CN114296538A - Electronic equipment power amplifier power supply control circuit and electronic equipment - Google Patents
Electronic equipment power amplifier power supply control circuit and electronic equipment Download PDFInfo
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- CN114296538A CN114296538A CN202111489246.6A CN202111489246A CN114296538A CN 114296538 A CN114296538 A CN 114296538A CN 202111489246 A CN202111489246 A CN 202111489246A CN 114296538 A CN114296538 A CN 114296538A
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- 238000001514 detection method Methods 0.000 claims abstract description 40
- 230000005669 field effect Effects 0.000 claims description 59
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000003068 static effect Effects 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The invention discloses a power amplifier power supply control circuit of electronic equipment and the electronic equipment, wherein the power amplifier power supply control circuit comprises a detection circuit and a switch control circuit; the detection circuit is used for detecting the working state of an external interface on the electronic equipment; the switch control circuit comprises a switch circuit, and a power input end, a power output end and a signal control end which are connected with the switch circuit; the signal control end is electrically connected with the detection circuit, so that the switch circuit controls the on/off of the power supply output end and the power supply input end according to the detection signal of the detection circuit; the power supply input end is electrically connected with a power amplifier power supply of the electronic equipment, and the power supply output end is electrically connected with a power amplifier of the electronic equipment, which is used for driving a loudspeaker; through the power amplifier power supply control circuit of the electronic equipment, when the electronic equipment plays audio and video resources through the external playing equipment, the static power consumption of the power amplifier of the electronic equipment can be eliminated, so that the power consumption of the whole electronic equipment is effectively reduced, and the standby time is prolonged.
Description
Technical Field
The invention relates to the technical field of power amplifier power supply control, in particular to a power amplifier power supply control circuit of electronic equipment and the electronic equipment.
Background
Many electronic devices, such as notebook computers, have power amplifiers, but generally have an external interface (such as an earphone jack), through which audio/video data of the notebook computer can be played through the external device (such as an earphone, a sound box, etc.). In the prior art, when a notebook computer plays a video, a power amplifier can drive a loudspeaker to play, and after an earphone connector is inserted into an earphone jack on the notebook computer, the power amplifier of the notebook computer does not work because the audio is played through a loudspeaker of an earphone at the moment, but the power amplifier is still connected with a power amplifier power supply and is in a static standby state, the power consumption of the power amplifier is not negligible, and especially in the working state of using a battery of the notebook computer, the standby power consumption has more obvious influence on the standby duration of the notebook computer.
Disclosure of Invention
The present invention provides a power amplifier power supply control circuit for an electronic device and an electronic device, which can cut off the power amplifier power supply of the power amplifier when the external device is connected.
In order to achieve the purpose, the invention discloses a power amplifier power supply control circuit of electronic equipment, which comprises a detection circuit and a switch control circuit;
the detection circuit is electrically connected with an external discharge interface of the electronic equipment, which is used for audio and video connection with the external discharge equipment, so as to detect the working state of the external discharge interface;
the switch control circuit comprises a switch circuit, and a power input end, a power output end and a signal control end which are connected with the switch circuit; the signal control end is electrically connected with the detection circuit, so that the switch circuit controls the on/off of the power supply output end and the power supply input end according to a detection signal of the detection circuit; the power input end is electrically connected with a power amplifier power supply of the electronic equipment, and the power output end is electrically connected with a power amplifier of the electronic equipment, which is used for driving a loudspeaker.
Preferably, the detection circuit includes a signal connection line, one end of the signal connection line is electrically connected to the status pin of the external interface, and the other end of the signal connection line is electrically connected to the signal control end of the switch circuit.
Preferably, the detection circuit further includes a current limiting resistor disposed on the signal connection line.
Preferably, the detection circuit further comprises a ground resistor, one end of the ground resistor is connected to the signal connection line, and the other end of the ground resistor is connected to ground.
Preferably, the switching circuit comprises a three-pole switching control tube.
Preferably, the three-pole switch control transistor includes a first field effect transistor and a second field effect transistor electrically connected to each other, two controllable conducting terminals of the first field effect transistor are electrically connected to the power input terminal and the power output terminal, respectively, a control terminal of the first field effect transistor is electrically connected to one of the two controllable conducting terminals of the second field effect transistor, and a control terminal of the second field effect transistor is electrically connected to the detection circuit, so that the second field effect transistor can control on/off of the two controllable conducting terminals of the first field effect transistor through a signal of the detection circuit.
Preferably, the first field effect transistor is a PMOS transistor, the second field effect transistor is an NMOS transistor, a source of the second field effect transistor is grounded, a source of the first field effect transistor is electrically connected to a drain of the second field effect transistor through a first voltage dividing resistor and a second voltage dividing resistor connected in series, and a gate of the first field effect transistor is electrically connected between the first voltage dividing resistor and the second voltage dividing resistor.
Preferably, a buffer circuit is further disposed between the control terminal of the first field effect transistor and the power input terminal, and the buffer circuit is configured to delay the on-time of the first field effect transistor.
Preferably, the buffer circuit includes a buffer capacitor connected between the control terminal of the first field effect transistor and the power supply input terminal.
The invention also discloses electronic equipment which comprises an equipment body, wherein the equipment body is internally provided with a power amplifier used for driving the loudspeaker to work and a power amplifier power supply electrically connected with the power amplifier, the equipment body is also provided with an external amplifier interface used for audio and video connection with external amplifier equipment, and the power amplifier is electrically connected with the power amplifier power supply through the electronic equipment power amplifier power supply control circuit.
Compared with the prior art, the power amplifier power supply control circuit of the electronic equipment comprises a detection circuit and a switch control circuit, wherein the detection circuit detects whether an external playing interface on the electronic equipment is connected with the external playing equipment in real time, when the electronic equipment plays audio and video, if the external playing equipment is not connected, a power supply input end and a power supply output end are switched on through the switch circuit, so that the power amplifier and the power amplifier power supply are electrically connected, and when the external playing interface on the electronic equipment is connected with the external playing equipment, the switch circuit can automatically cut off a power supply path between the power amplifier and the power amplifier power supply, so that the standby power consumption of the power amplifier is reduced to zero; therefore, by the power amplifier power supply control circuit of the electronic equipment, when the electronic equipment plays audio and video resources through the external playing equipment, the static power consumption of the power amplifier of the electronic equipment can be eliminated, so that the power consumption of the whole electronic equipment is effectively reduced, and the standby time is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of a power amplifier power supply control circuit in the embodiment of the invention.
Fig. 2 is a schematic diagram of a peripheral interface circuit on a peripheral device according to an embodiment of the present invention.
Fig. 3 is a flowchart illustrating an operation of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
The embodiment discloses an energy-saving electronic device, and the electronic device in the embodiment takes a notebook computer as an example, but is not limited thereto, and for example, the electronic device may also be a portable electronic device such as a tablet that is sensitive to power consumption. Specifically, as shown in fig. 1, the electronic device includes a device body, a power amplifier used for driving the loudspeaker to work and a power amplifier power supply VSYS electrically connected with the power amplifier are arranged in the device body, an external amplifier interface used for audio/video connection with external amplifier equipment is further arranged on the device body, and the power amplifier is electrically connected with the power amplifier power supply VSYS through a power amplifier power supply control circuit 100.
As shown in fig. 3, when audio and video resources are played through a notebook computer, the power amplifier power supply control circuit 100 may detect a connection state of an external interface on the notebook computer, that is, detect whether an earphone is plugged, and if so, cut off a power path between the power amplifier and the power amplifier power supply VSYS, so that the power amplifier is in a zero power consumption state, thereby reducing static loss of the power amplifier. And when the external playing interface is not inserted into the earphone, the power path between the power amplifier and the power amplifier VSYS is switched on, so that the power amplifier is in a working state, and the loudspeaker of the notebook computer is driven to work.
Referring to fig. 1, the power amplifier power control circuit 100 includes a detection circuit 10 and a switch control circuit 20.
The detection circuit 10 is electrically connected to the external interface of the electronic device to detect the operating state of the external interface.
The switch control circuit 20 includes a switch circuit, and a power input terminal IN, a power output terminal OUT, and a signal control terminal CN connected to the switch circuit.
The signal control terminal CN is electrically connected to the detection circuit 10, so that the switch circuit controls on/off of the power output terminal OUT and the power input terminal IN according to the detection signal of the detection circuit 10. The power input end IN is electrically connected with a power amplifier VSYS of the electronic equipment, and the power output end OUT is electrically connected with a power amplifier of the electronic equipment, wherein the power amplifier is used for driving a loudspeaker.
When the external device is connected to the external interface, the detection circuit 10 feeds back a detection signal to the switching circuit, and the switching circuit disconnects the connection path between the power input terminal IN and the power output terminal OUT according to the detection signal.
Referring to fig. 1 and 2, the detection circuit 10 includes a signal connection line L, one end of the signal connection line L is electrically connected to a status pin (e.g., AUDIO _ HP pin of the earphone interface) of the external interface, and the other end of the signal connection line L is electrically connected to a signal control terminal CN of the switch circuit. Therefore, when the external device is not connected to the external device, the AUDIO _ HP pin is at a high level, the switch circuit switches on the power supply path between the power input terminal IN and the power output terminal OUT according to the signal, and when the external device is connected to the external device, the AUDIO _ HP pin is at a low level, and the switch circuit switches off the power supply path between the power input terminal IN and the power output terminal OUT. Preferably, the detection circuit 10 further includes a current limiting resistor R1 disposed on the signal connection line L. In addition, the detection circuit 10 further includes a ground resistor R2, one end of the ground resistor R2 is connected to the signal connection line L, and the other end of the ground resistor is connected to ground, so that the ground resistor R2 can effectively prevent electrostatic grounding and improve the safety performance of the electronic device.
Further, the switching circuit includes a three-pole switching control tube.
Specifically, the triode switch control transistor includes a first field effect transistor Q1 and a second field effect transistor Q2 electrically connected, two controllable conducting terminals of the first field effect transistor Q1 are electrically connected with the power input terminal IN and the power output terminal OUT, respectively, a control terminal of the first field effect transistor Q1 is electrically connected with one of the two controllable conducting terminals of the second field effect transistor Q2, and a control terminal of the second field effect transistor Q2 is electrically connected with the detection circuit 10, so that the second field effect transistor Q2 can control on/off of the two controllable conducting terminals of the first field effect transistor Q1 through a signal of the detection circuit 10. More specifically, the first field effect transistor Q1 is a PMOS transistor, the second field effect transistor Q2 is an NMOS transistor, the source S of the second field effect transistor Q2 is grounded, the source S of the first field effect transistor Q1 is electrically connected to the drain D of the second field effect transistor Q2 through a first voltage-dividing resistor R3 and a second voltage-dividing resistor R4 which are connected in series, and the gate G of the first field effect transistor Q1 is electrically connected between the first voltage-dividing resistor R3 and the second voltage-dividing resistor R4.
The operating principle of the switching circuit with the structure is as follows: take the power amplifier VSYS voltage Vs as 12V, and the first voltage dividing resistor R3 and the second voltage dividing resistor R4 are both 150 Ω as an example.
When the external amplifier interface is not connected to the external amplifier device, the AUDIO _ HP pin is at a high level, and under the action of the high level, the source S and the drain D of the two controllable conducting ends of the second field effect transistor Q2 are conducted, so that the drain D is pulled down to be IN contact with the ground, and then under the voltage division action of the first voltage division resistor R3 and the second voltage division resistor R4, the voltage Vg of the gate G of the first field effect transistor Q1 is 6V, so that the conducting voltage Vgs of the first field effect transistor Q1 is-6V, so that the source S and the drain D of the first field effect transistor Q1 are conducted, and further the power input end IN and the power output end OUT are connected, thereby opening a power supply path between the power amplifier and the power amplifier power supply VSYS, and enabling the power amplifier to normally operate.
When the external amplifier interface is connected to the external amplifier device, the AUDIO _ HP pin is at a low level, and under the action of the low level, the conduction voltage drop of the second field effect transistor Q2 is zero, so that the second field effect transistor Q2 is turned off, and the drain D of the second field effect transistor Q2 is disconnected from the ground to present a high-resistance state, and therefore, the voltages of the gate G and the source S of the first field effect transistor Q1 are both 12V, then the conduction voltage drop Vgs of the first field effect transistor Q1 is zero, so that the first field effect transistor Q1 is turned off, and further the power input end IN and the power output end OUT are disconnected, and the power path between the power amplifier and the power amplifier power supply VSYS is cut off, so that the power amplifier is completely IN a zero power consumption state.
Referring to fig. 1 again, IN order to effectively prevent the transient current from causing a large impact to the first fet Q1 when the first fet Q1 is turned on, a buffer circuit is further disposed between the control terminal of the first fet Q1 and the power input terminal IN, and the buffer circuit is used to delay the turn-on time of the first fet Q1. Specifically, the buffer circuit includes a buffer capacitor C1 connected between the control terminal of the first field effect transistor Q1 and the power supply input terminal IN. In this embodiment, by setting the buffer capacitor C1, the on-time of the first fet Q1 can be delayed (e.g., by 4ms), so that the on-voltage drop of the first fet Q1 rises to 6V within 4ms, rather than sudden change.
To sum up, with the electronic device with the power amplifier power supply control circuit 100 disclosed in the above embodiment, when the electronic device plays audio and video resources through the external device, the static power consumption of the power amplifier of the electronic device itself can be eliminated, so that the overall power consumption of the electronic device is effectively reduced, and the standby time is prolonged.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (10)
1. A power amplifier power supply control circuit of electronic equipment is characterized by comprising a detection circuit and a switch control circuit;
the detection circuit is electrically connected with an external discharge interface of the electronic equipment, which is used for audio and video connection with the external discharge equipment, so as to detect the working state of the external discharge interface;
the switch control circuit comprises a switch circuit, and a power input end, a power output end and a signal control end which are connected with the switch circuit; the signal control end is electrically connected with the detection circuit, so that the switch circuit controls the on/off of the power supply output end and the power supply input end according to a detection signal of the detection circuit; the power input end is electrically connected with a power amplifier power supply of the electronic equipment, and the power output end is electrically connected with a power amplifier of the electronic equipment, which is used for driving a loudspeaker.
2. The power amplifier power supply control circuit of claim 1, wherein the detection circuit comprises a signal connection line, one end of the signal connection line is electrically connected to the status pin of the external interface, and the other end of the signal connection line is electrically connected to the signal control end of the switch circuit.
3. The power amplifier power supply control circuit of claim 2, wherein the detection circuit further comprises a current limiting resistor disposed on the signal connection line.
4. The power amplifier power supply control circuit of claim 2, wherein the detection circuit further comprises a ground resistor, one end of the ground resistor is connected to the signal connection line, and the other end of the ground resistor is connected to ground.
5. The power amplifier power supply control circuit of claim 1, wherein the switching circuit comprises a triode switch control transistor.
6. The power amplifier control circuit of claim 5, wherein the triode switch control transistor comprises a first field effect transistor and a second field effect transistor electrically connected to each other, two controllable conducting terminals of the first field effect transistor are electrically connected to the power input terminal and the power output terminal respectively, a control terminal of the first field effect transistor is electrically connected to one of the two controllable conducting terminals of the second field effect transistor, and a control terminal of the second field effect transistor is electrically connected to the detection circuit, so that the second field effect transistor can control on/off of the two controllable conducting terminals of the first field effect transistor through a signal of the detection circuit.
7. The power amplifier power supply control circuit of claim 6, wherein the first field effect transistor is a PMOS transistor, the second field effect transistor is an NMOS transistor, a source of the second field effect transistor is grounded, a source of the first field effect transistor is electrically connected to a drain of the second field effect transistor through a first voltage dividing resistor and a second voltage dividing resistor connected in series, and a gate of the first field effect transistor is electrically connected between the first voltage dividing resistor and the second voltage dividing resistor.
8. The power amplifier power supply control circuit of claim 6, wherein a buffer circuit is further disposed between the control terminal of the first field effect transistor and the power input terminal, and the buffer circuit is configured to delay the on-time of the first field effect transistor.
9. The power amplifier power supply control circuit of claim 8, wherein the buffer circuit comprises a buffer capacitor connected between the control terminal of the first field effect transistor and the power supply input terminal.
10. An electronic device, characterized in that, includes the equipment body, this internal power amplifier that is used for driving the speaker work that is provided with of equipment and with power amplifier electric connection's power amplifier power, still be provided with on the equipment body and be used for carrying out the interface that puts outward that audio and video is connected with external equipment, power amplifier through any one of claims 1 to 9 electronic equipment power amplifier power supply control circuit with power amplifier power electric connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111489246.6A CN114296538A (en) | 2021-12-07 | 2021-12-07 | Electronic equipment power amplifier power supply control circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111489246.6A CN114296538A (en) | 2021-12-07 | 2021-12-07 | Electronic equipment power amplifier power supply control circuit and electronic equipment |
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| CN114296538A true CN114296538A (en) | 2022-04-08 |
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| CN202111489246.6A Pending CN114296538A (en) | 2021-12-07 | 2021-12-07 | Electronic equipment power amplifier power supply control circuit and electronic equipment |
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2021
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