CN212033826U - Power supply circuit and electronic device - Google Patents
Power supply circuit and electronic device Download PDFInfo
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- CN212033826U CN212033826U CN202020296125.4U CN202020296125U CN212033826U CN 212033826 U CN212033826 U CN 212033826U CN 202020296125 U CN202020296125 U CN 202020296125U CN 212033826 U CN212033826 U CN 212033826U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The utility model relates to a power supply circuit and electronic equipment, power supply circuit are applied to the power supply system who has main power supply and stand-by power supply, and wherein, power supply system passes through main power supply or stand-by power supply and supplies power for load circuit, include: the sampling module is coupled to the main power supply and used for sampling the voltage of the main power supply to output a first sampling signal. The control module is coupled to the sampling module and used for receiving a first sampling signal so as to output a switching signal according to the first sampling signal, and the switch switching module is coupled to the control module and coupled to the main power supply and the standby power supply and used for receiving the switching signal and conducting a path between the main power supply and the load circuit or conducting a path between the standby power supply and the load circuit. The utility model provides a power supply circuit passes through sampling module and switch switching module, can satisfy the requirement of intelligent product today according to the electric quantity change automatic switch-over main power source and stand-by power supply of main power source.
Description
Technical Field
The utility model relates to a power technical field, concretely relates to power supply circuit and electronic equipment.
Background
At present, in electronic equipment, a main power supply and a standby power supply are generally adopted to supply power so as to improve the stability of the power supply of the electronic equipment. The traditional main power supply and the standby power supply are switched by the potential difference between the main power supply and the standby power supply, when the potential of the main power supply is higher than that of the standby power supply, the main power supply can supply power to a load due to the characteristics of current, and when the voltage of the standby power supply is higher, the standby power supply can supply power to the load. Today, with the rapid development of intelligence, the conventional power supply method of the main power supply and the standby power supply obviously cannot meet the requirements of intelligent products, and therefore needs to be improved urgently.
SUMMERY OF THE UTILITY MODEL
In view of the above problem, the embodiment of the utility model provides a supply circuit and electronic equipment can be according to the electric quantity change of main power supply, and automatic switch-over main power supply and stand-by power supply satisfy the requirement of intelligent product now.
The embodiment of the utility model provides an adopt following technical scheme to realize:
a power supply circuit is applied to a power supply system with a main power supply and a standby power supply, wherein the power supply system supplies power to a load circuit through the main power supply or the standby power supply, and is characterized by comprising a sampling module, a control module and a switch switching module; the sampling module is coupled to the main power supply and is used for sampling the voltage of the main power supply to output a first sampling signal; the control module is coupled to the sampling module and used for receiving the first sampling signal so as to output a switching signal according to the first sampling signal; and the switch switching module is coupled with the control module and is coupled with the main power supply and the standby power supply, and the switch switching module is used for receiving a switching signal and conducting a path between the main power supply and the load circuit or conducting a path between the standby power supply and the load circuit according to the switching signal.
Further, the control module includes a first comparing unit coupled to the sampling module, the first comparing unit is preset with a first reference voltage and is configured to compare a voltage value of the first sampling signal with the first reference voltage, and when the voltage value of the first sampling signal is smaller than the first reference voltage, the control module outputs a switching signal to the switch switching module, so that the switch switching module switches on a path between the standby power supply and the load circuit.
Furthermore, the sampling module is also coupled to the standby power supply and is used for sampling the voltage of the standby power supply to output a second sampling signal to the control module; the control module further comprises a second comparison unit coupled to the sampling module, the second comparison unit is used for comparing the voltage value of the first sampling signal with the voltage value of the second sampling signal, and when the voltage value of the first sampling signal is smaller than the first reference voltage and the voltage value of the first sampling signal is smaller than the voltage value of the second sampling signal, the control module outputs a switching signal to the switch switching module, so that the switch switching module switches on a path between the standby power supply and the load circuit.
The sampling module comprises a first sampling unit and a second sampling unit, wherein the first sampling unit is coupled to the main power supply and used for sampling the voltage of the main power supply to output a first sampling signal, and the second sampling unit is coupled to the standby power supply and used for sampling the voltage of the standby power supply to output a second sampling signal; the first sampling unit comprises a first resistor and a second resistor, one end of the first resistor is coupled with the main power supply, the other end of the first resistor is connected with the second resistor in series and then is grounded, and a connection node of the first resistor and the second resistor is coupled to the control module; the second sampling unit comprises a third resistor and a fourth resistor, one end of the third resistor is coupled with the standby power supply, the other end of the third resistor is connected with the fourth resistor in series and then is grounded, and a connection node of the third resistor and the fourth resistor is coupled to the control module.
