Signal transmission control method, mode selection method, transmitting module and system

Abstract

The application provides a signal transmission control method, a mode selection method, a transmitting module and a system, and relates to the technical field of signal transmission. The method comprises the following steps: a control unit selects a target control mode from a first control mode and a second control mode according to the working state of the transmitting module; when the first control mode is selected as the target control mode, the working period of a control signal is synchronously changed by adjusting the working period of the control signal every time the second driving signal jumps, so as to reduce the electromagnetic interference of the transmitting coil; when the second control mode is selected as the target control mode, one control signal is maintained at a low level, and the other control signal is switched to a low level when the coil current is greater than a first current threshold value and is switched to a high level when the coil current is less than a second current threshold value, so as to realize rapid control of the coil current. The application can improve the working compatibility of the transmitting module.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of signal transmission, in particular to a signal transmission control method, a mode selection method, a transmitting module and a system. BACKGROUND

[0002] In a signal transmission system, a transmitting module (Tx) generates a coil current signal through full-bridge control, and the coil current signal is coupled to a receiving module (Rx) through a coil, so as to realize energy transmission and signal transmission from the transmitting module to the receiving module.

[0003] In the prior art, the transmitting module and the receiving module can only use a fixed signal transmission method for signal transmission during signal transmission, so that the transmitting module cannot adjust the signal transmission mode from the transmitting module to the receiving module according to the actual working state of the transmitting module, and the scene compatibility of the entire transmitting module is not good enough. SUMMARY

[0004] The present application aims at the deficiencies in the prior art, and provides a signal transmission control method, a mode selection method, a transmitting module and a system, so as to adjust the signal transmission mode of the transmitting module according to the actual working state of the transmitting module, and improve the working compatibility of the transmitting module.

[0005] To achieve the above-mentioned purpose, the technical solutions adopted by the embodiments of the present application are as follows:

[0006] In a first aspect, the embodiments of the present application provide a signal transmission control method applied to a transmitting module in a signal transmission system, wherein the transmitting module comprises a control unit, a full-bridge power unit, a transmitting coil and a current detection unit, wherein the transmitting coil is connected between the midpoints of two bridge arms of the full-bridge power unit, and the current sampling point of the transmitting coil is connected with the control unit through the current detection unit; the method comprises the following steps:

[0007] generating and outputting two control signals according to two driving signals by the control unit, and controlling the full-bridge power unit to make the transmitting coil generate a coil current according to the two control signals; wherein the frequency of the two control signals is higher than that of the two driving signals, and the duty cycle of the two control signals is different; when the level value of the first driving signal is valid, the working period of the two control signals changes once for each jump of the second driving signal;

[0008] outputting an overcurrent signal to the control unit when the current detection unit detects that the transmitting coil has an overcurrent condition;

[0009] The control unit switches duty cycle of the two control signals according to the overcurrent signal, and reduces the coil current according to the switched two control signals, so as to adjust the signal to be transmitted.

[0010] Optionally, the generating and outputting of the two control signals by the control unit according to the two drive signals comprises:

[0011] The control unit generates and outputs the two control signals when the level value of the first drive signal is valid and the second drive signal is low, wherein the duty cycle of the first control signal is greater than that of the second control signal.

[0012] Optionally, the generating and outputting of the two control signals by the control unit when the level value of the first drive signal is valid and the second drive signal is low comprises:

[0013] The control unit generates and outputs the two control signals according to different working periods within a plurality of time periods when the level value of the first drive signal is valid and the second drive signal is low.

[0014] Optionally, the generating and outputting of the two control signals by the control unit according to the two drive signals comprises:

[0015] The control unit generates and outputs the two control signals when the level value of the first drive signal is valid and the second drive signal is high, wherein the duty cycle of the first control signal is less than that of the second control signal.

[0016] Optionally, the generating and outputting of the two control signals by the control unit when the level value of the first drive signal is valid and the second drive signal is high comprises:

[0017] The control unit generates and outputs the two control signals according to different working periods within a plurality of time periods when the level value of the first drive signal is valid and the second drive signal is high.

[0018] In a second aspect, the embodiments of the present application further provide another signal transmission control method, which is applied to a transmitting module in a signal transmission system, the transmitting module comprising a control unit, a full-bridge power unit, a transmitting coil, and a current detection unit, wherein the transmitting coil is connected between the midpoints of two bridge arms of the full-bridge power unit, and a current sampling point of the transmitting coil is connected to the control unit through the current detection unit; the method comprises:

[0019] The control unit generates and outputs two control signals according to the two driving signals, and controls the full-bridge power unit to make the transmitting coil generate a coil current according to the two control signals, wherein when the level value of the first driving signal is effective, the initial level of the two control signals is switched once every time the second driving signal jumps;

[0020] The current detection unit detects that the coil current is greater than a first current threshold, and outputs an overcurrent signal to the control unit;

[0021] The control unit controls the high-level control signal to jump to low level according to the overcurrent signal, maintains the level of the low-level control signal unchanged, and controls the full-bridge power unit to reduce the coil current according to the new two control signals to adjust the signal to be transmitted;

[0022] The current detection unit detects that the coil current decreases to below a second current threshold, and outputs an undercurrent signal to the control unit;

[0023] The control unit controls the control signal jumping to low level to jump to high level again according to the undercurrent signal, maintains the low-level control signal to maintain low level, and controls the full-bridge power unit to increase the coil current according to the new two control signals to adjust the signal to be transmitted again.

