CN112911765A - Light/speed regulator and switching method of phase-cut mode thereof - Google Patents
Light/speed regulator and switching method of phase-cut mode thereof 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
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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
- H05B47/20—Responsive to malfunctions or to light source life; for protection
Abstract
The invention discloses a light/speed regulator and a switching method of a phase-cut mode thereof, wherein the light/speed regulator comprises a switch tube, an MCU circuit, an AD/DC conversion circuit and a load detection circuit; the switching tube is connected between a live wire of the alternating current power supply and a load; the input of the AD/DC conversion circuit is connected with an alternating current power supply, and the output of the AD/DC conversion circuit is connected to a power supply end of the MCU circuit; the output of the MCU circuit is connected to the switching tube; the input end of the load detection circuit is connected with the two ends of the switch tube; the output end of the load detection circuit is connected with the input end of the MCU circuit, the MCU circuit judges the type of the load through the voltage at two ends of the switch tube obtained by the load detection circuit, and switches the working mode of the light/speed regulator by outputting a control signal to the switch tube. The invention can judge the load type and further switch the phase-cut mode of the light/speed regulator, thereby avoiding the defect caused by the mismatching of the load type and the phase-cut mode of the light/speed regulator.
Description
Technical Field
The invention relates to the technical field of dimming/speed regulators, in particular to a dimming/speed regulator and a phase-cut mode switching method thereof.
Background
The prior art light-adjusting/speed-adjusting device utilizes a silicon controlled circuit to change a sine wave shape by adjusting the conduction angle of each half wave of alternating current so as to change the effective value of the alternating current, thereby realizing the purpose of light-adjusting/speed-adjusting. The phase-cut modes of the prior art dimming/speed regulator include a front phase-cut mode, a back phase-cut mode and a front and back phase-cut mode, the dimming/speed regulator can work in the front phase-cut mode (as shown in fig. 1) and can also work in the back phase-cut mode (as shown in fig. 2), and can only work in one of the above phase-cut modes for different loads (including capacitive load, resistive load or inductive load), since the compatibility of the back phase-cut mode is better than that of the front phase-cut mode, the phase-cut mode is usually set in the back phase-cut mode, but when the dimming/speed regulator of the prior art is used in the inductive load, the back phase-cut mode may cause the switch tube voltage to be too high and damaged, so the operating mode of the dimming/speed regulator needs to be switched to the front phase-cut module, and also for some poor compatibility, the LED lamp of capacitive load which has the problems of lamp flashing and the like can also switch the working mode of the dimming/speed regulator to another phase-cutting module, so that the compatibility of the LED lamp is better. However, in the prior art, no such dimmer/governor is available that can automatically switch the phase-cut mode. Therefore, there is a need for a dimmer/speed regulator capable of automatically switching the phase-switching mode, so as to meet the application requirements of people for the dimmer/speed regulator.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a dimming/speed regulator and a switching method of a phase-cut mode thereof, wherein a load detection circuit is added to detect the voltages at two ends of a switching tube to judge the load type and further switch the phase-cut mode of the dimming/speed regulator, so that the defects caused by mismatching of the load type and the phase-cut mode of the dimming/speed regulator are avoided.
The technical scheme adopted by the invention for solving the technical problems is as follows: a light/speed regulator is connected between a live wire and a load of an alternating current power supply and is connected with a zero line of the alternating current power supply through the load; the dimming/speed regulator comprises a switching tube, an MCU circuit and an AD/DC conversion circuit; the switching tube is connected between a live wire of an alternating current power supply and a load; the input of the AD/DC conversion circuit is connected with an alternating current power supply, and the output of the AD/DC conversion circuit is connected to the power supply end of the MCU circuit; the output of the MCU circuit is connected to the switching tube; the input end of the load detection circuit is connected with the two ends of the switch tube so as to realize the detection of the voltage at the two ends of the switch tube; the output end of the load detection circuit is connected with the input end of the MCU circuit, the MCU circuit judges the type of the load through the voltage at two ends of the switch tube obtained by the load detection circuit, and switches the working mode of the light/speed regulator by outputting a control signal to the switch tube.
