CN201393175Y - Voltage reduction rectifying voltage stabilizer - Google Patents

Abstract

The utility model relates to a voltage reduction rectifying voltage stabilizer which is characterized by comprising a voltage reduction capacitor, rectifier diodes D0 and D1, voltage stabilization diodes D2 and D3, and a filter capacitor C2; an AC power supply is reduced the voltage by the voltage reduction capacitor C1, rectified by the rectifier diode D0 and filtered by the filter capacitor C2 at the positive semi-cycle, and then a closed circuit is formed by a load RL and the voltage stabilization diode D3; and the AC power supply is reduced the voltage by the voltage reduction capacitor C1, rectified by the rectifier diode D1 and filtered by the filter capacitor C2 at the negative semi-cycle, and then a closed circuit is formed by the load RL and the voltage stabilization diode D2. By adopting the structure, the capacitors are adopted for reducing the voltage and can distribute the voltage in a dynamic way when the load voltage is far lower than the supply voltage; in each positive cycle and the negative cycle, the voltage stabilization diodes D2 and D3 alternately play the role of stabilizing the voltage. If the input voltage is higher, the D2 and the D3 can alternately share the power consumption, so that the whole circuit is stable and safe as well as has lower requirement for the performance of components. Compared with the prior art, a transformer and a voltage stabilizer are omitted, so that the cost is reduced, and the structure is simplified; and as the capacitors are used for reducing the voltage, and the voltage stabilization diodes are used for stabilizing the voltage, the electricity consumption can be reduced.

Description

A kind of step-down rectifier pressurizer

Technical field

The utility model relates to a kind of step-down, rectification and direct current regulation circuit.

Background technology

Present prior art, known step-down, rectification and voltage stabilizing circuit as shown in Figure 1, are made up of transformer step-down, bridge rectifier, capacitor filtering and three terminal regulator voltage stabilizing circuit.When the input AC electricity, through step-down, rectification, filtering and voltage stabilizing output DC.But in this circuit working process, the power consumption of transformer and pressurizer is very big, and when this kind circuit application during in little electric current, small-power electronics product, it is very low that the utilance of electric energy will become; This circuit element quantity is many in addition, spoilage is high and small product size big, increased product cost.

Summary of the invention

The purpose of this utility model is: a kind of step-down rectifier pressurizer is provided, and it has overcome the shortcoming of prior art, has the advantages that power consumption is little, utilization rate of electrical is high.

The utility model is achieved in that a kind of step-down rectifier pressurizer, and its special character is: comprise decompression capacitor, rectifier diode D0, D1, voltage stabilizing didoe D2, D3, filter capacitor C2;

AC power through decompression capacitor C1 step-down, rectifier diode D0 rectification, filter capacitor C2 filtering, constitutes closed-loop path through load RL, voltage stabilizing didoe D3 at positive half cycle;

AC power through decompression capacitor C1 step-down, rectifier diode D1 rectification, filter capacitor C2 filtering, constitutes closed-loop path through load RL, voltage stabilizing didoe D2 at negative half period.

A kind of step-down rectifier pressurizer of the utility model owing to adopt such structure, adopts capacitance decompression (electric capacity is consumed power not), at load voltage under the situation of supply voltage, but electric capacity dynamic assignment voltage; Be connected with the mode of two voltage stabilizing didoes with two rectifier diodes according to circuit.When input voltage is positive half cycle, diode D0 and D3 forward conduction, reverse breakdown when voltage stabilizing didoe D2 rises to greater than its voltage stabilizing value at voltage, diode D1 ends with bearing reverse voltage.When input voltage was negative half period, D1 and D2 bore forward voltage and conducting, and D3 bears reverse voltage, reverse breakdown when magnitude of voltage is higher than its voltage stabilizing value, and D0 bears reverse voltage and ends.At each positive negative cycle, voltage stabilizing didoe D2 and D3 alternately play a part burning voltage.When if input voltage is big, because alternately sharing power consumption, D2 and D3 make very stability and safety of entire circuit, lower to the element function requirement.Compared with prior art, saved transformer, pressurizer, reduced cost, simplified the structure; Adopt capacitance decompression, voltage stabilizing didoe voltage stabilizing, reduced power consumption.

Description of drawings

Fig. 1 is the electrical schematic diagram of prior art.

Fig. 2 is an electrical schematic diagram of the present utility model.

Electrical schematic diagram when Fig. 3 is the positive half cycle of the utility model.

Electrical schematic diagram when Fig. 4 is the utility model negative half period.

Embodiment

Below in conjunction with accompanying drawing the utility model is further described.

As shown in Figure 2, a kind of step-down rectifier pressurizer comprises decompression capacitor C1, rectifier diode D0, D1, voltage stabilizing didoe D2, D3, filter capacitor C2;

Rectifier diode D0, D1 series circuit, voltage stabilizing didoe D2, D3 series circuit, filter capacitor C2 and load parallel connection, the power supply phase line is connected between rectifier diode D0, the D1 through decompression capacitor C1, and zero line is connected between voltage stabilizing didoe D2, the D3.

As shown in Figure 3, AC power through decompression capacitor C1 step-down, rectifier diode D0 rectification, filter capacitor C2 filtering, constitutes closed-loop path through load RL, voltage stabilizing didoe D3 at positive half cycle;

As shown in Figure 4, AC power through decompression capacitor C1 step-down, rectifier diode D1 rectification, filter capacitor C2 filtering, constitutes closed-loop path through load RL, voltage stabilizing didoe D2 at negative half period.

When input voltage is the positive half cycle of waveform, as shown in Figure 3.When magnitude of voltage rose to voltage stabilizing value greater than voltage stabilizing didoe D2, it is stable that the D2 reverse-conducting is kept load terminal voltage.Suppose that now power input voltage is 220V, voltage effective value is 24V after capacitor C 1 step-down, and load end requirement voltage is 12V.Ignore diode forward conducting power consumption, and capacitor C 2 strobes, by the electric current of capacitor C 1 as can be known, the voltage stabilizing didoe D2 reverse-conducting time is

T, wherein T is a voltage cycle.So the power consumption of D2 is in the half period $\mathrm{Qd}=\frac{1}{2}T\×U1\×(I-\mathrm{Ir}),$ By the power supply total work $Q=\frac{1}{2}T\×U1\×I$ Know that the power consumption of voltage stabilizing didoe is less than input work And prior art when transformer-secondary voltage is 24V, knows that by series relationship this circuit power consumption is an input work

This shows that efficient of the present utility model is higher than the step-down rectifier voltage stabilizing circuit of prior art.

Claims (1)

1, a kind of step-down rectifier pressurizer is characterized in that: comprise decompression capacitor C1, rectifier diode D0, D1, voltage stabilizing didoe D2, D3, filter capacitor C2;

Rectifier diode D0, D1 series circuit, voltage stabilizing didoe D2, D3 series circuit, filter capacitor C2 and load parallel connection, the power supply phase line is connected between rectifier diode D0, the D1 through decompression capacitor C1, and zero line is connected between voltage stabilizing didoe D2, the D3;

AC power through decompression capacitor C1 step-down, rectifier diode D0 rectification, filter capacitor C2 filtering, constitutes closed-loop path through load RL, voltage stabilizing didoe D3 at positive half cycle;

AC power through decompression capacitor C1 step-down, rectifier diode D1 rectification, filter capacitor C2 filtering, constitutes closed-loop path through load RL, voltage stabilizing didoe D2 at negative half period.

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