Further, the switch switching module includes: a first switch unit coupled to the control module and coupled to the main power supply; the second switch unit is coupled with the control module and the standby power supply; wherein the first switching unit includes: the grid electrode of the first MOS tube is coupled to the control module, and the source electrode of the first MOS tube is grounded; the grid electrode of the second MOS tube is coupled to the drain electrode of the first MOS tube, and the source electrode of the second MOS tube is coupled to the main power supply; the grid electrode of the third MOS tube is coupled to the control module, and the source electrode of the third MOS tube is grounded; a grid electrode of the fourth MOS tube is coupled to a drain electrode of the third MOS tube, a drain electrode of the fourth MOS tube is coupled to a drain electrode of the second MOS tube, and a source electrode of the fourth MOS tube is used for being coupled to a load circuit; the second switching unit includes: a grid electrode of the fifth MOS tube is coupled to the control module, and a source electrode of the fifth MOS tube is grounded; and the grid electrode of the sixth MOS tube is coupled to the drain electrode of the fifth MOS tube, the source electrode of the sixth MOS tube is coupled to the standby power supply, and the drain electrode of the sixth MOS tube is coupled to the source electrode of the fourth MOS tube.
Furthermore, the power supply circuit further comprises a first diode coupled between the standby power supply and the sixth MOS transistor, wherein the anode of the first diode is coupled to the standby power supply, and the cathode of the first diode is coupled to the source of the sixth MOS transistor; and the anode of the second diode is coupled to the source of the fourth MOS transistor and the drain and the cathode of the sixth MOS transistor and is used for being coupled to the load circuit.
Furthermore, the power supply circuit further comprises a power management module coupled between the standby power supply and the control module, the power management module is further coupled to the main power supply, and the power management module is used for switching on or off a power supply path between the standby power supply and the control module according to the voltage of the main power supply.
The power management module further comprises a third comparing unit coupled to the main power supply, a second reference voltage is preset in the third comparing unit, the third comparing unit is used for comparing the voltage of the main power supply with the second reference voltage, and when the voltage of the main power supply is smaller than the second reference voltage, the third comparing unit outputs a trigger signal; and a third switching unit, one end of which is coupled to the third comparing unit and the other end of which is coupled between the standby power supply and the control module, the third switching unit being used for receiving the trigger signal and conducting a power supply path between the standby power supply and the control module according to the trigger signal.
Further, the third switching unit includes: a grid electrode of the seventh MOS tube is coupled to the output end of the third comparison unit, the drain electrode of the seventh MOS tube is coupled to the standby power supply, and the source electrode of the seventh MOS tube is grounded; the grid electrode of the eighth MOS tube is coupled between the standby power supply and the drain electrode of the seventh MOS tube, and the source electrode of the eighth MOS tube is coupled with the standby power supply and the drain electrode of the seventh MOS tube is grounded; and a ninth MOS transistor, wherein the gate of the ninth MOS transistor is coupled between the drain of the eighth MOS transistor and the ground, the source of the ninth MOS transistor is coupled to the standby power supply, and the drain of the ninth MOS transistor is coupled to the power supply terminal of the control module.
Further, the power supply circuit further includes: the third diode is coupled between the main power supply and the control module, and the anode of the third diode is coupled with the main power supply and the cathode of the third diode is coupled with the power supply end of the control module; and the anode of the fourth diode is coupled to the drain of the ninth MOS transistor, and the cathode of the fourth diode is coupled to the power supply end of the control module.
The utility model also provides an electronic equipment, including the equipment main part, locate the electronic component in the equipment main part and locate the equipment main part in as above-mentioned supply circuit, wherein, the supply circuit coupling is in electronic component's power supply loop.
The embodiment of the utility model provides a power supply circuit is applied to the power supply system who has main power source and stand-by power supply, power supply system supplies power for load circuit through main power source or stand-by power supply, wherein, power supply circuit is provided with sampling module, control module and switch switching module; sampling module samples the voltage of main power source and output first sampling signal to control module, control module receives first sampling signal and exports switching signal to switch switching module according to first sampling signal, switch switching module receives switching signal and switches on the route between main power source and the load circuit or switches on the route between stand-by power supply and the load circuit according to switching signal, therefore, the utility model discloses a power supply circuit, through introduction sampling module, control module and switch switching module, can be according to the voltage variation of the main power source that sampling module acquireed, through switch switching module automatic switch main power source and stand-by power supply, satisfy the requirement of intelligent product today.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 shows a schematic diagram of a prior art power supply system.
Fig. 2 shows a block diagram of a power supply circuit according to an embodiment of the present invention.
Fig. 3 shows a block diagram of another power supply circuit provided by the embodiment of the present invention.
Fig. 4 shows a schematic circuit diagram of the sampling module and the switch switching module in fig. 2.
Fig. 5 is a block diagram illustrating another power supply circuit according to an embodiment of the present invention.
Fig. 6 shows a schematic circuit diagram of the power management module in fig. 5.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
At present, in electronic equipment, a main power supply and a standby power supply are generally adopted to supply power so as to improve the stability of the power supply of the electronic equipment. As shown in fig. 1, fig. 1 is a prior art power supply system 10. In the power supply system 10, a main power supply supplies power to a load circuit through a main power supply loop; the standby power supply supplies power to the load circuit through the standby power supply loop. The principle of the power supply system 10 for supplying power to the load circuit is as follows: when the potential of the main power supply is higher than that of the standby power supply, the current of the main power supply flows to the load circuit due to the characteristic of the current, and the load circuit is powered by the main power supply through the main power supply loop; when the potential of the backup power supply is higher than the potential of the main power supply, the current of the backup power supply flows to the load circuit, and the load circuit is supplied by the backup power supply through the backup power supply loop. Obviously, the conventional power supply system 10 switches the power supply only by the potential difference between the main power supply and the backup power supply. However, today with the rapid development of intelligence, the conventional power supply method of the main power supply and the standby power supply obviously cannot meet the requirements of intelligent products, and therefore, needs to be improved urgently.
In order to solve the above problems, the inventor has made a long-term study, and proposes a power supply circuit and an electronic device in the embodiments of the present invention, which are applied to a power supply system having a main power source and a standby power source, the power supply system supplying power to a load circuit through the main power source or the standby power source, wherein the power supply circuit is provided with a sampling module, a control module, and a switch switching module; sampling module samples the voltage of main power source and output first sampling signal to control module, control module receives first sampling signal and exports switching signal to switch switching module according to first sampling signal, switch switching module receives switching signal and switches on the route between main power source and the load circuit or switches on the route between stand-by power supply and the load circuit according to switching signal, therefore, the utility model discloses a power supply circuit, through introduction sampling module, control module and switch switching module, can be according to the voltage variation of the main power source that sampling module acquireed, through switch switching module automatic switch main power source and stand-by power supply, satisfy the requirement of intelligent product today.
In order to make the technical field person understand the scheme of the present invention better, the following will combine the drawings in the embodiments of the present invention to perform clear and complete description on the technical scheme in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 2, fig. 2 schematically illustrates a power supply circuit 100 according to an embodiment of the present invention, where the power supply circuit 100 may be applied to the power supply system 10. The power supply circuit 100 includes a sampling module 110, a control module 120, and a switch switching module 130. The sampling module 110 is coupled to a main power source and is configured to sample a voltage of the main power source to output a first sampling signal; the control module 120 is coupled to the sampling module 110 and configured to receive the first sampling signal and output a switching signal according to the first sampling signal; the switch switching module 130 is coupled to the control module 120 and coupled to the main power source and the standby power source, and the switch switching module 130 is configured to receive a switching signal and conduct a path between the main power source and the load circuit or conduct a path between the standby power source and the load circuit according to the switching signal.
The embodiment of the utility model provides a supply circuit 100 is through the voltage of sampling main power supply, and then makes control module 120 output switching signal to switch over module 130, so that switch over module 130 switches on the route between main power supply and the load circuit or switches on the route between stand-by power supply and the load circuit, and then automatically switch over main power supply or stand-by power supply for the load circuit power supply, satisfy the requirement of intelligent product today, and satisfy user's demand.
Specifically, as shown in fig. 3, the control module 120 includes a first comparing unit 121, and the first comparing unit 121 is coupled to the sampling module 110 and preset with a first reference voltage. The first comparing unit 121 is configured to compare a voltage value of the first sampling signal output by the sampling module 110 with a first reference voltage, and when the voltage value of the first sampling signal is smaller than the first reference voltage, the control module 120 outputs a switching signal to the switch switching module 130, so that the switch switching module 130 switches on a path between the standby power supply and the load circuit, thereby switching on the standby power supply loop; accordingly, when the voltage value of the first sampling signal is greater than or equal to the first reference voltage, the control module 120 outputs a switching signal to the switch switching module 130, so that the switch switching module 130 cuts off a path between the standby power supply and the load circuit, thereby turning off the standby power supply loop. It should be noted that when the control module 120 outputs the switching signal to the switch switching module 130, the switch switching module 130 only conducts one of the power supply loops, that is, when the main power supply loop is conducted, the standby power supply loop is in an off state; correspondingly, when the standby power supply loop is conducted, the main power supply loop is in an off state.
In this embodiment, the first reference voltage may be preset by a tester to adapt to an optimal power supply state of the main power supply. When the first reference voltage is set to be lower than the voltage of the backup power supply, even if the voltage of the main power supply drops to the voltage of the backup power supply, as long as the voltage of the main power supply is still greater than or equal to the voltage of the first reference voltage, the load circuit is still powered through the main power supply loop. Accordingly, when the first reference voltage is set higher than the voltage of the backup power supply, the main power supply is switched to the backup power supply to supply power to the load circuit through the backup power supply loop when the voltage of the main power supply is less than the voltage of the first reference voltage even though the voltage of the main power supply has not yet dropped to the voltage of the backup power supply. Of course, the first reference voltage setting may also be the same as the voltage of the backup power supply. In some embodiments, the first reference voltage may also be set by the user.
Further, the sampling module 110 is also coupled to the standby power supply and is configured to sample a voltage of the standby power supply to output a second sampling signal to the control module 120. The control module 120 further includes a second comparing unit 122 coupled to the sampling module 110, the second comparing unit 122 is further connected to the first comparing unit 121, the second comparing unit 122 is configured to compare the voltage value of the first sampling signal with the voltage value of the second sampling signal, and when the voltage value of the first sampling signal is smaller than the first reference voltage and the voltage value of the first sampling signal is smaller than the voltage value of the second sampling signal, the control module 120 outputs a switching signal to the switch switching module 130, so that the switch switching module 130 switches on a path between the standby power supply and the load circuit, thereby switching on the standby power supply loop. The first comparing unit 121 and the second comparing unit 122 may both adopt comparators.
In the embodiment, the current voltages of the main power supply and the standby power supply are sampled simultaneously, the current voltage of the main power supply is compared with the current voltage of the standby power supply, when the current voltage of the main power supply is smaller than the current voltage of the standby power supply and the set first reference voltage at the same time, the main power supply is switched to the standby power supply, and the load circuit is powered through the standby power supply loop, so that the main power supply is utilized to the maximum extent, and the utilization rate of energy is improved.
As shown in fig. 4, fig. 4 is a schematic circuit structure diagram of the sampling module 110 and the switch switching module 130 according to an embodiment of the present invention. In this embodiment, the main power source is a lithium battery VBAT-Li, and the backup battery is a Dry battery VBAT-Dry. In some embodiments, the primary and backup power sources may also be supercapacitors or other power circuits. The lithium battery is a rechargeable battery, can be circularly charged for many times, has no memory, and can be used as a main power supply. Although the dry battery is safe and stable, the dry battery contains heavy metal components, which is not beneficial to environmental protection, so the dry battery can be used as a standby power supply. Generally speaking, a lithium battery can adopt one lithium battery or a plurality of lithium batteries connected in parallel as a main power supply, and the voltage range of the lithium battery is 3.0V-4.3V; the dry battery usually adopts a plurality of dry batteries connected in series as a standby power supply, and the voltage range of the dry battery is 4.4-6.0V.
The sampling module 110 includes a first sampling unit 111 and a second sampling unit 112. The first sampling unit 111 is coupled to the main power source and is configured to sample a voltage of the main power source to output a first sampling signal; the second sampling unit 112 is coupled to the standby power supply and is configured to sample a voltage of the standby power supply to output a second sampling signal.
The first sampling unit 111 includes a first resistor R1 and a second resistor R2, wherein one end of the first resistor R1 is coupled to the main power source, the other end is connected in series with the second resistor R2 and then grounded, and a connection node between the first resistor R1 and the second resistor R2 is coupled to the control module 120; the second sampling unit 112 includes a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is coupled to the standby power supply, the other end is connected in series with the fourth resistor R4 and then grounded, and a connection node between the third resistor R3 and the fourth resistor R4 is coupled to the control module 120.
As shown in fig. 4 and fig. 6, in the embodiment, the control module 120 may be an MCU (micro controller Unit), and the control module 120 may include pin 1, pin 2, pin 3, pin 4, and pin 5. Wherein the pin 1 and the pin 2 are sampling pins, and the pin 1 is coupled to a connection node between the first resistor R1 and the second resistor R2; the pin 2 is coupled to a connection node between the third resistor R3 and the fourth resistor R4. The pins 3, 4 and 5 are driving pins, and the control module 120 outputs a first switching signal at the pin 3, a second switching signal at the pin 4 and a third switching signal at the pin 5 according to the sampling signal of the sampling module 110.
The switch switching module 130 includes a first switch unit 131 and a second switch unit 132. The first switch unit 131 is coupled to the control module 120, and is coupled between the main power supply and the load circuit, that is, coupled in the main power supply loop; the second switch unit 132 is coupled to the control module 120, and is coupled between the standby power and the load circuit, that is, coupled in the standby power loop.
Specifically, the first switch unit 131 includes a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, and a fourth MOS transistor Q4. The first MOS transistor Q1 is an N-MOS transistor; the second MOS tube Q2 is a P-MOS tube; the third MOS tube Q3 is an N-MOS tube; the fourth MOS transistor Q4 is a P-MOS transistor. In addition, the first switching unit 131 further includes a pull-down resistor R5, a pull-up resistor R6, a pull-down resistor R7, and a pull-up resistor R8. The gate G of the first MOS transistor Q1 is coupled to the pin 3 of the control module 120 for receiving the first switching signal, the source S is grounded, and the drain D is coupled to the gate G of the second MOS transistor Q2; one end of the pull-down resistor R5 is coupled to the gate G of the first MOS transistor Q1, and the other end is grounded; the source S of the second MOS transistor Q2 is coupled to the main power supply, and the drain D is coupled to the drain D of the fourth MOS transistor Q4; one end of the pull-up resistor R6 is coupled to the grid G of the second MOS transistor Q2, and the other end is coupled to a main power supply; the gate G of the third MOS transistor Q3 is coupled to the pin 4 of the control module 120 for receiving the second switching signal, the source S is grounded, and the drain D is coupled to the gate G of the fourth MOS transistor Q4; one end of the pull-down resistor R7 is coupled to the gate G of the third MOS transistor Q3, and the other end is grounded; the source S of the fourth MOS transistor Q4 is coupled to the load circuit and the standby power supply, and the drain D is coupled to the drain D of the second MOS transistor Q2; one end of the pull-up resistor R8 is coupled to the gate G of the fourth MOS transistor Q4, and the other end is coupled to the load circuit.
