Power switch circuit
By controlling the charge and discharge of the inductor through the power switch circuit, the low voltage problem caused by direct battery power supply in the speaker is solved, the efficient use of the battery and the improvement of sound quality are achieved, and the risk of speaker burning is reduced.
Patent Information
- Application Number
- CN202422170958.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-09-04
AI Technical Summary
In traditional speakers, the battery directly powers the amplifier, resulting in a low operating voltage. When a large music signal is input, the efficiency is reduced, the current increases, the battery consumption increases, the sound quality is poor, and there is a risk of burning the speaker.
A power switch circuit is used, including a power input module, an inductor, a MOS tube, an output module and a control module. The switch of the MOS tube is controlled by the control chip U15 to realize the charging and discharging of the inductor and increase the operating voltage of the power amplifier.
When a large music signal is input, it reduces battery consumption, improves efficiency, extends speaker working time, improves sound quality, and reduces the risk of speaker burning.
Smart Images
Figure CN223428436U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power supply, in particular to a power switch circuit. Background Art
[0002] Traditional battery-powered speakers mostly use the battery to directly power the amplifier, which operates at a low voltage. When a high-input music signal is applied, the output signal overloads and clips (similar to a square wave). This effectively applies a DC voltage to the speaker, resulting in high current flow. This ultimately increases battery consumption, reduces efficiency, shortens operating time, and reduces sound quality, potentially damaging the speaker. Utility Model Content
[0003] The purpose of the utility model is to provide a power switch circuit, which solves the problem that the existing speakers use batteries to directly power the power amplifier, resulting in a low operating voltage of the power amplifier.
[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:
[0005] A power switch circuit includes a power input module, an inductor L8, a MOS transistor Q15, an output module, and a control module. The input end of the power input module is used to connect to a power source; one end of the inductor L8 is connected to the input end of the power input module; the drain of the MOS transistor Q15 is connected to the other end of the inductor L8; the input end of the output module is connected to the drain of the MOS transistor Q15; the input end of the control module is connected to the output end of the power input module, and the output end of the control module is connected to the gate of the MOS transistor Q15, the source of the MOS transistor Q15, and the input end of the output module.
[0006] A further technical solution is: the power input module includes an electrolytic capacitor C103 and a capacitor C99; the positive electrode of the electrolytic capacitor C103 and one end of the capacitor C99 are both used to connect to the positive electrode of the power supply; the positive electrode of the electrolytic capacitor C103 is connected to one end of the inductor L8 and the input end of the control module; the negative electrode of the electrolytic capacitor C103 and the other end of the capacitor C99 are both grounded.
[0007] A further technical solution is: the control module includes a control chip U15, a resistor R150 and a resistor R151; the control chip U15 is UC3843A ；Pin 7 of the control chip U15 is connected to the positive electrode of the electrolytic capacitor C103 and one end of the inductor L8; pin 6 of the control chip U15 is connected to one end of the resistor R150; pin 5 of the control chip U15 is grounded; one end of the resistor R151 and the other end of the resistor R150 are connected to the gate of the MOS tube Q15; pin 1 of the control chip U15 and pin 2 of the control chip U15 are connected to the input end of the output module; pin 3 of the control chip U15, pin 4 of the control chip U15, pin 8 of the control chip U15, and the other end of the resistor R151 are connected to the source of the MOS tube Q15.
[0008] A further technical solution is: the control module also includes a resistor R115, a capacitor C96, a resistor R120 and a resistor R149; one end of the resistor R115 is connected to the input end of the output module; the other end of the resistor R115 is connected to one end of the resistor R149; the other end of the resistor R149 is connected to one end of the capacitor C96, pin 2 of the control chip U15, and one end of the resistor R120; the other end of the capacitor C96 is connected to pin 1 of the control chip U15; the other end of the resistor R120 is grounded.
[0009] A further technical solution is: the control module also includes a transistor Q14, a resistor R148, a capacitor C98, a resistor R147, a resistor R119 and a capacitor C146; the collector of the transistor Q14, one end of the resistor R148, and one end of the capacitor C98 are all connected to pin 8 of the control chip U15; the other end of the capacitor C98 is grounded; the base of the transistor Q14, the other end of the resistor R148, and one end of the capacitor C146 are all connected to pin 4 of the control chip U15; the emitter of the transistor Q14 is connected to one end of the resistor R147; the other end of the resistor R147 and one end of the resistor R119 are both connected to pin 3 of the control chip U15; the other end of the resistor R119 is connected to the other end of the resistor R151.
[0010] A further technical solution is: the control module also includes a resistor R158 and a resistor R159; one end of the resistor R158 and one end of the resistor R159 are both connected to the other end of the resistor R151; the other end of the resistor R158 and the other end of the resistor R159 are both grounded.
[0011] A further technical solution is: the power switch circuit further includes a diode D28, a diode D29, a diode D41 and a diode D42; the anode of the diode D28, the anode of the diode D29, the anode of the diode D41 and the anode of the diode D42 are all connected to the drain of the MOS transistor Q15; the cathode of the diode D28, the cathode of the diode D29, the cathode of the diode D41 and the cathode of the diode D42 are all connected to one end of the resistor R115.
[0012] A further technical solution is: the output module includes an electrolytic capacitor C102 and an electrolytic capacitor C95; the positive electrode of the electrolytic capacitor C102 and the positive electrode of the electrolytic capacitor C95 are both connected to one end of the resistor R115; the negative electrode of the electrolytic capacitor C102 and the negative electrode of the electrolytic capacitor C95 are both grounded.
[0013] Compared with the prior art, the beneficial effects of the present invention are:
[0014] When the high-frequency, high-efficiency PWM signal from control chip U15 controls MOS transistor Q15 to turn on, inductor L8 is charged; when the high-frequency, high-efficiency PWM signal from control chip U15 controls MOS transistor Q15 to turn off, inductor L8 is discharged. This effectively increases the operating voltage of the power amplifier, thereby reducing battery consumption, improving efficiency, extending operating time, and enhancing sound quality when inputting large music signals, while also reducing the risk of speaker burnout. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is an electrical block diagram of a power switch circuit in this embodiment;
[0016] Figure 2 FIG. 4 is a circuit structure topology diagram of a power switch circuit in this embodiment.
[0017] Markings and corresponding parts names in the accompanying drawings:
[0018] 100-power input module; 200-output module; 300-control module. DETAILED DESCRIPTION
[0019] The present invention will be further described below in conjunction with the accompanying drawings.
[0020] Example 1
[0021] This embodiment provides a power switch circuit, such as Figure 1As shown in the figure, it comprises a power input module 100, an inductor L8, a MOS tube Q15, an output module 200 and a control module 300, the input end of the power input module 100 is used for connecting with a power supply; one end of the inductor L8 is connected with the input end of the power input module 100; the drain of the MOS tube Q15 is connected with the other end of the inductor L8; the input end of the output module 200 is connected with the drain of the MOS tube Q15; the input end of the control module 300 is connected with the output end of the power input module 100, and the output end of the control module 300 is connected with the gate of the MOS tube Q15, the source of the MOS tube Q15 and the input end of the output module 200.
[0022] In the embodiment, as shown in the figure, Figure 2 The power input module 100 comprises a resistor R3 and a capacitor C3; one end of the resistor R3 is used for connecting with the positive pole of a power supply, and the other end of the resistor R3 is connected with one end of the inductor L8; the other end of the resistor R3 and one end of the capacitor C3 are connected with the control module 300; the other end of the capacitor C3 is used for connecting with the negative pole of the power supply, and the other end of the capacitor C3 is grounded.
[0023] In the embodiment, as shown in the figure, Figure 2 The power input module 100 comprises an electrolytic capacitor C103 and a capacitor C99; the positive pole of the electrolytic capacitor C103 and one end of the capacitor C99 are used for connecting with the positive pole of a power supply; the positive pole of the electrolytic capacitor C103 is connected with one end of the inductor L8 and the input end of the control module 300; the negative pole of the electrolytic capacitor C103 and the other end of the capacitor C99 are grounded.
[0024] In the embodiment, as shown in the figure, Figure 2 The control module 300 comprises a control chip U15, a resistor R150 and a resistor R151; the control chip U15 is UC3843A ； The 7th pin of the control chip U15 is connected with the positive pole of the electrolytic capacitor C103 and one end of the inductor L8; the 6th pin of the control chip U15 is connected with one end of the resistor R150; the 5th pin of the control chip U15 is grounded; one end of the resistor R151 and the other end of the resistor R150 are connected with the gate of the MOS tube Q15; the 1st pin and the 2nd pin of the control chip U15 are connected with the input end of the output module 200; the 3rd pin, the 4th pin, the 8th pin of the control chip U15 and the other end of the resistor R151 are connected with the source of the MOS tube Q15.
[0025] In the embodiment, as shown in the figure, Figure 2As shown, the control module 300 also includes a resistor R115, a capacitor C96, a resistor R120 and a resistor R149; one end of the resistor R115 is connected to the input end of the output module 200; the other end of the resistor R115 is connected to one end of the resistor R149; the other end of the resistor R149 is connected to one end of the capacitor C96, pin 2 of the control chip U15, and one end of the resistor R120; the other end of the capacitor C96 is connected to pin 1 of the control chip U15; the other end of the resistor R120 is grounded.
[0026] In this embodiment, if Figure 2 As shown, the control module 300 also includes a transistor Q14, a resistor R148, a capacitor C98, a resistor R147, a resistor R119 and a capacitor C146; the collector of the transistor Q14, one end of the resistor R148 and one end of the capacitor C98 are all connected to pin 8 of the control chip U15; the other end of the capacitor C98 is grounded; the base of the transistor Q14, the other end of the resistor R148 and one end of the capacitor C146 are all connected to pin 4 of the control chip U15; the emitter of the transistor Q14 is connected to one end of the resistor R147; the other end of the resistor R147 and one end of the resistor R119 are all connected to pin 3 of the control chip U15; the other end of the resistor R119 is connected to the other end of the resistor R151.
[0027] In this embodiment, if Figure 2 As shown, the control module 300 further includes a resistor R158 and a resistor R159; one end of the resistor R158 and one end of the resistor R159 are both connected to the other end of the resistor R151; the other end of the resistor R158 and the other end of the resistor R159 are both grounded.
[0028] In this embodiment, if Figure 2 As shown, the power switch circuit further includes a diode D28, a diode D29, a diode D41, and a diode D42; the anode of the diode D28, the anode of the diode D29, the anode of the diode D41, and the anode of the diode D42 are all connected to the drain of the MOS transistor Q15; the cathode of the diode D28, the cathode of the diode D29, the cathode of the diode D41, and the cathode of the diode D42 are all connected to one end of the resistor R115.
[0029] In this embodiment, if Figure 2 As shown, the output module 200 includes an electrolytic capacitor C102 and an electrolytic capacitor C95; the positive electrode of the electrolytic capacitor C102 and the positive electrode of the electrolytic capacitor C95 are both connected to one end of the resistor R115; the negative electrode of the electrolytic capacitor C102 and the negative electrode of the electrolytic capacitor C95 are both grounded.
[0030] The working principle of a power switch circuit in this embodiment is as follows:
[0031] Transistor Q15, inductor L8, capacitors D28, D29, D41, and D42 form the DC-DC boost unit. Resistors R115, R149, and R120 form the output voltage feedback circuit. Electrolytic capacitor C103 serves as a filter capacitor for the power input, while electrolytic capacitors C102 and C95 serve as filter capacitors for the boosted power output. When the power input voltage is 9V-15V, the power switch circuit outputs 24V to power the amplifier circuit. This effectively increases the operating voltage of the amplifier, thereby reducing battery consumption, improving efficiency, extending operating time, and enhancing sound quality when inputting high-frequency music signals, while also reducing the risk of speaker burnout.
[0032] Although the present invention has been described herein with reference to a number of illustrative embodiments thereof, it will be understood that numerous other modifications and implementations may be devised by those skilled in the art that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, the drawings, and the claims, numerous variations and modifications may be made to the components and / or arrangement of the subject combination arrangement. In addition to variations and modifications to the components and / or arrangement, other uses will also be apparent to those skilled in the art.
Claims
1. A power switch circuit, characterized in that: include: A power input module (100), the input end of the power input module (100) being used for connection to a power source; an inductor L8, one end of the inductor L8 being connected to an input end of the power input module (100); MOS transistor Q15, wherein the drain of the MOS transistor Q15 is connected to the other end of the inductor L8; an output module (200), wherein an input end of the output module (200) is connected to the drain of the MOS tube Q15; A control module (300), wherein the input end of the control module (300) is connected to the output end of the power input module (100), and the output end of the control module (300) is connected to the gate of the MOS tube Q15, the source of the MOS tube Q15, and the input end of the output module (200).
2. The power switch circuit according to claim 1, wherein: The power input module (100) includes an electrolytic capacitor C103 and a capacitor C99; The positive electrode of the electrolytic capacitor C103 and one end of the capacitor C99 are both used to connect to the positive electrode of the power supply; The positive electrode of the electrolytic capacitor C103 is connected to one end of the inductor L8 and the input end of the control module (300); The negative electrode of the electrolytic capacitor C103 and the other end of the capacitor C99 are both grounded.
3. The power switch circuit according to claim 2, wherein: The control module (300) includes a control chip U15, a resistor R150, and a resistor R151; The control chip U15 is UC3843A ； Pin 7 of the control chip U15 is connected to the positive electrode of the electrolytic capacitor C103 and one end of the inductor L8; Pin 6 of the control chip U15 is connected to one end of the resistor R150; Pin 5 of the control chip U15 is grounded; One end of the resistor R151 and the other end of the resistor R150 are both connected to the gate of the MOS transistor Q15; Pin 1 of the control chip U15 and pin 2 of the control chip U15 are both connected to the input end of the output module (200); Pin 3 of the control chip U15 , pin 4 of the control chip U15 , pin 8 of the control chip U15 , and the other end of the resistor R151 are all connected to the source of the MOS transistor Q15 .
4. The power switch circuit according to claim 3, wherein: The control module (300) further includes a resistor R115, a capacitor C96, a resistor R120, and a resistor R149; One end of the resistor R115 is connected to the input end of the output module (200); The other end of the resistor R115 is connected to one end of the resistor R149; The other end of the resistor R149 is connected to one end of the capacitor C96, pin 2 of the control chip U15, and one end of the resistor R120; The other end of the capacitor C96 is connected to pin 1 of the control chip U15; The other end of the resistor R120 is grounded.
5. The power switch circuit according to claim 4, wherein: The control module (300) further includes a transistor Q14, a resistor R148, a capacitor C98, a resistor R147, a resistor R119 and a capacitor C146; The collector of the transistor Q14, one end of the resistor R148, and one end of the capacitor C98 are all connected to pin 8 of the control chip U15; The other end of the capacitor C98 is grounded; The base of the transistor Q14, the other end of the resistor R148, and one end of the capacitor C146 are all connected to pin 4 of the control chip U15; The emitter of the transistor Q14 is connected to one end of the resistor R147; The other end of the resistor R147 and one end of the resistor R119 are both connected to pin 3 of the control chip U15; The other end of the resistor R119 is connected to the other end of the resistor R151 .
6. The power switch circuit according to claim 5, wherein: The control module (300) further includes a resistor R158 and a resistor R159; One end of the resistor R158 and one end of the resistor R159 are both connected to the other end of the resistor R151; The other end of the resistor R158 and the other end of the resistor R159 are both grounded.
7. The power switch circuit according to claim 6, wherein: Also included are diode D28, diode D29, diode D41, and diode D42; The anode of the diode D28, the anode of the diode D29, the anode of the diode D41, and the anode of the diode D42 are all connected to the drain of the MOS transistor Q15; The cathode of the diode D28 , the cathode of the diode D29 , the cathode of the diode D41 , and the cathode of the diode D42 are all connected to one end of the resistor R115 .
8. The power switch circuit according to claim 7, wherein: The output module (200) includes an electrolytic capacitor C102 and an electrolytic capacitor C95; The positive electrode of the electrolytic capacitor C102 and the positive electrode of the electrolytic capacitor C95 are both connected to one end of the resistor R115; The negative electrodes of the electrolytic capacitor C102 and the electrolytic capacitor C95 are both grounded.