Programmable dynamic voltage control apparatus
The present invention relates to a programmable dynamic voltage control apparatus, and more particularly, to a programmable dynamic voltage control apparatus which is capable of dynamically controlling voltage conversion of an output unit using data set in programmable memories, when various pieces of information sensed by a variety of sensors mounted in a vehicle are converted into electrical signals and then transmitted.
1. A programmable dynamic voltage control apparatus comprising:
an n-bit channel data storage unit configured to store an n-bit digital input channel selection number and one or more programmable dynamic data for setting divided voltages corresponding to the n-bit digital input channel selection number, and provide the stored n-bit digital input channel selection number and dynamic data for setting the 2 n divided voltages to a voltage division unit;
the voltage division unit configured to equally divide an input voltage to generate 2 N divided voltages V M (i) where i ranges from 1 to 2 N and N is the number of necessary steps, select the 2 n divided voltages corresponding to the n-bit digital input channel selection number from the 2 N divided voltages V M (i) through the programmable dynamic data provided from the n-bit channel data storage unit, and maps the selected 2 n divided voltages to 2 n applied voltages V(j) of a D/A conversion unit; and
the D/A conversion unit configured to be turned on/off by receiving the 2 n applied voltage V(j) mapped through the programmable dynamic data and receiving a digital sensor signal sensed through a sensor of a vehicle as input signals of n channels, and output an analog signal corresponding to the digital input signal of each channel.
2. The programmable dynamic voltage control apparatus of claim 1 , wherein the n-bit channel data storage unit stores the n-bit digital input channel selection number and the one or more programmable dynamic data for setting the 2 n divided voltages corresponding to the n-bit digital input channel selection number into n-bit channel memories corresponding to the respective n digital input channels.
3. The programmable dynamic voltage control apparatus of claim 1 , wherein the n-bit channel data storage unit comprises a nonvolatile RAM which maintains data stored therein even though power supply is cut off.
4. The programmable dynamic voltage control apparatus of claim 1 , wherein the voltage division unit comprises:
a divided voltage generation unit including an impedance string to equally divide the input voltage into 2 N voltages and configured to generate 2 N divided voltages V M (i) at each node of the impedance string where i ranges from 1 to 2 N and N is the number of necessary steps; and
a divided voltage mapping unit configured to select the 2 N divided voltages corresponding to the n-bit digital input channel selection number from the 2 N divided voltages V M (i) of the divided voltage generation unit through the programmable dynamic data provided from the n-bit channel data storage unit, and map the selected 2 n divided voltages to the 2 n applied voltages V(j) of the D/A conversion unit.
5. The programmable dynamic voltage control apparatus of claim 4 , wherein the divided voltage generation unit comprises the impedance string having (2 N +1) impedance elements for equally dividing the input voltage into the 2 N divided voltages V M (i), and generates the 2 N divided voltages through at each node between the respective impedance elements of the impedance string.
6. The programmable dynamic voltage control apparatus of claim 5 , wherein the respective impedance elements forming the impedance string are implemented with resistors having the same impedance value.
7. The programmable dynamic voltage control apparatus of claim 4 , wherein the divided voltage mapping unit comprises a plurality of switch strings each having a plurality of switches corresponding to n-bit data provided from the n-bit channel data storage unit and arranged in parallel to correspond to the 2 n divided voltages set according to the n-bit digital input channel selection number, and
the n-bit data are directly inputted to or inverted through inverters and then inputted to gates of the switches forming each of the switch strings, and any one of the divided voltages corresponding to the digital input channel selection number is selected and outputted according to the on/off operations of the respective switches of the switch string.
8. The programmable dynamic voltage control apparatus of claim 1 , wherein the D/A conversion unit comprises a plurality of switch strings each having a plurality of switches corresponding to the digital input signals of the n channels sensed through the sensor of the vehicle and arranged in parallel to correspond to the 2 n divided voltages according to the n-bit digital input channel selection number,
the digital input signals of the n channels, sensed through the sensor of the vehicle, are directly inputted to or inverted through inverters and then inputted to gates of the switches forming each of the switch strings, and any one of the divided voltages corresponding to the digital input channel selection number is selected and outputted according to the on/off operations of the respective switches of the switch string, and
the drain terminals of the respective switch strings are commonly coupled to an input terminal of an op-amplifier to select and amplify one applied voltage V(j) for the n-th channel.