Single-live-wire electricity-taking protection module

Abstract

The invention relates to a single-live-wire electricity-taking protection module. On the basis of the application, the single-live-wire power-taking protection module connected in parallel at the two ends of the lamp can generate a bypass effect for preventing the current in the power-taking loop from flowing through the lamp in the voltage zero point interval of the load voltage at the two ends of the lamp, and the bypass effect does not influence the normal work of the lamp in the turn-on state; by means of the bypass effect, when the lamp is in the turn-off state, the phenomenon that weak holding current in the power-taking loop flows through the lamp, and consequently, the phenomenon that when the lamp is in the turn-on state, the extraction current of the single-fire switch device flows through the lamp, and consequently, the phenomenon of stroboflash is caused can be avoided. Therefore, the single-live-wire power-taking protection module can suppress abnormal light emission of the lamp by utilizing a bypass mode independent of energy storage of a shunt capacitor or a high-power resistor, so that potential safety hazards caused by heating of components can be avoided while abnormal light emission of the lamp is suppressed, and relatively high load current is supported.

Description

Technical Field

[0001] The present application relates to power supply technology, and in particular to a single-fire power supply protection module and an intelligent lighting system. Background Art

[0002] A single-fire switch device (such as an intelligent switch panel) can only be connected to the input live wire and not the neutral wire. In addition, the single-fire switch device can also lead out a cascade live wire for cascade lamps. For example, the cascade lamps can include light-emitting elements such as LEDs (Light Emitting Diodes), that is, the cascade lamps can be energy-saving lamps.

[0003] Inside the single-fire switch device, a switch element such as a relay is provided between the input live wire and each cascade live wire, and the lamp connected to each cascade live wire is also connected to the neutral wire, so that: when the switch element between the input live wire and any cascade live wire is turned on, the sequentially turned-on input live wire, cascade live wire, lamp, and neutral wire can form a power-taking circuit, so that the lamp can take power from the input live wire through the cascade live wire; when the switch element between the input live wire and any cascade live wire is disconnected, the above-mentioned power-taking circuit is disconnected, that is, the lamp connected to the cascade live wire is powered off. That is, the switch element between the input live wire and each cascade live wire can be regarded as a control switch for the lamp connected to the cascade live wire.

[0004] In order to trigger the on and off of the control switch of the lamp, the single-fire switch device may include a control module and a power adapter for powering the control module, wherein the live wire terminal of the power adapter can be connected to the input live wire of the single-fire switch device. However, since the single-fire switch device is not directly connected to the neutral wire, the neutral wire terminal of the power adapter needs to be normally connected to the cascaded live wire so as to connect the neutral wire of the lamp through the cascaded live wire and the lamp.

[0005] However, the power adapter of the single-fire switch device uses the neutral line connected to the lamp, which may cause abnormal lighting of the lamp. For example, when the control switch corresponding to a lamp is disconnected (that is, the lamp is in the off state), the neutral line terminal of the power adapter of the single-fire switch device will generate a weak holding current, and the holding current will flow into the lamp through the cascade live wire, causing the lamp that should be normally off to intermittently produce weak light, commonly known as "ghost fire". For another example, when the control switch corresponding to a lamp is turned on (that is, the lamp is in the on state), if the power consumption of the single-fire switch device increases instantaneously due to some reasons, the power adapter of the single-fire switch device will cause the current to flow back from the lamp into the single-fire switch device, causing the lamp that should be normally on to alternately light up and down, commonly known as "strobe".

[0006] In order to avoid abnormal lighting such as "ghost fire" or "stroboscopic", the prior art attempts to connect capacitors or high-power resistors in parallel at both ends of the lamp to use the energy storage of the capacitor or resistor to absorb the current (such as maintaining current or drawing current) caused by the single-fire switch device flowing through the lamp. However, the capacitor or high-power resistor connected in parallel with the lamp is easy to heat up due to the direct connection to the cascade live wire, which leads to safety hazards in the power supply circuit. Moreover, in order to reduce the safety risks caused by the heating of the capacitor or high-power resistor, the load current in the cascade live wire also needs to be limited to a smaller rated range, so that the specifications of the lamps connected to the cascade live wire are limited.

[0007] It can be seen that how to suppress the abnormal lighting of the lamp while avoiding the safety hazards caused by the heating of components and expanding the rated range of the load current has become a technical problem to be solved in the prior art. Summary of the invention

[0008] The embodiments of the present application provide a power supply protection module and an intelligent lighting system, which help to suppress abnormal lighting of lamps, avoid safety hazards caused by heating of components, and expand the rated range of load current.

[0009] In one embodiment of the present application, a single-fire power supply protection module is provided, the single-fire power supply protection module is used to be connected in parallel with a lamp, the lamp is connected in series between the neutral line and the cascade live line drawn from the single-fire switch device, the single-fire power supply protection module has a live line terminal and a neutral line terminal for connecting the cascade live line and the neutral line at both ends of the lamp, respectively, and an internal circuit connected between the live line terminal and the neutral line terminal, and the single-fire power supply protection module includes:

[0010] A built-in power supply circuit, connected to the live wire terminal and the neutral wire terminal, and having a power supply generating terminal for generating an internal DC voltage using a load voltage at both ends of the lamp;

[0011] A loop switch circuit, located in the inner loop;

[0012] A reference generating circuit, connected to the live wire terminal and the neutral wire terminal, and having a reference generating terminal for generating a reference voltage that changes synchronously with the absolute value of the load voltage;

[0013] A switching control circuit is connected to the reference generating terminal and:

[0014] When the reference voltage is within the preset target voltage interval corresponding to the voltage zero point interval, the power supply of the internal DC voltage to the loop switch circuit is enabled by the switching control circuit, the internal loop is turned on by the loop switch circuit receiving the power supply, and the single-fire power supply protection module bypasses the parallel-connected lamps when the internal loop is turned on;

[0015] When the reference voltage is outside the preset target voltage range, the power supply of the internal DC voltage to the loop switch circuit is interrupted by the switching control circuit and canceled, the internal loop is disconnected by the loop switch circuit with power interrupted, and the single-fire power supply protection module cancels the bypass of the lamp when the internal loop is disconnected.

[0016] In some examples, optionally, the loop switch circuit has a circuit power receiving end, and the circuit power receiving end is connected to the power generating end; the switching control circuit includes a first switch tube, the first switch tube is connected in series between the power generating end and the ground, the control end of the first switch tube is connected to the reference generating end, and the preset target voltage interval is determined by the threshold voltage of the first switch tube, wherein: when the reference voltage is within the preset target voltage interval, the first switch tube is in a cut-off state, and an internal driving voltage generated based on the internal DC voltage is applied to the circuit power receiving end, so that the internal DC voltage enables the power supply of the loop switch circuit; when the reference voltage is outside the preset target voltage interval, the first switch tube is in a conducting state, and the circuit power receiving end is set to the ground potential through the first switch tube in the conducting state, so that the power supply of the internal DC voltage to the loop switch circuit is interrupted and cancelled.

[0017] In some examples, optionally, the reference generating circuit includes a voltage divider circuit, wherein two ends of the voltage divider circuit are respectively connected to the live wire terminal and the neutral wire terminal, the circuit impedance of the voltage divider circuit is greater than the load impedance of the lamp, the reference generating end is located at a voltage divider node of the voltage divider circuit, the reference voltage is the voltage divider voltage of the load voltage at the voltage divider node, and the voltage zero point interval is determined based on the threshold voltage of the first switching tube and the voltage divider ratio at the voltage divider node.

