CN220711686U - LED drive circuit capable of accelerating starting speed - Google Patents
LED drive circuit capable of accelerating starting speed Download PDFInfo
- Publication number
- CN220711686U CN220711686U CN202322187473.4U CN202322187473U CN220711686U CN 220711686 U CN220711686 U CN 220711686U CN 202322187473 U CN202322187473 U CN 202322187473U CN 220711686 U CN220711686 U CN 220711686U
- Authority
- CN
- China
- Prior art keywords
- resistor
- electrically connected
- electrolytic capacitor
- field effect
- module
- 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
- 239000003990 capacitor Substances 0.000 claims abstract description 162
- 230000005669 field effect Effects 0.000 claims abstract description 124
- 230000000087 stabilizing effect Effects 0.000 claims description 23
- 230000002093 peripheral effect Effects 0.000 claims description 19
- 238000005070 sampling Methods 0.000 claims description 16
- 238000005286 illumination Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Landscapes
- Led Devices (AREA)
Abstract
The utility model relates to the technical field of LED driving circuits, in particular to an LED driving circuit capable of accelerating the starting speed, which comprises an LED linear driving module, a power switching module, a quick starting module and an electrolytic capacitor E1, wherein the quick starting module comprises a field effect transistor Q2 and the electrolytic capacitor E2, so that when an external electric signal output module does not output an electric signal, the power switching module does not work, the field effect transistor Q2 is also not conducted, the current of the whole loop is smaller, but when the field effect transistor Q2 is not conducted, the electrolytic capacitor E2 works, the output is formed by connecting the electrolytic capacitor E1 and the electrolytic capacitor E2 in series, the capacitance value of the electrolytic capacitor E1 and the electrolytic capacitor E2 after the output is connected in series is reduced, and the current required for charging the electrolytic capacitor E1 and the electrolytic capacitor E2 is reduced, thereby accelerating the charging speed of the electrolytic capacitor E1 and the electrolytic capacitor E2, and accelerating the starting time.
Description
Technical Field
The utility model relates to the technical field of LED driving circuits, in particular to an LED driving circuit capable of accelerating starting speed.
Background
The existing illumination products with switchable power generally realize the switching power by an external switch (or external different electric signals), when the illumination products are turned to a small-gear power for power-on starting, the charging speed of an electrolytic capacitor connected in parallel with an LED light source is reduced due to smaller input current, so that the starting time is prolonged.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: an LED driving circuit capable of increasing the starting speed is provided.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the LED driving circuit capable of accelerating the starting speed comprises an LED linear driving module, a power switching module and an electrolytic capacitor E1, wherein the output end of the power switching module is electrically connected with a chip selection signal end of the LED linear driving module, and the LED driving circuit further comprises a quick starting module, and the quick starting module comprises a field effect tube Q2 and the electrolytic capacitor E2;
the feedback signal end of the LED linear driving module is respectively and electrically connected with the source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2 and the cathode of the external LED light source, the grid electrode of the field effect tube Q2 is electrically connected with the input end of the power switching module, the grid electrode and the input end of the power switching module are both electrically connected with the live wire end of the external electric signal output module, the drain electrode of the field effect tube Q2 is respectively and electrically connected with the other end of the electrolytic capacitor E2 and one end of the electrolytic capacitor E1, and the other end of the electrolytic capacitor E1 is respectively and electrically connected with the anode of the external LED light source and the zero line end of the external electric signal output module.
Further, the quick starting module further comprises a resistor R6, a resistor R7 and a resistor R8, one end of the resistor R6 is electrically connected with one end of the resistor R7, the other end of the resistor R7 is electrically connected with the grid electrode of the field effect tube Q2 and one end of the resistor R8 respectively, the other end of the resistor R8 is electrically connected with the source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2, the feedback signal end of the LED linear driving module and the negative electrode of the peripheral LED light source respectively, and the other end of the resistor R6 is electrically connected with the input end of the power switching module and the live wire end of the peripheral electric signal output module respectively.
Further, the quick starting module further comprises a capacitor C2, one end of the capacitor C2 is electrically connected with the other end of the resistor R7, one end of the resistor R8 and the grid electrode of the field effect tube Q2 respectively, and the other end of the capacitor C2 is electrically connected with the other end of the resistor R8, the source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2, the feedback signal end of the LED linear driving module and the negative electrode of the peripheral LED light source respectively.
Further, the quick starting module further comprises a voltage stabilizing tube ZD2, wherein the cathode of the voltage stabilizing tube ZD2 is electrically connected with the other end of the resistor R7, one end of the resistor R8 and the grid electrode of the field effect tube Q2 respectively, and the anode of the voltage stabilizing tube ZD2 is electrically connected with the other end of the resistor R8, the source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2, the feedback signal end of the LED linear driving module and the cathode of the external LED light source respectively.
