Rectification control circuit of laptop adapter

Abstract

The utility model relates to a rectification control circuit of a notebook adapter. The rectification control circuit of the notebook adapter comprises an input module, a rectification module and an output module, the rectifier module comprises a chip PU1, a switch unit and a current-limiting filter unit, the chip PU1 is electrically connected with the input module, the switch unit is electrically connected with the chip PU1, and the current-limiting filter unit is electrically connected with the chip PU1; the output module is electrically connected with the current-limiting filtering unit. According to the scheme provided by the invention, stable voltage can be output, a TL431 voltage stabilizer is replaced, and complex external resistors and other elements are abandoned.

Description

Technical Field

[0001] This utility model relates to the field of circuit design technology, and in particular to a rectifier control circuit for a laptop adapter. Background Technology

[0002] The main function of a laptop adapter is to convert alternating current (AC) into direct current (DC) to provide the necessary power to the laptop.

[0003] In related technologies, most laptop adapters currently use the TL431 voltage regulator as their voltage regulation circuit. This regulator compares and amplifies the output voltage with the input reference voltage to control its stability, thus enabling rapid response to load changes and maintaining a stable output voltage. However, the TL431 regulator requires high precision and stability from its external resistors and other components, and its circuitry is relatively complex. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a rectifier control circuit for a notebook adapter that can replace the TL431 voltage regulator and eliminate complex external resistors and other components.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] The first aspect of this application provides a rectifier control circuit for a notebook adapter, including an input module; the rectifier module includes a chip PU1, a switching unit, and a current limiting filter unit, wherein the chip PU1 is electrically connected to the input module, the switching unit is electrically connected to the chip PU1, and the current limiting filter unit is electrically connected to the chip PU1; and an output module is electrically connected to the current limiting filter unit.

[0007] The switching unit includes resistor PR1, resistor PR2, MOSFET PQ1, and MOSFET PQ2. The first end of resistor PR1 is electrically connected to chip PU1. The second end of resistor PR1 is electrically connected to the first end of resistor PR2 and the first end of MOSFET PQ1. The second end of resistor PR2 and the second end of MOSFET PQ1 are electrically connected to the first end of MOSFET PQ2. The second end of MOSFET PQ2 is grounded.

[0008] The switching unit includes resistor PR4, resistor PR5, MOSFET PQ3, and MOSFET PQ4. The first end of resistor PR4 is electrically connected to chip PU1. The second end of resistor PR4 is electrically connected to the first end of resistor PR5 and the first end of MOSFET PQ3. The second end of resistor PR5 and the second end of MOSFET PQ3 are electrically connected to the first end of MOSFET PQ4. The second end of MOSFET PQ4 is grounded.

[0009] The current limiting filter unit includes capacitor PEC3, capacitor PC9, resistor PR3, and capacitor PC5. The first terminal of capacitor PEC3 is electrically connected to chip PU1, and the second terminal of capacitor PEC3 is grounded. The first terminal of capacitor PC9 is electrically connected to the first terminal of capacitor PEC3, and the second terminal of capacitor PC9 is grounded. The first terminal of resistor PR3 is electrically connected to chip PU1, and the first terminal of capacitor PC5 is electrically connected to the second terminal of resistor PR3, and the second terminal of capacitor PC5 is grounded.

[0010] The input module includes a transformer T1, a capacitor PC6, a capacitor PC7, and a capacitor PC8. The first terminal of the capacitor PC6 is electrically connected to the transformer T1, and the second terminal of the capacitor PC6 is grounded. The first terminal of the capacitor PC7 is electrically connected to the first terminal of the capacitor PC6, and the second terminal of the capacitor PC7 is grounded. The first terminal of the capacitor PC8 is electrically connected to both the transformer T1 and the chip PU1, and the second terminal of the capacitor PC8 is grounded.

[0011] The input module also includes a capacitor PC4, the first end of which is electrically connected to the transformer T1, and the second end of which is grounded.

[0012] The input module diode PD1 also includes an electrical connection between the first end of the diode PD1 and the transformer T1, and an electrical connection between the second end of the diode PD1 and the chip PU1.

[0013] The input module also includes capacitors PC1, PC2, and PC3. The first terminal of capacitor PC1 is electrically connected to the transformer T1, and the second terminal of capacitor PC1 is grounded. The first terminal of capacitor PC2 is electrically connected to the first terminal of capacitor PC1, and the second terminal of capacitor PC2 is grounded. The first terminal of capacitor PC3 is electrically connected to both the transformer T1 and the chip PU1, and the second terminal of capacitor PC3 is grounded.

[0014] The output module includes a plug-in terminal PCON1, which is electrically connected to the second end of the resistor PR3.

[0015] The output module also includes capacitors PEC1 and PEC2. The first end of capacitor PEC1 is electrically connected to the plug-in terminal PCON1, and the second end of capacitor PEC1 is grounded. The first end of capacitor PEC2 is electrically connected to the plug-in terminal PCON1, and the second end of capacitor PEC2 is grounded.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] By setting up input, rectification, and output modules, a stable voltage can be output, replacing the TL431 voltage regulator and eliminating complex external resistors and other components. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0019] Figure 1 This is a functional block diagram of the rectifier control circuit of a laptop adapter according to one embodiment of the present invention;

[0020] Figure 2 This is a circuit diagram of the rectifier control circuit of a notebook adapter according to one embodiment of the present invention. Detailed Implementation

[0021] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0022] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0025] Please see Figure 1 and Figure 2 A rectifier control circuit for a notebook adapter includes an input module 100, a rectifier module 200, and an output module 300. The rectifier module 200 includes a chip PU1, a switching unit, and a current limiting filter unit. The chip PU1 is electrically connected to the input module 100, the switching unit is electrically connected to the chip PU1, and the current limiting filter unit is electrically connected to the chip PU1. The output module 300 is electrically connected to the current limiting filter unit.

[0026] It should be noted that the input module 100 receives the startup voltage. The chip PU1 is model TEA2095TE, which integrates a PFC correction circuit and an LLC resonant circuit. This highly integrated built-in circuit simplifies the product's hardware design and reduces the need for external components. Furthermore, the TEA2095TE has an interlock function, effectively preventing the simultaneous activation of external MOSFET gate drivers, thus requiring a delay of at least 200ns. The TEA2095TE's built-in circuit, working in conjunction with external hardware circuits, improves output efficiency, reduces switching losses, and minimizes harmonic distortion. The TEA2095TE also features overvoltage, overcurrent, and overtemperature protection, and its low-power design aligns with the important characteristics of rectifier circuits. Due to its high efficiency, low power consumption, and high integration, the TEA2095TE is widely used in various power supply designs and is suitable for applications requiring high reliability and energy efficiency. The output module 300 provides a highly stable voltage to laptop devices.

[0027] Thus, the above circuit replaces the TL431 voltage regulator, eliminating complex external resistors and other components, reducing costs while improving the stability of the voltage output.

[0028] Please see Figure 2In one embodiment, the switching unit includes resistors PR1 and PR2, MOSFETs PQ1 and PQ2. The first terminal of resistor PR1 is electrically connected to chip PU1. The second terminal of resistor PR1 is electrically connected to the first terminal of resistor PR2 and the first terminal of MOSFET PQ1. The second terminal of resistor PR2 and the second terminal of MOSFET PQ1 are electrically connected to the first terminal of MOSFET PQ2. The second terminal of MOSFET PQ2 is grounded. Specifically, the switching unit includes resistors PR4 and PR5, MOSFETs PQ3 and PQ4. The first terminal of resistor PR4 is electrically connected to chip PU1. The second terminal of resistor PR4 is electrically connected to the first terminal of resistor PR5 and the first terminal of MOSFET PQ3. The second terminal of resistor PR5 and the second terminal of MOSFET PQ3 are electrically connected to the first terminal of MOSFET PQ4. The second terminal of MOSFET PQ4 is grounded.

[0029] It should be noted that the switching unit works in conjunction with the chip PU1 to switch the circuit on and off.

[0030] Please see Figure 2 In one embodiment, the current limiting filter unit includes capacitor PEC3, capacitor PC9, resistor PR3 and capacitor PC5. The first terminal of capacitor PEC3 is electrically connected to chip PU1, and the second terminal of capacitor PEC3 is grounded. The first terminal of capacitor PC9 is electrically connected to the first terminal of capacitor PEC3, and the second terminal of capacitor PC9 is grounded. The first terminal of resistor PR3 is electrically connected to chip PU1, and the first terminal of capacitor PC5 is electrically connected to the second terminal of resistor PR3, and the second terminal of capacitor PC5 is grounded.

[0031] It should be noted that the current limiting filter unit plays the role of current limiting and filtering.

[0032] Please see Figure 2In one embodiment, the input module 100 includes a transformer T1, capacitors PC6, PC7, and PC8. The first terminal of capacitor PC6 is electrically connected to the transformer T1, and the second terminal of capacitor PC6 is grounded. The first terminal of capacitor PC7 is electrically connected to the first terminal of capacitor PC6, and the second terminal of capacitor PC7 is grounded. The first terminal of capacitor PC8 is electrically connected to both the transformer T1 and the chip PU1, and the second terminal of capacitor PC8 is grounded. Specifically, the input module 100 also includes a capacitor PC4, whose first terminal is electrically connected to the transformer T1, and its second terminal is grounded. Furthermore, the input module 100 includes a diode PD1, whose first terminal is electrically connected to the transformer T1, and whose second terminal is electrically connected to the chip PU1. Specifically, the input module 100 also includes capacitors PC1, PC2 and PC3. The first end of capacitor PC1 is electrically connected to transformer T1 and the second end of capacitor PC1 is grounded. The first end of capacitor PC2 is electrically connected to the first end of capacitor PC1 and the second end of capacitor PC2 is grounded. The first end of capacitor PC3 is electrically connected to transformer T1 and chip PU1 respectively, and the second end of capacitor PC3 is grounded.

[0033] It should be noted that the input module 100 is used to receive the external start-up voltage.

[0034] Please see Figure 2 In one embodiment, the output module 300 includes a plug-in terminal PCON1, which is electrically connected to the second terminal of the resistor PR3. Specifically, the output module 300 also includes capacitors PEC1 and PEC2. The first terminal of capacitor PEC1 is electrically connected to the plug-in terminal PCON1, and the second terminal of capacitor PEC1 is grounded. The first terminal of capacitor PEC2 is electrically connected to the plug-in terminal PCON1, and the second terminal of capacitor PEC2 is grounded.

[0035] It should be noted that the output module 300 is used to output voltage to the laptop device.

[0036] The circuit principle of this application is explained below:

[0037] The primary coil of transformer T1 is electrically connected to the pre-amplifier circuit of the adapter. The AC-DC converter provides a 24V startup voltage to the overall circuit, enabling it to quickly enter operating mode. Upon receiving the input voltage, the primary coil of transformer T1 generates an alternating magnetic field. In this field, the iron core forms an alternating magnetic flux, and the primary coil outputs magnetic induction. According to Faraday's law of electromagnetic induction, the secondary coil, under magnetic induction, generates an induced electromotive force signal, thus outputting three sets of voltage signals. Of these three voltage signals output by transformer T1, pins 3 and 5 are externally connected to multi-stage filter capacitors PC1, PC2, PC3, PC6, PC7, and PC8 to filter out interference signals after the magnetic induction conversion, subsequently outputting DSA and DSB voltages. Pin 4 is externally connected to capacitor PC4 for filtering, and then electrically connected to diode PD1 for half-wave rectification, outputting voltage VCC1.

[0038] Chip PU1's 7-pin is electrically connected to the VCC1 voltage of input module 100, providing the operating voltage for rectifier module 200 and enabling the chip's built-in circuitry to enter the working state. Secondly, the DSA voltage is connected to the drain pins of MOSFETs PQ1 and PQ2, and also to pin 6 of chip PU1, detecting the feedback signal from the MOSFET drain and serving as a synchronization timing control signal. Similarly, the DSB voltage is connected to the drain pins of MOSFETs PQ3 and PQ4, and also to pin 3 of chip PU1, detecting the feedback signal from the MOSFET drain and serving as a synchronization timing control signal. Chip PU1's 8-pin is electrically connected to one end of current-limiting resistor PR1, and the other end is connected to the gate of component PQ1, and through current-limiting resistor PR2... The gate of MOSFET PQ2 is connected; pin 1 of chip PU1 is also connected to one end of current-limiting resistor PR4, and the other end is connected to the gate of MOSFET PQ3. Similarly, it is electrically connected to the gate of MOSFET PQ4 through current-limiting resistor PR5. Chip PU1 controls the switching state of the two sets of MOSFETs according to the timing signal; pin 5 is connected to the source of MOSFETs PQ1 and PQ2 for detection feedback, and pin 4 is connected to the source of MOSFETs PQ3 and PQ4 for detection feedback; finally, pin 2 of chip PU1 is grounded to form a closed loop.

[0039] When chip PU1 detects a positive drain voltage on pins 3 and 6 of the MOSFET, it outputs a signal through its built-in circuit to drive the gate circuit, pulling pins 1 and 8 low. Conversely, when a negative drain voltage is detected, chip PU1 can output a high level on pins 1 and 8, thereby controlling the on / off state of the two MOSFET circuits. When the voltage difference between the drain detection voltage (pins 3 and 6) and the source detection voltage (pins 4 and 5) of chip PU1 is higher than the Vact threshold voltage of the MOSFET, the built-in circuit outputs a high level to drive the gate circuit of the MOSFET, thereby turning on and synchronously rectifying the MOSFET circuit. Conversely, when the voltage difference is lower than the Vact threshold voltage, the built-in circuit outputs a low level to drive the gate of the MOSFET to the off state. Therefore, chip PU1 achieves synchronous rectification control output by detecting the differential voltage between the drain and source of the MOSFET.

[0040] In addition to the VCC1 voltage connection chip PU1, the input module 100 is also electrically connected to capacitors PEC3 and PC9. After being fed to the current-limiting resistor PR3, the voltage is filtered by capacitor PC5 and output to ground as VCC2 voltage. After the rectifier module 200 outputs a high-stability voltage, it is connected to capacitors PEC1 and PEC2 to filter out high-frequency crosstalk signals, and then connected to pins 1, 2, 3, and 4 of the output module 300's connector PCON1 to provide rectified control voltage to the external laptop computer.

[0041] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.

[0042] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A rectifier control circuit for a laptop adapter, characterized in that, include: Input module; The rectifier module includes a chip PU1, a switching unit, and a current limiting filter unit. The chip PU1 is electrically connected to the input module, the switching unit is electrically connected to the chip PU1, and the current limiting filter unit is electrically connected to the chip PU1. The model of the chip PU1 is TEA2095TE. An output module is electrically connected to the current limiting filter unit.

2. The rectifier control circuit of the notebook adapter according to claim 1, characterized in that, The switching unit includes resistor PR1, resistor PR2, MOSFET PQ1, and MOSFET PQ2. The first end of resistor PR1 is electrically connected to chip PU1. The second end of resistor PR1 is electrically connected to the first end of resistor PR2 and the first end of MOSFET PQ1. The second end of resistor PR2 and the second end of MOSFET PQ1 are electrically connected to the first end of MOSFET PQ2. The second end of MOSFET PQ2 is grounded.

3. The rectifier control circuit of the notebook adapter according to claim 1, characterized in that, The switching unit includes resistor PR4, resistor PR5, MOSFET PQ3, and MOSFET PQ4. The first end of resistor PR4 is electrically connected to chip PU1. The second end of resistor PR4 is electrically connected to the first end of resistor PR5 and the first end of MOSFET PQ3. The second end of resistor PR5 and the second end of MOSFET PQ3 are electrically connected to the first end of MOSFET PQ4. The second end of MOSFET PQ4 is grounded.

4. The rectifier control circuit of the notebook adapter according to claim 2, characterized in that, The current limiting filter unit includes capacitor PEC3, capacitor PC9, resistor PR3, and capacitor PC5. The first terminal of capacitor PEC3 is electrically connected to chip PU1, and the second terminal of capacitor PEC3 is grounded. The first terminal of capacitor PC9 is electrically connected to the first terminal of capacitor PEC3, and the second terminal of capacitor PC9 is grounded. The first terminal of resistor PR3 is electrically connected to chip PU1, and the first terminal of capacitor PC5 is electrically connected to the second terminal of resistor PR3, and the second terminal of capacitor PC5 is grounded.

5. The rectifier control circuit of the notebook adapter according to claim 1, characterized in that, The input module includes a transformer T1, a capacitor PC6, a capacitor PC7, and a capacitor PC8. The first terminal of the capacitor PC6 is electrically connected to the transformer T1, and the second terminal of the capacitor PC6 is grounded. The first terminal of the capacitor PC7 is electrically connected to the first terminal of the capacitor PC6, and the second terminal of the capacitor PC7 is grounded. The first terminal of the capacitor PC8 is electrically connected to both the transformer T1 and the chip PU1, and the second terminal of the capacitor PC8 is grounded.

6. The rectifier control circuit of the notebook adapter according to claim 5, characterized in that, The input module also includes a capacitor PC4, the first end of which is electrically connected to the transformer T1, and the second end of which is grounded.

7. The rectifier control circuit of the notebook adapter according to claim 5, characterized in that, The input module diode PD1 also includes an electrical connection between the first end of the diode PD1 and the transformer T1, and an electrical connection between the second end of the diode PD1 and the chip PU1.

8. The rectifier control circuit of the notebook adapter according to claim 5, characterized in that, The input module also includes capacitors PC1, PC2, and PC3. The first terminal of capacitor PC1 is electrically connected to the transformer T1, and the second terminal of capacitor PC1 is grounded. The first terminal of capacitor PC2 is electrically connected to the first terminal of capacitor PC1, and the second terminal of capacitor PC2 is grounded. The first terminal of capacitor PC3 is electrically connected to both the transformer T1 and the chip PU1, and the second terminal of capacitor PC3 is grounded.

9. The rectifier control circuit of the notebook adapter according to claim 4, characterized in that, The output module includes a plug-in terminal PCON1, which is electrically connected to the second end of the resistor PR3.

10. The rectifier control circuit of the notebook adapter according to claim 9, characterized in that, The output module also includes capacitors PEC1 and PEC2. The first end of capacitor PEC1 is electrically connected to the plug-in terminal PCON1, and the second end of capacitor PEC1 is grounded. The first end of capacitor PEC2 is electrically connected to the plug-in terminal PCON1, and the second end of capacitor PEC2 is grounded.

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