CN222621233U - LED driving power supply circuit and LED lamp - Google Patents
LED driving power supply circuit and LED lamp Download PDFInfo
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- CN222621233U CN222621233U CN202421130515.9U CN202421130515U CN222621233U CN 222621233 U CN222621233 U CN 222621233U CN 202421130515 U CN202421130515 U CN 202421130515U CN 222621233 U CN222621233 U CN 222621233U
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Abstract
The utility model discloses an LED driving power supply circuit and an LED lamp, and relates to the technical field of LED lamps. The LED driving power supply circuit comprises a first constant current driving circuit, a second constant current driving circuit, a switching circuit and a control circuit. When the control circuit detects that the voltage value of the first driving voltage is within a preset range value, the first constant current driving circuit outputs the first driving voltage to provide a driving power supply. When the control circuit detects that the voltage value of the first driving voltage is out of the preset voltage range, the control switch circuit switches the passage between the first constant current driving circuit and the power output end to be turned off, and the passage between the second constant current driving circuit and the power output end is turned on, and at the moment, the second constant current driving circuit outputs the second driving voltage to provide the driving power. Therefore, when the output of the first constant current drive circuit is abnormal, the utility model can be switched to the second constant current drive circuit to output the drive power supply, and is suitable for application scenes with higher requirements on the drive power supply.
Description
Technical Field
The utility model relates to the technical field of LED lamps, in particular to an LED driving power supply circuit and an LED lamp.
Background
The light emitting Diode (LIGHT EMITTING Diode, LED) has the advantages of environmental protection, energy saving, earthquake resistance, long service life and the like, and is widely applied. The LED is a low-voltage direct current device driven by constant current, so that a power grid cannot be directly connected with the LED to supply power to the LED, and the power of the power grid is converted by driving a power supply circuit to supply power to the LED.
However, in the use process of the LED lamp, the LED driving power supply circuit is most easily damaged, and the lamp is easily dead. In some LED driving power application scenarios with high requirements for driving power, such as emergency lighting scenarios, existing LED driving power cannot meet the requirements.
Disclosure of utility model
The utility model mainly aims to provide an LED driving power supply circuit which aims to achieve the purpose of driving output driving power supply in two ways and solve the problem that the existing LED driving power supply circuit is easy to cause lamp death.
In order to achieve the above object, the present utility model provides an LED driving power supply circuit, comprising:
the power supply input end is used for inputting alternating voltage;
A power supply output terminal;
The input end of the first constant current driving circuit is connected with the power input end, and the first constant current driving circuit is used for converting the alternating voltage into a first driving voltage and outputting the first driving voltage;
The input end of the second constant current driving circuit is connected with the power input end, and the second constant current driving circuit is used for converting the alternating voltage into a second driving voltage and outputting the second driving voltage;
The first input end of the switch circuit is connected with the output end of the first constant current drive circuit, the second input end of the switch circuit is connected with the output end of the second constant current drive circuit, the output end of the switch circuit is connected with the power output end, and the switch circuit is used for controlling the on/off of a passage between the first constant current drive circuit and the power output end and controlling the on/off of a passage between the second constant current drive circuit and the power output end;
The control circuit is characterized in that a power end of the control circuit is connected with the power input end, a detection end of the control circuit is connected with an output end of the first constant current driving circuit, a control end of the control circuit is connected with a controlled end of the switching circuit, and the control circuit is used for controlling the work of the switching circuit according to the output state of the first constant current driving circuit.
In an embodiment, a second detection end of the control circuit is connected with an output end of the second constant current driving circuit;
The LED driving power supply circuit further comprises a battery, wherein the battery is connected with the switch circuit, and the switch circuit is further used for controlling the on/off of a passage between the battery and the power supply output end;
The control circuit is also used for controlling the work of the switch circuit according to the output state of the second constant current drive circuit.
In one embodiment, the first constant current driving circuit includes:
The input end of the first rectifying circuit is connected with the input end of the first constant current driving circuit, and the first rectifying circuit is used for converting the alternating voltage into a first direct voltage;
The input end of the first power factor correction circuit is connected with the output end of the first rectifying circuit;
The input end of the first voltage conversion circuit is connected with the output end of the first power factor correction circuit, the output end of the first voltage conversion circuit is connected with the first input end of the switch circuit, and the first voltage conversion circuit is used for converting the first direct current voltage into the first driving voltage and then outputting the first driving voltage;
The input end of the first detection circuit is connected with the output end of the first voltage conversion circuit, the output end of the first detection circuit is connected with the detection end of the control circuit, and the first detection circuit is used for outputting a detection signal according to the first driving voltage;
The control circuit is also used for controlling the work of the switch circuit according to the detection signal.
