DC-DC converter schematic diagram
Source: InternetPublisher:qoistoochee128 Keywords: DC-DC converter BSP Updated: 2020/08/16
Figure 48-12V DC-DC converter schematic diagram
working principle:
The picture below is based on the physical analysis. The power supply provides a voltage of about +12V to IC 1 through D2 and R1. The 6-pin output pulse is coupled with C4 and the transformer to drive Q1 to oscillate. When Q1 is turned on, the output current passes through L and is filtered by C9. Power is supplied to the load backward. When Q1 is cut off, the magnetic energy of the transformer-type inductor B3 is converted into electrical energy. Its polarity is negative on the left and positive on the right. The freewheeling diode D4 is turned on, and the current continues to supply power to the load through the diode, so that the load receives a smooth DC. When the output voltage is too low or too high, the sampling voltage is obtained from the voltage dividing circuit composed of resistors R11, R10, and R9 and sent to pin 2 of IC1. After comparing it with the internal 2.5V reference voltage, the Q1 conduction pulse width is controlled, so that the output voltage is Stablize. When the load current is short-circuited or exceeds 8A, the rise in the voltage at pin 3 of IC 1 will control the pulse width to cut off Q1 to ensure the safety of Q1.
C8 and R7 constitute the oscillation time constant. The oscillation frequency of this circuit is 65KHz. Its calculation formula is as follows:
- Schematic diagram of car cigarette lighter to USB power port
- In-depth analysis of DC-AC converter inverter
- Practical and convenient fax machine power supply control circuit
- Lithium battery overcharge, over discharge, short circuit protection circuit design
- ISO113 circuit that can reduce power consumption
- Use pulse width modulation to get a precise output voltage
- Detailed explanation of 5v charger circuit diagram
- Dynamic power supply for power amplifier controlled by thyristor
- LM317 regulated power supply
- Converting a lithium battery charging board into a constant voltage and current charger
- Homemade disinfectant circuit
- High-efficiency speaker circuit for rural stage
- Fish pond oxygenation reminder circuit
- Egg warming circuit
- Farmland irrigation automatic control circuit a
- Amplitude modulation circuit composed of MC1496
- Wien bridge oscillator circuit
- Second-order active band-stop filter circuit
- Wireless microphone circuit
- Sawtooth wave generator circuit (1)