[0024] Optionally, when the level value of the first driving signal is effective and the second driving signal is low level, the first control signal in the two control signals is high level and the second control signal is low level, and the control unit controls the high-level control signal to jump to low level according to the overcurrent signal, and the level of the low-level control signal is maintained unchanged, comprising:

[0025] The control unit controls the first control signal to jump to low level according to the overcurrent signal, and the second control signal maintains low level;

[0026] The control unit controls the control signal jumping to low level to jump to high level again according to the undercurrent signal, and the low-level control signal maintains low level, comprising:

[0027] The control unit controls the first control signal to jump to high level again according to the undercurrent signal, and the second control signal maintains low level.

[0028] Optionally, when the level of the first drive signal is valid and the second drive signal is high, the first control signal of the two control signals is low and the second control signal is high, the control unit controls the high-level control signal to jump to low level according to the overcurrent signal, and the level of the low-level control signal remains unchanged, comprising:

[0029] the control unit controls the second control signal to jump to low level according to the overcurrent signal, and the first control signal remains low level;

[0030] the control signal controlled by the control unit to jump to low level according to the undercurrent signal jumps to high level again, and the control signal remaining low level remains low level, comprising:

[0031] the control unit controls the second control signal to jump to high level again according to the undercurrent signal, and the first control signal remains low level.

[0032] In a third aspect, the embodiments of the present application further provide a signal transmission control mode selection method, applied to a control unit in a transmitting module, the transmitting module comprising: a control unit, a full-bridge power unit, a transmitting coil, and a current detection unit, wherein the transmitting coil is connected between the midpoints of two bridge arms of the full-bridge power unit, and a current sampling point of the transmitting coil is connected through the current detection unit and the control unit; the signal transmission control mode comprises: a first control mode and a second control mode; the method comprises:

[0033] the control unit selects a target control mode from the first control mode and the second control mode according to the working state of the transmitting module;

[0034] When the target control mode is the first control mode, the control unit is configured to execute any one of the signal transmission control methods of the first aspect; when the target control mode is the second control mode, the control unit is configured to execute any one of the signal transmission control methods of the second aspect.

[0035] In a fourth aspect, the embodiments of the present application further provide a transmitting module, comprising: a control unit, a full-bridge power unit, a transmitting coil, and a current detection unit, wherein the transmitting coil is connected between the midpoints of two bridge arms of the full-bridge power unit, and a current sampling point of the transmitting coil is connected through the current detection unit and the control unit; the transmitting module is configured to execute any one of the signal transmission control methods of the first aspect or any one of the signal transmission control methods of the second aspect.

[0036] In a fifth aspect, the embodiments of the present application further provide a signal transmission system, comprising a receiving module and the transmitting module as described in the fourth aspect.

[0037] The present application has the following advantages:

[0038] The present application provides a signal transmission control method, a mode selection method, a transmitting module and a system, wherein two control modes are provided to perform two transmission control methods respectively, one of which can reduce electromagnetic interference in the signal transmission process, and the other of which can quickly respond to the change of the coil current in the transmitting coil to adjust the coil current and ensure stable signal transmission. The mode selection method selects a target transmission control method according to the working state of the transmitting module, thereby improving the working compatibility of the transmitting coil. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0040] Figure 1 A structural schematic diagram of a transmitting module provided by the embodiments of the present application;

[0041] Figure 2 A circuit schematic diagram of a transmitting module provided by the embodiments of the present application;

[0042] Figure 3 A waveform diagram of a traditional full-bridge driving control signal;

[0043] Figure 4 A schematic diagram of selecting a signal transmission control mode provided by the embodiments of the present application;

[0044] Figure 5 A flow schematic diagram of a signal transmission control method provided by the embodiments of the present application;

[0045] Figure 6 A flow schematic diagram of another signal transmission control method provided by the embodiments of the present application;

[0046] Figure 7 A waveform schematic diagram of a first control signal provided by the embodiments of the present application;

[0047] Figure 8 A flow schematic diagram of another signal transmission control method provided by the embodiments of the present application;

[0048] Figure 9 a waveform diagram of a third control signal provided by an embodiment of the present application;

[0049] Figure 10 a waveform diagram of a third control signal provided by an embodiment of the present application;

[0050] Figure 11 a flowchart of another signal transmission control method provided by an embodiment of the present application;

[0051] Figure 12 a waveform diagram of a fourth control signal provided by an embodiment of the present application;

[0052] Figure 13 a waveform diagram of a fifth control signal provided by an embodiment of the present application;

[0053] Figure 14 a waveform diagram of a sixth control signal provided by an embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0055] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0056] In the description of the present application, it should be noted that if the terms "upper", "lower", etc. indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0057] Moreover, the terms "first", "second", and the like, in the description and in the claims of the present application are used for distinguishing between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the use of such terms can be interchanged, in whole or in part, under appropriate circumstances such that the description is directed to an embodiment, and the like, of the application. Furthermore, the terms "comprise", "comprising", "include", "including", and the like, as used herein, are specifically intended to be construed as open-ended terms (i.e., the terms do not exclude additional, unrecited elements). By the expression "comprises... unlisted features", it is meant where the word "comprises" is used in the description and in the claims of the present application that it does not, under any circumstances, imply that additional unrecited elements are essential, or even relevant, to the application. For a clearer apprehension of the application, we will give a more specific description in the following embodiments. It will be appreciated that single features of the embodiments can be combined with features of other embodiments, unless specifically stated otherwise, and that all feature combinations do not necessarily have to be tested, but can also be subject to further refinements.

