547 results about "Voltage ratio" patented technology

The invention relates to a CVT error evaluation method and device, error evaluation equipment and a storage medium, and belongs to the technical field of mutual inductor error recognized.The CVT error evaluation method comprises the steps that a first data set is restored to a primary voltage level based on voltage proportionality coefficients of multiple CVTs to obtain a second data set, and a difference matrix is constructed based on the second data set; establishing a likelihood function based on the difference matrix, and converting the likelihood function into a posterior probability density function based on a Bayesian formula; extracting data corresponding to a preset number of CVTs from the second data set to construct a third data set, and determining a prior probability density based on the third data set; and based on a multi-chain MCMC algorithm fused with plant rhizome growth and a posterior probability density function, determining error values corresponding to a plurality of CVTs when the posterior probability density is maximum. According to the method, the accuracy of CVT error evaluation is effectively ensured, and meanwhile, the error evaluation efficiency is also improved.

The invention discloses a CAN bus activity detection and wake-up circuit and method, and belongs to the technical field of CAN bus communication, the CAN bus activity detection and wake-up circuit comprises a CAN bus interface circuit, a signal detection and processing circuit and a controller, the input end of the CAN bus interface circuit is connected with a CAN bus; the signal detecting and processing circuit comprises a voltage comparator, the non-inverting input end and the inverting input end of the voltage comparator respectively receive a CANH signal and a CANL signal which are electrically isolated by the CAN bus interface circuit, and the output end of the voltage comparator is connected to a wake-up pin of the controller; the controller is used for monitoring the level state of the wake-up pin, and when the level of the wake-up pin is in an effective state, the electronic equipment is controlled to be switched from the sleep mode to the normal working mode. By introducing an electrical isolation and voltage difference detection mechanism, the problem of false wake-up caused by common-mode interference or bus noise in the prior art is solved, and reliable wake-up under low power consumption is realized.

The present disclosure is an open-loop digital PWM envelope tracking system with dynamic boost function. Systems, apparatuses, and methods are described for dynamically boosting (increasing) the supply voltage of an envelope tracking (ET) modulator in a transmitter system when the target / desired PA supply voltage exceeds a pre-determined threshold (e.g., the pre-determined threshold is equal to the available supply voltage of the system, such as the battery voltage). By boosting the supply voltage input to the ET modulator, the modulated supply provided to the power amplifier (PA) is also increased. As such, voltage clipping, which typically occurs when the target / desired PA supply voltage is higher than the available supply voltage, is mitigated or avoided, and the distortion of the transmitted signal is reduced.

The invention discloses a tunnel reluctance current sensor self-correction measurement method, system and device based on voltage feedback and a medium, and belongs to the technical field of current measurement and sensor anti-interference, and the method comprises the steps: extracting fundamental wave complex components at the fundamental wave frequency of a power supply voltage and an initial output voltage; calculating a filter coefficient according to the fundamental wave complex component and performing phase correction on the output voltage to obtain a corrected output voltage sequence aligned with the phase of the power supply voltage signal; calculating a voltage ratio signal according to the corrected output voltage and the power supply voltage and determining a ratio signal residual error; final current estimation is obtained according to the voltage ratio signal and the ratio signal residual error in combination with the ratio signal; according to the invention, a double-closed-loop compensation structure is adopted, so that channel mismatching and non-linear interference are effectively suppressed; the digital implementation mode enables the system to have good reconfigurability and environmental adaptability, and the system is suitable for application scenes such as intelligent power grids, distributed power monitoring and industrial online detection.

The invention provides a light load control method, an LLC resonant converter using the same and a storage medium, the method is based on a double closed-loop control structure of a voltage outer loop and a current inner loop, different load conditions are adapted by automatically switching a PFM mode, a PWM mode and a BURST mode, and the method comprises the following steps: setting control parameters; sampling an output voltage Vout and an output current Iout of the LLC resonant circuit; inputting a voltage error obtained by comparing a preset reference voltage Vref with the output voltage Vout into a PI controller of a voltage outer loop, and calculating to obtain a reference current Iref; a current error obtained by comparing the reference current Iref output by the voltage outer loop with the output current Iout is input into a PI controller of the current inner loop; and judging the working mode of the current control period according to the duty ratio Duty of the previous control period and the frequency demand f output by the current inner loop. According to the invention, through combination of double closed-loop control and three-mode intelligent switching, comprehensive optimization of efficiency, dynamic response and output voltage quality in a full-load range is realized.

