CN201114441Y - Power off silence circuit and TV with this circuit - Google Patents
Power off silence circuit and TV with this circuit Download PDFInfo
- Publication number
- CN201114441Y CN201114441Y CNU2007200263036U CN200720026303U CN201114441Y CN 201114441 Y CN201114441 Y CN 201114441Y CN U2007200263036 U CNU2007200263036 U CN U2007200263036U CN 200720026303 U CN200720026303 U CN 200720026303U CN 201114441 Y CN201114441 Y CN 201114441Y
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- Prior art keywords
- diode
- triode
- resistance
- mute circuit
- television set
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- Expired - Fee Related
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Abstract
The utility model provides a turnoff mute circuit and a TV with the circuit. The utility model realizes that the mute of a loudhailer is maintained at the moment when the TV is turned off, thereby not only solving the problem of noises when turning off but also having no effect on the normal application of the TV. The turnoff mute circuit of the utility model consists of a triode, a capacitor, a diode, resistances and other discrete components; the emitter of the triode is not only connected with a power through a first diode, but also is earthed through the capacitor; a base is not only connected with the power through a second diode, but also is earthed through a first resistance and a collector outputs a mute control signal through a third diode. The turnoff mute circuit of the utility model effectively eliminates noises of shock wave at the moment of turnoff and improves the quality of TV products.
Description
Technical field
The utility model relates to a kind of mute circuit, relates to a kind of shutdown mute circuit that is used for television set more specifically.
Background technology
Along with the raising day by day of living standard, the user is also more and more higher to the requirement of television set.Yet at present the television set used always of user is when shutdown, loud speaker through regular meeting send similar " bang " noise, this can produce uncomfortable feeling to the user.And send " bang " in the sound, the immediate current of the loud speaker of flowing through can be very big, will certainly cause the very big damage to loud speaker, thereby shortened the useful life of loud speaker, reduced the reliability of television product.
The utility model content
In order to address the above problem, the utility model provides a kind of shutdown mute circuit, has realized keeping loud speaker quiet in the moment of television set shutdown, and the noise problem when having solved shutdown does not influence the normal use of television set again.
Shutdown mute circuit of the present utility model is made up of discrete elements such as triode, electric capacity, diode and resistance, concrete annexation is: the emitter of described triode connects the negative pole of first diode on the one hand, on the other hand by a capacity earth, base stage connects the negative pole of second diode on the one hand, on the other hand by first grounding through resistance, collector electrode is by quiet control signal of the 3rd diode output, and the positive pole of described first diode and second diode is connected a DC power supply.
Above-mentioned electric capacity can be an electrochemical capacitor, and the emitter of described triode connects the positive pole of this electric capacity, the minus earth of this electric capacity.
The positive pole of above-mentioned first diode and second diode can be connected described DC power supply by second resistance.
The base stage of above-mentioned triode can also connect the negative pole and described first resistance of described second diode by the 3rd resistance.
Above-mentioned triode can be the positive-negative-positive triode.
Further, the utility model also provides a kind of television set with above-mentioned shutdown mute circuit, this television set comprises power amplifier and power supply, this power amplifier comprises quiet control terminal, this shutdown mute circuit comprises a triode, the emitter of described triode connects the negative pole of first diode on the one hand, on the other hand by a capacity earth, base stage connects the negative pole of second diode on the one hand, on the other hand by first grounding through resistance, collector electrode connects described quiet control terminal by the 3rd diode, and the positive pole of described first diode and second diode is connected described power supply.
Above-mentioned electric capacity can be an electrochemical capacitor, and the emitter of described triode connects the positive pole of this electric capacity, the minus earth of this electric capacity.
The positive pole of above-mentioned first diode and second diode can be connected described DC power supply by second resistance.
The base stage of above-mentioned triode can also connect the negative pole and described first resistance of described second diode by the 3rd resistance.
Above-mentioned triode can be the positive-negative-positive triode.
Adopt above-mentioned shutdown mute circuit, effectively eliminated the sonic boom of shutdown moment, promoted the quality of tv product.
Description of drawings
Figure 1 shows that the schematic diagram of a general television set.
Figure 2 shows that the schematic diagram with television set of shutdown mute circuit of the present utility model.
Figure 3 shows that a kind of circuit diagram of shutdown mute circuit of the present utility model.
Embodiment
The utility model is described in more detail below in conjunction with the drawings and specific embodiments.
Figure 2 shows that the schematic diagram with television set of shutdown mute circuit of the present utility model.As shown in the figure, television set 100 of the present utility model comprises power amplifier 110, shutdown mute circuit 130, loud speaker 200 and power supply 140.Wherein, power amplifier 110 has a quiet control terminal 120, when quiet control terminal 120 is input as high level, power amplifier 110 will be in mute state, at this moment, no matter the input of power amplifier 110 is any signal, and loud speaker 200 can not sounded; And when quiet control terminal 120 was input as low level, power amplifier 110 was in normal operating conditions, and loud speaker 200 sends corresponding sound according to the signal of input.According to these characteristics, shutdown mute circuit 130 shuts down moment at television set 100, and the quiet control terminal 120 of control power amplifier 110 keeps high level, and when television set 100 operate as normal, the input voltage of quiet control terminal 120 keeps low level always.Like this, when the television set operate as normal, because quiet control terminal 120 is a low level, power amplifier 110 operate as normal; Shut down moment at television set 100, because quiet control terminal 120 is a high level, power amplifier 110 keeps mute state, and the neutral signal that import power amplifier 110 this moment will can not cut any ice to loud speaker 200, has so just avoided the generation of shutdown noise.
