Synchronous rectification controller

Abstract

The utility model relates to the technical field of controllers, in particular to a synchronous rectification controller, which comprises an output power switch, a control chip, a silicon charge chip, an anode pin and a cathode pin. The control chip comprises a charge pump circuit and a logic operation and driving circuit; a charge pump circuit, a logic operation and driving circuit and a power switch are respectively connected between the anode pin and the cathode pin; the logic operation and driving circuit is connected with the charge pump circuit and the power switch respectively; and a silicon charge chip is connected between the charge pump circuit and the anode pin. According to the utility model, the output voltage ripple is small and the efficiency is high through the charge pump circuit, the silicon charge chip is a device which is not sensitive to packaging stress and temperature, and no pulling force is generated in the horizontal direction during solid crystal welding, so that the stability of the output voltage is further improved; the synchronous rectification controller is simple in structure and capable of accurately providing reference voltage, ensuring stability of output voltage, reducing voltage ripples, improving reliability and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to controller technical field, especially a synchronous rectifier controller. BACKGROUND

[0002] With the vigorous development of electronic technology, synchronous rectifier controller has been widely applied in electronic equipment such as power adapter. At present, limited by the size, reliability stability, overall cost, how to meet the miniaturization of modern product and the flexibility of application end use, and keep the high performance and low cost of device become the hotspot of present research.

[0003] The synchronous rectifier controller in prior art encapsulates power supply circuit, voltage determination circuit, logic circuit, energy storage capacitor and MOS tube in a package body through corresponding connecting structure to improve the effect of ac-dc conversion circuit. However, the internal circuit structure of the synchronous rectifier controller has the problems of poor reference voltage detection precision, insufficient driving capacity and poor reliability of integrated ceramic capacitor, which can easily lead to poor stability of output voltage, voltage ripple and low reliability. UTILITY MODEL CONTENTS

[0004] The utility model discloses a synchronous rectifier controller, which can improve the stability of output voltage and reduce voltage ripple.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0006] A synchronous rectifier controller, comprising an output power switch, a control chip, a silicon charge chip, an anode pin and a cathode pin.

[0007] The control chip comprises a charge pump circuit and a logic operation and driving circuit.

[0008] The anode pin and the cathode pin are respectively connected with the charge pump circuit, the logic operation and driving circuit and the power switch.

[0009] The logic operation and driving circuit is respectively connected with the charge pump circuit and the power switch.

[0010] The silicon charge chip is connected between the charge pump circuit and the anode pin.

[0011] The silicon charge chip is thinner and smaller than a traditional ceramic capacitor (MLCC); the silicon charge chip has a DC bias characteristic, the capacitance of the silicon charge chip changes very little with DC bias; the silicon charge chip has a temperature characteristic, the capacitance changes very little with temperature, and the silicon charge chip does not have a piezoelectric effect, so the product itself does not resonate due to voltage changes, and there is no howling; the silicon charge chip adopts a bottom electrode or a planar double electrode structure, and there is no electrode on the side, so that no pulling force is generated in the horizontal direction during die bonding and welding, and the phenomenon of reflow soldering and patching of the vertical monument can be effectively avoided.

[0012] The starting voltage of a traditional synchronous rectification controller needs to reach 1.5V or more, and the synchronous rectification controller cannot work normally when the input voltage is lower than 1.5V. The charge pump circuit can work in a step-up and step-down mode, and the minimum working voltage can reach 0.3V. The voltage stored in the silicon charge chip after being stepped up by the charge pump circuit can provide a stable working voltage for the control circuit.

[0013] The synchronous rectification controller has a small output voltage ripple and high efficiency, the silicon charge chip is not sensitive to packaging stress and temperature, and no pulling force is generated in the horizontal direction during die bonding and welding, so that the output voltage stability is further improved. The synchronous rectification controller has a simple structure, can accurately provide a reference voltage, ensures the stability of the output voltage, reduces the voltage ripple, and improves the reliability. The synchronous rectification controller has a low forward voltage drop and an ultra-low starting voltage, and can be applied to the field requiring a low forward voltage drop, such as solar photovoltaic bypass diode application and various isolation diode application scenarios.

[0014] As a preferred technical scheme of the utility model, the output power switch and the control chip are integrated into one integrated circuit chip.

[0015] As a preferred technical scheme of the utility model, the output power switch adopts a MOSFET device.

[0016] As a preferred technical scheme of the utility model, the output power switch adopts a GaN device or a SiC device.

[0017] As a preferred technical scheme of the utility model, the silicon charge chip adopts a silicon capacitor device.

[0018] As a preferred technical scheme of the utility model, the output power switch, the control chip and the silicon charge chip are arranged on a metal frame.

[0019] The metal frame is connected with the cathode pin.

[0020] the anode pin is connected to the output power switch, the control chip and the silicon charge chip through wires respectively;

[0021] the output power switch is connected to the control chip through the wire;

[0022] the silicon charge chip is connected to the control chip through the wire;

[0023] the control chip is connected to the metal frame through the wire;

[0024] the metal frame, the anode pin and the cathode pin are packaged in a package body, and the anode pin and the cathode pin extend out of the package body.

[0025] As a preferred technical scheme of the utility model, the output power switch and the control chip are arranged on the metal frame;

[0026] the metal frame is connected to the cathode pin;

[0027] the silicon charge chip is arranged on the anode pin and communicates with the anode pin;

[0028] the anode pin is connected to the output power switch and the control chip through wires respectively;

[0029] the output power switch is connected to the control chip through the wire;

[0030] the silicon charge chip is connected to the control chip through the wire;

[0031] the control chip is connected to the metal frame through the wire;

[0032] the silicon charge chip, the metal frame, the anode pin and the cathode pin are packaged in a package body, and the anode pin and the cathode pin extend out of the package body.

[0033] As a further preferred technical scheme of the utility model, the metal frame and the cathode pin are integrally formed.

[0034] As a further preferred technical scheme of the utility model, the package body adopts an epoxy resin component.

[0035] In summary, due to the adoption of the above technical scheme, the utility model has the beneficial effects of:

[0036] The utility model discloses a synchronous rectifier controller, through the charge pump circuit output voltage ripple little, high efficiency, the silicon charge chip is not sensitive device to the packaging stress and temperature, when the fixed crystal welding, the horizontal direction will not produce the tension, to further improve output voltage stability, the synchronous rectifier controller simple structure can accurate provision reference voltage, guarantee output voltage stability, reduce voltage ripple, improve reliability etc. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is the schematic diagram of the principle of synchronous rectifier controller;

[0038] Figure 2 It is the structure schematic diagram of a kind of synchronous rectifier controller;

[0039] Figure 3 It is the structure schematic diagram of another synchronous rectifier controller.

[0040] Marked in drawing: 1-output power switch, 2-control chip, 21-charge pump circuit, 22-logic operation and driving circuit, 3-silicon charge chip, 4-conductor, 5-metal frame, 6-package, 7-anode pin, 8-cathode pin. DETAILED DESCRIPTION

[0041] The utility model will be further described in detail in combination with test example and specific implementation. But this should not be understood as the range of the above-mentioned subject matter of the utility model is limited to the following examples, and any technology realized based on the content of the utility model belongs to the scope of the utility model.

[0042] In the description of the specific embodiments of the utility model, the orientation or positional relationship of the expression terms appearing in the description, such as "up", "down", "left", "right", "center", "inside" and "outside", are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the utility model product / device / apparatus when it is usually used. These orientation or positional relationship terms are only used to facilitate the description of the utility model scheme or to simplify the description in the specific embodiments, so as to facilitate the quick understanding of the scheme by the technicians, and are not intended to indicate or imply that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship, so it cannot be understood as a limitation on the utility model.

[0043] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding device / component / element is absolutely horizontal or vertical or overhanging or parallel, but can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Alternatively, it can be simplified to understand that the corresponding device / component / element is arranged in the direction of "horizontal", "vertical", "overhanging", "parallel" and the like, and can have an error / deviation of ±10% relative to the corresponding direction, more preferably an error / deviation of ±8%, more preferably an error / deviation of ±6%, more preferably an error / deviation of ±5%, more preferably an error / deviation of ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the utility model scheme.

[0044] In addition, the terms "first", "second", "third" and the like in the terms are only used to distinguish the same or similar components for description, and should not be understood as emphasizing or implying the relative importance of the specific components.

[0045] In addition, in the description of the embodiments of the utility model, "several", "a plurality of", "several" represent at least 2. It can be 2, 3, 4, 5, 6, 7, 8, 9 and any other situation, or even more than 9.

