CN210835493U

CN210835493U - Drive circuit module of light intensity adjustable diaphragm

Info

Publication number: CN210835493U
Application number: CN201922399952.6U
Authority: CN
Inventors: 王晓红; 张泽豪
Original assignee: Henan Dezhu Electronic Technology Co ltd
Current assignee: Henan Dezhu Electronic Technology Co ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-06-23
Anticipated expiration: 2029-12-27

Abstract

The utility model provides a drive circuit module of adjustable diaphragm of light intensity, includes light intensity receiving device, self-excited oscillator, LED light valve, light intensity receiving device be solar cell, be connected with adjustable resistance potentiometre on solar cell's positive pole, self-excited oscillator include adjustable resistance R1, two R2 of adjustable resistance, three R3 of adjustable resistance, four R4 of adjustable resistance, adjustable resistance R1, two R2 of adjustable resistance, three R3 of adjustable resistance, the one end of four R4 of adjustable resistance is connected behind the adjustable resistance potentiometre, connect LED light valve A between the collecting electrode of transistor one and the projecting pole, the collecting electrode of two T2 of transistor is connected to the other end of four R4 of adjustable resistance, the base of two 21 of transistor is connected to the other end of two R2 of adjustable resistance, the projecting pole of two T2 of transistor is grounded. The circuit module is simple and low in cost.

Description

Drive circuit module of light intensity adjustable diaphragm

Technical Field

The utility model relates to a drive circuit of diaphragm, in particular to drive circuit module of liquid crystal light valve belongs to electron technical field.

Background

The current liquid crystal light valve can be divided into two types: firstly, a polaroid is used, and different mode selections (TN, OCB and the like) can be made according to the response time requirement by using a common liquid crystal light valve with the voltage being converted between 50% light transmittance and light transmittance close to 0; and the PDLC light valve without a polaroid has high driving voltage (dozens of volts) and can switch between the light transmittance close to 100 percent and the scattering light transmittance (ground glass effect) of about 50 percent. Therefore, the current liquid crystal light valve has higher driving voltage, and the adjusting circuit of the luminous flux is complex and has high cost.

Disclosure of Invention

An object of the utility model is to overcome the complicated, with high costs problem of present liquid crystal light valve drive circuit, provide a drive circuit module of the adjustable diaphragm of light intensity.

In order to realize the purpose of the utility model, the following technical proposal is adopted: a driving circuit module of a light intensity adjustable diaphragm comprises a light intensity receiving device, a self-excited oscillator and an LED light valve, wherein the light intensity receiving device is a solar battery, the solar battery is an amorphous silicon solar battery or a perovskite solar battery, an adjustable resistance potentiometer is connected to the anode of the solar battery, the self-excited oscillator comprises an adjustable resistor I R1, an adjustable resistor II R2, an adjustable resistor III R3 and an adjustable resistor IV R4, the adjustable resistor I R1, the adjustable resistor II R2, the adjustable resistor III R3 and one end of the adjustable resistor IV R4 are connected behind the adjustable resistance potentiometer, the adjustable resistor I R1, the adjustable resistor II R2, the adjustable resistor III R3 and the adjustable resistor IV R4 are connected in parallel, the other end of the adjustable resistor I R1 is connected to a collector of a transistor I T1, the other end of the adjustable resistor III R3 is connected to a base of the transistor I T1, the emitter of the first transistor T1 is grounded, the first capacitor C1 is connected between the other ends of the first adjustable resistor R1 and the second adjustable resistor R2, the LED light valve A is connected between the collector of the first transistor and the emitter, the other end of the fourth adjustable resistor R4 is connected with the collector of the second transistor T2, the other end of the second adjustable resistor R2 is connected with the base of the second transistor 21, the emitter of the second transistor T2 is grounded, the first capacitor C1 is connected between the other ends of the third adjustable resistor R3 and the fourth adjustable resistor R4, and the LED light valve B is connected between the collector of the first transistor and the emitter.

Furthermore, the first transistor T1 and the second transistor T2 both adopt patches 9013, the first adjustable resistor R1 adopts 1K Ω -10K Ω, the second adjustable resistor R2CAIY adopts 4.7K Ω -50K Ω, the third adjustable resistor R3 adopts 4.7K Ω -50K Ω, the fourth adjustable resistor R4 adopts 1K Ω -10K Ω, the first adjustable resistor R1, the second adjustable resistor R2, the third adjustable resistor R3 and the fourth adjustable resistor R4 are patch adjustable resistors, and the adjustable resistor potentiometer is 50K.

The utility model discloses an actively beneficial technological effect lies in: the circuit module is simple and low in cost, and the LCD light valve (diaphragm) can be driven to realize the change of luminous flux by combining the self-excited oscillator and the solar cell.

Drawings

Fig. 1 is a schematic diagram of the present invention.

Detailed Description

In order to explain the utility model more fully, the utility model provides an implementation example. These examples are merely illustrative of the present invention and do not limit the scope of the present invention.

The present invention will be explained in further detail with reference to the accompanying drawings, wherein a is the LED light valve A, B is the LED light valve B, i.e. the light diaphragm described in the present application.

As shown in the accompanying drawings, fig. 1 shows that the electronic components form two conventional inverter circuits, a first high-gain NPN-type transistor T1 and a second transistor T2 are connected end to end, the two stages are coupled by capacitors C1 and C2 to form a multivibrator circuit, and the multivibrator is an oscillator which utilizes depth positive feedback, and alternately turns on and off two inverters through resistance-capacitance coupling, so that square wave output is generated by self excitation. If the frequency is changed, the capacities of C1 and C2 and the resistance values of R1, R2, R3 and R4 can be adjusted.

The driving module has the following two states:

the working state is as follows: when T1 is turned off, the supply voltage E is equal to the voltage U R1 applied to R1 and the voltage Uce applied between the collector C and emitter E of the T1 transistor, i.e., E U R1 + Uce. When T1 is turned on, the collector voltage of T1 is close to 0V, the output voltage is low, because the resistance between the collector C and the emitter E of the T1 transistor is much larger than that of R1, the power supply voltage E ≈ Uce, at this time, the capacitor C1 discharges current through the collector C and the emitter E of R2 and T1, and since the capacitor C1 provides a reverse bias voltage, the T2 is turned off, and the collector C output voltage of T2 is high. A square wave pulse is generated. The C2 current charges through R4 and T1 base b and emitter e, which continues until the C1 discharge is complete.

The second working state is as follows: since R2 provides base bias such that T2 is conductive, the circuit enters state two. When T2 turns on, the voltage output by the collector C of T2 changes from high level to low level close to 0V, and since the capacitor C2 provides a reverse bias voltage, T1 is momentarily turned off, and T1 is turned off, so that the collector voltage of T1 rises to high level.

C1 is charged by current through R1 and T2 base b and emitter e, C2 flows through R3 and T2 collector C and emitter e are discharged, and T1 is cut off due to the reverse bias voltage provided by capacitor C2. A square wave pulse is generated.

This state continues until C2 is discharged, and since R3 provides a bias voltage to the base of T1, T1 turns on: the circuit enters state one.

Circuit start-up procedure when the circuit is just connected to power, both transistors are off. However, when the base voltages of the two transistors rise together, one of the transistors must turn on preemptively because it is not possible to delay the turn on of each transistor to be the same during the transistor fabrication process due to the junction capacitance, body resistance and other parameters of the transistors. The circuit then enters one of the states and is guaranteed to oscillate continuously.

For the oscillation period, the duration of state one (output high) is related to R1, C1, and the duration of state two is related to R2, C2. Since R1, R2, C1 and C2 can be freely configured, the amplitude voltage and duty cycle can be freely determined.

However, the duration of each state is determined by the initial state of the capacitor at the start of charging (the voltage across the capacitor), which in turn is related to the amount of discharge in the previous state; the amount of discharge in the previous stage is determined by the resistances R1 and R4 through which the current flows during the discharge process and the duration of the discharge process. In summary, when the circuit is started, it takes a little longer time to charge the capacitor, and the duration of each subsequent stage becomes short and stable.

As a specific embodiment, the device types in the driving module are as follows: composed of two transistors one T₁And a transistor II T₂Respectively, the following steps: the T1 patch is 9013, and the T2 patch is 9013; 4 paster adjustable resistance, the resistance value is respectively: r₁(1K omega-10K omega), R2 (4.7K omega-50K omega), R3 (4.7K omega-50K omega), R4 (1K omega-10K omega), 2 patch capacitors which are respectively C1 (0.1 muF-1 muF) and C2 (0.1 muF-1 muF), wherein the solar cell adopts an amorphous silicon 5V photocell with the model of SC-3514 and an adjustable resistance potentiometer with the model of 3313J-1-503E 50K and 2 LCD light valves (55 mm in length, × in width, 35mm in width, × in thickness and 2.0mm in thickness).

After the embodiments of the present invention have been described in detail, those skilled in the art can clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above claims, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention all fall within the scope of the technical solution of the present invention, and the present invention is not limited to the embodiments of the examples given in the specification.

Claims

1. The utility model provides a drive circuit module of adjustable diaphragm of light intensity, includes light intensity receiving device, self-excited oscillator, LED light valve, its characterized in that: the light intensity receiving device is a solar cell, the solar cell is an amorphous silicon solar cell or a perovskite solar cell, an adjustable resistor potentiometer is connected to the anode of the solar cell, the self-excited oscillator comprises an adjustable resistor I R1, an adjustable resistor II R2, an adjustable resistor III R3, an adjustable resistor IV R4, an adjustable resistor I R1, an adjustable resistor II R2, an adjustable resistor III R3 and one end of an adjustable resistor IV R4 are connected behind the adjustable resistor potentiometer, the adjustable resistor I R1, the adjustable resistor II R2, the adjustable resistor III R3 and the adjustable resistor IV R4 are connected in parallel, the other end of the adjustable resistor I R1 is connected to the collector of a transistor I T1, the other end of the adjustable resistor III R3 is connected to the base of a transistor I T1, the emitter of the transistor I T1 is grounded, a capacitor I1 is connected between the other ends of the adjustable resistor I R1 and the adjustable resistor IV R2, the LED light valve A is connected between the collector and the emitter of the first transistor, the other end of the adjustable resistor four R4 is connected with the collector of the second transistor T2, the other end of the adjustable resistor two R2 is connected with the base of the second transistor 21, the emitter of the second transistor T2 is grounded, the other ends of the adjustable resistor three R3 and the adjustable resistor four R4 are connected with the capacitor one C1, and the LED light valve B is connected between the collector and the emitter of the first transistor.

2. The module of claim 1, wherein: the first transistor T1 and the second transistor T2 both adopt patches 9013, the first adjustable resistor R1 adopts 1K omega-10K omega, the second adjustable resistor R2CAIY4.7K omega-50K omega, the third adjustable resistor R3 adopts 4.7K omega-50K omega, the fourth adjustable resistor R4 adopts 1K omega-10K omega, the first adjustable resistor R1, the second adjustable resistor R2, the third adjustable resistor R3 and the fourth adjustable resistor R4 are patch adjustable resistors, and the adjustable resistor potentiometer is 50K.