CN214413083U - Discharge time prolonging circuit for emergency lighting of floating type LED lamp tube - Google Patents
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Abstract
The utility model provides a floating ground type LED fluorescent tube emergency lighting's discharge time extension circuit, including constant current drive circuit, voltage discrimination circuit, alternating current power supply and LED fluorescent tube, wherein: the alternating current power supply is used for supplying power to the constant current driving circuit and the LED lamp tube; the constant current driving circuit is connected with an alternating current power supply and then used for controlling the opening or closing of the LED lamp tube, and the constant current driving circuit adopts a voltage reduction type driving circuit, a voltage increase type driving circuit and a voltage increase and decrease type driving circuit; the voltage judging circuit is connected with the constant current driving circuit and then used for controlling the constant current value, the output power and the discharging time of the LED lamp tube according to the power supply state of the alternating current power supply and the power supply state. The utility model discloses a circuit is differentiateed to voltage, reduces output current when emergency lighting, prolongs the discharge time of LED fluorescent tube.
Description
Technical Field
The utility model belongs to the technical field of emergency lighting, concretely relates to floating ground type LED fluorescent tube emergency lighting's discharge time extension circuit.
Background
LED tubes are commonly used for mains ac power. The LED constant current circuit mainly takes non-isolation and has the topology of voltage reduction, voltage boosting and the like. The control integrated circuit in the three main topologies is of a field control type and a floating control type. According to GB17945-2000 fire-fighting emergency lamps: 5.1.2 the emergency working time of the fire-fighting emergency lamp is not less than 90min and not less than the nominal emergency working time of the lamp; according to the fire safety requirement, the illumination of the standby illumination is not less than 10% of the general illumination value of the place except for other regulations; the illumination value of the safety illumination is not lower than 5% of the illumination value of the general illumination of the place; the illumination value of the evacuation lighting of the evacuation channel is not lower than 0.5 lx. The emergency lighting lamp tubes are generally arranged in proportion in the LED lamp tubes for public lighting occasions according to the fire safety requirements.
In the prior art, an LED lamp tube is often applied to public places such as supermarket lighting, factory lighting, office lighting and the like, and when power failure, fire and the like happen, an alternating current power supply is cut off, and illumination can be continuously provided only by a battery; in order to reduce the cost, the battery capacity of the existing LED lamp tube is fixed, the discharging time is short during emergency lighting, and more lighting time cannot be provided for fire evacuation.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a floating ground type LED fluorescent tube emergency lighting's discharge time extension circuit through voltage discrimination circuit, reduces output current when emergency lighting, prolongs the discharge time of LED fluorescent tube.
The utility model provides a following technical scheme:
the utility model provides a floating type LED fluorescent tube emergency lighting's discharge time extension circuit, includes constant current drive circuit, voltage discrimination circuit, alternating current power supply and LED fluorescent tube, wherein:
the alternating current power supply is used for supplying power to the constant current driving circuit and the LED lamp tube;
the constant current driving circuit is connected with an alternating current power supply and then used for controlling the LED lamp tube to be opened or closed, and the constant current driving circuit adopts a voltage reduction type driving circuit, a voltage boosting type driving circuit and a voltage boosting type driving circuit;
and the voltage judging circuit is connected with the constant current driving circuit and then used for controlling the constant current value, the output power and the discharging time of the LED lamp tube according to the power supply state of the alternating current power supply and the power supply state.
Preferentially, the voltage judging circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a fifth capacitor, a voltage regulator tube and an optical coupler, wherein:
the optical coupler comprises a light emitting diode and a phototriode;
one end of the fifth resistor is connected with one end of a sixth resistor, one end of a fifth capacitor, a voltage dividing end and the cathode of a voltage stabilizing tube, the anode of the voltage stabilizing tube is connected with one end of an eighth resistor, the other end of the eighth resistor is connected with the anode of a light emitting diode, the other end of the fifth capacitor is connected with the other end of the sixth resistor and the cathode of the light emitting diode and then grounded, the collector of the phototriode is connected with one end of a seventh resistor, and the emitter of the phototriode is grounded.
