CN109639118B - Self-powered circuit of switching power supply, control chip, switching power supply and electric device - Google Patents
Self-powered circuit of switching power supply, control chip, switching power supply and electric device Download PDFInfo
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- CN109639118B CN109639118B CN201910064254.2A CN201910064254A CN109639118B CN 109639118 B CN109639118 B CN 109639118B CN 201910064254 A CN201910064254 A CN 201910064254A CN 109639118 B CN109639118 B CN 109639118B
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- 239000003990 capacitor Substances 0.000 claims abstract description 107
- 238000004146 energy storage Methods 0.000 claims abstract description 51
- 230000005669 field effect Effects 0.000 claims description 23
- 238000001514 detection method Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000007599 discharging Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
Abstract
The invention relates to a self-powered circuit for a switching power supply, a control chip, a switching power supply and an electrical device. The self-powered circuit includes: the switching component, the energy storage capacitor, the control circuit and the charge pump. The first end of the switch component is used for connecting the primary coil of the switch power supply converter, and the second end of the switch component is grounded through the energy storage capacitor; the energy storage capacitor is used for supplying power to the control circuit and the charge pump; the control circuit outputs corresponding control signals to the charge pump according to the voltage of the energy storage capacitor within a preset voltage range so as to control the work of the charge pump; the charge pump outputs a switching signal to a control end of the switching component according to a control signal of the control circuit so as to control the on and off of the switching component. By implementing the invention, the energy storage capacitor voltage can be controlled within the preset voltage range when the switching power supply is in light load or no load, so that the energy storage capacitor voltage can provide a normal working power supply for a controller or a control chip of the switching power supply, and the controller or the control chip of the switching power supply can work normally.
Description
Technical Field
The invention relates to the field of switching power supplies, in particular to a self-powered circuit of a switching power supply controller in light load or no load, a control chip comprising the self-powered circuit, a switching power supply and an electric device powered by the switching power supply.
Background
The circuit of a conventional switching power converter is shown in fig. 1, and a control circuit controls the switching on and off of the switching power converter to achieve the energy conversion output of the switching power converter. The control circuit itself also consumes energy, so that the control circuit must be supplied with power, and a common mode is that the feedback circuit provided by the switch converter provides energy for the control circuit, but the output power supply voltage of the power supply circuit can change along with the output load, the feedback power supply voltage is high in heavy load, and the feedback power supply voltage can drop much more than full load or even be lower than the voltage required by the normal operation of the control circuit, so that the normal operation of the control circuit is influenced.
Disclosure of Invention
The invention aims to solve the technical problem that in the prior art, the feedback power supply voltage of a switching power supply for supplying power to a control circuit of a converter in light load or no load has large descending amplitude and possibly affects the normal operation of the control circuit.
The technical scheme adopted for solving the technical problems is as follows: a self-powered circuit for a switching power supply is constructed, comprising: the switching component, the energy storage capacitor, the control circuit and the charge pump; wherein the method comprises the steps of
The first end of the switch component is used for connecting a primary coil of the switch power supply converter, and the second end of the switch component is grounded through the energy storage capacitor;
the energy storage capacitor is used for supplying power to the control circuit and the charge pump;
the control circuit outputs corresponding control signals to the charge pump in a preset voltage range according to the voltage of the energy storage capacitor so as to control the charge pump to work;
the charge pump is used for outputting a switching signal to the control end of the switching component according to the control signal of the control circuit so as to control the on and off of the switching component; and, in addition, the method comprises the steps of,
the control circuit outputs a control signal indicating that the charge pump is operated when the voltage of the storage capacitor is reduced to a first predetermined voltage, and outputs a control signal indicating that the charge pump is stopped when the voltage of the storage capacitor is increased to a second predetermined voltage, wherein the second predetermined voltage is higher than the first predetermined voltage, and the predetermined voltage range is between the second predetermined voltage and the first predetermined voltage.
In the self-powered circuit for a switching power supply of the present invention,
the switch component is a bipolar triode, the collector of the bipolar triode is used for being connected with the primary coil of the converter, the emitter of the bipolar triode is connected with the energy storage capacitor, the base of the bipolar triode is connected with the output end of the charge pump, or
The switch component is an N-channel MOS field effect transistor, the drain electrode of the N-channel MOS field effect transistor is used for being connected with the primary coil of the converter, the source electrode of the N-channel MOS field effect transistor is connected with the energy storage capacitor, and the grid electrode of the N-channel MOS field effect transistor is connected with the output end of the charge pump.
In the self-powered circuit for a switching power supply of the present invention, the charge pump is a boost charge pump, and is configured to generate an output voltage higher than the voltage of the storage capacitor by a predetermined value as a switching signal for controlling the bipolar transistor or the N-channel MOS field effect transistor to be turned on, wherein the predetermined value is a turn-on voltage value of the bipolar transistor or the N-channel MOS field effect transistor.
In the self-powered circuit for a switching power supply of the present invention, the charge pump is a double boost charge pump, and is configured to generate an output voltage which is twice the voltage of the energy storage capacitor as a switching signal for controlling the on of the switching signal of the bipolar transistor or the N-channel MOS field effect transistor.
In the self-powered circuit for a switching power supply of the present invention, the double boost charge pump includes: the first capacitor, the second capacitor, the first diode, the second diode, the PMOS tube M1 and the first NMOS tube M2, wherein:
the anode of the first diode is connected with the voltage output end of the energy storage capacitor, the cathode of the first diode is connected with the anode of the second diode, the cathode of the second diode is connected with the first end of the second capacitor, and the second end of the second capacitor is grounded;
the drain electrode of the PMOS tube M1 is connected with the voltage output end of the energy storage capacitor, the source electrode of the PMOS tube M1 is connected with the drain electrode of the first NMOS tube M2, the source electrode of the first NMOS tube M2 is grounded, and the grid electrodes of the PMOS tube M1 and the first NMOS tube M2 are connected with the output end of the control circuit;
the first end of the first capacitor is connected with the source electrode of the PMOS tube M1, and the second end of the first capacitor is connected with the cathode of the first diode.
In the self-powered circuit for the switching power supply, the control circuit comprises a detection circuit for detecting the voltage of the energy storage capacitor and a signal generation circuit for generating the control signal according to the detection result.
In the self-powered circuit for a switching power supply of the present invention, the detection circuit includes a comparator, a first resistor, a second resistor, a third resistor, and a second NMOS transistor M3, the signal generation circuit includes an oscillator, wherein,
the first resistor, the second resistor and the third resistor are sequentially connected in series between the voltage output end of the energy storage capacitor and the ground, the positive input end of the comparator is connected with a reference potential, the negative input end of the comparator is connected with a node between the first resistor and the second resistor, the output end of the comparator is connected with the input end of the oscillator, and the output end of the oscillator is the output end of the control signal; the grid electrode of the second NMOS tube M3 is connected with the output end of the comparator, the source electrode is grounded, and the drain electrode is connected with a node between the second resistor and the third resistor.
The technical scheme adopted for solving the technical problems is as follows: a control chip for a switching power supply is constructed on which the switching part, the control circuit and the charge pump in the self-powered circuit for a switching power supply as described above are integrated so as to supply the operating power to the control chip using the energy storage capacitor at the time of light load or no load.
The technical scheme adopted for solving the technical problems is as follows: the switching power supply is characterized in that one end of a primary coil of the converter is connected with the self-powered circuit for the switching power supply, so that an energy storage capacitor is used for providing a working power supply for a controller of the switching power supply when the switching power supply is in light load or no load.
The technical scheme adopted for solving the technical problems is as follows: an electrical device is constructed comprising a switching power supply as described above and an operating power supply provided by the switching power supply.
An electrical device comprising a switching power supply as described above and a working power supply provided by said switching power supply.
