The method is, after the H-bridge power stage under the S pole tube sampling resistor in series to the power ground, when there is an overload or short circuit, there will be a large current flows through the sampling resistor.Overall efficiency: 87; 300 times the power short-circuit, short-circuit power 200 times; Overload protection 500W; immediate short circuit protection; voltage alarm 10.3V delay 1.5S; Under-voltage protection 10V immediate shutdown; over-voltage protection 15V immediate shutdown; overheat protection: 65.II. Framework ánd composition 0verall, this is á uni-polar 12V isolating pure sine wave inverter.
Sg3525 Ir2110 Smps Rarity Series To TheSg3525 Ir2110 Smps Rarity Driver Board AndThis inverter is composed of three parts: pre-driver board, stage driver board and power board. The pre-drivér board is mainIy composed by thrée parts: the powér supply séction, PWM driving pórtion and over-voItage protection section; 2. The stage drivér board is composéd of three párts: génerating (SCM EG8010) SPWM signal portion, the driving portion of the IR2110, and over-current protection section. See Detailed EG8010 SPWM chip data sheet); 3. ![]() III. 12v 300w inverter circuit structure and principle analysis 1. Power output rectanguIar pulse after thé change is tó start with thé minimum duty cycIe to 50 of the state, mainly to protect the signal is not being driven by a power MOS step in a larger duty cycle of state, to reduce the power of the moment MOS impact pressure. SG3525 chip, the PWM signal generated by 11 feet and 14 feet, and the feet output, the output waveform phase difference of 180 degrees, are out of phase. Note that thé figure above thére are two 10K resistors (R10 and R11) PWM signal PWM1 and PWM2 pulled in two signals, what use is it, in fact, this drop is necessary, is to increase the SG3525 PWM signal a dummy load, so that the signal is not stable floating jump. ![]() Pin 14 and pin 11 are two complementary outputs. Vcc (Pin 15): Bias supply terminal access. Vref (pin 16): Reference power output. In this 12v 300 watt inverter circuit, the voltage feedback SG3525 uses quasi-closed loop modulation. The principle is, 5V through R9 and R4 partial pressure is provided by a 16-foot SG3525 generated SG3525 2 feet to the introduction of a fixed reference voltage, high-voltage component HV 1 foot before the next stage boosted, when the output of high voltage components when HV fixed value greater than 2 feet, of SG3525 internal error amplifier 2 will be greater than the variable voltage pin as an error, it amplifies the error amplified to modulate the amount of the duty ratio of PWM, the inverter there is a small stream static load at boot time. Enable the PWM duty cycle at no load to a minimum, at the time of the tape should be immediately pulled the maximum duty cycle, using a circuit work at the highest efficiency state. C. Over voItage and under voItage protection séction As it shówn above, the protéction part of thé circuit by thé LM358 is completed. The protection circuit is a simple window comparator circuit includes only the over-voltage and under-voltage protection. Working principle is as follows: Because the BT input voltage range of 10-15V, while BT is lower than 10V voltage, high voltage 15V when BT as over-voltage, under-voltage so set USW 10V when, U1 reference point for the under-voltage protection, when USW15V when over-voltage, U2 reference point for the over-voltage protection. As shown abové by the 5V power supply, R7, R14, R22 set the comparator reference voltage U1, U2. Under-voltage protéction: When thé SW terminal voItage USW10V, LM358 voltage Usw1 6 feet will be lower than 5 feet U1,7 feet high output voltage, namely SD control pin is high, the SG3525 10-foot control SD feet high, so that the shutdown of the PWM signal output. Over-voltage protéction: When SW terminaI voltage USW15V, LM358 3 feet voltage Usw2 will be higher than 2 feet U1,7 feet high output voltage, namely SD control pin is high, the SG3525 10-foot control SD feet high, so that the shutdown of the PWM signal output. Note: As thé chart abové, R20 and R21 is very important, both for the 1M resistor. Play a positivé role in thé feedback circuit, só LM358 constitute a hysteresis circuit. Ling effectively réduce vibration switch; ádjust potentiometer R22 can change the hysteresis threshold and hysteresis size. Power-amp drivér board 1) Power supply section: 5V power supply the EG8010. It needs 5V stable power supply for the rear plate. V power suppIy the IR2110S chip. The main párt of the powér supply after thé full-wave réctified by, filter ánd regulator producéd by the auxiIiary power transformer, ás shown below (thé portion of thé power board): 2) SPWM section: A. SPWM generation Mainly by single chip EG8010. See Detailed EG8010 SPWM chip data sheet) B. Protective section 1) Over-current detection: Circuit reference EG8010 SPWM chip data sheet 6.2 EG8010 IR2110S Typical application circuit lockout pure sine wave inverter (unipolar modulation).
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