CN201774468U

CN201774468U - Voltage dropping circuit with capacitor for filtering waves by using inducer

Info

Publication number: CN201774468U
Application number: CN2010201208837U
Authority: CN
Inventors: 汤乃申; 汤征宁
Original assignee: 汤征宁
Priority date: 2010-03-01
Filing date: 2010-03-01
Publication date: 2011-03-23
Anticipated expiration: 2020-03-01

Abstract

The utility model relates to a voltage dropping circuit with a capacitor for filtering waves by using an inducer, wherein the voltage is firstly dropped by using a capacitor C1; the dropped voltage is rectified by a rectification circuit; the rectified voltage is filtered into direct current by a wave-filtering capacitor C2; and the direct current is firstly connected in series with a surge absorption circuit by a wave-filtering inducer L to absorb surge current and then connected to load. Therefore, in the utility model, the ordinary current-limiting resistor is replaced by the wave-filtering inducer L, as the inducer plays a role in suppressing the surge current, not only is the power consumption of the current-limiting resistor greatly reduced, but also the impact of the surge current on the surge circuit and the load can be reduced, and the efficiency and the stability of the circuit are improved.

Description

A kind of capacity voltage dropping circuit with inductor filter

Technical field

The utility model relates to a kind of capacity voltage dropping circuit with inductor filter.

Background technology

Known capacity voltage dropping circuit, for preventing that surge current from damaging load, when input, just seal in a resistance with limit inrush currents, so not only power consumption is very big, and because surge voltage is very big, though resistance is bigger, but surge current is still very big, earlier through the resistance current limliting, add surge absorbing circuit again after the rectification that also has, the power consumption on the current-limiting resistance is still bigger like this.

The utility model content

In order to solve existing capacity voltage dropping circuit limit inrush currents deficiency, the shortcoming that the power consumption on the current-limiting resistance is bigger, provide a kind of loss little, to the safer capacity voltage dropping circuit of load, the utility model proposes following technical scheme:

1, a kind of capacity voltage dropping circuit with inductor filter comprises; Decompression capacitor C1,1, rectification circuit 2, filter capacitor C2,3, filter inductance L, 4, surge absorbing circuit 5, load 6; AC power one end is behind decompression capacitor C1,1, connect input one end of rectification circuit 2, the input other end of another termination rectification circuit 2 of AC power, rectification circuit 2 output two ends also meet filter capacitor C2,3, filter capacitor C2,3 a termination filter inductance L, 4 one ends, filter inductance L, 4 other ends connect an input of surge absorbing circuit 5 again, another input of filter capacitor C2, another termination surge absorbing circuit 5 of 3, two outputs of surge absorbing circuit 5 connect two ends of load 6.

2, described rectification circuit 2 can be made up of full-wave bridge rectifier circuit or half-wave voltage doubler.Full-wave bridge rectifier circuit is by rectifier diode D1, D2, and D3, D4 is connected into bridge circuit and forms.

3, described surge absorbing circuit 5 is made up of semiconductor device BG with amplification characteristic and sampling resistor R1, the utmost point of semiconductor device BG with amplification characteristic is as an input of surge absorbing circuit 5, connect the other end of filter inductance L, be connected to load 6 again, make an output of surge absorbing circuit 5, another utmost point of semiconductor device BG with amplification characteristic is as another input of surge absorbing circuit 5, connect the other end of filter capacitor 3, after being connected in series sampling resistor R1 again, connect the other end of load 6, make another output of surge absorbing circuit 5, another output of surge absorbing circuit 5 is received the control end of the semiconductor device BG with amplification characteristic simultaneously.

4, described surge absorbing circuit 5 is made up of semiconductor device D with stabilized voltage characteristic and current-limiting resistance R2, two ends of semiconductor device D with stabilized voltage characteristic are as two inputs of surge absorbing circuit 5, one terminates on the other end of filter inductance L, be connected in series current-limiting resistance R2 again and be connected to the output that surge absorbing circuit 5 is made in load, another input of surge absorbing circuit 5 is connected on the other end of filter capacitor 3, is connected to another output that surge absorbing circuit 5 is made in load 6 again.

5, described load 6 is LED lamps, can be by single led pipe or the series connection of a plurality of LED pipe, and parallel connection or series-parallel connection are formed.

The beneficial effects of the utility model

Circuit design has adopted inductor filter, has eliminated resistance loss, has suppressed surge current effectively, and is not only energy-conservation but also guaranteed payload security.

Description of drawings

Fig. 1 is a functional-block diagram of the present utility model.

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

Fig. 3 is two of an electrical schematic diagram of the present utility model.

Label declaration among the figure:

1, decompression capacitor C1,2, rectification circuit, 3, filter capacitor C2,4, filter inductance L, 5, surge absorbing circuit, 6, load, BG has the semiconductor device of amplification characteristic, and D has the stabilized voltage characteristic semiconductor device, D1, D2, D3, D4 rectifier diode, R1 sampling resistor, R2 current-limiting resistance.

Embodiment

Following embodiment explains in conjunction with the accompanying drawings.

At first in conjunction with Fig. 1, overall technological scheme of the present utility model is described below.

A kind of capacity voltage dropping circuit of the utility model with inductor filter, described AC power comprises first end and second end; Comprise: decompression capacitor C1, rectification circuit 2, filter capacitor C2, filter inductance L, surge absorbing circuit 5, load 6; AC power one end is behind decompression capacitor C1, connect input one end of rectification circuit 2, the input other end of another termination rectification circuit 2 of AC power, rectification circuit 2 output two ends also meet filter capacitor C2, the termination filter inductance L of filter capacitor C2, filter inductance L connects an input of surge absorbing circuit 5, another input of another termination surge absorbing circuit 5 of filter capacitor C2 again, two outputs of surge absorbing circuit 5 connect two ends of load 6.

