CN210579191U - BTL power amplifier circuit with eliminate loudspeaker snake sound circuit - Google Patents
BTL power amplifier circuit with eliminate loudspeaker snake sound circuit Download PDFInfo
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- CN210579191U CN210579191U CN201921843175.3U CN201921843175U CN210579191U CN 210579191 U CN210579191 U CN 210579191U CN 201921843175 U CN201921843175 U CN 201921843175U CN 210579191 U CN210579191 U CN 210579191U
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Abstract
The utility model relates to a BTL power amplifier circuit with eliminate loudspeaker clack sound circuit. The BTL power amplifier circuit comprises a chip, wherein the model of the chip is IRS 2092; a PIN PIN5 of the chip is connected with a signal receiving end through a resistor R35 and a resistor R106 which are connected in series in sequence, the resistor R106 is connected with a diode D2, the diode D2 is connected with a switching tube and grounded through the switching tube, the control end of the switching tube is connected with a detection circuit, when the power supply voltage is normal, the detection circuit outputs a low level to the control end of the switching tube, and the switching tube is cut off; when the power supply voltage is lower or the power is off, the detection circuit outputs high level to the control end of the switch tube, the switch tube is conducted, the level of the PIN PIN5 is pulled low, and the chip stops PWM output. The utility model discloses a detection circuitry detects mains voltage, changes the signal end electric potential of chip according to mains voltage, and control chip exports audio signal to prevent sending of the sound of clacking.
Description
Technical Field
The utility model relates to a stereo set technical field especially relates to a BTL power amplifier circuit with eliminate loudspeaker clatter circuit.
Background
With the improvement of living standard of people, people have more and more outdoor activities; when people do outdoor activities, people often carry a power amplifier to play sound, such as square dance and the like; when the power amplifier is powered off, a large surge is generated due to the difference of the power off time sequences, so that the power amplifier outputs a large clicking sound, and the user experience is greatly reduced.
At present, the power amplifier circuit generally adopts an IRS2092 as a driving chip to design a power amplifier circuit, and the IRS2092 outputs a PWM current signal to a loudspeaker to control the loudspeaker to sound; the PIN PIN5 of the IRS2092S chip is used for controlling an externally output PWM current signal, and if the input voltage of the PIN PIN5 can be controlled before power failure and the PWM output of the ISR2092 is closed, a circuit for eliminating click noise needs to be designed for the chip.
Disclosure of Invention
An object of the utility model is to prior art not enough, provide a BTL power amplifier circuit with eliminate loudspeaker clack sound circuit, canceling circuit ability short-term test external voltage, to BTL power amplifier circuit's chip signals when the outage, BTL power amplifier circuit stops external output PWM current signal.
A BTL power amplifier circuit with a circuit for eliminating horn click sound comprises a chip, wherein the chip is IRS 2092; a PIN PIN5 of the chip is connected with a signal receiving end through a resistor R35 and a resistor R106 which are connected in series in sequence, the output end of the resistor R106 is connected with a diode D2, the negative electrode of the diode D2 is connected with a switching tube and is grounded through the switching tube, the control end of the switching tube is connected with a detection circuit for detecting power supply voltage, when the power supply voltage is normal, the detection circuit outputs low level to the control end of the switching tube, and the switching tube is cut off; when the power supply voltage is low or the power is cut off, the detection circuit outputs high level to the control end of the switch tube, the switch tube is conducted, and the signal receiving end is grounded through the resistor R106, the diode D2 and the switch tube in sequence; the level at PIN5 is pulled low and the chip stops PWM output.
Furthermore, the detection circuit comprises a PNP type triode Q4, a power supply end of the detection circuit is connected with a power supply, the power supply end is grounded through a resistor R5, a diode ZD5, a diode D17 and a resistor R44 which are connected in series in sequence, and a capacitor C127 is connected in parallel with the resistor R44; the output end of the resistor R5 is connected with the base electrode of the triode Q4 through the resistor R43, and the positive electrode of the capacitor C127 is connected with the emitting electrode of the triode Q4; the collector of the transistor Q4 is connected to the control terminal of the switch tube through a resistor R53.
Furthermore, the switching tube is an NPN-type triode Q7, a collector of the triode Q4 is connected with a base of the triode Q7 through a resistor R53, and an emitter of the triode Q3 is grounded; the collector of the transistor Q3 is connected to the cathode of a diode D2 through a resistor R174.
Further, the base of the transistor Q7 is grounded through the parallel capacitor C145 and the resistor R42.
The utility model has the advantages that: the utility model discloses the during operation detects mains voltage through detection circuitry, and when mains voltage reduced, detection circuitry changed power chip's signal end electric potential for power chip stops external output audio signal, thereby prevents the sending of the sound of clarking.
Drawings
Fig. 1 is a schematic circuit diagram of the present embodiment.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings. As shown in fig. 1.
Example 1: a BTL power amplifier circuit with a circuit for eliminating horn click sound comprises a chip, wherein the chip is IRS 2092; a PIN PIN5 of the chip is connected with a signal receiving end through a resistor R35 and a resistor R106 which are connected in series in sequence, the output end of the resistor R106 is connected with a diode D2, the negative electrode of the diode D2 is connected with a switching tube and is grounded through the switching tube, the control end of the switching tube is connected with a detection circuit for detecting power supply voltage, when the power supply voltage is normal, the detection circuit outputs low level to the control end of the switching tube, and the switching tube is cut off; when the power supply voltage is low or the power is cut off, the detection circuit outputs high level to the control end of the switch tube, the switch tube is conducted, and the signal receiving end is grounded through the resistor R106, the diode D2 and the switch tube in sequence; the level at PIN5 is pulled low and the chip stops PWM output.
According to the technical scheme, the input level of a PIN PIN5 of a driving chip is controlled through the detection of a detection circuit on the power supply voltage, and further a PWM current signal output by the chip to a loudspeaker is controlled; when the external power supply is powered off or the voltage is reduced, the detection circuit controls the switch tube to be conducted, after the switch tube is conducted, an external audio current signal is grounded through the signal receiving end, the diode D2 and the switch tube, so that the level of the PIN PIN5 of the chip is lowered, the driving chip stops outputting the PWM audio signal to the outside, the loudspeaker cannot generate click sound, and the aim of eliminating the click sound is fulfilled.
Furthermore, the detection circuit comprises a PNP type triode Q4, a power supply end of the detection circuit is connected with a power supply, the power supply end is grounded through a resistor R5, a diode ZD5, a diode D17 and a resistor R44 which are connected in series in sequence, and a capacitor C127 is connected in parallel with the resistor R44; the output end of the resistor R5 is connected with the base electrode of the triode Q4 through the resistor R43, and the positive electrode of the capacitor C127 is connected with the emitting electrode of the triode Q4; the collector of the transistor Q4 is connected to the control terminal of the switch tube through a resistor R53.
In the circuit of the sound equipment, because of the existence of electronic elements such as a capacitor, an inductor and the like, the power failure speed of each power supply in the circuit is different, and a power supply end can be connected with the power supply with the highest power failure speed; in the embodiment, the power supply is connected with a 15V power supply, when the power supply works normally, the capacitor C127 is charged, the voltage of the positive electrode of the charged capacitor is about 13.6V, and the potential of the collector of the triode Q4 is 13.6V as same as the voltage of the positive electrode of the capacitor C127; the base electrode potential of the triode Q4 is 15V as same as the power supply voltage, and the collector electrode potential of the triode Q4 is lower than the base electrode potential, so that the triode Q4 is cut off; when the power supply is cut off, the voltage of the power supply is rapidly reduced, when the base voltage of the triode Q4 is lower than about 13V, the triode Q4 is conducted, at the moment, the capacitor C127 serves as the power supply to supply power to the outside, the control end of the switch tube is powered to conduct the switch tube, and at the moment, the signal receiving end is grounded through the diode D2 and the switch tube. The PIN PIN5 of the chip is pulled low, and the chip stops outputting audio signals.
Furthermore, the switching tube is an NPN-type triode Q7, a collector of the triode Q4 is connected with a base of the triode Q7 through a resistor R53, and an emitter of the triode Q3 is grounded; the collector of the transistor Q3 is connected to the cathode of a diode D2 through a resistor R174.
In the technical scheme, the switching tube is set to be an NPN type triode Q7, the potential of a PIN PIN5 of the chip is controlled by controlling the potential of a base electrode of a triode Q7, and the scheme is simple and easy to implement; of course, the switching tube may also be a MOS tube.
Further, the base of the transistor Q7 is grounded through the parallel capacitor C145 and the resistor R42.
The parallel connection of the C145 and the resistor R42 forms an RC filter circuit to eliminate the interference of background current.
The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.
Claims (4)
1. A BTL power amplifier circuit with a circuit for eliminating horn click sound comprises a chip, wherein the chip is IRS 2092; pin PIN5 of chip loops through resistance R35, resistance R106 and is connected with the signal receiving terminal that establish ties, its characterized in that: the output end of the resistor R106 is connected with a diode D2, the negative electrode of the diode D2 is connected with a switching tube and is grounded through the switching tube, the control end of the switching tube is connected with a detection circuit for detecting power supply voltage, when the power supply voltage is normal, the detection circuit outputs low level to the control end of the switching tube, and the switching tube is cut off; when the power supply voltage is low or the power is cut off, the detection circuit outputs high level to the control end of the switch tube, the switch tube is conducted, and the signal receiving end is grounded through the resistor R106, the diode D2 and the switch tube in sequence; the level at PIN5 is pulled low and the chip stops PWM output.
2. The BTL power amplifier circuit with the circuit for eliminating the horn rattle of claim 1, wherein: the detection circuit comprises a PNP type triode Q4, a power supply end of the detection circuit is connected with a power supply, the power supply end is grounded through a resistor R5, a diode ZD5, a diode D17 and a resistor R44 which are connected in series in sequence, and a capacitor C127 is connected in parallel with the resistor R44; the output end of the resistor R5 is connected with the base electrode of the triode Q4 through the resistor R43, and the positive electrode of the capacitor C127 is connected with the emitting electrode of the triode Q4; the collector of the transistor Q4 is connected to the control terminal of the switch tube through a resistor R53.
3. The BTL power amplifier circuit with the circuit for eliminating the horn rattle of claim 2, wherein: the switching tube is an NPN type triode Q7, the collector of the triode Q4 is connected with the base of the triode Q7 through a resistor R53, and the emitter of the triode Q3 is grounded; the collector of the transistor Q3 is connected to the cathode of a diode D2 through a resistor R174.
4. The BTL power amplifier circuit with the circuit for eliminating the horn rattle of claim 3, wherein: the base of transistor Q7 is connected to ground through a capacitor C145 and a resistor R42 in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921843175.3U CN210579191U (en) | 2019-10-30 | 2019-10-30 | BTL power amplifier circuit with eliminate loudspeaker snake sound circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921843175.3U CN210579191U (en) | 2019-10-30 | 2019-10-30 | BTL power amplifier circuit with eliminate loudspeaker snake sound circuit |
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| Publication Number | Publication Date |
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| CN210579191U true CN210579191U (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921843175.3U Active CN210579191U (en) | 2019-10-30 | 2019-10-30 | BTL power amplifier circuit with eliminate loudspeaker snake sound circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112638001A (en) * | 2020-12-25 | 2021-04-09 | 深圳市裕富照明有限公司 | Intelligent lamp power supply control circuit and intelligent lamp |
-
2019
- 2019-10-30 CN CN201921843175.3U patent/CN210579191U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112638001A (en) * | 2020-12-25 | 2021-04-09 | 深圳市裕富照明有限公司 | Intelligent lamp power supply control circuit and intelligent lamp |
| CN112638001B (en) * | 2020-12-25 | 2022-07-29 | 深圳市裕富照明有限公司 | Intelligent lamp power supply control circuit and intelligent lamp |
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