CN215818691U - Control circuit of relative phase and LED constant current system - Google Patents
Control circuit of relative phase and LED constant current system Download PDFInfo
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- CN215818691U CN215818691U CN202121975586.5U CN202121975586U CN215818691U CN 215818691 U CN215818691 U CN 215818691U CN 202121975586 U CN202121975586 U CN 202121975586U CN 215818691 U CN215818691 U CN 215818691U
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Abstract
The utility model discloses a relative phase control circuit and an LED constant current system, wherein the relative phase control circuit comprises an alternating current power supply unit, a front-stage constant current unit, a rear-stage constant current unit and a control signal output unit; the alternating current power supply unit is used for outputting alternating current voltage to the preceding stage constant current unit and supplying power to the control signal output unit; the preceding stage constant current unit is used for carrying out primary constant current processing on the alternating current voltage output by the alternating current power supply unit; the rear-stage constant current unit is used for carrying out secondary constant current processing on the current subjected to constant current processing by the front-stage constant current unit when the control signal output unit outputs the control signal; the control signal output unit comprises a preceding stage power supply unit, a control module power supply unit and a control module which are sequentially connected in series; and the alternating current power supply unit is also used for charging the preceding power supply unit. The utility model solves the problem that the input current waveform of the wire network in the LED constant current system can not meet the relative phase in the IEC61000-3-23 file, and improves the input current waveform of the wire network in the LED constant current system.
Description
Technical Field
The utility model relates to the technical field of LED constant current control, in particular to a relative phase control circuit and an LED constant current system.
Background
At present, under the background that energy conservation and emission reduction are emphasized in various countries in the world, the LED is gradually applied to the field of general illumination due to the environment protection, energy conservation, long service life, high brightness, safety, stability and the like. High power LED lighting devices have gained wide acceptance in various national markets and are increasingly presenting a trend towards replacement of traditional lighting.
An intelligent LED constant current system is a driving power supply of LED lighting equipment, and belongs to one of linear power supplies. The intelligent LED constant current system mainly comprises an alternating current power supply unit, a preceding stage constant current unit, a control signal output unit and a following stage constant current unit, and the problem that how to improve the input current waveform so as to meet the requirement of a relative phase is urgently needed to be overcome because the preceding stage power supply part in the control signal output unit causes that the input current waveform of a wire network cannot meet the requirement of the relative phase in the IEC61000-3-23 document.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a relative phase control circuit and an LED constant current system, and aims to solve the problem that the input current waveform of a wire network in the existing intelligent LED constant current system cannot meet the relative phase in an IEC61000-3-23 file, and improve the input current waveform of the wire network in the LED constant current system.
In order to achieve the purpose, the control circuit of the relative phase comprises an alternating current power supply unit, a front stage constant current unit, a rear stage constant current unit and a control signal output unit;
the output end of the alternating current power supply unit, the input end of the front stage constant current unit and the input end of the rear stage constant current unit are commonly connected, the controlled end of the rear stage constant current unit is connected with the control end of the control signal output unit, and the power end of the control signal output unit is connected with the alternating current power supply unit;
the alternating current power supply unit is used for outputting alternating current voltage to the preceding stage constant current unit and supplying power to the control signal output unit;
the preceding stage constant current unit is used for carrying out primary constant current processing on the alternating current voltage output by the alternating current power supply unit;
the rear-stage constant current unit is used for performing secondary constant current processing on the current subjected to the constant current processing by the front-stage constant current unit when the control signal output unit outputs a control signal;
the control signal output unit comprises a preceding stage power supply unit, a control module power supply unit and a control module which are sequentially connected in series, wherein the preceding stage power supply unit is connected with the preceding stage constant current unit;
the alternating current power supply unit is also used for charging the preceding stage power supply unit.
Optionally, the ac power supply unit includes an ac input source, a bridge rectifier circuit and a second diode,
one end of the alternating current input source is connected with one input end of the bridge rectifier circuit, the other end of the alternating current input source is connected with the other input end of the bridge rectifier circuit, the output end of the bridge rectifier circuit is connected with the anode of the second diode, and the cathode of the second diode is the output end of the alternating current power supply unit.
