CN109639118A - Self-powered circuit, control chip and the Switching Power Supply and electric device of Switching Power Supply - Google Patents
Self-powered circuit, control chip and the Switching Power Supply and electric device of Switching Power Supply Download PDFInfo
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- CN109639118A CN109639118A CN201910064254.2A CN201910064254A CN109639118A CN 109639118 A CN109639118 A CN 109639118A CN 201910064254 A CN201910064254 A CN 201910064254A CN 109639118 A CN109639118 A CN 109639118A
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- 238000004146 energy storage Methods 0.000 claims description 4
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
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Abstract
The present invention relates to self-powered circuit, control chip and the Switching Power Supplies and electric device for Switching Power Supply.The self-powered circuit includes: switch block, storage capacitor, control circuit and charge pump.Wherein switch block first end passes through storage capacitor ground connection for the primary coil of connection switch supply convertor, second end；Storage capacitor is used to power for control circuit and charge pump；Control circuit exports the work that corresponding control signal controls charge pump to charge pump according to the height of storage capacitor voltage in scheduled voltage range；Control signal of the charge pump according to control circuit, the control terminal of output switching signal to switch block, with the turn-on and turn-off of control switch component.Implement the present invention, when can be lightly loaded in Switching Power Supply or is unloaded, by in scheduled voltage range, making the controller of its Switching Power Supply or control chip provide normal working power the control of storage capacitor voltage, so that the controller or control chip of Switching Power Supply can work normally.
Description
Technical field
The present invention relates to field of switch power, and in particular to a kind of switch power controller light load or it is unloaded when from
Power supply circuit, and the control chip comprising the self-powered circuit, Switching Power Supply, and the electrical dress powered by the Switching Power Supply
It sets.
Background technique
The circuits of common switching power converters as shown in Figure 1, control circuit control switch converter connection and closing,
To reach the energy conversion output of switch converters.Control circuit itself will also consume energy, therefore must power to control circuit,
Common mode is that the feed circuit provided by switch converters provides energy for control circuit, but this power supply circuit is defeated
Supply voltage can change with output loading out, and supply voltage height, when underloading or zero load, feedback are fed back when heavy duty
Supply voltage can decline many than full load, and even lower than control circuit works normally required voltage, affects control circuit
Normal work.
Summary of the invention
The technical problem to be solved in the present invention is that being transformation in underloading or zero load for Switching Power Supply in the prior art
The feedback supply voltage fall of the control circuit power supply of device is big, may influence the defect of control circuit normal work, provide
A kind of self-powered circuit in light load or zero load for switch power controller power supply, and include the self-powered circuit
Control chip, Switching Power Supply and electric device.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of self-powered electricity for Switching Power Supply
Road characterized by comprising switch block, storage capacitor, control circuit and charge pump；Wherein
The switch block first end passes through the energy storage for the primary coil of connection switch supply convertor, second end
Capacity earth；
The storage capacitor is used to power for the control circuit and charge pump；
The control circuit exports in scheduled voltage range according to the height of the voltage of the storage capacitor corresponding
Control signal controls the work of the charge pump to the charge pump；
The charge pump is used for the control signal according to the control circuit, output switching signal to the switch block
Control terminal, to control the turn-on and turn-off of the switch block；And
The control circuit is when the voltage of the storage capacitor drops to the first predetermined voltage, output instruction charge pump work
The control signal of work, and when the voltage of the storage capacitor rises to the second predetermined voltage, output instruction charge pump stops work
The control signal of work, wherein second predetermined voltage is higher than the first predetermined voltage, the scheduled voltage range is second pre-
Constant voltage is between the first predetermined voltage.
In the self-powered circuit of the present invention for Switching Power Supply,
The switch block is double pole triode, and the collector of the double pole triode is used at the beginning of with the converter
The connection of grade coil, emitter are connect with the storage capacitor, and base stage is connect with the output end of the charge pump, or
The switch block is N-channel MOS field-effect tube, the drain electrode of the N-channel MOS field-effect tube for the change
The connection of parallel operation primary coil, source electrode are connect with the storage capacitor, and grid is connect with the output end of the charge pump.