[0018] In some examples, optionally, the loop switch circuit includes a second switch tube, a third switch tube and a fourth switch tube, the second switch tube is connected in series in the internal loop, the third switch tube is connected in series between the circuit power receiving end of the loop switch circuit and the control end of the second switch tube, the fourth switch tube is connected in series between the control end of the second switch tube and the ground, the control ends of the third switch tube and the fourth switch tube are both connected to the circuit power receiving end, and the circuit power receiving end is connected to the power generating end, wherein: when the internal DC voltage is enabled by the switching control circuit to supply power to the loop switch circuit, the internal driving voltage generated based on the internal DC voltage is applied to the circuit power receiving end, so that the third switch The first switch is in the on state and the fourth switch is in the off state, and the control end of the second switch is clamped to the internal driving voltage through the on state of the third switch, so that the second switch is in the on state of turning on the internal loop; when the power supply of the internal DC voltage to the loop switch circuit is interrupted and cancelled by the switching control circuit, the control ends of the third switch and the fourth switch are set to the ground potential through the grounded circuit power receiving end, so that the third switch is in the off state and the fourth switch is in the on state, and the control end of the second switch is clamped to the ground potential through the on state of the fourth switch, so that the second switch is in the off state of disconnecting the internal loop.

[0019] In some examples, optionally, the second switch tube includes a pair of switch tubes respectively close to the live wire terminal and the neutral wire terminal.

[0020] In some examples, optionally, the circuit power receiving end is connected to the power generating end via a pull-up resistor, and the internal driving voltage has a voltage value of the internal DC voltage after voltage reduction based on the pull-up resistor.

[0021] In some examples, optionally, the loop switching circuit further includes a step-down resistor connected in series between the control ends of the third switch tube and the fourth switch tube and the power receiving end of the circuit, and a switch control voltage obtained by stepping down the internal driving voltage through the step-down resistor is applied to the control ends of the third switch tube and the fourth switch tube, and the switch control voltage causes the third switch tube to be in an on state and the fourth switch tube to be in an off state.

[0022] In some examples, optionally, the built-in power supply circuit includes: an energy storage circuit connected to the power generation end; a voltage stabilizing circuit connected to the power generation end; a rectifier circuit connected to the live wire terminal and the neutral wire terminal and having a current output end for generating a charging current; a first current source connected between the current output end and the energy storage circuit, wherein the first current source is normally enabled; a second current source connected in parallel with the first current source between the current output end and the energy storage circuit, wherein the second current source has a power enable end, the power enable end is connected to the power generation end, and: when the reference voltage is within the preset target voltage range, the start trigger of the internal DC voltage on the power enable end is enabled by the switching control circuit to enable the second current source; when the reference voltage is outside the preset target voltage range, the start trigger of the internal DC voltage on the power enable end is interrupted and cancelled by the switching control circuit to turn off the second current source.

[0023] In some examples, optionally, the first current source includes a first power supply internal resistor connected in series between the current output terminal and the energy storage circuit.

[0024] In some examples, optionally, the second current source includes a second power supply internal resistor and a fifth switch tube connected in series between the current output end and the energy storage circuit, and the second current source also includes a sixth switch tube, the sixth switch tube is connected in series between the second power supply internal resistor and the control end of the fifth switch tube, and the control end of the sixth switch tube is connected to the power enable end, wherein: when the reference voltage is within the preset target voltage range, the internal driving voltage generated based on the internal DC voltage is applied to the power enable end, and the fifth switch tube and the sixth switch tube are both in the on state, so that the start trigger of the internal DC voltage on the power enable end is enabled and effective; when the reference voltage is outside the preset target voltage range, the power enable end is set to the ground potential through the first switch tube in the on state, and the fifth switch tube and the sixth switch tube are both in the off state, so that the start trigger of the internal DC voltage on the power enable end is interrupted and cancelled.

[0025] In some examples, optionally, the switching control circuit includes a first switch tube, which is connected in series between the power generating end and ground, and the control end of the first switch tube is connected to the reference generating end, wherein: when the reference voltage is within the preset target voltage range, the first switch tube is in a cut-off state, and an internal driving voltage generated based on the internal DC voltage is applied to the power enable end, so that the start trigger of the internal DC voltage on the power enable end is enabled and effective; when the reference voltage is outside the preset target voltage range, the first switch tube is in a conducting state, and the power enable end is set to ground potential through the conducting state of the first switch tube, so that the start trigger of the internal DC voltage on the power enable end is interrupted and cancelled.

[0026] In some examples, optionally, the single-fire power supply protection module also includes: a loop sampling circuit, which is connected in series in the internal loop and has a sampling output end for generating a sampling voltage, wherein the sampling voltage changes synchronously with the current value of the loop current in the internal loop; a loop protection circuit, including a seventh switch tube and an eighth switch tube, wherein the seventh switch tube is connected in series between the power supply generating end and the neutral line, and the eighth switch tube is connected in series between the power supply generating end and the cascade live line, and the control ends of the seventh switch tube and the eighth switch tube are connected to the sampling output end, wherein: when the sampling voltage is lower than a preset safety voltage When the sampling voltage reaches a certain voltage threshold, the seventh switch tube and the eighth switch tube are both in the cut-off state, and the power supply of the loop switch circuit by the internal DC voltage is controlled by the switching control circuit; when the sampling voltage is higher than or equal to the preset safety voltage threshold, the seventh switch tube and the eighth switch tube are alternately in the on state in response to the change of the AC direction of the load voltage, so as to ground the internal DC voltage alternately through the neutral line or the cascade live line, so that the power supply of the loop switch circuit by the internal DC voltage is separated from the control of the switching control circuit and is forcibly interrupted.

[0027] In some examples, optionally, the sampling output terminal of the loop sampling circuit includes a first sampling output terminal and a second sampling output terminal located in the internal loop, and a ground reference terminal located between the first sampling output terminal and the second sampling output terminal, the loop sampling circuit includes a first sampling resistor connected in series between the first sampling output terminal and the ground reference terminal, and a second sampling resistor connected in series between the second sampling output terminal and the ground reference terminal, the first sampling output terminal is connected to the control terminal of the seventh switch tube, and the second sampling output terminal is connected to the control terminal of the eighth switch tube.

[0028] In some examples, optionally, the built-in power supply circuit is connected to the live wire terminal and the neutral wire terminal, and the built-in power supply circuit generates the internal DC voltage by storing energy of the load voltage.

[0029] In some examples, optionally, the reference generating circuit includes a voltage divider circuit, wherein two ends of the voltage divider circuit are respectively connected to the live wire terminal and the neutral wire terminal, the circuit impedance of the voltage divider circuit is greater than the load impedance of the lamp, and the reference generating end is located at a voltage divider node of the voltage divider circuit, and the reference voltage is the voltage divider voltage of the load voltage at the voltage divider node.

[0030] In some examples, optionally, the single-fire power supply protection module also includes: a loop sampling circuit, which is connected in series in the internal loop and has a sampling output end for generating a sampling voltage, wherein the sampling voltage changes synchronously with the current value of the loop current in the internal loop; and a loop protection circuit, which is connected to the sampling output end of the loop sampling circuit, and when the sampling voltage is higher than or equal to the preset safety voltage threshold, the loop protection circuit forcibly interrupts the power supply of the loop switching circuit by the internal DC voltage, and the power supply of the loop switching circuit by the internal DC voltage is separated from the control of the switching control circuit.

[0031] In some examples, optionally, the single-fire power supply protection module also includes an external protection circuit, wherein the built-in power supply circuit, the loop switching circuit and the reference generating circuit are all connected to the live wire terminal and the neutral wire terminal through the external protection circuit, and the external protection circuit includes a pair of current limiting resistors respectively connected in series with the live wire terminal and the reference generating circuit.

[0032] An embodiment of the present application also provides an intelligent lighting system, comprising the single-fire power supply protection module as described in the above embodiment, the single-fire switch device and the lamp, wherein the single-fire switch device comprises a power adapter, a control module powered by the power adapter, and a switch built-in capacitor connected in parallel at both ends of the control module, and the control switch between the cascade live wire and the input live wire is controlled by the control module.