Optionally, the preceding-stage constant current unit includes a first comparator, a second polar capacitor, a first MOS transistor, and a second resistor;
the positive electrode of the second polar capacitor is the input end of the preceding stage constant current unit, the negative electrode of the second polar capacitor is connected with the drain electrode of the first MOS tube, the grid electrode of the first MOS tube is connected with the output end of the first comparator, the positive phase input end of the first comparator is a reference voltage end, the negative phase input end of the first comparator is connected with the source electrode of the first MOS tube and is connected with the first end of the second resistor, and the second end of the second resistor is grounded.
Optionally, the preceding-stage constant current unit includes a first comparator, a second polar capacitor, a first MOS transistor, a first zener diode, and a second resistor;
the positive electrode of the second polar capacitor is the input end of the preceding stage constant current unit, the negative electrode of the second polar capacitor is connected with the drain electrode of the first MOS tube, the grid electrode of the first MOS tube is connected with the output end of the first comparator, the positive phase input end of the first comparator is a reference voltage end, the negative phase input end of the first comparator is connected with the source electrode of the first MOS tube and is connected with the first end of the second resistor and the cathode of the first voltage stabilizing diode, and the anode of the first voltage stabilizing diode and the second end of the second resistor are both grounded.
Optionally, the preceding stage power supply unit includes a first diode, a first inductor, a first resistor, and a first polarity capacitor;
the anode of the first diode is connected with the alternating current power supply unit, the cathode of the first diode, the first end of the first inductor and the first end of the first resistor are connected in common, the second end of the first inductor, the second end of the first resistor and the anode of the first polarity capacitor are connected in common and connected to the control module power supply unit, and the cathode of the first polarity capacitor is grounded.
Optionally, the preceding stage power supply unit includes a first diode, a first inductor, a first resistor, a first polarity capacitor, and a third polarity capacitor;
the positive pole of first diode with alternating current power supply unit's output is connected, the negative pole of first diode the first end of first inductance the positive pole of first polarity electric capacity with the first end common connection of first resistance, the second end of first inductance the second end of first resistance with the positive pole common connection of third polarity electric capacity, and be connected to control module power supply unit, the negative pole of first polarity electric capacity with the negative pole of third polarity electric capacity all grounds.
Optionally, the pre-stage power supply unit includes at least one polarity capacitor.
Optionally, the control signal output by the control signal output unit is one of a PWM signal, a return-to-zero code signal, an IIC signal, an SPI signal, and a UART signal.
Optionally, the post-stage constant current unit includes at least one constant current branch.
The embodiment also provides an LED constant current system, which includes the above-mentioned control circuit of relative phase, where the control circuit of relative phase includes an ac power supply unit, a preceding stage constant current unit, a succeeding stage constant current unit, and a control signal output unit;
the output end of the alternating current power supply unit, the input end of the front stage constant current unit and the input end of the rear stage constant current unit are commonly connected, the controlled end of the rear stage constant current unit is connected with the control end of the control signal output unit, and the power end of the control signal output unit is connected with the alternating current power supply unit;
the alternating current power supply unit is used for outputting alternating current voltage to the preceding stage constant current unit and supplying power to the control signal output unit;
the preceding stage constant current unit is used for carrying out primary constant current processing on the alternating current voltage output by the alternating current power supply unit;
the rear-stage constant current unit is used for performing secondary constant current processing on the current subjected to the constant current processing by the front-stage constant current unit when the control signal output unit outputs a control signal;
the control signal output unit comprises a preceding stage power supply unit, a control module power supply unit and a control module which are sequentially connected in series, wherein the preceding stage power supply unit is connected with the preceding stage constant current unit;
the alternating current power supply unit is also used for charging the preceding stage power supply unit.
