Every product cannot be perfect. There is always a bad side. Here are some of the shortcomings of Switching Power Supply Co., Ltd. for you:
The drawback of switching regulated power supplies is the presence of severe switching disturbances. In a switching regulated power supply, a power adjusting switching transistor is operated in a switching state, and the communication voltage and current that it generates are disturbed and disturbed by other peak components in the circuit. These disturbances do not adopt a certain method to suppress, eliminate, and shield. It will severely affect the normal operation of the whole machine. In addition, because the switching power supply vibrator is not blocked by the power frequency transformer, these disturbances will be connected to the power frequency grid, causing serious disturbances to other nearby electronic devices, equipment, and home appliances.
At present, because domestic microelectronics skills, resistance to the production of container materials, and magnetic data technology are still at a certain distance from advanced countries with advanced skills, the cost cannot be reduced further, and it also affects the further progress of reliability. Therefore, in China's electronic instruments and electromechanical integration instruments, switching power supply can not be widely used and used. In particular, it is still in the midst of research and development in China for equipment such as high-voltage electrolytic capacitors, high-voltage high-voltage switchgears, and switching transformers, which are not used in power-frequency transformer switching power supplies. In some countries with advanced skills, although the steady-state switching power supply has certain development, there are still some problems in practical use, and it is not very satisfactory. This exposes yet another drawback of the switched-mode regulated power supply. That is, the circuit structure is disorderly, the failure rate is high, and repairs take time. In this regard, if designers and manufacturers do not give sufficient attention, it will directly affect the promotion of the use of switching power supply. Today, the main reason for the difficulty of promoting the use of switching regulated power supplies is that it is difficult to make its manufacturing skills, repair costs and higher cost.
In the switching power supply currently on the market, a switching frequency of 100 kHz made of a bipolar transistor is selected, and a switching frequency of 500 kHz is made using a MOS-FET. An outstanding defect of switching power supplies is the occurrence of strong EMI. The EMI signal has both a wide frequency range and certain fluctuations. Conduction and radiation can contaminate the electromagnetic environment and cause disturbances to communication equipment and electronic products. If it is not handled properly, the switching power supply itself becomes a source of disturbance. When using the switching power supply as the input VIN of the LDO, pay attention to the LDO power ratio and power consumption.
The power supply ratio is a communication parameter that the output LDO outputs to the input ripple according to the capacity. Usually the output and input frequencies are the same. The larger the PSRR value, the stronger the ripple capability of the LDO, ie the input to the output. The impact is small. Although the LDO's power supply is very strong in terms of turns ratio, it is very strong in the required frequency. Normally, the power supply from 50KHz to 200kHz is still very poor, and this frequency is just the operating frequency of most switching power supplies. If the LDO's load does not match the input/output capacitance, it will simply cause the LDO to vibrate. The formation of all LDO power supply system instability.
Most of the switching power supplies currently on the market are fixed voltage outputs, usually 5V output, and the most commonly used LDO is 3.3V output. When the output of the switching power supply is used as the input of the LDO, There is a large pressure difference of 1.7V. If the LDO current is large, such as 200mA, then the chip's temperature will be very high, power consumption is very large, long-term operation in the case of high temperatures, will affect the chip's operating life.
Hexie Industrial (Shanghai) Co., Ltd. specializes in R&D, production and sales of instrumentation. It is a high-tech enterprise integrating production and sales.
The drawback of switching regulated power supplies is the presence of severe switching disturbances. In a switching regulated power supply, a power adjusting switching transistor is operated in a switching state, and the communication voltage and current that it generates are disturbed and disturbed by other peak components in the circuit. These disturbances do not adopt a certain method to suppress, eliminate, and shield. It will severely affect the normal operation of the whole machine. In addition, because the switching power supply vibrator is not blocked by the power frequency transformer, these disturbances will be connected to the power frequency grid, causing serious disturbances to other nearby electronic devices, equipment, and home appliances.
At present, because domestic microelectronics skills, resistance to the production of container materials, and magnetic data technology are still at a certain distance from advanced countries with advanced skills, the cost cannot be reduced further, and it also affects the further progress of reliability. Therefore, in China's electronic instruments and electromechanical integration instruments, switching power supply can not be widely used and used. In particular, it is still in the midst of research and development in China for equipment such as high-voltage electrolytic capacitors, high-voltage high-voltage switchgears, and switching transformers, which are not used in power-frequency transformer switching power supplies. In some countries with advanced skills, although the steady-state switching power supply has certain development, there are still some problems in practical use, and it is not very satisfactory. This exposes yet another drawback of the switched-mode regulated power supply. That is, the circuit structure is disorderly, the failure rate is high, and repairs take time. In this regard, if designers and manufacturers do not give sufficient attention, it will directly affect the promotion of the use of switching power supply. Today, the main reason for the difficulty of promoting the use of switching regulated power supplies is that it is difficult to make its manufacturing skills, repair costs and higher cost.
In the switching power supply currently on the market, a switching frequency of 100 kHz made of a bipolar transistor is selected, and a switching frequency of 500 kHz is made using a MOS-FET. An outstanding defect of switching power supplies is the occurrence of strong EMI. The EMI signal has both a wide frequency range and certain fluctuations. Conduction and radiation can contaminate the electromagnetic environment and cause disturbances to communication equipment and electronic products. If it is not handled properly, the switching power supply itself becomes a source of disturbance. When using the switching power supply as the input VIN of the LDO, pay attention to the LDO power ratio and power consumption.
The power supply ratio is a communication parameter that the output LDO outputs to the input ripple according to the capacity. Usually the output and input frequencies are the same. The larger the PSRR value, the stronger the ripple capability of the LDO, ie the input to the output. The impact is small. Although the LDO's power supply is very strong in terms of turns ratio, it is very strong in the required frequency. Normally, the power supply from 50KHz to 200kHz is still very poor, and this frequency is just the operating frequency of most switching power supplies. If the LDO's load does not match the input/output capacitance, it will simply cause the LDO to vibrate. The formation of all LDO power supply system instability.
Most of the switching power supplies currently on the market are fixed voltage outputs, usually 5V output, and the most commonly used LDO is 3.3V output. When the output of the switching power supply is used as the input of the LDO, There is a large pressure difference of 1.7V. If the LDO current is large, such as 200mA, then the chip's temperature will be very high, power consumption is very large, long-term operation in the case of high temperatures, will affect the chip's operating life.
Hexie Industrial (Shanghai) Co., Ltd. specializes in R&D, production and sales of instrumentation. It is a high-tech enterprise integrating production and sales.
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