Delayed conduction circuit, driving circuit and lamp

Abstract

The utility model provides a time-delay conduction circuit (10), a driving circuit (30) and a lamp (40). The time-delay conduction circuit (10) comprises a switch module (100), a level conversion module (200), a time-delay module (300) and a control module (400). The first end of the level conversion module (200) is connected with the first end of the switch module (100), and the second end of the level conversion module (200) is connected with the control end of the switch module (100) through the time delay module (300) and the control module (400) in sequence. By means of the level conversion module (200), the time delay module (300) and the control module (400), time delay control over the switch module (100) can be achieved, the switch module (100) is turned on after the voltage provided by the power source (20) is stable, and therefore when the power source (20) generates surge current, the surge current cannot pass through the switched-off switch module (100).

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electronic circuits, and particularly relates to a delay conduction circuit, a driving circuit and a lamp. BACKGROUND

[0002] At present, the driving circuit of a traditional lighting device is usually directly connected with a power supply, so that the driving circuit is directly impacted by the inrush current of the power supply, thereby causing the lighting device to be unable to normally start up. Therefore, the capacity of the output capacitor of the power supply or the capacity of the input capacitor of the driving circuit is usually increased to solve the above problem. However, the excessive capacity causes the increase of the device size and the cost. CONTENT OF THE UTILITY MODEL

[0003] The inventor of the application realizes that the technical solution of increasing the capacity for solving the problem of inrush current impact of the traditional driving circuit causes the increase of the device size and the cost.

[0004] The application aims to provide a delay conduction circuit, a driving circuit and a lamp, and aims to solve the problem of inrush current impact of the traditional driving circuit.

[0005] The basic idea of the inventor of the application is to stagger the time node of connecting the power supply and the time node of turning on the delay conduction circuit, so as to block the impact of the inrush current through the delay conduction circuit.

[0006] The first aspect of the embodiment of the application provides a delay conduction circuit, comprising: a switching module, a first end of the switching module being used for being connected with a power supply; a level conversion module, a first end of the level conversion module being connected with the first end of the switching module, and the level conversion module being used for generating a first control signal based on an input voltage provided by the power supply; a delay module, a first end of the delay module being connected with a second end of the level conversion module, and the delay module being used for outputting a second control signal after delaying a preset time length when the first control signal is received; and a control module, a first end of the control module being connected with a second end of the delay module, a second end of the control module being connected with a control end of the switching module, and the control module being used for outputting a third control signal in the case that the second control signal is received, the third control signal being used for controlling the switching module to turn on.

[0007] In the embodiment, the delay control of the switching module can be realized through the level conversion module, the delay module and the control module, so that the switching module is turned on after the voltage provided by the power supply is stabilized, thereby causing the inrush current to be unable to pass through the switched-off switching module when the inrush current is generated by the power supply, and the blocking of the inrush current impact is realized.

[0008] In one embodiment, the level conversion module comprises an input filter unit, a level conversion unit, an output filter unit and an output voltage division unit; a first end of the input filter unit is connected with a first end of the switch module, a second end of the input filter unit is connected with a first end of the level conversion unit, a second end of the level conversion unit is connected with a first end of the output voltage division unit through the output filter unit, and a second end of the output voltage division unit is connected with the delay module; the second end of the level conversion unit is also connected with the delay module, the level conversion unit is configured to provide a working voltage to the delay module and the output voltage division unit, and the output voltage division unit is configured to generate the first control signal based on the working voltage.

[0009] In this embodiment, the input filter unit and the output filter unit can perform low-pass filtering on the transmitted electrical signal to filter out high-frequency components in the electrical signal, and the level conversion unit and the output voltage division unit can realize voltage conversion of the level to obtain a working voltage and a first control signal, wherein the working voltage can be used to drive other circuits and devices to work, and the first control signal can be recognized by other circuits and devices.

[0010] In one embodiment, the level conversion module further comprises a unidirectional conduction device, which is connected in series between the first end of the switch module and the first end of the input filter unit, and is configured to enable unidirectional transmission of current to the input filter unit.

[0011] The unidirectional conduction device of this embodiment is used to avoid reverse flow of current and affect normal operation of the power supply or other circuits.