In one embodiment, the second constant current driving circuit includes:
The input end of the second rectifying circuit is connected with the input end of the second constant current driving circuit, and the second rectifying circuit is used for converting the alternating voltage into a second direct voltage;
the input end of the second power factor correction circuit is connected with the output end of the second rectifying circuit;
The input end of the second voltage conversion circuit is connected with the output end of the second power factor correction circuit, the output end of the second voltage conversion circuit is connected with the second input end of the switch circuit, and the second voltage conversion circuit is used for converting the second direct current voltage into the second driving voltage and then outputting the second driving voltage.
In an embodiment, the first pfc circuit includes a first control chip, a first switching tube, a first inductor, a first resistor, a first diode, and a first capacitor;
The IN1 pin of the first control chip is connected with a first end of a main winding of the first inductor, the IN2 pin of the first control chip and one end of the first resistor are connected with a negative electrode of the first capacitor, the ZCD pin of the first control chip is connected with a first end of a secondary winding of the first inductor, the OUT pin of the first control chip is connected with a controlled end of the first switch tube, a second end of the main winding of the first inductor and the first end of the first switch tube are connected with a positive electrode of the first diode, a second end of the secondary winding of the first inductor is grounded, a second end of the first switch tube is connected with the other end of the first resistor, and a negative electrode of the first diode is connected with a positive electrode of the first capacitor.
In an embodiment, the second power factor correction circuit includes a second control chip, a second switching tube, a second inductor, a second resistor, a second diode and a second capacitor;
The IN1 pin of the second control chip is connected with the first end of the main winding of the second inductor, the IN2 pin of the second control chip and one end of the second resistor are connected with the negative electrode of the second capacitor, the ZCD pin of the second control chip is connected with the first end of the secondary winding of the second inductor, the OUT pin of the second control chip is connected with the controlled end of the second switch tube, the second end of the main winding of the second inductor and the first end of the second switch tube are connected with the positive electrode of the second diode, the second end of the secondary winding of the second inductor is grounded, the second end of the second switch tube is connected with the other end of the second resistor, and the negative electrode of the second diode is connected with the positive electrode of the second capacitor.
IN an embodiment, the first rectifying circuit includes a third diode, a fourth diode, a fifth diode and a sixth diode, wherein an anode of the third diode and a cathode of the fifth diode are connected with a first end of the power input end, a cathode of the fourth diode and an anode of the sixth diode are connected with a second end of the power input end, a cathode of the third diode and an anode of the fourth diode are connected with an IN1 pin of the first control chip, and an anode of the fifth diode and an anode of the sixth diode are connected with an IN2 pin of the first control chip.
IN an embodiment, the second rectifying circuit comprises a seventh diode, an eighth diode, a ninth diode and a twelfth diode, wherein the positive electrode of the seventh diode and the negative electrode of the ninth diode are connected with the first end of the power input end, the negative electrode of the eighth diode and the positive electrode of the twelfth diode are connected with the second end of the power input end, the negative electrode of the seventh diode and the negative electrode of the eighth diode are connected with an IN1 pin of the second control chip, and the positive electrode of the ninth diode and the positive electrode of the twelfth diode are connected with an IN2 pin of the second control chip.
In one embodiment, the power output end comprises a first power output end and a second power output end, the switch circuit comprises a first output end and a second output end, the first output end of the switch circuit is connected with the first power output end, the second output end of the switch circuit is connected with the second power output end, and the switch circuit is used for controlling on/off of a passage between the first constant current drive circuit and the first power output end, controlling on/off of a passage between the second constant current drive circuit and the second power output end and controlling on/off of a passage between the second constant current drive circuit and the first power output end.
The utility model further provides an LED lamp, which comprises the LED lamp and the LED driving power supply circuit.
The technical scheme of the utility model adopts an LED driving power supply circuit which comprises a first constant current driving circuit, a second constant current driving circuit, a switching circuit and a control circuit. When the first constant current drive circuit works normally, the switching circuit controls the passage between the first constant current drive circuit and the power supply output end to be in a conducting state. The first constant current driving circuit is connected with the power supply output end through a channel, and the channel is in a normal state. The first constant current driving circuit can convert alternating current voltage into first driving voltage to be output, the control circuit detects that the voltage value of the first driving voltage is within a preset range value, the switching circuit controls a passage between the second constant current driving circuit and the power output end to be in an off state, and the power output end outputs the first driving voltage. When the first constant current drive circuit is damaged, the control circuit detects that the voltage value of the first drive voltage is out of a preset voltage range, the switching circuit controls the passage between the first constant current drive circuit and the power output end to be in an off state, controls the passage between the second constant current drive circuit and the power output end to be in an on state, and the second constant current drive circuit can convert the alternating current voltage into the second drive voltage to be output, and the power output end outputs the second drive voltage. Therefore, compared with the prior art, when the output of the first constant current drive circuit is abnormal, the LED driving power supply can be switched to the second constant current drive circuit to output the driving power supply, and the LED driving power supply is suitable for LED driving power supply application scenes with higher requirements on the driving power supply.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an embodiment of an LED driving power circuit according to the present utility model;
fig. 2 is a schematic structural diagram of another embodiment of an LED driving power circuit according to the present utility model;
FIG. 3 is a schematic diagram of an embodiment of an LED driving power circuit according to the present utility model;
Fig. 4 is a schematic structural diagram of another embodiment of an LED driving power circuit according to the present utility model;
Fig. 5 is a schematic structural diagram of an embodiment of an LED lamp according to the present utility model.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear are used in the embodiments of the present utility model) are merely for explaining the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
In the use process of the LED lamp, an LED driving power supply circuit is most easily damaged, and a dead lamp is easily caused. In some LED driving power application scenarios with high requirements for driving power, such as emergency lighting scenarios, existing LED driving power cannot meet the requirements.
The utility model provides an LED driving power circuit 100.
Referring to fig. 1, in an embodiment of the utility model, the LED driving power circuit 100 includes:
the power supply input end is used for inputting alternating voltage;
A power supply output terminal;
The first constant current driving circuit 110, the input end of the first constant current driving circuit 110 is connected with the power input end, and the first constant current driving circuit 110 is used for converting alternating voltage into first driving voltage and outputting the first driving voltage;
the input end of the second constant current driving circuit 120 is connected with the input end of the power supply, and the second constant current driving circuit is used for converting alternating voltage into second driving voltage and outputting the second driving voltage;
The first input end of the switch circuit 130 is connected with the output end of the first constant current driving circuit 110, the second input end of the switch circuit 130 is connected with the output end of the second constant current driving circuit 120, the output end of the switch circuit 130 is connected with the power output end, and the switch circuit 130 is used for controlling the on/off of a passage between the first constant current driving circuit 110 and the power output end and controlling the on/off of a passage between the second constant current driving circuit 120 and the power output end;
The control circuit 140, the power end of the control circuit 140 is connected to the power input end, the detection end of the control circuit 140 is connected to the output end of the first constant current driving circuit 110, the control end of the control circuit 140 is connected to the controlled end of the switch circuit 130, and the control circuit 140 is used for controlling the operation of the switch circuit 130 according to the output state of the first constant current driving circuit 110.
It should be noted that, in the present embodiment, the control circuit 140 may detect the output state of the first constant current driving circuit 110 by detecting whether the voltage value of the first driving voltage is within the preset voltage range, and when the voltage value of the first driving voltage is within the preset voltage range, the first constant current driving circuit 110 is considered to be in the normal output state, and otherwise, the first constant current driving circuit 110 is considered to be in the abnormal output state.
It should be noted that, in this embodiment, the output of the first driving voltage and the output of the second driving voltage are approximately equal, and both the first driving voltage and the second driving voltage may provide driving power for the load connected to the power output terminal.
In this embodiment, when the first constant current driving circuit 110 works normally, the switch circuit 130 controls the path between the first constant current driving circuit 110 and the power output terminal to be in a conductive state. The first constant current driving circuit 110 is in a normal state when the power supply output terminal is in a conducting state. The first constant current driving circuit 110 may convert the ac voltage into a first driving voltage for outputting, the control circuit 140 detects that the voltage value of the first driving voltage is within a preset range, and the switch circuit 130 controls the path between the second constant current driving circuit 120 and the power output terminal to be in an off state, where the power output terminal outputs the first driving voltage. When the first constant current driving circuit 110 is damaged, the control circuit detects that the voltage value of the first driving voltage is out of the preset voltage range, the switch circuit 130 controls the path between the first constant current driving circuit 110 and the power output end to be in an off state, controls the path between the second constant current driving circuit 120 and the power output end to be in an on state, and the second constant current driving circuit can convert the alternating current voltage into the second driving voltage to be output, and the power output end outputs the second driving voltage at the moment. Thus, compared with the prior art, when the output of the first constant current driving circuit 110 is abnormal, the embodiment can switch to the output of the driving power supply by the second constant current driving circuit 120, which is suitable for the application scenario of the LED driving power supply with higher requirement on the driving power supply.
