CN106405200A - Peak current detection method, device and switching power source - Google Patents

Peak current detection method, device and switching power source Download PDF

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Publication number
CN106405200A
CN106405200A CN201610796061.2A CN201610796061A CN106405200A CN 106405200 A CN106405200 A CN 106405200A CN 201610796061 A CN201610796061 A CN 201610796061A CN 106405200 A CN106405200 A CN 106405200A
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CN
China
Prior art keywords
voltage
conductor area
temperature
value
current
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Pending
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CN201610796061.2A
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Chinese (zh)
Inventor
冯骏
游旭根
孔君
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SICHUAN SHENGHUA POWER SUPPLY TECHNOLOGY Co Ltd
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SICHUAN SHENGHUA POWER SUPPLY TECHNOLOGY Co Ltd
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Priority to CN201610796061.2A priority Critical patent/CN106405200A/en
Publication of CN106405200A publication Critical patent/CN106405200A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/04Measuring peak values or amplitude or envelope of ac or of pulses

Abstract

The invention provides a peak current detection method, a peak current detection device and a switching power source. The method includes the following steps that: the current value of first current of a first wire region is obtained; the voltage value of first voltage at two ends of the first wire region is obtained when the first current passes through the first wire region; the resistance value of the first wire region is obtained according to the voltage value of the first voltage and the current value of the first current; and peak current is obtained according to the resistance value and working voltage. According to an existing method, a resistor element or a current transformer is adopted to detect peak current; according to the peak current detection method provided by the embodiments of the present invention, the first wire region is measured, so that the peak current can be obtained; and therefore, the peak current detection method of the invention can assist in solving the problems of large amount of emitted heat and unsatisfactory detection effect of the existing peak current detection method.

Description

Peak current detection method, device and Switching Power Supply
Technical field
The present invention relates to field of current measurement, in particular to a kind of peak current detection method, device and switch Power supply.
Background technology
Peak current detection is the key point of Switching Power Supply, and existing peak current detection method is shown often through such as Fig. 1 The current transformer that the resistive element R1 or as shown in Figure 2 L3 and L4 going out forms is detected.
Using resistive element during peak current detection, often cause electricity because the resistance of resistive element is larger Resistance element generates heat so that the service life of Switching Power Supply receives impact.And current transformer input current larger or output account for When sky is higher, it is easily saturated, thus affecting Detection results, and the volume of current transformer is larger, is unfavorable for power module Change development.
Content of the invention
In view of this, a kind of peak current detection method, device and Switching Power Supply are embodiments provided, to change The problem that the detection process heating of kind existing peak current detection method is more, Detection results are undesirable.
For achieving the above object, a kind of peak current detection method, described peak point current inspection are embodiments provided Survey method includes:Obtain the current value of the first electric current being passed through in the first conductor area;Obtain and lead in described first conductor area When entering the first electric current, the magnitude of voltage of the first voltage at two ends of described first conductor area;Voltage according to described first voltage The current value of value and the first electric current obtains the resistance value of the first conductor area;According to running voltage and described first conductor section The resistance value in domain, obtains peak point current.
Preferably, in above-mentioned peak current detection method, methods described also includes:Obtain described first conductor area First temperature;When the first temperature according to described first conductor area and the first temperature, the of the two ends of the first conductor area One magnitude of voltage, obtain second temperature when, the second voltage value at the two ends of the first conductor area, and using described second voltage value as The magnitude of voltage of described running voltage;Magnitude of voltage according to running voltage and the resistance value of described first conductor area, obtain peak Value electric current.
Obtain the first temperature value of the first conductor area, this first temperature value can be specifically the reality of the first conductor area Temperature value.Because magnitude of voltage may change with the change of temperature, therefore the first temperature value can be obtained, and the first temperature Under first voltage value, and second temperature corresponding second voltage value is obtained according to the first temperature value and first voltage value, the Two temperature can be specifically ambient temperature or measurement the first conductor area resistance when, the temperature of the first conductor area.
Can using second temperature value as above-mentioned running voltage magnitude of voltage, and the magnitude of voltage according to running voltage and The resistance value of the first conductor area, obtains peak point current.The impact that temperature drift brings is reduced by this kind of method, is conducive to carrying The accuracy of high measurement.
It is appreciated that it is also possible to reduce the impact of temperature drift by other conventional methods, less temperature drift band It is limitation of the present invention that the concrete measure of the impact coming should not be construed.
