Driving circuit for isolated power supply, isolated power supply circuit and isolated power supply

Abstract

The invention discloses a driving circuit for an isolated power supply, an isolated power supply circuit and an isolated power supply, belonging to the field of integrated circuit design. The drivingcircuit comprises a first NMOS tube, a second NMOS tube and a resonance circuit, wherein the resonance circuit is connected with a signal input end; the grid electrode of the first NMOS transistor andthe grid electrode of the second NMOS transistor are connected with a clock input end, and the first NMOS transistor and the second NMOS transistor are controlled to be alternately opened by a two-phase non-overlapping clock; the drain electrode of the first NMOS transistor and the drain electrode of the second NMOS transistor are respectively connected with the resonance circuit; and the sourceelectrode of the first NMOS transistor and the source electrode of the second NMOS transistor are grounded. According to the isolated power supply provided by the invention, a novel structure is adopted for the driving circuit adopts, and the grid electrode of the MOS tube is controlled by the two-phase non-overlapping clock, so the grid voltage of the MOS tube is reduced, and the isolated power supply can be prepared by adopting a thin gate oxide process; and manufacturing cost is reduced compared with an isolated power supply prepared by adopting a thick gate oxide process, so the isolated power supply is beneficial for production and popularization.

Description

technical field [0001] The present invention relates to the field of integrated circuit design, in particular to a driving circuit for an isolated power supply, an isolated power supply circuit including the driving circuit, an isolated power supply including the isolated power supply circuit, and a corresponding isolation system. Background technique [0002] In the fields of motor drive, industrial control, IGBT driver, communication bus, and data acquisition module, isolated power supplies with low power and low power consumption are often used. This type of isolated power supply requires high volume and integration. Currently commonly used low-power and low-power isolated power supplies are generally implemented using an NMOS cross-coupled oscillation structure. This structure uses self-resonance to achieve a soft switching state with high efficiency. [0003] However, the gate voltage of the NMOS transistor in this structure is the oscillation amplitude of the cross-cou...

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Problems solved by technology

[0003] However, the gate voltage of the NMOS transistor in this structure is the oscillation amplitude of the cross-coupled structure, such as figure 1 As shown in the dotted line in the circuit diagram shown, this requires the MOS transistor to have a high gate-source breakdown voltage, which is generally realized by a thick gate oxide process, which will increase the production cost and is not conducive to production and promotion

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