In this embodiment, the control circuit 140 may further include a second detection end, where the second detection end of the control circuit 140 is connected to the output end of the second constant current driving circuit 120, and the control circuit 140 is further configured to control the operation of the switch circuit 130 according to the output state of the second constant current driving circuit 120, for example, when the output of the second constant current driving circuit 120 is abnormal, to switch off the path between the second constant current driving circuit 120 and the power output end, so as to implement protection of the later circuit.
In this embodiment, the switching circuit 130 may include a first electronic switch and a second electronic switch to respectively implement on/off control of a path between the first constant current driving circuit 110 and the power output terminal and on/off control of a path between the second constant current driving circuit 120 and the power output terminal.
In the present utility model, when the first constant current driving circuit 110 works normally, the switch circuit 130 controls the path between the first constant current driving circuit 110 and the power output terminal to be in a conductive state. The first constant current driving circuit 110 is in a normal state when the power supply output terminal is in a conducting state. The first constant current driving circuit 110 may convert the ac voltage into a first driving voltage for outputting, the control circuit 140 detects that the voltage value of the first driving voltage is within a preset range, and the switch circuit 130 controls the path between the second constant current driving circuit 120 and the power output terminal to be in an off state, where the power output terminal outputs the first driving voltage. When the first constant current driving circuit 110 is damaged, the control circuit detects that the voltage value of the first driving voltage is out of the preset voltage range, the switch circuit 130 controls the path between the first constant current driving circuit 110 and the power output end to be in an off state, controls the path between the second constant current driving circuit 120 and the power output end to be in an on state, and the second constant current driving circuit can convert the alternating current voltage into the second driving voltage to be output, and the power output end outputs the second driving voltage at the moment. Thus, compared with the prior art, when the output of the first constant current driving circuit 110 is abnormal, the utility model can switch to the output of the driving power supply by the second constant current driving circuit 120, and is suitable for the application scene of the LED driving power supply with higher requirement on the driving power supply.
Further, referring to fig. 2, in an embodiment of the present utility model, a second detection end of the control circuit 140 is connected to an output end of the second constant current driving circuit 120;
The LED driving power supply circuit 100 further comprises a battery 150, wherein the battery 150 is connected with the switch circuit 130, and the switch circuit 130 is further used for controlling the on/off of a passage between the battery 150 and a power supply output end;
The control circuit 140 is also used to control the operation of the switching circuit 130 according to the output state of the second constant current driving circuit 120.
In this embodiment, when the first constant current driving circuit 110 or the second constant current driving circuit 120 can normally supply the driving power, the switch circuit 130 controls the path between the battery 150 and the power output terminal to be in an off state, which is a constant state. When the first constant current driving circuit 110 and the second constant current driving circuit 120 output abnormally, that is, the control circuit 140 detects that the voltage value of the first driving voltage and the voltage value of the second driving voltage are not within the preset range values, respectively, the switch circuit 130 controls the path between the battery 150 and the power output terminal to be in a conducting state, and the battery 150 provides the driving power. In this way, when the output of the first constant current driving circuit 110 and the output of the second constant current driving circuit 120 are abnormal, the embodiment can switch to the battery 150 to output the driving power, which is suitable for the application scenario of the LED driving power with higher requirement on the driving power. Referring to fig. 3, the battery 150 and the switch circuit 130 may be provided with a third resistor R3 for current limiting protection.
It should be noted that, the battery 150 in this embodiment may be replaced by a charging capacitor, and the first constant current driving circuit 110 or the second constant current driving circuit 120 may be connected to the charging capacitor by the switch circuit 130, so that the charging capacitor may be charged during normal operation. The charging capacitor may be connected to the power output terminal by the switching circuit 130, and the charging capacitor may be discharged when the first constant current driving circuit 110 and the second constant current driving circuit 120 output abnormality, so that the driving power may be output in a short time when the output abnormality occurs.
Further, referring to fig. 2, in an embodiment of the present utility model, the first constant current driving circuit 110 includes:
A first rectifying circuit 111, the first rectifying circuit 111 being configured to convert an ac voltage into a first dc voltage;
a first power factor correction circuit 112, the first power factor correction circuit 112 being connected to the first rectifying circuit 111;
The input end of the first voltage conversion circuit 113 is connected with the output end of the first power factor correction circuit 112, the output end of the first voltage conversion circuit 113 is connected with the first input end of the switch circuit 130, and the first voltage conversion circuit 113 is used for converting the first direct current voltage into the first driving voltage and then outputting the first driving voltage;
The input end of the first detection circuit 114 is connected with the output end of the first voltage conversion circuit 113, the output end of the first detection circuit 114 is connected with the detection end of the control circuit 140, and the first detection circuit 114 is used for outputting a detection signal according to the first driving voltage;
the control circuit 140 is further configured to control the operation of the switch circuit 130 according to the detection signal.
It should be noted that the power factor (Power Factor Correction, PFC) refers to the relation between the active power and the total power, that is, the ratio of the active power divided by the total power. The power factor may measure how effectively power is being utilized, with larger values of the power factor representing higher power utilization. In this embodiment, the power output end may be connected to an LED lamp, and since the LED lamp is generally a nonlinear load, the waveform of the input current is distorted, and includes a large number of harmonic components, thereby reducing the power factor of the circuit. In this embodiment, the first power factor correction circuit 112 is used to improve the power factor of the circuit to reduce the influence of the input harmonic component on the first constant current driving circuit 110.
In this embodiment, the first rectifying circuit 111 can convert the ac voltage into the first dc voltage, and the first power factor correction circuit 112 can improve the power factor of the circuit, so that the first dc voltage can be stably transmitted. The first voltage conversion circuit 113 may convert the first direct current voltage into the first driving voltage and output the first driving voltage. The control circuit 140 may determine whether the output of the first constant current driving circuit 110 is abnormal according to the detection signal output by the first detection circuit 114, and when the output of the first constant current driving circuit 110 is abnormal, the switch circuit 130 controls the path between the first constant current driving circuit 110 and the power output terminal to be in an off state, and controls the path between the second constant current driving circuit 120 and the power output terminal to be in an on state. In this way, the power factor of the circuit can be improved, the influence of the input harmonic component on the output of the first constant current driving circuit 110 can be reduced, and the stability of the first constant current driving circuit 110 can be improved.
In this embodiment, the first voltage conversion circuit 113 may include a first voltage conversion chip U3, where the first voltage conversion chip U3 is configured to implement dc-to-dc voltage conversion, and constant current output control. In this way, the ac voltage can be converted into a first driving voltage output via the first constant current driving circuit 110.
In this embodiment, the first detection circuit 114 may be a current detection IC, a current sensor, or a comparator for detecting the driving power supply by providing a sampling resistor.
Further, referring to fig. 2, in an embodiment of the present utility model, the second constant current driving circuit 120 includes:
The input end of the second rectifying circuit 121 is connected with the input end of the second constant current driving circuit 120, and the second rectifying circuit 121 is used for converting alternating current voltage into second direct current voltage;
the input end of the second power factor correction circuit 122 is connected with the output end of the second rectification circuit 121;
The input end of the second voltage conversion circuit 123 is connected to the output end of the second power factor correction circuit 122, the output end of the second voltage conversion circuit 123 is connected to the second input end of the switch circuit 130, and the second voltage conversion circuit 123 is configured to convert the second dc voltage into the second driving voltage and output the second driving voltage.
In this embodiment, the second rectifying circuit 121 may convert the ac voltage into the second dc voltage, and the second power factor correction circuit 122 may improve the power factor of the circuit, so that the second dc voltage may be stably transmitted. The second voltage conversion circuit 123 may convert the second dc voltage into the second driving voltage and output the second driving voltage. In this embodiment, the second voltage conversion circuit 113 may include a second voltage conversion chip U4, where the second voltage conversion chip U4 is configured to implement dc-to-dc voltage conversion and constant current output control. Thus, the ac voltage can be converted into a second driving voltage output via the second constant current driving circuit 110.
Further, referring to fig. 3, in an embodiment of the utility model, the first pfc circuit 112 includes a first control chip U1, a first switching tube Q1, a first inductor L1, a first resistor R1, a first diode D1 and a first capacitor C1;
the first control chip U1 is connected with a first end of a main winding of a first inductor L1 through an IN1 pin, a first end of a first resistor R1 is connected with a negative electrode of a first capacitor C1 through an IN2 pin of the first control chip U1, a ZCD pin of the first control chip U1 is connected with a first end of a secondary winding of the first inductor L1, an OUT pin of the first control chip U1 is connected with a controlled end of a first switch tube Q1, a second end of the main winding of the first inductor L1 and a first end of the first switch tube Q1 are connected with an anode of a first diode D1, a second end of the secondary winding of the first inductor L1 is grounded, a second end of the first switch tube Q1 is connected with the other end of the first resistor R1, and a negative electrode of the first diode D1 is connected with an anode of the first capacitor C1.
