CN115001102A - Power supply control circuit, power supply system and power supply method - Google Patents
Power supply control circuit, power supply system and power supply method Download PDFInfo
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- CN115001102A CN115001102A CN202210714113.2A CN202210714113A CN115001102A CN 115001102 A CN115001102 A CN 115001102A CN 202210714113 A CN202210714113 A CN 202210714113A CN 115001102 A CN115001102 A CN 115001102A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00308—Overvoltage protection
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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
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Abstract
The embodiment of the application discloses a power supply control circuit, a power supply system and a power supply method. The power supply control circuit comprises a voltage converter and an overvoltage protection module; the input end of the voltage converter and the input end of the overvoltage protection module are respectively connected with the power supply module; the output end of the voltage converter and the output end of the overvoltage protection module are respectively connected with load equipment; the power supply module is used for providing input power supply voltages with various numerical values for the voltage converter and the overvoltage protection module; the overvoltage protection module is used for outputting the input power supply voltage to the load equipment when the input power supply voltage is less than or equal to a preset value; wherein the voltage converter is in an off state. The overvoltage protection module outputs the input power supply voltage meeting the conditions (less than or equal to the preset value) in various numerical values, a buck-boost conversion circuit with a complex circuit structure is not needed, software equipment is not needed to be combined, and the complexity of the circuit structure is reduced.
Description
Technical Field
The present application relates to the field of circuit technologies, and in particular, to a power supply control circuit, a power supply system, and a power supply method.
Background
With the development of circuit technology, in the circuit power supply design of electronic equipment, dual power supply or multiple power supply is generally adopted, for example, electronic equipment with a battery consumes a part of power from the battery and a part of power can be consumed by an external power supply when the electronic equipment works.
In the prior art, in order to solve the problem of inconsistent voltage caused by multi-voltage power supply, a voltage conversion circuit is required to be added, and the voltage conversion circuit generally adopts a direct current-direct current buck-boost converter (namely a DC-DC buck-boost converter) and has the functions of raising, passing through and lowering the voltage. When power is supplied through the voltage conversion circuit, the input power supply voltage is detected through software equipment, and the function of the DC-DC buck-boost converter is called according to the relation between the input power supply voltage and the target power supply voltage, so that the technical scheme of boosting, directly connecting and reducing the input power supply voltage is realized, and the aim of outputting the target power supply voltage is fulfilled.
However, in the prior art, the DC-DC buck-boost converter has more functions, and needs to implement the buck-boost conversion process through software auxiliary control, which increases the complexity of the circuit structure.
Disclosure of Invention
The embodiment of the application provides a power supply control circuit, a power supply system and a power supply method, which reduce the complexity of a circuit structure.
The technical scheme of the embodiment of the application is realized as follows:
in a first aspect, an embodiment of the present application provides a power supply control circuit, where the power supply control circuit includes: the device comprises a voltage converter and an overvoltage protection module; the input end of the voltage converter and the input end of the overvoltage protection module are respectively connected with a power supply module; the output end of the voltage converter and the output end of the overvoltage protection module are respectively connected with load equipment; the power supply module is used for providing input power supply voltages with various values for the voltage converter and the overvoltage protection module; the overvoltage protection module is used for outputting the input power supply voltage to the load equipment when the input power supply voltage is less than or equal to a preset value; wherein the voltage converter is in an off state.
In a second aspect, an embodiment of the present application provides a power supply system, including: a power supply module and a power supply control circuit as described in the first aspect; the power supply module is connected with the input end of the power supply control circuit.
In a third aspect, an embodiment of the present application provides a power supply method, where the method is applied to a power supply system and the load device, where the power supply system includes an overvoltage protection module; the method comprises the following steps: acquiring an input power supply voltage; and when the input power supply voltage is smaller than or equal to a preset value, the input power supply voltage is controlled by the overvoltage protection module to be directly output to the load equipment.
The embodiment of the application provides a power supply control circuit, a power supply system and a power supply method. According to the scheme provided by the embodiment of the application, the power supply control circuit comprises: the device comprises a voltage converter and an overvoltage protection module; the input end of the voltage converter and the input end of the overvoltage protection module are respectively connected with the power supply module; the output end of the voltage converter and the output end of the overvoltage protection module are respectively connected with load equipment; the power supply module is used for providing input power supply voltages with various numerical values for the voltage converter and the overvoltage protection module; the overvoltage protection module is used for outputting the input power supply voltage to the load equipment when the input power supply voltage is less than or equal to a preset value; wherein the voltage converter is in an off state. The overvoltage protection module has a voltage stabilization characteristic, when the input power supply voltage is smaller than or equal to a preset value, the input power supply voltage does not need to pass through the voltage converter, the voltage converter is in a closed state (the enabling end of the voltage converter does not receive a signal), and the input power supply voltage is directly output. The input power supply voltage meeting the conditions (less than or equal to the preset value) in various numerical values is output through the hardware circuit, a buck-boost conversion circuit with a complex circuit structure is not needed, software equipment is not needed to be combined, and the complexity of the circuit structure is reduced.
