Driving circuit capable of switching power

Abstract

The utility model provides a driving circuit capable of switching power. The driving circuit comprises a first driving unit, a second driving unit, a gating unit, a first light source and a second light source, the power supply end of the first driving unit, the power supply end of the second driving unit and the power supply end of the gating unit are used for being connected with a power supply; the first output end of the gating unit is connected with the enabling end of the first driving unit; the second output end of the gating unit is connected with the enabling end of the second driving unit; the clock end of the gating unit is used for detecting a power switch signal and controlling the enabling end of the first driving unit and the enabling end of the second driving unit to be closed or started according to the power switch signal; the output end of the first driving unit is connected with the first light source; the output end of the second driving unit is connected with the second light source; the output power of the first driving unit is different from that of the second driving unit. Switching of two groups of driving units with different output power is realized, so that the circuit complexity is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply drive circuits, in particular to a drive circuit with switchable power. Background Art

[0002] Most of the existing LED lamp board drive circuits are single drives corresponding to a group of LED lamp beads. However, for the same product with different power emission requirements, and different powers corresponding to different LED lamp beads, such as downlight-integrated lamps. For the above design requirements, most current solutions adopt adjusting the duty cycle of the MCU chip to control the PWM (Pulse Width Modulation) of the main circuit chip, so as to achieve different power outputs. However, due to different LED lamp beads corresponding to different powers, a switching MOS transistor needs to be introduced to achieve different power switching, which increases the circuit complexity and results in low power supply efficiency. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is: to provide a drive circuit with switchable power, which reduces the circuit complexity while realizing the power switching of the drive circuit.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is:

[0005] A drive circuit with switchable power includes a first drive unit, a second drive unit, a gating unit, a first light source, and a second light source; the power supply terminals of the first drive unit, the second drive unit, and the gating unit are used to connect to a power supply; the first output terminal of the gating unit is connected to the enable terminal of the first drive unit; the second output terminal of the gating unit is connected to the enable terminal of the second drive unit; the clock terminal of the gating unit is used to detect a power switch signal and control the closing or starting of the enable terminals of the first drive unit and the second drive unit according to the power switch signal; the output terminal of the first drive unit is connected to the first light source; the output terminal of the second drive unit is connected to the second light source; the output powers of the first drive unit and the second drive unit are different.

[0006] Further, the first drive unit includes a drive chip and a transformer; one end of the primary of the transformer and the power supply terminal of the drive chip are used to connect to a power supply; the other end of the primary of the transformer is connected to the output terminal of the drive chip; the secondary of the transformer is connected to the first light source.

[0007] Further, the first driving unit further includes a first resistor, a second resistor, a first diode, and a first capacitor; one end of the secondary of the transformer is respectively connected to one end of the first resistor, one end of the second resistor, and the positive electrode of the first diode; the other end of the first resistor is respectively connected to the other end of the second resistor and one end of the first capacitor; the negative electrode of the first diode is respectively connected to the other end of the first capacitor and the positive electrode of the first light source; the other end of the secondary of the transformer is connected to the negative electrode of the first light source.

[0008] Further, the first driving unit further includes an electrolytic capacitor and a third resistor; the positive electrode of the electrolytic capacitor is respectively connected to one end of the third resistor, the negative electrode of the first diode, and the positive electrode of the first light source; the negative electrode of the electrolytic capacitor is respectively connected to the other end of the third resistor, the other end of the secondary of the transformer, and the negative electrode of the first light source.

[0009] Further, the first driving unit further includes a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second diode, and a second capacitor; one end of the fourth resistor is respectively connected to one end of the fifth resistor, one end of the second capacitor, and a power supply; the other end of the fourth resistor is respectively connected to the other end of the fifth resistor, the other end of the second capacitor, one end of the sixth resistor, and one end of the seventh resistor; the other end of the sixth resistor is respectively connected to the other end of the seventh resistor and the negative electrode of the second diode; the positive electrode of the second diode is respectively connected to the other end of the primary of the transformer and the output end of the driving chip.

[0010] Further, a rectifier bridge and a filtering component are further included; the input end of the rectifier bridge is used to be connected to the commercial power; the output end of the rectifier bridge is connected to the input end of the filtering component; the output end of the filtering component is respectively connected to the power supply end of the first driving unit, the power supply end of the second driving unit, and the power supply end of the gating unit.

[0011] Further, a varistor is further included; the varistor is connected to the input end of the rectifier bridge.

[0012] Further, the second driving unit has the same circuit structure as the first driving unit.

[0013] Further, the first light source and the second light source are different light sources.

[0014] Further, the first light source is a spotlight source; the second light source is a downlight source.

[0015] The beneficial effects of the present utility model are as follows: By providing a gating unit and two driving units with different output powers, and connecting the two output terminals of the gating unit to the enable terminals of the first driving unit and the second driving unit respectively, when the clock terminal of the gating unit detects a power switch signal, it can control the closing or starting of the enable terminals of the first driving unit and the second driving unit according to the power switch signal, realizing the switching of two driving units with different output powers, without the need to introduce a switching MOS transistor or use a PWM signal for power control, thereby reducing the circuit complexity. Description of the Drawings

[0016] Figure 1 It is the circuit diagram of a driving circuit with switchable power in an embodiment of the present utility model;

[0017] Figure 2 It is the circuit diagram of the filtering component in a driving circuit with switchable power in an embodiment of the present utility model;

[0018] Figure 3 It is the circuit diagram of the first driving unit in a driving circuit with switchable power in an embodiment of the present utility model;

[0019] Label Description:

[0020] 1. First driving unit; 2. Second driving unit; 3. Gating unit; 4. First light source; 5. Second light source;

[0021] IC1, driving chip; T1, transformer; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; D1, first diode; D2, second diode; C1, first capacitor; C2, second capacitor; E1, electrolytic capacitor; DB1, rectifier bridge; RV1, varistor. Detailed Embodiment

[0022] To describe in detail the technical content, achieved objectives and effects of the present utility model, the following is described in conjunction with the embodiments and with reference to the drawings.

[0023] Please refer to Figure 1, A drive circuit with switchable power, comprising a first drive unit, a second drive unit, a gating unit, a first light source, and a second light source; the power supply terminals of the first drive unit, the second drive unit, and the gating unit are used to connect to a power supply; the first output terminal of the gating unit is connected to the enable terminal of the first drive unit; the second output terminal of the gating unit is connected to the enable terminal of the second drive unit; the clock terminal of the gating unit is used to detect a power switch signal and control the turn-off or turn-on of the enable terminals of the first drive unit and the second drive unit according to the power switch signal; the output terminal of the first drive unit is connected to the first light source; the output terminal of the second drive unit is connected to the second light source; the output powers of the first drive unit and the second drive unit are different.

[0024] As can be seen from the above description, the beneficial effect of the present utility model is that: by setting a gating unit and two drive units with different output powers, and connecting the two output terminals of the gating unit to the enable terminal of the first drive unit and the enable terminal of the second drive unit respectively, when the clock terminal of the gating unit detects a power switch signal, it can control the turn-off or turn-on of the enable terminals of the first drive unit and the second drive unit according to the power switch signal, realizing the switching of two drive units with different output powers, without the need to introduce a switching MOS transistor or use a PWM signal method for power control, thereby reducing the circuit complexity.

[0025] Further, the first drive unit includes a drive chip and a transformer; one end of the primary pole of the transformer and the power supply terminal of the drive chip are used to connect to a power supply; the other end of the primary pole of the transformer is connected to the output terminal of the drive chip; the secondary pole of the transformer is connected to the first light source.

[0026] As can be seen from the above description, by setting a drive unit composed of a drive chip and a transformer, after the output power is adjusted by the drive chip, the transformer converts the power into the voltage and current required by the first light source, enabling the first light source to work stably.

[0027] Further, the first drive unit further includes a first resistor, a second resistor, a first diode, and a first capacitor; one end of the secondary pole of the transformer is respectively connected to one end of the first resistor, one end of the second resistor, and the positive electrode of the first diode; the other end of the first resistor is respectively connected to the other end of the second resistor and one end of the first capacitor; the negative electrode of the first diode is respectively connected to the other end of the first capacitor and the positive electrode of the first light source; the other end of the secondary pole of the transformer is connected to the negative electrode of the first light source.

[0028] As described above, a spike absorption unit composed of a first resistor, a second resistor, a first diode, and a first capacitor can absorb the spike electrical signals generated by the secondary of the transformer, thereby providing stable power supply for the first light source.

[0029] Further, the first driving unit further includes an electrolytic capacitor and a third resistor; the positive electrode of the electrolytic capacitor is respectively connected to one end of the third resistor, the negative electrode of the first diode, and the positive electrode of the first light source; the negative electrode of the electrolytic capacitor is respectively connected to the other end of the third resistor, the other end of the transformer secondary, and the negative electrode of the first light source.

[0030] As described above, by arranging an electrolytic capacitor and a third resistor at the secondary output end of the transformer, the functions of storing electrical energy and acting as a dummy load are achieved, making the circuit work more stably.

[0031] Further, the first driving unit further includes a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second diode, and a second capacitor; one end of the fourth resistor is respectively connected to one end of the fifth resistor, one end of the second capacitor, and the power supply; the other end of the fourth resistor is respectively connected to the other end of the fifth resistor, the other end of the second capacitor, one end of the sixth resistor, and one end of the seventh resistor; the other end of the sixth resistor is respectively connected to the other end of the seventh resistor and the negative electrode of the second diode; the positive electrode of the second diode is respectively connected to the other end of the primary of the transformer and the output end of the driving chip.

[0032] As described above, by arranging a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second diode, and a second capacitor to form a capacitive-resistive spike absorption circuit, the function of absorbing the spike electrical signals generated by the power supply input is achieved, making the circuit power supply more stable.

[0033] Further, it further includes a rectifier bridge and a filtering component; the input end of the rectifier bridge is used to connect to the mains; the output end of the rectifier bridge is connected to the input end of the filtering component; the output end of the filtering component is respectively connected to the power supply end of the first driving unit, the power supply end of the second driving unit, and the power supply end of the gating unit.

[0034] As described above, by arranging a rectifier bridge and a filtering component, the input mains can be converted into stable direct current to supply power to the subsequent modules.

[0035] Further, it further includes a varistor; the varistor is connected to the input end of the rectifier bridge.

[0036] As described above, by arranging a varistor at the input end of the rectifier bridge, the voltage change at the input end can be detected, playing a protective role for the circuit.

[0037] Further, the circuit structures of the second driving unit and the first driving unit are the same.

[0038] As can be seen from the above description, by adopting the same circuit structure for the second driving unit and the first driving unit, different power outputs can be achieved by changing the parameters of electronic components, simplifying the circuit design.

[0039] Further, the first light source and the second light source are different light sources.

[0040] As can be seen from the above description, since the first light source and the second light source are different light sources, different lighting effects can be achieved.

[0041] Further, the first light source is a spotlight source; the second light source is a downlight source.

[0042] As can be seen from the above description, by adopting a spotlight source for the first light source and a downlight source for the second light source, an integrated downlight and spotlight fixture is realized.

[0043] The drive circuit with switchable power provided by the present utility model can be applied to lighting scenarios with multiple power requirements, which will be described below through specific embodiments:

[0044] Embodiment 1

[0045] Please refer to Figure 1 , a drive circuit with switchable power, comprising a first driving unit 1, a second driving unit 2, a gating unit 3, a first light source 4 and a second light source 5; the power supply terminals (HV) of the first driving unit 1, the power supply terminal (HV) of the second driving unit 2 and the power supply terminal (HV) of the gating unit 3 are used to connect to a power supply (VBUS); the first output terminal (L1) of the gating unit 3 is connected to the enable terminal (ROVP) of the first driving unit 1; the second output terminal (L2) of the gating unit 3 is connected to the enable terminal (ROVP) of the second driving unit 2; the clock terminal (CLK) of the gating unit 3 is used to detect a power switch signal and control the turn-off or start of the enable terminals of the first driving unit 1 and the second driving unit 2 according to the power switch signal; the output terminal of the first driving unit 1 is connected to the first light source 4; the output terminal of the second driving unit 2 is connected to the second light source 5; the output powers of the first driving unit 1 and the second driving unit 2 are different.

[0046] Please refer to Figure 2 , a rectifier bridge DB1 and a filtering component are further provided; the input terminal of the rectifier bridge DB1 is used to connect to the commercial power; the output terminal of the rectifier bridge DB1 is connected to the input terminal of the filtering component; the output terminal of the filtering component is respectively connected to the power supply terminal of the first driving unit 1, the power supply terminal of the second driving unit 2 and the power supply terminal of the gating unit 3; as Figure 2As shown, the filtering component includes an inductor L1, a resistor R9, capacitors E2 and E3; among them, a varistor RV1 and a fuse resistor F1 are also provided at the input end; the varistor RV1 is connected to the input end of the rectifier bridge DB1; the clock terminal (CLK) of the gating unit 3 is connected to the live wire and is provided at the rear end of the fuse resistor F1.

[0047] Please refer to Figure 3 , the first driving unit 1 includes a driving chip IC1, a transformer T1, a first resistor R1, a second resistor R2, a first diode D1, a first capacitor C1, an electrolytic capacitor E1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second diode D2 and a second capacitor C2;

[0048] Among them, one end of the primary pole of the transformer T1 and the power supply terminal of the driving chip IC1 are used to be connected to the power supply; the other end of the primary pole of the transformer T1 is connected to the output terminal of the driving chip IC1; the secondary pole of the transformer T1 is connected to the first light source 4, and at the same time one end of the secondary pole of the transformer T1 is respectively connected to one end of the first resistor R1, one end of the second resistor R2 and the positive pole of the first diode D1; the other end of the first resistor R1 is respectively connected to the other end of the second resistor R2 and one end of the first capacitor C1; the negative pole of the first diode D1 is respectively connected to the other end of the first capacitor C1 and the positive pole of the first light source 4; the other end of the secondary pole of the transformer T1 is connected to the negative pole of the first light source 4; the first resistor R1, the second resistor R2, the first diode D1 and the first capacitor C1 form a spike absorption unit, which can absorb the spike electrical signals generated by the secondary of the transformer T1.

[0049] The positive pole of the electrolytic capacitor E1 is respectively connected to one end of the third resistor R3, the negative pole of the first diode D1 and the positive pole of the first light source 4; the negative pole of the electrolytic capacitor E1 is respectively connected to the other end of the third resistor R3, the other end of the secondary pole of the transformer T1 and the negative pole of the first light source 4; the electrolytic capacitor E1 and the third resistor R3 play the roles of storing electrical energy and a fake load.

[0050] One end of the fourth resistor R4 is respectively connected to one end of the fifth resistor R5, one end of the second capacitor C2 and the power supply; the other end of the fourth resistor R4 is respectively connected to the other end of the fifth resistor R5, the other end of the second capacitor C2, one end of the sixth resistor R6 and one end of the seventh resistor R7; the other end of the sixth resistor R6 is respectively connected to the other end of the seventh resistor R7 and the negative pole of the second diode D2; the positive pole of the second diode D2 is respectively connected to the other end of the primary pole of the transformer T1 and the output terminal of the driving chip IC1; the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the second diode D2 and the second capacitor C2 form a capacitor-resistor spike absorption circuit, which plays the role of absorbing the spike electrical signals generated by the power supply input.

[0051] In an optional embodiment, the second driving unit 2 has the same circuit structure as the first driving unit 1, and different power outputs are generated between the second driving unit 2 and the first driving unit 1 by changing the parameters of electronic components; for example, the output power of the first driving unit 1 is 7W, and the output power of the second driving unit 2 is 13W. At the same time, the first light source 4 and the second light source 5 are different light sources; for example, the first light source 4 is a spotlight source, and the second light source 5 is a downlight source.

[0052] The working principle of the above-mentioned drive circuit with switchable power is as follows:

[0053] The power-on state is judged by detecting the pulse signal waveform of the input power supply at the clock input end of the gating unit 3; when the external switch is closed, the MOS transistor at the second output end (L2) inside the gating unit 3 is turned on, and at this time the second output end is connected to the ground (GND); since the second output end is connected to the enable end (ROVP) of the second driving unit 2, that is, the enable end of the second driving unit 2 is also grounded, and at this time the second driving unit 2 has no output and cannot supply power to the second light source 5. On the contrary, the MOS transistor at the first output end (L1) inside the gating unit 3 is cut off, and the first output end is grounded; that is, the first driving unit 1 works normally and supplies power to the first light source 4, and at this time the total power output by the LED power supply is 7W.

