Dual power supply switching device

Abstract

The utility model provides a dual power supply switching device, comprising a power supply bus and a load bus, the power supply bus comprises a first power supply bus and a second power supply bus, and the first power supply bus and the second power supply bus are both electrically connected with the load bus and supply power to the load bus. The utility model further discloses a switch unit, an interlocking module, a driving unit and a control unit. According to the utility model, when the first power supply bus is disconnected, the second power supply bus is connected, so that in practical application, when the first power supply bus breaks down, the second power supply bus used as an auxiliary device can automatically supply power to load equipment, the effect of timely power supply is achieved, the load equipment can be prevented from being damaged due to power failure, and the service life of the load equipment is prolonged. When the first power supply bus is repaired, the second power supply bus is automatically disconnected, manual operation is not needed, power supply is automatically and rapidly switched, use is convenient, high practicability is achieved, and continuous power supply of load equipment is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of dual power supply, in particular to a dual power switching device. Background Art

[0002] Power supply is the process of providing electrical energy to a device, system or building. It is achieved by transferring electricity from the grid, generator, battery or other power source to the target device or system. Generally, single power supply or dual power supply can be used. When a single power supply is cut off, its recovery speed depends on the repair speed and is used on low-pressure load devices. Dual power supply can provide backup power and achieve rapid power recovery, which is used on high-pressure load devices.

[0003] A dual power supply system and semiconductor production equipment provided by the publication number CN207853556U, the dual power supply system includes: a main power supply device for providing alternating current; a main power supply for converting the alternating current provided by the main power supply device to power the load; a backup power supply for converting the alternating current provided by the main power supply device to power the load; an automatic switching switch for realizing the electrical connection between the main power supply device and the main power supply or realizing the electrical connection between the main power supply device and the backup power supply through self-switching, the automatic switching switch includes a switch, and the switch is connected to the main power supply device, the main power supply and the backup power supply. The dual power supply system of the utility model can switch to the backup power supply to supply power to the load when the main power supply fails by setting the main power supply and the backup power supply at the same time, so as to ensure that the load can still work normally when the main power supply fails. When the main power supply is powered off, the backup power supply needs to be started by the control module, and the power recovery time depends on the response speed of the control module. The slow power recovery speed affects the load equipment, causing the load equipment to be powered off or damaged. Utility Model Content

[0004] The purpose of the utility model is to provide a dual power switching device to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A dual power switching device includes a power supply bus and a load bus, wherein the power supply bus includes a first power supply bus and a second power supply bus, wherein the first power supply bus and the second power supply bus are both electrically connected to the load bus and supply power to the load bus, and further includes:

[0007] A switch unit, the switch unit comprising a first switch unit and a second switch unit based on IGBT, the first switch unit being connected in series between a first power supply bus and a load bus, and used to control the on and off of power supply from the first power supply bus to the load bus, and the second switch unit being connected in series between a second power supply bus and a load bus, and used to control the on and off of power supply from the second power supply bus to the load bus;

[0008] An interlocking module, the interlocking module comprising a group of intermediate relays, a first switch relay and a second switch relay, the intermediate relay having a group of coils K, a normally closed contact KN and a group of normally open contacts KM, the first switch relay having a coil 1K, a normally closed contact 1KN and a group of normally open contacts 1KM, and the second switch relay having a coil 2K, a normally closed contact 2KN and a group of normally open contacts 2KM;

[0009] A driving unit, wherein the driving unit is electrically connected to the first switch unit and the second switch unit, and is respectively used to drive the first switch unit and the second switch unit to conduct, a normally open contact 1KM is connected in series on the connection circuit between the driving unit and the first switch unit, and a normally open contact 2KM is connected in series on the connection circuit between the driving unit and the second switch unit, and the normally open contact 1KM and the normally open contact 2KM are respectively used to control the on and off of the driving signals of the first switch unit and the second switch unit;

