CN201369603Y - Intelligent type dual-power switching circuit - Google Patents

Abstract

The utility model relates to a power supply control circuit system, in particular to an intelligent dual power supply switching circuit with a microcontroller. The intelligent dual power supply switching circuit of the utility model includes a main power supply monitoring module, a backup power supply monitoring module, a comparison module, a control module, a power supply module and the like. The control module is a single-chip microcomputer control circuit; the comparison module is connected to an analog switch and then input to the single-chip microcomputer control circuit. The main power supply monitoring module and the standby power supply monitoring module are three-phase phase voltage monitoring modules. The control module is also connected with a display module, a button module and an LED indicating module. The control module is also connected with a communication module. The utility model adopts the above technical scheme, and has the advantages of intelligently controlling switching, providing a good man-machine exchange interface and communication management.

Description

Intelligent dual power switching circuit

technical field

The utility model relates to a power supply control circuit system, in particular to an intelligent dual power supply switching circuit with a microcontroller.

Background technique

With the development of my country's national economy and the improvement of people's living standards, people have higher and higher requirements for the safety, continuity and reliability of electricity consumption, especially in high-rise buildings, shopping malls, banks, hospitals, post and telecommunications, coal mine ships, Industrial assembly lines, civil air defense, chemical industry, metallurgy, and military facilities and other important places that do not allow power outages require reliable power guarantees. The dual power supply switching control device system is designed to meet this requirement. It has functions such as power failure alarm, power supply operating status detection, and automatic switching between two power supplies to prevent the faulty power supply from supplying power to the load and ensure the safety of the load. Avoid direct economic losses such as equipment damage and other indirect economic losses caused by power failures. However, the conventional dual power switching control device system only realizes dual power switching, and generally uses logic gate circuits instead of microprocessors for intelligent control, so it cannot provide a good man-machine exchange interface and communication management functions.

Utility model content

In order to solve the above problems, the utility model provides a circuit system with a micro-processing chip for intelligent control of dual power supply switching management.

The utility model is achieved through the following technical solutions:

The intelligent dual power supply switching circuit of the present invention includes a main power supply monitoring module, a backup power supply monitoring module, a comparison module, a control module, a power supply module, etc., the control module is a single-chip microcomputer control circuit; the comparison module is connected to an analog switch Then input to the single-chip microcomputer control circuit, the comparison module is a voltage comparison isolation circuit composed of an optocoupler and a voltage comparator, and the control module is also connected with a display module, a button module, and an LED indicator module.

Further, the comparison module is a voltage comparison isolation circuit composed of an optocoupler and a voltage comparator.

Further, the main power supply monitoring module and the standby power supply monitoring module are three-phase phase voltage monitoring modules.

Further, the control module is also connected with a communication module. The communication module is an RS485 communication module.

Further, the power module is composed of a bridge rectifier circuit and a power chip.

Further, the power chip is 7805.

The utility model adopts the above technical scheme, and has the advantages of intelligently controlling switching, providing a good man-machine exchange interface and communication management.

Description of drawings

Fig. 1 is a circuit module connection diagram of the present utility model;

Fig. 2 is a schematic circuit diagram of the preferred embodiment of the utility model.

Detailed ways

The utility model is further described in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the intelligent dual power supply switching circuit of the present invention includes a main power supply monitoring module, a standby power supply monitoring module, a comparison module, a control module, a power supply module and the like. The control module is a single-chip microcomputer control circuit; the comparison module is connected to an analog switch and then input to the single-chip microcomputer control circuit. The main power supply monitoring module and the standby power supply monitoring module are three-phase phase voltage monitoring modules. The control module is also connected with a display module, a button module and an LED indicator module. The control module is also connected with a communication module.

As shown in Figure 2, when the main power supply or backup power supply 380V is connected, the main power supply uses the voltage transformer LA, voltage transformer LB, voltage transformer LC to collect the corresponding AC voltage, and the backup power supply is from the voltage transformer L1, The voltage transformer L2 and voltage transformer L3 collect the corresponding AC voltage, and the voltage transformer outputs at a ratio of 100:1. Assume that the voltage transformer LA of the main power supply inputs AC200V AC voltage, and the secondary output voltage is AC2.2V. D1 half-wave rectification, capacitor C1, capacitor C4 filter, resistor R1 current limiting, resistor R2 voltage divider, adjust the resistance of resistor R2, adjust the voltage ratio output, through resistor R3 current limiting input to the second pin of comparator U7, by the resistor The setting composed of R4, resistor R5, and resistor R6 is used as the inverting input terminal of the comparator U7. When the potential of the second pin of the comparator U7 is higher than the potential of the third pin of the comparator U7, the comparator U7 will output a high level. Input to the 13th pin of the analog switch U3, output from the 3rd pin, add to the 24th pin of the single-chip microcomputer U1, change from the original high level to low level, and continuously detect through the internal logic judgment of the single-chip microcomputer U1, so the voltage of the main power supply is judged The transformer LA phase voltage is too high, and the single-chip microcomputer U1 is divided into six outputs at the same time. The first route is the 36-pin, 37-pin, 38-pin, and 39-pin parallel output of the single-chip microcomputer U1, which drives the LCD display chip U4 to make the LCD display "main power LA phase". voltage too high". In the second route, the 35th pin of the single-chip microcomputer U1 is converted from the original low level to the high level to make LED1 go out. In the saturated state, the relay J2 is released, and the power-off device is also released at the same time. Indicates that the main power failure device disconnects the main power supply and is about to switch to the backup power supply. The fourth route is the 36-pin, 37-pin, 38-pin, 39-pin parallel output of the single-chip microcomputer U1 to drive the LCD display chip U4 to make the LCD display screen display the words "backup power supply". The fifth route is that the 21st pin of the single-chip microcomputer U1 is converted from the original high level to the low level through the resistor R27 to limit the current and divide the voltage to make the LED3 light up, indicating the start-up instruction of the backup power supply. The third route is the 27th pin of the single-chip microcomputer U1. The flat output becomes low level output, the triode T2 enters the cut-off state from the original full state, and the relay J2 is pulled in, and the backup power device is also connected to the load power supply, and the backup power supply starts to supply power. Power supply, in case of overvoltage in any phase, automatic conversion can be realized. The working principles of other voltage transformers LB, voltage transformer LC, voltage transformer L1, voltage transformer L2, and voltage transformer L3 are the same, and will not be repeated here.

When there is no voltage output from any phase secondary of voltage transformer LA, voltage transformer LB, and voltage transformer LC, it means that there may be a phase failure or a power failure, and it should be switched to another power supply. When diode D1, diode D2, and diode D3 have voltage When outputting, three different detection optocoupler circuits are composed of resistor 1R1, optocoupler 1U1, resistor 1R2, optocoupler 1U2, resistor 1R3, and optocoupler 1U3, and optocoupler 1U1, optocoupler 1U2, and optocoupler 1U3 are all on-off State, the output is low level, respectively input to the 2nd and 4th pins of the analog switch U3, switch the output through the 3rd pin of the analog switch U3, input to the 24th pin I/O of the single-chip microcomputer U1, and judge by the internal logic of the single-chip microcomputer U1 , which will be divided into six outputs to drive the corresponding circuits, and the specific driving method is the same as above.

When one of the 13th, 14th, and 15th pins of the analog switch U3 is at a low level, and when one of the 12th, 1st, and 5th pins of the analog switch U3 is at a low level, and both occur simultaneously, the microcontroller U1 The 27th pin and 28th pin will output high level and at the same time the triode T1 and triode T2 are in a saturated state, so that the relay J1 and relay J2 are released, and the common and standby power supply disconnection devices trip and cut off the power to ensure the safety of the power supply.

The remote display operation control circuit of the utility model is a serial communication interface circuit chip U2 (75176 integrated chip) which is a differential bus transceiver, and the transceiver is a monolithic integrated circuit for bidirectional data communication on a balanced transmission line. When the 5th and 8th pins of the microcontroller U1 and the serial communication interface circuit chip U2 form a serial data input terminal and a transmission output terminal, a high and low level converter is formed.

The power supply circuit of the utility model is a bridge rectifier circuit composed of diodes 2D1-2D4, which is filtered by capacitor 2C1 and capacitor 2C2 at high and low frequencies, and input to the first pin of the power supply chip U5, and then output 5V from the third pin through internal voltage stabilization. The DC voltage, through the high-frequency and low-frequency filtering of the capacitor 2C3 and the capacitor 2C4, provides the utility model with a DC working voltage of +5V.

Although the utility model has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that, without departing from the spirit and scope of the utility model defined by the appended claims, changes in form and details may be made. Making various changes to the utility model is within the protection scope of the utility model.

Claims (5)

1. the intelligent duplicate power supply commutation circuit comprises main power source monitoring modular, stand-by power supply monitoring modular, comparison module, control module, power module etc., and it is characterized in that: described control module is a single chip machine controlling circuit; Described comparison module inputs to described single chip machine controlling circuit after connecting analog switch, the voltage ratio that described comparison module is made up of optocoupler and voltage comparator is than buffer circuit, and described control module also is connected with display module, key-press module, LED indicating module.

2. intelligent duplicate power supply commutation circuit as claimed in claim 1 is characterized in that: described main power source monitoring modular and stand-by power supply monitoring modular are the three-phase phase voltage monitoring modulars.

3. intelligent duplicate power supply commutation circuit as claimed in claim 1 is characterized in that: described control module also is connected with communication module, and described communication module is the RS485 communication module.

4. electric leakage fire alarm protection system as claimed in claim 1 is characterized in that: described power module is that bridge rectifier and power supply chip are formed.

5. electric leakage fire alarm protection system as claimed in claim 4, it is characterized in that: described power supply chip is 7805.

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