Further, the power switching module comprises a field effect transistor Q1, wherein the grid electrode of the field effect transistor Q1 is respectively and electrically connected with the grid electrode of the field effect transistor Q2 and the live wire end of the external electric signal output module, the source electrode of the field effect transistor Q1 is grounded, and the drain electrode of the field effect transistor Q1 is electrically connected with the chip selection signal end of the LED linear driving module.
Further, the power switching module further comprises a resistor R1, a resistor R2 and a resistor R3, wherein one end of the resistor R1 is electrically connected with the grid electrode of the field effect tube Q2 and the live wire end of the external electric signal output module respectively, the other end of the resistor R1 is electrically connected with one end of the resistor R2, the other end of the resistor R2 is electrically connected with one end of the resistor R3 and the grid electrode of the field effect tube Q1 respectively, the other end of the resistor R3 is electrically connected with the source electrode of the field effect tube Q1, and the other end of the resistor R3 is grounded.
Further, the power switching module further includes a capacitor C1, one end of the capacitor C1 is electrically connected to the other end of the resistor R2, one end of the resistor R3 and the gate of the field effect transistor Q1, the other end of the capacitor C1 is electrically connected to the other end of the resistor R3 and the source of the field effect transistor Q1, and the other end of the capacitor C1 is grounded.
Further, the power switching module further includes a voltage regulator tube ZD1, wherein a cathode of the voltage regulator tube ZD1 is electrically connected with the other end of the resistor R2, one end of the resistor R3 and a gate of the field effect tube Q1, an anode of the voltage regulator tube ZD1 is electrically connected with the other end of the resistor R3 and a source of the field effect tube Q1, and an anode of the voltage regulator tube ZD1 is grounded.
Further, the power switching module further comprises a diode D5, an anode of the diode D5 is electrically connected with a gate of the field effect transistor Q2 and a live wire end of the external electric signal output module, and a cathode of the diode D5 is electrically connected with one end of the resistor R1.
Further, the LED linear driving module comprises a chip IC and a sampling unit, wherein a chip selection signal end of the chip IC is electrically connected with one end of the sampling unit, the other end of the sampling unit is electrically connected with an output end of the power switching module, and a feedback signal end of the chip IC is respectively electrically connected with a source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2 and a cathode of an external LED light source.
The utility model has the beneficial effects that:
according to the scheme, the quick starting module comprises a field effect tube Q2 and an electrolytic capacitor E2, and is matched with the power switching module and the LED linear driving module, so that when an external electric signal output module outputs an electric signal, the power switching module works, the field effect tube Q2 is conducted, the electrolytic capacitor E2 does not work, and the electrolytic capacitor E1 works, so that only one electrolytic capacitor in a loop works, and a larger capacitance value is selected for the electrolytic capacitor E1 in order to meet the stroboscopic requirement of high-grade power; when the power switching module and the field effect transistor Q2 work, the current of the whole loop is larger, so that enough current can be provided for charging the electrolytic capacitor E1 at the moment of power-on, and the starting speed is not slowed down; when the external electric signal output module does not output an electric signal, the power switching module does not work, the field effect transistor Q2 is not conducted, the current of the whole loop is smaller, but when the field effect transistor Q2 is not conducted, the electrolytic capacitor E2 works, the output is formed by connecting the electrolytic capacitor E1 and the electrolytic capacitor E2 in series, the capacitance value of the electrolytic capacitor E1 and the electrolytic capacitor E2 after the electrolytic capacitor E1 and the electrolytic capacitor E2 are connected in series becomes smaller, and the current required for charging the electrolytic capacitor E1 and the electrolytic capacitor E2 is also smaller, so that the charging speed for the electrolytic capacitor E1 and the electrolytic capacitor E2 is accelerated, and the starting time is accelerated; the LED driving circuit designed by the scheme can be applied to a traditional illumination product with switchable power, and the starting speed of the illumination product can be increased, so that illumination experience is optimized.
Drawings
FIG. 1 is a schematic circuit diagram of an LED driver circuit capable of increasing the start-up speed according to the present utility model;
description of the reference numerals:
1. an LED linear driving module; 2. a power switching module; 3. a quick start module; 4. an LED light source; 5. an overcurrent protection module; 6. an overvoltage protection module; 7. and the rectification filtering module.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1, the technical scheme adopted by the utility model is as follows:
the LED driving circuit capable of accelerating the starting speed comprises an LED linear driving module, a power switching module and an electrolytic capacitor E1, wherein the output end of the power switching module is electrically connected with a chip selection signal end of the LED linear driving module, and the LED driving circuit further comprises a quick starting module, and the quick starting module comprises a field effect tube Q2 and the electrolytic capacitor E2;
the feedback signal end of the LED linear driving module is respectively and electrically connected with the source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2 and the cathode of the external LED light source, the grid electrode of the field effect tube Q2 is electrically connected with the input end of the power switching module, the grid electrode and the input end of the power switching module are both electrically connected with the live wire end of the external electric signal output module, the drain electrode of the field effect tube Q2 is respectively and electrically connected with the other end of the electrolytic capacitor E2 and one end of the electrolytic capacitor E1, and the other end of the electrolytic capacitor E1 is respectively and electrically connected with the anode of the external LED light source and the zero line end of the external electric signal output module.
