Alternating-current voltage-stabilizing current-stabilizing power-stabilizing controller

Abstract

The utility model relates to the field of alternating-current power controllers, and discloses an alternating-current voltage-stabilizing current-stabilizing power-stabilizing controller, which comprises a sampling unit used for sampling output voltage, current and power and generating sampling signals; the control unit is connected with the sampling unit, and the control unit is used for analyzing and comparing the sampling signals; and the driving unit is connected with the control unit. According to the utility model, the load state can be monitored in real time through the load open circuit detection unit, output voltage or current is prevented from abnormally rising, a controller and a subsequent circuit are effectively protected from being damaged, and the AC-input-free detection unit can monitor whether input AC voltage exists or not and the amplitude of the input AC voltage in real time, so that a user can know the state of equipment in time; through the current isolation detection unit, the current state can be monitored under the condition of electrical isolation, the current isolation state is effectively detected, and the electromagnetic compatibility of the system is improved.

Description

Technical Field

[0001] The utility model relates to the field of AC power controllers, in particular to an AC voltage, current and power stabilizing controller. Background Art

[0002] AC voltage, current and power stabilization controller is an electrical control device that integrates voltage stabilization, current stabilization and power stabilization functions. It can maintain the stability of output voltage, current and power through internal adjustment mechanism when input voltage or load changes to meet the power requirements of specific equipment or systems.

[0003] The publication number after retrieval is: CN204465367U. An AC voltage, current and power stabilizing controller includes: a voltage and current acquisition converter, a voltage regulator, a current regulator, a triangular wave generator, a PWM generator and a waveform synthesis driver; the output end of the power supply voltage acquisition converter is respectively connected to the input end of the voltage regulator and the current regulator; the output end of the voltage regulator and the current regulator is respectively connected to the input end of the PWM generator; the output end of the triangular wave generator is connected to the input end of the PWM generator; the output end of the PWM generator is connected to the input end of the waveform synthesis driver.

[0004] During use, the existing AC power controller is unable to detect open-circuit load, no AC input and current isolation. It is difficult to determine whether the load is open-circuited, which may cause the output voltage or current to increase abnormally, and then damage the controller or subsequent circuits. When there is no AC input, if the controller cannot detect it in time and give a prompt or take protective measures, the device may be in an unresponsive state, affecting the user experience. The inability to effectively detect the current isolation state may cause electromagnetic interference inside or outside the system, affecting the accuracy of signal transmission and processing. Utility Model Content

[0005] To solve the above problems, the utility model is implemented through the following technical solutions: an AC voltage, current and power stabilizing controller, comprising: a sampling unit, used to sample the output voltage, current and power to generate a sampling signal; a control unit, connected to the sampling unit, and the control unit is used to analyze and compare the sampling signal; a driving unit, connected to the control unit, and the driving unit is used to receive the control signal of the control unit to adjust the voltage, current and power; a detection mechanism, connected to the control unit, and used to detect the load open circuit state, the no AC input state and the current isolation state; the detection mechanism comprises: a load open circuit detection unit, used to detect the load open circuit state; a no AC input detection unit, used to detect the no AC input state; a current isolation detection unit, used to detect the current isolation state.

[0006] The load open circuit detection unit includes: a load open circuit detection circuit, which is used to monitor the change of output voltage or current and determine whether the load is open circuit.

[0007] The no AC input detection unit comprises: an input voltage detection circuit, which is used to detect the presence or absence of input AC voltage and its amplitude.

[0008] The current isolation detection unit comprises: a current isolation detection circuit, which is a circuit for monitoring the current state under the condition of electrical isolation.

[0009] It also includes a protection mechanism, which includes: an overcurrent protection unit for preventing current overload; an overvoltage protection unit for preventing voltage from being too high; and an overtemperature protection unit for preventing the device from overheating.

[0010] The overcurrent protection unit comprises: an overcurrent protection circuit, which is used to cut off the power supply when the current in the circuit exceeds a set value.

[0011] The overvoltage protection unit comprises: an overvoltage protection circuit, which is used to disconnect the circuit when the input voltage or the output voltage exceeds a set range.

[0012] The over-temperature protection unit comprises: an over-temperature protection circuit, which is used to cut off the power supply when the temperature exceeds a set value.

[0013] It also includes: a voltage regulating unit connected to the driving unit and used to adjust the output voltage according to the control signal so that it is stabilized at a preset value; a current regulating unit connected to the driving unit and used to adjust the impedance in the circuit and stabilize the output current; and a power regulating unit connected to the driving unit and used to adjust the circuit parameters and stabilize the output power.

