CN203104320U - High-power parallel switch power circuit capable of realizing adjustable current sharing - Google Patents
High-power parallel switch power circuit capable of realizing adjustable current sharing Download PDFInfo
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- CN203104320U CN203104320U CN 201320139408 CN201320139408U CN203104320U CN 203104320 U CN203104320 U CN 203104320U CN 201320139408 CN201320139408 CN 201320139408 CN 201320139408 U CN201320139408 U CN 201320139408U CN 203104320 U CN203104320 U CN 203104320U
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Abstract
The utility model discloses a high-power parallel switch power circuit capable of realizing adjustable current sharing, and relates to a switch power circuit. A power supply which is subjected to capacity expanding by a parallel module is complex in structure and high in cost when a highest current automatic current sharing method and a current-sharing controller are adopted to realize the current sharing. The high-power parallel switch power circuit is characterized in that a control circuit comprises a current sampling unit, a voltage sampling unit, a current-sharing bus unit connected with the current sampling unit, a current-sharing control voltage acquisition unit, an adjustable external reference voltage unit, an adjustable external current-limiting reference voltage unit, a voltage error amplifying unit, and a current error amplifying unit, wherein the voltage error amplifying unit comprises a first operational amplifier; and the first operational amplifier is respectively connected with the voltage sampling unit, the current-sharing bus unit, the adjustable external reference voltage unit and the current-sharing control voltage acquisition unit. The technical scheme realizes the highest current automatic current sharing through a pure hardware circuit without a controller, and simultaneously, achieves a practical circuit with adjustable output voltage; and the high-power parallel switch power circuit is simple in structure and low in cost.
Description
Technical field
The utility model relates to a kind of switching power circuit.
Background technology
In the energy source use field, the large power supply system applies is come extensively more, but is subjected to the power device capacity, the restriction of reasons such as magnetic material and heat radiation, and single switch power module peak power output can only be used for middle low power, for example below the 3KW.The power supply development trend is to adopt modularization, carries out dilatation by parallel connection, becomes cordwood system type, intelligentized large power, electrically origin system with less relatively power module combinations.
In the use in parallel of each module, because the dispersiveness of each autoregressive parameter of electronic devices and components, make the open circuit voltage and the internal resistance of each power supply all can there are differences, the internal resistance of Switching Power Supply is all very little usually, so the open circuit voltage little difference will cause the output current of each power supply that bigger difference is arranged.This state can cause not busy not busy dead, busy busy dead phenomenon: the module that has is in overwork, and the loss heating is all compared severe, and the life-span can reduce; And have work in underloading, even all do not enter operating state preferably.At this moment just need introduce effective load allocating or sharing control strategy in multimode parallel running system, the current-sharing scheme has much the output impedance method at present, the principal and subordinate is provided with method, average current method, maximum current autonomous equalizing current method and add equalizing controller, complex structure, the cost height.Do not using under the peripheral control unit situation, most of situation can only realize current-sharing under fixed voltage and power, the current-sharing weak effect.
The utility model content
The technical assignment of the technical problems to be solved in the utility model and proposition is that the prior art scheme is improved and improved, and provides a kind of high-power paralleling switch power circuit of realizing being in harmonious proportion current-sharing, effective to reach current-sharing, simple in structure purpose.For this reason, the utility model is taked following technical scheme.
A kind of high-power paralleling switch power circuit of realizing being in harmonious proportion current-sharing comprises power circuit and control circuit, the power circuit parallel connection of a plurality of power modules, and each power module is provided with control circuit, it is characterized in that: control circuit comprises
Current sampling unit obtains the current sampling data of the power circuit of power module;
The voltage sample unit obtains the voltage sample value of the power circuit of power module;
The current equalizing bus bar unit that links to each other with current sampling unit, with the maximum current sampled value as the current equalizing bus bar value;
Sharing control voltage acquiring unit, with current sampling data and current equalizing bus bar value as error amplify the sharing control magnitude of voltage;
The external reference voltage value is set in adjustable external reference voltage unit;
Adjustable outside current limliting reference voltage unit is set outside maximum reference voltage level;
The voltage error amplifying unit, according to current sampling data, current equalizing bus bar value, external reference voltage value, sharing control magnitude of voltage, obtain the voltage error value of magnification and export the PWM controller to,, make the feedback current value of each module identical with the current equalizing bus bar value to regulate output voltage, electric current;
The current error amplifying unit is done maximum reference current value in outside and current sampling data the error amplification and is exported the PWM controller to, with the restriction maximum current;
Described voltage error amplifying unit comprises first operational amplifier, the inverting input of first operational amplifier links to each other with voltage sample unit output and current equalizing bus bar unit output, and in-phase input end links to each other with adjustable external reference voltage unit output and sharing control voltage acquiring unit output.
As the further of technique scheme improved and replenish, the utility model also comprises following additional technical feature.
Control circuit comprises that also current sample follows the unit, to avoid each cell influence current sampling signal.
Described current following unit comprises the 5th operational amplifier, and the in-phase input end of the 5th operational amplifier links to each other with the current sampling unit output, and the inverting input of the 5th operational amplifier, output, sharing control voltage acquiring unit input link to each other.
Described current equalizing bus bar unit comprises four-operational amplifier, and the in-phase input end of four-operational amplifier links to each other with the current sample output, and its output links to each other with current equalizing bus bar through first diode.
Described sharing control voltage acquiring unit comprises the 3rd operational amplifier, the in-phase input end of the 3rd operational amplifier links to each other with current equalizing bus bar unit output, its inverting input is followed the unit output with current sample and is linked to each other, and the output of the 3rd operational amplifier links to each other with the in-phase input end of first operational amplifier by the 5th diode.
The in-phase input end of described the 3rd operational amplifier and inverting input connect adjustable resistance respectively.
The current error amplifying unit comprises second operational amplifier; The in-phase input end of second operational amplifier links to each other with adjustable outside current limliting reference voltage unit output, and its inverting input links to each other with current equalizing bus bar unit output, differential concatenation second diode between its output and the PWM controller.
The output of described first operational amplifier links to each other with its inverting input by the 4th diode, and the 4th diode and electric capacity, resistance series circuit are in parallel; Series resistance between the inverting input of the output of current equalizing bus bar unit and first operational amplifier, differential concatenation the 3rd diode between voltage error amplifying unit and the PWM controller.
Described power circuit comprises current rectifying and wave filtering circuit, booster circuit, semi-bridge alternation circuit, isolating transformer; Described semi-bridge alternation circuit comprises first, second electric capacity and first, second insulated gate bipolar transistor, first electric capacity, second capacitance series are at the positive and negative two ends of booster circuit, the junction of first electric capacity, second electric capacity is connected with isolating transformer primary coil one end, and the isolating transformer primary coil other end is connected with first, second insulated gate bipolar transistor.
Beneficial effect: the technical program realizes maximum current autonomous equalizing current, not tape controller with pure hardware circuit; Reach the practical circuit of Adjustable Output Voltage simultaneously; Simple in structure, cost is low.
Description of drawings
Fig. 1 is the utility model current-sharing feedback topology figure.
Fig. 2 is the utility model power circuit topological diagram.
Fig. 3 is the utility model control circuit figure.
Embodiment
Below in conjunction with Figure of description the technical solution of the utility model is described in further detail.
As shown in Figure 1, the utility model comprises power circuit and control circuit, the power circuit parallel connection of a plurality of power modules, and each power module is provided with control circuit; Control circuit comprises: current sampling unit, obtain the current sampling data of the power circuit of power module; The voltage sample unit obtains the voltage sample value of the power circuit of power module; The current equalizing bus bar unit that links to each other with current sampling unit, with the maximum current sampled value as the current equalizing bus bar value; Sharing control voltage acquiring unit, with current sampling data and current equalizing bus bar value as error amplify the sharing control magnitude of voltage; The external reference voltage value is set in adjustable external reference voltage unit; Adjustable outside current limliting reference voltage unit is set outside maximum reference voltage level; The voltage error amplifying unit, according to current sampling data, current equalizing bus bar value, external reference voltage value, sharing control magnitude of voltage, obtain the voltage error value of magnification and export the PWM controller to,, make the feedback current value of each module identical with the current equalizing bus bar value to regulate output voltage, electric current; The current error amplifying unit is done maximum reference current value in outside and current sampling data the error amplification and is exported the PWM controller to, with the restriction maximum current.
The voltage error amplifying unit comprises the first operational amplifier U1, the inverting input of the first operational amplifier U1 links to each other with voltage sample unit output and current equalizing bus bar unit output, and in-phase input end links to each other with adjustable external reference voltage unit output and sharing control voltage acquiring unit output; Current sample is followed the unit, to avoid each cell influence current sampling signal.The current following unit comprises the 5th operational amplifier U5, and the in-phase input end of the 5th operational amplifier U5 links to each other with the current sampling unit output, and the inverting input of the 5th operational amplifier U5, output, sharing control voltage acquiring unit input link to each other.The current equalizing bus bar unit comprises four-operational amplifier U4, and the in-phase input end of four-operational amplifier U4 links to each other with the current sample output, and its output links to each other with current equalizing bus bar through the first diode D1.Sharing control voltage acquiring unit comprises the 3rd operational amplifier U3, the in-phase input end of the 3rd operational amplifier U3 links to each other with current equalizing bus bar unit output, its inverting input is followed the unit output with current sample and is linked to each other, and the output of the 3rd operational amplifier U3 links to each other with the in-phase input end of the first operational amplifier U1 by the 5th diode D5.The in-phase input end of the 3rd operational amplifier U3 and inverting input connect adjustable resistance RT respectively.The current error amplifying unit comprises the second operational amplifier U2; The in-phase input end of the second operational amplifier U2 links to each other with adjustable outside current limliting reference voltage unit output, and its inverting input links to each other with current equalizing bus bar unit output, the differential concatenation second diode D2 between its output and the PWM controller.The output of the first operational amplifier U1 links to each other with its inverting input by the 4th diode D4, and the 4th diode D4 and electric capacity, resistance series circuit are in parallel; Series resistance between the inverting input of the output of current equalizing bus bar unit and the first operational amplifier U1, differential concatenation the 3rd diode D3 between voltage error amplifying unit and the PWM controller.
Among Fig. 2, V
OutBe output voltage, V
ComBe current equalizing bus bar voltage, V
RefBe adjustable external reference voltage, V
RefIBe adjustable outside current limliting reference voltage, V
iBe current sample output signal, V
cFor current sample output signal and current equalizing bus bar carry out sharing control voltage after error is amplified.
U4 part and diode D1 realize, voltage signal on current equalizing bus bar is than the voltage height of the current sampling signal of this module, the current sampling signal of this module just can not output to current equalizing bus bar, so the voltage on the bus is the current sampling signal of that module of output current maximum forever.
U5 partly follows for each blocks current sampling, avoids each computing circuit to influence current sampling signal.
U3 partly is that current equalizing bus bar voltage and each blocks current sampled voltage difference are amplified.When module as primary module work, promptly this blocks current is maximum, at this moment, current sample output signal V
iWith current equalizing bus bar voltage V
ComEquate, so sharing control voltage V
cBe zero, thereby do not influence voltage error amplifier, state work before continuing.When module is from module, promptly the current sampling signal magnitude of voltage is lower than current equalizing bus bar voltage V
Com,Sharing control voltage V
cBe current sample output signal V
iWith current equalizing bus bar voltage V
ComFunction.
The U1 partial circuit is a voltage error amplifier, and inverting input is the comprehensive of the sampled value of module output voltage and current equalizing bus bar magnitude of voltage, and in-phase input end is adjustable external reference voltage V
Ref,And sharing control voltage V
cComprehensive, regulate output.
The U2 partial circuit is the current error amplifier, and inverting input is current equalizing bus bar voltage V
Com, in-phase input end is adjustable outside current limliting reference voltage V
RefI
Behind the output process D3 and D2 of output of first operational amplifier and current error amplifier, be input to the in-phase input end of SG3525, do not utilize its error amplifier, partly realize by external error amplifier U1 part and U2 fully.The convenient like this Current limited Control and different voltage output functions of realizing.
As shown in Figure 2, described power circuit comprises current rectifying and wave filtering circuit, booster circuit, semi-bridge alternation circuit, isolating transformer; Described semi-bridge alternation circuit comprises first, second electric capacity and first, second insulated gate bipolar transistor, first electric capacity, second capacitance series are at the positive and negative two ends of booster circuit, the junction of first electric capacity, second electric capacity is connected with isolating transformer primary coil one end, and the isolating transformer primary coil other end is connected with first, second insulated gate bipolar transistor.Two-phase alternating current is got in input, and through the rectifier bridge rectification, filtering is fixed voltage 310V direct current, and the 310V direct current can not satisfy the part user demand, needs the DC/DC booster circuit, passes through the half-bridge converter topology afterwards, regulates output voltage.Here use bridge type topology, can be with the leakage inductance due to voltage spikes clamper of transformer primary in the present voltage of direct current, and the leakage inductance energy stored fed back to inlet highway, rather than loss is having on the resistive element of buffer circuit.The driving of two IGBT of half-bridge topology by the output of SG3525, was controlled afterwards through transformer isolation.
The realization result of this circuit, pure hardware mode with the output in parallel of 4 block power supply plates, has been realized 5kW, the adjustable output of 0 ~ 400V voltage.
| Output voltage 250V | Output voltage 300V | Output voltage 400V | |
| I1(A) | 4.92 | 4.12 | 3.14 |
| I2(A) | 5 | 4.21 | 3 |
| I3(A) | 4.95 | 4.18 | 3.21 |
| I4(A) | 5.09 | 4.2 | 3.15 |
It is specific embodiment of the utility model that a kind of shown in above Fig. 1-3 realizes being in harmonious proportion the high-power paralleling switch power circuit of current-sharing; the utility model substantive distinguishing features and progress have been embodied; can be according to the use needs of reality; under enlightenment of the present utility model; it is carried out the equivalent modifications of aspects such as shape, structure, all at the row of the protection range of this programme.
Claims (9)
1. a realization can be in harmonious proportion the high-power paralleling switch power circuit of current-sharing, comprises power circuit and control circuit, the power circuit parallel connection of a plurality of power modules, and each power module is provided with control circuit, it is characterized in that: control circuit comprises
Current sampling unit obtains the current sampling data of the power circuit of power module;
The voltage sample unit obtains the voltage sample value of the power circuit of power module;
The current equalizing bus bar unit that links to each other with current sampling unit, with the maximum current sampled value as the current equalizing bus bar value;
Sharing control voltage acquiring unit, with current sampling data and current equalizing bus bar value as error amplify the sharing control magnitude of voltage;
The external reference voltage value is set in adjustable external reference voltage unit;
Adjustable outside current limliting reference voltage unit is set outside maximum reference voltage level;
The voltage error amplifying unit, according to current sampling data, current equalizing bus bar value, external reference voltage value, sharing control magnitude of voltage, obtain the voltage error value of magnification and export the PWM controller to,, make the feedback current value of each module identical with the current equalizing bus bar value to regulate output voltage, electric current;
The current error amplifying unit is done maximum reference current value in outside and current sampling data the error amplification and is exported the PWM controller to, with the restriction maximum current;
Described voltage error amplifying unit comprises first operational amplifier (U1), the inverting input of first operational amplifier (U1) links to each other with voltage sample unit output and current equalizing bus bar unit output, and in-phase input end links to each other with adjustable external reference voltage unit output and sharing control voltage acquiring unit output.
2. a kind of high-power paralleling switch power circuit of realizing being in harmonious proportion current-sharing according to claim 1 is characterized in that: control circuit comprises that also current sample follows the unit, to avoid each cell influence current sampling signal.
3. a kind of high-power paralleling switch power circuit of realizing to be in harmonious proportion current-sharing according to claim 2, it is characterized in that: described current following unit comprises the 5th operational amplifier (U5), the in-phase input end of the 5th operational amplifier (U5) links to each other with the current sampling unit output, and the inverting input of the 5th operational amplifier (U5), output, sharing control voltage acquiring unit input link to each other.
4. a kind of high-power paralleling switch power circuit of realizing to be in harmonious proportion current-sharing according to claim 1, it is characterized in that: described current equalizing bus bar unit comprises four-operational amplifier (U4), the in-phase input end of four-operational amplifier (U4) links to each other with the current sample output, and its output links to each other with current equalizing bus bar through first diode (D1).
5. a kind of high-power paralleling switch power circuit of realizing to be in harmonious proportion current-sharing according to claim 1, it is characterized in that: described sharing control voltage acquiring unit comprises the 3rd operational amplifier (U3), the in-phase input end of the 3rd operational amplifier (U3) links to each other with current equalizing bus bar unit output, its inverting input is followed the unit output with current sample and is linked to each other, and the output of the 3rd operational amplifier (U3) links to each other with the in-phase input end of first operational amplifier (U1) by the 5th diode (D5).
6. a kind of high-power paralleling switch power circuit of realizing being in harmonious proportion current-sharing according to claim 5, it is characterized in that: the in-phase input end of described the 3rd operational amplifier (U3) and inverting input connect adjustable resistance (RT) respectively.
7. a kind of high-power paralleling switch power circuit of realizing being in harmonious proportion current-sharing according to claim 1, it is characterized in that: the current error amplifying unit comprises second operational amplifier (U2); The in-phase input end of second operational amplifier (U2) links to each other with adjustable outside current limliting reference voltage unit output, and its inverting input links to each other with current equalizing bus bar unit output, differential concatenation second diode (D2) between its output and the PWM controller.
8. according to the described a kind of high-power paralleling switch power circuit of realizing to be in harmonious proportion current-sharing of the arbitrary claim of claim 1-7, it is characterized in that: the output of described first operational amplifier (U1) links to each other with its inverting input by the 4th diode (D4), and the 4th diode (D4) and electric capacity, resistance series circuit are in parallel; Series resistance between the inverting input of the output of current equalizing bus bar unit and first operational amplifier (U1), differential concatenation the 3rd diode (D3) between voltage error amplifying unit and the PWM controller.
9. a kind of high-power paralleling switch power circuit of realizing being in harmonious proportion current-sharing according to claim 7, it is characterized in that: described power circuit comprises current rectifying and wave filtering circuit, booster circuit, semi-bridge alternation circuit, isolating transformer; Described semi-bridge alternation circuit comprises first, second electric capacity and first, second insulated gate bipolar transistor, first electric capacity, second capacitance series are at the positive and negative two ends of booster circuit, the junction of first electric capacity, second electric capacity is connected with isolating transformer primary coil one end, and the isolating transformer primary coil other end is connected with first, second insulated gate bipolar transistor.
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| CN 201320139408 CN203104320U (en) | 2013-03-26 | 2013-03-26 | High-power parallel switch power circuit capable of realizing adjustable current sharing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320139408 CN203104320U (en) | 2013-03-26 | 2013-03-26 | High-power parallel switch power circuit capable of realizing adjustable current sharing |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178730A (en) * | 2013-03-26 | 2013-06-26 | 卧龙电气集团股份有限公司 | High-power parallel switch power circuit capable of realizing adjustability and current equalization |
| TWI568121B (en) * | 2015-01-13 | 2017-01-21 | Itech Electronic (Nanjing) Co Ltd | Parallel current sharing device and control method without current bus |
| CN106961223A (en) * | 2016-01-08 | 2017-07-18 | 中兴通讯股份有限公司 | The current-sharing control method and device of a kind of switching rectifier |
| CN108964432A (en) * | 2018-07-26 | 2018-12-07 | 深圳市蓝德汽车电源技术有限公司 | A kind of DCDC current control circuit of fuel cell car |
| WO2024109884A1 (en) * | 2022-11-24 | 2024-05-30 | 广州金升阳科技有限公司 | Current-sharing circuit, power supply module, and power supply system |
-
2013
- 2013-03-26 CN CN 201320139408 patent/CN203104320U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178730A (en) * | 2013-03-26 | 2013-06-26 | 卧龙电气集团股份有限公司 | High-power parallel switch power circuit capable of realizing adjustability and current equalization |
| CN103178730B (en) * | 2013-03-26 | 2016-07-06 | 卧龙电气集团股份有限公司 | A kind of high-power paralleling switch power circuit realizing being in harmonious proportion current-sharing |
| TWI568121B (en) * | 2015-01-13 | 2017-01-21 | Itech Electronic (Nanjing) Co Ltd | Parallel current sharing device and control method without current bus |
| CN106961223A (en) * | 2016-01-08 | 2017-07-18 | 中兴通讯股份有限公司 | The current-sharing control method and device of a kind of switching rectifier |
| CN106961223B (en) * | 2016-01-08 | 2020-02-18 | 中兴通讯股份有限公司 | Current sharing control method and device of switching rectifier |
| CN108964432A (en) * | 2018-07-26 | 2018-12-07 | 深圳市蓝德汽车电源技术有限公司 | A kind of DCDC current control circuit of fuel cell car |
| CN108964432B (en) * | 2018-07-26 | 2023-09-29 | 深圳市蓝德汽车电源技术有限公司 | DCDC current control circuit of fuel cell automobile |
| WO2024109884A1 (en) * | 2022-11-24 | 2024-05-30 | 广州金升阳科技有限公司 | Current-sharing circuit, power supply module, and power supply system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130731 Termination date: 20160326 |