Overvoltage protection circuit and lamp

Abstract

The lamp comprises a power supply input end, a rectifier bridge and a driving circuit, the overvoltage protection circuit comprises a rectification sampling circuit, the sampling end of the rectification sampling circuit is arranged between the input end of the rectifier bridge and the power supply input end, and the rectification sampling circuit is used for collecting the power supply voltage input by the power supply input end; after rectification, a sampling signal is output; the input end of the resistance-capacitance division circuit is connected with the output end of the rectification sampling circuit, and the resistance-capacitance division circuit is used for carrying out voltage division and filtering on the sampling signal and then outputting a voltage signal; and the input end of the switching circuit is connected with the output end of the resistance-capacitance shunt circuit, the output end of the switching circuit is connected with the control end of the driving circuit, and the switching circuit is configured to output an overvoltage signal to the driving circuit when the voltage of the voltage signal is greater than a threshold voltage. According to the utility model, the overvoltage protection of the input voltage of the lamp is realized.

Description

Technical Field

[0001] The utility model relates to the field of overvoltage protection, in particular to an overvoltage protection circuit and a lamp. Background Art

[0002] As a lighting device, a lamp can be applied in various places. Therefore, the driving power supply of the lamp also needs to withstand various usage conditions. Among them, the fluctuation of the input voltage is one of the important reasons for the damage of the driving power supply of the lamp. In particular, when the input voltage is too high, it is very easy to damage the driving power supply of the lamp. Summary of the Invention

[0003] In view of the above deficiencies of the prior art, the purpose of the utility model is to provide an overvoltage protection circuit and a lamp to achieve overvoltage protection for the input voltage of the lamp.

[0004] The utility model provides an overvoltage protection circuit applied to a lamp. The lamp includes a power input terminal, a rectifier bridge and a driving circuit. The input terminal of the rectifier bridge is connected to the power input terminal, and the output terminal of the rectifier bridge is connected to the power supply terminal of the driving circuit. The overvoltage protection circuit includes:

[0005] A rectification sampling circuit, the sampling terminal of the rectification sampling circuit is arranged between the input terminal of the rectifier bridge and the power input terminal. The rectification sampling circuit is used to collect the power voltage input from the power input terminal and output a sampling signal after rectification;

[0006] A resistor-capacitor integration circuit, the input terminal of the resistor-capacitor integration circuit is connected to the output terminal of the rectification sampling circuit. The resistor-capacitor integration circuit is used to divide the voltage and filter the sampling signal and then output a voltage signal;

[0007] A switching circuit, the input terminal of the switching circuit is connected to the output terminal of the resistor-capacitor integration circuit, and the output terminal of the switching circuit is connected to the control terminal of the driving circuit. The switching circuit is configured to output an overvoltage signal to the driving circuit when the voltage of the voltage signal is greater than the threshold voltage.

[0008] Optionally, the switching circuit is further configured to output a working signal to the driving circuit when the voltage of the voltage signal is not greater than the threshold voltage.

[0009] Optionally, the resistor-capacitor integration circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, and a second capacitor. A first end of the first resistor is connected to an output end of the rectification and sampling circuit. A second end of the first resistor is connected to a first end of the second resistor. A second end of the second resistor is connected to a first end of the third resistor. A second end of the third resistor is interconnected with a first end of the first capacitor and a first end of the fourth resistor. A second end of the fourth resistor is interconnected with a first end of the fifth resistor and a first end of the second capacitor, and is connected to an input end of the switch circuit. A second end of the first capacitor, a second end of the fifth resistor, and a second end of the second capacitor are grounded.

[0010] Optionally, the rectification and sampling circuit includes a rectification device. An input end of the rectification device is disposed between an input end of a rectifier bridge and a power input end. An output end of the rectification device is connected to an input end of the resistor-capacitor integration circuit.

[0011] Optionally, the rectification device is a diode. An anode of the diode is disposed between an input end of the rectifier bridge and the power input end. A cathode of the diode is connected to an input end of the resistor-capacitor integration circuit.

[0012] Optionally, the switch circuit includes a switching device. A controlled end of the switching device is connected to an output end of the resistor-capacitor integration circuit. An output end of the switching device is connected to a control end of a drive circuit.

[0013] Optionally, the switching device is an NMOS transistor. A gate of the NMOS transistor is connected to the output end of the resistor-capacitor integration circuit. A drain of the NMOS transistor is connected to the control end of the drive circuit. A source of the NMOS transistor is grounded.

[0014] The present utility model further provides a lamp, including a lamp body, a power input end, a rectifier bridge, a drive circuit, and the overvoltage protection circuit as described above. The power input end is used for accessing a power supply voltage. An input end of the rectifier bridge is connected to the power input end. An output end of the rectifier bridge is connected to a power supply end of the drive circuit. An output end of the overvoltage protection circuit is connected to a control end of the drive circuit. An output end of the drive circuit is connected to an input end of the lamp body.

[0015] Optionally, the lamp further includes:

[0016] a housing, which forms a receiving cavity. A printed circuit board is received in the housing. The power input end, the rectifier bridge, the drive circuit, and the overvoltage protection circuit are disposed on the printed circuit board.

[0017] Optionally, the lamp body is an LED lamp.

[0018] The technical solution of the present utility model constitutes an overvoltage protection circuit through a rectifying and sampling circuit, a resistor-capacitor integrating circuit, and a switching circuit, which is applied to a lamp. The lamp includes a power input terminal, a rectifier bridge, and a driving circuit. Among them, the rectifying and sampling circuit is used to collect the power voltage input at the power input terminal and output a sampling signal after rectification; the resistor-capacitor integrating circuit is used to divide the voltage and filter the sampling signal and then output a voltage signal; the switching circuit is configured to output an overvoltage signal to the driving circuit when the voltage of the voltage signal is greater than the threshold voltage. In this way, when the voltage of the voltage signal is greater than the threshold voltage, an overvoltage signal can be output to the driving circuit to make the driving circuit stop working, thereby protecting the driving power supply.

[0019] The present utility model realizes overvoltage protection for the input voltage of the lamp. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0021] Figure 1 It is a schematic diagram of the functional modules of an embodiment of the overvoltage protection circuit of the present utility model.

[0022] Figure 2 It is a schematic diagram of the circuit structure of an embodiment of the overvoltage protection circuit of the present utility model.

[0023] Description of the reference numerals: 10, rectifying and sampling circuit; 20, resistor-capacitor integrating circuit; 30, switching circuit; D1, diode; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; C1, first capacitor; C2, second capacitor; V1, NMOS transistor. Detailed Embodiments

[0024] To make the purpose, technical solutions and effects of the present utility model clearer and more definite, the following will further describe the present utility model in detail with reference to the accompanying drawings and by way of examples. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0025] In the embodiments and the scope of the patent application, unless otherwise specifically defined in the text for articles, the words "a", "an", "the", and "said" may also include plural forms. If there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature.

[0026] It should be further understood that the term "comprising" used in the description of the present utility model means that there are the described features, integers, steps, operations, elements, and / or components, but does not exclude the existence or addition of one or more other features, integers, steps, operations, elements, components, and / or their groups. It should be understood that when an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used here may include wireless connection or wireless coupling. The phrase "and / or" used here includes all or any unit and all combinations of one or more related listed items.

[0027] Those skilled in the art of the present technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used here have the same meaning as the general understanding of those of ordinary skill in the art to which the present utility model belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined as here.

[0028] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0029] As a lighting device, a lamp can be applied in various places. Therefore, the driving power supply of the lamp also needs to withstand various usage conditions. Among them, the fluctuation of the input voltage is one of the important reasons for the damage of the driving power supply of the lamp, especially when the input voltage is too high, it is extremely easy to damage the driving power supply of the lamp.

[0030] For this reason, the present utility model provides an overvoltage protection circuit applied to a lamp. The lamp includes a power input terminal, a rectifier bridge, and a driving circuit. The input terminal of the rectifier bridge is connected to the power input terminal, and the output terminal of the rectifier bridge is connected to the power supply terminal of the driving circuit.

