CN115236381A - Circuit for measuring and calculating micro-current of computer mainboard, measuring and calculating method and circuit equipment - Google Patents
Circuit for measuring and calculating micro-current of computer mainboard, measuring and calculating method and circuit equipment Download PDFInfo
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- CN115236381A CN115236381A CN202210855652.8A CN202210855652A CN115236381A CN 115236381 A CN115236381 A CN 115236381A CN 202210855652 A CN202210855652 A CN 202210855652A CN 115236381 A CN115236381 A CN 115236381A
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Abstract
The application discloses a circuit for measuring and calculating micro-current of a computer mainboard, which comprises a precision resistor, a ground resistor, a constant current source and a voltage drop measuring and calculating module, wherein a first logic switch is arranged at the input end of the precision resistor, the first logic switch can be selectively and electrically connected with a notebook battery pack or the constant current source, a second logic switch is arranged at the output end of the precision resistor, the second logic switch can be selectively and electrically connected with the computer mainboard or the ground resistor, a voltage drop measuring and calculating module is arranged on the precision resistor, the voltage drop measuring and calculating module is used for detecting the change of the voltage drop on the precision resistor and further measuring and calculating the micro-current output value of the notebook battery pack, and a measuring and calculating method and calculating circuit device corresponding to the measuring and calculating circuit are further disclosed.
Description
Technical Field
The application relates to the technical field of computer micro-current measurement and calculation, in particular to a circuit for measuring and calculating micro-current of a computer mainboard, a measurement and calculation method and circuit equipment.
Background
A Notebook (Notebook Computer), also called a portable Computer, is a personal Computer which has a small and exquisite body and is convenient to carry, and the body of the Notebook is very portable, can completely perform daily operation and basic business, entertainment and operation operations, and is popular and popular with people. In the production process of the notebook computer, in order to ensure that a terminal user can normally shut down the notebook computer when taking the notebook computer, the notebook computer needs to be controlled to enter a shipmode in the shipment quality inspection process, namely, in the shipment transportation state of the machine, and only extremely low current output is adopted to supply power for a real-time clock chip (RTC). How to ensure the extremely low output of the computer Battery, the following two schemes are often adopted in the prior art, wherein the first scheme is a mode of simultaneously supplying power by adopting an intelligent Battery (Smart Battery) and a real-time clock Battery (RTC Battery), and in the shipping and transportation state of the machine, the computer system of the notebook computer is in a long-term shutdown state, the intelligent Battery can automatically cut off the power and the RTC Battery supplies power independently; in the second scheme, a non-intelligent battery is adopted, so that the computer system enters a G3 state (namely a standby state of the notebook) after being shut down, and micro-current of the muA level is used for respectively supplying power to the CPU and the RTC.
And when the second scheme is adopted, the micro-current provided by the computer system for the computer mainboard by the battery pack in the G3 state needs to be measured to judge whether the notebook computer meets the delivery requirement, the prior art adopts a universal meter direct measurement method for measurement and calculation, and the defects that the measurement and calculation are inconvenient, the measurement result is inaccurate, and the universal meter is easy to damage when the measurement and calculation are not proper exist, so that the quality inspection efficiency and the quality inspection quality of the process of measuring and calculating the micro-current of the delivery of the existing notebook computer are low.
Disclosure of Invention
The purpose of the application is to provide a circuit machine measuring and calculating method and circuit equipment for measuring and calculating micro-current of a computer mainboard, aiming at quickly, conveniently, accurately and safely measuring the current provided by a battery pack for the mainboard in a computer shutdown state and judging whether the current meets the delivery requirement or not so as to guarantee the delivery quality and improve the quality inspection efficiency.