The implementation of the invention has the following beneficial effects: when the switching power supply is in light load or no load, the output voltage of the energy storage capacitor is controlled within a preset voltage range, so that the energy storage capacitor can provide a normal working power supply for a controller or a control chip of the switching power supply, and the controller or the control chip of the switching power supply can work normally.
In addition, the self-powered circuit has a simple structure, so that the self-power of the controller or the control chip of the switching power supply can be realized in a light load or no load at low cost and effectively.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a circuit schematic of a prior art switching power converter;
FIG. 2 is a schematic circuit diagram of a self-powered circuit for a switching power supply of the present invention;
FIG. 3 is a circuit schematic of a self-powered circuit of a switching power supply according to one embodiment of the invention;
FIG. 4 is a circuit diagram of a double boost charge pump in a self-powered circuit of a switching power supply according to one embodiment of the invention;
FIG. 5 is a circuit diagram of a control circuit in a self-powered circuit of a switching power supply according to one embodiment of the invention;
FIG. 6 is a waveform diagram of node voltages of the control circuit shown in FIG. 5;
fig. 7 is a schematic diagram of the operational waveforms of the self-powered circuit for a switching power supply of the present invention.
Detailed Description
Fig. 2 is a circuit schematic of a self-powered circuit for a switching power supply of the present invention. In various embodiments of the present invention, the main switch (i.e., switch element K) is configured in the connection mode shown in fig. 2 when the switching power supply is in light load or no load.
As shown in fig. 2, the input circuit 1 is electrically connected (coupled) to the output circuit 2 through the inverter 3.
The first end of the switch component K is used for connecting the primary coil of the switching power supply converter 3, and the second end of the switch component K is grounded through the energy storage capacitor C; the energy storage capacitor C supplies power to the control circuit 4 and the charge pump 5; the control circuit 4 outputs corresponding control signals V0 to the charge pump 5 according to the voltage Vcc of the energy storage capacitor C within a preset voltage range so as to control the operation of the charge pump 5; the charge pump 5 is configured to output a switching signal Vout to a control terminal of the switching element K according to a control signal V0 of the control circuit 4, so as to control on and off of the switching element K.
Further, the control circuit 4 outputs a control signal indicating that the charge pump is operated when the voltage Vcc of the storage capacitor C falls to a first predetermined voltage Vref1, and outputs a control signal indicating that the charge pump is stopped when the voltage Vcc of the storage capacitor C rises to a second predetermined voltage Vref2, wherein the second predetermined voltage Vref2 is higher than the first predetermined voltage Vref1, and the predetermined voltage range is between the second predetermined voltage Vref2 and the first predetermined voltage Vref 1.
The specific working process is that the control circuit 4 takes electricity from the energy storage capacitor C and detects the voltage on the energy storage capacitor, when the voltage of the capacitor drops to a first preset voltage Vref1, the control circuit controls the charge pump to work, and the charge pump takes electricity from the capacitor and converts a signal higher than the voltage of the capacitor to drive the switch component K to be opened; after the switch component K is conducted, the capacitor voltage rises, when the voltage rises to a second preset voltage Vref2, the control circuit controls the charge pump to stop working, the switch component K is cut off, and the voltage of the energy storage capacitor stops rising, so that the operation is repeated. The voltage of the storage capacitor is maintained within a predetermined voltage range, i.e., a range between the first predetermined voltage Vref1 and the second predetermined voltage Vref 2.
In a preferred embodiment of the present invention, in the switching power supply circuit, the switching component K may be implemented by a bipolar transistor or an N-channel MOS field effect transistor, and the connection manner is as shown in fig. 3. In the embodiment shown in fig. 3, the collector of the bipolar transistor Q is connected to the primary winding of the converter, the emitter is connected to the storage capacitor C, and the base is connected to the output of the charge pump 5. When an N-channel MOS field effect transistor is adopted, the connection mode is as follows: the drain electrode of the N-channel MOS field effect transistor is used for being connected with the primary coil of the converter, the source electrode of the N-channel MOS field effect transistor is connected with the energy storage capacitor C, and the grid electrode of the N-channel MOS field effect transistor is connected with the output end of the charge pump 5 (not shown in the figure).
