Low-cost square wave generator circuit

Abstract

The utility model provides a low cost square wave generator circuit, including oscillating circuit and square wave output circuit, oscillating circuit includes resistor R1, resistor R2, resistor R3, resistor R4, capacitor C1, capacitor C2, triode Q1 and triode Q2, the base electrode of triode Q1 is connected with the one end of capacitor C2 and one end of resistor R3, the other end of triode Q1 is connected with the other end of capacitor C2. The other end of the capacitor C2 is connected to the collector electrode of the triode Q2 and one end of the resistor R1, the base electrode of the triode Q2 is connected with one end of the capacitor C1 and one end of the resistor R4 at the same time, and the other end of the capacitor C1 is connected to the collector electrode of the triode Q1 and one end of the resistor R2. The low-cost square wave generator circuit provided by the utility model is simple in circuit, meets the requirements of customers, also meets the requirement of reducing the cost, and is relatively simple to process and manufacture.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to a low-cost square wave generator circuit. Background Art

[0002] So far, to achieve PWM circuit control for automobile headlights, an MCU is basically used. The MCU itself is difficult to manufacture and has relatively high requirements for the skills of personnel. At the same time, the use of the MCU is also relatively complex and requires professional technicians to operate, which increases the overall manufacturing cost of the automobile. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the problem that when realizing PWM circuit control for existing automobile headlights, most of them are basically realized by using an MCU on the market, which has relatively high requirements for the skills of personnel. At the same time, the use of the MCU is also relatively complex and requires professional technicians to operate, which increases the overall manufacturing cost of the automobile, and provides a low-cost square wave generator circuit.

[0004] To achieve the above technical purpose and reach the above technical effect, the utility model is realized through the following technical solutions:

[0005] The utility model provides a low-cost square wave generator circuit, including an oscillation circuit and a square wave output circuit. The oscillation circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a triode Q1 and a triode Q2. The base of the triode Q1 is connected to one end of the capacitor C2 and one end of the resistor R3. The other end of the capacitor C2 is connected to the collector of the triode Q2 and one end of the resistor R1. The base of the triode Q2 is simultaneously connected to one end of the capacitor C1 and one end of the resistor R4. The other end of the capacitor C1 is connected to the collector of the triode Q1 and one end of the resistor R2. The square wave circuit includes a triode Q3, a resistor R5 and a resistor R6. One end of the resistor R6 is connected to the collector of Q1 and the other end is connected to the base of the triode Q3. The resistor R5 is connected to the base of Q3.

[0006] Preferably, a filter capacitor C3 is connected to the collector of the triode Q3.

[0007] Preferably, the resistance values of the resistors R1, R2, R3 and R4 are adjustable.

[0008] Preferably, one ends of the resistors R1, R2, R3, R4 and R5 are connected to the +5V power supply.

[0009] In summary, the present utility model provides a low-cost square wave generator circuit, which consists of a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a triode Q1 and a triode Q2 to form an oscillation circuit. When just powered on, since the capacitor is equivalent to a short circuit, it is set that the triode Q1 conducts first. The capacitor C1 is charged through the resistor R4 and the triode Q1, and the triode Q2 is cut off. At this time, the output terminal of the triode Q1 is at a low level, and the triode Q3 is cut off, and the output terminal outputs a high level. The base voltage of the triode Q2 gradually increases as the capacitor C1 is charged (left positive and right negative). At the same time, the capacitor C2 is charged through R1 and the base-emitter of Q1 (left positive and right negative). When the capacitor C1 is charged to 0.7V, the triode Q2 conducts, and the C2 capacitor is charged through R3 and the triode Q2 (right positive and left negative), and Q1 is cut off. At this time, Q1 outputs a high level, the triode Q3 conducts, and the output terminal outputs a low level. At the same time, the capacitor C1 is charged through R2 and the collector-emitter of Q2 (right positive and left negative). Through the alternating conduction of the triode Q1 and the triode Q2, the high and low levels are output, forming a PWM wave output. The present utility model realizes the output of the PWM wave through the oscillation circuit and the square wave output circuit. The circuit is simple. While meeting the requirements of customers, it also meets the need to reduce costs, and the processing and manufacturing are relatively simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings described herein are used to provide a further understanding of the present utility model and form a part of this application. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0011] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0012] The reference numerals in the figure are explained as follows: 1 - oscillation circuit, 2 - square wave output circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0014] Please refer to Figure 1, the present utility model provides a low-cost square wave generator circuit, including an oscillation circuit and a square wave output circuit. The oscillation circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a triode Q1 and a triode Q2. The base of the triode Q1 is connected to one end of the capacitor C2 and one end of the resistor R3. The other end of the capacitor C2 is connected to the collector of the triode Q2 and one end of the resistor R1. The base of the triode Q2 is simultaneously connected to one end of the capacitor C1 and one end of the resistor R4. The other end of the capacitor C1 is connected to the collector of the triode Q1 and one end of the resistor R2. The square wave circuit includes a triode Q3, a resistor R5 and a resistor R6. One end of the resistor R6 is connected to the collector of Q1 and the other end is connected to the base of the triode Q3. The resistor R5 is connected to the base of Q3.

[0015] A filter capacitor C3 is connected to the collector of the triode Q3 to filter out the output clutter signal.

[0016] The resistance values of the resistors R1, R2, R3 and R4 are adjustable. By adjusting the resistance values, the duty cycle of the output PWM wave can be achieved. At the same time, the values of the capacitors C1 and C2 can also be adjusted, and the duty cycle of the output PWM can also be changed.

[0017] One ends of the resistors R1, R2, R3, R4 and R5 are connected to the +5V power supply.

[0018] The above shows and describes the basic principle, main features and advantages of the present utility model. Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed.

Claims

1. A low-cost square wave generator circuit, characterized in that: It includes an oscillation circuit and a square-wave output circuit. The oscillation circuit includes resistor R1, resistor R2, resistor R3, resistor R4, capacitor C1, capacitor C2, triode Q1 and triode Q2. The base of triode Q1 is connected to one end of capacitor C2 and one end of resistor R3. The other end of capacitor C2 is connected to the collector of triode Q2 and one end of resistor R1. The base of triode Q2 is simultaneously connected to one end of capacitor C1 and one end of resistor R4. The other end of capacitor C1 is connected to the collector of triode Q1 and one end of resistor R2. The square-wave output circuit includes triode Q3, resistor R5 and resistor R6. One end of resistor R6 is connected to the collector of Q1 and the other end is connected to the base of triode Q3. Resistor R5 is connected to the base of Q3.

2. The low-cost square wave generator circuit according to claim 1, characterized in that, A filtering capacitor C3 is connected to the collector of triode Q3.

3. The low-cost square wave generator circuit according to claim 1, characterized in that: The resistance values of resistor R1, resistor R2, resistor R3 and resistor R4 are adjustable.

4. The low-cost square wave generator circuit according to claim 1, wherein: One ends of resistor R1, resistor R2, resistor R3, resistor R4 and resistor R5 are connected to the +5V power supply.

Images