CN206226795U - Error amplification device and the drive circuit comprising the error amplification device - Google Patents
Error amplification device and the drive circuit comprising the error amplification device Download PDFInfo
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- CN206226795U CN206226795U CN201621349917.3U CN201621349917U CN206226795U CN 206226795 U CN206226795 U CN 206226795U CN 201621349917 U CN201621349917 U CN 201621349917U CN 206226795 U CN206226795 U CN 206226795U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model provides a kind of error amplification device and the drive circuit comprising the error amplification device,In the error amplifier device that the utility model is provided,Pulse generating circuit produces the first pulse and the second pulse according to the output voltage of error amplifier block,Forward-backward counter carries out plus-minus counting to the first pulse and the second pulse,Count value size reflects the height of offset voltage,Using count value as loop control signal,So,Can be by setting the digit of forward-backward counter,So that within the cycle of exchange 50Hz/60Hz,The variation very little of the loop control signal corresponding to forward-backward counter,Reach the effect for filtering 50Hz/60Hz AC ripples,Above measure is conducive to reducing the size of compensating electric capacity,Thus the compensating electric capacity of loop can be integrated into inside IC,Simplify periphery design,Eliminate influence of the moist electric leakage to loop.
Description
Technical field
The utility model is related to a kind of error amplification device and the drive circuit comprising the error amplification device.
Background technology
Traditional buck configuration constant current driver circuit for LED Alternating Current Power Supply, with power factor adjustment (PFC) function is as schemed
Shown in 1, mainly include：AC input rectification circuit 101, input AC source 102, input capacitance Cin, inductance L1, power switch M1,
Sampling resistor Rs, sustained diode 1, output capacitance Cbulk, output current sample circuit 111, error amplifier 112, compensation
Electric capacity Ccomp, pwm signal generation circuit 113.
Wherein, AC input rectification circuit 101 receives the AC-input voltage of input AC source 102 and to its rectification；Input
One end connection input voltage incoming end Vin of electric capacity Cin, its other end ground connection；The source connection input voltage of power switch M1
Incoming end Vin, one end of its drain terminal connection sampling resistor Rs, its grid end receives the drive signal of pwm signal generation circuit 113；
One end of inductance L1 connects the other end of sampling resistor Rs, one end of the other end connection output capacitance Cbulk of inductance L1；Afterflow
One end of the negative electrode connection sampling resistor Rs of diode D1, the other end of its anode connection output capacitance Cbulk；Output capacitance
Cbulk is in parallel with load, such as in parallel with LED load；Sampling resistor Rs sampled output currents, are switched with driving power
M1。
The output current sample circuit 111 by the voltage Vcs on sampling resistor Rs carried out sampling be calculated it is defeated
Go out current sample voltage；The output current sampled voltage that the error amplifier 112 calculates output current sample circuit 111
Error is done with reference voltage V ref to amplify, export offset voltage Vcomp, the output end connection compensating electric capacity of error amplifier 112
Ccomp, after loop stability, offset voltage Vcomp is substantially stationary, and output current is determined by reference voltage V ref；The pwm signal
The output end of the connection error amplifier 112 of circuit 113 and the grid end of power switch M1 are produced, the conducting to power switch M1 is realized
Driven with shut-off.
When power switch M1 is turned on, input current flows through sampling resistor Rs, inductance L1, output capacitance Cbulk, output end
Vout, the electric current for flowing through inductance L1 increases, inductance L1 storage energies.After power switch M1 is turned off, the electric current of inductance L1 is flowed through
Through the afterflow of sustained diode 1, the electric current for flowing through inductance L1 is gradually reduced, and inductance L1 releases energy to output capacitance Cbulk and defeated
Go out to hold Vout.When the voltage Vcs on sampling resistor Rs is less than reference voltage V ref, produced through error amplifier 112 and pwm signal
The raw conducting power switch M1 of circuit 113.Power switch M1 repeats switch motion above, circuit continuous firing, all the time in electricity
Inducing current critical conduction mode.
However, because the signal of the input of input AC source 102 is typically the AC signal that frequency is 50Hz/60Hz, output
The output current sampled voltage that current sampling circuit 111 is calculated is also the signal that ripple is embossed with 50Hz/60Hz, in order to filter
The interference signal of 50Hz/60Hz, compensating electric capacity Ccomp can not obtain too small, and more than 1 μ F are typically greater than in side circuit, this
The compensating electric capacity for planting size cannot be integrated into IC interior, can only accomplish chip exterior, and this is easy for being subject to moist electric leakage
Influence so that influence output current, be also unfavorable for the simplification of periphery circuit.
Utility model content
The purpose of this utility model is to provide a kind of error amplification device and the driving comprising the error amplification device
Circuit, to solve existing technical problem.
According to one side of the present utility model, there is provided a kind of error amplification device, including：
Error amplifier block；
Pulse generating circuit, connects the error amplifier block, and according to the output electricity of the error amplifier block
Pressure produces the first pulse and the second pulse；
Forward-backward counter, it is a preset value that the forward-backward counter counts digit, connects the pulse generating circuit,
And plus-minus counting is carried out to the first pulse and the second pulse, output one reflects the loop control signal of offset voltage size, described
Loop control signal directly controls a pwm signal, or, the loop control signal goes control one again after being converted into analog signal
Pwm signal, to filter AC ripple.
Optionally, in described error amplification device, in a Part I for exchanging half cycle, the addition and subtraction is counted
The count value of device increases；In a Part II for exchanging half cycle, the count value of the forward-backward counter reduces；In a friendship
In stream half cycle, plus coujnt is equal to subtraction count, and loop reaches stabilization.
Optionally, in described error amplification device, the pulse generating circuit includes producing the first of the first pulse
Second pulse generating circuit of the second pulse of pulse generating circuit and generation.
Optionally, in described error amplification device, the error amplifier block includes：First timing circuit is produced
Circuit, the first electric capacity, first switch, first comparator, the second timing circuit produce circuit, the second electric capacity, second switch and the
Two comparators；
The positive input terminal of the first comparator connect first timing circuit produce circuit, one end of the first electric capacity and
The source of first switch, the negative input end of the first comparator connects one first reference voltage, the first comparator it is defeated
Go out the input of end connection first pulse generating circuit；
The output end of first pulse generating circuit and the grid end of first switch connect the one of the forward-backward counter
Input, the other end of first electric capacity is grounded with the drain terminal of the first switch；
The positive input terminal of second comparator connect second timing circuit produce circuit, one end of the second electric capacity and
The source of second switch, the negative input end of second comparator connects one second reference voltage, second comparator it is defeated
Go out the input of end connection second pulse generating circuit；
The output end of second pulse generating circuit and the grid end of second switch connect the another of the forward-backward counter
One input, the other end of second electric capacity is grounded with the drain terminal of the second switch.
Optionally, in described error amplification device, first timing circuit produces circuit in a reference voltage control
First electric capacity is charged under system, the first comparator upset, institute when charging voltage reaches first reference voltage
State the first pulse generating circuit and produce first pulse, first switch conducting is described to remove described in first Pulse Width Control
Voltage on first electric capacity, then starts to charge next time and pulses generation；Second timing circuit produces circuit defeated one
Go out under current sampling signal control and second electric capacity is charged, the described in when charging voltage reaches second reference voltage
Two comparators overturn, one the second pulse of the second pulse generating circuit generation, and second opens described in second Pulse Width Control
Conducting is closed to remove the voltage on second electric capacity, then starts to charge next time and pulses generation.
Optionally, in described error amplification device, current value, the of circuit are produced according to first timing circuit
Two electric capacity, the second reference voltage, the first electric capacity, the numerical value of the first reference voltage determine that second timing circuit produces circuit
Average value.
Optionally, in described error amplification device, the error amplifier block includes：Error amplifier, electric capacity,
First switch, first comparator, second switch and the second comparator；
The positive input terminal of the error amplifier connects a reference voltage, the negative input end connection one of the error amplifier
Output current sampled signal, the positive input terminal and second of the output end connection first comparator of the error amplifier compares
The positive input terminal of device；
The negative input end of the first comparator connects one the 3rd reference voltage, the output end connection of the first comparator
The input of first pulse generating circuit；
The output end of first pulse generating circuit connects an input of the forward-backward counter, first arteries and veins
The pulse signal (the first pulse) of punching generation circuit output controls the break-make of the first switch；
The negative input end of second comparator connects one the 4th reference voltage, the output end connection of second comparator
The input of second pulse generating circuit；
The output end of second pulse generating circuit connects another input of the forward-backward counter, described second
The pulse signal (the second pulse) of pulse generating circuit output controls the break-make of the second switch；
Described electric capacity one end connects the output end of the error amplifier, other end ground connection.
Optionally, in described error amplification device, when the positive input terminal input voltage of the error amplifier is more than
Negative input end input voltage, the electric capacity is charged, and first pulse is produced when charging voltage is more than three reference voltages, the
One pulse causes that first switch is turned on, and the current potential of electric capacity is haled to 1/2* (the 3rd the+the four reference voltage of reference voltage)；Work as institute
The positive input terminal input voltage of error amplifier is stated less than negative input end input voltage, the electric capacity electric discharge, when discharge voltage is low
Second pulse is produced when four reference voltages, the second pulse causes that second switch is turned on, the current potential of electric capacity haled to
1/2* (the 3rd the+the four reference voltage of reference voltage).
Optionally, in described error amplification device, the voltage difference that the corresponding electric capacity of first pulse charges is
1/2* (the 3rd the-the four reference voltage of reference voltage), the voltage difference of the corresponding electric capacity electric discharge of second pulse is also 1/2*
(the 3rd the-the four reference voltage of reference voltage), if exchanging half cycle at one, the first pulse is identical with the second counted number of pulses,
Represent that electric capacity charging and discharging is identical.
Optionally, in described error amplification device, the error amplifier is transconductance type error amplifier.
Optionally, in described error amplification device, the pulse generating circuit includes a 3rd pulse generation electricity
Road, the pulse signal exported by the 3rd pulse generating circuit obtains first pulse and the second pulse.
Optionally, in described error amplification device, the error amplifier block includes：Error amplifier, electric capacity,
Switch, first comparator, the second comparator, four selecting switch and phase inverter；
The positive input terminal of the error amplifier connects a reference voltage, the negative input end connection one of the error amplifier
Output current sampled signal；
The positive input terminal of the first comparator connects the 5th reference voltage, the negative input end connection of the first comparator
The output end of the error amplifier, the output end of the first comparator connects the input of the 3rd pulse generating circuit
And phase inverter, the 5th reference voltage is 1/2* (the 3rd the+the four reference voltage of reference voltage)；
The positive input terminal of second comparator connects the electric capacity and is referred to with the 3rd by four selecting switch
Voltage or the 4th reference voltage, the output end of second comparator connect the input of the 3rd pulse generating circuit；
The output end of the 3rd pulse generating circuit connects the input of the forward-backward counter, the 3rd pulse
Switched on-off described in the pulse signal control that circuit output occurs.
Optionally, in described error amplification device, when the positive input terminal input voltage of the error amplifier is more than
Negative input end input voltage, the electric capacity charges, when charging voltage is more than 1/2* (the 3rd the+the four reference voltage of reference voltage)
When, the first comparator exports first switch selection signal, and the positive input terminal of the comparator connects the electric capacity, negative input
The 3rd reference voltage of end connection, while first switch selection signal controls the 3rd pulse generating circuit, when charging voltage is more than the
Produce first pulse, first pulse to cause switch conduction during three reference voltages, the current potential of the electric capacity haled to
1/2* (the 3rd the+the four reference voltage of reference voltage)；When the positive input terminal input voltage of the error amplifier is less than negative input
End input voltage, the electric capacity electric discharge is described when discharge voltage is less than 1/2* (the 3rd the+the four reference voltage of reference voltage)
First comparator exports second switch selection signal, and the positive input terminal of second comparator connects the 4th reference voltage, negative defeated
Enter the end connection electric capacity, produce second pulse, second pulse to make when discharge voltage is less than four reference voltages
Switch conduction is obtained, the current potential of the electric capacity is haled to 1/2* (the 3rd the+the four reference voltage of reference voltage).
Optionally, in described error amplification device, the voltage difference that the corresponding electric capacity of first pulse charges is
1/2* (the 3rd the-the four reference voltage of reference voltage), the voltage difference of the corresponding electric capacity electric discharge of second pulse is also 1/2*
(the 3rd the-the four reference voltage of reference voltage), if exchanging half cycle at one, the first pulse is identical with the second counted number of pulses,
Represent that electric capacity charging and discharging is identical.
Optionally, in described error amplification device, the forward-backward counter uses trigger structure.
Optionally, in described error amplification device, the forward-backward counter is decimal add subtraction count device, institute
The counting digit for stating forward-backward counter is 10 or 15.
Optionally, in described error amplification device, the error amplification device be used in Closed-loop Constant-current control circuit,
In closed loop constant-voltage control circuit or closed loop constant-power control circuit.
Optionally, in described error amplification device, the error amplification device is used in buck configuration, boosting knot
In structure, Flyback configuration or lifting laminated structure.
According to another side of the present utility model, there is provided a kind of drive circuit, including error amplification device as described above.
Optionally, in described drive circuit, also include：Output current sample circuit and pwm signal generation circuit；It is described
The input of error amplifier connects the output current sample circuit, and the output end of the error amplifier connects the PWM
Signal generating circuit.
In the error amplification device that the utility model is provided, output of the pulse generating circuit according to error amplifier block
Voltage produces the first pulse, the second pulse and counting direction signal, and counter is according to counting direction signal to the first pulse and the
Two pulses carry out plus-minus counting, and count value size reflects the height of offset voltage, and the output signal of counter is used as loop control
Signal processed, by the digit for setting counter so that within the cycle of exchange 50Hz/60Hz, the loop control corresponding to counter
The variation very little of signal processed, thus reaches the effect for filtering 50Hz/60Hz AC ripples, and above measure reduces compensating electric capacity
Size, thus loop compensation electric capacity can be integrated into inside IC, simplify periphery design, eliminate shadow of the moist electric leakage to loop
Ring, also, due to carrying out plus-minus counting using forward-backward counter, it is only necessary to the digit of counter is set and then loop control is obtained
Signal processed, without the transmission signal alignd with AC wave shape, circuit realize it is simpler, loop be easier stabilization.
Brief description of the drawings
Fig. 1 is the buck configuration constant current driver circuit for LED structural representation of prior art；
Fig. 2 is the error amplification device electrical block diagram that the utility model first embodiment is provided；
Fig. 3 is the voltage relationship schematic diagram in burst pulse and compensating electric capacity in Fig. 2；
Fig. 4 is loop control signal and input AC rectified waveform relation schematic diagram；
Fig. 5 is the error amplification device electrical block diagram that the utility model second embodiment is provided；
Fig. 6 is the error amplification device electrical block diagram that the utility model 3rd embodiment is provided；
The driving circuit structure schematic diagram that Fig. 7 the utility model fourth embodiment is provided.
Specific embodiment
Core concept of the present utility model is, there is provided a kind of error amplification device, including：Error amplifier block, arteries and veins
There is circuit and forward-backward counter circuit in punching；The pulse generating circuit connection error amplifier block, and according to
The output voltage of the error amplifier block produces the first pulse and the second pulse；The forward-backward counter connects the arteries and veins
There is circuit in punching, and carry out addition and subtraction counting to the first pulse and the second pulse, and count value size reflects the height of offset voltage
It is low, using the count value as loop control signal, by the digit for setting counter so that in the cycle of exchange 50Hz/60Hz
It is interior, the variation very little of the loop control signal corresponding to counter.The utility model digitizes offset voltage using counter,
And by the digit for setting counter so that within the cycle of exchange 50Hz/60Hz, the loop control letter corresponding to counter
Number variation very little, reach the effect for filtering 50Hz/60Hz AC ripples, loop control voltage control pwm signal is produced, can be with
Accomplish loop control voltage and input ac voltage ripple it is basic it doesn't matter, to reduce the size of compensating electric capacity.Also, by
In carrying out plus-minus counting using forward-backward counter, it is only necessary to set the digit of counter and then obtain loop control signal, and
The transmission signal that need not be alignd with AC wave shape, circuit realize it is simpler, loop be easier stabilization.
Below in conjunction with the drawings and specific embodiments to the utility model proposes error amplification device make further specifically
It is bright.According to following explanation and claims, advantages and features of the present utility model will become apparent from.It should be noted that, accompanying drawing is equal
Non- accurately ratio is used in the form of simplifying very much and, is only used to convenience, lucidly aided in illustrating the utility model reality
Apply the purpose of example.
First embodiment
Fig. 2 is the error amplification device electrical block diagram of the utility model first embodiment.The error amplifies dress
Put including：First timing circuit produces circuit I 1, the first electric capacity C21, first switch M2, first comparator 201, the first pulse hair
Raw circuit 202, the second timing circuit produce circuit I 2, the second electric capacity C22, second switch M3, the second comparator 203, the second arteries and veins
There is circuit 204 and forward-backward counter 205, the count value size reflection offset voltage of the forward-backward counter 205 in punching
Height, using count value as loop control signal, the loop control signal directly controls a pwm signal, or, the ring
Road control signal goes to control a pwm signal again after being converted into analog signal, i.e. directly using the output of forward-backward counter 205
Data signal goes control loop.
Specifically as shown in Fig. 2 reference voltage V ref controls first timing circuit to produce circuit I 1, first timing
The source of current generating circuit I1, one end of the first electric capacity C21 and first switch M2 connects the positive input of first comparator 201
End, the negative input end of the first comparator 201 connects one first reference voltage VA, the output end of the first comparator 201
Connect the input of the first pulse generating circuit 202, the output end of first pulse generating circuit 202 and first switch M2's
Grid end connects an input of forward-backward counter 205；The other end of the first electric capacity C21 connects with the drain terminal of first switch M2
Ground.The output current sample circuit 208 is calculated output current by carrying out sampling to the voltage Vcs on sampling resistor Rs
Controlling the second timing circuit to produce circuit I 2, second timing circuit produces circuit I 2, the second electric capacity C22 to sampled signal
The source of one end and second switch M3 connects the positive input terminal of the second comparator 203, the negative input end of second comparator 203
One second reference voltage VB is connected, the output end of second comparator 203 connects the input of the second pulse generating circuit 204
The one of end, the output end of second pulse generating circuit 204 and the grid end connection forward-backward counter 205 of second switch M3 is defeated
Enter end；The other end of the second electric capacity C22 is grounded with the drain terminal of second switch M3.The output of the forward-backward counter 205
The loop control signal of output is held to be used to control loop.
With reference to shown in Fig. 2 and Fig. 3, reference voltage V ref controls the first timing circuit to produce circuit I 1, the first timing circuit
1 couple of the first electric capacity C21 of circuit I is produced to charge, when charging voltage reaches the first reference voltage VA, first comparator 201 overturns,
A first pulse CK1 is produced through the first pulse generating circuit 202, the first pulse CK1 control first switch M2 conductings remove the
Voltage on one electric capacity C21, then starts to charge next time and pulses generation again, and the number of such first pulse CK1 pulses is just
Illustrate the number of times that I1 is charged to the first reference voltage VA to the first electric capacity C21.Equally, output current sampled signal control the
Two timing circuits produce circuit I 2, and the second timing circuit produces 2 couples of the second electric capacity C22 of circuit I to charge, when charging voltage reaches the
During two reference voltage VB, the second comparator 203 is overturn, and a second pulse CK2 is produced through the second pulse generating circuit 204, the
Two pulse CK2 control second switch M3 conductings, remove the voltage on the second electric capacity C22, then start to charge next time and arteries and veins again
Punching is produced, and the number of such second pulse CK2 has meant that the second timing circuit produces 2 couples of the second electric capacity C22 of circuit I to fill
To the number of times of the second reference voltage VB.
Wherein, forward-backward counter 205 produces addition and subtraction to count；The first situation, addition meter is used to the first pulse CK1
Number, subtraction count is used to the second pulse CK2；Second situation, uses plus coujnt, to the first pulse to the second pulse CK2
CK1 uses subtraction count.Used as a nonrestrictive example, forward-backward counter 205 uses trigger structure.
With reference to Fig. 4, the relation of loop control signal and input AC rectified waveform exchanges half cycle top half at one,
Resultant effect is plus coujnt, and the count value of forward-backward counter 205 increases；One exchange half cycle the latter half, resultant effect
It is subtraction count, the count value of forward-backward counter 205 reduces；By the digit for setting forward-backward counter 205 so that
In one exchange half cycle, the output loop control signal of forward-backward counter 205 changes very little, and AC ripple is filtered to reach；
Exchanged in half cycle at one, plus coujnt is equal to subtraction count, the loop that loop control signal is controlled reaches stabilization.
Specifically, exchanged in half time-of-week at one, count value changes may be very big, such as plus coujnt 100 times,
Subtraction count be also 100 times, it is necessary to the control signal changed corresponding to 100 count values is basically unchanged, so can be only achieved filter
Except the effect of AC ripple.Original forward-backward counter 205 sets the binary numeral that total digit is 10, i.e., 1024
Maximum control signal excursion required for counting correspondence, then 100 countings occur can cause control signal variation too big, reach
Less than the effect for filtering AC ripple, by increasing the digit of counter, such as increase by 5, then total counting digit is 15,
Maximum control signal excursion required for then 32768 countings are corresponding, it is assumed that still using required for 10 correspondences of highest
Maximum control signal excursion, then 100 countings cause control signal to vary less, have filtered AC ripple.In this way, can
By the digit for setting forward-backward counter so that within the cycle of exchange 50Hz/60Hz, the ring corresponding to forward-backward counter
The variation very little of road control signal, reaches the effect for filtering 50Hz/60Hz AC ripples.Certainly, the utility model is not limited
The specific counting digit of forward-backward counter, it would however also be possible to employ other count the forward-backward counter of digit, as long as reach filtering
The purpose of AC ripple.
After loop stability, half cycle is exchanged at one, there is following relation to set up：
I1 × C22 × VB=I2avg × C21 × VA
Wherein, I1 is the current value that first timing circuit produces circuit, and C22 is the capacitance of second electric capacity,
VB is the magnitude of voltage of second reference voltage, and I2avg is the current average that second timing circuit produces circuit, C21
It is the capacitance of first electric capacity, VA is the magnitude of voltage of first reference voltage.I2avg represents the big of output current
It is small, as long as the equation represents that setting the first timing circuit produces circuit I 1, the second electric capacity C22, the second reference voltage VB, first
Electric capacity C21, the numerical value of the first reference voltage VA just can determine that the second timing circuit produces the average value of circuit I 2, namely determine
The size of output current.The effect of the signal of the output of forward-backward counter 205 is equal to the loop compensation electricity in structure shown in Fig. 1
Pressure Vcomp.
The data signal of the output of forward-backward counter 205 can directly go to control pwm signal, adjust the duty of pwm signal
Than reaching the purpose of stabilization output current through the negative-feedback of loop.The data signal of the output of the forward-backward counter 205 also may be used
To be first converted into analog signal, then go to control pwm signal, adjust the dutycycle of pwm signal, stabilization is reached through the negative-feedback of loop
The purpose of output current.
Second embodiment
Due to using two the first electric capacity C21, the second electric capacity C22 in Fig. 2, relate to and to the problem of Circuit Matching, therefore, this
In embodiment the first electric capacity C21 and the second electric capacity C22 is substituted using an electric capacity C31.Also, use an error amplifier
401 substitute the first timing circuit produces the timing circuit of circuit I 1 and second to produce circuit I 2, and the error amplifier 401 is generally
Transconductance type error amplifier.
Fig. 5 is error amplification device electrical block diagram in the utility model second embodiment.As shown in figure 5, described
Error amplifier block includes：Error amplifier 401, electric capacity C31, first switch 403, first comparator 201, second switch
404 and second comparator 203.
Wherein, two inputs of error amplifier 401 connect reference voltage Vref and output current sampled signal respectively,
The positive input terminal and the positive input terminal of the second comparator 203 of the output end connection first comparator 201 of error amplifier 401, the
The negative input end of one comparator 201 connects one the 3rd reference voltage VC, and the output end of first comparator 201 connects the first pulse hair
The input of raw circuit 202, the output end of the first pulse generating circuit 202 connects an input of forward-backward counter 205, the
The pulse signal (the first pulse) of the output of one pulse generating circuit 202 controls the break-make of first switch 403；Second comparator 203
Negative input end connect one the 4th reference voltage VD, the output end of the second comparator 203 connects the second pulse generating circuit 204
Input, the output end of the second pulse generating circuit 204 connects another input of forward-backward counter 205, the second pulse hair
The pulse signal (the second pulse) of the raw output of circuit 204 controls the break-make of second switch 404；Electric capacity C31 one end connects the mistake
The output end of difference amplifier 401, other end ground connection.
When the positive input terminal input voltage of error amplifier 401 is more than negative input end input voltage, electric capacity C31 charges, when
When charging voltage is more than the 3rd reference voltage VC, one first pulse CK1, the first pulse CK1 is produced to cause that first switch 403 is led
Logical, the current potential of electric capacity C31 is haled to 1/2* (VC+VD)；When the positive input terminal input voltage of error amplifier 401 is defeated less than negative
Enter and hold input voltage, electric capacity C31 electric discharges, when discharge voltage is less than the 4th reference voltage VD, produce a second pulse CK2,
Second pulse CK2 causes that second switch 404 is turned on, and the current potential of electric capacity C31 is haled to 1/2* (VC+VD)；The He of first switch 403
Second switch 404 can be shared.
Because the voltage difference that the corresponding electric capacity C31 of the first pulse CK1 pulses charges is 1/2* (VC-VD), the second pulse
The voltage difference of the corresponding electric capacity C31 electric discharges of CK2 pulses is also 1/2* (VC-VD), that is, the difference for changing is identical, if then one
Individual exchange half cycle, the first pulse CK1 and the second pulse CK2 count values are identical, have meant that electric capacity C31 charging and dischargings are identical
, it can thus be appreciated that the positive input terminal of error amplifier is identical with negative input end voltage, namely realize the effect of error amplifier.
3rd embodiment
Fig. 6 is the utility model 3rd embodiment error amplification device electrical block diagram.As shown in fig. 6, this implementation
Example is to merge the first pulse generating circuit and the second pulse generating circuit on the basis of Fig. 5, i.e., using a 3rd pulse hair
Raw circuit 503.The input of the second comparator 502 connects electric capacity C31, VC, VD by selecting switch, and first comparator 501 is obtained
To first switch selection signal S1 and second switch selection signal S2；First switch selection signal S1 also controls the 3rd pulse generation
Circuit 503, the 3rd pulse generating circuit 503 produces pulse signal, controls counting direction to enter by first switch selection signal S1
And obtain the first pulse CK1 and the second pulse CK2, i.e., first from the pulse signal of the output of the 3rd pulse generating circuit 503
Switch selection signal S1 determines the counting direction of forward-backward counter 205, to obtain the first pulse CK1 and the second pulse CK2.
Specifically, the error amplifier block includes：Error amplifier 401, electric capacity C31, switch 403, first compare
Compared with device 501, the second comparator 502, selecting switch 601,602,603,604, phase inverter 504.Wherein, error amplifier 401
Two inputs connect reference voltage Vref and output current sampled signal respectively；The positive input terminal connection of first comparator 501
5th reference voltage 1/2* (VC+VD), negative input end connects the output end of error amplifier 401, and output end connects the 3rd pulse
There is the input and phase inverter 504 of circuit 503；The positive input terminal of the second comparator 502 is connected by selecting switch 601,602
Electric capacity C31 or VD, negative input end connect electric capacity C31 or VC by selecting switch 603,604, and output end connects the 3rd pulse generation
The input of circuit 503；The output end of the 3rd pulse generating circuit 503 connects the input of forward-backward counter 205, the 3rd arteries and veins
There is the break-make of the pulse signal controlling switch 403 of the output of circuit 503 in punching.
When the positive input terminal input voltage of error amplifier 401 is more than negative input end input voltage, electric capacity C31 charges, when
When charging voltage is more than 1/2* (VC+VD), the output first switch selection signal S1 of first comparator 501, first switch selection letter
Number S1 control selections switch 601,604 is closed so that the positive input terminal connection electric capacity C31 of comparator 502, negative input end connection the
Three reference voltage VC, meanwhile, first switch selection signal S1 controls the 3rd pulse generating circuit 503, when charging voltage is more than the
During three reference voltage VC, one first pulse CK1, the first pulse CK1 is produced to cause that switch 403 is turned on, the current potential quilt of electric capacity C31
Hale 1/2* (VC+VD).
When the positive input terminal input voltage of error amplifier 401 is less than negative input end input voltage, electric capacity C31 discharges, when
When discharge voltage is less than 1/2* (VC+VD), the output second switch selection signal S2 of first comparator 501, second switch selection letter
Number S2 control selections switch 602,603 is closed so that the positive input terminal of the second comparator 502 connects the 4th reference voltage VD, negative
Input connects electric capacity C31, when discharge voltage is less than VD, produces one second pulse CK2, the second pulse CK2 to cause switch
403 conductings, the current potential of electric capacity C31 is haled to 1/2* (VC+VD).
Because the voltage difference that the corresponding electric capacity C31 of the first pulse CK1 charge is 1/2* (VC-VD), the second pulse CK2 pairs
The voltage difference of the electric capacity C31 electric discharges answered also is 1/2* (VC-VD), that is, the difference for changing is identical, if then in an exchange half
Week, the first pulse CK1 and the second pulse CK2 count values are identical, have meant that electric capacity C31 charging and dischargings are identicals, thus
Understand that the positive input terminal of error amplifier is identical with negative input end voltage, namely the effect for realizing error amplifier.Wherein, institute
State the first pulse CK1, the second pulse CK2 effect it is identical with Fig. 2, Fig. 4, here is omitted.
From the first pulse CK1 and the generation process of the second pulse CK2, the first pulse CK1 and the second pulse CK2 can be with
(the same pulse signal exported by the 3rd pulse generating circuit 503 obtains the first pulse CK1 and to be merged into same signal
Two pulse CK2), and the counting direction of forward-backward counter is directly determined by first switch selection signal S1, it is identical in effect.
Fourth embodiment
The present embodiment provides a kind of drive circuit, including error amplification device 701, and the error amplification device 701 can be with
Realized using the structure described by any of the above-described embodiment.
Specifically as shown in fig. 7, the drive circuit mainly includes：It is AC input rectification circuit 101, input AC source 102, defeated
Enter electric capacity Cin, inductance L1, power switch M1, sampling resistor Rs, sustained diode 1, output capacitance Cbulk, output current to adopt
Sample circuit 208, error amplification device 701, pwm signal generation circuit 113.
Wherein, AC input rectification circuit 101 receives the AC-input voltage of input AC source 102 and to its rectification；Input
One end connection input voltage incoming end Vin of electric capacity Cin, its other end ground connection；The source connection input voltage of power switch M1
Incoming end Vin, one end of its drain terminal connection sampling resistor Rs, its grid end receives the drive signal of pwm signal generation circuit 113；
One end of inductance L1 connects the other end of sampling resistor Rs, one end of the other end connection output capacitance Cbulk of inductance L1；Afterflow
One end of the negative electrode connection sampling resistor Rs of diode D1, the other end of its anode connection output capacitance Cbulk；Output capacitance
Cbulk is in parallel with load, such as in parallel with LED load；Sampling resistor Rs sampled output currents, are switched with driving power
M1；The input of the error amplification device 701 connects the output current sample circuit 208, and its output end connects the PWM
Signal generating circuit 113.The loop control signal control pwm signal of the output of the forward-backward counter 205, and then control ring
Road, the loop is the loop of the drive circuit.
It should be noted that the utility model reduces compensating electric capacity in being not only used in Closed-loop Constant-current control circuit,
Can also be used in closed loop constant-voltage control circuit and reduce compensating electric capacity, and be used in closed loop constant-power control circuit and reduce compensation
Electric capacity, is capable of achieving that compensating electric capacity is built into the purpose of chip internal, with the reliability for simplifying periphery circuit, improving circuit.
The utility model error amplification device circuit structure can be used in various power supply topologies, include without limit
In buck configuration, boost configuration, Flyback configuration, lifting laminated structure etc., when using, directly error of the present utility model is amplified
Device structure replaces the error amplifier structure of original circuit, therefore no longer illustrates one by one herein.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For system disclosed in embodiment
For, due to corresponding to the method disclosed in Example, so description is fairly simple, related part is referring to method part illustration
.
Foregoing description is only the description to the utility model preferred embodiment, not to any limit of the utility model scope
Calmly, the those of ordinary skill in the utility model field does according to the disclosure above content any change, modification, belonging to right will
Seek the protection domain of book.
Claims (21)
1. a kind of error amplification device, it is characterised in that including：
Error amplifier block；
Pulse generating circuit, connects the error amplifier block, and produce according to the output voltage of the error amplifier block
Raw first pulse and the second pulse；
Forward-backward counter, it is a preset value that the forward-backward counter counts digit, connects the pulse generating circuit, and right
First pulse and the second pulse carry out plus-minus counting, and output one reflects the loop control signal of offset voltage size, the loop
Control signal directly controls a pwm signal, or, the loop control signal goes to control a PWM again after being converted into analog signal
Signal.
2. error amplification device as claimed in claim 1, it is characterised in that in a Part I for exchanging half cycle, it is described
The count value of forward-backward counter increases；In a Part II for exchanging half cycle, the count value of the forward-backward counter subtracts
It is small；Exchanged in half cycle at one, plus coujnt is equal to subtraction count.
3. error amplification device as claimed in claim 1, it is characterised in that the pulse generating circuit includes producing the first arteries and veins
Second pulse generating circuit of second pulse of the first pulse generating circuit and generation of punching.
4. error amplification device as claimed in claim 3, it is characterised in that the error amplifier block includes：First determines
When current generating circuit, the first electric capacity, first switch, first comparator, the second timing circuit produce circuit, the second electric capacity, the
Two switches and the second comparator；
The positive input terminal of the first comparator connects first timing circuit and produces circuit, one end of the first electric capacity and first
The source of switch, the negative input end of the first comparator connects one first reference voltage, the output end of the first comparator
Connect the input of first pulse generating circuit；
The output end of first pulse generating circuit and the grid end of first switch connect an input of the forward-backward counter
End, the other end of first electric capacity is grounded with the drain terminal of the first switch；
The positive input terminal of second comparator connects second timing circuit and produces circuit, one end of the second electric capacity and second
The source of switch, the negative input end of second comparator connects one second reference voltage, the output end of second comparator
Connect the input of second pulse generating circuit；
The output end of second pulse generating circuit and the grid end of second switch connect the another defeated of the forward-backward counter
Enter end, the other end of second electric capacity is grounded with the drain terminal of the second switch.
5. error amplification device as claimed in claim 4, it is characterised in that first timing circuit produces circuit in a base
First electric capacity is charged under the control of quasi- voltage, charging voltage when reaching first reference voltage first comparator turn over
Turn, first pulse generating circuit produces first pulse, first switch conducting described in first Pulse Width Control；It is described
Second timing circuit produces circuit to be charged to second electric capacity under output current sampled signal control, and charging voltage reaches
Second comparator upset described in during second reference voltage, second pulse generating circuit produces second pulse, institute
State second switch conducting described in the second Pulse Width Control.
6. error amplification device as claimed in claim 5, it is characterised in that circuit is produced according to first timing circuit
Current value, the second electric capacity, the second reference voltage, the first electric capacity, the numerical value of the first reference voltage obtain second timing circuit
Produce the average value of circuit.
7. error amplification device as claimed in claim 3, it is characterised in that the error amplifier block includes：Error is put
Big device, electric capacity, first switch, first comparator, second switch and the second comparator；
The positive input terminal of the error amplifier connects a reference voltage, and the negative input end connection one of the error amplifier is exported
Current sampling signal, the output end of the error amplifier connects the positive input terminal and the second comparator of the first comparator
Positive input terminal；
The negative input end of the first comparator connects one the 3rd reference voltage, and the output end connection of the first comparator is described
The input of the first pulse generating circuit；
The output end of first pulse generating circuit connects an input of the forward-backward counter, the first pulse hair
The break-make of first switch described in first Pulse Width Control of raw circuit output；
The negative input end of second comparator connects one the 4th reference voltage, and the output end connection of second comparator is described
The input of the second pulse generating circuit；
The output end of second pulse generating circuit connects another input of the forward-backward counter, second pulse
There is the break-make of second switch described in the second Pulse Width Control of circuit output；
Described electric capacity one end connects the output end of the error amplifier, other end ground connection.
8. error amplification device as claimed in claim 7, it is characterised in that the positive input terminal input electricity of the error amplifier
When pressure is more than negative input end input voltage, the electric capacity is charged, and one first is produced when charging voltage is more than three reference voltages
Pulse, the first pulse causes that first switch is turned on, and the current potential of electric capacity is haled to 1/2* (the 3rd reference voltage the+the four reference electricity
Pressure)；When the positive input terminal input voltage of the error amplifier is less than negative input end input voltage, the electric capacity electric discharge, electric discharge
Voltage produces second pulse, the second pulse to cause that second switch is turned on when being less than four reference voltages, the current potential quilt of electric capacity
Hale 1/2* (the 3rd the+the four reference voltage of reference voltage).
9. error amplification device as claimed in claim 8, it is characterised in that the electricity that the corresponding electric capacity of first pulse charges
Pressure difference is 1/2* (the 3rd the-the four reference voltage of reference voltage), the voltage difference of the corresponding electric capacity electric discharge of second pulse
Also it is 1/2* (the 3rd the-the four reference voltage of reference voltage), the first pulse and the second counted number of pulses in half cycle is exchanged at one
Represent that electric capacity charging and discharging is identical when identical.
10. error amplification device as claimed in claim 9, it is characterised in that the error amplifier is put for transconductance type error
Big device.
11. error amplification devices as claimed in claim 1, it is characterised in that the pulse generating circuit includes one the 3rd arteries and veins
There is circuit in punching, the pulse signal exported by the 3rd pulse generating circuit obtains first pulse and the second pulse.
12. error amplification devices as claimed in claim 11, it is characterised in that the error amplifier block includes：Error
Amplifier, electric capacity, switch, first comparator, the second comparator, four selecting switch and phase inverter；
The positive input terminal of the error amplifier connects a reference voltage, and the negative input end connection one of the error amplifier is exported
Current sampling signal；
The positive input terminal of the first comparator connects the 5th reference voltage, and the negative input end connection of the first comparator is described
The output end of error amplifier, the output end of the first comparator connects the input of the 3rd pulse generating circuit and anti-
Phase device, the 5th reference voltage is 1/2* (the 3rd the+the four reference voltage of reference voltage)；
The positive input terminal of second comparator by four selecting switch connect the electric capacity with the 3rd reference voltage
Or the 4th reference voltage, the output end of second comparator connects the input of the 3rd pulse generating circuit；
The output end of the 3rd pulse generating circuit connects the input of the forward-backward counter, the 3rd pulse generation
Switched on-off described in the pulse signal control of circuit output.
13. error amplification devices as claimed in claim 12, it is characterised in that the positive input terminal input of the error amplifier
When voltage is more than negative input end input voltage, the electric capacity charges, and charging voltage more than 1/2*, (join by the 3rd reference voltage+the four
Examine voltage) when, the first comparator exports first switch selection signal, and the positive input terminal of the comparator connects the electricity
Hold, negative input end connects the 3rd reference voltage, while first switch selection signal controls the 3rd pulse generating circuit, charging voltage
First pulse, first pulse is produced to cause switch conduction, the current potential quilt of the electric capacity during more than three reference voltages
Hale 1/2* (the 3rd the+the four reference voltage of reference voltage)；The positive input terminal input voltage of the error amplifier is less than negative
During input input voltage, the electric capacity electric discharge, when discharge voltage is less than 1/2* (the 3rd the+the four reference voltage of reference voltage),
The first comparator output second switch selection signal, the 4th reference voltage of positive input terminal connection of second comparator,
Negative input end connects the electric capacity, and discharge voltage produces second pulse, second pulse when being less than four reference voltages
So that switch conduction, the current potential of the electric capacity is haled to 1/2* (the 3rd the+the four reference voltage of reference voltage).
14. error amplification devices as claimed in claim 12, it is characterised in that the corresponding electric capacity of first pulse charges
Voltage difference is 1/2* (the 3rd the-the four reference voltage of reference voltage), the voltage difference of the corresponding electric capacity electric discharge of second pulse
Value is also 1/2* (the 3rd the-the four reference voltage of reference voltage), and the first pulse and the second step-by-step counting in half cycle are exchanged at one
The identical expression electric capacity charging and discharging of value is identical.
15. error amplification device as any one of claim 1 to 14, it is characterised in that the forward-backward counter
Use trigger structure.
16. error amplification device as any one of claim 1 to 14, it is characterised in that the forward-backward counter
It is decimal add subtraction count device.
17. error amplification device as any one of claim 1 to 14, it is characterised in that the forward-backward counter
Counting digit be 10 or 15.
18. error amplification device as any one of claim 1 to 14, it is characterised in that the error amplification device
It is used in Closed-loop Constant-current control circuit, closed loop constant-voltage control circuit or closed loop constant-power control circuit.
19. error amplification device as any one of claim 1 to 14, it is characterised in that the error amplification device
It is used in buck configuration, boost configuration, Flyback configuration or lifting laminated structure.
20. a kind of drive circuits, it is characterised in that amplify dress including the error as described in any one in claim 1 to 19
Put.
21. drive circuits as claimed in claim 20, it is characterised in that also include：Output current sample circuit and pwm signal
Produce circuit；The input of the error amplifier connects the output current sample circuit, the output of the error amplifier
The end connection pwm signal generation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621349917.3U CN206226795U (en) | 2016-12-09 | 2016-12-09 | Error amplification device and the drive circuit comprising the error amplification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621349917.3U CN206226795U (en) | 2016-12-09 | 2016-12-09 | Error amplification device and the drive circuit comprising the error amplification device |
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| Publication Number | Publication Date |
|---|---|
| CN206226795U true CN206226795U (en) | 2017-06-06 |
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ID=58785596
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621349917.3U Active CN206226795U (en) | 2016-12-09 | 2016-12-09 | Error amplification device and the drive circuit comprising the error amplification device |
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| Country | Link |
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| CN (1) | CN206226795U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108063601A (en) * | 2017-12-29 | 2018-05-22 | 上海艾为电子技术股份有限公司 | A kind of automatic gain control circuit and signal processing system |
| CN113595385A (en) * | 2020-04-30 | 2021-11-02 | 圣邦微电子（北京）股份有限公司 | Circuit for improving transient response speed in DCDC |
-
2016
- 2016-12-09 CN CN201621349917.3U patent/CN206226795U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108063601A (en) * | 2017-12-29 | 2018-05-22 | 上海艾为电子技术股份有限公司 | A kind of automatic gain control circuit and signal processing system |
| CN113595385A (en) * | 2020-04-30 | 2021-11-02 | 圣邦微电子（北京）股份有限公司 | Circuit for improving transient response speed in DCDC |
| CN113595385B (en) * | 2020-04-30 | 2023-04-11 | 圣邦微电子（北京）股份有限公司 | Circuit for improving transient response speed in DCDC |
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