阅读说明：本技术 Led驱动电路 (LED drive circuit ) 是由 张显伟 周明兴 于 2020-06-22 设计创作，主要内容包括：本申请公开了一种LED驱动电路,属于集成电路领域。该LED驱动电路包括分压模块、电容充电抑制模块、第一电容、纹波电流滤除模块、LED模块,分压模块用于对整流模块输出的电压进行分压,分压模块与电容充电抑制模块电连接,第一电容、电容充电抑制模块串接于整流模块与地之间,LED模块、纹波电流滤除模块串接后与第一电容并联,实现了驱动电路的功率因素高、LED模块点亮时无频闪的兼容,且流过LED的电流恒定。(The application discloses LED drive circuit belongs to the integrated circuit field. This LED drive circuit includes the voltage divider module, the electric capacity suppression module that charges, first electric capacity, ripple current filtering module, the LED module, the voltage divider module is used for carrying out the partial pressure to the voltage of rectifier module output, the voltage divider module charges with the electric capacity and suppresses the module electricity and is connected, first electric capacity, the electric capacity suppression module that charges concatenates between rectifier module and ground, the LED module, ripple current filtering module concatenates the back and connects in parallel with first electric capacity, it is high to have realized drive circuit's power factor, there is not stroboscopic compatibility when the LED module lights, and the electric current that flows through LED is invariable.)

1. The utility model provides a LED drive circuit, its characterized in that, includes partial pressure module, electric capacity charge suppression module, first electric capacity, ripple current filtering module, LED module, the partial pressure module is used for carrying out the partial pressure to the voltage of rectifier module output, the partial pressure module with electric capacity charge suppression module electricity is connected, first electric capacity the electric capacity charge suppression module concatenate in between rectifier module and the ground, the LED module ripple current filtering module concatenate after the back with first electric capacity is parallelly connected.

2. The LED driving circuit according to claim 1, wherein the rectifying module, the LED module, the ripple current filtering module, and the capacitor charging suppression module are connected in series in sequence.

3. The LED driving circuit according to claim 1, wherein the rectifying module, the ripple current filtering module, the LED module, and the capacitor charging suppression module are connected in series in sequence.

4. The LED driving circuit according to claim 1, wherein an input terminal of the voltage divider module is connected between the LED module and the ripple current filtering module, and an output terminal of the voltage divider module is connected to the capacitor charging suppression module.

5. The LED driving circuit according to claim 1, wherein the voltage dividing module is connected in series between the rectifying module and ground.

6. The LED driving circuit according to claim 1, wherein the rectifying module, the first capacitor, the capacitor charging suppressing module and the ground are connected in series in sequence.

7. The LED driving circuit according to claim 1, wherein the rectifying module, the capacitor charging suppressing module, the first capacitor and the ground are sequentially connected in series.

8. The LED driving circuit according to claim 1, wherein a filtering module is connected in series between the voltage dividing module and the capacitance charging suppression module.

9. The LED driving circuit according to claim 1, wherein a power regulator is connected in series between the voltage dividing module and the capacitance charging suppression module.

10. The LED driving circuit according to claim 1, wherein the capacitor charging suppressing module includes a first operational amplifier, a first resistor, and a first switching tube, the first switching tube and the first resistor are sequentially connected in series between the first capacitor and ground, the first operational amplifier has a positive input terminal and a negative input terminal, the first switching tube at least includes a gate, the positive input terminal of the first operational amplifier is connected to the voltage dividing module, the negative input terminal of the first operational amplifier is connected between the first resistor and the first switching tube, and the output terminal of the first operational amplifier is connected to the gate of the first switching tube.

11. The LED driving circuit according to claim 1, wherein the ripple current filtering module includes a second resistor, a second switching tube, and a second operational amplifier, the second operational amplifier has a forward input terminal and a reverse input terminal, the second switching tube includes at least a gate, the second switching tube and the second resistor are connected in series between the LED module and the capacitor charging suppression module, the forward input terminal of the second operational amplifier is connected to a reference voltage terminal, the reverse input terminal of the second operational amplifier is connected between the second switching tube and the second resistor, and the output terminal of the second operational amplifier is electrically connected to the gate of the second switching tube.