Specifically, the above object of the present application is achieved by the following technical solutions: the application first aspect provides a circuit for calculating little current of computer motherboard, including accurate resistance, ground resistance, constant current source and pressure drop calculation module, the input of accurate resistance is provided with first logic switch, first logic switch selectivity is connected with notebook battery package or constant current source electricity, the output of accurate resistance is provided with the second logic switch, second logic switch selectivity is connected with the computer motherboard or ground resistance electricity, be provided with the pressure drop calculation module on the accurate resistance, the pressure drop is calculated the module and is used for detecting the change of pressure drop on the accurate resistance, and then the calculation little current output value of notebook battery package.
As an improvement of the scheme of the application, the voltage drop measuring and calculating module comprises a sampling circuit, an amplifying circuit and a logic control circuit; the amplifying circuit is used for collecting and amplifying current signals at two ends of the precision resistor, the sampling circuit is used for converting the current signals amplified by the amplifying circuit into voltage signals, and the logic control circuit is used for measuring and calculating the change of voltage drop on the precision resistor according to the voltage signals and further measuring and calculating the micro-current output value of the notebook battery pack.
As an improvement of the present application, the amplifying circuit includes a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor; the input end of the precision resistor is grounded sequentially through the first resistor, the second resistor and the third resistor, and the output end of the precision resistor is grounded sequentially through the fourth resistor, the fifth resistor and the sixth resistor; the non-inverting input end of the first operational amplifier is connected between the second resistor and the third resistor, the output end of the first operational amplifier is connected with the first sampling end of the sampling circuit, and the inverting input end of the first operational amplifier is connected between the output end of the first operational amplifier and the first sampling end of the sampling circuit; the non-inverting input end of the second operational amplifier is connected between the fifth resistor and the sixth resistor, the output end of the second operational amplifier is connected with the second sampling end of the sampling circuit, and the inverting input end of the second operational amplifier is connected between the output end of the second operational amplifier and the second sampling end of the sampling circuit.
As an improvement of the scheme of the application, the sampling circuit comprises a first voltage sampling resistor and a second voltage sampling resistor; the first voltage sampling resistor is connected between the output end of the first operational amplifier and the first voltage sampling end of the logic control circuit, and the second voltage sampling resistor is connected between the output end of the second operational amplifier and the second voltage sampling end of the logic control circuit.
The second aspect of the present application provides a method for measuring and calculating a micro-current of a motherboard of a computer, which specifically includes the following steps:
s1, controlling the first logic switch to be electrically connected with the constant current source, controlling the second logic switch to be electrically connected with the ground resistor, measuring and calculating a voltage value at two ends of the precision resistor by the voltage drop measuring and calculating module, and disconnecting the first logic switch and the second logic switch;
s2, controlling the first logic switch to be electrically connected with the computer battery pack, controlling the second logic switch to be electrically connected with the computer mainboard, measuring and calculating a voltage value at two ends of the precision resistor by the voltage drop measuring and calculating module, and disconnecting the first logic switch and the second logic switch;
and S3, the voltage drop measuring and calculating module measures and calculates the current output value of the computer battery pack according to the voltage value change at the two ends of the precision resistor.
As an improvement of the scheme of the present application, the step S3 specifically includes: the current output value of the computer battery pack is measured by comparing the ratio of the voltage drop generated by the constant current source and the micro-current output value on the precision resistor, and the formula is as follows:
U a /I a ＝U t /I t ＝R
wherein, U a Is the voltage value, I, across the precision resistor in step S1 a Is the output current value of the constant current source, U t For the precision in step S2Voltage value across the resistor, I t And R is the current output value of the computer battery pack, and R is the resistance value of the precision resistor.
The third aspect of the application provides a circuit device for measuring and calculating micro-current of a computer mainboard, which is specially used for detecting the quality of output goods after the notebook computer is manufactured and produced. The circuit equipment comprises the measuring and calculating circuit disclosed by the first aspect of the application and further comprises a display, the display is electrically connected with the voltage drop measuring and calculating module, and the display is used for displaying the voltage values at two ends of the precision resistor and the micro-current output value of the computer battery pack.
