Switching circuit for producing an adjustable output characteristic
First Claim
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1. A circuit for generating an output voltage (Vout) comprising:
- a constant voltage control circuit (1) which receives a voltage supply (VSUPPLY) and generates the output voltage (VOUT);
a current reduction section (2) which receives a control voltage (VCONTROL) and generates a control current (IC) which produces a change in the output voltage (VOUT); and
a limiter section (3) which receives a lower and an upper limit voltage (VLIMIT1, VLIMIT2) and blocks or activates the current reduction section (2) responsive to the control voltage (VCONTROL);
wherein the constant voltage control circuit (1) further comprises a programmable reference voltage generator (10) wherein output voltage (VOUT) can be adjusted via a voltage divider (13, 14, 15); and
wherein the voltage divider (13, 14, 15) includes a first ohmic section with two resistors (13, 14) and a second ohmic section with one resistor (15).
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Abstract
The invention relates to a circuit to generate an output characteristic, having a constant voltage control circuit which receives a voltage supply and generates a constant output voltage; a current reduction section, which receives a control voltage and, depending on this, generates a control current which produces a change in the output voltage; and a limiter section which receives a lower and an upper limit voltage and optionally blocks or activates the current reduction section.
The invention also relates to a corresponding method to generate an output characteristic.
9 Citations
9 Claims
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1. A circuit for generating an output voltage (Vout) comprising:
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a constant voltage control circuit (1) which receives a voltage supply (VSUPPLY) and generates the output voltage (VOUT); a current reduction section (2) which receives a control voltage (VCONTROL) and generates a control current (IC) which produces a change in the output voltage (VOUT); and a limiter section (3) which receives a lower and an upper limit voltage (VLIMIT1, VLIMIT2) and blocks or activates the current reduction section (2) responsive to the control voltage (VCONTROL); wherein the constant voltage control circuit (1) further comprises a programmable reference voltage generator (10) wherein output voltage (VOUT) can be adjusted via a voltage divider (13, 14, 15); and
wherein the voltage divider (13, 14, 15) includes a first ohmic section with two resistors (13, 14) and a second ohmic section with one resistor (15). - View Dependent Claims (2, 3)
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4. A circuit for generating an output voltage (VOUT) comprising:
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a constant voltage control circuit (1) which receives a voltage supply (VSUPPLY) and generates the output voltage (VOUT); a current reduction section (2) which receives a control voltage (VCONTROL) and generates a control current (IC) which produces a change in the output voltage (VOUT); and a limiter section (3) which receives a lower and an upper limit voltage (VLIMIT1, VLIMIT2) and blocks or activates the current reduction section (2) responsive to the control voltage (VCONTROL); wherein the limiter section (3) comprises a comparator (30, 31) which receives the lower and the upper limit voltage (VLIMIT1, VLIMIT2) as well as the control voltage (VCONTROL), and generates a comparator output signal and wherein the limiter section (3) blocks or activates the current reduction section (2) as a function of the comparator output signal; and wherein the comparator output signal of the limiter section (3) is connected to a first switching element (22) of the current reduction section (2) to activate or block the control current (IC). - View Dependent Claims (5, 6, 7, 8, 9)
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Specification