CN111343747A - Circuit for enhancing load capacity of 0-10V dimming signal and implementation method - Google Patents
Circuit for enhancing load capacity of 0-10V dimming signal and implementation method Download PDFInfo
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Abstract
The invention discloses a circuit for enhancing the loading capacity of a 0-10V dimming signal, which comprises a voltage emitting following circuit, wherein the positive phase input end of the voltage emitting following circuit is connected with a 0-10V voltage input signal, the output end of the voltage emitting following circuit is connected with the input end of a push-pull output circuit, and the output end of the push-pull output circuit is respectively connected with a port P1, the negative phase input end of the voltage emitting following circuit and an N-channel MOS switch control circuit; the invention also discloses a realization method of the circuit for enhancing the load capacity of the 0-10V dimming signal. The invention effectively improves the loaded capacity of 0-10V signal output and realizes the application of centralized dimming control; according to the invention, the N-channel MOS tube Q3 is adopted to control the underground pull, the underground pull capability of dimming of 0-10V is realized, and when the MCU actively judges that 0-10V outputs low-end dead zone voltage (junction voltage of PNP triode Q2), the conduction of the N-channel MOS tube Q3 is controlled to realize effective 0V output of dimming signals to the ground.
Description
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to a circuit for enhancing the on-load capacity of a 0-10V dimming signal and an implementation method thereof.
Background
In the field of modern electronic technology, along with popularization of intelligent lighting application, application of the existing LED dimming control technology is also highlighted.
In the LED industrial and mining lamp and various professional lighting lamps for industrial lighting at present, dimming driving power supplies of the LED industrial and mining lamp and various professional lighting lamps support 0-10V signal dimming control, most of the existing 0-10V dimming controllers adopt an operational amplifier to output 0-10V dimming signals along with the dimming control, the dimming control of a single lamp can be met, but the driving current output along with the operational amplifier is small, and in the application occasion of carrying out centralized dimming on a plurality of LED dimming power supplies, due to the fact that the output current capacity is limited, the normal 0-10V dimming signals cannot be output, and the dimming control failure phenomenon is caused.
Disclosure of Invention
The present invention is directed to a circuit for enhancing the loading capability of a 0-10V dimming signal, so as to solve the above-mentioned problems in the prior art. The circuit for enhancing the load capacity of the 0-10V dimming signal provided by the invention has the characteristics of effectively improving the load capacity of the 0-10V signal output and realizing the application of centralized dimming control.
The invention also aims to provide a realization method of the circuit for enhancing the loading capacity of the 0-10V dimming signal.
In order to achieve the purpose, the invention provides the following technical scheme: a circuit for enhancing the carrying capacity of a 0-10V dimming signal comprises a voltage emitting following circuit, wherein a positive phase input end of the voltage emitting following circuit is connected with a 0-10V voltage input signal, an output end of the voltage emitting following circuit is connected with an input end of a push-pull output circuit, and an output end of the push-pull output circuit is respectively connected with a port P1, an inverted phase input end of the voltage emitting following circuit and an N-channel MOS switch control circuit.
Further, the voltage emitter follower circuit comprises an operational amplifier U1, wherein a pin 5 at a positive phase input end of the operational amplifier U1 is connected with a 0-10V voltage input signal, a pin 7 at an output end of the operational amplifier U1 is connected with an input end of a push-pull output circuit, a pin 6 at an inverse phase input end of the operational amplifier U1 is connected with an output end of the push-pull output circuit, a pin 8 at a power supply positive pole of the operational amplifier U1 is connected with a power supply 12V positive pole, and a pin 4 at a grounding end of the operational amplifier U1 is connected with a power supply grounding end.
Further, the push-pull output circuit comprises an NPN triode Q1, a base of the NPN triode Q1 is connected with the pin 7 of the output end of the operational amplifier U1, a collector of the NPN triode Q1 is connected with the positive electrode of the power supply 12V, and an emitter of the NPN triode Q1 is the output end of the push-pull output circuit.
In the invention, the push-pull output circuit further comprises a PNP triode Q2, the base of the PNP triode Q2 is connected with the pin 7 of the output terminal of the operational amplifier U1, the negative electrode of the PNP triode Q2 is connected with the ground terminal of the power supply, and the emitter of the PNP triode Q2 is the output terminal of the push-pull output circuit.
In the invention, the push-pull output circuit further comprises a resistor R1, one end of the resistor R1 is connected with the pin 7 of the output end of the operational amplifier U1, and the other end of the resistor R1 is the output end of the push-pull output circuit.
Further, the N-channel MOS switch control circuit includes an N-channel MOS transistor Q3, a drain of the N-channel MOS transistor Q3 is connected to the output terminal of the push-pull output circuit, and a source of the N-channel MOS transistor Q3 is connected to the power ground terminal.
In the invention, the N-channel MOS switch control circuit further includes a resistor R2, one end of the resistor R2 is connected to the gate of the N-channel MOS transistor Q3, and the other end of the resistor R2 is connected to an output control pin of the MCU.
In the present invention, the N-channel MOS switch control circuit further includes a resistor R3, one end of the resistor R3 is connected to the gate of the N-channel MOS transistor Q3, and the other end of the resistor R3 is connected to the power ground.
Further, the implementation method of the circuit for enhancing the on-load capability of the 0-10V dimming signal comprises the following steps:
the base electrode of an NPN triode Q1 is connected with the pin 7 of the output end of the operational amplifier U1, and the collector electrode of an NPN triode Q1 is connected with the positive electrode of a power supply 12V, so that output current driving is realized;
the base electrode of the PNP triode Q2 is connected with the pin 7 of the output end of the operational amplifier U1, and the negative electrode of the PNP triode Q2 is connected with the ground end of a power supply, so that the input source current driving is realized;
one end of the resistor R1 is connected with the pin 7 of the output end of the operational amplifier U1, so that the NPN triode Q1 and the PNP triode Q2 are ensured to work in an effective amplification area;
and the drain electrode of the N-channel MOS tube Q3 is connected with the output end of the push-pull output circuit, and the source electrode of the N-channel MOS tube Q3 is connected with the ground end of the power supply, so that the effective 0V ground output of the dimming signal is realized.
In the invention, the voltage emitter follower circuit comprises an operational amplifier U1, a pin 5 of a positive phase input end of the operational amplifier U1 is connected with a 0-10V voltage input signal, a pin 7 of an output end of the operational amplifier U1 is connected with an input end of a push-pull output circuit, a pin 6 of an inverting input end of the operational amplifier U1 is connected with an output end of the push-pull output circuit, a pin 8 of a positive power supply of the operational amplifier U1 is connected with a 12V positive electrode of a power supply, a pin 4 of a ground end of an operational amplifier U1 is connected with a ground end of the power supply, an emitter of an NPN triode Q1 is an output end of the push-pull output circuit, an emitter of a PNP triode Q2 is an output end of the push-pull output circuit, the other end of a resistor 387R 5 is an output end of the push-pull output circuit, the N-channel MOS switch control circuit further comprises a resistor R2, one end of a resistor R2 is connected, the other end of the resistor R2 is connected with an output control pin of the MCU, the N-channel MOS switch control circuit further comprises a resistor R3, one end of the resistor R3 is connected with the gate of the N-channel MOS transistor Q3, and the other end of the resistor R3 is connected with a power ground terminal.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention effectively improves the loaded capacity of 0-10V signal output and realizes the application of centralized dimming control;
2. according to the invention, the N-channel MOS tube Q3 is adopted to control the underground pull, the underground pull capability of dimming by 0-10V is realized, and when the MCU actively judges that 0-10V outputs low-end dead zone voltage (junction voltage of PNP triode Q2), the conduction of the N-channel MOS tube Q3 is controlled to realize effective 0V output of dimming signals to the ground;
3. the circuit of the invention is simple and ensures the stability and reliability of the work.
4. The invention realizes the cluster dimming control application of the dimmer for carrying out centralized dimming control on a plurality of lamps through the parallel connection of 0-10V dimming signals, and expands the application field of the 0-10V dimming signals in the centralized dimming of a large area.
