WO2020062818A1

WO2020062818A1 - Circuit for improving power supply starting time, and driving power supply

Info

Publication number: WO2020062818A1
Application number: PCT/CN2019/080577
Authority: WO
Inventors: 罗根水; 王宗友
Original assignee: 深圳市崧盛电子股份有限公司
Priority date: 2018-09-28
Filing date: 2019-03-29
Publication date: 2020-04-02
Also published as: CN208986825U

Abstract

The present invention relates to a circuit for improving a power supply starting time, and a driving power supply. The circuit comprises: a control IC, a starting adjustment circuit, a switch circuit, a power supply circuit and a charging capacitor, wherein the high-voltage signal input end of the control IC is connected to an output end of a rectified bus voltage, a power supply end of the control IC is connected to the starting adjustment circuit, the starting adjustment circuit is connected to the switch circuit and the charging capacitor respectively, and the switch circuit and the charging capacitor are further connected to the power supply circuit respectively. According to the present invention, the starting time of the power supply can be effectively shortened when the power supply is started by means of providing the starting adjustment circuit, avoiding the phenomenon that an LED lamps on the load are lit without coordination due to the fact that the starting time of the power supply is different or too long.

Description

Circuit and driving power supply for improving power supply starting time

Technical field

The present invention relates to the technical field of driving power sources, and more particularly, to a circuit and a driving power source for improving the startup time of a power source.

Background technique

LEDs are gradually replacing traditional lighting sources, and they are becoming more and more widely used in various lighting fields. With the increasing development of social and economic construction, the level of basic lighting construction on urban roads has become an important indicator of the speed and level of urban development. The quality of lighting projects not only affects the safety of vehicles and pedestrians, but also relates to energy conservation and environmental protection goals Can it be achieved. At present, the energy consumption of road lighting in China is very serious. The main problems are excessive design of the lighting system, backward lighting control methods, incorrect lighting energy saving concepts, single lighting energy saving measures, and more importantly, the power supply and LED lights can be protected in time when an abnormality occurs. Problems, etc. Everyone knows that when it is used in outdoor lighting power supply, whether it is hot summer or cold winter, it must be powered on and turned on within the full input voltage range. The process of LED lighting cannot exceed 500mS. If the power-on start-up time is too long or the street lights on the entire road are powered on, the start-up time may be fast or slow, and it may seem uncoordinated at all. The idea of giving the city a beautiful landscape is contrary.

LED lighting drive power will inevitably become the focus of industry attention, whether it is outdoor lighting or indoor lighting has become the mainstream of the lighting industry, but a variety of drive power will appear in the market, which will add to the customer's choice of power Less trouble, even taking a lot of detours, and comparing some electrical performance of the drive power, assess whether it meets the requirements of some laws, regulations, EMC requirements, lightning surge requirements, IP waterproof level requirements, start-up time requirements, etc. , Especially in some different countries and regions, the voltage used is different, the start-up time is different. Some drive power sources may meet the requirements at 180-305Vac input, but the startup time does not meet the requirements at 90-150Vac input, especially under low temperature and low voltage conditions, and some may exceed 10 It takes 60 seconds to start, and some even fail to start, resulting in the LED lamp not lighting normally. Some lamps require several drive power sources to drive several LED lights, but if the startup time is not the same, some lights will first light up, and some one or more lights will light up later, causing serious inconsistency.

technical problem

The technical problem to be solved by the present invention is to provide a circuit and a driving power supply for improving the start-up time of a power supply in response to the foregoing defects of the prior art.

Technical solutions

The technical solution adopted by the present invention to solve its technical problems is to construct a circuit for improving the startup time of the power supply, including: a control IC, a startup adjustment circuit, a switch circuit, a power supply circuit, and a charging capacitor;

The high-voltage signal input terminal of the control IC is connected to the output terminal of the rectified bus voltage, the power supply terminal of the control IC is connected to the startup adjustment circuit, and the startup adjustment circuit is connected to the switch circuit and the charging capacitor, respectively. A switching circuit and the charging capacitor are also connected to the power supply circuit, respectively.

Preferably, the startup adjustment circuit includes a suppression circuit and a bleeder circuit;

A first end of the suppression circuit is respectively connected to a power supply end of the control IC and a first end of the charging capacitor, and a second end of the suppression circuit is connected to the switch circuit;

The bleeder circuit is connected in parallel with the charging capacitor.

Preferably, the suppression circuit includes: a diode D2;

The cathode of the diode D2 is respectively connected to the power supply terminal of the control IC and the first terminal of the charging capacitor, and the anode of the diode D2 is connected to the switching circuit;

The cathode of the diode D2 is the first end of the suppression circuit, and the anode of the diode D2 is the second end of the suppression circuit.

Preferably, the bleeder circuit includes: a resistor R4;

A first terminal of the resistor R4 is connected between a first terminal of the charging capacitor and a power supply terminal of the control IC, and a second terminal of the resistor R4 is grounded.

Preferably, the switch circuit includes a switch tube, a voltage regulator tube ZD1, and a resistor R3;

A first end of the switching tube is connected to a second end of the suppression circuit, a second end of the switching tube is connected to a first end of the power supply circuit, and a third end of the switching tube is connected to the voltage stabilizing tube. The cathode of ZD1, the anode of the voltage regulator ZD1 is connected to the second end of the power supply circuit, the first end of the resistor R3 is connected to the second end of the switching tube, and the second end of the resistor R3 is connected to Between the third end of the switching tube and the cathode of the Zener tube ZD1.

Preferably, the switch is a transistor Q3;

The emitter of the transistor Q3 is the first end of the switch, the collector of the transistor Q3 is the second end of the switch, and the base of the transistor Q3 is the third end of the switch.

Preferably, the power supply circuit includes: a capacitor C1, a resistor R2, a diode D2, and an auxiliary winding of a transformer;

The first terminal of the resistor R2 and the first terminal of the capacitor C1 are connected to the second terminal of the switching tube together, the second terminal of the resistor R2 is connected to the cathode of the diode D2, and the diode D2 The anode of is connected to the first end of the auxiliary winding, the second end of the auxiliary winding is connected to the second end of the charging capacitor, and the second end of the capacitor C1 is connected to the anode of the voltage regulator tube ZD1 and connected to A second end of the charging capacitor, and the second end of the charging capacitor is further grounded;

The first terminal of the resistor R2 and the first terminal of the capacitor C1 are the first terminals of the power supply circuit, and the second terminal of the capacitor C2 and the anode of the voltage regulator tube ZD1 are the terminals. The second end of the power supply circuit, and the second end of the auxiliary winding is the third end of the power supply circuit.

Preferably, it further comprises: a current limiting resistor R1 connected in series between the output terminal of the bus voltage and the high-voltage signal input terminal of the control IC.

Preferably, it further comprises: a capacitor C3;

A first terminal of the capacitor C3 is connected to a power supply terminal of the control IC, and a second terminal of the capacitor C3 is grounded.

The present invention also provides a driving power supply, which includes the circuit for improving the startup time of the power supply.

Beneficial effect

The implementation of the circuit for improving the startup time of the power supply of the present invention has the following beneficial effects: By setting a startup adjustment circuit, the present invention can effectively shorten the startup time of the power supply when the power supply is started, and solves the problem of load on the load due to different or excessive power supply startup time. LED lights are inconsistent.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described below with reference to the accompanying drawings and embodiments. In the drawings:

FIG. 1 is a schematic structural diagram of a circuit for improving a startup time of a power supply according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a circuit for improving a startup time of a power supply according to an embodiment of the present invention.

Best Mode of the Invention

In order to have a clearer understanding of the technical features, objects, and effects of the present invention, detailed description will now be given with reference to the drawings.

In order to solve the problem of inconsistent startup time of the driving power source of the LED lamp or too long startup time, which causes the LED lamps to be uncoordinated, the present invention provides a circuit that can effectively shorten the startup time of the driving power source. Ensure that the start-up and start-up time of the drive power supply can meet the conditions for the LED lights to be uniformly illuminated within the input range of full voltage (90 ~ 305V).

Referring to FIG. 1, it is a schematic structural diagram of a circuit for improving a power-on startup time according to an embodiment of the present invention. The circuit for improving the start-up time of a power supply can be applied to a driving power supply for an LED lamp, such as a driving power supply for an indoor or outdoor LED street light, and can also be applied to a driving power supply for an IoT controller 150W street light.

