AHB asymmetric half-bridge control circuit

Abstract

The utility model discloses an AHB asymmetric half-bridge control circuit comprising a first drive circuit, a second drive circuit, a gallium nitride switching device Q4, a gallium nitride switching device Q6, a capacitor C17 and a transformer T1. The input end of the first driving circuit is connected with a control signal, and the output end of the first driving circuit is connected with the control end of the gallium nitride switching device Q4, the output end of the gallium nitride switching device Q4, the input end of the gallium nitride switching device Q6 and one end of an N1 winding of the transformer T1. The input end of the second driving circuit is connected with a control signal, and the output end of the second driving circuit is connected with the control end of the gallium nitride switching device Q6, the output end of the gallium nitride switching device Q6 and one end of the capacitor C17. The other end of the capacitor C17 is connected with the other end of the winding N1 of the transformer T1, and a secondary winding of the transformer T1 is connected to a load; by means of the circuit, accurate control over the output voltage and effective management over the current are achieved, the power supply conversion efficiency is improved, high-dynamic current output is improved, ripples and noise of the output voltage are remarkably reduced, and a pure power supply environment is provided for a high-power sound system.

Description

Technical Field

[0001] The utility model relates to the field of power amplifier switching power supplies, in particular to an AHB asymmetric half-bridge control circuit. Background Art

[0002] With the continuous development of audio technology, the requirements for audio power supplies are increasing. Traditional switching power supply solutions have shortcomings in efficiency, dynamics, noise control, and dynamic response, making it difficult to meet the needs of high-end audio systems with small size and high power. The asymmetric half-bridge topology has gradually become a new trend in audio power supply design due to its unique advantages, such as higher efficiency, lower switching losses, and good electromagnetic compatibility. However, high-power asymmetric half-bridge audio power supply systems based on AHB technology are still rare in the market and have disadvantages such as complex design and high cost. Therefore, an AHB asymmetric half-bridge control circuit is urgently needed to solve these problems. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention proposes an AHB asymmetric half-bridge control circuit.

[0004] An embodiment of the present invention solves the technical problem by adopting a technical solution: an AHB asymmetric half-bridge control circuit, comprising a first drive circuit, a second drive circuit, a gallium nitride switch device Q4, a gallium nitride switch device Q6, a capacitor C17, and a transformer T1;

[0005] The input end of the first driving circuit is connected to the control signal, and the output end is respectively connected to the control end of the gallium nitride switch device Q4, the output end of the gallium nitride switch device Q4, the input end of the gallium nitride switch device Q6, and one end of the N1 winding of the transformer T1;

[0006] The input end of the second driving circuit is connected to the control signal, and the output end is connected to the control end of the gallium nitride switch device Q6, the output end of the gallium nitride switch device Q6 and one end of the capacitor C17 respectively;

[0007] The other end of the capacitor C17 is connected to the other end of the N1 winding of the transformer T1 , and the secondary winding of the transformer T1 is connected to the load.

[0008] As one of the preferred embodiments of the present utility model, the first drive circuit includes a resistor R32, a resistor R65, a resistor R66 and a diode D8. One end of the resistor R32 is connected to the control signal, and the other end of the resistor R32 is respectively connected to one end of the resistor R65 and the cathode of the diode D8. The other end of the resistor R65 is respectively connected to the control end of the gallium nitride switching device Q4, the anode of the diode D8 and one end of the resistor R66. The other end of the resistor R66 is respectively connected to the output end of the gallium nitride switching device Q4, the input end of the gallium nitride switching device Q6 and one end of the N1 winding of the transformer T1.

[0009] As one of the preferred embodiments of the present utility model, the second drive circuit includes a resistor R22, a resistor R35, a resistor R67, a resistor R68, a resistor R71 and a diode D10, one end of the resistor R35 is connected to the control signal, the other end of the resistor R35 is respectively connected to one end of the resistor R67 and the cathode of the diode D10, the other end of the resistor R67 is respectively connected to the anode of the diode D10, one end of the resistor R68 and the control end of the gallium nitride switching device Q6, the other end of the resistor R68 is respectively connected to one end of the resistor R22, one end of the resistor R71, one end of the capacitor C17 and the output end of the gallium nitride switching device Q6, and the other end of the resistor R22 and the other end of the resistor R71 are grounded.

