A regulating circuit and electronic device

Abstract

The application discloses a regulating circuit and electronic equipment, wherein the regulating circuit comprises: a current limiting circuit configured to receive a power supply provided by an external power supply circuit and configured to set a maximum output current of the power supply in a configurable manner; an energy storage circuit coupled to the current limiting circuit, the energy storage circuit configured to receive the current-limited power supply output by the current limiting circuit and configured to store energy; and a power amplifier circuit coupled to the current limiting circuit, the energy storage circuit and an external load, the power amplifier circuit configured to receive an external input audio signal and configured to obtain a state value of the load, so as to receive the current-limited power supply according to the state value, or to receive the current-limited power supply and the energy storage power supply provided by the energy storage circuit according to the state value, so as to regulate the audio signal and output the regulated audio signal to the load. Therefore, the regulating circuit in the application can effectively reduce the peak-to-average ratio of system power consumption, so as to effectively reduce the peak power consumption of the system under the premise of meeting the output distortion and other indicators of the power amplifier.

Description

Technical Field

[0001] This application relates to the field of power regulation technology, and more particularly to a regulation circuit and electronic device. Background Technology

[0002] Today, with the increasing abundance of electronic devices, the precise adjustment and control of the load power in these devices has also seen significant advancements. In the semiconductor field of audio amplifiers, for example, various speakers, flat panels, and all electronic products with speaker outputs, especially Class D and Class K amplifiers, although they have high operating efficiencies (e.g., 80%), still drive higher peak power compared to Class A amplifiers.

[0003] In scenarios involving low-power adapters or small-capacity batteries, such as using a 5V / 2A adapter to drive an 8W Bluetooth speaker, or a smart panel device based on facial recognition, the average effective power consumption of the system is typically around 10W, with a peak power consumption of 20W for the main system excluding the amplifier and speaker components. In a scenario where the amplifier drives a 3W rms speaker (peak power 7.5W, 80% efficiency), the adapter selection typically requires a power rating greater than 27.5W, meaning users usually need to choose a 36W (12V / 3A) adapter. However, the average effective power consumption in actual applications is only 13W, resulting in a high peak-to-average power consumption ratio and poor economic efficiency for suitable configurations. Conversely, choosing a smaller adapter cannot meet the peak power requirements. Summary of the Invention

[0004] This application provides a regulating circuit and an electronic device, wherein the regulating circuit can solve the problems of high peak-to-average power consumption, poor economic efficiency of corresponding adapter configuration, and large peak power consumption in the prior art regulating circuit system.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing an adjustment circuit, wherein the adjustment circuit includes: a current limiting circuit for receiving power supplied by an external power source and setting the maximum output current of the power source in a configurable manner; an energy storage circuit coupled to the current limiting circuit, the energy storage circuit for receiving the current-limited power output by the current limiting circuit for energy storage; and a power amplifier circuit coupled to the current limiting circuit, the energy storage circuit, and an external load, the power amplifier circuit for receiving an externally input audio signal and obtaining the state value of the load, so as to receive the current-limited power supply by the current limiting circuit, or the energy storage power supply provided by the energy storage circuit and the current-limited power supply by the current limiting circuit according to the state value, so as to adjust the audio signal and output the adjusted audio signal to the load.

[0006] In response to the state value indicating that the load is operating in the average power state, the power amplifier circuit receives the power supply that is current-limited by the current-limiting circuit; in response to the state value indicating that the load is operating in the peak power state, the power amplifier circuit receives the energy storage power supply provided by the energy storage circuit and the power supply that is current-limited by the current-limiting circuit.

[0007] The adjustment circuit also includes a signal processing circuit, which is coupled to the power amplifier circuit. The signal processing circuit is used to receive externally input audio signals, perform preliminary processing on the audio signals, and then send them to the power amplifier circuit.

[0008] The current limiting circuit is also coupled to an external adjustable resistor to limit the maximum output current of the power supply.

[0009] The current limiting circuit includes a soft-start sub-circuit, which is coupled to the power supply and is used to receive the instantaneous power supply sent by the power supply for the first time, so as to limit the current of the instantaneous power supply.

[0010] The power amplifier circuit includes a first oscillator, a first pre-driver sub-circuit, a Class D power amplifier modulator, a first electromagnetic interference suppression sub-circuit, and a Class D power amplifier output sub-circuit. The first oscillator, the first pre-driver sub-circuit, the Class D power amplifier modulator, and the first electromagnetic interference suppression sub-circuit are all coupled to the power supply. The Class D power amplifier modulator is coupled to the first oscillator, the first pre-driver sub-circuit, and the first electromagnetic interference suppression sub-circuit. The Class D power amplifier output sub-circuit is coupled to the first electromagnetic interference suppression sub-circuit, the current limiting circuit, the energy storage circuit, and the load.

[0011] The regulating circuit also includes a control circuit, one end of which is coupled to a current limiting circuit. The control circuit is used to send a control signal to the current limiting circuit to set the current limiting value that limits the maximum output current of the power supply.