Furthermore, the dimming/speed regulator further comprises a first voltage detection circuit and a second voltage detection circuit, wherein the input end of the first voltage detection circuit is connected with the live wire of the alternating current power supply, and the output end of the first voltage detection circuit is connected to the input of the MCU circuit; the input end of the second voltage detection circuit is connected with the output end of the AD/DC conversion circuit, and the output end of the second voltage detection circuit is connected to the input end of the MCU circuit.
The MCU circuit acquires voltage value signals of the input end and the output end of the AD/DC conversion circuit through the first voltage detection circuit and the second voltage detection circuit, detects whether the working voltage of the dimming/speed regulator is in a normal range through analyzing and judging the voltage value signals, and outputs a control signal to the switch tube to switch the working mode of the dimming/speed regulator if the working voltage of the dimming/speed regulator is not in a normal range.
Furthermore, the light/speed regulator also comprises an externally-arranged switch detection circuit, the input of the externally-arranged switch detection circuit is connected with an externally-arranged switch, and the output end of the externally-arranged switch detection circuit is connected to the input of the MCU circuit; the MCU circuit obtains the on or off state of the external switch through the external switch detection circuit and controls the on and off of the switch tube by outputting a control signal to the switch tube.
The load detection circuit consists of a third resistor, a fourth resistor, a fifth resistor and a bipolar TVS transient suppression diode; one end of the third resistor is connected to a live wire of an alternating current power supply, the other end of the third resistor is connected with one end of the bipolar TVS transient suppression diode, and the other end of the bipolar TVS transient suppression diode is grounded; one end of the fourth resistor is connected to one end of the bipolar TVS transient suppression diode, and the other end of the fourth resistor is connected to the input of the MCU circuit; one end of the fifth resistor is connected to the other end of the fourth resistor, and the other end of the fifth resistor is grounded.
The load detection circuit consists of a sixth diode, an eighth resistor, a ninth resistor, an eleventh resistor, a second voltage regulator tube, a fourth capacitor and an optical coupler; the anode of the sixth diode is connected with the live wire of the alternating current power supply, the cathode of the sixth diode is connected with one end of the eighth resistor, the other end of the eighth resistor is connected with one end of the ninth resistor, the other end of the ninth resistor is connected with a load, one end of the second voltage-stabilizing tube is connected with the other end of the eighth resistor, the other end of the second voltage-stabilizing tube is connected with the first pin of the optical coupler, the fourth capacitor is connected between the first pin and the second pin of the optical coupler, the second pin of the optical coupler is connected to the other end of the ninth resistor, the third pin of the optical coupler is grounded, and the fourth pin of the optical coupler is connected to the input end of the MCU circuit; the eleventh resistor is connected between the output end of the AD/DC conversion circuit and the fourth pin of the optical coupler.
The first voltage detection circuit consists of a first resistor, a second resistor, a tenth resistor and a first voltage regulator tube; one end of the first resistor is connected to a live wire of the alternating current power supply, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to the input end of the MCU circuit; one end of the first voltage-regulator tube is connected to the other end of the second resistor, the other end of the first voltage-regulator tube is grounded, one end of the tenth resistor is connected to the other end of the second resistor, and the other end of the tenth resistor is grounded.
The second voltage detection circuit consists of a sixth resistor, a seventh resistor and a second capacitor; one end of the sixth resistor is connected to the output end of the AD/DC conversion circuit, the other end of the sixth resistor is connected to one end of the seventh resistor, and the other end of the seventh resistor is grounded; the other end of the sixth resistor is connected to the input end of the MCU circuit; and two ends of the second capacitor are respectively connected with two ends of the seventh resistor.