[0058] It should be noted that the features of the embodiments of the present application can be combined with each other without conflict.

[0059] Reference will be made to Figure 1 A structure schematic diagram of a transmitting module provided by the embodiment of the present application is shown in Figure 1 The transmitting module comprises a control unit 11, a full-bridge power unit 12, a transmitting coil 13, and a current detection unit 14.

[0060] The control unit 11 is connected to the control end of the full-bridge power unit 12, the transmitting coil 13 is connected between the midpoints of the two bridge arms of the full-bridge power unit 12, the current sampling point of the transmitting coil 13 is connected through the current detection unit 14 and the control unit 11, and the current sampling point of the transmitting coil 13 is the bridge arm midpoint of the two bridge arms of the full-bridge power unit 12.

[0061] In a possible implementation, reference is made to Figure 2 A circuit principle diagram of a transmitting module provided by the embodiment of the present application is shown in Figure 2 The control unit 11 comprises a pulse modulation controller 111, a drive controller 112, and a following controller 113, the pulse modulation controller 111 is used for receiving drive signals drv0 and drv1, and generating control signals PWM1 and PWM2 according to the drive signals drv0 and drv1, the drive controller 112 is connected with the pulse modulation controller 111, to generate switch signals PWM_H1 and PWM_L1 according to the control signal PWM1, and generate switch signals PWM_H2 and PWM_L2 according to the control signal PWM2, and the following controller 113 sends four switch signals to the control end of the full-bridge power unit 12.

[0062] The full-bridge power unit 12 includes one bridge arm composed of power switch tubes FET_H1 and FET_L1 and another bridge arm composed of power switch tubes FET_H2 and FET_L2, the midpoint of the bridge arm composed of power switch tubes FET_H1 and FET_L1 is AC1, and the midpoint of the bridge arm composed of power switch tubes FET_H2 and FET_L2 is AC2; one end of the transmitting coil L0 is connected to the midpoint AC1 of the bridge arm, the other end of the transmitting coil L0 is connected to the midpoint AC2 of the bridge arm through the capacitor C0, and the switch S0 is connected in parallel across the capacitor C0.

[0063] One end of the capacitor C1 is connected to the emitter of the power switch tube FET_H1, the other end of the capacitor C1 is connected to the power supply end of the corresponding follow-up controller 113 of the power switch tube FET_H1, one end of the capacitor C2 is connected to the emitter of the power switch tube FET_H2, and the other end of the capacitor C2 is connected to the power supply end of the corresponding follow-up controller 113 of the power switch tube FET_H2; in the case that the power switch tube FET_H1 is turned on, the capacitor C1 supplies power to the power supply end of the corresponding follow-up controller 113 of the power switch tube FET_H1 according to the source voltage of the power switch tube FET_H1, and in the case that the power switch tube FET_H2 is turned on, the capacitor C2 supplies power to the power supply end of the corresponding follow-up controller 113 of the power switch tube FET_H2 according to the source voltage of the power switch tube FET_H2.

[0064] The source of the power switch tube FET_L1 serves as a first current sampling point of the transmitting coil, the source of the power switch tube FET_L2 serves as a second current sampling point of the transmitting coil, and the two sampling input ends of the current detection unit 14 are respectively connected to the two current sampling points to detect the current of the first current sampling point or the second current sampling point; the output end of the current detection unit 14 is connected to the control end of the pulse modulation controller 111 to output an overcurrent signal to the pulse modulation controller 111.

[0065] In a specific implementation, the switch S0 and the capacitor C0 can also not be used, and the transmitting coil L0 is directly connected between the bridge arm midpoints AC1 and AC2; when the transmitting module needs to be compatible with the application scenario of wireless charging, the switch S0 and the capacitor C0 in parallel can be added between the transmitting coil L0 and the bridge arm midpoint AC2, as shown in Figure 2 When the switch S0 is opened, the transmitting module is used to implement energy transmission, that is, the transmitting module is used to implement wireless charging; when the switch S0 is closed, the transmitting module is used to implement signal transmission.

[0066] In the process of signal transmission of the transmitting module and the receiving module, when the transmitting coil has electromagnetic interference in the process of signal transmission, it is necessary to reduce the electromagnetic interference through a signal transmission method; and when there is no electromagnetic interference, it is necessary to quickly respond to the change of the coil current to ensure stable signal transmission. However, in the existing signal transmission control method, the two modes cannot be compatible, resulting in the inability to select the best signal transmission control method according to the working state of the transmitting module.

[0067] Based on this, the embodiment of the present application provides a signal transmission control mode selection method, which is applied to a control unit 11 in a transmitting module. Please refer to Figure 4 A schematic diagram for selecting a signal transmission control mode is provided for the embodiment of the present application, as shown in Figure 4 The signal transmission control mode includes: a first control mode and a second control mode; and the method includes: selecting a target control mode from the first control mode and the second control mode according to the working state of the transmitting module by the control unit.

[0068] When the electromagnetic interference of the transmitting module is too large, the control unit can preferentially select the first control mode, the control unit executes the signal transmission method corresponding to the first control mode, and reduces the electromagnetic interference in the process of signal transmission by changing the working period of the control signal. When the electromagnetic interference of the transmitting module is small, the control unit can preferentially select the second control mode, the control unit executes the signal transmission method corresponding to the second control mode, and adjusts the control signal in time according to the size of the coil current, so that the control signal immediately adjusts the coil current when the coil current is overcurrent or undercurrent, realizes faster current control, and ensures the stability of signal transmission.

