CN202019297U - High-power direct-current boost power source - Google Patents
High-power direct-current boost power source Download PDFInfo
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- CN202019297U CN202019297U CN2011201476642U CN201120147664U CN202019297U CN 202019297 U CN202019297 U CN 202019297U CN 2011201476642 U CN2011201476642 U CN 2011201476642U CN 201120147664 U CN201120147664 U CN 201120147664U CN 202019297 U CN202019297 U CN 202019297U
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Abstract
The utility model relates to a high-power direct-current boost power source, which comprises a low-voltage direct-current input power source, a plurality of parallelly-connected DC/DC (direct current/direct current) converters and a PWM (pulse width modulation) generator. Each DC/DC converter is connected with a PWM driver, a plurality of PWM drivers are serially connected in sequence, an output signal of the PWM generator after passing through a current-limiting resistor passes through the PWM drivers in series connection sequentially and reflows to the PWM generator to form a return circuit, and a shunt resistor is parallelly connected to two ends of a primary optical coupler of each PWM driver. The power source adopting one PWM signal enables input signals of all the PWM drivers are identical, output current of different DC/DC converters are same or similar, differences generated by adoption of different PWM signals of different PWM drivers in the prior art are overcome, differences among the output current of different DC/DC converters are decreased, and current sharing among a plurality of DC/DC converters is enhanced.
Description
Technical field
The utility model relates to the power supply in a kind of battery power supply system, particularly a kind of high power DC booster power.
Background technology
In battery power supply system, generally all change the voltage of the electric work power of automatic power supply by the DC/DC converter, export to load then.In the prior art, in order to improve power output, the mode of a plurality of DC/DC converter parallel connection is adopted in the capital, each DC/DC converter connects pwm driver and PWM generator separately, though this mode can be regulated the height of each DC/DC converter output voltage separately, but because the difference that independently pwm signal produced separately, operating frequency such as the PWM drive signal, the difference of PWM drive signal current amplitude size etc., all increased the difference of each DC/DC converter output current, current sharing between a plurality of DC/DC converters is relatively poor, and the electric current output waveform of power supply is undesirable.
Summary of the invention
The utility model main purpose is to address the above problem and is not enough, provides a kind of output current difference of different DC/DC converters little, the high power DC booster power that current sharing is good.
For achieving the above object, the technical solution of the utility model is:
A kind of high power DC booster power, the DC/DC converter that comprises low-voltage direct input power supply, a plurality of parallel connections, also comprise a PWM generator, each described DC/DC converter is connected with a pwm driver separately, be connected in series successively between a plurality of described pwm drivers, the output signal of described PWM generator is behind current-limiting resistance, through a plurality of described pwm driver that being connected in series successively, be back to described PWM generator at last, constitute a loop, the two ends of the elementary optocoupler of each described pwm driver are parallel with a shunting electricity group.
Further, the resistance of each described shunt resistance is identical.
Further, through the current value of each described shunt resistance for through 1/10th of the current value of the described pwm driver elementary optocoupler in parallel with it.
Content to sum up, high power DC booster power provided by the utility model, adopt a pwm signal, make that the input signal of each pwm driver is identical, reaching different DC/DC converters exports identical, overcome different pwm driver of the prior art and adopted the different difference that pwm signal produced, reduced the difference of different DC/DC converter output currents, increased the current sharing between a plurality of DC/DC converters.
Description of drawings
Fig. 1 is a circuit structure diagram of the present utility model.
As shown in Figure 1, low-voltage direct input power supply 1, DC/DC converter 2, DC/DC converter 3, pwm driver 4, pwm driver 5, PWM generator 6.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:
As shown in Figure 1, a kind of high power DC booster power, comprise low-voltage direct input power supply 1, in the present embodiment, the rated voltage of low-voltage direct input power supply 1 is 48V, behind the DC/DC converter 2 and 3 through two parallel connections, boost to the specified DC260V of output, provide needed DC power supply to load, the power of each DC/DC converter is 3KW, and back in parallel gross output is 6KW.The quantity of DC/DC converter parallel connection can be according to actual needs and different, can be two, also can be for more than two.
DC/DC converter 2 is connected with a pwm driver 4, and DC/DC converter 3 is connected with a pwm driver 5, and the model of pwm driver 4 and pwm driver 5 is chosen as M57962L in the present embodiment.The elementary optocoupler VL of pwm driver 4
ABElementary optocoupler VL with pwm driver 5
BCBetween be connected in series successively.
Include only a PWM generator 6 in this direct current boosting power, make PWM generator 5 identical, thereby it is identical with the output of DC/DC converter 3 to reach DC/DC converter 2 with the input signal of PWM generator 6.The output signal of PWM generator 6 at first behind current-limiting resistance R1, enters the elementary optocoupler VL4 of pwm driver 4, enters the elementary optocoupler VL5 of pwm driver 5 after the output again, is back to PWM generator 6 at last, constitutes a loop.
In order to make elementary optocoupler VL4 identical with the voltage at the two ends of elementary optocoupler VL5, the two ends of elementary optocoupler VL4 are parallel with a shunting electricity group R4, the two ends of an elementary optocoupler VL5 shunting electricity group R5 in parallel too, for guaranteeing the current sharing of two DC/DC converters 2 and DC/DC converter 3, R4 is identical with the resistance of shunt resistance R5 for shunting electricity group.
, same through the current value of shunt resistance R4 for through 1/10th of the current value of the elementary optocoupler VL4 in parallel with it, through the current value of shunt resistance R5 for through ten of the current value of the elementary optocoupler VL5 in parallel with it/
The selection principle of shunt resistance R4 and resistance R 5 resistances:
The electric current that flows through shunt resistance R4 and resistance R 5 resistances can not be above 1/3 (reserving enough impact surpluses) of PWM generator 6 output currents with the electric current sum that flows through pwm driver, shunt resistance R4 and resistance R 5 resistances are big more, shunt current can be more little, but all component voltage can variation. here the current value of shunt resistance R4 and resistance R 5 resistances be elementary optocoupler VL4 and elementary optocoupler VL5 current value 1/10th.
The resistance of current-limiting resistance R1, R1=(V
PWM-(V
AB+ V
BC))/I (1).
Wherein, V
PWMOutput voltage for PWM generator 6;
V
ABBe the A of pwm driver 4, the voltage of B two-end-point (by given in pwm driver 4 specifications);
V
BCBe the B of pwm driver 5, the voltage of C two-end-point (by given in pwm driver 5 specifications);
I is the rated current (by given in pwm driver 4 and pwm driver 5 specifications) of pwm driver 4 and pwm driver 5.
Shunting electricity group V
ABWith shunt resistance V
BCResistance, R4=R5=V
AB/ I/10 (2)
Wherein, V
ABBe the A of pwm driver 4, the voltage of B two-end-point (by given in pwm driver 4 specifications);
I is the rated current (by given in pwm driver 4 specifications) of pwm driver 4.
In the present embodiment, the output voltage of PWM generator 6 is 12V, and the model of pwm driver 4 and pwm driver 5 is chosen as M57962L, and M57962L reference-input signal voltage is 5V, and electric current is 16 milliamperes.
The above-mentioned formula of substitution (1) can calculate the resistance of current-limiting resistance R1, R1=(12V-5V*2)/16mA=125 Ω.
The above-mentioned formula of substitution (2) can calculate the resistance that the shunting electricity is organized R4 and shunt resistance R5,
R4＝R5＝5V/16mA/10＝3.125KΩ。Get approximation 3K Ω.
As mentioned above, given in conjunction with the accompanying drawings and embodiments scheme content can derive the similar techniques scheme.In every case be the content that does not break away from technical solutions of the utility model, to any simple modification, equivalent variations and modification that above embodiment did, all still belong in the scope of technical solutions of the utility model according to technical spirit of the present utility model.
Claims (3)
1. high power DC booster power, the DC/DC converter that comprises low-voltage direct input power supply, a plurality of parallel connections, it is characterized in that: also comprise a PWM generator, each described DC/DC converter is connected with a pwm driver separately, be connected in series successively between a plurality of described pwm drivers, the output signal of described PWM generator is behind current-limiting resistance, through a plurality of described pwm driver that being connected in series successively, be back to described PWM generator at last, constitute a loop, the two ends of the elementary optocoupler of each described pwm driver are parallel with a shunting electricity group.
2. high power DC booster power according to claim 1 is characterized in that: the resistance of each described shunt resistance is identical.
3. high power DC booster power according to claim 1 and 2 is characterized in that: the current value of each described shunt resistance of process is through 1/10th of the current value of the described pwm driver elementary optocoupler in parallel with it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201476642U CN202019297U (en) | 2011-05-11 | 2011-05-11 | High-power direct-current boost power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201476642U CN202019297U (en) | 2011-05-11 | 2011-05-11 | High-power direct-current boost power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202019297U true CN202019297U (en) | 2011-10-26 |
Family
ID=44812964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201476642U Expired - Lifetime CN202019297U (en) | 2011-05-11 | 2011-05-11 | High-power direct-current boost power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202019297U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322804A (en) * | 2014-06-16 | 2016-02-10 | 株洲南车时代电气股份有限公司 | Safe power supply output circuit of dynamic signal control |
| CN105846518A (en) * | 2016-06-23 | 2016-08-10 | 珠海泰坦新动力电子有限公司 | Stage-limiting-free high-voltage charging and discharging serial and parallel connection balancing circuit |
-
2011
- 2011-05-11 CN CN2011201476642U patent/CN202019297U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322804A (en) * | 2014-06-16 | 2016-02-10 | 株洲南车时代电气股份有限公司 | Safe power supply output circuit of dynamic signal control |
| CN105322804B (en) * | 2014-06-16 | 2018-04-13 | 株洲南车时代电气股份有限公司 | A kind of safety power supply output circuit of Dynamic Signal control |
| CN105846518A (en) * | 2016-06-23 | 2016-08-10 | 珠海泰坦新动力电子有限公司 | Stage-limiting-free high-voltage charging and discharging serial and parallel connection balancing circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111026 |