pulsbreitenmodulierter bru00fcckenverstu00e4rker with konfigurierbarem eingangsnetzwerk for analog or digital input without the use of a dreieckwellengenerators

摘要

A low frequency PWM output bridge amplifier having an input network configurable for standard PWM digital input signals, phase shift PWM digital input signals or analog input signals and for standard PWM output or phase shift PWM output, comprises two identical amplifying modules (1, 2), one (1) for the amplifying channel relative to the direct or positive PWM output (Vo-If+) and the other (2) for the amplifying channel relative to the inverted or negative PWM output (Vo-If+). Each modules includes a switching output operational amplifier (O1), having a voltage mode noninverting input (In+), a current mode inverting input (In-) and a loop filter implementing a single or multiple slope integrator outputting a signal of a substantially triangular waveform, a logic inverter or a cascade of logic inverters (C1) coupled in cascade to the output of the integrator (O1, LOOP FILTER) and outputting a logic PWM signal, an output power stage (P1) converting the logic PWM signal output by said inverter or cascade of logic inverters (C1) in a PWM signal, switching between the potentials of the two supply rails of the circuit, and a feedback resistor (Rf) connecting the output of power stage (P1) to the inverting input (In-) of said operational amplifier (O1). IMAGE