CN105871186B - A kind of current flowing backwards guard method, device and circuit of synchronous rectification - Google Patents
A kind of current flowing backwards guard method, device and circuit of synchronous rectification Download PDFInfo
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- CN105871186B CN105871186B CN201610301494.6A CN201610301494A CN105871186B CN 105871186 B CN105871186 B CN 105871186B CN 201610301494 A CN201610301494 A CN 201610301494A CN 105871186 B CN105871186 B CN 105871186B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The application provides a kind of current flowing backwards guard method, device and circuit of synchronous rectification, the anti-sink current of the output of object module output power circuit described in this method real-time sampling, it is compared with preset reference signal, the output voltage control signal controlled the output voltage of object module power circuit is obtained according to comparison result, it is adjusted by the output voltage to the object module output power circuit, it is run in the state of may make the anti-sink current of output of the object module output power circuit to be less than or equal to the preset reference signal, therefore, reduce the object module output power circuit probability excessive and impaired because of the anti-sink current of output.
Description
Technical field
The present invention relates to power electronic equipment technical fields, and in particular to a kind of current flowing backwards guard method, device and same
Walk rectification circuit.
Background technique
With electronic technology high speed development, many applications require the operating voltage of circuit lower and lower, and electric current is more next
It is bigger.In the case where exporting low-voltage, high-current, the ratio of output power shared by diode losses is very big, so conventional diode
Rectification has been not suitable for applying in the circuit of low-voltage, high-current.Therefore occur synchronous rectification being applied to power supply system
In design method, circuit of synchronous rectification use conducting resistance very little metal oxide semiconductor field effect tube (abbreviation MOS
Pipe) replace diode.Because metal-oxide-semiconductor conduction loss is more much smaller than diode losses, synchronous rectification is effectively promoted
Power-efficient and power density.
But there is bi-directional conductive when realizing synchronous rectification with metal-oxide-semiconductor, under some abnormal conditions, metal-oxide-semiconductor can flow through
Anti- sink current is exported, if the anti-sink current of the output is excessive, it is exceeded to will cause inverter power device (metal-oxide-semiconductor) stress, more sternly
The situation of weight can be such that power device damages.So using the power circuit of synchronous rectification, there are reliability hidden danger.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of current flowing backwards guard method, device and circuit of synchronous rectification, with drop
Low target module output power circuit impaired probability because of anti-sink current.
To achieve the above object, the embodiment of the present invention provides the following technical solutions:
A kind of current flowing backwards guard method, comprising:
The anti-sink current of the output of object module output power circuit is sampled, obtains exporting anti-sink current sampling letter
Number；
The anti-sink current sampled signal of output is compared with preset reference signal；
Generate that matching with comparison result, described to export anti-sink current little for keeping according to preset loop algorithm
In the output voltage control signal of the preset reference signal；
The output voltage of the object module output power circuit is adjusted according to the output voltage control signal.
Preferably, in above-mentioned current flowing backwards guard method, the preset loop algorithm is, but is not limited to Position Form PID
Algorithm, increment type PID algorithm, 2P2Z algorithm or 3P3Z algorithm.
Preferably, in above-mentioned current flowing backwards guard method, the output voltage control signal is PWM duty cycle control letter
Number, PWM switching frequency control signal or output voltage benchmark adjustment signal.
Preferably, in above-mentioned current flowing backwards guard method, the anti-sink current sampled signal of output and preset reference signal
The process being compared, the output with the voltage control signal is either synchronously or asynchronously.
A kind of current flowing backwards protective device, comprising:
Sample circuit, single chip machine controlling circuit and output voltage driving circuit；
The input terminal of the sample circuit is connect with the output end of the object module output power circuit of required protection, is used for
Sample the anti-sink current of output of the object module output power circuit；
The input terminal of the single chip machine controlling circuit is connected with the output end of the sample circuit, the output for will acquire
Anti- sink current is compared with preset reference signal, according to preset loop algorithm generate match with comparison result, be used for
The anti-sink current sampled signal of output is kept to be not more than the output voltage control signal of the preset reference signal；
The input terminal of the output voltage driving circuit is connected with the output end of the single chip machine controlling circuit, is used for foundation
The output voltage control signal got exports the driving for controlling the output voltage of the object module output power circuit
Signal；
The control terminal of the object module output power circuit is connected with the output end of the output voltage driving circuit, uses
In the output voltage that output matches with the driving signal.
Preferably, in above-mentioned current flowing backwards protective device, the sample circuit is, but be not limited to resistance-type sample circuit or
Mutual inductor sample circuit.
Preferably, in above-mentioned current flowing backwards protective device, the single chip machine controlling circuit includes:
Adc circuit, processor and PWM output circuit；
The adc circuit, for obtaining the anti-sink current of output arrived through the sampling circuit samples；
The processor, for the anti-sink current sampled signal of output to be compared with preset reference signal, foundation
Preset loop algorithm generate it is matching with comparison result, for keeping the anti-sink current sampled signal of output no more than institute
State the output voltage control signal of preset reference signal；
PWM output circuit is exported for the output voltage control signal to be converted to pwm control signal.
Preferably, in above-mentioned current flowing backwards protective device, the adc circuit is specifically used for:
Using low-pass filter by by the sampling circuit samples to the anti-sink current of output sampled after export.
Preferably, in above-mentioned current flowing backwards protective device, the preset loop algorithm is but is not limited to Position Form PID calculation
Method, increment type PID algorithm, 2P2Z algorithm or 3P3Z algorithm.
A kind of circuit of synchronous rectification, comprising: current flowing backwards protective device described in above-mentioned any one, wherein described same
The main power circuit in rectification circuit is walked as the object module output power circuit.
Based on the above-mentioned technical proposal, above scheme provided in an embodiment of the present invention is defeated by object module described in real-time sampling
It is compared by the anti-sink current of the output of power circuit out with preset reference signal, according to comparison result to the target mould
The output voltage control letter of output voltage of the block output power circuit output for adjusting the object module output power circuit
Number, by the adjusting of the output voltage to the object module output power circuit, that is, it may make the object module output work
Rate circuit is run in the state of exporting anti-sink current and being less than or equal to the preset reference signal, therefore, reduces the mesh
Mark the module output power circuit probability excessive and impaired because of the anti-sink current of output.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of flow diagram of current flowing backwards guard method disclosed in the embodiment of the present application；
Fig. 2 is the structural schematic diagram of current flowing backwards protective device disclosed in the embodiment of the present application；
Fig. 3 is a kind of structural schematic diagram of single chip machine controlling circuit disclosed in the embodiment of the present application；
Fig. 4 is a kind of structural schematic diagram of single chip machine controlling circuit disclosed in another embodiment of the application.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention for each embodiment of the application, rather than complete
The embodiment in portion.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, shall fall within the protection scope of the present invention.
For the reliability for enhancing the power supply using synchronous rectification, it is desirable to provide output current flowing backwards are prevented, to reduce
Rectification circuit damage probability, based on the above reasons, this application discloses a kind of current flowing backwards guard method, device with it is synchronous whole
Current circuit.
Embodiment one
Fig. 1 is a kind of flow diagram of current flowing backwards guard method disclosed in the embodiment of the present application；
Referring to Fig. 1, this method, comprising:
Step S101: sampling the anti-sink current of the output of object module output power circuit, obtains exporting anti-filling electricity
Flow sampled signal；
It in this step, can be using conventional to the sampling of the anti-sink current of output of the object module output power circuit
Sample circuit is realized, specifically can voluntarily be selected according to user demand using the sample circuit of which kind of form, for example, the sampling is electric
The anti-filling of the output can be obtained by the voltage value at the sampling resistor both ends of survey by being only made of a sampling resistor in road
The value of electric current: the anti-sink current signal of output is converted by voltage signal by sampling resistor, then passes through the voltage signal
Resistance value with the sampling resistor is that can determine the size of the anti-sink current of output；
Step S102: the obtained anti-sink current sampled signal of output that samples is compared with preset reference signal；
In this step, the preset reference signal can for user according to the object module output power circuit most
The value for allowing to export anti-sink current setting greatly, by the ratio that will sample obtained output anti-sink current and the preset reference signal
Compared with as a result, judging whether to need to adjust the output voltage of the object module output power circuit, disclosed in the present application above-mentioned
In method.The preset reference signal can be set as being slightly less than the permitted maximum of the object module output power circuit instead
Sink current, certainly, the preset reference signal may be set to be permitted equal to the object module output power circuit
Maximum anti-sink current；
Step S103: the output voltage control signal to match with comparison result, institute are generated according to preset loop algorithm
Output voltage control signal is stated for keeping the anti-sink current sampled signal of output defeated no more than the preset reference signal
Voltage control signal out；
In this step, it by the comparison result of the step S102, is generated using preset loop algorithm and is tied compared with
The output voltage control signal that fruit matches can adjust the object module output power electricity by the output voltage control signal
The output voltage on road may make the object module output work by the adjusting of the output voltage to the target rectifier equipment
The anti-sink current of the output of rate circuit keeps below the anti-sink current of the permitted maximum output of object module output power circuit
Value；For example, when the anti-sink current of the output that comparison result characterization present sample obtains is greater than the preset reference signal, institute
Stating output voltage control signal can be the control raised control signal of object module output power circuit output voltage；When
It is described defeated when the anti-sink current of the output that the comparison result characterization present sample obtains is no more than the preset reference signal
Voltage control signal can be sky out, when the output voltage control signal is empty, above-mentioned side disclosed in the embodiment of the present application
Method does not control the working condition or output voltage of the object module output power circuit；
Step S104: the output electricity of the object module output power circuit is adjusted according to the output voltage control signal
Pressure；
In this step, when the object module output power circuit gets the output voltage control signal, according to
The output voltage of the object module output power circuit is adjusted according to the output voltage control signal, it is described defeated so as to reduce
Anti- sink current out, to reduce the object module output power circuit because of excessive and impaired general of the anti-sink current of the output
Rate.
By method disclosed in the above embodiments of the present application as it can be seen that the application passes through the output of object module described in real-time sampling
The anti-sink current of the output is compared by the anti-sink current of the output of power circuit with the reference signal of user preset, and foundation compares
As a result it is exported to the object module output power circuit, for adjusting the output voltage of the object module output power circuit
Output voltage control signal institute may make by the adjusting of the output voltage to the object module output power circuit
Object module output power circuit is stated to run in the state of exporting anti-sink current and being less than or equal to the preset reference signal, because
This, reduces the object module output power circuit probability excessive and impaired because of the anti-sink current of output.
Embodiment two
It should be noted that in the output voltage control for generating result based on the comparison using the preset loop algorithm
When signal processed, the preset loop algorithm can be taken various forms, for example, the algorithm can be Position Form PID algorithm, increasing
Amount formula pid algorithm, 2P2Z algorithm or 3P3Z algorithm etc., it is of course also possible to be for other loop control algorithms.
It should be noted that the signal type of the output voltage control signal can foundation in the application above method
User demand voluntarily selects, for example, it can control signal for PWM duty cycle or PWM switching frequency controls signal, or output electricity
Benchmark is pressed to control (adjustment) signal.
It is understood that when being directed to the object module output power circuit of different types of structure, the above-mentioned reality of the application
Applying method disclosed in example can be using different sample mode, for example, when the object module output power circuit is isolated
(transformer is provided in the circuit) when circuit, i.e., object module output power circuit includes primary side (primary side of transformer) and pair
At when secondary (transformer), at this point, since the primary current of the object module output power circuit is same to a certain extent
Sample also can reflect the anti-sink current of output on its secondary side, therefore, either sample or use the side of secondary sampler using primary side
Formula can realize the sampling to the anti-sink current of output, still, the complexity of the wiring of consideration, in order to enable circuit design
It is more simple, in method disclosed in the above embodiments of the present application, when the object module output power circuit is isolated circuit
When, it is preferred to use the mode of secondary sampler export to the object module output power circuit sampling of anti-sink current
The sample circuit for being used to carry out to export anti-sink current sampling is arranged in the secondary side of the object module output power circuit, thus
Circuit structure can be simplified.
Disclosed in above-described embodiment in current flowing backwards guard method, reality can be when sampling the anti-sink current of the output
When sample, be also possible to be sampled according to opportunity, for example, when the object module output power circuit output end flows through
Electric current when being pull-down current, the sampling without the anti-sink current of the output at this time, only when the object module output work
When the output end of rate circuit flows through output anti-sink current, the sampling of the anti-sink current of output is just carried out.
More specifically, method generates the PWM duty cycle control signal disclosed in the above embodiments of the present application or PWM is opened
When closing frequency control signal, it can not be directly generated since the PWM duty cycle controls signal or PWM switching frequency control signal,
Therefore the voltage reference signal to match with comparison result can be first generated, then uses another preset loop algorithm by the electricity again
Pressure calibration signal is converted to PWM duty cycle signal or PWM switch frequency signal.It is of course also possible to directly use voltage reference signal
Adjust output voltage.
It is understood that disclosed in the above embodiments of the present application in method, the output voltage control signal can be with
Be it is synchronous with the comparison procedure of preset reference signal with the anti-sink current of above-mentioned output, can also be different step between the two certainly,
It is i.e. asynchronous.
In summary, current flowing backwards guard method disclosed in the above embodiments of the present application, by being exported to object module
The anti-sink current of the output of power circuit carries out real-time sampling, and the output in the available object module output power circuit is anti-
The real value of sink current, then believed by the sampled signal for the anti-sink current of output that will be obtained with the preset preset reference is used for
It number is compared, can determine whether to need to be adjusted the anti-sink current of output according to comparison result, when needing to institute
When stating the anti-sink current of output and being adjusted, the control for adjusting the output voltage of the object module output power circuit is exported
The output voltage control signal is acted on the object module output power circuit, so as to adjust the object module by signal
The adjustment of the size of the anti-sink current of output can be realized, to may make described defeated in the output voltage of output power circuit
Anti- sink current is maintained within the scope of the permitted maximum value of object module output power circuit out, reduces the mesh
The probability that mark module output power circuit is damaged by the anti-sink current of the output.
It is understood that being directed to above-mentioned current flowing backwards guard method, disclosed herein as well is a kind of principle is similar
The technical solution of current flowing backwards protective device, the two can be used for reference mutually.
Embodiment one
Fig. 2 is the structural schematic diagram of current flowing backwards protective device disclosed in the embodiment of the present application；
Referring to fig. 2, the apparatus may include: sample circuit 100, single chip machine controlling circuit 200 and output voltage drivings
Circuit 300；
Wherein, the output end of the input terminal of the sample circuit 100 and the object module output power circuit A of required protection
Connection, for sampling the anti-sink current of output of the object module output power circuit A；
The input terminal of the single chip machine controlling circuit 200 is connected with the output end of the sample circuit 100, and being used for will be through institute
It states the anti-sink current of output that the sampling of sample circuit 100 obtains to be compared with preset reference signal set by user, and using pre-
If loop algorithm generate the output voltage control signal to match with the comparison result, wherein the output voltage control signal
It can be used for realizing the adjustment of the output voltage size of the object module output power circuit A, by adjusting the object module
The output voltage size of output power circuit A finally may make the anti-sink current sampled signal of output to be maintained at no more than institute
In the range of stating preset reference signal, that is, keep the anti-sink current of output no more than the object module output power circuit A
The permitted anti-sink current value of maximum output；
The input terminal of the output voltage driving circuit 300 is connected with the output end of the single chip machine controlling circuit 200, uses
In the output voltage control signal for obtaining the output of single chip machine controlling circuit 200, according to the output voltage control letter got
Number matched driving signal is generated, which is for acting on the object module output power circuit A
Driving signal in power switch tube, the driving signal are controlled by the on state to the power switch tube, can be real
Now to the adjustment of the output voltage size of the object module output power circuit, the object module output power is finally realized
Adjustment of the output voltage of circuit A by the output voltage control signal；
The control terminal and the output end phase of the output voltage driving circuit 300 of the object module output power circuit A
Even, the driving signal exported for obtaining the output voltage driving circuit 300, the output of itself is adjusted according to the driving signal
Voltage；
When the object module output power circuit gets the output voltage control signal, according to the output electricity
Voltage-controlled signal processed increases the output voltage of the object module output power circuit, so as to reduce the anti-sink current of output,
To reduce the object module output power circuit probability excessive and impaired because of the anti-sink current of output.
By current flowing backwards protective device disclosed in the above embodiments of the present application as it can be seen that the application passes through described in real-time sampling
It is compared by the anti-sink current of the output of object module output power circuit with preset reference signal, according to comparison result to
The object module output power circuit output, the output of the output voltage for adjusting the object module output power circuit
Voltage control signal may make the target by the adjusting of the output voltage to the object module output power circuit
Module output power circuit is run in the state of exporting anti-sink current and being less than or equal to the preset reference signal, therefore, drop
The low object module output power circuit probability excessive and impaired because of the anti-sink current of output.
Embodiment two
It is understood that the function using sample circuit 100 is for the object module in above-mentioned apparatus
The anti-sink current of the output of output power circuit A is sampled, the structure class of the sample circuit since current sample function can be achieved
Type is varied, therefore the application is not defined its specific structure type, for example, it can be resistance-type sample circuit
Or mutual inductor sample circuit in addition its can be only made of a sampling resistor, pass through the voltage value at the sampling resistor both ends of survey
The value of the anti-sink current of output can be obtained；In view of sampling resistor has the advantages that structure is simple and low cost, therefore, this
Apply for that disclosed above-mentioned apparatus preferably samples the anti-sink current of output by the way of resistance, the sampling resistor
What is sampled is the anti-sink current of output of the object module output power circuit, and the anti-sink current of the output sampled is converted into electricity
Pressure output, as having interchangeability therefore can be by adopting between voltage and current in the situation known to sampling resistor resistance value
The sampled voltage at sample circuit both ends determines the size of the anti-sink current of output.
Specifically, the preset reference signal in the single chip machine controlling circuit 200 can be user according to described in
The value of the anti-sink current setting of the maximum allowable output of object module output power circuit, the single chip machine controlling circuit 200 pass through
The comparison result of output anti-sink current and the preset reference signal that sampling is obtained, judges whether to need to adjust the target
The output voltage of module output power circuit A, in above scheme disclosed in the present application.The preset reference signal can be set
To be slightly less than the permitted anti-sink current of maximum of the object module output power circuit, certainly, the preset reference signal
It can be set to be equal to the permitted anti-sink current of maximum of the object module output power circuit.
When the single chip machine controlling circuit 200 generates the output electricity to match with comparison result using preset loop algorithm
When voltage-controlled signal processed, the target mould can be adjusted by the output voltage control signal and the output voltage driving circuit 300
The output voltage of block output power circuit A can by the adjusting of the output voltage to the object module output power circuit A
So that the anti-sink current of output of the object module output power circuit A keeps below or is equal to the object module output power
The anti-sink current value of the permitted maximum output of circuit；For example, when 200 comparison result of single chip machine controlling circuit characterization is currently adopted
The anti-sink current of the output that sample obtains be greater than the preset reference signal when, the output voltage control signal can for for
Control the raised control signal of object module output power circuit A output voltage；When comparison result characterization is currently adopted
When the anti-sink current of the output that sample obtains is not more than the preset reference signal, show the anti-sink current of output in the mesh
Within the tolerance band for marking module output power circuit A, the output voltage control signal can be sky, when the output voltage
When control signal is empty, above-mentioned apparatus disclosed in the embodiment of the present application is not to the work shape of the object module output power circuit
State or output voltage are controlled.
Further, in device disclosed in the above embodiments of the present application, the type of the single chip machine controlling circuit 200 can be with
It is voluntarily selected according to user demand, in the processing and analysis speed in order to ensure above-mentioned current flowing backwards protective device, the monolithic
Machine control circuit 200 chip can be controlled for DSP with the above function or DSC controls chip.
Institute is based on it should be noted that generating in the single chip machine controlling circuit 300 using the preset loop algorithm
When stating the output voltage control signal of comparison result, the preset loop algorithm can be taken various forms, and the application is not
The concrete type of the preset loop algorithm is defined, for example, the algorithm can be Position Form PID algorithm, increment type
Pid algorithm, 2P2Z algorithm or 3P3Z algorithm etc., it is of course also possible to be for other loop control algorithms.
It should be noted that in the application above-mentioned apparatus, the output voltage of the output of single chip machine controlling circuit 300
Control signal signal type can voluntarily be selected according to user demand, for example, its can for PWM duty cycle control signal or
PWM switching frequency controls signal or output voltage reference control signal.
It is understood that when being directed to the object module output power circuit A of different types of structure, the above-mentioned reality of the application
Different companies can be used by applying between sample circuit 100 described in device disclosed in example and the object module output power circuit A
Mode is connect, for example, when the object module output power circuit A is isolated circuit, i.e. object module output power circuit A
When including primary and secondary side, at this point, filling electricity since output that primary current equally also can reflect secondary side to a certain extent is counter
Therefore stream is either sampled using primary side or exports anti-sink current to described using that can realize by the way of secondary sampler
Sampling, therefore, the input terminal of the sample circuit 100 can be connected with the primary side of the object module output power circuit A,
It can also be connected with the secondary side of the object module output power circuit.But, it is contemplated that the complexity of wiring, in order to enable on
It is more simple to state apparatus structure design, in method disclosed in the above embodiments of the present application, when the object module output power electricity
When road A is isolated circuit, it is preferred to use the mode of secondary sampler carries out exporting anti-filling to object module output power circuit A
The sampling of electric current can export the setting of sample circuit 100 for being used to carry out to export anti-sink current sampling in the object module
The secondary side of power circuit A, so as to simplify circuit structure.
In above-described embodiment of the application, when the output sample circuit 100 samples the output anti-sink current, it can adopt
It is sampled with output anti-sink current signal of the mode of real-time sampling to the object module output power circuit A.
Disclosed in above-described embodiment in current flowing backwards protective device, the sample circuit 100 is to sample the output anti-
It can be real-time sampling when sink current, be also possible to what foundation opportunity was sampled, for example, it is contemplated that defeated to the object module
The existing pull-down current of current signal that the output end of power circuit A flows through out, and have anti-sink current, it therefore, can be by described
The structure of sample circuit 100 is rationally arranged, so that working as the electric current that the object module output power circuit A output end flows through
When for pull-down current, the sample circuit 100 is without sampling, when the output end stream of the object module output power circuit A
It crosses when exporting anti-sink current, the sample circuit 100 just carries out the sampling of the anti-sink current of output.The sample circuit 100
Specifically setting frame mode can be according to user demand sets itself, as long as guaranteeing that it can shield pull-down current and only sample output
Anti- sink current.
Embodiment three
Fig. 3 is a kind of structural schematic diagram of single chip machine controlling circuit disclosed in the embodiment of the present application；
In above-mentioned apparatus, the single chip machine controlling circuit 300 can be made of multiple functional circuits, referring to Fig. 3, structure
May include:
Adc circuit 310, processor 320 and PWM output circuit 330；
Wherein, the adc circuit 310, for obtaining the anti-sink current of output sampled through the sample circuit 100；
The processor 320, for the anti-sink current sampled signal of output to be compared with preset reference signal, according to
According to preset loop algorithm generate it is matching with comparison result, export anti-sink current sampled signal for keeping described and be not more than
The output voltage control signal of the preset reference signal；
PWM output circuit 330 is exported for the output voltage control signal to be converted to pwm control signal,
Can output voltage a reference value directly be adjusted using output voltage control signal.
Fig. 4 is a kind of structural schematic diagram of single chip machine controlling circuit disclosed in another embodiment of the application；
Wherein, since the control signal of the output voltage driving circuit 300 input can be that digital signal can be again
Analog signal, therefore, disclosed in the above embodiments of the present application in device, output voltage control that the processor 320 exports
Signal not only can be digital signal but also can be analog signal.Therefore, referring to fig. 4, the PWM output circuit 330 may include
PWM duty cycle signal generating circuit 331, PWM switch frequency signal generative circuit 332 and output voltage benchmark adjustment circuit 333；
The PWM duty cycle signal generating circuit 331 is used to the output voltage control signal being converted to PWM duty cycle
It is exported after signal；
The PWM switch frequency signal generative circuit 332 is used to being converted to the output voltage control signal into PWM switch
It is exported after frequency signal；
The output voltage benchmark adjustment circuit 333 is used to export the output to match with the output voltage control signal
Voltage reference signal, the reference signal are analog signal.
Specifically, in order to facilitate subsequent conditioning circuit progress signal processing and analyzing, in above-described embodiment, the adc circuit 310
In be provided with low-pass filter, the adc circuit 310 will be sampled defeated using low-pass filter by the sample circuit 100
Anti- sink current exports after being handled out.
It is understood that the single chip machine controlling circuit 300 exports disclosed in the above embodiments of the present application in device
Output voltage control signal can be it is synchronous with the comparison procedure of preset reference signal with the anti-sink current of above-mentioned output, certainly
It can also be different step between the two, i.e., it is asynchronous.
To sum up, current flowing backwards protective device disclosed in the above embodiment of the present invention, by exporting anti-sink current sample circuit
100 sampling and single chip machine controlling circuit 200 detect output electric current whether occur in object module output power circuit A
Whether anti-filling and its anti-sink current of output exceed early warning value, and when there are current flowing backwards and the anti-sink current of output is beyond pre-
When alert value, the output voltage of the object module output power circuit is controlled；And then realize to the control of output current flowing backwards, make
It maintains preset current flowing backwards value, reduce in this way the devices such as the synchronous rectifier in object module output power circuit because
Damage caused by current flowing backwards；And the sample circuit 100 has strong real-time, time delay using the sample mode of real-time sampling
The advantages that small and control precision is high.
It is understood that corresponding to above-mentioned current flowing backwards protective device, above-mentioned put is applied disclosed herein as well is a kind of
The circuit of synchronous rectification of current flowing backwards device, the circuit of synchronous rectification may include: electricity disclosed in above-mentioned any one embodiment
Stream is anti-to fill protective device, wherein the main power circuit in the circuit of synchronous rectification is as the object module output power electricity
Road.
In embodiment provided herein, it should be understood that disclosed device and method can pass through others
Mode is realized.Apparatus embodiments described above are merely indicative, for example, the division of the unit, only a kind of
Logical function partition, there may be another division manner in actual implementation, such as: multiple units or components can combine, or can be with
It is integrated into another system, or some features can be ignored or not executed.In addition, shown or discussed each component part phase
Coupling or direct-coupling or communication connection between mutually can be through some interfaces, the INDIRECT COUPLING or logical of equipment or unit
Letter connection, can be electrical, mechanical or other forms.
Above-mentioned unit as illustrated by the separation member, which can be or may not be, to be physically separated, aobvious as unit
The component shown can be or may not be physical unit, it can and it is in one place, it may be distributed over multiple network lists
In member；Some or all of units can be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
In addition, each functional unit in this embodiment of the invention can be fully integrated into a processing module, it can also
To be each unit individually as a unit, can also be integrated in one unit with two or more units；It is above-mentioned
Integrated unit both can take the form of hardware realization, can also realize in the form of hardware adds SFU software functional unit.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above method embodiment can pass through
Program instruction relevant hardware is completed, and the program of preceding method can be stored in a computer readable storage medium, should
Program when being executed, executes step including the steps of the foregoing method embodiments；And storage medium above-mentioned include: movable storage device,
Read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic
The various media that can store program code such as dish or CD.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of current flowing backwards guard method characterized by comprising
Anti- sink current is exported to the secondary side of isolated object module output power circuit to sample, and is obtained exporting anti-sink current and be adopted
Sample signal；
The anti-sink current sampled signal of the output is compared with preset reference signal, the preset reference signal for user according to
According to the value of the anti-sink current setting of the maximum allowable output of the object module output power circuit；
According to preset loop algorithm generate it is matching with comparison result, for keeping the anti-sink current of the output no more than institute
State the output voltage control signal of preset reference signal；
The output voltage of the object module output power circuit is adjusted according to the output voltage control signal.
2. current flowing backwards guard method according to claim 1, which is characterized in that the preset loop algorithm is, but
It is not limited to Position Form PID algorithm, increment type PID algorithm, 2P2Z algorithm or 3P3Z algorithm.
3. current flowing backwards guard method according to claim 1, which is characterized in that the output voltage control signal is
PWM duty cycle controls signal, PWM switching frequency control signal or output voltage benchmark adjustment signal.
4. current flowing backwards guard method according to claim 1, which is characterized in that the anti-sink current sampled signal of output
The process being compared with preset reference signal, the output with the voltage control signal is either synchronously or asynchronously.
5. a kind of current flowing backwards protective device characterized by comprising
Sample circuit, single chip machine controlling circuit and output voltage driving circuit；
The input terminal of the sample circuit and the secondary side output end of the isolated object module output power circuit of required protection connect
It connects, for sampling the anti-sink current of output of the object module output power circuit；
The input terminal of the single chip machine controlling circuit is connected with the output end of the sample circuit, and the output for will acquire is counter to be filled
Electric current is compared with preset reference signal, according to preset loop algorithm generate match with comparison result, for keeping
The anti-sink current sampled signal of output is not more than the output voltage control signal of the preset reference signal, the preset reference
Signal is the value of maximum allowable output anti-sink current setting of the user according to the object module output power circuit；
The input terminal of the output voltage driving circuit is connected with the output end of the single chip machine controlling circuit, for according to acquisition
To output voltage control signal export the driving signal for controlling the output voltage of the object module output power circuit；
The control terminal of the object module output power circuit is connected with the output end of the output voltage driving circuit, for defeated
The output voltage to match out with the driving signal.
6. current flowing backwards protective device according to claim 5, which is characterized in that the sample circuit is resistance-type sampling
Circuit or mutual inductor sample circuit.
7. current flowing backwards protective device according to claim 6, which is characterized in that the single chip machine controlling circuit includes:
Adc circuit, processor and PWM output circuit；
The adc circuit, for obtaining the anti-sink current of output arrived through the sampling circuit samples；
The processor, for the anti-sink current sampled signal of output to be compared with preset reference signal, according to default
Loop algorithm generate it is matching with comparison result, described pre- for keeping the anti-sink current sampled signal of the output to be not more than
If the output voltage control signal of reference signal；
PWM output circuit is exported for the output voltage control signal to be converted to pwm control signal.
8. current flowing backwards protective device according to claim 7, which is characterized in that the adc circuit is specifically used for:
Using low-pass filter by by the sampling circuit samples to the anti-sink current of output sampled after export.
9. current flowing backwards protective device according to claim 5, which is characterized in that the preset loop algorithm is position
Formula pid algorithm, increment type PID algorithm, 2P2Z algorithm or 3P3Z algorithm.
10. a kind of circuit of synchronous rectification characterized by comprising the protection of current flowing backwards described in claim 5-9 any one
Device, wherein the main power circuit in the circuit of synchronous rectification is as the object module output power circuit.
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| CN201610301494.6A CN105871186B (en) | 2016-05-09 | 2016-05-09 | A kind of current flowing backwards guard method, device and circuit of synchronous rectification |
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| CN111509962A (en) * | 2020-05-26 | 2020-08-07 | 深圳市雷能混合集成电路有限公司 | Control method and device for preventing current backflow and power supply equipment |
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| CN105871186A (en) | 2016-08-17 |
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