CN110365216A - Current sampling circuit and full-bridge switching power supply circuit - Google Patents
Current sampling circuit and full-bridge switching power supply circuit Download PDFInfo
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- CN110365216A CN110365216A CN201910703645.4A CN201910703645A CN110365216A CN 110365216 A CN110365216 A CN 110365216A CN 201910703645 A CN201910703645 A CN 201910703645A CN 110365216 A CN110365216 A CN 110365216A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electronic Switches (AREA)
Abstract
The present invention relates to a kind of current sampling circuit and full-bridge switching power supply circuit, switch control module exports first switch signal and second switch signal.First switch tube and the first controlled switch is connected in first switch signal, and the first current transformer can generate induced current according to the electric current of first switch tube according to the coupling between former secondary coil.Second switch and the second controlled switch is connected in second switch signal, and the second current transformer can generate induced current according to the electric current of second switch according to the coupling between former secondary coil.Further, current sampling module carries out current sample to the induced current of the first current transformer secondary coil electric current or the second current transformer secondary coil, obtains forward current sampling.In zero load and at light load, the electric current in first switch tube and second switch is reversed, and the induced current of the first current transformer secondary coil electric current or the second current transformer secondary coil is on the contrary, current sampling module can get reverse current sampling.
Description
Technical field
The present invention relates to switch power technology fields, more particularly to a kind of current sampling circuit and full-bridge switching power supply electricity
Road.
Background technique
Switching Power Supply is essential critical component in contemporary electronic systems as a kind of device for converting electric energy.With
Science and technology be constantly progressive, requirement of the people to Switching Power Supply is also higher and higher, full-bridge switching power supply route due to high-efficient,
It is widely used in modern Switching Power Supply.It wherein, is the effect for further increasing full-bridge switching power supply using synchronous rectification
One of the important means of rate.In full-bridge switching power supply, current signal is very crucial signal, current loop control, overcurrent and
Short-circuit protection and parallel current-sharing etc. are both needed to obtain current signal.Therefore, in full-bridge switching power supply, pass through current sampling circuit
Carrying out current sample is essential technological means.
Meanwhile reverse current will appear using the full-bridge switching power supply of synchronous rectification at light load unloaded.So
And traditional current sampling circuit can not simultaneously sample forward current and reverse current.
Summary of the invention
Based on this, it is necessary to can not be adopted simultaneously to forward current and reverse current for traditional current sampling circuit
The defect of sample provides a kind of current sampling circuit.
A kind of current sampling circuit, which is characterized in that controlled opened including switch control module, current sampling module, first
Pass, the second controlled switch, the first current transformer and the second current transformer；
Switch control module is used to export the controlled end and full-bridge circuit of first switch signal to the first controlled switch
The grid of the first switch tube of bridge arm；Switch control module is used to export the controlled end of second switch signal to the second controlled switch
And the grid of the second switch of full-bridge circuit lower bridge arm；Wherein, first switch tube and second switch are non-to pipe；First opens
OFF signal is for being connected first switch tube, and second switch signal is for being connected second switch；
The first switch end of first controlled switch connects the first end of the first current transformer secondary coil, and first controlled opens
The second switch end of pass connects the second end of the first current transformer secondary coil；First controlled switch is used to controlled open first
When the controlled end of pass receives first switch signal, the first switch end and second switch end of the first controlled switch is connected；
The first switch end of second controlled switch connects the first end of the second current transformer secondary coil, and second controlled opens
The second switch end of pass connects the second end of the second current transformer secondary coil；Second controlled switch is used to controlled open second
When the controlled end of pass receives second switch signal, the first switch end and second switch end of the second controlled switch is connected；
First current transformer primary coil is connected in series on full-bridge circuit in bridge arm, for first switch tube, the
One switching tube constitutes circuit to pipe and input voltage source；
Second current transformer primary coil is connected in series in full-bridge circuit lower bridge arm, for second switch, the
Two switching tubes constitute circuit to pipe and input voltage source；
Current sampling module is for sampling the induced current of the first current transformer secondary coil, and for the
The induced current of two current transformer secondary coils is sampled.
Above-mentioned current sampling circuit, switch control module export first switch signal and second switch signal.Wherein, first
First switch tube and the first controlled switch is connected in switching signal, and the first current transformer can be according to the coupling between former secondary coil
It closes, induced current is generated according to the electric current of first switch tube.Similarly, second switch signal opens second switch and second controlled
Conducting is closed, the second current transformer can generate induced electricity according to the electric current of second switch according to the coupling between former secondary coil
Stream.Further, current sampling module is to the first current transformer secondary coil electric current or the second current transformer secondary coil
Induced current carry out current sample, obtain forward current sampling.Meanwhile in zero load and at light load, first switch tube and second
Electric current in switching tube is reversed, the induced electricity of the first current transformer secondary coil electric current or the second current transformer secondary coil
Stream is on the contrary, current sampling module can get reverse current sampling.
It in one of the embodiments, further include the first reset resistor and the second reset resistor；
First reset resistor is connected in the first current transformer secondary coil both ends in parallel, and the second reset resistor is connected in parallel
At the second current transformer secondary coil both ends.
It in one of the embodiments, further include the first sampling resistor and the second sampling resistor；
The first end of first sampling resistor connects the first end of the first controlled switch, the second end difference of the first sampling resistor
Connect the first end and current sampling module of the first current transformer secondary coil；
The first end of second sampling resistor connects the first end of the second controlled switch, the second end difference of the second sampling resistor
Connect the first end and current sampling module of the second current transformer secondary coil.
It in one of the embodiments, further include the first drive module and the second drive module；
First drive module drives first switch tube to lead for receiving first switch signal, and by first switch signal
It is logical；
Second drive module drives second switch to lead for receiving second switch signal, and by second switch signal
It is logical.
It in one of the embodiments, further include third controlled switch and the 4th controlled switch；
The first switch end of third controlled switch enters the induced current of the first current transformer secondary coil, and third is controlled to be opened
The second switch end of pass connects current sampling module；Third controlled switch is also used to receive in the controlled end of third controlled switch
When first switch signal, the first switch end and second switch end of third controlled switch is connected；
The first switch end of 4th controlled switch enters the induced current of the second current transformer secondary coil, and the 4th controlled opens
The second switch end of pass connects current sampling module；4th controlled switch is also used to receive in the controlled end of the 4th controlled switch
When second switch signal, the first switch end and second switch end of the 4th controlled switch is connected.
The first controlled switch includes the first N-type metal-oxide-semiconductor in one of the embodiments,；Second controlled switch includes the 2nd N
Type metal-oxide-semiconductor；
The grid of first N-type metal-oxide-semiconductor is for receiving first switch signal；The source electrode of first N-type metal-oxide-semiconductor connects the first electric current
The first end of mutual inductor secondary coil, and for being grounded；The drain electrode of first N-type metal-oxide-semiconductor connects the first current transformer pair sideline
The second end of circle；
The grid of second N-type metal-oxide-semiconductor is for receiving second switch signal；The source electrode of second N-type metal-oxide-semiconductor connects the second electric current
The first end of mutual inductor secondary coil, and for being grounded；The drain electrode of second N-type metal-oxide-semiconductor connects the second current transformer pair sideline
The second end of circle.
Third controlled switch includes third N-type metal-oxide-semiconductor and the 4th N-type metal-oxide-semiconductor in one of the embodiments,；4th by
Control switch includes the 5th N-type metal-oxide-semiconductor and the 6th N-type metal-oxide-semiconductor；
The source electrode of source electrode the 4th N-type metal-oxide-semiconductor of connection of third N-type metal-oxide-semiconductor, third N-type metal-oxide-semiconductor and the 4th N-type metal-oxide-semiconductor
Grid is used to receive first switch signal, and the drain electrode of third N-type metal-oxide-semiconductor is for receiving the first current transformer secondary coil
The drain electrode of induced current, the 4th N-type metal-oxide-semiconductor connects current sampling module；
The source electrode of source electrode the 6th N-type metal-oxide-semiconductor of connection of 5th N-type metal-oxide-semiconductor, the 5th N-type metal-oxide-semiconductor and the 6th N-type metal-oxide-semiconductor
Grid is used to receive second switch signal, and the drain electrode of the 5th N-type metal-oxide-semiconductor is for receiving the second current transformer secondary coil
The drain electrode of induced current, the 6th N-type metal-oxide-semiconductor connects current sampling module.
Switch control module for exporting the first pulse signal and the second pulse letter respectively in one of the embodiments,
Number；Wherein, the first pulse signal and the second pulse signal misphase 180 degree；
First switch signal is the high level of the first pulse signal, and second switch signal is the height electricity of the second pulse signal
It is flat.
The duty ratio of high level is less than or equal to 50% in the first pulse signal in one of the embodiments,；Second pulse
The duty ratio of high level is less than or equal to 50% in signal.
A kind of full-bridge switching power supply circuit, including full-bridge circuit, transformer, rectification circuit and any of the above-described embodiment
Current sampling circuit, the first current transformer primary coil are connected in series on full-bridge circuit in bridge arm, are used for and first switch
Pipe, first switch tube to pipe and input voltage source constitute circuit；Second current transformer primary coil is connected in series in entirely
In bridge circuit lower bridge arm, for pipe and input voltage source constituting circuit with second switch, second switch；
Transformer one end connects upper bridge arm midpoint, and the transformer other end connects lower bridge arm midpoint；
Rectification circuit is separately connected transformer secondary coil both ends.
Above-mentioned full-bridge switching power supply circuit, switch control module export first switch signal and second switch signal.Wherein,
First switch tube and the first controlled switch is connected in first switch signal, and the first current transformer can be according between former secondary coil
Coupling generates induced current according to the electric current of first switch tube.Similarly, second switch signal makes second switch and second controlled
Switch conduction, the second current transformer can generate according to the electric current of second switch and incude according to the coupling between former secondary coil
Electric current.Further, current sampling module is to the first current transformer secondary coil electric current or the second current transformer pair sideline
The induced current of circle carries out current sample, obtains forward current sampling.Meanwhile unloaded and at light load, first switch tube and the
Electric current in two switching tubes is reversed, the induction of the first current transformer secondary coil electric current or the second current transformer secondary coil
Electric current is on the contrary, current sampling module can get reverse current sampling.
Detailed description of the invention
Fig. 1 is the electrical current sampling circuit module structure chart of an embodiment；
Fig. 2 is the electrical current sampling circuit module structure chart of another embodiment；
Fig. 3 is the current sampling circuit figure of an embodiment；
Fig. 4 is the full-bridge switching power supply circuit diagram of an embodiment.
Specific embodiment
Purpose, technical solution and technical effect for a better understanding of the present invention, below in conjunction with drawings and examples
Further explaining illustration is carried out to the present invention.State simultaneously, embodiments described below for explaining only the invention, not
For limiting the present invention
The embodiment of the present invention provides a kind of current sampling circuit.
Fig. 1 is the electrical current sampling circuit module structure chart of an embodiment, as shown in Figure 1, the electric current of an embodiment is adopted
Sample circuit includes switch control module 100, current sampling module 101, the first controlled switch 102, the second controlled switch 103,
One Current Transmit 1 and the second Current Transmit 2；
Switch control module 100 is for exporting first switch signal K1 to the controlled end of the first controlled switch 102 and complete
The grid of the first switch tube Q1 of bridge arm on bridge circuit；Switch control module 100 is for exporting second switch signal K2 to second
The grid of the second switch Q2 of the controlled end and full-bridge circuit lower bridge arm of controlled switch 103；Wherein, first switch tube Q1 with
Second switch Q2 is non-to pipe；First switch signal K1 is for being connected first switch tube Q1, and second switch signal K2 is for making
Second switch Q2 conducting；
Wherein, switch control module 100 generates double switch signal respectively, all the way first switch signal K1, and all the way second
Switching signal K2.First switch signal K1 is not interfere with each other with second switch signal K2.Switch control in one of the embodiments,
Module 100 includes single-chip microcontroller or PWM controller.PWM control is selected as preferably embodiment, a switch control module 100
Device processed.When selecting PWM controller, switch control module 100 for exporting the first pulse signal and the second pulse signal respectively；
First pulse signal and the second pulse signal misphase 180 degree in one of the embodiments,；
Wherein, by the first pulse signal and the second pulse signal misphase 180 degree, make the first controlled switch 102 and second
Controlled switch 103 is staggered turn-on time, obtains 1 secondary coil of the first Current Transmit respectively convenient for current sampling module 101
2 secondary coil of induced current CSL and the second Current Transmit induced current CSR, prevent two faradic mutually relevant
It disturbs, guarantees the independence of sampling.It should be noted that the phase difference of the first pulse signal and the second pulse signal can be according to full-bridge electricity
The working method on road is adjusted, and guaranteeing the first controlled switch 102 and the second controlled switch 103, there is no when the conducting of overlapping
Between, the phase difference of the first pulse signal and the second pulse signal includes but is not limited to 180 degree.
First switch signal K1 is the high level of the first pulse signal, and second switch signal K2 is the height of the second pulse signal
Level.
Wherein, there are high level and low level, the first output of pulse signal to the first controlled switch 102 for the first pulse signal
Controlled end, when the controlled end of the first controlled switch 102 receives high level, the first controlled switch 102 conducting, first switch
Pipe Q1 conducting.Similarly, when the controlled end of the second controlled switch 103 receives high level, the conducting of the second controlled switch 103, second
Switching tube Q2 conducting.
The duty ratio of high level is less than or equal to 50% in the first pulse signal in one of the embodiments,；Second pulse
The duty ratio of high level is less than or equal to 50% in signal.
Wherein, the duty ratio of high level is less than or equal to 50%, i.e. leading in the first controlled switch 102 in the first pulse signal
Clearance is broken Zhou Qizhong, and the turn-off time of the first controlled switch 102 is more than or equal to the 50% of conducting shutdown period.It controlled is opened first
When closing 102 shutdown, the first Current Transmit 1 resets, and by the setting of the duty ratio of high level in the first pulse signal, avoids
First Current Transmit 1 saturation, to be easy to the reset of the first Current Transmit 1.Second pulse signal similarly, passes through the second arteries and veins
The setting for rushing the duty ratio of high level in signal avoids the second Current Transmit 2 from being saturated, to be easy to the second current transformer
CT2 resets.
The first end of first switch end connection 1 secondary coil of the first Current Transmit of first controlled switch 102, first
The second end of second switch end connection 1 secondary coil of the first Current Transmit of controlled switch 102；First controlled switch 102
For the first of the first controlled switch 102 to be connected when the controlled end of the first controlled switch 102 receives first switch signal K1
Switch terminals and second switch end；
The first end of first switch end connection 2 secondary coil of the second Current Transmit of second controlled switch 103, second
The second end of second switch end connection 2 secondary coil of the second Current Transmit of controlled switch 103；Second controlled switch 103
For the first of the second controlled switch 103 to be connected when the controlled end of the second controlled switch 103 receives second switch signal K2
Switch terminals and second switch end；
First Current Transmit, 1 primary coil is connected in series on full-bridge circuit in bridge arm, is used for and first switch tube
Q1, first switch tube Q1 to pipe and input voltage source constitute circuit；
As shown in Figure 1, Fig. 1 connects input voltage source positive input with the first end of 1 primary coil of the first Current Transmit,
For the drain electrode of the second end connection first switch tube Q1 of first Current Transmit, 1 primary coil, the first Current Mutual Inductance is explained
Device CT1 primary coil is connected in series on full-bridge circuit one embodiment in bridge arm.It should be noted that on full-bridge circuit
Bridge arm includes two switching tubes, when selecting different switching tubes, 1 primary coil of the first Current Transmit and switching tube connection
Difference will not repeat them here.
Wherein, first switch signal K1 can be such that first switch tube Q1 is connected, and after first switch tube Q1 conducting, the first electric current is mutual
The primary coil of sensor CT1 flows through the forward current of full-bridge circuit, passes through 1 primary coil of the first Current Transmit and secondary sideline
The coupling of circle, under conditions of the conducting of the first controlled switch 102, the secondary coil of the first Current Transmit 1 generates induced electricity
Stream.Current sampling module 101 obtains for sampling to the induced current CSL of 1 secondary coil of the first Current Transmit
One current sampling signal.
Second Current Transmit, 2 primary coil is connected in series in full-bridge circuit lower bridge arm, is used for and second switch
Q2, second switch Q2 to pipe and input voltage source constitute circuit；
As shown in Figure 1, Fig. 1 connects input voltage source positive input with the first end of 2 primary coil of the second Current Transmit,
For the drain electrode of the second end connection second switch Q2 of second Current Transmit, 2 primary coil, the second Current Mutual Inductance is explained
Device CT2 primary coil is connected in series in one embodiment in full-bridge circuit lower bridge arm.It should be noted that under full-bridge circuit
Bridge arm includes two switching tubes, when selecting different switching tubes, 2 primary coil of the second Current Transmit and switching tube connection
Difference will not repeat them here.
Wherein, second switch signal K2 can be such that second switch Q2 is connected, and after second switch Q2 conducting, the second electric current is mutual
The primary coil of sensor CT2 flows through the forward current of full-bridge circuit, passes through 2 primary coil of the second Current Transmit and secondary sideline
The coupling of circle, under conditions of the conducting of the second controlled switch 103, the secondary coil of the second Current Transmit 2 generates induced electricity
Stream.Current sampling module 101 obtains for sampling to the induced current CSR of 2 secondary coil of the second Current Transmit
Two current sampling signals.
Current sampling module 101 is used to sample the induced current CSL of 1 secondary coil of the first Current Transmit,
And for being sampled to the induced current CSR of 2 secondary coil of the second Current Transmit.
Current sampling module 101 includes current sampling circuit or current sample chip in one of the embodiments,.
Fig. 2 is the electrical current sampling circuit module structure chart of another embodiment in one of the embodiments, such as Fig. 2 institute
Show, the current sampling circuit of another embodiment further includes the first drive module DR1 and the second drive module DR2；
First drive module DR1 is opened for receiving first switch signal K1, and by first switch signal K1 driving first
Close pipe Q1 conducting；
Wherein, the first drive module DR1 is used to be converted to first switch signal K1 the driving of driving first switch tube Q1
Signal.The first drive module DR1 includes drive amplification circuit or amplifier in one of the embodiments, for amplifying switch
The first switch signal K1 that control module 100 exports improves the driving capability of first switch signal K1.
Second drive module DR2 is opened for receiving second switch signal K2, and by second switch signal K2 driving second
Close pipe Q2 conducting.
Wherein, the second drive module DR2 is used to be converted to second switch signal K2 the driving of driving second switch Q2
Signal.The second drive module DR2 includes drive amplification circuit or amplifier in one of the embodiments, for amplifying switch
The second switch signal K2 that control module 100 exports improves the driving capability of second switch signal K2.
In one of the embodiments, as shown in Fig. 2, the current sampling circuit of another embodiment further includes that third is controlled
Switch and the 4th controlled switch；
The first switch end of third controlled switch enters the induced current CSL of 1 secondary coil of the first Current Transmit, third
The second switch end of controlled switch connects current sampling module 101；Third controlled switch be also used to third controlled switch by
When control termination receives first switch signal K1, the first switch end and second switch end of third controlled switch is connected；
Wherein, switch control module 100 is when exporting first switch signal K1,1 secondary coil of the first Current Transmit
Generate induced current.The controlled end of third controlled switch receives first switch signal K1 at this time, and the first of third controlled switch
Switch terminals are connected with second switch end, make the induced current CSL of 1 secondary coil of the first Current Transmit that can be transmitted to electric current and adopt
Egf block 101.Meanwhile switch control module 100 does not export second switch signal K2 when exporting first switch signal K1, this
When the 4th controlled switch first switch end and second switch end turn off, prevent the sense of 2 secondary coil of the second Current Transmit
Electric current CSR is answered to be transmitted to current sampling module 101.Based on this, the induced current of 1 secondary coil of the first Current Transmit is prevented
CSL influences each other with the induced current CSR's of 2 secondary coil of the second Current Transmit.
The first switch end of 4th controlled switch enters the induced current CSR of 2 secondary coil of the second Current Transmit, and the 4th
The second switch end of controlled switch connects current sampling module 101；4th controlled switch be also used to the 4th controlled switch by
When control termination receives second switch signal K2, the first switch end and second switch end of the 4th controlled switch is connected.
Wherein, the working principle of the 4th controlled switch is the same as third controlled switch.
Relay, electronics can be selected in the first controlled switch 102 and the second controlled switch 103 in one of the embodiments,
Switch or switching tube etc..It is selected as preferably embodiment, first controlled switch 102 with the second controlled switch 103
Field-effect tube in switching tube, in order to realize the PWM control to the first controlled switch 102 and the second controlled switch 103.
Below by taking the first controlled switch 102 and the second controlled switch 103 select N-type field-effect tube as an example, to first by
Control switch 102 and the type selecting of the second controlled switch 103 explain.Fig. 3 is the current sampling circuit figure of an embodiment, is such as schemed
Shown in 3, the first controlled switch 102 includes the first N-type metal-oxide-semiconductor D1；Second controlled switch 103 includes the second N-type metal-oxide-semiconductor D2；
The grid of first N-type metal-oxide-semiconductor D1 is for receiving first switch signal K1；The source electrode connection the of first N-type metal-oxide-semiconductor D1
The first end of one Current Transmit, 1 secondary coil, and for being grounded；It is mutual that the drain electrode of first N-type metal-oxide-semiconductor D1 connects the first electric current
The second end of sensor CT1 secondary coil；
The grid of second N-type metal-oxide-semiconductor D2 is for receiving second switch signal K2；The source electrode connection the of second N-type metal-oxide-semiconductor D2
The first end of two Current Transmits, 2 secondary coil, and for being grounded；It is mutual that the drain electrode of second N-type metal-oxide-semiconductor D2 connects the second electric current
The second end of sensor CT2 secondary coil.
As shown in figure 3, the N-type metal-oxide-semiconductor D1 of first switch signal K1 (high level) to first that switch control module 100 exports
Grid, the source electrode of the first N-type metal-oxide-semiconductor D1 and drain electrode be connected, and the both ends of 1 secondary coil of the first Current Transmit constitute complete
Circuit, in order to 1 secondary coil of the first Current Transmit formed induced current.Similarly, it is exported in switch control module 100
The N-type metal-oxide-semiconductor D2 of second switch signal K2 (high level) to second grid, the source electrode of the second N-type metal-oxide-semiconductor D2 leads with drain electrode
Logical, the both ends of 2 secondary coil of the second Current Transmit constitute complete circuit, in order to the secondary side of the second Current Transmit 2
Coil forms induced current.
In one of the embodiments, as shown in figure 3, the current sampling circuit of an embodiment further includes the first reset electricity
Hinder R1 and the second reset resistor R2；
First reset resistor R1 is connected in 1 secondary coil both ends of the first Current Transmit, the second reset resistor R2 in parallel
It is connected in 2 secondary coil both ends of the second Current Transmit in parallel.
Wherein, the first reset resistor R1 is used to reset for the first Current Transmit 1, and the second reset resistor R2 is used to be the
Two Current Transmits 2 reset.
In one of the embodiments, as shown in figure 3, the current sampling circuit of an embodiment further includes the first sampling electricity
Hinder R3 and the second sampling resistor R4；
The first end of first sampling resistor R3 connects the first end of the first controlled switch 102, and the of the first sampling resistor R3
Two ends are separately connected the first end and current sampling module 101 of 1 secondary coil of the first Current Transmit；
The first end of second sampling resistor R4 connects the first end of the second controlled switch 103, and the of the second sampling resistor R4
Two ends are separately connected the first end and current sampling module 101 of 2 secondary coil of the second Current Transmit.
Wherein, by the setting of the first sampling resistor R3, convenient for by the induced electricity of 1 secondary coil of the first Current Transmit
Stream CSL is transferred to current sampling module 101.Similarly, the setting of the second sampling resistor R4 is also easy for the second current transformer
The induced current CSR of CT2 secondary coil is transferred to current sampling module 101.
Wherein, corresponding identical first switch signal K1 and second switch signal K2, third controlled switch and the 4th controlled
Relay, electronic switch or switching tube etc. also can be selected in switch.As a preferably embodiment, third controlled switch and
Four controlled switch select the field-effect tube in switching tube, in order to realize to the first controlled switch 102 and the second controlled switch
103 PWM control.
It is in one of the embodiments, the switching effect that third controlled switch and the 4th controlled switch is better achieved,
As shown in figure 3, third controlled switch includes third N-type metal-oxide-semiconductor D3 and the 4th N-type metal-oxide-semiconductor D4；4th controlled switch includes the 5th
N-type metal-oxide-semiconductor D5 and the 6th N-type metal-oxide-semiconductor D6；
The source electrode of third N-type metal-oxide-semiconductor D3 connects the source electrode of the 4th N-type metal-oxide-semiconductor D4, third N-type metal-oxide-semiconductor D3 and the 4th N-type
The grid of metal-oxide-semiconductor D4 is used to receive first switch signal K1, and the drain electrode of third N-type metal-oxide-semiconductor D3 is mutual for receiving the first electric current
The drain electrode of the induced current CSL, the 4th N-type metal-oxide-semiconductor D4 of sensor CT1 secondary coil connect current sampling module 101；
The source electrode of 5th N-type metal-oxide-semiconductor D5 connects the source electrode of the 6th N-type metal-oxide-semiconductor D6, the 5th N-type metal-oxide-semiconductor D5 and the 6th N-type
The grid of metal-oxide-semiconductor D6 is used to receive second switch signal K2, and the drain electrode of the 5th N-type metal-oxide-semiconductor D5 is mutual for receiving the second electric current
The drain electrode of the induced current CSR, the 6th N-type metal-oxide-semiconductor D6 of sensor CT2 secondary coil connect current sampling module 101.
Wherein, as shown in figure 3, the first switch signal K1 (high level) exported in switch control module 100 is to third N-type
The grid of the grid of metal-oxide-semiconductor D3 and the 4th N-type metal-oxide-semiconductor D4, third N-type metal-oxide-semiconductor D3 and the 4th N-type metal-oxide-semiconductor D4 conducting, the first electricity
The induced current CSL of current transformer CT1 secondary coil may be output to current sampling module 101.Similarly, in switch control module
The second switch signal K2 (high level) of 100 outputs to the grid of the 5th N-type metal-oxide-semiconductor D5 and the grid of the 6th N-type metal-oxide-semiconductor D6,
5th N-type metal-oxide-semiconductor D5 and the 6th N-type metal-oxide-semiconductor D6 conducting, the induced current CSR of 2 secondary coil of the second Current Transmit can be defeated
Out to current sampling module 101.
The full-bridge switching power supply circuit of any of the above-described embodiment, switch control module 100 export first switch signal K1 and
Second switch signal K2.Wherein, first switch tube Q1 and the first controlled switch 102 is connected in first switch signal K1, the first electricity
Current transformer CT1 can generate induced current according to the electric current of first switch tube Q1 according to the coupling between former secondary coil.Similarly,
Second switch Q2 and the second controlled switch 103 is connected in second switch signal K2, and the second Current Transmit 2 can be according to former secondary
Coupling between the circle of sideline generates induced current according to the electric current of second switch Q2.Further, current sampling module 101 is right
The induced current CSR of first Current Transmit, 1 secondary coil electric current or 2 secondary coil of the second Current Transmit carries out electric current
Sampling obtains forward current sampling.Meanwhile the electric current in zero load and at light load, in first switch tube Q1 and second switch Q2
Reversely, the induced current CSR phase of 1 secondary coil electric current of the first Current Transmit or 2 secondary coil of the second Current Transmit
Instead, current sampling module 101 can get reverse current sampling.
The embodiment of the present invention also provides a kind of full-bridge switching power supply circuit.
Fig. 4 is the full-bridge switching power supply circuit diagram of an embodiment, as shown in figure 4, the full-bridge switch electricity of an embodiment
Source circuit includes full-bridge circuit, transformer CT3, rectification circuit 300 and the current sample such as claim 1 to 9 any one
Circuit, which is characterized in that 1 primary coil of the first Current Transmit is connected in series on full-bridge circuit in bridge arm, for the
One switching tube Q1, first switch tube Q1 to pipe and input voltage source constitute circuit；Second Current Transmit, 2 primary coil
Be connected in series in full-bridge circuit lower bridge arm, for second switch Q2, second switch Q2 to pipe and input voltage source
Constitute circuit；
Wherein, as shown in figure 4, full-bridge circuit includes first switch tube Q1, second switch Q2, third switching tube Q3 and
Four switching tube Q4.First switch tube Q1 and the 4th switching tube Q4 is constituted to pipe, and second switch Q2 and third switching tube Q3 are constituted
To pipe.First switch tube Q1 and third switching tube Q3 constitutes the upper bridge arm of full-bridge circuit, second switch Q2 and the 4th switching tube
The lower bridge arm of Q4 composition full-bridge circuit.
Transformer one end connects upper bridge arm midpoint, and the transformer other end connects lower bridge arm midpoint；
Rectification circuit is separately connected transformer secondary coil both ends.
Above-mentioned full-bridge switching power supply circuit, switch control module 100 export first switch signal K1 and second switch signal
K2.Wherein, first switch tube Q1 and the first controlled switch 102 is connected in first switch signal K1, and the first Current Transmit 1 can
According to the coupling between former secondary coil, induced current is generated according to the electric current of first switch tube Q1.Similarly, second switch signal K2
Second switch Q2 and the second controlled switch 103 is connected, the second Current Transmit 2 can be according to the coupling between former secondary coil
It closes, induced current is generated according to the electric current of second switch Q2.Further, current sampling module 101 is to the first Current Mutual Inductance
The induced current CSR of 2 secondary coil of device CT1 secondary coil electric current or the second Current Transmit carries out current sample, obtains just
To current sample.Meanwhile in zero load and at light load, the electric current in first switch tube Q1 and second switch Q2 is reversed, the first electricity
The induced current CSR of 2 secondary coil of current transformer CT1 secondary coil electric current or the second Current Transmit is on the contrary, current sample
Module 101 can get reverse current sampling.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
Only several embodiments of the present invention are expressed for above embodiments, and the description thereof is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from present inventive concept, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.
Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of current sampling circuit, which is characterized in that including switch control module, current sampling module, the first controlled switch,
Second controlled switch, the first current transformer and the second current transformer；
The switch control module is used to export the controlled end and full-bridge circuit of first switch signal to the first controlled switch
The grid of the first switch tube of bridge arm；The switch control module be used to export second switch signal to second controlled switch by
Control the grid of the second switch of end and full-bridge circuit lower bridge arm；Wherein, the first switch tube and the second switch
It is non-to pipe；The first switch signal is for being connected the first switch tube, and the second switch signal is for making described the
The conducting of two switching tubes；
The first switch end of first controlled switch connects the first end of the first current transformer secondary coil, and described
The second switch end of one controlled switch connects the second end of the first current transformer secondary coil；First controlled switch
For first controlled switch to be connected when the controlled end of first controlled switch receives the first switch signal
First switch end and second switch end；
The first switch end of second controlled switch connects the first end of the second current transformer secondary coil, and described
The second switch end of two controlled switch connects the second end of the second current transformer secondary coil；Second controlled switch
For second controlled switch to be connected when the controlled end of second controlled switch receives the second switch signal
First switch end and second switch end；
The first current transformer primary coil is connected in series on full-bridge circuit in bridge arm, is used for and the first switch
Pipe, the first switch tube to pipe and input voltage source constitute circuit；
The second current transformer primary coil is connected in series in full-bridge circuit lower bridge arm, is used for and the second switch
Pipe, the second switch to pipe and input voltage source constitute circuit；
The current sampling module is used for for sampling to the induced current of the first current transformer secondary coil
The induced current of the second current transformer secondary coil is sampled.
2. current sampling circuit according to claim 1, which is characterized in that further include that the first reset resistor and second reset
Resistance；
First reset resistor is connected in the first current transformer secondary coil both ends, second reset resistor in parallel
It is connected in the second current transformer secondary coil both ends in parallel.
3. current sampling circuit according to claim 1, which is characterized in that further include the first sampling resistor and the second sampling
Resistance；
The first end of first sampling resistor connects the first end of first controlled switch, and the of first sampling resistor
Two ends are separately connected the first end and the current sampling module of the first current transformer secondary coil；
The first end of second sampling resistor connects the first end of second controlled switch, and the of second sampling resistor
Two ends are separately connected the first end and the current sampling module of the second current transformer secondary coil.
4. current sampling circuit according to claim 1, which is characterized in that further include the first drive module and the second driving
Module；
First drive module passes through first switch signal driving described for receiving the first switch signal
The conducting of one switching tube；
Second drive module drives described for receiving the second switch signal, and by the second switch signal
The conducting of two switching tubes.
5. current sampling circuit according to claim 1, which is characterized in that further include that third controlled switch and the 4th are controlled
Switch；
The first switch end of the third controlled switch enters the induced current of the first current transformer secondary coil, and described
The second switch end of three controlled switch connects the current sampling module；The third controlled switch be also used to the third by
When the controlled end of control switch receives the first switch signal, the first switch end and second of the third controlled switch is connected
Switch terminals；
The first switch end of 4th controlled switch enters the induced current of the second current transformer secondary coil, and described
The second switch end of four controlled switch connects the current sampling module；4th controlled switch be also used to the described 4th by
When the controlled end of control switch receives the second switch signal, the first switch end and second of the 4th controlled switch is connected
Switch terminals.
6. according to claim 1 to current sampling circuit described in 5 any one, which is characterized in that first controlled switch
Including the first N-type metal-oxide-semiconductor；Second controlled switch includes the second N-type metal-oxide-semiconductor；
The grid of the first N-type metal-oxide-semiconductor is for receiving the first switch signal；The source electrode of the first N-type metal-oxide-semiconductor connects
The first end of the first current transformer secondary coil, and for being grounded；Described in the drain electrode connection of the first N-type metal-oxide-semiconductor
The second end of first current transformer secondary coil；
The grid of the second N-type metal-oxide-semiconductor is for receiving the second switch signal；The source electrode of the second N-type metal-oxide-semiconductor connects
The first end of the second current transformer secondary coil, and for being grounded；Described in the drain electrode connection of the second N-type metal-oxide-semiconductor
The second end of second current transformer secondary coil.
7. according to current sampling circuit described in claim 5 any one, which is characterized in that the third controlled switch includes
Third N-type metal-oxide-semiconductor and the 4th N-type metal-oxide-semiconductor；4th controlled switch includes the 5th N-type metal-oxide-semiconductor and the 6th N-type metal-oxide-semiconductor；
The source electrode of the third N-type metal-oxide-semiconductor connects the source electrode of the 4th N-type metal-oxide-semiconductor, the third N-type metal-oxide-semiconductor and described
The grid of four N-type metal-oxide-semiconductors is used to receive the first switch signal, and the drain electrode of the third N-type metal-oxide-semiconductor is described for receiving
The drain electrode of the induced current of first current transformer secondary coil, the 4th N-type metal-oxide-semiconductor connects the current sampling module；
The source electrode of the 5th N-type metal-oxide-semiconductor connects the source electrode of the 6th N-type metal-oxide-semiconductor, the 5th N-type metal-oxide-semiconductor and described
The grid of six N-type metal-oxide-semiconductors is used to receive the second switch signal, and the drain electrode of the 5th N-type metal-oxide-semiconductor is described for receiving
The drain electrode of the induced current of second current transformer secondary coil, the 6th N-type metal-oxide-semiconductor connects the current sampling module.
8. according to claim 1 to current sampling circuit described in 5 any one, which is characterized in that the switch control module
For exporting the first pulse signal and the second pulse signal respectively；
The first switch signal is the high level of first pulse signal, and the second switch signal is second pulse
The high level of signal.
9. current sampling circuit according to claim 8, which is characterized in that high level accounts in first pulse signal
Sky is than being less than or equal to 50%；The duty ratio of high level is less than or equal to 50% in second pulse signal.
10. a kind of full-bridge switching power supply circuit, which is characterized in that including full-bridge circuit, transformer, rectification circuit and such as right
It is required that current sampling circuit described in 1 to 9 any one, which is characterized in that the first current transformer primary coil series connection
Be connected on full-bridge circuit in bridge arm, for the first switch tube, the first switch tube to pipe and input voltage
Source constitutes circuit；The second current transformer primary coil is connected in series in full-bridge circuit lower bridge arm, for described the
Two switching tubes, the second switch to pipe and input voltage source constitute circuit；
Described transformer one end connects the upper bridge arm midpoint, described in the transformer other end connection
Lower bridge arm midpoint；
The rectification circuit is separately connected the transformer secondary coil both ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910703645.4A CN110365216A (en) | 2019-07-31 | 2019-07-31 | Current sampling circuit and full-bridge switching power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910703645.4A CN110365216A (en) | 2019-07-31 | 2019-07-31 | Current sampling circuit and full-bridge switching power supply circuit |
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| CN110365216A true CN110365216A (en) | 2019-10-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113687177A (en) * | 2021-10-25 | 2021-11-23 | 浙江富特科技股份有限公司 | Transformer bias magnetic detection circuit in bridge type isolated switch power supply |
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| CN101286415A (en) * | 2008-01-29 | 2008-10-15 | 艾默生网络能源有限公司 | A bidirectional sample and reset circuit for a current mutual inductor |
| US20140146585A1 (en) * | 2012-11-29 | 2014-05-29 | General Electric Company | System and method for power conversion |
| CN105652062A (en) * | 2014-11-21 | 2016-06-08 | 中国航空工业集团公司雷华电子技术研究所 | Current detection circuit of full bridge converter power loop |
| CN108566098A (en) * | 2018-06-26 | 2018-09-21 | 江苏兆能电子有限公司 | A kind of current sense link applied to full-bridge direct current-direct current converter |
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| CN101286415A (en) * | 2008-01-29 | 2008-10-15 | 艾默生网络能源有限公司 | A bidirectional sample and reset circuit for a current mutual inductor |
| US20140146585A1 (en) * | 2012-11-29 | 2014-05-29 | General Electric Company | System and method for power conversion |
| CN105652062A (en) * | 2014-11-21 | 2016-06-08 | 中国航空工业集团公司雷华电子技术研究所 | Current detection circuit of full bridge converter power loop |
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| CN113687177A (en) * | 2021-10-25 | 2021-11-23 | 浙江富特科技股份有限公司 | Transformer bias magnetic detection circuit in bridge type isolated switch power supply |
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