CN114567956A - Method and system for coping with light-load direct-current carrier signal distortion in direct-current lighting power supply - Google Patents
Method and system for coping with light-load direct-current carrier signal distortion in direct-current lighting power supply Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/175—Controlling the light source by remote control
- H05B47/185—Controlling the light source by remote control via power line carrier transmission
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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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 provides a method and a system for dealing with light-load direct current carrier signal distortion in direct current lighting power supply, wherein the method comprises the following steps: sending a DC carrier signal, detecting the actual fall time t of the DC output voltagef1(ii) a Will actually fall for a time tf1And a set fall time tfComparing; at tf1Greater than tfIn case of (3), putting a dummy load and retransmitting the direct current carrier signal; the actual fall time t of the DC output voltage is again detectedf1And with a set fall time tfMaking a comparison at tf1Is equal to tfIn the case of (2), disconnecting the dummy load; the system is used for executing the method. The invention can effectively solve the problem that the voltage drop time of the direct current carrier signal is influenced by the load under the condition of light load, and the direct current carrier signal can be controlled by the control module no matter what the actual lamp load isThe design waveform of the lamp is output, so that the dimming, the switching and other control of the lamp load can be effectively and accurately realized under any load condition.
Description
Technical Field
The invention relates to the technical field of illumination control, in particular to a method and a system for dealing with light-load direct-current carrier signal distortion in direct-current illumination power supply.
Background
In an existing direct current lighting power supply system, an AC-DC rectification module is generally adopted to convert alternating current into direct current, and then the direct current supplies power to a lamp load. The direct current voltage value output by the AC-DC rectification module is controlled by software and is continuously adjustable, and by utilizing the characteristic, when direct current is supplied, the direct current voltage value output by the AC-DC rectification module is continuously output according to a fixed amplitude difference under the control of the software, so that direct current carrier signals can be formed for communication, and the dimming, the switching and other control of the lamp load can be realized.
When the dc output voltage is used as a carrier for communication, it is affected by voltage amplitude difference, variation cycle, rise time and fall time. Fig. 1 is a typical waveform diagram of a set dc carrier signal, wherein the set dc carrier signal has key parameters including voltage amplitude difference (Δ V), variation period (Δ T), and rise time (T)r) And a fall time (t)f). When the direct current carrier signal is sent, the actual voltage amplitude difference, the change period and the rise time of the direct current carrier signal are completely controlled by software and are irrelevant to other factors, namely are consistent with a set value; but the actual fall time (t)f1) In addition to being controlled by software, it is also related to the discharge rate of the output capacitance of the AC-DC rectifier module. If the lamp load is too small, the discharge speed of the output capacitor of the AC-DC rectification module is insufficient, which causes the actual fall time (t)f1) Greater than a set fall time (t)f) The condition of (3) further causes distortion of the direct current carrier signal, which causes errors when the lamp load terminal analyzes the control command, and finally causes that the dimming, switching and other control of the lamp load cannot be realized.
Disclosure of Invention
In order to solve at least one of the above technical problems, the present invention provides a method and a system for dealing with light-load dc carrier signal distortion in dc lighting power supply, which can solve the problem of dc carrier signal waveform distortion under light load, and more reliably implement dimming, switching, and other controls on a lamp load.
The first aspect of the present invention provides a method for dealing with light-load dc carrier signal distortion in dc lighting power supply, including:
sending a DC carrier signal, detecting the actual fall time t of the DC output voltagef1；
Will actually fall for a time tf1And a set fall time tfComparing;
at tf1Greater than tfIn case of (3), putting a dummy load and retransmitting the direct current carrier signal;
the actual fall time t of the DC output voltage is again detectedf1And with a set fall time tfMaking a comparison at tf1Is equal to tfIn the case of (2), the dummy load is disconnected.
Preferably, the dummy load is arranged in parallel at the output of the dc lighting power supply system, i.e. it is arranged in parallel with the lamp load.
In any of the above embodiments, preferably, the dummy load has a resistance value according to
Obtaining the voltage value of the DC illumination power supply system, wherein C is an output equivalent capacitor of the DC illumination power supply system, the value of the output equivalent capacitor is a capacitance value formed by connecting output capacitors of a plurality of AC-DC rectification modules on the DC illumination power supply system in parallel, V is the output voltage of the DC illumination power supply system, namely the rated working output voltage value of the DC illumination power supply system, Delta V is the voltage amplitude difference of a set DC carrier signal, t is the voltage amplitude difference of the set DC carrier signalfIs the set falling time of the DC carrier signal.
