CN218603690U - Discharge circuit and power supply circuit of LED lamp - Google Patents
Discharge circuit and power supply circuit of LED lamp Download PDFInfo
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- CN218603690U CN218603690U CN202222512995.2U CN202222512995U CN218603690U CN 218603690 U CN218603690 U CN 218603690U CN 202222512995 U CN202222512995 U CN 202222512995U CN 218603690 U CN218603690 U CN 218603690U
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Abstract
The utility model provides a power supply circuit of discharge circuit and LED lamp relates to LED lighting drive circuit technical field, including first branch road, it includes first resistance module and MOS pipe switch, the second branch road, and it includes second resistance module and TVS diode, opto-coupler switch module, including connecting opto-coupler switch on the TVS diode, wherein work as when opto-coupler switch switches on, MOS pipe switch's grid is inserted the low potential and is ended, this moment output capacitance supplies power for the load, works as during the opto-coupler switch disconnection, the TVS diode warp the second resistance module MOS pipe's grid inserts the high potential, output capacitance warp first branch road discharges, has realized electric capacity and has discharged fast for the relay soft start neither can appear the lamp and dodge, can not lead to the relay contact to draw the arc, burn out yet, has increased the reliability of product, and through increasing electric capacity fast discharge circuit, has shortened production cycle, promotes production efficiency.
Description
Technical Field
The utility model relates to a LED lighting drive circuit technical field especially relates to a quick discharge circuit of output electric capacity and LED lamps and lanterns.
Background
With the increasing emphasis on energy conservation and emission reduction in various countries around the world, the LED is used as a new light source to be more and more widely applied in terms of high efficiency and energy conservation. The LED has the advantages that the LED is divided into a non-isolated design and an isolated driving power supply, the non-isolated power supply is usually smaller than the isolated power supply with the same power level, the efficiency is higher, the cost is lower, the application requirements of the constant voltage power supply in the LED plant light supplement market are popularized and are in an increasing trend at present, particularly, different spectrums are needed by plants in different growth periods, and therefore the high-power non-isolated LED constant current source is developed and designed.
When the non-isolated LED is switched off in dimming, the LED lamp beads have a slight brightness problem due to the leakage current of the power loop, the LED lamp beads are disconnected from the power loop when the non-isolated LED power supply is switched off in dimming, but the non-isolated LED power supply has large output capacitance capacity and slow discharge time, the output end is provided with a load machine or the LED lamp beads, the voltage is released quickly, when the LED power supply is switched on and switched off quickly, the two ends of the relay still have large pressure difference, the contact of the relay is caused to be arc-drawn, and finally the relay is adhered together to cause the failure of the relay, so that the lamp beads are slightly bright due to the fact that the power loop and the LED lamp beads are not thoroughly disconnected when the LED power supply is switched off in dimming, and the use of customers is influenced.
In conclusion, it can be seen that how to rapidly discharge the output capacitor so as to soft start the relay does not cause flash of light, and does not cause arcing and burnout of the relay contacts is a problem to be solved at present.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model aims to solve the technical problem of overcoming the easy contact arc discharge and burnout of the output circuit in the prior art.
In order to solve the above technical problem, the utility model provides a discharge circuit, include:
the first branch circuit comprises a first resistance module and an MOS tube switch;
one end of the first resistance module is connected with the anode of the output capacitor;
the MOS tube switch is connected between the other end of the first resistor module and the cathode of the output capacitor in series;
a second branch including a second resistance module and a TVS diode;
the second resistance module has a resistance value larger than that of the first resistance module, and one end of the second resistance module is connected with the anode of the output capacitor;
the negative electrode of the TVS diode is connected to the grid of the MOS transistor switch and the other end of the second resistor module at the same time, and the positive electrode of the TVS diode is connected to the negative electrode of the output capacitor and grounded;
the optical coupling switch module comprises an optical coupling switch connected on the TVS diode, wherein
When the optical coupling switch is switched on, the grid electrode of the MOS tube switch is switched on to a low potential and is cut off, and the output capacitor supplies power to a load;
when the optical coupling switch is switched off, the TVS diode is connected with a high potential through the grid electrode of the MOS tube by the second resistance module, and the output capacitor is discharged through the first branch circuit.
The utility model discloses an in an embodiment, the opto-coupler switch module still includes VCC control port, with opto-coupler switch connects for control opto-coupler switch switches on and shuts off.
In an embodiment of the present invention, the VCC control port is further connected in series to a third resistor, and the third resistor is used for optical coupling current limiting.
In an embodiment of the present invention, the output capacitor is formed by connecting two capacitors in parallel.
In an embodiment of the present invention, the first resistor module is composed of four resistors connected in series, and the four resistors are all 1210 models.
In an embodiment of the present invention, the second resistor module is composed of three resistors connected in series, and the three resistors are all of type 1206.
In one embodiment of the present invention, the MOS transistor switch is of the TO-252 type.
In an embodiment of the present invention, the TVS diode is of SOD-123 type.
In an embodiment of the present invention, the optocoupler switch is of EL1018 type.