As shown in FIG. 1, the circuit for improving the startup time of a power supply includes a control IC 10, a startup adjustment circuit 20, a switch circuit 30, a power supply circuit 50, and a charging capacitor 40 (C2).

Specifically, the high-voltage signal input terminal of the control IC 10 is connected to the rectified bus voltage output terminal, the power supply terminal of the control IC 10 is connected to the start-up adjustment circuit 20, and the start-up adjustment circuit 20 is connected to the switch circuit 30 and the charging capacitor 40 (C2), respectively. The switching circuit 30 and the charging capacitor 40 (C2) are also connected to the power supply circuit 50, respectively.

In the embodiment of the present invention, the startup adjustment circuit 20 includes a suppression circuit and a bleeder circuit.

The first end of the suppression circuit is respectively connected to the power supply terminal of the control IC 10 and the first end of the charging capacitor 40 (C2), and the second end of the suppression circuit is connected to the switch circuit 30; the bleeder circuit is connected in parallel to the charging capacitor 40 (C2).

In the present invention, by setting the circuit for improving the power-on start-up time, when the high-voltage signal input terminal of the control IC 10 receives the bus voltage output from the output terminal of the bus voltage (that is, the driving power has input voltage input), the control IC 10 performs internal processing after , To output the initial starting voltage from its power supply terminal to the charging capacitor 40 (C2) to charge the charging capacitor 40 (C2), and the present invention provides a startup regulating circuit 20 between the power supply terminal of the control IC 10 and the charging capacitor 40 (C2). It can make the initial startup voltage output by the power supply terminal of the control IC 10 only charge the charging capacitor 40 (C2) during startup, avoiding the initial startup voltage entering the switching circuit 30 to form a loop and causing the charging time to be longer, which can effectively shorten the startup startup time Further, the startup adjustment circuit 20 can also quickly discharge the voltage across the charging capacitor 40 (C2) after the drive power is turned off, providing faster time for the next startup and further shortening the startup time of the power supply.

Referring to FIG. 2, a schematic diagram of a circuit for improving a power-on startup time according to an embodiment of the present invention. As shown in FIG. 2, in this embodiment, the suppression circuit includes a diode D2.

The cathode of the diode D2 is connected to the power supply terminal of the control IC 10 and the first terminal of the charging capacitor 40 (C2), and the anode of the diode D2 is connected to the switching circuit 30; the cathode of the diode D2 is the first terminal of the suppression circuit, and the anode of the diode D2 is The second end of the suppression circuit.

In the embodiment of the present invention, the bleeder circuit includes: a resistor R4. The first terminal of the resistor R4 is connected between the first terminal of the charging capacitor 40 (C2) and the power supply terminal of the control IC 10, and the second terminal of the resistor R4 is grounded.

In the embodiment of the present invention, the switching circuit 30 includes a switching tube, a Zener tube ZD1 and a resistor R3.

The first end of the switching tube is connected to the second end of the suppression circuit, the second end of the switching tube is connected to the first end of the power supply circuit 50, the third end of the switching tube is connected to the cathode of the Zener tube ZD1, and the anode of the Zener tube ZD1 is connected The second end of the power supply circuit 50, the first end of the resistor R3 is connected to the second end of the switch tube, and the second end of the resistor R3 is connected between the third end of the switch tube and the cathode of the Zener tube ZD1.

Optionally, the switch can be a transistor Q3. The emitter of the transistor Q3 is the first end of the switch, the collector of the transistor Q3 is the second end of the switch, and the base of the transistor Q3 is the third end of the switch.

In the embodiment of the present invention, the power supply circuit 50 includes a capacitor C1, a resistor R2, a diode D2, and an auxiliary winding T1-A of the transformer.

The first terminal of the resistor R2 and the first terminal of the capacitor C1 are connected to the second terminal of the switch tube together. The second terminal of the resistor R2 is connected to the cathode of the diode D2, and the anode of the diode D2 is connected to the first terminal of the auxiliary winding T1-A. The second end of the auxiliary winding T1-A is connected to the second end of the charging capacitor 40 (C2), the second end of the capacitor C1 is connected to the anode of the Zener ZD1 and connected to the second end of the charging capacitor 40 (C2), and is charged The second end of the capacitor 40 (C2) is also grounded; the first end of the resistor R2 and the first end of the capacitor C1 are the first end of the power supply circuit 50, the second end of the capacitor C2 and the anode of the voltage regulator ZD1 are connected. Is the second end of the power supply circuit 50, and the second end of the auxiliary winding T1-A is the third end of the power supply circuit 50.

