Wide-range input direct-current power supply
A DC power source with MOSFETs and feedback controllers maintains constant output voltage across wide input voltage ranges, addressing inefficiencies in wind turbine blade pitch systems by adapting to input changes through Buck and Boost-Buck modes.
Patent Information
- Application Number
- CN202422205879.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-09
AI Technical Summary
The DC power supply of existing variable pitch systems can only be output at lower power when the input voltage is close to the output voltage, and cannot output normally when the input voltage is too high, resulting in unstable power supply performance.
The circuit design includes the first and second switching circuits and feedback controllers is adopted, and the output voltage is kept constant through the Buck and Boost-Buck mode adjustment. The circuit structure composed of MOS tubes, inductors, capacitors and resistors is used to achieve voltage stability in combination with the feedback control of the power supply chip.
When the input voltage varies across a wide range, the output voltage is always constant, the circuit structure is simple, the performance is reliable, the cost is low, and it is suitable for mass production.
Smart Images
Figure CN223109914U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power electronics, and particularly relates to a DC power supply with a wide input voltage range. Background Art
[0002] In a high-power wind turbine generator set, the main function of the pitch system (also called the pitching system) is to enable the blades to capture wind energy more efficiently and protect the wind turbine blades when the wind speed is high. The DC power supply for the wind power pitch system needs to keep the output voltage constant when the input voltage varies within a wide range.
[0003] The existing power supplies applied to the wind power pitch system mainly use the Buck circuit topology. When the input voltage is close to the output voltage, it can only output at a low power, and it cannot output normally when the input voltage is too high. Therefore, it is necessary to design a DC power supply with a wide input voltage range. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a DC power supply with a wide input voltage range, which solves the technical problems that the existing pitch system can only output at a low power when the input voltage is close to the output voltage and cannot output normally when the input voltage is too high. When the input voltage varies within a wide range, the output voltage always remains constant, with stable and reliable performance, simple structure and low cost.
[0005] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
[0006] A DC power supply with a wide input voltage range includes a first switch circuit, a first switch feedback controller circuit, a second switch circuit and a second switch feedback controller circuit. The voltage input end is connected to the first switch circuit, the first switch feedback controller circuit is connected to the first switch circuit, the output end of the first switch circuit is connected to the input end of the second switch circuit, the second switch feedback controller circuit is connected to the second switch circuit, and the second switch circuit is connected to the output end of the power supply.
[0007] Further, the first switch circuit includes a MOS tube S1, an inductor L1, a capacitor C1, a diode D1, a resistor R1 and a resistor R2. The first end of the inductor L1 is connected to the input voltage V i , the second end of the inductor L1 is connected to the source of the MOS tube S1, the drain of the MOS tube S1 is grounded, the first end of the diode D1 is connected to the second end of the inductor L1, the second end of the diode D1 is connected to the first end of the capacitor C1, the second end of the capacitor C1 is grounded, the resistor R1 and the resistor R2 are connected in series, and the whole of them after series connection is connected between the second end of the diode D1 and the ground. The voltage dividing node of the resistor R1 and the resistor R2 is connected to the output feedback end of the first switch feedback controller circuit.
[0008] Further, the second switching circuit includes an MOS transistor S2, an MOS transistor S3, an inductor L2, a capacitor C2, a resistor R3, and a resistor R4. The source of the MOS transistor S2 is connected to the first end of the capacitor C1. The drain of the MOS transistor S2 is connected to the source of the MOS transistor S3. The drain of the MOS transistor S3 is grounded. The first end of the inductor L2 is connected to the drain of the MOS transistor S2. The second end of the inductor L2 is connected to the first end of the capacitor C2. The first end of the capacitor C2 is connected to the voltage output terminal V out , the second end of the capacitor C2 is grounded. The resistor R3 and the resistor R4 are connected in series, and the whole of them after series connection is connected between the second end of the inductor L2 and the ground. The voltage dividing node of the resistor R3 and the resistor R4 is connected to the output feedback terminal of the second switching feedback controller circuit.
[0009] Further, the first switching feedback controller circuit is a power supply chip U1. The power supply chip U1 is provided with an input voltage sampling terminal, a PWM output terminal, and an output feedback terminal. The input voltage sampling terminal of the power supply chip U1 is connected to the input voltage, and the PWM output terminal is connected to the gate of the MOS transistor S1.
