and the impedance range at the time of short circuit are distributed in descending order;
  • the impedance range when the foreign object is connected is smaller than the impedance range when there is no load, and is larger than the impedance range when the leakage occurs.
  • the voltage detection unit includes a comparator; one input terminal of the comparator is used to connect to a reference voltage, and the other input terminal is connected to the power output terminal;
  • the method also includes:
  • the voltage value of the reference voltage is adjusted, wherein the voltage value of the reference voltage is determined according to the upper limit value and/or the lower limit value of each voltage range.
  • step S23 specifically includes:
  • the voltage range of the power supply output terminal is greater than the maximum The voltage range of the target voltage of, then: determine the impedance range to ground where the impedance to ground of the output terminal of the power supply is located as the impedance range at no-load;
  • the voltage range of the power supply output terminal is less than the minimum For the voltage range of the target voltage, it is determined that the ground impedance range of the output terminal of the power supply is located as the impedance range during short-circuit.
  • adjusting the determined voltage value of the reference voltage includes at least two target voltage values, where the largest target voltage value is k times the smallest target voltage value, where k is greater than or equal to 10.
  • the current value determined by the adjustment includes at least two target current values, where the largest target current value is n times the smallest target current value, where n is greater than or equal to 1000;
  • Step S23 specifically includes:
  • the current value of the current is adjusted to the at least two target current values sequentially from large to small, wherein the adjustment of the current value is implemented periodically.
  • the use of a lower voltage supplies power to the power supply terminal, and the voltage detection unit is used to detect the voltage of the power supply terminal during power supply. Furthermore, the ground impedance of the power supply terminal can be effectively detected based on the detection result. It can be seen that this embodiment can detect the impedance to ground before the first voltage source supplies power to the outside, which is beneficial to prevent potential safety hazards and dangers caused by powering externally when the impedance to ground is abnormal, and provides a basis for avoiding potential safety hazards and dangers. .
