Output power adjustable circuit

Abstract

The output power adjustable circuit comprises a power device module, a current sampling module, an analog-to-digital conversion module, a bias voltage adjustment control module and a power adjustment input module. The current sampling module is used for sampling a current signal of the power device module; the analog-to-digital conversion module converts the current signal into a digital signal and inputs the digital signal to the bias voltage adjustment control module; and the bias voltage adjustment control module controls the output power of the power device module according to the digital signal input by the analog-to-digital conversion module and the power adjustment control signal of the power adjustment input module. According to the output power adjustable circuit, the output power of the power device can be reduced, so that electric energy is saved, the service life of the power device is prolonged, the service life of the output power adjustable circuit is further prolonged, and the service life of a sound box is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of audio, in particular to an output power adjustable circuit. Background Art

[0002] When users use speakers to play audio files, such as playing music or listening to books, they often do not need the speakers to work at a high volume.

[0003] In the prior art, no matter the sound system is operating at a low volume or a high volume, the power devices of the sound system are all operating at full power.

[0004] However, in actual application, the user's use needs do not require the speaker to be in full power state (i.e. high power output state) at all times. When working at low volume, the power device reaching 1 / 4 power can already meet the low volume output needs.

[0005] The power output circuit of the existing audio system has power devices that are always in full power operation, which causes great waste. Moreover, long-term full power operation greatly shortens the life of the power devices, thereby affecting the service life of the audio system. Utility Model Content

[0006] The purpose of the utility model is to overcome the deficiencies in the prior art and provide an output power adjustable circuit, which can reduce the output power of power devices, thereby saving electric energy and extending the service life of power devices, thereby extending the service life of the output power adjustable circuit and the service life of the audio.

[0007] The purpose of this utility model is achieved through the following technical solutions:

[0008] An output power adjustable circuit comprises: a power device module, a current sampling module, an analog-to-digital conversion module, a bias voltage adjustment control module and a power adjustment input module;

[0009] The current sampling module is used to sample the current signal of the power device module; the analog-to-digital conversion module converts the current signal into a digital signal and inputs it into the bias adjustment control module; the bias adjustment control module controls the output power of the power device module according to the digital signal input by the analog-to-digital conversion module and the power adjustment control signal of the power adjustment input module.

[0010] Preferably, the bias voltage adjustment control module includes a single chip microcomputer and a power conversion control unit;

[0011] The single-chip microcomputer receives the digital signal input by the analog-to-digital conversion module, and also receives the power adjustment control signal of the power adjustment input module; the single-chip microcomputer outputs the power control signal to the power conversion control unit according to the digital signal input by the analog-to-digital conversion module and the power adjustment control signal of the power adjustment input module;

[0012] The power conversion control unit converts the power regulation control signal into a voltage control signal and outputs the signal to the power control terminal of the power device module to control the output power of the power device module.

[0013] Preferably, the bias adjustment control module further includes a remote control receiving unit, which is connected to the single-chip microcomputer; the power adjustment input module includes a remote control transmitting unit;

[0014] The remote control transmitting unit sends a power adjustment control signal to the remote control receiving unit.

[0015] Preferably, the power adjustment input module further comprises a half-power switch unit;

[0016] The half-power switch unit sends a power regulation control signal to the single-chip microcomputer.

[0017] Preferably, the power device module includes a power device, and the power device is an IGBT, a MOSFET, a VMOSFET or an electron tube.

[0018] Preferably, the power device module further includes a first resistor R1; one end of the first resistor R1 is connected to the control end of the power device, and the other end of the first resistor R1 is connected to the output end of the bias adjustment control module.

[0019] Preferably, the power device module further includes a third resistor R3; the third resistor R3 is connected in series between the first resistor R1 and the output end of the bias adjustment control module.

[0020] Preferably, the current sampling module comprises a sampling resistor R2, and the sampling resistor R2 is connected in series to the output end of the power device.

[0021] Preferably, the power device is a KT88 electron tube.

[0022] Compared with the prior art, the utility model has at least the following advantages:

[0023] The output power adjustable circuit of the utility model can enter the half-power mode by one-key through a half-power switch or a remote control transmitter, so that when the user needs a low volume state, the output power adjustable circuit quickly enters the half-power working state, thereby achieving the purpose of power saving, being green and environmentally friendly, and conforming to the general trend.

[0024] Moreover, the output power adjustable circuit of the utility model prolongs the life of power devices and other components by entering a half-power working state. The output power adjustable circuit of the utility model prolongs the life of power devices and other components by 3-6 times. The life extension time varies depending on different power devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 The principle frame of the output power adjustable circuit of the utility model is Figure 1 ;

[0027] Figure 2 The principle frame of the output power adjustable circuit of the utility model is Figure 2 ;

[0028] Figure 3 This is an application principle diagram of the output power adjustable circuit of the utility model. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings show preferred embodiments of the present invention.

[0030] like Figure 1 As shown, the utility model discloses an output power adjustable circuit 10, comprising: a power device module 100, a current sampling module 200, an analog-to-digital conversion module 300, a bias adjustment control module 400, and a power adjustment input module 500.

[0031] Among them, the current sampling module 200 is used to sample the current signal of the power device module 100; the analog-to-digital conversion module 300 converts the current signal into a digital signal and inputs it into the bias adjustment control module 400; the bias adjustment control module 400 controls the output power of the power device module 100 according to the digital signal input by the analog-to-digital conversion module 300 and the power adjustment control signal of the power adjustment input module 500.

[0032] like Figure 2As shown, in this embodiment, the bias adjustment control module includes a single-chip microcomputer 410 and a power conversion control unit 420. The single-chip microcomputer receives the digital signal input by the analog-to-digital conversion module and also receives the power adjustment control signal of the power adjustment input module; the single-chip microcomputer outputs the power control signal to the power conversion control unit according to the digital signal input by the analog-to-digital conversion module and the power adjustment control signal of the power adjustment input module; the power conversion control unit converts the power adjustment control signal into a voltage control signal and outputs it to the power control terminal of the power device module to control the output power of the power device module.

[0033] like Figure 2 As shown, in this embodiment, the bias adjustment control module also includes a remote control receiving unit 430, which is connected to the single-chip microcomputer; the power adjustment input module includes a remote control transmitting unit 600; and the remote control transmitting unit sends a power adjustment control signal to the remote control receiving unit.

[0034] like Figure 2 As shown, in this embodiment, the power adjustment input module further includes a half-power switch unit 700; the half-power switch unit sends a power adjustment control signal to the single-chip microcomputer.

[0035] like Figure 2 and Figure 3 As shown, as a preferred embodiment, the power device module includes a power device, and the power device is an IGBT, a MOSFET, a VMOSFET or an electron tube. In this embodiment, the power device is an electron tube KT88.

[0036] like Figure 2 and Figure 3 As shown, in this embodiment, the power device module further includes a first resistor R1; one end of the first resistor R1 is connected to the control end of the power device, and the other end is connected to the output end of the bias adjustment control module. In this embodiment, the power device module further includes a third resistor R3; the third resistor R3 is connected in series between the first resistor R1 and the output end of the bias adjustment control module.

[0037] like Figure 2 and Figure 3 As shown, in this embodiment, the current sampling module includes a sampling resistor R2, and the sampling resistor R2 is connected in series to the output end of the power device.

[0038] Please also read Figures 1 to 3 , the working principle of the output power adjustable circuit of the utility model is described below:

[0039] The output power adjustable circuit can be pre-set in power saving mode, that is, the half-power current I of the electron tube KT88 in the half-power working state h , and the half-power current I h The corresponding digital signal Sh The storage unit of the single-chip microcomputer IC1, such as in the EEPROM; at the same time, the single-chip microcomputer also stores the corresponding half-power control signal P of the electron tube KT88 under the half-power working state. h , that is, when the electron tube KT88 is in half-power working state, the corresponding half-power control signal P output by the single-chip microcomputer h ;

[0040] When the output power adjustable circuit is started, it enters the full power working state by default. At this time, the electron tube KT88 is in the full power working state, and the power output end of the electron tube KT88 outputs full power to the transformer. At this time, the output power adjustable circuit is in the full power working state, and the sound is in the high volume state.

[0041] When the sound needs to be in a low volume state, the output power adjustable circuit can enter the power saving mode; when entering the power saving mode (half-power state), the user can select the power saving mode with one key through the remote control transmitter (i.e., send a power saving mode entry signal to the remote control receiving unit), and the remote control receiving unit transmits the power saving mode entry signal to the single-chip microcomputer after receiving the power saving mode entry signal; at the same time, the current sampling resistor R2 samples the working current I0 of the electron tube KT88, and the analog-to-digital conversion module converts the working current I0 into a digital signal S0 and inputs it into the single-chip microcomputer; the single-chip microcomputer reads the pre-stored half-power current I h The corresponding digital signal S h , and compare the digital signal S0 corresponding to the working current I0 to determine the current working mode of the output power adjustable circuit. If the output power adjustable circuit is currently in full power mode (digital signal S0 = digital signal S h ), the single chip microcomputer outputs a half-power control signal P to the power conversion control unit h The power conversion control unit converts the half-power control signal P h Converted into voltage control signal V h Then, it is input to the control end of the electron tube KT88 through the third resistor R3 and the first resistor R1 in sequence; at this time, the power output end of the electron tube KT88 outputs half power to the transformer;

[0042] If the single chip microcomputer determines that the output power adjustable circuit is currently in the half power mode, it does not output any signal to the power conversion control unit;

[0043] Of course, when entering the power saving mode (half-power state), the user can select the power saving mode with one key through the half-power switch (i.e., send a signal to the microcontroller to enter the power saving mode); the working principle of the half-power switch to adjust the output power adjustable circuit is similar to the principle of the remote control transmitter adjustment, which will not be repeated here;

[0044] The output power adjustable circuit of the utility model can enter the half-power mode by one-key through a half-power switch or a remote control transmitter, so that when the user needs a low volume state, the output power adjustable circuit quickly enters the half-power working state, thereby achieving the purpose of power saving, being green and environmentally friendly, and conforming to the general trend.

[0045] Moreover, the output power adjustable circuit of the utility model prolongs the life of power devices and other components by entering a half-power working state. The output power adjustable circuit of the utility model prolongs the life of power devices and other components by 3-6 times. The life extension time varies depending on different power devices.

[0046] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An output power adjustable circuit, characterized in that: include: Power device module, current sampling module, analog-to-digital conversion module, bias adjustment control module and power adjustment input module; The current sampling module is used to sample the current signal of the power device module; the analog-to-digital conversion module converts the current signal into a digital signal and inputs it into the bias adjustment control module; the bias adjustment control module controls the output power of the power device module according to the digital signal input by the analog-to-digital conversion module and the power adjustment control signal of the power adjustment input module.

2. The output power adjustable circuit according to claim 1, characterized in that: The bias voltage adjustment control module includes a single chip microcomputer and a power conversion control unit; The single-chip microcomputer receives the digital signal input by the analog-to-digital conversion module, and also receives the power adjustment control signal of the power adjustment input module; the single-chip microcomputer outputs the power control signal to the power conversion control unit according to the digital signal input by the analog-to-digital conversion module and the power adjustment control signal of the power adjustment input module; The power conversion control unit converts the power regulation control signal into a voltage control signal and outputs the signal to the power control terminal of the power device module to control the output power of the power device module.

3. The output power adjustable circuit according to claim 2, characterized in that: The bias voltage adjustment control module further includes a remote control receiving unit connected to the single chip microcomputer; the power adjustment input module includes a remote control transmitting unit; The remote control transmitting unit sends a power adjustment control signal to the remote control receiving unit.

4. The output power adjustable circuit according to claim 2, characterized in that: The power adjustment input module also includes a half-power switch unit; The half-power switch unit sends a power regulation control signal to the single-chip microcomputer.

5. The output power adjustable circuit according to claim 2, characterized in that: The power device module includes a power device, and the power device is an IGBT, a MOSFET, a VMOSFET or an electron tube.

6. The output power adjustable circuit according to claim 5, characterized in that: The power device module further includes a first resistor R1; one end of the first resistor R1 is connected to the control end of the power device, and the other end of the first resistor R1 is connected to the output end of the bias adjustment control module.

7. The output power adjustable circuit according to claim 6, characterized in that: The power device module further includes a third resistor R3; the third resistor R3 is connected in series between the first resistor R1 and the output end of the bias adjustment control module.

8. The output power adjustable circuit according to claim 5, characterized in that: The current sampling module includes a sampling resistor R2, and the sampling resistor R2 is connected in series to the output end of the power device.

9. The output power adjustable circuit according to claim 5, characterized in that: The power device is a KT88 electron tube.

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