[0046] In addition, in the description of the technical scheme of the utility model, unless otherwise specified / limited / limited, the terms "set", "install", "connect", "connect", "set", "lay", "arrange" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, such as welding, riveting, bolting, screwing and other commonly used connection means in the art. The connection can be mechanical connection, electrical connection or communication connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements.

[0047] In the related art, the existing technology of the synchronous rectification controller, such as the synchronous diode disclosed in the Chinese patent application with the publication number CN104953859A, encapsulates the power supply circuit, the voltage determination circuit, the logic circuit, the energy storage capacitor and the MOS tube in a package through the corresponding connection structure, but the internal circuit structure has poor reference voltage detection accuracy, insufficient driving capacity, poor reliability of integrated ceramic capacitors, which can easily lead to poor stability of the output voltage, voltage ripple, high heat and low reliability. Therefore, the technical scheme of the present application is generated, which is described below in combination with Figures 1 to 3 .

[0048] Embodiment 1

[0049] As Figure 1 And Figure 2 The utility model discloses a synchronous rectification controller, including output power switch 1, control chip 2, silicon charge chip 3, wire 4, metal frame 5, encapsulation 6, anode pin 7 and cathode pin 8.

[0050] As Figure 1 The control chip 2 includes charge pump circuit 21 and logic operation and drive circuit 22, and the anode pin 7 and the cathode pin 8 are connected respectively charge pump circuit 21, logic operation and drive circuit 22 and power switch 1, and the logic operation and drive circuit 22 are connected respectively charge pump circuit 21 and power switch 1, and the charge pump circuit 21 and the anode pin 7 are connected silicon charge chip 3, and the silicon charge chip 3 adopts silicon capacitor device.

[0051] As Figure 2 The silicon charge chip 3 adopts the structure form of plane double electrode, and the output power switch 1, the control chip 2 and the silicon charge chip 3 are all arranged on the metal frame 5, and the metal frame 5 is connected with the cathode pin 8, and specifically can select the metal frame 5 with the cathode pin 8 integrally formed and arranged.

[0052] As Figure 2 The anode pin 7 is connected respectively output power switch 1, control chip 2 and silicon charge chip 3 through wire 4, and the output power switch 1 is connected control chip 2 through wire 4, and the silicon charge chip 3 is connected control chip 2 through wire 4, and the control chip 2 is connected metal frame 5 through wire 4.

[0053] As Figure 2 The metal frame 5, the anode pin 7 and the cathode pin 8 are encapsulated in encapsulation 6, and the anode pin 7 and the cathode pin 8 extend out of the encapsulation 6, and the encapsulation 6 can adopt epoxy resin member.

[0054] In an optional embodiment, the output power switch 1 and the control chip 2 are integrated into an integrated circuit chip.

[0055] In some optional embodiments, the output power switch 1 adopts MOSFET device.

[0056] In some optional embodiments, the output power switch 1 adopts GaN device or SiC device.

[0057] The silicon charge chip 3 is thinner and smaller than a traditional ceramic capacitor (MLCC); the silicon charge chip 3 has a DC bias characteristic, the capacitance of the silicon charge chip 3 changes very little with the DC bias; the temperature characteristic of the silicon charge chip 3 makes the capacitance change very little with temperature, and the silicon charge chip 3 does not have a piezoelectric effect, so the product itself does not resonate due to voltage changes, and there is no howling; the silicon charge chip 3 adopts a bottom electrode or a planar double electrode structure, and there is no electrode on the side, so that no pulling force is generated in the horizontal direction during die bonding and welding, and the phenomenon of reflow soldering and patching is effectively avoided.

[0058] The starting voltage of a traditional synchronous rectification controller needs to reach 1.5V or more, and the synchronous rectification controller cannot work normally when the input voltage is lower than 1.5V. The charge pump circuit 21 can work in a step-up and step-down mode, and the minimum working voltage can reach 0.3V. The voltage stored in the silicon charge chip 3 after being stepped up by the charge pump circuit 21 can provide a stable working voltage for the control circuit.

[0059] The synchronous rectification controller has a small output voltage ripple and high efficiency, and the silicon charge chip 3 is not sensitive to packaging stress and temperature, so that no pulling force is generated in the horizontal direction during die bonding and welding, thereby further improving the output voltage stability. The synchronous rectification controller has a simple structure, can accurately provide a reference voltage, ensures the stability of the output voltage, reduces the voltage ripple, improves the reliability, and the like. Meanwhile, the synchronous rectification controller has a low forward voltage drop and an ultra-low starting voltage, and its application scenarios can be expanded from ordinary power secondary side rectification to other fields requiring a low forward voltage drop, such as solar photovoltaic bypass diode applications and various isolation diode application scenarios.

[0060] Embodiment 2

[0061] As shown in Figure 1 and Figure 3 The synchronous rectification controller differs from the embodiment 1 in that the silicon charge chip 3 adopts a bottom electrode structure in the embodiment.

[0062] As shown in Figure 3 The output power switch 1 and the control chip 2 are arranged on the metal frame 5; the metal frame 5 is connected with the cathode pin 8, and the metal frame 5 and the cathode pin 8 can be integrally formed.

[0063] As shown in Figure 3As shown, the silicon charge chip 3 is disposed on the anode pin 7. Since the silicon charge chip 3 adopts the bottom electrode structure, the silicon charge chip 3 is connected to the anode pin 7.

[0064] like Figure 3 As shown, the anode pin 7 is connected to the output power switch 1 and the control chip 2 respectively via wire 4; the output power switch 1 is connected to the control chip 2 via wire 4; the silicon charge chip 3 is connected to the control chip 2 via wire 4; and the control chip 2 is connected to the metal frame 5 via wire 4.

[0065] like Figure 3 As shown, the silicon charge chip 3, the metal frame 5, the anode pin 7 and the cathode pin 8 are packaged in a package body 6, and the anode pin 7 and the cathode pin 8 extend out of the package body 6.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A synchronous rectification controller characterized by, The output power switch (1), the control chip (2), the silicon charge chip (3), the anode pin (7) and the cathode pin (8) are arranged on the metal frame (5). The control chip (2) comprises a charge pump circuit (21) and a logic operation and driving circuit (22). The anode pin (7) and the cathode pin (8) are connected with the charge pump circuit (21), the logic operation and driving circuit (22) and the power switch (1) respectively. The logic operation and driving circuit (22) is connected with the charge pump circuit (21) and the power switch (1) respectively. The silicon charge chip (3) is connected between the charge pump circuit (21) and the anode pin (7).

2. The synchronous rectification controller of claim 1, wherein, The output power switch (1) and the control chip (2) are integrated into one integrated circuit chip.

3. The synchronous rectification controller of claim 1, wherein, The output power switch (1) adopts a MOSFET device.

4. The synchronous rectification controller of claim 1, wherein, The output power switch (1) adopts a GaN device or a SiC device.

5. The synchronous rectification controller of claim 1, wherein, The silicon charge chip (3) adopts a silicon capacitor device.

6. The synchronous rectification controller of claim 1, wherein, The output power switch (1), the control chip (2) and the silicon charge chip (3) are arranged on the metal frame (5). The metal frame (5) is connected with the cathode pin (8). The anode pin (7) is connected with the output power switch (1), the control chip (2) and the silicon charge chip (3) through the wire (4) respectively. The output power switch (1) is connected with the control chip (2) through the wire (4). The silicon charge chip (3) is connected with the control chip (2) through the wire (4). The control chip (2) is connected with the metal frame (5) through the wire (4). The metal frame (5), the anode pin (7) and the cathode pin (8) are packaged in the package body (6), and the anode pin (7) and the cathode pin (8) extend out of the package body (6).

7. The synchronous rectification controller of claim 1, wherein, The output power switch (1) and the control chip (2) are arranged on the metal frame (5). The metal frame (5) is connected with the cathode pin (8). The silicon charge chip (3) is arranged on the anode pin (7) and communicates with the anode pin (7). The anode pin (7) is connected with the output power switch (1) and the control chip (2) through the wire (4) respectively. The output power switch (1) is connected with the control chip (2) through the wire (4). The silicon charge chip (3) is connected with the control chip (2) through the wire (4). The control chip (2) is connected with the metal frame (5) through the wire (4). The silicon charge chip (3), the metal frame (5), the anode pin (7) and the cathode pin (8) are packaged in the package body (6), and the anode pin (7) and the cathode pin (8) extend out of the package body (6).

8. A synchronous rectification controller as claimed in claim 6 or 7, characterized in that, The metal frame (5) and the cathode pin (8) are integrally formed.

9. The synchronous rectification controller of claim 6 or 7, wherein, The package body (6) adopts an epoxy resin component.

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