CN219164633U - Low-cost startup and shutdown anti-plosive circuit - Google Patents
Low-cost startup and shutdown anti-plosive circuit Download PDFInfo
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- CN219164633U CN219164633U CN202223524350.7U CN202223524350U CN219164633U CN 219164633 U CN219164633 U CN 219164633U CN 202223524350 U CN202223524350 U CN 202223524350U CN 219164633 U CN219164633 U CN 219164633U
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Abstract
The utility model relates to the technical field of set top boxes, and provides a low-cost startup and shutdown anti-plosive circuit, which is provided with a startup anti-plosive module, wherein a first control end is connected with a first power supply, a second control end is connected with a second power supply, an output end is connected with a mute control pin, a power supply end is connected with the second power supply, and the output end is connected with the mute control pin.
Description
Technical Field
The utility model relates to the technical field of set top boxes, in particular to a low-cost on-off anti-plosive circuit.
Background
With the development of scientific technology and the improvement of the living standard of people, a television and a matched network box become necessary articles in the life of people. However, when the network box is turned on and off, we can always hear the pop sound coming out of the television, which also affects our user experience.
At present, aiming at the problem that plosive is generated when the audio equipment is powered on, capacitive filtering is generally adopted, and the plosive eliminating effect is weaker.
Most of network boxes existing in the market at present cannot prevent the occurrence of plosive when the machine is started or shut down, and the explosion-proof sound circuit used by a small part of network boxes only aims at one condition of the machine when the machine is started or shut down, so that the product cost is increased. Therefore, it is desirable to design a low cost burst noise circuit to avoid burst noise generated when the machine is turned on and off.
Disclosure of Invention
The utility model provides a low-cost on-off anti-plosive circuit, which solves the technical problems that the existing anti-plosive scheme cannot be compatible with plosive of equipment on-off and has higher cost.
In order to solve the technical problems, the utility model provides a low-cost startup and shutdown anti-plosive circuit, which comprises a startup anti-plosive module, a shutdown anti-plosive module, a first power supply and a second power supply, wherein the first power supply and the second power supply are connected with the startup anti-plosive module; the power end of the shutdown anti-plosive module is connected with the second power supply, and the output end of the shutdown anti-plosive module is connected with a mute control pin; the first control end of the startup anti-plosive module is connected with the first power supply, the second control end of the startup anti-plosive module is connected with the second power supply, and the output end of the startup anti-plosive module is connected with the mute control pin.
This basic scheme sets up first control end and first power supply to be connected, second control end and second power supply to be connected, the output is with the start anti-pop sound module that silence control pin is connected, set up the power end with second power supply is connected, the output is with the shut down anti-pop sound module that silence control pin is connected, when start-up pop sound and shut down pop sound produce, drive start-up anti-pop sound module, shut down anti-pop sound module respectively through power supply's change, with the audio output short to ground, thereby avoid the production of pop sound, and be suitable for in all devices that possess audio interface, prevent the pop sound that produces when start-up and shut down effectively.
In a further embodiment, the startup anti-plosive module comprises a closing module and a starting module which are electrically connected, wherein a power end of the closing module is connected with the first power supply, and an output end of the closing module is connected with the starting module; the power end of the starting module is connected with the second power supply, and the output end of the starting module is connected with the mute control pin;
the starting module comprises a first switch tube and a first resistor; when the first switching tube is an NPN triode, the base electrode of the first switching tube is connected with the second power supply through a first resistor, the collector electrode of the first switching tube is connected with the mute control pin, and the emitter electrode of the first switching tube is grounded.
This scheme sets up simple triode switch circuit, through directly being connected with the second power supply, when the device start-up is electrified, directly switches on silence control pin ground, can accurately realize the switch and prevent the plosive through the start silence.
In a further embodiment, the shutdown module includes a second switching tube, a second resistor, a third resistor, and a first capacitor; when the second switching tube is an NPN triode, the collector electrode of the second switching tube is connected with the base electrode of the first switching tube, the emitter electrode of the second switching tube is grounded, and the base electrode of the second switching tube is connected with the first power supply through the second resistor; one end of the third resistor is connected with the base electrode of the second switching tube, and the other end of the third resistor is grounded; the first capacitor is connected in parallel with the third resistor.
The scheme sets up the closing module of being connected with first power supply, after the device is electrified, because RC delay circuit that third resistance and first electric capacity are constituteed, the third switching tube just switches on after the start plosive finishes, and then pulls down the base voltage of first switching tube after normal power supply a period for silence control pin resumes normally, guarantees the normal output of equipment audio frequency.
