CN103167316B - Input signal detection circuit and related liquid crystal television - Google Patents
Input signal detection circuit and related liquid crystal television Download PDFInfo
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- CN103167316B CN103167316B CN201310083023.9A CN201310083023A CN103167316B CN 103167316 B CN103167316 B CN 103167316B CN 201310083023 A CN201310083023 A CN 201310083023A CN 103167316 B CN103167316 B CN 103167316B
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Abstract
The invention discloses an input signal detection circuit and a liquid crystal television. The detection circuit comprises a reverse amplifying circuit, an integrating circuit and a switching circuit, wherein the reverse amplifying circuit is coupled to a first voltage source and used for receiving audio and video signals to generate amplifying signals; the integrating circuit is used for integrating the amplifying signals to generate integrating signals; the switching circuit comprises a first transistor and a second transistor, wherein the input end of the first transistor is coupled to the integrating circuit to receive the integrating signals, and the first bias end of the first transistor is coupled to a second voltage source; and the input end of the second transistor is coupled to the first bias end of the first transistor, the bias end of the second transistor is coupled to a third voltage source, and the output end of the second transistor is used for outputting turn-on signals. The input signal detection circuit and the liquid crystal television can reduce power consumption in a standby mode.
Description
The divisional application that the application is the applying date is on May 26th, 2010, application number is 201010189690.1, denomination of invention is the application for a patent for invention of " circuit for checking input signals and relative liquid crystal display television ".
Technical field
The present invention discloses a kind of circuit for checking input signals and relevant LCD TV, espespecially a kind ofly in standby mode, saves the circuit for checking input signals of electrical source consumption and relevant LCD TV.
Background technology
Refer to Fig. 1, it is a kind of simple function block schematic diagram of general LCD TV 100.As shown in Figure 1, LCD TV 100 comprises main system board 105, display floater 160, loud speaker 170 and frequency converter 150.Main system board 105 comprises power panel 110, secondary microcontroller 120, computing unit 130 and audio frequency amplifier 140.Standby power module 112 and main power source module 114 is included in power panel 110.Computing unit power supply V1, audio frequency amplifier power supply V2, backlight electric power V3 is included in main power source module 114.When LCD TV 100 enters standby mode, power panel 110 only can retain the power supply of standby power module 112, and closes all power supplys that main power source module 114 comprises.When LCD TV 100 enters normal manipulation mode for departing from standby mode afterwards, standby power module 112 can provide standby voltage Vsb to secondary microcontroller 120, when secondary microcontroller 120 receives the start signal of prompting key command or remote command, the secondary microcontroller 120 signal PON that just output potential is higher starts the computing unit power supply V1 that main power source module 114 comprises, audio frequency amplifier power supply V2, and backlight electric power V3, with respective start-up simulation unit 130, audio frequency amplifier 140, frequency converter 150, and drive display floater 160 and loud speaker 170 according to this, wherein frequency converter 150 is used for driving the backlight mode of display floater 160.But although in stand-by mode, standby power module 112 still can consume the suitable electric power of main system board 105, therefore standby power module 112 still remains with progressive space under the standby mode of LCD TV 100 in saving power consumption.
Summary of the invention
The present invention discloses a kind of circuit for checking input signals.This circuit for checking input signals comprises switch and transistor.This switch comprises opening end, shutdown side and output.This opening end is ground connection.This shutdown side is used for receiving shutdown signal.This switch decides to export according to whether receiving this shutdown signal the signal that this shutdown side or this opening end input.The input of this transistor is coupled to this output of this switch.The bias terminal of this transistor is coupled to voltage source.The output of this transistor is used for exporting start signal.This start signal is used for the power supply that unlatching one power panel comprises.
