Ultrathin marker lamp

Abstract

An ultrathin marker lamp comprises a shell (1), a light guide plate (2) and a circuit board (3), the light guide plate (2) and the circuit board (3) are arranged in the shell (1), a light-emitting position (4) and a board placing position (5) are arranged in the shell (1), the light guide plate (2) is arranged in the light-emitting position (4), the circuit board (3) is arranged in the board placing position (5), and the width of the section of the light-emitting position (4) and the width of the section of the shell (1) are smaller than the width of the section of the board placing position (5) and the width of the section of the shell (1). The light guide plate (2) is placed through the light-emitting position (4), the circuit board (3) is placed through the board placing position (5), and the section width of the light-emitting position (4) and the shell (1) is matched with the thickness of the light guide plate (2), so that the thickness of the shell (1) is not related to the thickness of the light guide plate (2) any more.

Description

An ultra-thin marker light Technical Field

[0001] The present invention relates to the technical field of lamps, and in particular to an ultra-thin marker lamp. Background Art

[0002] Light guide plates have been widely used in fire emergency sign lamps because they can better utilize the light efficiency of LED light sources and have excellent light guiding performance. With the rapid development of the emergency lighting industry, ultra-thin sign lights have become popular in the market because of their simplicity and safety.

[0003] The thickness of the ultra-thin marker light is determined by the thickness of the light guide plate and the circuit board. The thinner the light guide plate and the circuit board are, the thinner the lamp body is and the more popular it is with users. In addition, the volume of the lamp body is smaller and the cost of the lamp is reduced accordingly. However, due to the size limitation of the electronic components on the circuit board, in order to place the circuit board, the thickness of the lamp body must be adapted to the thickness of the circuit board. However, due to the structural limitations of existing lamps, a light guide plate thinner than the circuit board cannot be installed.

[0004] Summary of the Invention

[0005] One of the purposes of the present invention is to provide an ultra-thin marker light with a simple structure and capable of installing a light guide plate thinner than a circuit board.

[0006] In order to achieve the above-mentioned purpose, the present invention provides an ultra-thin marker light, comprising a shell, a light guide plate and a circuit board arranged in the shell, wherein the shell is provided with a light-emitting position and a board placement position, the light guide plate is arranged in the light-emitting position, the circuit board is arranged in the board placement position, and the cross-sectional width of the light-emitting position and the shell is smaller than the width of the board placement position and the shell.

[0007] Preferably, the light-emitting position is adapted to the cross-sectional width of the housing and the thickness of the light guide plate.

[0008] Preferably, the shell is provided with an inwardly recessed support portion, the support portion is arranged in the light-emitting position, and the cross-sectional width between the support portion and the shell is smaller than the width of the board placement position.

[0009] Preferably, the board placement position is arranged at the edge of the light-emitting position, and the circuit board is arranged at the edge of the light guide plate.

[0010] Preferably, the board placement position is arranged in the middle of the light-emitting position, and the circuit board is arranged in the middle of the light guide plate.

[0011] Preferably, an LED light source is provided on the circuit board, and the light guide plate is optically connected to the LED light source.

[0012] Preferably, the shell includes a first shell and a second shell, and the first shell and / or the second shell is provided with a marking hole, and the position of the marking hole is adapted to the position of the light-emitting position.

[0013] Preferably, the support is provided on the first shell and / or the second shell.

[0014] Preferably, a battery is provided in the shell, the shell is provided with a battery position, the cross-sectional width of the battery position is greater than the cross-sectional width of the light-emitting position, and the battery is arranged in the battery position.

[0015] Preferably, components are provided on the circuit board, and the components are arranged in the board placement position.

[0016] Preferably, the four edges of the shell are edge portions, the cross-sectional width of the edge portions is greater than the cross-sectional widths of the light-emitting position and the shell, and the edge portions surround the light-emitting position.

[0017] Compared with the prior art, the beneficial effects of the present invention are: by placing the light guide plate at the light-emitting position and the circuit board at the board position, the cross-sectional width of the light-emitting position and the shell is adapted to the thickness of the light guide plate, and the thickness of the shell is no longer related to the thickness of the light guide plate. While the circuit board can be installed, even a thinner light guide plate can be installed in the shell, which can greatly improve the installation diversity of the light guide plate and effectively save product costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a perspective view of the first embodiment.

[0019] FIG2 is an exploded perspective view of the first embodiment.

[0020] FIG. 3 is an enlarged cross-sectional view taken along line AA in FIG. 1 .

[0021] FIG4 is a perspective view of the second embodiment.

[0022] FIG5 is an exploded perspective view of the second embodiment.

[0023] FIG. 6 is an enlarged cross-sectional view taken along line BB in FIG. 4 .

[0024] FIG7 is a perspective view of the third embodiment.

[0025] FIG8 is an exploded perspective view of the third embodiment.

[0026] FIG. 9 is an enlarged cross-sectional view taken along line CC in FIG. 7 .