In this embodiment, the first control chip U1 may be a PFC chip, where the PFC chip is configured to measure an input current and an output voltage, and generate a control signal to adjust a conduction time of the switching tube, so as to implement power factor correction. For example, in the initial stage, the first switching tube Q1 is turned on, the circuit forms a closed loop, the current flows through the main winding of the first inductor L1, the main winding of the first inductor L1 starts to store energy, and the current gradually increases. When the inductance current reaches a peak value, the first control chip U1 can detect that the voltage of the secondary winding of the first inductance L1 reaches the peak value through the ZCD pin, and at the moment, a control signal is sent to control the first switching tube Q1 to be disconnected, and the energy stored by the first inductance L1 is released to charge the first capacitor. When the first switching transistor Q1 is turned off, the current in the first inductor L1 starts to decrease. Until the inductance current of the first inductor L1 drops to zero, the voltage detected by the ZCD pin also drops to zero, the first switching tube Q1 is controlled to be conducted again, and the process is repeated. It should be noted that, the on time of the switch tube can be adjusted according to a specific circuit, and the power factor correction process of the circuit is not limited. In this way, the present embodiment can make the current waveform approximate to a sine wave by controlling the on time of the first switching tube Q1, so as to reduce the harmonic content and improve the power factor. When the current waveform is closer to a sine wave, the power factor is closer to 1, so that the correction of the power factor is realized.
Further, referring to fig. 3, in an embodiment of the utility model, the second pfc circuit 122 includes a second control chip U2, a second switching tube Q2, a second inductor L2, a second resistor R2, a second diode D2 and a second capacitor C2;
The IN1 pin of the second control chip U2 is connected with the first end of the main winding of the second inductor L2, the IN2 pin of the second control chip U2 and one end of the second resistor R2 are connected with the negative electrode of the second capacitor C2, the ZCD pin of the second control chip U2 is connected with the first end of the secondary winding of the second inductor L2, the OUT pin of the second control chip U2 is connected with the controlled end of the second switch tube Q2, the second end of the main winding of the second inductor L2 and the first end of the second switch tube Q2 are connected with the positive electrode of the second diode D2, the second end of the secondary winding of the second inductor L2 is grounded, the second end of the second switch tube Q2 is connected with the other end of the second resistor R2, and the negative electrode of the second diode D2 is connected with the positive electrode of the second capacitor C2.
In this embodiment, the second control chip U2 may be a PFC chip, where the PFC chip is configured to measure an input current and an output voltage, and generate a control signal to adjust a conduction time of the switching tube, so as to implement power factor correction. For example, in the initial stage, the second switching tube Q2 is turned on, the circuit forms a closed loop, the current flows through the main winding of the second inductor L2, the main winding of the second inductor L2 starts to store energy, and the current gradually increases. When the inductance current reaches the peak value, the second control chip U2 can detect that the voltage of the secondary winding of the second inductance L2 reaches the peak value through the ZCD pin, and at the moment, a control signal is sent to control the second switching tube Q2 to be disconnected, and the energy stored by the second inductance L2 is released to charge the second capacitor. When the second switching transistor Q2 is turned off, the current in the second inductor L2 starts to drop. Until the inductance current of the second inductor L2 drops to zero, the voltage detected by the ZCD pin also drops to zero, the second switching tube Q2 is controlled to be conducted again, and the process is repeated. It should be noted that, the on time of the switch tube can be adjusted according to a specific circuit, and the power factor correction process of the circuit is not limited. In this way, the embodiment can make the current waveform approximate to a sine wave by controlling the on time of the second switching tube Q2, so as to reduce the harmonic content and improve the power factor. When the current waveform is closer to a sine wave, the power factor is closer to 1, so that the correction of the power factor is realized.
Further, referring to fig. 3, IN an embodiment of the utility model, the first rectifying circuit 111 includes a third diode D3, a fourth diode D4, and a fifth diode D5 connected to the sixth diode D6, wherein an anode of the third diode D3 and a cathode of the fifth diode D5 are connected to a first end of the power input terminal, an anode of the fourth diode D4 and an anode of the sixth diode D6 are connected to a second end of the power input terminal, an anode of the third diode D3 and an anode of the fourth diode D4 are connected to an IN1 pin of the first control chip U1, and an anode of the fifth diode D5 and an anode of the sixth diode D6 are connected to an IN2 pin of the first control chip U1.
In this embodiment, the ac voltage can be converted into the first dc voltage by the third diode D3, the fourth diode D4, the fifth diode D5 and the sixth diode D6, which has high conversion efficiency and small ripple.
