CN217563824U - Dimming circuit, driving power supply and lamp - Google Patents
Dimming circuit, driving power supply and lamp Download PDFInfo
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- CN217563824U CN217563824U CN202221011605.7U CN202221011605U CN217563824U CN 217563824 U CN217563824 U CN 217563824U CN 202221011605 U CN202221011605 U CN 202221011605U CN 217563824 U CN217563824 U CN 217563824U
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Abstract
The utility model relates to a dimming circuit, drive power supply and lamps and lanterns, include: the dimming circuit comprises a dimming signal positive input end, a dimming signal negative input end, an isolation unit, a voltage input end, a first current limiting unit, a second current limiting unit, a switch unit and a dimming voltage output end; the first end of the isolation unit is connected with the positive input end of the dimming signal, the second end of the isolation unit is connected with the first end of the first current limiting unit and the first end of the switch unit, the second end of the first current limiting unit and the second end of the switch unit are connected with the voltage input end, the third end of the switch unit is connected with the first end of the second current limiting unit and the dimming voltage output end, and the negative input end of the dimming signal and the second end of the second current limiting unit are grounded. Implement the utility model discloses can realize turning off completely of lamps and lanterns with the low cost.
Description
Technical Field
The utility model relates to a technical field that adjusts luminance, more specifically say, relate to a dimming circuit, drive power supply and lamps and lanterns.
Background
When the 0-10V dimming panel lamp power supply is designed at present, when the voltage regulation is switched off to 0V in the actual design process, the real 0V cannot be achieved by the dimmer itself because the dimmer has an external input current, and the dimming chip cannot detect the 0V signal and can not be switched off, so that the switching off of the lamp cannot be realized. Therefore, there are two ways to implement the current market in the current market, one is to do not turn off at 0V, but only to do 1-10V adjustment, which limits the application scenario, and the other is to adopt a chip with a higher turn-off point, which greatly increases the circuit cost.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in providing a dimmer circuit, drive power supply and lamps and lanterns.
The utility model provides a technical scheme that its technical problem adopted is: constructing a dimming circuit comprising: the dimming circuit comprises a dimming signal positive input end, a dimming signal negative input end, an isolation unit, a voltage input end, a first current limiting unit, a second current limiting unit, a switch unit and a dimming voltage output end;
the first end of the isolation unit is connected with the positive input end of the dimming signal, the second end of the isolation unit is connected with the first end of the first current limiting unit and the first end of the switch unit, the second end of the first current limiting unit and the second end of the switch unit are connected with the voltage input end, the third end of the switch unit is connected with the first end of the second current limiting unit and the dimming voltage output end, and the negative input end of the dimming signal and the second end of the second current limiting unit are grounded.
Preferably, the utility model discloses an among the dimmer circuit, the switch unit includes a triode, the base of triode is connected the second end of isolation unit with the first end of first current-limiting unit, the projecting pole of triode is connected the first end of second current-limiting unit with the dimming voltage output, the collecting electrode of triode is connected voltage input end.
Preferably, in the dimming circuit of the present invention, the isolation unit includes a diode, a cathode of the diode is connected to the positive input end of the dimming signal, and an anode of the diode is connected to the first end of the first current limiting unit and the base of the triode.
Preferably, in the dimming circuit of the present invention, the first current limiting unit includes a first resistor, a first end of the first resistor is connected to the base of the triode, and a second end of the first resistor is connected to the voltage input terminal.
Preferably, in the dimming circuit of the present invention, the second current limiting unit includes a second resistor, a first end of the second resistor is connected to the emitter of the triode, and a second end of the second resistor is grounded.
Preferably, the utility model discloses an among the dimmer circuit, still include the voltage stabilizing unit, the first end of voltage stabilizing unit is connected the anodal input of dimming signal, the second end connection of voltage stabilizing unit the first end of isolation unit, the third end ground connection of voltage stabilizing unit.
Preferably, in the dimming circuit of the present invention, the voltage stabilizing unit includes a capacitor, a voltage regulator tube and a third resistor;
the first end of the third resistor is connected with the positive input end of the dimming signal, the second end of the third resistor is connected with the first end of the capacitor, the cathode of the voltage regulator tube and the first end of the isolation unit, and the second end of the capacitor and the anode of the voltage regulator tube are grounded.
The present application also features a drive power supply, comprising: the dimming circuit comprises a power conversion module and the dimming circuit as described in any one of the above, wherein the dimming voltage output end of the dimming circuit is connected with the power conversion module.
The present application further features a luminaire, comprising: a light emitting unit and a driving power supply as described above, the output of the driving power supply being connected to the light emitting unit.