In any of the above schemes, preferably, the resistance value of the dummy load is such that when the dc lighting power supply system is in idle state, the dummy load is put into the dc lighting power supply system alone, so that the actual falling time t can be obtainedf1And a set fall time tfEqual corresponding minimum load resistance values.
In any of the above embodiments, it is preferable that a delay (dead time) is provided to ensure that the output voltage of the dc lighting power supply system is stable when the dummy load is turned on and off.
In any of the above embodiments, the input and the output of the dummy load are controlled by controlling the on/off of a switch S, and the switch S is preferably provided in series with the dummy load.
Preferably, in any of the above schemes, the switch S is a dc contactor, and both the rated operating voltage and the rated operating current of the dc contactor are greater than the actual voltage and the current flowing through the dummy load, and a redundant design is adopted.
A second aspect of the present invention provides a system for dealing with light-load dc carrier signal distortion in dc lighting power supply, configured to perform a method for dealing with light-load dc carrier signal distortion in dc lighting power supply, where the system includes: the voltage detection module is connected with the control module and used for detecting the actual falling time t of the direct current output voltage when the direct current carrier signal is sentf1And sends it to the control module; the control module is used for judging the actual falling time t of the direct current output voltagef1Greater than the fall time t of the set DC carrier signalfAnd controlling to switch in the dummy load and resend the direct current carrier signal.
Preferably, the control module is further configured to determine an actual falling time t of the dc output voltage after retransmitting the dc carrier signalf1Equal to the set falling time t of the direct current carrier signalfAnd controlling to switch off the dummy load.
Preferably, in any of the above schemes, the dummy load is arranged in parallel at the output end of the dc lighting power supply system, that is, it is arranged in parallel with the lamp load.
In any of the above embodiments, preferably, the control module controls the dummy load to be switched on and off by controlling on/off of a switch S, and the switch S is connected in series with the dummy load.
Preferably, in any of the above schemes, the switch S is a dc contactor, and both the rated operating voltage and the rated operating current of the dc contactor are greater than the actual voltage and the current flowing through the dummy load, and a redundant design is adopted.
The method and the system for dealing with the distortion of the light-load direct-current carrier signal in the direct-current lighting power supply can effectively solve the problem that the voltage drop time of the direct-current carrier signal is influenced by the load under the condition of the light load by adding the dummy load at the output end of the direct-current lighting power supply system and controlling the input and the disconnection of the dummy load, the direct-current carrier signal can be output according to the design waveform of a control module no matter the size of the actual lamp load, the control failure of the lamp load caused by the waveform distortion of the direct-current carrier signal can not be caused, and therefore the dimming, the switching and other control of the lamp load can be effectively and accurately realized under any load condition.
Drawings
Fig. 1 is a diagram illustrating a waveform of a typical set dc carrier signal.
Fig. 2 is a schematic diagram showing a comparison between waveforms of an actually output dc carrier signal and a set dc carrier signal under the condition that a light load does not occur.
Fig. 3 is a schematic diagram showing a comparison between waveforms of a dc carrier signal actually output and a set dc carrier signal when a light load occurs.
Fig. 4 is a schematic flowchart of the operation of a preferred embodiment of the method for dealing with the distortion of the light-load dc carrier signal in the dc lighting power supply according to the present invention.
Fig. 5 is a schematic diagram of a preferred embodiment of a system for dealing with light-load dc carrier signal distortion in dc lighting power supply according to the present invention.
Fig. 6 is a schematic diagram of a preferred embodiment of a switch S of the system for dealing with light-load dc carrier signal distortion in dc lighting power supply according to the present invention.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the following examples.
Example 1
In the dc lighting power supply, the lamp load is usually dimmed by using the dc carrier communication methodAnd switches, and the like, particularly in the scene of needing to realize single lamp or regional control, and the direct current carrier communication has unique advantages. When sending DC carrier signal, its actual voltage amplitude difference, change period and rise time (t)r1) Is completely controlled by software, is irrelevant to other factors, namely is consistent with a set value; but the actual fall time (t)f1) In addition to being controlled by software, the discharge speed of the output capacitor of the AC-DC rectifier module is related to the magnitude of the lamp load participating in the output discharge loop of the AC-DC rectifier module.
If the lamp load is large enough, namely no light load condition occurs, the voltage drop time of an output discharge loop of an AC-DC rectification module of the direct current lighting power supply system formed by the lamp load is less than or equal to the set voltage drop time t of the direct current carrier signalfThe actual fall time t of the DC output voltage of the DC carrier signal transmitted at this timef1It is completely controlled by software, i.e. the transmitted dc carrier signal and the set dc carrier signal are kept identical, as shown in fig. 2.
However, in general, since the power of the lamp load is small, especially after the lamp is turned off in a remote standby mode, the lamp load is only the standby power consumption (less than 1W/pcs) of the lamp driving power supply, and at this time, a light load condition occurs. When light load occurs, the voltage drop time of an output discharge loop of an AC-DC rectification module of a direct current lighting power supply system formed by the participation of lamp loads is greater than the set voltage drop time t of a direct current carrier signalfThe actual fall time t of the DC output voltage of the DC carrier signal transmitted at this timef1Is influenced by the discharging speed of the discharging capacitor of the AC-DC rectifying module and is more than the set voltage drop time t of the direct current carrier signalfFurther, the transmitted dc carrier signal is not consistent with the set dc carrier signal, that is, the actually transmitted dc carrier signal is distorted, as shown in fig. 3.
Due to distortion of the actually transmitted direct current carrier signal, the lamp load end analyzes the direct current carrier signal incorrectly, and then actions such as dimming and switching cannot be executed correctly. For this reason, for the case that the dc carrier signal shown in fig. 3 is distorted, a method for dealing with the distortion of the light-load dc carrier signal in the dc lighting power supply is provided, the method includes:
sending a DC carrier signal, detecting the actual fall time t of the DC output voltagef1；
Will actually fall for a time tf1And a set fall time tfComparing;
at tf1Greater than tfIn case of (3), putting a dummy load and retransmitting the direct current carrier signal;
the actual fall time t of the DC output voltage is again detectedf1And with a set fall time tfMaking a comparison at tf1Is equal to tfIn the case of (2), the dummy load is switched off.
Specifically, as shown in fig. 4, the method for dealing with the distortion of the light-load dc carrier signal in the dc lighting power supply includes:
step S10: sending a DC carrier signal, detecting the actual fall time t of the DC output voltagef1(ii) a The direct current illumination power supply system is provided with an output voltage detection function, can read the output voltage in real time, records the initial time and the termination time of the voltage change when the direct current carrier signal is sent each time, and can obtain the actual reduction time t of the direct current output voltagef1。
Step S20: will actually fall for a time tf1And a set fall time tfComparing; if the actual falling time t is found through comparisonf1And a set fall time tfIf the direct current carrier signals are equal, the direct current carrier signals are considered to be normally sent; if the actual falling time t is found through comparisonf1Greater than a set fall time tfAnd considering that a light load condition occurs, and the direct current carrier signal is not normally transmitted.
Therefore, when t is found in step S30f1Greater than tfThen, step S40 is executed: and putting a dummy load and retransmitting the direct current carrier signal.
Discharge time of discharge capacitor of AC-DC rectification module has relationship：T=R1Cxln (V/. DELTA.V), wherein R1C is an equivalent capacitor output by the direct current lighting power supply system, V is output voltage of the direct current lighting power supply system, delta V is a voltage amplitude difference, V, C and delta V are fixed values, and therefore the discharge time T of the discharge capacitor and the equivalent resistor R of the system load1In a direct proportion relation; when the load is light, the equivalent resistance R of the system load1The value of (3) is larger, and the discharge time T of the discharge capacitor is increased in proportion.