[0069] It should be noted that the selection of the target control mode can be selected by the user, when the electromagnetic interference is too large, the user can preferentially select the first control mode, when the electromagnetic interference is small, the user can preferentially select the second control mode, and after the user selects the target control mode through the signal sending device where the transmitting module is located, the control unit can receive the selection instruction of the target control mode to determine the target control mode according to the selection instruction.

[0070] Further, an electromagnetic interference detection device can also be provided in the signal sending device, so that when the electromagnetic interference detection device detects that the electromagnetic interference on the transmitting module is too large, the electromagnetic interference signal is sent to the control unit, so that the control unit can preferentially select the first control mode according to the electromagnetic interference signal, and when the electromagnetic interference is small, the electromagnetic interference signal is stopped to the control unit, so that the control unit can preferentially select the second control mode.

[0071] Based on Figure 2 The transmitting module is shown in the figure, and the existing signal transmission control method is described. Please refer to Figure 3As shown in a waveform diagram of a traditional full-bridge driving control signal, Figure 3 In a time period when the value of the driving signal remains unchanged, the control signal PWM1 or the control signal PWM2 is continuously in a high level state, resulting in a long on time of the switch in the full-bridge power unit 12, and the current flowing through the transmitting coil L0 is only determined by the DC resistance of the transmitting coil L0 and the switch S0, and the coil current cannot be flexibly controlled. In addition, since the on time of the power switch FET_H1 and the power switch FET_H2 in the full-bridge power unit 12 is relatively long, the capacitors C1 and C2 need to support the corresponding time, which limits the application range of the control unit and the capacitors C1 and C2. In addition, since the period of the control signals PWM1 and PWM2 remains unchanged, the frequency of the control signals is fixed, which may cause electromagnetic interference problem in the signal transmission process and affect the stable transmission of the signals.

[0072] Based on this, for the transmitting module as shown in Figure 1 and Figure 2 The present application provides a signal transmission control method, which changes the period of the driving signal to change the frequency of the control signal, so as to reduce the electromagnetic interference in the signal transmission process and improve the stability of the signal transmission.

[0073] Based on the transmitting module provided in the above embodiment, the present application provides a signal transmission control method applied to the transmitting module, which is a first control mode. Please refer to Figure 5 A flowchart of a signal transmission control method provided in the present application is shown in Figure 5 The method comprises the following steps.

[0074] S10: generating and outputting two control signals by the control unit according to two driving signals, and controlling the full-bridge power unit to generate a coil current in the transmitting coil according to the two control signals.

[0075] In the present embodiment, the two driving signals drv0 and drv1 received by the pulse modulation controller 111 in the control unit 11 are preset waveforms, wherein, when the first driving signal drv0 and the second driving signal drv1 are both in a low level, the transmitting module is in a non-working state; when the first driving signal drv0 is in a high level, i.e., the level value is valid, and the second driving signal drv1 switches between a high level and a low level, the transmitting module is in a working state. In the working state of the transmitting module, the level value of the first driving signal drv0 is continuously valid, and the second driving signal drv1 jumps between a high level and a low level. The direction of the coil current on the transmitting coil changes once every time the second driving signal drv1 jumps.

[0076] The pulse modulation controller 111 generates two control signals PWM1 and PWM2 according to the received first driving signal drv0 and second driving signal drv1, the frequency of the two control signals is higher than the frequency of the two driving signals, and the duty cycle of the two control signals is different. The driving controller 112 in the control unit 11 generates switch signals PWM_H1 and PWM_L1 according to the control signal PWM1, and generates switch signals PWM_H2 and PWM_L2 according to the control signal PWM2, and controls the on or off of the power switch tubes FET_H1, FET_L1, FET_H2 and FET_L2 through the switch signals PWM_H1, PWM_L1, PWM_H2 and PWM_L2, so that the bridge arm midpoint AC1 and the bridge arm midpoint AC2 form a voltage difference, to generate a coil current on the transmitting coil. The transmitting module can send the to-be-transmitted signal through the coil current, and receive the to-be-transmitted signal through the receiving coil in the receiving module, so as to realize the signal transmission between the device where the transmitting module is located and the device where the receiving module is located.

[0077] S20: When the current detection unit detects that the transmitting coil has an overcurrent condition, an overcurrent signal is output to the control unit.

[0078] In this embodiment, the current detection unit 14 detects the current at the first current sampling point or the second current sampling point, and outputs an overcurrent signal to the control unit when an overcurrent condition is detected.

[0079] When the voltage of the bridge arm midpoint AC1 is greater than the voltage of the bridge arm midpoint AC2, a coil current from the bridge arm midpoint AC1 to the bridge arm midpoint AC2 is generated on the transmitting coil, and the current detection unit 14 detects the current at the second current sampling point.

[0080] When the voltage of the bridge arm midpoint AC1 is less than the voltage of the bridge arm midpoint AC2, a coil current from the bridge arm midpoint AC2 to the bridge arm midpoint AC1 is generated on the transmitting coil, and the current detection unit 14 detects the current at the first current sampling point.

[0081] S30: The control unit switches the duty cycle size of the two control signals according to the overcurrent signal, and reduces the coil current according to the switched two control signals, to adjust the to-be-transmitted signal.