Drawings
Fig. 1 is an alternative schematic structure diagram of a power supply control circuit according to an embodiment of the present disclosure;
fig. 2 is an alternative schematic structure diagram of another power supply control circuit provided in an embodiment of the present application;
fig. 3 is an alternative schematic structure diagram of a power supply control circuit according to an embodiment of the present disclosure;
fig. 4 is an alternative schematic structure diagram of another power supply control circuit provided in the embodiment of the present application;
fig. 5 is an alternative schematic structure diagram of another power supply control circuit provided in the embodiment of the present application;
fig. 6 is an alternative schematic structural diagram of a power supply system according to an embodiment of the present disclosure;
fig. 7 is an alternative schematic structure diagram of another power supply system provided in the embodiment of the present application;
fig. 8 is a flowchart illustrating optional steps of a power supply method according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be understood that some of the embodiments described herein are only for explaining the technical solutions of the present application, and are not intended to limit the technical scope of the present application.
In order to better understand the power supply control circuit provided in the embodiment of the present application, before describing the technical solution of the embodiment of the present application, an application background is described.
A Direct Current (DC) power supply means a Current whose direction is kept constant, for example, a dry battery or a vehicle-mounted battery. Volts (V) represents a unit of voltage, and if one DC voltage (3.0V) can be converted into another DC voltage (1.5V or 5.0V) by one converter, the converter is a DC-D voltage converter, and may also be referred to as a switching power supply or a switching regulator.
A DC-DC voltage converter is a circuit that converts an input voltage (which may also be referred to as an input power supply voltage) that is a fixed voltage or varies within a certain range into another fixed voltage, and generally includes a step-up (where the input voltage is smaller than the output voltage), a step-down (where the input voltage is greater than the output voltage), and a step-up and step-down (where the input voltage is greater than, equal to, or less than the output voltage) depending on the input voltage and the output voltage (which may also be referred to as an output power supply voltage). That is, the DC-DC voltage converter includes three types: step-up DC-DC voltage converters, step-down DC-DC voltage converters, and step-up and step-down DC-DC converter voltages. In the related art, the DC-DC buck-boost converter has more functions and a complex circuit structure, the voltage conversion circuit needs to spend more cost, and the extra functions easily cause higher energy consumption of the electronic device.
In an actual circuit, voltage reduction or voltage boosting is often needed, and the number of circuits needing voltage reduction or voltage boosting is small. Based on this, two application scenarios are described, in the first application scenario, the input voltage is greater than or equal to the output voltage, and since the input voltage is equal to the output voltage, the voltage reduction processing cannot be simply performed by the step-down DC-DC voltage converter, and the voltage conversion still needs to be performed by the DC-DC step-up/step-down converter in the circuit; in the second application scenario, the input voltage is less than or equal to the output voltage, and because the input voltage is equal to the output voltage, the boost type DC-DC voltage converter cannot simply perform the boost processing, and the DC-DC buck-boost converter still needs to be adopted in the circuit for performing the voltage conversion. In the two application scenarios, the first application scenario has a wider application range than the second application scenario, that is, there are many application scenarios in which the input voltage is greater than or equal to the output voltage. Therefore, the embodiment of the application provides a power supply control circuit, and for a second application scenario, the output of the input power supply voltage meeting the condition (less than or equal to the preset value) in multiple values is realized by designing a hardware circuit, a buck-boost conversion circuit with a complex circuit structure is not needed, a software device is not needed, and the complexity of the circuit structure is reduced.
An embodiment of the present application provides a power supply control circuit, as shown in fig. 1, and fig. 1 is an optional schematic structural diagram of the power supply control circuit provided in the embodiment of the present application. The power supply control circuit 10 includes: a voltage converter 11 and an overvoltage protection module 12; the input end of the voltage converter 11 and the input end of the overvoltage protection module 12 are respectively connected with the power supply module 20; the output end of the voltage converter 11 and the output end of the overvoltage protection module 12 are respectively connected with the load device 30; a power supply module 20, configured to provide input power supply voltages with various values to the voltage converter 11 and the overvoltage protection module 12; the overvoltage protection module 12 is configured to output the input power supply voltage to the load device 30 when the input power supply voltage is less than or equal to a preset value; wherein the voltage converter 11 is in the off-state.
In the embodiment of the present application, when the input power supply voltage is equal to the preset value, the overvoltage protection module 12 does not operate (may also be understood as not functioning), the through function is turned on, and the input power supply voltage is directly output to obtain the output power supply voltage; due to the energy losses of other devices in the overvoltage protection module 12, the output supply voltage is approximately equal to the input supply voltage, which is used to power the load device 30.
In the embodiment of the application, when the input power supply voltage is greater than the preset value, a power supply control method can be realized by adopting software equipment; illustratively, the input power supply voltage is detected by the software device, and when the input power supply voltage is greater than a preset value, an enable signal is sent to the voltage converter 11; the voltage converter 11 is turned on by the enable signal to step down the input power supply voltage to obtain the target power supply voltage. When the input power supply voltage is greater than the preset value, a power supply control method can also be realized by adopting hardware equipment; illustratively, when the input supply voltage is greater than a preset value, the overvoltage protection module 12 sends an enable signal to the voltage converter 11; the voltage converter 11 is turned on by the enable signal to step down the input power supply voltage to obtain the target power supply voltage. No matter software control or hardware control, the voltage reduction processing of the input power supply voltage can be realized, so that the input power supply voltage meeting the conditions (smaller than or equal to the preset value) in various numerical values is output, the input power supply voltage meeting the conditions (larger than the preset value) in various numerical values is output after being reduced, a voltage reduction and conversion circuit with a complex circuit structure is not needed, and the complexity of the circuit structure is reduced.