  • the present invention by adjusting the current output from the second voltage source to the power supply end of the power supply, it is convenient to accurately determine the current impedance-to-ground impedance range within a larger impedance-to-ground span. Furthermore, due to different The ground impedance range is related to the cause of the ground impedance, and the present invention can also be understood as being able to judge the cause of the ground impedance, thereby facilitating timely and accurate response.
  • a person of ordinary skill in the art can understand that all or part of the steps in the foregoing method embodiments can be implemented by a program instructing relevant hardware.
  • the aforementioned program can be stored in a computer readable storage medium. When the program is executed, it executes the steps including the foregoing method embodiments; and the foregoing storage medium includes: ROM, RAM, magnetic disk, or optical disk and other media that can store program codes.

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Abstract

一种电源输出端的处理电路、电子设备与对地阻抗检测方法，其中的处理电路，包括第一电压源（11）、第一开关单元（12）、控制单元（14）、第二开关单元（18）、电流调整单元（17）与电压检测单元（15）；电流调整单元（17）与第二开关单元（18）串联连接于第二电压源（16）与电源输出端（13）之间；控制单元（14）分别连接电流调整单元（17）、第一开关单元（12）、第二开关单元（18）与电压检测单元（15）；第一电压源（11）的电压大于第二电压源（16）；电压检测单元（15）经第二开关单元（18）连接电源输出端（13）。提出的技术方案能够为安全隐患与危险的避开提供依据。同时，由于不同的对地阻抗范围是与对地阻抗的产生原因相关联的，能够对对地阻抗的成因进行判断，从而有利于及时准确地进行应对。

Description

电源输出端的处理电路、电子设备与对地阻抗检测方法 技术领域
本发明涉及电源供应领域，尤其涉及一种电源输出端的处理电路、电子设备与对地阻抗检测方法。
背景技术
在电子设备中，可包括用电设备与供电设备，供电设备能够借助可插拨的线缆或固定连接的线缆连接用电设备。
现有相关技术中，供电设备对外供电之前，难以获悉对外连接的负载的大小，若负载过低(例如发生短路或微短路)，则容易导致接口高温甚至燃烧造成事故,若所接入对象存在汗水等液体，则其阻抗虽然不低，但长期保持电压输出的话，会加速线缆中电源脚与地脚的金属腐蚀，进一步的，腐蚀会导致接触阻抗变大从而产生接口处发热聚集，严重时会导致接口变形或烧毁。该负载可视作电源供电端的对地阻抗。
可见，现有的供电设备中，易于因未提前获悉电源供电端的对地阻抗而产生安全隐患与危险。
发明内容
本发明提供一种电源输出端的处理电路、电子设备与对地阻抗检测方法，以解决易产生安全隐患与危险的问题。
根据本发明的第一方面，提供了一种电源输出端的处理电路，包括设于第一电压源与所述电源输出端的第一开关单元，还包括控制单元、第二开关单元、可调电流源单元与电压检测单元；所述可调电流源单元与所述第二开关单元串联连接于第二电压源与所述电源输出端之间；所述控制单元分别连接所述可调电流源单元、所述第一开关单元、所述第二开关单元与所述电压检测单元，所述第一电压源的电压大于所述第二电压源的电压；
所述电压检测单元经所述第二开关单元连接所述电源输出端，用于检测所述电源输出端的电压所处的电压范围；
所述控制单元用于：
在所述第一开关单元保持断开时，控制所述第二开关单元导通，以使得所述第二电压源、所述可调电流源单元与所述电源输出端依次导通；
通过所述可调电流源单元调整所述第二电压源输出至所述电源输出端的电流的电流值；
根据调整所确定的不同电流值与所检测到的电压范围，确定所述电源输出端的对地阻抗所处的对地阻抗范围，其中，不同的对地阻抗范围与对地阻抗产生的原因相关联，至少两个不同对地阻抗范围是根据所述可调电流源单元调整所确定的不同电流值确定的。
可选的，所述控制单元还用于：在所述第一开关单元保持断开时，根据所述对地阻抗范围，控制所述第一开关单元与所述第二开关单元的通断。
可选的，所述控制单元根据所述对地阻抗范围，控制所述第一开关单元的通断时，具体用于实施以下至少之一：
若所述对地阻抗范围与用电设备正常接入时的对地阻抗相匹配，则控制所述第一开关单元导通，所述第二开关单元断开，并与所述用电设备实施握手通信；
