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Circuit arrangement for generating a reference voltage for a power supply of a led device

A technology of LED devices and circuit devices, applied in the direction of electrical components, etc., can solve the problem of high cost of circuit devices, and achieve the effect of simple cost

Active Publication Date: 2022-03-18
ZKW GRP GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Circuit arrangements according to the prior art are expensive and considered prohibitive for many applications

Method used

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  • Circuit arrangement for generating a reference voltage for a power supply of a led device
  • Circuit arrangement for generating a reference voltage for a power supply of a led device
  • Circuit arrangement for generating a reference voltage for a power supply of a led device

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Embodiment Construction

[0018] Now, refer to figure 1 , see circuit arrangement 1, which in principle has three voltage dividers, namely: a first voltage divider R1 / R2 consisting of two ohmic resistors R1, R2, which is at a constant Supply voltage U V , for example 5 volts; the second voltage divider R3 / R4 consisting of two ohmic resistors R3, R4, which is in the motor vehicle (KFZ) battery pack, ie the power supply 2 for the LED device LED The input voltage U B , for example 13V; and a third voltage divider R5 / R6 consisting of an ohmic resistor R5 and a thermistor R6 (NTC in this example) at a constant The supply voltage U V superior.

[0019] Suitably, the input voltage U B It is sent to the power supply 2 through the anti-jamming filter 3. Supply voltage UV can be fed to circuit arrangement 1 and power supply 2 together, but separate supply voltages are also possible.

[0020] Suitably, the power supply 2 comprises a controlled current source 4, the reference voltage U ref is delivered to ...

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PUM

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Abstract

A reference voltage (U ref ) of the circuit arrangement (1), where the power supply is based on the input voltage (U B ) to provide the feed current for the LED device (I S ), the feed current is determined by the value of the reference voltage, wherein the circuit arrangement has: a first voltage divider (R1 / R2) at a constant supply voltage (U V ) on; the second voltage divider (R3 / R4), which is at the input voltage of the power supply (2) (U B ); and a third voltage divider (R5 / R6) consisting of an ohmic resistor (R5) and a thermistor (R6) thermally coupled to the LED device, and said third voltage divider is at a constant power supply Voltage, a voltage proportional to the voltage at the middle connection terminal of the second voltage divider (R3 / R4) is delivered to the middle of the first voltage divider (R1 / R2) through the first diode (D1) connection terminal, a voltage proportional to the voltage at the intermediate connection terminal of the third voltage divider (R5 / R6) is also delivered to the first voltage divider (R1 / R2) via the second diode (D2) The intermediate connection terminal, while the voltage on the intermediate connection terminal of the first voltage divider (R1 / R2) is used as the reference voltage (U ref ) is delivered to the power supply (2).

Description

technical field [0001] The invention relates to a circuit arrangement for generating a reference voltage for a power supply for an LED arrangement, wherein the power supply provides a supply current for the LED arrangement based on an input voltage, which supply current is determined by the value of the reference voltage. Background technique [0002] Circuit arrangements of this type are known and used in power supplies for LED arrangements, usually series circuits of LEDs. Especially in the field of motor vehicle (KFZ) lighting technology, a high degree of constant brightness of LED installations is desired or required by regulation, where especially the current flowing through the device and the input voltage, mostly motor vehicle (KFZ) battery packs should be taken into account The dependence of the voltage fluctuation and the temperature of the LED device and should also avoid excessive LED temperature. [0003] Various circuit arrangements are already known for solvin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/56
CPCH05B45/37H05B45/14H05B45/18
Inventor C.古斯H.格拉夫
Owner ZKW GRP GMBH