CN102645901A - Stand-by circuit - Google Patents

Stand-by circuit Download PDF

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Publication number
CN102645901A
CN102645901A CN201210123678XA CN201210123678A CN102645901A CN 102645901 A CN102645901 A CN 102645901A CN 201210123678X A CN201210123678X A CN 201210123678XA CN 201210123678 A CN201210123678 A CN 201210123678A CN 102645901 A CN102645901 A CN 102645901A
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unit
electrically connected
signal
voltage
switch control
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CN201210123678XA
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CN102645901B (en
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闫峻
马杰
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Ningbo Zhongrong Acoustics Technology Co Ltd
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Ningbo Zhongrong Acoustics Technology Co Ltd
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Abstract

The invention discloses a stand-by circuit. The stand-by circuit comprises a voltage conversion unit, a signal detection and sampling unit, a signal amplification unit, a switch control unit, a signal comparison unit, a transistor and a relay. An input end of the voltage conversion unit is electrically connected with a main power source, and an output end of the voltage conversion unit outputs a direct-current voltage. The signal detection and sampling unit, the signal amplification unit, the switch control unit, the signal comparison unit, the transistor and a coil of the relay are electrically connected with one another in sequence. An armature of the relay is in tandem connection with a power supply circuit of the main power source and a transformer. The invention can switch off the transformer in the stand-by state, and allows stand-by power of a power amplifier to be lower than 0.5W.