[0010] Further, the second switching feedback controller circuit is a power supply chip U2. The power supply chip U2 is provided with a first PWM output terminal, a second PWM output terminal, and an output feedback terminal. The first PWM output terminal of the power supply chip U2 is connected to the gate of the MOS transistor S2, and the second PWM output terminal is connected to the gate of the MOS transistor S3.
[0011] Further, the MOS transistors S1, S2, and S3 are all N-channel MOS transistors.
[0012] Due to the adoption of the above technical solution, the present utility model has the following beneficial effects:
[0013] The output voltage of the present utility model remains constant all the time when the input voltage changes. According to the change of the input voltage, the circuit has two working modes: Buck mode and Boost-Buck mode. The power supply structure and the control method are simple, and the performance is reliable, and it can be put into mass production at a relatively low price. Description of the Drawings
[0014] Figure 1 is the block diagram of the power supply module of the present utility model;
[0015] Figure 2 is the principle of the power supply circuit of the present utility model. Detailed Embodiments
[0016] To make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the following provides preferred embodiments with reference to the accompanying drawings and further elaborates on the present utility model in detail. However, it should be noted that many details listed in the specification are only for enabling the reader to have a thorough understanding of one or more aspects of the present utility model, and these aspects of the present utility model can be implemented even without these specific details.
[0017] As Figure 1-2 shown, a wide-range input DC power supply includes MOS transistor S1, MOS transistor S2, MOS transistor S3, inductor L1, inductor L2, capacitor C1, capacitor C2, diode D1, power supply chip U1, power supply chip U2, resistor R1, resistor R2, resistor R3, and resistor R4. In this embodiment, N-channel MOS transistors are preferentially used for all MOS transistors; Schottky diodes are preferentially used for all diodes. Both power supply chip U1 and power supply chip U2 are existing power supply chips.
[0018] In the embodiment of the present utility model, power supply chip U1 has an input voltage sampling terminal, a PWM output terminal, and an output feedback terminal; the above-mentioned power supply chip U2 has a first PWM output terminal, a second PWM output terminal, and an output feedback terminal.
[0019] In the embodiment of the present utility model, the input voltage sampling terminal of power supply chip U1 is connected to the input voltage, and the PWM output terminal is connected to the gate of MOS transistor S1; the first PWM output terminal of power supply chip U2 is connected to the gate of MOS transistor S2, and the second PWM output terminal is connected to the gate of MOS transistor S3.
[0020] The first end of inductor L1 is connected to the input voltage V i , the second end of inductor L1 is connected to the source of MOS transistor S1, and the drain of MOS transistor S1 is grounded; the first end of diode D1 is connected to the second end of inductor L1, the second end of diode D1 is connected to the first end of capacitor C1, and the second end of capacitor C1 is grounded; the source of MOS transistor S2 is connected to the first end of capacitor C1, the drain of MOS transistor S2 is connected to the source of MOS transistor S3, and the drain of MOS transistor S3 is grounded; the first end of inductor L2 is connected to the drain of MOS transistor S2, the second end of inductor L2 is connected to the first end of capacitor C2, the first end of capacitor C2 is connected to the voltage output terminal V out , and the second end of capacitor C2 is grounded.
[0021] Resistor R1 and resistor R2 are connected in series, and the whole of them after series connection is connected between the second end of diode D1 and the ground, and the voltage dividing node of resistor R1 and resistor R2 is connected to the output feedback terminal of the power supply chip U1; resistor R3 and resistor R4 are connected in series, and the whole of them after series connection is connected between the second end of inductor L2 and the ground, and the voltage dividing node of resistor R3 and resistor R4 is connected to the output feedback terminal of the power supply chip U2.
[0022] In the embodiment of the present utility model, the operating mode of a wide-range input DC power supply is affected by the change of the input voltage and can be divided into the following two modes: (1) When the input voltage Vin is higher than twice the output voltage Vout, the circuit operates in the Buck mode. At this time, the MOS transistor S1 is in the off state throughout a period T. The duty cycle (D = Ton / T) of the MOS transistors S2 and S3 changes according to the input voltage to maintain the output voltage of the DC power supply unchanged. (2) When the input voltage is less than or equal to twice the output voltage Vout, the circuit operates in the Boost-Buck mode. At this time, the duty cycle of the MOS transistor S1 changes according to the input voltage, and the duty cycles of the MOS transistors S2 and S3 change according to the voltage across the capacitor C1.
[0023] In the working mode (1), within a period T, the MOS transistors S2 and S3 conduct alternately (controlled by the first PWM output terminal HV and the second PWM output terminal LV of the power supply chip U2): When the MOS transistor S2 conducts and the MOS transistor S3 is off, the input voltage charges the inductors L1 and L2. During this period, the inductors L2 and L1 store energy, and the capacitor C1 releases energy; When the MOS transistor S2 is off and the MOS transistor S3 conducts, at this time, the inductor L2 charges the C2 through the conducting channel of the MOS transistor S3, and at the same time, L1 charges the capacitor C1 through the diode D1. The resistors R3 and R4 determine the output voltage Vout. The power supply chip U2 determines the conduction duty cycles of the MOS transistors Q2 and Q2 according to the sampled and feedback voltage, so as to keep the output voltage stable.
[0024] In the working mode (2), the MOS transistor S1 conducts and turns off alternately within a period T: When the MOS transistor S1 is on, the input voltage charges the inductor L1; When the MOS transistor S1 is off, the inductor L1 charges the capacitor C1 through the diode D1. The power supply chip U1 determines the conduction duty cycle of the MOS transistor Q1 according to the sampled and feedback voltage, so as to keep the voltage on the capacitor C1 stable. The working states of the MOS transistors S2 and S3 are the same as those in the working mode (1). The power supply chip U2 determines the conduction duty cycles of the MOS transistors Q2 and Q2 according to the sampled and feedback, so as to keep the output voltage stable.
[0025] The above is only the preferred embodiment of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.
Claims
1. A wide-range input DC power supply, characterized in that: It includes a first switching circuit, a first switching feedback controller circuit, a second switching circuit and a second switching feedback controller circuit. The voltage input terminal is connected to the first switching circuit, the first switching feedback controller circuit is connected to the first switching circuit, the output terminal of the first switching circuit is connected to the input terminal of the second switching circuit, the second switching feedback controller circuit is connected to the second switching circuit, and the second switching circuit is connected to the output terminal of the power supply.
2. The wide-range input DC power supply according to claim 1, wherein: The first switching circuit includes an MOS transistor S1, an inductor L1, a capacitor C1, a diode D1, a resistor R1, and a resistor R2. The first end of the inductor L1 is connected to the input voltage V i , the second end of the inductor L1 is connected to the source of the MOS transistor S1, the drain of the MOS transistor S1 is grounded, the first end of the diode D1 is connected to the second end of the inductor L1, the second end of the diode D1 is connected to the first end of the capacitor C1, the second end of the capacitor C1 is grounded, the resistor R1 and the resistor R2 are connected in series, and the whole of them after series connection is connected between the second end of the diode D1 and the ground. The voltage dividing node of the resistor R1 and the resistor R2 is connected to the output feedback terminal of the first switching feedback controller circuit.
3. The wide-range input DC power supply according to claim 2, wherein: The second switching circuit includes an MOS transistor S2, an MOS transistor S3, an inductor L2, a capacitor C2, a resistor R3, and a resistor R4. The source of the MOS transistor S2 is connected to the first end of the capacitor C1. The drain of the MOS transistor S2 is connected to the source of the MOS transistor S3. The drain of the MOS transistor S3 is grounded. The first end of the inductor L2 is connected to the drain of the MOS transistor S2. The second end of the inductor L2 is connected to the first end of the capacitor C2. The first end of the capacitor C2 is connected to the voltage output terminal V out . The second end of the capacitor C2 is grounded. The resistor R3 and the resistor R4 are connected in series, and the whole of them after series connection is connected between the second end of the inductor L2 and the ground. The voltage division node of the resistor R3 and the resistor R4 is connected to the output feedback terminal of the second switching feedback controller circuit.
4. A wide-range input DC power supply according to claim 1, characterized in that: The first switching feedback controller circuit is a power supply chip U1. The power supply chip U1 is provided with an input voltage sampling terminal, a PWM output terminal and an output feedback terminal. The input voltage sampling terminal of the power supply chip U1 is connected to the input voltage, and the PWM output terminal is connected to the gate of the MOS transistor S1.
5. A wide-range input DC power supply according to claim 1, characterized in that: The second switching feedback controller circuit is a power supply chip U2. The power supply chip U2 is provided with a first PWM output terminal, a second PWM output terminal and an output feedback terminal. The first PWM output terminal of the power supply chip U2 is connected to the gate of the MOS transistor S2, and the second PWM output terminal is connected to the gate of the MOS transistor S3.
6. The wide-range input DC power supply according to claim 3, wherein: The MOS transistors S1, S2 and S3 are all N-channel MOS transistors.