The utility model relates to a kind of compressor inverter overcurrent protection circuit and air conditioner, belong to air conditioning technical field, including rectifier unit, sampling resistance, main control chip, overcurrent protection control switch, fault state self-locking maintenance switch, operational amplifier and voltage comparator.Sampling resistance gathers DC bus voltage signal, after amplification by operational amplifier, it is transmitted to the analog-digital conversion pin and voltage comparator of main control chip.Signal is compared with preset threshold by voltage comparator, low level is output when over threshold, makes overcurrent protection control switch open, rectifier unit is disabled;While fault state self-locking maintenance switch is turned on, and fault pin is locked as low level, realizes overcurrent protection and self-locking.The circuit cooperates by hardware and software, quickly responds overcurrent fault and prevents false restart, improves the security and reliability of air conditioning system.

The invention discloses a digital voltage compensation method, which relates to the technical field of power systems, and comprises the following steps: monitoring output voltage signals and load current signals of each point of a power grid in real time, establishing an output voltage digital sequence and a load current digital sequence, and extracting dynamic characteristic variables of current load current representing the change trend of a future time period; judging the working mode of the current running state; based on the voltage digital sequence, comparing with the reference voltage, calculating a real-time-reference voltage feedback compensation amount, taking the dynamic characteristic variable as input, establishing a load-voltage response prediction model, generating a voltage deviation prediction value in a future control period, and obtaining a voltage feed-forward compensation amount; and the current working mode is identified according to the working mode, a dynamic weight coefficient is given to the real-time-reference voltage feedback compensation amount and the voltage feed-forward compensation amount, the final compensation control amount of the voltage of each point of the power grid is calculated, and a driving signal is generated to dynamically adjust the voltage of each point of the power grid in real time and accurately. The power quality of the power grid is improved.

The invention discloses a thermionic cathode ionization gauge anode and cathode voltage automatic adjusting circuit, which is characterized in that a cathode stable emission control module emits electrons after a cathode reaches a red hot state, and the electrons move towards the anode under the traction of anode high voltage under a vacuum condition and flow to a cathode stable emission feedback circuit; after the first sampling voltage is compared with a preset voltage, the power of the heating cathode filament is adjusted to adjust emission electrons, and electron emission current is stabilized; and the anode voltage stabilization module adjusts the voltage output of the power supply module through the voltage division sampling circuit and compares the second sampling voltage with the standard voltage, if the anode voltage becomes large or small, the second sampling voltage is adjusted to output voltage through the voltage stabilization circuit, the output voltage is input to the high-frequency transformation primary side of the transformer, then the voltage is accompanied, a voltage loop is formed, and the anode voltage is stabilized. The circuit realizes automatic adjustment of the anode voltage and the cathode voltage of the hot cathode ionization gauge, so that the anode voltage and the cathode voltage are stable, and the vacuum test precision of the hot cathode ionization gauge is improved.

The application discloses a voltage regulating circuit, system and display device, the voltage regulating circuit comprises a voltage comparator, a switch module and a voltage regulating module, the output end of the voltage regulating module is connected with the positive input end of the voltage comparator and the input end of a display device, the negative input end of the voltage comparator is grounded, the output end of the voltage comparator is connected with the input end of the switch module, and the output end of the switch module is connected with the input end of the voltage regulating module; the voltage comparator is used for transmitting a first signal to the switch module when the voltage at the positive input end is greater than the voltage at the negative input end; the switch module is used for transmitting a second signal to the voltage regulating module according to the first signal; and the voltage regulating module is used for regulating the input voltage to obtain an output voltage according to the received voltage regulating control signal and the second signal, and outputting the output voltage through the output end of the voltage regulating module. The negative input end of the voltage comparator is grounded, so that the voltage regulating process is not affected by the rising rate of the output voltage.