A method for switching phase-cut modes of a light/speed regulator comprises the following steps:
presetting a phase-cutting mode of the light/speed regulator in a post-phase-cutting mode;
the load detection circuit is used for detecting the voltage at the two ends of the switch tube and outputting the voltage to the MCU for analysis and judgment, when the voltage waveforms at the two ends of the switch tube are in a standard back phase-cut mode, the MCU judges that the load connected with the light/speed regulator is a capacitive load or a resistive load, when the voltage waveforms at the two ends of the switch tube are in a back phase-cut mode state, a reverse electromotive voltage is superposed at the two ends of the switch tube, and the reverse electromotive voltage is generated at the two ends of the switch tube when the switch tube is switched off, the MCU judges that the load connected with the light/speed regulator is an inductive load;
when the MCU judges that the load connected with the dimming/speed regulator is an inductive load, the MCU sends a signal to the switching tube, the dimming/speed regulator is switched from a back phase-cutting mode to a front phase-cutting mode, and the switching tube is switched off and arranged at a position close to a zero crossing point or a zero crossing point, so that the generated back electromotive force is reduced to the minimum and is superposed at a zero voltage position, and the switching tube works in a normal working voltage range.
Further, when the dimmer works in a single live wire state, the voltage detection circuit is used for detecting the voltages of the input end and the output end of the AD/DC conversion circuit and judging whether the voltages are in a normal power supply range, if the voltages are lower than the voltage of the normal power supply, the conduction time ton of the switching tube is correspondingly reduced, the voltages at two ends of the maximum conduction time are locked in the normal working range, if the voltages are reduced to the lowest set value and cannot work in the normal working range, the load type is judged to be incompatible with the working module at the current stage, and the working mode is automatically switched to the front cut or the back cut.
Furthermore, a voltage detection circuit is used for detecting the voltage of the output end of the AD/DC conversion circuit, when the power supply of the dimmer is just switched on and the voltage of the output end of the AD/DC conversion circuit is not stabilized in the normal working voltage range of the switching tube, the MCU outputs a control signal to the switching tube to control the switching tube to be switched off and then switched on after a period of time delay.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the load detection circuit added in the light/speed regulator to detect the voltage at two ends of the switch tube so as to judge the load type and further switch the phase-cut mode of the light/speed regulator, thereby avoiding the defect caused by the mismatching of the load type and the phase-cut mode of the light/speed regulator.
The invention is further explained in detail with the accompanying drawings and the embodiments; however, a dimmer/governor and a method for switching a phase-cut mode thereof according to the present invention are not limited to the embodiments.
Drawings
FIG. 1 is a functional block diagram of a first embodiment of the present invention;
FIG. 2 is a circuit diagram according to a first embodiment of the present invention;
FIG. 3 is a waveform across the switching tube for the dimmer operating in a leading phase mode;
FIG. 4 is a waveform across a switching tube for a dimmer operating in a trailing phase mode;
FIG. 5 is a waveform across a switching tube with inductive loads operating in a trailing phase mode;
FIG. 6 is a waveform across the switching tube for inductive loads operating in a leading phase mode;
FIG. 7 is a circuit diagram of a second embodiment of the present invention;
Detailed Description
Example one
Referring to fig. 1, the dimming/speed regulator of the present invention is connected between a live line L of an ac power supply and a Load, and is connected to a zero line N of the ac power supply through the Load; the dimming/speed regulator comprises a switch tube 1, an MCU circuit 2 and an AD/DC conversion circuit 3; the switching tube 1 is connected between a live wire L of an alternating current power supply and a Load; the input of the AD/DC conversion circuit 3 is connected with an alternating current power supply, and the output of the AD/DC conversion circuit 3 is connected to the power supply end of the MCU circuit 2; the output of the MCU circuit 2 is connected to the switch tube 1; the dimming/speed regulator further comprises a load detection circuit 4, wherein the input end of the load detection circuit 4 is connected to the two ends of the switch tube 1 so as to detect the voltage at the two ends of the switch tube 1; the output end of the load detection circuit 4 is connected to the input end of the MCU circuit 2, the MCU circuit 2 judges the type of the load through the voltage at two ends of the switch tube obtained by the load detection circuit 4, and switches the working mode of the light/speed regulator by outputting a control signal to the switch tube 1.
Further, the dimming/speed regulator further comprises a first voltage detection circuit 51 and a second voltage detection circuit 52, wherein an input end of the first voltage detection circuit 51 is connected with the live wire L of the alternating current power supply, and an output end of the first voltage detection circuit 51 is connected to the input of the MCU circuit 2; the input end of the second voltage detection circuit 52 is connected to the output end of the AD/DC conversion circuit 3, and the output end of the second voltage detection circuit 52 is connected to the input of the MCU circuit 2. The voltage detection circuit is used for detecting the voltage value of input voltage on a live wire L of an alternating current power supply and then inputting the voltage value into the single chip microcomputer (namely the MCU) to judge whether the voltage works in a normal range or not, so that the single chip microcomputer controls the MOS tube to input a forward switching signal or a backward switching signal.
In this embodiment, the MCU circuit 2 obtains the voltage value signals of the input and output terminals of the AD/DC converter circuit 3 through the first voltage detection circuit 51 and the second voltage detection circuit 52, and analyzes and judges the voltage value signals to detect whether the operating voltage of the dimmer/speed regulator is within a normal range, and if not, outputs a control signal to the switching tube 1 to switch the operating mode of the dimmer/speed regulator.
Further, the light/speed regulator further comprises an externally-arranged switch detection circuit 6, wherein the input of the externally-arranged switch detection circuit 6 is connected with an externally-arranged switch, and the output end of the externally-arranged switch detection circuit 6 is connected to the input of the MCU circuit 2; the MCU circuit 2 obtains the on or off state of the external switch through the external switch detection circuit 6, and controls the on and off of the switch tube by outputting a control signal to the switch tube 1. The external switch detection circuit 6 is used for detecting the state (on or off) of the external switch of the light/speed regulator and inputting the signal to the single chip Microcomputer (MCU), so that the single chip microcomputer controls the on and off states of the MOS.
As shown in fig. 2, the switching device of the light/speed regulator of the present invention includes a first MOS transistor Q1 and a first MOS transistor Q2, the drain of the first MOS transistor Q1 is connected to the live line L of the ac power source, the source of the first MOS transistor Q1 is grounded, the drain of the second MOS transistor Q2 is connected to the load, the source of the second MOS transistor Q2 is grounded, and the gates of the first MOS transistor Q1 and the first MOS transistor Q2 are respectively connected to the output of the MCU circuit 2.
In this embodiment, the load detection circuit is composed of a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a bipolar TVS transient suppression diode D4; one end of the third resistor R3 is connected to the live line L of the ac power supply, the other end of the third resistor R3 is connected to one end of the bipolar TVS transient suppression diode D4, and the other end of the bipolar TVS transient suppression diode D4 is grounded; one end of the fourth resistor R4 is connected to one end of the bipolar TVS transient suppression diode D4, and the other end of the fourth resistor R4 is connected to the input of the MCU circuit 2; one end of the fifth resistor R5 is connected to the other end of the fourth resistor R4, and the other end of the fifth resistor R5 is grounded. The load detection circuit is used for detecting the load type, detecting the voltage at two ends of the MOS tube to judge the type of the load output by the MOS tube and inputting a signal into the single chip microcomputer (namely an MCU circuit), so that the single chip microcomputer controls the MOS tube to input a front-cut or rear-cut signal. When an inductive Load is connected, the voltage of the L line and the Load passes through the resistor R3, the resistor R4 and the resistor R5, the divided voltage is input into the MCU, and the MCU judges that the original default back switch is switched to the front switch working mode when the voltage is higher than the set voltage (such as 1.2V).