[0027] FIG10 shows a schematic diagram of a feeding topology according to an embodiment of the present invention;

[0028] Figure 11 is a block diagram of the voltage-stabilizing circuit at the input end of a lamp according to one embodiment of the present invention. 1 - Housing; 11 - First housing; 12 - Second housing; 13 - Marking hole; 14 - Support; 15 - Battery compartment; 2 - Light guide plate; 3 - Circuit board; 31 - LED light source; 32 - Components; 4 - Lighting area; 5 - Board placement area; 6 - Edge; 7 - Battery. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described below with reference to specific embodiments.

[0030] Example 1

[0031] As shown in Figures 1, 2, and 3, an ultra-thin marker light comprises a housing 1, a light guide plate 2 disposed within the housing 1, and a circuit board 3. The housing 1 is provided with a light-emitting position 4 and a circuit board placement position 5. The light guide plate 2 is disposed within the light-emitting position 4, and the circuit board 3 is disposed within the circuit board placement position 5. The cross-sectional width of the light-emitting position 4 and the housing 1 is smaller than the width of the circuit board placement position 5 and the housing 1. The cross-sectional width of the light-emitting position 4 and the housing 1 is adapted to the thickness of the light guide plate 2. The circuit board placement position 5 is disposed at the edge of the light-emitting position 4, and the circuit board 3 is disposed at the edge of the light guide plate 2. An LED light source 31 is disposed on the circuit board 3, and the light guide plate 2 is optically connected to the LED light source 31.

[0032] The shell 1 includes a first shell 11 and a second shell 12. The first shell 11 and the second shell 12 are provided with a marking hole 13. The position of the marking hole 13 is adapted to the position of the light-emitting position 4. The light guide plate 2 is placed through the light-emitting position 4, and the circuit board 3 is placed on the board position 5. The light-emitting position 4 is adapted to the cross-sectional width of the shell 1 and the thickness of the light guide plate 2. The thickness of the shell 1 is no longer related to the thickness of the light guide plate 2. A thicker circuit board 3 can be installed at the same time, and even a thinner light guide plate 2 can be installed in the shell 1, which can greatly improve the installation diversity of the light guide plate 2 and effectively save product costs.

[0033] Example 2

[0034] As shown in Figures 4, 5 and 6, an ultra-thin marker light comprises a shell 1, a light guide plate 2 and a circuit board 3 arranged in the shell 1, a light-emitting position 4 and a board placement position 5 being provided in the shell 1, the light guide plate 2 being provided in the light-emitting position 4, the circuit board 3 being provided in the board placement position 5, the cross-sectional width of the light-emitting position 4 and the shell 1 being smaller than the width of the board placement position 5 and the shell 1, the cross-sectional width of the light-emitting position 4 and the shell 1 being adapted to the thickness of the light guide plate 2, the shell 1 being provided with an inwardly recessed support 14, the support 14 being provided in the light-emitting position 4, the cross-sectional width between the support 14 and the shell 1 being smaller than the width of the board placement position 5, the light guide plate 1 being tightly attached to the front shell 1 through the support 14, the board placement position 5 being provided in the middle of the light-emitting position 4, the circuit board being provided in the middle of the light guide plate, an LED light source 31 being provided on the circuit board 3, and the light guide plate 2 being optically connected to the LED light source 31.

[0035] The housing 1 is provided with a battery 7 , which is provided with a battery position 15 . The cross-sectional width of the housing 1 and the battery position 15 is greater than the cross-sectional width of the housing 1 and the light-emitting position 4 . The battery 7 is provided in the battery position 15 .

[0036] The shell 1 includes a first shell 11 and a second shell 12. The first shell 11 is provided with a marking hole 13. The position of the marking hole 13 is adapted to the position of the light-emitting position 4. The light guide plate 2 is placed through the light-emitting position 4, and the circuit board 3 is placed on the board position 5. The light-emitting position 4 is adapted to the cross-sectional width of the shell 1 and the thickness of the light guide plate 2. The thickness of the shell 1 is no longer related to the thickness of the light guide plate 2. A thicker circuit board 3 can be installed at the same time, and even a thinner light guide plate 2 can be installed in the shell 1, which can greatly improve the installation diversity of the light guide plate 2 and effectively save product costs.

[0037] Example 3

[0038] As shown in Figures 7, 8 and 9, an ultra-thin marker light includes a shell 1, a light guide plate 2 and a circuit board 3 arranged in the shell 1, a light-emitting position 4 and a board placement position 5 are provided in the shell 1, the light guide plate 2 is arranged in the light-emitting position 4, the circuit board 3 is arranged in the board placement position 5, the cross-sectional width of the light-emitting position 4 and the shell 1 is smaller than the width of the board placement position 5 and the shell 1, the cross-sectional width of the light-emitting position 4 and the shell 1 and the thickness of the light guide plate 2 are adapted, the board placement position 5 is arranged in the middle of the light-emitting position 4, the circuit board is arranged in the middle of the light guide plate, an LED light source 31 is provided on the circuit board 3, and the light guide plate 2 is optically connected to the LED light source 31.

[0039] The shell 1 includes a first shell 11 and a second shell 12. The first shell 11 and the second shell 12 are both provided with a marking hole 13. The position of the marking hole 13 is adapted to the position of the light-emitting position 4. The light guide plate 2 is placed through the light-emitting position 4, and the circuit board 3 is placed on the board position 5. The light-emitting position 4 is adapted to the cross-sectional width of the shell 1 and the thickness of the light guide plate 2. The thickness of the shell 1 is no longer related to the thickness of the light guide plate 2. A thicker circuit board 3 can be installed, and even a thinner light guide plate 2 can be installed in the shell 1. This can greatly improve the installation diversity of the light guide plate 2 and effectively save product costs.

