Voltage-stabilizing output power supply circuit and water dispenser

Abstract

The embodiment of the utility model provides a voltage-stabilizing output power supply circuit and a water dispenser, and the voltage-stabilizing output power supply circuit is characterized in that the input end of an input circuit is coupled with an external alternating-current power supply, and the output end of the input circuit outputs a direct-current power supply; the transformer comprises a primary coil, an auxiliary coil and a secondary coil; the secondary coil tap forms a sixth end; the sixth end and the fifth end form a first secondary coil, and the sixth end and the seventh end form a second secondary coil; the output end of the rectifier bridge is coupled with the first end; the power supply input end of the power supply chip is coupled with the second end; the power supply end is coupled to the fourth end; wherein the output end of one output circuit is coupled with the first secondary coil and / or the second secondary coil, and the output end of at least one output circuit is coupled with an external load; the feedback terminal is coupled to an output terminal of the at least one output circuit. Through the tap design of the secondary side coil of the transformer, a plurality of different voltages or currents are provided, the multi-point power supply requirement of the system is met, and dependence of an external converter is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power supply circuits, and in particular to a voltage-stabilized output power supply circuit and a water dispenser. Background Art

[0002] With the rapid development of electronic technology, multi-output power management technology has become a key element in the design of complex electronic systems. Multi-output power supply circuits are not only required to provide multiple independent and stable voltage or current outputs to meet the needs of different components, but also to ensure good isolation between these outputs to avoid interference and ensure the overall stable operation of the system. For example, set-top boxes, audio power amplifiers, data center servers, electric vehicle battery management systems, precision measurement equipment, etc. all require such efficient, multi-output power supply designs. Traditional voltage-regulated power supply designs are often limited to a single output or can provide a stable voltage, but when faced with multiple voltage requirements, additional converters or separate power modules are required, which increases the complexity, cost and volume of the system, reduces efficiency, and may introduce unnecessary electromagnetic interference problems. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a voltage-stabilized output power supply circuit and a water dispenser to solve the problems in the related art.

[0004] A first aspect of the present disclosure provides a voltage-stabilized output power supply circuit, comprising:

[0005] An input circuit, wherein the input end of the input circuit is coupled to an external AC power source, and the output end of the input circuit outputs a DC power source after being rectified by a rectifier bridge;

[0006] A transformer, the transformer comprising a primary coil, an auxiliary coil and a secondary coil;

[0007] The primary coil includes a first end and a second end; the auxiliary coil includes a third end and a fourth end; the secondary coil includes a fifth end, a sixth end and a seventh end; the secondary coil tap forms the sixth end; the sixth end and the fifth end form a first secondary coil, and the sixth end and the seventh end form a second secondary coil;

[0008] The output end of the rectifier bridge is coupled to the first end via a first resistor and a first inductor;

[0009] A power chip, the power chip comprising a power input terminal, a power supply terminal and a feedback terminal;

[0010] The power input terminal is coupled to the second terminal; the power supply terminal is coupled to the fourth terminal via a power supply circuit;

[0011] at least one output circuit, wherein an input terminal of the at least one output circuit is coupled to the first secondary coil and / or the second secondary coil, and an output terminal of the at least one output circuit is coupled to an external load;

[0012] The feedback terminal is coupled to one of the at least one output circuits through a feedback circuit;

[0013] A voltage stabilizing diode, wherein the anode of the voltage stabilizing diode is grounded, and the cathode of the voltage stabilizing diode is coupled to the feedback end.

[0014] In an embodiment of the first aspect, the input circuit comprises:

[0015] A live wire input terminal, one end of which is coupled to the external AC power source;

[0016] A neutral line input terminal, one end of which is grounded;

[0017] A common-mode suppression inductor, the common-mode suppression inductor comprising a first winding and a second winding, the other end of the live line input end is coupled to one end of the first winding through a fuse, and the other end of the neutral line input end is coupled to one end of the second winding;

[0018] an adjustable resistor, one end of the adjustable resistor being coupled to one end of the first winding, and the other end of the adjustable resistor being coupled to one end of the second winding;

[0019] a second resistor, one end of the second resistor being coupled to one end of the adjustable resistor, and the other end of the second resistor being coupled to the other end of the adjustable resistor via a third resistor;

[0020] A first capacitor, wherein the first capacitor is connected in parallel with the second resistor and the third resistor;

[0021] A second capacitor, one end of the second capacitor is coupled to the other end of the first winding, and the other end of the second capacitor is coupled to the other end of the second winding.

[0022] In an embodiment of the first aspect, the power supply circuit includes:

[0023] a first diode, wherein an anode of the first diode is coupled to the fourth end, and a cathode of the first diode is coupled to the power supply end via a fourth resistor;

[0024] A third capacitor, one end of the third capacitor is coupled to the power supply end, and the other end of the third capacitor is coupled to the third end;

[0025] A first energy storage filter capacitor, wherein a positive electrode of the first energy storage filter capacitor is coupled to the power supply end, and a negative electrode of the first energy storage filter capacitor is coupled to the third end.

[0026] In an embodiment of the first aspect, the power chip further includes an overcurrent detection terminal, and the overcurrent detection terminal is grounded through a fifth resistor and / or a sixth resistor;

[0027] The fifth resistor is connected in parallel with the sixth resistor.

[0028] In an embodiment of the first aspect, the external load comprises a first external load;

[0029] The feedback circuit comprises:

[0030] An optical coupling component, the optical coupling component comprising a transmitter and a receiver, one end of the receiver is coupled to the feedback end, and the other end of the receiver is grounded;

[0031] One end of the transmitter is coupled to the output end of the output circuit through a seventh resistor;

[0032] A three-terminal parallel adjustable regulator, wherein the positive electrode of the three-terminal parallel adjustable regulator is coupled to the other end of the transmitter, the negative electrode of the three-terminal parallel adjustable regulator is grounded, and the reference end of the three-terminal parallel adjustable regulator is coupled to the first external load through an eighth resistor;

[0033] a ninth resistor, one end of the ninth resistor being coupled to the seventh resistor, and the other end of the ninth resistor being coupled to the positive electrode of the three-terminal parallel adjustable regulator;

[0034] a tenth resistor, one end of the tenth resistor being coupled to the positive electrode of the three-terminal parallel adjustable voltage regulator, and the other end of the tenth resistor being coupled to the eighth resistor via a fourth capacitor;

[0035] An eleventh resistor, one end of the eleventh resistor is coupled to the reference end of the three-terminal parallel adjustable regulator, and the other end of the eleventh resistor is grounded.

[0036] In an embodiment of the first aspect, the external load further comprises a second external load;

[0037] The at least one output circuit comprises a first output circuit, an input end of the first output circuit is coupled to the first secondary coil, and an output end of the first output circuit is coupled to the second external load;

[0038] The first output circuit comprises:

[0039] a second diode, wherein an anode of the second diode is coupled to the fifth end, and a cathode of the second diode is coupled to the second external load;

[0040] a second energy storage filter capacitor, wherein a positive electrode of the second energy storage filter capacitor is coupled to a negative electrode of the second diode, and a negative electrode of the second energy storage filter capacitor is grounded;

[0041] a third energy storage filter capacitor, wherein a positive electrode of the third energy storage filter capacitor is coupled to a negative electrode of the second diode, and a negative electrode of the third energy storage filter capacitor is grounded;

[0042] a fifth capacitor, the fifth capacitor being connected in parallel with the third energy storage filter capacitor;

[0043] a twelfth resistor, the twelfth resistor being connected in parallel with the fifth capacitor;

[0044] A thirteenth resistor, one end of the thirteenth resistor is coupled to the anode of the second diode, and the other end of the thirteenth resistor is coupled to the cathode of the second diode through a sixth capacitor.

[0045] In an embodiment of the first aspect, the external load comprises a first external load;

[0046] The at least one output circuit comprises a second output circuit, an input end of the second output circuit is coupled to the second secondary coil, and an output end of the second output circuit is coupled to the first external load;

[0047] The second output circuit comprises:

[0048] a third diode, an anode of the third diode being coupled to the sixth end, and a cathode of the third diode being coupled to the first external load via a second inductor;

[0049] a fourth energy storage filter capacitor, wherein the positive electrode of the fourth energy storage filter capacitor is coupled to the negative electrode of the third diode, and the negative electrode of the fourth energy storage filter capacitor is grounded;

[0050] A seventh capacitor, the seventh capacitor being connected in parallel with the fourth energy storage filter capacitor;

[0051] a fifth energy storage filter capacitor, wherein a positive electrode of the fifth energy storage filter capacitor is coupled to one end of the second inductor, and a negative electrode of the fifth energy storage filter capacitor is grounded;

[0052] an eighth capacitor, the eighth capacitor being connected in parallel with the fifth energy storage filter capacitor;

[0053] a fourteenth resistor, the fourteenth resistor being connected in parallel with the eighth capacitor;

[0054] A fifteenth resistor, one end of the fifteenth resistor is coupled to the sixth end, and the other end of the fifteenth resistor is coupled to the cathode of the third diode through a ninth capacitor.

[0055] In an embodiment of the first aspect, an RCD absorption circuit is further provided between the first end and the power input end, and the RCD absorption circuit comprises:

[0056] a fourth diode, an anode of the fourth diode being coupled to the power input terminal;

[0057] a first resistor group, the first resistor group comprising a plurality of resistors connected in parallel, one end of the first resistor group being coupled to the cathode of the fourth diode, and the other end of the first resistor group being coupled to the first end via a tenth capacitor;

[0058] The second resistor group includes a plurality of resistors connected in parallel, one end of the second resistor group is coupled to the other end of the first resistor group, and the other end of the second resistor group is coupled to the first end.

[0059] In an embodiment of the first aspect, further comprising:

[0060] an eleventh capacitor, one end of the eleventh capacitor being coupled to the first end, and the other end of the eleventh capacitor being coupled to the third end;

[0061] a twelfth capacitor, the twelfth capacitor being connected in parallel with the eleventh capacitor;

[0062] A thirteenth capacitor, one end of the thirteenth capacitor is coupled to the third end, and the other end of the thirteenth capacitor is coupled to the seventh end through a fourteenth capacitor.

[0063] A second aspect of the present disclosure provides a water dispenser, characterized by comprising any one of the above-mentioned voltage-stabilized output power supply circuits.

[0064] Beneficial effects of the present disclosure: Through the tap design of the secondary coil of the transformer, one secondary coil can be connected to multiple output circuits that do not need to be isolated, directly providing multiple different voltages or currents, meeting the system's multi-point power supply requirements, and reducing dependence on external converters. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 A circuit schematic diagram showing a voltage-stabilized output power supply circuit in an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0066] The following is an explanation of the embodiments of the present disclosure by specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the information disclosed by the present disclosure. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in the present disclosure can also be modified or changed in various ways according to different viewpoints and application modules without departing from the spirit of the present disclosure. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0067] The following is a detailed description of the embodiments of the present disclosure with reference to the accompanying drawings so that those skilled in the art can easily implement the present disclosure. The present disclosure can be embodied in many different forms and is not limited to the embodiments described herein.

[0068] In the representations of the present disclosure, the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. Moreover, the specific features, structures, materials or characteristics represented may be combined in any one or a group of embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples represented in the present disclosure and the features of different embodiments or examples, unless they are mutually contradictory.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of the present disclosure, "a group" means two or more, unless otherwise clearly and specifically defined.

[0070] In order to clearly describe the present disclosure, components not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

[0071] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0072] Although the terms first, second, etc. are used to represent various elements in this article in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate that there are the described features, steps, operations, elements, modules, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or a group of other features, steps, operations, elements, modules, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0073] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present disclosure. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0074] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which the present disclosure belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with relevant technical literature and the message of the present disclosure, and shall not be overly interpreted as ideal or very formal meanings unless defined.

[0075] In related technologies, voltage-regulated power supply designs are often limited to a single output or can provide a stable voltage, but when faced with multiple voltage requirements, additional converters or separate power supply modules are required, which increases the complexity, cost and volume of the system, reduces efficiency, and may introduce unnecessary electromagnetic interference problems.

[0076] The first aspect of the present disclosure provides a voltage-stabilized output power supply circuit, wherein Figure 1 In the embodiment, it includes: an input circuit, a transformer T1, a power chip and at least one output circuit.

[0077] The input end of the input circuit is coupled to an external AC power source, and the output end of the input circuit outputs a DC power source after being rectified by a rectifier bridge.

[0078] The transformer T1 includes a primary coil, an auxiliary coil and a secondary coil.

[0079] The primary coil includes a first end 1 and a second end 2. The auxiliary coil includes a third end 3 and a fourth end 4; the secondary coil includes a fifth end 5, a sixth end 6 and a seventh end 7. The secondary coil tap forms the sixth end 6; the sixth end 6 and the fifth end 5 form a first secondary coil, and the sixth end 6 and the seventh end 7 form a second secondary coil.

[0080] The output end of the rectifier bridge is coupled to the first end 1 via a first resistor R1 and a first inductor L1 .

[0081] The power chip includes a power input terminal SW, a power supply terminal VDD and a feedback terminal FB.

[0082] The power input terminal SW is coupled to the second terminal 2 ; the power supply terminal VDD is coupled to the fourth terminal 4 via a power supply circuit.

[0083] An input terminal of the at least one output circuit is coupled to the first secondary coil and / or the second secondary coil, and an output terminal of the at least one output circuit is coupled to an external load.

[0084] The feedback terminal FB is coupled to one of the at least one output circuit through a feedback circuit.

[0085] A voltage stabilizing diode DW1 , wherein an anode of the voltage stabilizing diode DW1 is grounded, and a cathode of the voltage stabilizing diode DW1 is coupled to the feedback terminal FB.

[0086] Specifically, in some embodiments, the input end of the input circuit is coupled to external alternating current, which provides a direct current power supply for subsequent circuits after passing through a rectifier bridge.

[0087] Transformer T1 includes a primary coil, an auxiliary coil and a secondary coil, wherein the secondary coil is designed with a tap, which is cleverly separated to form two independent output ends (a first secondary coil and a second secondary coil), that is, the sixth end 6 and the fifth end 5 constitute the first secondary coil, and the sixth end 6 and the seventh end 7 constitute the second secondary coil, thereby realizing multi-channel output.

[0088] The power chip includes a power input terminal SW and a feedback terminal FB, the input terminal is coupled to the second terminal 2 of the transformer T1, and the power supply terminal VDD is connected to the fourth terminal 4 through the power supply circuit to achieve high efficiency control.

[0089] At least one output circuit, each input end can be flexibly configured to connect to the first secondary ring or the second secondary ring to meet different load requirements, and the output end can be connected to an external load to achieve multi-channel output. Figure 1In an embodiment, at least one output circuit includes a first output circuit and a second output circuit; at least one output circuit may also be one output circuit or more than two output circuits, and the number of output circuits is set according to actual usage.

[0090] The feedback terminal FB of the power chip is connected to at least one output terminal through a feedback circuit to form a closed-loop control. The output voltage is adjusted in real time by adjusting the on and off of the primary coil to ensure voltage regulation. The voltage regulator diode DW1 is used to clamp the voltage of the feedback terminal FB. When the voltage of the feedback circuit rises and exceeds the breakdown voltage of the voltage regulator diode DW1, the voltage regulator diode DW1 is reversely broken down to clamp the feedback voltage of the feedback terminal FB to the breakdown voltage, thereby protecting the FB terminal.

[0091] Optional, in Figure 1 In the embodiment, the input circuit includes: a live line input terminal L, a neutral line input terminal N, a common mode suppression inductor T2, an adjustable resistor RV1, a second resistor R2, a first capacitor C1 and a second capacitor C2.

[0092] One end of the live wire input terminal L is coupled to the external AC power source.

[0093] One end of the neutral line input terminal N is grounded.

[0094] The common mode suppression inductor T2 includes a first winding T21 and a second winding T22 . The other end of the live line input terminal L is coupled to one end of the first winding T21 through a fuse F1 . The other end of the neutral line input terminal N is coupled to one end of the second winding T22 .

[0095] One end of the adjustable resistor RV1 is coupled to one end of the first winding T21 , and the other end of the adjustable resistor RV1 is coupled to one end of the second winding T22 .

[0096] One end of the second resistor R2 is coupled to one end of the adjustable resistor RV1 , and the other end of the second resistor R2 is coupled to the other end of the adjustable resistor RV1 via a third resistor R3 .

[0097] The first capacitor C1 is connected in parallel with the second resistor R2 and the third resistor R3.

[0098] One end of the second capacitor C2 is coupled to the other end of the first winding T21 , and the other end of the second capacitor C2 is coupled to the other end of the second winding T22 .

[0099] Specifically, in some embodiments, one end of the live input terminal L is coupled to an external AC power source, and one end of the neutral input terminal N is grounded to ensure power access and basic safety. The common mode inductor adopts a dual winding design (a first winding T21 and a second winding T22), and the other end of the live input terminal L is connected to one end of the first winding T21 through a fuse F1, and the neutral terminal is connected to one end of the second winding T22, forming a common mode suppression, which effectively suppresses the grid noise.

[0100] One end of the adjustable resistor RV1 is connected to one end of the first winding T21, and the other end is connected to one end of the second winding T22, so as to adjust the input current and enhance the adaptability to different load requirements. One end of the second resistor R2 is connected to one end of the adjustable resistor RV1, and the other end is connected to the other end of the adjustable resistor RV1 through the third resistor R3, so as to form a current adjustment and voltage divider network. The first capacitor C1 is connected in parallel with the second resistor R2 and the third resistor R3 to form a filter circuit, so as to enhance high-frequency noise suppression and improve the purity of the power supply. One end of the second capacitor C2 is coupled to the other end of the first winding T21, and the other end is connected to the other end of the second winding T22, so as to form a closure of the filter circuit with the inductor and improve the quality of the input signal.

[0101] Optional, in Figure 1 In the embodiment, the power supply circuit includes: a first diode D1, a third capacitor C3 and a first energy storage filter capacitor EC1.

[0102] An anode of the first diode D1 is coupled to the fourth terminal 4 , and a cathode of the first diode D1 is coupled to the power supply terminal VDD via a fourth resistor R4 .

[0103] One end of the third capacitor C3 is coupled to the power supply terminal VDD, and the other end of the third capacitor C3 is coupled to the third terminal 3 .

[0104] The positive electrode of the first energy storage filter capacitor EC1 is coupled to the power supply terminal VDD, and the negative electrode of the first energy storage filter capacitor EC1 is coupled to the third terminal 3 .

[0105] Specifically, in some embodiments, the positive electrode of the first diode D1 is coupled to the fourth terminal 4 of the transformer T1, and the negative electrode is connected to the power supply terminal VDD through the fourth resistor R4 to achieve controllable conduction, ensure the forward conduction directionality of the power supply, and provide protection in the event of an abnormality. One end of the third capacitor C3 is coupled to the power supply terminal VDD, and the other end is connected to the third terminal 3 of the transformer T1, which is used to filter out high-frequency clutter and enhance the quality of the power supply.

[0106] The positive electrode of the first energy storage filter capacitor EC1 is coupled to the power supply terminal VDD, and the negative electrode is connected to the third terminal 3. The first energy storage filter capacitor EC1 takes a point from the auxiliary coil to store energy; the first energy storage filter capacitor EC1 is used to absorb and release energy, effectively filter out power supply ripple, and maintain voltage stability.

[0107] Optional, in Figure 1 In an embodiment, the power chip further includes an overcurrent detection terminal, and the overcurrent detection terminal is grounded through a fifth resistor R5 and / or a sixth resistor R6;

[0108] The fifth resistor R5 and the sixth resistor R6 are connected in parallel.

[0109] Specifically, in some embodiments, when current flows through the fifth resistor R5, a voltage drop is generated, and a voltage drop signal is generated. The voltage drop is proportional to the current flowing through. The sixth resistor R6 also produces a voltage drop in the same way, but it is mainly a shunt effect. The overcurrent detection end is grounded through the fifth resistor R5 and the sixth resistor R6, and the voltage drop signal is reflected to the overcurrent state of the overcurrent detection end. The internal comparator or control logic of the chip will compare the voltage drop signal with the preset threshold value, and once it exceeds, the protection mechanism is triggered. After the overcurrent is triggered, the power chip can take a variety of actions, such as cutting off the output, reducing the output current, warning or starting the external protection relay, etc., to ensure system safety.

[0110] Optionally, the external load includes a first external load f0;

[0111] An input terminal of the second output circuit is coupled to the second secondary coil, and an output terminal of the second output circuit is coupled to the first external load f0;

[0112] exist Figure 1 In an embodiment, the second output circuit comprises:

[0113] a third diode D3, wherein an anode of the third diode D3 is coupled to the sixth terminal 6, and a cathode of the third diode D3 is coupled to the first external load f0 via a second inductor L2;

[0114] a fourth energy storage filter capacitor EC4, wherein the positive electrode of the fourth energy storage filter capacitor EC4 is coupled to the negative electrode of the third diode D3, and the negative electrode of the fourth energy storage filter capacitor EC4 is grounded;

[0115] A seventh capacitor C7, wherein the seventh capacitor C7 is connected in parallel with the fourth energy storage filter capacitor EC4;

[0116] a fifth energy storage filter capacitor EC5, wherein a positive electrode of the fifth energy storage filter capacitor EC5 is coupled to one end of the second inductor L2, and a negative electrode of the fifth energy storage filter capacitor EC5 is grounded;

[0117] An eighth capacitor C8, wherein the eighth capacitor C8 is connected in parallel with the fifth energy storage filter capacitor EC5;

[0118] a fourteenth resistor R14, the fourteenth resistor R14 being connected in parallel with the eighth capacitor C8;

[0119] A fifteenth resistor R15 , one end of the fifteenth resistor R15 is coupled to the sixth end 6 , and the other end of the fifteenth resistor R15 is coupled to the cathode of the third diode D3 via a ninth capacitor C9 .

[0120] Specifically, in some embodiments, the positive electrode of the fourth energy storage filter capacitor EC4 is coupled to the negative electrode of the third diode D3, and the negative electrode is grounded and connected in parallel with the seventh capacitor C7 to improve the filtering performance. The positive electrode of the fifth energy storage filter capacitor EC5 is coupled to the second inductor L2, the negative electrode is grounded, and connected in parallel with the eighth capacitor C8 to enhance current smoothing and stability. The fourteenth resistor R14 is connected in parallel with the eighth capacitor C8 to optimize the filtering response; the fifteenth resistor R15 is connected to the sixth terminal 6 on one side and to the negative electrode of the third tube through the ninth capacitor C9 on the other side to achieve current feedback control.

[0121] Optional, in Figure 1 In an embodiment, the feedback circuit comprises:

[0122] An optical coupling component O, wherein the optical coupling component O comprises a transmitter O2 and a receiver O1, wherein one end of the receiver O1 is coupled to the feedback end FB, and the other end of the receiver O1 is grounded;

[0123] One end of the transmitter O2 is coupled to an output end of one of the output circuits of the at least one output circuit through a seventh resistor R7;

[0124] A three-terminal parallel adjustable voltage regulator U1, wherein a positive electrode of the three-terminal parallel adjustable voltage regulator U1 is coupled to the other end of the transmitter O2, a negative electrode of the three-terminal parallel adjustable voltage regulator U1 is grounded, and a reference end of the three-terminal parallel adjustable voltage regulator U1 is coupled to the first external load f0 through an eighth resistor R8;

[0125] a ninth resistor R9, one end of the ninth resistor R9 is coupled to the seventh resistor R7, and the other end of the ninth resistor R9 is coupled to the positive electrode of the three-terminal parallel adjustable regulator U1;

[0126] a tenth resistor R10, one end of the tenth resistor R10 is coupled to the positive electrode of the three-terminal parallel adjustable regulator U1, and the other end of the tenth resistor R10 is coupled to the eighth resistor R8 via a fourth capacitor C4;

[0127] An eleventh resistor R11 , one end of the eleventh resistor R11 is coupled to the reference end of the three-terminal parallel adjustable regulator U1 , and the other end of the eleventh resistor R11 is grounded.

[0128] Specifically, in some embodiments, the feedback circuit is coupled between the input terminal and the output terminal of the second output circuit.

[0129] In some embodiments, the optical coupler component O includes a transmitter O2 and a receiver O1, wherein one end of the receiver O1 is connected to the feedback end FB, and the other end is grounded. The transmitter O2 is connected to the output end through the seventh resistor R7. When there is a current change, the transmitter O2 converts these changes into optical signals; the receiver O1 captures the optical signal emitted by the transmitter O2, converts it back into an electrical signal, and sends it to the circuit through the feedback end FB. This signal reflects the output voltage state.

[0130] The positive electrode of the three-terminal parallel adjustable voltage regulator U1 is connected to the output terminal of the transmitter O2, the negative electrode is grounded, and the reference terminal is connected to the external load through the eighth resistor R8. When the output voltage decreases, the voltage divided by the eighth resistor R8 and the eleventh resistor R11 at the input reference terminal decreases, resulting in an increase in the voltage drop across the three-terminal parallel adjustable voltage regulator U1, that is, the voltage at one end connected to the ninth resistor R9 increases, while the voltage at the upper end of the seventh resistor R7 decreases, so that the current transmitted through the transmitter O2 is also reduced, and the emitted light signal is weakened, then the voltage of the feedback signal input to FB obtained by the receiver O1 according to the light signal decreases, triggering the power chip to adjust the duty cycle of the primary coil to increase the output voltage.

[0131] Furthermore, the eighth resistor R8 and the eleventh resistor R11 sample the voltage value of the output terminal. When the output voltage increases, the voltage division of the reference terminal increases. At this time, the voltage drop between the positive and negative electrodes of the three-terminal parallel adjustable regulator U1 decreases, thereby causing the current of the transmitter to increase, so that the FB terminal receives a feedback signal of increased voltage.

[0132] The tenth resistor R10 and the fourth capacitor C4 form an RC filter circuit.

[0133] Optionally, the external load includes a second external load f1;

[0134] An input end of the first output circuit is coupled to the first secondary coil, and an output end of the first output circuit is coupled to the second external load f1;

[0135] exist Figure 1 In an embodiment, the first output circuit comprises:

[0136] a second diode D2, wherein an anode of the second diode D2 is coupled to the fifth end 5, and a cathode of the second diode D2 is coupled to the second external load f1;

[0137] a second energy storage filter capacitor EC2, wherein the positive electrode of the second energy storage filter capacitor EC2 is coupled to the negative electrode of the second diode D2, and the negative electrode of the second energy storage filter capacitor EC2 is grounded;

[0138] a third energy storage filter capacitor EC3, wherein the positive electrode of the third energy storage filter capacitor EC3 is coupled to the negative electrode of the second diode D2, and the negative electrode of the third energy storage filter capacitor EC3 is grounded;

[0139] A fifth capacitor C5, wherein the fifth capacitor C5 is connected in parallel with the third energy storage filter capacitor EC3;

[0140] a twelfth resistor R12, wherein the twelfth resistor R12 is connected in parallel with the fifth capacitor C5;

[0141] A thirteenth resistor R13 , one end of the thirteenth resistor R13 is coupled to the anode of the second diode D2 , and the other end of the thirteenth resistor R13 is coupled to the cathode of the second diode D2 via a sixth capacitor C6 .

[0142] Specifically, in some embodiments, the feedback circuit may also be coupled between the input terminal and the output terminal of the first output circuit.

[0143] In some embodiments, the second energy storage filter capacitor EC2 and the third energy storage filter capacitor are used together for high-frequency filtering protection to keep the output pure. The fifth capacitor C5 is connected in parallel with the third energy storage filter capacitor EC3 to further enhance the filtering performance and improve the output quality. The twelfth resistor R12 is connected in parallel with the fifth capacitor C5 to optimize the control filtering response. The thirteenth resistor R13 and the sixth capacitor C6 are used for filtering.

[0144] Optionally, an RCD absorption circuit is further provided between the first terminal 1 and the power input terminal SW. Figure 1 In an embodiment, the RCD absorption circuit comprises:

[0145] a fourth diode D4, wherein an anode of the fourth diode D4 is coupled to the power input terminal SW;

[0146] A first resistor group R16, the first resistor group R16 includes a plurality of resistors connected in parallel, one end of the first resistor group R16 is coupled to the cathode of the fourth diode D4, and the other end of the first resistor group R16 is coupled to the first end 1 through a tenth capacitor C10;

[0147] The second resistor group R17 includes a plurality of resistors connected in parallel, one end of the second resistor group R17 is coupled to the other end of the first resistor group R16, and the other end of the second resistor group R17 is coupled to the first end 1.

[0148] Specifically, in some embodiments, a plurality of resistors are connected in parallel to form a first resistor group R16, one end of the first resistor group R16 is connected to the cathode of the fourth diode D4, and the other end is coupled back to the first end 1 through the tenth capacitor C10, forming a high-frequency noise absorption and filtering path. The second resistor group R17 also uses a parallel resistor connection method, one end is coupled to the other end of the first resistor group R16, and the other end is connected back to the first end 1, deepening the filtering and current distribution, and improving stability. The RCD absorption circuit effectively constructs a protection and filtering system at the power input terminal SW through the fourth diode D4, the well-designed resistor group parallel resistor and capacitor, and greatly enhances the electromagnetic compatibility of the circuit.

[0149] Optional, in Figure 1 In the embodiment, it also includes:

[0150] an eleventh capacitor C11, one end of the eleventh capacitor C11 is coupled to the first end 1, and the other end of the eleventh capacitor C11 is coupled to the third end 3;

[0151] a twelfth capacitor C12, wherein the twelfth capacitor C12 is connected in parallel with the eleventh capacitor C11;

[0152] A thirteenth capacitor C13, one end of the thirteenth capacitor C13 is coupled to the third end 3, and the other end of the thirteenth capacitor C13 is coupled to the seventh end 7 through a fourteenth capacitor C14.

[0153] Specifically, in some embodiments, one end of the eleventh capacitor C11 is coupled to the first terminal 1 of the transformer T1, and the other end is connected to the third terminal 3, forming a basic filtering path to eliminate clutter ripples. The twelfth capacitor C12 is connected in parallel with the eleventh capacitor C11, and they work together to enhance the filtering effect, improve the suppression of high-frequency noise, and ensure the cleanliness of the signal. One end of the thirteenth capacitor C13 is connected to the third terminal 3, and is coupled back to the seventh terminal 7 through the fourteenth capacitor C14 to form a loop for filtering in the mid-frequency band to ensure the continuity and stability of the output signal.

[0154] Optional, in Figure 1 In the embodiment, it also includes: a fifteenth capacitor C15, a sixteenth capacitor C16, a sixth energy storage filter capacitor EC6, a seventh energy storage filter capacitor EC7 and a magnetic bead string U2.

[0155] One end of the fifteenth capacitor C15 is coupled to the feedback end FB, and the other end of the fifteenth capacitor C15 is grounded; the sixteenth capacitor C16 is connected in parallel with the fifteenth capacitor C15.

[0156] The positive electrode of the sixth energy storage filter capacitor EC6 is coupled to one end of the first inductor L1, and the negative electrode of the sixth energy storage filter capacitor EC6 is grounded; the positive electrode of the seventh energy storage filter capacitor EC7 is coupled to the other end of the first inductor L1, and the negative electrode of the seventh energy storage filter capacitor EC7 is grounded;

[0157] One end of the magnetic bead string U2 is coupled to the ground terminal of the power chip, and the other end of the magnetic bead string U2 is coupled to the output ground terminal. The magnetic bead string U2 is used to reduce conducted radiation and is an optional configuration.

[0158] Specifically, one end of the fifteenth capacitor C15 is connected to the feedback end FB, and the other end is grounded. The sixteenth capacitor C16 is connected in parallel to enhance feedback filtering and improve the purity and stability of the feedback signal.

[0159] For the first inductor L1, the sixth energy storage filter capacitor EC6 has its positive electrode connected to one end and its negative electrode grounded, and the seventh energy storage filter capacitor EC7 has its positive electrode connected to the other end and its negative electrode grounded. The two cooperate with the first inductor L1 to filter out the AC component in the transmission current to pass a stable DC current.

[0160] A second aspect of the present disclosure provides a water dispenser, characterized in that it includes the voltage-stabilized output power supply circuit described in any of the above embodiments.

[0161] The above embodiments are merely illustrative of the principles and effects of the present disclosure, and are not intended to limit the present disclosure. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present disclosure. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present disclosure shall still be covered by the protection scope of the present disclosure.

Claims

1. A voltage-stabilized output power supply circuit, characterized in that: include: An input circuit, wherein the input end of the input circuit is coupled to an external AC power source, and the output end of the input circuit outputs a DC power source after being rectified by a rectifier bridge; transformer , the transformer includes a primary coil, an auxiliary coil and a secondary coil; The primary coil includes a first end and a second end; the auxiliary coil includes a third end and a fourth end; the secondary coil includes a fifth end, a sixth end and a seventh end; the secondary coil tap forms the sixth end; The sixth end and the fifth end form a first secondary coil, and the sixth end and the seventh end form a second secondary coil; The output end of the rectifier bridge is coupled to the first end via a first resistor and a first inductor; A power chip, the power chip comprising a power input terminal, a power supply terminal and a feedback terminal; The power input terminal is coupled to the second terminal; the power supply terminal is coupled to the fourth terminal via a power supply circuit; at least one output circuit, wherein an input terminal of the at least one output circuit is coupled to the first secondary coil and / or the second secondary coil, and an output terminal of the at least one output circuit is coupled to an external load; The feedback terminal is coupled to one of the at least one output circuits through a feedback circuit; A voltage stabilizing diode, wherein the anode of the voltage stabilizing diode is grounded, and the cathode of the voltage stabilizing diode is coupled to the feedback end.

2. The voltage-stabilized output power supply circuit according to claim 1, characterized in that: The input circuit comprises: A live wire input terminal, one end of which is coupled to the external AC power source; A zero line input terminal, one end of which is grounded; A common-mode suppression inductor, the common-mode suppression inductor comprising a first winding and a second winding, the other end of the live line input end is coupled to one end of the first winding through a fuse, and the other end of the neutral line input end is coupled to one end of the second winding; an adjustable resistor, one end of the adjustable resistor being coupled to one end of the first winding, and the other end of the adjustable resistor being coupled to one end of the second winding; a second resistor, one end of the second resistor being coupled to one end of the adjustable resistor, and the other end of the second resistor being coupled to the other end of the adjustable resistor via a third resistor; A first capacitor, wherein the first capacitor is connected in parallel with the second resistor and the third resistor; A second capacitor, one end of the second capacitor is coupled to the other end of the first winding, and the other end of the second capacitor is coupled to the other end of the second winding.

3. The voltage-stabilized output power supply circuit according to claim 1, characterized in that: The power supply circuit comprises: a first diode, wherein an anode of the first diode is coupled to the fourth end, and a cathode of the first diode is coupled to the power supply end via a fourth resistor; A third capacitor, one end of the third capacitor is coupled to the power supply end, and the other end of the third capacitor is coupled to the third end; A first energy storage filter capacitor, wherein a positive electrode of the first energy storage filter capacitor is coupled to the power supply end, and a negative electrode of the first energy storage filter capacitor is coupled to the third end.

4. The voltage-stabilized output power supply circuit according to claim 1, characterized in that: The power chip further includes an overcurrent detection terminal, which is grounded via a fifth resistor and / or a sixth resistor; The fifth resistor is connected in parallel with the sixth resistor.

5. The voltage-stabilized output power supply circuit according to claim 1, characterized in that: The external load comprises a first external load; The feedback circuit comprises: An optical coupling component, the optical coupling component comprising a transmitter and a receiver, one end of the receiver is coupled to the feedback end, and the other end of the receiver is grounded; One end of the transmitter is coupled to the output end of the output circuit through a seventh resistor; A three-terminal parallel adjustable regulator, wherein the positive electrode of the three-terminal parallel adjustable regulator is coupled to the other end of the transmitter, the negative electrode of the three-terminal parallel adjustable regulator is grounded, and the reference end of the three-terminal parallel adjustable regulator is coupled to the first external load through an eighth resistor; a ninth resistor, one end of the ninth resistor being coupled to the seventh resistor, and the other end of the ninth resistor being coupled to the positive electrode of the three-terminal parallel adjustable regulator; a tenth resistor, one end of the tenth resistor being coupled to the positive electrode of the three-terminal parallel adjustable voltage regulator, and the other end of the tenth resistor being coupled to the eighth resistor via a fourth capacitor; An eleventh resistor, one end of the eleventh resistor is coupled to the reference end of the three-terminal parallel adjustable regulator, and the other end of the eleventh resistor is grounded.

6. The voltage-stabilized output power supply circuit according to claim 1, characterized in that: The external load further includes a second external load; The at least one output circuit comprises a first output circuit, an input end of the first output circuit is coupled to the first secondary coil, and an output end of the first output circuit is coupled to the second external load; The first output circuit comprises: a second diode, wherein an anode of the second diode is coupled to the fifth end, and a cathode of the second diode is coupled to the second external load; a second energy storage filter capacitor, wherein a positive electrode of the second energy storage filter capacitor is coupled to a negative electrode of the second diode, and a negative electrode of the second energy storage filter capacitor is grounded; a third energy storage filter capacitor, wherein a positive electrode of the third energy storage filter capacitor is coupled to a negative electrode of the second diode, and a negative electrode of the third energy storage filter capacitor is grounded; a fifth capacitor, the fifth capacitor being connected in parallel with the third energy storage filter capacitor; a twelfth resistor, the twelfth resistor being connected in parallel with the fifth capacitor; A thirteenth resistor, one end of the thirteenth resistor is coupled to the anode of the second diode, and the other end of the thirteenth resistor is coupled to the cathode of the second diode through a sixth capacitor.

7. The voltage-stabilized output power supply circuit according to claim 1, characterized in that: The external load comprises a first external load; The at least one output circuit comprises a second output circuit, an input end of the second output circuit is coupled to the second secondary coil, and an output end of the second output circuit is coupled to the first external load; The second output circuit comprises: a third diode, an anode of the third diode being coupled to the sixth end, and a cathode of the third diode being coupled to the first external load via a second inductor; a fourth energy storage filter capacitor, wherein the positive electrode of the fourth energy storage filter capacitor is coupled to the negative electrode of the third diode, and the negative electrode of the fourth energy storage filter capacitor is grounded; A seventh capacitor, the seventh capacitor being connected in parallel with the fourth energy storage filter capacitor; a fifth energy storage filter capacitor, wherein a positive electrode of the fifth energy storage filter capacitor is coupled to one end of the second inductor, and a negative electrode of the fifth energy storage filter capacitor is grounded; an eighth capacitor, the eighth capacitor being connected in parallel with the fifth energy storage filter capacitor; a fourteenth resistor, the fourteenth resistor being connected in parallel with the eighth capacitor; A fifteenth resistor, one end of the fifteenth resistor is coupled to the sixth end, and the other end of the fifteenth resistor is coupled to the cathode of the third diode through a ninth capacitor.

8. The voltage-stabilized output power supply circuit according to claim 1, characterized in that: An RCD absorption circuit is also provided between the first end and the power input end, and the RCD absorption circuit comprises: a fourth diode, wherein an anode of the fourth diode is coupled to the power input terminal; a first resistor group, the first resistor group comprising a plurality of resistors connected in parallel, one end of the first resistor group being coupled to the cathode of the fourth diode, and the other end of the first resistor group being coupled to the first end via a tenth capacitor; The second resistor group includes a plurality of resistors connected in parallel, one end of the second resistor group is coupled to the other end of the first resistor group, and the other end of the second resistor group is coupled to the first end.

9. The voltage-stabilized output power supply circuit according to claim 1, characterized in that: Also includes: an eleventh capacitor, one end of the eleventh capacitor being coupled to the first end, and the other end of the eleventh capacitor being coupled to the third end; a twelfth capacitor, the twelfth capacitor being connected in parallel with the eleventh capacitor; A thirteenth capacitor, one end of the thirteenth capacitor is coupled to the third end, and the other end of the thirteenth capacitor is coupled to the seventh end through a fourteenth capacitor.

10. A water dispenser, characterized in that: It comprises a voltage-stabilized output power supply circuit as described in any one of claims 1 to 9.

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