CN206524761U - A kind of high pressure wide scope buck converter - Google Patents
A kind of high pressure wide scope buck converter Download PDFInfo
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- CN206524761U CN206524761U CN201720253249.2U CN201720253249U CN206524761U CN 206524761 U CN206524761 U CN 206524761U CN 201720253249 U CN201720253249 U CN 201720253249U CN 206524761 U CN206524761 U CN 206524761U
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Abstract
The utility model provides a kind of high pressure wide scope buck converter, including input EMI filter circuit, buck DC/DC translation circuits, drive circuit and detection control circuit.Direct current input exports galvanic current pressure through inputting EMI filter circuit by buck DC/DC translation circuits；Detection control circuit is according to the potential difference between the voltage feedback signal and reference voltage signal provided by buck DC/DC translation circuits, and power switch pipe upward peak current signal, output pulse width follows the pwm pulse control signal that the potential difference and peak point current change to drive circuit；Drive circuit isolated, amplify after power switch pipe in control buck DC/DC translation circuits so that VD is stable.The input voltage range of power supply described in the utility model is DC350 640V, and rated output power 1700W, volume is 180mm × 100mm × 70mm, meets miniaturization, Modular Trends.
Description
Technical field
The utility model belongs to power technique fields, and in particular to a kind of high pressure wide scope buck converter.
Background technology
With the development and the progress of technology of production, navigated as the Technics of Power Electronic Conversion device of energy conversion links in aviation
My god, ship and future auto industry in be applied widely.
The electrifing degree of modern ships and bullet train is very high, and power consumption is very big, and the fundamental power supply in ship is probably
Diesel generating set or three-phase 50Hz or the 60Hz AC power of steam turbine generation unit output, it is also possible to 220V (voltages
Amplitude 175-320V) or 440V (voltage amplitude 350-640V) batteries；The onboard power system of high-speed maglev train is also used
440V batteries.Compared with other application field, these above-mentioned application requirement Technics of Power Electronic Conversion devices have higher electricity
Pressure, bigger power capacity and smaller weight, volume.
The content of the invention
The purpose of this utility model is exactly part in order to overcome the above-mentioned deficiencies of the prior art, and provides a kind of high pressure wide model
Enclose buck converter.Its input voltage range be DC350-640V, rated output power 1700W, volume be 180mm ×
100mm×70mm.Under declared working condition, operating efficiency is more than 90%.The utility model improves the operating efficiency of converter, reduces
Converter volume, minimizes the converter of high input voltage, modularization.
The purpose of this utility model is achieved by the following technical measures：A kind of high pressure wide scope buck converter,
Including input EMI filter circuit, buck DC/DC translation circuits, drive circuit and detection control circuit.Direct current input is through input
EMI filter circuit, galvanic current pressure is exported by buck DC/DC translation circuits；Detection control circuit is according to by buck
Potential difference between voltage feedback signal and reference voltage signal that DC/DC translation circuits are provided, and power switch pipe superiors
It is worth current signal, output pulse width follows the pwm pulse control signal that the potential difference and peak point current change to drive circuit；Drive
Dynamic circuit isolated, amplify after control power switch pipe in buck DC/DC translation circuits so that VD
It is stable.
In the above-mentioned technical solutions, input EMI filter circuit is by filter capacitor, the element composition such as common mode inductance.
In the above-mentioned technical solutions, buck DC/DC translation circuits are by a power switch pipe and a fly-wheel diode
Constitute Buck converters.When power switch pipe is turned on, filter inductance and filter capacitor carry out electrical power storage, when power switch pipe is closed
When disconnected, fly-wheel diode conducting, rectified filtering obtains output voltage.But the shadow of the presence and other distributed constants due to inductance
Ring, power switch pipe can produce very big peak voltage in shutdown moment, to ensure the normal work of power switch pipe, in power
Switching tube two ends increase RCD absorbing circuits suppress to peak voltage.
In the above-mentioned technical solutions, detection control electric circuit inspection voltage feedback signal and power switch pipe upward peak electric current letter
Number, wherein voltage feedback signal is compared with reference voltage signal and a DC quantity, the DC quantity is exported after error amplifier
It is compared with the peak point current of power switch pipe, adjusts the pulsewidth of pwm pulse control signal.
In the above-mentioned technical solutions, drive circuit is driven using gate-drive transformer, coupled capacitor and clamp diode
High-side power switch pipe in dynamic buck DC/DC translation circuits.
The utility model is simple in construction, perfect in shape and function, compared with prior art with advantages below：
1) input voltage range is DC350-640V, had both been useful in using the VD of primary power source and has been used as input
Occasion, is also applied for the occasion powered with 440V batteries (voltage amplitude 350-640V).
2) output voltage precision：≤ ± 1%.
3) the beneficial effects of the utility model are the efficiency for improving converter, and operating efficiency is more than 90%.
4) volume is 180mm × 100mm × 70mm, meets miniaturization, Modular Trends.
Brief description of the drawings
Fig. 1 is a kind of integrated circuit theory diagram of high pressure wide scope buck converter of the utility model.
Fig. 2 is input EMI filter circuit schematic diagram in the utility model embodiment.
Fig. 3 is buck DC/DC translation circuit topological diagrams in the utility model embodiment.
Fig. 4 is driver circuit schematic diagram in the utility model embodiment.
Fig. 5 is detection control schematic block circuit diagram in the utility model embodiment.
Embodiment
The utility model will be further described below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of high pressure wide scope buck converter, including input EMI filter circuit, buck DC/DC become
Change circuit, drive circuit and detection control circuit.Direct current input is through inputting EMI filter circuit, by buck DC/DC translation circuits
Export galvanic current pressure；Detection control circuit according to the voltage feedback signal that is provided by buck DC/DC translation circuits and
Potential difference between reference voltage signal, and power switch pipe upward peak current signal, output pulse width follow the potential difference
The pwm pulse control signal changed with peak point current is to drive circuit；Drive circuit isolated, amplify after control buck
Power switch pipe in DC/DC translation circuits, so that VD is stable.
As shown in Fig. 2 the input EMI filter circuit.Common mode inductance L0, filter capacitor C1~C4 and bleed off resistance R1,
R2 constitutes electromagnetic interface filter.
As shown in figure 3, the buck DC/DC translation circuits, using Buck converter topologies, wherein VT1 opens for power
Guan Guan, D1 are fly-wheel diode, and CT1 is current transformer, and C5~C8 is filter capacitor.L1 is filter inductance, comprising two around
Group：N1 is main winding, and N2 is additional coupling winding.The indirect pwm pulse control signal of VT1 gate-to-sources, source electrode connects filtering
Inductance and fly-wheel diode common port.When VT1 is turned on, fly-wheel diode cut-off, filter inductance energy storage, and provide energy to load
Amount.When otherwise VT1 ends, the now opposite induced voltage of filter inductance polarization, fly-wheel diode conducting, filter inductance storage
The energy deposited continues supply load.R8, C9, D2 constitute RCD buffer circuits, and in VT1 shutdown moments, electric current flows through electric capacity C9 and resistance
Buddhist nun diode D2, slows down the VT1 drain-source voltage rates of climb, and resistance R8 opens moment in VT1 and bleeds off electric charge on electric capacity C9 rapidly,
Prevent from too increasing by VT1 electric current.The RC buffer circuits that the parallel connection of D1 two ends is made up of R9, C10, to suppress Radio frequency interference.
As shown in figure 4, the drive circuit drives drop using gate-drive transformer, coupled capacitor and clamp diode
High-side power switch pipe in pressure type DC/DC translation circuits.It is sharp that coupled capacitor C11 connects with gate-drive transformer primary side
Magnetoelectricity sense provides resetting voltage, and secondary coupled capacitor C12 and clamp diode D3 are used for recovering the gate-drive of transformer secondary
Level.Driving force can be adjusted by changing R10 resistance, and R5 and D4 effect are protection power switch pipes.
As shown in figure 5, the detection control circuit, it controls the core of buck DC/DC translation circuits to be PWM controller
UC3844.UC3844 chip internals are integrated with the accurate reference power supplies of 5.0V, high-frequency generator, error amplifier, current detecting ratio
Compared with device, PWM latch and high current totem output circuit etc..Error amplifier and its peripheral resistance R12, electric capacity C15 and C16
Voltage close loop is constituted, is responsible for control output voltage and follows internal reference voltage signal to change.Current Transmit, diode D6,
Resistance R13 and R14 constitute the current detection circuit of power switch pipe, and current closed-loop is constituted with current sense comparator, are responsible for limit
The peak point current of power switch pipe processed.UC3844 PWM output pulse period property is opened, and voltage feedback signal is believed with reference voltage
Number relatively and after error amplifier export a DC quantity, the peak point current of the DC quantity and power switch pipe is compared,
Close pwm pulse.After UC3844 starts, powered by filter inductance L1 coupling winding N2, D5, C13 self feeding circuit constituted.
In summary, a kind of every technical performance of high pressure wide scope buck converter of the utility model is as follows：
1st, input voltage：DC 350V-640V
2nd, rated output voltage：DC 130V
3rd, output current：13A
4th, rated output power：1700W
5th, output voltage precision：≤ ± 1%
6th, operating efficiency：>=90% (full load)
7th, isolation voltage：2500VAC between input, output and shell
8th, physical parameter：180mm×100mm×70mm.
Claims (3)
1. a kind of high pressure wide scope buck converter, including input EMI filter circuit, buck DC/DC translation circuits, driving electricity
Road and detection control circuit；It is characterized in that：Direct current input is defeated by buck DC/DC translation circuits through inputting EMI filter circuit
Go out galvanic current pressure；Detection control circuit is according to the voltage feedback signal and base provided by buck DC/DC translation circuits
Potential difference between quasi- voltage signal, and power switch pipe upward peak current signal, output pulse width follow the potential difference and
The pwm pulse control signal of peak point current change is to drive circuit；Drive circuit isolated, amplify after control buck DC/
Power switch pipe in DC translation circuits, so that VD is stable.
2. a kind of high pressure wide scope buck converter according to claim 1, it is characterized in that：Input voltage is covered
DC350V-640V, output voltage covering DC100V-150V, isolation voltage is AC2500V between input, output and shell.
3. a kind of high pressure wide scope buck converter according to claim 1, it is characterized in that：The drive circuit uses door
Pole driving transformer is isolated, and the isolation voltage between the primary side winding and vice-side winding of gate-drive transformer is not less than
AC2500V。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720253249.2U CN206524761U (en) | 2017-03-15 | 2017-03-15 | A kind of high pressure wide scope buck converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720253249.2U CN206524761U (en) | 2017-03-15 | 2017-03-15 | A kind of high pressure wide scope buck converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206524761U true CN206524761U (en) | 2017-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720253249.2U Active CN206524761U (en) | 2017-03-15 | 2017-03-15 | A kind of high pressure wide scope buck converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737298A (en) * | 2020-12-29 | 2021-04-30 | 联合汽车电子有限公司 | High-pressure relief device and method |
-
2017
- 2017-03-15 CN CN201720253249.2U patent/CN206524761U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737298A (en) * | 2020-12-29 | 2021-04-30 | 联合汽车电子有限公司 | High-pressure relief device and method |
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