Description

Stand-by circuit
Technical field
The present invention relates to electronic technology field, specifically is a kind of stand-by circuit that is used for power amplification control circuit.
Background technology
The consciousness that improves efficiency, energy-saving and emission-reduction along with the whole world constantly strengthens, and improves power supply conversion efficiency, optimizes Low-power Technology and becomes the industry focus; At present, many countries have set up relevant efficiency standard, such as comparative energy label scheme and lowest energy property standard (MEPS) and Energy Star standard or the like; The EUP standard of European Union requires stand-by power consumption especially below 0.5W; If with our traditional power amplification control circuit, only let power amplifier partly be in holding state and just do not reach this standard far away, in our family expenses power amplifier; Only be that the loss that produces on the transformer is just very big; The stand-by power consumption of transformer reaches 3W, can't reach the EUP of European Union standard far away, causes the significant wastage of electric energy.
Summary of the invention
Technical matters to be solved by this invention is, is provided at the power supply that can break off transformer under the holding state, makes the stand-by power consumption of power amplifier be lower than the stand-by circuit of 0.5W.
For solving the problems of the technologies described above, stand-by circuit provided by the invention, it consists of the following components:
Voltage conversion unit, input sampling unit, signal amplification unit, switch control unit, signal comparing unit, transistor Q4 and relay J K1;
The input end of voltage conversion unit is electrically connected with primary power, the output terminal output dc voltage; Input sampling unit, signal amplification unit, switch control unit, signal comparing unit are electrically connected successively; The output terminal of signal comparing unit is electrically connected with the base stage of transistor Q4; The emitter of transistor Q4 is electrically connected with the output head anode of voltage conversion unit through the coil of relay J K1, that is to say that the emitter of transistor Q4 is electrically connected with an end of the coil of relay J K1, and the other end of the coil of relay J K1 is electrically connected with the output head anode of voltage conversion unit; The collector of transistor Q4 is electrically connected with the negative pole of output end of voltage conversion unit; Transistor Q4 is a positive-negative-positive switch triode, and the armature of relay J K1 is serially connected with the current supply circuit of primary power and transformer, is normally open contact on the armature;
The input sampling unit is used to detect the input of sound signal, and when having detected the sound signal input, it exports an AC controling signal;
Signal amplification unit is used for AC controling signal to input sampling unit output and amplifies and behind rectifying and wave-filtering, export dc control signal;
The switch control unit signal input part receives the dc control signal of signal amplification unit output; And make its voltage input end and voltage output end conducting through this dc control signal; The voltage input end of switch control unit is electrically connected with the output terminal of voltage conversion unit, two DC voltages of voltage output end output of switch control unit;
The signal comparing unit is used for two DC voltages to switch control unit output and compares and export a negative pressure then;
The base stage of transistor Q4 receives signal comparing unit output negative pressure and makes transistor Q4 self conducting through this negative pressure;
Relay J K1 is used to control the whether conducting of current supply circuit of primary power and transformer; That is to say when the input sampling unit has the signal input; Transistor Q4 conducting makes relay J K1 energising, the armature adhesive of relay J K1; Make primary power and transformer conducting, transformer and primary power are in off-state at ordinary times.
After adopting above structure, the present invention compared with prior art has following advantage:
Relay J K1 is in normally open when flat, has only when the input sampling unit to have detected the sound signal input, also just says when needing power amplifier to work; Relay J K1 is just closed, makes primary power and transformer conducting, and primary power is the power supply of power amplifier element through transformer; That is to say primary power and not conducting of transformer at ordinary times, the stand-by power consumption of transformer is zero, has only on the power supply IC stand-by power consumption is arranged; The stand-by power consumption of this power supply IC meets the EUP standard of European Union less than 0.5W.
As improvement, described switch control unit comprises NPN type switch triode Q1, positive-negative-positive switch triode Q2, and the base stage of Q1 is electrically connected with the output terminal of signal amplification unit; The collector of Q1 is electrically connected with the voltage input end of switch control unit, the grounded emitter of Q1, and the base stage of Q2 is electrically connected with the collector of Q1; The emitter of Q2 is electrically connected with the voltage input end of switch control unit, and the collector of Q2 is electrically connected with a delivery outlet of the voltage output end of switch control unit, and the voltage input end of switch control unit is electrically connected with another delivery outlet of voltage output end through dropping resistor R14; This switch control unit can be controlled high-tension conducting through a low-voltage direct current signal; That is to say when the base stage of Q1 has the direct current signal input, the Q1 conducting, this moment, the base stage of Q2 produced a negative pressure; Make the Q2 conducting; The DC voltage that makes 3.5V is through the negative pole conducting of Q2 with the signal comparing unit, and the DC voltage of original 3.5V is through the anodal conducting of a resistance R 14 and signal comparing unit, makes voltage difference of generation between the both positive and negative polarity of signal comparing unit; Make negative pressure of signal comparing unit output; Negative pressure makes positive-negative-positive switch triode Q4 conducting, and the Q4 conducting makes relay J K1 energising closed.