若所述对地阻抗范围与所述电源输出端或其所连接的线缆的电源脚对地短路时的对地阻抗相匹配，则控制所述第一开关单元保持关断，并使得所述第一开关单元禁止被导通。
可选的，所述电源输出端的对地阻抗范围包括以下至少之一：
空载时阻抗范围，其与所述电源输出端空载时的对地阻抗相匹配；
短路时阻抗范围，其与所述电源输出端或其所连接的线缆的电源脚对地短路或微短路时的对地阻抗相匹配；
外物接入时阻抗范围，其与外物接入所述电源输出端与地时的对地阻抗相匹配；
含盐液体接入时阻抗范围，其与含盐液体接入所述电源输出端与地之间时的对地阻抗相匹配；
漏电时阻抗范围，其与所述电源输入端或其所连接的线缆的电源脚发生漏电，且漏电的电流值大于阈值时的对地阻抗相匹配；
可选的，所述电压检测单元包括比较器；所述比较器的一个输入端用于 接入参考电压，另一个输入端连接至所述电源输出端；
所述控制单元还用于调整所述参考电压的电压值，其中，所述参考电压的电压值是根据各电压范围的上限值和/或下限值确定的，至少两个不同对地阻抗范围是根据所调整确定的不同的参考电压确定的。
可选的，所述控制单元根据调整所确定的不同电流与所检测到的电压范围，确定所述电源输出端的对地阻抗所处的对地阻抗范围时，具体用于：
在所述电流的电流值被调整为最小的目标电流值，且所述参考电压的电压值被调整为最大的目标电压值时，若所述电源输出端的电压所处电压范围为大于所述最大的目标电压的电压范围，则：确定所述电源输出端的对地阻抗所处的对地阻抗范围为空载时阻抗范围；
在所述电流的电流值被调整为最大的目标电流值，且所述参考电压的电压值被调整为最小的目标电压值时，若所述电源输出端的电压所处电压范围为小于所述最小的目标电压的电压范围，则：确定所述电源输出端的对地阻抗所处的对地阻抗范围为短路时阻抗范围。
可选的，调整所确定的参考电压的电压值包括至少两个目标电压值，其中最大的目标电压值是最小的目标电压值的k倍，其中的k大于或等于10；
调整所确定的电流值包括至少两个目标电流值，其中，最大的目标电流值是最小的目标电流值的n倍，其中的n大于或等于1000。
可选的，调整所确定的电流值包括至少两个目标电流值，
所述控制单元在通过所述可调电流源单元调整确定所述第二电压源输出至所述电源输出端的电流的电流值时，具体用于：
自大到小依次将所述电流的电流值调整为所述至少两个目标电流值，其中，对电流值的调整是定期实施的。
根据本发明的第二方面，提供了一种电源输出端的对地阻抗检测方法，应用于电源输出端的处理电路中的控制单元，所述处理电路包括设于第一电压源与所述电源输出端的第一开关单元，以及第二开关单元与第二电压源，所述第一电压源的电压大于所述第二电压源的电压；所述的方法，包括：
在所述第一开关单元保持断开时，控制所述第二开关单元导通，以使得所述第二电压源与所述电源输出端间能够导通；
调整所述第二电压源输出至所述电源输出端的电流的电流值；
根据调整所确定的不同电流值与所检测到的电压范围，确定所述电源输出端的对地阻抗所处的对地阻抗范围，其中，不同的对地阻抗范围与对地阻抗产生的原因相关联，至少两个不同对地阻抗范围是根据调整所确定的不同电流值确定的。
根据本发明的第三方面，提供了一种电子设备，包括第一方面及其可选方案涉及的电源输出端的处理电路。
本发明提供的电源输出端的处理电路、电子设备与对地阻抗检测方法中，能够在控制第一开关单元断开时(即电源供电端未以所需的较高电压对外供电时)，利用电压较小的第二电压源对电源供电端进行供电，并在供电时利用电压检测单元对电源供电端的电压进行检测，进而，可基于检测结果对电源供电端的对地阻抗进行有效检测。可见，本发明可在第一电压源对外供电之前检测到对地阻抗，从而有利于防止对地阻抗异常时依旧对外供电而造成的安全隐患与危险，为安全隐患与危险的避开提供依据。
同时，本发明通过调整第二电压源输出至电源供电端的电流，可便于在一个较大的对地阻抗跨度内，准确确定当前对地阻抗所处的对地阻抗范围，进而，由于不同的对地阻抗范围是与对地阻抗的产生原因相关联的，本发明也可理解为能够对对地阻抗的成因进行判断，从而有利于及时准确地进行应对。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1是本发明一实施例中电源输出端的处理电路的构造示意图一；
图2是本发明一实施例中电压检测单元、控制单元与电源输出端的构造示意图；
图3是本发明一实施例中电源输出端的处理电路的构造示意图二。
附图标记说明：
11-第一电压源；
12-第一开关单元；
13-电源输出端；
14-控制单元；
15-电压检测单元；
151-比较器；
16-第二电压源；
17-可调电流源单元；
18-第二开关单元；
100-供电设备；
200-接入电路；
Isrc-电流源；
VIN-第一电压源；
VDD-第二电压源；
VOUT-电源输出端；
VCON-电源脚；
Switch-模拟开关；
FET-场效应管；
Comp-比较器；
Rload-负载阻抗；
图4是本发明一实施例中对地阻抗检测方法的流程示意图一；
图5是本发明一实施例中对地阻抗检测方法的流程示意图二。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互 换，以便这里描述的本发明的实施例能够以除了在这里图示或描述的那些以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
下面以具体地实施例对本发明的技术方案进行详细说明。下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例不再赘述。
图1是本发明一实施例中电源输出端的处理电路的构造示意图一。
本实施例所涉及的处理电路，可以为一颗集成的芯片或一颗集成芯片内部的一个功能模块，任意能满足以下描述的电路，均不脱离本实施例的描述。该处理电路可理解为是供电设备中的电路。同时，本实施例也不排除其分布于不同设备中的情形。
请参考图1，电源输出端的处理电路，包括设于第一电压源11与所述电源输出端13的第一开关单元12。其可理解为现有相关技术中针对于电源供电端的电路形式，在具体实施过程中，其中还可串联和/或并联其他器件，只要满足以上描述，不论是否配置了其他器件，均不脱离本实施例的描述。
