CN104242659B - Peak current sampling and signal processing circuit for full-bridge switching converter - Google Patents
Peak current sampling and signal processing circuit for full-bridge switching converter Download PDFInfo
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- CN104242659B CN104242659B CN201410542015.0A CN201410542015A CN104242659B CN 104242659 B CN104242659 B CN 104242659B CN 201410542015 A CN201410542015 A CN 201410542015A CN 104242659 B CN104242659 B CN 104242659B
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Abstract
The invention discloses a peak current sampling and signal processing circuit for a full-bridge switching converter. The peak current sampling and signal processing circuit for the full-bridge switching converter comprises a closed-loop Hall current sensor and a power supply of the closed-loop hall current sensor, an absolute value circuit and a waveform shaping circuit; a primary winding of a main transformer of the full-bridge switching converter penetrates primary current perforation of the closed-loop Hall current sensor. The peak current sampling and signal processing circuit for the full-bridge switching converter is used for peak current sampling and signal processing, in aspect of peak current sampling, effect of detection error of general current transformers on stability of a peak current-mode control loop is eliminated, incapacity of detecting current signals correctly due to bias and saturation of the general current transformers is reduced; in aspect of signal processing, the problem that a majority of current voltage-mode absolute value circuits is incapable of being applied to the transient current sampling signal processing of medium and large power full-bridge switching converters is solved, a current sampling circuit and a signal processing circuit can be common-grounded, the circuit is simple, and the cost is low.
Description
Technical field
The present invention relates to power technique fields, more particularly, to a kind of peak point current sampling for full-bridge switch converter and
Its signal processing circuit.
Background technology
Full-bridge switch converter as in, the preferred version of high power D C-DC converter, application is quite varied.Full-bridge is opened
The control strategy closing converter mainly includes peak-current mode control and voltage mode control, and the former needs sampling switch pipe
Transient current simultaneously directly participates in PWM and controls, and also can participate in overcurrent protection, short-circuit protection or transformer bias and magnetically saturated simultaneously
Protection；The latter needs the transient current of detection switch pipe to supply overcurrent protection, short-circuit protection, transformer bias and magnetic saturation protection
Circuit uses.Sensor sample to current signal be high frequency ac signal it is necessary to through high speed and precision absolute value circuit with
After waveform shaping circuit is processed, peak-current mode PWM pulse width modulator could be participated in as effective transient current signal
Pulse current one by one control process, and the protection of the overcurrent protection of pulse current or dynamic magnetic bias one by one.Therefore complete
In bridge switch converter, peak point current sampling and its signal processing circuit are extremely important.It is directed to full-bridge switch converter at this stage
The sampling of the high-frequency pulse current of main transformer primary side and signal transacting, generally following three kinds of modes：
(1) electric current, the sample rate current warp of output are detected by the current transformer being connected on full-bridge circuit main transformer side
Cross the full-bridge rectifier rectification of diode composition, finally on resistance, current signal is converted into voltage signal, participate in PWM and control
Or switching tube excessively stream short-circuit protection.There is larger ratio difference and angular difference value in common current transformer in measurement process, should
Error is caused by exciting current.Exciting current is that magnetic device sets up the electric current that magnetic field consumed it is impossible to be converted into output voltage
Signal, but error can be introduced to the measurement of electric current.This error may affect control loop in peak-current mode control
Stability, lead to the output current of DC-DC converter that the big small echo of similar subharmonic oscillation occurs, output current ripple is notable
Increase.Secondly, recommending, in the bipolarity converter such as full-bridge, in theory, main transformer primary side flows through the bipolar of Symmetrical
Property current impulse, does not have DC component, current transformer magnetic core energy normal reset in each zero passage of current impulse.But due to device
The difference of part characteristic, magnetic bias is more or less constantly present, and changing with external factor such as the change loading and temperature rises
Become, the hunting range of magnetic linkage also has slow drift.If the magnetic core of current transformer can not reset, magnetic core will be led to gradually
Saturation.CT saturation is a very serious problem, is the electric current that can not correctly detect main transformer primary side first
Value, thus effective current control can not be carried out；Secondly, excessively stream or short-circuit protection circuit are likely to occur misoperation.
(2) current sample is carried out using closed-loop Hall current sensor, then the current signal of output is passed through detection electricity
Resistance is converted into voltage signal.Signal transacting adopts the absolute value circuit of voltage mode.The absolute value circuit of voltage mode is typically adopted
Realize active precision rectifying with operational amplifier and diode.Voltage-mode rectification with voltage as variable, to voltage in voltage domain
Signal is processed, and its core devices is Voltage Feedback operational amplifier.Due to the gain bandwidth that Voltage Feedback amplifier is constant
Long-pending and relatively low slew rate, the rectification to high frequency, small-signal, can produce serious error, or even circuit all cannot normal work
Make.Although the error of voltage mode absolute value circuit can be reduced using the high Voltage Feedback operational amplifier of broadband, slew rate,
But its expensive price can make the cost of voltage mode absolute value circuit greatly increase.In at present, the conversion of high-power full-bridge switch
In 20KHz～100KHz, current waveform is quasi-retangular wave to the switching frequency of device, and dynamic range is big, can be under these conditions
The cost performance of the voltage mode absolute value circuit of works fine is extremely low.
(3) current sample, the full-bridge rectifier of fast recovery rectifier diode composition are carried out using closed-loop Hall current sensor
Directly carry out rectification in Hall element signal output part, the good current signal of rectification is added in detection resistance, just can obtain
The complete absolute value voltage signal of rule.But the input and output side of full bridge rectifier circuit can not have common port, therefore, electric current
The signal ground of sample circuit and the signal ground of signal processing circuit can not altogether, the power supply of Hall element and letter below
The power supply of number process circuit must take the mode of independent power supply, the DC-DC power source of such as isolation, and this will increase circuit
Complexity and cost.Further, since the forward voltage drop of two diodes of full-bridge rectifier, same detection resistance, closed loop is suddenly
The maximum linear detection current range of your current sensor will reduce.
Content of the invention
The purpose of the present invention is that provides a kind of peak value for full-bridge switch converter to solve the above problems
Current sample and its signal processing circuit.
The present invention is achieved through the following technical solutions above-mentioned purpose：
A kind of peak point current sampling for full-bridge switch converter and its signal processing circuit, including closed loop Hall current
Sensor and its power supply, absolute value circuit, waveform shaping circuit, described absolute value circuit includes current rectifier and electricity
Stream voltage conversion and waveform summing circuit, the signal output part of described closed-loop Hall current sensor and described current rectifier
Signal input part connect, the signal output part of described current rectifier and the conversion of described Current Voltage and waveform summing circuit
Signal input part connect, the signal output part of the conversion of described Current Voltage and waveform summing circuit and described waveform shaping electricity
The signal input part on road connects, and the signal output part of described waveform shaping circuit processes the signal input part of protection circuit with PWM
Connect, the first side winding of the main transformer of described full-bridge switch converter passes through the former limit of described closed-loop Hall current sensor
Electric current is bored a hole.
Specifically, the positive voltage input of described closed-loop Hall current sensor is connected with the positive pole of the first power supply, described
The negative voltage input of closed-loop Hall current sensor is connected with the negative pole of second source, the negative pole of described first power supply with described
The positive pole connection of second source is followed by signal ground.
Closed-loop Hall current sensor can regard electron type zero-flux current transformer as, can have direct current with direct detection
The high frequency ac signal of component, therefore can overcome the magnetic-reset problem of current transformer.
Specifically, described absolute value circuit includes first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th electricity
Resistance, the 6th resistance, the first diode, the second diode, the 3rd diode, the 4th diode, the first triode, the second triode
With the first operational amplifier, the signal output part negative pole with described first diode respectively of described closed-loop Hall current sensor
Connect with the positive pole of described second diode, the positive pole of described first diode is anti-phase with described first operational amplifier respectively
The first end of input and described second resistance connects, the negative pole of described second diode respectively with described first operational amplifier
In-phase input end and described first resistor first end connect, described first resistor second end ground connection, described first computing
The signal output part of amplifier is connected with the negative pole of described 3rd diode and the positive pole of described 4th diode respectively, and described
The positive pole of three diodes is connected with the first end of described 3rd resistor and the base stage of described first triode respectively, described 3rd electricity
Hinder the second end be connected with the colelctor electrode of described first triode and the cathode voltage end of described first operational amplifier respectively and connect+
15V voltage, the negative pole of described 4th diode respectively with the first end of described 4th resistance and the base stage of described second triode
Connect, the second end of described 4th resistance is negative with the colelctor electrode of described second triode and described first operational amplifier respectively
Pole tension input connects and connects -15V voltage, and the emitter stage of described first triode is connected with the first end of described 5th resistance
Connect, the emitter stage of described second triode is connected with the first end of described 6th resistance, the second end of described 5th resistance is respectively
It is connected with described second end of the 6th resistance and the second end of described second resistance, the second end of described 5th resistance is described exhausted
Signal output part to value circuit.
Specifically, described waveform shaping circuit includes the 7th resistance, electric capacity and the second operational amplifier, described 7th resistance
First end be connected with the signal output part of described absolute value circuit, the second end of described 7th resistance respectively with described electric capacity
The in-phase input end of first end and described second operational amplifier connects, the second end ground connection of described electric capacity, described second computing
The inverting input of amplifier is connected with the output end of described second operational amplifier, the positive pole electricity of described second operational amplifier
Pressure input and cathode voltage input connect+15V and -15V voltage respectively.
The beneficial effects of the present invention is：
The present invention is used for peak point current sampling and its signal transacting of full-bridge switch converter, is embodied in peak point current sampling
The advantage of aspect：
(1) eliminate the shadow to peak-current mode control loop stability for the detection error due to ordinary electric current mutual-inductor
Ring, eliminate the big small echo phenomenon that switch converters output current is likely to occur therefrom, reduce the output current of switch converters
Ripple.
(2) reduce ordinary electric current mutual-inductor due to magnetic bias and saturation it is impossible to correct sensed current signal, thus can not carry out
The effectively problem of peak value comparison method.Overcurrent protection for current impulse one by one, it is possible to reduce the mistake protection thus causing
Occur.
The advantage being embodied in signal transacting aspect：
(1) solve during most voltage mode absolute value circuits are not applied at present from technology and cost, big work(
The process problem of rate full-bridge switch converter switches pipe transient current sampled signal, can complete the tens of KHz of frequency, peak-to-peak very well
The accurate signed magnitude arithmetic(al) of the quasi-retangular wave electric current of value number uA～tens of mA.
(2) current sampling circuit and signal processing circuit can altogether, insulating power supply that need not be relatively costly and complicated.Phase
For prior art (3), reduce by two switching diodes, decrease the maximum linear detection electric current of closed-loop Hall current sensor
The decline of scope.
(3) circuit is simple, low cost.
Brief description
Fig. 1 is the sampling of the peak point current for full-bridge switch converter of the present invention and its structural frames of signal transacting
Figure；
Fig. 2 is the circuit diagram of the sampling of the peak point current for full-bridge switch converter of the present invention and its signal transacting；
Fig. 3 is the circuit diagram of full-bridge switch converter of the present invention；
Fig. 4 is a kind of circuit diagram of exemplary voltages pattern absolute value circuit；
Fig. 5 is the simulation waveform comparison diagram of the absolute value circuit part in the circuit of Fig. 4 and the circuit of Fig. 2.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings：
As shown in figure 1, the present invention is used for peak point current sampling and its signal processing circuit of full-bridge switch converter, including
Closed-loop Hall current sensor and its power supply, absolute value circuit, waveform shaping circuit, absolute value circuit includes current rectification
Device and Current Voltage conversion and waveform summing circuit, the signal output part of closed-loop Hall current sensor and current rectifier
Signal input part connects, the signal input of the signal output part of current rectifier and Current Voltage conversion and waveform summing circuit
End connects, and the signal output part of Current Voltage conversion and waveform summing circuit is with the signal input part of waveform shaping circuit even
Connect, the signal input part that the signal output part of waveform shaping circuit processes protection circuit with PWM is connected, full-bridge switch converter
The first side winding of main transformer passes through the primary current perforation of closed-loop Hall current sensor, closed-loop Hall current sensor
Positive voltage input is connected with the positive pole of the first power supply.
As shown in Fig. 2 the negative voltage input of closed-loop Hall current sensor is connected with the negative pole of second source, the first electricity
The negative pole in source is connected with the positive pole of second source and is followed by signal ground, absolute value circuit include first resistor R1, second resistance R2,
Three resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the first diode D1, the second diode D2, the three or two pole
Pipe D3, the 4th diode D4, the first triode Q1, the second triode Q2 and the first operational amplifier U1-1, closed loop Hall current
The signal output part of sensor H is connected with the negative pole of the first diode D1 and the positive pole of the second diode D2 respectively, the one or two pole
The positive pole of pipe D1 is connected with the inverting input of the first operational amplifier U1-1 and the first end of second resistance R2 respectively, and the two or two
The negative pole of pole pipe D2 is connected with the in-phase input end of the first operational amplifier U1-1 and the first end of first resistor R1 respectively, and first
The second end ground connection of resistance R1, the signal output part of the first operational amplifier U1-1 respectively with the negative pole of the 3rd diode D3 and the
The positive pole of four diode D4 connects, positive pole first end and the first triode Q1 with 3rd resistor R3 respectively of the 3rd diode D3
Base stage connect, 3rd resistor R3 second end is respectively with the colelctor electrode of the first triode Q1 and the first operational amplifier U1-1 just
Pole tension end connects and connects+15V voltage, negative pole first end and second triode with the 4th resistance R4 respectively of the 4th diode
The base stage of Q2 connects, the second end colelctor electrode and first operational amplifier U1-1 with the second triode Q2 respectively of the 4th resistance R4
Cathode voltage input connect simultaneously -15V voltage, the emitter stage of the first triode Q1 is connected with the first end of the 5th resistance R5,
The emitter stage of the second triode Q2 is connected with the first end of the 6th resistance R6, second end of the 5th resistance R5 respectively with the 6th resistance
Second end of second end of R6 and second resistance R2 connects, and second end of the 5th resistance R5 is the signal output of absolute value circuit
End, waveform shaping circuit includes the 7th resistance R7, electric capacity C and the second operational amplifier U1-2, the first end of the 7th resistance R7 with
The signal output part of absolute value circuit connects, and second end of the 7th resistance R7 is put with the first end of electric capacity C and the second computing respectively
The in-phase input end of big device U1-2 connects, the second end ground connection of electric capacity C, the inverting input of the second operational amplifier U1-2 and the
The output end of two operational amplifier U1-2 connects, and the cathode voltage input of the second operational amplifier U1-2 and cathode voltage input
End connects+15V and -15V voltage respectively.
The present invention is as follows for the peak point current sampling of full-bridge switch converter and its operation principle of signal processing circuit：
For overcoming shortcoming and the deficiency of prior art (1), during for operation of current transformers, need exciting current, and excitation
There is a problem of of electric current makes current transformer produce measure error, employs closed-loop Hall current sensor detection peak value electricity
Stream.Closed-loop Hall current sensor can regard electron type zero-flux current transformer as, in the case of steady-state current, this mutual
Magnetic flux in sensor magnetic core is zero or magnetic flux is close to zero.By providing additional electromotive force to the current transformer being compensated,
To reach the purpose reducing exciting current.Especially closed-loop Hall current sensor can have the high frequency of DC component with direct detection
AC signal, can overcome the magnetic-reset problem of current transformer.
For overcoming shortcoming and the deficiency of prior art (2), employ current rectifier, directly utilize closed loop Hall current to pass
The electric current output of sensor, realizes rectification in current field, then becomes voltage output through I-V circuit transformations.
For overcome the shortcoming of prior art (3) with not enough, employ halfwave rectifier, and with integrated first operational amplifier
I-V conversion and waveform summing circuit that U1-1 is constituted, are solved current sampling circuit and can not be asked altogether with signal processing circuit
Topic.
The selection of closed-loop Hall current sensor according to concrete application, will need to consider the switching frequency of switch converters, main
The dynamic range of transformer first side winding electric current Ip peak-to-peak value, isolation voltage, response time etc..In the present embodiment, select
The closed-loop Hall current sensor (model LA 100-P) of LEM company, it has insulation high pressure (2.5kV), measurement accurately (essence
Within degree ± 0.7%), dynamic property good (current tracking speed is more than 200A/ μ s, and the response time is less than 1 μ s), signal band width
The advantages of (DC 200kHz).
First operational amplifier U1-1 need to be from the Voltage Feedback of extremely low input bias current and high voltage gain integrated the
One operational amplifier U1-1.In the present embodiment, operational amplifier (model OPA2134) from TI company, have that as little as 5pA's is defeated
Enter bias current, and extremely low current noise, be therefore well suited for making I-V conversion amplifier.
The resistance of wherein first resistor R1 and second resistance R2 is equal, and it is all the precision resistance needing coupling, resistance
Size is determined jointly by the dynamic range being sampled current signal and selected closed-loop Hall current sensor.
3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 3rd diode D3, the 4th diode
D4, the first triode Q1 and the second triode Q26 constitute symmetrical level of penetrating and follow output buffer amplifier, in the negative half-wave of Iout
During arrival, provide the high current beyond amplifier current output capability for anti-phase output type I-V translation circuit.Wherein 3rd resistor
R3, the 4th resistance R4, the 3rd diode D3 and the 4th diode D4 constitute the biasing circuit of output buffer amplifier, are the one or three
Pole pipe Q1 and the second triode Q2 provide quiescent current, reduce signal intermodulation distortion.5th resistance R5 and the 6th resistance R6 introduces
Current Negative Three-Point Capacitance, makes output-stage circuit more stable.
The first-order low-pass ripple that waveform shaping circuit is made up of the 7th resistance R7, electric capacity C and the second operational amplifier U1-2
Device is constituted, primarily to reducing the spike interference in sample rate current waveform forward position, prevents the PWM ratio in follow-up PWM process circuit
Compared with device misoperation, or the comparator misoperation of follow-up current foldback circuit.
In the circuit diagram (Fig. 3) of full-bridge switch converter, A point and B point draw wire, stream for main transformer first side winding
Through the main transformer primary side high-frequency pulse current Ip for full-bridge switch converter between A-B point, and the main transformer pressure of this section A-B
Device first side winding passes through the primary current perforation of closed-loop Hall current sensor, makes closed-loop Hall current sensor according to once
To absolute value circuit, (wherein Iout=Ip × Kn, Kn are closed loop Hall to size output current Iout of side high-frequency pulse current Ip
The conversion ratio of current sensor)；The first diode D1 in absolute value circuit and the second diode D2 is whole respectively as positive half-wave
Stream device and negative half-wave rectifier, only play the effect of the sense of current of switching Iout, the non-linear not shadow of volt-ampere of characteristic diode
Ring size and the fidelity of electric current Iout.First operational amplifier U1-1, first resistor R1, second resistance R2 and output buffering are put
Big device constitutes I-V conversion and waveform summing circuit.When the positive half-wave of Iout arrives, the second diode D2 turns on the first diode D1
Cut-off, circuit structure switches to homophase output type I-V translation circuit, when the negative half-wave of Iout arrives, the first diode D1 conducting
Second diode D2 cut-off, circuit structure switches to anti-phase output type I-V translation circuit, it is achieved thereby that to transformer primary side
(Uout=| Ip × Kn × r |, wherein r are first resistor R1 for the signed magnitude arithmetic(al) of the sampling of high-frequency pulse current and high speed and precision
Resistance with second resistance R2).
Fig. 4 is a kind of schematic diagram of typical voltage mode absolute value circuit, typically through using two operational amplifiers, two
Individual diode and five precision resistances needing coupling；It is carried out wave simulation contrast, incoming wave with the circuit in this example
Shape be the typical peak-current mode of simulation control phase shifted full bridge ZVS converter be sampled current waveform, in output waveform
(as shown in Figure 5), solid line is the output waveform of the absolute value circuit that this example adopts, and dotted line is that a kind of representative prior art adopts
Voltage mode absolute value circuit output waveform it can be clearly seen that the signal of absolute value circuit in this example loses
Very, the more obvious distortion phenomenon of the signal generation of typical voltage mode absolute value circuit.
Technical scheme is not limited to the restriction of above-mentioned specific embodiment, and every technology according to the present invention scheme is done
The technology deformation going out, each falls within protection scope of the present invention.
Claims (2)
1. a kind of for full-bridge switch converter peak point current sampling and its signal processing circuit it is characterised in that：Including closing
Ring Hall current sensor and its power supply, absolute value circuit, waveform shaping circuit, it is whole that described absolute value circuit includes electric current
Stream device and Current Voltage conversion and waveform summing circuit, the signal output part of described closed-loop Hall current sensor and described electricity
The signal input part of flow rectifier connects, and the signal output part of described current rectifier is changed and waveform with described Current Voltage
The signal input part connection of summing circuit, the signal output part of described Current Voltage conversion and waveform summing circuit and described ripple
The signal input part of shape shaping circuit connects, and the signal output part of described waveform shaping circuit processes the letter of protection circuit with PWM
Number input connects, and the first side winding of the main transformer of described full-bridge switch converter passes through described closed loop Hall current sensing
The primary current perforation of device, the positive voltage input of described closed-loop Hall current sensor is connected with the positive pole of the first power supply, institute
The negative voltage input stating closed-loop Hall current sensor is connected with the negative pole of second source, the negative pole of described first power supply and institute
The positive pole connection stating second source is followed by signal ground；
Described absolute value circuit include first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance,
First diode, the second diode, the 3rd diode, the 4th diode, the first triode, the second triode and the first computing are put
Big device, the signal output part negative pole and the described 2nd 2 with described first diode respectively of described closed-loop Hall current sensor
The positive pole of pole pipe connects, the positive pole of described first diode respectively with the inverting input of described first operational amplifier and described
The first end of second resistance connects, the negative pole in-phase input end with described first operational amplifier respectively of described second diode
Connect with the first end of described first resistor, the second end ground connection of described first resistor, the signal of described first operational amplifier
Output end is connected with the negative pole of described 3rd diode and the positive pole of described 4th diode respectively, and described 3rd diode is just
Pole is connected with the first end of described 3rd resistor and the base stage of described first triode respectively, and described 3rd resistor second end is respectively
It is connected and connects+15V voltage with the colelctor electrode of described first triode and the cathode voltage end of described first operational amplifier, described
The negative pole of the 4th diode is connected with the first end of described 4th resistance and the base stage of described second triode respectively, and the described 4th
Second end of resistance respectively with the colelctor electrode of described second triode and the cathode voltage input of described first operational amplifier
Connect and connect -15V voltage, the emitter stage of described first triode is connected with the first end of described 5th resistance, the described 2nd 3
The emitter stage of pole pipe is connected with the first end of described 6th resistance, the second end of described 5th resistance respectively with described 6th resistance
The second end and described second resistance second end connect, the second end of described 5th resistance is the signal of described absolute value circuit
Output end.
2. the peak point current sampling for full-bridge switch converter according to claim 1 and its signal processing circuit, its
It is characterised by：Described waveform shaping circuit includes the 7th resistance, electric capacity and the second operational amplifier, and the first of described 7th resistance
End is connected with the signal output part of described absolute value circuit, the second end first end with described electric capacity respectively of described 7th resistance
Connect with the in-phase input end of described second operational amplifier, the second end ground connection of described electric capacity, described second operational amplifier
Inverting input be connected with the output end of described second operational amplifier, the input of the cathode voltage of described second operational amplifier
End and cathode voltage input connect+15V and -15V voltage respectively.
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| TWI811997B (en) * | 2022-02-08 | 2023-08-11 | 國立中興大學 | Variable DC power supply device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108362927B (en) * | 2018-03-14 | 2024-05-07 | 广东海明晖电子科技有限公司 | Active low-frequency current signal detection and control circuit |
| CN112803775B (en) * | 2020-12-31 | 2022-06-21 | 国创移动能源创新中心(江苏)有限公司 | Detection and suppression method and system for direct current component of transformer current |
| CN113295989B (en) * | 2021-06-07 | 2023-06-16 | 苏州市运泰利自动化设备有限公司 | Half-bridge circuit performance test system and method |
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