As improvement, described switch control unit also comprises NPN type switch triode Q3, capacitor C 5 and capacitor C 8, and the base stage of Q3 connects respectively at the negative pole of C5, the positive electrical of C8; The positive pole of C5 is electrically connected with the voltage input end of switch control unit, and the negative pole of C8 is electrically connected with the base stage of Q4, and the collector of Q3 is electrically connected with the collector of Q2; The grounded emitter of Q3 is being started shooting moment, and just the input sampling unit detects the moment of signal; Capacitor C 5 is recharged, and this moment, C5 was equivalent to be in short-circuit condition, the Q3 conducting; Relay J K1 misoperation in the time of can preventing to start shooting like this is during shutdown, during also with regard to the blackout of sample of signal detecting unit; Capacitor C 8 sparks and makes the Q3 conducting, can effectively suppress the impulsive sound that shuts down.
As improvement, described voltage conversion unit is the power supply IC of model LNK605, and LNK605 is the common integrated circuit modules that is used for voltage transitions.
As improvement, described input sampling unit is RCA audio input interface CN3, and the RCA audio input interface is an input interface the most frequently used in the power amplifier.
As improvement, described signal amplification unit is the amplifier U1A of model NJM4558, and amplifier is the amplifier that is operated in the closed loop state, and the plus earth of U1A is used to offset bias voltage, is connected to feedback circuit between the output terminal of U1A and the negative pole.
As improvement, the comparer U1B that described signal comparing unit is model NJM4558, comparer are the amplifier that is operated in open loop situations, and the cathode voltage of U1B is greater than cathode voltage, and output terminal is exported a negative pressure.
As improvement, described amplifier U1A and comparer U1B are integrated into an integrated chip, thereby the output terminal of power supply IC is connected with this integrated chip and is this integrated chip power supply, and circuit level is high, designs simplification.
As improvement; The coil two ends of described relay J K1 are parallel with a backward dioded D2; The current lead-through of current lead-through direction and relay J K1 that is to say diode D2 is in the opposite direction, and the element of D2 in can holding circuit do not punctured by the induced voltage of relay coil or burn out, and D2 receives the relay coil two ends in parallel; And with its formation loop; During shutdown, the high electromotive force that makes its generation in the loop with continuous current system consumption, thereby the element that plays in the holding circuit is not damaged.
Description of drawings
Fig. 1 is the circuit theory diagrams of stand-by circuit of the present invention.
Wherein, 1, voltage conversion unit; 2, input sampling unit; 3, signal amplification unit; 4, switch control unit; 5, signal comparing unit; 6, primary power.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done explanation in further detail.
Circuit theory diagrams by stand-by circuit of the present invention shown in Figure 1 can know that it consists of the following components:
Voltage conversion unit 1, input sampling unit 2, signal amplification unit 3, switch control unit 4, signal comparing unit 5, transistor Q4 and relay J K1;
The input end of voltage conversion unit 1 is electrically connected with primary power 6, the output terminal output dc voltage; Input sampling unit 2, signal amplification unit 3, switch control unit 4, signal comparing unit 5 are electrically connected successively; The output terminal of signal comparing unit 5 is electrically connected with the base stage of transistor Q4; The emitter of transistor Q4 is electrically connected with the output head anode of voltage conversion unit 1 through the coil of relay J K1, that is to say that the emitter of transistor Q4 is electrically connected with an end of the coil of relay J K1, and the other end of the coil of relay J K1 is electrically connected with the output head anode of voltage conversion unit; The collector of transistor Q4 is electrically connected with the negative pole of output end of voltage conversion unit; Transistor Q4 is a positive-negative-positive switch triode, and the armature of relay J K1 is serially connected with the current supply circuit of primary power and transformer, is normally open contact on the armature.
The input end of voltage conversion unit 1 is electrically connected with primary power 6, the output terminal output dc voltage; Described primary power 6 is for being connected with civil power ac voltage input mouth through a voltage change-over switch; Described voltage conversion unit 1 is the power supply IC of model LNK605; The input voltage of power supply IC is 115V/230V, and output voltage is positive and negative 3.5V.
Input sampling unit 2 is used to detect the input of sound signal; When having detected the sound signal input; The AC controling signal that its output is one 3 millivolts; Described input sampling unit 2 is RCA audio input interface CN3,3 millivolts of AC controling signals of first pin output of CN3, the second pin ground connection.
Signal amplification unit 3 is used for the AC controling signal of input sampling unit 2 outputs is amplified; AC controling signal after the amplification is exported dc control signal behind rectifying and wave-filtering; Described signal amplification unit 3 is the amplifier U1A of model NJM4558; The input cathode of U1A is electrically connected with first pin of CN3 through current-limiting resistance R1 (2K), filter capacitor C1 (1uF), and the input anode of U1A is through resistance R 2 (10K) ground connection, and the input cathode of U1A and earth terminal also are connected to capacitor C 2 (22pF); Discharge prevention when resistance R 2 is used for amplifier U1A overcurrent with capacitor C 2; The input cathode of U1A and output terminal also are connected to backfeed loop, and backfeed loop is formed in parallel by resistance R 3 (4M) and capacitor C 3 (22pF), and the output terminal of U1A is serially connected with commutation diode D1 simultaneously; The model of D1 is N4148; And the output terminal of U1A and earth terminal also are connected to filter capacitor C4 (100nF), shunt resistance R5 (47K), and after commutation diode D1, filter capacitor C4 effect, AC controling signal becomes dc control signal.
The dc control signal of the signal input part reception amplifier U1A output of switch control unit 4; And make the voltage input end and the voltage output end conducting of switch control unit 4 through this dc control signal; The voltage input end of switch control unit 4 is electrically connected with the output head anode of power supply IC, two DC voltages of voltage output end output of switch control unit 4; Described switch control unit 4 comprises NPN type switch triode Q1, positive-negative-positive switch triode Q2; The base stage of Q1 is electrically connected with the output terminal of U1A through a current-limiting resistance R4 (10K); The collector of Q1 is electrically connected with the voltage input end of switch control unit 4 through current-limiting resistance R7 (10K); The emitter of Q1 is through current-limiting resistance R6 (1K) ground connection; The base stage of Q2 is electrically connected with the collector of Q1 through current-limiting resistance R8 (10K); The emitter of Q2 is electrically connected with the voltage input end of switch control unit, and the collector of Q2 is electrically connected with a delivery outlet of the voltage output end of switch control unit 4 through divider resistance R9 (3K3), and a delivery outlet and an earth terminal of while voltage output end also is connected to divider resistance R12 (200K); The voltage input end of switch control unit 4 is electrically connected with another delivery outlet of voltage output end through divider resistance R14 (20K), and another delivery outlet and the earth terminal of while voltage output end also is connected to divider resistance R13 (4K7).
Described switch control unit 4 also comprises NPN type switch triode Q3, capacitor C 5 and capacitor C 8, and the base stage of Q3 connects respectively at the negative pole of C5, the positive electrical of C8, and the positive pole of C5 is electrically connected with the voltage input end of switch control unit; The negative pole of C8 is electrically connected with the base stage of Q4, and the collector of Q3 is electrically connected with the collector of Q2, the grounded emitter of Q3; Starting shooting moment, just RCA audio input interface CN3 detects the moment of signal, and capacitor C 5 is recharged; This moment, C5 was equivalent to be in short-circuit condition, Q3 conducting, relay J K1 misoperation in the time of can preventing to start shooting like this; During shutdown; Just during the blackout of RCA audio input interface CN3, capacitor C 8 sparks and makes the Q3 conducting, can effectively suppress the impulsive sound that shuts down
Signal comparing unit 5 is used for two DC voltages to switch control unit 4 output and compares and export a negative pressure then; Described signal comparing unit 5 is the comparer U1B of model NJM4558; The input cathode of U1B is electrically connected with a delivery outlet of voltage control unit 4, and the input anode of U1B is electrically connected with another delivery outlet of voltage control unit 4, that is to say that the input cathode of U1B connects the collector of Q2 through resistance R 9; The input anode of U1B connects the output head anode of power supply IC through resistance R 14; Here the input cathode voltage of U1B makes the output terminal of U1B greater than cathode voltage, negative pressure of the 7th pin of U1B output just.
Amplifier U1A and comparer U1B are that the employing model is the amplifier of NJM4558; Just amplifier U1A is operated in the closed loop state of amplifier; Comparer U1B is operated in the open loop situations of amplifier; Amplifier U1A is electrically connected with the output terminal of power supply IC with the power supply port of comparer U1B, and power supply IC is amplifier U1A and comparer U1B power supply.
The base stage of transistor Q4 receives the negative pressure of signal comparing unit 5 outputs and makes transmitter and the collector conducting of transistor Q4 through this negative pressure; Transistor Q4 is a positive-negative-positive switch triode; The base stage of Q4 is electrically connected with the output terminal of U1B; The emitter of Q4 is electrically connected with the output head anode of power supply IC through the coil of relay J K1, and the collector of Q4 is electrically connected with the negative pole of output end of power supply IC.
The coil of relay J K1 is electrically connected with the emitter of transistor Q4, and its armature is serially connected with between the current supply circuit of primary power and transformer, and the energising through pilot relay JK1 comes the whether adhesive of armature of pilot relay JK1; During the coil electricity of relay J K1; The armature adhesive of relay J K1, the current supply circuit conducting of primary power and transformer is during the coil no power of relay J K1; The not adhesive of armature of relay J K1, the current supply circuit of primary power and transformer breaks off.
On the current supply circuit of primary power 6 and transformer JK1 and be connected to capacitor C 9, resistance R 9 (10M), be used for filtering and dividing potential drop, play steady current.
Described amplifier U1A and comparer U1B are integrated into an integrated chip, thereby the output positive and negative charge of power supply IC is electrically connected with this integrated chip respectively and is that this integrated chip power supply, power supply IC are that the amplifier U1A on the integrated chip supplies power with comparer U1B.
The coil two ends of described relay J K1 are parallel with a backward dioded D2, that is to say that the current lead-through of current lead-through direction and relay J K1 of diode D2 is in the opposite direction.
Principle of work of the present invention is following: CN3 detects sound signal when the RCA audio input interface, and the AC signal that its output is 3 millivolts is to the input cathode of amplifier U1A, and AC signal is exaggerated and is become direct current signal by rectifying and wave-filtering; Direct current signal is received by the base stage of switch triode Q1, makes the Q1 conducting, and the base stage of the switch triode Q3 that at this moment links to each other with the collector of Q1 produces a negative pressure; Negative pressure makes the Q3 conducting, makes the input end conducting of the output head anode of power supply IC through Q3 and comparer U1B, and the output head anode of the input anode of comparer U1B and power supply IC is conducting originally; Because the dividing potential drop effect of resistance makes the voltage of the voltage of U1B input cathode greater than input anode, make negative pressure of U1B output terminal output; This negative pressure makes switch triode Q4 conducting, after the Q4 conducting, relay J K1 is energized; At this moment the armature adhesive of relay J K1 makes the current supply circuit conducting of primary power and transformer, and transformer can be the power supply of power amplifier element; But power amplifier element operate as normal; This just can make transformer when standby, be disconnected power supply, and the stand-by power consumption that makes transformer is zero, and the stand-by power consumption of power supply IC is very little; Less than 0.5W, reduced stand-by power consumption greatly.
Below only use preferable instance and made explanation with regard to the present invention; But can not be interpreted as it is restriction to claim; Structure of the present invention can have other variations, is not limited to said structure, as with metal-oxide-semiconductor field effect transistor place of switches triode; In a word, all various variations of in the protection domain of independent claims of the present invention, being done are all in protection scope of the present invention.

Claims (9)

1. stand-by circuit is characterized in that it consists of the following components:
Voltage conversion unit (1), input sampling unit (2), signal amplification unit (3), switch control unit (4), signal comparing unit (5), transistor Q4 and relay J K1;
The input end of voltage conversion unit (1) is electrically connected with primary power (6), the output terminal output dc voltage; Input sampling unit (2), signal amplification unit (3), switch control unit (4), signal comparing unit (5) are electrically connected successively; The output terminal of signal comparing unit (5) is electrically connected with the base stage of transistor Q4; The emitter of transistor Q4 is electrically connected with the output head anode of voltage conversion unit (1) through the coil of relay J K1; The collector of transistor Q4 is electrically connected with the negative pole of output end of voltage conversion unit, and the armature of relay J K1 is serially connected with the current supply circuit of primary power and transformer;
Input sampling unit (2) is used to detect the input of sound signal, and when having detected the sound signal input, it exports an AC controling signal;
Signal amplification unit (3) is used for AC controling signal to input sampling unit (2) output and amplifies and behind rectifying and wave-filtering, export dc control signal;
Switch control unit (4) signal input part receives the dc control signal of signal amplification unit (3) output; And make its voltage input end and voltage output end conducting through this dc control signal; The voltage input end of switch control unit (4) is electrically connected with the output terminal of voltage conversion unit, two DC voltages of voltage output end output of switch control unit (4);
Signal comparing unit (5) is used for two DC voltages to switch control unit (4) output and compares and export a negative pressure then;
The base stage of transistor Q4 receives signal comparing unit (5) output negative pressure and makes transistor Q4 conducting through this negative pressure;
Relay J K1 is used to control the whether conducting of current supply circuit of primary power and transformer.
2. stand-by circuit according to claim 1; It is characterized in that: described switch control unit (4) comprises NPN type switch triode Q1, positive-negative-positive switch triode Q2; The base stage of Q1 is electrically connected with the output terminal of signal amplification unit; The collector of Q1 is electrically connected with the voltage input end of switch control unit; The grounded emitter of Q1, the base stage of Q2 is electrically connected with the collector of Q1, and the emitter of Q2 is electrically connected with the voltage input end of switch control unit; The collector of Q2 is electrically connected with a delivery outlet of the voltage output end of switch control unit (4), and the voltage input end of switch control unit (4) is electrically connected with another delivery outlet of voltage output end through resistance R 14.
3. stand-by circuit according to claim 2; It is characterized in that: described switch control unit (4) also comprises NPN type switch triode Q3, capacitor C 5 and capacitor C 8; The base stage of Q3 connects respectively at the negative pole of C5, the positive electrical of C8, and the positive pole of C5 is electrically connected with the voltage input end of switch control unit, and the negative pole of C8 is electrically connected with the base stage of Q4; The collector of Q3 is electrically connected with the collector of Q2, the grounded emitter of Q3.
4. stand-by circuit according to claim 1 is characterized in that: described voltage conversion unit (1) is the power supply IC of model LNK605.
5. stand-by circuit according to claim 1 is characterized in that: described input sampling unit (2) is RCA audio input interface CN3.
6. stand-by circuit according to claim 1 is characterized in that: described signal amplification unit (3) is the operational amplifier U1A of model NJM4558.
7. stand-by circuit according to claim 1 is characterized in that: described signal comparing unit (5) is the voltage comparator U1B of model NJM4558.
8. according to claim 4 or 6 or 7 described stand-by circuits, it is characterized in that: described operational amplifier U1A and voltage comparator U1B are integrated into an integrated chip, thereby the output terminal of power supply IC is connected with this integrated chip and is this integrated chip power supply.
9. stand-by circuit according to claim 1 is characterized in that: the coil two ends of described relay J K1 are parallel with a backward dioded D2.
CN201210123678.XA 2012-04-25 2012-04-25 Stand-by circuit Expired - Fee Related CN102645901B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110038862A (en) * 2019-05-23 2019-07-23 厦门华厦学院 A kind of tube cleaning arrangement
CN111679595A (en) * 2020-07-03 2020-09-18 珠海格力电器股份有限公司 Power control circuit, control circuit group and household appliance

