Charging control circuit, charging control method and charging box

Abstract

The present invention discloses a charging control circuit, a charging control method and a charging box, wherein the method receives a charging request signal and controls an output module to output a first charging voltage according to the charging request signal; when a first charging current that changes with the first charging voltage reaches a preset current value, a voltage conversion signal is output to the output module; after the output module outputs a second charging voltage of a preset duration, the output module is controlled to output a third charging voltage; when the second charging current that changes with the third charging voltage reaches a preset current value, the step of returning to: outputting a voltage regulation signal to the output module until the charging voltage output by the output module meets a preset condition and the charging current is a preset current value, the output module is controlled to stop outputting. The present invention adjusts the charging voltage accordingly according to the change of the charging current during the charging process, thereby reducing the loss of the charging voltage during the charging process, thereby improving the power conversion efficiency during the charging process.

Description

Technical Field

[0001] The present invention relates to the field of charging technology, and in particular to a charging control circuit, a charging control method and a charging box. Background Art

[0002] As wireless Bluetooth headset technology matures, TWS (True Wireless Stereo) headsets are favored by consumers. Existing TWS headsets are equipped with batteries to provide the power required for the headset to work, and are usually equipped with a dedicated headset charging box, which can be used to accommodate wireless headsets and provide output voltage to charge the battery of the wireless headset.

[0003] The traditional charging method of wireless earphones is that the battery in the charging box outputs a voltage of a fixed amplitude to charge the battery in the wireless earphones. However, in the above charging method, the power conversion efficiency of the wireless earphone charger circuit is reduced, and the power of the earphone charging box is wasted. Summary of the invention

[0004] The main purpose of the present invention is to provide a charging control circuit, a charging control method and a charging box, aiming to solve the technical problem of low power conversion efficiency of the existing wireless headset charging method.

[0005] To achieve the above object, the present invention provides a charging control circuit, which includes a processing module and an output module;

[0006] The output end of the processing module is connected to the input end of the output module, the first detection end of the processing module is connected to the output end of the output module, and the second detection end of the processing module is connected to the end to be charged;

[0007] The power supply end of the output module is connected to the charging end, and the output end of the output module is also connected to the end to be charged;

[0008] When receiving a charging request signal sent by the end to be charged, the processing module controls the output module to output a corresponding charging voltage according to the charging request signal, and when the charging current that changes with the charging voltage reaches a preset current value, controls the output module to perform voltage step-up / voltage step-down adjustment to realize power supply to the end to be charged.

[0009] Optionally, the charging control circuit further includes a capacitor;

[0010] The first end of the capacitor is connected to the first detection end of the processing module and the power source to be charged, respectively, and the second end of the capacitor is connected to the second detection end of the processing module.

[0011] Optionally, the charging control circuit further includes a resistor;

[0012] The first end of the resistor is connected to the second end of the capacitor, and the second end of the resistor is connected to the second detection end of the processing module.

[0013] In addition, to achieve the above object, the present invention also provides a charging control method, which includes the following steps:

[0014] receiving a charging request signal sent by the end to be charged, and controlling the output module to output a first charging voltage according to the charging request signal;

[0015] When a first charging current that changes with the first charging voltage reaches a preset current value, outputting a voltage transformation signal to the output module, so that the output module outputs a second charging voltage that is transformed from the first charging voltage;

[0016] After the output module outputs the second charging voltage for a preset time, controlling the output module to output a third charging voltage that is obtained by adjusting the second charging voltage;

[0017] When the second charging current that follows the change of the third charging voltage reaches a preset current value, return to step: output a voltage transformation signal to the output module until the charging voltage output by the output module meets the preset conditions and the charging current is the preset current value, and control the output module to stop outputting the voltage transformation signal to the output module, so that the output module outputs a second charging voltage after transforming the first charging voltage.

[0018] Optionally, the step of controlling the output module to output a third charging voltage obtained by adjusting the second charging voltage includes:

[0019] After controlling the output module to output the second charging voltage increasing with a preset first slope for a preset time period, controlling the output module to adjust the second charging voltage to output the third charging voltage.

