CN113438772A - Emergency lighting circuit and device - Google Patents
Emergency lighting circuit and device Download PDFInfo
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- CN113438772A CN113438772A CN202110683731.0A CN202110683731A CN113438772A CN 113438772 A CN113438772 A CN 113438772A CN 202110683731 A CN202110683731 A CN 202110683731A CN 113438772 A CN113438772 A CN 113438772A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/155—Coordinated control of two or more light sources
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Abstract
The utility model relates to an emergency lighting circuit and device is provided with two kinds of different lamp pearl loads simultaneously, and under the constant current source circuit can provide the condition of steady current, constant current source circuit, first lamp pearl load and second lamp pearl load three formed closed circuit, and normal lighting operation is realized to first lamp pearl load of accessible and second lamp pearl load. When the constant current source circuit can not provide the steady current, the emergency battery group starts as the power, forms closed circuit between emergency battery group, on-off control device and the second lamp pearl load this moment, and second lamp pearl load starts the illumination under the effect of emergency battery group, realizes the emergency lighting operation. Above-mentioned scheme combines together normal illumination and emergency lighting, and accessible external power source realizes normal illumination when having external power source, and under the condition that does not have external power source power supply, can switch into the power supply of emergency battery group again, realizes emergency lighting, can effectively simplify the circuit structure of emergency lighting scheme.
Description
Technical Field
The application relates to the technical field of circuits, in particular to an emergency lighting circuit and an emergency lighting device.
Background
Illumination that is enabled due to a power failure for normal illumination is referred to as emergency illumination. Emergency lighting is an important safety facility for modern public and industrial buildings, which is closely related to personal safety and building safety. When a fire or other disasters happen to a building and the power supply is interrupted, emergency lighting plays an important role in evacuation of personnel, fire rescue work, important production, continuous operation of work or necessary operation and disposal.
At present, a plurality of schemes for emergency lighting are provided, but the emergency lighting and the normal lighting are separated, the battery charging in an emergency lighting circuit is also powered by a separate circuit, and a special integrated chip is also adopted as a circuit detection chip, so that the circuit structure of the whole emergency lighting scheme is complex.
Disclosure of Invention
Therefore, it is necessary to provide an emergency lighting circuit and an emergency lighting device for solving the problem of the conventional emergency lighting scheme that the circuit structure is complicated.
An emergency lighting circuit comprises a constant current source circuit, a first lamp bead load, a second lamp bead load, a switch control device and an emergency battery pack, wherein a first end of the constant current source circuit is connected with a first end of the first lamp bead load and a first end of the switch control device, a second end of the first lamp bead load is connected with a first end of the second lamp bead load and a second end of the switch control device, a second end of the second lamp bead load is connected with a second end of the constant current source circuit, a second end of the constant current source circuit is grounded, a third end of the switch control device is connected with a third end of the second lamp bead load, a first end of the emergency battery pack is connected with a second end of the switch control device, and a fourth end of the switch control device is connected with a second end of the emergency battery pack and a second end of the second lamp bead load; the first lamp bead load and the second lamp bead load are used for starting to illuminate when the constant current source circuit outputs constant current; and the switch control device is used for conducting a second end of the switch control device with a third end of the switch control device when the constant current source circuit does not output current, and transmitting the electric energy of the emergency battery pack to the second lamp bead load so as to enable the second lamp bead load to be turned on for emergency lighting.
In one embodiment, the constant current source circuit includes a rectifier bridge, a first filter capacitor, a current limiting chip, an adjustable resistor, and a discharge resistor, where the rectifier bridge is used to connect to an external ac power source, the rectifier bridge connects the current limiting chip and a first end of the first filter capacitor, a second end of the first filter capacitor is grounded, a first end and a second end of the adjustable resistor are respectively connected to the current limiting chip, a first end of the adjustable resistor is connected to a first end of the discharge resistor, a second end of the adjustable resistor is connected to a second end of the first filter capacitor and a second end of the discharge resistor, the first end of the discharge resistor is used as the first end of the constant current source circuit, and the second end of the discharge resistor is used as the second end of the constant current source circuit.
In one embodiment, the constant current source circuit further includes a first diode and an energy storage inductor, a first end of the adjustable resistor is connected to a first end of the energy storage inductor, a second end of the energy storage inductor is connected to a first end of the discharge resistor, a second end of the adjustable resistor is connected to a cathode of the first diode, and an anode of the first diode is connected to a second end of the first filter capacitor.
