Control circuits and interactive power supplies containing control circuits

Abstract

The invention provides a control circuit for controlling an interactive power supply which has less influence on component deviation and is suitable for mass production, and an interactive power supply including the control circuit. A clock pulse of a predetermined frequency is generated by the clock generator. Through the signal multiplying unit, based on the main drive pulse signal and the clock pulse for switching and driving the main switch of the main converter, the main switch conduction width pulse signal is generated, and the duty ratio of the main switch conduction width pulse signal is: Twice the double duty pulse signal is generated. The edge pulse generation unit generates a first edge pulse signal based on the main drive pulse signal, and generates a second edge pulse signal based on the double duty pulse signal. A slave drive pulse signal for making the on-time width of the master switch equal to the on-time width of the slave switch is generated based on the first edge pulse signal and the second edge pulse signal by the slave drive pulse signal generator.

Description

technical field [0001] The invention relates to a control circuit for controlling an interleave power supply which has less influence on component deviation and is suitable for mass production, and an interleave power supply including the control circuit. [0002] this application claims priority based on Japanese Patent Application No. 2011-252579 for which it applied to Japan on November 18, 2011, and uses the content here. Background technique [0003] As a conventional interactive switching (switching) power supply, there is the patent document 1 figure 1 The disclosed interactive switching power supply. In this conventional alternating switching power supply, for example, two critical step-up chopping converters (converters) include switching on and off switching elements provided between the other end of the transformer (transformer) and ground. The control circuit for controlling, the control circuit of the first critical type boost chopper converter generates the s...

AI Technical Summary

Problems solved by technology

[0006] However, when using a control circuit that does not have a close relationship between the voltage of the FB terminal (VFB) and the on-time width (TON) of the switching element Q31, the first critical type step-up chopper converter and the second critical type In a step-up chopper converter, the on-time widths of the respective switch currents become unbalanced

As a result, the current critical action of the second critical step-up chopper converter can no longer be maintained, the power factor decreases, the output voltage fluctuation increases, the noise increases, and even the noise of the choke coil may increase

Therefore, in the above-mentioned conventional alternating switching power supply, since the conduction time widths of the switching currents of the first critical step-up chopper converter and the second critical step-up chopper converter cannot be automatically adjusted to be consistent , so screening may be required in mass production

Therefore, especially when it is a multi-stage current critical type alternating switching power supply using more than two critical type step-up chopper converters, there is a problem of difficulty in mass production

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