Circuit arrangement for voltage switching
View Patent ↗A circuit arrangement for voltage switching is used for optimized control of switching transistors, which are used for switching voltages applied to an output of the circuit arrangement. The circuit arrangement of the invention enables rapid voltage switching with a simultaneously low current consumption.
1. A circuit arrangement for voltage switching, the circuit arrangement comprising:
a first input terminal for connecting a first voltage;
a second input terminal for connecting a second voltage;
an output terminal for outputting either the first voltage or the second voltage;
a first switching transistor, which is looped between the first input terminal and the output terminal;
a second switching transistor, which is looped between the second input terminal and the output terminal;
a voltage monitor with an input terminal and an output terminal, the input terminal of the voltage monitor being connected to the first input terminal of the circuit arrangement and a monitoring signal, dependent on the first voltage, is output at the output terminal of the voltage monitor;
a resistor, a third transistor, and a fourth transistor, which are looped in series between the second input terminal and a reference potential, a control terminal of the third transistor and a control terminal of the fourth transistor being connected to the output terminal of the voltage monitor;
a first inverter with an input terminal and an output terminal, the input terminal of the first inverter being connected to a connection node of the third transistor and the fourth transistor, and the first inverter being supplied by the second voltage;
a fifth transistor, a sixth transistor, and a seventh transistor, which are looped in series between the second input terminal and the reference potential, a control terminal of the sixth transistor and a control terminal of the seventh transistor being connected to the output terminal of the voltage monitor, a control terminal of the fifth transistor being connected to the output terminal of the first inverter, and a control terminal of the first switching transistor being connected to a connection node of the sixth transistor and the seventh transistor; and
a second inverter being connected to an input terminal and an output terminal, the input terminal of the second inverter being connected to the connection node of the sixth transistor and the seventh transistor, a control terminal of the second switching transistor being connected to the output terminal of the second inverter, and the second inverter being supplied via decoupling diodes by the first or by the second voltage.
2. A circuit arrangement according to claim 1 , wherein the first switching transistor is a PMOS transistor, whose drain-source path is looped between the first input terminal and the output terminal and whose gate terminal is connected to the connection node of the sixth transistor and the seventh transistor.
3. A circuit arrangement according to claim 1 , wherein the second switching transistor is a PMOS transistor, whose drain-source path is looped between the second input terminal and the output terminal and whose gate terminal is connected to the connection node of the second inverter.
4. A circuit arrangement according to claim 1 , wherein the third transistor is a PMOS transistor and the fourth transistor is an NMOS transistor, wherein the gate terminal of the third transistor and the gate terminal of the fourth transistor are connected to the output terminal of the voltage monitor.
5. A circuit arrangement according to claim 4 , wherein the resistor is connected to a terminal with the second voltage, and the drain-source path of the third transistor and the drain-source path of the fourth transistor are looped in series between the other terminal of the resistor and the reference potential.
6. A circuit arrangement according to claim 4 , wherein the third transistor is connected to a terminal of its drain-source path with the second voltage, the fourth transistor is connected to a terminal of its drain-source path with the reference potential, and the resistor is looped between the other terminal of the drain-source path of the third transistor and the other terminal of the drain-source path of the fourth transistor.
7. A circuit arrangement according to claim 1 , wherein the fifth transistor and the sixth transistor are PMOS transistors and the seventh transistor is an NMOS transistor, whereby the drain-source path of the fifth transistor, the drain-source path of the sixth transistor, and the drain-source path of the seventh transistor are looped in series between the second voltage and the reference potential, the gate terminal of the fifth transistor is connected to the output terminal of the first inverter, and the gate terminal of the sixth transistor and the gate terminal of the seventh transistor are connected to the output terminal of the voltage monitor.