Three-in-one output rectification control circuit

Abstract

The utility model discloses a three-in-one output rectification control circuit which is applied to a PCB (Printed Circuit Board), and the PCB is provided with first to eighth connecting positions; in the first rectification output mode, the first connection position and the sixth connection position are suspended, and the second connection position, the third connection position, the fourth connection position, the fifth connection position, the seventh connection position and the eighth connection position are respectively provided with an MOS tube Q3, a resistor R4, a resistor R5, an MOS tube Q4, a capacitor EC3 and a synchronous rectification circuit. In a second rectification output mode, the first, third, fourth, sixth and eighth connection positions are suspended, and the second, fifth and seventh connection positions are respectively provided with a diode D4, a diode D5 and a capacitor EC3; in a third rectification output mode, the third connection position, the fourth connection position and the eighth connection position are suspended, and the first connection position, the second connection position, the fifth connection position, the sixth connection position and the seventh connection position are respectively provided with a diode D2, a diode D4, a diode D5, a diode D3 and a capacitor EC3; through the above structure, three rectification modes of common rectification, synchronous rectification and bridge rectification can be realized on the same PCB, the design types of the PCB are reduced, the inventory cost is greatly reduced, and the cost in product authentication is also reduced.

Description

Technical Field

[0001] The utility model relates to the field of power supply circuits and controller circuits, in particular to a three-in-one output rectification control circuit. Background Art

[0002] With the rapid development of LED lighting industry, LEDs are installed in every household and outdoor lighting, which also makes the LED power supply market flourish. With the market demand, the output voltage range of power supply with the same power is getting wider and wider. For different output voltages, the output rectifier circuits to be designed are also different. Due to the diode withstand voltage and cost issues, the output rectifier design is basically the same frequency for low voltage, ordinary rectification for medium voltage, and bridge rectification for high voltage. Different rectifications correspond to different PCB designs, resulting in multiple PCBs for the same power. Therefore, it is very important to develop a three-in-one output rectifier control circuit. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a three-in-one output rectification control circuit.

[0004] An embodiment of the utility model solves the technical problem by adopting a technical solution: a three-in-one output rectification control circuit is applied to a PCB board, and a first connection position, a second connection position, a third connection position, a fourth connection position, a fifth connection position, a sixth connection position, a seventh connection position and an eighth connection position are provided on the PCB board;

[0005] The first end of the secondary winding of the transformer T1 is connected to the first end of the first connection position and the first end of the second connection position; the second end of the first connection position, the first end of the seventh connection position, and the second end of the sixth connection position are commonly connected to V+; the second end of the second connection position, the second end of the seventh connection position, the second end of the third connection position, the second end of the fourth connection position, and the second end of the fifth connection position are commonly connected to V-; the second end of the secondary winding of the transformer T1 is connected to GNS; the third end of the secondary winding of the transformer T1 is commonly connected to the first end of the fifth connection position and the first end of the sixth connection position; the third end of the second connection position, the first end of the third connection position, the first end of the fourth connection position, and the third end of the fifth connection position are commonly connected to the eighth connection position;

[0006] In the first rectification output mode, the first connection bit and the sixth connection bit are left floating, the second connection bit is set to the MOS tube Q3, the third connection bit is set to the resistor R4, the fourth connection bit is set to the resistor R5, the fifth connection bit is set to the MOS tube Q4, the seventh connection bit is set to the capacitor EC3, and the eighth connection bit is set to the synchronous rectification circuit;

[0007] In the second rectification output mode, the first connection bit, the third connection bit, the fourth connection bit, the sixth connection bit and the eighth connection bit are suspended, the second connection bit is provided with a diode D4, the fifth connection bit is provided with a diode D5 and the seventh connection bit is provided with a capacitor EC3;

[0008] In the third rectification output mode, the third connection bit, the fourth connection bit and the eighth connection bit are suspended, the first connection bit is set with a diode D2, the second connection bit is set with a diode D4, the fifth connection bit is set with a diode D5, the sixth connection bit is set with a diode D3 and the seventh connection bit is set with a capacitor EC3.

[0009] As one of the preferred embodiments of the utility model, the synchronous rectification circuit includes a synchronous rectification chip U2, a resistor R6 and a capacitor C2; the 7th pin of the synchronous rectification chip U2 is connected to the power supply VDD; the 1st pin of the synchronous rectification chip U2 is connected to the first end of the MOS tube Q3; the 8th pin of the synchronous rectification chip U2 is connected to the first end of the MOS tube Q4; the 4th pin of the synchronous rectification chip U2 is connected to the third end of the MOS tube Q4; the 6th pin of the synchronous rectification chip U2 is connected to the third end of the MOS tube Q3; the 2nd pin of the synchronous rectification chip U2 is connected to GNS; the 5th pin of the synchronous rectification chip U2 is respectively connected to the second end of the MOS tube Q3 and the second end of the MOS tube Q4.

[0010] The beneficial effects of the utility model include: a three-in-one output rectifier control circuit, the output rectifier control circuit is applied to a PCB board, and the PCB board is provided with first to eighth connection positions; in a first rectifier output mode, the first connection position and the sixth connection position are suspended, the second connection position is provided with a MOS tube Q3, the third connection position is provided with a resistor R4, the fourth connection position is provided with a resistor R5, the fifth connection position is provided with a MOS tube Q4, the seventh connection position is provided with a capacitor EC3, and the eighth connection position is provided with a synchronous rectifier circuit; in a second rectifier output mode, the first connection position, the third connection position, the fourth connection position, the sixth connection position, and the eighth connection position are suspended, and the second connection position is provided with a resistor R5, the fifth connection position is provided with a MOS tube Q4, the seventh connection position is provided with a capacitor EC3, and the eighth connection position is provided with a synchronous rectifier circuit. The diode D4 is set at the connection position, the diode D5 is set at the fifth connection position, and the capacitor EC3 is set at the seventh connection position; in the third rectification output mode, the third connection position, the fourth connection position and the eighth connection position are suspended, the diode D2 is set at the first connection position, the diode D4 is set at the second connection position, the diode D5 is set at the fifth connection position, the diode D3 is set at the sixth connection position, and the capacitor EC3 is set at the seventh connection position; through the above structure, the same PCB board can achieve three rectification modes: ordinary rectification, synchronous rectification, and bridge rectification, which reduces the design types of PCBs, greatly reduces inventory costs, and also reduces costs in product certification. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0012] Figure 1 This is a principle block diagram of an LED power supply;

[0013] Figure 2 It is a circuit schematic diagram of an LED power supply;

[0014] Figure 3 is a schematic diagram of a three-in-one output rectification control circuit in a first rectification output mode;

[0015] Figure 4 A circuit schematic diagram of a three-in-one output rectification control circuit in a first rectification output mode;

[0016] Figure 5 A circuit schematic diagram of a three-in-one output rectification control circuit in a second rectification output mode;

[0017] Figure 6 A circuit schematic diagram of a three-in-one output rectification control circuit in a third rectification output mode;

[0018] Figure 7 This is the circuit schematic diagram of the DC-DC conversion circuit. DETAILED DESCRIPTION

[0019] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0020] In the description of the present utility model, the meaning of "more than" is more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0021] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0023] Reference Figures 1 to 7 , a three-in-one output rectifier control circuit is applied to a PCB board, and a first connection position 31, a second connection position 32, a third connection position 33, a fourth connection position 34, a fifth connection position 35, a sixth connection position 36, a seventh connection position 37 and an eighth connection position 38 are provided on the PCB board;

[0024] The first end of the third winding of the transformer T1 is connected to the first end of the first connection position 31 and the first end of the second connection position 32; the second end of the first connection position 31, the first end of the seventh connection position 37, and the second end of the sixth connection position 36 are commonly connected to V+; the second end of the second connection position 32, the second end of the seventh connection position 37, the second end of the third connection position 33, the second end of the fourth connection position 34, and the second end of the fifth connection position 35 are commonly connected to V-; the second end of the third winding of the transformer T1 is connected to GNS; the third end of the third winding of the transformer T1 is commonly connected to the first end of the fifth connection position 35 and the first end of the sixth connection position 36; the third end of the second connection position 32, the first end of the third connection position 33, the first end of the fourth connection position 34, and the third end of the fifth connection position 35 are commonly connected to the eighth connection position 38.

[0025] In this utility model, the working principle is as follows:

[0026] ①Reference Figure 1-3 When designing the PCB board, the first connection position 31, the second connection position 32, the third connection position 33, the fourth connection position 34, the fifth connection position 35, the sixth connection position 36, the seventh connection position 37 and the eighth connection position 38 are reserved, and the connection lines between each connection position and the DC-DC conversion circuit 20 and the synchronous rectification circuit 40 are arranged, specifically, the connection lines between each connection position and the third winding of the transformer T1, the output terminal V+, the output terminal V- and the synchronous rectification circuit 40 are arranged;

[0027] ②Reference Figure 1-4In the first rectification output mode, the first connection bit 31 and the sixth connection bit 36 ​​are left floating, the second connection bit 32 sets the MOS transistor Q3, the third connection bit 33 sets the resistor R4, the fourth connection bit 34 sets the resistor R5, the fifth connection bit 35 sets the MOS transistor Q4, the seventh connection bit 37 sets the capacitor EC3, and the eighth connection bit 38 sets the synchronous rectification circuit 40;

[0028] Specifically, the drain of the MOS tube Q3 is connected to the first end of the third winding of the transformer T1 and the sixth pin of the synchronous rectification chip U2, the drain of the MOS tube Q4 is connected to the third end of the third winding of the transformer T1 and the fourth pin of the synchronous rectification chip U2, the source of the MOS tube Q3, the second end of the resistor R4, the second end of the capacitor EC3, the second end of the resistor R5, and the source of the MOS tube Q4 are connected to the output terminal V-, the first end of the resistor R4 and the source of the MOS tube Q3 are connected to the first pin of the synchronous rectification chip U2, the first end of the resistor R5 and the source of the MOS tube Q3 are connected to the eighth pin of the synchronous rectification chip U2, and the capacitor EC3 is connected between the output terminal V+ and the output terminal V-; synchronous rectification can be realized, and it is suitable for the case where the output voltage is low voltage and high current.

[0029] ③Reference Figure 1-3 5. In the second rectifier output mode, the first connection bit 31, the third connection bit 33, the fourth connection bit 34, the sixth connection bit 36 ​​and the eighth connection bit 38 are left floating, the second connection bit 32 is provided with a diode D4, the fifth connection bit 35 is provided with a diode D5 and the seventh connection bit 37 is provided with a capacitor EC3;

[0030] Specifically, the cathode of the diode D4 is connected to the first end of the third winding of the transformer T1, the second end of the third winding of the transformer T1 and one end of the capacitor EC3 are connected to the output terminal V+, the anode of the diode D4, the second end of the capacitor EC3, and the anode of the diode D5 are connected to the output terminal V-, and the cathode of the diode D5 is connected to the second end of the third winding of the transformer T1; ordinary rectification output can be achieved, which is suitable for the case where the output voltage is medium voltage, and the diodes D4 and D5 use ultra-fast recovery diodes, and the related devices of synchronous rectification do not need to be placed on the PCB.

[0031] ④Reference Figure 1-3 6. In the third rectifier output mode, the third connection bit 33, the fourth connection bit 34 and the eighth connection bit 38 are left floating, the first connection bit 31 is provided with a diode D2, the second connection bit 32 is provided with a diode D4, the fifth connection bit 35 is provided with a diode D5, the sixth connection bit 36 ​​is provided with a diode D3 and the seventh connection bit 37 is provided with a capacitor EC3;

[0032] Specifically, the anode of diode D2 and the cathode of diode D4 are connected to the first end of the third winding of transformer T1, the cathode of diode D2, the cathode of diode D3, and the first end of capacitor EC3 are connected to the output terminal V+, the anode of diode D4, the anode of diode D5, and the second end of capacitor EC3 are connected to the output terminal V-, the cathode of diode D5 and the anode of diode D3 are connected to the second end of the third winding of transformer T1; bridge rectification output can be achieved, which is suitable for the case where the output is high voltage, diode D2, diode D3, diode D4 and diode D5 use ultra-fast recovery diodes, and related devices of synchronous rectification do not need to be placed on the PCB.

[0033] ⑤ The advantage of the utility model is that through the above structure, the same PCB board can achieve three rectification modes: ordinary rectification, synchronous rectification, and bridge rectification, which reduces the design types of PCBs, greatly reduces inventory costs, and also reduces costs in product certification.

[0034] An LED power supply includes an input filter circuit 10, a DC-DC conversion circuit 20, a synchronous rectification circuit 40 and the output rectification control circuit 30;

[0035] The input filter circuit 10 is connected between the external power supply and the DC-DC conversion circuit 20;

[0036] The output rectification control circuit 30 is connected between the DC-DC conversion circuit 20 and the load;

[0037] The synchronous rectification circuit 40 is connected to the output rectification control circuit 30 .

[0038] As a preferred embodiment of the DC-DC conversion circuit 20, the DC-DC conversion circuit 20 includes a power chip U1, a resistor R1-3, a MOS tube Q1-2, an inductor L1, a transformer T1, a diode D1, a capacitor C1, a capacitor EC1-2 and a diode D6. The first end of the power chip U1 is connected to the power supply VCC; the second end of the power chip U1 is connected to the first end of the MOS tube Q1 through the resistor R1; the third end of the power chip U1 is connected to the second end of the MOS tube Q1, the first end of the inductor L1 and the third end of the MOS tube Q2; the third end of the MOS tube Q1 is connected to the output end of the input filter circuit 10; the fourth end of the power chip U1 is connected to the first end of the MOS tube Q2 through the resistor R2; the second end of the MOS tube Q2 is connected to GND, the fifth end of the power chip U1 is connected to the second end of the MOS tube Q2; the sixth end of the power chip U1 is connected to GND; the second end of the inductor L1 is connected to the first end of the first winding of the transformer T1; the second end of the first winding of the transformer T1 is connected to GND through the capacitor C1; the first end of the second winding of the transformer T1 is connected to the first end of the diode D1, and the second end of the second winding of the transformer T1 and the capacitor EC1 are connected to GND together; the diode D1 is connected to the capacitor EC1 and outputs the power supply VCC to supply power to the power chip U1; the first end of the fourth winding of the transformer T1 is connected to the first end of the capacitor EC2 through the diode D6 and outputs the power supply VDD; the second end of the fourth winding of the transformer T1 and the second end of the capacitor EC2 are connected to GNS together.

