CN210053558U - Stereo set power amplifier switching circuit and stereo set - Google Patents
Stereo set power amplifier switching circuit and stereo set Download PDFInfo
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- CN210053558U CN210053558U CN201921096265.0U CN201921096265U CN210053558U CN 210053558 U CN210053558 U CN 210053558U CN 201921096265 U CN201921096265 U CN 201921096265U CN 210053558 U CN210053558 U CN 210053558U
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Abstract
The utility model provides a sound equipment power amplifier switching circuit and a sound equipment, wherein a power module of the sound equipment power amplifier switching circuit is connected with a control module; the input of first relay and second relay is connected with power module's positive pole, the output is connected with the collecting electrode of first transistor, the projecting pole ground connection of first transistor, the base is connected with power module's positive pole through first resistance, the input of first speaker respectively with the normally closed contact of first relay, the movable contact of second relay is connected, the output of external power amplifier is connected with the movable contact of first relay, the output of first power amplifier is connected with the normally open contact of second relay, when control module circular telegram or outage, through the second relay, first speaker and first power amplifier are controlled respectively to first relay, external power amplifier is connected. The utility model discloses can be according to the purpose of user's needs fast switch over power amplifier, save change time and replacement cost, improve user's experience, guarantee the effective use of stereo set.
Description
Technical Field
The utility model relates to a stereo set technical field especially relates to a stereo set power amplifier switching circuit and stereo set.
Background
The power amplifier is called power amplifier for short, and is one of the most basic devices in sound system, commonly called loudspeaker, and its task is to amplify weak electric signal from signal source to drive loudspeaker to make sound. As a necessary device in the sound equipment, the power amplifier can work only by being driven by high voltage and high current, so that faults such as over-temperature, over-current, instantaneous protection, component damage and the like are easily generated when the power amplifier works, and the power amplifier is a weak link of a sound system.
However, for the convenient use of stereo set among the prior art, generally with the power amplifier setting in the audio amplifier of stereo set, and pass through wire or circuit board with power amplifier and speaker and be connected, break down at the power amplifier or when trading other power amplifiers in order to strengthen the audio, the user often can not be as required with built-in power amplifier separately with the speaker fast, thereby can't trade other power amplifiers fast, both reduced user's use and experienced, increased change time again, the replacement cost, perhaps cause the abandonment of stereo set and audio amplifier even, the waste cost.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of prior art, the utility model provides a stereo set power amplifier switching circuit and stereo set can switch over the power amplifier according to user's needs fast, has saved change time and replacement cost, has improved user's experience, has guaranteed the effective use of stereo set.
In order to solve the above problem, the utility model discloses a technical scheme do: a sound power amplifier switching circuit comprises a power module, a control module, a built-in power amplifier, an external power amplifier and a loudspeaker, wherein the built-in power amplifier comprises a first power amplifier, the loudspeaker comprises a first loudspeaker, the power module is connected with the control module, and power is supplied to the control module through the power module; the control module comprises a first resistor, a first transistor, a first relay and a second relay, the input ends of the first relay and the second relay are connected with the anode of the power supply module, the output ends of the first relay and the second relay are connected with the collector of the first transistor, the emitter of the first transistor is grounded, the base of the first transistor is connected with the anode of the power supply module through the first resistor, the input end of the first loudspeaker is respectively connected with the normally closed contact of the first relay and the movable contact of the second relay, the output end of the external power amplifier is connected with the movable contact of the first relay, the output end of the first power amplifier is connected with the normally open contact of the second relay, when the control module is powered on or powered off, the first loudspeaker is respectively controlled by the second relay and the first relay to be connected with the first power amplifier and the external power amplifier.
Furthermore, the loudspeaker also comprises a second loudspeaker, the built-in power amplifier comprises a second power amplifier, and the second loudspeaker and the second power amplifier are respectively connected with the movable contact and the normally open contact of the first relay.
Furthermore, the control module further comprises a second transistor, an emitter of the second transistor is grounded, and a base and a collector of the second transistor are respectively connected with a base and a collector of the first transistor.
Furthermore, the control module further comprises a second resistor and a third resistor, the second resistor is connected with the third resistor in series, and the input end of the second resistor and the output end of the third resistor are respectively connected with the anode and the cathode of the power module.
