CN107453718A - The non-electric current detection trigger protection circuit of power amplifier - Google Patents
The non-electric current detection trigger protection circuit of power amplifier Download PDFInfo
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- CN107453718A CN107453718A CN201710884980.XA CN201710884980A CN107453718A CN 107453718 A CN107453718 A CN 107453718A CN 201710884980 A CN201710884980 A CN 201710884980A CN 107453718 A CN107453718 A CN 107453718A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/444—Diode used as protection means in an amplifier, e.g. as a limiter or as a switch
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Abstract
The non-electric current detection trigger protection circuit of power amplifier; power amplifier cooperative with the non-electric current detection trigger protection circuit of power amplifier, volume gradually big circuit, protection delay circuit, output relay BY1; high current overcurrent protection triggers circuit is provided with described power amplifier, the non-electric current detection trigger protection circuit of described power amplifier includes signal integer circuit, power amplifier status monitor circuit；It is that can drive the DC pulse signals of subordinate's circuit that described signal integer circuit, which is used for the AC pulse short circuit trigger signals integer of power amplifier output,；Described power amplifier status monitor circuit is used to receive the DC pulse signals that described signal integer circuit is sent carry out judging it is normal or short-circuit to power amplifier working condition；Advantage is that effective detection and low-power consumption short-circuit protection are realized to power amplifier, greatly improves equipment life, reduces fault rate, improves product practicality.
Description
Technical field
The present invention relates to audio device circuitry field, the specially non-electric current detection trigger protection circuit of power amplifier.
Background technology
When existing power amplifier has signal voltage output short-circuit for a long time, the protection mechanism routinely used is：Power
Pipe has short circuit current (general 4~7A)-trigger protection Jing Yin, and-power tube is cancelled without short circuit current-protection-(does not take because of short circuit
Disappearing) this circulation continues always, and the time, which has been grown, bears the power tube of short circuit current and can be generated heat because there is power consumption.Consequence is protection
Circuit is unreliable to cause power tube to cross cause thermal damage, and complete machine temperature is higher easily causes other problemses in recycling-guard state.
The content of the invention
The purpose of the present invention is the shortcomings that overcoming above-mentioned prior art, there is provided low-power consumption, long lifespan, reliable and stable work(
Put non-electric current detection trigger protection circuit.
The present invention is achieved through the following technical solutions：
The non-electric current detection trigger protection circuit of power amplifier, with the non-cooperative power amplifier of electric current detection trigger protection circuit of power amplifier
Circuit, volume gradually big circuit, protection delay circuit, output relay BY1, high current excessively stream is provided with described power amplifier and is protected
Triggers circuit is protected, the non-electric current detection trigger protection circuit of described power amplifier includes signal integer circuit, power amplifier condition monitoring
Circuit；It is that can drive subordinate that described signal integer circuit, which is used for the AC pulse short circuit trigger signals integer of power amplifier output,
The DC pulse signals of circuit；Described power amplifier status monitor circuit is used to receive the DC that described signal integer circuit is sent
Pulse signal carries out judging it is normal or short-circuit to power amplifier working condition；Described volume gradually big circuit, power amplifier, defeated
Go out relay BY1 to be sequentially connected and form loop, described protection delay circuit is protected with the high current excessively stream of power amplifier respectively
Shield triggers circuit connected with output relay BY1, described signal integer circuit respectively with volume gradually big circuit, power amplifier and
Power amplifier status monitor circuit, described power amplifier status monitor circuit connect with power amplifier, protection delay circuit respectively
Connect.