From the above description, the beneficial effects of the utility model are as follows:
according to the scheme, the quick starting module comprises a field effect tube Q2 and an electrolytic capacitor E2, and is matched with the power switching module and the LED linear driving module, so that when an external electric signal output module outputs an electric signal, the power switching module works, the field effect tube Q2 is conducted, the electrolytic capacitor E2 does not work, and the electrolytic capacitor E1 works, so that only one electrolytic capacitor in a loop works, and a larger capacitance value is selected for the electrolytic capacitor E1 in order to meet the stroboscopic requirement of high-grade power; when the power switching module and the field effect transistor Q2 work, the current of the whole loop is larger, so that enough current can be provided for charging the electrolytic capacitor E1 at the moment of power-on, and the starting speed is not slowed down; when the external electric signal output module does not output an electric signal, the power switching module does not work, the field effect transistor Q2 is not conducted, the current of the whole loop is smaller, but when the field effect transistor Q2 is not conducted, the electrolytic capacitor E2 works, the output is formed by connecting the electrolytic capacitor E1 and the electrolytic capacitor E2 in series, the capacitance value of the electrolytic capacitor E1 and the electrolytic capacitor E2 after the electrolytic capacitor E1 and the electrolytic capacitor E2 are connected in series becomes smaller, and the current required for charging the electrolytic capacitor E1 and the electrolytic capacitor E2 is also smaller, so that the charging speed for the electrolytic capacitor E1 and the electrolytic capacitor E2 is accelerated, and the starting time is accelerated; the LED driving circuit designed by the scheme can be applied to a traditional illumination product with switchable power, and the starting speed of the illumination product can be increased, so that illumination experience is optimized.
Further, the quick starting module further comprises a resistor R6, a resistor R7 and a resistor R8, one end of the resistor R6 is electrically connected with one end of the resistor R7, the other end of the resistor R7 is electrically connected with the grid electrode of the field effect tube Q2 and one end of the resistor R8 respectively, the other end of the resistor R8 is electrically connected with the source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2, the feedback signal end of the LED linear driving module and the negative electrode of the peripheral LED light source respectively, and the other end of the resistor R6 is electrically connected with the input end of the power switching module and the live wire end of the peripheral electric signal output module respectively.
As is apparent from the above description, by providing the resistor R6, the resistor R7, and the resistor R8, and connecting the resistor R6, the resistor R7, and the resistor R8 in series, it is possible to function as a voltage division.
Further, the quick starting module further comprises a capacitor C2, one end of the capacitor C2 is electrically connected with the other end of the resistor R7, one end of the resistor R8 and the grid electrode of the field effect tube Q2 respectively, and the other end of the capacitor C2 is electrically connected with the other end of the resistor R8, the source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2, the feedback signal end of the LED linear driving module and the negative electrode of the peripheral LED light source respectively.
From the above description, the electrical signal output by the external electrical signal output module is divided by the resistor R6, the resistor R7 and the resistor R8 in series, and the capacitor C2 is connected in parallel to two ends of the resistor R8, so that the voltage at two ends of the resistor R8 is more stable.
Further, the quick starting module further comprises a voltage stabilizing tube ZD2, wherein the cathode of the voltage stabilizing tube ZD2 is electrically connected with the other end of the resistor R7, one end of the resistor R8 and the grid electrode of the field effect tube Q2 respectively, and the anode of the voltage stabilizing tube ZD2 is electrically connected with the other end of the resistor R8, the source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2, the feedback signal end of the LED linear driving module and the cathode of the external LED light source respectively.
As is clear from the above description, the regulator ZD2 can protect the resistor R8.
Further, the power switching module comprises a field effect transistor Q1, wherein the grid electrode of the field effect transistor Q1 is respectively and electrically connected with the grid electrode of the field effect transistor Q2 and the live wire end of the external electric signal output module, the source electrode of the field effect transistor Q1 is grounded, and the drain electrode of the field effect transistor Q1 is electrically connected with the chip selection signal end of the LED linear driving module.
As can be seen from the above description, when the external electric signal output module outputs an electric signal, the field effect transistor Q1 and the field effect transistor Q2 are both turned on, the electrolytic capacitor E2 does not work, and the electrolytic capacitor E1 works, so that only one electrolytic capacitor in the loop works, and in order to meet the strobe requirement of high-grade power, the electrolytic capacitor E1 needs to have a larger capacitance value; when the field effect tube Q1 and the field effect tube Q2 work, the current of the whole loop is larger, so that enough current can be provided for charging the electrolytic capacitor E1 at the moment of power-on, and the starting speed is not slowed down; when the external electric signal output module does not output electric signals, the field effect transistor Q1 and the field effect transistor Q2 are not conducted, the current of the whole loop is smaller, but when the field effect transistor Q2 is not conducted, the electrolytic capacitor E2 works, the output is formed by connecting the electrolytic capacitor E1 and the electrolytic capacitor E2 in series, the capacitance value of the electrolytic capacitor E1 and the electrolytic capacitor E2 after the electrolytic capacitor E1 and the electrolytic capacitor E2 are connected in series is reduced, the current required for charging the electrolytic capacitor E1 and the electrolytic capacitor E2 is reduced, and therefore the charging speed of the electrolytic capacitor E1 and the electrolytic capacitor E2 is accelerated, and the starting time is shortened.
Further, the power switching module further comprises a resistor R1, a resistor R2 and a resistor R3, wherein one end of the resistor R1 is electrically connected with the grid electrode of the field effect tube Q2 and the live wire end of the external electric signal output module respectively, the other end of the resistor R1 is electrically connected with one end of the resistor R2, the other end of the resistor R2 is electrically connected with one end of the resistor R3 and the grid electrode of the field effect tube Q1 respectively, the other end of the resistor R3 is electrically connected with the source electrode of the field effect tube Q1, and the other end of the resistor R3 is grounded.
As is apparent from the above description, by providing the resistor R1, the resistor R2, and the resistor R3, and connecting the resistor R1, the resistor R2, and the resistor R3 in series, it is possible to function as a voltage division.
Further, the power switching module further includes a capacitor C1, one end of the capacitor C1 is electrically connected to the other end of the resistor R2, one end of the resistor R3 and the gate of the field effect transistor Q1, the other end of the capacitor C1 is electrically connected to the other end of the resistor R3 and the source of the field effect transistor Q1, and the other end of the capacitor C1 is grounded.
From the above description, the electrical signal output by the external electrical signal output module is divided by the resistor R1, the resistor R2 and the resistor R3 in series, and the capacitor C1 is connected in parallel to two ends of the resistor R3, so that the voltage at two ends of the resistor R3 is more stable.
Further, the power switching module further includes a voltage regulator tube ZD1, wherein a cathode of the voltage regulator tube ZD1 is electrically connected with the other end of the resistor R2, one end of the resistor R3 and a gate of the field effect tube Q1, an anode of the voltage regulator tube ZD1 is electrically connected with the other end of the resistor R3 and a source of the field effect tube Q1, and an anode of the voltage regulator tube ZD1 is grounded.
As is clear from the above description, the regulator ZD1 can protect the resistor R3.
Further, the power switching module further comprises a diode D5, an anode of the diode D5 is electrically connected with a gate of the field effect transistor Q2 and a live wire end of the external electric signal output module, and a cathode of the diode D5 is electrically connected with one end of the resistor R1.
Further, the LED linear driving module comprises a chip IC and a sampling unit, wherein a chip selection signal end of the chip IC is electrically connected with one end of the sampling unit, the other end of the sampling unit is electrically connected with an output end of the power switching module, and a feedback signal end of the chip IC is respectively electrically connected with a source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2 and a cathode of an external LED light source.
Referring to fig. 1, a first embodiment of the present utility model is as follows:
the LED driving circuit capable of accelerating the starting speed comprises an LED linear driving module 1, a power switching module 2 and an electrolytic capacitor E1 (the capacitance value is 47 mu F), wherein the output end of the power switching module 2 is electrically connected with a chip selection signal end of the LED linear driving module 1, the LED driving circuit further comprises a quick starting module 3, and the quick starting module 3 comprises a field effect tube Q2 (model 4N 60) and the electrolytic capacitor E2 (the capacitance value is 47 mu F);
the feedback signal end of the LED linear driving module 1 is respectively and electrically connected with the source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2 and the cathode of the peripheral LED light source 4, the grid electrode of the field effect tube Q2 is electrically connected with the input end of the power switching module 2 and both are electrically connected with the live wire end of the peripheral electric signal output module, the drain electrode of the field effect tube Q2 is respectively and electrically connected with the other end of the electrolytic capacitor E2 and one end of the electrolytic capacitor E1, and the other end of the electrolytic capacitor E1 is respectively and electrically connected with the anode of the peripheral LED light source 4 and the zero line end of the peripheral electric signal output module.
The quick starting module 3 further comprises a resistor R6 (the resistance value is 510kΩ), a resistor R7 (the resistance value is 510kΩ) and a resistor R8 (the resistance value is 200kΩ), one end of the resistor R6 is electrically connected with one end of the resistor R7, the other end of the resistor R7 is electrically connected with the grid electrode of the field effect tube Q2 and one end of the resistor R8 respectively, the other end of the resistor R8 is electrically connected with the source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2, the feedback signal end of the LED linear driving module 1 and the negative electrode of the peripheral LED light source 4 respectively, and the other end of the resistor R6 is electrically connected with the input end of the power switching module 2 and the live wire end of the peripheral electric signal output module respectively.
The quick starting module 3 further comprises a capacitor C2 (the capacitance value is 220 nF), one end of the capacitor C2 is respectively and electrically connected with the other end of the resistor R7, one end of the resistor R8 and the grid electrode of the field effect tube Q2, and the other end of the capacitor C2 is respectively and electrically connected with the other end of the resistor R8, the source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2, the feedback signal end of the LED linear driving module 1 and the negative electrode of the peripheral LED light source 4.
The quick starting module 3 further comprises a voltage stabilizing tube ZD2 (the voltage stabilizing value is 18V), wherein the cathode of the voltage stabilizing tube ZD2 is respectively and electrically connected with the other end of the resistor R7, one end of the resistor R8 and the grid electrode of the field effect tube Q2, and the anode of the voltage stabilizing tube ZD2 is respectively and electrically connected with the other end of the resistor R8, the source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2, the feedback signal end of the LED linear driving module 1 and the cathode of the peripheral LED light source 4.
The power switching module 2 comprises a field effect transistor Q1 (model 2304), wherein the grid electrode of the field effect transistor Q1 is respectively and electrically connected with the grid electrode of the field effect transistor Q2 and the live wire end of the external electric signal output module, the source electrode of the field effect transistor Q1 is grounded, and the drain electrode of the field effect transistor Q1 is electrically connected with the chip selection signal end of the LED linear driving module 1.
The power switching module 2 further comprises a resistor R1 (with a resistance value of 560kΩ), a resistor R2 (with a resistance value of 560kΩ) and a resistor R3 (with a resistance value of 120kΩ), wherein one end of the resistor R1 is respectively electrically connected with the grid electrode of the field effect tube Q2 and the live wire end of the external electric signal output module, the other end of the resistor R1 is electrically connected with one end of the resistor R2, the other end of the resistor R2 is respectively electrically connected with one end of the resistor R3 and the grid electrode of the field effect tube Q1, and the other end of the resistor R3 is electrically connected with the source electrode of the field effect tube Q1 and the other end of the resistor R3 is grounded.
The power switching module 2 further comprises a capacitor C1 (the capacitance value is 220 nF), one end of the capacitor C1 is electrically connected with the other end of the resistor R2, one end of the resistor R3 and the grid electrode of the field effect transistor Q1 respectively, the other end of the capacitor C1 is electrically connected with the other end of the resistor R3 and the source electrode of the field effect transistor Q1 respectively, and the other end of the capacitor C1 is grounded.
The power switching module 2 further comprises a voltage stabilizing tube ZD1 (the voltage stabilizing value is 18V, the voltage stabilizing tube plays a role of clamping protection, if the voltage value at two ends exceeds 18V, the voltage stabilizing tube plays a role of clamping the voltage value at 18V, and if the voltage value does not exceed 18V, the voltage stabilizing tube does not play a role), a cathode of the voltage stabilizing tube ZD1 is respectively and electrically connected with the other end of the resistor R2, one end of the resistor R3 and a grid electrode of the field effect tube Q1, an anode of the voltage stabilizing tube ZD1 is respectively and electrically connected with the other end of the resistor R3 and a source electrode of the field effect tube Q1, and an anode of the voltage stabilizing tube ZD1 is grounded.
The power switching module 2 further comprises a diode D5 (model M7), wherein the anode of the diode D5 is electrically connected with the grid electrode of the field effect transistor Q2 and the live wire end of the external electric signal output module respectively, and the cathode of the diode D5 is electrically connected with one end of the resistor R1.
The LED linear driving module 1 comprises a chip IC (model BP 5178) and a sampling unit, wherein a chip selection signal end of the chip IC is electrically connected with one end of the sampling unit, the other end of the sampling unit is electrically connected with the output end of the power switching module 2, and a feedback signal end of the chip IC is respectively electrically connected with a source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2 and a cathode of the peripheral LED light source 4.
The sampling unit comprises a resistor R4 (the resistance value is 7.5 omega) and a resistor R5 (the resistance value is 36 omega), one end of the resistor R4 is electrically connected with a chip selection signal end of the chip IC, the other end of the resistor R4 is respectively electrically connected with one end of the resistor R5 and the drain electrode of the field effect tube Q1, the other end of the resistor R5 is electrically connected with the source electrode of the field effect tube Q1, and the other end of the resistor R5 is grounded.
The LED driving circuit capable of accelerating the starting speed, which is designed by the scheme, further comprises an overcurrent protection module 5, an overvoltage protection module 6 and a rectification filter module 7, wherein the overcurrent protection module 5 comprises a fuse F1 and a fuse F2, the overvoltage protection module 6 comprises a piezoresistor RV1 (model 7D 271K) and a piezoresistor RV2 (model 7D 271K), and the rectification filter module 7 comprises a rectification bridge BR (model MB 10F), a diode D2 (model M7) and a diode D1 (model M7), and the specific connection relation among all components is shown in the figure 1.
Through setting up overcurrent protection module 5, when the electric current in the circuit is too big, fuse F1 and fuse F2 will blow to can automatic cutout power, just so play the effect of protection circuit.
By arranging the overvoltage protection module 6, when the circuit works normally, the piezoresistor is in a high-resistance state, so that the normal work of the circuit is not influenced; when abnormal transient overvoltage occurs in the circuit, the piezoresistor is changed from a high-resistance state to a low-resistance state rapidly, and the abnormal transient voltage is clamped at a safe level, so that the effect of protecting the later-stage circuit is achieved.
By providing the rectifying and filtering module 7, the current direction can be adjusted so that the alternating current is rectified into pulsating direct current.
The working principle of the LED driving circuit capable of accelerating the starting speed is as follows:
the power switching module 2 can control whether the field effect transistor Q1 is conducted or not according to the electric signal output by the peripheral electric signal output module, so that the resistance value of the resistor connected to the chip selection signal end of the chip IC is changed, and therefore two different power levels can be obtained.
The LED linear driving module 1 controls the whole driving output current through the reference voltage on the chip selection signal end of the chip IC and the resistance value of the resistor connected in series on the pin of the chip IC.
The external electric signal output module outputs an electric signal (such as commercial power) and then the electric signal is rectified by the bridge pile after being subjected to overvoltage protection, and the rectified direct current is sent to the traditional LED linear driving module 1 through the LED light source 4 and then returned to the ground of the bridge pile; and how much current flows through the LED light source 4 depends on the sampling resistance on the chip select signal terminal of the chip IC in the LED linear driving module 1; when the electric signals output by the external electric signal output module control J1 (namely a live wire) and N (namely a zero line) to be connected into the mains supply, the J1 is divided by the resistor R1, the resistor R2 and the resistor R3 in series, and the capacitor C1 is connected in parallel at two ends of the resistor R3, so that the voltage at two ends of the resistor R3 is more stable, meanwhile, the voltage stabilizing tube ZD1 plays a protective role, and the voltage at two ends of the resistor R3 meets the requirement of the conduction of the field effect tube Q1, so that the sampling resistor on the CS pin of the chip IC only has the resistor R4, and the current of the whole loop is larger, and the power of the whole lamp is higher; meanwhile, J1 is divided by the series connection of a resistor R6, a resistor R7 and a resistor R8, and a capacitor C2 is connected in parallel with the two ends of the resistor R8, so that the voltage at the two ends of the resistor R8 is more stable, meanwhile, the voltage stabilizing tube ZD2 plays a role in protecting the conduction of the field effect tube Q2, so that only the electrolytic capacitor E1 in a loop works, and a larger capacitance value is selected for the electrolytic capacitor E1 in order to meet the stroboscopic requirement of large-scale power; when the field effect tube Q1 and the field effect tube Q2 work, the current of the whole loop is larger, so that enough current can be provided for charging the electrolytic capacitor E1 at the moment of power-on, and the starting speed is not slowed down;
when the electric signal output by the external electric signal output module controls the connection of J2 (namely a live wire) and N (namely a zero line) to the mains supply, no current flows through the field effect tube Q1 and the field effect tube Q2, so that the field effect tube Q1 and the field effect tube Q2 are not conducted, the sampling resistor on the CS pin of the chip IC is formed by connecting the resistor R4 and the resistor R5 in series, the current of the whole loop is reduced, but when the field effect tube Q2 is not conducted, the electrolytic capacitor E2 works, the output is formed by connecting the electrolytic capacitor E1 and the electrolytic capacitor E2 in series, the capacitance value of the electrolytic capacitor E1 and the electrolytic capacitor E2 after the connection in series is reduced, and the current required for charging the electrolytic capacitor E1 and the electrolytic capacitor E2 is reduced, so that the charging speed of the electrolytic capacitor E1 and the electrolytic capacitor E2 is accelerated, and the starting time is shortened.
In summary, according to the LED driving circuit capable of accelerating the starting speed provided by the utility model, the fast starting module is provided, and the fast starting module comprises the field effect transistor Q2 and the electrolytic capacitor E2, and is matched with the power switching module and the LED linear driving module, so that when the peripheral electric signal output module outputs an electric signal, the power switching module works, the field effect transistor Q2 is conducted, the electrolytic capacitor E2 does not work, the electrolytic capacitor E1 works, only one electrolytic capacitor in a loop works, and in order to meet the stroboscopic requirement of high-grade power, the electrolytic capacitor E1 needs to have a larger capacitance value; when the power switching module and the field effect transistor Q2 work, the current of the whole loop is larger, so that enough current can be provided for charging the electrolytic capacitor E1 at the moment of power-on, and the starting speed is not slowed down; when the external electric signal output module does not output an electric signal, the power switching module does not work, the field effect transistor Q2 is not conducted, the current of the whole loop is smaller, but when the field effect transistor Q2 is not conducted, the electrolytic capacitor E2 works, the output is formed by connecting the electrolytic capacitor E1 and the electrolytic capacitor E2 in series, the capacitance value of the electrolytic capacitor E1 and the electrolytic capacitor E2 after the electrolytic capacitor E1 and the electrolytic capacitor E2 are connected in series becomes smaller, and the current required for charging the electrolytic capacitor E1 and the electrolytic capacitor E2 is also smaller, so that the charging speed for the electrolytic capacitor E1 and the electrolytic capacitor E2 is accelerated, and the starting time is accelerated; the LED driving circuit designed by the scheme can be applied to a traditional illumination product with switchable power, and the starting speed of the illumination product can be increased, so that illumination experience is optimized.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.
Claims (10)
1. The LED driving circuit capable of accelerating the starting speed comprises an LED linear driving module, a power switching module and an electrolytic capacitor E1, wherein the output end of the power switching module is electrically connected with a chip selection signal end of the LED linear driving module;
the feedback signal end of the LED linear driving module is respectively and electrically connected with the source electrode of the field effect tube Q2, one end of the electrolytic capacitor E2 and the cathode of the external LED light source, the grid electrode of the field effect tube Q2 is electrically connected with the input end of the power switching module, the grid electrode and the input end of the power switching module are both electrically connected with the live wire end of the external electric signal output module, the drain electrode of the field effect tube Q2 is respectively and electrically connected with the other end of the electrolytic capacitor E2 and one end of the electrolytic capacitor E1, and the other end of the electrolytic capacitor E1 is respectively and electrically connected with the anode of the external LED light source and the zero line end of the external electric signal output module.
2. The LED driving circuit of claim 1, wherein the fast starting module further comprises a resistor R6, a resistor R7 and a resistor R8, one end of the resistor R6 is electrically connected with one end of the resistor R7, the other end of the resistor R7 is electrically connected with the gate of the fet Q2 and one end of the resistor R8, the other end of the resistor R8 is electrically connected with the source of the fet Q2, one end of the electrolytic capacitor E2, the feedback signal end of the LED linear driving module and the negative electrode of the peripheral LED light source, and the other end of the resistor R6 is electrically connected with the input end of the power switching module and the live wire end of the peripheral electrical signal output module.
3. The LED driving circuit of claim 2, wherein the fast starting module further comprises a capacitor C2, one end of the capacitor C2 is electrically connected to the other end of the resistor R7, one end of the resistor R8 and the gate of the field effect transistor Q2, and the other end of the capacitor C2 is electrically connected to the other end of the resistor R8, the source of the field effect transistor Q2, one end of the electrolytic capacitor E2, the feedback signal end of the LED linear driving module and the negative electrode of the external LED light source.
4. The LED driving circuit capable of increasing the starting speed according to claim 2, wherein the fast starting module further comprises a voltage stabilizing tube ZD2, wherein the cathode of the voltage stabilizing tube ZD2 is electrically connected with the other end of the resistor R7, one end of the resistor R8 and the gate of the field effect tube Q2, and the anode of the voltage stabilizing tube ZD2 is electrically connected with the other end of the resistor R8, the source of the field effect tube Q2, one end of the electrolytic capacitor E2, the feedback signal end of the LED linear driving module and the cathode of the external LED light source.
5. The LED driving circuit of claim 1, wherein the power switching module comprises a field effect transistor Q1, the gate of the field effect transistor Q1 is electrically connected to the gate of the field effect transistor Q2 and the live wire end of the external electric signal output module, the source of the field effect transistor Q1 is grounded, and the drain of the field effect transistor Q1 is electrically connected to the chip select signal end of the LED linear driving module.