其中的电源输出端13，可理解为：若处理电路应用于供电设备，则该电源供电端13可以是固定或可分离地连接线缆或用电设备的一端(例如也可理解为是供电设备的电源脚)，该电源输出端13的构造可根据供电方式的不同而变化，例如可以是USB Type C接口。
其中的第一开关单元12，可以为任意能够实现导通与关断的器件，例如可以是场效应管，其也可表征为FET，其为Field Effect Transistor的缩写。
其中的第一电压源，可理解为能够为用电设备的供电提供直流电的任意器件或器件的集合，例如可以是供电设备中AC-DC或DC-DC电源器件或器件的组合。
本实施例中，电源输出端的处理电路还可包括控制单元14、第二开关单元18、可调电流源单元17与电压检测单元15。
所述可调电流源单元17与所述第二开关单元18串联连接于第二电压源 16与所述电源输出端13之间；进而，在第一开关单元18导通时，第二电压源16的供电可被输送至电源输出端13，其中的可调电流源单元17可对输送时的电流进行调整。通过以上第二电压源16、可调电流源单元17与第二开关单元18，可产生便于对地阻抗检测电路基础。
其中的可调电流源单元17，可以是任意基于所供应的电压能够对其产生的电流进行调整的器件或器件的集合，一种举例中，可调电流源单元17可以包括串联于第二电压源与电源输出端之间的电流源；另一种举例中，可调电流源单元17也可采用可控通断的上拉电阻来实现，例如可以包括电阻组件，该电阻组件可例如包括多个并联的电阻支路，其中，不同电阻支路的可以产生相同阻抗，也可产生不同阻抗，通过对导通的电阻支路进行选择(包括同时导通多个支路的情形，也包括单独导通单个支路的情形)，也可实现对电流的调整，其他举例中，也可将电阻替换为其他器件，此外，本实施例也不排除其他可实现电流调整的电路单元。
其中的第二开关单元18，可以为任意能够实现导通与关断的器件，例如可以是模拟开关，其在第一开关单元12导通进行供电可关断，进而，可避免正常供电时电源输出端13的供电对可调电流源单元17造成损伤，即：第二开关单元18可隔离电源输出端13可能出现的高压对可调电流源单元17的损伤。可见，具体实施过程中，第二开关单元18，可以为能够隔离高压的模拟开关。
所述控制单元14分别连接所述可调电流源单元17与所述电压检测单元15，以及第一开关单元12与第二开关单元18，所述第一电压源11的电压大于所述第二电压源16的电压；其中第二电压源的电压可以为电路的低压工作电压，例如可以是3.3V，其中的第一电压源的电压可以为正常供电的电压，例如可以是5V。该第二电压源16可以是第一电压源11降压后得到的，也可以是单独提供的电压源，例如，其电压可以是第一电压源11之外的其他器件提供的。
所述电压检测单元15经所述第二开关单元18连接所述电源输出端13，其可理解为用于检测所述电源输出端的电压所处的电压范围的任意电路单元。该电压范围可以是指大于某一目标电压值的电压范围，也可以是小于某一目标电压值的电压范围。
其中，通过第二开关单元18的断开，也可避免正常供电时电源输出端13的供电对电压检测单元15造成损伤，即：第二开关单元18可隔离电源输出端13可能出现的高压对电压检测单元15的损伤。
本实施例所涉及的控制单元14，可以是任意可实现相应控制功能的电路单元，其可以是单独一颗集成的芯片，也可以是某芯片内部的一个功能单元，其可以利用电路的搭建来实现本实施例所描述的相应功能，也可通过程序执行的方式来实现本实施例所描述的相应功能，本实施例也不排除电路与程序相结合的方式来实现。同时，控制单元14可以是供电设备的控制部分(例如信息处理电路)整合在一起，也可控制单元14与该控制部分也可以是分立的不同电路。
图2是本发明一实施例中电压检测单元、控制单元与电源输出端的构造示意图。
其中一种实施方式中，请参考图2，所述电压检测单元15包括比较器151；所述比较器151的一个输入端用于接入参考电压，另一个输入端连接至所述电源输出端13，例如可经第二开关单元18连接至电源输出端13。同时，也不排除另行接入其他器件的手段。
具体实施过程中，参考电压的电压值可以是可调的，例如可以是经由控制单元14控制的，进而，所述控制单元14还用于调整所述参考电压的电压值，其中，所述参考电压的电压值是根据各电压范围的上限值和/或下限值确定的，至少两个不同对地阻抗范围是根据所调整确定的不同的参考电压确定的。
其他实施方式中，电压检测单元15也可采用电压的模数转换器ADC来实现。
本实施例中，所述控制单元14用于：
在所述第一开关单元12保持断开时，控制所述第二开关单元18导通，以使得所述第二电压源11、所述可调电流源单元17与所述电源输出端13依次导通；
通过所述可调电流源单元17调整所述第二电压源16输出至所述电源输出端13的电流的电流值；
根据调整所确定的不同电流值与所检测到的电压范围，确定所述电源输 出端13的对地阻抗所处的对地阻抗范围。
其中的对地阻抗范围，可理解为所需检测的阻抗跨度下任意所指定的阻抗范围。
在对地阻抗中，其形成的情形可例如相应电源脚对地短路了的低阻抗(例如外接充电线缆的线头电源脚和地脚之间被直接短接了或时短时断的接近短接了)，又例如因为盐水或汗液等导致相应电源脚和地脚之间出现大约几百到几千欧姆的阻抗，还可例如用电设备(例如手机)接入时(此时电源输出处于电源通道关断状态)而体现的几万到几十万欧姆不等的插入阻抗。可见，对地阻抗跨度较大，本实施例通过对跨度内对地阻抗范围的确定，便于基于所测定的阻抗范围实施相应的应对。故而，本实施例中，不同的对地阻抗范围与对地阻抗产生的原因相关联，至少两个不同对地阻抗范围是根据所述可调电流源单元调整所确定的不同电流值确定的，其也可理解为：至少两个不同对地阻抗范围是在所述可调电流源单元调整所确定的不同电流值下确定的。
其中一种实施方式中，所述电源输出端的对地阻抗范围包括以下至少之一：
空载时阻抗范围，其与所述第一开关单元保持断开时所述电源输出端空载时的对地阻抗相匹配；其可理解为在电源断开的前提下(即第一开关断开时)，正常用电设备表现的输入阻抗范围，其与用电设备正常接入所述电源输出端(此时第一开关断开)与地时的对地阻抗相匹配；例如可以是大于3M欧姆(即3000K欧姆)；
