Switching circuit, chip and electronic equipment

By designing charge and discharge modules, discharge modules, inverse current detection modules and logic modules in the switching circuit, the ringing phenomenon of the switching circuit in standby or sleep states is solved, and the effect of reducing electromagnetic interference and device damage is achieved.

CN119727312APending Publication Date: 2025-03-28SHANGHAI AWINIC TECH CO LTD
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Patent Information

Application Number
CN202411899113.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

When the switch circuit is in standby or sleep state, entering the discontinuous conduction mode may cause resonance between the inductor and the parasitic capacitance of the main switch, causing ringing, serious electromagnetic interference and device damage.

Method used

A switching circuit is designed, including a charge and discharge module, a discharge module, a reverse current detection module and a logic module. The charge and discharge module switches the charging and discharge cycles under the control of the control signal. The inverse current detection module detects the inverse current of the load unit to the energy storage unit and outputs a signal. The logic module controls the on and off of the discharge module according to the control signal and the inverse current detection signal to absorb the electrical energy after the discharge of the energy storage unit is discharged.

Benefits of technology

It effectively avoids ringing in the switching circuit, reduces electromagnetic interference, reduces the risk of device damage, and reduces the number of devices and power consumption of the switching circuit.

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Abstract

The invention relates to the technical field of integrated circuits, and discloses a switching circuit comprising a charging and discharging module which comprises an energy storage unit and a load unit, the first end of the energy storage unit is connected with an input signal, and the second end of the energy storage unit is connected with the first end of the load unit; the discharge module is connected in parallel with the energy storage unit, and the discharge module can absorb electric energy flowing to the energy storage element from a parasitic capacitor in the switching circuit in a conducting state; the reverse current detection module is connected with the second end of the energy storage unit and is used for detecting reverse current flowing to the energy storage unit from the load unit and outputting a first signal according to the state of the reverse current; and the logic module is connected with the output ends of the charging and discharging module and the reverse current detection module and the input end of the discharge module, and is used for performing logic operation on the at least one control signal and the first signal and controlling the on-off of the discharge module based on the result of the logic operation. According to the switching circuit, the ringing phenomenon of the switching circuit can be avoided.
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