Low-power-consumption infrared reflection detection circuit

Abstract

The invention provides a low-power-consumption infrared reflection detection circuit. The low-power-consumption infrared reflection detection circuit comprises a constant-current circuit module, an infrared transmitting tube, an infrared receiving tube, a feedback circuit module and a power supply; the power input end of the constant-current circuit is connected with the power supply, the infrared transmitting tube is connected with the constant-current output end in series, the power supply end of the infrared receiving tube is connected with the constant-current output end, the output end of the infrared receiving tube is connected with the input end of the feedback circuit, and the output end of the feedback circuit is connected with the feedback signal input end of the constant-current circuit. When no human body or no object is close to the infrared transmitting tube, the current of the whole circuit and the current flowing through the infrared transmitting tube can be maintained in a very small quiescent current range, and when the human body or the object is close to the infrared transmitting tube, the quiescent current can be rapidly increased, so that the human body or the object can be reliably sensed; therefore, under the condition that the detection effect is not affected, the static working current can be reduced to the minimum, then the intermittent working mode is added, the average current is reduced in proportion, and finally the purpose of reducing power consumption is achieved.

Description

technical field [0001] The present disclosure relates to the technical field of infrared detection, in particular to an infrared reflection detection circuit with low power consumption. Background technique [0002] In the application of infrared detection, there is an application of reflected signal detection. The circuit is composed of an infrared emitting tube and an infrared receiving tube. In the standby state, the infrared tube needs to emit infrared light all the time. When someone or an object approaches the infrared probe, Due to the existence of light reflection, the infrared receiving tube is turned on due to the induction of infrared light, thereby triggering the relevant circuit or the IO port of the single-chip microcomputer. When the circuit is powered by a battery, the service time of the battery has a great relationship with the power consumption of the detection circuit. If Without the use of power-saving technology, under a certain battery life requirement...

AI Technical Summary

Problems solved by technology

[0002] In the application of infrared detection, there is an application of reflected signal detection. The circuit is composed of an infrared emitting tube and an infrared receiving tube. In the standby state, the infrared tube needs to emit infrared light all the time. When someone or an object approaches the infrared probe, Due to the existence of light reflection, the infrared receiving tube is turned on due to the induction of infrared light, thereby triggering the relevant circuit or the IO port of the single-chip microcomputer. When the circuit is powered by a battery, the service time of the battery has a great relationship with the power consumption of the detection circuit. If Without the use of power-saving technology, under a certain battery life requirement (such as one year), the required battery capacity (such as 35AH) will lead to excessive volume and high price, and eventually the product cannot be mass-produced smoothly.

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