[0082] In the embodiment, the pulse modulation controller 111 switches the duty ratio size relationship of the control signals PWM1 and PWM2 according to the overcurrent signal, the driving controller 112 regenerates the switching signals PWM_H1 and PWM_L1 according to the switched control signal PWM1, and generates the switching signals PWM_H2 and PWM_L2 according to the switched control signal PWM2, and controls the power switching tubes FET_H1, FET_L1, FET_H2 and FET_L2 through the switching signals PWM_H1, PWM_L1, PWM_H2 and PWM_L2 respectively, changes the voltage formed by the bridge arm midpoints AC1 and AC2, and reduces the coil current.

[0083] When the level value of the first driving signal drv0 is maintained to be valid, and when the second driving signal drv1 jumps once, the pulse modulation controller 111 synchronously changes the period of the control signals PWM1 and PWM2 once to realize the change of the frequency of the control signals PWM1 and PWM2.

[0084] The transmitting module executes the processes of S10-S30 in the time period before the jump of the second driving signal drv1 and in the time period after the jump of the second driving signal drv1, and the periods of the control signals PWM1 and PWM2 are different in the time period before the jump of the second driving signal drv1 and in the time period after the jump of the second driving signal drv1.

[0085] The signal transmission control method provided in the above embodiment generates two high-frequency control signals according to two low-frequency driving signals to control the coil current generated by the transmitting coil, changes the duty ratio size of the two control signals according to the overcurrent signal when the overcurrent of the transmitting coil is detected, reduces the duty ratio of the control signal with large duty ratio, increases the duty ratio of the control signal with small duty ratio, and reduces the current of the transmitting coil, thereby realizing flexible control of the coil current of the transmitting coil. When the level value of one driving signal is maintained to be valid and the level value of the other driving signal jumps once, the working period of the two control signals is synchronously changed once, so that the period of the two control signals changes when the transmitting module works, thereby changing the working frequency of the two control signals. By using control signals with different frequencies to control the transmitting module in the signal transmission process, the electromagnetic interference in the signal transmission process can be effectively improved.

[0086] On the basis of the above embodiment, another signal transmission control method is further provided in the embodiment of the application. Please refer to Figure 6 The flowchart of another signal transmission control method provided in the embodiment of the application is shown in Figure 6 In the above embodiment, the control unit generates and outputs two control signals according to two driving signals in S10, which can include the following steps.

[0087] S11: generating and outputting two control signals by the control unit when the level value of the first driving signal is valid and the second driving signal is low, wherein the duty cycle of the first control signal is greater than the duty cycle of the second control signal.

[0088] In the embodiment, please refer to Figure 7 , which is a waveform diagram of the first control signal provided by the embodiment of the application, as Figure 7 shown, when the first driving signal drv0 is high and the second driving signal drv1 is low, the pulse modulation controller 111 generates the first control signal PWM1 and the second control signal PWM2 according to the first driving signal drv0 and the second driving signal drv1, the duty cycle of the first control signal PWM1 is greater than the duty cycle of the second control signal PWM2, the driving controller 112 generates two complementary switching signals PWM_H1 and PWM_L1 according to the first control signal PWM1, controls the power switch FET_H1 to be turned on or turned off according to the switching signal PWM_H1, and controls the power switch FET_L1 to be turned on or turned off according to the switching signal PWM_L1; the driving controller 112 generates two complementary switching signals PWM_H2 and PWM_L2 according to the second control signal PWM2, controls the power switch FET_H2 to be turned on or turned off according to the switching signal PWM_H2, and controls the power switch FET_L2 to be turned on or turned off according to the switching signal PWM_L2. Since the duty cycle of the first control signal PWM1 is greater than the duty cycle of the second control signal PWM2, a current from the bridge arm midpoint AC1 to the bridge arm midpoint AC2 is formed on the transmitting coil.

[0089] When the coil current exceeds the current threshold, the current detection unit generates an overcurrent signal IOC2, and the pulse modulation controller 111 switches the duty cycle of the two control signals according to the overcurrent signal IOC2, so that the duty cycle of the first control signal PWM1 is less than the duty cycle of the second control signal PWM2, a voltage from the bridge arm midpoint AC2 to the bridge arm midpoint AC1 is formed on the transmitting coil, and the current from the bridge arm midpoint AC1 to the bridge arm midpoint AC2 on the transmitting coil is reduced.

[0090] It should be noted that the embodiment defines the current from the bridge arm midpoint AC1 to the bridge arm midpoint AC2 on the transmitting coil as a forward current, and the current from the bridge arm midpoint AC2 to the bridge arm midpoint AC1 as a negative current.

[0091] On the basis of the above embodiment, the embodiment of the application further provides another signal transmission control method. Please refer to Figure 8 , which is a flowchart of the another signal transmission control method provided by the embodiment of the application, as Figure 8 shown, the above S10 of generating and outputting two control signals by the control unit according to two driving signals can include:

[0092] S12: generating and outputting two control signals by the control unit when the level value of the first driving signal is effective and the second driving signal is high, wherein the duty cycle of the first control signal is less than the duty cycle of the second control signal.