In this embodiment, the first voltage detection circuit 51 is composed of a first resistor R1, a second resistor R2, a tenth resistor R10, and a first voltage regulator ZD 1; one end of the first resistor R1 is connected to the live line L of the ac power supply, the other end of the first resistor R1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the input end of the MCU circuit 2; one end of the first regulator ZD1 is connected to the other end of the second resistor R2, the other end of the first regulator ZD1 is grounded, one end of the tenth resistor R10 is connected to the other end of the second resistor R2, and the other end of the tenth resistor R10 is grounded. The voltage detection circuit can detect that the voltage divided by the input voltage through the resistor R1, the resistor R2 and the resistor R11 is input to the MCU, and when the MCU judges that the voltage is lower than the set voltage such as (1V), the on-time Ton of the MOS tube is adjusted and reduced to provide the input working voltage.
In this embodiment, the second voltage detecting circuit 52 is composed of a sixth resistor R6, a seventh resistor R7 and a second capacitor C2; one end of the sixth resistor R6 is connected to the output end of the AD/DC conversion circuit 2, the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is grounded; the other end of the sixth resistor R6 is connected to the input end of the MCU circuit 2; two ends of the second capacitor C2 are respectively connected with two ends of the seventh resistor R7.
As shown in fig. 1 to 6, the method for switching the phase-cut mode of the dimmer/speed regulator of the present invention includes the following steps:
presetting a phase-cutting mode of the light/speed regulator in a post-phase-cutting mode;
the load detection circuit 4 is used for detecting the voltage at the two ends of the switch tube 1 and inputting the voltage to the MCU circuit 2 for analysis and judgment, when the voltage waveforms at the two ends of the switch tube 1 are in a standard back phase-cut mode (as shown in figure 4), the MCU circuit 2 judges that the load connected with the dimming/speed regulator is a capacitive load or a resistive load, when the voltage waveforms at the two ends of the switch tube 1 are in a back phase-cut mode state, a reverse electromotive voltage is superposed on the voltage waveforms at the two ends of the switch tube 1, and the reverse electromotive voltage is generated at the two ends of the switch tube 1 when the switch tube 1 is switched off (as shown in figure 5), and the MCU circuit 2 judges that the load connected with the dimming/speed regulator is;
the load detection circuit 4 judges the load type by detecting the voltage at the two ends of the switch tube 1, presets the dimming/speed regulator to work in a trailing phase mode, if the waveforms at the two ends of the switch tube 1 are as shown in fig. 5, can judge the accessed load as an inductive load, because the inductive load generates a reverse electromotive force after the switch tube is switched off, the voltage is close to the voltage when the switch tube is switched off; conversely, if the measured waveform is as shown in FIG. 4, the load is a capacitive or resistive load.
When the MCU circuit 2 determines that the load connected to the dimming/speed regulator is an inductive load, the MCU circuit 2 sends a signal to the switching tube 1 to switch the dimming/speed regulator from the back-phase-cut mode to the front-phase-cut mode, and turns off the switching tube 1 to be set at a position close to a zero-crossing point or a zero-crossing point, so that the generated back electromotive force is minimized and superimposed at a zero-voltage position (as shown in fig. 6), thereby operating the switching tube 1 in a normal operating voltage range.
Further, when the dimmer operates in a single hot wire state, the voltage detection circuits 51 and 52 are used to detect the voltages at the input terminal and the output terminal of the AD/DC conversion circuit 3, and determine whether the voltages are within the normal power supply range, if the voltages are lower than the normal power supply voltage, the on-time ton of the switching tube is correspondingly reduced, and the voltage at the two ends of the maximum on-time falls within the normal operating range (as shown in fig. 3), and if the voltages are not within the normal operating range when the voltages are reduced to the lowest setting value, it is determined that the load type is not compatible with the operating module at the current stage, and the operating mode is automatically switched to the forward-cut mode or the backward-cut mode.
When the MCU detects an inductive load, the generated back electromotive voltage is superposed at two ends of the switch tube 1 when the switch tube is switched off, and the switch tube 1 is easy to break down due to overhigh voltage. At this time, the working mode of the light/speed regulator can be automatically switched to a front phase-cutting mode, the waveforms at two ends of the accessed inductive load switch tube 1 are shown in fig. 6, the switch tube 1 is switched off and arranged at a position close to a zero crossing point or a zero crossing point during front phase cutting, so that the generated back electromotive force is reduced to the minimum and is superposed at a position of zero voltage, and at this time, the switch tube 1 can work in a normal working voltage range.
When the light/speed regulator works in a single live wire (without a zero wire), the circuit detection circuit can judge that when the conduction time ton of the switching tube is increased, as shown in fig. 1 and fig. 3, the voltage at the input end a of the AC/DC conversion circuit 3 is reduced along with the reduction, when the half period is close to T/2, the voltage at the output end B of the AC/DC conversion circuit 3 is reduced due to the insufficient power supply of the AC/DC conversion circuit 3, and at this time, the driving voltage of the switching tube 1 is insufficient, the heating is high enough and the switching tube is damaged, a power supply voltage detection circuit is added at the input end and the output end of the AC/DC conversion circuit 3 to judge whether the voltage is in the normal power supply range, if the voltage is lower than the normal power supply voltage, the conduction time ton of the switching tube is correspondingly reduced, and the voltage at the two ends of the maximum conduction time is locked to be in the normal working, if the load type is not compatible with the working module when the load type is reduced to the lowest set value and the working module does not work in the normal working range, the working mode is automatically switched to the front phase-cutting mode or the rear phase-cutting mode.
Further, the voltage detection circuit 52 is used to detect the voltage at the output end of the AD/DC conversion circuit 3, when the dimmer power supply is just switched on and the voltage at the output end of the AD/DC conversion circuit 3 is not stabilized in the normal operating voltage range of the switching tube, the MCU circuit 2 outputs a control signal to the switching tube 1 to control the switching tube 1 to be turned off and then turned on after a period of time delay.
By using the voltage detection of the output end B of the AC/DC conversion circuit 3, when the power supply of the light/speed regulator is just switched on and the voltage of the output end B of the AC/DC conversion circuit 3 is not stabilized in the normal working voltage interval of the switching tube, the MCU outputs a control signal to control the switching tube to be switched off, and the switching tube is switched on after a period of time delay. The method can solve the problem that the switch tube is damaged after serious heating due to insufficient driving voltage during power-on.
Example two
Referring to fig. 7, a difference between the dimming/speed regulator and the switching method of the phase-cut mode thereof of the present invention and the first embodiment is that the load detection circuit 4 is composed of a sixth diode R6, an eighth resistor R8, a ninth resistor R9, an eleventh resistor R11, a second voltage regulator ZD2, a fourth capacitor C4, and a photo-coupler U1; the anode of the sixth diode D6 is connected to the live wire L of the ac power supply, the cathode of the sixth diode D6 is connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected to one end of the ninth resistor R9, the other end of the ninth resistor R9 is connected to a Load, one end of the second voltage regulator ZD2 is connected to the other end of the eighth resistor R8, the other end of the second voltage regulator ZD2 is connected to the first pin of the optocoupler U1, the fourth capacitor C4 is connected between the first pin and the second pin of the optocoupler U1, the second pin of the optocoupler U1 is connected to the other end of the ninth resistor R9, the third pin of the optocoupler U1 is grounded, and the fourth pin of the optocoupler U1 is connected to the input terminal of the MCU circuit 2; the eleventh resistor R11 is connected between the output terminal of the AD/DC conversion circuit 3 and the fourth pin of the optical coupler U1. When an inductive Load is connected, the voltage of an L line and the Load passes through the resistor R8, and when the voltage divided by the resistor R9 is higher than the voltage of the voltage stabilizing tube, the 1 pin and the 2 pin of the optical coupler U1 work, so that the 4 pin of the U1 outputs a low level signal to the single chip microcomputer for judgment.
