Power supply circuit and earphone power supply

Abstract

A power supply circuit and an earphone power supply, the power supply circuit comprising: a magnetic bead, one end of which is connected with a power supply input end; the direct-current voltage conversion chip is provided with a voltage input end, a voltage output end, an enabling control end and a feedback end, and the voltage input end is connected with the other end of the magnetic bead; the control unit comprises a first bidirectional diode, a second bidirectional diode and a third bidirectional diode; the first input end of the third bidirectional diode is connected with the output end of the first bidirectional diode, the second input end of the third bidirectional diode is connected with the output end of the second bidirectional diode, and the output end of the third bidirectional diode is connected with the enabling control end; one end of the first inductor is connected with the voltage output end, and the other end is connected with the power output end; the first resistor is connected between the other end of the first inductor and the feedback end; and a second resistor. According to the utility model, by designing the multi-path control unit, the power supply circuit is ensured to normally supply power to the main chip, and the stability of the power supply system is improved.

Description

Technical Field

[0001] The utility model relates to the field of electronic circuits, in particular to a power supply circuit and an earphone power supply. Background Art

[0002] At present, when designing the system for powering the main chip, general headphone products often adopt a single-circuit control power supply circuit, with only one line directly connected to the main chip. If the circuit fails, the main chip cannot be powered normally, the whole machine will not work, and the stability of the system cannot be guaranteed, which will lead to a poor experience of using the headphone product. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a power supply circuit, which can ensure stable power supply to the main chip and improve the stability of the power supply system.

[0004] The utility model also provides an earphone power supply.

[0005] According to the first aspect of the present invention, the power supply circuit includes:

[0006] A magnetic bead, one end of which is connected to the power input terminal;

[0007] A DC voltage conversion chip, comprising a voltage input terminal, a voltage output terminal, an enable control terminal and a feedback terminal, wherein the voltage input terminal is connected to the other end of the magnetic bead;

[0008] A control unit, comprising a first bidirectional diode, a second bidirectional diode and a third bidirectional diode; the first input end of the first bidirectional diode is used as a first control input end, and the second input end of the first bidirectional diode is used as a second control input end; the first input end of the second bidirectional diode is used as a third control input end, and the second input end of the second bidirectional diode is used as a fourth control input end; the first input end of the third bidirectional diode is connected to the output end of the first bidirectional diode, the second input end of the third bidirectional diode is connected to the output end of the second bidirectional diode, and the output end of the third bidirectional diode is connected to the enable control end; the first control input end is used to access a first enable control signal, the second control input end is used to access a second enable control signal, the third control input end is used to access a third enable control signal, and the fourth control input end is used to access a fourth enable control signal, and the first enable control signal, the second enable control signal, the third enable control signal and the fourth enable control signal have different sources;

[0009] A first inductor, one end of which is connected to the voltage output terminal, and the other end of which is connected to the power output terminal;

[0010] a first resistor connected between the other end of the first inductor and the feedback end;

[0011] The second resistor is connected between the feedback terminal and the ground line.

[0012] The power supply circuit according to the embodiment of the utility model has at least the following beneficial effects:

[0013] The magnetic beads can protect the circuit when it enters abnormal high voltage instantly. The DC voltage conversion chip is used to convert the input voltage value of the power input end into the voltage value required for the normal operation of the main chip. The control unit controls the enable control end of the DC voltage conversion chip through a multi-channel control circuit to ensure the normal operation of the DC voltage conversion chip, thereby ensuring that the power circuit normally supplies power to the main chip. The power supply circuit of the embodiment of the utility model is designed with a multi-channel control unit. The multi-channel control ensures the normal operation of the DC voltage conversion chip, thereby ensuring that the power supply circuit stably supplies power to the main chip, effectively avoiding the instability or even loss of control of the power supply circuit controlled by a single-channel circuit, resulting in the DC voltage conversion chip not working and unable to supply power to the main chip, thereby improving the stability of the power supply system and achieving a new and reliable product use experience.

