Direct-current stabilized power supply for active power factor correction

Abstract

The utility model relates to the technical field of direct-current voltage-stabilized power supplies, and discloses a direct-current voltage-stabilized power supply for active power factor correction, which comprises a direct-current voltage-stabilized circuit, and is characterized by further comprising a rectifying circuit, a power factor correction circuit and a voltage-stabilized circuit, the input of the direct-current voltage-stabilized circuit is alternating current, and the output of the direct-current voltage-stabilized circuit is a stable direct-current power supply. The direct-current voltage stabilizing circuit is composed of a rectifying circuit, a power factor correction circuit and a voltage stabilizing circuit, the rectifying circuit comprises four diodes and converts alternating current into direct current, the power factor correction circuit comprises a chopper circuit, a filter capacitor and a PWM switching power supply, the voltage stabilizing circuit comprises a voltage stabilizing tube and a resistor, and the resistor is connected with the chopper circuit. The voltage stabilizing diode is a diode which is made by utilizing a PN node reverse breakdown state and plays a voltage stabilizing role, the size is reduced and the cost is reduced by arranging the single bridge rectifier circuit, and the cost and the technical difficulty are reduced by arranging the chopper circuit with few components and small volume.

Description

Technical Field

[0001] The utility model relates to the technical field of direct current (DC) voltage-stabilized power supplies, and more particularly to a DC voltage-stabilized power supply with active power factor correction. Background Art

[0002] An active power factor corrected DC power supply is an advanced electronic device that, while providing DC power, corrects the input current waveform to make it near a sine wave and in phase with the input voltage, thereby improving the power factor and reducing grid pollution. It provides stable DC power to loads. It uses active circuitry to improve the input power factor, ensuring that the input current waveform follows the input voltage waveform. Compared to passive power factor correction, it offers a better power factor improvement, but at a higher cost and potentially lower reliability. This type of power supply is primarily used to provide stable DC power to various electronic devices, such as computers and communications equipment, ensuring proper operation. It also provides precise, stable power supply in scientific research and experiments, ensuring the accuracy and stability of experimental results. It is widely used in a variety of fields, including industrial automation and automotive electronics systems. Whether in home electronics, industrial automation systems, communications systems, or scientific laboratories, DC power supplies play a vital role, not only ensuring the proper operation of various electronic devices but also improving system stability, reliability, and performance.

[0003] Insufficient existing technology: Active power factor corrected DC regulated power supply is an advanced power supply device with many advantages. However, this power supply also has some disadvantages. The first is the high cost. Due to the complex circuit and control technology and high-quality electronic components used in it, the overall cost is relatively high. Secondly, although it has high reliability, its internal structure is complex and maintenance is relatively difficult, which may require professional technicians to perform maintenance. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a DC regulated power supply with active power factor correction to solve the problems existing in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a DC regulated power supply with active power factor correction, comprising a DC voltage stabilizing circuit, and also comprising: a rectifier circuit, a power factor correction circuit, and a voltage stabilizing circuit. The input of the DC voltage stabilizing circuit is AC power, and the output is a stable DC power supply. The DC voltage stabilizing circuit is composed of a rectifier circuit, a power factor correction circuit, and a voltage stabilizing circuit. The rectifier circuit includes four diodes. The rectifier circuit converts AC power into DC power. The power factor correction circuit includes a chopper circuit, a filter capacitor, and a PWM switching power supply. The voltage stabilizing circuit includes a voltage stabilizing diode and a resistor. The voltage stabilizing diode, also known as a Zener diode, is a diode made by utilizing the reverse breakdown state of a PN junction to stabilize voltage and usually operates in a reverse breakdown state.

[0006] Furthermore, the rectifier circuit is also called a rectifier bridge stack, which is a circuit that converts alternating current into direct current. The four diodes are connected in the form of a "bridge". During the positive half-cycle and negative half-cycle of the alternating current, two diodes are turned on, so that the current flowing through the load resistor has the same direction, thereby obtaining a DC signal with the same polarity at the output end.

[0007] Furthermore, the chopper circuit is responsible for converting the input current into a high-frequency square wave signal, adjusting it to the required voltage level through a transformer, removing the high-frequency component through a filter capacitor, and the PWM switching power supply regulates the output voltage.

[0008] Furthermore, the filter capacitor is an energy storage device used to reduce the AC ripple coefficient and improve the efficient and smooth DC output, and an electrolytic capacitor is used.

[0009] Furthermore, the PWM switching power supply chops the input DC voltage into pulse voltages with an amplitude equal to the input voltage amplitude through chopping, and the duty cycle of these pulses is adjusted by the controller of the PWM switching power supply, thereby achieving regulation of the output voltage.

[0010] Furthermore, when the reverse voltage of the Zener diode is lower than the reverse breakdown voltage, its reverse resistance is large and the reverse leakage current is extremely small. When the reverse voltage approaches the critical value of the reverse voltage, the reverse current suddenly increases, which is called breakdown. Although the current varies within a large range, the voltage across the Zener diode is basically stable near the breakdown voltage, thereby realizing the voltage stabilization function of the Zener diode.

[0011] Technical effects and advantages of this utility model:

[0012] 1. The utility model is provided with a single-body bridge rectifier circuit. The rectifier consists of four diodes. During the positive half-cycle and negative half-cycle of the AC power, two diodes are turned on, so that the current flowing through the load resistor has the same direction, thereby obtaining a DC signal with the same polarity at the output end. The main advantage of the bridge rectifier circuit is that it does not require a special center-tapped transformer, thereby reducing the size and cost.

[0013] 2. The utility model has a chopper circuit, which has high output power, few components and small size, and is conducive to reducing costs and technical difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the rectifier circuit structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the power factor correction circuit structure of the utility model;

[0017] Figure 4 This is a schematic diagram of the voltage stabilizing circuit structure of the utility model.

[0018] The figures are marked as follows: 1. DC voltage stabilizing circuit; 2. Rectifier circuit; 201. Diode; 3. Power factor correction circuit; 301. Chopper circuit; 302. Filter capacitor; 303. PWM switching power supply; 4. Voltage stabilizing circuit; 401. Voltage stabilizing diode; 402. Resistor. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely examples. The active power factor corrected DC regulated power supply involved in the present invention is not limited to the various structures recorded in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] Reference Figures 1 to 4The utility model provides a DC regulated power supply with active power factor correction, including a DC regulated circuit 1, and also including: a rectifier circuit 2, a power factor correction circuit 3, and a voltage stabilizing circuit 4. The input of the DC regulated circuit 1 is AC power, and the output is a stable DC power supply. The DC regulated circuit 1 is composed of a rectifier circuit 2, a power factor correction circuit 3, and a voltage stabilizing circuit 4. The rectifier circuit 2 includes four diodes 201. The rectifier circuit 2 converts AC power into DC power. The power factor correction circuit 3 includes a chopper circuit 301, a filter capacitor 302 and a PWM switching power supply 303. The voltage stabilizing circuit 4 includes a voltage stabilizing diode 401 and a resistor 402. The voltage stabilizing diode 401 is also called a Zener diode. It is a diode made by utilizing the reverse breakdown state of a PN junction to stabilize voltage and usually operates in the reverse breakdown state.

[0021] Among them, the rectifier circuit 2 is also called a rectifier bridge stack, which is a circuit that converts alternating current into direct current. It is composed of four diodes 201, which are connected in the form of a "bridge". During the positive half-cycle and negative half-cycle of the alternating current, two diodes 201 are turned on, so that the current flowing through the load resistor has the same direction, thereby obtaining a DC signal with the same polarity at the output end. The main advantage of the bridge rectifier circuit is that it does not require a special center-tapped transformer, thereby reducing size and cost. In addition, it has high average voltage and current utilization on the load, so that the output voltage is approximately equal to 0.9 times the input voltage. It is an efficient and commonly used rectifier circuit.

[0022] The chopper circuit 301 converts the input current into a high-frequency square wave signal, adjusts it to the required voltage level through the transformer, removes the high-frequency component through the filter capacitor 302, and the PWM switching power supply 303 regulates the output voltage.

[0023] Among them, the filter capacitor 302 is an energy storage device used to reduce the AC ripple coefficient and improve the efficient and smooth DC output. It uses an electrolytic capacitor with the characteristics of low temperature rise, low loss and convenience. It is used in the circuit to filter out the AC component and make the output DC smoother.

[0024] Among them, the PWM switching power supply 303 chops the input DC voltage into a pulse voltage with an amplitude equal to the input voltage amplitude through chopping. The duty cycle of these pulses is adjusted by the controller of the PWM switching power supply 303, thereby adjusting the output voltage size. It can achieve precise output control. By adjusting the pulse width, higher resolution can be obtained, energy loss can be reduced, and power supply efficiency can be improved.

[0025] Among them, when the reverse voltage of the Zener diode 401 is lower than the reverse breakdown voltage, its reverse resistance is very large and the reverse leakage current is extremely small. When the reverse voltage approaches the critical value of the reverse voltage, the reverse current suddenly increases, which is called breakdown. Although the current varies within a large range, the voltage across the Zener diode 401 is basically stable near the breakdown voltage, thereby realizing the voltage stabilization function of the Zener diode 401.

[0026] The working principle of the present invention is as follows: the DC voltage stabilizing circuit 1 inputs AC power and outputs a stable DC power supply. The function of the rectifier circuit 2 is to convert AC power into DC power. The rectifier circuit 2 is composed of four diodes 201, which are connected in the form of a "bridge". During the positive half-cycle and negative half-cycle of the AC power, two diodes 201 are turned on, so that the current flowing through the load resistor has the same direction, thereby obtaining a DC signal with the same polarity at the output end. The power factor correction circuit 3 includes a chopper circuit 301, a filter capacitor 302 and a PWM switching power supply 303, wherein the chopper circuit 301 is responsible for converting the input current into a high-frequency square wave signal, the filter capacitor 302 is used in the circuit to filter out the AC component and make the output DC smoother, and the PWM switching power supply 303 chops the input DC voltage into a pulse voltage with an amplitude equal to the input voltage amplitude through chopping, and adjusts the output voltage. It can achieve precise output control, and by adjusting the pulse width, a higher resolution can be obtained, energy loss can be reduced, and power supply efficiency can be improved. The voltage regulator tube 401 stabilizes the voltage output by the power factor correction circuit 3.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A DC regulated power supply with active power factor correction, comprising a DC regulated circuit (1), characterized in that: Also includes: A rectifier circuit (2), a power factor correction circuit (3), and a voltage stabilizing circuit (4); the input of the DC voltage stabilizing circuit (1) is AC power, and the output is a stable DC power supply; the DC voltage stabilizing circuit (1) is composed of a rectifier circuit (2), a power factor correction circuit (3), and a voltage stabilizing circuit (4); the rectifier circuit (2) includes four diodes (201); the rectifier circuit (2) converts AC power into DC power; the power factor correction circuit (3) includes a chopper circuit (301), a filter capacitor (302), and a PWM switching power supply (303); the voltage stabilizing circuit (4) includes a voltage stabilizing diode (401) and a resistor (402); the voltage stabilizing diode (401), also known as a Zener diode, is a diode made by utilizing the reverse breakdown state of a PN junction to perform a voltage stabilizing function, and usually operates in the reverse breakdown state.

2. The active power factor corrected DC regulated power supply according to claim 1, characterized in that: The rectifier circuit (2), also known as a rectifier bridge stack, is a circuit for converting alternating current into direct current. The four diodes (201) are connected in the form of a "bridge". During the positive half cycle and the negative half cycle of the alternating current, two diodes (201) are turned on, so that the currents flowing through the load resistor have the same direction, thereby obtaining a direct current signal with the same polarity at the output end.

3. The active power factor corrected DC regulated power supply according to claim 1, characterized in that: The chopper circuit (301) is responsible for converting the input current into a high-frequency square wave signal, adjusting it to a required voltage level through a transformer, removing the high-frequency component through a filter capacitor (302), and the PWM switching power supply (303) regulates the output voltage.

4. The active power factor corrected DC regulated power supply according to claim 3, characterized in that: The filter capacitor (302) is an energy storage device used to reduce the AC ripple coefficient and improve the efficient and smooth DC output, and is an electrolytic capacitor.

5. The active power factor corrected DC regulated power supply according to claim 3, characterized in that: The PWM switching power supply (303) chops the input DC voltage into pulse voltages with an amplitude equal to the input voltage amplitude through chopping, and the duty cycle of these pulses is adjusted by a controller of the PWM switching power supply (303), thereby achieving adjustment of the output voltage.

6. The active power factor corrected DC regulated power supply according to claim 1, characterized in that: When the reverse voltage of the voltage regulator tube (401) is lower than the reverse breakdown voltage, its reverse resistance is large and the reverse leakage current is extremely small. When the reverse voltage approaches the critical value of the reverse voltage, the reverse current suddenly increases, which is called breakdown. Although the current varies within a large range, the voltage across the voltage regulator tube (401) is basically stable near the breakdown voltage, thereby realizing the voltage stabilization function of the voltage regulator tube (401).

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