Multipath output power supply

Abstract

The utility model provides a multi-path output power supply which comprises a pulse width modulator and a voltage output circuit, the pulse width modulator and the voltage output circuit are electrically connected through a transformer T1, the pulse width modulator comprises an operational amplifier U1, the sixth end of the operational amplifier U1 is electrically connected with the X2 end of the transformer T1, and the sixth end of the operational amplifier U1 is electrically connected with the X2 end of the transformer T1. The X1 end of the transformer T1 is electrically connected with the voltage input end VIN; the voltage output circuit comprises a main path output circuit and an auxiliary path output circuit, and the main path output circuit and the auxiliary path output circuit are electrically connected with the transformer T1. According to the technical scheme, the pulse width modulator and the voltage output circuit are arranged, so that the power supply which is large in output path number, small in size, high in efficiency and small in ripple wave is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, in particular to a multi-output power supply. BACKGROUND

[0002] The existing multi-output power supply, which provides independent output voltage and current for multiple electronic devices, has the following shortcomings:

[0003] I. Complexity of hardware circuit and software control

[0004] Hardware design complexity: Multi-output power supply requires multiple independent output channels, each of which can independently adjust the output voltage and current to meet the specific power requirements of different loads. This leads to relatively complex hardware circuit design, requiring more components and more delicate circuit design.

[0005] High software control requirements: In order to ensure the stability and accuracy of the output of each channel, the control of multi-output power supply requires higher technical level and complex program design. This increases the difficulty of development and maintenance, and also increases the cost.

[0006] II. Challenges of output accuracy and load regulation rate

[0007] Limited output accuracy: Although the design goal of multi-output power supply is to provide stable and accurate output voltage and current, in actual application, the output accuracy may be limited to a certain extent due to various factors such as component accuracy, temperature changes, etc.

[0008] Load regulation rate problem: The voltage of non-regulated output will change with the load of this channel (load regulation rate), and will also be affected by the load size of other channels (cross regulation rate). This may cause the output voltage or current to fail to meet the specific requirements of the load under certain load conditions. CONTENT OF THE INVENTION

[0009] The present application provides a multi-output power supply to realize a power supply with multiple output channels, small size, high efficiency, and small ripple.

[0010] The present application provides a multi-output power supply, comprising: a pulse width modulator and a voltage output circuit, the pulse width modulator and the voltage output circuit are electrically connected through a transformer T1, wherein,

[0011] The pulse width modulator comprises an operational amplifier U1, the sixth end of the operational amplifier U1 is electrically connected with the X2 end of the transformer T1, and the X1 end of the transformer T1 is electrically connected with a voltage input end VIN;

[0012] The voltage output circuit comprises a main path output circuit and an auxiliary path output circuit, and the main path output circuit and the auxiliary path output circuit are electrically connected to the transformer T1 respectively.

[0013] In the technical scheme, the pulse width modulator and the voltage output circuit are arranged, the pulse width modulator and the voltage output circuit are electrically connected through the transformer T1, the pulse width modulator comprises an operational amplifier U1, the sixth end of the operational amplifier U1 is electrically connected to the X2 end of the transformer T1, and the X1 end of the transformer T1 is electrically connected to the voltage input end VIN; the voltage output circuit comprises a main path output circuit and an auxiliary path output circuit, and the main path output circuit and the auxiliary path output circuit are electrically connected to the transformer T1 respectively; and the power supply with the advantages of multiple output paths, small size, high efficiency, and small ripple is realized.

[0014] In a specific embodiment, the main path output circuit comprises a fifth voltage stabilizing tube D5, wherein,

[0015] The conducting end of the fifth voltage stabilizing tube D5 is electrically connected to the Y2 end of the transformer T1, the non-conducting end of the fifth voltage stabilizing tube D5 is electrically connected to the first end of a thirty-sixth resistor R36, and the second end of the thirty-sixth resistor R36 is electrically connected to the Y1 end of the transformer T1.

[0016] In a specific embodiment, the main path output circuit further comprises a tenth resistor R10 and a thirty-ninth capacitor C39, wherein,

[0017] The tenth resistor R10 and the thirty-ninth capacitor C39 are connected in parallel to the thirty-sixth resistor R36.

[0018] In a specific embodiment, the auxiliary path output circuit comprises a sixth voltage stabilizing tube D6, wherein,

[0019] The conducting end of the sixth voltage stabilizing tube D6 is electrically connected to the Y4 end of the transformer T1, the non-conducting end of the sixth voltage stabilizing tube D6 is electrically connected to the first end of a thirty-seventh resistor R37, and the second end of the thirty-seventh resistor R37 is electrically connected to the Y3 end of the transformer T1.

[0020] In a specific embodiment, the auxiliary path output circuit further comprises a twelfth capacitor C12, wherein,

[0021] The twelfth capacitor C12 is connected in parallel to the thirty-seventh resistor R37.

[0022] In a specific embodiment, a feedback circuit is further included, wherein,

[0023] The feedback circuit is electrically connected to the main path output circuit.

[0024] The feedback circuit is electrically connected with the operational amplifier U1 through a photoelectric coupler U2.

[0025] In a specific embodiment, the feedback circuit comprises a diode U3, wherein,

[0026] The C end of the diode U3 is electrically connected with the second end of the photoelectric coupler U2, the first end of the photoelectric coupler U2 is electrically connected with the first end of the nineteenth resistor R19, the second end of the nineteenth resistor R19 is electrically connected with the cutoff end of the fifth voltage stabilizing tube D5;

[0027] The R end of the diode U3 is electrically connected with the first end of the seventeenth resistor R17, the second end of the seventeenth resistor R17 is electrically connected with the first end of the thirty-sixth resistor R36;

[0028] The A end of the diode U3 is grounded;

[0029] Further comprising a nineteenth capacitor C19, a twentieth capacitor C20 and an eighteenth resistor R18, wherein,

[0030] The nineteenth capacitor C19 is connected in parallel with the R end of the diode U3 and the C end of the diode U3; the twentieth capacitor C20 and the eighteenth resistor R18 are connected in parallel with the R end of the diode U3 and the A end of the diode U3;

[0031] The fourth end of the photoelectric coupler U2 is electrically connected with the eighth end of the operational amplifier U1;

[0032] The third end of the photoelectric coupler U2 is grounded.

[0033] In a specific embodiment, the sixth end of the operational amplifier U1 is electrically connected with the X2 end of the transformer T1 through a third MOS tube Q3;

[0034] The G end of the third MOS tube Q3 is electrically connected with the first end of a first resistor R1, the second end of the first resistor R1 is grounded;

[0035] The G end of the third MOS tube Q3 is electrically connected with the conducting end of a fourth diode D4, the cutoff end of the fourth diode D4 is electrically connected with the sixth end of the operational amplifier U1;

[0036] Further comprising an eighth resistor R8, which is connected in parallel with the fourth diode D4.

[0037] In a specific embodiment, the seventh end of the operational amplifier U1 is electrically connected with the voltage input end VIN through a first triode Q1;

[0038] The base of the first triode Q1 is electrically connected with the anode of the first diode D1; the cathode of the first diode D1 is grounded.

[0039] The second resistor R2 and the third resistor R3 are further included, wherein,

[0040] The second resistor R2 and the third resistor R3 are electrically connected with the voltage input terminal VIN in series, and the second resistor R2 is connected with the first diode D1 in parallel.

[0041] In one specific embodiment, the third terminal of the operational amplifier U1 is electrically connected with the first terminal of the seventh resistor R7, the second terminal of the seventh resistor R7 is electrically connected with the first terminal of the ninth resistor R9, and the second terminal of the ninth resistor R9 is grounded. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 The circuit diagram of the multi-output power supply provided by the embodiment of the present application is shown in the figure;

[0043] Figure 2 The circuit diagram of the eight-output power supply provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0044] The present application will be further described in detail by the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present application will become more apparent.

[0045] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. Unless specifically indicated otherwise, the drawings shown in the Figures are not necessarily to scale.

[0046] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0047] To facilitate the understanding of the multi-output power supply provided by the embodiments of the present application, the application scenarios thereof are first described. The multi-output power supply provided by the embodiments of the present application is used to realize a power supply with a large number of output channels, small size, high efficiency and small ripple. The existing multi-output power supply, that is, the power supply providing independent output voltage and current for multiple electronic devices, has the following disadvantages: 1. Complexity of hardware circuit and software control: complex hardware design: the multi-output power supply needs to use multiple independent output channels, and each channel can independently adjust the output voltage and current to meet the specific power requirements of different loads. This makes the design of the hardware circuit relatively complex, and more components and more delicate circuit design are required. High requirement for software control: in order to ensure the stability and accuracy of the output of each channel, the control of the multi-output power supply requires higher technical level and complex program design. This increases the difficulty of development and maintenance and also increases the cost. 2. Challenges of output accuracy and load regulation rate: limited output accuracy: although the design goal of the multi-output power supply is to provide stable and accurate output voltage and current, in actual application, the output accuracy may be limited to a certain extent due to various factors such as the accuracy of components, temperature changes, etc. Load regulation rate problem: the voltage of the non-stabilized output will change with the load of this channel (load regulation rate) and will also be affected by the load size of other channels (cross regulation rate). This may cause the output voltage or current to fail to meet the specific requirements of the load under certain load conditions. Therefore, the embodiments of the present application provide a multi-output power supply to realize a power supply with a large number of output channels, small size, high efficiency and small ripple. The embodiments will be described in detail below in combination with specific drawings.

[0048] Reference Figure 1 and Figure 2 , Figure 1 The circuit diagram of the multi-output power supply provided by the embodiments of the present application is shown in the following figure: Figure 2 The circuit diagram of the eight-output power supply provided by the embodiments of the present application is shown in the following figure.

[0049] In Figure 1 , the embodiments of the present application provide a multi-output power supply, comprising: a pulse width modulator and a voltage output circuit, the pulse width modulator and the voltage output circuit are electrically connected through a transformer T1, wherein

[0050] The pulse width modulator comprises an operational amplifier U1, the sixth terminal of the operational amplifier U1 is electrically connected with the X2 terminal of the transformer T1, and the X1 terminal of the transformer T1 is electrically connected with a voltage input terminal VIN.

[0051] The voltage output circuit comprises a main channel output circuit and an auxiliary channel output circuit, and the main channel output circuit and the auxiliary channel output circuit are respectively electrically connected with the transformer T1.

[0052] In the above technical solution, by setting the pulse width modulator and the voltage output circuit, the pulse width modulator and the voltage output circuit are electrically connected through the transformer T1, the pulse width modulator comprises an operational amplifier U1, the sixth end of the operational amplifier U1 is electrically connected with the X2 end of the transformer T1, and the X1 end of the transformer T1 is electrically connected with the voltage input end VIN; the voltage output circuit comprises a main path output circuit and an auxiliary path output circuit, and the main path output circuit and the auxiliary path output circuit are electrically connected with the transformer T1 respectively; the power supply with the advantages of multiple output paths, small size, high efficiency, and small ripple is realized.

[0053] In a specific embodiment, the main path output circuit comprises a fifth voltage stabilizing tube D5, wherein,

[0054] The conducting end of the fifth voltage stabilizing tube D5 is electrically connected with the Y2 end of the transformer T1, the cutoff end of the fifth voltage stabilizing tube D5 is electrically connected with the first end of the thirty-sixth resistor R36, and the second end of the thirty-sixth resistor R36 is electrically connected with the Y1 end of the transformer T1.

[0055] In a specific embodiment, the main path output circuit further comprises a tenth resistor R10 and a thirty-ninth capacitor C39, wherein,

[0056] The tenth resistor R10 and the thirty-ninth capacitor C39 are connected in parallel with the thirty-sixth resistor R36.

[0057] In a specific embodiment, the auxiliary path output circuit comprises a sixth voltage stabilizing tube D6, wherein,

[0058] The conducting end of the sixth voltage stabilizing tube D6 is electrically connected with the Y4 end of the transformer T1, the cutoff end of the sixth voltage stabilizing tube D6 is electrically connected with the first end of the thirty-seventh resistor R37, and the second end of the thirty-seventh resistor R37 is electrically connected with the Y3 end of the transformer T1.

[0059] In a specific embodiment, the auxiliary path output circuit further comprises a twelfth capacitor C12, wherein,

[0060] The twelfth capacitor C12 is connected in parallel with the thirty-seventh resistor R37.

[0061] In a specific embodiment, a feedback circuit is further included, wherein,

[0062] The feedback circuit is electrically connected with the main path output circuit;

[0063] The feedback circuit is electrically connected with the operational amplifier U1 through the optoelectronic coupler U2.

[0064] In a specific embodiment, the feedback circuit comprises a diode U3, wherein,

[0065] The C end of the diode U3 is electrically connected with the second end of the opto-coupler U2, the first end of the nineteenth resistor R19 is electrically connected with the first end of the opto-coupler U2, the second end of the nineteenth resistor R19 is electrically connected with the cut-off end of the fifth voltage stabilizing tube D5;

[0066] The R end of the diode U3 is electrically connected with the first end of the seventeenth resistor R17, the second end of the seventeenth resistor R17 is electrically connected with the first end of the thirty-sixth resistor R36;

[0067] The A end of the diode U3 is grounded;

[0068] Further comprising a nineteenth capacitor C19, a twentieth capacitor C20 and an eighteenth resistor R18, wherein,

[0069] The nineteenth capacitor C19 is connected in parallel with the R end of the diode U3 and the C end of the diode U3; the twentieth capacitor C20 and the eighteenth resistor R18 are connected in parallel with the R end of the diode U3 and the A end of the diode U3;

[0070] The fourth end of the opto-coupler U2 is electrically connected with the eighth end of the operational amplifier U1;

[0071] The third end of the opto-coupler U2 is grounded.

