CN221202808U - LED emergency light circuit with delay light-off function - Google Patents
LED emergency light circuit with delay light-off function Download PDFInfo
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- CN221202808U CN221202808U CN202322989134.8U CN202322989134U CN221202808U CN 221202808 U CN221202808 U CN 221202808U CN 202322989134 U CN202322989134 U CN 202322989134U CN 221202808 U CN221202808 U CN 221202808U
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Abstract
The utility model discloses an LED emergency light circuit with a delayed light-off function, which comprises an LED driving power supply, an emergency control circuit, a first LED light-emitting circuit and a second LED light-emitting circuit, wherein a storage battery is arranged in the emergency control circuit; the utility model has the advantages that when the commercial power is normal and the user operates the external control switch from on to off, the lighting state can be kept for a preset period of time and then the lamp is automatically turned off, so that the user can leave the scene in enough time under the condition of illumination, and the user is prevented from touching and walking.
Description
Technical Field
The utility model relates to an LED emergency lamp circuit, in particular to an LED emergency lamp circuit with a delay light-off function.
Background
The storage battery is arranged in the LED emergency lamp, when the commercial power is abnormal, the LED emergency lamp cannot be connected with the commercial power voltage, and at the moment, the LED emergency lamp can utilize the storage battery in the LED emergency lamp to supply power for emergency illumination. Currently, LED emergency lamps have been widely used.
The existing LED emergency lamp is generally provided with a live wire access end and a zero wire access end, when in actual use, the zero wire access end of the LED emergency lamp is connected with a zero wire of a mains supply, and the live wire access end is connected with the live wire of the mains supply through an external control switch. When the external control switch is closed, if the mains supply is normal, the LED emergency lamp is connected with the mains supply voltage, enters a normal lighting state, and charges a storage battery when the electric quantity of the storage battery in the LED emergency lamp is insufficient, and if the mains supply is abnormal, the LED emergency lamp cannot be connected with the mains supply voltage, and the LED emergency lamp is powered by the electric energy of the storage battery in the LED emergency lamp to light for emergency lighting; when the external control switch is turned off, the LED emergency light enters a light-off state.
The LED emergency lamp is characterized in that the LED emergency lamp can be used as a common LED lamp when the commercial power is normal, the LED emergency lamp can be quickly lighted when the external control switch is switched on from off to off, and the LED emergency lamp can also be quickly lighted when the external control switch is switched on to off. However, in many occasions of practical application, if the user turns on the external control switch to off, the user still needs to leave the scene, and if the light of the scene is too dark after the LED emergency light is turned off, the user needs to walk in a black mode after leaving the scene, so that great inconvenience is caused.
Disclosure of Invention
The utility model aims to provide an LED emergency lamp circuit with a delay light-off function. When the LED emergency lamp circuit is normal in mains supply and a user operates the external control switch from on to off, the on state of the LED emergency lamp circuit can be kept for a period of time and then is automatically turned off, so that the user can leave the scene in enough time under the condition of illumination, and the user is prevented from touching and walking.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a LED emergency light circuit with delay light-off function, includes LED drive power supply, emergency control circuit, first LED lighting circuit and second LED lighting circuit, emergency control circuit inside have the battery, LED drive power supply be used for when the mains supply is normal and with the outside control switch of LED emergency light circuit and mains connection switch-on mains supply alternating voltage to change mains supply alternating voltage into direct current output, this direct current is used for on the one hand for first LED lighting circuit power supply, on the other hand is used for when battery electric quantity is not enough for the battery charge, emergency control circuit be used for detecting whether the mains supply is normal and with the outside control switch of LED emergency light circuit and mains connection be closed or open to through the outside control switch-on, and the power supply of the mains supply is unusual time, emergency control circuit still be used for when the mains supply is normal from switching on for opening, in the time of the preset, through the battery the time delay power supply make the second LED lighting circuit the luminous time of the delay light-off reaches after the time of presetting the delay light-off, the LED lighting circuit.
