Control switch circuit

Abstract

The utility model discloses a control switch circuit, which is arranged between a power supply module and an electric power communication module, and comprises a PLC (Programmable Logic Controller) Module chip and an AC-DC (Alternating Current-Direct Current) Module module which are respectively connected with the power supply module, an MOS (Metal Oxide Semiconductor) tube Q1 connected with the PLC Module chip, and a triode Q2 connected with the MOS tube Q1, and the PLC Module chip and the electric power communication module adopt RX pin and TX pin serial port bidirectional interaction. By adopting the structure, when the power communication module is subjected to external electromagnetic interference (such as surge, pulse train, harmonic wave and the like from a power grid), the power communication module works abnormally, the communication between the power communication module and the external application system module is abnormal, and after the VDD of the power communication module is restarted and discharged, the communication function of the power communication module can be recovered to be normal; however, for a terminal application client, the signal of the power communication module is interrupted, the panel needs to be automatically restarted and recovered, and the function can be recovered without manually plugging and unplugging the power supply of the whole 86 box intelligent communication control switch.

Description

Technical Field

[0001] The utility model relates to a control switch circuit, which is applied to a high-precision 86 intelligent temperature control panel with a power line communication function and an intelligent control panel with a control switch circuit. It has high temperature control accuracy and communication self-starting function to ensure stable and reliable communication of the product. Background Art

[0002] With the increasing popularity and application of the concept of smart home, smart home products have developed from the early single-product intelligence to today's whole-house intelligence. The market has put forward the demand for interconnection between devices. In order to achieve interconnection between devices, the network wiring between electrical appliances has become more and more complicated and the cost has become higher and higher.

[0003] In order to realize the interconnection between various smart home devices, power communication (PLC, Power Line Communication) technology has been greatly developed. Among them, the 86-box smart control panel with power communication function, as the control center of various smart home products, is easy to install with its standard size. At the same time, it can use the existing power lines as the communication medium without additional wiring work, which greatly reduces the construction and maintenance costs of the communication system. It is increasingly recognized by the market and the demand is growing.

[0004] The 86-box smart control panel with power communication technology can use the existing power line as a communication medium without additional wiring. However, because its communication interface shares the power line interface, its EMC (Electro Magnetic Compatibility) electromagnetic environment is very harsh, especially the EMS anti-interference requirements are higher, such as interference from surges, pulse groups, harmonics, etc. from the power grid. At the same time, the temperature and humidity environment of the installation of the 86-box smart controller is also relatively harsh. This kind of 86-box smart controller, if used as a thermostat, may be installed in various rooms in the home, such as bathrooms, kitchens, etc. Therefore, the anti-static ability of the 86-box smart controller panel used for temperature control is also required to be very high: according to the national standard GB / T 17626.2-2018 electrostatic ESD (electro-static discharge) immunity requirements: + / -15KV (air discharge), + / -8KV (contact discharge), according to the national standard GB / T 17626.4-2008 electrical fast transient pulse group immunity EFT (electrical fast transient) requires LN differential mode 4KV 5KHz.

[0005] For this type of 86-box intelligent control panel with power line communication function, because the communication port shares the power line interface and the electromagnetic environment is very harsh, during the EMS electromagnetic compatibility test and verification process, it was found that when the product was undergoing EMS testing, the communication function of the power communication module would be interfered with and unstable, and sometimes there would be extreme situations where it would be locked and unresponsive.

[0006] The improvement of ESD (electro-static discharge) immunity can be achieved through optimization of the shell structure and material, but the improvement of EFT (electrical fast transient) immunity cannot be achieved by simply adding some common-mode inductors, differential-mode inductors, safety capacitors and other EMC devices to the power lines and communication ports, because the communication signals superimposed on the power lines are high-frequency small signals. After these high-frequency small signals are filtered by these common-mode inductors, differential-mode inductors, safety capacitors and other EMC devices, the communication signals are absorbed and weakened, which reduces the product signal sensitivity and thus affects the communication quality. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a control switch circuit, which is applied to a high-precision 86 intelligent temperature control panel with power line communication function and an intelligent control panel with a control switch circuit, and has high temperature control accuracy and communication self-starting function to ensure stable and reliable communication of the product.

