CN111864713A - Overvoltage protection device for high pitch loudspeaker - Google Patents
Overvoltage protection device for high pitch loudspeaker Download PDFInfo
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- CN111864713A CN111864713A CN202010832285.0A CN202010832285A CN111864713A CN 111864713 A CN111864713 A CN 111864713A CN 202010832285 A CN202010832285 A CN 202010832285A CN 111864713 A CN111864713 A CN 111864713A
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- Prior art keywords
- frequency divider
- overvoltage protection
- high pitch
- resistor
- pitch frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/007—Protection circuits for transducers
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses an overvoltage protection device for a high pitch loudspeaker, which comprises an audio power amplifier, a high pitch frequency divider module and a low pitch frequency divider module, wherein an audio signal is input to the audio power amplifier through a wiring terminal, the high pitch frequency divider module and the low pitch frequency divider module are both connected with the output end of the audio power amplifier, the high pitch frequency divider module is connected with the high pitch loudspeaker, the low pitch frequency divider module is connected with the low pitch loudspeaker, and the overvoltage protection device also comprises an overvoltage protection control module, wherein the overvoltage protection control module comprises a bridge rectifier circuit, a load resistor, a divider resistor, a charging capacitor, a discharging resistor and an MOS (metal oxide semiconductor) tube.
Description
Technical Field
The invention relates to the technical field of protection circuits, in particular to an overvoltage protection device for a high pitch loudspeaker.
Background
Often the audio power amplifier output power is too big is met and is led to damaging the high pitch loudspeaker to the audio amplifier of audio amplifier in the in-process of using, for example: when designing a tweeter with a power rating (PO) of 75W/8 Ω and an output voltage of 24.5V at its maximum, the tweeter will not be able to withstand such a large power when the power amplifier output >24.5V, for example 35V/8 Ω 153W, has exceeded its power rating.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide an overvoltage protection device for a high pitch loudspeaker, which is controlled within a rated power range through the output of the high pitch loudspeaker, so that the high pitch loudspeaker can work stably.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a high pitch loudspeaker overvoltage protector, includes audio power amplifier, high pitch frequency divider module and bass frequency divider module, audio signal pass through binding post input extremely audio power amplifier, high pitch frequency divider module and bass frequency divider module all are connected with audio power amplifier's output, just be connected with high pitch loudspeaker on the high pitch frequency divider module, be connected with woofer on the bass frequency divider module, still include overvoltage protection control module, overvoltage protection control module includes bridge rectifier circuit, load resistor, divider resistor, charging capacitor, discharge resistor and MOS pipe, one of them AC input of bridge rectifier circuit connects between high pitch frequency divider module and high pitch loudspeaker, and another one AC input of bridge rectifier circuit ground connection, bridge rectifier circuit's positive pole in proper order with load resistor's one end, bass frequency divider module, One end of the divider resistor is connected with the D pole of the MOS tube, the other end of the load resistor is connected with the negative pole of the bridge rectifier circuit, the other end of the divider resistor is connected with one end of the charging resistor and the G pole of the MOS tube respectively, the other end of the charging resistor is connected with the positive pole of the charging capacitor, the negative pole of the charging capacitor and the S pole of the MOS tube are connected with the negative pole of the bridge rectifier circuit, and the discharging resistor is connected with the two ends of the charging capacitor in parallel.
In a preferred embodiment, the current input terminal of the charging resistor is provided with an anti-reverse diode.
In another preferred embodiment, a voltage stabilizing diode is arranged between the G pole and the S pole of the MOS transistor.
In another preferred embodiment, the MOS transistor is an NMOS transistor.
The invention has the beneficial effects that:
according to the invention, overvoltage protection detection of the high pitch loudspeaker can be realized only by using simple electronic components such as an MOS tube, a diode, a resistor, a capacitor and the like, stable and reliable work of the high pitch loudspeaker can be ensured, the service life is prolonged, after-sale maintenance cost is reduced, and huge economic benefits are brought to enterprises.
Drawings
Fig. 1 is a schematic circuit diagram according to an embodiment of the present invention.
Reference numerals: 1. audio power amplifier, 2, high pitch frequency divider module, 3, bass frequency divider module, 4, high pitch loudspeaker, 5, woofer, 6, overvoltage protection control module.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
As shown in fig. 1, a tweeter overvoltage protection device, including audio power amplifier 1, high pitch frequency divider module 2 and bass frequency divider module 3, audio signal passes through binding post JK1 to input to audio power amplifier 1, high pitch frequency divider module 2 and bass frequency divider module 3 all are connected with audio power amplifier 1's output, and be connected with tweeter 4 on the high pitch frequency divider module 2, be connected with woofer 5 on the bass frequency divider module 3, still include overvoltage protection control module 6, overvoltage protection control module 6 includes bridge rectifier circuit, load resistance R9, divider resistance R12, charging resistor R11, charging capacitor C5, discharging resistor R10 and MOS pipe Q1, one of them ac input end of bridge rectifier circuit connects between high pitch frequency divider module 2 and tweeter 4, the other alternating current input end of the bridge rectifier circuit is grounded, the positive electrode of the bridge rectifier circuit is sequentially connected with one end of the load resistor R9, one end of the voltage dividing resistor R12 and the D electrode of the MOS tube Q1, the other end of the load resistor R9 is connected with the negative electrode of the bridge rectifier circuit, the other end of the voltage dividing resistor R12 is respectively connected with one end of the charging resistor R11 and the G electrode of the MOS tube Q1, the other end of the charging resistor R11 is connected with the positive electrode of the charging capacitor C5, the negative electrode of the charging capacitor C5 and the S electrode of the MOS tube Q1 are both connected with the negative electrode of the bridge rectifier circuit, and the discharging resistor R10 is connected to the two ends of the charging capacitor C5 in parallel.
In this embodiment, the current input terminal of the charging resistor R11 is provided with an anti-reverse diode D5.
In this embodiment, a zener diode ZD1 is disposed between the G pole and the S pole of the MOS transistor Q1.
In this embodiment, the MOS transistor Q1 is an NMOS transistor.
The working principle of the present embodiment is further described as follows:
the power amplifier 1: amplifying the voltage and the current of the small signal to achieve the purpose of pushing the sound box; high pitch frequency divider module 2: passing frequencies above 2.5khz, and filtering frequencies below 2.5 khz; bass frequency divider module 3: frequencies below 2.5khz are passed through and frequencies above 2.5khz are filtered out.
Referring to fig. 1 again, during design, for example, the voltage at point a is the output power of the power amplifier 1
The B point value is the rated power of the high pitch loudspeaker 4 obtained by current limiting and voltage dividing of a frequency division network consisting of a capacitor C4, a capacitor C3, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and an inductor L4 and a 48 omega load of the high pitch loudspeaker
I.e. an output voltage of 24.5V has been determined.
A bridge rectifier circuit is formed by the rectifier diode D1, the rectifier diode D2, the rectifier diode D3 and the rectifier diode D4, the direct-current voltage obtained after bridge rectification is 24.5V-1.2V-23.3V which is the voltage at the point C, and the voltage drop of the bridge rectifier is 1.2V because no filter capacitor is used for filtering.
The voltage at the point G is obtained by dividing the voltage at the point C through a voltage dividing resistor R12, an anti-reverse diode D5, a charging resistor R11 and a discharging resistor R10, and when the voltage at the point G reaches the driving voltage of a MOS transistor Q1: vGSAnd (th) is 3-5V, the DS pole of the MOS transistor Q1 is conducted.
The voltage of the point G is charged to a charging resistor R11 and a charging capacitor C5 through an anti-reverse diode D5, the charging time is R11 multiplied by C5, the charging capacitor C5 discharges through a discharging resistor R10, and the discharging time is C5 multiplied by R11; the zener diode ZD1 plays a role in protecting the MOS transistor Q1 from an excessively high G-voltage.
MOS transistor Q1 driving voltage VGSWhen (th) is equal to 4V, the DS pole is on, a current (I) is formed across the load resistor R9, and the voltage at point C ÷ the current (I) across the load resistor R9 is equal to the resistance of the DS pole on. Such as: the voltage at point C is 23.3V ÷ R9, and the current (I) across the terminals 2.1A ═ 11 Ω.
When the input power is more than 200W, the voltage of the point A rises, the voltage of the point B rises, the voltage of the point C rises, and the MOS tube Q1 drives the voltage VGS(th) when the voltage rises, the conduction resistance value of the DS pole is reduced, the larger the current formed at the two ends of the load resistor R9 is, and the current is added to the positive end and the negative end of the bridge rectifier to play a role in limiting and protecting; therefore, parameters of the discharge resistor R10, the charge resistor R11, and the voltage divider resistor R12 may be adjusted according to different powers of the tweeter 4.
The specific control principle is as follows:
the power amplifier 1 outputs signals to the high-pitch frequency divider module 2 for frequency division, the signals are rectified by the bridge rectifier circuit and then pass through the load resistor R9 to the divider resistor R12 to provide conducting voltage for the GS pole of the MOS tube Q1, the voltage stabilizing diode ZD1 prevents the GS pole voltage of the MOS tube Q1 from being too high, the DS pole of the MOS tube Q1 is conducted, and then the voltage of the high-pitch loudspeaker 4 is reduced through the rectifier diode D1, the rectifier diode D2, the rectifier diode D3 and the rectifier diode D4 of the bridge rectifier circuit, so that the overvoltage protection effect is achieved. The charging resistor R11 and the charging capacitor C5 are charged through the anti-reverse diode D5, and the charging capacitor C5 discharges through the discharging resistor R10. The slower the charging time, the slower the time to turn on the DS pole of the MOS transistor Q1, and the slower the overvoltage protection action. When the charging time is faster, the time for making the DS pole of the MOS transistor Q1 conductive is faster, and the overvoltage protection action is faster.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (4)
1. An overvoltage protection device for a high pitch loudspeaker comprises an audio power amplifier, a high pitch frequency divider module and a low pitch frequency divider module, wherein an audio signal is input to the audio power amplifier through a wiring terminal, the high pitch frequency divider module and the low pitch frequency divider module are both connected with the output end of the audio power amplifier, the high pitch frequency divider module is connected with the high pitch loudspeaker, the low pitch frequency divider module is connected with the low pitch loudspeaker, the overvoltage protection device is characterized by further comprising an overvoltage protection control module, the overvoltage protection control module comprises a bridge rectifier circuit, a load resistor, a divider resistor, a charging capacitor, a discharging resistor and an MOS (metal oxide semiconductor) tube, one alternating current input end of the bridge rectifier circuit is connected between the high pitch frequency divider module and the high pitch loudspeaker, and the other alternating current input end of the bridge rectifier, bridge rectifier circuit ' S positive pole in proper order with load resistance ' S one end, divider resistance ' S one end and MOS pipe ' S D utmost point are connected, load resistance ' S the other end is connected with bridge rectifier circuit ' S negative pole, divider resistance ' S the other end respectively with charging resistance ' S one end and MOS pipe ' S G utmost point are connected, charging resistance ' S the other end with charging capacitor ' S anodal is connected, and charging capacitor ' S negative pole and MOS pipe ' S S utmost point all are connected with bridge rectifier circuit ' S negative pole, discharging resistance parallelly connected in charging capacitor ' S both ends.
2. The overvoltage protection device for a tweeter of claim 1 wherein a current input of said charging resistor is provided with an anti-reverse diode.
3. The overvoltage protection device for a tweeter of claim 1 wherein a zener diode is disposed between the G and S poles of said MOS transistor.
4. The overvoltage protection device for a tweeter of claim 1 wherein the MOS transistor is an NMOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010832285.0A CN111864713A (en) | 2020-08-18 | 2020-08-18 | Overvoltage protection device for high pitch loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010832285.0A CN111864713A (en) | 2020-08-18 | 2020-08-18 | Overvoltage protection device for high pitch loudspeaker |
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| Publication Number | Publication Date |
|---|---|
| CN111864713A true CN111864713A (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010832285.0A Pending CN111864713A (en) | 2020-08-18 | 2020-08-18 | Overvoltage protection device for high pitch loudspeaker |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112684238A (en) * | 2021-01-08 | 2021-04-20 | 四川湖山电器股份有限公司 | Switching power tube load current real-time monitoring circuit and monitoring system |
-
2020
- 2020-08-18 CN CN202010832285.0A patent/CN111864713A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112684238A (en) * | 2021-01-08 | 2021-04-20 | 四川湖山电器股份有限公司 | Switching power tube load current real-time monitoring circuit and monitoring system |
| CN112684238B (en) * | 2021-01-08 | 2024-05-24 | 四川湖山电器股份有限公司 | Switch power tube load current real-time monitoring circuit and monitoring system |
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