CN210670654U - Circuit for controlling brightness of emergency lighting lamp by using switch - Google Patents
Circuit for controlling brightness of emergency lighting lamp by using switch Download PDFInfo
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- CN210670654U CN210670654U CN201921743862.8U CN201921743862U CN210670654U CN 210670654 U CN210670654 U CN 210670654U CN 201921743862 U CN201921743862 U CN 201921743862U CN 210670654 U CN210670654 U CN 210670654U
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Abstract
The utility model discloses an utilize circuit of on-off control emergency lighting lamps and lanterns luminance, include: the emergency lighting system comprises an emergency lighting system and an AC/DC converter, wherein the output end of the emergency lighting system is electrically connected with an LED load, the other output end DIM of the emergency lighting system is electrically connected with a switch S2, a switch S2 is controlled by the emergency lighting system, the emergency lighting system comprises an AC input detection module, a switch time detection module and a lithium battery, the AC input detection module is electrically connected with a live wire VL and a zero wire VN, the switch time detection module is electrically connected between the output end of the AC input detection module and the DIM end, one output end of the AC/DC converter is electrically connected with the anode of the lithium battery, the other output end of the AC/DC converter is electrically connected with the LED load, the LED load is grounded through a series resistor R1, and a resistor R2 is connected with a switch S. The utility model discloses under the condition that does not increase system complexity, the user can realize the dimming function of emergency lighting lamps and lanterns under the emergency lighting condition.
Description
Technical Field
The utility model belongs to the circuit field especially relates to an utilize circuit of on-off control emergency lighting lamps and lanterns luminance.
Background
In some simply controlled emergency lighting systems, the emergency lighting system is turned ON/OFF by a switch. For example, in the emergency lighting system shown in fig. 1, when the switch is closed, if the ac grid is supplying power normally, the system is in the condition of ac grid voltage lighting, and the emergency lighting control chip detects the ac grid voltage, and turns off the emergency lighting. The AC/DC converter also charges the battery while supplying power to the output LED. Under the condition of AC power grid outage, a low-resistance state exists between the zero line VN and the live line VL, no AC high-voltage signal exists, and emergency lighting is started after the emergency lighting control chip detects the state.
When the switch is turned off, no matter whether the power supply of the alternating current power grid is normal or not, the emergency lighting control chip cannot detect the voltage of the alternating current power grid and detects a state that the voltage VN and the voltage VL are high-resistance. In this case, the emergency lighting control chip turns off the emergency lighting.
As can be seen from the circuit in fig. 1, in the above-mentioned simply-controlled emergency lighting control system, when the system is operated in the emergency lighting state, the driving current of the emergency lighting is a fixed driving current and cannot be changed. This presents two problems: 1) under the condition of emergency lighting, the actual required lighting brightness of the lamp is different under different working environments; 2) because the power supply of emergency work is the battery that emergency lighting lamps and lanterns configured, when not needing the biggest emergency lighting luminance, the user need change emergency lighting's drive current, reduces emergency lighting lamps and lanterns luminance to extension emergency lighting operating time.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an utilize circuit of on-off control emergency lighting lamps and lanterns luminance under the condition that does not increase system complexity, the user can realize the dimming function of emergency lighting lamps and lanterns under the emergency lighting condition to can change the luminance of emergency lighting lamps and lanterns when emergency lighting, adjust the emergency operation time of emergency lighting lamps and lanterns according to the demand of actual lighting.
In order to achieve the above object, the utility model adopts the following technical scheme:
a circuit for controlling the intensity of an emergency lighting fixture using a switch, comprising: an emergency lighting system and an AC/DC converter, wherein the output end of the emergency lighting system is electrically connected with the LED load, the other output DIM of the emergency lighting system is electrically connected to a switch S2, the switch S2 is controlled by the emergency lighting system, the emergency lighting system comprises an alternating current input detection module, a switching time detection module and a lithium battery, wherein the alternating current input detection module is electrically connected with a live wire VL and a zero line VN, for detecting the ac grid voltage and the state of the grid switch S1, the switch time detection module is electrically connected between the output end of the ac input detection module and the DIM end, one output end of the AC/DC converter is electrically connected with the anode of the lithium battery, the other output end of the AC/DC converter is electrically connected with the LED load, the LED load is grounded through a series resistor R1, and a resistor R2 is connected in series with the switch S2 and then connected in parallel with the resistor R1.