[0012] The regulating circuit also includes a conversion circuit, which is coupled to the control circuit and the current limiting circuit. The conversion circuit receives the control signal sent by the control circuit, converts the control signal into a valid configuration signal, and sends it to the current limiting circuit so as to set the current limiting value of the current limiting circuit to limit the maximum output current of the power supply.

[0013] An external inductor is coupled between the control circuit and the current limiting circuit for boost DC-DC conversion.

[0014] The control circuit is a digital control circuit, and the control signal is a digital control signal. The digital control circuit includes a register, and the control signal is sent to the current limiting circuit through the register.

[0015] The current limiting value set by the control circuit for the current limiting circuit is 500mA-5A.

[0016] The power amplifier circuit includes a second oscillator, a second pre-driver sub-circuit, a Class K power amplifier modulator, an oscillator clock, and a Class K power amplifier output sub-circuit. The control circuit includes a logic controller, a current configuration sub-circuit, and a power supply regulation sub-circuit. The second oscillator, the second pre-driver sub-circuit, the Class K power amplifier modulator, and the oscillator clock are all coupled to the power supply. The Class K power amplifier modulator is coupled to the second oscillator, the second pre-driver sub-circuit, and the oscillator clock. The Class K power amplifier output sub-circuit is coupled to the oscillator clock, the power supply regulation sub-circuit, the energy storage circuit, and the load. The logic controller is coupled to the current configuration sub-circuit and the power supply regulation sub-circuit. The current configuration sub-circuit is coupled to a current limiting circuit. The current limiting circuit is coupled to an external inductor. The inductor is coupled to the power supply regulation sub-circuit.

[0017] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide an electronic device, wherein the electronic device includes the adjustment circuit as described in any of the preceding claims.

[0018] The beneficial effects of this application are as follows: Unlike the prior art, the current-limiting circuit in the regulating circuit provided by this application is used to receive power from the external power supply circuit and can limit the maximum output current of the power supply. The energy storage circuit is used to receive the current-limited power output from the current-limiting circuit and store energy. This allows the power amplifier circuit to select to receive the power output from the current-limited power supply, or to receive the combined power output from the energy storage circuit, the energy storage power supply, and the current-limited power supply, based on the current state value of the load it detects. This enables the power amplifier circuit to regulate the externally input audio signal it receives. It also allows the energy storage circuit to compensate the power supply circuit of the current-limiting circuit for potential peak power of the load, avoiding the need to directly increase the voltage level of the power supply that the corresponding power supply can provide to meet the peak power requirement. This effectively reduces the peak-to-average power ratio of the regulating circuit system, thereby effectively reducing the peak power consumption of the system while meeting the power amplifier output distortion and other indicators. Furthermore, by limiting the maximum output current of the power supply through the current limiting circuit, the peak power consumption of the power amplifier can be effectively reduced, thereby reducing the redundancy of the system's adapter power configuration and thus reducing the product implementation cost. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0020] Figure 1 This is a schematic diagram of a conventional Class D power amplifier circuit;

[0021] Figure 2 This is a schematic diagram of a conventional Class K power amplifier circuit;

[0022] Figure 3 This is a schematic diagram of the structure of the first embodiment of the adjustment circuit of this application;

[0023] Figure 4 This is a schematic diagram of the structure of the second embodiment of the adjustment circuit of this application;

[0024] Figure 5 This is a schematic diagram of the structure of the third embodiment of the adjustment circuit of this application;

[0025] Figure 6 This is a schematic diagram of the structure of the fourth embodiment of the adjustment circuit of this application;

[0026] Figure 7 This is a schematic diagram of the structure of the fifth embodiment of the adjustment circuit of this application;

[0027] Figure 8 This is a schematic diagram of the structure of the sixth embodiment of the adjustment circuit of this application;

[0028] Figure 9 yes Figure 8 A schematic diagram of the time and capacitor configuration curves corresponding to the soft start of the medium-regulation circuit;

[0029] Figure 10 This is a schematic diagram of the structure of the seventh embodiment of the adjustment circuit of this application;

[0030] Figure 11 This is a schematic diagram of the structure of an embodiment of the electronic device of this application. Detailed Implementation

[0031] Through long-term research, the inventors discovered that with the increasing abundance of electronic devices, the precise adjustment and control of the load power in these devices has also greatly advanced. However, in the semiconductor field of audio power amplifiers, such as various speakers, flat panels, and all electronic products with speaker outputs, especially Class D and Class K amplifiers, although they have high operating efficiency, such as 80%, their peak driving power is still relatively high compared to Class A amplifiers.

[0032] It should be noted that the following table describes the characteristics of several common types of power amplifiers currently on the market.

[0033]

[0034]

[0035] In the example where the power amplifier is in linear mode and the output power of the PA (Power Amplifier) ​​is 1W rms, the root mean square value of the driving voltage for an 8-ohm speaker is about 2.828V rms, the peak driving voltage is about 4V, and the peak power of the PA driving the power amplifier is 2W. This calculation does not include the efficiency loss of the system drive.