[0012] In one embodiment, the delay module comprises a delay chip, which is configured to output the second control signal after delaying for a preset time period upon receiving the first control signal based on the working voltage.

[0013] The delay chip of this embodiment can recognize the first control signal and independently realize signal delay according to actual needs to output a corresponding second control signal. In the later stage, the preset time period set in the delay chip can be adjusted arbitrarily without changing the circuit.

[0014] In one embodiment, the control module comprises a grounding switch unit and an isolation transmission unit; a first end of the isolation transmission unit is connected with the level conversion module, a second end of the isolation transmission unit is connected with a first end of the grounding switch unit, a third end of the isolation transmission unit is connected with the switch module, a second end of the grounding switch unit is grounded, and a control end of the grounding switch unit is connected with the delay module; the grounding switch unit is used to be turned on after receiving the second control signal, and the isolation transmission unit is used to generate the third control signal based on the working voltage when the grounding switch unit is turned on.

[0015] According to actual needs and specific level parameters of the second control signal, a suitable type of switch unit in the grounding switch unit can be selected to turn on the grounding switch unit when the second control signal is received, thereby controlling the isolation transmission unit to be turned on. The isolation transmission unit can avoid direct connection between the switch module and the delay module, thereby avoiding the influence of high voltage in the switch module on the normal work of the delay module and the level conversion module.

[0016] In one embodiment, the isolation transmission unit comprises an optoelectronic coupler, a first end of a light emitter of the optoelectronic coupler is connected with the level conversion module, a second end of the light emitter of the optoelectronic coupler is connected with the first end of the grounding switch unit, a first end of a light receiver of the optoelectronic coupler is connected with the level conversion module, and a second end of the light receiver of the optoelectronic coupler is connected with the switch module.

[0017] The optoelectronic coupler of the embodiment can convert electrical signals into optical signals and then convert the optical signals into electrical signals. Due to the structural characteristics of the optoelectronic coupler, the above signal conversion is irreversible, thereby realizing the isolation between the switch module and the delay module.

[0018] In one embodiment, the switch module comprises a first switch unit and a second switch unit; the first switch unit and the second switch unit are reversely connected in series at an output positive pole or an output negative pole of the power supply.

[0019] The reversely connected first switch unit and second switch unit can completely disconnect the switch module when both the first switch unit and the second switch unit are turned off, and the current does not pass through the body diode of the traditional single switch unit in the existing scheme when the power supply is reversely connected.

[0020] In one embodiment, the switch module further comprises a first resistor, a second resistor, a third resistor and a fourth resistor; the first switch unit comprises a first MOS tube, the second switch unit comprises a second MOS tube, a first end of the first resistor is connected with the control module, a second end of the first resistor is connected with a first end of the second resistor, a first end of the third resistor and a first end of the fourth resistor respectively, a second end of the second resistor is connected with a control end of the first MOS tube, a second end of the third resistor is connected with a control end of the second MOS tube, and a second end of the fourth resistor is simultaneously connected with a drain of the first MOS tube and a drain of the second MOS tube, or the second end of the fourth resistor is simultaneously connected with a source of the first MOS tube and a source of the second MOS tube.

[0021] The first resistor, the second resistor, the third resistor and the fourth resistor can realize current limiting and voltage division of the electrical signal, so as to obtain the required voltage for turning on the first MOS tube and the second MOS tube according to the third control signal.

[0022] The second aspect of the embodiment of the present application provides a driving circuit comprising the delay turn-on circuit as described above, and the delay turn-on circuit is used to be connected with a power supply.

[0023] Since the driving circuit has the technical features of the delay turn-on circuit of any one of the above-mentioned embodiments, it also has the beneficial effects of the delay turn-on circuit of any one of the above-mentioned embodiments, and the embodiment will not be described in detail.

[0024] The third aspect of the embodiment of the present application provides a lamp comprising a light emitting device and a driving circuit as described above, and the light emitting device is connected with a power supply through the driving circuit.