[0033] Based on the above embodiment, the single-fire power supply protection module connected in parallel at both ends of the lamp has an internal circuit, and the internal circuit of the single-fire power supply protection module can be turned on in the voltage zero point interval of the load voltage, and the conduction of the internal circuit of the single-fire power supply protection module in the zero point interval can produce a bypass effect on the lamp to prevent the current in the power supply circuit where the cascaded live wire and the neutral wire are located from flowing through the lamp. Among them, the bypass effect produced by the single-fire power supply protection module on the lamp will not affect the normal operation of the lamp in the light-on state, and the bypass effect can: prevent the weak maintenance current in the power supply circuit where the cascaded live wire and the neutral wire are located from flowing through the lamp when the lamp is in the light-off state, so as to avoid the "ghost fire" phenomenon caused by the maintenance current flowing through the lamp, and when the lamp is in the light-on state, avoid the extraction current caused by the instantaneous increase in the power consumption of the single-fire switch device from flowing through the lamp, so as to avoid the "stroboscopic" phenomenon caused by the lamp being short of power due to the extraction current. Therefore, the single-fire power supply protection module can suppress the abnormal light emission of the lamp without relying on parallel capacitors or high-power resistors to store energy. Furthermore, it can avoid the safety hazards caused by heating of components while suppressing the abnormal light emission of the lamp. Moreover, there is no need to limit the load current to avoid heating of components, that is, the load current is allowed to have a larger rated range. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The following drawings are only used to illustrate and explain the present application, and do not limit the scope of the present application:

[0035] Figure 1 This is a schematic diagram of an application scenario of a single-fire power supply protection module in an embodiment of the present application;

[0036] Figure 2 This is an exemplary structural diagram of a single-fire power supply protection module in an embodiment of the present application;

[0037] Figure 3 This is a schematic diagram of the working principle of the single-fire power supply protection module in the embodiment of the present application when the lamp is lit;

[0038] Figure 4 This is a schematic diagram of a first suppression scenario of abnormal lighting of a lamp by a single-fire power supply protection module in an embodiment of the present application;

[0039] Figure 5 This is a schematic diagram of a second suppression scenario in which the single-fire power supply protection module in the embodiment of the present application suppresses abnormal light emission of the lamp;

[0040] Figure 6 This is a schematic diagram of the first example structure of a single-fire power supply protection module in an embodiment of the present application;

[0041] Figure 7 This is a schematic diagram of the optimized structure of the single-fire power supply protection module in the embodiment of the present application based on the built-in power supply optimization;

[0042] Figure 8 This is a schematic diagram of the second example structure of the single-fire power supply protection module in the embodiment of the present application;

[0043] Fig. 9 A schematic diagram of an optimized structure for introducing a loop protection mechanism into a single-fire power supply protection module in an embodiment of the present application;

[0044] Fig.10 This is a schematic diagram of the third example structure of the single-fire power supply protection module in the embodiment of the present application;

[0045] Fig.11 This is a schematic diagram of the optimal structure of the single-fire power supply protection module in the embodiment of the present application based on the built-in power supply optimization and the introduction of the loop protection mechanism;

[0046] Fig.12 This is a schematic diagram of the fourth example structure of the single-fire power supply protection module in the embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and examples.

[0048] Figure 1 This is a schematic diagram of the application scenario of the single-fire power protection module in the embodiment of this application. Figure 1 An embodiment of the present application provides a single-fire power supply protection module 30, which is used to be connected in parallel with a lamp 20, and the lamp 20 is connected in series between a neutral line N and a cascade live line L_s_i drawn from a single-fire switch device 10, wherein i is greater than or equal to 1 and less than or equal to m, and m is the total number of cascade live lines drawn from the single-fire switch device 10.

[0049] Specifically, in Figure 1 middle:

[0050] The single-fire switch device 10 includes a power adapter 11 and a control module 12 that receives power from the power adapter 11. The live wire terminal of the power adapter 11 can be connected to the input live wire L_in. The control switch (such as a relay) between each cascade live wire L_s_i and the input live wire L_in is controlled by the control module 12. In addition, the two ends of the control module 12 are also connected in parallel with a switch built-in capacitor C10.

[0051] The lamp 20 connected between each cascade live wire L_s_i and the neutral wire N can include a light-emitting module 200 connected in series between the cascade live wire L_s_i and the neutral wire N, and a built-in capacitor C20 of the lamp connected in series in the internal circuit of the lamp. For example, the lamp 20 can also include a rectifier 210, which can be connected between the light-emitting module 200 and the neutral wire N. The rectifier 210 is also connected in series in the internal circuit of the lamp where the built-in capacitor C20 of the lamp is located, and the internal circuit of the lamp also includes a lamp control module 220 connected in parallel with the built-in capacitor C20 of the lamp, wherein the light-emitting module 200 can include multiple light-emitting elements such as LEDs, and when the control switch corresponding to the lamp 20 is turned on (that is, the lamp 20 is turned on), the AC current provided by the cascade live wire L_s_i cooperates with the charging and discharging of the built-in capacitor C20 of the lamp to maintain the continuous illumination of the light-emitting module 200.

[0052] Figure 2 This is an exemplary structural diagram of a single-fire power supply protection module in an embodiment of the present application. Figure 2 And combined with Figure 1 In an embodiment of the present application, the single-fire power supply protection module 30 has a live wire terminal and a neutral wire terminal for respectively connecting the cascaded live wire L_s_i and the neutral wire N at both ends of the lamp 20, and an internal loop 300 connected between the live wire terminal and the neutral wire terminal. The load impedance of the lamp 20 at least includes the impedance of the light-emitting module 200.

[0053] like Figure 2 As shown, in an embodiment of the present application, the single-fire power protection module 30 may include a built-in power supply circuit 310 , a loop switch circuit 320 , a reference generating circuit 330 and a switching control circuit 340 .

[0054] The built-in power supply circuit 310 can be connected to the live wire terminal of the single-fire power supply protection module 30 for connecting the cascade live wire L_s_i, and the neutral wire terminal for connecting the neutral wire N, and the built-in power supply circuit 310 can generate an internal DC voltage Vcc using the load voltage (i.e., AC voltage) between the live wire terminal and the neutral wire terminal of the lamp 20. For example, the built-in power supply circuit 310 can have a power supply generating terminal for generating the internal DC voltage Vcc, and the built-in power supply circuit 310 can generate the internal power supply voltage Vcc by storing energy of the load voltage.

[0055] The loop switch circuit 320 is located in the internal loop 300 of the single-fire power supply protection module 30 , and the loop switch circuit 320 is used to control the on and off states of the internal loop 300 of the single-fire power supply protection module 30 .

[0056] The reference generating circuit 330 is connected to the single-fire power supply protection module 30 for connecting the live wire terminal of the cascade live wire L_s_i, and the neutral wire terminal for connecting the neutral wire N, and the reference generating circuit 330 has a reference generating terminal for generating a reference voltage V_ref, and the reference voltage V_ref changes synchronously with the absolute value of the voltage of the load voltage of the lamp.

[0057] The switching control circuit 340 is connected to the reference generating terminal of the reference generating circuit 330 for generating the reference voltage V_ref, and:

[0058] When the reference voltage V_ref is within the preset target voltage interval corresponding to the voltage zero point interval, the power supply of the internal DC voltage Vcc to the loop switch circuit 320 is enabled by the switching control circuit 340, and the internal loop 300 is turned on by the loop switch circuit 320 receiving the power supply, and the single-fire power protection module 30 can bypass the parallel lamp 20 when the internal loop 300 is turned on, that is, the path impedance of the parallel path between the two ends of the lamp 20 at this time is the loop impedance of the internal loop 300, and the loop impedance of the internal loop 300 is less than the load impedance of the lamp 20. For example, the loop impedance of the internal loop 300 can approach zero, so that the lamp 20 can be approximately short-circuited by the parallel path between its two ends;

[0059] When the reference voltage V_ref is outside the preset target voltage interval corresponding to the voltage zero point interval, the power supply of the internal DC voltage Vcc to the loop switch circuit 320 is interrupted and canceled by the switching control circuit 340, and the internal loop 300 is disconnected by the loop switch circuit 320 with power interrupted, and the single-fire power supply protection module 30 can cancel the bypass of the parallel lamp 20 when the internal loop 300 is disconnected, that is, the path impedance of the parallel path between the two ends of the lamp 20 is infinite at this time.