Further, referring to fig. 3, IN an embodiment of the utility model, the second rectifying circuit 121 includes a seventh diode D7, an eighth diode D8, and a ninth diode D9 connected to the tenth diode D10, wherein the anode of the seventh diode D7 and the cathode of the ninth diode D9 are connected to the first end of the power input terminal, the cathode of the eighth diode D8 and the anode of the twelfth diode D10 are connected to the second end of the power input terminal, the cathode of the seventh diode D7 and the cathode of the eighth diode D8 are connected to the IN1 pin of the second control chip U2, and the anode of the ninth diode D9 and the anode of the twelfth diode D10 are connected to the IN2 pin of the second control chip U2.
In this embodiment, the ac voltage can be converted into the second dc voltage by the seventh diode D7, the eighth diode D8, the ninth diode D9 and the twelfth diode D10, which has high conversion efficiency and small ripple.
Further, referring to fig. 4, in an embodiment of the present utility model, the power output terminal includes a first power output terminal and a second power output terminal, the switch circuit 130 includes a first output terminal and a second output terminal, the first output terminal of the switch circuit 130 is connected to the first power output terminal, the second output terminal of the switch circuit 130 is connected to the second power output terminal, the switch circuit 130 is used for controlling on/off of a path between the first constant current driving circuit 110 and the first power output terminal, controlling on/off of a path between the second constant current driving circuit 120 and the second power output terminal, and controlling on/off of a path between the second constant current driving circuit 120 and the first power output terminal 110.
In this embodiment, when two LED lamps need to be connected, the path between the second constant current driving circuit 120 and the first power output terminal 110 can be controlled to be kept off, the path between the first constant current driving circuit 110 and the first power output terminal is controlled to be in a conducting state, and the path between the second constant current driving circuit 120 and the second power output terminal is controlled to be in a conducting state, at this time, the first constant current driving circuit 110 can provide a driving power supply for the first LED lamp, and the second constant current driving circuit 120 can provide a driving power supply for the second LED lamp. Thus, the embodiment maximally utilizes the double constant current driving circuits, and enhances the practicability.
Referring to fig. 5, the present utility model further provides an LED lamp, which includes an LED lamp 200 and an LED driving power circuit 100, and the specific structure of the LED driving power circuit 100 refers to the above embodiment, and since the LED lamp adopts all the technical solutions of all the embodiments, the LED lamp has at least all the beneficial effects brought by the technical solutions of the embodiments, which are not described in detail herein.
The foregoing description is only exemplary embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the present utility model.
Claims (10)
1. An LED driving power supply circuit, comprising:
the power supply input end is used for inputting alternating voltage;
A power supply output terminal;
The input end of the first constant current driving circuit is connected with the power input end, and the first constant current driving circuit is used for converting the alternating voltage into a first driving voltage and outputting the first driving voltage;
The input end of the second constant current driving circuit is connected with the power input end, and the second constant current driving circuit is used for converting the alternating voltage into a second driving voltage and outputting the second driving voltage;
The first input end of the switch circuit is connected with the output end of the first constant current drive circuit, the second input end of the switch circuit is connected with the output end of the second constant current drive circuit, the output end of the switch circuit is connected with the power output end, and the switch circuit is used for controlling the on/off of a passage between the first constant current drive circuit and the power output end and controlling the on/off of a passage between the second constant current drive circuit and the power output end;
The control circuit is characterized in that a power end of the control circuit is connected with the power input end, a detection end of the control circuit is connected with an output end of the first constant current driving circuit, a control end of the control circuit is connected with a controlled end of the switching circuit, and the control circuit is used for controlling the work of the switching circuit according to the output state of the first constant current driving circuit.
2. The LED driving power supply circuit according to claim 1, wherein the second detection terminal of the control circuit is connected to the output terminal of the second constant current driving circuit;
The LED driving power supply circuit further comprises a battery, wherein the battery is connected with the switch circuit, and the switch circuit is further used for controlling the on/off of a passage between the battery and the power supply output end;
The control circuit is also used for controlling the work of the switch circuit according to the output state of the second constant current drive circuit.
3. The LED driving power supply circuit according to claim 1, wherein the first constant current driving circuit includes:
The input end of the first rectifying circuit is connected with the input end of the first constant current driving circuit, and the first rectifying circuit is used for converting the alternating voltage into a first direct voltage;
The input end of the first power factor correction circuit is connected with the output end of the first rectifying circuit;
The input end of the first voltage conversion circuit is connected with the output end of the first power factor correction circuit, the output end of the first voltage conversion circuit is connected with the first input end of the switch circuit, and the first voltage conversion circuit is used for converting the first direct current voltage into the first driving voltage and then outputting the first driving voltage;
The input end of the first detection circuit is connected with the output end of the first voltage conversion circuit, the output end of the first detection circuit is connected with the detection end of the control circuit, and the first detection circuit is used for outputting a detection signal according to the first driving voltage;
The control circuit is also used for controlling the work of the switch circuit according to the detection signal.
4. The LED driving power supply circuit according to claim 1, wherein the second constant current driving circuit includes:
The input end of the second rectifying circuit is connected with the input end of the second constant current driving circuit, and the second rectifying circuit is used for converting the alternating voltage into a second direct voltage;
the input end of the second power factor correction circuit is connected with the output end of the second rectifying circuit;
The input end of the second voltage conversion circuit is connected with the output end of the second power factor correction circuit, the output end of the second voltage conversion circuit is connected with the second input end of the switch circuit, and the second voltage conversion circuit is used for converting the second direct current voltage into the second driving voltage and then outputting the second driving voltage.
5. The LED driving power supply circuit of claim 3, wherein the first power factor correction circuit comprises a first control chip, a first switching tube, a first inductor, a first resistor, a first diode, and a first capacitor;
The IN1 pin of the first control chip is connected with a first end of a main winding of the first inductor, the IN2 pin of the first control chip and one end of the first resistor are connected with a negative electrode of the first capacitor, the ZCD pin of the first control chip is connected with a first end of a secondary winding of the first inductor, the OUT pin of the first control chip is connected with a controlled end of the first switch tube, a second end of the main winding of the first inductor and the first end of the first switch tube are connected with a positive electrode of the first diode, a second end of the secondary winding of the first inductor is grounded, a second end of the first switch tube is connected with the other end of the first resistor, and a negative electrode of the first diode is connected with a positive electrode of the first capacitor.
6. The LED driving power circuit of claim 4, wherein the second power factor correction circuit comprises a second control chip, a second switching tube, a second inductor, a second resistor, a second diode, and a second capacitor;
The IN1 pin of the second control chip is connected with the first end of the main winding of the second inductor, the IN2 pin of the second control chip and one end of the second resistor are connected with the negative electrode of the second capacitor, the ZCD pin of the second control chip is connected with the first end of the secondary winding of the second inductor, the OUT pin of the second control chip is connected with the controlled end of the second switch tube, the second end of the main winding of the second inductor and the first end of the second switch tube are connected with the positive electrode of the second diode, the second end of the secondary winding of the second inductor is grounded, the second end of the second switch tube is connected with the other end of the second resistor, and the negative electrode of the second diode is connected with the positive electrode of the second capacitor.
7. The LED driving power supply circuit according to claim 5, wherein the first rectifying circuit comprises a third diode, a fourth diode, a fifth diode and a sixth diode, wherein an anode of the third diode and a cathode of the fifth diode are connected with a first end of the power supply input end, an anode of the fourth diode and an anode of the sixth diode are connected with a second end of the power supply input end, an anode of the third diode and an anode of the fourth diode are connected with an IN1 pin of the first control chip, and an anode of the fifth diode and an anode of the sixth diode are connected with an IN2 pin of the first control chip.
8. The LED driving power supply circuit according to claim 6, wherein the second rectifying circuit comprises a seventh diode, an eighth diode, a ninth diode and a twelfth diode, wherein an anode of the seventh diode and a cathode of the ninth diode are connected with a first end of the power supply input end, an anode of the eighth diode and an anode of the twelfth diode are connected with a second end of the power supply input end, an anode of the seventh diode and an anode of the eighth diode are connected with an IN1 pin of the second control chip, and an anode of the ninth diode and an anode of the twelfth diode are connected with an IN2 pin of the second control chip.
9. The LED driving power supply circuit of claim 1, wherein the power output terminal comprises a first power output terminal and a second power output terminal, the switching circuit comprises a first output terminal and a second output terminal, the first output terminal of the switching circuit is connected to the first power output terminal, the second output terminal of the switching circuit is connected to the second power output terminal, the switching circuit is used for controlling on/off of a path between the first constant current driving circuit and the first power output terminal, controlling on/off of a path between the second constant current driving circuit and the second power output terminal, and controlling on/off of a path between the second constant current driving circuit and the first power output terminal.
10. An LED luminaire characterized in that it comprises an LED lamp and an LED driving power supply circuit as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421130515.9U CN222621233U (en) | 2024-05-22 | 2024-05-22 | LED driving power supply circuit and LED lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421130515.9U CN222621233U (en) | 2024-05-22 | 2024-05-22 | LED driving power supply circuit and LED lamp |
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| CN222621233U true CN222621233U (en) | 2025-03-14 |
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| CN (1) | CN222621233U (en) |
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