Furthermore, the control module further includes a third transistor, a base of the third transistor is connected to the output terminal of the second resistor, and a collector and an emitter of the third transistor are respectively connected to the output terminal of the first resistor and the base of the first transistor.
Furthermore, the control module further comprises a first capacitor, and two ends of the first capacitor are respectively connected with the negative electrode of the power module and the output end of the second resistor.
Furthermore, the control module further comprises a first diode and a second diode, the first diode is connected with the second diode in series, the anode of the first diode is connected with the anode of the power module, and the cathode of the second diode is connected with the input end of the second resistor.
Furthermore, the control module further comprises a third diode and a fourth diode, wherein the anode and the cathode of the third diode are respectively connected with the output end and the input end of the first relay, and the anode and the cathode of the fourth diode are respectively connected with the output end and the input end of the second relay.
Further, the negative electrode of the power supply module is grounded, and the voltage output by the power supply module is 15V
Based on the same design, the utility model also provides a stereo set, the stereo set includes as above stereo set power amplifier switching circuit.
Compared with the prior art, the beneficial effects of the utility model reside in that: with first speaker respectively with the normally closed contact of first relay, the movable contact of second relay is connected, and will external power amplifier, the first power amplifier of built-in power amplifier respectively with the movable contact of first relay, the normally open contact of second relay is connected, can be through first relay, the first speaker of break-make electric control of second relay respectively with first power amplifier, external power amplifier is connected, thereby realize the purpose of fast switch over power amplifier according to user's needs, change time and replacement cost have been saved, user's experience has been improved, the effective use of stereo set has been guaranteed.
Drawings
Fig. 1 is a circuit diagram of an embodiment of the switching circuit for the audio power amplifier of the present invention;
fig. 2 is a circuit diagram of the acoustic power amplifier switching circuit according to an embodiment of the present invention when the built-in power amplifier is normal;
fig. 3 is a circuit diagram of the switching circuit of the sound box power amplifier according to the present invention when the power amplifier fails;
fig. 4 is a structural diagram of an embodiment of the sound box of the present invention.
In the figure: CN, straight inserting needle seat; c1, a first capacitance; d1, a first diode; d2, a second diode; r2, a second resistor; r3, third resistor; r1, a first resistor; q3, a third transistor; q2, a second transistor; q1, a first transistor; d4, a fourth diode; d3, a third diode; JR1, first relay; JR2, second relay; BY2, a second speaker; BY1, a first speaker.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.
Please refer to fig. 1, 2, and 3, wherein fig. 1 is a top view of an embodiment of the switching circuit for a sound box power amplifier of the present invention; fig. 2 is a side view of an embodiment of the switching circuit of the sound box power amplifier of the present invention; fig. 3 is an exploded view of an embodiment of the audio power amplifier switching circuit of fig. 2. The sound power amplifier switching circuit of the present invention will be described in detail with reference to fig. 1, 2, and 3.
The sound power amplifier switching circuit in this embodiment includes power module, control module, built-in power amplifier, external power amplifier and speaker, and wherein, built-in power amplifier includes first power amplifier, second power amplifier, and the speaker includes first speaker BY1, second speaker BY2, and power module is connected with control module, supplies power to control module through power module, and then switches the power amplifier that the speaker is connected through control module.
In the present embodiment, the built-in power amplifier is provided in the same speaker box as the first speaker BY 1. When the built-in power amplifier fails, the built-in power amplifier is used as an active power amplifier of a sound box and drives the first loudspeaker BY1 and the second loudspeaker BY2 to work.
In this embodiment, the type of the sound box accommodating the built-in power amplifier and the first speaker BY1 is LA110P sound box, and in other embodiments, the sound box accommodating the built-in power amplifier and the first speaker BY1 may also be other active sound boxes, which is not limited herein.
In this embodiment, the first power amplifier and the second power amplifier are two audio output ports of a built-in power amplifier, and in other embodiments, the first power amplifier and the second power amplifier may also be two different power amplifiers, which is not limited herein.
