Cost-reducing efficiency-increasing infrared transmitting tube control circuit

Abstract

The utility model discloses a cost-reducing efficiency-increasing infrared transmitting tube control circuit, and relates to the field of infrared sensors. The control circuit comprises a driving power supply; a plurality of infrared emission modules, wherein each infrared emission module is respectively connected with the driving power supply and the control signal end of the single-chip microcomputer; each infrared emission module comprises a first infrared emission tube, a second infrared emission tube and an infrared emission control unit which are connected in sequence, and the infrared emission control unit comprises an NPN triode; when the control signal of the single-chip microcomputer is at a high level, the NPN triode is switched on, and the first infrared transmitting tube and the second infrared transmitting tube work; when the control signal of the single-chip microcomputer is at a low level, the NPN triode is cut off, and the first infrared transmitting tube and the second infrared transmitting tube do not work. According to the infrared transmitting tube control circuit capable of reducing cost and increasing efficiency, the two infrared transmitting tubes are controlled to work through one NPN triode, the circuit cost is reduced, when the infrared transmitting tubes do not work, a single chip microcomputer controls signals to output low level, and the static power consumption of a product is reduced.

Description

Technical Field

[0001] The utility model relates to the field of infrared sensors, and particularly to a cost-reducing and efficiency-increasing infrared emitting tube control circuit. Background Technique

[0002] The existing infrared emitting tube control circuit is as Figure 1 shown, and its basic working principle is as follows: IR_OUT is the control signal of the single-chip microcomputer. When the infrared emitting tube needs to work, this signal will output a low level. At this time, the triode Vbe < -1.2V enters the saturation state, which is equivalent to closing the switch, and 8 infrared emitting tubes start to work.

[0003] However, this circuit has the following defects:

[0004] 1. Each infrared emitting tube requires 1 triode for switch control, and the circuit cost is relatively high;

[0005] 2. The infrared emitting tube has a large power, and the load surges instantaneously during operation, resulting in fluctuations in the 3.3V power supply. Since there are other components in the device that need to be powered by 3.3V, this fluctuation is likely to affect the operation of other components. In order to reduce the power supply fluctuation, a current-limiting resistor ( Figure 1 the circuit in selects 15 ohms) must be connected in the drive circuit to limit the power of the infrared emitting tube, sacrificing product performance to increase stability;

[0006] 3. The PNP transistor is selected for the switch triode. When the infrared emitting tube is not working, the IR_OUT control signal needs to output a high level, increasing the static power consumption of the device. Summary of the Invention

[0007] The technical problem to be solved by the utility model is to provide a cost-reducing and efficiency-increasing infrared emitting tube control circuit, which controls the operation of two infrared emitting tubes through one NPN triode, reduces the circuit cost, and when the infrared emitting tube is not working, the single-chip microcomputer control signal outputs a low level, reducing the static power consumption of the product.

[0008] The utility model is implemented as follows:

[0009] Drive power supply;

[0010] A plurality of infrared emission modules, each infrared emission module is respectively connected to the drive power supply and the single-chip microcomputer control signal terminal;

[0011] Each of the infrared emission modules includes a first infrared emission tube, a second infrared emission tube, and an infrared emission control unit connected in sequence. The infrared emission control unit includes an NPN triode. When the control signal of the single-chip microcomputer is at a high level, the NPN triode conducts, and the first infrared emission tube and the second infrared emission tube work. When the control signal of the single-chip microcomputer is at a low level, the NPN triode cuts off, and the first infrared emission tube and the second infrared emission tube do not work.

[0012] Further, the infrared emission control unit further includes a first current-limiting resistor, and the collector of the NPN triode is connected to the second infrared emission tube through the first current-limiting resistor.

[0013] Further, the resistance value of the first current-limiting resistor is 4.3 ohms.

[0014] Further, the infrared emission control unit further includes a second current-limiting resistor, and the base of the NPN triode is connected to the control signal terminal of the single-chip microcomputer through the second current-limiting resistor.

[0015] Further, a filter energy storage module is further included, which is connected to the driving power supply.

[0016] Further, the filter energy storage module includes a first capacitor, a second capacitor, and a third capacitor connected in parallel, with one end connected to the driving power supply and the other end grounded.