[0008] In order to solve the above technical problems, the technical solution of the utility model is: a control switch circuit, the innovation of which is that: the control switch circuit is arranged between the power module and the power communication module, including a PLC Module chip and an AC-DC Module module respectively connected to the power module, a MOS tube Q1 connected to the PLC Module chip, and a triode Q2 connected to the MOS tube Q1, and the PLC Module chip and the power communication module use RX pin and TX pin serial port bidirectional interaction;

[0009] Among them, the drain of MOS tube Q1 is connected to the VDD pin on the PLC Module chip, the source of MOS tube Q1 is connected to the +DC pin on the AC-DC Module, the base of MOS tube Q1 is connected to the collector of transistor Q2, the emitter of transistor Q2 is connected to the GND pin on the AC-DC Module, and the base of transistor Q2 is connected to the trigger pulse signal I / O pin of the power communication module.

[0010] Preferably, the PLC Module chip is a LME2980C chip, and a UART interface for serial communication with an external system is integrated in the PLC Module chip.

[0011] Preferably, a grounded GND pin is provided on the PLC Module chip.

[0012] Preferably, the power communication module is a LCT980C-350D-001 chip.

[0013] Preferably, the power supply module is AC mains.

[0014] Preferably, the +DC pin on the AC-DC Module outputs 12V direct current.

[0015] Preferably, the AC-DC Module module comprises a bridge rectifier circuit and a high-voltage filter circuit which are sequentially connected in series from front to back.

[0016] Preferably, a resistor R2 is connected in series between the base of the MOS tube Q1 and the collector of the transistor Q2;

[0017] A resistor R1 is provided between the base of the MOS transistor Q1 and the source of the MOS transistor Q1 .

[0018] Preferably, the MOS transistor Q1 is a P-channel MOS transistor, and the transistor Q2 is an NPN transistor.

[0019] Preferably, a resistor R4 is provided in series between the base of the transistor Q2 and the trigger pulse signal I / O pin of the power communication module.

[0020] A resistor R3 is provided between a connection point between the trigger pulse signal I / O pin of the power communication module and the resistor R4 and the emitter of the transistor Q2.

[0021] The advantages of the utility model are: the utility model adds an electronic switch circuit between the power module and the power communication module. When the power communication module is interrupted due to external EMC interference and the main control MCU of the 86-box intelligent control panel cannot communicate with the power communication module, the MCU will send a trigger pulse signal to the electronic switch circuit to cut off the VDD power supply of the power communication module from the power module. After the VDD capacitor of the power communication module is discharged, the VDD power supply is restored to automatically restart the power communication module, thereby ensuring the communication sensitivity of the power communication module 86-box intelligent control panel and ensuring that the power communication module 86-box intelligent control panel can work stably and reliably under complex actual EMC environment.

[0022] By adopting the above structure, when the power communication module is subject to external electromagnetic interference (such as surges, pulse groups, harmonics, etc. from the power grid), causing the power communication module to work abnormally and the power communication module to communicate abnormally with the external application system module, the communication function of the power communication module can be restored to normal after the VDD of the power communication module is restarted and discharged. However, for the terminal application customer, the power communication module signal is interrupted, and the panel needs to automatically restart and recover, without the need to manually plug and unplug the power supply of the entire 86-box Zhitong control switch to restore the function. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] Figure 1 The utility model is a circuit block diagram of a control switch circuit.

