Double-transistor flyback topology circuit structure of audio power supply module

Abstract

The utility model relates to the field of audio power supplies, in particular to a double-transistor flyback topology circuit structure of an audio power supply module, which is characterized by comprising a double-transistor flyback switching circuit and a voltage conversion circuit, and the output end of the double-transistor flyback switching circuit is electrically connected with the input end of the voltage conversion circuit. According to the utility model, the output power and efficiency are improved, the peak voltage and the peak current can be effectively controlled, the ripples at the output end can be reduced, and the circuit is especially suitable for equipment sensitive to the ripples.

Description

Technical Field

[0001] The utility model relates to the field of audio power supply, in particular to a double-tube flyback topology circuit structure of an audio power supply module. Background Art

[0002] Chinese patent application publication number CN117353591A discloses a technical solution entitled "A System and Method for Extending the Voltage Range of a Power Supply Dedicated to Audio Amplifiers." This solution includes the following technical features: an AC power module, an amplifier control module, a voltage control circuit, a main power control circuit, and an auxiliary power circuit. The main power control circuit comprises a first rectifier and filter circuit, a main power control module IC1, field-effect transistors Q1 and Q2, capacitors C1, C5, and C2; and a transformer T1. While this main power control circuit has a relatively simple structure, its output power is limited, its control over peak voltage and peak current is limited, and it exhibits significant output ripple, making it difficult to use on ripple-sensitive audio equipment. Therefore, it is crucial to design a dual-switch flyback topology circuit structure for an audio power module to address these technical issues. Utility Model Content

[0003] The purpose of the present utility model is to solve the above-mentioned problems and shortcomings and provide a dual-tube flyback topology circuit structure of an audio power module. The dual-tube flyback topology circuit structure of the audio power module not only improves the output power and efficiency, but also effectively controls the peak voltage and peak current, and reduces the ripple at the output end. It is particularly suitable for devices that are sensitive to ripple.

[0004] The technical solution of the present utility model is achieved as follows:

[0005] A dual-tube flyback topology circuit structure for an audio power module is characterized by comprising a dual-tube flyback switch circuit and a voltage conversion circuit, wherein the output end of the dual-tube flyback switch circuit is electrically connected to the input end of the voltage conversion circuit; the dual-tube flyback switch circuit includes two power tube parallel drive circuits, the output ends of the two power tube parallel drive circuits are respectively electrically connected to different input ends of the voltage conversion circuit, a first diode is connected in series between the two power tube parallel drive circuits, and a first capacitor is connected in series between the output ends of the two power tube parallel drive circuits.

[0006] Preferably, the power tube parallel drive circuit includes a second capacitor, two MOS tubes, and two limiter circuits. The two limiter circuits are connected in series between the gates of the two MOS tubes. The drain and source of one MOS tube are electrically connected to the drain and source of the other MOS tube, respectively, so that both MOS tubes are connected in parallel with the second capacitor using their drains and sources. A first resistor is connected in series between the gates and sources of both MOS tubes. The first diode is connected in series between the drains of the MOS tubes in the two power tube parallel drive circuits. The drain of the MOS tube in one power tube parallel drive circuit is electrically connected to the corresponding input terminal of the voltage conversion circuit, and the source of the MOS tube in the other power tube parallel drive circuit is electrically connected to the corresponding input terminal of the voltage conversion circuit.

[0007] Preferably, the amplitude limiting circuit includes a second diode, a second resistor, and a third resistor. The second diode and the second resistor are connected in series and then in parallel with the third resistor.

[0008] Preferably, the sources of the MOS tubes in the two power tube parallel driving circuits are both grounded, and a third diode is connected in series to the ground end of the MOS tube in one of the power tube parallel driving circuits.

[0009] Preferably, the voltage conversion circuit is a transformer.

[0010] The beneficial effects of this utility model include employing a dual-tube flyback switch circuit in the dual-tube flyback topology circuit structure, and electrically connecting the output of the dual-tube flyback switch circuit to the input of the voltage conversion circuit. This not only effectively increases output power and efficiency, but also effectively controls peak voltage and peak current, and reduces output ripple, making it particularly suitable for ripple-sensitive audio equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the circuit structure of the utility model. DETAILED DESCRIPTION

[0012] like Figure 1 As shown, the dual-tube flyback topology circuit structure of an audio power module described in the present invention includes a dual-tube flyback switch circuit 1 and a voltage conversion circuit 2, and the output end of the dual-tube flyback switch circuit 1 is electrically connected to the input end of the voltage conversion circuit 2.

[0013] This dual-switch flyback topology employs a dual-switch flyback switch circuit 1, with the output of the dual-switch flyback switch circuit 1 electrically connected to the input of a voltage conversion circuit 2. This not only effectively increases output power and efficiency, but also effectively controls peak voltage and current, and reduces output ripple, making it particularly suitable for ripple-sensitive audio equipment.

[0014] like Figure 1 As shown, the dual-tube flyback switch circuit 1 includes two parallel power tube drive circuits 11. The output terminals of the two parallel power tube drive circuits 11 are electrically connected to different input terminals of the voltage conversion circuit 2. A first diode 12 is connected in series between the two parallel power tube drive circuits 11. A first capacitor 13 is connected in series between the output terminals of the two parallel power tube drive circuits 11. This facilitates the formation of a stable and reliable dual-tube flyback switch circuit 1, thereby further improving the reliability and applicability of the dual-tube flyback topology circuit structure.

[0015] like Figure 1 As shown, the power tube parallel drive circuit 11 includes a second capacitor 111, two MOS tubes 112, and two limiter circuits 113. The two limiter circuits 113 are connected in series between the gates of the two MOS tubes 112. The drain and source of one MOS tube 112 are electrically connected to the drain and source of the other MOS tube 112, respectively. The two MOS tubes 112 are connected in parallel with the second capacitor 111 using their drains and sources. A first resistor 114 is connected in series between the gates and sources of the two MOS tubes 112. The first diode 12 is connected in series between the drains of the MOS tubes 112 in the two power tube parallel drive circuits 11. The drain of the MOS tube 112 in one power tube parallel drive circuit 11 is electrically connected to the corresponding input terminal of the voltage conversion circuit 2, and the source of the MOS tube 112 in the other power tube parallel drive circuit 11 is electrically connected to the corresponding input terminal of the voltage conversion circuit 2. This not only helps the power tube parallel drive circuit 11 have a simpler circuit structure, but also improves the working performance of the power tube parallel drive circuit 11, which can better increase power, better control peak voltage and peak current, and more effectively reduce output ripple, thereby further improving the reliability and applicability of the dual-tube flyback topology circuit structure.

[0016] like Figure 1 As shown, since the drain of the MOS tube 112 on one of the power tube parallel driving circuits 11 is electrically connected to the corresponding input end of the voltage conversion circuit 2, and the source of the MOS tube 112 on the other power tube parallel driving circuit 11 is electrically connected to the corresponding input end of the voltage conversion circuit 2; therefore, the first capacitor 13 is connected in series between the drain of the corresponding MOS tube 112 and the source of the corresponding MOS tube 112, which can meet the requirements of actual manufacturing and use.

[0017] like Figure 1As shown, the amplitude limiting circuit 113 includes a second diode 1131, a second resistor 1132, and a third resistor 1133. The second diode 1131 and the second resistor 1132 are connected in series and then in parallel with the third resistor 1133. Such an amplitude limiting circuit 113 is very simple and reliable. It is not only easy to manufacture, but also can reliably limit current and absorb reverse peak pulse current. It can better protect the previous stage circuit, thereby helping to further improve the reliability of the dual-switch flyback topology circuit structure.

[0018] like Figure 1 As shown, the sources of the MOS transistors 112 in the two parallel power transistor drive circuits 11 are both grounded, and a third diode 115 is connected in series with the ground terminal of the MOS transistor 112 in one of the parallel power transistor drive circuits 11. This can protect the circuit and reduce interference, thereby further improving the performance of the dual-transistor flyback topology circuit structure.

[0019] like Figure 1 As shown, the voltage conversion circuit 2 is a transformer. This not only facilitates the manufacture of the dual-switch flyback topology circuit structure, but also facilitates stable voltage transformation, thereby helping to further improve the applicability and stability of the dual-switch flyback topology circuit structure.

[0020] In actual use, the dual-tube flyback topology circuit structure is connected in series between the input filter and rectifier circuit and the output filter and rectifier circuit of the audio power module, and the dual-tube flyback topology circuit structure is connected to the relevant drive circuit of the audio power module. This can meet the needs of actual use, improve the output power and efficiency, control the peak voltage and peak current, and reduce the ripple at the output end. It is particularly suitable for devices that are sensitive to ripple.

Claims

1. A dual-switch flyback topology circuit structure for an audio power module, characterized by: The invention comprises a dual-tube flyback switch circuit (1) and a voltage conversion circuit (2), wherein the output end of the dual-tube flyback switch circuit (1) is electrically connected to the input end of the voltage conversion circuit (2); the dual-tube flyback switch circuit (1) comprises two power tube parallel drive circuits (11), the output ends of the two power tube parallel drive circuits (11) are electrically connected to different input ends of the voltage conversion circuit (2), a first diode (12) is connected in series between the two power tube parallel drive circuits (11), and a first capacitor (13) is connected in series between the output ends of the two power tube parallel drive circuits (11).

2. The dual-switch flyback topology circuit structure of the audio power module according to claim 1, characterized in that: The power tube parallel drive circuit (11) comprises a second capacitor (111), two MOS tubes (112), and two limiter circuits (113). The two limiter circuits (113) are connected in series between the gates of the two MOS tubes (112). The drain and source of one MOS tube (112) are electrically connected to the drain and source of the other MOS tube (112), respectively. The two MOS tubes (112) are connected in parallel with the second capacitor (111) using their drains and sources. The two MOS tubes (112) are connected in parallel with the second capacitor (111). A first resistor (114) is connected in series between the gate and source of each power tube parallel drive circuit (112); the first diode (12) is connected in series between the drains of the MOS tubes (112) on the two power tube parallel drive circuits (11), the drain of the MOS tube (112) on one power tube parallel drive circuit (11) is electrically connected to the corresponding input end of the voltage conversion circuit (2), and the source of the MOS tube (112) on the other power tube parallel drive circuit (11) is electrically connected to the corresponding input end of the voltage conversion circuit (2).

3. The dual-switch flyback topology circuit structure of the audio power module according to claim 2, characterized in that: The amplitude limiting circuit (113) comprises a second diode (1131), a second resistor (1132), and a third resistor (1133); the second diode (1131) and the second resistor (1132) are connected in series and then in parallel with the third resistor (1133).

4. The dual-switch flyback topology circuit structure of the audio power module according to claim 2, characterized in that: The sources of the MOS tubes (112) on the two power tube parallel drive circuits (11) are both grounded, and a third diode (115) is connected in series to the ground end of the MOS tube (112) on one of the power tube parallel drive circuits (11).

5. The dual-switch flyback topology circuit structure of the audio power module according to any one of claims 1 to 4, characterized in that: The voltage conversion circuit (2) is a transformer.

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