CN117977784A - Switching power supply circuit, power management device and control method thereof - Google Patents
Switching power supply circuit, power management device and control method thereof Download PDFInfo
- Publication number
- CN117977784A CN117977784A CN202410364048.4A CN202410364048A CN117977784A CN 117977784 A CN117977784 A CN 117977784A CN 202410364048 A CN202410364048 A CN 202410364048A CN 117977784 A CN117977784 A CN 117977784A
- Authority
- CN
- China
- Prior art keywords
- circuit
- input end
- voltage
- power supply
- switching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 57
- 230000002708 enhancing effect Effects 0.000 claims description 6
- 230000036632 reaction speed Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 239000000872 buffer Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The invention relates to the technical field of power control, and discloses a switching power supply circuit, a power management device and a control method thereof, wherein the switching power supply circuit comprises: the input end of the voltage detection circuit is electrically connected with the direct current input end, and the voltage detection circuit is used for detecting the direct current voltage input by the direct current input end and outputting a voltage detection signal; the input end of the undervoltage trigger circuit is electrically connected with the output end of the voltage detection circuit, and the undervoltage trigger circuit is used for outputting an undervoltage trigger signal when the voltage of the voltage detection signal is lower than a preset voltage; the controlled end of the power supply switching circuit is electrically connected with the output end of the under-voltage trigger circuit, and the input end of the power supply switching circuit is electrically connected with the direct current input end and the output end of the standby battery; the power supply switching circuit is used for closing a passage between the output end of the standby battery and the load and opening a passage between the direct current input end and the load when receiving the undervoltage trigger signal. The invention aims to simplify the structure of an under-voltage protection device and improve the reaction speed.
Description
Technical Field
The present invention relates to the field of power control technologies, and in particular, to a switching power supply circuit, a power management device, and a control method thereof.
Background
An under-voltage refers to a voltage in an electrical device or circuit that is below the minimum voltage value required for proper operation. In the power supply system, if the voltage is lower than a preset threshold, an undervoltage phenomenon may occur. For example, in a switching power supply, if the input voltage is below the minimum input voltage that the regulator can effectively regulate, or the output voltage drops for some reason to a level insufficient to meet the load demand, this condition is referred to as an under-voltage. The undervoltage may cause the device to fail to start up normally, operate unstably, and have reduced performance, and in severe cases, may damage electronic components inside the device, or even stop operating completely. Therefore, many electrical devices and power systems are equipped with an under-voltage protection device, and when the voltage is detected to be lower than a set threshold value, the power supply is automatically cut off or switched to a standby power supply, so as to ensure the safety of the device and the stability of the system. However, in the prior art, the controller is mostly adopted to realize power switching, which results in larger volume, higher cost and slower reaction speed of the undervoltage protection device.
Disclosure of Invention
The invention mainly aims to provide a switching power supply circuit which aims to simplify the structure of an undervoltage protection device and improve the reaction speed.
In order to achieve the above object, the present invention provides a switching power supply circuit, which is applied to a power management device, the power management device includes a dc input terminal and a backup battery, the switching power supply circuit includes:
the input end of the voltage detection circuit is electrically connected with the direct current input end, and the voltage detection circuit is used for detecting the direct current voltage input by the direct current input end and outputting a voltage detection signal;
The input end of the undervoltage trigger circuit is electrically connected with the output end of the voltage detection circuit, and the undervoltage trigger circuit is used for outputting an undervoltage trigger signal when the voltage of the voltage detection signal is lower than a preset voltage;
The controlled end of the power supply switching circuit is electrically connected with the output end of the undervoltage trigger circuit, and the input end of the power supply switching circuit is electrically connected with the direct current input end and the output end of the standby battery; and the power supply switching circuit is used for closing the passage between the output end of the standby battery and the load and opening the passage between the direct current input end and the load when receiving the undervoltage trigger signal.
Preferably, the voltage detection circuit includes: the first end of the first resistor is electrically connected with the direct current input end, the second end of the first resistor is electrically connected with the first end of the second resistor, and the second end of the second resistor is grounded.
Preferably, the under-voltage trigger circuit includes: the switching device comprises a third resistor, a first switching tube, a first inverter and a second inverter, wherein the first end of the third resistor is connected with the direct current input end, the second end of the third resistor and the input end of the first switching tube are respectively connected with the input end of the second inverter, the output end of the second inverter is connected with the input end of the first inverter, the controlled end of the first switching tube is connected with the second end of the first resistor, and the output end of the first switching tube is grounded.
Preferably, the under-voltage trigger circuit further comprises:
The signal enhancement circuit is respectively connected with the output end of the first switching tube and the input end of the second inverter;
The signal enhancement circuit is used for enhancing the signal intensity of the undervoltage trigger signal and outputting the signal intensity;
The signal enhancement circuit comprises a third inverter and a fourth inverter, wherein the input end of the fourth inverter is connected with the input end of the first switching tube, the input end of the third inverter is connected with the output end of the fourth inverter, and the output end of the third inverter is connected with the input end of the second inverter.
Preferably, the power supply switching circuit includes:
The controlled end of the first switch circuit is electrically connected with the undervoltage trigger circuit, and the input end of the first switch circuit is electrically connected with the direct current input end;
the controlled end of the second switching circuit is electrically connected with the undervoltage trigger circuit, and the input end of the second switching circuit is electrically connected with the output end of the standby battery;
The first switching circuit is used for disconnecting the path between the direct current input end and the load when receiving an undervoltage trigger signal; the second switch circuit is used for closing a passage between the output end of the standby battery and a load when receiving an undervoltage trigger signal.
Preferably, the switching power supply circuit further includes:
the controlled end of the third switching circuit is electrically connected with the output end of the undervoltage trigger circuit, the input end of the third switching circuit is electrically connected with the direct current input end, and the output end of the third switching circuit is electrically connected with the input end of the standby battery;
the under-voltage trigger circuit is further used for outputting an under-voltage trigger signal when the voltage of the voltage detection signal is lower than a preset voltage; and the third switch circuit is used for closing a passage between the direct current input end and the standby battery according to the undervoltage trigger signal.
The invention also provides a power management device which comprises a direct current input end, a standby battery and the switching power supply circuit.
The invention also provides a control method of the switching power supply circuit, which is based on the switching power supply circuit, and comprises the following steps:
acquiring a voltage detection signal;
Outputting an undervoltage trigger signal according to the voltage detection signal;
And closing a passage between the output end of the standby battery and a load according to the undervoltage trigger signal, and opening the passage between the direct current input end and the load.
Preferably, the step of outputting the undervoltage trigger signal according to the voltage detection signal further includes:
And closing a passage between the direct current input end and the standby battery according to the undervoltage trigger signal.
The technical scheme of the invention is that the switching power supply circuit comprises a voltage detection circuit, an undervoltage trigger circuit and a power supply switching circuit. The voltage detection circuit is used for detecting the voltage of the direct current voltage input by the direct current input end and outputting a voltage detection signal to the undervoltage trigger circuit. When the voltage of the voltage detection signal is lower than the preset voltage, the undervoltage trigger circuit outputs an undervoltage trigger signal. The power supply switching circuit further closes the passage between the output end of the standby battery and the load according to the undervoltage trigger signal, and opens the passage between the direct current input end and the load, so that the switching of the power supply is realized, and the input voltage of the load power supply is ensured to be in a non-undervoltage state. Through adopting simple structure's circuit connection, realized the technical effect of undervoltage protection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a switching power supply circuit of the present invention;
FIG. 2 is a schematic diagram of a switching power supply circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another embodiment of a switching power supply circuit according to the present invention;
FIG. 4 is a circuit diagram of an embodiment of a switching power supply circuit according to the present invention;
FIG. 5 is a circuit diagram of another embodiment of a switching power supply circuit according to the present invention;
FIG. 6 is a flow chart of a control method of the switching power supply circuit of the present invention;
fig. 7 is a flowchart illustrating a control method of a switching power supply circuit according to an embodiment of the invention.
Reference numerals illustrate:
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Many electrical devices and power systems are equipped with undervoltage protection devices that automatically shut down power or switch to backup power when a voltage is detected below a set threshold to ensure device safety and system stability. However, in the prior art, the controller is mostly adopted to realize power switching, which results in larger volume, higher cost and slower reaction speed of the undervoltage protection device.
