Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1999-02-17
2000-06-20
Berhane, Adolf Deneke
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
G05F 140
Patent
active
06078170&
ABSTRACT:
In order to avoid damage to a switching regulator in the event of short-circuiting of a load, and to reduce power consumption, the maximum duty ratio of a PWM type switching regulator is provided with a supply voltage dependency. A control circuit for a PWM type switching regulator according to a first embodiment comprises an error amplifier for producing an error signal based on a difference between a fed back portion of a regulated output voltage of a PWM type switching regulator and a first reference voltage, a first circuit for producing a pulse output signal having successive pulses the width of which is dependent upon the value of the error signal, such that the value of the regulated output voltage of the PWM type switching regulator is regulated by the first circuit, and a second circuit for producing a second pulse output signal for modulating the first periodic pulse output signal, the second pulse output signal having successive pulses the width of which is dependent upon the value of the second reference voltage so that the maximum duty cycle of the voltage regulator is dependent upon the second reference voltage. The second reference voltage varies depending upon the value of a power supply voltage of the PWM type switching regulator so that the maximum duty ratio is increased when the power supply voltage decreases and the maximum duty ratio decreases when the power supply voltage increases.
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patent: 5703473 (1997-12-01), Phillips et al.
patent: 5838147 (1998-11-01), Suzuki et al.
Berhane Adolf Deneke
Seiko Instruments Inc.
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