CN103929048A - Zero-crossing detection circuit of switching power supply - Google Patents
Zero-crossing detection circuit of switching power supply Download PDFInfo
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Abstract
The invention provides a zero-crossing detection circuit of a switching power supply. The zero-crossing detection circuit at least comprises a voltage input module, a voltage output module, an inductor, a switching tube, a coupling circuit, a resonance sampling module, a comparison control module and a control drive module. The voltage output module is connected to the voltage input module, the inductor is used for controlling output voltage through charging and discharging, the switching tube is used for controlling the inductor to charge and discharge, and the coupling circuit is used for coupling a resonance signal between leakage electrodes of the switching tube and the inductor into a grid electrode of the switching tube. The resonance sampling module is used for taking out currents and converting the currents into voltage output, wherein the currents are directly proportional to negative voltage of an output signal of the coupling circuit. According to the voltage output by the resonance sampling module, the comparison control module generates a control signal, and the control drive module is used for generating gate voltage of the switching tube. The zero-crossing detection circuit of the switching power supply can reduce the area of a pulse width modulation power supply chip substantially, and product competitiveness can be promoted.
Description
Technical field
The present invention relates to microelectronic, particularly relate to a kind of zero cross detection circuit of Switching Power Supply.
Background technology
Switching Power Supply adopts power semiconductor as switch, by a kind of power supply that turns on and off to maintain regulated output voltage or electric current of control switch.Compare with linear power supply, Switching Power Supply is less than linear power supply volume, efficiency is higher, energy-saving and environmental protection more.In some field, substituted linear power supply completely.Especially at current power consumption equipment volume, constantly reduce, voltage constantly reduces, and under the trend that mobile device is generally used, the application of Switching Power Supply is more and more extensive.At present, Switching Power Supply is just towards the future development of high frequency, miniaturization.
Because electronic technology is in constantly development and innovation, also constantly there is new form in switching power source chip control technology.Which kind of control mode all needs the internal circuit of chip to remove sampling and outputting voltage or electric current all the time, by the variation of sampling output variable, self is adjusted.According to the size of power output, make the structure of system, the feedback control technology of employing etc.
In the course of work of Switching Power Supply, if the electric current in inductance does not discharge completely in switching process, belong to continuous current mode (CCM); If the electric current in inductance discharges completely, recharge after a while, belong to discontinuous mode; After if the electric current in inductance discharges completely, charging immediately, belongs to critical conduction mode (BCM) again.No matter be discontinuous mode, or critical conduction mode, the electric current in inductance all will discharge completely.According to electric current in inductance, be that zero this feature is born and different Sampling techniques and control circuit.
Be illustrated in figure 1 the zero cross detection circuit 1 of a kind of source drive of generally using at present.This circuit comprises voltage input module 11, Voltage-output module 12, inductance L m, diode D, coupling circuit 13, switching tube M1, switching tube M2, resonance sampling module 14, comparator 15, trigger 16 and sampling resistor Rcs, wherein voltage input module 11, Voltage-output module 12, inductance L m, diode D, coupling circuit 13, switching tube M1 and sampling resistor Rcs are the outer device of sheet, and switching tube M2, resonance sampling module 14, comparator 15 and trigger 16 are device in sheet.Described coupling circuit 13 is coupled to the resonance signal between described inductance L m and described switching tube M1 the drain terminal of the described switching tube M2 in sheet, then described resonance sampling module 14 is to this signal sampling, described comparator 15 compares sampled signal and the reference voltage of described switching tube M2 drain terminal simultaneously, described trigger 16 receives the output signal of described resonance sampling module 14 and described comparator 15, and the conducting of described switching tube M2 and the control signal of disconnection are controlled in output.In this sample mode, will all the flow through switching tube M2 of chip internal of electric current in inductance L m, this switching tube M2 needs very large area, and the electric current in inductance L m is larger, the area of the switching tube M2 of chip internal is just larger, corresponding chip area is just larger, and the manufacturing cost based on this point chip has just improved greatly, and the competitiveness of product has also reduced with regard to corresponding.
How to improve the cost of the zero passage detection chip of Switching Power Supply, improving product competitiveness is those skilled in the art's problem demanding prompt solution.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of zero cross detection circuit of Switching Power Supply, high for solving the cost of zero passage detection chip of prior art Switching Power Supply, the problem that product competitiveness is low.
For achieving the above object and other relevant objects, the invention provides a kind of zero cross detection circuit of Switching Power Supply, the zero cross detection circuit of described Switching Power Supply at least comprises:
Voltage input module, Voltage-output module, inductance, switching tube, coupling circuit, resonance sampling module, comparison control module and control driver module;
Described Voltage-output module is connected in described voltage input module, for output voltage;
Described inductance is connected in described Voltage-output module, and the charge and discharge by described inductance carry out regulation output voltage, make it be stabilized in set point;
Described switching tube is connected in described inductance, by the turn-on and turn-off of described switching tube, controls described inductance charge and discharge, when described switching tube conducting, and described induction charging, when described switching tube turn-offs, described inductive discharge;
The input of described coupling circuit is connected between described inductance and the drain electrode of described switching tube, the output of described coupling circuit is connected in the grid of described switching tube, for the resonance signal between described inductance and the drain electrode of described switching tube being coupled to the grid of described switching tube;
Described resonance sampling module is connected in described coupling circuit, for taking out the electric current proportional with the negative voltage of described coupling circuit output signal, and is converted into Voltage-output;
Described relatively control module is connected in described resonance sampling module, according to the voltage of described resonance sampling module output, produces control signal;
Described control driver module is connected in the output of described relatively control module and described switching tube, for generation of the gate voltage of controlling described switching tube turn-on and turn-off.
Preferably, the zero cross detection circuit of described Switching Power Supply is applicable to the pulse width modulated power supply of discontinuous mode or critical conduction mode.
Preferably, described voltage input module comprises power supply and is connected in the filter capacitor of described power supply.
Preferably, described Voltage-output module comprises output capacitance and is parallel to the load of described output capacitance.
Preferably, described switching tube is NMOSFET.
Preferably, described coupling circuit is electric capacity or by the electric capacity circuit forming in series with a resistor.
Preferably, described relatively control module comprises the first comparator, the first trigger and buffer; The input of described the first comparator connects respectively described resonance sampling module and the first reference voltage, and the output signal of described resonance sampling module and described the first reference voltage are compared; Described the first trigger is connected in described the first comparator, when described the first comparator output high level signal described in the first trigger output high level pulse; Described buffer is connected in described the first trigger, for buffer output signal.
More preferably, described the first trigger is d type flip flop.
Preferably, described control drive circuit comprises the second comparator and the second trigger, described the second comparator is made comparisons the voltage signal corresponding with described switching tube output current and the second reference voltage, and exporting comparative result to described the second trigger, described the second trigger is for exporting the gate voltage that drives described switching tube.
More preferably, described the second trigger can be d type flip flop or rest-set flip-flop.
Preferably, also comprise diode, the anodic bonding of described diode is between the drain electrode of described inductance and described switching tube, and the negative electrode of described diode is connected in described voltage input module, when described switching tube conducting, and described diode cut-off; When described switching tube turn-offs, described diode current flow, provides path to described inductance and described Voltage-output module.
Preferably, also comprise sampling resistor, one end of described sampling resistor is connected in the output of described switching tube, and other end ground connection, for gathering the voltage corresponding with described switching tube output current.
As mentioned above, the zero cross detection circuit of Switching Power Supply of the present invention, has following beneficial effect:
The zero cross detection circuit of Switching Power Supply of the present invention is optimized circuit structure, the switching tube of the switching tube of chip internal and chip exterior is synthesized to a switch, and be positioned over chip exterior, the area of chip can be dwindled widely, improve the competitiveness of product.
Accompanying drawing explanation
Fig. 1 is shown as the schematic diagram of the zero cross detection circuit of Switching Power Supply of the prior art.