Preferably, the emergency lighting system further comprises a battery protection management module, wherein the battery protection management module is electrically connected to the positive end and the negative end of the lithium battery, and the battery protection management module comprises a battery overcharge protection module, an overcurrent and output short circuit protection module and a battery overdischarge protection module.
The optimization effect brought by the preferred scheme is that the battery protection management module can control the charging, discharging and protection states of the battery by detecting the voltage of the battery.
Preferably, the converter further comprises a rectifier bridge BR, two alternating current input ends of the rectifier bridge BR are respectively connected with a live line VL and a null line VN, the live line VL is connected with the alternating current input end of the rectifier bridge BR through a switch S1, an output positive end of the rectifier bridge BR is connected with a VBUS interface, an output negative end of the rectifier bridge BR is grounded, the VBUS interface is connected with a capacitor C1, and the VBUS interface is connected with an input end of the AC/DC converter.
Preferably, when the switch S1 is in a conducting state, the ac input detection module detects that the impedance between the live line VL and the neutral line VN is in a low-impedance state; when the switch S1 is in a cut-off state, the ac input detection module detects that the impedance between the live line VL and the neutral line VN is in a high impedance state.
More preferably, a time Toff is set inside the switching time detection module, when the switching time detection module detects that a duration T of maintaining a high-impedance state of the impedance between the live line VL and the neutral line VN in a low-impedance-high-impedance-low-impedance state switching mode is less than the time Toff, the DIM outputs a low level, and when the duration T is greater than or equal to the time Toff, the DIM outputs a high level.
More preferably, the DIM outputs a low level, and the emergency lighting system controls the switch S2 to be turned off; the DIM outputs a high level and the emergency lighting system controls the switch S2 to turn on.
Compared with the prior art, the beneficial effects of the utility model are that:
a circuit of utilizing on-off control emergency lighting lamps and lanterns luminance, can adopt original control switch on the basis that does not increase existing emergency lighting lamps and lanterns system control complexity, realize emergency work lighting power's change to realize emergency lighting lamps and lanterns at the dimming function of emergency lighting during operation, extension emergency lighting operating time.
Drawings
Fig. 1 is a circuit diagram of an emergency lighting system in the background art.
Fig. 2 is a schematic circuit diagram of the emergency lighting lamp using the switch to control the brightness of the emergency lighting lamp.
Fig. 3 is an internal schematic diagram of the emergency lighting system of the present invention.
Fig. 4 is a schematic diagram of the time duration T according to the present embodiment.
Detailed Description
For a better understanding of the present invention, the contents of the present invention will be further clarified below with reference to the accompanying drawings and examples, but the present invention is not limited to the following examples.
Examples
As shown in fig. 2 and 3, a circuit for controlling the brightness of an emergency lighting fixture using a switch includes: the emergency lighting system comprises an emergency lighting system and an AC/DC converter, wherein the output end of the emergency lighting system is electrically connected with an LED load, the other output end DIM of the emergency lighting system is electrically connected with a switch S2, the switch S2 is controlled by the emergency lighting system, the emergency lighting system comprises an alternating current input detection module, a switch time detection module and a lithium battery, the alternating current input detection module is electrically connected with a live wire VL and a zero wire VN and is used for detecting the alternating current power grid voltage and the state of a power grid switch S1, the switch time detection module is electrically connected between the output end of the alternating current input detection module and the DIM end, one output end of the AC/DC converter is electrically connected with the positive electrode of the lithium battery, the other output end of the AC/DC converter is electrically connected with the LED load, the LED load is grounded through a series resistor R1.
The AC/DC converter converts an alternating voltage/current into a direct voltage/current. In the case of normal AC mains supply, the output V1 of the AC/DC converter supplies the LED load and the output V1 of the AC/DC converter also charges the lithium battery of the emergency lighting system.