[0014] According to some embodiments of the present invention, the control unit further includes:

[0015] a third resistor, wherein the first control input terminal is connected to the first enable control signal through the third resistor;

[0016] a fourth resistor, wherein the second control input terminal is connected to the second enable control signal through the fourth resistor;

[0017] a fifth resistor, wherein the third control input terminal is connected to the third enable control signal through the fifth resistor;

[0018] a sixth resistor, wherein the fourth control input terminal is connected to the fourth enable control signal through the sixth resistor;

[0019] a seventh resistor, connected between the output end of the first bidirectional diode and the first input end of the third bidirectional diode;

[0020] An eighth resistor is connected between the output end of the second bidirectional diode and the second input end of the third bidirectional diode.

[0021] According to some embodiments of the present utility model, the power supply circuit further includes:

[0022] An input filter unit connected between the other end of the magnetic bead and the ground line;

[0023] An output filter unit is connected between the other end of the first inductor and the power output end.

[0024] According to some embodiments of the present utility model, the input filtering unit includes:

[0025] A first input filter capacitor connected between the other end of the magnetic bead and the ground line;

[0026] The second input filter capacitor is connected between the other end of the magnetic bead and the ground line.

[0027] According to some embodiments of the present utility model, the output filtering unit includes:

[0028] A first output filter capacitor connected in parallel with the first resistor;

[0029] A second output filter capacitor connected in parallel with the second resistor;

[0030] a third output filter capacitor connected between the other end of the first inductor and the ground line;

[0031] A ninth resistor, one end of which is connected to the other end of the first inductor, and the other end of which is connected to the power output end.

[0032] According to some embodiments of the present invention, the power supply circuit further includes a first test point connected to the other end of the ninth resistor.

[0033] According to some embodiments of the present invention, the power supply circuit further includes a second test point connected to the enable control terminal.

[0034] According to some embodiments of the present invention, the power supply circuit further includes a tenth resistor arranged between the enable control terminal and the ground line.

[0035] According to some embodiments of the present invention, the DC voltage conversion chip is a TPS62200 chip.

[0036] The headphone power supply according to the second embodiment of the utility model includes the power circuit as described in the first embodiment. The headphone power supply in the utility model embodiment includes the power circuit as described in the first embodiment, and thus has all the beneficial effects of the power circuit as described in the first embodiment.

[0037] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0039] Figure 1 Detailed description of the invention Figure 2 is a circuit diagram of a power supply circuit according to an embodiment of the present invention.

[0040] Reference numerals:

[0041] Control unit 100,

[0042] Input filter unit 200,

[0043] Output filter unit 300. DETAILED DESCRIPTION

[0044] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0045] In the description of the present utility model, if there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0046] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] In the description of the present utility model, it should be noted that, unless otherwise clearly stated, terms such as limitation, setting, installation, connection, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present utility model based on the specific content of the technical solution.

[0048] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present utility model, not all embodiments.

[0049] See also Figure 1 As shown, Figure 1: is a circuit diagram of a power supply circuit of an embodiment of the utility model, the power supply circuit includes a magnetic bead B1, a DC voltage conversion chip, a control unit 100, a first inductor L1, a first resistor R1 and a second resistor R2;

[0050] A magnetic bead B1, one end of which is connected to the power input terminal;

[0051] A DC voltage conversion chip has a voltage input terminal, a voltage output terminal, an enable control terminal and a feedback terminal, and the voltage input terminal is connected to the other end of the magnetic bead B1;

[0052] The control unit 100 includes a first bidirectional diode D1, a second bidirectional diode D2 and a third bidirectional diode D3; the first input end of the first bidirectional diode D1 is used as a first control input end, and the second input end of the first bidirectional diode D1 is used as a second control input end; the first input end of the second bidirectional diode D2 is used as a third control input end, and the second input end of the second bidirectional diode D2 is used as a fourth control input end; the first input end of the third bidirectional diode D3 is connected to the output end of the first bidirectional diode D1, the second input end of the third bidirectional diode D3 is connected to the output end of the second bidirectional diode D2, and the output end of the third bidirectional diode D3 is connected to the enable control end; the first control input end is used to access a first enable control signal, the second control input end is used to access a second enable control signal, the third control input end is used to access a third enable control signal, and the fourth control input end is used to access a fourth enable control signal, and the first enable control signal, the second enable control signal, the third enable control signal and the fourth enable control signal all have different sources;

[0053] A first inductor L1, one end of which is connected to the voltage output terminal, and the other end of which is connected to the power output terminal;

[0054] A first resistor R1 is connected between the other end of the first inductor L1 and the feedback end;

[0055] The second resistor R2 is connected between the feedback terminal and the ground line.