[0031] The power input terminal in the lamp is used to connect to an external AC power supply for power supply. The rectifier bridge is used to rectify the AC power supply and output it as a DC power supply to the drive circuit. The drive circuit can include devices such as a transformer, which transforms the DC power supply and outputs an appropriate DC power supply voltage to supply power to the LED lamp. In this way, the lamp has the function of emitting light for illumination.

[0032] Referring to Figure 1 , in one embodiment, the overvoltage protection circuit includes:

[0033] A rectifier sampling circuit 10, the sampling terminal of the rectifier sampling circuit 10 is arranged between the input terminal of the rectifier bridge and the power input terminal. The rectifier sampling circuit 10 is used to collect the power supply voltage input at the power input terminal, rectify it and then output a sampling signal;

[0034] A resistor-capacitor integration circuit 20, the input terminal of the resistor-capacitor integration circuit 20 is connected to the output terminal of the rectifier sampling circuit 10. The resistor-capacitor integration circuit 20 is used to divide the voltage and filter the sampling signal and then output a voltage signal;

[0035] A switch circuit 30, the input terminal of the switch circuit 30 is connected to the output terminal of the resistor-capacitor integration circuit 20, the output terminal of the switch circuit 30 is connected to the control terminal of the drive circuit. The switch circuit 30 is configured to output an overvoltage signal to the drive circuit when the voltage of the voltage signal is greater than the threshold voltage.

[0036] In this embodiment, the sampling terminal of the rectifier sampling circuit 10 is arranged between the input terminal of the rectifier bridge and the power input terminal, so as to directly sample the external AC power supply connected to the power input terminal in the lamp. The rectifier sampling circuit 10 can be composed of a diode D1 or other rectifier devices, so as to convert the external AC power supply into a DC power supply and then output it. It should be noted that at the output terminal of the rectifier bridge, a capacitor can be set to smooth the output voltage. When the drive circuit is not working, the voltage on the capacitor after the rectifier bridge is close to 1.414 times the input voltage; as the drive circuit works, the voltage will be pulled down; if the voltage is sampled after the output terminal of the rectifier bridge, due to the very large change in the voltage on the capacitor in the working state and the stopped state of the drive circuit, this will affect the voltage sampling. And in this embodiment, rectifier sampling is performed before the input terminal of the rectifier bridge, which can reduce the influence of voltage change on sampling. Performing rectifier sampling before the input terminal of the rectifier bridge can detect power supply problems, such as too low or too high voltage, faster, so as to avoid damaging the circuit. And perform preventive adjustment, such as by monitoring the input voltage, necessary adjustment or compensation can be carried out, such as adjusting the output of the transformer, etc., to ensure that the drive circuit can output stably.

[0037] The resistor-capacitor integration circuit 20 can be composed of electronic components such as resistors and capacitors. The specific number of resistors and capacitors can be set according to the actual situation. Through the resistor-capacitor integration circuit 20, the input voltage signal can be integrated, playing a role in smoothing the sampling signal, so that the switching circuit 30 can receive a stable and smooth voltage signal, thereby avoiding the situation that the voltage signal fluctuation causes the switching device in the switching circuit 30 to be mis-triggered, and enabling the driving circuit to stably control the LED lamp in the lamp. And the resistor can also play a role in voltage division, avoiding the sampling signal voltage collected being too high and causing damage to the electronic components in the switching circuit.

[0038] The switching circuit 30 can be composed of switching devices, such as switching devices like triodes or MOS transistors. The triode conducts or turns off according to the current signal, thereby outputting different electrical signals; while the MOS transistor can conduct or turn off according to the voltage signal, thereby outputting different electrical signals to the driving circuit. Taking the NMOS transistor V1 as an example, for instance, the enable terminal of the control chip in the driving circuit is connected to the output terminal of the switching device. When the voltage of the voltage signal is greater than the threshold voltage for the NMOS transistor V1 to conduct, the NMOS transistor V1 conducts and pulls down the voltage of the enable terminal of the control chip to ground, that is, an overvoltage signal is output, and the control chip in the driving circuit stops working, thereby protecting the power supply. The specific threshold voltage for the NMOS transistor V1 to conduct can be set according to the specific circuit structure and user requirements. And the switching device conducts or turns off according to the voltage signal, which is related to the selection of the switching device. Therefore, the corresponding switching device can be selected according to the actual circuit structure and user requirements.