The utility model discloses an embodiment is a power supply circuit of LED lamp, including output electric capacity, relay module, relay control circuit, load circuit and the aforesaid discharge circuit, wherein discharge circuit connects on the output of output electric capacity, the relay module connects discharge circuit with between the load circuit, relay control circuit connects on the relay module.
Compared with the prior art, the technical scheme of the utility model have following advantage:
the utility model provides a discharge circuit, through control opto-coupler non-conduction with the MOS pipe, TVS pipe and resistance constitute the discharge circuit, discharge electric capacity, accomplish zero voltage and open, electric capacity discharges fast, make relay soft start, neither lamp dodge can appear, also can not lead to the relay contact to draw the arc, burn out, the reliability of product has been increased, and through increasing electric capacity quick discharge circuit, make the direct load machine that uses of power ageing, it is ageing without the LED lamps and lanterns, the production cycle is shortened, and the production efficiency is promoted.
Drawings
In order to make the content of the present invention more clearly understood, the present invention will be described in further detail below according to specific embodiments of the present invention in conjunction with the attached drawings, in which:
FIG. 1 is a circuit diagram of an LED power supply;
fig. 2 is a circuit diagram of a discharge circuit.
Detailed Description
The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
Referring to fig. 1, the utility model provides a LED power supply circuit, include:
and the output capacitor 110 is used for providing energy for the LED lamp, and the output capacitor is formed by connecting two capacitors EC1 and EC2 in parallel.
A discharge circuit 120 connected to the output capacitor for rapidly discharging the output capacitor, as shown in fig. 2, the discharge circuit includes:
a first branch 121 including a first resistor module and a MOS transistor switch;
the first resistance module is formed by connecting resistors R1, R2, R3 and R4 in series, and one end of the first resistance module is connected with the anode of the output capacitor;
the MOS tube switch is connected between the other end of the first resistor module and the cathode of the output capacitor in series;
a second branch 122 including a second resistance module and a TVS diode;
the second resistance module is formed by connecting resistors R5, R6 and R7 in series, has a resistance value larger than that of the first resistance module, and one end of the second resistance module is connected with the anode of the output capacitor;
the negative electrode of the TVS diode is connected with the grid electrode of the MOS tube switch and the other end of the second resistor module at the same time, and the positive electrode of the TVS diode is connected with the negative electrode of the output capacitor and grounded;
an optocoupler switch module 123 comprising an optocoupler switch connected to the TVS diode, wherein
When the optical coupling switch is switched on, the grid electrode of the MOS tube switch is switched on to a low potential and is cut off, and the output capacitor supplies power to a load;
when the optical coupling switch is switched off, the TVS diode switches the grid of the MOS tube into a high potential through the second resistance module, and the output capacitor discharges through the first branch circuit;
the VCC control port is connected with the optical coupling switch and is used for controlling the on-off of the optical coupling switch;
the VCC control port is also connected in series with a third resistor R8, which is used for optical coupling current limiting.
EMI filter module 130: and the filter is used for outputting and filtering, so that the safety certification requirements of products are met.
The control output module 140: used for controlling the on-off of the output end.
The filtering module 150: the filter is used for filtering output current and voltage, reducing output ripple voltage and outputting ripple current.
The working principle of the output capacitor quick discharge circuit is as follows:
when the relay is powered on, the single chip microcomputer sends an instruction to control the relay signal K-OFF to be set high, the relay is firstly attracted, the differential pressure at two ends of the relay is zero at the moment, and the relay realizes soft start pressure opening; then the VCC-P voltage signal ON _ OFF is controlled to be lowered, the VCC-P voltage is raised to the set voltage, the circuit works, the output capacitor stores energy, the light emitting diode in the optocoupler U1 is conducted, the MOS tube Q1G pole is pulled down and cannot be switched ON, the first resistor module and the MOS tube do not discharge the output capacitor, and the output capacitor provides energy for the LED lamp bead or the load;
when the power supply is powered off, because the load machine or the LED lamp beads are connected, the voltage of the output end is rapidly reduced, the VCC-P voltage is rapidly reduced to zero, the light emitting diode in the optocoupler U1 cannot be conducted, the G electrode potential of the MOS tube switch is clamped at a conducting voltage value by the TVS diode D1 through the second resistor module, and the first resistor module and the MOS tube switch rapidly discharge the output capacitor, so that the voltage difference between two ends of the relay is very small, and before next power-on, the voltage difference between two ends of the relay is small, the relay hardly arcs, thereby protecting the contact of the relay and realizing the soft start of the relay;
under the dimming state, when the single chip receives a lamp turn-OFF instruction, the single chip sends a control VCC-P voltage signal ON _ OFF to be set high, VCC-P drops to zero voltage rapidly, a light emitting diode in the optocoupler U1 cannot be conducted, the potential of the G electrode of the MOS tube switch is clamped at a conduction voltage value by the TVS diode D1 through the second resistor module, the first resistor module and the MOS tube discharge an output capacitor loop rapidly, and sends a control relay signal K-OFF to be set low again, so that the relay K1 is disconnected, the pressure difference between two ends is small when the relay is turned OFF, and a relay contact is protected.
This embodiment provides a discharge circuit, utilize MOS pipe control capacitance to discharge, restrict TVS diode current through the second resistance module, and provide the turn-on voltage for the MOS pipe, utilize TVS pipe clamp MOS pipe switch G utmost point voltage, reach the opening voltage threshold value, and protect MOS pipe switch G utmost point not damaged, control the opto-coupler through VCC control port and switch on and shut off, thereby control the MOS pipe switch and switch on and shut off, the electric capacity discharges fast, make the relay soft start, neither can appear the lamp flash, can not lead to the relay contact to draw the arc again, burn out, increase product reliability, simultaneously through increasing the quick discharge circuit of electric capacity, can be so that the direct load machine that uses of power is ageing, LED lamps and lanterns are ageing, shorten production cycle, reduce manpower transport lamps and lanterns, promote production efficiency.
It should be noted that, the four resistors of the first resistor module are not limited to 1210 models, and may be existing products meeting the requirements, which is not limited in this embodiment of the present invention.
It should be noted that, the three resistors of the second resistor module are not limited to the model 1206, and may be the existing product meeting the requirements, which is not limited in this embodiment of the present invention.
It should be noted that the MOS transistor switch is not limited TO the TO-252 model, and may be an existing product that meets the requirements, which is not limited in this embodiment of the present invention.
It should be noted that the TVS diode is not limited to the SOD-123 model, and may be an existing product meeting the requirements, and is not limited in this embodiment of the present invention.
It should be noted that the optical coupling switch is not limited to the EL1018 type, and may be an existing product meeting the requirements, which is not limited in this embodiment of the present invention.
This embodiment still provides a power supply circuit of LED lamp, including output capacitor, relay module, relay control circuit, load circuit and the aforesaid discharge circuit, wherein discharge circuit connects on output capacitor's output, the relay module connect discharge circuit with between the load circuit, relay control circuit connects on the relay module.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.
Claims (10)
1. A discharge circuit for discharging an output capacitor, comprising:
the first branch circuit comprises a first resistance module and an MOS tube switch;
one end of the first resistance module is connected with the anode of the output capacitor;
the MOS tube switch is connected between the other end of the first resistor module and the cathode of the output capacitor in series;
a second branch including a second resistance module and a TVS diode;
the second resistance module has a resistance value larger than that of the first resistance module, and one end of the second resistance module is connected with the anode of the output capacitor;
the negative electrode of the TVS diode is connected to the grid of the MOS transistor switch and the other end of the second resistor module at the same time, and the positive electrode of the TVS diode is connected to the negative electrode of the output capacitor and grounded;
the optical coupling switch module comprises an optical coupling switch connected on the TVS diode, wherein
When the optical coupling switch is switched on, the grid electrode of the MOS tube switch is switched on to a low potential and is cut off, and the output capacitor supplies power to a load;
when the optical coupling switch is switched off, the TVS diode passes through the second resistance module, the grid of the MOS tube is connected with a high potential, and the output capacitor discharges through the first branch circuit.
2. The discharge circuit of claim 1, wherein the optocoupler switch module further comprises a VCC control port, coupled to the optocoupler switch, for controlling the optocoupler switch to turn on and off.
3. The discharge circuit of claim 2, wherein said VCC control port is further connected in series with a third resistor, said third resistor for optically coupled current limiting.
4. The discharge circuit of claim 1, wherein said output capacitance is comprised of two capacitors in parallel.
5. The discharge circuit of claim 1, wherein said first resistor module is comprised of four resistors connected in series, each of said four resistors being model 1210.
6. The discharge circuit of claim 1, wherein said second resistor module is comprised of three resistors connected in series, each of said three resistors being of type 1206.
7. The discharge circuit of claim 1, wherein said MOS transistor is of the TO-252 type.
8. The discharge circuit of claim 1, wherein said TVS diode is of the SOD-123 type.
9. The discharge circuit of claim 1, wherein the optocoupler switch is of the EL1018 variety.
10. A power supply circuit for LED lamps, comprising an output capacitor, a relay module, a relay control circuit, a load circuit, and the discharge circuit of any one of claims 1 to 9, wherein the discharge circuit is connected to the output terminal of the output capacitor, the relay module is connected between the discharge circuit and the load circuit, and the relay control circuit is connected to the relay module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222512995.2U CN218603690U (en) | 2022-09-22 | 2022-09-22 | Discharge circuit and power supply circuit of LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222512995.2U CN218603690U (en) | 2022-09-22 | 2022-09-22 | Discharge circuit and power supply circuit of LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218603690U true CN218603690U (en) | 2023-03-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222512995.2U Active CN218603690U (en) | 2022-09-22 | 2022-09-22 | Discharge circuit and power supply circuit of LED lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218603690U (en) |
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2022
- 2022-09-22 CN CN202222512995.2U patent/CN218603690U/en active Active
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