In one embodiment, the constant current source circuit further includes a second filter capacitor, a first terminal of the second filter capacitor is connected to the second terminal of the energy storage inductor and the first terminal of the discharge resistor, and a second terminal of the filter capacitor is connected to the second terminal of the discharge resistor and the anode of the first diode.
In one embodiment, the constant current source circuit further includes a fuse, and the rectifier bridge is connected to an external ac power source through the fuse.
In one embodiment, the first lamp bead load comprises more than two lamp beads, and each lamp bead is connected in series.
In one embodiment, the second lamp bead load includes a second diode and a lamp bead string, an anode of the second diode is used as a first end of the second lamp bead load, a cathode of the second diode is connected to the first end of the lamp bead string, a common end of the second diode is used as a third end of the second lamp bead load, and a second end of the lamp bead string is used as a second end of the second lamp bead load.
In one embodiment, the switching control apparatus includes a switching device, a pull-up resistor, and a pull-down resistor, a first terminal of the pull-up resistor is used as a first terminal of the switching control apparatus, a second terminal of the pull-up resistor is connected to the first terminal of the pull-down resistor and a control terminal of the switching device, a second terminal of the pull-down resistor is used as a fourth terminal of the switching control apparatus, an input terminal of the switching device is used as a second terminal of the switching control apparatus, and an output terminal of the switching device is used as a third terminal of the switching control apparatus.
In one embodiment, the switching device is a transistor or a mosfet.
An emergency lighting device comprises the emergency lighting circuit.
Above-mentioned emergency lighting circuit and device are provided with two kinds of different lamp pearl loads simultaneously, and under the constant current source circuit can provide the condition of steady current, constant current source circuit, first lamp pearl load and second lamp pearl load three formed closed circuit, and normal lighting operation is realized to first lamp pearl load of accessible and second lamp pearl load. When the constant current source circuit can not provide the steady current, the emergency battery group starts as the power, forms closed circuit between emergency battery group, on-off control device and the second lamp pearl load this moment, and second lamp pearl load starts the illumination under the effect of emergency battery group, realizes the emergency lighting operation. Above-mentioned scheme combines together normal illumination and emergency lighting, and accessible external power source realizes normal illumination when having external power source, and under the condition that does not have external power source power supply, can switch into the power supply of emergency battery group again, realizes emergency lighting, can effectively simplify the circuit structure of emergency lighting scheme.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of an emergency lighting circuit;
FIG. 2 is a schematic diagram of an emergency lighting circuit according to another embodiment;
fig. 3 is a schematic diagram of an emergency lighting circuit according to another embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, an emergency lighting circuit includes a constant current source circuit 10, a first lamp bead load 20, a second lamp bead load 30, a switch control device 40 and an emergency battery pack 50, wherein a first end of the constant current source circuit 10 is connected to a first end of the first lamp bead load 20 and a first end of the switch control device 40, a second end of the first lamp bead load 20 is connected to a first end of the second lamp bead load 30 and a second end of the switch control device 40, a second end of the second lamp bead load 30 is connected to a second end of the constant current source circuit 10, a second end of the constant current source circuit 10 is grounded, a third end of the switch control device 40 is connected to a third end of the second lamp bead load 30, a first end of the emergency battery pack 50 is connected to a second end of the switch control device 40, and a fourth end of the switch control device 40 is connected to a second end of the emergency battery pack 50 and a second end of the second lamp bead load 30; the first lamp bead load 20 and the second lamp bead load 30 are used for turning on for illumination when the constant current source circuit 10 outputs a constant current; the switch control device 40 is used for conducting a second end of the switch control device 40 with a third end of the switch control device 40 when the constant current source circuit 10 does not output current, and transmitting the electric energy of the emergency battery pack 50 to the second lamp bead load 30, so that the second lamp bead load 30 is turned on for emergency lighting.
Specifically, the constant current source circuit 10 is a circuit capable of outputting constant direct current power. The specific type of the constant current source circuit 10 is not unique, and the specific structure thereof is different according to the type of the power source inputted by the constant current source circuit, for example, in an embodiment, since the user uses an alternating current power source of power frequency (generally 50Hz) more in daily life, the constant current source circuit 10 may be a circuit with a rectification function, and through the circuit arrangement function, the alternating current can be converted into a direct current, so as to provide electric energy for the first lamp bead load 20 and the second lamp bead load 30.
Under the condition that constant current source circuit 10 has the steady current output, the first end of on-off control device 40 links to each other with the first end of constant current source circuit 10, and on-off control device 40 disconnection is pulled to high level state this moment to emergent group battery 50 unable normal second lamp pearl load 30 electric energy of carrying. Meanwhile, the current shunted between the first lamp bead load 20 and the second lamp bead load 30 does not flow through the switch control device 40, so that the charging operation of the emergency battery pack 50 can be realized while normal illumination is realized when the constant current source is short-circuited and electric energy is output.
It should be noted that when the constant current source circuit 10 outputs a constant current and the emergency battery pack 50 is not fully charged with electric power, the constant current source circuit 10 can also charge the emergency battery pack 50. In one embodiment, the emergency battery pack 50 includes an emergency battery and a battery protection circuit, and the battery protection circuit can be turned on to charge when detecting that the power of the emergency battery is not full, and can stop charging the emergency battery when detecting that the power of the emergency battery is full, and at this time, the output power of the constant current source circuit 10 is only used to supply power to the first lamp bead load 20 and the second lamp bead load 30.
In another embodiment, the constant current source circuit 10 charges the emergency battery pack 50, and may also be implemented by setting a voltage difference between the emergency battery pack 50 and the first lamp bead load 20 and the second lamp bead load 30. The voltage of first lamp pearl load 20 and second lamp pearl load 30 is the clamp state under the constant current state, can regard as fixed voltage, and in normal lighting process, emergent group battery 50 can regard as and connect in parallel with second lamp pearl load 30, and circuit current can be preferentially full of the lower emergent group battery 50 of voltage this moment, and emergent lamp pearl cluster return circuit divides only little electric current.
When the constant current source circuit 10 does not provide current, no current flows out from the first end of the constant current source circuit 10, and since the fourth end of the switch control device 40 is connected to the second end of the second lamp bead load 30 and grounded, the fourth end of the switch control device 40 is pulled down to a low level state, and finally the switch control device 40 is turned on. Under this kind of state, the electric energy of emergency battery group 50 output will flow in through switch control device 40's second end, and the third end through switching device flows out, finally flows in second lamp pearl load 30 through second lamp pearl load 30's third end, for second lamp pearl load 30 power supply to make second lamp pearl load 30 give out light and realize emergency lighting operation.
Referring to fig. 2, in an embodiment, the constant current source circuit 10 includes a rectifier bridge 11, a first filter capacitor C1, a current limiting chip 12, an adjustable resistor R1 and a discharge resistor R2, the rectifier bridge 11 is configured to be connected to an external ac power source, the rectifier bridge 11 is connected to the current limiting chip 12 and a first end of the first filter capacitor C1, a second end of the first filter capacitor C1 is grounded, a first end and a second end of the adjustable resistor R1 are respectively connected to the current limiting chip 12, a first end of the adjustable resistor R1 is connected to a first end of the discharge resistor R2, a second end of the adjustable resistor R1 is connected to a second end of the first filter capacitor C1 and a second end of the discharge resistor R2, a first end of the discharge resistor R2 is used as a first end of the constant current source circuit 10, and a second end of the discharge resistor R2 is used as a second end of the constant current source circuit 10.
Specifically, in this embodiment, the constant current source circuit 10 is connected to an external ac power supply, and provides a stable dc power supply for the subsequent first lamp bead load 20 and the second lamp bead load 30 through rectification of the rectifier bridge 11 and the current limiting effect of the current limiting chip 12. In this embodiment, the resistance of the adjustable resistor R1 disposed at two ends of the current-limiting chip 12 can be adjusted according to actual requirements, so that the constant current source circuit 10 can output electric energy of different current magnitudes to supply power to the first lamp bead load 20 and the second lamp bead load 30. And set up a discharge resistance R2 at first lamp pearl load 20 and second lamp pearl load 30's series branch both ends simultaneously, further guarantee under the normal lighting return circuit, the operational reliability of first lamp pearl load 20 and second lamp pearl load 30. It should be noted that the specific type of the current limiting chip 12 is not exclusive, as long as it can provide the first lamp bead load 20 and the second lamp bead load 30 with the corresponding current.
Referring to fig. 3, in an embodiment, the constant current source circuit 10 further includes a first diode D1 and an energy storage inductor T, a first terminal of the adjustable resistor R1 is connected to a first terminal of the energy storage inductor T, a second terminal of the energy storage inductor T is connected to a first terminal of the discharge resistor R2, a second terminal of the adjustable resistor R1 is connected to a cathode of the first diode D1, and an anode of the first diode D1 is connected to a second terminal of the first filter capacitor C1.
Specifically, in this embodiment, a first diode D1 is disposed between the second end of the adjustable resistor R1 and the second end of the first filter capacitor C1, and an energy storage inductor T is disposed between the first end of the adjustable resistor R1 and the first end of the discharge resistor R2, so that chopping is completed through the combination of the first diode D1 and the energy storage inductor T, that is, the direct current output from the two ends of the adjustable resistor R1 is converted into a direct current with another fixed voltage, and the power supply operation of the first lamp bead load 20 and the second lamp bead load 30 is further realized.
Further, referring to fig. 3, in an embodiment, the constant current source circuit 10 further includes a second filter capacitor C2, a first terminal of the second filter capacitor C2 is connected to the second terminal of the energy storage inductor T and the first terminal of the discharge resistor R2, and a second terminal of the filter capacitor is connected to the second terminal of the discharge resistor R2 and the anode of the first diode D1.
Specifically, in order to ensure that the direct current that finally flows into the first lamp bead load 20 and the second lamp bead load 30 does not have interference components, a second filter capacitor C2 is further disposed at two ends of the discharge resistor R2 in this embodiment, so that after the first diode D1 and the energy storage inductor T perform chopping processing, the output direct current passes through the second filter capacitor C2 to filter the interference components, and the working reliability of the emergency lighting circuit can be further improved.
Referring to fig. 3, in one embodiment, the constant current source circuit 10 further includes a fuse F, and the rectifier bridge 11 is connected to an external ac power source through the fuse F.
In particular, the fuse F (fuse) is also called a current fuse F, and mainly plays a role of overload protection. The fuse F can be fused to cut off the current when the current is abnormally increased to a certain height and heat, so that the safe operation of the circuit is protected. Because constant current source circuit 10 realizes the power supply of first lamp pearl load 20 and second lamp pearl load 30 after converting the alternating current of inputing into the direct current in this embodiment, so in order to guarantee the safe operation of whole circuit, cause the harm to the circuit when avoiding the electric current abnormal, still be provided with fuse F between rectifier bridge 11 and outside alternating current power supply. It is understood that, in one embodiment, when the ac power supply connected to the rectifier bridge 11 is a power frequency power supply, the fuse F is correspondingly disposed at the port where the rectifier bridge 11 is connected to the live line.
It should be noted that the specific structure of the first lamp bead load 20 is not exclusive, and in one embodiment, the first lamp bead load 20 includes more than two lamp beads, each of which is connected in series.
Specifically, in this embodiment, an equal-bead string formed by connecting a plurality of beads in series is used as the first bead load 20, and under the action of the dc power supply output by the constant current source circuit 10, all beads in the first bead load 20 are turned on together, so as to implement the lighting operation.
It should be noted that the specific type of lamp bead is not exclusive and in one embodiment, may be an LED (Light Emitting Diode) type lamp bead. In a normal lighting loop (that is, when the constant current source circuit 10 outputs a constant current to make the constant current source circuit 10, the first lamp bead load 20 and the second lamp bead load 30 form a closed loop), due to the characteristic of a lamp bead diode, after the current flows through the lamp bead, the voltage clamping at two ends of the lamp bead is within a fixed stable range, the clamping voltage ensures the power supply voltage range of the emergency battery pack 50, when the voltage of the emergency battery pack 50 is lower (that is, lower than the clamping voltage at two ends of the lamp bead), the emergency battery pack 50 is charged, and after the emergency battery pack is fully charged, the charging operation is automatically closed under the action of a voltage detection circuit and the like in the emergency battery pack 50. After the circuit input end is powered off (i.e. when the constant current source circuit does not output current), the normal power supply voltage is powered off, and at the moment, the second end and the third end of the switch control device 40 are conducted, so that the emergency battery pack 50 outputs electric energy to the second lamp bead load 30 for emergency power supply.
Referring to fig. 2 or fig. 3, in an embodiment, the second lamp bead load 30 includes a second diode D2 and a lamp bead string 31, an anode of the second diode D2 is used as a first end of the second lamp bead load 30, a cathode of the second diode D2 is connected to the first end of the lamp bead string 31, a common end of the second diode D2 is used as a third end of the second lamp bead load 30, and a second end of the lamp bead string 31 is used as a second end of the second lamp bead load 30.
Specifically, in the present embodiment, the second diode D2 and one bead string are used as the second lamp bead load 30, and the bead string is a lighting device formed by a plurality of lamp beads, which are connected in series or in parallel. When the constant current source circuit 10 can normally output electric energy, the first lamp bead load 20 and the second lamp bead load 30 are driven to operate, and under the condition that charging of the emergency battery pack 50 is not considered, the first lamp bead load 20 of the current mirror flows out, and sequentially flows through the anode of the second diode D2, the cathode of the second diode D2 and the lamp bead string 31 to finally form a closed loop, and the lamp bead strings 31 in the first lamp bead load 20 and the second lamp bead load 30 realize normal lighting operation together. And when the constant current source circuit 10 does not output electric energy, the switch control device 40 is conducted, at this time, the electric energy output by the emergency battery pack 50 flows in through the second end of the switch control device 40, flows out to the lamp bead string 31 of the second lamp bead load 30 through the third end of the switch control device 40, finally a closed loop is formed, and emergency lighting operation is realized through the lamp bead string 31.
It should be noted that the specific type of the switch control apparatus 40 is not exclusive, and referring to fig. 2 or fig. 3, in an embodiment, the switch control apparatus 40 includes a switch device Q, a pull-up resistor R3 and a pull-down resistor, a first terminal of the pull-up resistor R3 is used as a first terminal of the switch control apparatus 40, a second terminal of the pull-up resistor R3 is connected to the first terminal of the pull-down resistor and a control terminal of the switch device Q, a second terminal of the pull-down resistor is used as a fourth terminal of the switch control apparatus 40, an input terminal of the switch device Q is used as a second terminal of the switch control apparatus 40, and an output terminal of the switch device Q is used as a third terminal of the switch control apparatus 40.
Specifically, in this embodiment, when the constant current source circuit 10 can normally provide electric energy, the pull-up resistor R3 is pulled up to a high level at this time, so that the switching device Q is in an off state, if there is a need to charge the emergency battery pack 50, a part of the current flowing out from the first lamp bead load 20 flows into the second lamp bead load 30 to be driven, and the other part of the current directly flows into the first end of the emergency battery pack 50 to charge the emergency battery pack 50; if there is not the demand of charging, the electric current that first lamp pearl load 20 flowed out all flows into second lamp pearl load 30 and drives under this kind of state, realizes normal illumination. When constant current source circuit 10 can not normally supply power, pull-down resistance pull-down low level this moment for switching device Q is in the conducting state, and the electric energy of emergency battery pack 50's first end output this moment will be via switching device Q's input, exports to lamp pearl cluster 31 by switching device Q's output, realizes emergency lighting operation.
It is understood that the specific type of the switching device Q is not exclusive, as long as the switching device Q is capable of being in an open state when the pull-up resistor R3 is pulled high and in a closed state when the pull-down resistor R is pulled low, for example, in one embodiment, the switching device Q is a transistor or a mosfet.
Specifically, a Transistor (BJT) is called a semiconductor Transistor, also called a Bipolar Transistor, and is a semiconductor device for controlling current. The function is to amplify the weak signal into an electric signal with larger amplitude value, and the electric signal is also used as a contactless switch. In this embodiment, the switching characteristic of the transistor is used as the switching device Q to implement the start control operation of the emergency lighting. A Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), which is a MOSFET, can be divided into two types, i.e., an "N-type" and a "P-type", according to the different polarities of its "channels" (working carriers), and the MOSFET is usually called an NMOSFET and a PMOSFET, and the other types include NMOS and PMOS for short. Further, in one embodiment, since the switching device Q is in an open state when the control terminal is at a high level and in a closed state when the control terminal is at a low level, a PMOS transistor may be used as the switching device Q.
Above-mentioned emergency lighting circuit is provided with two kinds of different lamp pearl loads simultaneously, and under the condition that constant current source circuit 10 can provide the steady current, constant current source circuit 10, first lamp pearl load 20 and second lamp pearl load 30 three formed closed circuit, and normal lighting operation is realized to first lamp pearl load 20 of accessible and second lamp pearl load 30. When the constant current source circuit 10 can not provide stable current, the emergency battery pack 50 is started to serve as a power supply, a closed loop is formed among the emergency battery pack 50, the switch control device 40 and the second lamp bead load 30 at the moment, and the second lamp bead load 30 starts lighting under the action of the emergency battery pack 50 to realize emergency lighting operation. Above-mentioned scheme combines together normal illumination and emergency lighting, and accessible external power source realizes normal illumination when having external power source, and under the condition that does not have the external power source power supply, can switch into the power supply of emergency battery group 50 again, realizes emergency lighting, can effectively simplify the circuit structure of emergency lighting scheme.
An emergency lighting device comprises the emergency lighting circuit.
Specifically, as shown in the above embodiments and the accompanying drawings, the emergency lighting circuit includes a constant current source circuit 10, a first lamp bead load 20, second lamp pearl load 30, on-off control device 40 and emergency battery group 50, the first end of first lamp pearl load 20 and the first end of on-off control device 40 are connected to the first end of constant current source circuit 10, the first end of second lamp pearl load 30 and the second end of on-off control device 40 are connected to the second end of first lamp pearl load 20, the second end of constant current source circuit 10 is connected to the second end of second lamp pearl load 30, the second end ground connection of constant current source circuit 10, the third end of second lamp pearl load 30 is connected to the third end of on-off control device 40, the second end of on-off control device 40 is connected to the first end of emergency battery group 50, the second end of emergency battery group 50 and the second end of second lamp pearl load 30 are connected to the fourth end of on-off control device 40.
The constant current source circuit 10 is a circuit capable of outputting constant dc power. The specific type of the constant current source circuit 10 is not unique, and the specific structure thereof is different according to the type of the power source inputted by the constant current source circuit, for example, in an embodiment, since the user uses an alternating current power source of power frequency (generally 50Hz) more in daily life, the constant current source circuit 10 may be a circuit with a rectification function, and through the circuit arrangement function, the alternating current can be converted into a direct current, so as to provide electric energy for the first lamp bead load 20 and the second lamp bead load 30.
Under the condition that constant current source circuit 10 has the output of stabilization current, the first end of on-off control device 40 links to each other with the first end of constant current source circuit 10, switching device is pulled to the high level state this moment, on-off control device 40 disconnection, make emergent battery pack 50 unable to carry the electric energy to second lamp pearl load 30, the electric current of shunting between first lamp pearl load 20 and second lamp pearl load 30 simultaneously, can not flow through on-off control device 40 yet, but directly flow in emergent battery pack 50 and realize emergent battery pack 50's operation of charging, thereby guarantee when the constant current source short circuit has electric energy output, can realize the operation of charging of emergent battery pack 50 when realizing normal illumination.
When the constant current source circuit 10 does not provide current, no current flows out from the first end of the constant current source circuit 10, and since the fourth end of the switch control device 40 is connected to the second end of the second lamp bead load 30 and grounded, the fourth end of the switch control device 40 is pulled down to a low level state, and finally the switch control device 40 is turned on. Under this kind of state, the electric energy of emergency battery group 50 output will flow in through switching control device 40's second end, and the third end through switching device Q flows out, finally flows in second lamp pearl load 30 through second lamp pearl load 30's third end, for second lamp pearl load 30 power supply to make second lamp pearl load 30 give out light and realize emergency lighting operation.
Above-mentioned emergency lighting device is provided with two kinds of different lamp pearl loads simultaneously, and under the condition that constant current source circuit 10 can provide the steady current, constant current source circuit 10, first lamp pearl load 20 and second lamp pearl load 30 three formed closed circuit, and normal lighting operation is realized to first lamp pearl load 20 of accessible and second lamp pearl load 30. When the constant current source circuit 10 can not provide stable current, the emergency battery pack 50 is started to serve as a power supply, a closed loop is formed among the emergency battery pack 50, the switch control device 40 and the second lamp bead load 30 at the moment, and the second lamp bead load 30 starts lighting under the action of the emergency battery pack 50 to realize emergency lighting operation. Above-mentioned scheme combines together normal illumination and emergency lighting, and accessible external power source realizes normal illumination when having external power source, and under the condition that does not have the external power source power supply, can switch into the power supply of emergency battery group 50 again, realizes emergency lighting, can effectively simplify the circuit structure of emergency lighting scheme.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An emergency lighting circuit is characterized by comprising a constant current source circuit, a first lamp bead load, a second lamp bead load, a switch control device and an emergency battery pack,
the first end of the constant current source circuit is connected with the first end of the first lamp bead load and the first end of the switch control device, the second end of the first lamp bead load is connected with the first end of the second lamp bead load and the second end of the switch control device, the second end of the second lamp bead load is connected with the second end of the constant current source circuit, the second end of the constant current source circuit is grounded, the third end of the switch control device is connected with the third end of the second lamp bead load, the first end of the emergency battery pack is connected with the second end of the switch control device, and the fourth end of the switch control device is connected with the second end of the emergency battery pack and the second end of the second lamp bead load;
the first lamp bead load and the second lamp bead load are used for starting to illuminate when the constant current source circuit outputs constant current; and the switch control device is used for conducting a second end of the switch control device with a third end of the switch control device when the constant current source circuit does not output current, and transmitting the electric energy of the emergency battery pack to the second lamp bead load so as to enable the second lamp bead load to be turned on for emergency lighting.
2. The emergency lighting circuit according to claim 1, wherein the constant current source circuit comprises a rectifier bridge, a first filter capacitor, a current limiting chip, an adjustable resistor and a discharge resistor, the rectifier bridge is used for connecting an external ac power supply, the rectifier bridge is connected to the current limiting chip and a first end of the first filter capacitor, a second end of the first filter capacitor is grounded, a first end and a second end of the adjustable resistor are respectively connected to the current limiting chip, a first end of the adjustable resistor is connected to a first end of the discharge resistor, a second end of the adjustable resistor is connected to a second end of the first filter capacitor and a second end of the discharge resistor, the first end of the discharge resistor serves as the first end of the constant current source circuit, and the second end of the discharge resistor serves as the second end of the constant current source circuit.
3. The emergency lighting circuit of claim 2, wherein the constant current source circuit further comprises a first diode and an energy storage inductor, a first terminal of the adjustable resistor is connected to a first terminal of the energy storage inductor, a second terminal of the energy storage inductor is connected to a first terminal of the discharge resistor, a second terminal of the adjustable resistor is connected to a cathode of the first diode, and an anode of the first diode is connected to a second terminal of the first filter capacitor.
4. The emergency lighting circuit of claim 3, wherein the constant current source circuit further comprises a second filter capacitor, a first terminal of the second filter capacitor is connected to the second terminal of the energy storage inductor and the first terminal of the discharge resistor, and a second terminal of the filter capacitor is connected to the second terminal of the discharge resistor and the anode of the first diode.
5. The emergency lighting circuit according to any one of claims 2 to 4, wherein the constant current source circuit further comprises a fuse, and the rectifier bridge is connected to an external AC power source through the fuse.
6. The emergency lighting circuit of claim 1, wherein the first lamp bead load comprises more than two lamp beads, each of the lamp beads being connected in series.
7. The emergency lighting circuit of claim 1, wherein the second light bead load comprises a second diode and a light bead string, wherein an anode of the second diode serves as a first end of the second light bead load, a cathode of the second diode is connected to the first end of the light bead string, a common end of the second diode serves as a third end of the second light bead load, and a second end of the light bead string serves as a second end of the second light bead load.
8. The emergency lighting circuit according to claim 1, wherein the switch control device comprises a switch device, a pull-up resistor and a pull-down resistor, a first terminal of the pull-up resistor is used as the first terminal of the switch control device, a second terminal of the pull-up resistor is connected to the first terminal of the pull-down resistor and the control terminal of the switch device, a second terminal of the pull-down resistor is used as the fourth terminal of the switch control device, an input terminal of the switch device is used as the second terminal of the switch control device, and an output terminal of the switch device is used as the third terminal of the switch control device.
9. The emergency lighting circuit of claim 8, wherein the switching device is a transistor or a mosfet.
10. An emergency lighting device comprising the emergency lighting circuit of any one of claims 1-9.
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| CN202110683731.0A CN113438772B (en) | 2021-06-21 | 2021-06-21 | Emergency lighting circuit and device |
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| CN202110683731.0A CN113438772B (en) | 2021-06-21 | 2021-06-21 | Emergency lighting circuit and device |
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| CN113438772B CN113438772B (en) | 2022-10-18 |
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Cited By (1)
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| CN116634626A (en) * | 2023-01-16 | 2023-08-22 | 深圳新摩尔半导体有限公司 | Constant-current control circuit for LED lamp and LED lamp |
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| CN113438772B (en) | 2022-10-18 |
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