The invention discloses a self-adaptive high-precision voltage detection device and method for a high-voltage bushing end screen, the device comprises a high-voltage arm unit, a low-voltage arm unit, a signal acquisition unit, a control unit and a power supply unit, and the high-voltage arm unit takes the capacitance characteristic of a high-voltage bushing as a high-voltage arm; the high-voltage arm unit is connected with the low-voltage arm in parallel, the low-voltage arm is connected with the signal acquisition unit, and the signal acquisition unit is connected with the control unit; the power supply unit is connected with the low-voltage arm unit and the control unit. Wherein the signal acquisition unit is used for monitoring partial voltage and current signals of the low-voltage arm unit, the partial voltage and current signals are fed back to the control unit for processing, parameters of the low-voltage arm unit are dynamically adjusted to maintain a stable partial voltage ratio, and the capacitance value of the high-voltage bushing is measured and monitored. By means of the device, the influence of high-frequency parameter changes on the high-voltage bushing can be quantified, and more accurate and stable online monitoring is achieved.

The embodiment of the utility model provides a power supply automatic switching circuit and an electric appliance, and relates to the technical field of electric appliances. The power supply automatic switching circuit comprises a rectification module, a voltage division module, a voltage comparison module, a switch module and a transformer. Two input ends of the rectifier module are used for connecting alternating current, and the voltage of the alternating current is one of at least two voltages; the first output end of the rectification module is connected with the first end of the voltage division module, the second output end of the rectification module is connected with the second end of the voltage division module, and the middle end of the voltage division module is connected with the first end of the voltage comparison module. The second end of the voltage comparison module is connected with a low-voltage power supply; the voltage of the low-voltage power supply is lower than that of the alternating current; the third end of the voltage comparison module is connected with the control end of the switch module; the switch module enables different coils of the transformer to be connected into a circuit according to signals of the voltage comparison module, and needed output voltage is obtained. MCU and software are not needed, the cost is low, and the response is fast.

This disclosure provides a receiving circuit and method for a single-wire bus signal, wherein the single-wire bus signal has a configurable high-level voltage and / or low-level voltage. The receiving circuit includes: a sampling module for receiving the single-wire bus signal and outputting a sampling voltage at a sampling voltage output terminal; a first signal generation module for generating a first signal based on the sampling voltage; a second signal generation module for generating a reference voltage based on the operating state of the single-wire bus and the sampling voltage; and a comparator for comparing the first signal and the reference voltage to generate a digital output signal corresponding to the single-wire bus signal. The operating state of the single-wire bus includes an idle state and a data transmission state. In the idle state, the sampling voltage is proportional to the high-level voltage, and the reference voltage is a first reference voltage, which is a predetermined voltage lower than the sampling voltage. In the data transmission state, the reference voltage is a second reference voltage, which changes with the sampling voltage starting from the first reference voltage.

The invention is suitable for the technical field of power grid control, and provides an isomerization direct current micro-grid control parameter calculation method and device, and the method comprises the steps: carrying out the equivalent processing of a target isomerization direct current micro-grid, and obtaining an equivalent converter model; calculating a current proportionality coefficient, a current integral coefficient, a voltage proportionality coefficient, a voltage integral coefficient and a droop coefficient of the equivalent converter model based on the equivalent converter model; and calculating a current control parameter, a voltage control parameter and a droop coefficient of the interleaved three-level DC / DC converter and a current control parameter, a voltage control parameter and a droop coefficient of the conventional two-level DC / DC converter based on the current proportionality coefficient, the current integral coefficient, the voltage proportionality coefficient, the voltage integral coefficient and the droop coefficient of the equivalent converter model. The problem that the control parameters of the isomerized direct-current micro-grid are difficult to calculate in the prior art can be solved.

The invention discloses a water management method of a coupling system based on a PEM water electrolysis module and an EHC module, and relates to the technical field of hydrogen energy. By controlling the optimal current density of the PEM electrolyzed water module, the content of water entering the EHC module is adjusted, so that the EHC module always operates in the optimal hydration state, and the overall efficiency of the system is improved. The method comprises the following steps: S1, establishing a relation model JPEM-r between the optimal current density of a PEM electrolyzed water module and the target pressure ratio of an EHC module; S2, obtaining the target pressure ratio of the EHC module; s3, according to the target pressure ratio of the EHC module, the optimal current density of the PEM electrolyzed water module is obtained through the JPEM-r relation model; and S4, adjusting the real-time current density of the PEM water electrolysis module to the target current density to realize water management of the EHC system. The invention further discloses a coupling system based on the PEM electrolyzed water module and the EHC module. The coupling system is used for improving the performance of the coupling system of the PEM electrolyzed water module and the EHC module.