[0025] Since the lamp has the technical features of the driving circuit of any one of the above-mentioned embodiments, it also has the beneficial effects of the driving circuit of any one of the above-mentioned embodiments, and the embodiment will not be described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A principle diagram of the delay turn-on circuit provided by one embodiment of the present application;

[0027] Figure 2 An example circuit principle diagram of the level conversion module and the delay module provided by one embodiment of the present application;

[0028] Figure 3 An example circuit principle diagram of the control module and the switch module provided by one embodiment of the present application;

[0029] Figure 4 A principle diagram of the driving circuit provided by one embodiment of the present application;

[0030] Figure 5 A schematic diagram of an electronic device according to an embodiment of the present application is provided.

[0031] In the drawings, each of the reference numerals represents:

[0032] 10, delay-on circuit; 20, power supply; 30, driving circuit; 40, lamp; 50, light emitting device; 100, switch module; 200, level conversion module; 210, input filter unit; 220, level conversion unit; 230, output filter unit; 240, output voltage division unit; 300, delay module; 400, control module; 410, grounding switch unit; 420, isolation transmission unit. DETAILED DESCRIPTION

[0033] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0035] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0036] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0037] Figure 1 A schematic diagram of a delay-on circuit according to an embodiment of the present application is shown, only the parts related to the present embodiment are shown for the convenience of description, and the details are as follows:

[0038] The delay-on circuit 10 comprises a switch module 100, a level conversion module 200, a delay module 300 and a control module 400.

[0039] The first end of the switch module 100 is configured to be connected with the power supply 20. The first end of the level conversion module 200 is connected with the first end of the switch module 100, and the level conversion module 200 is configured to generate a first control signal based on an input voltage provided by the power supply 20. The first end of the delay module 300 is connected with the second end of the level conversion module 200, and the delay module 300 is configured to output a second control signal after delaying for a preset time length when receiving the first control signal. The first end of the control module 400 is connected with the second end of the delay module 300, the second end of the control module 400 is connected with the control end of the switch module 100, and the control module 400 is configured to output a third control signal when receiving the second control signal, and the third control signal is configured to control the switch module 100 to turn on.

[0040] The second end of the switch module 100 can be connected with a power consumption module. For example, the second end of the switch module 100 can be connected with a DC / DC conversion circuit, and the power supply 20 can supply power to the DC / DC conversion circuit when the switch module 100 is turned on. The first end of the switch module 100 and the power supply 20 can be directly connected or indirectly connected. For example, the first end of the switch module 100 and the power supply 20 can be connected through an overcurrent protection circuit and an overvoltage protection circuit. The power supply 20 can be connected with the delay-on circuit 10 through a corresponding interface module. The specific circuit between the first end of the switch module 100 and the power supply 20 can be set according to actual needs.

[0041] The delay-on circuit 10 can realize delay control of the switch module 100 through the level conversion module 200, the delay module 300 and the control module 400, so that the switch module 100 is turned on after the voltage provided by the power supply 20 is stable, thereby preventing the inrush current from passing through the switch module 100 when the inrush current occurs in the power supply 20.

[0042] In an embodiment, as shown in Figure 2As shown, the level conversion module 200 includes an input filtering unit 210, a level conversion unit 220, an output filtering unit 230, and an output voltage divider unit 240. The first terminal of the input filtering unit 210 is connected to the first terminal of the switching module 100, and the second terminal of the input filtering unit 210 is connected to the first terminal of the level conversion unit 220. The second terminal of the level conversion unit 220 is connected to the first terminal of the output voltage divider unit 240 via the output filtering unit 230. The output terminal of the output voltage divider unit 240 is connected to the delay module 300. The second terminal of the level conversion unit 220 is also connected to the delay module 300. The level conversion unit 220 provides a working voltage VCC to the delay module 300 and the output voltage divider unit 240, and the output voltage divider unit 240 generates a first control signal based on the working voltage VCC.

[0043] For example, the input filtering unit 210 and the output filtering unit 230 can perform low-pass filtering on the transmitted electrical signal to filter out high-frequency components in the electrical signal.

[0044] Specifically, the output voltage divider unit 240 can divide the operating voltage VCC when it is present to obtain a first control signal, which can be a high-level signal. The level conversion unit 220 and the output voltage divider unit 240 can achieve voltage conversion to obtain the operating voltage VCC and the first control signal. The operating voltage VCC can be used to drive other circuits and devices, and the first control signal can be recognized by other circuits and devices.

[0045] In one embodiment, such as Figure 2 , Figure 3 As shown, the level conversion unit 220 includes a voltage regulator chip U2 and its peripheral circuitry. The voltage regulator chip U2 can regulate the input voltage to obtain a suitable operating voltage VCC.

[0046] Specifically, the operating voltage VCC can be 3V to 10V.

[0047] Both the input filtering unit 210 and the output filtering unit 230 include at least one capacitor connected between the level conversion unit 220 and ground, such as Figure 2 As shown, the input filtering unit 210 includes a capacitor C1, and the output filtering unit 230 includes a capacitor C3. The capacitor C1 is connected between the first terminal of the level conversion unit 220 and ground, and the capacitor C3 is connected between the second terminal of the level conversion unit 220 and ground.

[0048] The output voltage divider unit 240 can divide the operating voltage VCC using multiple resistors to obtain the first control signal. For example... Figure 2As shown in FIG. 2, the output voltage dividing unit 240 includes a resistor R13 and a resistor R14. A first end of the resistor R13 is connected to a second end of the level conversion unit 220. A second end of the resistor R13 is connected to a first end of the resistor R14 and the delay module 300, respectively. A second end of the resistor R14 is grounded.

[0049] In an embodiment, as shown in FIG. 2, the level conversion module 200 further includes a unidirectional conductor D1. The unidirectional conductor D1 is connected in a forward direction between the first end of the switch module 100 and the first end of the input filter unit 210, for unidirectional transmission of current from the first end of the switch module 100 to the input filter unit 210. Figure 2 、 Figure 3

[0050] Specifically, the unidirectional conductor D1 can include a diode. The unidirectional conductor D1 is used to avoid reverse current flow, which can affect the normal operation of the power supply 20 or other circuits.

[0051] In an embodiment, the delay module 300 includes a delay chip U3. The delay chip U3 is used to output a second control signal after a preset time delay based on the operating voltage VCC after receiving a first control signal.

[0052] It can be understood that the preset time delay can be set according to actual needs. In the case of rapid voltage boost of the input voltage of the power supply 20, the preset time delay can be set to a relatively small time delay.

[0053] For example, the preset time delay can be 20 ms to 500 ms.

[0054] The delay chip U3 can recognize the first control signal and independently realize signal delay according to actual needs to output a corresponding second control signal. In the later stage, without changing the circuit, the preset time delay set in the delay chip U3 can be adjusted arbitrarily. For example, the delay module 300 further includes a debugging interface connected to the delay chip U3. The debugging interface can be used to connect with an external control device. The external control device can control the delay chip U3 through the debugging interface to adjust the preset time delay.

[0055] In an embodiment, as shown in FIG. 2, Figure 2 、 Figure 3 ​As shown, the control module 400 comprises a grounding switch unit 410 and an isolation transmission unit 420. The first end of the isolation transmission unit 420 is connected with the level conversion module 200, the second end of the isolation transmission unit 420 is connected with the first end of the grounding switch unit 410, the third end of the isolation transmission unit 420 is connected with the switch module 100, the second end of the grounding switch unit 410 is grounded, and the control end of the grounding switch unit 410 is connected with the delay module 300. The grounding switch unit 410 is used to be turned on after receiving the second control signal, and the isolation transmission unit 420 is used to generate the third control signal based on the working voltage VCC in the case that the grounding switch unit 410 is turned on.

[0056] According to the actual demand and the specific level parameter of the second control signal, the type of the switch unit in the grounding switch unit 410 can be selected, so that the grounding switch unit 410 is turned on when receiving the second control signal, thereby controlling the isolation transmission unit 420 to be turned on. The isolation transmission unit 420 can realize the isolation between the switch module 100 and the delay module 300, and can also make the electrical signal be transmitted to the switch module 100 in one direction, avoiding the direct connection between the switch module 100 and the delay module 300, thereby avoiding the influence of the high voltage in the switch module 100 on the normal work of the delay module 300 and the level conversion module 200.

