| US 7,551,418 B2 | ||
| Device for preventing internal combustion of equipment from spreading outwards | ||
| Haosi Ran, Shenzhen (China); Jianlin Zhou, Shenzhen (China); Sheng Jin, Shenzhen (China); and Songping Wang, Shenzhen (China) | ||
| Assigned to Huawei Technologies Co., Ltd., Shenzhen (China) | ||
| Filed on Mar. 20, 2008, as Appl. No. 12/52,560. | ||
| Application 12/052560 is a continuation of application No. PCT/CN2006/001348, filed on Jun. 15, 2006. | ||
| Claims priority of application No. 2005 1 0037533 (CN), filed on Sep. 22, 2005. | ||
| Prior Publication US 2008/0204960 A1, Aug. 28, 2008 | ||
| Int. Cl. H02H 5/00 (2006.01); H02H 5/04 (2006.01) | ||
| U.S. Cl. 361—103 [361/104; 361/106] | 19 Claims |
| 1. A device for preventing internal combustion of equipment from spreading outwards, comprising a sampling circuit, a detecting
and monitoring circuit connected to the sampling circuit and a low-voltage datum power supply; wherein
the output of the low-voltage datum power supply is connected to the ground via the sampling circuit to form a loop circuit;
the sampling circuit comprises at least two thermal detectors, the detecting and monitoring circuit comprises a first monitoring
output end (out1) and a second monitoring output end (out2), the detecting and monitoring circuit monitors the output of the first monitoring output end (out1) and the second monitoring output end (out2) according to the working status of the thermal detectors as follows:
the first monitoring output (Vout1) is inactive and the second monitoring output (Vout2) is inactive when the at least two thermal detectors are in normal status;
the first monitoring output (Vout1) is inactive and the second monitoring output (Vout2) is active when some of the at least two thermal detectors are in abnormal status;
the first monitoring output (Vout1) is active and the second monitoring output (Vout2) is active when the at least two thermal detectors are all in abnormal status;
the first monitoring output (Vout1) is configured to turn off a power supply, and the second monitoring output (Vout2) is configured to drive an alarm unit without affecting the power supply.
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