Two-wire non-polarity bidirectional communication circuit and electronic equipment

Abstract

The present invention provides a two-wire non-polarity bidirectional communication circuit and an electronic device, wherein the communication circuit comprises a non-polarity signal processing circuit, which is used to receive a first signal and a second signal, and to form a first non-polarity signal and a second non-polarity signal after performing non-polarity processing on the first signal and the second signal; a signal demodulator, which receives the first non-polarity signal and the second non-polarity signal, and demodulates the first non-polarity signal and the second non-polarity signal, and outputs the demodulated signal to a signal processor, and the signal processor uses the demodulated signal to generate a modulation reference signal; a signal demodulator, which receives the modulation reference signal, and uses the modulation reference signal to modulate the first signal and the second signal. The electronic device comprises a first module and a second module, and the first module is provided with the above-mentioned two-wire non-polarity bidirectional communication circuit. The present invention can avoid the situation where the electronic device cannot work due to the reverse connection of the contacts of the first module and the second module.

Description

Technical Field

[0001] The present invention relates to the technical field of signal transmission, and in particular provides a two-wire non-polarity bidirectional communication circuit and an electronic device having the communication circuit. Background Art

[0002] Some existing electronic devices have multiple modules. For example, an electronic cigarette has a cartridge and a pipe. When the electronic cigarette is working, the cartridge and the pipe need to communicate, that is, data transmission is required. Some existing electronic cigarettes need to use three transmission lines to realize signal transmission between the cartridge and the pipe, resulting in a large number of transmission lines used. Other existing electronic cigarettes use two transmission lines to realize communication. For example, there are two contacts on the cartridge and the pipe respectively, but this existing method has polarity requirements for the signals transmitted by the two transmission lines, that is, one of the transmission lines is used to transmit a square wave signal with a DC bias, and the other transmission line is used to transmit a ground signal. The signals transmitted by the two transmission lines cannot be reversed. Therefore, this method requires that the signal cartridge and the pipe must be installed correctly, that is, the two contacts on the cartridge must be correctly connected to the two contacts on the pipe. If the contacts of the cartridge and the contacts of the pipe are reversed, the cartridge and the pipe will not be able to communicate normally.

[0003] However, users often fail to install the cartridge in the correct position during use, resulting in reverse connection of the contacts between the cartridge and the cigarette gun, causing the polarities of the signals transmitted by the two transmission lines to be opposite, thus affecting the use of the electronic cigarette.

[0004] In addition, after the cigarette cartridge or cigarette gun receives the signal transmitted by the other party, it is often necessary to demodulate the received signal. Since there are only two transmission lines for signal transmission between the cigarette cartridge and the cigarette gun, one of which is used to transmit square wave signals and the other is used to transmit ground signals, when detecting square waves, the existing technology uses a voltage comparator for detection, one input end of the voltage comparator receives the square wave signal, and the other input end needs to receive the reference voltage. Therefore, the existing electronic cigarette needs to set a reference voltage for detecting square wave signals. The setting of the reference voltage requires adding a module for generating the reference voltage on the circuit board. On the one hand, more electronic devices are required, resulting in an increase in production costs. On the other hand, more electronic devices lead to an increase in the area of ​​the circuit board, which is not conducive to the miniaturization of electronic cigarettes. Summary of the invention

[0005] The first object of the present invention is to provide a two-wire non-polarity bidirectional communication circuit in which signal transmission is independent of polarity.

[0006] A second object of the present invention is to provide an electronic device using the above two-wire non-polarity bidirectional communication circuit.

[0007] To achieve the first purpose of the present invention, the two-wire non-polarity bidirectional communication circuit provided by the present invention includes a non-polarity signal processing circuit, which is used to receive a first signal transmitted by a first signal transmission line and a second signal transmitted by a second signal transmission line, and to form a first non-polarity signal and a second non-polarity signal after non-polarity processing of the first signal and the second signal; a signal demodulator, which receives the first non-polarity signal and the second non-polarity signal, and demodulates the first non-polarity signal and the second non-polarity signal, and outputs the demodulated signal to a signal processor, and the signal processor uses the demodulated signal to generate a modulation reference signal; a signal demodulator, which receives the modulation reference signal, and uses the modulation reference signal to modulate the first signal and the second signal.

