CN112671090A

CN112671090A - Program-controlled double-circuit AC power supply automatic switching device

Info

Publication number: CN112671090A
Application number: CN202011612950.1A
Authority: CN
Inventors: 俞奕; 王之鸿; 凌昇; 路秋妮; 贾佑群
Original assignee: Suzhou Industrial Park Kejia Automation Co ltd
Current assignee: Suzhou Industrial Park Kejia Automation Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-04-16

Abstract

The invention relates to a program-controlled two-way alternating current power supply automatic switching device, which comprises a case, wherein the case consists of a front panel, a case shell and a rear panel, the front panel is assembled on the front side of the case shell, the rear panel is assembled on the rear side of the case shell, a left mounting sheet is arranged on the left side of the front panel, a right mounting sheet is arranged on the right side of the front panel, a button is arranged on the middle surface of the front panel, and a plurality of power output sockets are arranged in the middle and on the left side of the rear panel; the control circuit board and the automatic switching circuit which takes the single chip microcomputer as a core are arranged in the case. The invention relates to a program-controlled double-circuit alternating current power supply automatic switching device, which adopts a control circuit with a single chip microcomputer as a core, controls the automatic switching of a double-circuit power supply by programming, and can realize the safe, quick and reliable switching between the double-circuit alternating current power supply by quickly sampling the state of an input power supply and accurately setting the switching time of the double-circuit power supply.

Description

Program-controlled double-circuit AC power supply automatic switching device

Technical Field

The invention relates to the field of power distribution of communication machine rooms, in particular to a program-controlled double-circuit automatic switching device for an alternating-current power supply.

Background

In the power utilization occasions of some more important equipment, the power supply can not be interrupted, so that at least two paths of input power supplies are needed to ensure power supply, one path of power supply is used as a main power supply to preferentially output power to a load, and the other path of power supply is used as a standby power supply to automatically switch output power supply when the main power supply is powered off; when the main power supply recovers the incoming call, the standby power supply automatically quits the power supply, and the main power supply is automatically switched to provide power for the power utilization load; for the switching between two power supplies, if the two-way input is a direct current power supply, the output can be connected together in parallel after simple isolation, and the output power supply is basically not interrupted during switching; for the double-path input, an alternating current power supply is adopted, and the output of the double-path power supply cannot be connected in parallel after being isolated due to different phases and time sequences among the power supplies, so that a switching control circuit is needed; the complex zero-crossing discrimination dual-power switching control circuit can be similar to seamless switching, but the switching device is expensive in price, large in size and serious in heating; generally, for electric equipment with not high requirement on the continuity of power supply, the requirement can be met by adopting non-zero-crossing-judging electromagnetic devices and the like to perform double-circuit power supply switching; however, the adoption of the alternating-current dual-power-supply switching circuit with non-zero-crossing judgment generally cannot well grasp the control of the switching time, the two alternating-current power supplies conflict together when the switching time is too fast, and the normal work of the power load is influenced when the switching time is too slow.

Disclosure of Invention

In order to solve the technical problems, the invention provides a program-controlled double-circuit alternating current power supply automatic switching device, which adopts a low-cost double-circuit alternating current power supply switching control circuit with a single chip microcomputer as a core, and accurately sets the interval time of power-off switching, power-on switching and priority setting switching of the double-circuit alternating current power supply by programming a switching control program, thereby not only preventing the inter-phase line arc discharge collision possibly caused by the over-fast non-zero-passage switching circuit, but also ensuring that the instantaneous power-off interval in the switching process cannot be too slow and the electric equipment can normally work.