[0093] In this embodiment, please refer to Figure 9 , the second control signal waveform diagram provided by the embodiment of the application is shown as Figure 9 , when the first driving signal drv0 is high and the second driving signal drv1 is high, the pulse modulation controller 111 generates the first control signal PWM1 and the second control signal PWM2 according to the first driving signal drv0 and the second driving signal drv1, the duty cycle of the first control signal PWM1 is less than the duty cycle of the second control signal PWM2, and the current from the bridge arm midpoint AC2 to the bridge arm midpoint AC1 is formed on the transmitting coil.

[0094] When the coil current exceeds the current threshold value, the current detection unit generates an overcurrent signal IOC1, and the pulse modulation controller 111 switches the duty cycle of the two control signals according to the overcurrent signal IOC1, so that the duty cycle of the first control signal PWM1 is greater than the duty cycle of the second control signal PWM2, and the voltage from the bridge arm midpoint AC1 to the bridge arm midpoint AC2 is formed on the transmitting coil, so as to reduce the current from the bridge arm midpoint AC2 to the bridge arm midpoint AC1 on the transmitting coil.

[0095] It should be noted that, as shown in Figure 7 and Figure 9 , when the duty cycle of PWM1 or PWM2 is not 100%, the power switch tube FET_H1 or the power switch tube FET_H2 will not be continuously turned on for a long time, so the time that the capacitors C1 and C2 need to support will not be always continuous, and the application range of the control unit and the capacitors C1 and C2 can be expanded.

[0096] In a possible implementation, the above S11 includes:

[0097] generating and outputting two control signals by the control unit according to different working cycles in a plurality of time periods when the level value of the first driving signal is effective and the second driving signal is low.

[0098] The above S12 includes:

[0099] The control unit generates and outputs two control signals according to different duty cycles in a plurality of time periods in which the level value of the first driving signal is valid and the second driving signal is at a high level.

[0100] In the embodiment, when the first driving signal drv0 maintains a high level, and the second driving signal drv1 jumps from a low level to a high level or jumps from a high level to a low level, the period of the two control signals changes once every time the jump occurs, and the duty cycle of the two control signals also changes once. By generating control signals with different periods in different time periods, the frequency of the control signals in different time periods can be adjusted to improve electromagnetic interference (EMI) in the transmission process.

[0101] For example, refer to Figure 10 A third control signal waveform diagram provided by the embodiment of the application is shown in Figure 10 When the level value of the first driving signal is valid and the second driving signal is at a low level, the period of the two control signals is T_p1. When the second driving signal jumps to a high level, the period of the two control signals changes to T_n1. When the second driving signal jumps to a low level again, the period of the two control signals changes to T_p2. In this way, the frequency of the control signals in different time periods is adjusted to improve electromagnetic interference in the transmission process.

[0102] It should be noted that the period of the two control signals changes once every time the second driving signal jumps, and is not limited to the three periods T_p1, T_n1, and T_p2 in the example, but is recursively T_p1, T_n1, T_p2, T_n2, and so on. It should be noted that T_p1, T_n1, T_p2, T_n2, and so on are not equal to each other. In this embodiment, T_p1, T_n1, T_p2, T_n2, and so on can be randomly generated in a pseudo-random modulation manner.

[0103] On the basis of the above embodiment, the embodiment of the application further provides another signal transmission control method, which is a second control mode. Refer to Figure 11 A flowchart of another signal transmission control method provided by the embodiment of the application is shown in Figure 11 The method comprises the following steps.

[0104] S40: The control unit generates and outputs two control signals according to the two driving signals, and controls the full-bridge power unit to generate a coil current in the transmitting coil according to the two control signals. When the level value of the first driving signal is valid and the second driving signal jumps once, the initial level of the two control signals switches once.

[0105] S50: output an overcurrent signal to the control unit when the coil current is greater than the first current threshold value is detected by the current detection unit.

[0106] In the embodiment, the first current threshold value is set, and the current detection unit 14 detects the current of the first current sampling point or the second current sampling point to output an overcurrent signal to the control unit when the coil current greater than the first current threshold value is detected.

[0107] S60: the control unit controls the control signal at high level to jump to low level according to the overcurrent signal, the level of the control signal at low level is maintained unchanged, and the full-bridge power unit is controlled to reduce the coil current according to the new two-way control signal to adjust the signal to be transmitted.

[0108] In the embodiment, the control unit controls the control signal at high level to jump to low level according to the overcurrent signal, and the level of the control signal at low level is maintained unchanged, so that the lower tube of the two bridge arms of the full-bridge power unit is turned on to reduce the coil current.

[0109] S70: the control unit outputs an undercurrent signal to the control unit when the coil current is detected to be less than the second current threshold value by the current detection unit.

[0110] In the embodiment, the second current threshold value is set, and the current detection unit 14 detects the current of the first current sampling point or the second current sampling point to output an undercurrent signal to the control unit when the coil current is less than the second current threshold value is detected.

[0111] S80: the control unit controls the control signal at low level to jump to high level again according to the undercurrent signal, the control signal at low level is maintained at low level, and the full-bridge power unit is controlled to increase the coil current according to the new two-way control signal to adjust the signal to be transmitted again.

[0112] In the embodiment, the control unit controls the control signal at low level to jump to high level again according to the undercurrent signal, and the control signal at low level is maintained at low level, so that the full-bridge power unit switches back to the previous conduction state to increase the coil current.

[0113] The wireless signal transmission method provided by the above embodiment reduces the coil current when the coil current is greater than the first current threshold value according to the control signal, and increases the coil current when the coil current is less than the second current threshold value according to the control signal, so that the coil current fluctuates between the first current threshold value and the second current threshold value, avoiding overcurrent or undercurrent, and ensuring stable signal transmission; and the control signal is adjusted in time according to the size of the coil current, so that the control signal immediately adjusts the coil current when the coil current overflows or underflows, realizing faster current control and ensuring the stability of signal transmission.

