Modularized positive pressure-to-negative pressure adjustable output device

Abstract

The embodiment of the invention discloses a modularized positive pressure-to-negative pressure adjustable output device, which is used for packaging all components in a unit, is convenient to install on circuit boards of various devices, is particularly suitable for application with limited space, and can be more flexibly integrated into an existing device. The device comprises an input voltage end; an output voltage terminal; a reference voltage end; a ground voltage end; a switch module; an inductor; the output filtering element is used for filtering and stabilizing the output voltage; the feedback module is used for acquiring a feedback signal, comparing the feedback signal with the reference voltage and outputting a control signal according to a comparison result; the control module is used for adjusting the duty ratio of the switch module according to the control signal so as to realize stability and adjustability of the output voltage; and the quasi-QFN packaging device is used for packaging the switch module, the inductor, the output filter element, the feedback module and the control module.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of power converters, and in particular to a modular positive voltage to negative voltage adjustable output device. Background Art

[0002] As the requirements for integration, volume, reliability and heat dissipation performance of electronic devices continue to increase, in applications such as power management and converters, especially those involving efficient voltage regulation and energy conversion, traditional electronic packaging technology has been unable to meet the various requirements of modern high-performance devices for compact design, heat dissipation and reliability.

[0003] In the prior art, common power management modules use discrete components or multiple packaging types to achieve the integration of different functions. These traditional technical methods connect modules through independent components, and often embed each module in different packaging layers. However, such a design has a large overall volume due to the dispersed layout of the modules, which cannot meet the demand for miniaturization of modern electronic devices. Summary of the invention

[0004] The embodiment of the present application provides a modular positive pressure to negative pressure adjustable output device, which can encapsulate all components in one unit, making it easy to install on circuit boards of various devices. It is particularly suitable for space-constrained applications and can be more flexibly integrated into existing devices.

[0005] The embodiment of the present application provides a modular positive pressure to negative pressure adjustable output device, comprising: An input voltage terminal, used for receiving a positive input voltage; Output voltage terminal, used for outputting adjustable negative voltage; A reference voltage terminal, used for receiving a reference voltage; A ground voltage terminal, used for providing a reference ground voltage; A switch module, comprising at least one high-side switch and at least one low-side switch, for controlling the flow direction of current; an inductor, connected between the switch module and the ground voltage terminal, for storing and transferring energy; An output filter element, connected between the output voltage terminal and the ground voltage terminal, for filtering and stabilizing the output voltage; A feedback module, used for obtaining a feedback signal, comparing the feedback signal with the reference voltage, and outputting a control signal according to the comparison result; A control module, used for adjusting the duty cycle of the switch module according to the control signal to achieve a stable and adjustable output voltage; A QFN-like packager is used to package the switch module, the inductor, the output filter element, the feedback module and the control module; the pins of the input voltage terminal, the output voltage terminal, the reference voltage terminal and the ground voltage terminal are arranged on the QFN-like packager.

[0006] Optionally, the control module is a DC-DC controller, and the DC-DC controller includes a HO pin, a LO pin, a FB pin, a VCC pin, and a GND pin; The HO pin is connected to the gate of the high-side switch and is used to control the on and off of the high-side switch; The LO pin is connected to the gate of the low-side switch and is used to control the on and off of the low-side switch; The FB pin is connected to the feedback module and is used to receive the control signal output by the feedback module; The VCC pin is connected to the input voltage terminal to provide an operating voltage for the DC-DC controller; The GND pin is connected to the ground voltage terminal.

[0007] Optionally, the feedback module includes a first voltage-dividing resistor, a second voltage-dividing resistor and a comparator; The first voltage-dividing resistor and the second voltage-dividing resistor are connected in series and connected between the output voltage terminal and the ground voltage terminal; The comparator includes a first input terminal, a second input terminal and an output terminal, the first input terminal is connected between the first voltage-dividing resistor and the second voltage-dividing resistor, the second input terminal is connected to the reference voltage terminal, and the output terminal is connected to the FB pin; the comparator obtains a feedback signal through the first input terminal, is used to compare the feedback signal with the reference voltage, and outputs a control signal to the FB pin according to the comparison result.

