CN203445685U - New microcomputer protection switching power supply plug-in - Google Patents

Abstract

The utility model relates to a novel power plug-in unit for a microcomputer protection switch. The novel power plug-in unit comprises a circuit main board; the circuit main board is provided with a switch power supply main module and a switch power supply standby module for transforming AC to required DC for output; the output terminal of the switch power supply main module and the output terminal of the switch power supply standby module are electrically connected with a base plate pin; the circuit main board is also provided with a supervision switching module; the supervision switching module is electrically connected with the switch power supply main module and the switch power supply standby module; and when the output voltage of the switch power supply main module is lower than the voltage set by the supervision switching module, the supervision switching module enables the output voltage of the switch power supply main module to be switched off, the switch power supply standby module is switched on, and the switch power supply standby module outputs the required voltage through the base plate pin. According to the novel power plug-in unit, the structure is simple and compact, usage costs are low, replacement and maintenance are convenient, and the security and reliability of electrical network power supply are effectively raised.

Description

New microcomputer protection switching power supply plug-in

technical field

The utility model relates to a plug-in structure, in particular to a novel microcomputer protection switching power supply plug-in, which belongs to the technical field of electric power system relay protection.

Background technique

Microcomputer protection switches are widely used in power grids. They have the functions of fault discrimination and outlet tripping. When various faults occur in the power grid, microcomputer protection functions as fault discrimination, removal, and isolation of faults, which are the basis for safe operation of the power grid. Because the microcomputer protection switching power supply is easy to be damaged suddenly after working for 5~8 years. The existing microcomputer-protected switching power supply plug-in does not include redundant power supply modules. Once the switching power supply module is damaged, the microcomputer protection will lose power and cannot work normally. At this time, the power grid will be in an unprotected operating state, which has great potential safety hazards.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies in the prior art and provide a new type of microcomputer protection switching power supply plug-in, which has a simple and compact structure, low cost of use, easy replacement and maintenance, and can effectively improve the safety and reliability of power grid power supply.

According to the technical solution provided by the utility model, the new microcomputer protection switching power supply plug-in includes a circuit main board, and the circuit main board is provided with a switching power supply main module and a switching power supply backup module for converting alternating current into required direct current output. The output end of the switching power supply main module and the output end of the switching power supply backup module are electrically connected to the bottom plate pins, and a monitoring switching module is also arranged on the circuit board, and the monitoring switching module is electrically connected with the switching power supply main module and the switching power supply backup module; When the output voltage of the switching power supply main module is lower than the voltage value set by the monitoring switching module, the monitoring switching module turns off the output voltage of the switching power supply main module, and starts the switching power supply backup module, so that the switching power supply backup module outputs all required voltage value.

The main board of the circuit is provided with connecting terminals, and the connecting terminals are electrically connected with the input end of the switching power supply main module and the input end of the switching power supply standby module, and the input terminal of the switching power supply main module and the switching power supply standby module are connected to the external Input power electrical connection.

One end of the circuit board is provided with a back baffle.

The monitoring switching module includes a first operational amplifier, the non-inverting terminal of the first operational amplifier is connected with one end of the first resistor, one end of the second resistor and one end of the third resistor, and the other end of the first resistor is connected with the voltage Ui , the other end of the second resistor is grounded, the other end of the third resistor is connected to the anode end of the first diode, the cathode end of the first diode is connected to the output end of the first operational amplifier and one end of the fourth resistor, The other end of the fourth resistor is connected to the voltage VCC; the output terminal of the first operational amplifier is connected to the control terminal of the switching power supply main module and the inverting terminal of the second operational amplifier; the inverting terminal of the first operational amplifier is connected to the voltage UR and the second operational amplifier. Connect one end of the five resistors;

The other end of the fifth resistor is connected to the non-inverting end of the second operational amplifier and one end of the sixth resistor, the other end of the sixth resistor is connected to the anode end of the second diode, and the cathode end of the second diode is connected to the second The output end of the operational amplifier is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to the voltage VCC, and the output end of the second operational amplifier is connected to the control end of the switching power supply backup module.

Both the first operational amplifier and the second operational amplifier use LM393. Several fixing screws are arranged on the back baffle.

Both the switching power supply main module and the switching power supply backup module output voltages of 5V and 24V. When the monitoring switching module cuts off the output voltage of the switching power supply main module, it outputs alarm information.

The utility model has the advantages: a modular switching power supply main module and a switching power supply backup module are arranged on the main board of the circuit, which is convenient for installation and maintenance, and the monitoring switching module monitors and monitors the output voltage value of the switching power supply main module. In case of failure, the monitoring switching module shuts off the output of the main module of the switching power supply, and starts the backup module of the switching power supply to output the required voltage value through the backup module of the switching power supply to ensure the reliability of the protection operation of the microcomputer. The structure is simple and compact, and the cost of use is low. .

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic circuit diagram of the monitoring switching module of the present invention.

Explanation of reference signs: 1-switching power supply main module, 2-switching power supply backup module, 3-monitoring switching module, 4-bottom plate pin, 5-fixing screw, 6-connecting terminal, 7-back baffle and 8- Circuit board.

Detailed ways

Below in conjunction with specific accompanying drawing and embodiment the utility model is further described.

As shown in Figure 1: in order to improve the effectiveness and reliability of microcomputer protection, the utility model includes a circuit board 8, and the circuit board 8 is provided with a switching power supply main module 1 for converting alternating current into required direct current output and Switching power supply backup module 2, the output end of the switching power supply main module 1 and the output end of the switching power supply backup module 2 are electrically connected to the bottom plate pin 4, and a monitoring switching module 3 is also set on the circuit main board 8, and the monitoring switching module 3 It is electrically connected with the switching power supply main module 1 and the switching power supply backup module 2; when the output voltage of the switching power supply main module 1 is lower than the voltage value set by the monitoring switching module 3, the monitoring switching module 3 turns off the output voltage of the switching power supply main module 1 , and start the switching power supply backup module 2, so that the switching power supply backup module 2 outputs the required voltage value through the pin 4 of the backplane.

Specifically, in the embodiment of the present utility model, the switching power supply main module 1 and the switching power supply backup module 2 arranged on the circuit board 8 can all adopt conventional flyback low-power power electronic switching power supplies, the switching power supply main module 1, the switching power supply The backup module 2 can convert the input voltage into 5V and/or 24V direct current, and the switching power supply main module 1 and the switching power supply backup module 2 output corresponding voltage values through the bottom pin 4 on the circuit board 8 to provide corresponding Working power. During normal operation, the switching power supply main module 1 works and supplies power. When the voltage value output by the switching power supply main module 1 is lower than the voltage value set by the monitoring switching module 3, the monitoring switching module 3 turns off the output terminal of the switching power supply main module 1. , and start the switching power supply backup module 2, output the corresponding 5V and/or 24V voltage through the switching power supply backup module 2, and ensure the continuity and reliability of the power supply through the switching power supply backup module 2. The backplane pin 4 is responsible for connecting the output of the switching power supply main module 1 or the switching voltage backup module 2 to the motherboard bus to provide power for other plug-ins.

In the embodiment of the present invention, the bottom plate pin 4 is located at one end of the circuit board 8, and the other end of the circuit board 8 is provided with a connection terminal 6, which is connected to an external 220V voltage through the connection terminal 6. Specifically, the connection terminal 6 is electrically connected to the input end of the switching power supply main module 1 and the input end of the switching power supply backup module 2, and the input terminal of the switching power supply main module 1 and the switching power supply backup module 2 are connected to the external input terminal 6 Power supply electrical connections. The switching power supply main module 1 and the switching power supply backup module 2 convert the voltage input by the external power supply to 5V and 24V voltages.

One end of the circuit main board 8 is provided with a back baffle 7 . The back baffle 7 and the connection terminal 6 are located at the same end of the circuit main board 8, and the back baffle 7 is provided with several fixing screws 5, through which the circuit main board 8 can be fixedly mounted on the chassis easily. Further, in the embodiment of the present utility model, when the monitoring switching module 3 shuts off the output voltage of the switching power supply main module 1, the alarm information is output to the outside through the connection terminal 6, and the alarm information prompts the switching power supply main module 1 damage.

As shown in Figure 2: the monitoring switching module 3 includes a first operational amplifier A, the non-inverting terminal of the first operational amplifier A is connected to one end of the first resistor R1, one end of the second resistor R2 and one end of the third resistor R3 The other end of the first resistor R1 is connected to the voltage Ui, the other end of the second resistor R2 is connected to the ground, the other end of the third resistor R3 is connected to the anode of the first diode D1, and the cathode of the first diode D1 The terminal is connected to the output terminal of the first operational amplifier A and one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the voltage VCC; the output terminal of the first operational amplifier A is connected to the control terminal of the switching power supply main module 1 and the second terminal of the fourth resistor R4 The inverting terminal of the second operational amplifier B is connected; the inverting terminal of the first operational amplifier A is connected with the voltage UR and one end of the fifth resistor R5;

The other end of the fifth resistor R5 is connected to the non-inverting end of the second operational amplifier B and one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the anode end of the second diode D2, and the second diode D2 The cathode terminal of the second operational amplifier B is connected to the output terminal of the seventh resistor R7, the other end of the seventh resistor R7 is connected to the voltage VCC, the output terminal of the second operational amplifier B is connected to the control terminal of the switching power supply backup module 2 connect.

