Voltage varying-regulating circuit, voltage varying-regulating set and intelligent electricity-saving device

Abstract

The embodiment of the invention relates to the field of power electronics, and provides a voltage varying-regulating circuit. The voltage varying-regulating circuit comprises a voltage varying-regulating idle circuit. The idle circuit comprises a switch K1, a switch K2, a switch K3, a switch K4 and a transformer T, wherein the switch K1 and the switch K2 are connected in parallel; one end of the switch K1 and one end of the switch K2 are connected with the anode of the primary side of the transformer; the switch K3 and the switch K4 are connected in parallel; one end of the switch K3 and one end of the switch K4 are connected with the cathode of the transformer; the other end of the switch K1 and the other end of the switch K4 are connected to one pole of an input end; the other end of the switch K2 and the other end of the switch K3 are connected to the other pole of the input end; and a load RL is connected in series between the output end VOUT of the secondary side of the transformer T and an N pole. The invention also provides a corresponding voltage varying-regulating set and an electricity-saving device. As the circuit reduces own consumption, a voltage regulating device can operate with long-term stabilization.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a voltage-changing and voltage-regulating circuit, a voltage-changing and voltage-regulating group and an intelligent power-saving device with a voltage stabilizing function. Background technique [0002] State-of-the-art power savers such as figure 1 As shown, including bypass contactor KM, 205V output control contactor KM1 (low power-saving gear); 195V output control contactor KM2 (high power-saving gear); tuned output autotransformer T (phase modulation line), Load RL. This prior art solution achieves the purpose of changing the output voltage by adjusting the number of secondary (output end) coils of the autotransformer. In terms of control principle, KM is interlocked with KM1 and KM2, and KM1 and KM2 are interlocked. The L terminal is connected to the mains phase line (live wire), the B point is connected to the load RL, and N is the neutral line. The working process is a...

AI Technical Summary

Problems solved by technology

[0007] (1) Since the total working current of the power saver is I=IR+IT, and the current of IT is small, the larger current IR passes through point B and passes through RL to form a closed loop, so when KM, KM1, and KM2 are switched, the touch The point flow current is large, it is easy to damage the contactor, which seriously affects the stability and service life of the power saver itself;

[0008] (2) Since the load RL must be disconnected from the power supply circuit before being connected in each switching, this will cause the load RL to be powered off, and the power-off time is the time for the two contactors to operate

In this case, if the load RL is a lighting load, it is easy to cause the light source to be turned off and then restarted, which is the phenomenon of "flash" in the power saving industry.

This phenomenon will cause greater damage to lighting fixtures;

[0009] (3) When the voltage is adjusted, due to the "flash" phenomenon of the load and the large switching current of the contactor, it is impossible to set multi-level automatic adjustment in actual use, which seriously reduces the intelligence and applicability of the power saver

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