CN216312960U - Ultra-wide input voltage switching power supply - Google Patents
Ultra-wide input voltage switching power supply Download PDFInfo
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- CN216312960U CN216312960U CN202120852734.8U CN202120852734U CN216312960U CN 216312960 U CN216312960 U CN 216312960U CN 202120852734 U CN202120852734 U CN 202120852734U CN 216312960 U CN216312960 U CN 216312960U
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Abstract
The utility model relates to an ultra-wide input voltage switching power supply, which consists of a diode D2, a starting circuit, a chip, a duty ratio limiting circuit, a harmonic compensation circuit, an MOS (metal oxide semiconductor) tube, a transformer and a rectification filter circuit, wherein a constant current source consisting of two resistors and two triodes is used for replacing the combination of a traditional power supply starting resistor and a transformer using the ratio of 1:1, so that the switching power supply has an ultra-wide input voltage range, and can still stably work when the input voltage is lower than the output voltage.
Description
Technical Field
The utility model belongs to the technical field of voltage switching power supplies, and particularly relates to an ultra-wide input voltage switching power supply.
Background
In a traditional low-power switching power supply, a resistance starting mode is generally adopted, and the defect that the input voltage cannot be in a wider range is overcome. If the starting resistance value is taken according to low-voltage input during design, the starting resistance bears huge power consumption during high-voltage input, if the starting resistance value is taken according to high-voltage input, a power supply cannot be started due to insufficient starting current during low-voltage input, otherwise, a starting resistance with high power is selected, so that the power supply efficiency is reduced, and the power supply volume and cost are increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems and provide an ultra-wide input voltage switching power supply which is composed of conventional elements, supports a high-low voltage difference range at least 10 times and allows the input voltage to be lower than the output voltage.
In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides an ultra-wide type input voltage switching power supply, includes diode D2, starting circuit, chip, duty cycle limit circuit, harmonic compensation circuit, MOS pipe Q5, transformer T1 and rectification filter circuit, diode D2 is connected with electric capacity C1 and constitutes the direct current bus, starting circuit comprises triode Q1, triode Q2, resistance R2, resistance R4, duty cycle limit circuit comprises resistance R8, resistance R11 and triode Q4, harmonic compensation circuit comprises triode Q3 and resistance R12, rectification filter circuit comprises diode D1 and electric capacity C3.
Further: the model of the chip adopts a UC2843 chip;
further: the direct-current bus supplies power for two loops, the first loop charges a capacitor C5 for the direct-current bus voltage through a starting circuit, and the second loop connects the direct-current bus voltage to the ground through a transformer T1 and an MOS (metal oxide semiconductor) transistor Q5;
further: the combination of a constant current source consisting of the triode Q1, the triode Q2, the resistor R2 and the resistor R4 and a transformer using the ratio of 1:1 enables the switch power supply to have an ultra-wide input voltage range;
further: the voltage switching power supply allows the input voltage to be lower than the output voltage.
Compared with the prior art, the utility model has the beneficial effects that:
a switch power supply with ultra-wide input voltage is composed of diode D2, start circuit, chip, duty ratio limit circuit, harmonic compensation circuit, MOS transistor Q5, transformer T1 and rectification filter circuit, and the switch power supply has ultra-wide input voltage range and can still work stably when input voltage is lower than output voltage by using the combination of two resistors and two triodes to form constant current source instead of traditional power supply start resistor and 1:1 transformer.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings needed to be used in the description of the embodiment will be briefly introduced below, it is obvious that the drawings in the following description are only for more clearly illustrating the embodiment of the present invention or the technical solution in the prior art, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood and implemented by those skilled in the art, the present invention is further described with reference to the following specific examples, which are provided for illustration only and are not intended to limit the present invention.
The ultra-wide input voltage switching power supply comprises a diode D2, a starting circuit, a chip, a duty ratio limiting circuit, a harmonic compensation circuit, a MOS tube Q5, a transformer T1 and a rectification filter circuit, wherein the diode D2 is connected with a capacitor C1 to form a direct current bus, the starting circuit comprises a triode Q1, a triode Q2, a resistor R2 and a resistor R4, the duty ratio limiting circuit comprises a resistor R8, a resistor R11 and a triode Q4, the harmonic compensation circuit comprises a triode Q3 and a resistor R12, and the rectification filter circuit comprises a diode D1 and a capacitor C3.
The model of the chip adopts a UC2843 chip;
the direct-current bus supplies power for two loops, the first loop charges a capacitor C5 for the direct-current bus voltage through a starting circuit, and the second loop connects the direct-current bus voltage to the ground through a transformer T1 and an MOS (metal oxide semiconductor) transistor Q5;
the combination of a constant current source consisting of the triode Q1, the triode Q2, the resistor R2 and the resistor R4 and a transformer using the ratio of 1:1 enables the switch power supply to have an ultra-wide input voltage range;
the voltage switching power supply allows the input voltage to be lower than the output voltage;
the voltage switch power supply consists of conventional elements and can be used in occasions with wider power supply voltage requirements or extremely unstable power supply voltage requirements.
The utility model relates to an ultra-wide input voltage switching power supply, when the power supply is powered on, a direct current voltage reaches a direct current bus through a diode D2 and a resistor R1, the direct current bus is divided into two paths, one path is the direct current bus voltage, the capacitor C5 is charged through a starting circuit consisting of a triode Q1, a triode Q2, a resistor R2 and a resistor R4, when the charging voltage reaches the opening voltage of UC2843 of U101, the U101 starts to work, 6 pins output PWM waves to drive an MOS tube Q5, the other path of direct current bus voltage is chopped by an MOS tube Q5 to the primary side of a transformer T1, is connected to a rectifying and filtering circuit consisting of a diode D1 and a capacitor C3 after passing through the transformer T1, required direct current voltage is output after rectifying and filtering, the direct current voltage is divided into three paths, one path continuously supplies power to the U101 through a diode D4 to finish the whole starting process, and the other path adjusts the duty ratio through a feedback network to maintain the stability of the output voltage, the last path can be used for load power supply.
The details of the present invention not described in detail are prior art.
The foregoing is only a preferred embodiment of the present invention and is not limited to the description and implementation. All equivalent changes or modifications of the structure, features and principles described in the claims of the present invention should be included in the scope of the present invention.
Claims (5)
1. The utility model provides an ultra-wide type input voltage switching power supply, includes diode D2, starting circuit, chip, duty cycle limiting circuit, harmonic compensation circuit, MOS pipe Q5, transformer T1 and rectification filter circuit, its characterized in that: diode D2 is connected with electric capacity C1 and constitutes the direct current generating line, the start circuit comprises triode Q1, triode Q2, resistance R2, resistance R4, the duty cycle restriction circuit comprises resistance R8, resistance R11 and triode Q4, the harmonic compensation circuit comprises triode Q3 and resistance R12, the rectification filter circuit comprises diode D1 and electric capacity C3.
2. An ultra-wide input voltage switching power supply, as recited in claim 1, wherein: the model of the chip adopts a UC2843 chip.
3. An ultra-wide input voltage switching power supply, as recited in claim 1, wherein: the direct current bus supplies power for two loops, the first loop charges a capacitor C5 for direct current bus voltage through a starting circuit, and the second loop connects the direct current bus voltage to the ground through a transformer T1 and an MOS transistor Q5.
4. An ultra-wide input voltage switching power supply, as recited in claim 1, wherein: the combination of a constant current source consisting of the triode Q1, the triode Q2, the resistor R2 and the resistor R4 and a transformer using the ratio of 1:1 enables the switch power supply to have an ultra-wide input voltage range.
5. An ultra-wide input voltage switching power supply, as recited in claim 1, wherein: the voltage switching power supply allows the input voltage to be lower than the output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120852734.8U CN216312960U (en) | 2021-04-25 | 2021-04-25 | Ultra-wide input voltage switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120852734.8U CN216312960U (en) | 2021-04-25 | 2021-04-25 | Ultra-wide input voltage switching power supply |
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| Publication Number | Publication Date |
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| CN216312960U true CN216312960U (en) | 2022-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120852734.8U Active CN216312960U (en) | 2021-04-25 | 2021-04-25 | Ultra-wide input voltage switching power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116232038A (en) * | 2023-03-07 | 2023-06-06 | 上海空间电源研究所 | A wide-input high-reliability start-up power supply circuit for aerospace |
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2021
- 2021-04-25 CN CN202120852734.8U patent/CN216312960U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116232038A (en) * | 2023-03-07 | 2023-06-06 | 上海空间电源研究所 | A wide-input high-reliability start-up power supply circuit for aerospace |
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