Floating power supply circuit, switch driving circuit and amplifier

Abstract

The invention provides a floating power supply circuit, a switch driving circuit and an amplifier, relates to the technical field of power amplifiers, and discloses the floating power supply circuit which is characterized in that in a first working stage, a first power supply circuit stores electric energy output by a first power supply, and a second power supply circuit outputs the stored electric energy to a second power supply input end of a driving circuit; and in the second working stage, the first power supply circuit outputs the stored electric energy to the first power supply input end of the driving circuit, and the second power supply circuit stores the electric energy output by the second power supply. According to the invention, the first power supply or the second power supply is provided for the driving circuit, so that the first switch tube or the second switch tube is switched on, the output of floating voltages of different reference grounds is realized, and the interference between power amplifier channels is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of power amplifiers, and in particular to a floating power supply circuit, a switch driving circuit and an amplifier. Background Art

[0002] Because existing dual-channel digital amplifiers share the same power supply, mutual interference between the two channels is inevitable, resulting in poor isolation between the amplifier channels. Summary of the invention

[0003] The main purpose of the present invention is to provide a floating power supply circuit, aiming to improve the isolation of channels of a power amplifier and reduce interference between channels of the power amplifier.

[0004] To achieve the above object, the present invention provides a floating power supply circuit, which is applied to a switch driving circuit, wherein the switch driving circuit includes a first switch tube and a second switch tube connected in series, and a driving circuit that drives the first switch tube and the second switch tube to work respectively, and the circuit includes:

[0005] A first power supply circuit, wherein an input end of the first power supply circuit is connected to a first power supply, and an output end of the first power supply circuit is connected to a first power supply end of the driving circuit;

[0006] A second power supply circuit, wherein the input end of the second power supply circuit is connected to a second power supply, and the output end of the second power supply circuit is connected to a second power supply end of the driving circuit; wherein

[0007] In the same operation cycle, the floating power supply circuit has two working stages;

[0008] In a first working stage, the first power supply circuit stores the electric energy output by the first power supply, and the second power supply circuit outputs the stored electric energy to the second power supply input terminal of the drive circuit, so that the drive circuit drives the first switch tube to turn off and the second switch tube to turn on;

[0009] In the second working stage, the first power supply circuit outputs the stored electric energy to the first power input terminal of the driving circuit, and the second power supply circuit stores the electric energy output by the second power supply, so that the driving circuit drives the first switch tube to turn on and the second switch tube to turn off.

[0010] Optionally, the first power supply circuit includes:

[0011] a first charging circuit, wherein an input end of the first charging circuit is connected to a first power source;

[0012] a first discharge circuit, wherein an input end of the first discharge circuit is connected to a first output end of the first charging circuit;

[0013] The first charging circuit is used to store the electric energy output by the first power supply in a first working stage;

[0014] In the second working stage, the first power supply circuit has two working cycles;

[0015] In a first working cycle, the first charging circuit outputs the stored electric energy to the first power input terminal of the driving circuit, and outputs the electric energy to the first discharging circuit for storage;

[0016] In a second working cycle, the first discharge circuit outputs the stored electric energy to the first power input terminal of the drive circuit.

[0017] Optionally, the first charging circuit includes:

[0018] A first capacitor, wherein a first end of the first capacitor is used to connect to a first power source;

[0019] a first diode, wherein an anode of the first diode is connected to a second end of the first capacitor;

[0020] A second capacitor, wherein a first end of the second capacitor is connected to the cathode of the first diode, and a second end of the second capacitor is connected to the second conduction end of the first switch tube.

[0021] Optionally, the first discharge circuit includes:

[0022] A first inductor, wherein a first end of the first inductor is connected to a second end of the first capacitor, a first end of the first inductor is connected to an anode of the first diode, and a second end of the first inductor is connected to a second end of the second capacitor.

[0023] Optionally, the second power supply circuit includes:

[0024] a second charging circuit, wherein an input end of the second charging circuit is connected to a second power source;

[0025] a second discharge circuit, wherein an input end of the second discharge circuit is connected to a first output end of the second charging circuit;

[0026] In the first working stage, the first power supply circuit has two working cycles;

[0027] In a first working cycle, the second charging circuit outputs the stored electric energy to the second power input terminal of the driving circuit, and outputs the electric energy to the second discharging circuit for storage;

[0028] In a second working cycle, the second discharge circuit outputs the stored electric energy to the second power input terminal of the drive circuit;

[0029] The second charging circuit is used to store the electric energy output by the second power supply in the second working stage.