The technical scheme adopted by the invention for solving the technical problems is as follows: a program-controlled double-circuit alternating current power supply automatic switching device comprises a case, wherein the case consists of a front panel, a case shell and a rear panel, the front panel is assembled on the front side of the case shell, the rear panel is assembled on the rear side of the case shell, a left side mounting piece is installed on the left side of the front panel, a right side mounting piece is installed on the right side of the front panel, a setting button is arranged on the middle surface of the front panel, an A-way priority indicator lamp is arranged on the left side of the setting button, and a B-way priority indicator lamp is arranged on the right side of the setting button; an A-path input lamp is embedded above the left side of the front panel, an A-path connecting lamp is embedded on the right side of the A-path input lamp, and the A-path input lamp and the A-path connecting lamp on the front panel are connected through a white line segment symbol; a B-path input lamp is embedded below the A-path input lamp, a B-path connecting lamp is embedded on the right side of the B-path input lamp, and the B-path input lamp and the B-path connecting lamp on the front panel are connected by a white line segment symbol; an output indicator lamp is embedded in the middle position of the right side of the A-path connecting lamp and the B-path connecting lamp, and the A-path connecting lamp and the B-path connecting lamp are connected with a white arrow line symbol pointing to the output indicator lamp on the front panel respectively; the right side of the rear panel is provided with an A-way power supply inlet wire penetrating into the case, and the A-way power supply inlet wire is connected with an A-way input plug; a B-path power supply inlet wire penetrating into the case is arranged on the left side of the A-path power supply inlet wire, and a B-path input plug is connected to the B-path power supply inlet wire; the line A power supply incoming line comprises a live wire L1 and a zero wire N1 of the line A power supply, and the line B power supply incoming line comprises a live wire L2 and a zero wire N2 of the line B power supply; eight power output sockets are uniformly arranged on the left side of the B-path power inlet wire on the rear panel; the control circuit board is provided with a double-circuit power supply automatic switching circuit and a double-circuit power supply automatic switching device which take the main control single chip microcomputer as a core.

A main control single chip microcomputer, a low-voltage direct-current source, a driving single selection circuit, an indicator lamp controller, an A-path conversion power supply, a B-path conversion power supply, an A-path sampler, a B-path sampler, an A-path driver and a B-path driver are preferably arranged on a control circuit board in the case; the main control single chip microcomputer is provided with an A-path input sampling port, a B-path input sampling port, an output switching control port, a light control driving port, a power supply input port and a priority sampling port.

Preferably, the A-path switching controller comprises a JA control coil and a two-path JA-1 normally open contact, and the B-path switching controller comprises a JB control coil and a two-path JB-1 normally open contact; the A-path driver comprises a control coil J1 and a normally open contact J1-1, the B-path driver comprises a control coil J2 and a normally open contact J2-1, the upper ends of the control coil J1 and the control coil J2 are negative electrodes, and the lower ends of the control coil J1 and the control coil J2 are positive electrodes; the lower part of the drive single selection circuit comprises input ends IN1 and IN2, and the upper part of the drive single selection circuit comprises output ends OUT1 and OUT 2. Preferably, an A-path input sampling port of the master control singlechip is connected with the output end of the A-path sampler, and a B-path input sampling port of the master control singlechip is connected with the output end of the B-path sampler; the output switching control port of the master control singlechip is connected with IN1 and IN2 ends of the driving single selection circuit, and the light control driving port is connected with the indicator lamp controller; the priority sampling port of the master control singlechip is connected with a button electrode arranged on the front panel; and a power supply input port of the master control singlechip is connected with an output end of the low-voltage direct current source.

Preferably, the output end of OUT1 of the drive single selection circuit is connected with the positive pole of a control coil J1 of the A-way driver, and the output end of OUT2 is connected with the positive pole of a control coil J2 of the B-way driver; the negative electrodes of the control coil J1 of the A-path driver and the control coil J2 of the B-path driver are connected and then connected with the output ground of the low-voltage direct current source; the normally open contact J1-1 of the A-way driver is connected in series in a zero line N1 loop of the A-way power supply incoming line at the lower end of a JA control coil, and the normally open contact of the B-way driver is connected in series in a zero line N2 loop of the B-way power supply incoming line at the lower end of a JB control coil; the upper end of the A-path switching controller JA control coil is connected with a live wire L1 of the A-path power supply incoming line, and the upper end of the B-path switching controller coil is connected with a live wire L2 of the B-path power supply incoming line.

