Power amplifier switching control circuit, electronic device, and method

Abstract

The present application relates to the technical fields of power amplifier output, and provides a power amplifier switching control circuit, electronic equipment and method, the power amplifier switching control circuit includes load module, control module, switching module, single-channel switch module and double-channel switch module, the control module is connected with the switching module, the switching module is connected with the load module, single-channel switch module and double-channel switch module respectively, single-channel switch module is connected with double-channel switch module, the load module is connected with single-channel switch module and double-channel switch module respectively, single-channel switch module and double-channel switch module are controlled by the control module.The present application realizes the flexible switching of single audio channel and double audio channel through load module, control module, switching module, single-channel switch module and double-channel switch module.

Description

Technical Field

[0001] This invention relates to the field of power amplifier output technology, and in particular to a power amplifier switching control circuit, electronic device and method. Background Technology

[0002] With societal progress and increasing car ownership, car entertainment systems have gained widespread attention, leading to higher demands for car audio sound quality. Currently, common Class D amplifiers with single-channel outputs have limited power and load capacity due to having only one audio channel, failing to meet the demands of high-power and high-fidelity audio output. Existing technology includes Class D amplifier ICs (Integrated Circuits) that support dual audio channel output, such as the TAS6584 amplifier IC, which can enhance load capacity and power output by connecting two audio channels in parallel. However, due to its fixed hardware configuration, the TAS6584 amplifier IC only supports dual audio channel output. Therefore, a solution is urgently needed to achieve flexible switching between single and dual audio channels in applications requiring single and dual audio channel switching. Summary of the Invention

[0003] In view of this, the present invention aims to provide a power amplifier switching control circuit, electronic device and method to achieve flexible switching between single audio channel and dual audio channel.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] A power amplifier switching control circuit includes a load module, a control module, a switching module, a single-channel switch module, and a dual-channel switch module. The control module is connected to the switching module. The switching module is connected to the load module, the single-channel switch module, and the dual-channel switch module respectively. The single-channel switch module is connected to the dual-channel switch module. The load module is connected to both the single-channel switch module and the dual-channel switch module. Both the single-channel switch module and the dual-channel switch module are controlled by the control module.

[0006] The control module is used to generate a level signal. When the level signal is a high level signal, the single-channel switch module is turned on, the dual-channel switch module is turned off, the switching module is turned off, and the power amplifier switching control circuit is in single-channel output mode. When the level signal is a low level signal, the single-channel switch module is turned off, the dual-channel switch module is turned on, the switching module is turned on, and the power amplifier switching control circuit is in dual-channel output mode.

[0007] Furthermore, the control module includes a signal generation unit and an optocoupler driving unit. The signal generation unit is connected to the optocoupler driving unit, and the optocoupler driving unit is connected to the switching module. The signal generation unit generates the level signal. When the level signal is a high-level signal, the optocoupler driving unit is turned on and the switching module is turned off. When the level signal is a low-level signal, the optocoupler driving unit is turned off and the switching module is turned on.

[0008] Furthermore, the signal generating unit includes a first voltage source and a voltage divider resistor, and the optocoupler driving unit includes a first optocoupler and a second optocoupler. The negative terminal of the primary light-emitting diode of the first optocoupler and the positive terminal of the primary light-emitting diode of the second optocoupler are both grounded. The positive terminal of the primary light-emitting diode of the first optocoupler and the negative terminal of the primary light-emitting diode of the second optocoupler are both connected to one end of the voltage divider resistor. The other end of the voltage divider resistor is connected to the positive terminal of the first voltage source. The negative terminal of the first voltage source is grounded. The secondary phototransistors of the first optocoupler and the second optocoupler are both connected to the switching module.

[0009] Furthermore, the optocoupler driving unit includes a first optocoupler and a second optocoupler, and the switching module includes a first switching unit and a second switching unit. The first switching unit is connected to the first optocoupler, and the second switching unit is connected to the second optocoupler. The first switching unit and the second switching unit are connected through a first resistor.

[0010] The first switching unit is connected to the load module, the single-channel switch module and the dual-channel switch module respectively, and the second switching unit is connected to the load module, the single-channel switch module and the dual-channel switch module respectively.

[0011] Furthermore, the first switching unit includes a first unidirectional conducting diode, a first capacitor, a second resistor, a first Zener diode, a first MOSFET, and a second MOSFET; the second switching unit includes a second unidirectional conducting diode, a second capacitor, a third resistor, a second Zener diode, a third MOSFET, and a fourth MOSFET.

[0012] The source of the first MOSFET and the source of the second MOSFET are both connected to the first optocoupler. The gate of the first MOSFET and the gate of the second MOSFET are both connected to the first optocoupler. The drain of the first MOSFET is connected to the anode of the first unidirectional diode. The cathode of the first unidirectional diode is connected to the first optocoupler through a first capacitor. The first optocoupler is connected to the anode of the first Zener diode. The first Zener diode is connected to the cathode of the first unidirectional diode through a second resistor. The anode of the first unidirectional diode is connected to both the single-channel switch module and the dual-channel switch module. The drain of the second MOSFET is connected to the load module.