The present invention discloses a kind of circuit for checking input signals.This circuit for checking input signals comprises reverse amplification circuit, integrating circuit and switching circuit.This reverse amplification circuit is coupled to the first voltage source.This reverse amplification circuit is used for receiving video-audio signal, to produce amplifying signal.This integrating circuit is used for this amplifying signal of integration, to produce integrated signal.This switching circuit comprises the first transistor and transistor seconds.The input of this first transistor is coupled to this integrating circuit to receive this integrated signal, and the first bias terminal of this first transistor is coupled to the second voltage source.The input of this transistor seconds is coupled to this first bias terminal of this first transistor, and the bias terminal of this transistor seconds is coupled to tertiary voltage source, and the output of this transistor seconds is used for exporting start signal.This start signal is used for the power supply that unlatching one power panel comprises.
The present invention discloses a kind of circuit for checking input signals.This circuit for checking input signals comprises the first switching circuit and second switch circuit.This first switching circuit comprises the first transistor.The input of this first transistor is used for receiving data-signal, and the bias terminal of this first transistor is ground connection.This second switch circuit comprises transistor seconds.The input of this transistor seconds is coupled to output and first voltage source of this first transistor.The bias terminal of this transistor seconds is coupled to the second voltage source.The output of this transistor seconds exports enabling signal.This enabling signal is used for the power supply that startup one power panel comprises.
The present invention discloses a kind of circuit for checking input signals.This circuit for checking input signals comprises reverse amplification circuit, integrating circuit, switching circuit and self-hold circuit.This reverse amplification circuit is coupled to the first voltage source.This reverse amplification circuit is used for receiving remote signal, to produce amplifying signal.This integrating circuit is used for this amplifying signal of integration, to produce integrated signal.This switching circuit comprises the first transistor and transistor seconds.The input of this first transistor is coupled to this integrating circuit, to receive this integrated signal.First bias terminal of this first transistor is ground connection.Second bias terminal of this first transistor is coupled to the second voltage source.The input of this transistor seconds is coupled to this second bias terminal of this first transistor.The bias terminal of this transistor seconds is coupled to tertiary voltage source.The output of this transistor seconds exports enabling signal.This enabling signal is used for the power supply that unlatching one power panel comprises.This self-hold circuit comprises third transistor.The input of this third transistor is coupled to this enabling signal.First bias terminal of this third transistor is ground connection.Second bias terminal of this third transistor is coupled to this input of this transistor seconds.
The present invention discloses a kind of LCD TV.This LCD TV comprises battery, input signal pattern testing circuit, signal source, relay, power panel and display floater.This input signal pattern testing circuit is coupled to the electric power that this battery provides to receive this battery.This circuit for checking input signals receives shutdown signal, video-audio signal, data-signal and/or remote signal, and produces enabling signal according to those signals.This input signal pattern testing circuit comprises power supply signal testing circuit, video-audio signal testing circuit, detection of data signal circuit and remote signal testing circuit.This power supply signal testing circuit is used for producing this enabling signal according to this shutdown signal.This video-audio signal testing circuit is used for producing this enabling signal according to this video-audio signal.This detection of data signal circuit is used for producing this enabling signal according to this data-signal.This remote signal testing circuit is used for producing this enabling signal according to this remote signal.This signal source is used to provide multiple drive singal.This relay (Relay) this input signal pattern testing circuit of cause receives this enabling signal, and receives the plurality of drive singal by this signal source of cause.This power panel is coupled to this relay, with according to being activated its power supply in this enabling signal cause standby mode and receiving the plurality of drive singal.This display floater is coupled to this power panel, and is used for the electric power that receives with this power panel and show a picture according to the plurality of drive singal.