6. The LED driving circuit of claim 5, wherein the power switching module further comprises a resistor R1, a resistor R2 and a resistor R3, wherein one end of the resistor R1 is electrically connected to the gate of the fet Q2 and the live end of the external electric signal output module, the other end of the resistor R1 is electrically connected to one end of the resistor R2, the other end of the resistor R2 is electrically connected to one end of the resistor R3 and the gate of the fet Q1, the other end of the resistor R3 is electrically connected to the source of the fet Q1, and the other end of the resistor R3 is grounded.
7. The LED driving circuit of claim 6, wherein the power switching module further comprises a capacitor C1, one end of the capacitor C1 is electrically connected to the other end of the resistor R2, one end of the resistor R3 and the gate of the fet Q1, the other end of the capacitor C1 is electrically connected to the other end of the resistor R3 and the source of the fet Q1, and the other end of the capacitor C1 is grounded.
8. The LED driving circuit of claim 6, wherein the power switching module further comprises a regulator tube ZD1, the cathode of the regulator tube ZD1 is electrically connected to the other end of the resistor R2, one end of the resistor R3 and the gate of the field-effect transistor Q1, the anode of the regulator tube ZD1 is electrically connected to the other end of the resistor R3 and the source of the field-effect transistor Q1, and the anode of the regulator tube ZD1 is grounded.
9. The LED driving circuit of claim 6, wherein the power switching module further comprises a diode D5, the anode of the diode D5 is electrically connected to the gate of the fet Q2 and the live end of the external electric signal output module, and the cathode of the diode D5 is electrically connected to one end of the resistor R1.
10. The LED driving circuit of claim 1, wherein the LED linear driving module comprises a chip IC and a sampling unit, wherein a chip select signal end of the chip IC is electrically connected with one end of the sampling unit, the other end of the sampling unit is electrically connected with an output end of the power switching module, and a feedback signal end of the chip IC is electrically connected with a source electrode of the field effect transistor Q2, one end of the electrolytic capacitor E2 and a cathode of the external LED light source, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322187473.4U CN220711686U (en) | 2023-08-15 | 2023-08-15 | LED drive circuit capable of accelerating starting speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322187473.4U CN220711686U (en) | 2023-08-15 | 2023-08-15 | LED drive circuit capable of accelerating starting speed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220711686U true CN220711686U (en) | 2024-04-02 |
Family
ID=90437850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322187473.4U Active CN220711686U (en) | 2023-08-15 | 2023-08-15 | LED drive circuit capable of accelerating starting speed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220711686U (en) |
-
2023
- 2023-08-15 CN CN202322187473.4U patent/CN220711686U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104735873B (en) | A kind of change-over circuit and lamp of compatible fluorescent lamp ballast | |
| CN112512163A (en) | Output overvoltage protection control circuit and drive circuit | |
| CN209627761U (en) | LED Drive Protecting Circuit | |
| US5055994A (en) | A.c. to d.c. converter | |
| US11632843B2 (en) | Delayed lighting system | |
| CN212413046U (en) | Soft-off active clamping protection circuit and power supply system | |
| CN220711686U (en) | LED drive circuit capable of accelerating starting speed | |
| CN112019010A (en) | Soft-off active clamping protection circuit and power supply system | |
| CN204518148U (en) | A kind of change-over circuit of compatible fluorescent lamp ballast and lamp | |
| CN103037558B (en) | Over-current protection circuit of light-emitting diode (LED) constant-current driving circuit | |
| CN217427985U (en) | Slow starting circuit and switching power supply | |
| CN110611292A (en) | PFC circuit and protection circuit thereof | |
| CN214506546U (en) | No-load protection circuit | |
| CN211655724U (en) | PFC circuit and protection circuit thereof | |
| CN211656110U (en) | Adjusting protection circuit for photoelectric switch | |
| US11350501B2 (en) | LED driving circuit based on t-shaped lamp tube | |
| KR20110112238A (en) | Power supply device for light sources, such as halogen lamps, and related method | |
| CN108040399B (en) | Overvoltage protection circuit and LED constant current drive circuit | |
| CN207235158U (en) | A kind of LED backlight Drive Protecting Circuit and display device | |
| CN111405705A (en) | Dimming L ED controller and output short-circuit protection method | |
| CN215647489U (en) | LED driving power supply and electrical equipment | |
| EP3876677A1 (en) | Led driving circuit and led lamp | |
| CN220440963U (en) | Multimode light source drive circuit and dimming equipment | |
| CN217935073U (en) | Overcurrent protection circuit and light-emitting device | |
| CN213638293U (en) | LED drive protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |