CN113965052A - Switching power supply circuit, switching power supply and electronic equipment - Google Patents
Switching power supply circuit, switching power supply and electronic equipment Download PDFInfo
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- CN113965052A CN113965052A CN202111206932.8A CN202111206932A CN113965052A CN 113965052 A CN113965052 A CN 113965052A CN 202111206932 A CN202111206932 A CN 202111206932A CN 113965052 A CN113965052 A CN 113965052A
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- power supply
- detection module
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- switching power
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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
Abstract
The invention relates to the field of switching power supplies, and provides a switching power supply circuit, a switching power supply and electronic equipment, which are used for solving the problem that a power supply cannot exit a low-power-consumption mode in the traditional scheme. The circuit comprises a control module, a power level circuit, an inductance unit, a low-power-consumption opening and closing detection module, an output capacitor, a sampling switch tube, a sampling hold capacitor and a dummy load module; one end of the power level circuit and the inductance unit is connected to the first end of the control module, the other end is connected to one end of the dummy load module, one end of the output capacitor, the first end of the sampling switch tube and the first input end of the low-power-consumption closing detection module, the second end is connected to the second input end of the low-power-consumption closing detection module and one end of the sampling holding capacitor, the output end of the low-power-consumption closing detection module is connected to the second end of the control module and the control end of the sampling switch tube, the output end of the low-power-consumption opening detection module is connected to the control end of the sampling switch tube, and the input end is connected to the third end of the control module.
Description
Technical Field
The invention relates to the technical field of low-power-consumption processing of a switching power supply, in particular to a switching power supply circuit, a switching power supply and electronic equipment.
Background
At present, the standby power consumption of the switching power supply is required to be lower and lower, and the common method of the switching power supply with low power consumption is that when the load is detected to be extremely low, the switching power supply enters a low power consumption mode. In the traditional scheme, a sampling holding capacitor C1 and an MOS (metal oxide semiconductor) tube are connected at the rear end of a switching power supply, when a load is detected to be smaller than a certain set value, the switching power supply enters a low power consumption mode, the sampling MOS tube is closed, and the voltage Cvref on the sampling holding capacitor C1 is the output voltage Vout on the output capacitor Cout when the sampling MOS tube is initially closed. That is, when the low power consumption mode is initially entered, Cvref is equal to Vout, and when the output voltage Vout is lower than the reference voltage generated by Cvref, the low power consumption mode is exited.
The inventor finds that, in the above scheme, the output capacitor Cout is likely not to have a load, and the sample-and-hold capacitor C1 cannot be too large due to cost limitation, which results in non-negligible weak leakage of the process itself, and when the output capacitor Cout has no load and the sample-and-hold capacitor process has non-negligible weak leakage, the output voltage Vout may be caused to fall faster than the output voltage Vout, so that the output voltage Vout may be higher than the reference voltage generated by Cvref, and finally the low power consumption mode cannot be exited, and the practicability is low.
Disclosure of Invention
The invention aims to provide a switching power supply circuit, a switching power supply and electronic equipment, and aims to solve the technical problems that a power supply cannot exit a low-power-consumption mode and is low in practicability in the traditional scheme.
A switching power supply circuit comprises a control module, a power level circuit, an inductance unit, a low-power-consumption opening detection module, a low-power-consumption closing detection module, an output capacitor, a sampling switch tube, a sampling holding capacitor and a dummy load module;
wherein, the first end of control module is connected to the one end of power level circuit, the other end of power level circuit is connected to the one end of inductance unit, the other end of inductance unit be connected to the one end of dummy load module, the one end of output capacitance the first end of sampling switch tube and the first input of detection module is closed to the low-power consumption, the second end of sampling switch tube is connected to the second input of detection module is closed to the low-power consumption and the one end of sample hold capacitor, the output of detection module is closed to the low-power consumption is connected to the second end of control module and the control end of sampling switch tube
The output end of the low-power-consumption starting detection module is connected to the control end of the sampling switch tube, the input end of the low-power-consumption starting detection module is connected to the third end of the control module, and the other ends of the output capacitor and the sampling holding capacitor are connected to the ground end.
In one embodiment, the dummy load module comprises a current source, one end of the current source is used as one end of the dummy load module, and the other end of the current source is connected to the ground terminal.
In one embodiment, a value of the current source is associated with an output voltage of the switching power supply.
In one embodiment, the dummy load module includes a resistor unit, one end of the resistor unit is one end of the dummy load module, and the other end of the resistor unit is connected to the ground terminal.
In one embodiment, the resistance value of the resistance unit is related to the output voltage of the switching power supply.
In an embodiment, the low power consumption turn-on detection module includes a first comparator, an input of the first comparator is used as an input of the low power consumption turn-on detection module, and an output of the first comparator is used as an output of the low power consumption turn-on detection module.
In an embodiment, the low power shutdown detection module includes a second comparator, a first input of the second comparator is used as the first input of the low power shutdown detection module, a second input of the second comparator is used as the second input of the low power shutdown detection module, and an output of the second comparator is used as the output of the low power shutdown detection module.
In one embodiment, the sampling switch tube is a PMOS field effect transistor.
A switching power supply comprising a switching power supply circuit as claimed in any preceding claim.
An electronic device comprising the switching power supply of any one of the preceding claims, or comprising the switching power supply circuit of any one of the preceding claims.
After the switching power supply enters the low power consumption mode, the output capacitor Cout may or may not have a load. When the output capacitor Cout has a load, the voltage Vout will slowly drop due to the load. When the low power off detection module detects that Vout is less than the reference voltage generated by Cvref, the low power mode is exited, and the sampling switch Q is turned back on to connect the sample-and-hold capacitor C1 and the output capacitor Cout. When the load of the output capacitor Cout is 0, that is, the output capacitor Cout does not have a load, the output voltage Vout can be effectively ensured due to the existence of the dummy load module 105, and the drop speed is faster than that of the output capacitor Cout without the dummy load module 105.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a switching power supply circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a dummy load module according to an embodiment of the present invention;
fig. 3 is another schematic structural diagram of a dummy load module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
As shown in fig. 1, an embodiment of the present application provides a switching power supply circuit, which is used in a switching power supply, and the switching power supply circuit includes a control module 101, a power stage circuit and an inductance unit 102, a low power consumption on detection module 103, a low power consumption off detection module 104, an output capacitor Cout, a sampling switch Q, a sample-and-hold capacitor C1, and a dummy load module 105.
Wherein, the first end of the control module 101 is connected to one end of the power stage circuit, the other end of the power stage circuit is connected to one end of the inductance unit, the other end of the inductance unit is connected to one end of the dummy load module 105, one end of the output capacitor Cout, the first end of the sampling switch tube P and the first input end of the low power consumption turn-off detection module 104, in fig. 1, for the sake of simplified description, the power stage circuit and the inductance unit are represented by a block diagram 102, that is, the first end of the control module 101 is connected to one end of the power stage circuit and the inductance unit 102, the other end of the power stage circuit and the inductance unit 102 is connected to one end of the dummy load module 105, one end of the output capacitor Cout, the first end of the sampling switch tube Q and the first input end of the low power consumption turn-off detection module 104, the second end of the sampling switch tube Q is connected to the second input end of the low power consumption turn-off detection module 104 and one end of the sampling hold capacitor C1, the output end (LPM _ out) of the low power consumption shutdown detection module 104 is connected to the second end of the control module 101 and the control end of the sampling switch tube Q;
a first end (LPM _ in) of the low power consumption start detection module 103 is connected to the control end of the sampling switch tube P, a second end of the low power consumption start detection module 103 is connected to the third end of the control module 101, and the other ends of the output capacitor Cout and the sample-hold capacitor C1 are both connected to the ground.
In this embodiment, the low power consumption turn-on detection module 103 is configured to detect load information of the switching power supply in real time. When the load information is detected to be less than a certain set value, the control module controls the switching power supply to enter a low power consumption mode, and the entering of the low power consumption mode includes but is not limited to executing the following operations: all power consuming modules except the low power shutdown detection module 104, and/or the dummy load module 105 are shut down. When the low power consumption mode is entered, so that the sampling switch tube Q is turned off, the voltage Cvref across the sampling hold capacitor C1 is Vout when the sampling switch tube Q is initially turned off. That is, when the low power consumption mode is initially entered, Cvref is equal to Vout.
After the switching power supply enters the low power consumption mode, the output capacitor Cout may or may not have a load. When the output capacitor Cout has a load, the voltage Vout will slowly drop due to the load. When the low power off detection module 104 detects that Vout is less than the reference voltage generated by Cvref, the low power mode is exited, and the sampling switch Q is turned back on to connect the sample-and-hold capacitor C1 and the output capacitor Cout. When the load of the output capacitor Cout is 0, that is, the output capacitor Cout has no load, the output voltage Vout can be effectively ensured due to the dummy load module 105, and the falling speed is faster than that in the case of not having the dummy load module 105.
It should be noted that, because the dummy load module 105 exists, in order to avoid increasing the power consumption in the low power consumption mode, the dummy load module 105 cannot be too large, and therefore, in order to further avoid that the output voltage VOUT drops very slowly, and ensure that the dropping speed of the output voltage VOUT is much greater than Cvref, this embodiment needs to reasonably consider the weak leakage of the sample-and-hold capacitor C1 process itself and the value of the sample-and-hold capacitor C1.
For example, in general, the output capacitor Cout may take a value of about 10uF, and the dummy load module 105 may take a value of about 10 nA. The weak leakage of the process itself can typically be estimated to be around 10fA for the sample-and-hold capacitor C1. In summary, when the sample-and-hold capacitor C1 takes the value of 10pF, the falling speed of the output voltage Vout will be the same as Cvref, and in order to ensure that the falling speed of the output voltage Vout is always much larger than Cvref, the sample-and-hold capacitor C1 may take the value of more than 100pF, or raise the dummy load module to about 20nA, which is not limited specifically.
It can be seen that, in this embodiment, by adding the dummy load module 105, the falling speed of the output voltage Vout can be made greater than that of the Cvref, which effectively avoids the situation that the voltage Cvref falls faster, so that the switching power supply can successfully exit the low power consumption mode, improves the practicability and reliability, and can also take into account the cost and power consumption by reasonably configuring the values of the sample hold capacitor C1 and the dummy load module.
In one embodiment, as shown in fig. 2, the dummy load module 105 includes a current source I1, and specifically, the dummy load module 105 is implemented by a current source I1, wherein one terminal of the current source I1 is used as one terminal of the dummy load module 105, and the other terminal of the current source I1 is connected to ground.
In one embodiment, as discussed above, to ensure that the falling speed of the output voltage Vout is always much greater than Cvref, the current source is related to the output voltage of the switching power supply, and the current source can range from 10nA to 20nA, so that the falling speed of the output voltage Vout is always much greater than Cvref.
It should be noted that in some embodiments, the current source I1 may be a current source generated by using a current mirror, and the current mirror may be generated from other modules of the switching power supply circuit, for example, when the low power shutdown detection module 104 includes a current mirror, the current source I1 may be generated from the current mirror in the low power shutdown detection module 104, and is not limited in particular.
In one embodiment, as shown in fig. 3, the dummy load module includes a resistor unit R, and specifically, the dummy load module employs the resistor unit R, wherein one end of the resistor unit R is an end of the dummy load module 105, and the other end of the resistor unit R1 is connected to the ground.
In one embodiment, as described in the foregoing analysis, in order to ensure that the falling speed of the output voltage Vout is always much greater than Cvref, the resistance of the resistor unit R is related to the output voltage of the switching power supply, and the resistance of the resistor unit R can be adjusted according to the voltage of Vout, for example, in order to make the power consumption of the resistor unit R be 10nA or more, for example, if Vout is 1V, the resistor unit R can take 100 mhs to determine that the power consumption is 10nA or more.
In an embodiment, the low power consumption turn-on detection module 103 includes a first comparator, and specifically, the low power consumption turn-on detection module 103 is a first comparator, a first end of the first comparator is used as a first end of the low power consumption turn-on detection module 103, a second end of the first comparator is used as a second end of the low power consumption turn-on detection module 103, the first end of the first comparator is connected to the control end of the sampling switch Q, and the second end of the second comparator is connected to the control module 101.
In an embodiment, the low power shutdown detection module 104 includes a second comparator, and specifically, the low power shutdown detection module 104 is a second comparator, a first input of the second comparator is used as a first input of the low power shutdown detection module 104, a second input of the second comparator is used as a second input of the low power shutdown detection module 104, and an output of the second comparator is used as an output of the low power shutdown detection module 104.
Wherein the second comparator has a first input terminal for receiving the output voltage Vout, a second input terminal for receiving the voltage Cvref, and a first comparator for comparing the output Vout with a reference voltage generated by Cvref, illustratively, the reference low voltage generated by Cvref is lower than Cvref by tens of mV, and may typically be about 20 mV. The LPM _ out signal is output to the control module 101 or the sampling switch Q through the output terminal, and the sampling switch Q is turned on or off according to the LPM _ out signal.
It can be understood that, in this embodiment, the low power consumption shutdown detection module 104 is a second comparator, the power consumption of the comparator is about 40nA, while the dummy load module 105 in this embodiment is a current source I1 or a resistance unit R, the power consumption is not too large, the requirement that the drop speed of the output voltage Vout is always much greater than Cvref is met, and the requirement of lower static power consumption during the normal operation of the DCDC can be met.
It should be noted that, in the foregoing embodiment, the low-power-consumption on detection module 103 and the low-power-consumption off detection module 104 are implemented by comparators, and in other embodiments, other alternative comparison circuits may also be implemented, and the present application is not limited specifically.
In one embodiment, the sampling switch Q may be a PMOS fet, with a D pole of the PMOS fet serving as a first terminal of the sampling switch, an S pole serving as a second terminal of the sampling switch, and a G pole serving as a control terminal of the sampling switch. It should be noted that the sampling switch transistor Q may also be implemented by other alternative switch transistors, such as a junction field effect transistor, and the application is not limited thereto.
In an embodiment, a switching power supply is provided, which includes a switching power supply circuit according to any one of the foregoing embodiments, and the switching power supply circuit can be applied to various types of switching power supplies, for example, a DC-DC switching power supply or other types of switching power supplies, without limitation.
In an embodiment, an electronic device is provided, which may be a wearable device, such as a bracelet, a helmet, or other electronic devices requiring low power consumption, and particularly, but not limited to, the electronic device includes the switching power supply as mentioned in the foregoing, or the electronic device includes the switching power supply circuit as mentioned in any one of the foregoing embodiments.
In this embodiment, because electronic equipment such as wearable equipment has adopted the switching power supply circuit that this application embodiment used, can keep the working property of its power effectively, confirm that electronic equipment can normally get into the low-power mode, also can normally withdraw from the low-power mode for the electronic equipment who uses this switching power supply circuit has stronger reliability and practicality.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A switching power supply circuit is characterized by comprising a control module, a power level circuit, an inductance unit, a low-power-consumption opening detection module, a low-power-consumption closing detection module, an output capacitor, a sampling switch tube, a sampling holding capacitor and a dummy load module;
wherein, the first end of control module is connected to the one end of power level circuit, the other end of power level circuit is connected to the one end of inductance unit, the other end of inductance unit be connected to the one end of dummy load module, the one end of output capacitance the first end of sampling switch tube and the first input of detection module is closed to the low-power consumption, the second end of sampling switch tube is connected to the second input of detection module is closed to the low-power consumption and the one end of sample hold capacitor, the output of detection module is closed to the low-power consumption is connected to the second end of control module and the control end of sampling switch tube
The output end of the low-power-consumption starting detection module is connected to the control end of the sampling switch tube, the input end of the low-power-consumption starting detection module is connected to the third end of the control module, and the other ends of the output capacitor and the sampling holding capacitor are connected to the ground end.
2. The switching power supply circuit according to claim 1, wherein the dummy load module includes a current source having one end as one end of the dummy load module, and the other end of the current source is connected to the ground terminal.
3. The switching power supply circuit according to claim 2, wherein a value of the current source is associated with an output voltage of the switching power supply.
4. The switching power supply circuit according to claim 1, wherein the dummy load module includes a resistance unit, one end of the resistance unit is one end of the dummy load module, and the other end of the resistance unit is connected to the ground terminal.
5. The switching power supply circuit according to claim 4, wherein a resistance value of the resistance unit is related to an output voltage of the switching power supply.
6. The switching power supply circuit according to any one of claims 1 to 5, wherein the low power consumption turn-on detection module comprises a first comparator, an input terminal of the first comparator is used as an input terminal of the low power consumption turn-on detection module, and an output terminal of the first comparator is used as an output terminal of the low power consumption turn-on detection module.
7. The switching power supply circuit according to any one of claims 1 to 5, wherein the low power shutdown detection module comprises a second comparator, a first input terminal of the second comparator is used as a first input terminal of the low power shutdown detection module, a second input terminal of the second comparator is used as a second input terminal of the low power shutdown detection module, and an output terminal of the second comparator is used as an output terminal of the low power shutdown detection module.
8. The switching power supply circuit according to any one of claims 1 to 5, wherein the sampling switch transistor is a PMOS field effect transistor.
9. A switching power supply, characterized in that it comprises a switching power supply circuit according to any one of claims 1-8.
10. An electronic device comprising a switching power supply according to claim 9, or comprising a switching power supply circuit according to any one of claims 1-8.
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| CN202111206932.8A CN113965052B (en) | 2021-10-15 | 2021-10-15 | Switching power supply circuit, switching power supply, and electronic device |
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| CN202111206932.8A CN113965052B (en) | 2021-10-15 | 2021-10-15 | Switching power supply circuit, switching power supply, and electronic device |
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| US20130300381A1 (en) * | 2012-05-11 | 2013-11-14 | Delta Electronics, Inc. | Power converter apparatus |
| CN103425056A (en) * | 2012-05-15 | 2013-12-04 | 珠海格力电器股份有限公司 | Quasi-zero power consumption standby control circuit device and control method |
| CN106533214A (en) * | 2016-12-21 | 2017-03-22 | 无锡硅动力微电子股份有限公司 | Switching power supply converter control circuit and control method thereof |
| CN108933520A (en) * | 2018-07-19 | 2018-12-04 | 启攀微电子（上海）有限公司 | A kind of super low-power consumption DCDC Switching Power Supply |
| CN110190655A (en) * | 2019-06-28 | 2019-08-30 | 斯泰宝机电科技(昆山)有限公司 | A kind of electric tool control device, electric tool and control method |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130300381A1 (en) * | 2012-05-11 | 2013-11-14 | Delta Electronics, Inc. | Power converter apparatus |
| CN103425056A (en) * | 2012-05-15 | 2013-12-04 | 珠海格力电器股份有限公司 | Quasi-zero power consumption standby control circuit device and control method |
| CN106533214A (en) * | 2016-12-21 | 2017-03-22 | 无锡硅动力微电子股份有限公司 | Switching power supply converter control circuit and control method thereof |
| CN108933520A (en) * | 2018-07-19 | 2018-12-04 | 启攀微电子（上海）有限公司 | A kind of super low-power consumption DCDC Switching Power Supply |
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