CN105511544A - Adjustable voltage stabilizing circuit - Google Patents

Abstract

The invention provides an adjustable voltage stabilizing circuit, which aims to improve the stability of a working circuit and is characterized in that: the circuit comprises a first transistor, a second transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a sliding rheostat, a sixth resistor and a voltage stabilizing diode; the first resistor, the sliding rheostat and the second resistor are connected in series, and the third resistor and the voltage stabilizing diode are connected in series; the collector of the first transistor is connected with the anode of a power supply, one end of the first resistor, one end of the third resistor and one end of the sixth resistor are respectively connected with the emitter of the first transistor, the second resistor, the sixth resistor and the voltage stabilizing diode are connected with the cathode of the power supply, the base of the second transistor is connected with the sliding end of the sliding rheostat, the emitter of the second transistor is connected between the third resistor and the voltage stabilizing diode, one end of the fourth resistor is connected with the anode of the power supply, and the other end of the fourth resistor, the base of the first transistor and the collector of the second transistor are connected.

Description

Adjustable voltage regulator circuit

technical field

The invention relates to an adjustable voltage stabilizing circuit.

Background technique

In order to ensure the working stability of the integrated circuit, an integrated voltage regulator circuit is generally designed in the integrated circuit to ensure the stability of the output voltage of the integrated circuit power supply, but many voltage regulator circuits are non-adjustable voltage regulator circuits, which cannot Meet the needs of actual work.

Contents of the invention

In order to solve the deficiencies in the prior art, the present invention provides an adjustable voltage stabilizing circuit, which can adjust the output voltage by adjusting the sampling value in the sampling circuit, and at the same time, set a filter in the circuit to improve The working stability of the circuit, its specific technical content is as follows:

An adjustable voltage stabilizing circuit, comprising a first transistor, a second transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a sliding rheostat, a sixth resistor and a Zener diode; the first resistor, the sliding rheostat and the second resistor in series, the third resistor and the Zener diode in series; the collector of the first transistor is connected to the positive pole of the power supply, and one end of the first resistor, the third resistor and the sixth resistor are respectively connected to the emitter of the first transistor, and the second The resistor, the sixth resistor and the Zener diode are connected to the negative pole of the power supply, the base of the second transistor is connected to the sliding end of the sliding rheostat, the emitter of the second transistor is connected between the third resistor and the Zener diode, one end of the fourth resistor and The positive pole of the power supply is connected, and the other end of the fourth resistor is connected with the base of the first transistor and the collector of the second transistor.

In one or more embodiments of the present invention, the Zener diode is connected in parallel with a bypass capacitor.

In one or more embodiments of the present invention, the maximum resistance of the sliding rheostat is 2kΩ.

Compared with the prior art, the present invention is superior in that it adopts a sliding rheostat between the first resistance and the second resistance in the sampling circuit to realize the adjustable voltage stabilizer, and the parallel connection of the voltage stabilizer diode The circuit capacitor can stabilize the base voltage of the second transistor and improve the stability of the working circuit.

Description of drawings

Fig. 1 is the circuit principle diagram of the adjustable voltage stabilizing circuit of the present invention.

detailed description

Below in conjunction with accompanying drawing 1, the application scheme is further described:

As shown in Figure 1, an adjustable voltage stabilizing circuit includes a first transistor T1, a second transistor T2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a sliding rheostat R5, a first Six resistors R6 and Zener diode D1; the first resistor R1, the sliding rheostat R5 and the second resistor R2 are connected in series, the third resistor R3 is connected in series with the Zener diode D1; the collector of the first transistor T1 is connected to the positive pole of the power supply, and the first resistor One end of R1, the third resistor R3 and the sixth resistor R6 are respectively connected to the emitter of the first transistor T1, the second resistor R2, the sixth resistor R6 and the Zener diode D1 are connected to the negative pole of the power supply, and the base of the second transistor T2 is connected to the sliding The sliding end of the rheostat R5, the emitter of the second transistor T2 is connected between the third resistor R3 and the Zener diode D1, one end of the fourth resistor R4 is connected to the positive pole of the power supply, the other end of the fourth resistor R4 is connected to the first transistor T1 The base of the second transistor T2 is connected to the collector.

In order to ensure the voltage stability of the base of the second transistor T2, a bypass capacitor C1 is connected in parallel with the Zener diode D1, and the maximum resistance of the sliding rheostat R5 is 2kΩ.

In the present invention, a sliding rheostat R5 is set between the first resistor R1 and the second resistor R2 in the sampling circuit to realize the adjustable voltage regulator, and the bypass capacitor connected in parallel with the voltage regulator diode D1 can stabilize the second transistor T2. Base voltage, improve the stability of the working circuit.

The above-mentioned preferred implementation mode should be regarded as an illustration of the implementation mode of the scheme of this application, and any technical deduction, replacement, improvement, etc. that are similar to, similar to, or based on the scheme of this application should be regarded as the scope of protection of this patent.

Claims (3)

1. an adjustable mu balanced circuit, is characterized in that: comprise the first transistor, transistor seconds, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, slide rheostat, the 6th resistance and voltage stabilizing diode; First resistance, slide rheostat and the second resistant series, the 3rd resistance and voltage stabilizing diode series connection; The collector of the first transistor connects the positive pole of power supply, first resistance, the 3rd resistance and one end of the 6th resistance are connected the emitter-base bandgap grading of the first transistor respectively, second resistance, the 6th resistance are connected power cathode with voltage stabilizing diode, the base stage of transistor seconds connects the sliding end of slide rheostat, the emitter-base bandgap grading of transistor seconds is connected to the 3rd between resistance and voltage stabilizing diode, one end of 4th resistance is connected with positive source, and the other end, the base stage of the first transistor of the 4th resistance are connected with the collector of transistor seconds.

2. the adjustable mu balanced circuit of one according to claim 1, is characterized in that: described voltage stabilizing diode is parallel with shunt capacitance.

3. the adjustable mu balanced circuit of one according to claim 2, is characterized in that: the maximum value of described slide rheostat is 2k Ω.