[0039] As a preferred embodiment of the synchronous rectification circuit 40, the synchronous rectification circuit 40 includes a synchronous rectification chip U2, a resistor R6 and a capacitor C2; the 7th pin of the synchronous rectification chip U2 is connected to the power supply VDD; the 1st pin of the synchronous rectification chip U2 is connected to the first end of the MOS tube Q3; the 8th pin of the synchronous rectification chip U2 is connected to the first end of the MOS tube Q4; the 4th pin of the synchronous rectification chip U2 is connected to the third end of the MOS tube Q4; the 6th pin of the synchronous rectification chip U2 is connected to the third end of the MOS tube Q3; the 2nd pin of the synchronous rectification chip U2 is connected to GNS; the 5th pin of the synchronous rectification chip U2 is respectively connected to the second end of the MOS tube Q3 and the second end of the MOS tube Q4.

[0040] In one embodiment, the LED power supply further includes a feedback compensation circuit 50 connected between the DC-DC conversion circuit 20, the output rectification control circuit 30 and V-.

[0041] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A three-in-one output rectification control circuit, characterized in that: Applied to a PCB board, the PCB board is provided with a first connection position (31), a second connection position (32), a third connection position (33), a fourth connection position (34), a fifth connection position (35), a sixth connection position (36), a seventh connection position (37) and an eighth connection position (38); The first end of the secondary winding of the transformer T1 is connected to the first end of the first connection position (31) and the first end of the second connection position (32); the second end of the first connection position (31), the first end of the seventh connection position (37), and the second end of the sixth connection position (36) are connected to V+; the second end of the second connection position (32), the second end of the seventh connection position (37), the second end of the third connection position (33), the second end of the fourth connection position (34), and the second end of the fifth connection position (35) are connected to V-; the second end of the secondary winding of the transformer T1 is connected to GNS; the third end of the secondary winding of the transformer T1 is connected to the first end of the fifth connection position (35) and the first end of the sixth connection position (36); the third end of the second connection position (32), the first end of the third connection position (33), the first end of the fourth connection position (34), and the third end of the fifth connection position (35) are connected to the eighth connection position (38); In the first rectification output mode, the first connection bit (31) and the sixth connection bit (36) are suspended, the second connection bit (32) is used to set the MOS transistor Q3, the third connection bit (33) is used to set the resistor R4, the fourth connection bit (34) is used to set the resistor R5, the fifth connection bit (35) is used to set the MOS transistor Q4, the seventh connection bit (37) is used to set the capacitor EC3, and the eighth connection bit (38) is used to set the synchronous rectification circuit (40); In the second rectification output mode, the first connection bit (31), the third connection bit (33), the fourth connection bit (34), the sixth connection bit (36) and the eighth connection bit (38) are suspended, the second connection bit (32) is provided with a diode D4, the fifth connection bit (35) is provided with a diode D5 and the seventh connection bit (37) is provided with a capacitor EC3; In the third rectification output mode, the third connection position (33), the fourth connection position (34) and the eighth connection position (38) are suspended, the first connection position (31) is provided with a diode D2, the second connection position (32) is provided with a diode D4, the fifth connection position (35) is provided with a diode D5, the sixth connection position (36) is provided with a diode D3 and the seventh connection position (37) is provided with a capacitor EC3.

2. The three-in-one output rectification control circuit according to claim 1, characterized in that: The synchronous rectification circuit (40) comprises a synchronous rectification chip U2, a resistor R6 and a capacitor C2; the seventh pin of the synchronous rectification chip U2 is connected to a power source VDD; the first pin of the synchronous rectification chip U2 is connected to the first end of the MOS tube Q3; the eighth pin of the synchronous rectification chip U2 is connected to the first end of the MOS tube Q4; the fourth pin of the synchronous rectification chip U2 is connected to the third end of the MOS tube Q4; the sixth pin of the synchronous rectification chip U2 is connected to the third end of the MOS tube Q3; the second pin of the synchronous rectification chip U2 is connected to GNS; and the fifth pin of the synchronous rectification chip U2 is respectively connected to the second end of the MOS tube Q3 and the second end of the MOS tube Q4.

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