CN208805778U

CN208805778U - A kind of novel I C energy saving startup circuit

Info

Publication number: CN208805778U
Application number: CN201821725740.1U
Authority: CN
Inventors: 李飞
Original assignee: Shenzhen Angle Light Control Intelligent Lighting Technology Co Ltd
Current assignee: Shenzhen Angle Light Control Intelligent Lighting Technology Co Ltd
Priority date: 2018-10-24
Filing date: 2018-10-24
Publication date: 2019-04-30
Anticipated expiration: 2028-10-24

Abstract

The utility model relates to start-up circuit fields, espespecially a kind of novel I C energy saving startup circuit, it is charged using DC to the second capacitor C2, charging process DC exports starting current by triode Q1, power supply in this current start PWM chip or FPM chip, after power initiation, that is the second capacitor C2 charging complete, input current is direct current simultaneously, second capacitor C2 is equivalent to open circuit, due to there is no to provide the control electric current of triode Q1 base stage, so, the emitter of triode Q1 does not export starting current, therefore triode Q1 does not generate loss, realize the effect of a lossless starting, it has thoroughly done away with conventional start-up circuit power consumption and serious problem is lost, by using the capacitor of different capabilities, the starting time of phenomenon that temperature is excessively high and PWM chip or FPM chip is set to be under control, with this Meanwhile transfer efficiency has obtained better promotion；Zener diode ZD1 is used to prevent the excessively high formation interference signal of base voltage to starting voltage clamp.

Description

A kind of novel I C energy saving startup circuit

Technical field

The utility model relates to start-up circuit field, espespecially a kind of novel I C energy saving startup circuit.

Background technique

A starting current is required before PWM chip or the running of FPM chip, this start-up circuit is many kinds of at present:

The first start-up circuit as shown in Figure 1, AC before input rectifying bridge BR1 by first resistor R1 to PWM chip or The power supply of FPM chip；

Second of start-up circuit is as shown in Fig. 2, AC passes through first resistor R1 to PWM chip or FPM after rectifier bridge BR1 Chip power supply；

The third start-up circuit is as shown in figure 3, make electronic switch 1 of triode or metal-oxide-semiconductor, and 1 one, electron switch Electric current is controlled, the work of electronic switch 1 is allowed to give PWM chip or FPM chip one starting current, PWM chip or FPM after circuit work Chip powers from feedback and turns off the control electric current of electronic switch 1 by another electronic switch 2.

But there is lacuna in three of the above mode:

Referring to Fig.1, the embodiment of Fig. 2, due to the wide input voltage range of AC, at a low input voltages PWM chip or The starting time of FPM chip cannot ensure that the power consumption of first resistor R1 can be very big under high input voltage, while first resistor R1 Heat also will increase, transfer efficiency substantially reduces；By increasing multiple resistance, total losses can be divided equally, meet the function of resistance The requirement of rate derating degree, still, the quantity increase of resistance causes the area occupied on pcb board to increase, and simultaneously with this, increases PCB's Manufacture difficulty, cost, and the increase of resistance quantity will increase stand-by power consumption.

Referring to shown in Fig. 3, by increasing electronic switch 2, cause the circuit more complicated, and when circuit devcie quantity increases, The failure rate and cost of entire circuit can also be increase accordingly, and the first resistor R1 of electronic switch 1 also brings along loss, influences circuit The efficiency of conversion；When output carries out short-circuit test, since the power initiation speed on pcb board is fast, make power supply in the unit time The number inside restarted increases, and causes the temperature rise of power device excessively high.

Summary of the invention

To solve the above problems, the utility model provides a kind of novel I C energy saving startup circuit, may be implemented one it is lossless The effect of starting has thoroughly done away with conventional start-up circuit power consumption and serious problem, the excessively high phenomenon of temperature and PWM chip or FPM is lost The starting time of chip is under control, and simultaneously with this, transfer efficiency has obtained better promotion.

