CIRCUIT CONFIGURATION FOR PRODUCING A SWITCHING SIGNAL FOR A CURRENT-CONTROLLED SWITCH-MODE POWER SUPPLY
First Claim
1. A circuit configuration for producing a switching signal for a current-controlled switch-mode power supply having transformer with at least one primary winding and with at least one secondary winding and an input DC voltage, comprising:
- a controlled power switch to be connected to the input DC voltage in series with the at least one primary winding;
a drive circuit connected to said power switch, said drive circuit switching said power switch on and off clocked in time with a signal having a clock frequency;
a current measurement device connected to said power switch, said current measurement device measuring a current level through said power switch and producing a measurement signal being a measure of said measured current level;
a reference signal source producing a reference signal, said reference signal being a constant reference signal independent of time;
a comparator circuit connected to said drive circuit, to said current measurement device, and to said reference signal source, said comparator circuit comparing said measurement signal with said reference signal and signaling said drive circuit to switch off said power switch when said measurement signal is greater than said reference signal; and
said reference signal source having an associated compensation signal source producing a compensation signal varying with time, said reference signal being obtained from a sum of said constant reference signal and said compensation signal, said reference signal at a time at which said power switch is switched on having a value less than at a time of said signal at which said power switch is switched off.
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Accused Products
Abstract
A circuit configuration for generating a switching signal for a current controlled switched mode power supply includes a transformer with windings, a controlled power breaker, in series with a primary winding and a supply DC voltage, a control circuit, for cycle clocked switching of the power switch, a current measuring device measuring the current flowing through the power switch and generating a measured signal as a measure of the measured current value, a reference signal source generating a time-independent constant reference signal, and a comparator circuit comparing the measured signal with the reference signal and signaling the control circuit to switch off the power switch when the measured signal is greater than the reference signal. The reference signal source is connected to a compensation signal source to generate a compensation signal changing over time, the reference signal arising from the sum of the constant reference signal and the compensation signal.
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Citations
36 Claims
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1. A circuit configuration for producing a switching signal for a current-controlled switch-mode power supply having transformer with at least one primary winding and with at least one secondary winding and an input DC voltage, comprising:
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a controlled power switch to be connected to the input DC voltage in series with the at least one primary winding;
a drive circuit connected to said power switch, said drive circuit switching said power switch on and off clocked in time with a signal having a clock frequency;
a current measurement device connected to said power switch, said current measurement device measuring a current level through said power switch and producing a measurement signal being a measure of said measured current level;
a reference signal source producing a reference signal, said reference signal being a constant reference signal independent of time;
a comparator circuit connected to said drive circuit, to said current measurement device, and to said reference signal source, said comparator circuit comparing said measurement signal with said reference signal and signaling said drive circuit to switch off said power switch when said measurement signal is greater than said reference signal; and
said reference signal source having an associated compensation signal source producing a compensation signal varying with time, said reference signal being obtained from a sum of said constant reference signal and said compensation signal, said reference signal at a time at which said power switch is switched on having a value less than at a time of said signal at which said power switch is switched off. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 27, 28, 29, 32, 33, 34, 35, 36)
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25. A circuit configuration for producing a switching signal for a current-controlled switch-mode power supply, comprising:
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an input DC voltage source providing an input DC voltage;
a transformer with at least one primary winding and with at least one secondary winding;
a controlled power switch connected to said input DC voltage source in series with said at least one primary winding;
a drive circuit connected to said power switch, said drive circuit switching said power switch on and off clocked in time with a signal having a clock frequency;
a current measurement device connected to said power switch, said current measurement device measuring a current level through said power switch and producing a measurement signal being a measure of said measured current level;
a reference signal source producing a reference signal, said reference signal being a constant reference signal independent of time;
a comparator circuit connected to said drive circuit, to said current measurement device, and to said reference signal source, said comparator circuit comparing said measurement signal with said reference signal and signaling said drive circuit to switch off said power switch when said measurement signal is greater than said reference signal; and
said reference signal source having an associated compensation signal source producing a compensation signal varying with time, said reference signal being obtained from a sum of said constant reference signal and said compensation signal, said reference signal at a time at which said power switch is switched on having a value less than at a time of said signal at which said power switch is switched off. - View Dependent Claims (26, 30, 31)
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Specification