The present invention also discloses a kind of LCD TV, and this LCD TV comprises: battery; Input signal pattern testing circuit, be coupled to the electric power that this battery provides to receive this battery, this input signal pattern testing circuit receives shutdown signal, video-audio signal, data-signal or remote signal, and produce enabling signal according to those signals, this input signal pattern testing circuit comprises testing circuit, is used for producing this enabling signal according to this shutdown signal, video-audio signal, data-signal or remote signal; Signal source, is used to provide multiple drive singal; Relay, is used for receiving this enabling signal from this input signal pattern testing circuit, and is used for receiving the plurality of drive singal from this signal source; Power panel, is coupled to this relay, with according to this enabling signal, starts its power supply and receive the plurality of drive singal in standby mode; And display floater, be coupled to this power panel, and be used for the electric power that receives with this power panel and show a picture according to the plurality of drive singal.
Accompanying drawing explanation
Fig. 1 is a kind of simple function block schematic diagram of general LCD TV.
The simple function block schematic diagram of the LCD TV of Fig. 2 disclosed by the present invention.
Fig. 3,4,5,6 comprises by the LCD TV shown in Fig. 2 the schematic diagram of various circuit for checking input signals.
[main element label declaration]
Embodiment
In order to further reduce set standby power module power consumption in stand-by mode in LCD TV, the present invention is the unlike signal source used corresponding to LCD TV, exposure has various circuit for checking input signals, and discloses the LCD TV comprising these circuit for checking input signals.
Refer to Fig. 2, the simple function block schematic diagram of its LCD TV 200 disclosed by the present invention.As shown in Figure 2, LCD TV 200 comprises main system board 205, frequency converter 150, display floater 160 and loud speaker 170.Main system board 205 comprises input power 210, relay 220, power panel 110, computing unit 130, audio frequency amplifier 140 and input signal pattern testing circuit 250.Main system board 205 optionally arranges battery 280 in addition, to supply input signal pattern testing circuit 250 power consumption required in stand-by mode.Input signal pattern testing circuit 250 comprises the first circuit for checking input signals 300, second circuit for checking input signals 400, the 3rd circuit for checking input signals 500 and the 4th circuit for checking input signals 600.First circuit for checking input signals 300 receives shutdown signal Power_key, namely indicate TV signal just receive by LCD TV 200, therefore the first circuit for checking input signals 300 can send signal PON and makes LCD TV 200 depart from standby mode.Second circuit for checking input signals 400 receives video-audio signal AV, indicate when receiving video-audio signal AV TV signal just receive by LCD TV 200, therefore the second circuit for checking input signals 400 can send signal PON makes LCD TV 200 depart from standby mode; Wherein video-audio signal AV can be composite terminal signal (Composite video connector sigal).3rd circuit for checking input signals 500 reception represents the first data-signal HDMI of outer input data or represents personal computer (Personal Computer, PC) the second data-signal PC, indicate when receiving data-signal HDMI the data of outside input or the personal computer signal of outside just receive by LCD TV 200, therefore the 3rd circuit for checking input signals 500 can produce signal PON according to this make LCD TV 200 depart from standby mode; Wherein data-signal HDMI can be high resolution multimedia interface signal (High Definition Multimedia Interface Signal, HDMI signal).4th circuit for checking input signals 600 receives remote signal IR, indicate that when receiving remote signal IR outside remote controller sends instruction and will open LCD TV 200, therefore the 4th circuit for checking input signals 600 can make LCD TV 200 depart from standby mode by generation signal PON according to this; Note that in the various embodiments of the invention, because the signal strength signal intensity of video-audio signal AV and remote signal IR is lower, therefore need with amplifying circuit, respective signal strength signal intensity improved and comparatively easily carry out trace routine.When input signal pattern testing circuit 600 receives the signal of the circuit for checking input signals that it comprises, signal PON can be produced to open or closed relay 220, make relay 220 can power-on plate 110 power supply V1, V2, V3 of comprising, and those power supplys be unlocked be in order to open each self-corresponding device.
