Single-phase electric intelligent control system
By using a combination of thermistor and delay switch in a single-phase electrical intelligent control system, the problem of high current during startup is solved, and the protection and stable power supply of electrical components are achieved.
Patent Information
- Application Number
- CN202420777430.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-16
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-04-16
AI Technical Summary
The existing single-phase power control system will generate a large current when it is started, which can easily cause damage to electrical components. A single-phase electrical intelligent control system is needed that can effectively reduce the starting current.
A single-phase electrical intelligent control system is designed, including a main control module, a clock module, an AC input module, a first thermistor, a first delay switch, a first control circuit and an AC output module. The high resistance characteristics of the thermistor reduce the current at startup and complete the power-on by delay closing to avoid the power loss of the thermistor.
It effectively reduces the instantaneous peak of the starting current, protects the components in the circuit, and achieves stable power supply.
Smart Images
Figure CN222484565U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of power supply control, in particular to a single-phase power intelligent control system. Background Art
[0002] 220V single-phase AC power supply is widely used in industry. When in use, circuit breakers and relays are usually used to control the on and off of the power supply. When the single-phase power supply is used to supply power to an AC fan or a water pump, a large current will be generated during startup. Most of the existing single-phase power supply control systems start directly, which can easily cause overcurrent during startup and damage electrical components. Therefore, a single-phase power intelligent control system that can effectively reduce the starting current is needed. Utility Model Content
[0003] The problem solved by the utility model is how to provide a single-phase electric intelligent control system which can effectively reduce the starting current.
[0004] To solve the above problems, the utility model provides a single-phase electric intelligent control system, including: a main control module, a clock module, an AC input module, a first thermistor, a first delay switch, a first control circuit and an AC output module, the input end of the AC input module is connected to an external input power supply, the controlled end is connected to the main control module, and is used to access a single-phase AC power supply and control the on and off of the single-phase AC power supply, the clock module is connected to the main control module, and provides a clock signal to the main control module, the input end of the first delay switch is connected to the output end of the AC input module, and the output end is connected to the input end of the AC output module, the input end of the first control circuit is connected to the main control module, and the output end is connected to the first delay switch, so as to control the first delay switch to delay closing according to the control signal of the main control module, and the first thermistor is connected in parallel at both ends of the first delay switch.
[0005] Furthermore, the single-phase electric intelligent control system also includes a power conversion module, the input end of the power conversion module is connected to the external input power supply, and the output end is respectively connected to the main control module and the first control circuit, for converting the single-phase AC power supply into a DC power supply.
[0006] Furthermore, the first control circuit includes a first optocoupler, a first transistor and a first relay, the input end of the first optocoupler is connected to the output end of the main control module, the output end is connected to the base of the first transistor, the collector of the first transistor is connected to the output end of the power conversion module, the emitter is connected to the first end of the coil of the first relay, the second end of the coil of the first relay is grounded, and the normally open contact switch of the first relay serves as the first delay switch.
[0007] Furthermore, the first control circuit also includes a first diode, and the first diode is connected in parallel at both ends of the coil of the first relay.
[0008] Furthermore, the AC input module includes a first circuit breaker, a first power switch and a second control circuit, the input end of the first power switch is connected to the first circuit breaker, and the output end is connected to the first delay switch, the input end of the second control circuit is connected to the main control module, and the output end is connected to the first power switch.
[0009] Furthermore, the AC input module also includes a metering circuit, which includes a metering chip, and a current transformer and a voltage transformer arranged at the output port of the first circuit breaker. The input end of the metering chip is respectively connected to the current transformer and the voltage transformer, and the output end is connected to the main control module.
[0010] Furthermore, the AC output module includes a first thermal relay and an output port, the input end of the first thermal relay is connected to the output end of the AC input module through the first delay switch, the output end is connected to the output port, and the first thermal relay is used for overcurrent protection.
[0011] Furthermore, the single-phase electricity intelligent control system also includes an interaction module connected to the main control module.
[0012] Compared with the prior art, the beneficial effects of the utility model are:
[0013] When it is necessary to control the single-phase AC power supply to supply power to the load, the input end of the AC input module is connected to the single-phase AC power supply, and the main control module sends a control signal to the power switch in the AC input module. At the same time, a delay control signal is sent to the first control circuit. In this way, when power is turned on, the single-phase AC power is input by the AC input module, and first supplies power to the load through the thermistor and the AC output module. Due to the high resistance characteristics of the thermistor in a cold state, the instantaneous starting current at startup is effectively lowered, and as the current heats up, the resistance of the thermistor gradually decreases, making the starting current change smoother. After a period of time, the first delay switch is controlled by the first control circuit to short-circuit the thermistor, delay closing, and complete startup. This method effectively reduces the instantaneous starting current and protects the components in the circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall principle structure of an embodiment of the utility model;
[0015] Figure 2 This is a schematic diagram of the principle structure of the first control circuit of the embodiment of the utility model;
[0016] Figure 3This is a schematic diagram of the principle structure of the AC input module of the embodiment of the utility model.
[0017] Description of reference numerals:
[0018] 1-main control module; 2-clock module; 3-AC input module; 4-first thermistor; 5-first delay switch; 6-first control circuit; 7-AC output module; 31-first circuit breaker; 32-first power switch; 33-second control circuit; 34-metering circuit; 71-first thermal relay; 72-output port. DETAILED DESCRIPTION
[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0021] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment" and "one implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.
[0022] like Figure 1As shown, the utility model provides a single-phase electric intelligent control system, including: a main control module 1, a clock module 2, an AC input module 3, a first thermistor 4, a first delay switch 5, a first control circuit 6 and an AC output module 7, wherein the input end of the AC input module 3 is connected to an external input power supply, and the controlled end is connected to the main control module 1, for accessing a single-phase AC power supply and controlling the on and off of the single-phase AC power supply, the clock module 2 is connected to the main control module 1, and provides a clock signal to the main control module 1, the input end of the first delay switch 5 is connected to the output end of the AC input module 3, and the output end is connected to the input end of the AC output module 7, the input end of the first control circuit 6 is connected to the main control module 1, and the output end is connected to the first delay switch 5, so as to control the first delay switch 5 to delay closing according to the control signal of the main control module 1, and the first thermistor 4 is connected in parallel to both ends of the first delay switch 5.
[0023] It should be noted that when powering loads such as fans and water pumps, the input end of the AC input module 3 is connected to a single-phase AC power supply, and the main control module 1 sends a control signal to the AC input module 3. At the same time, a delay control signal is sent to the first control circuit 6. In this way, when power is turned on, the single-phase AC power supply is input by the AC input module 3, and firstly powers the load through the thermistor and the AC output module 7. Due to the high resistance characteristic of the thermistor in a cold state, the instantaneous starting current at startup is effectively lowered, and as the current heats up, the resistance of the thermistor gradually decreases, making the starting current change smoother. After a period of time, the first delay switch 5 is controlled by the first control circuit 6, and is closed with a delay to short-circuit the thermistor to complete the startup. The single-phase AC power is supplied to the load through the first delay switch 5 and the AC output module 7, avoiding the power loss at the thermistor and achieving stable power supply. The main control module 1 can use a single-chip microcomputer chip, such as STM32F103ZET6.
[0024] In one embodiment of the utility model, the single-phase electric intelligent control system also includes a power conversion module, the input end of the power conversion module is connected to an external input power supply, and the output end is respectively connected to the main control module 1 and the first control circuit 6, for converting the single-phase AC power into a DC power.
[0025] It should be noted that the power conversion module is connected to the AC input, and a rectifier bridge and a voltage conversion chip can be used to convert the 220V AC power supply into 3.3V and 24V DC power supplies. The 3.3V and 24V DC power supplies power the chips and relay coils in the subsequent main control module 1 and the first control circuit 6.
[0026] In one embodiment of the utility model, the first control circuit 6 includes a first optocoupler, a first transistor and a first relay, the input end of the first optocoupler is connected to the output end of the main control module 1, the output end is connected to the base of the first transistor, the collector of the first transistor is connected to the output end of the power conversion module, the emitter is connected to the first end of the coil of the first relay, the second end of the coil of the first relay is grounded, and the normally open contact switch of the first relay serves as the first delay switch 5.
[0027] It should be noted that if Figure 2 As shown, when the main control module 1 sends a delay control signal to the first control circuit 6, the first optical coupler P1 performs photoelectric isolation on the delay control signal to improve signal stability. The base of the first transistor Q1 receives the delay control signal, the first transistor Q1 is turned on, and the 24V voltage is connected to the first end of the coil of the first relay K1 through the collector and emitter of the first transistor Q1, and the coil of the first relay K1 is powered on. In this embodiment, the normally open contact switch of the first relay K1 is used as the first delay switch 5. Figure 2 The 3 and 5 contacts of the first relay K1 are connected to the AC input module 3 and the AC output module 7 respectively. When the coil of the first relay K1 is not powered on, the 3 and 5 contacts of the first relay K1 are not conductive. When the coil of the first relay K1 is powered on, the normally open contact switch is closed, and the 3 and 5 contacts of the first relay K1 are conductive.
[0028] In one embodiment of the present invention, the first control circuit 6 further includes a first diode, and the first diode is connected in parallel to both ends of the coil of the first relay.
[0029] It should be noted that the first diode D1 plays a protective role and can absorb the inductive current generated by the coil of the first relay K1 when it is turned on and off.
[0030] In one embodiment of the utility model, the AC input module 3 includes a first circuit breaker 31, a first power switch 32 and a second control circuit 33, the input end of the first power switch 32 is connected to the first circuit breaker 31, and the output end is connected to the first delay switch 5, the input end of the second control circuit 33 is connected to the main control module 1, and the output end is connected to the first power switch 32.
