Water pump controller input and output reverse connection protection circuit
By setting a relay circuit between the rectifier circuit of the water pump controller and the inverter circuit, the circuit breaking protection is achieved, and the input and output connection problem caused by human operation errors is solved, ensuring the safety and reliability of the circuit.
Patent Information
- Application Number
- CN202421855228.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-01
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-08-01
AI Technical Summary
During the operation of the water pump controller, the input and output are reversed due to human operation errors, which may cause damage to the water pump controller, scrapped inverter modules or even fire risk.
A water pump controller input and output connection reverse protection circuit is designed. By setting a relay circuit between the rectifier circuit and the inverter circuit, the circuit breaker protection is achieved by using the difference in the circuit paths when the correct connection is and the error.
Effectively prevent circuit damage caused by inverse input and output connection, ensure the safety and reliability of circuit devices, and the structure is simple and easy to repair.
Smart Images
Figure CN222897054U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of water pump control circuits, and in particular to a water pump controller input and output reverse connection protection circuit. Background Art
[0002] Human error is a common problem in the operation of water pump controllers, but it may lead to serious consequences. Especially when the operator mistakenly connects the three-phase power that should be input to the output of the water pump controller, this error will bring a series of serious effects, such as damage to the water pump controller, scrapping of the inverter module, and even more seriously, causing fire risks.
[0003] In order to solve the series of impacts caused by this error, it is necessary to create a water pump controller input and output reverse connection protection circuit that can effectively solve the above problems. Utility Model Content
[0004] In view of the above-mentioned shortcomings (problems) of the prior art, in order to solve the problem caused by the misconnection of the input and output of the water pump controller, the present application provides a water pump controller input and output reverse connection protection circuit.
[0005] To achieve the above-mentioned purpose and other related purposes, the present application adopts the following technical scheme: a water pump controller input and output reverse connection protection circuit, including a rectifier circuit, an inverter circuit, and a main control circuit, the rectifier circuit has three input terminals R, S, and T and two output terminals DC+ and DC-, the inverter circuit is connected to the two output terminals DC+ and DC-, the control terminal of the main control circuit is connected to the inverter circuit, and the inverter circuit also has three output terminals U, V, and W, a relay circuit is provided on the connection line between the rectifier circuit and the inverter circuit, the relay circuit is connected to the main control circuit and is powered by the main control circuit, and the main control circuit is powered by the rectifier circuit;
[0006] When the input power of the rectifier circuit is correctly connected, it provides power to the main control circuit and drives the relay circuit to work. The relay circuit controls the connection between the rectifier circuit and the inverter circuit.
[0007] When the output end of the inverter circuit is connected to the power supply, the main control circuit has no power supply and cannot drive the relay circuit to work. The relay circuit controls the rectifier circuit and the inverter circuit to remain disconnected.
[0008] Preferably, the relay circuit includes a coil portion and a switch contact portion, and the switch contact portion is a normally open switch.
[0009] Preferably, a freewheeling diode is connected in parallel to the coil portion.
[0010] In summary, the present application includes at least one of the following beneficial technical effects:
[0011] 1. Taking advantage of the difference in power supply paths when connected correctly and incorrectly, a relay circuit is set between the rectifier circuit and the inverter circuit to achieve circuit-breaking protection. That is, if the input is connected correctly, the normally open contacts of the relay circuit can be closed to form a power supply loop and realize the normal operation of the controller. If reverse connection occurs, the relay circuit has no power supply, so the circuit is broken to better protect the circuit components.
[0012] 2. Simple structure and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a circuit schematic diagram of an embodiment of the present application.
[0014] Description of main reference numerals:
[0015] 100, rectifier circuit; 200, inverter circuit; 300, main control circuit; 400, relay circuit; 401, coil part; 402, switch contact part. DETAILED DESCRIPTION
[0016] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.
[0017] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show the components related to the present application rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.
[0018] The specific implementation methods of the present application will be further described below in conjunction with the accompanying drawings.
[0019] Example:
[0020] The embodiment of the present application discloses a water pump controller input and output reverse connection protection circuit, including a rectifier circuit 100, an inverter circuit 200, and a main control circuit 300. The rectifier circuit 100, the inverter circuit 200, and the main control circuit 300 of the water pump controller are conventional circuits, so they are not described in detail. The rectifier circuit 100 is used to convert the input AC power into DC power. This DC power is also provided to the main control circuit 300, so that the main control circuit 300 obtains power. The main control circuit 300 mainly generates an adjustable PWM wave to act on the inverter circuit 200 to convert the DC power supply into an AC power output with adjustable frequency and voltage, thereby realizing precise control of the motor M.
[0021] The rectifier circuit 100 has three input terminals R, S, and T and two output terminals DC+ and DC-. The inverter circuit 200 is connected to the output terminals DC+ and DC-. The control terminal of the main control circuit 300 is connected to the inverter circuit 200. The inverter circuit 200 also has three output terminals U, V, and W. A relay circuit 400 is provided on the connection line between the rectifier circuit 100 and the inverter circuit 200. The relay circuit 400 is connected to the main control circuit 300 and is powered by the main control circuit 300. The main control circuit 300 is powered by the rectifier circuit 100.
[0022] When the input power of the rectifier circuit 100 is correctly connected, power is provided to the main control circuit 300 and the relay circuit 400 is driven to operate. The relay circuit 400 controls the connection between the rectifier circuit 100 and the inverter circuit 200.
[0023] When the output end of the inverter circuit 200 is connected to a power source, the main control circuit 300 has no power supply and cannot drive the relay circuit 400 to work. The relay circuit 400 controls the rectifier circuit 100 and the inverter circuit 200 to remain disconnected.
[0024] The relay circuit 400 includes a coil portion 401 and a switch contact portion 402, wherein the switch contact portion 402 is a normally open switch. A freewheeling diode is connected in parallel to the coil portion 401. The freewheeling diode can further extend the service life of the relay circuit 400 and make the relay coil portion 401 work more reliably.
[0025] Taking advantage of the difference in power supply paths when correctly connected and when incorrectly connected, a relay circuit 400 is set between the rectifier circuit 100 and the inverter circuit 200 to achieve circuit-breaking protection. That is, if the input is correctly connected, the normally open contacts of the relay circuit 400 can be closed to form a power supply loop, so that the controller can work normally. If reverse connection occurs, the relay circuit 400 will be disconnected because there is no power supply, so as to better protect the circuit components. The structure is simple and easy to maintain.
[0026] The above embodiments are only illustrative of the principles and effects of the present application, and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A water pump controller input and output reverse connection protection circuit, comprising a rectifier circuit (100), an inverter circuit (200), and a main control circuit (300), wherein the rectifier circuit (100) has three input terminals R, S, and T and two output terminals DC+ and DC-, the inverter circuit (200) is connected to the two output terminals DC+ and DC-, the control terminal of the main control circuit (300) is connected to the inverter circuit (200), and the inverter circuit (200) also has three output terminals U, V, and W, characterized in that: A relay circuit (400) is provided on the connection line between the rectifier circuit (100) and the inverter circuit (200); the relay circuit (400) is connected to the main control circuit (300) and is powered by the main control circuit (300); and the main control circuit (300) is powered by the rectifier circuit (100); When the input power of the rectifier circuit (100) is correctly connected, power is provided to the main control circuit (300) and the relay circuit (400) is driven to operate, and the relay circuit (400) controls the connection between the rectifier circuit (100) and the inverter circuit (200); When the output end of the inverter circuit (200) is connected to a power source, the main control circuit (300) has no power supply and cannot drive the relay circuit (400) to work, and the relay circuit (400) controls the rectifier circuit (100) and the inverter circuit (200) to remain disconnected.
2. A water pump controller input and output reverse connection protection circuit according to claim 1, characterized in that: The relay circuit (400) comprises a coil portion (401) and a switch contact portion (402), and the switch contact portion (402) is a normally open switch.