In the embodiment of the present invention, further, the circuit for improving the startup time of the power supply further includes: a current limiting resistor R1 connected in series between the output terminal of the bus voltage and the high-voltage signal input terminal of the control IC 10.

In the embodiment of the present invention, further, the circuit for improving the startup time of the power supply further includes: a capacitor C3. The first terminal of the capacitor C3 is connected to the power supply terminal of the control IC 10, and the second terminal of the capacitor C3 is grounded.

As shown in Figure 2, the circuit that improves the startup time of the power supply uses the topology of an NXP PFC + flyback integrated controller. Among them, the control IC 10 may use NXP SSL8516T. Of course, it can be understood that the control IC 10 may also use other ICs capable of achieving the same function, and the present invention is not specifically limited.

As shown in Figure 2, when the power input (not shown) is energized (that is, there is an input voltage input), after passing through the fuse and EMC filter circuit (fuse and EMC filter circuit are not shown), it is rectified. The voltage on the bus bar is the voltage at the HV point shown in FIG. 2 and is input to the high voltage signal input terminal (HV pin of pin 16) of the control IC 10, which is the power supply terminal of the control IC 10 after the internal processing of the control IC 10. (VCC pin of the first pin) forms the initial starting voltage, which directly charges the charging capacitor 40 (C2) connected to the power supply terminal of the control IC 10, and at the same time, due to the existence of the diode D2, the anode of the diode D2 at this time Connected to a low potential and the cathode to a high potential, so the diode D2 is in the off state, so that the initial start-up voltage only charges the charging capacitor 40 (C2) until the charging voltage on the charging capacitor 40 (C2) reaches the power supply terminal of the control IC 10. At the initial voltage, the control IC 10 starts to start, and after the control IC 10 starts, the auxiliary winding T1-A of the transformer supplies the operating voltage to the control IC 10, the driving power source starts to work, and then the LED light is turned on. Further, because the resistor R4 is provided, after the power is turned off, the voltage across the charging capacitor 40 (C2) can be quickly discharged through the resistor R4, thereby providing a faster time for the next startup.

Here, the diode D2 and the resistor R4 provided in the present invention can effectively shorten the startup time of the driving power supply. It can be seen from Figure 2 that if these two devices are not added to the circuit, that is to say, the first pin (VCC pin) of the control IC 40, the positive electrode of the charging capacitor 40 (C2), and the emitter of the transistor Q3 are on the same network. During the power-on and start-up process, the voltage on pin 1 (VCC pin) of IC 40 not only charges the external charging capacitor 40 (C2), but also a portion of the charging current is formed through the transmitting junction of transistor Q3 and the regulator ZD1 to ground. The circuit, that is to say, the existence of the transmitting junction of the transistor Q3 and the Zener ZD1 is equivalent to connecting an equivalent resistance. The value of this equivalent resistance depends on the reverse leakage current of the transmitting junction of the transistor Q3 and ZD1. Because the reverse current of the Zener ZD1 is formed by a few carriers, the reverse current is greatly affected by temperature. The higher the temperature is, the larger the reverse current of the voltage regulator ZD1 is, the smaller the equivalent resistance is, the longer the startup time is, and the longer the driving LED light is on. Through the comparison test, under the same conditions, the start-up and start-up time of the test power supply is different by about 300ms between the addition of these two devices and the absence of these two devices. That is to say, after adding these two devices, the input voltage (90-305V) ） Whether it is tested at high temperature or low temperature, the drive power-on start-up time is less than or equal to 450ms, and the two devices are not tested at the input voltage (90-305V). The start-up time is ≥750ms. Improved startup time regardless of whether the drive power supply is installed on the entire street light or several drive power supplies are installed in a luminaire. The startup time is satisfied: the LED lights up within 450ms, and the human It can't be distinguished visually, thereby solving the phenomenon of inconsistent start-up time and LED lights lighting at different speeds.