The application discloses a reset pulse width adjustable Timer circuit and a driver, and realizes an effective method for adjusting the reset pulse width based on a CMOS process technology.The reset pulse width adjustable Timer circuit comprises a state indication module, a current source module, a charge and discharge module and a comparator module for realizing the adjustable pulse width.The source voltage comparison circuit can effectively determine the end time of the reset signal pulse by the comparison result of the comparison voltage and the threshold value of the Timer, so that the pulse width of the reset signal is adjustable, the precision of the Timer timing and resetting is greatly improved, the problem that the Timer may be abnormally stopped and the abnormal situation may be missed due to the fixed pulse width of the reset signal of the traditional Timer structure after the timing period is accumulated is solved, and the reliability and stability of the synchronous rectification driver in the isolated DC / DC power supply are improved.

The invention provides a CT energy-taking power supply circuit with self-adaptive output power, and relates to the technical field of power electronics, and the circuit comprises an energy-taking input protection module which is used for obtaining alternating current from a CT induction coil; the rectifying and filtering module is used for rectifying alternating current into pulsating direct current, and the pulsating direct current is smoothed by a filtering capacitor and then provides stable direct-current bus voltage for a post-stage conversion circuit; the DC-DC conversion module is used for efficiently converting the direct-current bus voltage into isolated direct-current voltage suitable for a load; the multi-stage adaptive feedback module is used for dynamically adjusting an output current reference through multi-stage voltage comparison and an optocoupler feedback network, so that the output power is adaptively matched with the CT energy taking size; and the direct current output module is used for rectifying and filtering the converted voltage and providing stable and low-ripple direct current output. According to the technical scheme, the output power is self-adapted according to the magnitude of the CT output electric energy, and the reliability and stability of power supply of the load equipment are improved.

The embodiment of the invention discloses an under-voltage protection circuit and a switching power supply. The under-voltage protection circuit comprises a controller which is set to control a current source circuit to work when the voltage of a second node is greater than a first voltage; when the voltage of the second node is smaller than or equal to the first voltage, the current source circuit is controlled not to work; when the current source circuit is set to work, current is pulled from the voltage comparison circuit through the first node; the voltage comparison circuit is set to output a first voltage to the second node when the voltage of the switching power supply meets a first condition; when the voltage of the switching power supply meets a second condition, a second voltage is output to the second node; the output control circuit is set to control the switching power supply to output outwards when the voltage of the second node is the first voltage; and when the voltage of the second node is the second voltage, controlling the switching power supply to stop external output. The under-voltage protection circuit and the switching power supply can realize reliable starting of the switching power supply.

The utility model provides a working state detection circuit and selling equipment, and relates to the technical field of automatic selling equipment, and the working state detection circuit comprises a sampling resistor module, a voltage amplification module and a voltage comparison module; a first end of the sampling resistor module is connected with a power supply loop of a detected object, a second end of the sampling resistor module is grounded, and the sampling resistor module is used for collecting working current of the detected object and converting the working current into detection voltage; the voltage input end of the voltage amplification module is connected with the first end of the sampling resistor module, the voltage output end of the voltage amplification module is connected with the voltage comparison module, and the voltage amplification module is used for amplifying the detection voltage and outputting the amplified detection voltage to the voltage comparison module; the voltage comparison module is used for determining the working state of the detection object based on the detection voltage. The circuit and the equipment provided by the utility model can be matched with track selling equipment and grid selling equipment at the same time.

This invention provides an air conditioner and its control method, control device, and readable storage medium. The air conditioner includes a fan and a microcontroller unit. The microcontroller unit has an analog voltage comparator. The control method includes: when the air conditioner is turned on, acquiring the current operating state of the fan; and determining, based on the current operating state of the fan, whether it is necessary to enable the analog voltage comparator. Acquiring the current operating state of the fan when the air conditioner is turned on allows for determining whether the analog voltage comparator needs to be enabled, avoiding the need to enable the analog voltage comparator when the air conditioner is in standby mode, thereby reducing the energy consumption of the air conditioner in standby mode.

To suppress an increase in power consumption during steady operation while preventing oscillation from stopping during the calibration of an LC oscillator. A calibration circuit includes a reference voltage generation unit, a voltage comparison unit, and an amplitude adjustment unit. The reference voltage generation unit generates a plurality of different reference voltages. The voltage comparison unit compares a detection value of an oscillation amplitude detected from an oscillation signal of the LC oscillator and the plurality of different reference voltages on the same polarity side of the oscillation amplitude. The amplitude adjustment unit adjusts the oscillation amplitude on the basis of a comparison result by the voltage comparison unit. The calibration circuit may include a frequency adjustment unit that adjusts an oscillation frequency of the LC oscillator.

