Surge suppression circuits, switchgear and set-top boxes

Abstract

The invention provides a surge suppression circuit, a switching device and a set-top box. The surge suppression circuit is connected between a power supply and a load, comprising: a surge suppression module and a steady on-off module. One end of the surge suppression module is connected to the power supply, and another end of the surge suppression module is connected to the load. The surge suppression module is provided with a large input impedance to suppress a peak current and voltage. A control terminal and an input terminal of the steady on-off module are connected to the power supply, and an output terminal of the steady on-off module is connected to the load. The steady on-off module delays a specific time to turn on the power supply and the load, and the specific time corresponds to the time of the surge suppression module to suppress the peak current and voltage. By the surge suppression module, the device is powered on to suppress the power-on peak current and voltage, and the steady on-off module after power-on delays to turn on a load power supply. The delay time corresponds to the time of the suppressed peak current and voltage, so that the load without the impact risk of the peak current and voltage is turned on the power supply for safe and reliable operation.

Description

Technical field [0001] The invention belongs to the field of switching power supplies, and particularly relates to a surge suppression circuit, a switch device and a set-top box. Background technique [0002] Our commonly used electrical equipment often has large current and voltage pulses at the moment of power-on, and these large pulses may damage the components on the circuit, such as DC-DC (direct current to direct current) chips, MOS tubes, ICs (Integrated Circuit) etc. Traditionally, we usually deal with this large pulse by adding one or more capacitors to the input of the power supply for filtering. This processing method is generally effective, but sometimes because the pulse is too large, it has to be increased. Capacitance, and this method of capacitor filtering to solve the problem of excessive pulse does not fundamentally solve it. The large current still exists, but it is absorbed by the capacitor. However, it is not necessarily effective to solve the problem of po...

AI Technical Summary

Problems solved by technology

Traditionally, we usually add one or several capacitors to the input end of the power supply to filter the large pulse. This processing method is generally effective, but sometimes because the pulse is too large, a large capacitor must be added. Capacitor, and this capacitor filtering method solves the problem of excessive pulse and does not solve it fundamentally. The large current still exists, but it is absorbed by the capacitor.

It is not necessarily effective to solve the problem of power-on pulse only with capacitor filtering. Sometimes it is necessary to add a large capacitor, and the package of a large capacitor is generally large, which will inhibit the performance of some circuits that require packaging. design

Images