CN103259427B - A kind of High-power-factor constant current control circuit with open-circuit-protection - Google Patents
A kind of High-power-factor constant current control circuit with open-circuit-protection Download PDFInfo
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- CN103259427B CN103259427B CN201310203866.8A CN201310203866A CN103259427B CN 103259427 B CN103259427 B CN 103259427B CN 201310203866 A CN201310203866 A CN 201310203866A CN 103259427 B CN103259427 B CN 103259427B
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Abstract
The invention belongs to technical field of constant current drive, provide a kind of High-power-factor constant current control circuit with open circuit protecting function.This circuit is in constant-current driven chip, increase by an open-circuit-protection control circuit; this open-circuit-protection control circuit is when there is open circuit in load; output open circuit detection signal is to pulse signal generative circuit; pulse signal generative circuit is according to this open circuit detection signal; driving switch circuit shut-down, to reach the object of open-circuit-protection.Relative to the open-circuit-protection implementation of existing active power factor corrector, owing to avoiding using the auxiliary winding of transformer, divider resistance or clamper tube, thus make that this circuit volume area that is little, that take plate face is little, cost is low and reliability is high.
Description
Technical field
The invention belongs to technical field of constant current drive, particularly relate to a kind of High-power-factor constant current control circuit with open circuit protecting function.
Background technology
Obtaining alternating current from electrical network and power for load equipment after rectification is a kind of conventional unsteady flow scheme.If but the power factor of the load equipment of incoming transport electrical network is on the low side, then can cause harmonic pollution to a certain degree to utility network.
In technical field of constant current drive, in order to while meeting constant current driving, meet the High Power Factor requirement of load equipment, be currently suggested the implementation of the following two kinds constant current Drive and Control Circuit:
One, on traditional power-switching circuit basis, corresponding passive power factor correcting circuit is increased, to meet the requirement of constant current driving and High Power Factor.Under this kind of mode, because passive power factor correcting circuit need adopt high-voltage electrolytic capacitor, the cost of constant current Drive and Control Circuit is increased and the lost of life.
Two, active power factor corrector is added.Specifically between rectifier and load, access switch converters, applied current feedback technique, make the waveform tracking of input electric current exchange the sinusoidal voltage waveform of input, make input electric current close to sinusoidal wave, thus the power factor of input is improved.
In prior art, the mode that active power factor corrector realizes open-circuit-protection mainly contains following two kinds:
One, by adopting the mode of transformer auxiliary winding feedback, the voltage of the feedback end of drived control chip is proportional with the output voltage of Switching Power Supply, and when the output of Switching Power Supply is opened a way, the voltage of the feedback end of drived control chip also correspondingly raises.When the voltage of feedback end reaches certain value, the overvoltage crowbar startup work of drived control chip internal is to play a protective role.But, detection signal is provided due to the feedback pin that the auxiliary winding of transformer and two divider resistances are driving governor need be utilized, make the peripheral circuit device of constant current driving governor more, cost is higher and area occupied is larger, simultaneously because feedback pin exposes, make driving governor be easy to be subject to external disturbance, reduce the reliability of drive circuit.
Two, Switching Power Supply output and connect clamper tube, the rising of output voltage when opening a way with limit switch power supply, but need to use the larger clamper tube of power ratio to carry out clamper, cost raises and output open circuit power is very large, reduces reliability.
In sum; in prior art; the open-circuit-protection implementation of active power factor corrector or adopt the mode of transformer auxiliary winding feedback and cost is high, area occupied large and poor reliability, or Switching Power Supply output and connect clamper tube and the high and poor reliability of cost.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of High-power-factor constant current control circuit with open-circuit-protection; be intended to solve the open-circuit-protection implementation of existing active power factor corrector or adopt the mode of transformer auxiliary winding feedback and cost is high, area occupied large and poor reliability, or Switching Power Supply output and connect clamper tube and the high and problem of poor reliability of cost.
