CN108121200A - A kind of power supply and its isolation digital control circuit and method - Google Patents
A kind of power supply and its isolation digital control circuit and method Download PDFInfo
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Abstract
The invention belongs to switch power technology fields, provide a kind of power supply and its isolation digital control circuit and method.In the present invention, first comparison module exports the first difference to the first compensating module after electrical parameter values and target electrical parameter values are made difference, first compensating module is amplified the first difference after compensation and is exported by isolating device to control device, control device carries out analog-to-digital conversion with being sent to isolating device after pulse width modulation by the first difference after compensating is amplified, isolating device is adjusted the output of controll plant according to the first difference after pulse width modulation, so that the electrical parameter values convergence target electrical parameter values of controll plant output.What is gathered due to the present invention is difference between the electrical parameter values of controll plant and target electrical parameter values, and compensation is amplified difference using the first compensating module, therefore, isolating device, which may be employed, normally isolates device realization, the cost of isolation digital control circuit is thereby reduced, increases bandwidth.
Description
Technical field
The invention belongs to switch power technology field more particularly to a kind of power supply and its isolation digital control circuit and sides
Method.
Background technology
It is digital control because it is insensitive to environment, software programmable, solution flexibly, can be achieved non-linear and multivariable
Etc. senior control functions, can realize multiple closed-loop controls and peripheral cell quantity can be reduced and failure predication etc. can be carried out
Function has been more and more widely used in the power supply products such as communication and server.
It is digital control be broadly divided into it is non-isolated it is digital control with isolate it is digital control.It is non-isolated digital control mainly to defeated
Go out voltage value, current value or performance number and directly carry out analog-to-digital conversion to obtain corresponding digital signal, and with given reference value ratio
Compared with, and the error drawn is compensated by digital PID (Proportion-Integral-Derivative, proportional integral differential)
PWM (Pulse Width Modulation, pulse width modulation) is controlled afterwards, and then is changed the gain of controll plant and must be expired
The output of prestige.However, due to existing power supply product mainly using isolate it is digital control, it is non-isolated it is numerically controlled should
It is relatively limited with scope.
At present, mainly application isolation is digital control for power supply product, and digital control isolation is in non-isolated numerically controlled base
Isolating device is added on plinth, isolating device includes isolation drive and linear isolation, and isolation drive uses transformer or isolation
Driving chip realizes that isolation drive signal is alternating-current pulse, but since linear isolation needs to avoid output signal as far as possible
Distortion, therefore, linear isolation have higher requirements to the linearity, bandwidth and environmental sensitivity, main using logical currently on the market
Linear optical coupling realizes linear isolation, and linear optical coupling is with high costs, and linear optical coupling to isolate numerically controlled band
Width reduces.
In conclusion it is existing isolation it is digital control there are of high cost and bandwidth it is low the problem of.
The content of the invention
It is an object of the invention to provide a kind of power supply and isolation digital control circuits and method, it is intended to solve it is existing every
From it is digital control there are of high cost and bandwidth it is low the problem of.
The present invention is achieved in that a kind of isolation digital control circuit, and the isolation digital control circuit includes control
Device, isolating device, the first compensating module, the first comparison module and controll plant；
The output terminal of the control device is connected with the first input end of the isolating device, and the first of the isolating device
Output terminal is connected with the input terminal of the controll plant, the output terminal of the controll plant and the first of first comparison module
Input terminal connects, and exports electrical parameter values, and the second input terminal of first comparison module receives target electrical parameter values, and described the
The output terminal of one comparison module is connected with the input terminal of first compensating module, the output terminal of first compensating module and institute
State the second input terminal connection of isolating device, the second output terminal of the isolating device and the first input end of the control device
Connection；
The electrical parameter values and the target electrical parameter values are carried out exporting after difference operation the by first comparison module
One difference to first compensating module, first compensating module is amplified first difference after compensation by described
Isolating device is exported to the control device, and the control device carries out analog-to-digital conversion and arteries and veins by the first difference after compensating is amplified
The isolating device is sent to after rushing width modulated, the isolating device is according to the first difference after pulse width modulation to described
The output of controll plant is adjusted, so that the electrical parameter values of controll plant output are equal to the target electrical parameter values.
It is an object of the invention to provide a kind of isolation digital control circuit, the isolation digital control circuit includes control
Device, isolating device, the first compensating module, the first comparison module and controll plant；
The output terminal of the control device is connected with the first input end of the isolating device, and the first of the isolating device
Output terminal is connected with the input terminal of the controll plant, the output terminal of the controll plant and the first of first comparison module
Input terminal connects, and exports electrical parameter values, and the second input terminal of first comparison module receives target electrical parameter values, and described the
The output terminal of one comparison module is connected with the input terminal of first compensating module, the output terminal of first compensating module and institute
State the second input terminal connection of isolating device, the second output terminal of the isolating device and the first input end of the control device
Connection, the second input terminal of the control device receive electric value value；
The electrical parameter values and the target electrical parameter values are carried out exporting after difference operation the by first comparison module
One difference is to first compensating module；
First compensating module is amplified first difference after compensation and is exported by the isolating device to institute
Control device is stated, the control device carries out analog-to-digital conversion with being sent after pulse width modulation by the first difference after compensating is amplified
To the isolating device；Or the control device is poor by the first difference after analog-to-digital conversion and electric value value progress
The second difference is exported after value computing, and second difference is amplified after compensation and pulse width modulation be sent to it is described every
From device；
The isolating device is according to the first difference after pulse width modulation or the second difference to the defeated of the controll plant
Go out to be adjusted, so that the electrical parameter values of controll plant output are equal to the target electrical parameter values.
Another object of the present invention is also providing a kind of power supply, and the power supply includes above-mentioned isolation digital control circuit.
It is an object of the invention to provide a kind of isolation digital control method based on above-mentioned isolation digital control circuit, institutes
Isolation digital control method is stated to comprise the following steps：
The electrical parameter values and the target electrical parameter values are carried out exporting after difference operation the by first comparison module
One difference is to first compensating module；
First compensating module is amplified first difference after compensation and is exported by the isolating device to institute
State control device；
The control device carries out analog-to-digital conversion with being sent to after pulse width modulation by the first difference after compensating is amplified
The isolating device；
The isolating device is adjusted the output of the controll plant according to the first difference after pulse width modulation,
So that the electrical parameter values of the controll plant output are equal to the target electrical parameter values.
It is digital control that another object of the present invention also resides in a kind of isolation based on above-mentioned isolation digital control circuit of offer
Method, the isolation digital control method comprise the following steps：
The electrical parameter values and the target electrical parameter values are carried out exporting after difference operation the by first comparison module
One difference is to first compensating module；
First compensating module is amplified first difference after compensation and is exported by the isolating device to institute
State control device；
The control device carries out analog-to-digital conversion with being sent to after pulse width modulation by the first difference after compensating is amplified
The first difference after analog-to-digital conversion and the electric value value are carried out difference by the isolating device or the control device
The second difference is exported after computing, and compensation is amplified with being sent to described isolate after pulse width modulation to second difference
Device；
The isolating device is according to the first difference after pulse width modulation or the second difference to the defeated of the controll plant
Go out to be adjusted, so that the electrical parameter values of controll plant output are equal to the target electrical parameter values.
In the present invention, by using control device, isolating device, the first compensating module, the first comparison module and controlled
The isolation digital control circuit of object so that the first comparison module exports first after electrical parameter values and target electrical parameter values are made difference
To the first compensating module, the first compensating module is amplified the first difference after compensation and is exported by isolating device to control difference
Device, control device will amplify the first difference progress analog-to-digital conversion after compensating and isolate dress with being sent to after pulse width modulation
It puts, isolating device is adjusted the output of controll plant according to the first difference after pulse width modulation, so that controll plant
The electrical parameter values of output are equal to target electrical parameter values.What is gathered due to the present invention is that electrical parameter values and the target electricity of controll plant is joined
Difference between numerical value, and compensation is amplified to the difference using the first compensating module, therefore, isolating device may be employed one
As isolating device realize, thereby reduce isolation digital control circuit cost, increase bandwidth, so as to solve it is existing every
From it is digital control there are of high cost and bandwidth it is low the problem of.
Description of the drawings
Fig. 1 is the modular structure schematic diagram for the isolation digital control circuit that first embodiment of the invention is provided；
Fig. 2 is another modular structure schematic diagram for the isolation digital control circuit that first embodiment of the invention is provided；
Fig. 3 is the electrical block diagram for the isolation digital control circuit that first embodiment of the invention is provided；
Fig. 4 is the modular structure schematic diagram for the isolation digital control circuit that second embodiment of the invention is provided；
Fig. 5 is another modular structure schematic diagram for the isolation digital control circuit that second embodiment of the invention is provided；
Fig. 6 is the electrical block diagram for the isolation digital control circuit that second embodiment of the invention is provided；
Fig. 7 is the flow diagram for the isolation digital control method that third embodiment of the invention is provided；
Fig. 8 is the flow diagram for the isolation digital control method that fourth embodiment of the invention is provided.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The realization of the present invention is described in detail below in conjunction with specific attached drawing：
First embodiment：
Fig. 1 shows the modular structure for the isolation digital control circuit 1 that first embodiment of the invention is provided, for the ease of
Illustrate, illustrate only with the relevant part of the embodiment of the present invention, details are as follows：
As shown in Figure 1, isolation digital control circuit 1 provided in an embodiment of the present invention includes control device 10, isolating device
11st, the first compensating module 12, the first comparison module 13 and controll plant 14.
Wherein, the output terminal of control device 10 is connected with the first input end of isolating device 11, and the first of isolating device 11
Output terminal is connected with the input terminal of controll plant 14, the first input end of the output terminal of controll plant 14 and the first comparison module 13
Connection, and electrical parameter values are exported, the second input terminal of the first comparison module 13 receives target electrical parameter values, the first comparison module 13
Output terminal be connected with the input terminal of the first compensating module 12, the output terminal of the first compensating module 12 and the second of isolating device 11
Input terminal connects, and the second output terminal of isolating device 11 is connected with the first input end of control device 10.
Specifically, output first is poor after electrical parameter values and target electrical parameter values are carried out difference operation by the first comparison module 13
Value to the first compensating module 12, the first compensating module 12 first difference is amplified after compensation by isolating device 11 export to
Control device 12, control device 12 carry out analog-to-digital conversion with being sent to after pulse width modulation by the first difference after compensating is amplified
Isolating device 11, isolating device 11 are adjusted the output of controll plant 14 according to the first difference after pulse width modulation,
So that the electrical parameter values that controll plant 14 exports are equal to target electrical parameter values.
It is worth noting that, in embodiment, the electrical parameter values that controll plant 14 exports include but not limited to current value, electricity
Pressure value, performance number etc., and the electrical parameter values that controll plant 14 exports refer to what controll plant was exported in practical applications
Current value, voltage value either performance number, and target electrical parameter values then refer to it is expected 14 institute of controll plant in practical applications
The current value of output, voltage value either performance number.
Further, as a preferred embodiment of the invention, as shown in Fig. 2, control device 10 includes analog-to-digital conversion mould
Block 100 and modulation module 101.
Wherein, the first input end of the input terminal of analog-to-digital conversion module 100 device 10 in order to control, analog-to-digital conversion module 100
Output terminal be connected with the first input end of modulation module 101, the output of the output terminal of modulation module 101 device 10 in order to control
End.
Specifically, output is extremely modulated after analog-to-digital conversion module 100 carries out the first difference after amplification compensation analog-to-digital conversion
Module 101, the first difference after modulation module 101 turns modulus carry out pulse width modulation.
Further, as a preferred embodiment of the invention, as shown in figure 3, modulation module 101 is PWM module, modulus
Existing ADC (analog-digital converter) realizations can be used in modular converter 100.
Further, as a preferred embodiment of the invention, as shown in figure 3, the first compensating module 12 is PID control
Device, and the first compensating module 12 is analog pid controller.
In the present embodiment, by increasing level-one PID compensation in the output terminal of controll plant 14 so that in isolating device 11
Isolating device may be employed normally isolate device realization, such as cheap optocoupler, and the PID compensate can eliminate it is controlled right
The static deviation between output and target electrical parameter values as 14, so compensate for normally isolate device because of non-linear and environment
The parameter drift that factor is brought；In addition, alloing bandwidth using level-one PID compensation, pid regulator parameters obtain according to demand,
So that the bandwidth of the isolating device of isolation digital control circuit 1 can not be limited.
Further, as a preferred embodiment of the invention, as shown in Fig. 2, isolating device 11 includes isolation drive mould
Block 110 and isolation module 111：
Wherein, the input terminal of isolation drive module 110 be isolating device 11 first input end, isolation drive module 110
Output terminal be isolating device 11 the first output terminal, the input terminal of isolation module 111 is the second input terminal of isolating device 11,
The output terminal of isolation module 111 is the second output terminal of isolating device 11.
Specifically, isolation drive module 110 is according to output of first difference to controll plant 14 after pulse width modulation
It is adjusted；The first difference after isolation module 111 compensates amplification carries out isolation processing.
In the present embodiment, isolation module 111 may be employed existing general isolating device and realize, such as existing line
Property poor, performance it is general and substitute existing optocoupler with high costs than less expensive optocoupler, however, it is noteworthy that
The generality isolating device must be monotonicity isolating device, because in the isolation digital control circuit 1 of the embodiment of the present invention,
What it was sampled is the difference between the electrical parameter values that controll plant 14 exports and target electrical parameter values, which need not be accurate,
Also without linear, but must be dull, i.e. the value of generality isolating device input terminal and the value of output terminal needs not exist for line
Sexual intercourse, it is only necessary to there are the closed network adjusting that monotonicity can meet isolation digital control circuit 1, therefore, it is general every
Must be monotonicity isolating device from device.
Second embodiment：
Fig. 4 shows the isolation digital control circuit 2 that second embodiment of the invention is provided, and for convenience of description, only shows
Gone out with the relevant part of the embodiment of the present invention, details are as follows：
As shown in figure 4, the isolation digital control circuit 2 that is provided of second embodiment of the invention include control device 20, every
From device 11, the first compensating module 12, the first comparison module 13 and controll plant 14.
Wherein, the output terminal of control device 20 is connected with the first input end of isolating device 11, and the first of isolating device 11
Output terminal is connected with the input terminal of controll plant 14, the first input end of the output terminal of controll plant 14 and the first comparison module 13
Connection, and electrical parameter values are exported, the second input terminal of the first comparison module 13 receives target electrical parameter values, the first comparison module 13
Output terminal be connected with the input terminal of the first compensating module 12, the output terminal of the first compensating module 12 and the second of isolating device 11
Input terminal connects, and the second output terminal of isolating device 11 is connected with the first input end of control device 20, and the of control device 20
Two input terminals receive electric value value；
Electrical parameter values and target electrical parameter values are carried out exporting after difference operation the first difference to the by the first comparison module 13
One compensating module 12；
First compensating module 12 is amplified the first difference after compensation and is exported by isolating device 11 to control device 20,
Control device 20 carries out analog-to-digital conversion with being sent to isolating device 11 after pulse width modulation by the first difference after compensating is amplified；
Or control device 20 will export the second difference after the first difference after analog-to-digital conversion and electric value value progress difference operation,
And compensation is amplified to the second difference with being sent to isolating device 11 after pulse width modulation；
Isolating device 11 according to the first difference after pulse width modulation or the second difference to the output of controll plant 14 into
Row is adjusted, so that the electrical parameter values that controll plant 14 exports are equal to target electrical parameter values.
It is worth noting that, in embodiment, the electrical parameter values that controll plant 14 exports include but not limited to current value, electricity
Pressure value, performance number etc., and the electrical parameter values that controll plant 14 exports refer to what controll plant was exported in practical applications
Current value, voltage value either performance number, and target electrical parameter values then refer to it is expected 14 institute of controll plant in practical applications
The current value of output, voltage value either performance number, electric value value refer to reference voltage value, reference current value or base
Quasi- performance number.
Further, as a preferred embodiment of the invention, as shown in figure 5, control device 20 further includes analog-to-digital conversion
Module 200, modulation module 201, the second comparison module 202, the second compensating module 203 and switch module 204.
Wherein, the first input end of the input terminal of analog-to-digital conversion module 200 device 20 in order to control, analog-to-digital conversion module 200
Output terminal be connected with the input terminal of switch module 204, the first input end of the second comparison module 202 in order to control device 20
Two input terminals, receive electric value value, the second input terminal of the second comparison module 202 and the second of switch module 204 defeated
Outlet connects, and the output terminal of the second comparison module 202 is connected with the input terminal of the second compensating module 203, the second compensating module 203
Output terminal be connected with the second input terminal of modulation module 201, the first output terminal of switch module 204 and modulation module 201
First input end connects, the output terminal of the output terminal of modulation module 201 device 20 in order to control.
Specifically, when switch module 204 is in the first closure state, analog-to-digital conversion module 200 will be after analog-to-digital conversion
First difference is sent to modulation module 201 by switch module 204, so that modulation module 201 is to the first difference after modulus turn
It is exported after carrying out pulse width modulation to isolating device 11；
When switch module 204 is in the second closure state, analog-to-digital conversion module 200 is by the first difference after analog-to-digital conversion
Be sent to the second comparison module 202 by switch module 204, the second comparison module 202 by the first difference after analog-to-digital conversion with
Electric value value exports the second difference to the second compensating module 203 after carrying out difference operation, and the second compensating module 203 is to second
Output to modulation module 201, modulation module 201 carries out pulse to the second difference after amplification compensation after difference is amplified compensation
It is exported after width modulated to isolating device 11.
Further, as a preferred embodiment of the invention, as shown in fig. 6, the first compensating module 12 and the second compensation
Module 203 is PID controller, and the first compensating module 12 is analog pid controller, and the second compensating module 103 is digital PID control
Device processed.
Further, as a preferred embodiment of the invention, as shown in fig. 6, switch module 204 is opened for single-pole double throw
It closes, the moved end 2 of single-pole double-throw switch (SPDT) is the input terminal of switch module 204, and the first non-moving end 1 of single-pole double-throw switch (SPDT) is switching molding
First output terminal of block 204, the second non-moving end 0 of single-pole double-throw switch (SPDT) are the second output terminal of switch module 204.
In the present embodiment, the second closure state, i.e. single-pole double-throw switch (SPDT) gating 0 are in by switch module 204 so that
The first difference by analog-to-digital conversion that switch module 204 exports analog-to-digital conversion module 200 is exported to the second comparison module
202, the second comparison module 202 obtains the second difference after the first difference by analog-to-digital conversion and electric value value are made difference,
And then processing is compensated to second difference by second level PID compensation, improve the flexible of isolation digital control circuit 2
Property；Further, since being realized when second level PID is compensated using Digital PID Controller, therefore, isolation digital control circuit 2 can also be real
Existing Nonlinear compensation control.
Further, as a preferred embodiment of the invention, as shown in figure 5, isolating device 11 includes isolation drive mould
Block 110 and isolation module 111：
Wherein, the input terminal of isolation drive module 110 be isolating device 11 first input end, isolation drive module 110
Output terminal be isolating device 11 the first output terminal, the input terminal of isolation module 111 is the second input terminal of isolating device 11,
The output terminal of isolation module 111 is the second output terminal of isolating device 11.
Specifically, isolation drive module 110 according to the first difference after pulse width modulation or the second difference to controlled right
The output of elephant is adjusted；The first difference after isolation module 111 compensates amplification carries out isolation processing.
In the present embodiment, isolation module 111 may be employed existing general isolating device and realize, such as existing line
Property poor, performance it is general and substitute existing optocoupler with high costs than less expensive optocoupler, however, it is noteworthy that
The generality isolating device must be monotonicity isolating device, because in the isolation digital control circuit 2 of the embodiment of the present invention,
What it was sampled is the difference between the electrical parameter values that controll plant 14 exports and target electrical parameter values, which need not be accurate,
Also without linear, but must be dull, i.e. the value of generality isolating device input terminal and the value of output terminal needs not exist for line
Sexual intercourse, it is only necessary to there are the closed network adjusting that monotonicity can meet isolation digital control circuit 2, therefore, it is general every
Must be monotonicity isolating device from device.
Further, as a preferred embodiment of the invention, as shown in fig. 6, modulation module 101 is PWM module, modulus
Existing ADC (analog-digital converter) realizations can be used in modular converter 100.
The principle of present invention isolation digital control circuit is specifically described by taking the circuit structure shown in Fig. 6 as an example below,
Details are as follows：
After the controlled electrical parameter values for exclusively enjoying 14 outputs and target electrical parameter values are made difference by the first comparison module 13 of output terminal
The first difference is exported to the first order PID controller of output terminal, first order PID controller is amplified benefit to first difference
It repays, to be exported after the electrical parameter values in the first difference of elimination and the static deviation between target electrical parameter values to isolation module 111, every
Isolation processing is carried out to first difference from module 111, and sends it to ADC, ADC is poor by amplify compensation first to this
Value carries out analog-to-digital conversion.
When single-pole double-throw switch (SPDT) gating 1, ADC sends after analog-to-digital conversion and by amplification compensation the first difference
To PWM, PWM to it is after the analog-to-digital conversion and by amplification compensation the first difference carry out pulse width modulation after send to every
From drive module 110, so that isolation drive module 110 is defeated according to the first difference adjusting controll plant 14 after pulse width modulation
The electrical parameter values gone out, so that the electrical parameter values are equal to target electrical parameter values.
When single-pole double-throw switch (SPDT) gating 0, the first difference after analog-to-digital conversion is sent to the second comparison module 202 by ADC,
Second comparison module 202 exports the second difference to the second level after the first difference after analog-to-digital conversion and electric value value are made difference
PID controller, output is to PWM after second level PID controller is amplified the second difference compensation, after PWM compensates amplification
Output is to isolation drive module 110 after second difference carries out pulse width modulation, and isolation drive module 110 is according to pulse width tune
The second difference after system adjusts the electrical parameter values that controll plant 14 exports, so that the electrical parameter values are equal to target electrical parameter values.
In the present embodiment, digital control circuit 2 is isolated by being compensated in output terminal using first order PID so that first
Grade PID compensation eliminates the static deviation between output valve and target electrical parameter values, and then compensates for because normally isolating the non-of device
The parameter drift that linear and environmental factor is brought, it is cost-effective, dynamic response is good, and can effectively solve isolation and sample to ask
Topic；In addition, isolation digital control circuit 2 is compensated by using two-stage PID so that the loop compensation of isolation digital control circuit 2
It is more flexible, it is more widely applied, can realize Nonlinear compensation control, and can realize the intelligence of bandwidth control, you can with
Adjust or change the compensating parameter of two level PID at any time according to the operating status of the isolation digital control circuit 2.
3rd embodiment：
Further, Fig. 7 shows the realization flow for the isolation digital control method that third embodiment of the invention is provided,
For convenience of description, illustrate only with the relevant part of the embodiment of the present invention, details are as follows：
In step S70, electrical parameter values and target electrical parameter values are carried out exporting after difference operation the by the first comparison module
One difference to the first compensating module；
In step S71, the first compensating module is amplified the first difference after compensation and is exported by isolating device to control
Device processed；
In step S72, control device carries out analog-to-digital conversion and pulse width modulation by the first difference after compensating is amplified
After be sent to isolating device.
In step S73, isolating device carries out the output of controll plant according to the first difference after pulse width modulation
It adjusts, so that the electrical parameter values of controll plant output are equal to target electrical parameter values.
It should be noted that above-mentioned isolation digital control method is based on Fig. 1 to isolation digital control circuit shown in Fig. 3
1 realization, detailed schematic can refer to the description of Fig. 1 to Fig. 3, and details are not described herein again.
Fourth embodiment：
Further, Fig. 8 shows the realization flow for the isolation digital control method that fourth embodiment of the invention is provided,
For convenience of description, illustrate only with the relevant part of the embodiment of the present invention, details are as follows：
In step S80, electrical parameter values and target electrical parameter values are carried out exporting after difference operation the by the first comparison module
One difference to the first compensating module.
In step S81, the first compensating module is amplified the first difference after compensation and is exported by isolating device to control
Device processed.
In step S82, control device carries out analog-to-digital conversion and pulse width modulation by the first difference after compensating is amplified
After be sent to isolating device or control device the first difference after analog-to-digital conversion and electric value value be subjected to difference operation
After export the second difference, and be sent to isolating device after compensation and pulse width modulation are amplified to the second difference.
In step S83, isolating device is according to the first difference after pulse width modulation or the second difference to controll plant
Output be adjusted so that controll plant output electrical parameter values be equal to target electrical parameter values.
It should be noted that above-mentioned isolation digital control method is based on the isolation digital control circuit shown in Fig. 4 to Fig. 6
2 realizations, detailed schematic can refer to the description of Fig. 4 to Fig. 6, and details are not described herein again.
Further, the present invention also provides a kind of power supply, which includes above-mentioned isolation digital control circuit 1 or 2.
In the present embodiment, by using isolation digital control circuit 1 or 2 in power supply so that the output of power supply output
It is consistent with desired value, so as to meet the requirement in practical application to power supply.
In embodiments of the present invention, by using control device 10 or 20, isolating device 11, the first compensating module 12,
The isolation digital control circuit 1 or 2 of one comparison module 13 and controll plant 14 so that the first comparison module 13 by electrical parameter values with
Target electrical parameter values export the first difference to the first compensating module 12 after making difference, and the first compensating module 12 puts the first difference
It is exported after large compensation by isolating device 11 to control device 10 or 20, first after control device 10 or 20 will amplify compensation is poor
Value carries out analog-to-digital conversion with being sent to isolating device 11 after pulse width modulation, after isolating device 11 is according to pulse width modulation
The output of controll plant 14 is adjusted in first difference, so that the electrical parameter values convergence target electrical parameter that controll plant 14 exports
Value.What is gathered due to the present invention is difference between the electrical parameter values of controll plant 14 and target electrical parameter values, and using first
Compensating module 12 is amplified compensation to the difference, and therefore, isolating device 11, which may be employed, normally isolates device realization, and then drops
The cost of low isolation digital control circuit 1 or 2, increases bandwidth, so as to solve existing isolation it is digital control exist into
The problem of this height and low bandwidth.
The foregoing is merely a prefered embodiment of the invention, is not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made within principle etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of isolation digital control circuit, which is characterized in that the isolation digital control circuit includes：
Control device, isolating device, the first compensating module, the first comparison module and controll plant；
The output terminal of the control device is connected with the first input end of the isolating device, the first output of the isolating device
End is connected with the input terminal of the controll plant, the first input of the output terminal of the controll plant and first comparison module
End connection, and electrical parameter values are exported, the second input terminal of first comparison module receives target electrical parameter values, first ratio
Output terminal compared with module is connected with the input terminal of first compensating module, the output terminal of first compensating module with it is described every
The second input terminal connection from device, the second output terminal of the isolating device and the first input end of the control device connect
It connects；
Output first is poor after the electrical parameter values and the target electrical parameter values are carried out difference operation by first comparison module
Value to first compensating module, first compensating module is amplified first difference after compensation through the isolation
Device is exported to the control device, and the control device will amplify the first difference progress analog-to-digital conversion after compensating and pulse is wide
The isolating device is sent to after degree modulation, the isolating device is according to the first difference after pulse width modulation to described controlled
The output of object is adjusted, so that the electrical parameter values of controll plant output are equal to the target electrical parameter values.
2. isolation digital control circuit according to claim 1, which is characterized in that the control device includes analog-to-digital conversion
Module and modulation module；
The input terminal of the analog-to-digital conversion module be the control device first input end, the output of the analog-to-digital conversion module
End is connected with the first input end of the modulation module, and the output terminal of the modulation module is the output terminal of the control device；
The analog-to-digital conversion module is exported after carrying out analog-to-digital conversion to the first difference after the amplification compensation to the modulation mould
Block, the first difference after the modulation module turns modulus carry out pulse width modulation.
3. a kind of isolation digital control circuit, which is characterized in that the isolation digital control circuit includes：
Control device, isolating device, the first compensating module, the first comparison module and controll plant；
The output terminal of the control device is connected with the first input end of the isolating device, the first output of the isolating device
End is connected with the input terminal of the controll plant, the first input of the output terminal of the controll plant and first comparison module
End connection, and electrical parameter values are exported, the second input terminal of first comparison module receives target electrical parameter values, first ratio
Output terminal compared with module is connected with the input terminal of first compensating module, the output terminal of first compensating module with it is described every
The second input terminal connection from device, the second output terminal of the isolating device and the first input end of the control device connect
It connects, the second input terminal of the control device receives electric value value；
Output first is poor after the electrical parameter values and the target electrical parameter values are carried out difference operation by first comparison module
It is worth to first compensating module；
First compensating module is amplified first difference after compensation and is exported by the isolating device to the control
Device processed, the control device carry out analog-to-digital conversion with being sent to institute after pulse width modulation by the first difference after compensating is amplified
State isolating device；Or the first difference after analog-to-digital conversion and the electric value value are carried out difference fortune by the control device
The second difference is exported after calculation, and compensation is amplified to second difference and described isolates dress with being sent to after pulse width modulation
It puts；
The isolating device according to the first difference after pulse width modulation or the second difference to the output of the controll plant into
Row is adjusted, so that the electrical parameter values of controll plant output are equal to the target electrical parameter values.
4. isolation digital control circuit according to claim 3, which is characterized in that the control device further includes：
Analog-to-digital conversion module, modulation module, the second comparison module, the second compensating module and switch module；
The input terminal of the analog-to-digital conversion module be the control device first input end, the output of the analog-to-digital conversion module
End is connected with the input terminal of switch module, and the first input end of second comparison module inputs for the second of the control device
End, receives the electric value value, the second input terminal of second comparison module and the second of the switch module defeated
Outlet connects, and the output terminal of second comparison module is connected with the input terminal of second compensating module, second compensation
The output terminal of module is connected with the second input terminal of the modulation module, the first output terminal and the modulation of the switch module
The first input end connection of module, the output terminal of the modulation module are the output terminal of the control device；
When the switch module is in the first closure state, the analog-to-digital conversion module is poor by first after the analog-to-digital conversion
Value is sent to the modulation module by the switch module, so that the modulation module is to the first difference after the modulus turn
It is exported after carrying out pulse width modulation to the isolating device；
When the switch module is in the second closure state, the analog-to-digital conversion module is poor by first after the analog-to-digital conversion
Value is sent to second comparison module by the switch module, and second comparison module is by the after the analog-to-digital conversion
One difference and the electric value value export after difference operation the second difference to second compensating module, and described second
Output to the modulation module, the modulation module compensates amplification after compensating module is amplified second difference compensation
The second difference afterwards is exported after carrying out pulse width modulation to the isolating device.
5. isolation digital control circuit according to claim 4, which is characterized in that first compensating module is simulation ratio
Example integral-derivative controller, second compensating module are digital proportional integral differential control device.
6. isolation digital control circuit according to claim 4, which is characterized in that the switch module is opened for single-pole double throw
It closes, the moved end of the single-pole double-throw switch (SPDT) is the input terminal of the switch module, the first non-moving end of the single-pole double-throw switch (SPDT)
For the first output terminal of the switch module, the second non-moving end of the single-pole double-throw switch (SPDT) is second defeated for the switch module
Outlet.
7. the isolation digital control circuit according to claim 3 or 4, which is characterized in that the isolating device includes isolation
Drive module and isolation module：
The input terminal of the isolation drive module be the isolating device first input end, the output of the isolation drive module
The first output terminal for the isolating device is held, the input terminal of the isolation module is the second input terminal of the isolating device,
The output terminal of the isolation module is the second output terminal of the isolating device；
The isolation drive module is according to the first difference after the pulse width modulation or the second difference to the controll plant
Output be adjusted；The isolation module carries out isolation processing to the first difference after the amplification compensation.
8. a kind of power supply, which is characterized in that the power supply include isolation digital control circuit as claimed in claim 1 or 2 or
Isolate digital control circuit including such as claim 3 to 7 any one of them.
A kind of 9. isolation digital control method based on isolation digital control circuit described in claim 1, which is characterized in that institute
Isolation digital control method is stated to comprise the following steps：
Output first is poor after the electrical parameter values and the target electrical parameter values are carried out difference operation by first comparison module
It is worth to first compensating module；
First compensating module is amplified first difference after compensation and is exported by the isolating device to the control
Device processed；
It is described with being sent to after pulse width modulation that the control device will amplify the first difference progress analog-to-digital conversion after compensating
Isolating device；
The isolating device is adjusted the output of the controll plant according to the first difference after pulse width modulation, so that
The electrical parameter values of the controll plant output are equal to the target electrical parameter values.
10. a kind of isolation digital control method of the isolation digital control circuit based on described in claim 3, which is characterized in that
The isolation digital control method comprises the following steps：
Output first is poor after the electrical parameter values and the target electrical parameter values are carried out difference operation by first comparison module
It is worth to first compensating module；
First compensating module is amplified first difference after compensation and is exported by the isolating device to the control
Device processed；
It is described with being sent to after pulse width modulation that the control device will amplify the first difference progress analog-to-digital conversion after compensating
The first difference after analog-to-digital conversion and the electric value value are carried out difference operation by isolating device or the control device
After export the second difference, and compensation is amplified to second difference and described isolates dress with being sent to after pulse width modulation
It puts；
The isolating device according to the first difference after pulse width modulation or the second difference to the output of the controll plant into
Row is adjusted, so that the electrical parameter values of controll plant output are equal to the target electrical parameter values.
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| CN201611076609.2A CN108121200A (en) | 2016-11-28 | 2016-11-28 | A kind of power supply and its isolation digital control circuit and method |
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| CN201611076609.2A CN108121200A (en) | 2016-11-28 | 2016-11-28 | A kind of power supply and its isolation digital control circuit and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112448699A (en) * | 2019-08-29 | 2021-03-05 | 炬佑智能科技(苏州)有限公司 | Quick-response pulse width compensation circuit and method |
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