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D type amplifier and modulating method thereof

A class D amplifier, modulation method technology, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, logic circuit coupling/interface using field effect transistors, etc., can solve the problem of high load current loss, low efficiency, and current loss Can not effectively reduce and other problems, to achieve the effect of improving work efficiency and reducing load current loss

Inactive Publication Date: 2007-08-22
APEXONE MICROELECTRONICS SHANGHAI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the Class D amplifier adopts the "four-state" modulation method, the switching current will generate a peak current, and it needs to be reversed four times, so the current loss cannot be effectively reduced.
[0008] Therefore, it can be seen from the voltage and current waveforms at the load end that the circuit of the Class D amplifier disclosed in US Patent No. 6,211,728 still has the defects of high load current loss and low efficiency.

Method used

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  • D type amplifier and modulating method thereof
  • D type amplifier and modulating method thereof
  • D type amplifier and modulating method thereof

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Embodiment Construction

[0024] The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings.

[0025] FIG. 1 , FIG. 2 and FIG. 3 respectively show three working states of a class D amplifier in the prior art during use. more specifically:

[0026] FIG. 1 shows a situation in which NMOS transistors MN1 and MN2 are simultaneously turned on and PMOS transistors MP1 and MP2 are simultaneously turned off in a class D amplifier in the prior art;

[0027] FIG. 2 shows a situation in which the NMOS transistor MN2 and the PMOS transistor MP1 are simultaneously turned on, and the NMOS transistor MN1 and the PMOS transistor MP2 are simultaneously turned off in the class D amplifier in the prior art;

[0028] FIG. 3 shows a situation in which the NMOS transistor MN1 and the PMOS transistor MP2 are simultaneously turned on, and the NMOS transistor MN2 and the PMOS transistor MP1 are simultaneously turned off in the class D amplifier in the ...

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Abstract

A D type of amplifier consists of pulse width modulation circuit for making pulse width modulation on input signal and for generating two-path of output signal, logic control circuit for using said two-path output signal of said modulation circuit as two-path of input signal on logic control circuit and for forming two-path of output signal on logic control circuit after two-path of input signal of said control circuit is processed by logic operation, H-bridge circuit for using two-path of output signal on logic control circuit as two-path of input signal on H-bridge circuit to drive device.

Description

technical field [0001] The invention relates to a power amplifier and a modulation method thereof, in particular to a class D power amplifier and a modulation method thereof. Background technique [0002] At present, amplifiers can be divided into four types: A, B, C, and D according to the conduction angle of the signal. As power amplifiers are more and more widely used in the field of electronic technology, Class D amplifiers are more and more popular because they work in a switch state and are quickly turned on and off when they are turned on. At the same time, the power consumption and efficiency of Class D amplifiers are increasingly becoming the key performance indicators of the device. [0003] FIG. 1 shows a situation in which NMOS switches MN1 and MN2 are turned on at the same time, and PMOS switches MP1 and MP2 are turned off at the same time in a class D amplifier device in the prior art. Among them, A and B are used as the output signal of the pulse width modul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/217H03K4/08H03K19/0185
Inventor 李嘉穗袁廷志万幸
Owner APEXONE MICROELECTRONICS SHANGHAI