[0031] It should be noted that if Figure 3As shown, the first circuit breaker 31 serves as the main switch of the incoming power supply. When the load is in use, the first circuit breaker 31 can be closed. When the load is not in use for a long time, the first circuit breaker 31 is disconnected. The power conversion module can be connected to the output terminal of the first circuit breaker 31. When the first circuit breaker 31 is closed, AC power is provided to the control part components of the subsequent stage. The main control module 1 controls the first power switch 32 through the second control circuit 33. The specific circuit structure can refer to the first control circuit 6 and the first delay switch 5. When starting, the main control module 1 sends a control signal to the second control circuit 33, delays for a period of time, and sends a delay control signal to the first control circuit 6. Figure 3 In the figure, the first thermistor 4, the first control circuit 6, etc. are not specifically shown, and their structures are similar to those of Figure 1 Consistent.
[0032] In one embodiment of the utility model, the AC input module 3 also includes a metering circuit 34, the metering circuit 34 includes a metering chip, and a current transformer and a voltage transformer arranged at the output port 72 of the first circuit breaker 31, the input end of the metering chip is respectively connected to the current transformer and the voltage transformer, and the output end is connected to the main control module 1.
[0033] It should be noted that the main control module 1 can obtain the power consumption information of the load by collecting the voltage and current at the output port 72 of the first circuit breaker 31 and collecting and calculating by the metering chip, and the metering chip model may be BL0940.
[0034] In one embodiment of the utility model, the AC output module 7 includes a first thermal relay 71 and an output port 72, the input end of the first thermal relay 71 is connected to the output end of the AC input module 3 through the first delay switch 5, and the output end is connected to the output port 72, and the first thermal relay 71 is used for overcurrent protection.
[0035] It should be noted that the output port 72 is used to connect the load, and the first thermal relay 71 plays a role of overcurrent protection. When the load is working, when the current in the main circuit exceeds the setting of the first thermal relay 71, the first thermal relay 71 will be disconnected for protection.
[0036] In one embodiment of the present invention, the single-phase power intelligent control system further includes an interaction module connected to the main control module 1 .
[0037] It should be noted that the interactive module may include buttons, key circuits and display circuits connected to the main control module 1. Through the buttons and key circuits, the user can send start or stop information to the main control module 1. The display circuit can display information such as working current and power consumption. Through the key circuit and display circuit, the delay time parameters can also be viewed and set.
[0038] Although the disclosure is as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the utility model.
Claims
1. A single-phase electric intelligent control system, characterized in that: include: A main control module (1), a clock module (2), an AC input module (3), a first thermistor (4), a first delay switch (5), a first control circuit (6) and an AC output module (7), wherein the input end of the AC input module (3) is connected to an external input power supply, the controlled end is connected to the main control module (1) and is used to access a single-phase AC power supply and control the on and off of the single-phase AC power supply, the clock module (2) is connected to the main control module (1) and provides a clock signal to the main control module (1), the input end of the first delay switch (5) is connected to the output end of the AC input module (3), and the output end is connected to the input end of the AC output module (7), the input end of the first control circuit (6) is connected to the main control module (1), and the output end is connected to the first delay switch (5), so as to control the first delay switch (5) to delay closing according to the control signal of the main control module (1), and the first thermistor (4) is connected in parallel to the two ends of the first delay switch (5).
2. The single-phase power intelligent control system according to claim 1 is characterized in that: It also comprises a power conversion module, the input end of which is connected to an external input power source, and the output end of which is respectively connected to the main control module (1) and the first control circuit (6), and is used to convert a single-phase AC power source into a DC power source.
3. The single-phase power intelligent control system according to claim 2 is characterized in that: The first control circuit (6) comprises a first optical coupler, a first transistor and a first relay, wherein the input end of the first optical coupler is connected to the output end of the main control module (1), the output end is connected to the base of the first transistor, the collector of the first transistor is connected to the output end of the power conversion module, the emitter is connected to the first end of the coil of the first relay, the second end of the coil of the first relay is grounded, and the normally open contact switch of the first relay serves as the first delay switch (5).
4. The single-phase power intelligent control system according to claim 3 is characterized in that: The first control circuit (6) further comprises a first diode, which is connected in parallel to both ends of the coil of the first relay.
5. The single-phase power intelligent control system according to claim 1 is characterized in that: The AC input module (3) comprises a first circuit breaker (31), a first power switch (32) and a second control circuit (33); an input end of the first power switch (32) is connected to the first circuit breaker (31), and an output end is connected to the first delay switch (5); an input end of the second control circuit (33) is connected to the main control module (1), and an output end is connected to the first power switch (32).
6. The single-phase power intelligent control system according to claim 5, characterized in that: The AC input module (3) further comprises a metering circuit (34), the metering circuit (34) comprising a metering chip, and a current transformer and a voltage transformer arranged at an output port (72) of the first circuit breaker (31), the input end of the metering chip being respectively connected to the current transformer and the voltage transformer, and the output end being connected to the main control module (1).
7. The single-phase power intelligent control system according to claim 1 is characterized in that: The AC output module (7) comprises a first thermal relay (71) and an output port (72); the input end of the first thermal relay (71) is connected to the output end of the AC input module (3) via the first delay switch (5); the output end is connected to the output port (72); and the first thermal relay (71) is used for overcurrent protection.
8. The single-phase power intelligent control system according to claim 1 is characterized in that: It also includes an interactive module connected to the main control module (1).