CN107820348B - Linear full-voltage variable-frequency constant-current circuit and LED lamp with same - Google Patents
Linear full-voltage variable-frequency constant-current circuit and LED lamp with same Download PDFInfo
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- CN107820348B CN107820348B CN201711265867.XA CN201711265867A CN107820348B CN 107820348 B CN107820348 B CN 107820348B CN 201711265867 A CN201711265867 A CN 201711265867A CN 107820348 B CN107820348 B CN 107820348B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
Abstract
The invention provides a linear full-voltage variable-frequency constant-current circuit and an LED lamp with the same, comprising: a rectifying circuit; at least one load is connected with the output end of the rectifying circuit; the first switching constant-current tube IC1 and the second switching constant-current tube IC2 are symmetrically arranged; the S end of the first switching constant current tube IC1 and the S end of the second switching constant current tube IC2 are respectively connected to the input end of the load component; the D end of the first open Guan Heng flow tube IC1 is connected to the output end of the rectifying circuit through a charge-discharge capacitor C1, and the D end of the second switch constant flow tube IC2 is connected to the output end of the rectifying circuit; the invention adopts two switching constant current tubes to control the capacitor to switch charge and discharge according to the change of alternating voltage, thereby realizing the functions of automatic frequency conversion and constant current under the condition of 90-300V alternating current full voltage. In the charge-discharge switching process of the charge-discharge capacitor, the load component is enabled to work in a switch linear constant current state, and the circuit efficiency and the input power factor are greatly improved.
Description
Technical Field
The invention relates to the field of output control circuits of alternating current power supplies, in particular to a linear full-voltage variable-frequency constant-current circuit and an LED lamp with the same.
Background
As a high-efficiency new light source, the LED has long service life, low energy consumption, energy conservation and environmental protection, and is widely applied to illumination in various fields. The mode of controlling the brightness of the LED lamp through the PWM and the constant current driving chip by using the singlechip and embedded software is also gradually popularized. However, since the operation frequency of the single-chip microcomputer is limited, the PWM frequency and the dimming precision adopted are limited to the operation frequency of the single-chip microcomputer, that is, the PWM frequency multiplied by the dimming precision must be less than or equal to the operation frequency of the single-chip microcomputer. Therefore, the existing system for controlling the brightness of the LED lamp by using the singlechip through the PWM and the constant-current driving chip has the following defects that stroboscopic is firstly generated when the lamp has high brightness, and the system can be perceived by naked eyes and can leave obvious bright and dark staggered stripes on digital image equipment; secondly, when the brightness is changed, the accuracy is insufficient, so that perceptible brightness fluctuation can be generated, and the brightness adjusting effect is affected. That is, the mode of modulating the frequency of the lamp by adopting the singlechip and embedded software has high cost and poor effect, and the linear constant current driving power supply has high cost performance, but can not realize the globalization and the universality of 110-220VAC wide voltage like a switch power supply, and urgent improvement is needed.
Disclosure of Invention
In order to solve the problems, the invention provides a linear full-voltage variable-frequency constant-current circuit and an LED lamp with the same. The invention adopts two switching constant current tubes to control the capacitor to switch charge and discharge according to the change of alternating voltage, realizes the functions of automatic frequency conversion and constant current under the condition of 90-300V alternating current full voltage, and has low cost and easy popularization. In the charge-discharge switching process of the charge-discharge capacitor, the load component is enabled to work in a switch linear constant current state, and the circuit efficiency and the input power factor are greatly improved.
In order to achieve the technical purpose, the technical scheme of the invention is as follows: a linear full-voltage variable frequency constant current circuit, comprising:
the input end of the rectifying circuit 1 is connected to the mains supply;
the load assembly 2 comprises at least one load, and the output end of the load assembly is connected with the output end of the rectifying circuit;
the first switching constant-current tube IC1 and the second switching constant-current tube IC2 are symmetrically arranged;
the S end of the first switching constant current tube IC1 and the S end of the second switching constant current tube IC2 are respectively connected to the input end of the load component; the D end of the first open Guan Heng flow tube IC1 is connected to the output end of the rectifying circuit through a charge-discharge capacitor C1, and the D end of the second switch constant flow tube IC2 is connected to the output end of the rectifying circuit; the CS end of the first switching constant current tube IC1 and the CS end of the second switching constant current tube IC2 are connected with each other and grounded through a third resistor R3.
