AC valve control system based on DC inversion
By using an AC valve control system based on DC inverter, the problems of poor stability and high standby power consumption of traditional AC valve control systems under different voltage environments are solved. Stable power supply and low power consumption are achieved in the global power grid environment, eliminating the need for iron core transformers and improving the stability and safety of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-04-03
AI Technical Summary
Traditional AC valve control systems have poor stability under different voltage environments, high standby power consumption, cannot adapt to global grid voltage differences, and the use of iron core transformers is inconvenient.
An AC valve control system based on DC inverter is adopted, including a high-voltage AC input circuit, a switching power supply circuit, an H-bridge inverter circuit, a short-circuit overcurrent detection circuit, a low-voltage AC output switching circuit, an MCU control circuit, a step-down voltage regulator circuit, and an AC valve. The switching power supply circuit rectifies the AC power into a stable low-voltage DC power, which is then converted into a stable low-voltage AC power by the MCU control circuit and the H-bridge inverter circuit. The AC power is monitored in real time by the short-circuit overcurrent detection circuit, eliminating the need for a core transformer.
It achieves stable power supply in a wide voltage range, reduces standby power consumption, prevents fault expansion, adapts to global grid voltage differences, and improves system stability and security.
Smart Images
Figure CN224083427U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of voltage conversion technology, and more specifically to an AC valve control system based on DC inverter. Background Technology
[0002] An AC valve is a solenoid valve that uses AC power to control the on / off state or flow direction of fluid. It is widely used in industrial and household equipment. The advantages of AC valves include: 1. Fast response: AC solenoid valves typically engage faster than DC solenoid valves; 2. Simple structure: The design is relatively simple, making them easy to install and maintain; 3. Low cost: Compared to DC solenoid valves, AC solenoid valves have lower manufacturing costs.
[0003] Residential communities and courtyards typically feature gardens where flowers and trees are grown. Irrigation pipes for these gardens are equipped with AC valves, whose operation determines whether water is supplied to the plants. These AC valves are small and require low AC voltage, usually 24V, which is considered low-voltage AC. Traditional AC valve control systems use iron-core transformers to convert AC 100V or AC 220V to AC 24V. Traditional iron-core transformers require input voltage selection; inserting an AC 100V transformer into an AC 220V power supply will burn it out; inserting a AC 220V transformer into an AC 100V power supply will result in insufficient output voltage, preventing the AC valve from opening properly. China's standard residential voltage is AC 220V, while the US and Japan use AC 100V.
[0004] Traditional iron-core transformers exhibit output voltage variations that change with the input voltage. When the input voltage is low, the output voltage may fall below AC 24V, affecting the normal opening of the AC valve. For high-voltage AC inputs with a wide range, multiple iron-core transformers are required. Due to technological limitations, the overall standby power consumption of iron-core transformers exceeds 2W. Therefore, to provide a more stable power supply to AC valves used for garden irrigation, this technical field urgently needs an AC valve control system based on a DC inverter. Utility Model Content
[0005] The technical problem to be solved by this utility model is to provide an AC valve control system based on DC inverter.
[0006] This invention is implemented as follows: an AC valve control system based on a DC inverter, comprising:
[0007] High-voltage AC input circuit, switching power supply circuit, H-bridge inverter circuit, short-circuit overcurrent detection circuit, low-voltage AC output on / off circuit, MCU control circuit, step-down voltage regulator circuit and AC valve;
[0008] The high-voltage AC input circuit is connected to the input terminal of the switching power supply circuit. The first output terminal of the switching power supply circuit is connected to the input terminal of the H-bridge inverter circuit. The second output terminal of the switching power supply circuit is connected to the input terminal of the buck regulator circuit. The output terminal of the H-bridge inverter circuit is connected to the input terminal of the short-circuit overcurrent detection circuit. The output terminal of the short-circuit overcurrent detection circuit is connected to the input terminal of the low-voltage AC output switching circuit. The output terminal of the low-voltage AC output switching circuit is connected to the power supply terminal of the AC valve. The AC valve is installed in the garden irrigation pipe. The output terminal of the buck regulator circuit is connected to the power supply terminal of the MCU control circuit. The SPWM signal transmitter of the MCU control circuit is connected to the SPWM signal receiver of the H-bridge inverter circuit. The feedback signal transmitter of the short-circuit overcurrent detection circuit is connected to the feedback signal receiver of the MCU control circuit.
[0009] Furthermore, it also includes a button panel, wherein the button signal transmitting end of the button panel is connected to the button signal receiving end of the MCU control circuit, and the on / off signal transmitting end of the MCU control circuit is connected to the on / off signal receiving end of the low-voltage AC output on / off circuit.
[0010] Furthermore, it also includes an LCD display screen, wherein the display signal transmitter of the MCU control circuit is connected to the display signal receiver of the LCD display screen.
[0011] Furthermore, it also includes LED indicator lights, with the status signal transmitter of the MCU control circuit connected to the status signal receiver of the LED indicator lights.
[0012] Furthermore, the high-voltage AC input circuit is connected to AC power from 90V to 240V, the switching power supply circuit outputs 35V DC power, the H-bridge inverter circuit outputs 24V AC power, and the buck regulator circuit outputs 3.3V DC power.
[0013] Furthermore, it also includes a solar cell, the first output terminal of which is connected to the input terminal of the H-bridge inverter circuit, and the second output terminal of which is connected to the input terminal of the buck regulator circuit.
[0014] Compared with the prior art, the beneficial effects or advantages of the present invention are as follows:
[0015] First, a switching power supply circuit rectifies a wide range of high-voltage AC power into stable low-voltage DC power. Then, the SPWM signal of the MCU control circuit, in conjunction with the H-bridge inverter circuit, converts the low-voltage DC power into the required stable low-voltage AC power, which is then supplied to the AC valve. The opening and closing of the AC valve determines whether the water pipe for garden irrigation sprays water. A step-down voltage regulator circuit generates the power required by the MCU. At the same time, a short-circuit and overcurrent detection circuit is used for real-time monitoring. When a short-circuit or overcurrent fault occurs, the power is automatically cut off to prevent the fault from escalating further. This invention eliminates the iron core transformer, resulting in lower standby power consumption and a more stable power supply to the AC valve used for garden irrigation. Attached Figure Description
[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0017] Figure 1 This is a schematic diagram of the AC valve control system based on DC inverter of this utility model. Figure 1 .
[0018] Figure 2 This is a schematic diagram of the AC valve control system based on DC inverter of this utility model. Figure 2 .
[0019] Figure reference numerals: 1. High-voltage AC input circuit; 2. Switching power supply circuit; 3. H-bridge inverter circuit; 4. Short-circuit overcurrent detection circuit; 5. Low-voltage AC output on / off circuit; 6. MCU control circuit; 7. Buck regulator circuit; 8. AC valve; 9. Button panel; 10. LCD display screen; 11. LED indicator; 12. Solar cell. Detailed Implementation
[0020] This utility model provides an AC valve control system based on DC inverter. The overall technical concept is as follows:
[0021] This invention utilizes a switching power supply to rectify a wide range of high-voltage AC power (90V to 240V) into a stable 35V low-voltage DC power. Then, through the SPWM signal of the MCU control circuit and the H-bridge inverter circuit, the 35V low-voltage DC power is converted into 24V low-voltage AC power. The 24V AC power passes through a low-voltage AC output switching circuit to reach the AC valve used for garden irrigation. A step-down and voltage-regulating circuit further reduces the 35V low-voltage DC power to 3.3V DC power, which serves as the power supply for the MCU. A short-circuit overcurrent detection circuit monitors the system in real time. When the current output by the H-bridge inverter circuit is too high, the circuit connection is disconnected, and a feedback signal is sent to the MCU control circuit. The MCU control circuit then stops outputting SPWM signals to the H-bridge inverter circuit, thereby stopping the output of low-voltage AC power to the AC valve, de-energizing it. This invention effectively reduces standby power consumption due to the use of digital switching control; the overall standby power consumption is less than 0.5W.
[0022] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.
[0023] See Figure 1 and Figure 2 The preferred embodiment of this utility model.
[0024] An AC valve control system based on a DC inverter, comprising:
[0025] 1. High-voltage AC input circuit; 2. Switching power supply circuit; 3. H-bridge inverter circuit; 4. Short-circuit overcurrent detection circuit; 5. Low-voltage AC output switching circuit; 6. MCU control circuit; 7. Buck voltage regulator circuit; and 8. AC valve.
[0026] The high-voltage AC input circuit 1 is connected to the input terminal of the switching power supply circuit 2. The first output terminal of the switching power supply circuit 2 is connected to the input terminal of the H-bridge inverter circuit 3. The second output terminal of the switching power supply circuit 2 is connected to the input terminal of the buck regulator circuit 7. The output terminal of the H-bridge inverter circuit 3 is connected to the input terminal of the short-circuit overcurrent detection circuit 4. The output terminal of the short-circuit overcurrent detection circuit 4 is connected to the input terminal of the low-voltage AC output switching circuit 5. The output terminal of the low-voltage AC output switching circuit 5 is connected to the power supply terminal of the AC valve 8. The AC valve 8 is installed in the garden irrigation pipe. The output terminal of the buck regulator circuit 7 is connected to the power supply terminal of the MCU control circuit 6. The SPWM signal transmitter of the MCU control circuit 6 is connected to the SPWM signal receiver of the H-bridge inverter circuit 3. The feedback signal transmitter of the short-circuit overcurrent detection circuit 4 is connected to the feedback signal receiver of the MCU control circuit 6.
[0027] The beneficial effects or advantages of this utility model's technical solution are as follows: First, a switching power supply circuit 2 is used to rectify a wide range of high-voltage AC power into stable low-voltage DC power. Then, the SPWM signal of the MCU control circuit 6, in conjunction with the H-bridge inverter circuit 3, converts the low-voltage DC power into the stable low-voltage AC power required by the MCU control circuit 6. Finally, the AC power is supplied to the AC valve 8, and the opening and closing of the AC valve 8 determines whether the water pipe used for garden irrigation sprays water. A step-down voltage regulator circuit 7 is also used to generate the power required by the MCU. At the same time, a short-circuit and overcurrent detection circuit 4 is used for real-time monitoring. When a short-circuit or overcurrent fault occurs, the power is automatically cut off to prevent the fault from escalating further. This utility model eliminates the need for an iron core transformer and provides a more stable power supply to the AC valve 8 used for garden irrigation.
[0028] In this embodiment, the high-voltage AC input circuit 1 can be a plug connected to the mains power.
[0029] Switching power supply circuit 2 is a common AC / DC power conversion device. It uses the switching action of a switching transistor to convert the input voltage into a pulse signal at a high frequency, which is then converted into a DC voltage output by a rectifier and filter circuit. It also has a feedback control function; by monitoring the output voltage and comparing it with a reference voltage, it adjusts the PWM duty cycle of the switching circuit to stabilize the output voltage. Switching power supply circuit 2 is adaptable to a certain input voltage range, such as 90V to 240V AC, to accommodate different regional power grid voltages. The switching power supply circuit outputs 35V DC.
[0030] The H-bridge inverter circuit is a common inverter topology widely used for DC-to-AC conversion. It consists of four switching elements (typically MOSFETs, IGBTs, or other power semiconductor devices) forming an "H" shape or employing a dedicated H-bridge integrated circuit. By controlling the on / off states of the four switching elements, it converts the DC input voltage into an AC output voltage. The H-bridge inverter circuit outputs 24V AC.
[0031] SPWM (Sinusoidal Pulse Width Modulation) is a special pulse width modulation (PWM) technique. Its core lies in controlling the change in pulse width to make the output signal waveform approximate a sine wave. The SPWM signal controls the on and off states of the switching elements in the H-bridge inverter circuit.