[0036] In scenarios where lithium-ion batteries are used in mobile phones or tablets, and large-capacity batteries are employed, taking a nominal 3.7V 8000mAh battery as an example, the maximum discharge current, such as 2C (where 2C represents a discharge rate of 2), is 16A, providing 59.2W of power. This is more than sufficient for the system's peak power consumption of around 10W. However, in scenarios with low-power adapters or small-capacity batteries, such as using a 5V / 2A adapter to drive an 8W Bluetooth speaker, or a smart panel based on facial recognition, the corresponding effective system power consumption is typically around 10W. The peak power consumption of the main system, excluding the amplifier and speaker components, is 20W. When the amplifier drives a 3W rms speaker (peak power 7.5W, 80% efficiency), the typical adapter configuration is 27.5W, but users need to select a 36W (12V / 3A) adapter according to the selection criteria. However, the average effective power consumption in actual application scenarios is only 13W, resulting in a relatively large peak-to-average power consumption of the system and poor economic efficiency of the adapted configuration.

[0037] Among them, such as Figure 1 As shown, Figure 1 This is a schematic diagram of a conventional Class D power amplifier circuit. Conventional Class D power amplifiers typically have the main power supply or a separate power supply directly supplied to the output stage. As long as the front-end power supply is good, the amplifier can output the predetermined performance to ensure good distortion. Therefore, in the design of power amplifier ICs (Integrated Circuits), additional current limiting modules are usually not added. However, this results in a drawback: the instantaneous capability requirement of the front-end power supply is very high, even exceeding twice the effective output power.

[0038] Furthermore, such as Figure 2 As shown, Figure 2 This is a schematic diagram of a conventional Class K power amplifier circuit. Traditional Class K power amplifiers can usually only periodically limit the current of the BOOST (power supply regulation sub-circuit) module in the power supply current limiting architecture. However, its control accuracy is low and lacks specificity, and it cannot limit the peak power of the power supply input.

[0039] To achieve a peak-to-average power ratio (PAPR) that effectively reduces system power consumption, thereby reducing peak power consumption while meeting requirements such as power amplifier output distortion, this application provides an adjustment circuit and electronic device. The following detailed description, in conjunction with the accompanying drawings and embodiments, further illustrates this application. It should be noted that the following embodiments are for illustrative purposes only and do not limit the scope of this application. Similarly, the following embodiments are only some, not all, embodiments of this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0041] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of the first embodiment of the regulating circuit of this application. In this embodiment, the regulating circuit 10 includes: a current limiting circuit 11, an energy storage circuit 12, and a power amplifier circuit 13.

[0042] The adjustment circuit 10 provided in this application can be installed in electronic devices, such as Bluetooth speakers, high-power Bluetooth speakers, facial recognition panels, tablet computers, and other electronic devices that require built-in power amplifiers. This allows for precise power control of the corresponding load 3 according to specific application scenarios, thereby achieving better functional services. Of course, in other embodiments, the adjustment circuit 10 can also be installed in any other reasonable type of electronic device, and this embodiment does not impose any limitations on this.

[0043] Specifically, the current limiting circuit 11 is connected to the external power supply circuit 2, such as the power system in an electronic device with a built-in regulating circuit 10 or an external power supply device, so as to receive the power supplied by the power supply circuit 2 and set the maximum output current of the power supply in a configurable manner, that is, to ensure that the maximum output current of the power supply never exceeds a set threshold, and to adjust the set threshold according to actual needs.

[0044] The energy storage circuit 12 is coupled to the current limiting circuit 11 so that it can receive the current-limited power output from the current limiting circuit 11 and store energy through the current-limited power to supplement the power supply when the front-end power supply is insufficient, that is, the power output of the power circuit 2 cannot meet the current power demand of the load 3. At the same time, it satisfies the requirements of the front-end current limiting output not being overloaded and the maximum output current being controllable.

[0045] Furthermore, the power amplifier circuit 13 is coupled to the current limiting circuit 11, the energy storage circuit 12, and the external load 3. The load 3 can be any reasonable power-consuming device such as a speaker or horn assembly. The power amplifier circuit 13 receives externally input audio signals and can detect and acquire the status value of the load 3. For example, by monitoring the current peak power of the load 3 in real time, it can select to receive power output from the power supply limited by the current limiting circuit 11, or receive power output from both the energy storage power provided by the energy storage circuit 12 and the power supply limited by the current limiting circuit 11, based on the current status value of the load 3.

[0046] Furthermore, the power amplifier circuit 13 can adjust the audio signal based on the power supply output it receives, for example, by amplifying and adjusting the power, and output the adjusted audio signal to the load 3 so that the load 3 can work.

[0047] It is understood that in other embodiments, the audio signal may also be a video signal or any other signal that reasonably requires power regulation, and this application does not limit it in this regard.