Further, an output end of the rectifying circuit is connected with an output voltage detection resistor and grounded;
the output voltage detection resistor comprises a fourth resistor R4 and a fifth resistor R5 which are connected in series;
the FB terminal of the second switching constant current tube IC2 is connected between the fourth resistor R4 and the fifth resistor R5.
Further, a first steering diode D1 is connected between the D end of the first open Guan Heng flow tube IC1 and the charge-discharge capacitor C1.
Further, one end of the load component is connected with a second guide diode D2;
the second steering diode D2 is connected between the charge-discharge capacitor C1 and the first steering diode D1.
Further, when the load component is a load, the input end of the load component is the positive end of the load, and the output end of the load component is the negative end of the load;
when the load assembly comprises a plurality of loads connected in series, the input end of the load assembly is the positive end of the first load, and the output end of the load assembly is the negative end of the last load.
Further, the output voltage detection resistor,
clamping the FB terminal voltage of the second switching constant-current tube IC2 to a low level when the output voltage of the rectifying circuit is increased from 90V to 140V;
and clamping the FB terminal voltage of the second switching constant-current tube IC2 to a high level when the output voltage of the rectifying circuit is increased to 180V.
Further, when the FB terminal voltage of the second switching constant-current tube IC2 is at a low level, the third resistor R3 clamps the CS terminal voltage of the second switching constant-current tube to a high level;
when the FB terminal voltage of the second switching constant current tube IC2 is at a high level, the third resistor R3 clamps the CS terminal voltage of the second switching constant current tube to a low level.
As a preferred embodiment of the present invention, based on the above, a voltage detection resistor is connected between the second steering diode D2 and the charge-discharge capacitor C1, and is grounded;
the voltage detection resistor comprises a first resistor R1 and a second resistor R2 which are connected in series;
the FB end of the first switching constant current tube IC1 is connected between the 1 st resistor R1 and the second resistor R2.
And when the voltage between the second steering diode D2 and the charge-discharge capacitor C1 is 240V, the voltage detection resistor clamps the FB terminal voltage of the first switching constant current tube IC1 to a high level. In the process of increasing the output voltage of the rectifying circuit from 240V to 300V, as shown in fig. 5, the FB terminal of the first switching constant-current tube IC1 is at a high level, at this time, the CS terminal voltage of the first switching constant-current tube is 0, and the CS terminal voltage of the second switching constant-current tube is not 0, so that the first switching Guan Heng current tube IC1 is in an off state, and the second switching constant-current tube IC2 is in a constant-current on state. The charge-discharge capacitor C1 is completely in a discharge state, and the charge-discharge capacitor C1 discharges the load component through a loop formed by the D-S end of the IC2, the load component and the second guide diode D2. It should be noted that when the capacitor discharges to a voltage less than 240V, the CS terminal currents of IC1 and IC2 change, so that the states of the two switching constant current tubes change; meanwhile, it is preferable that the waveform in 250H in fig. 4 is divided into 400Hz as seen from the waveforms of the voltage and current across the LED load assembly in fig. 5 when the rectifying circuit output voltage increases to 270V.
An LED lamp comprises the linear full-voltage variable-frequency constant-current circuit, and the load assembly comprises at least one LED lamp.
The invention has the beneficial effects that:
the invention adopts two switching constant current tubes to control the capacitor to switch charge and discharge according to the change of alternating voltage, realizes the functions of automatic frequency conversion and constant current under the condition of 90-300V alternating current full voltage, and has low cost and easy popularization.
In the charge-discharge switching process of the charge-discharge capacitor, the load component is enabled to work in a switch linear constant current state, and the circuit efficiency and the input power factor are greatly improved.
Drawings
FIG. 1 is a schematic diagram of a linear full-voltage variable frequency constant current circuit of the present invention;
FIG. 2 is a waveform diagram of the input voltage of the present invention at 110V;
FIG. 3 is a waveform diagram of the input voltage of the present invention at 150V;
FIG. 4 is a waveform diagram of the input voltage of the present invention at 220V;
FIG. 5 is a waveform diagram of the input voltage of the present invention at 270V;
fig. 6 is a pin configuration diagram of the switching constant current tube of the present invention.