The present invention also provides a driving power supply, which includes the aforementioned circuit for improving the startup time of the power supply. The driving power source includes, but is not limited to, an LED driving power source, such as a driving power source for indoor or outdoor LED street lamps.

The above embodiments are only for explaining the technical concept and characteristics of the present invention, and the purpose thereof is to enable persons familiar with the technology to understand the content of the present invention and implement it accordingly, and should not limit the protection scope of the present invention. Any equivalent changes and modifications made to the scope of the claims of the present invention shall all fall within the scope of the claims of the present invention.

It should be understood that those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes should fall within the protection scope of the appended claims of the present invention.

Claims

A circuit for improving the startup time of a power supply, which is characterized by comprising: a control IC, a startup adjustment circuit, a switch circuit, a power supply circuit, and a charging capacitor;

The high-voltage signal input terminal of the control IC is connected to the output terminal of the rectified bus voltage, the power supply terminal of the control IC is connected to the startup adjustment circuit, and the startup adjustment circuit is connected to the switch circuit and the charging capacitor, respectively. A switching circuit and the charging capacitor are also connected to the power supply circuit, respectively.
The circuit according to claim 1, wherein the startup adjustment circuit comprises a suppression circuit and a bleeder circuit;

A first end of the suppression circuit is respectively connected to a power supply end of the control IC and a first end of the charging capacitor, and a second end of the suppression circuit is connected to the switch circuit;

The bleeder circuit is connected in parallel with the charging capacitor.
The circuit according to claim 2, wherein the suppression circuit comprises: a diode D2;

The cathode of the diode D2 is respectively connected to the power supply terminal of the control IC and the first terminal of the charging capacitor, and the anode of the diode D2 is connected to the switching circuit;

The cathode of the diode D2 is the first end of the suppression circuit, and the anode of the diode D2 is the second end of the suppression circuit.
The circuit according to claim 2, wherein the bleeder circuit comprises: a resistor R4;

A first terminal of the resistor R4 is connected between a first terminal of the charging capacitor and a power supply terminal of the control IC, and a second terminal of the resistor R4 is grounded.
The circuit according to claim 2, wherein the switch circuit comprises a switch tube, a voltage regulator tube ZD1, and a resistor R3;

A first end of the switching tube is connected to a second end of the suppression circuit, a second end of the switching tube is connected to a first end of the power supply circuit, and a third end of the switching tube is connected to the voltage stabilizing tube. The cathode of ZD1, the anode of the voltage regulator ZD1 is connected to the second end of the power supply circuit, the first end of the resistor R3 is connected to the second end of the switching tube, and the second end of the resistor R3 is connected to Between the third end of the switching tube and the cathode of the Zener tube ZD1.
The circuit according to claim 5, wherein the switching transistor is a transistor Q3;

The emitter of the transistor Q3 is the first end of the switch, the collector of the transistor Q3 is the second end of the switch, and the base of the transistor Q3 is the third end of the switch.
The circuit according to claim 5, wherein the power supply circuit comprises: a capacitor C1, a resistor R2, a diode D2, and an auxiliary winding of a transformer;

The first terminal of the resistor R2 and the first terminal of the capacitor C1 are connected to the second terminal of the switching tube together, the second terminal of the resistor R2 is connected to the cathode of the diode D2, and the diode D2 The anode of is connected to the first end of the auxiliary winding, the second end of the auxiliary winding is connected to the second end of the charging capacitor, and the second end of the capacitor C1 is connected to the anode of the voltage regulator tube ZD1 and connected to A second end of the charging capacitor, and the second end of the charging capacitor is further grounded;

The first terminal of the resistor R2 and the first terminal of the capacitor C1 are the first terminals of the power supply circuit, and the second terminal of the capacitor C2 and the anode of the voltage regulator tube ZD1 are the terminals. The second end of the power supply circuit, and the second end of the auxiliary winding is the third end of the power supply circuit.
The circuit according to claim 1, further comprising: a current limiting resistor R1 connected in series between an output terminal of the bus voltage and a high-voltage signal input terminal of the control IC.
The circuit according to claim 1, further comprising: a capacitor C3;

A first terminal of the capacitor C3 is connected to a power supply terminal of the control IC, and a second terminal of the capacitor C3 is grounded.
A driving power source, comprising the circuit for improving the starting time of a power source according to any one of claims 1-9.