[0048] Optionally, the current limiting circuit 11 specifically includes an electronic circuit with current limiting function; or, the current limiting circuit 11 is specifically an integrated circuit designed with a current limiting scheme that can realize program control, so as to reduce the peak power consumption of the power amplifier circuit 13, thereby reducing the redundancy of the system's adapter power configuration, and at the same time reducing the cost of the corresponding electronic products.

[0049] It should be noted that the power amplifier circuit 13 may specifically include a power amplifier, which is an amplifier capable of producing maximum power output to drive a load 3 (e.g., a loudspeaker) under a given distortion rate. The power amplifier plays the role of "amplifying and outputting audio signals" in the entire audio system, and to a certain extent, determines whether the entire system can provide good sound quality output.

[0050] Specifically, in response to the power amplifier circuit 13 detecting that the current state value of the load 3 indicates that the load 3 is operating in the average power state, the power amplifier circuit 13 receives the power supply after the current is limited by the current limiting circuit 11; while in response to the power amplifier circuit 13 detecting that the current state value of the load 3 indicates that the load 3 is operating in the peak power state, the power amplifier circuit 13 receives the energy storage power supply provided by the energy storage circuit 12 and the power supply after the current is limited by the current limiting circuit 11.

[0051] Understandably, power fluctuations are inevitable in the actual operation of the power amplifier circuit 13. For example, a large operating current is usually required to start each functional device initially, but this peak power state is usually short-lived. Most of the time, the functional devices operate in an average power state, which requires a much smaller operating current than the peak power state. However, to ensure the normal operation of the regulation circuit 10, the power supply method corresponding to the peak power state of the load 3 must be considered. This necessitates increasing the voltage and current levels of the power supply circuit 2, or adjusting the corresponding adapter configuration, to meet normal operating requirements. However, this significantly increases the peak-to-average power ratio of the regulation circuit 10, resulting in poor economic efficiency for the appropriate configuration for the average effective power consumption in practical applications.

[0052] In the above-described scheme, the medium-power amplifier circuit 13 in the regulating circuit 10 selects to receive the power supply after current limiting by the current limiting circuit 11, or the energy storage power supply provided by the energy storage circuit 12 and the power supply after current limiting by the current limiting circuit 11, based on the current state value of the load 3 it detects. This allows the energy storage circuit 12 to compensate for the power supply circuit of the current limiting circuit 11 for the peak power required by the load 3, avoiding the need to directly increase the voltage level of the power supply provided by the power supply circuit 2 to meet the peak power requirement. This effectively reduces the peak-to-average power ratio of the regulating circuit 10 system, thereby effectively reducing the peak power consumption of the system while meeting indicators such as power amplifier output distortion. Furthermore, by limiting the maximum output current of the power supply circuit 2 through the current limiting circuit 11, the peak power consumption of the power amplifier can also be effectively reduced, thereby reducing the redundancy of the system's adapter power configuration and lowering the product implementation cost. In addition, it can effectively reduce the demand on the system power supply circuit 2 and meet the application requirements of small-capacity batteries.

[0053] In one embodiment, the current-limiting circuit 11 in the regulating circuit 10 is also coupled to an external adjustable resistor (not shown in the figure). Specifically, the maximum output current of the power supply is limited by the adjustable resistor. For example, when the power supply circuit 2 experiences a peak power output, the adjustable resistor can shunt the peak power output to effectively reduce the peak power consumption of the power amplifier, thereby reducing the redundancy of the system's adapter power configuration and reducing product costs. Furthermore, by placing the adjustable resistor outside the regulating circuit 10, the circuit complexity of the regulating circuit 10 can be effectively reduced, and the internal assembly space occupied by the regulating circuit 10 can be reduced, which is more conducive to the manufacturing and functional implementation of the regulating circuit 10. The adjustable resistance value can also be dynamically configured according to the current actual needs to adapt to the real-time changing current-limiting scenario. In other embodiments, the adjustable resistor can also be a fixed resistor to limit the maximum output current of the power supply under normal scenarios. This application does not limit this.

[0054] In one embodiment, the current limiting circuit 11 in the regulating circuit 10 further includes a soft starter sub-circuit (not shown in the figure), and the soft starter sub-circuit is coupled to the power supply circuit 2 to control the instantaneous power drop or overload caused when the power supply circuit 2 is turned on for the first time. For example, it can limit the instantaneous large current, slow down the trend of instantaneous power drop, and suppress the occurrence of overload.

[0055] Understandably, when functional devices in a circuit are started up, they inevitably generate extremely large current signals, exceeding the current limit that most functional devices can withstand. Therefore, by limiting the instantaneous power supply, irreversible damage to the functional devices in the regulating circuit can be effectively avoided.

[0056] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of the second embodiment of the adjustment circuit of this application. This embodiment is based on the first embodiment of the adjustment circuit provided in this application, and the adjustment circuit 20 further includes a signal processing circuit 24.

[0057] Understandably, in order to ensure that the power amplifier circuit 23 can effectively regulate the externally input audio signal, it is usually necessary to perform preliminary processing on the audio signal to make it meet certain characteristics, such as making it effectively recognizable or making the signal quality better.