The second switching unit 132 includes a fifth MOS transistor Q5 and a sixth MOS transistor Q6. The fifth MOS transistor Q5 is an N-MOS transistor; the sixth MOS transistor Q6 is a P-MOS transistor. In addition, the second switching unit 132 further includes a pull-down resistor R9 and a pull-up resistor R10. A gate G of the fifth MOS transistor Q5 is coupled to the pin 5 of the control module 120 for receiving the third switching signal, a source S is grounded, and a drain D is coupled to the gate G of the sixth MOS transistor Q6; one end of the pull-down resistor R9 is coupled to the gate G of the fifth MOS transistor Q5, and the other end is grounded; the source S of the sixth MOS transistor Q6 is coupled to the standby power supply, the drain D is coupled to the load circuit and the source S of the fourth MOS transistor Q4; one end of the pull-up resistor R10 is coupled to the gate G of the sixth MOS transistor Q6, and the other end is coupled to the standby power supply.
In addition, the power supply circuit 100 further includes a first diode D1 and a second diode D2. The first diode D1 is coupled between the standby power supply and the sixth MOS transistor Q6. Specifically, the anode of the first diode D1 is coupled to the standby power supply, and the cathode is coupled to the source of the sixth MOS transistor Q6. The second diode D2 is coupled between the connection node of the fourth MOS transistor Q4 and the sixth MOS transistor Q6 and the load circuit. Specifically, the anode of the second diode D2 is coupled to the source S of the fourth MOS transistor Q4, and the drain D and the cathode of the sixth MOS transistor are coupled to the load circuit.
The circuit principle of the power supply circuit provided by the embodiment is as follows:
first, the control module 120 outputs a first switching signal with a high level to the first MOS transistor Q1, or outputs a second switching signal with a high level to the third MOS transistor Q3, and outputs a third switching signal with a low level to the fifth MOS transistor Q5 by default. The control module 120 receives the voltage sampling signals of the main power supply and the standby power supply through pins 1 and 2, respectively, and compares the voltage sampling signals of the main power supply with a first reference voltage through the first comparison unit 121, and compares the voltage sampling signals of the main power supply with the voltage sampling signals of the standby power supply through the second comparison unit 122. The first comparing unit 121 and the second comparing unit 122 may be implemented by comparators. When the voltage sampling signal of the main power supply is smaller than the first reference voltage and the voltage sampling signal of the main power supply is smaller than the voltage sampling signal of the standby power supply, the situation shows that the power of the main power supply is insufficient, and the standby power supply is more suitable for supplying power than the main power supply. Therefore, at this time, the control module 120 outputs the first switching signal with low level to the first MOS transistor Q1 to turn off the first MOS transistor Q1, and simultaneously outputs the second switching signal with low level to the third MOS transistor Q3 to turn off the third MOS transistor Q3, and outputs the second switching signal with high level to the fifth MOS transistor Q5 to turn on the fifth MOS transistor Q5. When the first MOS transistor Q1 is turned off, the gate voltage of the second MOS transistor Q2 is pulled high, and at this time, the second MOS transistor Q2 is turned off; when the third MOS transistor Q3 is turned off, the gate voltage of the fourth MOS transistor Q4 is also pulled high, and at this time, the fourth MOS transistor Q4 is also turned off, so that the main power supply loop is turned off. When the fifth MOS transistor Q5 is turned on, the gate voltage of the sixth MOS transistor Q6 is pulled low, and the sixth MOS transistor Q6 is turned on, so that the standby power supply loop is turned on, and the power supply from the main power supply loop is switched to the power supply from the standby power supply loop. In addition, the first diode D1 and the second diode D2 can prevent the current from flowing backward.
It should be noted that, when the load circuit is powered by the main power supply loop, the power supply of the entire load circuit can be satisfied, and at this time, the current only flows through the second MOS transistor Q2 and the sixth MOS transistor Q6, because the internal resistances of the second MOS transistor Q2 and the sixth MOS transistor Q6 are very small, the circuit loss caused by the second MOS transistor Q2 and the sixth MOS transistor Q6 is very small, and therefore, the loss caused by the power supply circuit is also very small at this time. When the load circuit is powered by the standby power supply loop, part of devices with larger power consumption in the load circuit can be turned off, and at the moment, the high-power devices in the load circuit are turned off, and current only flows through the sixth MOS tube with small internal resistance, so that the loss caused by the power supply circuit is also small. In summary, when the power supply circuit 100 switches between the main power supply and the standby power supply, the circuit loss is small, the energy utilization rate is high, the energy is saved, and the cost is low.
