CN105790220B - A kind of half-bridge topology converter short-circuit protection circuit and method - Google Patents
A kind of half-bridge topology converter short-circuit protection circuit and method Download PDFInfo
- Publication number
- CN105790220B CN105790220B CN201410790375.2A CN201410790375A CN105790220B CN 105790220 B CN105790220 B CN 105790220B CN 201410790375 A CN201410790375 A CN 201410790375A CN 105790220 B CN105790220 B CN 105790220B
- Authority
- CN
- China
- Prior art keywords
- circuit
- capacitance
- bridge
- operational amplifier
- resistance
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000011084 recovery Methods 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 230000005611 electricity Effects 0.000 claims description 12
- 238000007600 charging Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 abstract description 13
- 230000008859 change Effects 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 description 8
- 230000002159 abnormal effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Dc-Dc Converters (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of half-bridge topology converter short-circuit protection circuit and methods, wherein the circuit includes：Ripple voltage Acquisition Circuit, current rectifying and wave filtering circuit, the first operational amplifier, first resistor, time control circuit；The input terminal of ripple voltage Acquisition Circuit is used to acquire the ripple voltage of half-bridge converter, and output end is connected by current rectifying and wave filtering circuit with the positive input terminal of the first operational amplifier；The anti-input terminal of first operational amplifier is connected with the first reference voltage, and output end is connected with the input terminal of time control circuit；Time control circuit is used for actuation time and recovery time by adjusting means state modulator half-bridge topology converter short-circuit protection circuit.The ripple change rate that the circuit passes through half-bridge storage capacitor, the working condition for judging the working condition and capacitance of half-bridge circuit, when without additionally carrying out loop current detection, short circuit or overload using mutual inductor, circuit reaction is accurate, rapid, and does not influence the capacitance load capability of half-bridge converter.
Description
Technical field
The present invention relates to short-circuit protection circuit technical fields, and in particular, to a kind of half-bridge topology converter short-circuit protection
Circuit and method.
Background technology
With the development of science and technology, the relationship of the work, life of power electronic equipment and people is increasingly close, and electronics
Equipment all be unable to do without reliable power supply, therefore direct-current switch power supply starts to play increasingly important role, and subsequently enters
Various electronics, electrical equipment field, programme-controlled exchange, communication, electron detection device power supply, control device power supply etc. are all extensively
Ground has used direct-current switch power supply.Simultaneously with many new and high technologies, including high-frequency switching technology, soft switch technique, power because
The development of the technologies such as number alignment technique, synchronous rectification, intellectualized technology, surface mounting technique, switch power technology is not
It innovates disconnectedly, this provides extensive development space for direct-current switch power supply.But due in Switching Power Supply control circuit compare
Complexity, transistor and integrated device tolerance electricity, the ability of thermal shock are poor, bring very big inconvenience to user in use.
In order to protect the safety of Switching Power Supply itself and load, according to the principle and feature of direct-current switch power supply, devises overheat and protect
Shield, overcurrent protection, overvoltage protection and soft start protect circuit.Though Switching Power Supply defencive function belongs to supply unit electrical resistance
The additional function that can be required, but under the conditions of adverse circumstances and contingency, whether protection circuit improves and presses predetermined set work
Make, it is most important to the safety and reliability of supply unit, a kind of suitable half-bridge topology knot is proposed according to protection circuit requirement
The short-circuit protection circuit of structure converter.
Half-bridge converter principle such as Fig. 1, VG1 and VG2 interaction conducting, Q10, Q20 are solely subjected to the input voltage of half, C20,
C30 capacitances are equal, when Q10 is connected, C30 chargings, and C20 electric discharges.On the contrary when Q20 is connected, C20 chargings, C30 electric discharges.
In the topology of Switching Power Supply, half-bridge converter has the following advantages：One, transformer bidirectional excitation, transless are inclined
Magnetic problem, magnetic core utilization rate are higher.Two, half bridge converter circuit has stronger anti-unbalance ability, can effectively prevent
The only unidirectional magnetic bias of transformer in high frequency.Three, switching tube bears the half that pressure drop only has input voltage, and due to transformer
Peak voltage is switched on and off the anti-simultaneously diode clamp of pipe, and switching tube both end voltage does not exceed the half of input voltage, so split
The resistance to pressure request for closing pipe is relatively low.So in several hectowatts --- under-several kilowatts of middle low power, half-bridge circuit application is quite extensive, institute
With in half-bridge circuit design improve short circuit, overload protecting circuit it is particularly important.
