CN105790220A - Short-circuit protection circuit and method for half-bridge topology converter - Google Patents
Short-circuit protection circuit and method for half-bridge topology converter Download PDFInfo
- Publication number
- CN105790220A CN105790220A CN201410790375.2A CN201410790375A CN105790220A CN 105790220 A CN105790220 A CN 105790220A CN 201410790375 A CN201410790375 A CN 201410790375A CN 105790220 A CN105790220 A CN 105790220A
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- operational amplifier
- electric capacity
- outfan
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Amplifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a short-circuit protection circuit and method for a half-bridge topology converter. The circuit comprises a ripple voltage acquisition circuit, a rectifier and filter circuit, a first operational amplifier, a first resistor and a time control circuit, wherein an input end of the ripple voltage acquisition circuit is used for collecting a ripple voltage of the half-bridge converter and an output end is connected with a positive input end of the first operational amplifier through the rectifier and filter circuit; a reverse input end of the first operational amplifier is connected with a first reference voltage and an output end is connected with the input end of the time control circuit; and the time control circuit is used for controlling actuation time and recovery time of the short-circuit protection circuit for the half-bridge topology converter through adjusting device parameters. The circuit judges the working state of a half-bridge circuit and the working state of a capacitor through the ripple change rate of a half-bridge energy storage capacitor; loop current detection is carried out without an extra mutual inductor; the circuit is accurate and fast in reaction in a short circuit or an overload; and the capacitive load capacity of the half-bridge converter is not affected.
Description
Technical field
The present invention relates to short-circuit protection circuit technical field, in particular it relates to a kind of half-bridge topology changer short-circuit protection circuit and method.
Background technology
Development along with science and technology, power electronic equipment is day by day close with the relation of the work of people, life, and electronic equipment all be unable to do without reliable power supply, therefore direct-current switch power supply starts to play more and more important effect, and subsequently entering various electronics, electric equipment field, programme-controlled exchange, communication, electron detection device power supply, control device power supply (DPS) etc. have been widely used direct-current switch power supply all.Simultaneously along with many new and high technologies, the development of technology such as including high-frequency switching technology, soft switch technique, power factor correction technology, synchronous rectification, intellectualized technology, surface mounting technique, switch power technology is innovated constantly, and this provides development space widely for direct-current switch power supply.But owing in Switching Power Supply, control circuit is more complicated, the ability of transistor and integrated device tolerance electricity, thermal shock is poor, in use brings very big inconvenience to user.In order to protect the safety of Switching Power Supply self and load, according to the principle of direct-current switch power supply and feature, devise overtemperature protection, overcurrent protection, overvoltage protection and soft start protection circuit.Though Switching Power Supply defencive function belongs to the additional function of supply unit electrical performance demands; but when adverse circumstances and contingency; whether protection circuit improves and by predetermined set work; the safety and reliability of supply unit is most important, the short-circuit protection circuit of a kind of applicable half-bridge topology changer is proposed according to protection circuit requirement.
Half-bridge converter principle such as Fig. 1, VG1 and VG2 turn on alternately, and Q10, Q20 are solely subjected to the input voltage of half, and C20, C30 capacitance is equal, and when Q10 turns on, C30 charges, and C20 discharges.Contrary to Q20 turns on, C20 charges, and C30 discharges.
In the topology of Switching Power Supply, half-bridge converter has the advantage that one, transformator bidirectional excitation, and transless magnetic bias problem, magnetic core utilization rate is higher.Two, half bridge converter circuit has stronger anti-unbalance ability, it is possible to be effectively prevented transformator unidirectional magnetic bias in high frequency.Three, switching tube bears pressure drop and only has the half of input voltage, and owing to transformator peak voltage is by the anti-also diode clamp of switching tube, switching tube both end voltage is not over the half of input voltage, so the resistance to pressure request of switch tube is relatively low.So at several hectowatts---under the middle low power of-several kilowatts, half-bridge circuit application is quite extensive, so in half-bridge circuit design to improve short circuit, overload protecting circuit particularly important.
Half-bridge topology overload, short-circuit protection circuit; it is generally adopted the size of current transformer, the former limit of resistance sampling or secondary current; the control end carrying out turning off main control chip by comparator or amplifier processes; although rapidly but there is a lot of defect in this kind of circuit protection; the first, half-bridge peak current detection controls, and easily forms positive feedback in short circuit or overpower when occurring, and the half period causing electric current big is increasing; form the quick magnetic bias of transformator, such as LM5035 control chip.The second, easily there is Current limited Control not in time in voltage loop control type chip, it is impossible to the size of electric current in true reflection loop, such as TL494 control chip.3rd, current voltage mode control cake core such as SI9122 etc., this type of chip is without short-circuit protection function.
Summary of the invention
The present invention is to overcome half-bridge topology changer short-circuit protection circuit in prior art can not effectively protect the defect of half-bridge converter, according to an aspect of the present invention, it is proposed to a kind of half-bridge topology changer short-circuit protection circuit.
A kind of half-bridge topology changer short-circuit protection circuit that the embodiment of the present invention provides, including: ripple voltage Acquisition Circuit, current rectifying and wave filtering circuit, the first operational amplifier, the first resistance, time control circuit；The input of ripple voltage Acquisition Circuit is for gathering the ripple voltage of half-bridge converter, and outfan is connected by the positive input terminal of current rectifying and wave filtering circuit and the first operational amplifier；The anti-input of the first operational amplifier and the first reference voltage are connected, and outfan is connected with the input of time control circuit；One end of first resistance is connected with the anti-input of the first operational amplifier, and the outfan of the other end and the first operational amplifier is connected；Time control circuit is used for the movement time by adjusting means state modulator half-bridge topology changer short-circuit protection circuit and recovery time；The outfan of time control circuit is for being connected with the function port of external half-bridge convertor controls chip；And when the input of time control circuit is high level, outfan is low level, when the input of time control circuit is low level, outfan is high level.
In technique scheme, ripple voltage Acquisition Circuit includes the first electric capacity and the second resistance；First electric capacity one end is for gathering the ripple voltage of half-bridge converter, and the other end is by ground connection after the second resistance；And first connect the outfan that node is ripple voltage Acquisition Circuit between electric capacity and the second resistance.
In technique scheme, current rectifying and wave filtering circuit includes: diode, the second electric capacity and the 3rd resistance；The anode of diode is connected with the outfan of ripple voltage Acquisition Circuit, and negative electrode is connected by one end of the 3rd resistance and the second electric capacity, the other end ground connection of the second electric capacity；The positive input terminal connecting node and the first operational amplifier between second electric capacity and the 3rd resistance is connected.
In technique scheme, time control circuit includes: the first audion, the second audion, the second operational amplifier, the 3rd electric capacity, the 4th resistance, the 5th resistance and the 6th resistance；One end of 4th resistance is connected with the outfan of the first operational amplifier, and the colelctor electrode of the other end and the first audion is connected；The base stage of the first audion is connected with the base stage of the second audion, and is connected with the colelctor electrode of the first audion；The emitter stage of the first audion and the emitter stage of the second audion are connected and ground connection；One end of 5th resistance is connected with the second reference voltage, and one end of the other end and the 3rd electric capacity is connected, the other end ground connection of the 3rd electric capacity；The colelctor electrode connecting node and the second audion of the 5th resistance and the 3rd electric capacity is connected, and is connected with the positive input terminal of the second operational amplifier；The anti-input of the second operational amplifier and the 3rd reference voltage are connected, and one end of the 6th resistance is connected with the anti-input of the second operational amplifier, and the outfan of the other end and the second operational amplifier is connected；The outfan of the second operational amplifier is the outfan of time control circuit.
In technique scheme, the first audion and the second audion are NPN type triode；The emitter area of the first audion and the second audion is identical.
In above-mentioned technology, the second reference voltage is more than the 3rd reference voltage.
In technique scheme, time control circuit includes: the 3rd operational amplifier, the 4th electric capacity, the 7th resistance, the 8th resistance, the 9th resistance and the tenth resistance；One end of 7th resistance is connected with the outfan of the first operational amplifier, and one end of the other end and the 4th electric capacity is connected；One end of 4th electric capacity is also connected with one end of the 8th resistance, other end ground connection；The anti-input connecting node and the 3rd operational amplifier of the 8th resistance and the 4th electric capacity is connected, and the other end ground connection of the 8th resistance；One end of 9th resistance is connected with the positive input terminal of the 3rd operational amplifier, and the other end and the 4th reference voltage are connected, and one end of the tenth resistance is connected with the anti-input of the 3rd operational amplifier, and the outfan of the other end and the 3rd operational amplifier is connected；And the 3rd outfan that outfan is time control circuit of operational amplifier.
The present invention is to overcome half-bridge topology changer short-circuit protection circuit in prior art can not effectively protect the defect of half-bridge converter, according to an aspect of the present invention, it is proposed to a kind of half-bridge topology changer short-circuit protection method.
A kind of half-bridge topology changer short-circuit protection method that the embodiment of the present invention provides, including: the ripple voltage of half-bridge converter is gathered according to above-mentioned half-bridge topology changer short-circuit protection circuit；Ripple voltage is carried out rectification and Filtering Processing, obtains DC voltage component；DC voltage component and reference voltage are compared, when DC voltage component is more than reference voltage, it is determined that half-bridge topology changer short-circuit protection circuit output low level, controls the level state of the function port of half-bridge converter control chip；And pass through movement time and the recovery time of the state modulator half-bridge topology changer short-circuit protection circuit of device in regulating time control circuit.
In technique scheme; when the time control circuit of half-bridge topology changer short-circuit protection circuit is the above-mentioned time control circuit including the first audion, the second audion, the second operational amplifier, the 3rd electric capacity, the 4th resistance, the 5th resistance and the 6th resistance; by movement time of the state modulator half-bridge topology changer short-circuit protection circuit of device in regulating time control circuit and recovery time, including:
By regulating the first resistance and the 6th resistance controls the upset return difference of the first operational amplifier and the second operational amplifier respectively；
Control the size of current of mirror current source by regulating the 4th resistance, and control the discharge time of the 3rd electric capacity；The charging interval of the 3rd electric capacity is controlled by regulating the 5th resistance.
In technique scheme; when the time control circuit of half-bridge topology changer short-circuit protection circuit is the above-mentioned time control circuit including the 3rd operational amplifier, the 4th electric capacity, the 7th resistance, the 8th resistance, the 9th resistance and the tenth resistance; by movement time of the state modulator half-bridge topology changer short-circuit protection circuit of device in regulating time control circuit and recovery time, including:
The first operational amplifier and the upset return difference of the 3rd operational amplifier is controlled respectively by regulating the first resistance and the tenth resistance；The discharge time of the 4th electric capacity is controlled by regulating the 8th resistance.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from description, or understand by implementing the present invention.The purpose of the present invention and other advantages can be realized by structure specifically noted in the description write, claims and accompanying drawing and be obtained.
A kind of half-bridge topology changer short-circuit protection circuit of embodiment of the present invention offer and method, by the ripple rate of change of half-bridge storage capacitor, it is determined that the duty of half-bridge circuit and the duty of electric capacity, carry out protection act under there are overload or abnormal conditions.When this circuit is without additionally using transformer to carry out loop current detection, short circuit or overload, circuit reaction accurately, rapidly, and does not affect the capacitance load capability of half-bridge converter.When ensureing that main circuit increases this circuit and simply increases merely short-circuit protection function when not doing any change, main circuit is not had any impact, portable strong.Meanwhile, it is accurate, adjustable that the short-circuit protection of this circuit starts the time, to ensure the capacitance load capability of Switching Power Supply, and true reflection power work state, and the self-recoverage time is adjustable.When there is operation irregularity in half-bridge storage capacitor, can trigger protection in time when the fault such as excessive in ripple current, ESR value exception, the quick-fried slurry of electric capacity occurs, it is prevented that the excessive damage electric capacity of capacitor ripple current, affect power source life, power supply is played a protective role.Additionally, damage prevented also from power supply in the quick magnetic bias situation of transformator.
Below by drawings and Examples, technical scheme is described in further detail.
Accompanying drawing explanation
Accompanying drawing is for providing a further understanding of the present invention, and constitutes a part for description, is used for together with embodiments of the present invention explaining the present invention, is not intended that limitation of the present invention.In the accompanying drawings:
Fig. 1 is the circuit theory diagrams of half-bridge converter of the prior art；
Fig. 2 is the first circuit diagram of half-bridge topology changer short-circuit protection circuit in the embodiment of the present invention；
Fig. 3 is the second circuit figure of half-bridge topology changer short-circuit protection circuit in the embodiment of the present invention；
Fig. 4 is the circuit diagram of half-bridge topology changer short-circuit protection circuit in embodiment one；
Fig. 5 is the circuit diagram of half-bridge topology changer short-circuit protection circuit in embodiment one；
Fig. 6 is the flow chart of half-bridge topology changer short-circuit protection method in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, it is to be understood that protection scope of the present invention is not by the restriction of detailed description of the invention.
According to embodiments of the present invention; provide a kind of half-bridge topology changer short-circuit protection circuit; Fig. 2 is the structure chart of this circuit, including: ripple voltage Acquisition Circuit 10, current rectifying and wave filtering circuit the 20, first operational amplifier IC1A, the first resistance R1, time control circuit 30.
Concrete, the input of ripple voltage Acquisition Circuit 10 is for gathering the ripple voltage of half-bridge converter, and this input specifically can be connected (i.e. the connection node of C20 and C30 in Fig. 1) with the connection node of half-bridge converter storage capacitor.The outfan of ripple voltage Acquisition Circuit 10 is connected with the positive input terminal of the first operational amplifier IC1A by current rectifying and wave filtering circuit 20；The anti-input of the first operational amplifier IC1A and the first reference voltage V ref1 are connected, and outfan is connected with the input of time control circuit 30.
One end of first resistance R1 is connected with the anti-input of the first operational amplifier IC1A, and the outfan of the other end and the first operational amplifier IC1A is connected.This first resistance R1 is return difference resistance, for controlling the upset return difference of the first operational amplifier IC1A.
Time control circuit 30 is used for the movement time by adjusting means state modulator half-bridge topology changer short-circuit protection circuit and recovery time；The outfan of time control circuit 30 is for being connected with the function port of external half-bridge convertor controls chip；This function end mouth specifically includes Enable Pin, the gentle start end of remote control end etc. and function port Low level effective.When the input of time control circuit 30 is high level, outfan is low level, and when the input of time control circuit 30 is low level, outfan is high level.
Owing to the switching tube (VG1 and the VG2 in Fig. 1) of half-bridge converter makes storage capacitor (C20 and the C30 in Fig. 1) there is certain alternating current component, it is correspondingly formed exchange ripple voltage, when occurring electric current excessive or short-circuit, the ripple voltage that storage capacitor C20 and C30 connecting joint are pointed out can sharply increase, and namely can determine whether whether half-bridge converter existed the problems such as stream by monitoring the situation of this ripple voltage.
Concrete; the specific works process of the half-bridge topology changer short-circuit protection circuit that the embodiment of the present invention provides is as follows: after ripple voltage Acquisition Circuit gathers ripple voltage; by current rectifying and wave filtering circuit, this ripple voltage carried out rectification process and Filtering Processing; obtain the DC component of ripple voltage, and compare with the first reference voltage V ref1.When half-bridge converter normal operation, the anti-input terminal voltage of the first operational amplifier is more than positive input terminal voltage；When the problem such as half-bridge converter generation electric current is excessive or short-circuit, ripple voltage becomes big, the anti-input terminal voltage of the first operational amplifier is less than positive input terminal voltage, the outfan upset of the first operational amplifier, output high level, and then time control circuit output low level, by the level state of the function port of external half-bridge convertor controls chip down for low level, thus half-bridge converter quits work.
A kind of half-bridge topology changer short-circuit protection circuit that the embodiment of the present invention provides, by the ripple rate of change of half-bridge storage capacitor, it is determined that the duty of half-bridge circuit and the duty of electric capacity, carries out protection act under there are overload or abnormal conditions.When this circuit does not additionally use transformer to carry out loop current detection, short circuit or overload, circuit reaction accurately, rapidly, and does not affect the capacitance load capability of half-bridge converter.When ensureing that main circuit increases this circuit and simply increases merely short-circuit protection function when not doing any change, main circuit is not had any impact, portable strong.Meanwhile, it is accurate, adjustable that the short-circuit protection of this circuit starts the time, to ensure the capacitance load capability of Switching Power Supply, and true reflection power work state, and the self-recoverage time is adjustable.When there is operation irregularity in half-bridge storage capacitor, can trigger protection in time when the fault such as excessive in ripple current, ESR value exception, the quick-fried slurry of electric capacity occurs, it is prevented that the excessive damage electric capacity of capacitor ripple current, affect power source life, power supply is played a protective role.Additionally, damage prevented also from power supply in the quick magnetic bias situation of transformator.
Preferably, shown in Figure 3, ripple voltage Acquisition Circuit 10 includes: the first electric capacity C1 and the second resistance R2.Wherein, first electric capacity C1 one end, for gathering the ripple voltage of half-bridge converter, specifically can be connected with the connection node of half-bridge converter storage capacitor, and the other end of the first electric capacity C1 is by ground connection after the second resistance R2；And first connect the outfan that node is ripple voltage Acquisition Circuit 10 between electric capacity C1 and the second resistance R2.
Preferably, shown in Figure 3, current rectifying and wave filtering circuit 20 includes: diode D1, the second electric capacity C2 and the three resistance R3；The anode of diode D1 is connected with the outfan of ripple voltage Acquisition Circuit 10, and negative electrode is connected by one end of the 3rd resistance R3 and the second electric capacity C2, the other end ground connection of the second electric capacity C2；The positive input terminal connecting node and the first operational amplifier IC1A between second electric capacity C2 and the 3rd resistance R3 is connected.
Wherein, diode D1 is for carrying out rectification process to ripple voltage, and the second electric capacity C2 and the three resistance R3 is for being filtered the ripple voltage after rectification processing.
The structure of this half-bridge topology changer short-circuit protection circuit is discussed in detail below by two embodiments.
Embodiment one
Shown in Figure 4, in embodiment one, time control circuit 30 includes: the first audion Q1, the second audion Q2, the second operational amplifier IC1B, the 3rd electric capacity C3, the 4th resistance R4, the 5th resistance R5 and the six resistance R6.
Concrete, one end of the 4th resistance R4 is connected with the outfan of the first operational amplifier IC1A, and the colelctor electrode of the other end and the first audion Q1 is connected.The base stage of the first audion Q1 is connected with the base stage of the second audion Q2, and is connected with the colelctor electrode of the first audion Q1；The emitter stage of the first audion Q1 and the emitter stage of the second audion Q2 are connected and ground connection.
One end of 5th resistance R5 is connected with the second reference voltage V ref2, and one end of the other end and the 3rd electric capacity C3 is connected, the other end ground connection of the 3rd electric capacity C3；The colelctor electrode connecting node and the second audion Q2 of the 5th resistance R5 and the three electric capacity C3 is connected, and is connected with the positive input terminal of the second operational amplifier IC1B.