[0057] In an embodiment, as shown in Figure 2 、 Figure 3 As shown, the isolation transmission unit 420 comprises an optoelectronic coupler U1, the first end of the light emitter of the optoelectronic coupler U1 is connected with the level conversion module 200 through a resistor R7, the second end of the light emitter of the optoelectronic coupler U1 is connected with the first end of the grounding switch unit 410, the first end of the light receiver of the optoelectronic coupler U1 is connected with the level conversion module 200 through a resistor R8, and the second end of the light receiver of the optoelectronic coupler U1 is connected with the switch module 100.

[0058] In the case that the grounding switch unit 410 is not turned on, the light emitter of the optoelectronic coupler U1 does not emit light, therefore, the first end of the light receiver of the optoelectronic coupler U1 cannot be connected with the second end of the light receiver of the optoelectronic coupler U1, and the control module 400 stops outputting the third control signal.

[0059] In the case that the grounding switch unit 410 is turned on, the light emitter of the optoelectronic coupler U1 emits light, therefore, the first end of the light receiver of the optoelectronic coupler U1 is connected with the second end of the light receiver of the optoelectronic coupler U1, and the control module 400 can output the third control signal.

[0060] The photoelectric coupler U1 can convert an electrical signal into an optical signal, and then convert the optical signal into an electrical signal. Due to the structural characteristics of the photoelectric coupler U1, the signal conversion described above is irreversible, thereby achieving isolation between the switch module 100 and the delay module 300.

[0061] In some embodiments, the grounding switch unit 410 includes an N-type MOS tube Q3, a resistor R5, and a resistor R6. The drain of the N-type MOS tube Q3 is connected to the second end of the light emitter of the photoelectric coupler U1, the source of the N-type MOS tube Q3 is grounded, and the gate of the N-type MOS tube Q3 is connected to the delay module 300 through the resistor R5 to access the second control signal. The first end of the resistor R6 is connected to the gate of the N-type MOS tube Q3, and the second end of the resistor R6 is grounded.

[0062] In an embodiment, as shown in Figure 2 、 Figure 3 The switch module 100 includes a first switch unit Q1 and a second switch unit Q2 connected in series. The first switch unit Q1 and the second switch unit Q2 are connected in reverse series at the output positive or output negative of the power supply 20.

[0063] Through the reverse series connection of the first switch unit Q1 and the second switch unit Q2, the switch module 100 can be completely disconnected when both the first switch unit Q1 and the second switch unit Q2 are off. When the power supply 20 is reversed, the current will not flow through the body diode of a single switch unit as in the existing solution.

[0064] It should be noted that the conventional anti-reverse connection usually uses a diode to prevent reverse current flow. However, when the power supply 20 is normally connected, the voltage drop across the diode will cause serious heating, affecting safety and transmission efficiency of electrical energy. By reversing the second switch unit Q2, the reverse current flow can be prevented when the second switch unit Q2 is not conducting, and the on-resistance of the second switch unit Q2 is low when the second switch unit Q2 is conducting, resulting in lower heating.

[0065] In an embodiment, as shown in Figure 2 、 Figure 3As shown, the switch module 100 further comprises a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4. The first switch unit Q1 comprises a first MOS tube, the second switch unit Q2 comprises a second MOS tube, a first end of the first resistor R1 is connected with the control module 400, a second end of the first resistor R1 is connected with a first end of the second resistor R2, a first end of the third resistor R3 and a first end of the fourth resistor R4, a second end of the second resistor R2 is connected with a control end of the first MOS tube, a second end of the third resistor R3 is connected with a control end of the second MOS tube, a second end of the fourth resistor R4 is simultaneously connected with a drain of the first MOS tube and a drain of the second MOS tube, or the second end of the fourth resistor R4 is simultaneously connected with a source of the first MOS tube and a source of the second MOS tube.

[0066] The first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 can realize current limiting and voltage division of the electrical signal, so as to obtain the required voltage for turning on the first MOS tube and the second MOS tube according to the third control signal.

[0067] Specifically, in the case that the first MOS tube and the second MOS tube are both N-type MOS tubes, the second end of the fourth resistor R4 is simultaneously connected with the source of the first MOS tube and the source of the second MOS tube. In the case that the first MOS tube and the second MOS tube are both P-type MOS tubes, the second end of the fourth resistor R4 is simultaneously connected with the drain of the first MOS tube and the drain of the second MOS tube.

