SU1401561A1 - D-glass amplifier - Google Patents

Abstract

FIELD: amplification engineering, m. B. used in audio equipment and automation drives. The purpose of the invention is to increase efficiency. A class D amplifier contains a pulse-width modulator 1, a push-pull key stage performed on output switches 2 and 3, a low-pass filter 4, a load 5, a blocking source 6, an additional switch 7, differentiating circuits 8 and 9. A switching key 10, forcing circuits 11 and 12 are entered into the device, each of which is made on a parallel-connected diode and resistor and resistors 13 and 14. By choosing the time constant of the resistors of the forcing circuits 11 and 12 and the condies of the differentiating circuits 8 and 9, key 2 is turned on. after turning off of the key 3, which eliminates the possibility of through-flow currents, and this is due to increase efficiency. 1 il.

Description

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1 3 () b | tsiye refers to the ycH.HHTejibHofl technique and can be used in audio equipment and automation drives.

The purpose of the invention is to increase efficiency.

The drawing presents an electrical diagram of a class D ug / pggel.

A class D Usi pulse contains a 1-pulse modulator 1, a push-pull key stage, performed on the first 2 and second 3 output keys, a low-pass filter 4, a load 5, a blocking source 6, an additional switch 7, the first 8 and the second 9 differentiation circuit, switching key 10, the first 11 and the second 12 forcing circuits, the first 13 and second 14 resistors.

Class D amplifier works in the following ways.

The first 2 and second 3 output keys are controlled by pulse width modulator 1 in antiphase. Due to the inclusion of an unlocking signal (for example, the first output switch 2) of the first forcing circuit 11, the voltage at the input of the first output switch 2 increases from some negative voltage specified by the first resistor 13 at a given speed, which ensures the turn-on delay of the first output key 2. At the same time, a compelling voltage drop leads to unlocking of the commutating key 10. At the same time, the blocking voltage of the source 6 comes with a certain delay to the control input of the second output Nogo key 3.

Thus, the choice of the constant time of the resistors of the forcing chains 11, 12 and the capacitors of the differentiating chains 8 and 9 ensures that the first output switch 2 is turned on only after the second output switch 3 is turned off, which eliminates the possibility of flow of through currents

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Efficiency For another clock cycle, the class D amplifier works the same way.

Claims (1)

Invention Formula A class O amplifier containing a pulse-width modulator connected in series by a push-pull key cascade performed on the nerve and second output keys, a low-pass filter and a load, a source of blocking voltage connected via an additional key to the control input of the first output key, the first and second differentiating circuits, wherein the output of the first differentiating circuit is connected to the control input of an additional key, characterized in that, in order to increase the efficiency, the commutating Key, first and second forcing circuits, each of which is made on parallel-connected diode and resistor, first and second resistors, while the first output of the pulse-width modulator is connected through an irregular force circuit with the control input of the first output key and one From the terminals of the first resistor, the second terminal of which is connected to the source of blocking voltage, the second output of the pulse-width modulator is connected via the second forcing circuit to the control input of the second output switch and to one of the terminals V resistor, the second output of which is connected to a source of blocking voltage, connected via a switching key with a control input of the second output key, the control input of the first output key through a second differentiating circuit is connected to the control input of the switching key, and the control input of the first the output key is connected via the second differentiating circuit to the control input of the switching key, and the control input of the second output key is connected to the input of the first differentiating circuit.