Preferably, L1 and N1 of the incoming line of the A-path power supply are respectively connected with the input end of the A-path conversion power supply, the input end of the A-path sampler and the upper side of a double-path normally-open contact JA-1 of the A-path switching controller, and L2 and N2 of the incoming line of the B-path power supply are respectively connected with the input end of the B-path conversion power supply, the input end of the B-path sampler and the upper side of a double-path normally-open contact JB-1 of the; the lower side of the double-path normally open contact JA-1 of the circuit A switching controller and the lower side of the double-path normally open contact JB-1 of the circuit B switching controller are respectively combined and then connected with an electrode of a power output socket; the output end of the A-path conversion power supply and the output end of the B-path conversion power supply are respectively connected with the input end of a low-voltage direct current source, and the output end of the low-voltage direct current source provides power for the main control single chip microcomputer and other circuits.

Preferably, the indicator light controller is connected with electrodes of a path A priority indicator light, a path B priority indicator light, a path A input light, a path A connecting light, a path B input light, a path B connecting light and an output indicator light on the left side in the middle of the front panel.

Preferably, the left side mounting piece of the front panel left side assembly is provided with three oval left side mounting holes from top to bottom, and the right side mounting piece of the front panel right side assembly is provided with three oval right side mounting holes from top to bottom.

Preferably, the incoming line of the power supply in the circuit A and the incoming line of the power supply in the circuit B are wound and then are fastened and fixed at two ends by two strapping tapes.

The invention has the beneficial effects that: the program-controlled double-circuit alternating current power supply automatic switching device adopts the double-circuit alternating current power supply automatic switching control circuit which takes the single chip microcomputer as the core, saves the cost and reduces the volume of the device compared with the traditional zero crossing point judging switching circuit, and can ensure the stable work of most data communication systems and computer control equipment power supplies on the basis of slightly prolonging the double-circuit alternating current switching time.

Drawings

Fig. 1 is a schematic structural diagram of an external shape of an automatic switching device of a program-controlled two-way ac power supply according to an embodiment;

fig. 2 is a circuit block diagram of a control board of the automatic switching device of the program-controlled two-way ac power supply according to the embodiment;

fig. 3 is a schematic diagram of single-selection logic of an automatic switching device of a program-controlled two-way ac power supply according to an embodiment;

wherein: 1-front panel, 1a-A channel input lamp, 1B-A channel connection lamp, 1c-B channel input lamp, 1d-B channel connection lamp, 1 e-output indicator lamp, 1f-A channel priority lamp, 1g-B channel priority lamp, 1 h-setting button, 2-case shell, 3-rear panel, 3 a-rear plate fixing screw, 4-left side mounting plate, 4 a-left side fixing hole, 5-right side mounting plate, 5 a-right side fixing hole, 6-control circuit board, 6 a-main control singlechip, 6a1-A channel input sampling port, 6a2-B channel input sampling port, 6a 3-output switching control port, 6a 4-light control driving port, 6a 5-power supply input port, 6a 6-priority sampling port, 6B-low voltage direct current source, 6 c-drive single selection circuit, 6 d-indicator lamp controller, 6e-A path conversion power supply, 6f-B path conversion power supply, 6g-A path sampler, 6h-B path sampler, 6i-A path driver, 6j-B path driver, 7-A path power supply inlet wire, 8-A path input plug, 9-B path power supply inlet wire, 10-B path input plug, 11-output power supply socket, 12-strapping tape, 13-A path switching controller and 14-B path switching controller.

Detailed Description

For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.

