Interleaved flyback acoustic switch power supply

Abstract

The utility model discloses a kind of staggered flyback acoustic switch power supplies, including power module, main control module, feedback module and at least two flyback conversion modules;Power module is connected with alternating current power supply;Main control module is connected with power module and has at least two PWM output ends;At least two flyback conversion modules are parallel between PWM output end and power amplifier, and flyback conversion module is connected with power module;Feedback module is connected with flyback conversion module and main control module respectively;Main control module can output mutually staggered PWM signal to flyback conversion module by PWM output end, to make different flyback conversion module alternate output;By the staggered parallel multiple flyback conversion modules, the staggered output of current is realized, to increase power and improve power efficiency, reduce EM I and reduce output ripple, meet 200W-500W power section acoustic use.

Description

Technical Field

[0001] This utility model relates to the field of audio equipment, and in particular to an interleaved flyback audio switching power supply. Background Technology

[0002] Audio power supplies generally use flyback switching power supplies to power amplifiers. However, existing flyback switching power supplies can only achieve a maximum power of 150-200W. Higher power switching power supplies can only use forward or LLC / push-pull / bridge series power supplies. With the increasing low power requirements of Energy Star, the standby power consumption of forward / LLC / push-pull / bridge series power supplies cannot meet the Energy Star requirements. A separate flyback power supply must be added as a standby power supply, and then optocouplers and MOSFETs are used to turn on the switch to enable the forward / LLC / push-pull / bridge series power supplies to work normally. This type of switching power supply is not only complex in circuit structure, but also expensive. Therefore, there is an urgent need for an interleaved flyback audio switching power supply to solve the above problems. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an interleaved flyback acoustic switching power supply.

[0004] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: an interleaved flyback acoustic switching power supply, including a power module, a main control module, a feedback module, and at least two flyback converter modules;

[0005] The power module is connected to an AC power source;

[0006] The main control module is connected to the power supply module and has at least two PWM output terminals;

[0007] At least two flyback converter modules are connected in parallel between the PWM output and the power amplifier, and the flyback converter modules are connected to the power supply module.

[0008] The feedback module is connected to both the flyback converter module and the main control module.

[0009] The main control module can output interleaved PWM signals to the flyback converter module through the PWM output terminal, so that different flyback converter modules can output alternately.

[0010] As one of the preferred embodiments of this utility model, the flyback converter module includes a MOSFET Q4 and a transformer T1. The gate of the MOSFET Q4 is connected to the first PWM output terminal of the main control module, the drain of the MOSFET Q4 is connected to one end of the primary winding of the transformer T1, the other end of the primary winding of the transformer T1 is connected to the power supply module, the secondary winding of the transformer T1 is connected to the power amplifier, and the source of the MOSFET Q4 is connected to the ground terminal.

[0011] As one of the preferred embodiments of this utility model, the feedback module includes an optocoupler U4, a Zener diode U5, a resistor R7, resistors R23-R24, resistors R33-R34, and a capacitor C28. One end of resistor R23 and one end of resistor R24 ​​are connected to the flyback converter module. The other end of resistor R23 is connected to one end of the LED U4A of optocoupler U4 and one end of resistor R28. The other end of resistor R28 is connected to the other end of the LED U4A of optocoupler U4, one end of capacitor C28, and the output terminal of Zener diode U5. The other end of capacitor C28 is connected to one end of resistor R33, one end of resistor R34, one end of resistor R7, and the control terminal of Zener diode U5. The other end of resistor R34 is connected to the other end of resistor R24. One end of the photodetector U4B of optocoupler U4 is connected to the main control module. The other end of the photodetector U4B of optocoupler U4 is connected to the ground terminal. The other end of resistor R7 and the input terminal of Zener diode U5 are connected to the AGND terminal.

[0012] As one of the preferred embodiments of this utility model, an interleaved flyback audio switching power supply further includes an output filtering module connected between the flyback converter module and the power amplifier.

[0013] As one of the preferred embodiments of this utility model, the output filtering module includes capacitors EC6-EC8, inductor LF3, resistor R20, capacitor C9, and capacitor C21. One end of capacitor EC6, one end of capacitor EC7, and the third end of inductor LF3 are connected to the flyback converter module. The second end of inductor LF3 is connected to one end of capacitor EC8, one end of resistor R20, one end of capacitor C9, one end of capacitor C21, and one end of the power amplifier. The fourth end of inductor LF3, the other end of capacitor EC6, and the other end of capacitor EC7 are connected to the AGND terminal. The first end of inductor LF3, the other end of capacitor EC8, the other end of resistor R20, the other end of capacitor C9, the other end of capacitor C21, and the other end of the power amplifier are connected to the OGND terminal.

[0014] In one of the preferred embodiments of this utility model, two flyback converter modules are configured.

[0015] The beneficial effects of this utility model are as follows: An interleaved flyback audio switching power supply includes a power module, a main control module, a feedback module, and at least two flyback converter modules; the power module is connected to an AC power supply; the main control module is connected to the power module and has at least two PWM output terminals; at least two flyback converter modules are connected in parallel between the PWM output terminals and the power amplifier, and the flyback converter modules are connected to the power module; the feedback module is connected to both the flyback converter modules and the main control module; the main control module can output interleaved PWM signals to the flyback converter modules through the PWM output terminals, so that different flyback converter modules output alternately; by interleaving multiple flyback converter modules in parallel, the current is interleaved, thereby increasing power, improving power efficiency, reducing EMI, and reducing output ripple, meeting the needs of audio equipment in the 200W-500W power range. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a block diagram of an interleaved flyback acoustic switching power supply.

[0018] Figure 2 This is a schematic diagram of the first part of an interleaved flyback acoustic switching power supply.

[0019] Figure 3 This is a circuit diagram of the second part of an interleaved flyback acoustic switching power supply.

[0020] Figure 4 This is the circuit schematic diagram of the third part of an interleaved flyback acoustic switching power supply.

[0021] Figure 5 This is the circuit schematic diagram of the fourth part of an interleaved flyback acoustic switching power supply.

[0022] Figure 6 This is the circuit schematic diagram of the fifth part of an interleaved flyback acoustic switching power supply.

[0023] Figure 7 This is the circuit schematic of the feedback module;

[0024] Figure 8 This is the circuit schematic of the output filter module. Detailed Implementation

[0025] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0026] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0029] Reference Figures 1 to 8 An interleaved flyback acoustic switching power supply includes a power module 10, a main control module 20, a feedback module 30, and at least two flyback converter modules 40.

[0030] Power module 10 is connected to an AC power source;

[0031] The main control module 20 is connected to the power supply module 10 and has at least two PWM output terminals;

[0032] At least two flyback converter modules 40 are connected in parallel between the PWM output terminal and the power amplifier 50, and the flyback converter module 40 is connected to the power supply module 10.

[0033] The feedback module 30 is connected to the flyback converter module 40 and the main control module 20, respectively.

[0034] The main control module 20 can output interleaved PWM signals to the flyback converter module 40 through the PWM output terminal, so that different flyback converter modules 40 can output alternately.

[0035] In this utility model, ① power module 10: used to convert AC input voltage into DC voltage and provide a stable DC input to the subsequent power circuit. In some embodiments, power module 10 is used as a separate startup power supply 70, which enables the main control chip U1 of main control module 20 to start quickly; ② main control module 20 (PWM controller): used to generate a drive signal with a fixed frequency and adjustable pulse width to control the switching of each power switch in the interleaved flyback converter module 40, and to regulate the output voltage and current; ③ flyback converter module 40: at least two are provided. Each flyback converter module 40 includes a power switch, a high-frequency transformer, an output rectifier diode, and an output filter capacitor. The power switches of each flyback converter module 40 are controlled by the main control module 20. The switching actions of the power switches are interleaved to achieve interleaved current output and improve the efficiency of the transformer output; ④ feedback module 30: the main control module 20 also has a voltage feedback function, which can adjust the pulse width according to the change of output voltage fed back by the feedback module 30 to maintain the stability of the output voltage; ⑤ reference Figure 1 and Figure 8 In some embodiments, an output filter module 60 is also included, which is connected between the flyback converter module 40 and the power amplifier 50: for converting the high-frequency AC voltage output by the interleaved flyback converter module 40 into a smooth DC voltage for use by the audio equipment.

[0036] Reference Figure 1 and Figure 2 In the power module 10, CON1 is an AC110V-230V AC input socket. The total power supply VBUS is obtained through fuse F1, varistor VR1, thermistor RT1, differential mode inductor LF1, X capacitor CX1, common mode inductor LF2, and rectified by rectifier bridge BD1 and filtered by filter capacitor EC2. The startup power supply 70 includes diode D5, diode D6 and resistor R60. Diodes D5 and D6 form a half-wave rectifier circuit, and the voltage HV is obtained through resistor R60 and provided to the main control chip U1 as the startup power supply.