[0058] Specifically, the signal processing circuit 24 is coupled to the power amplifier circuit 23. The signal processing circuit 24 is used to receive externally input audio signals and perform preliminary processing on the audio signals, such as modulation, filtering, and electromagnetic interference suppression, before sending them to the power amplifier circuit 23.

[0059] In one specific embodiment, the signal processing circuit 24 further includes a preamplifier sub-circuit (not shown), a modulator (not shown), and an electromagnetic interference suppression sub-circuit (not shown) to receive externally input audio signals through the preamplifier sub-circuit, modulate the audio signals through the modulator, and then send the modulated audio signals to the power amplifier circuit 23 after electromagnetic interference suppression by the electromagnetic interference suppression sub-circuit.

[0060] It should be noted that a modulator is a device that uses digital signal processing technology to modulate low-frequency digital signals (such as audio, video, and data) onto high-frequency digital signals for signal transmission. Modulators are widely used in the transmission of information such as broadcast (audio signals) and television (video signals). Modulators are generally used in pairs with demodulators; the modulator processes the digital signal onto a high-frequency signal for transmission, while the demodulator restores the digital signal to its original form.

[0061] It is understood that the current limiting circuit 21, energy storage circuit 22, and power amplifier circuit 23 are the same as the current limiting circuit 11, energy storage circuit 12, and power amplifier circuit 13, respectively. Please refer to [link / reference] for details. Figure 3 The relevant textual content will not be repeated here.

[0062] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of the third embodiment of the adjustment circuit of this application. This embodiment is based on the first embodiment of the adjustment circuit provided in this application, and the adjustment circuit 30 further includes a control circuit 34.

[0063] Specifically, one end of the control circuit 34 is coupled to the current limiting circuit 31 so that the current limiting circuit 31 can set the current limiting value of the maximum output current of the power supply by sending a control signal to the current limiting circuit 31, that is, the maximum value of the current that the current limiting circuit 31 can output is limited.

[0064] The energy storage circuit 32 and power amplifier circuit 33 are the same as those of energy storage circuit 12 and power amplifier circuit 13. Please refer to [link / reference] for details. Figure 3 The relevant textual content will not be repeated here.

[0065] In one embodiment, the control circuit 34 is specifically a digital control circuit, and the corresponding control signal is a digital control signal. The digital control circuit 34 specifically includes a register, and the control signal can send a digital control signal to the current limiting circuit 31 through the register, so as to finely control the current limiting value of the maximum output current of the current limiting circuit 31.

[0066] In one embodiment, an external inductor (not shown) is coupled between the control circuit 34 and the current limiting circuit 31. This inductor specifically receives the control signal sent by the control circuit 34 and, in conjunction with a corresponding switch inside or outside the control circuit, controls the on / off state of the control signal sent by the control circuit 34 to the current limiting circuit 31. Simultaneously, it performs a boost DC-DC conversion to forward the converted control signal to the current limiting circuit 31. Furthermore, by placing this inductor outside the regulating circuit 30, the circuit complexity of the regulating circuit 30 can be effectively reduced, and the internal assembly space occupied by the regulating circuit 30 can be minimized, thus facilitating the manufacturing and functional implementation of the regulating circuit 30.

[0067] Optionally, the current limiting value set by the control circuit 34 for the current limiting circuit 31 is 500mA-5A, that is, the control circuit 34 can limit the maximum output current of the current limiting circuit 31 to 500mA-5A, and the user can configure it according to the specific supply capacity. This application does not limit it in this regard.

[0068] Please see Figure 6 , Figure 6 This is a schematic diagram of the fourth embodiment of the adjustment circuit of this application. This embodiment is based on the third embodiment of the adjustment circuit provided in this application, and the adjustment circuit 40 further includes a conversion circuit 45.

[0069] Specifically, the conversion circuit 45 is coupled to the control circuit 44 and the current limiting circuit 41. The conversion circuit 45 is used to receive the control signal sent by the control circuit 44 and convert the control signal into a valid configuration signal. For example, the digital control signal sent by the control circuit 44 is converted into a program instruction or analog control signal and then sent to the current limiting circuit 41. In this way, the current limiting circuit 41 can set the current limiting value of the maximum output current of the power supply through the valid configuration signal.

[0070] The energy storage circuit 42 and power amplifier circuit 43 are the same as the energy storage circuit 32 and power amplifier circuit 33, please refer to [link / reference] for details. Figure 5 The relevant textual content will not be repeated here.

[0071] Please see Figure 7 , Figure 7 This is a schematic diagram of the fifth embodiment of the adjustment circuit of this application.

[0072] In this embodiment, the regulating circuit is specifically a power regulating and delivery device for a Class D or Class K power amplifier. By adding a current limiting circuit, an energy storage circuit, and / or an additional power compensation circuit to the current demand end of the regulating circuit, i.e., the independent power supply end of the Class D or Class K power amplifier, the current intake of the regulating circuit can be limited, while still ensuring the performance of the power amplifier to a certain extent.