[0068] It should be noted that when there is only a forward connected MOS tube, the reverse connection of the power supply 20 will cause the current to be transmitted in the reverse direction from the body diode of the forward connected MOS tube. The problem caused by the reverse connection of the power supply 20 can be avoided by the second MOS tube which is turned off.

[0069] In some embodiments, the first switch unit Q1 and the second switch unit Q2 are reversely connected in series at the output negative pole of the power supply 20. Wherein, the output negative pole of the power supply 20 is grounded.

[0070] Specifically, the drain of the first MOS tube is grounded (i.e. connected with the output negative pole of the power supply 20), the source of the first MOS tube is connected with the source of the second MOS tube, and the drain of the second MOS tube can serve as a negative pole voltage output end VOUT- of the delay turn-on circuit 10.

[0071] It can be understood that only in the case that the first MOS tube and the second MOS tube are turned on at the same time, the power consuming module or device connected with the negative pole voltage output end VOUT- can be in communication with the power supply 20 through the delay turn-on circuit 10 and form a power supply loop to obtain electrical energy from the power supply 20.

[0072] Figure 4A principle schematic diagram of the driving circuit provided by an embodiment of the present application is shown, only parts related to the embodiment are shown for the convenience of description, and details are as follows:

[0073] The driving circuit 30 comprises the delay turn-on circuit 10 of any one of the above embodiments, and the delay turn-on circuit 10 is connected with the power supply 20. The driving circuit 30 can be used to adjust the power parameters provided by the power supply 20, and provide appropriate power to other circuits or modules. For example, the driving circuit 30 can regulate the input voltage provided by the power supply 20 to obtain the required driving voltage.

[0074] Since the driving circuit 30 has the technical features of the delay turn-on circuit 10 of any one of the above embodiments, it also has the beneficial effects of the delay turn-on circuit 10 of any one of the above embodiments, and the present embodiment will not be described in detail.

[0075] In some embodiments, the driving circuit 30 further comprises a DC / DC conversion circuit, and the DC / DC conversion circuit is connected with the power supply 20 through the delay turn-on circuit 10. The DC / DC conversion circuit can regulate the direct current provided by the power supply 20.

[0076] Figure 5 A principle schematic diagram of the lamp provided by an embodiment of the present application is shown, only parts related to the embodiment are shown for the convenience of description, and details are as follows:

[0077] The lamp 40 comprises a light emitting device 50 and the driving circuit 30 as described above, the light emitting device 50 is connected with the power supply 20 through the driving circuit 30, and the driving circuit 30 can provide driving voltage to the light emitting device 50 based on the power provided by the power supply 20.

[0078] The light emitting device 50 can comprise a LED lamp set.

[0079] Since the lamp 40 has the technical features of the driving circuit 30 of any one of the above embodiments, it also has the beneficial effects of the driving circuit 30 of any one of the above embodiments, and the present embodiment will not be described in detail.

[0080] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional units and modules is taken as an example, and in actual application, the above functions can be completed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit or module in the embodiment can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit, and the integrated unit can be realized in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit or module are only for convenient distinction, and are not used to limit the protection scope of the application. The specific working process of the units and modules in the system can refer to the corresponding process in the foregoing method embodiments, and will not be described here.

[0081] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in a certain embodiment can be referred to the relevant description of other embodiments.

[0082] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A delay-on circuit (10) characterized by comprising: The application relates to a switch module (100), a level conversion module (200), a delay module (300) and a control module (400). The first end of the switch module (100) is used for being connected with a power supply (20). The first end of the level conversion module (200) is connected with the first end of the switch module (100), and the level conversion module (200) generates a first control signal based on an input voltage provided by the power supply (20). The first end of the delay module (300) is connected with the second end of the level conversion module (200), and the delay module (300) is used for outputting a second control signal after delaying for a preset time length when the first control signal is received. The first end of the control module (400) is connected with the second end of the delay module (300), the second end of the control module (400) is connected with the control end of the switch module (100), and the control module (400) is used for outputting a third control signal for controlling the switch module (100) to be turned on when the second control signal is received.

