Power management device for immediate start-up during power negotiation
The present invention relates to an energy management device ( 40 ) and a method of operating the same. The energy management device ( 40 ) comprising a buffer controller ( 41 ) and an energy buffer unit ( 45 ) wherein the buffer controller is configured to connect the energy buffer unit ( 45 ) to operate a load device upon detecting that the load device is in an accepting operational state and the voltage provided by a power supply device is between the first and second threshold, during a power negotiation period between the power supply device ( 10 ) and the load device ( 20 ).
1. An energy management device coupled to a power supply device, which is operable in a device detection mode where the power supply device periodically applies a voltage between a first threshold and a second threshold over a determined time period to detect a connection status of load devices, and in a power supply mode for providing power to load devices wherein the voltage is above the second threshold, and coupled to a load device operable in accordance with a predetermined power-acceptance criterion, in either an accepting operational state or a non-accepting operational state with respect to receiving power from the power supply device, the energy management device comprising:
an energy buffer,
a buffer controller, wherein the buffer controller is configured to detect that the load device is in the accepting operational state and the voltage provided by the power supply device has dropped below the second threshold and is between the first threshold and the second threshold, and to connect the energy buffer with the load device responsive to detecting that the load device is in the accepting operational state and the voltage provided by the power supply device has dropped below the second threshold and is between the first threshold and the second threshold, and to maintain connecting the energy buffer with the load device for a predetermined time after the voltage provided by the power supply device has dropped below the second threshold.
2. The energy management device according to claim 1 , wherein the energy management device is integrated in the load device.
3. The energy management device according to claim 1 , wherein the energy management device is coupled in a daisy chain between the power supply equipment and the load device.
4. The energy management device according to claim 1 , further comprising a charging control circuit for charging the energy buffer.
5. The energy management device according to claim 1 , wherein the energy management device is configured to receive activation and/or configuration settings for operation the load device.
6. The energy management device according to claim 1 , wherein the energy management device is configured to generate and transmit a report message about a power failure to a corresponding management system if the voltage provided by the power supply device in the power supply mode dropped below the second threshold.
7. The energy management device according to claim 6 , wherein the energy management device is configured to buffer the report message for retransmission until the voltage provided by the power supply device is between the first threshold and the second threshold.
8. The energy management device according to claim 6 , wherein the energy management device is configured to provide a timestamp to the report message.
9. The energy management device according to claim 1 , further comprising a memory to store configuration settings of the load device.
10. The energy management device according to claim 9 , wherein the buffer controller is configured to connect the energy buffer to operate the load device according to the configuration settings stored in the memory upon detecting that the load device is in the accepting operational state and a voltage provided by the power supply device dropped below the second threshold.
11. A method for operating an energy management device coupled to a power supply device, which is operable in a device detection mode where the power supply device periodically applies a voltage between a first threshold and a second threshold over a determined time period to detect a connection status of load devices, and in a power supply mode for providing power to load devices wherein the voltage is above the second threshold, and to a load device operable in accordance with a predetermined power-acceptance criterion, in either an accepting operational state or a non-accepting operational state with respect to receiving power from the power supply device, the method comprising:
detecting that the load device is in the accepting operational state and the voltage provided by the power supply device dropped below the second threshold and is between the first threshold and the second threshold, and only performing the step of
connecting an energy buffer of the energy management device with the load device responsive to detecting that the load device is in the accepting operational state and the voltage provided by the power supply device dropped below the second threshold and is between the first threshold and the second threshold, and maintaining connecting the energy buffer with the load device for a predetermined time after the voltage provided by the power supply device has dropped below the second threshold.
12. The method according to claim 11 , further comprising determining whether a variable indicative of a first start for the load device is set to false and performing the step of connecting the energy buffer to operate the load device only if the variable indicative of the first start is set to false; wherein the variable indicative of the first start is set to true after a predetermined off time of the load device and the variable indicative of the first start of the load device is set to false after receiving power from the power supply device.