[0037] Reference Figure 1 , Figures 3-6Preferably, there are two flyback converter modules 40, namely flyback converter module 40A and flyback converter module 40B. Flyback converter module 40A includes a MOSFET Q4 and a transformer T1. The gate of MOSFET Q4 is connected to the first PWM output terminal (DRVA pin) of the main control module 20. The drain of MOSFET Q4 is connected to one end of the primary winding of transformer T1. The other end of the primary winding of transformer T1 is connected to the power supply module 10. The secondary winding of transformer T1 is connected to the power amplifier 50. The source of MOSFET Q4 is connected to the ground terminal. Flyback converter module 40B includes a MOSFET Q6 and a transformer T2. The gate of MOSFET Q6 is connected to the second PWM output terminal (DRVB pin) of the main control module 20. The drain of MOSFET Q6 is connected to one end of the primary winding of transformer T2. The other end of the primary winding of transformer T2 is connected to the power supply module 10. The secondary winding of transformer T2 is connected to the power amplifier 50. The source of MOSFET Q6 is connected to the ground terminal.

[0038] Specifically, after the main control chip U1 starts up, it first drives the flyback converter module 40A. The DRVA pin drives the MOSFET Q4 through resistor R65, and the transformer T1 starts up. The voltage is coupled to the secondary side through the coil of transformer T1, and then rectified by Schottky diode D11 to obtain the VOUT output voltage. Then it is filtered by the output filter module 60 to obtain a smooth DC power output. When powered on, only the flyback converter module 40A is activated. When the feedback module 30 detects that the power has increased and reached the set value, the main control chip U1 starts up. The flyback converter module 40B is activated by its transformer T2. At this time, the PWM outputs of the flyback converter module 40B and 40A are 180 degrees out of phase, interleaving their outputs. When the PWM of the flyback converter module 40A is high, the PWM of the flyback converter module 40B is low; when the PWM of the flyback converter module 40A is low, the PWM output of the flyback converter module 40B is high. This ensures the output remains consistently high, thereby improving efficiency, reducing ripple, lowering EMI noise, and doubling the output power.

[0039] Reference Figure 1 , 3 and Figure 7In some embodiments, the feedback module 30 includes an optocoupler U4, a Zener diode U5, a resistor R7, resistors R23-R24, resistors R33-R34, and a capacitor C28. One end of resistor R23 and one end of resistor R24 ​​are connected to the flyback converter module 40. The other end of resistor R23 is connected to one end of the LED U4A of optocoupler U4 and one end of resistor R28. The other end of resistor R28 is connected to the other end of the LED U4A of optocoupler U4, one end of capacitor C28, and the output terminal of Zener diode U5. The other end of capacitor C28 is connected via resistor R33 and resistor R34. One end of the resistor R7 is connected to the control terminal of the Zener diode U5. The other end of the resistor R34 is connected to the other end of the resistor R24. One end of the optocoupler U4 receiver U4B is connected to the main control module 20, and the other end of the optocoupler U4 receiver U4B is connected to the ground terminal. The other end of the resistor R7 and the input terminal of the Zener diode U5 are connected to the AGND terminal. The voltage and current output by the flyback converter module 40 are fed back to the main control module 10 through the optocoupler U4. The main control module 20 can adjust the pulse width according to the change of the output voltage fed back by the feedback module 30 to keep the output voltage stable.

[0040] Reference Figure 1 and Figure 8 In some embodiments, the output filtering module 60 includes capacitors EC6-EC8, inductor LF3, resistor R20, capacitor C9, and capacitor C21. One end of capacitor EC6, one end of capacitor EC7, and the third end of inductor LF3 are connected to flyback converter module 40. The second end of inductor LF3 is connected to one end of capacitor EC8, one end of resistor R20, one end of capacitor C9, one end of capacitor C21, and one end of power amplifier 50. The fourth end of inductor LF3, the other end of capacitor EC6, and the other end of capacitor EC7 are connected to AGND terminal. The first end of inductor LF3, the other end of capacitor EC8, the other end of resistor R20, the other end of capacitor C9, the other end of capacitor C21, and the other end of power amplifier 50 are connected to OGND terminal.

[0041] The advantages of this utility model are as follows: 1. Improved power supply efficiency: By interleaving multiple flyback converter modules 40 in parallel, the current is interleaved. When the power output is low, only one set of power transistors works. When the power increases, the second power transistor is activated, which effectively reduces the power consumption at low power and increases the peak and effective current values ​​of the converter, thereby improving the overall power supply efficiency; 2. Reduced EMI: The interleaved flyback converter modules 40 can disperse the electromagnetic interference generated by the switching action and use each other at the same frequency, reducing the EMI peak value generated by the superposition of stray currents and improving the electromagnetic compatibility of the power supply; 3. Reduced output ripple: Due to the interleaved current output, the charging and discharging of the output filter capacitor is more uniform, thereby effectively reducing the output ripple and improving the stability of the output voltage; 4. Enhanced reliability: The protection circuit design ensures the safe shutdown of the power supply under abnormal conditions, improving the reliability and stability of the power supply and meeting the requirements of audio equipment in the 200W-500W power range.

[0042] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. An interleaved flyback acoustic switching power supply, characterized in that: It includes a power supply module (10), a main control module (20), a feedback module (30), and at least two flyback converter modules (40); The power module (10) is connected to an AC power source; The main control module (20) is connected to the power supply module (10) and has at least two PWM output terminals; At least two of the flyback converter modules (40) are connected in parallel between the PWM output terminal and the power amplifier (50), and the flyback converter module (40) is connected to the power supply module (10); The feedback module (30) is connected to the flyback converter module (40) and the main control module (20) respectively; The main control module (20) can output interleaved PWM signals to the flyback converter module (40) through the PWM output terminal, so that different flyback converter modules (40) can output alternately.

2. The alternating flyback acoustic switching power supply according to claim 1, characterized in that: The flyback converter module (40) includes a MOSFET Q4 and a transformer T1. The gate of the MOSFET Q4 is connected to the first PWM output terminal of the main control module (20). The drain of the MOSFET Q4 is connected to one end of the primary winding of the transformer T1. The other end of the primary winding of the transformer T1 is connected to the power supply module (10). The secondary winding of the transformer T1 is connected to the power amplifier (50). The source of the MOSFET Q4 is connected to the ground terminal.

3. The alternating flyback acoustic switching power supply according to claim 1, characterized in that: The feedback module (30) includes an optocoupler U4, a Zener diode U5, a resistor R7, resistors R23-R24, resistors R33-R34, and a capacitor C28. One end of resistor R23 and one end of resistor R24 ​​are connected to the flyback converter module (40). The other end of resistor R23 is connected to one end of the optocoupler U4 emitter U4A and one end of resistor R28. The other end of resistor R28 is connected to the other end of the optocoupler U4 emitter U4A, one end of capacitor C28, and the output terminal of Zener diode U5. The other end of capacitor C28 is connected to one end of resistor R33, one end of resistor R34, one end of resistor R7, and the control terminal of Zener diode U5. The other end of resistor R34 is connected to the other end of resistor R24. One end of the optocoupler U4 receiver U4B is connected to the main control module (20). The other end of the optocoupler U4 receiver U4B is connected to the ground terminal. The other end of resistor R7 and the input terminal of Zener diode U5 are connected to the AGND terminal.

4. The alternating flyback acoustic switching power supply according to claim 1, characterized in that: It also includes an output filter module (60) that connects the flyback converter module (40) and the power amplifier (50).

5. The alternating flyback acoustic switching power supply according to claim 4, characterized in that: The output filtering module (60) includes capacitors EC6-EC8, inductor LF3, resistor R20, capacitor C9 and capacitor C21. One end of capacitor EC6, one end of capacitor EC7 and the third end of inductor LF3 are connected to the flyback converter module (40). The second end of inductor LF3 is connected to one end of capacitor EC8, one end of resistor R20, one end of capacitor C9, one end of capacitor C21 and one end of power amplifier (50). The fourth end of inductor LF3, the other end of capacitor EC6 and the other end of capacitor EC7 are connected to the AGND terminal. The first end of inductor LF3, the other end of capacitor EC8, the other end of resistor R20, the other end of capacitor C9, the other end of capacitor C21 and the other end of power amplifier (50) are connected to the OGND terminal.

6. The alternating flyback acoustic switching power supply according to claim 1, characterized in that: The flyback converter module (40) is configured to have two units.

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