Half-bridge topology overload, short-circuit protection circuit, generally use current transformer, resistance sampling primary side or secondary current
Size, the control terminal that shutdown main control chip is carried out by comparing device or amplifier is handled, although the protection of such circuit is rapid
But there are many defects, first, the control of half-bridge peak current detection, it is easy to be formed when short circuit or overpower occur positive and negative
Feedback, the half period for causing electric current big is increasing, forms the quick magnetic bias of transformer, as LM5035 controls chip.The second, voltage
Loop control cake core is susceptible to Current limited Control not in time, can not really reflect the size of electric current in loop, as TL494 is controlled
Chip.Third, voltage mode control cake core such as SI9122 etc. at present, such chip is without short-circuit protection function.
Invention content
The present invention be in order to overcome in the prior art half-bridge topology converter short-circuit protection circuit be unable to effective protection half-bridge
The defect of converter proposes a kind of half-bridge topology converter short-circuit protection circuit according to an aspect of the present invention.
A kind of half-bridge topology converter short-circuit protection circuit provided in an embodiment of the present invention, including：Ripple voltage acquisition electricity
Road, current rectifying and wave filtering circuit, the first operational amplifier, first resistor, time control circuit；The input terminal of ripple voltage Acquisition Circuit
Ripple voltage for acquiring half-bridge converter, the positive input terminal that output end passes through current rectifying and wave filtering circuit and the first operational amplifier
It is connected；The anti-input terminal of first operational amplifier is connected with the first reference voltage, the input terminal of output end and time control circuit
It is connected；One end of first resistor is connected with the anti-input terminal of the first operational amplifier, and the other end is defeated with the first operational amplifier
Outlet is connected；Time control circuit is used for the action by adjusting means state modulator half-bridge topology converter short-circuit protection circuit
Time and recovery time；The output end of time control circuit is for the function port phase with external half-bridge convertor controls chip
Even；And when the input terminal of time control circuit is high level, output end is low level, when the input terminal of time control circuit is
When low level, output end is high level.
In the above-mentioned technical solutions, ripple voltage Acquisition Circuit includes the first capacitance and second resistance；First capacitance one end
Ripple voltage for acquiring half-bridge converter, the other end after second resistance by being grounded；And first capacitance and second resistance it
Between connecting node be ripple voltage Acquisition Circuit output end.
In the above-mentioned technical solutions, current rectifying and wave filtering circuit includes：Diode, the second capacitance and 3rd resistor；Diode
Anode is connected with the output end of ripple voltage Acquisition Circuit, and cathode is connected by 3rd resistor with one end of the second capacitance, and second
The other end of capacitance is grounded；The positive input terminal phase of connecting node and the first operational amplifier between second capacitance and 3rd resistor
Even.
In the above-mentioned technical solutions, time control circuit includes：First triode, the second triode, the second operation amplifier
Device, third capacitance, the 4th resistance, the 5th resistance and the 6th resistance；The output of one end and the first operational amplifier of the 4th resistance
End is connected, and the other end is connected with the collector of the first triode；The base stage of first triode is connected with the base stage of the second triode,
And it is connected with the collector of the first triode；The emitter of the emitter of first triode and the second triode is connected and is grounded；
One end of 5th resistance is connected with the second reference voltage, and the other end is connected with one end of third capacitance, the other end of third capacitance
Ground connection；5th resistance is connected with the connecting node of third capacitance with the collector of the second triode, and and second operational amplifier
Positive input terminal be connected；The anti-input terminal of second operational amplifier is connected with third reference voltage, one end of the 6th resistance and the
The anti-input terminal of two operational amplifiers is connected, and the other end is connected with the output end of second operational amplifier；Second operational amplifier
Output end be time control circuit output end.
In the above-mentioned technical solutions, the first triode and the second triode are NPN type triode；First triode and
The emitter area of two triodes is identical.
In above-mentioned technology, the second reference voltage is more than third reference voltage.