The control circuit of the relative phase in the technical scheme of the utility model is provided with an alternating current power supply unit, a front-stage constant current unit, a rear-stage constant current unit and a control signal output unit, wherein the output end of the alternating current power supply unit, the input end of the front-stage constant current unit and the input end of the rear-stage constant current unit are commonly connected, the controlled end of the rear-stage constant current unit is connected with the control end of the control signal output unit, and the power supply end of the control signal output unit is connected with the alternating current power supply unit. The control signal output unit comprises a preceding stage power supply unit, a control module power supply unit and a control module which are sequentially connected in series. The alternating current power supply unit supplies power to a circuit of the whole system, the control signal output unit controls the state of the rear constant current unit through the output control signal, and the front power supply unit in the control signal output unit passes through the front constant current unit, so that when the alternating current power supply unit charges the front power supply unit in the control signal output unit, the problem that the input current waveform of a wire network in the current intelligent LED constant current system cannot meet the relative phase in an IEC61000-3-23 file is solved, and the input current waveform of the wire network in the LED constant current system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a waveform diagram of an embodiment of a relative phase control circuit;
FIG. 2 is a block diagram of an embodiment of a relative phase control circuit according to the present invention;
FIG. 3 is a circuit diagram illustrating an embodiment of a relative phase control circuit in the related art;
FIG. 4 is a schematic circuit diagram illustrating another embodiment of a relative phase control circuit in the related art;
FIG. 5 is a schematic circuit diagram of an embodiment of a relative phase control circuit according to the present invention;
fig. 6 is a schematic circuit diagram of another embodiment of a relative phase control circuit according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 101 | AC power supply unit | L1 | |
| 102 | Preceding stage constant current unit | DZ1 | First |
| 103 | Rear stage constant current unit | R1 | A |
| 104 | Control signal output unit | R2 | |
| 105 | Preceding stage power supply unit | Y1 | First comparator |
| AC | AC input source | M1 | First MOS transistor |
| DB1 | Bridge rectifier circuit | E1 | First polarity capacitor |
| D1 | First diode | E2 | Second polarity capacitor |
| D2 | Second diode | E3 | Third polarity capacitor |
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
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.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a relative phase control circuit, which is applied to an LED constant current system, wherein the LED constant current system is a driving power supply of LED lighting equipment and belongs to one of linear power supplies. The intelligent LED constant current system mainly comprises an alternating current power supply unit, a preceding stage constant current unit, a control signal output unit and a subsequent stage constant current unit. As shown in figure 1. Due to the existence of the previous-stage power supply part in the control signal output unit, the waveform of the input current of the wire network is shown as the waveforms of the input current I1 and the input current I2 in fig. 1, and the requirements of the relative phase in IEC61000-3-23 files (harmonic current emission standard files, electromagnetic compatibility limit value harmonic current emission limit values, and input current of each phase of equipment is less than or equal to 16A.) cannot be met.
Improving the input current waveform in the LED constant current system, with the fourth dotted line to the fifth dotted line in fig. 1, and a half-wave period being 180 ° phase, it is necessary to make the input current from the fourth dotted line to the first dotted line in fig. 1 before 60 degrees or 60 degrees reach a 5% current threshold; the input current at the fourth dotted line to the second dotted line reaches a current peak before 65 degrees or 65 degrees; the input current at the fourth dotted line to the third dotted line is not less than the 5% current threshold at 90 degrees. The input current of the LED constant current system can meet the requirement of the relative phase in the IEC61000-3-23 file.
In order to solve the above problem, in an embodiment of the present invention, referring to fig. 2, the control circuit of the relative phase includes an ac power supply unit 101, a front stage constant current unit 102, a rear stage constant current unit 103, and a control signal output unit 104;
the output end of the alternating current power supply unit 101, the input end of the front stage constant current unit 102 and the input end of the rear stage constant current unit 103 are commonly connected, the controlled end of the rear stage constant current unit 103 is connected with the control end of the control signal output unit 104, and the power end of the control signal output unit 104 is connected with the alternating current power supply unit 101;
the alternating current power supply unit 101 is configured to output an alternating current voltage to the preceding stage constant current unit 102 and supply power to the control signal output unit 104;
the preceding-stage constant current unit 102 is configured to perform primary constant current processing on the ac voltage output by the ac power supply unit 101;
the rear stage constant current unit 103 is configured to perform a second stage constant current processing on the current subjected to the constant current processing by the front stage constant current unit 102 when the control signal output unit 104 outputs the control signal;
the control signal output unit 104 comprises a preceding power supply unit 105, a control module power supply unit and a control module which are sequentially connected in series, wherein the preceding power supply unit 105 is connected with the preceding constant current unit 102;
the ac power supply unit 101 is further configured to charge the front stage power supply unit 105.