The detailed embodiment of above-mentioned each circuit for checking input signals 300,400,500,600 will be described below.Refer to Fig. 3, it is the schematic diagram of the circuit for checking input signals 300 shown in Fig. 2.As shown in Figure 3, circuit for checking input signals 300 comprises interrupteur SW 101, transistor Q101, resistance R101, R102 and diode D101.Interrupteur SW 101 comprises opening end NC and shutdown side NA.Opening end NC is ground connection.Shutdown side NA is used for receiving shutdown signal Power_key, and interrupteur SW 101 decides to export earthing potential signal that shutdown side NC couples or the shutdown signal Power_key that opening end NA inputs according to whether receiving shutdown signal Power_key.The input of transistor Q101 is coupled to the output NB of interrupteur SW 101 by resistance R101, the bias terminal of transistor Q101 is coupled to standby voltage source Vsb31, and the output of transistor Q101 is used for exporting start signal PON, to open relay 220 and power panel 110.The first end of resistance R101 is coupled to the output NB of interrupteur SW 101, and second end of resistance R101 is coupled to the input of transistor Q101.The first end of resistance R102 is coupled to second end of resistance R101, and second end of resistance R102 is coupled to the bias terminal of transistor Q101.
In a preferred embodiment of the present invention, transistor Q101 is pnp type Bipolar Junction Transistor (Bipolar Junction Transistor), the input of transistor Q101 is base stage (Base), the bias terminal of transistor Q101 is emitter-base bandgap grading (Emitter), and the output of transistor Q101 is collector (Collector).The input of diode D101 is coupled to the output of transistor Q101, and the second end output signal PON of diode D101.
The function mode of circuit for checking input signals 300 is that details are as follows.When LCD TV 200 enters standby mode by normal operating conditions, interrupteur SW 101 can switch to shutdown side NA, and make the input end of transistor Q101 in high potential and transistor Q101 is closed, therefore signal PON can be in electronegative potential.Otherwise, when LCD TV 200 enters normal operating conditions by standby mode, interrupteur SW 101 can switch to opening end NC, make the input end of transistor Q101 in electronegative potential and transistor Q101 is opened, therefore signal PON can be in high potential and open power supply V1, V2, V3 that relay 220 and power panel 110 comprise.
Refer to Fig. 4, it is the schematic diagram of circuit for checking input signals 400 shown in Fig. 2.As shown in Figure 4, circuit for checking input signals 400 comprises electric capacity C201, resistance R201, reverse amplification circuit 410, integrating circuit 420, switching circuit 430 and diode D201.Reverse amplification circuit 410 is coupled to the first standby voltage source Vsb41.
Reverse amplification circuit 410 receives the lower video-audio signal AV of current potential by electric capacity C201 and resistance R201, and improves, the current potential of video-audio signal AV to produce amplifying signal AV_A.Reverse amplification circuit 410 comprises transistor Q201, resistance R202, R203, R204; The input of transistor Q201 receives video-audio signal AV by resistance R201 and electric capacity C201; First bias terminal of transistor Q201 is coupled to standby voltage source Vsb41 by resistance R204, and second bias terminal of transistor Q201 is ground connection.
Integrating circuit 420 comprises electric capacity C202 and resistance R205.The first end of resistance R205 is used for receiving amplifying signal AV_A, and second end of resistance R205 is used for exporting integrated signal AV_C.The first end of electric capacity C202 is coupled to this second end of resistance R205, and second end of electric capacity C202 is ground connection.Integrating circuit 420 carries out integration by electric capacity C202 and resistance R205 to amplifying signal AV_A, to produce integrated signal AV_C.