In the above-mentioned technical solutions, time control circuit includes：Third operational amplifier, the 4th capacitance, the 7th resistance,
Eight resistance, the 9th resistance and the tenth resistance；One end of 7th resistance is connected with the output end of the first operational amplifier, the other end with
One end of 4th capacitance is connected；One end of 4th capacitance is also connected with one end of the 8th resistance, other end ground connection；8th resistance and
The connecting node of 4th capacitance is connected with the anti-input terminal of third operational amplifier, and the other end ground connection of the 8th resistance；9th
One end of resistance is connected with the positive input terminal of third operational amplifier, and the other end is connected with the 4th reference voltage, the tenth resistance
One end is connected with the anti-input terminal of third operational amplifier, and the other end is connected with the output end of third operational amplifier；And third
The output end of operational amplifier is the output end of time control circuit.
The present invention be in order to overcome in the prior art half-bridge topology converter short-circuit protection circuit be unable to effective protection half-bridge
The defect of converter proposes a kind of half-bridge topology converter short-circuit protection method according to an aspect of the present invention.
A kind of half-bridge topology converter short-circuit protection method provided in an embodiment of the present invention, including：According to above-mentioned half-bridge
Topological transformation device short-circuit protection circuit acquires the ripple voltage of half-bridge converter；Rectification is carried out to ripple voltage and is filtered,
Obtain DC voltage component；DC voltage component is compared with reference voltage, when DC voltage component is more than reference voltage
When, determine that half-bridge topology converter short-circuit protection circuit exports low level, the function port of control half-bridge converter control chip
Level state；And pass through the state modulator half-bridge topology converter short-circuit protection circuit of device in regulating time control circuit
Actuation time and recovery time.
In the above-mentioned technical solutions, include when the time control circuit of half-bridge topology converter short-circuit protection circuit is above-mentioned
First triode, the second triode, second operational amplifier, third capacitance, the 4th resistance, the 5th resistance and the 6th resistance when
Between control circuit when, pass through the state modulator half-bridge topology converter short-circuit protection circuit of device in regulating time control circuit
Actuation time and recovery time, including：
Turning over for the first operational amplifier and second operational amplifier is controlled respectively by adjusting first resistor and the 6th resistance
Go back to difference；
The size of current of mirror current source is controlled by adjusting the 4th resistance, and controls the discharge time of third capacitance；It is logical
Overregulate the charging time of the 5th resistance control third capacitance.
In the above-mentioned technical solutions, include when the time control circuit of half-bridge topology converter short-circuit protection circuit is above-mentioned
Third operational amplifier, the 4th capacitance, the 7th resistance, the 8th resistance, the 9th resistance and the tenth resistance time control circuit when,
By actuation time of the state modulator half-bridge topology converter short-circuit protection circuit of device in regulating time control circuit and extensive
The multiple time, including：
Turning over for the first operational amplifier and third operational amplifier is controlled respectively by adjusting first resistor and the tenth resistance
Go back to difference；The discharge time of the 4th capacitance is controlled by adjusting the 8th resistance.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The purpose of the present invention and other advantages can be by the explanations write
Specifically noted structure is realized and is obtained in book, claims and attached drawing.
A kind of half-bridge topology converter short-circuit protection circuit provided in an embodiment of the present invention and method pass through half-bridge energy storage electricity
The ripple change rate of appearance, judges the working condition of half-bridge circuit and the working condition of capacitance, is occurring overloading or abnormal conditions
Lower carry out protection act.When the circuit using mutual inductor without additionally carrying out loop current detection, short circuit or overload, circuit is anti-
Should be accurate, rapid, and the capacitance load capability of half-bridge converter is not influenced.Ensureing the case where main circuit does not do any change
Lower increase circuit is only simple to increase short-circuit protection function, does not have any influence to main circuit, portable strong.Meanwhile it should
The short-circuit protection startup time of circuit is accurate, adjustable, to ensure the capacitance load capability of Switching Power Supply, really reflects power work
State, and the self- recoverage time is adjustable.When there is operation irregularity in half-bridge storage capacitor, as ripple current is excessive, ESR values are abnormal,
Capacitance it is quick-fried slurry etc. failures occur when can timely trigger protection, prevent the excessive damage capacitance of capacitor ripple current, influence the power supply longevity
Life, plays a protective role to power supply.In addition, being damaged prevented also from power supply in the quick magnetic bias of transformer.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Description of the drawings
Attached drawing is used to provide further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the circuit diagram of half-bridge converter in the prior art；
Fig. 2 is the first circuit diagram of half-bridge topology converter short-circuit protection circuit in the embodiment of the present invention；
Fig. 3 is the second circuit figure of half-bridge topology converter short-circuit protection circuit in the embodiment of the present invention；
Fig. 4 is the circuit diagram of half-bridge topology converter short-circuit protection circuit in embodiment one；
Fig. 5 is the circuit diagram of half-bridge topology converter short-circuit protection circuit in embodiment one；
Fig. 6 is the flow chart of half-bridge topology converter short-circuit protection method in the embodiment of the present invention.
Specific implementation mode
Below in conjunction with the accompanying drawings, the specific implementation mode of the present invention is described in detail, it is to be understood that the guarantor of the present invention
Shield range is not restricted by specific implementation.
According to embodiments of the present invention, a kind of half-bridge topology converter short-circuit protection circuit is provided, Fig. 2 is the knot of the circuit
Composition, including：Ripple voltage Acquisition Circuit 10, current rectifying and wave filtering circuit 20, the first operational amplifier IC1A, first resistor R1, when
Between control circuit 30.
Specifically, the input terminal of ripple voltage Acquisition Circuit 10 is used to acquire the ripple voltage of half-bridge converter, the input
End can specifically be connected (i.e. the connecting node of C20 and C30 in Fig. 1) with the connecting node of half-bridge converter storage capacitor.Ripple
The output end of voltage collection circuit 10 is connected by current rectifying and wave filtering circuit 20 with the positive input terminal of the first operational amplifier IC1A；The
The anti-input terminal of one operational amplifier IC1A is connected with the first reference voltage V ref1, and output end is defeated with time control circuit 30
Enter end to be connected.
One end of first resistor R1 is connected with the anti-input terminal of the first operational amplifier IC1A, and the other end is put with the first operation
The output end of big device IC1A is connected.First resistor R1 is return difference resistance, the overturning for controlling the first operational amplifier IC1A
Return difference.
Time control circuit 30 is used for through the dynamic of adjusting means state modulator half-bridge topology converter short-circuit protection circuit
Make time and recovery time；The output end of time control circuit 30 is for the function port with external half-bridge convertor controls chip
It is connected；Start end etc. that the function port specifically includes Enable Pin, remote control end is eased up, and function port low level is effective.Work as the time
When the input terminal of control circuit 30 is high level, output end is low level, when the input terminal of time control circuit 30 is low level
When, output end is high level.
Since the switching tube (VG1 in Fig. 1 and VG2) of half-bridge converter is so that storage capacitor (C20 in Fig. 1 and C30)
There are certain alternating current components, are correspondingly formed exchange ripple voltage, when generation electric current is excessive or short-circuit, storage capacitor
The ripple voltage that C20 and C30 connecting nodes go out can sharply increase, and the situation by monitoring the ripple voltage can determine whether half-bridge
Converter whether there is the problems such as overcurrent.
Specifically, the specific work process of half-bridge topology converter short-circuit protection circuit provided in an embodiment of the present invention is such as
Under：Ripple voltage Acquisition Circuit acquire ripple voltage after, by current rectifying and wave filtering circuit to the ripple voltage carry out rectification processing and
It is filtered, obtains the DC component of ripple voltage, and be compared with the first reference voltage V ref1.When half-bridge converter just
Often when work, the anti-input terminal voltage of the first operational amplifier is more than positive input terminal voltage；When electric current mistake occurs for half-bridge converter
When the problems such as big or short-circuit, ripple voltage becomes larger, and the anti-input terminal voltage of the first operational amplifier is less than positive input terminal voltage,
The output end of first operational amplifier is overturn, and exports high level, and then time control circuit exports low level, and external half-bridge is become
Parallel operation controls the level state of the function port of chip down for low level, to which half-bridge converter is stopped.
A kind of half-bridge topology converter short-circuit protection circuit provided in an embodiment of the present invention, passes through the line of half-bridge storage capacitor
Wave change rate judges the working condition of half-bridge circuit and the working condition of capacitance, occur overloading or abnormal conditions under carry out
Protection act.When the circuit does not use additionally mutual inductor to carry out loop current detection, short circuit or overload, circuit reaction is accurate,
Rapidly, the capacitance load capability of half-bridge converter and is not influenced.Increase in the case where ensureing that main circuit does not do any change
The circuit is only simple to increase short-circuit protection function, does not have any influence to main circuit, portable strong.Meanwhile the circuit
The short-circuit protection startup time is accurate, adjustable, true to reflect power work state to ensure the capacitance load capability of Switching Power Supply,
And the self- recoverage time is adjustable.When operation irregularity occurs in half-bridge storage capacitor, as ripple current is excessive, ESR values are abnormal, capacitance is quick-fried
Slurry etc. failures occur when can timely trigger protection, prevent the excessive damage capacitance of capacitor ripple current, power source life influenced, to electricity
Source plays a protective role.In addition, being damaged prevented also from power supply in the quick magnetic bias of transformer.
Preferably, shown in Figure 3, ripple voltage Acquisition Circuit 10 includes：First capacitance C1 and second resistance R2.Its
In, first one end capacitance C1 is used to acquire the ripple voltage of half-bridge converter, specifically can be with half-bridge converter storage capacitor
Connecting node is connected, and the other end of the first capacitance C1 after second resistance R2 by being grounded；And first capacitance C1 and second resistance R2
Between connecting node be ripple voltage Acquisition Circuit 10 output end.
Preferably, shown in Figure 3, current rectifying and wave filtering circuit 20 includes：Diode D1, the second capacitance C2 and 3rd resistor
R3；The anode of diode D1 is connected with the output end of ripple voltage Acquisition Circuit 10, and cathode passes through the electricity of 3rd resistor R3 and second
The one end for holding C2 is connected, the other end ground connection of the second capacitance C2；Connecting node between second capacitance C2 and 3rd resistor R3 with
The positive input terminal of first operational amplifier IC1A is connected.
Wherein, diode D1 is used to carry out rectification processing to ripple voltage, the second capacitance C2 and 3rd resistor R3 for pair
Ripple voltage after rectification is filtered.
The structure of the half-bridge topology converter 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：First triode Q1, the second triode
Q2, second operational amplifier IC1B, third capacitance C3, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6.
Specifically, one end of the 4th resistance R4 is connected with the output end of the first operational amplifier IC1A, the other end and first
The collector of triode Q1 is connected.The base stage of first triode Q1 is connected with the base stage of the second triode Q2, and with the one or three pole
The collector of pipe Q1 is connected；The emitter of the emitter of first triode Q1 and the second triode Q2 are connected and are grounded.
One end of 5th resistance R5 is connected with the second reference voltage V ref2, and the other end is connected with one end of third capacitance C3,
The other end of third capacitance C3 is grounded；The collector of the connecting node and the second triode Q2 of 5th resistance R5 and third capacitance C3
It is connected, and is connected with the positive input terminal of second operational amplifier IC1B.
The anti-input terminal of second operational amplifier IC1B is connected with third reference voltage V ref3, one end of the 6th resistance R6
It is connected with the anti-input terminal of second operational amplifier IC1B, the other end is connected with the output end of second operational amplifier IC1B；The
The output end of two operational amplifier IC1B is the output end of time control circuit 30.
Wherein, the first triode Q1 and the second triode Q2 is NPN type triode；And the first triode Q1 and the two or three
The emitter area of pole pipe Q2 is identical.First triode Q1, the second triode Q2 and the 4th resistance R4 form current mirror, due to the
The emitter area of one triode Q1 and the second triode Q2 are identical, flow through the electric current of the first triode Q1 and the second triode Q2
Also identical.Meanwhile second reference voltage V ref2 voltage value be more than third reference voltage V ref3 voltage value.
In embodiment one, the course of work of the circuit is specific as follows：When half-bridge converter works normally, the first operation
The output end of amplifier exports low level, and current mirror does not work, and the second reference voltage V ref2 is third capacitor charging；Second fortune
The positive input terminal voltage for calculating amplifier is more than anti-input terminal voltage, exports high level.When half-bridge converter occur electric current it is excessive or
When the problems such as person is short-circuit, ripple voltage becomes larger, and the output end overturning of the first operational amplifier exports high level；Assuming that the height is electric
Flat voltage value is Vre, then it is (Vre-0.7)/R to flow through the first triode Q1 and flow through the electric current of the second triode Q24(R4
For the resistance value of the 4th resistance R4), to which the second triode Q2 discharges by third capacitance C3 of the electric current, when the electricity of third capacitance C3
When pressure value is less than third reference voltage, the output end overturning of second operational amplifier exports low level, to become external half-bridge
Parallel operation controls the level state of the function port of chip down for low level, and half-bridge converter is stopped.
