CN215420100U - Auxiliary power supply with DC1500V input - Google Patents
Auxiliary power supply with DC1500V input Download PDFInfo
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- CN215420100U CN215420100U CN202121717111.6U CN202121717111U CN215420100U CN 215420100 U CN215420100 U CN 215420100U CN 202121717111 U CN202121717111 U CN 202121717111U CN 215420100 U CN215420100 U CN 215420100U
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Abstract
The utility model discloses an auxiliary power supply with DC1500V input, which comprises a two-stage flyback circuit, a first diode D1 and a second diode D2, wherein the positive and negative input poles of the front-stage flyback circuit are connected with the positive and negative poles of the power supply of a contact network, and the positive and negative output poles of the rear-stage flyback circuit are used as the positive and negative poles of the power supply of a DC 24V; the input anode of the rear flyback circuit is connected with the output anode of the front flyback circuit through a first diode D1 and is connected with the power supply anode of the storage battery through a second diode D2, the input cathode of the rear flyback circuit is connected with the output cathode of the front flyback circuit and the power supply cathode of the storage battery, and the first diode D1 and the second diode D2 are both connected with the input anode of the rear flyback circuit through cathodes. The auxiliary power supply with DC1500V input has the advantages of simple structure, convenient use, high power supply working efficiency, high power supply reliability and the like.
Description
Technical Field
The utility model relates to the technical field of auxiliary power supplies of railway vehicles, in particular to an auxiliary power supply with DC1500V input.
Background
The rail vehicle has two power supply modes, wherein one mode is that a contact net with rated voltage of DC1500V supplies power, and the other mode is that a storage battery with rated voltage of DC110V supplies power. While the auxiliary power required for power products on vehicles is typically DC 24V. DC1500V or DC110V needs to be converted to DC 24V.
The traditional approach is to convert DC1500V directly to DC24V through a flyback converter circuit. But the power of the auxiliary power supply is relatively small and generally does not exceed 10W. The power device of the auxiliary power supply is generally a MOS transistor. When the rated voltage of the input power supply is DC1500V and the output is DC24V, two power devices with the rated voltage of more than DC1700V are required to be used in series. Taking MOS (metal oxide semiconductor) tubes with rated voltage of DC1700V, rated current of 3A and model of WPH4003 produced by Essenmei as an example, the internal resistance of the MOS tubes is 10.5 ohms, and the MOS tubes can seriously generate heat to cause low working efficiency of a power supply when the MOS tubes work for a long time under the condition; and the MOS transistor is easily damaged, resulting in low power reliability.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide the auxiliary power supply with the DC1500V input, which has the advantages of simple structure, convenient use, high power supply working efficiency and high power supply reliability.
In order to solve the technical problems, the technical scheme provided by the utility model is as follows:
an auxiliary power supply with DC1500V input comprises a two-stage flyback circuit, a first diode D1 and a second diode D2, wherein the positive and negative input poles of a front stage flyback circuit are connected with the positive and negative poles of a power supply system, and the positive and negative output poles of a rear stage flyback circuit are used as the positive and negative poles of a DC24V power supply; the input anode of the rear flyback circuit is connected with the output anode of the front flyback circuit through a first diode D1 and is connected with the power supply anode of the storage battery through a second diode D2, the input cathode of the rear flyback circuit is connected with the output cathode of the front flyback circuit and the power supply cathode of the storage battery, and the first diode D1 and the second diode D2 are both connected with the input anode of the rear flyback circuit through cathodes.
As a further improvement of the above technical solution:
the feed voltage of the storage battery is 85V, and the output voltage of the front stage flyback circuit is 80V.
The flyback circuit comprises a soft start circuit, a current type control circuit, a control chip and a flyback transformer, wherein the control chip and the flyback transformer are used for regulating and outputting narrow-to-wide PWM waves through the soft start circuit and the current type control circuit until output voltage meets requirements, the control chip is connected to a main winding and a power tube which are connected with the flyback transformer in series in parallel through a first resistor R1 and a second resistor R2, the flyback transformer comprises two auxiliary windings, one auxiliary winding outputs an auxiliary power supply of the control chip, and the output of the other auxiliary winding is used as the positive and negative output poles of the flyback circuit.
One end of the secondary winding is connected with a diode, and the secondary winding and two ends of the diode are connected with another diode and a capacitor in parallel.
Compared with the prior art, the utility model has the advantages that:
the auxiliary power supply input by the DC1500V comprises a two-stage flyback circuit, a first diode D1 and a second diode D2, wherein the input positive pole and the input negative pole of a front-stage flyback circuit are connected with the power supply positive pole and the power supply negative pole of a contact net with the voltage of DC1500V, the output positive pole and the output negative pole of a rear-stage flyback circuit are used as the power supply positive pole and the power supply negative pole of DC24V, and the auxiliary power supply is provided for power supply products of rail vehicles. The input anode of the back flyback circuit is connected with the output anode of the front flyback circuit through a first diode D1 and is connected with the power supply anode of the storage battery through a second diode D2, the input cathode of the back flyback circuit is connected with the output cathode of the front flyback circuit and the power supply cathode of the storage battery, and the first diode D1 and the second diode D2 are both connected with the input anode of the back flyback circuit through cathodes.
In the circuit structure formed by the two-stage flyback circuit, the front stage flyback circuit outputs the power supply of a contact network of DC1500V to set voltage for power supply. When the voltage of the storage battery is higher than the set voltage, the front flyback circuit stops working, and the rear flyback circuit is powered by the storage battery; when the voltage of the storage battery is lower than the set voltage, the back stage flyback circuit is powered by the output of the front stage flyback circuit. Therefore, the front-stage circuit of the auxiliary power supply input by the DC1500V of the utility model can not be in a long-term working state, thereby reducing the heat generation of MOS tubes and improving the working efficiency and the reliability of the auxiliary power supply through simple structural arrangement.
Drawings
FIG. 1 is a circuit schematic of an auxiliary power supply for a DC1500V input of the present invention;
fig. 2 is a schematic diagram of a flyback circuit in an auxiliary power supply with DC1500V input according to the present invention.
Detailed Description
In order to facilitate understanding of the utility model, the utility model will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the utility model is not limited to the specific embodiments below.
Example (b):
as shown in fig. 1, the auxiliary power supply input by the DC1500V of the present embodiment includes a two-stage flyback circuit, a first diode D1 and a second diode D2, wherein the positive and negative input poles of the front stage flyback circuit are connected to the positive and negative input poles of the overhead line system, and the positive and negative output poles of the rear stage flyback circuit are used as the positive and negative output poles of the DC 24V; the input anode of the back flyback circuit is connected with the output anode of the front flyback circuit through a first diode D1 and is connected with the power supply anode of the storage battery through a second diode D2, the input cathode of the back flyback circuit is connected with the output cathode of the front flyback circuit and the power supply cathode of the storage battery, and the first diode D1 and the second diode D2 are both connected with the input anode of the back flyback circuit through cathodes.
In the circuit structure formed by the two-stage flyback circuit in this embodiment, the pre-flyback circuit outputs the power supply of the overhead line system of DC1500V as the set voltage power supply. When the voltage of the storage battery is higher than the set voltage, the front flyback circuit stops working, and the rear flyback circuit is powered by the storage battery; when the voltage of the storage battery is lower than the set voltage, the back stage flyback circuit is powered by the output of the front stage flyback circuit. Therefore, the front-stage circuit of the auxiliary power supply input by the DC1500V of the present embodiment is not in a long-term operation state, thereby reducing the heat generation of the MOS transistor, and improving the operation efficiency and reliability of the auxiliary power supply by a simple configuration.
In this embodiment, the feeding voltage of the storage battery is 85V, and the set output voltage of the pre-stage flyback circuit is 80V. When the voltage of the storage battery is higher than DC80V, the front flyback circuit stops working, and the rear flyback circuit is powered by the storage battery; when the battery voltage is lower than DC80V, the back stage flyback circuit is powered by the output of the front stage flyback circuit. In a vehicle system, the battery feeding voltage is DC85V, when the battery is fed, the charger will work immediately to charge the battery, and the front-stage circuit is ensured not to be in a long-term working state.
In this embodiment, as shown in fig. 2, the flyback circuit includes a soft start circuit, a current mode control circuit, a control chip and a flyback transformer, where the control chip adjusts and outputs a narrow-to-wide PWM wave through the soft start circuit and the current mode control circuit until an output voltage meets a requirement, the control chip is connected in parallel to a main winding and a power tube connected in series to the flyback transformer through a first resistor R1 and a second resistor R2, the flyback transformer includes two secondary windings, one secondary winding outputs an auxiliary power supply of the control chip, and an output of the other secondary winding is used as an output positive electrode and a negative electrode of the flyback circuit. One end of the secondary winding is connected with a diode, and the secondary winding and two ends of the diode are connected with another diode and a capacitor in parallel. The flyback circuit connection structure and the control mode of the present embodiment are conventional schemes, and are not described herein.
An input power supply of the flyback circuit powers on the control chip through the first resistor R1, and after the control chip is powered on, the PWM wave from narrow to wide is finally output through the regulation of the soft start circuit and the current mode control circuit until the output voltage meets the requirement. The output pulse width of the control chip is adjusted through the current mode control circuit, so that the output voltage is constant and given at the output. When the output is larger than the given output, the output of the current mode control circuit is reduced, so that the output pulse width of the control chip is reduced; on the contrary, when the output is smaller than the given output, the output of the current mode control circuit is increased, so that the output pulse width of the control chip is increased.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-described embodiments. It should be apparent to those skilled in the art that modifications and variations can be made without departing from the technical spirit of the present invention.
Claims (4)
1. An auxiliary power supply for a DC1500V input, comprising: the direct current power supply circuit comprises two stages of flyback circuits, a first diode D1 and a second diode D2, wherein the input positive pole and the input negative pole of the front stage flyback circuit are connected with the positive pole and the negative pole of the power supply of a contact network, and the output positive pole and the output negative pole of the rear stage flyback circuit are used as the positive pole and the negative pole of the DC24V power supply; the input anode of the rear flyback circuit is connected with the output anode of the front flyback circuit through a first diode D1 and is connected with the power supply anode of the storage battery through a second diode D2, the input cathode of the rear flyback circuit is connected with the output cathode of the front flyback circuit and the power supply cathode of the storage battery, and the first diode D1 and the second diode D2 are both connected with the input anode of the rear flyback circuit through cathodes.
2. An auxiliary power supply for a DC1500V input according to claim 1, wherein: the feed voltage of the storage battery is 85V, and the output voltage of the front stage flyback circuit is 80V.
3. An auxiliary power supply for a DC1500V input according to claim 1, wherein: the flyback circuit comprises a soft start circuit, a current type control circuit, a control chip and a flyback transformer, wherein the control chip and the flyback transformer are used for regulating and outputting narrow-to-wide PWM waves through the soft start circuit and the current type control circuit until output voltage meets requirements, the control chip is connected to a main winding and a power tube which are connected with the flyback transformer in series in parallel through a first resistor R1 and a second resistor R2, the flyback transformer comprises two auxiliary windings, one auxiliary winding outputs an auxiliary power supply of the control chip, and the output of the other auxiliary winding is used as the positive and negative output poles of the flyback circuit.
4. An auxiliary power supply for a DC1500V input according to claim 3, wherein: one end of the secondary winding is connected with a diode, and the secondary winding and two ends of the diode are connected with another diode and a capacitor in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121717111.6U CN215420100U (en) | 2021-07-27 | 2021-07-27 | Auxiliary power supply with DC1500V input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121717111.6U CN215420100U (en) | 2021-07-27 | 2021-07-27 | Auxiliary power supply with DC1500V input |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215420100U true CN215420100U (en) | 2022-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121717111.6U Active CN215420100U (en) | 2021-07-27 | 2021-07-27 | Auxiliary power supply with DC1500V input |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215420100U (en) |
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2021
- 2021-07-27 CN CN202121717111.6U patent/CN215420100U/en active Active
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