CN107592702B - Power regulating circuit and LED lamp driving device - Google Patents
Power regulating circuit and LED lamp driving device Download PDFInfo
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- CN107592702B CN107592702B CN201710843225.7A CN201710843225A CN107592702B CN 107592702 B CN107592702 B CN 107592702B CN 201710843225 A CN201710843225 A CN 201710843225A CN 107592702 B CN107592702 B CN 107592702B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses a power regulating circuit and an LED lamp driving device, wherein the drain electrode of a switching tube unit is connected with the output end of a direct current constant voltage source, the source electrode of the switching tube unit is connected with the input end of a sampling unit, and the grid electrode of the switching tube unit is connected with the driving end of a regulating unit; the sampling input end of the adjusting unit is connected with the output end of the sampling unit and is used for comparing the sampling value of the sampling unit with a reference value, and then the duty ratio of the driving end is controlled according to the comparison result to control the on time of the switching tube unit so that the sampling value is the same as the reference value; the output end of the switch voltage regulating unit is connected with the input end of the regulating unit; when the on-off combination of the switch in the switch voltage regulating unit is changed, the output voltage of the output end of the switch voltage regulating unit is changed, and the corresponding reference value is also changed. The technical problems that the conventional LED lamp driving device cannot be produced uniformly to meet different power demands of clients, and power adjustment can only be realized in a production link but cannot be realized at a user side are solved.
Description
Technical Field
The invention relates to the field of LED lamps, in particular to a power regulating circuit and an LED lamp driving device.
Background
The basic structure of the light emitting diode (light emitting diode, LED) is an electroluminescent semiconductor material chip, and the LED lamp is a lamp which emits light by using the LED.
In real production, different customers have different power requirements for the LED lamp. Because the LED lamps are generally constant voltage, in the power regulating circuit of the existing LED lamp driving device, the requirements of working currents of different LED lamps in actual requirements are met by changing the resistance value of a single sampling resistor. Changing the resistance of a single sampling resistor is typically accomplished by replacing the sampling resistor or by using a variable resistor as the sampling resistor.
The resistance value of the sampling resistor is changed by changing the sampling resistor or adopting the variable resistor as the sampling resistor, and although the requirements of working currents of different LED lamps in actual requirements can be met, the LED driving device meeting different power requirements of clients can not be uniformly produced from the perspective of manufacturers, the adjustment of power can only be realized in a production link, the power of a product is determined once the product is finished, and the power adjustment can not be realized at a user side.
Disclosure of Invention
The invention discloses a power regulating circuit and an LED lamp driving device, which solve the technical problems that the conventional LED lamp driving device cannot be produced uniformly to meet different power demands of clients, and power regulation can only be realized in a production link but cannot be realized at a user side.
The invention provides a power regulating circuit, comprising: the device comprises a switching tube unit, a sampling unit, an adjusting unit and a switching voltage adjusting unit;
the drain electrode of the switching tube unit is connected with the output end of the direct current constant voltage source, the source electrode of the switching tube unit is connected with the input end of the sampling unit, and the grid electrode of the switching tube unit is connected with the driving end of the adjusting unit;
the sampling input end of the adjusting unit is connected with the output end of the sampling unit and is used for comparing the sampling value of the sampling unit with a reference value, and then the duty ratio of the driving end is controlled according to the comparison result to control the on time of the switching tube unit so that the sampling value is identical with the reference value;
the output end of the switch voltage regulating unit is connected with the input end of the regulating unit;
the switch voltage regulating unit comprises at least two equivalent resistors connected in parallel and a switch arranged on each equivalent resistor branch;
when the on-off combination of the switch in the switch voltage regulating unit is changed, the output voltage of the output end of the switch voltage regulating unit is changed, and the corresponding reference value is also changed.
Preferably, the method comprises the steps of,
the power regulating circuit further comprises an energy storage module connected to the branch of the sampling unit and used for guaranteeing that the sampling value is not suddenly changed through storing electric energy or releasing electric energy.
Preferably, the method comprises the steps of,
the equivalent resistor is formed by connecting at least two resistors in series, connecting at least two resistors in parallel or connecting at least three resistors in parallel.
Preferably, the method comprises the steps of,
the sampling unit is a current sampling unit, and the regulating unit is a current regulating unit;
the current sampling unit is used for converting a current signal flowing through the current sampling unit into a voltage signal so that the current regulating unit compares the voltage signal with a voltage reference value.
Preferably, the method comprises the steps of,
the current sampling unit is a resistor R50;
the switching tube unit is a MOS tube Q5.
Preferably, the method comprises the steps of,
the current regulating unit comprises a control chip U2, a resistor R38, a resistor R37, a capacitor C17 and a capacitor C18;
the first end of the resistor R38 is connected with the grid electrode of the MOS tube Q5;
the pin GATE of the control chip U2 is connected with the second end of the resistor R38 and is used for controlling the turn-off and turn-on of the MOS transistor Q5;
a capacitor C17 is connected between the VC pin and the GND pin of the control chip U2;
a capacitor C18 and a resistor R37 are also connected in series between the VC pin and the GND pin of the control chip U2 and are used for keeping the loop of the control chip U2 stable;
the SENSE pin of the control chip U2 is connected with the output end of the resistor R50 and is used for comparing the sampled voltage signal with a voltage reference value and then controlling the duty ratio of the output signal of the GATE pin according to the comparison result;
the VCC pin of the control chip U2 is connected with the power supply unit and is used for providing working voltage for the control chip U2;
the ACTL pin of the control chip U2 is connected with the output end of the switch voltage regulating unit.
Preferably, the method comprises the steps of,
the switch voltage regulating unit comprises a resistor R43, a resistor R39, a resistor R40, a resistor R41, a resistor R42, a resistor R44, a capacitor C19 and a dial switch SW;
the first end of the resistor R43 is connected with the positive electrode of an external direct-current voltage power supply, and the negative electrode of the external direct-current voltage power supply is connected with the GND pin of the control chip U2;
the second end of the resistor R43 is connected with the GND pin of the control chip U2 through a resistor R44;
the second end of the resistor R43 is connected with the GND pin of the control chip U2 through a capacitor C19;
the second end of the resistor R43 is connected with an ACTL pin of the control chip U2;
a resistor R39, a resistor R40, a resistor R41 and a resistor R42 are connected in parallel between the second end of the resistor R43 and the GND pin of the control chip U2;
the dial switch SW is respectively connected in series with each branch of the resistor R39, the resistor R40, the resistor R41 and the resistor R42, and is used for adjusting the voltage value on the ACTL pin of the control chip U2 by changing the on-off combination of the dial switch SW.
Preferably, the method comprises the steps of,
the power supply unit comprises a transformer winding N6, a diode D8, a voltage stabilizing tube ZD2, a resistor R36, a resistor R46 and a capacitor C16;
the first end of the transformer winding N6 is connected with the anode of the diode D8, and the second end is connected with the GND pin of the control chip U2;
the cathode of the diode D8 is connected with the first end of the resistor R46;
the second end of the resistor R46 is connected with the first end of the resistor R36 and the VCC pin of the control chip U2;
the second end of the resistor R36 is connected with the cathode of the voltage stabilizing tube ZD2 and is also connected with the anode of the external direct-current voltage power supply;
the anode of the voltage stabilizing tube ZD2 is connected with the GND pin of the control chip U2;
the positive pole of the capacitor C16 is connected with the VCC pin of the control chip U2, and the negative pole of the capacitor C16 is connected with the GND pin of the control chip U2.
The invention provides an LED lamp driving device, which comprises a rectifying module, a constant voltage module and any one of the power regulating circuits;
the input end of the rectifying module is connected with an alternating current power supply, and the output end of the rectifying module is connected with the input end of the constant voltage module;
the output end of the constant voltage module is a direct current constant voltage source output end.