[0013] The source of the fourth MOSFET and the source of the third MOSFET are both connected to the second optocoupler. The gate of the fourth MOSFET and the gate of the third MOSFET are both connected to the second optocoupler. The drain of the fourth MOSFET is connected to the anode of the second unidirectional diode. The cathode of the second unidirectional diode is connected to the second optocoupler through the second capacitor. The second optocoupler is connected to the anode of the second Zener diode. The second Zener diode is connected to the cathode of the second unidirectional diode through the third resistor. The anode of the second unidirectional diode is connected to both the single-channel switch module and the dual-channel switch module. The drain of the third MOSFET is connected to the load module.

[0014] The positive terminal of the first Zener diode is connected to the positive terminal of the second Zener diode through the first resistor;

[0015] When the signal level signal emitted by the signal generating unit is a high-level signal, the first optocoupler and the second optocoupler are turned on, the voltage across the second Zener diode and the first Zener diode becomes low, and the first MOSFET, the second MOSFET, the third MOSFET and the fourth MOSFET are all turned off. When the signal level signal emitted by the signal generating unit is a low-level signal, the first optocoupler and the second optocoupler are turned off, the voltage across the second Zener diode and the first Zener diode becomes high, and the first MOSFET, the second MOSFET, the third MOSFET and the fourth MOSFET are all turned on.

[0016] Furthermore, the load module includes a first speaker resistor, a second speaker resistor, and a third speaker resistor. The two ends of the second speaker resistor are respectively connected to the first switching unit and the second switching unit. The third speaker resistor is connected to the second switching unit through a fourth resistor. The first speaker resistor is connected to the first switching unit through a fifth resistor.

[0017] Furthermore, the single-channel switch module includes a second voltage source, a third voltage source, a first switch, a second switch, a fourth voltage source, a fifth voltage source, a third switch, and a fourth switch; the dual-channel switch module includes a sixth voltage source, a seventh voltage source, a fifth switch, a sixth switch, a seventh switch, and an eighth switch.

[0018] The negative terminal of the second voltage source and the positive terminal of the third voltage source are both grounded. The positive terminal of the second voltage source is connected to one end of the first switch, and the negative terminal of the third voltage source is connected to one end of the second switch. The other end of the first switch and the other end of the second switch are connected through the fifth switch. The other end of the first switch is connected to one end of the first speaker resistor through the sixth resistor, and the other end of the second switch is connected to the other end of the first speaker resistor through the fifth resistor.

[0019] The positive terminal of the fourth voltage source and the negative terminal of the fifth voltage source are both grounded. The negative terminal of the fourth voltage source is connected to one end of the fourth switch. The positive terminal of the fifth voltage source is connected to one end of the third switch. The other end of the third switch is connected to the other end of the fourth switch through the eighth switch. The other end of the fourth switch is connected to one end of the third speaker resistor through the seventh resistor. The other end of the third switch is connected to the other end of the third speaker resistor through the fourth resistor.

[0020] The negative terminal of the sixth voltage source and the positive terminal of the seventh voltage source are both grounded. The positive terminal of the sixth voltage source is connected to one end of the sixth switch. The other end of the sixth switch is connected to one end of the fifth switch. The other end of the fifth switch is connected to one end of the first speaker resistor through the sixth resistor. One end of the fifth switch is connected to the other end of the first speaker resistor through the fifth resistor.

[0021] The negative terminal of the seventh voltage source is connected to one end of the seventh switch, the other end of the seventh switch is connected to one end of the eighth switch, the other end of the eighth switch is connected to one end of the third speaker resistor through the seventh resistor, and one end of the eighth switch is connected to the other end of the third speaker resistor through the fourth resistor.

[0022] The first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch are all controlled by the level signal generated by the signal generating unit. When the level signal is a high level signal, the first switch, the second switch, the third switch, and the fourth switch are turned on, and the fifth switch, the sixth switch, the seventh switch, and the eighth switch are turned off. When the level signal is a low level signal, the first switch, the second switch, the third switch, and the fourth switch are turned off, and the fifth switch, the sixth switch, the seventh switch, and the eighth switch are turned on.

[0023] Furthermore, the other end of the first switch is connected to one end of the second speaker resistor through the sixth resistor, the other end of the second switch is connected to the first switching unit, the other end of the fourth switch is connected to the other end of the second speaker resistor through the seventh resistor, and the other end of the third switch is connected to the second switching unit.

[0024] Compared with the prior art, the power amplifier switching control circuit of the present invention has the following advantages: by connecting the control module and the switching module, and the switching module being connected to the load module, the single-channel switch module and the dual-channel switch module respectively, when the control module sends a high-level signal, the single-channel switch module is turned on, and both the dual-channel switch module and the switching module are turned off, so that the power amplifier switching control circuit is in single-channel output mode; when the control module sends a low-level signal, the single-channel switch module is turned off, and both the dual-channel switch module and the switching module are turned on, so that the power amplifier switching control circuit is in dual-channel output mode, thus realizing flexible switching between single audio channel and dual audio channel.

[0025] Another object of the present invention is to provide an electronic device including the above-mentioned power amplifier switching control circuit.

[0026] Another objective of this invention is to propose a power amplifier switching control method to achieve flexible switching between single-audio channels and dual-audio channels.

[0027] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0028] A power amplifier switching control method, comprising:

[0029] The control module generates a level signal;

[0030] When the level signal is a high level signal, the single-channel switch module is turned on, and the dual-channel switch module and the switching module are both turned off, switching the power amplifier switching control circuit to single-channel output mode;

[0031] When the level signal is a low level signal, the single-channel switch module is turned off, and both the dual-channel switch module and the switching module are turned on, switching the power amplifier switching control circuit to dual-channel output mode.

[0032] Compared with existing technologies, the power amplifier switching control method of the present invention has the following advantages: when the level signal generated by the control module is a high level signal, the single-channel switch module is turned on, and the dual-channel switch module and the switching module are both turned off. At this time, the power amplifier switching control circuit switches to single-channel output mode; when the level signal generated by the control module is a low level signal, the single-channel switch module is turned off, and the dual-channel switch module and the switching module are both turned on. At this time, the power amplifier switching control circuit switches to dual-channel output mode, realizing flexible switching between single audio channel and dual audio channel.

[0033] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0034] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0035] Figure 1 This is an overall circuit diagram of the power amplifier switching control circuit described in an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1-Load module; 2-Control module; 3-Switching module; 4-Single-channel switch module; 5-Dual-channel switch module. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0039] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] This application discloses a power amplifier switching control circuit.

[0041] Reference Figure 1 A power amplifier switching control circuit includes a load module 1, a control module 2, a switching module 3, a single-channel switch module 4, and a dual-channel switch module 5. The control module 2 is connected to the switching module 3. The switching module 3 is connected to the load module 1, the single-channel switch module 4, and the dual-channel switch module 5, respectively. The single-channel switch module 4 is connected to the dual-channel switch module 5, and the load module 1 is connected to the single-channel switch module 4 and the dual-channel switch module 5, respectively.

[0042] The control module 2 generates a level signal. Both the single-channel switch module 4 and the dual-channel switch module 5 are controlled by the control module 2. Specifically, when the level signal generated by the control module 2 is a high-level signal, the single-channel switch module 4 is turned on and the dual-channel switch module 5 is turned off. At this time, the load module 1 is only connected to the single-channel switch module 4, thus enabling the power amplifier switching control circuit to operate in single-channel output mode. When the level signal generated by the control module 2 is a low-level signal, the single-channel switch module 4 is turned off and the dual-channel switch module 5 is turned on. At this time, the load module 1 is connected to the dual-channel switch module 5, thus enabling the power amplifier switching control circuit to operate in dual-channel output mode, achieving flexible switching between single-audio channel and dual-audio channel.

[0043] Specifically, control module 2 includes a signal generation unit and an optocoupler driving unit. The signal generation unit is used to emit a level signal and is connected to the optocoupler driving unit. The optocoupler driving unit is used to turn on or off according to the level signal emitted by the signal generation unit. The optocoupler driving unit is connected to the switching module 3. When the level signal emitted by the signal generation unit is a high level signal, the optocoupler driving unit is turned on, and the switching module 3 is turned off. Since both the single-channel switch module 4 and the dual-channel switch module 5 are controlled by control module 2, the single-channel switch module 4 is turned on and the dual-channel switch module 5 is turned off. Furthermore, due to the switching... When module 3 is turned off, load module 1 is connected only to single-channel switch module 4, making the power amplifier switching control circuit a single-channel output mode. When the signal generated by the signal generation unit is a low-level signal, the optocoupler drive unit is turned off, and switching module 3 is turned on. Since both single-channel switch module 4 and dual-channel switch module 5 are controlled by control module 2, single-channel switch module 4 is turned off, and dual-channel switch module 5 is turned on. Since switching module 3 is turned on, load module 1 is connected to dual-channel switch module 5 through switching module 3, causing the power amplifier switching control circuit to switch from single-channel output mode to dual-channel output mode.

[0044] Reference Figure 1 The signal generation unit includes a first voltage source B1 and a voltage divider resistor R1. The first switching unit and the second switching unit are connected through a first resistor R2. The optocoupler driving unit includes a first optocoupler U1 and a second optocoupler U2. The negative terminal of the primary light-emitting diode of the first optocoupler U1 and the positive terminal of the primary light-emitting diode of the second optocoupler U2 are both grounded. The positive terminal of the primary light-emitting diode of the first optocoupler U1 and the negative terminal of the primary light-emitting diode of the second optocoupler U2 are both connected to one end of the voltage divider resistor R1. The other end of the voltage divider resistor R1 is connected to the positive terminal of the first voltage source B1. The negative terminal of the first voltage source B1 is grounded. The secondary phototransistors of the first optocoupler U1 and the second optocoupler U2 are both connected to the switching module 3.

[0045] Specifically, the first voltage source B1 is used to generate a voltage level signal. When the voltage level signal is high, current flows through the first optocoupler U1 and the second optocoupler U2. The primary LEDs of the first optocoupler U1 and the second optocoupler U2 both emit light. At this time, the secondary phototransistors of the first optocoupler U1 and the second optocoupler U2 both sense the light and generate current, causing both optocouplers U1 and U2 to conduct. When the voltage level signal is low, no current flows through the primary LEDs of the first optocoupler U1 and the second optocoupler U2. At this time, the primary LEDs of the first optocoupler U1 and the second optocoupler U2 do not emit light, and the secondary phototransistors of the first optocoupler U1 and the second optocoupler U2 do not sense the light, causing both optocouplers U1 and U2 to turn off.

[0046] The switching module 3 includes a first switching unit and a second switching unit. The first switching unit is connected to the first optocoupler U1, and the second switching unit is connected to the second optocoupler U2. The first switching unit and the second switching unit are connected through a first resistor R2. The first switching unit is connected to the load module 1, the single-channel switch module 4 and the dual-channel switch module 5 respectively. The second switching unit is connected to the load module 1, the single-channel switch module 4 and the dual-channel switch module 5 respectively.

[0047] When both the first optocoupler U1 and the second optocoupler U2 are turned on, both the first switching unit and the second switching unit are turned off. At this time, the load module 1 is only connected to the single-channel module, and the power amplifier switching control circuit is in single-channel output mode. When both the first optocoupler U1 and the second optocoupler U2 are turned off, both the first switching unit and the second switching unit are turned on. At this time, the load module 1 is connected to the dual-channel module through the switching module 3, and the power amplifier switching control circuit is in dual-channel output mode.

[0048] Specifically, the first switching unit includes a first unidirectional conducting diode D1, a first capacitor C1, a second resistor R3, a first Zener diode D2, a first MOSFET M1, and a second MOSFET M2, and the second switching unit includes a second unidirectional conducting diode D3, a second capacitor C2, a third resistor R4, a second Zener diode D4, a third MOSFET M3, and a fourth MOSFET M4.

[0049] The source of the first MOSFET M1 and the source of the second MOSFET M2 are both connected to the first optocoupler U1. The gate of the first MOSFET M1 and the gate of the second MOSFET M2 are both connected to the first optocoupler U1. The drain of the first MOSFET M1 is connected to the anode of the first unidirectional diode D1. The cathode of the first unidirectional diode D1 is connected to the first optocoupler U1 through the first capacitor C1. The first optocoupler U1 is connected to the anode of the first Zener diode D2. The first Zener diode D2 is connected to the cathode of the first unidirectional diode D1 through the second resistor R3. The anode of the first unidirectional diode D1 is connected to the single-channel switch module 4 and the dual-channel switch module 5, respectively. The drain of the second MOSFET M2 is connected to the load module 1.

[0050] The source of the fourth MOSFET M4 and the source of the third MOSFET M3 are both connected to the second optocoupler U2. The gate of the fourth MOSFET M4 and the gate of the third MOSFET M3 are both connected to the second optocoupler U2. The drain of the fourth MOSFET M4 is connected to the anode of the second unidirectional diode D3. The cathode of the second unidirectional diode D3 is connected to the second optocoupler U2 through the second capacitor C2. The second optocoupler U2 is connected to the anode of the second Zener diode D4. The second Zener diode D4 is connected to the cathode of the second unidirectional diode D3 through the third resistor R4. The anode of the second unidirectional diode D3 is connected to the single-channel switch module 4 and the dual-channel switch module 5, respectively. The drain of the third MOSFET M3 is connected to the load module 1. The anode of the first Zener diode D2 is connected to the anode of the second Zener diode D4 through the first resistor R2.

[0051] When the voltage signal emitted by the first voltage source B1 is a high-level signal, the first optocoupler U1 and the second optocoupler U2 are turned on, the voltage across the second Zener diode D4 and the first Zener diode D2 becomes low-level, and the first MOSFET M1, the second MOSFET M2, the third MOSFET M3 and the fourth MOSFET M4 are all turned off, thereby turning off both the first switching module and the second switching module; when the voltage signal emitted by the first voltage source B1 is a low-level signal, the first optocoupler U1 and the second optocoupler U2 are turned off, the voltage across the second Zener diode D4 and the first Zener diode D2 becomes high-level, and the first MOSFET M1, the second MOSFET M2, the third MOSFET M3 and the fourth MOSFET M4 are all turned on, thereby turning on both the first switching module and the second switching module.

[0052] Reference Figure 1 The load module 1 includes a first speaker resistor R5, a second speaker resistor R6 and a third speaker resistor R7. The two ends of the second speaker resistor R6 are respectively connected to the first switching unit and the second switching unit. The third speaker resistor R7 is connected to the second switching unit through a fourth resistor R8. The first speaker resistor R5 is connected to the first switching unit through a fifth resistor R9.

[0053] When both the first and second switching units are off, the single-channel switch module 4 is on, the dual-channel switch module 5 is off, the second speaker resistor R6 is disconnected from the dual-channel switch module 5, and the first speaker resistor R5 and the third speaker resistor R7 are both connected to the single-channel switch module 4. At this time, the first speaker resistor R5 and the third speaker resistor R7 are both outputs independently, and the power amplifier switching control circuit is in single-channel output mode. When both the first and second switching units are on, the single-channel switch module 4 is off, the dual-channel switch module 5 is on, and the third speaker resistor R7, the first speaker resistor R5, and the second speaker resistor R6 are all connected to the dual-channel switch module 5. At this time, the first speaker resistor R5 is shorted as one end of the second speaker resistor R6, and the two ends of the third speaker resistor R7 are shorted as the other end of the second speaker resistor R6. The power amplifier switching control circuit is in dual-channel output mode.

[0054] The single-channel switch module 4 includes a second voltage source B2, a third voltage source B3, a first switch S1, a second switch S2, a fourth voltage source B4, a fifth voltage source B5, a third switch S3, and a fourth switch S4. The dual-channel switch module includes a sixth voltage source B6, a seventh voltage source B7, a fifth switch S5, a sixth switch S6, a seventh switch S7, and an eighth switch S8.

[0055] The negative terminal of the second voltage source B2 and the positive terminal of the third voltage source B3 are both grounded. The positive terminal of the second voltage source B2 is connected to one end of the first switch S1, and the negative terminal of the third voltage source B3 is connected to one end of the second switch S2. The other end of the first switch S1 and the other end of the second switch S2 are connected through the fifth switch S5. The other end of the first switch S1 is connected to one end of the first speaker resistor R5 through the sixth resistor R10, and the other end of the second switch S2 is connected to the other end of the first speaker resistor R5 through the fifth resistor R9.

[0056] The positive terminal of the fourth voltage source B4 and the negative terminal of the fifth voltage source B5 are both grounded. The negative terminal of the fourth voltage source B4 is connected to one end of the fourth switch S4. The positive terminal of the fifth voltage source B5 is connected to one end of the third switch S3. The other end of the third switch S3 is connected to the other end of the fourth switch S4 through the eighth switch S8. The other end of the fourth switch S4 is connected to one end of the third speaker resistor R7 through the seventh resistor R11. The other end of the third switch S3 is connected to the other end of the third speaker resistor R7 through the fourth resistor R8.

[0057] The negative terminal of the sixth voltage source B6 and the positive terminal of the seventh voltage source B7 are both grounded. The positive terminal of the sixth voltage source B6 is connected to one end of the sixth switch S6. The other end of the sixth switch S6 is connected to one end of the fifth switch S5. The other end of the fifth switch S5 is connected to one end of the first speaker resistor R5 through the sixth resistor R10. One end of the fifth switch S5 is connected to the other end of the first speaker resistor R5 through the fifth resistor R9.

[0058] The negative terminal of the seventh voltage source B7 is connected to one end of the seventh switch S7, the other end of the seventh switch S7 is connected to one end of the eighth switch S8, the other end of the eighth switch S8 is connected to one end of the third speaker resistor R7 through the seventh resistor R11, and one end of the eighth switch S8 is connected to the other end of the third speaker resistor R7 through the fourth resistor R8.

[0059] The first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, the sixth switch S6, the seventh switch S7, and the eighth switch S8 are all controlled by the level signal generated by the signal generating unit. When the level signal is a high level signal, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are turned on, and the fifth switch S5, the sixth switch S6, the seventh switch S7, and the eighth switch S8 are turned off. When the level signal is a low level signal, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are turned off, and the fifth switch S5, the sixth switch S6, the seventh switch S7, and the eighth switch S8 are turned on.

[0060] The other end of the first switch S1 is connected to one end of the second speaker resistor R6 through the sixth resistor R10. The other end of the second switch S2 is connected to the first switching unit. The other end of the fourth switch S4 is connected to the other end of the second speaker resistor R6 through the seventh resistor R11. The other end of the third switch S3 is connected to the second switching unit.

[0061] Specifically, when the voltage signal emitted by the first voltage source B1 is a high-level signal, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are turned on, while the fifth switch S5, the sixth switch S6, the seventh switch S7, and the eighth switch S8 are turned off, and the switching module 3 is turned off. The second voltage source B2 acts as the positive terminal of the first speaker resistor R5, the third voltage source B3 acts as the negative terminal of the second speaker resistor R6, the fourth voltage source B4 acts as the positive terminal of the third speaker resistor R7, and the fifth voltage source B5 acts as the negative terminal of the third speaker resistor R7. At this time, both the first speaker resistor R5 and the third speaker resistor R7 are... For independent output, the power amplifier switching control circuit is in single-channel output mode. When the level signal emitted by the first voltage source B1 is a low level signal, the first switch S1, the second switch S2, the third switch S3 and the fourth switch S4 are turned off, and the fifth switch S5, the sixth switch S6, the seventh switch S7 and the eighth switch S8 are turned on. The switching module 3 is turned on. The sixth voltage source B6 is used as the positive terminal of the second speaker resistor R6 through the short circuit of the first speaker resistor R5, and the seventh voltage source B7 is used as the negative terminal of the second speaker resistor R6 through the short circuit of the third speaker resistor R7. At this time, the power amplifier switching control circuit is in dual-channel output mode.

[0062] The specific connection relationship between the optocoupler drive unit and the switching module 3 is as follows:

[0063] The source of the first MOSFET M1 and the source of the second MOSFET M2 are both connected to the first optocoupler U1. The gate of the first MOSFET M1 and the gate of the second MOSFET M2 are both connected to the first optocoupler U1. The drain of the first MOSFET M1 is connected to the anode of the first unidirectional diode D1. The cathode of the first unidirectional diode D1 is connected to the first optocoupler U1 through the first capacitor C1. The first optocoupler U1 is connected to the anode of the first Zener diode D2. The cathode of the first Zener diode D2 is connected to the cathode of the first unidirectional diode D1 through the second resistor R3.

[0064] The source of the fourth MOSFET M4 and the source of the third MOSFET M3 are both connected to the second optocoupler U2. The gate of the fourth MOSFET M4 and the gate of the third MOSFET M3 are both connected to the second optocoupler U2. The drain of the fourth MOSFET M4 is connected to the anode of the second unidirectional diode D3. The cathode of the second unidirectional diode D3 is connected to the second optocoupler U2 through the second capacitor C2. The second optocoupler U2 is connected to the anode of the second Zener diode D4. The cathode of the second Zener diode D4 is connected to the cathode of the second unidirectional diode D3 through the third resistor R4. The anode of the first Zener diode D2 is connected to the anode of the second Zener diode D4 through the first resistor R2.

[0065] The specific connection relationships between the first MOSFET M1, the second MOSFET M2, the third MOSFET M3, and the fourth MOSFET M4 of the switching module 3 and the load module 1 are as follows:

[0066] The two ends of the second speaker resistor R6 are connected to the drain of the second MOSFET M2 and the drain of the third MOSFET M3, respectively. The drain of the fourth MOSFET M4 is connected to the third speaker resistor R7 through the fourth resistor R8. The drain of the first MOSFET M1 is connected to the first speaker resistor R5 through the fifth resistor R9.

[0067] It should be noted that the first speaker resistor R5, the fifth resistor R9, and the sixth resistor R10 represent the first load path CH1, the third speaker resistor R7, the seventh resistor R11, and the fourth resistor R8 represent the second load path CH2, and the second speaker resistor R6, the sixth resistor R10, and the seventh resistor R11 represent the third load path CH3.

[0068] The following is a detailed description of the power amplifier switching control circuit in this application, which switches between single-channel output mode and dual-channel output mode:

[0069] When the voltage signal emitted by the first voltage source B1 is a high-level signal, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are turned on, while the fifth switch S5, the sixth switch S6, the seventh switch S7, and the eighth switch S8 are turned off. Current flows through the primary LEDs of the first optocoupler U1 and the second optocoupler U2, causing them to emit light. The secondary phototransistors of the first optocoupler U1 and the second optocoupler U2 both receive light and generate photocurrent. The first optocoupler U1 and the second optocoupler U2 are turned on, and the voltages across the second Zener diode D4 and the first Zener diode D2 become low. The first MOSFET M1, the second MOSFET M2, the third MOSFET M3, and the fourth MOSFET M4 are all turned off. At this time, the first load path and the second load path are in independent output mode, meaning the power amplifier switching control circuit is a single channel. In the output mode, the second voltage source B2 acts as the negative terminal of the first load path, outputting to one end of the first speaker resistor R5. The third voltage source B3 acts as the positive terminal of the first load path, outputting to the other end of the first speaker resistor R5. The fourth voltage source B4 acts as the positive terminal of the second load path, outputting to one end of the third speaker resistor R7. The fifth voltage source B5 acts as the negative terminal of the second load path, outputting to the other end of the third speaker resistor R7. Since the first MOSFET M1, second MOSFET M2, third MOSFET M3, and fourth MOSFET M4 are all turned off at this time, there is no signal output from the third load path. The first load path outputs a differential signal, i.e., the signal from the third voltage source B3 minus the signal from the second voltage source B2. The second load path also outputs a differential signal, i.e., the signal from the fifth voltage source B5 minus the signal from the fourth voltage source B4. In this embodiment, the first voltage source B1, the second voltage source B2, the third voltage source B3, the fourth voltage source B4, the fifth voltage source B5, the sixth voltage source B6, and the seventh voltage source B7 are all signal sources.

[0070] When the voltage signal emitted by the first voltage source B1 is low, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are turned off, while the fifth switch S5, the sixth switch S6, the seventh switch S7, and the eighth switch S8 are turned on. No current flows through the primary LEDs of the first optocoupler U1 and the second optocoupler U2. No photocurrent is induced in the secondary phototransistors of the first optocoupler U1 and the second optocoupler U2. The first optocoupler U1 and the second optocoupler U2 are turned off, and the voltages across the second Zener diode D4 and the first Zener diode D2 become high. The first MOSFET M1 and the second MOSFET... M2, the third MOSFET M3, and the fourth MOSFET M4 are all turned on. At this time, the first load path, the second load path, and the third load path are in a dual-channel parallel output mode, that is, the power amplifier switching control circuit is in a dual-channel output mode. The sixth voltage source B6 will short-circuit the CH1P and CH1N terminals of the first load path CH1 to serve as the CH3P terminal of the third load path CH3. The seventh voltage source B7 will short-circuit the CH2P and CH2N terminals of the second load path CH2 to serve as the CH3N terminal of the third load path CH3. The third load path outputs a differential signal, that is, the signal emitted by the seventh voltage source B7 minus the signal emitted by the sixth voltage source B6.

[0071] By switching between the single-channel output mode and the dual-channel output mode, flexible switching between single audio channels and dual audio channels can be achieved.