[0008] Optionally, when the feedback signal is greater than the reference voltage, the control signal output by the comparator is at a low level; when the feedback signal is less than the reference voltage, the control signal output by the comparator is at a high level.

[0009] Optionally, the DC-DC controller controls the on-time ratios of the high-side switch and the low-side switch in a complementary manner through output signals of the HO pin and the LO pin, wherein: When the HO pin outputs a high level, the high-side switch is turned on and the low-side switch is turned off; When the LO pin outputs a high level, the low-side switch is turned on and the high-side switch is turned off.

[0010] Optionally, when the control signal received by the FB pin is at a low level, the DC-DC controller reduces the on-time of the high-side switch, thereby reducing the adjustable negative voltage; when the control signal received by the FB pin is at a high level, the DC-DC controller increases the on-time of the high-side switch, thereby increasing the adjustable negative voltage.

[0011] Optionally, the DC-DC controller controls the HO pin to output a high level, so that the high-side switch is turned on and the low-side switch is turned off, and the adjustable negative voltage increases; the DC-DC controller controls the LO pin to output a high level, so that the high-side switch is turned off and the low-side switch is turned on, and the adjustable negative voltage decreases.

[0012] Optionally, the calculation formula of the adjustable negative voltage is: ‌ in, is the adjustable negative voltage, is the positive input voltage, is the duty cycle of the high-side switch.

[0013] Optionally, when the feedback signal and the reference voltage reach a dynamic balance, the calculation formula of the adjustable negative voltage is:

[0014] in, is the adjustable negative voltage, is the reference voltage.

[0015] Optionally, the switch module, the inductor, the output filter element, the feedback module and the control module are arranged on the top layer of the QFN-like package, and the input voltage terminal, the output voltage terminal, the reference voltage terminal and the ground voltage terminal are arranged on the bottom layer of the QFN-like package.

[0016] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages: The device adopts a modular design, and all components are packaged in one unit, reducing the need for complex wiring and external connections. The compact QFN package not only saves space, but also makes the device more suitable for on-board use. Due to the small package size, it is easy to install on the circuit board of various equipment, especially suitable for space-constrained applications, and can be more flexibly integrated into existing devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of a modular positive pressure to negative pressure adjustable output device in the embodiment of the present application; Figure 2 This is a structural schematic diagram of another embodiment of a modular positive pressure to negative pressure adjustable output device in the embodiment of the present application; Figure 3 It is a structural schematic diagram of an embodiment of the bottom of a QFN-like package in the embodiment of the present application. DETAILED DESCRIPTION

[0018] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation orientations of the various components or components.

[0019] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0020] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0021] In addition, the structures, proportions, sizes, etc. drawn in the drawings in the present application are only used to match the contents disclosed in the specification for the technical personnel in this field to understand and read, and are not used to limit the restrictive conditions under which the present application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present application without affecting the effects and purposes that can be achieved by the present application.

[0022] The following will be combined with the drawings in this application to clearly and completely describe the technical solutions in the application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] An embodiment of the present application provides a modular positive pressure to negative pressure adjustable output device, which is used to encapsulate all components in one unit, which is easy to install on the circuit boards of various devices. It is particularly suitable for space-constrained applications and can be more flexibly integrated into existing devices.

[0024] The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0025] See also Figure 1 In the embodiment of the present application, one embodiment of the modular positive pressure to negative pressure adjustable output device includes: An input voltage terminal, used for receiving a positive input voltage; Output voltage terminal, used for outputting adjustable negative voltage; A reference voltage terminal, used for receiving a reference voltage; A ground voltage terminal, used for providing a reference ground voltage; The switch module 1 includes at least one high-side switch 11 and at least one low-side switch 12, and is used to control the current flow direction; Inductor 2, connected between switch module 1 and ground voltage terminal, used for energy storage and energy transfer; An output filter element 3, connected between the output voltage terminal and the ground voltage terminal, for filtering and stabilizing the output voltage; The feedback module 4 is used to obtain a feedback signal, compare the feedback signal with a reference voltage, and output a control signal according to the comparison result; The control module 5 is used to adjust the duty cycle of the switch module 1 according to the control signal to achieve a stable and adjustable output voltage; The QFN-like packager 6 is used to encapsulate the switch module 1, the inductor 2, the output filter element 3, the feedback module 4 and the control module 5; the pins of the input voltage terminal, the output voltage terminal, the reference voltage terminal and the ground voltage terminal are set on the QFN-like packager 6.