As the improvement of such scheme, described signal integer circuit includes diode DP3 negative pole with diode DP4's
Negative pole connection, diode DP4 positive pole be connected with diode DP6 negative pole, the PD5 of diode DP6 positive pole and diode
Positive pole connection, diode DP5 negative pole are connected with diode DP3 positive pole forms loop formation bridge rectification circuit, and described two
Power amplifier described in pole pipe DP4 positive pole access, diode DP3 plus earth；Described NPN triode DP3 negative pole
By accessing NPN triode QP6 base stage after variable resistor RP29, described diode DP5 positive pole passes through variable resistor
NPN triode QP6 base stage is accessed after RP14, described diode DP3 negative pole after resistance R42 by accessing NPN triode
Q8 base stage, described diode DP5 positive pole pass through the base stage of access NPN triode Q8 after resistance R9, the described poles of NPN tri-
Pipe Q8 emitter stage is respectively connected to NPN triode QP6 emitter stage, diode DP5 positive pole, described NPN triode Q8's
Colelctor electrode accesses malleation 15V after passing sequentially through resistance R2, photodiode LED1；Described NPN triode QP6 colelctor electrode
PNP triode QK1 base stage is accessed by resistance RK2, described PNP triode QK1 base stage after resistance RK1 by accessing
Malleation 15V, described PNP triode QK1 emitter stage access malleation 15V, described PNP triode QK1 colelctor electrode pass through
Described volume gradually big circuit is accessed after resistance PM1, described PNP triode QK1 colelctor electrode by being grounded after resistance PM2,
Power amplifier status monitor circuit described in described PNP triode QK1 colelctor electrode access.
As the improvement of such scheme, described power amplifier status monitor circuit includes comparator U1, and the 1 of comparator U1
With No. 7 ports by accessing PNP triode Q9 base stage after resistance R40, comparator U1 No. 2 ports pass sequentially through for number port
Power amplifier is accessed after resistance R47, resistance R46, comparator U1 No. 3 ports and No. 6 ports are respectively connected to a voltage stabilizing electricity
Road；Described PNP triode Q9 base stage by be respectively connected to after resistance R39 positive pole 15V, PNP triode Q9 emitter stage,
The colelctor electrode of NPN triode Q1 5, the base stage of NPN triode Q1 5 by accessing PNP triode QK1 colelctor electrode after resistance R43,
NPN triodes Q15 base stage is followed by being grounded by resistance R36, the positive pole that the base stage of NPN triode Q1 5 passes through diode D5
The colelctor electrode of NPN triode Q1 4 is accessed afterwards, after the base stage of NPN triode Q1 5 passes sequentially through diode D5 positive pole, resistance 11
Access PNP triode Q9 emitter stage, the emitter stage of NPN triode Q1 5 by being grounded after resistance R14, NPN triode Q1 5
Emitter stage is by accessing protection delay circuit after voltage-regulator diode DZ2；PNP triode Q9 colelctor electrode is followed by by resistance R13
Ground, PNP triode Q9 colelctor electrode are grounded after passing sequentially through diode D6 positive pole, resistance R49, PNP triode Q9 current collection
Pole is grounded after passing sequentially through diode D6 positive pole, battery E3 positive pole, and PNP triode Q9 colelctor electrode passes sequentially through diode
The base stage of NPN triode Q1 4, the base stage of NPN triode Q1 4 are accessed after D6 positive pole, the negative pole of voltage-regulator diode, resistance R41
By being grounded after electric capacity C10, the base stage of NPN triode Q1 4 after resistance R50 by being grounded, the transmitting termination of NPN triode Q1 4
Ground.
Power amplifier jumps relay BY1 in any power short circuit for the first time, by the high current protection circuit trigger protection of routine
Cut-out output but short circuit does not cancel always, power amplifier protection revocation after short circuit current disappears 5 seconds, by repetitive cycling protection act,
Second of trigger protection is just partially completed principles by this:Relay BY1 closures connect load during power amplifier protection revocation, and volume is gradually
The small volume signal that big circuit starts to be gradually increased is to power amplifier, now short-circuit always due to loading, comparator U1 no signals
Q14 can not be then turned on, for power amplifier under minimum short circuit current 0.05A or so, Q15 cans allow protection signal caused by power amplifier to cut
Load behind disconnected output relay, so as to be always the do action of " protection-revocation protection " of low-power consumption below, without load
Heart power consumption is excessive and damages device.
Power amplifier itself dc point disequilibrium-power amplifier itself when power output stage has minute shorting current (milliampere level)
Distortion detection circuit have output (this circuit function be usually to CLIP LED instruction and distortion automatic growth control use
)-compared using this signal and power amplifier output level amplitude in comparator U1 circuits and (design normal output amplitude voltage to lead
The distorted signal of cause will not trigger protection signal output, but the distortion for also having when output end is without normal output voltage power amplifier is believed
Number come when, comparator, which is judged as output, short circuit)-realize that micro energy lose trigger protection is Jing Yin.
The invention has the advantages that：Effective detection and low-power consumption short-circuit protection are realized to power amplifier, is carried significantly
High equipment life, fault rate is reduced, improve product practicality.