[0020] Optionally, the step of controlling the output module to adjust the second charging voltage includes:

[0021] The output module is controlled to step down the second charging voltage with a preset second slope until a charging current corresponding to the second charging voltage is zero, and the output module is controlled to step up the second charging voltage with a preset third slope.

[0022] Optionally, the step of controlling the output module to output the first charging voltage according to the charging request signal includes:

[0023] The output module is controlled according to the charging request signal to output a first charging voltage which increases with a preset third slope.

[0024] Optionally, the step of outputting the voltage transformation signal to the output module so that the output module outputs a second charging voltage after transforming the first charging voltage includes:

[0025] A boost signal is output to the output module, so that the output module outputs a second charging voltage whose voltage value is the sum of the voltage value of the first charging voltage and a preset voltage value.

[0026] Optionally, the step of controlling the output module to stop outputting until the charging voltage output by the output module meets a preset condition and the charging current is a preset current value includes:

[0027] until the charging voltage output by the output module reaches a preset limit voltage and the charging current reaches a preset current value, controlling the output module to stop outputting; or

[0028] When the charging voltage output by the output module is the sum of the voltage of the battery at the to-be-charged end and the preset damage voltage and the charging current is the preset current value, the output module is controlled to stop outputting.

[0029] In addition, to achieve the above-mentioned purpose, the present invention also provides a charging box, which includes the charging control circuit as described above, or can implement the charging control method as described above.

[0030] The present invention provides a charging control circuit, a charging control method and a charging box. The method receives a charging request signal and controls an output module to output a first charging voltage according to the charging request signal; when a first charging current that changes with the first charging voltage reaches a preset current value, a voltage conversion signal is output to the output module so that the output module outputs a second charging voltage; after the output module outputs the second charging voltage for a preset time, the output module is controlled to output a third charging voltage; when the second charging current that changes with the third charging voltage reaches a preset current value, the step of returning to: outputting a voltage conversion signal to the output module until the charging voltage output by the output module meets a preset condition and the charging current is a preset current value, the output module is controlled to stop outputting. The present invention adjusts the charging voltage accordingly according to the change of the charging current during the charging process. That is, the charging box in the present invention outputs a nonlinear charging voltage, thereby reducing the loss of the charging voltage during the charging process, thereby improving the power conversion efficiency during the charging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the circuit structure of an embodiment of a charging control circuit of the present invention;

[0032] Figure 2 This is a flow chart of an embodiment of a charging control method of the present invention;

[0033] Figure 3 A schematic diagram of a current and voltage curve during the charging process of an embodiment of a charging control method of the present invention;

[0034] Figure 4 A schematic flow chart of a detailed step of controlling the output module to output a third charging voltage after adjusting the second charging voltage in the charging control method of the present invention;

[0035] Figure 5 The present invention is a schematic flow chart of a detailed step of outputting a boost signal to the output module in the charging control method of the present invention so that the output module outputs a second charging voltage after transforming the first charging voltage.

[0036] 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

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] See also Figure 1 , Figure 1 The circuit structure diagram of an embodiment of the charging control circuit of the present invention is shown in FIG. The charging control circuit includes a processing module and an output module; the output end of the processing module is connected to the input end of the output module, the first detection end of the processing module is connected to the output end of the output module, and the second detection end of the processing module is connected to the end to be charged; the power supply end of the output module is connected to the charging end, and the output end of the output module is also connected to the end to be charged.

[0039] Furthermore, the charging control circuit also includes a capacitor; a first end of the capacitor is respectively connected to a first detection end of the processing module and a power source to be charged, and a second end of the capacitor is connected to a second detection end of the processing module.

[0040] Furthermore, the charging control circuit also includes a resistor; a first end of the resistor is connected to the second end of the capacitor, and a second end of the resistor is connected to the second detection end of the processing module.