In this embodiment, the control module includes a first resistor R1, a first transistor Q1, a first relay JR1, and a second relay JR2, input ends of the first relay JR1 and the second relay JR2 are connected to an anode of the power module, output ends are connected to collectors of the transistors, an emitter of the first transistor Q1 is grounded, a base is connected to the anode of the power module through the first resistor R1, an input end of the first speaker BY1 is connected to a normally closed contact of the first relay JR1 and a movable contact of the second relay JR2, an output end of an external power amplifier is connected to a movable contact of the first relay JR1, an output end of the first power amplifier is connected to a normally open contact of the second relay JR2, and when the control module is powered on or powered off, the first speaker BY1 is controlled to be connected to the first power amplifier and the external power amplifier BY the second relay JR2 and the first relay JR 1.
In this embodiment, the number of the movable contacts, the normally open contacts and the normally closed contacts of the first relay JR1 and the second relay JR2 is two, and when the second relay JR2 works, the second relay JR2 controls the movable contacts and the normally open contacts to be connected correspondingly, so as to control the positive electrode and the negative electrode of the first speaker BY1 to be connected correspondingly with the positive electrode and the negative electrode of the first power amplifier connected with the normally open contacts, and thus the first speaker BY1 is driven to work through the first power amplifier. When the first power amplifier fails, the first relay JR1 and the second relay JR2 are not electrified to work, the movable contact of the first relay JR1 is connected with the normally closed contact, and therefore the external power amplifier is connected with the first power amplifier, and the first power amplifier is driven to work through the external power amplifier.
In a preferred embodiment, the positive pole and the negative pole of the second loudspeaker BY2 are connected with two movable contacts of the first relay JR1, and the second power amplifier is connected with a normally open contact of the first relay JR 1. When the first relay JR1 is electrified to work, the movable contact of the first relay JR1 is connected with the normally open contact, the second power amplifier is connected with the second loudspeaker BY2, and the second loudspeaker BY2 is driven to work through the second power amplifier.
In this embodiment, the first speaker BY1 is a subwoofer, the second speaker BY2 is a linear array speaker, and the power amplifier connected between the first speaker BY1 and the second speaker BY2 outputs an audio signal with a corresponding frequency to enable the audio signal to work normally.
In other embodiments, the first speaker BY1 and the second speaker BY2 may also be speakers of a full-band speaker and a bass speaker, and only the power amplifier connected to the first speaker BY1 and the second speaker BY2 needs to be able to output the required audio signal, which is not limited herein.
In the present embodiment, the first relay JR1 and the second relay JR2 are thermal relays, and have a rated current of 20A. In other embodiments, the first relay JR1 and the second relay JR2 may also be an optical relay, an acoustic relay, an electromagnetic relay, or other types of relays, and the rated current thereof may also be set according to the user's needs, which is not described herein.
In this embodiment, the model of the first transistor Q1 is C9014, the resistance value of the first resistor R1 is 47K Ω, in other embodiments, the model of the first transistor Q1 may also be S9014, C9012, or another model, and the resistance value of the first resistor R1 may also be another value, it is only necessary to control the power on and off of the first relay JR1 and the second relay JR2 through the first transistor Q1, and adjust the voltage input to the base of the first transistor Q1 by using the first resistor R1 to turn on the collector and the emitter of the first transistor Q1, and avoid overvoltage damage to the first transistor Q1, which is not limited herein.
In a preferred embodiment, the control module further comprises a second transistor Q2, wherein the emitter of the second transistor Q2 is grounded, the base and the collector are respectively connected with the base and the collector of the first transistor Q1, and the first transistor Q1 is shunted through the second transistor Q2 to avoid the first transistor Q1 from being damaged.
In this embodiment, the type of the second transistor Q2 is the same as that of the first transistor Q1, but in other embodiments, the types of the second transistor Q2 and the first transistor Q1 may be different, and only the two transistors can be turned on and off at the same voltage to divide the voltage through the second transistor Q2, which is not limited herein.
In a preferred embodiment, the control module further includes a second resistor R2, a third resistor R3, a third transistor Q3, and a first capacitor C1, wherein the second resistor R2 is connected in series with the third resistor R3, an input terminal of the second resistor R2 and an output terminal of the third resistor R3 are respectively connected to a positive pole and a negative pole of the power module, a base of the third transistor Q3 is connected to an output terminal of the second resistor R2, and a collector and an emitter are respectively connected to an output terminal of the first resistor R1 and a base of the first transistor Q1. Two ends of the first capacitor C1 are respectively connected with the negative electrode of the power module and the output end of the second resistor R2. The second resistor R2, the third resistor R3, the third transistor Q3 and the first capacitor C1 are used for preventing the first transistor Q1 and the second transistor Q2 from being damaged by voltage current impact generated by on-off current.
In this embodiment, the type of the third transistor Q3 is the same as that of the first transistor Q1, the resistances of the second resistor R2 and the third resistor R3 are 100K Ω and 47K Ω, respectively, the capacitance of the first capacitor C1 is 100 μ F, and the rated voltage is 25V.
In this embodiment, the control module further includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, wherein the first diode D1 is connected in series with the second diode D2, an anode of the first diode D1 is connected to an anode of the power module, and a cathode of the second diode D2 is connected to an input terminal of the second resistor R2. Through the action of the first diode D1 and the second diode D2, the current input by the power supply module enters the sound power amplifier switching circuit through one direction, and the normal work of the circuit is ensured.
In the present embodiment, the types of the first diode D1 and the second diode D2 are 1N4007, and in other embodiments, the types of the first diode D1 and the second diode D2 may also be 1N4001, 1N4006, and other types of rectifier diodes, which are not limited herein.
The anode and cathode of the third diode D3 are connected to the output and input of the first relay JR1, respectively, and the anode and cathode of the fourth diode D4 are connected to the output and input of the second relay JR2, respectively. The third diode D3 and the fourth diode D4 prevent the reverse potential generated when the first relay JR1 and the second relay JR2 are disconnected from influencing the circuit or damaging the components.
In this embodiment, the types of the third diode D3 and the fourth diode D4 are 1N4148, and in other embodiments, the types of the third diode D3 and the fourth diode D4 may also be 1N4573, 1N4574, 1S324, 1S325, and other types of high-speed switching diodes, which is not limited herein.
In this embodiment, the power module includes a pin header CN connected to a switching power supply, and the switching power supply is used to obtain an input voltage of 15, wherein a negative electrode of the pin header CN is connected to a positive electrode of the first diode D1.
In this embodiment, the type of the straight pin holder CN is XH-2P, in other embodiments, the straight pin holder CN may be of another type, and the straight pin holder CN may or may not be connected to the switching power supply, and only needs to transmit the current transmitted by the switching power supply to the control module, which is not limited herein.
The sound power amplifier switching circuit is further explained by the working process of the circuit when the built-in power amplifier is normal or in failure.
When the built-in power amplifier normally works, a switching power supply connected with the power supply module starts to work to output +15V voltage, when a straight-inserting needle seat CN obtains the +15V voltage, the end voltage of a first capacitor C1 is zero, when the first capacitor C1 is fully charged, a third transistor Q3 is conducted, after the first transistor is conducted, the first transistor Q1 and the second transistor Q2 are conducted in a saturated mode, a first relay JR1 and a second relay JR2 are electrified, and a movable contact point on the first relay JR1 and a movable contact point on the second relay JR2 are in contact attraction with a normally-open contact point. The first power amplifier is connected with the first loudspeaker BY1 to drive the first loudspeaker BY1 to make sound, and the second power amplifier output drives the second loudspeaker BY2 to make sound.
When the built-in power amplifier fails, the switching power supply is disconnected, the switching power supply stops working, the voltage output by the straight pin base CN is changed to be 0V, the first transistor Q1, the second transistor Q2 and the third transistor Q3 are cut off, the first relay JR1 and the second relay JR2 are both powered off, and the movable contacts on the first relay JR1 and the second relay JR2 are in contact with the normally closed contacts. The external power amplifier is connected with the first loudspeaker BY1 and drives the first loudspeaker BY1 to make sound.
Compared with the prior art, the beneficial effects of the utility model reside in that: with first speaker respectively with the normally closed contact of first relay, the movable contact of second relay is connected, and will external power amplifier, the first power amplifier of built-in power amplifier respectively with the movable contact of first relay, the normally open contact of second relay is connected, can be through first relay, the first speaker of break-make electric control of second relay respectively with first power amplifier, external power amplifier is connected, thereby realize the purpose of fast switch over power amplifier according to user's needs, change time and replacement cost have been saved, user's experience has been improved, the effective use of stereo set has been guaranteed.
Based on the same conception, the utility model discloses still provide a stereo set, please refer to fig. 4, fig. 4 is the utility model discloses a structural schematic of stereo set embodiment, the utility model discloses a stereo set includes the switching circuit of stereo set power amplifier as above-mentioned embodiment, does not do detailed description here.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.
Claims (10)
1. A switching circuit of a sound equipment power amplifier is characterized by comprising a power supply module, a control module, a built-in power amplifier, an external power amplifier and a loudspeaker, wherein the built-in power amplifier comprises a first power amplifier, the loudspeaker comprises a first loudspeaker,
the power supply module is connected with the control module and supplies power to the control module through the power supply module;
the control module comprises a first resistor, a first transistor, a first relay and a second relay, the input ends of the first relay and the second relay are connected with the anode of the power supply module, the output ends of the first relay and the second relay are connected with the collector of the first transistor, the emitter of the first transistor is grounded, the base of the first transistor is connected with the anode of the power supply module through the first resistor, the input end of the first loudspeaker is respectively connected with the normally closed contact of the first relay and the movable contact of the second relay, the output end of the external power amplifier is connected with the movable contact of the first relay, the output end of the first power amplifier is connected with the normally open contact of the second relay, when the control module is powered on or powered off, the first loudspeaker is respectively controlled by the second relay and the first relay to be connected with the first power amplifier and the external power amplifier.
2. The audio power amplifier switching circuit of claim 1, wherein the speaker further comprises a second speaker, the built-in power amplifier comprises a second power amplifier, and the second speaker and the second power amplifier are respectively connected with the movable contact and the normally open contact of the first relay.
3. The audio power amplifier switching circuit of claim 1, wherein said control module further comprises a second transistor, an emitter of said second transistor is grounded, and a base and a collector of said second transistor are connected to a base and a collector of said first transistor, respectively.
4. The switching circuit of sound power amplifier according to claim 1, wherein the control module further comprises a second resistor and a third resistor, the second resistor is connected in series with the third resistor, and an input terminal of the second resistor and an output terminal of the third resistor are respectively connected with the positive pole and the negative pole of the power module.
5. The switching circuit of sound power amplifier as claimed in claim 4, wherein the control module further comprises a third transistor, wherein the base of the third transistor is connected to the output terminal of the second resistor, and the collector and the emitter are respectively connected to the output terminal of the first resistor and the base of the first transistor.
6. The switching circuit of an audio power amplifier according to claim 4, wherein the control module further comprises a first capacitor, and two ends of the first capacitor are respectively connected to the negative electrode of the power module and the output end of the second resistor.
7. The audio power amplifier switching circuit of claim 4, wherein the control module further comprises a first diode and a second diode, the first diode is connected in series with the second diode, an anode of the first diode is connected with an anode of the power module, and a cathode of the second diode is connected with an input terminal of the second resistor.
8. The switching circuit of sound power amplifier according to claim 1, wherein the control module further comprises a third diode and a fourth diode, wherein the anode and cathode of the third diode are respectively connected to the output terminal and the input terminal of the first relay, and the anode and cathode of the fourth diode are respectively connected to the output terminal and the input terminal of the second relay.
9. The switching circuit for audio power amplifier according to claim 1, wherein the negative electrode of said power module is grounded, and the voltage outputted from said power module is 15V.
10. A sound device, characterized in that the sound device comprises a sound power amplifier switching circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921096265.0U CN210053558U (en) | 2019-07-12 | 2019-07-12 | Stereo set power amplifier switching circuit and stereo set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921096265.0U CN210053558U (en) | 2019-07-12 | 2019-07-12 | Stereo set power amplifier switching circuit and stereo set |
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| Publication Number | Publication Date |
|---|---|
| CN210053558U true CN210053558U (en) | 2020-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921096265.0U Active CN210053558U (en) | 2019-07-12 | 2019-07-12 | Stereo set power amplifier switching circuit and stereo set |
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| Country | Link |
|---|---|
| CN (1) | CN210053558U (en) |
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2019
- 2019-07-12 CN CN201921096265.0U patent/CN210053558U/en active Active
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Effective date of registration: 20221116 Address after: 511400 Room 101, building 2, No. 33, Jiaoxin Road, Lanhe Town, Nansha District, Guangzhou City, Guangdong Province Patentee after: Guangdong Shengyang audio equipment Co.,Ltd. Address before: 511400 A101, No. 33, Jiaoxin Road, Lanhe Town, Nansha District, Guangzhou, Guangdong Patentee before: GUANGZHOU ZSOUND PRO-AUDIO CO. |