Detailed Description
The technical scheme of the present invention will be clearly and completely described below.
It should be noted that, as shown in fig. 6, the switching constant current tube is a common knowledge as a person skilled in the art of the present invention, and includes an S terminal, a D terminal, a CS terminal, and an FB terminal; the S end is grounded, and when the FB end is at a high level, the D-S end is in a cut-off (cut-off) state, and is turned on otherwise; when the CS terminal is at low level, the switching constant current tube is in a switching state (the state of the switching constant current tube is determined by the FB terminal), and otherwise, the switching constant current tube is in a constant current state.
A linear full-voltage variable-frequency constant-current circuit, as shown in figure 1, comprises:
the input end of the rectifying circuit is connected to the mains supply;
the load assembly comprises at least one load, and the output end of the load assembly is connected with the output end of the rectifying circuit;
the first switching constant-current tube IC1 and the second switching constant-current tube IC2 are symmetrically arranged;
the S end of the first switching constant current tube IC1 and the S end of the second switching constant current tube IC2 are respectively connected to the input end of the load component; the D end of the first open Guan Heng flow tube IC1 is connected to the output end of the rectifying circuit through a charge-discharge capacitor C1, and the D end of the second switch constant flow tube IC2 is connected to the output end of the rectifying circuit; the CS end of the first switching constant current tube IC1 and the CS end of the second switching constant current tube IC2 are connected with each other and grounded through a third resistor R3.
Further, an output end of the rectifying circuit is connected with an output voltage detection resistor and grounded;
the output voltage detection resistor comprises a fourth resistor R4 and a fifth resistor R5 which are connected in series;
the FB terminal of the second switching constant current tube IC2 is connected between the fourth resistor R4 and the fifth resistor R5.
Further, a first steering diode D1 is connected between the D end of the first open Guan Heng flow tube IC1 and the charge-discharge capacitor C1.
Further, one end of the load component is connected with a second guide diode D2;
the second steering diode D2 is connected between the charge-discharge capacitor C1 and the first steering diode D1.
Further, when the load component is a load, the input end of the load component is the positive end of the load, and the output end of the load component is the negative end of the load;
when the load assembly comprises a plurality of loads connected in series, the input end of the load assembly is the positive end of the first load, and the output end of the load assembly is the negative end of the last load.
Further, the output voltage detection resistor,
clamping the FB terminal voltage of the second switching constant-current tube IC2 to a low level when the output voltage of the rectifying circuit is increased from 90V to 140V; as shown in fig. 2, when the input voltage is 90-140VAC, the FB terminal voltage of the second switching constant current tube IC2 is smaller than the low level, and at this time, the CS terminal voltages of the first and second switching constant current tubes are both in the high level state, so that both switching constant current tubes IC1 and IC2 are in the on state. The output end voltage of the rectifying circuit is divided into two branches and flows into the load assembly to supply power for the load, one branch flows into the load assembly through the D-S end of the IC2, the other branch flows into the load assembly through the charge-discharge capacitor C1 and the IC1, and the charge-discharge capacitor is charged while supplying power for the load assembly; preferably, when the output voltage of the rectifying circuit is increased to 110V, as can be seen from the voltage and current waveforms at two ends of the LED load assembly in fig. 2, the mains supply with the frequency of 50Hz is rectified to be 100Hz, and the rectified voltage and current are filtered to be rectangular waves due to the charging of the charging capacitor.
And clamping the FB terminal voltage of the second switching constant-current tube IC2 to a high level when the output voltage of the rectifying circuit is increased to 180V. As shown in fig. 3, when the input voltage is 140-180VAC, the FB terminal voltage of the second switching constant current tube IC2 is between high and low levels, and at this time, the CS terminal voltages of the first and second switching constant current tubes are both between high and low levels, so that the switching constant current tubes IC1 and IC2 are in a constant current conduction state, that is, the charge and discharge capacitors are in a switching state of charge and discharge. The output end voltage of the rectifying circuit is divided into two branches and flows into the load assembly to supply power for the load, one branch flows into the load assembly through the D-S end of the IC2, and the other branch flows into the load assembly through the charge-discharge capacitor C1 and the IC1 to supply power for the load assembly and charge the charge-discharge capacitor; with the increase of the input voltage, under the current limiting effect of the voltage at the CS end, the charging current is continuously reduced, and after the charging current is reduced to a certain value, the charging and discharging capacitor C1 discharges the load assembly through a loop formed by the D-S end of the IC2, the load assembly and the second guide diode D2, so that the switching of charging/discharging is completed; preferably, as the rectifier circuit output voltage increases to 150V, the 100Hz waveform in fig. 2 is divided by 200Hz, as can be seen from the voltage and current waveforms across the LED load assembly in fig. 3.