Preferably, the method comprises the steps of,
the output end of the constant voltage module is connected with a first filtering unit in parallel and used for stabilizing output voltage.
From the above technical scheme, the invention has the following advantages:
the switch voltage regulating unit comprises at least two equivalent resistors connected in parallel and a switch arranged on each equivalent resistor branch; when the on-off combination of a switch in the switch voltage regulating unit is changed, the voltage output to the regulating unit by the switch voltage regulating unit is changed, and the corresponding reference value is also changed; the sampling input end of the adjusting unit is connected with the output end of the sampling unit, the sampling value of the sampling unit is compared with a reference value, and then the duty ratio of the driving end is controlled according to the comparison result to control the on time of the switching tube unit so that the sampling value is identical with the reference value; because each switch has two conditions of on-off, the number of on-off combinations of all the switches can reach the power of N of 2, N is the number of parallel equivalent resistors, and the corresponding reference value also has the power of N number of 2, so that the power of N number sampling values of 2 can be output.
Therefore, the power regulating circuit is applied to the LED lamp, the LED lamp is connected to the output end of the sampling unit, the number of parallel equivalent resistors can be determined according to the power requirement of a customer on the LED lamp, then the resistance value of each parallel equivalent resistor is calculated, and the LED lamp driving device capable of outputting various currents can be uniformly produced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic block diagram of an embodiment of a power conditioning circuit according to the present invention;
FIG. 2 is a schematic block diagram of another embodiment of a power conditioning circuit according to the present invention;
FIG. 3 is a schematic diagram of a specific circuit structure of an embodiment of a power conditioning circuit according to the present invention;
fig. 4 is a schematic block diagram of an embodiment of an LED lamp driving device according to the present invention;
fig. 5 is a schematic block diagram of another embodiment of an LED lamp driving device according to the present invention.
Detailed Description
The embodiment of the invention discloses a power regulating circuit and an LED lamp driving device, which solve the technical problems that the conventional LED lamp driving device cannot be produced uniformly to meet different power demands of clients, and power regulation can only be realized in a production link but cannot be realized at a user side.
Referring to fig. 1, a schematic block diagram of an embodiment of a power adjusting circuit according to the present invention is shown;
the present invention provides an embodiment of a power conditioning circuit, comprising: a switching tube unit 2, a sampling unit 3, a regulating unit 4 and a switching voltage regulating unit 5.
The drain electrode of the switching tube unit 2 is connected with the output end 1 of the direct current constant voltage source, the source electrode of the switching tube unit 2 is connected with the input end of the sampling unit 3, and the grid electrode of the switching tube unit 2 is connected with the driving end of the adjusting unit 4.
The sampling unit 3 may be a current sampling unit, and correspondingly, the adjusting unit 4 is a current adjusting unit; the sampling unit 3 may also be a voltage sampling unit, and correspondingly the regulating unit 4 is a voltage regulating unit.
The sampling input end of the adjusting unit 4 is connected with the output end of the sampling unit 3, and is used for comparing the sampling value of the sampling unit 3 with a reference value, and then controlling the duty ratio of the driving end according to the comparison result to control the on time of the switching tube unit 2 so that the sampling value is the same as the reference value.
If the sampling value is the same as the reference value, the duty ratio of the driving end does not need to be changed; if the sampling value is different from the reference value, the duty ratio of the driving end needs to be changed.
The output end of the switch voltage regulating unit 5 is connected with the input end of the regulating unit 4.
The switching regulator unit 5 comprises at least two equivalent resistors connected in parallel and a switch arranged on each equivalent resistor branch.
When the on-off combination of the switch in the switch voltage regulating unit 5 is changed, the output voltage of the output end of the switch voltage regulating unit 5 is changed, and the corresponding reference value is also changed.
Each output voltage at the output of the switching regulator unit 5 corresponds to a reference value.
Because each switch has two conditions of on-off, the number of on-off combinations of all the switches can reach the power of N of 2, N is the number of parallel equivalent resistors, and the corresponding reference value also has the power of N number of 2, so that the power of N number sampling values of 2 can be output.
Therefore, when the power regulating circuit is applied to the LED lamp and the LED lamp is connected to the output end of the sampling unit 3, the quantity of parallel equivalent resistors can be determined according to the power requirement of a customer on the LED lamp, then the resistance value of each parallel equivalent resistor is calculated, and the LED lamp driving device capable of outputting various currents can be uniformly produced.
For example, if a customer needs an LED lamp with five powers of 5W, 10W, 15W, 20W and 25W, three equivalent resistors in parallel and a switch arranged on each equivalent resistor branch need to be arranged, and the LED lamp can output 8 powers by controlling the on-off of the three switches, so that only the resistance values of the three equivalent resistors are calculated, so that the 8 powers include five powers of 5W, 10W, 15W, 20W and 25W.
Therefore, a manufacturer only needs to uniformly produce the power regulating circuits capable of outputting the five kinds of power, the requirements of different powers of clients can be met, and the power regulation can be realized at the client side only by arranging the switch on each equivalent resistance branch at the position which can be contacted by the user.
It should be noted that, the power adjusting circuit is provided with a plurality of resistors connected in parallel and a switch on each resistor branch, so that different on-off combinations of the switches can adjust the LED lamp to output different powers, which is an innovation point of the invention; in addition, in the invention, the idea of binary coding is applied to the on-off of the switch on each resistance branch.
Referring to fig. 2, a schematic block diagram of another embodiment of a power adjusting circuit according to the present invention is shown;
in another embodiment provided by the invention, the power regulating circuit can further comprise an energy storage module 7 connected to the branch of the sampling unit 3 for ensuring that the sampled value is not suddenly changed by storing or releasing electric energy.
Further, the equivalent resistor is formed by connecting at least two resistors in series, connecting at least two resistors in parallel or connecting at least three resistors in parallel.
Further, the sampling unit 3 is a current sampling unit, and the adjusting unit 4 is a current adjusting unit 4.
And a current sampling unit for converting the flowing current signal into a voltage signal so that the current adjusting unit 4 compares the voltage signal with a voltage reference value.
Referring to fig. 3, a specific circuit structure of an embodiment of a power adjusting circuit according to the present invention is shown.
As shown in fig. 3, the current sampling unit is a resistor R50, and the switching tube unit 2 is a MOS tube Q5.
As shown in fig. 3, the current adjusting unit 4 includes a control chip U2, a resistor R38, a resistor R37, a capacitor C17, and a capacitor C18.
The first end of the resistor R38 is connected with the grid electrode of the MOS tube Q5.
The pin GATE of the control chip U2 is connected to the second end of the resistor R38, and is used for controlling the turn-off and turn-on of the MOS transistor Q5.
A capacitor C17 is connected between the VC pin and the GND pin of the control chip U2.
And a capacitor C18 and a resistor R37 are also connected in series between the VC pin and the GND pin of the control chip U2 and are used for keeping the loop of the control chip U2 stable.
The SENSE pin of the control chip U2 is connected to the output terminal of the resistor R50, and is used to compare the sampled voltage signal with the voltage reference value, and then control the duty ratio of the GATE pin output signal according to the comparison result.
The VCC pin of the control chip U2 is connected to the power supply unit 7 for providing the control chip U2 with an operating voltage.
The ACTL pin of the control chip U2 is connected to the output of the switching regulator unit 5.
A diode D11 may also be connected between the GND pin of the control chip U2 and the gate of the switching tube unit 2, wherein the cathode of the diode D11 is connected to the gate of the switching tube unit 2.
As shown in fig. 3, the switching voltage regulating unit 5 includes a resistor R43, a resistor R39, a resistor R40, a resistor R41, a resistor R42, a resistor R44, a capacitor C19, and a dial switch SW.
The external dc voltage source may be a 0-10V dc voltage source.
The first end of the external direct-current voltage power supply resistor R43 is connected with the positive electrode of the external direct-current voltage power supply, and the negative electrode of the external direct-current voltage power supply is connected with the GND pin of the control chip U2.
The second end of the resistor R43 is connected with the GND pin of the control chip U2 through a resistor R44.
The second end of the resistor R43 is connected with the GND pin of the control chip U2 through a capacitor C19.
A second terminal of the resistor R43 is connected to the ACTL pin of the control chip U2.
A resistor R39, a resistor R40, a resistor R41 and a resistor R42 are connected in parallel between the second end of the resistor R43 and the GND pin of the control chip U2.
The dial switch SW is respectively connected in series with each branch of the resistor R39, the resistor R40, the resistor R41 and the resistor R42, and is used for adjusting the voltage value on the ACTL pin of the control chip U2 by changing the on-off combination of the dial switch SW.
In this embodiment, a diode D10 may be further connected in series between the first end of the resistor R43 and the positive electrode of the external dc voltage source, where the positive electrode of the external dc voltage source is connected to the cathode of the diode D10.
As shown in fig. 3, the power supply unit 6 includes a transformer winding N6, a diode D8, a regulator ZD2, a resistor R36, a resistor R46, and a capacitor C16.
The first end of the transformer winding N6 is connected with the anode of the diode D8, and the second end is connected with the GND pin of the control chip U2.
The cathode of the diode D8 is connected with the first end of the resistor R46.
The second end of the resistor R46 is connected with the first end of the resistor R36 and the VCC pin of the control chip U2.
The second end of the resistor R36 is connected with the cathode of the voltage stabilizing tube ZD2 and is also connected with the anode of an external direct-current voltage power supply.
Further, the second terminal of the resistor R36 may be connected to the anode of the diode D10 through the resistor.
The anode of the voltage stabilizing tube ZD2 is connected with the GND pin of the control chip U2.
The positive pole of the capacitor C16 is connected with the VCC pin of the control chip U2, and the negative pole of the capacitor C16 is connected with the GND pin of the control chip U2.
In the circuit of fig. 3, the energy storage module 7 is a transformer T2.
It should be noted that there are various power adjusting circuits provided in the present invention, and the circuit shown in fig. 3 is only one embodiment.
Referring to fig. 4, a schematic block diagram of an embodiment of an LED lamp driving device according to the present invention is shown;
the invention provides an embodiment of an LED lamp driving device, which comprises a rectifying module 10, a constant voltage module 11 and any one of the power regulating circuits.
The input end of the rectifying module 10 is connected with the alternating current power supply 9, the output end of the rectifying module is connected with the input end of the constant voltage module 11, and the output end of the constant voltage module 11 is the direct current constant voltage power supply output end 1.
The rectification module 10 rectifies the alternating current output by the alternating current power supply 9 into direct current, and then outputs constant voltage current after being regulated by the constant voltage module 11.
Referring to fig. 5, a schematic block diagram of another embodiment of an LED lamp driving device according to the present invention is shown;
in addition, in another embodiment of the present invention, the LED lamp driving device further includes a first filter unit connected in parallel to the output end of the constant voltage module 11, for stabilizing the output voltage.
In the power conditioning circuit shown in fig. 3, the first filter unit includes an electrolytic capacitor C15 and a resistor R35 connected in parallel, and the anode of the electrolytic capacitor C15 is grounded.
Further, a second filtering unit 8 may be further connected to the branch of the sampling unit 3, where the second filtering unit 8 includes an electrolytic capacitor C20 and a resistor R45 connected in parallel, and an anode of the electrolytic capacitor C20 is grounded.
When the LED lamp driving device provided by the invention is used, the LED lamp is connected with the second filtering unit 8 in parallel.
Further, the LED lamp driving device may further include a freewheeling diode D9, an anode of the freewheeling diode D9 is connected to a cathode of the LED lamp, and a cathode of the freewheeling diode D9 is connected to a source of the MOS transistor Q5.
Further, the LED lamp driving apparatus may further include a third filter unit 13, a fourth filter unit 14, and a fifth filter unit 15.
The third filter unit 13 is connected between the rectifying module 10 and the ac power supply 9, the fourth filter unit 14 is connected between the rectifying module 10 and the constant voltage module 11, and the fifth filter unit 15 is connected in series between the constant voltage module 11 and the power regulating circuit.
The first filtering unit, the second filtering unit 8, the third filtering unit 13, the fourth filtering unit 14 and the fifth filtering unit 15 all perform filtering, but the structures may be the same or different, and they are not described in detail here.
The above is a detailed description of the structure and connection manner of a power adjusting circuit and an LED lamp driving device, and for convenience of understanding, the following description will describe an application of the power adjusting circuit and the LED lamp driving device in a specific application scenario, where the application examples include:
according to the power demand of customers on the LED lamps, the number of parallel equivalent resistors in the switch voltage regulating unit 5 is determined, then the resistance value of each parallel equivalent resistor is calculated, and the power regulating circuit can be determined, so that the LED lamp driving device can be determined.
After the LED lamp driving device is determined, various on-off combinations of the switch can be constructed only by controlling the on-off of the switch on the equivalent resistor branch, so that the voltage output by the switch voltage regulating unit 5 to the regulating unit 4 is changed, the corresponding reference value is also changed, namely the current sampling value of the current sampling module is changed, and the LED lamp can output different powers because the current sampling value is the current value of the LED lamp.
The power adjusting circuit and the LED lamp driving device provided by the present invention are described in detail, and those skilled in the art will appreciate that the present invention is not limited to the above description, since the specific embodiments and the application range of the present invention can be changed according to the concepts of the embodiments of the present invention.
Claims (7)
1. A power conditioning circuit, comprising: the device comprises a switching tube unit, a sampling unit, an adjusting unit and a switching voltage adjusting unit;
the drain electrode of the switching tube unit is connected with the output end of the direct current constant voltage source, the source electrode of the switching tube unit is connected with the input end of the sampling unit, and the grid electrode of the switching tube unit is connected with the driving end of the adjusting unit;
the sampling input end of the adjusting unit is connected with the output end of the sampling unit and is used for comparing the sampling value of the sampling unit with a reference value, and then the duty ratio of the driving end is controlled according to the comparison result to control the on time of the switching tube unit so that the sampling value is identical with the reference value;
the output end of the switch voltage regulating unit is connected with the input end of the regulating unit;
the switch voltage regulating unit comprises at least two equivalent resistors connected in parallel and a switch arranged on each equivalent resistor branch;
when the on-off combination of the switch in the switch voltage regulating unit is changed, the output voltage of the output end of the switch voltage regulating unit is changed, and the corresponding reference value is also changed;
the sampling unit is a current sampling unit, and the regulating unit is a current regulating unit;
the current sampling unit is used for converting a flowing current signal into a voltage signal so that the current regulating unit compares the voltage signal with a voltage reference value;
the current sampling unit is a resistor R50;
the switching tube unit is a MOS tube Q5;
the current regulating unit comprises a control chip U2, a resistor R38, a resistor R37, a capacitor C17 and a capacitor C18;
the first end of the resistor R38 is connected with the grid electrode of the MOS tube Q5;
the pin GATE of the control chip U2 is connected with the second end of the resistor R38 and is used for controlling the turn-off and turn-on of the MOS transistor Q5;
a capacitor C17 is connected between the VC pin and the GND pin of the control chip U2;
a capacitor C18 and a resistor R37 are also connected in series between the VC pin and the GND pin of the control chip U2 and are used for keeping the loop of the control chip U2 stable;
the SENSE pin of the control chip U2 is connected with the output end of the resistor R50 and is used for comparing the sampled voltage signal with a voltage reference value and then controlling the duty ratio of the output signal of the GATE pin according to the comparison result;
the VCC pin of the control chip U2 is connected with the power supply unit and is used for providing working voltage for the control chip U2;
the ACTL pin of the control chip U2 is connected with the output end of the switch voltage regulating unit.
2. The power conditioning circuit of claim 1, further comprising an energy storage module coupled to the sampling unit branch for ensuring that the sampled value is not abrupt by storing or discharging electrical energy.
3. The power conditioning circuit of claim 1, wherein the equivalent resistance is formed by at least two resistors in series, at least two resistors in parallel, or at least three resistors in a mixture.
4. The power regulating circuit of claim 1, wherein the switching regulator unit comprises resistors R43, R39, R40, R41, R42, R44, C19, and a dial switch SW;
the first end of the resistor R43 is connected with the anode of an external direct-current voltage power supply, and the cathode of the external direct-current voltage power supply is connected with the GND pin of the control chip U2;
the second end of the resistor R43 is connected with the GND pin of the control chip U2 through a resistor R44;
the second end of the resistor R43 is connected with the GND pin of the control chip U2 through a capacitor C19;
the second end of the resistor R43 is connected with an ACTL pin of the control chip U2;
a resistor R39, a resistor R40, a resistor R41 and a resistor R42 are connected in parallel between the second end of the resistor R43 and the GND pin of the control chip U2;
the dial switch SW is respectively connected in series with each branch of the resistor R39, the resistor R40, the resistor R41 and the resistor R42, and is used for adjusting the voltage value on the ACTL pin of the control chip U2 by changing the on-off combination of the dial switch SW.
5. The power conditioning circuit of claim 4, wherein the power supply unit includes a transformer winding N6, a diode D8, a regulator ZD2, a resistor R36, a resistor R46, and a capacitor C16;
the first end of the transformer winding N6 is connected with the anode of the diode D8, and the second end is connected with the GND pin of the control chip U2;
the cathode of the diode D8 is connected with the first end of the resistor R46;
the second end of the resistor R46 is connected with the first end of the resistor R36 and the VCC pin of the control chip U2;
the second end of the resistor R36 is connected with the cathode of the voltage stabilizing tube ZD2 and is also connected with the anode of the external direct-current voltage power supply;
the anode of the voltage stabilizing tube ZD2 is connected with the GND pin of the control chip U2;
the positive pole of the capacitor C16 is connected with the VCC pin of the control chip U2, and the negative pole of the capacitor C16 is connected with the GND pin of the control chip U2.
6. An LED lamp driving device comprising a rectifying module, a constant voltage module, and the power adjusting circuit according to any one of claims 1 to 5;
the input end of the rectifying module is connected with an alternating current power supply, and the output end of the rectifying module is connected with the input end of the constant voltage module;
the output end of the constant voltage module is a direct current constant voltage source output end.
7. The LED lamp driving device according to claim 6, wherein the output end of the constant voltage module is connected in parallel with a first filter unit for stabilizing the output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710843225.7A CN107592702B (en) | 2017-09-18 | 2017-09-18 | Power regulating circuit and LED lamp driving device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710843225.7A CN107592702B (en) | 2017-09-18 | 2017-09-18 | Power regulating circuit and LED lamp driving device |
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| Publication Number | Publication Date |
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| CN107592702A CN107592702A (en) | 2018-01-16 |
| CN107592702B true CN107592702B (en) | 2024-04-09 |
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| CN201710843225.7A Active CN107592702B (en) | 2017-09-18 | 2017-09-18 | Power regulating circuit and LED lamp driving device |
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| CN110703832A (en) * | 2019-09-26 | 2020-01-17 | 深圳市博为光电股份有限公司 | Lamp and control method thereof |
| CN111741569A (en) * | 2020-08-13 | 2020-10-02 | 深圳市比尔达科技有限公司 | Circuit and method for constant power control of LED switching power supply |
| CN116133190A (en) * | 2022-12-29 | 2023-05-16 | 赛尔富电子有限公司 | Dimming power supply circuit and lamp |
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