Semiconductor device
AssigneeRenesas Electronics Corporation
InventorsKohei KAWANO, Tsuyoshi OTA
Life of this patent
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Abstract
A semiconductor device capable of turning a discharge control transistor off faster while maintaining safety is provided. A control unit, in discharge stopping processing, turns a switching element on and executes a first discharge-stopping mode in which the gate voltage of the discharge control transistor is withdrawn via a load and, at a predetermined discharge-stopping mode switching timing, switches to a second discharge-stopping mode in which the gate voltage of the discharge control transistor is withdrawn directly to a low-voltage power source.
Claims14
A semiconductor device for controlling charging and discharging of a battery cell included in a battery pack, the semiconductor device comprising:
- a boost circuit with an input end coupled via a first node to a positive-side end of the battery pack and an output end coupled via a second node to a gate of a discharge control transistor;
- a switching element with one end coupled to the first node and another end coupled to the second node;
- a first switching element for voltage withdrawal with one end coupled to the first node and another end coupled to a low-voltage power source;
- wherein the first node is coupled to a source of the discharge control transistor and a positive-side end of the battery cell is coupled to a drain of the discharge control transistor.
A semiconductor device for controlling charging and discharging of a battery cell included in a battery pack, the semiconductor device comprising:
- a boost circuit with an input end coupled via a first node to a positive-side end of the battery pack and an output end coupled via a second node to a gate of a discharge control transistor;
- wherein the first node is coupled to a source of the discharge control transistor and a positive-side end of the battery cell is coupled to a drain of the discharge control transistor
- and
- wherein, in discharge stopping processing, the semiconductor device short-circuits the first node and the second node and withdraws the gate voltage directly to a low-voltage power source.
A battery pack comprising:
- a battery cell;
- a discharge control transistor;
- a boost circuit with an input end coupled to a positive-side end of the battery pack and an output end coupled to the gate of the discharge control transistor;
- wherein the input end is coupled to a source of the discharge control transistor and a positive-side end of the battery cell is coupled to a drain of the discharge control transistor
- and wherein, in discharge stopping processing, the battery pack short-circuits the first node and the second node and withdraws the gate voltage directly to a low-voltage power source.
Dependencies are inferred from the claim text.