CN209787516U - active dummy load circuit - Google Patents
active dummy load circuit Download PDFInfo
- Publication number
- CN209787516U CN209787516U CN201822162926.7U CN201822162926U CN209787516U CN 209787516 U CN209787516 U CN 209787516U CN 201822162926 U CN201822162926 U CN 201822162926U CN 209787516 U CN209787516 U CN 209787516U
- Authority
- CN
- China
- Prior art keywords
- resistor
- led
- cathode
- anode
- dummy load
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The utility model provides an active dummy load circuit, include: the LED driving circuit comprises an electrolytic capacitor C2 arranged between the anode and the cathode of the LED, a resistor R3 connected with the electrolytic capacitor C2 in parallel, and a switch Q1 controlling the connection of the anode and the cathode of the LED; when the LED is lighted, the switch is switched off, and the resistor R3 does not act; when the LED is extinguished, the switch is closed, the resistor R3 is connected between the anode and the cathode of the LED, and the electrolytic capacitor C2 discharges through the resistor R3. The active dummy load circuit can discharge the electrolytic capacitor quickly.
Description
Technical Field
The utility model relates to a LED drive circuit especially relates to an active dummy load circuit.
Background
The output end of the high-power lamp is generally connected with a large-capacity electrolytic capacitor in parallel, and the large-capacity electrolytic capacitor discharges slowly after the power supply is cut off, so that certain potential safety hazards are caused to a human body. The best method is to discharge the electricity on the electrolytic capacitor in a short time, so that a resistor with certain resistance is required to be connected in parallel at two ends of the electrolytic capacitor. If the resistance value of the resistor is larger, the electrolytic capacitor discharges too slowly, and the effect is not ideal; if the resistance value of the resistor is small, the loss on the resistor is large, and the efficiency of the whole power supply is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the main technical problem that an active dummy load circuit is provided, can discharge electrolytic capacitor fast.
In order to solve the technical problem, the utility model provides an active dummy load circuit, include: the LED driving circuit comprises an electrolytic capacitor C2 arranged between the anode and the cathode of the LED, a resistor R3 connected with the electrolytic capacitor C2 in parallel, and a switch Q1 controlling the connection of the anode and the cathode of the LED; when the LED is lighted, the switch is switched off, and the resistor R3 does not act; when the LED is extinguished, the switch is closed, the resistor R3 is connected between the anode and the cathode of the LED, and the electrolytic capacitor C2 discharges through the resistor R3.
In a preferred embodiment: the switch is a PNP triode Q1, and the base electrode of the switch is connected with the main circuit through a voltage reduction network; the emitter of the LED is connected to the anode of the LED through the resistor R3, and the collector of the LED is connected to the cathode of the LED.
In a preferred embodiment: the buck network comprises resistors R1 and R2; one end of the resistor R2 is connected to the base electrode of the PNP triode Q1, and the other end of the resistor R2 is connected with one end of the resistor R1 and the main circuit; the other end of the resistor R1 is connected to the cathode of the LED.
In a preferred embodiment: and a capacitor C1 is connected in parallel with two ends of the resistor R1.
In a preferred embodiment: an isolation diode D2 is connected between the resistor R2 and the main circuit; the cathode of the isolation diode D2 is connected with the resistor R2, and the anode is connected with the main circuit.
Compared with the prior art, the technical scheme of the utility model possess following beneficial effect:
The utility model provides an active dummy load circuit, when the LED lamp is bright, the main circuit charges to electric capacity C1 through isolation diode D2, can know by resistance R2+ resistance R3 and resistance R1 partial pressure, and PNP triode Q1's base is high voltage, and PNP triode Q1 does not switch on, and resistance R3 does not have the electric current to pass through. When the LED lamp is turned off, the capacitor C1 is no longer charged, the base voltage of the PNP transistor Q1 is low, the PNP transistor Q1 is turned on, and the electrolytic capacitor C2 discharges through R3 → Q1, so that the voltage across the electrolytic capacitor C2 drops to 0 rapidly.
Drawings
Fig. 1 is a circuit diagram of the preferred embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and the detailed description.
Referring to fig. 1, an active dummy load circuit includes: the LED driving circuit comprises an electrolytic capacitor C2 arranged between the anode and the cathode of the LED, a resistor R3 connected with the electrolytic capacitor C2 in parallel, and a switch Q1 controlling the connection of the anode and the cathode of the LED; when the LED is lighted, the switch is switched off, and the resistor R3 does not act; when the LED is extinguished, the switch is closed, the resistor R3 is connected between the anode and the cathode of the LED, and the electrolytic capacitor C2 discharges through the resistor R3.
Specifically, the switch is a PNP triode Q1, and the base electrode of the PNP triode Q1 is connected with the main circuit through a voltage reduction network; the emitter of the LED is connected to the anode of the LED through the resistor R3, and the collector of the LED is connected to the cathode of the LED. The buck network comprises resistors R1 and R2; one end of the resistor R2 is connected to the base electrode of the PNP triode Q1, and the other end of the resistor R2 is connected with one end of the resistor R1 and the main circuit; the other end of the resistor R1 is connected to the cathode of the LED. And a capacitor C1 is connected in parallel with two ends of the resistor R1.
In order to isolate the active dummy load circuit from the main circuit, an isolation diode D2 is connected between the resistor R2 and the main circuit; the cathode of the isolation diode D2 is connected with the resistor R2, and the anode is connected with the main circuit.
In the active dummy load circuit, when the LED lamp is turned on, the main circuit charges the capacitor C1 through the isolation diode D2, the voltage is divided by the resistor R2+ the resistor R3 and the resistor R1, the base of the PNP triode Q1 is high voltage, the PNP triode Q1 is not turned on, and no current flows through the resistor R3. When the LED lamp is turned off, the capacitor C1 is no longer charged, the base voltage of the PNP transistor Q1 is low, the PNP transistor Q1 is turned on, and the electrolytic capacitor C2 discharges through R3 → Q1, so that the voltage across the electrolytic capacitor C2 drops to 0 rapidly.
The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and variations or technical scope of the present invention disclosed may be easily conceived by those skilled in the art. Alternatives are intended to be within the scope of the invention. Therefore, the protection scope of the present invention should be determined by the scope of the claims.
Claims (5)
1. An active dummy load circuit, comprising: the LED driving circuit comprises an electrolytic capacitor C2 arranged between the anode and the cathode of the LED, a resistor R3 connected with the electrolytic capacitor C2 in parallel, and a switch Q1 controlling the connection of the anode and the cathode of the LED; when the LED is lighted, the switch is switched off, and the resistor R3 does not act; when the LED is extinguished, the switch is closed, the resistor R3 is connected between the anode and the cathode of the LED, and the electrolytic capacitor C2 discharges through the resistor R3.
2. An active dummy load circuit according to claim 1, wherein: the switch is a PNP triode Q1, and the base electrode of the switch is connected with the main circuit through a voltage reduction network; the emitter of the LED is connected to the anode of the LED through the resistor R3, and the collector of the LED is connected to the cathode of the LED.
3. An active dummy load circuit according to claim 2, wherein: the buck network comprises resistors R1 and R2; one end of the resistor R2 is connected to the base electrode of the PNP triode Q1, and the other end of the resistor R2 is connected with one end of the resistor R1 and the main circuit; the other end of the resistor R1 is connected to the cathode of the LED.
4. An active dummy load circuit according to claim 2, wherein: and a capacitor C1 is connected in parallel with two ends of the resistor R1.
5. An active dummy load circuit according to claim 3, wherein: an isolation diode D2 is connected between the resistor R2 and the main circuit; the cathode of the isolation diode D2 is connected with the resistor R2, and the anode is connected with the main circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822162926.7U CN209787516U (en) | 2018-12-21 | 2018-12-21 | active dummy load circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822162926.7U CN209787516U (en) | 2018-12-21 | 2018-12-21 | active dummy load circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209787516U true CN209787516U (en) | 2019-12-13 |
Family
ID=68790397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822162926.7U Active CN209787516U (en) | 2018-12-21 | 2018-12-21 | active dummy load circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209787516U (en) |
-
2018
- 2018-12-21 CN CN201822162926.7U patent/CN209787516U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102904329B (en) | Electric power management circuit | |
| CN209787516U (en) | active dummy load circuit | |
| CN202550491U (en) | Battery over-discharge projection circuit | |
| CN101431249B (en) | Energy-saving apparatus for charger of boosted vehicle | |
| CN206564464U (en) | A kind of current foldback circuit without sample resistance | |
| CN102683112A (en) | Energy-saving controller for coil of relay | |
| CN104659847A (en) | Battery charging control circuit and lamp | |
| CN204031561U (en) | The anti-rush of current circuit of LED lamp | |
| CN210490527U (en) | Dummy load energy-saving charger circuit | |
| CN202564138U (en) | Energy-saving controller of relay coil | |
| CN203398843U (en) | M-BUS bus equipment based auxiliary power supply | |
| CN219247705U (en) | Charge discharging circuit, system, motor driver and vehicle | |
| CN210724716U (en) | Reset overload protection circuit of high-voltage pulse generator | |
| CN105305397A (en) | Overvoltage protection circuit and electronic equipment | |
| CN219960206U (en) | Emergency switching circuit for power supply | |
| CN213937862U (en) | IGBT circuit for realizing pre-charging | |
| CN210167840U (en) | High internal resistance power supply with pulse load circuit | |
| CN212085883U (en) | Automatic power supply switching circuit | |
| CN218526113U (en) | Emergency power supply output control circuit and charging device | |
| CN209882184U (en) | High-voltage circuit for mosquito eradication lamp | |
| CN216647204U (en) | Low-power consumption control circuit | |
| CN211923841U (en) | Electric lock control circuit | |
| CN203072204U (en) | Environment-friendly LED lighting delay circuit | |
| CN212872636U (en) | Battery low pressure warning indicating circuit | |
| CN208386164U (en) | A kind of isolation circuit of ultra low dropout |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |