CN111090016A - Silicon controlled rectifier dimmer detection device, circuit and detection method thereof - Google Patents
Silicon controlled rectifier dimmer detection device, circuit and detection method thereof Download PDFInfo
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- CN111090016A CN111090016A CN201911330119.4A CN201911330119A CN111090016A CN 111090016 A CN111090016 A CN 111090016A CN 201911330119 A CN201911330119 A CN 201911330119A CN 111090016 A CN111090016 A CN 111090016A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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Abstract
The invention discloses a detection device, a detection circuit and a detection method for a silicon controlled rectifier dimmer, wherein the detection circuit for the silicon controlled rectifier dimmer comprises a rectifier bridge, a discharge module, a detection module and a load; the rectifier bridge outputs line voltage to the bleeder module and the load; the discharge module outputs a sampling signal to the detection module according to the line voltage and provides discharge current for the silicon controlled rectifier dimmer when the silicon controlled rectifier dimmer is arranged in the line network; the detection module controls the discharge module to be turned off when the detection module determines that the silicon controlled rectifier dimmer is not arranged in the wire mesh according to the sampling signal and the preset signal, and controls the discharge module to be continuously turned on when the silicon controlled rectifier dimmer is arranged in the wire mesh, the voltage of the sampling signal is constant when the online voltage is greater than the starting voltage of the discharge module, and the online voltage is reduced along with the line voltage when the online voltage is less than the starting voltage, so that the existence of the silicon controlled rectifier dimmer is detected, and the purpose of saving energy consumption is achieved; meanwhile, the detection result can be effectively prevented from being influenced by the fluctuation of the wire network, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of LED (light emitting diode) lighting, in particular to a silicon controlled rectifier dimmer detection device, a silicon controlled rectifier dimmer detection circuit and a silicon controlled rectifier dimmer detection method.
Background
With the popularization of LED lighting, LED lamps gradually replace incandescent lamps, some of which have a thyristor dimmer for adjusting the brightness of the incandescent lamps, and some of which have no thyristor dimmer. When the thyristor dimmer is available, the LED lamp needs to be additionally provided with a bleeding circuit for generating a bleeding current to maintain the normal operation of the thyristor dimmer. When no thyristor dimmer exists, if the leakage current in the leakage circuit still exists, the efficiency of the lamp can be reduced, and unnecessary energy loss is increased. This requires a triac dimmer detection circuit for detecting whether or not the triac dimmer is connected to the power consumption environment, and turning on or off the drain current according to the detection result.
In the traditional detection method of the silicon controlled rectifier dimmer, a voltage dividing resistor is used for sampling the line voltage output by a rectifier bridge, and whether the silicon controlled dimmer exists in a line network or not is judged by calculating a sampling result, but the following problems exist in the existing detection method: firstly, a PCB used by an LED lamp panel is a single-layer board, and the divider resistor causes high cost and difficult PCB wiring; secondly, due to the high-voltage power utilization environment and power consumption, the divider resistor has a large value, and a large resistance value and high voltage are not easy to integrate with a chip; thirdly, a PAD is required to be added on the chip to be connected with the voltage dividing resistor, so that the cost is increased, and the PCB wiring is difficult; finally, along with the change of the voltage of the wire network, misjudgment is easily caused, the LED lamp is started when the leakage current is not started, energy is wasted, and the silicon controlled dimmer is not normally operated when the leakage current is not started, so that the LED lamp flickers.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a detection device, a circuit and a detection method for a silicon controlled dimmer, which can detect whether the silicon controlled dimmer exists or not, correspondingly turn on or off the leakage current and achieve the purpose of saving energy consumption; meanwhile, the detection result can be effectively prevented from being influenced by the fluctuation of the wire network; the integrated cable can be integrated, the wiring is easier, and the cost is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a detection circuit of a silicon controlled rectifier dimmer comprises a rectifier bridge, a discharge module, a detection module and a load; the rectifier bridge is used for outputting line voltage to the bleeder module and the load after rectifying the input alternating current; the discharge module is used for outputting a sampling signal to the detection module according to the line voltage and providing discharge current for the silicon controlled dimmer when the silicon controlled dimmer is arranged in the line network; the detection module is used for controlling the discharge module to be continuously conducted when the wire mesh is determined to be provided with the silicon controlled rectifier dimmer according to the sampling signal and a preset signal, and controlling the discharge module to be turned off when the wire mesh is not provided with the silicon controlled rectifier dimmer, wherein the voltage of the sampling signal is constant when the line voltage is larger than the starting voltage of the discharge module, and is reduced along with the line voltage when the line voltage is smaller than the starting voltage.