[0008] It can be seen from the above scheme that after the first signal and the second signal are processed without polarity by the non-polarity signal processing circuit, it can be ensured that the signal received by the signal demodulator must be a signal with correct polarity. Even if the user reverses the contacts of the first module and the second module, it will not affect the normal communication between the first module and the second module.

[0009] A preferred solution is that the non-polarity signal processing circuit includes a signal polarity processing circuit, and the signal polarity processing circuit includes a first switching device, a second switching device, a third switching device and a fourth switching device; the control ends of the first switching device and the fourth switching device receive the second signal, and the control ends of the second switching device and the third switching device receive the first signal; the first switching device and the third switching device receive the first signal, the second switching device and the fourth switching device receive the second signal, the first switching device and the second switching device output a first non-polarity signal, and the third switching device and the fourth switching device output an initial second non-polarity signal.

[0010] It can be seen that the on and off of the four switching devices are controlled respectively by the first signal and the second signal, and by setting the connection method of the four switching devices, it can be ensured that under any connection method between the first module and the second module, the first non-polarity signal and the initial second non-polarity signal output by the signal polarity processing circuit both meet the preset polarity requirements, thereby avoiding the situation where the electronic device cannot work normally due to the reverse connection of the contacts of the first module and the second module.

[0011] A further solution is that the first switch device, the second switch device, the third switch device and the fourth switch device are all switch devices that are turned on at a low level; or the first switch device, the second switch device, the third switch device and the fourth switch device are all switch devices that are turned on at a high level.

[0012] It can be seen that the four switch devices are all of the same type, which can ensure that the signal polarity processing circuit meets the preset signal logic requirements.

[0013] A further solution is that the non-polarity signal processing circuit further includes a dynamic reference voltage generator, which receives the initial second non-polarity signal, generates a second non-polarity signal, and outputs the second signal to the signal demodulator.

[0014] It can be seen that by adjusting the dynamic reference voltage of the initial second non-polarity signal, the level of the generated second non-polarity signal can be made more accurate, and the high level and low level of the square wave signal can be more obvious.

[0015] A further solution is that the dynamic reference voltage generator includes a voltage adjustment circuit and a voltage comparator; the first input terminal of the voltage comparator receives an initial second non-polarity signal, the voltage adjustment circuit receives the initial second non-polarity signal and outputs a signal to the second input terminal of the voltage comparator after voltage adjustment, and the output terminal of the voltage comparator outputs a second non-polarity signal.

[0016] It can be seen that by adjusting the voltage signal input to the voltage comparator through the voltage adjustment circuit, the square wave signal can be detected by using only one input signal, that is, the initial second non-polarity signal. The voltage comparator does not need to use a reference voltage, thereby saving the number of electronic components of the dynamic reference voltage generator, reducing the production cost of the electronic equipment, and saving the area of ​​the circuit board.

[0017] A further solution is that the voltage adjustment circuit is an RC integration circuit. It can be seen that the voltage of the initial second non-polarity signal can be adjusted by the RC integration circuit. For example, when the initial second non-polarity signal is at a high level, the voltage output by the RC integration circuit is lower than the voltage of the initial second non-polarity signal. When the initial second non-polarity signal is at a low level, the voltage output by the RC integration circuit is higher than the voltage of the initial second non-polarity signal. In this way, the second voltage comparator uses the voltage output by the RC integration circuit as a reference voltage for comparison, meeting the working requirements of voltage comparison.

[0018] A further solution is that the signal modulator includes a fifth switch device, a control end of the fifth switch device receives the modulation reference signal, and the fifth switch device is connected between the first signal transmission line and the second signal transmission line.

[0019] It can be seen that by turning on and off the fifth switch device, the first signal and the second signal can be short-circuited or disconnected, thereby achieving modulation of the first signal and the second signal.

[0020] Preferably, the fifth switch device is a switch device that is turned on at a high level or a switch device that is turned on at a low level.

[0021] A further solution is that the first signal is a square wave signal, and the second signal is a ground signal; or the first signal is a ground signal, and the second signal is a square wave signal.

[0022] To achieve the second objective, the electronic device provided by the present invention includes a first module and a second module. The first module is provided with the two-wire non-polarity bidirectional communication circuit. The first module and the second module communicate with each other through the two-wire non-polarity bidirectional communication circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural block diagram of the first module and the second module of the electronic device embodiment of the present invention.

[0024] Figure 2 It is a structural block diagram of an embodiment of a two-wire non-polarity bidirectional communication circuit of the present invention.

[0025] Figure 3 The present invention is a schematic diagram of a signal polarity processing circuit in a two-wire non-polarity bidirectional communication circuit embodiment.

[0026] Figure 4 It is an electrical schematic diagram of a dynamic reference voltage generator in an embodiment of a two-wire non-polarity bidirectional communication circuit of the present invention.

[0027] Figure 5 The diagram is an electrical schematic diagram of a voltage regulating circuit in an embodiment of a two-wire non-polarity bidirectional communication circuit of the present invention.

[0028] Figure 6 It is an electrical schematic diagram of a signal modulator in an embodiment of a two-wire non-polarity bidirectional communication circuit of the present invention.

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0030] The two-wire non-polarity bidirectional communication circuit of the present invention is applied to an electronic device having two modules, for example, the electronic device is an electronic cigarette, the electronic cigarette has a cartridge and a pipe, one of the cartridge and the pipe is a first module, and the other is a second module. Of course, the electronic device of the present invention is not limited to electronic cigarettes, but can also be other electronic devices having two modules, such as a smart phone and a headset, a laser printer and a toner chip, preferably, one of the modules is a main control module, and the other module is a controlled module.

[0031] See also Figure 1 , bidirectional communication is performed between the first module 11 and the second module 12, that is, the first module 11 sends a signal to the second module 12, and the second module 12 also sends a signal to the first module 11. In addition, the first module 11 is provided with two contacts, and the second module 12 is also provided with two contacts. When the two contacts of the first module 11 are respectively connected with the two contacts of the second module 12, the communication between the first module 11 and the second module 12 is realized.

[0032] A two-wire non-polarity bidirectional communication circuit is provided in the first module 11, see Figure 2 The two-wire non-polarity bidirectional communication circuit is provided with a signal modulator 21, a signal polarity processing circuit 22, a dynamic reference voltage generator 23, a signal demodulator 24 and a signal processor 25, wherein the signal polarity processing circuit 22 and the dynamic reference voltage generator 23 constitute the non-polarity signal processing circuit of this embodiment.

[0033] The two-wire non-polarity bidirectional communication circuit is provided with two signal transmission lines, one of which is LA, used to transmit the first signal AT, and the other is LB, used to transmit the second signal BT. Among them, one of the first signal AT and the second signal BT is a square wave signal, and the other is a ground signal, wherein the square wave signal is a square wave signal with a DC bias, that is, the low level signal of the square wave signal is a level signal higher than 0 volts. In this embodiment, the second module 12 outputs the first signal AT and the second signal BT to the first module 11, and the first module 11 modulates the first signal AT and the second signal BT through the signal modulator 21, and returns the modulated signal to the second module 12.

[0034] The signal modulator 21 is connected between the signal transmission line LA and the signal transmission line LB, and receives the first signal AT and the second signal BT. The signal modulator 21 also receives the modulation reference signal Sfb output by the signal processor 25, and uses the modulation reference signal Sfb to modulate the first signal AT and the second signal BT.

[0035] The signal polarity processing circuit 22 receives the first signal AT and the second signal BT, and performs non-polarity processing on the first signal AT and the second signal BT, thereby forming a first non-polarity signal and an initial second non-polarity signal. The first non-polarity signal is output to the signal demodulator 24, and the initial second non-polarity signal is output to the dynamic reference voltage generator 23. The dynamic reference voltage generator 23 generates a second non-polarity signal and outputs it to the signal demodulator 24.

[0036] After receiving the first non-polarity signal and the second non-polarity signal, the signal demodulator 24 demodulates the first non-polarity signal and the second non-polarity signal, and outputs the demodulated signal to the signal processor. In this embodiment, the signal processor 25 can be a device such as an MCU, and uses the demodulated signal to generate a modulation reference signal Sfb. Since the signal demodulator 24 and the signal processor 25 are both implemented by known signal demodulators and signal processors, their working principles are the same as those of existing signal demodulators and signal processors, and are not described in detail here.

[0037] See also Figure 3The signal polarity processing circuit 22 includes a first switch device N1, a second switch device N2, a third switch device N3 and a fourth switch device N4. In this embodiment, the first switch device N1, the second switch device N2, the third switch device N3 and the fourth switch device N4 are all high-level conductive switch devices, such as P-type field effect transistors.

[0038] from Figure 3 It can be seen that the control ends of the first switch device N1 and the fourth switch device N4 receive the second signal BT, and the control ends of the second switch device N2 and the third switch device N3 receive the first signal AT; the first switch device N1 and the third switch device N3 receive the first signal AT, and the second switch device N2 and the fourth switch device N4 receive the second signal BT. In addition, the first switch device N1 and the second switch device N2 output the first non-polarity signal VSS, and the third switch device N3 and the fourth switch device N4 output the initial second non-polarity signal VDD.

[0039] Specifically, the gate of the first switch device N1 and the gate of the fourth switch device N4 both receive the second signal BT, and the gate of the second switch device N2 and the gate of the third switch device N3 receive the first signal AT. When the first signal AT is at a high level and the second signal BT is at a low level, the second switch device N2 is turned on, the first switch device N1 is turned off, and the signal output by the first non-polarity signal VSS is the signal output by the second switch device N2. Since the second switch device N2 receives the second signal BT, the first non-polarity signal VSS is a low level signal. At the same time, the third switch device N3 is turned on, the fourth switch device N4 is turned off, and the signal of the initial second non-polarity signal VDD is the signal output by the third switch device N3. Since the third switch device receives the first signal AT, the signal of the initial second non-polarity signal VDD is a high level signal.

[0040] When the first signal AT is at a low level and the second signal BT is at a high level, the second switch device N2 is turned off, the first switch device N1 is turned on, and the signal output by the first non-polarity signal VSS is the signal output by the first switch device N1. Since the first switch device N1 receives the first signal AT, the first non-polarity signal VSS is a low level signal. At the same time, the third switch device N3 is turned off, the fourth switch device N4 is turned on, and the signal of the initial second non-polarity signal VDD is the signal output by the fourth switch device N4. Since the fourth switch device receives the second signal BT, the signal of the initial second non-polarity signal VDD is a high level signal.

[0041] It can be seen that no matter whether the first signal AT is a high level signal or a low level signal, and no matter whether BT is a high level signal or a low level signal, the first non-polarity signal VSS is a low level signal, and the initial second non-polarity signal VDD is a high level signal. Since the square wave signal of this embodiment is a square wave signal with a DC bias, that is, the low level of the square wave signal is also greater than 0 volts, and the ground signal is always 0 volts, therefore, no matter which of the first signal AT and the second signal BT is a square wave signal, the first non-polarity signal VSS is always a low level, that is, a ground signal, and the initial second non-polarity signal VDD is always a square wave signal.

[0042] Therefore, even if the user reverses the two contacts of the first module 11 and the two contacts of the second module 12, the first non-polarity signal VSS constantly outputs a low-level signal, that is, a ground signal, and the initial second non-polarity signal VDD constantly outputs a square wave signal. That is to say, even if the two contacts of the first module 11 and the two contacts of the second module 12 are reversed, the polarity of the signal received by the signal demodulator 24 is correct.

[0043] Of course, in actual application, the four switch devices can all be low-level signals, so that the conduction conditions of the four switch devices are opposite, but the same function can be achieved.

[0044] During the signal transmission between the first module 11 and the second module 12, the square wave signal may be interfered by the outside world, such as electromagnetic interference, which may cause the waveform of the square wave signal to be distorted. In order to ensure that the waveform of the square wave signal received by the signal demodulator 24 is relatively regular, the initial second non-polarity signal VDD needs to be shaped by the dynamic reference voltage generator 23 to form a second non-polarity signal.

[0045] See also Figure 4 The dynamic reference voltage generator 23 includes a voltage adjustment circuit 28 and a voltage comparator U3. The voltage adjustment circuit 28 receives the initial second non-polarity signal VDD, adjusts the voltage of the initial second non-polarity signal VDD, and outputs the adjusted signal to the second input terminal, i.e., the reverse input terminal, of the voltage comparator U3. The first input terminal of the voltage comparator U3 receives the initial second non-polarity signal VDD, the first input terminal of the voltage comparator U3 is the positive input terminal, and the signal output by the voltage comparator U3 is the second non-polarity signal.

[0046] The voltage adjustment circuit 28 adjusts the voltage of the initial second non-polarity signal VDD to generate a voltage signal between the high level and the low level of the initial second non-polarity signal VDD. For example, the high level of the initial second non-polarity signal VDD is VDD_H, and the low level of the initial second non-polarity signal VDD is VDD_L. Then, the level of the signal output by the voltage adjustment circuit 28 is between VDD_H and VDD_L.

[0047] Specifically, the voltage adjustment circuit 28 is an RC integration circuit, see Figure 5 The voltage adjustment circuit 28 includes a resistor R1 and a capacitor C1. Of course, the specific structure of the RC integration circuit is not limited to Figure 5 The structure shown can also be implemented by other known RC integration circuits. When the initial second non-polarity signal VDD is at a high level VDD_H, due to the effect of the capacitor C1, the voltage of the signal output by the voltage adjustment circuit 28 is lower than the high level VDD_H; when the initial second non-polarity signal VDD is at a low level VDD_L, due to the effect of the capacitor C1, the voltage of the signal output by the voltage adjustment circuit 28 is higher than the low level VDD_L.

[0048] Thus, when the initial second non-polarity signal VDD is at a high level VDD_H, the first input terminal of the voltage comparator U3 is connected to the initial second non-polarity signal VDD, and the second input terminal receives the signal output by the voltage adjustment circuit 28. Therefore, the signal voltage at the first input terminal is higher than the voltage of the signal at the second input terminal, and therefore, the voltage comparator U3 outputs a high-level signal. When the initial second non-polarity signal VDD is at a low level VDD_L, the first input terminal of the voltage comparator U3 is connected to the initial second non-polarity signal VDD, and the second input terminal receives the signal output by the voltage adjustment circuit 28. Therefore, the signal voltage at the first input terminal is lower than the voltage of the signal at the second input terminal, and therefore, the voltage comparator U3 outputs a low-level signal.

[0049] It can be seen that the signal output by the voltage comparator U3 follows the high and low level changes of the initial second non-polarity signal VDD, that is, the formed second non-polarity signal is consistent with the high and low levels of the initial second non-polarity signal VDD. However, since the high and low level voltages of the signal output by the voltage comparator U3 remain stable and the high and low level switching is sensitive, the waveform of the output second non-polarity signal is more regular, and the shaping of the signal waveform is achieved.

[0050] The signal demodulator 24 uses the first non-polarity signal and the second non-polarity signal to perform demodulation to obtain a demodulated signal, and outputs the demodulated signal to the signal processor 25. The signal processor 25 forms an adjustment reference signal Sfb, and the adjustment reference signal Sfb is output to the signal modulator 21. Figure 6 The signal modulator 21 has a fifth switch device N5, which is a switch device that is turned on at a high level, such as a P-type field effect transistor. The gate of the fifth switch device N5 receives the adjustment reference signal Sfb, and the drain and source are respectively connected to the first signal transmission line LA and the second signal transmission line LB.

[0051] When the adjustment reference signal Sfb is a high level signal, the fifth switch device N5 is turned on, and the first signal AT and the second signal BT are short-circuited. Since one of the first signal AT and the second signal BT is a ground signal, when the fifth switch device N5 is turned on, it is equivalent to the square wave signal being short-circuited, and the signal output by the signal modulator 21 is two-way ground signal. The signal output by the signal modulator 21 is received by the second module 12, so the signal received by the second module 12 is two-way ground signal.

[0052] When the adjustment reference signal Sfb is a low level signal, the fifth switch device N5 is turned off, the first signal AT and the second signal BT are not short-circuited, so the waveforms of the first signal AT and the second signal BT do not change, and are directly returned to the second module 12. Therefore, by adjusting the level of the adjustment reference signal Sfb, the modulation of the first signal AT and the second signal BT can be achieved.

[0053] Of course, the fifth switch device may also be a device that is turned on at a low level, which does not affect the modulation of the first signal AT and the second signal BT.

[0054] It can be seen that by setting a non-polarity signal processing circuit, even if the contacts of the first module 11 and the second module 12 are reversely connected, the signal transmission between the two modules will not be affected, which is convenient for users. In addition, since the dynamic reference voltage generator can detect the square wave signal using only one input signal, the electronic devices used in the circuit can be reduced, the production cost of the electronic equipment can be reduced, and the area of ​​the circuit board can be saved, which is conducive to the miniaturization of the electronic equipment.

[0055] Finally, it should be emphasized that the present invention is not limited to the above-mentioned embodiments. For example, changes in the type of switching devices used in the signal polarity processing circuit, or changes in the specific circuit structure of the modulation circuit, should also be included in the scope of protection of the claims of the present invention.

Claims

1. Two-wire non-polarity bidirectional communication circuit, It is characterized in that include: A non-polarity signal processing circuit receives a first signal transmitted by a first signal transmission line and a second signal transmitted by a second signal transmission line, and performs non-polarity processing on the first signal and the second signal to form a first non-polarity signal and a second non-polarity signal; A signal demodulator receives the first non-polarity signal and the second non-polarity signal, demodulates the first non-polarity signal and the second non-polarity signal, and outputs the demodulated signal to a signal processor, and the signal processor uses the demodulated signal to generate a modulation reference signal; a signal modulator, receiving the modulation reference signal, and using the modulation reference signal to modulate the first signal and the second signal; The non-polarity signal processing circuit includes a signal polarity processing circuit, and the signal polarity processing circuit includes a first switch device, a second switch device, a third switch device and a fourth switch device; The control ends of the first switch device and the fourth switch device receive the second signal, and the control ends of the second switch device and the third switch device receive the first signal; The first switch device and the third switch device receive the first signal, the second switch device and the fourth switch device receive the second signal, the first switch device and the second switch device output the first non-polarity signal, and the third switch device and the fourth switch device output an initial second non-polarity signal; The non-polarity signal processing circuit further includes a dynamic reference voltage generator, which receives the initial second non-polarity signal, generates the second non-polarity signal and outputs it to the signal demodulator; The dynamic reference voltage generator includes a voltage adjustment circuit and a voltage comparator; the first input terminal of the voltage comparator receives the initial second non-polarity signal, the voltage adjustment circuit receives the initial second non-polarity signal and outputs a signal to the second input terminal of the voltage comparator after voltage adjustment, and the output terminal of the voltage comparator outputs the second non-polarity signal.

2. The two-wire non-polarity bidirectional communication circuit according to claim 1, Features: The first switch device, the second switch device, the third switch device and the fourth switch device are all switch devices that are turned on at a low level; or The first switching device, the second switching device, the third switching device and the fourth switching device are all switching devices that are turned on at a high level.

3. The two-wire non-polarity bidirectional communication circuit according to claim 2, Features: The voltage adjustment circuit is an RC integration circuit.

4. The two-wire non-polarity bidirectional communication circuit according to any one of claims 1 to 3, Features: The signal modulator includes a fifth switch device, a control end of the fifth switch device receives the modulated reference signal, and the fifth switch device is connected between the first signal transmission line and the second signal transmission line.

5. The two-wire non-polarity bidirectional communication circuit according to claim 4, Features: The fifth switch device is a switch device that is turned on at a high level or a switch device that is turned on at a low level.

6. The two-wire non-polarity bidirectional communication circuit according to any one of claims 1 to 3, Features: The first signal is a square wave signal, and the second signal is a ground signal; or The first signal is a ground signal, and the second signal is a square wave signal.

7. An electronic device, comprising a first module and a second module, It is characterized in that The first module is provided with a two-wire non-polarity bidirectional communication circuit as claimed in any one of claims 1 to 6, and the first module and the second module communicate with each other through the two-wire non-polarity bidirectional communication circuit.

Images