A dummy load is arranged at the output end of the direct current lighting power supply system in parallel with the lamp load, and when the condition of light load is judged, the dummy load is put into use to reduce the equivalent resistance R of the system load1Further reducing the discharge time T of the discharge capacitor, wherein the discharge time T of the discharge capacitor is the actual falling time T of the DC output voltage of the DC carrier signalf1。
A resistance value of the dummy load is based on
Obtaining the voltage value of the DC illumination power supply system, wherein C is an output equivalent capacitor of the DC illumination power supply system, the value of the output equivalent capacitor is a capacitance value formed by connecting output capacitors of a plurality of AC-DC rectification modules on the DC illumination power supply system in parallel, V is the output voltage of the DC illumination power supply system, namely the rated working output voltage value of the DC illumination power supply system, Delta V is the voltage amplitude difference of a set DC carrier signal, t is the voltage amplitude difference of the set DC carrier signalfIs the set falling time of the DC carrier signal. In this embodiment, it is preferable that the dummy load has a resistance value such that when the dc lighting power supply system is idle, the dummy load is put into the dc lighting power supply system alone so that the actual falling time t is equal to or longer than the actual falling time tf1And a set fall time tfEqual corresponding minimum load resistance values.
Step S50: the actual fall time t of the DC output voltage is again detectedf1And with a set fall time tfA comparison is made.
In step S60, t is judgedf1Is equal to tfIf the direct current carrier signal is successfully transmitted normally, step S70 is executed: cutting off the dummy load; otherwise, executing step S80And (6) giving alarm information.
In steps S40 and S70, the input and output of the dummy load are controlled by controlling the on/off of a switch S provided in series with the dummy load. In this embodiment, it is preferable that the switch S is a dc contactor, and the rated operating voltage and the rated operating current of the dc contactor are both greater than the actual voltage and the current flowing through the dummy load, and a redundant design is adopted.
Since the dummy load is input in step S40, the dc lighting power supply system is in a light-load state; and the dummy load is small, and the actual falling time t can be ensured only by independently putting the dummy load into the DC lighting power supply system when the DC lighting power supply system is in no-load statef1And a set fall time tfAnd the corresponding minimum load resistance values are equal, so that the dummy load is switched in and out within the range of the load regulation rate of the direct-current lighting power supply system, and unstable power supply is avoided. Meanwhile, when the dummy load is put in and cut off, a delay (dead time) is set to further ensure the output voltage of the direct current lighting power supply system to be stable.
Example 2
As shown in fig. 5, a system for dealing with light-load dc carrier signal distortion in dc lighting power supply is used to execute a method for dealing with light-load dc carrier signal distortion in dc lighting power supply, and the system includes: the voltage detection module is connected with the control module and used for detecting the actual falling time t of the direct current output voltage when the direct current carrier signal is sentf1And sends it to the control module; the control module is used for judging the actual falling time t of the direct current output voltagef1Greater than the fall time t of the set DC carrier signalfAnd the control module is also used for retransmitting the direct current carrier signal and judging the actual falling time t of the direct current output voltagef1Equal to the set falling time t of the direct current carrier signalfAnd controlling to switch off the dummy load.
The dummy load is arranged at the output end of the direct current lighting power supply system in parallel, namely the dummy load is arranged in parallel with the lamp load. The control module controls the on-off of the dummy load by controlling the on-off of a switch S, and the switch S is connected with the dummy load in series. The switch S is a direct current contactor, the rated working voltage and the rated working current of the switch S are both larger than the actual voltage and the current flowing through the two ends of the dummy load, and a redundancy design is adopted.
As shown in fig. 6, the control module controls the on/off of a coil of the dc contactor, the coil is powered on, the dc contactor is closed, and the dummy load is put into operation; the solenoid is not electrified, the direct current contactor is disconnected, and the dummy load is disconnected.
In this embodiment, it is preferable that the voltage detection module and the control module are disposed in the dc power supply cabinet.
The control method has the advantages that the dummy load is added at the output end of the direct-current lighting power supply system, the input and the disconnection of the dummy load are controlled, the problem that the voltage drop time of the direct-current carrier signal is influenced by the load under the condition of light load can be effectively solved, no matter what the size of the actual lamp load is, the direct-current carrier signal can be output according to the design waveform of the control module, the control failure of the lamp load due to the waveform distortion of the direct-current carrier signal can be avoided, and therefore the dimming, the switching and other control of the lamp load can be effectively and accurately realized under any load condition.
Example 3
The method and the system for dealing with the distortion of the light-load direct current carrier signal in the direct current illumination power supply are suitable for a direct current illumination power supply system capable of realizing direct current carrier communication, in particular suitable for a direct current illumination power supply system needing remote control and a direct current illumination power supply system needing to control a single lamp or an area, such as a street lamp system, a factory illumination system, a large-area indoor illumination system, a landscape lamp illumination system, a tunnel illumination system and the like.
It should be noted that the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the foregoing embodiments illustrate the present invention in detail, those skilled in the art will appreciate that: it is possible to modify the technical solutions described in the foregoing embodiments or to substitute some or all of the technical features thereof, without departing from the scope of the technical solutions of the present invention.
Claims (10)
1. A method for dealing with light-load direct current carrier signal distortion in direct current lighting power supply comprises the following steps: transmitting a direct current carrier signal, characterized by: further comprising:
detecting the actual fall time t of the DC output voltagef1；
Will actually fall for a time tf1And a set fall time tfComparing;
at tf1Greater than tfIn case of (3), putting a dummy load and retransmitting the direct current carrier signal;
the actual fall time t of the DC output voltage is again detectedf1And with a set fall time tfMaking a comparison at tf1Is equal to tfIn the case of (2), the dummy load is disconnected.
2. The method for dealing with light-load direct current carrier signal distortion in direct current lighting power supply of claim 1, characterized in that: the dummy load is arranged at the output end of the direct current lighting power supply system in parallel, namely the dummy load is arranged in parallel with the lamp load.
3. The method for dealing with light-load direct current carrier signal distortion in direct current lighting power supply of claim 2, characterized in that: a resistance value of the dummy load is based on
Obtaining the voltage value of the DC illumination power supply system, wherein C is the output equivalent capacitance of the DC illumination power supply system, the value of the equivalent capacitance is the capacitance value after the output capacitances of a plurality of AC-DC rectification modules on the DC illumination power supply system are connected in parallel, V is the output voltage of the DC illumination power supply system, namely the rated working output voltage value of the DC illumination power supply system, and delta V isVoltage amplitude difference, t, of set DC carrier signalfIs the set falling time of the DC carrier signal.
4. A method for dealing with light-load dc carrier signal distortion in a dc lighting power supply as claimed in claim 3, wherein: the resistance value of the dummy load is that the actual falling time t can be ensured by independently putting the dummy load when the direct-current lighting power supply system is in no-loadf1And a set fall time tfEqual corresponding minimum load resistance values.
5. The method for dealing with light-load direct current carrier signal distortion in direct current lighting power supply of claim 1, characterized in that: when the dummy load is switched on and switched off, a time delay, namely dead time, is set so as to ensure that the output voltage of the direct current illumination power supply system is stable.
6. The method for dealing with light-load direct current carrier signal distortion in direct current lighting power supply of claim 1, characterized in that: and controlling the on-off of the dummy load by controlling the on-off of a switch S, wherein the switch S is connected with the dummy load in series.
7. The method for dealing with light-load direct current carrier signal distortion in direct current lighting power supply of claim 6, wherein: the switch S is a direct current contactor, the rated working voltage and the rated working current of the switch S are both larger than the actual voltage and the flowing current at two ends of the dummy load, and a redundancy design is adopted.
8. A system for dealing with light-load direct current carrier signal distortion in direct current lighting power supply is characterized in that: method for performing the handling of light-load dc carrier signal distortions in a dc lighting supply according to any of claims 1-7, the system comprising: the voltage detection module is connected with the control module and used for detecting direct current transmission when sending a direct current carrier signalActual falling time t of output voltagef1And sends it to the control module; the control module is used for judging the actual falling time t of the direct current output voltagef1Greater than the fall time t of the set DC carrier signalfAnd controlling to switch in the dummy load and resend the direct current carrier signal.
9. The system for handling distortion of a light-duty dc carrier signal in a dc lighting supply of claim 8, wherein: the control module is also used for retransmitting the direct current carrier signal and judging the actual falling time t of the direct current output voltagef1Equal to the set falling time t of the direct current carrier signalfAnd controlling to switch off the dummy load.
10. The system for handling light-load dc carrier signal distortion in dc lighting power supply of claim 9, wherein: the dummy load is arranged at the output end of the direct current lighting power supply system in parallel, namely the dummy load is arranged in parallel with the lamp load; the control module controls the on-off of the dummy load by controlling the on-off of a switch S, and the switch S is connected with the dummy load in series.
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