In the embodiments of the present invention, the charge pump 5 is a boost charge pump, and is configured to generate an output voltage higher than the voltage Vcc of the storage capacitor by a predetermined value as the switching signal Vout for controlling the on of the bipolar transistor Q or the N-channel MOS field effect transistor, wherein the predetermined value is the on voltage value of the bipolar transistor or the N-channel MOS field effect transistor.
In a preferred embodiment of the present invention, the charge pump 5 is a double boost charge pump, which generates an output voltage twice the voltage Vcc of the storage capacitor, and is used as the switching signal Vout for controlling the conduction of the bipolar transistor Q or the N-channel MOS field effect transistor.
Fig. 4 is a circuit diagram of a double boost charge pump in a self-powered circuit of a switching power supply according to an embodiment of the invention. As shown in fig. 4, the double boost charge pump includes: the device comprises a first capacitor C1, a second capacitor C2, a first diode D1, a second diode D2, a PMOS tube M1 and a first NMOS tube M2. The positive pole of first diode D is connected with energy storage capacitor C's voltage output, and the positive pole of second diode D2 is connected to first diode D1's negative pole, and second capacitor C2's first end (its output switch signal Vout) is connected to second diode D2's negative pole, and second capacitor C2's second ground connection. The drain electrode of the PMOS tube M1 is connected with the voltage output end of the energy storage capacitor C, the source electrode of the PMOS tube M1 is connected with the drain electrode of the first NMOS tube M2, the source electrode of the first NMOS tube M2 is grounded, and the grid electrodes of the PMOS tube M1 and the first NMOS tube M2 are connected with the output end of the control circuit 4 so as to receive a control signal V0 from the control circuit 4. The first end of the first capacitor C1 is connected with the source electrode of the PMOS tube M1, and the second end of the first capacitor C1 is connected with the cathode of the first diode D1.
In fig. 4, V0 is a control signal (e.g., a square wave signal) generated by the control circuit, V1 is a voltage at a node where the source of the PMOS transistor M1 and the drain of the first NMOS transistor M2 are connected, and V2 is a voltage at the cathode of the first diode D1 and the anode of the second diode D2. When the control signal V0 is at a high level, the PMOS transistor M1 is turned off, the first NMOS transistor M2 is turned on, the voltage V1 at the junction node between the source of the PMOS transistor M1 and the drain of the first NMOS transistor M2 is at a low level, and the storage capacitor voltage Vcc charges the first capacitor C1 through the first diode D1. When the control signal V0 changes to a low level, the PMOS transistor M1 is turned on, the first NMOS transistor M2 is turned off, V1 rises to a high level, and VCC charges the second capacitor C2 through the first capacitor C1 and the second diode D2. If diode drop is ignored, the voltage across the second capacitor C2 (i.e., the switching signal) vout=2×vcc.
Because the core part of the whole working process of the charge pump is a capacitor charging and discharging process, the most important formula is a capacitor charging and discharging formula: i=Δv=c, where T is a charge-discharge period of the capacitor, Δv is voltage fluctuation at both ends of the capacitor in each charge-discharge period, and I is a charge-discharge current.
In various embodiments of the present invention, the control circuit 4 includes a detection circuit for detecting the tank capacitor C voltage Vcc, and a signal generation circuit for generating a control signal V0 according to the detection result.
Fig. 5 is a circuit diagram of a control circuit in a self-powered circuit of a switching power supply according to an embodiment of the present invention, and fig. 6 is a waveform diagram of a node voltage of the control circuit shown in fig. 5.