The embodiment of the present invention realizes like this; a kind of High-power-factor constant current control circuit with open-circuit-protection; the described High-power-factor constant current control circuit with open-circuit-protection comprises carries out rectification and the rectifier circuit exported and constant-current driven chip to electric main, and described constant-current driven chip comprises:
Switching circuit, for controlled by off operating mode output from described rectifier circuit to load whether;
Pulse signal generative circuit, for generating the modulation signal of the on off operating mode controlling described switching circuit;
ON time control circuit, for when the ON time of described switching circuit reaches very first time preset value, exports to described pulse signal generative circuit and turns off control signal, turns off to control described switching circuit;
Turn-off time control circuit, for when the turn-off time of described switching circuit reaches the second time preset value, exports conductivity control signal, to control described switching circuit conducting to described pulse signal generative circuit;
Error amplifying circuit, exports to described ON time control circuit after the voltage of the voltage of described switching circuitry output and the 3rd reference voltage source is carried out error amplification;
Open-circuit-protection control circuit, for when open circuit appears in load, to described pulse signal generative circuit output open circuit detection signal, turns off to drive described switching circuit.
The High-power-factor constant current control circuit with open-circuit-protection that the embodiment of the present invention proposes is in constant-current driven chip, increase by an open-circuit-protection control circuit; this open-circuit-protection control circuit is when there is open circuit in load; output open circuit detection signal is to pulse signal generative circuit; pulse signal generative circuit is according to this open circuit detection signal; driving switch circuit shut-down, to reach the object of open-circuit-protection.Relative to the open-circuit-protection implementation of existing active power factor corrector, owing to avoiding using the auxiliary winding of transformer, divider resistance or clamper tube, thus make that this circuit volume area that is little, that take plate face is little, cost is low and reliability is high.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams with the High-power-factor constant current control circuit of open-circuit-protection that the embodiment of the present invention provides;
Fig. 2 is the circuit diagram of Fig. 1.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
For prior art Problems existing; the embodiment of the present invention proposes a kind of High-power-factor constant current control circuit with open-circuit-protection; this circuit increases by an open-circuit-protection control circuit in constant-current driven chip; this open-circuit-protection control circuit is when there is open circuit in load; output open circuit detection signal is to pulse signal generative circuit; pulse signal generative circuit according to this open circuit detection signal, driving switch circuit shut-down.
Fig. 1 shows the circuit theory with the High-power-factor constant current control circuit of open-circuit-protection that the embodiment of the present invention provides, and for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention.
Specifically, the High-power-factor constant current control circuit with open-circuit-protection that the embodiment of the present invention provides comprises carries out rectification and the rectifier circuit 2, constant-current driven chip 1, resistance R1, electric capacity C1, electric capacity C2, diode D1, the inductance L 1 that export to electric main Vac.
Wherein, electric capacity C1 is connected in parallel on the two ends after resistance R1 and load in series, and second end of the first end contact resistance R1 of electric capacity C1, electric capacity C1 connects load, and second end of electric capacity C1 is by inductance L 1 ground connection.
Wherein, constant-current driven chip 1 comprises: switching circuit 11, and the input of switching circuit 11 connects the output of rectifier circuit 2, and the output of switching circuit 11 connects the first end of electric capacity C1 and the negative electrode of diode D1, the plus earth of diode D1; The pulse signal generative circuit 12 of connecting valve circuit 11; The error amplifying circuit 13 of the output of connecting valve circuit 11; Connect the ON time control circuit 14 of pulse signal generative circuit 12 and error amplifying circuit 13, and the output of the input of the first end of electric capacity C2 and ON time control circuit 14 and error amplifying circuit 13 connects altogether, second end of electric capacity C2 connects equipotential signal ground; Connect the turn-off time control circuit 15 of pulse signal generative circuit 12; The output of connecting valve circuit 11 and the open-circuit-protection control circuit 16 of pulse signal generative circuit 12; One end equipotential signal ground that pulse signal generative circuit 12, error amplifying circuit 13, ON time control circuit 14, turn-off time control circuit 15, open-circuit-protection control circuit 16, resistance R1 are connected with load; The power end of pulse signal generative circuit 12, error amplifying circuit 13, ON time control circuit 14, turn-off time control circuit 15, open-circuit-protection control circuit 16 connects direct current VCC jointly.
In the embodiment of the present invention, switching circuit 11 for controlled by off operating mode output from rectifier circuit 2 to load whether, when switching circuit 11 is in conducting state, rectifier circuit 2 exports electric energy to load, when switching circuit 11 is in off state, rectifier circuit 2 does not export electric energy to load, and afterflow is carried out in inductance L 1 pair of load; Pulse signal generative circuit 12 is for generating the modulation signal of control switch circuit 11 on off operating mode; Error amplifying circuit 13, for after the voltage of the voltage of switching circuit 11 output and the 3rd reference voltage source is carried out error amplification, exports to ON time control circuit 14; ON time control circuit 14, for when the ON time of switching circuit 11 reaches very first time preset value, exports to pulse signal generative circuit 12 and turns off control signal, turn off with control switch circuit 11; Turn-off time control circuit 15, for when the turn-off time of switching circuit 11 reaches the second time preset value, exports conductivity control signal to pulse signal generative circuit 12, with control switch circuit 11 conducting; Open-circuit-protection control circuit 16, for when open circuit appears in load, to pulse signal generative circuit 12 output open circuit detection signal, with driving switch circuit shut-down, thus realizes the object of open-circuit-protection.
The above-mentioned High-power-factor constant current control circuit with open-circuit-protection that below the explanation embodiment of the present invention provides realizes the principle that constant current drives: as seen from Figure 1; the size of current flowing through output is equal with the size of current flowing through resistance R1, direction is identical, therefore only need ensure that the magnitude of voltage on resistance R1 remains unchanged can realize constant current output at the mean value of an ac cycle.According to the principle of error amplifier, at steady state, the mean value of error amplifier two inputs is equal, suppose that the voltage of the 3rd reference voltage source is Vref3, resistance R1 is connected one end instantaneous voltage with electric capacity C1 is Vcs, and grid cycle is Tgrid, then have:
If suppose, the resistance of resistance R1 is Rcs, then the electric current I o flowing through output can be expressed as:
Because the voltage Vref3 of the 3rd reference voltage source and the resistance Rcs of resistance R1 is fixed value, therefore, the electric current I o flowing through output is fixed value, achieves constant current output.
Below illustrate that the above-mentioned High-power-factor constant current control circuit with open-circuit-protection that the embodiment of the present invention provides realizes high-power principle: as shown in Figure 1, error amplifying circuit 13 and electric capacity C2 form an average current ring, because average current ring has switch periods average value filtering effect, therefore, after the negative terminal input signal of error amplifying circuit 13 is filtering switch periods ripple, the mean value of voltage on resistance R1, the voltage of this mean value and the 3rd reference voltage source compares, therebetween error is after average current ring amplifies, it is one superposed the low-frequency ripple of twice AC network frequency and the DC level of high frequency switching ripple that average current ring exports.ON time control circuit 14 modulates a corresponding ON time Ton as very first time preset value according to the DC level that average current ring exports, when the conducting duration of switching circuit 11 reaches Ton, ON time control circuit 14 produces a shutoff control signal and carrys out shutdown switch circuit 11, the the second time preset value set according to turn-off time control circuit 15 afterwards produces a conductivity control signal and carrys out actuating switch circuit 11, so repeatedly, the break-make that a switch modulation signal carrys out control switch circuit 11 is formed.Be fixed value by setting the second time preset value Toff, select suitable inductance L 1, make system works under discontinuous operating mode, suppose that the instantaneous value of the voltage that rectifier circuit 2 exports is Uin (t), it is half-sinusoid signal, output voltage is Vout, and the peak current that each switch periods flows through inductance L 1 is Ip (t), and the volt-second characteristic according to discontinuous operating mode has:
（Uin(t)-Vout）×Ton=L1×Ip(t) （3）
Hypothesis flows through the mean value of electric current in each switch periods of switching circuit 11 is again Im (t), and duty ratio is D, and switch periods is T, then, under discontinuous mode, the size of input average current is:
Im(t)=1/2×Ip(t)×D=1/2×Ip(t)×Ton/T （4）
Convolution (3) and formula (4) known:
Im(t)=1/2×Ip(t)×D=1/2×（Ton×Ton/L1/T）×（Uin(t)-Vout） （5）
From formula (5), because Ton, T and L1 are fixed amounts, the mean value therefore flowing through switching circuit 11 is a same frequency in-phase signal differing a fixed amount with Uin (t), thus achieves High Power Factor.
Fig. 2 shows the circuit of Fig. 1.
Particularly, switching circuit 11 can comprise: the drain electrode of the metal-oxide-semiconductor Q1 of N-type, metal-oxide-semiconductor Q1 is as the input of switching circuit 11, and the source electrode of metal-oxide-semiconductor Q1 is as the output of switching circuit 11, and the grid of metal-oxide-semiconductor Q1 connects pulse signal generative circuit 12.
Particularly, pulse signal generative circuit 12 can comprise: the metal-oxide-semiconductor Q6 of N-type, the metal-oxide-semiconductor Q7 of N-type, inverter U9, inverter U6, rest-set flip-flop U8, NOR gate U7.Wherein, the drain electrode of metal-oxide-semiconductor Q6 connects direct current VCC, and the source electrode of metal-oxide-semiconductor Q6 connects the drain electrode of metal-oxide-semiconductor Q7 and connecting valve circuit 11, and the source electrode of metal-oxide-semiconductor Q7 connects equipotential signal ground; The grid of metal-oxide-semiconductor Q7 connects the output of inverter U9, and the input of inverter U9 connects the grid of metal-oxide-semiconductor Q6, and connects the same-phase output pin Q of rest-set flip-flop U8; The same-phase output pin Q of rest-set flip-flop U8 connects turn-off time control circuit 15 and ON time control circuit 14 simultaneously; The S pin of rest-set flip-flop U8 connects turn-off time control circuit 15; The R pin of rest-set flip-flop U8 connects the output of NOR gate U7; the first input end of NOR gate U7 connects open-circuit-protection control circuit 16; second input of NOR gate U7 connects the output of inverter U6, and the input of inverter U6 connects ON time control circuit 14.
Particularly, error amplifying circuit 13 can comprise: error amplifier U3 and the 3rd reference voltage source 131.Wherein, the 3rd reference voltage source 131 connects the positive input terminal of error amplifier U3, and the negative input end of error amplifier U3 connects the first end of electric capacity C1, and the output of error amplifier U3 connects the first end of ON time control circuit and electric capacity C2.
Particularly, ON time control circuit 14 can comprise: metal-oxide-semiconductor Q4, the electric capacity C4 of metal-oxide-semiconductor Q5, P type of comparator U5, the first current source A1, inverter U4, N-type.Wherein, the input of inverter U4 connects pulse signal generative circuit 12, specifically connects the same-phase output pin Q of rest-set flip-flop U8 in pulse signal generative circuit 12, and the output of inverter U4 connects the grid of metal-oxide-semiconductor Q5; The source electrode of metal-oxide-semiconductor Q5 is connected equipotential signal ground jointly with the first end of electric capacity C4, and the drain electrode of metal-oxide-semiconductor Q5 connects second end of electric capacity C4, the negative input end of comparator U5 and the drain electrode of metal-oxide-semiconductor Q4, and the source electrode of metal-oxide-semiconductor Q4 connects the output of the first current source A1; The positive input terminal of comparator U5 connects error amplifying circuit 13, and the output of comparator U5 connects pulse signal generative circuit 12, connects the input of inverter U6 specifically.
Particularly, turn-off time control circuit 15 can comprise: metal-oxide-semiconductor Q8, the electric capacity C5 of metal-oxide-semiconductor Q9, P type of comparator U2, the second reference voltage source 151, the 3rd current source A3, N-type.Wherein, the grid of metal-oxide-semiconductor Q9 connects pulse signal generative circuit 12, specifically connect the same-phase output pin Q of rest-set flip-flop U8 in pulse signal generative circuit 12, the source electrode of metal-oxide-semiconductor Q9 is connected equipotential signal ground jointly with the first end of electric capacity C5, and the drain electrode of metal-oxide-semiconductor Q9 connects second end of electric capacity C5, the negative input end of comparator U2 and the drain electrode of metal-oxide-semiconductor Q8; The source electrode of metal-oxide-semiconductor Q8 connects the output of the 3rd current source A3, and the grid of metal-oxide-semiconductor Q8 connects the grid of metal-oxide-semiconductor Q9; The positive input terminal of comparator U2 connects the second reference voltage source 151, and the output of comparator U2 connects pulse signal generative circuit 12, specifically connects the S pin of rest-set flip-flop U8.
Particularly, open-circuit-protection control circuit 16 can comprise: the metal-oxide-semiconductor Q2 of metal-oxide-semiconductor Q3, P type of comparator U1, the first reference voltage source 161, second current source A2, electric capacity C3, N-type.Wherein, the positive input terminal of comparator U1 connects the first end of electric capacity C1, and the negative input end of comparator U1 connects the first reference voltage source 161, and the output of comparator U1 connects the grid of metal-oxide-semiconductor Q2 and the grid of metal-oxide-semiconductor Q3; The source electrode of metal-oxide-semiconductor Q2 connects the output of the second current source A2, and the drain electrode of metal-oxide-semiconductor Q2 connects the drain electrode of metal-oxide-semiconductor Q3 and the first end of electric capacity C3, and the source electrode of metal-oxide-semiconductor Q3 is connected equipotential signal ground jointly with second end of electric capacity C3.
Below describe the operation principle of circuit shown in Fig. 2 in detail:
First, when the same-phase output pin Q of rest-set flip-flop U8 exports as high level, metal-oxide-semiconductor Q1 conducting, comparator U1 exports high level, metal-oxide-semiconductor Q3 conducting and metal-oxide-semiconductor Q2 ends, and the first input end of NOR gate U7 is low level, simultaneously, the high level that the same-phase output pin Q of rest-set flip-flop U8 exports feeds back to inverter U4, inverter U4 exports as low level, make metal-oxide-semiconductor Q4 conducting and metal-oxide-semiconductor Q5 ends, first current source A1 charges to electric capacity C4, and when the voltage of second end of electric capacity C4 is less than the DC level Vcomp of error amplifying circuit 13 output, comparator U5 exports high level, second input of NOR gate U7 is made to be low level, because the first input end of now NOR gate U7 is low level, therefore the output of NOR gate U7 is high level, namely the R pin of rest-set flip-flop U8 is high level, simultaneously, the high level of the same-phase output pin Q output of rest-set flip-flop U8 feeds back to the grid of metal-oxide-semiconductor Q9, make metal-oxide-semiconductor Q9 conducting and metal-oxide-semiconductor Q8 ends, the negative input end of comparator U2 is low level, the output of comparator U2 is high level, and namely the S pin of rest-set flip-flop U8 is high level, because the R pin of now rest-set flip-flop U8 is also high level, therefore the same-phase output pin Q of rest-set flip-flop U8 keeps current high level output, to maintain the conducting of metal-oxide-semiconductor Q1.
Afterwards, along with the charging voltage of second end of electric capacity C4 constantly increases, when it is greater than the DC level Vcomp of error amplifying circuit 13 output, comparator U5 output low level, the the second input saltus step making NOR gate U7 is high level, and then the R pin saltus step making rest-set flip-flop U8 is low level, because the S pin of now rest-set flip-flop U8 is high level, therefore the same-phase output pin Q saltus step of rest-set flip-flop U8 is low level, make metal-oxide-semiconductor Q7 conducting and metal-oxide-semiconductor Q6 ends, and then turn off metal-oxide-semiconductor Q1.
Afterwards, at metal-oxide-semiconductor Q1 blocking interval, due to the effect of electric capacity C1, the voltage of the positive input terminal of comparator U1 is greater than the first reference voltage source 161 all the time, makes the first input end of NOR gate U7 be always low level, simultaneously, the low level of the same-phase output pin Q output of rest-set flip-flop U8 feeds back to the input of inverter U4, the output of inverter U4 is made to be high level, metal-oxide-semiconductor Q5 conducting and metal-oxide-semiconductor Q4 ends, and then make the output of comparator U5 be high level, second input of NOR gate U7 is low level, and now the first input end of NOR gate U7 is also low level, therefore the output of NOR gate U7 is high level, namely the R pin of rest-set flip-flop U8 is high level, because the S pin of now rest-set flip-flop U8 is high level, therefore the same-phase output pin Q of rest-set flip-flop U8 keeps current low level output, to maintain the shutoff of metal-oxide-semiconductor Q1, simultaneously, the low level of the same-phase output pin Q output of rest-set flip-flop U8 feeds back to the grid of metal-oxide-semiconductor Q9, metal-oxide-semiconductor Q9 is ended and metal-oxide-semiconductor Q8 conducting, electric capacity C5 starts charging, when the voltage of second end of electric capacity C5 is greater than the second reference voltage source 151, comparator U2 output low level, namely the S pin of rest-set flip-flop U8 is low level, and now the R pin of rest-set flip-flop U8 is high level, therefore the same-phase output pin Q of rest-set flip-flop U8 exports high level, metal-oxide-semiconductor Q1 is made to recover conducting, so repeatedly, the break-make realizing switching circuit controls, turn-off time control circuit 15 sets the fixing turn-off time, by selecting suitable inductance L 1, make system works under discontinuous mode.
If there is load open circuit in circuit working process; the then voltage Vcs of the first end of electric capacity C1 and the same current potential of equipotential signal ground; the output of comparator U1 is made to be low level by high level saltus step; make metal-oxide-semiconductor Q2 conducting and metal-oxide-semiconductor Q3 ends; second current source A2 charges to electric capacity C3; the first input end of NOR gate U7 is made to become high level; the R pin of rest-set flip-flop U8 is low level; therefore the same-phase output pin Q of rest-set flip-flop U8 becomes low level; thus turn off metal-oxide-semiconductor Q1, serve the effect of open-circuit-protection.
In sum; the High-power-factor constant current control circuit with open-circuit-protection that the embodiment of the present invention proposes is in constant-current driven chip, increase by an open-circuit-protection control circuit; this open-circuit-protection control circuit is when there is open circuit in load; output open circuit detection signal is to pulse signal generative circuit; pulse signal generative circuit is according to this open circuit detection signal; driving switch circuit shut-down, to reach the object of open-circuit-protection.Relative to the open-circuit-protection implementation of existing active power factor corrector, owing to avoiding using the auxiliary winding of transformer, divider resistance or clamper tube, thus make that this circuit volume area that is little, that take plate face is little, cost is low and reliability is high.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. one kind has the High-power-factor constant current control circuit of open-circuit-protection; it is characterized in that; the described High-power-factor constant current control circuit with open-circuit-protection comprises carries out rectification and the rectifier circuit exported and constant-current driven chip to electric main, and described constant-current driven chip comprises:
Switching circuit, for controlled by off operating mode output from described rectifier circuit to load whether;
Pulse signal generative circuit, for generating the modulation signal of the on off operating mode controlling described switching circuit;
ON time control circuit, for when the ON time of described switching circuit reaches very first time preset value, exports to described pulse signal generative circuit and turns off control signal, turns off to control described switching circuit;
Turn-off time control circuit, for when the turn-off time of described switching circuit reaches the second time preset value, exports conductivity control signal, to control described switching circuit conducting to described pulse signal generative circuit;
Error amplifying circuit, exports to described ON time control circuit after the voltage of the voltage of described switching circuitry output and the 3rd reference voltage source is carried out error amplification;
Open-circuit-protection control circuit, for when open circuit appears in load, to described pulse signal generative circuit output open circuit detection signal, turns off to drive described switching circuit;
Described open-circuit-protection control circuit comprises: the metal-oxide-semiconductor Q2 of metal-oxide-semiconductor Q3, P type of comparator U1, the first reference voltage source, the second current source, electric capacity C3, N-type;
The positive input terminal of described comparator U1 connects the output of described switching circuit, and the negative input end of described comparator U1 connects described first reference voltage source, and the output of described comparator U1 connects the grid of described metal-oxide-semiconductor Q2 and the grid of described metal-oxide-semiconductor Q3; The source electrode of described metal-oxide-semiconductor Q2 connects the output of described second current source, the drain electrode of described metal-oxide-semiconductor Q2 connects the drain electrode of described metal-oxide-semiconductor Q3 and the first end of described electric capacity C3, and the source electrode of described metal-oxide-semiconductor Q3 is connected equipotential signal ground jointly with second end of described electric capacity C3.
2. there is the High-power-factor constant current control circuit of open-circuit-protection as claimed in claim 1, it is characterized in that, described in there is open-circuit-protection High-power-factor constant current control circuit also comprise resistance R1, electric capacity C1, electric capacity C2, diode D1, inductance L 1;
Described electric capacity C1 is connected in parallel on the two ends after described resistance R1 and load in series, and the first end of described electric capacity C1 connects described resistance R1, and second end of described electric capacity C1 connects load, and second end of described electric capacity C1 is by described inductance L 1 ground connection;
The output of described switching circuit connects the first end of described electric capacity C1 and the negative electrode of described diode D1, the plus earth of described diode D1;
The input of the first end of described electric capacity C2 and the output of described error amplifying circuit and described ON time control circuit connects altogether, and second end of described electric capacity C2 connects equipotential signal ground.
3. have the High-power-factor constant current control circuit of open-circuit-protection as claimed in claim 2, it is characterized in that, described switching circuit comprises: the metal-oxide-semiconductor Q1 of N-type;
The drain electrode of described metal-oxide-semiconductor Q1 is as the input of described switching circuit, and the source electrode of described metal-oxide-semiconductor Q1 is as the output of described switching circuit, and the grid of described metal-oxide-semiconductor Q1 connects described pulse signal generative circuit.
4. there is the High-power-factor constant current control circuit of open-circuit-protection as claimed in claim 2, it is characterized in that, described pulse signal generative circuit comprises: the metal-oxide-semiconductor Q6 of N-type, the metal-oxide-semiconductor Q7 of N-type, inverter U9, inverter U6, rest-set flip-flop U8, NOR gate U7;
The drain electrode of described metal-oxide-semiconductor Q6 connects direct current, and the source electrode of described metal-oxide-semiconductor Q6 connects the drain electrode of described metal-oxide-semiconductor Q7 and connects described switching circuit, and the source electrode of described metal-oxide-semiconductor Q7 connects equipotential signal ground; The grid of described metal-oxide-semiconductor Q7 connects the output of described inverter U9, and the input of described inverter U9 connects the grid of described metal-oxide-semiconductor Q6, and connects the same-phase output pin of described rest-set flip-flop U8; The described same-phase output pin of described rest-set flip-flop U8 connects described turn-off time control circuit and described ON time control circuit simultaneously; The S pin of described rest-set flip-flop U8 connects described turn-off time control circuit; The R pin of described rest-set flip-flop U8 connects the output of described NOR gate U7; the first input end of described NOR gate U7 connects described open-circuit-protection control circuit; second input of described NOR gate U7 connects the output of described inverter U6, and the input of described inverter U6 connects described ON time control circuit.