In the silicon controlled dimmer detection circuit, the detection module comprises a comparator, a timer and a judgment unit; the comparator is used for comparing the sampling signal with a reference signal and then outputting a comparison signal to the timer, and the timer is used for timing the comparison signal and then outputting a timing signal to the judging unit; the judging unit is used for determining that the line network is not provided with the silicon controlled rectifier dimmer when judging that the timing signal is greater than the preset signal, controlling the discharge module to be switched off, and determining that the line network is provided with the silicon controlled rectifier dimmer when judging that the timing signal is less than the preset signal, and controlling the discharge module to be continuously switched on.
In the silicon controlled dimmer detection circuit, the detection module comprises a comparator, a timer, a judgment unit and a filtering unit; the comparator is used for comparing the sampling signal with a reference signal and then outputting a comparison signal to the judgment unit; the filtering unit is used for filtering the comparison signal; the judging unit is used for determining that the silicon controlled rectifier dimmer is not arranged on the wire network and controlling the discharge module to be switched off when judging that the comparison signal is greater than the preset signal within the preset timing time of the timer, and determining that the silicon controlled rectifier dimmer is arranged on the wire network and controlling the discharge module to be continuously switched on when judging that the comparison signal is less than the preset signal.
In the detection circuit of the silicon controlled dimmer, the bleeder module comprises a first operational amplifier, a first MOS (metal oxide semiconductor) tube, a first resistor and a first reference voltage source; the output end of the first operational amplifier is connected with the grid electrode of the first MOS tube, the source electrode of the first MOS tube is connected with one end of the first resistor, the inverting input end of the first operational amplifier and the detection module, the positive phase input end of the first operational amplifier is connected with the positive electrode of the first reference voltage source, the other end of the first resistor is grounded with the first reference voltage source, and the drain electrode of the first MOS tube is connected with the rectifier bridge.
In the detection circuit of the silicon controlled dimmer, the load comprises an LED lamp string, a second MOS tube, a second resistor, a second operational amplifier and a second reference voltage source; the input end of the LED lamp string is connected with the rectifier bridge, the output end of the LED lamp string is connected with the drain electrode of the second MOS tube, the source electrode of the second MOS tube is connected with the inverting input end of the second operational amplifier and one end of the second resistor, and the other end of the second resistor and the negative electrode of the second reference voltage source are both grounded; and the non-inverting input end of the second operational amplifier is connected with the anode of the second reference voltage source.
In the silicon controlled dimmer detection circuit, the load comprises an LED lamp string, a first diode, a first capacitor, a second diode, a third resistor, an inductor and a constant current driving chip; the input end of the LED lamp string, one end of the second capacitor, the cathode of the second diode and one end of the first capacitor are all connected with the cathode of the first diode, and the anode of the first diode is connected with the rectifier bridge; the positive electrode of the second diode and one end of the inductor are connected with the No. 1 pin of the constant current driving chip, and the other end of the inductor is connected with the other end of the second capacitor and the negative electrode of the LED lamp string; the other end of the first capacitor and one end of the third resistor are both grounded, and the other end of the third resistor is connected with the No. 2 pin of the constant current driving chip.
In the detection circuit of the silicon controlled dimmer, the filter unit comprises a third capacitor, one end of the third capacitor is connected with the comparator and the judgment unit, and the other end of the third capacitor is grounded.
The detection method based on the silicon controlled rectifier dimmer detection circuit comprises the following steps:
the rectifier bridge rectifies the input alternating current and outputs the line voltage to the bleeder module and the load;
the discharge module outputs a sampling signal to the detection module according to the line voltage and provides a discharge current for the silicon controlled dimmer when the silicon controlled dimmer is arranged in the line network;
the detection module compares the sampling signal with a preset signal, controls the discharge module to be turned off when the fact that the silicon controlled rectifier dimmer is not arranged on the line network is determined according to a comparison result, and controls the discharge module to be continuously turned on when the fact that the silicon controlled rectifier dimmer is arranged on the line network is determined.
