CN206546404U - A kind of level pressure power amplifier short-circuit detecting circuit based on comparator - Google Patents
A kind of level pressure power amplifier short-circuit detecting circuit based on comparator Download PDFInfo
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- CN206546404U CN206546404U CN201720262695.XU CN201720262695U CN206546404U CN 206546404 U CN206546404 U CN 206546404U CN 201720262695 U CN201720262695 U CN 201720262695U CN 206546404 U CN206546404 U CN 206546404U
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Abstract
The utility model discloses a kind of level pressure power amplifier short-circuit detecting circuit based on comparator of power amplifier technical field, including isolating transformer B1, one and No. two port of the isolating transformer B1 is serially connected with 120 volts and zero volts input respectively, four and No. three ports of the isolating transformer B1 are serially connected with rectifier bridge Br1 one and No. two port respectively, this circuit output is on-off model, it can export to single-chip microcomputer through logic judgment, by protection under mcs control circuit operation after software filtering, protection circuit action can also be directly driven, concrete scheme is that output voltage sampling is introduced on the basis of common circuit, and improved according to the characteristics of power amplifier output short-circuit, make detection circuit sensitiveer, simultaneously because there is provided biasing circuit, positive-feedback circuit makes this part detect that circuit is more stable, it it also avoid fault signal occur.
Description
Technical field
The utility model is related to power amplifier technical field, specially a kind of level pressure power amplifier short-circuit detecting based on comparator
Circuit.
Background technology
Fire broadcast system is also emergency broadcase system, is the visual plant of fire disaster escaping evacuation and fire fighting command, whole
Effect of crucial importance is played in individual fire-fighting Control management system, when fire occurs, emergent broadcast signal is sent out by audiogenic device
Go out, after power amplification, the audio amplifier for being switched to broadcast designated area by broadcast handover module realizes emergent broadcast, and general disappears
Anti- broadcast system is main by device at host machine end, audiogenic device, broadcast power amplifier, fire alarm control unit (linkage type) etc., and scene
Equipment such as output module and audio amplifier are constituted, and output stage short trouble occur inside fire broadcast power amplifier, it is therefore desirable to detect
Circuit detects inside fire broadcast power amplifier whether occur short circuit, therefore, I proposes that a kind of level pressure power amplifier based on comparator is short
Alignment detection circuit.
Utility model content
The purpose of this utility model is to provide a kind of level pressure power amplifier short-circuit detecting circuit based on comparator, with solution
The problem of stating the need for being proposed in background technology to carrying out short-circuit detecting inside broadcast power amplifier.
To achieve the above object, the utility model provides following technical scheme：A kind of level pressure power amplifier based on comparator is short
Alignment detection circuit, including isolating transformer B1, the isolating transformer B1 one and No. two port are serially connected with 120 respectively
Volt and zero volts input, four and No. three ports of the isolating transformer B1 are serially connected with one and No. two of rectifier bridge Br1 respectively
Port, No. four ports of the rectifier bridge Br1 are simultaneously connected to electrochemical capacitor E1 positive poles, electric capacity C1, resistance R1 and resistance R2, the electricity
Solution electric capacity E1 negative pole is simultaneously connected to rectifier bridge Br1 No. three ports, the electric capacity C1 other ends, the resistance R1 other ends, voltage-regulator diode
DZ1 positive poles, ground wire and resistance R3, the other end of the resistance R2 and be connected to voltage-regulator diode DZ1 negative pole, resistance R3 it is another
End, No. five ports of amplifier U1B, electrochemical capacitor E5 negative poles, resistance R6 and R7, the resistance R6 other ends and electrochemical capacitor E5 are just
Extremely it is serially connected with VCC inputs, the other end of the resistance R7 and No. seven ports and output A ports for being connected to amplifier U1B, the fortune
Put U1B No. six ports and be connected to resistance R5 and electrochemical capacitor E4 positive poles, the other end of the resistance R5 is simultaneously connected to resistance R4, two
Pole pipe D1 negative poles and electrochemical capacitor E3 positive poles, the positive pole of the diode D1 and to be connected to electrochemical capacitor E2 positive poles and diode D2 negative
Pole, the negative pole of the electrochemical capacitor E2 is simultaneously connected to triode T1 emitter stages and resistance RX1, and the other end of the resistance RX1 simultaneously connects
There are diode D2 positive pole, electrochemical capacitor E3 negative pole, the resistance R4 other ends, ground wire and electrochemical capacitor E4 negative pole.
It is preferred that, the resistance RX1 is wire-wound resistor.
It is preferred that, the rectifier bridge Br1 is full-bridge rectification.
Compared with prior art, the beneficial effects of the utility model are：By resistance RX1 be wire-wound resistor, working stability,
Heat resistance is good, and error range is small, and resistance can be accurate to 0.001 Europe, and this circuit output is on-off model, can be exported to list
Piece machine, by protection under mcs control circuit operation, can also directly drive protection circuit action after logic judgment, software filtering,
Concrete scheme is that output voltage sampling is introduced on the basis of common circuit, and is improved according to the characteristics of power amplifier output short-circuit,
Make detection circuit sensitiveer, simultaneously because there is provided biasing circuit, positive-feedback circuit make this part detect circuit it is more stable, also keep away
Exempt from fault signal occur.
Brief description of the drawings
Fig. 1 is the utility model circuit diagram.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
Referring to Fig. 1, the utility model provides a kind of technical scheme：A kind of level pressure power amplifier short-circuit detecting based on comparator
Circuit, including isolating transformer B1, the isolating transformer B1 one and No. two port are serially connected with 120 volts and zero respectively
Control source is lied prostrate, four and No. three ports of the isolating transformer B1 are serially connected with rectifier bridge Br1 one and No. two port, institute respectively
State rectifier bridge Br1 No. four ports and be connected to electrochemical capacitor E1 positive poles, electric capacity C1, resistance R1 and resistance R2, the electrochemical capacitor
E1 negative pole is simultaneously connected to rectifier bridge Br1 No. three ports, the electric capacity C1 other ends, the resistance R1 other ends, voltage-regulator diode DZ1 just
Pole, ground wire and resistance R3, the other end of the resistance R2 are simultaneously connected to voltage-regulator diode DZ1 negative pole, the resistance R3 other end, fortune
No. five ports of U1B, electrochemical capacitor E5 negative poles, resistance R6 and R7 are put, the positive pole of the resistance R6 other ends and electrochemical capacitor E5 is equal
It is serially connected with VCC inputs, the other end of the resistance R7 and No. seven ports and output A ports for being connected to amplifier U1B, the amplifier
U1B No. six ports are simultaneously connected to resistance R5 and electrochemical capacitor E4 positive poles, and the other end of the resistance R5 is simultaneously connected to resistance R4, two poles
Pipe D1 negative poles and electrochemical capacitor E3 positive poles, the positive pole of the diode D1 and to be connected to electrochemical capacitor E2 positive poles and diode D2 negative
Pole, the negative pole of the electrochemical capacitor E2 is simultaneously connected to triode T1 emitter stages and resistance RX1, and the other end of the resistance RX1 simultaneously connects
There are diode D2 positive pole, electrochemical capacitor E3 negative pole, the resistance R4 other ends, ground wire and electrochemical capacitor E4 negative pole.
Wherein, the resistance RX1 is wire-wound resistor, and working stability, heat resistance is good, and error range is small, and resistance can be accurate
To 0.001 Europe, the rectifier bridge Br1 is full-bridge rectification.
Operation principle：Top half is that level pressure is sampled to output voltage in the circuit, and output voltage is through isolating transformation
After device B1, rectifier bridge Br1, electrochemical capacitor E1 and electric capacity C1 rectifying and wave-filterings, No. five of amplifier U1B are connected to through resistance R2 and R3 partial pressure
Port, when output voltage is raised, partial pressure value rises；When output voltage is reduced, partial pressure value declines, and the latter half is left in circuit
Side is output driving triode T1 and emitter resistance RX1, and right side circuit is sampled to emitter resistance RX1 electric current, electricity
Resistance RX1 is wire-wound resistor, and the pressure drop of its top and triode T1 collector current are in direct ratio, by electrochemical capacitor E2, two poles
The voltage doubling rectifing circuit of pipe D1, diode D2 and electrochemical capacitor E3 compositions is carried out after rectifying and wave-filtering to AC wave shape on resistance RX1
Amplifier U1B No. six ports are connected to, when output current increases, voltage rises；When output current is reduced, voltage declines, electricity
R6 and electrochemical capacitor E5 composition positive input biasing circuits are hindered, when power amplifier is in holding state, amplifier U1B output ends are prevented
State is not known, simultaneously because electrochemical capacitor E5 setting, when powered on moment electrochemical capacitor E5 both end voltages can not be mutated, amplifier
U1B No. five port voltages are close to input VCC, it is to avoid powered on moment amplifier U1B output error fault-signals, resistance R7 is just
To feedback resistance, amplifier U1B is changed to hysteresis amplifier, increase detection circuit stability, when power amplifier output short-circuit by singly limiting amplifier
When, output voltage declines, operating current rises, and amplifier U1B is reversed to low level driving by normality output high level and is followed by circuit.
While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art,
It is appreciated that these embodiments can be carried out in the case where not departing from principle of the present utility model and spirit a variety of changes, repaiies
Change, replace and modification, scope of the present utility model is defined by the appended claims and the equivalents thereof.
Claims (3)
1. a kind of level pressure power amplifier short-circuit detecting circuit based on comparator, including isolating transformer B1, it is characterised in that：It is described every
One and No. two port from transformer B1 is serially connected with 120 volts and zero volts input respectively, the isolating transformer B1's
Four and No. three ports are serially connected with rectifier bridge Br1 one and No. two port respectively, and No. four ports of the rectifier bridge Br1 are simultaneously connected to electricity
Solve electric capacity E1 positive poles, electric capacity C1, resistance R1 and resistance R2, the negative pole of the electrochemical capacitor E1 is simultaneously connected to No. three of rectifier bridge Br1
Port, the electric capacity C1 other ends, the resistance R1 other ends, voltage-regulator diode DZ1 positive poles, ground wire and resistance R3, the resistance R2's is another
One end and be connected to voltage-regulator diode DZ1 negative pole, the resistance R3 other end, No. five ports of amplifier U1B, electrochemical capacitor E5 negative poles,
Resistance R6 and R7, the positive pole of the resistance R6 other ends and electrochemical capacitor E5 are serially connected with VCC inputs, and the resistance R7's is another
Amplifier U1B No. seven ports and output A ports are held and are connected to, No. six ports of the amplifier U1B are simultaneously connected to resistance R5 and electrolysis
Electric capacity E4 positive poles, the other end of the resistance R5 is simultaneously connected to resistance R4, diode D1 negative poles and electrochemical capacitor E3 positive poles, described two
Pole pipe D1 positive pole is simultaneously connected to electrochemical capacitor E2 positive poles and diode D2 negative poles, and the negative pole of the electrochemical capacitor E2 is simultaneously connected to three poles
Pipe T1 emitter stages and resistance RX1, the other end of the resistance RX1 and be connected to diode D2 positive pole, electrochemical capacitor E3 negative pole,
The negative pole of the resistance R4 other ends, ground wire and electrochemical capacitor E4.
2. a kind of level pressure power amplifier short-circuit detecting circuit based on comparator according to claim 1, it is characterised in that：It is described
Resistance RX1 is wire-wound resistor.
3. a kind of level pressure power amplifier short-circuit detecting circuit based on comparator according to claim 1, it is characterised in that：It is described
Rectifier bridge Br1 is full-bridge rectification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720262695.XU CN206546404U (en) | 2017-03-17 | 2017-03-17 | A kind of level pressure power amplifier short-circuit detecting circuit based on comparator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720262695.XU CN206546404U (en) | 2017-03-17 | 2017-03-17 | A kind of level pressure power amplifier short-circuit detecting circuit based on comparator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206546404U true CN206546404U (en) | 2017-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720262695.XU Active CN206546404U (en) | 2017-03-17 | 2017-03-17 | A kind of level pressure power amplifier short-circuit detecting circuit based on comparator |
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| CN (1) | CN206546404U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031101A (en) * | 2018-08-13 | 2018-12-18 | 上海艾为电子技术股份有限公司 | A kind of volume production test circuit of power amplifier AGC output power |
| CN115032567A (en) * | 2022-08-15 | 2022-09-09 | 南通江海电容器股份有限公司 | Electrolytic capacitor short circuit detection system |
-
2017
- 2017-03-17 CN CN201720262695.XU patent/CN206546404U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031101A (en) * | 2018-08-13 | 2018-12-18 | 上海艾为电子技术股份有限公司 | A kind of volume production test circuit of power amplifier AGC output power |
| CN115032567A (en) * | 2022-08-15 | 2022-09-09 | 南通江海电容器股份有限公司 | Electrolytic capacitor short circuit detection system |
| CN115032567B (en) * | 2022-08-15 | 2022-11-04 | 南通江海电容器股份有限公司 | Electrolytic capacitor short circuit detection system |
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Address after: 050000 building 7, area a, Optical Valley Science Park, 99 Yuyuan Road, Luquan District, Shijiazhuang City, Hebei Province Patentee after: Shijiazhuang Kaituo Electronic Technology Co.,Ltd. Address before: 050299 building 7, area a, Optical Valley Science Park, 99 Yuyuan Road, Luquan District, Shijiazhuang City, Hebei Province Patentee before: SHIJIAZHUANG KAITUO ELECTRONIC TECHNOLOGY ENGINEERING Co. |