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Current detection circuit

A technology of current detection circuit and current detection resistor, which is applied in the direction of measuring current/voltage, only measuring current, measuring devices, etc., and can solve the problem of reducing the voltage value of the input terminal of the comparator

Inactive Publication Date: 2021-07-16
海安集成电路技术创新中心 +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0011] Using the same analysis method, we can find that the output still satisfies In this way, the effective current detection is also realized, and the same voltage difference amplification reduces the voltage value at the input terminal of the comparator

Method used

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Embodiment Construction

[0016] . figure 1 It is a typical current detection circuit, wherein, resistor R2=R3, resistor R4=R5. The current passes through the detection resistor R1, and a voltage difference ΔV is generated between the upper end of the resistor R4 and the upper end of the resistor R5. For an ideal op amp, the positive and negative inputs have approximately the same potential. Therefore, the current difference flowing through the resistors R1 and R2 is ΔI=ΔV / R11. This current difference will completely act on the resistors R4 and R5. Considering that the potentials at one end of the resistors R4 and R5 are the same, the voltage difference at the other end is: Because the other end of the resistor R4 is grounded. That is, the voltage is 0V, then under stable conditions, the other end of the resistor R5, that is, the output potential of the op amp is ΔV out ;

[0017] Thus ΔV out The magnitude of reflects the magnitude of the current flowing through the resistor R1 terminal, or the m...

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Abstract

The invention discloses a novel current detection circuit which is characterized in that two resistors are connected in parallel at two ends of a divider resistor in a comparator compared with a traditional current detection circuit. By adopting the method, the voltage of the input end of the comparator can be reduced in a large range. The method is suitable for low-voltage current detection and low-voltage current detection. The circuit structure is not only suitable for a circuit formed by separated elements, but also suitable for current detection in a chip. For a chip with a low-voltage process, the current in a high-voltage circuit can be detected by adopting the technology.

Description

technical field [0001] The invention relates to the field of integrated circuits and power electronics, especially to high-voltage current detection circuits Background technique [0002] Current detection is necessary for most electronic systems. Nowadays, electronic systems are more and more widely used, and current detection circuits face more and more environments. Integrated circuits using high-voltage technology can perform current detection on high-voltage branches. However, integrated circuits of traditional technology can only use resistance voltage division, but there is also a problem, that is, when the voltage division resistance is too small, the gain of the detection circuit will be very small, which will directly affect the function of the current detection circuit. If the resistance is too large, it will make the integrated operational amplifier bear higher voltage and directly affect the reliability. The invention adopts the way of additional parallel resis...

Claims

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Application Information

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IPC IPC(8): G01R19/00
CPCG01R19/0092
Inventor 陆宇马松蒋乐乐沈立
Owner 海安集成电路技术创新中心
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