Preferably, in above-mentioned peak current detection method, described first temperature is the reality of described first conductor area Temperature.
First temperature is specifically as follows the actual temperature of the first conductor area, because magnitude of voltage can be with the change of temperature Change, therefore in order to reduce the impact that temperature drift measures to peak point current, it is possible to obtain the first wire obtaining during actual temperature The magnitude of voltage at the two ends in region, and it is transformed into magnitude of voltage during other temperature.
Preferably, in above-mentioned peak current detection method, methods described also includes:In the electricity obtaining the first conductor area During resistance, obtain the temperature value of the first conductor area, this temperature value is the operating temperature of the first conductor area.
The temperature value of the first conductor area can be obtained when detecting the resistance value of the first conductor area, and by this temperature value Operating temperature as the first conductor area.Therefore after measuring the magnitude of voltage at the first conductor area two ends during actual temperature value, will be upper When the magnitude of voltage stated is converted into operating temperature, the magnitude of voltage at the first conductor area two ends.
Preferably, in above-mentioned peak current detection method, described second temperature is the work of described first conductor area Temperature.
Second temperature can think above-mentioned operating temperature.
Embodiments provide a kind of peak current detection device, including voltage checking chip and controller, described Controller is connected with described voltage checking chip, and described controller is used for obtaining the first electric current being passed through in the first conductor area Current value;Described voltage checking chip is used for obtaining when described first conductor area is passed through the first electric current, and described first leads The magnitude of voltage of the first voltage at the two ends in line region, and the magnitude of voltage of described first voltage is sent to controller;Described control Device is for the resistance value of current value acquisition first conductor area of the magnitude of voltage according to described first voltage and the first electric current;Institute State the resistance value that controller is additionally operable to according to running voltage and described first conductor area, obtain peak point current.
Preferably, in above-mentioned peak current detection device, also include temperature sensor, described temperature sensor is used for obtaining Obtain the first temperature of described first conductor area, and described first temperature is sent to described controller;Described controller is used for When the first temperature according to described first conductor area and the first temperature, the first voltage value at the two ends of the first conductor area, When obtaining second temperature, the second voltage value at the two ends of the first conductor area, and using described second voltage value as described work The magnitude of voltage of voltage;Described controller is additionally operable to the resistance of magnitude of voltage according to running voltage and described first conductor area Value, obtains peak point current.
When measuring the both end voltage of the first conductor area, now the first conductor area can be obtained by temperature sensor The first temperature, and this first temperature is sent to controller.
And the controller then magnitude of voltage according to the two ends of the first conductor area when the first temperature and the first temperature, obtain the During two temperature, the second voltage value at the first conductor area two ends.This second voltage value can be used as the magnitude of voltage of running voltage.Will First that during the first temperature, the magnitude of voltage at the two ends of the first conductor area of (during actual temperature) is converted to during second temperature is led The magnitude of voltage at the two ends in line region.
Specifically, during the resistance that second temperature is specifically as follows room temperature or measures the first conductor area, first leads The temperature in line region.Why second temperature specifically should not be construed is limitation of the present invention.
Using the magnitude of voltage at the two ends of the first conductor area during second temperature as running voltage magnitude of voltage.Controller root According to the magnitude of voltage of running voltage and the resistance value of the first conductor area, obtain peak point current.
Preferably, in above-mentioned peak current detection device, described temperature sensor is additionally operable to obtaining the first conductor section During the resistance value in domain, obtain the temperature value of the first conductor area.
When obtaining the resistance value of the first conductor area, temperature sensor is additionally operable to obtain the temperature of the first conductor area Value.
Preferably, in above-mentioned peak current detection device, described voltage checking chip is OPA365 chip.
Voltage checking chip is specifically as follows OPA365 chip, and this chip is high accuracy, the voltage checking chip of high speed, makes The magnitude of voltage at the two ends of the first conductor area can preferably be measured with this chip.
The embodiment of the present invention additionally provides a kind of Switching Power Supply, and this switching voltage includes above-mentioned peak current detection dress Put.
The having the beneficial effect that of peak current detection method provided in an embodiment of the present invention, device and Switching Power Supply:
Peak current detection method provided in an embodiment of the present invention, device and Switching Power Supply are passed through to obtain the first conductor section The current value of first electric current in domain, and when obtaining the first conductor area and being passed through the first electric current, the first of the first conductor area two ends The magnitude of voltage of voltage.The current value of the magnitude of voltage according to first voltage and the first electric current obtains the resistance of the first conductor area Value.And peak point current is obtained according to above-mentioned resistance value and running voltage.With existing use resistive element or Current Mutual Inductance The method of device detection detection peak point current is compared, and the embodiment of the present invention is by measuring thus obtaining peak to the first conductor area Value electric current, the detection process heating improving existing peak current detection method is more, problem that Detection results are undesirable.
Brief description
For the clearer explanation embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of partial circuit diagram of existing peak current detection device;
Fig. 2 is the partial circuit diagram of another kind of existing peak current detection device;
Fig. 3 is the partial circuit diagram of peak current detection device provided in an embodiment of the present invention;
Fig. 4 is the structured flowchart of peak current detection device provided in an embodiment of the present invention;
Fig. 5 is the flow chart of peak current detection method provided in an embodiment of the present invention;
Fig. 6 is the flow chart of the concrete steps of step S400 shown in Fig. 5;
Fig. 7 is a kind of flow chart of specific embodiment of peak current detection method provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Ground description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Right below The detailed description of the embodiments of the invention providing in the accompanying drawings is not intended to limit the scope of claimed invention, but It is merely representative of the selected embodiment of the present invention.Based on embodiments of the invention, those skilled in the art are not making creativeness The every other embodiment being obtained on the premise of work, broadly falls into the scope of protection of the invention.
Embodiment
Details refer to Fig. 5, the flow chart that Fig. 5 shows peak current detection method provided in an embodiment of the present invention, bag Include following steps:
Step S100, obtains the current value of the first electric current being passed through in the first conductor area.
Fig. 3 is the partial circuit diagram of peak current detection device 100 provided in an embodiment of the present invention, and Fig. 4 is that the present invention is real Apply the structured flowchart that the peak current detection device 100 of example offer provides, details refer to Fig. 3 and Fig. 4, in the first conductor area It is passed through the first electric current, the first electric current can be specifically electric current known to current value it is also possible to be obtained by controller 110 in R2.
The mode that controller 110 obtains can be obtained it is also possible to be obtained by way of user input for controller 110 measurement Obtain it will be appreciated that it is limitation of the present invention that the concrete mode of the acquisition of the current value of the first electric current should not be construed.
Step S200, obtains when described first conductor area R2 is passed through the first electric current, described first conductor area R2 The magnitude of voltage of the first voltage at two ends.
Specifically first can be obtained and lead using voltage checking chip 120 when the first conductor area R2 is passed through the first electric current The magnitude of voltage of the first voltage at two ends of line region R2.
This voltage checking chip 120 is specifically as follows OPA365 chip U1, and OPA365 chip U1 is a kind of high accuracy, at a high speed Voltage checking chip 120.It is of course also possible to using other voltage checking chip.The particular type of voltage checking chip 120 Should not be construed is the restriction to the embodiment of the present invention.
Step S300, the current value of the magnitude of voltage according to described first voltage and the first electric current obtains the first conductor area The resistance value of R2.
Controller 110 obtains the magnitude of voltage of first voltage and the current value of the first electric current, and according to first voltage Magnitude of voltage and the current value of the first electric current, obtain the resistance value of the first conductor area R2.
Step S400, according to the resistance value of running voltage and described first conductor area R2, obtains peak point current.
After obtaining the resistance value of the first conductor area R2, it is passed through running voltage to the first conductor area R2, using above-mentioned Voltage checking chip 120 obtain the magnitude of voltage of running voltage, and the first wire obtaining according to step S100 to step S300 The resistance value of region R2, obtains peak point current.
Details refer to Fig. 6, and Fig. 6 shows the concrete steps of step S400 in Fig. 5:
Step S410, obtains the first temperature of described first conductor area R2.
The first temperature of the first conductor area R2 specifically can be obtained using temperature sensor 130, temperature sensor 130 obtains After obtaining the first temperature of the first conductor area R2, the temperature data of the first temperature is sent to controller 110.
First temperature is specifically as follows the actual temperature of the first conductor area R2.
Step S420, when the first temperature according to described first conductor area R2 and the first temperature, the first conductor area The first voltage value at the two ends of R2, when obtaining second temperature, the second voltage value at the two ends of the first conductor area R2, and will be described Second voltage value is as the magnitude of voltage of described running voltage.
According to the actual temperature of the first conductor area R2, and the first voltage in actual temperature for first conductor area R2 Value, when obtaining second temperature, the second voltage value at the two ends of the first conductor area R2, can be using second voltage value as work The magnitude of voltage of voltage.
Second temperature is specifically as follows:Temperature value in step S300, during the resistance value of measurement the first conductor area R2. So that the resistance value of the first conductor area R2 and magnitude of voltage are to obtain in same temperature, be conducive to reducing temperature drift to survey The impact of amount result.
Step S430, the resistance value of the magnitude of voltage according to running voltage and described first conductor area R2, obtain peak value Electric current.
The resistance value of the magnitude of voltage of running voltage and the first conductor area R2 be same temperature under magnitude of voltage and Resistance value, therefore the resistance value of the magnitude of voltage according to running voltage and the first conductor area R2 can obtain peak point current.
Details refer to Fig. 7, and Fig. 7 shows that one kind of peak current detection method provided in an embodiment of the present invention is specifically real The flow chart applying mode, comprises the steps:
Step S100, obtains the current value of the first electric current being passed through in the first conductor area R2.
Step S200, obtains when described first conductor area R2 is passed through the first electric current, described first conductor area R2 The magnitude of voltage of the first voltage at two ends.
Step S300, the current value of the magnitude of voltage according to described first voltage and the first electric current obtains the first conductor area The resistance value of R2.
Step S100 is identical to step S300 with step S100 shown in Fig. 5 to step S300, and here does not just repeat.
Step S310, when obtaining the resistance value of the first conductor area R2, obtains the temperature value of the first conductor area R2, should Temperature value is the operating temperature of the first conductor area R2.
When obtaining the resistance value of the first conductor area R2, temperature sensor 130 can obtain this first conductor section simultaneously The temperature value of domain R2, this temperature value can be used as the operating temperature of the first conductor area R2.
Step S410, obtains the first temperature of described first conductor area R2.
First temperature is specifically as follows the actual temperature of the first conductor area R2.
Step S420, when the first temperature according to described first conductor area R2 and the first temperature, the first conductor area The first voltage value at the two ends of R2, when obtaining second temperature, the second voltage value at the two ends of the first conductor area R2, and will be described As the magnitude of voltage of described running voltage, second temperature is the operating temperature of described first conductor area R2 to second voltage value.
According to the actual temperature of the first conductor area R2, and the first voltage in actual temperature for first conductor area R2 Value, when obtaining second temperature, the second voltage value at the two ends of the first conductor area R2.Described second temperature can be step During the resistance value of acquisition first conductor area R2 in S310, the temperature of the first conductor area R2.
Step S430, the resistance value of the magnitude of voltage according to running voltage and described first conductor area R2, obtain peak value Electric current.
The resistance value of the magnitude of voltage of running voltage and the first conductor area R2 be same temperature under magnitude of voltage and Resistance value, therefore the resistance value of the magnitude of voltage according to running voltage and the first conductor area R2 can obtain peak point current.
Peak current detection method provided in an embodiment of the present invention is passed through to obtain the first electric current of the first conductor area R2 The magnitude of voltage of current value and first voltage corresponding with the first electric current obtains the resistance value of the first conductor area R2.Obtaining electricity The temperature value of now the first conductor area R2 during resistance, can be obtained, as operating temperature simultaneously.Then obtain first to lead The actual temperature of line region R2, and obtained according to the first voltage value of the first conductor area R2 when actual temperature and actual temperature The second voltage value of the first conductor area R2 during operating temperature, this second voltage value is the magnitude of voltage of running voltage.Subsequently basis The resistance value of running voltage and the first conductor area R2 can obtain peak point current, with existing peak current detection method phase Peak current detection method provided in an embodiment of the present invention directly detects ratio to wire, can improve existing peak value electricity The problem that the detection process heating of stream detection method is more, Detection results are undesirable.
Details refer to Fig. 4, and Fig. 4 shows the structural frames of peak current detection device 100 provided in an embodiment of the present invention Figure.This peak current detection device 100 includes voltage checking chip 120 and controller 110, described controller 110 and described electricity Pressure detection chip 120 is connected.
Described controller 110 is used for obtaining the current value of the first electric current being passed through in the first conductor area R2.
Specifically, the first electric current can be passed through in the first conductor area R2, the first electric current can be specifically current value The electric current known is it is also possible to be obtained by controller 110110.
