Primary side feedback POE separator
By designing a primary feedback POE separator, the switching time of the power tube switch is controlled by using the primary feedback signal of the transformer unit, the problems of high cost and low reliability of the market primary feedback POE separator are solved, and stable voltage output and cost reduction are achieved.
Patent Information
- Application Number
- CN202421757508.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-07-23
AI Technical Summary
The main side feedback POE separator power DC solution on the market mainly uses secondary side feedback (SSR) control, resulting in high overall cost and low reliability.
A primary feedback POE separator is designed. The electrical signal is input through the input unit. The controller controls the switching time of the power tube switch according to the primary feedback signal in the transformer unit, thereby controlling the output voltage, avoiding direct sampling from the output unit, and saving components such as optocouplers.
A stable voltage output is achieved, reducing overall cost and improving reliability.
Smart Images
Figure CN222954033U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of POE splitters, and in particular to a primary-side feedback POE splitter. Background Art
[0002] The main function of the POE splitter is to separate the power and data signals transmitted through the network cable, so as to provide power and data transmission for network devices that do not support POE power supply. The POE splitter separates the signal transmitted by the network cable into data signal and power signal, and transmits them separately through two output lines, one is the power output line, and the other is the network data signal output line, which is the ordinary network cable.
[0003] The primary-side feedback POE splitter power supply DC solution on the market mainly uses secondary-side feedback (SSR) control. There are certain problems with secondary-side feedback, such as the need for an optical coupler, which leads to higher overall cost and low reliability of the POE splitter. Utility Model Content
[0004] The technical problem to be solved by this application is that the primary side feedback POE splitter power supply DC solution on the market mainly uses secondary side feedback (SSR) control. There are certain problems with the secondary side feedback, such as the need for an optical coupler, which leads to a higher overall cost and low reliability of the primary side feedback POE splitter.
[0005] In order to solve the above technical problem or at least partially solve the above technical problem, the present application provides a primary side feedback POE splitter.
[0006] The utility model discloses a primary side feedback POE separator, which comprises an input unit, a control unit, a voltage transformation unit and an output unit;
[0007] The input unit and the control unit are arranged on the primary side of the transformer unit, the output unit is arranged on the secondary side of the transformer unit, the input unit is connected to the control unit, and the transformer unit is respectively connected to the input unit, the control unit and the output unit;
[0008] The control unit includes a controller and a power tube switch, and the controller is connected to the power tube switch.
[0009] Preferably, the transformer unit comprises a primary coil, an auxiliary coil and a secondary coil, the primary coil and the auxiliary coil are arranged on the primary side of the transformer unit, and the secondary coil is arranged on the secondary side of the transformer unit.
[0010] Preferably, the input unit is connected to the primary coil, the control unit is connected to the primary coil and the auxiliary coil, and the output unit is connected to the secondary coil.
[0011] Preferably, the drain of the power tube switch is connected to the current input end of the primary coil, the source is connected to the auxiliary coil, and the gate is connected to the controller.
[0012] Preferably, the control unit comprises two feedback resistors, the two feedback resistors are connected to the auxiliary coil, the two feedback resistors are connected in series, and the two feedback resistors are connected to the controller.
[0013] Preferably, the controller comprises a judgment module, and the judgment module controls the gate conduction time of the power tube switch.
[0014] Preferably, the input unit comprises an input terminal, a rectifying unit, and a signature circuit unit;
[0015] The input end is connected to the rectifying unit, and the rectifying unit is connected in parallel with the signature circuit unit.
[0016] Preferably, the input unit comprises a grading circuit unit, and the grading circuit unit is connected in parallel with the signature circuit unit.
[0017] Preferably, the input unit comprises an undervoltage lockout unit, and the undervoltage lockout unit is connected to the grading circuit unit.
[0018] Preferably, the undervoltage lockout unit comprises a conduction switch, and the conduction switch adopts a MOS tube.
[0019] The above technical solution provided by this application has the following advantages compared with the prior art:
[0020] The present application provides a primary feedback POE separator, which inputs an electrical signal through an input unit, and a controller controls the switching time of a power tube switch according to the primary feedback signal in a transformer unit, thereby controlling the output voltage on the secondary side of the transformer unit, and further controlling the voltage value output by the output unit. The primary side feedback is to infer the situation of the coil on the secondary side and further calculate the output unit by sampling the coil on the primary side of the transformer unit, thereby avoiding direct sampling from the output unit, thereby saving components such as optocouplers.
[0021] The controller obtains relevant feedback signals by comparing the number of turns and voltage of the auxiliary coil with the primary coil, thereby controlling the switching time of the power switch. The switching time of the power tube switch determines the amount of energy stored in the transformer, which directly affects the size of the secondary output voltage, and a stable voltage output can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0024] Figure 1 A circuit diagram of a primary feedback POE splitter provided in this application;
[0025] Figure 2 A circuit diagram of a primary-side feedback POE splitter provided in this application.
[0026] Description of reference numerals:
[0027] 1. Primary side feedback POE splitter;
[0028] 11. Input unit; 111. Input terminal; 112. Rectification unit; 113. Grading circuit unit; 114. Signature circuit unit; 115. Undervoltage lockout unit;
[0029] 12. control unit; 121. controller; 122. power tube switch;
[0030] 13. Transformer unit; 131. Primary coil; 132. Auxiliary coil; 133. Secondary coil;
[0031] 14. Output unit. DETAILED DESCRIPTION
[0032] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.
[0033] See also Figure 1-2 The utility model discloses a primary-side feedback POE separator 1, which can separate an input electrical signal into a power signal and a data signal.
[0034] The primary feedback POE separator 1 includes an input unit 11, a control unit 12, a transformer unit 13, and an output unit 14, wherein the input unit 11 inputs an electrical signal, the transformer unit 13 can transform the voltage on the primary side and output it on the secondary side, and the control unit 12 can adjust the output voltage from the primary side to the secondary side according to the coil feedback signal on the primary side of the motor of the transformer unit 13.
[0035] The input unit 11 and the control unit 12 are arranged on the primary side of the transformer unit 13, and the output unit 14 is arranged on the secondary side of the transformer unit 13. The input unit 11 is connected to the control unit 12, and the transformer unit 13 is respectively connected to the input unit 11, the control unit 12 and the output unit 14.
[0036] The transformer unit 13 is a transformer, and the transformer unit 13 includes a primary coil 131, an auxiliary coil 132, and a secondary coil 133. The primary coil 131 and the auxiliary coil 132 are both arranged on the primary side of the transformer unit 13, and the secondary coil 133 is arranged on the secondary side of the transformer unit 13. The input unit 11 is connected to the primary coil 131, the control unit 12 is connected to the primary coil 131 and the auxiliary coil 132, and the output unit 14 is connected to the secondary coil 133.
[0037] Six ports are set on the transformer unit 13, which are divided into a first port, a second port, a third port, a fourth port, a fifth port and a sixth port. The first port and the second port are respectively connected to the primary coil 131, the third port and the fourth port are respectively connected to the auxiliary coil 132, and the fourth port, the fifth port and the sixth port are respectively connected to the secondary coil 133.
[0038] The first port is a port for the primary coil 131 to be connected to the input unit 11, the second port is connected to the control unit 12, the third port and the fourth port are respectively connected to the control unit 12, and the fifth port and the sixth port are respectively connected to the output unit 14. The second port, the third port, and the fifth port are current input terminals 111, and the first port, the fourth port, and the sixth port are current output terminals.
[0039] The control unit 12 includes a controller 121 and a power tube switch 122, and the controller 121 is connected to the power tube switch 122. The controller 121 is used to obtain the feedback signal of the primary side of the transformer unit 13, detect the load change information, and control the frequency and time of the power tube switch 122 to control the output voltage value of the output unit 14.
[0040] Specifically, the primary feedback POE separator 1 inputs an electrical signal through the input unit 11, and the controller 121 controls the switching time of the power tube switch 122 according to the primary feedback signal in the transformer unit 13, thereby controlling the output voltage of the secondary side of the transformer unit 13, and further controlling the voltage value output by the output unit 14. The primary feedback is to infer the situation of the coil on the secondary side and further calculate the situation of the output unit 14 by sampling the coil on the primary side of the transformer unit 13, thereby avoiding direct sampling from the output unit 14, thereby saving components such as optocouplers.
[0041] It can be understood that the controller 121 detects load change information by collecting voltage changes in the auxiliary coil 132 winding, that is, the relevant feedback signal, thereby controlling the switching time of the power switch. The switching time of the power tube switch 122 determines the amount of energy stored in the transformer, which directly affects the size of the secondary side output voltage, and a stable voltage output can be obtained.
[0042] The drain of the power switch 122 is connected to the current input terminal 111 of the primary coil 131 , the source is connected to the auxiliary coil 132 , and the gate is connected to the controller 121 .
[0043] The control unit 12 includes two feedback resistors and a connecting resistor, the two feedback resistors are connected to the auxiliary coil 132, the two feedback resistors are connected in series, the two feedback resistors are connected to the controller 121, one end of the connecting resistor is connected to the second end of the primary coil 131, and the other end is connected to the controller 121.
[0044] The controller 121 includes a VCC terminal, a SW terminal, a FB terminal, and a CS terminal; wherein the VCC terminal is connected to the input unit 11, the SW terminal is connected to the gate of the power tube switch 122, the FB terminal is connected to the common terminal connected between two feedback resistors, and the common terminal of the connection resistor connected to the source of the power tube switch 122 is connected to the CS terminal.
[0045] The controller 121 includes a power module and a judgment module. The power module is connected to the judgment module. The power module is connected to the output end of the input unit 11 to drive the controller 121 to operate. The judgment module calculates the PWM duty ratio of the output signal of the FB end and the CS end according to the electrical signals obtained from the FB end and the CS end, and outputs an electrical signal at the SW end to control the frequency of the connected power tube switch 122. The time of the power tube switch 122 determines the energy stored in the transformer unit 13, which in turn affects the magnitude of the output voltage of the transformer unit 13, so that the output unit 14 outputs a stable voltage. When the controller 121 turns on the power tube switch 122 connected to the SW end, the current of the primary coil 131 of the transformer increases, and energy is stored in the primary coil 131 at this time. When the controller 121 turns off the power tube switch 122, the energy is transferred to the secondary coil 133 through the transformer unit 13, and the output voltage is output through rectification and filtering.
