CN110958741A - Analog port multi-power switchable circuit, LED drive circuit and LED lamp - Google Patents
Analog port multi-power switchable circuit, LED drive circuit and LED lamp Download PDFInfo
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- CN110958741A CN110958741A CN201911147608.6A CN201911147608A CN110958741A CN 110958741 A CN110958741 A CN 110958741A CN 201911147608 A CN201911147608 A CN 201911147608A CN 110958741 A CN110958741 A CN 110958741A
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Abstract
The invention provides a multi-power switchable circuit of an analog port, which comprises: the device comprises a knob switch or a key with at least two gears, a voltage division resistor network and a comparator U1; voltage dividing resistors R4.... Rn in the voltage dividing resistor network are respectively connected in series with different gears of the switch or the key and a positive input electrode of the comparator U1; the negative input pole of the comparator U1 is connected with the output pole of the comparator U1 and the PIN Pin with a Pin-DIM main control IC; when the knob switch or the key is switched to different gears, the divider resistors with different resistance values are merged into the circuit to change the input voltage of the positive input electrode of the comparator U1; the main control IC with Pin-DIM outputs different driving currents according to different input voltages of the PIN PINs so as to change the brightness of the load LED. The analog port multi-power switchable circuit is simple, reliable and practical.
Description
Technical Field
The invention relates to the field of illumination, in particular to an LED lamp.
Background
However, an additional electronic switch switching circuit is needed, and since the MOS transistor of the electronic switch is connected in series in the power loop, certain loss is generated, the failure rate is increased, and the power regulation is not beneficial to EMI.
Disclosure of Invention
The invention aims to provide an analog port multi-power switchable circuit which is simple, reliable and practical.
In order to solve the above technical problem, the present invention provides an analog port multi-power switchable circuit, including: the device comprises a knob switch or a key with at least two gears, a voltage division resistor network and a comparator U1; voltage dividing resistors R4.... Rn in the voltage dividing resistor network are respectively connected in series with different gears of the switch or the key and a positive input electrode of the comparator U1; the negative input pole of the comparator U1 is connected with the output pole of the comparator U1 and the PIN Pin with a Pin-DIM main control IC;
when the knob switch or the key is switched to different gears, the divider resistors with different resistance values are merged into the circuit to change the input voltage of the positive input electrode of the comparator U1; the main control IC with Pin-DIM outputs different driving currents according to different input voltages of the PIN PINs so as to change the brightness of the load LED.
In a preferred embodiment: also included are resistors R1, R3 and R7 connected in series between the input voltage VCC and the positive input of a comparator U1.
In a preferred embodiment: one end of the knob switch or the key, which is far away from the voltage-dividing resistor network, is connected to the homonymous ends of the resistors R3 and R7.
In a preferred embodiment: the same-name ends of the resistors R1 and R3 are respectively connected to one ends of the capacitors C1 and C2 through the resistor R2; the other ends of the capacitors C1 and C2 are respectively connected to two ends of a resistor R7.
In a preferred embodiment: the same-name ends of the resistors R3 and R7 are also connected to one end, far away from the resistor R1, of the resistor R2 through the resistor R6 and the adjustable resistor RP which are connected in series.
In a preferred embodiment: one end of a divider resistor in the divider resistor network, which is far away from the knob switch or the key, is connected with one end of the resistor R2, which is far away from the resistor R1.
The invention also provides an LED driving circuit, which uses the analog port multi-power switchable circuit.
The invention also provides an LED lamp which uses the LED driving circuit.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the PWM duty ratio is changed by changing the voltage of the voltage dividing resistor network and performing analog-to-digital conversion through the comparator. The circuit can realize accurate multi-power switching and fine power adjustment only by presetting the resistance values of the divider resistors in the divider resistor network. Because the divider resistance network is set on the low-voltage loop, the utility model has simple and reliable practicability.
Drawings
FIG. 1 is a circuit diagram of an analog port multi-power switchable circuit in a preferred embodiment of the present invention;
fig. 2 is a graph of a simulated dimming curve for an LED lamp in a preferred embodiment of the invention.
Detailed Description
The technical solution of the present invention is further explained with reference to the accompanying drawings and the detailed description.
Referring to fig. 1, an analog port multi-power switchable circuit includes: the device comprises a knob switch or a key SW with three gears, a voltage dividing resistor network and a comparator U1; voltage dividing resistors R4 and R5 in the voltage dividing resistor network are respectively connected in series with different gears of a switch or a key SW and a positive input electrode of a comparator U1; the negative input pole of the comparator U1 is connected with the output pole of the comparator U1 and the PIN Pin with a Pin-DIM main control IC;
when the knob switch or the key SW is switched to different gears, the divider resistors with different resistance values are merged into the circuit to change the input voltage of the positive input electrode of the comparator U1; the main control IC with Pin-DIM outputs different driving currents according to different input voltages of the PIN PINs so as to change the brightness of the load LED.
In this embodiment, three dimming levels, namely, a full power level, a 50% power level, and a 30% power level, are used, and correspond to the suspension of the switch, the connection of the switch SW to the voltage dividing resistor network by R4, and the connection of the switch SW to the voltage dividing resistor network by R5, respectively; if more gear adjustments are to be made, more switches and a corresponding number of resistors are selected.
In this embodiment, the analog port multi-power switchable circuit further includes an input voltage VCC and resistors R1, R3 and R7 connected in series to the positive input terminal of the comparator U1. One end of the knob switch or the key SW, which is far away from the voltage dividing resistor network, is connected to the homonymous ends of the resistors R3 and R7. The same-name ends of the resistors R1 and R3 are respectively connected to one ends of the capacitors C1 and C2 through the resistor R2; the other ends of the capacitors C1 and C2 are respectively connected to two ends of a resistor R7. The same-name ends of the resistors R3 and R7 are also connected to one end, far away from the resistor R1, of the resistor R2 through the resistor R6 and the adjustable resistor RP which are connected in series. One end of a divider resistor in the divider resistor network, which is far away from the knob switch or the key SW, is connected with one end of the resistor R2, which is far away from the resistor R1.
The circuit utilizes the switch SW to adjust and control the mode of connecting the resistors into the circuit under different gears. The circuit is accessed by using different resistors, then, the input voltage Vcc is divided to obtain voltage, the voltage is accessed to the Pin-DIM of the main control IC through the comparator U1, different voltage signal gears are input to enable the main control IC to enter a full power or dimming mode, the output current and the output power of a main circuit are changed by using a dimming curve, so that the power of the whole machine is changed and adjusted, in addition, the voltage division and fine adjustment are carried out by using the adjustable resistor Rp and the circuit, and the further fine adjustment of the power of the whole machine under the power of 3 gears is realized.
The embodiment also provides an LED lamp, wherein the LED driving circuit uses the analog port multi-power switchable circuit.
The dimming curve of the LED lamp is shown in fig. 2.
1. Full power level (according to the dimming curve graph, the main control IC is in the maximum output current mode when the DIM input voltage signal is larger than 1.4V, and the whole machine is in the maximum output power state)
Firstly, a power supply module provides VCC voltage to a digital-to-analog conversion module, SW is shifted to a suspended gear, R2, R3, R6 and RP (adjusted to maximum resistance) are used for dividing voltage to obtain voltage larger than 1.4V, a second-order voltage-controlled active low-pass filter formed by R3, C1, R7, C2 and U1 is converted into a high-precision voltage signal which is strong in interference resistance and is supplied to PIN-DIM of a main control IC, and the main control IC outputs maximum current at the moment to realize the full-power state of output power.
2. The output is 50% power gear of full power (according to the light modulation curve graph, the main control IC is in 50% mode of maximum output current when the DIM input voltage signal is larger than 0.6V, and the whole machine is in 50% state of maximum output power at the time)
VCC voltage is provided by a power supply line module to an analog-to-digital conversion module, SW is switched to an R4 resistor gear, voltage division is carried out by utilizing R2, R3, R4, R6 and RP (adjusted to the maximum resistance value) to obtain voltage larger than 0.6V, a second-order voltage-controlled active low-pass filter formed by R3, C1, R7, C2 and U1 is converted into high-precision voltage signals with strong interference resistance to be supplied to PIN-DIM of the IC, and the main IC is controlled to output the maximum 50% current at the moment, so that the 50% power state of full power is output.
3. The output is 30% power gear of full power (according to the light modulation curve graph, the main control IC is in 30% mode of maximum output current under the condition that the DIM input voltage signal is more than 0.35V, and the whole machine is in 30% state of maximum output power at the time)
VCC voltage is provided by a power supply line module to an analog-to-digital conversion module, SW is switched to an R5 resistor gear, voltage division is carried out by utilizing R2, R3, R5, R6 and RP (adjusted to the maximum resistance value) to obtain voltage larger than 0.35V, a second-order voltage-controlled active low-pass filter formed by R3, C1, R7, C2 and U1 is converted into high-precision voltage signals with strong interference resistance to be supplied to PIN-DIM of the IC, and the main IC is controlled to output the maximum 30% current at the moment, so that the 30% power state of full power is output.
4. After the resistance value of the RP adjustable resistor is adjusted under the conditions of outputting full power, 50% power and 30% power, the voltage input to the PIN-DIM can be finely adjusted, and at the moment, the adjustment of more power gears can be realized.
5. Because the dimming curves of different main control ICs are different, the resistance values of the R4 and R5 resistors of the circuit can be correspondingly adjusted to be suitable for different IC schemes.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby. Equivalent changes and modifications made according to the patent scope and the specification of the present invention should be covered by the present invention.
Claims (8)
1. An analog port multi-power switchable circuit, comprising: the device comprises a knob switch or a key with at least two gears, a voltage division resistor network and a comparator U1; voltage dividing resistors R4.... Rn in the voltage dividing resistor network are respectively connected in series with different gears of the switch or the key and a positive input electrode of the comparator U1; the negative input pole of the comparator U1 is connected with the output pole of the comparator U1 and the PIN Pin with a Pin-DIM main control IC;
when the knob switch or the key is switched to different gears, the divider resistors with different resistance values are merged into the circuit to change the input voltage of the positive input electrode of the comparator U1; the main control IC with Pin-DIM outputs different driving currents according to different input voltages of the PIN PINs so as to change the brightness of the load LED.
2. The analog port multi-power switchable circuit of claim 1, wherein: also included are resistors R1, R3 and R7 connected in series between the input voltage VCC and the positive input of a comparator U1.
3. An analog port multi-power switchable circuit as claimed in claim 2, characterized in that: one end of the knob switch or the key, which is far away from the voltage-dividing resistor network, is connected to the homonymous ends of the resistors R3 and R7.
4. An analog port multi-power switchable circuit as claimed in claim 3, characterized in that: the same-name ends of the resistors R1 and R3 are respectively connected to one ends of the capacitors C1 and C2 through the resistor R2; the other ends of the capacitors C1 and C2 are respectively connected to two ends of a resistor R7.
5. An analog port multi-power switchable circuit as claimed in claim 4, characterized in that: the same-name ends of the resistors R3 and R7 are also connected to one end, far away from the resistor R1, of the resistor R2 through the resistor R6 and the adjustable resistor RP which are connected in series.
6. An analog port multi-power switchable circuit as claimed in claim 5, characterized in that: one end of a divider resistor in the divider resistor network, which is far away from the knob switch or the key, is connected with one end of the resistor R2, which is far away from the resistor R1.
7. An LED driver circuit, characterized in that an analog port multi-power switchable circuit according to any of claims 1-6 is used.
8. An LED lamp using the LED driving circuit according to claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911147608.6A CN110958741A (en) | 2019-11-21 | 2019-11-21 | Analog port multi-power switchable circuit, LED drive circuit and LED lamp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911147608.6A CN110958741A (en) | 2019-11-21 | 2019-11-21 | Analog port multi-power switchable circuit, LED drive circuit and LED lamp |
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| CN110958741A true CN110958741A (en) | 2020-04-03 |
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| CN201911147608.6A Pending CN110958741A (en) | 2019-11-21 | 2019-11-21 | Analog port multi-power switchable circuit, LED drive circuit and LED lamp |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2445318A1 (en) * | 2010-10-15 | 2012-04-25 | Thales Rail Signalling Solutions GmbH | LED signal lamp with constant current operation |
| CN202364459U (en) * | 2011-11-29 | 2012-08-01 | 苏州市纽克斯照明有限公司 | Light-modulating HID electronic ballast with standby function |
| CN104333934A (en) * | 2013-07-22 | 2015-02-04 | 四川新力光源股份有限公司 | LED illumination driving circuit |
| CN211240196U (en) * | 2019-11-21 | 2020-08-11 | 厦门阳光恩耐照明有限公司 | Analog port multi-power switchable circuit, LED drive circuit and LED lamp |
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2019
- 2019-11-21 CN CN201911147608.6A patent/CN110958741A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2445318A1 (en) * | 2010-10-15 | 2012-04-25 | Thales Rail Signalling Solutions GmbH | LED signal lamp with constant current operation |
| CN202364459U (en) * | 2011-11-29 | 2012-08-01 | 苏州市纽克斯照明有限公司 | Light-modulating HID electronic ballast with standby function |
| CN104333934A (en) * | 2013-07-22 | 2015-02-04 | 四川新力光源股份有限公司 | LED illumination driving circuit |
| CN211240196U (en) * | 2019-11-21 | 2020-08-11 | 厦门阳光恩耐照明有限公司 | Analog port multi-power switchable circuit, LED drive circuit and LED lamp |
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