Switching circuit 430 comprises transistor Q202 and Q203 and resistance R206, R207, R208 and R209.In switching circuit 430, the input of transistor Q202 is coupled to integrating circuit 420 to receive integrated signal AV_C, and first bias terminal of transistor Q202 is coupled to the second standby voltage source Vsb42.The input of transistor Q203 is coupled to the output of transistor Q202 by resistance R208, the bias terminal of transistor Q203 is coupled to the 3rd standby voltage source Vsb43, and the output of transistor Q203 is used for exporting start signal PON, to be used for opening power supply V1, V2, V3 that relay 220 and power panel 110 comprise.The first end of resistance R206 is coupled to this input of transistor Q202, and second end of resistance R206 is coupled to second bias terminal of transistor Q202 and ground connection.The first end of resistance R207 is coupled to this first bias terminal of transistor Q202, and second end of resistance R207 is coupled to the second standby voltage source Vsb42.The first end of resistance R208 is coupled to this first bias terminal of transistor Q202, and second end of resistance R208 is coupled to this input of transistor Q203.The first end of resistance R209 is coupled to this second end of resistance R208, and second end of resistance R209 is coupled to this bias terminal of transistor Q203.The first end of diode D201 is coupled to the output of transistor Q203 to receive and to output signal PON, to open power supply V1, V2, V3 that relay 220 and power panel 110 comprise.
In a preferred embodiment of the present invention, transistor Q201, Q202 are all npn type Bipolar Junction Transistor, and transistor Q203 is pnp type Bipolar Junction Transistor.Wherein, this input of transistor Q201 is base stage, and this first bias terminal of transistor Q201 is collector, and this second bias terminal of transistor Q201 is emitter-base bandgap grading; This input of transistor Q202 is base stage, and this bias terminal of transistor Q202 is collector, and the emitter-base bandgap grading of transistor Q202 is ground connection; This input of transistor Q203 is base stage, and this bias terminal of transistor Q203 is emitter-base bandgap grading, and this output of transistor Q203 is collector.
The mode of operation of circuit for checking input signals 400 is that details are as follows.After circuit for checking input signals 400 receives the video-audio signal AV of high potential, transistor Q201 can be unlocked, and the current potential of video-audio signal AV can be exaggerated in reverse mode by the bias voltage of the dividing potential drop of resistance R202 and R203 and the first standby voltage source Vsb41, and result from the bias terminal of transistor Q201 with the form of amplifying signal AV_A; The meaning of reverse amplification described herein refers to when the current potential of video-audio signal AV is lower, the situation of the higher and related raising of dividing potential drop that the current potential being positioned at the bias terminal of transistor 201 can be assigned to compared to R204 because of resistance R202.Due to the unlatching of transistor Q201, the current potential of the bias terminal of transistor Q201 can decline, and therefore in fact amplifying signal AV_A is positioned at electronegative potential.The amplifying signal AV_A being positioned at electronegative potential is integrated to by integrating circuit 420 to be positioned at the integrated signal AV_C of high potential in the input generation of transistor Q202 to a certain degree and transistor Q202 is opened; Thus, the current potential of first bias terminal of transistor Q202 can decline and be in electronegative potential, and transistor Q203 is opened.Due to the unlatching of transistor Q203, the current potential of the output of transistor Q203 can be subject to the bias voltage of the 3rd standby voltage source Vsb43 and occur high potential, therefore now signal PON is in high potential, and opens power supply V1, V2, V3 that relay 220 comprises with power panel 110.
Refer to Fig. 5, it is the schematic diagram of the circuit for checking input signals 500 shown in Fig. 2.As shown in Figure 5, circuit for checking input signals 500 comprises the first switching circuit 510, second switch circuit 520 and diode D301.First switching circuit 510 comprises transistor Q301 and resistance R301, R302.Second switch circuit 520 comprises transistor Q302 and resistance R303, R304, R305.
In the first switching circuit 510, the input of transistor Q301 receives data-signal HDMI or PC by resistance R301, and the bias terminal of transistor Q301 is ground connection.The first end of resistance R301 is used for receiving data-signal HDMI or PC, and second end of resistance R301 is coupled to this input of transistor Q301.The first end of resistance R302 is coupled to this second end of resistance R301, and second end of resistance R302 is ground connection.