Brief description of the drawings
Fig. 1 is the circuit structure schematic diagram of the present invention.
Embodiment
As shown in figure 1, the non-electric current detection trigger protection circuit of power amplifier, common with the non-electric current detection trigger protection circuit of power amplifier
The power amplifier of work, volume gradually big circuit, protection delay circuit, output relay BY1, it is provided with described power amplifier big
Overcurrent protects triggers circuit, and the non-electric current detection trigger protection circuit of described power amplifier includes signal integer circuit, power amplifier electricity
Line state supervisory circuit；Described signal integer circuit is used for
The DC pulse signals of subordinate's circuit can be driven；Described power amplifier status monitor circuit is used to receive described signal integer electricity
The DC pulse signals that road is sent carry out judging it is normal or short-circuit to power amplifier working condition；Described volume gradually big circuit,
Power amplifier, output relay BY1 are sequentially connected and form loop, and described protection delay circuit is big with power amplifier respectively
Overcurrent protection triggers circuit connected with output relay BY1, described signal integer circuit respectively with volume gradually big circuit,
Power amplifier and power amplifier status monitor circuit, described power amplifier status monitor circuit respectively with power amplifier, protection
Delay circuit connects.The negative pole that described signal integer circuit includes diode DP3 is connected with diode DP4 negative pole, two poles
Pipe DP4 positive pole is connected with diode DP6 negative pole, the connection of the PD5 of diode DP6 positive pole and diode positive pole, two poles
Pipe DP5 negative pole is connected composition loop with diode DP3 positive pole and forms bridge rectification circuit, described diode DP4 positive pole
The described power amplifier of access, diode DP3 plus earth；Described NPN triode DP3 negative pole passes through variable resistor
NPN triode QP6 base stage is accessed after RP29, described diode DP5 positive pole after variable resistor RP14 by accessing NPN
Triode QP6 base stage, described diode DP3 negative pole are described by accessing NPN triode Q8 base stage after resistance R42
Diode DP5 positive pole pass through the base stage that NPN triode Q8 is accessed after resistance R9, described NPN triode Q8 emitter stage
NPN triode QP6 emitter stage, diode DP5 positive pole are respectively connected to, described NPN triode Q8 colelctor electrode leads to successively
Malleation 15V is accessed after crossing resistance R2, photodiode LED1；Described NPN triode QP6 colelctor electrode is connect by resistance RK2
Enter PNP triodes QK1 base stage, described PNP triode QK1 base stage is described by access malleation 15V after resistance RK1
PNP triode QK1 emitter stage access malleation 15V, described PNP triode QK1 colelctor electrode after resistance PM1 by accessing institute
The volume stated gradually big circuit, described PNP triode QK1 colelctor electrode after resistance PM2 by being grounded, described PNP triode
Power amplifier status monitor circuit described in QK1 colelctor electrode access.Described power amplifier status monitor circuit includes comparing
Device U1, comparator U1 No. 1 port are with No. 7 ports by accessing PNP triode Q9 base stage, comparator U1 after resistance R40
No. 2 ports pass sequentially through power amplifier accessed after resistance R47, resistance R46, comparator U1 No. 3 ports are distinguished with No. 6 ports
Access a mu balanced circuit；Described PNP triode Q9 base stage is by being respectively connected to the pole of positive pole 15V, PNP tri- after resistance R39
Pipe Q9 emitter stage, the colelctor electrode of NPN triode Q1 5, the base stage of NPN triode Q1 5 is by accessing the poles of PNP tri- after resistance R43
Pipe QK1 colelctor electrode, the base stage of NPN triode Q1 5 are followed by being grounded by resistance R36, and the base stage of NPN triode Q1 5 passes through two
The colelctor electrode of NPN triode Q1 4 is accessed after pole pipe D5 positive pole, the base stage of NPN triode Q1 5 passes sequentially through diode D5's
PNP triode Q9 emitter stage is accessed after positive pole, resistance 11, the emitter stage of NPN triode Q1 5 by being grounded after resistance R14,
The emitter stage of NPN triode Q1 5 is by accessing protection delay circuit after voltage-regulator diode DZ2；PNP triodes Q9 colelctor electrode
By being grounded after resistance R13, PNP triode Q9 colelctor electrode is grounded after passing sequentially through diode D6 positive pole, resistance R49, PNP
Triode Q9 colelctor electrode is grounded after passing sequentially through diode D6 positive pole, battery E3 positive pole, PNP triode Q9 colelctor electrode
Pass sequentially through the base stage that NPN triode Q1 4 is accessed after diode D6 positive pole, the negative pole of voltage-regulator diode, resistance R41, NPN tri-
Pole pipe Q14 base stage after electric capacity C10 by being grounded, and the base stage of NPN triode Q1 4 after resistance R50 by being grounded, the poles of NPN tri-
Pipe Q14 transmitting terminal ground connection.
