An infrared meter reading transceiver

Abstract

The utility model discloses an infrared meter reading transceiver device, including an MCU, a voltage stabilizing module, an external module, a transceiver module, a connector module, a temperature detection and alarm module, a power supply module and an infrared module; the voltage stabilizing module includes an integrated voltage stabilizing circuit; the external module includes an external reset circuit; the transceiver module includes a transceiver and a line end protection circuit, and the line end protection circuit includes a plurality of series-connected protection resistors, a ground shunt resistor and an active voltage divider resistor; the temperature detection and alarm module includes a temperature detection circuit and a buzzer circuit; the connector module includes an infrared connector, a current limiting resistor and a filter capacitor. The present invention selects low-cost devices to reduce costs; optimizes the internal circuit of the meter reading, and adds voltage stabilizing, filtering and shunting related circuits or devices while simplifying, thereby improving the performance of the device; in addition, a temperature detection and alarm module and a plurality of protection resistors are added to effectively protect the device.

Description

Technical Field

[0001] The utility model relates to the technical field of electric meter reading, in particular to an infrared meter reading transceiver. Background Art

[0002] In the field of meter reading technology, with the continuous development of intelligence and automation, the traditional manual meter reading method has gradually failed to meet the needs of modern power management. As an efficient and accurate meter reading method, infrared meter reading technology has gradually been widely used.

[0003] There are three types of infrared meter reading currently used. The first type is a high-performance infrared handheld device, which has the characteristics of high cost and high professionalism. It is generally only used by very experienced professionals and difficult for newcomers to use. The second type is a meter reading that combines mobile devices with infrared, which is easier to use than the first type but still difficult to operate and has a high cost. The third type is a common infrared meter reading that is more commonly used by ordinary practitioners. It is cheap but has poor performance. However, these current infrared meter readings have at least the following three problems:

[0004] 1) High cost;

[0005] 2) Failure to consider interference or weak anti-interference capability leads to unstable data during actual meter reading;

[0006] 3) Lack of adequate protection for meter reading. Utility Model Content

[0007] In view of the above three problems, the utility model aims to propose an infrared meter reading transceiver, which effectively reduces the cost by selecting low-cost components; it also optimizes the internal circuit structure of the meter reading device, and adds circuits or components related to voltage stabilization, filtering and shunting while simplifying the connection, so as to effectively improve the performance of the device and enhance the anti-interference ability; in addition, a temperature detection and alarm module and multiple protection resistors are added to effectively protect the meter reading device.

[0008] This is achieved through the following technical solutions:

[0009] An infrared meter reading transceiver device comprises an MCU, a voltage stabilizing module, an external module, a transceiver module, a connector module, a temperature detection and alarm module, a power supply module and an infrared module; wherein the MCU comprises a reset end, a receiving end, a transmitting end, an output end, an enable end and a power supply end, the reset end of the MCU is connected to the external module, the receiving end, the transmitting end and the enable end of the MCU are all connected to the transceiver module, the output end of the MCU is also connected to the connector module, the enable end of the MCU is connected to the transceiver module via the infrared module, and the power supply module is connected to the power supply end of the MCU via the voltage stabilizing module; the voltage stabilizing module comprises an integrated voltage stabilizing circuit, and the integrated voltage stabilizing circuit is respectively connected to the power supply module and the power supply end of the MCU; the external module comprises an external reset circuit, and the external reset circuit is connected to the reset end of the MCU; the transceiver module comprises a transceiver and a line end protection circuit, and the transceiver comprises a first end and a second end, and the first end is respectively connected to the MCU The receiving end and the transmitting end of the transceiver are connected to the line end protection circuit at the second end, and the line end protection circuit includes a plurality of protection resistors connected in series and a ground shunt resistor and an active voltage divider resistor respectively connected in parallel with the plurality of protection resistors connected in series; the temperature detection and alarm module includes a temperature detection circuit and a buzzer circuit connected in parallel, and the temperature detection circuit and the buzzer circuit are respectively connected to the first end and the second end of the transceiver; the connector module includes an infrared connector, a current limiting resistor and a filter capacitor, the infrared connector is connected to the output end of the MCU through the current limiting resistor, the filter capacitor is connected in parallel between the current limiting resistor and the infrared connector, and the infrared connector is connected to a data line; the infrared module includes a light-emitting diode LED1, a transistor, a base resistor and a light-emitting power supply, the base of the transistor is connected to the enable end of the MCU through the base resistor, the emitter of the transistor is grounded, and the collector of the transistor is connected to the light-emitting power supply through the light-emitting diode LED1.

[0010] Using MCU to control the connection of multiple modules can effectively ensure the stable operation of meter reading; the temperature detection and alarm module cooperates with multiple protection resistors to effectively protect the circuit; the voltage stabilizing module, current limiting resistor and filter capacitor can effectively reduce interference, improve the performance of the meter reading transceiver and make it more stable.

[0011] Preferably, the integrated voltage stabilizing circuit includes a diode D1, a first voltage stabilizing filter capacitor, a voltage stabilizing chip and a second voltage stabilizing filter capacitor, the forward input end of the diode D1 is connected to the power supply module, the forward output end of the diode D1 is connected to the input end of the voltage stabilizing chip, the output end of the voltage stabilizing chip is connected to the power supply end of the MCU, the first voltage stabilizing filter capacitor is connected in parallel between the forward output end of the diode D1 and the input end of the voltage stabilizing chip, and the second voltage stabilizing filter capacitor is connected in parallel between the output end of the voltage stabilizing chip and the power supply end of the MCU. The integrated voltage stabilizing circuit can provide a stable and reliable power supply while effectively protecting infrared meter reading.

[0012] Preferably, the structure of the external reset circuit is an active grounding capacitor or a parallel RC structure; the parallel RC structure includes a grounding capacitor and an active large resistor, and the grounding capacitor and the active large resistor are connected in parallel to the reset terminal of the MCU. The active grounding capacitor or the parallel RC structure can be designed and adjusted according to specific system requirements, and has certain flexibility and adjustability.

[0013] Preferably, the light emitting diode LED1 of the infrared module is composed of a light emitting diode LED11 and a light emitting diode LED12 connected in parallel, a current limiting resistor R1 is connected in series to the forward input end of the light emitting diode LED11, and a current limiting resistor R2 is connected in series to the forward input end of the light emitting diode LED12. Using two light emitting diodes in parallel can effectively ensure the operation of the infrared module, and even if one is damaged, the other can still perform a certain light emitting work.

[0014] Preferably, the infrared connector and LED1 are both devices with an operating frequency of 38kHz, and the power supply module has an anti-reverse connection structure, which is a diode anti-reverse connection structure, a MOS tube anti-reverse connection structure, or a rectifier bridge type anti-reverse connection structure. The anti-reverse connection structure can effectively protect the safety of the equipment.

[0015] Preferably, a temperature detection and alarm module is further included, wherein the temperature detection and alarm module includes a temperature detection circuit and a buzzer circuit connected in parallel, and the temperature detection circuit and the buzzer circuit are respectively connected to the first end and the second end of the transceiver. The temperature detection and alarm module can reduce the damage problem caused by the infrared meter reading transceiver working at an inappropriate temperature.

[0016] Preferably, the second end of the transceiver is provided with an RS485 interface, and the RS485 interface is connected to the data line through the line end protection circuit. The RS485 interface is adapted to multiple protocols and has many general use scenarios.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The technical solution of the utility model effectively reduces the cost by selecting low-cost components; it also optimizes the circuit structure inside the meter reading device, and adds circuits or components related to voltage stabilization, filtering and shunting while simplifying the connection, effectively improving the performance of the device and enhancing the anti-interference ability; in addition, a temperature detection and alarm module and multiple protection resistors are added to effectively protect the meter reading device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an infrared meter reading transceiver;

[0020] Figure 2 It is a structural schematic diagram of an integrated voltage stabilizing circuit;

[0021] Figure 3 The figure is a schematic diagram of the circuit structure inside a transceiver module. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention. Example

[0023] like Figure 1 As shown, it is a structural schematic diagram of an infrared meter reading transceiver device, which includes an MCU, a voltage stabilizing module, an external module, a transceiver module, a connector module, a temperature detection and alarm module, a power supply module and an infrared module. Among them, the MCU can adopt the HK32F030MF4P6 chip, which includes a reset end, a receiving end, a transmitting end, an output end, an enable end and a power supply end. The reset end is connected to the external module for the reset control of the chip. The receiving end, the transmitting end and the enable end of the MCU are all connected to the transceiver module. The output end of the MCU is also connected to the connector module. The enable end of the MCU is connected to the transceiver module through the infrared module. The power supply module is connected to the power supply end of the MCU through the voltage stabilizing module.

[0024] Figure 3 A schematic diagram of the circuit structure inside a transceiver module, combined with Figure 1 and Figure 3 As shown, the transceiver module includes a transceiver and a line end protection circuit. The transceiver can use a MAX3485ED transceiver, including a first end and a second end. The first end is connected to the receiving end and the transmitting end of the MCU respectively to realize signal transmission between the MCU and the line end protection circuit. The line end protection circuit is used to protect the transceiver when sending and receiving signals to reduce the occurrence of overcurrent and overvoltage. It includes multiple series-connected protection resistors and grounded shunt resistors and active voltage-dividing resistors that are respectively connected in parallel with the multiple series-connected protection resistors. The series-connected protection resistors are R3, R4 and R5, and the resistance value is adjustable; the grounded shunt resistor is R6, and R6 needs to have a larger resistance value, such as 10KΩ, for current limiting and preventing static electricity; the active voltage-dividing resistor is R7, and R7 also needs to have a larger resistance value, such as 10KΩ, which can divide the voltage and prevent static discharge, increase the stability and reliability of transmission, and the power supply used by R7 can use a smaller power supply, such as a 3.3V power supply.

[0025] In this embodiment, the transceiver is also connected to a 3.3V power supply for power supply to ensure the normal operation of the transceiver. A grounding capacitor C1 is also connected in parallel between the transceiver and the 3.3V power supply for filtering and decoupling to reduce noise, prevent the generation of large current, and ensure the performance of the transceiver.

[0026] In the present embodiment, the temperature detection and alarm module includes a temperature detection circuit and a buzzer circuit in parallel, and the temperature detection circuit and the buzzer circuit are respectively connected to the first end and the second end of the transceiver. The connector module includes an infrared connector, a current limiting resistor and a filter capacitor, the infrared connector is connected to the output end of the MCU through the current limiting resistor, the filter capacitor is connected in parallel between the current limiting resistor and the infrared connector, and the infrared connector is connected with a data line. The infrared module includes a light-emitting diode LED1, a transistor, a base resistor and a light-emitting power supply, the base of the transistor is connected to the enable end of the MCU through the base resistor, the emitter of the transistor is grounded, and the collector of the transistor is connected to the light-emitting power supply through the light-emitting diode LED1.

[0027] Figure 2 It is a structural schematic diagram of an integrated voltage stabilizing circuit, the voltage stabilizing module includes an integrated voltage stabilizing circuit, and the integrated voltage stabilizing circuit is respectively connected to the power supply module and the power supply end of the MCU. Specifically, the integrated voltage stabilizing circuit includes a diode D1, a first voltage stabilizing filter capacitor C2, a voltage stabilizing chip and a second voltage stabilizing filter capacitor C3, the forward input end of the diode D1 is connected to the power supply module, the diode D1 is used to ensure the accuracy of the transmission direction, the forward output end of the diode D1 is connected to the input end of the voltage stabilizing chip, the output end of the voltage stabilizing chip is connected to the power supply end of the MCU, and the voltage stabilizing chip can use an MD7533H chip. The first voltage stabilizing filter capacitor C2 is connected in parallel between the forward output end of the diode D1 and the input end of the voltage stabilizing chip for filtering, the second voltage stabilizing filter capacitor is connected in parallel between the output end of the voltage stabilizing chip and the power supply end of the MCU, and is also used for filtering, the first voltage stabilizing filter capacitor C2 and the second voltage stabilizing filter capacitor C3 are each connected in parallel with a corresponding power supply and are each grounded, while filtering, the accuracy of the transmission direction can also be further guaranteed.

[0028] In addition, a frequency compensation circuit can be set in the voltage stabilizing module or the infrared module to compensate for the insufficient frequency of the signal in the circuit so that it meets the frequency requirements of the infrared meter reading device. The structure of the specific frequency compensation circuit can be designed in combination with an operational amplifier, a frequency band expansion circuit, a low-pass filter, and a parallel compensation structure. The frequency compensation circuit is relatively common and can be designed accordingly according to actual needs, so it will not be described in detail here.

[0029] In this embodiment, the external module includes an external reset circuit, which is connected to the reset terminal of the MCU. The structure of the external reset circuit is an active grounding capacitor or a parallel RC structure; the parallel RC structure includes a grounding capacitor and an active large resistor, which are connected to the reset terminal of the MCU in parallel. The active grounding capacitor or the parallel RC structure can be designed and adjusted according to the specific system requirements, and has certain flexibility and adjustability.

[0030] In this embodiment, the light emitting diode LED1 of the infrared module is composed of a light emitting diode LED11 and a light emitting diode LED12 connected in parallel, a current limiting resistor R1 is connected in series to the positive input end of the light emitting diode LED11, and a current limiting resistor R2 is connected in series to the positive input end of the light emitting diode LED12. Using two light emitting diodes in parallel can effectively ensure the operation of the infrared module, and even if one is damaged, the other can still perform a certain light emitting work, and the stability and practicality are higher.

[0031] In this embodiment, the infrared connector and LED1 are both devices with an operating frequency of 38kHz, and the power supply module has an anti-reverse connection structure, which is a diode anti-reverse connection structure, a MOS tube anti-reverse connection structure, or a rectifier bridge type anti-reverse connection structure. The anti-reverse connection structure is an indispensable part of the infrared meter reading device, which can prevent equipment damage or safety accidents caused by reverse polarity of the power supply, and improve the stability and safety of the system.

[0032] This embodiment also includes a temperature detection and alarm module, which includes a temperature detection circuit and a buzzer circuit connected in parallel, and the temperature detection circuit and the buzzer circuit are respectively connected to the first end and the second end of the transceiver. The temperature detection circuit can limit the operating temperature, such as the normal operating temperature of -20℃~55℃ and the extreme operating temperature of -25℃~60℃. Once the temperature range is exceeded, the buzzer circuit will immediately alarm to remind the staff not to use the device anymore, thereby avoiding damage to the device.

[0033] In this embodiment, the second end of the transceiver is provided with an RS485 interface, which is connected to the data line through a line end protection circuit. The RS485 interface is a pure transparent transmission and non-encrypted design. In theory, there is no protocol restriction. In practice, it can at least support multiple protocols such as DL / 645-1997, DL / 645-2007, DL / T698.45-2017, Modbus, CJ / T188, DLMS and other protocols in the power industry, and has a wide range of application scenarios.

[0034] In summary, the utility model effectively reduces costs by selecting low-cost components; it also optimizes the internal circuit structure of the meter reading device, and adds circuits or components related to voltage stabilization, filtering and shunting while simplifying the connection, effectively improving the performance of the device and improving the anti-interference ability; in addition, it also adds a temperature detection and alarm module and multiple protection resistors to effectively protect the meter reading device, which is significantly progressive.

[0035] The above embodiments are only for illustrating the technical idea of ​​the present utility model, and cannot be used to limit the protection scope of the present utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present utility model shall fall within the protection scope of the present utility model.

Claims

1. An infrared meter reading transceiver, characterized in that: Including MCU, voltage stabilization module, external module, transceiver module, connector module, temperature detection and alarm module, power supply module and infrared module; Among them, the MCU includes a reset end, a receiving end, a transmitting end, an output end, an enable end and a power supply end. The reset end of the MCU is connected to the external module, the receiving end, the transmitting end and the enable end of the MCU are all connected to the transceiver module, the output end of the MCU is also connected to the connector module, the enable end of the MCU is connected to the transceiver module through the infrared module, and the power supply module is connected to the power supply end of the MCU through the voltage stabilizing module; The voltage stabilizing module includes an integrated voltage stabilizing circuit, which is respectively connected to the power supply module and the power supply end of the MCU; the external module includes an external reset circuit, which is connected to the reset end of the MCU; the transceiver module includes a transceiver and a line end protection circuit, the transceiver includes a first end and a second end, the first end is respectively connected to the receiving end and the transmitting end of the MCU, and the second end is connected to the line end protection circuit, the line end protection circuit includes a plurality of protection resistors connected in series and a ground shunt resistor and an active voltage divider resistor respectively connected in parallel with the plurality of protection resistors connected in series; the temperature detection and alarm module includes a temperature detection circuit and The buzzer circuit, the temperature detection circuit and the buzzer circuit are respectively connected to the first end and the second end of the transceiver; the connector module includes an infrared connector, a current limiting resistor and a filter capacitor, the infrared connector is connected to the output end of the MCU through the current limiting resistor, the filter capacitor is connected in parallel between the current limiting resistor and the infrared connector, and the infrared connector is connected to a data line; the infrared module includes a light-emitting diode LED1, a transistor, a base resistor and a light-emitting power supply, the base of the transistor is connected to the enable end of the MCU through the base resistor, the emitter of the transistor is grounded, and the collector of the transistor is connected to the light-emitting power supply through the light-emitting diode LED1.

2. The infrared meter reading transceiver according to claim 1, characterized in that: The integrated voltage stabilizing circuit includes a diode D1, a first voltage stabilizing filter capacitor, a voltage stabilizing chip and a second voltage stabilizing filter capacitor. The forward input end of the diode D1 is connected to the power supply module, the forward output end of the diode D1 is connected to the input end of the voltage stabilizing chip, the output end of the voltage stabilizing chip is connected to the power supply end of the MCU, the first voltage stabilizing filter capacitor is connected in parallel between the forward output end of the diode D1 and the input end of the voltage stabilizing chip, and the second voltage stabilizing filter capacitor is connected in parallel between the output end of the voltage stabilizing chip and the power supply end of the MCU.

3. The infrared meter reading transceiver according to claim 1, characterized in that: The structure of the external reset circuit is an active grounding capacitor or a parallel RC structure; the parallel RC structure includes a grounding capacitor and an active large resistor, and the grounding capacitor and the active large resistor are connected in parallel to the reset terminal of the MCU.

4. The infrared meter reading transceiver according to claim 1, characterized in that: The light emitting diode LED1 of the infrared module is composed of a light emitting diode LED11 and a light emitting diode LED12 connected in parallel, a current limiting resistor R1 is connected in series to the forward input end of the light emitting diode LED11, and a current limiting resistor R2 is connected in series to the forward input end of the light emitting diode LED12.

5. The infrared meter reading transceiver according to claim 1, characterized in that: The infrared connector and LED1 are both devices with an operating frequency of 38kHz. The power supply module has an anti-reverse connection structure, which is a diode anti-reverse connection structure, a MOS tube anti-reverse connection structure, or a rectifier bridge type anti-reverse connection structure.

6. The infrared meter reading transceiver according to claim 1, characterized in that: The second end of the transceiver is provided with an RS485 interface, and the RS485 interface is connected to the data line through a line end protection circuit.

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