[0040] The four edges of the shell 1 are edge portions 6, and the cross-sectional width of the edge portion 6 is greater than the cross-sectional width of the light-emitting position 4 and the shell 1. The edge portion 6 surrounds the light-emitting position 4. Most existing shells 1 are assembled by snapping together. The edge portion 6 can ensure that there is enough space on the side of the shell 1 to set the snapping mechanism, making the assembly of the lamp more convenient. It should be noted that snapping is not the only assembly method of the shell 1. The shell 1 can be assembled by gluing or screwing. When gluing or screwing is used, the shell 1 may not be provided with the edge portion 6.

[0041] The circuit board 3 is provided with components 32, and the components 32 are arranged in the board placement position 5; it should be noted that: due to the reasons of electronic component manufacturing technology, the overall thickness of the circuit board 3 is determined by the thickness of the components 32, and the LED light source 31 on the circuit board 3 is based on the current LED light source 31 production process, and the size of the LED light source 31 can be made extremely small, so when the part of the circuit board 3 where the LED light source 31 is arranged is set in the light-emitting position 4 and connected to the light guide plate 2, and the part where the components 32 are arranged is set in the board placement position 5, this structure can also be used, which should be within the protection scope of the present invention.

[0042] Emergency lighting, as an important safety facility, is powered by a connected host, which is an emergency lighting controller, emergency power supply box, or emergency distribution box. Changes in the output power of the host may cause electrical appliances to flicker, which will be detrimental to fire emergency lighting.

[0043] In order to solve this problem, in some embodiments of the present application, an energy storage device is connected inside the host or on the light source board of the fire emergency lighting fixture powered by the host as an electric energy buffer unit, so that when the power supply provided by the host fluctuates, the electric energy supply to the light source board in the fire emergency lighting fixture can be kept stable, so that the luminous power of the light source board is basically constant.

[0044] Based on this concept, the emergency lighting fixtures (or lamps, ultra-thin sign lights) in some embodiments of the present application also include the above-mentioned energy storage device. And the lamps (ultra-thin sign lights) in any embodiment of the present application may also include: a power supply board and an energy storage device, the energy storage device is provided on the power supply board, electrically connected to the light source board, and is used to connect to the power from the battery assembly; the energy storage device further includes:

[0045] a plurality of electricity storage components, each of which includes an anode and a cathode;

[0046] a second power storage assembly; and

[0047] One or more switch units, wherein the one or more switch units include at least two or more poles, and wherein:

[0048] In the high-level mode of the one or more switching units, the first power storage component and the second power storage component are coupled in series, and

[0049] In the low-level mode of the one or more switching units, the first energy storage component and the second energy storage component are coupled in parallel.

[0050] Optionally, in one embodiment of the present application:

[0051] The one or more switch units include a first single-pole double-throw switch and a second single-pole double-throw (also known as single-pole double-throw) switch;

[0052] In the high level mode, the first single-pole double-throw switch and the second single-pole double-throw switch are both in the first switch position, thereby connecting the anode of the first storage assembly to the cathode of the second storage assembly; and

[0053] In low-level mode:

[0054] The first single-pole double-throw switch is in a second switch position, thereby connecting the cathode of the first electrical storage assembly to the cathode of the second electrical storage assembly; and

[0055] The second single-pole double-throw switch is in a second switch position, thereby connecting the anode of the first energy storage assembly to the anode of the second energy storage assembly.

[0056] Optionally, in one embodiment of the present application:

[0057] The one or more switch units include two single-pole single-throw switches;

[0058] In high-level mode:

[0059] The first of the two single-pole, single-throw switches is in the open position, and

[0060] a second of the two single-pole, single-throw switches in an engaged, energized position, thereby connecting the anode of the first electrical storage assembly to the cathode of the second electrical storage assembly; and

[0061] In low-level mode:

[0062] A first of the two single-pole, single-throw switches is in an engaged, energized position, thereby connecting the cathode of the first electrical storage assembly to the cathode of the second electrical storage assembly, and

[0063] The second of the two single-pole, single-throw switches is in the open position.

[0064] Optionally, in one embodiment of the present application, the energy storage device further includes at least one charging unit switch, and the at least one charging unit switch is configured to connect the first storage component and the second storage component to the charging unit and disconnect them from the charging unit.

[0065] Optionally, in a lamp of an embodiment of the present application, in high level mode:

[0066] The anode of the light source panel is connected to the anode of the first power storage assembly; and

[0067] The cathode of the light source panel is connected to the cathode of the first power storage assembly.

[0068] Optionally, in one embodiment of the present application, the energy storage device further includes at least one load switch, and the at least one load switch includes at least two or more poles, wherein, in the high level mode:

[0069] When the at least one load switch is set to one or more first switch positions:

[0070] The anode of the light source panel is connected to the anode of the first power storage assembly, and

[0071] The cathode of the light source board is connected to the cathode of the first power storage assembly; and when the at least one load switch is set to one or more second switch positions:

[0072] The anode of the light source panel is connected to the anode of the second power storage assembly, and

[0073] The cathode of the light source panel is connected to the cathode of the first power storage assembly.

[0074] Optionally, in one embodiment of the present application, a control circuit is further included, which is configured to set the position of the at least one load switch according to the state parameters of at least one of the first storage component and the second storage component when in high-level mode.

[0075] Optionally, in one embodiment of the present application:

[0076] In the high-level mode, the energy storage device is configured to receive a charging voltage of 220 volts or 240 volts or more but not less than 800 volts.

[0077] Optionally, in one embodiment of the present application, in the charging configuration, the energy storage device is configured to provide a voltage of 48 volts or above 36 volts to the fire emergency lighting fixture or the light source panel.

[0078] Optionally, the lamp of an embodiment of the present application further includes an energy storage control unit, which is configured to select between a low-level mode and a high-level mode.

[0079] In these corresponding embodiments, the electrical connection between the energy storage device and the external power supply is dynamically adjusted in response to changes in the external power supply voltage, and / or the electrical connection between the energy storage device and the light source board is dynamically adjusted in response to changes in the external power supply voltage. Thus, through the central energy storage device, a stable power feed channel is established between an external power source such as a battery and the light source board, thereby maintaining a substantially constant optical power of the light source board in the fire emergency lighting fixture.

[0080] For example, in some embodiments, a) the electrical connection relationship between the energy storage device and the light source board is dynamically switched between series and parallel through the coordinated operation of the switching unit, or b) the electrical connection relationship between the entire energy storage device and the external power supply is dynamically switched between series and parallel through the coordinated operation of the switching unit, which enables the feeding channel of "external power supply→energy storage device" and / or the feeding channel of "energy storage device→light source board" to dynamically adapt to the voltage changes of the external power supply, thereby keeping the electric energy obtained by the light source board of the terminal stable.

[0081] Optionally, the lamps of some embodiments may be connected to a voltage stabilizing circuit at the output end, thereby further providing more stable electrical energy, such as voltage, to external lamps.

[0082] Therefore, in one embodiment, in some embodiments of the present application, a voltage stabilizing circuit is also proposed, including:

[0083] a linear DC voltage regulator unit configured to receive an input voltage through an input terminal of the transistor and provide a regulated output voltage at an output terminal of the transistor;

[0084] a DC-DC converter configured to output a DC-DC converter voltage, wherein the DC-DC converter voltage supplies power to a driving circuit of the linear DC voltage stabilization unit;

[0085] a DC-DC converter control circuit configured to control the DC-DC converter so that the DC-DC converter voltage (i) is greater than the input voltage and (ii) does not exceed a high voltage threshold; and

[0086] The undervoltage lockout unit is configured to enable the linear DC voltage regulator unit once the DC-DC converter voltage (i) is greater than the minimum voltage for operation of the linear DC voltage regulator unit and (ii) is greater than the regulated output voltage.

[0087] Optionally, in the above-mentioned voltage stabilization circuit, the transistor is an N-channel MOSFET controlled by the driving circuit; and the linear DC voltage stabilization unit is a low voltage dropout regulator.

[0088] Optionally, the above voltage stabilizing circuit, wherein:

[0089] The minimum voltage corresponds to a potential difference between the gate terminal and the source terminal of the N-channel MOSFET, so as to provide a non-zero output current to the output terminal of the linear DC voltage regulator unit; and

[0090] The high voltage threshold corresponds to the safe operating area of ​​the N-channel MOSFET.

[0091] Optionally, in the above voltage stabilizing circuit, the DC-DC converter is a symmetrical cross-coupled symmetrical DC-DC converter.

[0092] Optionally, in the above voltage stabilizing circuit, the DC-DC converter voltage corresponds to the frequency of a clock signal from the DC-DC converter control circuit.

[0093] Optionally, in the above-mentioned voltage stabilizing circuit, the frequency of the clock signal is controlled by a voltage controlled oscillator driven by a differential amplifier unit of a control circuit of the DC-DC converter; and

[0094] The differential amplifier unit is a four-input operational amplifier. Once the DC-DC converter voltage is lower than the high-voltage threshold, the output of the four-input operational amplifier is a floating voltage that is higher than the input voltage by a predetermined value. The predetermined value is determined by the operating characteristics of the transistor of the linear DC voltage regulator unit.

[0095] The lamp in some embodiments of the present application includes the power storage component in some of the above embodiments, which is connected to the power input terminal of the lamp.

[0096] Figure 10 shows a macroscopic schematic diagram of the electrical connection topology C311 between the storage components 210 and 211, electrical components, and sub-components according to some embodiments of the present application, and between the storage components and the light source panel. Each of the storage components 210 and 211 includes an anode connection terminal and a cathode connection terminal. For example, the storage component 210 has an anode connection terminal connected to the busbar 234 and a cathode connection terminal connected to the busbar B341. In addition, the storage component 211 has an anode connection terminal connected to the busbar B343 and a cathode connection terminal connected to the switch ONOFF361.

[0097] As shown in Figure 10, switches ONOFF361, ONOFF362, ONOFF365, and ONOFF367 are single-pole double throw (SPDT). For example, any one or all of switches ONOFF361, ONOFF362, ONOFF365, and ONOFF367 can be "ON-ON" or "ON-OFF-ON" types of single-pole double throw switches. Any one or all of switches ONOFF361, ONOFF362, ONOFF365, and ONOFF367 can include one or more contactors, relays, or transistors. For example, switches ONOFF361, ONOFF362, ONOFF365, and ONOFF367 can all be single-pole double throw contactors. In another embodiment, switches ONOFF361, ONOFF362, ONOFF365, and ONOFF367 can all include two single-pole single throw (SPST) contactors that are appropriately wired to achieve single-pole double throw connectivity. As shown in Figure 10, switches ONOFF371 and ONOFF373 ​​are both single-pole, single-throw switches configured to connect and disconnect corresponding terminals of battery charging unit EU381 from busbars B341 and B343. Either or both of switches ONOFF371 and ONOFF373 ​​may include contactors, relays, or transistors.

[0098] As shown in FIG10 , the storage components 210 and 211 are coupled in series. For example, the switches ONOFF361 and ONOFF362 are configured to connect the anode connection terminal of the storage component 210 to the cathode connection terminal of the storage component 211. The light source board 31 of the emergency lighting fixture is shown as being connected to the storage component 210 via the switches ONOFF367 and ONOFF365. As shown in FIG10 , the switch ONOFF367 connects the bus bar B341 to the cathode connection terminal of the light source board 31, while the switch ONOFF365 connects the bus bar 234 to the anode connection terminal of the light source board 31.

[0099] In some embodiments, the storage component 210 may also be referred to as a battery cell and may further include modules 313, 315, 317, and 319. In some embodiments, the storage component 211 may also include submodules 203, 205, 207, and 209, which may also be referred to as battery cells. For example, the storage component 210 may be referred to as a "string of battery cells" (i.e., battery cells coupled in series). The voltage of the storage component 210 may be a combination of battery cells 313, 315, 317, and 319. For example, as schematically shown in Figure 10, the voltage of the storage component 210 is the sum of the voltages of each of the battery cells 313, 315, 317, and 319. In another embodiment, the storage component (e.g., the storage component 210 or the storage component 211) may include one or more battery cells coupled in parallel (e.g., to increase the current capacity of the storage component). For clarity, the present application is described based on the storage component.

[0100] For simplicity, topology C311 illustrates two storage components, but according to the present application, more than two storage components can be managed. For example, three storage components that operate at 220V can be connected using a switch configuration in parallel (e.g., charging at 110V) or in series (e.g., charging at 220, 240 volts). In another embodiment, three storage components that each operate at 220 volts can be configured in parallel (i.e., in parallel) (e.g., charging at 220 volts), or two of the three can be configured in parallel and then connected in series with the third (e.g., charging at 220V, 240 volts). According to the present application, any suitable number of storage components can be managed (e.g., coupled in series or in parallel with a switch configuration). It will be understood that the storage component can include one or more submodules (e.g., separate submodules that can be coupled together to form a module).

[0101] FIG11 shows a block diagram of a voltage stabilization circuit 555 according to an embodiment of the present application. The circuit 555 can be configured to receive an input voltage (V IN ) and ground voltage (GND). The circuit 555 can be configured to transmit (eg, output) an output voltage (V OUT The output voltage is regulated so that changes in the input voltage (e.g., fluctuations) are not reflected in the output voltage. The output voltage is lower than the input voltage by a voltage difference.

[0102] The circuit 555 includes a linear DC voltage regulator unit (eg, a linear DC voltage regulator unit) 110, which is configured to provide a DC voltage regulator within a small voltage difference (eg, V D0 Less than or equal to 100mV) will output voltage (V OUT ) is regulated to be less than the input voltage (V jN)oThe power dissipated by the linear DC voltage regulator unit 666 during the regulation period. The power dissipated is related to the voltage difference (V DO ). Therefore, reducing V DO This reduces regulation losses and lowers cooling requirements.

[0103] FIG11 shows a block diagram of the linear DC voltage regulator unit 666. The linear DC voltage regulator unit 666 includes a transistor 111. The transistor 111 can be implemented using a variety of transistor types, such as BJT, MOSFET, JFET, etc. For example, the transistor 111 can be an N-channel MOSFET or a P-channel MOSFET. In fact, the N-channel MOSFET linear DC voltage regulator unit can provide advantages over other types of transistors. For example, the N-channel MOSFET linear DC voltage regulator unit can provide a lower voltage difference (e.g., V) than the P-channel MOSFET linear DC voltage regulator unit. DO ).

[0104] Regulation can be achieved by controlling the voltage drop across the transistor 111. For example, the voltage drop between the drain terminal (D) 112 and the source terminal (S) 113 of a N-channel MOSFET can be adjusted by the voltage applied to the gate terminal (G) 114 of an N-channel MOSFET.

[0105] The linear DC voltage regulator unit 666 includes a driving circuit (e.g., a driving circuit) 115 to provide a voltage at the gate terminal 114 of the transistor 111. The driving circuit 115 can be configured to receive the output voltage (V OUT The driving circuit 115 can also be configured to accept a reference voltage (V REF Once enabled, the driver circuit can be used as a voltage source with a voltage based on the difference between the reference voltage and the output voltage (e.g., V REF -V OUT ) output voltage (V G ) differential amplifier unit. The output voltage of the driving circuit is V G A voltage may be applied to the gate 114 of the transistor 111 to control the operating point of the transistor (eg, its conduction, its voltage drop (V DO )wait).

[0106] The driving circuit 115 passes a high voltage (V CHP ) (eg: high rail) and low voltage (GND) (eg: low rail) for power supply to operate. The low voltage (GND) of the driving circuit can also be V IN That is, the linear DC voltage regulator unit and the input voltage share the same voltage range. In order to provide sufficient control of transistor 111, V CHp Can be greater than the input voltage V INFor example, when the input voltage V IN is 1 volt (eg, at the drain terminal 112) and the voltage difference is 0.1 V (ie, V IN =1V,V DO =0.1V), the voltage at the output port of the transistor device (eg, the source terminal 113) may be 0.9V (eg, V OUT =0.9V). To turn on the transistor device 111 (eg, operate in the on state), the voltage at the output port of the driver circuit 115 may be at least 0.9V plus the threshold voltage (V T ). For a threshold voltage of 0.7V (for example: T =0.7), the drive circuit outputs a voltage of at least 1.6V (for example: V G ≥1.6V). Therefore, the driving circuit can be powered by a high voltage that enables the driving circuit to output at least 1.6V. Therefore, in the embodiment of the linear DC voltage regulator unit 666, the high voltage provided to the driving circuit 115 is set to be greater than the input voltage (i.e., V CHP >V IN ). is set as greater than all expected input voltages (V IN ) of a single value of high voltage (V CHP ) can be inefficient (e.g. once V IN The circuit and method of the present application provide a circuit based on the input voltage (V IN ) upper limit value (V CHP ) in order to provide effective work.

[0107] The driver circuit 115 can be enabled for operation via an enable signal EN. The enable signal EN can be a digital signal, a low voltage of which disables the operation of the driver circuit 115, and a high voltage of which enables the operation of the driver circuit 115. In a scenario where the voltage drops below a desired target, desired threshold, the enable signal can be used to shut down the linear DC regulator unit 666. This control can be used to protect (e.g., a device coupled to the circuit 555). The circuit of the present application advantageously utilizes multiple criteria to determine the state of the enable signal EN.

[0108] Returning to FIG. 11 , the circuit 555 further includes a DC-DC converter 888 and a DC-DC converter control circuit 999 to generate a high voltage V CHP , and the under-voltage lockout unit 120 to generate an enable signal EN.

[0109] An example of a DC-DC converter circuit is shown in FIG11 . The exemplary DC-DC converter shown is provided to aid understanding and is not intended as a limiting example for this application. The circuits and methods disclosed herein can be used in conjunction with other DC-DC converter types and architectures. In this application, a DC-DC converter circuit similar to that shown in FIG11 is described. However, the DC-DC converter circuit includes input switches and output switches that are individually controlled by different clock signals, as an alternative to coupling a storage capacitor to the input port and the output port. Customizable switching control allows the use of clock signals that do not have overlapping transitions to improve conversion efficiency. Additionally, the input switch is controlled by a clock signal (clock signal) that is level-shifted relative to the input voltage. Control of the level-shifted switching improves efficiency and allows a range of input voltages to be constructed for DC voltage conversion.

[0110] The DC-DC converter 888 is a symmetrical cross-coupled DC-DC converter that receives an input voltage V N and generates a high voltage V for powering the circuit 555 (eg, the driver circuit 115). CHP The voltage is increased by charging and discharging the two capacitors C1 and C2 using a network of transistors. The transistors work as switches, which are controlled by the clock signal (CLK) and its inverse signal (CLK-i). For example, once CLK is high and CLK-i is low, transistors M1 and M3 are turned on, while transistors M4 and M2 are turned off. In this state, capacitor C1 is coupled to the input port and is connected to V IN Once CLK is low and CLK-i is high, transistors M1 and M3 are in the off state, and transistors M4 and M2 are in the on state. In this state, capacitor C1 is coupled to the output port. By charging and discharging the corresponding capacitors C1 and C2, when the voltage is greater than V IN V is generated at the value of CHP The exact upper limit depends on the clock signal (CLK, CLK-i). For example, the frequency of the clock signal may correspond to the voltage at the output port of the DC-DC converter. VCHP .

[0111] In order to control the DC-DC converter voltage V CHP As shown in FIG11 , the circuit 555 may include a DC-DC converter control circuit 999. The DC-DC converter control circuit controls the DC-DC converter 888 based on the input voltage (V IN ) and generates a DC converter voltage (V CHP The generated DC-DC converter voltage (V CHP) is regulated to exceed the input voltage. V CHP The exact value of V CHP The relationship between VIN and IN (e.g., stability, efficiency) within the range of 1.1V to 3.6V. In some embodiments, the charge pump control circuit 999 can also be configured to adjust the DC-DC converter voltage (V CHP ) is limited to the high voltage threshold (V CHPMAX ) to prevent damage (e.g., as determined by the process safe working area).

[0112] FIG11 shows a block diagram of a DC-DC converter control circuit 999. The DC-DC converter control circuit 999 can be configured to provide a voltage (V JN ,V CHP ) generates / controls the clock signal (CLK, CLK-i) of the DC-DC converter. For example, the amplitude of the clock signal (CLK, CLK-i) may be equal to the amplitude of the received input voltage. Alternatively, the frequency of the clock signal (CLK, CLK-i) may be based on the received input voltage (V IN ) amplitude, and regulates proportionally. The DC-DC converter control circuit 999 may also be configured to limit the regulation of the frequency of the clock signal to a maximum value to damage the DC-DC converter and / or prevent the output (V CHP ) Damage to surrounding circuits.

[0113] As shown in FIG11 , the DC-DC converter control circuit may include a potential difference sensing module 141. The potential difference sensing module is configured to generate a potential difference relative to V CHP Therefore, the potential difference sensing module may include a voltage divider or voltage regulating device, relative to V IN and / or V CHP Set at least one voltage value. This is beneficial to make V IN and V CHP The voltage level is adapted to other voltage ranges.

[0114] The DC / DC converter control circuit 999 further includes a differential amplifier unit 142 configured to perform one or more comparisons. The first comparison result 146 is compared with V CHP and V IN The second comparison result 147 will be V CHP The relative magnitude of V is compared to a voltage associated with a high voltage threshold for safe and proper function of the DC-DC converter. The differential amplifier 142 can respond to the comparison in different ways. For example, determining V CHPThe second comparison result, which is equal to or greater than the high voltage threshold, can cause the amplifier to ignore (eg, suppress) the result of the first comparison result. Once the second comparison determines that V CHP When the high voltage threshold is less than the output voltage of the amplifier, the output voltage of the amplifier can be controlled by V CHP With V IN The relationship between them is determined.

[0115] The differential amplifier unit 142 drives a voltage controlled crystal oscillator (VCO) 143. The VCO is configured to receive an input voltage and generate a crystal oscillation signal having a similar frequency to the crystal oscillator. VCO The voltage at the input port (for example, VIN - VCHP ) frequency. The DC-DC converter control circuit also includes a clock logic circuit 145 that receives an oscillation signal from a crystal oscillator and generates a corresponding digital clock signal (CLK) and a complementary clock signal (CLK-i). The clock signals control the DC-DC converter 888 as previously described.

[0116] The DC-DC converter 888 and the DC-DC converter control circuit 999 can work together to generate a voltage (V CHP ), which is the same as the input voltage (V IN ) is higher than the predetermined value (for example: regardless of V IN How to float but never exceed the high voltage threshold (V CHPMAX The high voltage threshold may be selected to correspond to the high voltage threshold rating of the device technology of the linear DC regulator unit.

[0117] As shown in FIG11 , the circuit 555 may include an undervoltage lockout unit (UVLO) circuit 777. Generally speaking, once the DC-DC converter voltage (V CHP ) is at or below the minimum voltage (V CHPMIN ), the UVLO circuit 777 (via the enable signal EN) stops operating. In other words, a single criterion is used to determine whether to enable or disable the driver circuit 115. One advantage of the disclosed undervoltage lockout unit is that it can utilize multiple criteria and logic to determine whether to enable or disable the driver circuit 115. For example, the UVLO circuit can also determine whether the DC-DC converter voltage (V CHP ) by a predetermined amount, which is greater than the output voltage of the linear DC regulator unit 666, and then enables the operation of the driving circuit to ensure that the transistor 111 can be controlled.

[0118] FIG11 shows a block diagram of an embodiment of the voltage under-lock unit 777. The voltage under-lock unit receives the DC-DC converter voltage (V CHP) and outputs an enable signal (EN). The enable signal may be a digital signal EN that can enable / disable the operation of the driver circuit 115 of the linear DC voltage regulator unit 666 based on its high / low level state. The undervoltage lockout unit 777 includes a potential difference sensing module that receives, creates and / or manipulates voltage for comparison. Therefore, the voltage sensing 121 may include a voltage source, a voltage reference source, a voltage regulator, and other circuits to output a voltage relative to another voltage level (e.g., V CHP ) voltage level and outputs a voltage relative to the ground voltage. The undervoltage lockout unit can deliver an output voltage to the comparison stage circuit for comparison. Therefore, the comparator 123 may include a first circuit for determining the relative voltage state. For example, the comparator can be used to indicate that the first voltage is greater than the second voltage. The comparison output 123 outputs one or more signals to indicate the voltage level comparison result. The undervoltage lockout unit also includes a logic stage circuit. The logic circuit 125 may include one or more logic gates, such as inverters, AND, OR, XOR, etc., which can generate an enable signal (EN) based on a logical operation applied to one or more results of the comparison 123. Therefore, the high and low level status of the enable signal can be determined based on at least one criterion. To avoid confusion, it should be understood that other enable signals may also control the voltage stabilization circuit. The externally applied enable (EN) signal can be used to control the overall operation of the voltage stabilization circuit. The enable signal (EN) mentioned in this application is a signal generated within the voltage stabilization circuit and used to control the drive circuit.

[0119] [Alternative embodiment]:

[0120] Example 1. An ultra-thin marker light, comprising:

[0121] case;

[0122] A light guide plate and a circuit board are arranged in the housing;

[0123] The shell is provided with a light-emitting position and a board placement position, the light guide plate is arranged in the light-emitting position, the circuit board is arranged in the board placement position, and the cross-sectional width of the light-emitting position and the shell is smaller than the width of the board placement position and the shell.

[0124] 2. The ultra-thin marker light according to embodiment 1 is characterized in that the light-emitting position is adapted to the cross-sectional width of the housing and the thickness of the light guide plate.

[0125] 3. The ultra-thin marker light according to embodiment 1, characterized in that: the housing is provided with an inwardly recessed support portion, the support portion is disposed within the light-emitting position, and the cross-sectional width between the support portion and the housing is smaller than the width of the panel placement position;

[0126] The light guide plate is abutted against the housing via the support portion.

[0127] 4. The ultra-thin marker light according to embodiment 1 is characterized in that the board placement position is arranged at the edge of the light-emitting position, and the circuit board is arranged at the edge of the light guide plate.

[0128] 5. The ultra-thin marker light according to embodiment 1 is characterized in that: the board placement position is arranged in the middle of the light-emitting position, and the circuit board is arranged in the middle of the light guide plate.

[0129] 6. The ultra-thin marker light according to embodiment 1 is characterized in that: an LED light source is provided on the circuit board, and the light guide plate is optically connected to the LED light source.

[0130] 7. The ultra-thin marker light according to embodiment 1 is characterized in that: the shell includes a first shell and a second shell, the first shell and / or the second shell is provided with a marker hole, and the position of the marker hole is adapted to the position of the light-emitting position.

[0131] 8. The ultra-thin marker light according to embodiment 6 is characterized in that components are provided on the circuit board, and the components are arranged in the board placement position.

[0132] 9. The ultra-thin marker light according to embodiment 1 is characterized in that: a battery is provided in the shell, the shell is provided with a battery position, the cross-sectional width of the battery position is greater than the cross-sectional width of the light-emitting position, and the battery is arranged in the battery position.

[0133] 10. The ultra-thin marker light according to embodiment 1 is characterized in that the edges of the shell are edge portions, the cross-sectional width of the edge portions is greater than the cross-sectional widths of the light-emitting position and the shell, and the edge portions surround the light-emitting position.

[0134] 11. The ultra-thin marker light according to embodiment 9 is characterized in that the cross-sectional width of the housing and the battery position is greater than the cross-sectional width of the housing and the light-emitting position.

[0135] Each embodiment in this specification is described in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each optional technical feature can be combined with other embodiments in any reasonable way. The contents under each title can also be combined in any reasonable way. Each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple. For the relevant parts, please refer to the partial description of the method embodiment.

[0136] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two. It should be understood that the term "and / or" used in this article is merely an association relationship describing associated objects, indicating that three relationships can exist, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0137] Although the above describes specific embodiments of the present application, those skilled in the art will understand that these are merely illustrative and that the scope of protection of the present application is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and such changes and modifications shall fall within the scope of protection of the present application.

Claims

1. An ultra-thin marker light, characterized in that: include: case; A light guide plate and a circuit board are arranged in the housing; The shell is provided with a light-emitting position and a board placement position, the light guide plate is arranged in the light-emitting position, the circuit board is arranged in the board placement position, and the cross-sectional width of the light-emitting position and the shell is smaller than the width of the board placement position and the shell.

2. The ultra-thin marker light according to claim 1, characterized in that: The light-emitting position is adapted to the cross-sectional width of the housing and the thickness of the light guide plate.

3. The ultra-thin marker light according to claim 1, characterized in that: The housing is provided with an inwardly recessed support portion, the support portion is arranged in the light-emitting position, and the cross-sectional width between the support portion and the housing is smaller than the width of the board placement position; The light guide plate is abutted against the housing via the support portion.

4. The ultra-thin marker light according to claim 1, characterized in that: The board placement position is arranged at the edge of the light-emitting position, and the circuit board is arranged at the edge of the light guide plate.

5. The ultra-thin marker light according to claim 1, characterized in that: The board placement position is arranged in the middle of the light-emitting position, and the circuit board is arranged in the middle of the light guide plate.

6. The ultra-thin marker light according to claim 1, characterized in that: An LED light source is provided on the circuit board, and the light guide plate is optically connected to the LED light source.

7. The ultra-thin marker light according to claim 1, characterized in that: The housing includes a first housing and a second housing. The first housing and / or the second housing is provided with a marking hole. The position of the marking hole matches the position of the light-emitting position.

8. The ultra-thin marker light according to claim 6, characterized in that: Components are arranged on the circuit board, and the components are arranged in the board placement position.

9. The ultra-thin marker light according to claim 1, characterized in that: A battery is arranged in the shell, and a battery position is provided in the shell. The cross-sectional width of the battery position is greater than the cross-sectional width of the light-emitting position, and the battery is arranged in the battery position.

10. The ultra-thin marker light according to claim 1, characterized in that: The peripheral edges of the shell are edge portions, the cross-sectional width of the edge portions is greater than the cross-sectional widths of the light-emitting portion and the shell, and the edge portions surround the light-emitting portion.

11. The ultra-thin marker light according to claim 9, characterized in that: The cross-sectional width of the housing and the battery position is greater than the cross-sectional width of the housing and the light-emitting position.

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