Stable module load power supply device

Abstract

The utility model provides a stable module load power supply device which comprises an input filtering unit, a rectification filtering unit, a voltage reduction unit and a low-voltage power supply unit. The voltage reduction unit comprises a high-voltage chip and a double-winding transformer; the input filtering unit is connected with the rectification filtering unit, the rectification filtering unit is connected with the high-voltage chip, the high-voltage chip is connected with the double-winding transformer in a common-ground mode, the double-winding transformer is connected with the low-voltage power supply unit, and the low-voltage power supply unit is connected with load modules such as wifi, Bluetooth and electrodeless modules needing power supply so as to achieve power supply. According to the technical scheme of the utility model, part of elements between the input and the output of the power supply are electrically isolated, part of elements are electrically non-isolated, and high-voltage impact caused by element damage or other faults can be reduced, so that module loads such as wifi, Bluetooth, electrodeless and the like are protected, and the service life of the power supply is prolonged. Through the step-down unit, the power supply device is neither completely isolated nor completely non-isolated, so that the problems that an existing power supply device is high in cost and expensive module loads such as wifi, Bluetooth, electrodeless and the like are easily damaged can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply circuits, and particularly relates to a stable power supply device for module loads. Background Art

[0002] In modern electronic devices, wireless communication modules such as Wi-Fi, Bluetooth, and wireless modules have become important components for connecting devices to the network. These modules usually require a stable and reliable power supply to ensure their normal operation and communication quality.

[0003] Most of the front-end power supply parts of the existing power supply devices adopt an isolation mode or a non-isolation mode. The isolation mode requires additional isolation components such as high-voltage chips, dual-winding transformers, and optocouplers to provide electrical isolation between the input and output of the power supply. The transformer windings use the sandwich winding method to enhance the isolation effect, resulting in high manufacturing costs due to the need for additional isolation components. The non-isolation mode has no electrical isolation between the input and output of the power supply. Compared with the isolation mode, the non-isolation mode does not require additional isolation components, so the cost is lower. However, the output end is easily affected by the input end, which may lead to potential damage to expensive module loads such as Wi-Fi, Bluetooth, and wireless.

[0004] Therefore, the existing power supply devices have problems of high cost or easy damage to module loads. Summary of the Utility Model

[0005] In order to overcome the above technical defects, the utility model provides a stable power supply device for module loads, which can solve the problems of high cost and easy damage to module loads existing in the existing power supply devices.

[0006] To solve the above problems, the utility model is implemented according to the following technical solutions:

[0007] A stable power supply device for module loads includes: an input filtering unit, a rectifying and filtering unit, a buck unit, and a low-voltage power supply unit;

[0008] The buck unit includes: a high-voltage chip and a dual-winding transformer;

[0009] The input filtering unit is connected to the rectifying and filtering unit, the rectifying and filtering unit is connected to the high-voltage chip, the high-voltage chip and the dual-winding transformer are connected to the same ground, and the dual-winding transformer is connected to the low-voltage power supply unit.

[0010] The input filtering unit is used to receive high-voltage alternating current and filter it;

[0011] The rectifying and filtering unit is used to convert high-voltage alternating current into high-voltage direct current and filter the high-voltage direct current;

[0012] The step-down unit is used to convert high-voltage direct current into low-voltage direct current;

[0013] The low-voltage power supply unit is used to output low-voltage direct current to the module load.

[0014] Compared with the prior art, the beneficial effects of a stable module load power supply device provided by the present utility model are as follows: by forming a step-down unit with a high-voltage chip and a dual-winding transformer, there is partial electrical isolation between the input and output of the power supply. By grounding the high-voltage chip and the dual-winding transformer together, there is partial electrical non-isolation between the input and output of the power supply. It can also reduce the high-voltage impact caused by component damage, thereby protecting the module load. Through the step-down unit, the power supply device is neither completely in an isolation mode nor completely in a non-isolation mode, so the problems of high cost or easy damage to the module load existing in the existing power supply devices can be solved.

[0015] Optionally, the input filtering unit includes: an input port, a filtering capacitor, a common-mode filter, and a pressure relief resistor;

[0016] The input port is connected to an external power supply, and the external power supply is used to provide high-voltage alternating current;

[0017] The filtering capacitor is connected in parallel with the input port, the common-mode filter is connected in parallel with the input port, and the pressure relief resistor is connected in parallel with the common-mode filter.

[0018] Optionally, the input filtering unit further includes: a fuse and a varistor;

[0019] The fuse is connected in series with the input port, the varistor is connected in parallel with the input port, and the varistor is connected in series with the fuse.

[0020] Optionally, the first winding input end of the common-mode filter is connected to the second winding input end of the common-mode filter through a filtering capacitor;

[0021] The first winding output end of the common-mode filter is connected to the second winding output end of the common-mode filter through a filtering capacitor or a rectifying and filtering unit.

[0022] Optionally, the rectifying and filtering unit includes: a rectifier bridge and a filtering module;

[0023] The input end of the rectifier bridge is connected to the output end of the input filtering unit, the output end of the rectifier bridge is connected to the input end of the filtering module, and the output end of the filtering module is connected to the input end of the step-down unit.

[0024] Optionally, the low-voltage power supply unit includes: an output filtering module and an output port;

[0025] The input end of the output filtering module is connected to the output end of the step-down unit, the output end of the output filtering module is connected to the input end of the output port, and the output end of the output port is connected to the module load.

[0026] Optionally, the input end of the dual-winding transformer includes: an input terminal one and an input terminal two;

[0027] The output end of the dual-winding transformer includes: an output terminal one and an output terminal two;

[0028] The grounding end of the high-voltage chip is connected to the input terminal two and the output terminal two;

[0029] The output end of the high-voltage chip is connected to the input terminal one, and the output terminal two is connected to the low-voltage power supply unit.

[0030] Optionally, the output filtering module includes: a diode, an electrolytic capacitor, a resistor, and a chip capacitor;

[0031] The diode is connected to the output end of the bucking unit, the diode is in series with the output port, the electrolytic capacitor is in parallel with the output port, the resistor is in parallel with the output port; the chip capacitor is in parallel with the output port. Description of the Drawings

[0032] Figure 1 is the overall block diagram of the present utility model;

[0033] Figure 2 is the circuit diagram of the present utility model.

[0034] Description of the reference numerals: 1, input filtering unit; 2, rectifying and filtering unit; 3, bucking unit; 4, low-voltage power supply unit; 5, module load. Detailed Embodiment

[0035] The following is a description of the preferred embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present utility model, and are not used to limit the present utility model.

[0036] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0037] See Figure 1-2As shown in the figure, the utility model provides a stable power supply device for module load, which includes an input filtering unit 1, a rectifying and filtering unit 2, a step-down unit 3 and a low-voltage power supply unit 4. The input filtering unit 1 is used to receive the high-voltage alternating current of the external power supply and filter it. The rectifying and filtering unit 2 is used to convert the high-voltage alternating current output by the input filtering unit 1 into high-voltage direct current and filter the high-voltage direct current. The step-down unit 3 is used to convert the high-voltage direct current output by the rectifying and filtering unit 2 into low-voltage direct current. The low-voltage power supply unit 4 is used to output the low-voltage direct current output by the step-down unit 3 to the module load 5 to be powered.

[0038] The input filtering unit 1 includes an input port, filtering capacitors CX1 and CX2, common-mode filters LF1 and LF2, pressure relief resistors RX1 and RX2, a fuse F1, and a varistor RV1. The input port L is connected to the positive pole of the external power supply, the input port N is connected to the negative pole of the external power supply, the filtering capacitors CX1 and CX2 are connected in parallel with the input port, the common-mode filters LF1 and LF2 are connected in series with the input port, the branch where the pressure relief resistors RX1 and RX2 are connected in series is connected in parallel with the common-mode filter LF2, the fuse F1 is connected in series with the input port L, the varistor RV1 is connected in parallel with the input port, and the varistor RV1 is connected in series with the fuse F1.

[0039] The first winding input end of the common-mode filter LF1 is connected to the second winding input end of the common-mode filter LF1 through the filtering capacitor CX1, and the first winding output end of the common-mode filter LF1 is connected to the second winding output end of the common-mode filter LF1 through the filtering capacitor CX2. The first winding input end of the common-mode filter LF2 is connected to the second winding input end of the common-mode filter LF2 through the filtering capacitor CX2, and the first winding output end of the common-mode filter LF2 is connected to the second winding output end of the common-mode filter LF2 through a rectifier bridge.

[0040] The input port is used to connect to the high-voltage alternating current of an external power supply; the filter capacitors CX1 and CX2 are used to filter the high-voltage alternating current once and output it to the common-mode filter; the common-mode filters LF1 and LF2 are used to filter the high-voltage alternating current a second time, reducing the clutter of the high-voltage alternating current, making it more stable, reducing the voltage value fluctuation of the high-voltage alternating current, and thus reducing the voltage value fluctuation of the low-voltage alternating current output by the low-voltage power supply unit 4, and further reducing the voltage value fluctuation provided to the module load 5; the pressure relief resistors RX1 and RX2 are used to prevent the voltage remaining in the filter capacitors CX1 and CX2 from damaging other components of the power supply device when the power supply device stops supplying power to the module load 5; the fuse F1 and the varistor RV1 are used to protect other components of the power supply device. When the power supply device gets wet and short-circuits, etc., causing an excessive current, the fuse F1 melts. When the voltage value of the connected high-voltage alternating current is too high, the varistor RV1 can effectively absorb the excessive voltage. When the power supply device encounters these situations, it stops supplying power to the module load 5, playing a protective role.

[0041] The rectification and filtering unit 2 includes a rectifier bridge and a filtering module. The input end of the rectifier bridge is connected to the input filtering unit 1, the output end of the rectifier bridge is connected to the input end of the filtering module, and the output end of the filtering module is connected to the input end of the bucking unit 3; the rectifier bridge includes diodes D1, D2, D3, and D4, which are used to convert the high-voltage alternating current output by the input filtering module into high-voltage direct current; the filtering module includes electrolytic capacitors EC1 and EC2, which are used to filter the high-voltage direct current.

[0042] The bucking unit 3 includes a high-voltage chip U1 and a dual-winding transformer T1. The high-voltage chip U1 can be a chip of model S7141S or S7142S; the input end of the high-voltage chip U1 is connected to the output end of the rectification and filtering unit 2, the high-voltage chip U1 and the dual-winding transformer T1 are connected to the common ground, and the output end of the dual-winding transformer T1 is connected to the input end of the low-voltage module load 5.

[0043] The dual-winding transformer T1 includes an input terminal 1, an input terminal 2, an output terminal 1, and an output terminal 2; pin 6 of the dual-winding transformer is the input terminal 1, pin 8 is the input terminal 2, pin 4 is the output terminal 1, and pin 1 is the output terminal 2; pin 8 of the high-voltage chip U1 is the floating ground connection terminal, the ground terminal of the high-voltage chip U1 is connected to the input terminal 2 and the output terminal 2, pin 1 of the high-voltage chip is the output terminal, the output terminal of the high-voltage chip is connected to the input terminal 1, and the output terminal 1 is connected to the low-voltage module load 5.

[0044] The working principle of the step-down module is as follows: by using the ratio of resistors R2, R3, and R4 in the step-down unit 3, the FB pin of the high-voltage chip U1 is detected, and in cooperation with the high-frequency switching of the internal MOS transistor of the high-voltage chip U1 and the dual-winding transformer T1, the output voltage is modulated to achieve the purpose of stepping down from high-voltage direct current to low-voltage direct current.

[0045] By forming the step-down unit 3 with the high-voltage chip U1 and the dual-winding transformer T1, there is partial electrical isolation between the input and output of the power supply. By grounding the high-voltage chip U1 and the dual-winding transformer T1 together, there is partial electrical non-isolation between the input and output of the power supply. It can also reduce the high-voltage impact caused by abnormal conditions such as component damage, thereby protecting module loads 5 such as wifi, Bluetooth, and electrodeless. Through the common grounding connection of the high-voltage chip U1 and the dual-winding transformer T1 in the step-down unit 3, the power supply device is neither completely in the isolation mode nor completely in the non-isolation mode. Even if the front-end power supply part is damaged, it will not impact the module loads 5 such as wifi, Bluetooth, and electrodeless at the back end; when there is an abnormality in the non-isolation mode, it is easy to directly pour the high voltage of the front-end power supply part over and damage the expensive module loads 5 such as wifi, Bluetooth, and electrodeless. Therefore, through the step-down unit 3, the problems of high cost or easy damage to module loads 5 existing in the existing power supply device can be solved.

[0046] The low-voltage power supply unit 4 includes an output filter module and an output port. The output filter module of the low-voltage power supply part includes diode D5, electrolytic capacitor EC3, resistors R5, R6, and chip capacitors C3, C4; diode D5 is connected to the output end of the step-down unit 3, diode D5 is in series with the output port, electrolytic capacitor EC3 is in parallel with the output port, resistor R6 is in parallel with the output port, chip capacitor C4 is in parallel with the output port, and the output port is connected to module loads 5 such as wifi, Bluetooth, and electrodeless.

[0047] Due to the large turns ratio of the dual-winding transformer T1 and the sandwich winding method, even if the voltage change of the input winding is large, the voltage change of the output winding is not large. And after stepping down, it is output to the module load 5 through the low-voltage power supply unit 4. By connecting the large-capacity electrolytic capacitor EC3 in parallel with the chip capacitor C4 that absorbs high frequencies in the low-voltage power supply unit 4, the voltage ripple output to the module load 5 is small and stable; and since the transformer T1 is a dual-winding transformer, even if there is a connection between the input winding and the output winding, but because it is grounded together with the grounding end of the high-voltage chip U1, even if there is an abnormality in the front-end power supply part of the power supply device, it will not rush the high voltage of the external power supply to the module load 5, achieving the purpose of protecting the expensive module load 5.

[0048] The above is only the preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A stable module load power supply device, characterized in that: include: Input filter unit, rectifier filter unit, step-down unit and low-voltage power supply unit; The step-down unit includes: a high-voltage chip and a double-winding transformer; The input filter unit is connected to the rectifier filter unit, the rectifier filter unit is connected to the high-voltage chip, the high-voltage chip is commonly connected to the double-winding transformer, and the double-winding transformer is connected to the low-voltage power supply unit; The input filter unit is used to receive high voltage alternating current and filter it; The rectifying and filtering unit is used to convert the high-voltage alternating current into high-voltage direct current and filter the high-voltage direct current; The step-down unit is used to convert the high-voltage direct current into low-voltage direct current; The low-voltage power supply unit is used to output the low-voltage direct current to the module load.

2. A stable module load power supply device according to claim 1, characterized in that: The input filter unit includes: an input port, a filter capacitor, a common mode filter and a voltage relief resistor; The input port is connected to an external power source, and the external power source is used to provide the high voltage alternating current; The filter capacitor is connected in parallel with the input port, the common mode filter is connected in parallel with the input port, and the voltage relief resistor is connected in parallel with the common mode filter.

3. A stable module load power supply device according to claim 2, characterized in that: The input filter unit also includes: a fuse and a varistor; The fuse is connected in series with the input port, the varistor is connected in parallel with the input port, and the varistor is connected in series with the fuse.

4. A stable module load power supply device according to claim 3, characterized in that: The first winding input end of the common mode filter is connected to the second winding input end of the common mode filter through the filter capacitor; The first winding output end of the common mode filter is connected to the second winding output end of the common mode filter through the filter capacitor or the rectification and filtering unit.

5. A stable modular load power supply device according to claim 1, characterized in that: The rectification and filtering unit comprises: a rectification bridge and a filtering module; The input end of the rectifier bridge is connected to the output end of the input filter unit, the output end of the rectifier bridge is connected to the input end of the filter module, and the output end of the filter module is connected to the input end of the step-down unit.

6. A stable modular load power supply device according to claim 1, characterized in that: The low voltage power supply unit comprises: an output filter module and an output port; The input end of the output filter module is connected to the output end of the step-down unit, the output end of the output filter module is connected to the input end of the output port, and the output end of the output port is connected to the module load.

7. A stable modular load power supply device according to claim 1, characterized in that: The input end of the dual-winding transformer includes: an input end 1 and an input end 2; The output end of the dual-winding transformer includes: an output end 1 and an output end 2; The ground terminal of the high-voltage chip is connected to the two input terminals and the two output terminals; The output end of the high-voltage chip is connected to the input end, and the output end is connected to the low-voltage power supply unit.

8. A stable modular load power supply device according to claim 6, characterized in that: The output filter module includes: a diode, an electrolytic capacitor, a resistor and a chip capacitor; The diode is connected to the output end of the step-down unit, the diode is connected in series with the output port, the electrolytic capacitor is connected in parallel with the output port, the resistor is connected in parallel with the output port; and the chip capacitor is connected in parallel with the output port.

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