CN103647444B - Two voltage-reduction high-power-factor constant current circuit and device - Google Patents
Two voltage-reduction high-power-factor constant current circuit and device Download PDFInfo
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- CN103647444B CN103647444B CN201310662068.1A CN201310662068A CN103647444B CN 103647444 B CN103647444 B CN 103647444B CN 201310662068 A CN201310662068 A CN 201310662068A CN 103647444 B CN103647444 B CN 103647444B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02P80/00—Climate change mitigation technologies for sector-wide applications
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Abstract
The invention provides a kind of two voltage-reduction high-power-factor constant current circuit and device, this circuit comprises the front stage circuits and late-class circuit that intercouple, and this front stage circuits is the reduction voltage circuit for realizing power factor correction; This late-class circuit is for realizing the step-down conversion circuit of DC-dc conversion; Wherein, this front stage circuits and late-class circuit share same switching tube and bus capacitor.It is more simple that circuit structure of the present invention compares two-stage structure, is conducive to reducing circuit cost, and compare the ripple current that single stage type structure can reduce output greatly.
Description
Technical field
The present invention relates to switch power technology, particularly relate to a kind of two voltage-reduction high-power-factor constant current circuit and device.
Background technology
At present, most of power consumption equipment is when accessing electrical network, and input AC electric current cannot be sinusoidal variations with input voltage waveform, thus current waveform distortion is serious, there is power factor (PF) very low, harmonic wave serious interference, the problem of the even impact normal work of other power consumption equipment around.International Electrotechnical Commission (IEC) has formulated the standard of IEC61000-3-2 harmonic current restriction, in order to limit the adverse effect that humorous wave interference may cause.Meanwhile, for the fail safe of guarantor when using power consumption equipment, major part A.C.-D.C. converter all requires to adopt isolated power stage design, thus needs to adopt optocoupler or other isolating device to realize the isolation of control circuit, will inevitably increase cost and the complexity of control circuit like this.
In order to solve the problem of low power factor, single-stage or two stage power factor correcting (PFC) circuit engineering are widely used in AC-DC power converter.
Relative to single-level power factor correction technology, it is little that two stage power factor correcting technology has output ripple, and the feature that power factor is high is widely used in circuit of power factor correction, and its basic theory diagram as shown in Figure 1.Input ac voltage is input to first order power factor correcting converter 101 after rectifier bridge rectification, first order power factor correcting converter 101 is conventional to realize Active Power Factor Correction, common topology has boosting (Boost), buck (Buck-boost) and step-down (Buck) structure.Because input current will follow the wave form varies of input voltage, thus input power is the power of pulsation, therefore between first order power factor correcting converter 101 and second level DC-DC converter 102, usually have a jumbo storage capacitor C
bulk, in order to ac input power and the stable DC output power of balance pulsation.Second level DC-DC converter 102 can realize effective adjustment to the voltage exported or electric current.
But because the scheme shown in Fig. 1 exists two stage power circuit, control circuit also needs corresponding two parts, and thus add the complexity of circuit, and cost is relatively high, loss is larger.
The single-stage power factor correcting circuit of another kind of prior art as shown in Figure 2.Wherein, two inputs that input source connects rectifier bridge 201 are exchanged, the positive output termination capacitor C of rectifier bridge 201
infirst end and the former limit winding W of transformer T
psame Name of Ends, the former limit winding W of transformer T
pdifferent name termination switching tube Q
1drain electrode, switching tube Q
1source electrode meet sampling resistor R
senfirst end, sampling resistor R
senthe second ground, termination former limit, the negative output termination capacitor C of rectifier bridge 201
inthe second end and receive simultaneously former limit ground, the first input end of secondary current analog module 202 meets sampling resistor R
senfirst end, the auxiliary winding W of the second input termination transformer T of secondary current analog module 202
adifferent name end, the output termination PFC of secondary current analog module 202 controls and the first input end of driver module 203, and PFC controls and second the inputting termination transformer and assist winding W of driver module 203
adifferent name end, PFC controls and the output termination switching tube Q of driver module 203
1grid.In Fig. 2, secondary current analog module 202 is by sampling resistor R
senobtain former limit switching current information, and simulate secondary current information, then send into PFC and control and driver module 203, carry out control switch pipe Q with the drive singal producing adjustable output constant current and PFC control
1, thus input power factor correction and output constant current is achieved in single stage shift circuit.
Adopt single-stage power factor correcting circuit technology, need to realize High Power Factor while guarantee stable output DC signal.Adopt in this way, simplify the complexity of power circuit structure and control circuit, transducer effciency density is high, and cost is low, but there is the shortcomings such as output current ripple is larger.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of two voltage-reduction high-power-factor constant current circuit and device, and it is more simple that its circuit structure compares two-stage structure, is conducive to reducing circuit cost, and compares the ripple current that single stage type structure can reduce output greatly.
For solving the problems of the technologies described above, the invention provides a kind of two voltage-reduction high-power-factor constant current circuit, comprising the front stage circuits and late-class circuit that intercouple, wherein,
This front stage circuits is the reduction voltage circuit for realizing power factor correction;
This late-class circuit is for realizing the step-down conversion circuit of DC-dc conversion;
Wherein, this front stage circuits and late-class circuit share same switching tube and bus capacitor.
According to one embodiment of present invention, described front stage circuits comprises:
Input capacitance, its first end connects positive input terminal, and its second end connects negative input end;
Described switching tube, its first power end connects the first end of described input capacitance, and its control end receives outside drive singal;
3rd diode, its anode connects the second power end of described switching tube;
Second diode, its negative electrode connects the negative electrode of described 3rd diode, and its anode connects the second end of described input capacitance;
Described bus capacitor, its first end connects the negative electrode of described 3rd diode;
First inductance, its first end connects the second end of described input capacitance, and its second end connects the second end of described bus capacitor;
Described late-class circuit comprises:
Described bus capacitor;
Described switching tube;
First diode, its negative electrode connects the first power end of described switching tube, and its anode connects the first end of described bus capacitor;
Sampling resistor, its first end connects the second power end of described switching tube;
Second inductance, its first end connects the second end of described sampling resistor;
4th diode, its negative electrode connects the second power end of described switching tube, and its anode connects the second end of described bus capacitor.
According to one embodiment of present invention, described late-class circuit also comprises:
Output loading, its first end connects the second end of described second inductance, and its second end connects the anode of described 4th diode, described output loading be output capacitance, load or output capacitance with load in parallel in any one.
According to one embodiment of present invention, during described switching tube conducting, the signal circuit of described front stage circuits is: the signal of described positive input terminal transfers to described negative input end via described switching tube, the 3rd diode and bus capacitor, and the signal circuit of described late-class circuit is: the signal of the first end of described bus capacitor transfers to the second end of described bus capacitor via described first diode, switching tube, sampling resistor, the second inductance, output loading; When described switching tube disconnects, the signal circuit of described front stage circuits is: the electric current flowing through described first inductance is back to described first inductance via described second diode and bus capacitor afterflow; The signal circuit of described late-class circuit is: the electric current flowing through described second inductance is back to described second inductance via described output loading, the 4th diode and sampling resistor afterflow.
According to one embodiment of present invention, described front stage circuits comprises:
Input capacitance, its first end connects positive input terminal, and its second end connects negative input end;
First inductance, its first end connects the first end of described input capacitance;
Described switching tube, its first power end connects the second end of described first inductance, and its control end receives outside drive singal;
Sampling resistor, its first end connects the second power end of described switching tube;
Second inductance, its first end connects the second end of described sampling resistor;
Described bus capacitor, its first end connects the first power end of described switching tube;
First diode, its anode connects the second end of described bus capacitor, and its negative electrode connects the first end of described input capacitance;
Described late-class circuit comprises:
Described bus capacitor;
Described switching tube;
Described sampling resistor;
Described second inductance;
Second diode, its negative electrode connects the second end of described bus capacitor, and its anode connects the second end of described input capacitance;
4th diode, its anode connects the anode of described second diode, and its negative electrode connects the second power end of described switching tube.
According to one embodiment of present invention, described front stage circuits and late-class circuit also comprise: output loading, its first end connects the second end of described second inductance, described output loading be output capacitance, load or output capacitance with load in parallel in any one.
According to one embodiment of present invention, during described switching tube conducting, the signal circuit of described front stage circuits is: the signal of described positive input terminal transfers to described negative input end via described first inductance, switching tube, sampling resistor, the second inductance and output loading, and the signal circuit of described late-class circuit is: the signal of the first end of described bus capacitor transfers to the second end of described bus capacitor via described switching tube, sampling resistor, the second inductance, output loading and the second diode; When described switching tube disconnects, the signal circuit of described front stage circuits is: the electric current flowing through described first inductance is back to described first inductance via described bus capacitor and the first diode continuousing flow; The signal circuit of described late-class circuit is: the electric current flowing through described second inductance is back to described second inductance via described output loading, the 4th diode and sampling resistor afterflow.
According to one embodiment of present invention, described front stage circuits comprises:
Input capacitance, its first end connects positive input terminal, and its second end connects negative input end;
First diode, its negative electrode connects the first end of described input capacitance;
First inductance, its first end connects the first end of described input capacitance;
Bus capacitor, its first end connects the second end of described first inductance, and its second end connects the anode of described first diode;
3rd diode, its anode connects the second end of described bus capacitor;
Switching tube, its first power end connects the negative electrode of described 3rd diode, and its control end receives outside drive singal;
Sampling resistor, its first end connects the second end of described input capacitance, and its second end connects the second power end of described switching tube;
Described late-class circuit comprises:
Described bus capacitor;
Described sampling resistor;
Described switching tube;
Second diode, its negative electrode connects the second end of described bus capacitor, and its anode connects the first end of described sampling resistor;
4th diode, its negative electrode connects the first end of described bus capacitor, the first power end of its anode connecting valve pipe;
Second inductance, its first end connects the first end of described bus capacitor.
According to one embodiment of present invention, described late-class circuit also comprises: output loading, its first end connects the second end of the second inductance, its second end connects the first power end of described switching tube, described output loading be output capacitance, load or output capacitance with load in parallel in any one.
According to one embodiment of present invention, during described switching tube conducting, the signal circuit of described front stage circuits is: the signal of described positive input terminal transfers to described negative input end via described first inductance, bus capacitor, the 3rd diode, switching tube and sampling resistor, and the signal circuit of described late-class circuit is: the signal of the first end of described bus capacitor transfers to the second end of described bus capacitor via described second inductance, output loading, switching tube, sampling resistor and the second diode; When described switching tube disconnects, the signal circuit of described front stage circuits is: what flow through described first inductance is back to described first inductance via described first diode and bus capacitor afterflow, and the signal circuit of described late-class circuit is: the electric current flowing through described second inductance is back to described second inductance via described output loading and the 4th diode continuousing flow.
According to one embodiment of present invention, described front stage circuits at least also comprises input capacitance and the first inductance, and described late-class circuit at least also comprises the second inductance and output loading, this output loading be output capacitance, load or output capacitance with load in parallel in any one, wherein
Described switching tube conduction period, described input capacitance, the first inductance and switching tube form the first loop, and described bus capacitor, switching tube, the second inductance and output loading form second servo loop;
Described switching tube blocking interval, described first inductance, bus capacitor form tertiary circuit, and described second inductance and output loading form the 4th loop.
According to one embodiment of present invention, described switching tube conduction period, the voltage that the voltage at described first inductance two ends equals described input capacitance two ends deducts the voltage at described bus capacitor two ends, the electric current flowing through described first inductance rises, the voltage that the voltage at described second inductance two ends equals described bus capacitor two ends deducts the voltage at described output loading two ends, and the electric current flowing through described second inductance rises; Described switching tube blocking interval, the voltage at described first inductance two ends equals the voltage at negative described bus capacitor two ends, the electric current flowing through described first inductance declines, the voltage at described second inductance two ends equals the voltage at negative described output loading two ends, and the electric current flowing through described second inductance declines.
According to one embodiment of present invention, this circuit also comprises: rectifier bridge, and to the ac supply signal rectification of input, its positive output end connects described positive input terminal, and its negative output terminal connects described negative input end.
According to one embodiment of present invention, described switching tube is power MOSFET, described first power end is the drain electrode of described mosfet transistor, and described second power end is the source electrode of described mosfet transistor, and described control end is the grid of described mosfet transistor.
According to one embodiment of present invention, described switching tube is pliotron, and described first power end is the collector electrode of described pliotron, and described second power end is the emitter of described pliotron, and described control end is the base stage of described pliotron.
According to one embodiment of present invention, described switching tube is unit switch.
Present invention also offers a kind of two step-down high power factor constant current device, comprising:
Two voltage-reduction high-power-factor constant current circuit described in above-mentioned any one;
Constant-current control drive circuit, the sampling of its current sample end obtains the current information of described sampling resistor, and described constant-current control drive circuit produces drive singal according to described current information, and this drive singal transfers to the control end of described switching tube.
According to one embodiment of present invention, the current sample end of described constant-current control drive circuit connects the first end of described sampling resistor, the second end ground connection of described sampling resistor; Or the current sample end of described constant-current control drive circuit connects the second end of described sampling resistor, the first end ground connection of described sampling resistor.
According to one embodiment of present invention, described constant-current control drive circuit also has zero passage detection end, for obtaining the zero passage information of described second inductance, described constant-current control drive circuit produces this drive singal according to described current information and zero passage information, and described device also comprises:
First resistance, its first end ground connection;
Second resistance, its first end connects the second end of described first resistance and the zero passage detection end of described constant-current control drive circuit, and its second end connects the first end of described output capacitance.
According to one embodiment of present invention, described constant-current control drive circuit also has zero passage detection end, for obtaining the zero passage information of described second inductance, described constant-current control drive circuit produces this drive singal according to described current information and zero passage information, and described device also comprises:
With the auxiliary winding of described second inductance coupling high, the different name end ground connection of this auxiliary winding, the Same Name of Ends of this auxiliary winding connects the zero passage detection end of described constant-current control drive circuit.
Compared with prior art, the present invention has the following advantages:
In two voltage-reduction high-power-factor constant current circuit of the embodiment of the present invention, front stage circuits is together with late-class circuit coupling integration, two-stage circuit shares same switching tube and bus capacitor, and its structure is quasi-single-stage configuration, compares two-stage type structure, circuit structure is more simple, is conducive to reducing circuit cost; Compare single stage type structure, greatly reduce the ripple current of output loading, without stroboscopic problem.
Further, the front stage circuits in two voltage-reduction high-power-factor constant current circuit of the embodiment of the present invention and late-class circuit are high-power step-down circuit, compare other topological structures and can obtain higher efficiency.
In addition, two voltage-reduction high-power-factor constant current circuit of the embodiment of the present invention and the current constant control of device can be realized by the inductive current in Direct Sampling late-class circuit, and be equivalent to Direct Sampling output load current, therefore constant current accuracy is higher.
Accompanying drawing explanation
Fig. 1 is a kind of theory diagram adopting the AC-DC power converter of two stage power factor correcting technology in prior art;
Fig. 2 is the schematic block circuit diagram of the single-stage power factor correcting circuit of a kind of former limit current constant control in prior art;
Fig. 3 is the schematic block circuit diagram of the first embodiment of of the present invention pair of step-down high power factor constant current device;
Fig. 4 is two step-down high power factor constant current device schematic equivalent circuit in the first operative state shown in Fig. 3;
Fig. 5 is two step-down high power factor constant current device schematic equivalent circuit in a second operative state shown in Fig. 3;
Fig. 6 is the schematic block circuit diagram of the second embodiment of of the present invention pair of step-down high power factor constant current device;
Fig. 7 is the schematic block circuit diagram of the 3rd embodiment of of the present invention pair of step-down high power factor constant current device;
Fig. 8 is the two step-down high power factor constant current devices schematic equivalent circuit in the first operative state shown in Fig. 7;
Fig. 9 is the two step-down high power factor constant current devices schematic equivalent circuit in a second operative state shown in Fig. 7;
Figure 10 is the schematic block circuit diagram of the 4th embodiment of of the present invention pair of step-down high power factor constant current device;
Figure 11 is two step-down high power factor constant current device schematic equivalent circuit in the first operative state shown in Figure 10;
Figure 12 is two step-down high power factor constant current device schematic equivalent circuit in a second operative state shown in Figure 10.
Embodiment
Of the present invention pair of voltage-reduction high-power-factor constant current circuit comprises the front stage circuits and late-class circuit that intercouple, this front stage circuits and late-class circuit are all buck configuration, wherein front stage circuits is used for realizing power factor correction, late-class circuit is used for realizing DC-dc conversion, this front stage circuits and late-class circuit share same switching tube and bus capacitor, in other words, this front stage circuits and late-class circuit integrate.Circuit structure of the present invention is quasi-single-stage configuration, on the one hand, compares conventional two-stage circuit, and circuit structure is more simple, is conducive to reducing circuit devcie cost; On the other hand, compare conventional single-level circuit, greatly reduce the ripple current of output loading, can effectively avoid stroboscopic problem.
Wherein, front stage circuits at least can comprise switching tube, bus capacitor, input capacitance and the first inductance, late-class circuit at least can comprise switching tube, bus capacitor, the second inductance and output loading, switching tube conduction period, input capacitance, the first inductance and switching tube form the first loop, and bus capacitor, switching tube, the second inductance and output loading form second servo loop; Switching tube blocking interval, the first inductance, bus capacitor form tertiary circuit, and described second inductance and output loading form the 4th loop.
Furthermore, switching tube conduction period, the voltage that the voltage at the first inductance two ends equals input capacitance two ends deducts the voltage at bus capacitor two ends, the electric current flowing through the first inductance rises, the voltage that the voltage at the second inductance two ends equals bus capacitor two ends deducts the voltage at output loading two ends, and the electric current flowing through the second inductance rises; Switching tube blocking interval, the voltage at the first inductance two ends equals the voltage at negative bus capacitor two ends, and the electric current flowing through the first inductance declines, and the voltage at the second inductance two ends equals the voltage at negative output loading two ends, and the electric current flowing through the second inductance declines.