In the related art, referring to fig. 3, the AC power supply unit 101 includes an AC input source AC, a bridge rectifier circuit DB1, and a second diode D2; the front-stage constant current unit 102 comprises a first comparator Y1, a second polarity capacitor E2, a first MOS transistor M1 and a second resistor R2; the pre-stage power supply unit 105 includes a first diode D1, a first inductor L1, a first resistor R1, and a first polarity capacitor E1. Furthermore, the positive electrode of the second polarity capacitor E2 is the input terminal of the preceding constant current unit 102, the negative electrode of the second polarity capacitor E2 is connected to the drain of the first MOS transistor M1, the gate of the first MOS transistor M1 is connected to the output terminal of the first comparator Y1, the positive-phase input terminal of the first comparator Y1 is a reference voltage terminal, the negative-phase input terminal of the first comparator Y1 is connected to the source of the first MOS transistor M1 and to the first terminal of the second resistor R2, and the second terminal of the second resistor R2 is grounded; the anode of the first diode D1 is connected to the ac power supply unit 101, the cathode of the first diode D1, the first end of the first inductor L1 and the first end of the first resistor R1 are commonly connected, the second end of the first inductor L1, the second end of the first resistor R1 and the anode of the first polar capacitor E1 are commonly connected to the control module power supply unit, and the cathode of the first polar capacitor E1 is grounded. It is understood that the ac power supply unit 101 supplies power to the entire system circuit, and the control signal output unit 104 controls the state of the rear stage constant current unit 103 by the output control signal, wherein the front stage power supply unit 105 in the control signal output unit 104 passes through the second resistor R2 in the front stage constant current unit 102, and accordingly an input current waveform like I1 in fig. 1 may occur.
In the related art, referring to fig. 4, the AC power supply unit 101 includes an AC input source AC, a bridge rectifier circuit DB1, and a second diode D2; the front-stage constant current unit 102 comprises a first comparator Y1, a second polarity capacitor E2, a first MOS transistor M1 and a second resistor R2; the pre-stage power supply unit 105 includes a first diode D1, a first inductor L1, a first resistor R1, a first polarity capacitor E1, and a third polarity capacitor E3. Furthermore, the positive electrode of the second polarity capacitor E2 is the input terminal of the preceding constant current unit 102, the negative electrode of the second polarity capacitor E2 is connected to the drain of the first MOS transistor M1, the gate of the first MOS transistor M1 is connected to the output terminal of the first comparator Y1, the positive-phase input terminal of the first comparator Y1 is a reference voltage terminal, the negative-phase input terminal of the first comparator Y1 is connected to the source of the first MOS transistor M1 and to the first terminal of the second resistor R2, and the second terminal of the second resistor R2 is grounded; the anode of the first diode D1 is connected to the output end of the ac power supply unit 101, the cathode of the first diode D1, the first end of the first inductor L1, the anode of the first polar capacitor E1 and the first end of the first resistor R1 are connected in common, the second end of the first inductor L1, the second end of the first resistor R1 and the anode of the third polar capacitor E3 are connected in common and connected to the control module power supply unit, and the cathode of the first polar capacitor E1 and the cathode of the third polar capacitor E3 are both grounded. It is understood that the ac power supply unit 101 supplies power to the entire system circuit, and the control signal output unit 104 controls the state of the rear stage constant current unit 103 by the output control signal, wherein the front stage power supply unit 105 in the control signal output unit 104 passes through the second resistor R2 in the front stage constant current unit 102, so that the corresponding input current waveform as I2 in fig. 1 may appear.