The emergency lighting system further comprises a battery protection management module, the battery protection management module is electrically connected to the positive end and the negative end of the lithium battery, and the battery protection management module comprises a battery overcharge protection module, an overcurrent and output short-circuit protection module and a battery overdischarge protection module. The battery protection management module controls the charging, discharging and protection states of the battery by detecting the voltage of the battery.
The lithium battery is connected with a switch S3, when the switch S3 is switched on, the EN output end of the emergency lighting system is in short circuit with VBAT +, and the EN voltage of the emergency lighting system is equal to the voltage of the lithium battery; when the switch S3 is off, the EN output state of the emergency lighting system is a high impedance state.
The circuit further comprises a rectifier bridge BR, two alternating current input ends of the rectifier bridge BR are respectively connected with a live wire VL and a zero wire VN, the live wire VL is connected with the alternating current input end of the rectifier bridge BR through a switch S1, the positive output end of the rectifier bridge BR is connected with a VBUS interface, the negative output end of the rectifier bridge BR is grounded, the VBUS interface is connected with a capacitor C1, and the VBUS interface is connected with the input end of an AC/DC converter.
When the switch S1 is in a conducting state, the alternating current input detection module detects that the impedance between the live wire VL and the zero wire VN is in a low-resistance state; when the switch S1 is in the off state, the ac input detection module detects that the impedance between the live line VL and the neutral line VN is in the high impedance state. The switch time detection module detects the duration T of the impedance between the live wire VL and the zero line VN for maintaining the high-resistance state in the low-resistance-high-resistance-low-resistance state switching mode, and outputs the voltage of the DIM end.
The switch time detection module is internally provided with time Toff, when the duration T is less than the time Toff, the DIM end outputs low level, and when the duration T is more than or equal to the time Toff, the DIM end outputs high level.
The DIM end outputs low level, and the emergency lighting system control switch S2 is switched off;
the DIM terminal outputs a high level, and the emergency lighting system control switch S2 is turned on.
With reference to fig. 4, the following is specifically described:
when the initial state of the switch S1 is an ON state and the AC power grid has power failure, the AC input detection module detects that no AC high-voltage signal appears in the live line VL or the zero line VN, and since the switch S1 is in a conducting state, the impedance between the live line VL and the zero line VN is low, and the AC input detection module defines the state of the system at this time as an emergency lighting state.
At time T1, the state of switch S1 changes to the OFF state, at which time the ac input detection module does not detect the presence of an ac high voltage signal on the live VL or neutral VN because S1 is in the OFF state, and the resistance between the live VL or neutral VN is in the high resistance state because of the OFF state of S1. The ac input detection module defines the state of the system at this time as the off state of switch S1.
At time T2, the state of switch S2 changes to the ON state and the ac power grid is powered down, as previously defined, and the system reenters the emergency lighting state.
The alternating current input detection module is used for detecting the state of the alternating current input and the state of the switch S1. And controls the on/off state of the switch S3 according to the AC input state and the state of the switch S1. Meanwhile, an Emer _ ON signal is output according to the ac input state. When no ac input voltage is detected and the switch S1 is in a conducting state, the resistance between the live line VL and the neutral line VN is in a low impedance state, Emer _ ON is 1, and when the above condition is not satisfied, Emer _ ON is 0.
The switching time detection module is used for detecting the interval duration between two times of Emer _ ON ═ 1. When the interval duration between two Emer _ ON times 1 is less than the internal Toff time, its output signal DIM is 0, and when the delay between two Emer _ ON times 1 is greater than or equal to the Toff time, its output signal DIM is 1.
The DIM is used for controlling the state of the switch S2, and if the DIM is 0, the emergency lighting system control switch S2 is turned off; DIM is equal to 1, the emergency lighting system control switch S2 is turned on.
The switch S2 is used to control the magnitude of the current limiting resistor of the LED load. When the switch S2 is in the on state, the current limiting resistance of the LED load is R1// R2, and when the switch S2 is in the off state, the current limiting resistance of the LED load is R1, so that the switch S2 can control the current limiting resistance of the LED load. When the input voltage is constant, the current of the LED load is changed along with the change of the current-limiting resistor, and the aim of dimming by adjusting the output power is fulfilled.
Thus, when in the emergency lighting state, the emergency lighting system defines this switching action as the need for the system to change the output power for emergency operation. The current limiting resistor of the load LED is changed from the original R1// R2 to R1 by controlling the switch S2, so that the output current of the LED load is changed, and the dimming function in the emergency working mode is realized.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A circuit for controlling the intensity of an emergency lighting fixture using a switch, comprising: an emergency lighting system and an AC/DC converter, wherein the output end of the emergency lighting system is electrically connected with the LED load, the other output DIM of the emergency lighting system is electrically connected to a switch S2, the switch S2 is controlled by the emergency lighting system, the emergency lighting system comprises an alternating current input detection module, a switching time detection module and a lithium battery, wherein the alternating current input detection module is electrically connected with a live wire VL and a zero line VN, for detecting the ac grid voltage and the state of the grid switch S1, the switch time detection module is electrically connected between the output end of the ac input detection module and the DIM end, one output end of the AC/DC converter is electrically connected with the anode of the lithium battery, the other output end of the AC/DC converter is electrically connected with the LED load, the LED load is grounded through a series resistor R1, and a resistor R2 is connected in series with the switch S2 and then connected in parallel with the resistor R1.
2. The circuit for controlling the brightness of an emergency lighting fixture by using a switch as claimed in claim 1, wherein the emergency lighting system further comprises a battery protection management module, the battery protection management module is electrically connected to the positive and negative ends of the lithium battery, and the battery protection management module comprises a battery overcharge protection module, an overcurrent and output short circuit protection module and a battery overdischarge protection module.
3. The circuit for controlling the brightness of the emergency lighting lamp by using the switch according to claim 1 or 2, further comprising a rectifier bridge BR, wherein two AC input terminals of the rectifier bridge BR are respectively connected to a live line VL and a neutral line VN, the live line VL is connected to the AC input terminals of the rectifier bridge BR through a switch S1, an output positive terminal of the rectifier bridge BR is connected to a VBUS interface, an output negative terminal of the rectifier bridge BR is connected to ground, the VBUS interface is connected to a capacitor C1, and the VBUS interface is connected to the input terminal of the AC/DC converter.
4. The circuit for controlling the brightness of an emergency lighting fixture with a switch according to claim 1, wherein when the switch S1 is in the conducting state, the ac input detection module detects that the impedance between the live line VL and the neutral line VN is in the low-impedance state; when the switch S1 is in a cut-off state, the ac input detection module detects that the impedance between the live line VL and the neutral line VN is in a high impedance state.
5. The circuit for controlling the brightness of an emergency lighting fixture by using a switch according to claim 4, wherein a time Toff is set inside the switch time detection module, the switch time detection module detects that the DIM outputs a low level when a duration T of maintaining a high impedance state in a low impedance-high impedance-low impedance state switching mode of the impedance between the live line VL and the neutral line VN is less than the time Toff, and the DIM outputs a high level when the duration T is greater than or equal to the time Toff.
6. The circuit of claim 5, wherein the DIM outputs a low level and the emergency lighting system controls the switch S2 to be turned off; the DIM outputs a high level and the emergency lighting system controls the switch S2 to turn on.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921743862.8U CN210670654U (en) | 2019-10-17 | 2019-10-17 | Circuit for controlling brightness of emergency lighting lamp by using switch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921743862.8U CN210670654U (en) | 2019-10-17 | 2019-10-17 | Circuit for controlling brightness of emergency lighting lamp by using switch |
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| CN210670654U true CN210670654U (en) | 2020-06-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110602834A (en) * | 2019-10-17 | 2019-12-20 | 上海芯荃微电子科技有限公司 | Circuit and method for controlling brightness of emergency lighting lamp by using switch |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110602834A (en) * | 2019-10-17 | 2019-12-20 | 上海芯荃微电子科技有限公司 | Circuit and method for controlling brightness of emergency lighting lamp by using switch |
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