Surge protection device and telecommunication equipment comprising the same
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorJianping Zheng
Life of this patent
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Abstract
The present disclosure provides a surge protection device comprising a surge arrestor and an arrestor assistor. The surge arrestor is arranged within a circuit branch connected in parallel with a load and adapted to clamp a load voltage to a clamping voltage not larger than a load voltage limit when the load voltage rises to a breakdown voltage of the surge arrestor, the breakdown voltage increasing with a rising rate of the load voltage. The arrestor assistor is connected in parallel with the surge arrestor within the circuit branch and adapted to make the load voltage rise to the breakdown voltage not larger than the load voltage limit. The present disclosure also provides a telecommunication equipment comprising the surge protection device.
Claims10
A surge protection device, comprising:
- a surge arrestor,
- arranged within a circuit branch connected in parallel with a load, and
- adapted to clamp a load voltage (Vload) to a clamping voltage (Vclamp) not larger than a load voltage limit (Vlimit) when the load voltage (Vload) rises to a breakdown voltage (VA1TH) of the surge arrestor, the breakdown voltage (VA1TH) increasing with a rising rate of the load voltage (Vload);
- and
- an arrestor assistor,
- connected in parallel with the surge arrestor within the circuit branch, and
- adapted to allow the load voltage (Vload) to rise to the breakdown voltage (VA1TH) not larger than the load voltage limit (Vlimit),
- the arrestor assistor comprising:
- a transient voltage suppressor (TVS) diode having a clamping voltage (VCTVS) not larger than the load voltage limit (Vlimit) and a reverse breakdown voltage (VBRTVS) less than the clamping voltage (VCTVS), wherein the TVS diode prevents the load voltage (Vload) from exceeding the clamping voltage (VCTVS) and thus suppresses the rising rate of the load voltage (Vload) when the load voltage (Vload) rises to the reverse breakdown voltage (VBRTVS);
- and
- a semiconductor switch connected in series with the TVS diode, wherein the semiconductor switch is turned off when the load voltage (Vload) rises to the breakdown voltage (VA1TH) of the surge arrestor and is turned on when the load voltage (Vload) drops to a normal operation voltage (VNORMAL) not larger than the clamping voltage (Vclamp).
Dependencies are inferred from the claim text.