POWER MANAGEMENT CIRCUIT AND ELECTRONIC DEVICE USING THE SAME
First Claim
1. An electronic device, comprising:
- a first rechargeable battery;
a solar cell mounted on the electronic device and configured for receiving ambient light beams and transform received light beams into DC voltage;
a second rechargeable battery charged by the solar cell; and
a power management circuit, comprising;
a control module;
a direct current/direct current (DC/DC) module connected between the solar cell and the control module, and configured for converting the DC power generated by the solar cell from one voltage level to another, and activating and maintaining the activation of the control module;
a switch controlled by the control module and connected between the second rechargeable battery and the DC/DC module, wherein the switch is turned on by the control module after the control module is activated, causing the DC power from the DC/DC module to charge the second rechargeable battery; and
a power supply switching module controlled by the control module to select the second rechargeable battery to power the electronic device if the voltage level of the rechargeable battery is lower than that of the second rechargeable battery.
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Accused Products
Abstract
An electronic device includes a first rechargeable battery, a solar cell mounted on the electronic device, a second rechargeable battery and a power management circuit. The power management circuit includes a control module, a DC/DC module, a switch and a power supply switching module. The DC/DC module is configured for converting the DC power generated by the solar cell from one voltage level to another, and activating and maintaining the activation of the control module. The switch is turned on by the control module when the control module is activated, causing the DC power from the DC/DC module to charge the second rechargeable battery. The power supply switching module is controlled by the control module to select the second rechargeable battery to power the electronic device if the voltage level of the rechargeable battery is lower than that of the second rechargeable battery.
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Citations
4 Claims
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1. An electronic device, comprising:
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a first rechargeable battery; a solar cell mounted on the electronic device and configured for receiving ambient light beams and transform received light beams into DC voltage; a second rechargeable battery charged by the solar cell; and a power management circuit, comprising; a control module; a direct current/direct current (DC/DC) module connected between the solar cell and the control module, and configured for converting the DC power generated by the solar cell from one voltage level to another, and activating and maintaining the activation of the control module; a switch controlled by the control module and connected between the second rechargeable battery and the DC/DC module, wherein the switch is turned on by the control module after the control module is activated, causing the DC power from the DC/DC module to charge the second rechargeable battery; and a power supply switching module controlled by the control module to select the second rechargeable battery to power the electronic device if the voltage level of the rechargeable battery is lower than that of the second rechargeable battery. - View Dependent Claims (2)
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3. A power management circuit applied in an electronic device, the electronic device comprising a first rechargeable battery, a solar cell, and a second rechargeable battery, the power management circuit comprising:
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a control module; a direct current/direct current (DC/DC) module connected between the solar cell and the control module, and configured for converting the DC power generated by the solar cell from one voltage level to another, and activating and maintaining the activation of the control module; a switch controlled by the control module and connected between the second rechargeable battery and the control module, the switch is turned on by the control module when the control module is activated, causing the DC power from the DC/DC module to charge the second rechargeable battery; and a power supply switching module controlled by the control module to select the second rechargeable battery to power the electronic device if the voltage level of the rechargeable battery is lower than that of the second rechargeable battery. - View Dependent Claims (4)
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Specification