[0026] The following introduces the various structures in the modular positive pressure to negative pressure adjustable output device: Input voltage terminal: Function: Receive positive input voltage from external power supply.

[0027] Function: This is the input terminal of the entire power supply device, which provides the required positive voltage for the circuit. This voltage can be a stable voltage from an external power supply, which is input through this port for use by other circuits inside the power supply device. Ensure that the device has sufficient input voltage to support subsequent voltage conversion and regulation operations.

[0028] Output voltage terminal: Function: Output an adjustable negative voltage to the load.

[0029] Function: This is the output end of the power supply device, which is used to pass the regulated negative voltage to the external load. Through the operation of the control circuit, the output negative voltage can be adjusted according to the demand. It provides a stable and adjustable negative voltage output, which can be flexibly adjusted according to the load requirements to meet the negative voltage requirements of various electrical equipment.

[0030] Reference voltage terminal: Function: Receive reference voltage for comparison.

[0031] Function: Provides a fixed reference voltage for comparison with the feedback signal. The reference voltage is the base voltage of the device. It does not change and provides a stable comparison standard. A stable reference voltage ensures accurate feedback control of the device and avoids unstable output voltage due to reference voltage fluctuations, thereby improving the accuracy and stability of the entire device.

[0032] Ground voltage terminal: Function: Provide reference ground voltage or ground potential.

[0033] Function: The ground voltage terminal is the reference point for all voltage measurements and controls. All signals are processed relative to this port. This port is usually grounded (connected to the ground potential) to provide a unified potential reference for the circuit. Ensure that the entire circuit has a unified potential reference to avoid interference or instability caused by different potentials in the circuit.

[0034] Switch module 1: Composition: at least includes a high-side switch 11 and a low-side switch 12.

[0035] Function: Control the direction and switching of current through the high-side and low-side switches 12 to adjust the path of current flow.

[0036] Function: The high-side switch 11 controls the current from the input power supply to the inductor 2, while the low-side switch 12 controls the current from the inductor 2 to the ground potential. By continuously switching these switches on and off, the cycle and duty cycle of the current flow can be adjusted to control the output voltage. By accurately controlling the working state of the switch, the output voltage can be efficiently adjusted while ensuring the stability and efficiency of the conversion process. The precise control of the switch module 1 helps to achieve a smooth output of negative voltage and reduce voltage fluctuations.

[0037] Inductor 2: Location: Connected between switch module 1 and the ground voltage terminal.

[0038] Function: Inductor 2 is used to store and transfer energy. It temporarily stores and releases electrical energy when the current changes.

[0039] Function: When the high-side switch 11 is turned on, current passes through the inductor 2, and the inductor 2 stores electrical energy as a magnetic field; when the high-side switch 11 is turned off, the inductor 2 releases the stored energy to maintain the flow of current. This energy transfer and conversion helps to achieve voltage regulation. By storing and releasing energy, the inductor 2 smoothes current fluctuations, which helps to stabilize the output voltage, avoid voltage spikes or overshoots caused by switching actions, and ensure that the output voltage is more stable and accurate.

[0040] Output filter element 3: Position: Connect between the output voltage terminal and the ground voltage terminal.

[0041] Function: Output filter element 3 is used to smooth voltage fluctuations, remove high-frequency noise, and stabilize voltage output.

[0042] Function: Since the operating frequency of the switch module 1 is high, high-frequency noise may be generated during current conversion. Filter elements (such as capacitors) are used to absorb this noise, smooth the output voltage, and make the output more stable. The output filter element 3 can remove the high-frequency noise and pulsation of the power supply output, reduce voltage fluctuations, and ensure the smooth output of negative voltage. Stable voltage output is conducive to improving the working reliability of subsequent circuits or loads.

[0043] Feedback module 4: Function: Get the feedback signal of the output voltage, compare it with the reference voltage, and output the control signal.

[0044] Function: The feedback module 4 collects part of the output voltage signal through the voltage divider resistor and compares it with the reference voltage. If the output voltage is inconsistent with the reference voltage, the feedback module 4 will generate a control signal to adjust the duty cycle of the switch module 1 through the control module 5 to ensure the stability of the output voltage. The feedback module 4 ensures that the device can dynamically adjust according to the difference between the actual output voltage and the reference voltage to maintain the stability of the output voltage and avoid unstable output voltage due to changes in external load or fluctuations in input voltage.

[0045] Control module 5: Function: Adjust the duty cycle of the switch module 1 according to the control signal of the feedback module 4.

[0046] Function: Control module 5 is the "brain" of the entire device. It adjusts the duty cycle of the high-side and low-side switches 12 according to the feedback signal, thereby adjusting the current change in the inductor 2, and finally achieving a stable output of negative voltage. Control module 5 may adjust the duty cycle based on PWM (pulse width modulation) technology to achieve precise voltage regulation. The precise adjustment function of control module 5 ensures the stability and adjustability of the output voltage, can quickly respond to changes in the load, adjust the transfer and conversion of the current, thereby optimizing the performance of the power supply and ensuring the reliable operation of the equipment.

[0047] QFN-like package 6: Function: Encapsulate the switch module 1, the inductor 2, the output filter element 3, the feedback module 4 and the control module 5 into a unified module.

[0048] Function: This packaging form allows each electronic component to be efficiently integrated in a miniaturized structure, reducing the space occupied by the device and facilitating installation and maintenance. The QFN package provides excellent heat dissipation performance and high-density integration, making the entire power supply device compact and easy to dissipate heat, suitable for application scenarios with limited space or high efficiency requirements. The compact design of the package helps to improve the reliability of the device and reduce the production cost of the device.

[0049] In this embodiment, the QFN-like package 6 integrates multiple key components (such as the switch module 1, the inductor 2, the output filter element 3, the feedback module 4 and the control module 5) into a compact package. Through this integration, the volume of the device is greatly reduced. At the same time, the QFN package has excellent heat dissipation performance, which can efficiently dissipate heat in a small space to ensure stable operation of the device.

[0050] The device adopts a modular design, and all components are packaged in one unit, reducing the need for complex wiring and external connections. This design not only facilitates production and installation, but also makes the device more flexible and can be adjusted and replaced according to needs. The modular design makes the entire device more compact and can integrate more functions in a limited space. Due to the modular design, standardized components and processes can be used in the manufacturing process, thereby reducing production costs. In addition, the multiple functions integrated in the package reduce the need for external components, further reducing costs. The modular design also makes maintenance and replacement easier, reducing the cost of long-term maintenance. The modular design simplifies the operation of the entire device because the user only needs to deal with the packaged unit without having to pay attention to complex component connections and debugging. This design can reduce the number of operating steps and improve the convenience of use. The compact QFN package not only saves space, but also makes the device more suitable for on-board use. Due to the small package size, it is easy to install on the circuit board of various equipment, especially suitable for space-constrained applications, and can be more flexibly integrated into existing devices. The QFN-like package 6 integrates multiple components into a compact package with excellent heat dissipation performance, which can not only reduce the size and adapt the device to space-constrained applications, but also improve reliability, reduce the risk of mechanical damage and electrical failure, and ensure long-term stable operation. At the same time, the modular design makes the device easier to produce and maintain, reduces costs, and is simple to operate and easy to integrate into existing equipment. The easy on-board use makes the device more flexible to adapt to a variety of different application environments, especially in scenarios with limited space.

[0051] At the same time, through the precise cooperation between the feedback module 4 and the control module 5, the device can accurately adjust the output negative voltage and keep the output voltage stable under load changes and input voltage fluctuations. The output filter element 3 effectively removes high-frequency noise and voltage fluctuations to ensure smooth and accurate power output.

[0052] Optionally, the control module 5 is a DC-DC controller, and the DC-DC controller includes a HO pin, a LO pin, a FB pin, a VCC pin, and a GND pin; HO pin, connected to the gate of the high-side switch 11, for controlling the on and off of the high-side switch 11; An LO pin connected to the gate of the low-side switch 12 and used to control the on and off of the low-side switch 12; The FB pin is connected to the feedback module 4 and is used to receive the control signal output by the feedback module 4; VCC pin, connected to the input voltage terminal, provides operating voltage for the DC-DC controller; GND pin, connected to the ground voltage terminal.

[0053] In this embodiment, the HO and LO pins are used to control the on and off of the high-side and low-side switches 12, so that the output voltage can be accurately adjusted to avoid output fluctuations and ensure the stability of the device. The design of the DC-DC controller ensures efficient voltage conversion, and by adjusting the duty cycle, it can quickly respond to load changes and optimize the power conversion efficiency. The use of a DC-DC controller can integrate multiple functions into one module, reduce the complexity of the external circuit, and reduce the difficulty and cost of device design.

[0054] Optionally, the feedback module 4 includes a first voltage-dividing resistor, a second voltage-dividing resistor and a comparator; The first voltage-dividing resistor and the second voltage-dividing resistor are connected in series and connected between the output voltage terminal and the ground voltage terminal; The comparator includes a first input terminal, a second input terminal and an output terminal, the first input terminal is connected between the first voltage-dividing resistor and the second voltage-dividing resistor, the second input terminal is connected to the reference voltage terminal, and the output terminal is connected to the FB pin; the comparator obtains a feedback signal through the first input terminal, is used to compare the feedback signal with the reference voltage, and outputs a control signal to the FB pin according to the comparison result.

[0055] In the present embodiment, the feedback module 4 is composed of a first voltage-dividing resistor, a second voltage-dividing resistor and a comparator, the two voltage-dividing resistors are connected in series between the output voltage terminal and the ground voltage terminal, and are used to divide the output voltage signal. The two input terminals of the comparator are respectively connected to the voltage-dividing resistor and the reference voltage terminal, which is used to compare the difference between the feedback signal and the reference voltage, and output a control signal to the FB pin. The output voltage is monitored in real time by the feedback module 4, compared with the reference voltage, and the output is adjusted according to the difference to ensure that the output voltage is stable. The combination of the voltage-dividing resistor and the comparator can accurately feedback the output voltage, optimize the control accuracy, and ensure that the output voltage matches the target value.

[0056] Optionally, when the feedback signal is greater than the reference voltage, the control signal output by the comparator is a low level; when the feedback signal is less than the reference voltage, the control signal output by the comparator is a high level.

[0057] In this embodiment, when the feedback signal is greater than the reference voltage, the comparator outputs a low level. When the feedback signal is less than the reference voltage, the comparator outputs a high level. By outputting different control signals through the comparator, the duty cycle of the switch is accurately adjusted, thereby achieving detailed output voltage control. In addition, it is possible to quickly respond to the dynamic changes between the feedback signal and the reference voltage, ensuring the real-time and sensitivity of the voltage adjustment.

[0058] Optionally, the DC-DC controller controls the on-time ratio of the high-side switch 11 and the low-side switch 12 in a complementary manner through the output signals of the HO pin and the LO pin, wherein: When the HO pin outputs a high level, the high-side switch 11 is turned on and the low-side switch 12 is turned off; When the LO pin outputs a high level, the low-side switch 12 is turned on and the high-side switch 11 is turned off.

[0059] In this embodiment, the on-time ratio of the high-side and low-side switches 12 is controlled by the complementary signals of the HO pin and the LO pin. Specifically, when the HO pin outputs a high level, the high-side switch 11 is turned on and the low-side switch 12 is turned off; when the LO pin outputs a high level, the low-side switch 12 is turned on and the high-side switch 11 is turned off. The complementary control method enables the high-side and low-side switches 12 to work alternately, thereby ensuring the continuity of current flow, reducing conversion losses, and improving efficiency. Through efficient switch control, the current flow can be accurately adjusted in different working modes, the output voltage fluctuation can be optimized, and the stability of the device can be enhanced.