In the embodiment of the present application, based on the above description, when the input power supply voltage is equal to the preset value, the voltage converter 11 is in the off state, which may be understood that the enable terminal of the voltage converter 11 does not receive the enable signal sent by the software device or the overvoltage protection module 12.
According to the solution provided in the embodiment of the present application, the power supply control circuit 10 includes: a voltage converter 11 and an overvoltage protection module 12; the input end of the voltage converter 11 and the input end of the overvoltage protection module 12 are respectively connected with the power supply module 20; the output end of the voltage converter 11 and the output end of the overvoltage protection module 12 are respectively connected with the load device 30; the power supply module 20 is used for providing input power supply voltages with various values to the voltage converter 11 and the overvoltage protection module 12; the overvoltage protection module 12 is configured to output the input power supply voltage to the load device 30 when the input power supply voltage is less than or equal to a preset value; wherein the voltage converter 11 is in the off-state. The overvoltage protection module 12 has a voltage stabilizing characteristic, and when the input power supply voltage is less than or equal to the preset value, the input power supply voltage does not need to pass through the voltage converter 11, and the voltage converter 11 is in an off state (the enable terminal of the voltage converter 11 does not receive a signal), and directly outputs the input power supply voltage. The input power supply voltage meeting the conditions (less than or equal to the preset value) in various numerical values is output through the hardware circuit, a buck-boost conversion circuit with a complex circuit structure is not needed, software equipment is not needed to be combined, and the complexity of the circuit structure is reduced.
In some embodiments, as shown in fig. 2, fig. 2 is an alternative structural schematic diagram of another power supply control circuit provided in the embodiments of the present application. On the basis of fig. 1, the control terminal of the overvoltage protection module 12 is connected to the enable terminal of the voltage converter 11; the overvoltage protection module 12 is further configured to send a first enable signal to the voltage converter 11 when the input supply voltage is greater than a preset value; the voltage converter 11 is configured to be turned on under the action of the first enable signal, step down the input power supply voltage to obtain a target power supply voltage, and output the target power supply voltage to the load device 30; the target supply voltage is less than or equal to a preset value.
In the embodiment of the present application, the overvoltage protection module 12 is configured to control one of the voltage converter 11 to be turned on and the direct current to be turned off according to a relationship between the input power supply voltage and the preset value. When the input power supply voltage is greater than the preset value, the overvoltage protection module 12 turns off the through function and sends a first enable signal to the voltage converter 11; the voltage converter 11 is conducted under the action of the first enabling signal, and the input power supply voltage is reduced through the voltage converter 11 to obtain a target power supply voltage; the target supply voltage is less than the input supply voltage, and the target supply voltage is used to power the load device 30.
In the embodiment of the present application, the preset value represents the threshold voltage of the overvoltage protection module 12, the overvoltage protection module 12 has a voltage stabilization characteristic, and when the input power supply voltage is less than or equal to the threshold voltage, the overvoltage protection module 12 does not function (which corresponds to a pass-through function); the overvoltage protection module 12 is active when the input supply voltage is greater than the threshold voltage (which corresponds to sending a first enable signal to the voltage converter 11).
In the embodiment of the present application, the preset value may be set according to the target power supply voltage and the threshold voltage level, in general, the threshold voltage of the overvoltage protection module 12 has more parameters, generally 0.1V is a level, and the preset value is higher than the target power supply voltage by one level. Illustratively, the target supply voltage required in the circuit is 5V, the threshold voltage step of the overvoltage protection module 12 is 0.1V, and the preset value may be set to 5.1V. In this case, when the input power supply voltage is less than or equal to 5.1V, the output is directly output, the resulting output power supply voltage is 5.1V, and the output power supply voltage is approximately equal to the target power supply voltage. And when the input power supply voltage is more than 5.1V, carrying out voltage reduction treatment on the input power supply voltage to obtain a target power supply voltage, namely 5V.
In the embodiment of the present application, the preset value may be set according to the distribution information of the input power supply voltage and the target power supply voltage. Typically, the input supply voltage is not continuously distributed in the circuit, since the input supply voltage of the multiple supply branches in the power supply module 20 has several finite fixed voltage values. Illustratively, the target supply voltage required in the circuit is 5V, and the input supply voltage in the circuit may include 5V, 9V, 15V and 20V, so the preset value may be set to any one of voltages between 5V and 9V, for example, the preset value may be set to 6V, 7V or 8V. In this case, when the input supply voltage is 5V, the output is directly output, the obtained output supply voltage is 5V, and the output supply voltage is approximately equal to the target supply voltage by adding the energy loss of the device. When the input power supply voltage is 9V, 15V or 20V, it is subjected to a step-down process to obtain a target power supply voltage, i.e., 5V.
