CN204244076U - Ultra-wide input voltage DC-DC power source - Google Patents
Ultra-wide input voltage DC-DC power source Download PDFInfo
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- CN204244076U CN204244076U CN201420365436.6U CN201420365436U CN204244076U CN 204244076 U CN204244076 U CN 204244076U CN 201420365436 U CN201420365436 U CN 201420365436U CN 204244076 U CN204244076 U CN 204244076U
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Abstract
The utility model relates to a kind of ultra-wide input voltage DC-DC power source, and wherein, power supply is formed primarily of primary high pressure part and secondary low-voltage part.Primary high pressure part comprises: safety circuit and EMI filter circuit, and high-pressure side is input to safety circuit and EMI filter circuit; Overvoltage crowbar, overvoltage crowbar is delivered in the output of EMI filter circuit; High frequency transformer and power switch pipe, high frequency transformer is received in the output of overvoltage crowbar, high pressure is reduced to the low pressure of needs.Secondary low-voltage part comprises rectification circuit, and rectification circuit is delivered in the output of high frequency transformer.Power switch pipe is connected to pwm chip, and pwm chip produces the break-make that driving pulse controls power switch pipe.Sampling feedback circuit is connected to the output of rectification circuit, and sampling feedback circuit is connected to pwm chip through buffer circuit, and pwm chip controls output duty cycle, regulation output voltage.This power supply can be implemented in bootstrapping power supply in power electronics rack.
Description
Technical field
The utility model relates to electrical equipment, particularly a kind of ultra-wide input voltage DC-DC power source, and it is suitable for using in inverter, frequency converter.
Background technology
In recent years, along with the development of power electronic technology, power electronic equipment kind is complicated, application is extensive.Major product comprises frequency converter, inverter, current transformer, Switching Power Supply etc., and application comprises wind electric converter, photovoltaic DC-to-AC converter, station-service frequency converter, electrical network reactive-load compensator etc.The aspect such as volume, weight, efficiency of each application to power supply proposes more and more higher requirement.
The Switching Power Supply that current each field adopts is essentially and adopts in cabinet UPS to power for each device.Power supply for power cell internal adopts above-mentioned supply power mode to have the deficiencies such as complex structure, cost is high, efficiency is low.For this reason, select a kind of efficient, to stablize DC-DC bootstrap power supply very necessary.This eliminate many external devices, both simplified Power Management Design, saved cost, higher conversion efficiency can be obtained again.
Utility model content
The utility model proposes a kind of ultra-wide input voltage DC-DC power source, it can solve the problem well, and can be implemented in bootstrapping power supply in power electronics rack.
The utility model can be realized by following proposal.
A kind of ultra-wide input voltage DC-DC power source, wherein, described power supply is formed primarily of primary high pressure part and secondary low-voltage part,
Described primary high pressure part comprises:
Safety circuit and EMI filter circuit, high-pressure side is input to described safety circuit and described EMI filter circuit;
Overvoltage crowbar, described overvoltage crowbar is delivered in the output of described EMI filter circuit;
High frequency transformer and power switch pipe, described high frequency transformer is received in the output of described overvoltage crowbar, high pressure is reduced to the low pressure of needs,
Described secondary low-voltage part comprises rectification circuit, and described rectification circuit is delivered in the output of described high frequency transformer.
Preferably, described power switch pipe is connected to pwm chip, and described pwm chip produces the break-make that driving pulse controls described power switch pipe.
Preferably, sampling feedback circuit is connected to the output of described rectification circuit, and described sampling feedback circuit is connected to described pwm chip through buffer circuit, and described pwm chip controls output duty cycle, regulation output voltage.
Preferably, described power switch pipe is K2225, and rated voltage is 1500V, and rated current is 2A, and maximum switching frequency reaches 1MHz.
Preferably, described pwm chip is UC3844.
Preferably, described high frequency transformer has former limit input winding, secondary exports winding and bootstrapping power supply winding.
Preferably, the magnetic core of transformer of described high frequency transformer is Philip magnetic core EFD25.
Preferably, described rectification circuit comprises fast recovery diode BYV29, C-L-C filter circuit.
Preferably, described buffer circuit comprises optocoupler PC817.
High-pressure side is input to safety circuit and EMI filter circuit, can prevent surge voltage, overload current, the effects such as filtering interfering.
Overvoltage crowbar is delivered in output, input voltage can be controlled in rational scope, prevents input from too highly causing device failure.
Output voltage gathers compensating circuit through error, through electrical isolation device, signal is delivered to pwm chip, regulation output voltage.
Preferably, the driving chip of described MO SFET selects PWM chip UC3844.This chip carries out control by electric current loop and Voltage loop two close cycles and exports, and has fast response time, feature that degree of regulation is high.
Preferably, described high frequency transformer can be custom transformer.
Preferably, described error gathers compensating circuit and selects shunt regulator diode TL431, can realize the output error sampling of Vref to 36V by arranging sample resistance.Circuit, by adding zeros and poles, realizes frequency compensation.
Described isolating device selects optocoupler PC817, can realize the electrical isolation of high-low pressure.
This power supply is by being transferred to low-pressure side by energy by transformer by switching tube break-make by bus direct voltage.And by switch tube current sample and output voltage sampling, realize electric current loop and Voltage loop double-closed-loop control.
This power supply can meet power demands in cabinet, have simultaneously wide input voltage range, degree of regulation high, respond feature rapidly.For simplification power supply region, cost-saving, there is very positive effect.
This power supply has the advantages that structure is simple, reliability is strong, can extensive use in wind electric converter, photovoltaic DC-to-AC converter and high voltage converter.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the ultra-wide input voltage DC-DC power source according to an execution mode of the present utility model.
Fig. 2 is the general principle figure of described power supply.
Fig. 3 is the functional block diagram of the UC3844 of example as the pwm chip according to an execution mode of the present utility model.
Embodiment
Be described in further details as follows below in conjunction with accompanying drawing to embodiment of the present utility model.
As seen from Figure 2, this schematic diagram, on the basis of the schematic diagram shown in Fig. 1, adds the local circuit of each circuit part.As shown in Figure 1, this power circuit comprises high-pressure area and area of low pressure.Particularly, this power circuit comprises: several parts such as EMI filter circuit 1000, overvoltage crowbar 2000, switching device (namely by switching tube MOSFET) 5000, high frequency transformer 3000, sampling feedback circuit 6000, buffer circuit 8000, pwm chip 7000.
In one example, described pwm chip 7000 is the functional block diagram that UC3844, Fig. 3 show UC3844, does not elaborate at this.
Wherein, high pressure (enters high frequency transformer 3000 through safety and EMI circuit 1000, overvoltage crowbar after 2000; by power switch pipe MOSFET5000 break-make, realize by Energy Transfer to transformer secondary output output, namely export via after secondary commutation filtering 4000.
Information, by monitoring output error, is passed to pwm chip 7000 by buffer circuit 8000 by sampling feedback compensating circuit 6000, and control chip passes through the feedback information collected, and regulation output pulse duty factor realizes the control to exporting.The stable of whole loop gain and phase place is ensured according to the method adding zeros and poles in compensating circuit.
The input service voltage range of this power supply can be very wide, can adapt to the need of work of different occasion.In the course of the work, bus high pressure is converted to the low pressure that control circuit needs, without the need to can realize bootstrapping power supply by external power supply.The a series of corresponding failure because current supply circuit fault causes can be eliminated completely.Can play a very good protection to power circuit and control protection electric circuit.
The feature of this utility model includes, but are not limited to:
Requirement 60V ~ the 1200V of super wide voltage input can be realized, different application occasion and operating mode can be adapted to;
Bootstrapping power supply can be realized at a dc voltage, can be unaffected when the external power system failure, thus protection interlock circuit;
Custom transformer can realize micro-leakage inductance, thus the while of reducing the harmful effect to circuit, efficiency of transmission is high;
Sampling feedback compensation circuit can realize Double closed-loop of voltage and current, and control precision is high, response is fast.
Multiple coil exports, and can be weighted assessment according to each output operating mode to feedback loop, and feedback information is more comprehensively reliable.
Above with reference to illustrating preferred implementation of the present utility model.But, should be appreciated that above-mentioned explanation is only exemplary.Those skilled in the art under the prerequisite not departing from spirit and scope of the present utility model, can make various modifications and variations to the utility model.Protection range of the present utility model is limited by the accompanying claims.
Claims (9)
1. a ultra-wide input voltage DC-DC power source, is characterized in that, described power supply is formed primarily of primary high pressure part and secondary low-voltage part,
Described primary high pressure part comprises:
Safety circuit and EMI filter circuit, high-pressure side is input to described safety circuit and described EMI filter circuit;
Overvoltage crowbar, described overvoltage crowbar is delivered in the output of described EMI filter circuit;
High frequency transformer and power switch pipe, described high frequency transformer is received in the output of described overvoltage crowbar, high pressure is reduced to the low pressure of needs,
Described secondary low-voltage part comprises rectification circuit, and described rectification circuit is delivered in the output of described high frequency transformer.
2. ultra-wide input voltage DC-DC power source according to claim 1, is characterized in that,
Described power switch pipe is connected to pwm chip, and described pwm chip produces the break-make that driving pulse controls described power switch pipe.
3. ultra-wide input voltage DC-DC power source according to claim 2, is characterized in that,
Sampling feedback circuit is connected to the output of described rectification circuit, and described sampling feedback circuit is connected to described pwm chip through buffer circuit, and described pwm chip controls output duty cycle, regulation output voltage.
4. the ultra-wide input voltage DC-DC power source according to any one in claims 1 to 3, is characterized in that,
Described power switch pipe is K2225, and rated voltage is 1500V, and rated current is 2A, and maximum switching frequency reaches 1MHz.
5. the ultra-wide input voltage DC-DC power source according to Claims 2 or 3, is characterized in that,
Described pwm chip is UC3844.
6. the ultra-wide input voltage DC-DC power source according to any one in claims 1 to 3, is characterized in that,
Described high frequency transformer has former limit input winding, secondary exports winding and bootstrapping power supply winding.
7. ultra-wide input voltage DC-DC power source according to claim 6, is characterized in that,
The magnetic core of transformer of described high frequency transformer is Philip magnetic core EFD25.
8. the ultra-wide input voltage DC-DC power source according to any one in claims 1 to 3, is characterized in that,
Described rectification circuit comprises fast recovery diode BYV29, C-L-C filter circuit.
9. ultra-wide input voltage DC-DC power source according to claim 3, is characterized in that,
Described buffer circuit comprises optocoupler PC817.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420365436.6U CN204244076U (en) | 2014-07-03 | 2014-07-03 | Ultra-wide input voltage DC-DC power source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420365436.6U CN204244076U (en) | 2014-07-03 | 2014-07-03 | Ultra-wide input voltage DC-DC power source |
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| CN204244076U true CN204244076U (en) | 2015-04-01 |
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| CN201420365436.6U Expired - Lifetime CN204244076U (en) | 2014-07-03 | 2014-07-03 | Ultra-wide input voltage DC-DC power source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515396A (en) * | 2016-02-02 | 2016-04-20 | 无锡隆玛科技股份有限公司 | Photovoltaic power module |
| CN108233721A (en) * | 2018-03-21 | 2018-06-29 | 精进电动科技股份有限公司 | A kind of low-voltage power supply circuit |
-
2014
- 2014-07-03 CN CN201420365436.6U patent/CN204244076U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515396A (en) * | 2016-02-02 | 2016-04-20 | 无锡隆玛科技股份有限公司 | Photovoltaic power module |
| CN105515396B (en) * | 2016-02-02 | 2018-04-10 | 无锡隆玛科技股份有限公司 | Photo-voltaic power supply module |
| CN108233721A (en) * | 2018-03-21 | 2018-06-29 | 精进电动科技股份有限公司 | A kind of low-voltage power supply circuit |
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