Small night lamp driving circuit and device

Abstract

The utility model discloses a small night lamp driving circuit and device. The small night lamp driving circuit comprises a filtering rectification circuit, a driving control circuit and a small night lamp module. The input end of the filtering and rectifying circuit is used for being connected with alternating current, the output end of the filtering and rectifying circuit is connected with the input end of the driving control circuit and the power supply end of the small night lamp module, and the first output end of the driving control circuit is connected with the control end of the small night lamp module. The second output end of the driving control circuit is used for being connected with a main lighting module. According to the utility model, the small night lamp driving circuit is modularized and then is directly installed on the existing LED driving circuit, so that the switching between the small night lamp function and the main illumination function is satisfied, the existing LED driving circuit does not need to be replaced and adjusted, and the illumination cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting equipment, and in particular to a night light driving circuit and a device. Background Art

[0002] Currently, most of the LED (Light-Emitting Diode) lamps such as ceiling lamps on the market do not have the function of night lights. However, when LED lamps are used in bedrooms and other places, users often have the need for night lights. In this regard, users can only replace LED lamps with night lights to meet both the night light function and the main lighting function. However, this method has high lighting costs and a cumbersome replacement process. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a night light driving circuit and device, which can directly install the night light driving circuit on the existing LED driving circuit after modularization, and can reduce the lighting cost by eliminating the need to replace and adjust the existing LED driving circuit while satisfying the switching between the night light function and the main lighting function.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A night light driving circuit, comprising a filtering and rectifying circuit, a driving control circuit and a night light module;

[0006] The input end of the filter and rectifier circuit is used to connect to alternating current, the output end of the filter and rectifier circuit is respectively connected to the input end of the drive control circuit and the power supply end of the night light module, the first output end of the drive control circuit is connected to the control end of the night light module, and the second output end of the drive control circuit is used to connect to the main lighting module.

[0007] Further, a protection circuit is included;

[0008] The input end of the protection circuit is used to connect to the alternating current, and the output end of the protection circuit is connected to the input end of the filter and rectifier circuit and the input end of the drive control circuit.

[0009] Furthermore, the protection circuit includes a fuse resistor and a varistor;

[0010] One end of the fuse resistor is used to connect the live wire of the alternating current, the other end of the fuse resistor is respectively connected to one end of the varistor, the input end of the filter rectifier circuit and the input end of the drive control circuit, and the other end of the varistor is used to connect the neutral wire of the alternating current.

[0011] Furthermore, the filtering and rectifying circuit includes a rectifying bridge, a rectifying diode and a first capacitor;

[0012] The output end of the protection circuit is connected to the first input end of the rectifier bridge, and the second input end of the rectifier bridge is used for the neutral line of the alternating current; the first output end of the rectifier bridge is respectively connected to the input end of the drive control circuit and the positive electrode of the rectifier diode; the negative electrode of the rectifier diode is respectively connected to one end of the first capacitor and the input end of the drive control circuit; the second output end of the rectifier bridge and the other end of the first capacitor are grounded.

[0013] Further, the drive control circuit includes a switch control subcircuit and a lighting drive subcircuit;

[0014] The output end of the protection circuit is connected to the power supply input end of the lighting driving sub-circuit, and the output end of the filtering and rectifying circuit is respectively connected to the input end of the switch control sub-circuit and the first control end of the lighting driving sub-circuit; the first output end of the switch control sub-circuit is connected to the second control end of the lighting driving sub-circuit, and the second output end of the switch control sub-circuit is connected to the control end of the night light module; the power supply output end of the lighting driving sub-circuit is used to connect the main lighting module.

[0015] Further, the switch control subcircuit includes an IC module, a first resistor, a second capacitor and a third capacitor;

[0016] The output end of the filtering and rectifying circuit is connected to one end of the first resistor, and the other end of the first resistor is connected to the input end of the IC module; the first control end of the IC module is connected to one end of the second capacitor, and the second control end of the IC module is connected to one end of the third capacitor; the other ends of the second capacitor and the third capacitor are both grounded; the first output end of the IC module is connected to the second control end of the lighting driving subcircuit, and the second output end of the IC module is connected to the control end of the night light module.

