Alternating-current voltage-stabilized power supply hybrid protection circuit

Abstract

The utility model discloses a hybrid protection circuit for an alternating-current voltage-stabilized power supply, which comprises a system display screen circuit, a three-way temperature sensor temperature measurement interface circuit, a data memory circuit, an alarm buzzer circuit, a voltage regulation circuit, an over-temperature protection circuit, a system voltage measurement circuit, a master control MCU (Microprogrammed Control Unit) circuit, a display signal amplification circuit and a system 220V alternating-current power supply circuit, the master control MCU circuit is connected with a system display screen circuit, a three-way temperature sensor temperature measurement interface circuit, a data memory circuit, an alarm buzzer circuit, a voltage regulation circuit, an over-temperature protection circuit, a system voltage measurement circuit, a display signal amplification circuit and a system 220V alternating current power supply circuit. According to the alternating-current voltage-stabilized power supply hybrid protection circuit of the utility model, the three temperature sensors monitor and protect the three groups of transformers of the alternating-current voltage-stabilized cabinet, and DS18B20 is adopted to sample the temperature of the transformers inside the alternating-current voltage-stabilized cabinet, so that the transformers can be protected efficiently and comprehensively.

Description

Technical Field

[0001] The utility model relates to the field of voltage stabilizing power supply protection, in particular to an AC voltage stabilizing power supply hybrid protection circuit. Background Technique

[0002] The AC voltage stabilizing power supply hybrid protection circuit is an overvoltage and undervoltage protection circuit for automatic voltage regulation. During the use of the device, overload can also cause the temperature rise of the transformer. In addition to the temperature rise caused by overload, poor carbon brush contact can also cause the temperature rise. Therefore, using the method of temperature measurement to protect the device can protect the device more effectively than the method of current detection. With the continuous development of technology, people's requirements for the manufacturing process of the AC voltage stabilizing power supply hybrid protection circuit are also getting higher and higher.

[0003] There are certain drawbacks in the use of the existing AC voltage stabilizing power supply hybrid protection circuit. During the use of the AC voltage stabilizing power supply, the phenomenon of transformer burnout often occurs. Generally, the method of measuring current is used to prevent transformer burnout during normal operation, while the solution adopted in this scheme is to use the method of temperature measurement to solve transformer burnout. During the use of the AC voltage regulator, it is found that in addition to burnout caused by overcurrent, there is also the phenomenon of transformer burnout caused by poor carbon brush contact in the voltage regulator; most of the existing products use the method of current detection to solve transformer burnout, but the current can only reflect the situation of current overload, and the over-temperature caused by poor contact due to carbon brush aging cannot be solved. Therefore, we propose an AC voltage stabilizing power supply hybrid protection circuit. Content of the Utility Model

[0004] Technical problems to be solved: Aiming at the deficiencies of the prior art, the utility model provides an AC voltage stabilizing power supply hybrid protection circuit. Three-way temperature sensors monitor and protect three groups of transformers in the AC voltage stabilizing cabinet. The DS18B20 is used to sample the temperature of the transformers inside the AC voltage stabilizing cabinet, realizing efficient and comprehensive protection of the transformers, and can effectively solve the problems in the background technique.

[0005] Technical solution: To achieve the above purpose, the technical solution adopted by the utility model is: an AC voltage stabilizing power supply hybrid protection circuit, including a system display screen circuit, a three-way temperature sensor temperature measurement interface circuit, a data memory circuit, an alarm buzzer circuit, a voltage regulation circuit and an over-temperature protection circuit, a system voltage measurement circuit, a main control MCU circuit, a display signal amplification circuit and a system 220V AC power supply circuit. The main control MCU circuit is connected to the system display screen circuit, the three-way temperature sensor temperature measurement interface circuit, the data memory circuit, the alarm buzzer circuit, the voltage regulation circuit and the over-temperature protection circuit, the system voltage measurement circuit, the display signal amplification circuit and the system 220V AC power supply circuit.

[0006] Preferably, an LCD, a display driver, a key circuit, a BLED backlight, a display driver signal amplification circuit, and a cable interface connected to the main board are provided in the system display screen circuit.

[0007] Preferably, a single-bus DS18B20 sensor is provided in the three-way temperature sensor temperature measurement interface circuit, and the measurement range is -55 to 125 degrees.

[0008] Preferably, an output rate adjustable chip is provided in the system voltage measurement circuit, and a 50HZ / 60HZ data output rate is selected according to the working frequency.

[0009] Preferably, the display signal amplification circuit increases the current of the output signal while keeping the 5V voltage of the main control MCU circuit unchanged.

[0010] Beneficial effects: Compared with the prior art, the present utility model provides a hybrid protection circuit for an AC voltage stabilizer power supply, having the following beneficial effects: For this hybrid protection circuit for an AC voltage stabilizer power supply, three-way temperature sensors monitor and protect three groups of transformers in the AC voltage stabilizer cabinet. The DS18B20 is used to sample the temperature of the internal transformers in the AC voltage stabilizer cabinet, achieving efficient and comprehensive protection of the transformers; three temperature probes are provided, and the temperature measurement points are arranged near each transformer or carbon brush contact to monitor the temperature change of the transformer in real time. When the temperature reaches the set value, the system cuts off the system power supply and stops the voltage stabilizer from working, which can avoid equipment burnout. The entire hybrid protection circuit for the AC voltage stabilizer power supply has a simple structure, convenient operation, and better use effects compared to traditional methods. Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the system display screen circuit in a hybrid protection circuit for an AC voltage stabilizer power supply of the present utility model.

[0012] Figure 2 It is a schematic diagram of the three-way temperature sensor temperature measurement interface circuit in a hybrid protection circuit for an AC voltage stabilizer power supply of the present utility model.

[0013] Figure 3 It is a schematic diagram of the data memory circuit in a hybrid protection circuit for an AC voltage stabilizer power supply of the present utility model.

[0014] Figure 4 It is a schematic diagram of the alarm buzzer circuit in a hybrid protection circuit for an AC voltage stabilizer power supply of the present utility model.

[0015] Figure 5 It is a schematic diagram of the voltage regulation and over-temperature protection circuit in a hybrid protection circuit for an AC voltage stabilizer power supply of the present utility model.

[0016] Figure 6This is a schematic diagram of the system voltage measurement circuit in a hybrid protection circuit of an AC voltage stabilizer power supply for the present utility model.

[0017] Figure 7 This is a schematic diagram of the system voltage measurement circuit (the second one) in a hybrid protection circuit of an AC voltage stabilizer power supply for the present utility model.

[0018] Figure 8 This is a schematic diagram of the main control MCU circuit in a hybrid protection circuit of an AC voltage stabilizer power supply for the present utility model.

[0019] Figure 9 This is a schematic diagram of the display signal amplification circuit in a hybrid protection circuit of an AC voltage stabilizer power supply for the present utility model.

[0020] Figure 10 This is a schematic diagram of the system 220V AC power supply circuit (the first one) in a hybrid protection circuit of an AC voltage stabilizer power supply for the present utility model.

[0021] Figure 11 This is a schematic diagram of the system 220V AC power supply circuit (the second one) in a hybrid protection circuit of an AC voltage stabilizer power supply for the present utility model. Detailed implementation manners

[0022] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings and specific implementation manners. However, those skilled in the art will understand that the following described embodiments are some embodiments of the present utility model, rather than all embodiments, and are only used to illustrate the present utility model and should not be construed as limiting the scope of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of the present utility model. For those conditions not specified in the embodiments, they shall be carried out according to the conventional conditions or the conditions recommended by the manufacturer. Those reagents or instruments not specified by the manufacturer can be obtained as conventional products through commercial purchase.

[0023] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0024] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "linkage" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] As Figures 1-11 shown, an AC voltage stabilizer hybrid protection circuit includes a system display circuit, a three-way temperature sensor temperature measurement interface circuit, a data memory circuit, an alarm buzzer circuit, a voltage regulation circuit, an over-temperature protection circuit, a system voltage measurement circuit, a main control MCU circuit, a display signal amplification circuit, and a system 220V AC power supply circuit. The main control MCU circuit is connected to the system display circuit, the three-way temperature sensor temperature measurement interface circuit, the data memory circuit, the alarm buzzer circuit, the voltage regulation circuit, the over-temperature protection circuit, the system voltage measurement circuit, the display signal amplification circuit, and the system 220V AC power supply circuit. The three-way temperature sensors monitor and protect the three groups of transformers in the AC voltage stabilizer cabinet. The DS18B20 is used to sample the temperature of the internal transformers of the AC voltage stabilizer cabinet, achieving efficient and comprehensive protection of the transformers.

[0026] Further, an LCD, a display driver, a key circuit, a BLED backlight, a display driver signal amplification circuit, and a cable interface connecting to the main board are provided in the system display circuit.

[0027] Further, a single-bus DS18B20 sensor is provided in the three-way temperature sensor temperature measurement interface circuit, and the measurement range is -55 to 125 degrees.

[0028] Further, an output rate adjustable chip is provided in the system voltage measurement circuit, and the 50HZ / 60HZ data output rate is selected according to the operating frequency.

[0029] Further, the display signal amplification circuit increases the current of the output signal while keeping the 5V voltage of the main control MCU circuit unchanged.

[0030] System display circuit

[0031] The LCD is a liquid crystal display, the TM1621 is a display driver; S1 to S4 are the key circuits; the BLED is the backlight; Q1, Q2, Q3 are the display driver signal amplification circuits, and P1 to P2 are the cable interfaces connecting to the main board. Because of adding the signal amplification circuit, it can be connected up to 10 meters at most to ensure that the signal is normal.

[0032] Three-way temperature sensor temperature measurement interface. Using a single-bus DS18B20 sensor, the measurable range is -55 to 125 degrees.

[0033] Data memory, which can store the corresponding set values.

[0034] Alarm buzzer. When overvoltage, undervoltage, or overtemperature occurs, the buzzer sounds to remind that the product is abnormal and needs maintenance.

[0035] Voltage regulating circuit and overtemperature protection device, mainly used to control the voltage regulating motor. The SRD-12VDC relay provides signals for equipment startup and protection.

[0036] System voltage measurement circuit. CS5460 is a chip with adjustable output rate, and the highest data output rate can be selected as 50HZ / 60HZ according to the working frequency. High-speed measurement facilitates rapid output adjustment and realizes the rapid stabilization of the AC voltage stabilizer.

[0037] Display signal amplification circuit. Without changing the 5V voltage of the MCU, it can increase the current of the output signal, so as to realize the distortion-free transmission of long-distance SPI signal information. The display cable can be up to dozens of meters long.

[0038] The DS18B20 is used to sample the temperature of the internal transformer of the AC voltage stabilizer cabinet, realizing efficient and comprehensive protection of the transformer. During normal use, if the current is overloaded, it will also cause the transformer to heat up. Therefore, using temperature to monitor the operation of the transformer can not only monitor overload, but also protect against overtemperature of the carbon brush. Combined with the monitoring of the output voltage, it realizes comprehensive protection of the AC voltage stabilizer.

[0039] It should be noted that in this article, relational terms such as first and second (No. 1, No. 2, etc.) are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0040] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and all these changes and improvements fall within the scope of the present utility model claimed.

Claims

1. A hybrid protection circuit for an AC voltage stabilizer power supply, comprising a system display screen circuit, a three-way temperature sensor temperature measurement interface circuit, a data memory circuit, an alarm buzzer circuit, a voltage regulation circuit, an over-temperature protection circuit, a system voltage measurement circuit, a main control MCU circuit, a display signal amplification circuit, and a system 220V AC power supply circuit, characterized in that: The main control MCU circuit is connected to the system display screen circuit, the temperature measurement interface circuit of three-way temperature sensors, the data memory circuit, the alarm buzzer circuit, the voltage regulation circuit, the over-temperature protection circuit, the system voltage measurement circuit, the display signal amplification circuit and the system 220V AC power supply circuit.

2. The hybrid protection circuit of an AC voltage stabilizing power supply according to claim 1, wherein: The system display screen circuit is provided with an LCD, a display driver, a key circuit, a BLED backlight, a display driver signal amplification circuit and a cable interface connecting to the main board.

3. The hybrid protection circuit of an AC voltage stabilizing power supply according to claim 1, characterized in that: The temperature measurement interface circuit of the three-way temperature sensors is provided with a single-bus DS18B20 sensor, and the measurement range is -55 to 125 degrees.

4. The hybrid protection circuit of an AC voltage stabilizer power supply according to claim 1, characterized in that: The system voltage measurement circuit is provided with a chip with adjustable output rate, and the 50HZ / 60HZ data output rate is selected according to the working frequency.

5. The hybrid protection circuit of an AC voltage stabilizer power supply according to claim 1, characterized in that: The display signal amplification circuit increases the current of the output signal under the condition that the 5V voltage of the main control MCU circuit remains unchanged.

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