The mode that controller 110 obtains can be obtained it is also possible to be obtained by way of user input for controller 110 measurement Obtain it will be appreciated that it is limitation of the present invention that the concrete mode of the acquisition of the current value of the first electric current should not be construed.
Described voltage checking chip 120 is used for obtaining when described first conductor area R2 is passed through the first electric current, and described the The magnitude of voltage of the first voltage at the two ends of one conductor area R2, and the magnitude of voltage of described first voltage is sent to controller 110.
This voltage checking chip 120 is specifically as follows OPA365 chip, is the voltage checking chip of a kind of high accuracy, high speed 120.It is of course also possible to using other voltage checking chip 120.The particular type of voltage checking chip 120 should not be understood For being the restriction to the embodiment of the present invention.
Described controller 110 obtains first for the current value of the magnitude of voltage according to described first voltage and the first electric current The resistance value of conductor area R2.
Controller 110 obtains the magnitude of voltage of first voltage and the current value of the first electric current, and according to first voltage Magnitude of voltage and the current value of the first electric current, obtain the resistance value of the first conductor area R2.
Described controller 110 is additionally operable to the resistance value according to running voltage and described first conductor area R2, obtains peak Value electric current.
It is passed through running voltage to the first conductor area R2, specifically can obtain work using voltage checking chip 120 detection The magnitude of voltage of voltage, and this magnitude of voltage is sent to controller 110, controller 110 is according to the magnitude of voltage of running voltage, Yi Ji The resistance value of one conductor area R2, obtains peak point current.
This peak current detection device 100 also includes temperature sensor 130, described temperature sensor 130 and controller 110 It is connected, details refer to Fig. 4.
Described temperature sensor 130 is used for obtaining the first temperature of described first conductor area R2, and warm by described first Degree sends to described controller 110;
Described temperature sensor 130 is additionally operable to, when obtaining the resistance value of the first conductor area R2, obtain the first conductor section The temperature value of domain R2.
First temperature is specifically as follows the actual temperature of the first conductor area R2.
When described controller 110 is used for the first temperature and the first temperature according to described first conductor area R2, first The first voltage value at the two ends of conductor area R2, when obtaining second temperature, the second voltage value at the two ends of the first conductor area R2, And using described second voltage value as described running voltage magnitude of voltage.
According to the actual temperature of the first conductor area R2, and the first voltage in actual temperature for first conductor area R2 Value, when obtaining second temperature, the second voltage value at the two ends of the first conductor area R2, can be using second voltage value as work The magnitude of voltage of voltage.
Second temperature is specifically as follows:Measure the first conductor area R2 resistance value when temperature value.So that first The resistance value of conductor area R2 and magnitude of voltage are to obtain in same temperature, are conducive to reducing the shadow to measurement result for the temperature drift Ring.
Described controller 110 is additionally operable to the resistance of magnitude of voltage according to running voltage and described first conductor area R2 Value, obtains peak point current.
The resistance value of the magnitude of voltage of running voltage and the first conductor area R2 be same temperature under magnitude of voltage and Resistance value, therefore the resistance value of the magnitude of voltage according to running voltage and the first conductor area R2 can obtain peak point current.
The embodiment of the present invention additionally provides a kind of Switching Power Supply, and this Switching Power Supply includes above-mentioned peak current detection device 100.
Peak current detection method provided in an embodiment of the present invention, device and Switching Power Supply are passed through to obtain the first conductor section The current value of first electric current of domain R2, and when obtaining the first conductor area R2 and being passed through the first electric current, the first conductor area R2 two ends First voltage magnitude of voltage.The current value of the magnitude of voltage according to first voltage and the first electric current obtains the first conductor area R2 Resistance value.And peak point current is obtained according to above-mentioned resistance value and running voltage.With existing use resistive element or electricity Current transformer detection detection peak point current method compare, the embodiment of the present invention directly the first conductor area R2 is measured from And obtaining peak point current, the detection process more, Detection results of heating improving existing peak current detection method are undesirable Problem.
It should be understood that disclosed device is it is also possible to by another way in embodiment provided herein Realize.Device embodiment described above is only schematically.
In addition, each functional module in embodiments of the present invention can integrate one independent part of formation, Can be modules individualism it is also possible to two or more modules are integrated to form an independent part.
