CN114421935A - High-voltage alternating-current chopping sampling circuit, regulation and control method and device - Google Patents
High-voltage alternating-current chopping sampling circuit, regulation and control method and device Download PDFInfo
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- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
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- H03K7/00—Modulating pulses with a continuously-variable modulating signal
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
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- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
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Abstract
The invention discloses a high-voltage alternating-current chopping sampling circuit, a regulation and control method and a device, wherein the circuit comprises: the input filtering module, the current-limiting switching module, the pulse width modulation module and the low-pass filtering module; the input filtering module is used for carrying out rectification filtering processing on the input voltage; the current-limiting switching module is used for switching and matching different input voltages and performing current-limiting processing on the filtering voltage output by the input filtering module; the pulse width modulation module is used for performing reverse phase shaping processing on the current-limiting voltage output by the current-limiting switching module; and the low-pass filtering module is used for performing low-pass filtering processing on the in-phase voltage output by the pulse width modulation module. The invention switches and adjusts different working voltages to adapt to different loads through the current-limiting switching circuit, and adjusts different load types through the pulse width modulation circuit, thereby reducing the difficulty of regulation and control and improving the stability and the anti-interference capability of output voltage under the condition of simplifying the circuit.
Description
Technical Field
The invention relates to the technical field of sampling circuits, in particular to a high-voltage alternating-current chopping sampling circuit, a regulation and control method and a regulation and control device.
Background
With the development of electronic technology, more and more electronic devices and electronic products are released on the market for citizens to use, wherein one common electronic device is an LED lamp. Because the LED lamp has high sealing performance and shock resistance, and can directly emit red, yellow, blue, green, cyan, orange, violet, and white light, the LED lamp has become a common light emitting device.
In order to meet the illumination use requirements of users, dimming setting needs to be carried out on the users before the users use the system. The current common dimming device is a silicon controlled rectifier controller, and the voltage of an integrated circuit of the LED lamp is regulated through the silicon controlled rectifier controller, so that the conduction angle of alternating current output voltage is changed, the average voltage effective value of alternating current output is changed, loads such as the LED lamp and the like can directly utilize the average voltage effective value to adjust the size of the received power, and the purpose of dimming is achieved.
However, the conventional thyristor controller has the following technical problems: firstly, the voltage modulated by the silicon controlled controller is only suitable for pure resistance load and load with working voltage matched with commercial power, and is difficult to adapt capacitive load, inductive load or low-voltage working load, if a capacitive, emotional or low-voltage allocation circuit is added at the output end of the silicon controlled controller, because the electric signal is subjected to multiple processing, once the circuit is interfered, the output voltage is easy to change, the stability of the voltage is reduced, the regulation and control difficulty is increased, and the difficulty and the cost of an integrated circuit can be increased by increasing the configuration circuit, so that the silicon controlled controller is not suitable for popularization and use.
Disclosure of Invention
The invention provides a high-voltage alternating-current chopping sampling circuit, a regulation and control method and a device.
A first aspect of an embodiment of the present invention provides a high-voltage ac chopper sampling circuit, including: the input filtering module, the current-limiting switching module, the pulse width modulation module and the low-pass filtering module;
the input filtering module, the current-limiting switching module, the pulse width modulation module and the low-pass filtering module are sequentially connected;
the input filtering module is used for carrying out rectification filtering processing on the input voltage;
the current-limiting switching module is used for switching and matching different input voltages and performing current-limiting processing on the filtering voltage output by the input filtering module;
the pulse width modulation module is used for performing reverse phase shaping processing on the current-limiting voltage output by the current-limiting switching module;
and the low-pass filtering module is used for performing low-pass filtering processing on the in-phase voltage output by the pulse width modulation module.
In a possible implementation manner of the first aspect, the current limiting switching module includes: the device comprises a selector switch, a first switching resistor, a second switching resistor, a voltage stabilizing diode, a switching filter capacitor and a current limiting resistor;
wherein, change over switch's one end with current-limiting switch module's input is connected, change over switch's the other end respectively with the one end of first switched resistor or the one end of second switched resistor is connected, the other end of first switched resistor or the other end of second switched resistor respectively with zener diode's negative pole end, switch filter capacitor's one end with current-limiting resistor's one end is connected, zener diode's positive terminal with switch filter capacitor's the other end is connected with the earthing terminal, current-limiting resistor's the other end with current-limiting switch module's output is connected, switch filter capacitor with current-limiting resistor's link is equipped with pulse width debugging input port for input pulse width debugging signal.
In a possible implementation manner of the first aspect, the pulse width modulation module includes: the device comprises a photoelectric coupler, a first modulation resistor, a second modulation resistor, a modulation capacitor and an NMOS (N-channel metal oxide semiconductor) tube;
the positive pole end of the emitter of the photoelectric coupler is connected with the input end of the pulse width modulation module, the negative pole end of the emitter of the photoelectric coupler and the extreme end of the receiving E of the photoelectric coupler are respectively connected with the grounding end, the receiving C pole terminal of the photoelectric coupler is respectively connected with one end of the first modulation resistor, one end of the modulation capacitor and the grid terminal of the NMOS tube, the other end of the modulation capacitor and the source end of the NMOS tube are respectively connected with a grounding end, the drain end of the NMOS tube is connected with one end of the second modulation resistor, the other end of the first modulation resistor and the other end of the second modulation resistor are respectively connected with a power supply end, the connecting end of the NMOS tube and the second modulation resistor is connected with the output end of the pulse width modulation module, and the output end of the pulse width modulation module is provided with a pulse width sampling port for collecting pulse width time.
