CN111884324A - Power supply switching system - Google Patents
Power supply switching system Download PDFInfo
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- CN111884324A CN111884324A CN202010777240.8A CN202010777240A CN111884324A CN 111884324 A CN111884324 A CN 111884324A CN 202010777240 A CN202010777240 A CN 202010777240A CN 111884324 A CN111884324 A CN 111884324A
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- voltage
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- switch
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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
- H02J9/061—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 for DC powered loads
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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 power supply switching system, which collects the output voltage of a power supply through a voltage collection and conversion circuit, outputs the output voltage of the power supply to a power supply detection circuit to detect whether the output voltage is greater than a preset reference voltage, and controls a switching circuit to output a first control signal when the output voltage of the power supply is greater than the preset reference voltage; when the input voltage of the power supply is less than or equal to the preset reference voltage, a second control signal is output, the switch controls the load to be connected with a second output end of the voltage acquisition and conversion circuit or an external power supply according to the first control signal or the second control signal, power failure detection and automatic power supply switching are achieved through a pure hardware circuit, switching of the power supply is not required to be controlled by a controller, and seamless connection of power supply switching is achieved.
Description
Technical Field
The invention relates to the technical field of power supply control, in particular to a power supply switching system.
Background
With the continuous progress of scientific technology, the application field of the UPS is also wider and wider, and a plurality of industrial devices are also applied to the UPS, but the existing UPS power supply switching control takes a single chip microcomputer controller as a core, external switching conditions are collected through a detection circuit, and the single chip microcomputer controller is used for controlling a switch device with an electric operating mechanism, so that the switching control among different power supplies in the system is automatically realized, the seamless connection of power supply switching is difficult to realize, the response rate of the controller and the sampling time sequence requirement of a sampling circuit are very high, the design cost is increased, and the circuit is complex, so that the stability and the reliability of the power supply switching system are lower.
Disclosure of Invention
The invention aims to provide a power supply switching system, which solves the problem that seamless connection of power supply switching is difficult to realize in a mode of controlling power supply switching through a controller.
In one embodiment, a power switching system is provided, comprising:
the voltage acquisition and conversion circuit is used for acquiring the output voltage of the power supply, outputting the output voltage of the power supply through a first output end of the voltage acquisition and conversion circuit, converting the output voltage of the power supply into a second preset voltage, and outputting the second preset voltage to a load through a second output end of the voltage acquisition and conversion circuit;
the power supply detection circuit is used for detecting whether the output voltage of the power supply is greater than a preset reference voltage or not, and the preset reference voltage is provided by a preset reference voltage source;
the control switching circuit is used for outputting a first control signal when the output voltage of the power supply is greater than a preset reference voltage; when the input voltage of the power supply is less than or equal to a preset reference voltage, outputting a second control signal;
and the change-over switch is used for controlling the load to be connected with the second output end of the voltage acquisition and conversion circuit or the external power supply according to the first control signal or the second control signal.
Further, power detection circuitry includes comparator and partial pressure module, the first input end of comparator is connected and is predetermine reference voltage source, the partial pressure module is connected between the first output of voltage acquisition converting circuit and the predetermined zero line, just the partial pressure node of partial pressure module with the second input end of comparator is connected, the partial pressure module is used for forming different partial pressures to the output voltage of power to with the partial pressure input to the second input of comparator, the comparator is according to the partial pressure of partial pressure module input and the big or small relation of predetermineeing reference voltage of predetermineeing the reference voltage source input, output high level signal or low level signal.
Further, the voltage division module comprises a first resistor and a second resistor, the first resistor is connected between a second input end of the comparator and a first output end of the voltage acquisition and conversion circuit, one end of the second resistor is connected with a second input end of the comparator, the other end of the second resistor is connected with a preset zero line, and an output end of the comparator is connected with an output end of the power supply detection circuit.