Accordingly, referring to fig. 1, the present invention proposes a switching power supply circuit applied to a power management device including a dc input terminal, a backup battery, the switching power supply circuit comprising:
the voltage detection circuit 10, the input end of the voltage detection circuit 10 is electrically connected with the direct current input end, the voltage detection circuit 10 is used for detecting the direct current voltage input by the direct current input end and outputting a voltage detection signal;
the input end of the undervoltage trigger circuit 20 is electrically connected with the output end of the voltage detection circuit 10, and the undervoltage trigger circuit 20 is used for outputting an undervoltage trigger signal when the voltage of the voltage detection signal is lower than a preset voltage;
The controlled end of the power supply switching circuit 30 is electrically connected with the output end of the under-voltage trigger circuit 20, and the input end of the power supply switching circuit 30 is electrically connected with the direct current input end and the output end of the standby battery; the power supply switching circuit 30 is configured to close a path between the output terminal of the backup battery and the load and open a path between the dc input terminal and the load when receiving the under-voltage trigger signal.
Referring to fig. 4, in the present embodiment, the voltage detection circuit 10 may be implemented using a resistor voltage division detection circuit, a linear operational amplifier, a voltage detection sensor, or the like. Specifically, the voltage detection circuit 10 includes: the first end of the first resistor is electrically connected with the direct current input end, the second end of the first resistor is electrically connected with the first end of the second resistor, and the second end of the second resistor is grounded.
Referring to fig. 4, in the present embodiment, the under-voltage trigger circuit 20 may be implemented by using a trigger switch circuit and an inverter, and the under-voltage trigger circuit 20 includes: the switching device comprises a third resistor, a first switching tube, a first inverter and a second inverter, wherein the first end of the third resistor is connected with the direct current input end, the second end of the third resistor and the input end of the first switching tube are respectively connected with the input end of the second inverter, the output end of the second inverter is connected with the input end of the first inverter, the controlled end of the first switching tube is connected with the second end of the first resistor, and the output end of the first switching tube is grounded. Further, the first switch tube is an NMOS tube.
Referring to fig. 2, in the present embodiment, the power supply switching circuit 30 may be implemented using a switching circuit, a relay, or the like. Specifically, the power supply switching circuit 30 includes:
a first switch circuit 31, wherein a controlled end of the first switch circuit 31 is electrically connected with the under-voltage trigger circuit 20, and an input end of the first switch circuit 31 is electrically connected with the direct current input end;
a second switch circuit 32, wherein a controlled end of the second switch circuit 32 is electrically connected with the under-voltage trigger circuit 20, and an input end of the second switch circuit 32 is electrically connected with an output end of the standby battery;
Wherein, the first switch circuit 31 is configured to disconnect a path between the dc input terminal and a load when receiving an under-voltage trigger signal; the second switch circuit 32 is configured to close a path between the output terminal of the backup battery and a load when receiving an under-voltage trigger signal.
The first switching circuit 31 and the second switching circuit 32 may be implemented using at least one switching transistor, such as a MOS transistor, an IGBT transistor, a thyristor, a triode, a power transistor, or the like. Specifically, the switching transistor used in the switching circuit needs to be matched with the under-voltage trigger signal output from the under-voltage trigger circuit 20. In this embodiment, the switching transistors used in the first switching circuit 31 and the second switching circuit 32 are NMOS transistors, so as to implement different actions when receiving different level signals. Alternatively, the first switch circuit 31 and the second switch circuit 32 may also be NMOS transistors and PMOS transistors, respectively. At this time, the under-voltage trigger signals received by the first switch circuit 31 and the second switch circuit 32 are under-voltage trigger signals with the same level.
It can be understood that the preset under-voltage is the on-voltage of the first switching tube Q1. The resistance values of the first resistor R1 and the second resistor R2 can be set by the turn-on voltage of the first switching tube Q1 of the developer, so that when the power supply voltage is in an under-voltage state, the voltage value of the voltage detection signal cannot reach the turn-on voltage of the first switching tube Q1.
The normal power supply voltage of the dc input terminal is 3V, the turn-on voltage is 0.7V, and the resistance values of the first resistor R1 and the second resistor R2 are 100kΩ. When the power supply voltage connected to the direct current input end is 3V, the voltage is divided by the first resistor R1 and the second resistor R2, and then a voltage detection signal with the voltage of 1.5V is output, so that the first switch tube Q1 can be turned on, and the second end of the third resistor R3 is directly grounded, at this time, the level of the second end of the third resistor R3 is low, and after passing through the second inverter F2, the signal is converted into a high level signal and is output to the controlled end of the first switch circuit 31; and simultaneously, the signal is converted into a low level signal after passing through the first inverter F1 and is output to the controlled terminal of the second switching circuit 32. At this time, the path between the dc input and the load is in an on state, and the path between the output of the backup battery and the load is in an off state.
When the power supply voltage of the dc input terminal is under voltage, for example, 1.2V, the first resistor R1 and the second resistor R2 divide the voltage, and then output a voltage detection signal with a voltage of 0.6V, so that the first switching tube Q1 is in an off state. At this time, the second end voltage of the third resistor R3 is pulled up to the voltage value of the power supply voltage, i.e. 1.2V, and is output as a low level signal after passing through the first inverter F1, and is output as a high level signal after passing through the second inverter F2. At this time, the path between the dc input terminal and the load is in an off state, and the path between the output terminal of the backup battery and the load is in an on state.
The technical scheme of the invention is that the switching power supply circuit comprises a voltage detection circuit 10, an undervoltage trigger circuit 20 and a power supply switching circuit 30. The voltage detection circuit 10 detects the voltage of the dc voltage input from the dc input terminal, and outputs a voltage detection signal to the brown-out trigger circuit 20. When the voltage of the voltage detection signal is lower than the preset voltage, the under-voltage trigger circuit 20 will output an under-voltage trigger signal. The power supply switching circuit 30 further closes the path between the output end of the standby battery and the load according to the under-voltage trigger signal, and opens the path between the direct current input end and the load, thereby realizing the switching of the power supply and ensuring that the input voltage of the power supply of the load is in a non-under-voltage state. Through adopting simple structure's circuit connection, realized the technical effect of undervoltage protection.
Referring to fig. 5, in an embodiment of the present invention, the under-voltage trigger circuit 20 further includes:
The signal enhancement circuit 40 is respectively connected with the output end of the first switching tube and the input end of the second inverter;
the signal enhancing circuit 40 is configured to enhance the signal strength of the undervoltage trigger signal and output the signal;
the signal enhancing circuit 40 includes a third inverter and a fourth inverter, where an input end of the fourth inverter is connected to an input end of the first switching tube, an input end of the third inverter is connected to an output end of the fourth inverter, and an output end of the third inverter is connected to an input end of the second inverter.
In the present embodiment, the signal enhancing circuit 40 may be implemented using an amplifier, a buffer, or the like. Specifically, the signal enhancing circuit 40 can also play a role in signal reproduction and shaping by improving the driving capability of the signal and increasing the swing of the signal by using two sets of inverters. Since the output current of a single inverter (e.g., CMOS inverter) is limited, the output signal may be severely attenuated for the case where long-distance transmission is required or a load is large. By cascading two inverters, the output current of the signal can be effectively improved, so that the driving capability of the signal is enhanced. After passing through one inverter, the signal level can be changed from low level to high level, or from high level to low level, and then passing through the second inverter, the high and low levels of the signal can be further strengthened, so that the difference between the high and low levels of the signal is increased, namely the signal swing is increased, the noise interference is reduced, and the signal quality is improved. During the transmission of digital signals, the signals may be distorted due to line loss and the like. Through the cascade connection of the two groups of inverters, signals can be regenerated and shaped to a certain extent, clear logic levels of the signals can be recovered, and the integrity of the signals is ensured. In the present embodiment, the first inverter F1 and the second inverter F2 constitute one set of buffers, and the third inverter F3 and the fourth inverter F4 constitute another set of buffers; as can be seen from the above description, when the voltage of the voltage detection signal is higher than the preset low voltage, the first switching tube can be turned on to output a turn-off signal that is a low level signal, and the turn-off signal is subjected to signal enhancement by the fourth inverter and the third inverter, and then converted into an enhanced high level signal by the second inverter, and then output to the first switching circuit 31.
Referring to fig. 3, in this embodiment, the switching power supply circuit further includes:
the controlled end of the third switch circuit 50 is electrically connected with the output end of the under-voltage trigger circuit 20, the input end is electrically connected with the direct current input end, and the output end is electrically connected with the input end of the standby battery;
wherein, the under-voltage trigger circuit 20 is further configured to output an under-voltage trigger signal when the voltage of the voltage detection signal is lower than a preset voltage; the third switch circuit 50 is configured to close a path between the dc input terminal and the backup battery according to the under-voltage trigger signal.
It should be appreciated that to avoid frequent replacement of the battery backup, the battery backup is a rechargeable battery. When the dc voltage input from the dc input terminal is in the under-voltage state, the voltage detection signal output by the voltage detection circuit 10 controls the under-voltage trigger circuit 20 to output the under-voltage trigger signal. The third switch circuit 50 receives the under-voltage trigger signal and turns on the path between the dc input terminal and the backup battery, thereby charging the power supply battery with the dc voltage. At this time, the power supply of the load is supplied by the battery instead of the direct current input end, so that the problem of load damage caused by the undervoltage of the voltage output by the direct current input end when the direct current input end is directly connected with the load in a power supply mode is effectively avoided. Further, the input end of the third switch circuit 50 may be connected with either the first inverter or the second inverting output end. When the input end of the third switch circuit 50 is electrically connected with the output end of the first inverter, that is, when the output of the under-voltage trigger circuit 20 is a low-level signal, the path between the direct-current input end and the standby battery is conducted; when the input terminal of the third switching circuit 50 is electrically connected to the output terminal of the second inverter, that is, when the signal output from the under-voltage trigger circuit 20 is a high level signal, the path between the dc input terminal and the backup battery is turned on.
The invention also provides a power management device which comprises a direct current input end, a standby battery and the switching power supply circuit. It should be noted that, because the power management device of the present invention is based on the above-mentioned switching power supply circuit, embodiments of the power management device of the present invention include all technical solutions of all embodiments of the above-mentioned switching power supply circuit, and the achieved technical effects are identical, and are not described herein again.
Referring to fig. 6, the present invention further provides a control method of a switching power supply circuit, where the control method is based on the switching power supply circuit, and the control method includes:
step S100: acquiring a voltage detection signal;
Step S200: outputting an undervoltage trigger signal according to the voltage detection signal;
Step S300: and closing a passage between the output end of the standby battery and a load according to the undervoltage trigger signal, and opening the passage between the direct current input end and the load.
In the present embodiment, the switching power supply circuit detects the voltage of the dc input terminal by the voltage detection circuit 10 and outputs a voltage detection signal. The voltage detection signal is input to the under-voltage trigger circuit 20 as an on signal, and the setting of the under-voltage trigger circuit 20 is required to be associated with a predetermined voltage. The brown-out trigger circuit 20 will output a brown-out trigger signal after receiving the voltage detection signal. The undervoltage trigger signal can be divided into a low-level signal and a high-level signal, so that two groups of same switch circuits are respectively controlled. The undervoltage trigger signal may be a single level signal, but two sets of switch circuits are implemented by two sets of opposite switch circuits. The power supply switching circuit 30 controls the path between the output terminal of the backup battery and the load and the path between the dc input terminal and the load through the first switching circuit 31 and the second switching circuit 32, respectively. After the under-voltage trigger circuit 20 outputs the under-voltage trigger signal, the power supply switching circuit 30 will disconnect the path between the dc input end and the load, and conduct the path between the output end of the backup battery and the load, so as to realize the switching of the power supply of the load.
Referring to fig. 7, further, after the step of outputting the undervoltage trigger signal according to the voltage detection signal, the method further includes:
step S210: and closing a passage between the direct current input end and the standby battery according to the undervoltage trigger signal.
In this embodiment, it is considered that a backup battery is used as the temporary power supply device, and a rechargeable battery may be used as the backup battery in order to avoid the number of times of replacement. The voltage input through the direct current input terminal is used as a charging power supply for the power supply battery. The third switch circuit 40 receives the under-voltage trigger signal and turns on the path between the dc input terminal and the backup battery, thereby charging the power supply battery with the dc voltage.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (9)
1. A switching power supply circuit applied to a power management device, wherein the power management device comprises a direct current input end and a standby battery, and the switching power supply circuit comprises:
the input end of the voltage detection circuit is electrically connected with the direct current input end, and the voltage detection circuit is used for detecting the direct current voltage input by the direct current input end and outputting a voltage detection signal;
The input end of the undervoltage trigger circuit is electrically connected with the output end of the voltage detection circuit, and the undervoltage trigger circuit is used for outputting an undervoltage trigger signal when the voltage of the voltage detection signal is lower than a preset voltage;
The controlled end of the power supply switching circuit is electrically connected with the output end of the undervoltage trigger circuit, and the input end of the power supply switching circuit is electrically connected with the direct current input end and the output end of the standby battery; and the power supply switching circuit is used for closing the passage between the output end of the standby battery and the load and opening the passage between the direct current input end and the load when receiving the undervoltage trigger signal.
2. The switching power supply circuit according to claim 1, wherein the voltage detection circuit includes: the first end of the first resistor is electrically connected with the direct current input end, the second end of the first resistor is electrically connected with the first end of the second resistor, and the second end of the second resistor is grounded.
3. The switching power supply circuit of claim 2 wherein said under-voltage trigger circuit comprises: the switching device comprises a third resistor, a first switching tube, a first inverter and a second inverter, wherein the first end of the third resistor is connected with the direct current input end, the second end of the third resistor and the input end of the first switching tube are respectively connected with the input end of the second inverter, the output end of the second inverter is connected with the input end of the first inverter, the controlled end of the first switching tube is connected with the second end of the first resistor, and the output end of the first switching tube is grounded.
4. The switching power supply circuit of claim 3 wherein said under-voltage trigger circuit further comprises:
The signal enhancement circuit is respectively connected with the output end of the first switching tube and the input end of the second inverter;
The signal enhancement circuit is used for enhancing the signal intensity of the undervoltage trigger signal and outputting the signal intensity;
The signal enhancement circuit comprises a third inverter and a fourth inverter, wherein the input end of the fourth inverter is connected with the input end of the first switching tube, the input end of the third inverter is connected with the output end of the fourth inverter, and the output end of the third inverter is connected with the input end of the second inverter.
5. The switching power supply circuit according to claim 1, wherein the power supply switching circuit includes:
The controlled end of the first switch circuit is electrically connected with the undervoltage trigger circuit, and the input end of the first switch circuit is electrically connected with the direct current input end;
the controlled end of the second switching circuit is electrically connected with the undervoltage trigger circuit, and the input end of the second switching circuit is electrically connected with the output end of the standby battery;
The first switching circuit is used for disconnecting the path between the direct current input end and the load when receiving an undervoltage trigger signal; the second switch circuit is used for closing a passage between the output end of the standby battery and a load when receiving an undervoltage trigger signal.
6. The switching power supply circuit of claim 1 wherein said switching power supply circuit further comprises:
the controlled end of the third switching circuit is electrically connected with the output end of the undervoltage trigger circuit, the input end of the third switching circuit is electrically connected with the direct current input end, and the output end of the third switching circuit is electrically connected with the input end of the standby battery;
the under-voltage trigger circuit is further used for outputting an under-voltage trigger signal when the voltage of the voltage detection signal is lower than a preset voltage; and the third switch circuit is used for closing a passage between the direct current input end and the standby battery according to the undervoltage trigger signal.
7. A power management device comprising a dc input, a battery backup and a switching power supply circuit according to any one of claims 1-6.
8. A control method of a switching power supply circuit, characterized in that the control method is based on the switching power supply circuit according to claim 1, the control method comprising:
acquiring a voltage detection signal;
Outputting an undervoltage trigger signal according to the voltage detection signal;
And closing a passage between the output end of the standby battery and a load according to the undervoltage trigger signal, and opening the passage between the direct current input end and the load.
9. The method of controlling a switching power supply circuit according to claim 8, wherein the step of outputting an undervoltage trigger signal according to the voltage detection signal further comprises:
And closing a passage between the direct current input end and the standby battery according to the undervoltage trigger signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410364048.4A CN117977784A (en) | 2024-03-28 | 2024-03-28 | Switching power supply circuit, power management device and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410364048.4A CN117977784A (en) | 2024-03-28 | 2024-03-28 | Switching power supply circuit, power management device and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117977784A true CN117977784A (en) | 2024-05-03 |
Family
ID=90863341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410364048.4A Pending CN117977784A (en) | 2024-03-28 | 2024-03-28 | Switching power supply circuit, power management device and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117977784A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204721079U (en) * | 2015-04-20 | 2015-10-21 | 北京航天自动控制研究所 | Dual-power automatic switching and charging circuit |
| CN214380275U (en) * | 2020-12-21 | 2021-10-08 | 潍柴动力股份有限公司 | Dual-power supply circuit and dual-power supply system of T-Box controller |
| CN114567837A (en) * | 2022-02-28 | 2022-05-31 | 歌尔微电子股份有限公司 | Sensor microphone output protection circuit and sensor microphone |
-
2024
- 2024-03-28 CN CN202410364048.4A patent/CN117977784A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204721079U (en) * | 2015-04-20 | 2015-10-21 | 北京航天自动控制研究所 | Dual-power automatic switching and charging circuit |
| CN214380275U (en) * | 2020-12-21 | 2021-10-08 | 潍柴动力股份有限公司 | Dual-power supply circuit and dual-power supply system of T-Box controller |
| CN114567837A (en) * | 2022-02-28 | 2022-05-31 | 歌尔微电子股份有限公司 | Sensor microphone output protection circuit and sensor microphone |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7038522B2 (en) | System and method for redundant power supply connection | |
| US6304088B1 (en) | Voltage monitor circuit with adjustable hysteresis using a single comparator | |
| US10666320B2 (en) | Ringing suppression circuit | |
| CN112713642B (en) | Power supply detection switching control circuit | |
| WO2021197380A1 (en) | An undervoltage protection circuit for a dc/dc converter and method thereof | |
| US6069515A (en) | High voltage input buffer circuit using low voltage transistors | |
| US5119312A (en) | Circuitry for surveillance of switching state of a power transistor | |
| EP1032132B1 (en) | An output buffer for a low voltage differential signaling receiver | |
| US20020172857A1 (en) | Battery state monitoring circuit and battery device | |
| US20190363626A1 (en) | Switch circuit | |
| CN117977784A (en) | Switching power supply circuit, power management device and control method thereof | |
| CN109546743B (en) | Power supply control device for vehicle-mounted information terminal, vehicle-mounted information terminal and vehicle | |
| US20040108874A1 (en) | System and method for obtaining hysteresis through body substrate control | |
| US20220045533A1 (en) | Charge/discharge control circuit and battery device provided with same | |
| CN112073050B (en) | Power supply power-on reset circuit for semiconductor integrated circuit | |
| CN114362287A (en) | Battery 0V charging forbidding circuit and battery protection circuit | |
| CN111817257A (en) | Low-voltage power supply power-down protection circuit and low-voltage power supply power-down protection device | |
| CN111766913B (en) | Control system of integrated circuit and integrated circuit | |
| US20230299765A1 (en) | Pull up and pulldown stabiliser circuits and methods for gate drivers | |
| CN219658053U (en) | Drive control circuit and electronic device | |
| CN220291721U (en) | Power supply switching device for switching device and switching device | |
| US8502568B2 (en) | Receiver circuit with high input voltage protection | |
| CN113258641B (en) | Battery 0V charge forbidding circuit for reducing high-voltage thick gate oxide MOS (metal oxide semiconductor) transistor | |
| CN110323712B (en) | Potential holding control method and overcurrent protection control method | |
| US20230291018A1 (en) | Charge and discharge control circuit and battery device including the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |