Power supply device
A microcomputer and a detection circuit in a low power consumption mode is restarted easily and stably. A power supply device includes a battery module ( 10 ) including battery cells ( 1 ), a battery connection circuit ( 2 ) configured to detect battery information of the battery module ( 10 ) and configured to be switched to a low power consumption mode, an activation circuit ( 3 ) configured to switch the battery connection circuit ( 2 ) from the low power consumption mode to an operation mode, and an activation switch ( 4 ) configured to output a switching signal to the activation circuit ( 3 ). The battery connection circuit ( 2 ) includes a detection circuit ( 21 ) configured to detect the battery information and a microcomputer ( 22 ) configured to process the battery information detected by the detection circuit ( 21 ). The activation circuit ( 3 ) includes a first switching circuit ( 6 A) configured to output a first activation pulse to the detection circuit ( 21 ) in response to the switching signal input from the activation switch ( 4 ), and a second switching circuit ( 6 B) configured to output a second activation pulse having a larger pulse width than the first activation pulse to the microcomputer ( 22 ) in response to the switching signal input from the activation switch ( 4 ).
1 . A power supply device comprising:
a battery module including chargeable battery cells;
a battery connection circuit connected to the battery module, the battery connection circuit being configured to detect battery information, the battery connection circuit being switchable to a low power consumption mode;
an activation circuit configured to output an activation pulse switching the battery connection circuit from the low power consumption mode to an operation mode; and
an activation switch configured to output a switching signal to the activation circuit, wherein
the battery connection circuit includes:
a detection circuit configured to detect the battery information of the battery module; and
a microcomputer configured to process the battery information detected by the detection circuit, and
the activation circuit includes:
a first switching circuit configured to output a first activation pulse to the detection circuit in response to the switching signal input from the activation switch; and
a second switching circuit configured to output a second activation pulse having a larger pulse width than the first activation pulse to the microcomputer in response to the switching signal input from the activation switch.
2 . The power supply device according to claim 1 , wherein
the detection circuit includes a first input terminal configured to have the first activation pulse input thereto,
the microcomputer includes a second input terminal configured to have the second activation pulse input thereto,
the detection circuit is configured to supply a power supply voltage to the microcomputer to set the microcomputer to a polling state upon detecting the first activation pulse, and
the microcomputer in the polling state is configured to detect the second activation pulse and determine switching from the low power consumption mode to the operation mode.
3 . The power supply device according to claim 1 , wherein
the activation circuit includes:
an input circuit configured to output a High signal while the activation switch is turned on; and
an output circuit connected to an output side of the input circuit, and the output circuit includes:
a first switching circuit configured to output the first activation pulse; and
a second switching circuit configured to output the second activation pulse.
4 . The power supply device according to claim 3 , wherein
the detection circuit includes a first input terminal configured to have the first activation pulse input thereto,
the microcomputer includes a second input terminal configured to have the second activation pulse input thereto,
the first switching circuit includes a first FET configured to output the High signal from the input circuit to the first input terminal of the detection circuit,
the second switching circuit includes a second FET configured to output the High signal from the input circuit to the second input terminal of the microcomputer, and
a parallel circuit of a capacitor and a resistor is connected between a ground line and an output side of the second FET.
5 . The power supply device according to claim 4 , wherein
the first switching circuit includes a first FET configured to output the High signal from the input circuit to the first input terminal of the detection circuit,
the second switching circuit includes a second FET configured to output the High signal from the input circuit to the second input terminal of the microcomputer,
the first FET is configured to be powered by a voltage of the battery module, and
the first FET includes a coupling capacitor connected in series with a gate of the first FET.
6 . The power supply device according to claim 5 , further comprising a diode connected in series to a gate of the second FET.
7 . The power supply device according to claim 5 , wherein the detection circuit includes a low voltage power supply configured to step down the voltage of the battery module and supply a power supply voltage to the second FET.
8 . The power supply device according to claim 7 , wherein the detection circuit is configured to, upon detecting the first activation pulse, set the low voltage power supply to the operation mode and supply the power supply voltage to the second FET.
9 . The power supply device according to claim 7 , wherein
an output voltage of the battery module is 30 V or more, and
an output voltage of the low voltage power supply is 5 V or less.
10 . The power supply device according to claim 5 , wherein the detection circuit includes a microcomputer power supply configured to step down a voltage of the battery module and supply a power supply voltage to the microcomputer.
11 . The power supply device according to claim 10 , wherein the detection circuit is configured to, upon detecting the first activation pulse, set the microcomputer power supply to the operation mode, and supply the power supply voltage to the microcomputer.
12 . The power supply device according to claim 10 , wherein
the detection circuit includes a low voltage power supply configured to step down the voltage of the battery module and supply a power supply voltage to the second FET, and
the microcomputer power supply together with the low voltage power supply is configured to supply the power supply voltage to the microcomputer and the second FET.
13 . The power supply device according to claim 12 , wherein
an output voltage of the battery module is 30 V or more, and
an output voltage of the low voltage power supply is 5 V or less.
14 . The power supply device according to claim 10 , wherein
an output voltage of the battery module is 30 V or more, and
an output voltage of the microcomputer power supply is 5 V or less.
15 . The power supply device according to claim 1 , wherein the detection circuit includes a microcomputer power supply configured to step down a voltage of the battery module and supply a power supply voltage to the microcomputer.
16 . The power supply device according to claim 15 , wherein the detection circuit is configured to, upon detecting the first activation pulse, set the microcomputer power supply to the operation mode, and supply the power supply voltage to the microcomputer.
17 . The power supply device according to claim 15 , wherein
an output voltage of the battery module is 30 V or more, and
an output voltage of the microcomputer power supply is 5 V or less.
18 . The power supply device according to claim 1 , wherein the activation switch is a push-button switch configured to output an on signal upon being pressed.