As shown in fig. 5, the detection circuit includes a comparator 41, voltage dividing resistors R0, R1, R2, and a second NMOS transistor M3, and the signal generation circuit includes an oscillator 42. The first resistor R0, the second resistor R1 and the third resistor R2 are sequentially connected in series between the voltage output end of the energy storage capacitor C and the ground, the positive input end of the comparator 41 is connected with a reference potential, the negative input end of the comparator is connected with a node between the first resistor R0 and the second resistor R1, the output end of the comparator is connected with the input end of the oscillator 42, and the output end of the oscillator is the output end of the control signal V0; the grid electrode of the second NMOS tube M3 is connected with the output end of the comparator, the source electrode is grounded, and the drain electrode is connected with a node between the second resistor R1 and the third resistor R2.
The comparator 41, the first resistor R0 as a voltage dividing resistor, the second resistor R1, the third resistor R2, and the second NMOS transistor M3 constitute a typical hysteresis comparator that detects the voltage Vcc of the storage capacitor C. Vref_cp is a reference potential, va is a sampling voltage divided by a voltage dividing resistor (as shown in fig. 5), and Vb is an output of the comparator 41. As shown in fig. 6, when the voltage Vcc of the storage capacitor C is relatively low, the output Vb of the comparator 41 is at a high level, and the oscillator 42 receives the high level Vb and starts to operate to output a square wave signal; when the voltage Vcc of the storage capacitor C is relatively high, the output Vb of the comparator 41 is low, and the oscillator receives the low level Vb and stops operating to output a low level signal.
The switching element K (e.g., bipolar transistor Q or N-channel MOS field effect transistor), the control circuit 4 and the charge pump 5 in the self-powered circuit of the present invention may be integrated in a control chip (e.g., control chip 6 shown in fig. 2 and 3) for a switching power supply, so as to use the energy storage capacitor C to provide a normal operating power for the control chip of the switching power supply during light load or no load. It should be noted that, in some embodiments of the present invention, the control chip 6 may include, in addition to the above 3 modules (i.e., the switch component K, the control circuit 4, and the charge pump 5), a circuit module for controlling on/off of the switch component K and charging the storage capacitor C during heavy load.
Fig. 7 is a schematic diagram of an operation waveform of a self-powered circuit in a control chip for a switching power supply according to an embodiment of the present invention, in which the voltage Vcc on the storage capacitor decreases from a voltage higher than the second predetermined voltage Vref2 due to the loss of the internal circuit of the chip. When the Vcc voltage drops to a first preset voltage Vref1, a control signal V0 output by the control circuit is a square wave signal, the charge pump receives the square wave signal and outputs an output voltage Vout signal higher than the energy storage capacitor voltage Vcc to drive the base electrode of the triode, and the triode generates a voltage signal for amplifying the base electrode current and charging the Vcc capacitor (namely the energy storage capacitor) through the emitter electrode so that the energy storage capacitor voltage Vcc is raised; when the storage capacitor voltage Vcc rises to the second predetermined voltage Vref2, the control signal V0 outputted by the control circuit becomes low level, the charge pump stops operating, the output voltage Vout falls, the transistor stops supplying power to the storage capacitor, and the storage capacitor voltage Vcc changes from rising to falling due to power consumption of the chip, so that the storage capacitor voltage Vcc can basically be kept fluctuating between Vref1 and Vref 2.
When the VCC voltage is higher than the second predetermined voltage Vref2, the light load power supply mode is stopped, and the voltage higher than the second predetermined voltage Vref2 can be provided to the VCC by the heavy load power supply mode, so that the light load power supply mode is not interposed, when the load is gradually reduced, the heavy load power supply mode is insufficient to provide a sufficiently high voltage, the VCC voltage is reduced, and when the VCC is reduced to the first predetermined voltage Vref1, the light load power supply mode is provided to the VCC.
In the technical solution of the present invention, the first predetermined voltage Vref1 and the second predetermined voltage Vref2 are determined by the operating voltage of the chip or the circuit or the withstand voltage of the device, and in one embodiment, vref 1=4.9v and vref2=5.1v are selected.
The self-powered circuit is used in a switching power supply. The switching power supply comprises an input circuit and an output circuit which are electrically connected (coupled) through a converter, wherein one end of a primary coil of the converter is connected with the self-powered circuit for the switching power supply, so that an energy storage capacitor C is used for providing a working power supply for a controller of the switching power supply when the switching power supply is in light load or no load.
The switching power supply comprising the self-powered circuit can be applied to electric devices, such as a low-power charger, an LED lamp and the like, and the switching power supply comprising the self-powered circuit provides working power. The invention is especially suitable for the electric device which is used intermittently and still needs to supply power for the controller or the control chip of the switching power supply converter under light load or no load so as to ensure the normal operation of the controller or the control chip. For example, when the user uses the charger to fully charge the mobile phone, the mobile phone is taken away, but the charger is still connected to the AC power supply socket and not taken down, at this time, the input circuit of the switch power supply needs to be controlled by the control chip to no longer transmit electric energy to the output circuit, that is, the control chip needs the energy storage capacitor to always provide the working power supply for the energy storage capacitor, so that the output voltage Vcc of the energy storage capacitor needs to be controlled within a predetermined range.
The invention relates to a method for charging VCC capacitor (energy storage capacitor) by using main switch when transformer stops transmitting energy to output under light load or no load condition, so as to prevent the voltage of VCC capacitor from dropping below the voltage required by circuit, and the energy transmission to output terminal and the VCC charging are realized in time-sharing mode.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same according to the content of the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made with the scope of the claims should be covered by the claims.
Claims (10)
1. A self-powered circuit for a switching power supply, comprising: the switching component (K), the energy storage capacitor (C), the control circuit (4) and the charge pump (5); wherein the method comprises the steps of
The first end of the switch component (K) is used for connecting a primary coil of the switching power supply converter, and the second end of the switch component (K) is grounded through the energy storage capacitor (C);
the energy storage capacitor (C) is used for supplying power to the control circuit (4) and the charge pump (5);
the control circuit (4) outputs a corresponding control signal (V0) to the charge pump (5) within a preset voltage range according to the voltage (Vcc) of the energy storage capacitor (C) so as to control the operation of the charge pump (5);
the charge pump (5) is used for outputting a switching signal (Vout) to a control end of the switching component (K) according to a control signal (V0) of the control circuit (4) so as to control the on and off of the switching component (K); and, in addition, the method comprises the steps of,
the control circuit (4) outputs a control signal indicating that the charge pump is operated when the voltage (Vcc) of the storage capacitor (C) decreases to a first predetermined voltage (Vref 1), and outputs a control signal indicating that the charge pump is stopped when the voltage (Vcc) of the storage capacitor (C) increases to a second predetermined voltage (Vref 2) higher than the first predetermined voltage (Vref 1), the predetermined voltage range being between the second predetermined voltage (Vref 2) and the first predetermined voltage (Vref 1).
2. A self-powered circuit for a switching power supply as defined in claim 1 wherein,
the switch component (K) is a bipolar triode (Q), the collector of the bipolar triode (Q) is used for being connected with the primary coil of the converter, the emitter of the bipolar triode is connected with the energy storage capacitor (C), and the base of the bipolar triode is connected with the output end of the charge pump (5), or
The switching component (K) is an N-channel MOS field effect transistor, the drain electrode of the N-channel MOS field effect transistor is used for being connected with the primary coil of the converter, the source electrode of the N-channel MOS field effect transistor is connected with the energy storage capacitor (C), and the grid electrode of the N-channel MOS field effect transistor is connected with the output end of the charge pump (5).
3. The self-powered circuit for a switching power supply according to claim 2, wherein the charge pump (5) is a boost charge pump for generating an output voltage higher than the voltage (Vcc) of the storage capacitor (C) by a predetermined value as a switching signal (Vout) for controlling the conduction of the bipolar transistor (Q) or the N-channel MOS field effect transistor (N-channel mosfet), wherein the predetermined value is a conduction voltage value of the bipolar transistor or the N-channel MOS field effect transistor.
4. A self-powered circuit for a switching power supply according to claim 2, characterized in that the charge pump (5) is a double boost charge pump for generating an output voltage which is twice the voltage (Vcc) of the storage capacitor (C) as a switching signal (Vout) for controlling the conduction of the bipolar transistor (Q) or the N-channel MOS field effect transistor.
5. The self-powered circuit for a switching power supply of claim 4, wherein said double boost charge pump comprises: first electric capacity (C1), second electric capacity (C2), first diode (D1), second diode (D2), PMOS pipe (M1) and first NMOS pipe (M2), wherein:
the positive electrode of the first diode D is connected with the voltage output end of the energy storage capacitor (C), the negative electrode of the first diode D1 is connected with the positive electrode of the second diode D2, the negative electrode of the second diode D2 is connected with the first end of the second capacitor (C2), and the second end of the second capacitor (C2) is grounded;
the drain electrode of the PMOS tube (M1) is connected with the voltage output end of the energy storage capacitor (C), the source electrode of the PMOS tube (M1) is connected with the drain electrode of the first NMOS tube (M2), the source electrode of the first NMOS tube (M2) is grounded, and the grid electrodes of the PMOS tube (M1) and the first NMOS tube (M2) are connected with the output end of the control circuit (4);
the first end of the first capacitor (C1) is connected with the source electrode of the PMOS tube (M1), and the second end of the first capacitor (C1) is connected with the cathode of the first diode (D1).
6. Self-powered circuit for a switching power supply according to claim 1, characterized in that said control circuit (4) comprises a detection circuit for detecting the voltage (Vcc) of said storage capacitor (C), a signal generation circuit for generating said control signal (V0) according to the detection result.
7. A self-powered circuit for a switching power supply, as in claim 6, wherein said detection circuit comprises a comparator (41), a first resistor (R0), a second resistor (R1), a third resistor (R2) and a second NMOS transistor (M3), said signal generating circuit comprising an oscillator (42), wherein,
the first resistor (R0), the second resistor (R1) and the third resistor (R2) are sequentially connected in series between the voltage output end of the energy storage capacitor (C) and the ground, the positive input end of the comparator is connected with a reference potential, the negative input end of the comparator is connected with a node between the first resistor (R0) and the second resistor (R1), the output end of the comparator (41) is connected with the input end of the oscillator, and the output end of the oscillator (42) is the output end of the control signal (V0); the grid electrode of the second NMOS tube (M3) is connected with the output end of the comparator, the source electrode is grounded, and the drain electrode is connected with a node between the second resistor (R1) and the third resistor (R2).
8. A control chip for a switching power supply, characterized in that it has integrated thereon a switching element (K), a control circuit (4) and a charge pump (5) in a self-powered circuit for a switching power supply according to any one of claims 1 to 7, in order to provide the control chip with operating power using an energy storage capacitor (C) in light or no load.
9. A switching power supply comprising an input circuit and an output circuit electrically connected by a converter, wherein a primary winding of the converter is connected at one end to a self-powered circuit for a switching power supply as claimed in any one of claims 1 to 7, so as to provide a working power supply for a controller of the switching power supply using an energy storage capacitor (C) in light or no load.
10. An electrical device comprising the switching power supply of claim 9, and operating power provided by the switching power supply.
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 |
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| Publication Number | Publication Date |
|---|---|
| CN109639118A CN109639118A (en) | 2019-04-16 |
| CN109639118B true CN109639118B (en) | 2024-01-26 |
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| 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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| CN110518790B (en) * | 2019-08-28 | 2021-03-23 | 南京微盟电子有限公司 | Quick start and self-power supply system of switching power supply converter |
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| CN109639118A (en) | 2019-04-16 |
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