[0114] In an optional embodiment, when the level value of the first driving signal is valid and the second driving signal is at a low level, the first control signal of the two control signals is at a high level and the second control signal is at a low level, and the above S60 includes:

[0115] The control unit controls the first control signal to jump to a low level according to the overcurrent signal, and the second control signal to maintain a low level.

[0116] The above-mentioned S80 includes:

[0117] The control unit controls the first control signal to jump to a high level again according to the undercurrent signal, and the second control signal continues to maintain a low level.

[0118] In this embodiment, please refer to Figure 12 , is a waveform diagram of the fourth control signal provided in an embodiment of the present application, such as Figure 12 As shown, when the first drive signal drv0 is at a high level and the second drive signal drv0 is at a low level, the first control signal PWM1 in the initial state is at a high level and the second control signal PWM2 is at a low level. The drive controller 112 generates two complementary switching signals PWM_H1 and PWM_L1 according to the high-level first control signal PWM1, wherein the switching signal PWM_H1 is at a high level and the switching signal PWM_L1 is at a low level; the drive controller 112 also generates two complementary switching signals PWM_H2 and PWM_L2 according to the low-level second control signal PWM2, wherein the switching signal PWM_H2 is at a low level and the switching signal PWM_L2 is at a high level.

[0119] Afterwards, the power switch tube FET_H1 is controlled to be turned on according to the switching signal PWM_H1, the power switch tube FET_L1 is controlled to be non-conductive according to the switching signal PWM_L1, the power switch tube FET_H2 is controlled to be non-conductive according to the switching signal PWM_H2, and the power switch tube FET_L2 is controlled to be conductive according to the switching signal PWM_L2. The voltage at the bridge arm midpoint AC1 is greater than the voltage at the bridge arm midpoint AC2, and a forward current is formed on the transmitting coil from the bridge arm midpoint AC1 to the bridge arm midpoint AC2.

[0120] When the forward current is greater than the first current threshold (ITH_peak), the IOC2 is triggered to be high level, the control unit makes the first control signal PWM1 switch to low level according to the IOC2, the second control signal PWM2 maintains low level, the switch signal PWM_H1 switches to low level, the switch signal PWM_L1 switches to high level, the power switch FET_H1 and the power switch FET_H2 are not conductive, the power switch FET_L1 and the power switch FET_L2 are conductive, the voltages of the bridge arm midpoints AC1 and AC2 are pulled down to the ground, so as to reduce the coil current generated by the transmitting coil, until the forward current of the transmitting coil is less than the second current threshold (ITH_valley).

[0121] In the process that the forward current of the transmitting coil decreases from the first current threshold to the second current threshold, the IOC2 continuously is high level, when the forward current is less than the second current threshold, the IOC2 switches to low level, the control unit makes the first control signal PWM1 re-switch to high level according to the IOC2, the second control signal PWM2 maintains low level, the switch signal PWM_H1 re-switches to high level, the switch signal PWM_L1 re-switches to low level, the power switch FET_H1 and the power switch FET_L2 are conductive, the power switch FET_H2 and the power switch FET_L1 are not conductive, the voltage of the bridge arm midpoint AC1 is greater than the voltage of the bridge arm midpoint AC2, so as to increase the coil current generated by the transmitting coil, until the forward current of the transmitting coil is greater than the first current threshold.

[0122] In another optional embodiment, when the level value of the first driving signal is effective, the second driving signal is high level, the first control signal in the two control signals is low level, and the second control signal is high level, the above S60 comprises:

[0123] The second control signal is controlled to jump to low level by the control unit according to the overcurrent signal, and the first control signal maintains low level.

[0124] The above S80 comprises:

[0125] The second control signal is controlled to jump to low level by the control unit according to the overcurrent signal, and the first control signal maintains low level.

[0126] In the embodiment, please refer to Figure 13 , the fifth control signal waveform schematic diagram provided in the embodiment of the application, as Figure 13As shown, in the case that the first driving signal drv0 is high level and the second driving signal drv0 is high level, the first control signal PWM1 in the initial state is low level and the second control signal PWM2 is high level, the driving controller 112 generates two complementary switching signals PWM_H1 and PWM_L1 according to the low level first control signal PWM1, wherein the switching signal PWM_H1 is low level and the switching signal PWM_L1 is high level; the driving controller 112 also generates two complementary switching signals PWM_H2 and PWM_L2 according to the high level second control signal PWM2, wherein the switching signal PWM_H2 is high level and the switching signal PWM_L2 is low level.

[0127] Then, the power switch FET_H1 is controlled to be non-conductive according to the switching signal PWM_H1, the power switch FET_L1 is controlled to be conductive according to the switching signal PWM_L1, the power switch FET_H2 is controlled to be conductive according to the switching signal PWM_H2, and the power switch FET_L2 is controlled to be non-conductive according to the switching signal PWM_L2, the voltage of the bridge arm midpoint AC2 is greater than the voltage of the bridge arm midpoint AC1, and a negative current from the bridge arm midpoint AC2 to the bridge arm midpoint AC1 is formed on the transmitting coil.

[0128] When the absolute value of the negative current is greater than the first current threshold, the IOC1 is triggered to be high level, the control unit switches the second control signal PWM2 to low level according to the IOC1, the first control signal PWM1 maintains low level, the switching signal PWM_H2 is switched to low level, the switching signal PWM_L2 is switched to high level, the power switch FET_H1 and the power switch FET_H2 are non-conductive, the power switch FET_L1 and the power switch FET_L2 are conductive, the voltages of the bridge arm midpoint AC1 and the bridge arm midpoint AC2 are pulled down to ground, so as to reduce the coil current generated by the transmitting coil, until the absolute value of the negative current of the transmitting coil is less than the second current threshold.

[0129] In the process that the absolute value of the negative current of the transmitting coil decreases from the first current threshold to the second current threshold, the IOC1 continuously maintains high level, when the absolute value of the negative current is less than the second current threshold, the IOC1 is switched to low level, the control unit re-switches the second control signal PWM2 to high level according to the IOC1, the first control signal PWM1 maintains low level, the switching signal PWM_H2 is re-switched to high level, the switching signal PWM_L2 is re-switched to low level, the power switch FET_H2 and the power switch FET_L1 are conductive, the power switch FET_H1 and the power switch FET_L2 are non-conductive, the voltage of the bridge arm midpoint AC2 is greater than the voltage of the bridge arm midpoint AC1, so as to increase the coil current generated by the transmitting coil, until the absolute value of the negative current of the transmitting coil is greater than the first current threshold.

[0130] For example, refer to Figure 14 The sixth control signal waveform diagram provided by the embodiment of the application is shown in Figure 14 When the second driving signal drv1 jumps, the level of the two control signals will switch, and in the time period when the second driving signal drv1 is low, the waveform diagram is consistent with Figure 12 , Figure 12 corresponding to Figure 14 the enlarged waveform diagram of the time period when the second driving signal drv1 is low, and in the time period when the second driving signal drv1 is high, the waveform diagram is consistent with Figure 13 , Figure 13 corresponding to Figure 14 the enlarged waveform diagram of the time period when the second driving signal drv1 is high, and the waveform diagram in Figure 14 will not be described here.

[0131] On the basis of the above embodiment, the application further discloses a signal transmission system, which comprises a receiving module and a transmitting module, wherein the circuit structure of the transmitting module is as shown in Figure 1 or Figure 2 The process of the transmitting module to realize the signal transmission control method is as described above, and will not be described here.

[0132] The transmitting module is arranged in a signal sending device, and the receiving module is arranged in a signal receiving device and comprises at least one receiving coil, which receives the electromagnetic signal transmitted by the transmitting coil to realize the signal transmission between the transmitting coil and the receiving coil.

[0133] The above is only a specific embodiment of the application, but the protection scope of the application is not limited to this, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the application, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A signal transmission control method, characterized in that: A transmitting module used in a signal transmission system, the transmitting module comprising: a control unit, a full-bridge power unit, a transmitting coil, and a current detection unit, wherein the transmitting coil is connected between the midpoints of the two bridge arms of the full-bridge power unit, and a current sampling point of the transmitting coil is connected to the control unit via the current detection unit; the method comprising: The control unit generates and outputs two control signals based on the two drive signals, and controls the full-bridge power unit based on the two control signals so that the transmitting coil generates a coil current. The frequencies of the two control signals are higher than those of the two drive signals, and the duty cycles of the two control signals are different. When the level of the first drive signal is valid, each time the second drive signal changes, the duty cycles of the two control signals change synchronously, and the multiple changes in duty cycles are different. When the current detection unit detects that there is an overcurrent in the transmitting coil, an overcurrent signal is output to the control unit; The control unit switches the duty cycle of the two control signals according to the overcurrent signal, and reduces the coil current according to the switched two control signals to adjust the signal to be transmitted.

2. The method according to claim 1, wherein The control unit generates and outputs two control signals according to the two drive signals, including: The control unit generates and outputs the two control signals when the level value of the first drive signal is valid and the second drive signal is at a low level, wherein the duty cycle of the first control signal is greater than the duty cycle of the second control signal.

3. The method according to claim 2, wherein The control unit generates and outputs the two control signals when the level value of the first drive signal is valid and the second drive signal is at a low level, including: The control unit generates and outputs the two control signals according to different working cycles within multiple time periods when the level value of the first driving signal is valid and the second driving signal is at a low level.

4. The method according to claim 1, wherein The control unit generates and outputs two control signals according to the two drive signals, including: The control unit generates and outputs the two control signals when the level value of the first drive signal is valid and the second drive signal is at a high level, wherein the duty cycle of the first control signal is smaller than the duty cycle of the second control signal.

5. The method according to claim 4, wherein The control unit generates and outputs the two control signals when the level value of the first drive signal is valid and the second drive signal is at a high level, including: The control unit generates and outputs the two control signals according to different working cycles in multiple time periods when the level value of the first driving signal is valid and the second driving signal is at a high level.

6. A transmitting module, characterized in that: The transmitting module includes: a control unit, a full-bridge power unit, a transmitting coil, and a current detection unit, wherein the transmitting coil is connected between the midpoints of the two bridge arms of the full-bridge power unit, and the current sampling point of the transmitting coil is connected to the control unit through the current detection unit; the transmitting module is used to execute the signal transmission control method according to any one of claims 1 to 5.

7. A signal transmission system, characterized in that: The signal transmission system includes: a receiving module and the transmitting module as claimed in claim 6.

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