CN112087044B - Charging and discharging control circuit for charging lamp and LED emergency lamp - Google Patents

Charging and discharging control circuit for charging lamp and LED emergency lamp Download PDF

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Publication number
CN112087044B
CN112087044B CN202010946023.7A CN202010946023A CN112087044B CN 112087044 B CN112087044 B CN 112087044B CN 202010946023 A CN202010946023 A CN 202010946023A CN 112087044 B CN112087044 B CN 112087044B
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circuit
voltage
control circuit
power supply
power
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CN112087044A (en
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赵中华
朱朝军
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Xi'an New Moore Semiconductor Co ltd
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Xi'an New Moore Semiconductor Co ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/02Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which an auxiliary distribution system and its associated lamps are brought into service
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068Battery or charger load switching, e.g. concurrent charging and load supply
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04Regulation of charging current or voltage
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30Driver circuits
    • H05B45/345Current stabilisation; Maintaining constant current
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

An LED emergency lamp comprises an alternating current power supply positive input end, an alternating current power supply negative input end, a rectifier bridge circuit, a voltage transformation control circuit, a voltage transformation circuit, a light source switch circuit, a light source circuit, an energy storage circuit and a charge-discharge control circuit. The charging and discharging control circuit detects the switching times of a switch of an alternating current power supply which is not lost power within a preset time, and sends a switch closing signal to the light source switching circuit when the switching times within the preset time is a preset value, and sends a charging signal to the voltage transformation control circuit, the voltage transformation control circuit responds to the charging signal to convert direct current output by the rectifier bridge circuit into second high-voltage alternating current with high voltage and high frequency, and the voltage transformation circuit converts the second high-voltage alternating current into charging direct current to be output to the charging and discharging control circuit, so that the charging and discharging control circuit converts the charging direct current into constant current to charge the energy storage circuit. Because the lighting circuit is closed when the emergency lamp is charged, the charging time is reduced.

Description

Charging and discharging control circuit for charging lamp and LED emergency lamp
Technical Field
The invention relates to the technical field of illumination, in particular to a charging and discharging control circuit for a charging lamp and an LED emergency lamp.
Background
The emergency lamp is an important lighting device, automatically charges a backup battery when a main power supply is normally supplied, automatically switches the backup battery to supply power after the main power supply is lost, so as to provide emergency lighting, is widely applied to places with dense personnel, such as high-rise buildings, teaching buildings, markets, entertainment places and the like, is lighting equipment essential for safety protection, and plays an important role in the life of people, even is called as a life lamp. The LED lamp has the advantages of high efficiency, energy conservation, long service life, controllable low voltage and the like, and is widely applied to the field of emergency lamps.
At present, power driving chips of a charge-discharge control circuit of an existing LED emergency lamp are in a constant-current output working mode, namely, when different output voltages are applied, output currents are the same. When the LED emergency lamp adopts the low-power LED lamp bead as the light source, the output current ratio of the charge-discharge control circuit is small, and even if the LED emergency lamp charges the energy storage circuit by all the current in the lamp-off charging mode, the problem that the charging time of the LED emergency lamp is too long can be caused.
Disclosure of Invention
The invention mainly solves the technical problem that the charging time of the LED emergency lamp is too long.
According to a first aspect, an embodiment provides an LED emergency lamp, which includes an ac power positive input terminal, an ac power negative input terminal, a rectifier bridge circuit, a voltage transformation control circuit, a voltage transformation circuit, a light source switch circuit, a light source circuit, an energy storage circuit, and a charge and discharge control circuit:
the positive input end of the alternating current power supply and the negative input end of the alternating current power supply are connected with the rectifier bridge circuit and used for inputting the alternating current power supply;
the rectifier bridge circuit is connected with the voltage transformation control circuit and used for converting the input alternating current power supply into direct current and outputting the direct current to the voltage transformation control circuit;
the voltage transformation control circuit is connected with the voltage transformation circuit and is used for converting the direct current output by the rectifier bridge circuit into a first high-voltage alternating current with high voltage and high frequency;
the transformation circuit is connected with the light source switch circuit and is used for converting the first high-voltage alternating current output by the transformation control circuit into illumination direct current;
the light source switch circuit is connected with the light source circuit and used for responding to a switch conducting signal to conduct and/or responding to a switch closing signal to close; when the light source switch circuit is conducted, the lighting direct current is output to the light source circuit, so that a driving power supply is provided for the light source circuit;
the charging and discharging control circuit is connected with the positive input end of the alternating current power supply, the negative input end of the alternating current power supply, the light source switch circuit, the energy storage circuit, the light source circuit and the voltage transformation control circuit, and is used for detecting the switching times of the switch of the alternating current power supply which is not powered off within a preset time, sending a switch closing signal to the light source switch circuit when the switching times within the preset time are a preset value, and sending a charging signal to the voltage transformation control circuit;
the voltage transformation control circuit is also used for responding to the charging signal to convert the direct current output by the rectifier bridge circuit into a second high-voltage alternating current with high voltage and high frequency, and the voltage transformation circuit converts the second high-voltage alternating current output by the voltage transformation control circuit into a charging direct current to be output to the charging and discharging control circuit; the charging and discharging control circuit is also used for converting the charging direct current into a constant current to charge the energy storage circuit;
the energy storage circuit comprises an energy storage battery; the energy storage circuit is used for providing power for the charging and discharging control circuit when the alternating current power supply loses power, and the charging and discharging control circuit is also used for providing a driving power supply for the light source circuit when the alternating current power supply loses power.