Specifically, the first operational amplifier A and the second operational amplifier B both use LM393. The voltage Ui is the voltage value output by the main module 1 of the switching power supply, and the voltage UR is the output reference voltage of the first operational amplifier A and the second operational amplifier B. One power supply terminal of the first operational amplifier A is connected to the voltage VCC, and the other terminal voltage terminal is grounded. The output terminal of the first operational amplifier A is connected to the control terminal of the switching power supply main module 1, and the output terminal of the second operational amplifier B is connected to the switching power supply. Connect to the control terminal of standby module 2.

The monitoring and switching module 3 monitors the output 24V and 5V of the switching power supply main module 1, and when 24V drops to 22.8 or 5V drops to 4.75V, the output terminal of the switching power supply main module 1 is blocked through the output terminal of the first operational amplifier A, and simultaneously passes The second operational amplifier B turns on the switching power supply backup module 2 to ensure that the switching power supply plug-in can continuously supply power.

Modular switching power supply main module 1 and switching power supply backup module 2 are arranged on the circuit board 8 of the utility model, which is convenient for installation and maintenance. When the output voltage fails, the monitoring switching module 3 shuts off the output of the switching power supply main module 1, and starts the switching power supply backup module 2, so as to output the required voltage value through the switching power supply backup module 2 to ensure the reliability of the microcomputer protection operation. The structure is simple and compact, and the use cost is low.

Claims (8)

1. A new microcomputer protection switching power supply plug-in, characterized in that it includes a circuit board (8), and the circuit board (8) is provided with a switching power supply main module (1) and a switch for converting alternating current into required direct current output The power supply backup module (2), the output end of the switching power supply main module (1) and the output end of the switching power supply backup module (2) are electrically connected to the bottom plate pins (4), and the circuit board (8) is also provided with a monitoring switch module (3), the monitoring switching module (3) is electrically connected to the switching power supply main module (1) and the switching power supply backup module (2); when the output voltage of the switching power supply main module (1) is lower than the monitoring switching module (3 ) at the set voltage value, monitor the switching module (3) to turn off the output voltage of the switching power supply main module (1), and start the switching power supply backup module (2), so that the switching power supply backup module (2) passes through the backplane pin ( 4) Output the required voltage value. 2. The new microcomputer protection switching power supply plug-in according to claim 1, characterized in that: the circuit board (8) is provided with a connecting terminal (6), and the connecting terminal (6) is connected to the switching power supply main module (1 ) and the input end of the switching power supply backup module (2), and the input terminal of the switching power supply main module (1) and the switching power supply backup module (2) are electrically connected to the external input power supply through the terminal (6). 3. The new microcomputer protection switching power supply plug-in according to claim 1, characterized in that: one end of the circuit main board (8) is provided with a rear baffle (7). 4. The new microcomputer protection switching power supply plug-in according to claim 1, characterized in that: the monitoring switching module (3) includes a first operational amplifier (A), and the non-inverting terminal of the first operational amplifier (A) is connected to One end of the first resistor (R1), one end of the second resistor (R2) and one end of the third resistor (R3) are connected, the other end of the first resistor (R1) is connected to the voltage Ui, and the other end of the second resistor (R2) One end is grounded, the other end of the third resistor (R3) is connected to the anode end of the first diode (D1), the cathode end of the first diode (D1) is connected to the output end of the first operational amplifier (A) and the first One end of the four resistors (R4) is connected, and the other end of the fourth resistor (R4) is connected to the voltage VCC; the output terminal of the first operational amplifier (A) is connected to the control terminal of the switching power supply main module (1) and the second operational amplifier ( The inverting terminal of B) is connected; the inverting terminal of the first operational amplifier (A) is connected to the voltage UR and one end of the fifth resistor (R5); The other end of the fifth resistor (R5) is connected to the non-inverting end of the second operational amplifier (B) and one end of the sixth resistor (R6), and the other end of the sixth resistor (R6) is connected to the second diode (D2) The anode end is connected, the cathode end of the second diode (D2) is connected to the output end of the second operational amplifier (B) and one end of the seventh resistor (R7), and the other end of the seventh resistor (R7) is connected to the voltage VCC , the output terminal of the second operational amplifier (B) is connected to the control terminal of the switching power supply backup module (2). 5. The new microcomputer protection switching power supply plug-in according to claim 4, characterized in that: the first operational amplifier (A) and the second operational amplifier (B) both use LM393. 6. The new microcomputer protection switching power supply plug-in according to claim 3, characterized in that: there are several fixing screws (5) on the back baffle (7). 7. The new microcomputer-protected switching power supply plug-in according to claim 1, characterized in that: the switching power supply main module (1) and the switching power supply backup module (2) both output voltages of 5V and 24V. 8. The new microcomputer-protected switching power supply plug-in according to claim 1, characterized in that: the monitoring switching module (3) outputs an alarm message when the output voltage of the switching power supply main module (1) is turned off.

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