In second switch circuit 520, the input of transistor Q302 is coupled to output and the first standby voltage source Vsb51 of transistor Q301 by resistance R304, the bias terminal of transistor Q302 is coupled to the second standby voltage source Vsb52, and the output of transistor Q302 output signal PON, power supply V1, V2, V3 of comprising with starting relay 220 and power panel 110.The first end of resistance R303 is coupled to this output of transistor Q301, and second end of resistance R303 is coupled to the first standby voltage source Vsb51.The first end of resistance R304 is coupled to this output of transistor Q301, and second end of resistance R304 is coupled to this input of transistor Q302.The first end of resistance R305 is coupled to this second end of resistance R304, and second end of resistance R305 is coupled to this bias terminal of transistor Q302.The first end of diode D301 is coupled to this output of transistor Q302, and second end of diode D301 is used for outputing signal PON.
In a preferred embodiment of the present invention, transistor Q301 is npn type Bipolar Junction Transistor, and transistor Q302 is pnp type Bipolar Junction Transistor, wherein this input of transistor Q301 is base stage, this bias terminal of transistor Q301 is emitter-base bandgap grading, and this output of transistor Q301 is collector, and this input of transistor Q302 is base stage, this bias terminal of transistor Q302 is emitter-base bandgap grading, and this output of transistor Q302 is collector.
The function mode explanation of circuit for checking input signals 500 is as follows.When circuit for checking input signals 500 receives data-signal HDMI or the PC of high potential, transistor Q301 can be unlocked and the current potential of the output of pulldown transistors Q301, and therefore turn-on transistor Q302.Thus, the current potential of the output of transistor Q302 can rise because being subject to the bias voltage of the second standby voltage source Vsb52, makes signal PON be positioned at high potential, and and then opens power supply V1, V2, V3 that relay 220 and power panel 110 comprise.
Refer to Fig. 6, it is the schematic diagram of circuit for checking input signals 600 shown in Fig. 2.As shown in Figure 6, circuit for checking input signals 600 comprises resistance R501, reverse amplification circuit 610, integrating circuit 620, switching circuit 630, self-hold circuit 640 and diode D501.Reverse amplification circuit 610 comprises transistor Q501 and resistance R502, R503, R504.Integrating circuit 620 comprises resistance R505 and electric capacity C501.Switching circuit 630 comprises transistor Q502 and Q504 and resistance R506, R507, R508, R509, R512.Self-hold circuit 640 comprises transistor Q503 and resistance R510, R511.
In reverse amplification circuit 610, the first bias terminal that the input of transistor Q501 receives remote signal IR, transistor Q501 by resistance R501 is ground connection, and second bias terminal of transistor Q501 is coupled to the first standby voltage source Vsb61.The first end of resistance R503 is coupled to this input of transistor Q501, and second end of resistance R503 is coupled to this first bias terminal of transistor Q501.The first end of resistance R502 is coupled to this input of transistor Q501, and second end of resistance R502 is coupled to the first standby voltage source Vsb61.The first end of resistance R504 is coupled to this second bias terminal of transistor Q501, and second end of resistance R504 is coupled to this second end of resistance R502.Reverse amplification circuit 610 receives remote signal IR and is amplified in an inverse manner by its current potential, and produces amplifying signal IR_A in this second bias terminal of transistor Q501.
In integrating circuit 620, the first end of resistance R505 is coupled to this second bias terminal of transistor 501 to receive this amplifying signal IR_A, and second end of resistance R505 is used for exporting integrated signal IR_C.The first end of electric capacity C501 is coupled to this second end of resistance R505, and second end of electric capacity C501 is ground connection.Integrating circuit 620 by received amplifying signal IR_A in addition integration, and exports integrated signal IR_C at this second end of resistance R505.
