CN218920280U

CN218920280U - Alternating-current high-voltage off-line noninductive intelligent lamp power supply circuit

Info

Publication number: CN218920280U
Application number: CN202222805963.1U
Authority: CN
Inventors: 蔡广明; 张路华; 陆鹏军; 高宇辰
Original assignee: Shenzhen Smart Semiconductor Ltd
Current assignee: Shenzhen Smart Semiconductor Ltd
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-04-25
Anticipated expiration: 2032-10-24

Abstract

The utility model discloses an alternating-current high-voltage off-line noninductive intelligent lamp power supply circuit, and relates to a lamp power supply circuit. The intelligent power supply comprises an input protection circuit, a surge protection circuit, a rectifying circuit, a buffer circuit, an off-line voltage stabilizer, an energy storage circuit, a filter circuit and an intelligent module, wherein the input protection circuit is connected to the surge protection circuit, the surge protection circuit is connected with the buffer circuit through the rectifying circuit, the rectifying circuit is further connected with the off-line voltage stabilizer, the energy storage circuit and the filter circuit respectively, the buffer circuit is further directly connected with the off-line voltage stabilizer, the off-line voltage stabilizer is connected with the energy storage circuit and the filter circuit respectively, and the filter circuit is connected with the intelligent module. The utility model can realize high PF, is easy to pass authentication, has small volume and is simple to debug.

Description

Alternating-current high-voltage off-line noninductive intelligent lamp power supply circuit

Technical Field

The utility model relates to a lamp power supply circuit, in particular to an alternating-current high-voltage off-line noninductive intelligent lamp power supply circuit.

Background

With the popularity of smart home products, smart home products are also layered endlessly, and in particular, various mainstream smart lamps such as bluetooth Mesh smart lamps, zigbee smart lamps and wifi+bluetooth smart lamps appear in the smart lamps, power supply circuits of an intelligent module or an MCU program singlechip are needed in these smart lamps, and for this requirement, corresponding circuits are provided by power supply scheme suppliers, wherein a representative circuit mode is shown in fig. 1: and power supply is realized by using a non-isolated buck mode.

The non-isolated step-down power supply circuit has the following defects;

a. through authentication, because the switching power supply is used for controlling and a PWM switch is used for realizing control, the problem of switching frequency exists, when the security passes, the conduction and radiation passes are difficult to tune, and a large number of security devices are required to be added for passing the authentication, as shown in figure 1, the U1 can generate switching frequency when working, the switching frequency can influence the conduction and radiation passes when passing the security authentication, and LF2, CX1, L1, LR1, ce1, ce2 and CD2 are required to be added for forming a security circuit for passing the security authentication;

the PF value is low, because the topological structure needs to use a large input capacitor to filter the peak of the input voltage and the MOS tube switch and because the input current of the buck converter is discontinuous, the capacitor is needed to absorb the alternating current to ensure stability, thus distortion of the input current in the circuit can be caused and the input current can not follow the current change, the PF value of the circuit caused by the structure can be lower than 0.8, and the PF value of the whole circuit is pulled down;

c. the topology circuit is large in size, DCM works mostly, a large-size transformer or inductor is needed for energy storage and voltage reduction in CCM working mode, the transformer or inductor is very large in size, and a plurality of elements are needed for interference suppression in addition to the over-authentication, so that the product size is increased;

d. the peripheral circuits are more, the switching power supply has switching frequency, a large number of safety devices are required to be subjected to safety and electromagnetic interference authentication and transformers, and the input and output voltage reduction topological circuit is required to be provided with a follow current diode D2 and absorption circuits CD2 and RD2, so that the required peripheral devices are more;

e. the high price is achieved because the transformer energy storage requiring the excessive safety specification authentication of a plurality of components and parts and the topology circuit also need a follow current diode and an absorption circuit, most of the components in the safety element such as LF1, CX2 and L1 can only achieve the current technical level that the plug-in components are added with the processing cost of the products, and the added cost of the components and the processing cost is high;

f. the debugging is difficult, because a plurality of safety components are needed to debug EMC safety certification and the like, the circuit is required to be debugged according to different parameters and component combinations, a lot of manpower and material resources are required to debug the circuit, and the inductance of the circuit, the inductance of the transformer T2 and leakage inductance are required to confirm the working mode of the circuit to confirm whether the circuit works normally, so that the debugging is very difficult;

g. the surge resistance is low, no built-in surge protection circuit exists, and the surge resistance is completely born by an external circuit, so that the surge resistance is low.

In summary, the utility model designs an alternating-current high-voltage off-line noninductive intelligent lamp power supply circuit.

Disclosure of Invention

Aiming at the defects existing in the prior art, the utility model aims to provide the alternating-current high-voltage off-line noninductive intelligent lamp power supply circuit which can realize high PF, is easy to pass authentication, has small volume and is simple to debug.

In order to achieve the above object, the present utility model is realized by the following technical scheme: the utility model provides an exchange high-voltage off-line noninductive formula intelligent lamp power supply circuit, including input protection circuit, surge protection circuit, rectifier circuit, buffer circuit, off-line type stabiliser, tank circuit, filter circuit and intelligent module, input protection circuit is connected to surge protection circuit, surge protection circuit passes through rectifier circuit and is connected with buffer circuit, rectifier circuit still links to each other with off-line type stabiliser, tank circuit, filter circuit respectively, buffer circuit still directly links to each other with off-line type stabiliser, off-line type stabiliser links to each other with tank circuit, filter circuit respectively, filter circuit links to each other with intelligent module.

The input protection circuit adopt a fuse F1, the surge protection circuit adopt piezo-resistor V1, rectifier circuit adopt rectifier bridge BD1, buffer circuit adopt second resistance R2, off-line type voltage regulator ware adopt voltage regulator ware UB1, tank circuit adopt first electric capacity C1, filter circuit adopt second electric capacity C2 and fifth electric capacity C5, fuse F1 one end is connected with the AC-L end, the fuse F1 other end links to each other with piezo-resistor V1's one end, rectifier bridge BD 1's 1 foot respectively, piezo-resistor V1 other end links to each other with AC-N end, rectifier bridge BD 1's 2 feet, rectifier bridge BD 1's 3 feet pass through second resistance R2 and voltage regulator ware UB 1's 5 feet, 6 feet, 7 feet and 8 feet link to each other, rectifier bridge BD 1's 4 feet pass through first electric capacity C1 negative pole, voltage regulator ware UB 1's 2 feet, second electric capacity C2 negative pole, fifth electric capacity C5 one end, first resistance R1 one end and intelligent module U1's 2 feet link to each other, first electric capacity C1 positive electrode C1 and the other end links to each other with intelligent module U1's 2 feet, the positive voltage regulator module U1's the other end links to each other with the first electric capacity U1, the other with the positive pressure regulator module 3 feet of 3 feet, the other.

Preferably, the input protection circuit functions as: when the circuit behind the protective tube F1 is short-circuited and high-current or electric leakage occurs, the element is automatically fused, so that the circuit behind the protective tube F1 is protected from fire.

Preferably, the surge circuit protects the whole circuit system from being damaged by surge voltage of an external power grid;

preferably, the rectifying circuit rectifies alternating current into direct current;

preferably, the buffer circuit slows down the charging time of the first capacitor C1, so that the input current wave does not generate distortion, and the PF value of the whole current can be adjusted by adjusting the size of the second resistor R2;

preferably, the off-line voltage stabilizer converts high voltage into stable voltage required by power supply of the intelligent lamp;

preferably, the tank circuit: when the MOSFET inside the voltage stabilizer UB1 is turned on, the input current supplies energy to the energy storage capacitor (the first capacitor C1) and the load, and when the MOSFET inside the voltage stabilizer UB1 is turned off, the energy storage capacitor (the first capacitor C1) supplies energy to the load;

preferably, the second capacitor C2 and the fifth capacitor C5 in the filter circuit are output filter capacitors, and filter out the output ripple and ripple current, so as to provide a smooth voltage and current for the load;

the beneficial effects of the utility model are as follows:

a. the method is easy to pass authentication, the line is driven linearly, the problem of switching frequency is avoided, disturbance is not generated when the MOS is turned on and off, conduction disturbance and radiation disturbance are not generated, and the cost is saved without adding any safety device;

the PF value is high, and the charging time of the storage capacitor of the first capacitor C1 is slowed down due to the buffer electricity of the second resistor R2, so that the input current cannot be distorted, and the current can be changed along with the voltage change, so that the PF value of the whole system cannot be lowered, and the high PF function is realized;

c. the circuit is small in size and easy to integrate, a large-size transformer and a plurality of safety rule components are not needed, the size can be extremely small, the circuit is convenient to integrate on an LED lamp to a large extent, the circuit becomes a light source integrating driving and lamps, and the size and the weight of the lamp are reduced;

d. the circuit is simple, the peripheral circuit is few and has no large-volume components, and the circuit is extremely simple;

e. the cost is low, because the linear driving scheme is adopted, the circuit is concise, so that the number of elements is very small, the cost can be greatly reduced, and the product is more competitive;

f. the debugging is simple, most circuits are integrated in the voltage stabilizer UB1, and conduction disturbance and radiation disturbance caused by MOS turn-off saves most authentication debugging time, only the PF value of the second resistor R2 is required to be debugged, the development period is saved, and the development cost is greatly reduced;

g. the surge resistance is high, and the surge protection circuit is arranged in the circuit, so that the surge bearing capacity of the product is greatly improved, and the reliability of the product is greatly protected.

Drawings

The utility model is described in detail below with reference to the drawings and the detailed description;

FIG. 1 is a circuit diagram of the background art of the utility model;

FIG. 2 is a block diagram of the operation of the present utility model;

fig. 3 is a schematic circuit implementation diagram of the present utility model.

Detailed Description

The utility model is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.

Referring to fig. 2 and 3, the present embodiment adopts the following technical scheme: the utility model provides an exchange high-voltage off-line noninductive formula intelligent lamp power supply circuit, including input protection circuit, surge protection circuit, rectifier circuit, buffer circuit, off-line type stabiliser, tank circuit, filter circuit and intelligent module, input protection circuit is connected to surge protection circuit, surge protection circuit passes through rectifier circuit and is connected with buffer circuit, rectifier circuit still links to each other with off-line type stabiliser, tank circuit, filter circuit respectively, buffer circuit still directly links to each other with off-line type stabiliser, off-line type stabiliser links to each other with tank circuit, filter circuit respectively, filter circuit links to each other with intelligent module.

It is noted that the input protection circuit adopts a fuse F1, the surge protection circuit adopts a piezoresistor V1, the rectifying circuit adopts a rectifying bridge BD1, the buffer circuit adopts a second resistor R2, the off-line voltage stabilizer adopts a voltage stabilizer UB1, the energy storage circuit adopts a first capacitor C1, the filter circuit adopts a second capacitor C2 and a fifth capacitor C5, one end of the fuse F1 is connected with an AC-L end, the other end of the fuse F1 is respectively connected with one end of the piezoresistor V1 and 1 pin of the rectifying bridge BD1, the other end of the piezoresistor V1 is respectively connected with an AC-N end and 2 pins of the rectifying bridge BD1, 3 pins of the rectifying bridge BD1 are connected with 5 pins, 6 pins, 7 pins and 8 pins of the voltage stabilizer UB1 through a second resistor R2, 2 pins of the voltage stabilizer UB1, a second capacitor C2 negative electrode, a fifth capacitor C5 end, one end of the first resistor R1 and 2 pins of the intelligent module U1, the positive pin of the intelligent module U1 is connected with the positive pin of the voltage stabilizer C1, and the other end of the intelligent module U1 is connected with the positive pin of the intelligent module U1 and the second resistor U1, and the other end of the intelligent module U1 is connected with the positive pin of the intelligent module 3 pin of the intelligent module is connected with the intelligent module 3.

The working principle of the specific embodiment is as follows: the AC-L/AC-N is respectively connected to a live wire and a zero line of 220V or other power supplies, surge absorption is carried OUT through a fuse tube F1 and a piezoresistor V1, then rectification is carried OUT through a rectifier bridge BD1, a second resistor R2 is used for supplying power to a MOSFET D pole in a voltage stabilizer UB1 after flushing, the off-line voltage stabilizer starts to start, an internal high-voltage current source starts to charge a first capacitor C1 (energy storage capacitor) of a VCC pin through a core D pole, the charging current stops after the VCC voltage rises to VCC_ON, meanwhile, the voltage stabilizer UB1 starts to work normally, and an OUT pin (3 pin) and a GND pin (2 pin) start to output voltage to supply power to a module or MCU of the intelligent lamp through C5H filtering; when the MOSFET in the UB1 is turned off, the first capacitor C1 (energy storage capacitor) supplies energy to the load, and normal and stable voltage and current output is maintained;

an AC synchronous detection circuit is integrated in the OFF-line voltage stabilizer UB1, the AC synchronous detection circuit detects an AC signal through a voltage dividing resistor arranged in the ground of the D pole, and when the chip detects that the D pole voltage is lower than VAC_SYNC_OFF, an internal power MOSFET is immediately turned on to charge a VCC capacitor;

an output current limiting circuit is arranged in the voltage stabilizer UB1, so that an external resistor is not required to be added for current detection, the circuit detects the output current of the off-line voltage stabilizer UB1 and directly controls the on-off of the off-line voltage stabilizer UB1, a maximum output current resistance is set in the circuit for avoiding the chip damage of the high current generated by overload, the circuit limits the maximum current when the overload occurs, and the under-voltage protection is triggered along with the falling of the output voltage;

the lightning surge protection circuit is arranged in the voltage stabilizer UB1, when a lightning surge occurs, the AC line voltage is coupled with a very high surge peak, if the surge peak occurs during the off-line voltage stabilizer charging window of the voltage stabilizer UB1 and the amplitude exceeds 100VdC, the system triggers the lightning surge protection, the off-line voltage stabilizer UB1 rapidly turns off the internal power MOS until the surge peak drops, and the UB1 off-line voltage stabilizer continuously outputs during the surge.

The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an exchange high-voltage off-line noninductive formula intelligent lamp power supply circuit includes input protection circuit, surge protection circuit, rectifier circuit, buffer circuit, off-line type stabiliser, tank circuit, filter circuit and intelligent module, input protection circuit is connected to surge protection circuit, surge protection circuit passes through rectifier circuit and is connected with buffer circuit, rectifier circuit still links to each other with off-line type stabiliser, tank circuit, filter circuit respectively, buffer circuit still directly links to each other with off-line type stabiliser, off-line type stabiliser links to each other with tank circuit, filter circuit respectively, filter circuit links to each other with intelligent module.

2. The alternating-current high-voltage off-line non-inductive intelligent lamp power supply circuit according to claim 1, wherein the input protection circuit adopts a fuse (F1), the surge protection circuit adopts a piezoresistor (V1), the rectification circuit adopts a rectifier bridge (BD 1), the buffer circuit adopts a second resistor (R2), the off-line voltage stabilizer adopts a voltage stabilizer (UB 1), the energy storage circuit adopts a first capacitor (C1), the filter circuit adopts a second capacitor (C2) and a fifth capacitor (C5), one end of the fuse (F1) is connected with an AC-L end, the other end of the fuse (F1) is respectively connected with one end of the piezoresistor (V1) and a 1 pin of the rectifier bridge (BD 1), the other end of the piezoresistor (V1) is respectively connected with an AC-N end and a 2 pin of the rectifier bridge (BD 1), a 3 pin of the rectifier bridge (BD 1) is connected with a 5 pin, a 6 pin, a 7 pin and an 8 pin of the voltage stabilizer (UB 1) through the second resistor (R2), and the other end of the fuse (F1) is connected with a positive electrode (C1) and a negative electrode (C1) of the first resistor (B1) through the second resistor (C2) and the positive electrode (C1) of the first resistor (C1) and the fifth capacitor (C1) respectively, the other end of the first resistor (R1) and the 1 pin of the intelligent module (U1) are connected with the 3 pin of the voltage stabilizer (UB 1), and the 7 pin and the 13 pin of the intelligent module (U1) are connected with the PWM switch.