[0017] Furthermore, the switch control subcircuit also includes a second resistor and a third resistor;

[0018] The third control terminal of the IC module is connected to one end of the second resistor, and the fourth control terminal of the IC module is connected to one end of the third resistor; the other ends of the second resistor and the third resistor are both grounded.

[0019] Further, the lighting drive subcircuit includes a solid-state relay;

[0020] The output end of the protection circuit is connected to the power supply input end of the solid-state relay; the output end of the filter and rectifier circuit is connected to the first control end of the solid-state relay, and the first output end of the switch control subcircuit is connected to the second control end of the solid-state relay; the power supply output end of the solid-state relay is used to connect the main lighting module.

[0021] Furthermore, the lighting driving sub-circuit further includes a fourth resistor, a fifth resistor and a fourth capacitor;

[0022] The output end of the filtering and rectifying circuit is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to one end of the fifth resistor; the other end of the fifth resistor is respectively connected to one end of the fourth capacitor and the first control end of the solid-state relay, and the other end of the fourth capacitor is connected to the second control end of the solid-state relay.

[0023] In order to solve the above technical problems, another technical solution adopted by the utility model is:

[0024] A night light driving device comprises the above-mentioned night light driving circuit.

[0025] The beneficial effect of the utility model is that the external alternating current is first converted into direct current through a filtering and rectifying circuit to realize the power supply function for the driving control circuit. The two output ends of the driving control circuit are respectively connected to the night light module and the main lighting module, and the corresponding circuit is turned on after the driving control circuit detects and judges the user's control signal, so as to realize the lighting mode switching of the night light module and the main lighting module. The utility model integrates the filtering and rectifying circuit, the driving control circuit and the night light module into one circuit. When the user needs to realize the night light function, the device integrated by the circuit can be directly installed on the existing main lighting module without replacing and adjusting the existing main lighting module circuit, thereby reducing the lighting cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a night light driving circuit provided by an embodiment of the utility model;

[0027] Figure 2 Another structural schematic diagram of a night light driving circuit provided by an embodiment of the utility model;

[0028] Figure 3 Another structural schematic diagram of a night light driving circuit provided by an embodiment of the utility model;

[0029] Figure 4 A circuit schematic diagram of a night light driving circuit provided by an embodiment of the utility model;

[0030] Description of labels:

[0031] 1. Filtering and rectifying circuit; 2. Driving control circuit; 3. Night light module; 4. Protection circuit; 21. Switch control subcircuit; 22. Lighting driving subcircuit; 5. Main lighting module; 200. A night light driving device. DETAILED DESCRIPTION

[0032] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0033] Please refer to Figure 1 , an embodiment of the utility model provides a night light driving circuit, including a filtering and rectifying circuit, a driving control circuit and a night light module;

[0034] The input end of the filter and rectifier circuit is used to connect to alternating current, the output end of the filter and rectifier circuit is respectively connected to the input end of the drive control circuit and the power supply end of the night light module, the first output end of the drive control circuit is connected to the control end of the night light module, and the second output end of the drive control circuit is used to connect to the main lighting module.

[0035] From the above description, it can be seen that the beneficial effect of the utility model is that the external alternating current is first converted into direct current through a filtering and rectifying circuit to realize the power supply function for the driving control circuit. The two output ends of the driving control circuit are respectively connected to the night light module and the main lighting module, and the corresponding circuit is turned on after the driving control circuit detects and judges the user's control signal, so as to realize the lighting mode switching of the night light module and the main lighting module. The utility model integrates the filtering and rectifying circuit, the driving control circuit and the night light module into one circuit. When the user needs to realize the night light function, the device integrated by the circuit can be directly installed on the existing main lighting module, without replacing and adjusting the existing main lighting module circuit, thereby reducing the lighting cost.

[0036] Further, a protection circuit is included;

[0037] The input end of the protection circuit is used to connect to the alternating current, and the output end of the protection circuit is connected to the input end of the filter and rectifier circuit and the input end of the drive control circuit.

[0038] It can be seen from the above description that the protection circuit is used to protect the back-end filtering and rectifying circuit, the driving control circuit and the night light module when a circuit fault or surge occurs.

[0039] Furthermore, the protection circuit includes a fuse resistor and a varistor;

[0040] One end of the fuse resistor is used to connect the live wire of the alternating current, the other end of the fuse resistor is respectively connected to one end of the varistor, the input end of the filter rectifier circuit and the input end of the drive control circuit, and the other end of the varistor is used to connect the neutral wire of the alternating current.

