Threshold oscillation control device and related means and wireless earphone

Abstract

The embodiment of the application provides a critical value oscillation control device and related device and a wireless earphone, the control device comprises: a first operational amplifier, a second operational amplifier, a comparator, a logic control module, a DCDC controller, a timing module and a logic processing module, the logic control module is used for determining the value of a mode conversion instruction signal according to the working mode of a first running period, the mode conversion instruction signal is the output signal of the DCDC controller; the logic control module is used for determining the overvoltage judgment threshold of a second running period according to the value of the mode conversion instruction signal, the type of the load current and the output signal of the logic processing module, the second running period is a period after the first running period; the comparator is used for overvoltage judgment in the second running period according to the overvoltage judgment threshold, the accuracy of the overvoltage judgment threshold determination can be improved, thereby reducing the formation of oscillation ripple and improving stability.

Description

Technical Field

[0001] This application relates to the field of circuit structure technology, specifically to a critical value oscillation control device and related components, as well as wireless headphones. Background Technology

[0002] In recent years, with the rapid development of smartphone technology and the increasing demand for thinner and lighter phones, many flagship phones have successively removed the 3.5mm headphone jack. Therefore, the demand for wireless Bluetooth headphones is growing. Due to their small size and low power consumption, wireless Bluetooth headphones have lower operating and charging currents than many other consumer electronics products. Because wireless Bluetooth headphones operate on low current, the requirements for current ripple are becoming increasingly stringent. Especially when the charging current drops to near the critical point for switching to low-power mode, fluctuations in the mode selection threshold can cause output voltage oscillations, resulting in lower stability. Summary of the Invention

[0003] This application provides a critical value oscillation control device, related components, and a wireless headset, which can improve the accuracy of overvoltage judgment threshold determination, thereby reducing the formation of oscillation ripple and improving stability.

[0004] A first aspect of this application provides a critical value oscillation control device, the control device comprising: a first operational amplifier, a second operational amplifier, a comparator, a logic control module, a DC-DC controller, a timing module, and a logic processing module, wherein...

[0005] The input port of the first operational amplifier is connected to the input port of the second operational amplifier; the output port of the first operational amplifier is connected to the first input port of the comparator; the output port of the second operational amplifier is connected to the second input port of the comparator; the output port of the comparator is connected to the first input port of the logic control module; the output port of the logic control module is connected to the input port of the DC-DC controller and the input port of the timing module; the output port of the DC-DC controller is connected to the second input port of the logic control module and the first input port of the logic processing module; the output port of the timing module is connected to the second input port of the logic processing module; and the output port of the logic processing module is connected to the third input port of the logic control module.

[0006] The logic control module is used to determine the value of the mode switching indication signal according to the working mode of the first operating cycle, and the mode switching indication signal is the output signal of the DC-DC controller;

[0007] The logic control module is used to determine the overvoltage judgment threshold of the second operating cycle based on the value of the mode conversion indication signal, the type of load current, and the output signal of the logic processing module. The second operating cycle is the cycle after the first operating cycle.

[0008] The comparator is used to make an overvoltage judgment within the second operating cycle based on the overvoltage judgment threshold.

[0009] In conjunction with the first aspect, in one possible implementation, the control device further includes: a first resistor and a second resistor, wherein the second end of the first resistor is connected to the first end of the second resistor, the input port of the first operational amplifier, and the input port of the second operational amplifier, the second end of the second resistor is grounded, and the first end of the first resistor is a signal input port.

[0010] In conjunction with the first aspect, in one possible implementation, the logic control module is used to determine the overvoltage judgment threshold for the second operating cycle based on the value of the mode transition indication signal, the type of load current, and the output signal of the logic processing module, including:

[0011] The logic control module is used to perform an OR operation based on the value of the mode conversion indication signal, the type of load current, and the output signal of the logic processing module to obtain the calculation result;

[0012] The logic control module is used to determine the overvoltage judgment threshold for the second operating cycle based on the calculation result.

[0013] In conjunction with the first aspect, in one possible implementation, the logic control module is used to determine the value of the mode transition indication signal based on the operating mode of the first operating cycle, including:

[0014] The logic control module is used to determine the value of the mode conversion indication signal as a first value if the working mode of the first operating cycle is PWM working mode.

[0015] If the operating mode of the first operating cycle is PSM operating mode, then the value of the mode conversion indication signal is determined as the second value.

[0016] In conjunction with the first aspect, in one possible implementation, the control device further includes a filtering module, which includes a third resistor and a first capacitor. The first end of the third resistor is connected to the input port of the first operational amplifier and the first end of the first capacitor, and the second end of the third resistor is connected to the second end of the first resistor, the first end of the second resistor, and the second end of the first capacitor.

[0017] A second aspect of this application provides a critical value oscillation control device, the control device including a circuit board and the critical value oscillation control apparatus described in any one of the first aspects.

[0018] A third aspect of this application provides a wireless earphone, the wireless earphone including a housing and a critical value oscillation control device as described in the second aspect.

[0019] Implementing the embodiments of this application has at least the following beneficial effects:

[0020] The critical value oscillation control device includes a first operational amplifier, a second operational amplifier, a comparator, a logic control module, a DC-DC controller, a timing module, and a logic processing module. The input ports of the first and second operational amplifiers are connected, and the output port of the first operational amplifier is connected to the first input port of the comparator. The output port of the second operational amplifier is connected to the second input port of the comparator. The output port of the comparator is connected to the first input port of the logic control module. The output port of the logic control module is connected to the input ports of the DC-DC controller and the timing module. The output port of the DC-DC controller is connected to the second input port of the logic control module and the first input port of the logic processing module. The output port of the timing module is connected to the second input port of the logic processing module. The output port of the logic processing module is connected to the third input port of the logic control module. The logic control module is used to determine the value of the mode conversion indication signal according to the working mode of the first operating cycle. The mode conversion indication signal is the output signal of the DC-DC controller. The logic control module is used to determine the overvoltage judgment threshold of the second operating cycle according to the value of the mode conversion indication signal, the type of load current, and the output signal of the logic processing module. The second operating cycle is the cycle after the first operating cycle. The comparator is used to perform overvoltage judgment within the second operating cycle according to the overvoltage judgment threshold. Therefore, overvoltage judgment can be performed by using the overvoltage judgment threshold determined by the value of the mode conversion indication signal, the type of load current, and the output signal of the logic processing module, thereby improving the accuracy of overvoltage judgment, reducing the formation of oscillation ripple, and improving stability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0022] Figure 1 This application provides a schematic diagram of the structure of a critical value oscillation control device according to an embodiment;

[0023] Figure 2 A schematic diagram of another critical value oscillation control device is provided for embodiments of this application;

[0024] Figure 3 This application provides a basic logic diagram of a logic control module.

[0025] Figure 4 An output waveform diagram at a critical current is provided in an embodiment of this application;

[0026] Figure 5 This application provides an embodiment of the output waveform under critical current and heavy load conditions. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the 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.

[0028] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0029] 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 mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0030] Please see Figure 1 , Figure 1 This application provides a schematic diagram of a critical value oscillation control device according to an embodiment. Figure 1As shown, the control device includes: a first operational amplifier 1, a second operational amplifier 2, a comparator 3, a logic control module 4, a DC-DC controller 5, a timing module 6, and a logic processing module 7, wherein...

[0031] The input port of the first operational amplifier 1 is connected to the input port of the second operational amplifier 2. The output port of the first operational amplifier 1 is connected to the first input port of the comparator 3. The output port of the second operational amplifier 2 is connected to the second input port of the comparator 3. The output port of the comparator 3 is connected to the first input port of the logic control module 4. The output port of the logic control module 4 is connected to the input port of the DC-DC controller 5 and the input port of the timing module 6. The output port of the DC-DC controller 5 is connected to the second input port of the logic control module 4 and the first input port of the logic processing module 7. The output port of the timing module 6 is connected to the second input port of the logic processing module 7. The output port of the logic processing module 7 is connected to the third input port of the logic control module 4.

[0032] The logic control module 4 is used to determine the value of the mode switching indication signal according to the working mode of the first operating cycle. The mode switching indication signal is the output signal of the DC-DC controller 5.

[0033] The logic control module 4 is used to determine the overvoltage judgment threshold of the second operating cycle based on the value of the mode conversion indication signal, the type of load current, and the output signal of the logic processing module 7. The second operating cycle is the cycle after the first operating cycle.

[0034] The comparator 3 is used to make an overvoltage judgment within the second operating cycle based on the overvoltage judgment threshold.

[0035] In one possible implementation, such as Figure 1 As shown, the critical value oscillation control device further includes: a first resistor R1 and a second resistor R2, wherein the second end of the first resistor R1 is connected to the first end of the second resistor R2, the input port of the first operational amplifier 1, and the input port of the second operational amplifier 2, the second end of the second resistor R2 is grounded, and the first end of the first resistor R1 is a signal input port.

[0036] In one possible implementation, the logic control module 4 is used to determine the overvoltage judgment threshold for the second operating cycle based on the value of the mode transition indication signal, the type of load current, and the output signal of the logic processing module 7, including:

[0037] The logic control module 4 is used to perform an OR operation based on the value of the mode conversion indication signal, the type of load current, and the output signal of the logic processing module 7 to obtain the calculation result;

[0038] The logic control module 4 is used to determine the overvoltage judgment threshold of the second operating cycle based on the calculation result.

[0039] Specifically, for example, the logic value of the mode switching indicator signal can be 0 or 1. The type of load current is associated with the low-power signal; if the load current is a low-power load current, the logic value of the low-power signal is 1; if the load current is a non-low-power load current, the logic value of the low-power signal is 0. The calculation result includes 0 or 1. If the calculation result is 1, the overvoltage judgment threshold of the second operating cycle is the low-power judgment threshold. If the calculation result is 0, the overvoltage judgment threshold of the second operating cycle is the non-low-power judgment threshold. The difference between the low-power judgment threshold and the non-low-power judgment threshold is usually large; therefore, it can reduce the occurrence of alternating overvoltage judgments using the low-power judgment threshold and the non-low-power judgment threshold, thereby reducing the occurrence of oscillation ripple.

[0040] like Figure 1 The PSM signal shown is a low power indicator signal. A logic value of 1 for the PSM signal indicates that it is in low power mode.

[0041] In one possible implementation, the logic control module 4 is used to determine the value of the mode transition indication signal according to the operating mode of the first operating cycle, including:

[0042] The logic control module 4 is used to determine the value of the mode conversion indication signal as a first value if the working mode of the first operating cycle is PWM working mode.

[0043] If the operating mode of the first operating cycle is PSM operating mode, then the value of the mode conversion indication signal is determined as the second value.

[0044] In one possible implementation, such as Figure 2 As shown, the control device further includes a filtering module, which includes a third resistor R3 and a first capacitor C1. The first end of the third resistor R3 is connected to the input port of the first operational amplifier 1 and the first end of the first capacitor C1. The second end of the third resistor R3 is connected to the second end of the first resistor R1, the first end of the second resistor R2, and the second end of the first capacitor C1.

[0045] In one specific embodiment Figure 3 A basic logic diagram of a logic control module is also provided.

[0046] Wherein, the Comp signal is an output signal of the comparator, the PSM signal is an indication signal of the PSM operation mode, and the PLO signal is a mode conversion indication signal.

[0047] The specific control logic is as follows:

[0048] The Comp comparison circuit judges whether the output of the DCDC is overvoltage, and the overvoltage value is determined by the operation mode judged in the previous cycle. The overvoltage signal sent by the Comp comparison circuit is first sent to the added logic control module. The logic control module actively shields the received first overvoltage signal and judges whether the current mode is the PSM mode. After both conditions are satisfied simultaneously, the overvoltage signal is sent to both the DCDC Controller and the Low Power Timer. The DCDC controller controls the turn-off of the power tube according to the received overvoltage signal. The low power timer starts low power judgment timing according to the received overvoltage signal, and sets the PLOUT low power signal after the timing expires. Wherein, the internal signal PLO is a mode indication signal for judging PWM to PSM conversion by the current sampling circuit in the PWM mode, and PLO = 1 by default under light load. The internal signal PLOUT is a low power signal, which is set to PLOUT = 1 after the low power timing expires. PLO and PLOUT are subjected to an OR operation to obtain the PSM signal, and the PSM signal is returned to the logic control module for the next judgment.

[0049] as shown in Figure 4 , Figure 4 shows an output waveform diagram at critical current.

[0050] In phase ①, it is in the PWM operation mode, but the first overvoltage is shielded, that is, the PLOUT result of phase ① is ignored. At this time, since PLO = 1 by default, PSM = 1, and switching to low power mode is allowed, and the PSM OV threshold is used as the overvoltage judgment in the next cycle ②.

[0051] In phase ②, if a non-low-power load current in Figure 4 occurs, and the count T < Tlp, then PLOUT = 0. However, since PLO = 1, according to the Figure 3 logic, PLO|PLOUT = PSM = 1, the low power condition is still satisfied, and the PSM OV threshold continues to be used as the overvoltage judgment in the next cycle ③. In phase ②, if a non-low-power load current in Figure 4 does not occur, and the count T > Tlp, then PLOUT = 1. At this time, since PLO = 1, according to the Figure 3 logic, PLO|PLOUT = PSM = 1, the low power condition is also satisfied, and the PSM OV threshold also continues to be used as the overvoltage judgment in the next cycle ③.

[0052] Stages ③ and ④ are the same as stages ① and ② above. Therefore, the added logic control module controls the PLO signal to always be 1. After the low power consumption condition is met in a certain cycle, subsequent cycles will use PSM=1, that is, use the PSM OV threshold for overvoltage judgment, thereby maintaining low ripple output and eliminating the "large and small wave" oscillation ripple of the output voltage.

[0053] In the new circuit with the added logic control module, besides eliminating the "large and small wave" oscillation waveforms, it also converts the PWM OV overvoltage threshold based on the PSM-to-PWM signal. Therefore, when the load current increases, reaching a value far exceeding the low-power current and exceeding the current threshold for PSM-to-PWM mode, the current sampling circuit starts working, causing PLO=0 and switching to PWM operating mode. Thereafter, as long as the load current is within the PWM operating range, the output ripple will be judged based on PWM OV overvoltage. Figure 5 As shown in stage ⑤.

[0054] In one possible embodiment, this application also provides a critical value oscillation control device, the control device including a circuit board and a critical value oscillation control apparatus as described in any of the foregoing embodiments.

[0055] In one possible embodiment, this application also provides a wireless headset, the wireless headset including a housing and a critical value oscillation control device as described in the foregoing embodiments.

[0056] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0057] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0058] In the several embodiments provided in this application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical or other forms.

[0059] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0060] Furthermore, the functional units in the various embodiments of the application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software program module.

[0061] If the integrated unit is implemented as a software program module and sold or used as an independent product, it can be stored in a computer-readable storage device (CMD). Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned memory includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0062] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage device, which may include: a flash drive, a read-only memory, a random access memory, a magnetic disk, or an optical disk, etc.

[0063] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A critical value oscillation control device, characterized in that, The control device includes: a first operational amplifier, a second operational amplifier, a comparator, a logic control module, a DC-DC controller, a timing module, and a logic processing module. Wherein, the first input port of the first operational amplifier is connected to the first input port of the second operational amplifier, the output port of the first operational amplifier is connected to the first input port of the comparator, the output port of the second operational amplifier is connected to the second input port of the comparator, the output port of the comparator is connected to the first input port of the logic control module, the output port of the logic control module is connected to the input port of the DC-DC controller and the input port of the timing module, the output port of the DC-DC controller is connected to the second input port of the logic control module and the first input port of the logic processing module, the output port of the timing module is connected to the second input port of the logic processing module, and the output port of the logic processing module is connected to the third input port of the logic control module. in, The logic control module is used to determine the value of the mode switching indication signal according to the working mode of the first operating cycle, wherein the mode switching indication signal is the output signal of the DC-DC controller. The logic control module is used to determine the overvoltage judgment threshold of the second operating cycle based on the value of the mode conversion indication signal, the type of load current, and the output signal of the logic processing module. The second operating cycle is the cycle following the first operating cycle. The type of load current is associated with a low-power signal. The comparator is used to make an overvoltage judgment within the second operating cycle based on the overvoltage judgment threshold.

2. The control device according to claim 1, characterized in that, The control device further includes a first resistor and a second resistor, wherein the second end of the first resistor is connected to the first end of the second resistor, the input port of the first operational amplifier, and the input port of the second operational amplifier, the second end of the second resistor is grounded, and the first end of the first resistor is a signal input port.

3. The control device according to claim 2, characterized in that, The logic control module is used to determine the overvoltage judgment threshold of the second operating cycle based on the value of the mode conversion indication signal, the type of load current, and the output signal of the logic processing module, including: the logic control module is used to perform an OR operation based on the value of the mode conversion indication signal, the type of load current, and the output signal of the logic processing module to obtain the calculation result; The logic control module is used to determine the overvoltage judgment threshold for the second operating cycle based on the calculation result.

4. The control device according to claim 3, characterized in that, The logic control module is used to determine the value of the mode transition indication signal according to the working mode of the first operating cycle, including: The logic control module is used to determine the value of the mode conversion indication signal as a first value if the working mode of the first operating cycle is PWM working mode. If the operating mode of the first operating cycle is PSM operating mode, then the value of the mode conversion indication signal is determined as the second value.

5. The control device according to any one of claims 2 to 4, characterized in that, The control device also includes: The filtering module includes a third resistor and a first capacitor. The first end of the third resistor is connected to the input port of the first operational amplifier and the first end of the first capacitor. The second end of the third resistor is connected to the second end of the first resistor, the first end of the second resistor, and the second end of the first capacitor.

6. A critical value oscillation control device, characterized in that, The critical value oscillation control device includes a circuit board and a critical value oscillation control device as described in any one of claims 1-5.

7. A wireless earphone, characterized in that, The wireless earphone includes a housing and a critical value oscillation control device as described in claim 6.

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