A switching power supply with a sharp absorption circuit

Abstract

The utility model relates to a kind of switching power supply with sharp peak absorption circuit applied to switching power supply field, including the switching power supply periodicity input sharp peak voltage absorption circuit built-in in switching power supply, TVS7, TVS8, TVS9, TVS10, TVS11, TVS12 are provided in switching power supply periodicity input sharp peak voltage absorption circuit, TVS7, TVS8, TVS9 are connected in series after with TVS10, TVS11, TVS12 circuit parallel after being connected in series, TVS1, TVS2, TVS3 have C1 in series, TVS4, TVS5, TVS6 have C2 in series, in the above switching power supply with sharp peak absorption circuit and can adapt wide input voltage range, the switching power supply of the utility model can long time, stable, reliably work under periodic sharp peak voltage input, and the switching power supply of the utility model can long time, stable, reliably work under lower input voltage in wider input voltage range.

Description

Technical Field

[0001] This utility model relates to a switching power supply, and more particularly to a switching power supply with a spike absorption circuit for use in the field of switching power supplies. Background Technology

[0002] To meet the power supply adaptability requirements of backend equipment, various switching power supplies capable of adapting to different power input requirements have emerged. However, switching power supplies that can effectively absorb periodic input voltage spikes and operate stably for extended periods over a wide input voltage range are relatively few. Currently, existing switching power supplies typically use varistors connected to the input terminal to absorb input voltage spikes; or they use gas discharge tubes to clamp the voltage spikes. Since varistors and gas discharge tubes have limited surge protection lifespans, they are unsuitable for applications with periodic input voltage spikes. Currently, most existing switching power supplies use a single topology, such as flyback or forward topology, making it difficult to achieve a wide input voltage range. To address these shortcomings, this invention provides a switching power supply that can effectively absorb periodic input voltage spikes and operate stably for extended periods over a wide input voltage range.

[0003] Firstly, the switching power supply uses a varistor at the input terminal to absorb and clamp the input voltage spikes. However, varistors have limitations in the number of breakdowns and their lifespan, making them unsuitable for applications with periodic input voltage spikes. Secondly, the switching power supply uses a gas discharge tube at the input terminal to absorb and clamp the input voltage spikes. However, gas discharge tubes also have limitations in the number of breakdowns and their lifespan, making them unsuitable for applications with periodic input voltage spikes. Furthermore, using a single high-capacity transient voltage suppressor diode to absorb spikes is problematic because the capacity of a single transient voltage suppressor diode is limited. Periodic spike energy flowing through a single diode can easily cause it to break down and short-circuit, ultimately leading to the failure of the switching power supply. Finally, the switching power supply uses a single forward topology, which, due to limitations in transformer turns ratio and feedback duty cycle, makes it difficult to achieve a wide input voltage range. Summary of the Invention

[0004] The technical problem that this utility model aims to solve in view of the above-mentioned prior art is that existing switching power supplies cannot withstand periodic peak voltage input for a long time, resulting in power supply damage. Switching power supplies cannot adapt to a wide input voltage range and cannot work under low voltage input.

[0005] To address the aforementioned problems, this utility model provides a switching power supply with a spike absorption circuit, including a periodic input spike voltage absorption circuit built into the switching power supply. The periodic input spike voltage absorption circuit includes a seventh transient capacitor suppression diode (TVS7), an eighth transient capacitor suppression diode (TVS8), a ninth transient capacitor suppression diode (TVS9), a tenth transient capacitor suppression diode (TVS10), an eleventh transient capacitor suppression diode (TVS11), and a twelfth transient capacitor suppression diode (TVS12). The seventh, eighth, and ninth transient capacitor suppression diodes (TVS7, TVS8, and TVS9) are connected in series and then connected to… The circuit consisting of the tenth transient capacitor suppression diode TVS10, the eleventh transient capacitor suppression diode TVS11, and the twelfth transient capacitor suppression diode TVS12 connected in series is connected in parallel. The first transient capacitor suppression diode TVS1, the second transient capacitor suppression diode TVS2, and the third transient capacitor suppression diode TVS3 are connected in series with the first capacitor C1. The fourth transient capacitor suppression diode TVS4, the fifth transient capacitor suppression diode TVS5, and the sixth transient capacitor suppression diode TVS6 are connected in series with the second capacitor C2. The periodic input spike voltage absorption circuit of the switching power supply is connected to a two-stage spike voltage discrimination and absorption circuit. The periodic input spike voltage absorption circuit of the switching power supply also includes a boost circuit.

[0006] Among the aforementioned switching power supplies with spike absorption circuits that can adapt to a wide input voltage range, this switching power supply can operate stably and reliably for a long time under periodic spike voltage input, and it can also operate stably and reliably for a long time under a relatively wide input voltage range and at a lower input voltage.

[0007] As a further improvement of this application, the boost circuit is connected to an inductor L1, a diode D1, and a field-effect transistor Q1, with the other end of the inductor L1 connected to the input of the preamplifier.

[0008] As a further improvement to this application, the other end of diode D1 is connected to the input of the subsequent stage, and the boost circuit and the peak voltage secondary discrimination and absorption circuit are connected to each other in sequence.

[0009] As a further improvement of this application, the periodic input spike voltage absorption circuit of the switching power supply includes a subsequent flyback topology power supply, which is an isolated flyback topology architecture.

[0010] As another improvement of this application, the subsequent flyback topology power supply is interconnected with the boost circuit, and multiple transient voltage suppression diodes are provided at the input terminal of the switching power supply.

[0011] As a further improvement to this application, multiple transient voltage suppression diodes are combined in series and parallel, and a two-stage overvoltage detection circuit is provided at the input of the switching power supply.

[0012] As a further improvement to this application, the two-stage overvoltage discrimination circuit and the peak voltage two-stage discrimination and absorption circuit are connected to each other in sequence, and the boost circuit is a Boost boost circuit.

[0013] In summary, this switching power supply can operate stably and reliably for extended periods under periodic peak voltage input. Furthermore, it can operate stably and reliably for extended periods at relatively low input voltages within a wide input voltage range. It employs multiple TVS diodes connected in series and parallel to reduce the power consumption of individual TVS diodes, thereby improving their reliability and stability. A boost circuit is also included to first boost the low input voltage, enabling the power supply to adapt to low-voltage input ranges and broaden its operating voltage range. Moreover, the power supply's subsequent stage utilizes an isolated flyback power supply topology and a rationally designed transformer turns ratio, which effectively accommodates a wide input voltage range. Attached Figure Description

[0014] Figure 1 This is a diagram of the input spike voltage absorption circuit for this application; Figure 2 This is a circuit diagram of the two-stage peak voltage discrimination and absorption circuit of this application; Figure 3 This is a diagram of the pre-amplifier boost control circuit for this application; Figure 4 This is a circuit diagram of the subsequent isolated flyback control stage of this application; Figure 5 This is a partial circuit diagram on the left side of the overall circuit schematic of the switching power supply in this application. Figure 6 The diagram shows a partial circuit diagram on the right side of the overall circuit schematic of the switching power supply in this application. Detailed Implementation

[0015] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0016] First implementation method: Figures 1-6This paper illustrates a switching power supply with a spike absorption circuit, including a periodic input spike voltage absorption circuit built into the switching power supply. The periodic input spike voltage absorption circuit includes a seventh transient capacitor suppression diode (TVS7), an eighth transient capacitor suppression diode (TVS8), a ninth transient capacitor suppression diode (TVS9), a tenth transient capacitor suppression diode (TVS10), an eleventh transient capacitor suppression diode (TVS11), and a twelfth transient capacitor suppression diode (TVS12). The seventh, eighth, and ninth transient capacitor suppression diodes (TVS7, TVS8, and TVS9) are connected in series with the tenth transient capacitor suppression diode. The circuit consisting of the series-connected transient capacitor suppression diodes TVS10, TVS11, and TVS12 is connected in parallel. The first transient capacitor suppression diodes TVS1, TVS2, and TVS3 are connected in series with the first capacitor C1. The fourth transient capacitor suppression diodes TVS4, TVS5, and TVS6 are connected in series with the second capacitor C2. The periodic input spike voltage absorption circuit of the switching power supply is connected to a two-stage spike voltage discrimination and absorption circuit. The periodic input spike voltage absorption circuit of the switching power supply also includes a boost circuit.

[0017] Figures 1-6 The diagram shows a boost circuit with inductor L1, diode D1, and MOSFET Q1 connected together. The other end of inductor L1 is connected to the input of the pre-amplifier, and the other end of diode D1 is connected to the input of the post-amplifier. The boost circuit is sequentially connected to the peak voltage discrimination and absorption circuit. The periodic input peak voltage absorption circuit of the switching power supply includes a post-amplifier flyback topology, which is an isolated flyback topology. The post-amplifier flyback topology is connected to the boost circuit. The input of the switching power supply has multiple transient voltage suppression diodes connected in series and parallel. The input of the switching power supply has a two-stage overvoltage discrimination circuit, which is sequentially connected to the peak voltage discrimination and absorption circuit. The boost circuit is a Boost boost circuit.

[0018] Figures 1-6This switching power supply uses a semiconductor transient voltage suppressor diode (TVS diode) at its input. Compared to varistors and gas discharge tubes, this device has no limitations on the number of breakdown cycles or lifespan, and it has a fast response speed. By appropriately selecting the current-carrying capacity of the TVS diode based on the amplitude and duration of the input peak voltage, reliable, stable, and long-term operation can be ensured. Furthermore, this switching power supply uses multiple transient voltage suppressor diodes in a series and parallel combination in the circuit, employing series voltage division and parallel current division to accommodate higher energy input peak voltages, achieving more efficient absorption of periodic input peak voltages. Moreover, this switching power supply can effectively distinguish the amplitude of the input peak voltage; if the clamping voltage of the preceding stage TVS diode is too high, exceeding the peak amplitude discrimination of the subsequent stage, it will be detected. When the circuit is in operation, the spike absorption circuit is activated to bypass and absorb the spike energy, thus protecting the subsequent circuits from damage. Secondly, in order to adapt to lower input voltages, this switching power supply adopts a two-stage topology. The front stage uses a boost topology to boost the low input voltage to a suitable value, thereby widening the input voltage range of the switching power supply. The rear stage of this switching power supply uses an isolated flyback power supply topology. By reasonably selecting the transformer turns ratio, the flyback topology can achieve both a lower output voltage and a higher output voltage than the input voltage, thereby widening the input voltage range.

[0019] Figures 1-6This diagram shows the seventh transient capacitor suppression diode (TVS7), the eighth transient capacitor suppression diode (TVS8), and the ninth transient capacitor suppression diode (TVS9) in the periodic input spike voltage absorption circuit of the switching power supply in this scheme. These diodes are connected in series, then in parallel with the tenth transient capacitor suppression diode (TVS10), the eleventh transient capacitor suppression diode (TVS11), and the twelfth transient capacitor suppression diode (TVS12). The first transient capacitor suppression diode (TVS1), the second transient capacitor suppression diode (TVS2), the third transient capacitor suppression diode (TVS3), and the first capacitor (C1) are connected in series. The fourth transient capacitor suppression diode (TVS4), the fifth transient capacitor suppression diode (TVS5), and the sixth transient capacitor suppression diode (TVS6) are connected in series, then in parallel with the second capacitor (C2). By using a series and parallel combination of multiple transient voltage suppressor diodes (TVS diodes), effective absorption of input peak voltages is achieved. The peak voltage secondary discrimination and absorption circuit rationally selects the discrimination threshold voltage and thyristor based on the amplitude and pulse width of the secondary peak, effectively bypassing and absorbing the secondary peak. When the clamping voltage of the preceding TVS diode is too high, exceeding the peak amplitude discrimination circuit of the subsequent stage, the peak absorption circuit activates, bypassing and absorbing the peak energy to protect the subsequent circuit from damage. In the subsequent boost circuit, inductor L1, diode D1, and MOSFET Q1 are connected at one end, with the other end of inductor L1 connected to the preceding stage input and the other end of diode D1 connected to the following stage input. The preceding stage uses a boost topology; when the input voltage is below a certain value, the boost circuit... The boost circuit starts working, boosting the low input voltage to a certain value to meet the requirements of low input voltage applications and widen the input voltage range of the switching power supply. The subsequent stage of the flyback topology power supply uses an isolated flyback topology architecture. Through reasonable transformer turns ratio design, this topology can adapt well to a wide input voltage range, achieving both output voltage lower than and higher than the input voltage. The input of this switching power supply uses multiple TVS diodes connected in series. Compared to using a single TVS diode with a large capacitance and high breakdown voltage, its breakdown voltage can be selected to be relatively lower. According to the formula P=VBR*IPP, when Ipp is constant, the lower the clamping voltage VBR, the lower the power loss, and the more stable and reliable the operation. The input stage uses multiple TVS diodes connected in parallel. Compared to using a single large-capacity TVS diode, multiple TVS diodes connected in parallel can perform current shunting. Similarly, according to the formula P=VBR*IPP, when VBR is constant, the smaller Ipp is, the lower the power loss, the easier it is to break down, and the more stable and reliable the operation. A spike absorption circuit is added to the input to identify secondary voltage spikes. If the clamping voltage of the preceding TVS diode is too high, exceeding the set threshold voltage, this circuit activates, driving the thyristor to conduct and short-circuiting the secondary input spike. Power is dissipated on the thyristor, protecting the subsequent circuitry from damage and improving operational reliability and stability. A boost circuit is added to the preceding stage. When the input voltage is below a certain value, the boost circuit starts working, boosting the low input voltage to a certain value.To meet the needs of low-voltage input applications and broaden the input voltage range of the switching power supply, a flyback circuit topology is adopted in the subsequent stage. Through proper selection of the transformer turns ratio, it can effectively adapt to a wide input voltage range.

[0020] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A switching power supply with a spike absorption circuit, characterized in that: This includes a periodic input spike voltage absorption circuit for a switching power supply, which is built into the switching power supply. The periodic input spike voltage absorption circuit includes a first transient capacitor suppression diode (TVS1), a second transient capacitor suppression diode (TVS2), a third transient capacitor suppression diode (TVS3), a fourth transient capacitor suppression diode (TVS4), a fifth transient capacitor suppression diode (TVS5), a sixth transient capacitor suppression diode (TVS6), a seventh transient capacitor suppression diode (TVS7), an eighth transient capacitor suppression diode (TVS8), a ninth transient capacitor suppression diode (TVS9), a tenth transient capacitor suppression diode (TVS10), an eleventh transient capacitor suppression diode (TVS11), and a twelfth transient capacitor suppression diode (TVS12). The circuit consisting of transient capacitor suppression diodes TVS8 and TVS9 connected in series, and TVS10, TVS11, and TVS12 connected in series, is connected in parallel. The first transient capacitor suppression diode TVS1, TVS2, and TVS3 are connected in series with a first capacitor C1. The fourth transient capacitor suppression diode TVS4, TVS5, and TVS6 are connected in series with a second capacitor C2. The periodic input spike voltage absorption circuit of the switching power supply is connected to a two-stage spike voltage discrimination and absorption circuit. The periodic input spike voltage absorption circuit of the switching power supply also includes a boost circuit.

2. A switching power supply with a spike absorption circuit according to claim 1, characterized in that: The boost circuit is connected to an inductor L1, a diode D1, and a field-effect transistor Q1. The other end of the inductor L1 is connected to the input of the preamplifier.

3. A switching power supply with a spike absorption circuit according to claim 2, characterized in that: The other end of the diode D1 is connected to the input of the subsequent stage, and the boost circuit and the peak voltage secondary discrimination and absorption circuit are connected to each other in sequence.

4. A switching power supply with a spike absorption circuit according to claim 1, characterized in that: The periodic input spike voltage absorption circuit of the switching power supply includes a subsequent flyback topology power supply, which is an isolated flyback topology architecture.

5. A switching power supply with a spike absorption circuit according to claim 4, characterized in that: The subsequent flyback topology power supply is interconnected with the boost circuit, and the input terminal of the switching power supply is equipped with multiple transient voltage suppression diodes.

6. A switching power supply with a spike absorption circuit according to claim 5, characterized in that: The multiple transient voltage suppression diodes are connected in series and parallel, and the input terminal of the switching power supply is equipped with a two-stage overvoltage detection circuit.

7. A switching power supply with a spike absorption circuit according to claim 6, characterized in that: The secondary overvoltage discrimination circuit and the secondary peak voltage discrimination and absorption circuit are connected to each other in sequence, and the boost circuit is a boost circuit.

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