[0025] In the figure: 1-power module, 2-power communication module, 3-PLC Module chip, 4-AC-DC Module module. DETAILED DESCRIPTION

[0026] The control switch circuit of the utility model is arranged between the power module 1 and the power communication module 2, and includes a PLC Module chip 3 and an AC-DC Module module 4 respectively connected to the power module 1, a MOS tube Q1 connected to the PLC Module chip 3, and a triode Q2 connected to the MOS tube Q1. The PLC Module chip 3 and the power communication module 2 use a RX pin and a TX pin serial port for bidirectional interaction. Among them, the drain of the MOS tube Q1 is connected to the VDD pin on the PLC Module chip 3, the source of the MOS tube Q1 is connected to the +DC pin on the AC-DC Module module 4, the base of the MOS tube Q1 is connected to the collector of the triode Q2, the emitter of the triode Q2 is connected to the GND pin on the AC-DC Module module 4, and the base of the triode Q2 is connected to the trigger pulse signal I / O pin of the power communication module 2. The utility model adds an electronic switch circuit between the power module 1 and the power communication module 2. When the power communication module is interrupted and the main control MCU of the 86-box intelligent control panel cannot communicate with the power communication module, the MCU will send a trigger pulse signal to the electronic switch circuit to cut off the VDD power supply from the power module 1 to the power communication module 2. After the VDD capacitor of the power communication module 2 is discharged, the VDD power supply is restored, so that the power communication module 2 is automatically restarted, which ensures the communication sensitivity of the power communication module 86-box intelligent control panel and ensures that the power communication module 86-box intelligent control panel can work stably and reliably under a complex actual EMC environment.

[0027] The above-mentioned PLC Module chip 3 is a LME2980C chip. The PLC Module chip 3 is integrated with a UART interface for serial communication with an external system. The PLC Module chip 3 is provided with a grounded GND pin. The PLC Module chip is internally integrated with a high-speed enhanced 8-bit microprocessor, which can run the power line carrier communication protocol and user programs, has a large-capacity program storage space and data RAM, and is internally integrated with a UART interface, which can communicate with the external system serial port. The specific working principle is: the PLC Module chip 3 receives the communication signal (analog signal) from the mains through the power line port (LN), converts it into digital format information through analog-to-digital conversion (ADC conversion), processes it through the internal MCU, and then communicates with the MCU of the external system through the UART interface, wherein the 12VDC is provided by the AC-DC Module 4.

[0028] The power communication module 2 of the utility model is a LCT980C-350D-001 chip; the power supply module 1 is AC mains power.

[0029] The +DC pin on the AC-DC Module 4 of the utility model outputs 12V direct current. The AC-DC Module 4 includes a bridge rectifier circuit and a high-voltage filter circuit arranged in series from front to back. The bridge rectifier circuit and the high-voltage filter circuit are conventional structures and are not described here. The main function of the AC-DC Module 4 is to provide a stable DC power supply isolated from the strong electricity of the mains for the PLC Module chip. The specific working principle is: the mains is rectified by a bridge, and then passes through a high-voltage filter capacitor to obtain a DC high voltage. The flyback power converter composed of a transformer and a pulse regulation control main control IC converts the DC high voltage into a high-frequency AC low voltage, and then passes through the output rectification and the output filter capacitor for energy storage filtering to obtain a 12V DC power supply. Among them, the voltage stabilization link is to feed back the signal to the pulse regulation control main control IC through an optical coupler through the output voltage stabilization device and related peripheral components, forming a signal control closed loop, and through the cooperation of related auxiliary components, the required stable DC power supply is obtained.

[0030] A resistor R2 is provided in series between the base of the MOS tube Q1 and the collector of the transistor Q2. A resistor R1 is provided between the base of the MOS tube Q1 and the source of the MOS tube Q1. The MOS tube Q1 is a P-channel MOS tube, and the transistor Q2 is an NPN transistor. A resistor R4 is provided in series between the base of the transistor Q2 and the trigger pulse signal I / O pin of the power communication module 2. A resistor R3 is provided between the connection point between the trigger pulse signal I / O pin of the power communication module 2 and the resistor R4 and the emitter of the transistor Q2.

[0031] The working principle of the utility model is as follows:

[0032] The trigger pulse signal I / O pin provided by the MCU of the power communication system is always at a high level. At this time, the NPN transistor Q2 is in the on state, and the P-channel MOS tube Q1 is also in the on state because the base is pulled down by the NPN transistor Q2. At this time, the output +DC pin of the AC-DC Module module 4 supplies power to the VDD tube of the PLC Module chip normally, and the PLC Module chip can communicate normally with the MCU of the power communication system.

