CN106067803B - Level conversion circuit of digital addressable lighting interface DALI - Google Patents
Level conversion circuit of digital addressable lighting interface DALI Download PDFInfo
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- CN106067803B CN106067803B CN201610531829.3A CN201610531829A CN106067803B CN 106067803 B CN106067803 B CN 106067803B CN 201610531829 A CN201610531829 A CN 201610531829A CN 106067803 B CN106067803 B CN 106067803B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
- H03K19/017536—Interface arrangements using opto-electronic devices
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses a level conversion circuit of a digital addressable lighting interface DALI, which comprises a sending module and a receiving module; the transmitting module comprises a first optocoupler, a first triode, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor and a first diode; the receiving module comprises a second optocoupler, a fifth resistor, a sixth resistor and a zener diode; the first port of the first optical coupler U5 is connected with a power supply voltage, the second port is connected with an input level through a third resistor, the third port is connected with the first end of the first resistor, and the fourth port is respectively connected with the anode of the first capacitor and the cathode of the first diode; the first port of the second optocoupler is connected with the first end of the fifth resistor, and the second port of the second optocoupler is connected with the cathode of the zener diode. The level conversion circuit provided by the invention can reduce the cost and improve the stability.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, relates to a level conversion circuit, and particularly relates to a level conversion circuit of a digital addressable lighting interface DALI.
Background
Most of the existing level conversion circuits are built by adding a plurality of triodes and optocouplers, so that more power consumption is generated, and the working characteristics of the triodes also have influence on the EMI.
In view of this, there is an urgent need to design a new level conversion circuit so as to overcome the above-mentioned drawbacks of the existing level conversion circuit.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the level conversion circuit of the digital addressable lighting interface DALI can reduce cost and improve stability.
In order to solve the technical problems, the invention adopts the following technical scheme:
a level conversion circuit of a digital addressable lighting interface DALI, the level conversion circuit comprising: the device comprises a sending module, a receiving module and a rectifying circuit;
the transmitting module includes: the first optocoupler U5, the first triode Q206, the first resistor R220, the second resistor R221, the third resistor R218, the fourth resistor R222, the first capacitor C11 and the first diode D13;
the receiving module includes: the second optocoupler U4, the fifth resistor R233, the sixth resistor R234 and the zener diode D17;
the rectifying circuit comprises a rectifying bridge;
the first port of the first optocoupler U5 is connected with a power supply voltage VCC_MCU, the second port is connected with an input level DALI_TX through a third resistor R218, the third port is connected with the first end of a first resistor R220, and the fourth port is respectively connected with the anode of a first capacitor C11 and the cathode of a first diode D13;
the second end of the first resistor R220 is respectively connected with the first end of the second resistor R221 and the base electrode of the first triode Q206, and the second end of the second resistor R221 is connected with the negative electrode of the first capacitor C11, the emitter electrode of the first triode Q206 and the positive electrode of the zener diode D17; the collector of the first triode Q206 is connected with the first end of the fourth resistor R222; the second section of the fourth resistor R222 is respectively connected with the anode of the first diode D13, the second end of the fifth resistor R233 and the third port of the rectifier bridge D9;
the first port of the second optocoupler U4 is connected with the first end of the fifth resistor R233, the second port is connected with the cathode of the zener diode D17, the third port is connected with the first end of the sixth resistor R234, and simultaneously connected with DALI_RX, and the fourth port is connected with VCC_MCU; the second port of the sixth resistor R234 is grounded; the level shift process includes: when the DALI_TX is at a low level, a transmitting module matched with a first optical coupler U5 is connected with a DALI bus to convert the output of the DALI bus into 0V, so that the requirement of DALI electrical standard on the low level of-4.5V to 4.5V is met; when DALI_TX is at a high level, a transmitting module matched with a first photo U5 is connected with a DALI bus, so that the output of the DALI bus is converted into 16.8V, the requirement of DALI electrical standard on high level 9.5V-22.5V is met, the power consumption current on the DALI bus is ensured not to exceed 250MA by a first resistor R220 and a first triode Q206, meanwhile, the parameter selection requirement DC gain of the first triode Q206 is more than 100db, and meanwhile, heat is dissipated for the first triode Q206 by a heat dissipation unit;
the receiving module triggers the DALI_RX low level when the bus is low level, triggers the DALI_RX high level when the bus is high level, and the voltage stabilizing diode D17 ensures that the second optocoupler U4 is not driven when the bus does not reach the minimum high level voltage required by the standard.
A level conversion circuit of a digital addressable lighting interface DALI, the level conversion circuit comprising: a transmitting module and a receiving module;
the transmitting module includes: the first optocoupler U5, the first triode Q206, the first resistor R220, the second resistor R221, the third resistor R218, the fourth resistor R222, the first capacitor C11 and the first diode D13;
the receiving module includes: the second optocoupler U4, the fifth resistor R233, the sixth resistor R234 and the zener diode D17;
the first port of the first optocoupler U5 is connected with a power supply voltage VCC_MCU, the second port is connected with an input level DALI_TX through a third resistor R218, the third port is connected with the first end of a first resistor R220, and the fourth port is respectively connected with the anode of a first capacitor C11 and the cathode of a first diode D13;
the second end of the first resistor R220 is respectively connected with the first end of the second resistor R221 and the base electrode of the first triode Q206, and the second end of the second resistor R221 is connected with the negative electrode of the first capacitor C11, the emitter electrode of the first triode Q206 and the positive electrode of the zener diode D17; the collector of the first triode Q206 is connected with the first end of the fourth resistor R222; the second section of the fourth resistor R222 is respectively connected with the anode of the first diode D13, the second end of the fifth resistor R233 and the third port of the rectifier bridge D9;
the first port of the second optocoupler U4 is connected with the first end of the fifth resistor R233, the second port is connected with the cathode of the zener diode D17, the third port is connected with the first end of the sixth resistor R234, and simultaneously connected with DALI_RX, and the fourth port is connected with VCC_MCU; the second port of the sixth resistor R234 is grounded.
As a preferred embodiment of the present invention, the level shift process includes: when the DALI_TX is at a low level, a transmitting module matched with the first photo U5 is connected to a DALI bus, so that the requirement of the DALI electrical standard on the low level is met; when DALI_TX is at a high level, a transmitting module matched with a first photo U5 is connected to a DALI bus, the requirement of DALI electrical standard on the high level is met, the first resistor R220 and the first triode Q206 ensure that the power consumption current on the DALI bus does not exceed 250MA, meanwhile, the parameter selection requirement DC gain of the first triode Q206 is larger than 100db, and meanwhile, heat is dissipated for the first triode Q206 through a heat dissipation unit;
the receiving module triggers the DALI_RX low level when the bus is low level, triggers the DALI_RX high level when the bus is high level, and the voltage stabilizing diode D17 ensures that the second optocoupler U4 is not driven when the bus does not reach the minimum high level voltage required by the standard.
As a preferable mode of the present invention, the level conversion circuit further includes a rectifier circuit including a rectifier bridge;
the collector of the first triode Q206 is connected to the third port of the rectifier bridge through a fourth resistor R222.
The invention has the beneficial effects that: the level conversion circuit of the digital addressable lighting interface DALI can reduce cost, improve stability, effectively reduce power consumption and reduce EMI.
The traditional circuit uses a plurality of triodes, and generates more power consumption; meanwhile, due to the characteristics of the optocoupler, the electric isolation function is achieved, mutual interference and fault spreading among devices are restrained, and the safety and reliability of the system are improved; and the service life of the circuit is longer.
Drawings
Fig. 1 is a circuit diagram of a level conversion circuit of the DALI of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 1, the present invention discloses a level conversion circuit of a digital addressable lighting interface DALI, the level conversion circuit comprising: a transmitting module 2, a receiving module 1 and a rectifying circuit.
The transmitting module 2 includes: the first optocoupler U5, the first triode Q206, the first resistor R220, the second resistor R221, the third resistor R218, the fourth resistor R222, the first capacitor C11 and the first diode D13. The receiving module 1 includes: the second optocoupler U4, the fifth resistor R233, the sixth resistor R234 and the zener diode D17. The rectifying circuit includes a rectifying bridge.
The first port of the first optocoupler U5 is connected to the power supply voltage vcc_mcu, the second port is connected to the input level dali_tx through the third resistor R218, the third port is connected to the first end of the first resistor R220, and the fourth port is respectively connected to the anode of the first capacitor C11 and the cathode of the first diode D13.
The second end of the first resistor R220 is respectively connected with the first end of the second resistor R221 and the base electrode of the first triode Q206, and the second end of the second resistor R221 is connected with the negative electrode of the first capacitor C11, the emitter electrode of the first triode Q206 and the positive electrode of the zener diode D17; the collector of the first triode Q206 is connected with the first end of the fourth resistor R222; the second section of the fourth resistor R222 is connected to the anode of the first diode D13, the second end of the fifth resistor R233, and the third port of the rectifier bridge D9, respectively.
The first port of the second optocoupler U4 is connected with the first end of the fifth resistor R233, the second port is connected with the cathode of the zener diode D17, the third port is connected with the first end of the sixth resistor R234, and simultaneously connected with DALI_RX, and the fourth port is connected with VCC_MCU; the second port of the sixth resistor R234 is grounded; the level shift process includes: when the DALI_TX is at a low level, a transmitting module matched with a first optical coupler U5 is connected with a DALI bus, so that the output of the DALI bus is converted into about 0V (such as 0V), and the requirements of DALI electrical standards on low level-4.5V to 4.5V (or other ranges) are met; when the DALI_TX is at a high level, a transmitting module matched with the first photo U5 is connected with the DALI bus, so that the output of the DALI bus is converted into about 16.8V (for example, 16.8V is close to the power supply voltage of 17V), the requirement of DALI electrical standards on high level 9.5V-22.5V (other ranges can be met), the first resistor R220 and the first triode Q206 ensure that the power consumption current on the DALI bus does not exceed 250MA, meanwhile, the parameter selection requirement DC gain of the first triode Q206 is larger than 100db, and meanwhile, heat is dissipated for the first triode Q206 through a heat dissipation unit.
The receiving module triggers the DALI_RX low level when the bus is low level, triggers the DALI_RX high level when the bus is high level, and the voltage stabilizing diode D17 ensures that the second optocoupler U4 is not driven when the bus does not reach the minimum high level voltage required by the standard.
Example two
A level conversion circuit of a digital addressable lighting interface DALI, the level conversion circuit comprising: a sending module and a receiving module.
The transmitting module includes: the first optocoupler U5, the first triode Q206, the first resistor R220, the second resistor R221, the third resistor R218, the fourth resistor R222, the first capacitor C11 and the first diode D13.
The receiving module includes: the second optocoupler U4, the fifth resistor R233, the sixth resistor R234 and the zener diode D17.
The first port of the first optocoupler U5 is connected to the power supply voltage vcc_mcu, the second port is connected to the input level dali_tx through the third resistor R218, the third port is connected to the first end of the first resistor R220, and the fourth port is respectively connected to the anode of the first capacitor C11 and the cathode of the first diode D13.
The second end of the first resistor R220 is respectively connected with the first end of the second resistor R221 and the base electrode of the first triode Q206, and the second end of the second resistor R221 is connected with the negative electrode of the first capacitor C11, the emitter electrode of the first triode Q206 and the positive electrode of the zener diode D17; the collector of the first triode Q206 is connected with the first end of the fourth resistor R222; the second section of the fourth resistor R222 is connected to the anode of the first diode D13, the second end of the fifth resistor R233, and the third port of the rectifier bridge D9, respectively.
The first port of the second optocoupler U4 is connected with the first end of the fifth resistor R233, the second port is connected with the cathode of the zener diode D17, the third port is connected with the first end of the sixth resistor R234, and simultaneously connected with DALI_RX, and the fourth port is connected with VCC_MCU; the second port of the sixth resistor R234 is grounded.
In summary, the level conversion circuit of the digital addressable lighting interface DALI provided by the invention can reduce cost, improve stability, effectively reduce power consumption and reduce EM I.
The traditional circuit uses a plurality of triodes, and generates more power consumption; meanwhile, due to the characteristics of the optocoupler, the electric isolation function is achieved, mutual interference and fault spreading among devices are restrained, and the safety and reliability of the system are improved; and the service life of the circuit is longer.
The description and applications of the present invention herein are illustrative and are not intended to limit the scope of the invention to the embodiments described above. Variations and modifications of the embodiments disclosed herein are possible, and alternatives and equivalents of the various components of the embodiments are known to those of ordinary skill in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other assemblies, materials, and components, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.
Claims (4)
1. A level conversion circuit of a digital addressable lighting interface DALI, the level conversion circuit comprising: the device comprises a sending module, a receiving module and a rectifying circuit;
the transmitting module includes: the first optocoupler U5, the first triode Q206, the first resistor R220, the second resistor R221, the third resistor R218, the fourth resistor R222, the first capacitor C11 and the first diode D13;
the receiving module includes: the second optocoupler U4, the fifth resistor R233, the sixth resistor R234 and the zener diode D17;
the rectifying circuit comprises a rectifying bridge;
the first port of the first optocoupler U5 is connected with a power supply voltage VCC_MCU, the second port is connected with an input level DALI_TX through a third resistor R218, the third port is connected with the first end of a first resistor R220, and the fourth port is respectively connected with the anode of a first capacitor C11 and the cathode of a first diode D13;
the second end of the first resistor R220 is respectively connected with the first end of the second resistor R221 and the base electrode of the first triode Q206, and the second end of the second resistor R221 is connected with the negative electrode of the first capacitor C11, the emitter electrode of the first triode Q206 and the positive electrode of the zener diode D17; the collector of the first triode Q206 is connected with the first end of the fourth resistor R222; the second section of the fourth resistor R222 is respectively connected with the anode of the first diode D13, the second end of the fifth resistor R233 and the third port of the rectifier bridge D9;
the first port of the second optocoupler U4 is connected with the first end of the fifth resistor R233, the second port is connected with the cathode of the zener diode D17, the third port is connected with the first end of the sixth resistor R234, and simultaneously connected with DALI_RX, and the fourth port is connected with VCC_MCU; the second port of the sixth resistor R234 is grounded; the level shift process includes: when the DALI_TX is at a low level, a transmitting module matched with a first optical coupler U5 is connected with a DALI bus to convert the output of the DALI bus into 0V, so that the requirement of DALI electrical standard on the low level of-4.5V to 4.5V is met; when DALI_TX is at a high level, a transmitting module matched with a first photo U5 is connected with a DALI bus, so that the output of the DALI bus is converted into 16.8V, the requirement of DALI electrical standard on high level 9.5V-22.5V is met, the power consumption current on the DALI bus is ensured not to exceed 250MA by a first resistor R220 and a first triode Q206, meanwhile, the parameter selection requirement DC gain of the first triode Q206 is more than 100db, and meanwhile, heat is dissipated for the first triode Q206 by a heat dissipation unit;
the receiving module triggers the DALI_RX low level when the bus is low level, triggers the DALI_RX high level when the bus is high level, and the voltage stabilizing diode D17 ensures that the second optocoupler U4 is not driven when the bus does not reach the minimum high level voltage required by the standard.
2. A level conversion circuit of a digital addressable lighting interface DALI, the level conversion circuit comprising: a transmitting module and a receiving module;
the transmitting module includes: the first optocoupler U5, the first triode Q206, the first resistor R220, the second resistor R221, the third resistor R218, the fourth resistor R222, the first capacitor C11 and the first diode D13;
the receiving module includes: the second optocoupler U4, the fifth resistor R233, the sixth resistor R234 and the zener diode D17;
the first port of the first optocoupler U5 is connected with a power supply voltage VCC_MCU, the second port is connected with an input level DALI_TX through a third resistor R218, the third port is connected with the first end of a first resistor R220, and the fourth port is respectively connected with the anode of a first capacitor C11 and the cathode of a first diode D13;
the second end of the first resistor R220 is respectively connected with the first end of the second resistor R221 and the base electrode of the first triode Q206, and the second end of the second resistor R221 is connected with the negative electrode of the first capacitor C11, the emitter electrode of the first triode Q206 and the positive electrode of the zener diode D17; the collector of the first triode Q206 is connected with the first end of the fourth resistor R222; the second section of the fourth resistor R222 is respectively connected with the anode of the first diode D13, the second end of the fifth resistor R233 and the third port of the rectifier bridge D9;
the first port of the second optocoupler U4 is connected with the first end of the fifth resistor R233, the second port is connected with the cathode of the zener diode D17, the third port is connected with the first end of the sixth resistor R234, and simultaneously connected with DALI_RX, and the fourth port is connected with VCC_MCU; the second port of the sixth resistor R234 is grounded.
3. The level shifting circuit of a digital addressable lighting interface DALI of claim 2, characterized in that:
the level shift process includes: when the DALI_TX is at a low level, a transmitting module matched with the first photo U5 is connected to a DALI bus, so that the requirement of the DALI electrical standard on the low level is met; when DALI_TX is at a high level, a transmitting module matched with a first photo U5 is connected to a DALI bus, the requirement of DALI electrical standard on the high level is met, the first resistor R220 and the first triode Q206 ensure that the power consumption current on the DALI bus does not exceed 250MA, meanwhile, the parameter selection requirement DC gain of the first triode Q206 is larger than 100db, and meanwhile, heat is dissipated for the first triode Q206 through a heat dissipation unit;
the receiving module triggers the DALI_RX low level when the bus is low level, triggers the DALI_RX high level when the bus is high level, and the voltage stabilizing diode D17 ensures that the second optocoupler U4 is not driven when the bus does not reach the minimum high level voltage required by the standard.
4. The level shifting circuit of a digital addressable lighting interface DALI of claim 2, characterized in that:
the level conversion circuit further comprises a rectifying circuit, and the rectifying circuit comprises a rectifying bridge;
the collector of the first triode Q206 is connected to the third port of the rectifier bridge through a fourth resistor R222.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610531829.3A CN106067803B (en) | 2016-07-07 | 2016-07-07 | Level conversion circuit of digital addressable lighting interface DALI |
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| CN201610531829.3A CN106067803B (en) | 2016-07-07 | 2016-07-07 | Level conversion circuit of digital addressable lighting interface DALI |
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| CN106067803B true CN106067803B (en) | 2023-09-08 |
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