In one embodiment, the charge and discharge control circuit comprises a constant current driving circuit, a switch power-off detection circuit, a control signal output circuit and a control circuit;
the switch power-off detection circuit is connected with the positive input end of the alternating-current power supply, the negative input end of the alternating-current power supply and the control signal output circuit, and is used for outputting a first reference voltage to the control signal output circuit when the alternating-current power supply is powered off; the switch power-off detection circuit is also used for detecting the switching times of the switch of the alternating current power supply which is not powered off within the preset time, and outputting a second reference voltage to the control signal output circuit when the switching times within the preset time is a preset value;
the control signal output circuit is connected with the control circuit and used for outputting a charging control signal to the control circuit when the switch power-off detection circuit outputs a first reference voltage and outputting a power-off control signal to the control circuit when the switch power-off detection circuit outputs a second reference voltage;
the control circuit is connected with the voltage transformation control circuit and the light source switch circuit and is used for responding to the charging control signal to send the switch closing signal to the light source switch circuit and send the charging signal to the voltage transformation control circuit;
the constant current driving circuit is connected with the transformation circuit and the energy storage circuit and is used for converting the charging direct current output by the transformation circuit into a constant current to charge the energy storage circuit.
In one embodiment, the switch power-off detection circuit comprises a first power supply connecting end, a second power supply connecting end, a live wire connecting end, a zero line connecting end, a first power-taking circuit, a second power-taking circuit, a comparison circuit and an analog switch control circuit;
the first power supply connecting end is used for connecting the positive input end of the alternating current power supply;
the second power supply connecting end is used for connecting the negative input end of the alternating current power supply;
the first power-taking circuit comprises a power supply connecting end and a voltage output end, the power supply connecting end of the first power-taking circuit is connected with the first power supply connecting end, and the voltage output end of the first power-taking circuit is connected with the comparison circuit and the analog switch control circuit; the first power taking circuit is used for acquiring a first input voltage signal input to the first power supply connecting end and respectively outputting the first input voltage signal to the comparison circuit and the analog switch control circuit;
the second power-taking circuit comprises a power supply connecting end and a voltage output end, the power supply connecting end of the second power-taking circuit is connected with the second power supply connecting end, and the voltage output end of the second power-taking circuit is connected with the comparison circuit and the analog switch control circuit; the second power taking circuit is used for acquiring a second input voltage signal input to the second power supply connecting end and respectively outputting the second input voltage signal to the comparison circuit and the analog switch control circuit;
the comparison circuit comprises a first voltage connecting end, a second voltage connecting end and a switch control connecting end, the first voltage connecting end is connected with the voltage output end of the first power taking circuit, the second voltage connecting end is connected with the voltage output end of the second power taking circuit, and the switch control connecting end is connected with the analog switch control circuit; the comparison circuit is used for acquiring a switch control signal according to the first input voltage signal and the second input voltage signal and outputting the acquired switch control signal to the analog switch control circuit;
the analog switch control circuit comprises a control signal input end, a first voltage connecting end, a second voltage connecting end, a live wire output end and a zero line output end, wherein the control signal input end of the analog switch control circuit is connected with the switch control connecting end, the first voltage connecting end of the analog switch control circuit is connected with the voltage output end of the first power taking circuit, the second voltage connecting end of the analog switch control circuit is connected with the voltage output end of the second power taking circuit, the live wire output end of the analog switch control circuit is connected with the live wire connecting end, and the zero line output end of the analog switch control circuit is connected with the zero line connecting end; when the switch control signal input by the control signal input end of the analog switch control circuit is a first preset voltage control signal, connecting the first voltage connecting end and the live wire output end of the analog switch control circuit, and connecting the second voltage connecting end and the zero line output end;
and when the switch control signal input by the control signal input end of the analog switch control circuit is a second preset voltage control signal, the first voltage connecting end and the zero line output end of the analog switch control circuit are connected, and the second voltage connecting end and the live line output end are connected.
In one embodiment, the first power-taking circuit includes a resistor R1, a resistor R2, and an analog switch K1; the resistor R1 is connected with the analog switch K1 in series, one end of the resistor R1 after the resistor R1 is connected with the voltage output end of the first power taking circuit in series, and the other end of the resistor R1 after the resistor R1 is connected with the voltage output end of the first power taking circuit in series; one end of the resistor R2 is connected with the power supply connecting end of the first power-taking circuit, and the other end of the resistor R2 is connected with the voltage output end of the first power-taking circuit;
and/or the second power-taking circuit comprises a resistor R3, a resistor R4 and an analog switch K2; the resistor R3 is connected with the analog switch K2 in series, one end of the resistor R3 after the resistor R3 is connected with the voltage output end of the second power taking circuit in series, and the other end of the resistor R3 after the resistor R3 is connected with the voltage output end of the second power taking circuit in series; one end of the resistor R4 is connected with the power supply connecting end of the second power-taking circuit, and the other end of the resistor R4 is connected with the voltage output end of the second power-taking circuit;
and/or the analog switch control circuit comprises two single-pole double-throw analog switches K0, wherein each single-pole double-throw analog switch K0 comprises a fixed end, a first movable end and a second movable end; the fixed end of the single-pole double-throw analog switch K0 is connected with the first voltage connecting end of the analog switch control circuit, the first movable end of the single-pole double-throw analog switch K0 is connected with the live wire output end, and the second movable end of the single-pole double-throw analog switch K0 is connected with the zero wire output end; the fixed end of the other single-pole double-throw analog switch K0 is connected with a second voltage connecting end of the analog switch control circuit, the second movable end of the single-pole double-throw analog switch K0 is connected with the live wire output end, and the first movable end of the single-pole double-throw analog switch K0 is connected with the zero wire output end;
and/or when a high-level signal is input to the control signal input end of the analog switch control circuit, the fixed end of each single-pole double-throw analog switch K0 is connected with the first movable end; and/or when a low-level signal is input to the control signal input end of the analog switch control circuit, the fixed end of each single-pole double-throw analog switch K0 is connected with the second movable end.
In one embodiment, the charge and discharge control circuit further comprises a starting circuit connected with the control circuit, the energy storage circuit and the light source circuit; the control circuit is also used for responding the power-off control signal and sending a starting illumination signal to the starting circuit; the starting circuit responds to the starting illumination signal, is connected with the energy storage circuit and the light source circuit and provides a driving power supply for the light source circuit.
In an embodiment, the charge and discharge control circuit further includes a reference voltage circuit, connected to the energy storage circuit and the switch power-off detection circuit, and configured to output the second reference voltage to the switch power-off detection circuit.
In one embodiment, the transformation circuit comprises a first transformer, a second transformer, a diode D31 and a diode D32; the connection ends of the two primary coils of the first transformer are connected with the voltage transformation control circuit and used for inputting the first high-voltage alternating current; one secondary coil connection end of the first transformer is connected with one end of the diode D31, the other secondary coil connection end of the first transformer is grounded, and the other end of the diode D31 is connected with the light source circuit;
the connection ends of the two primary coils of the second transformer are connected with the voltage transformation control circuit and used for inputting the second high-voltage alternating current; one secondary coil connecting end of the second transformer is connected with one end of the diode D32, the other secondary coil connecting end of the second transformer is grounded, and the other end of the diode D32 is connected with the charge and discharge control circuit.
According to a second aspect, an embodiment provides a charge and discharge control circuit for a charging lamp, which includes an ac power positive input terminal, an ac power negative input terminal, a constant current driving circuit, a switch power-off detection circuit, a control signal output circuit and a control circuit;
the positive input end of the alternating current power supply and the negative input end of the alternating current power supply are used for inputting the alternating current power supply of the charging lamp;
the switch power-off detection circuit is connected with the positive input end of the alternating current power supply of the charging lamp, the negative input end of the alternating current power supply and the control signal output circuit, and is used for outputting a first reference voltage to the control signal output circuit when the alternating current power supply is powered off; the switch power-off detection circuit is also used for detecting the switching times of the switch of the alternating current power supply which is not powered off within the preset time, and outputting a second reference voltage to the control signal output circuit when the switching times within the preset time is a preset value;
the control signal output circuit is connected with the control circuit and used for outputting a charging control signal to the control circuit when the switch power-off detection circuit outputs a first reference voltage and outputting a power-off control signal to the control circuit when the switch power-off detection circuit outputs a second reference voltage;
the charging lamp comprises a light source switch circuit, is connected with the light source circuit of the charging lamp and is used for responding to a switch closing signal to close the driving power supply of the light source circuit;
the control circuit is connected with the light source switch circuit and used for responding to the charging control signal, sending the switch closing signal to the light source switch circuit and sending a charging signal to the constant current driving circuit;
the constant current driving circuit is connected with the transformation circuit and the energy storage circuit of the charging lamp and used for responding the charging signal to convert the charging direct current output by the transformation circuit of the charging lamp into constant current to charge the energy storage circuit.
In one embodiment, the charging circuit further comprises a reference voltage circuit, connected to the energy storage circuit of the charging lamp and the switch power-off detection circuit, for outputting the second reference voltage to the switch power-off detection circuit.
In one embodiment, the lighting device further comprises a starting circuit connected with the control circuit, the energy storage circuit and the light source circuit; the control circuit is also used for responding the power-off control signal and sending a starting illumination signal to the starting circuit; the starting circuit responds to the starting illumination signal, is connected with the energy storage circuit and the light source circuit and provides a driving power supply for the light source circuit.
According to the embodiment, the emergency lamp comprises an alternating current power supply positive input end, an alternating current power supply negative input end, a rectifier bridge circuit, a transformation control circuit, a transformation circuit, a light source switch circuit, a light source circuit, an energy storage circuit and a charging and discharging control circuit. The charging and discharging control circuit detects the switching times of a switch of an alternating current power supply which is not lost power within a preset time, and sends a switch closing signal to the light source switching circuit when the switching times within the preset time is a preset value, and sends a charging signal to the voltage transformation control circuit, the voltage transformation control circuit responds to the charging signal to convert direct current output by the rectifier bridge circuit into second high-voltage alternating current with high voltage and high frequency, and the voltage transformation circuit converts the second high-voltage alternating current into charging direct current to be output to the charging and discharging control circuit, so that the charging and discharging control circuit converts the charging direct current into constant current to charge the energy storage circuit. Because the lighting circuit is closed when the emergency lamp is charged, the charging time is reduced.
Drawings
FIG. 1 is a schematic diagram of a structural connection of an LED emergency light according to an embodiment;
FIG. 2 is a schematic diagram illustrating a structural connection of a charge/discharge control circuit according to an embodiment;
FIG. 3 is a schematic diagram illustrating a structural connection of a power-down detection circuit of the switch according to an embodiment;
FIG. 4 is a circuit diagram of an embodiment of a switch loss of power detection circuit;
fig. 5 is a schematic circuit diagram of an LED emergency lamp according to an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
The charging and discharging control circuit of the charging lamp needs to detect the power failure and the power switch state of the power supply, so that the connection of the zero line connecting end and the live line connecting end of the power input end of the charging lamp is required to be correct, otherwise misjudgment during power failure detection or power switch state detection can be caused, and further the work of the emergency lamp is abnormal. For example, if the charging lamp is continuously switched on and off twice to control the power control switch, the light source is turned off and the energy storage circuit of the charging lamp is charged when the power supply is not powered off, and when the zero line connecting end and the live line connecting end of the charging lamp are reversely connected, the charging and discharging control circuit cannot detect the turning-off action of the power control switch, and the lamp-off charging cannot be realized. For another example, if the power connection ends of a plurality of emergency lamps connected in parallel under the same power supply are reversely connected, when the power supply is powered off, the emergency lamps with the reversely connected power connection ends can output interference electric signals mutually to interfere the power-off detection of the charge and discharge control circuit, and then the power-off emergency signals cannot be sent out, so that the emergency lamps lose the power-off lamp-turning-on function.
In the embodiment of the invention, the charging and discharging control circuit of the emergency lamp detects the switching times of the switch of the alternating current power supply which is not lost, the switching times within the preset time are a preset value, a switch closing signal is sent to the light source switching circuit, a charging signal is sent to the voltage transformation control circuit, the voltage transformation control circuit responds to the charging signal to convert the direct current output by the rectifier bridge circuit into the second high-voltage alternating current with high voltage and high frequency, the second high-voltage alternating current is converted into the charging direct current by the voltage transformation circuit and is output to the charging and discharging control circuit, and the charging and discharging control circuit converts the charging direct current into the constant current to charge the energy storage circuit. Because the lighting circuit is closed when the emergency lamp is charged, the charging time is reduced.
Example one
Referring to fig. 1, a schematic diagram of a structural connection of an LED emergency lamp in an embodiment is shown, where the LED emergency lamp includes an ac power positive input end ACL, an ac power negative input end ACN, a rectifier bridge circuit 1, a voltage transformation control circuit 2, a voltage transformation circuit 3, a light source switch circuit 6, a light source circuit 7, an energy storage circuit 5, and a charging and discharging control circuit 4. The positive input end ACL of the ac power supply and the negative input end ACN of the ac power supply are connected to the rectifier bridge circuit 1 for input of the ac power supply 8. The rectifier bridge circuit 1 is connected with the voltage transformation control circuit 2 and used for converting an input alternating current power supply into direct current and outputting the direct current to the voltage transformation control circuit 2. The voltage transformation control circuit 2 is connected with the voltage transformation circuit 3 and is used for converting the direct current output by the rectifier bridge circuit 1 into a first high-voltage alternating current with high voltage and high frequency. The voltage transformation circuit 3 is connected with the light source switch circuit 6 and is used for converting the first high-voltage alternating current output by the voltage transformation control circuit 2 into illumination direct current. The light source switch circuit 6 is connected to the light source circuit 7 and is turned on in response to a switch-on signal and/or turned off in response to a switch-off signal. When the light source switch circuit 6 is turned on, it outputs a direct illumination current to the light source circuit 7 to supply a driving power source to the light source circuit 7. The charging and discharging control circuit 4 is connected with the positive input end ACL of the alternating current power supply, the negative input end ACN of the alternating current power supply, the light source switch circuit 6, the energy storage circuit 5, the light source circuit 7 and the voltage transformation control circuit 2, and is used for detecting the switching times of the switch S1 of the alternating current power supply 8 which is not power-lost in a preset time, sending a switch closing signal to the light source switch circuit 6 when the switching times of the switch S1 in the preset time is a preset value, and sending a charging signal to the voltage transformation control circuit 2. The voltage transformation control circuit 2 is also used for responding to the charging signal to convert the direct current output by the rectifier bridge circuit 1 into a high-voltage high-frequency second high-voltage alternating current, and the voltage transformation circuit 3 converts the second high-voltage alternating current output by the voltage transformation control circuit 2 into a charging direct current and outputs the charging direct current to the charging and discharging control circuit 4. The charging and discharging control circuit 4 is also used for converting the charging direct current into a constant current to charge the energy storage circuit 5. The energy storage circuit 5 includes an energy storage battery. The energy storage circuit 5 is used for providing power for the charge and discharge control circuit 4 when the alternating current power supply 8 is in power failure, and the charge and discharge control circuit 4 is also used for providing a driving power for the light source circuit 7 when the alternating current power supply 8 is in power failure.
Referring to fig. 2, which is a schematic diagram illustrating a structural connection of the charge and discharge control circuit in an embodiment, the charge and discharge control circuit 4 includes a constant current driving circuit 43, a switch power-off detection circuit 41, a control signal output circuit 45, and a control circuit 40. The switch power-loss detection circuit 41 is connected to the ac power supply positive input end ACL, the ac power supply negative input end ACN, and the control signal output circuit 45, and is configured to output a first reference voltage to the control signal output circuit 45 when the ac power supply 8 loses power. The switch power-loss detection circuit 41 is further configured to detect a switching time of the switch S1 of the ac power supply 8 that is not powered-loss within a preset time, and output a second reference voltage to the control signal output circuit 45 when the switching time within the preset time is a preset value. The control signal output circuit 45 is connected to the control circuit 40, and is configured to output a charging control signal to the control circuit 40 when the switch power-off detection circuit 41 outputs the first reference voltage, and output a power-off control signal to the control circuit 40 when the switch power-off detection circuit 41 outputs the second reference voltage. The control circuit 40 is connected to the voltage transformation control circuit 2 and the light source switch circuit 6, and is configured to send a switch-off signal to the light source switch circuit 6 in response to the charging control signal, and send a charging signal to the voltage transformation control circuit 2. The constant current driving circuit 43 is connected to the voltage transformation circuit 3 and the energy storage circuit 5, and is configured to convert the charging direct current output by the voltage transformation circuit 3 into a constant current to charge the energy storage circuit 5.
In one embodiment, the charging and discharging control circuit 4 further includes a start circuit 42 connected to the control circuit 40, the energy storage circuit 5 and the light source circuit 7. The control circuit 40 is further configured to send an illumination start signal to the start circuit 42 in response to the power loss control signal, and the start circuit 42 connects the energy storage circuit 5 and the light source circuit 7 in response to the illumination start signal and provides a driving power supply for the light source circuit 7. In an embodiment, the charging and discharging control circuit 4 further includes a reference voltage circuit 44, connected to the energy storage circuit 5 and the switch power-off detection circuit 41, for outputting a second reference voltage to the switch power-off detection circuit 41.
Referring to fig. 3, which is a schematic diagram illustrating a structural connection of the switch power-off detection circuit in an embodiment, the switch power-off detection circuit 41 includes a first power connection terminal, a second power connection terminal, a live connection terminal, a neutral connection terminal, a first power-taking circuit 412, a second power-taking circuit 413, a comparison circuit 411, and an analog switch control circuit 414. The first power supply connecting end is used for connecting the positive input end of the alternating current power supply, and the second power supply connecting end is used for connecting the negative input end of the alternating current power supply. The first power-taking circuit 412 includes a power connection terminal and a voltage output terminal, the power connection terminal of the first power-taking circuit 412 is connected to the first power connection terminal, and the voltage output terminal of the first power-taking circuit 412 is connected to the comparison circuit 411 and the analog switch control circuit 414. The first power-taking circuit 412 is configured to obtain a first input voltage signal input to the first power connection terminal, and output the first input voltage signal to the comparison circuit 411 and the analog switch control circuit 414, respectively. The second power-taking circuit 413 comprises a power connection end and a voltage output end, the power connection end of the second power-taking circuit 413 is connected with the second power connection end, and the voltage output end of the second power-taking circuit 413 is connected with the comparison circuit 411 and the analog switch control circuit 414. The second power-taking circuit 413 is configured to obtain a second input voltage signal input to the second power connection terminal, and output the second input voltage signal to the comparison circuit 411 and the analog switch control circuit 414, respectively. The comparison circuit 411 includes a first voltage connection terminal, a second voltage connection terminal and a switch control connection terminal, the first voltage connection terminal is connected to the voltage output terminal of the first power-taking circuit 412, the second voltage connection terminal is connected to the voltage output terminal of the second power-taking circuit 413, and the switch control connection terminal is connected to the analog switch control circuit 414. The comparing circuit 411 is configured to obtain a switch control signal according to the first input voltage signal and the second input voltage signal, and output the obtained switch control signal to the analog switch control circuit 414.
The analog switch control circuit 414 comprises a control signal input end, a first voltage connecting end, a second voltage connecting end, a live wire output end and a zero line output end, the control signal input end of the analog switch control circuit 414 is connected with the switch control connecting end, the first voltage connecting end of the analog switch control circuit 414 is connected with the voltage output end of the first power taking circuit 412, the second voltage connecting end of the analog switch control circuit 414 is connected with the voltage output end of the second power taking circuit 413, the live wire output end of the analog switch control circuit 414 is connected with the live wire connecting end, and the zero line output end of the analog switch control circuit 414 is connected with the zero line connecting end. When the switch control signal input from the control signal input terminal of the analog switch control circuit 414 is the first preset voltage control signal, the first voltage connection terminal and the live wire output terminal of the analog switch control circuit 414 are connected, and the second voltage connection terminal and the neutral wire output terminal are connected. When the switch control signal input from the control signal input terminal of the analog switch control circuit 414 is the second preset voltage control signal, the first voltage connection terminal and the zero line output terminal of the analog switch control circuit 414 are connected, and the second voltage connection terminal and the live line output terminal are connected.
Referring to fig. 4, which is a circuit diagram of an embodiment of a switch power-off detection circuit, the first power circuit 412 includes a resistor R1, a resistor R2, and an analog switch K1. The resistor R1 is connected in series with the analog switch K1, one end of the series connection is connected to the voltage output end of the first power supply circuit 412, and the other end of the series connection is grounded. One end of the resistor R2 is connected to the power connection end of the first power-taking circuit 412, and the other end is connected to the voltage output end of the first power-taking circuit 412. The second power-taking circuit 413 comprises a resistor R3, a resistor R4 and an analog switch K2. The resistor R3 is connected in series with the analog switch K2, one end of the series connection is connected to the voltage output end of the second power supply circuit 413, and the other end of the series connection is grounded. One end of the resistor R4 is connected to the power connection end of the second power-taking circuit 413, and the other end is connected to the voltage output end of the second power-taking circuit 413. The analog switch control circuit 414 includes two single pole double throw analog switches K0, each of which single pole double throw analog switches K0 includes a stationary terminal, a first movable terminal and a second movable terminal. The fixed end of a single-pole double-throw analog switch K0 is connected with the first voltage connecting end of the analog switch control circuit 414, the first movable end of the single-pole double-throw analog switch K0 is connected with the live wire output end, and the second movable end of the single-pole double-throw analog switch K0 is connected with the zero line output end; the fixed end of another single-pole double-throw analog switch K0 is connected with the second voltage connecting end of the analog switch control circuit 414, the second movable end of the single-pole double-throw analog switch K0 is connected with the live wire output end, and the first movable end of the single-pole double-throw analog switch K0 is connected with the zero wire output end. When a high-level signal is input to the control signal input terminal of the analog switch control circuit 414, the stationary terminal of each single-pole double-throw analog switch K0 is connected to the first moving terminal. When a low-level signal is input to the control signal input terminal of the analog switch control circuit 414, the stationary terminal of each single-pole double-throw analog switch K0 is connected to the second moving terminal.
Referring to fig. 5, a schematic circuit diagram of an embodiment of an LED emergency lamp includes a rectifier bridge circuit 1, a transformation control circuit 2, a transformation circuit 3, a light source switch circuit 6, a light source circuit 7, an energy storage circuit 5, and a charging/discharging control circuit 4. The transformation control circuit 2 comprises a control chip IC21, the charge and discharge control circuit 4 comprises a control chip IC41, and the transformation circuit 3 comprises a first transformer T31, a second transformer T32, a diode D31 and a diode D32. Two primary coil connecting ends of the first transformer T31 are connected to the voltage transformation control circuit 2, and are used for inputting the first high-voltage alternating current. One secondary coil connection terminal of the first transformer T31 is connected to one terminal of the diode D31, the other secondary coil connection terminal of the first transformer T31 is grounded, and the other terminal of the diode D31 is connected to the light source circuit 7. Two primary coil connecting ends of the second transformer T32 are connected to the voltage transformation control circuit 2, and are used for inputting the second high-voltage alternating current. One secondary coil connection terminal of the second transformer T32 is connected to one terminal of the diode D32, the other secondary coil connection terminal of the second transformer T32 is grounded, and the other terminal of the diode D32 is connected to the charge/discharge control circuit 4.
In the embodiment of the application, the LED emergency lamp includes an ac power positive input terminal, an ac power negative input terminal, a rectifier bridge circuit, a voltage transformation control circuit, a voltage transformation circuit, a light source switch circuit, a light source circuit, an energy storage circuit, and a charge and discharge control circuit. The charging and discharging control circuit detects the switching times of a switch of an alternating current power supply which is not lost power within a preset time, and sends a switch closing signal to the light source switching circuit when the switching times within the preset time is a preset value, and sends a charging signal to the voltage transformation control circuit, the voltage transformation control circuit responds to the charging signal to convert direct current output by the rectifier bridge circuit into second high-voltage alternating current with high voltage and high frequency, and the voltage transformation circuit converts the second high-voltage alternating current into charging direct current to be output to the charging and discharging control circuit, so that the charging and discharging control circuit converts the charging direct current into constant current to charge the energy storage circuit. Because the lighting circuit is closed when the emergency lamp is charged, the charging time is reduced.
