Pulse width modulator and loading system thereof

A loading system, coupled to a power terminal, the loading system comprising:

• a boosting circuit having an input terminal, coupled to the power terminal for selectively receiving an operational voltage therefrom, and an output terminal;
• a pulse width modulator, coupled to the output terminal of the boosting circuit, comprising:
• an amplitude-adjustable triangle-wave generator, adapted to receive a feedback voltage from the boosting circuit and to perform an amplitude operation according to a reference voltage and the feedback voltage for generating an amplitude-adjustable triangle wave according to a variation of the feedback voltage;
• an error signal generator, adapted to perform an error operation according to the feedback voltage and the reference voltage for outputting an error signal;
• a pulse signal generator, coupled to the amplitude-adjustable triangle-wave generator and the error signal generator, adapted to receive and compare the error signal and the amplitude-adjustable triangle wave for outputting a pulse controlling signal;
• a driving circuit, coupled to the pulse signal generator, adapted to receive and transform the pulse generating signal for outputting a driving signal;
• and
• a switch having a first terminal, coupled to the driving circuit, a second terminal coupled to the power terminal, and a third terminal coupled to a ground terminal, the turning on or turning off of the switch depends on the driving signal.

A loading system, coupled to a power terminal, the loading system comprising:

• a buck circuit, having an input terminal coupled to the power terminal for selectively receiving an operational voltage therefrom, and an output terminal;
• a pulse width modulator, coupled to the output terminal of the buck circuit, comprising:
• an amplitude-adjustable triangle-wave generator, adapted to receive a feedback voltage from the buck circuit and to perform an amplitude operation according to a reference voltage and the feedback voltage for generating an amplitude-adjustable triangle wave according to a variation of the feedback voltage;
• an error signal generator, adapted to perform an error operation according to the feedback voltage and the reference voltage for outputting an error signal;
• a pulse signal generator, coupled to the amplitude-adjustable triangle-wave generator and the error signal generator, adapted to receive and compare the error signal and the amplitude-adjustable triangle wave for outputting a pulse controlling signal;
• a driving circuit, coupled to the pulse signal generator, adapted to receive and transform the pulse generating signal for outputting a driving signal;
• and
• a switch, having a first terminal coupled to the driving circuit, a second terminal coupled to the power terminal, and a third terminal coupled to a ground terminal, the turning on or turning off of the switch depends on the driving signal.

A loading system coupled to a power terminal, the loading system comprising:

• a push-pull circuit, having an input and an output terminal, the output terminal outputting a feedback voltage;
• a pulse width modulator, coupled to the output terminal of the push-pull circuit, comprising:
• an amplitude-adjustable triangle-wave generator, adapted to receive the feedback voltage from the push-pull circuit and to perform an amplitude operation according to a reference voltage and the feedback voltage for generating an amplitude-adjustable triangle wave according to a variation of the feedback voltage;
• an error signal generator, adapted to perform an error operation according to the feedback voltage and the reference voltage for outputting an error signal;
• a pulse signal generator, coupled to the amplitude-adjustable triangle-wave generator and the error signal generator, adapted to receive and compare the error signal and the amplitude-adjustable triangle wave for outputting a pulse controlling signal;
• a driving circuit, coupled to the pulse signal generator, adapted to receive and transform the pulse generating signal for outputting a driving signal;
• and
• a switch, having a first terminal coupled to the driving circuit, a second terminal coupled to the power terminal, and a third terminal coupled to a ground terminal, the turning on or turning off of the switch depends on the driving signal.

A loading system coupled to a power terminal, the loading system comprising:

• a full-bridge circuit, having an input and an output terminal, the output terminal outputting a feedback voltage;
• a pulse width modulator, coupled to the output terminal of the full-bridge circuit, comprising:
• an amplitude-adjustable triangle-wave generator, adapted to receive the feedback voltage from the full-bridge circuit and to perform an amplitude operation according to a reference voltage and the feedback voltage for generating an amplitude-adjustable triangle wave according to a variation of the feedback voltage;
• an error signal generator, adapted to perform an error operation according to the feedback voltage and the reference voltage for outputting an error signal;
• a pulse signal generator, coupled to the amplitude-adjustable triangle-wave generator and the error signal generator, adapted to receive and compare the error signal and the amplitude-adjustable triangle wave for outputting a pulse controlling signal;
• a driving circuit, coupled to the pulse signal generator, adapted to receive and transform the pulse generating signal for outputting a driving signal;
• and
• a switch, having a first terminal coupled to the driving circuit, a second terminal coupled to the power terminal, and a third terminal coupled to a ground terminal, the turning on or turning off of the switch depends on the driving signal.

A loading system coupled to a power terminal, the loading system comprising:

• a half-bridge circuit, having an input and an output terminal, the output terminal outputting a feedback voltage;
• a pulse width modulator, coupled to the output terminal of the half-bridge circuit, comprising:
• an amplitude-adjustable triangle-wave generator, adapted to receive the feedback voltage from the half-bridge circuit and to perform an amplitude operation according to a reference voltage and the feedback voltage for generating an amplitude-adjustable triangle wave according to a variation of the feedback voltage;
• an error signal generator, adapted to perform an error operation according to the feedback voltage and the reference voltage for outputting an error signal;
• a pulse signal generator, coupled to the amplitude-adjustable triangle-wave generator and the error signal generator, adapted to receive and compare the error signal and the amplitude-adjustable triangle wave for outputting a pulse controlling signal;
• a driving circuit, coupled to the pulse signal generator, adapted to receive and transform the pulse generating signal for outputting a driving signal;
• and
• a switch, having a first terminal coupled to the driving circuit, a second terminal coupled to the power terminal, and a third terminal coupled to a ground terminal, the turning on or turning off of the switch depends on the driving signal.