CN111277144A - Switching power supply circuit and voltage boosting method - Google Patents
Switching power supply circuit and voltage boosting method Download PDFInfo
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- CN111277144A CN111277144A CN202010180986.0A CN202010180986A CN111277144A CN 111277144 A CN111277144 A CN 111277144A CN 202010180986 A CN202010180986 A CN 202010180986A CN 111277144 A CN111277144 A CN 111277144A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000006641 stabilisation Effects 0.000 claims abstract description 13
- 238000011105 stabilization Methods 0.000 claims abstract description 13
- 230000000087 stabilizing effect Effects 0.000 claims description 21
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000000295 complement effect Effects 0.000 claims description 8
- 229910044991 metal oxide Inorganic materials 0.000 claims description 8
- 150000004706 metal oxides Chemical class 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a switching power supply circuit and a voltage boosting method, wherein a voltage input end is connected to a voltage reduction unit, the voltage reduction unit is connected with a negative input end of an operational amplifier circuit unit, a positive input end of the operational amplifier circuit unit is connected with a drain electrode of a power tube, a grid electrode of the power tube is connected with an output end of the operational amplifier circuit unit, a source electrode of an NM1 is grounded, the operational amplifier circuit unit is connected with an oscillator, a voltage stabilization unit is connected with the oscillator and is connected with the voltage input end, the voltage stabilization unit is connected with the oscillator and is connected with a positive input end of the operational amplifier circuit unit, a charge pump is connected with the oscillator, and an output end of. The invention can effectively provide output voltage which can enable a subsequent circuit to be normal under lower input voltage, and enables the output voltage to be more stable, thereby not only ensuring the normal work of the circuit, but also not causing the power tube NM1 to generate larger conduction resistance value, improving the reliability of the system and improving the accuracy and the design cost of the output voltage.
Description
Technical Field
The invention relates to the technical field of circuit electronics, in particular to a power supply circuit and a boosting method.
Background
Switched resistor circuits are currently used in many circuit applications. As shown in fig. 1, a conventional common switch resistor circuit adopts a power transistor NM1 as a switching transistor, and reduces the voltage of an input voltage VIN by a voltage drop of a resistor R1 to obtain an output voltage VOUT by turning on and off a control circuit NM1 in the circuit. There are problems in that:
1. if the voltage of the power supply end of the input voltage VIN is lower, the normal work of the circuit cannot be ensured;
2. when the circuit works under a high input voltage VIN, the power tube NM1 generates a large on-resistance value, which may seriously affect the accuracy and efficiency of the circuit, thereby greatly damaging the subsequent circuit and possibly causing the whole circuit to work abnormally.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the switching power supply circuit and the voltage boosting method, when the voltage of the power supply end is lower, the normal work of the circuit can be ensured, the larger conduction resistance value generated by the power tube NM1 can not be caused, the system reliability is improved, and the accuracy and the design cost of the output voltage are improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a switching power supply circuit comprises a voltage reduction unit, an operational amplifier circuit unit, a power tube NM1, an oscillator, a charge pump and a voltage stabilization unit, wherein a voltage input end is connected to one end of the voltage reduction unit, the other end of the voltage reduction unit is connected with a negative input end of the operational amplifier circuit unit, a positive input end of the operational amplifier circuit unit is connected with a drain electrode of a power tube NM1, a grid electrode of the power tube NM1 is connected with an output end of the operational amplifier circuit unit, a source electrode of the power tube NM1 is grounded, a positive input end of the operational amplifier circuit unit is connected with a second input end of the oscillator, a first input end of the oscillator and a first input end of the charge pump are connected with the voltage input end, one end of the voltage stabilization unit is connected with the first input end of the oscillator and is connected with the voltage input end, the other end of the voltage stabilization unit is connected with a second input end of the oscillator and is connected with, and a third input port of the charge pump is connected with a fourth output port of the oscillator, and an output end of the charge pump is connected with the voltage output end.
The voltage stabilizing unit is a circuit formed by a capacitor or a circuit formed by connecting the capacitor and a voltage stabilizing diode in parallel.
The voltage reduction unit is a direct-current power supply unit, the positive pole of the direct-current power supply unit is connected with the voltage input end, and the negative pole of the direct-current power supply unit is connected with the negative input end of the operational amplifier circuit unit.
The direct current power supply unit is a voltage reduction circuit formed by a resistor, or a voltage reduction circuit formed by a complementary metal oxide semiconductor, or a voltage reduction circuit formed by the resistor and the complementary metal oxide semiconductor.
The operational amplifier circuit unit is a differential operational amplifier or a secondary operational amplifier.
The oscillator is a capacitance-resistance loop.
The invention provides a voltage boosting method of a switching power supply circuit, which specifically comprises the following steps:
the voltage reduction unit inputs the input voltage after voltage reduction to the negative input end of the operational amplifier circuit unit according to the voltage value of the input voltage reduction provided by the received voltage input end, so that the operational amplifier circuit unit controls the grid of the power tube NM1, and the input voltage after voltage reduction is generated at the drain of the power tube NM 1;
the oscillator generates a voltage level signal according to the input voltage received by the first input port of the oscillator and the input voltage subjected to voltage reduction received by the second input port of the oscillator, and sends the voltage level signal to the charge pump;
the charge pump boosts the received input voltage according to the voltage level signal.
The voltage stabilizing unit maintains the voltage of the first input port of the oscillator as an input voltage, and maintains the voltage of the second input port of the oscillator as a stepped-down input voltage.
When the switching power supply circuit starts to work, when the positive input end and the negative input end of the operational amplifier circuit unit have voltage input, the power tube NM1 works in a deep triode region, the operational amplifier circuit unit applies negative feedback to the grid of the power tube NM1, the voltage of the drain electrode of the power tube NM1 is fed back to the positive input end of the operational amplifier circuit unit, and the output end of the operational amplifier circuit unit controls the power tube NM1 to be turned off.
The operational amplifier circuit unit has the advantages that the voltage reduction unit reduces the voltage value according to the input voltage provided by the received voltage input end, and inputs the input voltage after voltage reduction into the negative input end of the operational amplifier circuit unit, so that the operational amplifier circuit unit controls the grid electrode of the power tube NM1, and the input voltage after voltage reduction is generated at the drain electrode of the power tube NM 1; the charge pump raises the received input voltage according to the voltage level signal, can effectively provide the output voltage which can enable the subsequent circuit to be normal under the lower input voltage, and enables the output voltage to be more stable, thereby not only ensuring the normal work of the circuit, but also not leading the power tube NM1 to generate larger conduction resistance value, improving the reliability of the system and the accuracy and the design cost of the output voltage.
Drawings
FIG. 1 is a schematic diagram of a prior art switching power supply circuit;
FIG. 2 is a schematic diagram of a switching power supply circuit according to the present invention;
fig. 3 is a schematic diagram of a variation of the switching power supply circuit according to the embodiment of the present invention;
fig. 4 is a schematic structural variation diagram of a switching power supply circuit according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
A switching power supply circuit comprises a voltage reduction unit, an operational amplifier circuit unit, a power tube NM1, an oscillator, a charge pump and a voltage stabilization unit, wherein a voltage input end is connected to one end of the voltage reduction unit, the other end of the voltage reduction unit is connected with a negative input end of the operational amplifier circuit unit, a positive input end of the operational amplifier circuit unit is connected with a drain electrode of a power tube NM1, a grid electrode of the power tube NM1 is connected with an output end of the operational amplifier circuit unit, a source electrode of the power tube NM1 is grounded, a positive input end of the operational amplifier circuit unit is connected with a second input end of the oscillator, a first input end of the oscillator and a first input end of the charge pump are connected with the voltage input end, one end of the voltage stabilization unit is connected with the first input end of the oscillator and is connected with the voltage input end, the other end of the voltage stabilization unit is connected with a second input end of the oscillator and is connected with, and a third input port of the charge pump is connected with a fourth output port of the oscillator, and an output end of the charge pump is connected with the voltage output end.
The voltage stabilizing unit is a circuit formed by a capacitor or a circuit formed by connecting the capacitor and a voltage stabilizing diode in parallel.
The voltage reduction unit is a direct-current power supply unit, the positive pole of the direct-current power supply unit is connected with the voltage input end, and the negative pole of the direct-current power supply unit is connected with the negative input end of the operational amplifier circuit unit.
The direct current power supply unit is a voltage reduction circuit formed by a resistor, or a voltage reduction circuit formed by a complementary metal oxide semiconductor, or a voltage reduction circuit formed by the resistor and the complementary metal oxide semiconductor.
The operational amplifier circuit unit is a differential operational amplifier or a secondary operational amplifier.
The oscillator is a capacitance-resistance loop.
