Cell type power supply device, circuit and electronic equipment
A cell type power supply device includes: a housing having a shape and dimensions based on a cell standard; a cell holder including an inner positive terminal and an inner negative terminal that are brought into contact with front and rear terminals of the external cell held in the housing; an outer positive terminal connected to the inner positive terminal; an outer negative terminal connected to the inner negative terminal; an output transistor interposed between the inner negative terminal and the outer negative terminal or between the inner positive terminal and the outer positive terminal; a control circuit that generates a control signal of the output transistor in accordance with a signal received via an antenna; and a detection resister interposed between the inner negative terminal and the outer negative terminal or between the inner positive terminal and the outer positive terminal in parallel with the output transistor to change a voltage of the outer negative terminal or the outer positive terminal with respect to a reference voltage in accordance with ON/OFF of a power switch.
1. A cell type power supply device attachable alone or in series with an other cell in a cell box of an external load device including a load, the cell box, and a power switch interposed between the load and the cell box, the cell type power supply device comprising:
a housing having a shape and dimensions based on a cell standard;
a cell holder that holds an external cell in the housing, and includes an inner positive terminal and an inner negative terminal that are brought into contact with front and rear terminals of the held external cell;
an outer positive terminal provided on a front end surface of the housing and connected to the inner positive terminal;
an outer negative terminal provided on a rear end surface of the housing and connected to the inner negative terminal;
an output transistor interposed between the inner negative terminal and the outer negative terminal or between the inner positive terminal and the outer positive terminal;
a control circuit that generates a control signal of the output transistor in accordance with an RF signal received from an external information device via an antenna; and
a detection resister interposed between the inner negative terminal and the outer negative terminal or between the inner positive terminal and the outer positive terminal in parallel with the output transistor to change a voltage of the outer negative terminal or the outer positive terminal with respect to a reference voltage in accordance with ON/OFF of the power switch.
2. The cell type power supply device according to claim 1 , wherein the control circuit switches between ON and OFF of a transmitting/receiving operation of an RF signal via the antenna in accordance with ON/OFF of the power switch which is determined based on a voltage level of the outer negative terminal or the outer positive terminal with respect to the reference voltage.
3. The cell type power supply device according to claim 1 , wherein the control circuit changes an interval between communications with the external information device in accordance with ON/OFF of the power switch which is determined based on a voltage level of the outer negative terminal or the outer positive terminal with respect to the reference voltage.
4. The cell type power supply device according to claim 1 , further comprising an internal power supply circuit that generates a designated drive voltage from a cell voltage of the external cell,
wherein the internal power supply circuit starts or stops supplying the drive voltage to the control circuit in accordance with ON/OFF of the power switch which is determined based on a voltage level of the outer negative terminal or the outer positive terminal with respect to the reference voltage.
5. The cell type power supply device according to claim 1 , further comprising:
an internal power supply circuit that generates a designated drive voltage from a cell voltage of the external cell; and
a detection transistor that is interposed between the control circuit and the inner positive terminal or between the internal power supply circuit and the inner positive terminal and is turned on/off in accordance with a voltage level of the outer negative terminal or the outer positive terminal with respect to a reference voltage.
6. The cell type power supply device according to claim 5 , further comprising a logic circuit that receives inputs of the control signal and a detection signal indicating ON/OFF of the detection transistor and outputs to the internal power supply circuit or the control circuit a logic operation result of the control signal and the detection signal.
7. The cell type power supply device according to claim 6 , wherein the control signal is a PWM signal.
8. The cell type power supply device according to claim 6 , wherein a low-pass filter is arranged on an output side of the logic circuit.
9. The cell type power supply device according to claim 1 , further comprising an H bridge control circuit including four transistors to change a direction of a current to be supplied to the load, wherein when the power switch is OFF, one of the four transistors is ON.
10. A cell type power supply device attachable alone or in series with an other cell in a cell box of an external load device including a load, the cell box, and a power switch interposed between the load and the cell box, the cell type power supply device comprising:
a housing having a shape and dimensions based on a cell standard;
a cell holder that holds an external cell in the housing, and includes an inner positive terminal and an inner negative terminal that are brought into contact with front and rear terminals of the held external cell;
an outer positive terminal provided on a front end surface of the housing and connected to the inner positive terminal;
an outer negative terminal provided on a rear end surface of the housing and connected to the inner negative terminal;
an output transistor interposed between the inner negative terminal and the outer negative terminal or between the inner positive terminal and the outer positive terminal;
a control circuit that generates a control signal of the output transistor in accordance with an RF signal received from an external information device via an antenna;
an internal power supply circuit that generates a designated drive voltage from a cell voltage of the external cell; and
a detection resister interposed between the outer negative terminal or the inner positive terminal and the internal power supply circuit to change a voltage of the outer negative terminal or the outer positive terminal with respect to a reference voltage in accordance with ON/OFF of the power switch.
11. The cell type power supply device according to claim 10 , wherein the control circuit switches between ON and OFF of a transmitting/receiving operation of an RF signal via the antenna in accordance with ON/OFF of the power switch which is determined based on a voltage level of the outer negative terminal or the outer positive terminal with respect to the reference voltage.
12. The cell type power supply device according to claim 10 , wherein the control circuit changes an interval between communications with the external information device in accordance with ON/OFF of the power switch which is determined based on a voltage level of the outer negative terminal or the outer positive terminal with respect to the reference voltage.
13. The cell type power supply device according to claim 10 , wherein the internal power supply circuit starts or stops supplying the drive voltage to the control circuit in accordance with ON/OFF of the power switch which is determined based on a voltage level of the outer negative terminal or the outer positive terminal with respect to the reference voltage.