The utility model provides a silicon controlled rectifier dimmer detection device, includes the shell, be provided with the PCB board in the shell, its characterized in that, be provided with on the PCB board as above silicon controlled rectifier dimmer detection circuitry.
Compared with the prior art, the detection device, the detection circuit and the detection method of the silicon controlled rectifier dimmer provided by the invention have the advantages that the detection circuit of the silicon controlled rectifier dimmer comprises a rectifier bridge, a discharge module, a detection module and a load; the rectifier bridge is used for outputting line voltage to the bleeder module and the load after rectifying the input alternating current; the discharge module is used for outputting a sampling signal to the detection module according to the line voltage and providing discharge current for the silicon controlled dimmer when the silicon controlled dimmer is arranged in the line network; the detection module is used for controlling the discharge module to be turned off when the fact that the silicon controlled rectifier dimmer is not arranged on the wire mesh is determined according to the sampling signal and a preset signal, and controlling the discharge module to be continuously turned on when the fact that the silicon controlled rectifier dimmer is arranged on the wire mesh is determined, wherein the voltage of the sampling signal is constant when the line voltage is larger than the starting voltage of the discharge module, and is reduced along with the line voltage when the line voltage is smaller than the starting voltage of the discharge module, so that the existence of the silicon controlled rectifier dimmer is detected, and the purpose of saving energy consumption is achieved; meanwhile, the detection result can be effectively prevented from being influenced by the fluctuation of the wire network, and the cost is reduced.
Drawings
Fig. 1 is a block diagram of a detection circuit of a thyristor dimmer provided by the present invention;
fig. 2 is a schematic circuit diagram of a thyristor dimmer detection circuit according to a first embodiment of the present invention;
FIG. 3 is a waveform diagram of line voltage and sampling signal of a first embodiment of the SCR dimmer detection circuit provided in the present invention;
FIG. 4 is a schematic circuit diagram of a second embodiment of a SCR dimmer detection circuit according to the present invention;
FIG. 5 is a waveform diagram of a line voltage and a sampling signal of a second embodiment of the SCR dimmer detection circuit provided in the present invention;
FIG. 6 is a schematic circuit diagram of a third embodiment of a SCR dimmer detection circuit according to the present invention;
FIG. 7 is a waveform diagram of a line voltage and a sampling signal of a third embodiment of the SCR dimmer detection circuit provided in the present invention;
FIG. 8 is a schematic circuit diagram of a fourth embodiment of a SCR dimmer detection circuit according to the present invention;
fig. 9 is a schematic circuit diagram of a fifth embodiment of a triac dimmer detection circuit according to the present invention;
fig. 10 is a flowchart of a detection method of the triac dimmer detection circuit according to the present invention.
Detailed Description
The invention aims to provide a detection device, a circuit and a detection method of a silicon controlled rectifier dimmer, which can detect whether the silicon controlled rectifier dimmer exists or not, correspondingly turn on or off the discharge current and achieve the purpose of saving energy consumption; meanwhile, the detection result can be effectively prevented from being influenced by the fluctuation of the wire network; the integrated cable can be integrated, the wiring is easier, and the cost is reduced.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the detection circuit of the thyristor dimmer provided by the present invention includes a rectifier bridge 100, a bleeding module 200, a detection module 300 and a load 400, wherein an input end of the rectifier bridge 100 is connected to an ac power supply, an output end of the rectifier bridge 100 is connected to the bleeding module 200 and the load 400, and the bleeding module 200 is further connected to the detection module 300; the rectifier bridge 100 is in the prior art, and therefore details of the specific connection relationship of the rectifier bridge 100 in this embodiment are not described herein.