Drawings
FIG. 1 is a schematic diagram of the circuit structure of the present invention;
FIG. 2 is a schematic diagram of a voltage follower circuit according to the present invention;
FIG. 3 is a schematic diagram of a push-pull output circuit according to the present invention;
FIG. 4 is a schematic diagram of an N-channel MOS switch control circuit according to the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1-4, the present invention provides the following technical solutions: a circuit for enhancing the on-load capacity of a 0-10V dimming signal comprises a voltage emitter follower circuit, and is characterized in that: the positive phase input end of the voltage emitter follower circuit is connected with a 0-10V voltage input signal, the output end of the voltage emitter follower circuit is connected with the input end of the push-pull output circuit, and the output end of the push-pull output circuit is respectively connected with a port P1, the inverted input end of the voltage emitter follower circuit and the N-channel MOS switch control circuit.
Furthermore, the voltage emitter follower circuit comprises an operational amplifier U1, a pin 5 at a positive phase input end of the operational amplifier U1 is connected with a 0-10V voltage input signal, a pin 7 at an output end of the operational amplifier U1 is connected with an input end of a push-pull output circuit, a pin 6 at an inverted phase input end of the operational amplifier U1 is connected with an output end of the push-pull output circuit, a pin 8 at a positive power supply electrode of the operational amplifier U1 is connected with a positive electrode of a power supply 12V, and a pin 4 at a grounding end of the operational amplifier U1 is connected with a grounding end of.
By adopting the technical scheme, the voltage following circuit mainly realizes the voltage following function of the 0-10V dimming signal.
Further, the push-pull output circuit comprises an NPN triode Q1, a PNP triode Q2 and a resistor R1, wherein a base of the NPN triode Q1, a base of the PNP triode Q2 and one end of the resistor R1 are all connected to the pin 7 of the output end of the operational amplifier U1, a collector of the NPN triode Q1 is connected to the positive electrode of the power supply 12V, a negative electrode of the PNP triode Q2 is connected to the ground terminal of the power supply, and an emitter of the NPN triode Q1, an emitter of the PNP triode Q2 and the other end of the resistor R1 are simultaneously connected to the pin 6 of the inverting input end of the operational amplifier U1, the drain of the N-channel MOS transistor Q3 and the pin 1 of the port P1.
By adopting the technical scheme, the push-pull output circuit mainly improves the load capacity of the output current band of 0-10V; an NPN triode Q1 realizes output current drive; the PNP triode Q2 realizes the input source current drive; resistor R1 ensures that NPN transistor Q1 and PNP transistor Q2 operate in an efficient amplification region.
Further, the N-channel MOS switch control circuit includes an N-channel MOS transistor Q3, a resistor R2, and a resistor R3, a drain of the N-channel MOS transistor Q3 is connected to an output terminal of the push-pull output circuit, a pin 6 of an inverting input terminal of the operational amplifier U1, and a pin 1 of the port P1, a source of the N-channel MOS transistor Q3 is connected to a power ground terminal, a gate of the N-channel MOS transistor Q3 is connected to one ends of the resistor R2 and the resistor R3, respectively, a power ground terminal of the other end of the resistor R3 is connected, and the other end of the resistor R2 is connected to an output control pin of the MCU.
By adopting the technical scheme, the N-channel MOS switch control circuit mainly realizes that the dimming signal can effectively output the dimming signal of 0V voltage, and avoids the situation that the dimming signal of 0V cannot be effectively output due to the junction voltage of the triode.
Further, the implementation method of the circuit for enhancing the loading capacity of the 0-10V dimming signal comprises the following steps:
the base electrode of an NPN triode Q1 is connected with the pin 7 of the output end of the operational amplifier U1, and the collector electrode of an NPN triode Q1 is connected with the positive electrode of a power supply 12V, so that output current driving is realized;
the base electrode of the PNP triode Q2 is connected with the pin 7 of the output end of the operational amplifier U1, and the negative electrode of the PNP triode Q2 is connected with the ground end of a power supply, so that the input source current driving is realized;
one end of the resistor R1 is connected with the pin 7 of the output end of the operational amplifier U1, so that the NPN triode Q1 and the PNP triode Q2 are ensured to work in an effective amplification area;
and the drain electrode of the N-channel MOS tube Q3 is connected with the output end of the push-pull output circuit, and the source electrode of the N-channel MOS tube Q3 is connected with the ground end of the power supply, so that the effective 0V ground output of the dimming signal is realized.
The resistor R1, the resistor R2 and the resistor R3 in this embodiment are all static bias resistors.
The dimming signal load current can also realize the adjustment of different load carrying capacities by replacing triodes (an NPN triode Q1 and a PNP triode Q2) with different powers in the push-pull output circuit, and the positive phase input of the voltage emitter follower circuit is a 0-10V signal generated after a preceding-stage MCU outputs a PWM wave and the PWM wave is subjected to multi-stage RC filtering and amplification, so that the amplitude MCU end which currently outputs the 0-10V voltage is a predictable value. When the voltage output by the push-pull output circuit is less than or equal to the junction voltage dead zone of the PNP triode Q2, the MCU outputs high level to control the conduction of the N-channel MOS transistor Q3 to pull the output to the ground to realize effective 0V output and ensure the normal output control of the dimming signal.
In conclusion, the load carrying capacity of 0-10V signal output is effectively improved, and the application of centralized dimming control is realized; according to the invention, the N-channel MOS tube Q3 is adopted to control the underground pull, the underground pull capability of dimming of 0-10V is realized, and when the MCU actively judges that 0-10V outputs low-end dead zone voltage (junction voltage of PNP triode Q2), the conduction of the N-channel MOS tube Q3 is controlled to realize effective 0V output of dimming signals to the ground.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A circuit for enhancing the on-load capacity of a 0-10V dimming signal comprises a voltage emitter follower circuit, and is characterized in that: the positive phase input end of the voltage emitter follower circuit is connected with a 0-10V voltage input signal, the output end of the voltage emitter follower circuit is connected with the input end of the push-pull output circuit, and the output end of the push-pull output circuit is respectively connected with a port P1, the inverted input end of the voltage emitter follower circuit and the N-channel MOS switch control circuit.
2. The circuit of claim 1, wherein the circuit for enhancing the on-load capability of the dimming signal of 0-10V comprises: the voltage emitting following circuit comprises an operational amplifier U1, wherein a pin 5 at a positive phase input end of an operational amplifier U1 is connected with a 0-10V voltage input signal, a pin 7 at an output end of an operational amplifier U1 is connected with an input end of a push-pull output circuit, a pin 6 at a negative phase input end of an operational amplifier U1 is connected with an output end of the push-pull output circuit, a pin 8 at a positive power supply end of the operational amplifier U1 is connected with a 12V positive pole of a power supply, and a pin 4 at a grounding end of an operational amplifier U1 is connected with a.
3. The circuit of claim 2, wherein the circuit for enhancing the on-load capability of the dimming signal of 0-10V comprises: the push-pull output circuit comprises an NPN triode Q1, the base electrode of the NPN triode Q1 is connected with the pin 7 of the output end of the operational amplifier U1, the collector electrode of the NPN triode Q1 is connected with the positive electrode of the power supply 12V, and the emitter electrode of the NPN triode Q1 is the output end of the push-pull output circuit.
4. The circuit of claim 3, wherein the circuit for enhancing the on-load capability of the dimming signal of 0-10V comprises: the push-pull output circuit further comprises a PNP triode Q2, the base of the PNP triode Q2 is connected with the pin 7 of the output end of the operational amplifier U1, the negative electrode of the PNP triode Q2 is connected with the ground end of a power supply, and the emitter of the PNP triode Q2 is the output end of the push-pull output circuit.
5. The circuit of claim 4, wherein the circuit for enhancing the on-load capability of the dimming signal of 0-10V comprises: the push-pull output circuit further comprises a resistor R1, one end of the resistor R1 is connected with the pin 7 of the output end of the operational amplifier U1, and the other end of the resistor R1 is the output end of the push-pull output circuit.
6. The circuit of claim 5, wherein the circuit for enhancing the on-load capability of the dimming signal of 0-10V comprises: the N-channel MOS switch control circuit comprises an N-channel MOS tube Q3, the drain electrode of the N-channel MOS tube Q3 is connected with the output end of the push-pull output circuit, and the source electrode of the N-channel MOS tube Q3 is connected with the ground end of a power supply.
7. The circuit of claim 6, wherein the circuit for enhancing the on-load capability of the dimming signal of 0-10V comprises: the N-channel MOS switch control circuit further comprises a resistor R2, one end of the resistor R2 is connected with the gate of the N-channel MOS transistor Q3, and the other end of the resistor R2 is connected with an output control pin of the MCU.
8. The circuit of claim 7, wherein the circuit for enhancing the on-load capability of the dimming signal of 0-10V comprises: the N-channel MOS switch control circuit further comprises a resistor R3, one end of the resistor R3 is connected with the gate of the N-channel MOS transistor Q3, and the other end of the resistor R3 is connected with the power supply grounding end.
9. The method for implementing the circuit for enhancing the on-load capability of the 0-10V dimming signal according to any one of claims 1-8, comprising the steps of:
the base electrode of an NPN triode Q1 is connected with the pin 7 of the output end of the operational amplifier U1, and the collector electrode of an NPN triode Q1 is connected with the positive electrode of a power supply 12V, so that output current driving is realized;
the base electrode of the PNP triode Q2 is connected with the pin 7 of the output end of the operational amplifier U1, and the negative electrode of the PNP triode Q2 is connected with the ground end of a power supply, so that the input source current driving is realized;
one end of the resistor R1 is connected with the pin 7 of the output end of the operational amplifier U1, so that the NPN triode Q1 and the PNP triode Q2 are ensured to work in an effective amplification area;
and the drain electrode of the N-channel MOS tube Q3 is connected with the output end of the push-pull output circuit, and the source electrode of the N-channel MOS tube Q3 is connected with the ground end of the power supply, so that the effective 0V ground output of the dimming signal is realized.
10. The method of claim 9, wherein the circuit for enhancing the on-load capability of the 0-10V dimming signal comprises: the voltage emitting following circuit comprises an operational amplifier U1, a positive phase input end 5 pin of the operational amplifier U1 is connected with a 0-10V voltage input signal, an output end 7 pin of the operational amplifier U1 is connected with an input end of a push-pull output circuit, an inverse phase input end 6 pin of the operational amplifier U1 is connected with an output end of the push-pull output circuit, a power supply positive electrode 8 pin of the operational amplifier U1 is connected with a power supply 12V positive electrode, a grounding end 4 pin of the operational amplifier U1 is connected with a power supply grounding end, an emitter of an NPN triode Q1 is an output end of the push-pull output circuit, an emitter of a PNP triode Q2 is an output end of the push-pull output circuit, the other end of a resistor R1 is an output end of the push-pull output circuit, the N-channel MOS switch control circuit further comprises a resistor R2, one end of the resistor R2 is connected with a gate of the N-channel MOS tube Q3, the other end of the resistor R2 is connected with an output control pin of the MCU, the N-channel, the other end of the resistor R3 is connected to the power supply ground.
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| CN110708828A (en) * | 2019-10-21 | 2020-01-17 | 勤上光电股份有限公司 | Relay amplifier circuit of dimming control system |
| CN211744792U (en) * | 2020-04-29 | 2020-10-23 | 横店集团得邦照明股份有限公司 | Circuit for enhancing load capacity of 0-10V dimming signal |
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2020
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205178996U (en) * | 2015-12-16 | 2016-04-20 | 西安森派电子技术有限公司 | Audio signal amplifier circuit |
| US9681514B1 (en) * | 2016-10-27 | 2017-06-13 | Crestron Electronics, Inc. | Dimmer configured for providing sinking and sourcing current outputs |
| CN208836431U (en) * | 2018-06-23 | 2019-05-07 | 上海欧切斯实业有限公司 | A kind of isolation 1-10V dim signal converter |
| CN209803582U (en) * | 2019-07-12 | 2019-12-17 | 闻天地装饰科技有限公司 | Intelligent switch socket control system |
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