Standby mode control method and control system

Abstract

The present invention discloses a standby mode control method and a control system. The control method includes: S1, judging whether the load is stable in the light load state according to the switching action of the DC / DC chip; S2, when the load is stable in the light load state, According to the working time and interval time of the switching action of the DC / DC chip, determine whether the load is in an extremely light load state; S3, when the load is in an extremely light load state, control the DC / DC chip to enter the standby mode. The circuit structure of the present invention is simple, no need to add an analog circuit; the standby mode does not frequently enter and exit, and the circuit does not need to be frequently turned off and started, which can effectively improve the work reliability; the standby mode does not misjudge, and can ensure that the standby mode is only entered under extremely light load. .

Description

technical field [0001] The invention belongs to the technical field of power chip control, and in particular relates to a standby mode control method and a control system. Background technique [0002] When the DC / DC chip is lightly loaded, such as <200mA, in order to improve the conversion efficiency, the DC / DC chip usually works in the PSM (pulse-skip mode) mode, that is, intermittent operation: after a group of switching actions, it will pause for a period of time. The smaller the load current, the longer the interval between each group of switches. [0003] When the DC / DC chip is extremely lightly loaded, such as <10mA, in order to further improve the conversion efficiency, it is necessary to turn off the circuit inside the DC / DC chip that does not affect the operation of the PSM, and reduce the quiescent current of the DC / DC chip, that is, the standby mode (standby mode) . [0004] ginseng figure 1 Shown is the circuit schematic diagram of the DC / DC chip in the...

AI Technical Summary

Problems solved by technology

In certain load current ranges, see Figure 4 shown, t stop very close to T A , the internal circuit is only closed for a short time, so that the circuit will be closed and started frequently, which is prone to abnormal behavior and affects the reliability of work

When the additional design enables the circuit to quickly return to the normal operating point, the chip area is consumed and the cost is greatly increased;

[0008] easy to misjudge, see Figure 5 As shown, in the process of jumping from heavy load to light load, the output voltage will overshoot, and there will also be a long interval, thus entering the standby mode, but the actual load current is not so small as to be extremely light load. need to enter standby mode

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