In specific implementation, the ac power supply outputs ac power to the rectifier bridge 100, and the rectifier bridge 100 is configured to rectify the input ac power and output line voltage to the bleeding module 200 and the load 400, so as to provide electric energy for the load 400; after power-on, the bleeding module 200 is defaulted to be on, the bleeding current is turned on, the bleeding module 200 is configured to output a sampling signal to the detection module 300 according to the line voltage, and provide the bleeding current for the triac dimmer when the triac dimmer is arranged in the line network, so as to maintain normal operation of the triac dimmer; the detection module 300 is configured to output a corresponding control signal to the drain module 200 to control the drain module 200 to be continuously turned on when it is determined that the thyristor dimmer is disposed in the line network according to the sampling signal and a preset signal, so that the drain module 200 continuously provides a drain current for the thyristor dimmer; when it is determined that the triac dimmer is not set in the wire mesh, outputting a corresponding control signal to the bleeding module 200 to control the bleeding module 200 to turn off, wherein the voltage of the sampling signal is constant when the line voltage is greater than the starting voltage of the bleeding module 300, and decreases with the line voltage when the line voltage is less than the starting voltage of the bleeding module 300; therefore, the purpose of saving energy consumption is achieved by detecting whether the silicon controlled rectifier dimmer exists or not and correspondingly turning on or off the discharge current; meanwhile, the detection result can be effectively prevented from being influenced by the fluctuation of the wire network; compared with the traditional detection technology, the detection circuit of the silicon controlled dimmer provided by the invention can be integrated, the PCB wiring is easier, and the cost is lower.
Further, referring to fig. 2, the bleeder module 200 includes a first operational amplifier OP1, a first MOS transistor Q1, a first resistor R1, and a first reference voltage source DC 1; the output end of the first operational amplifier OP1 is connected to the gate of the first MOS transistor Q1, the source of the first MOS transistor Q1 is connected to one end of the first resistor R1, the inverting input end of the first operational amplifier OP1 and the detection module 300, the non-inverting input end of the first operational amplifier OP1 is connected to the anode of the first reference voltage source DC1, the other end of the first resistor R1 and the first reference voltage source DC1 are grounded, the drain of the first MOS transistor Q1 is connected to the rectifier bridge 100, and the sampling module 200 directly obtains the sampling signal, so that the sampling resistor and the chip sampling PAD can be omitted.
Specifically, the bleeding module 200 is a constant current source, connected in series between the line voltage and the ground, and configured to generate a constant bleeding current, receive the control signal output by the detection module 300 to turn on or off the bleeding current, and output the sampling signal to the detection module 300; when the line voltage is greater than the starting voltage of the constant current source, the discharge current of the constant current source is constant, and the voltage of the sampling signal is constant; when the line voltage is smaller than the starting voltage of the constant current source, the discharge current is reduced, and the voltage of the sampling signal is reduced; when the wire mesh is connected with the silicon controlled dimmer, the duration of the leakage current is short, the voltage constant time of the sampling signal is short, when the wire mesh is not connected with the silicon controlled dimmer, the duration of the leakage current is long, and the voltage constant time of the sampling signal is long; therefore, the structure of the constant current source and the constant current resistor of the discharge module 200 is utilized to generate a sampling signal, the duration of the discharge current in one or more line voltage periods is obtained by detecting the sampling signal, and whether the silicon controlled rectifier dimmer is connected to a line network can be accurately judged by the duration of the current.
Further, with continuing reference to fig. 2, in the first embodiment of the present invention, the detecting module 300 includes a comparator OP3, a timer and a determining unit; the comparator OP3 is configured to compare the sampling signal with a reference signal and output a comparison signal to the timer, and the timer is configured to time the comparison signal and output a timing signal to the determining unit; the judging unit is used for judging that the timing signal is greater than when presetting the signal, then confirm the gauze does not set up the silicon controlled rectifier dimmer, control the module 200 of bleeding turns off, need not for the silicon controlled rectifier dimmer provides the bleeder current, when judging that the timing signal is less than when presetting the signal, then confirm the gauze is provided with the silicon controlled rectifier dimmer controls the module 200 of bleeding continuously switches on, for the silicon controlled rectifier dimmer provides the bleeder current.
In this embodiment, the sampling signal is a voltage value of the sampling signal, and the reference signal is a preset voltage Vref 3; the timing signal is the duration of the comparison signal, and the preset signal is a set duration T; after power-on, the comparator OP3 compares the voltage value of the sampling signal with the preset voltage Vref3 and outputs the voltage value to a timer, the timer counts the high-level duration of the comparison signal and outputs the currently-timed duration to the judging unit, the judging unit compares the duration with the set duration T, and then a control signal is obtained, stored and output to the discharging module 200 to control the on or off of the discharging current.
Further, referring to fig. 3, when the triac dimmer is present in the network, the commercial power is cut off in a partial phase, and compared with the time when the triac dimmer is absent, the duration T1 of the sampling signal is smaller than the duration T2 of the sampling signal when the triac dimmer is absent, and by setting the duration T in advance, T1< T2, whether the network is connected to the triac dimmer can be accurately detected; specifically, when the duration Tx > T currently detected is greater than T, it represents that the triac dimmer is not present in the net, and a control signal is output to the bleeding module 200 to control the bleeding module to turn off; when the currently detected duration Tx is less than T, it represents that the thyristor dimmer is in the net, and outputs a control signal to the bleeding module 200 to control the thyristor dimmer to be continuously turned on and continuously provide a bleeding current for the thyristor dimmer, thereby realizing the detection of the existence of the thyristor dimmer and the corresponding turning on or off of the bleeding current, and achieving the purpose of saving energy consumption; wherein the duration T1 of the sampling signal represents the duration of the bleed current within one line voltage period.
It should be noted that the duration of the bleed current in one line voltage period after power-on may also be calculated to make the determination, the average duration after the duration of the bleed current in a plurality of line voltage periods may also be calculated to make the determination, and certainly, the duration of the bleed current in a period after power-on may also be calculated to make the determination, which is not specifically set in this embodiment. In this embodiment, the sampling signal varies with the line voltage period, the comparison signal output by the comparator OP3 also varies with the line voltage period, and the duration of the timer for timing the high level and the duration of the timer for timing the low level are equivalent, and the presence or absence of the triac dimmer can be detected.
Further, with reference to fig. 2, in the present embodiment, the load 400 includes an LED string, a second MOS transistor Q2, a second resistor R2, a second operational amplifier OP2, and a second reference voltage source DC 2; the input end of the LED light string is connected to the rectifier bridge 100, the output end of the LED light string is connected to the drain of the second MOS transistor Q2, the source of the second MOS transistor Q2 is connected to the inverting input end of the second operational amplifier OP2 and one end of the second resistor R2, and the other end of the second resistor R2 and the negative electrode of the second reference voltage source DC2 are both grounded; the non-inverting input end of the second operational amplifier OP2 is connected to the anode of the second reference voltage source DC2, wherein the voltage of the LED string is determined by the user according to the electricity environment, and the string voltage can be 240V-260V in 220V AC application.
Further, referring to fig. 4, in the second embodiment of the present invention, the detecting module 300 includes a comparator OP3, a timer, a determining unit and a filtering unit; the comparator OP3 is configured to compare the sampling signal with a reference signal and output a comparison signal to the determining unit; the filtering unit is used for filtering the comparison signal; the judging unit is used for determining that the wire mesh is not provided with the silicon controlled rectifier dimmer within the preset time of the timer when judging that the comparison signal is greater than the preset signal, controlling the discharge module 200 to be switched off, and determining that the wire mesh is provided with the silicon controlled rectifier dimmer when judging that the comparison signal voltage is less than the preset signal, controlling the discharge module 200 to be continuously switched on and providing discharge current for the silicon controlled rectifier dimmer.
In this embodiment, the comparison signal is an average voltage, the preset signal is a set voltage U, and the reference signal is a preset voltage Vref 3; after the power is turned on, the timer starts timing, the comparator OP3 compares the voltage value of the sampling signal with the preset voltage Vref3 and outputs the voltage value, the average voltage is filtered by the filtering unit and then output to the judging unit, and the judging unit compares the average voltage with the set voltage U within the preset timing time of the timer, so as to obtain a control signal, store the control signal and output the control signal to the bleeding module 200 to control the on or off of the bleeding current.
Further, referring to fig. 4, in the present embodiment, the filtering unit includes a third capacitor C3, one end of the third capacitor C3 is connected to the comparator OP3 and the determining unit, the other end of the third capacitor C3 is grounded, and the average voltage is filtered by the third capacitor C3, so as to achieve a stable comparison signal.
Further, referring to fig. 5, when the triac dimmer is present in the net, the commercial power is cut off in a partial phase, and compared with the case of no triac dimmer, the average voltage U1 output by the comparator OP3 is lower than the average voltage U2 output by the comparator OP3 when no triac dimmer is present, so that U1< U2 through the set voltage U, whether the net is connected to the triac dimmer can be accurately detected. Specifically, when the currently detected average voltage Ux > U, it represents that the triac dimmer is not present in the net, and the determining unit outputs a control signal to the bleeding module 200 to control the bleeding module to turn off; when the currently detected average voltage Ux is less than U, the presence of the thyristor dimmer in the net is represented, and the judgment unit outputs a control signal to the discharge module 200 to control the continuous conduction of the thyristor dimmer, so as to continuously provide the discharge current for the thyristor dimmer, thereby realizing the detection of the presence of the thyristor dimmer, correspondingly turning on or off the discharge current, and achieving the purpose of saving energy consumption.
Further, referring to fig. 6, in a third embodiment of the present invention, one end of a second resistor R2 in the load 400 is connected to the bleeder module 200, the detection module 300 and the source of the second MOS transistor Q2, and the other end of the second resistor R2 is grounded; the difference compared to the first embodiment is that the bleeder module 200 is connected to ground via the second resistor R2 in this embodiment, so that the bleeder module 200 and the load 400 are connected in series.
Specifically, in this embodiment, when the line voltage is lower than the voltage of the LED light string, the bleeding current flows through the bleeding module 200, the load 400 does not have current, and the detecting module 300 detects the duration time of the bleeding current to determine whether the scr dimmer is connected; when the line voltage is equal to or higher than the voltage of the LED string, the bleeding current of the bleeding module 200 is turned off, and the load 400 current is turned on, on one hand, the load 400 current acts as the bleeding current to maintain the normal operation of the scr dimmer, and on the other hand, the load 400 current is used to light the LED string. Compared with the first embodiment, in an application scenario with the triac dimmer, the duration of the bleeding current of the bleeding module 200 is short, and the power conversion efficiency is higher.
Further, referring to fig. 7, when the triac dimmer is not installed in the wire mesh, and the line voltage is lower than the voltage of the LED light string, the drain current holding time is divided into two symmetrical parts in one period of the line voltage, which correspond to the rising and falling of the line voltage, respectively; when the triac dimmer is arranged in the wire mesh, the line voltage rises and is partially completely phase-cut less than the voltage of the LED string, the duration T1 of the drain current of the drain module 200 is 0, the line voltage drops and is less than the voltage of the LED string, and the duration T2 of the drain current is the same as the duration T1 without the triac dimmer, that is, T1 is T2. By setting the set time length T, when the line voltage rises, T1< T < T2 can accurately detect whether the wire net is connected with the silicon controlled rectifier dimmer. Specifically, when the duration Tx > T of the current detection indicates that the triac dimmer is not present in the wire mesh, the determining unit outputs a control signal to the bleeding module 200 to control the bleeding module 200 to turn off; when the duration Tx < T of the current detection indicates that the triac dimmer is in the wire network, the determining unit outputs a control signal to the bleeding module 200 to control the bleeding module to continuously output the bleeding current, so as to detect the presence or absence of the triac dimmer.
It should be noted that the duration of the current when the voltage rises in one period of the line voltage after being powered on may be calculated to make the determination, the duration of the current when the voltage rises in a plurality of periods of the line voltage may be calculated and then the average duration may be calculated to make the determination, and certainly, the duration of the current in a period of time after being powered on may also be calculated to make the determination, which is not specifically set in this embodiment. Of course, the time without current can be calculated to make the judgment through an equivalent principle.
Further, referring to fig. 8, in a fourth embodiment of the present invention, the load 400 includes an LED string, a first diode D1, a first capacitor C1, a second capacitor C2, a second diode D2, a third resistor R3, an inductor L1, and a constant current driving chip U1; the input end of the LED lamp string, one end of the second capacitor C2, the cathode of the second diode D2 and one end of the first capacitor C1 are all connected with the cathode of the first diode D1, and the anode of the first diode D1 is connected with the rectifier bridge 100; the positive electrode of the second diode D2 and one end of the inductor L1 are connected to the 1 st pin of the constant current driving chip U1, and the other end of the inductor L1 is connected to the other end of the second capacitor C2 and the negative electrode of the LED light string; the other end of the first capacitor C1 and one end of the third resistor R3 are both grounded, and the other end of the third resistor R3 is connected to the 2 nd pin of the constant current driving chip U1; the detection principle of the thyristor dimmer in this embodiment is the same as that of the first embodiment, and the detection principle of the first embodiment is described in detail above, so that the details are not repeated herein.
The difference between this embodiment and the first embodiment is that the load 400 uses a BUCK switching power supply whose topology is BUCK, the first diode D1 is an isolation diode for isolating the bleeder module 200 from pulling up current from the first capacitor C1, the second diode D2 is a fast recovery diode, the first capacitor C1 and the second capacitor C2 are high-voltage electrolytic filter capacitors, and the model of the constant current driving chip U1 is BP 2865S.
Further, referring to fig. 9, in a fifth embodiment of the present invention, the detecting module 300 includes a timer and a determining unit; the timer is used for outputting a timing signal to the judging unit after timing the sampling signal; the judging unit is used for determining that the silicon controlled rectifier dimmer is not arranged on the line network and controlling the discharge module 200 to be switched off when the judging unit judges that the timing signal is greater than the preset signal; when the timing signal is smaller than the preset signal, it is determined that the wire mesh is provided with the thyristor dimmer, and the drain module 200 is controlled to be continuously conducted, and compared with the first embodiment, the sampling signal can be directly timed to obtain the timing signal in the invention, a comparator and a corresponding reference voltage source are not required to be designed, and then the preset signal is combined to judge whether the thyristor dimmer exists, and the drain current is correspondingly turned on or off, so that the purpose of saving energy consumption is achieved.
Correspondingly, the present invention further provides a detection method of the detection circuit of the triac dimmer, as shown in fig. 10, which includes the following steps:
s100, the rectifier bridge rectifies input alternating current and outputs line voltage to the bleeder module and a load;
s200, the discharge module outputs a sampling signal to the detection module according to the line voltage and provides a discharge current for the silicon controlled dimmer when the silicon controlled dimmer is arranged in the line network;
s300, the detection module controls the discharge module to be turned off when the silicon controlled dimmer is not arranged in the wire network according to the sampling signal and the preset signal, and controls the discharge module to be continuously conducted when the silicon controlled dimmer is arranged in the wire network.
The invention also correspondingly provides a silicon controlled dimmer detection device, which comprises a shell, wherein a PCB is arranged in the shell, the PCB is provided with the silicon controlled dimmer detection circuit, and the silicon controlled dimmer detection circuit is described in detail above and is not further detailed here.
In summary, the invention provides a detection device, a detection circuit and a detection method for a silicon controlled dimmer, wherein the detection circuit for the silicon controlled dimmer comprises a rectifier bridge, a bleed-off module, a detection module and a load; the rectifier bridge is used for outputting line voltage to the bleeder module and the load after rectifying the input alternating current; the discharge module is used for outputting a sampling signal to the detection module according to the line voltage and providing discharge current for the silicon controlled dimmer when the silicon controlled dimmer is arranged in the line network; the detection module is used for controlling the discharge module to be turned off when the wire mesh is determined to be not provided with the silicon controlled dimmer according to the sampling signal and a preset signal, and controlling the discharge module to be continuously turned on when the wire mesh is provided with the silicon controlled dimmer, wherein the voltage of the sampling signal is constant when the line voltage is greater than the starting voltage of the discharge module, and is reduced along with the line voltage when the line voltage is less than the starting voltage of the discharge module, so that the existence of the silicon controlled dimmer is detected, and the purpose of saving energy consumption is achieved; meanwhile, the detection result can be effectively prevented from being influenced by the fluctuation of the wire network, and the cost is reduced.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. The detection circuit of the silicon controlled rectifier dimmer is characterized by comprising a rectifier bridge, a bleeder module, a detection module and a load; the rectifier bridge is used for outputting line voltage to the bleeder module and the load after rectifying the input alternating current; the discharge module is used for outputting a sampling signal to the detection module according to the line voltage and providing discharge current for the silicon controlled dimmer when the silicon controlled dimmer is arranged in the line network; the detection module is used for controlling the discharge module to be continuously conducted when the fact that the silicon controlled dimmer is arranged on the line network is determined according to the sampling signal and a preset signal, and controlling the discharge module to be turned off when the fact that the silicon controlled dimmer is not arranged on the line network is determined; the voltage of the sampling signal is constant when the line voltage is greater than the starting voltage of the bleeding module and decreases with the line voltage when the line voltage is less than the starting voltage of the bleeding module.
2. The triac dimmer detection circuit of claim 1, wherein said detection module comprises a comparator, a timer, and a determination unit; the comparator is used for comparing the sampling signal with a reference signal and then outputting a comparison signal to the timer, and the timer is used for timing the comparison signal and then outputting a timing signal to the judging unit; the judging unit is used for determining that the line network is not provided with the silicon controlled rectifier dimmer when judging that the timing signal is greater than the preset signal, controlling the discharge module to be switched off, and determining that the line network is provided with the silicon controlled rectifier dimmer when judging that the timing signal is less than the preset signal, and controlling the discharge module to be continuously switched on.
3. The scr dimmer detection circuit of claim 1, wherein the detection module comprises a comparator, a timer, a determination unit, and a filtering unit; the comparator is used for comparing the sampling signal with a reference signal and then outputting a comparison signal to the judgment unit; the filtering unit is used for filtering the comparison signal; the judging unit is used for determining that the silicon controlled rectifier dimmer is not arranged on the wire network and controlling the discharge module to be switched off when judging that the comparison signal is greater than the preset signal within the preset timing time of the timer, and determining that the silicon controlled rectifier dimmer is arranged on the wire network and controlling the discharge module to be continuously switched on when judging that the comparison signal is less than the preset signal.
4. The triac dimmer detection circuit of claim 1, wherein said detection module comprises a timer and a determination unit; the timer is used for outputting a timing signal to the judging unit after timing the sampling signal; the judging unit is used for determining that the silicon controlled rectifier dimmer is not arranged on the line network and controlling the discharge module to be switched off when the judging unit judges that the timing signal is greater than the preset signal; and when the timing signal is judged to be smaller than the preset signal, determining that the line network is provided with a silicon controlled rectifier dimmer, and controlling the discharge module to be continuously conducted.
5. The triac dimmer detection circuit of claim 1, wherein the bleeding module comprises a first operational amplifier, a first MOS transistor, a first resistor, and a first reference voltage source; the output end of the first operational amplifier is connected with the grid electrode of the first MOS tube, the source electrode of the first MOS tube is connected with one end of the first resistor, the inverting input end of the first operational amplifier and the detection module, the positive phase input end of the first operational amplifier is connected with the positive electrode of the first reference voltage source, the other end of the first resistor is grounded with the first reference voltage source, and the drain electrode of the first MOS tube is connected with the rectifier bridge.
6. The scr dimmer detection circuit of claim 1, wherein the load comprises an LED string, a second MOS transistor, a second resistor, a second operational amplifier, and a second reference voltage source; the input end of the LED lamp string is connected with the rectifier bridge, the output end of the LED lamp string is connected with the drain electrode of the second MOS tube, the source electrode of the second MOS tube is connected with the inverting input end of the second operational amplifier and one end of the second resistor, and the other end of the second resistor and the negative electrode of the second reference voltage source are both grounded; and the non-inverting input end of the second operational amplifier is connected with the anode of the second reference voltage source.
7. The scr dimmer detection circuit of claim 1, wherein the load comprises an LED string, a first diode, a first capacitor, a second diode, a third resistor, an inductor, and a constant current driver chip; the input end of the LED lamp string, one end of the second capacitor, the cathode of the second diode and one end of the first capacitor are all connected with the cathode of the first diode, and the anode of the first diode is connected with the rectifier bridge; the positive electrode of the second diode and one end of the inductor are connected with the No. 1 pin of the constant current driving chip, and the other end of the inductor is connected with the other end of the second capacitor and the negative electrode of the LED lamp string; the other end of the first capacitor and one end of the third resistor are both grounded, and the other end of the third resistor is connected with the No. 2 pin of the constant current driving chip.
8. The scr dimmer detection circuit of claim 3, wherein the filtering unit comprises a third capacitor, one end of the third capacitor is connected to the comparator and the determining unit, and the other end of the third capacitor is grounded.
9. A method for testing a triac dimmer test circuit as defined in any one of claims 1-8, comprising the steps of:
the rectifier bridge rectifies the input alternating current and outputs the line voltage to the bleeder module and the load;
the discharge module outputs a sampling signal to the detection module according to the line voltage and provides a discharge current for the silicon controlled dimmer when the silicon controlled dimmer is arranged in the line network;
the detection module controls the discharge module to be turned off when the detection module determines that the silicon controlled rectifier dimmer is not arranged on the line network according to the sampling signal and the preset signal, and controls the discharge module to be continuously turned on when the detection module determines that the silicon controlled rectifier dimmer is arranged on the line network.
10. A thyristor dimmer detection device, comprising a housing, wherein a PCB is disposed in the housing, wherein the PCB is provided with a thyristor dimmer detection circuit according to any one of claims 1 to 8.
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