Fig. 2 is shown as the schematic diagram of the zero cross detection circuit of Switching Power Supply of the present invention.
Fig. 3 is shown as the circuit diagram of resonance sampling module of the zero cross detection circuit of Switching Power Supply of the present invention.
Fig. 4 (a) is shown as the waveform schematic diagram that zero cross detection circuit inductance under discontinuous mode of Switching Power Supply of the present invention discharges and recharges.
Fig. 4 (b) is shown as the waveform schematic diagram of zero cross detection circuit Lx node under discontinuous mode of Switching Power Supply of the present invention.
Fig. 4 (c) is shown as the waveform schematic diagram of zero cross detection circuit Gs node under discontinuous mode of Switching Power Supply of the present invention.
Fig. 5 (a) is shown as the waveform schematic diagram that zero cross detection circuit inductance under critical conduction mode of Switching Power Supply of the present invention discharges and recharges.
Fig. 5 (b) is shown as the waveform schematic diagram of zero cross detection circuit Lx node under critical conduction mode of Switching Power Supply of the present invention.Fig. 5 (c) is shown as the waveform schematic diagram of zero cross detection circuit Gs node under critical conduction mode of Switching Power Supply of the present invention.Element numbers explanation
The zero cross detection circuit of 1 Switching Power Supply
11 voltage input modules
12 Voltage-output modules
13 coupling circuits
14 resonance sampling modules
15 comparators
16 rest-set flip-flops
The zero cross detection circuit of 2 Switching Power Supplies
21 voltage input modules
22 Voltage-output modules
221 loads
23 coupling circuits
24 resonance sampling modules
25 comparison control circuits
251 first comparators
252 first triggers
253 buffers
26 control driver module
261 second comparators
262 second triggers
CT filter capacitor
Cout output capacitance
Lm inductance
M switching tube
M1 switching tube
M2 switching tube
D diode
Rcs sampling resistor
Embodiment
Below, by specific instantiation explanation embodiments of the present invention, those skilled in the art can understand other advantages of the present invention and effect easily by the disclosed content of this specification.The present invention can also be implemented or be applied by other different embodiment, and the every details in this specification also can be based on different viewpoints and application, carries out various modifications or change not deviating under spirit of the present invention.
Refer to Fig. 2～Fig. 5 (c).It should be noted that, the diagram providing in the present embodiment only illustrates basic conception of the present invention in a schematic way, satisfy and only show with assembly relevant in the present invention in graphic but not component count, shape and size drafting while implementing according to reality, during its actual enforcement, kenel, quantity and the ratio of each assembly can be a kind of random change, and its assembly layout kenel also may be more complicated.
As shown in Figure 2, the invention provides a kind of zero cross detection circuit 2 of Switching Power Supply, the zero cross detection circuit 2 of described Switching Power Supply at least comprises:
Voltage input module 21, Voltage-output module 22, inductance L m, switching tube M, coupling circuit 23, resonance sampling module 24, comparison control module 25, control driver module 26, diode D and sampling resistor Rcs.
Described voltage input module 21 is for providing input voltage vin.
As shown in Figure 2, described voltage input module 21 comprises power supply Vin and filter capacitor CT, described filter capacitor CT one end is connected with the output of described voltage input module 21, and other end ground connection, for carrying out filtering to the voltage Vin of described voltage input module 21 outputs.
Described Voltage-output module 22 is connected in described voltage input module 21, for the voltage of stable output.
As shown in Figure 2, described Voltage-output module 22 comprises output capacitance Cout and is parallel to the load 221 of described output capacitance Cout.Described output capacitance Cout is used for storing electric charge and powers to described load 221.
Described inductance L m is connected in described Voltage-output module 22, by described inductance L m discharge and recharge regulation output voltage, make it be stabilized in set point.
As shown in Figure 2, one end of described inductance L m is connected in output capacitance Cout and load 221, and the other end is connected in the drain terminal of described switching tube M.
Described switching tube M is connected in described inductance L m, by the turn-on and turn-off of described switching tube M, control described inductance L m charge and discharge, when described switching tube M conducting, input voltage vin is given described inductance L m charging, when described switching tube M turn-offs, described inductance L m electric discharge, provides power supply to described Voltage-output module 22.In the present embodiment, described switching tube M is preferably NMOSFET.
The anodic bonding of described diode D is between described inductance L m and described switching tube M, the negative electrode of described diode D is connected in described voltage input module 21, when described switching tube M turn-offs, described diode D provides path to described inductance L m and described Voltage-output module 22.
As shown in Figure 2, the drain electrode of described switching tube M is connected in described inductance L m, and when described switching tube M conducting, described input voltage vin is given described inductance L m charging; When described switching tube M turn-offs, charging path disconnects, and described inductance L m provides power supply to the loop of diode D and output module 22 formation.
One end of described sampling resistor Rcs is connected in the source electrode of described switching tube M, and other end ground connection, for gathering the voltage corresponding with described switching tube M output current.
The input of described coupling circuit 23 is connected between described inductance L m and the drain electrode of described switching tube M, and the output of described coupling circuit 23 is connected in the grid of described switching tube M.Described coupling circuit 23 is for electric capacity or by the electric capacity circuit forming in series with a resistor.In the present embodiment, described coupling circuit 23 is an electric capacity.
As shown in Figure 2, the input of described coupling circuit 23 is connected between described inductance L m and the drain electrode of described switching tube M, the output of described coupling circuit 23 is connected in the grid of described switching tube M, starting of oscillation when described inductance L m zero crossing, described electric capacity 23 is handed over every straight-through, resonance signal is coupled to the grid of described switching tube M.
Described resonance sampling module 24 is connected in described coupling circuit 23, for taking out the electric current proportional with the negative voltage of described coupling circuit 24 output signals, and described electric current is converted into Voltage-output.
Be illustrated in figure 3 an embodiment of described resonance sampling module 24, resistance R s one end is connected in the output Gs of described coupling circuit 23, metal-oxide-semiconductor Mn1 and metal-oxide-semiconductor Mn2 form current-mirror structure, and due to the source electrode b ground connection of metal-oxide-semiconductor Mn2, the source electrode a point current potential of metal-oxide-semiconductor Mn1 is also 0.The voltage V of ordering as Gs
gSwhile being less than zero, the path that has current flowing resistance Rs, metal-oxide-semiconductor Mn1, metal-oxide-semiconductor Mp1 and metal-oxide-semiconductor Mp2 to form, this electric current I
rS=| V
gS|/Rs.Through the mirror image between Mp1, Mp2 and Mp5, Mp6, produce sampling current: Isense=K * I
rS, wherein K is the scale factor of mirror image, the voltage V that this electric current and Gs are ordered
gSthe proportional relation of negative voltage.Via resistance R sense, be converted into Voltage-output again, described voltage Vsense=Isense * Rsense.Resonance zero passage is larger, the voltage V that Gs is ordered
gSmore be less than 0, I
rSlarger, corresponding Isense and Vsense are also just larger.If the voltage V that Gs is ordered
gSbeing more than or equal to 0, Vsense also just equals zero.
Described relatively control module 25 is connected in described resonance sampling module 24, according to the voltage of described resonance sampling module 24 outputs, produces pulse signal Dpulse.
As shown in Figure 2, in the present embodiment, described relatively control module 25 comprises the first comparator 251; The first trigger 252, in the present embodiment, described the first trigger is preferably d type flip flop; And buffer 253.The input of described the first comparator 251 connects respectively described resonance sampling module 24 and the first reference voltage Vref 1, as shown in Figure 2, the positive input of described the first comparator 251 is connected in the output of described resonance sampling module 24, the reverse input end of described the first comparator 251 connects the first reference voltage Vref 1, described the first comparator 251 compares the output signal of described resonance sampling module 24 and described the first reference voltage Vref 1, when being greater than described the first reference voltage Vref 1, exports the signal of described resonance sampling module 24 outputs high level signal, otherwise, output low level signal.Described the first trigger 252 is connected in described the first comparator 251, and when described the first comparator 251 output high level signal, described the first trigger 252 produces high level pulse signal.Described buffer 253 is connected in the output of described the first trigger 252, plays cushioning effect, guarantees the synchronous transmission of data or clock, and the output signal of described buffer 253 is pulse signal Dpulse.