The embodiment of the present application provides a wide voltage range voltage comparison circuit and a wide voltage range voltage processing circuit, the wide voltage range voltage comparison circuit comprises: an input voltage resistance module, which is used for receiving a first voltage and a second voltage, and converting the first voltage and the second voltage into a third voltage and a fourth voltage; a clamping voltage resistance module, which is used for receiving the third voltage and the fourth voltage, and obtaining voltage resistance protection through clamping when the accepted voltage is a high voltage domain, and outputting a first current and a second current; a first mirroring module, which is used for performing mirroring processing on the first current to obtain a third current; a second mirroring module, which is used for performing mirroring processing on the second current to obtain a fourth current; and an inverse output module, which is used for outputting a high or low potential according to the size of the third current and the fourth current. The first mirroring module, the second mirroring module and the input voltage resistance module improve the voltage output range and can amplify the current, and thus the wide range voltage signal comparison is realized.

We provide a multi-port interleaved charge pump bidirectional DC-DC converter that allows multiple ESSs to be connected to a DC microgrid system with a single bidirectional DC-DC converter. [Solution] The system comprises two two-phase interleaved charge pump bidirectional DC-DC converters, three charge pump capacitors, and a drive circuit that controls each switch of the DC-DC converters. The negative terminals of the two DC-DC converters are common-connected, the low-voltage sides of the two DC-DC converters are connected to two different low-voltage DC voltage sources, the high-voltage sides of the two DC-DC converters are multiple-connected, and the inductors that constitute the interleaved system but are not connected to the charge pumps are connected to the connection point via three charge pump capacitors and connected to one high-voltage DC voltage source.

The present invention relates to a method and system for identifying the wiring configuration and voltage rating of an electricity meter. The method involves measuring various voltage values, including phase and line voltages, relative to a virtual neutral point. A controller calculates effective values and phase angles from the measured voltages and performs a multidimensional analysis, including voltage ratio analysis, phase angle analysis, and zero-sequence voltage analysis, to determine the wiring configuration, such as a three-phase three-wire or three-phase four-wire configuration. The method also incorporates a voltage spectrum analysis, utilizing a Fast Fourier Transform (FFT), to determine the voltage rating. Multiple iterations of the identification process are performed to confirm the accuracy of the results. The system includes a voltage measurement unit, a processor, and a memory for executing the method. The invention improves reliability in wiring configuration identification and enables anomaly detection.

The utility model relates to a comprehensive monitoring system for a pump station. The comprehensive monitoring system comprises a rectifier transformer, a first power management module, a second power management module, a water pressure sensor, a first voltage comparator, a signal amplifier and an electric control switch module, a water pressure sensor is used for collecting water pressure of a community water supply pipe to output water pressure detection voltage; when the water pressure of the community water supply pipe is higher than the preset water pressure value, the water pressure detection voltage is higher than the first reference voltage, and the first voltage comparator outputs low-level voltage; when the electric control switch module is cut off, the pump station motor is powered off and stops working; when the water pressure of the community water supply pipe is lower than or equal to a preset water pressure value and the water pressure detection voltage is lower than first reference voltage, the first voltage comparator outputs high-level voltage; the electric control switch module is switched on, the pump station motor is powered on to start working, the water pressure of the community water supply pipe is improved under operation of the pump station motor, and therefore the working state of the pump station is automatically controlled according to the water pressure of community water supply, and energy waste of the pump station is reduced.

An ideal diode circuit comprises a transistor, a low-voltage reference module, an ultra-low-voltage power supply module and a voltage drop detection circuit, the low-voltage reference module provides three different reference voltages and bias voltages, the ultra-low-voltage power supply module adopts N charge pumps in series to step up the voltage drop of the transistor, and outputs a control voltage Vcp to supply power for the internal circuit of the ideal diode, the voltage drop detection circuit compares the voltage drop of the transistor with the three reference voltages through comparators respectively, controls the opening or closing of the charge pump of the ultra-low-voltage power supply module, and realizes adaptive variable amplification multiple step-up of the voltage drop VIN-VOUT. The ideal diode control technology provided by the application utilizes variable charge pump amplification multiple, provides adaptive adjustment of the amplified voltage, and meets the continuous and stable operation of the circuit in the working voltage range of the ideal diode.