The LED driving power supply is provided with a live wire input end, a zero line input end, a positive output end and a negative output end, the emergency control circuit is provided with a live wire detection end, a zero line detection end, an anode, a cathode, an input end, a positive output end and a negative output end, the first LED light emitting circuit and the second LED light emitting circuit are respectively provided with an anode and a cathode, the live wire detection end of the emergency control circuit is connected with the live wire input end of the LED driving power supply, the connection end of the live wire detection end of the emergency control circuit is the live wire access end of the LED emergency light circuit, the zero line detection end of the emergency control circuit is connected with the zero line input end of the LED driving power supply, the connection end of the zero line detection end of the emergency control circuit is the zero line access end of the LED emergency light circuit, the positive output end of the LED driving power supply is connected with the anode of the first LED light emitting circuit and the anode of the emergency control circuit respectively, the cathode of the first LED light emitting circuit is connected with the input end of the emergency control circuit, and the connection end of the emergency control circuit is connected with the cathode of the emergency control circuit.
The emergency control circuit further comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, a first diode, a second diode, a third diode, a fourth diode, a MOS (metal oxide semiconductor) tube, a triode and a first integrated circuit with the model BP5428, wherein the first capacitor is an electrolytic capacitor, the first diode, the third diode and the fourth diode are rectifier diodes, the second diode is a voltage stabilizing diode, and the storage battery is provided with an anode and a cathode; the first resistor has one end connected to the live wire detecting end of the emergency control circuit, the other end connected to the first pin 7 of the first integrated circuit, the second resistor has one end connected to the zero line detecting end of the emergency control circuit, the other end connected to the fourth pin 4 of the first integrated circuit, the third resistor has one end connected to the positive electrode of the first diode, the connecting end connected to the positive electrode of the emergency control circuit, the other end connected to the other end of the third resistor, the other end connected to the fourth pin 8 of the first integrated circuit, the negative electrode of the first diode, the one end of the sixth resistor and the positive electrode of the first capacitor are connected to the positive electrode of the first capacitor, the positive electrode of the third diode and one end of the seventh resistor are connected to the other end of the third resistor, the connecting end is the input end of the emergency control circuit, the other end of the seventh resistor, the one end connected to the positive electrode of the eighth resistor is connected to the positive electrode of the first diode, the other end of the fourth resistor is connected to the negative electrode of the fourth resistor, the other end of the fourth resistor is connected to the positive electrode of the fourth resistor, the fourth resistor is connected to the negative electrode of the fourth resistor, the fourth resistor is connected to the fourth electrode of the fourth resistor, the fifth resistor is connected to the negative electrode of the fourth resistor, the third resistor is connected to the fourth resistor, the fourth resistor is the fourth resistor, the anode of the second diode, the emitter of the triode, the source of the MOS tube, the cathode of the first capacitor, the cathode of the storage battery and the anode of the fourth diode are connected, and the cathode of the fourth diode is the cathode of the emergency control circuit.
The LED driving power supply comprises a full-bridge rectifier bridge stack, a ninth resistor, a second capacitor, a third capacitor, an inductor and a second integrated circuit with the model of BP2861XJ, wherein the second capacitor and the third capacitor are electrolytic capacitors; the full-bridge rectifier bridge stack is provided with two alternating current connecting pins, a positive voltage output pin and a negative voltage output pin, one alternating current connecting pin of the full-bridge rectifier bridge stack is a live wire input end of the LED driving power supply, the other alternating current connecting pin of the full-bridge rectifier bridge stack is a zero line input end of the LED driving power supply, the positive voltage output pin of the full-bridge rectifier bridge stack, the positive electrode of the second capacitor, the 4 th pin of the second integrated circuit and the positive electrode of the third capacitor are connected, the connecting end of the positive voltage output pin of the LED driving power supply is the positive electrode of the LED driving power supply, the negative electrode of the third capacitor is connected with one end of the inductor, the connecting end of the inductor is the negative output end of the LED driving power supply, the 5 th pin of the second integrated circuit is connected with the 6 th pin of the second integrated circuit, one end of the ninth resistor is connected with the 7 th pin of the second integrated circuit, and the other end of the ninth resistor is connected with the negative voltage of the fourth bridge stack.