12. The LED driving circuit according to claim 1, wherein the voltage dividing module comprises a third resistor and a fourth resistor connected in series, and the capacitor charging suppressing module is connected between the third resistor and the fourth resistor.

Technical Field

The application belongs to the field of integrated circuits, and particularly relates to an LED driving circuit.

Background

With the development of lighting technology, LED lamps have gone into thousands of households. Before the LED lamp is turned on, the LED lamp needs to be driven and turned on by a driving circuit.

In the prior art, a multi-section linear driving circuit is generally used for driving the LED lamp. In a specific driving process, the multi-section linear driving circuit is switched on in a segmented mode along with the input voltage, the current input into the multi-section linear driving circuit is approximate to a sine waveform, and the power factor value is high; however, since the LED is turned on in stages according to the input voltage, the current flowing through the LED is related to the input voltage frequency, and the current flowing through the LED contains a power frequency ripple, so that the LED is stroboscopic when the LED is turned on. If a filtering first capacitor with larger capacity is added in the multi-section linear driving circuit to improve the rectified valley voltage, the total voltage of the LED lamp is lower than the rectified valley voltage, so that the LED lamp driving current is not influenced by the frequency of the alternating current input voltage, the current flowing through the LED lamp does not contain power frequency ripples, and the LED lamp does not have stroboflash when being in a lighting state; however, the first filtering capacitor has the characteristics of large capacity, high voltage and slow discharge, so that the first filtering capacitor can be charged only at the peak of the input voltage, the conduction angle of the input current is small, and the power factor of the driving circuit is low. Therefore, the driving circuit in the prior art has the problems that the driving circuit drives the LED lamp to be lighted, the power factor is high, and the LED lamp is not stroboscopic when being lighted.

Disclosure of Invention

The embodiment of the application aims to provide an LED drive circuit, which can solve the problems that the drive circuit cannot be compatible with the advantages of high power factor and no stroboscopic effect when an LED lamp is in a lighting state in the process of driving the LED lamp to be lit.

In order to solve the technical problem, the present application is implemented as follows:

the embodiment of the application provides a light-emitting diode (LED) driving circuit, charge suppression module, first electric capacity, ripple current filtering module, LED module including voltage division module, electric capacity, voltage division module is used for carrying out the partial pressure to the voltage of rectifier module output, voltage division module with electric capacity charges and suppresses the module electricity and connects, first electric capacity the electric capacity charge suppression module concatenate in between rectifier module and the ground, the LED module ripple current filtering module concatenate after the back with first electric capacity is parallelly connected.

Optionally, the rectifier module, the LED module, the ripple current filtering module, and the capacitor charging suppression module are connected in series in sequence.

Optionally, the rectification module, the ripple current filtering module, the LED module, and the capacitor charging suppression module are sequentially connected in series.

Optionally, an input end of the voltage division module is connected between the LED module and the ripple current filtering module, and an output end of the voltage division module is connected to the capacitor charging suppression module.

Optionally, the voltage dividing module is connected in series between the rectifying module and ground.

Optionally, the rectifying module, the first capacitor, the capacitor charging suppression module, and the ground are sequentially connected in series.

Optionally, the rectifying module, the capacitor charging suppression module, the first capacitor, and the ground are sequentially connected in series.

Optionally, a filtering module is connected in series between the voltage dividing module and the capacitor charging suppression module.

Optionally, a power regulator is connected in series between the voltage dividing module and the capacitance charging suppression module.

Optionally, the capacitor charging suppression module includes a first operational amplifier, a first resistor, and a first switch tube, the first switch tube and the first resistor are sequentially connected in series between the first capacitor and the ground, a positive phase input end of the first operational amplifier is connected to the voltage division module, an inverted phase input end of the first operational amplifier is connected to the first resistor and between the first switch tube, and an output end of the first operational amplifier is connected to a gate of the first switch tube.

Optionally, the ripple current filtering module includes a second resistor, a second switch tube, and a second operational amplifier, the second switch tube and the second resistor are connected in series between the LED module and the capacitor charging suppression module, a positive phase input end of the second operational amplifier is connected to the reference voltage end, a negative phase input end of the second operational amplifier is connected to the second switch tube and between the second resistor, and an output end of the second operational amplifier is electrically connected to a gate of the second switch tube.

Optionally, the voltage dividing module includes a third resistor and a fourth resistor connected in series, and the capacitor charging suppression module is connected between the third resistor and the fourth resistor.

In the embodiment of the application, the voltage output by the rectifying module is divided by the voltage dividing module, the voltage dividing module is electrically connected with the capacitor charging inhibiting module, the first capacitor and the capacitor charging inhibiting module are connected in series between the rectifying module and the ground, the LED module and the ripple current filtering module are connected in series and then connected in parallel with the first capacitor, the rectifying module rectifies and outputs the mains supply to the voltage dividing module and the first capacitor, the first capacitor starts to charge after obtaining the current, the capacitor charging inhibiting module collects the first divided voltage obtained by the voltage dividing module after dividing the voltage output by the rectifying module and the second divided voltage in the capacitor charging inhibiting module, and is continuously and dynamically switched on and switched off according to the first divided voltage and the second divided voltage, therefore, the time from the beginning of charging to full charging of the first capacitor can be prolonged (namely, the conduction angle of the current of the rectified output is enlarged), so that the power factor of the driving circuit is high; in addition, the rectifier module can carry out rectification output to LED module, ripple current filtering module with the commercial power for LED module is lighted and ripple current filtering module constantly developments are switched on and are cut off, thereby the power frequency ripple in the electric current of filtering input to LED module, do not have the stroboscopic when making LED module light, has realized that drive circuit's power factor is high through foretell mode, does not have stroboscopic compatibility when LED module lights, and the electric current that flows through LED is invariable.

Drawings

Fig. 1 is a circuit connection block diagram of an LED driving circuit according to an embodiment of the present application;

FIG. 2 is a block diagram of a circuit connection of an LED driving circuit according to an embodiment of the present application;

fig. 3 is a circuit connection block diagram of an LED driving circuit according to an embodiment of the present application;

FIG. 4 is a block diagram of a circuit connection of an LED driving circuit according to an embodiment of the present application;

fig. 5 is a circuit diagram of an LED driving circuit according to an embodiment of the present application;

fig. 6 is a circuit diagram of an LED driving circuit according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The LED driving circuit provided in the embodiments of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.

The embodiment of the application provides an LED driving circuit, which is connected to a rectifying module 100 for rectifying mains supply, wherein the rectifying module 100 may be a bridge-type rectifying module. Specifically, the LED driving circuit includes a voltage dividing module 101, a capacitor charging suppression module 102, a first capacitor C1, a ripple current filtering module 103, and an LED module 105, where the voltage dividing module 101 is configured to divide the voltage output by the rectifying module 100, the voltage dividing module 101 is electrically connected to the capacitor charging suppression module 102, the first capacitor C1 and the capacitor charging suppression module 102 are connected in series between the rectifying module 100 and the ground, and the LED module 105 and the ripple current filtering module 103 are connected in series and then connected in parallel to the first capacitor C1.

The LED driving circuit divides the voltage output by the rectifying module 100 through the voltage dividing module 101, the voltage dividing module 101 is electrically connected with the capacitor charging suppression module 102, the first capacitor C1 and the capacitor charging suppression module 102 are connected in series between the rectifying module 100 and the ground, the LED module 105 and the ripple current filtering module 103 are connected in series and then connected in parallel with the first capacitor C1, the rectifying module 100 rectifies the commercial power and respectively outputs the commercial power to the voltage dividing module 101 and the first capacitor C1, the first capacitor C1 starts charging after obtaining the current, the capacitor charging suppression module 102 collects the first divided voltage obtained by dividing the voltage output by the voltage dividing module 101 to the rectifying module 100 and the second divided voltage in the capacitor charging suppression module, and the first divided voltage and the second divided voltage are continuously and dynamically switched on and switched off according to the first divided voltage and the second divided voltage, so that the time from the start of charging to the full charging of the first capacitor C1 (namely, the conduction angle of the current output, the power factor of the driving circuit is high; in addition, the rectifier module 100 rectifies and outputs the commercial power to the LED module 105 and the ripple current filtering module 103, so that the LED module 105 is turned on and the ripple current filtering module 103 is continuously and dynamically turned on and off, thereby filtering the power frequency ripple input to the current of the LED module 105, so that the LED module 105 is turned on without stroboflash, and by adopting the above method, the power factor of the driving circuit is high, the LED module 105 is turned on without stroboflash compatibility, and the current flowing through the LED is constant.

Specifically, the specific connection modes of the LED module 105 and the ripple current filtering module 103 include, but are not limited to, the following two types:

the first method comprises the following steps: as shown in fig. 1, the rectifier module 100, the LED module 105, the ripple current filtering module 103, and the capacitor charging suppression module 102 are connected in series in sequence.

And the second method comprises the following steps: as shown in fig. 2, the rectifying module 100, the ripple current filtering module 103, the LED module 105, and the capacitor charging suppressing module 102 are connected in series in sequence.

Optionally, specific connection modes of the voltage dividing module 101 include, but are not limited to, the following two types:

the first method comprises the following steps: as shown in fig. 1 and 2, the voltage dividing module 101 is connected in series between the rectifying module 100 and the ground.

And the second method comprises the following steps: as shown in fig. 3, an input end of the voltage dividing module 101 is connected between the LED module 105 and the ripple current filtering module 103, and an output end of the voltage dividing module 101 is connected to the capacitor charging suppression module 102.

Optionally, the specific connection manner of the first capacitor C1 and the capacitive charging suppression module 102 includes, but is not limited to, the following two ways:

the first method comprises the following steps: as shown in fig. 1 and 2, the rectifier module 100, the first capacitor C1, the capacitor charging suppression module 102, and ground are connected in series in sequence.

And the second method comprises the following steps: as shown in fig. 4, the rectifying module 100, the capacitor charging suppressing module 102, the first capacitor C1 and the ground are sequentially connected in series.

Optionally, the voltage dividing module 101 includes a third resistor R3 and a fourth resistor R4 connected in series, and the capacitor charging suppressing module 102 is connected between the third resistor R3 and the fourth resistor R4.

Specifically, as shown in fig. 5, as one embodiment, the third resistor R3 and the fourth resistor R4 are connected in series between the rectifier module 100 and the ground; as shown in fig. 6, in another embodiment, the third resistor R3 and the fourth resistor R4 are connected in series between the LED module 105 and the ground.

Optionally, as shown in fig. 5 and 6, the capacitor charging suppression module 102 includes a first operational amplifier U1, a first resistor R1, and a first switch Q1, the first operational amplifier U1 has a positive input end and a negative input end, the first switch Q1 at least includes a gate, the first switch Q1 and the first resistor R1 are sequentially connected in series between the first capacitor C1 and the ground, the positive input end of the first operational amplifier U1 is connected to the voltage division module 101, the negative input end of the first operational amplifier U1 is connected between the first resistor R1 and the first switch Q1, and the output end of the first operational amplifier U1 is connected to the gate of the first switch Q1.

The positive phase input end of the first operational amplifier U1 is configured to collect a voltage divided by the rectifying module 100 by the voltage dividing module 101 (for example, the positive phase input end of the first operational amplifier U1 is connected between the third resistor R3 and the fourth resistor R4, and collects a voltage between the third resistor R3 and the fourth resistor R4, that is, a first divided voltage), the negative phase input end of the first operational amplifier U1 is configured to collect a voltage between the first resistor R1 and the first switching tube Q1 (that is, a second divided voltage inside the first operational amplifier U1), the first operational amplifier U1 is configured to compare the voltage collected by the positive phase input end with the voltage collected by the negative phase input end, and when the voltage collected by the positive phase input end is greater than the voltage collected by the negative phase input end, the first switching tube Q1 is controlled to be turned on; when the voltage collected by the non-inverting input end is less than or equal to the voltage collected by the inverting input end, the first switching tube Q1 is controlled to be cut off.

At the beginning, the voltage divided by the voltage dividing module 101 for the rectifying module 100 is collected at the positive phase input end; since the first resistor R1 is grounded, the voltage collected by the inverting input terminal is a low level signal, and therefore, when the voltage collected by the non-inverting input terminal is greater than the voltage collected by the inverting input terminal, the first operational amplifier U1 controls the first switching tube Q1 to be turned on, and the charging first capacitor C1 starts to be charged, so that the voltage collected by the inverting input terminal gradually increases until the voltage collected by the non-inverting input terminal is equal to the voltage collected by the inverting input terminal, and the first switching tube Q1 is controlled to be turned off. Therefore, the voltage collected by the non-inverting input end is larger than the voltage collected by the inverting input end, the first operational amplifier U1 controls the first switch tube Q1 to be turned on, the charging first capacitor C1 starts to be charged, and the cyclic dynamic on/off is realized, so that the time from the start of charging to the full charging of the first capacitor C1 is suppressed.

Optionally, as shown in fig. 5 and 6, the ripple current filtering module 103 includes a second resistor R2, a second switch Q2, and a second operational amplifier U2, the second operational amplifier U2 has a positive input end and a negative input end, the second switch Q2 at least includes a gate, the second switch Q2 and the second resistor R2 are connected in series between the LED module 105 and the capacitor charging suppression module 102, the positive input end of the second operational amplifier U2 is connected to the reference voltage end, the negative input end of the second operational amplifier U2 is connected between the second switch Q2 and the second resistor R2, and the output end of the second operational amplifier U2 is electrically connected to the gate of the second switch Q2.

The positive phase input end of the second operational amplifier U2 is configured to collect a voltage output by the reference voltage end, the negative phase input end of the second operational amplifier U2 is configured to collect a voltage between the second switching tube Q2 and the second resistor R2, and the positive phase input end collects a voltage output by the reference voltage end at an initial time, and since the second resistor R2 is connected to the first switching tube Q1 (the first switching tube Q1 is turned off at the initial time), the second resistor R2 is equivalent to ground when the first switching tube Q1 is turned off, so that the voltage between the second switching tube Q2 and the second resistor R2 is a low level signal, and thus the voltage collected by the positive phase input end of the second operational amplifier U2 is greater than the voltage collected by the negative phase input end, the second operational amplifier U2 controls the second switching tube Q2 to be turned on, and the LED module 105 is turned on. Under the state that the first operational amplifier U1 controls the first switch tube Q1 to be turned on and the first capacitor C1 starts to be charged, the voltage collected by the inverting input end of the second operational amplifier U2 gradually increases until the voltage collected by the non-inverting input end is equal to the voltage collected by the inverting input end, and the second switch tube Q2 is controlled to be turned off. Therefore, the voltage collected by the positive phase input end of the second operational amplifier U2 is larger than the voltage collected by the negative phase input end, the second operational amplifier U2 controls the second switching tube Q2 to be switched on, and the cycle is dynamically switched on and off, so that power frequency ripples in the current input to the LED module 105 are filtered, and the LED module 105 is not stroboscopic when being turned on.

In addition, the first capacitor C1, the ripple current filtering module 103, and the LED module 105 form a loop, when the first capacitor C1 discharges, the loop provides a driving current for the LED module 105, and the ripple current filtering module 103 can still filter the power frequency ripple in the driving current input to the LED module 105 according to the above working principle.

Further, in order to enable the capacitor charging suppression module 102 to more accurately suppress the charging of the first capacitor C1 in consideration of the instability of the utility power, a power regulator 107 may be connected in series between the voltage division module 101 and the capacitor charging suppression module 102. The power regulator 107 processes the voltage divided by the rectifying module 100 according to the voltage dividing module 101, so that the first divided voltage input to the capacitive charging suppression module 102 after processing changes with the change of the commercial power. Specifically, the first divided voltage input to the capacitive charge suppression module 102 after processing is in inverse proportion to the voltage output by the rectification module 100 (i.e., if the mains voltage becomes low, the voltage output by the rectification module 100 also becomes low, the first divided voltage input to the capacitive charge suppression module 102 after processing becomes high, and if the mains voltage becomes high, the voltage output by the rectification module 100 also becomes high, the first divided voltage input to the capacitive charge suppression module 102 after processing becomes high).

As shown in fig. 5 and 6, a filtering module 106 may be connected between the voltage dividing module 101 and the capacitance charging suppression module 102 in series. The filtering module 106 may include a second capacitor C2 and a fifth resistor R5 connected in series, the fifth resistor R5 is connected between the third resistor R3 and the fourth resistor R4, the second capacitor C2 is grounded, and the power regulator 107 is connected between the fifth resistor R5 and the second capacitor C2. The filtering module 106 is used for filtering the current input to the capacitance charging suppression module 102 to remove noise.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present application.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.