Below in conjunction with specific embodiments and the drawings, the invention will be further described, but should not limit the scope of the invention with this.
First embodiment
Show two step-down high power factor constant current devices of the first embodiment with reference to figure 3, Fig. 3, comprise two voltage-reduction high-power-factor constant current circuit and coupled constant-current control drive circuit 301.
Furthermore, two voltage-reduction high-power-factor constant current circuit comprises the front stage circuits and late-class circuit that intercouple.Wherein, front stage circuits comprises: rectifier bridge BR, input capacitance C
in, switching tube Q
1, the second diode D
2, the 3rd diode D
3, bus capacitor C
bulk, the first inductance L
1; Late-class circuit comprises: bus capacitor C
bulk, switching tube Q
1, the first diode D
1, sampling resistor R
s, the second inductance L
2, output capacitance C
o, the 4th diode D
4.
Furthermore, the input of rectifier bridge BR receives ac supply signal Vac and carries out rectification to it, input capacitance C
infirst end connect the positive output end of rectifier bridge BR, input capacitance C
inthe second end connect the negative output terminal of rectifier bridge BR, the first diode D
1negative electrode connect input capacitance C
infirst end, the second diode D
2negative electrode meet the first diode D
1anode, the anode of the second diode D2 meets input capacitance C
inthe second end, switching tube Q
1the first power end connect the first diode D
1negative electrode, its control end receives outside drive singal, sampling resistor R
sfirst end connecting valve pipe Q
1the second power end; 3rd diode D
3anode connecting valve pipe Q
1the second power end, bus capacitor C
bulkthe first termination the 3rd diode D
3negative electrode and the first diode D
1anode, the 4th diode D
4negative electrode meet the 3rd diode D
3anode, the 4th diode D
4anode meet bus capacitor C
bulkthe second end, the first end of the first inductance L 1 connects input capacitance C
inthe second end; Second inductance L
2first end (or being called different name end) and sampling resistor R
sthe second end be connected, the second inductance L
2the second end (or being called Same Name of Ends) and output capacitance C
ofirst end be connected, output capacitance C
othe second end and bus capacitor C
bulkthe second end be connected, load configuration is and output capacitance C
oparallel connection, load and output capacitance C
ooutput loading can be collectively referred to as.Certainly, output loading also can only comprise load or output capacitance C
o.
In first embodiment, this pair of step-down high power factor constant current device also comprises the first resistance R
1with the second resistance R
2, the first resistance R
1first end ground connection, the first resistance R
1the second termination second resistance R
2first end and the zero passage detection end ZCD of constant-current control drive circuit 301, the second resistance R
2the second termination second inductance L
2the second end (or being called Same Name of Ends); The current sample end CS of constant-current control drive circuit 301 connects sampling resistor R
sfirst end, the ground end SGND of constant-current control drive circuit 301 meets sampling resistor R
sthe second end and ground connection, the output PWM of constant-current control drive circuit 301 meets switching tube Q
1control end.The current information that constant-current control drive circuit 301 receives according to current sample end CS and the zero passage information that zero passage detection end ZCD receives produce drive singal, and this drive singal transfers to switching tube Q by output PWM
1control end, with control switch pipe Q
1turn-on and turn-off.
As a nonrestrictive example, switching tube Q
1can be power MOSFET, the first power end be the drain electrode of mosfet transistor, and the second power end is the source electrode of described mosfet transistor, and control end is the grid of mosfet transistor.Or, switching tube Q
1can also be pliotron, the first power end be the collector electrode of pliotron, and the second power end is the emitter of pliotron, and control end is the base stage of pliotron.Or, switching tube Q
1can also be unit switch, or other suitable switching tube structures.
In addition, this constant-current control drive circuit 301 can be the drive circuit of any one current constant control in prior art.
With reference to the equivalent circuit diagram that figure 4, Fig. 4 is two step-down high power factor constant current device shown in Fig. 3 when the first operating state, in figure, dotted portion represents that line related and device do not participate in work.In the first operating state, switching tube Q
1conducting, the sinusoidal half-wave voltage of input ac power signal Vac after rectifier bridge BR rectification is through switching tube Q
1, the 3rd diode D
3, bus capacitor C
bulkwith the first inductance L
1the first inductance L is given in the loop formed
1charging, the first inductance L
1the voltage at two ends equals input capacitance C
inthe voltage at two ends deducts bus capacitor C
bulkthe voltage at two ends, flows through the first inductance L
1current i
l1rise; Meanwhile, bus capacitor C
bulkthrough switching tube Q
1, sampling resistor R
s, the second inductance L
2with output capacitance C
othe second inductance L is given in the loop formed
2charging, the second inductance L
2the voltage at two ends equals bus capacitor C
bulkthe voltage at two ends deducts output capacitance C
othe voltage at two ends, the second inductance L
2current i
l2rise.
Fig. 5 is the equivalent circuit diagram of the two step-down high power factor constant current devices shown in Fig. 3 when the second operating state, and in figure, dotted portion represents that corresponding circuit and device do not participate in work.In the second operating state, switching tube Q
1disconnect, flow through the first inductance L
1current i
l1through the second diode D
2, bus capacitor C
bulkwith the first inductance L
1the loop afterflow formed, the first inductance L
1the voltage at two ends equals negative bus capacitor C
bulkthe voltage at two ends, current i
l1decline; Meanwhile, the second inductance L is flowed through
2current i
l2through sampling resistor R
s, the second inductance L
2, output capacitance C
owith the 4th diode D
4the loop afterflow formed, the second inductance L
2the voltage at two ends equals negative output capacitance C
othe voltage at two ends, current i
l2decline.
As seen from the above analysis, the electric current flowing through sampling resistor is the second inductance L
2current i
l2, identical with the mean value of load current.Therefore as shown in Figure 3, by sampling resistor R
scurrent information send into constant-current control drive circuit 301, the direct current constant control to output loading can be realized by the constant-current control circuit of prior art; In addition, by the second inductance L
2current i
l2zero passage information (such as can pass through detection second inductance L
2the voltage zero-cross information of the second end obtain) send into constant-current control drive circuit 301, constant-current control drive circuit 301 is according to this zero passage information and sampling resistor R
scurrent information produce drive singal, open-minded in order to control switch pipe Q1, can current i be realized
l2for critical continuous conduction mode.Meanwhile, make to flow through the first inductance L as long as it will be appreciated by those skilled in the art that by rational parameter designing
1current i
l1be controlled as discontinuous conduct mode, get final product the power factor correction that nature realizes the AC power electric current Vac of input.
In addition, by the bus capacitor C of larger capacity
bulkbus capacitor C can be reduced
bulkthe voltage ripple at two ends, thus obtain less output load current ripple, eliminate stroboscopic.
Second embodiment
Show two step-down high power factor constant current devices of the second embodiment with reference to figure 6, Fig. 6, comprise two voltage-reduction high-power-factor constant current circuit and coupled constant-current control drive circuit 301.
Two voltage-reduction high-power-factor constant current circuit of the second embodiment is substantially identical with the first embodiment, and the main distinction is in the second embodiment, also comprises and the second inductance L
2the auxiliary winding W of coupling
a.Auxiliary winding W
adifferent name end ground connection, auxiliary winding W
athe zero passage detection end ZCS of termination constant-current control drive circuit 301 of the same name.In addition, the operation principle of the second embodiment is substantially identical with the first embodiment with equivalent operation process, no longer describes in detail here.
3rd embodiment
Show two step-down high power factor constant current devices of the 3rd embodiment with reference to figure 7, Fig. 7, comprise two voltage-reduction high-power-factor constant current circuit and coupled Drive and Control Circuit 301.
Furthermore, the front stage circuits of the 3rd embodiment is step-down (Buck) circuit on the spot, and late-class circuit is step-down (Buck) circuit on floating ground.
Wherein, front stage circuits comprises: rectifier bridge BR, input capacitance C
in, the first inductance L
1, switching tube Q
1, sampling resistor R
s, the second inductance L
2, bus capacitor C
bulk, the first diode D
1and output capacitance C
o; Late-class circuit comprises: bus capacitor C
bulk, switching tube Q
1, sampling resistor R
s, output capacitance C
o, the second inductance L
2, the second diode D
2, the 4th diode D
4.
Furthermore, rectifier bridge BR input termination ac supply signal Vac and rectification is carried out to it, input capacitance C
infirst end connect the positive output end of rectifier bridge BR, input capacitance C
inthe second end connect the negative output terminal of rectifier bridge BR, the first inductance L
1first end connect input capacitance C
infirst end, the first inductance L
1the second end connect switching tube Q
1the first power end and bus capacitor C
bulkfirst end, the first diode D
1negative electrode connect the first end of input capacitance, the first diode D
1anode meet bus capacitor C
bulkthe second end and the second diode D
2negative electrode, the second diode D
2anode meet input capacitance C
inthe second end, switching tube Q
1control end receive outside drive singal, sampling resistor R
sfirst end connecting valve pipe Q
1the second power end; Sampling resistor R
sthe second termination second inductance L
2first end, the second inductance L
2the second termination output capacitance C
ofirst end, output capacitance C
othe second termination input capacitance C
inthe second end, the 4th diode D
4negative electrode connecting valve pipe Q
1the second power end, the 4th diode D
4anode meet input capacitance C
inthe second end, load and output capacitance C
oparallel connection, load and output capacitance can be collectively referred to as output loading.Certainly, output loading also can only comprise load or output capacitance C
o.
In the present embodiment, the current sample end CS of constant-current control drive circuit 301 connects sampling resistor R
sfirst end, the ground end SGND of constant-current control drive circuit 301 meets sampling resistor R
sthe second end and ground connection, the output PWM of constant-current control drive circuit 301 meets switching tube Q
1control end.Flow through sampling resistor R
selectric current be the second inductance L
2current i
l2, identical with load current mean value.Therefore as shown in Figure 7, by sampling resistor R
scurrent information send into constant-current control drive circuit 301, constant-current control drive circuit 301, according to this current information, can realize the direct current constant control to output loading by the current constant control mode of prior art.
With reference to the equivalent circuit diagram that figure 8, Fig. 8 is two step-down high power factor constant current device shown in Fig. 7 when the first operating state, in figure, dotted portion represents that line related and device do not participate in work.In the first operating state, switching tube Q
1conducting, input ac power signal V
acsinusoidal half-wave voltage after rectifier bridge BR rectification is through the first inductance L
1, switching tube Q
1, sampling resistor R
s, the second inductance L
2with output capacitance C
othe first inductance L is given in the loop formed
1charging, the first inductance L
1the voltage at two ends equals input capacitance C
inthe voltage at two ends deducts bus capacitor C
bulkthe voltage at two ends, flows through the first inductance L
1current i
l1rise; Meanwhile, bus capacitor C
bulkthrough the second diode D
2, switching tube Q
1, sampling resistor R
s, the second inductance L
2with output capacitance C
othe second inductance L is given in the loop formed
2charging, the second inductance L
2both end voltage equals bus capacitor C
bulkboth end voltage deducts output capacitance C
oboth end voltage, the second inductance L
2current i
l2rise.
Fig. 9 is the equivalent circuit diagram of the two step-down high power factor constant current devices shown in Fig. 7 when the second operating state, and in figure, dotted portion represents that corresponding circuit and device do not participate in work.In the second operating state, switching tube Q
1disconnect, flow through the first inductance L
1current i
l1through the first diode D
2, bus capacitor C
bulkwith the first inductance L
1the loop afterflow formed, the first inductance L
1the voltage at two ends equals negative bus capacitor C
bulkboth end voltage, current i
l1decline; Meanwhile, the second inductance L is flowed through
2current i
l2through sampling resistor R
s, the second inductance L
2, output capacitance C
owith the 4th diode D
4the loop afterflow formed, the second inductance L
2both end voltage equals negative output capacitance C
othe voltage at two ends, current i
l2decline.
As a nonrestrictive example, switching tube Q
1can be power MOSFET, the first power end be the drain electrode of mosfet transistor, and the second power end is the source electrode of described mosfet transistor, and control end is the grid of mosfet transistor.Or, switching tube Q
1can also be pliotron, the first power end be the collector electrode of pliotron, and the second power end is the emitter of pliotron, and control end is the base stage of pliotron.Or, switching tube Q
1can also be unit switch, or other suitable switching tube structures.
4th embodiment
Show two step-down high power factor constant current devices of the 4th embodiment with reference to Figure 10, Figure 10, comprise two voltage-reduction high-power-factor constant current circuit and coupled Drive and Control Circuit 301.
Furthermore, the front stage circuits of the 4th embodiment is step-down (Buck) circuit on the spot, and rear class is also step-down (Buck) circuit on the spot.
Wherein, front stage circuits comprises: rectifier bridge BR, input capacitance C
in, the first diode D
1, the first inductance L
1, bus capacitor C
bulk, the 3rd diode D
3, switching tube Q
1, sampling resistor R
s; Late-class circuit comprises: bus capacitor C
bulk, sampling resistor R
s, switching tube Q
1, the second diode D
2, the 4th diode D
4, the second inductance L
2, output capacitance C
o.
Furthermore, rectifier bridge BR input termination ac supply signal Vac and rectification is carried out to it, input capacitance C
infirst end connect the positive output end of rectifier bridge BR, input capacitance C
inthe second end connect the negative output terminal of rectifier bridge BR, the first inductance L
1first end connect input capacitance C
infirst end, the first inductance L
1the second end connect the second inductance L
2first end, bus capacitor C
bulkfirst end and the 4th diode D
4negative electrode, the first diode D
1negative electrode meet input capacitance C
infirst end, the first diode D
1anode meet bus capacitor C
bulkthe second end, the second diode D
2negative electrode and the 3rd diode D
3anode, the second diode D
2anode meet input capacitance C
inthe second end, the second inductance L
2the second termination output capacitance C
ofirst end, output capacitance C
othe second termination the 3rd diode D
3negative electrode, the 4th diode D
4anode and switching tube Q
1the first power end, switching tube Q
1the second power terminations sampling resistor R
sthe second end, sampling resistor R
sthe first termination input capacitance C
inthe second end and ground connection; Switching tube Q
1control end receive outside drive singal, load and output capacitance C
oin parallel.
Reference Figure 11, Figure 11 are the two equivalent circuit diagram of step-down high power factor constant current device when the first operating state shown in Figure 10, and in figure, dotted portion represents that line related and device do not participate in work.In the first operating state, switching tube Q
1conducting, input ac power signal V
acsinusoidal half-wave voltage after rectifier bridge BR rectification is through the first inductance L
1, bus capacitor C
bulk, the 3rd diode D3, switching tube Q
1with sampling resistor R
sthe first inductance L is given in the loop formed
1charging, the first inductance L
1the voltage at two ends equals input capacitance C
inthe voltage at two ends deducts bus capacitor C
bulkthe voltage at two ends, flows through the first inductance L
1current i
l1rise; Meanwhile, bus capacitor C
bulkthrough diode D
2, switching tube Q
1, sampling resistor R
s, the second inductance L
2with output capacitance C
othe second inductance L is given in the loop formed
2charging, the second inductance L
2the voltage at two ends equals bus capacitor C
bulkthe voltage at two ends deducts output capacitance C
othe voltage at two ends, the second inductance L
2current i
l2rise.
Figure 12 is the equivalent circuit diagram of the two step-down high power factor constant current devices shown in Figure 10 when the second operating state, and in figure, dotted portion represents that corresponding circuit and device do not participate in work.In the second operating state, switching tube Q
1disconnect, flow through the first inductance L
1current i
l1through the first diode D
1, bus capacitor C
bulkwith the first inductance L
1the loop afterflow formed, the first inductance L
1the voltage at two ends equals negative bus capacitor C
bulkthe voltage at two ends, current i
l1decline; Meanwhile, the second inductance L is flowed through
2current i
l2through the second inductance L
2, output capacitance C
owith the 4th diode D
4the loop afterflow formed, the second inductance L
2the voltage at two ends equals negative output capacitance C
othe voltage at two ends, current i
l2decline.
In the present embodiment, the current sample end CS of constant-current control drive circuit 301 connects sampling resistor R
sfirst end, the ground end SGND of constant-current control drive circuit 301 meets sampling resistor R
sfirst end and ground connection, the output PWM of constant-current control drive circuit 301 meets switching tube Q
1control end.In the present embodiment, flow through sampling resistor R
selectric current can not direct reflected load electric current, therefore need in constant-current control drive circuit 301 inside by well known to a person skilled in the art that appropriate algorithm realizes the current constant control to output loading, therefore the 4th embodiment belongs to indirect current constant control, and constant current accuracy is relatively poor.
As a nonrestrictive example, switching tube Q
1can be power MOSFET, the first power end be the drain electrode of mosfet transistor, and the second power end is the source electrode of described mosfet transistor, and control end is the grid of mosfet transistor.Or, switching tube Q
1can also be pliotron, the first power end be the collector electrode of pliotron, and the second power end is the emitter of pliotron, and control end is the base stage of pliotron.Or, switching tube Q
1can also be unit switch, or other suitable switching tube structures.
In addition, with reference to figure 3, Fig. 6, Fig. 7 and Figure 10, in above-mentioned multiple embodiment, the current sample end CS of constant-current control drive circuit 301 connects sampling resistor R
sfirst end, sampling resistor R
sthe second end ground connection; But the technical staff of this professional domain should be appreciated that the current sample end CS of constant-current control drive circuit 301 can connect sampling resistor R
sthe second end, the first end R of sampling resistor
sground connection, then carries out oppositely, still can obtaining the function same with each embodiment above-mentioned to the current signal of sampling in constant-current control drive circuit 301.