[0073] Optionally, the energy storage circuit can also be integrated outside the regulation circuit, and specifically it can be an energy storage capacitor or any other reasonable energy storage device and energy storage electronic circuit, which is not limited in this application.

[0074] Meanwhile, in order to adapt to the power consumption of different Class D power amplifiers and the actual supply requirements of the front end, in one embodiment, different current limiting designs can also be implemented through external hardware or software configuration.

[0075] Specifically, such as Figure 7 As shown, when the peak power consumed by the load terminal ④ exceeds the peak power consumption that the system power input terminal ① can provide, but meets the average power consumption, after adding the current limiting circuit 51, by providing an additional power compensation path ②, the situation of instantaneous insufficient front-end input is avoided, and the risk of front-end overload is also avoided.

[0076] Please see Figure 8 , Figure 8 This is a schematic diagram of the sixth embodiment of the adjustment circuit of this application. This embodiment is based on the first embodiment of the adjustment circuit provided in this application. The adjustment circuit 50 is specifically a power adjustment and delivery device for a Class D power amplifier, and its power amplification circuit 53 further includes a first oscillator 531, a first pre-drive sub-circuit 532, a Class D power amplifier modulator 533, a first electromagnetic interference suppression sub-circuit 534, and a Class D power amplifier output sub-circuit 535. The first oscillator 531, the first pre-drive sub-circuit 532, the Class D power amplifier modulator 533, and the first electromagnetic interference suppression sub-circuit 534 are all coupled to the power supply. The Class D power amplifier modulator 533 is coupled to the first oscillator 531, the first pre-drive sub-circuit 532, and the first electromagnetic interference suppression sub-circuit 534. The Class D power amplifier output sub-circuit 535 is coupled to the first electromagnetic interference suppression sub-circuit 534, the current limiting circuit 51, the energy storage circuit 52, and the load 3.

[0077] Understandably, the current limiting circuit 51 and energy storage circuit 52 are the same as the current limiting circuit 11 and energy storage circuit 12. Please refer to [link / reference] for details. Figure 3 The relevant textual content will not be repeated here.

[0078] Furthermore, the current limiting circuit 51 also has the following two features:

[0079] 1. High response rate, with a current limiting response rate in the microsecond (µs) range;

[0080] 2. The current limiting circuit 51 operates in linear mode. When the current at the load terminal 3 exceeds the configured output of the current limiting circuit 51, the current limiting circuit 51 will still supply the maximum configured output current.

[0081] The current limiting circuit 51 is also equipped with a soft-start configuration function for power-on output, namely a soft-start sub-circuit. When the power supply input exceeds the driving capability of the internal switching transistor of the current limiting circuit 51 or exceeds the output current value configured by the user, the user can configure a capacitor in the soft-start sub-circuit of the current limiting circuit 51 to protect the safety of the hardware module and avoid malfunction of the current limiting circuit 51.

[0082] Among them, such as Figure 9 As shown, Figure 9 yes Figure 8 The diagram shows the time and capacitor configuration curves corresponding to the soft start of the 50-phase adjustment circuit. It can be seen that by configuring different capacitor values, the soft start delay time can be configured, and the relationship between the two satisfies t = A * Vin * C, where A is a constant, Vin is the power amplifier's supply voltage, and C is the soft start configuration capacitor. Figure 9 The example provided is a soft-start time and capacitor configuration curve for a 5V power supply input voltage, so that the capacitor in the soft-start sub-circuit can be configured reasonably according to the configuration curve and the actual required soft-start time.

[0083] Furthermore, the current limiting value of the maximum output current corresponding to the current limiting circuit 51 is specifically configured through an external resistor R1. This method is relatively simple and can be configured with a fixed current limiting value according to specific customer designs and needs. Users can configure different current limiting values ​​using only an external 1% resistor; and the magnitude of the current limiting value is linearly related to the resistance value, with the current limiting value I... lim =B*R lim Where B is a constant, R lim The configuration parameters of resistor R1 can be obtained by using the above linear function and the actual required current limiting value.

[0084] Meanwhile, a dedicated energy storage circuit 52 is provided between the output of the current limiting circuit 51 and the output section of the Class D power amplifier, so that when the power supply demand of the Class D power amplifier output sub-circuit 535 exceeds the maximum output current that the current limiting circuit 51 can provide, the energy storage circuit 52 can provide transient power.

[0085] Optionally, the energy storage circuit 52 can also be integrated outside the regulation circuit 50, and specifically it can be an energy storage capacitor or any other reasonable energy storage device and energy storage electronic circuit, so as to supplement the power supply when the front-end power supply is insufficient, that is, the power output of the power supply circuit 2 cannot meet the current power demand of the load 3, and at the same time satisfy the front-end current limiting output without overload and the audio distortion controllable. This application does not limit this.

