Load control circuit, chip, communication circuit and interactive control method

Abstract

Disclosed in the present application are a load control circuit, a chip, a communication circuit and an interactive control method. The load control circuit comprises a rectifier bridge circuit, a modulation circuit, an energy control module, and a first controller, wherein the rectifier bridge circuit is connected to the modulation circuit; the rectifier bridge circuit is connected to the energy control module; the first controller is connected to both the modulation circuit and the energy control module; the rectifier bridge circuit is used for rectifying an input signal and outputting a rectification result; an input signal port in the rectifier bridge circuit is used for connecting in parallel to a load element external to the load control circuit; the first controller is used for causing a current change in the rectifier bridge circuit by means of controlling the modulation circuit, so as to drive a current change in the load element to perform modulation; and the energy control module is used for charging, by means of the rectification result, a capacitor externally connected to the load control circuit, and for gating the capacitor externally connected to the load control circuit to supply power to the modulation circuit.

Description

Load control circuit, chip, communication circuit and interactive control method TECHNICAL FIELD

[0001] The present application relates to the technical field of load control circuit, and particularly relates to a load control circuit, a chip, a communication circuit and an interactive control method. BACKGROUND

[0002] The encryption chip has a wide range of uses to protect products. The common encryption chip is not connected in parallel with the load. This application is more flexible. The communication and power supply of the encryption chip need to be powered separately, or the data and power supply are multiplexed, and the power supply is realized through a pull-up resistor. The encryption chip maintains the power supply through a capacitor, and the data is transmitted through the capacitor. The Chinese invention patent with the patent application number CN202222357787.X discloses a communication circuit that is exactly used for the data modulation and demodulation communication of this kind of encryption chip. The communication circuit modulates the data to be transmitted by turning on and off the switch under the control of a certain time sequence. The chip that needs to receive data demodulates the data by using the current change on the resistor connected to the chip, so as to realize the communication between the two chips. The communication circuit disclosed in the foregoing Chinese invention patent realizes the modulation and demodulation of data by relying on the current change. The communication process is not affected by the large current generated by the terminal load when the terminal load works. The communication does not need to close the load working function. However, the problem that the input negative voltage cannot be recognized by the controller is not considered. There is also the problem of controller charging and maintaining the stable work of the controller. SUMMARY

[0003] The present application discloses a load control circuit, a chip, a communication circuit and an interactive control method. The specific technical solutions are as follows:

[0004] The load control circuit comprises a rectifier bridge circuit, a modulation circuit, an energy control module and a first controller; the rectifier bridge circuit is connected with the modulation circuit; the rectifier bridge circuit is connected with the energy control module; the first controller is connected with the rectifier bridge circuit, the modulation circuit and the energy control module respectively; the rectifier bridge circuit is used for rectifying the input signal to obtain a rectification result; wherein, the port of the input signal in the rectifier bridge circuit is used for connecting the load element outside the load control circuit in parallel; the first controller is used for causing the current change in the rectifier bridge circuit by controlling the modulation circuit to drive the current change in the load element to modulate; the energy control module is used for charging the capacitor connected outside the load control circuit through the rectification result and selecting the capacitor connected outside the load control circuit to supply power to the modulation circuit. In summary, the load control circuit disclosed in the application can identify the input signal generated by the positive and negative connection of the external device, can stably supply power to the parallelly connected load element and can modulate by the modulation circuit to maintain normal data communication when the load element works, and can store and supply power through the external capacitor to enhance the expandability and functional multiplicity of the peripheral components of the load control circuit, thereby solving the problem of increasing the number of peripheral components on the basis of the prior art, realizing the consideration of information interaction and charging by using the load parallel connection to simplify the circuit manufacturing cost, and thus greatly reducing the manufacturing cost of the product.

[0005] A chip is internally provided with the load control circuit. The chip integrates the rectifier bridge circuit, can identify the positive and negative signals generated by the positive and negative connection of the external device to the first input end and the second input end, can stably supply power to the parallelly connected load element, modulates by the modulation circuit to maintain normal data communication when the load element works, stores and supplies power through the external capacitor to enhance the expandability and functional multiplicity of the peripheral components of the chip, thereby solving the problem of increasing the number of peripheral components caused by the modulation and demodulation of data and reducing the chip manufacturing cost, and thus reducing the manufacturing cost of the product assembled with the chip.

[0006] The communication circuit includes a first circuit and a second circuit; the first circuit includes the chip or the load control circuit; the second circuit includes a second controller, a power supply, a first switch tube and a second switch tube; the first circuit further includes a load element and a capacitor; in the load control circuit, a rectifier bridge circuit is provided with a first input end, a second input end, a first rectifier output end and a second rectifier output end, the energy control module is provided with a signal input end and a signal output end, the signal input end of the energy control module is connected with the first rectifier output end of the rectifier bridge circuit, and the capacitor is connected in parallel to the signal output end of the energy control module and the second rectifier output end of the rectifier bridge circuit; the load element is connected in parallel across the first input end and the second input end; the power supply is connected to the first input end through the first switch tube and the second switch tube respectively; the second controller is connected with the second input end, and provides a data path for the second controller to communicate with the first circuit; the second controller is used to control the power supply to charge the first circuit by turning on the first switch tube and / or the second switch tube before the second controller communicates with the first circuit; the second controller is used to detect whether a synchronization reset signal sent by the first circuit is received when the power supply charges the first circuit, and keep the second switch tube on and start to communicate with the first circuit when the synchronization reset signal sent by the first circuit is detected; wherein the capacitor keeps powering the load control circuit when the second controller communicates with the first circuit. In summary, the application uses the on-off of the two switch tubes to switch between charging the first circuit and communicating with the first circuit, guarantees the work of the load element connected in parallel and the modulation and interaction of the external communication signal, and combines the load control circuit included in the first circuit to identify the input signal generated by the external device and the circuit basis for modulation, so as to maintain normal data communication when the load element works by simplifying the circuit design, and reduce the wire and the thimble for the interaction between the circuit as the host and the circuit as the slave.

[0007] An interactive control method, an execution subject of the interactive control method is a second controller in the communication circuit; the interactive control method comprises the following steps: step 11, the second controller controls the power supply to charge the first circuit by turning on the first switch tube and / or the second switch tube; then step 12 is executed; step 12, it is judged whether the synchronization reset signal sent by the first circuit is received, if yes, step 13 is executed, otherwise the interactive control method is ended; step 13, the second controller sends the first one data packet to the first circuit, and then step 14 is executed after the sending is completed; step 14, the second controller receives the first two data packets sent by the first circuit, and then step 15 is executed after the receiving is completed; step 15, it is judged whether the first two data packets are the same as the first one data packet, if yes, step 13 is executed, otherwise the interactive control method is ended. According to the above steps 11-15, the controller (second controller) on the second circuit side is taken as the execution subject, the on and off of the second switch tube, the on and off of the switch unit on the first circuit side and the data interaction between the second circuit and the first circuit dominated by the synchronization reset signal are controlled, and based on the difference between the data packets exchanged between the second circuit and the first circuit, it is verified whether the communication circuit works normally to control the second circuit to continuously send data packets to the first circuit, maintain the data communication operation between the second circuit and the first circuit, and stop the data communication operation between the second circuit and the first circuit in the case that the synchronization reset signal is not received and the data packets exchanged between the second circuit and the first circuit are not the same.

[0008] The application discloses an interactive control method, and an execution subject of the interactive control method is a first controller in a communication circuit; after a second controller controls a power supply to charge a first circuit by turning on a second switch tube and / or a first switch tube, the interactive control method comprises the following steps: step 21, the first controller detects whether a synchronization reset signal sent by a second circuit is received, if yes, step 22 is executed, and if not, the interactive control method is ended; step 22, the first controller sends a second data packet to the second circuit, and after the sending is completed, step 23 is executed; step 23, the first controller receives a second data packet sent by the second circuit, and after the receiving is completed, step 24 is executed; step 24, it is judged whether the second data packet is same as the second data packet, if yes, step 22 is executed, and if not, the interactive control method is ended. According to the steps 21 to 24, the controller (the first controller) on the first circuit side is taken as an execution subject, the data interaction between the first circuit and the second circuit is dominated by controlling the turn-on and turn-off of a switch unit to modulate a load, and based on the difference between the data packets exchanged between the second circuit and the first circuit, it is judged whether the communication circuit works normally to control the first circuit to continuously send data packets to the second circuit, maintain the data communication operation between the first circuit and the second circuit, and stop the data communication operation between the first circuit and the second circuit in the case that the synchronization reset signal is not received and the data packets exchanged between the first circuit and the second circuit are different. BRIEF DESCRIPTION OF DRAWINGS

[0009] Fig. 1 is a structural schematic diagram of a load control circuit disclosed by an embodiment of the application.

[0010] Fig. 2 is a structural schematic diagram of a communication circuit disclosed by an embodiment of the application.

[0011] Fig. 3 is a flow schematic diagram of an interactive control method with a first controller as an execution subject disclosed by an embodiment of the application.

[0012] Fig. 4 is a flow schematic diagram of an interactive control method with a second controller as an execution subject disclosed by an embodiment of the application.

[0013] Fig. 5 is a schematic diagram of a synchronization reset signal occupying 4 pulses, a signal waveform with a data bit of 0 and a signal waveform with a data bit of 1 transmitted between a first circuit and a second circuit. DETAILED DESCRIPTION

[0014] The specific embodiments of the present application will be further described with reference to the drawings. In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0015] Considering the load power of the circuit, the design cost, the signal identification and the charging problem, the load control circuit disclosed in the present application works through parallel loads and works under the condition that the functions of data communication and power supply are normally operated, so that a multiplexing circuit with charging energy storage and normal power supply can be formed through an external capacitor. As shown in FIG. 1, the load control circuit disclosed in the present application comprises a rectifier bridge circuit, a modulation circuit, an energy control module and a first controller, the first controller is connected with the rectifier bridge circuit, the modulation circuit and the energy control module respectively; wherein the rectifier bridge circuit is a circuit with upper and lower half bridge arms connected by a switch tube, the modulation circuit relies on the internal switch unit to change the current size to play a signal modulation role; the energy control module is internally provided with a switch network to turn on or cut off the power supply, and can also perform voltage boosting on the input signal through a boost circuit such as a charge pump; the rectifier bridge circuit, the modulation circuit and the energy control module are all controlled by the control signal sent by the first controller.

[0016] In the present application, the rectifier bridge circuit is connected with the modulation circuit, and the rectifier bridge circuit is connected with the energy control module. It can be understood that the signal input into the load control circuit is rectified by the rectifier bridge circuit, and is adjusted by the energy control module to maintain the normal operation of the modulation circuit, including normal power supply and normal signal modulation communication.

[0017] The rectifier bridge circuit is used for rectifying the input signal and outputting the rectification result. The rectifier bridge circuit internally has a rectifier bridge to realize the foolproof function, that is, the input signal does not need to be pre-classified as positive or negative polarity, and the positive and negative plug-in devices connected to the load control circuit can be recognized by the first controller. Therefore, the input signal, whether it is a positive data signal, a negative data signal, a positive power signal or a negative power signal, can be processed by the modulation circuit and the energy control module after being rectified by the rectifier bridge circuit, and the positive and negative of the input signal can be detected by the first controller.

[0018] The port of the input signal in the rectifier bridge circuit is used to connect the load element outside the load control circuit in parallel, so that the rectifier bridge circuit of the application can switch through the switch tube, for example, from the charging state to the data communication state, without affecting the operation of the load element, and also solves the problem of positive and negative reverse connection.

[0019] The first controller is used to cause current change in the rectifier bridge circuit by controlling the modulation circuit, including turning on or off for a period of time by the switching mechanism in the modulation circuit, changing the current of the path connected with the rectifier bridge circuit, causing current change in the rectifier bridge circuit, feeding back to the current limiting resistor in the modulation circuit, obtaining a pulse signal corresponding to the time length, and since the port of the input signal in the rectifier bridge circuit is connected in parallel with the load element outside the load control circuit, the current change in the rectifier bridge circuit drives the current change in the load element, so as to perform modulation, that is, the first controller controls the modulation circuit to perform load modulation, which is equivalent to data encoding through load modulation, and can also be understood as timing adjustment of the voltage of the load to obtain high and low levels with a corresponding level width (the level time length obtained by timing), so as to obtain an encoded level signal through modulation, and realize data interaction by using encoded information.

[0020] Based on the connection of the modulation circuit with the rectifier bridge circuit and the parallel connection of the load element with the rectifier bridge circuit, the rectification result of the external input signal of the rectifier bridge circuit can contribute to the modulation circuit, and the external input signal of the rectifier bridge circuit also acts on the aforementioned parallelly connected load element partially or entirely; in addition, normal power supply work can be maintained based on the action of the energy control module, so as to guarantee the power supply work and external data communication function of the load control circuit. Based on this, the circuit design can be simplified, and the wires and pins required for data interaction can be reduced.

[0021] The load modulation mode is to let the built-in resistor consume current and cut off the path by the switching mechanism in the modulation circuit, so as to perform signal modulation, and the working current and voltage state of the external feedback load element. The application supports load parallel connection, and combines the rectifier bridge circuit to perform load modulation, thereby reducing the circuit cost.

[0022] The energy control module is configured to charge the capacitor connected to the load control circuit through the rectified result and to enable the capacitor connected to the load control circuit to supply power to the modulation circuit. By raising the voltage of the rectified result or directly transmitting to the capacitor, the capacitor is charged to a certain amount of electricity, and the amount of electricity of the capacitor is sufficient to support the normal operation of the load control circuit, including driving the modulation circuit to perform modulation work and ensuring the power supply of the first controller. Therefore, the internal switch network of the energy control module is a switch network for the capacitor, or a charge pump is arranged to adjust the voltage and supply the amount of electricity of the capacitor in time, which can meet the charging demand of the capacitor and the power supply voltage demand of the modulation circuit and the first controller.

[0023] The capacitor connected to the load control circuit serves as an energy storage capacitor, which supplies power to the first controller and the modulation circuit after being charged; the data communication and power supply of the load control circuit can be separately powered, or the data communication and power supply share the same capacitor, which can not only achieve power supply through the series connection of the pull-up resistor, but also maintain the power supply of the first controller through the capacitor when the first controller transmits data.

[0024] In summary, the load control circuit disclosed in the present application can not only identify the input signal generated by the external device in positive and negative connection, but also can stably supply power to the parallelly connected load element and modulate the load element through the modulation circuit to maintain normal data communication when the load element works. Moreover, the load control circuit can store and supply electricity through the external capacitor, enhance the expandability and functional multiplicity of the peripheral components of the load control circuit, and thus solve the problem of increasing the number of peripheral components on the basis of the prior art, realize the use of load parallel connection to consider information interaction and charging to simplify the manufacturing cost of the circuit, and thus greatly reduce the manufacturing cost of the product.

[0025] As an embodiment, the modulation circuit comprises a current-limiting resistor and a switching unit, the rectifier bridge circuit is provided with a first rectifier output end and a second rectifier output end; one end of the switching unit is connected with the first rectifier output end, the other end of the switching unit is connected with one end of the current-limiting resistor, the other end of the current-limiting resistor is connected with the second rectifier output end, the first rectifier output end and the second rectifier output end are used for outputting a rectification result, the rectifier bridge circuit is further provided with a first input end and a second input end, positive signals or negative signals input by the first input end and the second input end are output by the first rectifier output end and the second rectifier output end after rectification, and the change of current in the rectifier bridge circuit is fed back to the current-limiting resistor. As shown in FIG. 1, the switching unit is a switching element SW-S controlled by a first controller MCU1, one end of the switching element SW-S is connected in series with the current-limiting resistor Rs, and the series connection of the switching element SW-S and the current-limiting resistor Rs is regarded as parallel connection to the first rectifier output end of the rectifier bridge circuit; and then the first controller is triggered to demodulate according to the current change in the current-limiting resistor.

[0026] In the embodiment, when the switching unit changes from off to on, current appears in the current-limiting resistor, the current-limiting resistor samples voltage, causes current change in the rectifier bridge circuit, drives current change in the load element, and can be fed back to the first input end and the second input end to perform modulation, and the modulation result can be transmitted to a communication chip connected to the first input end and the second input end; when the switching unit changes from on to off, no current passes through the current-limiting resistor, and current still exists in the rectifier bridge circuit and the load element, which causes current change in the rectifier bridge circuit, drives current change in the load element, and can be fed back to the first input end and the second input end to perform modulation. Then, based on the signals of the first input end and the second input end, the first controller can combine low level of the first preset time length and high level of the second preset time length into data bit 1 or data bit 0, implement bit data coding, and realize modulation.

[0027] As shown in FIG. 1, when the switching element SW-S is on, the current-limiting resistor Rs converts bits into corresponding data bits by using voltage values generated by consumed current, thereby helping to complete data modulation. The modulation circuit controls the on and off of the switching unit through a certain timing sequence, so that the current in the modulation circuit changes, thereby modulating the data to be transmitted between large and small currents, reducing the problem of excessive energy consumption caused by large current modulation and the signal being easily disturbed.

[0028] Therefore, the first controller MCU1 changes the current in the current-limiting resistor Rs between a large current and a small current through the switching unit, thereby playing a role in modulating data, wherein the large current or the small current is a relative concept, and there is no specific dividing line between them, for example, the large current is 3A, and the small current is 100mA.

[0029] The other controller in communication with the first controller can demodulate and restore the data by recording the change rule of the current flowing through the current-limiting resistor, thereby achieving the purpose of communication.

[0030] The modulation circuit realizes the data modulation function by relying on a single switch and a single resistor, and the circuit structure is simple, which is conducive to the miniaturization of the terminal where the load control circuit is located, and also reduces the cost. When the load control circuit needs to transmit data to an external controller, the data is modulated by turning on and off the switching unit, thereby achieving the purpose of data encoding. Then, the control module that needs to receive data demodulates the data by using the current change on a resistor connected thereto, thereby realizing communication between two controllers. Here, the controller can adopt a chip.

[0032] It should be noted that when the load control circuit is normally working, the switching unit is turned on to enhance the current output capability so as to provide a rated working current for the load element. The load control circuit relies on the change of the current to realize data modulation communication, and the power provided for the load element is not interrupted during communication, thereby improving the use experience of the heating terminal or other load terminal where the load control circuit is located.

[0033] On the basis of the above embodiment, the load control circuit is provided with a power supply end and a ground end, and the energy control module is used to connect the power supply end. As shown in FIG. 1, the load control circuit is provided with a power supply end VCC and a ground end GND, the drain end of the second lower switch tube MP2 and the drain end of the first lower switch tube MP1 are connected to the ground end GND, and the energy control module is connected to the power supply end VCC. In FIG. 2, the capacitor connected to the load control circuit is a capacitor C connected in parallel to the power supply end VCC and the ground end GND, so as to store the power supply capacity through the capacitor C. Since the common connection end of the drain end of the second lower MOS tube MP2 and the drain end of the first lower MOS tube MP1 is connected to the ground end GND, and the energy control module is connected to the power supply end VCC, the power quantity rectified and output by the rectifier bridge circuit is kept to the capacitor, so that the power quantity stored in the capacitor connected to the load control circuit is used to continuously supply power to the load control circuit.

