Halogen lamp radiation intensity adjusting circuit

Abstract

The utility model relates to a halogen lamp radiation intensity adjusting circuit which comprises a comparison circuit module, an adder module and an adjusting module. The comparison circuit module comprises a first comparator and a second comparator, the output end of the first comparator is connected to the input end of the summator module through a first resistor, and the output end of the second comparator is connected to the input end of the summator module through a second resistor. The adder module comprises a first operational amplifier, a first pull-down resistor and a feedback resistor, the first pull-down resistor and the output of the comparison circuit module are connected to the in-phase end of the first operational amplifier, and the anti-phase end of the first operational amplifier is connected with the output end of the first operational amplifier through the feedback resistor. The adjusting module comprises a socket, an NMOS tube and a halogen lamp, the grid electrode of the NMOS tube is connected with the output end of the adder module and the + 5V output pin of the socket, and the drain electrode of the NMOS tube is connected with one end of the halogen lamp. Compared with the prior art, the device has the advantages of simple structure, high practicability, high stability and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to lighting technical field especially is related to a halogen lamp radiation intensity adjusting circuit. BACKGROUND

[0002] In the infrared system, halogen lamp has the remarkable advantage because of low cost and wide spectral range, is a kind of commonly used light source selection.Halogen lamp can provide relatively uniform illumination, and can cover the wide wavelength range, this is very advantageous for some infrared detection applications.However, halogen lamp also has certain shortcomings, especially in the long-term use process, the high heat generated can have negative impact on the stability of system.Because halogen lamp generates a large amount of heat when working, can lead to the light source brightness decay speed to accelerate, thereby affecting the overall performance of infrared detection system.Therefore, how to adjust the radiation intensity of halogen lamp, makes the radiation intensity of halogen lamp stable in long-term use is the technical problem to be solved. CONTENT OF UTILITY MODEL

[0003] The utility model discloses a kind of halogen lamp radiation intensity adjusting circuits to overcome the defects of the above prior art, by comparing circuit module real-time comparison light intensity sensor detected halogen lamp radiation intensity and preset standard voltage, and camera collected halogen lamp light intensity change and preset standard voltage, can accurately control the radiation intensity of halogen lamp, so that it remains stable.

[0004] The purpose of the utility model can be realized by the following technical solutions:

[0005] According to an aspect of the utility model, a kind of halogen lamp radiation intensity adjusting circuit is provided, characterized in that, the circuit includes comparison circuit module, adder module and adjusting module;

[0006] The comparison circuit module includes first comparator and second comparator, the output of first comparator is connected to the input of adder module by first resistance, the output of second comparator is connected to the input of adder module by second resistance;

[0007] The adder module includes first operational amplifier, first pull-down resistance and feedback resistance, first pull-down resistance and the output of comparison circuit module are connected to the non-inverting terminal of first operational amplifier, the inverting terminal of first operational amplifier is connected with its output by feedback resistance;

[0008] The adjusting module includes socket, NMOS tube and halogen lamp, the gate of NMOS tube is connected with the output of adder module and the +5V output pin of socket, the drain of NMOS tube is connected with one end of halogen lamp.

[0009] Further, the non-inverting terminal of the first comparator is connected with a preset standard voltage, and the inverting terminal is connected with the output terminal of the light intensity sensor.

[0010] Further, the non-inverting terminal of the second comparator is connected with a preset standard voltage, and the inverting terminal is connected with the output terminal of the camera curve intensity processing module.

[0011] Further, the positive power supply pins of the first comparator and the second comparator are connected with the +5V output pin of the socket.

[0012] Further, the negative power supply pins of the first comparator and the second comparator are connected with the -5V output pin of the socket.

[0013] Further, the adder module further comprises a second pull-down resistor connected to the inverting terminal of the first operational amplifier.

[0014] Further, the positive power supply pin and the negative power supply pin of the first operational amplifier are connected with the socket respectively.

[0015] Further, the positive power supply pin and the negative power supply pin of the first operational amplifier are replaced according to the requirement of the adjustment speed of the halogen lamp radiation intensity, and the corresponding socket pins are replaced.

[0016] Further, the other end of the halogen lamp is connected with the socket.