Operation principle：Power amplifier itself dc point loses flat when power output stage has minute shorting current (milliampere level)
Weighing apparatus-power amplifier distortion detection circuit of itself has output, and (this circuit function is increased automatically to CLIP LED instructions and distortion
Beneficial control)-compared using this signal and power amplifier output level amplitude in comparator U1 circuits and (design normal output width
Distorted signal caused by spending voltage will not trigger protection signal output, but also have power amplifier when output end is without normal output voltage
Distorted signal when coming, comparator, which is judged as output, short circuit)-realize that micro energy lose trigger protection is Jing Yin.
Signal integer circuit operation principle：DP3, DP4, DP5, DP6 form bridge rectification circuit, and the AC pulses that power amplifier is come are short
Road trigger signal integer is DC pulse signals, and QP6, QK1 amplify DC pulse signals, is easy to drive subordinate circuit
Power amplifier status monitor circuit：VR1, VR2 set +/- 1v and do benchmark to U1 double-limit comparator circuits, and R46 is defeated
Enter the output signal .R43 from power amplifier and input the DC pulse signals that Fig. 1 QK1 come, U1 1 to No. 7 port output state judges electricity
Pressure, Q9 and Q14 composition DC buffer switch, state execution circuit, of-state voltage is done current buffering and handled by Q15 to be held to rear class
Row instruction completes working condition with and judges
Normal condition:QK1 can produce DC signals to distortion in normal use when reaching the voltage of peak power output
Limit magnitude circuit (distortion limitation circuit, prevents output signal from excessively cutting top damage loudspeaker), normal operating conditions, at this moment power amplifier
It is that can not be protected
Short-circuit condition:When power amplifier exports terminal shortcircuit (the OU3 ends PG short circuits over the ground for being defined as BY1), R46 is just not greater than 1V
Low level -15V.s of No. 7 of the .U1 ends of signal input when can not just keep exporting normal use just overturn be changed into high level+
15V, Q9 below, Q14 no-biases enter cut-off, R43 input QK1 come DC pulse signals can then be exported through Q15-E poles to
Subordinate's circuit enters guard mode, finally allows BY1 to disconnect OU3, short circuit is with regard to disappearance
Above-listed detailed description is illustrating for possible embodiments of the present invention, and the embodiment simultaneously is not used to limit this hair
Bright the scope of the claims, all equivalence enforcements or change without departing from carried out by the present invention, it is intended to be limited solely by the scope of the claims of this case.
Claims (3)
1. the non-electric current detection trigger protection circuit of power amplifier, power amplifier electricity cooperative with the non-electric current detection trigger protection circuit of power amplifier
Road, volume gradually big circuit, protection delay circuit, output relay BY1, are provided with high current overcurrent protection in described power amplifier
Triggers circuit, it is characterised in that the non-electric current detection trigger protection circuit of described power amplifier includes signal integer circuit, power amplifier
Status monitor circuit；The AC pulse short circuit trigger signals integer that described signal integer circuit is used to export power amplifier is can
Drive the DC pulse signals of subordinate's circuit；Described power amplifier status monitor circuit is used to receive described signal integer circuit
The DC pulse signals sent carry out judging it is normal or short-circuit to power amplifier working condition；Described volume gradually big circuit, work(
Electric discharge road, output relay BY1 are sequentially connected and form loop, the described protection delay circuit big electricity with power amplifier respectively
Stream overcurrent protection triggers circuit connects with output relay BY1, described signal integer circuit respectively with volume gradually big circuit, work(
Discharge road and power amplifier status monitor circuit,
Described power amplifier status monitor circuit is connected with power amplifier, protection delay circuit respectively.
