High-precision illumination detection circuit
A light detection and high-precision technology, which is applied in the direction of measuring circuits and photometry using electric radiation detectors, can solve problems such as driving safety troubles, and achieve the effects of ensuring driving safety, high detection precision, and high control precision
Inactive Publication Date: 2015-04-15
CHENGDU HONGSHAN TECH
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Problems solved by technology
Especially when the weather changes suddenly, the light suddenly becomes very dark. In the daytime, the street lights have not yet turned on, and the dim light will bring great trouble to driving safety, especially in the road section with heavy traffic.
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[0018] like figure 1 The light detection circuit with high precision shown includes a thermistor R1, an operational amplifier A1 and an operational amplifier A2, one end of the thermistor R1 is grounded, and the other end is connected to the inverting input terminal of the operational amplifier A1, And the two ends of the thermistor R1 are connected in parallel with a resistor R2; the output terminal of the operational amplifier A1 and the reverse input terminal are connected with a resistor R3; the resistor R3 is connected in parallel with a photoresistor R7; the operation A resistor R4 is connected between the output terminal of the amplifier A1 and the inverting input terminal of the operational amplifier A2; a resistor R6 is connected between the output terminal of the operational amplifier A2 and the inverting input terminal; the operational amplifier A1 and the operational amplifier The non-inverting input terminals of the amplifier A2 are all grounded; the inverting inp...
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The invention discloses a high-precision illumination detection circuit. The illumination detection circuit comprises a thermistor R1, an operational amplifier A1 and an operational amplifier A2, wherein one end of the thermistor R1 is grounded, the other end is connected to an inverted input end of the operational amplifier A1, and two ends of the thermistor R1 are in parallel connection with a resistor R2; a resistor R3 is connected between an output end and the inverted input end of the operational amplifier A1; the resistor R3 is in parallel connection with a photoconductive resistor R7; a resistor R4 is connected between the output end of the operational amplifier A1 and an inverted input end of the operational amplifier A2; a resistor R6 is connected between an output end and the inverted input end of the operational amplifier A2; in-phase input ends of both the operational amplifier A1 and the operational amplifier A2 are grounded; and the inverted input end of the operational amplifier A2 is also connected with a filter circuit. The illumination detection circuit has the advantages as follows: turning on and turning off of street lamps are controlled according to the light intensity, the driving safety is guaranteed, the circuit is provided with temperature compensation, and the detection precision is high.
Description
technical field [0001] The invention relates to an illumination monitoring circuit, and more specifically relates to an illumination detection circuit with high precision. Background technique [0002] When controlling the switch of lights on both sides of the road, the general method is to use the control circuit to switch it regularly. However, when spring, summer, autumn and winter alternate or when the weather changes suddenly, the changes in light are difficult to figure out. Especially when the weather changes suddenly, the light suddenly becomes very dark. During the day, the street lights have not yet turned on, and the dim light will bring great trouble to driving safety, especially in the road section with heavy traffic. Contents of the invention [0003] The invention provides a light detection circuit with high precision, which controls the switch of street lamps according to the intensity of light to ensure driving safety, and is equipped with temperature com...
Claims
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IPC IPC(8): G01J1/46
Inventor 黄友华
Owner CHENGDU HONGSHAN TECH