[0010] As one of the preferred embodiments of the present invention, an AHB asymmetric half-bridge control circuit also includes a power supply module, one end of the N3 winding of the transformer T1 is grounded, the input end of the power supply module is connected to the other end of the N3 winding of the transformer T1, and the output end is connected to the main control module for powering the main control module.

[0011] As one of the preferred embodiments of the present utility model, the power supply module includes a diode D13, a capacitor C4, a capacitor C10, a capacitor C48, a resistor R17, a voltage regulator ZD1 and a transistor Q3. The anode of the diode D13 is connected to the other end of the N3 winding of the transformer T1, and the cathode of the diode D13 is respectively connected to one end of the capacitor C10, one end of the capacitor C48, one end of the resistor R17 and the emitter of the transistor Q2. The other end of the resistor R17 is respectively connected to the base of the transistor Q2 and one end of the voltage regulator ZD1. The collector of the transistor Q2 is respectively connected to the main control module and one end of the capacitor C4. The other end of the capacitor C4, the other end of the capacitor C10, the other end of the capacitor C48 and the other end of the voltage regulator ZD1 are grounded.

[0012] The beneficial effects of the present invention include: an AHB asymmetric half-bridge control circuit, comprising a first drive circuit, a second drive circuit, a gallium nitride switch device Q4, a gallium nitride switch device Q6, a capacitor C17, and a transformer T1; the first drive circuit has an input terminal connected to a control signal, and an output terminal connected to the control terminal of the gallium nitride switch device Q4, the output terminal of the gallium nitride switch device Q4, the input terminal of the gallium nitride switch device Q6, and one end of the N1 winding of the transformer T1, respectively; the second drive circuit has an input terminal connected to a control signal, and an output terminal connected to the control terminal of the gallium nitride switch device Q6, the output terminal of the gallium nitride switch device Q6, and one end of the capacitor C17, respectively; the other end of the capacitor C17 is connected to the other end of the N1 winding of the transformer T1, and the secondary winding of the transformer T1 is connected to a load; the above circuit achieves precise control of the output voltage and effective management of the current, thereby improving power conversion efficiency and high dynamic current output, and significantly reducing output voltage ripple and noise, providing a pure power supply environment for high-power audio systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0014] Figure 1 This is a circuit schematic diagram of a high-power amplifier switching power supply;

[0015] Figure 2 This is the circuit schematic diagram of the input rectifier and filter module;

[0016] Figure 3 This is the circuit schematic diagram of the main control module;

[0017] Figure 4 This is the circuit schematic diagram of the PFC module;

[0018] Figure 5 The figure is a schematic diagram of an AHB asymmetric half-bridge control circuit;

[0019] Figure 6 This is the circuit schematic diagram of the synchronous rectification module;

[0020] Figure 7 This is the circuit schematic diagram of the output filter module;

[0021] Figure 8 This is the circuit schematic diagram of the feedback module;

[0022] Figure 9 This is the circuit schematic diagram of the power supply module. DETAILED DESCRIPTION

[0023] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0024] In the description of this utility model, "above," "below," and "within" are understood to be exclusive of the number indicated, while "above," "below," and "within" are understood to be inclusive of the number indicated. The use of "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, or implicitly specifying the number or order of the technical features indicated.

[0025] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0026] In this utility model, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection; internal communication between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of these terms in this utility model based on the specific content of the technical solution.

[0027] 1)Reference Figures 1 to 9The utility model provides an AHB asymmetric half-bridge control circuit for use in a high-power amplifier switching power supply. The high-power amplifier switching power supply preferably includes an AHB asymmetric half-bridge control circuit 100, an input rectifier and filter module 200, a main control module 300, a PFC module 400, a synchronous rectifier module 500, an output filter module 600, and a feedback module 700. The input end of the input rectifier and filter module 200 is connected to an external power supply; the PFC module 400 is respectively connected to the output end of the input rectifier and filter module 200, the input end of the AHB asymmetric half-bridge control circuit 100, and the main control module 300; and The synchronous rectifier module 500 is connected between the output end of the AHB asymmetric half-bridge control circuit 100 and the load; the feedback module 700 is connected between the output end of the synchronous rectifier module 500 and the main control module 300; the external power supply signal is transmitted to the PFC module 400 through the input rectifier and filter module 200 to convert the power supply signal into a high-frequency pulse signal; after voltage conversion by the AHB asymmetric half-bridge control circuit 100, the voltage signal is stabilized by the synchronous rectifier module 500; the main control module 300 controls the working state of the PFC module 400 according to the feedback signal of the feedback module 700 to achieve stable control of the output voltage.

[0028] 2)Reference Figure 1-Figure 2 The 100-240V voltage of the external power supply is input from CON 1, first passing through the fuse F1. When there is a short circuit or current increase in the subsequent circuit, it will melt and provide protection; the voltage passes through the fuse F1 and the filters LF4 and LF5 and the X capacitor CX1 to the rectifier bridge BD1, and after being filtered by the capacitor C23, a voltage of about 300V is obtained. The diode D1 and the resistor RT 1 first charges capacitor EC1 so that the power supply voltage on capacitor EC1 is about 300V; further, another path passes through diode D5, diode D6 and resistor R69 to pre-supply the main control chip U1 with startup voltage, allowing the main control chip U1 to start normally. When the main control chip U1 is working stably, the PFC module 400 is started. The PFC boost circuit composed of inductor L3, diode D1 and gallium nitride switch device Q1 boosts the voltage to VBUS voltage of 380-400V. The VBUS voltage supplies power to gallium nitride switch devices Q4 and gallium nitride switch devices Q6. Resistor R8 is the current limiting detection resistor of the PFC module 400. When the main control chip U1 detects that the voltage across resistor R8 exceeds the limit voltage, it will disconnect the drive of gallium nitride switch device Q1 to play a protective role.

[0029] 3)Reference Figure 1 and Figure 5The present invention provides an AHB asymmetric half-bridge control circuit including a first drive circuit 10, a second drive circuit 20, a gallium nitride switch device Q4, a gallium nitride switch device Q6, a capacitor C17, and a transformer T1. The first drive circuit 10 has an input terminal connected to a control signal, and an output terminal connected to the control terminal of the gallium nitride switch device Q4, the output terminal of the gallium nitride switch device Q4, the input terminal of the gallium nitride switch device Q6, and one end of the N1 winding of the transformer T1. The second drive circuit 20 has an input terminal connected to a control signal, and an output terminal connected to the control terminal of the gallium nitride switch device Q6, the output terminal of the gallium nitride switch device Q6, and one end of the capacitor C17. The other end of the capacitor C17 is connected to the other end of the N1 winding of the transformer T1, and the secondary winding of the transformer T1 is connected to a load.

[0030] Specifically, the gallium nitride switch device Q4 is the upper tube of the AHB asymmetric half-bridge control circuit, the gallium nitride switch device Q6 is the lower tube, and the intermediate drive transformer T1. The main control chip U1 is the driver chip of the AHB asymmetric half-bridge control circuit and the PFC module 400. Since the output voltage range of the power amplifier is relatively large, the voltage transformation range of the N3 winding of the transformer T1 is also relatively large, so BOOST is used to stabilize the voltage to ensure that the VCC voltage is stable at around 18V; the secondary of the transformer T1 adopts synchronous rectification. Since it is an asymmetric half-bridge architecture, only one set of rectification is required; refer to Figure 1 and Figure 7 The energy storage capacitor of the output filter module 600 is composed of multiple 2200uF capacitors connected in parallel. Since the power amplifier has a relatively large power, the current required by the power amplifier varies greatly, and the capacitor is frequently charged and discharged. By connecting multiple capacitors in parallel, the entire circuit will not stop working when a certain capacitor is damaged. The parallel connection of multiple capacitors can also prevent the generation of ripples when the power amplifier uses power dynamically. The resistor R71 is the current limiting protection resistor of the AHB asymmetric half-bridge control circuit, which is used to protect the safety of the AHB asymmetric half-bridge control circuit.

[0031] In some embodiments, the first driving circuit 10 includes a resistor R32, a resistor R65, a resistor R66, and a diode D8. One end of the resistor R32 is connected to the control signal, and the other end of the resistor R32 is respectively connected to one end of the resistor R65 and the cathode of the diode D8. The other end of the resistor R65 is respectively connected to the control end of the gallium nitride switch device Q4, the anode of the diode D8, and one end of the resistor R66. The other end of the resistor R66 is respectively connected to the output end of the gallium nitride switch device Q4, the input end of the gallium nitride switch device Q6, and one end of the N1 winding of the transformer T1.

[0032] In some embodiments, the second driving circuit 20 includes a resistor R22, a resistor R35, a resistor R67, a resistor R68, a resistor R71, and a diode D10. One end of the resistor R35 is connected to the control signal, and the other end of the resistor R35 is respectively connected to one end of the resistor R67 and the cathode of the diode D10. The other end of the resistor R67 is respectively connected to the anode of the diode D10, one end of the resistor R68, and the control end of the gallium nitride switching device Q6. The other end of the resistor R68 is respectively connected to one end of the resistor R22, one end of the resistor R71, one end of the capacitor C17, and the output end of the gallium nitride switching device Q6. The other end of the resistor R22 and the other end of the resistor R71 are grounded.

[0033] 4)Reference Figure 1 and Figure 8 In some embodiments, the feedback module 700 includes a resistor R24, a resistor R34, a resistor R7, an optocoupler U4, and a comparator U5, etc., which are used to control the stability of the voltage; the default voltage is a relatively low voltage, such as about 10V. When the power amplifier needs a larger power, the power amplifier will output a corresponding PWM signal transmitted through CON3, and after being shaped by the resistors R14 and C3, the input of the comparator U5 is controlled. At this time, the output voltage of the power supply is increased accordingly to meet the power requirements of the power amplifier; according to the output power calculation formula of the power amplifier: P = U2 / R, when the load of the power amplifier remains unchanged, the output power will change with the power supply The higher the supply voltage, the greater the output power, and the lower the supply voltage, the smaller the output power. When the output voltage of the switching power supply changes, the supply voltage of the main control chip U1 will also change with the output voltage difference. In order to stabilize the voltage of the main control chip U1, it is necessary to adopt a voltage stabilization method to power the main control chip U1. The specific voltage stabilization method is as follows: After the main control chip U1 is started, the auxiliary winding N3 of the transformer T1 is rectified by the diode D13 to obtain a voltage of about 10-15V. After passing through the inductor L1, the voltage enters the 8th pin of the main control chip U1 for BOOST, and outputs a stable 18V voltage to power the main control chip U1.

[0034] 5) The advantages of the present invention are that the above-mentioned circuit realizes precise control of output voltage and effective management of current, which not only improves power conversion efficiency and high dynamic current output, but also significantly reduces output voltage ripple and noise, providing a pure power supply environment for high-power audio systems.

[0035] Reference Figure 1 and Figure 9In some embodiments, an AHB asymmetric half-bridge control circuit further includes a power supply module 30, one end of the N3 winding of the transformer T1 is grounded, the input end of the power supply module 30 is connected to the other end of the N3 winding of the transformer T1, and the output end is connected to the main control module for supplying power to the main control module; as a preferred embodiment of the power supply module 30, the power supply module 30 includes a diode D13, a capacitor C4, a capacitor C10, a capacitor C48, a resistor R17, a voltage regulator diode ZD1 and a transistor Q3, the anode of the diode D13 The cathode of the diode D13 is connected to one end of the capacitor C10, one end of the capacitor C48, one end of the resistor R17, and the emitter of the transistor Q2 respectively. The other end of the resistor R17 is connected to the base of the transistor Q2 and one end of the voltage-stabilizing diode ZD1 respectively. The collector of the transistor Q2 is connected to the main control module and one end of the capacitor C4 respectively. The other end of the capacitor C4, the other end of the capacitor C10, the other end of the capacitor C48, and the other end of the voltage-stabilizing diode ZD1 are grounded.

[0036] Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. An AHB asymmetric half-bridge control circuit, characterized in that: It includes a first drive circuit (10), a second drive circuit (20), a gallium nitride switch device Q4, a gallium nitride switch device Q6, a capacitor C17, and a transformer T1; The input end of the first drive circuit (10) is connected to a control signal, and the output end is respectively connected to the control end of the gallium nitride switch device Q4, the output end of the gallium nitride switch device Q4, the input end of the gallium nitride switch device Q6, and one end of the N1 winding of the transformer T1; The input end of the second driving circuit (20) is connected to the control signal, and the output end is respectively connected to the control end of the gallium nitride switch device Q6, the output end of the gallium nitride switch device Q6 and one end of the capacitor C17; The other end of the capacitor C17 is connected to the other end of the N1 winding of the transformer T1 , and the secondary winding of the transformer T1 is connected to the load.

2. The AHB asymmetric half-bridge control circuit according to claim 1, characterized in that: The first driving circuit (10) comprises a resistor R32, a resistor R65, a resistor R66 and a diode D8, one end of the resistor R32 is connected to a control signal, the other end of the resistor R32 is respectively connected to one end of the resistor R65 and the cathode of the diode D8, the other end of the resistor R65 is respectively connected to the control end of the gallium nitride switch device Q4, the anode of the diode D8 and one end of the resistor R66, and the other end of the resistor R66 is respectively connected to the output end of the gallium nitride switch device Q4, the input end of the gallium nitride switch device Q6 and one end of the N1 winding of the transformer T1.

3. The AHB asymmetric half-bridge control circuit according to claim 1, characterized in that: The second driving circuit (20) comprises a resistor R22, a resistor R35, a resistor R67, a resistor R68, a resistor R71 and a diode D10, one end of the resistor R35 is connected to a control signal, the other end of the resistor R35 is connected to one end of the resistor R67 and the cathode of the diode D10 respectively, the other end of the resistor R67 is connected to the anode of the diode D10, one end of the resistor R68 and the control end of the gallium nitride switch device Q6 respectively, the other end of the resistor R68 is connected to one end of the resistor R22, one end of the resistor R71, one end of the capacitor C17 and the output end of the gallium nitride switch device Q6 respectively, and the other end of the resistor R22 and the other end of the resistor R71 are grounded.

4. The AHB asymmetric half-bridge control circuit according to claim 1, characterized in that: It also includes a power supply module (30), one end of the N3 winding of the transformer T1 is grounded, the input end of the power supply module (30) is connected to the other end of the N3 winding of the transformer T1, and the output end is connected to the main control module, for supplying power to the main control module.

5. The AHB asymmetric half-bridge control circuit according to claim 4, characterized in that: The power supply module (30) comprises a diode D13, a capacitor C4, a capacitor C10, a capacitor C48, a resistor R17, a voltage-stabilizing diode ZD1, and a transistor Q3. The anode of the diode D13 is connected to the other end of the N3 winding of the transformer T1. The cathode of the diode D13 is respectively connected to one end of the capacitor C10, one end of the capacitor C48, one end of the resistor R17, and the emitter of the transistor Q2. The other end of the resistor R17 is respectively connected to the base of the transistor Q2 and one end of the voltage-stabilizing diode ZD1. The collector of the transistor Q2 is respectively connected to the main control module and one end of the capacitor C4. The other end of the capacitor C4, the other end of the capacitor C10, the other end of the capacitor C48, and the other end of the voltage-stabilizing diode ZD1 are grounded.

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