[0014] The utility model provides an AC voltage, current and power stabilizing controller. Compared with the prior art, it has the following beneficial effects: through the load open circuit detection unit, this solution can monitor the load status in real time. Once the load open circuit is detected, the drive signal of the inverter main circuit is immediately cut off to prevent the output voltage or current from abnormally increasing, effectively protect the controller and subsequent circuits from damage, and avoid potential safety risks caused by the load open circuit. The no AC input detection unit can monitor the presence and amplitude of the input AC voltage in real time. Once it is detected that there is no AC input or the input voltage is extremely low, the corresponding protection mechanism is immediately triggered and a prompt may be given, so that the user can understand the device status in time, avoid the device being in an unresponsive state, and improve the user's experience. Through the current isolation detection unit, the current state can be monitored under the condition of electrical isolation, the current isolation state can be effectively detected, and the internal or external electromagnetic interference of the system caused by poor current isolation can be prevented, the accuracy of signal transmission and processing can be ensured, and the electromagnetic compatibility of the system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure proposed by the utility model.

[0016] Figure 2 This is a diagram of the detection mechanism architecture proposed in the utility model.

[0017] Figure 3 This is a diagram of the protection mechanism architecture proposed in the utility model.

[0018] Figure 4 The figure is a circuit diagram of the no AC input detection unit proposed by the utility model.

[0019] Figure 5 The schematic diagram of the circuit of the load open circuit detection unit proposed by the utility model is shown in FIG.

[0020] The reference numerals in the figure are:

[0021] 10. Sampling unit; 20. Control unit; 21. Detection mechanism; 211. Open load detection unit; 212. No AC input detection unit; 213. Current isolation detection unit; 22. Protection mechanism; 221. Overcurrent protection unit; 222. Overvoltage protection unit; 223. Overtemperature protection unit; 30. Driving unit; 31. Voltage regulation unit; 32. Current regulation unit; 33. Power regulation unit. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0023] Reference Figure 1-Figure 5 , an AC voltage, current and power stabilizing controller, comprising: a sampling unit 10, used to sample the output voltage, current and power to generate a sampling signal; a control unit 20, connected to the sampling unit 10, the control unit 20 is used to analyze and compare the sampling signal; a driving unit 30, connected to the control unit 20, the driving unit 30 is used to receive the control signal of the control unit 20, and adjust the voltage, current and power; a detection mechanism 21, connected to the control unit 20, used to detect the load open circuit state, the no AC input state and the current isolation state; the detection mechanism 21 comprises: a load open circuit detection unit 211, used to detect the load open circuit state; a no AC input detection unit 212, used to detect the no AC input state; a current isolation detection unit 213, used to detect the current isolation state.

[0024] The sampling unit 10 can sample the output voltage, current and power in real time to ensure the accuracy and real-time performance of the data, and provide the control unit 20 with an accurate sampling signal, which is the basis for subsequent analysis and comparison, and ensures that the controller can accurately adjust the voltage, current and power; the control unit 20 quickly and accurately analyzes and compares the sampling signal, determines the circuit state, and makes corresponding control decisions. According to the analysis results, a control signal is generated to achieve accurate adjustment of the voltage, current and power, and improve the stability and response speed of the controller; the driving unit 30 receives the control signal of the control unit 20, quickly performs the voltage, current and power adjustment tasks, and ensures the stable output of the output voltage, current and power to meet the load requirements by accurately adjusting the circuit parameters; the detection mechanism 21 monitors the circuit state in real time through the load open circuit detection unit 211, the no AC input detection unit 212 and the current isolation detection unit 213, prevents the occurrence of potential faults, and promptly detects and handles abnormal conditions, such as load open circuit, no AC input and current isolation state, to ensure the safe operation of the controller and the load equipment.

[0025] Reference Figure 2 and Figure 5 The load open circuit detection unit 211 includes: a load open circuit detection circuit, the output current is isolated and sampled by the current transformer ZH1, and the current signal is converted into a conversion voltage signal by resistors RI1 and RI2, and filtered by resistor RI3 and capacitor CI. IF is the output current feedback signal, which is used to monitor the change of the output voltage or current and judge whether the load is open. The sampling circuit collects the output voltage and current signals in real time, and the control circuit analyzes and processes the sampled signals to judge whether the output voltage or current exceeds the preset range. If the output voltage or current exceeds the preset range and lasts for a certain period of time (to prevent misjudgment), it is judged that the load is open, and the protection circuit quickly cuts off the drive signal of the inverter main circuit, and may trigger a fault alarm and record fault information.

