Time sequence control power supply conversion device, method and system

Abstract

The invention provides a time sequence control power supply conversion device, method and system, and belongs to the technical field of power supply and distribution. In the device, the coil negative end of a first power supply contactor is grounded through an auxiliary contact of a relay, the coil positive end is connected with a power supply module, and a bus bar is connected with an external first alternating current power supply through a main contact of a second power supply contactor; the bus bar is connected with an external second alternating current power supply through a main contact of the first power supply contactor; an auxiliary contact of the first power contactor controls a coil negative end of the second power contactor, a coil negative end of the relay is normally connected, and a coil positive end of the first power contactor normally supplies power; according to the invention, the circuit is simplified, the conversion time is shortened, the conversion logic is not preferentially limited, and the conversion time and the bidirectional conversion function equivalent to those of a single AC conversion contactor can be realized; power supply faults and damages caused by arc discharge during power supply conversion of a single AC conversion contactor or two AC power supply contactors can be safely and reliably prevented.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply and distribution, and in particular relates to a timing controlled power conversion device, method and system. Background Art

[0002] Priority-based aircraft dual-redundant power supply anti-parallel circuits (CN 116191645 A) exist in the prior art. Specifically, this circuit ensures that the AC power supply of the main channel takes precedence over the backup channel, while simultaneously preventing the main and backup channels from operating in parallel. This circuit limits the main channel priority logic and requires two controllers and two relays for control. Consequently, the circuit is complex, the conversion time is relatively long, and the conversion logic is limited. Due to these long conversion times and limited conversion logic, it is impossible to achieve the same conversion time and bidirectional conversion functionality as a single AC conversion contactor.

[0003] Therefore, there is a need to provide a timing controlled power conversion device and method. Summary of the Invention

[0004] In order to solve the technical problems in the related art of realizing the conversion of two incompatible AC power sources, such as complex circuits, long conversion times, and priority restrictions on conversion logic, which make it impossible to achieve a conversion time and bidirectional conversion function equivalent to that of a single AC conversion contactor, the present invention provides a timing-controlled power conversion device and method, which simplifies the circuit, shortens the conversion time, and does not have priority restrictions on conversion logic. It can achieve a conversion time and bidirectional conversion function equivalent to that of a single AC conversion contactor, and safely and reliably prevents power failure and damage caused by arcing of a single AC conversion contactor or two AC power contactors during power conversion. The technical solution is as follows: In a first aspect, a timing controlled power conversion device is provided, comprising: a controller KZQ, a bus bar WP, a first power contactor GB1, a second power contactor GB2 and a relay J; Among them, the controller KZQ is connected to the second power contactor GB2 and the relay J, the second power contactor GB2 is connected to the auxiliary contact of the first power contactor GB1, and the grounding end of the relay J is grounded; the negative end of the coil of the first power contactor GB1 is grounded through the auxiliary contact of the relay J, and the positive end of the coil is connected to the power module, the bus WP is connected to the external first AC power supply P2 through the main contact of the second power contactor GB2, and the bus WP is connected to the external second AC power supply P1 through the main contact of the first power contactor GB1; the auxiliary contact of the first power contactor GB1 controls the negative end of the coil of the second power contactor GB2, and the relay J is used to control the negative line of the first power contactor GB1. The negative end of the coil of the relay J is often connected, and the positive end of the coil of the first power contactor GB1 is often powered.

[0005] In one implementable manner, when the first criterion condition is met, the controller KZQ outputs a positive power transfer control signal to the second power contactor GB2 and the positive end of the coil of the relay J. The relay J first operates to cut off the negative end of the coil of the first power contactor GB1, and then the first power contactor GB1 is released, and its main contact is disconnected. The first AC power supply P1 is disconnected from the bus WP. After the auxiliary contact of the first power contactor GB1 is synchronously released into position, the negative end of the coil of the second power contactor GB2 is connected. The second power contactor GB2 is energized, and its main contact is connected. The second AC power supply P2 supplies power to the bus WP. The auxiliary contact of the first power contactor GB1 is released into position and the main contact of the second power contactor GB2 is energized, thereby realizing the safe, reliable, sequential and rapid power transfer function of two incompatible AC power sources.

[0006] In one implementable method, when the second criterion condition is met, the controller KZQ does not output a positive power transfer control signal to the positive end of the coil of the second power contactor GB2 and the relay J. The second power contactor GB2 and the relay J are in a released state, and the main contact of the second power contactor GB2 is disconnected. The second AC power supply P2 is disconnected from the bus WP, the negative end of the coil of the first power contactor GB1 is grounded, the first power contactor GB1 is energized, and its main contact is connected, then the first AC power supply P1 supplies power to the bus WP.