When half-bridge converter restores to work normally, the second reference voltage V ref2 is the C3 chargings of third capacitance, the 5th resistance
Control the charging time of third capacitance；When the voltage value of third capacitance is more than third reference voltage, second operational amplifier
Positive input terminal voltage is more than anti-input terminal voltage, and second operational amplifier exports high level.
Embodiment two
Shown in Figure 5, in embodiment two, time control circuit 30 includes：Third operational amplifier IC2B, the 4th electricity
Hold C4, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9 and the tenth resistance R10.
Specifically, one end of the 7th resistance R7 is connected with the output end of the first operational amplifier IC1A, the other end and the 4th
One end of capacitance C4 is connected；One end of 4th capacitance C4 is also connected with one end of the 8th resistance R8, other end ground connection.
The connecting node of 8th resistance R8 and the 4th capacitance C4 is connected with the anti-input terminal of third operational amplifier IC2B, and
The other end of 8th resistance R8 is grounded.
One end of 9th resistance R9 is connected with the positive input terminal of third operational amplifier IC2B, the other end and the 4th benchmark electricity
Vref4 is pressed to be connected.
One end of tenth resistance R10 is connected with the anti-input terminal of third operational amplifier IC2B, the other end and third operation
The output end of amplifier IC2B is connected；And the output end that the output end of third operational amplifier IC2B is time control circuit 30.
In embodiment two, in embodiment one, the course of work of the circuit is specific as follows：When the normal work of half-bridge converter
When making, the output end of the first operational amplifier exports low level, and the positive input terminal voltage of third operational amplifier enters more than reverse pumping
Terminal voltage exports high level.When the problems such as electric current is excessive or short-circuit occurs for half-bridge converter, ripple voltage becomes larger, and first
The output end of operational amplifier is overturn, and high level is exported, while being the 4th capacitance C4 chargings, when the voltage value of the 4th capacitance is higher than
When four reference voltages, the output end of third operational amplifier is overturn, and exports low level, thus by external half-bridge convertor controls
Down for low level, half-bridge converter is stopped the level state of the function port of chip.
When half-bridge converter restores to work normally, the 4th capacitance C4 is discharged by the 8th resistance；When the 4th capacitance
Voltage value when being less than four reference voltages, the positive input terminal voltage of second operational amplifier is more than anti-input terminal voltage, second
Operational amplifier exports high level.
The structure and function of the half-bridge topology converter short-circuit protection circuit is described in detail above, and the embodiment of the present invention is also
A kind of guard method of half-bridge converter short circuit is provided, this method is specific as follows.
It is shown in Figure 6, a kind of half-bridge topology converter short-circuit protection method provided in an embodiment of the present invention, including：
Step 601：The ripple voltage of half-bridge converter is acquired according to above-mentioned half-bridge topology converter short-circuit protection circuit.
Step 602：Rectification is carried out to ripple voltage and is filtered, DC voltage component is obtained.
Step 603：DC voltage component is compared with reference voltage, when DC voltage component is more than reference voltage
When, determine that half-bridge topology converter short-circuit protection circuit exports low level, the function port of control half-bridge converter control chip
Level state；And pass through the state modulator half-bridge topology converter short-circuit protection circuit of device in regulating time control circuit
Actuation time and recovery time.
Specifically, when half-bridge topology converter short-circuit protection circuit is short for the half-bridge topology converter in above-described embodiment one
When circuit is protected on road, pass through the state modulator half-bridge topology converter short-circuit protection circuit of device in regulating time control circuit
It actuation time and recovery time, specifically includes：
Turning over for the first operational amplifier and second operational amplifier is controlled respectively by adjusting first resistor and the 6th resistance
Go back to difference；The size of current of mirror current source is controlled by adjusting the 4th resistance, and controls the discharge time of third capacitance；Pass through
Adjust the charging time of the 5th resistance control third capacitance.
Preferably, when half-bridge topology converter short-circuit protection circuit is the half-bridge topology transformation provided in above-described embodiment two
When device short-circuit protection circuit, pass through the state modulator half-bridge topology converter short-circuit protection electricity of device in regulating time control circuit
It the actuation time and recovery time on road, specifically includes：
Turning over for the first operational amplifier and third operational amplifier is controlled respectively by adjusting first resistor and the tenth resistance
Go back to difference；The discharge time of the 4th capacitance is controlled by adjusting the 8th resistance.
A kind of half-bridge topology converter short-circuit protection circuit provided in an embodiment of the present invention and method pass through half-bridge energy storage electricity
The ripple change rate of appearance, judges the working condition of half-bridge circuit and the working condition of capacitance, is occurring overloading or abnormal conditions
Lower carry out protection act.When the circuit using mutual inductor without additionally carrying out loop current detection, short circuit or overload, circuit is anti-
Should be accurate, rapid, and the capacitance load capability of half-bridge converter is not influenced.Ensureing the case where main circuit does not do any change
Lower increase circuit is only simple to increase short-circuit protection function, does not have any influence to main circuit, portable strong.Meanwhile it should
The short-circuit protection startup time of circuit is accurate, adjustable, to ensure the capacitance load capability of Switching Power Supply, really reflects power work
State, and the self- recoverage time is adjustable.When there is operation irregularity in half-bridge storage capacitor, as ripple current is excessive, ESR values are abnormal,
Capacitance it is quick-fried slurry etc. failures occur when can timely trigger protection, prevent the excessive damage capacitance of capacitor ripple current, influence the power supply longevity
Life, plays a protective role to power supply.In addition, being damaged prevented also from power supply in the quick magnetic bias of transformer.
It is of the invention can there are many various forms of specific implementation modes, above by taking Fig. 2-Fig. 6 as an example in conjunction with attached drawing to this hair
Bright technical solution gives an example, this is not meant to that the specific example that the present invention is applied can only be confined to specific flow
Or in example structure, those skilled in the art are it is to be appreciated that specific embodiment presented above is a variety of
Some examples in preferred usage, any embodiment for embodying the claims in the present invention should all be wanted in technical solution of the present invention
Within the scope of asking protection.
Finally it should be noted that：The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in the present invention's
Within protection domain.
Claims (7)
1. a kind of half-bridge topology converter short-circuit protection circuit, which is characterized in that including：Ripple voltage Acquisition Circuit, rectification filter
Wave circuit, the first operational amplifier, first resistor, time control circuit；
The input terminal of the ripple voltage Acquisition Circuit is used to acquire the ripple voltage of half-bridge converter, and output end passes through described whole
Stream filter circuit is connected with the positive input terminal of first operational amplifier；The anti-input terminal of first operational amplifier and
One reference voltage is connected, and output end is connected with the input terminal of the time control circuit；One end of the first resistor with it is described
The positive input terminal of first operational amplifier is connected, and the other end is connected with the output end of first operational amplifier；
The time control circuit is used for through half-bridge topology converter short-circuit protection circuit described in adjusting means state modulator
Actuation time and recovery time；The output end of the time control circuit is for the function with external half-bridge convertor controls chip
Port is connected；And when the input terminal of the time control circuit is high level, output end is low level, when the time control
When the input terminal of circuit is low level, output end is high level；
Wherein, the time control circuit includes：First triode, the second triode, second operational amplifier, third capacitance,
4th resistance, the 5th resistance and the 6th resistance；
One end of 4th resistance is connected with the output end of first operational amplifier, the other end and first triode
Collector be connected；
The base stage of first triode is connected with the base stage of second triode, and with the collector of first triode
It is connected；The emitter of first triode is connected and is grounded with the emitter of second triode；
One end of 5th resistance is connected with the second reference voltage, and the other end is connected with one end of the third capacitance, described
The other end of third capacitance is grounded；The collection of 5th resistance and the connecting node and second triode of the third capacitance
Electrode is connected, and is connected with the positive input terminal of the second operational amplifier；
The anti-input terminal of the second operational amplifier is connected with third reference voltage, one end of the 6th resistance and described the
The positive input terminal of two operational amplifiers is connected, and the other end is connected with the output end of the second operational amplifier；Second fortune
The output end for calculating amplifier is the output end of the time control circuit.
2. half-bridge topology converter short-circuit protection circuit according to claim 1, which is characterized in that the ripple voltage is adopted
Collector includes the first capacitance and second resistance；
First capacitance one end is used to acquire the ripple voltage of half-bridge converter, and the other end is followed by by the second resistance
Ground；And the output end that the connecting node between first capacitance and the second resistance is the ripple voltage Acquisition Circuit.
3. half-bridge topology converter short-circuit protection circuit according to claim 1, which is characterized in that the rectifying and wave-filtering electricity
Road includes：Diode, the second capacitance and 3rd resistor；
The anode of the diode is connected with the output end of the ripple voltage Acquisition Circuit, cathode by the 3rd resistor with
One end of second capacitance is connected, the other end ground connection of second capacitance；
Connecting node between second capacitance and 3rd resistor is connected with the positive input terminal of first operational amplifier.
4. half-bridge topology converter short-circuit protection circuit according to claim 1, which is characterized in that first triode
It is NPN type triode with the second triode；
First triode is identical with the emitter area of second triode.
5. half-bridge topology converter short-circuit protection circuit according to claim 1, which is characterized in that the second benchmark electricity
Pressure is more than the third reference voltage.
6. a kind of half-bridge topology converter short-circuit protection method, which is characterized in that including：It is any described according to claim 1-5
Half-bridge topology converter short-circuit protection circuit acquisition half-bridge converter ripple voltage；
Rectification is carried out to the ripple voltage and is filtered, DC voltage component is obtained；
The DC voltage component is compared with reference voltage, when the DC voltage component is more than reference voltage, really
The fixed half-bridge topology converter short-circuit protection circuit exports low level, the function port of control half-bridge converter control chip
Level state；And pass through half-bridge topology converter short-circuit protection circuit described in the state modulator of device in regulating time control circuit
Actuation time and recovery time.
7. according to the method described in claim 6, it is characterized in that, when the half-bridge topology converter short-circuit protection circuit is power
When profit requires 1-5 any described half-bridge topology converter short-circuit protection circuits, device in the control circuit by regulating time
The actuation time and recovery time of half-bridge topology converter short-circuit protection circuit described in the state modulator of part, including：
The overturning return difference of second operational amplifier is controlled by adjusting the 6th resistance；
The size of current of mirror current source is controlled by adjusting the 4th resistance, and controls the discharge time of third capacitance；Pass through tune
Save the charging time of the 5th resistance control third capacitance.
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 CN105790220A (en) | 2016-07-20 |
| CN105790220B true 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) |
Families Citing this family (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 (4)
| 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 |
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7514985B2 (en) * | 2007-01-30 | 2009-04-07 | Richwave Technology Corp. | 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 |
-
2014
- 2014-12-17 CN CN201410790375.2A patent/CN105790220B/en active Active
Patent Citations (4)
| 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105790220A (en) | 2016-07-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103236787B (en) | Capacity discharge method and circuit | |
| CN103151910B (en) | Undervoltage protection circuit, under-voltage protection method and switching power supply | |
| CN103152912B (en) | Modified high-efficiency light-emitting diode (LED) drive circuit and drive method | |
| TWI470916B (en) | Dc-dc converter and driving method thereof | |
| CN101316047B (en) | Emergency power supply with charger | |
| CN203026904U (en) | Over-current protection circuit and PFC (power factor correction) control circuit with same | |
| CN105790220B (en) | A kind of half-bridge topology converter short-circuit protection circuit and method | |
| CN206471805U (en) | A kind of POS printer overtemperature protection system | |
| CN209169943U (en) | Circuit of synchronous rectification, synchronous rectification protective device and charger | |
| CN203368003U (en) | Dual protection device for Boost circuit | |
| CN201307764Y (en) | Power supply circuit with overvoltage protection function | |
| CN109617197A (en) | Wireless power transmission circuit and its control method with failure protection function | |
| CN104953863A (en) | Switching power circuit for power supply of three-phase electric energy meter | |
| CN208046214U (en) | A kind of power supply module | |
| CN110881232A (en) | Flyback switching power supply circuit | |
| CN103715748A (en) | Lithium battery charging circuit | |
| CN215378425U (en) | Intelligent direct current power supply system | |
| CN211606083U (en) | Short-circuit protection circuit of IPM circuit, drive circuit and electronic equipment | |
| CN104467388B (en) | Power supply based on the conduction type harmonics restraint of PFC | |
| CN203691703U (en) | Device for controlling surge current of LED module | |
| KR101171739B1 (en) | A switch power source cycle by cycle overvoltage protection circuit | |
| CN103107702B (en) | A kind of electric power management circuit | |
| CN201234156Y (en) | Emergency power source having charger | |
| CN216312946U (en) | Circuit system for reducing startup surge current | |
| CN110972365A (en) | Silicon controlled rectifier circuit based on high-efficiency off-line LED dimming |
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 |