The invention discloses a discharge indicating device with an audible and visual alarm function and a use method, and belongs to the technical field of electric power inspection and maintaining.The discharge current on a discharge grounding wire is collected through a collection unit, the collected current amount is converted into voltage amount through a comparison unit, the voltage amount is compared with a set comparison value, and when the discharge current is larger than the set value, the audible and visual alarm function is given out. When the discharge current is smaller than a set value, the comparison unit outputs voltage, and when the discharge current is smaller than the set value, the comparison unit does not output voltage, and the output voltage of the comparison unit is amplified through the amplification unit to drive the acousto-optic unit to give an acousto-optic alarm to prompt that a discharged object has residual voltage. The problems that in the prior art, the discharging condition cannot be mastered, and it cannot be guaranteed that a test object is reliably discharged are solved; the discharge reliability is ensured through sufficient time, a large amount of working time is consumed, and the working efficiency is reduced; and potential safety hazards are caused to personnel and test equipment due to insufficient discharge.

The application provides an asymmetric short-circuit current calculation method and system for large-scale new energy stations, and the method comprises the following steps: judging a fault type and a fault phase; constructing a fault composite sequence network; calculating negative sequence impedance of each new energy station, and calculating positive sequence initial voltage of each new energy station; calculating output short-circuit current of each new energy station; obtaining a simplified equivalent circuit through circuit simplification according to the fault composite sequence network; calculating positive sequence voltage of each new energy station; comparing the positive sequence voltage of each new energy station with the positive sequence initial voltage, judging whether a voltage difference meets convergence accuracy, solving output negative sequence current and zero sequence current of each new energy station according to a circuit equation; and outputting output phase current of each new energy station. The application overcomes the influence of a converter control on a phase selection element, can effectively shorten the iteration number, avoids the process of solving matrix inverse operation by using a node voltage method, has good engineering practicability and precision, and can be applied to large-scale new energy stations.

A multi-die module includes: a first semiconductor die having an internal line, an external electrode, and multiple internal electrodes and including a first control circuit that control a DC-DC converter; a second semiconductor die having multiple internal electrodes and including a second control circuit that controls a linear regulator; and a package that supports the first and second semiconductor dies. The second control circuit includes a voltage comparison circuit having a feedback input, a reference input, and a comparison output. In each of the first and second semiconductor dies, the multiple internal electrodes includes a first internal electrode. The feedback input of the voltage comparison circuit is connected to the first internal electrode of the second semiconductor die, which is connected to the first internal electrode of the first semiconductor die. The internal line connects the first internal electrode of the first semiconductor die to the external electrode.

A motor overcurrent protection circuit relates to the field of pan-tilt control, and when a pan-tilt motor is overloaded or stalled, the current flowing through a resistor I in the circuit is increased, the voltage drop on the resistor I is increased accordingly, the voltage at the positive input end of a voltage comparator is greater than the voltage at the negative input end of the voltage comparator, the voltage comparator outputs a high level, and a triode is conducted to conduct a PMOS tube. The alarm unit sends out alarm information to remind workers of timely processing. And if the field staff does not arrive, the voltage output by the output end of the voltage comparator triggers the control electrode of the thyristor, the thyristor is conducted, the power supply circuit of the pan-tilt motor is cut off, and the pan-tilt motor stops rotating. The internal circuit of the pan-tilt motor is effectively prevented from being burnt, and the service life of the pan-tilt is prolonged.

This utility model discloses a switching device, including a voltage comparison module electrically connected to an induction amplifier module, a water pump, and a power supply component. The power supply component supplies power to the power supply component, voltage comparison module, induction amplifier module, and water pump. The induction amplifier module senses the alternating electric field of the outdoor unit of the air conditioner and generates induced current and voltage. The voltage comparison module receives the signal from the induction amplifier module and controls the start and stop of the water pump. The beneficial effects of this utility model are that the induction amplifier module can determine whether the outdoor unit of the air conditioner is powered on and transmits the induced electrical signal to the voltage comparison module. The voltage comparison module compares the received signal voltage with a reference voltage to determine whether to supply power to the water pump. Furthermore, an alarm component can determine whether the water pump has malfunctioned and provide a buzzer warning. This device can automatically add or stop water supply based on the start and stop status of the outdoor unit of the air conditioner, thereby saving energy and water resources.