Figure 3 shows that a kind of physical circuit figure of shutdown mute circuit 130.As shown in the figure, Q1 is a triode, and the emitter of triode Q1 is connected power supply by resistance R 1 with diode D1 on the one hand, connects the positive pole of capacitor C 1 on the other hand, the minus earth of capacitor C 1.Collector electrode is connected to the quiet control terminal 120 of power amplifier 110 by D2.The base stage of Q1 is connected to the negative pole of R3 and D3 by resistance R 2, and the positive pole of D3 links to each other with the positive pole of D1, the other end ground connection of resistance R 2.
In the time of the machine operate as normal, power supply gives capacitor C 1 charging by R2 and D1, and at this moment, triode Q1 ends, power amplifier 110 operate as normal.In the moment of television set 100 shutdown, capacitor C 1 begins discharge, cause the Q1 conducting, at this moment, the collector electrode of Q1 becomes high level, this high level makes power amplifier be in mute state, thereby has eliminated the sonic boom when system for TV set shuts down by the quiet control terminal 120 that D2 exports power amplifier 110 to.So just realized that the shutdown mute circuit makes mute of television set in the moment of shutting down, and don't influenced the normal effect of using of television set.
In the foregoing circuit, triode Q1 is a NPN type triode, and the value of R1, R3 can be respectively 1K ohm and 10K ohm, R3 can be 0 ohm, and capacitor C 1 can be an electrochemical capacitor, and value can be 470 microfarads, certainly, the withstand voltage of capacitor C 1 must be greater than the output voltage of power supply 140.These values can be according to circumstances difference and change, as long as can guarantee this circuit operate as normal.
Above circuit and selecting for use of device are a preferred embodiment of the present utility model.The utility model also has other multiple real-time modes, for example, changes triode Q1 into CMOS pipe or the like.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (10)
1, a kind of shutdown mute circuit, it is characterized in that: described shutdown mute circuit comprises a triode, the emitter of described triode connects the negative pole of first diode on the one hand, on the other hand by a capacity earth, base stage connects the negative pole of second diode on the one hand, by first grounding through resistance, collector electrode is by quiet control signal of the 3rd diode output on the other hand, and the positive pole of described first diode and second diode is connected a DC power supply.
2, shutdown mute circuit according to claim 1 is characterized in that: described electric capacity is electrochemical capacitor, and the emitter of described triode connects the positive pole of this electric capacity, the minus earth of this electric capacity.
3, shutdown mute circuit according to claim 2 is characterized in that: the positive pole of described first diode and second diode is connected described DC power supply by second resistance.
4, shutdown mute circuit according to claim 3 is characterized in that: the base stage of described triode connects the negative pole and described first resistance of described second diode by the 3rd resistance.
5, according to the arbitrary described shutdown mute circuit of claim 1-4, it is characterized in that: described triode is the positive-negative-positive triode.
6, a kind of television set, comprise power amplifier and power supply, this power amplifier comprises quiet control terminal, it is characterized in that: described television set comprises the shutdown mute circuit, this shutdown mute circuit comprises a triode, the emitter of described triode connects the negative pole of first diode on the one hand, on the other hand by a capacity earth, base stage connects the negative pole of second diode on the one hand, on the other hand by first grounding through resistance, collector electrode connects described quiet control terminal by the 3rd diode, and the positive pole of described first diode and second diode is connected described power supply.
7, television set according to claim 6 is characterized in that: described electric capacity is electrochemical capacitor, and the emitter of described triode connects the positive pole of this electric capacity, the minus earth of this electric capacity.
8, television set according to claim 7 is characterized in that: the positive pole of described first diode and second diode is connected described power supply by second resistance.
9, television set according to claim 8 is characterized in that: the base stage of described triode connects the negative pole and described first resistance of described second diode by the 3rd resistance.
10, according to the arbitrary described television set of claim 6-9, it is characterized in that: described triode is the positive-negative-positive triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200263036U CN201114441Y (en) | 2007-08-01 | 2007-08-01 | Power off silence circuit and TV with this circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200263036U CN201114441Y (en) | 2007-08-01 | 2007-08-01 | Power off silence circuit and TV with this circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201114441Y true CN201114441Y (en) | 2008-09-10 |
Family
ID=39966189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200263036U Expired - Fee Related CN201114441Y (en) | 2007-08-01 | 2007-08-01 | Power off silence circuit and TV with this circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201114441Y (en) |
-
2007
- 2007-08-01 CN CNU2007200263036U patent/CN201114441Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080910 Termination date: 20120801 |