[0041] From the above description, it can be seen that the fuse resistor is used to fuse when a circuit fails to achieve circuit protection, and the varistor is used to absorb voltage to improve the circuit's ability to resist lightning surges.

[0042] Furthermore, the filtering and rectifying circuit includes a rectifying bridge, a rectifying diode and a first capacitor;

[0043] The output end of the protection circuit is connected to the first input end of the rectifier bridge, and the second input end of the rectifier bridge is used for the neutral line of the alternating current; the first output end of the rectifier bridge is respectively connected to the input end of the drive control circuit and the positive electrode of the rectifier diode; the negative electrode of the rectifier diode is respectively connected to one end of the first capacitor and the input end of the drive control circuit; the second output end of the rectifier bridge and the other end of the first capacitor are grounded.

[0044] From the above description, it can be seen that the rectifier bridge is used to convert alternating current into unidirectional direct current, the rectifier diode is used to ensure that the voltage waveform output by the rectifier bridge is positive, thereby providing a better signal source for the drive control circuit, and the first capacitor is used to filter and store energy for the voltage output by the rectifier diode, thereby providing more stable electrical energy for the drive control circuit.

[0045] Further, the drive control circuit includes a switch control subcircuit and a lighting drive subcircuit;

[0046] The output end of the protection circuit is connected to the power supply input end of the lighting driving sub-circuit, and the output end of the filtering and rectifying circuit is respectively connected to the input end of the switch control sub-circuit and the first control end of the lighting driving sub-circuit; the first output end of the switch control sub-circuit is connected to the second control end of the lighting driving sub-circuit, and the second output end of the switch control sub-circuit is connected to the control end of the night light module; the power supply output end of the lighting driving sub-circuit is used to connect the main lighting module.

[0047] From the above description, it can be seen that the switch control subcircuit controls the conduction and cutoff of different circuits in the lighting drive subcircuit, thereby realizing the power supply switching of the night light module and the main lighting module. The switch control module subcircuit, the lighting drive subcircuit and the night light module are integrated into one circuit, which enables users to conveniently install the night light function into existing LED lamps while providing users with a switch switching function.

[0048] Further, the switch control subcircuit includes an IC module, a first resistor, a second capacitor and a third capacitor;

[0049] The output end of the filtering and rectifying circuit is connected to one end of the first resistor, and the other end of the first resistor is connected to the input end of the IC module; the first control end of the IC module is connected to one end of the second capacitor, and the second control end of the IC module is connected to one end of the third capacitor; the other ends of the second capacitor and the third capacitor are both grounded; the first output end of the IC module is connected to the second control end of the lighting driving subcircuit, and the second output end of the IC module is connected to the control end of the night light module.

[0050] As can be seen from the above description, the IC module is used to detect the current switching state of the alternating current. The first resistor is used to power the IC module and also provide a signal source for the input voltage switching state. The second capacitor is used to set the switching time of the IC module, and the third capacitor is used to set the time for the IC module to reset to the initial state after the switch is switched.

[0051] Furthermore, the switch control subcircuit also includes a second resistor and a third resistor;

[0052] The third control terminal of the IC module is connected to one end of the second resistor, and the fourth control terminal of the IC module is connected to one end of the third resistor; the other ends of the second resistor and the third resistor are both grounded.

[0053] It can be seen from the above description that the second resistor and the third resistor are respectively used to set the operating current of different switch loops in the IC module, so as to control the power supply of the night light module and the main lighting module.

[0054] Further, the lighting drive subcircuit includes a solid-state relay;

[0055] The output end of the protection circuit is connected to the power supply input end of the solid-state relay; the output end of the filter and rectifier circuit is connected to the first control end of the solid-state relay, and the first output end of the switch control subcircuit is connected to the second control end of the solid-state relay; the power supply output end of the solid-state relay is used to connect the main lighting module.

[0056] From the above description, it can be seen that the solid-state relay controls the on and off of its built-in bidirectional thyristor through the light-emitting state of the built-in light-emitting tube. When the bidirectional thyristor is turned on, the AC power is directly supplied to the main lighting module through the protection circuit to realize the lighting of the main lighting module. When the bidirectional thyristor is turned off, the AC power is supplied to the night light module through the switch control subcircuit to realize the lighting of the night light. In this way, the functions of the night light and ordinary lighting are met at the same time.

[0057] Furthermore, the lighting driving sub-circuit further includes a fourth resistor, a fifth resistor and a fourth capacitor;

[0058] The output end of the filtering and rectifying circuit is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to one end of the fifth resistor; the other end of the fifth resistor is respectively connected to one end of the fourth capacitor and the first control end of the solid-state relay, and the other end of the fourth capacitor is connected to the second control end of the solid-state relay.

[0059] From the above description, it can be seen that the fourth resistor and the fifth resistor are used for current limiting and voltage division, so as to provide a suitable voltage and current for the solid-state relay. The fourth capacitor is used for filtering the voltage to protect the solid-state relay from voltage surge interference.

[0060] Another embodiment of the utility model provides a night light driving device, comprising the above-mentioned night light driving circuit.

[0061] From the above description, it can be seen that the beneficial effect of the utility model is that the external alternating current is first converted into direct current through a filtering and rectifying circuit to realize the power supply function for the driving control circuit. The two output ends of the driving control circuit are respectively connected to the night light module and the main lighting module, and the corresponding circuit is turned on after the driving control circuit detects and judges the user's control signal, so as to realize the lighting mode switching of the night light module and the main lighting module. The utility model integrates the filtering and rectifying circuit, the driving control circuit and the night light module into one circuit. When the user needs to realize the night light function, the device integrated by the circuit can be directly installed on the existing main lighting module, without replacing and adjusting the existing main lighting module circuit, thereby reducing the lighting cost.

[0062] The night light driving circuit and device provided by the embodiment of the utility model can be applied to LED lamps with only main lighting function. The device is installed to the mains power supply end of the LED lamp, so that the LED lamp is connected to the mains through the device, which can meet the switching between the night light function and the main lighting function, and there is no need to replace and adjust the existing LED lamp circuit, thereby reducing the lighting cost. The following is an explanation through a specific embodiment:

[0063] Please refer to Figures 1 to 4 , Embodiment 1 of the present utility model is:

[0064] A night light driving circuit comprises a filtering and rectifying circuit 1, a driving control circuit 2 and a night light module 3; Figure 1As shown, specifically, the input terminal r1 of the filter and rectifier circuit 1 is used to connect the alternating current L1 / N1, the output terminal c1 of the filter and rectifier circuit 1 is respectively connected to the input terminal r2 of the drive control circuit 2 and the power supply terminal g3 of the night light module 3, the first output terminal c21 of the drive control circuit 2 is connected to the control terminal k3 of the night light module 3, and the second output terminal c22 of the drive control circuit 2 is used to connect the main lighting module 5.

[0065] In some embodiments, the night light driving circuit further includes a protection circuit 4; Figure 2 As shown, specifically, the input terminal r4 of the protection circuit 4 is used to connect to the AC power L1 / N1 , and the output terminal c4 of the protection circuit 4 is connected to the input terminal r1 of the filter rectifier circuit 1 and the input terminal r2 of the drive control circuit 2 .

[0066] The night light driving circuit may further include an interface module, through which the protection circuit 4 is connected to the AC power, and at the same time, the second output terminal c22 of the driving control circuit 2 is connected to the main lighting module through the interface module. In this way, the night light driving circuit can be directly connected to the line between the main lighting module and the main power supply through the interface module, without replacing or adjusting the existing lighting line.

[0067] like Figure 3 as well as Figure 4 As shown, a circuit structure of the protection circuit 4, the filtering and rectifying circuit 1 and the driving control circuit 2 is described in detail below.

[0068] In some embodiments, the protection circuit 4 includes a fuse resistor F and a varistor RV1; specifically, one end of the fuse resistor F is used to connect the live wire L1 of the AC power L1 / N1, and the other end of the fuse resistor F is respectively connected to one end of the varistor RV1, the input end r1 of the filter rectifier circuit 1, and the input end r2 of the drive control circuit 2, and the other end of the varistor RV1 is used to connect the neutral wire N1 of the AC power L1 / N1. In this way, the live wire of the AC power is connected by the fuse resistor, and when the circuit fails, the fuse resistor is blown to protect the back-end circuit. At the same time, the varistor is connected to the back end of the fuse resistor, and the varistor absorbs the pulse voltage to prevent the back-end circuit from being damaged by lightning surge.

[0069] In some embodiments, the filter rectifier circuit 1 includes a rectifier bridge BR1, a rectifier diode D1 and a first capacitor E1; specifically, the output end of the protection circuit 4 is connected to the first input end 1~ of the rectifier bridge BR1, and the second input end 2~ of the rectifier bridge BR1 is used for the zero line N1 of the alternating current L1 / N1; the first output end + of the rectifier bridge BR1 is respectively connected to the input end r2 of the drive control circuit 2 and the positive electrode of the rectifier diode D1; the negative electrode of the rectifier diode D1 is respectively connected to one end of the first capacitor E1 and the input end r2 of the drive control circuit 2; the second output end - of the rectifier bridge BR1 and the other end of the first capacitor E1 are grounded. In this way, the rectifier bridge converts the alternating current into a unidirectional direct current, and at the same time, a rectifier diode is connected to the output end of the rectifier bridge to prevent the first capacitor at the rear end from charging the positive electrode of the rectifier bridge, so as to ensure that the voltage waveform of the positive electrode of the rectifier bridge is a positive waveform of the alternating current, thereby providing a better signal source for the drive control circuit. At the same time, the first capacitor converts the rippled DC output by the rectifier bridge into DC with smaller ripples after filtering, thereby providing a stable power supply for the drive control circuit.

[0070] In some embodiments, the drive control circuit 2 includes a switch control subcircuit 21 and a lighting drive subcircuit 22; Figure 3 As shown, specifically, the output terminal c4 of the protection circuit 4 is connected to the power supply input terminal g221 of the lighting drive subcircuit 22, and the output terminal c1 of the filter rectifier circuit 1 is respectively connected to the input terminal r21 of the switch control subcircuit 21 and the first control terminal k221 of the lighting drive subcircuit 22; the first output terminal c211 of the switch control subcircuit 21 is connected to the second control terminal k222 of the lighting drive subcircuit 22, and the second output terminal c212 of the switch control subcircuit 21 is connected to the control terminal k3 of the night light module 3; the power supply output terminal g222 of the lighting drive subcircuit 22 is used to connect the main lighting module 5. In this way, when the AC power is operated by the front-end switch to realize the action of power-on-off-power-on, the switch control subcircuit detects the switching action of the AC power, and sequentially cyclically controls the conduction and cutoff of the lighting drive subcircuit. When the lighting drive subcircuit is turned on, the live wire of the AC power supplies power to the main lighting module through L1-L2-L, and the neutral wire of the AC power supplies power to the main lighting module through N1-N2-N, and the main lighting is turned on at this time. When the lighting drive sub-circuit is turned off, the main lighting module does not light up because the power supply is cut off. At this time, the LED1-LEDn circuit of the night light module is turned on, and the night light module lights up.

[0071] In some embodiments, the switch control subcircuit 21 includes an IC module IC1, a first resistor R1, a second capacitor C2 and a third capacitor C3; specifically, the output terminal c1 of the filter rectifier circuit 1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the input terminal VIN of the IC module IC1; the first control terminal VDD of the IC module IC1 is connected to one end of the second capacitor C2, and the second control terminal VCC of the IC module IC1 is connected to one end of the third capacitor C3; the other ends of the second capacitor C2 and the third capacitor C3 are both grounded; the first output terminal OUT1 of the IC module IC1 is connected to the second control terminal k222 of the lighting drive subcircuit 22, and the second output terminal OUT2 of the IC module IC1 is connected to the control terminal k3 of the night light module 3.

[0072] Among them, the switch control subcircuit 21 also includes a second resistor R2 and a third resistor R3; specifically, the third control terminal REXT1 of the IC module IC1 is connected to one end of the second resistor R2, and the fourth control terminal REXT2 of the IC module IC1 is connected to one end of the third resistor R3; the other ends of the second resistor R2 and the third resistor R3 are both grounded, and the ground GND end of the IC module IC1 is also connected to the circuit ground GND. In this way, the IC module is used to detect the switching action of the AC point; the first resistor R1 is connected to the power supply pin Vin of the IC module to power the IC module, and at the same time provides the IC module with a signal source of the input voltage switching state; the second capacitor C2 is used to set the switching time of the IC module; the third capacitor C3 is used to set the time for the IC module to reset to the initial state after the switch is switched; the second resistor R2 is used to set the built-in switch loop 1 of the IC module, that is, the current from OUT1 to REXT1, thereby setting the working current of the built-in light-emitting tube of the solid-state relay in the lighting drive sub-circuit; the third resistor R3 is used to set the built-in switch loop 2 of the IC module, that is, the current from OUT2 to REXT2, and at the same time, the control end of the night light module is connected to OUT2 of the IC module, so based on the third resistor R3, the current of LED1 to LEDn can be set, that is, the brightness of the night light module can be set.

[0073] In some embodiments, the lighting driving subcircuit 22 includes a solid-state relay U; specifically, the output terminal c4 of the protection circuit 4 is connected to the power supply input terminal A of the solid-state relay U; the output terminal c1 of the filtering and rectifying circuit 1 is connected to the first control terminal k1 of the solid-state relay U, and the first output terminal c211 of the switch control subcircuit 21 is connected to the second control terminal k2 of the solid-state relay U; the power supply output terminal K of the solid-state relay U is used to connect the main lighting module 5.

[0074] The lighting drive subcircuit 22 further includes a fourth resistor R4, a fifth resistor R5 and a fourth capacitor C4; specifically, the output terminal c1 of the filter rectifier circuit 1 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5; the other end of the fifth resistor R5 is respectively connected to one end of the fourth capacitor C4 and the first control end k1 of the solid-state relay U, and the other end of the fourth capacitor C4 is connected to the second control end k2 of the solid-state relay U. In this way, the fourth resistor and the fifth resistor are used for current limiting and voltage division, thereby providing a suitable voltage and current for the built-in light-emitting tube of the solid-state relay, and the fourth capacitor C4 is connected in parallel to the built-in light-emitting tube of the solid-state relay U to filter out the pulse voltage and protect the built-in light-emitting tube of the solid-state relay from failure caused by interference or impact of the pulse voltage.

[0075] The working principle of the night light driving circuit of the utility model is as follows:

[0076] The mains power is input from the input terminals L1 and N1 of the circuit, while the output terminal L2 of the circuit is connected to the input terminal L of the main lighting module 5, and the output terminal N2 of the circuit is connected to the input terminal N of the main lighting module 5. When the mains power is powered on-off-on through the front-end switch operation, the circuit detects the switching action of the mains power through the IC module IC1, and sequentially cyclically controls the conduction and cutoff of the built-in light-emitting tube in the solid-state relay U, thereby controlling the conduction and cutoff of the built-in bidirectional thyristor of the solid-state relay U in the form of light control. When the built-in bidirectional thyristor of the solid-state relay U is turned on, the live wire end of the mains power is supplied to the main lighting module 5 through L1-L2-L, and the neutral wire end of the mains power is supplied to the main lighting module 5 through N1-N2-N, so that the main lighting is turned on. When the built-in bidirectional thyristor of the solid-state relay U is turned off, the main lighting module 5 does not light up because the power supply is cut off. At this time, the LED1-LEDn circuit in the night light module of the circuit is turned on, and the night light is turned on.

[0077] Please refer to Figures 1 to 4 , Embodiment 2 of the present utility model is:

[0078] A night light driving device 200 includes a night light driving circuit according to the first embodiment.

[0079] In summary, the utility model provides a night light driving circuit and device, which first powers the back-end circuit through the fuse resistor and varistor in the protection circuit to ensure the power supply safety of the circuit. Then, the external alternating current is converted into direct current through the rectifier bridge of the filter rectifier circuit to realize the power supply function of the drive control circuit. At the same time, the output direct current is filtered and stored based on the rectifier diode and the first capacitor to improve the stability of the power supply signal. Finally, the power supply signal output from the filter rectifier circuit is detected and judged by the switch control subcircuit to turn on the night light module or the main lighting module, so as to realize the lighting mode switching of the night light module and the main lighting module. The utility model integrates the filter rectifier circuit, the drive control circuit and the night light module into one circuit. When the user needs to realize the night light function, the device integrated in the circuit can be directly installed on the existing main lighting module, without replacing and adjusting the existing main lighting module circuit, thereby reducing the lighting cost.

[0080] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A night light driving circuit, characterized in that: Including filtering and rectifying circuit, driving control circuit and night light module; The input end of the filter and rectifier circuit is used to connect to alternating current, the output end of the filter and rectifier circuit is respectively connected to the input end of the drive control circuit and the power supply end of the night light module, the first output end of the drive control circuit is connected to the control end of the night light module, and the second output end of the drive control circuit is used to connect to the main lighting module.

2. A night light driving circuit according to claim 1, characterized in that: Also includes protection circuits; The input end of the protection circuit is used to connect to the alternating current, and the output end of the protection circuit is connected to the input end of the filter and rectifier circuit and the input end of the drive control circuit.

3. A night light driving circuit according to claim 2, characterized in that: The protection circuit includes a fuse resistor and a varistor; One end of the fuse resistor is used to connect the live wire of the alternating current, the other end of the fuse resistor is respectively connected to one end of the varistor, the input end of the filter rectifier circuit and the input end of the drive control circuit, and the other end of the varistor is used to connect the neutral wire of the alternating current.

4. A night light driving circuit according to claim 2, characterized in that: The filtering and rectifying circuit comprises a rectifying bridge, a rectifying diode and a first capacitor; The output end of the protection circuit is connected to the first input end of the rectifier bridge, and the second input end of the rectifier bridge is used for the neutral line of the alternating current; the first output end of the rectifier bridge is respectively connected to the input end of the drive control circuit and the positive electrode of the rectifier diode; the negative electrode of the rectifier diode is respectively connected to one end of the first capacitor and the input end of the drive control circuit; the second output end of the rectifier bridge and the other end of the first capacitor are grounded.

5. A night light driving circuit according to claim 2, characterized in that: The drive control circuit includes a switch control subcircuit and a lighting drive subcircuit; The output end of the protection circuit is connected to the power supply input end of the lighting driving sub-circuit, and the output end of the filtering and rectifying circuit is respectively connected to the input end of the switch control sub-circuit and the first control end of the lighting driving sub-circuit; the first output end of the switch control sub-circuit is connected to the second control end of the lighting driving sub-circuit, and the second output end of the switch control sub-circuit is connected to the control end of the night light module; the power supply output end of the lighting driving sub-circuit is used to connect the main lighting module.

6. A night light driving circuit according to claim 5, characterized in that: The switch control subcircuit includes an IC module, a first resistor, a second capacitor and a third capacitor; The output end of the filtering and rectifying circuit is connected to one end of the first resistor, and the other end of the first resistor is connected to the input end of the IC module; the first control end of the IC module is connected to one end of the second capacitor, and the second control end of the IC module is connected to one end of the third capacitor; the other ends of the second capacitor and the third capacitor are both grounded; the first output end of the IC module is connected to the second control end of the lighting driving subcircuit, and the second output end of the IC module is connected to the control end of the night light module.

7. A night light driving circuit according to claim 6, characterized in that: The switch control subcircuit further includes a second resistor and a third resistor; The third control terminal of the IC module is connected to one end of the second resistor, and the fourth control terminal of the IC module is connected to one end of the third resistor; the other ends of the second resistor and the third resistor are both grounded.

8. The night light driving circuit according to claim 5, characterized in that: The lighting drive subcircuit includes a solid-state relay; The output end of the protection circuit is connected to the power supply input end of the solid-state relay; the output end of the filter and rectifier circuit is connected to the first control end of the solid-state relay, and the first output end of the switch control subcircuit is connected to the second control end of the solid-state relay; the power supply output end of the solid-state relay is used to connect the main lighting module.

9. A night light driving circuit according to claim 8, characterized in that: The lighting driving sub-circuit further includes a fourth resistor, a fifth resistor and a fourth capacitor; The output end of the filtering and rectifying circuit is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to one end of the fifth resistor; the other end of the fifth resistor is respectively connected to one end of the fourth capacitor and the first control end of the solid-state relay, and the other end of the fourth capacitor is connected to the second control end of the solid-state relay.

10. A night light driving device, characterized in that: It comprises a night light driving circuit as described in any one of claims 1 to 9.

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