source:Industry News Popular:adapter release time:2022-01-13 09:16:10 Article author:sznbone
The power adapter can be used as an efficient, fast, and safe battery charger to charge the battery in a notebook computer. The characteristic of the constant power single-chip notebook power adapter is: when the output voltage U. decreases, the constant power control circuit is used to force the output The current I｡ increases to make the product I｡×U｡ unchanged, and the output power P｡ remains constant. The constant power output characteristic curve is approximately a 15V､15W constant power 12V power adapter circuit composed of a hyperbolic TOP202Y as shown in the figure As shown in 9-34. When the output voltage drops from 15V (ie 100%×U) to 7.5V (ie 50%XU), the constant power accuracy can reach ±10%. The constant power control circuit is changed from vT､VT2 ､VDz3~VDZ5､R1~R7 composition. VT1 works in the saturation zone. VT1 and VT2 should choose 3DK4B switch tubes with good parameter consistency. R1 is the current detection resistor, and VT2 is used to monitor the voltage drop on R1. This circuit With temperature compensation characteristics, it can perform temperature compensation on the bias voltage and output voltage of VT1 and VT2. The constant power control circuit is composed of 5 parts:
①Constant current source circuit (VDZ4､R7､R3), which provides a constant collector current I for the bias circuit
② Bias circuit with temperature compensation (VT1､R2), its function is to provide bias voltage Um to VT2, and its transmitting junction voltage drop Um is equal to Um and has the same temperature coefficient;
③Current detection resistor (R1);
④ Voltage compensation circuit (VDZ1､R6､R4), which can compensate the transmitting junction voltage U of VT2;
⑤Voltage regulating circuit (IC2､VDZ2､R5), using an optocoupler feedback circuit with a voltage regulator tube to make U. Keep constant in the constant voltage zone.
15W constant power notebook charger circuit
When I｡ is small, VT2 is cut off, and VDZ2 is in the voltage stabilization zone, and the power adapter works in the constant voltage output mode, U15V, and the constant power control circuit does not work at this time. Set the base bias voltage of VT2 to Um, only when Ug2 When +UR1=UBc2, VT2 starts to conduct, and VDZ2 immediately ends, the circuit quickly switches from constant voltage control to constant power control, and follows the following positive feedback process U｡+→I｡↑→UR1↑→lF→ Ic↓→D↑→I｡↑, keep P. unchanged.
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