The dimming/speed regulator and the switching method of the phase-cut mode thereof can improve the compatibility of loads, match more load types in the market, including inductive loads (such as a motor), capacitive loads (such as an LED lamp, a fluorescent lamp and the like) and resistive loads (such as an incandescent lamp), and effectively protect MOS (metal oxide semiconductor) tubes in a circuit from being damaged due to overhigh voltage. The reliability of the product is improved.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the scope of the disclosed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (11)
1. A light/speed regulator is connected between a live wire and a load of an alternating current power supply and is connected with a zero line of the alternating current power supply through the load; the dimming/speed regulator comprises a switching tube, an MCU circuit and an AD/DC conversion circuit; the switching tube is connected between a live wire of an alternating current power supply and a load; the input of the AD/DC conversion circuit is connected with an alternating current power supply, and the output of the AD/DC conversion circuit is connected to the power supply end of the MCU circuit; the output of the MCU circuit is connected to the switching tube; the method is characterized in that: the input end of the load detection circuit is connected with the two ends of the switch tube so as to realize the detection of the voltage at the two ends of the switch tube; the output end of the load detection circuit is connected with the input end of the MCU circuit, the MCU circuit judges the type of the load through the voltage at two ends of the switch tube obtained by the load detection circuit, and switches the working mode of the light/speed regulator by outputting a control signal to the switch tube.
2. The dimmer/governor of claim 1, wherein: furthermore, the dimming/speed regulator further comprises a first voltage detection circuit and a second voltage detection circuit, wherein the input end of the first voltage detection circuit is connected with the live wire of the alternating current power supply, and the output end of the first voltage detection circuit is connected to the input of the MCU circuit; the input end of the second voltage detection circuit is connected with the output end of the AD/DC conversion circuit, and the output end of the second voltage detection circuit is connected to the input end of the MCU circuit.
3. The dimmer/governor of claim 2, wherein: the MCU circuit acquires voltage value signals of the input end and the output end of the AD/DC conversion circuit through the first voltage detection circuit and the second voltage detection circuit, detects whether the working voltage of the dimming/speed regulator is in a normal range through analyzing and judging the voltage value signals, and outputs a control signal to the switch tube to switch the working mode of the dimming/speed regulator if the working voltage of the dimming/speed regulator is not in a normal range.
4. The dimmer/governor of claim 1 or 2 or 3, wherein: furthermore, the light/speed regulator also comprises an externally-arranged switch detection circuit, the input of the externally-arranged switch detection circuit is connected with an externally-arranged switch, and the output end of the externally-arranged switch detection circuit is connected to the input of the MCU circuit; the MCU circuit obtains the on or off state of the external switch through the external switch detection circuit and controls the on and off of the switch tube by outputting a control signal to the switch tube.
5. The dimmer/governor of claim 1, wherein: the load detection circuit consists of a third resistor, a fourth resistor, a fifth resistor and a bipolar TVS transient suppression diode; one end of the third resistor is connected to a live wire of an alternating current power supply, the other end of the third resistor is connected with one end of the bipolar TVS transient suppression diode, and the other end of the bipolar TVS transient suppression diode is grounded; one end of the fourth resistor is connected to one end of the bipolar TVS transient suppression diode, and the other end of the fourth resistor is connected to the input of the MCU circuit; one end of the fifth resistor is connected to the other end of the fourth resistor, and the other end of the fifth resistor is grounded.