5. there is the High-power-factor constant current control circuit of open-circuit-protection as claimed in claim 4, it is characterized in that, described ON time control circuit comprises: metal-oxide-semiconductor Q4, the electric capacity C4 of metal-oxide-semiconductor Q5, P type of comparator U5, the first current source, inverter U4, N-type;
The input of described inverter U4 connects the described same-phase output pin of described rest-set flip-flop U8, and the output of described inverter U4 connects the grid of described metal-oxide-semiconductor Q5; The source electrode of described metal-oxide-semiconductor Q5 is connected equipotential signal ground jointly with the first end of described electric capacity C4, the drain electrode of described metal-oxide-semiconductor Q5 connects the drain electrode of second end of described electric capacity C4, the negative input end of described comparator U5 and described metal-oxide-semiconductor Q4, and the source electrode of described metal-oxide-semiconductor Q4 connects the output of described first current source A1; The positive input terminal of described comparator U5 connects described error amplifying circuit, and the output of described comparator U5 connects the input of described inverter U6.
6. there is the High-power-factor constant current control circuit of open-circuit-protection as claimed in claim 4, it is characterized in that, described turn-off time control circuit comprises: metal-oxide-semiconductor Q8, the electric capacity C5 of metal-oxide-semiconductor Q9, P type of comparator U2, the second reference voltage source, the 3rd current source, N-type;
The grid of described metal-oxide-semiconductor Q9 connects the described same-phase output pin of described rest-set flip-flop U8, the source electrode of described metal-oxide-semiconductor Q9 is connected equipotential signal ground jointly with the first end of described electric capacity C5, and the drain electrode of described metal-oxide-semiconductor Q9 connects second end of described electric capacity C5, the negative input end of described comparator U2 and the drain electrode of described metal-oxide-semiconductor Q8; The source electrode of described metal-oxide-semiconductor Q8 connects the output of described 3rd current source, and the grid of described metal-oxide-semiconductor Q8 connects the grid of described metal-oxide-semiconductor Q9; The positive input terminal of described comparator U2 connects described second reference voltage source, and the output of described comparator U2 connects the S pin of described rest-set flip-flop U8.
7. have the High-power-factor constant current control circuit of open-circuit-protection as claimed in claim 2, it is characterized in that, described error amplifying circuit comprises: error amplifier U3 and the 3rd reference voltage source;
Described 3rd reference voltage source connects the positive input terminal of described error amplifier U3, the negative input end of described error amplifier U3 connects the first end of described electric capacity C1, the output of described error amplifier U3 as described error amplifying circuit output and connect the input of described ON time control circuit and the first end of described electric capacity C2.
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| CN201310203866.8A CN103259427B (en) | 2013-05-28 | 2013-05-28 | A kind of High-power-factor constant current control circuit with open-circuit-protection |
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| CN201310203866.8A CN103259427B (en) | 2013-05-28 | 2013-05-28 | A kind of High-power-factor constant current control circuit with open-circuit-protection |
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| CN103259427B true CN103259427B (en) | 2015-10-21 |
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| CN104640268B (en) * | 2013-11-07 | 2019-03-08 | 深圳市明微电子股份有限公司 | A kind of High-power-factor constant current control circuit and LED illumination device |
| TWI689158B (en) * | 2018-01-30 | 2020-03-21 | 通嘉科技股份有限公司 | Power controller and relevant control method capable of providing open-circuit protection |
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| CN102684517B (en) * | 2012-05-24 | 2014-08-06 | 深圳市明微电子股份有限公司 | Switch power supply with high power factor and controller of switch power supply |
| CN102969915B (en) * | 2012-11-19 | 2016-03-02 | 深圳市明微电子股份有限公司 | A kind of High-power-factor constant current control circuit |
| CN102958258B (en) * | 2012-11-19 | 2014-07-30 | 深圳市明微电子股份有限公司 | High power factor constant current driving circuit |
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