[0060] Optionally, when the control signal received by the FB pin is at a low level, the DC-DC controller reduces the on-time of the high-side switch 11, thereby reducing the adjustable negative voltage; when the control signal received by the FB pin is at a high level, the DC-DC controller increases the on-time of the high-side switch 11, thereby increasing the adjustable negative voltage.

[0061] In this embodiment, the DC-DC controller adjusts the on-time of the high-side switch 11 according to the control signal received by the FB pin. Specifically, when the control signal is at a low level, the DC-DC controller reduces the on-time of the high-side switch 11, thereby reducing the adjustable negative voltage; when the control signal is at a high level, the DC-DC controller increases the on-time of the high-side switch 11, thereby increasing the adjustable negative voltage. By adjusting the on-time of the high-side switch 11 according to the feedback signal, the increase or decrease of the output voltage can be accurately controlled to ensure that the voltage is adjusted within a predetermined range. It can quickly respond to load changes and input voltage fluctuations, ensure that the output voltage always meets the requirements, and improve the performance of the device.

[0062] Optionally, the DC-DC controller controls the HO pin to output a high level, so that the high-side switch 11 is turned on and the low-side switch 12 is turned off, and the adjustable negative voltage increases; the DC-DC controller controls the LO pin to output a high level, so that the high-side switch 11 is turned off and the low-side switch 12 is turned on, and the adjustable negative voltage decreases.

[0063] In this embodiment, the DC-DC controller controls the on-time of the high-side and low-side switches 12 in a complementary manner by controlling the output signals of the HO pin and the LO pin, thereby increasing or decreasing the adjustable negative voltage. Specifically, when the HO pin outputs a high level, the high-side switch 11 is turned on, the low-side switch 12 is turned off, and the negative voltage increases; when the LO pin outputs a high level, the low-side switch 12 is turned on, the high-side switch 11 is turned off, and the negative voltage decreases. This control method makes the alternating operation of the high-side and low-side switches 12 more precise, and can accurately adjust the negative voltage as needed to meet different load requirements. By accurately controlling the working state of the switch, it is possible to reduce energy loss, improve power supply efficiency, and reduce heat generation of the device.

[0064] The optional, adjustable negative voltage is calculated as: ‌ in, is an adjustable negative voltage, is the positive input voltage, is the duty cycle of the high-side switch 11.

[0065] Optionally, when the feedback signal and the reference voltage reach a dynamic balance, the calculation formula of the adjustable negative voltage is:

[0066] in, is an adjustable negative voltage, is the reference voltage.

[0067] In this embodiment, the calculation of the adjustable negative voltage is determined by Formula 1 and Formula 2, wherein Formula 1 calculates the duty cycle D based on the input voltage and the high-side switch 11, and Formula 2 is based on the ratio of the reference voltage and the voltage divider resistor. When the feedback signal reaches a dynamic balance with the reference voltage, the device enters a stable state, and the output voltage remains accurate and stable. This balance is monitored and adjusted in real time by the feedback module 4 to ensure that the output voltage matches the reference voltage, and the device can respond quickly and adjust the voltage when the load changes and the input voltage fluctuates to avoid instability. Dynamic balance not only ensures accurate voltage control, but also improves the stability and response speed of the device, so that the power supply can operate efficiently and stably under various working conditions.

[0068] Optionally, the switch module 1, the inductor 2, the output filter element 3, the feedback module 4 and the control module 5 are arranged on the top layer of the QFN-like package 6, and the input voltage terminal, the output voltage terminal, the reference voltage terminal and the ground voltage terminal are arranged on the bottom layer of the QFN-like package 6.