[0017] Further, the resistance values of the first resistor, the second resistor, the first pull-down resistor, the second pull-down resistor and the feedback resistor are the same.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] (1) Guarantee the stability of halogen lamp radiation intensity: through the comparison circuit module, the halogen lamp radiation intensity detected by the light intensity sensor and the preset standard voltage are compared in real time, and the halogen lamp light intensity change collected by the camera and the preset standard voltage are compared, the radiation intensity of the halogen lamp can be accurately controlled, so that it remains stable, thereby prolonging the service life of the halogen lamp and improving the overall performance of the infrared detection system.

[0020] (2) Wide application range: the adder module and the adjustment module in the circuit can change the gate voltage of the NMOS tube by adjusting the pin voltage of the socket according to actual demand, thereby controlling the drain current of the halogen lamp and realizing flexible adjustment of the halogen lamp radiation intensity, meeting the demand of different application scenarios.

[0021] (3) Simple structure and easy maintenance: the circuit structure is simple, easy to realize and the components are independent and easy to maintain. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a halogen lamp radiation intensity adjustment circuit diagram.

[0023] Figure 2 Block diagram of halogen lamp radiation intensity adjustment logic framework.

[0024] The figure mark description: U1A, first comparator; U1B, second comparator; U2A, first operational amplifier; Q1, NMOS tube; J1, socket; R5, halogen lamp; R1, first resistance; R2, second resistance; R3, first pull-down resistance; R4, feedback resistance; R6, second pull-down resistance; Uref, preset standard voltage; Ui1, light intensity sensor output voltage; Ui2, camera output voltage; Uo1, first comparison voltage; Uo2, second comparison voltage. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0026] As Figure 1 shown, a halogen lamp radiation intensity adjustment circuit, characterized in that the circuit comprises a comparison circuit module, an adder module and an adjustment module;

[0027] The comparison circuit module comprises a first comparator U1A and a second comparator U1B, and the output end of the first comparator U1A is connected to the input end of the adder module through a first resistance R1, and the output end of the second comparator U1B is connected to the input end of the adder module through a second resistance R2.

[0028] The adder module comprises a first operational amplifier U2A, a first pull-down resistance R3 and a feedback resistance R4, the first pull-down resistance R3 and the output of the comparison circuit module are connected to the non-inverting terminal of the first operational amplifier U2A, and the inverting terminal of the first operational amplifier U2A is connected to its output end through the feedback resistance R4.

[0029] The adjustment module comprises a socket J1, an NMOS tube Q1 and a halogen lamp R5, the gate of the NMOS tube Q1 is connected to the output end of the adder module and the +5V output pin of the socket J1, and the drain of the NMOS tube Q1 is connected to one end of the halogen lamp R5.

[0030] The non-inverting terminal of the first comparator U1A is connected to the output end of the light intensity sensor.

[0031] The non-inverting terminal of the second comparator U1B is connected to the output end of the camera curve intensity processing module.

[0032] The positive power supply pins of the first comparator U1A and the second comparator U1B are connected to the +5V output pin of the socket J1.

[0033] The negative power supply pins of the first comparator U1A and the second comparator U1B are connected to the -5V output pin of the socket J1.

[0034] The adder module also includes a second pull-down resistor R6, which is connected to the inverting input of the first operational amplifier U2A.

[0035] The positive and negative power supply pins of the first operational amplifier U2A are connected to socket J1, respectively.

[0036] The positive and negative power supply pins of the first operational amplifier U2A should be replaced with the corresponding socket J1 pins according to the speed requirements for adjusting the radiation intensity of the halogen lamp R5.

[0037] The other end of the halogen lamp R5 is connected to the socket J1.

[0038] The first resistor R1, the second resistor R2, the first pull-down resistor R3, the second pull-down resistor R6, and the feedback resistor R4 have the same resistance value.

[0039] like Figure 2 As shown, in the application of the halogen lamp radiation intensity adjustment circuit, the light intensity sensor continuously detects the radiation intensity of the halogen lamp R5, and the detection result is the light intensity sensor output voltage Ui1. Simultaneously, the camera acquires the light intensity changes of the halogen lamp R5, obtaining the geometric mean curve of radiation, and outputs the camera output voltage Ui2. The first comparator U1A compares the light intensity sensor output voltage Ui1 with a preset standard voltage Uref to obtain a first comparison voltage Uo1. When the light intensity sensor output voltage Ui1 is higher than the preset standard voltage Uref, the first comparator U1A outputs a negative voltage; when the light intensity sensor output voltage Ui1 is lower than the preset standard voltage Uref, the first comparator U1A outputs a positive voltage. The second comparator U1B compares the camera output voltage Ui2 with the preset standard voltage Uref to obtain a second comparison voltage Uo2. When the light intensity sensor output voltage Ui1 is higher than the preset standard voltage Uref, the first comparator U1A outputs a negative voltage; when the camera output voltage Ui2 is lower than the preset standard voltage Uref, the second comparator U2A outputs a positive voltage.

[0040] The first comparison voltage Uo1 and the second comparison voltage Uo2 are connected to the adder module. When both the first comparison voltage Uo1 and the second comparison voltage Uo2 are negative, the adder module outputs a negative voltage; when one of the first comparison voltages Uo1 and the second comparison voltage Uo2 is positive and the other is negative, the adder module outputs 0; when both the first comparison voltage Uo1 and the second comparison voltage Uo2 are positive, the adder outputs a positive voltage.

[0041] The output voltage of the adder module and the preset voltage are the gate voltage of the NMOS tube Q1, thereby controlling the drain current of the NMOS tube Q1. According to the requirement of the speed of the radiation intensity adjustment, the working voltage of the adder module is selected, when the fast adjustment is required, the large working voltage is selected, and when the slow adjustment is required, the small working voltage is selected. In the embodiment, the positive power supply pin of the first operational amplifier U2A is connected to the +1V output pin of the socket J1, and the negative power supply pin of the first operational amplifier U2A is connected to the -1V output pin of the socket J1.

[0042] The above merely describes the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A halogen lamp radiation intensity regulating circuit, characterized by, The circuit comprises a comparison circuit module, an adder module and an adjusting module; The comparison circuit module comprises a first comparator (U1A) and a second comparator (U1B), and the output of the first comparator (U1A) is connected to the input of the adder module through a first resistor (R1), and the output of the second comparator (U1B) is connected to the input of the adder module through a second resistor (R2); The adder module comprises a first operational amplifier (U2A), a first pull-down resistor (R3) and a feedback resistor (R4), the output of the comparison circuit module and the first pull-down resistor (R3) are connected to the non-inverting terminal of the first operational amplifier (U2A), and the inverting terminal of the first operational amplifier (U2A) is connected to the output thereof through the feedback resistor (R4); The adjusting module comprises a socket (J1), an NMOS tube (Q1) and a halogen lamp (R5), the gate of the NMOS tube (Q1) is connected to the output of the adder module and the +5V output pin of the socket (J1), and the drain of the NMOS tube (Q1) is connected to one end of the halogen lamp (R5).

2. A halogen lamp intensity regulating circuit as claimed in claim 1, characterized in that The non-inverting terminal of the first comparator (U1A) is connected to a preset standard voltage, and the inverting terminal is connected to the output of the light intensity sensor.

3. A halogen lamp intensity regulating circuit as claimed in claim 1, characterized in that The non-inverting terminal of the second comparator (U1B) is connected to a preset standard voltage, and the inverting terminal is connected to the output of the camera curve intensity processing module.

4. A halogen lamp intensity regulating circuit as claimed in claim 1, characterized in that The positive power supply pins of the first comparator (U1A) and the second comparator (U1B) are connected to the +5V output pin of the socket (J1).

5. A halogen lamp intensity regulating circuit as claimed in claim 1, characterized in that, The negative power supply pins of the first comparator (U1A) and the second comparator (U1B) are connected to the -5V output pin of the socket (J1).

6. A halogen lamp intensity regulating circuit as claimed in claim 1, characterized in that, The adder module further comprises a second pull-down resistor (R6) connected to the inverting terminal of the first operational amplifier (U2A).

7. A ballast circuit for a halogen lamp as defined in claim 1, characterized in that The positive power supply pin and the negative power supply pin of the first operational amplifier (U2A) are connected to the socket (J1) respectively.

8. A halogen lamp intensity regulating circuit as claimed in claim 7, characterized in that, The positive power supply pin and the negative power supply pin of the first operational amplifier (U2A) are replaced according to the radiation intensity adjusting speed requirement of the halogen lamp (R5).

9. A ballast circuit for a halogen lamp as defined in claim 1, characterized in that The other end of the halogen lamp (R5) is connected to the socket (J1).

10. A halogen lamp intensity regulating circuit as claimed in claim 1, characterized in that, The first resistor (R1), the second resistor (R2), the first pull-down resistor (R3), the second pull-down resistor (R6) and the feedback resistor (R4) have the same resistance.

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