As shown in fig. 2, the present application further discloses a charge and discharge control circuit for a rechargeable lamp, wherein the charge and discharge control circuit 4 includes an ac power positive input terminal ACL, an ac power negative input terminal ACN, a constant current driving circuit 43, a switch power-off detection circuit 41, a control signal output circuit 45, and a control circuit 40. The ac power positive input terminal ACL and the ac power negative input terminal ACN are used for input of the ac power of the charging lamp. The switch power-loss detection circuit 41 is connected to the positive input end of the ac power supply of the charging lamp, the negative input end of the ac power supply and the control signal output circuit 45, and is configured to output a first reference voltage to the control signal output circuit 45 when the ac power supply 8 loses power. The switch power-loss detection circuit 41 is further configured to detect a switching time of the switch S1 of the ac power supply 8 that is not powered-loss within a preset time, and output a second reference voltage to the control signal output circuit 45 when the switching time within the preset time is a preset value. The control signal output circuit 45 is connected to the control circuit 40, and is configured to output a charging control signal to the control circuit 40 when the switch power-off detection circuit 41 outputs the first reference voltage, and output a power-off control signal to the control circuit 40 when the switch power-off detection circuit 41 outputs the second reference voltage. The charging lamp includes a light source switching circuit 6 connected to a light source circuit 7 of the charging lamp for turning off a driving power of the light source circuit 7 in response to a switching-off signal. The control circuit 40 is connected to the light source switching circuit 6, and is configured to send a switch-off signal to the light source switching circuit 6 in response to the charging control signal, and send a charging signal to the constant current driving circuit 43. The constant current driving circuit 43 is connected to the voltage transformation circuit 3 and the energy storage circuit 5 of the charging lamp, and is configured to convert the charging direct current output by the voltage transformation circuit 3 of the charging lamp into a constant current to charge the energy storage circuit 5 in response to the charging signal. The charging and discharging control circuit 4 further includes a reference voltage circuit 44, connected to the energy storage circuit 5 of the charging lamp and the switch power-off detection circuit 41, for outputting a second reference voltage to the switch power-off detection circuit 41. The charging and discharging control circuit 4 further comprises a starting circuit 42 connected with the control circuit 40, the energy storage circuit 5 and the light source circuit 7. The control circuit 40 is also operable to send an enable illumination signal to the enable circuit 42 in response to the power loss control signal. The starting circuit 42 connects the tank circuit 5 and the light source circuit 7 in response to a starting illumination signal, and supplies a driving power to the light source circuit 7. The charge and discharge control circuit disclosed in this embodiment supports all switching type LED driving schemes. As shown in fig. 5, the charge/discharge control circuit 4 includes a control chip IC41, and the control chip IC41 detects a switching signal by CLK to determine whether to enter a lamp-off charging mode for charging the lamp. In the lamp-off charging mode, the constant current driving circuit 43 outputs a stable voltage to the rechargeable battery of the energy storage circuit 5, the light source switching circuit 6 is controlled by the control chip IC41 to turn off the switching tube Q61, the output circuit of the light source circuit 7 is disconnected, and the lighting of the rechargeable lamp is turned off. Meanwhile, the LGL of the control chip IC41 controls the constant current driving circuit 43 to drive the current to increase, so that the large current charging for the energy storage circuit 5 is maintained, the charging time is reduced, and the maximum performance is obtained at the lowest cost.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.

Claims (8)

1. The utility model provides a LED emergency light, its characterized in that, includes that alternating current power supply positive input, alternating current power supply negative input, rectifier bridge circuit, vary voltage control circuit, vary voltage circuit, light source switch circuit, light source circuit, energy storage circuit and charge-discharge control circuit:
the positive input end of the alternating current power supply and the negative input end of the alternating current power supply are connected with the rectifier bridge circuit and used for inputting the alternating current power supply;
the rectifier bridge circuit is connected with the voltage transformation control circuit and used for converting the input alternating current power supply into direct current and outputting the direct current to the voltage transformation control circuit;
the voltage transformation control circuit is connected with the voltage transformation circuit and is used for converting the direct current output by the rectifier bridge circuit into a first high-voltage alternating current with high voltage and high frequency;
the transformation circuit is connected with the light source switch circuit and is used for converting the first high-voltage alternating current output by the transformation control circuit into illumination direct current;
the light source switch circuit is connected with the light source circuit and used for responding to a switch conducting signal to conduct and/or responding to a switch closing signal to close; when the light source switch circuit is conducted, the lighting direct current is output to the light source circuit, so that a driving power supply is provided for the light source circuit;
the charging and discharging control circuit is connected with the positive input end of the alternating current power supply, the negative input end of the alternating current power supply, the light source switch circuit, the energy storage circuit, the light source circuit and the voltage transformation control circuit, and is used for detecting the switching times of the switch of the alternating current power supply which is not powered off within a preset time, sending a switch closing signal to the light source switch circuit when the switching times within the preset time are a preset value, and sending a charging signal to the voltage transformation control circuit;
the voltage transformation control circuit is also used for responding to the charging signal to convert the direct current output by the rectifier bridge circuit into a second high-voltage alternating current with high voltage and high frequency, and the voltage transformation circuit converts the second high-voltage alternating current output by the voltage transformation control circuit into a charging direct current to be output to the charging and discharging control circuit; the charging and discharging control circuit is also used for converting the charging direct current into a constant current to charge the energy storage circuit;
the energy storage circuit comprises an energy storage battery; the energy storage circuit is used for providing power for the charging and discharging control circuit when the alternating current power supply loses power, and the charging and discharging control circuit is also used for providing a driving power supply for the light source circuit when the alternating current power supply loses power;
the charge and discharge control circuit comprises a constant current driving circuit, a switch power-off detection circuit, a control signal output circuit and a control circuit;
the switch power-off detection circuit is connected with the positive input end of the alternating-current power supply, the negative input end of the alternating-current power supply and the control signal output circuit, and is used for outputting a first reference voltage to the control signal output circuit when the alternating-current power supply is powered off; the switch power-off detection circuit is also used for detecting the switching times of the switch of the alternating current power supply which is not powered off within the preset time, and outputting a second reference voltage to the control signal output circuit when the switching times within the preset time is a preset value;
the control signal output circuit is connected with the control circuit and used for outputting a charging control signal to the control circuit when the switch power-off detection circuit outputs a first reference voltage and outputting a power-off control signal to the control circuit when the switch power-off detection circuit outputs a second reference voltage;
the control circuit is connected with the voltage transformation control circuit and the light source switch circuit and is used for responding to the charging control signal to send the switch closing signal to the light source switch circuit and send the charging signal to the voltage transformation control circuit;
the constant current driving circuit is connected with the voltage transformation circuit and the energy storage circuit and is used for converting the charging direct current output by the voltage transformation circuit into a constant current to charge the energy storage circuit;
the switch power-off detection circuit comprises a first power supply connecting end, a second power supply connecting end, a live wire connecting end, a zero line connecting end, a first power taking circuit, a second power taking circuit, a comparison circuit and an analog switch control circuit;
the first power supply connecting end is used for connecting the positive input end of the alternating current power supply;
the second power supply connecting end is used for connecting the negative input end of the alternating current power supply;
the first power-taking circuit comprises a power supply connecting end and a voltage output end, the power supply connecting end of the first power-taking circuit is connected with the first power supply connecting end, and the voltage output end of the first power-taking circuit is connected with the comparison circuit and the analog switch control circuit; the first power taking circuit is used for acquiring a first input voltage signal input to the first power supply connecting end and respectively outputting the first input voltage signal to the comparison circuit and the analog switch control circuit;
the second power-taking circuit comprises a power supply connecting end and a voltage output end, the power supply connecting end of the second power-taking circuit is connected with the second power supply connecting end, and the voltage output end of the second power-taking circuit is connected with the comparison circuit and the analog switch control circuit; the second power taking circuit is used for acquiring a second input voltage signal input to the second power supply connecting end and respectively outputting the second input voltage signal to the comparison circuit and the analog switch control circuit;
the comparison circuit comprises a first voltage connecting end, a second voltage connecting end and a switch control connecting end, the first voltage connecting end is connected with the voltage output end of the first power taking circuit, the second voltage connecting end is connected with the voltage output end of the second power taking circuit, and the switch control connecting end is connected with the analog switch control circuit; the comparison circuit is used for acquiring a switch control signal according to the first input voltage signal and the second input voltage signal and outputting the acquired switch control signal to the analog switch control circuit;
the analog switch control circuit comprises a control signal input end, a first voltage connecting end, a second voltage connecting end, a live wire output end and a zero line output end, wherein the control signal input end of the analog switch control circuit is connected with the switch control connecting end, the first voltage connecting end of the analog switch control circuit is connected with the voltage output end of the first power taking circuit, the second voltage connecting end of the analog switch control circuit is connected with the voltage output end of the second power taking circuit, the live wire output end of the analog switch control circuit is connected with the live wire connecting end, and the zero line output end of the analog switch control circuit is connected with the zero line connecting end; when the switch control signal input by the control signal input end of the analog switch control circuit is a first preset voltage control signal, connecting the first voltage connecting end and the live wire output end of the analog switch control circuit, and connecting the second voltage connecting end and the zero line output end;
and when the switch control signal input by the control signal input end of the analog switch control circuit is a second preset voltage control signal, the first voltage connecting end and the zero line output end of the analog switch control circuit are connected, and the second voltage connecting end and the live line output end are connected.
2. The LED emergency lamp according to claim 1, wherein the first power supply circuit comprises a resistor R1, a resistor R2, an analog switch K1; the resistor R1 is connected with the analog switch K1 in series, one end of the resistor R1 after the resistor R1 is connected with the voltage output end of the first power taking circuit in series, and the other end of the resistor R1 after the resistor R1 is connected with the voltage output end of the first power taking circuit in series; one end of the resistor R2 is connected with the power supply connecting end of the first power-taking circuit, and the other end of the resistor R2 is connected with the voltage output end of the first power-taking circuit;
and/or the second power-taking circuit comprises a resistor R3, a resistor R4 and an analog switch K2; the resistor R3 is connected with the analog switch K2 in series, one end of the resistor R3 after the resistor R3 is connected with the voltage output end of the second power taking circuit in series, and the other end of the resistor R3 after the resistor R3 is connected with the voltage output end of the second power taking circuit in series; one end of the resistor R4 is connected with the power supply connecting end of the second power-taking circuit, and the other end of the resistor R4 is connected with the voltage output end of the second power-taking circuit;
and/or the analog switch control circuit comprises two single-pole double-throw analog switches K0, wherein each single-pole double-throw analog switch K0 comprises a fixed end, a first movable end and a second movable end; the fixed end of the single-pole double-throw analog switch K0 is connected with the first voltage connecting end of the analog switch control circuit, the first movable end of the single-pole double-throw analog switch K0 is connected with the live wire output end, and the second movable end of the single-pole double-throw analog switch K0 is connected with the zero wire output end; the fixed end of the other single-pole double-throw analog switch K0 is connected with a second voltage connecting end of the analog switch control circuit, the second movable end of the single-pole double-throw analog switch K0 is connected with the live wire output end, and the first movable end of the single-pole double-throw analog switch K0 is connected with the zero wire output end;
and/or when a high-level signal is input to the control signal input end of the analog switch control circuit, the fixed end of each single-pole double-throw analog switch K0 is connected with the first movable end; and/or when a low-level signal is input to the control signal input end of the analog switch control circuit, the fixed end of each single-pole double-throw analog switch K0 is connected with the second movable end.
3. The LED emergency lamp of claim 1, wherein the charge and discharge control circuit further comprises a start circuit connected to the control circuit, the tank circuit, and the light source circuit; the control circuit is also used for responding the power-off control signal and sending a starting illumination signal to the starting circuit; the starting circuit responds to the starting illumination signal, is connected with the energy storage circuit and the light source circuit and provides a driving power supply for the light source circuit.
4. The LED emergency lamp of claim 1, wherein the charge and discharge control circuit further comprises a reference voltage circuit connected to the energy storage circuit and the switch loss of power detection circuit for outputting the second reference voltage to the switch loss of power detection circuit.
5. The LED emergency lamp of claim 1, wherein the transformation circuit comprises a first transformer, a second transformer and diodes D31 and D32; the connection ends of the two primary coils of the first transformer are connected with the voltage transformation control circuit and used for inputting the first high-voltage alternating current; one secondary coil connection end of the first transformer is connected with one end of the diode D31, the other secondary coil connection end of the first transformer is grounded, and the other end of the diode D31 is connected with the light source circuit;
the connection ends of the two primary coils of the second transformer are connected with the voltage transformation control circuit and used for inputting the second high-voltage alternating current; one secondary coil connecting end of the second transformer is connected with one end of the diode D32, the other secondary coil connecting end of the second transformer is grounded, and the other end of the diode D32 is connected with the charge and discharge control circuit.
6. A charge-discharge control circuit for a charging lamp is characterized by comprising an alternating current power supply positive input end, an alternating current power supply negative input end, a constant current driving circuit, a switch power-off detection circuit, a control signal output circuit and a control circuit;
the positive input end of the alternating current power supply and the negative input end of the alternating current power supply are used for inputting the alternating current power supply of the charging lamp;
the switch power-off detection circuit is connected with the positive input end of the alternating current power supply of the charging lamp, the negative input end of the alternating current power supply and the control signal output circuit, and is used for outputting a first reference voltage to the control signal output circuit when the alternating current power supply is powered off; the switch power-off detection circuit is also used for detecting the switching times of the switch of the alternating current power supply which is not powered off within the preset time, and outputting a second reference voltage to the control signal output circuit when the switching times within the preset time is a preset value;
the control signal output circuit is connected with the control circuit and used for outputting a charging control signal to the control circuit when the switch power-off detection circuit outputs a first reference voltage and outputting a power-off control signal to the control circuit when the switch power-off detection circuit outputs a second reference voltage;
the charging lamp comprises a light source switch circuit, is connected with the light source circuit of the charging lamp and is used for responding to a switch closing signal to close the driving power supply of the light source circuit;
the control circuit is connected with the light source switch circuit and used for responding to the charging control signal, sending the switch closing signal to the light source switch circuit and sending a charging signal to the constant current driving circuit;
the constant current driving circuit is connected with the transformation circuit and the energy storage circuit of the charging lamp and is used for responding to the charging signal to convert the charging direct current output by the transformation circuit of the charging lamp into a constant current to charge the energy storage circuit;
the switch power-off detection circuit comprises a first power supply connecting end, a second power supply connecting end, a live wire connecting end, a zero line connecting end, a first power taking circuit, a second power taking circuit, a comparison circuit and an analog switch control circuit;
the first power supply connecting end is used for connecting the positive input end of the alternating current power supply;
the second power supply connecting end is used for connecting the negative input end of the alternating current power supply;
the first power-taking circuit comprises a power supply connecting end and a voltage output end, the power supply connecting end of the first power-taking circuit is connected with the first power supply connecting end, and the voltage output end of the first power-taking circuit is connected with the comparison circuit and the analog switch control circuit; the first power taking circuit is used for acquiring a first input voltage signal input to the first power supply connecting end and respectively outputting the first input voltage signal to the comparison circuit and the analog switch control circuit;
the second power-taking circuit comprises a power supply connecting end and a voltage output end, the power supply connecting end of the second power-taking circuit is connected with the second power supply connecting end, and the voltage output end of the second power-taking circuit is connected with the comparison circuit and the analog switch control circuit; the second power taking circuit is used for acquiring a second input voltage signal input to the second power supply connecting end and respectively outputting the second input voltage signal to the comparison circuit and the analog switch control circuit;
the comparison circuit comprises a first voltage connecting end, a second voltage connecting end and a switch control connecting end, the first voltage connecting end is connected with the voltage output end of the first power taking circuit, the second voltage connecting end is connected with the voltage output end of the second power taking circuit, and the switch control connecting end is connected with the analog switch control circuit; the comparison circuit is used for acquiring a switch control signal according to the first input voltage signal and the second input voltage signal and outputting the acquired switch control signal to the analog switch control circuit;
the analog switch control circuit comprises a control signal input end, a first voltage connecting end, a second voltage connecting end, a live wire output end and a zero line output end, wherein the control signal input end of the analog switch control circuit is connected with the switch control connecting end, the first voltage connecting end of the analog switch control circuit is connected with the voltage output end of the first power taking circuit, the second voltage connecting end of the analog switch control circuit is connected with the voltage output end of the second power taking circuit, the live wire output end of the analog switch control circuit is connected with the live wire connecting end, and the zero line output end of the analog switch control circuit is connected with the zero line connecting end; when the switch control signal input by the control signal input end of the analog switch control circuit is a first preset voltage control signal, connecting the first voltage connecting end and the live wire output end of the analog switch control circuit, and connecting the second voltage connecting end and the zero line output end;
and when the switch control signal input by the control signal input end of the analog switch control circuit is a second preset voltage control signal, the first voltage connecting end and the zero line output end of the analog switch control circuit are connected, and the second voltage connecting end and the live line output end are connected.
7. The charge and discharge control circuit of claim 6 further comprising a reference voltage circuit coupled to the energy storage circuit of the charge lamp and the switch loss of power detection circuit for outputting the second reference voltage to the switch loss of power detection circuit.
8. The charge and discharge control circuit of claim 7 further comprising a startup circuit connected to the control circuit, the tank circuit, and the light source circuit; the control circuit is also used for responding the power-off control signal and sending a starting illumination signal to the starting circuit; the starting circuit responds to the starting illumination signal, is connected with the energy storage circuit and the light source circuit and provides a driving power supply for the light source circuit.
CN202010946023.7A 2020-09-10 2020-09-10 Charging and discharging control circuit for charging lamp and LED emergency lamp Active CN112087044B (en)

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Inventor after: Zhao Zhonghua

Inventor after: Zhu Chaojun

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