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Novel floating voltage detection circuit

A technology of floating voltage and detection circuit, which is applied in the direction of electrical components, adjusting electric variables, instruments, etc., can solve the problems of rough sampling circuit, bad influence of circuit design, inability to accurately sample floating voltage, etc., and achieve the effect of easy integration and simple structure

Pending Publication Date: 2019-04-12
58TH RES INST OF CETC
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Problems solved by technology

[0004] The purpose of the present invention is to provide a new type of floating voltage detection circuit to solve the problem that the existing sampling circuit is relatively rough and cannot accurately sample the floating voltage, thus easily causing adverse effects in circuit design

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Embodiment 1

[0018] The present invention provides a novel floating voltage detection circuit, the structure of which is as follows figure 1 shown. The novel floating voltage detection circuit includes a detection current generation circuit 1, a detection voltage compensation circuit 2 and a detection resistor R3. The output ends of the detection current generation circuit 1 and the detection voltage compensation circuit 2 are both connected to the source of the protection voltage PMOS transistor, and one end of the detection resistor R3 is connected to the drain end of the protection voltage PMOS transistor.

[0019] Specifically, the detection current generation circuit 1 includes a PMOS transistor PM1, a PMOS transistor PM2, and a resistor R1; wherein, the source of the PMOS transistor PM1 is connected to the high-end voltage V of the voltage to be detected H connected, the gate is connected to the gate and drain of the PMOS transistor PM2 and one end of the resistor R1, and the drain ...

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Abstract

The invention discloses a novel floating voltage detection circuit, and belongs to the technical field of an integrated circuit. The novel floating voltage detection circuit comprises a detection current generation circuit, a detection voltage compensation circuit and a detection resistor R3, wherein output ends of the detection current generation circuit and the detection voltage compensation circuit both are connected to a source of a protection voltage-resistant MOS tube, and one end of the detection resistor R3 is connected to a drain end of the protection voltage-resistant MOS tube. Compared with a traditional structure, the deviation of a traditional detection circuit generated by changes of a chip temperature and a process is compensated by an additionally-arranged detection voltagecompensation circuit; and moreover, the novel floating voltage detection circuit is simple in structure and is easy to integrate in a chip design such as SOC.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a novel floating voltage detection circuit. Background technique [0002] In the current DCDC power supply and many systems, in order to meet the higher application voltage, it is necessary to drive higher-voltage devices, but in order to reduce the cost of the production process, low-voltage devices are often used in floating voltage rails, which can not only Ensure that the chip area is smaller and compatible with more processes. [0003] The reference voltage is often the reference voltage relative to the ground potential. If you want to sample the magnitude of the floating voltage difference, you must convert the floating voltage sampling into a sampling voltage to the ground to ensure that it is convenient for comparison or other purposes. However, the traditional sampling circuit is relatively rough and cannot accurately sample the voltage, thus causing unpredi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M1/32
CPCH02M1/32H02M3/158
Inventor 阮建新肖培磊罗永波宣志斌
Owner 58TH RES INST OF CETC
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