[0054] If power is reapplied within a preset time after power-off, for example, if power is reapplied for the second time within 6 seconds after the switch is powered off; then at this time, the MOS transistor at the first output end inside the gating unit 3 is turned on and stops working, and the first light source 4 goes out. On the contrary, the MOS transistor at the second output end inside the gating unit 3 is cut off, that is, the second driving unit 2 works normally and supplies power to the second light source 5, and at this time the total power output by the LED power supply is 13W.

[0055] If power is reapplied within the preset time after power-off, for example, if power is reapplied for the third time within 6 seconds after the switch is powered off, the MOS transistors at both the first output end and the second output end inside the gating unit 3 are cut off; that is, both the first driving unit 1 and the second driving unit 2 work normally, and at this time the total power output by the LED power supply is 7 + 13 = 20W.

[0056] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A drive circuit with switchable power, characterized in that, It includes a first driving unit, a second driving unit, a gating unit, a first light source, and a second light source; The power supply terminals of the first driving unit, the second driving unit, and the gating unit are used to connect to a power supply; The first output terminal of the gating unit is connected to the enable terminal of the first driving unit; The second output terminal of the gating unit is connected to the enable terminal of the second driving unit; The clock terminal of the gating unit is used to detect a power switch signal and control the turn-off or turn-on of the enable terminals of the first driving unit and the second driving unit according to the power switch signal; The output terminal of the first driving unit is connected to the first light source; The output terminal of the second driving unit is connected to the second light source; The output powers of the first driving unit and the second driving unit are different.

2. The drive circuit with switchable power according to claim 1, wherein The first driving unit includes a driving chip and a transformer; One end of the primary of the transformer and the power supply terminal of the driving chip are used to connect to a power supply; The other end of the primary of the transformer is connected to the output terminal of the driving chip; The secondary of the transformer is connected to the first light source.

3. The driving circuit with switchable power according to claim 2, wherein, The first driving unit further includes a first resistor, a second resistor, a first diode, and a first capacitor; One end of the secondary of the transformer is respectively connected to one end of the first resistor, one end of the second resistor, and the positive electrode of the first diode; The other end of the first resistor is respectively connected to the other end of the second resistor and one end of the first capacitor; The negative electrode of the first diode is respectively connected to the other end of the first capacitor and the positive electrode of the first light source; The other end of the secondary of the transformer is connected to the negative electrode of the first light source.

4. The drive circuit with switchable power according to claim 3, characterized in that, The first driving unit further includes an electrolytic capacitor and a third resistor; The positive electrode of the electrolytic capacitor is respectively connected to one end of the third resistor, the negative electrode of the first diode, and the positive electrode of the first light source; The negative electrode of the electrolytic capacitor is respectively connected to the other end of the third resistor, the other end of the secondary of the transformer, and the negative electrode of the first light source.

5. The drive circuit with switchable power according to claim 2, characterized in that, The first driving unit further includes a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second diode, and a second capacitor; One end of the fourth resistor is respectively connected to one end of the fifth resistor, one end of the second capacitor, and a power supply; The other end of the fourth resistor is respectively connected to the other end of the fifth resistor, the other end of the second capacitor, one end of the sixth resistor, and one end of the seventh resistor; The other end of the sixth resistor is respectively connected to the other end of the seventh resistor and the negative electrode of the second diode; The positive electrode of the second diode is respectively connected to the other end of the primary of the transformer and the output terminal of the driving chip.

6. The drive circuit with switchable power according to claim 1, wherein It further includes a rectifier bridge and a filtering component; The input terminal of the rectifier bridge is used to connect to the mains; The output terminal of the rectifier bridge is connected to the input terminal of the filtering component; The output terminal of the filtering component is respectively connected to the power supply terminals of the first driving unit, the second driving unit, and the gating unit.

7. The drive circuit with switchable power according to claim 6, wherein It further includes a varistor; The varistor is connected to the input terminal of the rectifier bridge.

8. A drive circuit with switchable power according to any one of claims 1-5, characterized in that, The circuit structure of the second driving unit is the same as that of the first driving unit.

9. The drive circuit with switchable power according to claim 1, characterized in that, The first light source and the second light source are different light sources.

10. A drive circuit with switchable power according to claim 9, characterized in that, The first light source is a spotlight source; the second light source is a downlight source.

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