[0010] A control unit, the control unit is electrically connected to the driving unit and is used to send a control signal to make the driving unit send a turn-on signal of the IGBT;

[0011] The two ends of the coil K are electrically connected between the live wire and the neutral wire of the first power supply bus, respectively; the coil 1K, the normally closed contact 2KN and the normally open contact KM are sequentially connected in series and then connected in parallel to the two ends of the coil K; the normally closed contact KN, the normally closed contact 1KN and the coil 2K are sequentially connected in series, and the two ends are electrically connected to the live wire and the neutral wire of the second power supply bus, respectively;

[0012] Furthermore, the control unit is electrically connected to a load parameter acquisition module, which includes a voltage transmitter and a current transmitter. The primary side of the voltage transmitter and the current transmitter is electrically connected to the live wire of the load bus, and the secondary side is electrically connected to the control unit, and is respectively used to collect voltage and current data of the load bus and send them to the control unit.

[0013] Furthermore, the dual power switching device also includes a voltage compensation module, which includes a DC energy storage device, which is used to store DC power. The DC energy storage device is electrically connected to the DC input terminal of the inverter, and the AC output terminal of the inverter is electrically connected to the secondary side of the transformer. The inverter is also electrically connected to the control unit and is used to convert DC power into AC power under the control of the control unit. The primary side of the transformer is connected in series to the load bus to compensate for the voltage of the load bus.

[0014] Furthermore, a fuse FU1 and a fuse FU2 are respectively connected in series on the live wires of the first power supply bus and the second power supply bus.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model forms an interlocking module through the first switch relay, the second switch relay and the intermediate relay, so that when the first power supply bus is turned on, the second power supply bus is automatically disconnected; when the first power supply bus is disconnected, the second power supply bus is turned on. Therefore, in actual application, when the first power supply bus fails, the second power supply bus used as an auxiliary can automatically supply power to the load equipment, which has the effect of timely power supply and can also prevent the load equipment from being damaged due to power failure. When the first power supply bus is repaired, the second power supply bus is automatically disconnected without manual operation, and the power supply is automatically and quickly switched. It is easy to use and has strong practicality, and the continuous power supply of the load equipment is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall circuit structure of the utility model.

[0018] In the figure: 10, switch unit; 11, first switch unit; 12, second switch unit; 20, interlocking module; 30, drive unit; 40, control unit; 50, load parameter acquisition module; 51, voltage transmitter; 52, current transmitter; 60, voltage compensation module; 61, DC energy storage device; 62, inverter; 63, transformer; 70, power supply bus; 71, first power supply bus; 72, second power supply bus; 80, load bus. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Example:

[0021] See also Figure 1 , the utility model provides a technical solution:

[0022] A dual power switching device includes a power supply bus 70 and a load bus 80, wherein the power supply bus 70 includes a first power supply bus 71 and a second power supply bus 72, wherein the first power supply bus 71 and the second power supply bus 72 are both used to supply power to a load device, wherein the first power supply bus 71 is a main power supply line, and the second power supply bus 72 is an auxiliary power supply line, wherein the first power supply bus 71 and the second power supply bus 72 are both electrically connected to the load bus 80 and supply power to the load bus 80, and further includes a switch unit 10, an interlocking module 20, a drive unit 30 and a control unit 40, wherein:

[0023] The switch unit 10 includes a first switch unit 11 and a second switch unit 12 based on IGBT. The IGBT is composed of a pnp bipolar transistor and an npn MOSFET. When a voltage is applied to the control terminal of the transistor, the flow of current can be controlled, thereby realizing the switch function. Compared with a general contact switch, the switch based on IGBT has the characteristic of fast response speed. The first switch unit 11 is connected in series between the first power supply bus 71 and the load bus 80, and is used to control the on-off of the first power supply bus 71 supplying power to the load bus 80. The second switch unit 12 is connected in series between the second power supply bus 72 and the load bus 80, and is used to control the on-off of the second power supply bus 72 supplying power to the load bus 80.

[0024] The interlocking module 20 includes a group of intermediate relays, a first switch relay and a second switch relay. The intermediate relay has a group of coils K, a normally closed contact KN and a group of normally open contacts KM. When the coil K of the intermediate relay is powered off, the normally closed contact KN is closed and the normally open contact KM is disconnected. When the coil K of the intermediate relay is powered on, the normally closed contact KN is disconnected and the normally open contact KM is closed. The first switch relay has a coil 1K, a normally closed contact 1KN and a group of normally open contacts 1KM. When the coil 1K of the first switch relay is powered off, the normally closed contact 1KN is closed and the normally open contact 1KM is disconnected. When the coil 1K of the first switch relay is powered on, the normally closed contact 1KN is disconnected and the normally open contact 1KM is closed. The second switch relay has a coil 2K, a normally closed contact 2KN and a group of normally open contacts 2KM. When the coil 2K of the second switch relay is powered off, the normally closed contact 2KN is closed and the normally open contact 2KM is opened. When the coil 2K of the first switch relay is powered on, the normally closed contact 2KN is opened and the normally open contact 2KM is closed.

[0025] The driving unit 30 is electrically connected to the first switch unit 11 and the second switch unit 12, and is used to drive the first switch unit 11 and the second switch unit 12 to conduct respectively. The driving unit 30 is used to control and drive the first switch unit 11 and the second switch unit 12 based on IGBT, and can provide appropriate voltage and current signals to ensure the rapid response of the first switch unit 11 and the second switch unit 12 during the opening and closing process, and to maintain stability and reliability during operation. A normally open contact 1KM is connected in series on the connection circuit between the driving unit 30 and the first switch unit 11, and a normally open contact 2KM is connected in series on the connection circuit between the driving unit 30 and the second switch unit 12. The normally open contact 1KM and the normally open contact 2KM are used to control the on and off of the drive signals of the first switch unit 11 and the second switch unit 12 respectively;

[0026] The control unit 40 is electrically connected to the drive unit 30 and is used to send a control signal to make the drive unit 30 send an IGBT conduction signal. The control unit 40 is a circuit or module responsible for controlling the switch state of the IGBT. It usually includes a logic circuit for generating a control signal of the IGBT as needed. The control unit 40 can control the conduction and shutdown of the IGBT according to an external control signal, such as a PWM (pulse width modulation) signal or other instructions.

[0027] The driving unit 30 is used to provide appropriate voltage and current signals to drive the IGBT. It is responsible for converting the control signal generated by the control unit 40 into the appropriate level and current required by the IGBT. The driving unit 30 includes a power supply circuit for providing power to the logic circuit and the output stage, and a driving circuit for amplifying and converting the signal of the logic circuit into the driving signal required by the IGBT. The driving unit 30 always sends a driving signal to the first switch unit 11 and the second switch unit 12.

[0028] The two ends of the coil K are electrically connected between the live wire and the neutral wire of the first power supply bus 71, respectively. The coil 1K, the normally closed contact 2KN and the normally open contact KM are sequentially connected in series and then connected in parallel to the two ends of the coil K. After the normally closed contact KN, the normally closed contact 1KN and the coil 2K are sequentially connected in series, the two ends are electrically connected to the live wire and the neutral wire of the second power supply bus 72, respectively.

[0029] The control unit 40 is electrically connected to a load parameter acquisition module 50, and the load parameter acquisition module 50 includes a voltage transmitter 51 and a current transmitter 52. The primary side of the voltage transmitter 51 and the current transmitter 52 are electrically connected to the live wire of the load bus 80, and the secondary side is electrically connected to the control unit 40. The voltage transmitter 51 is a device that converts the measured voltage into a linearly proportional output voltage and isolates the output analog signal or digital signal. The current transmitter 52 is a device that converts the measured current into a linearly proportional output current and isolates the output analog signal or digital signal. The voltage transmitter 51 and the current transmitter 52 are respectively used to collect the voltage and current data of the load bus 80 and send them to the control unit 40.

[0030] When the dual power supply is switched, the actual voltage of the first power supply bus 71 and the second power supply bus 72 may be different, resulting in a sudden change in voltage of the load bus 80. The sudden change in voltage may cause damage to the load equipment, especially for sensitive electronic equipment, which may cause equipment damage or functional failure. Therefore, the dual power supply switching device of the utility model also includes a voltage compensation module 60, the voltage compensation module 60 includes a DC energy storage device 61, the DC energy storage device 61 is used to store DC power, the DC energy storage device 61 is electrically connected to the DC input end of the inverter 62, the AC output end of the inverter 62 is electrically connected to the secondary side of the transformer 63, and the inverter 62 is also electrically connected to the control unit 40, for converting DC power into AC power under the control of the control unit 40, and the primary side of the transformer 63 is connected in series to the load bus 80, for providing a compensation voltage to the load bus 80 to prevent the voltage of the load bus 80 from changing suddenly.

[0031] A fuse FU1 and a fuse FU2 are respectively connected in series to the live wires of the first power supply bus 71 and the second power supply bus 72. The fuse FU1 and the fuse FU2 are respectively used to protect the circuits of the first power supply bus 71 and the second power supply bus 72.

[0032] In this embodiment, the first switch unit 11 and the second switch unit 12 are IGBT-based switches, whose model is IR 4BC30S product based on IR company, which can provide fast response and efficient switching functions. The drive unit 30 adopts the drive circuit module of IR company with model IR2136, and the control unit 40 is composed of a development board based on model Ardu ino UNO R3.

[0033] The voltage transmitter 51 uses a voltage sensor of model ZMPT101 B, and the current transmitter 52 uses a current sensor of model ACS712, which can convert the measured voltage and current into corresponding analog signals for transmission and collection.

[0034] The DC energy storage device 61 is used to store DC power, and can use a capacitor with parameters of 4700uF and 100V, or a lithium battery pack with parameters of 3.7V and 18650. The inverter 62 is a device that converts DC power into AC power. The inverter model is KSG-300W. The transformer 63 is used to provide a compensation voltage for the load bus 80, and an EE13 type transformer is used.

[0035] The use principle of this utility model:

[0036] First, it is clear that coil K, normally closed contact KN and normally open contact KM constitute an intermediate relay; coil 1K, normally closed contact 1KN and normally open contact 1KM constitute a first switch relay; coil 2K, normally closed contact 2KN and normally open contact 2KM constitute a second switch relay. When the first power supply bus 71 is energized, coil K is in the energized state, normally closed contact KN is disconnected, coil 2K is in the de-energized state, so normally open contact 2KM is in the disconnected state, and the second power supply bus 72 is in the disconnected state, at this time, the first power supply bus 71 is the only power supply; when the first power supply bus 71 fails due to external reasons and is disconnected, coil K is in the de-energized state, at this time the normally open contact KM is disconnected, the normally open contact 1KM is disconnected, coil 1K is de-energized, normally closed contact KN is closed, normally closed contact 1KN is closed, and normally closed contact 1KM is closed. When the first power supply bus 71 resumes power supply, the coil K is in the power-on state, the normally open contact KM is closed, the normally closed contact KN is disconnected, the coil 2K is in the power-off state, the normally open contact 2KM is disconnected, the second power supply bus 72 is automatically disconnected, the normally closed contact 2KN is in the closed state, the coil 1K is in the power-on state, the normally open contact 1KM is closed, and the first power supply bus 71 is powered normally. In short, the interlocking module 20 is composed of the first switch relay, the second switch relay and the intermediate relay, which automatically disconnects the second power supply bus 72 when the first power supply bus 71 is turned on; when the first power supply bus 71 is disconnected, the second power supply bus 72 is turned on. Therefore, in actual application, when the first power supply bus 71 fails, the second power supply bus 72 used as an auxiliary can supply power to the load equipment. When the first power supply bus 71 is repaired, the second power supply bus 72 is automatically disconnected. No manual operation is required, it is easy to use and has strong practicality.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dual power switching device, comprising a power supply bus (70) and a load bus (80), wherein the power supply bus (70) comprises a first power supply bus (71) and a second power supply bus (72), wherein the first power supply bus (71) and the second power supply bus (72) are both electrically connected to the load bus (80) and supply power to the load bus (80), characterized in that: Also included are: A switch unit (10), the switch unit (10) comprising a first switch unit (11) and a second switch unit (12) based on IGBT, the first switch unit (11) being connected in series between a first power supply bus (71) and a load bus (80) for controlling the on and off of power supplied from the first power supply bus (71) to the load bus (80), and the second switch unit (12) being connected in series between a second power supply bus (72) and the load bus (80) for controlling the on and off of power supplied from the second power supply bus (72) to the load bus (80); An interlocking module (20), the interlocking module (20) comprising a group of intermediate relays, a first switch relay and a second switch relay, the intermediate relay having a group of coils K, a normally closed contact KN and a group of normally open contacts KM, the first switch relay having a coil 1K, a normally closed contact 1KN and a group of normally open contacts 1KM, and the second switch relay having a coil 2K, a normally closed contact 2KN and a group of normally open contacts 2KM; A drive unit (30), the drive unit (30) being electrically connected to the first switch unit (11) and the second switch unit (12), and being respectively used to drive the first switch unit (11) and the second switch unit (12) to conduct, the normally open contact 1KM being connected in series to a connection circuit between the drive unit (30) and the first switch unit (11), the normally open contact 2KM being connected in series to a connection circuit between the drive unit (30) and the second switch unit (12), and the normally open contact 1KM and the normally open contact 2KM being used to control the on and off of drive signals of the first switch unit (11) and the second switch unit (12); A control unit (40), the control unit (40) being electrically connected to the drive unit (30) and used for sending a control signal so that the drive unit (30) sends a conduction signal of the IGBT; The two ends of the coil K are respectively electrically connected between the live wire and the neutral wire of the first power supply bus (71); the coil 1K, the normally closed contact 2KN and the normally open contact KM are sequentially connected in series and then connected in parallel at the two ends of the coil K; after the normally closed contact KN, the normally closed contact 1KN and the coil 2K are sequentially connected in series, the two ends are respectively electrically connected to the live wire and the neutral wire of the second power supply bus (72).

2. A dual power switching device according to claim 1, characterized in that: The control unit (40) is electrically connected to a load parameter acquisition module (50), and the load parameter acquisition module (50) comprises a voltage transmitter (51) and a current transmitter (52), wherein the primary side of the voltage transmitter (51) and the current transmitter (52) are electrically connected to the live wire of the load bus (80), and the secondary side is electrically connected to the control unit (40), and is used to respectively acquire voltage and current data of the load bus (80) and send the data to the control unit (40).

3. A dual power switching device according to claim 2, characterized in that: The dual power switching device also includes a voltage compensation module (60), the voltage compensation module (60) includes a DC energy storage device (61), the DC energy storage device (61) is used to store DC electric energy, the DC energy storage device (61) is electrically connected to the DC input end of the inverter (62), the AC output end of the inverter (62) is electrically connected to the secondary side of the transformer (63), and the inverter (62) is also electrically connected to the control unit (40) for converting DC power into AC power under the control of the control unit (40), and the primary side of the transformer (63) is connected in series to the load bus (80) for compensating the voltage of the load bus (80).

4. A dual power switching device according to claim 1, characterized in that: A fuse FU1 and a fuse FU2 are respectively connected in series to the live wires of the first power supply bus (71) and the second power supply bus (72).

Images