The utility model is that the AC power of outside is first through decompression capacitor C1, send into the rectification circuit rectification after the step-down, again by filter capacitor C2 and filter inductance L filtering, filter inductance L also has the effect that suppresses surge concurrently, deliver to surge absorbing circuit through filtered direct current, the surge that produces when mains switch or voltage jump is absorbed at ordinary times, by the electric current arrival load of surge absorbing circuit, guaranteed the safety of load, can not be subjected to rush of current and damage.

Fig. 2 is an embodiment of the present utility model.Electric main two ends of input, wherein an end is through decompression capacitor C1 step-down, input to together by D1 with the other end then, D2, D3, D4 forms bridge rectifier 2, the output of bridge rectifier also meets filter capacitor C2, the end of filter capacitor C2, meet filter inductance L, the other end of filter inductance L connects the utmost point of Darlington circuit BG among semiconductor device with amplification characteristic such as Fig. 2, input one end as surge absorbing circuit 5, this end as an end of surge absorbing circuit 5 outputs, connects load 6 again again, one end of LED lamp, Darlington circuit BG is made up of a PNP pipe and the complementation of a NPN pipe among Fig. 2, another utmost point of Darlington circuit BG connects the other end of filter capacitor C2, this end meets sampling resistor R1 again, and the other end of R1 is as the other end of surge absorbing circuit 5 outputs, connect load 6, the other end of LED lamp, this end also connect the control utmost point of Darlington circuit BG.The voltage that surge current produces by R1 enters the control utmost point of BG, drives BG and absorbs surge current.BG among Fig. 2 is a Darlington circuit, also can be any semiconductor device with amplification characteristic.

Fig. 3 is another embodiment of the present utility model.The surge absorbing circuit 5 of this circuit; be made up of semiconductor device D with stabilized voltage characteristic and current-limiting resistance R2, two ends of D are as two inputs of surge absorbing circuit 5, and one terminates on the filter inductance L; be connected in series current-limiting resistance R2 again and be connected to load; make an output of surge absorbing circuit 5, the other end is connected on the other end of C2, is connected to load 6, LED lamp again; make another output of surge absorbing circuit 5; surge current by L suppresses is absorbed by D again, better protection load.

The LED lamp can be made up of the series, parallel or the series-parallel connection of single pipe or a plurality of pipes.

In sum, the utility model replaces common current-limiting resistance with filter inductance, has not only reduced the power consumption of current-limiting resistance greatly but also can reduce the impact of surge current to surge circuit and load, has improved the efficient and the stability of circuit.

Claims

1. capacity voltage dropping circuit with inductor filter, it is characterized in that comprising decompression capacitor C1 (1), rectification circuit (2), filter capacitor C2 (3), filter inductance L (4), surge absorbing circuit (5), load (6), AC power one end is behind decompression capacitor C1 (1), connect input one end of rectification circuit (2), the input other end of another termination rectification circuit (2) of AC power, rectification circuit (2) output two ends also meet filter capacitor C2 (3), a termination filter inductance L (4) one ends of filter capacitor C2 (3), the other end of filter inductance L (4) connects an input of surge absorbing circuit (5) again, another input of another termination surge absorbing circuit (5) of filter capacitor C2 (3), two outputs of surge absorbing circuit (5) connect two ends of load (6).

2. a kind of capacity voltage dropping circuit with inductor filter according to claim 1 is characterized in that described rectification circuit (2), can be made up of full-wave bridge rectifier circuit or half-wave voltage doubler.

3. a kind of capacity voltage dropping circuit according to claim 1 with inductor filter, it is characterized in that described surge absorbing circuit (5) is made up of semiconductor device with amplification characteristic (BG) and sampling resistor (R1), the utmost point of semiconductor device (BG) with amplification characteristic is as an input of surge absorbing circuit (5), connect the other end of filter inductance L (4), be connected to load (6) again, make an output of surge absorbing circuit (5), another utmost point of semiconductor device (BG) with amplification characteristic is as another input of surge absorbing circuit (5), connect the other end of filter capacitor C2 (3), after being connected in series sampling resistor (R1) again, connect the other end of load (6), make another output of surge absorbing circuit (5), another output of surge absorbing circuit (5) is received the control end of the semiconductor device (BG) with amplification characteristic simultaneously.

4. a kind of capacity voltage dropping circuit according to claim 1 with inductor filter, it is characterized in that described surge absorbing circuit (5) is made up of semiconductor device with stabilized voltage characteristic (D) and current-limiting resistance (R2), two ends of semiconductor device (D) with stabilized voltage characteristic are as two inputs of surge absorbing circuit (5), one terminates on filter inductance L (4) other end, be connected in series current-limiting resistance (R2) again and be connected to load, make an output of surge absorbing circuit (5), another input of surge absorbing circuit (5) is connected on the other end of filter capacitor C2 (3), is connected to another output that surge absorbing circuit (5) is made in load (6) again.

5. a kind of capacity voltage dropping circuit with inductor filter according to claim 1 is characterized in that described load (6) is the LED lamp, can be by single led pipe or the series connection of a plurality of LED pipe, and parallel connection or series-parallel connection are formed.