DC Current Detection and Protection Circuit and Class D Amplifier Using It
A class D amplifier, detection and protection technology, which is applied to amplifiers with semiconductor devices/discharge tubes, amplifier protection circuit layout, amplifiers, etc. consumption effect
Active Publication Date: 2018-11-23
上海矽力杰微电子技术有限公司
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Problems solved by technology
[0004] When the existing class-D amplifier is damaged or the input port is short-circuited, direct current (DC) current will flow into the class-D amplifier and be amplified and then input to the subsequent circuit (such as a speaker). If the DC current is large enough And if it lasts for a long time, it will cause damage to the subsequent circuit
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[0058] The present invention is described below based on examples, but the present invention is not limited to these examples only. In the following detailed description of the invention, some specific details are described in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. Well-known methods, procedures, procedures, components and circuits have not been described in detail in order to avoid obscuring the essence of the present invention.
[0059] Furthermore, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
[0060] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is referred to as being "connected"...
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The invention discloses a DC detection protection circuit and a D type amplifier applying the same. The DC detection protection circuit detects two paths of differential pulse width modulation signals which are complementary in an ideal state (output signals of the pulse width modulation circuit of the D type amplifier), compares difference values between the duty ratio of one path of the pulse width modulation signals and the duty ratio of the other path of the pulse width modulation signals, judges a fact that a DC is input to the D type amplifier when the difference value of the duty ratios is too great and outputs a protection signal to protect the D type amplifier. Therefore, whether the DC exists in the input signal of the D type amplifier can be detected at a relatively low power consumption, and protection can be provided for the D type amplifier. In addition, due to the synchronization to the pulse width modulation signal of the D type amplifier, real-time detection can be realized.
Description
technical field [0001] The invention relates to electronic circuit technology, in particular to a DC current detection protection circuit and a class D amplifier applying the same. Background technique [0002] Class D amplifier circuit is a switch-type power amplifier circuit. Compared with linear power amplifier circuits, it has the characteristics of high efficiency and less heat generation, so it is widely used in the field of consumer electronic products such as smart TVs and mobile phones. [0003] figure 1 It is the circuit diagram of the existing class D amplifier. like figure 1 As shown, the class D amplifier in the prior art generally includes an integrating circuit 1, a pulse width modulation circuit 2, a driving power stage circuit 3 and a feedback circuit ( figure 1 feedback resistor in ). By inputting the differential audio signal to the integrating circuit 1, the integrating circuit superimposes the differential audio signal and the feedback signal of the ...
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IPC IPC(8): H03F1/52H03F3/217
CPCH03F1/52H03F3/217
Inventor 朱华平许江平严一宇吴其昌
Owner 上海矽力杰微电子技术有限公司