A current detection circuit
A current detection circuit and current detection technology, applied in the direction of measuring current/voltage, components of electrical measuring instruments, measuring electricity, etc., to achieve the effect of increasing gain, enhancing response speed, and flexible design
Active Publication Date: 2021-11-19
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0004] Aiming at the defects of the prior art, the object of the present invention is to provide a current detection circuit, aiming at overcoming the problem that the existing current detection circuit is difficult to accurately and quickly detect the load current within a wide power supply voltage range
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[0023] In order to make the object, technical solution and effect of the present invention more understandable, the implementation of the present invention will be further described below in conjunction with the accompanying drawings. The details described below are only for a sufficient understanding of the present invention, but the present invention is not limited to the specific examples disclosed below.
[0024] figure 2 It is a schematic structural diagram of the current detection circuit 200 proposed by the present invention, including a load current sampling circuit 204 , a bias voltage generation circuit 205 , an amplifier circuit 206 , a detection current generation circuit 207 , and a maximum load indication circuit 208 .
[0025] Specifically, through the closed-loop negative feedback structure formed by the load current sampling circuit 204, the amplifier circuit 206, and the detection current generation circuit 207, the reverse input signal 209 of the amplifier ...
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The invention discloses a current detection circuit, which belongs to the technical field of analog integrated circuits. Including load current sampling circuit, bias voltage generating circuit, amplifier, detection current generating circuit and maximum load indicating circuit; the power input terminal of the load current sampling circuit is connected to VCC, the signal input terminal is connected to Vg, and the feedback input terminal is reversed to the differential input of the amplifier Terminal, the feedback output signal of the detection current generating circuit is connected, the output terminal is connected to the forward terminal of the differential input of the amplifier; the input terminal of the bias voltage generating circuit is connected to VDD, the output terminal is connected to the bias input terminal of the amplifier and the bias input of the maximum load indicating circuit terminal; the output terminal of the amplifier is connected to the input terminal of the detection current generating circuit and the input terminal of the maximum load indicating circuit; the maximum load indicating circuit can limit the maximum value of the detection output signal; the signal output terminal of the detection current generating circuit transmits the detection signal. The invention can detect the load current in the range of 8V-36V power supply, and has the advantages of fast detection speed, high detection precision and the like.
Description
technical field [0001] The invention relates to the technical field of analog integrated circuits, in particular to a current detection circuit. Background technique [0002] For chips such as high-side driver chips or switching power supplies, it is often necessary to detect changes in load current. With the rapid development of power management systems, the power supply voltage range of circuit modules or chips is getting wider and wider. For conventional current detection, it is difficult to accurately and quickly detect the load current in a large power supply voltage range. Therefore, there is a need for a current sensing circuit that can accurately and quickly detect changes in load current over a wide range of high supply voltage conditions. [0003] figure 1 Shown is a common current detection circuit, including: an operational amplifier, PMOS transistor P1, NMOS transistors N1 and N2, resistor R1, and a load circuit. The N2 tube and the N1 tube are NMOS transisto...
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IPC IPC(8): G01R19/165G01R1/30
CPCG01R1/30G01R19/16523G01R19/16533
Inventor 俞阳刚邹志革邹雪城皮庆广谢锦红李君瑞吕骏夫
Owner HUAZHONG UNIV OF SCI & TECH