TWI240543B - Apparatus for utilizing power circuit to amplify voice - Google Patents

Abstract

The present invention relates to an apparatus for utilizing a power circuit to amplify voice. The apparatus includes a power circuit and a voice signal processor. The power circuit receives voltage to regulate voltage so as to provide direct current (DC) output voltage. The power circuit includes a feedback stage for performing feedback control to keep stable outputs for the DC output voltage. The voice signal processor receives a voice signal for processing. The characteristic is that the voice signal processor transmits the processing result for the voice signal to the feedback stage in order to change the feedback signal of the feedback stage. The DC output voltage is then changed due to the voice signal, thereby achieving the goal of amplifying the voice signal.

Description

1240543 V. Description of the invention (1) [Technical field to which the invention belongs] This case is a device for sound amplification, especially using feedback control of a switching-mode power circuit to achieve the purpose of sound ^. [Previous Technology] The current common sound amplification device has an architecture consisting of a power supply 10, a sound amplifier 11 and a speaker 12 as shown in the first figure. among them

The power supply 1 is used to receive the AC voltage source V 1 for voltage regulation to provide DC power to the sound amplifier. The sound amplifier receives the sound signal V2 for audio amplification, and the amplified sound signal pushes the remaining sound to play. As can be seen from the description, the conventional sound amplification device must include at least a "its ~ / 乃" / w port w circuit, that is, a power supply circuit and a sound amplification circuit, in order to achieve the basic functions of sound &volume; volume adjustment and output. For For high 2:; :: sound devices, it is necessary to use a power supply with good performance ^ It is necessary to zoom in °°. However, for applications where the sound quality is not high and the cost is reduced, the sound output of Shikou computer 5 J: Rely on the power supply to supply DC power, and then pass the voice: "" to promote the flavor. This customary technology is not only ancient but also low. If it is not improved, it will make the product lack competition: Effect: [Objective of the Invention]; °

The big G's: 'is to establish a kind of sound using the power circuit for two-tone, amplification and adjustment, only a single-stage power :::; ⑶ amplification, ϊ adjustment and output effects. !! By

Page 5 1240543 V. Description of the invention (2) [Summary of the invention] In order to achieve the above purpose, this case proposes a device for sound amplification using a power supply circuit, which includes a power supply circuit that receives a voltage source for voltage stabilization to provide A DC output voltage, the power circuit includes a feedback stage for feedback control to maintain a stable output of the DC output voltage; and a sound signal processing unit that receives a sound signal for processing; : The sound signal processing unit outputs the processing result of the sound signal to the feedback level, thereby changing the feedback signal of the feedback level, so that the DC output voltage changes in response to the sound signal, thereby amplifying the sound signal. The effect. The device for amplifying sound by using a power supply circuit as described above, wherein the power supply circuit may be a switching-mode power circuit. The device for amplifying sound by using a power supply circuit as described, wherein the voltage source may be a DC voltage source. The device for amplifying sound by using a power supply circuit as described above, wherein the power supply circuit further includes a power stage (Power Stage) for converting the DC voltage source into the DC output voltage and communicating with the feedback stage. Form feedback control circuit. The device for amplifying sound by using a power circuit as described above, wherein the voltage source may be an AC voltage source. The device for amplifying sound by using a power supply circuit as described above, wherein the power supply circuit further includes an input stage (I n p u t S t a g e) for filtering and rectifying the AC voltage source into a DC voltage source.

Page 6 1240543 V. Description of the invention (3) The device for amplifying sound by using a power supply circuit as described above, wherein the power supply circuit further includes a power stage for converting the DC voltage source into the DC output Voltage 'and this feedback stage constitute a feedback control circuit. The device for amplifying sound by using a power supply circuit as described above, wherein the sound signal processing unit may include a volume and sound quality processing circuit to perform a sound volume and sound quality processing on the sound signal. [Embodiment]

Please refer to the second figure, which is a schematic diagram of a device for sound amplification using a power circuit according to a preferred embodiment of the present invention. As shown in the figure, the sound amplification device in this case includes a power supply circuit 20 and a sound processing unit 21. The power supply circuit 20 includes an input stage 201 (Input Stage), a power stage 2 0 2 (Power Stage), and a feedback stage 203 (Feedback Stage ). The power circuit 20 can receive the input of the AC voltage source V 1 or the DC voltage source V 3, and the DC voltage source V 3 is directly sent to the power stage 2 0 2 for energy conversion. The AC voltage source v 1 needs to be filtered by the input stage 2 0 1 And rectification is transmitted to the power stage 2 02. The power stage 2 0 2 is responsible for energy conversion, converting a voltage source from V 1 or V 3 into a DC output voltage Vo, and is used to drive the horn 22. Feedback level 203, on the one hand, refers to the DC output voltage Vo, and provides a feedback signal Vf to the power stage 002 to form a feedback control to maintain a stable output of the DC output voltage Vo; on the other hand, the feedback level 203 The receiving sound signal processing unit 21 also processes the output of the sound signal V2, so that the feedback signal Vf is changed in response to the sound signal V2, and then the DC output voltage Vo is also changed in response to the sound signal V2 under feedback control. In order to further detail how the sound amplification device of this case uses a power circuit

Page 7 1240543 V. Description of the invention (4) The sound amplification function is achieved. The power circuit of a switching power supply is described below as another preferred embodiment of the present invention. Please refer to the third figure, which is a schematic diagram of a device for amplifying sound by using a switching power supply according to another preferred embodiment of the present invention. As shown in the figure, the switching power supply 3 0 includes an input stage 3 0 1, a power stage 3 0 2 and a feedback stage 3 0 3 to provide a DC output power source V for feedback control; the sound signal processing unit 3 1 is composed of a transistor Q , Resistor R1 and R2, the sound signal V2 is divided by resistors R1 and R2, driving transistor Q self-feedback stage 3 0 3 Introduced current 1 2 ° Input stage 301 contains EMI filter 3011, AC rectifier filter circuit 3012, EMI The filter 3011 can isolate the conductive electromagnetic noise from the AC current source VI, and the AC rectification filter circuit 3 0 1 2 rectifies the AC current source V1 to a DC power supply to the power stage 3 2. The power stage 302 is composed of a power switch 3021, an isolated high-frequency transformer 3022, an output rectification filter 3 02, a modulation and driving circuit 3024. The modulation and driving circuit 3 0 24 is used to control whether the power switch 3 0 2 1 is turned on. The control method can use pulse width modulation (PWM, Pulse Width Modulation), pulse frequency modulation (PFM, Pulse Width Modulation) Other technologies determine the time and frequency at which the power switch 3 0 2 1 is turned on. Between the switches of the power switch 3 0 21, the rectified v 丨 or DC voltage source V3 can be converted by the energy of the isolated high frequency transformer 3 0 2 2 and the rectification of the output rectifier filter 3 0 2 2 It is converted into a DC output voltage v 0. The feedback stage consists of an optical isolator 3031 and an error amplifier 3032. The DC output voltage Vo is supplied to the error amplifier 3032 via a resistor R3 and a capacitor C1 for reference. When the sound signal processing unit 31 has no sound signal V2 input

Page 8 1240543 V. Description of the invention (5) ', the transistor Q is turned off, so the error amplifier 3 〇 3 2 can obtain the actual DC output voltage V 〇 and compare with the ideal value of the wheel output voltage, the error value is optically isolated The controller 3 0 3 1 provides the feedback signal vf to the modulation and driving circuit 3 〇 2 4, and controls the on time or number of times of the power switch 3 〇 2 丨 by changing the pulse width or frequency to accurately obtain the desired DC Output voltage v0. However, 'this case uses a switching power supply 3 0 for sound amplification, so the sound 彳 § processing unit 31 will have a sound signal v 2 input, so the transistor Q is turned on and the current 12 is introduced from the current II, which makes it flow into the error amplifier The current I 3 of 3 032 is only I 1-I 2 and the feedback signal vf will be affected by the sound signal V2. When the sound signal V2 is large, the current 12 becomes large and 13 becomes small. The error value generated by 3 0 3 2 becomes larger, and the feedback signal Vf will drive the modulation and driving circuit 3 〇 2 4 change the pulse width or frequency to control the power switch 3 0 2 1 to increase the DC output voltage v 〇 •, instead When the sound signal V2 ^ 'the current 12 becomes smaller and 13 becomes larger, so that the error value generated by the error amplifier 3032 becomes smaller' the feedback signal Vf will drive the modulation and driving circuit 30 to 24, and the pulse width Or frequency to control the power switch 3 0 2 1 to reduce the DC output voltage V0. In this way, the DC output voltage Vo will change with the sound signal V2, and the sound amplification effect can be achieved. No additional sound amplifier is needed. $ Can directly drive the speaker 32. In addition, the switch SW can be used to select the output target of the switch-type two source 30. If the sound signal V 2 is input as an amplifier, the switch SW is connected to the HA32; otherwise, it can also be used as a general power supply. The amplification power of the sound amplification device in this case is determined according to the power of the power supply circuit.方面 For power circuit, you can use flyback

