Power supply circuit and electronic device

Abstract

The present disclosure relates to a power supply circuit and an electronic device. The power supply circuit comprises: a first voltage conversion circuit, an input end of which is configured to receive a first input voltage, and the first voltage conversion circuit is configured to convert the first input voltage into a first output voltage; a second voltage conversion circuit, an input end of which is configured to receive a second input voltage, and the second voltage conversion circuit is configured to convert the second input voltage into a second output voltage; a first switch circuit, a first end of which is electrically connected to an output end of the first voltage conversion circuit, and a control end of the first switch circuit is configured to receive a control signal; a second switch circuit, a first control end and a first end of the second switch circuit are electrically connected to a second end of the first switch circuit, a second control end and a second end of the second switch circuit are electrically connected to an output end of the second voltage conversion circuit, and a third end of the second switch circuit is configured to be electrically connected to a power supply end of an audio power amplifier circuit, and the first switch circuit and the second switch circuit are configured to transmit the first output voltage or the second output voltage to the power supply end of the audio power amplifier circuit.

Description

Technical Field

[0001] This disclosure relates to the field of power supply technology, and in particular to a power supply circuit and electronic device. Background Technology

[0002] Currently, power supply circuits typically include two voltage conversion circuits with different output voltages. By selecting one of these voltage conversion circuits, a suitable supply voltage is provided to the power supply terminal of the audio power amplifier circuit. However, due to significant losses in the circuitry used to select the voltage conversion circuit, the power supply circuit suffers from high power loss. Utility Model Content

[0003] To overcome the problems existing in related technologies, this disclosure provides a power supply circuit and electronic device.

[0004] According to a first aspect of this disclosure, a power supply circuit is provided, the power supply circuit comprising:

[0005] A first voltage conversion circuit, wherein the input terminal of the first voltage conversion circuit is used to receive a first input voltage, and the first voltage conversion circuit is used to convert the first input voltage into a first output voltage;

[0006] The second voltage conversion circuit has an input terminal for receiving a second input voltage and is used to convert the second input voltage into a second output voltage.

[0007] A first switching circuit, wherein a first terminal of the first switching circuit is electrically connected to the output terminal of the first voltage conversion circuit, and a control terminal of the first switching circuit is used to receive control signals;

[0008] The second switching circuit has a first terminal and a first control terminal that are electrically connected to the second terminal of the first switching circuit. The second terminal and the second control terminal of the second switching circuit are electrically connected to the output terminal of the second voltage conversion circuit. The third terminal of the second switching circuit is used to be electrically connected to the power supply terminal of the audio power amplifier circuit.

[0009] The first switching circuit and the second switching circuit are used to transmit the first output voltage or the second output voltage to the power supply terminal of the audio power amplifier circuit.

[0010] In some embodiments of this disclosure, the first switching circuit includes:

[0011] A first switching unit, wherein a first terminal of the first switching unit is electrically connected to the output terminal of the first voltage conversion circuit, and a second terminal of the first switching unit is electrically connected to both the first terminal and the first control terminal of the second switching circuit; the control terminal of the first switching unit is used to receive the control signal; and / or

[0012] The second switching circuit includes:

[0013] The second switching unit has a first terminal electrically connected to the second terminal of the first switching circuit, a second terminal electrically connected to the power supply terminal of the audio power amplifier circuit, and a control terminal electrically connected to the output terminal of the second voltage conversion circuit.

[0014] The third switching unit has a first terminal for electrical connection to the power supply terminal of the audio power amplifier circuit, a second terminal for electrical connection to the output terminal of the second voltage conversion circuit, and a control terminal for electrical connection to the second terminal of the first switching circuit.

[0015] In some embodiments of this disclosure, the first switching unit includes:

[0016] A first transistor, wherein a first terminal of the first transistor is electrically connected to the output terminal of the first voltage conversion circuit, and a second terminal of the first transistor is electrically connected to both the first terminal and the first control terminal of the second switching circuit, and the control terminal of the first transistor is used to receive the control signal; and / or

[0017] The second switching unit includes:

[0018] The second transistor has a first terminal electrically connected to the second terminal of the first switching circuit, a second terminal electrically connected to the power supply terminal of the audio power amplifier circuit, and a control terminal electrically connected to the output terminal of the second voltage conversion circuit; and / or,

[0019] The third switching unit includes:

[0020] The third transistor has a first terminal that is electrically connected to the power supply terminal of the audio power amplifier circuit, a second terminal that is electrically connected to the output terminal of the second voltage conversion circuit, and a control terminal that is electrically connected to the second terminal of the first switching circuit.

[0021] In some embodiments of this disclosure, the first transistor is a P-type field-effect transistor; and / or, the second transistor is a P-type field-effect transistor; and / or, the third transistor is a P-type field-effect transistor.

