Device of pulse width modulation type for load drive
View Patent ↗A device of pulse width modulation type for load drive according to the present invention includes a first output unit ( 3 ) that applies a first output signal (e) to a load ( 5 ) in response to a first drive timing signal (c), a second output unit ( 4 ) that applies a second output signal (f) to the load ( 5 ) in response to a second drive timing signal (d), a signal converter ( 1 ) that converts a drive input signal (a) into a parallel signal (b), the drive input signal indicating time information allowing a potential difference to be generated across the load ( 5 ), and a drive timing generator ( 2 ) that generates the first and second drive timing signals (c, d) in response to the parallel signal (b), the load ( 5 ) being driven by increasing and reducing pulse widths of the first and second output signals (e, f).
1. A device of pulse width modulation type for load drive comprising:
a first output unit that applies a first output signal to one end of a load in response to a first drive timing signal;
a second output unit that applies a second output signal to the other end of the load in response to a second drive timing signal;
a signal converter that converts a drive input signal into a parallel signal, the drive input signal being a serial signal indicating, in any number of bits, time information allowing a potential difference to be generated across the load during each predetermined interval; and
a drive timing generator that generates the first and second drive timing signals in response to the parallel signal, wherein
the load is driven by increasing and reducing pulse widths of the first and second output signals.
2. The device of pulse width modulation type for load drive according to claim 1 , wherein the drive timing generator has a drive determining unit that generates a drive determining signal indicating a result of determination of to which of the first and second output units the drive timing signal having a pulse width corresponding to the differential voltage time information is to be passed, on the basis of one of the drive input signal and the parallel signal as well as the last first and second drive timing signals, or one of the drive input signal and the parallel signal as well as the last first and second output signals, wherein
the first and second drive timing signals corresponding to one of the current drive input signal and the current parallel signal are generated in accordance with the drive determining signal.
3. A device of pulse width modulation type for load drive comprising:
a signal converter that converts a serial signal having differential voltage time information and output section information into a parallel signal;
an output section determining unit that receives the parallel signal having the output section information as an input to generate a parallel signal capturing instruction and an output start timing instruction; and
a plurality of output sections provided in association with a plurality of loads,
each of the plurality of output sections comprising:
a register which captures the parallel signal having the differential voltage time information in response to the parallel signal capturing instruction;
a drive timing signal generator that uses the parallel signal stored in the register to start generating a drive timing signal in response to the output start timing instruction; and
an output unit that generates an output signal in response to the drive timing signal, wherein
the plurality of loads are driven by the serial signal.