During the process of increasing the output voltage of the rectifying circuit to 240V, as shown in fig. 4, when the input voltage is 180-240VAC, the FB terminal voltage of the second switching constant current tube IC2 is in a high level state, and at this time, the CS terminal voltages of the first and second switching constant current tubes are both between 0V and low level, so the switching constant current tubes IC1 and IC2 are still in a constant current conduction state, except that the charge-discharge capacitor is in a switching state of discharging and charging: the charge-discharge capacitor C1 discharges the load component through a loop formed by the D-S end of the IC2, the load component and the second guide diode D2; with the increase of the input voltage, under the current limiting effect of the voltage at the CS end, the discharge current is continuously reduced, and after the discharge current is reduced to a certain value, the rectification circuit charges the charge-discharge capacitor; meanwhile, it is preferable that the waveform in 200Hz in fig. 3 is divided into 250Hz as seen from the waveforms of the voltage and current across the LED load assembly in fig. 4 when the rectifying circuit output voltage increases to 220V.
Further, when the FB terminal voltage of the second switching constant-current tube IC2 is at a low level, the third resistor R3 clamps the CS terminal voltage of the second switching constant-current tube to a high level;
when the FB terminal voltage of the second switching constant current tube IC2 is at a high level, the third resistor R3 clamps the CS terminal voltage of the second switching constant current tube to a low level.
As a preferred embodiment of the present invention, based on the above, a voltage detection resistor is connected between the second steering diode D2 and the charge-discharge capacitor C1, and is grounded;
the voltage detection resistor comprises a first resistor R1 and a second resistor R2 which are connected in series;
the FB end of the first switching constant current tube IC1 is connected between the 1 st resistor R1 and the second resistor R2.
And when the voltage between the second steering diode D2 and the charge-discharge capacitor C1 is 240V, the voltage detection resistor clamps the FB terminal voltage of the first switching constant current tube IC1 to a high level. In the process of increasing the output voltage of the rectifying circuit from 240V to 300V, as shown in fig. 4, the FB terminal voltage of the first switching constant current tube IC1 is greater than the high level, at this time, the CS terminal voltage of the first switching constant current tube is 0, and the CS terminal voltage of the second switching constant current tube is not 0, so the first switching constant current tube IC1 is in an off state, the second switching constant current tube IC2 is in a constant current on state, and the charge-discharge capacitor C1 is completely in a discharge state: the load assembly is discharged through a loop formed by the D-S terminal of IC2, the load assembly, and the second steering diode D2. It should be noted that when the capacitor discharges to a voltage less than 240V, the CS terminal currents of IC1 and IC2 change, so that the states of the two switching constant current tubes change; meanwhile, it is preferable that the waveform of 250Hz in fig. 4 is divided into 400Hz as seen from the waveforms of the voltage and current across the LED load assembly in fig. 5 when the rectifying circuit output voltage increases to 270V.
An LED lamp comprises the linear full-voltage variable-frequency constant-current circuit, and the load assembly comprises at least one LED lamp.
It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.
Claims (8)
1. A linear full-voltage variable frequency constant current circuit, comprising:
the input end of the rectifying circuit is connected to the mains supply;
the load assembly comprises at least one load, and the output end of the load assembly is connected with the output end of the rectifying circuit;
the first switching constant-current tube IC1 and the second switching constant-current tube IC2 are symmetrically arranged;
the switching constant-current power supply is characterized in that an S end of the first switching constant-current tube IC1 and an S end of the second switching constant-current tube IC2 are respectively connected to an input end of a load assembly; the D end of the first open Guan Heng flow tube IC1 is connected to the output end of the rectifying circuit through a charge-discharge capacitor C1, and the D end of the second switch constant flow tube IC2 is connected to the output end of the rectifying circuit; the CS end of the first switching constant current tube IC1 and the CS end of the second switching constant current tube IC2 are connected with each other and grounded through a third resistor R3;
the output end of the rectifying circuit is connected with an output voltage detection resistor and grounded;
a first steering diode D1 is connected between the D end of the first open Guan Heng flow tube IC1 and the charge-discharge capacitor C1;
one end of the load component is connected with a second guide diode D2;
the second steering diode D2 is connected between the charge-discharge capacitor C1 and the first steering diode D1;
and a voltage detection resistor is connected and arranged between the second guide diode D2 and the charge-discharge capacitor C1 and is grounded.
2. The linear full-voltage variable-frequency constant-current circuit according to claim 1, wherein,
the output voltage detection resistor comprises a fourth resistor R4 and a fifth resistor R5 which are connected in series;
the FB terminal of the second switching constant current tube IC2 is connected between the fourth resistor R4 and the fifth resistor R5.
3. The linear full-voltage variable-frequency constant-current circuit according to claim 1, wherein,
the voltage detection resistor comprises a first resistor R1 and a second resistor R2 which are connected in series;
the FB end of the first switching constant current tube IC1 is connected between the 1 st resistor R1 and the second resistor R2.
4. The linear full-voltage variable-frequency constant-current circuit according to claim 1, wherein,
when the load component is a load, the input end of the load component is the positive end of the load, and the output end of the load component is the negative end of the load;
when the load assembly comprises a plurality of loads connected in series, the input end of the load assembly is the positive end of the first load, and the output end of the load assembly is the negative end of the last load.
5. The circuit of claim 2, wherein the output voltage sense resistor,
when the output voltage of the rectifying circuit is 140V, clamping the FB terminal voltage of the second switching constant-current tube IC2 to a low level;
and when the output voltage of the rectifying circuit is 180V, clamping the FB terminal voltage of the second switching constant-current tube IC2 to a high level.
6. A linear full-voltage variable frequency constant current circuit according to claim 3, wherein,
the voltage-detecting resistor is provided with a voltage-detecting resistor,
and when the voltage between the second steering diode D2 and the charge-discharge capacitor C1 is 240V, clamping the FB terminal voltage of the first switching constant-current tube IC1 to a high level.
7. A linear full-voltage variable-frequency constant-current circuit according to claim 5 or 6, wherein,
when the FB terminal voltage of the second switching constant-current tube IC2 is at a low level, the third resistor R3 clamps the CS terminal voltage of the second switching constant-current tube to a high level;
when the FB terminal voltage of the second switching constant current tube IC2 is at a high level, the third resistor R3 clamps the CS terminal voltage of the second switching constant current tube to a low level.
8. An LED lamp comprising a linear full voltage variable frequency constant current circuit as claimed in any one of claims 1 to 7, wherein the load assembly comprises at least one LED lamp.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711265867.XA CN107820348B (en) | 2017-12-05 | 2017-12-05 | Linear full-voltage variable-frequency constant-current circuit and LED lamp with same |
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| CN201711265867.XA CN107820348B (en) | 2017-12-05 | 2017-12-05 | Linear full-voltage variable-frequency constant-current circuit and LED lamp with same |
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| CN109309992A (en) * | 2018-10-26 | 2019-02-05 | 苏州菲达旭微电子有限公司 | A kind of ripple-free LED circuit of half pressure power supply |
| CN111385937B (en) * | 2019-11-20 | 2021-11-30 | 宁波凯耀电器制造有限公司 | Miniaturized intelligent lamp |
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| CN102917516B (en) * | 2012-11-14 | 2015-04-29 | 深圳市华星光电技术有限公司 | Method for resolving excess temperature of constant current driving chips and light-emitting diode (LED) lamp bar driving circuit |
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| CN104093252A (en) * | 2014-07-16 | 2014-10-08 | 浙江大学 | Non-strobe non-isolated LED constant-current driving circuit |
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Address after: 215600 4 building, H building, Zhangjiagang economic and Technological Development Zone, Jiangsu. Applicant after: SUZHOU FEIDAXU MICRO-ELECTRONICS Co.,Ltd. Address before: 215000 No. 2 Pei Yuan Road, hi tech Zone, Suzhou, Jiangsu Applicant before: SUZHOU FEIDAXU MICRO-ELECTRONICS Co.,Ltd. |
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