Examples

Fig. 1 is a schematic diagram of an external structure of an automatic switching device for a program-controlled two-way ac power supply according to this embodiment; a program-controlled two-way AC power supply automatic switching device comprises a case, wherein the case consists of a front panel 1, a case shell 2 and a rear panel 3, the front panel 1 is assembled on the front side of the case shell 2, the rear panel 3 is assembled on the rear side of the case shell 2, and the case is a 19-inch standard 1U case and is suitable for being installed in a power distribution and communication cabinet of a communication machine room; the left side of the front panel 1 is provided with a left side mounting piece 4, the right side of the front panel 1 is provided with a right side mounting piece 5, the left side mounting piece assembled on the left side of the front panel 1 is provided with three oval left side mounting holes 4a from top to bottom, the right side mounting piece assembled on the right side of the front panel 1 is provided with three oval right side mounting holes 5a from top to bottom, and the sizes and center spacing hole positions of the oval mounting holes are matched with the vertical bars in the communication cabinet and used for mounting and fixing the whole case of the invention; a setting button 1h is arranged on the middle surface of the front panel 1, an A-way priority indicator lamp 1f is arranged on the left side of the setting button 1h, and a B-way priority indicator lamp 1g is arranged on the right side of the setting button 1 h; the setting button 1h is a one-way button with a lock, when the setting button 1h is pressed, the right-side B-way priority indicator lamp 1g lights up green light, and when the setting button 1h is popped up, the left-side A-way priority indicator lamp 1f lights up green light; an A-way input lamp 1a is embedded above the left side of the front panel 1, an A-way turn-on lamp 1b is embedded on the right side of the A-way input lamp 1a, and the A-way input lamp 1a and the A-way turn-on lamp 1b on the front panel 1 are connected through a white line segment symbol; a B-path input lamp 1c is embedded below the A-path input lamp 1a, a B-path switch-on lamp 1d is embedded on the right side of the B-path input lamp 1c, and the B-path input lamp 1c and the B-path switch-on lamp 1d on the front panel 1 are connected through a white line segment symbol; an output indicator lamp 1e is embedded in the middle position of the right side of the A-way connection lamp 1B and the B-way connection lamp 1d, the A-way connection lamp 1B and the B-way connection lamp 1d are connected with a white arrow line symbol pointing to the output indicator lamp 1e on the front panel 1 respectively, and the white line segments and the arrows are used for indicating the power supply state and direction of a two-way alternating current power supply; when the incoming line of the power supply of the A path is electrified, the corresponding input lamp of the A path is lightened to emit red light, when the incoming line of the power supply of the B path is electrified, the corresponding input lamp of the B path is lightened to emit red light, when the incoming line of the power supply of the A path is connected with the through lamp to lighten the green lamp, the power supply of the A path is represented to be supplied to the output, when the incoming line of the B path is connected with the through lamp to lighten the green lamp, the power supply of the B path is represented to be supplied to the output, and when the output indicator lamp is lightened; A. when the B double-path input is in any state, only one path supplies power to the output, and the two paths of power supplies cannot supply power to the output at the same time, namely the A path connecting lamp and the B path connecting lamp cannot be simultaneously lightened; the right side of the rear panel is provided with an A-way power supply inlet wire penetrating into the case, and an A-way input plug 8 is connected to the A-way power supply inlet wire 7; a B-path power inlet wire 9 penetrating into the case is arranged on the left side of the A-path power inlet wire 7, a B-path input plug 10 is connected to the B-path power inlet wire 9, and the A-path power inlet wire 7 and the B-path power inlet wire 9 are wound and then are fastened and fixed at two ends by two strapping tapes 12; the A-way power supply incoming line 7 comprises a live line L1 and a zero line N1 of the A-way power supply, and the B-way power supply incoming line 9 comprises a live line L2 and a zero line N2 of the B-way power supply; eight power output sockets 11 are uniformly arranged on the left side of the B-path power inlet wire 9 on the rear panel 3; the power sockets provide uninterrupted power for external electric load equipment; the lower edge of the rear panel is provided with four rear plate fixing screws 3a for fixing the rear panel and the case shell; the control circuit board 6, the A-path switching controller 13 and the B-path switching controller 14 are arranged in the case and used for switching control output of a two-path alternating current input power supply.

