CN104242659A - 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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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, particularly relate to the sampling of a kind of peak current for full-bridge switch converter and signal processing circuit thereof.
Background technology
Full-bridge switch converter as in, the preferred version of high power D C-DC converter, apply very extensive.The control strategy of full-bridge switch converter mainly comprises peak-current mode and controls and voltage mode control, the former needs the transient current of sampling switch pipe and participates in PWM directly to control, and also can participate in overcurrent protection, short-circuit protection or transformer bias and magnetically saturated protection simultaneously; The circuit that the latter needs the transient current of sense switch pipe to protect for overcurrent protection, short-circuit protection, transformer bias and magnetic saturation.Sensor sample to current signal be high frequency ac signal; after the absolute value circuit having to pass through high speed and precision and waveform shaping circuit process; the control procedure of the pulse current one by one of peak-current mode PWM pulse width modulator could be participated in as effective transient current signal, and the overcurrent protection of pulse current or the protection of dynamic magnetic bias one by one.Therefore in full-bridge switch converter, peak current sampling and signal processing circuit extremely important.Present stage, for the sampling of the high-frequency pulse current of full-bridge switch converter main transformer primary side and signal transacting, is generally following three kinds of modes:
(1) electric current is detected by the current transformer being connected on full-bridge circuit main transformer side; the full-bridge rectifier rectification that the sample rate current exported forms through diode; finally on resistance, convert current signal to voltage signal, participate in PWM and control or switching tube overcurrent short-circuit protection.There is larger ratio difference and angular difference value in common current transformer, this error is caused by exciting current in measuring process.Exciting current is the electric current that magnetic device is set up magnetic field and consumed, and can not be converted into output voltage signal, but can introduce error to the measurement of electric current.This error may affect the stability of control loop in peak-current mode controls, and cause the output current of DC-DC converter to occur the large small echo of similar subharmonic oscillation, output current ripple enlarges markedly.Secondly, recommending, in the bipolarity converter such as full-bridge, in theory, main transformer primary side flows through the bipolar current pulse of Symmetrical, does not have DC component, and current transformer is magnetic core energy normal reset when current impulse each zero passage.But due to the difference of device property, magnetic bias more or less always exists, and the change of the external factor such as change and temperature rise along with load, the hunting range of magnetic linkage also has drifts about slowly.If the magnetic core of current transformer can not reset, magnetic core will be caused saturated gradually.CT saturation is a very serious problem, is first the current value that correctly can not detect main transformer primary side, thus can not carries out effective Current Control; Secondly, may there is misoperation in overcurrent or short-circuit protection circuit.
(2) adopting closed-loop Hall current sensor to carry out current sample, then converting the current signal of output to voltage signal by detecting resistance.Signal transacting adopts the absolute value circuit of voltage mode.The absolute value circuit of voltage mode generally adopts operational amplifier and diode to realize active precision rectifying.Voltage-mode rectification is variable with voltage, processes in voltage domain to voltage signal, and its core devices is Voltage Feedback operational amplifier.Gain-the bandwidth product constant due to Voltage Feedback amplifier and lower slew rate, to the rectification of high frequency, small-signal, can produce serious error, even circuit all cannot normally work.Although employing broadband, the Voltage Feedback operational amplifier that slew rate is high can reduce the error of voltage mode absolute value circuit, the price of its costliness can make the cost of voltage mode absolute value circuit greatly increase.At present, the switching frequency of high-power full-bridge switch converter at 20KHz ~ 100KHz, current waveform is quasi-retangular wave, and dynamic range is large, can the cost performance of the voltage mode absolute value circuit of works fine under these conditions extremely low.
(3) closed-loop Hall current sensor is adopted to carry out current sample, the full-bridge rectifier of fast recovery rectifier diode composition directly carries out rectification at Hall element signal output part, the current signal that rectification is good is added to and detects on resistance, just can obtain the absolute value voltage signal that rule is complete.But the input and output side of full bridge rectifier circuit can not have common port, therefore, the signal ground of current sampling circuit and the signal ground of signal processing circuit can not altogether, power supply and the power supply of signal processing circuit below of Hall element must take the mode of powering separately, the DC-DC power source of such as isolating, this will increase complexity and the cost of circuit.In addition, due to the forward voltage drop of full-bridge rectifier two diodes, same detection resistance, the maximum linear of closed-loop Hall current sensor detects current range and will reduce.
Summary of the invention
Object of the present invention is just to provide a kind of peak current for full-bridge switch converter to sample and signal processing circuit to solve the problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
A kind of sampling of the peak current for full-bridge switch converter and signal processing circuit thereof, comprise closed-loop Hall current sensor and power supply thereof, absolute value circuit, waveform shaping circuit, described absolute value circuit comprises current rectifier and electric current-voltage transitions and waveform summing circuit, the signal output part of described closed-loop Hall current sensor is connected with the signal input part of described current rectifier, the signal output part of described current rectifier is connected with the signal input part of described electric current-voltage transitions and waveform summing circuit, the signal output part of described electric current-voltage transitions and waveform summing circuit is connected with the signal input part of described waveform shaping circuit, the signal output part of described waveform shaping circuit is connected with the signal input part of PWM process protective circuit, the first side winding of the main transformer of described full-bridge switch converter is bored a hole through the primary current of described closed-loop Hall current sensor.
Particularly, the positive voltage input of described closed-loop Hall current sensor is connected with the positive pole of the first power supply, the negative voltage input of described closed-loop Hall current sensor is connected with the negative pole of second source, connects signal ground after the negative pole of described first power supply is connected with the positive pole of described second source.
Closed-loop Hall current sensor can regard electron type zero-flux current transformer as, can have the high frequency ac signal of DC component by direct-detection, therefore can overcome the magnetic-reset problem of current transformer.
Particularly, described absolute value circuit comprises the first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, 6th resistance, first diode, second diode, 3rd diode, 4th diode, first triode, second triode and the first operational amplifier, the signal output part of described closed-loop Hall current sensor is connected with the negative pole of described first diode and the positive pole of described second diode respectively, the positive pole of described first diode is connected with the inverting input of described first operational amplifier and the first end of described second resistance respectively, the negative pole of described second diode is connected with the in-phase input end of described first operational amplifier and the first end of described first resistance respectively, second end ground connection of described first resistance, the signal output part of described first operational amplifier is connected with the negative pole of described 3rd diode and the positive pole of described 4th diode respectively, the positive pole of described 3rd diode is connected with the first end of described 3rd resistance and the base stage of described first triode respectively, described 3rd resistance second end is connected with the collector electrode of described first triode and the cathode voltage end of described first operational amplifier and connects+15V voltage respectively, the negative pole of described 4th triode is connected with the first end of described 4th resistance and the base stage of described second triode respectively, second end of described 4th resistance is connected also-15V voltage with the collector electrode of described second triode and the cathode voltage input of described first operational amplifier respectively, the emitter of described first triode is connected with the first end of described 5th resistance, the emitter of described second triode is connected with the first end of described 6th resistance, second end of described 5th resistance is connected with the second end of described 6th resistance and the second end of described second resistance respectively, second end of described 5th resistance is the signal output part of described absolute value circuit.
Particularly, described waveform shaping circuit comprises the 7th resistance, electric capacity and the second operational amplifier, the first end of described 7th resistance is connected with the signal output part of described absolute value circuit, second end of described 7th resistance is connected with the first end of described electric capacity and the in-phase input end of described second operational amplifier respectively, second end ground connection of described electric capacity, the inverting input of described second operational amplifier is connected with the output of described second operational amplifier, the cathode voltage input of described second operational amplifier and cathode voltage input connect+15V and-15V voltage respectively.
Beneficial effect of the present invention is:
The present invention is used for peak current sampling and the signal transacting thereof of full-bridge switch converter, is embodied in the advantage of peak current sampling aspect:
(1) eliminate because the metrical error of ordinary electric current mutual-inductor is on the impact of peak-current mode control loop stability, eliminate the large small echo phenomenon that switch converters output current may occur therefrom, reduce the output current ripple of switch converters.
(2) ordinary electric current mutual-inductor is reduced due to magnetic bias and saturated, can not correct sensed current signal, thus the problem of effective peak value comparison method can not be carried out.For the overcurrent protection of current impulse one by one, the mistake protection caused thus can be reduced and occur.
Be embodied in the advantage of signal transacting aspect:
(1) from technology and cost solve current most voltage mode absolute value circuit can not be applicable in, the process problem of high-power full-bridge switch converter switches pipe transient current sampled signal, the accurate signed magnitude arithmetic(al) of quasi-retangular wave electric current of the tens of KHz of frequency, peak-to-peak value number uA ~ tens of mA can be completed very well.
(2) current sampling circuit and signal processing circuit can altogether, the higher and insulating power supply of complexity without the need to cost.Relative to prior art (3), reduce by two switching diodes, the maximum linear decreasing closed-loop Hall current sensor detects the decline of current range.
(3) circuit is simple, and cost is low.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the peak current for full-bridge switch converter of the present invention sampling and signal transacting thereof;
Fig. 2 is the circuit diagram of the peak current for full-bridge switch converter of the present invention sampling and signal transacting thereof;
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.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, the present invention is used for peak current sampling and the signal processing circuit thereof of full-bridge switch converter, comprise closed-loop Hall current sensor and power supply thereof, absolute value circuit, waveform shaping circuit, absolute value circuit comprises current rectifier and electric current-voltage transitions and waveform summing circuit, the signal output part of closed-loop Hall current sensor is connected with the signal input part of current rectifier, the signal output part of current rectifier is connected with the signal input part of electric current-voltage transitions and waveform summing circuit, the signal output part of electric current-voltage transitions and waveform summing circuit is connected with the signal input part of waveform shaping circuit, the signal output part of waveform shaping circuit is connected with the signal input part of PWM process protective circuit, the first side winding of the main transformer of full-bridge switch converter is bored a hole through the primary current of closed-loop Hall current sensor, the positive voltage input of closed-loop Hall current sensor is connected with the positive pole of the first power supply.
As shown in Figure 2, the negative voltage input of closed-loop Hall current sensor is connected with the negative pole of second source, the negative pole of the first power supply connects signal ground after being connected with the positive pole of second source, absolute value circuit comprises the first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, first diode D1, second diode D2, 3rd diode D3, 4th diode D4, first triode Q1, second triode Q2 and the first operational amplifier U1-1, the signal output part of closed-loop Hall current sensor H is connected with the negative pole of the first diode D1 and the positive pole of the second diode D2 respectively, the positive pole of the first diode D1 is connected with the inverting input of the first operational amplifier U1-1 and the first end of the second resistance R2 respectively, the negative pole of the second diode D2 is connected with the in-phase input end of the first operational amplifier U1-1 and the first end of the first resistance R1 respectively, the second end ground connection of the first resistance R1, the signal output part of the first operational amplifier U1-1 is connected with the negative pole of the 3rd diode D3 and the positive pole of the 4th diode D4 respectively, the positive pole of the 3rd diode D3 is connected with the first end of the 3rd resistance R3 and the base stage of the first triode Q1 respectively, 3rd resistance R3 second end is connected with the collector electrode of the first triode Q1 and the cathode voltage end of the first operational amplifier U1-1 and connects+15V voltage respectively, the negative pole of the 4th triode is connected with the first end of the 4th resistance R4 and the base stage of the second triode Q2 respectively, second end of the 4th resistance R4 is connected also-15V voltage with the collector electrode of the second triode Q2 and the cathode voltage input of the first operational amplifier U1-1 respectively, the emitter of the first triode Q1 is connected with the first end of the 5th resistance R5, the emitter of the second triode Q2 is connected with the first end of the 6th resistance R6, second end of the 5th resistance R5 is connected with second end of the 6th resistance R6 and second end of the second resistance R2 respectively, second end of the 5th resistance R5 is the signal output part of absolute value circuit, waveform shaping circuit comprises the 7th resistance R7, electric capacity C and the second operational amplifier U1-2, the first end of the 7th resistance R7 is connected with the signal output part of absolute value circuit, second end of the 7th resistance R7 is connected with the first end of electric capacity C and the in-phase input end of the second operational amplifier U1-2 respectively, the second end ground connection of electric capacity C, the inverting input of the second operational amplifier U1-2 is connected with the output of the second operational amplifier U1-2, the cathode voltage input of the second operational amplifier U1-2 and cathode voltage input connect+15V and-15V voltage respectively.
The present invention be used for the peak current sampling of full-bridge switch converter and the operation principle of signal processing circuit as follows:
For overcoming the shortcoming of prior art (1) with not enough, need exciting current for during operation of current transformers, and the existence of exciting current makes current transformer produce the problem of measure error, have employed closed-loop Hall current sensor detection peak electric current.Closed-loop Hall current sensor can regard electron type zero-flux current transformer as, in steady-state current situation, the magnetic flux in this transformer core be zero or magnetic flux close to zero.By being provided additional electromotive force by the current transformer compensated, to reach the object reducing exciting current.Especially closed-loop Hall current sensor can have the high frequency ac signal of DC component by direct-detection, can overcome the magnetic-reset problem of current transformer.
For overcoming the shortcoming of prior art (2) with not enough, have employed current rectifier, directly utilizing the electric current of closed-loop Hall current sensor to export, realize rectification at current field, then become voltage to export through I-V circuit transformations.
For the shortcoming overcoming prior art (3) is with not enough, have employed halfwave rectifier, and the I-V conversion formed with integrated first operational amplifier U1-1 and waveform summing circuit, solving current sampling circuit and signal processing circuit can not problem altogether.
The selection of closed-loop Hall current sensor according to embody rule, will need consider the switching frequency of switch converters, the dynamic range of main transformer first side winding electric current I p peak-to-peak value, isolation voltage, response time etc.In the present embodiment, select the closed-loop Hall current sensor (model LA100-P) of LEM company, it has dielectric voltage withstand high (2.5kV), measure accurately (within precision ± 0.7%), dynamic property is good, and (current tracking speed is greater than 200A/ μ s, response time is less than 1 μ s), the advantages such as signal band wide (DC200kHz).
First operational amplifier U1-1 need select the integrated first operational amplifier U1-1 of the Voltage Feedback of extremely low input bias current and high voltage gain.In the present embodiment, select the operational amplifier (model OPA2134) of TI company, have the input bias current being low to moderate 5pA, and extremely low current noise, be therefore well suited for being I-V and convert amplifier.
Wherein the resistance of the first resistance R1 and the second resistance R2 is equal, and it is all the precision resistances needing coupling, and resistance size is determined jointly by the dynamic range and selected closed-loop Hall current sensor being sampled current signal.
3rd resistance 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 form symmetrical level of penetrating and follow output buffer amplifier, when the negative half-wave of Iout arrives, for anti-phase output type I-V translation circuit provides the big current exceeding amplifier current output capability.Wherein the 3rd resistance R3, the 4th resistance R4, the 3rd diode D3 and the 4th diode D4 form the biasing circuit of output buffer amplifier, for the first triode Q1 and the second triode Q2 provides 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 low-pass first order filter that waveform shaping circuit is made up of the 7th resistance R7, electric capacity C and the second operational amplifier U1-2 is formed; mainly in order to reduce the spike interference in sample rate current waveform forward position; prevent the PWM comparator misoperation in follow-up PWM treatment circuit, 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 are main transformer first side winding extraction wire, flow through the main transformer primary side high-frequency pulse current Ip for full-bridge switch converter between A-B point, and the main transformer first side winding of this A-B section is bored a hole through the primary current of closed-loop Hall current sensor, make closed-loop Hall current sensor according to the size output current Iout of primary side high-frequency pulse current Ip to absolute value circuit, (wherein Iout=Ip × Kn, Kn are the transfer ratio of closed-loop Hall current sensor); The first diode D1 in absolute value circuit and the second diode D2, respectively as positive half wave rectifier and negative half-wave rectifier, only plays the effect of the sense of current switching Iout, non-linear size and the fidelity not affecting electric current I out of volt-ampere of characteristic diode.First operational amplifier U1-1, the first resistance R1, the second resistance R2 and output buffer amplifier form I-V conversion and waveform summing circuit.When the positive half wave of Iout arrives, second diode D2 conducting first diode D1 ends, circuit structure switches to homophase output type I-V translation circuit, when the negative half-wave of Iout arrives, first diode D1 conducting second diode D2 ends, circuit structure switches to anti-phase output type I-V translation circuit, thus the signed magnitude arithmetic(al) (Uout=|Ip × Kn × r|, wherein r is the resistance of the first resistance R1 and the second resistance R2) of the sampling achieved transformer primary side high-frequency pulse current and high speed and precision.
Fig. 4 is a kind of schematic diagram of typical voltage mode absolute value circuit, generally through adopting the precision resistance of two operational amplifiers, two diodes and five needs couplings; Circuit in itself and this example is carried out wave simulation contrast, input waveform 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, dotted line is the output waveform of the voltage mode absolute value circuit that a kind of typical prior art adopts, there is not distortion in the signal of the absolute value circuit that can obviously find out in this example, and the signal of typical voltage mode absolute value circuit produces comparatively significantly distortion phenomenon.
Technical scheme of the present invention is not limited to the restriction of above-mentioned specific embodiment, the technology distortion that every technical scheme according to the present invention is made, and all falls within protection scope of the present invention.
Claims (4)
1. the sampling of the peak current for full-bridge switch converter and signal processing circuit thereof, it is characterized in that: comprise closed-loop Hall current sensor and power supply thereof, absolute value circuit, waveform shaping circuit, described absolute value circuit comprises current rectifier and electric current-voltage transitions and waveform summing circuit, the signal output part of described closed-loop Hall current sensor is connected with the signal input part of described current rectifier, the signal output part of described current rectifier is connected with the signal input part of described electric current-voltage transitions and waveform summing circuit, the signal output part of described electric current-voltage transitions and waveform summing circuit is connected with the signal input part of described waveform shaping circuit, the signal output part of described waveform shaping circuit is connected with the signal input part of PWM process protective circuit, the first side winding of the main transformer of described full-bridge switch converter is bored a hole through the primary current of described closed-loop Hall current sensor.
2. the sampling of the peak current for full-bridge switch converter according to claim 1 and signal processing circuit thereof, it is characterized in that: the positive voltage input of described closed-loop Hall current sensor is connected with the positive pole of the first power supply, the negative voltage input of described closed-loop Hall current sensor is connected with the negative pole of second source, connects signal ground after the negative pole of described first power supply is connected with the positive pole of described second source.
3. the sampling of the peak current for full-bridge switch converter according to claim 1 and signal processing circuit thereof, it is characterized in that: described absolute value circuit comprises the first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, 6th resistance, first diode, second diode, 3rd diode, 4th diode, first triode, second triode and the first operational amplifier, the signal output part of described closed-loop Hall current sensor is connected with the negative pole of described first diode and the positive pole of described second diode respectively, the positive pole of described first diode is connected with the inverting input of described first operational amplifier and the first end of described second resistance respectively, the negative pole of described second diode is connected with the in-phase input end of described first operational amplifier and the first end of described first resistance respectively, second end ground connection of described first resistance, the signal output part of described first operational amplifier is connected with the negative pole of described 3rd diode and the positive pole of described 4th diode respectively, the positive pole of described 3rd diode is connected with the first end of described 3rd resistance and the base stage of described first triode respectively, described 3rd resistance second end is connected with the collector electrode of described first triode and the cathode voltage end of described first operational amplifier and connects+15V voltage respectively, the negative pole of described 4th triode is connected with the first end of described 4th resistance and the base stage of described second triode respectively, second end of described 4th resistance is connected also-15V voltage with the collector electrode of described second triode and the cathode voltage input of described first operational amplifier respectively, the emitter of described first triode is connected with the first end of described 5th resistance, the emitter of described second triode is connected with the first end of described 6th resistance, second end of described 5th resistance is connected with the second end of described 6th resistance and the second end of described second resistance respectively, second end of described 5th resistance is the signal output part of described absolute value circuit.
4. the sampling of the peak current for full-bridge switch converter according to claim 1 and signal processing circuit thereof, it is characterized in that: described waveform shaping circuit comprises the 7th resistance, electric capacity and the second operational amplifier, the first end of described 7th resistance is connected with the signal output part of described absolute value circuit, second end of described 7th resistance is connected with the first end of described electric capacity and the in-phase input end of described second operational amplifier respectively, second end ground connection of described electric capacity, the inverting input of described second operational amplifier is connected with the output of described second operational amplifier, the cathode voltage input of described second operational amplifier and cathode voltage input connect+15V and-15V voltage respectively.
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| CN108362927A (en) * | 2018-03-14 | 2018-08-03 | 广东海明晖电子科技有限公司 | Active low-frequency current signal Detection ＆ Controling circuit |
| CN112803775A (en) * | 2020-12-31 | 2021-05-14 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Method and system for detecting and inhibiting direct current component of transformer current |
| CN113295989A (en) * | 2021-06-07 | 2021-08-24 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
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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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