[0034] As an embodiment, the energy control module is internally integrated with a charge pump; a signal input end of the charge pump is a signal input end of the energy control module; a signal output end of the charge pump is a signal output end of the energy control module. The signal input end of the charge pump is connected with the first rectification output end of the rectifier bridge circuit, and the signal output end of the charge pump is connected with the power supply end; the charge pump is configured to boost the rectification result and output the boosted result to a capacitor externally connected to the load control circuit, and the boosted result of the charge pump is retained in the capacitor. Illustratively, the charge pump is configured to boost the voltage at the signal input end (the aforementioned first rectification output end), for example, to 3V by the charge pump, and the capacitor can be charged to obtain a charging voltage of 3V; at this time, a channel exists between the modulation circuit and the capacitor, and the charging voltage of the capacitor can drive the modulation circuit to work normally.

[0035] Alternatively, the charge pump is configured to output the rectification result to the capacitor externally connected to the load control circuit without adjustment, i.e., directly output the rectification result to the capacitor externally connected to the load control circuit, so as to charge the capacitor externally connected to the load control circuit; the capacitor externally connected to the load control circuit is a capacitor connected in parallel to the power supply end and the ground end, so as to store the power supply amount by the capacitor.

[0036] It can be understood that the charge pump is further configured to select the circuit channel between the capacitor externally connected to the load control circuit and the modulation circuit, so that the capacitor externally connected to the load control circuit supplies power to the modulation circuit when being charged to a preset voltage; therefore, the charge pump can be configured to switch between supplying power and cutting off power to the capacitor externally connected to the load control circuit, so as to drive the current in the modulation circuit and the rectifier bridge circuit to change.

[0037] As an embodiment, the energy control module is internally integrated with a switch network; a signal input end of the switch network is connected with the first rectification output end of the rectifier bridge circuit, and a signal output end of the switch network is connected with the power supply end, so as to select the circuit channel between the modulation circuit, the rectifier bridge circuit and the capacitor externally connected to the load control circuit; the switch network is configured to switch between supplying power and cutting off power to the capacitor externally connected to the load control circuit, so as to drive the current in the modulation circuit and the rectifier bridge circuit to change, so that the rectification result charges the capacitor externally connected to the load control circuit, i.e., the rectification result is directly output to the capacitor without adjustment by the energy control module, so that the capacitor externally connected to the load control circuit supplies power to the modulation circuit when being charged to a preset voltage; the signal input end of the switch network is a signal input end of the energy control module; the signal output end of the switch network is a signal output end of the energy control module.

[0038] Therefore, the energy control module in the embodiment corresponds to a power switch, which is used to select the circuit path between the modulation circuit and the capacitor connected to the load control circuit, so that the capacitor connected to the load control circuit keeps the preset voltage to supply power to the modulation circuit when charging to the preset voltage. The preset voltage is preferably between 3 and 5 V.

[0039] In summary, by connecting the capacitor between the rectifier bridge circuit and the energy control module, the data modulation communication and the charging of the circuit module are not affected by the positive and negative of the input voltage. In the communication mode, the first controller starts the charge pump to boost and save to the capacitor (equivalent to the charging capacitor), so as to obtain the working voltage required by the modulation circuit for data modulation. In the charging mode, the first controller does not start the charge pump but directly selects the path between the capacitor and the rectifier bridge circuit and the modulation circuit, and even does not need to set a special boost circuit to directly store the power supply to the capacitor. Thus, the function reuse of the energy control module is realized.

[0040] As an embodiment, the rectifier bridge circuit includes a first upper switch tube, a second upper switch tube, a first lower switch tube, and a second lower switch tube. The first transmission end of the first upper switch tube and the first transmission end of the second upper switch tube are commonly connected to the energy control module. The control end of the first upper switch tube is connected to the control end of the first lower switch tube, and the second transmission end of the second upper switch tube is connected to the second transmission end of the first lower switch tube. The control end of the second upper switch tube is connected to the control end of the second lower switch tube, and the second transmission end of the second upper switch tube is connected to the second transmission end of the second lower switch tube. The control end of the first lower switch tube is connected to the second transmission end of the second lower switch tube. The control end of the second lower switch tube is connected to the second transmission end of the first lower switch tube. The first transmission end of the second lower switch tube is connected to the first transmission end of the first lower switch tube. The first transmission end of the first upper switch tube and the first transmission end of the second upper switch tube are commonly connected to the first rectifier output end, and the first transmission end of the second lower switch tube and the first transmission end of the first lower switch tube are commonly connected to the second rectifier output end. The first transmission end of the second lower switch tube and the first transmission end of the first lower switch tube are connected to the ground end. As shown in FIG. 1, the common connection end of the drain end of the first upper MOS tube MN1 and the drain end of the second upper MOS tube MN2 is the first rectifier output end, and the common connection end of the drain end of the second lower MOS tube MP2 and the drain end of the first lower MOS tube MP1 is the second rectifier output end.

[0041] In the embodiment, the first upper switch tube and the first lower switch tube are connected in sequence to form a bridge arm, and the first upper switch tube or the first lower switch tube is regarded as a rectifier switch tube. The second upper switch tube and the second lower switch tube are connected in sequence to form another bridge arm, and the second upper switch tube or the second lower switch tube is regarded as a rectifier switch tube. Thus, a rectifier bridge is connected, and the foolproof function (the input does not need to distinguish the positive and negative signs) is realized.

[0042] The first upper switch tube, the second upper switch tube, the first lower switch tube and the second lower switch tube can all be MOS tubes or triodes or diodes, and the specific polarity is different due to the connection mode, and a capacitor can also be connected in parallel.

[0043] In some embodiments, the first upper switch tube and the second upper switch tube are both NMOS tubes, and the first lower switch tube and the second lower switch tube are both PMOS tubes, wherein the first transmission end is the drain end, the second transmission end is the source end, and the control end is the gate end; or the first upper switch tube and the second upper switch tube are both PMOS tubes, and the first lower switch tube and the second lower switch tube are both NMOS tubes, wherein the first transmission end is the source end, the second transmission end is the drain end, and the control end is the gate end; wherein each control end is controlled by a signal input from the first input end and a signal input from the second input end. The components connected to the first input end and the second input end can be a load element, which does not need to distinguish between positive and negative polarity when connected, that is, whether connected in positive or negative, the rectification result can be output through the first rectification output end and the second rectification output end of the rectifier bridge circuit, and recognized by the first controller and the second controller.

[0044] As shown in FIG. 1, the first upper switch tube MN1 and the second upper switch tube MN2 are both NMOS tubes, the first lower switch tube MP1 and the second lower switch tube MP2 are both PMOS tubes, the first upper switch tube MN1 and the second upper switch tube MN2 are connected in turn from top to bottom, and the first lower switch tube MP1 and the second lower switch tube MP2 are connected in turn from top to bottom; the common end between the gate end of the first upper switch tube MN1 and the gate end of the first lower switch tube MP1 is connected with the common end between the source end of the second upper switch tube MN2 and the source end of the second lower switch tube MP2; the common end between the gate end of the second upper switch tube MN2 and the gate end of the second lower switch tube MP2 is connected with the common end between the source end of the first upper switch tube MN1 and the source end of the first lower switch tube MP1; thereby forming a rectifier bridge by the four interconnected MOS tubes.

[0045] As shown in FIG. 1, the load control circuit is provided with a first input end IN1 and a second input end IN2, the second transmission end of the first upper MOS tube MN1 and the second transmission end of the first lower MOS tube MP1 are connected to the first input end IN1, and the second transmission end of the second upper MOS tube MN2 and the second transmission end of the second lower MOS tube MP2 are connected to the second input end IN2; the rectifier bridge circuit inputs positive data signals, negative data signals, positive power signals or negative power signals through the first input end IN1 and the second input end IN2, and outputs the rectification result through the first rectification output end and the second rectification output end after rectification, and can identify the input positive signals and negative signals.

[0046] The signal inputted by the first input terminal IN1 and the signal inputted by the second input terminal IN2 are respectively from the circuit which has data interaction with the load control circuit.

[0047] In addition, the first input terminal and the second input terminal are used to connect the load element outside the load control circuit in parallel, as shown in FIG. 2, the first input terminal IN1 and the second input terminal IN2 are respectively connected to the two ends of the load element (which can be a resistor), IN1 and IN2 can supply power to the load element or receive signal modulation, in short, a voltage difference is allowed to be loaded on the two ends of the load element, which can be positive or negative. The signal inputted by the first input terminal and the signal inputted by the second input terminal are both externally inputted signals, wherein when the rectifier bridge circuit rectifies the externally inputted signals, there is a voltage difference between the signal inputted by the first input terminal and the signal inputted by the second input terminal, and the rectification result is outputted by the first rectification output terminal and the second rectification output terminal after the rectification processing of the rectifier bridge circuit, so that the voltage polarity can be determined and the input signal can be detected.

[0048] Specifically, as shown in the rectifier bridge circuit of FIG. 1, when the second level is inputted by the first input terminal IN1 and the first level is inputted by the second input terminal IN2, the second lower switch tube MP2 is turned on, the second upper switch tube MN2 is turned off, the first lower switch tube MP1 is turned off, and the first upper switch tube MN1 is turned on. The signal inputted by the first input terminal IN1 and the signal inputted by the second input terminal IN2 respectively exist in the circuit path of the first upper switch tube MN1 and the second lower switch tube MP2, then the signal inputted by the first input terminal IN1 is connected to the first rectification output terminal and outputted by the first rectification output terminal through the first upper switch tube MN1, which is equivalent to connecting the first input terminal IN1 to the modulation circuit and the energy control module; at the same time, the signal inputted by the second input terminal IN2 is connected to the second rectification output terminal and outputted by the second rectification output terminal through the second lower switch tube MP2, which is equivalent to connecting the second input terminal IN2 to the ground terminal; thereby the signal inputted by the first input terminal IN1 and the signal inputted by the second input terminal IN2 are rectified as the rectification result and outputted by the first rectification output terminal and the second rectification output terminal, so as to be recognized by the first controller; wherein the first upper switch tube MN1 and the second lower switch tube MP2 can be respectively connected to the corresponding sampling terminal of the first controller, or the corresponding circuit path exists and is connected to the corresponding sampling terminal of the first controller; the value of the second level is lower than or equal to 0, and the value of the first level is higher than 0.

[0049] When the first input end IN1 inputs a first level and the second input end IN2 inputs a second level, the second lower switch tube MP2 is off, the second upper switch tube MN2 is on, the first lower switch tube MP1 is on, the first upper switch tube MN1 is off, the signal input by the first input end IN1 and the signal input by the second input end IN2 respectively exist circuit paths in the first lower switch tube MP1 and the second upper switch tube MN2, then the signal input by the first input end IN1 is connected to the second rectification output end through the first lower switch tube MP1 and is output by the second rectification output end, which is equivalent to connecting the first input end IN1 to the ground end; the signal input by the second input end IN2 is connected to the first rectification output end through the second upper switch tube MN2 and is output by the first rectification output end, which is equivalent to connecting the second input end IN2 to the modulation circuit and the energy control module; thus the signals input by the second input end IN2 and the first input end IN1 (which can be regarded as signals opposite in polarity to the signals input by the first input end IN1 and the second input end IN2) are rectified into the rectification result and are output by the first rectification output end and the second rectification output end, so as to be recognized by the first controller; wherein the first lower switch tube MP1 and the second upper switch tube MN2 can be connected to corresponding sampling ends of the first controller respectively, or the corresponding existing circuit paths are connected to the corresponding sampling ends of the first controller; the value of the second level is lower than or equal to 0, and the value of the first level is higher than 0.

[0050] Thus in the charging or communication process of the load control circuit shown in Fig. 1 and the external circuit, the working voltage or current can be directly provided for the load element, and in the charging or communication process, the rectification bridge circuit is used to provide the rectified data interaction source and power supply for the load element.

[0051] Based on the foregoing embodiment, the application discloses a chip, the inside of which is provided with the load control circuit. As shown in FIG. 1, the pins of the chip are respectively provided as the first input end IN1, the first input end IN2, the ground end GND and the power supply end VCC, which are correspondingly connected to the rectifier bridge circuit and the energy control module in the chip. The specific circuit connection mode and the functional effect are referred to the foregoing embodiment. The chip can be divided into the modulation of the signals input to the first input end IN1 and the first input end IN2 and the charging of the external capacitor through the ground end GND and the power supply end VCC. The other pins of the chip are defined according to the actual requirements of the chip. Based on the load control circuit disclosed in the foregoing embodiment, the chip is internally integrated with the rectifier bridge circuit. The chip can identify the positive and negative signals generated by the positive and negative access of the external device (including the load element) to the first input end and the second input end. The chip can also stably supply power to the parallelly connected load element. The chip uses the modulation circuit to modulate so as to maintain normal data communication when the load element works. The chip stores and supplies power through the external capacitor to enhance the expandability and functional multiplicity of the peripheral components of the chip, thereby solving the problem of the increase of the number of peripheral components caused by the modulation and demodulation of data, reducing the manufacturing cost of the chip, and thus reducing the manufacturing cost of the product assembled with the chip.

[0052] The application also discloses a communication circuit, which comprises a first circuit and a second circuit. The first circuit comprises the chip or the load control circuit. Whether the chip or the load control circuit is used to connect the second circuit, the second circuit comprises a second controller, a power supply, a first switch tube and a second switch tube. The first circuit further comprises a load element and a capacitor. As shown in FIG. 2, the second circuit comprises a second controller MCU2, a power supply BAT, a first switch tube SW1 and a second switch tube SW2. The first switch tube SW1 and the second switch tube SW2 are controlled by the second controller MCU2. The first circuit further comprises a load element and a capacitor C. Preferably, the chip is an encryption chip, which at least encodes the data transmitted from the first circuit to the second circuit and can also decode the data transmitted from the second circuit to the first circuit.

[0053] In the load control circuit, the rectifier bridge circuit is provided with a first input end, a second input end, a first rectifier output end and a second rectifier output end. The energy control module is provided with a signal input end and a signal output end. The signal input end of the energy control module is connected to the first rectifier output end of the rectifier bridge circuit. The capacitor is connected in parallel to the signal output end of the energy control module and the second rectifier output end of the rectifier bridge circuit. The two ends of the load element are connected in parallel to the first input end and the second input end to accept the load modulation work. The capacitor is connected in parallel to the power supply end and the ground end to store electric energy.

[0054] The power supply is connected to the first input terminal through the first switch tube and the second switch tube respectively; the second controller is connected with the second input terminal, and data path is provided for the second controller to communicate with the first circuit, as shown in FIG. 2, the first switch tube SW1 is connected between the power supply VBAT and the first input terminal IN1 to form a switch path, and the second switch tube SW2 is connected between the power supply VBAT and the second input terminal IN2 to form another switch path; a signal path is connected between the second controller MCU2 and the second input terminal IN2. When the second circuit is configured as a host and the first circuit is configured as a slave, the first switch tube SW1 is used as a power switch, and the second switch tube SW2 is used for data interaction, i.e. responsible for the communication between the second circuit and the first circuit, so that the first switch tube SW1 and the second switch tube SW2 are turned on in different working modes respectively.

[0055] The second controller is configured to control the power supply to charge the first circuit by turning on the first switch tube and / or the second switch tube before the second controller communicates with the first circuit; specifically, the way of controlling the power supply to charge the first circuit by turning on the first switch tube and / or the second switch tube includes: controlling the power supply to charge the first circuit by turning on the first switch tube and the second switch tube in sequence, or controlling the power supply to charge the first circuit by turning on only the second switch tube, or controlling the power supply to charge the first circuit by turning on only the first switch tube. Wherein, the voltage across the capacitor of the first circuit when the first switch tube is turned on is higher than the voltage across the capacitor of the first circuit when the second switch tube is turned on.

[0056] Illustratively, before the second controller communicates with the first circuit, the second controller enters a charging mode, requests the second circuit to charge the first circuit, at least charges the capacitor in the first circuit, can first turn on the first switch tube, let the power supply charge the capacitor and control the conduction time of the first switch tube within a certain range to reduce the heating power of the load element, the conduction time of the first switch tube is preferably 2ms, to avoid overheating of the load element; then turn off the first switch tube, and then turn on the second switch tube to enter the communication mode, and continue to charge the capacitor in the first circuit by turning on the second switch tube. As shown in FIG. 2, when the second controller controls the first switch tube SW1 to be turned on but controls the second switch tube SW2 to be turned off, the voltage across the capacitor C of the first circuit when the first switch tube SW1 is turned on is the first charging voltage; when the second controller controls the first switch tube SW1 to be turned off but controls the second switch tube SW2 to be turned on, the voltage across the capacitor C of the first circuit when the second switch tube SW2 is turned on is the second charging voltage; since the equivalent internal resistance when the first switch tube SW1 is turned on is smaller than the equivalent internal resistance when the second switch tube SW2 is turned on, the first charging voltage is greater than the second charging voltage, which causes the working power of the load element when the first switch tube SW1 is turned on to be higher than the working power of the load element when the second switch tube SW2 is turned on; in order to prevent the heating power of the load element from being too large, the first switch tube SW1 is not allowed to be turned on for a long time, so it is necessary to switch to the second switch tube SW2 after the preset time of turning on, and the second switch tube SW2 is turned on for a long time to support capacitor charging and data interaction between the second circuit and the first circuit.

[0057] Alternatively, keep the first switch tube off and turn on the second switch tube to charge the capacitor to a voltage lower than or reaching a preset voltage by the power supply, and at the same time that the second switch tube is turned on, the charge pump provided in the energy control module raises the voltage output to the power supply end to charge the capacitor connected to the power supply end. The current in the branch where the second switch tube is located when it is turned on can be smaller than the current in the branch where the first switch tube is located when it is turned on.

[0058] Alternatively, turn on the first switch tube and turn off the second switch tube, at the same time, the charge pump provided in the energy control module does not need to raise the voltage, let the power supply charge the capacitor to a voltage reaching a preset voltage, then turn off the first switch tube and turn on the second switch tube to enter the communication mode, wherein the preset voltage is preferably 3V.

[0059] Alternatively, the first switch tube and the second switch tube are turned on at the same time, then the current output capability is enhanced in order to provide the load element with a rated working current; until the voltage across the capacitor of the first circuit reaches the preset voltage, the second controller receives the synchronization reset signal sent by the first circuit to determine that the charging of the first circuit is completed.

[0060] The second controller is configured to detect whether a synchronization reset signal sent by the first circuit is received when the power supply charges the first circuit, in which case the second switch is turned on, and the first switch can be turned on or turned off; and when the synchronization reset signal sent by the first circuit is detected, the second switch is kept on, and communication between the second controller and the first circuit is started, that is, the second controller sends data to the first circuit through the second input terminal IN2, waits for the first circuit to send response data to the second circuit after the data is sent, and then demodulates the modulated data sent by the first circuit through the first input terminal IN1 to form normal data interaction; when the second controller communicates with the first circuit, the capacitor has stored sufficient power supply power to keep supplying power to the load control circuit, and the subsequent charging mode can be re-entered to continue receiving the charging power of the second input terminal IN2 and the first input terminal IN1 to supplement the power consumed by the load control circuit.

[0061] In summary, the two switches are used to switch between charging the first circuit and communicating with the first circuit, which guarantees the heating of the parallelly connected load elements and the modulation and interaction of the external communication signal, and the load control circuit included in the first circuit has the identification effect of the input signal generated by the positive and negative connection of the external device and the modulation circuit, so as to maintain normal data communication during the operation of the load elements by simplifying the circuit design, and reduce the wire and stylus for the interaction between the host circuit and the slave circuit.

[0062] As an embodiment, the second circuit further includes a voltage dividing resistor connected in series between the second switch and the second input terminal, so as to facilitate voltage and current sampling; the power supply is connected to the first transmission terminal of the first switch, and the second transmission terminal of the first switch is connected to the first input terminal, so as to drive the power supply to charge the capacitor of the first circuit when the first switch is turned on; as shown in FIG. 2, the first switch SW1 is a PMOS tube, the second switch SW2 is also a PMOS tube, the first transmission terminal of the first switch SW1 is a source terminal connected to the power supply VBAT, and the second transmission terminal of the first switch SW1 is a drain terminal, the second switch SW2 is a PMOS tube, the second switch SW2 is also a PMOS tube, the first transmission terminal of the first switch SW1 is a source terminal connected to the power supply VBAT, and the second transmission terminal of the first switch SW1 is a drain terminal, the drain terminal of the first switch SW1 is connected to the first input terminal IN1, so that the on-off of the related switches in the rectifier bridge circuit drives the energy control module to charge the capacitor C.

[0063] The power supply is connected with the first transmission end of the second switch tube, the second transmission end of the second switch tube is connected with one end of the voltage dividing resistor, and the other end of the voltage dividing resistor is connected with the first input end, so as to reduce the power supply provided by the power supply for the load element of the first circuit when the second switch tube is turned on; preferably, an analog-to-digital converter is further connected between the voltage dividing resistor and the first input end to sample and convert the current flowing through the voltage dividing resistor, or sample and convert the voltage across the voltage dividing resistor. As shown in FIG. 2, the first transmission end of the second switch tube SW2 is the source end to access the power supply VBAT, the second transmission end of the second switch tube SW2 is the drain end, the second transmission end of the second switch tube SW2 is connected with one end of the voltage dividing resistor Rt, and the other end of the voltage dividing resistor Rt is connected with the first input end IN1, wherein the voltage dividing resistor Rt divides part of the voltage from the power supply, reduces the voltage input to the first input end IN1, and reduces the power of the load element connected in parallel to the first input end IN1 and the second input end IN2.

[0064] The second controller is configured to demodulate the to-be-identified signal according to the current change in the voltage dividing resistor after receiving the to-be-identified signal sent by the first circuit through the first input end and the second input end when the second switch tube is turned on; it should be noted that when the second switch tube is turned on, the first circuit sends the to-be-identified signal (a modulated signal modulated by the modulation circuit of the first circuit) to the second circuit through the second input end, at this time, the second controller demodulates the to-be-identified signal according to the current change in the voltage dividing resistor, as shown in FIG. 2, the second controller MCU2 can sample the current change flowing through the voltage dividing resistor Rt through the analog-to-digital converter, and then demodulate according to the current change flowing through the voltage dividing resistor Rt, and extract the demodulation result of the signal sent by the first circuit to identify whether the first circuit is in the charging mode or the communication mode, if it is in the charging mode, the corresponding charging voltage and charging current of the charging mode can be identified, and the power of the load element can be determined; if it is in the communication mode, the data frame in the to-be-identified signal can be parsed.

[0065] In summary, the second circuit disclosed in the present application switches the charging and data communication of the first circuit through two switch tubes, and a voltage dividing resistor is connected in series in the switch tube branch responsible for communication, so that the heat power of the parallel load element can be reduced on the basis of the hardware circuit of the data communication.

[0066] As an embodiment, the second controller is configured to control the power supply to charge the first circuit by sequentially turning on the first switch and the second switch before the second controller communicates with the first circuit. The method includes: the second controller is configured to control the first switch to be turned on for a preset time to charge the capacitor of the first circuit with the power supply. This method does not require a dedicated boost circuit, and directly stores the power supply into the capacitor. However, the turn-on time of the first switch is shorter than the turn-on time of the second switch. The preset time is generally controlled within 2 ms. Then, the first switch is turned off. At this time, the voltage across the capacitor can be lower than the preset voltage, thereby avoiding overheating of the load element. At the same time, the second switch is turned on. As shown in FIG. 2, after the second switch SW2 is turned on, the power supply VBAT charges the capacitor C of the first circuit by replacing the branch in which the first switch SW1 is located. Until the voltage across the capacitor C reaches the preset voltage, the modulation circuit can be maintained to perform data modulation, and it can be determined that the capacitor charging of the first circuit is completed. In addition, when the voltage across the capacitor reaches the preset voltage during the turn-on of the first switch, it is determined that the capacitor charging of the first circuit is completed. Then, the second switch is turned on to start the communication between the second circuit and the first circuit.

[0067] In the embodiment, when the voltage across the capacitor reaches the preset voltage after the second switch SW2 is turned on, the first controller sends a synchronization reset signal to the second circuit through the first input terminal and the second input terminal. The synchronization reset signal can be regarded as a plurality of equally spaced high and low levels, which are used as the frame header of the data frame. The second controller is configured to turn on the second switch. In the case where the second switch is turned on, the synchronization reset signal sent by the first circuit is received. It is determined that the second circuit completes the charging of the first circuit. Thus, the first controller recognizes the charging voltage and the charging current corresponding to the charging mode, and provides sufficient power support for the modulation work of the modulation circuit in the first circuit and the data interaction work between the first controller and the second controller.

[0068] As an embodiment, the second controller is configured to control the power supply to charge the first circuit by turning on the second switch. The method includes: the second controller is configured to control the first switch to be turned off and turn on the second switch to charge the capacitor of the first circuit with the power supply. Until the voltage across the capacitor reaches the preset voltage, the synchronization reset signal sent by the first circuit is received, and it is determined that the charging of the first circuit is completed. In the process of turning on the second switch to charge the capacitor of the first circuit with the power supply, the voltage input by the first input terminal is rectified by the rectifier bridge circuit and is adjusted by the energy control module. The voltage output by the energy control module to the power supply is higher than the voltage input by the first input terminal. The voltage output by the energy control module to the power supply drives the modulation circuit to perform the modulation work.

[0069] As shown in Fig. 2, when the second switch SW2 is turned on, the voltage inputted at the first input IN1 is 1.5V after the power supply is divided by the voltage dividing resistor Rt, and the voltage outputted by the energy control module to the power supply terminal VCC reaches 3V after rectification by the rectifier bridge circuit and voltage boost by the energy control module, so as to drive the modulation circuit to modulate data in cooperation with the rectifier bridge circuit, and obtain the modulation signal to be sent to the second circuit.

[0070] It is worth noting that the energy control module is internally provided with a charge pump for boosting the input voltage and maintaining the voltage by an externally connected capacitor. The capacitor maintains a direct current and does not participate in modulation coding, so that the modulation circuit can work normally, i.e. a smaller current can be used to modulate data by controlling the current of the control circuit through the on and off of the switch unit. The charge pump boosts the voltage to charge the capacitor.

[0071] As an embodiment, the second controller is configured to control the method for charging the first circuit by the power supply by turning on only the first switch, which includes: the second controller is configured to control the second switch to keep off and turn on the first switch to charge the capacitor of the first circuit by the power supply, at this time, the data interaction with the first circuit through the second input can be stopped until the voltage across the capacitor reaches the preset voltage, then the second switch is turned on and the first switch is turned off, and the synchronous reset signal sent by the first circuit is received to determine that the charging of the first circuit is completed. In the process of turning on the first switch to charge the capacitor of the first circuit by the power supply, the signal inputted at the first input is rectified by the rectifier bridge circuit, and the circuit path between the modulation circuit, the rectifier bridge circuit and the capacitor is gated by the energy control module, so that the signal inputted at the first input is directly outputted to the power supply terminal after rectification by the rectifier bridge circuit without voltage adjustment by the energy control module.

[0072] As shown in Fig. 2, when the first switch SW1 is turned on, the voltage inputted at the first input IN1 can be 3V without voltage division by the resistor, and the voltage outputted by the energy control module to the power supply terminal VCC reaches 3V after rectification by the rectifier bridge circuit, so as to drive the modulation circuit to modulate data in cooperation with the rectifier bridge circuit, and obtain the modulation signal to be sent to the second circuit.

[0073] The application further discloses an interaction control method, and the execution subject of the interaction control method is the second controller in the communication circuit. As shown in Fig. 3, the interaction control method includes:

[0074] Step 11, the second controller controls the power supply to charge the first circuit by turning on the first switch tube and / or the second switch tube; then step 12 is executed; specifically, when step 11 is executed, the second controller can control the power supply to charge the first circuit by turning on the first switch tube and the second switch tube in sequence, or by turning on only the second switch tube, or by turning on only the first switch tube, or by turning on the second switch tube and the first switch tube at the same time; then step 12 is executed. Wherein, the turning on and turning off of the second switch tube causes the current flowing through the voltage dividing resistor Rt to change in size, and the second controller demodulates based on this to extract the demodulation result of the signal sent from the first circuit.

[0075] Based on the foregoing circuit-related embodiments, when the first switch tube is turned on only to control the power supply to charge the first circuit, the first circuit does not need to perform voltage boosting on the rectified signal inside it; and when the second switch tube is turned on only to control the power supply to charge the first circuit, the first circuit needs to perform voltage boosting on the rectified signal inside it.

[0076] Step 12, detect whether the synchronization reset signal sent by the first circuit is received, if yes, execute step 13, otherwise, end the execution of the interactive control method, that is, stop the data interaction between the second circuit and the first circuit; during the execution of step 12, the second controller keeps the second switch tube and / or the first switch tube turned on, and the second controller can still control the second switch tube and / or the first switch tube to be turned on to make the power supply charge the first circuit, while the second controller detects whether the synchronization reset signal sent by the first circuit is received; when the voltage across the capacitor reaches the preset voltage, the modulation circuit can perform data modulation, and the first controller starts to send the synchronization reset signal to the second circuit; when the second controller detects that the synchronization reset signal sent by the first circuit is received, step 13 is executed.

[0077] Step 13, the second controller sends a first data packet to the first circuit, and after the sending is completed, step 14 is executed; in step 13, the second controller sends a first data packet to the first circuit based on the synchronization reset signal, wherein the first data packet can be a data packet that needs to be encrypted by the first controller in the first circuit, a voltage and current configuration data packet, etc. The first data packet can be a single frame data packet, and the bit width is 32 bits.

[0078] Then the first circuit receives the first one data packet, rectifies through the rectifier bridge circuit, the current flowing through the rectifier bridge circuit is fed back to the current limiting resistor, triggering the first controller to demodulate according to the current change in the current limiting resistor, while the energy control module and the capacitor maintain the power of the modulation circuit and the first controller, and the demodulation result is recognized by the first controller; then based on the demodulation result, the first controller sends the second circuit the first two data packets, which are data packets made by the modulation circuit by controlling the on and off of the internal switching unit, and can include power request information or encrypted data packets. Under the control of the first controller, the rectifier bridge circuit causes current change during the on and off of the switching unit, causing the current of the load element to change, so that the modulation circuit is controlled by the first controller to implement the modulation operation.

[0079] Step 14, the second controller receives the first two data packets sent by the first circuit, and after receiving, step 15 is executed; in order to verify the accuracy of data communication between the second circuit and the first circuit, the first two data packets are obtained by the first controller controlling the modulation circuit to modulate the demodulation result. The bit width of the first two data packets is equal to that of the first one data packet, and the type of the constituent data bit of the first two data packets is the same as that of the first one data packet.

[0080] Step 15, judge whether the first two data packets are the same as the first one data packet, if yes, execute step 13, otherwise end the execution of the interactive control method. In step 15, whether the first two data packets are the same as the first one data packet is judged, which can be known from figure 2, specifically including: the second controller MCU2 detects the voltage across the voltage dividing resistor Rt and calculates the current in real time, obtains the current change across the voltage dividing resistor Rt, completes the demodulation of the first two data packets, obtains the data to be verified, if the first two data packets include encrypted data in advance, the data still needs to be decrypted through the key; then the second controller MCU2 performs exclusive or operation on the data to be verified and the preset data, and then compares the data after the exclusive or operation with the original data, if they are consistent, it is determined that the first two data packets are the same as the first one data packet, the communication circuit continues to work, and a new first one data packet is generated by the second circuit, then in step 13 the second controller sends the new first one data packet to the first circuit, so that the first circuit receives the new first one data packet.

[0081] If the data after the XOR operation is inconsistent with the original data, it indicates that the data exchanged between the second circuit and the first circuit is abnormal, and the communication circuit stops working. In another embodiment, if the data after the XOR operation is inconsistent with the original data, the first two data packets are demodulated again to obtain the to-be-verified data again; after re-judgment for two or more times, if they are still not equal, the data exchanged between the second circuit and the first circuit is abnormal, and the communication circuit stops working. The original data is the data required to be modulated by the second controller in step 13, and the modulation result is the first one data packet.

[0082] In some embodiments, for the first one data packet sent in step 13, the second controller generates a 32-bit random code and combines it with the first preset data to obtain original data of multiple bits, then performs AES encryption by a 32-bit key, and then modulates the first one data packet by the modulation circuit. The AES encryption refers to the Advanced Encryption Standard (AES), which is a common symmetric encryption algorithm, that is, the same key is used for encryption and decryption.

[0083] From the foregoing steps 11 to 15, it can be seen that the controller (second controller) on the second circuit side is the main body of execution, the conduction and disconnection of the second switch tube, the conduction and disconnection of the switching unit on the first circuit side, and the data interaction between the second circuit and the first circuit are dominated by the synchronization reset signal; and based on the difference between the data packets exchanged between the second circuit and the first circuit, it is verified whether the communication circuit is working normally to control the second circuit to continuously send data packets to the first circuit, maintain the data communication operation between the second circuit and the first circuit, and stop the data communication operation between the second circuit and the first circuit in the case that the synchronization reset signal is not received and the data packets exchanged between the second circuit and the first circuit are not the same.

[0084] In the above embodiment, before the first circuit sends the synchronization reset signal to the second circuit in step 12 or before the first circuit sends the first two data packets to the second circuit in step 14, the first controller controls the current of the first circuit through the modulation circuit, specifically controls the conduction and closing (disconnection, the current in the modulation circuit decreases) of the switching unit arranged in the modulation circuit, so that the current in the modulation circuit constantly changes between large current and small current, to modulate the data packet required to be sent, and then the first controller sends the modulated data packet to the first circuit.

[0085] The synchronization reset signal is the frame header data in a single frame data packet, which is used to indicate the start of a frame data packet communication between the second circuit and the first circuit.

[0086] After the second controller receives the synchronization reset signal sent by the first circuit in step 12 or receives the first two data packets sent by the first circuit in step 14, the second controller demodulates according to the change of the current in the voltage dividing resistor connected in series with the second switch tube. In the demodulation process, the second controller records the change rule of the current in the voltage dividing resistor, restores the data modulated into the first one data packet, extracts each bit of data, and achieves the purpose of communication. Further, by comparing the original data required for modulating the first one data packet sent in step 13 with the demodulated result of the first two data packets received in step 14, the data interaction verification of the communication circuit is completed, and the legitimacy of the first controller and the second controller is determined respectively.

[0087] As the modulation and demodulation operations corresponding to the sending of the first one data packet by the second circuit to the first circuit and the receiving of the first two data packets sent by the first circuit by the second circuit cannot be separated from the turn-on and turn-off of the second switch tube, and the turn-on and turn-off of the second switch tube and the voltage dividing effect of the resistor connected in series with the second switch tube will cause the change of the current in the circuit, the interactive control method implemented by the present application can overcome the problem of difficult communication of the chip under large current in the circuit design at low cost. For example, during the heating work process of the load element of the first circuit, the working current in the circuit is a large current of 3A. Under such a large current, the energy released by the system is large, and any fluctuation will cause signal interference. If data interaction is directly performed through the data line under a large current, the influence is large, and it is difficult to implement. Therefore, the second circuit turns on and off the second switch tube (assuming that when the second switch tube is turned off, the current in the circuit decreases to 100mA), so that the current in the circuit constantly changes between large current and small current. Based on this, the second controller records the change rule of the current in the circuit, thereby restoring the data and achieving the purpose of communication.

[0088] The present application also discloses an interactive control method, and the execution subject of the interactive control method is the first controller in the communication circuit; as shown in FIG. 4, the interactive control method comprises:

[0089] After the second controller controls the power supply to charge the first circuit by turning on the second switch tube and / or the first switch tube, the second controller keeps the second switch tube and / or the first switch tube turned on, that is, the second controller can control the power supply to charge the first circuit by turning on the first switch tube and the second switch tube in turn, or by turning on only the second switch tube, or by turning on only the first switch tube, or by turning on the second switch tube and the first switch tube at the same time. The interactive control method executed in this case comprises:

[0090] Step 21, the first controller detects whether the synchronization reset signal sent by the second circuit is received, if yes, step 22 is executed, otherwise, the interactive control method is ended; during the execution of step 21, the second controller can still control the second switch tube to be turned on to enable the power supply to charge the first circuit, while the first controller detects whether the synchronization reset signal sent by the second circuit is received; when the voltage across the capacitor reaches the preset voltage, the second controller starts to send the synchronization reset signal to the first circuit through the second input terminal; when the first controller detects that the synchronization reset signal sent by the second circuit is received, step 22 is executed.

[0091] Step 22, the first controller sends a second data packet to the second circuit, and after the sending is completed, step 23 is executed; in step 22, the first controller sends a second data packet to the second circuit based on the synchronization reset signal, wherein the second data packet can be a data packet that needs to be encrypted by the first controller in the first circuit, a voltage and current configuration data packet, etc. The second data packet can be a single frame data packet, and the bit width thereof is 32 bits.

[0092] Step 23, the first controller receives a second data packet sent by the second circuit, and after the receiving is completed, step 24 is executed; after the second circuit receives the second data packet, the second data packet is demodulated according to the current change in the voltage dividing resistor connected with the first input terminal, and the demodulation result is recognized by the second controller; then, based on the demodulation result, the second controller sends a second data packet to the first circuit, and the second data packet can include power request information or an encrypted data packet. The bit width of the second data packet is equal to that of the second data packet, and the types of the composed data bits of the second data packet and the second data packet are the same.

[0093] Step 24, judging whether the second two data packet and the second one data packet are same, yes, executing step 22, no, ending the interactive control method. In the step 24, the judging method of whether the second two data packet and the second one data packet are same, combining with figure 2, specifically includes: the first controller MCU1 real-time detects the voltage of the current limiting resistor Rs or the voltage of the first input end and calculates the current, obtains the current change of the current limiting resistor Rs or the load element, completes the demodulation of the second two data packet, obtains the data to be verified, if the second two data packet pre-includes encrypted data, still needs to be decrypted by the key; then the first controller MCU1 carries out exclusive or operation between the data to be verified and the preset data, then compares the data after exclusive or operation with the original data, if the two are consistent, it is determined that the second two data packet and the second one data packet are same, the communication circuit continues to work, and the first circuit generates a new second one data packet, then in step 22, the first controller sends the new second one data packet to the second circuit, so that the second circuit receives the new second one data packet.

[0094] If the data after exclusive or operation and the original data are not consistent, it means that the data of the interaction between the second circuit and the first circuit is abnormal, and the communication circuit stops working. In another embodiment, if the data after exclusive or operation and the original data are not consistent, the second two data packet is demodulated again, and the data to be verified is obtained again; after re-determining two or more times, if they are still not equal, the data of the interaction between the second circuit and the first circuit is abnormal, and the communication circuit stops working. Wherein, the original data is the data required to be modulated by the first controller in step 22, and the modulation result is the second one data packet.

[0095] In some embodiments, for the second one data packet sent in step 22, the first controller generates a 32-bit random code and combines it with the first preset data to obtain multi-bit original data, then performs AES encryption by a 32-bit key, and then modulates the second one data packet by the modulation circuit. Wherein, the AES encryption refers to the advanced encryption standard (Advanced Encryption Standard, AES), which is a common symmetric encryption algorithm, that is, the same key is used for encryption and decryption.

[0096] According to the above steps 21 to 24, the controller (first controller) on the first circuit side is the main body of execution, and the data interaction between the first circuit and the second circuit is dominated by controlling the on and off of the switch unit to modulate the load; and based on the difference between the data packets exchanged between the second circuit and the first circuit, it is verified whether the communication circuit is working normally to control the first circuit to continuously send data packets to the second circuit, maintain the data communication operation between the first circuit and the second circuit, and also stop the data communication operation between the first circuit and the second circuit in the case that no synchronization reset signal is received and the data packets exchanged between the first circuit and the second circuit are not the same.

[0097] On the basis of the above embodiment, before the second circuit sends the synchronization reset signal to the first circuit in step 21 or before the second circuit sends the second data packet to the first circuit in step 23, the second controller modulates the required data packet, that is, the second data packet is automatically modulated by the second controller.

[0098] After the first controller receives the synchronization reset signal sent by the second circuit in step 21 or receives the second data packet sent by the second circuit in step 23, the first controller demodulates according to the current change in the rectifier bridge circuit or the load element; in the demodulation process, the first controller records the current change in the rectifier bridge circuit or the load element, restores the data modulated into the second data packet, extracts each bit of data, and achieves the purpose of communication. Further, by comparing the original data required to modulate the second data packet sent in step 22 with the demodulated result of the second data packet received in step 23, the data interaction verification of the communication circuit is completed, and the legitimacy of the first controller and the second controller is determined respectively.

[0099] In summary, since the modulation and demodulation operations involved in the sending of the second data packet by the second circuit to the first circuit and the receiving of the second data packet sent by the first circuit by the second circuit both cannot be implemented without the on and off of the switch unit, and the on and off of the switch unit and the voltage division of the current-limiting resistor will cause the current in the rectifier bridge circuit and the load element to change, the interactive control method implemented by the application can overcome the problem of difficulty in communication of the chip under a large current in a low-cost circuit design. For example, during the heating process of the load element of the first circuit, the working current in the circuit is a large current of 3A. Under such a large current, the system releases a large amount of energy, and any fluctuation will cause signal interference. If data interaction is directly performed through the data line under a large current, the influence is large, and it is difficult to implement. Therefore, the first circuit causes the current in the modulation circuit to constantly change between a large current and a small current by the on and off of the switch unit provided in the modulation circuit (when off, the current in the modulation circuit decreases), thereby playing a role in modulating data. Based on this, the first controller can also restore the data by recording the change rule of the current in the circuit, thereby achieving the purpose of communication.

[0100] In some embodiments, the second controller or the first controller converts and sequentially identifies the value of each data bit in the data packet as a combination sequence of a first level of a first preset time length and a second level of a second preset time length, the first level being a low level and the second level being a high level. When the switch unit provided in the modulation circuit is turned on, a high level is output, and the time when the switch unit is turned on is the time length during which the high level lasts. When the switch unit provided in the modulation circuit is turned off, a low level is output, and the time when the switch unit is turned off is the time length during which the low level lasts. Then, the modulation circuit turns off for the first preset time length and turns on for the second preset time length in succession to obtain the combination sequence of the first level of the first preset time length and the second level of the second preset time length, so as to represent one data bit.

[0101] For the data packet of the corresponding byte, the first controller or the second controller sequentially converts the values of a plurality of data bits into low levels and high levels of corresponding time lengths, and the hardware circuit basis for the conversion is a switch tube or other switch unit to switch between high levels and low levels. The duration of the high level or the duration of the low level is obtained by counting by a counter. Specifically, the counter counts the number of data bits that have been transmitted by recording the interruption of the first input end or the second input end. It can be understood that, if the count value of the low level width between the continuous two rising edges of the to-be-identified bit data received by the first controller or the second controller from the first input end and the second input end within a predetermined bit period is greater than the count value of the high level width, it is determined that the first preset time length is greater than the second preset time length, and it is determined that the to-be-identified bit data received is “1”, and vice versa.

[0102] The signal waveform transmitted by the first input end or the second input end is shown in Fig. 5. In the waveform diagram shown in Fig. 5, when the first preset time length is equal to the second preset time length, the first level of the first preset time length and the second level of the second preset time length form equal-interval high and low levels, i.e., two continuous high and low levels of equal time length, indicating a data bit value of "0", and dT is preferably 10 uS. After charging is completed, the transmitted synchronization reset signal is composed of four continuous synchronization pulse signals, each of which is composed of the first level of the first preset time length and the second level of the second preset time length, i.e., one synchronization reset signal uses four data bits of "0". Therefore, the modulation circuit obtains a data bit of "0" by controlling the internal switch unit to be disconnected for the first preset time length and then turned on for the second preset time length. The synchronization reset signal is modulated by controlling the switch unit to be disconnected for the first preset time length and then turned on for the second preset time length four times in succession, which is regarded as continuously obtaining four data bits of "0".

[0103] The first circuit can regard the synchronization reset signal as four data bits of "0" of continuous four bit periods. After the first circuit sends the synchronization reset signal to the second circuit, the synchronization reset signal is regarded as a communication start signal of the second circuit, prompting the second circuit to send other data bits to the first circuit.

[0104] In the waveform diagram shown in Fig. 5, when the first preset time length is equal to twice the second preset time length, the signal sequence composed of the first level of the first preset time length and the second level of the second preset time length indicates a data bit value of "1". Therefore, after a long continuous high level used for indicating a charging signal and the aforementioned synchronization reset signal are sequentially sent, two data bits of "1" and "0" are sequentially sent. The number and time length of the synchronization pulse signals included in the aforementioned synchronization reset signal, the time length of the continuous high level used for indicating a charging signal, the first preset time length and the second preset time length are all recorded by a counter. The counter can know the number of received data bits by counting the number of received data bits.

[0105] It should be noted that the number of data bits is determined by the number of bytes of a data packet. The data bits include check bits, address bits and content bits. For example, a 2-byte data group includes 16 data bits, of which 4 bits are check bits, 4 bits are address bits and 8 bits are content bits. The number of data bits occupied by each part can be set according to the number of bytes and specific requirements. Each device has one or several independent receiving addresses or sending addresses, and the sending address and the receiving address can be the same or different.

[0106] The terms "first", "second", "third", etc. are used only for the purpose of description, and are not to be interpreted as indicating or implying relative importance or a number of indicated technical features. Thus, features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0107] Although the embodiments of the present application have been shown and described above, it is to be understood that the above-described embodiments are exemplary only, and are not to be interpreted as limiting the present application, and ordinary skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A load control circuit, characterized by, The rectifier bridge circuit, the modulation circuit, the energy control module and the first controller are included. The rectifier bridge circuit is connected with the modulation circuit, and the rectifier bridge circuit is connected with the energy control module. The rectifier bridge circuit is used for rectifying input signals and outputting rectification results. The first controller is used for causing current changes in the rectifier bridge circuit by controlling the modulation circuit, and driving current changes in the load element to perform modulation. The energy control module is used for charging the capacitor connected with the load control circuit by the rectification results, and selecting the capacitor connected with the load control circuit to supply power to the modulation circuit.

2. The load control circuit of claim 1, wherein, The modulation circuit includes a current-limiting resistor and a switching unit. One end of the switching unit is connected with the first rectification output end, the other end of the switching unit is connected with one end of the current-limiting resistor, and the other end of the current-limiting resistor is connected with the second rectification output end. The modulation circuit is used for causing current changes in the rectifier bridge circuit when the switching unit changes from conduction to non-conduction or the switching unit changes from non-conduction to conduction, and driving current changes in the load element to perform modulation. The conduction and non-conduction of the switching unit are controlled by the first controller.

3. The load control circuit of claim 2, wherein, The load control circuit is provided with a power supply end and a grounding end.

4. The load control circuit of claim 3, wherein, The capacitor connected with the load control circuit is connected in parallel to the power supply end and the grounding end to store power supply capacity by the capacitor. The energy control module is internally integrated with a charge pump. The signal input end of the charge pump is connected with the first rectification output end of the rectifier bridge circuit, and the signal output end of the charge pump is connected with the power supply end. The charge pump is used for boosting the rectification results, and outputting the boosted results to the capacitor connected with the load control circuit, or used for outputting the rectification results to the capacitor connected with the load control circuit without adjustment, so as to charge the capacitor connected with the load control circuit.

5. The load control circuit of claim 3, wherein, The charge pump is also used for selecting a circuit path between the capacitor connected with the load control circuit and the modulation circuit, so that the capacitor connected with the load control circuit maintains a preset voltage to supply power to the modulation circuit when the capacitor is charged to the preset voltage. The signal input end of the charge pump is the signal input end of the energy control module, and the signal output end of the charge pump is the signal output end of the energy control module. The energy control module is internally integrated with a switching network. The signal input end of the switching network is connected with the first rectification output end of the rectifier bridge circuit, and the signal output end of the switching network is connected with the power supply end, so as to select a circuit path between the modulation circuit, the rectifier bridge circuit and the capacitor connected with the load control circuit. A switch network is used to switch between power supply and power cut-off of the capacitor connected to the load control circuit, to drive current change in the modulation circuit and the rectifier bridge circuit, to make the rectification result charge the capacitor connected to the load control circuit, and to supply power to the modulation circuit when the capacitor is charged to a preset voltage; The signal input end of the switch network is the signal input end of the energy control module; and the signal output end of the switch network is the signal output end of the energy control module.

6. The load control circuit of claim 2, wherein, The rectifier bridge circuit comprises a first upper switch tube, a second upper switch tube, a first lower switch tube and a second lower switch tube. The first transmission end of the first upper switch tube and the first transmission end of the second upper switch tube are commonly connected to the energy control module. The control end of the first upper switch tube is connected to the control end of the first lower switch tube, and the second transmission end of the first upper switch tube is connected to the second transmission end of the first lower switch tube. The control end of the second upper switch tube is connected to the control end of the second lower switch tube, and the second transmission end of the second upper switch tube is connected to the second transmission end of the second lower switch tube. The control end of the first lower switch tube is connected to the second transmission end of the second lower switch tube. The control end of the second lower switch tube is connected to the second transmission end of the first lower switch tube. The first transmission end of the second lower switch tube is connected to the first transmission end of the first lower switch tube. The first transmission end of the first upper switch tube and the first transmission end of the second upper switch tube are commonly connected to the first rectification output end, and the first transmission end of the second lower switch tube and the first transmission end of the first lower switch tube are commonly connected to the second rectification output end.

7. The load control circuit of claim 6, wherein, The load control circuit is provided with a first input end and a second input end, the second transmission end of the first upper switch tube and the second transmission end of the first lower switch tube are connected to the first input end, and the second transmission end of the second upper switch tube and the second transmission end of the second lower switch tube are connected to the second input end. The input signal port of the rectifier bridge circuit comprises a first input end and a second input end, and the first input end and the second input end are used to connect the load element outside the load control circuit in parallel; The signal input by the first input end and the signal input by the second input end are both external input signals, and there is a voltage difference between the signal input by the first input end and the signal input by the second input end when the rectifier bridge circuit rectifies the external input signals.

8. A chip, characterized by The chip is internally provided with the load control circuit of any one of claims 1 to 7.

9. A communications circuit, characterized by The chip comprises a first circuit and a second circuit. The first circuit comprises the chip of claim 8 or the load control circuit of any one of claims 1 to 7, the second circuit comprises a second controller, a power supply, a first switch tube and a second switch tube, the first circuit further comprises a load element and a capacitor, and in the load control circuit, the rectifier bridge circuit is provided with a first input end, a second input end, a first rectification output end and a second rectification output end, the energy control module is provided with a signal input end and a signal output end, the signal input end of the energy control module is connected to the first rectification output end of the rectifier bridge circuit, the capacitor is connected in parallel to the signal output end of the energy control module and the second rectification output end of the rectifier bridge circuit, and the load element is connected in parallel to the first input end and the second input end. The power supply is connected to the first input terminal through the first switch tube and the second switch tube respectively; the second controller is connected to the second input terminal, and provides a data path for the second controller to communicate with the first circuit; The second controller controls the power supply to charge the first circuit by turning on the first switch tube and / or the second switch tube before the second controller communicates with the first circuit; The second controller detects whether a synchronization reset signal sent by the first circuit is received when the power supply charges the first circuit, and keeps the second switch tube on and starts to communicate with the first circuit when the synchronization reset signal sent by the first circuit is detected; when the second controller communicates with the first circuit, the capacitor supplies power to the load control circuit.

10. The communication circuit of claim 9, wherein, The second circuit further comprises a voltage dividing resistor; The power supply is connected to the first transmission end of the first switch tube, and the second transmission end of the first switch tube is connected to the first input terminal, so that the power supply charges the capacitor of the first circuit when the first switch tube is turned on; The power supply is connected to the first transmission end of the second switch tube, and the second transmission end of the second switch tube is connected to one end of the voltage dividing resistor, and the other end of the voltage dividing resistor is connected to the first input terminal, so that the power supply reduces the power supply to the load element of the first circuit when the second switch tube is turned on.

11. The communication circuit of claim 10, wherein, The method of controlling the power supply to charge the first circuit by turning on the first switch tube and / or the second switch tube comprises: controlling the power supply to charge the first circuit by turning on the first switch tube and the second switch tube in sequence, or controlling the power supply to charge the first circuit by turning on only the second switch tube, or controlling the power supply to charge the first circuit by turning on only the first switch tube; The voltage across the capacitor of the first circuit when the first switch tube is turned on is higher than the voltage across the capacitor when the second switch tube is turned on.

12. The communication circuit of claim 11, wherein, The method of controlling the power supply to charge the first circuit by turning on the first switch tube and the second switch tube in sequence by the second controller comprises: The second controller controls the first switch tube to be turned on for a preset time, and then turns off the first switch tube while turning on the second switch tube, and determines that the charging of the first circuit is completed when the voltage across the capacitor reaches a preset voltage.

13. The communication circuit of claim 11, wherein, The method of controlling the power supply to charge the first circuit by turning on only the second switch tube by the second controller comprises: The second controller controls the first switch tube to be kept off and controls the second switch tube to be turned on to charge the capacitor of the first circuit, and determines that the charging of the first circuit is completed when the voltage across the capacitor reaches a preset voltage; wherein the voltage input from the first input terminal is rectified by the rectifier bridge circuit and is adjusted by the energy control module, so that the voltage output from the energy control module to the power supply end is higher than the voltage input from the first input terminal, and the voltage output from the energy control module to the power supply end drives the modulation circuit to work in modulation.

14. The communication circuit of claim 11, wherein, The second controller is configured to control the power supply to charge the first circuit by turning on only the first switch tube. The second controller is configured to control the second switch tube to remain off and the first switch tube to be turned on to charge the capacitor of the first circuit by the power supply until the voltage across the capacitor reaches a preset voltage, and then determine that the charging of the first circuit is completed.

15. An interactive control method, characterized by, The second controller in the communication circuit according to any one of claims 9 to 14 is the execution subject of the interactive control method. The interactive control method comprises: Step 11, the second controller controls the power supply to charge the first circuit by turning on the first switch tube and / or the second switch tube, and then executes step 12. Step 12, it is detected whether the synchronization reset signal sent by the first circuit is received, if yes, step 13 is executed, otherwise the interactive control method is ended. Step 13, the second controller sends the first one data packet to the first circuit, and then executes step 14 after the sending is completed. Step 14, the second controller receives the first two data packet sent by the first circuit, and then executes step 15 after the receiving is completed. Step 15, it is judged whether the first two data packet is same as the first one data packet, if yes, step 13 is executed, otherwise the interactive control method is ended.

16. The interactive control method of claim 15, wherein, Before the first circuit sends the synchronization reset signal to the second circuit in step 12 or before the first circuit sends the first two data packet to the second circuit in step 14, the first controller controls the current in the load element by the modulation circuit to modulate the required data packet. After the second controller receives the synchronization reset signal sent by the first circuit in step 12 or after the second controller receives the first two data packet sent by the first circuit in step 14, the second controller demodulates according to the current change in the voltage dividing resistor connected in series with the second switch tube.

17. An interactive control method, characterized by, The first controller in the communication circuit according to any one of claims 9 to 14 is the execution subject of the interactive control method. After the second controller controls the power supply to charge the first circuit by turning on the second switch tube and / or the first switch tube, the interactive control method comprises: Step 21, the first controller detects whether the synchronization reset signal sent by the second circuit is received, if yes, step 22 is executed, otherwise the interactive control method is ended. Step 22, the first controller sends the second one data packet to the second circuit, and then executes step 23 after the sending is completed. Step 23, the first controller receives the second two data packet sent by the second circuit, and then executes step 24 after the receiving is completed. Step 24, it is judged whether the second two data packet is same as the second one data packet, if yes, step 22 is executed, otherwise the interactive control method is ended.

18. The interactive control method of claim 17, wherein, The second controller modulates the data packet to be sent before the second circuit sends the synchronization reset signal to the first circuit in step 21 or before the second circuit sends the second data packet to the first circuit in step 23; The first controller demodulates according to the current change in the rectifier bridge circuit or the load element after the first controller receives the synchronization reset signal sent by the second circuit in step 21 or after the first controller receives the second data packet sent by the second circuit in step 23.

Images