[0030] Optionally, the second charging circuit includes:

[0031] A third capacitor, a first end of the third capacitor is used to connect to a second power supply;

[0032] a second diode, wherein an anode of the second diode is connected to a second end of the third capacitor;

[0033] a fourth capacitor, wherein a first end of the fourth capacitor is connected to the cathode of the second diode, and a second end of the fourth capacitor is connected to the second conducting end of the second switch tube;

[0034] Optionally, the second discharge circuit includes:

[0035] A second inductor, wherein a first end of the second inductor is connected to a second end of the third capacitor, a first end of the second inductor is connected to an anode of the second diode, and a second end of the second inductor is connected to a second end of the fourth capacitor.

[0036] Optionally, it also includes:

[0037] A voltage stabilizing circuit, wherein the voltage stabilizing circuit is electrically connected to the first power supply circuit and the second power supply circuit respectively; the voltage stabilizing circuit is used to stabilize the output voltage of the first power supply circuit and the output voltage of the second power supply circuit.

[0038] In addition, to achieve the above-mentioned purpose, the present invention further provides a switch driving circuit, the switch driving circuit comprising a first switch tube and a second switch tube arranged in series; and

[0039] The floating power supply circuit as described above, wherein:

[0040] The first power supply terminal of the driving circuit is connected to the power supply terminal of the first power supply circuit, the second power supply terminal of the driving circuit is connected to the power supply terminal of the second power supply circuit, the first output terminal of the driving circuit is connected to the first controlled terminal of the switching circuit, and the second output terminal of the driving circuit is connected to the second controlled terminal of the switching circuit.

[0041] In addition, to achieve the above object, the present invention also provides an amplifier, comprising the floating power supply circuit as described above;

[0042] And / or, including the switch driving circuit as described above.

[0043] In the embodiment of the present invention, the input end of the first power supply circuit is connected to the first power supply, the output end of the first power supply circuit is connected to the first power supply end of the driving circuit, the input end of the second power supply circuit is connected to the second power supply end of the driving circuit, and the output end of the second power supply circuit is connected to the second power supply end of the driving circuit, and the floating power supply circuit is divided into two working stages within one operation cycle; so that the first power supply circuit and the second power supply circuit respectively provide the first power supply or the second power supply to the driving circuit, so that one of the first switch tube or the second switch tube is turned on and the other is turned off, so as to realize the output of floating voltages with different reference grounds, so as to improve the isolation of the channels of the power amplifier, reduce the interference between the channels of the power amplifier, and use discrete passive devices to realize the first power supply circuit and the second power supply circuit, which has a simple structure, is easy to use, and has a low cost. In addition, the floating power supply circuit provided by the embodiment of the present invention is a power supply circuit of one channel, so that each channel independently designs a driving power supply, effectively avoiding the situation where multiple channels share the same driving power supply, and can better reduce the interference between the channels of the power amplifier, and improve the isolation of the channels of the power amplifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0046] Figure 1 is a structural block diagram of a floating power supply circuit according to an embodiment of the present invention;

[0047] Figure 2 is a structural block diagram of a floating power supply circuit according to another embodiment of the present invention;

[0048] Figure 3 A structural block diagram of a floating power supply circuit according to another embodiment of the present invention;

[0049] Figure 4 A structural block diagram of a floating power supply circuit according to another embodiment of the present invention;

[0050] Figure 5 It is a schematic diagram of the principle of a floating power supply circuit according to an embodiment of the present invention;

[0051] Figure 6 for Figure 1 A working waveform diagram of the first power supply circuit in;

[0052] Figure 7 for Figure 1 Working waveform diagram of the second power supply circuit in .

[0053] Description of Figure Numbers:

[0054] Label name Label name 100 First power supply circuit 220 Second discharge circuit 110 First charging circuit 300 Drive circuit 120 First discharge circuit 400 The first switch 200 Second power supply circuit 500 The second switch 210 Second charging circuit 600 Voltage stabilization circuit

[0055] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, and the well-known modules, units and their connections, links, communications or operations are not shown or described in detail. In addition, the described features, architectures or functions can be combined in any way in one or more embodiments. It should be understood by those skilled in the art that the various embodiments described below are only for illustration and not for limiting the scope of protection of the present invention. It can also be easily understood that the modules or units or processing methods in the various embodiments described herein and shown in the drawings can be combined and designed according to various different configurations. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0057] The limitations of various nouns or methods referred to in the following embodiments, except for those that are logically untenable, are generally based on the broad concepts that can be implemented under the premise of the disclosure in the embodiments. Under such understanding, the various specific subordinate specific limitations of the nouns or methods should be regarded as the inventive content of the present invention, and should not be understood narrowly or interpreted in a biased manner on the grounds that the specification does not disclose the specific limitations. Similarly, under the premise that it can be implemented logically, the order of the steps in the method is flexible and changeable, and the specific subordinate specific limitations in the broad concepts of various nouns or methods all fall within the scope of protection of the present invention.

