Auxiliary power supply circuit with simple structure

Abstract

The utility model discloses an auxiliary power supply circuit with a simple structure, comprising an input module, the input module is electrically connected with a PWM generation module, the PWM generation module is electrically connected with a bootstrap boost module, the bootstrap boost module is electrically connected with an output module, and the output module is electrically connected with a power supply module. The PWM generation module is used for controlling the input module to input boost voltage to the bootstrap boost module, the bootstrap boost module is used for merging the boost voltage to boost a circuit of the bootstrap boost module, and the output module is used for outputting boosted stable voltage. According to the utility model, efficient voltage conversion and isolated output are realized through a simple circuit structure, and the circuit structure is compact, so that the circuit is more flexible and convenient to apply in the whole power supply system, and the complexity and cost of circuit design are reduced. In addition, the output module ensures the stability of the output voltage and meets the requirement of high-quality power supply of the system.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply circuit technical field more specifically, it is related to a kind of auxiliary power supply circuit with simple structure. BACKGROUND

[0002] In power electronic systems, such as server power supplies, data center power systems, or high-reliability industrial power supplies, the performance, efficiency, size, and reliability of the power supply are highly demanding. In these applications, complex circuit architectures are often used, including but not limited to bridge rectification and inversion, synchronous rectification technology, ORING diode protection mechanisms, and high-side current sampling, to achieve high-performance, high-reliability power conversion and distribution.

[0003] In these complex systems, auxiliary power supply is critical to ensure the normal operation of control units, drive circuits, and monitoring circuits. Due to the presence of multiple functional modules within the system, and for safety and electromagnetic compatibility considerations, these modules often need to be electrically isolated from each other. Therefore, the auxiliary power supply needs to provide multiple sets of isolated power supply voltages. Specifically, one auxiliary source needs to provide power to at least 7 different isolated grounds. For example, using a flyback transformer requires 8 windings, making transformer design difficult, low efficiency, large size, and posing a significant challenge to the design layout of the power supply.

[0004] The above deficiencies are yet to be improved. SUMMARY

[0005] To solve or alleviate the problems of existing transformer design difficulty, low efficiency, large size, and difficult design layout of the power supply, the utility model provides a kind of auxiliary power supply circuit with simple structure.

[0006] The utility model technical scheme is as follows:

[0007] A kind of auxiliary power supply circuit with simple structure, including input module, the input module is electrically connected with PWM generation module, the PWM generation module is electrically connected with bootstrap boost module, the bootstrap boost module is electrically connected with output module, the PWM generation module is used to control the input module to input boost voltage to the bootstrap boost module, the bootstrap boost module is used to incorporate boost voltage to make own circuit boost, the output module is used to output the stable voltage after boost.

[0008] Further, the PWM generation module includes a generator and a driver, the generator is used to input a PWM control signal to the driver, and the driver is connected to the input module and the bootstrap boost module to input a boost voltage to the bootstrap boost module.

[0009] Further, the generator is a digital signal processor, a single-chip microcomputer, a PWM chip, or a self-excited oscillation circuit.

[0010] Further, the driver is a driving chip or a totem pole driving circuit.

[0011] Further, the driving chip comprises an input pin for inputting a PWM control signal, an output pin for outputting a boosted voltage, a power supply pin connected to a power supply, and a ground pin connected to a ground.

[0012] Further, the bootstrap boosting module comprises a first anti-inrush diode and a first energy storage capacitor, a positive electrode of the first anti-inrush diode is connected to a first network, the first network is connected to a basic voltage input end, a negative electrode of the first anti-inrush diode is connected to a second end of the first energy storage capacitor and a second network, and a first end of the first energy storage capacitor is connected to the PWM generation module.

[0013] Further, the output module comprises a second anti-inrush diode and a second energy storage capacitor, a positive electrode of the second anti-inrush diode is connected to the bootstrap boosting module, a negative electrode of the second anti-inrush diode is connected to a first end of the second energy storage capacitor and a third network, the third network is connected to a high-voltage output end, and a second end of the second energy storage capacitor is connected to the first network.

[0014] Further, the PWM generation module is connected to a plurality of bootstrap boosting modules, and each bootstrap boosting module is connected to an output module.

[0015] The utility model has the advantages that: the utility model discloses a simple circuit structure realizes efficient voltage conversion and isolation output, and the compact circuit structure makes the application more flexible and convenient in the whole power supply system, reduces the complexity and cost of circuit design. In addition, the output module ensures the stability of the output voltage, meets the demand of high-quality power supply of the system. Furthermore, the circuit can realize the demand of multiple sets of isolated power supply and conveniently provide multiple sets of stable isolated voltage. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description, and obviously, the drawing in the following description is only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 It is a circuit architecture schematic diagram of the utility model;

[0018] Figure 2 It is a circuit structure schematic diagram of the utility model;

[0019] Figure 3The key point state voltage state schematic diagram of the circuit of the utility model.

[0020] In the figure, reference numerals 1, input module; 2, PWM generation module; 201, generator; 202, driver; 3, bootstrap voltage boosting module; 4, output module. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples.It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.

[0022] It should be noted that when a component is referred to as "fixed" or "set" or "connected" to another component, it can be directly or indirectly located on the other component.The terms "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc.indicate the orientation or position based on the orientation or position shown in the drawings, and are only for convenience of description, and cannot be understood as limiting the technical solutions.The terms "first", "second", etc.are only used for convenience of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features.The meaning of "multiple" is two or more, unless otherwise specifically limited.The meaning of "several" is one or more, unless otherwise specifically limited.

[0023] As Figure 1 and Figure 2 As shown in the utility model one embodiment of a simple structure auxiliary power supply circuit, including input module 1, input module 1 electrically connected with PWM generation module 2, PWM generation module 2 electrically connected with bootstrap voltage boosting module 3, bootstrap voltage boosting module electrically connected with output module 4, PWM generation module 2 is used to control input module 1 to input boost voltage to bootstrap voltage boosting module 3, bootstrap voltage boosting module 3 is used to incorporate boost voltage to make the boost of self circuit, output module 4 is used to output the stable voltage after boosting.

[0024] PWM generation module 2 is connected with multiple bootstrap voltage boosting modules, and each bootstrap voltage boosting module is connected with an output module 4.

[0025] The input module 1 supplies power to a PWM (pulse width modulation) generation module and provides a boosted voltage to the bootstrap boost module 3. The PWM generation module 2 generates a pulse signal with adjustable width according to a preset control logic or an external signal. The pulse signal is used to control the on-off state of a switching element (such as a MOSFET), thereby realizing control over the boosting process. Specifically, the PWM signal controls the accumulation and release of the input voltage in the bootstrap boost module 3 by adjusting the duty cycle (i.e., the proportion of the high level time in the entire cycle). When the PWM signal is high, the switching element is turned on, and the input module 1 can input the boosted voltage to the bootstrap boost module 3 through the PWM generation module 2, and the bootstrap boost module 3 incorporates the boosted voltage, causing the circuit to boost. When the PWM signal is low, the switching element is turned off. The output module 4 outputs the boosted voltage generated by the bootstrap boost module 3, and the output module 4 is provided with anti-backflow devices and energy storage devices to ensure stable output voltage.

[0026] In this embodiment, efficient voltage conversion and isolated output are realized through a simple circuit structure, and the compact circuit structure makes it more flexible and convenient to apply in the entire power supply system, reducing the complexity and cost of circuit design. In addition, the output module 4 ensures the stability of the output voltage, meeting the demand for high-quality power supply of the system. Furthermore, this circuit can meet the demand for multiple isolated power supply and facilitate the provision of multiple stable isolated voltages.

[0027] As shown in FIGS. Figure 1 and Figure 2 In a preferred example, the PWM generation module 2 includes a generator 201 and a driver 202, the generator 201 is used to input a PWM control signal to the driver 202, and the driver 202 is connected to the input module 1 and the bootstrap boost module 3 to input the boosted voltage to the bootstrap boost module 3.

[0028] The generator 201 is a digital signal processor, a single-chip microcomputer, a PWM chip, or a self-oscillation circuit.

[0029] The driver 202 is a driver chip or a totem pole driving circuit.

[0030] Specifically, the driver chip includes an input pin for inputting the PWM control signal, an output pin for outputting the boosted voltage, a power supply pin connected to the power supply, and a ground pin connected to the ground. The driver chip can be a UCC27524 series, a UCC27424 series, an NSi8220 series, or the like.

[0031] The generator 201 (digital signal processor, single-chip microcomputer, PWM chip or self-oscillating circuit) generates a PWM control signal, i.e. a pulse with high and low levels alternately, according to a preset algorithm or an external input signal. The PWM control signal is transmitted to the input pin of the driver 202 through the output port of the generator 201. After receiving the PWM control signal from the generator 201, the driver 202 (driving chip or totem pole driving circuit) controls the on-off of the internal circuit according to the high and low level states of the signal. When the PWM signal is at a high level, the driver 202 provides a boost voltage to the bootstrap boost module 3 through the output pin, so that the circuit is boosted. When the PWM signal is at a low level, the driver 202 stops providing a boost voltage to the bootstrap boost module 3.

[0032] In this embodiment, the PWM control signal generated by the generator 201 can accurately control the on-off time of the driver 202, so as to realize control of the boost voltage output, fast response speed and high regulation accuracy. The driver 202 adopts a driving chip or totem pole driving circuit, which can provide a stable boost voltage to ensure that the bootstrap boost module 3 can work stably and reliably. The generator 201 can adopt various different implementation manners (such as a digital signal processor, a single-chip microcomputer, a PWM chip or a self-oscillating circuit), and the driver 202 can also select different forms such as a driving chip or a totem pole driving circuit, so that the scheme can be customized and optimized flexibly according to specific application scenarios and requirements.

[0033] As shown in FIG. 1, Figures 1 to 3 In a preferred example, the bootstrap boost module 3 includes a first anti-inrush diode and a first energy storage capacitor. The anode of the first anti-inrush diode is connected to a first network, and the first network is connected to a basic voltage input end. Specifically, the first network is connected to a power supply negative electrode, and the cathode of the first anti-inrush diode is connected to the second end of the first energy storage capacitor and a second network. The second network is used for monitoring voltage change and can not be connected in actual application. The first end of the first energy storage capacitor is connected to the PWM generation module 2.

[0034] When the PWM signal is at a low level, the output pin of the driving chip outputs 0V, and the first network NET1 charges the first energy storage capacitor C1 through the first anti-inrush diode D1. At this time, the voltages of the first network NET1, the second network NET2 and the third network NET3 are equal (ignoring the diode voltage drop).

[0035] When the PWM signal is at a high level, the output pin of the driving chip outputs 12V, and the first network NET no longer charges the first energy storage capacitor C1. The voltage of the second network is increased by 12V

[0036] Since the first anti-inrush diode allows current to flow from the power supply positive electrode to the first energy storage capacitor, but prevents current from flowing back from the first energy storage capacitor to the power supply negative electrode, the voltage is boosted.

[0037] In this embodiment, the boost function is achieved through a simple circuit structure (containing only a first anti-backflow diode and a first energy storage capacitor), reducing the complexity and cost of circuit design.

[0038] like Figures 1 to 3 As shown, in a preferred embodiment, the output module 4 includes a second anti-backflow diode and a second energy storage capacitor. The positive terminal of the second anti-backflow diode is connected to the bootstrap boost module 3, and the negative terminal of the second anti-backflow diode is connected to the first terminal of the second energy storage capacitor and the third network. The third network is connected to the high-voltage output terminal, that is, the boosted voltage is output for auxiliary power supply, and the second terminal of the second energy storage capacitor is connected to the first network.

[0039] In this embodiment, due to the unidirectional conductivity of the diode, current is allowed to flow from the bootstrap module 3 to the second energy storage capacitor and the third network, but reverse current flow is prevented, thereby maintaining voltage stability. Furthermore, since the output module 4 has a relatively simple structure and the connections between components are clear and straightforward, maintenance and debugging are more convenient in practical applications.

[0040] Specific work process

[0041] With NET1 to GND voltage at 48V and VCC voltage at 12V, the operating voltage status at each point is as follows: Figure 3 As shown:

[0042] State 1: PWM is low, and PIN7 of U1 outputs 0V. NET1 charges the bootstrap capacitor C1 through D1. At this time, the voltages of NET1, NET2, and NET3 are equal (ignore diode voltage drop).

[0043] State 2: PWM is high, and PIN7 of U1 outputs 12V. NET2 voltage is the original NET1 + VCC. At this time, NET1 stops charging C1, and the NET2 voltage charges the output capacitor through D2. NET3 voltage is equal to NET2 voltage (ignoring diode voltage drop). The voltage across the output capacitor C2 is equal to NET3 - NET1 voltage VCC.

[0044] The PWM wave period changes, repeating the above two states, resulting in a stable voltage VCC across the output capacitor C2 (ignoring diode voltage drop).

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A simple structure auxiliary power supply circuit characterized by comprising: The application relates to a voltage stabilizing device, which comprises an input module, a PWM generating module, a bootstrap voltage boosting module and an output module.

2. The simple auxiliary power supply circuit as claimed in claim 1, wherein The PWM generating module is used for controlling the input module to input a boosting voltage to the bootstrap voltage boosting module, and the bootstrap voltage boosting module is used for incorporating the boosting voltage to boost the circuit of the bootstrap voltage boosting module.

3. A simple auxiliary power supply circuit as claimed in claim 2, characterized in that The generator is a digital signal processor, a single-chip microcomputer, a PWM chip or a self-oscillation circuit.

4. The simple auxiliary power supply circuit as claimed in claim 2, wherein The driver is a driving chip or a totem pole driving circuit.

5. The simple auxiliary power supply circuit according to claim 4, characterized in that The driving chip comprises an input pin for inputting a PWM control signal, an output pin for outputting a boosting voltage, a power supply pin for connecting a power supply and a ground pin for grounding.

6. The simple auxiliary power supply circuit as defined in claim 1, wherein The bootstrap voltage boosting module comprises a first anti-inrush diode and a first energy storage capacitor.

7. The simple auxiliary power supply circuit as defined in claim 1, wherein The output module comprises a second anti-inrush diode and a second energy storage capacitor.

8. The simple auxiliary power supply circuit as defined in claim 1, wherein The PWM generating module is connected with multiple bootstrap voltage boosting modules, and each bootstrap voltage boosting module is connected with an output module.

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