Voltage-converter arrangement and method for voltage conversion

摘要

A voltage-converter arrangement comprises an arrangement input (11) for the supply of an input voltage (VIN), an arrangement output (12) for the provision of an output voltage (VOUT), a voltage converter (13) that is coupled on the input side to the arrangement input (11) and on the output side to the arrangement output (12), and a control device (20) with a control output (21). The control output (21) is coupled to the voltage converter (13). A control signal (SW) can be picked up at the control output (21). The control device (20) is designed to switch the frequency (f) of the control signal (SW) between values from a number N of predetermined, discrete frequency values. The voltage converter (13) is designed to convert the input voltage (VIN) into the output voltage (VOUT) as a function of the control signal (SW).

主权项

1. A voltage-converter arrangement comprising:
an arrangement input for the supply of an input voltage; an arrangement output for the provision of an output voltage; a voltage converter that is coupled on the input side to the arrangement input and on the output side to the arrangement output; and a control device comprising an oscillator arrangement, a window comparator and a control output that is coupled to the voltage converter and at which a control signal can be picked up, wherein the control device is configured to switch the frequency of the control signal between values from a number N of predetermined, discrete frequency values, wherein the voltage converter is configured to convert the input voltage into the output voltage as a function of the control signal, wherein the oscillator arrangement is coupled to the control output at an oscillator output and is configured for providing an oscillator signal with an oscillator frequency that has a value from the number N of predetermined, discrete frequency values, wherein the window comparator is coupled on the output side to a set input of the oscillator arrangement, wherein the window comparator comprises a first comparator and a second comparator, the first comparator having a first input terminal being connected to a first node and a second input terminal being connected via a first reference-voltage source to generate a first reference signal to a second node, the second comparator having a first input terminal being connected to the first node and a second input terminal being connected via a second reference-voltage source to generate a second reference signal to the second node, wherein the first comparator is configured to compare the first reference signal with the measurement signal and the second comparator is configured to compare the second reference signal with the measurement signal dropping between the first node and the second node, wherein each of the first node and the second node is coupled to the arrangement output, wherein a current source is arranged between the second node and the first node, and wherein a current-source voltage can be picked up across the current source and is used as the measurement signal.