Dimmer Holding Current Control Circuit for Phase Cut Dimming
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Solution Overview
Problem
Existing phase cut dimmer holding current control circuits have high power consumption, high heat radiation, and are difficult to adjust, leading to noise and reliability issues.
Innovation Solution
A phase cut dimmer holding current control circuit comprising rectifier diodes, a field-effect transistor, triodes, current-limiting resistances, sampling resistances, and capacitance, connected in a specific configuration to provide a stable and adjustable holding current with low power consumption and reduced heat radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an X capacitance and bleeder resistance are connected to provide holding current, then the dimmer can maintain conducting state, but the power consumption increases and heat radiation increases
Solution Approach 1:
The patent changes the operating parameters of the holding current circuit by using a transistor switch to control the bleeder resistance. The transistor is turned on only during specific time periods when the dimmer needs holding current, rather than keeping the bleeder resistance continuously connected. This temporal parameter change reduces energy loss while maintaining the necessary conducting state.
Solution Approach 2:
The patent implements periodic action by using a transistor switch that is turned on and off in cycles. The transistor is activated during the period when the dimmer requires holding current and deactivated during other periods. This periodic operation allows the circuit to provide holding current only when necessary, reducing continuous power consumption and heat radiation.
2Reliability
If an X capacitance and DM inductor are connected in series to provide holding current, then the dimmer can maintain conducting state, but the power consumption increases and heat radiation increases
Solution Approach 1:
The patent changes the operational state of the DM inductor by controlling the transistor switch. The inductor is only active during the period when the transistor is on, rather than continuously. This parameter change allows the circuit to maintain holding current functionality while significantly reducing continuous power consumption and heat generation from the inductor.
Solution Approach 2:
The patent applies periodic action by using the transistor switch to activate the DM inductor only during specific time intervals when holding current is needed. The transistor is turned on during the required period and turned off otherwise, creating a periodic operation pattern that reduces energy loss from the inductor while maintaining dimmer reliability.
3Reliability
If bleeder resistance and DM inductor are used to provide holding current, then the dimmer can maintain conducting state, but the temperature increases and reliability decreases
Solution Approach 1:
The patent uses periodic action through the transistor switch to activate the heat-generating components (bleeder resistance and DM inductor) only during the period when holding current is needed. By turning these components off during other periods, the average temperature rise is significantly reduced, improving the reliability of the overall system.
Solution Approach 2:
The patent changes the operational parameters of the heat-generating components by controlling the transistor switch. The bleeder resistance and DM inductor are only active during specific time periods when the transistor is on, rather than continuously. This parameter change reduces average temperature rise while maintaining the necessary holding current functionality.
4Reliability
If traditional holding current circuits are used, then the dimmer can maintain conducting state, but the holding current is difficult to control and adjust
Solution Approach 1:
The patent introduces dynamics by using a transistor switch that can be actively controlled to adjust the holding current. The transistor's on/off state and duty cycle can be dynamically adjusted to change the amount of holding current provided, making the circuit adaptable to different requirements. This dynamic control capability is not present in the static traditional circuits.
Solution Approach 2:
The patent implements feedback by using a transistor switch whose operation can be controlled based on the actual holding current requirements. The circuit can sense when holding current is needed and adjust the transistor's operation accordingly, providing a feedback mechanism that enables easy adjustment and optimization of the holding current level.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The circuit achieves a stable and adjustable holding current with low power consumption and heat radiation, enhancing the reliability and reducing noise in phase cut dimmers.
Implementation Method 1
rectifier diode I, rectifier diode II
Implementation Method 2
field-effect transistor
Implementation Method 3
triode
Implementation Method 4
capacitance
Data Source
AI summary
The Invention discloses and provides a kind of dimmer holding current control circuit for phase cut dimming power supply, which comprises phase cut dimming power supply circuit and LED lamp (1) and dimmer holding current control circuit (2). The dimmer holding current control circuit (2) is composed of rectifier diode I (D1), rectifier diode II (D2), field-effect transistor (Q1), triode (Q2), current-limiting resistance I (R1), current-limiting resistance II (R2), sampling resistance I (R4), sampling resistance II (R5), diode (D3), capacitance (C1) and resistance (R3). The anodes of the rectifier diode I (D1) and the rectifier diode II (D2) are respectively connected to L terminal and N terminal of main supply input. The Invention makes the current small and stable through current limitation. The Invention can be widely used in the field of phase cut dimming power supply.