[0007] In a second aspect, a method for sequentially controlling power conversion is provided, which is used in any of the sequentially controlling power conversion devices described in the first aspect, the method comprising: When the first judgment condition is met, the controller KZQ outputs a positive power transfer control signal to the second power contactor GB2 and the positive end of the coil of the relay J. The relay J first operates to cut off the negative end of the coil of the first power contactor GB1. Then the first power contactor GB1 is released, and its main contact is disconnected. The first AC power supply P1 is disconnected from the bus WP. After the auxiliary contact of the first power contactor GB1 is synchronously released into place, the negative end of the coil of the second power contactor GB2 is connected. Then the second power contactor GB2 is energized, and its main contact is connected. The second AC power supply P2 supplies power to the bus WP. After the auxiliary contact of the first power contactor GB1 is released into place, the main contact of the second power contactor GB2 is energized into place, thereby realizing a safe, reliable, sequential and fast power transfer function between two incompatible AC power sources. When the second judgment condition is met, the controller KZQ does not output the positive power transfer control signal to the positive end of the coil of the second power contactor GB2 and the relay J. The second power contactor GB2 and the relay J are in the released state, then the main contact of the second power contactor GB2 is disconnected, the second AC power supply P2 is disconnected from the bus WP, the negative end of the coil of the first power contactor GB1 is grounded, the first power contactor GB1 is energized, its main contact is connected, and the first AC power supply P1 supplies power to the bus WP.

[0008] Among them, the first judgment condition is: receiving the first external switch conversion instruction and the voltage of the first AC power supply P1 is 0, and the first external switch conversion instruction is used to instruct the conversion from the first AC power supply P1 to the second AC power supply P2 to power the bus WP.

[0009] Among them, the second judgment condition is: receiving the second external switch conversion instruction and the voltage of the second AC power supply P2 is 0, and the second external switch conversion instruction is used to instruct the conversion from the second AC power supply P2 to the first AC power supply P1 to power the bus WP.

[0010] In a third aspect, a timing-controlled power conversion system is provided, comprising a timing-controlled power conversion device as described in any one of the first aspects, and a first power supply and a second power supply, wherein the device is connected between the first power supply and the second power supply.

[0011] The first power supply and the second power supply are AC power supplies or DC power supplies. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of a timing-controlled power conversion device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0013] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0014] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed in order to provide a comprehensive understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific arrangement and method proposed below, but rather encompasses any improvements, replacements, and modifications to structures, methods, and devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, well-known structures and techniques are not shown to avoid unnecessary ambiguity in the present invention.

[0015] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other, and the various embodiments may refer to and quote each other.

[0016] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] The present invention aims to solve the problem of two incompatible AC power sources having to switch power supplies in strict sequence, achieve a conversion time and bidirectional conversion function equivalent to that of a single AC conversion contactor, and safely and reliably prevent power failure and damage caused by arcing of a single AC conversion contactor or two AC power supply contactors during power conversion. The present invention provides a device, method, and system for controlling the conversion power supply of two incompatible AC power sources in a sequential order.

[0018] The present invention outputs a signal to synchronously control the positive end of the coil of relay J and power contactor 2 (GB2) through controller KZQ after certain judgment conditions are met. The negative end of the coil of relay J is always connected, so relay J first acts to cut off the signal control of the negative end of the coil of power contactor 1 (GB1). The positive end of the coil of power contactor 1 (GB1) is always powered, and the main contacts and auxiliary contacts of power contactor 1 (GB1) are subsequently released. After the auxiliary contacts are released into place, the negative end signal of the coil of power contactor 2 (GB2) is controlled to be connected, and finally the main contacts of power contactor 2 (GB2) are attracted to realize the conversion and power supply of two incompatible AC power sources.

[0019] The judgment criteria are: external switch command or AC power supply 1 (P1) voltage is 0. Relay J is used to control the negative terminal of the coil of power contactor 1 (GB1). The auxiliary contact of power contactor 1 (GB1) is used to control the negative terminal of the coil of power contactor 2 (GB2). This implements the hardware lock function, which prevents power failure and damage caused by two incompatible AC power sources supplying power at the same time. In the present invention, the relay J first operates to cut off the negative line of the power contactor 1 (GB1), and then the power contactor 1 (GB1) is released, and its main contact is disconnected, so that the AC power supply 1 (P1) is disconnected from the bus bar. After the auxiliary contacts of the power contactor 1 (GB1) are synchronously released into place, the negative end of the coil of the power contactor 2 (GB2) is connected, and the power contactor 2 (GB2) is finally attracted, and its main contact is connected, and the AC power supply 2 (P2) supplies power to the bus bar WP. This can solve the problem that two incompatible AC power sources may cause short circuit or other damage due to arcing between the contacts of a single conversion AC contactor when switching power, and still achieve the power conversion effect of a single AC conversion contactor in a very short time (millisecond level).

[0020] Specifically, the embodiment of the present invention provides a timing control power conversion device and method. The circuit schematic diagram of the present invention is shown in FIG. Figure 1Its components mainly include: controller KZQ, bus bar WP, power contactor 1 (GB1), power contactor 2 (GB2) and relay J.

[0021] The controller KZQ is used to receive external switch instructions, detect power parameter conditions, and trigger the output power contactor 2 (GB2) and the positive terminal control signal of the coil of relay J according to the external switch instructions or power parameter conditions.

[0022] Busbar WP is the power supply terminal in the power supply system. The power contactor is installed between the power supply and the busbar. The circuit structure has two power contactors. The auxiliary contact of power contactor 1 (GB1) controls the negative terminal of the coil of power contactor 2. Relay J is used to control the negative line of power contactor 1 (GB1). Controller KZQ outputs a positive power transfer control signal to the positive end of the coil of power contactor 2 and relay J. Relay J first acts to cut off the negative line of power contactor 1 (GB1), and then power contactor 1 (GB1) is released, its main contact is disconnected, and the AC power supply 1 (P1) is disconnected from the bus WP. After the auxiliary contacts of power contactor 1 (GB1) are synchronously released into place, the negative end of the coil of power contactor 2 (GB2) is connected, and power contactor 2 (GB2) is attracted, its main contact is connected, and AC power supply 2 (P2) supplies power to bus WP. The safe, reliable, sequential and rapid power transfer function of two incompatible AC power sources is realized by relying on the auxiliary contacts of power contactor 1 (GB1) being released into place and the main contacts of power contactor 2 (GB2) being attracted into place.

[0023] The key points of the present invention are as follows: 1. After certain criteria are met, the controller KZQ outputs a signal to synchronously control the positive end of the coil of relay J and power contactor 2 (GB2). The negative end of the coil of relay J is always connected, so relay J first acts to cut off the negative end signal control of the coil of power contactor 1 (GB1). The positive end of the coil of power contactor 1 (GB1) is always powered, and the main contacts and auxiliary contacts of the power contactor (GB1) are subsequently released. After the auxiliary contacts are released into place, the negative end signal of the coil of power contactor 2 (GB2) is controlled to be connected, and finally the main contacts of power contactor 2 (GB2) are attracted to realize the conversion of two incompatible AC power supplies.

[0024] 2. The judgment condition of key point 1 is: external switch command or AC power supply 1 (P1) voltage is 0.

[0025] 3. Relay J at key point 1 is used to control the negative terminal of the coil of power contactor 1 (GB1). The auxiliary contact of power contactor 1 (GB1) is used to control the negative terminal of the coil of power contactor 2 (GB2) to implement a hardware locking function. This prevents power failure and damage caused by two incompatible AC power sources supplying power at the same time.

[0026] 4. In the present invention, relay J first operates to cut off the negative line of power contactor 1 (GB1), then power contactor 1 (GB1) is released, its main contact is disconnected, and AC power source 1 (P1) is disconnected from the busbar. After the auxiliary contacts of power contactor 1 (GB1) are synchronously released into place, they connect the negative end of the coil of power contactor 2 (GB2). Then, power contactor 2 (GB2) is finally attracted, its main contact is connected, and AC power source 2 (P2) supplies power to busbar WP. This can solve the problem that two incompatible AC power sources may cause short circuit or other damage due to arcing between the contacts of a single conversion AC contactor when switching power, and still achieve the power conversion effect of a single AC conversion contactor in a very short time (millisecond level).

[0027] In summary, this invention solves the problem of short circuits or other damage caused by arcing between the contacts of a single AC conversion contactor when switching between two incompatible AC power sources. It also safely and reliably achieves the requirement for extremely short (millisecond-level) power conversion between two incompatible AC power sources. It has been put into practical use with good results and has broad prospects for widespread application. Furthermore, the circuit structure and method of this invention can also be applied to converting power between two DC power sources of different voltages.

[0028] The above merely describes the embodiments of the present invention, and while the description is relatively specific and detailed, it should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the scope of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Furthermore, any portions not described in detail herein are conventional techniques.

Claims

1. A timing controlled power conversion device, characterized in that: include: Controller KZQ, bus bar WP, first power contactor GB1, second power contactor GB2 and relay J; Among them, the controller KZQ is connected to the second power contactor GB2 and the relay J, the second power contactor GB2 is connected to the auxiliary contact of the first power contactor GB1, and the grounding end of the relay J is grounded; the negative end of the coil of the first power contactor GB1 is grounded through the auxiliary contact of the relay J, and the positive end of the coil is connected to the power module, the bus WP is connected to the external first AC power supply P2 through the main contact of the second power contactor GB2, and the bus WP is connected to the external second AC power supply P1 through the main contact of the first power contactor GB1; the auxiliary contact of the first power contactor GB1 controls the negative end of the coil of the second power contactor GB2, and the relay J is used to control the negative line of the first power contactor GB1. The negative end of the coil of the relay J is often connected, and the positive end of the coil of the first power contactor GB1 is often powered.

2. The device according to claim 1, characterized in that When the first judgment condition is met, the controller KZQ outputs a positive power transfer control signal to the second power contactor GB2 and the positive end of the coil of the relay J. The relay J first acts to cut off the negative end of the coil of the first power contactor GB1, and then the first power contactor GB1 is released, and its main contact is disconnected. The first AC power supply P1 is disconnected from the bus WP. After the auxiliary contact of the first power contactor GB1 is synchronously released into place, the negative end of the coil of the second power contactor GB2 is connected. The second power contactor GB2 is energized, and its main contact is connected. The second AC power supply P2 supplies power to the bus WP. The auxiliary contact of the first power contactor GB1 is released into place and the main contact of the second power contactor GB2 is energized, thereby realizing the safe, reliable, sequential and rapid power transfer function of two incompatible AC power sources.

3. The device according to claim 1, characterized in that When the second judgment condition is met, the controller KZQ does not output the positive power transfer control signal to the positive end of the coil of the second power contactor GB2 and the relay J. The second power contactor GB2 and the relay J are in the released state, then the main contact of the second power contactor GB2 is disconnected, the second AC power supply P2 is disconnected from the bus WP, the negative end of the coil of the first power contactor GB1 is grounded, the first power contactor GB1 is energized, its main contact is connected, and the first AC power supply P1 supplies power to the bus WP.

4. A timing controlled power conversion method, characterized in that: For the timing controlled power conversion device according to claim 1, the method comprises: When the first judgment condition is met, the controller KZQ outputs a positive power transfer control signal to the second power contactor GB2 and the positive end of the coil of the relay J. The relay J first operates to cut off the negative end of the coil of the first power contactor GB1. Then the first power contactor GB1 is released, and its main contact is disconnected. The first AC power supply P1 is disconnected from the bus WP. After the auxiliary contact of the first power contactor GB1 is synchronously released into place, the negative end of the coil of the second power contactor GB2 is connected. Then the second power contactor GB2 is energized, and its main contact is connected. The second AC power supply P2 supplies power to the bus WP. After the auxiliary contact of the first power contactor GB1 is released into place, the main contact of the second power contactor GB2 is energized into place, thereby realizing a safe, reliable, sequential and fast power transfer function between two incompatible AC power sources. When the second judgment condition is met, the controller KZQ does not output the positive power transfer control signal to the positive end of the coil of the second power contactor GB2 and the relay J. The second power contactor GB2 and the relay J are in the released state, then the main contact of the second power contactor GB2 is disconnected, the second AC power supply P2 is disconnected from the bus WP, the negative end of the coil of the first power contactor GB1 is grounded, the first power contactor GB1 is energized, its main contact is connected, and the first AC power supply P1 supplies power to the bus WP.

5. The method according to claim 4, characterized in that The first judgment condition is: receiving the first external switch conversion instruction and the voltage of the first AC power supply P1 is 0, and the first external switch conversion instruction is used to instruct the conversion from the first AC power supply P1 to the second AC power supply P2 to power the bus WP.

6. The method according to claim 4, characterized in that The second judgment condition is: receiving the second external switch conversion instruction and the voltage of the second AC power supply P2 is 0, and the second external switch conversion instruction is used to instruct the conversion from the second AC power supply P2 to the first AC power supply P1 to power the bus WP.

7. A timing controlled power conversion system, characterized in that: The device comprises a timing-controlled power conversion device as claimed in any one of claims 1 to 3, and a first power supply and a second power supply, wherein the device is connected between the first power supply and the second power supply.

8. The system according to claim 7, characterized in that The first power supply and the second power supply are AC power supplies or DC power supplies.

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