[0086] Please see Figure 10 , Figure 10This is a schematic diagram of the seventh embodiment of the adjustment circuit of this application. This embodiment is based on the third embodiment of the adjustment circuit provided in this application. Specifically, the adjustment circuit 60 is a power adjustment and delivery device for a Class K power amplifier, and its power amplification circuit 63 further includes a second oscillator 631, a second pre-drive sub-circuit 632, a Class K power amplifier modulator 633, a second electromagnetic interference suppression sub-circuit 634, and a Class K power amplifier output sub-circuit 635. The control circuit 64 includes a logic controller 641, a current configuration sub-circuit 642, and a power supply adjustment sub-circuit 643. The second oscillator 631, the second pre-drive sub-circuit 632, and the Class K power amplifier modulator 633 are described. The second electromagnetic interference suppression sub-circuit 634 is coupled to the power supply. The Class K power amplifier modulator 633 is coupled to the second oscillator 631, the second pre-drive sub-circuit 632, and the second electromagnetic interference suppression sub-circuit 634. The Class K power amplifier output sub-circuit 635 is coupled to the second electromagnetic interference suppression sub-circuit 634, the power amplification sub-circuit 643, the energy storage circuit 62, and the load 3. The logic controller 641 is coupled to the current configuration sub-circuit 642 and the power supply regulation sub-circuit 643. The current configuration sub-circuit 642 is coupled to the current limiting circuit 61. The current limiting circuit 61 is coupled to the external inductor. The inductor is coupled to the power supply regulation sub-circuit 643.

[0087] Understandably, the current limiting circuit 61 and energy storage circuit 62 are the same as the current limiting circuit 31 and energy storage circuit 32. Please refer to [link / reference] for details. Figure 5 The relevant textual content will not be repeated here.

[0088] like Figure 10 As shown, the corresponding current limiting circuit 61 specifically adopts a digital control scheme. Therefore, a logic controller 641 and a current configuration module are added. The logic controller 641 can be an 8-bit register to perform fine-grained control of the current limiting value, and can specifically configure the corresponding current limiting value to 500mA-5A. The current configuration module is used to translate the current limiting configuration command transmitted by the logic controller 641, so as to convert the current limiting configuration command into the actual current limiting value configuration size.

[0089] Similarly, a dedicated energy storage circuit 62 is provided between the output of the current limiting circuit 61 and the output sub-circuit 635 of the Class K power amplifier, so that when the power supply demand of the output sub-circuit 635 of the Class K power amplifier exceeds the maximum output current that the current limiting circuit 61 can provide, the energy storage circuit 62 can provide transient power.

[0090] Optionally, the energy storage circuit 62 can also be integrated outside the regulation circuit 60, and specifically it can be an energy storage capacitor or any other reasonable energy storage device and energy storage electronic circuit, so as to provide power supplementation when the front-end power supply is insufficient, that is, the power output of the power supply circuit 2 cannot meet the current power demand of the load 3, and at the same time satisfy the front-end current limiting output not to overload and the audio distortion controllable. This application does not limit this.

[0091] Furthermore, by setting an external inductor L1 between the output of the current limiting circuit 61 and the output sub-circuit 635 of the Class K power amplifier, the output current of the current limiting circuit 61 can be effectively stabilized. By placing this inductor outside the regulating circuit 60, the circuit complexity of the regulating circuit 60 can be effectively reduced, and the assembly space occupied inside the regulating circuit 60 can be reduced, which is more conducive to the manufacturing and functional realization of the regulating circuit 60.

[0092] It should be noted that the power supply regulation sub-circuit 643 can specifically implement power amplification, power supply boost and current limiting functions.

[0093] Please see Figure 11 , Figure 11 This is a schematic diagram of the structure of an embodiment of the electronic device of this application.

[0094] In this embodiment, the electronic device 70 includes an adjustment circuit 71. It should be noted that the adjustment circuit 71 described in this embodiment is any of the adjustment circuits 10, 20, 30, 40, 50 or 60 described in the above embodiments, and will not be repeated here.

[0095] Optionally, the electronic device 70 can be any reasonable electronic device such as a Bluetooth speaker, a high-power Bluetooth speaker, a face recognition panel, or a tablet computer; this application does not limit the scope of the application.

[0096] Unlike existing technologies, the current-limiting circuit in the regulating circuit provided in this application receives power from an external power supply circuit and limits the maximum output current of that power supply. The energy storage circuit receives and stores the current-limited power output from the current-limiting circuit. This allows the power amplifier circuit to select, based on the detected current state of the load, either to receive the power output limited by the current-limiting circuit, or to receive a combined power output from both the energy storage circuit and the current-limited power supply. This enables the adjustment of the received external audio signal. Furthermore, the energy storage circuit compensates for potential peak power demands from the current-limiting circuit's power supply circuit, avoiding the need to directly increase the voltage level of the power supply to meet peak power requirements. This effectively reduces the peak-to-average power ratio of the regulating circuit system, thus reducing peak power consumption while meeting power amplifier output distortion and other performance indicators. Moreover, limiting the maximum output current of the power supply through the current-limiting circuit also effectively reduces the peak power consumption of the power amplifier, thereby reducing the redundancy of the adapter power configuration and lowering the product implementation cost.

[0097] The above are merely embodiments of this application and do not limit the scope of this patent application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. An adjustment circuit, characterized in that, The regulating circuit includes: A current limiting circuit is used to receive power from an external power supply circuit and to set the maximum output current of the power supply in a configurable manner. An energy storage circuit is coupled to the current limiting circuit. The energy storage circuit is used to receive the current-limited power output by the current limiting circuit for energy storage. A power amplifier circuit is coupled to the current limiting circuit, the energy storage circuit, and an external load. The power amplifier circuit is used to receive an externally input audio signal and obtain the state value of the load. Based on the state value, it receives the power supply that is current-limited by the current limiting circuit, or the energy storage power supply provided by the energy storage circuit and the power supply that is current-limited by the current limiting circuit, so as to adjust the audio signal and output the adjusted audio signal to the load. In response to the state value indicating that the load is operating in an average power state, the power amplifier circuit receives the power supply that has been current-limited by the current-limiting circuit; In response to the state value indicating that the load is operating in peak power state, the power amplifier circuit receives the energy storage power provided by the energy storage circuit and the power supply that has been current-limited by the current limiting circuit; The regulating circuit also includes a control circuit, one end of which is coupled to the current limiting circuit and is used to send a control signal to the current limiting circuit to set a current limiting value that limits the maximum output current of the power supply.

2. The adjustment circuit according to claim 1, characterized in that, The adjustment circuit further includes a signal processing circuit, which is coupled to the power amplifier circuit. The signal processing circuit is used to receive the externally input audio signal, perform preliminary processing on the audio signal, and then send it to the power amplifier circuit.

3. The adjustment circuit according to claim 1, characterized in that, The current limiting circuit is also coupled to an external adjustable resistor to configure the maximum output current of the power supply through the adjustable resistor.

4. The adjustment circuit according to claim 1, characterized in that, The current limiting circuit includes a soft-start sub-circuit, which is coupled to the power supply and is used to control the instantaneous power drop or overload of the power supply.

5. The adjustment circuit according to claim 3, characterized in that, The power amplifier circuit includes a first oscillator, a first pre-driver sub-circuit, a Class D power amplifier modulator, a first electromagnetic interference suppression sub-circuit, and a Class D power amplifier output sub-circuit. The first oscillator, the first pre-driver sub-circuit, the Class D power amplifier modulator, and the first electromagnetic interference suppression sub-circuit are all coupled to the power supply. The Class D power amplifier modulator is coupled to the first oscillator, the first pre-driver sub-circuit, and the first electromagnetic interference suppression sub-circuit. The Class D power amplifier output sub-circuit is coupled to the first electromagnetic interference suppression sub-circuit, the current limiting circuit, the energy storage circuit, and the load.

6. The adjustment circuit according to claim 1, characterized in that, The regulating circuit further includes a conversion circuit, which is coupled to the control circuit and the current limiting circuit. The conversion circuit receives the control signal sent by the control circuit, converts the control signal into a valid configuration signal, and sends it to the current limiting circuit so as to set the current limiting value of the current limiting circuit to limit the maximum output current of the power supply through the valid configuration signal.

7. The adjustment circuit according to claim 1, characterized in that, An external inductor is also coupled between the control circuit and the current limiting circuit. The inductor is used for boost DC-DC conversion.

8. The adjustment circuit according to any one of claims 1, 6 and 7, characterized in that, The control circuit is a digital control circuit, the control signal is a digital control signal, the digital control circuit includes a register, and the control signal sends the digital control signal to the current limiting circuit through the register.

9. The adjustment circuit according to any one of claims 1, 6, and 7, characterized in that, The control circuit sets the current limiting value for the current limiting circuit to 500mA-5A.

10. The adjustment circuit according to claim 1, characterized in that, The power amplifier circuit includes a second oscillator, a second pre-driver sub-circuit, a Class K power amplifier modulator, an oscillator clock, and a Class K power amplifier output sub-circuit. The control circuit includes a logic controller, a current configuration sub-circuit, and a power supply regulation sub-circuit. The second oscillator, the second pre-driver sub-circuit, the Class K power amplifier modulator, and the oscillator clock are all coupled to the power supply. The Class K power amplifier modulator is coupled to the second oscillator, the second pre-driver sub-circuit, and the oscillator clock. The Class K power amplifier output sub-circuit is coupled to the oscillator clock, the power supply regulation sub-circuit, the energy storage circuit, and the load. The logic controller is coupled to the current configuration sub-circuit and the power supply regulation sub-circuit. The current configuration sub-circuit is coupled to the current limiting circuit. The current limiting circuit is coupled to an external inductor. The inductor is coupled to the power supply regulation sub-circuit.

11. An electronic device, characterized in that, The electronic device includes the adjustment circuit as described in any one of claims 1-10.

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