CN210609810U - LED emergency power supply circuit - Google Patents
LED emergency power supply circuit Download PDFInfo
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- CN210609810U CN210609810U CN201920919576.6U CN201920919576U CN210609810U CN 210609810 U CN210609810 U CN 210609810U CN 201920919576 U CN201920919576 U CN 201920919576U CN 210609810 U CN210609810 U CN 210609810U
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Abstract
The utility model discloses a LED emergency power supply circuit, including EMC circuit, AC/DC converting circuit, DC-DC charging circuit, inverter circuit, dimmer circuit, commercial power detection circuitry, LED drive circuit, rectifier bridge DB1, electric capacity C1, C2, C3, transformer T1, T2, diode D1, D2, D3, battery BAT, relay K1, MCU, MOS pipe Q1, Q2, Q3, inductance L1. The LED emergency power supply circuit of the utility model can be normally used for emergency as long as the LED lamp with the dimming interface has power larger or smaller than the output power of the LED emergency power supply; the wiring is simple, and the wiring can be performed on the site by electricians; the lamp is suitable for the reconstruction of the old lamp, and the installation mode of the original lamp does not need to be modified during the reconstruction.
Description
Technical Field
The utility model relates to a LED power, concretely relates to LED emergency power supply circuit.
Background
At present, the LED emergency power supply in the market is divided into two types, namely a first type: the LED emergency driving device is connected between a driving device and an LED lamp panel, wiring can be completed only in a factory in the LED emergency driving device, and after the LED emergency driving device is damaged, only the whole lamp can be replaced. The wiring is complex, and the replacement cost is high; the second type: connected between an input power supply and a power grid, the output power of the LED emergency power supply is necessarily larger than the input power of a lamp.
Disclosure of Invention
An object of the utility model is to provide a LED emergency power supply circuit, through single chip microcomputer control LED drive power supply's dimming line, when the commercial power, dimming signal directly adjusts luminance to LED drive power supply. When the mains supply is abnormal, the single chip microcomputer sends a dimming signal to drive the LED to work in a deep dimming state, so that the input power of the lamp is smaller than the output power of the LED emergency power supply.
The utility model adopts the technical proposal that: an LED emergency power supply circuit comprises an EMC circuit, an AC/DC conversion circuit, a DC-DC charging circuit, an inverter circuit, a dimmer circuit, a mains supply detection circuit, an LED driving circuit, a rectifier bridge DB1, capacitors C1, C2 and C3, transformers T1 and T2, diodes D1, D2 and D3, a battery BAT, a relay K1, an MCU, MOS (metal oxide semiconductor) tubes Q1, Q2 and Q3 and an inductor L1; the EMC circuit is connected with mains supply; the output end of the EMC circuit is connected with the input end of the rectifier bridge DB 1; the commercial power detection circuit is bridged at two ends of the output end of the EMC circuit; one end of the capacitor C1 is respectively connected with the anode of the output end of the rectifier bridge DB1 and the transformer T1, and the other end is connected with the ground; the MCU is respectively connected with the mains supply detection circuit, the dimmer circuit, the AC/DC conversion circuit, the DC-DC charging circuit, the inverter circuit, the relay K1 and the LED driving circuit; the grid electrode of the MOS transistor Q1 is connected with the AC/DC conversion circuit, the source electrode of the MOS transistor Q1 is connected with the ground, and the drain electrode of the MOS transistor Q1 is connected with the transformer T1; the cathode of the output end of the transformer T1 is connected to the ground, the anode of the output end of the transformer T1 is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the capacitor C2 and the inductor L1 respectively; the other end of the inductor L1 is connected with the anode of the diode D2 and the drain of the MOS transistor Q2 respectively; the source electrode of the MOS transistor Q2 is connected with the ground, and the grid electrode of the MOS transistor Q2 is connected with the DC-DC charging circuit; the cathode of the diode D2 is respectively connected with the anode of the battery BAT and the anode of the input end of the transformer T2, the cathode of the battery BAT is connected with the ground, the cathode of the input end of the transformer T2 is connected with the drain of the MOS tube Q3, the gate of the MOS tube Q3 is connected with the inverter circuit, and the source of the MOS tube Q3 is connected with the relay K1 and is grounded; the anode of the output end of the transformer T2 is connected with the anode of the diode D3, and the capacitor C3 is bridged between the cathode of the diode D3 and the cathode of the output end of the transformer T2; the negative electrode of the diode D3 is connected with the relay K1, the relay K1 is connected with the LED drive circuit, and the LED drive circuit is connected with the LED.
Further, the MOS tubes Q1, Q2 and Q3 are all N-type MOS tubes.
Furthermore, the MOS tubes Q1, Q2 and Q3 are all N-type MOS tubes.
Furthermore, the transformers T1 and T2 are flyback transformers.
Further, the diodes D1, D2, D3 are all ultrafast recovery diodes or schottky diodes.
The utility model has the advantages that:
the LED emergency power supply circuit of the utility model can be normally used for emergency as long as the LED lamp with the dimming interface has power larger or smaller than the output power of the LED emergency power supply;
the wiring is simple, and the wiring can be performed on the site by electricians;
the lamp is suitable for the reconstruction of the old lamp, and the installation mode of the original lamp does not need to be modified during the reconstruction.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.
Fig. 1 is a schematic diagram of an LED emergency power supply circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 1, as shown in fig. 1, an LED emergency power supply circuit includes an EMC circuit, an AC/DC conversion circuit, a DC-DC charging circuit, an inverter circuit, a dimmer circuit, a mains detection circuit, an LED driving circuit, a rectifier bridge DB1, capacitors C1, C2, C3, transformers T1, T2, diodes D1, D2, D3, a battery BAT, a relay K1, an MCU, MOS transistors Q1, Q2, Q3, and an inductor L1; the EMC circuit is connected with mains supply; the output end of the EMC circuit is connected with the input end of the rectifier bridge DB 1; the commercial power detection circuit is bridged at two ends of the output end of the EMC circuit; one end of the capacitor C1 is respectively connected with the anode of the output end of the rectifier bridge DB1 and the transformer T1, and the other end is connected with the ground; the MCU is respectively connected with the mains supply detection circuit, the dimmer circuit, the AC/DC conversion circuit, the DC-DC charging circuit, the inverter circuit, the relay K1 and the LED driving circuit; the grid electrode of the MOS transistor Q1 is connected with the AC/DC conversion circuit, the source electrode of the MOS transistor Q1 is connected with the ground, and the drain electrode of the MOS transistor Q1 is connected with the transformer T1; the cathode of the output end of the transformer T1 is connected to the ground, the anode of the output end of the transformer T1 is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the capacitor C2 and the inductor L1 respectively; the other end of the inductor L1 is connected with the anode of the diode D2 and the drain of the MOS transistor Q2 respectively; the source electrode of the MOS transistor Q2 is connected with the ground, and the grid electrode of the MOS transistor Q2 is connected with the DC-DC charging circuit; the cathode of the diode D2 is respectively connected with the anode of the battery BAT and the anode of the input end of the transformer T2, the cathode of the battery BAT is connected with the ground, the cathode of the input end of the transformer T2 is connected with the drain of the MOS tube Q3, the gate of the MOS tube Q3 is connected with the inverter circuit, and the source of the MOS tube Q3 is connected with the relay K1 and is grounded; the anode of the output end of the transformer T2 is connected with the anode of the diode D3, and the capacitor C3 is bridged between the cathode of the diode D3 and the cathode of the output end of the transformer T2; the negative electrode of the diode D3 is connected with the relay K1, the relay K1 is connected with the LED drive circuit, and the LED drive circuit is connected with the LED.
The MOS tubes Q1, Q2 and Q3 are all N-type MOS tubes.
The MOS tubes Q1, Q2 and Q3 are all N-type MOS tubes.
The transformers T1 and T2 are flyback transformers, preferably EE16 transformers.
The diodes D1, D2 and D3 are all ultrafast recovery diodes or Schottky diodes; preferably, a 1N5819 diode.
Preferably, the MCU is STM8S 003.
The commercial power converts alternating current into stable direct current through an AC/DC conversion circuit.
The DC-DC charging circuit converts the voltage and the current to provide a proper charging curve for the battery.
The inverter circuit converts the energy stored in the battery into proper voltage for driving the LED when the commercial power is cut off,
the MCU control circuit detects and controls commercial power, battery voltage, output power, dimming signals and the like.
The AC/DC conversion circuit is a flyback switching power supply and outputs constant voltage or constant current.
The commercial power detection circuit converts the normal or abnormal state of the city into a signal which can be received by the MCU, and provides reference for the MCU to control the working state
The DC-DC battery charging circuit is a constant voltage and constant current circuit which can meet the charging characteristics of the battery.
The inverter circuit inverts the battery low-voltage direct current into high-voltage alternating current (direct current) so as to be suitable for the LED driving power supply to work.
The MCU control circuit comprises MCU signal processing and dimming signal processing.
The battery comprises a battery and a protection plate.
The utility model discloses a working process:
working state 1:
when the mains supply is connected, the AC-DC conversion circuit converts alternating current into proper direct current for the charging circuit to use, and meanwhile, the mains supply detection circuit provides signals to the single chip microcomputer, and the mains supply is normal. The charging circuit converts the voltage and the current, is controlled by the single chip microcomputer and outputs a voltage and current curve matched with the battery. At the moment, the commercial power directly supplies power to the LED drive through the normally closed contact of the relay K1, and the LED works in a rated working state.
As shown in fig. 1, the AC-DC conversion circuit is a switching power supply control chip (such as IW3627, OB3636, etc.), Q1 is a switching MOS transistor, the AC-DC conversion circuit controls MOS Q1 to operate at a proper duty ratio, and the voltage is isolated and reduced by transformer T1, rectified by D1, and filtered by C2, so as to form a stable direct current.
The charging current control circuit shown in fig. 1 is a boost switching power supply control chip (such as RT 8474), Q2 is a boost switching MOS transistor, the charging current control circuit controls MOS Q2 to work at a proper duty ratio, L1 is a boost energy storage inductor, D2 is a freewheeling diode to provide proper charging current and voltage for the battery, and the charging current control circuit can receive single-chip control and change the charging current and voltage according to the battery requirement.
As shown in fig. 1, D3 is an isolation diode to prevent the battery from discharging the charging circuit in the reverse direction when the utility power is abnormal, the charging circuit is abnormal or is dormant.
And 2, working state:
when the commercial power is abnormal, the commercial power detection circuit provides a commercial power abnormal signal to the single chip microcomputer, the single chip microcomputer controls the inversion control circuit to start working, the battery voltage is inverted into 120V alternating current equivalent direct current voltage, the relay K1 is switched to a normally open contact, the inverted direct current is sent to the LED for driving, meanwhile, the single chip microcomputer controls the LED to drive the dimming line, starting from the lowest brightness, the dimming line is slowly adjusted upwards, and the LED driving working power is enabled to be just equal to the output rated power of the emergency power supply.
As shown in fig. 1, when the utility power is abnormal, the pin of the MCU relay K1 outputs a high level, the relay K1 is pulled in, the relay K1 is switched from the normally closed contact to the normally open contact, and the LED driving input voltage is switched from the utility power to the emergency power source for inversion.
As shown in fig. 1, when the utility power is abnormal, the pin of the MCU relay K2 outputs high level, the relay K2 is closed, the relay K2 is switched from the normally closed contact to the normally open contact, and the LED driving dimming signal is switched from the dimmer control to the MCU output control.
And 3, working state:
when the test switch SW1 is pressed for a long time in the emergency state, the system enters the sleep state, the standby current is less than 100uA, and the sleep control circuit is shown in FIG. 1
When the single chip microcomputer receives the sleep signal of the test switch, the control signals of the Q4 and the Q6 are changed into low level, the Q4 and the Q6 are closed, at the moment, the Q3 is in a closed state, the battery does not provide energy for the single chip microcomputer any more, and the single chip microcomputer is powered off. Because of the reverse blocking diodes D4, D5 and MOS Q3, the battery no longer has any losses. When the commercial power is recovered, the commercial power supplies energy to the single chip microcomputer through the D4 diode, and the system is reactivated to start working.
The purpose of the utility model is to provide a hardware configuration that is different from prior art's LED emergency power supply circuit, make the technical staff realize further development under such configuration.
The LED emergency power supply circuit of the utility model can be normally used for emergency as long as the LED lamp with the dimming interface has power larger or smaller than the output power of the LED emergency power supply;
the wiring is simple, and the wiring can be performed on the site by electricians;
the lamp is suitable for the reconstruction of the old lamp, and the installation mode of the original lamp does not need to be modified during the reconstruction.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (4)
1. An LED emergency power supply circuit is characterized by comprising an EMC circuit, an AC/DC conversion circuit, a DC-DC charging circuit, an inverter circuit, a dimmer circuit, a mains supply detection circuit, an LED driving circuit, a rectifier bridge DB1, capacitors C1, C2 and C3, transformers T1 and T2, diodes D1, D2 and D3, a battery BAT, a relay K1, an MCU, MOS (metal oxide semiconductor) tubes Q1, Q2 and Q3 and an inductor L1; the EMC circuit is connected with mains supply; the output end of the EMC circuit is connected with the input end of the rectifier bridge DB 1; the commercial power detection circuit is bridged at two ends of the output end of the EMC circuit; one end of the capacitor C1 is respectively connected with the anode of the output end of the rectifier bridge DB1 and the transformer T1, and the other end is connected with the ground; the MCU is respectively connected with the mains supply detection circuit, the dimmer circuit, the AC/DC conversion circuit, the DC-DC charging circuit, the inverter circuit, the relay K1 and the LED driving circuit; the grid electrode of the MOS transistor Q1 is connected with the AC/DC conversion circuit, the source electrode of the MOS transistor Q1 is connected with the ground, and the drain electrode of the MOS transistor Q1 is connected with the transformer T1; the cathode of the output end of the transformer T1 is connected to the ground, the anode of the output end of the transformer T1 is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the capacitor C2 and the inductor L1 respectively; the other end of the inductor L1 is connected with the anode of the diode D2 and the drain of the MOS transistor Q2 respectively; the source electrode of the MOS transistor Q2 is connected with the ground, and the grid electrode of the MOS transistor Q2 is connected with the DC-DC charging circuit; the cathode of the diode D2 is respectively connected with the anode of the battery BAT and the anode of the input end of the transformer T2, the cathode of the battery BAT is connected with the ground, the cathode of the input end of the transformer T2 is connected with the drain of the MOS tube Q3, the gate of the MOS tube Q3 is connected with the inverter circuit, and the source of the MOS tube Q3 is connected with the relay K1 and is grounded; the anode of the output end of the transformer T2 is connected with the anode of the diode D3, and the capacitor C3 is bridged between the cathode of the diode D3 and the cathode of the output end of the transformer T2; the negative electrode of the diode D3 is connected with the relay K1, the relay K1 is connected with the LED drive circuit, and the LED drive circuit is connected with the LED.
2. The LED emergency power supply circuit of claim 1, wherein the MOS transistors Q1, Q2 and Q3 are all N-type MOS transistors.
3. The LED emergency power supply circuit of claim 1, wherein the transformers T1, T2 are flyback transformers.
4. The LED emergency power supply circuit of claim 1, wherein the diodes D1, D2, D3 are all ultrafast recovery diodes or Schottky diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920919576.6U CN210609810U (en) | 2019-06-19 | 2019-06-19 | LED emergency power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920919576.6U CN210609810U (en) | 2019-06-19 | 2019-06-19 | LED emergency power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN210609810U true CN210609810U (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920919576.6U Active CN210609810U (en) | 2019-06-19 | 2019-06-19 | LED emergency power supply circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116760166A (en) * | 2023-06-05 | 2023-09-15 | 广东振辉消防科技有限公司 | Special emergency power supply for integrated buck-boost lamp |
| CN117524795A (en) * | 2024-01-05 | 2024-02-06 | 深圳市华浩德电子有限公司 | Control circuit without current and spark during contact action of non-afterglow BUCK output relay |
-
2019
- 2019-06-19 CN CN201920919576.6U patent/CN210609810U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116760166A (en) * | 2023-06-05 | 2023-09-15 | 广东振辉消防科技有限公司 | Special emergency power supply for integrated buck-boost lamp |
| CN116760166B (en) * | 2023-06-05 | 2024-01-19 | 广东振辉消防科技有限公司 | Special emergency power supply for integrated buck-boost lamp |
| CN117524795A (en) * | 2024-01-05 | 2024-02-06 | 深圳市华浩德电子有限公司 | Control circuit without current and spark during contact action of non-afterglow BUCK output relay |
| CN117524795B (en) * | 2024-01-05 | 2024-04-16 | 深圳市华浩德电子有限公司 | Control circuit without current and spark during contact action of non-afterglow BUCK output relay |
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