Load voltage control for a field device
First Claim
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1. A load voltage controller for a field device, comprising:
- a DC/DC converter adapted to receive a power supply voltage signal (Ui) on a power supply line of the field device for conversion into a load voltage signal (Uo) and subsequent supply to a load of the field device;
a comparison unit adapted to compare the load voltage signal (Uo) with an externally supplied load voltage reference signal (Uref); and
an energy buffer adapted to store supplied energy when an output signal of the comparison unit indicates that the load voltage signal (Uo) exceeds the load voltage reference signal (Uref).
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Abstract
To enable a relatively constant output voltage at a DC/DC converter of a field device during a predictable time after shut-down of energy supplied to the DC/DC converter there is proposed a load voltage controller having a comparison unit adapted to compare the load voltage signal (Uo) with an externally supplied load voltage reference signal (Uref). When the load voltage (Uo) exceeds the load voltage reference signal (Uref) an energy buffer stores supplied energy for subsequent resupply to the load of the field device.
17 Citations
28 Claims
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1. A load voltage controller for a field device, comprising:
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a DC/DC converter adapted to receive a power supply voltage signal (Ui) on a power supply line of the field device for conversion into a load voltage signal (Uo) and subsequent supply to a load of the field device;
a comparison unit adapted to compare the load voltage signal (Uo) with an externally supplied load voltage reference signal (Uref); and
an energy buffer adapted to store supplied energy when an output signal of the comparison unit indicates that the load voltage signal (Uo) exceeds the load voltage reference signal (Uref). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A load voltage control method for a field device comprising:
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receiving a power supply voltage signal (Ui) on a power supply line of the field device for conversion into a load voltage signal (Uo) and subsequent supply of the load voltage signal (Uo) to a load of the field device;
comparing the load voltage signal (Uo) with an externally supplied load voltage reference signal (Uref); and
storing energy being supplied through the power supply line in an energy buffer when the load voltage signal (Uo) exceeds the load voltage reference signal (Uref). - View Dependent Claims (22, 23, 24, 26, 27, 28)
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25. A load voltage control method for a field device including computer software running on a load voltage processor, the method comprising:
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loading the computer software into a memory associated with the load voltage processor;
receiving a power supply voltage signal (Ui) on a power supply line of the field device for conversion into a load voltage signal (Uo) and subsequent supply of the load voltage signal (Uo) to a load of the field device;
comparing the load voltage signal (Uo) with an externally supplied load voltage reference signal (Uref); and
storing energy being supplied through the power supply line in an energy buffer when the load voltage signal (Uo) exceeds the load voltage reference signal (Uref).
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Specification