Novel Sepic AC-AC chopping voltage regulation circuit and application thereof

[0007] attached figure 1 It shows the existing Sepic AC up-down chopper voltage regulator circuit, which is composed of 2 capacitors C1 and C2, 2 inductors L1 and L2, 2 bidirectional switches S1 and S2 and their control circuits. Its characteristics are: 1) bidirectional switch S1 It consists of 2 diodes D1, D2 and 2 transistors V1, V2. 2) The bidirectional switch S2 is composed of 2 diodes D3, D4 and 2 triodes V3, V4. 3) Complementary control of S1 and S2, it is necessary to control two bidirectional switches at the same time to realize AC, AC, lift, chopping and voltage regulation.

[0008] attached figure 2 It is an innovative circuit of a Sepic AC lifting chopper voltage regulating circuit of the present invention, which is also composed of 2 capacitors C1 and C2, 2 inductors L1 and L2, 2 bidirectional switches S1 and S2 and their control circuits. In: on the one hand, with figure 2 The two-way switch S2 in the circuit is replaced by two thyristors V3 and V4 figure 1 Two diodes D3, D4 and two transistors V3, V4 in the two-way switch S2. And in the positive and negative half cycles of the power supply, DC voltages are respectively applied to the trigger poles of the thyristors V3 and V4. The reliability of the dry thyristor is much greater than that of the transistor, and the cost of the thyristor module is only one-third of the cost of the transistor module. Therefore, this innovation not only greatly improves the reliability of the Sepic AC lifting chopper voltage regulator circuit, but also greatly reduces The circuit is used for the manufacturing cost of the product, and it is named Gong's-Sepic AC boost chopper voltage regulator circuit to show the difference. On the other hand, the control method is also controlled by the attached figure 1 The S1 and S2 complementary controls are changed to the attached figure 2 The non-complementary control of the non-complementary control, as long as the on-off ratio of S1 can be adjusted to adjust the magnitude of the AC voltage at both ends of the AC output (3, 1).

[0009] attached image 3 It is a kind of compensation type AC stabilized voltage power supply of the present invention, it uses the innovative circuit of Sepic AC lifting chopper voltage regulating circuit to adjust the compensation voltage, and it uses 2 output terminals (A2, N) voltage feedback to control the on-off ratio of the bidirectional switch S1 to stabilize the output voltage.

[0010] In the innovative circuit of the Sepic AC lifting chopper voltage regulating circuit in the present invention, the bidirectional switches S1 and S2 are non-complementary control, as long as the on-off ratio of one bidirectional switch S1 is adjusted, the output lifting AC chopping voltage can be adjusted, because the two thyristors V2 And the cost of V3 is far lower than the cost of 4 triodes and 4 diodes, with strong overload capability and good reliability. Therefore, the innovative circuit of the Sepic alternating current step-up voltage regulation circuit of the present invention, each named as Gong's-Sepic alternating step-up voltage regulation circuit, is expected to be included in the textbook of power electronics technology, which records the Chinese people's understanding of the AC chopping voltage regulation circuit. scientific contributions.

[0011] The Gong's-Sepic AC step-up chopper voltage regulation circuit of the present invention can be widely used in occasions requiring direct step-up and step-down voltage regulation, compensating AC voltage stabilizers and other products.