CN205811512U - A kind of power-off control system - Google Patents

Abstract

The utility model relates to the technical field of intelligent electricity consumption monitoring, in particular to a power-off control system. The utility model adopts the single-chip microcomputer control technology method, solves the technical problems of the traditional monitoring system such as single function, achieves the technical effect of intelligent automatic monitoring, meets the technical effect that the voltage rises to the preset value and cuts off the power in time; adopts the voltage transformer The detection voltage technology method of collecting voltage solves the technical problem that the high-voltage signal cannot directly enter the single-chip microcomputer, and achieves the technical effect that the high-voltage signal becomes a low-voltage signal by the voltage transformer first, and then enters the single-chip microcomputer for control; the relay module is adopted The technical method of manual power-off of the button part solves the technical problem that the electrical equipment may be damaged when the electrical equipment is sensitive to some conditions lower than the preset voltage value, and achieves the technology of manual power-off protection circuit Effect.

Description

A power-off control system

technical field

The utility model relates to the technical field of intelligent electricity consumption monitoring, in particular to a power-off control system.

Background technique

With the increase of electricity consumption, the problem of electricity safety has gradually become prominent. In recent years, due to various reasons, fires caused by electricity consumption have emerged one after another, and the research on equipment that automatically cuts off power in time according to the increase in electricity consumption has become an important topic. According to the previous detection and power-off system, the circuit is often only protected by fuses or some fuses, but this method of protecting the circuit is not safe, and some malfunctions may occur due to voltage swells In some cases, doing so will not only affect the use of electric energy, but also cause damage to some voltage-sensitive electrical equipment. Therefore, how to automatically detect voltage and automatically detect the abnormal operation of the circuit according to the increase in voltage? Power failure, and then the protection of the circuit has become an important issue now.

Utility model content

The technical problem to be solved by the utility model is to provide a power-off control system for the above-mentioned technical deficiencies, which uses a single-chip microcomputer control technology to solve the technical problems of the traditional monitoring system such as single function, and achieves intelligent automatic monitoring. When encountering the technical effect that the voltage rises to the preset value and the power is cut off in time; the voltage detection technology method of collecting voltage by the voltage transformer is adopted, which solves the technical problem that the high-voltage signal cannot directly enter the single-chip microcomputer, and achieves the goal of first using the voltage transformer The technical effect of turning the high-voltage signal into a low-voltage signal and then entering the single-chip microcomputer for control; the technical method of manually powering off the button part of the relay module is adopted to solve the problem when the electrical equipment is sensitive to some situations lower than the preset voltage value , The technical problem that may cause damage to these electrical equipment has achieved the technical effect of manual power-off protection circuit.

In order to solve the above-mentioned technical problems, the technical solution adopted in the utility model is: comprise single-chip microcomputer unit, voltage detection unit, relay module and display module; The output port of voltage detection unit is connected with the A/D conversion I/O mouth of single-chip microcomputer unit, The display module is connected with the I/O port of the single-chip unit, the relay module is connected with the I/O port of the single-chip unit, and the power supply module is connected with the power supply I/O port of the single-chip unit.

The main part of the voltage detection unit is a voltage transformer to collect the voltage signal. After coming out of the rectifier bridge D1, it is connected to the capacitor C5 with a capacitance value of 100uF and the electrolytic capacitor C6 with a capacitance value of 1000uF. After coming out of the positive terminal of C6, it is connected to the computing comparator U1. The negative input terminal of C6 is connected to the positive input terminal of U1 and the negative terminal of the power module; at the same time, the positive terminal of C6 is connected to the operational comparator through the resistor R4 with a resistance value of 10K and the capacitor C7 with a capacitance value of 100uF The output terminal is connected, C6 is connected to the output of the operational comparator through a resistor R5 with a resistance value of 100K, the output terminal of U1 is connected to the P34 port of the single-chip unit, and the operational comparator U1 is connected to the power module; the model used for the operational comparator is LM2904 , The voltage transformer is the voltage transformer of DL-PT202D.

To further optimize this technical solution, the single-chip microcomputer unit is a single-chip microcomputer of STC12C5201AD, and the power supply module is a switching power supply of 5V-3A.

Further optimize this technical scheme, the described relay module is the input of the P14 port of the single-chip microcomputer unit, is connected with the power supply module VCC through the resistance R2 with a resistance value of 10K, and the input port P14 of the single-chip microcomputer unit is connected with the resistor R1 with a resistance value of 10K and the triode Q1. The base is connected, the input port P14 of the single-chip unit is connected to the GND of the power module through the button S1; at the same time, the collector of Q1 is connected to the VCC of the power module through the low-voltage coil side of the relay, and the emitter of Q1 is connected to the negative pole of the power module. The relay is Relay for SRD-5VDC-SL-C.

Further optimize this technical scheme, described display module is the liquid crystal display screen of LCD12864; 20 pins and 2 pins of the interface circuit of LCD12864 are connected with the VCC of power supply module, 19 pins and VSS pin of LCD12864 are connected with the VCC of power supply module GND connection, the RST pin of LCD12864 is connected to the P2.1 pin of the single-chip unit, the PSB pin of LCD12864 is connected to the GND of the power module, the E pin of LCD12864 is connected to the P2.0 pin of the single-chip unit, and the RW of LCD12864 The pin is connected to the P1.7 pin of the single-chip unit, the RS (CS) pin of the LCD12864 is connected to the P1.6 pin of the single-chip unit, the V0 pin of the LCD12864 is connected to the sliding side of the 10K displacer R3, and the R3 The other two sides are respectively connected to VCC and GND of the power module.

Compared with the prior art, the utility model has the following advantages:

1. Using STC12C5201AD single-chip microcomputer as the main control unit, it integrates a large-capacity memory and a rich and powerful hardware interface circuit, which has a very high performance-price ratio, and this single-chip microcomputer has its own A/D conversion port, which can convert the collected voltage Converted into digital quantities, and then processed by the single-chip microcomputer;

2. Using the LCD12864 liquid crystal display, the measured voltage can be displayed at any time, and the line voltage can be detected at any time. When the voltage reaches the situation that may damage the circuit, it can be taken in time, which improves the stability, reliability and safety. ;

3. Using LM2904 voltage operation comparison remover, it has good common mode rejection ratio, strong anti-interference ability, strong conversion rate, strong anti-interference ability and strong stability.

Description of drawings

Fig. 1 is a diagram of the internal structure of the utility model;

Fig. 2 is a single-chip microcomputer unit circuit diagram;

Fig. 3 is a circuit diagram of a voltage detection unit;

Fig. 4 is a relay module circuit diagram;

Figure 5 is a display module pin diagram.

In the figure, 1. SCM unit; 2. Power supply module; 3. Voltage detection unit; 4. Relay module; 5. Display module; 6. Voltage transformer; 7. Relay; 8. Button.

detailed description

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and not intended to limit the scope of the present invention. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessarily confusing the concept of the present invention.

Specific embodiment one: as shown in Figure 1-5, comprise single-chip microcomputer unit 1, voltage detection unit 3, relay module 4 and display module 5; The output port of voltage detection unit 3 and the A/D conversion I/O of single-chip microcomputer unit 1 The display module 5 is connected to the I/O port of the single-chip unit 1, the relay module 4 is connected to the I/O port of the single-chip unit 1, and the power supply module 2 is connected to the power supply I/O port of the single-chip unit 1.

The voltage detection unit 3 collects the voltage signal through the voltage transformer 6, and connects to the capacitor C5 with a capacitance value of 100uF and the electrolytic capacitor C6 with a capacitance value of 1000uF after coming out from the rectifier bridge D1, and connects to the computing comparator after coming out from the positive terminal of C6 The negative input terminal of U1, the negative terminal of C6 are connected with the positive input terminal of U1 and the negative terminal of the power module; at the same time, the positive terminal of C6 is connected to the operational comparator through the resistor R4 with a resistance value of 10K and the capacitor C7 with a capacitance value of 100uF C6 is connected to the output terminal of the operational comparator through a resistor R5 with a resistance value of 100K, the output terminal of U1 is connected to the P34 port of the single-chip unit 1, and the operational comparator U1 is connected to the power module 2; the operational comparator uses The model is LM2904, and the voltage transformer 6 is the voltage transformer of DL-PT202D.

Described single-chip microcomputer unit 1 is the single-chip microcomputer of STC12C5201AD, and power supply module 2 is the switching power supply of 5V-3A; Described relay module 4 is the input of single-chip microcomputer unit 1P14 port, is connected with power supply module 2VCC through the resistance R2 of resistance value 10K, single-chip microcomputer The input port P14 of unit 1 is connected to the base of the triode Q1 through the resistor R1 with a resistance value of 10K, and the input port P14 of the single-chip microcomputer unit 1 is connected to the power module 2GND through the button 8S1; at the same time, the collector of Q1 is connected to the low-voltage coil side of the relay 7 It is connected to the VCC of the power module 2, the emitter of Q1 is connected to the negative pole of the power module 2, and the relay 7 is a relay of SRD-5VDC-SL-C; the display module 5 is a liquid crystal display of LCD12864; the interface circuit of LCD12864 The 20 pins and 2 pins of the LCD12864 are connected to the VCC of the power module 2, the 19 pins and the VSS pins of the LCD12864 are connected to the GND of the power module 2, the RST pins of the LCD12864 are connected to the P2.1 pins of the microcontroller unit 1, The PSB pin of LCD12864 is connected to the GND of the power module 2, the E pin of LCD12864 is connected to the P2.0 pin of the microcontroller unit 1, the RW pin of the LCD12864 is connected to the P1.7 pin of the microcontroller unit 1, and the RS The (CS) pin is connected to the P1.6 pin of the microcontroller unit 1, the V0 pin of the LCD12864 is connected to the sliding side of the 10K shifter R3, and the other two sides of R3 are respectively connected to the VCC and GND of the power module 2.

In Fig. 1, the voltage detection unit 3 can collect the voltage signal from the high voltage through the voltage transformer 6, and then enter the single-chip microcomputer through the A/D conversion port of the single-chip microcomputer unit 1, and the single-chip microcomputer unit 1 can monitor the voltage signal at any time, such as If the voltage value is higher than the set voltage value, the single-chip microcomputer unit 1 will give a low-level signal to the triode base of the relay module, the triode will be turned on, the relay will be disconnected, and the circuit will be powered off, thus realizing the protection of the circuit. The display module 5 can display the measured voltage at any time. When the voltage does not meet the voltage value for normal operation, the circuit can be manually disconnected, realizing the double insurance of automatic power-off and manual power-off.

Figure 2 is the circuit structure diagram of MCU unit 1, which uses STC12C5204AD single-chip microcomputer as the main control unit, integrates large-capacity memory and rich and powerful hardware interface circuits, has extremely high performance and price ratio, and has its own A/D conversion port. There is no need to use an additional A/D conversion chip.

It should be understood that the above specific embodiments of the present utility model are only used to illustrate or explain the principle of the present utility model, but not to limit the present utility model. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present utility model shall be included in the protection scope of the present utility model. Furthermore, the appended claims are intended to cover all changes and modifications that come within the scope and boundaries of the appended claims, or equivalents of such scope and boundaries.

Claims (4)

1. a power-off control system, it is characterised in that: include single machine unit, voltage detection unit, relay module and show Show module；The delivery outlet of voltage detection unit is changed I/O mouth with the A/D of single machine unit and is connected, display module and single-chip microcomputer list The I/O mouth of unit connects, and relay module is connected with the I/O mouth of single machine unit, power module and the power supply I/O of single machine unit Mouth connects；

Voltage detection unit gathers voltage signal by voltage transformer, after rectifier bridge D1 is out with capacitance is respectively The capacitor C5 of 100uF and the electrochemical capacitor C6 that capacitance is 1000uF connects, and after C6 anode is out, concatenation operation is compared The negative input of device U1, the negative terminal of C6 is connected with the negative pole of the normal phase input end of U1 and power module；The anode warp of C6 simultaneously Resistance value is that the resistance R4 and the electric capacity C7 that capacitance is 100uF of 10K are connected with the outfan of computing comparator, and C6 is through resistance value Being connected with the outfan of computing comparator for the resistance R5 of 100K, the outfan of U1 is connected with the P34 mouth of single machine unit, computing Comparator U1 is connected with power module；The model that computing comparator uses is LM2904, and voltage transformer is the electricity of DL-PT202D Pressure transformer.

A kind of power-off control system the most according to claim 1, it is characterised in that: single machine unit is STC12C5201AD Single-chip microcomputer, power module is the Switching Power Supply of 5V-3A.

A kind of power-off control system the most according to claim 1, it is characterised in that: relay module is single machine unit P14 mouth inputs, and is connected with power module VCC through the resistance R2 that resistance value is 10K, and the input port P14 of single machine unit is through resistance Value is connected for the base stage of the resistance R1 and audion Q1 of 10K, and the input port P14 of single machine unit is through button S1 and power module GND connects；The colelctor electrode of Q1 is connected with the VCC of power module through the low-voltage coil side of relay simultaneously, the emitter stage of Q1 and electricity The negative pole of source module connects, and relay is the relay of SRD-5VDC-SL-C.

A kind of power-off control system the most according to claim 1, it is characterised in that: display module is the liquid crystal of LCD12864 Display screen；20 pins and 2 pins of the interface circuit of LCD12864 are connected with the VCC of power module, 19 pins of LCD12864 Being connected with the GND of power module with VSS pin, the RST pin of LCD12864 is connected with the P2.1 pin of single machine unit, The PSB pin of LCD12864 is connected with the GND of power module, and the E pin of LCD12864 connects with the P2.0 pin of single machine unit Connecing, the RW pin of LCD12864 is connected with the P1.7 pin of single machine unit, RS (CS) pin of LCD12864 and single-chip microcomputer list Unit P1.6 pin connect, the V0 pin of LCD12864 is connected with the slip side of 10K deflection machine R3, the other both sides of R3 respectively with VCC and GND of power module connects.