CN209948984U - Power converter device - Google Patents
Power converter device Download PDFInfo
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- CN209948984U CN209948984U CN201821212873.9U CN201821212873U CN209948984U CN 209948984 U CN209948984 U CN 209948984U CN 201821212873 U CN201821212873 U CN 201821212873U CN 209948984 U CN209948984 U CN 209948984U
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Abstract
The utility model discloses a power converter device, it includes a main circuit, this main circuit is by exchanging/DC converting circuit and direct current/direct current converting circuit constitution, direct current/direct current converting circuit adjusts output voltage through switching on and shutting off of switch tube, in direct current/direct current converting circuit controller, through increasing a bus voltage ring and first arithmetic unit in its voltage loop for its controller is switched to when the control of bus voltage ring, power converter still can keep certain power output; the utility model discloses among the direct current/direct current converting circuit controller, through increasing a bus voltage ring and first arithmetic unit in its voltage loop for when the controller switches to during bus voltage ring control, power converter still can keep certain power output.
Description
Technical Field
The utility model relates to a power electronic product field, in particular to power converter device.
Background
In a communication power supply AC/DC module, a main circuit generally consists of a front-stage PFC circuit and a rear-stage isolation type DC/DC circuit, and a bus capacitor is connected in parallel between the two stages of circuits. The bus capacitor usually adopts a large-capacity electrolytic capacitor due to the requirement of module holding time, but the total capacity of the bus capacitor is limited due to the limitation of module volume and cost. Generally, the voltage loop bandwidth of a PFC bus is low, the dynamic performance is not good, when a load has large dynamic jump, the voltage of a bus capacitor can fluctuate in a large range, the overvoltage and undervoltage protection of the bus voltage is easily caused, and in order to process input voltage jump and output load jump, a voltage outer ring is generally added with measures such as similar nonlinear control and the like when the load jumps, so that the overvoltage and undervoltage protection of the PFC bus voltage can be guaranteed. However, when the load at the rear stage is further increased and exceeds the maximum load capacity requirement under the input voltage, the bus voltage is further pulled down until the bus undervoltage PFC is shut down, so that the whole module does not work.
When the load is a battery, the module on the system is usually set to the maximum output capacity to charge the battery, and if the input voltage is abnormally reduced and the load capacity of the module is reduced at this time, the load still charges the battery according to the previous maximum current limit point, and the module is pulled to be shut down by the load. Generally, at this time, the battery load is expected to reduce the output current of the load to continue charging, and when the input voltage returns to normal, the module can continue to be charged according to the maximum current limit point.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a power converter device is provided, can effectively solve not enough among the prior art.
The utility model discloses a realize through following technical scheme: a control method of a power converter comprises a main circuit, wherein the main circuit consists of an alternating current/direct current conversion circuit and a direct current/direct current conversion circuit, the direct current/direct current conversion circuit adjusts output voltage through the on and off of a switch tube, and in a direct current/direct current conversion circuit controller, a bus voltage loop and a first arithmetic unit are added in a voltage loop of the direct current/direct current conversion circuit controller, so that the power converter can still keep certain power output when the controller is switched to the bus voltage loop for control;
the method comprises the following steps that a switching tube in a direct current/direct current conversion circuit is controlled by a driving signal through a driving circuit to obtain the driving signal:
the bus voltage set value and the bus voltage sampling value generate a control value V1 after passing through a second arithmetic unit, and the control value V1 generates a control value V2 after passing through a first negative feedback compensation regulator; the set value of the output voltage and the sampling value of the output voltage pass through a second arithmetic unit to generate a control value V3, the control value V3 passes through a second negative feedback compensation regulator to generate a control value V4, the control value V2 and the control value V4 pass through a first arithmetic unit to generate a control value V5, and the control value V5 passes through a signal generator to generate the driving signal.
Preferably, the operation of the first arithmetic unit is a small operation, and the output value of the first arithmetic unit is the minimum value of the two input values of the first arithmetic unit;
the operation of the second arithmetic unit is a difference operation, and the output value of the second arithmetic unit is the difference value of two input values of the second arithmetic unit;
and the set value of the bus voltage is smaller than the minimum value of the bus voltage when the power converter works in a steady state.
Preferably, the control value V5 and the sampled output current value are processed by a second operator to generate a control value V6, the control value V6 is processed by a third negative feedback compensation regulator to generate a control value V7, and the control value V7 is processed by a signal generator to generate the driving signal.
Preferably, the output voltage sample value and the output current sample value are subjected to a third operator to generate a control value V8, and the control value V5 and the control value V8 are subjected to a second operator to generate the control value V6.
The operation of the third operator is a multiplication operation, that is, the output value of the third operator is the product value of two input values of the third operator.
As a preferred technical solution, the switching tube in the dc/dc conversion circuit may adopt control modes such as frequency conversion modulation, pulse width modulation, and phase shift control, and the corresponding driving signals are a switching frequency signal, a pulse duty ratio signal, and a phase shift angle signal of different switching tube duty ratios.
A power converter device comprises an AC/DC conversion circuit, a bus capacitor, a DC/DC conversion circuit, a first sampling circuit, a second sampling circuit, a drive circuit and a controller circuit, wherein the input end of the power converter device is connected with the input end of the AC/DC conversion circuit, the output end of the AC/DC conversion circuit is connected with the input end of the DC/DC conversion circuit in parallel through the bus capacitor, the output end of the DC/DC conversion circuit is connected with the output end of the power converter device, the voltage of the bus capacitor generates a bus voltage sampling value through the first sampling circuit, the output voltage obtains an output voltage sampling value through the second sampling circuit, and the bus voltage sampling value and the output voltage sampling value are sent to the controller circuit, the controller generates a driving signal under closed-loop control to control the on and off of a switching tube in the DC/DC converter through a driving circuit.
Preferably, the output current passes through the third sampling circuit to obtain an output current sample value, in the controller circuit, the control value V5 and the output current sample value pass through a second arithmetic unit to generate a control value V6, the control value V6 passes through a third negative feedback compensation regulator to generate a control value V7, the control value V7 passes through a signal generator to generate a driving signal, and the driving signal controls the on and off of a switching tube in the dc/dc conversion circuit through the driving circuit.
Preferably, in the controller circuit, the sampled output voltage and the sampled output current are subjected to a third operator to generate a control value V8, and the control value V5 and the control value V8 are subjected to a second operator to generate the control value V6.
The operation of the third operator is a multiplication operation, that is, the output value of the third operator is the product value of two input values of the third operator.
As a preferred technical solution, the controller is a digital signal processor.
As a preferred technical solution, when the dc/dc conversion circuit is a conversion circuit with transformer isolation and the ground level of the controller is the secondary ground level, the primary current generates a primary current sampling value through the third sampling circuit, and in the controller circuit, the primary current sampling value is converted into the output current sampling value.
As a preferred technical solution, when the dc/dc conversion circuit is a conversion circuit with transformer isolation and the ground level of the controller is a secondary side ground level, the first sampling circuit is an isolation sampling circuit; when the direct current/direct current conversion circuit is a conversion circuit with transformer isolation and the ground level of the controller is the primary ground level, the second sampling circuit and the third sampling circuit are isolation sampling circuits, and the driving circuit is an isolation driving circuit.
The utility model has the advantages that: 1) when the load requirement is larger than the maximum output capacity of the module under the condition of input voltage at the moment, the module voltage outer ring is switched to newly-added bus voltage closed-loop control, so that the bus voltage stably works at another stable bus voltage value, the bus voltage is lower than the minimum value of the bus voltage during the stable work and is between the minimum value of the bus voltage during the stable work and the bus under-voltage value, the rear-stage DC/DC circuit can still keep certain power output, and the output working range of the power converter is expanded.
2) When the load changes dynamically, the nonlinear operation of the front PFC part can be reduced, and the rear control loop can be switched smoothly between the two loops according to the actual load capacity of the bus, so that the voltage stability of the bus is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a first schematic diagram of the process of the present invention;
FIG. 2 is a second schematic of the method of the present invention;
FIG. 3 is a third schematic of the method of the present invention;
FIG. 4 is a circuit diagram of a first embodiment of the method apparatus of the present invention;
FIG. 5 is a circuit diagram of a second embodiment of the method apparatus of the present invention;
fig. 6 is a circuit diagram of a third embodiment of the method and apparatus of the present invention.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example 1:
as shown in fig. 1-4, the power converter is composed of a controller 1, an ac/dc conversion circuit 2, a bus capacitor 3, a dc/dc conversion circuit 4, a first sampling circuit, a second sampling circuit, a driving circuit, and the like, wherein the controller 1 is a Digital Signal Processor (DSP).
The input end of a power converter device is connected with the input end of the alternating current/direct current conversion circuit 2, the output end of the alternating current/direct current conversion circuit is connected with the input end of the direct current/direct current conversion circuit 4 in parallel through a bus capacitor 3, the output end of the direct current/direct current conversion circuit 4 is connected with the output end of the power converter device, bus capacitor voltage generates a bus voltage sampling value through the first sampling circuit, output voltage obtains an output voltage sampling value through the second sampling circuit, the bus voltage sampling value and the output voltage sampling value are sent to an AD port of the controller 1, and the controller 1 controls generation of a driving signal through a driving circuit to control the on and off of a switch tube in the direct current/direct current converter 4.
In the circuit of the controller 1, a bus voltage set value and a bus voltage sampling value generate a control value V1 after passing through a second arithmetic unit 12, and the control value V1 generates a control value V2 through a first negative feedback compensation regulator 13; the control value V3 is generated after the output voltage set value and the output voltage sampling value pass through the second arithmetic unit, the control value V3 passes through the second negative feedback compensation regulator 14 to generate a control value V4, the control value V2 and the control value V4 pass through the first arithmetic unit 11 to generate a control value V5, the control value V5 passes through the signal generator 15 to generate a driving signal, and the driving signal is sent to the driving circuit to control the on-off of a switching tube in the DC/DC conversion circuit.
The operation of the first operator 11 is a small operation, that is, the output value of the first operator 11 is the minimum value of the two input values of the first operator 11.
The operation of the second operator 12 is a difference operation, i.e. the output value of the second operator 12 is the difference between two input values of the second operator 12.
And the given value of the bus voltage is smaller than the minimum value of the bus voltage of the power converter during steady-state operation.
Example 2:
fig. 5 is a circuit diagram of a power converter control method and a power converter control apparatus according to a first embodiment of the present invention. The power converter comprises a controller 1, an alternating current/direct current conversion circuit 2, a bus capacitor 3, a direct current/direct current conversion circuit 4, a first sampling circuit, a second sampling circuit, a third sampling circuit, a driving circuit and the like, wherein the controller 1 is a Digital Signal Processor (DSP).
The input end of a power converter device is connected with the input end of the alternating current/direct current conversion circuit 2, the output end of the alternating current/direct current conversion circuit is connected with the input end of the direct current/direct current conversion circuit 4 in parallel through a bus capacitor 3, the output end of the direct current/direct current conversion circuit 4 is connected with the output end of the power converter device, bus capacitor voltage generates a bus voltage sampling value through the first sampling circuit, the output voltage obtains an output voltage sampling value through the second sampling circuit, the bus voltage sampling value and the output voltage sampling value are sent to an AD port of the controller 1, and the controller 1 controls generation of a driving signal through a driving circuit to control on and off of a switching tube in the direct current/direct current converter 4.
In the circuit of the controller 1, the set value of the bus voltage and the sampled value of the bus voltage pass through the second arithmetic unit 12 to generate a control value V1, and the control value V1 passes through the first negative feedback compensation regulator 13 to generate a control value V2; the control value V3 is generated after the set value of the output voltage and the sampling value of the output voltage pass through the second arithmetic device, the control value V3 generates the control value V4 through the second negative feedback compensation regulator 14, the control value V2 and the control value V4 generate the control value V5 through the first arithmetic device 11, the control value V5 and the sampling value of the output current pass through the second arithmetic device 12 to generate the control value V6, the control value V6 generates the control value V7 through the third negative feedback compensation regulator 16, the control value V7 generates the driving signal through the signal generator 17, and the driving signal controls the on and off of the switching tube in the DC/DC conversion circuit through the driving circuit.
The operation of the first operator 11 is a small operation, that is, the output value of the first operator 11 is the minimum value of the two input values of the first operator 11.
The operation of the second operator 12 is a difference operation, i.e. the output value of the second operator 12 is the difference between two input values of the second operator 12.
And the given value of the bus voltage is smaller than the minimum value of the bus voltage of the power converter during steady-state operation.
Example 3:
fig. 6 is a circuit diagram of a power converter control method and a device thereof according to a first embodiment of the present invention. The power converter comprises a controller 1, an alternating current/direct current conversion circuit 2, a bus capacitor 3, a direct current/direct current conversion circuit 4, a first sampling circuit, a second sampling circuit, a third sampling circuit, a driving circuit and the like, wherein the controller 1 is a Digital Signal Processor (DSP).
The input end of the power converter device is connected with the input end of the alternating current/direct current conversion circuit 2, the output end of the alternating current/direct current conversion circuit is connected with the input end of the direct current/direct current conversion circuit 4 in parallel through a bus capacitor 3, the output end of the direct current/direct current conversion circuit 4 is connected with the output end of the power converter device, bus capacitor voltage generates a bus voltage sampling value through the first sampling circuit, output voltage obtains an output voltage sampling value through the second sampling circuit, the bus voltage sampling value and the output voltage sampling value are sent to an AD port of the controller 1, and the controller 1 controls to generate a driving signal through a driving circuit in a closed-loop control mode to control the on and off of a switching tube in the direct current/direct current converter 4.
In the circuit of the controller 1, the set value of the bus voltage and the sampled value of the bus voltage pass through the second arithmetic unit 12 to generate a control value V1, and the control value V1 passes through the first negative feedback compensation regulator 13 to generate a control value V2; the control value V3 is generated after the set value of the output voltage and the sampled value of the output voltage pass through the second arithmetic unit, the control value V3 generates the control value V4 through the second negative feedback compensation regulator 14, the control value V2 and the sampled value of the control value V4 generate the control value V5 through the first arithmetic unit 11, the sampled value of the output voltage and the sampled value of the output current pass through the third arithmetic unit 17 to generate the control value V8, the control value V5 and the control value V8 generate the control value V6 through the second arithmetic unit, the control value V6 generates the control value V7 through the third negative feedback compensation regulator 16, the control value V7 generates the driving signal through the signal generator 15, and the driving signal controls the on and off of the switching tube in the dc/dc conversion circuit through the driving circuit.
The operation of the first operator 11 is a small operation, that is, the output value of the first operator 11 is the minimum value of the two input values of the first operator 11.
The operation of the second operator 12 is a difference operation, i.e. the output value of the second operator 12 is the difference between two input values of the second operator 12.
The operation of the third operator is a multiplication operation, i.e. the output value of the third operator is the product of two input values of the third operator.
And the given value of the bus voltage is smaller than the minimum value of the bus voltage of the power converter during steady-state operation.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the creative work should be covered within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.
Claims (4)
1. A power converter apparatus, characterized in that: the DC/DC converter comprises an AC/DC conversion circuit, a bus capacitor, a DC/DC conversion circuit, a first sampling circuit, a second sampling circuit and a drive circuit, wherein the input end of the power converter device is connected with the input end of the AC/DC conversion circuit, the output end of the AC/DC conversion circuit is connected with the input end of the DC/DC conversion circuit in parallel through the bus capacitor, the output end of the DC/DC conversion circuit is connected with the output end of the power converter device, the voltage of the bus capacitor generates a bus voltage sampling value through the first sampling circuit, the output voltage obtains an output voltage sampling value through the second sampling circuit, the bus voltage sampling value and the output voltage sampling value are sent to a controller circuit, and the controller controls the generation of a drive signal through the drive circuit to control the opening and closing of a switching tube in the DC/DC converter Breaking;
the output current passes through the third sampling circuit to obtain an output current sampling value, in the controller circuit, the control value V5 and the output current sampling value pass through a second arithmetic unit to generate a control value V6, the control value V6 passes through a third negative feedback compensation regulator to generate a control value V7, the control value V7 passes through a signal generator to generate a driving signal, and the driving signal controls the on and off of a switching tube in the DC/DC conversion circuit through the driving circuit;
in the controller circuit, the output voltage sample value and the output current sample value generate a control value V8 through a third operator, and the control value V5 and the control value V8 generate the control value V6 through a second operator;
the operation of the third operator is a multiplication operation, that is, the output value of the third operator is the product value of two input values of the third operator.
2. The power converter device of claim 1, wherein: the controller is a digital signal processor.
3. The power converter device of claim 1, wherein: when the direct current/direct current conversion circuit is a conversion circuit with transformer isolation and the ground level of the controller is the secondary side ground level, the primary side current generates a primary side current sampling value through the third sampling circuit, and the primary side current sampling value is converted into the output current sampling value in the controller circuit.
4. The power converter device of claim 1, wherein: when the direct current/direct current conversion circuit is a conversion circuit with transformer isolation and the ground level of the controller is the secondary side ground level, the first sampling circuit is an isolation sampling circuit; when the direct current/direct current conversion circuit is a conversion circuit with transformer isolation and the ground level of the controller is the primary ground level, the second sampling circuit and the third sampling circuit are isolation sampling circuits, and the driving circuit is an isolation driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821212873.9U CN209948984U (en) | 2018-07-27 | 2018-07-27 | Power converter device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821212873.9U CN209948984U (en) | 2018-07-27 | 2018-07-27 | Power converter device |
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| CN209948984U true CN209948984U (en) | 2020-01-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108696156A (en) * | 2018-07-27 | 2018-10-23 | 深圳英飞源技术有限公司 | A kind of control method and its device of supply convertor |
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- 2018-07-27 CN CN201821212873.9U patent/CN209948984U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108696156A (en) * | 2018-07-27 | 2018-10-23 | 深圳英飞源技术有限公司 | A kind of control method and its device of supply convertor |
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