[0069] In this embodiment, the switch module 1, the inductor 2, the output filter element 3, the feedback module 4 and the control module 5 are arranged on the top layer of the QFN-like package 6, while the input voltage terminal, the output voltage terminal, the reference voltage terminal and the ground voltage terminal are arranged on the bottom layer of the QFN-like package 6. Since the QFN package adopts a pinless design (bottom pad), the component can be directly soldered to the surface of the PCB through surface mounting technology (SMT). The pins on the bottom layer of the package can directly contact the pads of the PCB, which simplifies the soldering process and improves the reliability of the soldering, making it suitable for automated production and shortening the production cycle. This not only improves the heat dissipation capacity and integration of the device, but also greatly simplifies the process of soldering to the PCB, ensuring efficient and reliable production and assembly.

[0070] See also Figures 2 to 3 Another embodiment of the modular positive pressure to negative pressure adjustable output device in the embodiment of the present application includes: Input voltage terminal, output voltage terminal, reference voltage terminal, ground voltage terminal, switch module (including a high-side switch MOS tube Q1 and a low-side switch MOS tube Q2, used to control the current flow direction), inductor L1, capacitors Cin and Cout, feedback module, DC-DC controller and QFN-like packager.

[0071] The feedback module includes a comparator, a resistor R1, a resistor R2, a resistor R3, and a capacitor C1; and the DC-DC controller includes a Vin pin, a HO pin, a LO pin, a FB pin, and a GND pin.

[0072] The input voltage terminal, the output voltage terminal, the reference voltage terminal and the ground voltage terminal are arranged on the bottom layer of the QFN-like package, so as to facilitate soldering on the PCB board, and other components are arranged on the top layer of the QFN package.

[0073] The Vin pin of the DC-DC controller is connected to the input voltage terminal, the GND pin is connected to the ground voltage terminal, the HO pin is connected to the high-side switch MOS tube Q1, the LO pin is connected to the low-side switch MOS tube Q2, and the FB pin is connected to the output terminal of the comparator. One end of the high-side switch MOS tube Q1 is connected to the input voltage terminal, and the other end is connected to the low-side switch MOS tube Q2. The low-side switch MOS tube Q2 is connected to the capacitor Cout, and the capacitor Cout is connected to the ground voltage terminal, and the low-side switch MOS tube Q2 and the capacitor Cout are connected to the output voltage terminal. One end of L1 is connected between the high-side switch MOS tube Q1 and the low-side switch MOS tube Q2, and the other end is connected to the ground voltage terminal. One end of the capacitor Cin is connected to the input voltage terminal, and the other end is connected to the output voltage terminal. Resistors R1 and R2 are connected in series, and resistor R1 is connected to the output voltage terminal, and resistor R2 is connected to the ground voltage terminal. The comparator includes an inverting input terminal, a non-inverting input terminal and an output terminal, wherein the output terminal is connected to the FB pin of the DC-DC controller; the inverting input terminal is connected between the resistor R1 and the resistor R2; the non-directional input terminal is connected to the resistor R3, and is connected to the reference voltage terminal through the resistor R3, and a capacitor C1 is connected between the resistor R3 and the non-inverting input terminal, and the other end of the capacitor C1 is connected to the ground voltage terminal.

[0074] Specifically, in a possible implementation, the QFN-like package is a 50mm*50mm, 1.6mm thick FR-4 PCB board with a single-sided layout. The B side (bottom layer) is composed of several large pads (input voltage terminal, output voltage terminal, reference voltage terminal and ground voltage terminal), which introduce the positive input voltage Vin, the reference voltage Vref, and the reference ground voltage GND, and lead out the adjustable negative voltage Vout; the A side (top layer) is used to place all other components. The entire module can be soldered on the main control PCB board like the QFN chip. Under the power supply of +48V, this modular positive voltage to negative voltage adjustable output device can achieve -1V to -36V, 0 to 20A output, a wide adjustment range, and an output power of up to 500W.

