Research on High Stability Thyristor in Steady Current Power Supply -Lithium - Ion Battery Equipment
.i Heavy Ion Research Facility Overview The Heavy Ion Research Facility (HIRF) is a large plastic core physicist designed and built by my country.
3 Ripple ring Since the bridge port voltage has low-frequency ripples of 50Hz, 100Hz, and 150Hz, it is difficult to suppress c. It must be detected by frequency selection and negatively fed back to the voltage regulator to make the power supply ripple smaller and meet our requirements. Therefore, we choose a band-pass filter. The band-pass filter can pass the signal in a frequency band roughly centered on the center frequency and have a bandwidth of /5, while attenuating all other frequency signals. When the center frequency is used /.=0/ 27: (unit is Hz) means, / also uses Hz as the unit, the ratio is the quality factor of the filter, which can be used to measure the selectivity of the filter, for example, a high value indicates a filter with high selectivity. In order to better select the frequency we need, a two-stage series band-pass filter is adopted, and then amplified by the amplifier A3, and the magnification can be adjusted by a ruler 54.(Lithium - Ion Battery Equipment)
=1.2834V. Using LC passive filtering method, if the ripple voltage requires 2xUT5, then the amplification factor must be 534 times.
=3.76<1-5. We use passive filtering, select the capacity of the capacitor according to the size of the inductance, fln is the row resistance, and form a low-pass filter with Cl4 and the previous passive filter to pass the signal below 300Hz, while Signals above 300Hz are filtered out. The circuit is as shown.
The stability of the power supply reaches ±1x105/8h, reaching the domestic leading level. The circuit is as shown.
Active filter Passive filter 5 Active filter The power supply is rectified by a 12-wave thyristor, which in theory has a characteristic harmonic of 600Hz. However, due to the unbalance of the three-phase power grid, the fluctuation of the trigger angle of the thyristor will Low-order harmonics with a frequency lower than the characteristic harmonics are generated. For higher-frequency harmonics, passive filtering can attenuate them. However, these low-order harmonics such as 50Hz, 100Hz, and 150Hz cannot. In order to attenuate low Subharmonics, active filtering is designed. The ripple voltage is detected by the frequency selection circuit, and then the power of the ripple voltage is amplified to eliminate the ripple voltage in the output voltage. The reactance converter (L3) plays the role of isolation, and at the same time through the potentiometer, /4 can adjust the size of the output power to the reactance converter. This design method is very well applied in the development of MI2 power supply. Only 6 regulators use high-stability integrated circuits, select proportional integrals, and fi8 and c8 of proportional integrals are related to the response time of the entire system. According to different load characteristics , will use different values of C8 and c8, 'too large, easy to oscillate, and too small, will affect the triggering of the thyristor or affect the stability of the power supply, if c8 is too large, the response time will be too long, affecting the automatic adjustment of the power supply, so that Eventually the power supply regulation drifted out of the desired range.
According to the long-term adjustment, finally selected =147k, c8=8/laF. The given reference and the feedback signal of the shunt are connected in series, and the signs are opposite. The network composed of i6 mainly suppresses the characteristic harmonics so that the regulator can work stably. The /1Q and C9 parameters of the voltage inner loop should be as small as possible, and the circuit is shown as shown.
The shunt reference 7 technical indicators use 8.5-digit 7081 digital voltmeter, the sampling time is 51.2 seconds, continuous recording for 8 hours, a total of 563 values, remove the maximum value that only appears once and the minimum value that only appears once, and use the formula to calculate current stability. The current stability is better than ±1 (T5. The current stability curve is as shown.
Use the GST668A meter to measure the power supply, the efficiency is better than 90%, the power factor is greater than 0.9, the current AC ripple is less than 5xl06, and the harmonic component of the primary side of the rectifier transformer is measured by the GXF-908A multifunctional power harmonic analyzer. 3%, fully in line with national standards.
8 Conclusion For such a high-power and high-stability power supply, this circuit design is feasible, and its technical indicators such as stability are ideal. Since it was put into continuous operation in October 2000, its reliability has been proved to be very good. Power Retrofit Success provides a complete experience for retrofit or new build of similar power supplies.
