CN117578699A - Uninterrupted switching load power supply system based on two paths of power supplies - Google Patents
Uninterrupted switching load power supply system based on two paths of power supplies Download PDFInfo
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- CN117578699A CN117578699A CN202410065726.7A CN202410065726A CN117578699A CN 117578699 A CN117578699 A CN 117578699A CN 202410065726 A CN202410065726 A CN 202410065726A CN 117578699 A CN117578699 A CN 117578699A
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- 239000003990 capacitor Substances 0.000 claims description 7
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- 230000001052 transient effect Effects 0.000 abstract description 3
- 230000006641 stabilisation Effects 0.000 abstract 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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Abstract
The invention discloses a non-outage switching load power supply system based on two paths of power supplies, when the power supply of the power supply system is switched from a second power supply to a first power supply, a detection end of the first power supply detects a power-off signal of the second power supply when the second power supply is powered off, so that a switch of the first power supply is driven to be turned on and connected to a load, and the switch of the second power supply is turned off and the load is turned off; when the power supply source of the power supply system is switched from the first power source to the second power source, the detection end of the second power source detects the power-off signal of the first power source when the first power source is powered off, so that the switch of the second power source is driven to be turned on and connected to a load, the switch of the first power source is turned off, and the load is disconnected. The scheme of the invention carries out switching control of the power supply based on the switch with good transient response, can quickly detect power supply switching, uses capacitance voltage stabilization, can set voltage drop in a required range, prevents two paths of power supplies from being conducted at the same time, avoids short circuit risk, has simple architecture and stable circuit and is easy to realize.
Description
Technical Field
The invention belongs to the field of power supplies, and particularly relates to a uninterruptible power switching load power supply system based on two paths of power supplies.
Background
In modern society, power supply systems are becoming one of the indispensable infrastructures. The stability and reliability of the power supply system not only affect the normal operation of the industry, but also relate to the safety and convenience of people's life. It plays an important role in industrial production, commercial operation, medical care, technological innovation and the like. Therefore, ensuring the stability and reliability of electric power has an irreplaceable role in promoting the stable development of socioeconomic.
The stability of the power supply system directly influences the normal operation of production and life. For example, voltage fluctuation, low voltage, unstable voltage and the like of a power supply system can influence the safety of equipment, and threaten lives and properties of personnel. The power supply system is directly powered off when an accident occurs, and the accident can be developed into a global accident.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a uninterruptible power switching load power supply system based on two power supplies.
The specific technical scheme for realizing the purpose of the invention is as follows:
a switching load power supply system without power outage based on two paths of power supplies comprises a first power supply, a second power supply, a load and a switch;
the first power supply and the second power supply are connected in parallel through a switch and are connected with a load;
the first power supply and the second power supply power the load under the control of the switch.
Further, when the power supply source of the power supply system is switched from the second power source to the first power source, and the second power source is powered off, the detection end of the first power source detects a power-off signal of the second power source, so that the switch of the first power source is driven to be turned on and connected to a load, the switch of the second power source is turned off, and the load is disconnected;
when the power supply of the power supply system is switched from the first power supply to the second power supply, and the first power supply is powered off, the detection end of the second power supply detects the power-off signal of the first power supply, so that the switch of the second power supply is driven to be turned on and connected to the load, the switch of the first power supply is turned off, and the load is disconnected.
Further, the system further comprises a voltage stabilizing capacitor, voltage is stabilized when the first power supply and the second power supply are switched to supply power, and voltage drop is prevented.
Further, the system further comprises a first resistor, and the switch comprises a first MOS tube and a first diode;
the grid electrode of the first MOS tube is respectively connected with the first resistor and the second power supply, and the other end of the first resistor is grounded;
the second power supply is connected with the positive electrode of the first diode, and the negative electrode of the first diode is connected with the source electrode of the first MOS tube and the load.
Further, when the power supply of the power supply system is switched from the second power supply to the first power supply, the second power supply is powered off, the drain electrode of the first MOS tube detects low level from the previous high level, the first MOS tube is opened, the first power supply is connected to a load in a conducting manner, and meanwhile, the first power supply cannot flow to the second power supply through the first diode;
when the power supply of the power supply system is switched from a first power supply to a second power supply, the first power supply is powered off, the drain electrode of the first MOS tube detects a high level from a previous low level, the first MOS tube is closed, the first power supply is disconnected from a load, and the second power supply is connected with the load through a first diode.
Further, the system also comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a comparator; the switch comprises a first MOS tube and a second MOS tube;
the first power supply is connected with the drain electrode of the first MOS tube, the grid electrode of the first MOS tube is respectively connected with the first resistor, the second resistor and the second output end of the comparator, the other end of the first resistor is connected with VCC voltage, and the other end of the second resistor is grounded; the drain electrode of the first MOS tube is connected with a load;
the source electrode of the second MOS tube is connected with a second power supply, the grid electrode of the second MOS tube is connected with a third resistor and the first output end of the comparator, and the other end of the third resistor is connected with VCC voltage; the drain electrode of the second MOS tube is connected with a load;
the first input end of the comparator is connected with the second power supply, and the second input end of the comparator is connected with the reference voltage VREF_DAC through the fourth resistor.
Further, when the power supply of the power supply system is switched from the second power supply to the first power supply, the second power supply is powered off, and at the moment, the voltage of the first input end of the comparator U1 is smaller than the voltage of the second input end of the comparator, the first output end of the comparator outputs a high level, and the second output end of the comparator outputs a low level; the drain electrode of the first MOS tube detects the low level of the second output end of the comparator, and the drain electrode of the second MOS tube detects the high level output by the first output end of the comparator, so that the first MOS tube is driven to be opened and turned on, the first power supply is connected to a load, the second MOS tube is closed, and the second power supply is disconnected from the load;
when the power supply of the power supply system is switched from a first power supply to a second power supply, the first power supply is powered off, the voltage of the first input end of the comparator is larger than the voltage of the second input end of the comparator, the first output end of the comparator outputs a low level, and the second output end of the comparator outputs a high level; the drain electrode of the first MOS tube detects the high level output by the second output end of the comparator, the drain electrode of the second MOS tube detects the low level output by the first output end of the comparator, so that the first MOS tube is driven to be closed, the first power supply is disconnected from a load, the second MOS tube is opened, and the second power supply is connected with the load.
Further, the system also comprises a first resistor, a second resistor, a relay and a comparator, wherein the switch is a first diode;
the first power supply and the second power supply are respectively connected with a pin 2 and a pin 4 of the relay, and a pin 3 of the relay is connected with a load;
the reverse input end IN-and the forward input end IN+ of the comparator are respectively connected with a second power supply and a reference voltage VREF_DAC, and the output end of the comparator is respectively connected with a first resistor, a pin 5 of the relay and the cathode of the first diode; the other end of the first resistor is connected with VCC voltage;
the anode of the first diode is grounded, and the 1 pin of the relay is grounded.
Further, when the power supply of the power supply system is switched from the first power supply to the second power supply, the first power supply is powered off, the voltage of the reverse input end IN & lt- & gt of the comparator is larger than that of the forward input end IN & lt+ & gt, the output end of the comparator outputs a low level, the relay is IN a closed and suction state, the pins 2 and 3 of the relay are conducted, the pins 4 and 3 are disconnected, the first power supply is connected with a load, and the second power supply is disconnected with the load;
when the power supply of the power supply system is switched from the second power supply to the first power supply, the second power supply is powered off, the voltage of the reverse input end IN & lt- & gt of the comparator is smaller than that of the forward input end IN & lt+ & gt, the output end of the comparator outputs a high level, the relay is IN a suction state, the pin 2 and the pin 3 of the relay are disconnected, the pin 4 and the pin 3 are connected, the first power supply is disconnected from a load, and the second power supply is connected with the load.
Compared with the prior art, the invention has the beneficial effects that:
(1) The scheme of the invention has simple architecture, realizes logic control without depending on software, and has stable circuit and easy realization;
(2) The scheme architecture of the invention carries out switching control of the power supply based on the switch with good transient response, can rapidly detect the power supply switching and prevent the voltage drop in the process of power supply switching;
(3) The scheme of the invention has the advantages that the capacitor voltage is stabilized in the power supply switching process, the voltage drop can be set in the required range, and meanwhile, two paths of power supplies cannot be conducted simultaneously, so that the risk of short circuit is avoided.
The invention is further described in connection with the following detailed description.
Drawings
Fig. 1 is a schematic diagram of a two-circuit power supply-based uninterruptible power switching load power supply system architecture according to the present invention.
Fig. 2 is a schematic circuit topology of embodiment 1 of the present invention.
Fig. 3 is a circuit topology diagram of embodiment 2 of the present invention.
Fig. 4 is a circuit topology diagram of embodiment 3 of the present invention.
Detailed Description
Referring to fig. 1, a switching LOAD POWER supply system without POWER outage based on two POWER supplies includes a first POWER supply POWER1, a second POWER supply POWER2, a LOAD, and a switch;
the first POWER supply POWER1 and the second POWER supply POWER2 are connected in parallel through a switch and are connected with a LOAD;
the first POWER supply POWER1 and the second POWER supply POWER2 supply POWER to the LOAD under the control of the switch.
Further, when the POWER supply of the POWER supply system is switched from the second POWER supply POWER2 to the first POWER supply POWER1, and the second POWER supply POWER2 is powered off, the detection end of the first POWER supply POWER1 will detect a POWER-off signal of the second POWER supply POWER2, so as to drive the switch of the first POWER supply POWER1 to be turned on and connected to the LOAD, and the switch of the second POWER supply POWER2 is turned off and the LOAD is turned off;
when the POWER supply of the POWER supply system is switched from the first POWER supply POWER1 to the second POWER supply POWER2, and the first POWER supply POWER1 is powered off, the detection end of the second POWER supply POWER2 detects the POWER-off signal of the first POWER supply POWER1, so that the switch of the second POWER supply POWER2 is driven to be turned on and connected to the LOAD, the switch of the first POWER supply POWER1 is turned off, and the LOAD is turned off.
Furthermore, the system also comprises a voltage stabilizing capacitor, and voltage is stabilized when the first POWER supply POWER1 and the second POWER supply POWER2 are used for switching POWER supply, so that voltage drop is prevented.
In the scheme, the power supply is switched by adopting the switch with the corresponding good transient state without power failure, so that the switching of the power supply can be responded quickly, and the voltage drop is prevented.
The system of the present invention is described in further detail below using three examples.
Example 1: in the embodiment 1, the MOS tube and the diode are used as the switch, the circuit architecture of the scheme is simple, the MOS tube can realize quick response, and the architecture is suitable for circuits needing quick response, such as office computers for electricity.
Referring to fig. 2, the uninterruptible power switching load power supply system based on two paths of power supplies in the present embodiment further includes a first resistor R1, and the switch includes a first MOS transistor Q1 and a first diode D1;
the first POWER supply POWER1 is connected with the drain electrode of the first MOS tube Q1, the grid electrode of the first MOS tube Q1 is respectively connected with the first resistor R1 and the second POWER supply POWER2, and the other end of the first resistor R1 is grounded;
the second POWER supply POWER2 is connected with the positive electrode of the first diode D1, and the negative electrode of the first diode D1 is connected with the source electrode of the first MOS transistor Q1 and the LOAD.
Further, when the POWER supply of the POWER supply system is switched from the second POWER supply POWER2 to the first POWER supply POWER1, the second POWER supply POWER2 is powered off, the drain electrode of the first MOS transistor Q1 detects a low level from a previous high level, the first MOS transistor Q1 is turned on, the first POWER supply POWER1 is connected to the LOAD in a conducting manner, and meanwhile, the first POWER supply POWER1 cannot flow to the second POWER supply POWER2 through the first diode D1;
when the POWER supply of the POWER supply system is switched from the first POWER supply POWER1 to the second POWER supply POWER2, the first POWER supply POWER1 is powered off, the drain electrode of the first MOS transistor Q1 detects a high level from a previous low level, the first MOS transistor Q1 is closed, the first POWER supply POWER1 is disconnected from the LOAD, and the second POWER supply POWER2 is connected with the LOAD through the first diode D1.
Meanwhile, the system in the embodiment further comprises voltage stabilizing capacitors C4 and C5, which are used for stabilizing voltage in the power supply switching process and preventing voltage drop.
Example 2: in this embodiment, two MOS transistors are used as switches, and two comparators are used at the same time, and after the reference voltage is set, the comparator can accurately detect the change of the supply voltage to realize the switching of two POWER.
Referring to fig. 3, the uninterruptible power switching load power supply system based on two paths of power supply in the embodiment further includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a comparator U1; the switch comprises a first MOS tube Q1 and a second MOS tube Q2;
the first POWER supply POWER1 is connected with the drain electrode of the first MOS tube Q1, the grid electrode of the first MOS tube Q1 is respectively connected with the first resistor R1, the second resistor R2 and the second output end of the comparator U1, the other end of the first resistor R1 is connected with VCC voltage, and the other end of the second resistor R2 is grounded; the drain electrode of the first MOS tube Q1 is connected with a LOAD LOAD;
the source electrode of the second MOS tube Q2 is connected with a second POWER supply POWER2, the grid electrode of the second MOS tube Q2 is connected with a third resistor R3 and the first output end of the comparator U1, and the other end of the third resistor R3 is connected with VCC voltage; the drain electrode of the second MOS tube Q2 is connected with a LOAD LOAD;
the first input terminal of the comparator U1 is connected to the second POWER supply POWER2, and the second input terminal of the comparator U1 is connected to the reference voltage vref_dac through the fourth resistor R4.
Further, when the POWER supply of the POWER supply system is switched from the second POWER supply POWER2 to the first POWER supply POWER1, the second POWER supply POWER2 is powered off, and at this time, the voltage of the first input end of the comparator U1 is smaller than the voltage of the second input end of the comparator U1, the first output end of the comparator U1 outputs a high level, and the second output end of the comparator U1 outputs a low level; the drain electrode of the first MOS tube Q1 detects the low level of the second output end of the comparator U1, the drain electrode of the second MOS tube Q2 detects the high level output by the first output end of the comparator U1, so that the first MOS tube Q1 is driven to be opened and conducted, the first POWER supply POWER1 is connected to a LOAD LOAD, the second MOS tube Q2 is closed, and the second POWER supply POWER2 is disconnected from the LOAD LOAD;
when the POWER supply of the POWER supply system is switched from a first POWER supply POWER1 to a second POWER supply POWER2, the first POWER supply POWER1 is powered off, at this time, the voltage of the first input end of the comparator U1 is greater than the voltage of the second input end of the comparator U1, the first output end of the comparator U1 outputs a low level, and the second output end of the comparator U1 outputs a high level; the drain electrode of the first MOS tube Q1 detects the high level output by the second output end of the comparator U1, the drain electrode of the second MOS tube Q2 detects the low level output by the first output end of the comparator U1, so that the first MOS tube Q1 is driven to be closed, the first POWER supply POWER1 is disconnected from the LOAD LOAD, the second MOS tube Q2 is opened, and the second POWER supply POWER2 is connected with the LOAD LOAD.
The embodiment also comprises voltage stabilizing capacitors C3 and C4 for stabilizing voltage in the process of switching power supply to prevent voltage drop
Example 3: in this embodiment, a relay is used as a switch, and a comparator is used at the same time, and after the reference voltage is set, the comparator can accurately detect the change of the POWER supply voltage to realize the switching of two POWER, and can realize the work of a large load.
Referring to fig. 4, the uninterruptible power switching load power supply system based on two paths of power supplies in the embodiment further includes a first resistor R1, a second resistor R2, a relay rliy 1, and a comparator U1, where the switch is a first diode D1;
the first POWER supply POWER1 and the second POWER supply are respectively connected with the pin 2 and the pin 4 of the relay RLY1, and the pin 3 of the relay RLY1 is connected with the LOAD LOAD;
the reverse input end IN-and the forward input end IN+ of the comparator U1 are respectively connected with a second power supply and a reference voltage VREF_DAC, and the output end of the comparator U1 is respectively connected with a first resistor R1, a pin 5 of a relay RLY1 and the cathode of a first diode D1; the other end of the first resistor R1 is connected with VCC voltage;
the anode of the first diode D1 is grounded, and the 1 pin of the relay rliy 1 is grounded.
Further, when the POWER supply of the POWER supply system is switched from the first POWER supply POWER1 to the second POWER supply POWER2, the first POWER supply POWER1 is powered off, the voltage of the reverse input end IN-of the comparator U1 is greater than the voltage of the forward input end in+, at this time, the output end of the comparator U1 outputs a low level, the relay rliy 1 is turned off IN the on state, the pins 2 and 3 of the relay rliy 1 are turned on, the pins 4 and 3 are turned off, the first POWER supply POWER1 is connected with the LOAD, and the second POWER supply POWER2 is disconnected with the LOAD;
when the POWER supply of the POWER supply system is switched from the second POWER supply POWER2 to the first POWER supply POWER1, the second POWER supply POWER2 is powered off, the voltage of the reverse input end IN-of the comparator U1 is smaller than that of the forward input end in+.
The embodiment also comprises voltage stabilizing capacitors C1 and C2 for stabilizing voltage in the process of switching power supply to prevent voltage drop
The foregoing embodiments illustrate and describe the basic principles, principal features of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (9)
1. The uninterrupted switching LOAD POWER supply system based on the two paths of POWER supplies is characterized by comprising a first POWER supply (POWER 1), a second POWER supply (POWER 2), a LOAD (LOAD) and a switch;
the first POWER supply (POWER 1) and the second POWER supply (POWER 2) are connected in parallel through a switch and are connected with a LOAD (LOAD);
the first POWER supply (POWER 1) and the second POWER supply (POWER 2) supply POWER to a LOAD (LOAD) under the control of a switch.
2. The uninterruptible POWER switching LOAD POWER supply system based on two POWER supplies according to claim 1, wherein when the POWER supply of the POWER supply system is switched from the second POWER supply (POWER 2) to the first POWER supply (POWER 1), and the second POWER supply (POWER 2) is powered off, the detection end of the first POWER supply (POWER 1) will detect a POWER-off signal of the second POWER supply (POWER 2), so as to drive the switch of the first POWER supply (POWER 1) to be turned on and connected to the LOAD (LOAD), the switch of the second POWER supply (POWER 2) is turned off, and the LOAD (LOAD) is turned off;
when the POWER supply source of the POWER supply system is switched from the first POWER source (POWER 1) to the second POWER source (POWER 2), and the first POWER source (POWER 1) is powered off, the detection end of the second POWER source (POWER 2) detects the POWER-off signal of the first POWER source (POWER 1), so that the switch of the second POWER source (POWER 2) is driven to be turned on and connected to the LOAD (LOAD), the switch of the first POWER source (POWER 1) is turned off, and the LOAD (LOAD) is turned off.
3. The uninterruptible POWER switching load POWER supply system based on two POWER supplies according to claim 2, further comprising a voltage stabilizing capacitor for stabilizing voltage when the first POWER supply (POWER 1) and the second POWER supply (POWER 2) switch POWER supply, and preventing voltage drop.
4. The uninterruptible switching load supply system based on two-way power supply according to claim 2, characterized in that the system further comprises a first resistor (R1), the switch comprising a first MOS transistor (Q1) and a first diode (D1);
the first POWER supply (POWER 1) is connected with the drain electrode of the first MOS tube (Q1), the grid electrode of the first MOS tube (Q1) is respectively connected with the first resistor (R1) and the second POWER supply (POWER 2), and the other end of the first resistor (R1) is grounded;
the second POWER supply (POWER 2) is connected with the positive electrode of the first diode (D1), and the negative electrode of the first diode (D1) is connected with the source electrode of the first MOS tube (Q1) and the LOAD (LOAD).
5. The two-POWER-supply-based uninterruptible switching LOAD POWER supply system according to claim 4, wherein when the POWER supply of the POWER supply system is switched from the second POWER supply (POWER 2) to the first POWER supply (POWER 1), the second POWER supply (POWER 2) is powered off, the drain of the first MOS transistor (Q1) detects a low level from a previous high level, the first MOS transistor (Q1) is turned on, the first POWER supply (POWER 1) is connected to the LOAD (LOAD) in an on state, and the first POWER supply (POWER 1) cannot flow to the second POWER supply (POWER 2) through the first diode (D1);
when the POWER supply of the POWER supply system is switched from a first POWER supply (POWER 1) to a second POWER supply (POWER 2), the first POWER supply (POWER 1) is powered off, the drain electrode of the first MOS tube (Q1) detects a high level from a previous low level, the first MOS tube (Q1) is closed, the first POWER supply (POWER 1) is disconnected from the LOAD (LOAD), and the second POWER supply (POWER 2) is connected with the LOAD (LOAD) through the first diode (D1).
6. The uninterruptible switching load power supply system based on two-way power supply according to claim 2, characterized in that the system further comprises a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a comparator (U1); the switch comprises a first MOS tube (Q1) and a second MOS tube (Q2);
the first POWER supply (POWER 1) is connected with the drain electrode of the first MOS tube (Q1), the grid electrode of the first MOS tube (Q1) is respectively connected with the first resistor (R1), the second resistor (R2) and the second output end of the comparator (U1), the other end of the first resistor (R1) is connected with VCC voltage, and the other end of the second resistor (R2) is grounded; the drain electrode of the first MOS tube (Q1) is connected with a LOAD (LOAD);
the source electrode of the second MOS tube (Q2) is connected with a second POWER supply (POWER 2), the grid electrode of the second MOS tube (Q2) is connected with a third resistor (R3) and the first output end of the comparator (U1), and the other end of the third resistor (R3) is connected with VCC voltage; the drain electrode of the second MOS tube (Q2) is connected with a LOAD (LOAD);
the first input end of the comparator (U1) is connected with the second POWER supply (POWER 2), and the second input end of the comparator (U1) is connected with the reference voltage VREF_DAC through a fourth resistor (R4).
7. The two-POWER-supply-based uninterruptible switching load POWER supply system according to claim 6, wherein when the POWER supply of the POWER supply system is switched from the second POWER supply (POWER 2) to the first POWER supply (POWER 1), the second POWER supply (POWER 2) is powered off, and the voltage of the first input terminal of the comparator (U1) is smaller than the voltage of the second input terminal of the comparator (U1), the first output terminal of the comparator (U1) outputs a high level, and the second output terminal of the comparator (U1) outputs a low level; the drain electrode of the first MOS tube (Q1) detects the low level of the second output end of the comparator (U1), the drain electrode of the second MOS tube (Q2) detects the high level output by the first output end of the comparator (U1), so that the first MOS tube (Q1) is driven to be opened and turned on, the first POWER supply (POWER 1) is connected to a LOAD (LOAD), the second MOS tube (Q2) is closed, and the second POWER supply (POWER 2) is disconnected from the LOAD (LOAD);
when the POWER supply of the POWER supply system is switched from a first POWER supply (POWER 1) to a second POWER supply (POWER 2), the first POWER supply (POWER 1) is powered off, and at the moment, the voltage of the first input end of the comparator (U1) is larger than the voltage of the second input end of the comparator (U1), the first output end of the comparator (U1) outputs a low level, and the second output end of the comparator (U1) outputs a high level; the drain electrode of the first MOS tube (Q1) detects the high level output by the second output end of the comparator (U1), the drain electrode of the second MOS tube (Q2) detects the low level output by the first output end of the comparator (U1), so that the first MOS tube (Q1) is driven to be closed, the first POWER supply (POWER 1) is disconnected with a LOAD (LOAD), the second MOS tube (Q2) is opened, and the second POWER supply (POWER 2) is connected with the LOAD (LOAD).
8. The uninterruptible switching load power supply system based on two-way power supply according to claim 2, characterized in that the system further comprises a first resistor (R1), a second resistor (R2), a relay (rli 1), a comparator (U1), the switch being a first diode (D1);
the first POWER supply (POWER 1) and the second POWER supply are respectively connected with a pin 2 and a pin 4 of the relay (RLY 1), and a pin 3 of the relay (RLY 1) is connected with a LOAD (LOAD);
the reverse input end (IN-) and the forward input end (IN+) of the comparator (U1) are respectively connected with the second power supply and the reference voltage VREF_DAC, and the output end of the comparator (U1) is respectively connected with the first resistor (R1), the pin 5 of the relay (RLY 1) and the cathode of the first diode (D1); the other end of the first resistor (R1) is connected with VCC voltage;
the anode of the first diode (D1) is grounded, and the 1 pin of the relay (RLY 1) is grounded.
9. The uninterruptible POWER switching LOAD POWER supply system based on two POWER supplies according to claim 8, wherein when the POWER supply of the POWER supply system is switched from a first POWER supply (POWER 1) to a second POWER supply (POWER 2), the first POWER supply (POWER 1) is powered off, the voltage of the reverse input terminal (IN-) of the comparator (U1) is greater than the voltage of the forward input terminal (in+), the output terminal of the comparator (U1) outputs a low level, the relay (RLY 1) is turned off IN a suction state, the pins 2 and 3 of the relay (RLY 1) are turned on, the pins 4 and 3 are turned off, the first POWER supply (POWER 1) is connected to the LOAD (LOAD), and the second POWER supply (POWER 2) is disconnected from the LOAD (LOAD);
when the POWER supply of the POWER supply system is switched from the second POWER supply (POWER 2) to the first POWER supply (POWER 1), the second POWER supply (POWER 2) is powered off, the voltage of the reverse input end (IN-) of the comparator (U1) is smaller than the voltage of the forward input end (in+), at the moment, the output end of the comparator (U1) outputs a high level, the relay (RLY 1) is IN a suction state, the pins 2 and 3 of the relay (RLY 1) are disconnected, the pins 4 and 3 are connected, the first POWER supply (POWER 1) is disconnected with the LOAD (LOAD), and the second POWER supply (POWER 2) is connected with the LOAD (LOAD).
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| CN202410065726.7A CN117578699A (en) | 2024-01-17 | 2024-01-17 | Uninterrupted switching load power supply system based on two paths of power supplies |
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| CN202410065726.7A CN117578699A (en) | 2024-01-17 | 2024-01-17 | Uninterrupted switching load power supply system based on two paths of power supplies |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425599A (en) * | 2017-09-13 | 2017-12-01 | 重庆大及电子科技有限公司 | Surge protection circuit for power compensator |
| CN112467862A (en) * | 2019-09-06 | 2021-03-09 | 北汽福田汽车股份有限公司 | Power supply switching device and system |
| CN116545092A (en) * | 2022-12-30 | 2023-08-04 | 中国建设银行股份有限公司北京市分行 | Control method, system, device, equipment and storage medium for load power supply |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425599A (en) * | 2017-09-13 | 2017-12-01 | 重庆大及电子科技有限公司 | Surge protection circuit for power compensator |
| CN112467862A (en) * | 2019-09-06 | 2021-03-09 | 北汽福田汽车股份有限公司 | Power supply switching device and system |
| CN116545092A (en) * | 2022-12-30 | 2023-08-04 | 中国建设银行股份有限公司北京市分行 | Control method, system, device, equipment and storage medium for load power supply |
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