2. The delay-on circuit (10) of claim 1, wherein, The level conversion module (200) comprises an input filter unit (210), a level conversion unit (220), an output filter unit (230) and an output voltage division unit (240). The first end of the input filter unit (210) is connected with the first end of the switch module (100), the second end of the input filter unit (210) is connected with the first end of the level conversion unit (220), the second end of the level conversion unit (220) is connected with the first end of the output voltage division unit (240) through the output filter unit (230), and the second end of the output voltage division unit (240) is connected with the delay module (300). The second end of the level conversion unit (220) is also connected with the delay module (300), the level conversion unit (220) is used for providing a working voltage (VCC) to the delay module (300) and the output voltage division unit (240), and the output voltage division unit (240) is used for generating the first control signal based on the working voltage (VCC).

3. The delay-on circuit (10) of claim 2, wherein, The level conversion module (200) further comprises a unidirectional conduction device (D1), the unidirectional conduction device (D1) is connected in series between the first end of the switch module (100) and the first end of the input filter unit (210), and is used for making the current unidirectionally transmit to the input filter unit (210).

4. The delay-on circuit (10) of claim 2, wherein, The delay module (300) comprises a delay chip (U3), the delay chip (U3) is used for outputting the second control signal after delaying for a preset time length when the first control signal is received based on the working voltage (VCC).

5. The delay-on circuit (10) of claim 2, wherein, The control module (400) comprises a grounding switch unit (410) and an isolation transmission unit (420). A first end of the isolation transmission unit (420) is connected with the level conversion module (200), a second end of the isolation transmission unit (420) is connected with a first end of the grounding switch unit (410), a third end of the isolation transmission unit (420) is connected with the switch module (100), a second end of the grounding switch unit (410) is grounded, and a control end of the grounding switch unit (410) is connected with the delay module (300). The grounding switch unit (410) is configured to be turned on after receiving the second control signal, and the isolation transmission unit (420) is configured to generate the third control signal based on the working voltage (VCC) when the grounding switch unit (410) is turned on.

6. The delay-on circuit (10) of claim 5, wherein the delay-on circuit (10) is configured to: The isolation transmission unit (420) includes an optoelectronic coupler (U1), a first end of a light emitter of the optoelectronic coupler (U1) is connected with the level conversion module (200), a second end of the light emitter of the optoelectronic coupler (U1) is connected with the first end of the grounding switch unit (410), a first end of a light receiver of the optoelectronic coupler (U1) is connected with the level conversion module (200), and a second end of the light receiver of the optoelectronic coupler (U1) is connected with the switch module (100).

7. The delay-on circuit (10) according to any one of claims 1 to 6, characterized in that The switch module (100) includes a first switch unit (Q1) and a second switch unit (Q2). The first switch unit (Q1) and the second switch unit (Q2) are reversely connected in series at an output positive pole or an output negative pole of the power supply (20).

8. The delay-on circuit (10) of claim 7, wherein the delay-on circuit (10) is further characterized by: The switch module (100) further includes a first resistor (R1), a second resistor (R2), a third resistor (R3), and a fourth resistor (R4). The first switch unit (Q1) includes a first MOS tube, the second switch unit (Q2) includes a second MOS tube, a first end of the first resistor (R1) is connected with the control module (400), a second end of the first resistor (R1) is connected with a first end of the second resistor (R2), a first end of the third resistor (R3), and a first end of the fourth resistor (R4) respectively, a second end of the second resistor (R2) is connected with a control end of the first MOS tube, a second end of the third resistor (R3) is connected with a control end of the second MOS tube, and a second end of the fourth resistor (R4) is connected with a drain of the first MOS tube and a drain of the second MOS tube simultaneously, or the second end of the fourth resistor (R4) is connected with a source of the first MOS tube and a source of the second MOS tube simultaneously.

9. A drive circuit (30), characterized by The delay turn-on circuit (10) is used to be connected with a power supply (20).

10. A luminaire (40) characterized by, The light emitting device (50) is connected with the power supply (20) through the driving circuit (30).

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