A rectification and voltage stabilization circuit based on 555 timer and reference voltage chip

Abstract

The utility model discloses a rectification voltage stabilizing circuit based on 555 timer and reference voltage chip relates to power supply circuit technical field, the circuit in the utility model, provide stable reference voltage through reference voltage chip, according to the duty cycle of the output pulse of comparison result adjustment, can realize the high precision voltage stabilizing output, satisfy the power supply demand of high precision electronic equipment, utilize common 555 timer and reference voltage chip, compared with the dedicated voltage stabilizing chip, the cost is reduced obviously, has higher cost performance, is suitable for large -scale production and application, through the output signal in control 555 timer module, can conveniently adjust output voltage, to adapt to the demand of different load and application scene to voltage, the PWM circuit of 555 timer composition can realize higher power conversion efficiency, reduce power loss, improve the overall performance of circuit.

Description

Technical Field

[0001] This utility model relates to the field of power supply circuit technology, specifically a rectifier and voltage regulator circuit based on a 555 timer and a reference voltage chip. Background Technology

[0002] In electronic devices, a stable power supply is crucial for ensuring normal operation. Traditional rectifier and voltage regulator circuits often employ linear regulators or simple switching regulators. While linear regulators offer stable output voltage and low ripple, they are inefficient and suffer from significant power losses. Simple switching regulators, although more efficient, have limited voltage regulation accuracy, and their output voltage is prone to fluctuations when the input voltage or load changes, making them unsuitable for the demands of high-precision electronic equipment.

[0003] Currently, some circuits on the market use dedicated voltage regulator chips, but these chips are often expensive, increasing the cost of the circuit. Therefore, there is an urgent need to design a rectifier and voltage regulator circuit that is low-cost, has high voltage regulation accuracy, and is relatively efficient to meet the needs of different application scenarios. Utility Model Content

[0004] The purpose of this invention is to provide a rectifier and voltage regulator circuit based on a 555 timer and a reference voltage chip to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A rectifier and voltage regulator circuit based on a 555 timer and a reference voltage chip includes a rectifier module, a filter module, a 555 timer module, and a reference voltage chip module.

[0007] The input terminal of the rectifier module is connected to an AC power supply, and the output terminal of the rectifier module is connected to the input terminal of the filter module.

[0008] The output of the filtering module is connected to the input of the 555 timer module and the reference voltage chip module, respectively.

[0009] The output of the reference voltage chip module is connected to the control terminal of the 555 timer module.

[0010] Furthermore, the rectifier module includes diodes D103, D101, D105, and D107, which together form a bridge rectifier circuit.

[0011] The connection between diodes D103 and D107 is grounded. The connection between diodes D107 and D105 is connected to AC interface AC1. The connection between diodes D103 and D101 is connected to AC interface AC2. A bidirectional TVS diode D2 and a ceramic capacitor C13 are connected between AC interface AC1 and AC interface AC2. The bidirectional TVS diode D2 and the ceramic capacitor C13 are connected in parallel.

[0012] Furthermore, the filtering module includes electrolytic capacitor C102, electrolytic capacitor C112, ceramic capacitor C103, ceramic capacitor C101, ceramic capacitor C107, and ceramic capacitor C105. Ceramic capacitor C103 is connected in parallel to the outside of diode D103, ceramic capacitor C101 is connected in parallel to the outside of diode D101, ceramic capacitor C107 is connected in parallel to the outside of diode D107, and ceramic capacitor C105 is connected in parallel to the outside of diode D105. The connection between diode D101 and diode D105 is externally connected to the V+ terminal, and the V+ terminal is connected to electrolytic capacitor C112. Electrolytic capacitor C112 is grounded, and electrolytic capacitor C102 is connected in parallel to the outside of electrolytic capacitor C112.

[0013] Furthermore, the 555 timer module includes a 555 timer chip U5. The RESET interface of the 555 timer chip U5 is externally connected to the VCC_10V terminal through resistor R103, and the THRES interface of the 555 timer chip U5 is externally connected to the VCC_10V terminal through resistor R201. The TRIG interface of the 555 timer chip U5 is electrically connected between the THRES interface of the 555 timer chip U5 and resistor R201. The VCC interface of the 555 timer chip U5 is externally connected to the VCC_10V terminal. The GND interface of the 555 timer chip U5 is grounded, and the CONT interface of the 555 timer chip U5 is grounded through ceramic capacitor C203.

[0014] Furthermore, the reference voltage chip module includes a reference voltage chip U202, wherein interface 1 of the reference voltage chip U202 is electrically connected between the THRES interface of the 555 timer chip U5 and the resistor R201; and interface 3 of the reference voltage chip U202 is grounded.

[0015] The reference voltage chip U202's interface 2, resistor R203, resistor R204, and V+ terminal are connected in series.

[0016] An external resistor R202 is connected between the reference voltage chip U202's interface 2 and the resistor R203. The resistor R202 is connected to the connector J16, and the connection between the resistor R202 and the connector J16 is grounded.

[0017] An external diode D4 is connected between the resistor R204 and the V+ terminal. The diode D4 is connected to the connector J13. A resistor R4 is connected in parallel to the outside of the diode D4.

[0018] A TVS diode D111 is externally connected between resistor R202 and connector J16, and the Schottky diode D111 is electrically connected between diode D4 and connector J13.

[0019] Furthermore, it also includes a power supply circuit for the 555 timer module. The power supply circuit for the 555 timer module includes a resistor R206. One end of the resistor R206 is connected to the V+ terminal, and the other end of the resistor R206 is connected to the VCC_10V terminal. Ceramic capacitors C201 and C202 and TVS diode D8 are externally connected between the resistor R206 and the VCC_10V terminal. The ceramic capacitors C201 and C202 and TVS diode D8 are connected in parallel. All of the ceramic capacitors C201 and C202 and TVS diode D8 are grounded.

[0020] Furthermore, it also includes a voltage regulation control circuit, which includes an N-MOS transistor T101 and an N-MOS transistor T102. The drain of the N-MOS transistor T102 is connected to the AC power interface AC1, the drain of the N-MOS transistor T101 is connected to the AC power interface AC2, and the gate of the N-MOS transistor T101 is connected to the gate of the N-MOS transistor T102.

[0021] The source (S) terminals of N-MOS transistor T101 and N-MOS transistor T102 are grounded respectively.

[0022] The OUT interface of the 555 timer chip U5 is electrically connected between the gate of N-MOS transistor T101 and the gate of N-MOS transistor T102.

[0023] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0024] The circuit in this invention provides a stable reference voltage through a reference voltage chip, monitors and adjusts the output voltage, and achieves high-precision regulated output to meet the power supply requirements of high-precision electronic equipment. Utilizing a common 555 timer and reference voltage chip, the cost is significantly reduced compared to dedicated voltage regulator chips, offering high cost-effectiveness and suitability for mass production and application. By controlling the output signal in the 555 timer module, the output voltage can be easily adjusted to adapt to the voltage requirements of different loads and application scenarios. The PWM circuit constructed with the 555 timer achieves high power conversion efficiency, reduces power loss, and improves the overall performance of the circuit. The rectifier module is used to convert the input AC voltage... The output voltage is DC. The filter module filters the rectified DC voltage to reduce voltage ripple. The 555 timer module uses the 555 timer chip as its core and, through configuration of peripheral circuits, forms a pulse width modulation (PWM) circuit to generate pulse signals with variable duty cycles. Its output is connected to the subsequent power adjustment components. The reference voltage chip module uses a high-precision reference voltage chip to provide a stable reference voltage for the 555 timer module. The output of the reference voltage chip module is connected to the control terminal of the 555 timer module to compare the output voltage with the reference voltage and adjust the duty cycle of the output pulse of the 555 timer module according to the comparison result, thereby achieving stable regulation of the output voltage. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 This is a circuit diagram of the entire utility model;

[0027] Figure 2 This is a circuit diagram of the rectifier module and filter module of this utility model;

[0028] Figure 3 This is a circuit diagram of the 555 timer module of this utility model;

[0029] Figure 4 This is a circuit diagram of the reference voltage chip module of this utility model;

[0030] Figure 5 This is a circuit diagram of the power supply circuit for the 555 timer module of this utility model;

[0031] Figure 6 This is a circuit diagram of the voltage regulation control circuit of this utility model;

[0032] In the diagram: 1. Rectifier module; 2. Filter module; 3. 555 timer module; 4. Reference voltage chip module; 5. Power supply circuit for 555 timer module; 6. Voltage regulation control circuit. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] like Figures 1-6 As shown, this utility model provides a technical solution: a rectifier and voltage regulator circuit based on a 555 timer and a reference voltage chip, including a rectifier module 1, a filter module 2, a 555 timer module 3, and a reference voltage chip module 4. The input terminal of the rectifier module 1 is connected to an AC power supply, and the output terminal of the rectifier module 1 is connected to the input terminal of the filter module 2. The output terminal of the filter module 2 is connected to the input terminals of the 555 timer module 3 and the reference voltage chip module 4, respectively. The output terminal of the reference voltage chip module 4 is connected to the control terminal of the 555 timer module 3.

[0035] In one embodiment, the rectifier module 1 includes diodes D103, D101, D105, and D107, which form a bridge rectifier circuit. The connection between diodes D103 and D107 is grounded, the connection between diodes D107 and D105 is connected to AC interface AC1, and the connection between diodes D103 and D101 is connected to AC interface AC2. A bidirectional TVS diode D2 and a ceramic capacitor C13 are connected between AC interface AC1 and AC interface AC2, and the bidirectional TVS diode D2 and the ceramic capacitor C13 are connected in parallel. The rectifier module 1 uses a bridge rectifier circuit composed of four diodes, which, according to a specific connection method, convert the AC input into a full-wave rectified DC output. The rectifier module 1 also uses a bridge rectifier circuit composed of four SK106C diodes to convert the input AC voltage into DC voltage.

[0036] In one embodiment, the filter module 2 includes an electrolytic capacitor C102, an electrolytic capacitor C112, a ceramic capacitor C103, a ceramic capacitor C101, a ceramic capacitor C107, and a ceramic capacitor C105. The ceramic capacitor C103 is connected in parallel to the outside of diode D103, the ceramic capacitor C101 is connected in parallel to the outside of diode D101, the ceramic capacitor C107 is connected in parallel to the outside of diode D107, and the ceramic capacitor C105 is connected in parallel to the outside of diode D105. The diodes D101 and D105... The connection between the two terminals is externally connected to the V+ terminal, which is connected to the electrolytic capacitor C112. The electrolytic capacitor C112 is grounded, and the electrolytic capacitor C102 is connected in parallel to the outside of the electrolytic capacitor C112. The filter module 2 includes an electrolytic capacitor and several ceramic capacitors. The electrolytic capacitor is used to filter out low-frequency ripple, and the ceramic capacitor is used to filter out high-frequency ripple. Through combined filtering, the smoothness of the output voltage is improved. In the filter module 2, two 4700μF electrolytic capacitors and several 5.6nF ceramic capacitors are used for combined filtering to reduce the ripple of the DC voltage.

[0037] In one embodiment, the 555 timer module 3 includes a 555 timer chip U5. The RESET interface of the 555 timer chip U5 is externally connected to the VCC_10V terminal through resistor R103, and the THRES interface of the 555 timer chip U5 is externally connected to the VCC_10V terminal through resistor R201. The TRIG interface of the 555 timer chip U5 is electrically connected between the THRES interface of the 555 timer chip U5 and resistor R201. The VCC interface of the 555 timer chip U5 is externally connected to the VCC_10V terminal. The GND interface of the 555 timer chip U5 is grounded, and the CONT interface of the 555 timer chip U5 is grounded through a ceramic capacitor C203. The 555 timer module 3 includes a 555 timer chip, resistors, and capacitors. By appropriately setting the values ​​of the resistors and capacitors, the oscillation frequency and duty cycle adjustment range of the 555 timer are determined. The 555 timer module 3 uses an SA555 chip. By connecting appropriate resistors and capacitors, the oscillation frequency of the 555 timer is set to 10kHz, and the duty cycle adjustment range is 10%-90%.

[0038] In one embodiment, the reference voltage chip module 4 includes a reference voltage chip U202. Interface 1 of the reference voltage chip U202 is electrically connected between the THRES interface of the 555 timer chip U5 and resistor R201. Interface 3 of the reference voltage chip U202 is grounded. Interface 2 of the reference voltage chip U202, resistor R203, resistor R204, and the V+ terminal are connected in series. An external resistor R202 is connected between interface 2 of the reference voltage chip U202 and resistor R203. Resistor R202 is connected to connector J16, and the connection between resistor R202 and connector J16 is grounded. An external diode D is connected between resistor R204 and the V+ terminal. 4. The diode D4 is connected to the connector J13, and a resistor R4 is connected in parallel outside the diode D4; a TVS diode D111 is externally connected between the resistor R202 and the connector J16, and the Schottky diode D111 is electrically connected between the diode D4 and the connector J13; the reference voltage chip module 4 adopts a high-precision, low-temperature-drift reference voltage chip, and its output terminal is connected to the 555 timer module through a voltage divider resistor to provide a stable reference voltage for feedback regulation; the reference voltage chip module 4 adopts a TL431 high-precision reference voltage chip, and the DC voltage is compared with the 2.5V reference voltage after being divided by a resistor. If it is higher than 2.5V, a low signal is output to feed back to the 555 timer.

[0039] In one embodiment, a 555 timer module power supply circuit 5 is also included. The 555 timer module power supply circuit 5 includes a resistor R206. One end of the resistor R206 is connected to the V+ terminal, and the other end of the resistor R206 is connected to the VCC_10V terminal. Ceramic capacitors C201 and C202 and TVS diode D8 are externally connected between the resistor R206 and the VCC_10V terminal. The ceramic capacitors C201 and C202 and TVS diode D8 are connected in parallel. All of the ceramic capacitors C201 and C202 and TVS diode D8 are grounded.

[0040] In one embodiment, a voltage regulation control circuit 6 is further included. The voltage regulation control circuit 6 includes an N-MOS transistor T101 and an N-MOS transistor T102. The drain (D) of the N-MOS transistor T102 is connected to the AC power interface AC1, and the drain (D) of the N-MOS transistor T101 is connected to the AC power interface AC2. The gate (G) of the N-MOS transistor T101 and the gate (G) of the N-MOS transistor T102 are connected. The source (S) of the N-MOS transistor T101 and the source (S) of the N-MOS transistor T102 are grounded. The OUT interface of the 555 timer chip U5 is electrically connected between the gates of the N-MOS transistors T101 and T102.

[0041] Specific working principle:

[0042] In the circuit of this invention, rectifier module 1 converts the input AC voltage into DC voltage, and filter module 2 filters the rectified DC voltage to reduce voltage ripple. 555 timer module 3, based on a 555 timer chip, forms a pulse width modulation (PWM) circuit through peripheral circuitry to generate pulse signals with variable duty cycles; its output is connected to subsequent power adjustment components. Reference voltage chip module 4 uses a high-precision reference voltage chip to provide a stable reference voltage for 555 timer module 3. The output of reference voltage chip module 4 is connected to the control terminal of 555 timer module 3 to compare the output voltage with the reference voltage and adjust the duty cycle of the output pulse of 555 timer module 3 according to the comparison result, thereby achieving stable regulation of the output voltage. Filter module 2 includes electrolytic capacitors and several ceramic capacitors; the electrolytic capacitors filter out low-frequency ripple, and the ceramic capacitors filter out high-frequency ripple; through combined filtering, the smoothness of the output voltage is improved.

[0043] The beneficial effects of this invention are as follows: High-precision voltage regulation: By providing a stable reference voltage through a reference voltage chip, the output voltage is monitored and adjusted, achieving high-precision regulated output to meet the power supply requirements of high-precision electronic equipment; Cost advantage: Utilizing a common 555 timer and reference voltage chip, the cost is significantly reduced compared to dedicated voltage regulator chips, resulting in a high cost-performance ratio suitable for mass production and application; High flexibility: By controlling the output signal in the 555 timer module, the output voltage can be easily adjusted to adapt to the voltage requirements of different loads and application scenarios; High efficiency: The PWM circuit composed of the 555 timer can achieve high power conversion efficiency, reduce power loss, and improve the overall performance of the circuit;

[0044] When the input AC voltage increases, the rectified output voltage will also increase accordingly. At this time, after the 555 timer receives the low signal feedback from the reference voltage, it drives the two N-MOS transistors T101 and T102 through PIN3. The input AC voltage will be shorted to ground to discharge and reduce the voltage. The voltage is adjusted by voltage division according to the resistors R202, R203, and R204 to achieve a stable voltage output.

[0045] This rectifier and voltage regulator circuit, which uses a 555 timer and a reference voltage chip to achieve regulated output, can be applied to power supply systems for electronic devices with high voltage stability requirements. It solves the problems of low voltage regulation accuracy, high cost, or insufficient efficiency of existing rectifier and voltage regulator circuits, and can provide a stable output voltage to adapt to different input voltage and load changes.

[0046] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rectifier and voltage regulator circuit based on a 555 timer and a reference voltage chip, comprising a rectifier module (1), a filter module (2), a 555 timer module (3), and a reference voltage chip module (4), characterized in that: The input terminal of the rectifier module (1) is connected to an AC power supply, and the output terminal of the rectifier module (1) is connected to the input terminal of the filter module (2). The output of the filter module (2) is connected to the input of the 555 timer module (3) and the reference voltage chip module (4), respectively. The output terminal of the reference voltage chip module (4) is connected to the control terminal of the 555 timer module (3).

2. The rectifier and voltage regulator circuit based on a 555 timer and a reference voltage chip according to claim 1, characterized in that: The rectifier module (1) includes diodes D103, D101, D105 and D107, which together form a bridge rectifier circuit. The connection between diodes D103 and D107 is grounded. The connection between diodes D107 and D105 is connected to AC interface AC1. The connection between diodes D103 and D101 is connected to AC interface AC2. A bidirectional TVS diode D2 and a ceramic capacitor C13 are connected between AC interface AC1 and AC interface AC2. The bidirectional TVS diode D2 and the ceramic capacitor C13 are connected in parallel.

3. The rectifier and voltage regulator circuit based on a 555 timer and a reference voltage chip according to claim 2, characterized in that: The filtering module (2) includes an electrolytic capacitor C102, an electrolytic capacitor C112, a ceramic capacitor C103, a ceramic capacitor C101, a ceramic capacitor C107, and a ceramic capacitor C105. The ceramic capacitor C103 is connected in parallel to the outside of the diode D103, the ceramic capacitor C101 is connected in parallel to the outside of the diode D101, the ceramic capacitor C107 is connected in parallel to the outside of the diode D107, and the ceramic capacitor C105 is connected in parallel to the outside of the diode D105. The connection between the diodes D101 and D105 is externally connected to the V+ terminal. The V+ terminal is connected to the electrolytic capacitor C112. The electrolytic capacitor C112 is grounded, and the electrolytic capacitor C102 is connected in parallel to the outside of the electrolytic capacitor C112.

4. The rectifier and voltage regulator circuit based on a 555 timer and a reference voltage chip according to claim 3, characterized in that: The 555 timer module (3) includes a 555 timer chip U5. The RESET interface of the 555 timer chip U5 is externally connected to the VCC_10V terminal through resistor R103. The THRES interface of the 555 timer chip U5 is externally connected to the VCC_10V terminal through resistor R201. The TRIG interface of the 555 timer chip U5 is electrically connected between the THRES interface of the 555 timer chip U5 and resistor R201. The VCC interface of the 555 timer chip U5 is externally connected to the VCC_10V terminal. The GND interface of the 555 timer chip U5 is grounded. The CONT interface of the 555 timer chip U5 is grounded through ceramic capacitor C203.

5. A rectifier and voltage regulator circuit based on a 555 timer and a reference voltage chip according to claim 4, characterized in that: The reference voltage chip module (4) includes a reference voltage chip U202. The 1 interface of the reference voltage chip U202 is electrically connected between the THRES interface of the 555 timer chip U5 and the resistor R201; the 3 interface of the reference voltage chip U202 is grounded. The reference voltage chip U202's interface 2, resistor R203, resistor R204, and V+ terminal are connected in series. An external resistor R202 is connected between the reference voltage chip U202's interface 2 and the resistor R203. The resistor R202 is connected to the connector J16, and the connection between the resistor R202 and the connector J16 is grounded. An external diode D4 is connected between the resistor R204 and the V+ terminal. The diode D4 is connected to the connector J13. A resistor R4 is connected in parallel to the outside of the diode D4. A TVS diode D111 is externally connected between resistor R202 and connector J16, and the Schottky diode D111 is electrically connected between diode D4 and connector J13.

6. The rectifier and voltage regulator circuit based on a 555 timer and a reference voltage chip according to claim 4, characterized in that: It also includes a 555 timer module power supply circuit (5), which includes a resistor R206. One end of the resistor R206 is connected to the V+ terminal, and the other end of the resistor R206 is connected to the VCC_10V terminal. Ceramic capacitors C201 and C202 and TVS diode D8 are externally connected between the resistor R206 and the VCC_10V terminal. The ceramic capacitors C201 and C202 and TVS diode D8 are connected in parallel. The ceramic capacitors C201 and C202 and TVS diode D8 are all grounded.

7. A rectifier and voltage regulator circuit based on a 555 timer and a reference voltage chip according to claim 4, characterized in that: It also includes a voltage regulation control circuit (6), which includes an N-MOS transistor T101 and an N-MOS transistor T102. The drain of the N-MOS transistor T102 is connected to the AC power interface AC1, the drain of the N-MOS transistor T101 is connected to the AC power interface AC2, and the gate of the N-MOS transistor T101 is connected to the gate of the N-MOS transistor T102. The source (S) terminals of N-MOS transistor T101 and N-MOS transistor T102 are grounded respectively. The OUT interface of the 555 timer chip U5 is electrically connected between the gate of N-MOS transistor T101 and the gate of N-MOS transistor T102.

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