[0017] Further, the first capacitor is a ceramic capacitor, and the second capacitor and the third capacitor are electrolytic capacitors.

[0018] Further, the model of the NPN triode is FHT8050.

[0019] Further, the voltage of the driving power supply is 5V.

[0020] Further, the model of the single-chip microcomputer is STM32F091RBT6.

[0021] The technical solution of the present utility model has at least the following advantages:

[0022] By controlling two infrared emission tubes to work through each NPN triode, the circuit cost is reduced, and when the infrared emission tubes do not work, the control signal output of the single-chip microcomputer is at a low level, reducing the static power consumption of the product. Description of the Drawings

[0023] The following further describes the present utility model with reference to the drawings in conjunction with the embodiments.

[0024] Figure 1 It is a schematic diagram of an infrared emission tube control circuit in the prior art.

[0025] Figure 2This is a schematic diagram of the overall structure of a cost-reducing and efficiency-increasing infrared emitter control circuit according to an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of a cost-reducing and efficiency-increasing infrared emitter control circuit according to an embodiment of the present invention. Specific embodiments

[0027] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings and specific embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0029] The overall idea of the technical solutions in the embodiments of the present invention is as follows:

[0030] Optimize and improve the defects of the original control circuit: By deleting components in the drive circuit, optimize the circuit cost; replace the drive power supply, reduce the impact on the operation of other components of the device during the emission instant, and remove the power limit on the infrared emitter.

[0031] Please refer to Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a cost-reducing and efficiency-increasing infrared emitter control circuit 100, including:

[0032] Drive power supply 1;

[0033] Multiple infrared emission modules 2, each infrared emission module 2 is respectively connected to the drive power supply 1 and the control signal terminal of the single-chip microcomputer 500 (such as the single-chip microcomputer of model STM32F091RBT6);

[0034] Each of the infrared emission modules 2 includes a first infrared emission tube 21, a second infrared emission tube 22, and an infrared emission control unit 20 connected in sequence. The infrared emission control unit 20 includes an NPN triode (such as an NPN triode of model FHT8050). When the control signal of the single-chip microcomputer 500 is at a high level, the NPN triode conducts, and the first infrared emission tube 21 and the second infrared emission tube 22 work. When the control signal of the single-chip microcomputer 500 is at a low level, the NPN triode cuts off, and the first infrared emission tube 21 and the second infrared emission tube 22 do not work.

[0035] As Figure 2 shown, in this embodiment, there are four infrared emission modules 2, and eight infrared emission tubes (LED1 - LED8) are respectively controlled by 4 NPN triodes (Q16, Q17, Q18, Q19). The number of infrared emission modules 2 can also be increased or decreased according to specific implementation requirements. By designing each triode to drive two infrared emission tubes, the circuit cost is reduced (if one triode is used to drive a larger number of infrared emission tubes, there are requirements for the Ic of the triode and the driving power supply, which will instead increase the cost). By replacing the PNP triode with an NPN triode, when the infrared emission tubes do not work, the control signal output of the single-chip microcomputer 500 can be at a low level, reducing the static power consumption of the product. In this embodiment, all the infrared emission control units 20 are connected to the control signal IR_OUT to achieve simultaneous operation or non-operation of all the infrared emission tubes. Different control signals can also be set for different infrared emission control units 20 according to requirements to achieve individual control of each path of infrared emission tubes. However, the first infrared emission tube 21 and the second infrared emission tube 22 controlled by the same NPN triode can only work or not work simultaneously.

[0036] As Figure 2 shown, in a possible implementation manner, the infrared emission control unit 20 further includes a first current-limiting resistor (such as Figure 2 R133, R125, R126, R127 in

[0037] ). The collector of the NPN triode is connected to the second infrared emission tube 22 through the first current-limiting resistor. The resistance value of the first current-limiting resistor can be 4.3 ohms, and at the same time, an infrared emission tube with higher efficiency is selected. Figure 2 R129, R130, R132, R132 in

[0038] In a possible implementation manner, it further includes a filtering and energy storage module 3, which is connected to the driving power supply 1. As Figure 2As shown, the filtering energy storage module 3 may include a first capacitor C7, a second capacitor CD11, and a third capacitor CD13 connected in parallel. One end of C7, CD11, and CD13 is connected to the drive power supply, and the other end is grounded (GND). The first capacitor C7 is a ceramic capacitor, and the second capacitor CD11 and the third capacitor CD13 are electrolytic capacitors. Compared with Figure 1 adding a parallel electrolytic capacitor can further reduce voltage fluctuations.

[0039] In a possible implementation, the voltage VCC_IR of the drive power supply 1 is 5V. Modifying the drive power supply 1 to 5V can reduce the impact of power supply fluctuations during the instant when the infrared emitting diode works on other components, and increase the stability of product operation. At the same time, it can also lift the limitation of the current-limiting resistor or replace the infrared emitting diode with a larger emission power, effectively improving the product performance, achieving multiple benefits with one action.

[0040] The embodiments of the present utility model have the following advantages:

[0041] 1. Each NPN transistor controls two infrared emitting diodes to work, reducing the circuit cost. When the infrared emitting diodes are not working, the single-chip microcomputer control signal outputs a low level, reducing the static power consumption of the product.

[0042] 2. Modifying the drive power supply to 5V can reduce the impact of power supply fluctuations during the instant when the infrared emitting diode works on other components, and increase the stability of product operation. At the same time, it can also lift the limitation of the current-limiting resistor or replace the infrared emitting diode with a larger emission power, effectively improving the product performance, achieving multiple benefits with one action.

[0043] Although the specific implementation manners of the present utility model are described above, those skilled in the art of this technology should understand that the specific embodiments we described are illustrative rather than used to limit the scope of the present utility model. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present utility model should all be covered by the scope protected by the claims of the present utility model.

Claims

1. A cost-reducing and efficiency-enhancing infrared emitting tube control circuit, characterized in that: include: Driving power supply; A plurality of infrared transmitting modules, each of which is connected to a driving power supply and a control signal terminal of a single chip microcomputer; Each of the infrared emitting modules includes a first infrared emitting tube, a second infrared emitting tube and an infrared emitting control unit connected in sequence, and the infrared emitting control unit includes an NPN transistor; when the microcontroller control signal is at a high level, the NPN transistor is turned on, and the first infrared emitting tube and the second infrared emitting tube work; when the microcontroller control signal is at a low level, the NPN transistor is turned off, and the first infrared emitting tube and the second infrared emitting tube do not work.

2. The cost-reducing and efficiency-enhancing infrared emitting tube control circuit according to claim 1, characterized in that: The infrared emission control unit also includes a first current limiting resistor, and the collector of the NPN transistor is connected to the second infrared emission tube through the first current limiting resistor.

3. The cost-reducing and efficiency-enhancing infrared emitting tube control circuit according to claim 2 is characterized in that: The resistance of the first current limiting resistor is 4.3 ohms.

4. A cost-reducing and efficiency-enhancing infrared emitting tube control circuit according to claim 1 or 2, characterized in that: The infrared emission control unit also includes a second current limiting resistor, and the base of the NPN transistor is connected to the control signal terminal of the single chip computer through the second current limiting resistor.

5. The cost-reducing and efficiency-enhancing infrared emitting tube control circuit according to claim 1, characterized in that: It also includes a filtering energy storage module connected to the driving power supply.

6. The cost-reducing and efficiency-enhancing infrared emitting tube control circuit according to claim 5, characterized in that: The filtering energy storage module comprises a first capacitor, a second capacitor and a third capacitor connected in parallel, one end of which is connected to a driving power source and the other end is grounded.

7. The cost-reducing and efficiency-enhancing infrared emitting tube control circuit according to claim 6, characterized in that: The first capacitor is a ceramic capacitor, and the second capacitor and the third capacitor are electrolytic capacitors.

8. The cost-reducing and efficiency-enhancing infrared emitting tube control circuit according to claim 1, characterized in that: The model of the NPN transistor is FHT8050.

9. The cost-reducing and efficiency-enhancing infrared emitting tube control circuit according to claim 1, characterized in that: The voltage of the driving power supply is 5V.

10. The cost-reducing and efficiency-enhancing infrared emitting tube control circuit according to claim 1, characterized in that: The model of the single chip microcomputer is STM32F091RBT6.

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