Circuit with direct current-to-positive and negative power supply voltage stabilization function

Abstract

A circuit with a direct current-to-positive and negative power supply voltage stabilization function comprises a boost chip U24, the model of the boost chip U24 is XL6008, an input voltage is connected with a fourth pin of the boost chip U24, a first pin of the boost chip U24 is grounded, a second pin of the boost chip U24 is a control pin EN, a fifth pin of the boost chip U24 is a feedback pin FB, and the first pin of the boost chip U24 is grounded. And a third pin of the boost chip U24 is a power switch output pin SW and realizes positive and negative power supply output through two winding branches. The operational amplifier is powered by double power supplies, the dynamic range is large, the sound intensity is higher, circuit elements are few, the development period is greatly shortened, the fault rate is low, and the whole machine noise is low.

Description

Technical Field

[0001] The utility model relates to the technical field of audio, in particular to a circuit with a direct current to positive and negative power supply voltage stabilization function. Background Art

[0002] In the pre-amplifier tone circuit, many operational amplifiers are usually used. If the device is powered by an adapter or battery, the operational amplifier can only be powered by a single power supply and needs to provide a midpoint voltage, which not only adds many components to the circuit, but also reduces the dynamic range of the overall output. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a circuit with a DC-to-positive and negative power supply stabilization function, so as to solve the problem that an operational amplifier cannot be powered by dual power supplies.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a circuit with a DC to positive and negative power supply stabilization function, including a boost chip U24, the model of the boost chip U24 is XL6008, the input voltage is connected to the 4th pin of the boost chip U24, the 1st pin of the boost chip U24 is grounded, the 2nd pin of the boost chip U24 is the control pin EN, the 5th pin of the boost chip U24 is the feedback pin FB, the 3rd pin of the boost chip U24 is the power switch output pin SW and realizes positive and negative power output through two winding branches. Principle of the utility model: input voltage is input through the 4th pin, the 2nd pin of the boost chip U24 is the U24 control pin EN, which works at a high level, is closed at a low level, and is suspended at a high level; the 5th pin of the boost chip U24 is the feedback pin FB, the reference voltage is 1.25V, and the output calculation formula is VOUT=1.25X(1+(R29+R151) / R149)V; the 3rd pin of the boost chip U24 is the power switch output pin SW, which realizes positive and negative power supply output through two windings, solving the bottleneck that the operational amplifier cannot be powered by dual power supplies for battery-powered products or adapter-powered products.

[0005] Compared with the prior art, the utility model has the following beneficial effects:

[0006] The operational amplifier is powered by dual power supplies, has a large dynamic range, stronger sound intensity, fewer circuit components, greatly shortened development cycle, low failure rate, and low overall noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is the circuit diagram of the utility model. DETAILED DESCRIPTION

[0008] The utility model will be further described below in conjunction with the accompanying drawings.

[0009] like Figure 1As shown, a circuit with a DC to positive and negative power supply voltage stabilization function includes a boost chip U24, and the model of the boost chip U24 is XL6008. The input voltage +14.4V is connected to the 4th pin of the boost chip U24, the 1st pin of the boost chip U24 is grounded, the 2nd pin of the boost chip U24 is the control pin EN, the 5th pin of the boost chip U24 is the feedback pin FB, the 3rd pin of the boost chip U24 is the power switch output pin SW and realizes the positive and negative power supply 15V output through two winding branches; the input voltage is grounded through two parallel capacitors C43 and capacitor C42, and the input voltage is connected to the 3rd pin of the boost chip U24 through the coil L6A, One end of the coil L6 coupled to the coil L6A is grounded, and the other end is connected to the capacitor C205 and the capacitor C212 respectively. The third foot of the boost chip U24 is connected to the capacitor C212. The same-name end of the coil L6 is grounded, and the same-name end of the coil L6A is connected to the input voltage. The first winding branch includes a diode D26 and a winding L17. The third foot of the boost chip U24 outputs a positive power supply after passing through the capacitor C212, the diode D26 and the winding L17 in sequence. The second winding branch includes a coil L15, a coil L15A and Winding L16, the third foot of the boost chip U24 outputs a negative power supply after passing through capacitor C212, capacitor C205, coil L15, coil L15A and winding L16 in sequence, the coil L15 is coupled with coil L15A, the same-name end of the coil L15 is connected to capacitor C205 and grounded through diode D7, and the same-name end of the coil L15A is connected to winding L16; the anode of the diode D26 is grounded through parallel capacitor C197 and capacitor C196, and the output end of the winding L17 is connected through parallel capacitor C20 4 and resistor R197 are grounded; the same-name end of the coil L15A is grounded through parallel capacitors C203 and C202, and the output end of the winding L16 is grounded through parallel capacitors C37 and resistor R192; the 5th pin of the boost chip is connected to the anode of the diode D26 through resistors R151 and R29 in turn, and the 5th pin of the boost chip is grounded through resistor R149; the reference voltage is 1.25V, and the output calculation formula is VOUT=1.25X(1+(R29+R151) / R149)V.

[0010] The principle of the utility model is as follows: the input voltage is input through the 4th pin, the 2nd pin of the boost chip U24 is the U24 control pin EN, which works at a high level, is closed at a low level, and is suspended at a high level; the 5th pin of the boost chip U24 is the feedback pin FB, and the 3rd pin of the boost chip U24 is the power switch output pin SW. Positive and negative power outputs are achieved through two windings, solving the bottleneck that battery-powered products or adapter-powered products and operational amplifiers cannot be powered by dual power supplies.

Claims

1. A circuit with DC to positive and negative power supply voltage stabilization function, characterized in that: It includes a boost chip U24, the model of the boost chip U24 is XL6008, the input voltage is connected to the 4th pin of the boost chip U24, the 1st pin of the boost chip U24 is grounded, the 2nd pin of the boost chip U24 is the control pin EN, the 5th pin of the boost chip U24 is the feedback pin FB, the 3rd pin of the boost chip U24 is the power switch output pin SW and realizes positive and negative power output through two winding branches.

2. A circuit for converting DC to positive and negative power supply voltage stabilization according to claim 1, characterized in that: The input voltage is grounded through two parallel capacitors C43 and capacitor C42. The input voltage is connected to the third pin of the boost chip U24 through coil L6A. One end of the coil L6 coupled to the coil L6A is grounded, and the other end is respectively connected to capacitor C205 and capacitor C212. The third pin of the boost chip U24 is connected to capacitor C212.

3. A circuit for converting DC to positive and negative power supply voltage stabilization according to claim 1, characterized in that: The first winding branch includes a diode D26 and a winding L17, and the third foot of the boost chip U24 outputs a positive power supply through a capacitor C212, a diode D26 and a winding L17 in sequence; The second winding branch includes coil L15, coil L15A and winding L16. The third foot of the boost chip U24 outputs a negative power supply through capacitor C212, capacitor C205, coil L15, coil L15A and winding L16 in sequence; the coil L15 is coupled with coil L15A, the same-name end of the coil L15 is connected to capacitor C205 and grounded through diode D7, and the same-name end of the coil L15A is connected to winding L16; the anode of the diode D26 is grounded through parallel capacitor C197 and capacitor C196, and the output end of the winding L17 is grounded through parallel capacitor C204 and resistor R197; the same-name end of the coil L15A is grounded through parallel capacitor C203 and capacitor C202, and the output end of the winding L16 is grounded through parallel capacitor C37 and resistor R192.

4. A circuit for converting DC to positive and negative power supply voltage stabilization according to claim 3, characterized in that: The fifth pin of the boost chip is connected to the anode of the diode D26 through the resistor R151 and the resistor R29 in sequence, and the fifth pin of the boost chip is grounded through the resistor R149.

Images