KR20090084500A - Single switching power audio amplifier unifying power unit and amplification unit - Google Patents

Abstract

A single switching power audio amplifier integrating a power unit and an amplifying unit is provided to control an output of the amplifier by a winding ratio of a primary side to a secondary side of a transformer. A DC power unit(10) rectifies the power with AC and DC to the DC and supplies the rectified result. A switch unit(20) receives the DC power from a DC power unit and outputs a pulse width modulation switching waveform. A path switching unit(40) changes the path of the voltage and the current according to the volume of an input signal supplied from a transforming unit. A feedback unit(110) feeds back the audio signal from a filter unit to a signal input unit and corrects the distortion value when transmitting the input signal. A signal input unit outputs the signal comparing and amplifying the audio signal inputted from the feedback unit and the audio signal inputted from the outside. A first control unit(90) receives the output signal of the signal input unit and controls the operation of the switching unit. A second control unit receives the output signal of the signal input unit and controls the operation of the path switching unit.

Description

Single Switching Power Audio Amplifier Unifying Power Unit and Amplification Unit

The present invention relates to a single-stage switching power acoustic amplifier integrating a power stage and an amplifier stage. In particular, by integrating the power stage and the amplification stage of an audio amplifier into one amplification stage, the size of the circuit can be reduced to reduce cost and reduce power loss. A single stage switching power acoustic amplifier integrating a power stage and an amplifier stage.

1A to 1C are circuit diagrams illustrating a power supply unit (FIG. 1A), a class A amplifier (FIG. 1B), and a class B amplifier (FIG. 1C) of an audio amplifier according to the prior art, and FIGS. 2A and 2B are related to the related art. Fig. 2A is a circuit diagram showing a power supply section (Fig. 2A) and a class-D amplifier section (Fig. 2B) of the audio amplifier. FIG. 3 is a view illustrating a switching waveform of the class D amplifier shown in FIG. 2B and an output waveform obtained by filtering the same.

The conventional audio amplifier shown in FIG. 1 shows an analog amplifier and includes a power supply unit and an amplifier unit. At this time, the power supply unit (FIG. 1A) uses a linear transformer or a switching type SMPS, and the amplifier uses a class A amplifier (FIG. 1B) or a class B amplifier (FIG. 1C). 2 shows a digital (PWM) amplifier, which is more efficient than an analog amplifier.

However, the conventional audio amplifier having the above configuration has a disadvantage in that the size and weight of the audio amplifier are large because the power supply unit and the amplification unit exist separately. In addition, since the power supply unit and the amplification unit are configured separately, the power consumption is consumed a lot, there is a disadvantage that the efficiency is lowered.

Accordingly, the present invention has been made to solve the above problems, and a first object of the present invention is to integrate a power stage and an amplifier stage of an audio amplifier into a single amplifier stage, thereby reducing the size and weight of the circuit, thereby reducing the cost of the power stage and the amplifier stage. An integrated single stage switching power acoustic amplifier is provided.

In addition, a second object of the present invention is to provide a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage capable of adjusting the output of the amplifier at the turns ratio of the primary and secondary of the transformer.

In addition, it is a third object of the present invention to provide a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage, which not only can greatly reduce power consumption and improve efficiency, but also implement a high efficiency amplifier.

A single stage switching power acoustic amplifier incorporating a power stage and an amplifier stage according to the present invention for achieving the above object comprises: a DC power supply for rectifying and supplying power including AC and DC; A switch unit which receives a DC power from the DC power supply unit and outputs a pulse width modulation (PWM) switching waveform; A transformer for receiving a PWM switching waveform from the switch and boosting and stepping down the PWM switching waveform by a primary and secondary winding ratio; A path switching unit for changing a path of a voltage current according to a volume of an input signal (PWM switching waveform) supplied from the transformer unit; A filter unit which receives a switching waveform (audio signal) from the path switching unit and filters the filtered waveform; A feedback unit for feeding back an audio signal from the filter unit to a signal input unit and correcting a distortion value generated during transmission of an input signal (audio signal); A signal input unit configured to output a signal obtained by comparing and amplifying the audio signal received from the feedback unit and the audio signal received from the outside; A first control unit which receives an output signal of the signal input unit and controls the operation of the switch unit; And a second controller configured to receive an output signal of the signal input unit to control an operation of the path switching unit, to correct a distortion value generated during transmission of the audio signal.

The switch unit may be configured of any one of a fly back, forward, half bridge, push-pull, and full bridge circuit according to an operating method.

The path switching unit is characterized by operating in half-wave driving and full-wave driving according to the configuration of the circuit.

The switch unit may be switched by the first control unit FET gate M1 to make a ground voltage on the primary side of the transformer;

The path switching section includes a FET gate Q1A connected between a node Nd4 and a node Nd5 connected to a first stage on the secondary side of the transformer and driven by a control signal (2) of the second controller; A diode D2 connected between the node Nd5 and a node Nd6; A diode D4 connected between the node Nd6 and the node Nd8; A FET gate Q2A connected between the node Nd8 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by a control signal (4) of the second controller; A diode D3 connected between the node Nd4 and the node Nd12; A FET gate Q3A connected between the node Nd12 and a node Nd11 connected to a ground terminal and driven by a control signal (3) of the second controller; A diode D5 connected between the node Nd9 and a node Nd10; And a FET gate Q4A connected between the node Nd10 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second controller.

The path switching section includes a FET gate Q1A connected between a node Nd4 and a node Nd5 connected to a first stage on the secondary side of the transformer and driven by a control signal (2) of the second controller; A diode D2 connected between the node Nd5 and a node Nd6; A FET gate Q2A connected between the node Nd6 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by a control signal (4) of the second controller; A diode D3 connected between the node Nd4 and the node Nd12; A FET gate Q3A connected between the node Nd12 and a node Nd11 connected to a ground terminal and driven by the control signal 3 of the second controller; And a FET gate Q4A connected between the node Nd9 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second control unit.

The path switching section is connected between a node Nd4 and a node Nd6 connected to a first stage on the secondary side of the transformer and is driven by a control signal (2) of the second control section; A diode D4 connected between the node Nd6 and the node Nd8; A FET gate Q2A connected between the node Nd8 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by a control signal (4) of the second controller; A FET gate Q3A connected between the node Nd4 and a node Nd11 connected to a ground terminal and driven by a control signal (3) of the second controller; A diode D5 connected between the node Nd9 and a node Nd10; And a FET gate Q4A connected between the node Nd10 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second controller.

The path switching section includes a diode D2 connected between a node Nd4 and a node Nd5 connected to a first end on the secondary side of the transformer; A FET gate Q1A connected between the node Nd5 and the node Nd6 and driven by a control signal (2) of the second controller; A FET gate Q2A connected between the node Nd6 and the node Nd8 and driven by the control signal 3 of the second controller; And a diode D3 connected between the node Nd8 and a node Nd9 connected to a third end on the secondary side of the transformer.

The filter unit includes an inductor L1 connected between the node Nd6 and a node Nd7 connected to a first end of the speaker; And a capacitor C2 connected between the node Nd7 and the second terminal of the speaker and connected between the ground terminal.

The switch unit is configured to include a; FET gate M1 which is switched by the first control unit to make the primary side of the transformer to the ground voltage.

The path switching section includes a FET gate Q1A connected between a node Nd4 and a node Nd5 connected to a first stage on the secondary side of the transformer and driven by a control signal (2) of the second controller; A diode D2 connected between the node Nd5 and a node Nd6; A diode D4 connected between the node Nd6 and the node Nd8; A FET gate Q2A connected between the node Nd8 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by a control signal (4) of the second controller; A diode D3 connected between the node Nd4 and the node Nd12; A FET gate Q3A connected between the node Nd12 and a node Nd11 connected to a ground terminal and driven by a control signal (3) of the second controller; A diode D5 connected between the node Nd9 and a node Nd10; And a FET gate Q4A connected between the node Nd10 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second controller.

The path switching section includes a FET gate Q1A connected between a node Nd4 and a node Nd5 connected to a first stage on the secondary side of the transformer and driven by a control signal (2) of the second controller; A diode D2 connected between the node Nd5 and a node Nd6; A FET gate Q2A connected between the node Nd6 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by a control signal (4) of the second controller; A diode D3 connected between the node Nd4 and the node Nd12; A FET gate Q3A connected between the node Nd12 and a node Nd11 connected to a ground terminal and driven by the control signal 3 of the second controller; And a FET gate Q4A connected between the node Nd9 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second controller.

The path switching section is connected between a node Nd4 and a node Nd6 connected to a first stage on the secondary side of the transformer and is driven by a control signal (2) of the second control section; A diode D4 connected between the node Nd6 and the node Nd8; A FET gate Q2A connected between the node Nd8 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by a control signal (4) of the second controller; A FET gate Q3A connected between the node Nd4 and a node Nd11 connected to a ground terminal and driven by a control signal (3) of the second controller; A diode D5 connected between the node Nd9 and a node Nd10; And a FET gate Q4A connected between the node Nd10 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second controller.

The path switching section includes a diode D2 connected between a node Nd4 and a node Nd5 connected to a first end on the secondary side of the transformer; A FET gate Q1A connected between the node Nd5 and the node Nd6 and driven by a control signal (2) of the second controller; A FET gate Q2A connected between the node Nd6 and the node Nd8 and driven by the control signal 3 of the second controller; And a diode D3 connected between the node Nd8 and a node Nd9 connected to a third end on the secondary side of the transformer.

The filter unit includes an inductor L1 connected between the node Nd6 and a node Nd7 connected to a first end of the speaker; And a capacitor C2 connected between the node Nd7 and the second terminal of the speaker and connected between the ground terminal.

And the switch part comprises a diode D1 connected between any one end on the primary side of the transformer and the ground end.