In the embodiment of the present application, when the input power supply voltage is greater than the preset value, the voltage converter 11 is enabled by the hardware circuit (i.e., the overvoltage protection module 12), so as to step down the input power supply voltage, and the voltage converter 11 only needs to have a step-down function without combining software equipment, thereby reducing the complexity of the circuit structure compared with a DC-DC step-up/step-down converter with a complex structure and multiple functions.
In some embodiments, the voltage converter 11 is a DC-DC buck converter.
In the embodiment of the present application, the DC-DC buck converter is used to convert the input power supply voltage into a stable output voltage (i.e., a target output voltage) to supply power to the load device 30.
In some embodiments, fig. 3 is an alternative schematic structural diagram of a power supply control circuit provided in the embodiments of the present application, as shown in fig. 3. On the basis of fig. 1 or fig. 2, the overvoltage protection module 12 includes a through switch circuit 121 and a voltage stabilizing circuit 122, and the preset value represents a breakdown voltage value of the voltage stabilizing circuit 122; the input end of the through switch circuit 121 and the first end of the voltage stabilizing circuit 122 are respectively connected with the power supply module 20; the output terminal of the through switch circuit 121 is connected to the load device 30; the second end of the voltage stabilizing circuit 122 is connected to the switch end of the through switch circuit 121, and the control end of the voltage stabilizing circuit 122 is connected to the enable end of the voltage converter 11; and a voltage stabilizing circuit 122 for controlling one of the voltage converter 11 and the through switch circuit 121 to be in an operating state at the same time.
In some embodiments, the voltage stabilizing circuit 122 is configured to control the pass-through switch circuit 121 to be turned on and the voltage converter 11 to be in an off state when the input supply voltage is less than or equal to the preset value, so that the input supply voltage is output to the load device 30 through the pass-through switch circuit 121; alternatively, when the input power supply voltage is greater than the preset value, the voltage stabilizing circuit 122 is broken down, the through switch circuit 121 is turned off, and the first enable signal is sent to the voltage converter 11.
In the embodiment of the present application, the breakdown voltage of the voltage regulator circuit 122 is the threshold voltage of the over-voltage protection module 12. The overvoltage protection module 12 includes a resistor, a capacitor, a regulator circuit 122, and other devices, and the control circuit can be turned on or off according to the voltage regulation characteristic of the regulator circuit 122, corresponding to the on/off of the through switch circuit 121 (e.g., a MOSFET). In a time period, the voltage stabilizing circuit 122 may be configured to control the through switch circuit 121 to be turned on, and at this time, the voltage converter 11 is in an off state (i.e., in an off state); in another time period, the voltage stabilizing circuit 122 can also be used to control the through switch circuit 121 to be turned off, and at this time, the voltage converter 11 is in a conducting state (i.e., in an operating state).
For example, the voltage converter 11 is a DC-DC step-down converter, and the through switch circuit 121 is a MOSFET. The control by the overvoltage protection module 12 determines which circuit (DC-DC buck converter and MOSFET) the input supply voltage is converted to the output supply voltage. The breakdown voltage of the voltage stabilizing circuit 122 in the overvoltage protection module 12 is set to a, and the output supply voltage is smaller than the input supply voltage. When the input power supply voltage is greater than a, the voltage stabilizing circuit 122 prohibits the MOSFET from being turned on, and the input power supply voltage is converted into the required output power supply voltage (i.e., the target power supply voltage) through the DC-DC buck converter. When the input supply voltage is less than or equal to a, the voltage stabilizing circuit 122 prohibits the DC-DC buck converter from operating, the MOSFET is turned on, and the input supply voltage is directly output to the load device 30 through the MOSFET. Since the MOSFET losses are small, the input supply voltage ≈ the output supply voltage. The DC-DC step-down converter in the embodiment of the application can meet the load power supply requirement only by using the step-down circuit with lower cost and without using the DC-DC step-down circuit with higher cost, and on the premise of meeting the performance requirement, the complexity of the circuit structure is reduced and the cost is reduced.
In some embodiments, fig. 4 is an alternative structural schematic diagram of another power supply control circuit provided in the embodiments of the present application, as shown in fig. 4. On the basis of fig. 1, 2 or 3, the through switch circuit 121 is a field effect transistor MOSFET, the input terminal of the through switch circuit 121 is the source of the MOSFET, the output terminal of the through switch circuit 121 is the drain of the MOSFET, and the switch terminal of the through switch circuit 121 is the gate of the MOSFET; the voltage stabilizing circuit 122 includes: a voltage regulator tube 1221, a first resistor 1222, a second resistor 1223 and a triode 1224; the voltage regulator tube 1221 is connected with the power supply module 20 through a first resistor 1222, the voltage regulator tube 1221 is connected with the base of the triode 1224 through a second resistor 1223, and the emitter of the triode 1224 is connected with the power supply module 20; the collector of the triode 1224 is connected to the gate of the MOSFET; the voltage regulator 1221 is configured to be in an off state when the input power supply voltage is less than or equal to a preset value, turn off the triode 1224, output a first level value, use the source voltage of the MOSFET as the input power supply voltage, use the gate voltage of the MOSFET as 0, turn on the MOSFET, and turn off the voltage converter 11, so that the input power supply voltage is output to the load device 30 through the MOSFET.
It should be noted that the voltage regulator 1221 is further connected to an enable terminal of the voltage converter 11 (the connection line is not shown in fig. 4) through the first resistor 1222 and other devices (i.e., the control terminal of the voltage stabilizing circuit 122), and is configured to break down the voltage regulator 1221 when the input power supply voltage is greater than the preset value, and send a first enable signal to the voltage converter 11.
In the embodiment of the present application, the zener diode 1221 is a zener diode, as shown in fig. 4, a cathode (also referred to as a negative electrode) of the zener diode is connected to the power supply module 20 through the first resistor 1222 (i.e., the first end of the voltage stabilizing circuit 122), the cathode of the zener diode is connected to a base of the triode 1224 through the second resistor 1223, and an emitter of the triode 1224 is connected to the power supply module 20; the anode (also referred to as the positive pole) of the zener diode is grounded. The collector of the transistor 1224 (i.e., the second terminal of the regulation circuit 122) is connected to the gate of the MOSFET, and the collector of the transistor 1224 is also connected to ground through a third resistor. The source of the MOSFET is connected to the power supply module 20 and the drain of the MOSFET is connected to the load device 30, and a diode is connected between the source of the MOSFET and the drain of the MOSFET.
In the embodiment of the present application, the zener diode is configured to, when the input supply voltage is less than or equal to the preset value, maintain the original state of the zener diode, that is, the zener diode is in an inoperative state (the zener diode is not broken down), the triode 1224 is turned off, and outputs the first level value. At this time, the zener diode transmits the first level value to the voltage converter 11, and the voltage converter 11 is in a turned-off state, so that the input supply voltage is output to the load device 30 through the MOSFET.
In the embodiment of the present application, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is a Metal-Oxide-Semiconductor Field-Effect Transistor, and can be divided into two types of "N-type" and "P-type", which may also be generally referred to as an NMOSFET and a PMOSFET, according to the polarity of its "channel" (working carrier). The MOSFET in the embodiment of the present application may be an NMOSFET or a PMOSFET, and the embodiment of the present application is not limited thereto.
In some embodiments, the voltage regulator 1221 is further configured to, when the input power supply voltage is greater than a preset value, break down the voltage regulator 1221, turn on the triode 1224, output a second level value, where the source voltage and the gate voltage of the MOSFET are both the input power supply voltage, turn off the MOSFET, and the voltage regulator 1221 sends a first enable signal to the voltage converter 11; the first level value is opposite to the second level value.
In this embodiment, the zener diode 1221 is a zener diode, as shown in fig. 4, the zener diode is further configured to be in an operating state (the zener diode is broken down and functions) when the input power supply voltage is greater than the preset value, the triode 1224 is turned on, and outputs the second level value, it can be understood that the output state of the zener diode is inverted, the zener diode outputs the second level value, the source voltage and the gate voltage of the MOSFET are both the input power supply voltage, and the MOSFET is turned off. At this time, what the zener diode transmits to the voltage converter 11 is the second level value, that is, the zener diode sends the first enable signal to the voltage converter 11, and the voltage converter 11 is turned on. The voltage converter 11 is turned on by the first enable signal, and steps down the input power supply voltage to obtain a target power supply voltage, and outputs the target power supply voltage to the load device 30.
It should be noted that, the first level value and the second level value are opposite, and there are two application scenarios, that is, the first level value is a high level value, for example, 1, and the second level value is a low level value, for example, 0; in a second application scenario, the first level value is a low level value, e.g., 0, and the first level value is a high level value, e.g., 1. In the embodiments of the present application, specific values of the first level value and the second level value are not limited, and the first level value and the second level value may be opposite to each other.
In some embodiments, fig. 5 is an optional schematic structural diagram of another power supply control circuit provided in an embodiment of the present application, and as shown in fig. 5, the power supply control circuit 10 further includes: a controller 13; a first end of the controller 13 is connected with the power supply module 20; a second terminal of the controller 13 is connected to an enable terminal of the voltage converter 11; the controller 13 is configured to obtain an input power supply voltage provided by the power supply module 20, and send a second enable signal to the voltage converter 11 when the input power supply voltage is greater than a preset value; and the voltage converter 11 is configured to receive the second enable signal, conduct under the action of the second enable signal, step down the input power supply voltage to obtain a target power supply voltage, and output the target power supply voltage to the load device 30.
In the embodiment of the present application, the enable signal received by the enable terminal of the voltage converter 11 in fig. 5 includes a first enable signal sent by the voltage stabilizing circuit 122 and a second enable signal sent by the controller 13. The controller 13 is a software voltage protection circuit, the voltage regulator 1221 is a hardware voltage protection circuit, and during normal operation, when the input power supply voltage in the circuit is greater than a preset value, the controller 13 and the voltage regulator 1221 both send enable signals (a first enable signal and a second enable signal) to the voltage converter 11, that is, the controller 13 and the voltage regulator 1221 can simultaneously control the voltage converter 11 to be conducted, so that the voltage converter 11 performs voltage reduction processing on the input power supply voltage.
