WO2022222003A1

WO2022222003A1 - Connecting apparatus, movable platform, control method, and storage medium

Info

Publication number: WO2022222003A1
Application number: PCT/CN2021/088198
Authority: WO
Inventors: 王浩正; 靖俊; 孙仲健
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2021-04-19
Filing date: 2021-04-19
Publication date: 2022-10-27

Abstract

A connecting apparatus, a movable platform, a control method, and a storage medium. The connecting apparatus (1) comprises a driving module (10), and further comprises: a resistor sequence (20) comprising a plurality of first resistors (21), wherein a plurality of feedback resistors having different resistance values can be obtained by adjusting the first resistors (21) of the resistor sequence (20), and the feedback resistors having different resistance values can respectively define a plurality of different maximum currents of the driving module (10); a switch sequence (30) comprising a plurality of switches (31), wherein the switches (31) can be turned on or off to adjust the first resistors (21) of the resistor sequence (20) to obtain corresponding feedback resistors; and a first control module (40) capable of controlling, according to received device signals, the switches (31) to be turned on or off, so that the maximum currents defined by the feedback resistors obtained by the adjustment correspond to the device signals.

Description

Connection device, movable platform, control method and storage medium

technical field

The present application relates to the technical field of electronic products, and in particular, to a connection device, a movable platform, a control method and a storage medium.

Background technique

In a typical application of an electronic product with a screen, the driving current of the screen backlight is determined by the maximum current of the backlight driving module and the pulse width modulation (PWM, Pulse width modulation) signal generated by the controller. The maximum current of the backlight driver module is generally consistent with the screen model. The maximum current of the backlight driving module is limited by the feedback resistance, and its value is the reference voltage generated inside the backlight driving module divided by the feedback resistance.

When an electronic product with a screen introduces multiple models of screens, it needs to be adapted according to the model of the screen. There are two main solutions: the first solution is to develop multiple different hardware versions to adapt to different screens; The second solution is to develop only one piece of hardware. By identifying the model of the screen, the controller uses software to limit the maximum duty cycle of the PWM to achieve screen adaptation.

However, the first solution increases the cost of hardware R&D and material management, and also increases the cost and difficulty of production mixing and after-sales maintenance; the second solution cannot effectively limit the PWM duty cycle if the software logic is wrong or the program is stuck. , there will be a safety risk of overcurrent of the output current of the backlight driver module.

SUMMARY OF THE INVENTION

Based on this, the present application provides a connection device, a movable platform, a control method and a storage medium.

In a first aspect, the present application provides a connection device, including a drive module, and the connection device further includes:

The resistor sequence includes a plurality of first resistors. By adjusting the first resistors of the resistor sequence, a plurality of feedback resistors with different resistance values can be obtained, and the plurality of feedback resistors with different resistance values can respectively define a plurality of different the maximum current;

a switch array, including a plurality of switches, the switches can be turned on or off to adjust the first resistance of the resistance array to obtain a corresponding feedback resistance;

A first control module, the control module can control the switch to open or close according to the received device signal, so that the maximum current limited by the adjusted feedback resistor corresponds to the device signal.

In a second aspect, the present application provides a method for controlling a connection device, the method comprising:

receive equipment signals;

The switch of the switch array is controlled to be turned on or off according to the device signal, so as to adjust the first resistance of the resistance sequence so that the maximum current of the driving module defined by the adjusted feedback resistance corresponds to the device signal, wherein the connection device includes the The drive module, the resistor sequence and the switch array, the resistor sequence includes a plurality of the first resistors, and a plurality of the feedback resistors with different resistance values can be obtained by adjusting the first resistors of the resistor sequence. The feedback resistors with different resistance values can respectively define a plurality of different maximum currents of the driving module, the switch array includes a plurality of switches, and the switches can be turned on or off to adjust the first resistance of the resistor array Get the corresponding feedback resistor.

In a third aspect, the present application provides a movable platform, the movable platform has a plurality of different screens, and the movable platform includes the connection device as described above.

In a fourth aspect, the present application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor realizes the control of the connection device as described above. method.

Embodiments of the present application provide a connection device, a movable platform, a control method, and a storage medium. The connection device includes a drive module, a resistor sequence, a switch array, and a first control module. The resistor sequence includes a plurality of first resistors. By adjusting The first resistor of the resistor sequence can obtain a plurality of feedback resistors with different resistance values, and the plurality of feedback resistors with different resistance values can respectively limit a plurality of different maximum currents of the driving module; the switch array includes a plurality of switches, so the The switch can be turned on or off to adjust the first resistance of the resistance array to obtain the corresponding feedback resistance; the first control module can control the switch to turn on or off according to the received device signal, so that the adjusted feedback resistance can limit the maximum value. The current corresponds to the device signal. Since the resistor sequence includes a plurality of first resistors, and the switch array includes a plurality of switches, the first control module can control the switches to be turned on or off according to the received device signal, so that the maximum current limited by the adjusted feedback resistor corresponds to the device signal, and the device signal Different, the feedback resistance obtained by adjusting the first resistance of the resistance sequence is different, and different feedback resistances can respectively limit different maximum currents of the drive module, so that only one connection device is needed to meet the requirements of multiple devices (such as screens). Therefore, it is possible to reduce the cost of hardware research and development and material management, facilitate the generation and after-sales material management, and reduce the after-sales maintenance cost; because multiple feedback resistors with different resistance values are obtained by adjusting the first resistance of the resistance sequence, which respectively limit the driving module Multiple different maximum currents are not implemented by software logic, which can avoid the safety risk of output current overcurrent that may be caused by software logic implementation.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not limiting of the present application.

Description of drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. For those of ordinary skill, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic structural diagram of an embodiment of a connecting device of the present application;

2 is a schematic structural diagram of another embodiment of the connecting device of the present application;

3 is a schematic structural diagram of another embodiment of the connecting device of the present application;

4 is a schematic structural diagram of another embodiment of the connecting device of the present application;

5 is a schematic structural diagram of another embodiment of the connecting device of the present application;

6 is a schematic structural diagram of another embodiment of the connecting device of the present application;

FIG. 7 is a schematic flowchart of an embodiment of a control method for a connection device of the present application.

Description of main components and symbols:

1. Connecting device;

10. Drive module; 11. Positive output terminal; 12. Negative output terminal; 20. Resistor sequence; 21. First resistor; 30. Switch sequence; 31. Switch; 40. First control module; 41. Voltage threshold providing circuit ; 42, a comparison circuit; 421, a comparison unit; 50, a second control module;

R _F0 , zero resistor; R _F1 -R _Fn , non-zero resistor; SW1-SWn, n-MOS; R1-R3, second resistor; U _CMP1 -U _CMP2 , comparator.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

The flowcharts shown in the figures are for illustration only, and do not necessarily include all contents and operations/steps, nor do they have to be performed in the order described. For example, some operations/steps can also be decomposed, combined or partially combined, so the actual execution order may be changed according to the actual situation.

When an electronic product with a screen introduces multiple models of screens, it needs to be adapted according to the model of the screen. There are two main solutions: the first solution is to develop multiple hardware versions to adapt to different screens; the second solution The solution is to develop a piece of hardware, identify the model of the screen, and realize screen adaptation by limiting the maximum duty cycle of PWM through software. However, the first solution increases the cost and difficulty of research and development, material management, production mixing and after-sales maintenance; the second solution has the safety risk of overcurrent of the output current of the backlight drive module.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and features in the embodiments may be combined with each other without conflict.

Referring to FIG. 1 , FIG. 1 is a schematic structural diagram of an embodiment of a connection device of the present application. The connection device 1 includes a driving module 10 , a resistor sequence 20 , a switch array 30 and a first control module 40 .

The driving module 10 in the embodiment of the present application may refer to a circuit composed of a driving integrated circuit (IC, Integrated Circuit) and a small number of peripheral components, or may be any power supply circuit with an external feedback resistance, such as a boost switching power supply, Low dropout linear regulator (LDO) with low voltage switching power supply or external feedback resistor.

The resistor sequence 20 includes a plurality of first resistors 21 . By adjusting the first resistors 21 of the resistor sequence 20 , a plurality of feedback resistors with different resistance values can be obtained, and the plurality of feedback resistors with different resistance values can respectively define the driving module 10 a plurality of different maximum currents; the switch array 30 includes a plurality of switches 31, the switches 31 can be turned on or off to adjust the first resistance 21 of the resistance array 20 to obtain a corresponding feedback resistance; the first control module 40 can The received device signal controls the switch 31 to be turned on or off, so that the maximum current limited by the adjusted feedback resistor corresponds to the device signal.

In this embodiment, the maximum current of the driving module 10 is determined by the total resistance (ie, the feedback resistance) actually output by the resistance sequence 20 . The resistor sequence 20 includes a plurality of first resistors 21 . By adjusting the first resistors 21 of the resistor sequence 20 , a plurality of feedback resistors with different resistance values can be obtained, so that the plurality of feedback resistors with different resistance values can respectively define the driving module. Multiple different maximum currents of 10, that is, the drive module 10 can output multiple different maximum currents according to multiple different feedback resistors, which enables the drive module to drive different types of equipment, and different types of equipment can share a connection device, This can reduce the cost of research and development, materials, management, and after-sales.

The switch array 30 includes a plurality of switches 31 , and the adjustment of the first resistance 21 of the resistance sequence is realized by opening and closing the switches 31 of the switch array 30 .

The maximum current limited by the feedback resistance obtained by adjustment corresponds to the device signal. In the specific implementation, the correspondence between a plurality of different preset maximum currents and a plurality of different preset device signals can be preset according to the received device signals. The maximum current corresponding to the device signal can be obtained by the signal and the corresponding relationship; or the corresponding relationship between multiple different preset device signals and multiple preset device currents can be preset, and multiple different preset device currents are associated with multiple preset device currents. Set the corresponding relationship between the maximum currents, according to the received device signal and the two correspondences, the maximum current corresponding to the current corresponding to the device signal can be obtained (in practical applications, the current corresponding to the device signal is usually consistent with the corresponding maximum current, That is, what is the current corresponding to the device signal, and what is the maximum current).

The device signal may refer to a signal sent by a device that needs to be driven by the driving module 10 and capable of identifying the model of the device, or a signal sent by the device that matches or corresponds to the device. After the connection device 1 is connected to the device, the device sends a device signal, and the first control module 40 can receive the device signal, and control the switch 31 of the switch array 30 to open or close according to the received device signal, so that the resistance can be adjusted The first resistor 21 of the sequence 20 makes the adjusted maximum current limited by the feedback resistor to correspond to the device signal. In this way, the maximum current of the driving module 10 can be matched or corresponded to the device.

An embodiment of the present application provides a connection device, the connection device includes a drive module, a resistance sequence, a switch array, and a first control module, the resistance sequence includes a plurality of first resistances, and can be obtained by adjusting the first resistances of the resistance sequence A plurality of feedback resistors with different resistance values, which can respectively limit a plurality of different maximum currents of the driving module; the switch array includes a plurality of switches, and the switches can be turned on or off to adjust the The first resistance of the resistance array obtains a corresponding feedback resistance; the first control module can control the switch to open or close according to the received device signal, so that the maximum current limited by the adjusted feedback resistance corresponds to the device signal. Since the resistor sequence includes a plurality of first resistors, and the switch array includes a plurality of switches, the first control module can control the switches to be turned on or off according to the received device signal, so that the maximum current limited by the adjusted feedback resistor corresponds to the device signal, and the device signal Different, the feedback resistance obtained by adjusting the first resistance of the resistance sequence is different, and different feedback resistances can respectively limit different maximum currents of the drive module, so that only one connection device is needed to meet the requirements of multiple devices (such as screens). Therefore, it is possible to reduce the cost of hardware research and development and material management, facilitate the generation and after-sales material management, and reduce the after-sales maintenance cost; because multiple feedback resistors with different resistance values are obtained by adjusting the first resistance of the resistance sequence, which respectively limit the driving module Multiple different maximum currents are not implemented by software logic, which can avoid the safety risk of output current overcurrent that may be caused by software logic implementation.

Generally, if the number of feedback resistors is greater than the number of first resistors, that is, if the number of first resistors is small, the number of feedback resistors needs to be adjusted to be larger than the number of first resistors, then the circuit control is complicated. In order to simplify circuit control and reasonably control hardware costs, the number of feedback resistors can be equal to the number of first resistors, that is, the number of feedback resistors is m, and the number of first resistors is m , m is greater than 1. The m feedback resistors can respectively limit m different maximum currents of the driving module, and the m different maximum currents can respectively correspond to m different device signals, that is, m different types of devices can be adapted.

In order to realize the adjustment of m feedback resistors through m first resistors, there may be various implementation manners. There are two more common ways: one way is to reuse the first resistor (that is, the resistance value of a first resistor is not completely corresponding to the resistance value of a feedback resistor. The first resistor obtains a feedback resistor), another way is to not reuse the first resistor, the resistance of one first resistor corresponds to the resistance of one feedback resistor, and the resistances of m first resistors are respectively m feedback resistors resistance value. Relatively speaking, the circuit control in the method of multiplexing the first resistor is easier to implement and simpler, and the details of the multiplexing of the first resistor are described in detail below.

Referring to FIG. 2 , in one embodiment, the m first resistors 21 include a zero-numbered resistor (denoted as R _F0 ) and n non-zero-numbered resistors (denoted as R _F1 , R _F2 , ..., R _Fn ), the resistance of the zero-numbered resistor is the resistance value of the first feedback resistor, and the zero-numbered resistor and p-1 non-zero-numbered resistors are connected in parallel to obtain the pth feedback resistor , the resistance of the p-th feedback resistor is greater than the resistance of the p+1-th feedback resistor and less than the resistance of the p-1-th feedback resistor, p is greater than or equal to 2, and n is greater than or equal to 1.

In this embodiment, the m first resistors 21 include a zero-numbered resistor R _F0 and n non-zero- _numbered resistors R _F1 , R _F2 , . 1.

The resistance value of the zero-numbered resistor R _F0 is the resistance value of the first feedback resistor R _f1 , and the resistance value of the first feedback resistor R _f1 is the largest among the m feedback resistors. The zero-numbered resistor R _F0 is connected in parallel with a first resistor to obtain a second feedback resistor R _f2 , and the resistance value of the second feedback resistor R _f2 is smaller than the resistance value of the first feedback resistor R _f1 . The zero-numbered resistor R _F0 is connected in parallel with the two first resistors to obtain a third feedback resistor R _f3 , and the resistance value of the third feedback resistor R _f3 is smaller than the resistance value of the second feedback resistor R _f2 . A fourth feedback resistor R _f4 can be obtained by connecting the zero-numbered resistor R _F0 with the three first resistors in parallel. The resistance value of the fourth feedback resistor R _f4 is smaller than the resistance value of the third feedback resistor R _f3 . … The zero-numbered resistor R _F0 is connected in parallel with the n first resistors to obtain the n+1th (ie m) feedback resistor R _fm , and the resistance of the n+1th feedback resistor R _fm is smaller than the nth feedback resistor R _fn . The resistance value of the n+1th feedback resistor R _fm is the smallest. That is, R _f1 >R _f2 >R _f3 >R _f4 >... >R _fn >R _fn+1 .

Further referring to FIG. 2 , one end of each switch 31 is connected to each non-zero resistor, and the other end is connected to the first control module 40 . That is, the zero-numbered resistor is always connected to the circuit, and the first control module 40 can control each switch connected to each non-zero-numbered resistor to be turned on or off.

The switch 31 includes a commonly used N-type Metal Oxide Semiconductor (NMOS, n-type Metal Oxide Semiconductor), as shown in FIG. 3 , where the N-type metal oxide semiconductor is denoted as SW. The switch can also be any other type of device with switching function, such as an analog switch chip, a relay, a triode, an insulated gate bipolar transistor (IGBT, Insulated Gate Bipolar Transistor), and the like.

Referring to FIG. 3 , in an embodiment, the device signal includes a device voltage signal, and the first control module 40 includes: a voltage threshold providing circuit 41 and a comparison circuit 42 .

The voltage threshold providing circuit 41 is used for providing n different voltage thresholds, the qth voltage threshold is greater than the voltage value of the qth device voltage signal, and is smaller than the voltage value of the q+1th device voltage signal, and q is greater than or equal to 1 , and less than or equal to n.

The voltage threshold providing circuit 41 in this embodiment can be any device or circuit with the function of outputting an analog voltage, such as a voltage dividing resistor, a voltage reference source, a switching voltage source, a digital-to-analog converter (DAC, Digital to Analog Converter), a micro-controller Unit (MCU, Microcontroller Unit), System on Chip (SOC, System on Chip), Field Programmable Gate Array (FPGA, Field-Programmable Gate Array), etc.

The comparison circuit 42 is used to compare the voltage value of the received device voltage signal with the voltage threshold value. If the received voltage value is less than the first voltage threshold value, it controls the first switch to the nth switch to close, so that the adjusted The feedback resistor is the first feedback resistor; if the received voltage value is less than the qth voltage threshold and greater than the q-1th voltage threshold, and q is greater than 1 and less than or equal to n, control the first switch to The q-1th switch is turned on, and the qth switch to the nth switch are turned off, so that the adjusted feedback resistance is the qth feedback resistance; if the received voltage value is greater than the nth voltage threshold, the first switch is controlled The switch to the nth switch is turned on, so that the adjusted feedback resistance is the n+1th feedback resistance.

In this embodiment, the n+1 different device voltage signals V _ID that may be received are sorted according to the size of the voltage value, and the corresponding _n different voltage thresholds VP are also sorted according to the size, which satisfies the following relationship:

(1) V _ID1 < V _ID2 < V _ID3 <... V _IDn < V _IDn+1 ;

(2) V _p1 < V _p2 < V _p3 <... V _pn-1 < V _pn ;

(3) V _ID1 < V _p1 < V _ID2 < V _p2 < V _ID3 < V _p3 <... < V _pn-1 < V _IDn < V _pn < V _IDm .

Among them, according to formula (3), the magnitude of each voltage threshold is between the voltage values of the two adjacent device voltage signals, and the device voltage signals may be located in three different positions in formula (3): the head ( ie V _ID < V _p1 , q=1), middle (ie V _pq-1 < V _ID < V _pq , 1 < q≤n) and tail (ie V _ID >V _pn , q=n).

When the received voltage value is at the head, that is, the received voltage value is less than the first voltage threshold, that is, V _ID <V _p1 , the adjusted feedback resistance is the first feedback resistance, and the first feedback resistance The resistance value is the resistance value of the zero-numbered resistor, excluding non-zero-numbered resistors, so control the first switch to the nth switch to close, so that the adjusted feedback resistance is the first feedback resistance.

When the received voltage value is in the middle, that is, the received voltage value is less than the qth voltage threshold and greater than the q-1th voltage threshold, and q is greater than 1 and less than or equal to n, that is, V _pq-1 <V _ID <V _pq , 1<q≤n, the adjusted feedback resistor is the qth feedback resistor, and the resistance of the qth feedback resistor is the resistance value of the zero resistor and the q-1 non-zero resistor in parallel , so control the 1st switch to the q-1th switch to open, and the qth switch to the nth switch to close, so that the adjusted feedback resistance is the qth feedback resistance.

When the received voltage value is at the tail, that is, the received voltage value is greater than the nth voltage threshold, that is, V _ID >V _pn , q=n, then the adjusted feedback resistance is the n+1th feedback resistance, and the th The resistance value of n+1 feedback resistors in parallel with zero resistors and n non-zero resistors, so control the 1st switch to the nth switch to open, so that the adjusted feedback resistor is the n+1th feedback resistor .

Referring to FIG. 4 , in an embodiment, the comparison circuit 42 includes: n comparison units 421 . The output end of each comparison unit 421 is connected to a switch, and the input end of each comparison unit 421 is used to receive the device voltage signal and a voltage threshold provided by the threshold voltage circuit 41 , if the device voltage received by the comparison unit 421 If the voltage value of the signal is greater than the voltage threshold, the switch 31 connected to the output end of the comparison unit 421 is turned on, and if the voltage value received by the comparison unit 421 is less than the voltage threshold, the comparison unit 421 is turned on The output of the connected switch 31 is closed.

In this embodiment, n non-zero resistors are respectively connected to n switches, so n comparison units are provided, and the output end of each comparison unit is connected to a switch, and each comparison unit receives a device voltage signal and also receives a threshold voltage A voltage threshold provided by the circuit 41 (that is, the n different voltage thresholds of the threshold voltage circuit 41 are respectively provided to n comparison units, and one comparison unit provides a voltage threshold), and each comparison unit compares the voltage of the received device voltage signal value and a voltage threshold provided by the threshold voltage circuit 41, if the voltage value of the device voltage signal received by the comparison unit 421 is greater than the voltage threshold, the switch 31 connected to the output end of the comparison unit 421 is turned on, if the If the voltage value received by the comparison unit 421 is smaller than the voltage threshold, the switch 31 connected to the output end is turned off.

The comparison unit 421 includes a commonly used comparator, and can also be any device or circuit with an analog voltage input function, such as an operational amplifier, a microcontroller unit MCU, a system-on-chip SOC, a field programmable gate array FPGA, an analog/ Digital Converter (ADC, Analog-to-Digital Converter), etc.

In one embodiment, the voltage threshold providing circuit 41 includes m second resistors (marked as R1, R2, R3, . . . , Rm). The m second resistors are connected in series to form two ends, one end is grounded, and the other end is connected to the working voltage VDD, and the m second resistors form n different voltage thresholds.

Referring to FIG. 5 , in an embodiment, the driving module 10 includes a positive output terminal 11 and a negative output terminal 12 , one end of each of the first resistors 21 is connected to the negative output terminal 12 of the driving module 10 , and the other One end is grounded.

In one embodiment, the driving module 10 is a screen driving module, the device signal is a screen voltage signal for identifying a screen model, and the maximum current limited by the feedback resistor is consistent with the current corresponding to the screen model.

Referring to FIG. 5 , in an embodiment, the apparatus further includes: a second control module 50 . The second control module 50 is configured to determine the duty cycle PWM of the pulse width modulation signal of the driving module 10 according to the received device signal. The second control module 50 may be any device or circuit with a control function, such as MCU, SOC, FPGA, complex programmable logic device (CPLD, Complex Programming Logic Device), and so on.

In the following, the device is used as a screen, and the drive module can be adapted to three different types of screens as an example to describe the connection device of the embodiment of the present application in detail.

First, it is assumed that the three different types of screens are sorted according to the current size. The three types of screen 1, screen 2, and screen 3 require the driving current (ie, the maximum current of the driving module) to be _ILIM1 , _ILIM2 , and _ILIM3 , which satisfy the relationship I _LIM1 < I _LIM2 < I _LIM3 .

The voltage of the screen voltage signal is generated by the voltage divider in the internal circuit of the screen module. It can be customized when the screen is customized and matched. Let the voltage values V _ID of the screen voltage signals of three different screens be V _ID1 , V _ID2 , V _ID3 respectively. . In order to realize the self-adaptive drive function, it is required that the magnitude relationship of V _ID is consistent with the magnitude relationship of the maximum current of the drive module, that is, V _ID1 <V _ID2 <V _ID3 .

As shown in Figure 6, the connection device is an adaptive drive circuit that can adapt to three different types of screens. In addition to the basic adaptation circuit, the circuit also includes resistors composed of first resistors R _F0 , R _F1 and R _F2 Array, a switch array composed of switches SW1 and SW2, the comparison circuit includes two comparators U _CMP1 and U _CMP2 , and the voltage threshold providing circuit is composed of three voltage dividing resistors (ie, second resistors), which can generate two voltage thresholds V _P1 and _VP2 .

Adjust the resistance values of the three second resistors R1, R2, and R3 to satisfy V _ID1 <V _P1 , V _P1 <V _ID2 <V _P2 , and V _P2 <V _ID3 .

Adjust the resistance values of the first resistors R _F0 , R _F1 , and R _F2 of the resistor sequence to satisfy:

I _LIM1 =V _REF /R _F0 ;

I _LIM2 = V _REF /(R _F0 //R _F1 );

I _LIM3 =V _REF /(R _F0 //R _F1 //R _F2 );

In the formula, the "//" symbol indicates that the resistors are connected in parallel. Due to the parallel relationship of the resistors, R _F0 >(R _F0 //R _F1 )>(R _F0 //R _F1 //R _F2 ), so I _LIM1 <I _LIM2 <I _{LIM3 is} established.

When the connection device is connected to the screen 1, at this time, since V _ID1 <V _P1 <V _P2 , both U _CMP1 and U _CMP2 output low level, and the switches SW1 and SW2 are both in the off state (ie off, non-conductive), at this time The actual feedback resistor (ie, the first feedback resistor) is R _F0 , the first resistors R _F1 and R _F2 are open-circuited, and the maximum current of the driving module is I _LIM1 .

When the connecting device is connected to the screen 2, at this time, since V _P1 < V _ID2 < V _P2 , U _CMP1 outputs a high level, U _CMP2 outputs a low level, the switch SW1 is in an open state (ie, turned on), and the switch SW2 is in an off state , at this time the actual feedback resistance (ie the second feedback resistance) is (R _F0 //R _F1 ), the first resistance R _F2 is open, and the maximum current of the drive module is I _LIM2 .

When the connection device is connected to the screen 3, at this time, since V _P2 < V _ID3 , both U _CMP1 and U _CMP2 output a high level, and the switches SW1 and SW2 are both in an open state (that is, conducting), and the actual feedback resistance (that is, the first The three feedback resistors) are (R _F0 //R _F1 //R _F2 ), and the maximum current of the drive module is I _LIM3 .

In this way, the adaptive function of the connection device is realized. The same principle can be extended to adapt to any kind of adaptive screen driving circuit. In this circuit, the software does not need to judge the screen model, nor does it need to limit the maximum PWM duty cycle, and the maximum current driven by the screen backlight can be automatically set by hardware. Since basic components such as resistors, MOS tubes, and comparators are used to form the circuit, it has the characteristics of high reliability, not easy to damage, and low cost.

Referring to FIG. 7, FIG. 7 is a schematic flowchart of an embodiment of a control method for a connection device of the present application. It should be noted that the above-mentioned connection device can execute the control method of this embodiment. For a detailed description of the relevant content, please refer to the above-mentioned connection device section , will not be repeated here.

The method includes: step S101 and step S102.

Step S101: Receive a device signal.

Step S102: Control the switch of the switch array to turn on or off according to the device signal, so as to adjust the first resistance of the resistance sequence so that the maximum current of the driving module defined by the adjusted feedback resistance corresponds to the device signal, wherein the connection device It includes the driving module, the resistor sequence and the switch array, the resistor sequence includes a plurality of the first resistors, and the feedback of multiple different resistance values can be obtained by adjusting the first resistors of the resistor sequence A plurality of the feedback resistors with different resistance values can respectively define a plurality of different maximum currents of the driving module, and the switch array includes a plurality of switches, and the switches can be turned on or off to adjust the resistance of the resistor array. The first resistance obtains the corresponding feedback resistance.

Wherein, the device signal includes a device voltage signal, and controlling the switch of the switch array to turn on or off according to the device signal includes: comparing the voltage value of the device voltage signal with the voltage threshold provided by the voltage threshold providing circuit, if receiving If the received voltage value is less than the first voltage threshold, control the first switch to the nth switch to turn off, so that the adjusted feedback resistance is the first feedback resistance. If the received voltage value is less than the qth voltage threshold, And greater than the q-1th voltage threshold, and q is greater than 1 and less than n or equal to n, then control the first switch to the q-1th switch to open, and the qth switch to the nth switch to close, so that the adjusted The feedback resistor is the qth feedback resistor; if the received voltage value is greater than the nth voltage threshold, control the first switch to the nth switch to open, so that the adjusted feedback resistor is the n+1th feedback resistor ; wherein, the voltage threshold providing circuit is used to provide n different voltage thresholds, and the qth voltage threshold is greater than the voltage value of the qth device voltage signal, and is smaller than the voltage value of the q+1th device voltage signal, q greater than or equal to 1, and less than or equal to n; the number of the feedback resistors and the number of the first resistors are both m, and m is greater than 1, and the m first resistors include a zero resistor and n A non-zero resistor except the zero resistor, the resistance of the zero resistor is the resistance value of the first feedback resistor, and the zero resistor and p-1 non-zero resistors are connected in parallel to obtain the first p feedback resistors, the resistance value of the pth feedback resistor is greater than the resistance value of the p+1th feedback resistor and less than the resistance value of the p-1th feedback resistor, p is greater than or equal to 2, and n is greater than or equal to 1. One end of each switch is connected to each non-zero resistor.

Wherein, the receiving the device signal includes: controlling each of the n comparison units to receive the device voltage signal and a voltage threshold provided by the threshold voltage circuit, and the connection device includes the n comparison units The output end of each comparison unit is connected to a switch; the controlling the switch of the switch array to turn on or off according to the device signal includes: controlling each comparison unit to compare the voltage value of the received device voltage signal with the received voltage value of the device voltage signal. the voltage threshold value; if the voltage value received by the comparison unit is greater than the voltage threshold value, the switch connected to the output end of the comparison unit is turned on, and if the voltage value received by the comparison unit is less than the voltage threshold value, Then the switch connected to the output end of the comparison unit is turned off.

Wherein, the method further includes: determining the duty cycle of the pulse width modulation signal of the driving module according to the device signal.

The present application also provides a movable platform, the movable platform has a plurality of different screens, and the movable platform includes the connection device according to any one of the above. For the detailed description of the related content, please refer to the connection device section, which will not be repeated here. The movable platform includes, but is not limited to, a remote control device.

The present application also provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the processor enables the processor to control the connection device according to any one of the above method. For a detailed description of the relevant content, please refer to the above-mentioned relevant content section, which will not be repeated here.

Wherein, the computer-readable storage medium may be the above-mentioned connecting device or an internal storage unit of the movable platform, such as a hard disk or a memory. The computer-readable storage medium may also be an external storage device, such as an equipped plug-in hard disk, smart memory card, secure digital card, flash memory card, and the like.

It should be understood that the terms used in the specification of the present application are only for the purpose of describing particular embodiments and are not intended to limit the present application.

It will also be understood that, as used in this specification and the appended claims, the term "and/or" refers to and including any and all possible combinations of one or more of the associated listed items.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalents within the technical scope disclosed in the present application. Modifications or substitutions shall be covered by the protection scope of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A connection device, comprising a drive module, characterized in that the connection device further comprises:

The resistor sequence includes a plurality of first resistors. By adjusting the first resistors of the resistor sequence, a plurality of feedback resistors with different resistance values can be obtained, and the plurality of feedback resistors with different resistance values can respectively define a plurality of different the maximum current;

a switch array, including a plurality of switches, the switches can be turned on or off to adjust the first resistance of the resistance array to obtain a corresponding feedback resistance;

A first control module, the control module can control the switch to open or close according to the received device signal, so that the maximum current limited by the adjusted feedback resistor corresponds to the device signal.
The device according to claim 1, wherein the number of the feedback resistors is m, the number of the first resistors is m, and m is greater than 1.
The device according to claim 2, wherein the m first resistors comprise a zero-numbered resistor and n non-zero-numbered resistors except the zero-numbered resistor, and the resistance of the zero-numbered resistor is The resistance of the first feedback resistor, the zero-numbered resistor and the p-1 non-zero-numbered resistors are connected in parallel to obtain the pth feedback resistor, and the resistance of the pth feedback resistor is greater than the p+1th feedback resistor The resistance value of , and is less than the resistance value of the p-1th feedback resistor, p is greater than or equal to 2, and n is greater than or equal to 1.
The device according to claim 3, wherein one end of each switch is connected to each non-zero resistor, and the other end is connected to the first control module.
The device according to claim 4, wherein the device signal comprises a device voltage signal, and the first control module comprises:

A voltage threshold providing circuit is used to provide n different voltage thresholds, the qth voltage threshold is greater than the voltage value of the qth device voltage signal and less than the voltage value of the q+1th device voltage signal, and q is greater than or equal to 1 , and less than or equal to n;

The comparison circuit is used to compare the voltage value of the received device voltage signal with the voltage threshold, and if the received voltage value is less than the first voltage threshold, control the first switch to the nth switch to close, so that the adjusted The feedback resistor is the first feedback resistor. If the received voltage value is less than the qth voltage threshold and greater than the q-1th voltage threshold, and q is greater than 1 and less than or equal to n, the first switch is controlled Turn on the q-1th switch, and turn off the qth switch to the nth switch, so that the adjusted feedback resistance is the qth feedback resistance; if the received voltage value is greater than the nth voltage threshold, control the first Switches to the nth switch are turned on, so that the adjusted feedback resistance is the n+1th feedback resistance.
The apparatus according to claim 5, wherein the comparison circuit comprises:

There are n comparison units, the output end of each comparison unit is connected to a switch, and the input end of each comparison unit is used to receive the device voltage signal and a voltage threshold provided by the threshold voltage circuit, if the device received by the comparison unit If the voltage value of the voltage signal is greater than the voltage threshold, the switch connected to the output end of the comparison unit is turned on, and if the voltage value received by the comparison unit is less than the voltage threshold, the output end of the comparison unit is turned on The connected switch is closed.
6. The apparatus of claim 6, wherein the comparison unit comprises a comparator.
The device according to claim 5, wherein the voltage threshold providing circuit comprises:

m second resistors, the m second resistors are connected in series to form two ends, one end is grounded, and the other end is connected to the working voltage, and the m second resistors form n different voltage thresholds.
5. The apparatus of claim 4, wherein the switch comprises an N-type metal oxide semiconductor.
The device according to claim 2, wherein the resistance values of the m first resistors are respectively the resistance values of the m feedback resistors.
The device according to claim 1, wherein the driving module comprises a positive output terminal and a negative output terminal, one end of each of the first resistors is connected to the negative output terminal of the driving module, and the other end is grounded.
The device according to claim 1, wherein the drive module is a screen drive module, the device signal is a screen voltage signal used to identify a screen model, and the maximum current defined by the feedback resistor is the same as the screen model. The corresponding currents are the same.
The device according to claim 1, wherein the device further comprises:

The second control module is configured to determine the duty cycle of the pulse width modulation signal of the driving module according to the received device signal.
A control method of a connection device, characterized in that the method comprises:

receive equipment signals;

The switch of the switch array is controlled to be turned on or off according to the device signal, so as to adjust the first resistance of the resistance sequence so that the maximum current of the driving module defined by the adjusted feedback resistance corresponds to the device signal, wherein the connection device includes the The drive module, the resistor sequence and the switch array, the resistor sequence includes a plurality of the first resistors, and a plurality of the feedback resistors with different resistance values can be obtained by adjusting the first resistors of the resistor sequence. The feedback resistors with different resistance values can respectively define a plurality of different maximum currents of the driving module, the switch array includes a plurality of switches, and the switches can be turned on or off to adjust the first resistance of the resistor array Get the corresponding feedback resistor.
The method according to claim 14, wherein the device signal comprises a device voltage signal, and the controlling the switch of the switch array to turn on or off according to the device signal comprises:

Compare the voltage value of the device voltage signal with the voltage threshold provided by the voltage threshold providing circuit, and if the received voltage value is less than the first voltage threshold, control the first switch to the nth switch to close, so that the adjusted feedback The resistor is the first feedback resistor. If the received voltage value is less than the qth voltage threshold and greater than the q-1th voltage threshold, and q is greater than 1 and less than n or equal to n, then control the first switch to the th q-1 switches are turned on, and the qth switch to the nth switch are turned off, so that the adjusted feedback resistance is the qth feedback resistance; if the received voltage value is greater than the nth voltage threshold, the first switch is controlled When the nth switch is turned on, the adjusted feedback resistance is the n+1th feedback resistance;

Wherein, the voltage threshold providing circuit is used to provide n different voltage thresholds, the qth voltage threshold is greater than the voltage value of the qth device voltage signal, and is smaller than the voltage value of the q+1th device voltage signal, and q is greater than the voltage value of the qth device voltage signal. or equal to 1, and less than or equal to n; the number of the feedback resistors and the number of the first resistors are both m, and m is greater than 1, and the m first resistors include a zero resistor and n Except for the zero-numbered resistors, the resistance of the zero-numbered resistor is the resistance value of the first feedback resistor, and the zero-numbered resistor and p-1 non-zero-numbered resistors are connected in parallel to obtain the pth feedback resistors, the resistance of the p-th feedback resistor is greater than the resistance of the p+1-th feedback resistor and less than the resistance of the p-1-th feedback resistor, p is greater than or equal to 2, and n is greater than or equal to 1 , one end of each switch is connected to each non-zero resistor.
The method according to claim 15, wherein the receiving device signal comprises:

Control each of the n comparison units to receive the device voltage signal and a voltage threshold provided by the threshold voltage circuit, the connection device includes the n comparison units, and the output end of each comparison unit is connected to a switch;

The control of switching on or off the switch of the switch array according to the device signal includes:

controlling each comparison unit to compare the voltage value of the received device voltage signal with the voltage threshold;

If the voltage value received by the comparison unit is greater than the voltage threshold, the switch connected to the output end of the comparison unit is turned on, and if the voltage value received by the comparison unit is less than the voltage threshold, the switch is turned on The switch connected to the output of the comparison unit is closed.
The method of claim 14, wherein the method further comprises:

The duty cycle of the pulse width modulation signal of the driving module is determined according to the device signal.
A movable platform having a plurality of different screens, characterized in that the movable platform comprises the connecting device according to any one of claims 1-13.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor implements the process according to any one of claims 14-17 The control method of the connecting device.