Current sensor and current sensing method
A current sensor and current technology, applied in the direction of measurement using digital measurement technology, can solve the problem of resolution reduction and achieve constant gain, large gain, and high accuracy
Pending Publication Date: 2018-06-29
江西联智集成电路有限公司
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Problems solved by technology
[0008] Relative to the maximum input 21V, because it cannot exceed the input range of the gain controller, the voltage is divided according to the ratio of about 1 / 7, and for example, when the input voltage is 5V, the voltage is also divided according to the ratio of 1 / 7 and input At lower voltages, there is a problem of reduced resolution
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[0027] In the following description, specific structures and descriptions are merely schematic illustrations for easier understanding of the present invention. The present invention can be implemented in various forms and is not limited to the forms described in this specification. In addition, various changes, improvements, etc. can be made to the present invention within the range not exceeding the technical idea of the present invention, and these changes, improvements, etc. are all included in the protection scope of the present invention.
[0028] In addition, terms such as "first" and "second" used in the following description may describe specific components, but these terms do not limit these components. These terms are used only to distinguish each constituent element.
[0029] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
[0030] image 3 is a block diagram showing the current sensor of the present i...
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The invention provides a current sensor and a current sensing method. The current sensor comprises a first voltage supply circuit, a second voltage supply circuit, a current supply circuit, a voltagegeneration circuit and a gain control circuit, wherein the first voltage supply circuit is used for inputting bias current from the exterior, receiving the inputted voltage, and outputting a first voltage; the second voltage supply circuit is used for receiving the inputted voltage, and outputting a second voltage; the current supply circuit is connected with both ends of an external sensing resistor, receiving the first voltage and the second voltage, and outputting a first current and a second current; the voltage generation circuit is used for receiving the first current and the second current, and generating a first control voltage and a second control voltage; the gain control circuit is used for receiving the first control voltage and the second control voltage, and outputting the voltage for an external analog-digital converter.
Description
technical field [0001] The invention relates to a current sensor and a current sensing method which are not affected by input voltage. Background technique [0002] In a wireless charging system, functions such as FOD (Foreign Objects Detection, external object detection) can only be realized by accurately sensing the load current under the input voltage. A current sensor with this capability uses an external small resistive element to sense the current flowing through the resistive element. [0003] figure 1 is a schematic diagram representing current sensing. Usually, the input voltage range of the current sensor used in the wireless charging system is generally 4.5-21V, that is, it works under a very wide input voltage. Therefore, such a current sensor needs to sense current independently of the input voltage. [0004] The current sensor senses the current flowing through the external resistor, senses the voltage across the external resistor, and inputs a voltage prop...
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Login to View More IPC IPC(8): G01R19/25
CPCG01R19/25
Inventor 金晖哲宋垠锡
Owner 江西联智集成电路有限公司