[0058] The main solution of the embodiment of the present application is: by adopting the input end of the first power supply circuit to be connected to the first power supply, the output end of the first power supply circuit is connected to the first power supply end of the driving circuit, the input end of the second power supply circuit is connected to the second power supply end of the driving circuit, and the output end of the second power supply circuit is connected to the second power supply end of the driving circuit, and the floating power supply circuit is divided into two working stages within one operation cycle; so that the first power supply circuit and the second power supply circuit respectively provide the first power supply or the second power supply to the driving circuit, so that one of the first switch tube or the second switch tube is turned on, and the other is turned off.

[0059] Since the dual-channel digital power amplifiers in the prior art all share the same power supply drive, mutual interference between the two channels is inevitable, resulting in poor isolation between the power amplifier channels.

[0060] The present application provides a solution to achieve the output of floating voltages with different reference grounds, so as to improve the isolation of power amplifier channels and reduce interference between power amplifier channels.

[0061] Reference Figure 1 , Figure 6 as well as Figure 7 In one embodiment of the present invention, a floating power supply circuit is applied to a switch driving circuit 300. The switch driving circuit 300 includes a first switch tube 400 and a second switch tube 500 connected in series, and a driving circuit 300 for driving the first switch tube 400 and the second switch tube 500 to work respectively. The floating power supply circuit includes a first power supply circuit 100 and a second power supply circuit 200, wherein:

[0062] The input end of the first power supply circuit 100 is connected to the first power supply, and the output end of the first power supply circuit 100 is connected to the first power supply end of the driving circuit 300; the input end of the second power supply circuit 200 is connected to the second power supply end of the driving circuit 300; wherein,

[0063] In the same operation cycle, the floating power supply circuit has two working stages;

[0064] In the first working stage A1, the first power supply circuit 100 stores the electric energy output by the first power supply, and the second power supply circuit 200 outputs the stored electric energy to the second power supply input terminal of the driving circuit 300, so that the driving circuit 300 drives the first switch tube 400 to turn off and the second switch tube 500 to turn on;

[0065] In the second working stage A2, the first power supply circuit 100 outputs the stored electric energy to the first power input terminal of the driving circuit 300, and the second power supply circuit 200 stores the electric energy output by the second power supply, so that the driving circuit 300 drives the first switch tube 400 to turn on and the second switch tube 500 to turn off.

[0066] In this embodiment, the first power supply circuit 100 is used to store electric energy in the first working stage A1, and release electric energy in the second working stage A2 to supply power to the first power input terminal of the driving circuit 300, thereby driving the first switch tube 400; while the second power supply circuit 200 is the opposite, discharging when the first power supply circuit 100 stores electric energy, and storing energy when the first power supply circuit 100 discharges, so as to achieve alternating conduction of the first switch tube 400 and the second switch tube 500. This alternating working mode not only ensures the correct driving of the first switch tube 400 and the second switch tube 500, but also, in this embodiment, by connecting the first power input terminal and the second power input terminal of the driving circuit 300 to the first power supply and the second power supply respectively, it is achieved that under different power output conditions, the driving circuit 300 drives the first switch tube 400 or the second switch tube 500 to conduct, thereby achieving floating voltage output with different reference grounds. Since the first switch tube 400 conducts a voltage of +65V and the second switch tube 500 conducts a voltage of -65V, the voltages thereof are floating relative to the reference ground. In addition, in this embodiment, the first power supply circuit 100 and the second power supply circuit 200 are operated in time-sharing manner to realize an asynchronous charging and discharging process. When the first power supply circuit 100 is charged, the second power supply circuit 200 is discharged, and when the second power supply circuit 200 is charged, the first power supply circuit 100 is discharged. This design significantly improves the isolation of the power amplifier channel relative to other channels and effectively reduces the mutual interference between two channels in the multi-channel power amplifier circuit.

[0067] In this embodiment, both the first power supply circuit 100 and the second power supply circuit 200 are provided with energy storage capacitors to store electric energy, and inductors are provided to re-store energy when the energy storage capacitors are discharged, so as to perform secondary discharge. This design method can not only better realize the energy supply to the first power supply circuit 100 or the second power supply circuit 200, but also avoid the situation where the capacitors discharge too quickly, resulting in insufficient power supply. At the same time, through the secondary energy storage and discharge of the inductors, the efficiency of electric energy utilization can be further improved and the power loss can be reduced.

[0068] In this embodiment, the input end of the first power supply circuit 100 is connected to the first power supply, the output end of the first power supply circuit 100 is connected to the first power supply end of the driving circuit 300, the input end of the second power supply circuit 200 is connected to the second power supply end of the driving circuit 300, and the output end of the second power supply circuit 200 is connected to the second power supply end of the driving circuit 300, and the floating power supply circuit is divided into two working stages within a time period; so that the first power supply circuit 100 and the second power supply circuit 200 respectively provide the first power supply to the driving circuit 300 in the first working stage or provide the second power supply to the driving circuit 300 in the second working stage, so that one of the first switch tube 400 or the second switch tube 500 is turned on and the other is turned off, so as to realize the output of floating voltages with different reference grounds, so as to improve the isolation of the channels of the power amplifier and reduce the interference between the channels of the power amplifier. In addition, discrete passive components are used to realize the first power supply circuit 100 and the second power supply circuit 200, which has a simple structure, is easy to use, and has a low cost. In addition, the floating power supply circuit provided in the embodiment of the present invention is a power supply circuit for one channel, so that each channel can independently design a driving power supply, effectively avoiding the situation where multiple channels share the same driving power supply, which can better reduce interference between power amplifier channels and improve the isolation of the power amplifier channels.

[0069] Reference Figure 2 as well as Figure 6 Another embodiment of the present invention provides a floating power supply circuit, based on the above Figure 1 In the illustrated embodiment, the first power supply circuit 100 includes a first charging circuit 110 and a first discharging circuit 120, wherein:

[0070] The input end of the first charging circuit 110 is connected to the first power supply; the input end of the first discharging circuit 120 is connected to the first output end of the first charging circuit 110;

[0071] The first charging circuit 110 is used to store the electric energy output by the first power supply in the first working stage A1;

[0072] In the second working stage A2, the first power supply circuit 100 has two working cycles;

[0073] In the first working cycle T2, the first charging circuit 110 outputs the stored electric energy to the first power input terminal of the driving circuit 300, and outputs the electric energy to the first discharging circuit 120 for storage;

[0074] In the second working cycle T3 , the first discharge circuit 120 outputs the stored electric energy to the first power input terminal of the driving circuit 300 .

[0075] In this embodiment, the first charging circuit 110 can use energy storage elements such as capacitors to store electric energy. When the first power supply circuit 100 is in the first working stage A1, the first charging circuit 110 starts charging to store the electric energy output by the first power supply. When entering the second working stage A2, the first power supply circuit 100 will be divided into two different working cycles. In the first working cycle, the first charging circuit 110 performs a discharge and releases the stored electric energy to the first power input terminal of the drive circuit 300 to drive the first switch tube 400 to turn on. And part of the stored electric energy is released to energy storage elements such as inductors to supply energy in the second working cycle T3. In the second working cycle T3, the first charging circuit 110 stops discharging, and the first discharge circuit 120 performs a second discharge at this time, and continues to provide electric energy to the drive circuit 300 to ensure the continuous conduction state of the first switch tube 400.

[0076] The design of the first discharge circuit 120 can be adjusted according to the specific application scenario and power requirements. It can be implemented by using energy storage elements similar to the first charging circuit 110, such as using capacitors for energy storage. In the second working cycle T3 of the second working stage A2, the discharge of the first charging circuit 110 is completed, and the first discharge circuit 120 starts to discharge, and continues to provide power to the drive circuit 300 to ensure the stable operation of the first switch tube 400. Among them, the first discharge circuit 120 can be implemented by circuits such as inductance or a series combination of inductance and capacitance. Through the self-inductance of the inductor, it can store energy again when the capacitor is discharged, and release the energy after the capacitor is discharged for secondary discharge. This design method can not only make full use of electrical energy and improve the efficiency of electrical energy utilization, but also ensure that when the first switch tube 400 needs to be continuously turned on, there is sufficient electrical energy supply, avoiding the situation of unstable or failed driving due to insufficient electrical energy, and realizing effective driving of the first switch tube 400.

[0077] Reference Figure 5 and Figure 6 Another embodiment of the present invention provides a floating power supply circuit, based on the above Figure 2 In the illustrated embodiment, the first charging circuit 110 includes a first capacitor C12, a first diode D3, and a second capacitor C26, wherein:

[0078] The first end of the first capacitor C12 is used to connect to the first power supply; the positive electrode of the first diode D3 is connected to the second end of the first capacitor C12; the first end of the second capacitor C26 is connected to the negative electrode of the first diode D3, and the second end of the second capacitor C26 is connected to the second conduction end of the first switch tube 400.

[0079] In this embodiment, the first capacitor C12 and the second capacitor C26 together constitute the main energy storage element of the first charging circuit 110. In the first working stage A1, the first power source is charged through the positive electrode of the first capacitor C12, and the electric energy is stored in the first capacitor C12. At the same time, due to the unidirectional conductivity of the first diode D3, it prevents the current from flowing from the second capacitor C26 to the first capacitor C12, ensuring the unidirectionality of the charging process.

[0080] In the first working cycle T2 of the second working stage A2, when the first power supply circuit 100 needs to output the stored electric energy to the first power input terminal of the driving circuit 300, the first capacitor C12 and the second capacitor C26 begin to discharge. The electric energy in the first capacitor C12 and the second capacitor C26 is gradually released to provide the required electric energy for the driving circuit 300.

[0081] In the second working cycle T3 of the second working stage A2, when the electric energy of the first capacitor C12 is basically exhausted and can no longer provide sufficient electric energy for the driving circuit 300, the first discharge circuit 120 starts to work. It can release the electric energy stored in the inductor or other energy storage elements to the driving circuit 300 to maintain the on state of the first switch tube 400. This design ensures that the first switch tube 400 can obtain a stable supply of electric energy throughout the working cycle, thereby achieving effective driving of the first switch tube 400 and improving the utilization efficiency of electric energy.

[0082] In addition, the capacity and withstand voltage of the first capacitor C12 and the second capacitor C26 can be adjusted according to the requirements of the actual application. For example, in applications requiring higher output power, a capacitor with a larger capacity can be selected to improve the power storage capacity; and in applications requiring higher voltage, a capacitor with a higher withstand voltage value needs to be selected to ensure the safety of the circuit.

[0083] Reference Figure 5 Another embodiment of the present invention provides a floating power supply circuit based on the above Figure 2 In the illustrated embodiment, the first discharge circuit 120 comprises a first inductor L1, wherein:

[0084] The first end of the first inductor L1 is connected to the second end of the first capacitor C12 , the first end of the first inductor L1 is connected to the anode of the first diode D3 , and the second end of the first inductor L1 is connected to the second end of the second capacitor C26 .

[0085] In this embodiment, the first inductor L1 is used as a core component of the first discharge circuit 120, and is designed to continue to provide stable power to the drive circuit 300 after the first charging circuit 110 has completed discharging. In the first working period T2 of the first working stage A1 and the second working stage A2, the first inductor L1, as a part of the circuit, is in a standby state, but its internal magnetic flux accumulates as the current changes.

[0086] Entering the second working cycle T3 of the second working stage A2, the discharge of the first capacitor C12 is basically completed, and the first inductor L1 begins to play its role of energy storage. Since the inductor has the characteristic of hindering the change of current, after the discharge of the first capacitor C12 is completed, the current in the first inductor L1 will not disappear immediately, but will continue for a period of time, and in this process, the magnetic energy will be converted into electrical energy, and its first end will output the stored electrical energy to the second capacitor C26 and the drive circuit 300 through the first diode D3, ensuring the stable conduction of the first switch tube 400. It makes full use of the energy storage characteristics of the inductor, and also realizes the continuous supply of electrical energy through reasonable circuit design, avoiding the problem of unstable driving or failure caused by insufficient electrical energy. At the same time, as a passive device, the first inductor L1 does not require additional control signals, reducing the complexity and cost of the circuit.

[0087] In addition, the selection of the first inductor L1 also needs to be made according to the specific application scenario. In applications that require higher output current, an inductor with lower internal resistance and higher saturation current can be selected to ensure efficient transmission and utilization of electrical energy; in applications that need to withstand higher voltages, an inductor with a higher withstand voltage value needs to be selected to ensure circuit safety.

[0088] Reference Figure 3 as well as Figure 7 Another embodiment of the present invention provides a floating power supply circuit based on the above Figure 1 In the illustrated embodiment, the second power supply circuit 200 includes a second charging circuit 210 and a second discharging circuit 220, wherein:

[0089] The input end of the second charging circuit 210 is connected to the second power supply; the input end of the second discharging circuit 220 is connected to the first output end of the second charging circuit 210;

[0090] In the first working phase A1, the first power supply circuit 200 has two working cycles;

[0091] In the first working cycle T1, the second charging circuit 210 outputs the stored electric energy to the second power input terminal of the driving circuit 300, and outputs the electric energy to the second discharging circuit 220 for storage;

[0092] In the second working cycle T2, the second discharge circuit 220 outputs the stored electric energy to the second power input terminal of the driving circuit 300;

[0093] The second charging circuit 210 is used to store the electric energy output by the second power supply in the second working stage A2.

[0094] In this embodiment, the second power supply circuit 200 provides stable power to the second power input terminal of the driving circuit 300 through the second charging circuit 210 and the second discharging circuit 220 therein. This design not only ensures that the driving circuit 300 can obtain sufficient power supply in different working stages, but also improves the utilization efficiency of power and reduces the complexity of the circuit.

[0095] Among them, in the second power supply circuit 200, the second charging circuit 210 stores the electric energy output by the second power supply in the third working stage A2. This storage process is realized by specific energy storage elements (such as capacitors or inductors, etc.), which can store electric energy when the electric energy is sufficient and release the electric energy when needed. In the second working stage A2, the second discharge circuit 220 starts to work and releases the electric energy stored in the second charging circuit 210 to the second power input terminal of the drive circuit 300 to ensure the stable operation of the drive circuit 300.

[0096] In addition, in order to improve the utilization efficiency of electric energy, the design of the second charging circuit 210 and the second discharging circuit 220 also needs to be adjusted according to the specific application scenario and power requirements. For example, in applications requiring higher output power, energy storage elements with larger capacity and lower internal resistance can be selected to improve the storage and transmission efficiency of electric energy; and in applications requiring higher voltage, energy storage elements with higher withstand voltage values ​​need to be selected to ensure the safety of the circuit.

[0097] Reference Figure 5 as well as Figure 7 Another embodiment of the present invention provides a floating power supply circuit, based on the above Figure 3 In the illustrated embodiment, the second charging circuit 210 includes a third capacitor C25, a second diode D5, and a fourth capacitor C46, ​​wherein:

[0098] The first end of the third capacitor C25 is used to connect to the second power supply; the positive electrode of the second diode D5 is connected to the second end of the third capacitor C25; the first end of the fourth capacitor C46 is connected to the negative electrode of the second diode D5, and the second end of the fourth capacitor C46 is connected to the second conduction end of the second switch tube 500.

[0099] In this embodiment, the second charging circuit 210 provides stable electric energy to the second power supply input terminal through the combination of the third capacitor C25, the second diode D5 and the fourth capacitor C46. Among them, the third capacitor C25 is used as the main energy storage element to store the electric energy output by the second power supply in the second working stage A2 of the second power supply circuit 200. When the third capacitor C25 is fully charged, it returns to the first working cycle T1 of the first working stage A1; in the second working stage A2, the second diode D5 plays a role in preventing current reflux and ensuring the unidirectional flow of electric energy. The fourth capacitor C46 provides a stable supply of electric energy to the second power supply input terminal of the driving circuit 300.

[0100] Reference Figure 5 as well as Figure 7 Another embodiment of the present invention provides a floating power supply circuit, based on the above Figure 3 In the illustrated embodiment, the second discharge circuit 220 includes a second inductor L2, wherein:

[0101] The first end of the second inductor L2 is connected to the second end of the third capacitor C25 , the first end of the second inductor L2 is connected to the anode of the second diode D5 , and the second end of the second inductor L2 is connected to the second end of the fourth capacitor C46 .

[0102] In this embodiment, the second inductor L2 is used in the first working cycle T1 of the first working stage A1, and the electric energy stored in the third capacitor C25 is continuously and stably output to the second power input terminal of the driving circuit 300 through the second inductor L2. Through the energy storage characteristics of the inductor, the second inductor L2 accumulates magnetic flux during the discharge process of the third capacitor C25 in the first working cycle T1 of the first working stage A1, and discharges in the second working cycle T2 of the first working stage A1. During the discharge process, the magnetic flux will be converted into electric energy and supplied to the driving circuit 300 through the second diode D5 and the fourth capacitor C46, ​​thereby ensuring the stable operation of the driving circuit 300 and providing a stable and reliable power supply for the driving circuit 300.

[0103] Reference Figure 4 Another embodiment of the present invention provides a floating power supply circuit based on the above Figures 1 to 3 as well as Figure 5 In any of the illustrated embodiments, the floating power supply circuit further includes a voltage stabilizing circuit 600, wherein:

[0104] The voltage stabilizing circuit 600 is electrically connected to the first power supply circuit 100 and the second power supply circuit 200 respectively; the voltage stabilizing circuit 600 is used to stabilize the output voltage of the first power supply circuit 100 and the output voltage of the second power supply circuit 200.

[0105] In this embodiment, the voltage stabilizing circuit 600 may be a common circuit element, such as a linear regulator or a switching regulator, which is used to ensure that the output voltage can be maintained at a stable value regardless of how the input voltage fluctuates. This is crucial for the stable operation of the driving circuit 300, because an unstable power supply may cause the circuit performance to degrade or even damage sensitive components in the circuit. Among them, a voltage regulator tube may be used for voltage stabilization.

[0106] The voltage stabilizing circuit 600 is electrically connected to the first power supply circuit 100 and the second power supply circuit 200, respectively. This means that no matter whether the electric energy provided by the first power supply circuit 100 or the second power supply circuit 200 needs to be processed by the voltage stabilizing circuit 600, so as to ensure that the electric energy finally supplied to the driving circuit 300 is stable and reliable, thereby improving the reliability and stability of the circuit, and enabling the circuit to maintain excellent performance in various complex working environments.

[0107] In addition, the specific implementation of the voltage stabilizing circuit 600 can also be selected according to specific application scenarios and requirements. For example, if the circuit is sensitive to noise, a voltage stabilizer with low noise characteristics can be selected; if the circuit requires high efficiency, a switching regulator can be selected, thereby providing a more stable and reliable power supply for the driving circuit 300.

[0108] In order to better explain the inventive concept of the present invention, the working principle of the floating power supply circuit of the present invention is described below in combination with all the above embodiments:

[0109] Please refer to Figures 5 to 7 As shown, the floating power supply circuit is a circuit of a channel of the digital power amplifier. The floating power supply circuit is constructed using discrete devices. After the first switch tube 400 and the second switch tube 500 are alternately turned on, the voltage of the voltage node V18 relative to the ground is floating, and the required voltage is output using the network floating relative to the ground as a reference point. The voltage of the voltage node V18 alternates between +65V and -65V. As +65V and -65V change, the floating power supply circuit inputs a stable DC voltage at the first power supply end of the drive circuit 300.

[0110] In order to drive the first switch tube 400 to work, the first power supply circuit output to the first power supply end of the driving circuit includes a first capacitor C12, a first diode D3, a second capacitor C26 and a first inductor L1. The first voltage regulator D10 is used to stabilize the voltage of the driving power supply circuit of the first switch tube 400 so that the driving circuit 300 can output a stable driving signal to the first switch tube 400.

[0111] In order to drive the second switch tube 500 to work, the second power supply circuit output to the second power supply end of the driving circuit includes a third capacitor C25, a second diode D5, a fourth capacitor C46 and a second inductor L2. The second voltage regulator D15 is used to stabilize the voltage of the driving power supply circuit of the second switch tube 500 so that the driving circuit 300 can output a stable driving signal to the second switch tube 500.

[0112] like Figure 6 As shown, in the first working stage A1, the current of the first power supply flows through the first capacitor C12, the first diode D3 and the second capacitor C26 to charge and store energy. In the first working cycle T2 of the second working stage A2, the electricity charged by the first capacitor C12 in the first working stage A1 will be discharged through the first switch tube 400 and the first inductor L1 to make the first inductor L1 store energy. At this time, the first diode D3 is reversely cut off until the electricity of the first capacitor C12 is completely released. In the second working cycle T3 of the second working stage A2, the first inductor L1 supplies power to the second capacitor C26 and the first power input terminal of the driving circuit 300 through the first diode D3 until the energy of the first inductor L1 is completely released, and then enters the next round of charging after the discharge is completed.

[0113] like Figure 7 As shown, in the first working cycle T1 of the first working stage A1, the third capacitor C25 discharges to the second inductor L2 through the second switch tube 500, so that the second inductor L2 stores energy. At this time, the second diode D5 is reversely cut off until the power of the third capacitor C25 is completely released. In the second working cycle T2 of the first working stage A1, the second inductor L2 supplies power to the fourth capacitor C46 and the second power input terminal of the driving circuit 300 through the second diode D5 until the power of the second inductor L2 is completely released. In the second working stage A2, the current of the second power supply flows through the third capacitor C25, the second diode D5 and the fourth capacitor C46 to charge and store energy, and enters the next round of discharge after the charging is completed.

[0114] The present invention further provides a switch driving circuit 300, which includes a first switch tube 400 and a second switch tube 500 connected in series; and a floating power supply circuit as shown in the above embodiment, wherein:

[0115] The first power supply terminal of the driving circuit 300 is connected to the power supply terminal of the first power supply circuit 100, the second power supply terminal of the driving circuit 300 is connected to the power supply terminal of the second power supply circuit 200, the first output terminal of the driving circuit 300 is connected to the first controlled terminal of the switching circuit, and the second output terminal of the driving circuit 300 is connected to the second controlled terminal of the switching circuit.

[0116] It is worth noting that since the switch driving circuit 300 of the present invention is based on the above-mentioned floating power supply circuit, the embodiments of the switch driving circuit 300 of the present invention include all technical solutions of all embodiments of the above-mentioned floating power supply circuit, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0117] The present invention also provides an amplifier, comprising the floating power supply circuit as shown in the above embodiment;

[0118] And / or, including the switch driving circuit as shown in the above embodiment.

[0119] It is worth noting that, since the amplifier of the present invention is based on the above-mentioned switch driving circuit, the embodiments of the amplifier of the present invention include all technical solutions of all embodiments of the above-mentioned switch driving circuit, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0120] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0121] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0122] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence or in other words, the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as above, and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods of various embodiments of the present invention.

[0123] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A floating power supply circuit, applied to a switch driving circuit, the switch driving circuit comprising a first switch tube and a second switch tube connected in series, and a driving circuit for driving the first switch tube and the second switch tube to work respectively, characterized in that: The circuit comprises: A first power supply circuit, wherein an input end of the first power supply circuit is connected to a first power supply, and an output end of the first power supply circuit is connected to a first power supply end of the driving circuit; A second power supply circuit, wherein the input end of the second power supply circuit is connected to a second power supply, and the output end of the second power supply circuit is connected to a second power supply end of the driving circuit; wherein In the same operation cycle, the floating power supply circuit has two working stages; In a first working stage, the first power supply circuit stores the electric energy output by the first power supply, and the second power supply circuit outputs the stored electric energy to the second power supply input terminal of the drive circuit, so that the drive circuit drives the first switch tube to turn off and the second switch tube to turn on; In the second working stage, the first power supply circuit outputs the stored electric energy to the first power input terminal of the driving circuit, and the second power supply circuit stores the electric energy output by the second power supply, so that the driving circuit drives the first switch tube to turn on and the second switch tube to turn off.

2. The floating power supply circuit according to claim 1, wherein: The first power supply circuit comprises: a first charging circuit, wherein an input end of the first charging circuit is connected to a first power source; a first discharge circuit, wherein an input end of the first discharge circuit is connected to a first output end of the first charging circuit; The first charging circuit is used to store the electric energy output by the first power supply in a first working stage; In the second working stage, the first power supply circuit has two working cycles; In a first working cycle, the first charging circuit outputs the stored electric energy to the first power input terminal of the driving circuit, and outputs the electric energy to the first discharging circuit for storage; In a second working cycle, the first discharge circuit outputs the stored electric energy to the first power input terminal of the drive circuit.

3. The floating power supply circuit according to claim 2, characterized in that: The first charging circuit comprises: A first capacitor, wherein a first end of the first capacitor is used to connect to a first power source; a first diode, wherein an anode of the first diode is connected to a second end of the first capacitor; A second capacitor, wherein a first end of the second capacitor is connected to the cathode of the first diode, and a second end of the second capacitor is connected to the second conduction end of the first switch tube.

4. The floating power supply circuit according to claim 3, wherein: The first discharge circuit comprises: A first inductor, wherein a first end of the first inductor is connected to a second end of the first capacitor, a first end of the first inductor is connected to an anode of the first diode, and a second end of the first inductor is connected to a second end of the second capacitor.

5. The floating power supply circuit according to claim 1, wherein: The second power supply circuit comprises: a second charging circuit, wherein an input end of the second charging circuit is connected to a second power source; a second discharge circuit, wherein an input end of the second discharge circuit is connected to a first output end of the second charging circuit; In the first working stage, the first power supply circuit has two working cycles; In a first working cycle, the second charging circuit outputs the stored electric energy to the second power input terminal of the driving circuit, and outputs the electric energy to the second discharging circuit for storage; In a second working cycle, the second discharge circuit outputs the stored electric energy to the second power input terminal of the drive circuit; The second charging circuit is used to store the electric energy output by the second power supply in the second working stage.

6. The floating power supply circuit according to claim 5, characterized in that: The second charging circuit comprises: A third capacitor, a first end of the third capacitor is used to connect to a second power supply; a second diode, wherein an anode of the second diode is connected to a second end of the third capacitor; A fourth capacitor, wherein a first end of the fourth capacitor is connected to the cathode of the second diode, and a second end of the fourth capacitor is connected to the second conduction end of the second switch tube.

7. The floating power supply circuit according to claim 6, wherein: The second discharge circuit comprises: A second inductor, wherein a first end of the second inductor is connected to a second end of the third capacitor, a first end of the second inductor is connected to an anode of the second diode, and a second end of the second inductor is connected to a second end of the fourth capacitor.

8. The floating power supply circuit according to any one of claims 1 to 7, characterized in that: Also includes: a voltage stabilizing circuit, the voltage stabilizing circuit being electrically connected to the first power supply circuit and the second power supply circuit respectively; The voltage stabilizing circuit is used to stabilize the output voltage of the first power supply circuit and the output voltage of the second power supply circuit.

9. A switch driving circuit, characterized in that: The switch driving circuit includes a first switch tube and a second switch tube connected in series; and The floating power supply circuit according to any one of claims 1 to 8, wherein: The first power supply terminal of the driving circuit is connected to the power supply terminal of the first power supply circuit, the second power supply terminal of the driving circuit is connected to the power supply terminal of the second power supply circuit, the first output terminal of the driving circuit is connected to the first controlled terminal of the switching circuit, and the second output terminal of the driving circuit is connected to the second controlled terminal of the switching circuit.

10. An amplifier, characterized in that: A floating power supply circuit comprising any one of claims 1 to 8; And / or, comprising the switch driving circuit as claimed in claim 9.

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