In a further embodiment, the shutdown anti-plosive module comprises a switch module and a delay module which are electrically connected; the switch module comprises a third switch tube, a fourth resistor, a fifth resistor, a sixth resistor and a diode, and when the third switch tube is a PNP type tertiary tube and the fourth switch tube is an NPN type tertiary tube:
the base electrode of the third switching tube is connected with the second power supply through a fourth resistor, the collector electrode of the third switching tube is connected with the base electrode of the fourth switching tube through a fifth resistor, and the emitter electrode of the third switching tube is connected with one end of the sixth resistor; the anode of the diode is connected with the second power supply, and the cathode of the diode is connected with the other end of the sixth resistor; and the base electrode of the fourth switch is connected with the mute control pin, and the emitter electrode is grounded.
In a further embodiment, the delay module comprises a second capacitor and a seventh resistor, wherein the positive electrode of the second capacitor is connected with the emitter electrode of the third switch tube, the negative electrode of the second capacitor is grounded, and the second capacitor is connected with the seventh capacitor in parallel.
According to the scheme, a PNP type tertiary tube and an NPN type tertiary tube are combined into a two-stage switching circuit, when the device works normally, the circuit is in a cut-off state, when the device starts to power down, the power down speed of an emitter of a third switching tube is lower than that of a collector due to delayed discharge of a second capacitor, and then when the voltage of the emitter is about 0.7V higher than that of the collector, the third switching tube is conducted, at the moment, a fourth switching tube is conducted, a mute output pin is connected to the ground, and audio silence is achieved; the circuit is connected with the diode in series, so that the voltage of the emitter of the third switching tube can be prevented from being reversely poured onto the second power supply when the equipment is powered down.
In a further embodiment, the first power supply supplies a power voltage to an adapter of the device.
In a further embodiment, the second power supply is a power supply voltage of the device.
The utility model only needs to be built by using a resistor, a capacitor, a transistor and a diode, does not need to be built by using an IC, and has simple circuit and low cost.
Drawings
Fig. 1 is a hardware circuit diagram of a low-cost on-off anti-plosive circuit provided by an embodiment of the utility model;
wherein: the anti-plosive module A is started, the anti-plosive module B is shut down, the first power supply V1 and the second power supply V2 are powered on; the first resistor R1 to the seventh resistor R7, the first switch tube Q1 to the fourth switch tube Q4, the first capacitor C1, the second capacitor C2 and the diode D1; MUTE control pin MUTE.
Detailed Description
The following examples are given for the purpose of illustration only and are not to be construed as limiting the utility model, including the drawings for reference and description only, and are not to be construed as limiting the scope of the utility model as many variations thereof are possible without departing from the spirit and scope of the utility model.
In the embodiment of the utility model, as shown in fig. 1, the low-cost startup and shutdown anti-plosive circuit comprises a startup anti-plosive module A, a shutdown anti-plosive module B, and a first power supply V1 and a second power supply V2 which are connected with the startup anti-plosive module A; the power end of the shutdown anti-explosion sound module B is connected with a second power supply V2, and the output end of the shutdown anti-explosion sound module B is connected with a MUTE control pin MUTE; the first control end of the startup anti-plosive module A is connected with a first power supply V1, the second control end is connected with a second power supply V2, and the output end of the startup anti-plosive module A is connected with a MUTE control pin MUTE.
In this embodiment, the startup anti-plosive module a includes a closing module and a starting module which are electrically connected, a power end of the closing module is connected with the first power supply V1, and an output end of the closing module is connected with the starting module; the power end of the starting module is connected with a second power supply V2, and the output end of the starting module is connected with a MUTE control pin MUTE;
the starting module comprises a first switching tube Q1 and a first resistor R1; when the first switching tube Q1 is an NPN-type triode, the base of the first switching tube Q1 is connected to the second power supply V2 through the first resistor R1, the collector is connected to the MUTE control pin MUTE, and the emitter is grounded.
The embodiment is provided with a simple triode switch circuit, and is directly connected with the second power supply V2, so that when the device is started and electrified, the MUTE control pin MUTE is directly conducted to the ground, and the anti-plosive sound of the switch can be accurately realized through starting and muting.
In this embodiment, the closing module includes a second switching tube Q2, a second resistor R2, a third resistor R3, and a first capacitor C1; when the second switching tube Q2 is an NPN triode, the collector of the second switching tube Q2 is connected with the base electrode of the first switching tube Q1, the emitter is grounded, and the base electrode is connected with the first power supply V1 through the second resistor R2; one end of the third resistor R3 is connected with the base electrode of the second switch tube Q2, and the other end of the third resistor R is grounded; the first capacitor C1 is connected in parallel with the third resistor R3.