6. The dimmer/governor of claim 1, wherein: the load detection circuit consists of a sixth diode, an eighth resistor, a ninth resistor, an eleventh resistor, a second voltage regulator tube, a fourth capacitor and an optical coupler; the anode of the sixth diode is connected with the live wire of the alternating current power supply, the cathode of the sixth diode is connected with one end of the eighth resistor, the other end of the eighth resistor is connected with one end of the ninth resistor, the other end of the ninth resistor is connected with a load, one end of the second voltage-stabilizing tube is connected with the other end of the eighth resistor, the other end of the second voltage-stabilizing tube is connected with the first pin of the optical coupler, the fourth capacitor is connected between the first pin and the second pin of the optical coupler, the second pin of the optical coupler is connected to the other end of the ninth resistor, the third pin of the optical coupler is grounded, and the fourth pin of the optical coupler is connected to the input end of the MCU circuit; the eleventh resistor is connected between the output end of the AD/DC conversion circuit and the fourth pin of the optical coupler.
7. The dimmer/governor of claim 2 or 3, wherein: the first voltage detection circuit consists of a first resistor, a second resistor, a tenth resistor and a first voltage regulator tube; one end of the first resistor is connected to a live wire of the alternating current power supply, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to the input end of the MCU circuit; one end of the first voltage-regulator tube is connected to the other end of the second resistor, the other end of the first voltage-regulator tube is grounded, one end of the tenth resistor is connected to the other end of the second resistor, and the other end of the tenth resistor is grounded.
8. The dimmer/governor of claim 7, wherein: the second voltage detection circuit consists of a sixth resistor, a seventh resistor and a second capacitor; one end of the sixth resistor is connected to the output end of the AD/DC conversion circuit, the other end of the sixth resistor is connected to one end of the seventh resistor, and the other end of the seventh resistor is grounded; the other end of the sixth resistor is connected to the input end of the MCU circuit; and two ends of the second capacitor are respectively connected with two ends of the seventh resistor.
9. A method for switching phase-cut modes of a light/speed regulator is characterized in that: the method comprises the following steps:
presetting a phase-cutting mode of the light/speed regulator in a post-phase-cutting mode;
the load detection circuit is used for detecting the voltage at the two ends of the switch tube and outputting the voltage to the MCU for analysis and judgment, when the voltage waveforms at the two ends of the switch tube are in a standard back phase-cut mode, the MCU judges that the load connected with the light/speed regulator is a capacitive load or a resistive load, when the voltage waveforms at the two ends of the switch tube are in a back phase-cut mode state, a reverse electromotive voltage is superposed at the two ends of the switch tube, and the reverse electromotive voltage is generated at the two ends of the switch tube when the switch tube is switched off, the MCU judges that the load connected with the light/speed regulator is an inductive load;
when the MCU judges that the load connected with the dimming/speed regulator is an inductive load, the MCU sends a signal to the switching tube, the dimming/speed regulator is switched from a back phase-cutting mode to a front phase-cutting mode, and the switching tube is switched off and arranged at a position close to a zero crossing point or a zero crossing point, so that the generated back electromotive force is reduced to the minimum and is superposed at a zero voltage position, and the switching tube works in a normal working voltage range.
10. The method of switching the phase-cut mode of a dimmer/governor of claim 9, wherein: further, when the dimmer works in a single live wire state, the voltage detection circuit is used for detecting the voltages of the input end and the output end of the AD/DC conversion circuit and judging whether the voltages are in a normal power supply range, if the voltages are lower than the voltage of the normal power supply, the conduction time ton of the switching tube is correspondingly reduced, the voltages at two ends of the maximum conduction time are locked in the normal working range, if the voltages are reduced to the lowest set value and cannot work in the normal working range, the load type is judged to be incompatible with the working module at the current stage, and the working mode is automatically switched to the front cut or the back cut.
11. The method of switching the phase-cut mode of a dimmer/governor of claim 10, wherein: furthermore, a voltage detection circuit is used for detecting the voltage of the output end of the AD/DC conversion circuit, when the power supply of the dimmer is just switched on and the voltage of the output end of the AD/DC conversion circuit is not stabilized in the normal working voltage range of the switching tube, the MCU outputs a control signal to the switching tube to control the switching tube to be switched off and then switched on after a period of time delay.
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