Compared with the prior art, the LED emergency lamp circuit has the advantages that when the external control switch is switched from on to off and the mains supply is normal, the storage battery is used for supplying power in the preset delay time, so that the second LED light-emitting circuit emits light in the preset delay time to perform delay illumination, and after the preset delay time is reached, the second LED light-emitting circuit does not emit light, therefore, when the mains supply is normal, a user operates the external control switch from on to off, the light-on state of the LED emergency lamp circuit can be kept for a preset period of time and then the light-off is automatically carried out, so that the user has enough time to leave the scene under the illumination condition, and the user is prevented from touching black and walking.
Drawings
FIG. 1 is a block diagram of an LED emergency light circuit with delayed turn-off function of the present utility model;
fig. 2 is a circuit diagram of an LED emergency light circuit with a delayed turn-off function of the present utility model.
Detailed Description
The utility model is described in further detail below with reference to the embodiments of the drawings.
Embodiment one: the utility model provides a LED emergency light circuit with delay light-off function, including LED drive power supply, emergency control circuit, first LED lighting circuit and second LED lighting circuit, emergency control circuit is inside to have the battery, LED drive power supply is used for switching in mains supply alternating voltage when the mains supply is normal and with the outside control switch of LED emergency light circuit and mains connection closed, and change mains supply alternating voltage into direct current output, this direct current is used for supplying power for first LED lighting circuit on the one hand, on the other hand is used for charging for the battery when battery electric quantity is insufficient, emergency control circuit is used for detecting whether the mains supply is normal and with the outside control switch of LED emergency light circuit and mains connection be closed or open, and be closed at outside control switch through battery power supply when the mains supply is unusual, make second LED lighting circuit shiny and carry out emergency lighting, and when the mains supply is normal, through the battery power supply, make second LED lighting circuit shiny in the delay time of presetting, carry out the time delay, and make second LED lighting circuit not shiny after presetting the time delay.
In this embodiment, as shown in fig. 1, the LED driving power supply has a live wire input end, a zero line input end, a positive output end and a negative output end, the emergency control circuit has a live wire detection end, a zero line detection end, a positive electrode, a negative electrode, an input end, a positive output end and a negative output end, the first LED lighting circuit and the second LED lighting circuit all have a positive electrode and a negative electrode, the live wire detection end of the emergency control circuit is connected with the live wire input end of the LED driving power supply, the connection end is a live wire access end of the LED emergency lamp circuit, the zero line detection end of the emergency control circuit is connected with the zero line input end of the LED driving power supply, the connection end is a zero line access end of the LED emergency lamp circuit, the positive output end of the LED driving power supply is connected with the positive electrode of the first LED lighting circuit and the positive electrode of the emergency control circuit, the negative electrode of the first LED lighting circuit is connected with the input end of the emergency control circuit, the negative electrode of the emergency control circuit is connected with the positive electrode of the second LED lighting circuit, and the negative output end of the emergency control circuit is connected with the negative electrode of the emergency control circuit.
When the LED emergency light circuit with the time-delay light-off function is in practical application, the live wire access end of the LED emergency light circuit is connected with the live wire of the mains supply through the external control switch, and the zero wire access end of the LED emergency light circuit is directly connected with the zero wire of the mains supply. When the external control switch is closed and the mains supply is normal, the live wire input end and the zero line input end of the LED driving power supply are connected with normal mains supply alternating voltage, the LED driving power supply converts the mains supply alternating voltage into direct current with preset size and outputs the direct current through the positive output end and the negative output end of the direct current, at the moment, the direct current output by the LED driving power supply drives the first LED light-emitting circuit to emit light on one hand, and the emergency control circuit can charge the storage battery inside the emergency control circuit by using the direct current when the electric quantity of the storage battery is insufficient. When the external control switch is disconnected or the mains voltage is abnormal, the mains alternating voltage connected to the live wire input end and the zero line input end of the LED driving power supply is zero, no voltage is output between the positive output end and the negative output end of the LED driving power supply, namely the output voltage is zero, at the moment, the current flowing through the first LED light-emitting circuit is zero, and the first LED light-emitting circuit does not emit light. When the external control switch is closed and the commercial power is abnormal, the live wire detection end and the zero wire detection end of the emergency control circuit detect the closed state of the external control switch and the abnormal condition of the commercial power, and at the moment, the emergency control circuit drives the second LED light-emitting circuit to emit light by utilizing the electric energy of the storage battery in the emergency control circuit to perform emergency illumination. When the mains supply is normal, if the external control switch is switched from the closed state to the open state, the change from current output to no current output occurs between the positive output end and the negative output end of the LED driving power supply, namely, the current is changed from zero to zero, the first LED light-emitting circuit is changed from a light-emitting state driven by current to a non-light-emitting state driven by no current, the input end of the emergency control circuit senses the moment that the current flowing through the first LED light-emitting circuit is changed from zero to zero through the negative electrode of the first LED light-emitting circuit, namely, the moment that the first LED light-emitting circuit is changed from light-emitting to non-light-emitting, at the moment, the emergency control circuit drives the second LED light-emitting circuit to light-emitting by utilizing the electric energy of the storage battery in the emergency control circuit within a preset delay time, and enables the second LED light-emitting circuit to be changed into the non-light-emitting state after the preset delay time is reached.
Embodiment two: this embodiment is substantially the same as embodiment one, except that: in this embodiment, as shown in fig. 2, the emergency control circuit further includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first capacitor C1, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a MOS transistor Q1, a triode Q2, and a first integrated circuit U1 with a model number BP5428, where the first capacitor C1 is an electrolytic capacitor, the first diode D1, the third diode D3, and the fourth diode D4 are rectifier diodes, the second diode D2 is a voltage regulator diode, and the storage battery has an anode and a cathode; one end of the first resistor R1 is a fire wire detection end of the emergency control circuit, the other end of the first resistor R1 is connected with a 7 th pin of the first integrated circuit U1, one end of the second resistor R2 is a zero line detection end of the emergency control circuit, the other end of the second resistor R2 is connected with a4 th pin of the first integrated circuit U1, one end of the third resistor R3 is connected with the positive pole of the first diode D1, the connection end of the third resistor R3 is the positive pole of the emergency control circuit, the other end of the third resistor R3 is connected with an 8 th pin of the first integrated circuit U1, the negative pole of the first diode D1, one end of the sixth resistor R6 is connected with the positive pole of the first capacitor C1, the positive pole of the third diode D3 is connected with one end of the seventh resistor R7, the connection end of the third resistor R7 is the input end of the emergency control circuit, one end of the eighth resistor R8 is connected with the base of the triode Q2, the collector of the triode Q2, the other end of the sixth resistor R6, one end of the fifth resistor R5, the negative electrode of the second diode D2 and the grid electrode of the MOS tube Q1 are connected, the drain electrode of the MOS tube Q1 is connected with the 5 th pin of the first integrated circuit U1, the connecting end of the MOS tube Q1 is the negative output end of the emergency control circuit, the negative electrode of the third diode D3 is connected with one end of the fourth resistor R4, the connecting end of the third diode D3 is the positive output end of the emergency control circuit, the other end of the fourth resistor R4 is connected with the 6 th pin of the first integrated circuit U1, the positive electrode of the storage battery is connected with the 3 rd pin of the first integrated circuit U1, the other end of the fifth resistor R5, the other end of the eighth resistor R8, the positive electrode of the second diode D2, the emitter of the MOS tube Q1, the negative electrode of the first capacitor C1, the negative electrode of the storage battery and the positive electrode of the fourth diode D4 are connected, and the negative electrode of the emergency control circuit.
In fig. 2, LED1 represents a first LED light-emitting circuit, LED2 represents a second LED light-emitting circuit, and BT1 represents a battery.
In the emergency control circuit of the LED emergency light circuit with the delayed light-off function of this embodiment, the first capacitor C1 is fully charged when the LED driving power source drives the first LED light-emitting circuit to emit light. The seventh resistor R7 is used for detecting whether a current is input to the input end of the emergency control circuit, and when the current is not zero, the triode Q2 is saturated and turned on, and the drain electrode and the source electrode of the MOS transistor Q1 are in an off state. When the voltage at the positive electrode and the negative electrode of the first capacitor C1 is reduced to be smaller than the conducting voltage of the MOS tube Q1, the drain electrode and the source electrode of the MOS tube Q1 are in a cut-off state, when the drain electrode and the source electrode of the MOS tube Q1 are conducted, according to the characteristics of the first integrated circuit U1, even though the 5 th pin and the 1 st pin of the first integrated circuit U1 are not conducted, the voltage output between the positive output end and the negative output end of the emergency control circuit is generated, the emergency control circuit drives the second LED light-emitting circuit to emit light within a period of time (preset delay time) when the voltage at the positive electrode and the negative electrode of the MOS tube Q1 is conducted, when the voltage at the positive electrode and the negative electrode of the MOS tube Q1 is reduced to be smaller than the conducting voltage of the MOS tube Q1, and the light-emitting circuit can not emit light when the voltage at the positive electrode and the negative electrode of the MOS tube Q1 is conducted, and the LED light-emitting circuit can not emit light when the voltage at the positive electrode and the negative electrode of the MOS tube Q1 is not conducted, and the LED light-emitting circuit can not emit light.
Embodiment III: this embodiment is basically the same as the second embodiment, except that: in this embodiment, as shown in fig. 2, the LED driving power supply includes a full-bridge rectifier bridge Db, a ninth resistor R9, a second capacitor C2, a third capacitor C3, an inductor L1, and a second integrated circuit U2 with a model of BP2861XJ, where the second capacitor C2 and the third capacitor C3 are electrolytic capacitors, the full-bridge rectifier bridge Db has two ac connection pins, a positive voltage output pin and a negative voltage output pin, one ac connection pin of the full-bridge rectifier bridge Db is a live wire input end of the LED driving power supply, the other ac connection pin of the full-bridge rectifier bridge Db is a zero line input end of the LED driving power supply, the positive voltage output pin of the full-bridge rectifier bridge Db, the positive electrode of the second capacitor C2, the first pin of the second integrated circuit U2, and the positive electrode of the third capacitor C3 are connected, the negative electrode of the third capacitor C3 is connected to one end of the inductor L1, and the connection end of the other end of the inductor L1 is a negative output end of the LED driving power supply, and the other end of the inductor L1 is connected to the negative voltage output pin of the second integrated circuit U2, the positive voltage output pin of the second capacitor C2 is connected to the second integrated circuit U2, and the negative voltage of the second integrated circuit U2 is connected to the positive electrode of the second capacitor C2, and the positive electrode of the second capacitor C2 is connected to the third capacitor C2.
Claims (4)
1. The utility model provides a LED emergency light circuit with delay light-off function, includes LED drive power supply, emergency control circuit, first LED lighting circuit and second LED lighting circuit, emergency control circuit inside have the battery, LED drive power supply be used for when the mains supply is normal and with the outside control switch of LED emergency light circuit and mains connection switch-on mains supply alternating voltage to change mains supply alternating voltage into direct current output, this direct current is used for on the one hand for first LED lighting circuit power supply, on the other hand is used for when battery electric quantity is not enough for the battery charge, emergency control circuit be used for detecting whether the mains supply is normal and with LED emergency light circuit and mains connection's outside control switch be closed or open to through the outside control switch-on, and the power supply of the mains supply is unusual time, make second LED lighting circuit luminous make emergency lighting when the outside control switch-on is from switching-off, and the mains supply is normal, on the other hand is used for the battery electric quantity is not enough for the battery power supply for the battery electric quantity is not enough for the battery charging, the time delay is passed through in the time of presetting the lighting time when the second LED lighting circuit is not reached to the time delay light-off, the LED lighting circuit is made to give off.
2. The LED emergency light circuit with the delayed turn-off function according to claim 1, wherein the LED driving power supply is provided with a live wire input end, a zero wire input end, a positive output end and a negative output end, the emergency control circuit is provided with a live wire detection end, a zero wire detection end, a positive electrode, a negative electrode, an input end, a positive output end and a negative output end, the first LED light-emitting circuit and the second LED light-emitting circuit are respectively provided with a positive electrode and a negative electrode, the live wire detection end of the emergency control circuit is connected with the live wire input end of the LED driving power supply, the connection end of the live wire detection end of the emergency control circuit is the live wire connection end of the LED emergency light circuit, the zero wire detection end of the emergency control circuit is connected with the zero wire input end of the LED driving power supply, the connection end of the zero wire connection end of the LED emergency light circuit is the positive electrode of the first LED light-emitting circuit and the positive electrode of the emergency control circuit, the positive electrode of the first LED light-emitting circuit is connected with the positive electrode of the emergency control circuit, the positive electrode of the emergency control circuit is connected with the negative electrode of the emergency control circuit, and the positive electrode of the emergency control circuit is connected with the negative electrode of the emergency control circuit.
3. The LED emergency light circuit with the delayed turn-off function according to claim 2, wherein the emergency control circuit further comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, a first diode, a second diode, a third diode, a fourth diode, a MOS (metal oxide semiconductor) diode, a triode and a first integrated circuit with the model BP5428, the first capacitor is an electrolytic capacitor, the first diode, the third diode and the fourth diode are rectifier diodes, the second diode is a zener diode, and the storage battery has an anode and a cathode; the first resistor has one end connected to the live wire detecting end of the emergency control circuit, the other end connected to the first pin 7 of the first integrated circuit, the second resistor has one end connected to the zero line detecting end of the emergency control circuit, the other end connected to the fourth pin 4 of the first integrated circuit, the third resistor has one end connected to the positive electrode of the first diode, the connecting end connected to the positive electrode of the emergency control circuit, the other end connected to the other end of the third resistor, the other end connected to the fourth pin 8 of the first integrated circuit, the negative electrode of the first diode, the one end of the sixth resistor and the positive electrode of the first capacitor are connected to the positive electrode of the first capacitor, the positive electrode of the third diode and one end of the seventh resistor are connected to the other end of the third resistor, the connecting end is the input end of the emergency control circuit, the other end of the seventh resistor, the one end connected to the positive electrode of the eighth resistor is connected to the positive electrode of the first diode, the other end of the fourth resistor is connected to the negative electrode of the fourth resistor, the other end of the fourth resistor is connected to the positive electrode of the fourth resistor, the fourth resistor is connected to the negative electrode of the fourth resistor, the fourth resistor is connected to the fourth electrode of the fourth resistor, the fifth resistor is connected to the negative electrode of the fourth resistor, the third resistor is connected to the fourth resistor, the fourth resistor is the fourth resistor, the anode of the second diode, the emitter of the triode, the source of the MOS tube, the cathode of the first capacitor, the cathode of the storage battery and the anode of the fourth diode are connected, and the cathode of the fourth diode is the cathode of the emergency control circuit.
4. The LED emergency lamp circuit with the delayed turn-off function according to claim 2, wherein the LED driving power supply comprises a full-bridge rectifier bridge stack, a ninth resistor, a second capacitor, a third capacitor, an inductor and a second integrated circuit with the model BP2861XJ, and the second capacitor and the third capacitor are electrolytic capacitors; the full-bridge rectifier bridge stack is provided with two alternating current connecting pins, a positive voltage output pin and a negative voltage output pin, one alternating current connecting pin of the full-bridge rectifier bridge stack is a live wire input end of the LED driving power supply, the other alternating current connecting pin of the full-bridge rectifier bridge stack is a zero line input end of the LED driving power supply, the positive voltage output pin of the full-bridge rectifier bridge stack, the positive electrode of the second capacitor, the 4 th pin of the second integrated circuit and the positive electrode of the third capacitor are connected, the connecting end of the positive voltage output pin of the LED driving power supply is the positive electrode of the LED driving power supply, the negative electrode of the third capacitor is connected with one end of the inductor, the connecting end of the inductor is the negative output end of the LED driving power supply, the 5 th pin of the second integrated circuit is connected with the 6 th pin of the second integrated circuit, one end of the ninth resistor is connected with the 7 th pin of the second integrated circuit, and the other end of the ninth resistor is connected with the negative voltage of the fourth bridge stack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322989134.8U CN221202808U (en) | 2023-11-07 | 2023-11-07 | LED emergency light circuit with delay light-off function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322989134.8U CN221202808U (en) | 2023-11-07 | 2023-11-07 | LED emergency light circuit with delay light-off function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221202808U true CN221202808U (en) | 2024-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322989134.8U Active CN221202808U (en) | 2023-11-07 | 2023-11-07 | LED emergency light circuit with delay light-off function |
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| Country | Link |
|---|---|
| CN (1) | CN221202808U (en) |
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2023
- 2023-11-07 CN CN202322989134.8U patent/CN221202808U/en active Active
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