In this embodiment, a closing module connected to the first power supply V1 is provided, after the device is powered on, because the third resistor R3 and the RC delay circuit formed by the first capacitor C1 are turned on after the start-up plosive is finished, the third switching tube Q3 is turned on, and then the base voltage of the first switching tube Q1 is pulled down after a period of normal power supply, so that the MUTE control pin MUTE is recovered to be normal, and normal output of equipment audio is ensured.
Preferably, in order to ensure delayed conduction of the second switching tube Q2, the second resistor R2 and the third resistor R3 propose selecting kΩ or more, and the first capacitor C1 selects a patch capacitor. The on time of the second switching tube Q2 must be longer than the time of the start-up plosive to ensure that the plosive is effectively divided, and the on time of the second switching tube Q2 can be realized by adjusting the values of the second resistor R2, the third resistor R3 and the first capacitor C1.
In this embodiment, the shutdown anti-plosive module B includes a switch module and a delay module electrically connected; the switch module comprises a third switch tube Q3, a fourth switch tube Q4, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a diode D1, when the third switch tube Q3 is a PNP type tertiary tube and the fourth switch tube Q4 is an NPN type tertiary tube:
the base electrode of the third switching tube Q3 is connected with the second power supply V2 through a fourth resistor R4, the collector electrode is connected with the base electrode of the fourth switching tube Q4 through a fifth resistor R5, and the emitter electrode is connected with one end of a sixth resistor R6; the anode of the diode D1 is connected with the second power supply V2, and the cathode of the diode D is connected with the other end of the sixth resistor R6; the base of the fourth switch is connected with the MUTE control pin MUTE, and the emitter is grounded.
In this embodiment, the delay module includes a second capacitor C2 and a seventh resistor R7, where an anode of the second capacitor C2 is connected to an emitter of the third switching tube Q3, a cathode of the second capacitor C2 is grounded, and the second capacitor C2 is connected to the seventh capacitor in parallel.
Preferably, the second capacitor C2 is an electrolytic capacitor. The on time of the third switching tube Q3 needs to be faster than the occurrence time of the shutdown plosive, and the on time of the third switching tube Q3 is adjusted by adjusting the size of the second capacitor C2.
In the embodiment, a PNP type tertiary tube and an NPN type tertiary tube are combined into a two-stage switching circuit, when the device works normally, the circuit is in a cut-off state, when the device starts to power down, the power down speed of an emitter of the third switching tube Q3 is lower than the power down speed of a collector due to the delayed discharge of the second capacitor C2, and then when the voltage of the emitter is about 0.7V higher than the voltage of the collector, the third switching tube Q3 is conducted, at the moment, the fourth switching tube Q4 is conducted, a mute output pin is connected to the ground, and audio mute is realized; the diode D1 is connected in series on the circuit, so that the voltage of the emitter electrode of the third switching tube Q3 can be prevented from being reversely poured onto the second power supply V2 when the equipment is powered down.
In this embodiment, the first power supply V1 is the adapter supply voltage of the device.
In this embodiment, the second power supply V2 is the power supply voltage of the device.
Preferably, the power-up timing of the first power supply V1 is later than the power-up timing of the second power supply V2.
The utility model only needs to be built by using the resistor, the capacitor, the third transistor and the diode D1, does not need to be built by using an IC, and has simple circuit and low cost.
The working principle of the implementation is as follows:
(1) Startup anti-plosive module A
When the device is just electrified, the first switch tube Q1 is in a conducting state, and the MUTE output pin MUTE is grounded, so that the machine is in a MUTE state when just started. The second switching tube Q2 has a turn-on time later than the first switching tube Q1 due to the presence of the RC delay circuit (first capacitor C1). When the second switching tube Q2 is turned on, the first switching tube Q1 is turned off, and the mute output pin returns to normal.
(2) Shutdown anti-plosive module B
When the device is just electrified, meanwhile, the voltage of the emitter electrode of the third switching tube Q3 is lower than the voltage of the base electrode due to the charging of the second capacitor C2, and the third switching tube Q3 is in an off state; after the second capacitor C2 is charged, the third switching tube Q3 is always turned off due to the voltage division of the sixth resistor R6 and the seventh resistor R7. Further, since transistor Q4 is in the off state, transistor Q3 is also in the off state.
When the machine starts to power down, the power down speed of the emitter of the third switching tube Q3 is lower than that of the collector due to the delayed discharge of the second capacitor C2, and when the voltage of the emitter of the third switching tube Q3 is about 0.7V higher than that of the collector, the third switching tube Q3 is conducted; at this time, the fourth switching tube Q4 is also turned on, and the mute output pin is connected to the ground, so as to realize audio mute.
The embodiment of the utility model is provided with a startup anti-plosive module A, a shutdown anti-plosive module B, a startup anti-plosive module A and a shutdown anti-plosive module B, wherein the first control end is connected with a first power supply V1, the second control end is connected with a second power supply V2, the output end is connected with a MUTE control pin MUTE, the power supply end is connected with the second power supply V2, and the output end is connected with the MUTE control pin MUTE.
The above examples are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present utility model should be made in the equivalent manner, and the embodiments are included in the protection scope of the present utility model.
Claims (7)
1. The utility model provides a low-cost switch machine anti-plosive circuit which characterized in that: the device comprises a startup anti-plosive module, a shutdown anti-plosive module, and a first power supply and a second power supply which are connected with the startup anti-plosive module; the power end of the shutdown anti-plosive module is connected with the second power supply, and the output end of the shutdown anti-plosive module is connected with a mute control pin; the first control end of the startup anti-plosive module is connected with the first power supply, the second control end of the startup anti-plosive module is connected with the second power supply, and the output end of the startup anti-plosive module is connected with the mute control pin.
2. A low cost on-off anti-plosive circuit according to claim 1, wherein: the starting anti-plosive module comprises a closing module and a starting module which are electrically connected, a power end of the closing module is connected with the first power supply, and an output end of the closing module is connected with the starting module; the power end of the starting module is connected with the second power supply, and the output end of the starting module is connected with the mute control pin;
the starting module comprises a first switch tube and a first resistor; when the first switching tube is an NPN triode, the base electrode of the first switching tube is connected with the second power supply through a first resistor, the collector electrode of the first switching tube is connected with the mute control pin, and the emitter electrode of the first switching tube is grounded.
3. A low cost on-off anti-plosive circuit according to claim 2, wherein: the closing module comprises a second switch tube, a second resistor, a third resistor and a first capacitor; when the second switching tube is an NPN triode, the collector electrode of the second switching tube is connected with the base electrode of the first switching tube, the emitter electrode of the second switching tube is grounded, and the base electrode of the second switching tube is connected with the first power supply through the second resistor; one end of the third resistor is connected with the base electrode of the second switching tube, and the other end of the third resistor is grounded; the first capacitor is connected in parallel with the third resistor.
4. A low cost on-off anti-plosive circuit as defined in claim 3, wherein: the shutdown anti-plosive module comprises a switch module and a delay module which are electrically connected; the switch module comprises a third switch tube, a fourth resistor, a fifth resistor, a sixth resistor and a diode, and when the third switch tube is a PNP type tertiary tube and the fourth switch tube is an NPN type tertiary tube:
the base electrode of the third switching tube is connected with the second power supply through a fourth resistor, the collector electrode of the third switching tube is connected with the base electrode of the fourth switching tube through a fifth resistor, and the emitter electrode of the third switching tube is connected with one end of the sixth resistor; the anode of the diode is connected with the second power supply, and the cathode of the diode is connected with the other end of the sixth resistor; and the base electrode of the fourth switch is connected with the mute control pin, and the emitter electrode is grounded.
5. A low cost on-off anti-plosive circuit according to claim 4, wherein: the delay module comprises a second capacitor and a seventh resistor, wherein the positive electrode of the second capacitor is connected with the emitter electrode of the third switching tube, the negative electrode of the second capacitor is grounded, and the second capacitor is connected with the seventh capacitor in parallel.
6. A low cost on-off anti-plosive circuit according to claim 1, wherein: the first power supply supplies a power voltage to an adapter of the device.
7. A low cost on-off anti-plosive circuit according to claim 1, wherein: the second power supply is a power supply voltage of the device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223524350.7U CN219164633U (en) | 2022-12-27 | 2022-12-27 | Low-cost startup and shutdown anti-plosive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223524350.7U CN219164633U (en) | 2022-12-27 | 2022-12-27 | Low-cost startup and shutdown anti-plosive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219164633U true CN219164633U (en) | 2023-06-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223524350.7U Active CN219164633U (en) | 2022-12-27 | 2022-12-27 | Low-cost startup and shutdown anti-plosive circuit |
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| Country | Link |
|---|---|
| CN (1) | CN219164633U (en) |
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- 2022-12-27 CN CN202223524350.7U patent/CN219164633U/en active Active
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