[0060] Based on the above embodiment, the single-fire power supply protection module 30 connected in parallel at both ends of the lamp 20 can be automatically started by self-power supply when there is current in the power supply circuit where the cascade live wire L_s_i and the neutral wire N are located, and can also automatically power off and shut down when there is no current in the power supply circuit where the cascade live wire L_s_i and the neutral wire N are located. Moreover, the self-power supply of the single-fire power supply protection module 30 can also be self-regulated according to the reference voltage V_ref, and the principle of self-regulation will be described in detail later.

[0061] Moreover, the single-fire power supply protection module 30 connected in parallel at both ends of the lamp 20 has an internal circuit 300. The internal circuit 300 of the single-fire power supply protection module 30 can be turned on when the load voltage is in the voltage zero point interval, and the conduction of the internal circuit 300 of the single-fire power supply protection module 30 in the voltage zero point interval can produce a bypass effect on the lamp 20 to prevent the current in the power supply circuit where the cascade live wire L_s_i and the neutral wire N are located from passing through the lamp 20.

[0062] Figure 3 This is a schematic diagram of the working principle of the single-fire power supply protection module in the embodiment of this application when the lamp is lit. Figure 3 , the voltage zero point interval U_z of the load voltage U_ac represents a voltage interval in which the voltage value of the load voltage U_ac is close to zero, and, when the control switch corresponding to the lamp 20 is turned on (that is, the lamp 20 is in the light-on state), the continuous light emission of the light-emitting module 200 of the lamp 20 depends on the discharge process of the built-in capacitor C20 of the lamp 20, that is, the load voltage U_ac is located in the voltage zero point interval U_z during the period when the built-in capacitor C20 of the lamp 20 is in the discharge process, and the charging of the built-in capacitor C20 of the lamp 20 using the working current I_opt in the power supply circuit where the cascade live wire L_s_i and the neutral wire N are located occurs when the load voltage U_ac is located outside the voltage zero point interval U_z, that is, the charging process of the built-in capacitor C20 of the lamp 20 using the working current I_opt occurs during the period when the load voltage U_ac is located in the voltage interval between the interval boundary of the zero point interval U_z and the peak and trough of the load voltage U_ac.

[0063] Therefore, the internal loop 300 of the single-fire power supply protection module 30 is disconnected when the load voltage U_ac is outside the zero point interval (i.e. Figure 3 "Off" in the figure) can ensure that the light-emitting module 200 of the lamp 20 emits light normally while charging the built-in capacitor C20 of the lamp normally, and when the internal loop 300 of the single-fire power supply protection module 30 is turned on when the load voltage U_ac is within the zero point interval (i.e. Figure 3 In the figure, the lamp 20 is turned on when the load voltage U_ac is within the zero interval (i.e., the internal circuit 300 of the single-fire power supply protection module 30 is turned on when the load voltage U_ac is within the zero interval). Figure 3 The bypass effect of the lamp 20 produced by the “On” in the figure will not affect the normal operation of the lamp 20 in the light-on state.

[0064] Figure 4This is a schematic diagram of the first suppression scenario of abnormal lighting of a lamp by the single-fire power supply protection module in the embodiment of the present application. Figure 4 When the control switch corresponding to the lamp 20 is disconnected (ie, the lamp 20 is in the off state), a weak holding current I_low may appear in the power supply circuit where the cascade live wire L_s_i and the neutral wire N are located, and the holding current I_low still causes the lamp 20 to have a load voltage U_ac.

[0065] When the load voltage U_ac is within the zero point interval, the internal circuit 300 of the single-fire power supply protection module 30 is turned on, and the lamp 20 cannot use the cascade live wire L_s_i to obtain power because it is bypassed by the single-fire power supply protection module 30, thereby preventing the light-emitting module 200 of the lamp 20 from emitting light. Moreover, when the load voltage U_ac is within the zero point interval, the built-in capacitor C20 of the lamp cannot be charged, and the current in the power supply circuit can be charged to the built-in capacitor C10 of the switch of the single-fire switch device 10 to the maximum extent.

[0066] When the load voltage U_ac is outside the zero interval, the internal circuit 300 of the single-fire power supply protection module 30 is disconnected (i.e. Figure 3 In the power supply circuit, the bypass effect of the single-fire power supply protection module 30 on the lamp 20 disappears, so that the lamp 20 is connected in series with the single-fire switch device 10 in the power supply circuit. During this period, since the switch built-in capacitor C10 of the single-fire switch device 10 is in a charged state, the power consumption requirement of the single-fire switch device 10 can be met by the internal discharge of the switch built-in capacitor C10, and no current will be generated in the power supply circuit to flow through the lamp 20, thereby preventing the light-emitting module 200 of the lamp 20 from emitting light, and the built-in capacitor C20 of the lamp will not be charged.

[0067] That is, the internal circuit 300 of the single-fire power supply protection module 30 is turned on in the zero point interval (i.e. Figure 4 The bypass effect produced by the “On” in the “ON” of the lamp 20 on the lamp 20 can prevent the weak maintenance current I_low in the power supply circuit where the cascade live wire L_s_i and the neutral wire N are located from flowing through the lamp when the lamp 200 is in the off state, thereby avoiding the “ghost fire” phenomenon caused by the maintenance current I_low flowing through the lamp 20.

[0068] Figure 5 This is a schematic diagram of the second suppression scenario in which the single-fire power supply protection module in the embodiment of the present application suppresses abnormal lighting of the lamp. Figure 5 , the control switch corresponding to the lamp 20 is turned on (i.e., the lamp 20 is in the on state), and:

[0069] When the load voltage U_ac is within the zero point interval, the internal loop 300 of the single-fire power supply protection module 30 is turned on (i.e. Figure 3"On" in the power supply circuit), when the load voltage U_ac is in the zero point interval, the current of the power supply circuit can be maximally charged into the switch built-in capacitor C10 of the single-fire switch device 10, and the lamp 20 bypassed by the single-fire power supply protection module 30 can rely on the discharge of the lamp built-in capacitor C20 after charging and energy storage to maintain the normal lighting of the light-emitting module 200, wherein the lamp built-in capacitor C20 in the lamp 20 can be charged when the load voltage U_ac is outside the zero point interval. At this time, if the power consumption of the single-fire switch device 10 increases instantaneously, the resulting extraction current I_rvs will not come from the lamp 20 bypassed by the single-fire power supply protection module 30, that is, the current generated by the discharge of the lamp built-in capacitor C20 will not be reversely extracted by the single-fire switch device 10, thereby avoiding the instantaneous light-out of the light-emitting module 200 in the lamp 20 due to insufficient light-emitting energy due to the reverse extraction of current.

[0070] When the load voltage U_ac is outside the zero interval, the internal circuit 300 of the single-fire power supply protection module 30 is disconnected (i.e. Figure 3 "Off" in the circuit), and the light-emitting module 200 of the lamp 20 normally connected in series in the power supply circuit can emit light normally, and the built-in capacitor C20 of the lamp can be charged normally. During this period, since the built-in capacitor C10 of the switch of the single-fire switch device 10 is in a charged state, even if the power consumption of the single-fire switch device 10 increases instantaneously, the internal discharge of the built-in capacitor C10 can meet the power supply demand of the instantaneous increase in power consumption, and will not cause the extraction current I_rvs drawn from the lamp 20 in the power supply circuit, thereby avoiding the instantaneous light-off of the light-emitting module 200 in the lamp 20 due to insufficient light-emitting energy due to reverse current extraction.