Typically, software controlled reaction times in the circuit are longer than hardware controlled reaction times. The controller 13 and the voltage regulator 1221 transmit the enable signal to the enable terminal of the voltage converter 11 in the form of a high level value, when the first enable signal and the second enable signal are both low level values, the voltage converter 11 does not operate, when the first enable signal and the second enable signal are both high level values, the voltage converter 11 is turned on, when one of the first enable signal and the second enable signal is a low level value and the other is a high level value, the voltage converter 11 does not operate following the low level value. Illustratively, in the power supply process, the target power supply voltage required in the circuit is 5V, the preset value is set to 6V, and when the input power supply voltage in the circuit is 9V, the controller 13 and the voltage regulator 1221 simultaneously control the voltage converter 11 to be turned on. When the input power supply voltage in the circuit is suddenly changed from 9V to 5V (that is, in a power failure situation in the circuit), the controller 13 in the software voltage protection circuit does not react yet and still sends the second enable signal to the voltage converter 11, but the voltage regulator 1221 in the hardware voltage protection circuit does not work, the through switch tube is turned on, and the voltage converter 11 is in a turned-off state, it can be understood that the controller 13 sends a high-level value to the voltage converter 11, the voltage regulator 1221 sends a low-level value to the voltage converter 11, and the voltage converter 11 does not work, so that the input power supply voltage is output to the load device 30 through the MOSFET. The dual control of software and hardware is realized, the safety guarantee of the circuit is improved, and the applicable scenes of the circuit are increased.
In this embodiment of the application, the Controller 13 may be a Micro Controller Unit (MCU) for implementing circuit control, work protection control, and the like.
In some embodiments, the power supply control circuit 10 further includes: a linear regulator; the linear voltage stabilizer is connected with the third end of the controller 13; a linear regulator for providing a stable power supply to the controller 13.
In the embodiment of the present application, the linear regulator may be a low dropout regulator (LDO) that provides stable power supply for the controller 13 during operation, and is a reference for algorithm control, protection, and the like. The LDO may be used to convert the voltage to a voltage output required by the controller 13.
An embodiment of the present application further provides a power supply system, as shown in fig. 6, fig. 6 is an optional schematic structural diagram of the power supply system provided in the embodiment of the present application, and fig. 6 is a power supply system provided on the basis of fig. 1, where the power supply system includes: a power supply module 20 and a power supply control circuit 10 as in any of the above embodiments; the power supply module 20 is connected to an input terminal of the power supply control circuit 10.
In the embodiment of the present application, the power supply module 20 may be a power supply interface or a power supply circuit, and the power supply module 20 is composed of a plurality of power supply branches. The power supply module 20 is configured to provide the input power supply voltage with various values to any one of the power supply control circuits 10 shown in fig. 1 to 5.
In some embodiments, as shown in fig. 6, the power supply system further comprises: a load device 30; the output end of the power supply control circuit 10 is connected with the load device 30; the power supply module 20 is configured to supply power to the load device 30 through the power supply control circuit 10.
In the present embodiment, the load device 30 is used to represent an electronic component connected across a power source consuming power in a power supply system, and is a device that operates on power to convert power into other forms of power. The load device 30 includes, but is not limited to, a fan, an incandescent lamp, an electric furnace, a motor, a lighting fixture, a household appliance, a machine tool, and other electrical appliances, and may also be a communication device such as an optical transmission device, a switching device, a microwave device, a core network device, a communication base station, a terminal, and the like, which is not limited in this embodiment of the present application.
In some embodiments, the power supply system further comprises other circuits, to which the fourth terminal of the controller 13 is connected; the controller 13 is also used to control the power supply to other circuits. As shown in fig. 7, fig. 7 is an alternative configuration diagram of the power supply system provided by taking the voltage converter 11 as a DC-DC buck converter as an example on the basis of the power supply control circuit 10 shown in fig. 5.
In the embodiment of the present application, the power supply module 20 is respectively connected to a first end of the controller 13, an input end of the DC-DC buck converter, a first end of the voltage stabilizing circuit 122, and an input end of the through switch circuit 121, an output end of the through switch circuit 121 is connected to the load device 30, a second end of the voltage stabilizing circuit 122 is connected to a switch end of the through switch circuit 121, a control end of the voltage stabilizing circuit 122 is connected to an enable end of the voltage converter 11, a second end of the controller 13 is connected to an enable end of the voltage converter 11, an output end of the voltage converter 11 is connected to the load device 30, the linear regulator is connected to a third end of the controller 13, and a fourth end of the controller 13 is connected to other circuits.
It should be noted that the other circuits may be any one or more peripheral circuits such as a receiving circuit, a transmitting circuit, a converting circuit, a lighting circuit, an information storage circuit, an auxiliary device circuit, and an electronic control circuit, and the embodiment of the present application is not limited thereto.
The embodiment of the application provides a power supply method, which is applied to a power supply system, wherein the power supply system comprises an overvoltage protection module and load equipment; as shown in fig. 8, fig. 8 is a flowchart illustrating steps of a power supply method according to an embodiment of the present application, where the power supply method includes the following steps:
and S801, acquiring input power supply voltage.
And S802, when the input power supply voltage is smaller than or equal to a preset value, outputting the input power supply voltage to load equipment through the overvoltage protection module.