正常供电时阻抗范围，其与用电设备正常接入所述电源输出端与地时的对地阻抗相匹配；例如可以是30K至3000K欧姆；
短路时阻抗范围，其与所述电源输出端或其所连接的线缆的电源脚对地短路或微短路时的对地阻抗相匹配；其可例如是0至300欧姆；
外物接入时阻抗范围，其与外物接入所述电源输出端与地时的对地阻抗相匹配；其可例如在30K至3000K欧姆；
含盐液体接入时阻抗范围，其与含盐液体接入所述电源输出端与地之间时的对地阻抗相匹配；其可例如是300至3K欧姆；其中的含盐液体可例如是盐水、汗液等某些阻抗较低的材料；
漏电时阻抗范围，其与所述电源输入端或其所连接的线缆的电源脚发生 漏电，且漏电的电流值大于阈值时的对地阻抗相匹配；其可例如是某种程度的接口堵塞短路或接口潮湿或品质一般而产生漏电，且且漏电流比较大的电子负载接入的情形，具体可以为3K至30K欧姆。
其中，所述空载时阻抗范围、所述正常供电时阻抗范围、所述漏电时阻抗范围、所述含盐液体接入时阻抗范围与所述短路时阻抗范围可以是由大到小依次分布；所述外物接入时阻抗范围可以小于所述空载时阻抗范围，且大于所述漏电时阻抗范围。
在确定对地阻抗范围时，可以根据单次调整电流后测得的电压的区间范围来确定，也可根据多次调整电流后每次得到的电压的取值范围来确定。
由于对地阻抗的跨度较大，例如需跨越0至3M欧姆的范围，以上所涉及的电流的电流值与参考电压的电压值可对应选择相匹配的跨度。
其中一种实施方式中，调整所确定的参考电压的电压值包括至少两个目标电压值，其中最大的目标电压值是最小的目标电压值的k倍，其中的k大于或等于10。调整所确定的电流值包括至少两个目标电流值，其中，最大的目标电流值是最小的目标电流值的n倍，其中的n大于或等于1000。基于此处所举例的n与k的取值，可在保障阻抗范围检测的同时，便于更高效地完成所有以上所列举的对地阻抗范围。
此外，目标电流值、目标电压值的数量均可根据需求任意变化，其最大值与最小值之间的差距也可根据需求任意变化，例如，其中的k可不限于大于或等于10的范围，其中的n也可不限于大于或等于1000的范围，其均是在数值或数量上的变化，不论如何变化，均不会脱离本实施例方案。
基于所配置的目标电流值与目标电压值，由于空载时对地阻抗最大，为了便于测试，可调整至最小的电流与最大的参考电压来进行测试，短路或微短路时对地阻抗最小，为了便于测试，可调整至最大的电流与最小的参考电压进行测试，进而：
所述控制单元根据调整所确定的不同电流与所检测到的电压范围，确定所述电源输出端的对地阻抗所处的对地阻抗范围时，具体用于：
在所述电流的电流值被调整为最小的目标电流值，且所述参考电压的电压值被调整为最大的目标电压值时，若所述电源输出端的电压所处电压范围为大于所述最大的目标电压的电压范围，则：确定所述电源输出端的对地阻 抗所处的对地阻抗范围为空载时阻抗范围；
在所述电流的电流值被调整为最大的目标电流值，且所述参考电压的电压值被调整为最小的目标电压值时，若所述电源输出端的电压所处电压范围为小于所述最小的目标电压的电压范围，则：确定所述电源输出端的对地阻抗所处的对地阻抗范围为短路时阻抗范围。
以上方案中，能够在控制第一开关单元断开时(即电源供电端未以所需的较高电压对外供电时)，利用电压较小的第二电压源对电源供电端进行供电，并在供电时利用电压检测单元对电源供电端的电压进行检测，进而，可基于检测结果对电源供电端的对地阻抗进行有效检测。进而，本实施例可在第一电压源对外供电之前检测到对地阻抗，从而有利于防止对地阻抗异常时依旧对外供电而造成的安全隐患与危险，为安全隐患与危险的避开提供依据。
同时，本实施例通过调整第二电压源输出至电源供电端的电流，可便于在一个较大的对地阻抗跨度内，准确确定当前对地阻抗所处的对地阻抗范围，进而，由于不同的对地阻抗范围是与对地阻抗的产生原因相关联的，本实施例也可理解为能够对对地阻抗的成因进行判断，从而有利于及时准确地进行应对。
还需指出，在部分技术中，打开或关断电源输出端的命令也可来自对其他信号线的判断(如USB Type C接口的CC线被5.1K欧姆的对地(GND)下拉电阻拉低表示标准的USB Type C设备负载被接入了)或对环境状态变化的应对(如接口温度过高后控制断开例如FET的第一开关单元)，亦或来自操作人员的目视判断(如判断后按下某个对应按钮)，可见，在这些技术中，不论是何种方式，在打开主电源通道之前始终难以获悉对地阻抗的实际情况，而本实施例所涉及的方案可在主电源通道关闭的情形下进行判断。如前文所提及的，相较于该些现有技术，本实施例可有利于防止对地阻抗异常时依旧对外供电而造成的安全隐患与危险，为安全隐患与危险的避开提供依据，为能够对对地阻抗的成因进行判断，从而有利于及时准确地进行应对。
其中一种实施方式中，所述控制单元14还用于：在所述第一开关单元保持断开时，根据所述对地阻抗范围，控制所述第一开关单元与所述第二开关单元的通断。
除了控制通断，还可实施以下至少之一处理：上报警报信号；上报对地 阻抗的数值或其对地阻抗范围、调整参考电压、调整第二电压源输送至电源输出端的电流、实施握手通信等等。
具体实施过程中，所述控制单元14根据所述对地阻抗范围，控制所述第一开关单元的通断时，具体可用于实施以下至少之一：
若所述对地阻抗范围与用电设备正常接入时的对地阻抗相匹配，则控制所述第一开关单元导通，所述第二开关单元断开，并与所述用电设备实施握手通信；
若所述对地阻抗范围与所述电源输出端或其所连接的线缆的电源脚对地短路时的对地阻抗相匹配，则控制所述第一开关单元保持关断，并使得所述第一开关单元禁止被导通。
所述控制单元14在通过所述可调电流源单元调整确定所述第二电压源输出至所述电源输出端的电流的电流值时，具体用于：
自大到小依次将所述电流的电流值调整为所述至少两个目标电流值，其中，对电流值的调整是定期实施的，进而，在每次调整后可确定对应一个或多个对地阻抗范围的上限值或下限值。在其他可选实施方式中，也不排除自小到达依次调整的手段。
图3是本发明一实施例中电源输出端的处理电路的构造示意图二。
在图3中，可调电流源单元17可采用电流源Isrc，其产生的电流的电流值，也可利用Isrc表征，第一开关单元12可采用场效应管FET，第二开关单元18可采用模拟开关Switch，电压检测单元15可采用比较器Comp，同时，还可利用VIN表征第一电压源11及其电压，利用VDD表征第二电压源16及其电压，利用VOUT表征电源输出端及其电压，利用VCON表征线缆或用电侧设备的电源脚，同时，其中的负载阻抗Rload可以视作对地阻抗，其阻值也可利用Rload表征。其中左侧方框可视作供电设备中的部分电路，右侧方框可例如包括线缆，以及连接至线缆的各种可形成阻抗的对象，该对象可例如是电路对象(例如用电设备、线缆的金属线等等)、非电路对象(例如外物、汗液等等)或其至少之一的组合。
以下以图3所示为例对本实施例的具体实现方式进行举例。
其中，比较器Comp的参考电压的目标电压值的数量可以为两个，分别可表征为Ref1与Ref2，参考电压Ref1或Ref2可以按实际需要选不同 的电压值。
在图3所示举例中，参考电压连接在比较器Comp的反相端，电流源Isrc的输出脚经过模拟开关Switch接到电源输出端VOUT，电流源Isrc输出脚也与比较器Comp的同相端相连，在其他举例中，参考电压也可连比较器Comp的同相端，而电流源Isrc的输出脚连接比较器Comp的反相端。第二电压源VDD所用的电路的低压工作电压可例如设为3.3V，该第二电压源VDD可以由第一电压源VIN产生也可以由外部(例如设备中的其他电路)提供。
图3所示的举例中，控制单元14的EN脚以及SDA脚、SCL脚、INT脚这几个脚可用于控制单元与所属的供电设备的主体部分进行交互，其中SDA脚、SCL脚、INT脚可理解为控制单元14中I2C功能模块的引脚，其他举例中，EN脚以及SDA脚、SCL脚、INT脚这几个脚也可以用几个GPIO脚(也可理解为通用输入输出口)替代。
为了便于对其运作过程进行描述，可假设电流源Isrc能够配置成1uA，10uA，100uA和1mA并可以定期(比如每1秒中花1毫秒)输出对负载阻抗Rload进行检测、判断，直至第一电压源VIN到电源输出端VOUT的主电源通道基于检测结果被控制导通为止。
进一步的，可假设其中的Ref 1为0.3V，Ref 2为3.0V，同时，ke将电源输出端VOUT和线缆的电源脚VCON视作同一个电源脚(事实上通过标准线缆把供电设备输出和用电设备连起来后，电源输出端VOUT和线缆的电源脚VCON基本是相等的)来阐述所述处理电路的实现过程。
供电设备在等待电子设备接入的过程中，作为第一开关单元的场效应管FET被控制处于断开状态，即：第一电压源VIN到电源输出端VOUT的主电源通道被切断，此时，作为第二开关单元的模拟开关Switch处于导通状态，电流源Isrc控制下的电流可被配置成1uA的目标电流值，参考电压接到比较器反相端并配置成Ref 2＝3.0V；
当电源输出端VOUT没有连接线缆，或电源输出端VOUT连接了线缆，但线缆的公头中的电源脚VCON没有接任何电子设备且处于正常空载状态时，此时自电源输出端VOUT处看到的负载阻抗Rload就会远大于3兆欧姆，经过1uA电流源后即电源输出端VOUT处的电压即为Isrc*Rload 就会大于3V(近似等于第二电压源VDD的电压值，即Isrc*Rload≈VDD)，进而，此时比较器Comp的输出为高电平。
当控制单元14此时检测到比较器Comp的输出为低电平时，则可将参考电压由Ref2调整为Ref1＝0.3V，如果此时比较器Comp的输出重新变高，则知道负载阻抗Rload的阻抗在300K到3000K欧姆之间，反之，如果此时比较器输出继续为低，则可将电流源Isrc的电流值调成10uA的目标电流值，同时，参考电压继续保持为Ref 1＝0.3V。
如果此时比较器Comp的输出为高电平，则知道此时负载阻抗Rload在30K到300K欧姆之间，如果负载阻抗Rload在30K到3000K欧姆这个范围，此时极大可能是需要用电的用电设备已接入，30K到3000K欧姆的阻抗是它们在1uA或10uA电流源注入下体现出来的负载阻抗，此时可以打开第一电压源VIN到电源输出端VOUT的主电源通道，以给用电设备供电，同时，还可给供电设备的相关信息处理电路提供此时负载阻抗Rload的范围信息(即对地阻抗范围)，以便供电设备的信息处理电路可以进一步判断产生负载阻抗Rload的负载的类型。
不过，此时即使负载阻抗Rload不是真正的用电负载，而是某种阻抗在30K到3000K欧姆的杂物搭接了电源输出端Vout和GND或线缆的电源脚VCON和GND，也不会因为打开第一电压源VIN到电源输出端VOUT的电源通道而造成损伤(只是会导致系统有较小的一两个微安到一两百个微安的漏电流)，正确判断后，及时处理即可。
基于与以上过程相类似的原理，通过将电流源Isrc控制下的电流调整为100uA可以判断到3K到30K的负载阻抗Rload,通过将电流源Isrc控制下的电流调整为1mA可以判断300到3K欧姆的负载阻抗Rload,以及小于300欧姆的负载阻抗Rload(此时，参考电压为Ref 1＝0.3V，且比较器Comp输出为低电平)。
根据电流源和比较器配合得出的负载阻抗Rload范围后，即可做相应操作。
比如：若负载阻抗Rload小于300欧姆时，此时通常表示电源输出端VOUT和GND或线缆的电源脚VCON和GND之间被短路或微短路，此时不能打开第一电压源VIN到电源输出端VOUT的主电源通道，否则可 能导致高温或起火事件发生，具体实施过程中，控制单元能够通过中断脚INT或GPIO给供电设备的主体部分(例如其信息处理电路)报警并反馈负载阻抗Rload的阻值范围或阻值；此时的对地阻抗范围可理解为前文所涉及的短路时阻抗范围；
再比如：若负载阻抗Rload在300到3K欧姆的范围时，通常表示汗液、盐水等某些阻抗较低的材料、电源输出端VOUT或线缆的电源脚，以及GND形成了通路，此时也可报警并反馈负载状况的Rload阻值范围或阻值；此时的对地阻抗范围可理解为前文所涉及的含盐液体接入时阻抗范围；
又比如：若负载阻抗Rload在3K到30K的范围，则有可能是某种程度的接口堵塞短路或接口潮湿或品质一般且漏电流比较大的电子负载接入,此时可以打开第一电压源VIN到电源输出端VOUT的主电源通道，同时将负载阻抗Rload的阻值范围或其阻值反馈给供电设备的信息处理电路进行判断，此时的对地阻抗范围可理解为前文所涉及的漏电时阻抗范围；
还比如，如果负载阻抗Rload接入的时候就是一个有一定电压和输出能力的电压源，则供电设备的信息处理电路可做更多的操作来判断和处理此种情况。
总之，如果要扩大接入负载阻抗Rload的跨度，还可以进一步配置电流源的目标电流值以及参考电压的目标电压值来实现。
本实施例还提供了一种电子设备(即前文所涉及的供电电路)，包括以上可选方案涉及的电源输出端的处理电路。
其中的电子设备，可理解为能够对外输出直流电的任意设备，例如可以是墙插式充电器、车载充电器、移动电源、旅行充电器、充电桩等等。同时，也不排除非专用于供电、充电的电子设备，例如计算机、家用电器、工业电器等等。
综上，本实施例提供的电源输出端的处理电路、电子设备中，能够在控制第一开关单元断开时(即电源供电端未以所需的较高电压对外供电时)，利用电压较小的第二电压源对电源供电端进行供电，并在供电时利用电压检测单元对电源供电端的电压进行检测，进而，可基于检测结果对电源供电端的对地阻抗进行有效检测。可见，本实施例可在第一电压源对外供电之前检测 到对地阻抗，从而有利于防止对地阻抗异常时依旧对外供电而造成的安全隐患与危险，为安全隐患与危险的避开提供依据。
同时，本实施例通过调整第二电压源输出至电源供电端的电流，可便于在一个较大的对地阻抗跨度内，准确确定当前对地阻抗所处的对地阻抗范围，进而，由于不同的对地阻抗范围是与对地阻抗的产生原因相关联的，本发明也可理解为能够对对地阻抗的成因进行判断，从而有利于及时准确地进行应对。
图4是本发明一实施例中对地阻抗检测方法的流程示意图一；图5是本发明一实施例中对地阻抗检测方法的流程示意图二。
请参考图4和图5，电源输出端的对地阻抗检测方法，应用于电源输出端的处理电路中的控制单元，所述处理电路可理解为图1至图3所示实施方式所涉及的处理电路。所述的方法，包括：
S21：在所述第一开关单元保持断开时，控制所述第二开关单元导通，以使得所述第二电压源与所述电源输出端间能够导通；
S22：调整所述第二电压源输出至所述电源输出端的电流的电流值；
S23：根据调整所确定的不同电流值与所检测到的电压范围，确定所述电源输出端的对地阻抗所处的对地阻抗范围，其中，不同的对地阻抗范围与对地阻抗产生的原因相关联。
可选的，步骤S23之后，还可包括：
S24：在所述第一开关单元保持断开时，根据所述对地阻抗范围，控制所述第一开关单元与所述第二开关单元的通断。
步骤S24具体可以包括以下至少之一：
若所述对地阻抗范围与用电设备正常接入时的对地阻抗相匹配，则控制所述第一开关单元导通，所述第二开关单元断开，并与所述用电设备实施握手通信；
若所述对地阻抗范围与所述电源输出端或其所连接的线缆的电源脚对地短路时的对地阻抗相匹配，则控制所述第一开关单元保持关断，并使得所述第一开关单元禁止被导通。
可选的，所述电源输出端的对地阻抗范围包括以下至少之一：
空载时阻抗范围，其与所述电源输出端空载时的对地阻抗相匹配；
正常供电时阻抗范围，其与用电设备正常接入所述电源输出端与地时的对地阻抗相匹配；
短路时阻抗范围，其与所述电源输出端或其所连接的线缆的电源脚对地短路或微短路时的对地阻抗相匹配；
外物接入时阻抗范围，其与外物接入所述电源输出端与地时的对地阻抗相匹配；
含盐液体接入时阻抗范围，其与含盐液体接入所述电源输出端与地之间时的对地阻抗相匹配；
漏电时阻抗范围，其与所述电源输入端或其所连接的线缆的电源脚发生漏电，且漏电的电流值大于阈值时的对地阻抗相匹配；
其中，所述空载时阻抗范围、所述正常供电时阻抗范围、所述漏电时阻抗范围、所述含盐液体接入时阻抗范围与所述短路时阻抗范围由大到小依次分布；
所述外物接入时阻抗范围小于所述空载时阻抗范围，且大于所述漏电时阻抗范围。
可选的，所述电压检测单元包括比较器；所述比较器的一个输入端用于接入参考电压，另一个输入端连接至所述电源输出端；
所述的方法，还包括：
调整所述参考电压的电压值，其中，所述参考电压的电压值是根据各电压范围的上限值和/或下限值确定的。
可选的，步骤S23具体包括：
在所述电流的电流值被调整为最小的目标电流值，且所述参考电压的电压值被调整为最大的目标电压值时，若所述电源输出端的电压所处电压范围为大于所述最大的目标电压的电压范围，则：确定所述电源输出端的对地阻抗所处的对地阻抗范围为空载时阻抗范围；
在所述电流的电流值被调整为最大的目标电流值，且所述参考电压的电压值被调整为最小的目标电压值时，若所述电源输出端的电压所处电压范围为小于所述最小的目标电压的电压范围，则：确定所述电源输出端的对地阻抗所处的对地阻抗范围为短路时阻抗范围。
可选的，调整所确定的参考电压的电压值包括至少两个目标电压值，其 中最大的目标电压值是最小的目标电压值的k倍，其中的k大于或等于10。
可选的，调整所确定的电流值包括至少两个目标电流值，其中，最大的目标电流值是最小的目标电流值的n倍，其中的n大于或等于1000；
步骤S23具体包括：
自大到小依次将所述电流的电流值调整为所述至少两个目标电流值，其中，对电流值的调整是定期实施的。
综上，本实施例提供的电源输出端的对地阻抗检测方法中，能够在控制第一开关单元断开时(即电源供电端未以所需的较高电压对外供电时)，利用电压较小的第二电压源对电源供电端进行供电，并在供电时利用电压检测单元对电源供电端的电压进行检测，进而，可基于检测结果对电源供电端的对地阻抗进行有效检测。可见，本实施例可在第一电压源对外供电之前检测到对地阻抗，从而有利于防止对地阻抗异常时依旧对外供电而造成的安全隐患与危险，为安全隐患与危险的避开提供依据。
同时，本实施例通过调整第二电压源输出至电源供电端的电流，可便于在一个较大的对地阻抗跨度内，准确确定当前对地阻抗所处的对地阻抗范围，进而，由于不同的对地阻抗范围是与对地阻抗的产生原因相关联的，本发明也可理解为能够对对地阻抗的成因进行判断，从而有利于及时准确地进行应对。
本领域普通技术人员可以理解：实现上述各方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成。前述的程序可以存储于一计算机可读取存储介质中。该程序在执行时，执行包括上述各方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (10)

  1. 一种电源输出端的处理电路，包括设于第一电压源与所述电源输出端的第一开关单元，其特征在于，还包括控制单元、第二开关单元、可调电流源单元与电压检测单元；所述可调电流源单元与所述第二开关单元串联连接于第二电压源与所述电源输出端之间；所述控制单元分别连接所述可调电流源单元、所述第一开关单元、所述第二开关单元与所述电压检测单元；所述第一电压源的电压大于所述第二电压源的电压；
    所述电压检测单元经所述第二开关单元连接所述电源输出端，用于检测所述电源输出端的电压所处的电压范围；
    所述控制单元用于：
    在所述第一开关单元保持断开时，控制所述第二开关单元导通，以使得所述第二电压源、所述可调电流源单元与所述电源输出端依次导通；
    通过所述可调电流源单元调整所述第二电压源输出至所述电源输出端的电流的电流值；
    根据调整所确定的不同电流值与所检测到的电压范围，确定所述电源输出端的对地阻抗所处的对地阻抗范围，其中，不同的对地阻抗范围与对地阻抗产生的原因相关联，至少两个不同对地阻抗范围是根据所述可调电流源单元调整所确定的不同电流值确定的。
  2. 根据权利要求1所述的处理电路，其特征在于，所述控制单元还用于：在所述第一开关单元保持断开时，根据所述对地阻抗范围，控制所述第一开关单元与所述第二开关单元的通断。
  3. 根据权利要求2所述的处理电路，其特征在于，所述控制单元根据所述对地阻抗范围，控制所述第一开关单元的通断时，具体用于实施以下至少之一：
    若所述对地阻抗范围与用电设备正常接入时的对地阻抗相匹配，则控制所述第一开关单元导通，所述第二开关单元断开，并与所述用电设备实施握手通信；
    若所述对地阻抗范围与所述电源输出端或其所连接的线缆的电源脚对地短路时的对地阻抗相匹配，则控制所述第一开关单元保持关断，并使得所述第一开关单元禁止被导通。
  4. 根据权利要求1所述的处理电路，其特征在于，所述电源输出端的对地阻抗范围包括以下至少之一：
    空载时阻抗范围，其与所述第一开关单元保持断开时所述电源输出端空载时的对地阻抗相匹配；
    短路时阻抗范围，其与所述电源输出端或其所连接的线缆的电源脚对地短路或微短路时的对地阻抗相匹配；
    外物接入时阻抗范围，其与外物接入所述电源输出端与地时的对地阻抗相匹配；
    含盐液体接入时阻抗范围，其与含盐液体接入所述电源输出端与地之间时的对地阻抗相匹配；
    漏电时阻抗范围，其与所述电源输入端或其所连接的线缆的电源脚发生漏电，且漏电的电流值大于阈值时的对地阻抗相匹配。
  5. 根据权利要求1至4任一项所述的处理电路，其特征在于，所述电压检测单元包括比较器；所述比较器的一个输入端用于接入参考电压，另一个输入端连接至所述电源输出端；
    所述控制单元还用于调整所述参考电压的电压值，其中，所述参考电压的电压值是根据各电压范围的上限值和/或下限值确定的，至少两个不同对地阻抗范围是根据所调整确定的不同的参考电压确定的。
  6. 根据权利要求5所述的处理电路，其特征在于，所述控制单元根据调整所确定的不同电流与所检测到的电压范围，确定所述电源输出端的对地阻抗所处的对地阻抗范围时，具体用于：
    在所述电流的电流值被调整为最小的目标电流值，且所述参考电压的电压值被调整为最大的目标电压值时，若所述电源输出端的电压所处电压范围为大于所述最大的目标电压的电压范围，则：确定所述电源输出端的对地阻抗所处的对地阻抗范围为空载时阻抗范围；
    在所述电流的电流值被调整为最大的目标电流值，且所述参考电压的电压值被调整为最小的目标电压值时，若所述电源输出端的电压所处电压范围为小于所述最小的目标电压的电压范围，则：确定所述电源输出端的对地阻抗所处的对地阻抗范围为短路时阻抗范围。
  7. 根据权利要求5所述的处理电路，其特征在于，调整所确定的参考电 压的电压值包括至少两个目标电压值，其中最大的目标电压值是最小的目标电压值的k倍，其中的k大于或等于10；
    调整所确定的电流值包括至少两个目标电流值，其中，最大的目标电流值是最小的目标电流值的n倍，其中的n大于或等于1000。
  8. 根据权利要求1至4任一项所述的处理电路，其特征在于，调整所确定的电流值包括至少两个目标电流值；
    所述控制单元在通过所述可调电流源单元调整确定所述第二电压源输出至所述电源输出端的电流的电流值时，具体用于：
    自大到小依次将所述电流的电流值调整为所述至少两个目标电流值，其中，对电流值的调整是定期实施的。
  9. 一种电源输出端的对地阻抗检测方法，应用于电源输出端的处理电路中的控制单元，其特征在于，所述处理电路包括设于第一电压源与所述电源输出端的第一开关单元，以及第二开关单元与第二电压源，所述第一电压源的电压大于所述第二电压源的电压；所述的方法，包括：
    在所述第一开关单元保持断开时，控制所述第二开关单元导通，以使得所述第二电压源与所述电源输出端间能够导通；
    调整所述第二电压源输出至所述电源输出端的电流的电流值；
    根据调整所确定的不同电流值与所检测到的电压范围，确定所述电源输出端的对地阻抗所处的对地阻抗范围，其中，不同的对地阻抗范围与对地阻抗产生的原因相关联，至少两个不同对地阻抗范围是根据调整所确定的不同电流值确定的。
  10. 一种电子设备，包括权利要求1至8任一项所述的电源输出端的处理电路。
PCT/CN2020/129079 2019-12-16 2020-11-16 电源输出端的处理电路、电子设备与对地阻抗检测方法 WO2021120947A1 (zh)

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