[0022] In some embodiments of this disclosure, the first switching circuit further includes:

[0023] A pull-down unit, wherein the first end of the pull-down unit is electrically connected to the second end of the first switch unit, and the second end of the pull-down unit is used to be electrically connected to the ground terminal.

[0024] In some embodiments of this disclosure, the pull-down unit includes:

[0025] A resistor, the first end of which is electrically connected to the second end of the first switching unit, and the second end of which is used to be electrically connected to the grounding terminal.

[0026] In some embodiments of this disclosure, the input terminal of the first voltage conversion circuit is used to be electrically connected to the battery; the input terminal of the second voltage conversion circuit is used to be electrically connected to the battery via a step-down charge pump.

[0027] In some embodiments of this disclosure, both the first voltage conversion circuit and the second voltage conversion circuit are boost circuits.

[0028] In some embodiments of this disclosure, both the second voltage conversion circuit and the audio power amplifier circuit are disposed on the audio power amplifier chip.

[0029] According to a second aspect of this disclosure, an electronic device is provided, the charging device including the power supply circuit described above.

[0030] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0031] The power supply circuit includes a first voltage conversion circuit, a second voltage conversion circuit, a first switching circuit, and a second switching circuit. The first and second switching circuits are electrically connected between the first and second voltage conversion circuits and the audio power amplifier circuit, and are used to transmit either the first or second output voltage to the power supply terminal of the audio power amplifier circuit. Because the first and second switching circuits have low conduction losses, selecting the appropriate voltage conversion circuit to transmit the output voltage to the power supply terminal of the audio power amplifier circuit through the first and second switching circuits reduces the power supply circuit's losses. Furthermore, since the second switching circuit is controlled by the voltage at the second terminal of the first switching circuit and the second output voltage, no additional control circuit is needed to generate a control signal, further reducing the power supply circuit's losses and structural complexity.

[0032] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0034] Figure 1 This is a schematic diagram of the power supply circuit provided in an exemplary embodiment of the present disclosure;

[0035] Figure 2 This is a schematic diagram of the power supply circuit provided in another exemplary embodiment of the present disclosure;

[0036] Figure 3 This is a schematic diagram of the power supply circuit provided in another exemplary embodiment of the present disclosure;

[0037] Figure 4 This is a schematic diagram of the power supply circuit provided in another exemplary embodiment of the present disclosure;

[0038] Figure 5 This is a system block diagram of an electronic device provided in an exemplary embodiment of the present disclosure.

[0039] In the picture:

[0040] 10-First voltage conversion circuit; 11-First boost circuit; 20-Second voltage conversion circuit; 21-Second boost circuit; 30-First switching circuit; 31-First switching unit; 32-Pull-down unit; 40-Second switching circuit; 41-Second switching unit; 42-Third switching unit; 50-Audio power amplifier circuit; 60-Audio power amplifier chip; 70-Buck charge pump; 400-Electronic device; 402-Processing component; 404-Memory; 406-Power supply component; 408-Multimedia component; 410-Audio component; 412-Input / output interface; 414 - Sensor assembly; 416 - Communication assembly; 420 - Processor; T1 - First transistor; T2 - Second transistor; T3 - Third transistor; T4 - Fourth transistor; T5 - Fifth transistor; D1 - First diode; D2 - Second diode; D3 - Third diode; D4 - Fourth diode; D5 - Fifth diode; L1 - First inductor; L2 - Second inductor; C1 - First capacitor; C2 - Second capacitor; R - Resistor; Vin1 - First input voltage; Vin2 - Second input voltage; S - Control signal; GND - Ground; Bat - Battery. Detailed Implementation

[0041] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this invention as detailed in the appended claims. It should also be understood that the term “and / or” as used herein refers to any or all possible combinations including one or more of the associated listed items.

[0042] In electronic devices, audio power amplifier circuits amplify the power of audio signals to drive loads such as speakers. The degree of audio signal power amplification depends on the voltage at the power supply terminal (PVDD) of the audio power amplifier circuit. For example, when the volume of the audio signal to be played is high, the audio power amplifier circuit needs to amplify the audio signal power to a greater extent. When the volume of the audio signal to be played is low, the audio power amplifier circuit needs to amplify the audio signal power to a smaller extent. Therefore, the power supply circuit of the audio power amplifier circuit needs to include a voltage conversion circuit with a higher output voltage. However, when the audio power amplifier circuit needs to amplify the audio signal power to a smaller extent, using a voltage conversion circuit with a higher output voltage will affect the efficiency of the power supply circuit. Therefore, the power supply circuit of the audio power amplifier circuit also needs to include a voltage conversion circuit with a lower output voltage. That is, by selecting a voltage conversion circuit, a suitable voltage is provided to the audio power amplifier circuit to meet the requirements of power and efficiency.