Described control driver module 26 is connected in the output of described relatively control module 25 and described switching tube M, for generation of the gate voltage V that controls described switching tube M turn-on and turn-off
gS.
As shown in Figure 2, in the present embodiment, described control drive circuit 26 comprises the second comparator 261 and the second trigger 262, and described the second trigger 262 can be d type flip flop or rest-set flip-flop, and in the present embodiment, described the second trigger 262 is rest-set flip-flop.Described the second comparator 261 is made comparisons the voltage signal Vcs corresponding with described switching tube M output current and the second reference voltage Vref 2, and exporting comparative result to described rest-set flip-flop, described rest-set flip-flop is for exporting the gate voltage V that drives described switching tube M
gS, when the signal Dpulse of described buffer 253 outputs is high level, when the signal Vcs of described the second comparator 261 outputs is low level, described gate voltage V
gSfor high level, other situations are low level.
Zero cross detection circuit 2 operation principles of above-mentioned Switching Power Supply are as follows:
When described switching tube M conducting, described voltage input module 21, described Voltage-output module 22, described inductance L m, described switching tube M and described sampling resistor Rcs form loop, and described input presses Vin to described inductance L m charging; When described switching tube M turn-offs, loop disconnects, and described output module 22, described inductance L m and described diode D form new loop, and now, described inductance L m electric discharge, for described output module 22 provides the energy.
The zero cross detection circuit 2 of described Switching Power Supply is applicable to the pulse width modulated power supply of discontinuous mode or critical conduction mode.
Under discontinuous mode, when the discharging current in described inductance L m is slowly down to 0, the electric current in described inductance L m starts to occur resonance, and as shown in Fig. 4 (a), the electric current in described inductance L m occurs resonance 0 position.Also there is resonance in the voltage of the node Lx between the drain electrode of described inductance L m and described switching tube M, as shown in Fig. 4 (b) thereupon.This resonance signal is coupled to the gate voltage V of described switching tube M by described coupling circuit 23
gS, as shown in Fig. 4 (c), during due to described inductance L m electric discharge, described switching tube M is off state, in the present embodiment, described switching tube is NMOSFET, so gate voltage V
gSlow level partial coupling resonance signal, shows as the voltage of 0V in the present embodiment.
Gate voltage V
gSat 0V voltage location generation resonance, will produce the voltage lower than 0V, when the voltage lower than 0V is collected by described resonance sampling module 24, by produce one with the proportional electric current of this negative voltage, and with voltage form output, and by described comparison control module 25 generation high level signals; Simultaneously, described the first comparator 261 is made comparisons sampled voltage Vcs and reference voltage Vref 2, because inductance L m is in discharge condition, so described switching tube M turn-offs, the voltage Vcs corresponding with described switching tube M output current is less than described reference voltage Vref 2, described the second comparator 261 output low level signals; The high level signal that described relatively control module 25 produces is connected in the R end of described rest-set flip-flop 262, the low level signal of described the second comparator 261 outputs is connected in the S end of described rest-set flip-flop 262, and described rest-set flip-flop 262 produces the gate voltage V of described switching tube M
gS, this gate voltage V
gSfor high level pulse, act on the grid of described switching tube M, described switching tube M conducting, described inductance L m enters charge mode.
Described inductance L m starts charging, and current value increases gradually, as shown in Fig. 4 (a).The voltage of node Lx between described inductance L m and described switching tube M is 0V, as shown in Fig. 4 (b).The gate voltage V of described switching tube M
gSfor high level signal, as gate voltage V
gSwhile being more than or equal to 0V, described relatively control module 25 produces low level signal.The output current of described switching tube M increases gradually, when the voltage Vcs corresponding with described switching tube M output current is greater than reference voltage Vref 1, described rest-set flip-flop 262 saltus steps are low level, and described switching tube M turn-offs, and described inductance L m reenters discharge mode.
By controlling the gate voltage V of described switching tube M grid
gScontrol the shutoff of the conducting of described switching tube M, further control the charge and discharge of described inductance L m, regulate the output voltage of described Voltage-output module 22, make it be stable at a certain set point.
Under critical conduction mode, principle is consistent, at this, does not repeat one by one, and different is under this pattern, and after the electric current in described inductance L m discharges completely, charging immediately, only has a zero crossing again, can not occur for a long time resonance.As Fig. 5 (a) is depicted as the waveform schematic diagram that under critical conduction mode, inductance L m discharges and recharges.Fig. 5 (b) is depicted as the waveform schematic diagram of Lx node under critical conduction mode.Fig. 5 (c) is shown as the waveform schematic diagram of Gs node under critical conduction mode.
In the zero cross detection circuit 2 of Switching Power Supply of the present invention, described voltage input module 21, Voltage-output module 22, inductance L m, diode D, coupling circuit 23, switching tube M and sampling resistor Rcs are the outer device of sheet; Resonance sampling module 24, comparator 15 and trigger 16 are device in sheet.The zero cross detection circuit of Switching Power Supply of the present invention is guaranteed at optimized circuit, on the basis of stable output voltage, the large area metal-oxide-semiconductor in sheet to be merged to the metal-oxide-semiconductor outside sheet, greatly reduces chip area, effectively reduces costs improving product competitiveness.
In sum, the zero cross detection circuit of Switching Power Supply of the present invention, at least comprises the voltage of power supply input module is provided; Be connected in described voltage input module, due to the Voltage-output module of output voltage; By discharging and recharging the inductance of controlling output voltage; Control the switching tube that inductance discharges and recharges; Resonance signal is coupled to the coupling circuit of switching tube grid; Gather the described resonance sampling module of described switching tube gate voltage zero cross signal; Produce the comparison control module of pulse signal and the control driver module that produces described switching tube gate voltage.When inductive current is zero, between switching tube and inductance, there is resonance, this resonance signal is coupled to the grid of described switching tube by described coupling circuit.The grid that resonance signal is coupled to switching tube shows as the oscillator signal of zero crossing.Described resonance sample circuit takes out the resonance current being directly proportional to this resonance signal negative voltage, and this resonance current converts Voltage-output to described comparison control circuit, then produces by controlling driver module the conducting that control signal is controlled described switching tube.The zero cross detection circuit of Switching Power Supply of the present invention can significantly reduce the area of pulse width modulated power supply chip.So the present invention has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all can, under spirit of the present invention and category, modify or change above-described embodiment.Therefore, such as in affiliated technical field, have and conventionally know that the knowledgeable, not departing from all equivalence modifications that complete under disclosed spirit and technological thought or changing, must be contained by claim of the present invention.
Claims (12)
1. a zero cross detection circuit for Switching Power Supply, is characterized in that, the zero cross detection circuit of described Switching Power Supply at least comprises:
Voltage input module, Voltage-output module, inductance, switching tube, coupling circuit, resonance sampling module, comparison control module and control driver module;
Described Voltage-output module is connected in described voltage input module, for output voltage;
Described inductance is connected in described Voltage-output module, and the charge and discharge by described inductance carry out regulation output voltage, make it be stabilized in set point;
Described switching tube is connected in described inductance, by the turn-on and turn-off of described switching tube, controls described inductance charge and discharge, when described switching tube conducting, and described induction charging, when described switching tube turn-offs, described inductive discharge;
The input of described coupling circuit is connected between described inductance and the drain electrode of described switching tube, the output of described coupling circuit is connected in the grid of described switching tube, for the resonance signal between described inductance and the drain electrode of described switching tube being coupled to the grid of described switching tube;
Described resonance sampling module is connected in described coupling circuit, for taking out the electric current proportional with the negative voltage of described coupling circuit output signal, and is converted into Voltage-output;
Described relatively control module is connected in described resonance sampling module, according to the voltage of described resonance sampling module output, produces control signal;
Described control driver module is connected in the output of described relatively control module and described switching tube, for generation of the gate voltage of controlling described switching tube turn-on and turn-off.
