Wide-load range, high-precision and low-power consumption current detection circuit
A current detection circuit, high-precision technology, applied in the direction of measuring current/voltage, measuring devices, measuring electrical variables, etc., can solve the problems that the current detection circuit cannot guarantee the normal operation of a wide load range and the impact of detection accuracy
Inactive Publication Date: 2013-05-08
SOUTHEAST UNIV
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Problems solved by technology
[0012] In the traditional current detection circuit formula (1) and formula (2), the bias current I must be subtracted due to the induced current 1 However, the nonlinear error is introduced, so that the final detection accuracy is affected, and this nonlinear error will become more obvious under the requirement of low power consumption; in addition, the traditional current detection circuit cannot guarantee normal operation in a wide load range under the premise of low power consumption. Work
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[0029]Below in conjunction with accompanying drawing, the technical scheme realization method of invention is described:
[0030] Due to the induced current, the traditional current detection circuit needs to subtract the bias current I 1 However, nonlinear errors are introduced, which reduces the detection accuracy. image 3 The current sensing circuit invented in can eliminate the non-linear error. image 3 The circuit in the conventional current sense circuit figure 2 5 MOS tubes (M6-M10) are added on the basis of M6 and M1-M3 together form a row of current mirrors, mirroring the currents in M1, M2, and M3. When the width-to-length ratio of M6 is equal to M1-M3, the currents flowing through the four MOS tubes are equal. In this circuit, the current flowing through M6 is equal to the bias current I 1 . M9 and M10 have the same width-to-length ratio and are a pair of current mirrors, and the currents flowing through the two MOS tubes are also equal. M7 and M8 have the ...
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The invention discloses a wide-load range, high-precision and low-power consumption current detection circuit. The current detection circuit comprises a cascade current mirror, a power stage output circuit, a detection circuit and a switching circuit and also comprises five metal-oxide semiconductor (MOS) transistors M6 to M10, wherein the cascade current mirror consists of M2 to M5; the power stage output circuit consists of MN1, L and C; the detection circuit consists of MP1 and MP2; and the switching circuit consists of MS1 and MS2. By using the current detection circuit, a nonlinear errorcaused by a bias current is eliminated on the basis of properly increasing circuit complexity and ensuing low power consumption, so that the detection precision is improved on the premise of low power consumption of an improved current detection circuit; therefore, the aim of improving the performance of an overall direct current-direct current (DC-DC) system is fulfilled.
Description
technical field [0001] The invention relates to a wide load range, high precision and low power consumption current detection circuit applied to step-down DC-DC, and belongs to the technical field of power level analog integrated circuits. Background technique [0002] Power management chips are an indispensable part of modern electronic products, and they are particularly prominent as people's requirements for the standby time of electronic products increase. Therefore, the design of high-efficiency and high-performance power management chips is full of challenges, and for power management design Improvements in technology are significant. [0003] DC-DC is the most commonly used in power management chips. Most of the existing step-down DC-DC adopts the peak current mode of voltage and current double-loop control. Therefore, the current detection circuit as the core of the current loop is particularly important. The stability of the system has a great influence. At the sam...
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IPC IPC(8): G01R19/00
Inventor 吴金龙寅鞠刘洪苏丹
Owner SOUTHEAST UNIV