[0056] The input power is input from the power input terminal, and connected to the voltage input terminal of the DC voltage conversion chip after passing through the magnetic bead B1. The voltage output terminal of the DC voltage conversion chip is connected to the power output terminal after passing through the first inductor L1 to stably output the voltage required by the main chip; the control unit 100 is used to control the enable control terminal of the DC voltage conversion chip.

[0057] The first enable control signal, the second enable control signal, the third enable control signal and the fourth enable control signal are derived from different output terminals of other control chips, and are input into the first control input terminal, the second control input terminal, the third control input terminal and the fourth control input terminal respectively through software control; when the main chip needs to be powered, the first enable control signal, the second enable control signal, the third enable control signal and the fourth enable control signal are all kept at a high level, and the output is also at a high level after passing through the first bidirectional diode D1, the second bidirectional diode D2 and the third bidirectional diode D3 in the control unit 100, that is, the enable control terminal outputted by the control unit 100 to the DC voltage conversion chip is at a high level, and the control output to the DC voltage conversion chip starts to work normally; wherein, the first bidirectional diode D1, the second bidirectional diode D2 and the third bidirectional diode D3 can prevent voltage crosstalk between multiple enable control signals.

[0058] The magnetic bead B1 can protect the circuit when it enters abnormal high voltage instantly. The DC voltage conversion chip is used to convert the input voltage value of the power input terminal into the voltage value required for the normal operation of the main chip. The control unit 100 controls the enable control terminal of the DC voltage conversion chip through a multi-channel control circuit to ensure the normal operation of the DC voltage conversion chip, thereby ensuring that the power supply circuit supplies power to the main chip normally. The power supply circuit of the embodiment of the utility model is designed with a multi-channel control control unit 100. The multi-channel control ensures the normal operation of the DC voltage conversion chip, thereby ensuring that the power supply circuit supplies power to the main chip stably, effectively avoiding the circuit instability or even loss of control during the power supply process of a single-channel circuit control, resulting in the DC voltage conversion chip not working and unable to supply power to the main chip, thereby improving the stability of the power supply system and achieving a new and reliable product use effect experience. In addition, the circuit of the above-mentioned technical solution of the utility model is simple and reliable, and has a high practical value.

[0059] like Figure 1 As shown, in some embodiments, the control unit 100 further includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8;

[0060] A third resistor R3, the first control input terminal is connected to the first enable control signal through the third resistor R3;

[0061] A fourth resistor R4, the second control input terminal is connected to the second enable control signal through the fourth resistor R4;

[0062] A fifth resistor R5, the third control input terminal is connected to the third enable control signal through the fifth resistor R5;

[0063] A sixth resistor R6, the fourth control input terminal is connected to the fourth enable control signal through the sixth resistor R6;

[0064] a seventh resistor R7 connected between the output end of the first bidirectional diode D1 and the first input end of the third bidirectional diode D3;

[0065] The eighth resistor R8 is connected between the output end of the second bidirectional diode D2 and the second input end of the third bidirectional diode D3.

[0066] The third resistor R3 is arranged between the first control input terminal and the first input terminal of the first bidirectional diode D1, the fourth resistor R4 is arranged between the second control input terminal and the second input terminal of the first bidirectional diode D1, the fifth resistor R5 is arranged between the third control input terminal and the first input terminal of the second bidirectional diode D2, the sixth resistor R6 is arranged between the fourth control input terminal and the second input terminal of the second bidirectional diode D2, and the third resistor R3 is arranged between the first control input terminal and the first input terminal of the first bidirectional diode D1, and can play the role of current limiting and buffering between the first to fourth control input terminals and the input terminals of the first bidirectional diode D1 and the second bidirectional diode D2, so as to prevent the large current from entering the chip instantly and causing adverse effects on the circuit. The seventh resistor R7 is arranged between the output terminal of the first bidirectional diode D1 and the first input terminal of the third bidirectional diode D3, and the eighth resistor R8 is arranged between the output terminal of the second bidirectional diode D2 and the second input terminal of the third bidirectional diode D3, and can form a buffer between the first bidirectional diode D1, the second bidirectional diode D2 and the third bidirectional diode D3, so as to further protect the circuit.