In a possible implementation manner of the first aspect, the low-pass filtering module includes: the constant current source, the first low-pass filter resistor, the second low-pass filter resistor, the third low-pass filter resistor, the first low-pass filter capacitor and the second low-pass filter capacitor;
the switch input end of the constant current source is connected with the input end of the low-pass filtering module, the voltage input end of the constant current source is connected with the power supply end, the voltage output end of the constant current source is respectively connected with one end of the first low-pass filter resistor and one end of the second low-pass filter resistor, the other end of the second low-pass filter resistor is respectively connected with one end of the third low-pass filter resistor and one end of the first low-pass filter capacitor, the other end of the third low-pass filter resistor is connected with one end of the second low-pass filter capacitor, the other end of the first low-pass filter resistor, the other end of the first low-pass filter capacitor and the other end of the second low-pass filter capacitor are respectively connected with a grounding terminal, and a voltage sampling port is arranged at the connecting end of the third low-pass filter resistor and the second low-pass filter capacitor and is used for collecting average voltage.
In a possible implementation manner of the first aspect, the input filtering module includes: the input filter resistor, the rectifier bridge stack and the input filter capacitor;
the first end and the second end of the rectifier bridge stack are respectively connected with the input end of the input filter module and used for receiving alternating current chopping, the third end of the rectifier bridge stack is connected with one end of the input filter resistor, the other end of the input filter resistor is connected with one end of the input filter capacitor, the fourth end of the rectifier bridge stack and the other end of the input filter capacitor are respectively connected with the ground terminal, and the connecting end of the input filter resistor and the input filter capacitor is connected with the output end of the input filter module.
A second aspect of the embodiments of the present invention provides a method for regulating and controlling a high-voltage ac chopper sampling circuit, where the method includes:
after pulse width modulation signals are input into the high-voltage alternating-current chopping sampling circuit, acquiring and adjusting time error parameters from the high-voltage alternating-current chopping sampling circuit;
after the high-voltage alternating-current chopping sampling circuit is input with high-voltage alternating-current chopping voltage, real-time parameters are collected from the high-voltage alternating-current chopping sampling circuit, wherein the real-time parameters comprise: a real-time pulse width time parameter and a real-time average voltage parameter;
and carrying out operation analysis on the adjustment time error parameter, the real-time pulse width time parameter and the real-time average voltage parameter to obtain a pulse width modulation signal.
In a possible implementation manner of the second aspect, the operation analysis includes:
searching an error time value corresponding to the level value in the adjustment time error parameter according to the level value of the real-time average voltage parameter;
calculating a modulation time difference value between a pulse width time value corresponding to the real-time pulse width time parameter and the error time value;
and generating a pulse width modulation signal based on the modulation time difference adjustment.
In a possible implementation manner of the second aspect, the generating a pulse width modulation signal based on the time difference adjustment includes:
if the time difference value is smaller than a preset difference value, generating a pulse width modulation signal by taking the level value of the real-time average voltage parameter as the duty ratio time, and recording an effective pulse width time value and an effective average level value corresponding to the generated pulse width modulation signal;
if the time difference is larger than a preset difference, determining the real-time change trend of the circuit in the current time node;
if the change trend is that the change directions are the same, generating a pulse width modulation signal by taking the level value of the real-time average voltage parameter as the duty ratio time, and recording an effective pulse width time value and an effective average level value corresponding to the generated pulse width modulation signal;
and if the change trend is that the change directions are different, taking the historical pulse width modulation signal generated by the previous time node as the pulse width modulation signal.
In a possible implementation manner of the second aspect, the determining a real-time variation trend of the circuit in the current time node includes:
respectively acquiring a historical time parameter and a historical voltage parameter, wherein the historical time parameter is a time value corresponding to a previous time node, and the historical voltage parameter is a voltage value corresponding to the previous time node;
calculating a comparison time difference value between the real-time pulse width time parameter and the historical time parameter, and calculating a comparison voltage difference value between the real-time average voltage parameter and the historical voltage parameter;
when the comparison time difference value and the comparison voltage difference value are both larger than zero, or the comparison time difference value and the comparison voltage difference value are both smaller than zero, determining that the change trend is the same in the change direction;
otherwise, determining the change trend to be different in change direction.
A third aspect of the embodiments of the present invention provides a regulation and control device based on the high-voltage ac chopper sampling circuit, where the device includes:
the debugging and collecting module is used for collecting and adjusting time error parameters from the high-voltage alternating-current chopping sampling circuit after inputting pulse width modulation signals to the high-voltage alternating-current chopping sampling circuit;
the actual acquisition module is used for acquiring real-time parameters from the high-voltage alternating-current chopping sampling circuit after the high-voltage alternating-current chopping sampling circuit inputs high-voltage alternating-current chopping voltage, and the real-time parameters comprise: a real-time pulse width time parameter and a real-time average voltage parameter;
and the analysis and regulation module is used for carrying out operation and analysis on the adjustment time error parameter, the real-time pulse width time parameter and the real-time average voltage parameter to obtain a pulse width modulation signal.
Compared with the prior art, the high-voltage alternating-current chopping sampling circuit, the regulation and control method and the device provided by the embodiment of the invention have the beneficial effects that: the sampling circuit is provided with the current-limiting switching circuit and the pulse width modulation circuit, different working voltages are switched and adjusted through the current-limiting switching circuit to adapt to different loads, and different load types are adjusted through the pulse width modulation circuit, so that the difficulty of regulation and control is reduced under the condition of simplifying the circuit, and meanwhile, the stability and the anti-interference capability of output voltage are improved.
Drawings
Fig. 1 is a schematic structural diagram of a high-voltage ac chopper sampling circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a high-voltage ac chopper sampling circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an application structure of a high-voltage ac chopper sampling circuit according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a regulation and control method based on a high-voltage ac chopper sampling circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a regulation and control device based on a high-voltage ac chopper sampling circuit according to an embodiment of the present invention.
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.
The prior commonly used silicon controlled rectifier controller has the following technical problems: firstly, the voltage modulated by the silicon controlled controller is only suitable for pure resistance load and load with working voltage matched with commercial power, and is difficult to adapt capacitive load, inductive load or low-voltage working load, if a capacitive, emotional or low-voltage allocation circuit is added at the output end of the silicon controlled controller, because the electric signal is subjected to multiple processing, once the circuit is interfered, the output voltage is easy to change, the stability of the voltage is reduced, the regulation and control difficulty is increased, and the difficulty and the cost of an integrated circuit can be increased by increasing the configuration circuit, so that the silicon controlled controller is not suitable for popularization and use.
In order to solve the above problem, a high-voltage ac chopping sampling circuit provided in the embodiments of the present application will be described and explained in detail by the following specific embodiments.
Referring to fig. 1, a schematic structural diagram of a high-voltage ac chopper sampling circuit according to an embodiment of the present invention is shown.
In one embodiment, the high-voltage ac chopping sampling circuit may include:
the input filtering module, the current-limiting switching module, the pulse width modulation module and the low-pass filtering module;
the input filtering module, the current-limiting switching module, the pulse width modulation module and the low-pass filtering module are sequentially connected;
the input filtering module is used for carrying out rectification filtering processing on the input voltage;
the current-limiting switching module is used for switching and matching different input voltages and performing current-limiting processing on the filtering voltage output by the input filtering module;
the pulse width modulation module is used for performing reverse phase shaping processing on the current-limiting voltage output by the current-limiting switching module;
and the low-pass filtering module is used for performing low-pass filtering processing on the in-phase voltage output by the pulse width modulation module.
When the current limiting switching module is used, the input alternating current voltage can pass through the input filtering module, the input filtering module is used for rectifying and filtering the input alternating current voltage, and the filtered voltage is input to the current limiting switching module; then the current-limiting switching module can switch and match different input voltages based on actual use requirements, perform current-limiting processing on the filtered voltage, and send the current-limited voltage to the pulse width modulation module; then the pulse width modulation module can perform inverse phase shaping processing on the voltage after current limiting so as to adjust the voltage to a corresponding phase, and transmit the voltage after phase adjustment to the low-pass filtering module; and finally, the low-pass filtering module performs low-pass filtering processing on the adjusted voltage and generates a pulse width modulation signal for subsequent regulation and control processing so as to control illumination of different LED lamps.
In the embodiment, different working voltages are switched and adjusted through the current-limiting switching circuit to adapt to different loads, and different load types are adjusted through the pulse width modulation circuit, so that the stability of the output voltage is improved under the condition of simplifying the circuit.
Referring to fig. 2, a schematic circuit diagram of a high-voltage ac chopper sampling circuit according to an embodiment of the present invention is shown.
In one embodiment, the input filtering module includes: the input filter resistor R1, the rectifier bridge stack BD1 and the input filter capacitor C1;
a first end and a second end of the rectifier bridge stack BD1 are respectively connected to an input end of the input filter module, and are configured to receive ac chopping, a third end of the rectifier bridge stack BD1 is connected to one end of the input filter resistor R1, the other end of the input filter resistor R1 is connected to one end of the input filter capacitor C1, a fourth end of the rectifier bridge stack BD1 and the other end of the input filter capacitor C1 are respectively connected to a ground terminal, and a connection end of the input filter resistor R1 and the input filter capacitor C1 is connected to an output end of the input filter module.
In one embodiment, the current limit switching module includes: the circuit comprises a switch S1, a first switching resistor R2, a second switching resistor R3, a voltage stabilizing diode D1, a switching filter capacitor C2 and a current limiting resistor R4;
one end of the switch S1 is connected to an input end of the current-limiting switching module, the other end of the switch S1 is connected to one end of the first switching resistor R2 or one end of the second switching resistor R3, the other end of the first switching resistor R2 or the other end of the second switching resistor R3 is connected to a negative terminal of the zener diode D1, one end of the switching filter capacitor C2 and one end of the current-limiting resistor R4, the positive terminal of the zener diode D1 and the other end of the switching filter capacitor C2 are connected to a ground terminal, the other end of the current-limiting resistor R4 is connected to an output end of the current-limiting switching module, and a pulse width debug input port is provided at a connection end of the switching filter capacitor C2 and the current-limiting resistor R4 for inputting a stable pulse width debug signal.
In particular, the pulse width debug signal may be a PWM reference debug signal.
In one embodiment, the pulse width modulation module includes: the photoelectric coupler OP1, the first modulation resistor R5, the second modulation resistor R6, the modulation capacitor C3 and the NMOS tube Q1;
the positive electrode end of the emitter of the photoelectric coupler OP1 is connected with the input end of the pulse width modulation module, the negative electrode end and the receiving E electrode end of the emitter of the photoelectric coupler OP1 are respectively connected with the grounding end, the receiving C electrode end of the photoelectric coupler OP1 is respectively connected with one end of the first modulation resistor R5, one end of the modulation capacitor C3 and the grid electrode end of the NMOS tube Q1, the other end of the modulation capacitor C3 and the source electrode end of the NMOS tube Q1 are respectively connected with the grounding end, the drain electrode end of the NMOS tube Q1 is connected with one end of the second modulation resistor R6, the other end of the first modulation resistor R5 and the other end of the second modulation resistor R6 are respectively connected with the power supply end, the connecting end of the NMOS tube Q1 and the second modulation resistor R6 is connected with the output end of the pulse width modulation module, and the output end of the pulse width modulation module is provided with a pulse width sampling port, for collecting the pulse width time.
The pulse width sampling port may be used to acquire real-time pulse width modulation time.
In one embodiment, the low pass filtering module includes: the constant current source I1, a first low-pass filter resistor R7, a second low-pass filter resistor R8, a third low-pass filter resistor R9, a first low-pass filter capacitor C4 and a second low-pass filter capacitor C5;
the switch input end of the constant current source I1 is connected with the input end of the low-pass filter module, the voltage input end of the constant current source I1 is connected with a power supply end, the voltage output end of the constant current source I1 is connected with one end of the first low-pass filter resistor R7 and one end of the second low-pass filter resistor R8 respectively, the other end of the second low-pass filter resistor R8 is connected with one end of the third low-pass filter resistor R9 and one end of the first low-pass filter capacitor C4 respectively, the other end of the third low-pass filter resistor R9 is connected with one end of the second low-pass filter capacitor C5 respectively, the other end of the first low-pass filter resistor R7, the other end of the first low-pass filter capacitor C4 and the other end of the second low-pass filter capacitor C5 are connected with a ground terminal respectively, and the connection end of the third low-pass filter resistor R9 and the second low-pass filter capacitor C5 is provided with a voltage sampling port, for collecting the average voltage.
In particular, the voltage sampling port may be used to collect a real-time average voltage.
In an embodiment, the high-voltage ac chopped voltage may be rectified by the rectifier bridge stack BD1, and then, the rectified voltage may be connected to the common terminal of the voltage switch S1 through the rc filter circuit of the input filter resistor R1 and the input filter capacitor C1, one terminal of the S1 switch is connected to the 110V first switching resistor R2, and the other terminal thereof is connected to the 220V second switching resistor R3, so that switching may be performed when different operating voltages are used.
The voltage-stabilizing two-plate tube D1 can limit the working voltage, and plays a role of current limiting together with the current-limiting resistor R4, thereby preventing the light-emitting diode of the photoelectric coupler OP1 from being damaged by overcurrent. The output end of the photoelectric coupler OP1 is connected with an NMOS tube Q1, and outputs pulse width modulation voltage with the same phase after being subjected to reverse phase shaping by an NMOS tube Q1. The pulse width modulation voltage is connected with the switch input end of a constant current source I1, the voltage output end of the constant current source I1 is connected with a first low-pass filter resistor R7, and a low-pass filter circuit is composed of a second low-pass filter resistor R8, a third low-pass filter resistor R9, a first low-pass filter capacitor C4 and a second low-pass filter capacitor C5.
The constant current source I1 may be a MOS device or a transistor device.
Referring to fig. 3, an application structure schematic diagram of a high-voltage ac chopper sampling circuit according to an embodiment of the present invention is shown.
In an embodiment, the input end of the high-voltage ac chopping sampling circuit may be connected to an ac chopping voltage, the ac chopping voltage is adjusted and sampled, pulse width time and voltage level are obtained through sampling, and finally, the pulse width time and the voltage level are analyzed and processed, and a final control signal is obtained through calculation, and then dimming or voltage regulation control is performed through a controller.
In this embodiment, an embodiment of the present invention provides a high-voltage ac chopper sampling circuit, which has the following beneficial effects: the sampling circuit is provided with the current-limiting switching circuit and the pulse width modulation circuit, different working voltages are switched and adjusted through the current-limiting switching circuit to adapt to different loads, and different load types are adjusted through the pulse width modulation circuit, so that the difficulty of regulation and control is reduced under the condition of simplifying the circuit, and meanwhile, the stability and the anti-interference capability of output voltage are improved.
Referring to fig. 4, a schematic flow chart of a regulation and control method based on a high-voltage ac chopper sampling circuit according to an embodiment of the present invention is shown.
As an example, the method for regulating and controlling based on the high-voltage ac chopper sampling circuit may include:
and S11, after the pulse width modulation signal is input into the high-voltage alternating-current chopping sampling circuit, acquiring and adjusting time error parameters from the high-voltage alternating-current chopping sampling circuit.
In an embodiment, the high-voltage ac chopping sampling circuit is provided with a pulse width debugging input port, and a user can input a PWM reference debugging signal to the high-voltage ac chopping sampling circuit through the pulse width debugging input port. After the PWM reference debugging signal is input, a debugging pulse width parameter and a debugging voltage parameter can be respectively collected from a pulse width sampling port and a voltage sampling port of the high-voltage alternating-current chopping sampling circuit, and a debugging time error parameter is calculated by utilizing the debugging pulse width parameter and the debugging voltage parameter.
For example, in the case of circuit parameter determination, the parameters of the input pulse width modulation signal are specifically: the frequency f is 100Hz, the gray scale G is 100 and the duty ratio n is 0-100. After the pulse width modulation signal is input through the pulse width modulation input port, the pulse width time value Push [ n ] corresponding to each input duty ratio n is sampled through the pulse width sampling port. The pulse width time unit is microsecond us, 100 pulse width time values are generated, the reference pulse width time set Push [100] - (T0, T1, T2.. T100) is formed, and a debugging pulse width parameter is obtained. T0, T1, T2, say.. T100 represents 0 microseconds, 1 microsecond, 2 microsecond … 100 microseconds, respectively, in the above set.
Similarly, the average level value Volt [ n ] corresponding to each input duty cycle n is sampled through the voltage sampling port. The unit of the average level is millivolt mV, 100 average level values are generated, and the reference average level set Volt [100] = { V0, V1, V2.. a. V0, V1, V2, in the above set, means 0 mv, 1 mv, 2 mv … 100 mv, respectively.
It should be noted that 100 times of the debug pulse width parameter and 100 voltage values of the debug voltage parameter are in one-to-one correspondence, and each time corresponds to one voltage value.
According to the values of the debug pulse width parameter, a set of pulse width time error Du [100] (D0, D1, D2.. D100) of allowable fluctuation range corresponding to each pulse width time set Push [ n ] value in a one-to-one mode is determined. The pulse width time error unit is microsecond us. The set of values of the pulse width time error is an adjustment time error parameter. In the above set, since each voltage value corresponds to one time of the pulse width parameter, and each time corresponds to one time error value, each voltage value corresponds to one time error value.
Alternatively, the adjusted time error parameter may be estimated based on the value of the debug pulse width parameter (e.g., Push [100 ]).
Specifically, the estimation method for adjusting the time error parameter can be performed during the process of debugging the signal circuit, in which after the debugging signal is inputted, the difference between the duty cycle time of each inputted PWM signal and the pulse width time of the detected output PWM signal is calculated, the difference is allowed to fluctuate within a small range, and the series of differences forms the pulse width time error set Du [100 ].
S12, after the high-voltage alternating-current chopping sampling circuit is input with high-voltage alternating-current chopping voltage, acquiring real-time parameters from the high-voltage alternating-current chopping sampling circuit, wherein the real-time parameters comprise: a real-time pulse width time parameter and a real-time average voltage parameter.
After the data of debugging are acquired and recorded, the alternating-current chopping voltage can be started and accessed, then the actual alternating-current chopping voltage is input into the circuit, and the circuit parameters are output after the actual alternating-current chopping voltage is input into the acquisition circuit.
Specifically, after the alternating-current chopping voltage is input, the corresponding pulse width time and voltage value can be respectively acquired through the pulse width sampling port and the voltage sampling port, so that a real-time pulse width time parameter and a real-time average voltage parameter are respectively obtained.
It should be noted that the sampling manner of the real-time pulse width time parameter and the real-time average voltage parameter is the same as the sampling manner of the debug pulse width parameter and the debug voltage parameter in step S11, and for avoiding repetition, details are not described herein again, and reference may be made to the foregoing description specifically.
And S13, carrying out operation analysis on the adjustment time error parameter, the real-time pulse width time parameter and the real-time average voltage parameter to obtain a pulse width modulation signal.
After the adjustment time error parameter, the real-time pulse width time parameter and the real-time average voltage parameter are obtained, corresponding logic calculation can be performed by using the three parameters to adjust and generate a corresponding pulse width modulation signal, so that dimming and voltage regulation control can be performed on the LED lamp according to the pulse width modulation signal.
In order to fit the actual situation and improve the accuracy of the calculation analysis, in one embodiment, the step S13 may include the following sub-steps:
and a substep S131, searching an error time value corresponding to the level value in the adjustment time error parameter according to the level value of the real-time average voltage parameter.
Referring to the above example, since the voltage values and the time error values are in a one-to-one correspondence relationship, the magnitude of the real-time average voltage parameter is determined first, and the error time value corresponding to the level value in the time error parameter is adjusted according to the magnitude of the real-time average voltage parameter.
And a substep S132 of calculating a modulation time difference value between the pulse width time value corresponding to the real-time pulse width time parameter and the error time value.
The difference value between the pulse width time value corresponding to the real-time pulse width time parameter and the error time value can be directly calculated, so that the modulation time difference value is obtained.
And a substep S133 of generating a pulse width modulation signal based on the modulation time difference adjustment.
Alternatively, the corresponding pulse width modulation signal may be generated based on the magnitude of the modulation time difference.
In one embodiment, the substep S133 may comprise the substeps of:
and a substep S1331, if the time difference value is smaller than a preset difference value, generating a pulse width modulation signal by taking the level value of the real-time average voltage parameter as the duty ratio time, and recording an effective pulse width time value and an effective average level value corresponding to the generated pulse width modulation signal.
And if the time difference is smaller than the preset difference, the numerical value of the current sampling is valid. The value of the level value of the real-time average voltage parameter can be taken as the duty ratio at the time t to output the pulse width modulation signal Pt, and the effective pulse width time value Tt and the effective average level value Vt at the time t can also be recorded, where t can be the time of the pulse width.
And a substep S1332, if the time difference value is greater than a preset difference value, determining the real-time change trend of the circuit in the current time node.
If the time difference is greater than the preset difference, it indicates that the sampled value exceeds the preset error time range, and it needs to determine whether the sampled value is valid.