2. the zero cross detection circuit of Switching Power Supply according to claim 1, is characterized in that: the zero cross detection circuit of described Switching Power Supply is applicable to the pulse width modulated power supply of discontinuous mode or critical conduction mode.
3. the zero cross detection circuit of Switching Power Supply according to claim 1, is characterized in that: described voltage input module comprises power supply and is connected in the filter capacitor of described power supply.
4. the zero cross detection circuit of Switching Power Supply according to claim 1, is characterized in that: described Voltage-output module comprises output capacitance and is parallel to the load of described output capacitance.
5. the zero cross detection circuit of Switching Power Supply according to claim 1, is characterized in that: described switching tube is NMOSFET.
6. the zero cross detection circuit of Switching Power Supply according to claim 1, is characterized in that: described coupling circuit is electric capacity or by the electric capacity circuit forming in series with a resistor.
7. the zero cross detection circuit of Switching Power Supply according to claim 1, is characterized in that: described relatively control module comprises the first comparator, the first trigger and buffer; The input of described the first comparator connects respectively described resonance sampling module and the first reference voltage, and the output signal of described resonance sampling module and described the first reference voltage are compared; Described the first trigger is connected in described the first comparator, when described the first comparator output high level signal described in the first trigger output high level pulse; Described buffer is connected in described the first trigger, for buffer output signal.
8. the zero cross detection circuit of Switching Power Supply according to claim 7, is characterized in that: described the first trigger is d type flip flop.
9. the zero cross detection circuit of Switching Power Supply according to claim 1, it is characterized in that: described control drive circuit comprises the second comparator and the second trigger, described the second comparator is made comparisons the voltage signal corresponding with described switching tube output current and the second reference voltage, and exporting comparative result to described the second trigger, described the second trigger is for exporting the gate voltage that drives described switching tube.
10. the zero cross detection circuit of Switching Power Supply according to claim 9, is characterized in that: described the second trigger can be d type flip flop or rest-set flip-flop.
The zero cross detection circuit of 11. Switching Power Supplies according to claim 1, it is characterized in that: also comprise diode, the anodic bonding of described diode is between the drain electrode of described inductance and described switching tube, the negative electrode of described diode is connected in described voltage input module, when described switching tube conducting, described diode cut-off; When described switching tube turn-offs, described diode current flow, provides path to described inductance and described Voltage-output module.
The zero cross detection circuit of 12. Switching Power Supplies according to claim 1, it is characterized in that: also comprise sampling resistor, one end of described sampling resistor is connected in the output of described switching tube, and other end ground connection, for gathering the voltage corresponding with described switching tube output current.
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| CN104914294A (en) * | 2015-05-26 | 2015-09-16 | 孙景春 | Zero-cross detection circuit structure |
| CN105807125A (en) * | 2016-05-20 | 2016-07-27 | 深圳芯智汇科技有限公司 | Zero-crossing detection circuit and switching power supply including same |
| CN105866519A (en) * | 2016-04-08 | 2016-08-17 | 北京集创北方科技股份有限公司 | Zero-crossing detection circuit compatible with multiple DC-DC conversion circuits |
| CN107147286A (en) * | 2017-07-03 | 2017-09-08 | 中国科学院上海微系统与信息技术研究所 | Current over-zero detection method, circuit and the control method of Switching Power Supply inductance |
| CN107306467A (en) * | 2016-04-25 | 2017-10-31 | 中国科学院上海微系统与信息技术研究所 | A kind of simplex winding non-isolated LED constant current drive system and its drive control method |
| CN107682955A (en) * | 2017-09-30 | 2018-02-09 | 上海晶丰明源半导体股份有限公司 | Controller, demagnetization detection method and the LED drive system being applicable |
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