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High voltage linear power current compensation circuit

A current compensation circuit and current compensation technology, which are applied in the layout of electric lamp circuits, electric light sources, lighting devices, etc., can solve the problems of LED lamp brightness change, output power change, increase and other problems, so as to facilitate the promotion of production and use and improve comfort. degree of effect

Active Publication Date: 2017-06-27
SHAANXI REACTOR MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there is a problem that the output power of high-voltage linear products in the market changes with the change of input voltage. For example, if the input voltage increases from 220Vac to 242Vac by 10%, the output power will increase by about 16%. The result of this is that the brightness of the LED lamp will decrease. significant changes

Method used

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Experimental program
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Embodiment 1

[0029] image 3 For the grid voltage sampling circuit structure of the high voltage linear power current compensation circuit of the present invention Figure 1 ,Such as image 3 As shown, this embodiment provides a power compensation circuit for sampling the gate voltage of a MOS transistor. The voltage sampling module includes: a comparator AR6, a resistor R12, and a capacitor C1; the non-inverting input terminal of the comparator AR6 is connected to a reference voltage , the inverting input end of which is connected to the gate of the MOS transistor Q2 that controls the last LED light string in the high-voltage linear circuit; the output end of the comparator AR6 is connected to one end of the resistor R12, and the other end of the resistor R12 is connected to the One end of capacitor C1 is connected, and the other end of capacitor C1 is grounded;

[0030] Specifically, the inverting input terminal of the comparator AR6 is connected to the gate of the MOS transistor Q2, a...

Embodiment 2

[0035] Further, in image 3 On the basis of the embodiments, the present invention also includes a signal processing module connected between the voltage sampling module and the current compensation module; the signal processing module is used to keep the voltage collected by the voltage sampling module stable and supply it to the current compensation module. Figure 4 For the grid voltage sampling circuit structure of the high voltage linear power current compensation circuit of the present invention Figure II ,Such as Figure 4 As shown, the signal processing module includes a voltage follower AR7 and a resistor R13, the non-inverting input terminal of the voltage follower AR7 is connected to the connection point of the resistor R12 and the capacitor C1, and the output terminal of the voltage follower AR7 is connected to one end of the resistor R13 The other end of the resistor R13 is connected to the source of the NMOS transistor Q9.

Embodiment 3

[0037] Figure 5 The drain voltage sampling circuit structure of the high-voltage linear power current compensation circuit of the present invention Figure 1 . In this embodiment, the current is supplemented by collecting the voltage of the drain of the MOS tube, so that the power of the LED light string is kept stable.

[0038] Such as Figure 5 As shown, the voltage sampling module includes a resistor R11, a resistor R12, a diode D1, a diode D2, and a capacitor C1; one end of the resistor R11 is connected to the drain of the MOS transistor Q5 that controls the first LED light string in the high-voltage linear circuit. The other ends are respectively connected to the anodes of the diode D1 and the diode D2, the cathode of the diode D2 is connected to one end of the resistor R12, and the other end of the resistor R12 is connected to the connection point of the capacitor C1.

[0039] In the voltage sampling module provided in this embodiment, when the input voltage of the r...

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Abstract

The invention provides a high-voltage linear power current compensating circuit. The high-voltage linear power current compensating circuit comprises a voltage sampling module and a current compensation module. One end of the voltage sampling module is connected with a drive switch which is located in a high-voltage linear circuit and used for controlling a certain section of an LED lamp string to be turned on or turned off, and the voltage sampling module is used for collecting the voltage of the drive switch. One end of the current compensation module is connected with the other end of the voltage sampling module, and the other end of the current compensation module is connected with the inverted input end of a comparator for controlling the turn-on time of the drive switch. The current compensation module is used for adjusting the voltage of the inverted input end of the comparator and then adjusting the breakover current of each section of the LED lamp string according to the voltage output by the comparator so that the output power of the LED lamp string can keep steady. The high-voltage linear power current compensating circuit enables the power of the LED lamp strings to keep steady through the current compensation module, so that the comfort level of a user is improved, and the high-voltage linear power current compensating circuit is a product which is quite practical and easy to popularize energetically, produce and use.

Description

technical field [0001] The present invention relates to the field of light emitting diode (Light Emitting Diode, hereinafter referred to as: LED) lighting technology field, in particular to a high-voltage linear power current compensation circuit. Background technique [0002] At present, there is a problem that the output power of high-voltage linear products in the market changes with the change of input voltage. For example, if the input voltage increases from 220Vac to 242Vac by 10%, the output power will increase by about 16%. The result of this is that the brightness of the LED lamp will decrease. There are obvious changes. The specific reasons are: attached figure 1 It is the waveform of current, voltage and time when the LED in the linear high-voltage LED line works normally, such as figure 1 As shown, when the input voltage waveform of the high-voltage linear circuit is shown as U1, the conduction current waveform of the LED light string connected inside it is sho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 杨波杨世红王虎
Owner SHAANXI REACTOR MICROELECTRONICS