According to the power supply method provided by the embodiment of the application, the power supply method comprises the following steps: when the input power supply voltage is smaller than or equal to the preset value, the input power supply voltage is directly output to the load equipment through the overvoltage protection module. The overvoltage protection module has a voltage stabilization characteristic, when the input power supply voltage is smaller than or equal to a preset value, the input power supply voltage does not need to pass through the voltage converter, the voltage converter is in a closed state (the enabling end of the voltage converter does not receive a signal), and the input power supply voltage is directly output. The input power supply voltage meeting the conditions (less than or equal to the preset value) in various numerical values is output through the hardware circuit, a buck-boost conversion circuit with a complex circuit structure is not needed, software equipment is not needed to be combined, and the complexity of the circuit structure is reduced.
In some embodiments, the power supply system further comprises a voltage converter; the power supply method further comprises the following steps: when the input power supply voltage is larger than a preset value, a first enabling signal is sent to the voltage converter through the overvoltage protection module, and the voltage converter is conducted under the action of the first enabling signal; reducing the input power supply voltage through a voltage converter to obtain a target power supply voltage; the target supply voltage is output to the load device by the voltage converter.
In some embodiments, the power supply system further comprises a controller; the power supply method further comprises the following steps: when the input power supply voltage is larger than a preset value, the controller sends a second enabling signal to the voltage converter, and the voltage converter is conducted under the action of the second enabling signal; reducing the input power supply voltage through a voltage converter to obtain a target power supply voltage; the target supply voltage is output to the load device by the voltage converter.
In some embodiments, the power supply system further comprises a linear regulator; the power supply method further comprises the following steps:
the controller is supplied with stable power supply through the linear voltage regulator.
It should be noted that the power supply method and the power supply system provided in the foregoing embodiments belong to the same concept, and specific implementation processes and beneficial effects thereof are described in detail in the structural system embodiment, and are not described herein again. For technical details not disclosed in the embodiments of the method, reference is made to the description of the embodiments of the structural system of the present application for understanding.
In this embodiment of the present application, based on the power supply method provided in this embodiment of the present application, the power supply system may further include a processor and a memory storing an executable computer program, where the processor is configured to implement the power supply method provided in this embodiment of the present application when the processor executes the executable computer program stored in the memory.
It should be noted that the processor and the memory may also be part of the controller 13 in fig. 5 or fig. 7, and the embodiment of the present application is not limited thereto.
In the embodiment of the present invention, the Processor may be at least one of an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a ProgRAMmable Logic Device (PLD), a Field ProgRAMmable Gate Array (FPGA), a Central Processing Unit (CPU), a controller, a microcontroller, and a microprocessor. It is understood that the electronic devices for implementing the above processor functions may be other devices, and the embodiments of the present application are not limited in particular.
In the embodiment of the present application, the controller 13, the processor, and the memory are connected by a bus, thereby achieving mutual communication between these devices.
The memory is used to store executable computer programs including computer operating instructions and may include high speed RAM memory and may also include non-volatile memory, such as at least two disk storage. In practical applications, the Memory may be a volatile Memory (volatile Memory), such as a Random-Access Memory (RAM); or a non-volatile Memory (non-volatile Memory), such as a Read-Only Memory (ROM), a flash Memory (flash Memory), a Hard Disk (Hard Disk Drive, HDD) or a Solid-State Drive (SSD); or a combination of the above types of memories and provides executable computer programs and data to the processor.
In addition, each functional module in this embodiment may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware or a form of a software functional module.
Based on the understanding that the technical solution of the present embodiment essentially or a part contributing to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium, and include several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the method of the present embodiment. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.
The embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and is used for implementing the power supply method according to any one of the above embodiments when being executed by a processor.
For example, the program instructions corresponding to a power supply method in this embodiment may be stored in a storage medium such as an optical disc, a hard disc, or a usb flash drive, and when the program instructions corresponding to a power supply method in the storage medium are read or executed by an electronic device, the power supply method according to any of the above embodiments may be implemented.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of implementations of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks and/or flowchart block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks in the flowchart and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application.
Claims (15)
1. A power supply control circuit, the power supply control circuit comprising: a voltage converter and an overvoltage protection module;
the input end of the voltage converter and the input end of the overvoltage protection module are respectively connected with a power supply module;
the output end of the voltage converter and the output end of the overvoltage protection module are respectively connected with load equipment;
the power supply module is used for providing input power supply voltages with various values for the voltage converter and the overvoltage protection module;
the overvoltage protection module is used for outputting the input power supply voltage to the load equipment when the input power supply voltage is smaller than or equal to a preset value; wherein the voltage converter is in an off state.
2. The power supply control circuit according to claim 1, wherein the control terminal of the overvoltage protection module is connected to the enable terminal of the voltage converter;
the overvoltage protection module is further used for sending a first enabling signal to the voltage converter when the input power supply voltage is larger than the preset value;
the voltage converter is used for conducting under the action of the first enabling signal, reducing the input power supply voltage to obtain a target power supply voltage, and outputting the target power supply voltage to the load equipment; the target supply voltage is less than or equal to the preset value.
3. The power supply control circuit according to claim 1 or 2, wherein the overvoltage protection module comprises a direct-current switch circuit and a voltage stabilizing circuit, and the preset value represents a breakdown voltage value of the voltage stabilizing circuit;
the input end of the through switch circuit and the first end of the voltage stabilizing circuit are respectively connected with the power supply module;
the output end of the through switch circuit is connected with the load equipment;
the second end of the voltage stabilizing circuit is connected with the switch end of the through switch circuit, and the control end of the voltage stabilizing circuit is connected with the enable end of the voltage converter;
and the voltage stabilizing circuit is used for controlling one of the voltage converter and the through switch circuit to be in a working state at the same time.
4. The power supply control circuit of claim 3,
the voltage stabilizing circuit is used for controlling the through switch circuit to be switched on and the voltage converter to be in a switching-off state when the input power supply voltage is smaller than or equal to the preset value, so that the input power supply voltage is output to the load equipment through the through switch circuit;
or,
and the voltage stabilizing circuit is used for breaking down when the input power supply voltage is greater than the preset value, turning off the direct-current switch circuit and sending a first enabling signal to the voltage converter.
5. The power supply control circuit according to claim 3, wherein the through switch circuit is a field effect transistor, the input terminal of the through switch circuit is a source terminal of the field effect transistor, the output terminal of the through switch circuit is a drain terminal of the field effect transistor, and the switch terminal of the through switch circuit is a gate terminal of the field effect transistor;
the voltage stabilizing circuit comprises: the voltage regulator comprises a voltage regulator tube, a first resistor, a second resistor and a triode;
the voltage-stabilizing tube is connected with the power supply module through the first resistor, the voltage-stabilizing tube is connected with the base electrode of the triode through the second resistor, and the emitting electrode of the triode is connected with the power supply module; the collector of the triode is connected with the grid of the field effect transistor;
the voltage stabilizing tube is used for being in a non-working state when the input power supply voltage is smaller than or equal to the preset value, the triode is turned off and outputs a first level value, the source voltage of the field effect transistor is the input power supply voltage, the grid voltage of the field effect transistor is 0, the field effect transistor is turned on, and the voltage converter is in a turned-off state, so that the input power supply voltage is output to the load equipment through the field effect transistor.
6. The power supply control circuit of claim 5,
the voltage regulator tube is also used for breaking down when the input power supply voltage is greater than the preset value, the triode is switched on and outputs a second level value, the source voltage and the grid voltage of the field effect transistor are both the input power supply voltage, the field effect transistor is switched off, and the voltage regulator tube sends a first enabling signal to the voltage converter; the first level value is opposite to the second level value.
7. The power supply control circuit according to claim 1 or 2,
the voltage converter is a direct current buck converter.
8. The power supply control circuit according to claim 1 or 2, characterized in that the power supply control circuit further comprises: a controller;
the first end of the controller is connected with the power supply module;
the second end of the controller is connected with the enabling end of the voltage converter;
the controller is used for acquiring the input power supply voltage provided by the power supply module, and sending a second enabling signal to the voltage converter when the input power supply voltage is greater than the preset value;
the voltage converter is used for conducting under the action of the second enabling signal, reducing the input power supply voltage to obtain a target power supply voltage, and outputting the target power supply voltage to the load equipment.
9. The power supply control circuit of claim 8, further comprising: a linear regulator;
the linear voltage stabilizer is connected with a third end of the controller;
and the linear voltage stabilizer is used for providing stable power supply for the controller.
10. A power supply system, characterized in that the power supply system comprises: a power supply module and a power supply control circuit as claimed in any one of claims 1-9;
and the power supply module is connected with the input end of the power supply control circuit.
11. The power supply system of claim 10, further comprising: a load device;
the output end of the power supply control circuit is connected with the load equipment;
the power supply module is used for supplying power to the load equipment through the power supply control circuit.
12. The power supply method is characterized by being applied to a power supply system, wherein the power supply system comprises an overvoltage protection module and load equipment; the method comprises the following steps:
acquiring an input power supply voltage;
and when the input power supply voltage is smaller than or equal to a preset value, the input power supply voltage is output to the load equipment through the overvoltage protection module.
13. The method of claim 12, wherein the power supply system further comprises a voltage converter; the method further comprises the following steps:
when the input power supply voltage is larger than the preset value, a first enabling signal is sent to the voltage converter through the overvoltage protection module, and the voltage converter is conducted under the action of the first enabling signal;
the input power supply voltage is reduced through the voltage converter to obtain a target power supply voltage;
outputting, by the voltage converter, the target supply voltage to the load device.
14. The method of claim 12 or 13, wherein the power supply system further comprises a controller; the method further comprises the following steps:
when the input power supply voltage is larger than the preset value, the controller sends a second enabling signal to the voltage converter, and the voltage converter is conducted under the action of the second enabling signal;
the input power supply voltage is reduced through the voltage converter to obtain a target power supply voltage;
outputting, by the voltage converter, the target supply voltage to the load device.
15. The method of claim 14, wherein the power supply system further comprises a linear regulator; the method further comprises the following steps:
and supplying stable power supply to the controller through the linear voltage regulator.
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| CN202210714113.2A CN115001102A (en) | 2022-06-22 | 2022-06-22 | Power supply control circuit, power supply system and power supply method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210714113.2A CN115001102A (en) | 2022-06-22 | 2022-06-22 | Power supply control circuit, power supply system and power supply method |
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