Compare in prior art, this application's beneficial effect does: the method and the device adopt the discharge of the measured current to the resistor and the discharge of the constant-current source resistor to the resistor, measure the voltage drop generated on the resistor to calculate the magnitude of the measured current, measure and calculate the speed block, have high measurement and calculation precision, and can obviously improve the quality inspection efficiency and the quality inspection quality.
Drawings
The present application will now be described with reference to the accompanying drawings. The drawings in the present application are for the purpose of illustrating embodiments only. Other embodiments can be readily made by those skilled in the art from the following description of the steps described without departing from the principles of the present application.
FIG. 1 is a schematic diagram of a circuit for measuring micro-current of a computer motherboard according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a circuit for measuring micro-current of a computer motherboard according to another embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second", etc. in this application are used to distinguish different objects, and are not used to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
Example 1:
referring to fig. 1, the present embodiment provides a circuit for measuring and calculating a micro-current of a computer motherboard, including a precision resistor RB1, a ground resistance RL0, a constant current source 4, and a voltage drop measuring and calculating module 5, where an input end of the precision resistor RB1 is provided with a first logic switch 6, the first logic switch 6 is selectively electrically connected to a notebook battery pack or the constant current source 4, an output end of the precision resistor RB1 is provided with a second logic switch 7, the second logic switch 7 is selectively electrically connected to the computer motherboard 3 or the ground resistance RL0, the precision resistor RB1 is provided with the voltage drop measuring and calculating module 5, and the voltage drop measuring and calculating module 5 is configured to detect a change in voltage drop across the precision resistor RB1, and further measure and calculate a micro-current output value of the notebook battery pack.
The working principle of this application does: the method for calculating the current in proportion through the constant current source 4 is adopted, the method is applied to the measurement of the micro-current output value of a computer, firstly, a logic switch switches a circuit to a circuit of a battery pack, namely a precision resistor RB1 and a mainboard 3, and the voltage at two ends of the precision resistor RB1 is detected circularly and recorded; then the loop is switched to a circuit of a constant current source 4, a precision resistor RB1 and a ground resistance RL0, and then the voltage at the two precision ends is detected in a circulating mode and recorded. And calculating the voltage difference of the precision resistors RB1 on the two loops, and calculating the current value of the loop of the battery pack, namely the precision resistor RB1, and the mainboard 3 according to the proportion of the voltage difference, so as to finally obtain the output value of the micro-current on the computer battery pack 1. Therefore, the method adopts the discharge of the measured current to the resistor and the discharge of the constant current source 4 to the resistor, and simultaneously measures the voltage drop generated on the resistor to calculate the magnitude of the measured current, measures and calculates the speed block, has high measuring and calculating precision, and can obviously improve the quality inspection efficiency and the quality inspection quality.
As a preferred embodiment of the present application, referring to fig. 1, the voltage drop measuring and calculating module 5 includes a sampling circuit 9, an amplifying circuit 10 and a logic control circuit 11; the amplifying circuit 10 is used for collecting and amplifying current signals at two ends of the precision resistor RB1, the sampling circuit 9 is used for converting the current signals amplified by the amplifying circuit 10 into voltage signals, and the logic control circuit 11 is used for measuring and calculating the change of voltage drop on the precision resistor RB1 according to the voltage signals and further measuring and calculating the micro-current output value of the notebook battery pack.
As a preferred embodiment of the present application, referring to fig. 2, the amplifying circuit 10 includes a first operational amplifier PU1A, a second operational amplifier PU1B, a first resistor PR2, a second resistor PR3, a third resistor PR7, a fourth resistor PR1, a fifth resistor PR4, and a sixth resistor PR8; the input end of the precision resistor RB1 is grounded sequentially through the first resistor PR2, the second resistor PR3 and the third resistor PR7, and the output end of the precision resistor RB1 is grounded sequentially through the fourth resistor PR1, the fifth resistor PR4 and the sixth resistor PR8; the non-inverting input end of the first operational amplifier PU1A is connected between the second resistor PR3 and the third resistor PR7, the output end of the first operational amplifier PU1A is connected with the first sampling end of the sampling circuit 9, and the inverting input end of the first operational amplifier PU1A is connected between the output end of the first operational amplifier PU1A and the first sampling end of the sampling circuit 9; the non-inverting input end of the second operational amplifier PU1B is connected between the fifth resistor PR4 and the sixth resistor PR8, the output end of the second operational amplifier PU1B is connected with the second sampling end of the sampling circuit 9, and the inverting input end of the second operational amplifier PU1B is connected between the output end of the second operational amplifier PU1B and the second sampling end of the sampling circuit 9.
