High-precision on-chip power tube current detection circuit
A technology of current detection circuit and power tube, which is applied in the direction of measuring current/voltage, only measuring current, measuring devices, etc., can solve the problems of large power consumption, reduced system efficiency, and low accuracy of detection results, and achieve the effect of improving detection accuracy
Inactive Publication Date: 2021-07-16
海安集成电路技术创新中心 +2
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[0003] One is to use the resistance detection scheme, figure 1 It is a traditional current detection method. The current is detected by connecting a resistor Rsense in series with the power tube. The accuracy of this solution usually meets the requirements, but since the current is generally milliampere current, this solution will generate a lot of power consumption. lead to a decrease in system efficiency;
[0004] The second is to adopt the inductance detection scheme, which increases the difficulty
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[0012] The detection accuracy of the prior art is low. If the detection current is obtained by reducing the MOS tube current to be detected by more than three levels, the accuracy will be greatly improved. Based on this idea, the detection method provided in this embodiment is as follows:
[0013] Step 1, collecting the current of the MOS tube to be detected;
[0014] In step 2, the on-chip MOS transistor detection structure is used to reduce the collected current to more than three levels to obtain the detection current.
[0015] In addition, since the opening and closing of the MOS tube to be detected is determined according to the operating frequency, the higher the frequency, the more frequent its opening and closing. When the on-chip detection structure is turned on again, the power consumption and turn-on time are wasted. In the solution of this embodiment, when the MOS transistor to be detected is turned off, the on-chip MOS transistor detection structure is kept turne...
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The invention discloses a novel structure of a high-precision on-chip power tube current detection circuit. According to the structure, firstly, the current of a to-be-detected MOS tube is collected; an on-chip MOS tube detection structure is adopted, collected current is reduced by more than three levels, detection current is obtained, the obtained detection current and current on an MOS tube have good correlation linearity, and precision is high. The structure comprises a current acquisition module used for acquiring the current of a to-be-detected MOS tube, and the on-chip MOS tube detection module used for reducing the current acquired by the current acquisition module by more than three levels to obtain detection current.
Description
technical field [0001] The invention relates to the field of integrated circuits, in particular to the field of detecting the magnitude of the power tube current in a switching power supply system. Background technique [0002] When detecting the current of power tubes in structures such as AC-DC converters and DC-DC converters, the following two schemes are usually used in the past: [0003] One is to use the resistance detection scheme, figure 1 It is a traditional current detection method. The current is detected by connecting a resistor Rsense in series with the power tube. The accuracy of this solution usually meets the requirements, but since the current is generally milliampere current, this solution will generate a lot of power consumption. lead to a decrease in system efficiency; [0004] The second is to adopt an inductance detection scheme, which increases the difficulty of design, and the precision of the detection result is low because the inductance value of ...
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Login to View More IPC IPC(8): G01R19/00
CPCG01R19/0092
Inventor沈立陆宇马松蒋乐乐
Owner海安集成电路技术创新中心