If described function realized using in the form of software function module and as independent production marketing or use when, permissible It is stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words Partly being embodied in the form of software product of part that prior art is contributed or this technical scheme, this meter Calculation machine software product is stored in a storage medium, including some instructions with so that a computer equipment (can be individual People's computer, server, or network equipment etc.) execution each embodiment of the present invention all or part of step.And it is aforesaid Storage medium includes:USB flash disk, portable hard drive, read only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.Need explanation , herein, such as first and second or the like relational terms be used merely to by an entity or operation with another Individual entity or operation make a distinction, and not necessarily require or imply there is any this reality between these entities or operation Relation or order.And, term " inclusion ", "comprising" or its any other variant are intended to comprising of nonexcludability, So that including a series of process of key elements, article or equipment not only include those key elements, but also include not clearly Other key elements listed, or also include for this process, article or the intrinsic key element of equipment.There is no more restrictions In the case of, the key element that limited by sentence "including a ..." it is not excluded that include the process of described key element, article or Also there is other identical element in equipment.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made any repair Change, equivalent, improvement etc., should be included within the scope of the present invention.It should be noted that:Similar label and letter exist Representing similar terms in figure below, therefore, once being defined in a certain Xiang Yi accompanying drawing, being then not required in subsequent accompanying drawing It is defined further and to be explained.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, all should contain Cover within protection scope of the present invention.Therefore, protection scope of the present invention should described be defined by scope of the claims.

Claims (10)

1. a kind of peak current detection method is it is characterised in that methods described includes:
Obtain the current value of the first electric current being passed through in the first conductor area;
Obtain when described first conductor area is passed through the first electric current, the electricity of the first voltage at two ends of described first conductor area Pressure value;
The current value of the magnitude of voltage according to described first voltage and the first electric current obtains the resistance value of the first conductor area;
According to the resistance value of running voltage and described first conductor area, obtain peak point current.
2. method according to claim 1 it is characterised in that described according to running voltage and described first conductor area Resistance value, obtain peak point current, including:
Obtain the first temperature of described first conductor area;
When the first temperature according to described first conductor area and the first temperature, the first voltage at the two ends of the first conductor area Value, when obtaining second temperature, the second voltage value at the two ends of the first conductor area, and using described second voltage value as described work Make the magnitude of voltage of voltage;
Magnitude of voltage according to running voltage and the resistance value of described first conductor area, obtain peak point current.
3. method according to claim 2 is it is characterised in that described first temperature is the reality of described first conductor area Temperature.
4. method according to claim 2 is it is characterised in that methods described also includes:
When obtaining the resistance value of the first conductor area, obtain the temperature value of the first conductor area, this temperature value is the first wire The operating temperature in region.
5. method according to claim 4 is it is characterised in that described second temperature is the work of described first conductor area Temperature.
6. a kind of peak current detection device is it is characterised in that include voltage checking chip and controller, described controller and institute State voltage checking chip to be connected,
Described controller is used for obtaining the current value of the first electric current being passed through in the first conductor area;
Described voltage checking chip is used for obtaining when described first conductor area is passed through the first electric current, described first conductor area The first voltage at two ends magnitude of voltage, and the magnitude of voltage of described first voltage is sent to controller;
Described controller obtains the first conductor section for the current value of the magnitude of voltage according to described first voltage and the first electric current The resistance value in domain;
Described controller is additionally operable to the resistance value according to running voltage and described first conductor area, obtains peak point current.
7. peak current detection device according to claim 6 is it is characterised in that also include temperature sensor,
Described temperature sensor is used for obtaining the first temperature of described first conductor area, and described first temperature is sent to institute State controller;
When described controller is used for the first temperature and the first temperature according to described first conductor area, the first conductor area The first voltage value at two ends, when obtaining second temperature, the second voltage value at the two ends of the first conductor area, and electric by described second Pressure value is as the magnitude of voltage of described running voltage;
Described controller is additionally operable to the resistance value of magnitude of voltage according to running voltage and described first conductor area, obtains peak value Electric current.
8. peak current detection device according to claim 7 is it is characterised in that described temperature sensor is additionally operable to obtaining Take the first conductor area resistance value when, obtain the first conductor area temperature value.
9. peak current detection device according to claim 6 is it is characterised in that described voltage checking chip is OPA365 Chip.
10. a kind of Switching Power Supply is it is characterised in that include the peak current detection dress as described in any one of claim 6 to 9 Put.
CN201610796061.2A 2016-08-31 2016-08-31 Peak current detection method, device and switching power source Pending CN106405200A (en)

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