Preferentially, the constant current driving circuit comprises a bridge rectifier circuit, a constant current LED power chip, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, an energy storage inductor and a fifth diode, wherein:
the bridge rectifier circuit comprises a first diode, a second diode, a third diode and a fourth diode, wherein the anode of the first diode is connected with one end of an alternating current power supply and the cathode of the second diode, the cathode of the first diode is connected with the cathode of the third diode, one end of a first capacitor and a plurality of Drain pins of the constant current LED power chip, the anode of the third diode is connected with the other end of the alternating current power supply and the cathode of the fourth diode, and the anode of the fourth diode is connected with the anode of the second diode and the other end of the first capacitor and then grounded;
the constant-current LED power chip is connected with the bridge rectifier circuit and the first capacitor and used for realizing high-precision current output through sampling of peak current of the periodic energy storage inductor and current closed-loop control of a circuit inside the chip.
Preferentially, the CS pin of the constant current LED power chip is connected with the cathode of a fifth diode and one end of a third resistor, the other end of the third resistor is connected with one end of an energy storage inductor, one end of a third capacitor, the GND pin of the constant current LED power chip, one end of a second capacitor and one end of a first resistor and then is grounded, the other end of the second capacitor is connected with the VDD pin of the constant current LED power chip, the other end of the third capacitor is connected with the COMP pin of the constant current LED power chip, the FB pin of the constant current LED power chip is connected with the other end of the first resistor and one end of a second resistor, the other end of the second resistor is connected with one end of a fourth resistor, one end of a fourth capacitor and the other end of the energy storage inductor, and the other end of the fourth capacitor is connected with the other end of the fourth resistor and the anode of the fifth diode.
Preferably, the anode of the LED lamp tube is connected to one end of the fourth capacitor and one end of the fourth resistor, and the cathode of the LED lamp tube is connected to the other end of the fourth capacitor and the other end of the fourth resistor.
Preferably, the other end of the fifth resistor is connected with the cathode of the first diode, the cathode of the third diode, one end of the first capacitor and a plurality of Drain pins of the constant-current LED power chip, and one end of the seventh resistor, which is far away from the optical coupler, is connected with the cathode of the fifth diode, one end of the third resistor, which is far away from the energy storage inductor, and the CS pin of the constant-current LED power chip.
Preferably, the switch tube in the constant current LED power chip works at a high-voltage end.
The utility model has the advantages that: when the alternating current power supply supplies power normally, the optical coupler is conducted, the third resistor and the seventh resistor are connected in parallel, the total resistance value is reduced, and the constant current LED power chip outputs a normal constant current value; during emergency lighting, the voltage is reduced, the voltage of the voltage dividing voltage end is smaller than the voltage stabilizing value of the voltage stabilizing tube, the voltage stabilizing tube and the optical coupler are both cut off, the seventh resistor is separated from the parallel circuit of the third resistor and the seventh resistor, the total resistance value is increased, the output constant current value of the constant current LED power chip is reduced, the output power is reduced, and the purpose of prolonging the emergency lighting time is achieved.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a circuit diagram of the overall connection of the present invention;
fig. 2 is a circuit diagram of the constant current driving circuit of the present invention.
Labeled as: 1. and 2, a voltage judging circuit, 2, a constant current driving circuit and 21, a bridge rectifier circuit.
Detailed Description
As shown in fig. 1, a discharge time extension circuit for emergency lighting of a floating-ground LED lamp comprises a constant current driving circuit 2, a voltage discrimination circuit 1, an AC power supply AC and an LED lamp, wherein:
the alternating current power supply AC is used for supplying power to the constant current driving circuit 2 and the LED lamp tube.
As shown in fig. 2, the constant current driving circuit 2 is connected to an AC power supply AC and then used for controlling the on/off of the LED lamp, the constant current driving circuit 2 employs a voltage-reducing driving circuit, a voltage-boosting driving circuit and a voltage-boosting driving circuit, the constant current driving circuit 2 includes a bridge rectifier circuit 21, a constant current LED power chip U1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, an energy storage inductor and a fifth diode D5, wherein:
as shown in fig. 2, the bridge rectifier circuit 21 includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, an anode of the first diode D1 is connected to one end of the AC power source AC and a cathode of the second diode D2, a cathode of the first diode D1 is connected to a cathode of the third diode D3, one end of the first capacitor C1 and a plurality of Drain pins of the constant current LED power chip U1, an anode of the third diode D3 is connected to the other end of the AC power source AC and a cathode of the fourth diode D4, and an anode of the fourth diode D4 is connected to an anode of the second diode D2 and the other end of the first capacitor C1 and then grounded;
as shown in fig. 2, the constant current LED power chip U1 is connected to the bridge rectifier circuit 21 and the first capacitor C1, and is configured to implement high-precision current output by periodic energy storage inductor peak current sampling and current closed-loop control of a circuit inside the chip, the constant current LED power chip U1 is a highly integrated constant current LED power switch, the constant current LED power chip U1 adopts a quasi-resonant operating mode, and is added with an active power factor correction control technology to implement high-power factor, low harmonic distortion and high-efficiency performance, and a switching tube in the constant current LED power chip U1 operates at a high-voltage end.
As shown in fig. 2, the CS pin of the constant current LED power chip U1 is connected to the cathode of the fifth diode D5 and one end of a third resistor R3, the other end of the third resistor R3 is connected to one end of an energy storage inductor, one end of a third capacitor C3, the GND pin of the constant current LED power chip U1, one end of a second capacitor C2, and one end of a first resistor R1, which are then grounded, the other end of the second capacitor C2 is connected to the VDD pin of the constant current LED power chip U1, the other end of the third capacitor C3 is connected to the COMP pin of the constant current LED power chip U1, the FB of the constant current LED power chip U1 is connected to the other end of the first resistor R1 and one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of a fourth resistor R4, one end of the fourth capacitor C4, and the other end of the energy storage inductor, and the other end of the fourth capacitor C4 is connected to the other end of the fourth resistor R4 and the anode of the fifth diode D5.
As shown in fig. 2, the positive electrode of the LED tube is connected to one end of the fourth capacitor C4 and one end of the fourth resistor R4, and the negative electrode of the LED tube is connected to the other end of the fourth capacitor C4 and the other end of the fourth resistor R4.
As shown in fig. 2, when the constant current LED power chip U1 is powered on, the constant current LED power chip U1 draws current through a high voltage charging circuit inside the Drain pin to charge the second capacitor C2 at the VDD pin. When the capacitance of the VDD pin exceeds the turn-on voltage of the VDD pin, the constant current LED power chip U1 starts to work. Then the COMP pin voltage rises rapidly to 0.7V, and the constant current LED power chip U1 begins to switch at the lowest frequency. Then, along with the slow rise of the voltage of the COMP pin, the output current, the switching frequency and the output voltage also rise, and the constant-current LED power chip U1 realizes soft start and avoids output overshoot during start.
As shown in fig. 2, in the constant current LED power chip U1, as long as the high voltage MOS transistor in the constant current LED power chip U1 is turned off, the 11V regulator will draw a certain current from the Drain pin of the chip to charge the VDD pin capacitor to 11V; when the internal high-voltage MOS tube is conducted, the 11V voltage stabilizer stops working and supplies power to the second capacitor C2 connected by the VDD pin in the constant-current LED power chip U1 so as to normally operate. Since the operating current of the constant current LED power chip U1 is ultra-low, it is sufficient to operate it continuously and stably with the current drawn from the Drain pin of the constant current LED power chip U1.