[0071] That is, the internal circuit 300 of the single-fire power supply protection module 30 is turned on in the zero point interval (i.e. Figure 4 The bypass effect produced by the “On” in the “ON” in the “ON” on the lamp 20 can also avoid the draw of current I_rvs to cause the lamp 20 to run out of power due to the current generated by the discharge of the built-in capacitor C20 when the control switch corresponding to the lamp 20 is turned on (that is, the lamp 20 is in the light-on state) and the built-in capacitor C10 of the switch is charged for energy storage, and avoid the “stroboscopic” phenomenon of the lamp 20 caused by the run-out of power.

[0072] like Figure 4 and Figure 5It can be seen that the single-fire power supply protection module 30 can suppress the abnormal light emission of the lamp 20 without relying on parallel capacitors or high-power resistors to store energy. Furthermore, it can suppress the abnormal light emission of the lamp 20 while avoiding the safety hazards caused by the heating of components. Moreover, there is no need to limit the load current in order to avoid the heating of components. That is, the load current in the power supply circuit where the cascaded live wire L_s_i and the neutral wire N are located is allowed to have a larger rated range.

[0073] Figure 6 This is a schematic diagram of the first example structure of a single-fire power supply protection module in an embodiment of the present application.

[0074] See also Figure 6 In an embodiment of the present application, the loop switch circuit 320 may have a circuit power receiving end, the circuit power receiving end of the loop switch circuit 320 is connected to the power generating end of the built-in power supply circuit 310 for generating an internal DC voltage Vcc, and the switching control circuit 340 may include a first switch tube T40.

[0075] Among them, the first switch tube T40 of the switching control circuit 340 is connected in series between the power supply generating terminal of the built-in power supply circuit 310 for generating the internal DC voltage Vcc and the ground. The control terminal of the first switch tube T40 is connected to the reference generating terminal. For example, the first switch tube T40 can be a transistor such as an NPN-type triode. The collector of the first switch tube T40 is connected to the power supply generating terminal of the built-in power supply circuit 310 for generating the internal DC voltage Vcc, the emitter is grounded, and the base is used as the control terminal. In addition, the control terminal of the first switch tube T40 can also be grounded through a pull-down resistor R40.

[0076] When the reference voltage V_ref is within the preset target voltage interval corresponding to the voltage zero point interval, the first switch tube T40 is in the cut-off state, and the internal driving voltage V_drv generated based on the internal DC voltage Vcc is applied to the circuit power receiving end of the loop switch circuit 320. For example, the circuit power receiving end of the loop switch circuit 320 can be connected to the power supply generating end of the built-in power supply circuit 310 for generating the internal DC voltage Vcc through the pull-up resistor R10. In this case, the internal driving voltage V_drv can have a voltage value after the internal DC voltage Vcc is stepped down based on the pull-up resistor R10, and the internal driving voltage V_drv can enable the internal DC voltage Vcc to power the loop switch circuit 320, so that the internal loop 300 is turned on by the loop switch circuit 320 receiving power.

[0077] When the reference voltage V_ref is outside the preset target voltage interval corresponding to the voltage zero point interval, the first switch tube T40 is in the on state, and the circuit receiving end of the loop switch circuit 320 is set to the ground potential through the first switch tube T40 in the on state, so that the power supply of the internal DC voltage Vcc to the loop switch circuit 320 is interrupted and cancelled, thereby disconnecting the loop switch circuit 320 with the power supply interrupted in the internal loop 300.

[0078] That is, the preset target voltage interval for representing the voltage zero point interval may be determined by the threshold voltage of the first switch tube T40. For example, the threshold voltage of the first switch tube T40 may serve as the upper boundary of the preset target voltage interval.

[0079] Still see Figure 6 , the reference generating circuit 330 includes a voltage dividing circuit, wherein the two ends of the voltage dividing circuit are respectively connected to the live wire terminal of the single-fire power supply protection module 30 for connecting the cascade live wire L_s_i, and the neutral wire terminal for connecting the neutral wire N, that is, the sum of the resistances of the first group of voltage dividing resistors R31 and R32, and the second group of voltage dividing resistors R33 and R34 in the voltage dividing circuit is greater than the load impedance of the lamp 20, and the reference generating end of the reference generating circuit 330 is located at the voltage dividing node of the voltage dividing circuit, that is, the connection node between the first group of voltage dividing resistors R31 and R32, and the second group of voltage dividing resistors R33 and R34, and the reference voltage V_ref is the voltage dividing voltage of the load voltage at the voltage dividing node. In this case, the voltage zero point interval can be determined based on the threshold voltage of the first switch tube T40 and the voltage dividing ratio at the voltage dividing node. For example, the interval boundary of the voltage zero point interval can be determined by the quotient of the threshold voltage of the first switch tube T40 and the voltage dividing ratio of the voltage dividing circuit.

[0080] Please continue to see Figure 6 The loop switch circuit 320 may include a second switch tube Q21 and Q22, a third switch tube T21, and a fourth switch tube T22, wherein the second switch tubes Q21 and Q22 may include a pair of switch tubes respectively close to the single-fire power supply protection module 30 for connecting the live wire terminal of the cascade live wire L_s_i, and the neutral wire terminal for connecting the neutral wire N.

[0081] The second switch tubes Q21 and Q22 are connected in series in the internal loop 300 of the reference generating circuit 330. For example, the second switch tubes Q21 and Q22 can be transistors such as N-MOSFET (N-Metal Oxide Semiconductor Field Effect Transistor), and the drains of the second switch tubes Q21 and Q22 can be respectively connected to the live wire terminal of the single-fire power supply protection module 30 for connecting the cascade live wire L_s_i, and the neutral wire terminal for connecting the neutral wire N, the sources of the second switch tubes Q21 and Q22 can be connected to the ground node in the internal loop 300, and the gates of the second switch tubes Q21 and Q22 can be used as control terminals.

[0082] The third switch tube T21 is connected in series between the circuit receiving end of the loop switch circuit 320 and the control ends of the second switch tubes Q21 and Q22. The fourth switch tube T22 is connected in series between the control ends of the second switch tubes Q21 and Q22 and the ground. The control ends of the third switch tube T21 and the fourth switch tube T22 are both connected to the circuit receiving end of the loop switch circuit 320. As mentioned above, the circuit receiving end of the loop switch circuit 320 is connected to the power generating end of the built-in power supply circuit 310 for generating the internal DC voltage Vcc.

[0083] Among them, the third switch tube T21 and the fourth switch tube T22 can be a pair of transistors with opposite on and off states. For example, the third switch tube T21 can be an NPN transistor and the fourth switch tube T22 can be a PNP transistor. The collector of the third switch tube T21 is connected to the circuit receiving end of the loop switch circuit 320, the emitter is connected to the control end of the second switch tubes Q21 and Q22, and the base is used as the control end. The emitter of the fourth switch tube T22 is connected to the control end of the second switch tubes Q21 and Q22, the collector is grounded, and the base is used as the control end.

[0084] When the power supply of the internal DC voltage Vcc to the loop switch circuit 320 is enabled by the switching control circuit 340, the internal driving voltage V_drv generated based on the internal DC voltage Vcc is applied to the circuit power receiving end of the loop switch circuit 320, so that the third switch tube T21 is in the on state and the fourth switch tube T22 is in the off state, and the control ends of the second switch tubes Q21 and Q22 are clamped to the internal driving voltage V_drv through the on-state third switch T21, so that the second switch tubes Q21 and Q22 are in the on state to turn on the internal loop 300 of the single-fire power supply protection module 30.

[0085] For example, in Figure 6In the embodiment, the loop switch circuit 320 may further include a step-down resistor R20 connected in series between the control ends of the third switch tube T21 and the fourth switch tube T22 and the circuit power receiving end. In this case, the switch control voltage obtained by stepping down the internal drive voltage V_drv through the step-down resistor R20 is applied to the control ends of the third switch tube T21 and the fourth switch tube T22, and the switch control voltage obtained by stepping down the internal drive voltage V_drv causes the third switch tube T21 to be in the on state and the fourth switch tube T22 to be in the off state.

[0086] When the power supply of the internal DC voltage Vcc to the loop switch circuit 320 is interrupted and cancelled by the switching control circuit 340, the control ends of the third switch tube T21 and the fourth switch tube T22 are set to the ground potential through the grounded circuit power receiving end (regardless of whether the voltage drop resistor R20 is included between the control ends of the third switch tube T21 and the fourth switch tube T22 and the circuit power receiving end), so that the third switch tube T21 is in the off state and the fourth switch tube T22 is in the on state, and the control ends of the second switch tubes Q21 and Q22 are clamped at the ground potential through the fourth switch tube T22 in the on state, so that the second switch tubes Q21 and Q22 are in the off state to disconnect the internal loop 300 of the single-fire power supply protection module 30.

[0087] In an embodiment of the present application, if the built-in power supply circuit 310 can generate an internal power supply voltage Vcc by storing energy of the load voltage, then two charging modes can be configured for the built-in power supply circuit 310, and the mode switching between the two charging modes of the built-in power supply circuit 310 can be synchronized with the state switching of the internal loop 300 and controlled by the switching control circuit 340.

[0088] Figure 7 This is a schematic diagram of the optimized structure of the single-fire power supply protection module in the embodiment of this application based on the built-in power supply optimization. Figure 7 In an embodiment of the present application, the built-in power supply circuit 310 may include:

[0089] The energy storage circuit 313 is connected to the power supply generating terminal of the built-in power supply circuit 310 for generating the internal DC voltage Vcc;

[0090] A voltage stabilizing circuit 314 connected to a power supply generating terminal of the built-in power supply circuit 310 for generating an internal DC voltage Vcc;

[0091] The rectifier circuit 315 is connected to the single-fire power supply protection module 30 for connecting the live wire terminal of the cascade live wire L_s_i and the neutral wire terminal for connecting the neutral wire N, and the rectifier circuit 315 has a current output terminal for generating a charging current;

[0092] The first current source 311 is connected between the current output terminal of the rectifier circuit 315 and the energy storage circuit 313, wherein the first current source 311 is normally enabled, that is, the first current source 311 can continue to work during the period of power-on startup of the single-fire power supply protection module 30;

[0093] The second current source 312 is connected in parallel with the first current source 311 between the current output end of the rectifier circuit 315 and the energy storage circuit 313, wherein the second current source 312 has a power enable end, and the power enable end is connected to the power generating end of the built-in power supply circuit 310 for generating an internal DC voltage Vcc, that is, the second current source 312 can be enabled and triggered by the internal DC voltage Vcc.

[0094] When the reference voltage V_ref is within the preset target voltage interval corresponding to the voltage zero point interval, the internal DC voltage Vcc triggers the power enable terminal of the second current source 312 to be enabled by the switching control circuit 340, so that the second current source 312 is started;

[0095] When the reference voltage V_ref is outside the preset target voltage interval corresponding to the voltage zero point interval, the internal DC voltage Vcc is interrupted and cancelled by the switching control circuit 340 to turn off the second current source 312 .

[0096] That is, when the reference voltage V_ref is within the preset target voltage interval corresponding to the voltage zero point interval, the built-in power supply circuit 310 can be in the first charging mode in which the first current source 311 and the second current source 312 are simultaneously started; when the reference voltage V_ref is outside the preset target voltage interval corresponding to the voltage zero point interval, the built-in power supply circuit 310 can be in the second charging mode in which only the first current source 311 is started. Moreover, the charging efficiency of the first charging mode is higher than the charging efficiency of the second charging mode.

[0097] Figure 8 This is a schematic diagram of the second example structure of the single-fire power supply protection module in the embodiment of this application. Figure 8 , the built-in power supply circuit 310 adopts Figure 7 In the case of the optimized structure shown:

[0098] The energy storage circuit 313 may include a module built-in capacitor C13 connected in series between a power supply generating terminal of the built-in power supply circuit 310 for generating an internal DC voltage Vcc and ground;

[0099] The voltage stabilizing circuit 314 may include a voltage stabilizing diode D13 connected inversely between a power supply generating terminal of the built-in power supply circuit 310 for generating the internal DC voltage Vcc and ground;

[0100] The rectifier circuit 315 may include a first rectifier tube D14 connected in series between the live wire terminal and the current output terminal, and a second rectifier tube D15 connected in series between the neutral wire terminal and the current output terminal;

[0101] The first current source 311 may include a first power supply internal resistor R11 and a first diode D11 connected in series between the current output terminal of the rectifier circuit 315 and the energy storage circuit 313 (ie, the module built-in capacitor C13);

[0102] The second current source 312 may include a second power supply internal resistor R12 , a first diode D12 , and a fifth switch tube T11 which are connected in series between the current output terminal of the rectifier circuit 315 and the energy storage circuit 313 .

[0103] Moreover, if Figure 7 As shown, the second current source 312 may further include a sixth switch tube T12, which is connected in series between the second power supply internal resistor R12 and the control end of the fifth switch tube T11, and the control end of the sixth switch tube T12 is connected to the power enable end of the second current source 312. For example, the fifth switch tube T11 and the sixth switch tube T12 may both include an NPN-type triode, the collector of the fifth switch tube T11 is connected to the current output end of the rectifier circuit 315 through the second power supply internal resistor R12, the emitter is connected to the energy storage circuit 313 (i.e., the module built-in capacitor C13) through the first diode D12, and the base is used as the control end, the collector of the sixth switch tube T12 is connected to the current output end of the rectifier circuit 315 through the second power supply internal resistor R12, the emitter is connected to the control end of the fifth switch tube T11, and the base is used as the control end to connect the power enable end of the second current source 312.

[0104] If the switching control circuit 340 includes the first switch tube T40 as described above, then:

[0105] When the reference voltage V_ref is within the preset target voltage interval corresponding to the voltage zero point interval, the first switch tube T40 is in the cut-off state, the internal driving voltage V_drv generated based on the internal DC voltage Vcc is applied to the power enable terminal of the second current source 312, and the fifth switch tube T11 and the sixth switch tube T12 are both in the on state so that the charging current generated by the current output terminal of the rectifier circuit 315 drives the second current source 312 to charge the energy storage circuit 313 (i.e., the module built-in capacitor C13), so that the start trigger of the internal DC voltage Vcc on the power enable terminal of the second current source 312 is enabled by the switching control circuit 340, so that the second current source 312 is started;

[0106] When the reference voltage V_ref is outside the preset target voltage interval corresponding to the voltage zero point interval, the first switch tube T40 is in the on state, the power enable terminal of the second current source 312 is set to the ground potential through the on-state first switch tube T40, and the fifth switch tube T11 and the sixth switch tube T12 are both in the off state, so that the start trigger of the internal DC voltage Vcc on the power enable terminal of the second current source 312 is interrupted and cancelled by the switching control circuit 340, so that the second current source 312 is turned off.

[0107] Fig. 9 This is a schematic diagram of the optimized structure of the single-fire power supply protection module in the embodiment of this application, which introduces a loop protection mechanism. Fig. 9 In an embodiment of the present application, the single-fire power supply protection module 30 may be further configured to have a circuit protection capability for implementing overcurrent protection. In this case, the single-fire power supply protection module 30 may also include:

[0108] The loop sampling circuit 350 is connected in series in the internal loop 300 of the single-fire power supply protection module 30 and has a sampling output terminal for generating sampling voltages V_sp1 and V_sp2, wherein the sampling voltages V_sp1 and V_sp2 change synchronously with the current value of the loop current in the internal loop 300 of the single-fire power supply protection module 30;

[0109] The loop protection circuit 360 is connected to the sampling output terminal of the loop sampling circuit 350 to generate the sampling voltages V_sp1 and V_sp2, and when the sampling voltage V_sp1 or V_sp2 is higher than or equal to the preset safety voltage threshold corresponding to the loop current threshold, the loop protection circuit 360 can forcibly interrupt the power supply of the internal DC voltage Vcc to the loop switch circuit 320, and the power supply of the internal DC voltage Vcc to the loop switch circuit 320 is separated from the control of the switching control circuit 340.

[0110] Fig.10 This is a schematic diagram of the third example structure of the single-fire power supply protection module in the embodiment of this application. Fig.10 In an embodiment of the present application, the loop protection circuit 360 may include a seventh switch tube T61 and an eighth switch tube T62, wherein the seventh switch tube T61 is connected in series between a power supply generating end of the built-in power supply circuit 310 for generating an internal DC voltage Vcc and the neutral line N, and the eighth switch tube T62 is connected in series between a power supply generating end of the built-in power supply circuit 310 for generating an internal DC voltage Vcc and the cascade live line L_s_i, and the control ends of the seventh switch tube T61 and the eighth switch tube T62 are connected to the sampling output end, and the threshold voltages of the seventh switch tube T61 and the eighth switch tube T62 may be equal to a preset safety voltage threshold corresponding to the loop current threshold.

[0111] When the sampling voltages V_sp1 and V_sp2 are lower than the preset safety voltage threshold corresponding to the loop current threshold, the seventh switch tube T61 and the eighth switch tube T62 are both in the cut-off state, and the power supply of the loop switch circuit 320 by the internal DC voltage Vcc is controlled by the switching control circuit 340 in the manner described above;

[0112] When the sampling voltage V_sp1 or V_sp2 is alternately higher than or equal to the preset safety voltage threshold of the corresponding loop current threshold, the seventh switch tube T61 and the eighth switch tube T62 are alternately in the on state in response to the change in the AC direction of the load voltage, so that the internal DC voltage Vcc is alternately grounded through the neutral line N or the cascade live line L_s_i, so that the power supply of the internal DC voltage Vcc to the loop switch circuit 320 is forcibly interrupted and is out of the control of the switching control circuit 340.

[0113] Fig.11 This is a schematic diagram of the optimal structure of the single-fire power supply protection module in the embodiment of the present application based on the built-in power supply optimization and the introduction of the loop protection mechanism. Fig.12 FIG. 4 is a schematic diagram of the structure of the fourth example of the single-fire power supply protection module in the embodiment of the present application. Fig.11 and Fig.12 As shown, in the case where the single-fire power supply protection module 30 in the embodiment of the present application includes a loop sampling circuit 350 and a loop protection circuit 360, the optimized structure of the built-in power supply circuit 310 described above is also applicable.

[0114] Also, please review Figure 6 , Figure 8 , Fig.10 as well as Fig.12 The single-fire power supply protection module 30 in the embodiment of the present application may also include an external protection circuit 370. In this case, the built-in power supply circuit 310, the loop switch circuit 320 and the reference generation circuit 330 are all connected to the live wire terminal and the neutral wire terminal through the external protection circuit 370. For example, the external protection circuit 370 may include a pair of current limiting resistors R71 and R72 respectively connected in series with the live wire terminal of the single-fire power supply protection module 30 for connecting the cascade live wire L_s_i and the neutral wire terminal for connecting the neutral wire N.

[0115] An embodiment of the present application also provides an intelligent lighting system, including the single-fire power supply protection module 30 in the aforementioned embodiment, a single-fire switch device 10 and a lamp 20, wherein the single-fire switch device 10 includes a power adapter 11, a control module 12 powered by the power adapter 11, and a switch built-in capacitor C10 connected in parallel at both ends of the control module 12, and the control switch (such as a relay) between the cascade live wire L_s_i and the input live wire L_in is controlled by the control module 12.

[0116] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A single - live - wire power - taking protection module, characterized in that, the single - live - wire power - taking protection module is used to be connected in parallel with a lamp, the lamp is connected in series between the neutral wire and the cascaded live wire led out from a single - live - wire switch device, the single - live - wire power - taking protection module has a live - wire terminal and a neutral - wire terminal for respectively connecting the cascaded live wire and the neutral wire at both ends of the lamp, and an internal circuit connected between the live - wire terminal and the neutral - wire terminal. And the single - live - wire power - taking protection module includes: a built - in power supply circuit, connected to the live - wire terminal and the neutral - wire terminal, and having a power - generating terminal for generating an internal DC voltage by using the load voltage across both ends of the lamp; a loop switch circuit, located in the internal circuit; a reference - voltage generating circuit, connected to the live - wire terminal and the neutral - wire terminal, and having a reference - voltage generating terminal for generating a reference voltage that synchronously changes with the absolute value of the load voltage; a switching control circuit, connected to the reference - voltage generating terminal, and: when the reference voltage is within a preset target voltage range corresponding to the voltage zero - point interval, the power supply of the internal DC voltage to the loop switch circuit is enabled by the switching control circuit, the internal circuit is conducted by the loop switch circuit that receives power supply, and the single - live - wire power - taking protection module bypasses the parallel - connected lamp when the internal circuit is conducted; when the reference voltage is outside the preset target voltage range, the power supply of the internal DC voltage to the loop switch circuit is interrupted and revoked by the switching control circuit, the internal circuit is disconnected by the loop switch circuit whose power supply is interrupted, and the single - live - wire power - taking protection module cancels the bypass of the lamp when the internal circuit is disconnected.

2. The single - live - wire power - taking protection module according to claim 1, characterized in that, the loop switch circuit has a circuit power - receiving terminal, and the circuit power - receiving terminal is connected to the power - generating terminal; the switching control circuit includes a first switching tube, the first switching tube is connected in series between the power - generating terminal and the ground, the control terminal of the first switching tube is connected to the reference - voltage generating terminal, and the preset target voltage range is determined by the threshold voltage of the first switching tube, where: when the reference voltage is within the preset target voltage range, the first switching tube is in an off state, and an internal driving voltage generated based on the internal DC voltage is applied to the circuit power - receiving terminal, so that the power supply of the internal DC voltage to the loop switch circuit is enabled; when the reference voltage is outside the preset target voltage range, the first switching tube is in a conducting state, and the circuit power - receiving terminal is set to the ground potential through the conducting first switching tube, so that the power supply of the internal DC voltage to the loop switch circuit is interrupted and revoked.

3. The single - live - wire power - taking protection module according to claim 2, characterized in that, The reference generation circuit includes a voltage dividing circuit. Wherein, two ends of the voltage dividing circuit are respectively connected to the live wire terminal and the neutral wire terminal, the circuit impedance of the voltage dividing circuit is greater than the load impedance of the lamp, the reference generation terminal is located at the voltage dividing node of the voltage dividing circuit, the reference voltage is the divided voltage of the load voltage at the voltage dividing node, and the voltage zero point interval is determined based on the threshold voltage of the first switching tube and the voltage dividing ratio at the voltage dividing node.

4. The single-phase power supply protection module according to claim 1, characterized in that the loop switch circuit includes a second switching tube, a third switching tube and a fourth switching tube. The second switching tube is connected in series in the internal loop. The third switching tube is connected in series between the power receiving end of the loop switch circuit and the control end of the second switching tube. The fourth switching tube is connected in series between the control end of the second switching tube and the ground. The control ends of the third switching tube and the fourth switching tube are both connected to the power receiving end, and the power receiving end is connected to the power generation end, where: When the power supply of the internal DC voltage to the loop switch circuit is enabled by the switching control circuit, the internal driving voltage generated based on the internal DC voltage is applied to the power receiving end, so that the third switching tube is in the conducting state, the fourth switching tube is in the cut-off state, and the control end of the second switching tube is clamped at the internal driving voltage through the conducting third switching tube, so that the second switching tube is in the conducting state of conducting the internal loop; When the power supply of the internal DC voltage to the loop switch circuit is interrupted and revoked by the switching control circuit, the control ends of the third switching tube and the fourth switching tube are set to the ground potential through the grounded power receiving end, so that the third switching tube is in the cut-off state, the fourth switching tube is in the conducting state, and the control end of the second switching tube is clamped at the ground potential through the conducting fourth switching tube, so that the second switching tube is in the cut-off state of disconnecting the internal loop.

5. The single-phase power supply protection module according to claim 4, characterized in that the second switching tube includes a pair of switching tubes respectively close to the live wire terminal and the neutral wire terminal; and / or the power receiving end is connected to the power generation end through a pull-up resistor, and the internal driving voltage has a voltage value obtained by stepping down the internal DC voltage based on the pull-up resistor; and / or the loop switch circuit further includes a step-down resistor connected in series between the control ends of the third switching tube and the fourth switching tube and the power receiving end. The switching control voltage obtained by stepping down the internal driving voltage through the step-down resistor is applied to the control ends of the third switching tube and the fourth switching tube, and the switching control voltage causes the third switching tube to be in the conducting state and the fourth switching tube to be in the cut-off state.

6. The single-phase power supply protection module according to claim 1, characterized in that the built-in power supply circuit includes: Energy storage circuit, connected to the power generation terminal; Voltage stabilizing circuit, connected to the power generation terminal; Rectifying circuit, connected to the live wire terminal and the neutral wire terminal, and having a current output terminal for generating a charging current; First current source, connected between the current output terminal and the energy storage circuit, wherein the first current source is normally enabled; Second current source, connected in parallel with the first current source between the current output terminal and the energy storage circuit, wherein the second current source has a power enable terminal, the power enable terminal is connected to the power generation terminal, and: When the reference voltage is within the preset target voltage range, the start trigger of the internal DC voltage on the power enable terminal is enabled by the switching control circuit, so that the second current source starts; When the reference voltage is outside the preset target voltage range, the start trigger of the internal DC voltage on the power enable terminal is interrupted and canceled by the switching control circuit, so that the second current source is turned off.

7. The single-phase power extraction protection module according to claim 6, characterized in that the first current source includes a first power supply internal resistance connected in series between the current output terminal and the energy storage circuit; and / or the second current source includes a second power supply internal resistance and a fifth switching tube connected in series between the current output terminal and the energy storage circuit, the second current source further includes a sixth switching tube, the sixth switching tube is connected in series between the second power supply internal resistance and the control terminal of the fifth switching tube, and the control terminal of the sixth switching tube is connected to the power enable terminal, wherein: when the reference voltage is within the preset target voltage range, the internal drive voltage generated based on the internal DC voltage is applied to the power enable terminal, and both the fifth switching tube and the sixth switching tube are in the conducting state, so that the start trigger of the internal DC voltage on the power enable terminal is enabled; when the reference voltage is outside the preset target voltage range, the power enable terminal is set to the ground potential through the conducting first switching tube, and both the fifth switching tube and the sixth switching tube are in the cut-off state, so that the start trigger of the internal DC voltage on the power enable terminal is interrupted and canceled; and / or the switching control circuit includes a first switching tube, the first switching tube is connected in series between the power generation terminal and the ground, and the control terminal of the first switching tube is connected to the reference generation terminal, wherein: when the reference voltage is within the preset target voltage range, the first switching tube is in the cut-off state, and the internal drive voltage generated based on the internal DC voltage is applied to the power enable terminal, so that the start trigger of the internal DC voltage on the power enable terminal is enabled; when the reference voltage is outside the preset target voltage range, the first switching tube is in the conducting state, and the power enable terminal is set to the ground potential through the conducting first switching tube, so that the start trigger of the internal DC voltage on the power enable terminal is interrupted and canceled.

8. The single - live - wire power - taking protection module according to claim 1, characterized in that, the single - live - wire power - taking protection module further includes: a loop sampling circuit, which is connected in series in the internal loop and has a sampling output terminal for generating a sampling voltage, wherein the sampling voltage changes synchronously with the current value of the loop current in the internal loop; a loop protection circuit, including a seventh switching tube and an eighth switching tube, the seventh switching tube is connected in series between the power - generation terminal and the neutral line, the eighth switching tube is connected in series between the power - generation terminal and the cascaded live wire, and the control terminals of the seventh switching tube and the eighth switching tube are connected to the sampling output terminal, wherein: when the sampling voltage is lower than a preset safe - voltage threshold, both the seventh switching tube and the eighth switching tube are in the cut - off state, and the power supply of the internal DC voltage to the power supply of the loop switching circuit is controlled by the switching control circuit; when the sampling voltage is higher than or equal to the preset safe - voltage threshold, the seventh switching tube and the eighth switching tube are alternately in the conducting state in response to the change in the AC direction of the load voltage, so as to alternately ground the internal DC voltage through the neutral line or the cascaded live wire, so that the power supply of the internal DC voltage to the power supply of the loop switching circuit is separated from the control of the switching control circuit and is forcibly interrupted.

9. The single - live - wire power - taking protection module according to claim 8, characterized in that, the sampling output terminal of the loop sampling circuit includes a first sampling output terminal and a second sampling output terminal located in the internal loop, and a ground reference terminal located between the first sampling output terminal and the second sampling output terminal. The loop sampling circuit includes a first sampling resistor connected in series between the first sampling output terminal and the ground reference terminal, and a second sampling resistor connected in series between the second sampling output terminal and the ground reference terminal. The first sampling output terminal is connected to the control terminal of the seventh switching tube, and the second sampling output terminal is connected to the control terminal of the eighth switching tube.

10. The single - live - wire power - taking protection module according to claim 1, characterized in that, the built - in power supply circuit generates the internal DC voltage by storing energy from the load voltage; and / or, the reference - voltage generation circuit includes a voltage - dividing circuit, wherein the two ends of the voltage - dividing circuit are respectively connected to the live - wire connection terminal and the neutral - line connection terminal, the circuit impedance of the voltage - dividing circuit is greater than the load impedance of the lamp, and the reference - voltage generation terminal is located at the voltage - dividing node of the voltage - dividing circuit, and the reference voltage is the voltage divided by the load voltage at the voltage - dividing node; and / or, The single - live - wire power - taking protection module further includes: a loop sampling circuit, which is connected in series in the internal loop and has a sampling output terminal for generating a sampling voltage, wherein the sampling voltage changes synchronously with the current value of the loop current in the internal loop; and a loop protection circuit, which is connected to the sampling output terminal of the loop sampling circuit. When the sampling voltage is higher than or equal to the preset safety voltage threshold, the loop protection circuit forcibly interrupts the power supply of the internal DC voltage to the power supply of the loop switch circuit, and the power supply of the internal DC voltage to the power supply of the loop switch circuit is separated from the control of the switching control circuit; and / or, The single - live - wire power - taking protection module further includes an external protection circuit. The built - in power supply circuit, the loop switch circuit and the reference generation circuit are all connected to the live - wire terminal and the neutral - wire terminal through the external protection circuit. The external protection circuit includes a pair of current - limiting resistors connected in series with the live - wire terminal and the neutral - wire terminal respectively.

11. An intelligent lighting system, characterized in that, it includes the single - live - wire power - taking protection module according to any one of claims 1 to 10, the single - live - wire switch device and the lamp. The single - live - wire switch device includes a power adapter, a control module powered by the power adapter, and a switch - built - in capacitor connected in parallel across the control module. The control switch between the cascaded live - wire and the input live - wire is controlled by the control module.

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