CN210075106U - Power module and power system - Google Patents
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- CN210075106U CN210075106U CN201920345883.8U CN201920345883U CN210075106U CN 210075106 U CN210075106 U CN 210075106U CN 201920345883 U CN201920345883 U CN 201920345883U CN 210075106 U CN210075106 U CN 210075106U
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Abstract
The utility model discloses a power module and electrical power generating system, power module includes: an output current feedback control circuit; a first output of the output rectifying and filtering unit is used as a first output (DC +) of the power module, a second output (VS) of the output rectifying and filtering unit is connected with one end of a current sampling resistor (R101) and is connected with an input of the output current feedback unit, and the other end of the current sampling resistor (R101) is used as a second output (DC-) of the power module; and a second output (VS) of the output rectifying and filtering unit is connected with the input of the output current feedback unit, a first output (VC) of the output current feedback unit is connected with the input of the output voltage feedback unit, and a second output (VA) of the output current feedback unit is used as a third output (VA) of the power module. The utility model discloses both realized the parallel operation function of flow equalizing, made output voltage's fluctuation again in controllable within range.
Description
Technical Field
The utility model relates to a power technical field especially relates to a power module and electrical power generating system.
Background
In the power module with the automatic current equalizing function in the prior art, an output voltage feedback unit and an output current feedback unit are simultaneously connected to a feedback optical coupler. The disadvantages of such a connection are: at any moment, only one of the two feedback loops takes over to control the feedback optocoupler, when the output current of the output current feedback unit passes through the feedback optocoupler, no current flows to the feedback optocoupler by the output voltage feedback unit, and the output voltage is in an uncontrollable state; when the load is a non-constant voltage (such as a storage battery) load, the fluctuation range of the output voltage of the power supply module may be too large. Therefore, the circuit can only be applied to the intelligent fields of communication, electric power, servers and the like with a central monitor and the industrial field with an energy storage battery, and cannot be applied to the common industrial field.
Accordingly, the prior art is yet to be improved and developed.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a power module and electrical power generating system are provided for its output voltage is controllable, reliable, and the wide application is in each industrial field.
The utility model provides a technical scheme that technical problem adopted as follows:
a power supply module, comprising:
the power supply control and drive unit comprises an input rectification filter unit, a voltage conversion isolation unit, an output rectification filter unit, an output voltage feedback unit, a feedback isolation unit and a power supply control and drive unit which are sequentially connected, wherein the output of the power supply control and drive unit is connected to the voltage conversion isolation unit;
it also includes an output current feedback unit;
a first output of the output rectifying and filtering unit is used as a first output (DC +) of the power module, a second output (VS) of the output rectifying and filtering unit is connected with one end of a current sampling resistor (R101) and is connected with an input of the output current feedback unit, and the other end of the current sampling resistor (R101) is used as a second output (DC-) of the power module;
and a second output (VS) of the output rectifying and filtering unit is connected with the input of the output current feedback unit, a first output (VC) of the output current feedback unit is connected with the input of the output voltage feedback unit, and a second output (VA) of the output current feedback unit is used as a third output (V0) of the power module.
Preferably, the output current feedback unit comprises a current signal sampling circuit and a comparison and adjustment circuit;
the current signal sampling circuit is used for inverting and amplifying the value of a second output (VS) of the output rectifying and filtering unit to obtain a second output (VA) of the output current feedback unit and an output (VB) of the current signal sampling circuit;
the comparison and regulation circuit is used for comparing and proportionally regulating the second output (VA) of the output current feedback unit and the output (VB) of the current signal sampling circuit to obtain the first output (VC) of the output current feedback unit, obtaining feedback Voltage (VFB) by connecting a third resistor (R3) in series, and the feedback Voltage (VFB) is connected to the input of the output voltage feedback unit.
Preferably, the current signal sampling circuit includes a first operational amplifier (IC1A), and the comparison adjustment circuit includes a second operational amplifier (IC 1B).
Preferably, the output current feedback unit further comprises a maximum current limiting circuit for limiting a maximum value of a second output (VA) of the output current feedback unit;
the maximum current limiting circuit comprises an operational amplifier (IC3) of a third built-in reference voltage and two resistors, a second output (VA) of the output current feedback unit is connected to the ground through two eighteenth resistors (R18) and a nineteenth resistor (R19) which are connected in series, and a reference voltage end of an output of the operational amplifier (IC3) of the third built-in reference voltage is connected with the upper end of the nineteenth resistor (R19).
Preferably, the feedback isolation unit comprises an optical coupler, the output of the output voltage feedback unit is connected with a light emitting side (OP1A) of the optical coupler, and a light receiving side (OP1B) of the optical coupler is connected with the power control and drive unit.
Preferably, the output voltage feedback unit includes an operational amplifier (IC2) of a second built-in reference voltage and three resistors, the first output (DC +) of the power module is connected to ground through a sixth resistor (R6), a variable resistor (RV1) and a fifth resistor (R5), and the reference voltage output by the operational amplifier (IC2) of the second built-in reference voltage is connected to the upper end of the variable resistor (RV 1).
Preferably, another output of the operational amplifier (IC2) of the second built-in reference voltage is connected to a light emitting side (OP1A) of the optical coupler as an output of the output voltage feedback unit.
Preferably, the output voltage feedback unit has three inputs, and a first output (DC +) of the power supply module and a second output (DC-) of the power supply module are used as two inputs of the output voltage feedback unit; the feedback Voltage (VFB) is connected to the upper end of the variable resistor (RV1) of the output voltage feedback unit as a third input of the output voltage feedback unit.
The utility model also provides a power supply system, it includes a plurality of parallelly connected power module as described above, all power module's first output (DC +) links together, all power module's second output (DC-) links together, all power module's third output (V0) links together.
Preferably, the first output (DC +) of the power module and the second output (DC-) of the power module are adapted to provide DC power to a load.
Compared with the prior art, the embodiment of the application mainly has the following beneficial effects:
this application is owing to be connected output and output voltage feedback unit's input with output current feedback unit's output, output voltage feedback unit's output with be connected the isolation unit and be connected, the power is during operation like this, because only output voltage feedback unit direct action is in the isolation unit, output current feedback unit comes the output voltage of indirect control power through control output voltage feedback unit, make the output voltage of power can adjust at certain extent, the parallel operation function of flow equalizing has both been realized like this, make power output voltage's fluctuation within controllable range again, simultaneously, it can be applied to in taking fixed binding post's high frequency switch industrial power supply, use very extensively.
Drawings
In order to illustrate the solution of the present application more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a block diagram of a power module according to a preferred embodiment of the present invention.
Fig. 2 is a circuit diagram of the current signal sampling of the output current feedback unit in the preferred embodiment of the power module of the present invention.
Fig. 3 is a comparative regulating circuit diagram of the output current feedback unit in the preferred embodiment of the power module of the present invention.
Fig. 4 is a circuit diagram of the maximum current limiting circuit of the output current feedback unit in the preferred embodiment of the power module of the present invention.
Fig. 5 is a circuit diagram of an output voltage feedback unit in a preferred embodiment of the power module of the present invention.
Fig. 6 is a block diagram of a preferred embodiment of the power supply system of the present invention.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
As shown in fig. 1, the preferred embodiment of the present invention provides a power module, which comprises an input rectifying and filtering unit 10, a voltage converting and isolating unit 20, an output rectifying and filtering unit 40, an output voltage feedback unit 50, a feedback isolating unit, a power control and driving unit 30 and an output current feedback unit 60, which are sequentially connected in sequence, wherein the output of the power control and driving unit 30 is connected to the voltage converting and isolating unit 20; a first output of the output rectifying and filtering unit 40 is used as a first output (DC +) of the power module, a second output (VS) of the output rectifying and filtering unit 40 is connected to one end of a current sampling resistor (R101) and is connected to an input of the output current feedback unit 60, and the other end of the current sampling resistor (R101) is used as a second output (DC-) of the power module; the second output (VS) of the output rectifying and filtering unit 40 is connected to the input of the output current feedback unit 60, the first output (VC) of the output current feedback unit 60 is connected to the input of the output voltage feedback unit 50, and the second output (VA) of the output current feedback unit 60 is used as the third output (V0) of the power module.
The working principle of the power supply module is as follows: when the detected output voltage of a certain power module is less than the maximum output voltage of the current-sharing signals of all the parallel power modules, the first output (VC) of the output current feedback unit 60 also drops, and the first output (VC) is regulated by the PID of the output voltage feedback unit 50, so as to control the feedback isolation unit and the power control and drive unit 30, finally, the output voltage of the single power module rises, and the output current also rises, and finally, the purpose of adjusting the current of the single power module is achieved.
In a further preferred embodiment of the present invention, the output current feedback unit 60 includes a current signal sampling circuit (as shown in fig. 2) and a comparison and adjustment circuit (as shown in fig. 3); the current signal sampling circuit is configured to invert and amplify a value of a second output (VS) of the output rectifying and filtering unit 40 to obtain a second output (VA) of the output current feedback unit 60 and an output (VB) of the current signal sampling circuit; the comparison and regulation circuit is used for comparing and proportionally regulating the second output (VA) (which is the maximum value of current-sharing signals of all parallel power supply modules) of the output current feedback unit 60 and the output (VB) (the output voltage of a single power supply module) of the current signal sampling circuit to obtain the first output (VC) of the output current feedback unit, and obtaining a feedback Voltage (VFB) by connecting a third resistor (R3) in series, wherein the feedback Voltage (VFB) is connected to the input of the output voltage feedback unit.
Since the current sampling resistor (R101) is connected between the first output (DC +) of the power module and the second output (VS) of the output rectifying and filtering unit 40, the output current generates a voltage drop on the resistor R101, and the voltage drop is proportional to the output current. The voltage value between the second output (VS) and ground (SGND) is a weak negative voltage due to the power limitation of the current sampling resistor (R101). A weak negative voltage between the second output (VS) to ground is scaled up and inverted through the current signal sampling circuit. The output voltage of the current signal sampling circuit generates a 'VA' signal after passing through the diode D11 and the resistor R13, and generates a 'VB' signal after passing through the diode D12 and the resistor R14.
The output voltage 'VB' signal of the single power supply module and the maximum output voltage 'VA' signal in the parallel power supply modules are compared and PID-regulated by a second operational amplifier (IC1B), and the output signal (VC) of the second operational amplifier (IC1B) is connected to the VFB node of the output voltage feedback unit through a third resistor R3.
PID regulation (PID regulation) is a basic regulation mode of a control system in a classical control theory and has a linear regulation rule with proportional, integral and differential functions.
The proportion regulation function is as follows: is the deviation of a proportional reaction system, and once the deviation occurs in the system, the proportional adjustment immediately generates an adjusting effect to reduce the deviation. The proportion is large, so that the adjustment can be accelerated, and the error can be reduced, but the stability of the system is reduced and even the system is unstable due to the overlarge proportion.
Integral adjustment action: the system eliminates steady state error and improves the tolerance. Because of the error, the integral adjustment is carried out until no difference exists, the integral adjustment is stopped, and the integral adjustment outputs a constant value. The strength of the integral action depends on an integral time constant T, the smaller the T is, the stronger the integral action is, otherwise, the larger the T is, the weaker the integral action is, and the stability of the system can be reduced and the dynamic response is slowed down by adding integral adjustment. The integration is often combined with two other regulation laws to form a PI regulator or a PID regulator.
Differential regulation action: the derivative effect reflects the rate of change of the system deviation signal, has predictability, and can predict the trend of deviation change, so that the control effect can be generated in advance, and before the deviation is formed, the control effect is eliminated by the derivative regulation effect. Thus, the dynamic performance of the system can be improved. Under the condition that the selection of the differential time is proper, the overshoot can be reduced, and the adjusting time can be reduced. The differential action has amplification effect on noise interference, so that too strong differential regulation is unfavorable for the interference resistance of the system. In addition, the derivative reacts to the rate of change, and when there is no change in the input, the derivative effect output is zero. The differential action cannot be used alone and needs to be combined with two other regulation laws to form a PD or PID controller.
In a further preferred embodiment of the present invention, the output current feedback unit 60 further comprises a maximum current limiting circuit (as shown in fig. 4) for limiting the maximum value of the second output (VA) of the output current feedback unit; the maximum current limiting circuit comprises an operational amplifier (IC3) of a third built-in reference voltage and two resistors, a second output (VA) of the output current feedback unit is connected to the ground through two eighteenth resistors (R18) and a nineteenth resistor (R19) which are connected in series, and a reference voltage end of an output of the operational amplifier (IC3) of the third built-in reference voltage is connected with the upper end of the nineteenth resistor (R19).
As shown in fig. 4, a maximum current limiting circuit is added between the second output (VA) of the output current feedback unit 60 and ground. The circuit limits the maximum voltage value between the second output (VA) and ground through an operational amplifier (IC 3). When the voltage value between the second output (VA) and ground is greater than the set value, the operational amplifier (IC3) limits its voltage value to the set value through the impedance between the second output (VA) and ground. Examples are as follows:
when the built-in reference voltage of the operational amplifier (IC3) in fig. 4 is 2.5V, the maximum value of the output current "I _ OUT" of a single power supply block is calculated by the formula:
VS＝VA
because the voltage value between the second output (VA) and the ground is in a proportional relation with the output current of the power supply module, the maximum output current of the power supply module is limited, and each power supply module in a parallel system of a plurality of power supply modules works below a safe power value.
The maximum current limiting circuit samples, regulates and limits the maximum value of the VA voltage through a third operational amplifier (IC3) with built-in reference voltage, so that the maximum value of the VS voltage is limited, and the maximum output current of the power module is finally limited because the VS voltage value is in a proportional relation with the output current of the power module.
In a further preferred embodiment of the present invention, as shown in fig. 1, the feedback isolation unit comprises an optical coupler, the output of the output voltage feedback control circuit 50 is connected to the light emitting side (OP1A) of the optical coupler, and the light receiving side (OP1B) of the optical coupler is connected to the power control and driving unit 30.
In a further preferred embodiment of the present invention, as shown in fig. 5, the output voltage feedback unit 50 includes an operational amplifier (IC2) with a second built-in reference voltage and three resistors, the first output (DC +) of the power module is connected to the ground through a sixth resistor (R6), a variable resistor (RV1) and a fifth resistor (R5), and the reference voltage output by the operational amplifier (IC2) with the second built-in reference voltage is connected to the upper end of the variable resistor (RV 1); the other output of the operational amplifier (IC2) with the second built-in reference voltage is connected to the light emitting side (OP1A) of the optical coupler as the output (VD) of the output voltage feedback control circuit 50.
The output voltage feedback unit has three inputs, and a first output (DC +) of the power supply module and a second output (DC-) of the power supply module are used as two inputs of the output voltage feedback unit; the feedback Voltage (VFB) is connected to the upper end of the variable resistor (RV1) of the output voltage feedback unit as a third input of the output voltage feedback unit.
The first output (VC) of the output current feedback unit 60 is connected to the input terminal (VFB) of the output voltage feedback unit 50 through the third resistor (R3), and the influence depth of the output current feedback unit 60 on the output voltage feedback unit 50 is controlled by adjusting the third resistor (R3). Examples are as follows:
as shown in fig. 3, when "VCCS" is 12V, the second operational amplifier (IC1B) has a maximum output voltage of 11.7V at pin 7 when not in parallel (single operation); as shown in fig. 5, the internal reference voltage of the second internal reference voltage operational amplifier (IC2) is 2.5V, and the "DC +" voltage of the power module is calculated according to the principle that the current flowing into the VFB node is constant with the current flowing out of the VFB node:
the present invention also provides a power system, as shown in fig. 6, the power system comprises a plurality of parallel power modules, wherein the first outputs (DC +) of all power modules are connected together, the second outputs (DC-) of all power modules are connected together, the third outputs (V0) of all power modules are connected together, and the first outputs (DC +) of the power modules and the second outputs (DC-) of the power modules are used for providing DC power for the load.
When the first output (DC +), the second output (DC-), and the third output (VA) of a plurality of identical power modules are connected together, due to the function of the diode D11, after the plurality of identical power modules are connected in parallel, the voltage value between the "VA" of one power module and the ground becomes larger, and the "VA" of the power module is the maximum value of the "VA" of the power system output.
When a plurality of power supply modules are connected in parallel to form a power supply system, if the output voltage VB of other single power supply modules of the power supply system is less than the maximum output voltage VA of the power supply system, the pin 7 voltage of the second operational amplifier (IC1B) reaches the minimum value of 0.3V. At this time, "DC +" of the other single power supply module will rise, eventually making the output voltages VB and VA of the other single power supply module equal. The calculation formula of the 'DC +' of the power supply module is as follows:
the calculation formula of the maximum adjustable voltage of a single power module in the power system is as follows:
ΔV＝[DC+(2)]-[DC+(1)]
by this formula, the maximum adjustable voltage of the single power supply module in the power supply system can be set by the sixth resistor R6 and the third resistor R3, so that the output voltage is controllable. The risk of power supply output voltage runaway existing in the parallel current sharing circuit in the prior art can not occur.
At a total load <1100W,10 power modules of 100W are connected in parallel and rated full and half load tests are performed. The test results are as follows: the unbalance degree of the current sharing is less than +/-5 percent, and the use requirement is met. When the power supply system is used for carrying out dynamic load and on-off test, the fluctuation amplitude of the output voltage is less than +/-5 percent, and the specification requirement is met.
The utility model discloses need not connect central controller, need not be at secondary side direct current voltage output termination energy storage battery. The LED display screen can be applied to more extensive common industrial fields of large-scale mechanical equipment, LED display, self-service vending equipment and the like.
Furthermore, the utility model provides a power module and electrical power generating system can be applied to arbitrary outward appearance, structural style's high frequency switch power supply in, also can realize in arbitrary printed wiring board overall arrangement connected mode.
The components in the power module can be any packaged components with the same principle performance, and the series connection and parallel connection combination of the components.
To sum up, the present invention provides a power module and a power system, wherein the output end of the output current feedback unit is connected to the input end of the output voltage feedback unit, and the output end of the output voltage feedback unit is connected to the connection isolation unit, so that when the power supply is in operation, only the output voltage feedback unit directly acts on the isolation unit, and the output current feedback unit indirectly controls the output voltage of the power supply by controlling the output voltage feedback unit, so that the output voltage of the power supply can be adjusted within a certain range, thereby achieving the parallel current sharing function and the fluctuation of the power supply output voltage within the controllable range, and simultaneously, the maximum output current of the power module can be displayed due to the maximum current limiting circuit added in the output current feedback unit, besides, the power module can be applied to the high frequency switch industrial power supply with fixed terminals, the application is wide.
It is to be understood that the above-described embodiments are merely illustrative of some, but not restrictive, of the broad invention, and that the appended drawings illustrate preferred embodiments of the invention and do not limit the scope of the invention. This application is capable of embodiments in many different forms and is provided for the purpose of enabling a thorough understanding of the disclosure of the application. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that the present application may be practiced without modification or with equivalents of some of the features described in the foregoing embodiments. All equivalent structures made by using the contents of the specification and the drawings of the present application are directly or indirectly applied to other related technical fields and are within the protection scope of the present application.
Claims (10)
1. A power supply module comprising: the power supply module comprises an input rectification filter unit, a voltage conversion isolation unit, an output rectification filter unit, an output voltage feedback unit, a feedback isolation unit and a power supply control and drive unit which are sequentially connected, wherein the output of the power supply control and drive unit is connected to the voltage conversion isolation unit;
a first output of the output rectifying and filtering unit is used as a first output (DC +) of the power module, a second output (VS) of the output rectifying and filtering unit is connected with one end of a current sampling resistor (R101) and is connected with an input of the output current feedback unit, and the other end of the current sampling resistor (R101) is used as a second output (DC-) of the power module;
and a second output (VS) of the output rectifying and filtering unit is connected with the input of the output current feedback unit, a first output (VC) of the output current feedback unit is connected with the input of the output voltage feedback unit, and a second output (VA) of the output current feedback unit is used as a third output (V0) of the power module.
2. The power supply module of claim 1, wherein the output current feedback unit includes a current signal sampling circuit and a comparison adjustment circuit;
the current signal sampling circuit is used for inverting and amplifying the value of a second output (VS) of the output rectifying and filtering unit to obtain a second output (VA) of the output current feedback unit and an output (VB) of the current signal sampling circuit;
the comparison and regulation circuit is used for comparing and proportionally regulating the second output (VA) of the output current feedback unit and the output (VB) of the current signal sampling circuit to obtain the first output (VC) of the output current feedback unit, obtaining feedback Voltage (VFB) by connecting a third resistor (R3) in series, and the feedback Voltage (VFB) is connected to the input of the output voltage feedback unit.
3. The power supply module of claim 2, wherein the current signal sampling circuit comprises a first operational amplifier (IC1A) and the compare adjust circuit comprises a second operational amplifier (IC 1B).
4. A power supply module according to claim 2, wherein the output current feedback unit further comprises a maximum current limiting circuit for limiting a maximum value of the second output (VA) of the output current feedback unit;
the maximum current limiting circuit comprises an operational amplifier (IC3) of a third built-in reference voltage and two resistors, a second output (VA) of the output current feedback unit is connected to the ground through two eighteenth resistors (R18) and a nineteenth resistor (R19) which are connected in series, and a reference voltage end of an output of the operational amplifier (IC3) of the third built-in reference voltage is connected with the upper end of the nineteenth resistor (R19).
5. A power supply module according to claim 2, wherein the feedback isolation unit comprises an optocoupler, wherein the output of the output voltage feedback control circuit is connected to a light emitting side (OP1A) of the optocoupler, and wherein a light receiving side (OP1B) of the optocoupler is connected to the power supply control and drive unit.
6. The power module as claimed in claim 5, wherein the output voltage feedback unit includes an operational amplifier (IC2) of a second built-in reference voltage and three resistors, the first output (DC +) of the power module is connected to ground through a sixth resistor (R6), a variable resistor (RV1) and a fifth resistor (R5), and the reference voltage output by the operational amplifier (IC2) of the second built-in reference voltage is connected to the upper end of the variable resistor (RV 1).
7. A power supply module according to claim 6, characterized in that the other output of the operational amplifier (IC2) of the second built-in reference voltage is connected to the light emitting side (OP1A) of the optocoupler as the output of the output voltage feedback control circuit.
8. A power supply module according to claim 6, characterized in that the output voltage feedback unit has three inputs, a first output (DC +) of the power supply module and a second output (DC-) of the power supply module being two inputs of the output voltage feedback unit; the feedback Voltage (VFB) is connected to the upper end of the variable resistor (RV1) of the output voltage feedback unit as a third input of the output voltage feedback unit.
9. A power supply system, characterized in that it comprises a plurality of parallel connected power supply modules according to any of claims 1-8, the first outputs (DC +) of all power supply modules being connected together, the second outputs (DC-) of all power supply modules being connected together, and the third outputs (V0) of all power supply modules being connected together.
10. The power system of claim 9, wherein the first output (DC +) of the power module and the second output (DC-) of the power module are for providing DC power to a load.
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| CN110212788A (en) * | 2019-03-19 | 2019-09-06 | 深圳市航嘉驰源电气股份有限公司 | A kind of power module and power-supply system |
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| CN110212788A (en) * | 2019-03-19 | 2019-09-06 | 深圳市航嘉驰源电气股份有限公司 | A kind of power module and power-supply system |
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