CN206364500U - Controlled resonant converter and its current foldback circuit - Google Patents
Controlled resonant converter and its current foldback circuit Download PDFInfo
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- CN206364500U CN206364500U CN201621284400.0U CN201621284400U CN206364500U CN 206364500 U CN206364500 U CN 206364500U CN 201621284400 U CN201621284400 U CN 201621284400U CN 206364500 U CN206364500 U CN 206364500U
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Abstract
The utility model is related to a kind of controlled resonant converter and its current foldback circuit.A kind of current foldback circuit, for being electrically connected with controlled resonant converter, to carry out overcurrent protection to controlled resonant converter；Including：Current converter circuit, the current signal for controlled resonant converter to be exported is converted into first voltage signal；Delay circuit, is exported for the progress delay of first voltage signal to be converted to after second voltage signal；The time delay of the delay circuit increases and reduced with first voltage signal；Voltage comparator circuit, for receiving second voltage signal and reference voltage signal, and second voltage signal and reference voltage signal is compared the break-make that controlled resonant converter is controlled with output control signal.Above-mentioned current foldback circuit, circuit overload for a long time causes the device for power switching of controlled resonant converter and magnetic device loss to increase and overheating failure where can avoiding controlled resonant converter while peak power is provided, thus improves the reliability of controlled resonant converter.
Description
Technical field
The utility model is related to electronic circuit field, more particularly to a kind of controlled resonant converter and its current foldback circuit.
Background technology
With the extensive use of Switching Power Supply, the LLC resonant converter in Switching Power Supply is also developed rapidly therewith.LLC goes here and there
It is the requirement that disclosure satisfy that high frequency to join controlled resonant converter, and very high conversion efficiency can be reached again.But due to LLC resonant converter
It is to be operated in 50% to determine pulsewidth, voltage stabilizing is realized by adjustment work frequency.When control chip by improve working frequency come
When limiting power output, if LLC resonant converter long-term work can cause device for power switching, magnetic device in this pattern
Loss increase, so as to cause overheating failure.
Utility model content
Based on this again, it is necessary to which device for power switching and magnetic can be protected by providing while one kind meets peak power output
The current foldback circuit of property device.
A kind of current foldback circuit, for being electrically connected with controlled resonant converter, to carry out excessively stream to the controlled resonant converter
Protection；Including：Current converter circuit, the current converter circuit is connected with the controlled resonant converter current output terminal, for inciting somebody to action
The current signal of the controlled resonant converter output is converted into first voltage signal；Delay circuit, the input of the delay circuit
It is connected with the output end of the current converter circuit；The delay circuit is used to the first voltage signal carrying out delay conversion
To be exported after second voltage signal；The time delay of the delay circuit increases and reduced with the first voltage signal；Voltage
Comparison circuit, the first input end of the voltage comparator circuit is connected with the output end of the delay circuit, described for receiving
Second voltage signal；Second input of the voltage comparator circuit is as reference voltage input, for receiving reference voltage
Signal；The output end of the voltage comparator circuit is used to be electrically connected with the controlled resonant converter；The voltage comparator circuit will
The second voltage signal and the reference voltage signal are compared controls the controlled resonant converter with output control signal
Break-make.
In one of the embodiments, the current foldback circuit also includes control circuit；It is described control circuit with it is described
Voltage comparator circuit output end is connected, and the voltage comparator circuit is by control signal described in the control circuit output, to control
Make the break-make of the controlled resonant converter.
In one of the embodiments, the control circuit includes the first diode；The negative pole of first diode with
The output end connection of the voltage comparator circuit, the positive pole of first diode is used to connect the controlled resonant converter.
In one of the embodiments, the control circuit also includes photoelectrical coupler, and the light of the photoelectrical coupler is sent out
The positive pole of emitter is used to connect external input voltage, and the negative pole of the optical transmitting set of the photoelectrical coupler connects the one or two pole
The positive pole of pipe；The optical receiver of the photoelectrical coupler is used to be connected with the controlled resonant converter.