1240543 V. Description of the invention (6) (Flyback), forward (F0rward), full bridge (Full Bridge), half bridge (Hali Bridge) and push-pull (Push_Pul 丨) and other circuit topology (Topology) Switching power supplies, or other power supply circuit designs with feedback control are also possible. As for the sound signal processing unit, in addition to the circuits described in the preferred embodiment of the present invention, the design of control functions such as the volume and sound quality of the sound signal can also be added to complete the sound processing function of the sound amplification device of the present case. The device using the power supply circuit for sound amplification in this case can use only a single power supply circuit to achieve the sound amplification function, which not only saves costs, but also makes the circuit design simpler and more efficient. It can be widely used in speakers, computers, etc. Consumer products, electronic information products, and better product competitiveness. The technology disclosed in this case may be implemented by those skilled in the art, and its unprecedented approach is also patentable, and it is necessary to file a patent application in accordance with the law. However, the above-mentioned embodiments are not enough to cover the scope of patents to be protected in this case. Therefore, the scope of application for patents is attached as follows.

Page 10 1240543 Simple explanation of the diagram Explanation: Simple explanation of the diagram] In this case, you can get a deeper understanding by the following diagram and detailed description. First picture: a schematic diagram of a conventional sound amplification device. Figure: A schematic diagram of a sound amplifier using a power circuit in a preferred embodiment of the present case. Figure: The intention of another preferred embodiment of the device using a switching power supply. The second largest device, the third sound amplification picture is not 10 12 20 201 202 202 203 21 ·· 30: 3011 3012 3 0 2: 3 0 2 2 3 0 24 3 0 3: The drawing numbers of the main components are as follows: Mouth eight power supply circuit Input Stage Power Stage Feedback Stage 1 1: Sound amplifier sound signal processing unit Switching power supply: EMI filter: AC rectification filter circuit Power stage: Isolated high frequency Transformer: Modulation and drive circuit feedback stage 22 301 嗦 丨 J Port 8: Input stage 3 0 2 1: Power switch 3 0 2 3: Output rectifier filter 3 0 3 1: Optical isolator

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Claims (1)

1240543 6. Scope of patent application [Scope of patent application] 1. A device for sound amplification using a power supply circuit, including: a power supply circuit that receives a voltage source for voltage stabilization to provide a DC output voltage, the power supply circuit includes a The feedback stage (Feedback Stage) performs feedback control to maintain a stable output of the DC output voltage; and a sound signal processing unit that receives a sound signal for processing; and is characterized by: The sound signal processing unit outputs the processing result of the sound signal to the feedback level, so as to change the feedback signal of the feedback level, so that the DC output voltage changes in response to the sound signal, thereby achieving amplification of the sound signal effect. 2. The device for sound amplification using a power supply circuit as described in item 1 of the scope of the patent application, wherein the power supply circuit may be a switching power supply (Sw i t c h i n g-M o d e P o w e r) circuit. 3. The device for sound amplification using a power supply circuit as described in item 1 of the scope of the patent application, wherein the voltage source may be a DC voltage source. 4. The device for sound amplification using a power supply circuit as described in item 3 of the scope of the patent application, wherein the power supply circuit further includes a power stage for converting the DC voltage source into the DC output voltage, and A feedback control circuit is formed with the feedback stage. 5. The device for sound amplification using a power supply circuit as described in item 1 of the scope of the patent application, wherein the voltage source may be an AC voltage source. 6. The device for sound amplification using a power supply circuit as described in item 5 of the scope of the patent application, wherein the power supply circuit further includes an input stage (Input Page 13 1240543 6. The scope of patent application S t a g e) is used to filter and rectify the AC voltage source into a DC voltage source. 7. The device for sound amplification using a power supply circuit as described in item 6 of the scope of the patent application, wherein the power supply circuit further includes a power stage for converting the DC voltage source into the DC output voltage, and A feedback control circuit is formed with the feedback stage. 8. The device for sound amplification using a power supply circuit as described in item 1 of the scope of the patent application, wherein the sound signal processing unit may include a volume and sound quality processing circuit to perform volume and sound quality processing on the sound signal. Page 14