Constant conduction time type boosting voltage stabilizer

Abstract

The invention provides a constant conduction time type boosting voltage stabilizer. The constant conduction time type boosting voltage stabilizer comprises an output circuit, a voltage feedback circuit, a voltage feedback compensation circuit, a ripple generation circuit, a signal addition and subtraction circuit, an output voltage control circuit, a self-adaptive conduction time trigger circuit, a self-adaptive conduction time production circuit, a frequency locking circuit and a driving output circuit. The voltage feedback circuit is used for sampling output voltage to obtain feedback voltage. The voltage feedback compensation circuit is used for sampling output voltage to obtain feedback compensation voltage; a ripple production circuit is used for sampling inductive current in the output circuit to generate ripple voltage; the signal addition and subtraction circuit is used for using the feedback voltage to add the ripple voltage and to subtract the feedback compensation voltage to obtain a feedback resultant signal; the output voltage control circuit obtains a trigger enabled signal on the basis of the feedback resultant signal; the self-adaptive conduction time trigger circuit obtains the conductive trigger signal on the basis of the trigger enabled signal; the self-adaptive conduction time generation circuit and the frequency locking circuit are used for obtaining a quasi-fixed conduction time on the basis of the conduction trigger signal; and the driving output circuit generates a driving signal according to the quasi-fixed conduction time in order to drive the output circuit. The constant conduction time type boosting voltage stabilizer solves problem that a load end needs to use a electrolytic capacitor of a large parasitic resistor.

Description

【Technical field】 [0001] The invention relates to the field of voltage regulation, in particular to a constant conduction time boost voltage regulator. 【Background technique】 [0002] Boost (Boost) regulators are widely used in various consumer handheld devices and portable electronic products, which can convert the voltage of a single ordinary battery (NiCd, NiMH or dry battery, etc.) to a higher voltage required by the system . At present, most of these Boost regulators use current mode control. Although the current mode technology is relatively mature, it requires slope compensation, and the poor design of the compensation circuit will not only affect the stability of the system but also affect the working efficiency of the system. In recent years, Boost regulators with a constant on-time COT architecture have been widely adopted. [0003] figure 1 It is a structural block diagram of a traditional COT type BOOST regulator. Such as figure 1 As shown, the BOOST regula...

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Problems solved by technology

[0005] The present invention proposes a novel COT type BOOST voltage regulator, which can solve the problem of large frequency variation range and load capacitance requiring large parasitic resistance

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