[0039] The technical solution of the present utility model constitutes an overvoltage protection circuit through the rectification sampling circuit 10, the resistor-capacitor integration circuit 20, and the switching circuit 30, which is applied to a lamp. The lamp includes a power input terminal, a rectifier bridge, and a driving circuit. Among them, the rectification sampling circuit 10 is used to collect the power supply voltage input at the power input terminal and output a sampling signal after rectification; the resistor-capacitor integration circuit 20 is used to divide the voltage and filter the sampling signal and then output a voltage signal; the switching circuit 30 is configured to output an overvoltage signal to the driving circuit when the voltage of the voltage signal is greater than the threshold voltage. In this way, when the voltage of the voltage signal is greater than the threshold voltage, an overvoltage signal can be output to the driving circuit to make the driving circuit stop working, thereby protecting the driving power supply. The present utility model realizes overvoltage protection for the input voltage of the lamp.

[0040] In an embodiment, the switching circuit 30 is further configured to output a working signal to the driving circuit when the voltage of the voltage signal is not greater than the threshold voltage.

[0041] In this embodiment, taking the NMOS transistor V1 as an example, for instance, the enable terminal of the control chip in the driving circuit is connected to the output terminal of the switching device. When the voltage of the voltage signal is not greater than the threshold voltage for the NMOS transistor V1 to conduct, the NMOS transistor V1 is turned off. At this time, the voltage of the enable terminal of the control chip will not be pulled down to the ground, and it can be regarded as outputting a working signal without voltage to the driving circuit. The control chip in the driving circuit starts to work and normally supplies power to the LED lamp. In this way, the overvoltage protection circuit can not only output an overvoltage signal to the driving circuit to protect the driving power supply when the input power supply voltage is too high, but also will not affect the operation of the driving power supply when the input power supply voltage is normal.

[0042] Referring to Figure 2 , in one embodiment, the resistive-capacitive integration circuit 20 includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, and a second capacitor C2. The first end of the first resistor R1 is connected to the output terminal of the rectifying and sampling circuit 10. The second end of the first resistor R1 is connected to the first end of the second resistor R2. The second end of the second resistor R2 is connected to the first end of the third resistor R3. The second end of the third resistor R3 is interconnected with the first end of the first capacitor C1 and the first end of the fourth resistor R4. The second end of the fourth resistor R4 is interconnected with the first end of the fifth resistor R5 and the first end of the second capacitor C2, and is connected to the input terminal of the switching circuit 30. The second end of the first capacitor C1, the second end of the fifth resistor R5, and the second end of the second capacitor C2 are grounded.

[0043] In this embodiment, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 can divide the sampling signal output by the rectifying and sampling circuit 10 to achieve the effect of voltage reduction and prevent the switching device of the switching circuit 30 from being damaged due to excessive voltage. The first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 can also form a resistive-capacitive integration circuit 20 with the first capacitor C1 and the second capacitor C2 to integrate the input voltage signal, playing a role in smoothing the sampling signal, so that the switching circuit 30 can receive a stable and smooth voltage signal, thereby avoiding the situation where the switching device in the switching circuit 30 is mis-triggered due to the fluctuation of the voltage signal, and enabling the driving circuit to stably control the LED lamp in the lamp. In this embodiment, the specific parameters of the resistors and capacitors can be selected and set according to the actual situation and user requirements.

[0044] In one embodiment, the rectifying and sampling circuit 10 includes a rectifying device. The input terminal of the rectifying device is disposed between the input terminal of the rectifier bridge and the power input terminal. The output terminal of the rectifying device is connected to the input terminal of the resistive-capacitive integration circuit 20.

[0045] In this embodiment, the rectifying device in the rectifying and sampling circuit 10 can be a device such as diode D1 or thyristor, or a field-effect transistor can also be used for rectification. Specifically, different devices can be selected as the rectifying device in the rectifying and sampling circuit 10 according to the actual situation and user requirements.

[0046] Further, referring to Figure 2 , in an exemplary technique, the rectifying device is diode D1. The anode of the diode D1 is disposed between the input end of the rectifier bridge and the power input end, and the cathode of the diode D1 is connected to the input end of the resistor-capacitor integrating circuit 20. In this embodiment, using diode D1 as the rectifying device can perform half-wave rectification on the external power supply voltage connected to the power input end, thereby converting the external AC power supply into a DC power supply.

[0047] In one embodiment, the switching circuit 30 includes a switching device. The controlled end of the switching device is connected to the output end of the resistor-capacitor integrating circuit 20, and the output end of the switching device is connected to the control end of the driving circuit.

[0048] In this embodiment, the switching device in the switching circuit 30 can be a triode, MOS tube, thyristor and other devices. By different voltage values of the external power supply voltage, the on and off states of the switching device can be changed, so as to output different signals to the driving circuit to control the driving circuit to work or stop working.

[0049] Further, referring to Figure 2 , in an exemplary technique, the switching device is NMOS transistor V1. The gate of the NMOS transistor V1 is connected to the output end of the resistor-capacitor integrating circuit 20, the drain of the NMOS transistor V1 is connected to the control end of the driving circuit, and the source of the NMOS transistor V1 is grounded. In this embodiment, using NMOS transistor V1 as the switching device, the input end of the control chip in the driving circuit is connected to the drain of the NMOS transistor V1, and the source of the NMOS transistor V1 is grounded. Thus, when the voltage of the voltage signal is greater than the threshold voltage for the NMOS transistor V1 to conduct, the NMOS transistor V1 conducts. At this time, the voltage at the input end of the control chip is pulled down to the ground, and the control chip in the driving circuit stops working and does not supply power to the LED lamp. Specifically, the threshold voltage for the NMOS transistor V1 to conduct can be set according to the specific circuit structure and user requirements.

[0050] The present utility model also proposes a lighting fixture.

[0051] In one embodiment, the lighting fixture includes a lighting fixture body, a power input terminal, a rectifier bridge, a driving circuit, and the overvoltage protection circuit as described above. The power input terminal is used to connect to a power supply voltage. The input terminal of the rectifier bridge is connected to the power input terminal. The output terminal of the rectifier bridge is connected to the power supply terminal of the driving circuit. The output terminal of the overvoltage protection circuit is connected to the control terminal of the driving circuit. The output terminal of the driving circuit is connected to the input terminal of the lighting fixture body.

[0052] In this embodiment, the lighting fixture body can be an LED lamp or other lighting components. The power input terminal is used to connect to an external AC power supply for power supply. The rectifier bridge is used to rectify the AC power supply and output a DC power supply to the driving circuit after conversion. The driving circuit can include devices such as a transformer, which converts the DC power supply and outputs a suitable DC power supply voltage to supply power to the LED lamp. In this way, the lighting fixture has a lighting function.

[0053] In one embodiment, the lighting fixture further includes:

[0054] A housing, which forms a receiving cavity. A printed circuit board is received in the housing. The power input terminal, the rectifier bridge, the driving circuit, and the overvoltage protection circuit are disposed on the printed circuit board.

[0055] In this embodiment, the housing can be used to fix the positional relationship of the printed circuit board, ensuring the safety and stability inside the receiving cavity formed by the lighting fixture housing. When the lighting fixture is working, the positional relationship of the printed circuit board will not change, and external gases or objects cannot fall on the printed circuit board to affect the operation of the driving circuit and the overvoltage protection circuit on the circuit board. And the lighting fixture can also include a filtering circuit, such as an EMC filter (Electromagnetic Compatibility Filtering), which is disposed between the power input terminal and the rectifier bridge, and can reduce or suppress electromagnetic interference generated in electronic devices and circuits, while preventing the influence of external electromagnetic interference on the circuit.