Fig. 2 is a circuit diagram of a control board of the automatic switching device for a program-controlled two-way ac power supply according to the present embodiment; the control circuit board 6 in the case is provided with a main control single chip microcomputer 6a, a low-voltage direct current source 6B, a driving single selection circuit 6c, an indicator lamp controller 6d, a path A conversion power supply 6e, a path B conversion power supply 6f, a path A sampler 6g, a path B sampler 6h, a path A driver 6i and a path B driver 6j, and the two paths are connected together through circuit wiring; the main control single chip microcomputer 6a is provided with an A-path input sampling port 6a1, a B-path input sampling port 6a2, an output switching control port 6a3, a lamplight control driving port 6a4, a power supply input port 6a5 and a priority sampling port 6a6, and is used for controlling input and output; the A-path switching controller 13 comprises a JA control coil and a two-path JA-1 normally open contact, the B-path switching controller 14 comprises a JB control coil and a two-path JB-1 normally open contact, and the JA control coil and the JB control coil control the closing of JA-1 and JB-1 when the AC power supply is switched on; the A-way driver 6i comprises a control coil J1 and a normally open contact J1-1, the B-way driver 6J comprises a control coil J2 and a normally open contact J2-1, the upper ends of the control coil J1 and the control coil J2 are negative electrodes, and the lower ends of the control coil J1 and the control coil J2 are positive electrodes; both can be controlled by a direct current voltage signal to close J1-1 and J2-1; the lower part of the drive single selection circuit 6c comprises input ends IN1 and IN2, and the upper part of the drive single selection circuit 6c comprises output ends OUT1 and OUT 2; the output switching control port 6a3 of the master control singlechip 6a is connected with the IN1 and IN2 ends of the driving single-selection circuit 6c, and the lamplight control driving port 6a4 is connected with the indicator light controller 6 d; the priority sampling port 6a6 of the master control singlechip 6a is connected with a setting button 1h electrode on the front panel 1; the power supply input port 6a5 of the master control singlechip 6a is connected with the output end of the low-voltage direct current source 6 b; the indicator lamp controller 6d is connected with the electrodes of the A-path priority indicator lamp, the B-path priority indicator lamp in the middle of the front panel 1 and the left electrodes of the A-path input lamp, the A-path connecting lamp, the B-path input lamp, the B-path connecting lamp and the output indicator lamp, and drives the indicator lamps to be turned on or turned off according to signals sent by the main control single chip microcomputer; the output end of OUT1 of the drive unit selection circuit 6c is connected with the positive electrode of a control coil J1 of the A-path driver 6i, and the output end of OUT2 is connected with the positive electrode of a control coil J2 of the B-path driver; the negative electrodes of the control coil J1 of the A-way driver 6i and the control coil J2 of the B-way driver 6J are connected and then connected with the output ground of the low-voltage direct current source; the normally open contact J1-1 of the A-way driver 6J is connected in series in a zero line N1 loop of the A-way power supply incoming line at the lower end of the JA control coil, and the normally open contact of the B-way driver 6J is connected in series in a zero line N2 loop of the B-way power supply incoming line at the lower end of the JB control coil; the upper end of the coil of the A-path switching controller 13JA is connected with a live wire L1 of the incoming line of the A-path power supply, and the upper end of the coil of the B-path switching controller 14 is connected with a live wire L2 of the incoming line of the B-path power supply; the L1 and the N1 of the A power supply incoming line 7 are respectively connected with the input end of the A conversion power supply, the input end of the A sampler and the upper side of a double-path normally open contact JA-1 of the A switching controller, and the L2 and the N2 of the B power supply incoming line 9 are respectively connected with the input end of the B conversion power supply, the input end of the B sampler and the upper side of a double-path normally open contact JB-1 of the B switching controller; the lower side of the two-way normally open contact JA-1 of the circuit A switching controller 13 and the lower side of the two-way normally open contact JB-1 of the circuit B switching controller 14 are respectively combined and then connected with the electrode of the power output socket; the output end of the A-path conversion power supply and the output end of the B-path conversion power supply are respectively connected with the input end of a low-voltage direct current source, and the output end of the low-voltage direct current source provides power for the main control single chip microcomputer and other circuits.

As shown in fig. 2, the whole circuit of this embodiment operates as follows: the main control single chip microcomputer executes a program according to the requirement of double-circuit power supply switching control, and after starting, if the incoming line of the power supply A and the incoming line of the power supply B are both electrified, the converted power supply A and the converted power supply B are respectively supplied to a low-voltage direct current source and are separated and merged into one circuit, and the low-voltage direct current power supply is supplied to the main control single chip microcomputer on the main control circuit board and each circuit; if only one of the A-path power inlet wire and the B-path power inlet wire is electrified, one of the A-path conversion power supply and the B-path conversion power supply must work, and the converted low-voltage direct-current power supply can be maintained to work by the main control circuit board; after the master control single chip microcomputer starts to work, firstly reading power input signals of the A path and the B path provided by the A path sampler and the B path sampler through the A path sampling port and the B path sampling port, then reading a priority setting signal provided by a setting button through the priority sampling port, and sending a control signal to the drive single selection circuit through the output switching control port after judging; if the master control singlechip samples that both the A path and the B path have power supplies and sets the A path as priority, the master control singlechip sends OUT a driving signal IN1 with high level and IN2 with low level, the driving single selection circuit sends OUT OUT1 with high level and OUT2 with low level, so that the J1-1 contact is attracted and the J2-1 contact is released, further the coil of the A path switching controller JA is connected with the power supply, the coil of the B path switching controller JB is not connected with the power supply, the JA-1 double-path contact is connected and the JB-1 double-path contact is disconnected, thus the power supply inlet wire of the A path supplies power to the output power supply socket through JA-1, and the power supply inlet wire and the output of the B path are disconnected; if the master control singlechip samples that both the A path and the B path have power supplies and sets the B path as priority, the master control singlechip sends OUT a drive signal IN1 with low level and IN2 with high level, the drive single selection circuit sends OUT OUT1 with low level and OUT2 with high level, so that a J1-1 contact is released and a J2-1 contact is attracted, a coil of a JB switch controller JB of the B path is connected with the power supply, and a coil of a JA switch controller of the A path is not connected with the power supply, at the moment, a JB-1 two-way contact is connected and a JA-1 two-way contact is disconnected, and thus, the incoming line of the B path power supply supplies power to an output power supply socket through JB-1, and the incoming line and the output of the A; if the main control single chip microcomputer samples that the power supply of the path A and the power supply of the path B are powered on and the power supply of the path A is powered off, the main control single chip microcomputer does not judge the priority, the path with power is immediately switched on and output, and when the path with power loss recovers to be powered on, the main control single chip microcomputer correspondingly switches on the input power supply of the priority to output power supply after judging the priority setting.

Fig. 3 is a schematic diagram showing the single selection logic of the automatic switching device for program-controlled two-way ac power supply according to this embodiment; the two input ends IN1 and IN2 and the two output ends OUT1 and OUT2 of the driving single selection circuit IN the figure have corresponding logical relations, and the state relations of the input and the output are represented by 0 and 1 IN the table, wherein 0 represents low level and the earth equipotential of the low-voltage direct current source, and 1 represents high level and the anode equipotential of the low-voltage direct current source; as can be seen from the table, the IN1 and IN2 combined arrangement at the input end of the driving single-selection circuit has four different states from "00" to "11", and the corresponding output ends OUT1 and OUT2 only have two states of "10" or "01", so that the requirement that the output is not allowed to have the "11" state is met, namely two paths of input power supplies cannot be driven to be connected with a power output socket at the same time; if the double-path alternating current power supply is two single-phase power supplies which are separated from a zero-sharing three-phase power supply, 380V voltage exists between two single-phase live wires, and when the double-path alternating current power supply is switched, arc-out short circuit between the double-path power supplies possibly occurs in a controller, and overcurrent tripping of an input power supply can be caused; the driving single-selection circuit is formed by overlapping 'gate circuits', and the single-selection output level is very stable and reliable; if the driving single selection circuit is not adopted and the main control single chip microcomputer is directly adopted to output the driving signal, when the main control single chip microcomputer is electrified and started, a program is not executed, or when the main control single chip microcomputer is in a 'dead halt', the single chip microcomputer executes the program out of control, the driving output end can be in a '1' state, and therefore the danger that the power supply is switched and the output is switched on can occur.

The invention relates to a program-controlled double-path alternating current power supply automatic switching device, which adopts a control circuit with a single chip as a core, controls the automatic switching of a double-path power supply by programming, can carry out the quick switching and then output of the double-path alternating current input power supply by quickly sampling the state of the input power supply and reading the priority setting of the input power supply, can accurately set the switching time of the double-path power supply, prevents the switching conflict between zero-sharing double-path alternating current power supplies, realizes the safe, quick and reliable switching between the double-path alternating current power supplies, and ensures the reliable operation of important electric equipment.

The above embodiments should not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent transformations fall within the protection scope of the present invention.

Claims

1. The utility model provides a programme-controlled double-circuit alternating current power supply automatic switching control equipment which characterized in that: the intelligent cabinet comprises a cabinet, wherein the cabinet consists of a front panel (1), a cabinet shell (2) and a rear panel (3), the front panel (1) is assembled on the front side of the cabinet shell (2), the rear panel (3) is assembled on the rear side of the cabinet shell (2), a left mounting sheet (4) is installed on the left side of the front panel (1), a right mounting sheet (5) is installed on the right side of the front panel (1), a setting button (1h) is arranged on the middle surface of the front panel (1), an A-way priority indicator lamp (1f) is arranged on the left side of the setting button (1h), and a B-way priority indicator lamp (1g) is arranged on the right side of the setting button (1 h); an A-way input lamp (1a) is embedded above the left side of the front panel (1), an A-way turn-on lamp (1b) is embedded on the right side of the A-way input lamp (1a), and the A-way input lamp (1a) and the A-way turn-on lamp (1b) on the front panel (1) are connected through a white line segment symbol; a B-path input lamp (1c) is embedded below the A-path input lamp (1a), a B-path switch-on lamp (1d) is embedded on the right side of the B-path input lamp (1c), and the B-path input lamp (1c) and the B-path switch-on lamp (1d) on the front panel (1) are connected through a white line segment symbol; an output indicator lamp (1e) is embedded in the middle position of the right side of the A-way connecting lamp (1B) and the B-way connecting lamp (1d), and the A-way connecting lamp (1B) and the B-way connecting lamp (1d) are connected with a white arrow line symbol pointing to the output indicator lamp (1e) on the front panel (1) respectively; the right side of the rear panel is provided with an A-way power supply inlet wire penetrating into the case, and an A-way input plug (8) is connected to the A-way power supply inlet wire (7); a B-path power supply inlet wire (9) penetrating into the case is arranged on the left side of the A-path power supply inlet wire (7), and a B-path input plug (10) is connected to the B-path power supply inlet wire (9); the A-way power supply incoming line (7) comprises a live wire L1 and a zero wire N1 of the A-way power supply, and the B-way power supply incoming line (9) comprises a live wire L2 and a zero wire N2 of the B-way power supply; eight power output sockets (11) are uniformly arranged on the left side of the B-path power inlet wire (9) on the rear panel (3); the control circuit board (6), the A-path switching controller (13) and the B-path switching controller (14) are arranged in the case, and the control circuit board (6) is provided with a double-path power supply automatic switching circuit and a double-path power supply automatic switching device which take the main control single chip microcomputer as a core.

2. The automatic switching device of a program-controlled two-way alternating current power supply according to claim 1, characterized in that: a main control single chip microcomputer (6a), a low-voltage direct current source (6B), a driving single selection circuit (6c), an indicator lamp controller (6d), an A-path conversion power supply (6e), a B-path conversion power supply (6f), an A-path sampler (6g), a B-path sampler (6h), an A-path driver (6i) and a B-path driver (6j) are arranged on a control circuit board (6) in the case; the main control single chip microcomputer (6a) is provided with an A-path input sampling port (6a1), a B-path input sampling port (6a2), an output switching control port (6a3), a light control driving port (6a4), a power supply input port (6a5) and a priority sampling port (6a 6).

3. The automatic switching device of a program-controlled two-way alternating current power supply according to claim 1, characterized in that: the A-path switching controller (13) comprises a JA control coil and a two-path JA-1 normally open contact, and the B-path switching controller (14) comprises a JB control coil and a two-path JB-1 normally open contact; the A-way driver (6i) comprises a control coil J1 and a normally open contact J1-1, the B-way driver (6J) comprises a control coil J2 and a normally open contact J2-1, the upper ends of the control coil J1 and the control coil J2 are negative electrodes, and the lower ends of the control coil J1 and the control coil J2 are positive electrodes; the lower part of the drive single selection circuit (6c) comprises input ends IN1 and IN2, and the upper part of the drive single selection circuit (6c) comprises output ends OUT1 and OUT 2.

4. The automatic switching device of a program-controlled two-way alternating current power supply according to claim 2, characterized in that: the A-path input sampling port (6a1) of the master control singlechip (6a) is connected with the output end of the A-path sampler, and the B-path input sampling port (6a2) is connected with the output end of the B-path sampler; the output switching control port (6a3) of the master control singlechip (6a) is connected with the IN1 and IN2 ends of the driving single-selection circuit (6c), and the lamplight control driving port (6a4) is connected with the indicator lamp controller (6 d); the priority sampling port (6a6) of the master control singlechip (6a) is connected with the electrode of a setting button (1h) on the front panel (1); and a power supply input port (6a5) of the master control singlechip (6a) is connected with an output end of the low-voltage direct current source (6 b).

5. The automatic switching device of a program-controlled two-way alternating current power supply according to claim 2, characterized in that: the output end of OUT1 of the drive single selection circuit (6c) is connected with the positive electrode of a control coil J1 of the A-way driver (6i), and the output end of OUT2 is connected with the positive electrode of a control coil J2 of the B-way driver; the negative electrodes of the control coil J1 of the A-path driver (6i) and the control coil J2 of the B-path driver (6J) are connected and then connected with the output ground of the low-voltage direct current source; the normally open contact J1-1 of the A-way driver (6J) is connected in series in a zero line N1 loop of the A-way power supply incoming line at the lower end of the JA control coil, and the normally open contact of the B-way driver (6J) is connected in series in a zero line N2 loop of the B-way power supply incoming line at the lower end of the JB control coil; the upper end of the JA control coil of the A-path switching controller (13) is connected with a live wire L1 of the incoming line of the A-path power supply, and the upper end of the coil of the B-path switching controller (14) is connected with a live wire L2 of the incoming line of the B-path power supply.

6. The automatic switching device of a program-controlled two-way alternating current power supply according to claim 1, characterized in that: the L1 and the N1 of the A power supply incoming line (7) are respectively connected with the input end of the A conversion power supply, the input end of the A sampler and the upper side of a two-way normally open contact JA-1 of the A switching controller, and the L2 and the N2 of the B power supply incoming line (9) are respectively connected with the input end of the B conversion power supply, the input end of the B sampler and the upper side of a two-way normally open contact JB-1 of the B switching controller; the lower side of the double-path normally open contact JA-1 of the circuit A switching controller (13) and the lower side of the double-path normally open contact JB-1 of the circuit B switching controller (14) are respectively combined and then connected with an electrode of a power output socket; the output end of the A-path conversion power supply and the output end of the B-path conversion power supply are respectively connected with the input end of a low-voltage direct current source, and the output end of the low-voltage direct current source provides power for the main control single chip microcomputer and other circuits.

7. The automatic switching device of a program-controlled two-way alternating current power supply according to claim 2, characterized in that: the indicator lamp controller (6d) is connected with the electrodes of the A-path priority indicator lamp, the B-path priority indicator lamp in the middle of the front panel (1), the A-path input lamp, the A-path connecting lamp, the B-path input lamp, the B-path connecting lamp and the output indicator lamp on the left side.

8. The automatic switching device of a program-controlled two-way alternating current power supply according to claim 1, characterized in that: the left side installation piece of front panel (1) left side assembly is equipped with three oval left side mounting hole (4a) from the top down, be equipped with three oval right side mounting hole (5a) from the top down on the right side installation piece of front panel (1 right side assembly).

9. The automatic switching device of a program-controlled two-way alternating current power supply according to claim 1, characterized in that: the A-path power supply incoming line (7) and the B-path power supply incoming line (9) are wound and then are fastened and fixed at two ends by two strapping tapes (12).