In an embodiment, referring to fig. 5, the AC power supply unit 101 includes an AC input source AC, a bridge rectifier circuit DB1, and a second diode D2; the front-stage constant current unit 102 comprises a first comparator Y1, a second polarity capacitor E2, a first MOS transistor M1, a first voltage-stabilizing diode DZ1 and a second resistor R2; the pre-stage power supply unit 105 includes a first diode D1, a first inductor L1, a first resistor R1, and a first polarity capacitor E1. Further, the positive electrode of the second polarity capacitor E2 is the input terminal of the preceding constant current unit 102, the negative electrode of the second polarity capacitor E2 is connected to the drain of the first MOS transistor M1, the gate of the first MOS transistor M1 is connected to the output terminal of the first comparator Y1, the positive-phase input terminal of the first comparator Y1 is a reference voltage terminal, the inverting input terminal of the first comparator Y1 is connected to the source of the first MOS transistor M1, and is connected to the first end of the second resistor R2 and the cathode of the first voltage regulator diode DZ1, and the anode of the first voltage regulator diode DZ1 and the second end of the second resistor R2 are both grounded; the pre-stage power supply unit 105 comprises a first diode D1, a first inductor L1, a first resistor R1 and a first polarity capacitor E1; the anode of the first diode D1 is connected to the ac power supply unit 101, the cathode of the first diode D1, the first end of the first inductor L1 and the first end of the first resistor R1 are commonly connected, the second end of the first inductor L1, the second end of the first resistor R1 and the anode of the first polar capacitor E1 are commonly connected to the control module power supply unit, and the cathode of the first polar capacitor E1 is connected to GND. It should be noted that, the output control signal controls the state of the post-stage constant current unit 103, and the negative electrode of the first polarity capacitor E1 is connected to the source of the first MOS transistor M1, according to the formula Vref1 (I1+ I2) × R2, when the AC input source AC charges the first polarity capacitor E1, so as to obtain the input current waveform as I3 in fig. 1, where the first zener diode DZ1 is used to avoid the instantaneous voltage at the inverting input terminal of the first comparator Y1 from being too high to damage the first comparator Y1; if the negative electrode of the first polarity capacitor E1 is connected to the system ground, an input current waveform like I1 in fig. 1 is generated, and the peak point of the input current waveform cycle of the machine detection I1 used is at point B, rather than point a, which results in an increase in the phase angle between the machine detection input voltage and the input current peak, and the requirement of the relative phase in the IEC61000-3-23 document cannot be met.
In an embodiment, referring to fig. 6, the AC power supply unit 101 includes an AC input source AC, a bridge rectifier circuit DB1, and a second diode D2; the front-stage constant current unit 102 comprises a first comparator Y1, a second polarity capacitor E2, a first MOS transistor M1, a first voltage-stabilizing diode DZ1 and a second resistor R2; the pre-stage power supply unit 105 includes a first diode D1, a first inductor L1, a first resistor R1, a first polarity capacitor E1, and a third polarity capacitor E3. Further, the positive electrode of the second polarity capacitor E2 is the input terminal of the preceding constant current unit 102, the negative electrode of the second polarity capacitor E2 is connected to the drain of the first MOS transistor M1, the gate of the first MOS transistor M1 is connected to the output terminal of the first comparator Y1, the positive-phase input terminal of the first comparator Y1 is a reference voltage terminal, the inverting input terminal of the first comparator Y1 is connected to the source of the first MOS transistor M1, and is connected to the first end of the second resistor R2 and the cathode of the first voltage regulator diode DZ1, and the anode of the first voltage regulator diode DZ1 and the second end of the second resistor R2 are both grounded; the pre-stage power supply unit 105 comprises a first diode D1, a first inductor L1, a first resistor R1 and a first polarity capacitor E1; the anode of the first diode D1 is connected to the output end of the ac power supply unit 101, the cathode of the first diode D1, the first end of the first inductor L1, the anode of the first polar capacitor E1 and the first end of the first resistor R1 are commonly connected, the second end of the first inductor L1, the second end of the first resistor R1 and the anode of the third polar capacitor E3 are commonly connected and connected to the control module power supply unit, and the cathode of the first polar capacitor E1 and the cathode of the third polar capacitor E3 are both connected to GND. It should be noted that, the output control signal controls the state of the post-stage constant current unit 103, and the cathodes of the first polarity capacitor E1 and the third polarity capacitor E3 are connected to the source of the first MOS transistor M1, according to the formula Vref1 ═ I3+ I4 × R2, when the AC input source AC charges the first polarity capacitor E1 and the third polarity capacitor E3, so as to obtain the input current waveform as I3 in fig. 1, wherein the first zener diode DZ1 is used to avoid the instantaneous voltage at the inverting input terminal of the first comparator Y1 being too high to damage the first comparator Y1; if the cathodes of the first polar capacitor E1 and the third polar capacitor E3 are connected to the system ground, an input current waveform like I2 in fig. 1 is generated, and the peak point of the cycle of the input current waveform of the machine detection I2 is at the point D, but not at the point C, which results in that the phase angle of the peak value of the machine detection input voltage and the input current is increased, and the requirement of the relative phase in the IEC61000-3-23 document cannot be met.