[0056] In one embodiment, the lighting fixture body is an LED lamp. In this embodiment, an LED lamp can be used as the lighting device in the lighting fixture, and the specific quantity and type can be set according to the actual situation and user requirements.

[0057] It should be understood that the application of the present invention is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above description. All such improvements and transformations should fall within the protection scope of the appended claims of the present invention.

Claims

1. An overvoltage protection circuit is applied to a lamp. The lamp includes a power input terminal, a rectifier bridge, and a driving circuit. The input terminal of the rectifier bridge is connected to the power input terminal, and the output terminal of the rectifier bridge is connected to the power supply terminal of the driving circuit. It is characterized in that The overvoltage protection circuit includes: A rectifying and sampling circuit, the sampling end of which is arranged between the input end of the rectifier bridge and the power input end. The rectifying and sampling circuit is used to collect the power voltage input at the power input end, and outputs a sampling signal after rectification; A resistor-capacitor integrating circuit, the input end of which is connected to the output end of the rectifying and sampling circuit. The resistor-capacitor integrating circuit is used to divide the voltage and filter the sampling signal and then output a voltage signal; A switching circuit, the input end of which is connected to the output end of the resistor-capacitor integrating circuit, and the output end of which is connected to the control end of the driving circuit. The switching circuit is configured to output an overvoltage signal to the driving circuit when the voltage of the voltage signal is greater than the threshold voltage.

2. The overvoltage protection circuit according to claim 1, wherein The switching circuit is further configured to output a working signal to the driving circuit when the voltage of the voltage signal is not greater than the threshold voltage.

3. The overvoltage protection circuit according to claim 1, characterized in that, The resistor-capacitor integrating circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor and a second capacitor. The first end of the first resistor is connected to the output end of the rectifying and sampling circuit, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the first end of the third resistor, the second end of the third resistor is interconnected with the first end of the first capacitor and the first end of the fourth resistor, the second end of the fourth resistor is interconnected with the first end of the fifth resistor and the first end of the second capacitor, and is connected to the input end of the switching circuit. The second ends of the first capacitor, the fifth resistor and the second capacitor are grounded.

4. The overvoltage protection circuit according to claim 1, wherein The rectifying and sampling circuit includes a rectifying device, the input end of which is arranged between the input end of the rectifier bridge and the power input end, and the output end of which is connected to the input end of the resistor-capacitor integrating circuit.

5. The overvoltage protection circuit according to claim 4, wherein The rectifying device is a diode, the anode of which is arranged between the input end of the rectifier bridge and the power input end, and the cathode of which is connected to the input end of the resistor-capacitor integrating circuit.

6. The overvoltage protection circuit according to claim 1, characterized in that, The switching circuit includes a switching device, the controlled end of which is connected to the output end of the resistor-capacitor integrating circuit, and the output end of which is connected to the control end of the driving circuit.

7. The overvoltage protection circuit according to claim 6, wherein The switching device is an NMOS transistor, the gate of which is connected to the output end of the resistor-capacitor integrating circuit, the drain of which is connected to the control end of the driving circuit, and the source of which is grounded.

8. A lighting fixture, characterized in that, It includes a lamp body, a power input end, a rectifier bridge, a driving circuit and the overvoltage protection circuit according to any one of claims 1-7. The power input end is used to access the power voltage. The input end of the rectifier bridge is connected to the power input end, the output end of the rectifier bridge is connected to the power supply end of the driving circuit, the output end of the overvoltage protection circuit is connected to the control end of the driving circuit, and the output end of the driving circuit is connected to the input end of the lamp body.

9. The luminaire according to claim 8, characterized in that, The lamp further includes: A housing, a receiving cavity is formed in the housing, a printed circuit board is received in the housing, and the power input terminal, the rectifier bridge, the drive circuit and the overvoltage protection circuit are disposed on the printed circuit board.

10. The luminaire according to claim 8, characterized in that, The lamp body is an LED lamp.

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