Control circuit of electronic equipment

Abstract

The embodiment of the utility model relates to the technical field of circuits, in particular to a control circuit of electronic equipment. The control circuit of the electronic equipment comprises a power supply circuit, a control module and an audio detection module, the control module is electrically connected with the power supply circuit and the audio detection module. The power supply circuit is electrically connected with the playing module. When the audio detection module detects that the audio volume sent by the electronic equipment is greater than or equal to a volume threshold, the control module controls the power supply circuit to provide first power supply voltage for the playing module; when the audio detection module detects that the audio volume sent by the electronic equipment is smaller than a volume threshold value, the control module controls the power supply circuit to provide second power supply voltage for the playing module; wherein the first power supply voltage is greater than the second power supply voltage. According to the technical scheme, high voltage can be used for supplying power to the playing module when the volume of the system is high, low voltage can be used for supplying power to the playing module when the volume of the system is low, the efficiency of the sound playing circuit is improved, and power consumption is reduced.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of circuit technology, and in particular to a control circuit of an electronic device. Background Art

[0002] At present, the proportion of entertainment experience in electronic devices is getting higher and higher, and users are paying more and more attention to the audio performance of electronic devices. For example, music players in electronic devices will have buttons to change the volume, and users can adjust the volume at any time according to the buttons, allowing users to experience "immersive" audio and video performance.

[0003] However, in existing electronic devices, regardless of the volume of the playback, the power module provides a constant voltage to the electronic device playback module. When playing sound at a lower volume, the static power consumption is as large as when playing at a higher volume, resulting in low efficiency and high power consumption of the sound playback circuit. Utility Model Content

[0004] Based on this, it is necessary to address the above technical problems. The present application provides a control circuit of an electronic device, which can use a high voltage to power the playback module when the system volume is high, and use a low voltage to power the playback module when the system volume is low, which is beneficial to improving the efficiency of the sound playback circuit and reducing power consumption.

[0005] The present application provides a control circuit of an electronic device, comprising:

[0006] A power supply circuit, a control module and an audio detection module; the control module is electrically connected to the power supply circuit and the audio detection module respectively, and the power supply circuit is electrically connected to the playback module;

[0007] When the audio detection module detects that the audio volume emitted by the electronic device is greater than or equal to the volume threshold, the control module controls the power supply circuit to provide the first power supply voltage to the playback module; when the audio detection module detects that the audio volume emitted by the electronic device is less than the volume threshold, the control module controls the power supply circuit to provide the second power supply voltage to the playback module;

[0008] Wherein, the first supply voltage is greater than the second supply voltage.

[0009] In some embodiments, the power supply circuit includes a gating module and a control module;

[0010] The control end of the gating module is electrically connected to the first control end of the control module, the first input end of the gating module is electrically connected to the first power supply end of the power module, the second input end of the gating module is electrically connected to the second power supply end of the power module, and the output end of the gating module is electrically connected to the playing module;

[0011] The audio detection module detects that the audio volume emitted by the electronic device is greater than or equal to the volume threshold, the first control end outputs a first level signal, and the first input end and the output end of the selection module are connected; the audio detection module detects that the audio volume emitted by the electronic device is less than the volume threshold, the first control end outputs a second level signal, and the second input end and the output end of the power supply module are connected; wherein the first supply voltage output by the first power supply end is greater than the second supply voltage output by the second power supply end.

[0012] In some embodiments, the gating module includes a first switch unit, a second switch unit, a third switch unit and a fourth switch unit, and the third switch unit and the fourth switch unit are connected in parallel to form a current mirror;

[0013] The input end of the first switch unit is electrically connected to the first power supply end, the output end of the first switch unit is electrically connected to the playback module, the control end of the first switch unit is electrically connected to the first control end, and the control end of the first switch unit is the control end of the gating module;

[0014] The input end of the second switch unit is electrically connected to the second power supply end, the output end of the second switch unit is electrically connected to the playback module, and the control end of the second switch unit is electrically connected to the first power supply end;

[0015] The input ends of the third switch unit and the fourth switch unit are both electrically connected to the first power supply end, the control ends of the third switch unit and the fourth switch unit are both electrically connected to the first power supply end, the output end of the third switch unit is connected in series between the second power supply end and the second switch unit, and the output end of the fourth switch unit is connected in series between the second switch unit and the playback module;

[0016] The first control end outputs the first level signal, the first switch unit and the third switch unit are turned on, and the second switch unit and the fourth switch unit are turned off; the first control end outputs the second level signal, the first switch unit and the third switch unit are turned off, and the second switch unit and the fourth switch unit are turned on.

[0017] In some embodiments, the first switch unit includes a first field effect transistor, a second field effect transistor, a first resistor, and a second resistor;

[0018] The gate of the first field effect transistor is connected in series between the first resistor and the second resistor, the source of the first field effect transistor is electrically connected to the first power supply terminal and the first resistor respectively, and the drain of the first field effect transistor is electrically connected to the playback module;

[0019] The gate of the second field effect transistor is electrically connected to the first control terminal, and the gate of the second field effect transistor is the control terminal of the first switch unit, the source of the second field effect transistor is grounded, and the drain of the second field effect transistor is electrically connected to the second resistor.