As a preferred embodiment of the present application, referring to fig. 2, the sampling circuit 9 includes a first voltage sampling resistor PR6 and a second voltage sampling resistor PR5; the first voltage sampling resistor PR6 is connected between the output end of the first operational amplifier PU1A and the first voltage sampling end of the logic control circuit 11, and the second voltage sampling resistor PR5 is connected between the output end of the second operational amplifier PU1B and the second voltage sampling end of the logic control circuit 11.
Example 2:
the application also discloses a measuring and calculating method of the circuit for measuring and calculating the micro-current of the mainboard of the computer aiming at the measuring and calculating circuit of the application, which comprises the following steps:
the method comprises the following steps of S1, controlling the first logic switch 6 to be electrically connected with the constant current source 4, controlling the second logic switch 7 to be electrically connected with the ground resistor RL0, measuring and calculating a voltage value at two ends of the precision resistor RB1 by the voltage drop measuring and calculating module 5, and disconnecting the first logic switch 6 and the second logic switch 7;
s2, controlling the first logic switch 6 to be electrically connected with the computer battery pack 1, controlling the second logic switch 7 to be electrically connected with the computer mainboard, measuring and calculating a voltage value at two ends of the precision resistor RB1 by the voltage drop measuring and calculating module 5, and disconnecting the first logic switch 6 and the second logic switch 7;
and S3, the voltage drop measuring and calculating module 5 measures and calculates the current output value of the computer battery pack 1 according to the voltage value change at the two ends of the precision resistor RB 1.
As a preferred embodiment of the present application, the step S3 specifically includes: the current output value of the computer battery pack 1 is measured by comparing the constant current source 4 and the voltage drop generated by the micro-current output value on the precision resistor RB1, and the formula is as follows:
U a /I a ＝U t /I t ＝R
wherein, U a Is the voltage value, I, across the precision resistor RB1 in step S1 a Is the output current value of the constant current source 4, U t Is the voltage value, I, across the precision resistor RB1 in step S2 t The current output value of the computer battery pack 1 is shown, and R is the resistance value of the precision resistor RB 1.
Example 3:
the application also discloses a circuit device for measuring and calculating micro-current of the mainboard of the computer, which is specially used for detecting the quality of the output goods after the notebook computer is manufactured and produced. Referring to fig. 1, the circuit device further includes a display 12, and the monitored value on the voltage drop measuring and calculating module 5 and the measured value of the micro-current output value are displayed by the display 12 and finally determined by a quality inspector.
In another preferred scheme, the notebook computer is further provided with a judging module, the judging module is further provided with a threshold range, and when the micro-current output value is within the threshold range, the notebook computer is judged to be qualified; and when the micro-current output value is not in the threshold range, judging the notebook to be unqualified.
The working principle of this application does: the method for calculating the current in proportion through the constant current source 4 is adopted, the method is applied to the measurement of the micro-current output value of a computer, firstly, a logic switch switches a circuit to a circuit of a battery pack, namely a precision resistor RB1 and a mainboard, and the voltage at two ends of the precision resistor RB1 is detected circularly and recorded at the moment; then the loop is switched to a circuit of a constant current source 4, a precision resistor RB1 and a ground resistance RL0, and then the voltage at the two precision ends is detected in a circulating mode and recorded. The method comprises the steps of calculating the pressure difference of the precision resistors RB1 on two loops, calculating the current value of a battery pack, namely the precision resistors RB1, namely a mainboard on the loop through the proportion of the pressure difference, finally obtaining the output value of micro-current on the computer battery pack 1, judging that the quality of the notebook in the shipment state is detected to be closed when the output value of the micro-current is within the preset threshold range, otherwise judging that the notebook is not qualified, reworking again, and being beneficial to obviously improving the quality inspection efficiency of the notebook in shipment.
The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not intended to limit the scope of the present application, which is defined by the appended claims and their equivalents, and all changes that can be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. The circuit for measuring and calculating the micro-current of the computer mainboard is characterized by comprising a precision resistor, a ground resistor, a constant current source and a voltage drop measuring and calculating module, wherein a first logic switch is arranged at the input end of the precision resistor, the first logic switch can be selectively and electrically connected with a notebook computer mainboard or the ground resistor, a second logic switch is arranged at the output end of the precision resistor, the second logic switch can be selectively and electrically connected with the computer mainboard or the ground resistor, the precision resistor is provided with the voltage drop measuring and calculating module, and the voltage drop measuring and calculating module is used for detecting the change of the voltage drop on the precision resistor so as to measure and calculate the micro-current output value of the notebook computer mainboard.
2. The circuit for measuring and calculating the micro-current of the computer mainboard according to claim 1, wherein the voltage drop measuring and calculating module comprises a sampling circuit, an amplifying circuit and a logic control circuit; the amplifying circuit is used for collecting and amplifying current signals at two ends of the precision resistor, the sampling circuit is used for converting the current signals amplified by the amplifying circuit into voltage signals, and the logic control circuit is used for measuring and calculating the change of voltage drop on the precision resistor according to the voltage signals and further measuring and calculating the micro-current output value of the notebook battery pack.
3. The circuit for measuring and calculating the micro-current of the computer motherboard according to claim 2, wherein the amplifying circuit comprises a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; the input end of the precision resistor is grounded sequentially through the first resistor, the second resistor and the third resistor, and the output end of the precision resistor is grounded sequentially through the fourth resistor, the fifth resistor and the sixth resistor; the non-inverting input end of the first operational amplifier is connected between the second resistor and the third resistor, the output end of the first operational amplifier is connected with the first sampling end of the sampling circuit, and the inverting input end of the first operational amplifier is connected between the output end of the first operational amplifier and the first sampling end of the sampling circuit; the non-inverting input end of the second operational amplifier is connected between the fifth resistor and the sixth resistor, the output end of the second operational amplifier is connected with the second sampling end of the sampling circuit, and the inverting input end of the second operational amplifier is connected between the output end of the second operational amplifier and the second sampling end of the sampling circuit.
4. The circuit for measuring and calculating the micro-current of the mainboard of the computer, according to claim 3, wherein the sampling circuit comprises a first voltage sampling resistor and a second voltage sampling resistor; the first voltage sampling resistor is connected between the output end of the first operational amplifier and the first voltage sampling end of the logic control circuit, and the second voltage sampling resistor is connected between the output end of the second operational amplifier and the second voltage sampling end of the logic control circuit.
5. A measuring and calculating method for a circuit for measuring and calculating micro-current of a computer mainboard is characterized by comprising the following steps:
s1, controlling the first logic switch to be electrically connected with the constant current source, controlling the second logic switch to be electrically connected with the ground resistor, measuring and calculating a voltage value of two ends of the precision resistor at the moment by the voltage drop measuring and calculating module, and disconnecting the first logic switch and the second logic switch;
s2, controlling the first logic switch to be electrically connected with the computer battery pack, controlling the second logic switch to be electrically connected with the computer mainboard, measuring and calculating a voltage value at two ends of the precision resistor by the voltage drop measuring and calculating module, and disconnecting the first logic switch and the second logic switch;
and S3, the voltage drop measuring and calculating module measures and calculates the current output value of the computer battery pack according to the voltage value change at the two ends of the precision resistor.