Further, the control switching circuit comprises a photoelectric coupler, a first switch and a second switch;
the first input end of the photoelectric coupler is used for receiving a first preset voltage, the second input end of the photoelectric coupler is connected with the output end of the power supply detection circuit, the first output end of the photoelectric coupler is connected with a second preset voltage source, the second output end of the photoelectric coupler is connected with the control electrode of the first switch and is grounded through a ninth resistor and a sixth capacitor, the first pole of the first switch is connected with the positive pole of an external power supply, and the second pole of the first switch is connected with the second output end of the photoelectric coupler through a third resistor; the first pole of the first switch is also connected with the control pole of the second switch, the first pole of the second switch is connected with the output end of the control switching circuit, and the second pole of the second switch is grounded.
Further, a control switch is included that is connected between the second pole of the second switch and ground.
Further, the voltage acquisition and conversion circuit comprises:
the input end of the rectification module is connected with the power supply and is used for rectifying alternating-current voltage output by the power supply into direct-current voltage, and the output end of the rectification module is connected with the first output end of the voltage acquisition and conversion circuit;
the filter capacitor is connected in parallel with the output end of the rectifying module and is used for filtering the direct-current voltage output by the rectifying module;
and the voltage conversion module is connected between the filter capacitor and the load and used for converting the direct-current voltage filtered by the filter capacitor into a second preset voltage and outputting the second preset voltage to the load through a second output end of the voltage acquisition and conversion circuit.
Further, the second end of the switch is connected with the output end of the voltage conversion module.
Further, the voltage conversion module is further configured to convert the dc voltage filtered by the filter capacitor into a first preset voltage;
the preset reference voltage source is used for converting a first preset voltage into a preset reference voltage.
Furthermore, the preset reference voltage source comprises a twelfth resistor, a sixth capacitor and a voltage divider, one end of the twelfth resistor is connected with the first preset voltage, the other end of the twelfth resistor is connected with the anode of the voltage divider, the cathode of the voltage divider is grounded, the voltage dividing end of the voltage divider is the output end of the preset reference voltage source and is used for outputting the preset reference voltage, and the sixth capacitor is connected between the anode and the cathode of the voltage divider.
Further, the external power supply is a UPS power supply, and the change-over switch is a relay.
According to the power supply switching system of the embodiment, the voltage acquisition and conversion circuit acquires the output voltage of the power supply, the output voltage of the power supply is output to the power supply detection circuit to detect whether the output voltage is greater than the preset reference voltage, and the switching circuit is controlled to output the first control signal when the output voltage of the power supply is greater than the preset reference voltage; when the input voltage of the power supply is less than or equal to the preset reference voltage, a second control signal is output, the switch controls the load to be connected with a second output end of the voltage acquisition and conversion circuit or an external power supply according to the first control signal or the second control signal, power failure detection and automatic power supply switching are achieved through a pure hardware circuit, switching of the power supply is not required to be controlled by a controller, and seamless connection of power supply switching is achieved.
Drawings
FIG. 1 is a block diagram of a power switching system according to an embodiment;
FIG. 2 is a circuit diagram of a voltage acquisition converter circuit and a diverter switch according to one embodiment;
FIG. 3 is a circuit diagram of a power detection circuit and a control switching circuit of an embodiment;
FIG. 4 is a circuit diagram of an embodiment of a default power supply.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Referring to fig. 1, fig. 1 is a block diagram of a power switching system according to an embodiment, where the power switching system includes a power supply 10, a voltage acquisition and conversion circuit 20, a power detection circuit 30, a control switching circuit 40, a switch 50, a load 60, and an external power supply 70.
Wherein: the voltage acquisition and conversion circuit 20 is connected between the power source 10 and the load 60, and is configured to acquire an output voltage of the power source 10, output the output voltage of the power source through a first output terminal of the voltage acquisition and conversion circuit 20, convert the output voltage of the power source 10 into a second preset voltage, and output the second preset voltage to the load 60 through a second output terminal of the voltage acquisition and conversion circuit 20.
The input end of the power detection circuit 30 is connected to the first output end of the voltage acquisition and conversion circuit 20 and the preset reference voltage source, and is configured to detect whether the output voltage of the power supply 10 is greater than the preset reference voltage.
The input end of the control switching circuit 40 is connected to the output end of the power detection circuit 30, and is configured to output a first control signal when the output voltage of the power supply 10 is greater than a preset reference voltage; and outputting a second control signal when the input voltage of the power supply 10 is less than or equal to the preset reference voltage.
The first end of the switch 50 is connected to the load 60, the second end is connected to the second output end of the voltage acquisition and conversion circuit 20, the third end is connected to the external power source 70, and the control end is connected to the output end of the control switching circuit 40, so as to control the load 60 to be connected to the second output end of the voltage acquisition and conversion circuit 20 or the external power source 70 according to the first control signal or the second control signal.
In the embodiment of the present invention, when the magnitude of the output voltage of the power supply 10 is smaller than or equal to the preset reference voltage due to the abnormal condition of the power supply 10, it cannot provide sufficient and stable load voltage for the load 60 any more, at this time, the switching circuit 40 is controlled to output the second control signal, and the second control signal controls the switch 50 to switch so that the external power supply 70 is connected to the power supply end of the load 60, that is, the external power supply 70 is switched to the voltage required by the load 60 as the load power supply to provide the load; it should be noted that, in an initial condition, the load 60 connected to the first end of the switch 50 and the second output end of the voltage acquisition and conversion circuit 20 connected to the second end of the switch 50 are connected by default, so when the power supply 10 works normally, the output voltage of the power supply 10 is preset to be a reference voltage, which can provide the load voltage required by the load 60 for the load, at this time, the switch 40 is controlled to output the first control signal, at this time, the switch 50 does not need to be switched in the initial condition, the power supply 10 provides the required voltage for the load 60, if the first end of the switch 50 is connected to the third end at this time, that is, the external power supply 70 supplies power to the load, under the control of the first control signal, the switch 50 is switched, so that the first end is connected to the second end, that is, that the power supply 10 supplies power to the load 60.
Referring to fig. 2, fig. 2 is a circuit diagram of a voltage acquisition conversion circuit and a switch according to an embodiment, in which a power supply 10 in the embodiment is connected to an input terminal of a voltage acquisition conversion circuit 20 through a first interface J1, and a load 60 is connected to a first terminal of a switch 50 through a second interface J2.
In one embodiment, the voltage acquisition and conversion circuit 20 includes: a rectifying module, a filter capacitor C1 and a voltage conversion module. Wherein: the input end of the rectification module is connected with the power supply and used for rectifying alternating-current voltage output by the power supply into direct-current voltage, and the output end of the rectification module and the first output end of the voltage acquisition and conversion circuit are connected with a filter capacitor in parallel and connected with the output end of the rectification module and used for filtering the direct-current voltage output by the rectification module; the voltage conversion module is connected between the filter capacitor and the load and used for converting the direct-current voltage filtered by the filter capacitor into a second preset voltage and outputting the second preset voltage to the load through a second output end of the voltage acquisition and conversion circuit.
The rectifying module in this embodiment comprises a current limiter F1, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6, wherein a positive input end of the first interface J1 is connected to a cathode of the third diode D3 and an anode of the fourth diode D4 through the current limiter F1, a negative input end of the first interface J1 is connected to an anode of the first diode D1 and a cathode of the second diode D2, a cathode of the first diode D1 is connected to a cathode of the fourth diode D4 and to one end of a filter capacitor C1, an anode of the second diode D2 is connected to an anode of the third diode D3 and to the other end of the preset zero line and the filter capacitor C1, a cathode of the third diode D3 and an anode of the fourth diode D4 are further connected to an anode of the fifth diode D5, an anode of the first diode D1 and an anode of the second diode D6 are further connected to the first diode D2, the cathode of the fifth diode D5 is connected to the cathode of the sixth diode D6, and the connection point of the cathode of the fifth diode D5 and the cathode of the sixth diode D6 is the output end of the rectifier module, which is used for collecting the output voltage V + of the output power source 10. In addition, two ends of the filter capacitor C1 are respectively connected to the voltage input end and the zero line input end of the voltage conversion module, the voltage conversion module in this embodiment is an existing dc-dc voltage conversion chip, which can convert the voltage at two ends of the filter capacitor C1 into a second preset voltage, the second preset voltage is a power supply voltage required by a load, the second preset voltage is 24V in this embodiment, in addition, the ground wire at the input end of the voltage conversion module in this embodiment is connected to the preset zero line, and the ground wire at the output end is connected to the ground, so that the input and output electromagnetic isolation can be realized.
In one embodiment, the power detection circuit includes a comparator U2 and a voltage dividing module, the comparator U2 includes a first input terminal VIN1, a second input terminal VIN2 and an output terminal VO, the first input terminal VIN1 of the comparator U2 is connected to a preset reference voltage source, the preset reference voltage source is configured to provide a preset reference voltage 2.5V _ N, the voltage dividing module is connected between the first output terminal of the voltage acquisition and conversion circuit 20 and the preset zero line, and the voltage dividing node of the voltage dividing module is connected with the second input end VIN2 of the comparator U2, the voltage dividing module is used for forming different voltage divisions for the output voltage V + of the first output end of the voltage acquisition and conversion circuit 20, and the divided voltage is input to a second input terminal VIN2 of the comparator U2, and the comparator outputs a high level signal or a low level signal through the output terminal VO according to the magnitude relation between the divided voltage input by the voltage dividing module and a preset reference voltage input by a preset reference voltage source. For example, when the divided voltage inputted from the second input terminal VIN2 of the comparator U2 is less than or equal to the preset reference voltage inputted from the second input terminal VIN2, the output terminal VO outputs a high signal, otherwise, outputs a low signal.
The voltage division module in this embodiment includes a first resistor R1 and a second resistor R2, the first resistor R1 is connected between a second input terminal VIN2 of the comparator U2 and a first output terminal of the voltage acquisition and conversion circuit 20, one end of the second resistor R2 is connected to a second input terminal VIN2 of the comparator U2, the other end of the second resistor R2 is connected to a preset zero line, a voltage division node is a connection point of the first resistor R1 and the second resistor R2, and an output terminal VO of the comparator U2 is connected to an output terminal of the power detection circuit 30. The divided voltage in this embodiment is
Referring to fig. 3, fig. 3 is a circuit diagram of a power detection circuit and a control switching circuit according to an embodiment, the power detection circuit 30 further includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a zener diode D10, a second capacitor C2, and a third capacitor C3, wherein a predetermined voltage source is connected to a first input terminal VIN1 of a comparator U2 through a third resistor R3, a first input terminal of the voltage acquisition and conversion circuit 20 is connected to a cathode of the zener diode D10 through a first resistor R1, a cathode of the zener diode D10 is further connected to a second input terminal VIN2 of a comparator U2, an anode of the zener diode D2 is connected to a predetermined neutral line, the second capacitor and the second resistor are both connected in parallel to both ends of the zener diode D2, the comparator U2 further includes a power line and a neutral line, the power line is used for receiving a first predetermined voltage wkp, a ground line is connected to a predetermined neutral line, and one end of the third capacitor 3 is used for receiving a predetermined voltage wwr, the other end of the resistor is connected with a preset zero line, a fourth resistor R4 is connected between a first input end VIN1 and an output end VO, and a fifth resistor R5 is connected in parallel at two ends of the fourth resistor R4. The ground wires of the power detection circuit 30 provided in this embodiment are all the preset zero lines, and are electromagnetically isolated from the control switching circuit at the next stage.
In one embodiment, the control switching circuit 40 includes a photocoupler U3, a first switch O1, a second switch Q2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor, wherein the photocoupler U3 includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal, the first input terminal of the photocoupler U3 is connected to the output terminal VO of the fifth resistor R5 and the comparator U2 through the sixth resistor R6, the fourth capacitor is connected in parallel to both ends of the sixth resistor R6, the first input terminal of the photocoupler U3 further receives a first preset voltage WKPWR through the seventh resistor R7, the second input terminal of the photocoupler U3 is connected to the output terminal of the comparator U2, the eighth resistor R3 of the photocoupler U3 is connected to the external power supply through the eighth resistor R8, a second output terminal of the photocoupler U3 is connected to a control electrode of the first switch Q1, a fifth capacitor C5 is connected between the first output terminal and the second output terminal of the photocoupler U3, a first electrode of the first switch Q1 is connected to an anode of the external power supply through a tenth resistor R10, a first electrode of the first switch Q1 is further connected to a control electrode of the second switch Q2, a ninth resistor R9 is connected between the control electrode and the second electrode of the first switch Q1, a second electrode of the first switch Q1 is further grounded through a sixth capacitor, a second electrode of the second switch Q2 is connected to the second electrode of the first switch Q1, an eleventh resistor R11 is connected between the control electrode and the second electrode of the second switch Q2, the second electrode of the second switch Q2 is grounded, and a first electrode of the second switch Q2 is connected to an output terminal RLY of the control switching circuit 40, and is configured to output the first control signal or the second control signal.
For example, when the divided voltage input from the second input terminal VIN2 of the comparator U2 is less than or equal to the preset reference voltage input from the second input terminal VIN2, the output terminal VO outputs a high level signal, the photocoupler U3 is not turned on, the second output terminal of the photocoupler U3 is at a low level, the control electrode of the first switch Q1 is also at a low level, the first switch Q1 is turned off, the first electrode of the first switch Q1 is at a high level, the control electrode of the second switch Q2 is at a high level, the second switch Q2 is turned on, the second electrode of the second switch Q2 is connected to ground, the output terminal UPS _ RLY of the switching circuit 40 is further controlled to be connected to ground, and at this time, the output terminal of the switching circuit 40 is controlled to output a low level signal, that is, i.e., the second control signal is a low; on the contrary, when the divided voltage input by the second input terminal VIN2 of the comparator U2 is greater than the preset reference voltage input by the second input terminal VIN2, the electric coupler U3 is turned on, the second output terminal of the photoelectric coupler U3 is at a high level, the control terminal of the first switch Q1 is also at a high level, the first switch Q1 is turned on, the first terminal of the first switch Q1 is at a low level, the control terminal of the second switch Q2 is at a low level, the second switch Q2 is turned off, the second terminal of the second switch Q2 is at a high level, the output terminal _ RLY of the switching circuit 40 is further controlled to be at a high level, and at this time, the output terminal of the switching circuit 40 is controlled to output a high level signal, that is, the first control signal is a high level signal.
In this embodiment, when
When the second control signal is output, when
Then, the first control signal is output.
The first switch Q1 and the second switch Q2 in this embodiment may be bipolar transistors, field effect transistors, or the like. For example, when the transistor is a bipolar transistor, the control electrode of the transistor refers to a base electrode of the bipolar transistor, the first electrode may be a collector or an emitter of the bipolar transistor, and the corresponding second electrode may be an emitter or a collector of the bipolar transistor; when the transistor is a field effect transistor, the control electrode refers to a gate electrode of the field effect transistor, the first electrode may be a drain electrode or a source electrode of the field effect transistor, and the corresponding second electrode may be a source electrode or a drain electrode of the field effect transistor.
The first preset voltage WKPWR in this embodiment may be obtained by a voltage conversion module in the voltage acquisition and conversion circuit 20, and the voltage conversion module is further configured to convert the dc voltage filtered by the filter capacitor into the first preset voltage WKPWR.
The preset reference voltage source in this embodiment is configured to convert the first preset voltage WKPWR into a preset reference voltage 2.5V _ N.
Referring to fig. 4, fig. 4 is a circuit diagram of an embodiment of a preset reference voltage source, the preset voltage source includes a twelfth resistor R12, a sixth capacitor C6 and a voltage divider U4, one end of the twelfth resistor R12 is used for receiving a first preset voltage WKPWR, the other end of the twelfth resistor R12 is connected to the positive electrode of the voltage divider U4, the negative electrode of the voltage divider U4 is grounded, the voltage dividing end of the voltage divider U4 is an output end of the preset reference voltage source and is used for outputting a preset reference voltage 2.5V _ N, and the sixth capacitor C6 is connected between the positive electrode and the negative electrode of the voltage divider U4. The voltage divider U4 in this embodiment is model AG 431.
In an embodiment, the switch 50 is a relay, as shown in fig. 2, the moving terminal of the relay RLY is a first terminal of the switch 50, which is connected to the load, the normally closed terminal of the relay RLY is a second terminal of the switch 50, which is connected to the second output terminal of the voltage acquisition and conversion circuit, the normally open terminal of the relay RLY is a third terminal of the switch 50, which is connected to the positive electrode of the external power source, and the control terminal of the relay RLY is connected to the output terminal of the control switch circuit. Outputting a second control signal (a high level signal) at the output end of the control switching circuit, and switching the movable end of the relay RLY from the normally closed end to the normally open end so that the load is connected with an external power supply; and a first control signal (a low level signal) is output at the output end of the control switching circuit, and the movable end of the relay RLY is switched from the normally-open end to the normally-closed end, so that the load is connected with the second output end of the voltage acquisition and conversion circuit.
The embodiment further includes a seventh diode D7, an eighth diode D8, and a ninth diode D9, an anode of the seventh diode D7 is connected to the anode output terminal of the voltage conversion module, a cathode of the seventh diode D7 is connected to the anode of the second interface J2, a cathode output terminal of the voltage conversion module is connected to the cathode of the second interface J2 and the cathode of the external power source, an anode of the eighth diode D8 is connected to the output terminal of the control switching circuit, a cathode of the eighth diode D8 is connected to the anode of the external power source, an anode of the ninth diode 9 is connected to the anode of the eighth diode D8, and a cathode of the ninth diode D9 is connected to the cathode of the eighth diode D8.
In one embodiment, the external power source is a UPS power source.
In an embodiment, the power supply further includes a control switch K1, connected between the second pole of the second switch Q2 and ground, for controlling whether the external power supply is needed to be connected when the power supply detection circuit detects that the power supply is powered down, that is, the output voltage of the power supply is less than the preset reference voltage, and the control chip can control the external power supply to be connected, so that the external power supply can be automatically cut off through the control switch K1 after the external power supply is switched on and works for a period of time.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A power switching system, comprising:
the voltage acquisition and conversion circuit is used for acquiring the output voltage of the power supply, outputting the output voltage of the power supply through a first output end of the voltage acquisition and conversion circuit, converting the output voltage of the power supply into a second preset voltage, and outputting the second preset voltage to a load through a second output end of the voltage acquisition and conversion circuit;
the power supply detection circuit is used for detecting whether the output voltage of the power supply is greater than a preset reference voltage or not, and the preset reference voltage is provided by a preset reference voltage source;
the control switching circuit is used for outputting a first control signal when the output voltage of the power supply is greater than a preset reference voltage; when the input voltage of the power supply is less than or equal to a preset reference voltage, outputting a second control signal;
and the change-over switch is used for controlling the load to be connected with the second output end of the voltage acquisition and conversion circuit or the external power supply according to the first control signal or the second control signal.
2. The power switching system according to claim 1, wherein the power detecting circuit includes a comparator and a voltage dividing module, a first input terminal of the comparator is connected to a preset reference voltage source, the voltage dividing module is connected between a first output terminal of the voltage collecting and converting circuit and a preset zero line, a voltage dividing node of the voltage dividing module is connected to a second input terminal of the comparator, the voltage dividing module is configured to form different divided voltages for the output voltage of the power source and input the divided voltages to the second input terminal of the comparator, and the comparator outputs a high level signal or a low level signal according to a magnitude relationship between the divided voltages input by the voltage dividing module and the preset reference voltage input by the preset reference voltage source.
3. The power switching system according to claim 2, wherein the voltage dividing module comprises a first resistor and a second resistor, the first resistor is connected between a second input terminal of a comparator and a first output terminal of the voltage acquisition and conversion circuit, one end of the second resistor is connected to the second input terminal of the comparator, the other end of the second resistor is connected to a preset zero line, and an output terminal of the comparator is connected to an output terminal of the power detection circuit.
4. The power switching system of claim 1, wherein the control switching circuit comprises a photo coupler, a first switch, and a second switch;
the first input end of the photoelectric coupler is used for receiving a first preset voltage, the second input end of the photoelectric coupler is connected with the output end of the power supply detection circuit, the first output end of the photoelectric coupler is connected with a second preset voltage source, the second output end of the photoelectric coupler is connected with the control electrode of the first switch and is grounded through a ninth resistor and a sixth capacitor, the first pole of the first switch is connected with the positive pole of an external power supply, and the second pole of the first switch is connected with the second output end of the photoelectric coupler through a third resistor; the first pole of the first switch is also connected with the control pole of the second switch, the first pole of the second switch is connected with the output end of the control switching circuit, and the second pole of the second switch is grounded.
5. The power switching system of claim 4, further comprising a control switch connected between the second pole of the second switch and ground.
6. The power switching system according to any one of claims 1 to 5, wherein the voltage acquisition conversion circuit comprises:
the input end of the rectification module is connected with the power supply and is used for rectifying alternating-current voltage output by the power supply into direct-current voltage, and the output end of the rectification module is connected with the first output end of the voltage acquisition and conversion circuit;
the filter capacitor is connected in parallel with the output end of the rectifying module and is used for filtering the direct-current voltage output by the rectifying module;
and the voltage conversion module is connected between the filter capacitor and the load and used for converting the direct-current voltage filtered by the filter capacitor into a second preset voltage and outputting the second preset voltage to the load through a second output end of the voltage acquisition and conversion circuit.
7. The power switching system of claim 6, wherein the second terminal of the switch is coupled to the output terminal of the voltage conversion module.
8. The power switching system according to claim 6, wherein the voltage converting module is further configured to convert the dc voltage filtered by the filter capacitor into a first preset voltage;
the preset reference voltage source is used for converting a first preset voltage into a preset reference voltage.
9. The power switching system of claim 8, wherein the predetermined reference voltage source comprises a twelfth resistor, a sixth capacitor and a voltage divider, one end of the twelfth resistor is connected to the first predetermined voltage, the other end of the twelfth resistor is connected to the positive electrode of the voltage divider, the negative electrode of the voltage divider is grounded, the voltage dividing end of the voltage divider is the output end of the predetermined reference voltage source for outputting the predetermined reference voltage, and the sixth capacitor is connected between the positive electrode and the negative electrode of the voltage divider.
10. The power switching system of claim 1, wherein the external power source is a UPS power source and the transfer switch is a relay.
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| CN202010777240.8A CN111884324A (en) | 2020-08-05 | 2020-08-05 | Power supply switching system |
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| CN202010777240.8A CN111884324A (en) | 2020-08-05 | 2020-08-05 | Power supply switching system |
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Application publication date: 20201103 |