Further, as shown in fig. 5, the power supply circuit further includes a power management module 140 coupled between the standby power and the control module 120, and the power management module 140 is further coupled to the main power. The power management module 140 is used to turn on or off a power supply path between the standby power supply and the control module 120 according to the voltage of the main power supply.
When the main power supply has sufficient electric quantity, the control module 120 does not need to be powered by the standby power supply, so the power management module 140 can turn off the power supply path between the standby power supply and the control module 120; when the power of the main power is insufficient, the control module 120 can be powered by the backup power, so the power management module 140 can conduct a power supply path between the backup power and the control module 120, and automatically switch the power supply of the control module 120.
Specifically, as shown in fig. 6, the power management module 140 includes a third comparing unit 141 and a third switching unit 142. The third comparing unit 141 is coupled to the main power source, a second reference voltage is preset in the third comparing unit 141, the third comparing unit 141 is configured to compare the voltage of the main power source with the second reference voltage, and when the voltage of the main power source is smaller than the second reference voltage, the third comparing unit 141 outputs a trigger signal. In this embodiment, the third comparing unit 141 is a comparator a 1.
The third switching unit 142 has one end coupled to the third comparing unit 141 and the other end coupled between the standby power and the control module 120, and the third switching unit 142 is configured to receive the trigger signal output by the third comparing unit 141 and conduct a power supply path before the standby power and the control module 120 according to the trigger signal.
Specifically, the third switching unit 142 includes a seventh MOS transistor Q7, an eighth MOS transistor Q8, and a ninth MOS transistor Q9. The seventh MOS transistor Q7 is an N-MOS transistor; the eighth MOS transistor Q8 is a P-MOS transistor; the ninth MOS transistor Q9 is a P-MOS transistor. In addition, the power management module 140 further includes a pull-up resistor R11, a pull-up resistor R12, and a pull-down resistor R13. A gate G of the seventh MOS transistor Q7 is coupled to the output terminal of the third comparing unit 141, a source S is grounded, and a drain D is coupled to the gate G of the eighth MOS transistor Q8; one end of the pull-up resistor R11 is coupled to the main power supply, and the other end is coupled to the grid G of the seventh MOS transistor Q7; the gate G of the eighth MOS transistor Q8 is coupled between the standby power supply and the drain D of the seventh MOS transistor Q7, the source S is coupled to the standby power supply, and the drain D is grounded; one end of the pull-up resistor R12 is coupled to the standby power supply, and the other end is coupled to the gate G of the eighth MOS transistor Q8; the gate G of the ninth MOS transistor Q9 is coupled between the drain D of the eighth MOS transistor Q8 and ground, the source S is coupled to the standby power supply, and the drain D is coupled to the power supply terminal of the control module 120, wherein the power supply terminal of the control module 120 is the pin 6.
In addition, the power supply circuit 100 further includes a third diode D3 and a fourth diode D4. The third diode D3 is coupled between the main power supply and the control module 120. Specifically, the third diode D3 is coupled in a power supply path for supplying power to the control module 120 from the main power source, and the anode of the third diode D3 is coupled to the main power source and the cathode is coupled to the power source terminal of the control module 120. The fourth diode D4 is coupled between the backup power source and the control module 120. Specifically, the anode of the fourth diode D4 is coupled to the drain D of the ninth MOS transistor, and the cathode is coupled to the power source terminal of the control module 120.
Further, the power supply circuit further includes an LDO (low dropout regulator). The LDO is coupled between the power supply terminal of the control module 120 and the main power supply and the standby power supply. The LDO enables a stable output of the power supply voltage to the control module 120 and effectively suppresses system noise.
The circuit principle of the power management module 140 provided in this embodiment is as follows:
first, when the main power supply is sufficient, the control module 120 is only powered by the main power supply, that is, the ninth MOS transistor Q9 is in an off state at this time. The comparator a1 compares the voltage of the main power supply with a second reference voltage. In an embodiment, the second reference voltage may be set to 3.4V. When the voltage of the main power supply is lower than the second reference voltage, which indicates that the power of the main power supply is insufficient, the comparator a1 outputs a low trigger signal to the seventh MOS transistor Q7 to turn off the seventh MOS transistor Q7. When the seventh MOS transistor Q7 is turned off, the gate voltage of the eighth MOS transistor Q8 is pulled high, and at the same time, the eighth MOS transistor Q8 is also turned off. When the eighth MOS transistor Q8 is turned off, the gate voltage of the ninth MOS transistor Q9 is pulled low, and therefore the ninth MOS transistor Q9 is turned on. It should be noted that the power supply path from the primary power source to the control module 120 is conducted simultaneously with the power supply path from the backup power source to the control module 120, and therefore, the power supply of the control module 120 depends on the potentials of the primary power source and the backup power source. When the voltage of the backup power is higher than the voltage of the main power, the control module 120 is powered by the backup power; when the voltage of the backup power supply is lower than the voltage of the main power supply, the control module 120 is still powered by the main power supply. The LDO stabilizes the voltage of the main power supply or the standby power supply to 3.3VB and outputs the stabilized voltage to the control module 120. In addition, the third diode D3 and the fourth diode D4 can prevent the current from flowing backward.
The embodiment of the utility model provides a power supply circuit is applied to the power supply system who has main power source and stand-by power supply, power supply system supplies power for load circuit through main power source or stand-by power supply, wherein, power supply circuit is provided with sampling module, control module and switch switching module; sampling module samples the voltage of main power source and output first sampling signal to control module, control module receives first sampling signal and exports switching signal to switch switching module according to first sampling signal, switch switching module receives switching signal and switches on the route between main power source and the load circuit or switches on the route between stand-by power supply and the load circuit according to switching signal, therefore, the utility model discloses a power supply circuit, through introduction sampling module, control module and switch switching module, can be according to the voltage variation of the main power source that sampling module acquireed, through switch switching module automatic switch main power source and stand-by power supply, satisfy the requirement of intelligent product today.
An embodiment of the present invention further provides an electronic device, which includes a device main body, an electronic component and the above-mentioned power supply circuit. The electronic element and the power supply circuit are both arranged in the equipment main body, and the power supply circuit is coupled to the electronic element to supply power to the electronic element. When the power is supplied through the main power supply, the power supply requirements of all electronic components can be met; when the power is supplied by the standby power supply, some high-power devices in the electronic elements can be turned off to save the electric energy.
The embodiment of the utility model provides an electronic equipment is provided with a sampling module, a control module and a switch switching module; the sampling module samples the voltage of the main power supply and outputs a first sampling signal to the control module, the control module receives the first sampling signal and outputs a switching signal to the switch switching module according to the first sampling signal, the switch switching module receives the switching signal and switches on a path between the main power supply and a load circuit or switches on a path between the standby power supply and the load circuit according to the switching signal, and therefore the main power supply and the standby power supply can be automatically switched according to the voltage change of the main power supply, and the requirements of modern intelligent products are met.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed by the preferred embodiment, it is not limited to the present invention, and any person skilled in the art can make modifications or changes equivalent to the equivalent embodiments by utilizing the above disclosed technical contents without departing from the technical scope of the present invention, but all the modifications, changes and changes of the technical spirit of the present invention made to the above embodiments are also within the scope of the technical solution of the present invention.
Claims (11)
1. A power supply circuit for use in a power supply system having a primary power source and a backup power source, wherein the power supply system supplies power to a load circuit via the primary power source or the backup power source, comprising:
the sampling module is coupled to the main power supply and used for sampling the voltage of the main power supply to output a first sampling signal;
a control module, coupled to the sampling module, for receiving the first sampling signal and outputting a switching signal according to the first sampling signal; and
and the switch switching module is coupled to the control module and the main power supply and the standby power supply, and is used for receiving the switching signal and conducting a path between the main power supply and the load circuit or conducting a path between the standby power supply and the load circuit according to the switching signal.
2. The power supply circuit according to claim 1, wherein the control module includes a first comparing unit coupled to the sampling module, the first comparing unit is preset with a first reference voltage and configured to compare a voltage value of the first sampling signal with the first reference voltage, and when the voltage value of the first sampling signal is smaller than the first reference voltage, the control module outputs the switching signal to the switching module, so that the switching module switches on a path between the standby power supply and the load circuit.
3. The power supply circuit of claim 2, wherein the sampling module is further coupled to the backup power supply and configured to sample a voltage of the backup power supply to output a second sampling signal to the control module; the control module further comprises a second comparing unit coupled to the sampling module, the second comparing unit is used for comparing the voltage value of the first sampling signal with the voltage value of the second sampling signal, and when the voltage value of the first sampling signal is smaller than the first reference voltage and the voltage value of the first sampling signal is smaller than the voltage value of the second sampling signal, the control module outputs the switching signal to the switch switching module, so that the switch switching module switches on the path between the standby power supply and the load circuit.
4. The power supply circuit of claim 3, wherein the sampling module comprises:
the first sampling unit is coupled to the main power supply and used for sampling the voltage of the main power supply to output the first sampling signal; wherein the first sampling unit includes:
the power supply circuit comprises a main power supply, a first resistor and a second resistor, wherein one end of the first resistor is coupled with the main power supply, the other end of the first resistor is connected with the second resistor in series and then is grounded, and a connection node of the first resistor and the second resistor is coupled with the control module; and
the second sampling unit is coupled to the standby power supply and used for sampling the voltage of the standby power supply to output the second sampling signal; wherein the second sampling unit includes:
the power supply comprises a first resistor, a second resistor and a control module, wherein one end of the first resistor is coupled with the standby power supply, the other end of the first resistor is connected with the second resistor in series and then is grounded, and a connection node of the first resistor and the second resistor is coupled with the control module.
5. The power supply circuit of claim 3, wherein the switch switching module comprises: a first switch unit coupled to the control module and coupled to the main power supply; and a second switch unit coupled to the control module and coupled to the standby power supply;
wherein the first switching unit includes:
the grid electrode of the first MOS tube is coupled to the control module, and the source electrode of the first MOS tube is grounded;
a gate of the second MOS transistor is coupled to a drain of the first MOS transistor, and a source of the second MOS transistor is coupled to the main power supply;
a gate of the third MOS transistor is coupled to the control module, and a source of the third MOS transistor is grounded;
a gate of the fourth MOS transistor is coupled to a drain of the third MOS transistor, a drain of the fourth MOS transistor is coupled to a drain of the second MOS transistor, and a source of the fourth MOS transistor is coupled to the load circuit;
the second switching unit includes:
a gate of the fifth MOS transistor is coupled to the control module, and a source thereof is grounded;
a gate of the sixth MOS transistor is coupled to a drain of the fifth MOS transistor, a source of the sixth MOS transistor is coupled to the standby power supply, and a drain of the sixth MOS transistor is coupled to a source of the fourth MOS transistor.
6. The power supply circuit of claim 5, wherein the power supply circuit further comprises:
a first diode coupled between the standby power supply and the sixth MOS transistor, wherein an anode of the first diode is coupled to the standby power supply, and a cathode of the first diode is coupled to a source of the sixth MOS transistor; and
the second diode is coupled between the source electrode of the fourth MOS transistor and a connection node of the sixth MOS transistor and the load circuit, and the anode of the second diode is coupled to the source electrode of the fourth MOS transistor and the drain and the cathode of the sixth MOS transistor and is coupled to the load circuit.
7. The power supply circuit according to any one of claims 1 to 6, wherein the power supply circuit further comprises a power management module coupled between the backup power source and the control module, the power management module is further coupled to the main power source, and the power management module is configured to turn on or off a power supply path between the backup power source and the control module according to a voltage of the main power source.
8. The power supply circuit of claim 7 wherein said power management module comprises:
a third comparing unit, coupled to the main power supply, preset with a second reference voltage, for comparing the voltage of the main power supply with the second reference voltage, and outputting a trigger signal when the voltage of the main power supply is smaller than the second reference voltage; and
and one end of the third switching unit is coupled to the third comparing unit, the other end of the third switching unit is coupled between the standby power supply and the control module, and the third switching unit is used for receiving the trigger signal and conducting a power supply path between the standby power supply and the control module according to the trigger signal.
9. The power supply circuit according to claim 8, wherein the third switching unit includes:
a gate of the seventh MOS transistor is coupled to the output end of the third comparing unit, a drain of the seventh MOS transistor is coupled to the standby power supply, and a source of the seventh MOS transistor is grounded;
a gate of the eighth MOS transistor is coupled between the standby power supply and a drain of the seventh MOS transistor, and a source of the eighth MOS transistor is coupled to the standby power supply and a drain of the seventh MOS transistor is grounded; and
a ninth MOS transistor, a gate of which is coupled between a drain of the eighth MOS transistor and a ground, a source of which is coupled to the standby power supply, and a drain of which is coupled to a power supply terminal of the control module.
10. The power supply circuit of claim 9, wherein the power supply circuit further comprises:
a third diode coupled between the main power source and the control module, wherein an anode of the third diode is coupled to the main power source, and a cathode of the third diode is coupled to a power source end of the control module; and
and the anode of the fourth diode is coupled to the drain of the ninth MOS transistor, and the cathode of the fourth diode is coupled to the power supply end of the control module.
11. An electronic device comprising a device body, an electronic component disposed in the device body, and the power supply circuit according to any one of claims 1 to 10 disposed in the device body, wherein the power supply circuit is coupled in a power supply loop of the electronic component.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020296125.4U CN212033826U (en) | 2020-03-11 | 2020-03-11 | Power supply circuit and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020296125.4U CN212033826U (en) | 2020-03-11 | 2020-03-11 | Power supply circuit and electronic device |
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| CN212033826U true CN212033826U (en) | 2020-11-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115113669A (en) * | 2021-03-23 | 2022-09-27 | 圣邦微电子（北京）股份有限公司 | Power supply circuit and power supply method |
| CN117977531A (en) * | 2024-03-29 | 2024-05-03 | 杭州径上科技有限公司 | Self-adaptive power supply device, system and method |
| WO2024125000A1 (en) * | 2022-12-13 | 2024-06-20 | 深圳市广和通无线股份有限公司 | Power supply switching circuit and apparatus, and system |
-
2020
- 2020-03-11 CN CN202020296125.4U patent/CN212033826U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115113669A (en) * | 2021-03-23 | 2022-09-27 | 圣邦微电子（北京）股份有限公司 | Power supply circuit and power supply method |
| CN115113669B (en) * | 2021-03-23 | 2024-04-09 | 圣邦微电子（北京）股份有限公司 | Power supply circuit and power supply method |
| WO2024125000A1 (en) * | 2022-12-13 | 2024-06-20 | 深圳市广和通无线股份有限公司 | Power supply switching circuit and apparatus, and system |
| CN117977531A (en) * | 2024-03-29 | 2024-05-03 | 杭州径上科技有限公司 | Self-adaptive power supply device, system and method |
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