Charger power supply circuit and scrubber charger

Abstract

The embodiment of the utility model provides a charger power supply circuit and a scrubber charger. An output end of an input circuit is coupled to a first end of a primary side coil through a first rectifier bridge and a second rectifier bridge; a plurality of power supply input ends of the power supply chip are coupled with the second end; the power supply end is coupled with the third end; the feedback end is coupled with the feedback chip; the input end of the output circuit is coupled with the secondary coil, and the output end is coupled with an external load; the feedback chip generates a feedback signal through the optocoupler assembly according to the output voltage of the output circuit, and feeds back the feedback signal to the feedback end; and the power supply chip adjusts the on-off of the primary side coil according to the feedback signal so as to realize the adjustment of the output voltage of the output circuit. One end of the first capacitor is coupled with the first end, and the other end of the first capacitor is grounded; one end of the third capacitor is coupled to the fourth end, and the other end of the third capacitor is grounded. According to the invention, high-frequency radiation is effectively suppressed through the arrangement of the plurality of capacitors and the transformer, and good electromagnetic environment compatibility can be maintained in a high-frequency working state.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power supply circuits, and in particular to a charger power supply circuit and a floor scrubber charger. Background Art

[0002] In today's society, with the popularization of electronic devices and the rapid development of technology, efficient, stable and adaptable charging solutions have become an important demand in the field of power electronics. The relevant power supply circuits are limited by materials and designs, and it is often difficult to achieve high energy efficiency standards while ensuring cost-effectiveness. In particular, when pursuing a conversion efficiency of more than 90%, the technical difficulty increases significantly. With the development of high-frequency technology, the problem of electromagnetic radiation in the high-frequency state has also intensified, causing interference to surrounding electronic equipment, and it is difficult to meet strict EMI specifications. In the process of increasing the switching frequency to enhance performance, the stability and reliability of the system have become a major challenge, including how to effectively deal with voltage spikes and current mutations caused by high-frequency switching, and how to maintain the stable working state of the circuit for a long time. In order to overcome the above problems, the solutions of related technologies often lead to increased complexity of circuit design, which not only prolongs the R&D cycle, but also increases production costs due to additional filtering components and complex control strategies. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the related art, the purpose of the present invention is to provide a charger power supply circuit and a floor scrubber charger to solve the problems in the related art.

[0004] A first aspect of the present disclosure provides a charger power supply circuit, comprising:

[0005] An input circuit, an input terminal of the input circuit being coupled to an external power source;

[0006] A transformer, the transformer comprising a primary coil, an auxiliary coil and a secondary coil; the primary coil comprises a first end and a second end; the auxiliary coil comprises a third end and a fourth end;

[0007] The output end of the input circuit is coupled to the first end through a first rectifier bridge and a second rectifier bridge;

[0008] A power chip, the power chip comprising a plurality of power input terminals, a power supply terminal and a feedback terminal; the plurality of power input terminals are all coupled to the second terminal; the power supply terminal is coupled to the third terminal via a power supply circuit; the feedback terminal is coupled to a feedback chip via an optical coupling component;

[0009] an output circuit, wherein an input end of the output circuit is coupled to the secondary coil, and an output end of the output circuit is coupled to an external load;

[0010] The feedback chip is coupled between the input terminal and the output terminal of the output circuit;

[0011] The feedback chip generates a feedback signal through the optical coupling component according to the output voltage of the output circuit, and feeds the feedback signal back to the feedback terminal;

[0012] The power chip adjusts the on / off of the primary coil according to the feedback signal to adjust the output voltage of the output circuit;

[0013] A first capacitor, one end of the first capacitor is coupled to the first end, and the other end of the first capacitor is grounded through a second capacitor;

[0014] A third capacitor, one end of the third capacitor is coupled to the fourth end, and the other end of the third capacitor is grounded through the fourth capacitor.

[0015] Optionally, the input circuit includes:

[0016] A live wire input terminal, one end of which is coupled to an external AC power source;

[0017] A neutral line input terminal, one end of which is grounded;

[0018] A first common-mode suppression inductor, wherein the first common-mode suppression inductor includes a first winding and a second winding;

[0019] The other end of the live wire input end is coupled to one end of the first winding through a fuse, and the other end of the first winding is connected to the first end through the first rectifier bridge;

[0020] The other end of the neutral line input end is coupled to one end of the second winding, and the other end of the second winding is coupled to the first end through the second rectifier bridge; an output end of the first rectifier bridge is coupled to an input end of the second rectifier bridge;

[0021] The output ends of the first rectifier bridge and the second rectifier bridge are coupled to the first end through a first inductor;

[0022] an adjustable resistor, one end of the adjustable resistor being coupled to the first end, and the other end of the adjustable resistor being coupled to the third end;

[0023] The fifth capacitor is coupled between the adjustable resistor and the first common-mode suppression inductor and is connected in parallel with the adjustable resistor.

[0024] Optionally, the power supply circuit includes:

[0025] a first diode, wherein an anode of the first diode is coupled to the third end via a first resistor, and a cathode of the first diode is coupled to the power supply end;

[0026] a first energy storage filter capacitor, wherein a positive electrode of the first energy storage filter capacitor is coupled to a negative electrode of the first diode, and a negative electrode of the first energy storage filter capacitor is grounded;

[0027] A sixth capacitor is connected in parallel with the first energy storage filter capacitor.

[0028] Optionally, the optical coupling component includes 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;

[0029] The output end of the output circuit includes a positive output end and a negative output end;

[0030] One end of the transmitter is coupled to a secondary output end between an input end and an output end of the output circuit through a second resistor;

[0031] The feedback chip comprises: a feedback chip power supply terminal, an output voltage feedback terminal, an output current feedback terminal, a reference terminal, a feedback chip ground terminal and a feedback chip output terminal;

[0032] The feedback chip power supply terminal is coupled to the positive output terminal of the output circuit through a third resistor; the output voltage feedback terminal is coupled to a voltage feedback circuit; the output current feedback terminal is coupled to the negative output terminal through a fourth resistor; the reference terminal is grounded; the feedback chip ground terminal is grounded; the output terminal of the feedback chip is coupled to the other terminal of the transmitter;

[0033] The fifth resistor is coupled between two ends of the transmitter.

[0034] Optionally, the voltage feedback circuit includes:

[0035] a sixth resistor, one end of the sixth resistor being coupled to the positive output terminal, and the other end of the sixth resistor being grounded via a seventh resistor; and a connection point between the sixth resistor and the seventh resistor being coupled to the output voltage feedback terminal;

[0036] An eighth resistor is connected in parallel with the seventh resistor.

[0037] Optionally, also include:

[0038] a seventh capacitor, one end of the seventh capacitor being coupled to one end of the fourth resistor, and the other end of the seventh capacitor being coupled to the fifth resistor via a ninth resistor;

[0039] an eighth capacitor, coupled between the feedback chip power supply terminal and the reference terminal;

[0040] a ninth capacitor, one end of the ninth capacitor being coupled to the output voltage feedback end, and the other end of the ninth capacitor being coupled to the ninth resistor via a tenth resistor;

[0041] The feedback chip output terminal is coupled to a connection point between the ninth resistor and the tenth resistor.

[0042] Optionally, the power chip further includes: an overcurrent detection terminal, an overvoltage detection terminal, an operating frequency setting terminal and a power chip ground terminal;

[0043] The overcurrent detection terminal is grounded through a first resistor group;

[0044] The overvoltage detection terminal is coupled to the fourth terminal through an overvoltage detection circuit;

[0045] The overvoltage detection circuit comprises: an eleventh resistor, a twelfth resistor and a tenth capacitor;

[0046] One end of the eleventh resistor is coupled to the third end, and the other end of the eleventh resistor is grounded through the twelfth resistor; the overvoltage detection end is coupled to a connection point between the eleventh resistor and the twelfth resistor; the tenth capacitor is connected in parallel with the twelfth resistor;

[0047] The operating frequency setting terminal is grounded via a thirteenth resistor;

[0048] The grounding terminal of the power chip is grounded;

[0049] The eleventh capacitor is coupled between the feedback terminal and the ground terminal of the power chip.

[0050] Optionally, the secondary coil includes a fifth end and a sixth end; the output end of the output circuit includes a positive output end and a negative output end;

[0051] Then the output circuit comprises:

[0052] A switch chip, wherein the input end of the switch chip is coupled to the fifth end, and the output end of the switch chip is coupled to the positive output end via a second inductor;

[0053] The connection point between the output end of the switch chip and the second inductor forms a secondary output end between the input end and the output end of the output circuit;

[0054] The second common mode suppression inductor comprises a third winding and a fourth winding; one end of the third winding is coupled to the second inductor, and the other end of the third winding is coupled to the positive output end; one end of the fourth winding is coupled to the negative output end;

[0055] a fourteenth resistor, one end of the fourteenth resistor is coupled to the negative output end through the other end of the fourth winding, and the other end of the fourteenth resistor is grounded;

[0056] A second energy storage filter capacitor, wherein a positive electrode of the second energy storage filter capacitor is coupled to the output end of the switch chip, and a negative electrode of the second energy storage filter capacitor is grounded;

[0057] a third energy storage filter capacitor, wherein a positive electrode of the third energy storage filter capacitor is coupled to one end of the third winding, and a negative electrode of the third energy storage filter capacitor is coupled to the other end of the fourth winding;

[0058] A twelfth capacitor is coupled between the positive output terminal and the negative output terminal;

[0059] A second resistor group, one end of the second resistor group is coupled to the input end of the switch chip, and the other end of the second resistor group is coupled to the output end of the switch chip through a thirteenth capacitor.

[0060] Optionally, an RCD absorption circuit is further provided between the output end of the at least one rectifier bridge and the primary coil, and the RCD absorption circuit comprises:

[0061] a third resistor group, one end of the third resistor group is coupled to the first end, and the other end of the third resistor group is coupled to the second end;

[0062] a fourteenth capacitor, the fourteenth capacitor being connected in parallel with the third resistor group;

[0063] a fourth resistor group, one end of the fourth resistor group is coupled to one end of the third resistor group, and the other end of the fourth resistor group is coupled to the second end;

[0064] A first diode group, wherein an anode of the first diode group is coupled to the third end, and a cathode of the first diode group is coupled to the other end of the fourth resistor group.

[0065] A second aspect of the present disclosure provides a floor scrubber charger, characterized by comprising any one of the charger power supply circuits described above.

[0066] The beneficial effects of the present disclosure are as follows: by adopting a power chip, the circuit energy efficiency exceeds 90%, which means that the energy loss in the power conversion process is greatly reduced, which is helpful for energy conservation and emission reduction, and improves the green energy-saving attributes of the equipment. The high-frequency radiation is effectively suppressed by the setting of multiple capacitors and transformers, ensuring that the power supply product not only meets the strict EMI (electromagnetic compatibility) standards, but also maintains good electromagnetic environment compatibility under high-frequency working conditions; the feedback regulation mechanism adopted enables the power supply output voltage to be dynamically adjusted according to the actual load demand, and through the cooperation of the feedback chip and the optocoupler component, precise voltage control is achieved, which enhances the working stability and long-term reliability of the entire power supply circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1A circuit schematic diagram showing a charger power supply circuit in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] In the related art, first, the power conversion efficiency is low, especially under light load conditions, which leads to energy waste and increased operating costs. Secondly, the adaptability to voltage and current fluctuations is limited, especially when the grid voltage is unstable or the load changes rapidly, the stability of the output voltage is difficult to guarantee, which may affect the safety and performance of the connected equipment. Furthermore, the feedback regulation mechanism in the related art often responds slowly, making the voltage adjustment not fast and accurate enough, especially in application scenarios that require rapid response to load changes, the user experience is poor. Finally, electromagnetic compatibility (EMC) issues are also common challenges. Inadequately filtered noise and radiation may interfere with the normal operation of surrounding electronic equipment, and also fail to meet increasingly stringent electromagnetic compatibility standards.

[0078] A first aspect of the present disclosure provides a charger power supply circuit, wherein Figure 1 In the example, it includes: an input circuit, a transformer T1, a power chip, an output circuit, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4.

[0079] An input terminal of the input circuit is coupled to an external power source.

[0080] The transformer T1 includes a primary coil, an auxiliary coil and a secondary coil. 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.

[0081] The output end of the input circuit is coupled to the first end 1 through a first rectifier bridge Q1 and a second rectifier bridge Q2 .

[0082] The power chip includes a plurality of power input terminals SW, a power supply terminal VDD and a feedback terminal FB. The plurality of power input terminals SW are coupled to the second terminal 2. The power supply terminal VDD is coupled to the third terminal 3 through a power supply circuit. The feedback terminal FB is coupled to a feedback chip through an optical coupling component O.

[0083] An input terminal of the output circuit is coupled to the secondary coil, and an output terminal of the output circuit is coupled to an external load.

[0084] The feedback chip is coupled between the input terminal and the output terminal of the output circuit.

[0085] The feedback chip generates a feedback signal through the optical coupling component O according to the output voltage of the output circuit, and feeds the feedback signal back to the feedback terminal FB.

[0086] The power chip adjusts the on-off of the primary coil according to the feedback signal to adjust the output voltage of the output circuit.

[0087] One end of the first capacitor C1 is coupled to the first terminal 1 , and the other end of the first capacitor C1 is grounded via the second capacitor C2 .

[0088] One end of the third capacitor C3 is coupled to the fourth end 4 , and the other end of the third capacitor C3 is grounded via the fourth capacitor C4 .

[0089] Specifically, in some embodiments, the output end of the input circuit outputs a DC power supply through a dual rectifier bridge (a first rectifier bridge Q1 and a second rectifier bridge Q2), thereby improving the efficiency and robustness of the initial rectification stage and maintaining stable energy conversion even when the input voltage fluctuates greatly.

[0090] The two ends of the primary coil of the transformer T1 are respectively connected to the first rectifier bridge Q1 and the multi-way power input terminal SW of the power chip, while the third and fourth ends of the auxiliary coil are connected to the power supply terminal VDD of the power chip through the power supply circuit. This design not only optimizes the power distribution, but also improves the overall energy efficiency of the system.

[0091] The feedback chip cooperates with the optocoupler component O to monitor the output voltage in real time, and transmits the feedback signal to the feedback terminal FB of the power chip in the form of a photoelectric signal. The power chip quickly adjusts the on-off frequency and duty cycle of the primary coil based on the received feedback signal, achieving high-precision dynamic adjustment of the output voltage, greatly improving the response speed and load adaptability.

[0092] In order to further enhance the stability of the circuit and filter out noise, the charger power supply circuit is provided with a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4. These capacitors work together to not only filter out the ripple in the DC line, but also effectively improve the electromagnetic compatibility of the system, ensure the purity and smoothness of the output voltage, and reduce the electromagnetic interference to the external environment.

[0093] Optional, in Figure 1 In the example, the input circuit includes: a live line input terminal L, a neutral line input terminal N, a first common-mode suppression inductor T2, an adjustable resistor RV1 and a fifth capacitor C5.

[0094] One end of the live wire input terminal L is coupled to an external AC power source.

[0095] One end of the neutral line input terminal N is grounded.

[0096] The first common-mode suppression inductor T2 includes a first winding T21 and a second winding T22.

[0097] The other end of the live wire input terminal L is coupled to one end of the first winding T21 through a fuse, and the other end of the first winding T21 is connected to the first end 1 through the first rectifier bridge Q1.

[0098] The other end of the neutral line input terminal N is coupled to one end of the second winding T22, and the other end of the second winding T22 is coupled to the first end 1 through the second rectifier bridge Q2. An output end of the first rectifier bridge Q1 is coupled to an input end of the second rectifier bridge Q2.

[0099] The output ends of the first rectifier bridge Q1 and the second rectifier bridge Q2 are coupled to the first end 1 through a first inductor L1 .

[0100] One end of the adjustable resistor RV1 is coupled to the first end 1 , and the other end of the adjustable resistor RV1 is coupled to the third end 3 .

[0101] The first common-mode rejection inductor T2 is coupled between the adjustable resistor RV1 and the first common-mode rejection inductor T2 and connected in parallel with the adjustable resistor RV1.

[0102] Specifically, in some embodiments, one end of the live wire input terminal L is coupled to an external AC power source, and one end of the neutral wire input terminal N is grounded to ensure the correct electrical connection and safety of the circuit. The first common mode suppression inductor T2 is composed of two windings (a first winding T21 and a second winding T22) and is used to filter out common mode noise. The live wire and the neutral wire pass through the first winding T21 and the second winding T22 respectively, which effectively suppresses high-frequency interference in the power grid and improves the purity of the power supply.

[0103] The live wire input terminal L is connected to one end of the first winding T21 through a fuse to ensure that the circuit is protected in the event of overcurrent. Subsequently, the other end of the first winding T21 is connected to the first terminal 1 through the first rectifier bridge Q1 to achieve preliminary conversion from AC to DC. Similarly, the neutral wire input terminal N is connected to the second rectifier bridge Q2 through the second winding T22, and finally the two rectified DC currents converge at the first terminal 1, thereby enhancing the efficiency and stability of the circuit. The output ends of the first rectifier bridge Q1 and the second rectifier bridge Q2 are coupled to the first terminal 1 through a first inductor L1 to further smooth the DC output and reduce ripple. This design improves the stability of the output voltage.

[0104] An adjustable resistor RV1 is added to the input circuit, one end of which is connected to the first end 1 and the other end is connected to the third end 3. The output voltage of the circuit is fine-tuned through the adjustable resistor RV1 to adapt to different load requirements or compensate for voltage drift caused by factors such as temperature. At the same time, the fifth capacitor C5 is connected in parallel between the adjustable resistor RV1 and the first common-mode suppression inductor T2 as a high-frequency filter to further purify the output DC power and improve the power quality.

[0105] In some embodiments, a fourth energy storage filter capacitor EC4 , a fifth energy storage filter capacitor EC5 , and a sixth energy storage filter capacitor EC6 are respectively connected to both ends of the first inductor L1 .

[0106] The positive electrode of the fourth energy storage filter capacitor EC4 is coupled to one end of the first inductor L1, ensuring that the DC current output from the rectifier bridge can first enter C4 for preliminary filtering and energy storage after passing through the inductor. The positive electrode of the fifth energy storage filter capacitor EC5 is coupled to the other end of the first inductor L1 to form a symmetrical filtering structure, which effectively balances the current fluctuation and reduces the impact of the reverse voltage spike on the circuit. The fourth energy storage filter capacitor EC4, the fifth energy storage filter capacitor EC5 and the sixth energy storage filter capacitor EC6 are connected in parallel, which increases the total capacitance value, not only improves the filtering effect, reduces the ripple of the output voltage, but also enhances the circuit's ability to withstand instantaneous large currents, ensuring the smoothness and stability of the power supply output. The negative electrodes of the fourth energy storage filter capacitor EC4, the fifth energy storage filter capacitor EC5 and the sixth energy storage filter capacitor EC6 are all coupled to the second end 2 of the primary coil.

[0107] Optional, in Figure 1 In an example, the power supply circuit includes:

[0108] A first diode D1 , wherein an anode of the first diode D1 is coupled to the third terminal 3 via a first resistor R1 , and a cathode of the first diode D1 is coupled to the power supply terminal VDD.

[0109] A first energy storage filter capacitor EC1, wherein the positive electrode of the first energy storage filter capacitor EC1 is coupled to the negative electrode of the first diode D1, and the negative electrode of the first energy storage filter capacitor EC1 is grounded.

[0110] The sixth capacitor C6 is connected in parallel with the first energy storage filter capacitor EC1.

[0111] Specifically, in some embodiments, the positive electrode of the first diode D1 is connected to the third terminal 3 through the first resistor R1, ensuring the unidirectional flow of current to limit the current direction on the auxiliary coil. The positive electrode of the first energy storage filter capacitor EC1 is connected to the negative electrode of the first diode D1, and the negative electrode is grounded. The energy storage characteristics of the capacitor are utilized to absorb and filter the ripple voltage in the circuit, providing a smoother DC output, which plays an important role in improving the quality of power supply and protecting the sensitive electronic components at the back end. In order to further enhance the filtering effect and improve the processing capability of transient response, the sixth capacitor C6 is connected in parallel with the first energy storage filter capacitor EC1, which can significantly increase the equivalent capacitance value, more effectively filter high-frequency noise, and increase the instantaneous current supply capacity of the circuit, ensuring that the voltage stability of the power supply output is not affected when the load changes.

[0112] Optional, in Figure 1 In the example, the secondary coil includes a fifth terminal 5 and a sixth terminal 6. The output terminal of the output circuit includes a positive output terminal V+ and a negative output terminal V-.

[0113] exist Figure 1 In an example, the output circuit includes:

[0114] A switch chip, wherein the input end of the switch chip is coupled to the fifth end 5 , and the output end of the switch chip is coupled to the positive output end V+ through a second inductor L2 .

[0115] The connection point between the output end of the switch chip and the second inductor L2 forms a secondary output end between the input end and the output end of the output circuit.

[0116] The second common mode suppression inductor T3 includes a third winding T31 and a fourth winding T32. One end of the third winding T31 is coupled to the second inductor L2, and the other end of the third winding T31 is coupled to the positive output terminal V+. One end of the fourth winding T32 is coupled to the negative output terminal V-.

[0117] A fourteenth resistor R14, one end of the fourteenth resistor R14 is coupled to the negative output terminal V- through the other end of the fourth winding T32, and the other end of the fourteenth resistor R14 is grounded.

[0118] A second energy storage filter capacitor EC2, wherein a positive electrode of the second energy storage filter capacitor EC2 is coupled to the output end of the switch chip, and a negative electrode of the second energy storage filter capacitor EC2 is grounded.

[0119] A third energy storage filter capacitor EC3, wherein a positive electrode of the third energy storage filter capacitor EC3 is coupled to one end of the third winding T31, and a negative electrode of the third energy storage filter capacitor EC3 is coupled to the other end of the fourth winding T32.

[0120] The twelfth capacitor C12 is coupled between the positive output terminal V+ and the negative output terminal V−.

[0121] The second resistor group RA2 has one end coupled to the input end of the switch chip, and the other end coupled to the output end of the switch chip via a thirteenth capacitor C13.

[0122] Specifically, in some embodiments, the secondary coil of the transformer T1 includes a fifth terminal 5 and a sixth terminal 6, which provide primary DC conversion for the output circuit. The input terminal of the switch chip is coupled to the fifth terminal 5 of the secondary coil. The output terminal of the switch chip is coupled to the positive output terminal V+ through the second inductor L2. This design helps to smooth the current and reduce ripple. As an example, in Figure 1 In the example, the switch chip is a diode connected in parallel, the anode of the diode is the input terminal of the switch chip, and the cathode of the diode is the output terminal of the switch chip.

[0123] The second common-mode suppression inductor T3 is composed of a third winding T31 and a fourth winding T32. One end of the third winding T31 is coupled to the second inductor L2, and the other end is connected to the positive output terminal V+, while one end of the fourth winding T32 is connected to the negative output terminal V-, and the other end is grounded through the fourteenth resistor R14, which effectively suppresses common-mode noise and improves the quality of power supply. The second energy storage filter capacitor EC2 and the third energy storage filter capacitor EC3 are respectively coupled between the output end of the switch chip and the third winding T31, the fourth winding T32, and between the positive output terminal V+ and the negative output terminal V-, providing necessary energy storage and filtering functions to ensure the stability and purity of the output voltage. The twelfth capacitor C12 is connected across the positive output terminal V+ and the negative output terminal V-, as a decoupling capacitor at the output end, to further filter out high-frequency noise. The combination of the second resistor group RA2 and the thirteenth capacitor C13 provides impedance matching and filtering between the input and output for the switch chip, optimizes the switch operation, and reduces electromagnetic interference.

[0124] Optional, in Figure 1 In the example, the optical coupling component O includes a transmitter O2 and a receiver O1 , one end of the receiver O1 is coupled to the feedback end FB, and the other end of the receiver O1 is grounded.

[0125] One end of the transmitter O2 is coupled to a secondary output end between an input end and an output end of the output circuit through a second resistor R2.

[0126] The feedback chip comprises: a feedback chip power supply terminal VCC, an output voltage feedback terminal VCTRL, an output current feedback terminal VSENSE, a reference terminal ICTRL, a feedback chip ground terminal SGND and a feedback chip output terminal VOUT.

[0127] The feedback chip power supply terminal VCC is coupled to the positive output terminal V+ of the output circuit through the third resistor R3. The output voltage feedback terminal VCTRL is coupled to a voltage feedback circuit. The output current feedback terminal VSENSE is coupled to the negative output terminal V- through the fourth resistor R4. The reference terminal ICTRL is grounded. The feedback chip ground terminal SGND is grounded. The output terminal of the feedback chip is coupled to the other end of the transmitter O2.

[0128] The fifth resistor R5 is coupled between two ends of the emitter O2.

[0129] Specifically, in some embodiments, the feedback terminal FB of the power chip realizes precise regulation of the output voltage and current through the optical coupling component O and the feedback chip to ensure efficient and stable operation of the circuit. The optical coupling component O includes a transmitter O2 and a receiver O1, wherein one end of the receiver O1 is coupled to the feedback terminal FB of the power chip, and the other end is grounded to establish a stable reference potential. The receiver O1 can receive the photoelectric signal from the transmitter O2, and then adjust the output control strategy of the power chip according to the signal strength to control the on and off of the primary coil. The output circuit has a positive output terminal V+ and a negative output terminal V-, which meet the output requirements of direct current and provide a stable power supply for the external load, and the external load is coupled between the positive output terminal V+ and the negative output terminal V-. One end of the transmitter O2 is connected to the secondary output end of the output circuit through the second resistor R2, that is, coupled between the output end of the switch chip and the second inductor L2, to obtain the output voltage without passing through the external load.

[0130] The power supply terminal VDD of the feedback chip is connected to the positive output terminal V+ of the output circuit through the third resistor R3 to ensure the stable working voltage of the feedback chip. The output voltage feedback terminal VCTRL is connected to a voltage feedback circuit for real-time monitoring and feedback of output voltage information. And the current frequency of the transmitter O2 is adjusted according to the voltage difference between one side of the second resistor R2 and the output terminal. The output current feedback terminal VSENSE is connected to the negative output terminal V- through the fourth resistor R4, and the sampled current signal is sent to the current feedback terminal FB of the feedback chip to monitor the output current. The reference terminal ICTRL is grounded to provide a reference level for the feedback chip. The feedback chip ground terminal SGND is also grounded to ensure the stability of the signal reference. The output end of the feedback chip is coupled to the other end of the transmitter O2 to form a signal transmission path for closed-loop control.

[0131] Furthermore, the output voltage is monitored by a voltage feedback circuit, and the signal is sent to the voltage feedback terminal FB of the feedback chip. The voltage signal is compared with the reference voltage inside the feedback chip. If the output voltage is detected to deviate from the set value, the feedback chip will output an error signal. The error signal is transmitted to the transmitter O2 of the optocoupler component O through the output terminal of the feedback chip. The transmitter O2 generates a current based on the strength of the error signal and the output voltage detected by the second resistor R2. When the output voltage is too high, the feedback signal will reduce the current of the transmitter O2, and vice versa.

[0132] The feedback chip will adjust its output again according to the current feedback signal to ensure that the output current does not exceed the set value. The current feedback and voltage feedback work together to achieve precise control of the output power.

[0133] In some embodiments, connecting a fifth resistor R5 between the two ends of the transmitter O2 helps stabilize the working state of the transmitter O2, adjust the current inside the optocoupler, further improve the linearity and stability of signal transmission, and ensure the accuracy of feedback control.

[0134] Optional, in Figure 1 In an example, the voltage feedback circuit includes:

[0135] A sixth resistor R6, one end of which is coupled to the positive output terminal V+, and the other end of which is grounded via a seventh resistor R7. A connection point between the sixth resistor R6 and the seventh resistor R7 is coupled to the output voltage feedback terminal VCTRL.

[0136] The eighth resistor R8 is connected in parallel with the seventh resistor R7.

[0137] Specifically, in some embodiments, one end of the sixth resistor R6 is connected to the positive output terminal V+ to ensure that it can monitor the actual level of the output voltage in real time. The other end is grounded through the seventh resistor R7 to form a voltage divider circuit. The voltage at the connection point between the sixth resistor R6 and the seventh resistor R7 is used as the sampled value of the output voltage. The sampled voltage is coupled to the output voltage feedback terminal VCTRL, and the feedback chip can obtain an electrical signal proportional to the output voltage in real time as a basis for subsequent adjustment. The eighth resistor R8 is connected in parallel with the seventh resistor R7, which not only helps to shunt and reduce the heat load of a single resistor, but also can compensate for the resistance value drift caused by temperature changes to a certain extent, thereby improving the temperature stability of the entire feedback circuit. By connecting the eighth resistor R8 in parallel, the response speed and accuracy of the circuit to output voltage fluctuations can be optimized to ensure reliable feedback under different working conditions.

[0138] Optional, in Figure 1 The example also includes:

[0139] A seventh capacitor C7, one end of the seventh capacitor C7 is coupled to one end of the fourth resistor R4, and the other end of the seventh capacitor C7 is coupled to the fifth resistor R5 through a ninth resistor R9.

[0140] The eighth capacitor C8 is coupled between the feedback chip power supply terminal VCC and the reference terminal ICTRL.

[0141] A ninth capacitor C9, one end of the ninth capacitor C9 is coupled to the output voltage feedback end VCTRL, and the other end of the ninth capacitor C9 is coupled to the ninth resistor R9 via a tenth resistor R10.

[0142] The feedback chip output terminal VOUT is coupled to a connection point between the ninth resistor R9 and the tenth resistor R10 .

[0143] Specifically, in some embodiments, one end of the seventh capacitor C7 is connected to one end of the fourth resistor R4, and the other end is coupled to the fifth resistor R5 through the ninth resistor R9 to form a high-frequency noise filtering link. The seventh capacitor C7 can filter out the high-frequency interference from the voltage feedback path, and the ninth resistor R9 plays the role of current limiting and voltage division. The eighth capacitor C8 is coupled between the power supply terminal VDD and the reference terminal ICTRL of the feedback chip to filter out the ripple and noise on the power supply line. The ninth capacitor C9 can respond quickly to the voltage fluctuation caused by the rapidly changing load, and quickly adjust the feedback signal through its charge and discharge characteristics. The tenth resistor R10 is used to control the speed and stability of this adjustment process, and jointly optimize the dynamic performance of the feedback control. The output end of the feedback chip is coupled to the connection point between the ninth resistor R9 and the tenth resistor R10 to ensure that the feedback signal can be adjusted based on the pure and stable signal after all the above filtering and compensation measures, thereby controlling the output of the main circuit, and realizing efficient and accurate control of the output voltage and current.

[0144] Optional, in Figure 1 In the example, the power chip further includes: an overcurrent detection terminal CS, an overvoltage detection terminal DMG, an operating frequency setting terminal FSET, and a power chip ground terminal GND.

[0145] The over-current detection terminal CS is grounded through a first resistor group RA1.

[0146] The overvoltage detection terminal DMG is coupled to the fourth terminal 4 through an overvoltage detection circuit.

[0147] The overvoltage detection circuit includes: an eleventh resistor R11, a twelfth resistor R12 and a tenth capacitor C10.

[0148] One end of the eleventh resistor R11 is coupled to the third end 3, and the other end of the eleventh resistor R11 is grounded through the twelfth resistor R12. The overvoltage detection terminal DMG is coupled to the connection point between the eleventh resistor R11 and the twelfth resistor R12. The tenth capacitor C10 is connected in parallel with the twelfth resistor R12.

[0149] The operating frequency setting terminal FSET is grounded via a thirteenth resistor R13.

[0150] The ground terminal GND of the power chip is grounded.

[0151] The eleventh capacitor C11 is coupled between the feedback terminal FB and the ground terminal GND of the power chip.

[0152] Specifically, in some embodiments, when the current in the circuit increases abnormally and exceeds a preset threshold, the first resistor group RA1 will generate a corresponding voltage drop, and this signal will be detected by the power chip, thereby triggering a protection mechanism to cut off or reduce the output current in time to prevent circuit damage. The overvoltage detection terminal DMG is connected to the fourth terminal 4 of the auxiliary coil through an overvoltage detection circuit, and the overvoltage detection circuit includes an eleventh resistor R11, a twelfth resistor R12 and a tenth capacitor C10. The overvoltage detection terminal DMG is coupled to the connection point of the eleventh resistor R11 and the twelfth resistor R12, and the voltage change here reflects the state of the output voltage at the primary coil.

[0153] The tenth capacitor C10 is connected in parallel with the twelfth resistor R12 to filter out high-frequency noise and ensure the accuracy of overvoltage detection. The maximum operating frequency setting terminal FSET of the power chip is grounded through the thirteenth resistor R13, allowing the switching operating frequency of the power chip to be adjusted by changing the external circuit or the resistance value to adapt to different load requirements or optimize efficiency. The ground terminal of the power chip is grounded to ensure the stability of the reference potential of the circuit. At the same time, the eleventh capacitor C11 is coupled between the feedback terminal FB and the ground terminal GND of the power chip, which plays a role in high-frequency filtering, improves the purity of the feedback signal, and is conducive to improving system stability and control accuracy.

[0154] In some embodiments, the fifteenth resistor R15 is coupled between the power input terminal SW and the over-current detection terminal CS, and plays a role of high-frequency filtering.

[0155] Optional, in Figure 1 In the example, an RCD absorption circuit is further provided between the output end of the at least one rectifier bridge and the primary coil, and the RCD absorption circuit includes:

[0156] The third resistor group RA3 has one end coupled to the first end 1 , and the other end coupled to the second end 2 .

[0157] A fourteenth capacitor C14 is connected in parallel with the third resistor group RA3.

[0158] The fourth resistor group RA4 has one end coupled to one end of the third resistor group RA3 , and the other end coupled to the second end 2 .

[0159] The first diode group DA1 has an anode coupled to the third end 3 , and a cathode coupled to the other end of the fourth resistor group RA4 .

[0160] Specifically, in some embodiments, the third resistor group RA3 functions as current limiting to suppress current shocks during transient voltage spikes. The fourteenth capacitor C14 is used for energy storage, which can absorb and temporarily store high-frequency transient energy caused by the switching action, thereby reducing the impact of voltage spikes and current surges on the rest of the circuit. The fourth resistor group RA4 is used to control the current in the RCD loop, and together with the third resistor group RA3, forms a more precise damping mechanism to optimize transient response. The first diode group DA1 plays the role of unidirectional conduction, allowing current to flow only in a specific direction. When the voltage in the circuit rises instantly, it can quickly conduct and direct the overvoltage energy to a predetermined path for release, protecting the subsequent circuit from damage.

[0161] A second aspect of the present disclosure provides a floor scrubber charger, characterized by comprising any one of the charger power supply circuits described above.

[0162] 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 charger power supply circuit, characterized in that: include: An input circuit, an input terminal of the input circuit being coupled to an external power source; A transformer, the transformer comprising a primary coil, an auxiliary coil and a secondary coil; the primary coil comprises a first end and a second end; the auxiliary coil comprises a third end and a fourth end; The output end of the input circuit is coupled to the first end through a first rectifier bridge and a second rectifier bridge; A power chip, the power chip comprising a plurality of power input terminals, a power supply terminal and a feedback terminal; the plurality of power input terminals are all coupled to the second terminal; the power supply terminal is coupled to the third terminal via a power supply circuit; the feedback terminal is coupled to a feedback chip via an optical coupling component; an output circuit, wherein an input end of the output circuit is coupled to the secondary coil, and an output end of the output circuit is coupled to an external load; The feedback chip is coupled between the input terminal and the output terminal of the output circuit; The feedback chip generates a feedback signal through the optical coupling component according to the output voltage of the output circuit, and feeds the feedback signal back to the feedback terminal; The power chip adjusts the on / off of the primary coil according to the feedback signal to adjust the output voltage of the output circuit; A first capacitor, one end of the first capacitor is coupled to the first end, and the other end of the first capacitor is grounded through a second capacitor; A third capacitor, one end of the third capacitor is coupled to the fourth end, and the other end of the third capacitor is grounded through the fourth capacitor.

2. The charger 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 an external AC power source; A zero line input terminal, one end of which is grounded; A first common-mode suppression inductor, wherein the first common-mode suppression inductor includes a first winding and a second winding; The other end of the live wire input end is coupled to one end of the first winding through a fuse, and the other end of the first winding is connected to the first end through the first rectifier bridge; The other end of the zero line input end is coupled to one end of the second winding, and the other end of the second winding is coupled to the first end through the second rectifier bridge; an output end of the first rectifier bridge is coupled to an input end of the second rectifier bridge; The output ends of the first rectifier bridge and the second rectifier bridge are coupled to the first end through a first inductor; an adjustable resistor, one end of the adjustable resistor being coupled to the first end, and the other end of the adjustable resistor being coupled to the third end; The fifth capacitor is coupled between the adjustable resistor and the first common-mode suppression inductor and is connected in parallel with the adjustable resistor.

3. The charger 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 third end via a first resistor, and a cathode of the first diode is coupled to the power supply end; a first energy storage filter capacitor, wherein a positive electrode of the first energy storage filter capacitor is coupled to a negative electrode of the first diode, and a negative electrode of the first energy storage filter capacitor is grounded; A sixth capacitor is connected in parallel with the first energy storage filter capacitor.

4. The charger power supply circuit according to claim 1, characterized in that: The optical coupling component includes 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; The output end of the output circuit includes a positive output end and a negative output end; One end of the transmitter is coupled to a secondary output end between an input end and an output end of the output circuit through a second resistor; The feedback chip comprises: a feedback chip power supply terminal, an output voltage feedback terminal, an output current feedback terminal, a reference terminal, a feedback chip ground terminal and a feedback chip output terminal; The feedback chip power supply terminal is coupled to the positive output terminal of the output circuit through a third resistor; the output voltage feedback terminal is coupled to a voltage feedback circuit; the output current feedback terminal is coupled to the negative output terminal through a fourth resistor; the reference terminal is grounded; the feedback chip ground terminal is grounded; the output terminal of the feedback chip is coupled to the other terminal of the transmitter; The fifth resistor is coupled between two ends of the transmitter.

5. The charger power supply circuit according to claim 4, characterized in that: The voltage feedback circuit comprises: a sixth resistor, one end of the sixth resistor being coupled to the positive output terminal, and the other end of the sixth resistor being grounded via a seventh resistor; and a connection point between the sixth resistor and the seventh resistor being coupled to the output voltage feedback terminal; An eighth resistor is connected in parallel with the seventh resistor.

6. The charger power supply circuit according to claim 4, characterized in that: Also includes: a seventh capacitor, one end of the seventh capacitor being coupled to one end of the fourth resistor, and the other end of the seventh capacitor being coupled to the fifth resistor via a ninth resistor; an eighth capacitor, coupled between the feedback chip power supply terminal and the reference terminal; a ninth capacitor, one end of the ninth capacitor being coupled to the output voltage feedback end, and the other end of the ninth capacitor being coupled to the ninth resistor via a tenth resistor; The feedback chip output terminal is coupled to a connection point between the ninth resistor and the tenth resistor.

7. The charger power supply circuit according to claim 1, characterized in that: The power chip also includes: an overcurrent detection terminal, an overvoltage detection terminal, an operating frequency setting terminal and a power chip ground terminal; The overcurrent detection terminal is grounded through a first resistor group; The overvoltage detection terminal is coupled to the fourth terminal through an overvoltage detection circuit; The overvoltage detection circuit comprises: an eleventh resistor, a twelfth resistor and a tenth capacitor; One end of the eleventh resistor is coupled to the third end, and the other end of the eleventh resistor is grounded through the twelfth resistor; the overvoltage detection end is coupled to a connection point between the eleventh resistor and the twelfth resistor; the tenth capacitor is connected in parallel with the twelfth resistor; The operating frequency setting terminal is grounded via a thirteenth resistor; The grounding terminal of the power chip is grounded; The eleventh capacitor is coupled between the feedback terminal and the ground terminal of the power chip.

8. The charger power supply circuit according to claim 1, characterized in that: The secondary coil includes a fifth end and a sixth end; the output end of the output circuit includes a positive output end and a negative output end; Then the output circuit comprises: A switch chip, wherein the input end of the switch chip is coupled to the fifth end, and the output end of the switch chip is coupled to the positive output end via a second inductor; The connection point between the output end of the switch chip and the second inductor forms a secondary output end between the input end and the output end of the output circuit; The second common mode suppression inductor comprises a third winding and a fourth winding; one end of the third winding is coupled to the second inductor, and the other end of the third winding is coupled to the positive output end; one end of the fourth winding is coupled to the negative output end; a fourteenth resistor, one end of the fourteenth resistor is coupled to the negative output end through the other end of the fourth winding, and the other end of the fourteenth resistor is grounded; A second energy storage filter capacitor, wherein a positive electrode of the second energy storage filter capacitor is coupled to the output end of the switch chip, 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 one end of the third winding, and a negative electrode of the third energy storage filter capacitor is coupled to the other end of the fourth winding; A twelfth capacitor is coupled between the positive output terminal and the negative output terminal; A second resistor group, one end of the second resistor group is coupled to the input end of the switch chip, and the other end of the second resistor group is coupled to the output end of the switch chip through a thirteenth capacitor.

9. The charger power supply circuit according to claim 1, characterized in that: An RCD absorption circuit is also provided between the output end of the at least one rectifier bridge and the primary coil, and the RCD absorption circuit comprises: a third resistor group, one end of the third resistor group is coupled to the first end, and the other end of the third resistor group is coupled to the second end; a fourteenth capacitor, the fourteenth capacitor being connected in parallel with the third resistor group; a fourth resistor group, one end of the fourth resistor group is coupled to one end of the third resistor group, and the other end of the fourth resistor group is coupled to the second end; A first diode group, wherein an anode of the first diode group is coupled to the third end, and a cathode of the first diode group is coupled to the other end of the fourth resistor group.

10. A floor scrubber charger, characterized in that: The charger comprises a power supply circuit as described in any one of claims 1 to 9.

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