The invention provides a voltage boosting method of a switching power supply circuit, which comprises the following steps:
the voltage reduction unit inputs the input voltage after voltage reduction to the negative input end of the operational amplifier circuit unit according to the voltage value of the input voltage reduction provided by the received voltage input end, so that the operational amplifier circuit unit controls the grid of the power tube NM1, and the input voltage after voltage reduction is generated at the drain of the power tube NM 1;
the oscillator generates a voltage level signal according to the input voltage received by the first input port of the oscillator and the input voltage subjected to voltage reduction received by the second input port of the oscillator, and sends the voltage level signal to the charge pump;
the charge pump boosts the received input voltage according to the voltage level signal.
The voltage stabilizing unit maintains the voltage of the first input port of the oscillator as an input voltage, and maintains the voltage of the second input port of the oscillator as a stepped-down input voltage.
When the switching power supply circuit starts to work, when the positive input end and the negative input end of the operational amplifier circuit unit have voltage input, the power tube NM1 works in a deep triode region, the operational amplifier circuit unit applies negative feedback to the grid of the power tube NM1, the voltage of the drain electrode of the power tube NM1 is fed back to the positive input end of the operational amplifier circuit unit, and the output end of the operational amplifier circuit unit controls the power tube NM1 to be turned off.
Fig. 2 is a schematic structural diagram of a switching power supply circuit according to an embodiment of the present invention.
The switching power supply circuit comprises a voltage reduction unit 101, an operational amplifier circuit unit 102, a power tube NM1103, an oscillator 104, a charge pump 105 and a voltage stabilization unit 106;
the voltage input terminal is connected to one end of the voltage dropping unit 101; the other end of the voltage reduction unit 101 is connected to the negative input end of the operational amplifier circuit unit 102; the positive input end of the operational amplifier circuit unit 102 is connected to the drain of the power tube NM 1103; the gate of the power tube NM1103 is connected to the output end of the operational amplifier circuit unit 102, and the source of the power tube NM1103 is grounded; a positive input end of the operational amplifier circuit unit 102 is connected to a second input port of the oscillator 104; a first input port of the oscillator 104 and a first input port of the charge pump 105 are connected to the voltage input; one end of the voltage stabilizing unit 106 is connected to the first input port of the oscillator 104 and is connected to the voltage input end, and the other end of the voltage stabilizing unit 106 is connected to the second input port of the oscillator 104 and is connected to the positive input end of the operational amplifier circuit unit 102; a second input port of the charge pump 105 is connected to a third output port of the oscillator 104; a third input port of the charge pump 105 is connected to a fourth output port of the oscillator 104; the output of the charge pump 105 is connected to the voltage output.
The power tube NM1 is an N-channel enhancement type MOS tube, and the connection mode with other electric elements is the same as that of the power tube NM 1.
The voltage stabilizing unit 106 is a capacitor or a circuit formed by connecting a capacitor and a voltage stabilizing diode in parallel, and when the voltage stabilizing unit 106 is a capacitor, as shown in fig. 3, the capacitor C1 has a voltage stabilizing function to stabilize the voltages at the first input port and the second input port of the oscillator 104. When the voltage regulator 106 is a parallel circuit of a capacitor and a zener diode, as shown in fig. 4, the parallel circuit of the capacitor C1 and the zener diode D1 also has a voltage stabilizing function, and stabilizes the voltage at the first input port and the second input port of the oscillator 104.
The voltage reduction unit 101 is a dc power supply unit, the positive pole of the dc power supply unit is connected to the voltage input terminal, and the negative pole of the dc power supply unit is connected to the negative input terminal of the operational amplifier circuit unit 102. The dc power supply unit may function to reduce the input voltage.
The direct current power supply unit is a voltage reduction circuit formed by a resistor, or a voltage reduction circuit formed by a complementary metal oxide semiconductor, or a voltage reduction circuit formed by the resistor and the complementary metal oxide semiconductor.
The operational amplifier circuit unit 102 is a differential operational amplifier or a two-stage operational amplifier, and the oscillator is a capacitance-resistance loop. The voltage at the positive input of the operational amplifier circuit unit 102 is denoted by VP + and the voltage at the negative input is denoted by VP-.
The embodiment of the invention provides a switching power supply circuit, which comprises a voltage reduction unit 101, an operational amplifier circuit unit 102, a power tube NM1103, an oscillator 104 and a charge pump 105; the voltage input terminal is connected to one end of the voltage dropping unit 101; the other end of the voltage reduction unit 101 is connected to the negative input end of the operational amplifier circuit unit 102; the positive input end of the operational amplifier circuit unit 102 is connected to the drain of the power tube NM 1103; the gate of the power tube NM1103 is connected to the output end of the operational amplifier circuit unit 102, and the source of the power tube NM1103 is grounded; a positive input end of the operational amplifier circuit unit 102 is connected to a second input port of the oscillator 104; a first input port of the oscillator 104 and a first input port of the charge pump 105 are connected to the voltage input; a second input port of the charge pump 105 is connected to a third output port of the oscillator 104; a third input port of the charge pump 105 is connected to a fourth output port of the oscillator 104; the output end of the charge pump 105 is connected to the voltage output end, so that the output voltage which can enable a follow-up circuit to be normal can be effectively provided under the lower input voltage, the output voltage is more stable, the normal work of the circuit can be guaranteed, the power tube NM1 cannot generate a larger conduction resistance value, the system reliability is improved, and the accuracy and the design cost of the output voltage are improved.
The invention also provides a voltage boosting method, which is applied to the switching power supply circuit and comprises the following steps: the step-down unit 101 lowers a voltage value of a first preset threshold according to the received input voltage of the voltage input terminal, and inputs the stepped-down input voltage to a negative input terminal of the operational amplifier circuit unit 102, so that the operational amplifier circuit unit 102 controls a gate of the power tube NM1103, and thus the stepped-down input voltage is generated at a drain of the power tube NM 1103; one end of the voltage stabilizing unit 106 is connected to the first input port of the oscillator 104 and is connected to the voltage input end, the other end of the voltage stabilizing unit 106 is connected to the second input port of the oscillator 104 and is connected to the positive input end of the operational amplifier circuit unit 102, and the oscillator 104 generates a voltage level signal according to the input voltage received by the first input port of the oscillator 104 and the input voltage after voltage reduction received by the second input port of the oscillator 104, and sends the voltage level signal to the charge pump 105; the charge pump 105 raises the received input voltage by a second preset threshold according to the voltage level signal.
The operational amplifier circuit unit 102 is connected to the switching power supply circuit by adopting a negative feedback structure, and functions as a voltage follower, the oscillator 104 generates an oscillation signal with a high level and a low level which are switched continuously to supply power to the charge pump 105, and the charge pump 105 receives the oscillation signal with the high level and the low level which is generated by the oscillator 104 and is switched continuously, and superimposes the oscillation signal on an input voltage of the charge pump 105.
When the switching power supply circuit starts to work, when the positive input end and the negative input end of the operational amplifier circuit unit 102 have voltage input, the power tube NM1103 works in a deep triode region, and the operational amplifier circuit unit 102 applies negative feedback to the gate of the power tube NM1103, the drain voltage of the power tube NM1103 is fed back to the positive input end of the operational amplifier circuit unit 102 in time, when the gain of the operational amplifier circuit unit 102 is large enough, the differential input voltage of the operational amplifier circuit unit 102 is small, the output end of the operational amplifier circuit unit 102 controls the power tube NM1103 to be almost in an off state, and it can be ensured that the voltages of the positive input end and the negative input end of the operational amplifier circuit unit 102 are kept equal.
With reference to the schematic circuit structure provided by the embodiment of the present invention, when the input voltage provided by the voltage input terminal is, for example, Vref, the voltage dropping unit 101 provides a voltage drop of a voltage value of a first preset threshold, the first preset threshold is set according to actual requirements, the first preset threshold in this embodiment is 2.5V, so that the voltage reaching the negative input terminal of the operational amplifier circuit unit 102 is reduced by the first preset threshold 2.5V compared with the voltage of the supply voltage Vref provided by the voltage input terminal, the operational amplifier circuit unit 102 with negative feedback function controls the gate of the power tube NM1, so as to generate a stable output voltage at the drain of the power tube 1103, that is, (Vref-first preset threshold), when the input voltage Vref and the output voltage (Vref-first preset threshold) are respectively used as high and low voltages of the oscillator 104 to supply the oscillator 104, high and low level logic signals of Vref and (Vref-preset voltage value) reach the charge pump 105, the charge pump 105 boosts the input voltage Vref within the circuit to a second preset threshold and outputs the boosted input voltage Vref, where the second preset threshold is set according to actual needs, for example, boosted by 3V, to provide a working voltage higher than the input voltage Vref for a subsequently connected circuit or an electric device.
The voltage of the first input port of the oscillator 105 is maintained as the input voltage by the voltage stabilizing unit 106, and the voltage of the second input port of the oscillator 105 is maintained as the input voltage after voltage reduction, wherein the capacitive element 106 plays a role of voltage stabilization, and can stabilize the voltages of the first input port and the second input port of the oscillator 105.
When the voltage values received by the positive input end and the negative input end of the operational amplifier circuit unit 102 are equal, the output end of the operational amplifier circuit unit 102 controls the power tube NM1103 to be turned off;
when the voltage values received by the positive input terminal and the negative input terminal of the operational amplifier circuit unit 102 are not equal, the output voltage of the output terminal of the operational amplifier circuit unit 102 is grounded through the drain of the power tube NM 1103.
According to the voltage boosting method provided by the invention, a voltage reduction unit 101 reduces a voltage value of a first preset threshold according to an input voltage provided by a received voltage input end, and inputs the input voltage after voltage reduction to a negative input end of an operational amplifier circuit unit 102, so that the operational amplifier circuit unit 102 controls a grid electrode of a power tube NM1103, and the input voltage after voltage reduction is generated at a drain electrode of the power tube NM 1103; one end of the voltage stabilizing unit 106 is connected to the first input port of the oscillator 104 and is connected to the voltage input end, the other end of the voltage stabilizing unit 106 is connected to the second input port of the oscillator 104 and is connected to the positive input end of the operational amplifier circuit unit 102, and the oscillator 104 generates a voltage level signal according to the input voltage received by the first input port of the oscillator 104 and the input voltage after voltage reduction received by the second input port of the oscillator 104, and sends the voltage level signal to the charge pump 105; the charge pump 105 boosts the received input voltage by a second preset threshold according to the voltage level signal, the charge pump 105 can boost the input voltage inside the circuit and output the boosted input voltage, an operating voltage higher than the input voltage is provided for other circuits, and the output voltage is more stable. Compared with the prior art, the method provided by the invention has the advantages that the whole circuit design is simple, the on-resistance of the power tube NM1 is smaller, the efficiency of the circuit is improved, the heat generation of the circuit is reduced, and the safety of the circuit is improved to a certain extent.
Claims (9)
1. A switching power supply circuit comprises a voltage reduction unit, an operational amplifier circuit unit, a power tube NM1, an oscillator, a charge pump and a voltage stabilization unit, and is characterized in that:
in the switching power supply circuit, a voltage input end is connected to one end of a voltage reduction unit, the other end of the voltage reduction unit is connected with a negative input end of an operational amplifier circuit unit, a positive input end of the operational amplifier circuit unit is connected with a drain electrode of a power tube NM1, a grid electrode of the power tube NM1 is connected with an output end of the operational amplifier circuit unit, a source electrode of the power tube NM1 is grounded, a positive input end of the operational amplifier circuit unit is connected with a second input port of an oscillator, a first input port of the oscillator and a first input port of a charge pump are connected with the voltage input end, one end of a voltage stabilization unit is connected with the first input port of the oscillator and is connected with the voltage input end, the other end of the voltage stabilization unit is connected with the second input port of the oscillator and is connected with the positive input end of the operational amplifier circuit unit, the second input port of the charge pump is, the output terminal of the charge pump is connected to the voltage output terminal.
2. A switching power supply circuit according to claim 1, characterized in that:
the voltage stabilizing unit is a circuit formed by a capacitor or a circuit formed by connecting the capacitor and a voltage stabilizing diode in parallel.
3. A switching power supply circuit according to claim 1, characterized in that:
the voltage reduction unit is a direct-current power supply unit, the positive pole of the direct-current power supply unit is connected with the voltage input end, and the negative pole of the direct-current power supply unit is connected with the negative input end of the operational amplifier circuit unit.
4. A switching power supply circuit according to claim 3, characterized in that:
the direct current power supply unit is a voltage reduction circuit formed by a resistor, or a voltage reduction circuit formed by a complementary metal oxide semiconductor, or a voltage reduction circuit formed by the resistor and the complementary metal oxide semiconductor.
5. A switching power supply circuit according to claim 1, characterized in that:
the operational amplifier circuit unit is a differential operational amplifier or a secondary operational amplifier.
6. A switching power supply circuit according to claim 1, characterized in that:
the oscillator is a capacitance-resistance loop.
7. A voltage boosting method using the switching power supply circuit according to claim 1, characterized by comprising the steps of:
the voltage reduction unit inputs the input voltage after voltage reduction to the negative input end of the operational amplifier circuit unit according to the voltage value of the input voltage reduction provided by the received voltage input end, so that the operational amplifier circuit unit controls the grid of the power tube NM1, and the input voltage after voltage reduction is generated at the drain of the power tube NM 1;
the oscillator generates a voltage level signal according to the input voltage received by the first input port of the oscillator and the input voltage subjected to voltage reduction received by the second input port of the oscillator, and sends the voltage level signal to the charge pump; the charge pump boosts the received input voltage according to the voltage level signal.
8. The method of claim, comprising the steps of:
the voltage stabilizing unit maintains the voltage of the first input port of the oscillator as an input voltage, and maintains the voltage of the second input port of the oscillator as a stepped-down input voltage.
9. The method of claim, comprising the steps of:
when the switching power supply circuit starts to work, when the positive input end and the negative input end of the operational amplifier circuit unit have voltage input, the power tube NM1 works in a deep triode region, the operational amplifier circuit unit applies negative feedback to the grid of the power tube NM1, the voltage of the drain electrode of the power tube NM1 is fed back to the positive input end of the operational amplifier circuit unit, and the output end of the operational amplifier circuit unit controls the power tube NM1 to be turned off.
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| CN202010180986.0A CN111277144B (en) | 2020-03-16 | 2020-03-16 | Switching power supply circuit and voltage boosting method |
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| CN202010180986.0A CN111277144B (en) | 2020-03-16 | 2020-03-16 | Switching power supply circuit and voltage boosting method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882369A (en) * | 2012-10-26 | 2013-01-16 | 嘉兴禾润电子科技有限公司 | Novel charge pump circuit in chip for motor drivers |
| CN105094193A (en) * | 2014-05-04 | 2015-11-25 | 中芯国际集成电路制造(上海)有限公司 | Low differential pressure voltage stabilizer |
| US20170353156A1 (en) * | 2016-06-03 | 2017-12-07 | Synaptics Japan Gk | Oscillator circuit with low dropout regulator |
| CN109004825A (en) * | 2018-08-08 | 2018-12-14 | 福建飞毛腿动力科技有限公司 | It is a kind of to be depressured the direct-current switch power supply conversion circuit that boosted |
| CN212367130U (en) * | 2020-03-16 | 2021-01-15 | 西安拓尔微电子有限责任公司 | Switching power supply circuit |
-
2020
- 2020-03-16 CN CN202010180986.0A patent/CN111277144B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882369A (en) * | 2012-10-26 | 2013-01-16 | 嘉兴禾润电子科技有限公司 | Novel charge pump circuit in chip for motor drivers |
| CN105094193A (en) * | 2014-05-04 | 2015-11-25 | 中芯国际集成电路制造(上海)有限公司 | Low differential pressure voltage stabilizer |
| US20170353156A1 (en) * | 2016-06-03 | 2017-12-07 | Synaptics Japan Gk | Oscillator circuit with low dropout regulator |
| CN109004825A (en) * | 2018-08-08 | 2018-12-14 | 福建飞毛腿动力科技有限公司 | It is a kind of to be depressured the direct-current switch power supply conversion circuit that boosted |
| CN212367130U (en) * | 2020-03-16 | 2021-01-15 | 西安拓尔微电子有限责任公司 | Switching power supply circuit |
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| CN111277144B (en) | 2024-05-24 |
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Address after: B201, zero one square, Xi'an Software Park, 72 Keji 2nd Road, high tech Zone, Xi'an City, Shaanxi Province, 710000 Applicant after: Tuoer Microelectronics Co.,Ltd. Address before: B201, zero one square, Xi'an Software Park, 72 Keji 2nd Road, high tech Zone, Xi'an City, Shaanxi Province, 710000 Applicant before: Xi'an Tuoer Microelectronics Co.,Ltd. Address after: B201, zero one square, Xi'an Software Park, 72 Keji 2nd Road, high tech Zone, Xi'an City, Shaanxi Province, 710000 Applicant after: Xi'an Tuoer Microelectronics Co.,Ltd. Address before: B201, zero one square, Xi'an Software Park, 72 Keji 2nd Road, high tech Zone, Xi'an City, Shaanxi Province, 710000 Applicant before: XI'AN TUOER MICROELECTRONICS Co.,Ltd. |
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