CN201985754U

CN201985754U - Start circuit device of switch power

Info

Publication number: CN201985754U
Application number: CN2010206927085U
Authority: CN
Inventors: 黄敏
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-12-31
Filing date: 2010-12-31
Publication date: 2011-09-21
Anticipated expiration: 2020-12-31

Abstract

The utility model relates to a start circuit device of a switch power. The start circuit device is capable of reducing the electrical loss of an LED (light-emitting diode) switch power and is composed of a triode Q1, a triode Q2, a start resistor R1, a power supply resistor R2, and a resistor R3. The two ends of the start resistor R1 respectively relate to an end A and an end B; the two ends of the power supply resistor R2 respectively relate to an end C and an end D; the two ends of the resistor R3resistor R2 respectively relate to an end E and an end F; the end A of the start resistor R1 is connected with the end C of the power supply resistor R2; the end B of the start resistor R1 is connected with a collector 1 of the triode Q1; the end A of the start resistor R1 is connected with the end C of the power supply resistor R2; the end D of the power supply resistor R2 is connected with a base 1 of the triode Q1 and a collector 2 of the triode Q2; an emitter of the triode Q2 is earthed; and a base 2 of the triode Q2 is connected with the end E of the resistor R3. The start circuit device of the switch power has the advantage of reducing the electrical loss of the switch power.

Description

Switching Power Supply start-up circuit device

Technical field

A kind of Switching Power Supply start-up circuit device that can reduce the Switching Power Supply electrical loss.

Background technology

Along with the progressively popularization of LED light fixture, the lifting of the driving power efficient of LED light fixture becomes the new problem of light fixture and power supply manufacturer.It is 80% just good that the regular tap power-efficient can reach.But the driving power efficient of 5-20 watt of the efficiency grade regulation of LED driving power reaches 88% and just can be regarded as one-level efficiency standard in the national new standard.Launched the improved efficiency contest of LED power supply thus.

The startup of the control IC in the primary return of present various Switching Power Supplies power supply all be by after the AC rectification by resistance to electric capacity directly charging start the work of power supply, this loop but still in work, has wasted the part electric energy after working together.This part electric energy absolute value (about 0.2W) is few, if but for the LED light fixture that originally has only 10W, be exactly 2% efficiency variance.It is very considerable taking care of the pence, and resembles the stand-by power consumption of television set, and originally GB is less than 3W, and now the level of industry is towards the effort of standby zero-power.

Summary of the invention

The purpose of this utility model is to provide a kind of Switching Power Supply start-up circuit device that can reduce LED Switching Power Supply electrical loss.

The purpose of this utility model is achieved in that it is made of triode Q1, triode Q2, starting resistance R1, supplying resistance R2 and resistance R 3; The two ends of starting resistance R1 are respectively A, B end, and the two ends of supplying resistance R2 are respectively C, D end, and the two ends of resistance R 3 are respectively E, F end, and the A end of described starting resistance R1 links to each other with the C end of R2, and the B end of starting resistance R1 links to each other with the collector electrode 1 of triode Q1; The A end of starting resistance R1 links to each other with the C end of supplying resistance R2, and the D end of supplying resistance R2 links to each other with the base stage 1 of triode Q1 and the collector electrode 2 of triode Q2; Emitter 2 ground connection of triode Q2, the E end of the base stage 2 connecting resistance R3 of triode Q2.

Advantage of the present utility model is for reducing the loss of Switching Power Supply, the startup power supply of the control IC in the Switching Power Supply primary return is by starting the work of power supply by resistance to direct charging of electric capacity after the AC rectification, this loop disconnects after working together, after the disconnection, can save the electric weight of about 0.2W, for the LED light fixture that originally has only 10W, be exactly 2% efficiency variance.

Description of drawings

Fig. 1 is a circuit diagram of the present utility model.

Embodiment

As shown in Figure 1: structure of the present utility model is such: it is made of triode Q1, triode Q2, starting resistance R1, supplying resistance R2 and resistance R 3; The two ends of starting resistance R1 are respectively A, B end, the two ends of supplying resistance R2 are respectively C, D end, the two ends of resistance R 3 are respectively E, F end, and the A end of described starting resistance R1 links to each other with the C end of R2, the B end of starting resistance R1 and the collector electrode 1(U end of triode Q1) link to each other; The A of starting resistance R1 end links to each other with the C end of supplying resistance R2, and the D end of supplying resistance R2 is held with the base stage 1(W of triode Q1) and the collector electrode 2(X of triode Q2 hold) link to each other; The emitter 2(Y of triode Q2 end) the E end of connecting resistance R3 ground connection, the base stage 2(Z end of triode Q2).

It also comprises AC rectification, the elementary accessory power supply of Switching Power Supply, Switching Power Supply control IC, electrochemical capacitor; The output of AC rectification links to each other with the A point, the power end of Switching Power Supply control IC links to each other with the positive pole of electrochemical capacitor, the DC output end of the elementary accessory power supply output of Switching Power Supply links to each other with electrochemical capacitor is anodal, the emitter 1(V end of Q1) link to each other with electrochemical capacitor is anodal; Another output of the elementary accessory power supply output of Switching Power Supply links to each other the electrochemical capacitor minus earth with resistance R 3 F end.

Operation principle of the present utility model is as follows:

During energising just, Switching Power Supply is elementary also not to work together, and the elementary accessory power supply of Switching Power Supply does not have output voltage, and the F terminal voltage of resistance R 3 is 0, so triode Q2 ends; The A point voltage is that the alternating current after the rectification provides driving voltage for triode Q1 by supplying resistance R2, causes triode Q1 conducting, and the A point voltage charges to capacitor C through the triode Q1 of starting resistance R1 and conducting.When the voltage of electrochemical capacitor is enough high, the Switching Power Supply control IC is just started working, and the elementary of Switching Power Supply just can get up by snap action, and the elementary accessory power supply of Switching Power Supply in time charges to electrochemical capacitor, make to obtain to stablize sufficiently high voltage on the electrochemical capacitor, guarantee the Switching Power Supply continuous firing.At this moment the output voltage of the elementary accessory power supply of Switching Power Supply causes the F terminal voltage of resistance R 3 to rise, and causes triode Q2 conducting.It is 0 that triode Q2 conducting causes triode Q1 base stage 1 voltage, and Q1 just enters cut-off state like this.

Finish to this this device action.

Device produces the principle of energy-saving effect: normal for guaranteeing power initiation, the starting resistance R1 of operated by rotary motion is about 150K, now set resistance R 1 and be 150K, if not increasing triode Q1 switch disconnects it, the A point voltage still charges to electrochemical capacitor by starting resistance R1 behind the power initiation, starting resistance R1 produces loss, loss power approximately: 220V*220V/150K=0.32W is exactly 1.6% loss in efficiency for the Switching Power Supply of 20W gross power.Owing to increased triode Q1 and associated drives control circuit, Switching Power Supply starts back triode Q1 and is in cut-off state in this device, and starting resistance R1 goes up no current and flows through, and does not have any loss.Only stay the loss of supplying resistance R2, because the transistorized current amplification factor of Q1 is generally more than 100 times, so the R2 resistance value can be chosen more than 100 times of R1 resistance.So the loss of R2 only is 1% of 0.32W, promptly 0.0032W only accounts for 0.016% to the 20W power supply, can ignore substantially, and the last actual efficient that improves is exactly 1.6%.For the huge illuminating product of consumption, it is appreciable on average saving 1.6% power.LED light fixture for 10W is exactly 3.2% improved efficiency, and social benefit and economic benefit are objective.

Wherein the elementary accessory power supply of Switching Power Supply, rectification circuit, Switching Power Supply control IC are existing common technical pattern, the elementary accessory power supply of sources generally can be one group of power supply, also can be two independently accessory power supply connect the F end of electrochemical capacitor and resistance R 3 respectively; Rectification circuit can be the halfwave rectifier of single rectifier diode, also can be bridge rectifier, in actual the use, also A, C point can be directly connected to exchange and hold and need not through over commutation, guarantees that power supply can normally start but will adjust the R1 value; The Switching Power Supply control IC can be a control IC independently, also can be the module device that integrates with power transistor, and above-mentioned change does not all influence the effect after the utility model adds.

Claims

1. Switching Power Supply start-up circuit device, it is characterized in that: it is made of triode Q1, triode Q2, starting resistance R1, supplying resistance R2 and resistance R 3; The two ends of starting resistance R1 are respectively A, B end, and the two ends of supplying resistance R2 are respectively C, D end, and the two ends of resistance R 3 are respectively E, F end, and the A end of described starting resistance R1 links to each other with the C end of R2, and the B end of starting resistance R1 links to each other with the collector electrode 1U end of triode Q1; The A end of starting resistance R1 links to each other with the C end of supplying resistance R2, and the D end of supplying resistance R2 links to each other with the collector electrode 2X end of the base stage 1W end of triode Q1 and triode Q2; The emitter 2Y end ground connection of triode Q2, the E end of the base stage 2Z terminating resistor R3 of triode Q2.

2. Switching Power Supply start-up circuit device according to claim 1 is characterized in that: it also comprises AC rectification, the elementary accessory power supply of Switching Power Supply, Switching Power Supply control IC, electrochemical capacitor; The output of AC rectification links to each other with the A point, the power end of Switching Power Supply control IC links to each other with the positive pole of electrochemical capacitor, the DC output end of the elementary accessory power supply output of Switching Power Supply links to each other with electrochemical capacitor is anodal, and the emitter 1V end of Q1 links to each other with electrochemical capacitor is anodal; Another output of the elementary accessory power supply output of Switching Power Supply links to each other the electrochemical capacitor minus earth with resistance R 3 F end.