CN211352514U - A drive circuit with stable and efficient output and a lamp using the same - Google Patents

Abstract

The utility model discloses a stable and high-efficiency driving circuit and a lamp using the same, which comprises a PFC correction boost module, a switch power supply module and a feedback module, wherein the input end of the PFC correction boost module is electrically connected with an external power supply, the input end of the switch power supply module is electrically connected with the output end of the PFC correction boost module, the output end of the switch power supply module can be connected with an external load to supply power to the external load, the input end of the feedback module is electrically connected with the output end of the switch power supply module, the output end of the feedback module is electrically connected with the feedback end of the switch power supply module, the electric energy utilization efficiency is improved, and the switch power supply module is used for feedback voltage reduction driving, so that when high input power factors and low input current harmonics are obtained, the ripple of output voltage is smaller, the voltage adjustment is faster, and the instantaneous response to, the voltage within a certain range is output, and the voltage can be adjusted in time according to the grade of the accessed load, so that the work is stable.

Description

A drive circuit with stable and efficient output and a lamp using the same

technical field

The utility model relates to an electronic circuit, in particular to a driving circuit.

Background technique

In the traditional lamp drive circuit, generally speaking, a drive circuit can only be adapted to a lamp of one specification. For lamps of different specifications, manufacturers must produce and develop multiple sets of drive circuits to match the lamps, resulting in manufacturing It is very troublesome and the cost is greatly increased. For users, in the process of use or maintenance, it must be adapted to the specifications, which is very inconvenient; at the same time, when the driving circuits of different specifications are forcibly matched with the lamps, the driving circuits cannot be used. Self-adjustment can easily lead to a great reduction in the power factor of the circuit, low power efficiency, and easy damage to the lamps.

Utility model content

The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a driving circuit with stable and efficient output and a lamp using the same.

The technical scheme adopted by the utility model is:

A drive circuit with stable output and high efficiency, including:

PFC calibration boosting module, the input end of the PFC calibration boosting module is electrically connected to the external power supply;

a switching power supply module, the input end of the switching power supply module is electrically connected with the output end of the PFC correction and boosting module, and the output end of the switching power supply module can be connected with an external load to supply power to the external load;

A feedback module, the input terminal of the feedback module is electrically connected with the output terminal of the switching power supply module, and the output terminal of the feedback module is electrically connected with the feedback terminal of the switching power supply module.

It also includes a rectification filter module, the input end of the rectifier filter module is electrically connected to the external AC power supply, and the output end of the rectifier filter module is electrically connected to the output end of the PFC correction boosting module.

The PFC correction boosting module includes a power correction unit, an input voltage feedback unit, a first output voltage feedback unit, a first output current feedback unit, a first inductor and a first switch unit;

The input end of the input voltage feedback unit is electrically connected to the output end of the rectification filter module and one end of the first inductor, respectively, and the output end of the input voltage feedback unit is electrically connected to the input voltage feedback end of the power correction unit. sexual connection;

The other end of the first inductor is respectively electrically connected to the input end of the first output voltage feedback unit, the input end of the first switching unit and the input end of the switching power supply module, and the first output voltage feedback unit The output terminal of the power correction unit is electrically connected to the output voltage feedback terminal of the power correction unit;

The output end of the first switch unit is grounded through the first output current feedback unit;

The output terminal of the first output current feedback unit is electrically connected to the output current feedback terminal of the power correction unit;

The control output end of the power calibration unit is electrically connected to the controlled end of the first switch unit.

The PFC correction boosting module further includes an energy storage unit and a diode D8;

One end of the energy storage unit is respectively electrically connected to the one end of the first inductor and the output end of the rectification filter module;

The anode of the diode D8 is electrically connected to the other end of the first inductor, and the cathode of the diode D8 is electrically connected to the other end of the energy storage unit and the input end of the switching power supply module, respectively.

The switching power supply module includes a switching power supply unit, a second switching unit, a second inductor and a resistance-capacitance unit; the feedback module includes a second output voltage feedback unit and a second output current feedback unit;

The output end of the PFC correction boosting module is respectively electrically connected to one end of the resistance-capacitance unit and one pole of the external load;

One end of the second inductor is electrically connected to the other end of the resistance-capacitance unit and the other pole of the external load respectively;

The input end of the second switch unit is electrically connected to the other end of the second inductor;

The output terminal of the second switching unit is grounded through the second output current feedback unit, and the output terminal of the second output current feedback unit is electrically connected to the output current feedback terminal of the switching power supply unit;

the second output voltage feedback unit detects the voltage across the second inductor, and the output end of the second output voltage feedback unit is electrically connected to the voltage feedback end of the switching power supply unit;

The control output end of the switching power supply unit is electrically connected to the second switching unit.

It also includes an overload and short-circuit protection module, one end of the overload and short-circuit protection module is respectively electrically connected to the output end of the PFC correction boosting module, the one end of the resistance-capacitance unit and the one pole of the external load;

The other end of the overload and short circuit protection module is respectively electrically connected to the one end of the second inductor, the other end of the resistance-capacitance unit and the other pole of the external load.

The second output voltage feedback unit includes a third inductor coupled with the second inductor, a resistor R24, one end of the third inductor is grounded, and the other end of the third inductor is connected to one end of the resistor R24 and the resistor R24 respectively. The voltage feedback end of the switching power supply unit is electrically connected, and the other end of the resistor R24 is grounded.

The second output current feedback unit includes a resistor R31 and a resistor R32, one end of the resistor R31 is electrically connected to one end of the resistor R32 and the output end of the second switch unit respectively, and the other end of the resistor R32 is electrically connected Grounding, the other end of the resistor R31 is electrically connected to the output current feedback end of the switching power supply unit.

The driving circuit disclosed above has at least one of the following advantages or beneficial effects:

In the driving circuit of the utility model, the PFC correction and boosting module boosts the external power supply, and performs power correction to improve the utilization efficiency of electric energy, and uses the switching power supply module to perform feedback and step-down driving, so as to obtain high input power factor and low input current harmonics At the same time, the ripple of the output voltage is small, the voltage adjustment is fast, it responds instantaneously to the vibration in the circuit, and outputs a certain range of voltage, which can be adjusted in time according to the level of the connected load, and can be reasonably matched with the connected load. Stablize.

The utility model also discloses a lamp, comprising a driving circuit with stable and efficient output disclosed in the above technical solution and an LED load, wherein the output end of the switching power supply module is connected with the LED load to supply power to the LED load.

The lamps disclosed above have at least one of the following advantages or beneficial effects:

The utility model can adapt to a variety of LED loads, keep the output stable, reduce the voltage ripple, has a faster adjustment speed, and has a higher power factor.

Description of drawings

The specific embodiments of the present utility model will be further described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of the principle structure of the driving circuit of the present invention.

FIG. 2 is a schematic circuit diagram of a rectifier filter module of the drive circuit of the present invention.

FIG. 3 is a schematic circuit diagram of the PFS correction boosting module of the driving circuit of the present invention.

4 is a schematic circuit diagram of a switching power supply module and a feedback module of the drive circuit of the present invention.

Detailed ways

This part will describe the specific embodiments of the present invention in detail, and the preferred embodiments of the present invention are shown in the accompanying drawings. Understand each technical feature and overall technical solution of the present invention, but it should not be construed as a limitation on the protection scope of the present invention.

In the description of the present utility model, it should be understood that the orientation descriptions related to orientations, such as up, down, front, rear, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings, only It is for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including this number, above, below, within, etc. are understood as including this number. If it is described that the first and the second are only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance, or indicating the number of the indicated technical features or the order of the indicated technical features. relation.

In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution .

As shown in Figure 1-Figure 4, a drive circuit with stable and efficient output includes:

PFC correction boosting module 1, the input end of the PFC correction boosting module 1 is electrically connected with the external power supply;

The switching power supply module 2, the input terminal of the switching power supply module 2 is electrically connected with the output terminal of the PFC correction and boosting module 1, and the output terminal of the switching power supply module 2 can be connected with an external load to supply power to the external load;

The feedback module 3 , the input terminal of the feedback module 3 is electrically connected to the output terminal of the switching power supply module 2 , and the output terminal of the feedback module 3 is electrically connected to the feedback terminal of the switching power supply module 2 .

For example, in some embodiments of this design, the switching power supply module 2 can output a voltage of 226V, and the design can be adjusted in time for the connection of various electrical loads in the 220V-230V range, and is compatible with various levels of electrical loads.

The PFC correction boosting module 1 boosts the external power supply and performs power correction to improve the power utilization efficiency, and uses the switching power supply module 2 to perform feedback buck drive to obtain high input power factor and low input current harmonics. The voltage ripple is small, the voltage adjustment is fast, it responds instantaneously to the vibration in the circuit, outputs a certain range of voltage, can be adjusted in time according to the level of the connected load, can reasonably match the connected load, and works stably

In some embodiments, as shown in FIG. 2 , a rectifier and filter module 4 is also included. The input end of the rectifier filter module 4 is electrically connected to the external AC power supply, and the output end of the rectifier filter module 4 is connected to the PFC correction and booster module 1 . The output terminal is electrically connected.

The rectifier filter module 4 may include components such as a rectifier bridge, a fuse F1, a varistor VR1, a varistor VR2, a filter capacitor CX1, and the like, to output stable direct current.

In some embodiments, the PFC correction boosting module 1 includes a power correction unit 11 , an input voltage feedback unit 12 , a first output voltage feedback unit 13 , a first output current feedback unit 14 , a first inductor T1 and a first switch unit 15;

The input end of the input voltage feedback unit 12 is electrically connected to the output end of the rectification filter module 4 and one end of the first inductor T1 respectively, and the output end of the input voltage feedback unit 12 is electrically connected to the input voltage feedback end of the power correction unit 11;

The other end of the first inductor T1 is electrically connected to the input end of the first output voltage feedback unit 12 , the input end of the first switching unit 15 and the input end of the switching power supply module 2 respectively, and the output end of the first output voltage feedback unit 13 is electrically connected. is electrically connected to the output voltage feedback terminal of the power correction unit 11;

The output end of the first switching unit 15 is grounded through the first output current feedback unit 14;

The output terminal of the first output current feedback unit 14 is electrically connected to the output current feedback terminal of the power correction unit 11;

The control output end of the power calibration unit 11 is electrically connected to the controlled end of the first switch unit 15 .

Among them, as shown in FIG. 3 , the power correction unit 11 can be selected from a conventional power correction chip, and the first switch unit can be selected from a triode or a MOS transistor, and a MOS transistor Q1 is used here.

The input voltage feedback unit 12 can be a voltage divider detection circuit composed of a resistor R3, a resistor R4, a resistor R5, and a resistor R6. One end of the resistor R3 is connected to the output end of the rectification filter module 4, and one end of the resistor R6 is connected to the input of the power correction unit 11. The voltage feedback terminal is electrically connected.

The first output current feedback unit 14 includes a resistor R13 and a resistor R14, one end of the resistor R13 is electrically connected to one end of the resistor R14 and the emitter of the MOS transistor Q1, the other end of the resistor R14 is grounded, and the other end of the resistor R13 is connected to the power calibration The output current feedback terminal of the unit 11 is electrically connected.

The first output voltage feedback unit 13 may be a voltage divider detection circuit composed of a resistor R17, a resistor R18, a resistor R19, and a resistor R20. One end of the resistor R17 is connected to the output end of the rectification filter module 4, and one end of the resistor R20 is connected to the power correction unit 11. The output voltage feedback terminal is electrically connected.

In some embodiments, as shown in FIG. 3 , the PFC correction boosting module 1 further includes an energy storage unit 16 and a diode D8;

One end of the energy storage unit 16 is electrically connected to one end of the first inductor T1 and the output end of the rectification filter module 4 respectively;

The anode of the diode D8 is electrically connected to the other end of the first inductor T1 , and the cathode of the diode D8 is electrically connected to the other end of the energy storage unit 16 and the input end of the switching power supply module 2 respectively.

The energy storage unit 16 can be selected from conventional capacitive elements, and the energy storage unit 16 can improve the boosting capability of the PFC correction boosting module 1 and make the adjustment more fluent and flexible.

In some embodiments, as shown in FIG. 4 , the switching power supply module 2 includes a switching power supply unit 21 , a second switching unit 22 , a second inductor T2 and a resistance-capacitance unit 23 ; the feedback module 3 includes a second output voltage feedback unit 31 and a second output current feedback unit 32;

The output end of the PFC correction boosting module 1 is electrically connected to one end of the resistance-capacitance unit 23 and one pole of the external load respectively;

One end of the second inductor T2 is electrically connected to the other end of the resistance-capacitance unit 23 and the other pole of the external load, respectively;

The input end of the second switch unit 22 is electrically connected to the other end of the second inductor T2;

The output terminal of the second switching unit 22 is grounded through the second output current feedback unit 32, and the output terminal of the second output current feedback unit 32 is electrically connected to the output current feedback terminal of the switching power supply unit 21;

The second output voltage feedback unit 31 detects the voltage across the second inductor T2, and the output terminal of the second output voltage feedback unit 31 is electrically connected to the voltage feedback terminal of the switching power supply unit 21;

The control output end of the switching power supply unit 21 is electrically connected to the second switching unit 22 .

Among them, the switching power supply unit 21 can be selected from a conventional switching power supply chip, the second switching unit 22 can be a conventional type triode or a MOS transistor, in one embodiment of this design, a MOS transistor Q2 is used, and the resistance-capacitance unit can be composed of resistors. R37, resistor R39 and capacitor E4 constitute;

In some embodiments, the second output voltage feedback unit 31 includes a third inductor T3 coupled with the second inductor T2, and a resistor R24. One end of the third inductor T3 is grounded, and the other end of the third inductor T3 is connected to the resistor R24. One end and the voltage feedback end of the switching power supply unit 21 are electrically connected, and the other end of the resistor R24 is grounded.

The third inductance T3 senses the voltage across the second inductance T2 to reflect the magnitude of the output voltage, so that the switching power supply unit 21 can control the driving of the second switching unit 22 .

In some embodiments, the second output current feedback unit 32 includes a resistor R31 and a resistor R32, one end of the resistor R31 is electrically connected to one end of the resistor R32 and the output end of the second switch unit 22 respectively, and the other end of the resistor R32 is grounded , the other end of the resistor R31 is electrically connected to the output current feedback end of the switching power supply unit 21 .

The switching power supply unit 21 controls the operation of the second switching unit 22 according to the feedback output voltage and output current, so as to adjust the voltage and current output to both ends of the load.

In some embodiments, an overload short circuit protection module 5 is also included, and one end of the overload short circuit protection module 5 is respectively electrically connected to the output end of the PFC correction boosting module 1, one end of the resistance-capacitance unit 23 and one pole of the external load;

The other end of the overload short circuit protection module 5 is electrically connected to one end of the second inductor T2, the other end of the resistance-capacitance unit 23 and the other pole of the external load, respectively.

The overload short-circuit protection module 5 can be composed of a pressure-sensitive element TV1. When the output voltage is too high or the output current is too large, the output voltage increases instantaneously, and the pressure-sensitive element can be turned on, thereby protecting the load from damage.

A specific embodiment of the present invention also discloses a lamp, comprising a drive circuit with stable and efficient output disclosed in any of the above embodiments, and an LED load. The output end of the switching power supply module is connected to the LED load to supply power to the LED load.

The utility model can adapt to a variety of LED loads, keep the output stable, reduce the voltage ripple, has a faster adjustment speed, and has a higher power factor.

Those skilled in the art can easily understand that, under the premise of no conflict, the above preferred modes can be freely combined and superimposed.

The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by those of ordinary skill in the technical field, the present utility model can also be used without departing from the purpose of the present utility model. make various changes.

Claims (9)

1. A stable and efficient output driver circuit, comprising:

the input end of the PFC correction boosting module is electrically connected with an external power supply;

the input end of the switching power supply module is electrically connected with the output end of the PFC correction boosting module, and the output end of the switching power supply module can be connected with an external load to supply power to the external load;

and the input end of the feedback module is electrically connected with the output end of the switching power supply module, and the output end of the feedback module is electrically connected with the feedback end of the switching power supply module.

2. The driving circuit according to claim 1, wherein: the input end of the rectification filter module is electrically connected with an external alternating current power supply, and the output end of the rectification filter module is electrically connected with the output end of the PFC correction boosting module.

3. A stable and efficient output driver circuit as claimed in claim 2, wherein: the PFC correction boosting module comprises a power correction unit, an input voltage feedback unit, a first output current feedback unit, a first inductor and a first switch unit;

the input end of the input voltage feedback unit is electrically connected with the output end of the rectification filter module and one end of the first inductor respectively, and the output end of the input voltage feedback unit is electrically connected with the input voltage feedback end of the power correction unit;

the other end of the first inductor is electrically connected with the input end of the first output voltage feedback unit, the input end of the first switch unit and the input end of the switch power supply module respectively, and the output end of the first output voltage feedback unit is electrically connected with the output voltage feedback end of the power correction unit;

the output end of the first switch unit is grounded through the first output current feedback unit; the output end of the first output current feedback unit is electrically connected with the output current feedback end of the power correction unit;

and the control output end of the power correction unit is electrically connected with the controlled end of the first switch unit.

4. A stable and efficient output driver circuit as claimed in claim 3, wherein: the PFC correction boost module further comprises an energy storage unit and a diode D8;

one end of the energy storage unit is electrically connected with the one end of the first inductor and the output end of the rectification filter module respectively;

the anode of the diode D8 is electrically connected to the other end of the first inductor, and the cathode of the diode D8 is electrically connected to the other end of the energy storage unit and the input terminal of the switching power supply module, respectively.

5. The driving circuit according to claim 1, wherein: the switching power supply module comprises a switching power supply unit, a second switching unit, a second inductor and a resistance-capacitance unit; the feedback module comprises a second output voltage feedback unit and a second output current feedback unit;

the output end of the PFC correction boosting module is electrically connected with one end of the resistance-capacitance unit and one pole of an external load respectively;

one end of the second inductor is electrically connected with the other end of the resistance-capacitance unit and the other end of the external load respectively;

the input end of the second switch unit is electrically connected with the other end of the second inductor;

the output end of the second switch unit is grounded through the second output current feedback unit, and the output end of the second output current feedback unit is electrically connected with the output current feedback end of the switch power supply unit;

the second output voltage feedback unit detects the voltages at two ends of the second inductor, and the output end of the second output voltage feedback unit is electrically connected with the voltage feedback end of the switching power supply unit;

and the control output end of the switching power supply unit is electrically connected with the second switching unit.

6. The driving circuit of claim 5, wherein: the power supply further comprises an overload short-circuit protection module, wherein one end of the overload short-circuit protection module is electrically connected with the output end of the PFC correction boosting module, the one end of the resistance-capacitance unit and the one pole of the external load respectively;

the other end of the overload short-circuit protection module is electrically connected with the one end of the second inductor, the other end of the resistance-capacitance unit and the other end of the external load respectively.

7. The driving circuit of claim 5, wherein: the second output voltage feedback unit comprises a third inductor and a resistor R24, wherein the third inductor is coupled with the second inductor, one end of the third inductor is grounded, the other end of the third inductor is respectively electrically connected with one end of the resistor R24 and the voltage feedback end of the switching power supply unit, and the other end of the resistor R24 is grounded.

8. The driving circuit of claim 5, wherein: the second output current feedback unit comprises a resistor R31 and a resistor R32, one end of the resistor R31 is respectively connected with one end of the resistor R32 and the output end of the second switch unit, the other end of the resistor R32 is grounded, and the other end of the resistor R31 is electrically connected with the output current feedback end of the switch power supply unit.

9. A lamp comprising a stable and efficient output driving circuit as claimed in any one of claims 1 to 8 and an LED load, wherein the output terminal of the switching power supply module is connected to the LED load to supply power to the LED load.

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