CN210928047U

CN210928047U - Circuit with adjustable light intensity and frequency

Info

Publication number: CN210928047U
Application number: CN201922403996.1U
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: 2020-07-03
Anticipated expiration: 2029-12-27

Abstract

A circuit with adjustable light intensity and frequency comprises a light intensity receiving device and a self-excited oscillator, wherein the light intensity receiving device is a solar battery, the self-excited oscillator comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, one end of the first resistor R3578, the second resistor R2, the first resistor R1 and the fourth resistor R4 are connected to the rear of an adjustable resistor potentiometer, an emitter of the first transistor T1 is grounded, a first capacitor C1 is connected between the other ends of the first resistor R and the second resistor R4, a first output is formed between a collector and an emitter of the first transistor T2, the other end of the second resistor R is connected with a base of the second transistor 21, the emitter of the second transistor T2. The circuit can generate better response to both weak light and strong light.

Description

Circuit with adjustable light intensity and frequency

Technical Field

The utility model relates to a circuit, in particular to adopt the light intensity to adjust the circuit of square wave generator output frequency belongs to electron device technical field.

Background

The existing multi-harmonic oscillation circuit generally adopts a storage battery or a 5V direct-current constant-voltage power supply as a driving power supply to generate square waves, corresponding devices need to be controlled to work according to different light intensities in many application occasions (for example, in the field of electric welding, some devices need to be driven to work according to existence of welding light, and corresponding equipment needs to be triggered according to existence of fire light in equipment fire prevention detection).

Disclosure of Invention

An object of the utility model is to overcome the above-mentioned problem that present adoption multivibrator circuit exists in the work of controlling means frequency, provide a circuit of adjustable frequency of light intensity.

In order to realize the purpose of the utility model, the following technical proposal is adopted: a circuit with adjustable light intensity and frequency comprises a light intensity receiving device and a self-excited oscillator, wherein 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 resistance potentiometer is connected to the anode of the solar cell, the self-excited oscillator comprises a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, one end of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 is connected to the rear of the adjustable resistance potentiometer, the first resistor, the second resistor, the third resistor and the fourth resistor are connected in parallel, the other end of the first resistor is connected to the collector of a first transistor T1, the other end of the third resistor is connected to the base of a first transistor T1, the emitter of the first transistor T1 is grounded, a first capacitor C1 is connected between the other ends of the first resistor and the second resistor, and the collector and the emitter of the first transistor are used as an output one, the other end of the resistor IV is connected with the collector of the transistor II T2, the other end of the resistor II is connected with the base of the transistor II 21, the emitter of the transistor II T2 is grounded, a capacitor I C1 is connected between the other ends of the resistor III and the resistor IV, and the other end of the resistor I, between the collector and the emitter, serves as an output II.

Further, the method comprises the following steps of; the first transistor and the second transistor both adopt patches 9013, the first resistor adopts 1K omega-10K omega, the second resistor adopts 4.7K omega-50K omega, the third resistor adopts 4.7K omega-50K omega, and the fourth resistor adopts 1K omega-10K omega, the first resistor, the second resistor, the third resistor and the fourth resistor are patch resistors, and the adjustable resistor potentiometer is 50K.

The utility model discloses an actively beneficial technological effect lies in: the circuit adopts the amorphous silicon solar cell or the perovskite solar cell as a driving power supply, generates better response to weak light and strong light, and can automatically generate corresponding frequency change along with the light intensity by utilizing light energy as long as a light source is available under the condition of no external power supply. The circuit with adjustable light intensity and frequency can increase or decrease the photoelectric conversion into DC direct voltage along with the intensity of light received by a light intensity receiving device (photocell), and the increase or decrease of the DC direct voltage enables the frequency generated by the self-excited oscillator circuit to change, and can automatically follow the light intensity received by the light intensity receiving device photocell without additional trigger signals to generate corresponding frequency change pulses.

Drawings

Fig. 1 is a circuit 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, in which two arrows indicate solar cells.

Fig. 1 shows two conventional inverter circuits composed of the above electronic components, in which two stages of inverters of high-gain NPN transistors T1 and T2 are connected end to end, and the stages are coupled by capacitors C1 and C2 to form a multivibrator circuit, which is an oscillator that generates square wave output by self-excitation by alternately turning on and off two inverters through resistance-capacitance coupling by using depth positive feedback. 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 multivibrator of fig. 1 has mainly the following two states:

the working state I 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.

And a second working state: since R2 provides base bias such that T2 is conductive, the circuit enters state two. When T2 turns on, the voltage output by collector C of T2 changes from high level to low level close to 0V, and since capacitor C2 provides 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.

The utility model discloses well circuit start-up process is when the circuit just connect the power, and two transistors are all the off-state. 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.

The devices in the circuit can be specifically: two transistors T₁And T₂Respectively, the following steps: the T1 patch is 9013, and the T2 patch is 9013; 4 chip resistors with resistance values respectively: r₁(1K Ω to 10K Ω), R2 (4.7K Ω to 50K Ω), R3 (4.7K Ω to 50K Ω), R4 (1K Ω to 10K Ω), and 2 chip capacitors, each of which is: c1 (0.1 muF-1 muF), C2 (0.1 muF-1 muF), an amorphous silicon 5V photocell, the model is as follows: SC-3514, 1 adjustable resistance potentiometer of paster, model: 3313J-1-503E 50K. If the frequency is changed, the capacities of C1 and C2 and the resistance values of R1, R2, R3 and R4 can be adjusted.

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. A circuit with adjustable frequency of light intensity comprises a light intensity receiving device and a self-excited oscillator, and is 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 a resistor I R1, a resistor II R2, a resistor III R3 and a resistor IV R4, one end of the resistor I R1, the resistor II R2, the resistor III R3 and the resistor IV R4 is connected to the rear of the adjustable resistor potentiometer, the resistor I, the resistor II, the resistor III and the resistor IV are connected in parallel, the other end of the resistor I is connected to the collector of a transistor I T1, the other end of the resistor III is connected to the base of the transistor I T1, the emitter of the transistor I T1 is grounded, a capacitor I C1 is connected between the other ends of the resistor I and the emitter, the other end of the resistor IV is connected to the collector of the transistor II T2, the other end of the second resistor is connected with the base of the second transistor 21, the emitter of the second transistor T2 is grounded, a first capacitor C1 is connected between the other ends of the third resistor and the fourth resistor, and the other end of the first resistor, between the collector and the emitter, serves as an output II.

2. The circuit of claim 1, wherein: the first transistor and the second transistor both adopt patches 9013, the first resistor adopts 1K omega-10K omega, the second resistor adopts 4.7K omega-50K omega, the third resistor adopts 4.7K omega-50K omega, and the fourth resistor adopts 1K omega-10K omega, the first resistor, the second resistor, the third resistor and the fourth resistor are patch resistors, and the adjustable resistor potentiometer is 50K.