As shown in fig. 2, after the internal switch of the constant current LED power chip U1 is turned on, the current flowing through the constant current LED power chip U1 sequentially flows through the high-voltage end of the bridge rectifier circuit 21, the multiple Drain pins of the constant current LED power chip U1, the CS pin of the constant current LED power chip U1, the third resistor R3, the energy storage inductor, the positive electrode LED + of the LED lamp tube, the negative electrode LED-of the LED lamp tube, and the ground end of the bridge rectifier circuit 21, thereby forming a conduction loop of the constant current LED power chip U1; when the constant current LED power chip U1 is switched on, energy is stored in the energy storage inductor, and the polarity is positive left and negative right of the energy storage inductor; after the constant current LED power chip U1 is cut off, the discharging working process of the energy storage inductor is as follows: the polarity of the energy storage inductor is reversed, and current flows through the anode LED of the LED lamp tube, the cathode LED of the LED lamp tube, the fifth diode D5, the third resistor R3 and the left side of the energy storage inductor in sequence from the right side of the energy storage inductor to form a loop. The fifth diode D5 provides a path for the energy storage inductor, and the fourth capacitor C4 provides energy storage and filtering for the LED lamp tube; a third capacitor C3 is used for filtering a COMP pin of the constant current LED power chip U1; the fourth resistor R4 is the discharge resistor of the fourth capacitor C4. The first resistor R1 and the second resistor R2 are set resistors of an FB pin of the constant current LED power chip U1; the third resistor R3 is a constant current value setting resistor. The first resistor R1, the third resistor R3, the second capacitor C2 and the third capacitor C3 all use a GND pin of the constant current LED power chip U1 as a reference point.
As shown in fig. 2, the constant current LED power chip U1 employs inductor peak current cycle by cycle. The chip can realize high-precision current output by sampling the peak value current of the inductor in each period and carrying out internal high-precision current closed-loop control. The output current under closed-loop control is determined by the following equation:
wherein, V in the formula (1)CC_REFIs the internal reference voltage of the constant current LED power chip U1; rCSIs a current sampling resistor, i.e., a third resistor R3. As can be seen from equation (1), the resistance of the third resistor R3 determines the LED constant current value. That is, under the condition of the specified input voltage, the constant current value of the LED can be approximated to be independent of the input voltage change, and only related to the resistance value of the third resistor R3. The output power is allowed to decrease to 10% or less of the original value in emergency lighting. The power supply for emergency lighting is usually provided by a battery booster circuit, the output voltage of which is typically around 60V. The effect can be realized by changing the resistance of the third resistor R3 for prolonging the discharge time of the battery.
As shown in fig. 1, the voltage determination circuit 1 is connected to the constant current driving circuit 2 and then used for controlling a constant current value, an output power and a discharging time of the LED lamp according to a power supply state of the AC power supply AC and according to the power supply state, and the voltage determination circuit 1 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a fifth capacitor C5, a voltage regulator ZD1 and an optocoupler U2, where:
as shown in fig. 1, the optocoupler U2 includes a light emitting diode and a phototransistor;
as shown in fig. 1, one end of a fifth resistor R5 is connected to one end of a sixth resistor R6, one end of a fifth capacitor C5, a divided voltage end Vc5, and a cathode of a voltage regulator ZD1, an anode of the voltage regulator ZD1 is connected to one end of an eighth resistor R8, the other end of the eighth resistor R8 is connected to an anode of a light emitting diode, the other end of the fifth capacitor C5 is connected to the other end of the sixth resistor R6 and the cathode of the light emitting diode, and then is grounded, a collector of a phototransistor is connected to one end of a seventh resistor R7, and an emitter of the phototransistor is grounded. The other end of the fifth resistor R5 is connected with the cathode of the first diode D1, the cathode of the third diode D3, one end of the first capacitor C1 and a plurality of Drain pins of the constant current LED power chip U1, and one end of the seventh resistor R7, which is far away from the optical coupler U2, is connected with the cathode of the fifth diode D5, one end of the third resistor R3, which is far away from the energy storage inductor, and the CS pin of the constant current LED power chip U1.
As shown in fig. 1, the phototransistor in the optocoupler U2 acts as a switch in the circuit. When the alternating current power supply AC supplies power, the voltage regulator tube ZD1 is conducted, and the optical coupler U2 is conducted; when the alternating current power supply AC is cut off, the optical coupler U2 is cut off, and the seventh resistor R7 is connected with the collector of the optical coupler U2 in series and then connected with the third resistor R3 in parallel.
As shown in fig. 1, in the normal power supply range of the AC power supply AC, the voltage dividing values of the fifth resistor R5 and the sixth resistor R6 are set to turn on the voltage regulator ZD1, the optocoupler U2 is turned on, the seventh resistor R7 and the third resistor R3 are connected in parallel, and the constant current value output by the constant current LED power chip U1 can be determined by the calculation of the formula (2).
As shown in fig. 1, the total resistance value of the parallel resistors is smaller than the individual resistance values in the branch, as known from ohm's law. Therefore, when the power is supplied by the normal alternating current power supply AC, because the optocoupler U2 is conducted, the third resistor R3 is connected with the seventh resistor R7 in parallel, and the constant current value is set by the parallel resistance value of the third resistor R3 and the seventh resistor R7; the normal constant current value of the constant current driving circuit 2 is satisfied by adjusting the resistance ratio of the third resistor R3 and the seventh resistor R7; when the alternating current power supply AC is powered off, the voltage is boosted by the battery and then supplied, the voltage is only about 60V, the voltage of a voltage division voltage end Vc5 is smaller than the voltage stabilization value of a voltage regulator tube ZD1 after the voltage division is carried out by a fifth resistor R5 and a sixth resistor R6, the voltage regulator tube ZD1 is cut off, the optical coupler U2 is cut off, the seventh resistor R7 is separated from the parallel circuit of the third resistor R3 and the seventh resistor R7, and the constant current value is only set by the third resistor R3. Since the resistance of the third resistor R3 is greater than the parallel resistance of the third resistor R3 and the seventh resistor R7, the constant current value decreases according to the formula (1). When the AC power supply is powered off, the constant current value is reduced, and then the output power of the constant current driving circuit 2 is reduced, thereby realizing the purpose of prolonging the discharge time of the battery. Therefore, the LED working current in emergency lighting can be met by only reasonably selecting the resistance values of the fifth resistor R5 and the sixth resistor R6, the voltage stabilizing value of the voltage stabilizing tube ZD1 and the resistance value of the third resistor R3.
The constant current LED power chip U1 can adjust the constant current value output by the constant current LED power chip U1 to cope with normal power supply and emergency lighting states by connecting a resistor and a control switch in parallel on the sampling resistor.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a discharge time extension circuit of floating type LED fluorescent tube emergency lighting which characterized in that: including constant current drive circuit, voltage discrimination circuit, alternating current power supply and LED fluorescent tube, wherein:
the alternating current power supply is used for supplying power to the constant current driving circuit and the LED lamp tube;
the constant current driving circuit is connected with an alternating current power supply and then used for controlling the LED lamp tube to be opened or closed, and the constant current driving circuit adopts a voltage reduction type driving circuit, a voltage boosting type driving circuit and a voltage boosting type driving circuit;
and the voltage judging circuit is connected with the constant current driving circuit and then used for controlling the constant current value, the output power and the discharging time of the LED lamp tube according to the power supply state of the alternating current power supply and the power supply state.
2. The discharge time extension circuit for emergency lighting of a floating type LED lamp tube according to claim 1, wherein: the voltage judging circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a fifth capacitor, a voltage regulator tube and an optical coupler, wherein:
the optical coupler comprises a light emitting diode and a phototriode;
one end of the fifth resistor is connected with one end of a sixth resistor, one end of a fifth capacitor, a voltage dividing end and the cathode of a voltage stabilizing tube, the anode of the voltage stabilizing tube is connected with one end of an eighth resistor, the other end of the eighth resistor is connected with the anode of a light emitting diode, the other end of the fifth capacitor is connected with the other end of the sixth resistor and the cathode of the light emitting diode and then grounded, the collector of the phototriode is connected with one end of a seventh resistor, and the emitter of the phototriode is grounded.
3. The discharge time extension circuit for emergency lighting of a floating type LED lamp tube according to claim 1, wherein: the constant current driving circuit comprises a bridge rectifier circuit, a constant current LED power chip, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, an energy storage inductor and a fifth diode, wherein:
the bridge rectifier circuit comprises a first diode, a second diode, a third diode and a fourth diode, wherein the anode of the first diode is connected with one end of an alternating current power supply and the cathode of the second diode, the cathode of the first diode is connected with the cathode of the third diode, one end of a first capacitor and a plurality of Drain pins of the constant current LED power chip, the anode of the third diode is connected with the other end of the alternating current power supply and the cathode of the fourth diode, and the anode of the fourth diode is connected with the anode of the second diode and the other end of the first capacitor and then grounded;
the constant-current LED power chip is connected with the bridge rectifier circuit and the first capacitor and used for realizing high-precision current output through sampling of peak current of the periodic energy storage inductor and current closed-loop control of a circuit inside the chip.
4. The discharge time extension circuit for emergency lighting of a floating type LED lamp tube according to claim 3, wherein: the circuit comprises a constant current LED power chip, a first resistor, a second capacitor, a first resistor, a second resistor, a third capacitor, a fourth resistor, a third resistor, an energy storage inductor, a third capacitor, a GND pin of the constant current LED power chip, a second capacitor and a first resistor, wherein a CS pin of the constant current LED power chip is connected with a cathode of the fifth diode and one end of the third resistor, the other end of the third resistor is connected with one end of the energy storage inductor, one end of the third capacitor, a GND pin of the constant current LED power chip, one end of the second capacitor and one end of the first resistor and then is grounded, the other end of the second capacitor is connected with a VDD pin of the constant current LED power chip, the other end of the third capacitor is connected with a COMP pin of the constant current LED power chip, a FB pin of the constant current LED power chip is connected with the other end of the first resistor and one end of the second resistor, the other end of the second resistor is connected with one end, one end of the fourth capacitor and the other end of the energy storage inductor, and the other end of the fourth capacitor is connected with the other end of the anode of the fifth diode.
5. The discharge time extension circuit for emergency lighting of a floating type LED lamp tube according to claim 3, wherein: the anode of the LED lamp tube is connected with one end of the fourth capacitor and one end of the fourth resistor, and the cathode of the LED lamp tube is connected with the other end of the fourth capacitor and the other end of the fourth resistor.
6. The discharge time extension circuit for emergency lighting of a floating type LED lamp tube according to claim 2, wherein: the other end of the fifth resistor is connected with the cathode of the first diode, the cathode of the third diode, one end of the first capacitor and a plurality of Drain pins of the constant-current LED power chip, and one end, far away from the optical coupler, of the seventh resistor is connected with the cathode of the fifth diode, one end, far away from the energy storage inductor, of the third resistor and the CS pin of the constant-current LED power chip.
7. The discharge time extension circuit of the emergency lighting of the floating type LED lamp tube according to claim 4, wherein: and a switching tube in the constant-current LED power chip works at a high-voltage end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120199752.0U CN214413083U (en) | 2021-01-25 | 2021-01-25 | Discharge time prolonging circuit for emergency lighting of floating type LED lamp tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120199752.0U CN214413083U (en) | 2021-01-25 | 2021-01-25 | Discharge time prolonging circuit for emergency lighting of floating type LED lamp tube |
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| Publication Number | Publication Date |
|---|---|
| CN214413083U true CN214413083U (en) | 2021-10-15 |
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|---|---|---|---|
| CN202120199752.0U Expired - Fee Related CN214413083U (en) | 2021-01-25 | 2021-01-25 | Discharge time prolonging circuit for emergency lighting of floating type LED lamp tube |
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| CN (1) | CN214413083U (en) |
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2021
- 2021-01-25 CN CN202120199752.0U patent/CN214413083U/en not_active Expired - Fee Related
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