Bidirectional frequency synchronous oscillator circuit

Abstract

The invention discloses a bidirectional frequency synchronous oscillator circuit. The circuit comprises an oscillator main body module, a synchronous clock signal generation module, an external clocksignal detection module and an internal and external clock signal mutual interference prevention module; the oscillator main body module is connected with an external resistor to control triangular wave signals generated by periodic charging and discharging of an external capacitor, and the oscillator main body module internally comprises a charging and discharging circuit of the external capacitor and related control circuits; when no clock signal exists outside, the synchronous clock signal generation module outputs the clock signal generated by the oscillator main body module, and the clocksignal can be used as a clock signal of other power supply systems; the external clock signal detection module is used for detecting whether an external clock signal exists or not, and controlling the oscillator main body module to synchronize to the external clock signal when the external clock signal is detected; the internal and external clock signal mutual interference prevention module is used for avoiding mutual interference between an external clock signal and an internally generated clock signal, so the external clock signal and the internally generated clock signal cannot appear at the same time, and logic errors are avoided.

Description

technical field [0001] The invention belongs to the technical field of power management, and in particular relates to a bidirectional frequency synchronous oscillator circuit. Background technique [0002] Switching power supply is widely used in the power supply system of various electronic products due to its light weight, high efficiency and other excellent performance. The clock generation circuit is an important module of the switching power supply control system, and the frequency of the clock signal generated by it determines the switching frequency of the switching power supply system. Usually, an electronic product contains multiple switching power supply modules, and these power supply modules work at different switching frequencies, so electromagnetic interference and switching noise will cause strong interference to the circuit. The impact is particularly serious when multiple switching power supplies are connected in parallel or in series. The switching freque...

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Problems solved by technology

[0003]Aiming at the above-mentioned traditional switching power supply in which the oscillator frequency is fixed, it cannot provide clocks for other circuits, and the problems of stability, complexity and For the shortcomings of the same frequency to high frequency circuits, the present invention proposes a two-way frequency synchronous oscillator circuit, which can be synchronized to external high frequency and low frequency clock signals, and can also provide clock synchronization signals for other circuits, realizing two-way frequency synchronization , can be widely used in various frequency synchronous switching power supply systems

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