[0067] like Figure 1 As shown, in some embodiments, the power supply circuit further includes an input filter unit 200 and an output filter unit 300;

[0068] The input filter unit 200 is connected between the other end of the magnetic bead B1 and the ground line;

[0069] The output filter unit 300 is connected between the other end of the first inductor L1 and the output end of the power supply.

[0070] The main function of the input filter unit 200 and the output filter unit 300 is to isolate the influence of various external interference signals on the internal circuit, thereby improving the anti-interference ability of the circuit and the stability of the circuit.

[0071] like Figure 1 As shown, in some embodiments, the input filter unit 200 includes a first input filter capacitor C1 and a second input filter capacitor C2;

[0072] The first input filter capacitor C1 is connected between the other end of the magnetic bead B1 and the ground line;

[0073] The second input filter capacitor C2 is connected between the other end of the magnetic bead B1 and the ground line.

[0074] The input filter unit 200 is arranged between the other end of the magnetic bead B1 and the ground wire, which can reduce the noise and interference at the input end. The first input filter capacitor C1 serves as a low-frequency filter capacitor at the input end and can be used to filter out power supply ripples. The second input filter capacitor C2 serves as a medium- and high-frequency filter capacitor at the input end and can be used to filter out power supply glitches.

[0075] like Figure 1 As shown, in some embodiments, the output filter unit 300 includes a first output filter capacitor C3, a second output filter capacitor C4, a third output filter capacitor C5 and a ninth resistor R9;

[0076] A first output filter capacitor C3 is connected in parallel with the first resistor R1;

[0077] A second output filter capacitor C4 is connected in parallel with the second resistor R2;

[0078] A third output filter capacitor C5 is connected between the other end of the first inductor L1 and the ground line;

[0079] The ninth resistor R9 has one end connected to the other end of the first inductor L1 , and the other end connected to the power output end.

[0080] The output filter unit 300 is arranged between the other end of the first inductor L1 and the power output end, which can reduce the noise and interference at the output end. Among them, the first output filter capacitor C3 and the second output filter capacitor C4 are used as medium and high frequency filter capacitors at the output end, which can filter out power spikes and glitches. The third filter capacitor C5 is a low frequency filter capacitor at the output end, which can filter out power spikes and glitches. In addition, if necessary, the third output filter capacitor C5 can form an RC filter circuit with the ninth resistor R9 to achieve better filtering and noise reduction effects.

[0081] like Figure 1 As shown, in some embodiments, the power supply circuit further includes a first test point TP1 connected to the other end of the ninth resistor R9. The reserved first test point TP1 is used to detect the voltage state of the power supply circuit of the present application output to the main chip when a circuit failure occurs, so as to facilitate timely detection and elimination of circuit failures.

[0082] like Figure 1 As shown, in some embodiments, the power supply circuit further includes a second test point TP2 connected to the enable control terminal. The second test point TP2 is reserved for detecting the level state of the enable control terminal of the DC voltage conversion chip when a circuit failure occurs, that is, Figure 1 The EN pin level status of U1 in the circuit is convenient for timely detection and troubleshooting of circuit faults.

[0083] like Figure 1As shown, in some embodiments, the power supply circuit further includes a tenth resistor R10 disposed between the enable control terminal and the ground line. When there is no need to power the main chip, the first control input terminal, the second control input terminal, the third control input terminal, and the fourth control input terminal have no signal input under software control, and the tenth resistor R10 can ensure that the enable control terminal of the DC voltage conversion chip is always in a low level state.

[0084] In some embodiments, the DC voltage conversion chip is a TPS62200 chip. Figure 1 As shown, the VI pin of the TPS62200 chip is connected to the other end of the magnetic bead B1, the SW pin is connected to one end of the first inductor L1, the GND pin is grounded, the FB pin is connected to the middle of the first resistor R1 and the second resistor R2, and the EN pin is connected to the control unit 100 and is enabled and controlled by the control unit 100. In some embodiments, an input filter unit 200 is connected between the VI pin of the TPS62200 chip and the other end of the magnetic bead B1.