In switching circuit 630, the input of transistor Q502 is coupled to resistance R505, and to receive integrated signal IR_C, first bias terminal of transistor Q502 is ground connection, and second bias terminal of transistor Q502 is coupled to the second standby voltage source Vsb62.The first end of resistance R506 is coupled to this input of transistor Q502, and the second end of resistance 506 is coupled to this first bias terminal of transistor Q502.The input of transistor Q504 is coupled to this second bias terminal being coupled to transistor Q502 by resistance R508, the bias terminal of transistor Q504 is coupled to the 3rd standby voltage source Vsb63, and the output of transistor Q504 exports enabling signal PON, to open power supply V1, V2, V3 that relay 220 and power panel 110 comprise.The first end of resistance R507 is coupled to this output of transistor Q502, and second end of resistance R507 is coupled to the second standby voltage source Vsb62.The first end of resistance R508 is coupled to this output of transistor Q502, and second end of resistance R508 is coupled to this input of transistor Q504.The first end of resistance R509 is coupled to this input of transistor Q504, and second end of resistance R509 is coupled to the 3rd standby voltage source Vsb63.The first end of resistance R512 is coupled to this second end of resistance R509, and second end of resistance R512 is coupled to this bias terminal of transistor Q504.
In self-hold circuit 640, the input of transistor Q503 is coupled to and receives enabling signal PON, and first bias terminal of transistor Q503 is ground connection, and second bias terminal of transistor Q503 is coupled to this input of transistor Q504.The first end of resistance R510 receives enabling signal PON, and second end of resistance R510 is coupled to this input of transistor Q503.The first end of resistance R511 is coupled to this second end of resistance R510, and second end of resistance R511 is ground connection.
In a preferred embodiment of the present invention, transistor Q501, Q502, Q503 are npn type Bipolar Junction Transistor, and transistor Q504 is pnp type Bipolar Junction Transistor.Therefore this input of transistor Q502 is base stage, and this bias terminal of transistor Q502 is emitter-base bandgap grading, and this output of transistor Q502 is collector; This input of transistor Q504 is base stage, and this bias terminal of transistor Q504 is emitter-base bandgap grading, and this output of transistor Q504 is collector; This input of transistor Q503 is base stage, and this first bias terminal of transistor Q503 is emitter-base bandgap grading, and this second bias terminal of transistor Q503 is collector; This input of transistor Q501 is base stage, and this first bias terminal of transistor Q501 is emitter-base bandgap grading, and this second bias terminal of transistor Q501 is collector.
The function mode of circuit for checking input signals 600 is that explanation is as follows.When user starts remote controller momently, and during the appearance high potential making remote signal IR of short duration, reverse amplification circuit 610 can by remote signal IR to amplify as above-mentioned reverse manner, and produce amplifying signal IR_A in second bias terminal of transistor Q501, then integrating circuit 620 can by amplifying signal IR_A in addition integration produce integrated signal IR_C.When the current potential of integrated signal IR_C be accumulate to be enough to by its high potential, transistor Q502 be opened time, the current potential of the output of transistor Q502 can decline and transistor Q504 is unlocked, the current potential of the output of transistor Q504 is made to present high potential under the bias voltage of the 3rd standby voltage source Vsb63, and export the enabling signal PON of high potential according to this, to open power supply V1, V2, V3 that relay 220 and power panel 110 comprise.But, due to the remote signal IR that starts by user only can maintain the high potential of one period of short time, if remote signal IR is returned to electronegative potential more afterwards, then enabling signal PON will be returned to electronegative potential and cause the closedown of above-mentioned each power supply; In order to prevent this situation, self-hold circuit 640, by the input of transistor Q504 is remained on electronegative potential, keeps the high potential of enabling signal PON.When self-hold circuit 640 receives the enabling signal PON of high potential by resistance R510, transistor Q503 can open and continue the input current potential of pulldown transistors Q504, and keeps the unlatching of transistor Q504 and the high potential of enabling signal PON.