3 Ripple ring Since the bridge port voltage has low-frequency ripples of 50Hz, 100Hz, and 150Hz, it is difficult to suppress c. It must be detected by frequency selection and negatively fed back to the voltage regulator to make the power supply ripple smaller and meet our requirements. Therefore, we choose a band-pass filter. The band-pass filter can pass the signal in a frequency band roughly centered on the center frequency and have a bandwidth of /5, while attenuating all other frequency signals. When the center frequency is used /.=0/ 27: (unit is Hz) means, / also uses Hz as the unit, the ratio is the quality factor of the filter, which can be used to measure the selectivity of the filter, for example, a high value indicates a filter with high selectivity. In order to better select the frequency we need, a two-stage series band-pass filter is adopted, and then amplified by the amplifier A3, and the magnification can be adjusted by a ruler 54.(Lithium - Ion Battery Equipment)
=1.2834V. Using LC passive filtering method, if the ripple voltage requires 2xUT5, then the amplification factor must be 534 times.
=3.76<1-5. We use passive filtering, select the capacity of the capacitor according to the size of the inductance, fln is the row resistance, and form a low-pass filter with Cl4 and the previous passive filter to pass the signal below 300Hz, while Signals above 300Hz are filtered out. The circuit is as shown.
The stability of the power supply reaches ±1x105/8h, reaching the domestic leading level. The circuit is as shown.
Active filter Passive filter 5 Active filter The power supply is rectified by a 12-wave thyristor, which in theory has a characteristic harmonic of 600Hz. However, due to the unbalance of the three-phase power grid, the fluctuation of the trigger angle of the thyristor will Low-order harmonics with a frequency lower than the characteristic harmonics are generated. For higher-frequency harmonics, passive filtering can attenuate them. However, these low-order harmonics such as 50Hz, 100Hz, and 150Hz cannot. In order to attenuate low Subharmonics, active filtering is designed. The ripple voltage is detected by the frequency selection circuit, and then the power of the ripple voltage is amplified to eliminate the ripple voltage in the output voltage. The reactance converter (L3) plays the role of isolation, and at the same time through the potentiometer, /4 can adjust the size of the output power to the reactance converter. This design method is very well applied in the development of MI2 power supply. Only 6 regulators use high-stability integrated circuits, select proportional integrals, and fi8 and c8 of proportional integrals are related to the response time of the entire system. According to different load characteristics , will use different values of C8 and c8, 'too large, easy to oscillate, and too small, will affect the triggering of the thyristor or affect the stability of the power supply, if c8 is too large, the response time will be too long, affecting the automatic adjustment of the power supply, so that Eventually the power supply regulation drifted out of the desired range.
According to the long-term adjustment, finally selected =147k, c8=8/laF. The given reference and the feedback signal of the shunt are connected in series, and the signs are opposite. The network composed of i6 mainly suppresses the characteristic harmonics so that the regulator can work stably. The /1Q and C9 parameters of the voltage inner loop should be as small as possible, and the circuit is shown as shown.
The shunt reference 7 technical indicators use 8.5-digit 7081 digital voltmeter, the sampling time is 51.2 seconds, continuous recording for 8 hours, a total of 563 values, remove the maximum value that only appears once and the minimum value that only appears once, and use the formula to calculate current stability. The current stability is better than ±1 (T5. The current stability curve is as shown.
Use the GST668A meter to measure the power supply, the efficiency is better than 90%, the power factor is greater than 0.9, the current AC ripple is less than 5xl06, and the harmonic component of the primary side of the rectifier transformer is measured by the GXF-908A multifunctional power harmonic analyzer. 3%, fully in line with national standards.
8 Conclusion For such a high-power and high-stability power supply, this circuit design is feasible, and its technical indicators such as stability are ideal. Since it was put into continuous operation in October 2000, its reliability has been proved to be very good. Power Retrofit Success provides a complete experience for retrofit or new build of similar power supplies.