Implement the utility model discloses a dimmer circuit, drive power supply and lamps and lanterns has following beneficial effect: complete turn-off of the lamp is achieved by a low cost circuit.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of an embodiment of a dimming circuit according to the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of a dimming circuit according to the present invention;
fig. 3 is a schematic circuit diagram of another embodiment of the dimming circuit of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, in a first embodiment of the present invention, a dimming circuit 100 includes: a dimming signal positive input terminal 111, a dimming signal negative input terminal 112, an isolation unit 120, a voltage input terminal 140, a first current limiting unit 151, a second current limiting unit 152, a switching unit 130, and a dimming voltage output terminal 160; the first end of the isolation unit 120 is connected to the dimming signal positive input end 111, the second end of the isolation unit 120 is connected to the first end of the first current limiting unit 151 and the first end of the switching unit 130, the second end of the first current limiting unit 151 and the second end of the switching unit 130 are connected to the voltage input end 140, the third end of the switching unit 130 is connected to the first end of the second current limiting unit 152 and the dimming voltage output end 160, and the dimming signal negative input end 112 and the second end of the second current limiting unit 152 are grounded. Specifically, the dimming signal positive input terminal 111 and the dimming signal negative input terminal 112 are used to connect the external dimming signal generating module 300 (shown in fig. 3), wherein the dimming signal negative input terminal 112 is grounded inside the dimming circuit 100. The dimming signal is connected to the first terminal of the isolation unit 120 through the positive input terminal 111 of the dimming signal to form a voltage at the first terminal of the isolation unit 120. Since the isolation unit 120 is in reverse isolation and forward conduction, the supply voltage of the voltage input terminal 140 forms a voltage identical to the input voltage of the first terminal of the isolation unit 120 at the second terminal of the isolation unit 120 through the first current limiting unit 151, that is, it can be understood that the voltage of the second terminal of the isolation unit 120 is identical to the voltage of the dimming signal and varies according to the voltage variation of the dimming signal. When the dimming signal is a varying voltage of 0-10V, the second terminal of the isolation unit 120 also generates a varying voltage of 0-10V. Meanwhile, the voltage at the second end of the isolation unit 120 drives the switch unit 130 to be turned on, wherein when the input voltages at the first ends of the switch unit 130 are different, the currents output from the third end of the switch unit 130 are also different, and the different currents form different voltages at the first end of the second current limiting unit 152, and finally can be driven to the driving power supply through the voltages to control the output of the supply voltage of the lamp of the driving power supply, so as to finally realize the dimming of the lamp. When the lamp needs to be turned off, the dimming signal is gradually reduced, the voltage of the second end of the isolation unit 120 is also gradually reduced at this time, the driving voltage input by the first end of the switching unit 130 is also gradually reduced at this time, when the voltage is reduced to a preset value, the switching unit 130 is turned off, at this time, no voltage is generated at the first end of the second current limiting unit 152, at this time, the driving power supply detects a voltage of 0V to turn off the output of the supply voltage of the lamp, and finally, the complete turning off of the lamp is realized.
Alternatively, as shown in fig. 2 and 3, the switching unit 130 includes a transistor Q1, a base of the transistor Q1 is connected to the second terminal of the isolation unit 120 and the first terminal of the first current limiting unit 151, an emitter of the transistor Q1 is connected to the first terminal of the second current limiting unit 152 and the dimming voltage output terminal 160, and a collector of the transistor Q1 is connected to the voltage input terminal 140. Specifically, in the switching unit 130, the base of the transistor Q1 is connected to the second end of the isolation unit 120, when the output voltage of the second end of the isolation unit 120 is greater than the cut-off voltage of the transistor Q1, the transistor Q1 is turned on, and meanwhile, the output current of the transistor Q1 increases along with the increase of the voltage of the second end of the isolation unit 120, and decreases along with the decrease of the voltage of the second end of the isolation unit 120. When the voltage of the second terminal of the isolation unit 120 decreases to be less than the cut-off voltage of the transistor Q1, the transistor Q1 is turned off, and the output current of the transistor Q1 is zero.
Optionally, the isolation unit 120 includes a diode D1, a cathode of the diode D1 is connected to the dimming signal positive input terminal 111, and an anode of the diode D1 is connected to the first terminal of the first current limiting unit 151 and the base of the transistor Q1. Specifically, the diode D1 is used for forward conduction and reverse isolation to generate the same voltage signal as the dimming signal at the anode of the diode D1.
Optionally, the first current limiting unit 151 includes a first resistor R1, a first end of the first resistor R1 is connected to the base of the transistor Q1, and a second end of the first resistor R1 is connected to the voltage input terminal 140. Specifically, the supply voltage through the voltage input terminal 140 forms a voltage at the first terminal of the resistor R1 to drive the transistor Q1 to turn on or off.
Optionally, the second current limiting unit 152 includes a second resistor R3, a first end of the second resistor R3 is connected to the emitter of the transistor Q1, and a second end of the second resistor R3 is grounded. Specifically, when the transistor Q1 is turned on, the input voltage of the voltage input terminal 140 forms a dimming voltage at the first terminal of the resistor R3.
Optionally, as shown in fig. 3, the dimming circuit 100 of the present invention further includes a voltage stabilizing unit, the first end of the voltage stabilizing unit is connected to the positive input end 111 of the dimming signal, the second end of the voltage stabilizing unit is connected to the first end of the isolating unit 120, and the third end of the voltage stabilizing unit is grounded. Specifically, the voltage stabilizing unit is connected to the first end of the isolation unit 120, and is configured to form a stable voltage at the second end of the isolation unit 120 when the isolation unit 120 is turned on in the forward direction. The voltage stabilizing unit can stabilize the voltage at a certain voltage, for example, 10V, when no dimming signal is input from the outside, so that a full signal is supplied to the dimming IC, and the IC can meet the output.
Optionally, the voltage stabilizing unit includes a capacitor C1, a voltage regulator ZD1, and a third resistor R2; the first end of the third resistor R2 is connected to the dimming signal positive input end 111, the second end of the third resistor R2 is connected to the first end of the capacitor C1, the cathode of the voltage regulator tube ZD1 and the first end of the isolation unit 120, and the second end of the capacitor C1 and the anode of the voltage regulator tube ZD1 are grounded. Specifically, in the voltage stabilizing unit, the first end of the isolation unit 120 is stabilized by the voltage stabilizing tube ZD1, so that the second end of the isolation unit 120 generates a stable voltage.
Additionally, the utility model discloses a driving power supply, include: a power conversion module 210, and a dimming circuit 100 as in any of the above, wherein the dimming voltage output 160 of the dimming circuit 100 is connected to the power conversion module 210. Specifically, in the driving power supply, the dimming voltage output end 160 of the dimming circuit 100 outputs the dimming voltage to control the output of the power conversion module 210, so as to output different power supply voltages for supplying power to the light emitting unit. When the dimming voltage is zero, the output of the power conversion module 210 is also zero, which is equivalent to turning off the power supply to the light emitting unit to turn off the light emitting unit.
Additionally, the utility model discloses a lamp, include: the light emitting unit 220 and the driving power supply as above, the output of which is connected to the light emitting unit. Specifically, in the lamp, the light emitting unit is powered by the above driving power supply to adjust the power supply voltage of the light emitting unit 220 or to turn off the power supply voltage of the light emitting unit 220.
It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (9)
1. A dimming circuit, comprising: the dimming circuit comprises a dimming signal positive input end, a dimming signal negative input end, an isolation unit, a voltage input end, a first current limiting unit, a second current limiting unit, a switch unit and a dimming voltage output end;
the first end of the isolation unit is connected with the positive input end of the dimming signal, the second end of the isolation unit is connected with the first end of the first current limiting unit and the first end of the switch unit, the second end of the first current limiting unit and the second end of the switch unit are connected with the voltage input end, the third end of the switch unit is connected with the first end of the second current limiting unit and the dimming voltage output end, and the negative input end of the dimming signal and the second end of the second current limiting unit are grounded.
2. The dimming circuit of claim 1, wherein the switching unit comprises a transistor, a base of the transistor is connected to the second terminal of the isolation unit and the first terminal of the first current limiting unit, an emitter of the transistor is connected to the first terminal of the second current limiting unit and the dimming voltage output terminal, and a collector of the transistor is connected to the voltage input terminal.
3. The dimming circuit of claim 2, wherein the isolation unit comprises a diode, a cathode of the diode is connected to the dimming signal positive input terminal, and an anode of the diode is connected to the first terminal of the first current limiting unit and the base of the triode.
4. The dimming circuit of claim 2,
the first current limiting unit comprises a first resistor, a first end of the first resistor is connected with the base electrode of the triode, and a second end of the first resistor is connected with the voltage input end.
5. The dimming circuit of claim 2,
the second current limiting unit comprises a second resistor, the first end of the second resistor is connected with the emitting electrode of the triode, and the second end of the second resistor is grounded.
6. The dimming circuit of claim 1, further comprising a voltage regulator unit, wherein a first terminal of the voltage regulator unit is connected to the positive input terminal of the dimming signal, a second terminal of the voltage regulator unit is connected to the first terminal of the isolation unit, and a third terminal of the voltage regulator unit is grounded.
7. The dimming circuit of claim 6, wherein the voltage regulator unit comprises a capacitor, a regulator tube and a third resistor;
the first end of the third resistor is connected with the positive input end of the dimming signal, the second end of the third resistor is connected with the first end of the capacitor, the cathode of the voltage regulator tube and the first end of the isolation unit, and the second end of the capacitor and the anode of the voltage regulator tube are grounded.
8. A drive power supply, comprising: a power conversion module, and the dimming circuit of any one of claims 1 to 7, wherein the dimming voltage output terminal of the dimming circuit is connected to the power conversion module.
9. A light fixture, comprising: a light emitting unit and a driving power supply according to claim 8, an output of the driving power supply being connected to the light emitting unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221011605.7U CN217563824U (en) | 2022-04-28 | 2022-04-28 | Dimming circuit, driving power supply and lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221011605.7U CN217563824U (en) | 2022-04-28 | 2022-04-28 | Dimming circuit, driving power supply and lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217563824U true CN217563824U (en) | 2022-10-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221011605.7U Active CN217563824U (en) | 2022-04-28 | 2022-04-28 | Dimming circuit, driving power supply and lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217563824U (en) |
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2022
- 2022-04-28 CN CN202221011605.7U patent/CN217563824U/en active Active
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