In the self-powered circuit of the present invention for Switching Power Supply, the charge pump is boosting charge pump, to produce
The raw output voltage for being higher than one predetermined value of storage capacitor voltage is as the control double pole triode or N-channel MOS field
The switching signal of effect pipe conducting, wherein the predetermined value is the conducting of the double pole triode or N-channel MOS field-effect tube
Voltage value.
In the self-powered circuit of the present invention for Switching Power Supply, the charge pump is two times of boosting charge pumps, is used
To generate the output voltage of two times of the storage capacitor voltage as controlling the double pole triode or N-channel MOS field-effect
The switching signal of the switching signal conducting of pipe conducting.
In the self-powered circuit of the present invention for Switching Power Supply, two times of boosting charge pumps include: the first electricity
Appearance, the second capacitor, first diode, the second diode, PMOS tube M1 and the first NMOS tube M2, in which:
The anode of first diode is connect with the voltage output end of storage capacitor, the cathode connection the two or two of first diode
The anode of pole pipe, the cathode of the second diode connect the first end of the second capacitor, the second end ground connection of the second capacitor；
The drain electrode of PMOS tube M1 and the voltage output end of storage capacitor connect, the source electrode of PMOS tube M1 and the first NMOS tube M2
Drain electrode connection, the source electrode ground connection of the first NMOS tube M2, it is electric that the grid of PMOS tube M1 and the first NMOS tube M2 connect the control
The output end on road；
The first end of first capacitor is connect with the source electrode of PMOS tube M1, the second end of first capacitor and bearing for first diode
Pole connection.
In the self-powered circuit of the present invention for Switching Power Supply, the control circuit includes for detecting the storage
The detection circuit of energy capacitance voltage, the signal generating circuit for generating the control signal according to testing result.
In the self-powered circuit of the present invention for Switching Power Supply, the detection circuit includes comparator, the first electricity
Resistance, second resistance, 3rd resistor and the second NMOS tube M3, the signal generating circuit includes oscillator, wherein
First resistor, second resistance, 3rd resistor are successively connected between the voltage output end of storage capacitor and ground, are compared
The positive input of device terminates reference potential, and negative input end connects the node between first resistor and second resistance, the output of comparator
The input terminal of connection oscillator is held, the output end of oscillator is the output end for controlling signal；The grid of second NMOS tube M3 connects
The output end of comparator, source electrode ground connection, the node between drain electrode connection second resistance, 3rd resistor.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of control core for Switching Power Supply
Piece, switch block, control circuit and the charge pump being integrated in the self-powered circuit as described above for Switching Power Supply thereon,
To provide working power using storage capacitor in underloading or zero load for the control chip.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of Switching Power Supply, including passes through transformation
The input circuit and output circuit of device electrical connection, which is characterized in that primary coil one end of converter is connected with as described above
For the self-powered circuit of Switching Power Supply, to be provided in underloading or zero load using storage capacitor for the controller of Switching Power Supply
Working power.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of electric device, including as described above
Switching Power Supply, and by the Switching Power Supply provide working power.
Electric device, including Switching Power Supply as described above, and working power is provided by the Switching Power Supply.
Implement the present invention, having the advantages that can be when Switching Power Supply be lightly loaded or be unloaded, by by storage capacitor
Output voltage control in scheduled voltage range, make its Switching Power Supply controller or control chip normal work is provided
Make power supply, so that the controller or control chip of Switching Power Supply can work normally.
It in addition, self-powered circuit structure of the invention is simple, thus can inexpensive and effectively be the control of Switching Power Supply
Device processed or control chip realize the self-powered in underloading or zero load.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the circuit diagram of the switching power converters of the prior art；
Fig. 2 is circuit diagram of the present invention for the self-powered circuit of Switching Power Supply；
Fig. 3 is the circuit diagram of the self-powered circuit of Switching Power Supply according to an embodiment of the invention；
Fig. 4 is the circuit of two times of boosting charge pumps in the self-powered circuit of Switching Power Supply according to an embodiment of the invention
Figure；
Fig. 5 is the circuit diagram of control circuit in the self-powered circuit of Switching Power Supply according to an embodiment of the invention；
Fig. 6 is the node voltage waveform diagram of control circuit shown in fig. 5；
Fig. 7 is work wave schematic diagram of the present invention for the self-powered circuit of Switching Power Supply.
Specific embodiment
Fig. 2 is circuit diagram of the present invention for the self-powered circuit of Switching Power Supply.In each embodiment of the invention,
In Switching Power Supply underloading or zero load, connection type shown in Fig. 2 is configured by main switch (i.e. switch block K).
As shown in Fig. 2, input circuit 1 is electrically connected (coupling) with output circuit 2 by converter 3.
Switch block K first end passes through storage capacitor C for the primary coil of connection switch supply convertor 3, second end
Ground connection；Storage capacitor C is that control circuit 4 and charge pump 5 are powered；Control circuit 4 is in scheduled voltage range according to energy storage electricity
The corresponding control signal V0 of height output for holding the voltage vcc of C controls the work of charge pump 5 to charge pump 5；Charge pump 5 is used
In the control terminal according to control the signal V0, output switching signal Vout to switch block K of control circuit 4, with control switch portion
The turn-on and turn-off of part K.
Further, control circuit 4 is when the voltage vcc of storage capacitor C drops to the first predetermined voltage Vref1, output
Indicate the control signal of charge pump, and when the voltage vcc of storage capacitor C rises to the second predetermined voltage Vref2, output
It indicates the control signal that charge pump stops working, wherein the second predetermined voltage Vref2 is higher than the first predetermined voltage Vref1, makes a reservation for
Voltage range be between the second predetermined voltage Vref2 to the first predetermined voltage Vref1.
Specific work process is as follows, and control circuit 4 takes electricity from storage capacitor C, and detects the voltage on storage capacitor, works as electricity
After appearance voltage drops to the first predetermined voltage Vref1, control circuit controls charge pump, and charge pump takes electricity from capacitor and converts
Component K is turned on the switch to drive higher than the signal of capacitance voltage out；Capacitance voltage rises after switch block K conducting, when on voltage
After being raised to the second predetermined voltage Vref2, control circuit control charge pump stops working, switch block K cut-off, the electricity of storage capacitor
Pressure stops rising, and so repeats.The voltage of storage capacitor will be maintained in scheduled voltage range, i.e. the first predetermined voltage
In section between Vref1 and the second predetermined voltage Vref2.
In the preferred embodiment of the present invention, in switching power circuit, switch block K can be used double pole triode or
The realization of N-channel MOS field-effect tube, connection type such as Fig. 3.In embodiment as shown in Figure 3, the collector of double pole triode Q
For connecting with converter primary coil, emitter and storage capacitor C connection, base stage connect with the output end of charge pump 5.When adopting
With N-channel MOS field-effect tube, connection type are as follows: the drain electrode of N-channel MOS field-effect tube for being connect with converter primary coil,
Source electrode is connect with storage capacitor C, and grid connect (not shown) with the output end of charge pump 5.
In the various embodiments of the invention, charge pump 5 is boosting charge pump, is higher than storage capacitor C voltage Vcc to generate
The switching signal Vout that the output voltage of one predetermined value is connected as control double pole triode Q or N-channel MOS field-effect tube,
Wherein predetermined value is the turn-on voltage of double pole triode or N-channel MOS field-effect tube.
In the preferred embodiment of the present invention, charge pump 5 is two times of boosting charge pumps, and the output voltage generated is storage
Two times of energy capacitor C voltage Vcc are used as the switching signal of control double pole triode Q or the conducting of N-channel MOS field-effect tube
Vout。
Fig. 4 is the circuit of two times of boosting charge pumps in the self-powered circuit of Switching Power Supply according to an embodiment of the invention
Figure.As shown in figure 4, two times of boosting charge pumps include: first capacitor C1, the second capacitor C2, first diode D1, the second diode
D2, PMOS tube M1 and the first NMOS tube M2.The anode of first diode D is connect with the voltage output end of storage capacitor C, and the one or two
The cathode of pole pipe D1 connects the anode of the second diode D2, and the cathode of the second diode D2 connects the first end of the second capacitor C2
(its output switching signal Vout), the second end ground connection of the second capacitor C2.The drain electrode of PMOS tube M1 and the voltage of storage capacitor C are defeated
Outlet connection, the source electrode of PMOS tube M1 are connect with the drain electrode of the first NMOS tube M2, the source electrode ground connection of the first NMOS tube M2, PMOS tube
The grid of M1 and the first NMOS tube M2 connect the output end of control circuit 4, to receive the control signal V0 from control circuit 4.
The first end of first capacitor C1 is connect with the source electrode of PMOS tube M1, the second end of first capacitor C1 and the cathode of first diode D1
Connection.
In Fig. 4, V0 be by control circuit generate control signal (such as square-wave signal), V1 be PMOS tube M1 source electrode with
The voltage of the drain electrode connecting node of first NMOS tube M2, V2 are the voltage of first diode D1 cathode, the second diode D2 anode.
When controlling signal V0 is high level, PMOS tube M1 cut-off, the first NMOS tube M2 conducting, the source electrode of PMOS tube M1 and first
Voltage V1 is low level at the drain electrode connecting node of NMOS tube M2, and storage capacitor voltage vcc is by first diode D1 to first
Capacitor C1 charging.When controlling signal V0 becomes low level, PMOS tube M1 conducting, the first NMOS tube M2 ends, and V1 rises to height
Level, VCC charge to the second capacitor C2 by first capacitor C1, the second diode D2.If ignoring diode drop,
Second capacitor C2 both end voltage (i.e. switching signal) Vout=2*Vcc.
Since the core of charge pump whole work process is capacitor charge and discharge process, so most important formula is electricity
Hold charge and discharge formula: I*T=Δ V*C, wherein T is the capacitor charge and discharge period, and Δ V is capacitor both ends electricity in each charging-discharging cycle
Pressure fluctuation, I is charging and discharging currents.
In each embodiment of the present invention, control circuit 4 include for detect the detection circuit of storage capacitor C voltage Vcc,
For generating the signal generating circuit of control signal V0 according to testing result.
Fig. 5 is the circuit diagram of control circuit in the self-powered circuit of Switching Power Supply according to an embodiment of the invention, and Fig. 6 is
The node voltage waveform diagram of control circuit shown in fig. 5.
As shown in figure 5, detection circuit includes comparator 41, divider resistance R0, R1, R2 and the second NMOS tube M3, signal hair
Raw circuit includes oscillator 42.Wherein, first resistor R0, second resistance R1,3rd resistor R2 are successively connected in storage capacitor C's
Between voltage output end and ground, the positive input of comparator 41 terminates reference potential, and negative input end connects first resistor R0 and second
Node between resistance R1, the input terminal of the output end connection oscillator 42 of comparator, the output end of oscillator are control signal
The output end of V0；The output end of the grid connection comparator of second NMOS tube M3, source electrode ground connection, drain electrode connection second resistance R1,
Node between 3rd resistor R2.
Comparator 41, the first resistor R0 as divider resistance, second resistance R1,3rd resistor R2 and the second NMOS tube M3
Constitute the hysteresis comparator of typical detection storage capacitor C voltage Vcc.Vref_CP is reference potential, and Va is through divider resistance
Sampled voltage (as shown in Figure 5) after partial pressure, Vb are the output of comparator 41.As shown in fig. 6, working as storage capacitor C voltage Vcc ratio
When lower, exporting Vb than machine 41 is high level, and oscillator 42 receives Vb high level and starts to work, and exports square-wave signal；
When the voltage vcc of storage capacitor C is relatively high, exporting Vb than machine 41 is low level, and oscillator receives Vb low level and stops
It only works, exports low level signal.
Switch block K (such as double pole triode Q or N-channel MOS field-effect in the above-mentioned self-powered circuit of the present invention
Pipe), control circuit 4 and charge pump 5 can be integrated in control chip (the control core as shown in Figures 2 and 3 for Switching Power Supply
Piece 6) in, to provide normal work power supply using storage capacitor C in underloading or zero load for the control chip of Switching Power Supply.It needs
It is noted that control chip 6 is in addition to may include above-mentioned 3 modules (i.e. switch block K, control in some embodiments of the present invention
Circuit 4 processed and charge pump 5) outside, can also include for the ON/OFF of control switch component K when overloaded and for energy storage electricity
Hold the circuit module of C charging.
Fig. 7 is the operating wave of the self-powered circuit in the control chip for Switching Power Supply according to one embodiment of the invention
Shape schematic diagram, voltage vcc on storage capacitor due to chip internal circuits loss, from higher than the second predetermined voltage Vref2's
A certain voltage is begun to decline.When Vcc voltage drops to the first predetermined voltage Vref1, the control signal V0 of control circuit output
For square-wave signal, charge pump receives square-wave signal, and the output voltage Vout signal that output is higher than storage capacitor voltage vcc drives
The base stage of triode, triode generate base current to amplify and pass through emitter and charge to Vcc capacitor (i.e. storage capacitor), make
Storage capacitor voltage vcc is obtained to increase；When storage capacitor voltage vcc is increased to the second predetermined voltage Vref2, control circuit output
Control signal V0 become low level, charge pump stops working, output voltage Vout decline, triode stop to storage capacitor
Power supply, due to the power consumption of chip, storage capacitor voltage vcc becomes declining from rising, and so on, storage capacitor voltage vcc energy
It enough substantially remains between Vref1 and Vref2 and fluctuates.
When VCC voltage is higher than the second predetermined voltage Vref2, underloading power supply mode will stop, can be by heavily loaded supplier of electricity
Formula give VCC provide be higher than the second predetermined voltage Vref2 voltage, then underloading power supply mode would not intervene, when load gradually
Reduce heavily loaded power supply mode and be not enough to provide sufficiently high voltage, VCC voltage will decline, when VCC drops to the first predetermined electricity
Vref1 is pressed, underloading power supply mode will power for VCC.
In technical solution of the present invention, the first predetermined voltage Vref1 and the second predetermined voltage Vref2 are by chip or circuit
Operating voltage or device pressure resistance determine, in one embodiment optional Vref1=4.9V, Vref2=5.1V.
The above-mentioned self-powered circuit of the present invention is in Switching Power Supply.The Switching Power Supply includes being electrically connected (coupling by converter
Close) input circuit and output circuit, primary coil one end of converter be connected with it is as described above for Switching Power Supply from
Power supply circuit, to provide working power using storage capacitor C in underloading or zero load for the controller of Switching Power Supply.
Switching Power Supply comprising the above-mentioned self-powered circuit of the present invention can be applied to electric device, such as low power charger,
LED lamp etc. provides working power by the Switching Power Supply comprising the self-powered circuit.Present invention is particularly suitable for interruptions to use
And underloading or it is unloaded when there is still a need for for switching power converters controller or control chip power with guarantee controller or
Control the electric device that chip works normally.For example, mobile phone has been taken away after it is that mobile phone is fully charged that user is using charger, but
Charger is additionally attached to not remove on AC power supply base, need at this time by control chip controls Switching Power Supply input circuit no longer
Transmitting electric energy to output circuit, i.e. control chip needs storage capacitor to provide working power always for it, thus storage capacitor
Output voltage Vcc needs to control in predetermined range.
The present invention relates under underloading or no-load condition, when transformer stops transmitting energy to output, using main switch to VCC
Capacitor (storage capacitor), which charges, drops to voltage needed for circuit hereinafter, and transmitting energy to output end to avoid the voltage of VCC capacitor
Measuring and charging to VCC is that timesharing is realized.
Above embodiments only technical concepts and features to illustrate the invention, its object is to allow person skilled in the art
Scholar can understand the contents of the present invention and implement accordingly, can not limit the scope of the invention.It is all to be wanted with right of the present invention
The equivalent changes and modifications that range is done are sought, should belong to the covering scope of the claims in the present invention.
Claims (10)
1. a kind of self-powered circuit for Switching Power Supply characterized by comprising switch block (K), storage capacitor (C), control
Circuit (4) processed and charge pump (5)；Wherein
Switch block (K) first end passes through the energy storage for the primary coil of connection switch supply convertor, second end
Capacitor (C) ground connection；
The storage capacitor (C) is used to power for the control circuit (4) and charge pump (5)；
The control circuit (4) exports in scheduled voltage range according to the height of the voltage (Vcc) of the storage capacitor (C)
It is corresponding to control signal (V0) to the charge pump (5) to control the work of the charge pump (5)；
The charge pump (5) is used for the control signal (V0) according to the control circuit (4), output switching signal (Vout) to institute
The control terminal of switch block (K) is stated, to control the turn-on and turn-off of the switch block (K)；And
The control circuit (4) is defeated when the voltage (Vcc) of the storage capacitor (C) drops to the first predetermined voltage (Vref1)
The control signal of charge pump is indicated out, and when the voltage (Vcc) of the storage capacitor (C) rises to the second predetermined voltage
(Vref2) when, the control signal that stops working of output instruction charge pump, wherein second predetermined voltage (Vref2) is higher than the
One predetermined voltage (Vref1), the scheduled voltage range are the second predetermined voltages (Vref2) to the first predetermined voltage
(Vref1) between.
2. the self-powered circuit according to claim 1 for Switching Power Supply, which is characterized in that
The switch block (K) is double pole triode (Q), and the collector of the double pole triode (Q) is used for and the change
The connection of parallel operation primary coil, emitter are connect with the storage capacitor (C), and base stage is connect with the output end of the charge pump (5),
Or
The switch block (K) is N-channel MOS field-effect tube, the drain electrode of the N-channel MOS field-effect tube for the change
The connection of parallel operation primary coil, source electrode are connect with the storage capacitor (C), and grid is connect with the output end of the charge pump (5).
3. the self-powered circuit according to claim 2 for Switching Power Supply, which is characterized in that the charge pump (5) is
Boosting charge pump, to generate the output voltage for being higher than the storage capacitor (C) voltage (Vcc) predetermined value as described in control
Double pole triode (Q) or the switching signal (Vout) of N-channel MOS field-effect tube conducting, wherein the predetermined value is described double
The turn-on voltage of polar form triode or N-channel MOS field-effect tube.
4. the self-powered circuit according to claim 2 for Switching Power Supply, which is characterized in that the charge pump (5) is
Two times of boosting charge pumps, it is described double as controlling to generate the output voltage of two times of voltage (Vcc) of the storage capacitor (C)
The switching signal (Vout) of switching signal (Vout) conducting of polar form triode (Q) or the conducting of N-channel MOS field-effect tube.
5. the self-powered circuit according to claim 4 for Switching Power Supply, which is characterized in that two times of boosted charges
Pump includes: first capacitor (C1), the second capacitor (C2), first diode (D1), the second diode (D2), PMOS tube (M1) and
One NMOS tube (M2), in which:
The anode of first diode D is connect with the voltage output end of storage capacitor (C), and the cathode of first diode (D1) connects the
The anode of two diodes (D2), the first end of the cathode connection the second capacitor (C2) of the second diode (D2), the second capacitor (C2)
Second end ground connection；
The drain electrode of PMOS tube (M1) is connect with the voltage output end of storage capacitor (C), the source electrode and the first NMOS of PMOS tube (M1)
Manage the drain electrode connection of (M2), the source electrode ground connection of the first NMOS tube (M2), the grid company of PMOS tube (M1) and the first NMOS tube (M2)
Connect the output end of the control circuit (4)；
The first end of first capacitor (C1) is connect with the source electrode of PMOS tube (M1), the second end of first capacitor (C1) and the one or two pole
Manage the cathode connection of (D1).
6. the self-powered circuit according to claim 1 for Switching Power Supply, which is characterized in that the control circuit (4)
Including being used to detect the detection circuit of the voltage (Vcc) of the storage capacitor (C), for generating the control according to testing result
The signal generating circuit of signal (V0).
7. the self-powered circuit according to claim 7 for Switching Power Supply, which is characterized in that the detection circuit includes
Comparator (41), first resistor (R0), second resistance (R1), 3rd resistor (R2) and the second NMOS tube (M3), the signal hair
Raw circuit includes oscillator (42), wherein
First resistor (R0), second resistance (R1), 3rd resistor (R2) be successively connected in the voltage output end of storage capacitor (C) with
Between ground, the positive input of comparator terminates reference potential, and negative input end connects between first resistor (R0) and second resistance (R1)
Node, the input terminal of the output end connection oscillator of comparator (41), the output end of oscillator (42) is control signal (V0)
Output end；The output end of the grid connection comparator of second NMOS tube (M3), source electrode ground connection, drain electrode connection second resistance
(R1), the node between 3rd resistor (R2).
8. a kind of control chip for Switching Power Supply, which is characterized in that integrate thereon just like the use described in claim 1 to 7
Switch block (K), control circuit (4) and charge pump (5) in the self-powered circuit of Switching Power Supply, so as in underloading or zero load
When using storage capacitor (C) for the control chip provide working power.
9. a kind of Switching Power Supply, including the input circuit and output circuit being electrically connected by converter, which is characterized in that converter
The connection of primary coil one end just like the self-powered circuit for Switching Power Supply described in claim 1 to 7, so as to being lightly loaded or
Working power is provided for the controller of Switching Power Supply using storage capacitor (C) when unloaded.
10. a kind of electric device, which is characterized in that provided including the Switching Power Supply as described in right 9, and by the Switching Power Supply
Working power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910064254.2A CN109639118B (en) | 2019-01-23 | 2019-01-23 | Self-powered circuit of switching power supply, control chip, switching power supply and electric device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910064254.2A CN109639118B (en) | 2019-01-23 | 2019-01-23 | Self-powered circuit of switching power supply, control chip, switching power supply and electric device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109639118A true CN109639118A (en) | 2019-04-16 |
| CN109639118B CN109639118B (en) | 2024-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910064254.2A Active CN109639118B (en) | 2019-01-23 | 2019-01-23 | Self-powered circuit of switching power supply, control chip, switching power supply and electric device |
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Cited By (2)
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| CN110518790A (en) * | 2019-08-28 | 2019-11-29 | 南京微盟电子有限公司 | A kind of quick start and self-contained electric system of switching power converters |
| CN111001900A (en) * | 2019-12-26 | 2020-04-14 | 江门市保值久机电有限公司 | Welding gun control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110518790A (en) * | 2019-08-28 | 2019-11-29 | 南京微盟电子有限公司 | A kind of quick start and self-contained electric system of switching power converters |
| CN111001900A (en) * | 2019-12-26 | 2020-04-14 | 江门市保值久机电有限公司 | Welding gun control circuit |
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| CN109639118B (en) | 2024-01-26 |
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