Power supply having dual ramp control circuit

Details Power supply having dual ramp control circuit Power supply having dual ramp control circuit

1985-12-13

1987-06-16

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

323222, 323288, H02M 3335

Patent

active

046740201

ABSTRACT:
A power supply (100) includes a first lead (12) for receiving an input voltage (Vin) and an inductor (L1) and a switching transistor (Q1) coupled in series between the input lead and ground. The node (N1) between the inductor (L1) and switching transistor (Q1) is coupled through a diode (D1) to an output terminal (14). When the switching transistor is on current flow causes energy to be stored in the inductor. When the switching transistor turns off, the energy stored in the inductor is provided to a load (RL) coupled to the output terminal. The on-time of the transistor is controlled by a comparator (20) which receives a first voltage (V3) proportional to the current through the switching transistor and a second voltage (V4). The second voltage decreases linearly with respect to time at a rate dependent on the difference between the voltage at the output terminal (Vout) and a reference voltage (Vref). Because of this, the power supply is insensitive to voltage spikes which may appear on the first input lead of the comparator.

REFERENCES:
patent: 4180852 (1979-12-01), Koizumi et al.
patent: 4272805 (1981-06-01), Iguchi et al.
patent: 4422138 (1983-12-01), Kornrumpf
patent: 4435746 (1984-03-01), Barnett
patent: 4447841 (1984-05-01), Kent
patent: 4453206 (1984-06-01), Voight
Hsu et al., "Modelling and Analysis of Switching DC-to-DC Converters in Constant-Frequency Current-Programmed Mode", IEEE Power Electronics Conference, Jun., 1979.
Hill, et al., "Two SMPS Integrated Circuits for Telecommunications Applications".

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