The real-time change trend of the circuit parameters in the current time node can be determined, so that whether the sampling parameters are effective or not can be determined according to the change trend, and whether the sampling parameters are adopted for subsequent calculation or not can be determined.
To accurately determine the specific variation trend, in one embodiment, step S1332 may include the following sub-steps:
and a substep S13321 of obtaining a historical time parameter and a historical voltage parameter respectively, where the historical time parameter is a time value corresponding to a previous time node, and the historical voltage parameter is a voltage value corresponding to the previous time node.
In particular, the previous time node may be the time node at which the sample was taken or sampled at the last time. Correspondingly, the historical time parameter is a time value acquired at the last moment, and specifically can be pulse width time; the historical voltage parameter is the voltage value collected at the last moment.
And a substep S13322 of calculating a comparison time difference between the real-time pulse width time parameter and the historical time parameter, and calculating a comparison voltage difference between the real-time average voltage parameter and the historical voltage parameter.
Specifically, the difference between the real-time pulse width time parameter and the historical time parameter can be calculated to obtain a comparison time difference; similarly, the difference between the real-time average voltage parameter and the historical voltage parameter can be calculated to obtain a comparison voltage difference.
And a substep S13323, determining that the change trend is the same as the change direction when the comparison time difference value and the comparison voltage difference value are both greater than zero or the comparison time difference value and the comparison voltage difference value are both less than zero.
And step S13324, otherwise, determining the change trend to be different in change direction.
Specifically, when the comparison time difference is greater than zero, it indicates that the time is in the increasing change direction, otherwise, it indicates that the time is in the decreasing change direction; similarly, when the comparison voltage difference is greater than zero, it indicates that the voltage is in the increasing change direction, otherwise, it indicates that the voltage is in the decreasing change direction.
When the pulse width time and the average level are increased or decreased at the same time, that is, the change directions are the same, the value sampled at the time t can be judged to be valid; when the pulse width time is in the increasing change direction and the average level is in the decreasing change direction, or when the pulse width time is in the decreasing change direction and the average level is in the increasing change direction, the change directions are different, and the collected data are invalid.
And a substep S1333, if the change trend is that the change directions are the same, generating a pulse width modulation signal by taking the level value of the real-time average voltage parameter as the duty ratio time, and recording an effective pulse width time value and an effective average level value corresponding to the generated pulse width modulation signal.
And a substep S1334, if the change trend is different, using the historical pwm signal generated by the previous time node as the pwm signal.
When the change trend is the same as the change direction, the level value of the real-time average voltage parameter can be directly used as the duty ratio time to generate a pulse width modulation signal; and when the change trend is different in change direction, taking the pulse width modulation signal sampled at the last time t-1 as the pulse width modulation signal at the current time t.
In an embodiment, the method may further include:
and S14, transmitting the pulse width modulation signal to a preset control unit for the preset control unit to control the light source.
After the pulse width modulation signal is obtained, the pulse width modulation signal can be transmitted to the corresponding control unit, so that the corresponding control unit can perform corresponding regulation and control processing.
Referring to fig. 3, in an embodiment, the preset control unit may be an MCU control unit.
In this embodiment, an embodiment of the present invention provides a regulation and control method based on a high-voltage ac chopper sampling circuit, which has the following beneficial effects: the invention can collect two parameters of corresponding pulse width time and average voltage of the high-voltage AC chopping sampling circuit respectively under two states of debugging and actual use, and carries out analysis and calculation based on the circuit parameters collected under two different states so as to screen and determine the corresponding duty ratio time, thereby generating an effective modulation signal based on duty ratio time conversion and accurately controlling the circuit rear-end device to carry out corresponding work. The invention not only reduces the regulation and control difficulty, but also improves the regulation and control accuracy and the regulation and control effect.
The embodiment of the invention also provides a regulating and controlling device based on the high-voltage alternating-current chopping sampling circuit, and the structural schematic diagram of the regulating and controlling device based on the high-voltage alternating-current chopping sampling circuit provided by the embodiment of the invention is shown in fig. 5.
As an example, the regulating and controlling device based on the high-voltage ac chopping sampling circuit may include:
the debugging and collecting module 501 is configured to collect a time error parameter from the high-voltage ac chopper sampling circuit after inputting a pulse width modulation signal to the high-voltage ac chopper sampling circuit;
an actual acquisition module 502, configured to acquire real-time parameters from the high-voltage ac chopper sampling circuit after a high-voltage ac chopper voltage is input to the high-voltage ac chopper sampling circuit, where the real-time parameters include: a real-time pulse width time parameter and a real-time average voltage parameter;
and an analysis and control module 503, configured to perform operation and analysis on the adjustment time error parameter, the real-time pulse width time parameter, and the real-time average voltage parameter, so as to obtain a pulse width modulation signal.
Optionally, the analysis modulation module is further configured to:
searching an error time value corresponding to the level value in the adjustment time error parameter according to the level value of the real-time average voltage parameter;
calculating a modulation time difference value between a pulse width time value corresponding to the real-time pulse width time parameter and the error time value;
and generating a pulse width modulation signal based on the modulation time difference adjustment.
Optionally, the analysis modulation module is further configured to:
if the time difference value is smaller than a preset difference value, generating a pulse width modulation signal by taking the level value of the real-time average voltage parameter as the duty ratio time, and recording an effective pulse width time value and an effective average level value corresponding to the generated pulse width modulation signal;
if the time difference is larger than a preset difference, determining the real-time change trend of the circuit in the current time node;
if the change trend is that the change directions are the same, generating a pulse width modulation signal by taking the level value of the real-time average voltage parameter as the duty ratio time, and recording an effective pulse width time value and an effective average level value corresponding to the generated pulse width modulation signal;
and if the change trend is that the change directions are different, taking the historical pulse width modulation signal generated by the previous time node as the pulse width modulation signal.
Optionally, the analysis modulation module is further configured to:
respectively acquiring a historical time parameter and a historical voltage parameter, wherein the historical time parameter is a time value corresponding to a previous time node, and the historical voltage parameter is a voltage value corresponding to the previous time node;
calculating a comparison time difference value between the real-time pulse width time parameter and the historical time parameter, and calculating a comparison voltage difference value between the real-time average voltage parameter and the historical voltage parameter;
when the comparison time difference value and the comparison voltage difference value are both larger than zero, or the comparison time difference value and the comparison voltage difference value are both smaller than zero, determining that the change trend is the same in the change direction;
otherwise, determining the change trend to be different in change direction.
It can be clearly understood by those skilled in the art that, for convenience and brevity, the specific working process of the apparatus described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
Further, an embodiment of the present application further provides an electronic device, including: the regulation and control method based on the high-voltage alternating-current chopping sampling circuit comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein when the processor executes the program, the regulation and control method based on the high-voltage alternating-current chopping sampling circuit is realized.
Further, an embodiment of the present application also provides a computer-readable storage medium, where computer-executable instructions are stored, and the computer-executable instructions are used to enable a computer to execute the regulation and control method based on the high-voltage ac chopping sampling circuit according to the above embodiment.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A high-voltage AC chopping sampling circuit, characterized in that, the high-voltage AC chopping sampling circuit includes: the input filtering module, the current-limiting switching module, the pulse width modulation module and the low-pass filtering module;
the input filtering module, the current-limiting switching module, the pulse width modulation module and the low-pass filtering module are sequentially connected;
the input filtering module is used for carrying out rectification filtering processing on the input voltage;
the current-limiting switching module is used for switching and matching different input voltages and performing current-limiting processing on the filtering voltage output by the input filtering module;
the pulse width modulation module is used for performing reverse phase shaping processing on the current-limiting voltage output by the current-limiting switching module;
and the low-pass filtering module is used for performing low-pass filtering processing on the in-phase voltage output by the pulse width modulation module.
2. The high-voltage AC chopping sampling circuit according to claim 1, wherein the current-limiting switching module comprises: the device comprises a selector switch, a first switching resistor, a second switching resistor, a voltage stabilizing diode, a switching filter capacitor and a current limiting resistor;
wherein, change over switch's one end with current-limiting switch module's input is connected, change over switch's the other end respectively with the one end of first switched resistor or the one end of second switched resistor is connected, the other end of first switched resistor or the other end of second switched resistor respectively with zener diode's negative pole end, switch filter capacitor's one end with current-limiting resistor's one end is connected, zener diode's positive terminal with switch filter capacitor's the other end is connected with the earthing terminal, current-limiting resistor's the other end with current-limiting switch module's output is connected, switch filter capacitor with current-limiting resistor's link is equipped with pulse width debugging input port for input pulse width debugging signal.
3. The high-voltage alternating-current chopping sampling circuit according to claim 1, wherein the pulse width modulation module comprises: the device comprises a photoelectric coupler, a first modulation resistor, a second modulation resistor, a modulation capacitor and an NMOS (N-channel metal oxide semiconductor) tube;
the positive pole end of the emitter of the photoelectric coupler is connected with the input end of the pulse width modulation module, the negative pole end of the emitter of the photoelectric coupler and the extreme end of the receiving E of the photoelectric coupler are respectively connected with the grounding end, the receiving C pole terminal of the photoelectric coupler is respectively connected with one end of the first modulation resistor, one end of the modulation capacitor and the grid terminal of the NMOS tube, the other end of the modulation capacitor and the source end of the NMOS tube are respectively connected with a grounding end, the drain end of the NMOS tube is connected with one end of the second modulation resistor, the other end of the first modulation resistor and the other end of the second modulation resistor are respectively connected with a power supply end, the connecting end of the NMOS tube and the second modulation resistor is connected with the output end of the pulse width modulation module, and the output end of the pulse width modulation module is provided with a pulse width sampling port for collecting pulse width time.
4. The high-voltage AC chopping sampling circuit according to claim 1, wherein the low-pass filtering module comprises: the constant current source, the first low-pass filter resistor, the second low-pass filter resistor, the third low-pass filter resistor, the first low-pass filter capacitor and the second low-pass filter capacitor;
the switch input end of the constant current source is connected with the input end of the low-pass filtering module, the voltage input end of the constant current source is connected with the power supply end, the voltage output end of the constant current source is respectively connected with one end of the first low-pass filter resistor and one end of the second low-pass filter resistor, the other end of the second low-pass filter resistor is respectively connected with one end of the third low-pass filter resistor and one end of the first low-pass filter capacitor, the other end of the third low-pass filter resistor is connected with one end of the second low-pass filter capacitor, the other end of the first low-pass filter resistor, the other end of the first low-pass filter capacitor and the other end of the second low-pass filter capacitor are respectively connected with a grounding terminal, and a voltage sampling port is arranged at the connecting end of the third low-pass filter resistor and the second low-pass filter capacitor and is used for collecting average voltage.
5. The high-voltage alternating-current chopping sampling circuit according to claim 1, wherein the input filtering module comprises: the input filter resistor, the rectifier bridge stack and the input filter capacitor;
the first end and the second end of the rectifier bridge stack are respectively connected with the input end of the input filter module and used for receiving alternating current chopping, the third end of the rectifier bridge stack is connected with one end of the input filter resistor, the other end of the input filter resistor is connected with one end of the input filter capacitor, the fourth end of the rectifier bridge stack and the other end of the input filter capacitor are respectively connected with the ground terminal, and the connecting end of the input filter resistor and the input filter capacitor is connected with the output end of the input filter module.
6. A regulation and control method based on the high-voltage alternating-current chopping sampling circuit as claimed in any one of claims 1 to 5, characterized in that the method comprises the following steps:
after pulse width modulation signals are input into the high-voltage alternating-current chopping sampling circuit, acquiring and adjusting time error parameters from the high-voltage alternating-current chopping sampling circuit;
after the high-voltage alternating-current chopping sampling circuit is input with high-voltage alternating-current chopping voltage, real-time parameters are collected from the high-voltage alternating-current chopping sampling circuit, wherein the real-time parameters comprise: a real-time pulse width time parameter and a real-time average voltage parameter;
and carrying out operation analysis on the adjustment time error parameter, the real-time pulse width time parameter and the real-time average voltage parameter to obtain a pulse width modulation signal.
7. The method of claim 6, wherein the computational analysis comprises:
searching an error time value corresponding to the level value in the adjustment time error parameter according to the level value of the real-time average voltage parameter;
calculating a modulation time difference value between a pulse width time value corresponding to the real-time pulse width time parameter and the error time value;
and generating a pulse width modulation signal based on the modulation time difference adjustment.
8. The method of claim 7, wherein the adjusting generating a pulse width modulated signal based on the time difference value comprises:
if the time difference value is smaller than a preset difference value, generating a pulse width modulation signal by taking the level value of the real-time average voltage parameter as the duty ratio time, and recording an effective pulse width time value and an effective average level value corresponding to the generated pulse width modulation signal;
if the time difference is larger than a preset difference, determining the real-time change trend of the circuit in the current time node;
if the change trend is that the change directions are the same, generating a pulse width modulation signal by taking the level value of the real-time average voltage parameter as the duty ratio time, and recording an effective pulse width time value and an effective average level value corresponding to the generated pulse width modulation signal;
and if the change trend is that the change directions are different, taking the historical pulse width modulation signal generated by the previous time node as the pulse width modulation signal.
9. The method of claim 8, wherein determining the real-time trend of the circuit at the current time node comprises:
respectively acquiring a historical time parameter and a historical voltage parameter, wherein the historical time parameter is a time value corresponding to a previous time node, and the historical voltage parameter is a voltage value corresponding to the previous time node;
calculating a comparison time difference value between the real-time pulse width time parameter and the historical time parameter, and calculating a comparison voltage difference value between the real-time average voltage parameter and the historical voltage parameter;
when the comparison time difference value and the comparison voltage difference value are both larger than zero, or the comparison time difference value and the comparison voltage difference value are both smaller than zero, determining that the change trend is the same in the change direction;
otherwise, determining the change trend to be different in change direction.
10. A regulation and control device based on the high-voltage AC chopping sampling circuit according to any one of claims 1-5, characterized in that the device comprises:
the debugging and collecting module is used for collecting and adjusting time error parameters from the high-voltage alternating-current chopping sampling circuit after inputting pulse width modulation signals to the high-voltage alternating-current chopping sampling circuit;
the actual acquisition module is used for acquiring real-time parameters from the high-voltage alternating-current chopping sampling circuit after the high-voltage alternating-current chopping sampling circuit inputs high-voltage alternating-current chopping voltage, and the real-time parameters comprise: a real-time pulse width time parameter and a real-time average voltage parameter;
and the analysis and regulation module is used for carrying out operation and analysis on the adjustment time error parameter, the real-time pulse width time parameter and the real-time average voltage parameter to obtain a pulse width modulation signal.
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| CN202210071993.6A CN114421935A (en) | 2022-01-21 | 2022-01-21 | High-voltage alternating-current chopping sampling circuit, regulation and control method and device |
| PCT/CN2022/126103 WO2023138125A1 (en) | 2022-01-21 | 2022-10-19 | High-voltage alternating current (ac) chopper sampling circuit, regulation method, and regulation apparatus |
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| CN202210071993.6A CN114421935A (en) | 2022-01-21 | 2022-01-21 | High-voltage alternating-current chopping sampling circuit, regulation and control method and device |
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| US8040070B2 (en) * | 2008-01-23 | 2011-10-18 | Cree, Inc. | Frequency converted dimming signal generation |
| EP2671427A1 (en) * | 2011-01-31 | 2013-12-11 | Koninklijke Philips N.V. | Device and method for interfacing a dimming control input to a dimmable lighting driver with galvanic isolation |
| CN108282935B (en) * | 2018-03-30 | 2019-12-17 | 广州市雅江光电设备有限公司 | LED dimming method, device, equipment and storage medium |
| CN113228828B (en) * | 2018-11-26 | 2023-07-28 | 上海晶丰明源半导体股份有限公司 | Control circuit, driving system, chip, control method and driving method |
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