The switch section includes: a FET gate M1 connected between a DC power supply unit and a node Nd2 connected to a first end on a primary side of the transformer and driven by a control signal (1) of the first control section; And a FET gate M2 connected between the node Nd2 and the node Nd3 and driven by the control signal 2 of the first control unit.

The path switching section includes a FET gate Q1A connected between a node Nd4 and a node Nd5 connected to a first stage on the secondary side of the transformer and driven by a control signal (3) of the second controller; A FET gate Q2A connected between the node Nd5 and the node Nd6 and driven by the control signal 4 of the second controller; And a node Nd8 connected between the second end and the ground end on the secondary side of the transformer.

The path switching section includes a FET gate Q1A connected between a node Nd4 and a node Nd5 connected to a first stage on the secondary side of the transformer and driven by a control signal (3) of the second controller; A FET gate Q2A connected between the node Nd5 and the node Nd6 and driven by a control signal (4) of the second controller; A node Nd8 connected between a second end and a ground end on the secondary side of the transformer; A FET gate Q3A connected between a node Nd10 and a node Nd9 connected to a third stage on the secondary side of the transformer and driven by a control signal 5 of the second control unit; And a FET gate Q4A connected between the node Nd9 and the node Nd6 and driven by the control signal 6 of the second control unit.

The path switching section has FET gates Q2A and Q1A connected in series between a node Nd4 and a node Nd5 connected to a first stage on the secondary side of the transformer and driven by control signals (4) (3) of the second control section, respectively; FET gates Q3A and Q4A connected in series between the node Nd5 and a node Nd8 connected to a second end on the secondary side of the transformer and driven by control signals (7) (8) of the second control section, respectively; FET gates Q5A and Q6A connected in series between the node Nd4 and the node Nd7 connected to a ground terminal at the same time as the second terminal of the speaker and driven by the control signals 5 and 6 of the second control unit, respectively; And FET gates Q7A and Q8A connected in series between the node Nd8 and the node Nd7 and driven by the control signals 9 and 10 of the second control unit, respectively.

The filter unit comprises an inductor L1 connected between an output node of the path switching unit and a first terminal of the speaker; And a capacitor C3 connected between the first terminal of the speaker and the second terminal of the speaker connected to the ground terminal.

The switch unit is characterized in that it further comprises a capacitor between the node Nd1 and the second stage on the primary side of the transformer.

The switch unit includes a capacitor C1 connected between one terminal of the FET gate M1 and the node Nd1; And a capacitor C2 connected between the node Nd1 and the node Nd3 connected to the ground terminal.

The switch section includes: a FET gate M1 connected between a node Nd1 connected to a first end on the primary side of the transformer and a node Nd2 connected to a ground end and driven by a control signal (1) of the first control unit; And a FET gate M2 connected between the node Nd4 and the node Nd2 connected to the third stage on the primary side of the transformer and driven by the control signal 2 of the first control unit.

The path switching section includes: FET gates Q1A and Q2A connected in series between a node Nd5 and a node Nd6 connected to a first stage on the secondary side of the transformer and driven by control signals (3) (4) of the second control unit, respectively; And a node Nd8 connected between the second end and the ground end on the secondary side of the transformer.

The path switching section has FET gates Q1A and Q2A connected in series between a node Nd5 and a node Nd6 connected to a first end on the secondary side of the transformer and driven by control signals (3) (4) of the second control section, respectively; A node Nd8 connected between a second end and a ground end on the secondary side of the transformer; And FET gates Q3A and Q4A connected in series between a node Nd9 and a node Nd6 connected to a third stage on the secondary side of the transformer and driven by control signals 5 and 6 of the second control unit, respectively. It is characterized by.

The path switching part is connected in series between a node Nd5 and a node Nd6 connected to the first stage on the secondary side of the transformer and is respectively driven by FET gates Q2A and Q1A driven by control signals 4 and 3 of the second control unit. ; FET gates Q3A and Q4A connected in series between the node Nd6 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by control signals (7) (8) of the second control section, respectively; FET gates Q5A and Q6A connected in series between the node Nd5 and the node Nd8 connected to the ground terminal at the same time as the second terminal of the speaker and driven by the control signals 5 and 6 of the second control unit, respectively; And FET gates Q7A and Q8A connected in series between the node Nd9 and the node Nd8 and driven by the control signals 9 and 10 of the second control unit, respectively.

The filter unit comprises an inductor L1 connected between an output node of the path switching unit and a first terminal of the speaker; And a capacitor C3 connected between the first terminal of the speaker and the second terminal of the speaker connected to the ground terminal.

The switch section comprises: a FET gate M1 connected between a node Nd1 and a node Nd2 connected to a first end on the primary side of the transformer and driven by a control signal (1) of the first controller; A FET gate M2 connected between the node Nd2 and the node Nd3 and driven by a control signal (2) of the first controller; A FET gate M3 connected between the node Nd1 and a node Nd4 connected to a second end on the primary side of the transformer and driven by a control signal (3) of the first controller; And a FET gate M4 connected between the node Nd4 and the node Nd3 and driven by the control signal 4 of the first control unit.

The path switching section includes FET gates Q1A and Q2A connected in series between a node Nd5 and a node Nd6 connected to a first stage on the secondary side of the transformer and driven by control signals (5) (6) of the second control unit, respectively; And a node Nd8 connected between the second end and the ground end on the secondary side of the transformer.

The path switching section includes: FET gates Q1A and Q2A connected in series between a node Nd5 and a node Nd6 connected to a first stage on the secondary side of the transformer and driven by control signals 5 and 6 of the second control unit, respectively; And FET gates Q3A and Q4A connected in series between a node Nd9 and a node Nd6 connected to a third stage on the secondary side of the transformer and driven by control signals 7 and 8 of the second control unit, respectively. It features.

The path switching section includes FET gates Q2A and Q1A connected in series between a node Nd5 and a node Nd6 connected to a first stage on the secondary side of the transformer and driven by control signals (6) (5) of the second control section, respectively; FET gates Q3A and Q4A connected in series between the node Nd6 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by control signals 9 and 10 of the second control unit, respectively; FET gates Q5A and Q6A connected in series between the node Nd5 and the node Nd8 connected to the second terminal of the speaker and connected to the ground terminal, respectively, and driven by control signals (7) (8) of the second controller; And FET gates Q7A and Q8A connected in series between the node Nd9 and the node Nd8 and driven by the control signals 11 and 12 of the second control unit, respectively.

The switch unit is characterized in that it further comprises a capacitor between the node Nd4 and the second stage on the primary side of the transformer.

The filter unit comprises an inductor L1 connected between an output node of the path switching unit and a first terminal of the speaker; And a capacitor C3 connected between the first terminal of the speaker and the second terminal of the speaker connected to the ground terminal.

According to the single-stage switching power acoustic amplifier integrating the power stage and the amplifier stage according to the present invention, by integrating the power stage and the amplifier stage of the audio amplifier into one amplifier stage, the size and weight of the circuit can be greatly reduced, and the power consumption can be reduced. It is possible to realize a high efficiency amplifier by greatly reducing the power consumption.

In other words, by combining the power supply unit and the amplification unit into one, 20 to 50% of the set efficiency of the existing analog audio amplifier (Class A or A / B class) or 70 to 80% of the set efficiency of the digital amplifier can be realized.

In addition, the heat generated from each of the power supply unit and the amplifier unit can be reduced, as well as the size, weight, and power consumption of the entire system can be greatly reduced.

In addition, there is an advantage that the output of the amplifier can be adjusted by the ratio of the primary and secondary turns of the transformer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Power stage Amplification stage  Integrated Single-ended  Switching power acoustic amplifier

4 is a block diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to the present invention.

As shown in FIG. 4, the single stage switching power acoustic amplifier integrating the power stage and the amplifier stage according to the present invention includes a DC power supply unit 10, a switch unit 20, a transformer unit 30, a path switching unit 40, Including the filter unit 50, the speaker 60, the audio signal 70, the signal input unit (or error amplifier) 80, the first control unit 90, the second control unit 100 and the feedback unit 110 Configure.

First, an audio signal is transmitted from the signal input unit 80 that receives an audio signal to the first and second control units 90 and 100, and the audio signal received from the first control unit 90 is converted into a PWM signal. The switch drives the switch 20.

The switch unit 20 receives DC power from the DC power supply unit 10 according to the signal received from the first control unit 90 and converts a pulse width modulation (PWM) switching waveform into the transformer unit 30. ) In this case, the DC power supply unit 10 is supplied from an AC power source or a DC or other power source, rectified by DC and supplied to the switch unit 20. The switch unit 20 may be configured of any one of a flyback, a forward, a half bridge, a push-pull, and a full bridge circuit according to an operation method, and a modified circuit may be considered.

The transformer unit 30 receives the PWM switching waveform from the switch unit 20 and outputs the boosted and stepped-down PWM switching waveform to the path switching unit 40. In this case, the transformer 30 may variously determine the intensity of the output signal by the primary and secondary winding ratios.

The path switching unit 40 functions to change the path of the voltage current according to the polarity of the input signal switching signal (PWM switching waveform) received from the transformer 30. The path switching unit 40 operates in half-wave driving and full-wave driving according to the circuit configuration. It is also necessary to reproduce the AC signal that the acoustic signal generally has from the primary power supply and to reset the magnetization current of the transformer winding.

The audio signal output from the path switching unit 40 is output to the speaker 60 via the filter unit 50. In this case, the filter unit 50 receives the switching waveform (audio signal) from the path switching unit 40 and filters the output signal to the speaker 60.

The signal input unit 80 outputs a signal obtained by comparing and amplifying the audio signal received from the feedback unit 110 and the audio signal received from the outside.

The first controller 90 converts an audio signal received from the signal input unit 80 into a PWM signal to drive the switch unit. In addition, the second controller 100 controls the operation of the path switching unit 40 with the polarity of the audio signal received from the signal input unit 80.

The feedback unit 110 feeds back an audio signal from the filter unit 50 to the signal input unit 80 to correct a distortion value generated during transmission of the input signal (audio signal).

On the other hand, the distortion generated during the transmission of the audio signal input to the signal input unit 80 is fed back to the signal input unit 80 through the feedback unit 110 to correct the distortion value generated during signal amplification.

First embodiment

FIG. 5 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a first embodiment of the present invention. In the configuration of FIG. 4, the switch unit 20, the transformer unit 30, and the path The switching unit 40 and the filter unit 50 are shown in a circuit.

The switch unit 20 includes a diode D1 connected between a node Nd1 connected to the first end on the primary side of the transformer 30 and a ground terminal, and a node connected to the second end on the primary side of the transformer 30. The control signal 1 of the first control unit 90 connected between the capacitor C1 connected between Nd2 and the ground terminal and the node Nd3 connected to the third terminal on the primary side of the transformer 30 and the ground terminal. It comprises a FET gate M1 driven by. The switch unit 20 having the above configuration has a structure similar to a forward converter used in a switched mode power supply, and may be applied in a modified form such as a reset circuit.

The path switching unit 40 is connected between a node Nd4 and a node Nd5 connected to the first stage on the secondary side of the transformer 30 and is driven by the control signal 2 of the second control unit 100. A diode D2 connected between a gate Q1A, the node Nd5 and a node Nd6, a diode D4 connected between the node Nd6 and a node Nd8, and a second terminal on the secondary side of the node Nd8 and the transformer 30; A FET gate Q2A connected between the node Nd9 and driven by the control signal 4 of the second controller 100, a diode D3 connected between the node Nd4 and the node Nd12, and connected to the node Nd12 and the ground terminal. A FET gate Q3A connected between the node Nd11 and driven by the control signal 3 of the second control unit 100, a diode D5 connected between the node Nd9 and the node Nd10, and connected to the node Nd10 and the ground terminal. Connected between nodes Nd11 It is configured to include the FET gate Q4A driven by a control signal (5) of the second group the control unit 100.

The filter unit 50 is connected to the inductor L1 connected between the node Nd6 and the node Nd7 connected to the first end of the speaker 60, and connected to the node Nd7 and the second end of the speaker 60 and grounded. The capacitor C2 is connected between the node Nd11 connected to the stage.

The operation of the single stage switching power acoustic amplifier integrating the power stage and the amplifier stage according to the first embodiment having the above configuration is as follows.

First, the first controller (see 90 of FIG. 4) is converted into a PWM waveform according to an audio input signal to drive the FET gate M1. When the FET gate M1 repeats ON / OFF, a switching waveform is transmitted to the path switching unit 40 in proportion to the primary and secondary winding ratios of the transformer unit 30. When the FET gate M1 is ON, the secondary side point (hereinafter, referred to as 'phase') of the transformer unit 30 becomes positive (+), and when the FET gate M1 is OFF, the transformer unit ( The secondary side of 30) becomes negative (-).

In order for the positive audio waveform to be delivered to the speaker 60 (the + interval of the audio waveform), the secondary side of the transformer 30 must be in a positive state when the FET gate M1 is ON. In this section, the FET gate Q1A and the FET gate Q4A are turned on, and the FET gate Q2A and the FET gate Q3A are turned off. Accordingly, the plus audio waveform output to the first stage on the secondary side of the transformer 30 passes through the FET gate Q1A, through the diode D2, through the inductor L1, through the speaker 60, and through the FET gate Q4A. The current path is formed by inputting the second stage of the transformer side 30 through D5.

If the FET gate is in an ON state, it is a short state and if it is an OFF state, it is an open state.

On the other hand, in order to transmit a negative (-) audio waveform to the speaker 60 (-section of the audio waveform), the secondary phase of the transformer 30 is negative when the FET gate M1 is ON. It must be in condition. In this section, the FET gate Q1A and the FET gate Q4A are turned off, and the FET gate Q2A and the FET gate Q3A are turned on. Accordingly, the negative audio waveform output to the second stage on the secondary side of the transformer 30 passes through the diode D3, the FET gate Q3A through the speaker 60, through the inductor L1, and through the diode D4. The current path is formed by passing through the FET gate Q2A to the secondary side first stage of the transformer unit 30. This equivalent circuit is shown in Figure 6b.

In this driving method, the path switching unit 40 operates only when the FET gate M1 of the switch unit 20 is turned on, and thus, both the switch unit 20 and the path switching unit 40 are half-wave driven. That's the way.

Second embodiment

7 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a second embodiment of the present invention.

The single stage switching power acoustic amplifier incorporating the power stage and the amplifying stage of the second embodiment shown in FIG. 7 is a diagram of the first embodiment shown in FIG. 5 without the diodes D4 and D5 of the path switching unit 40. . At this time, the configuration of the switch unit 20, the transformer 30 and the filter unit 50 is the same as FIG.

That is, the path switching unit 40 is connected between the node Nd4 and the node Nd5 connected to the first stage on the secondary side of the transformer as shown in FIG. 7 and by the control signal 2 of the second control unit. A control signal of the second control unit connected between the driven FET gate Q1A, the diode D2 connected between the node Nd5 and the node Nd6, and the node Nd9 connected to the node Nd6 and the second stage on the secondary side of the transformer. FET gate Q2A driven by 4), diode D3 connected between node Nd4 and node Nd12, and node Nd11 connected to node Nd12 and ground terminal and connected to control signal 3 of the second control unit. And a FET gate Q4A connected between the node Nd9 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second controller.

The operation and current path of the single stage switching power acoustic amplifier integrating the power stage and the amplifier stage according to the second embodiment having the above-described configuration are the same as those of the first embodiment.

Third embodiment

8 is a circuit diagram of a single stage switching power acoustic amplifier incorporating a power stage and an amplifier stage according to a third embodiment of the present invention.

The single stage switching power acoustic amplifier incorporating the power stage and the amplifying stage of the third embodiment shown in FIG. 8 is a diagram of the first embodiment shown in FIG. 5 without the diodes D2 and D3 of the path switching unit 40. . At this time, the configuration of the switch unit 20, the transformer 30 and the filter unit 50 is the same as FIG.

The path switching unit 40 is connected between the node Nd4 and the node Nd6 connected to the first stage on the secondary side of the transformer as shown in FIG. 8 and driven by the control signal 2 of the second control unit. A control signal (4) of the second control unit connected between a FET gate Q1A and a diode D4 connected between the node Nd6 and the node Nd8, and a node Nd9 connected to the node Nd8 and a second stage on the secondary side of the transformer. FET gate Q2A driven by the FET gate Q3A connected between the node Nd4 and the node Nd11 connected to the ground terminal and driven by the control signal 3 of the second controller, and between the node Nd9 and node Nd10. And a FET gate Q4A connected between the diode D5 connected to the node Nd10 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second controller.

The operation and current path of the single stage switching power acoustic amplifier incorporating the power stage and the amplification stage according to the third embodiment having the above configuration are the same as those of the first embodiment.

Fourth embodiment

FIG. 9 is a circuit diagram of a single stage switching power amplifier incorporating a power stage and an amplifier stage according to a fourth embodiment of the present invention. The switch unit 20, the transformer unit 30, the path switching unit 40, and the filter unit It comprises a 50 and the speaker 60.

The switch unit 20 includes a diode D1 connected between a node Nd1 connected to the first end on the primary side of the transformer 30 and a ground terminal, and a node connected to the second end on the primary side of the transformer 30. Control signal 1 of the first control unit 90 connected between the capacitor C1 connected between Nd2 and the ground terminal and the node Nd3 connected to the third stage on the primary side of the transformer 30 and the ground terminal. It comprises a FET gate M1 driven by.

The path switching unit 40 is connected between the node Dd4 and the node Nd5 connected to the first end on the secondary side of the transformer 30 and the node Nd5 and the node Nd6 and the second control unit. A FET gate Q1A driven by the control signal 2 of (100), and a FET gate Q2A connected between the node Nd6 and the node Nd8 and driven by the control signal 3 of the second controller 100; And a diode D3 connected between the node Nd8 and a node Nd9 connected to a third end on the secondary side of the transformer 30.

The filter unit 50 is connected to an inductor L1 connected between the node Nd6 and a node Nd7 connected to a first end of the speaker 60, and connected to the node Nd7 and a second end of the speaker 60. And a capacitor C2 connected between the nodes Nd10 connected to the second stage on the secondary side of the transformer 30.

The operation of the single stage switching power acoustic amplifier integrating the power stage and the amplifier stage according to the fourth embodiment having the above configuration is as follows.

First, the first controller (see 90 of FIG. 4) is converted into a PWM waveform according to an audio input signal to drive the FET gate M1. When the FET gate M1 repeats ON / OFF, a switching waveform is transmitted to the path switching unit 40 in proportion to the primary and secondary winding ratios of the transformer unit 30. When the FET gate M1 is ON, the secondary side point (hereinafter, referred to as 'phase') of the transformer unit 30 becomes positive (+), and when the FET gate M1 is OFF, the transformer unit ( The secondary side of 30) becomes negative (-).

In order for the positive audio waveform to be delivered to the speaker 60 (the + interval of the audio waveform), the secondary side of the transformer 30 must be in a positive state when the FET gate M1 is ON. In this section, the FET gate Q1A is turned on and the FET gate Q2A is turned off. Accordingly, the positive audio waveform output to the first stage on the secondary side of the transformer 30 is passed through the inductor L1 through the diode D2 and the FET gate Q1A, and then through the speaker 60 of the transformer 30. The current path is formed by inputting to the secondary second stage.