[0026] Reference Figure 2 and Figure 4The no AC input detection unit 212 includes: an input voltage detection circuit, K1, N connected to 220V / 380V, stepped down by resistors RA, RB, isolated by transformer TRA, and output into the comparator, REF is a 1.65V reference, and the AC signal passes through the IC1A comparator and INA is a square wave signal. This signal is used as a phase reference signal for phase shift control to monitor the presence and amplitude of the input AC voltage. The circuit includes components such as a voltage sensor, a voltage divider network, and a comparator. The voltage sensor converts the AC voltage into an electrical signal recognizable by the controller, and the voltage divider network reduces the high voltage signal to a range suitable for comparison. The comparator compares the actual voltage with the preset threshold voltage. When the input voltage is lower than the preset threshold (usually indicating no AC input or an extremely low input voltage), the comparator outputs a corresponding signal to the control circuit.

[0027] Reference Figure 2 The current isolation detection unit 213 includes: a current isolation detection circuit, a circuit for monitoring the current state under the condition of electrical isolation. The current isolation detection circuit is a circuit for monitoring the current state under the condition of electrical isolation. It can sense the current changes in the main circuit through magnetic induction or photoelectric conversion without directly connecting to the main circuit, and convert these changes into measurable electrical signals to realize the detection of the current isolation state. The current sensor senses the current changes in the main circuit and converts them into measurable electrical signals. The isolation amplifier amplifies the weak signal output by the sensor and maintains electrical isolation. The monitoring and protection circuit receives the amplified signal and compares it with the preset threshold. If the current isolation state is detected to be abnormal, the protection mechanism is triggered.

[0028] Reference Figure 3 The protection mechanism 22 includes: an overcurrent protection unit 221 for preventing current overload; an overvoltage protection unit 222 for preventing voltage from being too high; and an overtemperature protection unit 223 for preventing the device from overheating.

[0029] Reference Figure 3 and Figure 5 The overcurrent protection unit 221 includes: an overcurrent protection circuit. The overcurrent protection circuit is the same as the load open circuit detection circuit and is performed on the same circuit. The output current is isolated and sampled by the current transformer. The resistors RI1 and RI2 convert the current signal into a conversion voltage signal, which is filtered by the resistor RI3 and the capacitor CI. IF is the output current feedback signal, which is used to cut off the power supply when the current in the circuit exceeds the set value.

[0030] Reference Figure 3 The overvoltage protection unit 222 includes: an overvoltage protection circuit, which is used to disconnect the circuit when the input voltage or the output voltage exceeds a set range.

[0031] Reference Figure 3 The over-temperature protection unit 223 includes: an over-temperature protection circuit, which is used to cut off the power supply when the temperature exceeds a set value.

[0032] Reference Figure 1 The voltage regulating unit 31 is connected to the driving unit 30 and is used to adjust the output voltage according to the control signal so that it is stabilized at a preset value; the current regulating unit 32 is connected to the driving unit 30 and is used to adjust the impedance in the circuit and stabilize the output current; the power regulating unit 33 is connected to the driving unit 30 and is used to adjust the circuit parameters and stabilize the output power.

[0033] During use, after the controller is powered on, each unit performs initialization settings, including calibrating sensors, setting preset values, checking system status, etc. The sampling unit 10 starts working, samples the output voltage, current and power in real time, and generates sampling signals. The detection mechanism 21 is started at the same time, and the circuit status is monitored in real time through the load open circuit detection unit 211, the no AC input detection unit 212 and the current isolation detection unit 213. The load open circuit detection unit 211 monitors the change of the output voltage or current, collects signals through the sampling circuit, and the control circuit analyzes and processes to determine whether the load is open. The no AC input detection unit 212 monitors the presence and amplitude of the input AC voltage, and uses a voltage sensor, a voltage divider network and a comparator to achieve detection. The current isolation detection unit 213 monitors the current status under the condition of electrical isolation, and achieves detection through a current sensor, an isolation amplifier and a monitoring and protection circuit. The control unit 20 receives the signals from the sampling unit 10 and the detection mechanism 21, and performs fast and accurate analysis and comparison. According to the analysis results, the control unit 20 generates a corresponding control signal and sends it to the drive unit 30. The drive unit 30 receives the control signal of the control unit 20. The voltage regulating unit 31 adjusts the output voltage according to the control signal to stabilize it at a preset value. The current regulating unit 32 adjusts the impedance in the circuit to stabilize the output current. The power regulating unit 33 adjusts the circuit parameters to ensure the stability of the output power. During the entire working process, the protection mechanism 22 continuously monitors the circuit state. The overcurrent protection unit 221 monitors whether the current exceeds the set value. If it exceeds, the power supply is cut off. The overvoltage protection unit 222 monitors whether the input voltage or the output voltage exceeds the set range. If it exceeds, the circuit is disconnected. The overtemperature protection unit 223 monitors whether the device temperature exceeds the set value. If it exceeds, the power supply is cut off. If the detection mechanism 21 or the protection mechanism 22 finds an abnormal situation (such as open circuit of the load, no AC input, abnormal current isolation state, overcurrent, overvoltage, overtemperature, etc.), the corresponding protection mechanism will be triggered, and a fault alarm may be triggered and fault information may be recorded. The controller takes corresponding processing measures according to the fault type, such as cutting off the power supply, recording the fault log, sending an alarm signal, etc. When no abnormal situation occurs, the controller will maintain the stable output of the output voltage, current and power to meet the load requirements and ensure the normal operation of the equipment.

[0034] In summary, compared with the prior art, the present invention has the following beneficial effects: through the load open circuit detection unit 211, the present invention can monitor the load status in real time. Once the load open circuit is detected, the drive signal of the inverter main circuit is immediately cut off to prevent the output voltage or current from abnormally increasing, effectively protect the controller and subsequent circuits from damage, and avoid potential safety risks caused by the load open circuit. The no AC input detection unit 212 can monitor the presence and amplitude of the input AC voltage in real time. Once no AC input or extremely low input voltage is detected, the corresponding protection mechanism is immediately triggered and a prompt may be given, so that the user can understand the device status in time, avoid the device being in an unresponsive state, and improve the user's experience. Through the current isolation detection unit 213, the current state can be monitored under the condition of electrical isolation, the current isolation state can be effectively detected, and the internal or external electromagnetic interference of the system caused by poor current isolation can be prevented, the accuracy of signal transmission and processing can be ensured, and the electromagnetic compatibility of the system can be improved. This solution significantly improves the safety performance, user experience, electromagnetic compatibility, stability and reliability of the AC power controller by adding functions such as open load detection, no AC input detection and current isolation detection, as well as comprehensive protection mechanisms and precise adjustment and control capabilities, providing users with a safer, more reliable and intelligent power control solution.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An AC voltage, current and power stabilizing controller, characterized in that: include: A sampling unit (10) is used to sample the output voltage, current and power to generate a sampling signal; A control unit (20) connected to the sampling unit (10), the control unit (20) being used to analyze and compare the sampling signals; A drive unit (30) connected to the control unit (20), the drive unit (30) being used to receive a control signal from the control unit (20) and to adjust voltage, current and power; A detection mechanism (21), connected to the control unit (20), and used to detect a load open circuit state, a no AC input state, and a current isolation state; The detection mechanism (21) comprises: A load open circuit detection unit (211), used for detecting a load open circuit state; A no AC input detection unit (212), used to detect a no AC input state; The current isolation detection unit (213) is used to detect the current isolation state.

2. The AC voltage, current and power stabilizing controller according to claim 1, characterized in that: The load open circuit detection unit (211) comprises: The load open circuit detection circuit is used to monitor the change of output voltage or current and determine whether the load is open circuit.

3. The AC voltage, current and power stabilizing controller according to claim 1, characterized in that: The no AC input detection unit (212) comprises: The input voltage detection circuit is used to monitor the presence and amplitude of the input AC voltage.

4. The AC voltage, current and power stabilizing controller according to claim 1, characterized in that: The current isolation detection unit (213) comprises: A current isolation detection circuit is a circuit used to detect the current state under electrical isolation conditions.

5. The AC voltage, current and power stabilizing controller according to claim 1, characterized in that: It also includes a protection mechanism (22), wherein the protection mechanism (22) includes: An overcurrent protection unit (221), used to prevent current overload; An overvoltage protection unit (222), used to prevent excessive voltage; The over-temperature protection unit (223) is used to prevent the device from overheating.

6. The AC voltage, current and power stabilizing controller according to claim 5, characterized in that: The overcurrent protection unit (221) comprises: Overcurrent protection circuit is used to cut off the power supply when the current in the circuit exceeds the set value.

7. The AC voltage, current and power stabilizing controller according to claim 5, characterized in that: The overvoltage protection unit (222) comprises: Overvoltage protection circuit, used to disconnect the circuit when the input voltage or output voltage exceeds the set range.

8. The AC voltage, current and power stabilizing controller according to claim 5, characterized in that: The over-temperature protection unit (223) comprises: Over temperature protection circuit, used to cut off the power supply when the temperature exceeds the set value.

9. The AC voltage, current and power stabilizing controller according to claim 1, characterized in that: Also includes: A voltage regulating unit (31), connected to the driving unit (30), and used to adjust the output voltage according to the control signal so that the output voltage is stabilized at a preset value; A current regulating unit (32), connected to the driving unit (30), and used to adjust the impedance in the circuit and stabilize the output current; A power adjustment unit (33) is connected to the driving unit (30) and is used to adjust circuit parameters and stabilize output power.

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