CN-122028276-A - Alternating current dimmer control method and control system

CN122028276ACN 122028276 ACN122028276 ACN 122028276ACN-122028276-A

Abstract

The application discloses a control method and a control system of an alternating current light modulator, wherein the control method of the alternating current light modulator comprises the steps that a zero crossing sampling circuit collects original zero crossing signals and sends the original zero crossing signals to a microcomputer chip, an RC low-pass filtering sampling circuit carries out second-order low-pass filtering, output anti-ripple zero crossing sampling signals are sent to the microcomputer chip, an A/D conversion sampling circuit converts the original zero crossing signals into digital signals, the microcomputer chip compares the two paths of signals to identify ripple interference, generates and encodes control instructions, and transmits the control instructions to other light modulators connected in parallel through a fire wire output line, and each light modulator dynamically adjusts PWM output phases according to the ripple interference to achieve accurate synchronous light modulation. The application obviously improves the power grid ripple resistance and dimming stability of the system through double-path sampling, second-order filtering, ripple recognition and dynamic phase compensation, and is suitable for a multi-path parallel, single-live wire and master-slave-free alternating current dimming system.

Inventors

HUANG ZHICAN
LIU XIAOHONG

Assignees

深圳市时誉高精科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260318

Claims (10)

1. An ac dimmer control method, implemented based on a plurality of ac dimmer circuits connected in parallel between a live wire and a neutral wire of the same ac power supply, each of the ac dimmer circuits being connected to the same lighting load and each including an a/D conversion sampling circuit, a zero crossing sampling circuit, a Microcomputer Chip (MCU), a high-power MOS switch circuit, and an RC low-pass filter sampling circuit, is characterized in that the control method includes the steps of: The RC low-pass filtering sampling circuit performs second-order low-pass filtering on the alternating current signal, outputs an anti-ripple zero-crossing sampling signal and transmits the anti-ripple zero-crossing sampling signal to the microcomputer chip; The A/D conversion sampling circuit converts the original zero crossing point signal into a digital signal and transmits the digital signal to the microcomputer chip; the microcomputer chip compares the digital signal with the anti-ripple zero crossing sampling signal to identify ripple interference; The microcomputer chip generates a control instruction according to the operation or load state of a user and encodes the control instruction into a binary identification signal; the microcomputer chip controls the high-power MOS switch circuit, the coded control instruction is overlapped to a high-voltage alternating-current control signal, and the high-voltage alternating-current control signal is transmitted to other parallel circuits through a live wire output line; The other parallel circuits receive control signals, and after the signals are acquired by the A/D conversion sampling circuit and the zero crossing sampling circuit, the control instructions are identified by the microcomputer chip; the microcomputer chip dynamically adjusts PWM output phase to drive the high-power MOS switch circuit to execute dimming instruction in combination with ripple interference.
2. The method of claim 1, wherein the zero-crossing sampling circuit collects an original zero-crossing signal of the ac signal, outputs the zero-crossing sampling signal, and transmits the zero-crossing sampling signal to the microcomputer chip, and wherein the RC low-pass filtering sampling circuit performs second-order low-pass filtering on the ac signal, outputs an anti-ripple zero-crossing sampling signal, and transmits the anti-ripple zero-crossing sampling signal to the microcomputer chip, the RC low-pass filtering sampling circuit comprises: the RC low-pass filtering sampling circuit comprises a second-order RC low-pass filtering network consisting of a resistor R69, a resistor R70, a resistor R71, a resistor R72, a capacitor C27, a capacitor C28 and a capacitor C29; The live wire and the zero wire of the alternating current power supply are sequentially connected with the resistor R70 and the resistor R72 through the resistor R69; The first end of the capacitor C29 and the first end of the capacitor C28 are connected in parallel with a connecting node between the resistor R69 and the resistor R70, the first end of the resistor R71 and the first end of the capacitor C27 are connected in parallel with a connecting node between the resistor R70 and the resistor R72, and the second ends of the capacitor C29, the capacitor C28, the resistor R71 and the capacitor C27 are grounded; The resistor R72 is far away from the resistor R70 and is connected with the ZCP2 pin of the microcomputer chip.
3. The ac dimmer control method as claimed in claim 2, wherein said RC low-pass filtered sampling circuit further comprises: and a first end of the diode ZD6 is connected to a connection node of the resistor R72 and the ZCP2 pin, and a second end of the diode ZD6 is grounded.
4. The method for controlling an AC dimmer according to claim 1, wherein the zero-crossing sampling circuit comprises a resistor R57, a resistor R58, a resistor R59, a resistor R26, a diode ZD4, and a capacitor C10; Alternating current signals are connected with the first end of the resistor R57 through the diode D2 and the diode D3, the second end of the resistor R57 is connected with the first end of the resistor R26 through the resistor R58, the first end of the resistor R59 is connected with a connecting node between the resistor R58 and the resistor R26, the second end of the resistor R59 is grounded, the first end of the diode ZD4 and the first end of the capacitor C10 are connected with the connecting node between the second end of the resistor R26 and the ZCP1 of the MCU in parallel, and the second ends of the diode ZD4 and the capacitor C10 are grounded.
5. The method for controlling an AC dimmer according to claim 1, wherein the A/D conversion sampling circuit comprises a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R18, a resistor R7, a capacitor C8, a diode ZD2, and a diode ZD3; The alternating current signal is connected with the first end of the resistor R10 and the first end of the resistor R14 through the diode D2 and the diode D3, the second end of the resistor R10 is connected with the first end of the resistor R7 through the resistor R11, the first end of the resistor R12 is connected with a node between the resistor R11 and the resistor R7, the second end of the resistor R12 is grounded, and the first end of the diode ZD2 and the first end of the capacitor C7 are connected with a node between the second end of the resistor R7 and MultiDATA of the MCU; The second end of the resistor R14 is connected with the first end of the resistor R15 through the resistor R18, the first end of the resistor R13 is connected to a node between the resistor R18 and the resistor R15, the second end of the resistor R13 is grounded, and the first end of the diode ZD3 and the first end of the capacitor C8 are connected to a node between the second end of the resistor R15 and the H-AUTO of the MCU.
6. The method of claim 1, wherein the microcomputer chip generates control instructions according to user operation or load status and encodes the control instructions into binary identification signals, wherein the binary identification signals comprise a preamble, a command code, a numerical code and an end code.
7. The method of claim 1, wherein the microcomputer chip dynamically adjusts the PWM output phase in combination with the ripple interference to drive the high power MOS switching circuit to execute the dimming command, PWM output phase compensation amount Δt_comp=original zero crossing signal deviation-anti-ripple zero crossing sampling signal deviation.
8. The method of claim 1, wherein the control commands are mutually transferred and cooperatively executed through the live wire output line without distinguishing between the master and slave of the plurality of ac dimmer circuits.
9. The method of claim 1, wherein the microcomputer chip identifies the degree of ripple interference by at least one of zero crossing time deviation, rising edge time difference, and signal amplitude fluctuation when comparing the digital signal with the anti-ripple zero crossing sampling signal.
10. An alternating current light modulator control system is characterized by comprising an alternating current power supply module, at least two light modulator control units and a lighting load; the alternating current power supply module is used for outputting alternating current power supply signals; each dimmer control unit is provided with an alternating current dimmer circuit for executing the alternating current dimmer control method of any one of claims 1-9, wherein the alternating current dimmer circuit at least comprises an A/D conversion sampling circuit, a zero crossing sampling circuit, a Microcomputer Chip (MCU), a high-power MOS switching circuit, an RC low-pass filtering sampling circuit, an overload protection sampling circuit, a load short-circuit protection circuit and a power supply voltage stabilizing circuit, and the A/D conversion sampling circuit, the zero crossing sampling circuit, the high-power MOS switching circuit and the RC low-pass filtering sampling circuit are connected in parallel between a live wire and a zero wire of an alternating current power supply; All the dimmer control units are connected in parallel between the live wire and the zero wire of the alternating current power supply module, and the output ends of all the dimmer control units are electrically connected with the lighting load, so that the cooperative power supply and dimming control of the same load are realized; And a signal interaction link is established between the dimmer control units through a live wire output line, the master and slave are not separated, and the dual ripple suppression of the control signals is realized through the RC low-pass filtering sampling circuit so as to realize ripple identification and dynamic phase compensation through a microcomputer chip.

Description

Alternating current dimmer control method and control system Technical Field The application relates to the technical field of dimmers, is suitable for complex power grid scenes (especially suitable for ripple interference environments containing new energy grid connection such as solar energy, wind energy and the like) of single-live-wire parallel-connection multipath dimmers, and particularly relates to an alternating current dimmer control method and system. Background In the existing control method of the alternating current light modulator, a control scheme (such as patent number CN 202211434271.9) for connecting a plurality of light modulators in parallel with a single alternating current power supply exists, the core control logic is that a plurality of light modulators are connected in parallel with the same alternating current power supply, control signals are transmitted through zero crossing pulse codes (18 bit identification signals), the master and slave are not separated, and after receiving the signals, the light modulators identify and execute instructions to realize multi-channel mutual control. The existing control method has the defects that sampling related to ripple suppression is not arranged, and in a power grid environment containing new energy sources such as solar energy and wind energy, high-frequency ripple can cause the problems of large zero crossing detection deviation, error recognition of mutual control signals, false triggering of a protection mechanism and the like, so that serious problems such as load stroboscopic, mutual control breakdown and device damage are caused. Other existing control methods (externally-added switch type, master-slave type and wireless/power carrier type) also do not solve the problem of ripple interference, the externally-added switch type control method has no anti-ripple design and serious trigger delay, the master-slave type control method adjusts stroboscopic effect only through a simple potentiometer and cannot adapt to complex ripple environment, signal transmission of the wireless/power carrier type control method is easy to interfere with ripple, and instruction recognition accuracy is low. Accordingly, the prior art is still in need of improvement and development. Disclosure of Invention The application aims to provide a control method and a control system of an alternating current light modulator, and aims to solve the problems that the anti-ripple capacity is improved in the existing control method of the alternating current light modulator, a double-path sampling framework is constructed through an RC low-pass filtering sampling module, and the alternating current light modulator is high in anti-interference capacity, high in light modulation precision and stable in multipath synchronization by matching with ripple interference identification and dynamic phase compensation. In order to achieve the above purpose, the application adopts the following technical scheme: The application provides a control method of an alternating current light modulator, which is realized based on a plurality of alternating current light modulator circuits connected in parallel between a live wire and a zero wire of the same alternating current power supply, wherein each alternating current light modulator circuit is connected with the same lighting load and comprises an A/D conversion sampling circuit, a zero crossing sampling circuit, a Microcomputer Chip (MCU), a high-power MOS switching circuit and an RC low-pass filtering sampling circuit, and the control method comprises the following steps: The RC low-pass filtering sampling circuit performs second-order low-pass filtering on the alternating current signal, outputs an anti-ripple zero-crossing sampling signal and transmits the anti-ripple zero-crossing sampling signal to the microcomputer chip; The A/D conversion sampling circuit converts the original zero crossing point signal into a digital signal and transmits the digital signal to the microcomputer chip; the microcomputer chip compares the digital signal with the anti-ripple zero crossing sampling signal to identify ripple interference; The microcomputer chip generates a control instruction according to the operation or load state of a user and encodes the control instruction into a binary identification signal; the microcomputer chip controls the high-power MOS switch circuit, the coded control instruction is overlapped to a high-voltage alternating-current control signal, and the high-voltage alternating-current control signal is transmitted to other parallel circuits through a live wire output line; The other parallel circuits receive control signals, and after the signals are acquired by the A/D conversion sampling circuit and the zero crossing sampling circuit, the control instructions are identified by the microcomputer chip; the microcomputer chip dynamically adjusts PWM output phase to drive the high-power MOS switch circuit to execute