A kind of in order to achieve the above purposes, the technical solution adopted by the utility model is: novel I C energy saving startup circuit includes There are triode Q1, rectifier bridge BR1, the second capacitor C2, the input terminal of rectifier bridge BR1 connects alternating current, the ground terminal of rectifier bridge BR1 It is connect with GND interface, the output end of rectifier bridge BR1 is connect by the second capacitor C2 with the base stage of triode Q1, rectifier bridge BR1's Output end is also connect with the collector of triode Q1, the emitter of triode Q1 respectively with the anode of zener diode ZD1, power supply Connection, the cathode of zener diode ZD1 are connect with the base stage of triode Q1.

It further, further include having first capacitor C1, the output end of rectifier bridge BR1 also connects with one end of first capacitor C1 It connects, the output end ground connection of first capacitor C1.

Further, further include having first resistor R1, the both ends of the first resistor R1 respectively with the second capacitor C2, three poles The base stage of pipe Q1 connects.

Further, further include having third capacitor C3, the emitter of triode Q1 by third capacitor C3 respectively with pressure stabilizing The anode of diode ZD1, connect.

It further, further include having second resistance R2, the output end of rectifier bridge BR1 also connects with one end of second resistance R2 It connects, the other end of second resistance R2 is connect with the collector of triode Q1.

The utility model has the beneficial effects that:

It is charged using DC to the second capacitor C2, charging process DC exports starting current by triode Q1, this electric current opens Power supply in dynamic PWM chip or FPM chip, after power initiation, i.e. the second capacitor C2 charging complete, while input current is direct current Electricity, the second capacitor C2 are equivalent to open circuit, due to there is no to provide the control electric current of triode Q1 base stage, then, the hair of triode Q1 Emitter-base bandgap grading does not export starting current, therefore triode Q1 does not generate loss, realizes the effect of a lossless starting, has thoroughly done away with biography Serious problem is lost in system start-up circuit power consumption, by using the capacitor of different capabilities, makes the phenomenon and PWM chip that temperature is excessively high Or the starting time of FPM chip is under control, simultaneously with this, transfer efficiency has obtained better promotion；Zener diode ZD1 For preventing the excessively high formation interference signal of base voltage to starting voltage clamp.

Detailed description of the invention

Fig. 1 is the circuit diagram of the first start-up circuit.

Fig. 2 is the circuit diagram of second of start-up circuit.

Fig. 3 is the circuit diagram of the third start-up circuit.

Fig. 4 is the circuit diagram of the utility model.

Specific embodiment

The utility model is about in order to make technical problem to be solved in the utility model, technical solution and beneficial effect more Add clear, clear, below in conjunction with drawings and examples, the present invention will be further described in detail, in the utility model Triode can be replaced with metal-oxide-semiconductor, this is only a kind of embodiment, it should be understood that specific embodiment described herein is only To explain the utility model, it is not used to limit the utility model.

It please refers to shown in Fig. 4, the utility model includes triode Q1, whole about a kind of novel I C energy saving startup circuit Bridge BR1, the second capacitor C2 are flowed, the input terminal of rectifier bridge BR1 connects alternating current, and the ground terminal and GND interface of rectifier bridge BR1 connects Connect, the output end of rectifier bridge BR1 is connect by the second capacitor C2 with the base stage of triode Q1, the output end of rectifier bridge BR1 also with The collector of triode Q1 connects, and the emitter of triode Q1 is connect with the anode of zener diode ZD1, power supply respectively, pressure stabilizing The cathode of diode ZD1 is connect with the base stage of triode Q1.

The use principle of the utility model is as follows:

In this embodiment, AC of the input voltage value between 85 ~ 305V measures input work in input voltage value Rate is 47W, electric power output voltage 12V, electric power outputting current 3.5A, in order to guarantee starting time when 85V input, first Resistance R1 is 100K Ω.