It should be noted that, in the above embodiment, the pre-stage power supply unit 105 may include, but is not limited to, one polar capacitor, and may also include a plurality of polar capacitors; the control signal output by the control signal output unit 104 may be, but is not limited to, a PWM signal, a return-to-zero code signal, an IIC signal, and an SPI signal; the post-stage constant current unit 103 may include, but is not limited to, one constant current branch, or may include a plurality of constant current branches; the control module power supply unit can be composed of a single-stage AC-DC power supply but not limited to the single-stage AC-DC power supply, and can also be composed of an AC-DC-DC multi-stage power supply; the communication mode of the control module in the control signal output unit 104 may be, but is not limited to, WIFI, bluetooth, or Zigbee.
Based on the above embodiments, the control circuit of the relative phase in the technical solution of the present invention includes an ac power supply unit 101, a front stage constant current unit 102, a rear stage constant current unit 103, and a control signal output unit 104, wherein an output terminal of the ac power supply unit 101, an input terminal of the front stage constant current unit 102, and an input terminal of the rear stage constant current unit 103 are commonly connected, a controlled terminal of the rear stage constant current unit 103 is connected to a control terminal of the control signal output unit 104, and a power terminal of the control signal output unit 104 is connected to the ac power supply unit 101. The control signal output unit 104 includes a preceding stage power supply unit 105, a control module power supply unit, and a control module, which are connected in series in sequence. The alternating current power supply unit 101 supplies power to the whole system circuit, the control signal output unit 104 controls the state of the rear constant current unit 103 through the output control signal, wherein the front power supply unit 105 in the control signal output unit 104 passes through the front constant current unit 102, so that when the alternating current power supply unit 101 charges the front power supply unit 105 in the control signal output unit 104, the problem that the line network input current waveform in the current intelligent LED constant current system cannot meet the relative phase in the IEC61000-3-23 file is solved, and the line network input current waveform in the LED constant current system is improved.
In order to achieve the above object, the present invention further provides an LED constant current system, which includes the above-mentioned control circuit of relative phase, where the control circuit of relative phase includes an ac power supply unit 101, a former stage constant current unit 102, a latter stage constant current unit 103, and a control signal output unit 104;
the output end of the alternating current power supply unit 101, the input end of the front stage constant current unit 102 and the input end of the rear stage constant current unit 103 are commonly connected, the controlled end of the rear stage constant current unit 103 is connected with the control end of the control signal output unit 104, and the power end of the control signal output unit 104 is connected with the alternating current power supply unit 101;
the alternating current power supply unit 101 is configured to output an alternating current voltage to the preceding stage constant current unit 102 and supply power to the control signal output unit 104;
the preceding-stage constant current unit 102 is configured to perform primary constant current processing on the ac voltage output by the ac power supply unit 101;
the rear stage constant current unit 103 is configured to perform a second stage constant current processing on the current subjected to the constant current processing by the front stage constant current unit 102 when the control signal output unit 104 outputs the control signal;
the control signal output unit 104 comprises a preceding stage power supply unit 105, a control module power supply unit and a control module which are sequentially connected in series, wherein the preceding stage power supply unit is connected with the preceding stage constant current unit;
the ac power supply unit 101 is further configured to charge the front stage power supply unit 105.
The specific structure of the LED constant current system refers to the above embodiments, and since the LED constant current system adopts all the technical solutions of all the embodiments of the control circuit of the relative phase, all the beneficial effects brought by the technical solutions of the above embodiments are at least achieved, and are not described in detail herein.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention that are made by using the contents of the specification and the drawings or directly/indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (10)
1. The control circuit of the relative phase is characterized by comprising an alternating current power supply unit, a front-stage constant current unit, a rear-stage constant current unit and a control signal output unit;
the output end of the alternating current power supply unit, the input end of the front stage constant current unit and the input end of the rear stage constant current unit are commonly connected, the controlled end of the rear stage constant current unit is connected with the control end of the control signal output unit, and the power end of the control signal output unit is connected with the alternating current power supply unit;
the alternating current power supply unit is used for outputting alternating current voltage to the preceding stage constant current unit and supplying power to the control signal output unit;
the preceding stage constant current unit is used for carrying out primary constant current processing on the alternating current voltage output by the alternating current power supply unit;
the rear-stage constant current unit is used for performing secondary constant current processing on the current subjected to the constant current processing by the front-stage constant current unit when the control signal output unit outputs a control signal;
the control signal output unit comprises a preceding stage power supply unit, a control module power supply unit and a control module which are sequentially connected in series, wherein the preceding stage power supply unit is connected with the preceding stage constant current unit;
the alternating current power supply unit is also used for charging the preceding stage power supply unit.