[0072] This application also discloses an electronic device, which includes... Figure 1 The power amplifier switching control circuit shown includes a load module 1, a control module 2, a switching module 3, a single-channel switch module 4, and a dual-channel switch module 5. The control module 2 is connected to the switching module 3. The switching module 3 is connected to the load module 1, the single-channel switch module 4, and the dual-channel switch module 5 respectively. The single-channel switch module 4 is connected to the dual-channel switch module 5. The load module 1 is connected to both the single-channel switch module 4 and the dual-channel switch module 5. The control module 2 generates the level signal. Both the single-channel switch module 4 and the dual-channel switch module 5 are controlled by the control module. 2. Specifically, when the level signal generated by the control module 2 is a high-level signal, the single-channel switch module 4 is turned on and the dual-channel switch module 5 is turned off. At this time, the load module 1 is only connected to the single-channel switch module 4, thereby making the power amplifier switching control circuit a single-channel output mode. When the level signal generated by the control module 2 is a low-level signal, the single-channel switch module 4 is turned off and the dual-channel switch module 5 is turned on. At this time, the load module 1 is connected to the dual-channel switch module 5, thereby making the power amplifier switching control circuit a dual-channel output mode, making the switching between single audio channels and dual audio channels more flexible.

[0073] This application also discloses a power amplifier switching control method.

[0074] A power amplifier switching control method, comprising:

[0075] The control module generates level signals;

[0076] When the level signal is a high level signal, the single-channel switch module is turned on, and the dual-channel switch module and the switching module are both turned off, switching the power amplifier switching control circuit to single-channel output mode.

[0077] When the level signal is low, the single-channel switch module is turned off, and both the dual-channel switch module and the switching module are turned on, switching the power amplifier switching control circuit to dual-channel output mode.

[0078] When the level signal generated by the control module is a high level signal, the single-channel switch module is turned on, and the dual-channel switch module and the switching module are both turned off. At this time, the power amplifier switching control circuit switches to single-channel output mode. When the level signal generated by the control module is a low level signal, the single-channel switch module is turned off, and the dual-channel switch module and the switching module are both turned on. At this time, the power amplifier switching control circuit switches to dual-channel output mode, realizing flexible switching between single audio channel and dual audio channel.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A power amplifier switching control circuit, characterized in that: It includes a load module (1), a control module (2), a switching module (3), a single-channel switch module (4), and a dual-channel switch module (5). The control module (2) is connected to the switching module (3). The switching module (3) is connected to the load module (1), the single-channel switch module (4), and the dual-channel switch module (5) respectively. The single-channel switch module (4) is connected to the dual-channel switch module (5). The load module (1) is connected to the single-channel switch module (4) and the dual-channel switch module (5) respectively. The single-channel switch module (4) and the dual-channel switch module (5) are both controlled by the control module (2). The control module (2) is used to generate a level signal. When the level signal is a high level signal, the single-channel switch module (4) is turned on, the dual-channel switch module (5) is turned off, the switching module (3) is turned off, and the power amplifier switching control circuit is in single-channel output mode. When the level signal is a low level signal, the single-channel switch module (4) is turned off, the dual-channel switch module (5) is turned on, the switching module (3) is turned on, and the power amplifier switching control circuit is in dual-channel output mode.

2. The power amplifier switching control circuit according to claim 1, characterized in that: The control module (2) includes a signal generating unit and an optocoupler driving unit. The signal generating unit is connected to the optocoupler driving unit, and the optocoupler driving unit is connected to the switching module (3). The signal generating unit generates the level signal. When the level signal is a high level signal, the optocoupler driving unit is turned on and the switching module (3) is turned off. When the level signal is a low level signal, the optocoupler driving unit is turned off and the switching module (3) is turned on.

3. The power amplifier switching control circuit according to claim 2, characterized in that: The signal generating unit includes a first voltage source and a voltage divider resistor. The optocoupler driving unit includes a first optocoupler and a second optocoupler. The negative terminal of the primary light-emitting diode of the first optocoupler and the positive terminal of the primary light-emitting diode of the second optocoupler are both grounded. The positive terminal of the primary light-emitting diode of the first optocoupler and the negative terminal of the primary light-emitting diode of the second optocoupler are both connected to one end of the voltage divider resistor. The other end of the voltage divider resistor is connected to the positive terminal of the first voltage source. The negative terminal of the first voltage source is grounded. The secondary phototransistors of the first optocoupler and the second optocoupler are both connected to the switching module (3).

4. The power amplifier switching control circuit according to claim 2, characterized in that: The optocoupler driving unit includes a first optocoupler and a second optocoupler, and the switching module (3) includes a first switching unit and a second switching unit. The first switching unit is connected to the first optocoupler, and the second switching unit is connected to the second optocoupler. The first switching unit and the second switching unit are connected through a first resistor. The first switching unit is connected to the load module (1), the single-channel switch module (4) and the dual-channel switch module (5) respectively, and the second switching unit is connected to the load module (1), the single-channel switch module (4) and the dual-channel switch module (5) respectively.

5. The power amplifier switching control circuit according to claim 4, characterized in that: The first switching unit includes a first unidirectional conducting diode, a first capacitor, a second resistor, a first Zener diode, a first MOSFET, and a second MOSFET; the second switching unit includes a second unidirectional conducting diode, a second capacitor, a third resistor, a second Zener diode, a third MOSFET, and a fourth MOSFET. The source of the first MOS transistor and the source of the second MOS transistor are both connected to the first optocoupler. The gate of the first MOS transistor and the gate of the second MOS transistor are both connected to the first optocoupler. The drain of the first MOS transistor is connected to the anode of the first unidirectional diode. The cathode of the first unidirectional diode is connected to the first optocoupler through the first capacitor. The first optocoupler is connected to the anode of the first Zener diode. The first Zener diode is connected to the cathode of the first unidirectional diode through the second resistor. The anode of the first unidirectional diode is connected to the single-channel switch module (4) and the dual-channel switch module (5) respectively. The drain of the second MOS transistor is connected to the load module (1). The source of the fourth MOS transistor and the source of the third MOS transistor are both connected to the second optocoupler. The gate of the fourth MOS transistor and the gate of the third MOS transistor are both connected to the second optocoupler. The drain of the fourth MOS transistor is connected to the anode of the second unidirectional diode. The cathode of the second unidirectional diode is connected to the second optocoupler through the second capacitor. The second optocoupler is connected to the anode of the second Zener diode. The second Zener diode is connected to the cathode of the second unidirectional diode through the third resistor. The anode of the second unidirectional diode is connected to the single-channel switch module (4) and the dual-channel switch module (5) respectively. The drain of the third MOS transistor is connected to the load module (1). The positive terminal of the first Zener diode is connected to the positive terminal of the second Zener diode through the first resistor; When the signal level signal emitted by the signal generating unit is a high-level signal, the first optocoupler and the second optocoupler are turned on, the voltage across the second Zener diode and the first Zener diode becomes low, and the first MOSFET, the second MOSFET, the third MOSFET and the fourth MOSFET are all turned off. When the signal level signal emitted by the signal generating unit is a low-level signal, the first optocoupler and the second optocoupler are turned off, the voltage across the second Zener diode and the first Zener diode becomes high, and the first MOSFET, the second MOSFET, the third MOSFET and the fourth MOSFET are all turned on.

6. The power amplifier switching control circuit according to claim 4, characterized in that: The load module (1) includes a first speaker resistor, a second speaker resistor and a third speaker resistor. The two ends of the second speaker resistor are respectively connected to the first switching unit and the second switching unit. The third speaker resistor is connected to the second switching unit through a fourth resistor. The first speaker resistor is connected to the first switching unit through a fifth resistor.

7. The power amplifier switching control circuit according to claim 6, characterized in that: The single-channel switch module (4) includes a second voltage source, a third voltage source, a first switch, a second switch, a fourth voltage source, a fifth voltage source, a third switch, and a fourth switch; the dual-channel switch module (5) includes a sixth voltage source, a seventh voltage source, a fifth switch, a sixth switch, a seventh switch, and an eighth switch. The negative terminal of the second voltage source and the positive terminal of the third voltage source are both grounded. The positive terminal of the second voltage source is connected to one end of the first switch, and the negative terminal of the third voltage source is connected to one end of the second switch. The other end of the first switch and the other end of the second switch are connected through the fifth switch. The other end of the first switch is connected to one end of the first speaker resistor through the sixth resistor, and the other end of the second switch is connected to the other end of the first speaker resistor through the fifth resistor. The positive terminal of the fourth voltage source and the negative terminal of the fifth voltage source are both grounded. The negative terminal of the fourth voltage source is connected to one end of the fourth switch. The positive terminal of the fifth voltage source is connected to one end of the third switch. The other end of the third switch is connected to the other end of the fourth switch through the eighth switch. The other end of the fourth switch is connected to one end of the third speaker resistor through the seventh resistor. The other end of the third switch is connected to the other end of the third speaker resistor through the fourth resistor. The negative terminal of the sixth voltage source and the positive terminal of the seventh voltage source are both grounded. The positive terminal of the sixth voltage source is connected to one end of the sixth switch. The other end of the sixth switch is connected to one end of the fifth switch. The other end of the fifth switch is connected to one end of the first speaker resistor through the sixth resistor. One end of the fifth switch is connected to the other end of the first speaker resistor through the fifth resistor. The negative terminal of the seventh voltage source is connected to one end of the seventh switch, the other end of the seventh switch is connected to one end of the eighth switch, the other end of the eighth switch is connected to one end of the third speaker resistor through the seventh resistor, and one end of the eighth switch is connected to the other end of the third speaker resistor through the fourth resistor. The first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch are all controlled by the level signal generated by the signal generating unit. When the level signal is a high level signal, the first switch, the second switch, the third switch, and the fourth switch are turned on, and the fifth switch, the sixth switch, the seventh switch, and the eighth switch are turned off. When the level signal is a low level signal, the first switch, the second switch, the third switch, and the fourth switch are turned off, and the fifth switch, the sixth switch, the seventh switch, and the eighth switch are turned on.

8. The power amplifier switching control circuit according to claim 7, characterized in that: The other end of the first switch is connected to one end of the second speaker resistor through the sixth resistor, the other end of the second switch is connected to the first switching unit, the other end of the fourth switch is connected to the other end of the second speaker resistor through the seventh resistor, and the other end of the third switch is connected to the second switching unit.

9. An electronic device, characterized in that, Includes the power amplifier switching control circuit according to any one of claims 1 to 8.

10. A power amplifier switching control method, characterized in that, The power amplifier switching control circuit according to any one of claims 1 to 8 comprises: The control module generates a level signal; When the level signal is a high level signal, the single-channel switch module is turned on, and the dual-channel switch module and the switching module are both turned off, switching the power amplifier switching control circuit to single-channel output mode; When the level signal is a low level signal, the single-channel switch module is turned off, and both the dual-channel switch module and the switching module are turned on, switching the power amplifier switching control circuit to dual-channel output mode.

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