The cost of the DC converter is much lower than that of the inverter. In many places, DC converters can be used to replace inverters, such as mobile phone chargers, satellite receivers, and laptop computers in cars. If the output of the DC converter is designed to be DC 300V, it will be consistent with the 220V AC voltage after rectification and filtering .
The circuit is shown in Figure 1. The core component of the circuit is the pulse width modulation control chip TL494CN, which is an integrated circuit for switching oscillation and stabilization control. Its 9-brand and 10-pin output switch pulses with opposite phases. Respectively resist VT1--VT4. When pin 10 is a positive pulse, VT1 ends. VT3 is on, VT2 is on, and VT4 is off. When pin 9 is a positive pulse, VT2 is off and VI4 is on. The high-frequency voltage that is widely turned on is generated in the secondary of the variable instrument, and then the bridge rectification and filtering become about 300V DC high-meter output. The 1 pin, 16 pin, 2 pin, 15 pin of the integrated circuit TL494CN are the phase input and the inverting input of the two comparators inside the integrated circuit. These two comparators of Lizhou realize the over-temperature protection and over-meter protection of the circuit.
Since the communication power supply has a power supply system that collects grounding, the requirements for the ungrounded system of the DC operating power supply and the DC of the power supply module of the DC converter are completely isolated from the electrical equipment, and this is a fault on the side of the DC output load. Neither will cause grounding on the DC input side and the self-current input side. Since the power transmission of the DC converter cancels the battery pack, the application of the power module for the DC converter must have a small load impact energy, so that it can meet the cold start and negative surge impact requirements of Tongshen equipment . For DC converters, since the hardware technology used by the power module is a common mainstream technology, it is the basis for ensuring the normal power supply of the system 1: It can also further realize the convenient management of the power supply, so as to realize the power system can continue to operate." Capacity. The requirements for converting the various items output by the DC converter power supply module must meet the relevant requirements of the current power supply technical standards.
Application of Z source network in SEPIC circuitWhen the full control device is turned on, the capacitors C1, C2, and C3 are in the discharge state, and the energy stored in L1, L2, and L3 is respectively stored through VT, and the internal electric field energy is converted into magnetic field energy and stored in the inductor. The inductors L1, L2 and L3 are in the state of energy storage, and the currents 11, 12 and 13 flowing through are linearly rising, and the voltage at both ends, and the direction of the voltage are positive, so that the cathode potential of the diode D1 rises, and D1 undergoes a reverse voltage drop. When cut off, the input power U is cut off, the anode potential of the diode D2 is reduced, and D2 is also cut off due to the reverse voltage drop. At this time, the capacitor C0 is in a discharged state and supplies power to the load R.
The Z-source network is applied to the traditional DC-DC DC converter to carry out a new topology, and it is concluded that the DC converter based on the Z-source network has the advantages that the traditional DC converter does not have. Compared with the pure copper DC The buck-boost range of the converter is improved, and the conduction ratio is always less than 0.5. In the dual-loop control, the current inner loop obviously does not need slope compensation, and the switch conduction time of the main switch is short, and the switch cut-off time is long, which is good for heat dissipation, simple topology, and increase The number of components is small, and the cost increases little.
Related links briefly describe the role of the pwm converter, what is the principle of the DC PWM converter and the DC PWM converter
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