2. the non-electric current detection trigger protection circuit of power amplifier according to claim 1, it is characterised in that described signal integer
The negative pole that circuit includes diode DP3 is connected with diode DP4 negative pole, the negative pole of diode DP4 positive pole and diode DP6
The PD5 of connection, diode DP6 positive pole and diode positive pole connection, the positive pole of diode DP5 negative pole and diode DP3
Connection composition loop forms bridge rectification circuit, the power amplifier described in described diode DP4 positive pole access, diode DP3
Plus earth；Described NPN triode DP3 negative pole by accessing NPN triode QP6 base stage after variable resistor RP29,
Described diode DP5 positive pole passes through the base stage of access NPN triode QP6 after variable resistor RP14, described diode DP3
Negative pole be followed by by accessing NPN triode Q8 base stage, described diode DP5 positive pole after resistance R42 by resistance R9
Enter NPN triode Q8 base stage, described NPN triode Q8 emitter stage is respectively connected to NPN triode QP6 emitter stage, two
Pole pipe DP5 positive pole, described NPN triode Q8 colelctor electrode access just after passing sequentially through resistance R2, photodiode LED1
Press 15V；Described NPN triode QP6 colelctor electrode accesses PNP triode QK1 base stage, described PNP tri- by resistance RK2
Pole pipe QK1 base stage accesses malleation 15V by accessing malleation 15V, described PNP triode QK1 emitter stage after resistance RK1,
Described PNP triode QK1 colelctor electrode is by accessing described volume gradually big circuit, described PNP triode after resistance PM1
QK1 colelctor electrode after resistance PM2 by being grounded, the power amplifier state described in described PNP triode QK1 colelctor electrode access
Supervisory circuit.
3. the non-electric current detection trigger protection circuit of power amplifier according to claim 2, it is characterised in that described power amplifier
Status monitor circuit includes comparator U1, and comparator U1 No. 1 port and No. 7 ports pass through access PNP tri- poles after resistance R40
Pipe Q9 base stage, comparator U1 No. 2 ports, which pass sequentially through, accesses power amplifier after resistance R47, resistance R46, and the 3 of comparator U1
Number port is respectively connected to a mu balanced circuit with No. 6 ports；Described PNP triode Q9 base stage after resistance R39 by distinguishing
Positive pole 15V, PNP triode Q9 emitter stage, the colelctor electrode of NPN triode Q1 5 are accessed, the base stage of NPN triode Q1 5 passes through electricity
PNP triode QK1 colelctor electrode is accessed after resistance R43, the base stage of NPN triode Q1 5 is followed by being grounded by resistance R36, the poles of NPN tri-
Access the colelctor electrode of NPN triode Q1 4 after the positive pole that pipe Q15 base stage passes through diode D5, the base stage of NPN triode Q1 5 according to
PNP triode Q9 emitter stage is accessed after secondary positive pole by diode D5, resistance 11, the emitter stage of NPN triode Q1 5 passes through
It is grounded after resistance R14, the emitter stage of NPN triode Q1 5 is by accessing protection delay circuit after voltage-regulator diode DZ2；The poles of PNP tri-
For pipe Q9 colelctor electrode by being grounded after resistance R13, PNP triode Q9 colelctor electrode passes sequentially through diode D6 positive pole, resistance
It is grounded after R49, PNP triode Q9 colelctor electrode is grounded after passing sequentially through diode D6 positive pole, battery E3 positive pole, PNP tri-
Pole pipe Q9 colelctor electrode accesses NPN triode after passing sequentially through diode D6 positive pole, the negative pole of voltage-regulator diode, resistance R41
Q14 base stage, the base stage of NPN triode Q1 4 after electric capacity C10 by being grounded, after the base stage of NPN triode Q1 4 is by resistance R50
Ground connection, the transmitting terminal ground connection of NPN triode Q1 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710884980.XA CN107453718B (en) | 2017-09-26 | 2017-09-26 | Non-current triggering detection protection circuit of power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710884980.XA CN107453718B (en) | 2017-09-26 | 2017-09-26 | Non-current triggering detection protection circuit of power amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107453718A true CN107453718A (en) | 2017-12-08 |
| CN107453718B CN107453718B (en) | 2023-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710884980.XA Active CN107453718B (en) | 2017-09-26 | 2017-09-26 | Non-current triggering detection protection circuit of power amplifier |
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| CN107453718B (en) | 2023-05-16 |
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