[0043] In related technologies, a power supply circuit is provided, comprising a first voltage conversion circuit, a second voltage conversion circuit, a first transistor, a first diode, and a second diode. The first transistor and the first diode are sequentially disposed between the output terminal of the first voltage conversion circuit and the power supply terminal of the audio power amplifier circuit. The second diode is disposed between the output terminal of the second voltage conversion circuit and the power supply terminal of the audio power amplifier circuit. The first voltage conversion circuit receives a first input voltage and converts it into a first output voltage. The second voltage conversion circuit receives a second input voltage and converts it into a second output voltage, where the first output voltage is greater than the second output voltage. The power supply circuit operates as follows: the first transistor is turned on or off under the action of a control signal, transmitting either the first or second output voltage to the power supply terminal of the audio power amplifier circuit through the switching of the first and second diodes, thereby adjusting the audio power amplifier circuit's ability to amplify audio signals. However, due to the relatively large forward voltage drop of the diodes (typically around 0.7V), the diodes have high conduction losses, resulting in high losses in the power supply circuit. Furthermore, when the voltage to be transmitted to the power supply terminal of the audio power amplifier circuit is adjusted from the first output voltage to the second output voltage (the first output voltage is greater than the second output voltage), it takes a certain amount of time for the cathode voltage of the first diode to decrease from the first output voltage to the second output voltage, resulting in a strong lag in the voltage switching process and affecting the reliability of the power supply circuit.

[0044] Based on this, this disclosure provides a power supply circuit. Since the conduction loss of the second switching circuit is lower than that of the diode, the first and second switching circuits are used to select the appropriate voltage conversion circuit to transmit the output voltage to the power supply terminal of the audio power amplifier circuit, thereby reducing the power supply circuit losses. Furthermore, since the second switching circuit is controlled by the voltage at the second terminal of the first switching circuit and the second output voltage, no additional control circuit is needed to generate control signals, further reducing the power supply circuit losses and structural complexity. Simultaneously, the fast switching speed of the first and second switching circuits and the low hysteresis during voltage switching improve the reliability of the power supply circuit.

[0045] An exemplary embodiment of this disclosure provides a power supply circuit, such as Figure 1As shown, the power supply circuit includes a first voltage conversion circuit 10, a second voltage conversion circuit 20, a first switching circuit 30, and a second switching circuit 40. The input terminal of the first voltage conversion circuit 10 receives a first input voltage Vin1 and converts it into a first output voltage. The input terminal of the second voltage conversion circuit 20 receives a second input voltage Vin2 and converts it into a second output voltage. The first terminal of the first switching circuit 30 is electrically connected to the output terminal of the first voltage conversion circuit 10, and its control terminal receives a control signal S. The first terminal and the first control terminal of the second switching circuit 40 are both electrically connected to the second terminal of the first switching circuit 30, and both are electrically connected to the output terminal of the second voltage conversion circuit 20. The third terminal of the second switching circuit 40 is electrically connected to the power supply terminal of the audio power amplifier circuit 50. The first switching circuit 30 and the second switching circuit 40 transmit either the first or second output voltage to the power supply terminal of the audio power amplifier circuit 50.

[0046] In this embodiment, the power supply circuit includes a first voltage conversion circuit, a second voltage conversion circuit, a first switching circuit, and a second switching circuit. The first and second switching circuits are electrically connected between the first and second voltage conversion circuits and the audio power amplifier circuit, and are used to transmit the first or second output voltage to the power supply terminal of the audio power amplifier circuit. Since the first and second switching circuits have low conduction losses, selecting the appropriate voltage conversion circuit to transmit the output voltage to the power supply terminal of the audio power amplifier circuit through the first and second switching circuits reduces the power supply circuit losses. Furthermore, since the second switching circuit is controlled by the voltage at the second terminal of the first switching circuit and the second output voltage, no additional control circuit is needed to generate a control signal, further reducing the power supply circuit losses and its structural complexity.

[0047] For example, the control signal S can be issued through a control circuit that includes a processor.

[0048] In one embodiment, such as Figure 2 As shown, the first switching circuit 30 includes a first switching unit 31. The first terminal of the first switching unit 31 is electrically connected to the output terminal of the first voltage conversion circuit 10, and the second terminal of the first switching unit 31 is electrically connected to both the first terminal and the first control terminal of the second switching circuit 40. The control terminal of the first switching unit 31 is used to receive the control signal S.