[0033] When electromagnetic interference such as surges, pulse groups, harmonics and static electricity from the power grid causes abnormal communication between the PLC Module chip and the MCU of the power communication system, the MCU of the power communication system gives a low level to the trigger pulse signal I / O pin. At this time, the NPN transistor Q2 is in the cut-off state, and the P-channel MOS tube Q1 is in the cut-off state because the base is in a high level. At this time, the output +DC pin output of the AC-DC Module module 4 stops supplying power to the VDD pin of the PLC Module chip because the P-channel MOS tube Q1 is in the cut-off state. At this time, the VDD pin of the PLC Module chip needs to continue to supply power to the PLC Module chip, and the VDD pin voltage will gradually decrease until it is lower than the voltage required for the normal operation of the PLC Module.

[0034] At this time, the PLC Module chip stops working, and the MCU of the power communication system gives a high level to the trigger pulse signal I / O pin. At this time, the NPN transistor Q2 is in the on state again, and the P-channel MOS tube Q1 is also in the on state because the base is pulled down by the NPN transistor Q2. At this time, the output +DC pin of the AC-DC Module chip charges the capacitor of the VDD pin of the PLC Module chip, and the voltage of the VDD pin of the PLC Module chip gradually increases. When this voltage is higher than the voltage required for the PLC Module chip to work, the PLC Module chip restarts and restores normal communication with the MCU of the power communication system, and the entire 86-box intelligent control panel also resumes normal operation.

[0035] The above description is intended to be illustrative and not limiting. Upon reading the above description, many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents possessed by these claims. For the purpose of comprehensiveness, all articles and references, including the disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of the subject matter, nor should it be considered that the inventor has not considered the subject matter as part of the disclosed utility model subject matter.

Claims

1. A control switch circuit, characterized in that: The control switch circuit is arranged between the power module and the power communication module, including a PLC Module chip and an AC-DC Module module respectively connected to the power module, a MOS tube Q1 connected to the PLC Module chip, and a triode Q2 connected to the MOS tube Q1. The PLC Module chip and the power communication module use a RX pin and a TX pin serial port for bidirectional interaction; Among them, the drain of the MOS tube Q1 is connected to the VDD pin on the PLC Module chip, the source of the MOS tube Q1 is connected to the +DC pin on the AC-DC Module, the base of the MOS tube Q1 is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is connected to the GND pin on the AC-DC Module, and the base of the transistor Q2 is connected to the trigger pulse signal I / O pin of the power communication module.

2. A control switch circuit as claimed in claim 1, characterized in that: The PLC Module chip is a LME2980C chip, and a UART interface for serial communication with an external system is integrated in the PLC Module chip.

3. A control switch circuit as claimed in claim 2, characterized in that: The PLC Module chip is provided with a grounded GND pin.

4. A control switch circuit as claimed in claim 1, characterized in that: The power communication module is a LCT980C-350D-001 chip.

5. A control switch circuit as claimed in claim 1, characterized in that: The power supply module is AC power.

6. A control switch circuit as claimed in claim 1, characterized in that: The +DC pin on the AC-DC Module outputs 12V direct current.

7. A control switch circuit as claimed in claim 6, characterized in that: The AC-DC Module includes a bridge rectifier circuit and a high-voltage filter circuit which are sequentially connected in series from front to back.

8. A control switch circuit as claimed in claim 1, characterized in that: A resistor R2 is connected in series between the base of the MOS tube Q1 and the collector of the transistor Q2; A resistor R1 is provided between the base of the MOS transistor Q1 and the source of the MOS transistor Q1 .

9. A control switch circuit as claimed in claim 8, characterized in that: The MOS transistor Q1 is a P-channel MOS transistor, and the transistor Q2 is an NPN transistor.

10. A control switch circuit as claimed in claim 1, characterized in that: A resistor R4 is arranged in series between the base of the transistor Q2 and the trigger pulse signal I / O pin of the power communication module; A resistor R3 is provided between a connection point between the trigger pulse signal I / O pin of the power communication module and the resistor R4 and the emitter of the transistor Q2.

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