[0072] In a specific embodiment, the sixth end of the operational amplifier U1 is electrically connected with the X2 end of the transformer T1 through a third MOS tube Q3;

[0073] The G end of the third MOS tube Q3 is electrically connected with the first end of the first resistor R1, the second end of the first resistor R1 is grounded;

[0074] The G end of the third MOS tube Q3 is electrically connected with the conducting end of the fourth diode D4, the cut-off end of the fourth diode D4 is electrically connected with the sixth end of the operational amplifier U1;

[0075] Further comprising an eighth resistor R8, the eighth resistor R8 is connected in parallel with the fourth diode D4.

[0076] In a specific embodiment, the seventh end of the operational amplifier U1 is electrically connected with the voltage input end VIN through a first triode Q1;

[0077] The base of the first triode Q1 is electrically connected with the cut-off end of the first diode D1; the conducting end of the first diode D1 is grounded;

[0078] Further comprising a second resistor R2 and a third resistor R3, wherein,

[0079] The second resistor R2 and the third resistor R3 are connected in series with the voltage input terminal VIN, and the second resistor R2 is connected in parallel with the first diode D1.

[0080] In a specific embodiment, the third terminal of the operational amplifier U1 is connected to the first terminal of the seventh resistor R7, the second terminal of the seventh resistor R7 is connected to the first terminal of the ninth resistor R9, and the second terminal of the ninth resistor R9 is connected to the ground.

[0081] Reference Figure 2 The circuit diagram of the eight-way output power supply; Specifically, two pulse width modulators control each of the four-way outputs. Among the four-way outputs controlled by each pulse width modulator, one is the main output, and the remaining three are auxiliary outputs obtained by rectifying and filtering the transformer winding. The regulation of the output voltage is achieved by using the negative feedback principle, and the feedback sampling is obtained from the main road voltage. When the main road output voltage changes, the sampling and amplification circuit samples and amplifies the information, and the pulse width modulator changes the duty cycle through the opto-isolator feedback circuit. The power switch tube conduction time becomes shorter, the duty cycle becomes smaller, the transformer primary energy storage decreases, and the secondary voltage becomes lower, thereby achieving the function of stabilizing the output voltage. After the main road output is stabilized, the remaining three outputs can also be stabilized through the transformer mutual inductance effect.

[0082] Because the secondary winding rectification output will have obvious fluctuations when the load changes, and the input high and low end leakage inductance peak changes and the duty cycle changes will affect the voltage regulation. When designing the transformer, sandwich winding is used to achieve better magnetic core coupling and reduce leakage inductance. At the same time, through the secondary side pseudo load regulation, a better load regulation design is achieved, and the total efficiency is optimized to 76%, which meets the requirement of 73% of the protocol value, the voltage regulation rate is ≤0.5%, and the current regulation rate is ≤1.5%.

[0083] In the above technical solution, multiple outputs are achieved by a simple scheme, the size is small, and thick film hybrid integrated circuit is used; Compared with the existing technical advantages, the scheme is simple, the device is less, and the internal is controlled by two pulse width modulators, each of which controls four-way output. Among the four-way outputs controlled by each pulse width modulation, one is the main output, and the remaining three are obtained by rectifying and filtering the transformer winding. Through transformer design and pseudo load regulation, better load regulation and voltage regulation can be achieved, and higher efficiency requirements can be met.

[0084] Those skilled in the art know that the present application can be implemented as a system, a method or a computer program product.

[0085] Therefore, the present disclosure can be embodied in the form of hardware only, software only (including firmware, resident software, micro-code, etc.), or a combination thereof, which can be referred to as a "circuit", "module" or "system" hereinafter. Furthermore, in some embodiments, the present disclosure can also be embodied in the form of a computer program product that includes computer-readable program code.

[0086] Any combination of one or more computer-readable medium can be employed. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the above. More specific examples (a non-exhaustive list) of the computer-readable storage medium include: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0087] Although the embodiments of the present disclosure have been shown and described above, it should be understood that the above-described embodiments are exemplary, and should not be construed as limiting the present disclosure, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present disclosure. On this basis, various replacements and improvements can be made to the present disclosure, and these all fall within the scope of the present disclosure.

Claims

1. A multi-output power supply, characterized in that, include: A pulse width modulator and a voltage output circuit are electrically connected via a transformer T1. The pulse width modulator includes an operational amplifier U1, the sixth terminal of which is electrically connected to the X2 terminal of the transformer T1, and the X1 terminal of the transformer T1 is electrically connected to the voltage input terminal VIN. The voltage output circuit includes a main output circuit and an auxiliary output circuit, which are electrically connected to the transformer T1.

2. The multi-output power supply according to claim 1, characterized in that, The main output circuit includes a fifth Zener diode, D5, wherein... The conducting terminal of the fifth Zener diode D5 is electrically connected to the Y2 terminal of the transformer T1, the cutting terminal of the fifth Zener diode D5 is electrically connected to the first terminal of the thirty-sixth resistor R36, and the second terminal of the thirty-sixth resistor R36 is electrically connected to the Y1 terminal of the transformer T1.

3. The multi-output power supply according to claim 2, characterized in that, The main output circuit also includes a tenth resistor R10 and a thirty-ninth capacitor C39, wherein... The tenth resistor R10 and the thirty-ninth capacitor C39 are connected in parallel with the thirty-sixth resistor R36.

4. The multi-output power supply according to claim 3, characterized in that, The auxiliary output circuit includes a sixth Zener diode, D6, wherein... The conducting terminal of the sixth Zener diode D6 is electrically connected to the Y4 terminal of the transformer T1, the cutting terminal of the sixth Zener diode D6 is electrically connected to the first terminal of the thirty-seventh resistor R37, and the second terminal of the thirty-seventh resistor R37 is electrically connected to the Y3 terminal of the transformer T1.

5. The multi-output power supply according to claim 4, characterized in that, The auxiliary output circuit also includes a twelfth capacitor C12, wherein... The twelfth capacitor C12 is connected in parallel with the thirty-seventh resistor R37.

6. The multi-output power supply according to claim 5, characterized in that, It also includes a feedback circuit, in which, The feedback circuit is electrically connected to the main output circuit. The feedback circuit is electrically connected to the operational amplifier U1 via an optocoupler U2.

7. The multi-output power supply according to claim 6, characterized in that, The feedback circuit includes diode U3, wherein... The C terminal of the diode U3 is electrically connected to the second terminal of the optocoupler U2, the first terminal of the optocoupler U2 is electrically connected to the first terminal of the nineteenth resistor R19, and the second terminal of the nineteenth resistor R19 is electrically connected to the cutoff terminal of the fifth Zener diode D5. The R terminal of the diode U3 is electrically connected to the first terminal of the seventeenth resistor R17, and the second terminal of the seventeenth resistor R17 is electrically connected to the first terminal of the thirty-sixth resistor R36. Terminal A of diode U3 is grounded; It also includes the nineteenth capacitor C19, the twentieth capacitor C20, and the eighteenth resistor R18, among which, The nineteenth capacitor C19 is connected in parallel to the R terminal and the C terminal of the diode U3; the twentieth capacitor C20 and the eighteenth resistor R18 are connected in parallel to the R terminal and the A terminal of the diode U3. The fourth terminal of the optocoupler U2 is electrically connected to the eighth terminal of the operational amplifier U1. The third terminal of the optocoupler U2 is grounded.

8. The multi-output power supply according to claim 7, characterized in that, The sixth terminal of the operational amplifier U1 is electrically connected to the X2 terminal of the transformer T1 through the third MOS transistor Q3; The gate (G) terminal of the third MOS transistor Q3 is electrically connected to the first terminal of the first resistor R1, and the second terminal of the first resistor R1 is grounded. The gate (G) terminal of the third MOS transistor Q3 is electrically connected to the conducting terminal of the fourth diode D4, and the cut-off terminal of the fourth diode D4 is electrically connected to the sixth terminal of the operational amplifier U1. It also includes an eighth resistor R8, which is connected in parallel with the fourth diode D4.

9. The multi-output power supply according to claim 8, characterized in that, The seventh terminal of the operational amplifier U1 is electrically connected to the voltage input terminal VIN through the first transistor Q1; The base of the first transistor Q1 is electrically connected to the cutoff terminal of the first diode D1; the conduction terminal of the first diode D1 is grounded. It also includes a second resistor R2 and a third resistor R3, wherein, The second resistor R2 and the third resistor R3 are connected in series and then electrically connected to the voltage input terminal VIN. The second resistor R2 is connected in parallel with the first diode D1.

10. The multi-output power supply according to claim 9, characterized in that, The third terminal of the operational amplifier U1 is electrically connected to the first terminal of the seventh resistor R7, the second terminal of the seventh resistor R7 is electrically connected to the first terminal of the ninth resistor R9, and the second terminal of the ninth resistor R9 is grounded.

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