[0049] In this embodiment, when the first switching unit is turned on under the control of the control signal, the second switching circuit can transmit a first output voltage to the power supply terminal of the audio power amplifier circuit. When the first switching unit is turned off under the control of the control signal, the second switching circuit can transmit a second output voltage to the power supply terminal of the audio power amplifier circuit. Since the second switching circuit can be controlled to output either a first or second output voltage to the power supply terminal of the audio power amplifier circuit simply by controlling the on / off state of the first switching unit with the control signal, the complexity of the power supply circuit control is reduced.

[0050] In one embodiment, the second switching circuit 40 includes a second switching unit 41 and a third switching unit 42. The first terminal of the second switching unit 41 is electrically connected to the second terminal of the first switching circuit 30, and the second terminal of the second switching unit 41 is electrically connected to the power supply terminal of the audio power amplifier circuit 50. The control terminal of the second switching unit 41 is electrically connected to the output terminal of the second voltage conversion circuit 20. The first terminal of the third switching unit 42 is electrically connected to the power supply terminal of the audio power amplifier circuit 50, the second terminal of the third switching unit 42 is electrically connected to the output terminal of the second voltage conversion circuit 20, and the control terminal of the third switching unit 42 is electrically connected to the second terminal of the first switching circuit 30.

[0051] In this embodiment, when the second switching unit is on and the third switching unit is off, the first voltage conversion circuit transmits a first output voltage to the power supply terminal of the audio power amplifier circuit through the first switching circuit and the second switching unit. When the second switching unit is off and the third switching unit is on, the second voltage conversion circuit transmits a second output voltage to the power supply terminal of the audio power amplifier circuit through the third switching unit. By switching the second and third switching units on and off, the power supply circuit can supply power to the power supply terminal of the audio power amplifier circuit with either the first or second output voltage, thereby reducing the complexity of the power supply circuit structure. Simultaneously, since the second and third switching units are controlled by the voltage at the second terminal of the first switching circuit and the second output voltage, no additional control circuit is needed to generate control signals, further reducing the complexity of the power supply circuit structure. Furthermore, since only one of the second and third switching units is on, the first output voltage is prevented from flowing back to the output terminal of the second voltage conversion circuit, thereby improving the reliability of the power supply circuit.

[0052] For example, the first terminal of the second switching unit 41 is electrically connected to the second terminal of the first switching unit 31. The control terminal of the third switching unit 42 is electrically connected to the second terminal of the first switching unit 31.

[0053] In one embodiment, such as Figure 3As shown, the first switching unit 31 includes a first transistor T1. The first terminal of the first transistor T1 is electrically connected to the output terminal of the first voltage conversion circuit 10, and the second terminal of the first transistor T1 is electrically connected to both the first terminal and the first control terminal of the second switching circuit 40. The control terminal of the first transistor T1 is used to receive the control signal S.

[0054] In this embodiment, since the transistor has low conduction loss and is easy to control, the power supply circuit loss and its control complexity are reduced by using the first transistor as the first switching unit.

[0055] In one embodiment, the first transistor T1 is a P-type field-effect transistor.

[0056] In this embodiment, the P-type field-effect transistor has a simple structure and is turned on or off based on the voltage difference between the gate and the source, thereby reducing the complexity of the power supply circuit structure and the complexity of control.

[0057] For example, the first terminal of the first transistor T1 is the source, the second terminal of the first transistor T1 is the drain, and the control terminal of the first transistor T1 is the gate.

[0058] For example, the first transistor T1 can also be an N-type field-effect transistor.

[0059] For example, the first switching unit 31 further includes a first diode D1. The anode of the first diode D1 is electrically connected to the second terminal of the first transistor T1, and the cathode of the first diode D1 is electrically connected to the first terminal of the first transistor T1. The first diode D1 can be the body diode of the first transistor T1.

[0060] In one embodiment, the second switching unit 41 includes a second transistor T2. The first terminal of the second transistor T2 is electrically connected to the second terminal of the first switching circuit 30, the second terminal of the second transistor T2 is used to be electrically connected to the power supply terminal of the audio power amplifier circuit 50, and the control terminal of the second transistor T2 is electrically connected to the output terminal of the second voltage conversion circuit 20.

[0061] In this embodiment, since the transistor has low conduction loss and is easy to control, the power supply circuit loss and its control complexity are reduced by using the second transistor as the second switching unit.

[0062] In one embodiment, the second transistor T2 is a P-type field-effect transistor.

[0063] In this embodiment, the P-type field-effect transistor has a simple structure and is turned on or off based on the voltage difference between the gate and the source, thereby reducing the complexity of the power supply circuit structure and the complexity of control.

[0064] For example, the first terminal of the second transistor T2 is the source, the second terminal of the second transistor T2 is the drain, and the control terminal of the second transistor T2 is the gate.

[0065] For example, the second transistor T2 can also be an N-type field-effect transistor.

