Effective switching regulator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Effective switching regulator. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Surge Protectors

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A switching regulator circuit based on a simple element base is proposed.

(click to enlarge)

When first turned on, when the capacitor C4 is discharged and a sufficiently powerful load is connected to the output, the current flows through the linear regulator IC DA1. The voltage drop across R1 caused by this current unlocks the key transistor VT1, which immediately enters saturation mode, since the inductive resistance L1 is large and a sufficiently large current flows through the transistor. The voltage drop across R5 opens the main key element - transistor VT2. Current. increasing in L1, charges C4, while the stabilizer and the key transistor are locked through the feedback on R8. The energy stored in the coil powers the load. When the voltage at C4 drops below the stabilization voltage, DA1 and the key transistor open. The cycle is repeated at a frequency of 20-30 kHz.

Circuit R3, R4, C2 will set the output voltage level. It can be smoothly adjusted within a small range, from Uct DA1 to Uin. However, if Uout is raised close to Uin, there is some instability at maximum load and an increased level of ripple. To suppress high-frequency ripples, a filter L2, C5 is included at the output of the stabilizer.

The scheme is quite simple and most effective for this level of complexity. All power elements VT1, VT2, VD1, DA1 are supplied with small radiators. The input voltage must not exceed 30 V, which is the maximum for KR142EN8 stabilizers. Rectifier diodes should be used for a current of at least 3 A.

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