The circuit for checking input signals that the present invention discloses a kind of LCD TV and corresponds to set by all kinds signal.This LCD TV can make real-time reaction to depart from or to enter standby mode for received shutdown signal, video-audio signal, data-signal and remote signal, the closedown of each main power source of LCD TV is then kept, to guarantee the minimizing of power consumption when not receiving any one signal for departing from standby mode.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the claims in the present invention scope change and modify, and all should belong to covering scope of the present invention.
Claims (4)
1. a circuit for checking input signals, comprises:
Reverse amplification circuit, is coupled to the first voltage source, and this reverse amplification circuit is used for receiving video-audio signal, to produce amplifying signal;
Integrating circuit, is used for this amplifying signal of integration, to produce integrated signal; And
Switching circuit, comprises:
The first transistor, its input is coupled to this integrating circuit to receive this integrated signal, and the first bias terminal of this first transistor is coupled to the second voltage source; And
Transistor seconds, its input is coupled to this first bias terminal of this first transistor, and the bias terminal of this transistor seconds is coupled to tertiary voltage source, and the output of this transistor seconds is used for exporting start signal.
2. circuit for checking input signals according to claim 1,
Wherein this first transistor is npn type Bipolar Junction Transistor, and this transistor seconds is pnp type Bipolar Junction Transistor;
Wherein this input of this first transistor is base stage, and this first bias terminal of this first transistor is collector, and the emitter-base bandgap grading of this first transistor is ground connection;
Wherein this input of this transistor seconds is base stage, and this bias terminal of this transistor seconds is emitter-base bandgap grading, and this output of this transistor seconds is collector.
3. a circuit for checking input signals, comprises:
Reverse amplification circuit, is coupled to the first voltage source, and this reverse amplification circuit is used for receiving remote signal, to produce amplifying signal;
Integrating circuit, is used for this amplifying signal of integration, to produce integrated signal;
Switching circuit, comprises:
The first transistor, its input is coupled to this integrating circuit, and to receive this integrated signal, the first bias terminal of this first transistor is ground connection, and the second bias terminal of this first transistor is coupled to the second voltage source; And
Transistor seconds, its input is coupled to this second bias terminal of this first transistor, the bias terminal of this transistor seconds is coupled to tertiary voltage source, and the output of this transistor seconds exports enabling signal, and wherein this enabling signal is used for the power supply that unlatching one power panel comprises; And
Self-hold circuit, comprises:
Third transistor, its input is coupled to this enabling signal, and the first bias terminal of this third transistor is ground connection, and the second bias terminal of this third transistor is coupled to this input of this transistor seconds.
4. circuit for checking input signals according to claim 3,
Wherein this first transistor and this third transistor are all npn type Bipolar Junction Transistor, and this transistor seconds is pnp type Bipolar Junction Transistor;
Wherein this input of this first transistor is base stage, and this first bias terminal of this first transistor is emitter-base bandgap grading, and this second bias terminal end of this first transistor is collector;
Wherein this input of this transistor seconds is base stage, and this bias terminal of this transistor seconds is emitter-base bandgap grading, and this output of this transistor seconds is collector; And
Wherein this input of this third transistor is base stage, and this first bias terminal of this third transistor is emitter-base bandgap grading, and this second bias terminal of this third transistor is collector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310083023.9A CN103167316B (en) | 2010-05-26 | 2010-05-26 | Input signal detection circuit and related liquid crystal television |
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| CN201310083023.9A CN103167316B (en) | 2010-05-26 | 2010-05-26 | Input signal detection circuit and related liquid crystal television |
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| CN 201010189690 Division CN101883205B (en) | 2010-05-26 | 2010-05-26 | Circuit for checking input signals and relative liquid crystal display television |
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|---|---|---|---|---|
| CN104700601A (en) * | 2013-12-08 | 2015-06-10 | 张红碧 | An electric appliance remote control starter, a television set, an air conditioner and a supply socket |
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| Publication number | Publication date |
|---|---|
| CN103167316A (en) | 2013-06-19 |
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