The gross efficiency of power supply are as follows:

The maximum loss of start-up resistor is as follows in Fig. 2 technical solution:

Resistance accounts for input loss ratio are as follows:

The loss of start-up resistor is 0W in this specific embodiment technical solution, so this specific implementation The transfer efficiency of power supply in example are as follows:

The efficiency of promotion are as follows: Pt=(Pin2-Pin) × 100%

Pt=(93-89.4)×100%

Pt=3.6%

Capacitor charging time are as follows:

It is equal to open circuit relative to bus DC voltage after the second capacitor C2 is fully charged, so control triode Q1's is defeated Starting current is zero out.After power supply works normally, there will be no power losses for start-up circuit.It can be learnt from above-mentioned calculating Power supply can promote 3.6% overall efficiency in the technical solution of 305Vac input phase comparison diagram 2；Referring to above-mentioned capacitor charging Time formula, as long as one suitable charging current of selection, then can be controlled, because capacitor has always the starting time One charging time, so when the time of power supply restarting is exactly the time charged to the second capacitor C2.

It further, further include having first capacitor C1, the output end of rectifier bridge BR1 also connects with one end of first capacitor C1 It connects, the output end ground connection of first capacitor C1；Using the above scheme, the effect of first capacitor C1 is filtering, is used for smooth electric current.

Further, further include having first resistor R1, the both ends of the first resistor R1 respectively with the second capacitor C2, three poles The base stage of pipe Q1 connects；Using the above scheme, first resistor R1 is current-limiting resistance, prevents electric current is excessive from burning out power supply.

Further, further include having third capacitor C3, the emitter of triode Q1 by third capacitor C3 respectively with pressure stabilizing The anode of diode ZD1, connect；Using the above scheme, third capacitor C3 is for reducing impedance.

It further, further include having second resistance R2, the output end of rectifier bridge BR1 also connects with one end of second resistance R2 It connects, the other end of second resistance R2 is connect with the collector of triode Q1；Using the above scheme；Second resistance R2 is limited galvanic electricity Resistance, prevents electric current is excessive from burning out power supply.

Embodiment of above is only that preferred embodiments of the present invention are described, not to the utility model Range be defined, under the premise of not departing from the spirit of the design of the utility model, this field ordinary engineering and technical personnel to this The various changes and improvements that the technical solution of utility model is made should all fall into the guarantor that claims of the utility model determine It protects in range.

Claims

1. a kind of novel I C energy saving startup circuit, it is characterised in that: include triode (Q1), rectifier bridge (BR1), the second capacitor (C2), the input terminal of zener diode (ZD1), rectifier bridge (BR1) connect alternating current, and the ground terminal of rectifier bridge (BR1) connects with GND The output end of mouth connection, rectifier bridge (BR1) is connect by the second capacitor (C2) with the base stage of triode (Q1), rectifier bridge (BR1) Output end also connect with the collector of triode (Q1), the emitter of triode (Q1) respectively with zener diode (ZD1) Anode, power supply connection, the cathode of zener diode (ZD1) are connect with the base stage of triode (Q1).

2. a kind of novel I C energy saving startup circuit according to claim 1, it is characterised in that: further include having first capacitor (C1), the output end of rectifier bridge (BR1) is also connect with one end of first capacitor (C1), the output end ground connection of first capacitor (C1).

3. a kind of novel I C energy saving startup circuit according to claim 1, it is characterised in that: further include having first resistor (R1), the both ends of the first resistor (R1) are connect with the base stage of the second capacitor (C2), triode (Q1) respectively.

4. a kind of novel I C energy saving startup circuit according to claim 1, it is characterised in that: further include having third capacitor (C3), the emitter of triode (Q1) by third capacitor (C3) respectively with the anode of zener diode (ZD1), connect.

5. a kind of novel I C energy saving startup circuit according to claim 1, it is characterised in that: further include having second resistance (R2), the output end of rectifier bridge (BR1) is also connect with one end of second resistance (R2), the other end of second resistance (R2) and three poles Manage the collector connection of (Q1).