[0085] The embodiment of the present invention also provides an earphone power supply, which includes the power supply circuit described in the above embodiment. The earphone power supply in the embodiment of the present invention includes the power supply circuit described in the above embodiment, and thus has all the beneficial effects of the power supply circuit described in the embodiment of the first aspect.

[0086] By adding this power supply circuit to the headphone power supply, the multi-channel control control unit 100 ensures the normal operation of the DC voltage conversion chip, thereby ensuring that the power supply circuit stably supplies power to the main chip of the headphone, thereby improving the stability of the headphone power supply system and achieving a new and reliable headphone product experience. In addition, the above technical solution of the utility model is simple and reliable, and has high practical value.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0088] Although the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, the present invention is not limited to the above embodiments. Those skilled in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and purpose of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A power supply circuit, characterized in that: include: A magnetic bead, one end of which is connected to the power input terminal; A DC voltage conversion chip, comprising a voltage input terminal, a voltage output terminal, an enable control terminal and a feedback terminal, wherein the voltage input terminal is connected to the other end of the magnetic bead; A control unit, comprising a first bidirectional diode, a second bidirectional diode and a third bidirectional diode; the first input end of the first bidirectional diode is used as a first control input end, and the second input end of the first bidirectional diode is used as a second control input end; the first input end of the second bidirectional diode is used as a third control input end, and the second input end of the second bidirectional diode is used as a fourth control input end; the first input end of the third bidirectional diode is connected to the output end of the first bidirectional diode, the second input end of the third bidirectional diode is connected to the output end of the second bidirectional diode, and the output end of the third bidirectional diode is connected to the enable control end; The first control input terminal is used to receive a first enable control signal, the second control input terminal is used to receive a second enable control signal, the third control input terminal is used to receive a third enable control signal, and the fourth control input terminal is used to receive a fourth enable control signal, and the first enable control signal, the second enable control signal, the third enable control signal, and the fourth enable control signal are all from different sources; A first inductor, one end of which is connected to the voltage output terminal, and the other end of which is connected to the power output terminal; a first resistor connected between the other end of the first inductor and the feedback end; The second resistor is connected between the feedback terminal and the ground line.

2. The power supply circuit according to claim 1, characterized in that: The control unit also includes: a third resistor, wherein the first control input terminal is connected to the first enable control signal through the third resistor; a fourth resistor, wherein the second control input terminal is connected to the second enable control signal through the fourth resistor; a fifth resistor, wherein the third control input terminal is connected to the third enable control signal through the fifth resistor; a sixth resistor, wherein the fourth control input terminal is connected to the fourth enable control signal through the sixth resistor; a seventh resistor, connected between the output end of the first bidirectional diode and the first input end of the third bidirectional diode; An eighth resistor is connected between the output end of the second bidirectional diode and the second input end of the third bidirectional diode.

3. The power supply circuit according to claim 1, characterized in that: The power supply circuit further comprises: An input filter unit connected between the other end of the magnetic bead and the ground line; An output filter unit is connected between the other end of the first inductor and the power output end.

4. The power supply circuit according to claim 3, characterized in that: The input filtering unit comprises: A first input filter capacitor connected between the other end of the magnetic bead and the ground line; The second input filter capacitor is connected between the other end of the magnetic bead and the ground line.

5. The power supply circuit according to claim 3, characterized in that: The output filtering unit comprises: A first output filter capacitor connected in parallel with the first resistor; A second output filter capacitor connected in parallel with the second resistor; a third output filter capacitor connected between the other end of the first inductor and the ground line; A ninth resistor, one end of which is connected to the other end of the first inductor, and the other end of which is connected to the power output end.

6. The power supply circuit according to claim 5, characterized in that: The power supply circuit also includes a first test point connected to the other end of the ninth resistor.

7. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes a second test point connected to the enable control terminal.

8. The power supply circuit according to claim 1, characterized in that: The power supply circuit further includes a tenth resistor arranged between the enable control terminal and the ground line.

9. The power supply circuit according to claim 1, characterized in that: The DC voltage conversion chip is a TPS62200 chip.

10. An earphone power supply, characterized in that: The invention comprises a power supply circuit as claimed in any one of claims 1 to 9.

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