초록 ▼

A protection element (10) protects a battery pack (36) from potential faulty conditions in a load (38). The protection element (10) includes a switch (12), a control FET (14), and three resistors (16, 18, and 22). Under normal operating conditions, the switch (12) is conductive and the control FET (

A protection element (10) protects a battery pack (36) from potential faulty conditions in a load (38). The protection element (10) includes a switch (12), a control FET (14), and three resistors (16, 18, and 22). Under normal operating conditions, the switch (12) is conductive and the control FET (14) is non-conductive. If a short circuit is detected, the controller (14) becomes conductive and turns off the switch (12). The switch (12) remains non-conductive until the load (38) is disconnected from the protection element (10). The protection element (10) further includes a temperature sensor (24) that turns off the switch (12) at high temperatures and a current limiting element (28) that imposes an upper limit on the current flowing through the protection element (10). Control signals can be applied to the gate electrodes of the switch (12) and the control FET (14) to modulate the current in the protection element (10).

대표청구항 ▼

A protection element for protecting a battery pack having a first battery terminal and a second battery terminal from a faulty condition in a load having a first load terminal and a second load terminal, comprising a first switch, wherein the first switch includes: a first transistor having a contro

A protection element for protecting a battery pack having a first battery terminal and a second battery terminal from a faulty condition in a load having a first load terminal and a second load terminal, comprising a first switch, wherein the first switch includes: a first transistor having a control electrode, a first current conducting electrode for coupling to the first battery terminal, and a second current conducting electrode for coupling to the first load terminal; a second transistor having a control electrode, a first current conducting electrode coupled to the first current conducting electrode of the first transistor, and a second current conducting electrode coupled to the control electrode of the first transistor; a first resistor having a first electrode for coupling to the second battery terminal and to the second load terminal, and a second electrode coupled to the control electrode of the first transistor; a second resistor having a first electrode coupled to the second current conducting electrode of the first transistor and a second electrode coupled to the first current conducting electrode of the second transistor; and a third resistor having a first electrode coupled to the first electrode of the second resistor and a second electrode coupled to the control electrode of the second transistor.