[0046] The voltage at 1 / 2 of the demagnetization time of each switching cycle of the power tube switch 122 is sampled through the FB terminal and maintained until the next cycle. It is then compared with the internal 3V reference voltage. The generated error is amplified by the internal error amplifier to generate a COMP voltage. According to the voltage value, an electrical signal is input through the external input unit 11 for frequency compensation, and the PWM duty cycle can be adjusted to achieve output voltage and current control.
[0047] Particularly, the controller 121 adopts a DCDC controller 121 , model number is TT9932.
[0048] The input unit 11 includes an input end 111, a rectification unit 112, a grading circuit unit 113, a signature circuit unit 114, and an undervoltage lockout unit 115. The input end 111 is connected to the rectification unit 112, the rectification unit 112 is connected in parallel to the signature circuit unit 114, the grading circuit unit 113 is connected in parallel to the signature circuit unit 114, and the undervoltage lockout unit 115 is connected to the grading circuit unit 113.
[0049] Among them, the input end 111 adopts an RJ45 port to access the network signal, which is a combination of the power signal and the data signal. Two bridge piles are set in the rectifier unit 112 to rectify the input electrical signal. The signature circuit unit 114 is provided with capacitors and resistors that comply with the IEEE802.3af protocol, so that the input unit 11 can determine whether it meets the input requirements. The signature circuit unit 114 includes a signature capacitor CS and a signature resistor RS. The signature resistor R1 adopts a common mode resistor with a resistance value of 23.75-26.25KΩ, and the signature capacitor CCS adopts a capacitor with a capacitance value less than 120NF.
[0050] The grading circuit unit 113 is disposed between the signature circuit unit 114 and the undervoltage lockout unit 115 , and can achieve power consumption grading of the powered device.
[0051] The undervoltage lockout unit 115 includes resistors R6, R7, diodes D5, D6 and a conduction switch Q5. The conduction switch Q5 adopts a MOS tube, and the two diodes adopt a voltage-stabilizing diode, which can limit the input and output voltage. When the input voltage is greater than 42V, the conduction switch Q5 is turned on to achieve the maximum level 0 power consumption, the grading circuit fails, and the transformer unit 13 is output at the maximum power.
[0052] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0054] 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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0055] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0056] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.
[0058] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these modifications and variations.
[0059] The above is a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. A primary side feedback POE splitter, characterized in that: It includes an input unit, a control unit, a voltage transformation unit, and an output unit; The input unit and the control unit are arranged on the primary side of the transformer unit, the output unit is arranged on the secondary side of the transformer unit, the input unit is connected to the control unit, and the transformer unit is respectively connected to the input unit, the control unit and the output unit; The control unit includes a controller and a power tube switch, and the controller is connected to the power tube switch.
2. The primary side feedback POE splitter according to claim 1, characterized in that: The transformer unit comprises a primary coil, an auxiliary coil and a secondary coil. The primary coil and the auxiliary coil are both arranged on the primary side of the transformer unit, and the secondary coil is arranged on the secondary side of the transformer unit.
3. The primary side feedback POE splitter according to claim 2, characterized in that: The input unit is connected to the primary coil, the control unit is connected to the primary coil and the auxiliary coil, and the output unit is connected to the secondary coil.
4. The primary side feedback POE splitter according to claim 2, characterized in that: The drain of the power tube switch is connected to the current input end of the primary coil, the source is connected to the auxiliary coil, and the gate is connected to the controller.
5. The primary side feedback POE splitter according to claim 1, characterized in that: The control unit includes two feedback resistors, the two feedback resistors are connected to the auxiliary coil, the two feedback resistors are connected in series, and the two feedback resistors are connected to the controller.
6. The primary side feedback POE splitter according to claim 1, characterized in that: The controller includes a power module and a judgment module. The power module is connected to the judgment module. The power module is respectively connected to the input unit and the power tube switch.
7. The primary side feedback POE splitter according to claim 1, characterized in that: The input unit includes an input terminal, a rectifying unit, and a signature circuit unit; The input end is connected to the rectifying unit, and the rectifying unit is connected in parallel with the signature circuit unit.
8. The primary side feedback POE splitter according to claim 7, characterized in that: The input unit includes a hierarchical circuit unit, and the hierarchical circuit unit is connected in parallel with the signature circuit unit.
9. The primary side feedback POE splitter according to claim 8, characterized in that: The input unit includes an under-voltage lockout unit connected to the classification circuit unit.
10. The primary side feedback POE splitter according to claim 9, characterized in that: The undervoltage lockout unit includes a conduction switch, and the conduction switch is a MOS tube.