2. The control circuit of relative phase according to claim 1, wherein the ac power supply unit includes an ac input source, a bridge rectifier circuit, and a second diode;
one end of the alternating current input source is connected with one input end of the bridge rectifier circuit, the other end of the alternating current input source is connected with the other input end of the bridge rectifier circuit, the output end of the bridge rectifier circuit is connected with the anode of the second diode, and the cathode of the second diode is the output end of the alternating current power supply unit.
3. The relative phase control circuit according to claim 2, wherein the preceding stage constant current unit includes a first comparator, a second polarity capacitor, a first MOS transistor, and a second resistor;
the positive electrode of the second polar capacitor is the input end of the preceding stage constant current unit, the negative electrode of the second polar capacitor is connected with the drain electrode of the first MOS tube, the grid electrode of the first MOS tube is connected with the output end of the first comparator, the positive phase input end of the first comparator is a reference voltage end, the negative phase input end of the first comparator is connected with the source electrode of the first MOS tube and is connected with the first end of the second resistor, and the second end of the second resistor is grounded.
4. The relative phase control circuit according to claim 2, wherein the preceding stage constant current unit comprises a first comparator, a second polarity capacitor, a first MOS transistor, a first zener diode, and a second resistor;
the positive electrode of the second polar capacitor is the input end of the preceding stage constant current unit, the negative electrode of the second polar capacitor is connected with the drain electrode of the first MOS tube, the grid electrode of the first MOS tube is connected with the output end of the first comparator, the positive phase input end of the first comparator is a reference voltage end, the negative phase input end of the first comparator is connected with the source electrode of the first MOS tube and is connected with the first end of the second resistor and the cathode of the first voltage stabilizing diode, and the anode of the first voltage stabilizing diode and the second end of the second resistor are both grounded.
5. The relative phase control circuit of claim 2, wherein the pre-stage power supply unit comprises a first diode, a first inductor, a first resistor, and a first polarity capacitor;
the anode of the first diode is connected with the alternating current power supply unit, the cathode of the first diode, the first end of the first inductor and the first end of the first resistor are connected in common, the second end of the first inductor, the second end of the first resistor and the anode of the first polarity capacitor are connected in common and connected to the control module power supply unit, and the cathode of the first polarity capacitor is grounded.
6. The relative phase control circuit of claim 2, wherein the pre-stage power supply unit comprises a first diode, a first inductor, a first resistor, a first polarity capacitor, and a third polarity capacitor;
the positive pole of first diode with alternating current power supply unit's output is connected, the negative pole of first diode the first end of first inductance the positive pole of first polarity electric capacity with the first end common connection of first resistance, the second end of first inductance the second end of first resistance with the positive pole common connection of third polarity electric capacity, and be connected to control module power supply unit, the negative pole of first polarity electric capacity with the negative pole of third polarity electric capacity all grounds.
7. A control circuit of relative phase according to claim 5 or 6, characterised in that the pre-stage power supply unit comprises at least one polarity capacitor.
8. The relative phase control circuit according to any one of claims 1 to 6, wherein the control signal output unit outputs a control signal which is one of a PWM signal, a return-to-zero code signal, an IIC signal, an SPI signal, and a UART signal.
9. The relative phase control circuit of claim 1, wherein the post-stage constant current unit comprises at least one constant current branch.
An LED constant current system, characterized in that it comprises a relative phase control circuit according to any one of claims 1 to 9.
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| CN202121975586.5U CN215818691U (en) | 2021-08-20 | 2021-08-20 | Control circuit of relative phase and LED constant current system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113709937A (en) * | 2021-08-20 | 2021-11-26 | 深圳市明微电子股份有限公司 | Control circuit of relative phase and LED constant current system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113709937A (en) * | 2021-08-20 | 2021-11-26 | 深圳市明微电子股份有限公司 | Control circuit of relative phase and LED constant current system |
| CN113709937B (en) * | 2021-08-20 | 2024-09-20 | 深圳市明微电子股份有限公司 | Control circuit of relative phase and LED constant current system |
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