Practical wide voltage output circuit
By controlling the on and off states of the MOSFETs, the half-bridge circuit is converted into a full-bridge circuit, solving the problem of narrow voltage output range in existing technologies and achieving a wider voltage output range. This approach is cost-effective and the circuit is reliable.
Patent Information
- Application Number
- CN202423017486.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-06
AI Technical Summary
Existing single half-bridge or full-bridge output power supplies have a narrow voltage output range, which cannot meet the output requirements of a wider range.
By controlling the on and off states of the MOSFETs in the LLC section, the half-bridge circuit can be converted into a full-bridge circuit. With proper parameter design and the addition of two MOSFETs, the gain of the half-bridge or full-bridge circuit can be doubled, thus widening the voltage output range.
It achieves a wider range of voltage output requirements, has lower cost, reliable circuit topology, enhances practicality, and solves the problem of narrow output power range of single half-bridge or full-bridge circuits.
Smart Images
Figure CN223553230U_ABST
Abstract
Description
[Technical Field]
[0001] This utility model relates to the field of circuits, and in particular to a practical wide voltage output circuit. [Background Technology]
[0002] Existing single-half-bridge or full-bridge output power supplies typically suffer from a narrow output range, failing to meet broader output requirements. [Utility Model Content]
[0003] To overcome the above problems, this utility model proposes a practical wide voltage output circuit that can effectively solve the above problems.
[0004] The present invention provides a technical solution to the above-mentioned technical problems by providing a practical wide-voltage output circuit, including MOSFETs Q1, Q2, Q3, and Q4, a resonant inductor Lr, a resonant capacitor Cr, a transformer T, output diodes D1 and D2, and an output capacitor C. The positive terminal of the supply voltage Vin is connected to MOSFETs Q1 and Q2, and the negative terminal of the supply voltage Vin is connected to MOSFETs Q3 and Q4. MOSFETs Q1 and Q3 are connected together to the resonant inductor Lr, and MOSFETs Q2 and Q4 are connected together to the transformer T. The resonant inductor Lr is connected to the resonant capacitor Cr, the resonant capacitor Cr is connected to the transformer T, the transformer T is connected to the output diode D1, and the output diode D1 is connected to the output capacitor C. The transformer T is connected to the output capacitor C, the transformer T is connected to the output diode D2, and the output diode D2 is connected to the output diode D1.
[0005] Preferably, the positive terminal of the power supply voltage Vin is connected to the drain (D) terminal of MOSFETs Q1 and Q2, and the negative terminal of the power supply voltage Vin is connected to the source (S) terminal of MOSFETs Q3 and Q4.
[0006] Preferably, the source (S) terminal of MOSFET Q1 is connected to the drain (D) terminal of MOSFET Q3, and is also connected to the left end of the resonant inductor Lr. The source (S) terminal of MOSFET Q2 is connected to the drain (D) terminal of MOSFET Q4, and is also connected to the lower end of the left winding of transformer T.
[0007] Preferably, the right side of the resonant inductor Lr is connected to the left end of the resonant capacitor Cr, and the right end of the resonant capacitor Cr is connected to the upper end of the left winding of the transformer T.
[0008] Preferably, the upper end of the right winding of the transformer T is connected to the anode of the output diode D1, and the cathode of the output diode D1 is connected to the output capacitor C.
[0009] Preferably, the center tap of the transformer T is connected to the negative terminal of the output capacitor C, and the lower end of the secondary winding of the transformer T is connected to the anode of the output diode D2.
[0010] Preferably, the negative terminal of the output diode D2 is connected to the cathode of the output diode D1, and the positive and negative terminals of the output capacitor C are connected to the positive and negative terminals of the output Vout, respectively.
[0011] Compared with existing technologies, the practical wide-voltage output circuit of this invention converts a half-bridge circuit into a full-bridge circuit by controlling the on and off of the MOSFETs in the LLC section. Through the rational design of parameters, it can provide twice the gain of a single half-bridge or full-bridge circuit, which can meet a wider range of voltage output requirements. The half-bridge or full-bridge circuit topology is mature and reliable. Compared with the cost of a half-bridge, it only adds two MOSFETs, resulting in lower cost. It solves the problem of narrow output power range of single half-bridge or full-bridge circuits and has strong practicality. [Attached Image Description]
[0012] Figure 1 This is a schematic diagram of the practical wide voltage output circuit of this utility model.
Detailed Implementation Methods
[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this utility model.
[0014] It should be noted that in this embodiment of the invention, all directional indications (such as up, down, left, right, front, back, etc.) are limited to relative positions on the specified view, rather than absolute positions.
[0015] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0016] Please see Figure 1 The practical wide voltage output circuit of this utility model includes MOSFETs Q1, Q2, Q3, and Q4, resonant inductor Lr, resonant capacitor Cr, transformer T, output diodes D1 and D2, and output capacitor C.
[0017] The positive terminal of the supply voltage Vin is connected to MOSFETs Q1 and Q2 respectively, and the negative terminal of the supply voltage Vin is connected to MOSFETs Q3 and Q4 respectively. MOSFETs Q1 and Q3 are connected together to the resonant inductor Lr, and MOSFETs Q2 and Q4 are connected together to the transformer T.
[0018] The resonant inductor Lr is connected to the resonant capacitor Cr, the resonant capacitor Cr is connected to the transformer T, the transformer T is connected to the output diode D1, the output diode D1 is connected to the output capacitor C.
[0019] The transformer T is connected to the output capacitor C, the transformer T is connected to the output diode D2, the output diode D2 is connected to the output diode D1, and the output capacitor C is connected to the output Vout.
[0020] Specifically:
[0021] The positive terminal of the supply voltage Vin is connected to the drain of MOSFETs Q1 and Q2, and the negative terminal of the supply voltage Vin is connected to the source of MOSFETs Q3 and Q4. The source of MOSFET Q1 is connected to the drain of MOSFET Q3, and is also connected to the left end of the resonant inductor Lr. The source of MOSFET Q2 is connected to the drain of MOSFET Q4, and is also connected to the lower end of the left winding of transformer T.
[0022] The right side of the resonant inductor Lr is connected to the left end of the resonant capacitor Cr. The right end of the resonant capacitor Cr is connected to the upper end of the left winding of the transformer T. The upper end of the right winding of the transformer T is connected to the anode of the output diode D1. The cathode of the output diode D1 is connected to the output capacitor C. The center tap of the transformer T is connected to the negative terminal of the output capacitor C. The lower end of the secondary winding of the transformer T is connected to the anode of the output diode D2. The negative terminal of the output diode D2 is connected to the cathode of the output diode D1. The positive and negative terminals of the output capacitor C are connected to the positive and negative terminals of the output Vout, respectively.
[0023] Explanation of the principle:
[0024] This utility model presents a practical wide-voltage output circuit that achieves the conversion between LLC half-bridge and full-bridge circuits by controlling the switching on and off of the MOSFET in the control circuit. (Parameter description: G1 half-bridge LLC gain; n transformer primary and secondary turns ratio; Vout output voltage; Vin input voltage; V1 output voltage; V2 high voltage output)
[0025] When Q2 and Q4 do not participate in resonance (i.e., Q2 is off and Q4 is on), Q1, Q3, Lr, Cr, and the main transformer form a half-bridge. The half-bridge LLC gain is G1, and the power circuit gain is G1 = Vin / (2*n*Vout). When the output requirement is to rise from the lowest voltage V1 to the highest voltage V2, while the input voltage Vin is constant and the transformer turns ratio is fixed at n:1:1, the gain condition must be met: Vout≥V2, i.e., Vin / 2 / n / G1≥V2. If this condition cannot be met, the gain will be insufficient, and the output will not reach the required voltage V2. Therefore, to solve the problem of insufficient gain due to an excessively wide output voltage range, when Vin / 2 / n / G1 < V2, Q2 and Q4 participate in resonance, the resonant cavity parameters remain unchanged, the half-bridge becomes a full-bridge, and the gain transmitted to the output is G2 = Vin / n * Vout. If the input and output voltages remain unchanged, it is easy to see from the formula that the gain of the full-bridge is twice that of the half-bridge. That is, when a lower output voltage V1 is required, the power supply adopts a half-bridge topology, and when a higher output voltage V2 is required, Q2 and Q4 participate in resonance, the power supply topology becomes a full-bridge, the gain becomes G2, and the gain is twice that of the half-bridge, thus greatly widening the output voltage range.
[0026] Compared with existing technologies, the practical wide-voltage output circuit of this invention converts a half-bridge circuit into a full-bridge circuit by controlling the on and off of the MOSFETs in the LLC section. Through the rational design of parameters, it can provide twice the gain of a single half-bridge or full-bridge circuit, which can meet a wider range of voltage output requirements. The half-bridge or full-bridge circuit topology is mature and reliable. Compared with the cost of a half-bridge, it only adds two MOSFETs, resulting in lower cost. It solves the problem of narrow output power range of single half-bridge or full-bridge circuits and has strong practicality.
[0027] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any modifications, equivalent substitutions and improvements made within the concept of the present utility model should be included within the patent protection scope of the present utility model.
Claims
1. A practical wide-voltage output circuit, characterized in that, This includes MOSFETs Q1, Q2, Q3, and Q4; resonant inductor Lr; resonant capacitor Cr; transformer T; output diodes D1 and D2; and output capacitor C. The positive terminal of the supply voltage Vin is connected to MOSFETs Q1 and Q2 respectively, and the negative terminal of the supply voltage Vin is connected to MOSFETs Q3 and Q4 respectively. MOSFETs Q1 and Q3 are connected together to the resonant inductor Lr, and MOSFETs Q2 and Q4 are connected together to the transformer T. The resonant inductor Lr is connected to the resonant capacitor Cr, the resonant capacitor Cr is connected to the transformer T, the transformer T is connected to the output diode D1, the output diode D1 is connected to the output capacitor C. The transformer T is connected to the output capacitor C, the transformer T is connected to the output diode D2, and the output diode D2 is connected to the output diode D1.
2. The practical wide voltage output circuit as described in claim 1, characterized in that, The positive terminal of the power supply voltage Vin is connected to the drain (D) terminal of MOSFETs Q1 and Q2, and the negative terminal of the power supply voltage Vin is connected to the source (S) terminal of MOSFETs Q3 and Q4.
3. The practical wide voltage output circuit as described in claim 1, characterized in that, The source (S) terminal of MOSFET Q1 is connected to the drain (D) terminal of MOSFET Q3, and is also connected to the left end of the resonant inductor Lr. The source (S) terminal of MOSFET Q2 is connected to the drain (D) terminal of MOSFET Q4, and is also connected to the lower end of the left winding of transformer T.
4. The practical wide voltage output circuit as described in claim 1, characterized in that, The right side of the resonant inductor Lr is connected to the left end of the resonant capacitor Cr, and the right end of the resonant capacitor Cr is connected to the upper end of the left winding of the transformer T.
5. The practical wide voltage output circuit as described in claim 1, characterized in that, The upper end of the right winding of the transformer T is connected to the anode of the output diode D1, and the cathode of the output diode D1 is connected to the output capacitor C.
6. The practical wide voltage output circuit as described in claim 1, characterized in that, The center tap of the transformer T is connected to the negative terminal of the output capacitor C, and the lower end of the secondary winding of the transformer T is connected to the anode of the output diode D2.
7. The practical wide voltage output circuit as described in claim 1, characterized in that, The negative terminal of the output diode D2 is connected to the cathode of the output diode D1, and the positive and negative terminals of the output capacitor C are connected to the positive and negative terminals of the output Vout, respectively.