6. The method according to claim 5, wherein the step S3 comprises: the current output value of the computer battery pack is measured by comparing the ratio of the voltage drop generated by the constant current source and the micro-current output value on the precision resistor, and the formula is as follows:
Ua/Ia＝Ut/It＝R
wherein Ua is a voltage value at two ends of the precision resistor in step S1, ia is an output current value of a constant current source, ut is a voltage value at two ends of the precision resistor in step S2, it is a current output value of a computer battery pack, and R is a resistance value of the precision resistor.
7. A circuit device for measuring and calculating micro-current of a computer motherboard, comprising the circuit for measuring and calculating micro-current of a computer motherboard according to claims 1 to 4, characterized by further comprising a display, wherein the display is electrically connected with the voltage drop measuring and calculating module, and the display is used for displaying the voltage value at two ends of the precision resistor and the micro-current output value of the computer battery pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210855652.8A CN115236381A (en) | 2022-07-20 | 2022-07-20 | Circuit for measuring and calculating micro-current of computer mainboard, measuring and calculating method and circuit equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210855652.8A CN115236381A (en) | 2022-07-20 | 2022-07-20 | Circuit for measuring and calculating micro-current of computer mainboard, measuring and calculating method and circuit equipment |
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| CN115236381A true CN115236381A (en) | 2022-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210855652.8A Pending CN115236381A (en) | 2022-07-20 | 2022-07-20 | Circuit for measuring and calculating micro-current of computer mainboard, measuring and calculating method and circuit equipment |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101093250A (en) * | 2007-07-20 | 2007-12-26 | 太原市优特奥科电子科技有限公司 | Real time online method and device for monitoring and measuring error of high-voltage current measured through mutual inductance |
| CN101210940A (en) * | 2006-12-26 | 2008-07-02 | 康佳集团股份有限公司 | On-line DC measuring system and method |
| US20150145538A1 (en) * | 2013-11-27 | 2015-05-28 | Infineon Technologies Ag | Circuits and methods for measuring a current |
| CN109387691A (en) * | 2018-12-14 | 2019-02-26 | 中核新科（天津） 精密机械制造有限公司 | The atomic low current linear measuring circuit of femto-ampere grade |
| CN210982594U (en) * | 2019-09-26 | 2020-07-10 | 上海稊米汽车科技有限公司 | Control circuit for monitoring current threshold |
| CN113391111A (en) * | 2021-05-25 | 2021-09-14 | 普源精电科技股份有限公司 | Current detection circuit |
| CN113541449A (en) * | 2021-09-16 | 2021-10-22 | 深圳英集芯科技股份有限公司 | Current detection device and boost conversion system |
-
2022
- 2022-07-20 CN CN202210855652.8A patent/CN115236381A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101210940A (en) * | 2006-12-26 | 2008-07-02 | 康佳集团股份有限公司 | On-line DC measuring system and method |
| CN101093250A (en) * | 2007-07-20 | 2007-12-26 | 太原市优特奥科电子科技有限公司 | Real time online method and device for monitoring and measuring error of high-voltage current measured through mutual inductance |
| US20150145538A1 (en) * | 2013-11-27 | 2015-05-28 | Infineon Technologies Ag | Circuits and methods for measuring a current |
| CN109387691A (en) * | 2018-12-14 | 2019-02-26 | 中核新科（天津） 精密机械制造有限公司 | The atomic low current linear measuring circuit of femto-ampere grade |
| CN210982594U (en) * | 2019-09-26 | 2020-07-10 | 上海稊米汽车科技有限公司 | Control circuit for monitoring current threshold |
| CN113391111A (en) * | 2021-05-25 | 2021-09-14 | 普源精电科技股份有限公司 | Current detection circuit |
| CN113541449A (en) * | 2021-09-16 | 2021-10-22 | 深圳英集芯科技股份有限公司 | Current detection device and boost conversion system |
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