The anti-input of the second operational amplifier IC1B and the 3rd reference voltage V ref3 are connected, and one end of the 6th resistance R6 is connected with the anti-input of the second operational amplifier IC1B, and the outfan of the other end and the second operational amplifier IC1B is connected；The outfan of the second operational amplifier IC1B is the outfan of time control circuit 30.
Wherein, the first audion Q1 and the second audion Q2 is NPN type triode；And first the emitter area of audion Q1 and the second audion Q2 identical.First audion Q1, the second audion Q2 and the four resistance R4 form current mirror, and owing to the emitter area of the first audion Q1 and the second audion Q2 is identical, the electric current flowing through the first audion Q1 and the second audion Q2 is also identical.Meanwhile, the magnitude of voltage of the second reference voltage V ref2 magnitude of voltage more than the 3rd reference voltage V ref3.
In embodiment one, the work process of this circuit is specific as follows: when half-bridge converter normal operation, the outfan output low level of the first operational amplifier, and current mirror does not work, and the second reference voltage V ref2 is the 3rd electric capacity charging；The positive input terminal voltage of the second operational amplifier, more than anti-input terminal voltage, exports high level.When problems such as half-bridge converter generation electric current are excessive or short-circuit, ripple voltage becomes big, the outfan upset of the first operational amplifier, exports high level；The magnitude of voltage assuming this high level is Vre, then flow through the first audion Q1 and flow through the electric current of the second audion Q2 and be (Vre-0.7)/R4(R4It is the resistance of the 4th resistance R4), thus the second audion Q2 discharges with this electric current for the 3rd electric capacity C3, when the magnitude of voltage of the 3rd electric capacity C3 is lower than three reference voltages, the outfan upset of the second operational amplifier, output low level, thus by the level state of the function port of external half-bridge convertor controls chip down for low level, half-bridge converter quits work.
When half-bridge converter recovers normal operation, the second reference voltage V ref2 is the 3rd electric capacity C3 charging, and the 5th resistance controls the charging interval of the 3rd electric capacity；When the magnitude of voltage of the 3rd electric capacity is more than three reference voltages, the positive input terminal voltage of the second operational amplifier is more than anti-input terminal voltage, the second operational amplifier output high level.
Embodiment two
Shown in Figure 5, in embodiment two, time control circuit 30 includes: the 3rd operational amplifier IC2B, the 4th electric capacity C4, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9 and the ten resistance R10.
Concrete, one end of the 7th resistance R7 is connected with the outfan of the first operational amplifier IC1A, and one end of the other end and the 4th electric capacity C4 is connected；One end of 4th electric capacity C4 is also connected with one end of the 8th resistance R8, other end ground connection.
The anti-input connecting node and the 3rd operational amplifier IC2B of the 8th resistance R8 and the four electric capacity C4 is connected, and the other end ground connection of the 8th resistance R8.
One end of 9th resistance R9 is connected with the positive input terminal of the 3rd operational amplifier IC2B, and the other end and the 4th reference voltage V ref4 are connected.
One end of tenth resistance R10 is connected with the anti-input of the 3rd operational amplifier IC2B, and the outfan of the other end and the 3rd operational amplifier IC2B is connected；And the 3rd outfan that outfan is time control circuit 30 of operational amplifier IC2B.
In embodiment two, in embodiment one, the work process of this circuit is specific as follows: when half-bridge converter normal operation, the outfan output low level of the first operational amplifier, the positive input terminal voltage of the 3rd operational amplifier, more than anti-input terminal voltage, exports high level.When the problem such as half-bridge converter generation electric current is excessive or short-circuit, ripple voltage becomes big, the outfan upset of the first operational amplifier, output high level, is the 4th electric capacity C4 charging, when the magnitude of voltage of the 4th electric capacity is higher than four reference voltages simultaneously, the outfan upset of the 3rd operational amplifier, output low level, thus by the level state of the function port of external half-bridge convertor controls chip down for low level, half-bridge converter quits work.
When half-bridge converter recovers normal operation, the 4th electric capacity C4 is discharged by the 8th resistance；When the magnitude of voltage of the 4th electric capacity is less than four reference voltages, the positive input terminal voltage of the second operational amplifier is more than anti-input terminal voltage, the second operational amplifier output high level.
Describing the 26S Proteasome Structure and Function of this half-bridge topology changer short-circuit protection circuit in detail above, the embodiment of the present invention also provides for the guard method of a kind of half-bridge converter short circuit, and the method is specific as follows.
A kind of half-bridge topology changer short-circuit protection method shown in Figure 6, that the embodiment of the present invention provides, including:
Step 601: gather the ripple voltage of half-bridge converter according to above-mentioned half-bridge topology changer short-circuit protection circuit.
Step 602: ripple voltage carries out rectification and Filtering Processing, obtains DC voltage component.
Step 603: DC voltage component and reference voltage are compared, when DC voltage component is more than reference voltage, it is determined that half-bridge topology changer short-circuit protection circuit output low level, controls the level state of the function port of half-bridge converter control chip；And pass through movement time and the recovery time of the state modulator half-bridge topology changer short-circuit protection circuit of device in regulating time control circuit.
Concrete; when half-bridge topology changer short-circuit protection circuit is the half-bridge topology changer short-circuit protection circuit in above-described embodiment one; by movement time of the state modulator half-bridge topology changer short-circuit protection circuit of device in regulating time control circuit and recovery time, specifically include:
By regulating the first resistance and the 6th resistance controls the upset return difference of the first operational amplifier and the second operational amplifier respectively；Control the size of current of mirror current source by regulating the 4th resistance, and control the discharge time of the 3rd electric capacity；The charging interval of the 3rd electric capacity is controlled by regulating the 5th resistance.
Preferably; when the half-bridge topology changer short-circuit protection circuit provided during half-bridge topology changer short-circuit protection circuit is for above-described embodiment two; by movement time of the state modulator half-bridge topology changer short-circuit protection circuit of device in regulating time control circuit and recovery time, specifically include:
The first operational amplifier and the upset return difference of the 3rd operational amplifier is controlled respectively by regulating the first resistance and the tenth resistance；The discharge time of the 4th electric capacity is controlled by regulating the 8th resistance.
A kind of half-bridge topology changer short-circuit protection circuit of embodiment of the present invention offer and method, by the ripple rate of change of half-bridge storage capacitor, it is determined that the duty of half-bridge circuit and the duty of electric capacity, carry out protection act under there are overload or abnormal conditions.When this circuit is without additionally using transformer to carry out loop current detection, short circuit or overload, circuit reaction accurately, rapidly, and does not affect the capacitance load capability of half-bridge converter.When ensureing that main circuit increases this circuit and simply increases merely short-circuit protection function when not doing any change, main circuit is not had any impact, portable strong.Meanwhile, it is accurate, adjustable that the short-circuit protection of this circuit starts the time, to ensure the capacitance load capability of Switching Power Supply, and true reflection power work state, and the self-recoverage time is adjustable.When there is operation irregularity in half-bridge storage capacitor, can trigger protection in time when the fault such as excessive in ripple current, ESR value exception, the quick-fried slurry of electric capacity occurs, it is prevented that the excessive damage electric capacity of capacitor ripple current, affect power source life, power supply is played a protective role.Additionally, damage prevented also from power supply in the quick magnetic bias situation of transformator.
The present invention can have multiple multi-form detailed description of the invention; above for Fig. 2-Fig. 6 in conjunction with accompanying drawing to technical scheme explanation for example; this is not meant to the instantiation that the present invention applies and can only be confined in specific flow process or example structure; those of ordinary skill in the art it is understood that; specific embodiments presented above is some examples in multiple its preferred usage, and the embodiment of any embodiment the claims in the present invention all should within technical solution of the present invention scope required for protection.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, it is not limited to the present invention, although the present invention being described in detail with reference to previous embodiment, for a person skilled in the art, technical scheme described in foregoing embodiments still can be modified by it, or wherein portion of techniques feature carries out equivalent replacement.All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (10)
1. a half-bridge topology changer short-circuit protection circuit, it is characterised in that including: ripple voltage Acquisition Circuit, current rectifying and wave filtering circuit, the first operational amplifier, the first resistance, time control circuit；
The input of described ripple voltage Acquisition Circuit is for gathering the ripple voltage of half-bridge converter, and outfan is connected with the positive input terminal of described first operational amplifier by described current rectifying and wave filtering circuit；The anti-input of described first operational amplifier and the first reference voltage are connected, and outfan is connected with the input of described time control circuit；One end of described first resistance is connected with the anti-input of described first operational amplifier, and the other end is connected with the outfan of described first operational amplifier；
Described time control circuit is used for the movement time by half-bridge topology changer short-circuit protection circuit described in adjusting means state modulator and recovery time；The outfan of described time control circuit is for being connected with the function port of external half-bridge convertor controls chip；And when the input of described time control circuit is high level, outfan is low level, when the input of described time control circuit is low level, outfan is high level.
2. circuit according to claim 1, it is characterised in that described ripple voltage Acquisition Circuit includes the first electric capacity and the second resistance；
Described first electric capacity one end is for gathering the ripple voltage of half-bridge converter, and the other end is by ground connection after described second resistance；And the outfan that connection node is described ripple voltage Acquisition Circuit between described first electric capacity and described second resistance.
3. circuit according to claim 1, it is characterised in that described current rectifying and wave filtering circuit includes: diode, the second electric capacity and the 3rd resistance；
The anode of described diode is connected with the outfan of described ripple voltage Acquisition Circuit, and negative electrode is connected with one end of described second electric capacity by described 3rd resistance, the other end ground connection of described second electric capacity；
The node that connects between described second electric capacity and the 3rd resistance is connected with the positive input terminal of described first operational amplifier.
4. according to the arbitrary described circuit of claim 1-3, it is characterised in that described time control circuit includes: the first audion, the second audion, the second operational amplifier, the 3rd electric capacity, the 4th resistance, the 5th resistance and the 6th resistance；
One end of described 4th resistance is connected with the outfan of described first operational amplifier, and the other end is connected with the colelctor electrode of described first audion；
The base stage of described first audion is connected with the base stage of described second audion, and is connected with the colelctor electrode of described first audion；The emitter stage of described first audion is connected with the emitter stage of described second audion and ground connection；
One end of described 5th resistance is connected with the second reference voltage, and the other end is connected with one end of described 3rd electric capacity, the other end ground connection of described 3rd electric capacity；Described 5th resistance is connected with the colelctor electrode of described second audion with the node that connects of described 3rd electric capacity, and is connected with the positive input terminal of described second operational amplifier；
The anti-input of described second operational amplifier and the 3rd reference voltage are connected, and one end of described 6th resistance is connected with the anti-input of described second operational amplifier, and the other end is connected with the outfan of described second operational amplifier；The outfan that outfan is described time control circuit of described second operational amplifier.
5. circuit according to claim 4, it is characterised in that described first audion and the second audion are NPN type triode；
Described first audion is identical with the emitter area of described second audion.
6. circuit according to claim 4, it is characterised in that described second reference voltage is more than described 3rd reference voltage.
7. according to the arbitrary described circuit of claim 1-3, it is characterised in that described time control circuit includes: the 3rd operational amplifier, the 4th electric capacity, the 7th resistance, the 8th resistance, the 9th resistance and the tenth resistance；
One end of described 7th resistance is connected with the outfan of described first operational amplifier, and the other end is connected with one end of described 4th electric capacity；One end of described 4th electric capacity is also connected with one end of described 8th resistance, other end ground connection；
Described 8th resistance is connected with the anti-input of described 3rd operational amplifier with the node that connects of described 4th electric capacity, and the other end ground connection of described 8th resistance；
One end of described 9th resistance is connected with the positive input terminal of described 3rd operational amplifier, and the other end and the 4th reference voltage are connected,
One end of described tenth resistance is connected with the anti-input of described 3rd operational amplifier, and the other end is connected with the outfan of described 3rd operational amplifier；And the outfan that outfan is described time control circuit of described 3rd operational amplifier.
8. a half-bridge topology changer short-circuit protection method, it is characterised in that including: gather the ripple voltage of half-bridge converter according to the arbitrary described half-bridge topology changer short-circuit protection circuit of claim 1-7；
Described ripple voltage is carried out rectification and Filtering Processing, obtains DC voltage component；
Described DC voltage component and reference voltage are compared, when described DC voltage component is more than reference voltage, it is determined that described half-bridge topology changer short-circuit protection circuit output low level, controls the level state of the function port of half-bridge converter control chip；And pass through movement time and the recovery time of half-bridge topology changer short-circuit protection circuit described in the state modulator of device in regulating time control circuit.
9. method according to claim 8; it is characterized in that; when described half-bridge topology changer short-circuit protection circuit is the arbitrary described half-bridge topology changer short-circuit protection circuit of claim 4-6; the described movement time by half-bridge topology changer short-circuit protection circuit described in the state modulator of device in regulating time control circuit and recovery time, including:
By regulating the first resistance and the 6th resistance controls the upset return difference of the first operational amplifier and the second operational amplifier respectively；
Control the size of current of mirror current source by regulating the 4th resistance, and control the discharge time of the 3rd electric capacity；The charging interval of the 3rd electric capacity is controlled by regulating the 5th resistance.
10. method according to claim 8; it is characterized in that; when the half-bridge topology changer short-circuit protection circuit that described half-bridge topology changer short-circuit protection circuit is described in claim 7; the described movement time by half-bridge topology changer short-circuit protection circuit described in the state modulator of device in regulating time control circuit and recovery time, including:
The first operational amplifier and the upset return difference of the 3rd operational amplifier is controlled respectively by regulating the first resistance and the tenth resistance；
The discharge time of described 4th electric capacity is controlled by regulating the 8th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410790375.2A CN105790220B (en) | 2014-12-17 | 2014-12-17 | A kind of half-bridge topology converter short-circuit protection circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410790375.2A CN105790220B (en) | 2014-12-17 | 2014-12-17 | A kind of half-bridge topology converter short-circuit protection circuit and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105790220A true CN105790220A (en) | 2016-07-20 |
| CN105790220B CN105790220B (en) | 2018-10-23 |
Family
ID=56374965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410790375.2A Active CN105790220B (en) | 2014-12-17 | 2014-12-17 | A kind of half-bridge topology converter short-circuit protection circuit and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105790220B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108429239A (en) * | 2018-04-24 | 2018-08-21 | 广州金升阳科技有限公司 | A kind of output overvoltage protection circuit and the power supply comprising the circuit |
| CN115051323A (en) * | 2022-08-17 | 2022-09-13 | 杭州飞仕得科技有限公司 | Bridge arm short-circuit protection circuit of power converter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1474490A (en) * | 2002-08-08 | 2004-02-11 | 深圳市中兴通讯股份有限公司 | Monostable comparator device |
| CN101039076A (en) * | 2007-04-28 | 2007-09-19 | 电子科技大学 | Voltage-stabilizing switch power source with voltage ripple detection circuit |
| US20080180162A1 (en) * | 2007-01-30 | 2008-07-31 | Jui-Yu Chang | Fast Turn On And Off Speed in PLL Cascoded Charge Pump |
| RU2490777C1 (en) * | 2012-04-03 | 2013-08-20 | Владимир Яковлевич Грошев | Direct current converter |
| CN203553907U (en) * | 2013-10-29 | 2014-04-16 | 郑州创亿达照明有限公司 | Input voltage ripple protection circuit |
| CN103944140A (en) * | 2014-03-05 | 2014-07-23 | 重庆四联光电科技有限公司 | Alternating current input over-voltage protection circuit |
-
2014
- 2014-12-17 CN CN201410790375.2A patent/CN105790220B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1474490A (en) * | 2002-08-08 | 2004-02-11 | 深圳市中兴通讯股份有限公司 | Monostable comparator device |
| US20080180162A1 (en) * | 2007-01-30 | 2008-07-31 | Jui-Yu Chang | Fast Turn On And Off Speed in PLL Cascoded Charge Pump |
| CN101039076A (en) * | 2007-04-28 | 2007-09-19 | 电子科技大学 | Voltage-stabilizing switch power source with voltage ripple detection circuit |
| RU2490777C1 (en) * | 2012-04-03 | 2013-08-20 | Владимир Яковлевич Грошев | Direct current converter |
| CN203553907U (en) * | 2013-10-29 | 2014-04-16 | 郑州创亿达照明有限公司 | Input voltage ripple protection circuit |
| CN103944140A (en) * | 2014-03-05 | 2014-07-23 | 重庆四联光电科技有限公司 | Alternating current input over-voltage protection circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108429239A (en) * | 2018-04-24 | 2018-08-21 | 广州金升阳科技有限公司 | A kind of output overvoltage protection circuit and the power supply comprising the circuit |
| CN115051323A (en) * | 2022-08-17 | 2022-09-13 | 杭州飞仕得科技有限公司 | Bridge arm short-circuit protection circuit of power converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105790220B (en) | 2018-10-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI491153B (en) | Discharge circuit and converter | |
| CN103607009B (en) | A kind of charge-discharge circuit with automatic protection functions | |
| CN203026904U (en) | Over-current protection circuit and PFC (power factor correction) control circuit with same | |
| CN101316047B (en) | Emergency power supply with charger | |
| CN111509825A (en) | 45W broadband voltage self-adaptation PPS super portable power source structure that fills soon | |
| CN106992684A (en) | Flyback power supply system and its control method | |
| CN104092271A (en) | Intelligent lithium battery charger | |
| CN209169943U (en) | Circuit of synchronous rectification, synchronous rectification protective device and charger | |
| CN205544520U (en) | Automatic energy -conserving charging circuit of pressure regulating | |
| CN105790220A (en) | Short-circuit protection circuit and method for half-bridge topology converter | |
| CN103904621A (en) | Current-limiting protection and short-circuit protection circuit with self-recovery function | |
| CN104953863A (en) | Switching power circuit for power supply of three-phase electric energy meter | |
| CN105337513A (en) | power conversion device and over-power protection method thereof | |
| CN203707751U (en) | RCC overvoltage protection circuit | |
| CN203180773U (en) | Passive intelligent power distribution apparatus | |
| CN115603552A (en) | Flyback switching power supply AC-DC conversion circuit | |
| CN212784852U (en) | Battery management system for base station standby power supply | |
| CN211351695U (en) | Output overcurrent protection circuit of high accuracy secondary control | |
| CN114825899A (en) | Totem pole power factor correcting circuit | |
| CN104467388B (en) | Power supply based on the conduction type harmonics restraint of PFC | |
| CN105958607A (en) | Charging device used for electrically driving coach car storage cell set | |
| CN107425741B (en) | AC-DC conversion circuit with low-voltage protection | |
| CN218276475U (en) | Miniature DC high-voltage converter | |
| CN221328647U (en) | Transformer module, charging circuit and charger | |
| CN215263737U (en) | Wireless charging secondary side approach detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |