The system is running at less than optimal gain state, so light load conversion efficiency at light load conditions will also fall

The maximum inductance to satisfy this condition can be obtained from the following equation: When the drive circuit 600 volt fluorescent light, the efficiency curve of a multilayer PZT has a push-pull topology. When the input voltage is low, the conversion efficiency is higher than 85%; at high input voltage, the conversion efficiency decreases with the decrease in gain of PZT. Magnetic and  circuit breakers , the linear approach to reducing the fluorescent lamp dimming to reduce work efficiency. In the magnetic circuit of the transformer, the loss due to the circulating current in the resonant circuit with the generated electric current  mcb circuit breaker  the fluorescent lamp and maintain independent constant, the decrease in the conversion efficiency at light loads. In PZT circuit, since the system is running under light load conditions below the optimum gain state, the light load  Voltage stabilizer  efficiency will fall. Light load efficiency of these two circuits can be improved using pulse dimming technology. This method can visually sensed higher than the frequency modulation of the duty cycle by on / off control the average current of the fluorescent lamp, the fluorescent lamp working at full load current.

Magnetic transformer circuit, the circuit frequency of the PZT-based, rather than the current duty cycle to control the fluorescent lamp

Magnetic transformer circuit , the circuit frequency of the PZT -based , rather than the duty cycle to control the fluorescent lamp . UCC3977 between the COMP pin with a pin and OSC formed programmable voltage controlled oscillator. The VCO operating frequency range for the system settings , the frequency range of the excitation frequency must PZT and the normal operating frequency is included . FB pin fluorescent lamp  electric meter  , and through PZT gain versus frequency characteristics can be controlled. PZT gain  electri cenergy meter  to be able to provide the minimum input voltage at the fluorescent lamp voltage, in order to ensure the control loop is always in the right side of the resonance . Work waveform push-pull circuit. N1 and N2 at 50% duty cycle is driven to generate the phase shift. Inductor L1 and L2  Circuit breaker  PZT primary capacitance , drain the N1 and S2 form a half sine wave. In the PZT voltage obtained across the primary near sinusoidal . Fluorescent voltage close to 600 volts in this application . Since the ceramic transformer has a high Q value, the voltage of the fluorescent lamp is a sine wave . To achieve zero- voltage switching , the drain voltage of the next switching cycle must return to zero before. This requires that the LC resonance frequency must be higher than the switching frequency.

The voltage gain of the transformer secondary winding through the turns ratio between the primary coil and

The voltage gain of the transformer can be determined by the turns ratio N2/N1 between the primary coil and the secondary coil of the transformer and the current gain is also related with N1/N2. In the design of the circuit for CCFL transformer primary inductance of the primary and turns the external capacitor resonant circuit formed by the transformer needed to decide. Secondary turns should be guaranteed to start  electric meter  lamps provide a high enough voltage. Secondary turns usually require high magnetic core has a large window area. As the high pressure primary and secondary isolation requirements between duty, CCFL transformer  Air circuit breaker  usually higher. This transformer is used as a sine wave, which only reduces the effective  Voltage stabilizer  of the turns ratio, and no switching spikes. Other problems associated with magnetic transformers also include the need to shield stray magnetic fields, as well as the potential arc fault condition at the time of the next level voltage control generated.

Magnetic transformer may be thicker, heavier and more inefficient

For the next generation of portable fluorescent display enclosure and become thinner , therefore , creates a demand for thin CCFL power supply . Thanks to the development of magnetic ceramic piezoelectric transformers and transformer , we can create a more efficient , smaller backlight converter. Select the transformer depends on the cost , size and efficiency , and several other factors . For example , at a given power level lower than the piezoelectric transformer , the transformer may be magnetic thicker , heavier and less efficient , but it also has a greater load range and a lower cost advantage . For the PZT transformer , the operation of the sine of its inherent characteristics . In addition, it has a high excitation voltage , non-flammable and non- electromagnetic noise , etc. . A transformer for example 3-4W laptop . About the high-frequency magnetic transformer transformer works by a  mcb circuit breaker  core and a plurality of coils wound on the composition . Transitions occur between the energy flux and the magnetic core. This energy exchange is a function of current and voltage of the integral : Energy = ∫ I Vdt = ∫ H dB change in flux density in the core can be used and the field intensity is expressed ; current in the coil can also be used , to express the change of voltage and time . The magnetic flux density and V - second proportional and  power transformers  to the number of turns of the coil and the core cross-sectional area . Calculated according to Faraday 's law : current and number of turns is proportional to the intensity and the field , and inversely proportional to the length of the coil . According to Ampere 's law , it can be expressed as : The relationship between the flux density and field strength determined by the magnetic permeability of the core ;

Mine vacuum electromagnetic starter coal mine power supply system is the key equipment

Mine vacuum electromagnetic starter is one of the key equipment in coal mine power supply system, it directly affects the reliability and safety of coal power production system, so the development of high  Voltage stabilizer  electromagnetic starter has a very important  Circuit breaker . In the development of multi-loop vacuum mining electromagnetic starter controller, enabling multiple combinations of mine control and protection of large two-speed or single speed motor. Mine development and current  mcb circuit breaker  electromagnetic starter. For motor overload protection established motor heating, cooling mathematical model, proposed the use of software to simulate the temperature rise of the protection methods; analyzing the characteristics of small ground fault currents based on the application of the principle of zero sequence power direction herein Select grounded branch; addition, overvoltage, undervoltage were analyzed and the corresponding protective measures. According to the site conditions, determine the control mode controller, developed a general scheme of the controller.

With the development of mechanical and electrical industry, electricity systems are becoming increasingly complex

With the development of mechanical and electrical industry, electrical systems become more complex, the traditional contactor or starter demanding. In order to meet the electricity  air circuit breaker , intelligent demand, electrical factory in developed countries with a wide use of computer technology to develop multi-functional. Intelligent, high-performance, high-reliability magnetic contactors and electromagnetic starter. Its main feature is mechatronics, computer technology will be introduced  mcb circuit breaker  control appliances, on the one hand to meet the requirements of the basic functions of traditional appliances, on the other hand the control of intelligent appliances, in particular, can increase the variety of functions, such as protection monitoring communication function, can be used for the separation of electricity network system components.