[0066] For example, the second switching unit 41 further includes a second diode D2. The anode of the second diode D2 is electrically connected to the first terminal of the second transistor T2, and the cathode of the second diode D2 is electrically connected to the second terminal of the second transistor T2. The second diode D2 can be the body diode of the second transistor T2.

[0067] In one embodiment, the third switching unit 42 includes a third transistor T3. The first terminal of the third transistor T3 is electrically connected to the power supply terminal of the audio power amplifier circuit 50, the second terminal of the third transistor T3 is electrically connected to the output terminal of the second voltage conversion circuit 20, and the control terminal of the third transistor T3 is electrically connected to the second terminal of the first switching circuit 30.

[0068] In this embodiment, since the transistor has low conduction loss and is easy to control, the power supply circuit loss and its control complexity are reduced by using a third transistor as the third switching unit.

[0069] In one embodiment, the third transistor T3 is a P-type field-effect transistor.

[0070] In this embodiment, the P-type field-effect transistor has a simple structure and is turned on or off based on the voltage difference between the gate and the source, thereby reducing the complexity of the power supply circuit structure and the complexity of control.

[0071] For example, the first terminal of the third transistor T3 is the drain, the second terminal of the third transistor T3 is the source, and the control terminal of the third transistor T3 is the gate.

[0072] For example, the third transistor T3 can also be an N-type field-effect transistor.

[0073] For example, the third switching unit 42 further includes a third diode D3. The anode of the third diode D3 is electrically connected to the second terminal of the third transistor T3, and the cathode of the third diode D3 is electrically connected to the first terminal of the third transistor T3. The third diode D3 can be the body diode of the third transistor T3. Due to the presence of the third diode D3, when the power supply circuit needs to switch the first output voltage or the second output voltage to supply power to the power supply terminal of the audio power amplifier chip 60 at a faster speed, the unidirectional conduction characteristic of the third diode D3 can prevent the first output voltage Vin1 from flowing back to the output terminal of the second voltage conversion circuit 20, thereby improving the reliability of the power supply circuit.

[0074] For example, the first terminal of the first transistor T1 is electrically connected to the cathode of the first diode D1 and the output terminal of the first voltage conversion circuit 10. The second terminal of the first transistor T1 is electrically connected to the anode of the first diode D1, the first terminal of the second transistor T2, the anode of the second diode D2, and the control terminal of the third transistor T3. The gate of the first transistor T1 is used to receive the control signal S. The second terminal of the second transistor T2 is electrically connected to the cathode of the second diode D2, the first terminal of the third transistor T3, the cathode of the third diode D3, and the power supply terminal of the audio power amplifier circuit 50. The control terminal of the second transistor T2 is electrically connected to the second terminal of the third transistor T3, the anode of the third diode D3, and the output terminal of the second voltage conversion circuit 20.

[0075] In one embodiment, such as Figure 2 As shown, the first switching circuit 30 also includes a pull-down unit 32. The first end of the pull-down unit 32 is electrically connected to the second end of the first switching unit 31, and the second end of the pull-down unit 32 is used to be electrically connected to the ground terminal GND.

[0076] In this embodiment, when the first switching circuit is on, the power supply circuit supplies power to the power supply terminal of the audio power amplifier circuit with the first output voltage. When the first switching circuit is off, the power supply circuit supplies power to the power supply terminal of the audio power amplifier circuit with the second output voltage. However, when the first switching circuit switches from the on state to the off state, there is still a residual voltage at the second terminal of the first switching circuit, causing the power supply circuit to be unable to supply power to the power supply terminal of the audio power amplifier circuit with the second output voltage in a timely manner. By setting a pull-down unit to dissipate the residual voltage at the second terminal of the first switching circuit, the influence of the residual voltage on the power supply terminal of the audio power amplifier circuit is avoided, thereby improving the reliability of the power supply circuit.

[0077] For example, the first end of the pull-down unit 32 can also be electrically connected to an energy storage element or other electrical device to store and utilize residual voltage, thereby reducing power supply circuit losses.

[0078] In one embodiment, such as Figure 3 As shown, the pull-down unit includes a resistor R. The first end of the resistor R is electrically connected to the second end of the first switching unit 31, and the second end of the resistor R is used to be electrically connected to the ground terminal GND.

[0079] In this embodiment, by using a power-consuming element resistor as a pull-down unit, the residual voltage can be quickly dissipated, thereby improving the reliability of the power supply circuit.

[0080] In one embodiment, the input terminal of the first voltage conversion circuit 10 is used for electrical connection to the battery. The input terminal of the second voltage conversion circuit 20 is used for electrical connection to the battery via a step-down charge pump.

[0081] In this embodiment, by electrically connecting the first voltage conversion circuit to the battery, the battery voltage can be directly converted into a first output voltage for transmission to the power supply terminal of the audio power amplifier circuit, thus meeting the power amplification requirements. By electrically connecting the second voltage conversion circuit to the battery via a step-down charge pump, the stepped-down battery voltage can be converted into a second output voltage for transmission to the power supply terminal of the audio power amplifier circuit, thus meeting the power supply circuit efficiency requirements. By inputting different input voltages to the first and second voltage conversion circuits, the requirements for power amplification and efficiency can be met, thereby reducing power supply circuit losses and improving power supply circuit reliability.

[0082] For example, the ratio of the output voltage to the input voltage of the step-down charge pump circuit can be 1:2, 1:3, 1:4, etc.

[0083] In one embodiment, both the first voltage conversion circuit 10 and the second voltage conversion circuit 20 are boost circuits.

[0084] In this embodiment, since both the first input voltage and the second output voltage are less than the voltage required by the audio power amplifier circuit, the boost circuit can raise the first input voltage and the second input voltage to the first output voltage and the second output voltage respectively, so that the audio power amplifier circuit can amplify the power of the audio signal, thereby improving the reliability of the power supply circuit.

[0085] For example, such as Figure 4 As shown, the first voltage conversion circuit 10 includes a first boost circuit 11. The second voltage conversion circuit 20 includes a second boost circuit 21.

[0086] For example, the first voltage conversion circuit 10 is a Boost circuit. Figure 3 As shown, the first voltage conversion circuit 10 includes a first inductor L1, a fourth transistor T4, a fifth transistor T5, a first capacitor C1, a fourth diode D4, and a fifth diode D5. The first terminal of the first inductor L1 receives a first input voltage Vin1, and its second terminal is electrically connected to the first terminal of the fourth transistor T4, the cathode of the fourth diode D4, the first terminal of the fifth transistor T5, and the anode of the fifth diode D5. The second terminal of the fourth transistor T4 is electrically connected to the anode of the fourth diode D4 and the ground terminal GND. The second terminal of the fifth transistor T5 is electrically connected to the first terminal of the first switching circuit 30, the cathode of the fifth diode D5, and the first terminal of the first capacitor C1. The second terminal of the first capacitor C1 is electrically connected to the ground terminal GND.

[0087] For example, the fourth diode D4 and the fifth diode D5 can be the body diodes of the fourth transistor T4 and the fifth transistor T5, respectively.

[0088] For example, the second voltage conversion circuit 20 is a Boost circuit. The second voltage conversion circuit 20 includes a second inductor L2, a sixth transistor, a seventh transistor, a second capacitor C2, a sixth diode, and a seventh diode. The first terminal of the second inductor L2 receives the second input voltage Vin2, and its second terminal is electrically connected to the first terminal of the sixth transistor, the cathode of the sixth diode, the first terminal of the seventh transistor, and the anode of the seventh diode. The second terminal of the sixth transistor is electrically connected to the anode of the sixth diode and the ground terminal GND. The second terminal of the seventh transistor is electrically connected to the second terminal of the second switching circuit 40, the cathode of the seventh diode, and the first terminal of the second capacitor C2. The second terminal of the second capacitor C2 is electrically connected to the ground terminal GND.

[0089] For example, the sixth diode and the seventh diode can be the body diodes of the sixth transistor and the seventh transistor, respectively.

[0090] For example, the fourth transistor T4, the fifth transistor T5, the sixth transistor, and the seventh transistor can be either P-type or N-type field-effect transistors. When the fourth transistor T4, the fifth transistor T5, the sixth transistor, and the seventh transistor are all N-type field-effect transistors, the first terminal of the fourth transistor T4, the second terminal of the fifth transistor T5, the first terminal of the sixth transistor, and the second terminal of the seventh transistor are all drains, and the second terminal of the fourth transistor T4, the first terminal of the fifth transistor T5, the second terminal of the sixth transistor, and the first terminal of the seventh transistor are all sources.

[0091] In one embodiment, both the second voltage conversion circuit 20 and the audio power amplifier circuit 50 are disposed on the audio power amplifier chip.

[0092] In this embodiment, by integrating the second voltage conversion circuit and the audio power amplifier circuit into the audio power amplifier chip, the number of electrical components in the power supply circuit is reduced, thereby reducing the complexity of the power supply circuit structure.

[0093] For example, the sixth transistor, seventh transistor, sixth diode, and seventh diode in the second voltage conversion circuit 20 can be disposed in an audio power amplifier chip.

[0094] An exemplary embodiment of this disclosure provides a power supply circuit, such as Figure 3As shown, the power supply circuit includes a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, a resistor R, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and a fifth diode D5. The first terminal of the first inductor L1 is electrically connected to the battery Bat. The second terminal of the first inductor L1 is electrically connected to the drain of the fourth transistor T4, the source of the fifth transistor T5, the cathode of the fourth diode D4, and the anode of the fifth diode D5. The source of the fourth transistor T4 is electrically connected to the anode of the fourth diode D4 and the ground terminal GND. The drain of the fifth transistor T5 is electrically connected to the cathode of the fifth diode D5, the first terminal of the first capacitor C1, the source of the first transistor T1, and the cathode of the first diode D1. The drain of the first transistor T1 is electrically connected to the anode of the first diode D1, the source of the second transistor T2, the anode of the second diode D2, the gate of the third transistor T3, and the first terminal of the resistor R. The gate of the first transistor T1 is used to receive the control signal S. The drain of the second transistor T2 is electrically connected to the cathode of the second diode D2, the drain of the third transistor T3, the cathode of the third diode D3, and the power supply terminal of the audio power amplifier chip 60. The gate of the second transistor T2 is electrically connected to the voltage output terminal of the audio power amplifier chip 60, the source of the third transistor T3, the anode of the third diode D3, and the first terminal of the second capacitor C2. The first terminal of the second inductor L2 is used to connect to the battery Bat through the step-down charge pump 70, and the second terminal of the second inductor L2 is used to connect to the voltage input terminal of the audio power amplifier chip 60. The second terminals of the first capacitor C1, the second capacitor C2, and the second terminal of the resistor R are all used to connect to the ground terminal GND.

[0095] For example, when the audio power amplifier chip 60 requires a first output voltage, the control signal S turns on the first transistor T1. Since the source voltage of the second transistor T2 is greater than its gate voltage and the source voltage of the third transistor T3 is less than its gate voltage, the second transistor T2 is turned on and the third transistor T3 is turned off, and the power supply circuit transmits the first output voltage to the audio power amplifier chip 60. When the audio power amplifier chip 60 requires a second output voltage, the control signal S turns off the first transistor T1. After the first transistor T1 is turned off, there is still a residual voltage at the first terminal of the second transistor T2, so the second transistor T2 remains in the on state and the third transistor T3 remains in the off state. When the resistor R consumes the voltage at the first terminal of the second transistor T2, the source voltage of the second transistor T2 becomes less than its gate voltage and the source voltage of the third transistor T3 becomes greater than its gate voltage, so the second transistor T2 is turned off and the third transistor T3 is turned on, and the power supply circuit transmits the second output voltage to the audio power amplifier chip 60.

[0096] In one exemplary embodiment, an electronic device is provided, which includes the power supply circuit described above. The electronic device is, for example, a mobile phone, a laptop computer, a tablet computer, and a wearable device.

[0097] refer to Figure 5 As shown, the electronic device 400 may include one or more of the following components: a processing component 402, a memory 404, a power supply component 406, a multimedia component 408, an audio component 410, an input / output (I / O) interface 412, a sensor component 414, and a communication component 416.

[0098] Processing component 402 typically controls the overall operation of electronic device 400, such as operations associated with display, telephone calls, data communication, camera operation, and recording. Processing component 402 may include one or more processors 420 to execute instructions to perform all or part of the steps of the methods described above. Furthermore, processing component 402 may include one or more modules to facilitate interaction between processing component 402 and other components. For example, processing component 402 may include a multimedia module to facilitate interaction between multimedia component 408 and processing component 402.

[0099] Memory 404 is configured to store various types of data to support the operation of electronic device 400. Examples of this data include instructions for any application or method operating on electronic device 400, contact data, phonebook data, messages, pictures, videos, etc. Memory 404 can be implemented by any type of volatile or non-volatile storage terminal or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0100] Power supply component 406 provides power to various components of electronic device 400. Power supply component 406 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to electronic device 400.

[0101] Multimedia component 408 includes a screen that provides an output interface between electronic device 400 and user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of touch or swipe actions but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 408 includes a front-facing camera module and / or a rear-facing camera module. When electronic device 400 is in an operating mode, such as shooting mode or video mode, the front-facing camera module and / or rear-facing camera module may receive external multimedia data. Each front-facing camera module and rear-facing camera module may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0102] Audio component 410 is configured to output and / or input audio signals. For example, audio component 410 includes a microphone (MIC) configured to receive external audio signals when electronic device 400 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 404 or transmitted via communication component 416. In some embodiments, audio component 410 also includes a speaker for outputting audio signals.

[0103] I / O interface 412 provides an interface between processing component 402 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0104] Sensor assembly 414 includes one or more sensors for providing state assessments of various aspects of electronic device 400. For example, sensor assembly 414 may detect the on / off state of electronic device 400, the relative positioning of components such as the display and keypad of electronic device 400, changes in position of electronic device 400 or a component of electronic device 400, the presence or absence of user contact with electronic device 400, orientation or acceleration / deceleration of electronic device 400, and temperature changes of electronic device 400. Sensor assembly 414 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 414 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 414 may also include an accelerometer, gyroscope, magnetometer, pressure sensor, or temperature sensor.

[0105] Communication component 416 is configured to facilitate wired or wireless communication between electronic device 400 and other terminals. Electronic device 400 can access wireless networks based on communication standards, such as WiFi, 2G, 3G, 4G, 5G, or combinations thereof. In one exemplary embodiment, communication component 416 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 416 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0106] In an exemplary embodiment, the electronic device 400 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing terminals (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0107] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0108] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0109] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0110] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A power supply circuit, characterized in that, The power supply circuit includes: A first voltage conversion circuit, wherein the input terminal of the first voltage conversion circuit is used to receive a first input voltage, and the first voltage conversion circuit is used to convert the first input voltage into a first output voltage; The second voltage conversion circuit has an input terminal for receiving a second input voltage and is used to convert the second input voltage into a second output voltage. A first switching circuit, wherein a first terminal of the first switching circuit is electrically connected to the output terminal of the first voltage conversion circuit, and a control terminal of the first switching circuit is used to receive control signals; The second switching circuit has a first terminal and a first control terminal that are electrically connected to the second terminal of the first switching circuit. The second terminal and the second control terminal of the second switching circuit are electrically connected to the output terminal of the second voltage conversion circuit. The third terminal of the second switching circuit is used to be electrically connected to the power supply terminal of the audio power amplifier circuit. The first switching circuit and the second switching circuit are used to transmit the first output voltage or the second output voltage to the power supply terminal of the audio power amplifier circuit.

2. The power supply circuit according to claim 1, characterized in that, The first switching circuit includes: A first switching unit, wherein a first terminal of the first switching unit is electrically connected to the output terminal of the first voltage conversion circuit, and a second terminal of the first switching unit is electrically connected to both the first terminal and the first control terminal of the second switching circuit; the control terminal of the first switching unit is used to receive the control signal; and / or The second switching circuit includes: The second switching unit has a first terminal electrically connected to the second terminal of the first switching circuit, a second terminal electrically connected to the power supply terminal of the audio power amplifier circuit, and a control terminal electrically connected to the output terminal of the second voltage conversion circuit. The third switching unit has a first terminal for electrical connection to the power supply terminal of the audio power amplifier circuit, a second terminal for electrical connection to the output terminal of the second voltage conversion circuit, and a control terminal for electrical connection to the second terminal of the first switching circuit.

3. The power supply circuit according to claim 2, characterized in that, The first switching unit includes: A first transistor, wherein a first terminal of the first transistor is electrically connected to the output terminal of the first voltage conversion circuit, and a second terminal of the first transistor is electrically connected to both the first terminal and the first control terminal of the second switching circuit, and the control terminal of the first transistor is used to receive the control signal; and / or The second switching unit includes: The second transistor has a first terminal electrically connected to the second terminal of the first switching circuit, a second terminal electrically connected to the power supply terminal of the audio power amplifier circuit, and a control terminal electrically connected to the output terminal of the second voltage conversion circuit; and / or, The third switching unit includes: The third transistor has a first terminal that is electrically connected to the power supply terminal of the audio power amplifier circuit, a second terminal that is electrically connected to the output terminal of the second voltage conversion circuit, and a control terminal that is electrically connected to the second terminal of the first switching circuit.

4. The power supply circuit according to claim 3, characterized in that, The first transistor is a P-type field-effect transistor; and / or, the second transistor is a P-type field-effect transistor; and / or, the third transistor is a P-type field-effect transistor.

5. The power supply circuit according to claim 2, characterized in that, The first switching circuit also includes: A pull-down unit, wherein the first end of the pull-down unit is electrically connected to the second end of the first switch unit, and the second end of the pull-down unit is used to be electrically connected to the ground terminal.

6. The power supply circuit according to claim 5, characterized in that, The drop-down unit includes: A resistor, the first end of which is electrically connected to the second end of the first switching unit, and the second end of which is used to be electrically connected to the grounding terminal.

7. The power supply circuit according to claim 1, characterized in that, The input terminal of the first voltage conversion circuit is used to be electrically connected to the battery; the input terminal of the second voltage conversion circuit is used to be electrically connected to the battery via a step-down charge pump.

8. The power supply circuit according to claim 1, characterized in that, Both the first voltage conversion circuit and the second voltage conversion circuit are boost circuits.

9. The power supply circuit according to any one of claims 1 to 8, characterized in that, Both the second voltage conversion circuit and the audio power amplifier circuit are located on the audio power amplifier chip.

10. An electronic device, characterized in that, The electronic device includes a power supply circuit as described in any one of claims 1 to 9.

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