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Publication number Priority date Publication date Assignee Title
JPS616986A (en) * 1984-06-20 1986-01-13 Sharp Corp Power supply control system for television sound multiplex adaptor
JPH0795499A (en) * 1993-09-21 1995-04-07 Toshiba Corp Television receiver containing video tape recorder
JP2000032149A (en) * 1998-07-07 2000-01-28 Hitachi Building Systems Co Ltd Operation confirmation device for interphone
CN1358022A (en) * 2002-01-15 2002-07-10 Tcl王牌电子(深圳)有限公司 Automatic control method of testing and outputting audio and video signal
CN101247670A (en) * 2007-02-15 2008-08-20 硕呈科技股份有限公司 Device and method for automatically detecting sound signal to sending control signal
CN201414210Y (en) * 2009-04-15 2010-02-24 河海大学 Device for audio signal detection and automatic speaker power supply control

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS616986A (en) * 1984-06-20 1986-01-13 Sharp Corp Power supply control system for television sound multiplex adaptor
JPH0795499A (en) * 1993-09-21 1995-04-07 Toshiba Corp Television receiver containing video tape recorder
JP2000032149A (en) * 1998-07-07 2000-01-28 Hitachi Building Systems Co Ltd Operation confirmation device for interphone
CN1358022A (en) * 2002-01-15 2002-07-10 Tcl王牌电子(深圳)有限公司 Automatic control method of testing and outputting audio and video signal
CN101247670A (en) * 2007-02-15 2008-08-20 硕呈科技股份有限公司 Device and method for automatically detecting sound signal to sending control signal
CN201414210Y (en) * 2009-04-15 2010-02-24 河海大学 Device for audio signal detection and automatic speaker power supply control

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110038862A (en) * 2019-05-23 2019-07-23 厦门华厦学院 A kind of tube cleaning arrangement
CN110038862B (en) * 2019-05-23 2023-12-26 厦门华厦学院 Pipeline cleaning device
CN111679595A (en) * 2020-07-03 2020-09-18 珠海格力电器股份有限公司 Power control circuit, control circuit group and household appliance

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