In addition, it should be noted that, although the constant-current control drive circuit in above-mentioned first and second embodiments has zero passage detection end, and the constant-current control drive circuit in the third and fourth embodiment does not have zero passage detection end, but those skilled in the art are to be understood that, zero passage detection end is only the slave part in constant-current control drive circuit of the present invention, those skilled in the art can carry out suitable selection according to the concrete structure of two voltage-reduction high-power-factor constant current circuit and current constant control mode, select the constant-current control drive circuit having or do not have zero passage detection end.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible variation and amendment, the scope that therefore protection scope of the present invention should define with the claims in the present invention is as the criterion.
Claims (19)
1. a two voltage-reduction high-power-factor constant current circuit, comprises the front stage circuits and late-class circuit that intercouple, it is characterized in that,
This front stage circuits is the reduction voltage circuit for realizing power factor correction;
This late-class circuit is for realizing the step-down conversion circuit of DC-dc conversion;
Wherein, this front stage circuits and late-class circuit share same switching tube and bus capacitor, and described switching tube has the first power end, the second power end and control end,
Wherein, described switching tube conduction period, the voltage that the voltage at the first inductance two ends equals input capacitance two ends deducts the voltage at described bus capacitor two ends, the electric current flowing through described first inductance rises, the voltage that the voltage at the second inductance two ends equals described bus capacitor two ends deducts the voltage at output loading two ends, and the electric current flowing through described second inductance rises; Described switching tube blocking interval, the voltage at described first inductance two ends equals the voltage at negative described bus capacitor two ends, the electric current flowing through described first inductance declines, the voltage at described second inductance two ends equals the voltage at negative described output loading two ends, and the electric current flowing through described second inductance declines.
2. according to claim 1 pair of voltage-reduction high-power-factor constant current circuit, is characterized in that, described front stage circuits comprises:
Input capacitance, its first end connects positive input terminal, and its second end connects negative input end;
Described switching tube, its first power end connects the first end of described input capacitance, and its control end receives outside drive singal;
3rd diode, its anode connects the second power end of described switching tube;
Second diode, its negative electrode connects the negative electrode of described 3rd diode, and its anode connects the second end of described input capacitance;
Described bus capacitor, its first end connects the negative electrode of described 3rd diode;
First inductance, its first end connects the second end of described input capacitance, and its second end connects the second end of described bus capacitor;
Described late-class circuit comprises:
Described bus capacitor;
Described switching tube;
First diode, its negative electrode connects the first power end of described switching tube, and its anode connects the first end of described bus capacitor;
Sampling resistor, its first end connects the second power end of described switching tube;
Second inductance, its first end connects the second end of described sampling resistor;
4th diode, its negative electrode connects the second power end of described switching tube, and its anode connects the second end of described bus capacitor.
3. according to claim 2 pair of voltage-reduction high-power-factor constant current circuit, is characterized in that, described late-class circuit also comprises:
Output loading, its first end connects the second end of described second inductance, and its second end connects the anode of described 4th diode, described output loading be output capacitance, load or output capacitance with load in parallel in any one.
4. according to claim 3 pair of voltage-reduction high-power-factor constant current circuit, it is characterized in that, during described switching tube conducting, the signal circuit of described front stage circuits is: the signal of described positive input terminal transfers to described negative input end via described switching tube, the 3rd diode and bus capacitor, and the signal circuit of described late-class circuit is: the signal of the first end of described bus capacitor transfers to the second end of described bus capacitor via described first diode, switching tube, sampling resistor, the second inductance, output loading; When described switching tube disconnects, the signal circuit of described front stage circuits is: the electric current flowing through described first inductance is back to described first inductance via described second diode and bus capacitor afterflow; The signal circuit of described late-class circuit is: the electric current flowing through described second inductance is back to described second inductance via described output loading, the 4th diode and sampling resistor afterflow.
5. according to claim 1 pair of voltage-reduction high-power-factor constant current circuit, is characterized in that, described front stage circuits comprises:
Input capacitance, its first end connects positive input terminal, and its second end connects negative input end;
First inductance, its first end connects the first end of described input capacitance;
Described switching tube, its first power end connects the second end of described first inductance, and its control end receives outside drive singal;
Sampling resistor, its first end connects the second power end of described switching tube;
Second inductance, its first end connects the second end of described sampling resistor;
Described bus capacitor, its first end connects the first power end of described switching tube;
First diode, its anode connects the second end of described bus capacitor, and its negative electrode connects the first end of described input capacitance;
Described late-class circuit comprises:
Described bus capacitor;
Described switching tube;
Described sampling resistor;
Described second inductance;
Second diode, its negative electrode connects the second end of described bus capacitor, and its anode connects the second end of described input capacitance;
4th diode, its anode connects the anode of described second diode, and its negative electrode connects the second power end of described switching tube.
6. according to claim 5 pair of voltage-reduction high-power-factor constant current circuit, it is characterized in that, described front stage circuits and late-class circuit also comprise: output loading, its first end connects the second end of described second inductance, described output loading be output capacitance, load or output capacitance with load in parallel in any one.
7. according to claim 6 pair of voltage-reduction high-power-factor constant current circuit, it is characterized in that, during described switching tube conducting, the signal circuit of described front stage circuits is: the signal of described positive input terminal transfers to described negative input end via described first inductance, switching tube, sampling resistor, the second inductance and output loading, and the signal circuit of described late-class circuit is: the signal of the first end of described bus capacitor transfers to the second end of described bus capacitor via described switching tube, sampling resistor, the second inductance, output loading and the second diode; When described switching tube disconnects, the signal circuit of described front stage circuits is: the electric current flowing through described first inductance is back to described first inductance via described bus capacitor and the first diode continuousing flow; The signal circuit of described late-class circuit is: the electric current flowing through described second inductance is back to described second inductance via described output loading, the 4th diode and sampling resistor afterflow.
8. according to claim 1 pair of voltage-reduction high-power-factor constant current circuit, is characterized in that, described front stage circuits comprises:
Input capacitance, its first end connects positive input terminal, and its second end connects negative input end;
First diode, its negative electrode connects the first end of described input capacitance;
First inductance, its first end connects the first end of described input capacitance;
Bus capacitor, its first end connects the second end of described first inductance, and its second end connects the anode of described first diode;
3rd diode, its anode connects the second end of described bus capacitor;
Switching tube, its first power end connects the negative electrode of described 3rd diode, and its control end receives outside drive singal;
Sampling resistor, its first end connects the second end of described input capacitance, and its second end connects the second power end of described switching tube;
Described late-class circuit comprises:
Described bus capacitor;
Described sampling resistor;
Described switching tube;
Second diode, its negative electrode connects the second end of described bus capacitor, and its anode connects the first end of described sampling resistor;
4th diode, its negative electrode connects the first end of described bus capacitor, the first power end of its anode connecting valve pipe;
Second inductance, its first end connects the first end of described bus capacitor.
9. according to claim 8 pair of voltage-reduction high-power-factor constant current circuit, it is characterized in that, described late-class circuit also comprises: output loading, its first end connects the second end of the second inductance, its second end connects the first power end of described switching tube, described output loading be output capacitance, load or output capacitance with load in parallel in any one.
10. according to claim 9 pair of voltage-reduction high-power-factor constant current circuit, it is characterized in that, during described switching tube conducting, the signal circuit of described front stage circuits is: the signal of described positive input terminal transfers to described negative input end via described first inductance, bus capacitor, the 3rd diode, switching tube and sampling resistor, and the signal circuit of described late-class circuit is: the signal of the first end of described bus capacitor transfers to the second end of described bus capacitor via described second inductance, output loading, switching tube, sampling resistor and the second diode; When described switching tube disconnects, the signal circuit of described front stage circuits is: what flow through described first inductance is back to described first inductance via described first diode and bus capacitor afterflow, and the signal circuit of described late-class circuit is: the electric current flowing through described second inductance is back to described second inductance via described output loading and the 4th diode continuousing flow.
11. according to claim 1 pairs of voltage-reduction high-power-factor constant current circuit, it is characterized in that, described front stage circuits at least also comprises input capacitance and the first inductance, described late-class circuit at least also comprises the second inductance and output loading, this output loading be output capacitance, load or output capacitance with load in parallel in any one, wherein
Described switching tube conduction period, described input capacitance, the first inductance and switching tube form the first loop, and described bus capacitor, switching tube, the second inductance and output loading form second servo loop;
Described switching tube blocking interval, described first inductance, bus capacitor form tertiary circuit, and described second inductance and output loading form the 4th loop.
12. two voltage-reduction high-power-factor constant current circuit according to any one of claim 2 to 11, is characterized in that, also comprise:
Rectifier bridge, to the ac supply signal rectification of input, its positive output end connects described positive input terminal, and its negative output terminal connects described negative input end.
13. two voltage-reduction high-power-factor constant current circuit according to any one of claim 2 to 11, it is characterized in that, described switching tube is power MOSFET, described first power end is the drain electrode of described mosfet transistor, described second power end is the source electrode of described mosfet transistor, and described control end is the grid of described mosfet transistor.
14. two voltage-reduction high-power-factor constant current circuit according to any one of claim 2 to 11, it is characterized in that, described switching tube is pliotron, described first power end is the collector electrode of described pliotron, described second power end is the emitter of described pliotron, and described control end is the base stage of described pliotron.
15. two voltage-reduction high-power-factor constant current circuit according to any one of claim 2 to 11, it is characterized in that, described switching tube is unit switch.
16. 1 kinds of two step-down high power factor constant current devices, is characterized in that, comprising:
Two voltage-reduction high-power-factor constant current circuit according to any one of claim 2-15;
Constant-current control drive circuit, the sampling of its current sample end obtains the current information of described sampling resistor, and described constant-current control drive circuit produces drive singal according to described current information, and this drive singal transfers to the control end of described switching tube.
17. according to claim 16 pairs of step-down high power factor constant current devices, is characterized in that, the current sample end of described constant-current control drive circuit connects the first end of described sampling resistor, the second end ground connection of described sampling resistor; Or the current sample end of described constant-current control drive circuit connects the second end of described sampling resistor, the first end ground connection of described sampling resistor.
18. according to claim 16 pairs of step-down high power factor constant current devices, it is characterized in that, described constant-current control drive circuit also has zero passage detection end, for obtaining the zero passage information of described second inductance, described constant-current control drive circuit produces this drive singal according to described current information and zero passage information, and described device also comprises:
First resistance, its first end ground connection;
Second resistance, its first end connects the second end of described first resistance and the zero passage detection end of described constant-current control drive circuit, and its second end connects the second end of described second inductance.
19. according to claim 16 pairs of step-down high power factor constant current devices, it is characterized in that, described constant-current control drive circuit also has zero passage detection end, for obtaining the zero passage information of described second inductance, described constant-current control drive circuit produces this drive singal according to described current information and zero passage information, and described device also comprises:
With the auxiliary winding of described second inductance coupling high, the different name end ground connection of this auxiliary winding, the Same Name of Ends of this auxiliary winding connects the zero passage detection end of described constant-current control drive circuit.
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| CN103269164A (en) * | 2013-06-09 | 2013-08-28 | 杭州士兰微电子股份有限公司 | Primary side constant current controlled quasi single-stage high power factor circuit and device |
| CN103269162A (en) * | 2013-06-09 | 2013-08-28 | 杭州士兰微电子股份有限公司 | Quasi-single-stage high power factor constant current circuit and device |
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| CN103269164A (en) * | 2013-06-09 | 2013-08-28 | 杭州士兰微电子股份有限公司 | Primary side constant current controlled quasi single-stage high power factor circuit and device |
| CN103269162A (en) * | 2013-06-09 | 2013-08-28 | 杭州士兰微电子股份有限公司 | Quasi-single-stage high power factor constant current circuit and device |
| CN203590016U (en) * | 2013-12-09 | 2014-05-07 | 杭州士兰微电子股份有限公司 | Dual-buck high-power factor constant current circuit and device |
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