[0041] The device to which the charging control method is applied should at least include a processing module and an output module; the output end of the processing module is connected to the input end of the output module, the first detection end of the processing module is connected to the output end of the output module, and the second detection end of the processing module is connected to the end to be charged; the power supply end of the output module is connected to the charging end, and the output end of the output module is also connected to the end to be charged. Preferably, the processing module is set as a microprocessor, and the output module is set as a DC-DC voltage converter. As an optional solution, the device to which the charging control method is applied may also include a resistor and a capacitor, wherein the first end of the capacitor is respectively connected to the first detection end of the processing module and the power supply to be charged, and the second end of the capacitor is connected to the second detection end of the processing module. The first end of the resistor is connected to the second end of the capacitor, and the second end of the resistor is connected to the second detection end of the processing module.

[0042] See also Figure 2 , Figure 2 This is a flow chart of an embodiment of a charging control method of the present invention. The charging control method provided in this embodiment includes the following steps:

[0043] Step S10, receiving a charging request signal sent by the charging terminal, and controlling the output module to output a first charging voltage according to the charging request signal;

[0044] The charging control method provided in this embodiment first receives a charging request signal sent by the charging terminal, and the processing module controls the output voltage of the output module according to the charging request signal. The voltage output by the output module in this process is defined as the first charging voltage. Figure 3 , Figure 3 FIG. 1 is a schematic diagram of a current-voltage curve during the charging process of another embodiment of the charging control method of the present invention. Figure 3 Taking the scenario of charging the charging terminal according to the charging request signal as an example, the maximum value of the battery voltage at the charging terminal is set to 4.2V, the maximum value of the charging current of the battery at the charging terminal is set to 0.1A, and the maximum value of the charging voltage output by the output module is set to 5V. It is easy to understand that the charging voltage output by the output module has an initial voltage value. As an implementation scheme, the initial voltage value is set to 2.8V, that is, after receiving the charging request signal, the output module outputs a charging voltage of 2.8V that increases with time, and this charging voltage is defined as the first charging voltage.

[0045] Step S20, when the first charging current that changes with the first charging voltage reaches a preset current value, outputting a voltage transformation signal to the output module, so that the output module outputs a second charging voltage that is transformed from the first charging voltage;

[0046] When the output module outputs the charging voltage to the end to be charged, it is easy to understand that the charging current output by the output module will also change with the charging voltage, and the current that changes according to the first charging voltage is defined as the first charging current. When the current value of the charging current reaches the preset current value, it indicates that the charging voltage output by the output module is just higher than the battery voltage at the end to be charged. In order to achieve fast charging of the end to be charged, the processing module outputs a boost signal to the output module to control the output module to boost the charging voltage before outputting it. For example, the first charging voltage can be increased by 0.1V, and the boosted charging voltage is defined as the second charging voltage.

[0047] Step S30, after the output module outputs the second charging voltage for a preset time, controlling the output module to output a third charging voltage that is obtained by adjusting the second charging voltage;

[0048] It is easy to understand that, in the process of the output module outputting the second charging voltage, the voltage of the battery at the to-be-charged end also increases with the increasing charging voltage, and the charging current output by the output module tends to be stable. In order to ensure the stability of the subsequent voltage of the battery at the to-be-charged end, in one embodiment, the output module is controlled to adjust the second charging voltage after outputting the increasing second charging voltage for a certain period of time. During the adjustment of the second charging voltage, the charging current of the output module will decrease with the adjustment of the charging voltage. The output module outputs the third charging voltage after adjusting the second charging voltage again, and detects the charging current that changes with the third charging voltage, and defines the charging current as the second charging current.

[0049] Step S40, when the second charging current that follows the change of the third charging voltage reaches a preset current value, return to step: output a voltage transformation signal to the output module until the charging voltage output by the output module meets the preset conditions and the charging current is the preset current value, control the output module to stop output.

[0050] In the above process of adjusting the second charging voltage, if Figure 3 As shown, in the process of adjusting the second charging voltage, the charging current output by the output module will drop to zero. As the output module outputs the third charging voltage, the second charging current corresponding to the third charging voltage will increase accordingly. When the second charging current reaches the preset current value again, in order to achieve fast charging of the charging end, the processing module again outputs a boost signal to the output module.

[0051] Then loop the above steps, from Figure 3It is easy to find that the process from the processing module outputting the boost signal to the charging current reaching the preset current value again is a cycle. In this cycle, the output module outputs a nonlinear charging voltage according to the instructions sent by the processing module. The battery voltage at the end to be charged shows an overall upward trend, and the charging of the end to be charged is achieved. When the charging voltage output by the output module meets the preset conditions and the charging current is the preset current value, that is, the end to be charged is fully charged, the above charging cycle is exited, and the output module is controlled to stop outputting, completing the entire charging process.

[0052] In this embodiment, a specific implementation method may be to first receive a charging request signal sent by the charging terminal, control the output module to output the charging voltage according to the charging request signal, and detect the value of the charging current. When the charging current reaches a preset current value, the charging voltage is boosted. It is easy to understand that the charging current also increases with the charging voltage. After the charging current reaches the maximum current value, for example, Figure 3 The 0.1A in is the maximum current value of the charging current. The charging voltage is adjusted again so that the charging current is output at a fixed maximum current value. After the charging current is output at the maximum current value for a preset period of time, the charging voltage is stepped down, and the change of the charging current during the step-down process is detected. After the charging current drops to zero for a period of time, the charging voltage is stepped up to increase the current. When the current reaches the preset current value again, the process of stepping up and down the charging voltage is repeated until the voltage value of the charging voltage is the sum of the charging terminal voltage and the preset voltage value. The charging voltage is controlled to be output at this voltage value, and the charging current is detected in real time. When the charging current reaches the preset current value, it indicates that the terminal to be charged is full, and the output module is controlled to stop outputting. It can be seen from this embodiment that during the entire charging process, the charging voltage is adjusted according to the change of the charging current. That is to say, the output module in this embodiment outputs a nonlinear charging voltage, thereby reducing the loss of the charging voltage during the charging process, thereby improving the power conversion efficiency during the charging process.

[0053] For further information, see Figure 4 , Figure 4 The step of controlling the output module to output the third charging voltage after adjusting the second charging voltage in the charging control method of the present invention is a detailed flow chart. The step of controlling the output module to output the third charging voltage after adjusting the second charging voltage includes:

[0054] Step S31, after controlling the output module to output the second charging voltage that increases with a preset first slope for a preset time period, controlling the output module to adjust the second charging voltage to output the third charging voltage.

[0055] In this embodiment, during the process of the output module outputting the second charging voltage, the second charging voltage with a preset duration that increases with the output time is first output, and then the second charging voltage is adjusted to output the third charging voltage. It is easy to understand that in this embodiment, a first slope is also preset, and the second charging voltage can be set to increase with the first slope within a preset duration. The specific value of the first slope is related to the battery capacity at the end to be charged and the maximum charging current, and this embodiment does not make specific restrictions. The specific value of the preset duration in this embodiment is also determined by the user.

[0056] After the output module outputs the first charging voltage to obtain the second charging voltage, the second charging voltage is not immediately adjusted to obtain the third charging voltage, but the second charging voltage of a preset duration is first output to realize power supply to the charging terminal.

[0057] Furthermore, the step of controlling the output module to adjust the second charging voltage includes:

[0058] Step S311, controlling the output module to step down the second charging voltage with a preset second slope until the charging current corresponding to the second charging voltage is zero, and then controlling the output module to step up the second charging voltage with a preset third slope.

[0059] After the output module outputs the second charging voltage for a preset time, the processing module controls the output module to step down the second charging voltage. It is easy to understand that as the charging voltage decreases, the current value of the charging current also decreases until the charging current corresponding to the second charging voltage is zero. At this time, no current flows from the charging end to the end to be charged. Then the output module is controlled to step up the second charging voltage. In this case, the charging current also increases. As an implementation scheme, the second slope and the third slope are pre-set in this embodiment, and the processing module is set to step down the second charging voltage with the second slope, and the processing module is set to step up the second charging voltage with the third slope; preferably, the third slope is set to 0.1-0.3V / S, that is, the second charging voltage increases by a voltage amplitude of 0.1V-0.3V per second.

[0060] After the output module outputs the second charging voltage to charge the end to be charged for a period of time, in order to improve the voltage conversion efficiency and avoid voltage waste caused by outputting the voltage of a fixed load, the output module is controlled to step down the second charging voltage until the charging current is zero. Then the output module is controlled again to output an increasing charging voltage to supply power to the end to be charged, ensuring that the voltage amplitude of the charging voltage and the voltage amplitude of the battery at the end to be charged are within a certain difference range, thereby avoiding waste of charging voltage.

[0061] Further, the step of controlling the output module to output the first charging voltage according to the charging request signal includes:

[0062] Step S11 , controlling the output module to output a first charging voltage that increases with a preset third slope according to the charging request signal.

[0063] After receiving the charging request signal sent by the end to be charged, the processing module controls the output module to output the first charging voltage. Specifically, the output module can be set to output the first charging voltage in an increasing manner with a third slope. By outputting the increasing first charging voltage, power is supplied to the end to be charged.

[0064] For further information, see Figure 5 , Figure 5 The present invention is a schematic diagram of a detailed flow chart of the step of outputting a voltage transformation signal to the output module in the charging control method of the present invention so that the output module outputs a second charging voltage after the first charging voltage is transformed. The step of outputting a voltage transformation signal to the output module so that the output module outputs a second charging voltage after the first charging voltage is transformed includes:

[0065] Step S21 , outputting a boost signal to the output module, so that the output module outputs a second charging voltage whose voltage value is the sum of the voltage value of the first charging voltage and a preset voltage value.

[0066] In this embodiment, a voltage value is also preset. After the output module receives the boost signal, the first charging voltage is boosted to obtain a second charging voltage, and the second charging voltage is output. Specifically, the preset voltage value can be set to 0.1V. For example, when the output module receives the boost signal, the output first charging voltage is 3V, then the output module boosts the first charging voltage to 3.1V and outputs it externally.

[0067] Furthermore, the step of controlling the output module to stop outputting until the charging voltage output by the output module meets a preset condition comprises:

[0068] Step S41, until the charging voltage output by the output module reaches a preset limit voltage and the charging current is a preset current value, controlling the output module to stop output; or

[0069] Step S42, until the charging voltage output by the output module is the sum of the voltage of the battery to be charged and the preset damage voltage and the charging current is the preset current value, control the output module to stop outputting.

[0070] In this embodiment, when the end to be charged is fully charged, the output module can be controlled to stop outputting and end charging. In one case, a limiting voltage is pre-set in this embodiment. The limiting voltage is the maximum voltage that the output module can output. Figure 3 , the limiting voltage is preferably 5V. When the charging voltage output by the output module is 5V, the charging voltage is controlled to be output at 5V, and the charging current is detected in real time. When the charging current reaches the preset current value, it indicates that the end to be charged is full, and the output module is controlled to stop outputting and charging is terminated. In another case, a damage voltage is pre-set in this embodiment. The damage voltage needs to be set according to the impedance of the line and the voltage loss of the components during the charging process of the end to be charged. When the charging voltage is the sum of the battery voltage at the end to be charged and the preset damage voltage, the charging voltage is controlled to be output at this voltage value, and the charging current is detected in real time. When the charging current reaches the preset current value, it indicates that the end to be charged is full, and the output module is controlled to stop outputting and charging is terminated. It should be noted that the processing module will detect the battery voltage at the end to be charged at a certain interval, and will not detect the battery voltage at the end to be charged in real time.

[0071] This embodiment defines the conditions for the output module to stop outputting and end the charging process in the above manner, thereby preventing the output module from outputting excessive charging voltage and causing loss to the charging terminal.

[0072] In addition, an embodiment of the present invention further proposes a charging box, which is configured as a charging control circuit as described above, or can implement the charging control method as described above.

[0073] The specific embodiments of the charging box of the present invention are basically the same as the embodiments of the above-mentioned charging control method, and will not be described here in detail.

[0074] 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 "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0075] 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.

[0076] 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, or 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, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0077] 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 charging control method, characterized in that: The following steps are involved: receiving a charging request signal sent by the end to be charged, and controlling the output module to output a first charging voltage according to the charging request signal; When a first charging current that changes with the first charging voltage reaches a preset current value, outputting a voltage transformation signal to the output module, so that the output module outputs a second charging voltage that is transformed from the first charging voltage; After the output module outputs the second charging voltage for a preset time, controlling the output module to output a third charging voltage that is obtained by adjusting the second charging voltage; When the second charging current that follows the change of the third charging voltage reaches a preset current value, return to step: output a voltage transformation signal to the output module until the charging voltage output by the output module meets the preset conditions and the charging current is the preset current value, and control the output module to stop output.

2. The charging control method according to claim 1, characterized in that: The step of controlling the output module to output a third charging voltage that is obtained by adjusting the second charging voltage comprises: After controlling the output module to output the second charging voltage increasing with a preset first slope for a preset time period, controlling the output module to adjust the second charging voltage to output the third charging voltage.

3. The charging control method according to claim 2, characterized in that: The step of controlling the output module to adjust the second charging voltage includes: The output module is controlled to step down the second charging voltage with a preset second slope until a charging current corresponding to the second charging voltage is zero, and the output module is controlled to step up the second charging voltage with a preset third slope.

4. The charging control method according to claim 1, characterized in that: The step of controlling the output module to output the first charging voltage according to the charging request signal comprises: The output module is controlled according to the charging request signal to output a first charging voltage which increases with a preset third slope.

5. The charging control method according to claim 1, characterized in that: The step of outputting the voltage transformation signal to the output module so that the output module outputs a second charging voltage after transforming the first charging voltage comprises: A boost signal is output to the output module, so that the output module outputs a second charging voltage whose voltage value is the sum of the voltage value of the first charging voltage and a preset voltage value.

6. The charging control method according to claim 1, characterized in that: The step of controlling the output module to stop outputting until the charging voltage output by the output module meets a preset condition and the charging current is a preset current value comprises: until the charging voltage output by the output module reaches a preset limit voltage and the charging current reaches a preset current value, controlling the output module to stop outputting; or When the charging voltage output by the output module is the sum of the voltage of the battery at the to-be-charged end and the preset damage voltage and the charging current is the preset current value, the output module is controlled to stop outputting.

7. A charging control circuit, characterized in that: The charging control circuit applies the charging control method as claimed in claim 1, and the charging control circuit includes a processing module and an output module; The output end of the processing module is connected to the input end of the output module, the first detection end of the processing module is connected to the output end of the output module, and the second detection end of the processing module is connected to the end to be charged; The power supply end of the output module is connected to the charging end, and the output end of the output module is also connected to the end to be charged; When receiving a charging request signal sent by the end to be charged, the processing module controls the output module to output a corresponding charging voltage according to the charging request signal, and when the charging current that changes with the charging voltage reaches a preset current value, controls the output module to perform voltage step-up / voltage step-down adjustment to realize power supply to the end to be charged.

8. The charging control circuit according to claim 7, characterized in that: The charging control circuit also includes a capacitor; The first end of the capacitor is connected to the first detection end of the processing module and the end to be charged respectively, and the second end of the capacitor is connected to the second detection end of the processing module.

9. The charging control circuit according to claim 8, characterized in that: The charging control circuit also includes a resistor; The first end of the resistor is connected to the second end of the capacitor, and the second end of the resistor is connected to the second detection end of the processing module.

10. A charging box, characterized in that: The charging box can implement the charging control method as described in any one of claims 1 to 6, or include the charging control circuit as described in any one of claims 7 to 8.

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