[0032] The short-circuit overcurrent detection circuit 4 is a common protection circuit used to detect whether a short circuit or overcurrent exists in a circuit. Its purpose is to quickly cut off the power supply in abnormal situations to protect the circuit and equipment. The short-circuit overcurrent detection circuit also sends an overcurrent feedback signal to the MCU control circuit, which then stops outputting the SPWM signal to the H-bridge inverter circuit. The short-circuit overcurrent detection circuit 4 can also be a current transformer, used to monitor the current magnitude in real time and feed it back to the MCU control circuit, which then determines whether the current is too high.
[0033] The low-voltage AC output switching circuit 5 is used to transmit 24V AC power to the AC valve 8. The AC valve 8, used for garden irrigation, is small in size and requires a lower AC voltage, typically 24V, which is considered low-voltage AC.
[0034] The step-down voltage regulator circuit 7 is a common circuit. In this embodiment, it is used to convert the 35V DC output from the switching power supply circuit 2 into 3.3V DC to power the MCU control circuit 6.
[0035] The core of the MCU control circuit 6 is the microcontroller, which integrates CPU, memory and peripheral functions. The MCU control circuit 6 is an indispensable part of modern electronic systems and is widely used in various devices, including home appliances, industrial equipment, automotive electronics and so on.
[0036] Furthermore, it also includes a button panel 9, the button signal transmitting end of the button panel 9 is connected to the button signal receiving end of the MCU control circuit 6, and the on / off signal transmitting end of the MCU control circuit 6 is connected to the on / off signal receiving end of the low-voltage AC output on / off circuit 5.
[0037] The operator can configure the MCU control circuit 6 via the keypad 9, and during maintenance, the operator can use the keypad 9 to send on / off signals to the MCU control circuit 6, changing the on / off state of the low-voltage AC output switching circuit 5, thereby manually controlling the opening and closing of the AC valve 8. The low-voltage AC output switching circuit 5 can also be a relay.
[0038] Furthermore, it also includes an LCD display screen 10, wherein the display signal transmitting end of the MCU control circuit 6 is connected to the display signal receiving end of the LCD display screen 10.
[0039] LCD display 10 is used to display the relevant settings of MCU control circuit 6.
[0040] Furthermore, it also includes an LED indicator 11, with the status signal transmitter of the MCU control circuit 6 connected to the status signal receiver of the LED indicator 11.
[0041] LED indicator 11 is used to indicate the status of AC valve 8, such as whether it is energized or working.
[0042] Furthermore, it also includes a solar cell 12, the first output terminal of which is connected to the input terminal of the H-bridge inverter circuit 3, and the second output terminal of which is connected to the input terminal of the buck regulator circuit 7.
[0043] When the high-voltage AC outlet in the garden is unavailable or there is no high-voltage AC outlet, solar cell 12 is used for power supply. Solar cell 12 outputs low-voltage DC power, which is converted into stable low-voltage AC power by H-bridge inverter circuit 3 and finally supplied to AC valve 8; the low-voltage DC power output of solar cell 12 also generates power for the MCU through buck regulator circuit 7.
[0044] In this embodiment, the solar cell normally outputs 12V DC power, which is then boosted to 35V DC power and transmitted to the H-bridge inverter circuit and the buck regulator circuit respectively.
[0045] The following details the functions of this invention: This invention employs DC inverter technology to rectify a wide range of AC input voltages from 90V to 240VAC into a stable DC voltage. Then, through an MCU control circuit, SPWM signal, and H-bridge inverter circuit, the 35V DC voltage is converted into a stable 50Hz or 60Hz AC voltage, outputting 24V AC power. Simultaneously, a short-circuit and overcurrent detection circuit is used for real-time monitoring. When a short circuit or overcurrent fault occurs at the output, the power is automatically cut off to prevent further escalation of the fault. Due to the use of digital switch control, this invention effectively reduces standby power consumption; the overall standby power consumption is less than 0.5W.
[0046] A switching power supply circuit converts AC input voltage into DC voltage through switching control, employing isolation conversion to ensure power safety at the output. Simultaneously, the switching power supply circuit features over-temperature protection to prevent safety issues caused by excessively high operating temperatures. The output voltage of the switching power supply is supplied to both the H-bridge inverter circuit and the buck regulator circuit.
[0047] The short-circuit and overcurrent detection circuit continuously monitors the output current of the H-bridge inverter circuit. When an overcurrent or short-circuit risk occurs, it cuts off the AC power to the low-voltage AC output switching circuit through the MOSFET control, protecting the AC valve from damage by large current. At the same time, the overcurrent fault signal is fed back to the MCU control circuit for processing.
[0048] The step-down regulator circuit converts 35V DC voltage into 3.3V DC voltage through switching and linear step-down methods and outputs it to the MCU control circuit.
[0049] The MCU control circuit generates a corresponding SPWM signal to control the forward or reverse conduction of the H-bridge inverter circuit, generating a 50Hz or 60Hz AC 24V voltage. Simultaneously, the MCU control circuit can control the opening and closing of the low-voltage AC output switching circuit according to the set work plan. Setting values are input via the keypad, and the MCU control circuit displays the input settings and execution status on an LCD display. The execution status is indicated by LED indicators.
[0050] The low-voltage AC output switching circuit is also used to convert 24V AC voltage into a pure sine wave AC voltage through LC filtering.
[0051] The buck regulator circuit is not limited to using switching buck or linear buck methods to generate a 3.3V DC voltage.
[0052] H-bridge inverter circuits are not limited to using discrete devices or integrated driver chips to generate forward or reverse switching signals.
[0053] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.
Claims
1. An AC valve control system based on DC inverter, characterized in that, include: High-voltage AC input circuit, switching power supply circuit, H-bridge inverter circuit, short-circuit overcurrent detection circuit, low-voltage AC output on / off circuit, MCU control circuit, step-down voltage regulator circuit and AC valve; The high-voltage AC input circuit is connected to the input terminal of the switching power supply circuit. The first output terminal of the switching power supply circuit is connected to the input terminal of the H-bridge inverter circuit. The second output terminal of the switching power supply circuit is connected to the input terminal of the buck regulator circuit. The output terminal of the H-bridge inverter circuit is connected to the input terminal of the short-circuit overcurrent detection circuit. The output terminal of the short-circuit overcurrent detection circuit is connected to the input terminal of the low-voltage AC output switching circuit. The output terminal of the low-voltage AC output switching circuit is connected to the power supply terminal of the AC valve. The AC valve is installed in the garden irrigation pipe. The output terminal of the buck regulator circuit is connected to the power supply terminal of the MCU control circuit. The SPWM signal transmitter of the MCU control circuit is connected to the SPWM signal receiver of the H-bridge inverter circuit. The feedback signal transmitter of the short-circuit overcurrent detection circuit is connected to the feedback signal receiver of the MCU control circuit.
2. The AC valve control system based on DC inverter according to claim 1, characterized in that, It also includes a button panel, wherein the button signal transmitting end of the button panel is connected to the button signal receiving end of the MCU control circuit, and the on / off signal transmitting end of the MCU control circuit is connected to the on / off signal receiving end of the low-voltage AC output on / off circuit.
3. The AC valve control system based on DC inverter according to claim 2, characterized in that, It also includes an LCD display screen, wherein the display signal transmitter of the MCU control circuit is connected to the display signal receiver of the LCD display screen.
4. The AC valve control system based on DC inverter according to claim 1, characterized in that, It also includes LED indicator lights, and the status signal transmitter of the MCU control circuit is connected to the status signal receiver of the LED indicator lights.
5. The AC valve control system based on DC inverter according to claim 1, characterized in that, The high-voltage AC input circuit is connected to AC power from 90V to 240V, the switching power supply circuit outputs 35V DC power, the H-bridge inverter circuit outputs 24V AC power, and the buck regulator circuit outputs 3.3V DC power.
6. The AC valve control system based on DC inverter according to claim 1, characterized in that, It also includes a solar cell, the first output terminal of which is connected to the input terminal of the H-bridge inverter circuit, and the second output terminal of which is connected to the input terminal of the buck regulator circuit.