[0075] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modular positive pressure to negative pressure adjustable output device, characterized in that: include: An input voltage terminal, used for receiving a positive input voltage; Output voltage terminal, used for outputting adjustable negative voltage; A reference voltage terminal, used for receiving a reference voltage; A ground voltage terminal, used for providing a reference ground voltage; A switch module, comprising at least one high-side switch and at least one low-side switch, for controlling the flow direction of current; an inductor, connected between the switch module and the ground voltage terminal, for storing and transferring energy; An output filter element, connected between the output voltage terminal and the ground voltage terminal, for filtering and stabilizing the output voltage; A feedback module, used for obtaining a feedback signal, comparing the feedback signal with the reference voltage, and outputting a control signal according to the comparison result; A control module, used for adjusting the duty cycle of the switch module according to the control signal to achieve a stable and adjustable output voltage; A QFN-like packager is used to package the switch module, the inductor, the output filter element, the feedback module and the control module; the pins of the input voltage terminal, the output voltage terminal, the reference voltage terminal and the ground voltage terminal are arranged on the QFN-like packager.

2. The device according to claim 1, characterized in that The control module is a DC-DC controller, and the DC-DC controller includes a HO pin, a LO pin, a FB pin, a VCC pin, and a GND pin; The HO pin is connected to the gate of the high-side switch and is used to control the on and off of the high-side switch; The LO pin is connected to the gate of the low-side switch and is used to control the on and off of the low-side switch; The FB pin is connected to the feedback module and is used to receive the control signal output by the feedback module; The VCC pin is connected to the input voltage terminal to provide an operating voltage for the DC-DC controller; The GND pin is connected to the ground voltage terminal.

3. The device according to claim 2, characterized in that The feedback module includes a first voltage-dividing resistor, a second voltage-dividing resistor and a comparator; The first voltage-dividing resistor and the second voltage-dividing resistor are connected in series and connected between the output voltage terminal and the ground voltage terminal; The comparator includes a first input terminal, a second input terminal and an output terminal, the first input terminal is connected between the first voltage-dividing resistor and the second voltage-dividing resistor, the second input terminal is connected to the reference voltage terminal, and the output terminal is connected to the FB pin; the comparator obtains a feedback signal through the first input terminal, is used to compare the feedback signal with the reference voltage, and outputs a control signal to the FB pin according to the comparison result.

4. The device according to claim 3, characterized in that When the feedback signal is greater than the reference voltage, the control signal output by the comparator is at a low level; when the feedback signal is less than the reference voltage, the control signal output by the comparator is at a high level.

5. The device according to claim 3, characterized in that The DC-DC controller controls the conduction time ratio of the high-side switch and the low-side switch in a complementary manner through the output signals of the HO pin and the LO pin, wherein: When the HO pin outputs a high level, the high-side switch is turned on and the low-side switch is turned off; When the LO pin outputs a high level, the low-side switch is turned on and the high-side switch is turned off.

6. The device according to claim 5, characterized in that When the control signal received by the FB pin is at a low level, the DC-DC controller reduces the on-time of the high-side switch, thereby reducing the adjustable negative voltage; when the control signal received by the FB pin is at a high level, the DC-DC controller increases the on-time of the high-side switch, thereby increasing the adjustable negative voltage.

7. The device according to claim 6, characterized in that The DC-DC controller controls the HO pin to output a high level, so that the high-side switch is turned on and the low-side switch is turned off, and the adjustable negative voltage increases; the DC-DC controller controls the LO pin to output a high level, so that the high-side switch is turned off and the low-side switch is turned on, and the adjustable negative voltage decreases.

8. The device according to claim 6, characterized in that The calculation formula of the adjustable negative voltage is: ‌ in, is the adjustable negative voltage, is the positive input voltage, is the duty cycle of the high-side switch.

9. The device according to claim 3, characterized in that When the feedback signal and the reference voltage reach a dynamic balance, the calculation formula of the adjustable negative voltage is: in, is the adjustable negative voltage, is the reference voltage.

10. The device according to any one of claims 1 to 9, characterized in that The switch module, the inductor, the output filter element, the feedback module and the control module are arranged on the top layer of the QFN-like package, and the input voltage terminal, the output voltage terminal, the reference voltage terminal and the ground voltage terminal are arranged on the bottom layer of the QFN-like package.

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