In one of the embodiments, the current converter circuit include trans-impedance amplifier, the trans-impedance amplifier it is anti-
Phase input is connected with the current output terminal of the controlled resonant converter；The in-phase input end ground connection of the trans-impedance amplifier；It is described
The output end of trans-impedance amplifier and the input of the delay circuit are electrically connected with.
In one of the embodiments, the delay circuit includes charging delay circuit and discharge delay circuit；It is described to fill
Electrical delay circuit include series connection first resistor, second resistance, the second diode and the first electric capacity, the first resistor also with institute
The output end connection of current converter circuit is stated, positive pole of the second resistance also with second diode is connected, described second
The negative pole of diode is connected with the first end of first electric capacity, the second end ground connection of first electric capacity；The discharge delay
Circuit includes 3rd resistor, the 4th resistance, the 3rd diode and first electric capacity of series connection；The 3rd resistor also with it is described
The output end connection of current converter circuit, the other end of the 4th resistance is connected with the negative pole of the 3rd diode, described
The positive pole of 3rd diode is connected with the negative pole of second diode；The first end of first electric capacity is used as the deferred telegram
The output end on road.
In one of the embodiments, in addition to the reference voltage circuit；The reference voltage circuit includes the 5th electricity
Resistance, the 6th resistance and the 7th resistance；The first end of 5th resistance is used to receive reference voltage signal, the 5th resistance
The second end be connected with the 6th resistance；The 6th resistance other end ground connection；7th resistance and the 6th resistance
It is in parallel；Second end of the 5th resistance as the reference voltage circuit output end.
In one of the embodiments, the reference voltage circuit also includes the 8th resistance and the 4th diode；Described
One end of eight resistance is connected with the second input of the voltage comparator circuit, the other end and the described 4th of the 8th resistance
The positive pole connection of diode, the negative pole of the 4th diode is connected with the output end of the voltage comparator circuit.
In one of the embodiments, the voltage comparator circuit includes operational amplifier；The operational amplifier it is anti-
Phase input is connected with the output end of the delay circuit, and the in-phase input end of the operational amplifier is used to receive the benchmark
Voltage signal；The output end of the operational amplifier is used to be electrically connected with the controlled resonant converter.
A kind of controlled resonant converter, including switching network and resonant network, in addition to the mistake described in any of the above-described embodiment
Flow protection circuit；The input of the current foldback circuit is connected with the current output terminal of the resonant network, and the excessively stream is protected
The output end of protection circuit is connected with the switching network.
Above-mentioned current foldback circuit, for being electrically connected with controlled resonant converter, to carry out overcurrent protection to controlled resonant converter.
The output current of controlled resonant converter is converted into first voltage signal by the current foldback circuit, and first voltage signal passes through deferred telegram
It is input in voltage comparator circuit and is compared with reference voltage signal behind road, the logical of controlled resonant converter is controlled with output control signal
It is disconnected.First voltage signal increases with the increase of load, and the time delay of delay circuit shortens, during the work of controlled resonant converter
Between also and then shorten.Therefore, the thermal stress of power switch, magnetic device can be effectively reduced while peak power is provided,
The overload for a long time of circuit where controlled resonant converter can be avoided causes the device for power switching and magnetic device of controlled resonant converter to damage
Consumption increases and overheating failure, so as to improve the reliability of controlled resonant converter.
Brief description of the drawings
Fig. 1 be an embodiment in current foldback circuit theory diagram；
Fig. 2 be Fig. 1 in current converter circuit circuit diagram；
Fig. 3 be Fig. 1 in the current foldback circuit in addition to current converter circuit circuit diagram.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain
The utility model, is not used to limit the utility model.
Fig. 1 be an embodiment in current foldback circuit theory diagram.The current foldback circuit is used for and resonant transformation
Device is electrically connected with, to carry out overcurrent protection to controlled resonant converter.As shown in figure 1, a kind of current foldback circuit is changed including electric current
Circuit 110, delay circuit 120 and voltage comparator circuit 130.
Current converter circuit 110 is connected with controlled resonant converter current output terminal 10, the sampling electricity that controlled resonant converter is exported
Stream signal is converted into first voltage signal.The input of delay circuit 120 is connected with the output end of current converter circuit 110, will
First voltage signal carries out delay and is converted to output after second voltage signal.Wherein, the time delay of delay circuit 120 is with first
The increase of voltage signal and reduce.The first input end of voltage comparator circuit 130 is connected with the output end of delay circuit 120, is used
In reception second voltage signal.Second input of voltage comparator circuit 130 is used to receive reference voltage signal.Voltage ratio is more electric
The output end on road 130 is used to be electrically connected with controlled resonant converter.Voltage comparator circuit 130 is by second voltage signal and reference voltage
Signal is compared the break-make that controlled resonant converter is controlled with output control signal.
Above-mentioned current foldback circuit, current converter circuit 110 is connected with controlled resonant converter current output terminal 10, and resonance is become
The sample rate current of parallel operation output is converted into first voltage signal.First voltage signal is input to after delay circuit 120, delay circuit
120 output second voltage signals, and the second voltage signal of output is input in voltage comparator circuit 130 and reference voltage letter
Number compare, the break-make of controlled resonant converter is controlled with output control signal.First voltage signal with controlled resonant converter institute in circuit
Load increase and increase, the time delay of delay circuit 120 increases and shortened with the voltage of first voltage signal, so that humorous
Shake converter working time also and then shorten.It that is to say, the current foldback circuit can control circuit where controlled resonant converter
Working time under different overload conditions.Under conditions of overload is not serious, horse can be ensured to more energy are provided
Reach, the equipment such as motor normally starts.If load surcharge is overweight in circuit for controlled resonant converter institute, the current protecting circuit is in short-term
Interior shut-off controlled resonant converter, so as to can effectively reduce the heat of power switch, magnetic device while peak power is provided
Stress, it is to avoid the overload for a long time of circuit where controlled resonant converter causes the device for power switching and magnetic device of controlled resonant converter to damage
Consumption increases and overheating failure, therefore improves the reliability of controlled resonant converter.
In other embodiments, current foldback circuit also includes control circuit 140.Control the input and electricity of circuit 140
The connection of the output end of comparison circuit 130 is pressed, the output end of control circuit 140 is used to be connected with controlled resonant converter.Voltage comparator circuit
130 by controlling the output control signal of circuit 140, to control the break-make of controlled resonant converter.
In another embodiment, current foldback circuit also includes reference voltage circuit 150.Reference voltage circuit 150 it is defeated
Go out end to be connected with the second input of voltage comparator circuit 130, reference voltage signal is provided to voltage comparator circuit 130.
Fig. 2 be Fig. 1 in current converter circuit circuit diagram.As shown in Fig. 2 current converter circuit 110 includes putting across resistance
Big device U6-A.Trans-impedance amplifier U6-A inverting input is connected by resistance R129 with port IS2, and port IS2 becomes with resonance
Parallel operation current output terminal 10 is connected.Trans-impedance amplifier U6-A in-phase input end is grounded by resistance R127.Trans-impedance amplifier U6-
A output end OCP1 is electrically connected with the input OCP2 of delay circuit 120.Wherein, resistance R140, electric capacity C55, resistance
R128, resistance R129, resistance R142, electric capacity C54 and resistance R127 are defeated by controlled resonant converter together with trans-impedance amplifier U6-A
Go out current signal and carry out amplifier, and sampled current signals are converted into first voltage signal, pass through trans-impedance amplifier U6-A
Output end OCP1 be input in delay circuit 120.
Fig. 3 be Fig. 1 in the current foldback circuit in addition to current converter circuit circuit diagram.As shown in figure 3, delay circuit
120 include charging delay circuit and discharge delay circuit.Charging delay circuit includes the first resistor of series connection, second resistance, the
Two diodes and the first electric capacity.Wherein, first resistor is resistance R162, and second resistance is resistance R163, and the second diode is two
Pole pipe D28, the first electric capacity is electric capacity C69.Resistance R162 connects with resistance R163, and the resistance R162 other ends change electricity with electric current
The output end connection on road 110.Diode D28 positive pole is connected with resistance R163, and negative pole is connected with electric capacity C69.Electric capacity C69's is another
One end is grounded.The charging interval of charging delay circuit is filled by resistance R162, resistance R163 and diode D28 to electric capacity C69
Electric slope is determined.Discharge delay circuit includes 3rd resistor, the 4th resistance, the 3rd diode and the electric capacity C69 of series connection.Wherein,
3rd resistor is resistance R190, and the 4th resistance is resistance R191, and the 3rd diode is diode D29.Resistance R190 and resistance
R191 is connected, and the resistance R190 other ends are connected with the output end of current converter circuit 120.Diode D29 negative pole and resistance
R191 connections, positive pole is connected with electric capacity C69.Charging delay circuit and discharge delay circuit share electric capacity C69.Wherein, electric discharge is prolonged
The discharge time of slow circuit is determined by resistance R190, resistance R19 and diode D29 to electric capacity C69 electric discharge slope.Benchmark electricity
Volt circuit 150 includes the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance and the 4th diode.Wherein, the 5th resistance is
Resistance R160, the 6th resistance is resistance R169, and the 7th resistance is resistance R170, and the 8th resistance is resistance R161, the 4th diode
For diode D43.Resistance R160 one end is used to receive reference voltage signal, and the other end is connected with resistance R169.Resistance R170 with
Resistance R169 is in parallel.The output end of potential circuit 150 on the basis of the connection end that resistance R160 is connected with resistance R169.Resistance R161
One end is connected with the second input of voltage comparator circuit 130, and the other end is connected with diode D43 positive pole.Diode D43's
Negative pole is connected with the output end of voltage comparator circuit 130.Reference voltage when controlled resonant converter works is by resistance R160, resistance
R169, resistance R170 are determined.Working time is by the charging ramp of resistance R162, resistance R163 and diode D28 to C69 electric capacity
Determine.Controlled resonant converter is turned off after reference voltage when the voltage after by charging delay circuit rises to work.Resonance becomes
Reference voltage when changing device shut-off is determined by diode D43, resistance R161, resistance R160, resistance R170 and resistance R169.Close
The disconnected time is determined by resistance R191, resistance R190, diode D29 to electric capacity C69 electric discharge slope.When passing through discharge delay circuit
Controlled resonant converter works after reference voltage when voltage afterwards is reduced to shut-off.Voltage comparator circuit 130 is operational amplifier U8-
B.Operational amplifier U8-B in-phase input end is connected with resistance R170, operational amplifier U8-B inverting input and electric capacity
C69 connections, operational amplifier U8-B output end is connected with control circuit 140.Control circuit 140 include photoelectrical coupler and
Diode D27.The optical transmitting set OT2-B of photoelectrical coupler positive pole is used to connect external input voltage SVCC, photoelectrical coupler
Optical transmitting set OT2-B negative pole connection diode D27 positive pole, the optical receiver (not shown) and resonance of photoelectrical coupler
Converter is connected.Diode D27 positive pole is connected with output port OFFS.Output port OFFS is used for output control signal to humorous
Shake converter.Diode D27 negative pole is connected with operational amplifier U8-B output end.
As shown in figure 3, the input OCP2 of delay circuit 120 is with the trans-impedance amplifier U6-A's of current converter circuit 110
Output end OCP1 connections, the first voltage signal for receiving the output of current converter circuit 110.When controlled resonant converter output current
During increase, first voltage signal also can accordingly be raised in proportion with the increase of output current.First voltage signal passes through electricity
Hinder R162, resistance R163, diode D28, the RC retardation ratio of resistance R190, resistance R191, diode D29 and electric capacity C69 composition
After circuit, output second voltage signal is compared, so that operational amplifier into operational amplifier U8-B with reference voltage signal
U8-B output control signals are to control the break-make of controlled resonant converter.Controlled resonant converter work when reference voltage by resistance R160,
Resistance R169 and resistance R170 is determined.Working time is by resistance R162, resistance R163 and diode D28 to electric capacity C69's
Charging ramp determines, after the reference voltage when voltage of second voltage signal rises to work, controlled resonant converter shut-off.Resonance becomes
Reference voltage when changing device shut-off is determined by diode D43, resistance R161, resistance R160, resistance R170 and resistance R169.
Turn-off time is by resistance R191, resistance R190, electric discharge slope decisions of the diode D29 to electric capacity C69, the electricity of second voltage signal
Controlled resonant converter works after reference voltage when pressure is reduced to shut-off.When there is serious overload, the voltage of first voltage signal
Will be higher, also can be faster by the rate of rise of the arrival reference voltage of RC retardation ratio circuit, controlled resonant converter is in overload condition
Under working time will be shorter.Therefore, the current foldback circuit in the present embodiment is effective while peak power is provided
Power switch pipe is reduced, the thermal stress of magnetic device improves the reliability of controlled resonant converter.
The working method of current foldback circuit is：Controlled resonant converter output current is input to by port IS2 amplifies across resistance
In device U6-A.Trans-impedance amplifier U6-A amplifies the current signal collected, and is converted into first voltage signal.Pass through port
OCP1 is input in the delay circuit 120 of resistance capacitance composition.The rising that delay circuit 120 changes first voltage signal voltage is oblique
Rate after descending slope with reference voltage with being compared.Delay circuit 120 is by exporting second voltage signal to operational amplifier U8-B
In compared with reference voltage.After second voltage signal voltage rises to reference voltage, operational amplifier U8-B output low levels,
Drag down output port OFFS voltage to turn off controlled resonant converter by diode D27.Conversely, second voltage signal voltage declines
To after reference voltage, operational amplifier U8-B output high level, output port OFFS is high level, controlled resonant converter work.Cause
This, the current foldback circuit effectively controls on off state during controlled resonant converter excessively stream.Operational amplifier U8-B output is led to
Light-coupled isolation is crossed to control feedback signal.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and it describes more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that for the common skill of this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
Protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of current foldback circuit, for being electrically connected with controlled resonant converter, to carry out excessively stream guarantor to the controlled resonant converter
Shield；It is characterised in that it includes：
Current converter circuit, the current converter circuit is connected with the controlled resonant converter current output terminal, for will be described humorous
The current signal of the converter that shakes output is converted into first voltage signal；
Delay circuit, the input of the delay circuit is connected with the output end of the current converter circuit；The delay circuit
Exported for first voltage signal progress delay to be converted to after second voltage signal；The time delay of the delay circuit
Increase with the first voltage signal and reduce；
Voltage comparator circuit, the first input end of the voltage comparator circuit is connected with the output end of the delay circuit, is used for
Receive the second voltage signal；Second input of the voltage comparator circuit is as reference voltage input, for receiving
Reference voltage signal；The output end of the voltage comparator circuit is used to be electrically connected with the controlled resonant converter；The voltage ratio
The second voltage signal and the reference voltage signal are compared compared with circuit the resonance is controlled with output control signal
The break-make of converter.
2. current foldback circuit according to claim 1, it is characterised in that the current foldback circuit also includes control electricity
Road；The control circuit is connected with the voltage comparator circuit output end, and the voltage comparator circuit passes through the control circuit
The control signal is exported, to control the break-make of the controlled resonant converter.
3. current foldback circuit according to claim 2, it is characterised in that the control circuit includes the first diode；
The negative pole of first diode is connected with the output end of the voltage comparator circuit, and the positive pole of first diode is used to connect
Connect the controlled resonant converter.
4. current foldback circuit according to claim 3, it is characterised in that the control circuit also includes photoelectric coupling
Device, the positive pole of the optical transmitting set of the photoelectrical coupler is used to connect external input voltage, the light transmitting of the photoelectrical coupler
The negative pole of device connects the positive pole of first diode；The optical receiver of the photoelectrical coupler is used for and the controlled resonant converter
Connection.
5. current foldback circuit according to claim 1, it is characterised in that the current converter circuit is included across resistance amplification
Device, the inverting input of the trans-impedance amplifier is connected with the current output terminal of the controlled resonant converter；The trans-impedance amplifier
In-phase input end ground connection；The output end of the trans-impedance amplifier and the input of the delay circuit are electrically connected with.
6. current foldback circuit according to claim 1, it is characterised in that the delay circuit includes charging delay circuit
With discharge delay circuit；The charging delay circuit includes first resistor, second resistance, the second diode and the first electricity of series connection
Hold, output end of the first resistor also with the current converter circuit be connected, the second resistance also with the two or two pole
The positive pole connection of pipe, the negative pole of second diode is connected with the first end of first electric capacity, and the of first electric capacity
Two ends are grounded；The discharge delay circuit includes 3rd resistor, the 4th resistance, the 3rd diode and first electricity of series connection
Hold；Output end of the 3rd resistor also with the current converter circuit is connected, the other end of the 4th resistance and described the
The negative pole connection of three diodes, the positive pole of the 3rd diode is connected with the negative pole of second diode；First electricity
The first end of appearance as the delay circuit output end.
7. current foldback circuit according to claim 1, it is characterised in that also including reference voltage circuit；The benchmark
Potential circuit includes the 5th resistance, the 6th resistance and the 7th resistance；The first end of 5th resistance is used to receive with reference to electricity
Signal is pressed, the second end of the 5th resistance is connected with the 6th resistance；The 6th resistance other end ground connection；Described 7th
Resistance and the 6th resistor coupled in parallel；Second end of the 5th resistance as the reference voltage circuit output end.
8. current foldback circuit according to claim 7, it is characterised in that the reference voltage circuit also includes the 8th electricity
Resistance and the 4th diode；One end of 8th resistance is connected with the second input of the voltage comparator circuit, and the described 8th
The other end of resistance is connected with the positive pole of the 4th diode, negative pole and the voltage comparator circuit of the 4th diode
Output end connection.
9. current foldback circuit according to claim 1, it is characterised in that the voltage comparator circuit includes operation amplifier
Device；The inverting input of the operational amplifier is connected with the output end of the delay circuit, the same phase of the operational amplifier
Input is used to receive the reference voltage signal；The output end of the operational amplifier is used for electrical with the controlled resonant converter
Connection.
10. a kind of controlled resonant converter, including switching network and resonant network, it is characterised in that also including the claims
Current foldback circuit described in any one of 1-9；The electric current of the input of the current foldback circuit and the resonant network is exported
End connection, the output end of the current foldback circuit is connected with the switching network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621284400.0U CN206364500U (en) | 2016-11-25 | 2016-11-25 | Controlled resonant converter and its current foldback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621284400.0U CN206364500U (en) | 2016-11-25 | 2016-11-25 | Controlled resonant converter and its current foldback circuit |
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|---|---|
| CN206364500U true CN206364500U (en) | 2017-07-28 |
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| CN201621284400.0U Active CN206364500U (en) | 2016-11-25 | 2016-11-25 | Controlled resonant converter and its current foldback circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108418404A (en) * | 2018-03-29 | 2018-08-17 | 深圳茂硕电子科技有限公司 | It is a kind of to enter the controllable circuit of interval point and its method |
| CN108809069A (en) * | 2018-07-30 | 2018-11-13 | 广州金升阳科技有限公司 | A kind of monocycle peak current limit circuit |
-
2016
- 2016-11-25 CN CN201621284400.0U patent/CN206364500U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108418404A (en) * | 2018-03-29 | 2018-08-17 | 深圳茂硕电子科技有限公司 | It is a kind of to enter the controllable circuit of interval point and its method |
| CN108418404B (en) * | 2018-03-29 | 2024-01-30 | 深圳茂硕电子科技有限公司 | Circuit capable of controlling intermittent point entering and method thereof |
| CN108809069A (en) * | 2018-07-30 | 2018-11-13 | 广州金升阳科技有限公司 | A kind of monocycle peak current limit circuit |
| CN108809069B (en) * | 2018-07-30 | 2023-09-08 | 广州金升阳科技有限公司 | Single-period peak current limiting circuit |
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