[0020] In some embodiments, the second switch unit includes a third field effect transistor;

[0021] The source of the third field effect transistor is electrically connected to the second power supply end, the drain of the third field effect transistor is electrically connected to the playback module, the gate of the third field effect transistor is electrically connected to the first power supply end, and the gate of the third field effect transistor is the control end of the second switch unit.

[0022] In some embodiments, the third switch unit includes a first triode, and the fourth switch unit includes a second triode;

[0023] The collector and base of the first transistor are both electrically connected to the first power supply end, the emitter of the first transistor is connected in series between the second switch unit and the second power supply end, and the collector of the first transistor is the control end of the third switch unit;

[0024] The collector and base of the second transistor are electrically connected to the first power supply end respectively, the emitter of the second transistor is connected in series between the second switch unit and the playback module, and the collector of the second transistor is the control end of the fourth switch unit.

[0025] In some embodiments, the gating module further includes a first diode and a second diode;

[0026] A first end of the first diode is electrically connected to an output end of the third switch unit, and a second end of the first diode is connected in series between the second power supply end and the second switch unit;

[0027] A first end of the second diode is electrically connected to an output end of the fourth switch unit, and a second end of the second diode is connected in series between the second switch unit and the playback module.

[0028] In some embodiments, the gating module further includes an overcurrent protection unit, and the control module includes a second control terminal;

[0029] The control end of the overcurrent protection unit is electrically connected to the second control end, the input end of the overcurrent protection unit is electrically connected to the second power supply end, and the output end of the overcurrent protection unit is electrically connected to the first diode and the second switch unit respectively;

[0030] The second control end outputs a first level signal, and the input end and the output end of the overcurrent protection unit are connected; the second control end outputs a second level signal, and the input end and the output end of the overcurrent protection unit are disconnected.

[0031] In some embodiments, the overcurrent protection unit includes a voltage detection terminal;

[0032] The voltage detection end is electrically connected to the control module. When the voltage detection end detects that the output voltage of the overcurrent protection unit is greater than the input voltage, the second control end outputs a second level signal.

[0033] In some embodiments, the gating module further includes a fifth switch unit;

[0034] The control end of the fifth switch unit is electrically connected to the second control end, the input end of the fifth switch unit is electrically connected to the first power supply end, and the output end of the fifth switch unit is electrically connected to the input ends of the second switch unit and the third switch unit respectively.

[0035] In some embodiments, the fifth switch unit includes a fourth field effect transistor, a fifth field effect transistor, a third resistor and a fourth resistor;

[0036] The gate of the fourth field effect transistor is electrically connected to the third resistor and the fourth resistor respectively, the source of the fourth field effect transistor is electrically connected to the first power supply end, and the drain of the fourth field effect transistor is electrically connected to the input end of the second switch unit and the third switch unit respectively;

[0037] The gate of the fifth field effect transistor is electrically connected to the second control terminal, the gate of the fifth field effect transistor is the control terminal of the fifth switch unit, the drain of the fifth field effect transistor is electrically connected to the fourth resistor, and the source of the fifth field effect transistor is grounded.

[0038] The control circuit of the electronic device provided in the embodiment of the present application includes a power supply circuit, a control module and an audio detection module; the control module is electrically connected to the power supply circuit and the audio detection module respectively, and the power supply circuit is electrically connected to the playback module; the audio detection module detects that the audio volume emitted by the electronic device is greater than or equal to the volume threshold, and the control module controls the power supply circuit to provide a first power supply voltage to the playback module; the audio detection module detects that the audio volume emitted by the electronic device is less than the volume threshold, and the control module controls the power supply circuit to provide a second power supply voltage to the playback module; wherein the first power supply voltage is greater than the second power supply voltage. Thus, the control circuit of the electronic device provided in the embodiment of the present application can use a high voltage to power the playback module when the system volume is high, and can use a low voltage to power the playback module when the system volume is low, thereby improving the prior art that the electronic device playback module is provided with a constant voltage when the volume of the sound played by the electronic device is small and the volume is large, and when the sound is played at a small volume, the static power consumption is as large as when the sound is played at a large volume, thereby causing the problem of low efficiency of the sound playback circuit and increased power consumption. Thus, the control circuit of the electronic device provided by the embodiment of the present application is conducive to improving the efficiency of the sound playback circuit and reducing power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0041] Figure 1 A schematic diagram of the structure of a control circuit of an electronic device provided in an embodiment of the present application;

[0042] Figure 2 A schematic diagram of the structure of a control circuit of another electronic device provided in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of the structure of a control circuit of another electronic device provided in an embodiment of the present application;

[0044] Figure 4 A schematic diagram of the structure of a control circuit of another electronic device provided in an embodiment of the present application;

[0045] Figure 5 A schematic diagram of the structure of a control circuit of another electronic device provided in an embodiment of the present application;

[0046] Figure 6 A schematic diagram of the structure of a control circuit of another electronic device provided in an embodiment of the present application.

[0047] Among them, 10, the control circuit of the electronic device; 010, the power supply circuit; 11, the gating module; 12, the control module; 13, the power module; 14, the audio detection module; 15, the playing module; 16, the first switch unit; 17, the second switch unit; 18, the third switch unit; 19, the fourth switch unit; 20, the overcurrent protection unit; 21, the fifth switch unit; A, the first control end of the control module; A8, the second control end of the control module; A0, the control end of the gating module; A1, the first power supply end of the power module; A2, the second power supply end of the power module; A3, the output end of the gating module; A01, the first input end of the gating module; A02, the second input end of the gating module; A4, the control end of the overcurrent protection unit; A5, the input end of the overcurrent protection unit; A6, the output end of the overcurrent protection unit; A7, the voltage detection end; F1, the input end of the first switch unit; F2, the output end of the first switch unit; F, the control end of the first switch unit; F3, input end of the second switch unit; F4, output end of the second switch unit; F0, control end of the second switch unit; H1, input end of the third switch unit; H2, output end of the third switch unit; H, control end of the third switch unit; H0, control end of the fourth switch unit; H3, input end of the fourth switch unit; H4, output end of the fourth switch unit; M1, first field effect transistor; M2, second field effect transistor; M3, third field effect transistor; M4, fourth field effect transistor; M5, fifth field effect transistor; G, gate; S, source; D, drain; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; Q1, first triode; Q2, second triode; B, collector; E, emitter; C, base; D1, first diode; D2, second diode; B0, control end of the fifth switch unit; B1, input end of the fifth switch unit; B2, output end of the fifth switch unit. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0049] The control circuit of the electronic device provided in the embodiment of the present application can use a high voltage to power the playback module when the system volume is high, and can use a low voltage to power the playback module when the system volume is low, thereby improving the problem in the prior art that a constant voltage is provided to the playback module of the electronic device when the volume of the sound played by the electronic device is low and when the volume is high. When the sound is played at a low volume, the static power consumption is the same as when the sound is played at a high volume, resulting in low efficiency of the sound playback circuit and increased power consumption. Therefore, the control circuit of the electronic device provided in the embodiment of the present application is conducive to improving the efficiency of the sound playback circuit and reducing power consumption, thereby improving the user experience.

[0050] The control circuit of the electronic device provided in the embodiments of the present application is exemplarily described below with reference to the accompanying drawings.

[0051] Figure 1 This is a schematic diagram of the structure of a control circuit of an electronic device provided in an embodiment of the present application. Figure 1 As shown, the control circuit 10 of the electronic device includes: a power supply circuit 010, a control module 12 and an audio detection module 14; the control module 12 is electrically connected to the power supply circuit 010 and the audio detection module 14 respectively, and the power supply circuit 010 is electrically connected to the playback module 15; the audio detection module 14 detects that the audio volume emitted by the electronic device is greater than or equal to the volume threshold, and the control module 12 controls the power supply circuit 010 to provide a first power supply voltage to the playback module 15; the audio detection module 14 detects that the audio volume emitted by the electronic device is less than the volume threshold, and the control module 12 controls the power supply circuit 010 to provide a second power supply voltage to the playback module 15. The first power supply voltage is greater than the second power supply voltage.

[0052] The power supply circuit 010 includes a gating module 11 and a power module 13; a control terminal A0 of the gating module 11 is electrically connected to a first control terminal A of the control module 12, a first input terminal A01 of the gating module 11 is electrically connected to a first power supply terminal A1 of the power module 13, a second input terminal A02 of the gating module 11 is electrically connected to a second power supply terminal A2 of the power module 13, and an output terminal A3 of the gating module 11 is electrically connected to the playing module 15;

[0053] The control module 12 is electrically connected to the audio detection module 14. When the audio detection module 14 detects that the audio volume emitted by the electronic device is greater than or equal to the volume threshold, the first control terminal A outputs a first level signal, and the first input terminal A01 of the selection module 11 is connected to the output terminal A3. When the audio detection module 14 detects that the audio volume emitted by the electronic device is less than the volume threshold, the first control terminal A outputs a second level signal, and the second input terminal A02 of the power supply module 13 is connected to the output terminal A3. The first supply voltage output by the first power supply terminal A1 is greater than the second supply voltage output by the second power supply terminal A2.

[0054] Specifically, the audio detection module 14 may transmit the detected audio volume emitted by the electronic device to the control module 12 , and the control module 12 controls the gating state of the gating module 11 according to the audio volume emitted by the electronic device.

[0055] Wherein, the volume threshold value can be set to 50% of the maximum volume emitted by the electronic device. When the audio volume emitted by the electronic device of the audio detection module 14 is greater than or equal to the volume threshold value, the first control terminal A of the control module 12 outputs a first level signal, which can be a high level signal, to the control terminal A0 of the gating module 11. At this time, the first input terminal A01 of the gating module 11 is connected to the output terminal A3, thereby connecting the first power supply terminal A1 of the power module 13 to the power supply circuit of the playing module 15, thereby realizing the second power supply terminal A2 to supply power to the playing module 15. When the audio volume emitted by the electronic device of the audio detection module 14 is less than the volume threshold value, the first control terminal A of the control module 12 outputs a second level signal, which can be a low level signal, to the control terminal A0 of the gating module 11. At this time, the second input terminal A02 of the gating module 11 is connected to the output terminal A3, thereby connecting the second power supply terminal A2 of the power module 13 to the power supply circuit of the playing module 15, thereby realizing the second power supply terminal A2 to supply power to the playing module 15.

[0056] The power supply voltage of the first power supply terminal A1 is greater than the power supply voltage of the second power supply terminal A2. Exemplarily, the power supply voltage of the first power supply terminal A1 is 15V, and the power supply voltage of the second power supply terminal A2 is 5V. Thus, when the audio volume emitted by the electronic device is greater than or equal to the volume threshold, that is, when the electronic device emits a high volume, a high voltage can be provided to the playback module 15; when the audio volume emitted by the electronic device is less than the volume threshold, that is, when the electronic device emits a low volume, a low voltage can be provided to the playback module 15.

[0057] Therefore, the control circuit of the electronic device provided in the embodiment of the present application can use a high voltage to power the playback module when the system volume is high, and can use a low voltage to power the playback module when the system volume is low, thereby improving the problem in the prior art that a constant voltage is provided to the playback module of the electronic device when the volume of the sound played by the electronic device is low and when the volume is high. When the sound is played at a low volume, the static power consumption is the same as when the sound is played at a high volume, resulting in low efficiency of the sound playback circuit and increased power consumption. Therefore, the control circuit of the electronic device provided in the embodiment of the present application is conducive to improving the efficiency of the sound playback circuit and reducing power consumption, thereby improving the user experience.

[0058] In some embodiments, Figure 2 A schematic diagram of the structure of a control circuit of another electronic device provided in an embodiment of the present application. Figure 1 and Figure 2, the gating module 11 includes a first switch unit 16, a second switch unit 17, a third switch unit 18 and a fourth switch unit 19, and the third switch unit 18 and the fourth switch unit 19 are connected in parallel to form a current mirror;

[0059] The input terminal F1 of the first switch unit 16 is electrically connected to the first power supply terminal A1, the output terminal F2 of the first switch unit 16 is electrically connected to the playback module 15, the control terminal F of the first switch unit 16 is electrically connected to the first control terminal A, and the control terminal F of the first switch unit 16 is the control terminal A0 of the selection module 11;

[0060] The input terminal F3 of the second switch unit 17 is electrically connected to the second power supply terminal A2, the output terminal F4 of the second switch unit 17 is electrically connected to the playback module 15, and the control terminal F0 of the second switch unit 17 is electrically connected to the first power supply terminal A1;

[0061] The input terminal H1 of the third switch unit 18 and the input terminal H2 of the fourth switch unit 19 are both electrically connected to the first power supply terminal A1, the control terminal H of the third switch unit 18 and the control terminal H0 of the fourth switch unit 19 are both electrically connected to the first power supply terminal A1, the output terminal H2 of the third switch unit 18 is connected in series between the second power supply terminal A2 and the second switch unit 17, and the output terminal H4 of the fourth switch unit 19 is connected in series between the second switch unit 17 and the playback module 15;

[0062] The first control terminal A outputs a first level signal, the first switch unit 16 and the third switch unit 18 are turned on, and the second switch unit 17 and the fourth switch unit 19 are turned off; the first control terminal A outputs a second level signal, the first switch unit 16 and the third switch unit 18 are turned off, and the second switch unit 17 and the fourth switch unit 19 are turned on.

[0063] The input terminal F1 of the first switch unit 16 is electrically connected to the first power supply terminal A1, and the output terminal F2 of the first switch unit 16 is electrically connected to the playback module 15. Therefore, when the input terminal F1 and the output terminal F2 of the first switch unit 16 are controlled to be turned on, the first power supply terminal A1, for example, a 15V power supply voltage, can be used to supply power to the playback module 15.

[0064] The input terminal F3 of the second switch unit 17 is electrically connected to the second power supply terminal A2, and the output terminal F4 of the second switch unit 17 is electrically connected to the playback module 15. Therefore, when the input terminal F3 and the output terminal F4 of the second switch unit 17 are controlled to be turned on, the second power supply terminal A2, for example, a 5V power supply voltage, can be used to supply power to the playback module 15.

[0065] Specifically, the first control terminal A of the control module 12 can output a first level signal to control the input terminal F1 and the output terminal F2 of the first switch unit 16 to be turned on, so that the first power supply terminal A1, for example, a 15V power supply voltage can supply power to the playback module 15; or, the first control terminal A of the control module 12 can output a second level signal to control the first switch unit 16 to be turned off, and the first switch unit 16 is in the off state to control the input terminal F3 and the output terminal F4 of the second switch unit 17 to be turned on, so that the second power supply terminal A2, for example, a 5V power supply voltage can supply power to the playback module 15.

[0066] For example, Figure 3 A schematic diagram of the structure of another electronic device provided in an embodiment of the present application. Figure 2 and Figure 3 The first switch unit 16 includes a first field effect transistor M1, a second field effect transistor M2, a first resistor R1 and a second resistor R2; a gate G of the first field effect transistor M1 is connected in series between the first resistor R1 and the second resistor R2, a source S of the first field effect transistor M1 is electrically connected to the first power supply terminal A1 and the first resistor R1 respectively, and a drain D of the first field effect transistor M1 is electrically connected to the playback module 15; a gate G of the second field effect transistor M2 is electrically connected to the first control terminal A, and the gate G of the second field effect transistor M2 is the control terminal F of the first switch unit 16, a source S of the second field effect transistor M2 is grounded, and a drain D of the second field effect transistor M2 is electrically connected to the second resistor R2.

[0067] Continue to refer to Figure 2 and Figure 3 , the second switch unit 17 includes a third field effect transistor M3; a source S of the third field effect transistor M3 is electrically connected to the second power supply terminal A2, a drain D of the third field effect transistor M3 is electrically connected to the playback module 15, a gate G of the third field effect transistor M3 is electrically connected to the first power supply terminal A1, and the gate G of the third field effect transistor M3 is the control terminal F0 of the second switch unit 17;

[0068] Continue to refer to Figure 2 and Figure 3 The third switch unit 18 includes a first transistor Q1, and the fourth switch unit 19 includes a second transistor Q2; the collector B and the base C of the first transistor Q1 are both electrically connected to the first power supply terminal A1, the emitter E of the first transistor Q1 is connected in series between the second switch unit 17 and the second power supply terminal A2, and the collector B of the first transistor Q1 is the control terminal H of the third switch unit 18; the collector B and the base C of the second transistor Q2 are electrically connected to the first power supply terminal A1 respectively, the emitter E of the second transistor Q2 is connected in series between the second switch unit 17 and the playback module 15, and the collector B of the second transistor Q2 is the control terminal H0 of the fourth switch unit 19.

[0069] Specifically, when the audio volume emitted by the electronic device of the audio detection module 14 is greater than or equal to the volume threshold, the first control terminal A of the control module 12 outputs a first level signal to the gate G of the second field effect transistor M2, which may be a high level signal. At this time, the voltage difference formed between the gate G and the source S of the second field effect transistor M2 can cause the second field effect transistor M2 to turn on.

[0070] When the second field effect transistor M2 is turned on, the first power supply terminal A1 is grounded through the first resistor R1 and the second resistor R2. At this time, the gate G of the second field effect transistor M2 is connected in series between the first resistor R1 and the second resistor R2, and the source S of the second field effect transistor M2 is electrically connected to the first power supply terminal A1. The voltage difference formed between the gate G and the source S of the second field effect transistor M2 can turn on the first field effect transistor M1, so that the first power supply terminal A1 supplies power to the playback module 15 through the first switch unit 16.

[0071] When the first power supply terminal A1 supplies power to the playback module 15 through the first switch unit 16, the collector B of the second triode Q2 is electrically connected to the first power supply terminal A1, and the emitter E of the second triode Q2 is electrically connected to the playback module 15. At this time, the voltages of the collector B and the emitter E of the second triode Q2 are equal, so the second triode Q2 is in the disconnected state. When the second triode Q2 is in the disconnected state, the first triode Q1 is in the on state. When the first triode Q1 is in the on state, the gate G of the third field effect transistor M3 and the source S have the same voltage, and the third field effect transistor M3 is in the disconnected state.

[0072] Therefore, when the control module 12 outputs the first level signal, the first switch unit 16 and the third switch unit 18 are in the on state, and the second switch unit 17 and the fourth switch unit 19 are in the off state, so that the first power supply terminal A1 can supply power to the playback module 15.

[0073] Specifically, the first control terminal A of the control module 12 outputs a second level signal to the gate G of the second field effect transistor M2, which may be a low level signal, and at this time, the second field effect transistor M2 cannot be turned on, that is, the second field effect transistor M2 is in an off state. When the second field effect transistor M2 is in an off state, the gate G and the source S of the first field effect transistor M1 are electrically connected to the first power supply terminal A1, so the first field effect transistor M1 cannot be turned on, that is, the first field effect transistor M1 is in an off state, and at this time, the first power supply terminal A1 cannot supply power to the playback module 15.

[0074] At this time, the collector B of the second triode Q2 is electrically connected to the first power supply terminal A1, and the emitter E of the second triode Q2 is electrically connected to the playback module; while the collector B of the first triode Q1 is electrically connected to the first power supply terminal A1, and the emitter E of the first triode Q1 is electrically connected to the second power supply terminal A2. Since the playback module 15 is not powered, the differential voltage between the collector B and the emitter E of the second triode Q2 is greater than the differential voltage between the collector B and the emitter E of the second triode Q2, and the second triode Q2 is preferentially in a closed state. When the second triode Q2 is in a closed state, the first triode Q1 is in an open state.

[0075] In addition, the gate G of the third field effect transistor M3 is electrically connected to the first power supply terminal A1, and the source S of the third field effect transistor M3 is electrically connected to the second power supply terminal A2. The voltage difference between the gate G and the source S of the third field effect transistor M3 can make the third field effect transistor M3 turned on, so that the second power supply terminal A2 can supply power to the playback module 15.

[0076] Therefore, when the control module 12 outputs the second level signal, the first switch unit 16 and the third switch unit 18 are in the disconnected state, and the second switch unit 17 and the fourth switch unit 19 are in the on state, so that the second power supply terminal A2 can supply power to the playback module 15.

[0077] It should be noted that when the audio detection module 14 detects that the audio volume emitted by the electronic device switches from being greater than or equal to the volume threshold to being less than the volume threshold, it needs to go through a process of switching from high voltage to low voltage, that is, switching from the first power supply terminal A1 to the second power supply terminal A2. When switching from the first power supply terminal A1 to the second power supply terminal A2, the first field effect transistor M1 switches from the on state to the off state, and at this time, the playback module 15 is in the process of voltage reduction. When the voltage of the playback module 15 is lower than, for example, 5V, the voltage difference between the emitter E and the collector B of the second transistor Q2 can make the second transistor Q2 conduct. When the second transistor Q2 is conducted, the first transistor Q1 switches from the on state when it is in high voltage power supply to the off state. When the first transistor Q1 is disconnected, the gate G of the third field effect transistor M3 is electrically connected to the first power supply terminal A1, and the source S of the third field effect transistor M3 is electrically connected to the second power supply terminal A2. At this time, the voltage difference between the gate G and the source S of the third field effect transistor M3 can turn on the third field effect transistor M3, so that the second power supply terminal A2 supplies power to the playback module 15 through the third field effect transistor M3.

[0078] However, in the process of switching from the first power supply terminal A1 to the second power supply terminal A2, the voltage of the playback module 15 will not drop from a high voltage to a very low voltage immediately, and needs to go through a voltage drop process. For example, the voltage of the playback module 15 drops from 15V to 8V. If the third field effect transistor M3 is turned on, the second power supply terminal A2 provides a voltage of, for example, 5V to power the playback module 15. The voltage of the playback module 15 is 8V, and current backflow to the second power supply terminal A2 is likely to occur.

[0079] However, the embodiment of the present application sets the first transistor Q1 and the second transistor Q2 in parallel. For example, when the voltage of the playback module 15 drops from 15V to 8V, the second transistor Q2 is not turned on immediately. When the voltage of the playback module 15 drops from 15V to less than 5V, the second transistor Q2 is turned on. When the second transistor Q2 is turned on, the first transistor Q1 is turned off. When the first transistor Q1 is turned off, the third field effect transistor M3 is turned on, which can avoid the phenomenon of current backflow in the process of switching from high voltage to low voltage. Among them, the first transistor Q1 and the second transistor Q2 are set in parallel to form a current mirror. When the first transistor Q1 is turned on, the second transistor Q2 is turned off. When the first transistor Q1 is turned on, the second transistor Q2 is turned off. This is the working principle of the current mirror. The specific working principle of the current mirror is a well-known technology for those skilled in the art and will not be repeated here.

[0080] Therefore, by setting the third switch unit 18 to include the first transistor Q1 and the fourth switch unit 19 to include the second transistor Q2, current backflow can be avoided while switching between the first power supply terminal A1 and the second power supply terminal A2 to supply power to the playback module.

[0081] In some embodiments, Figure 4 This is a schematic diagram of the structure of a control circuit of another electronic device provided in an embodiment of the present application. Figure 4 As shown, the selection module 11 also includes a first diode D1 and a second diode D2; the first end of the first diode D1 is electrically connected to the output end H2 of the third switch unit 18, and the second end of the first diode D1 is connected in series between the second power supply end A2 and the second switch unit 17; the first end of the second diode is electrically connected to the output end H4 of the fourth switch unit 19, and the second end of the second diode D2 is connected in series between the second switch unit 17 and the playback module 15.

[0082] The first diode D1 and the second diode D2 are unidirectional conducting diodes, so that the voltage can be stabilized and the reverse blocking function can be achieved by setting the unidirectional conducting diodes.

[0083] In some embodiments, Figure 5 This is a schematic diagram of the structure of a control circuit of another electronic device provided in an embodiment of the present application. Figure 5As shown, the gating module 11 further includes an overcurrent protection unit 20, and the control module 12 includes a second control terminal A8;

[0084] The control terminal A4 of the overcurrent protection unit 20 is electrically connected to the second control terminal A8, the input terminal A5 of the overcurrent protection unit 20 is electrically connected to the second power supply terminal A2, and the output terminal A6 of the overcurrent protection unit 20 is electrically connected to the first diode D1 and the second switch unit 17 respectively;

[0085] The second control terminal A8 outputs a first level signal, which may be a high level signal, for example, and the input terminal A5 and the output terminal A6 of the overcurrent protection unit 20 are connected; the second control terminal A8 outputs a second level signal, which may be a low level signal, for example, and the input terminal A5 and the output terminal A6 of the overcurrent protection unit 20 are disconnected.

[0086] Specifically, when the functions of the third switch unit 18 and the fourth switch unit 19 fail, the current backflow phenomenon mentioned above may occur. In order to prevent the current backflow due to the failure of the third switch unit 18 and the fourth switch unit 19 or due to other reasons, an overcurrent protection unit 20 is provided to control the disconnection between the input terminal A5 and the output terminal A6 of the overcurrent protection unit 20 to avoid the current backflow.

[0087] Specifically, the overcurrent protection unit 20 includes a voltage detection terminal A7, which is electrically connected to the control module 12. When the voltage detection terminal A7 detects that the voltage of the output terminal A6 of the overcurrent protection unit 20 is greater than the voltage of the input terminal A5, the second control terminal A8 outputs a second level signal, such as a low level signal, to control the disconnection between the input terminal A5 and the output terminal A6 of the overcurrent protection unit 20, thereby preventing the current from flowing back.

[0088] In addition, when the second control terminal outputs a first level signal, such as a high level signal, the input terminal A5 and the output terminal A6 of the overcurrent protection unit 20 can be controlled to be closed, so that the second power supply terminal A2 supplies power to the playback module 15 .

[0089] In some embodiments, continue to refer to Figure 5 The gating module 11 also includes a fifth switch unit 21; the control terminal B0 of the fifth switch unit 21 is electrically connected to the second control terminal A8, the input terminal B1 of the fifth switch unit 21 is electrically connected to the first power supply terminal A1, and the output terminal B2 of the fifth switch unit 21 is electrically connected to the input terminals of the second switch unit 17 and the third switch unit 18 respectively.

[0090] Specifically, when the electronic device is not playing audio, the first transistor Q1 and the second transistor Q2 of the third switch unit 18 can be turned on when in a critical state, thereby causing the second power supply end A2 to leak to the first transistor Q1 of the second switch unit 17 and the second transistor Q2 of the third switch unit 18.

[0091] Based on this, a control signal is outputted to the control end of the fifth switch unit 21 through the second control end A8 of the control module 12 to control the disconnection between the input end B1 and the output end B2 of the fifth switch unit 21, thereby disconnecting the circuit between the second power supply end A2 and the second switch unit 17 and the third switch unit 18, thereby preventing the second power supply end A2 from leaking to the first transistor Q1 of the second switch unit 17 and the second transistor Q2 of the third switch unit 18.

[0092] For example, Figure 6 A schematic diagram of a control circuit of another electronic device provided in an embodiment of the present application. Figure 3 , Figure 5 and 6 The fifth switch unit 21 includes a fourth field effect transistor M4, a fifth field effect transistor M5, a third resistor R3 and a fourth resistor R4; a gate G of the fourth field effect transistor M4 is electrically connected to the third resistor R3 and the fourth resistor R4 respectively, a source S of the fourth field effect transistor M4 is electrically connected to the first power supply terminal A1, and a drain D of the fourth field effect transistor M4 is electrically connected to the input terminals of the second switch unit 17 and the third switch unit 18 respectively; a gate G of the fifth field effect transistor M5 is electrically connected to the second control terminal A8, a gate G of the fifth field effect transistor M5 is the control terminal B0 of the fifth switch unit 21, a drain D of the fifth field effect transistor M5 is electrically connected to the fourth resistor R4, and a source S of the fifth field effect transistor M5 is grounded.

[0093] Specifically, when the electronic device does not play audio, the first control terminal of the control module 12 outputs a second level signal, such as a low level signal, to the gate G of the fifth field effect transistor M5, and the fifth field effect transistor M5 cannot be turned on, that is, the fifth field effect transistor M5 is in an off state. When the fifth field effect transistor M5 is in an off state, the gate G and the source S of the fourth field effect transistor M4 are both electrically connected to the first power supply terminal A1, so the fourth field effect transistor M4 cannot be turned on, that is, the fourth field effect transistor M4 is in an off state, and the first power supply terminal A1 cannot leak electricity to the first transistor Q1 of the second switch unit 17 and the second transistor Q2 of the third switch unit 18.

[0094] Continue to refer to Figure 6When the audio volume emitted by the electronic device of the audio detection module 14 is greater than or equal to the volume threshold, the first control terminal A of the control module 12 outputs a first level signal, which may be a high level signal, to the gate G of the second field effect transistor M2; in addition, the second control terminal A8 of the control module 12 outputs a first level signal, which may be a high level signal, to the control terminal A4 of the overcurrent protection unit and the gate G of the second field effect transistor M2. At this time, the first switch unit 16, the third switch unit 18 and the fifth switch unit 21 are turned on, and the second switch unit 17 and the fourth switch unit 19 are turned off, so that the first power supply terminal A1 supplies power to the playback module 15.

[0095] When the audio volume emitted by the electronic device of the audio detection module 14 is less than the volume threshold, the first control end of the control module 12 outputs a second level signal, which may be a low level signal, to the control end of the selection module 11; in addition, the second control end A8 of the control module 12 outputs a first level signal, which may be a high level signal, to the control end A4 of the overcurrent protection unit and the gate G of the second field effect transistor M2. At this time, the first switch unit 16, the third switch unit 18 and the fifth switch unit 21 are disconnected, and the second switch unit 17 and the fourth switch unit 19 are turned on, so that the second power supply end A2 supplies power to the playback module 15.

[0096] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A control circuit of an electronic device, characterized in that: include: A power supply circuit, a control module and an audio detection module; the control module is electrically connected to the power supply circuit and the audio detection module respectively, and the power supply circuit is electrically connected to the playback module; When the audio detection module detects that the audio volume emitted by the electronic device is greater than or equal to the volume threshold, the control module controls the power supply circuit to provide the first power supply voltage to the playback module; when the audio detection module detects that the audio volume emitted by the electronic device is less than the volume threshold, the control module controls the power supply circuit to provide the second power supply voltage to the playback module; Wherein, the first supply voltage is greater than the second supply voltage.

2. The control circuit of the electronic device according to claim 1, characterized in that: The power supply circuit includes a gating module and a power supply module; The control end of the gating module is electrically connected to the first control end of the control module, the first input end of the gating module is electrically connected to the first power supply end of the power module, the second input end of the gating module is electrically connected to the second power supply end of the power module, and the output end of the gating module is electrically connected to the playing module; The audio detection module detects that the audio volume emitted by the electronic device is greater than or equal to the volume threshold, the first control end outputs a first level signal, and the first input end and the output end of the selection module are connected; the audio detection module detects that the audio volume emitted by the electronic device is less than the volume threshold, the first control end outputs a second level signal, and the second input end and the output end of the power supply module are connected; wherein the first supply voltage output by the first power supply end is greater than the second supply voltage output by the second power supply end.

3. The control circuit of the electronic device according to claim 2, characterized in that: The gating module comprises a first switch unit, a second switch unit, a third switch unit and a fourth switch unit, wherein the third switch unit and the fourth switch unit are connected in parallel to form a current mirror; The input end of the first switch unit is electrically connected to the first power supply end, the output end of the first switch unit is electrically connected to the playback module, the control end of the first switch unit is electrically connected to the first control end, and the control end of the first switch unit is the control end of the gating module; The input end of the second switch unit is electrically connected to the second power supply end, the output end of the second switch unit is electrically connected to the playback module, and the control end of the second switch unit is electrically connected to the first power supply end; The input ends of the third switch unit and the fourth switch unit are both electrically connected to the first power supply end, the control ends of the third switch unit and the fourth switch unit are both electrically connected to the first power supply end, the output end of the third switch unit is connected in series between the second power supply end and the second switch unit, and the output end of the fourth switch unit is connected in series between the second switch unit and the playback module; The first control end outputs the first level signal, the first switch unit and the third switch unit are turned on, and the second switch unit and the fourth switch unit are turned off; The first control end outputs the second level signal, the first switch unit and the third switch unit are disconnected, and the second switch unit and the fourth switch unit are turned on.

4. The control circuit of the electronic device according to claim 3, characterized in that: The first switch unit includes a first field effect transistor, a second field effect transistor, a first resistor and a second resistor; The gate of the first field effect transistor is connected in series between the first resistor and the second resistor, the source of the first field effect transistor is electrically connected to the first power supply terminal and the first resistor respectively, and the drain of the first field effect transistor is electrically connected to the playback module; The gate of the second field effect transistor is electrically connected to the first control terminal, and the gate of the second field effect transistor is the control terminal of the first switch unit, the source of the second field effect transistor is grounded, and the drain of the second field effect transistor is electrically connected to the second resistor.

5. The control circuit of the electronic device according to claim 3, characterized in that: The second switch unit includes a third field effect transistor; The source of the third field effect transistor is electrically connected to the second power supply end, the drain of the third field effect transistor is electrically connected to the playback module, the gate of the third field effect transistor is electrically connected to the first power supply end, and the gate of the third field effect transistor is the control end of the second switch unit.

6. The control circuit of the electronic device according to claim 3, characterized in that: The third switch unit includes a first triode, and the fourth switch unit includes a second triode; The collector and base of the first transistor are both electrically connected to the first power supply end, the emitter of the first transistor is connected in series between the second switch unit and the second power supply end, and the collector of the first transistor is the control end of the third switch unit; The collector and base of the second transistor are electrically connected to the first power supply end respectively, the emitter of the second transistor is connected in series between the second switch unit and the playback module, and the collector of the second transistor is the control end of the fourth switch unit.

7. The control circuit of the electronic device according to claim 6, characterized in that: The gating module also includes a first diode and a second diode; The first end of the first diode is electrically connected to the output end of the third switch unit, and the second end of the first diode is connected in series between the second power supply end and the second switch unit; A first end of the second diode is electrically connected to an output end of the fourth switch unit, and a second end of the second diode is connected in series between the second switch unit and the playback module.

8. The control circuit of the electronic device according to claim 7, characterized in that: The gating module further includes an overcurrent protection unit, and the control module includes a second control terminal; The control end of the overcurrent protection unit is electrically connected to the second control end, the input end of the overcurrent protection unit is electrically connected to the second power supply end, and the output end of the overcurrent protection unit is electrically connected to the first diode and the second switch unit respectively; The second control terminal outputs a first level signal, and the input terminal and the output terminal of the overcurrent protection unit are connected; The second control terminal outputs a second level signal, and the input terminal and the output terminal of the overcurrent protection unit are disconnected.

9. The control circuit of the electronic device according to claim 8, characterized in that: The overcurrent protection unit includes a voltage detection terminal; The voltage detection end is electrically connected to the control module. When the voltage detection end detects that the output voltage of the overcurrent protection unit is greater than the input voltage, the second control end outputs a second level signal.

10. The control circuit of the electronic device according to claim 8, characterized in that: The gating module further includes a fifth switch unit; The control end of the fifth switch unit is electrically connected to the second control end, the input end of the fifth switch unit is electrically connected to the first power supply end, and the output end of the fifth switch unit is electrically connected to the input ends of the second switch unit and the third switch unit respectively; The fifth switch unit includes a fourth field effect transistor, a fifth field effect transistor, a third resistor and a fourth resistor; The gate of the fourth field effect transistor is electrically connected to the third resistor and the fourth resistor respectively, the source of the fourth field effect transistor is electrically connected to the first power supply end, and the drain of the fourth field effect transistor is electrically connected to the input end of the second switch unit and the third switch unit respectively; The gate of the fifth field effect transistor is electrically connected to the second control terminal, the gate of the fifth field effect transistor is the control terminal of the fifth switch unit, the drain of the fifth field effect transistor is electrically connected to the fourth resistor, and the source of the fifth field effect transistor is grounded.

Images