In addition, in order to transmit a negative audio waveform to the speaker 60 (-section of the audio waveform), the secondary phase of the transformer 30 is negative when the FET gate M1 is ON. It must be in condition. In this section, the FET gate Q1A is turned off and the FET gate Q2A is turned on. Accordingly, the negative audio waveform output to the second stage on the secondary side of the transformer 30 passes through the inductor L1 through the speaker 60 along the node Nd10 and through the FET gate Q2A and the diode D3. The current path is formed by inputting to the third stage on the secondary side of the transformer section 30.

Fifth Embodiment

10 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a fifth embodiment of the present invention. The switch unit 20, the transformer unit 30, the path switching unit 40, and the filter unit It comprises a 50 and the speaker 60. FIG.

The switch unit 20 includes a capacitor C1 connected between a node Nd1 connected to a first end on the primary side of the transformer 30 and a ground terminal, and a node connected to the node Nd1 and a second end on the primary side of the transformer. And a capacitor C3 and a diode D1 connected in series between Nd2, and a FET gate M1 connected between the node Nd2 and the node Nd3 connected to the ground terminal and driven by the control signal 1 of the first controller. .

The path switching unit 40 is connected between the node Nd4 and the node Nd5 connected to the first stage on the secondary side of the transformer and is driven by the control signal 2 of the second control unit and the node Nd5. And a second controller connected between the diode D2 connected between the node Nd6, the diode D4 connected between the node Nd6 and the node Nd8, and the node Nd9 connected to the node Nd8 and the second end on the secondary side of the transformer. The control signal of the second controller is connected between the FET gate Q2A driven by the control signal 4 of the node, the diode D3 connected between the node Nd4 and the node Nd12, and the node Nd11 connected to the node Nd12 and the ground terminal. The FET gate Q3A driven by (3), the diode D5 connected between the node Nd9 and the node Nd10, and the node Nd11 connected to the node Nd10 and the ground terminal, The FET gate Q4A driven by the control signal 5 is included.

The filter unit 50 includes an inductor L1 connected between the node Nd6 and a node Nd7 connected to the first end of the speaker, and a node Nd11 connected to the node Nd7 and the second end of the speaker and connected to a ground terminal. It comprises a capacitor C2 connected to.

The operation of the single stage switching power acoustic amplifier integrating the power stage and the amplifier stage according to the fifth embodiment having the above configuration is as follows.

First, the first controller (see 90 of FIG. 4) is converted into a PWM waveform according to an audio input signal to drive the FET gate M1. When the FET gate M1 repeats ON / OFF, a switching waveform is transmitted to the path switching unit 40 in proportion to the primary and secondary winding ratios of the transformer unit 30. When the FET gate M1 is ON, the secondary side point (hereinafter, referred to as 'phase') of the transformer unit 30 becomes negative (-), and when the FET gate M1 is OFF, the transformer unit ( The secondary phase of 30) becomes positive (+).

That is, the switch unit 20 operates in half-wave driving, but the flyback method transfers energy to the transformer unit 30 when the FET gate M1 is turned off. Accordingly, the path switching unit 40 operates when the FET gate M1 is in an OFF state. The switch unit 20 can add a snubber circuit can be applied in various forms.

In order for the positive audio waveform to be delivered to the speaker 60 (the + interval of the audio waveform), the secondary side of the transformer 30 must be in the positive state when the FET gate M1 is OFF. In this section, the FET gate Q1A and the FET gate Q4A are turned on, and the FET gate Q2A and the FET gate Q3A are turned off. Accordingly, the plus audio waveform output to the first stage on the secondary side of the transformer 30 passes through the FET gate Q1A, through the diode D2, through the inductor L1, through the speaker 60, and through the FET gate Q4A. The current path is formed by inputting the second stage of the transformer side 30 through D5.

On the other hand, in order to transmit a negative (-) audio waveform to the speaker 60 (-section of the audio waveform), the secondary phase of the transformer 30 is negative when the FET gate M1 is OFF. It must be in condition. In this section, the FET gate Q1A and the FET gate Q4A are turned off, and the FET gate Q2A and the FET gate Q3A are turned on. Accordingly, the negative audio waveform output to the second stage on the secondary side of the transformer 30 passes through the diode D3, the FET gate Q3A through the speaker 60, through the inductor L1, and through the diode D4. The current path is formed by passing through the FET gate Q2A to the secondary side first stage of the transformer unit 30.

In this driving method, the path switching unit 40 operates only when the FET gate M1 of the switch unit 20 is turned off. Thus, both the switch unit 20 and the path switching unit 40 are half-wave driven. That's the way.

Sixth embodiment

FIG. 11 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a sixth preferred embodiment of the present invention.

The single stage switching power acoustic amplifier incorporating the power stage and the amplifying stage of the sixth embodiment illustrated in FIG. 11 is a diagram of the fifth embodiment shown in FIG. 10 without the diodes D4 and D5 of the path switching unit 40. . At this time, the configuration of the switch unit 20, the transformer 30 and the filter unit 50 is the same as FIG.

That is, the path switching unit 40 is connected between the node Nd4 and the node Nd5 connected to the first stage on the secondary side of the transformer as shown in FIG. 11 and by the control signal 2 of the second control unit. A control signal of the second control unit connected between the driven FET gate Q1A, the diode D2 connected between the node Nd5 and the node Nd6, and the node Nd9 connected to the node Nd6 and the second stage on the secondary side of the transformer. FET gate Q2A driven by 4), diode D3 connected between node Nd4 and node Nd12, and node Nd11 connected to node Nd12 and ground terminal and connected to control signal 3 of the second control unit. And a FET gate Q4A connected between the node Nd9 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second controller.

The operation and current path of the single stage switching power acoustic amplifier integrating the power stage and the amplifier stage according to the eleventh embodiment having the above-described configuration are the same as in the tenth embodiment.

Seventh embodiment

12 is a circuit diagram of a single stage switching power amplifier incorporating a power stage and an amplifier stage according to a seventh preferred embodiment of the present invention.

The single stage switching power acoustic amplifier incorporating the power stage and the amplifying stage of the seventh embodiment shown in FIG. 12 is a diagram of the fifth embodiment shown in FIG. 10 without the diodes D2 and D3 of the path switching unit 40. . At this time, the configuration of the switch unit 20, the transformer 30 and the filter unit 50 is the same as FIG.

The path switching unit 40 is connected between the node Nd4 and the node Nd6 connected to the first stage on the secondary side of the transformer as shown in FIG. 12 and driven by the control signal 2 of the second control unit. A control signal (4) of the second control part connected between a FET gate Q1A and a diode D4 connected between the node Nd6 and the node Nd8 and a node Nd9 connected to the node Nd8 and a second stage on the secondary side of the transformer. A FET gate Q2A driven by the FET gate Q3A connected between the node Nd4 and the node Nd11 connected to the ground terminal and driven by the control signal 3 of the second controller, and between the node Nd9 and the node Nd10. And a FET gate Q4A connected between the connected diode D5 and the node Nd10 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second control unit.

The operation and current path of the single stage switching power acoustic amplifier integrating the power stage and the amplification stage according to the seventh embodiment having the above configuration are the same as in the fifth embodiment.

Eighth embodiment

13 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to an eighth preferred embodiment of the present invention.

The switch unit 20 in the eighth embodiment includes a capacitor C1 connected between the node Nd1 connected to the first end on the primary side of the transformer 30 and a ground terminal, and the node Nd1 on the primary side of the transformer. FET gate connected between the capacitor C3 and the diode D1 connected in series between the node Nd2 connected to the second stage and the node Nd3 connected to the node Nd2 and the ground terminal and driven by the control signal 1 of the first controller. It consists of M1.

The path switching section 40 is connected between a node Dd connected to a node Nd4 and a node Nd5 connected to a first stage on the secondary side of the transformer, and is connected between the node Nd5 and a node Nd6 and controlled by the second control unit. FET gate Q1A driven by signal 2, FET gate Q2A connected between node Nd6 and node Nd8 and driven by control signal 3 of the second controller, node Nd8 and two of the transformer. And a diode D3 connected between the nodes Nd9 connected to the third end on the vehicle side.

The filter part 50 is connected to the inductor L1 connected between the node Nd6 and the node Nd7 connected to the first end of the speaker, and the second on the secondary side of the transformer connected to the node Nd7 and the second end of the speaker. The capacitor C2 is connected between the nodes Nd10 connected to the stage.

The operation of the single stage switching power acoustic amplifier integrating the power stage and the amplifier stage according to the eighth embodiment having the above configuration is as follows.

First, the first controller (see 90 of FIG. 4) is converted into a PWM waveform according to an audio input signal to drive the FET gate M1. When the FET gate M1 repeats ON / OFF, a switching waveform is transmitted to the path switching unit 40 in proportion to the primary and secondary winding ratios of the transformer unit 30. When the FET gate M1 is ON, the secondary side point (hereinafter, referred to as 'phase') of the transformer unit 30 becomes negative (-), and when the FET gate M1 is OFF, the transformer unit ( The secondary phase of 30) becomes positive (+).

In order for the positive audio waveform to be delivered to the speaker 60 (the + interval of the audio waveform), the secondary side of the transformer 30 must be in the positive state when the FET gate M1 is OFF. In this section, the FET gate Q1A is turned on and the FET gate Q2A is turned off. Accordingly, the positive audio waveform output to the first stage on the secondary side of the transformer 30 is passed through the inductor L1 through the diode D2 and the FET gate Q1A, and then through the speaker 60 of the transformer 30. The current path is formed by inputting to the secondary second stage.

In addition, in order to transmit a negative audio waveform to the speaker 60 (-section of the audio waveform), the secondary phase of the transformer 30 is negative when the FET gate M1 is ON. It must be in condition. In this section, the FET gate Q1A is turned off and the FET gate Q2A is turned on. Accordingly, the negative audio waveform output to the second stage on the secondary side of the transformer 30 passes through the inductor L1 through the speaker 60 along the node Nd10 and through the FET gate Q2A and the diode D3. The current path is formed by inputting to the third stage on the secondary side of the transformer section 30.

9th embodiment

14 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a ninth preferred embodiment of the present invention.

As shown in FIG. 14, the switch unit 20 according to the ninth embodiment has a node Nd2 connected to the first stage on the primary side of the transformer 30 and a second stage on the primary side of the transformer 30. A capacitor FET connected between the node Nd1 connected to the FET gate M1 driven by the control signal 1 of the first control unit 90, and a capacitor C1 connected between one terminal of the FET gate M1 and the node Nd1. A capacitor C2 connected between the node Nd1 and a node Nd3 connected to the ground terminal, and a FET gate M2 connected between the node Nd2 and the node Nd3 and driven by the control signal 2 of the first controller 90. Consists of including.

The path switching unit 40 is connected between the node Nd4 and the node Nd5 connected to the first stage on the secondary side of the transformer 30 and is driven by the control signal 3 of the second control unit 100. FET gate Q2A connected between Q1A, the node Nd5 and the node Nd6 and driven by the control signal 4 of the second control unit 100, and the second and ground terminals on the secondary side of the transformer 30. It comprises the node Nd8 connected between them.

The filter unit 50 is connected to the inductor L1 connected between the node Nd6 and the node Nd7 connected to the first terminal of the speaker 60, and is connected to the second end on the secondary side of the transformer 30 and the speaker ( And a capacitor C3 connected between the second terminal of 60) and the node Nd8 connected to the ground terminal.

The operation of the single stage switching power acoustic amplifier integrating the power stage and the amplifier stage according to the ninth embodiment having the above configuration is as follows.

First, the first controller (see 90 of FIG. 4) is converted into a PWM waveform according to an audio input signal to alternately drive the FET gate M1 and the FET gate M2 ON / OFF. At this time, if the FET gate M1 and the FET gate M2 are alternately turned on / off, the path switching unit 40 is proportional to the primary and secondary winding ratios of the transformer unit 30. The switching waveform is delivered. When the FET gate M1 is ON, the secondary phase of the transformer 30 is positive (+). When the FET gate M2 is ON, the secondary phase of the transformer 30 is negative (−). Becomes

In order for the positive audio waveform to be delivered to the speaker 60 (the + interval of the audio waveform), the secondary side of the transformer 30 must be in a positive state when the FET gate M1 is ON. In this section, the FET gate Q1A and the FET gate Q2A are turned on. Accordingly, the plus audio waveform output to the first stage on the secondary side of the transformer unit 30 passes through the inductor L1 through the FET gates Q1A and Q2A, and then through the speaker 60 through the secondary side of the transformer unit 30. Input to the second stage forms a current path.

In addition, in order to transmit a negative audio waveform to the speaker 60 (-section of the audio waveform), the secondary phase of the transformer 30 is negative when the FET gate M2 is turned on. Should be In this period, the FET gates Q1A and Q2A are both turned on. Accordingly, the negative audio waveform output to the second stage on the secondary side of the transformer unit 30 passes through the node Nd8, through the speaker 60, through the inductor L1, through the FET gates Q2A and Q1A, and then through the transformer unit. Input to the secondary side first stage of 30 to form a current path.

In this driving method, the FET gates M1 and M2 of the switch unit 20 are alternately turned on to operate the path switching unit 40. The switch unit 20 and the path switching unit 40 are operated. All of them are radio wave drive.

10th embodiment

15 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a tenth preferred embodiment of the present invention.

As shown in FIG. 15, the switch unit 20 according to the tenth embodiment has a node Nd2 connected to the first stage on the primary side of the transformer 30 and a second stage on the primary side of the transformer 30. A FET gate M1 connected between the node Nd1 connected to the FET gate M1 driven by the control signal 1 of the first control unit 90, and a capacitor C1 connected between one terminal of the FET gate M1 and the node Nd1; The capacitor C2 connected between the node Nd1 and the node Nd3 connected to the ground terminal, and the FET gate M2 connected between the node Nd2 and the node Nd3 and driven by the control signal 2 of the first controller 90. It is configured to include. The switch unit 20 having the above configuration has a structure similar to that of a half bridge used in a switched mode power supply.

The path switching unit 40 is connected between the node Nd4 and the node Nd5 connected to the first stage on the secondary side of the transformer 30 and is driven by the control signal 3 of the second control unit 100. FET gate Q2A connected between Q1A, the node Nd5 and the node Nd6 and driven by the control signal 4 of the second control unit 100, and the second and ground terminals on the secondary side of the transformer 30. FET gate connected between the node Nd8 connected between the node Nd10 and the node Nd9 connected to the third stage on the secondary side of the transformer 30 and driven by the control signal 5 of the second control unit 100. And a FET gate Q4A connected between Q3A and the node Nd9 and the node Nd6 and driven by the control signal 6 of the second control unit 100.

The filter unit 50 is connected to the inductor L1 connected between the node Nd6 and the node Nd7 connected to the first terminal of the speaker 60, and is connected to the second end on the secondary side of the transformer 30 and the speaker ( And a capacitor C3 connected between the node Nd8 connected to the second terminal of 60).

The operation of the single stage switching power acoustic amplifier integrating the power stage and the amplifier stage according to the tenth embodiment having the above configuration is as follows.

First, the first controller (see 90 of FIG. 4) is converted into a PWM waveform according to an audio input signal to alternately drive the FET gate M1 and the FET gate M2 ON / OFF. In this case, when the FET gate M1 and the FET gate M2 are alternately turned on / off, the path switching unit 40 switches to the path switching unit 40 in proportion to the primary and secondary winding ratios of the transformer unit 30. The waveform is delivered. When the FET gate M1 is ON, the secondary phase of the transformer 30 is positive (+). When the FET gate M2 is ON, the secondary phase of the transformer 30 is negative (−). Becomes

In order for the positive audio waveform to be delivered to the speaker 60 (the + interval of the audio waveform), the secondary side of the transformer 30 must be in a positive state when the FET gate M1 is ON. In this section, the FET gate Q1A and the FET gate Q3A are turned on, and the FET gate Q2A and the FET gate Q4A are turned off. Accordingly, the plus audio waveform output to the first stage on the secondary side of the transformer 30 passes through the inductor L1 through the internal diode of the FET gate Q2A which is turned off after the FET gate Q1A, and then through the speaker 60. ) Is input to the secondary second stage of the transformer unit 30 to form a current path.

In addition, when the FET gate M2 of the switch unit 20 is turned on so that the secondary phase of the transformer unit 30 becomes negative, the FET gate Q3A is turned on to pass through the FET gate Q3A and turn off. A current path is formed toward the secondary side of the transformer unit 30 through the inductor L1 via the internal diode of the FET gate Q4A and through the speaker 60.

When the FET gate is in an ON state, it is a short state, and when it is in an OFF state, it is an open state.

On the other hand, if a negative (-) audio waveform is to be transmitted to the speaker 60 (-section of the audio waveform), the secondary phase of the transformer 30 is positive (+) when the FET gate M1 is turned on. Should be In this section, the FET gate Q1A and the FET gate Q3A are turned off, and the FET gate Q2A and the FET gate Q4A are turned on. Accordingly, the negative audio waveform output to the second stage on the secondary side of the transformer 30 passes through the node Nd8, through the speaker 60, through the inductor L1, and passes through the FET gate Q4A which is turned on. A current path is formed by being input to the third side of the secondary side of the transformer unit 30 via an internal diode of the FET gate Q3A which is turned off.

In addition, when the FET gate M2 of the switch unit 20 is turned on so that the secondary phase of the transformer unit 30 becomes negative, the speaker 60 at the second stage on the secondary side of the transformer unit 30 is negative. A current path is formed through the inductor L1 through the FET gate Q2A turned on, through the internal diode of the FET gate Q1A turned off, and to the first stage on the secondary side of the transformer unit 30. . This equivalent circuit is illustrated in FIG. 16B.

In this driving method, the FET gates M1 and M2 of the switch unit 20 are alternately turned on to operate the path switching unit 40. The switch unit 20 and the path switching unit 40 are operated. All of them are radio wave drive.

Eleventh embodiment

FIG. 17 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to an eleventh preferred embodiment of the present invention.

As shown in FIG. 17, the switch unit 20 according to the eleventh embodiment includes the node Nd2 connected to the first stage on the primary side of the transformer 30 and the second stage on the primary side of the transformer 30. A FET gate M1 connected between the node Nd1 connected to the FET gate M1 driven by the control signal 1 of the first control unit 90, and a capacitor C1 connected between one terminal of the FET gate M1 and the node Nd1; The capacitor C2 connected between the node Nd1 and the node Nd3 connected to the ground terminal, and the FET gate M2 connected between the node Nd2 and the node Nd3 and driven by the control signal 2 of the first controller 90. It is configured to include.

The path switching section 40 is connected in series between a node Nd4 and a node Nd5 connected to the first stage on the secondary side of the transformer 30 and driven by control signals 4 and 3 of the second control unit, respectively. Connected in series between the FET gates Q2A and Q1A and the node Nd5 connected to the node Nd5 and the second terminal on the secondary side of the transformer 30 and driven by the control signals 7 and 8 of the second controller, respectively. The FET gates Q3A and Q4A and the node Nd4 and the node Nd7 connected to the ground terminal at the same time as the ground terminal and connected in series to the control signals 5 and 6 of the second controller. And FET gates Q5A and Q6A, which are respectively driven in series, and FET gates Q7A and Q8A, which are connected in series between the nodes Nd8 and Nd7 and driven by control signals 9 and 10 of the second control unit, respectively. .

The filter unit 50 includes an inductor L1 connected between the node Nd5 and a node Nd6 connected to the first terminal of the speaker 60, and a capacitor C3 connected between the node Nd6 and the node Nd7. .

The operation of the single stage switching power acoustic amplifier integrating the power stage and the amplifier stage according to the eleventh embodiment having the above configuration is as follows.

First, the first controller (see 90 of FIG. 4) is converted into a PWM waveform according to an audio input signal to alternately drive the FET gate M1 and the FET gate M2 ON / OFF. In this case, when the FET gate M1 and the FET gate M2 are alternately turned on / off, the path switching unit 40 switches to the path switching unit 40 in proportion to the primary and secondary winding ratios of the transformer unit 30. The waveform is delivered. If the FET gate M1 is ON, the secondary phase of the transformer 30 is positive (+). If the FET gate M2 is ON, the secondary phase of the transformer 30 is negative (-). Becomes

In order to transmit a positive audio waveform to the speaker 60 (+ interval of an audio waveform), when the secondary side of the transformer 30 is in a positive state when the FET gate M1 is ON, the FET is positive. Gates Q2A, Q4A, Q6A and Q8A are turned on, and the FET gates Q1A, Q3A, Q5A and Q7A are turned off. Accordingly, the plus audio waveform output to the first stage on the secondary side of the transformer 30 passes the inductor L1 through the internal diode of the FET gate Q1A which is turned off after passing through the FET gate Q2A which is turned on. Pass through the FET gate Q8A in the turn-on state through the speaker 60 and through the internal diode of the FET gate Q7A in the turn-off state to the second side of the transformer 30, the current path is passed. Is formed.

In addition, when the FET gate M2 of the switch unit 20 is turned on and the secondary phase of the transformer unit 30 is negative, the FET gates Q2A, Q4A, Q6A, and Q8A are turned off. FET gates Q1A, Q3A, Q5A and Q7A are turned on. Accordingly, the plus audio waveform output to the first stage on the secondary side of the transformer 30 passes the inductor L1 via the internal diode of the FET gate Q3A which is turned off after passing through the FET gate Q4A which is turned on. Passing through the speaker 60, the FET gate Q6A is turned on, passes through the internal diode of the FET gate Q5A in the turn-off state, and is input to the secondary first stage of the transformer part 30 to pass the current. Is formed.

If the FET gate is in an ON state, it is a short state, and if it is in an OFF state, it is an open state.

On the other hand, if a negative (-) audio waveform is to be transmitted to the speaker 60 (-section of the audio waveform), the secondary phase of the transformer 30 is positive (+) when the FET gate M1 is turned on. ), The FET gates Q2A, Q4A, Q6A, and Q8A are turned on, and the FET gates Q1A, Q3A, Q5A, and Q7A are turned off. Accordingly, the negative audio waveform output to the first stage on the secondary side of the transformer 30 passes through the internal diode of the FET gate Q5A in the turn-off state and passes through the FET gate Q6A in the turn-on state. 60 through the inductor L1 and through the internal diode of the FET gate Q3A which is turned off, through the FET gate Q4A which is turned on, and is input to the second side second stage of the transformer part 30 so that a current path is generated. Is formed.

In addition, when the FET gate M2 of the switch unit 20 is turned on and the secondary phase of the transformer unit 30 is negative, the FET gates Q2A, Q4A, Q6A, and Q8A are turned off. FET gates Q1A, Q3A, Q5A and Q7A are turned on. Accordingly, the plus audio waveform output to the second stage on the secondary side of the transformer 30 passes through the internal diode of the FET gate Q3A in the turn-off state and passes through the FET gate Q4A in the turn-on state to the speaker ( 60 through the inductor L1 and through the internal diode of the FET gate Q1A in the turn-off state and through the FET gate Q2A in the turn-on state to the secondary side first stage of the transformer part 30 to input the current. A pass is formed. This equivalent circuit is illustrated in FIG. 16B.

In this driving method, the FET gates M1 and M2 of the switch unit 20 are alternately turned on to operate the path switching unit 40. The switch unit 20 and the path switching unit 40 are operated. All of them are radio wave drive.

Twelfth embodiment

19 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a twelfth preferred embodiment of the present invention.

As shown in FIG. 19, the switch unit 20 according to the twelfth embodiment is connected between the node Nd1 connected to the first end on the primary side of the transformer 30 and the node Nd2 connected to the ground end. A capacitor C1 connected between the FET gate M1 driven by the control signal 1 of the control unit 1, the node Nd3 connected to the first end on the primary side of the transformer 30, and the node Nd2 connected to the ground end, and And a FET gate M2 connected between the node Nd4 and the node Nd2 connected to the third stage on the primary side of the transformer 30 and driven by the control signal 2 of the second control unit. The switch unit 20 having the above configuration has a structure similar to a push pull method used in a switched mode power supply.

The path switching section 40 is connected in series between the node Nd5 and the node Nd6 connected to the first stage on the secondary side of the transformer 30 and to the control signals 3 and 4 of the second control section 100. And the node Nd8 connected between the FET gates Q1A and Q2A respectively driven by the second stage and the ground terminal on the secondary side of the transformer 30.

The filter unit 50 is connected to the inductor L1 connected between the node Nd6 and the node Nd7 connected to the first terminal of the speaker 60, and is connected to the second end on the secondary side of the transformer 30 and the speaker ( And a capacitor C3 connected between the second terminal of 60) and the node Nd8 connected to the ground terminal.

The operation of the single stage switching power acoustic amplifier integrating the power stage and the amplifier stage according to the twelfth embodiment having the above configuration is as follows.

First, the first controller (see 90 of FIG. 4) is converted into a PWM waveform according to an audio input signal to alternately drive the FET gate M1 and the FET gate M2 ON / OFF. In this case, when the FET gate M1 and the FET gate M2 are alternately turned on / off, the path switching unit 40 switches to the path switching unit 40 in proportion to the primary and secondary winding ratios of the transformer unit 30. The waveform is delivered. When the FET gate M2 is ON, the secondary phase of the transformer 30 is positive (+), and when the FET gate M1 is ON, the secondary phase of the transformer 30 is negative (−). Becomes

The secondary side of the transformer unit 30 is a single winding, and the operation of the path switching unit 40 is the same as that of FIG.

Thirteenth embodiment

20 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a thirteenth preferred embodiment of the present invention.

The switch unit 20 in the thirteenth embodiment has the same configuration and operation as that of the switch unit 20 in FIG. 19 (the twelfth embodiment). In addition, the transformer 30, the path switching unit 40, and the filter unit 50 have the same configuration and operation as in FIG. 15 (the tenth embodiment).

Fourteenth embodiment

21 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a fourteenth preferred embodiment of the present invention.

The switch unit 20 in the fourteenth embodiment has the same configuration and operation as the switch unit 20 of FIG. 19 (the twelfth embodiment). In addition, the path switching unit 40 and the filter unit 50 are the same as the configuration and operation of FIG. 17 (the eleventh embodiment).

15th embodiment

FIG. 22 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a fifteenth preferred embodiment of the present invention.

As shown in FIG. 22, the switch unit 20 according to the fifteenth embodiment includes a capacitor C1 connected between a node Nd1 and a node Nd3 connected to a ground terminal, and one of the node Nd1 and the transformer 30. FET gate M1 connected between the node Nd2 connected to the first stage on the vehicle side and driven by the control signal 1 of the first controller, and between the node Nd2 and the node Nd3 and the control signal of the first controller Connected between the FET gate M2 driven by (2) and the node Nd4 connected to the node Nd1 and the second end on the primary side of the transformer 30 and driven by the control signal 3 of the first control unit. And a FET gate M4 connected between the node Nd4 and the node Nd3 and driven by the control signal 4 of the first control unit.

The path switching unit 40 and the filter unit 50 are the same as the configuration and operation in FIG. 14 (ninth embodiment).

The switch unit 20 is similar to a full bridge method used for a switching mode power supply, and is converted into a PWM waveform by the first control unit (see 90 in FIG. 4) according to an audio input signal, and alternately alternates the FET gates M1 to M4. Drive on / off. At this time, the FET gates M1 and M4 are turned on / off together, and the FET gates M2 and M3 are turned on / off together. When the FET gates M1 and M2 operate, the secondary phase of the transformer unit 30 becomes positive (+), and when the FET gates M3 and M4 operate, the secondary phase of the transformer unit 30 transfers negative. do.

According to the FET operation method of the switch unit 20 is divided into two ways. That is, it may be divided into a PWM adjustment method as shown in FIG. 23A and a phase shift method as shown in FIG. 23B. As such, two FETs are operated in a pair to transmit a switching waveform to the path switching unit 40 in proportion to the primary and secondary winding ratios of the transformer unit 30. In this case, the path switching unit 40 has the same operation as the path switching unit 40 of FIG. 14.

Sixteenth embodiment

24 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a sixteenth preferred embodiment of the present invention.

The switch unit 20 in the sixteenth embodiment has the same configuration and operation as the switch unit 20 of FIG. 22 (fifteenth embodiment), and the path switching unit 40 and the filter unit 50. ) Is the same as the configuration and operation in FIG. 15 (the tenth embodiment).

Seventeenth embodiment

25 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a seventeenth preferred embodiment of the present invention.

The switch unit 20 in the seventeenth embodiment has the same configuration and operation as the switch unit 20 of FIG. 22 (fifteenth embodiment), and the path switching unit 40 and the filter unit 50. ) Is the same as the configuration and operation in Fig. 17 (Twelfth Embodiment).

Fig. 26 is a waveform diagram showing the polarity of the waveform transmitted to the speaker, and shows a positive (+) sine wave and a negative (-) sine wave, respectively.

The present invention is not limited to the above-described embodiments, and various modifications and changes can be made by those skilled in the art, which should be regarded as included in the spirit and scope of the present invention as defined in the appended claims. will be.

1A to 1C are circuit diagrams showing a power supply unit (FIG. 1A), a class A amplifier (FIG. 1B), and a class B amplifier (FIG. 1C) of an audio amplifier according to the prior art.

2A and 2B are circuit diagrams showing a power supply unit (FIG. 2A) and a class-D amplifier unit (FIG. 2B) of an audio amplifier according to the prior art.

FIG. 3 is a view illustrating a switching waveform of the class D amplifier shown in FIG. 2B and an output waveform obtained by filtering the same.

4 is a block diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to the present invention.

5 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a first embodiment of the present invention.

FIG. 6A is an equivalent circuit diagram of a first operating period (+ sine wave current path) of the amplifier shown in FIG.

FIG. 6B is an equivalent circuit diagram of a second operating section (sine wave current path) of the amplifier shown in FIG.

7 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a second embodiment of the present invention.

8 is a circuit diagram of a single stage switching power acoustic amplifier incorporating a power stage and an amplifier stage according to a third embodiment of the present invention.

9 is a circuit diagram of a single stage switching power acoustic amplifier incorporating a power stage and an amplifier stage according to a fourth preferred embodiment of the present invention.

10 is a circuit diagram of a single stage switching power acoustic amplifier incorporating a power stage and an amplifier stage according to a fifth embodiment of the present invention.

11 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a sixth preferred embodiment of the present invention.

12 is a circuit diagram of a single stage switching power amplifier incorporating a power stage and an amplifier stage according to a seventh preferred embodiment of the present invention.

13 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to an eighth preferred embodiment of the present invention.

14 is a circuit diagram of a single stage switching power acoustic amplifier incorporating a power stage and an amplifier stage according to a ninth preferred embodiment of the present invention.

15 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a tenth preferred embodiment of the present invention.

FIG. 16A is an equivalent circuit diagram of a first operating period (+ sine wave current path) of the amplifier shown in FIG. 15.

FIG. 16B is an equivalent circuit diagram of a second operating section (sinusoidal current path) of the amplifier shown in FIG. 15.

17 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to an eleventh preferred embodiment of the present invention.

FIG. 18A is an equivalent circuit diagram of a first operating period (+ sine wave current path) of the amplifier shown in FIG. 17.

FIG. 18B is an equivalent circuit diagram of a second operating section (sine wave current path) of the amplifier shown in FIG. 17. FIG.

19 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a twelfth preferred embodiment of the present invention.

20 is a circuit diagram of a single stage switching power amplifier incorporating a power stage and an amplifier stage according to a thirteenth preferred embodiment of the present invention.

21 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a fourteenth preferred embodiment of the present invention.

22 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a fifteenth preferred embodiment of the present invention.

FIG. 23A is a PWM control waveform diagram of M1 to M4 shown in FIG. 22.

FIG. 23B is a phase shift control waveform diagram of M1 to M4 shown in FIG. 22.

24 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a sixteenth preferred embodiment of the present invention.

25 is a circuit diagram of a single stage switching power acoustic amplifier integrating a power stage and an amplifier stage according to a seventeenth preferred embodiment of the present invention.

Fig. 26 is a waveform diagram showing the polarity of a waveform delivered to a speaker

[Description of Code for Major Parts of Drawing]

10: DC power supply 20: switch

30: transformer 40: path switching unit

50: filter unit 60: speaker

90: first control unit 100: second control unit

70: audio signal

80: signal input unit or error amplifier

110: feedback unit

Claims (34)

A DC power supply unit rectifying and supplying power including AC and DC to DC; A switch unit which receives a DC power from the DC power supply unit and outputs a pulse width modulation (PWM) switching waveform; A transformer for receiving a PWM switching waveform from the switch and boosting and stepping down the PWM switching waveform by a primary and secondary winding ratio; A path switching unit for changing a path of a voltage current according to a volume of an input signal (PWM switching waveform) supplied from the transformer unit; A filter unit which receives a switching waveform (audio signal) from the path switching unit and filters the filtered waveform; A feedback unit for feeding back an audio signal from the filter unit to a signal input unit and correcting a distortion value generated during transmission of an input signal (audio signal); A signal input unit configured to output a signal obtained by comparing and amplifying the audio signal received from the feedback unit and the audio signal received from the outside; A first control unit which receives an output signal of the signal input unit and controls the operation of the switch unit; And And a second controller configured to receive an output signal of the signal input unit and control an operation of the path switching unit. A single stage switching power acoustic amplifier integrating a power stage and an amplifier stage, characterized in that for correcting the distortion value generated during the transmission of the audio signal. The method of claim 1, The switch unit is a single-stage switching power acoustic amplifier integrating a power stage and an amplifier stage, characterized in that consisting of any one of a flyback, forward, half-bridge, push-pull, full-bridge circuit according to the operation method. The method of claim 1, The path switching unit is a single-stage switching power acoustic amplifier integrated with a power stage and an amplifier stage, characterized in that for operating in half-wave drive and full-wave drive according to the configuration of the circuit. The method of claim 1, wherein the switch unit: And a FET gate M1 which is switched by the first control unit to make the primary side of the transformer into a ground voltage. The single stage switching power acoustic amplifier integrating the power stage and the amplification stage. The method of claim 4, wherein the path switching unit: A FET gate Q1A connected between a node Nd4 and a node Nd5 connected to a first end on the secondary side of the transformer and driven by a control signal (2) of the second controller; A diode D2 connected between the node Nd5 and a node Nd6; A diode D4 connected between the node Nd6 and the node Nd8; A FET gate Q2A connected between the node Nd8 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by a control signal (4) of the second controller; A diode D3 connected between the node Nd4 and the node Nd12; A FET gate Q3A connected between the node Nd12 and a node Nd11 connected to a ground terminal and driven by a control signal (3) of the second controller; A diode D5 connected between the node Nd9 and a node Nd10; And A FET gate Q4A connected between the node Nd10 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second control unit; Acoustic amplifier. The method of claim 4, wherein the path switching unit: A FET gate Q1A connected between a node Nd4 and a node Nd5 connected to a first end on the secondary side of the transformer and driven by a control signal (2) of the second controller; A diode D2 connected between the node Nd5 and a node Nd6; A FET gate Q2A connected between the node Nd6 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by a control signal (4) of the second controller; A diode D3 connected between the node Nd4 and the node Nd12; A FET gate Q3A connected between the node Nd12 and a node Nd11 connected to a ground terminal and driven by the control signal 3 of the second controller; And A FET gate Q4A connected between the node Nd9 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second control unit; Acoustic amplifier. The method of claim 4, wherein the path switching unit: A FET gate Q1A connected between a node Nd4 and a node Nd6 connected to a first end on the secondary side of the transformer and driven by a control signal (2) of the second controller; A diode D4 connected between the node Nd6 and the node Nd8; A FET gate Q2A connected between the node Nd8 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by a control signal (4) of the second controller; A FET gate Q3A connected between the node Nd4 and a node Nd11 connected to a ground terminal and driven by a control signal (3) of the second controller; A diode D5 connected between the node Nd9 and a node Nd10; And A FET gate Q4A connected between the node Nd10 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second control unit; Acoustic amplifier. The method of claim 4, wherein the path switching unit: A diode D2 connected between a node Nd4 and a node Nd5 connected to a first end on the secondary side of the transformer; A FET gate Q1A connected between the node Nd5 and the node Nd6 and driven by a control signal (2) of the second controller; A FET gate Q2A connected between the node Nd6 and the node Nd8 and driven by the control signal 3 of the second controller; And And a diode D3 connected between the node Nd8 and a node Nd9 connected to a third stage on the secondary side of the transformer. A single stage switching power acoustic amplifier incorporating a power stage and an amplification stage. 9. The filter unit according to claim 5, wherein the filter unit comprises: An inductor L1 connected between the node Nd6 and a node Nd7 connected to the first end of the speaker; And And a capacitor C2 connected between the node Nd7 and the second terminal of the speaker and connected between the ground terminal. The method of claim 1, wherein the switch unit: And a FET gate M1 which is switched by the first control unit to make the primary side of the transformer into a ground voltage. The single stage switching power acoustic amplifier integrating the power stage and the amplification stage. The method of claim 10, wherein the path switching unit: A FET gate Q1A connected between a node Nd4 and a node Nd5 connected to a first end on the secondary side of the transformer and driven by a control signal (2) of the second controller; A diode D2 connected between the node Nd5 and a node Nd6; A diode D4 connected between the node Nd6 and the node Nd8; A FET gate Q2A connected between the node Nd8 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by a control signal (4) of the second controller; A diode D3 connected between the node Nd4 and the node Nd12; A FET gate Q3A connected between the node Nd12 and a node Nd11 connected to a ground terminal and driven by a control signal (3) of the second controller; A diode D5 connected between the node Nd9 and a node Nd10; And A FET gate Q4A connected between the node Nd10 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second control unit; Acoustic amplifier. The method of claim 10, wherein the path switching unit: A FET gate Q1A connected between a node Nd4 and a node Nd5 connected to a first end on the secondary side of the transformer and driven by a control signal (2) of the second controller; A diode D2 connected between the node Nd5 and a node Nd6; A FET gate Q2A connected between the node Nd6 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by a control signal (4) of the second controller; A diode D3 connected between the node Nd4 and the node Nd12; A FET gate Q3A connected between the node Nd12 and a node Nd11 connected to a ground terminal and driven by the control signal 3 of the second controller; And A FET gate Q4A connected between the node Nd9 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second control unit; Acoustic amplifier. The method of claim 10, wherein the path switching unit: A FET gate Q1A connected between a node Nd4 and a node Nd6 connected to a first end on the secondary side of the transformer and driven by a control signal (2) of the second controller; A diode D4 connected between the node Nd6 and the node Nd8; A FET gate Q2A connected between the node Nd8 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by a control signal (4) of the second controller; A FET gate Q3A connected between the node Nd4 and a node Nd11 connected to a ground terminal and driven by a control signal (3) of the second controller; A diode D5 connected between the node Nd9 and a node Nd10; And A FET gate Q4A connected between the node Nd10 and the node Nd11 connected to the ground terminal and driven by the control signal 5 of the second control unit; Acoustic amplifier. The method of claim 10, wherein the path switching unit: A diode D2 connected between a node Nd4 and a node Nd5 connected to a first end on the secondary side of the transformer; A FET gate Q1A connected between the node Nd5 and the node Nd6 and driven by a control signal (2) of the second controller; A FET gate Q2A connected between the node Nd6 and the node Nd8 and driven by the control signal 3 of the second controller; And And a diode D3 connected between the node Nd8 and a node Nd9 connected to a third stage on the secondary side of the transformer. A single stage switching power acoustic amplifier incorporating a power stage and an amplification stage. The method according to claim 11, wherein the filter portion is: An inductor L1 connected between the node Nd6 and a node Nd7 connected to the first end of the speaker; And And a capacitor C2 connected between the node Nd7 and the second terminal of the speaker and connected between the ground terminal. The single-stage switching power acoustic amplifier integrating the power stage and the amplifier stage. The method of claim 4, wherein the switch unit, And a diode D1 connected between any one end on the primary side of the transformer and a ground end. The single stage switching power acoustic amplifier integrating the power stage and the amplifier stage. The method of claim 1, wherein the switch unit: A FET gate M1 connected between a DC power supply unit and a node Nd2 connected to a first end on a primary side of the transformer and driven by a control signal (1) of the first control unit; And And a FET gate M2 connected between the node Nd2 and the node Nd3 and driven by a control signal (2) of the first control unit. The method of claim 17, wherein the path switching unit: A FET gate Q1A connected between a node Nd4 and a node Nd5 connected to a first end on the secondary side of the transformer and driven by a control signal (3) of the second controller; A FET gate Q2A connected between the node Nd5 and the node Nd6 and driven by the control signal 4 of the second controller; And And a node Nd8 connected between the second stage and the ground terminal on the secondary side of the transformer. A single stage switching power acoustic amplifier incorporating a power stage and an amplifier stage. The method of claim 17, wherein the path switching unit: A FET gate Q1A connected between a node Nd4 and a node Nd5 connected to a first end on the secondary side of the transformer and driven by a control signal (3) of the second controller; A FET gate Q2A connected between the node Nd5 and the node Nd6 and driven by a control signal (4) of the second controller; A node Nd8 connected between a second end and a ground end on the secondary side of the transformer; A FET gate Q3A connected between a node Nd10 and a node Nd9 connected to a third stage on the secondary side of the transformer and driven by a control signal 5 of the second control unit; And And a FET gate Q4A connected between the node Nd9 and the node Nd6 and driven by the control signal (6) of the second control unit. The method of claim 17, wherein the path switching unit: FET gates Q2A and Q1A connected in series between a node Nd4 and a node Nd5 connected to a first end on the secondary side of the transformer and driven by a control signal (4) (3) of the second controller, respectively; FET gates Q3A and Q4A connected in series between the node Nd5 and a node Nd8 connected to a second end on the secondary side of the transformer and driven by control signals (7) (8) of the second control section, respectively; FET gates Q5A and Q6A connected in series between the node Nd4 and the node Nd7 connected to a ground terminal at the same time as the second terminal of the speaker and driven by the control signals 5 and 6 of the second control unit, respectively; And An integrated stage between the node Nd8 and the node Nd7, including FET gates Q7A and Q8A driven by the control signals 9 and 10 of the second control unit, respectively; Once switched power acoustic amplifier. 21. A filter according to any one of claims 18 to 20, wherein the filter part is: An inductor L1 connected between an output node of the path switching unit and a first terminal of the speaker; And And a capacitor C3 connected between the first terminal of the speaker and the second terminal of the speaker connected to the ground terminal. 21. The method of any of claims 18 to 20, wherein the switch section is: And a capacitor is provided between the node Nd1 and a second stage on the primary side of the transformer. The method of claim 22, wherein the switch unit: A capacitor C1 connected between one terminal of the FET gate M1 and the node Nd1; And And a capacitor C2 connected between the node Nd1 and the node Nd3 connected to the ground terminal. A single stage switching power acoustic amplifier incorporating a power stage and an amplifier stage. The method of claim 1, wherein the switch unit: A FET gate M1 connected between a node Nd1 connected to a first end on the primary side of the transformer and a node Nd2 connected to a ground end and driven by a control signal (1) of the first controller; And And a FET gate M2 connected between the node Nd4 and the node Nd2 connected to the third stage on the primary side of the transformer and driven by the control signal 2 of the first control unit. Single Stage Switching Power Acoustic Amplifier The method of claim 24, wherein the path switching unit: FET gates Q1A and Q2A connected in series between a node Nd5 and a node Nd6 connected to a first end on the secondary side of the transformer and driven by a control signal (3) (4) of the second controller, respectively; And And a node Nd8 connected between the second stage and the ground terminal on the secondary side of the transformer. The single stage switching power acoustic amplifier integrating a power stage and an amplifier stage. The method of claim 24, wherein the path switching unit: FET gates Q1A and Q2A connected in series between a node Nd5 and a node Nd6 connected to a first end on the secondary side of the transformer and driven by a control signal (3) (4) of the second controller, respectively; A node Nd8 connected between a second end and a ground end on the secondary side of the transformer; And  And FET gates Q3A and Q4A connected in series between a node Nd9 and a node Nd6 connected to a third stage on the secondary side of the transformer and driven by control signals 5 and 6 of the second control unit, respectively. Single stage switching power acoustic amplifier with integrated power stage and amplifier stage. The method of claim 24, wherein the path switching unit: FET gates Q2A and Q1A connected in series between a node Nd5 and a node Nd6 connected to a first end on the secondary side of the transformer and driven by a control signal (4) (3) of the second controller, respectively; FET gates Q3A and Q4A connected in series between the node Nd6 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by control signals (7) (8) of the second control section, respectively; FET gates Q5A and Q6A connected in series between the node Nd5 and the node Nd8 connected to the ground terminal at the same time as the second terminal of the speaker and driven by the control signals 5 and 6 of the second control unit, respectively; And An integrated stage between the node Nd9 and the node Nd8, including FET gates Q7A and Q8A driven by the control signals 9 and 10 of the second control unit, respectively; Once switched power acoustic amplifier. 28. A filter according to any one of claims 25 to 27 wherein the filter portion is: An inductor L1 connected between an output node of the path switching unit and a first terminal of the speaker; And And a capacitor C3 connected between the first terminal of the speaker and the second terminal of the speaker connected to the ground terminal. The method of claim 1, wherein the switch unit: A FET gate M1 connected between a node Nd1 and a node Nd2 connected to a first end on the primary side of the transformer and driven by a control signal (1) of the first controller; A FET gate M2 connected between the node Nd2 and the node Nd3 and driven by a control signal (2) of the first controller; A FET gate M3 connected between the node Nd1 and a node Nd4 connected to a second end on the primary side of the transformer and driven by a control signal (3) of the first controller; And And a FET gate M4 connected between the node Nd4 and the node Nd3 and driven by the control signal (4) of the first control unit. The method of claim 29, wherein the path switching unit: FET gates Q1A and Q2A connected in series between a node Nd5 and a node Nd6 connected to a first end on the secondary side of the transformer and driven by control signals 5 and 6 of the second control unit, respectively; And And a node Nd8 connected between the second stage and the ground terminal on the secondary side of the transformer. The single stage switching power acoustic amplifier integrating a power stage and an amplifier stage. The method of claim 29, wherein the path switching unit: FET gates Q1A and Q2A connected in series between a node Nd5 and a node Nd6 connected to a first stage on the secondary side of the transformer and driven by control signals 5 and 6 of the second control unit, respectively; And FET gates Q3A and Q4A connected in series between a node Nd9 and a node Nd6 connected to a third stage on the secondary side of the transformer and driven by control signals 7 and 8 of the second control unit, respectively. Single stage switching power acoustic amplifier with integrated power stage and amplifier stage. The method of claim 29, wherein the path switching unit: FET gates Q2A and Q1A connected in series between a node Nd5 and a node Nd6 connected to a first end on the secondary side of the transformer and driven by control signals (6) (5) of the second control section, respectively; FET gates Q3A and Q4A connected in series between the node Nd6 and a node Nd9 connected to a second end on the secondary side of the transformer and driven by control signals 9 and 10 of the second control unit, respectively; FET gates Q5A and Q6A connected in series between the node Nd5 and the node Nd8 connected to the ground terminal at the same time as the second terminal of the speaker and driven by the control signals 7 and 8 of the second control unit, respectively; And An integrated stage between the node Nd9 and the node Nd8, including FET gates Q7A and Q8A driven by the control signals 11 and 12 of the second control unit, respectively; Once switched power acoustic amplifier. 33. The apparatus of any of claims 29 to 32, wherein the switch section is: And a capacitor is further comprised between the node Nd4 and a second stage on the primary side of the transformer. 33. A filter according to any one of claims 30 to 32, wherein the filter part is: An inductor L1 connected between an output node of the path switching unit and a first terminal of the speaker; And And a capacitor C3 connected between the first terminal of the speaker and the second terminal of the speaker connected to the ground terminal.

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