CN117650023A

CN117650023A - Switching power supply and electronic equipment

Info

Publication number: CN117650023A
Application number: CN202311208522.6A
Authority: CN
Inventors: 焦海清; 童建利; 冯明奇
Original assignee: XFusion Digital Technologies Co Ltd
Current assignee: XFusion Digital Technologies Co Ltd
Priority date: 2023-09-18
Filing date: 2023-09-18
Publication date: 2024-03-05

Abstract

The embodiment of the application discloses switching power supply and electronic equipment adds a booster circuit in a relay control circuit to raise the voltage applied to two ends of an electromagnetic relay coil, so that the current passing through the coil is improved, the magnetic force is increased, the time of the armature attracting action of the relay is shortened, and the response speed of the electromagnetic relay is improved.

Description

Switching power supply and electronic equipment

Technical Field

The application relates to the technical field of circuits, in particular to a switching power supply and electronic equipment.

Background

The electromagnetic relay is an electrical component which is triggered by external conditions to connect or disconnect different circuits, thereby realizing control of electrical appliances. The method is widely applied to various fields such as industrial automation control, aerospace and ship electric control, instrument and meter control, automobile electronic control, intelligent home furnishing and the like. By adopting the relay, the switching state of the circuit can be effectively changed, so that the start and stop of various electrical equipment can be controlled.

As shown in fig. 1A, which is a schematic diagram of the principle of an electromagnetic relay, the electromagnetic relay is a mechanical component including a core 11, a coil 12 wound on the core, an armature 13, a normally closed contact (i.e., a contact 14), a normally open contact (i.e., a contact 15), and a common terminal 16. When a certain voltage is applied to both ends of the coil, a certain current flows through the coil 12, so that an electromagnetic effect is generated, and the armature 13 is attracted to the iron core 11 under the action of electromagnetic force attraction and is switched from a normally closed contact to a normally open contact. When the coil is de-energized, the electromagnetic attraction force is also lost, and the armature 13 is switched from a normally open contact to a normally closed contact. Thus, the electromagnetic relay is attracted and released, and the electromagnetic relay is switched on and off in a circuit.

As shown in fig. 1B, the principle schematic diagram of another electromagnetic relay is shown, and the electromagnetic relay is a magnetic latching relay, and the magnetic latching relay generally includes 2 coils (12 a, 12B), where the two coils (12 a, 12B) share the same iron core 11, the coils (12 a, 12B) are all wound on the iron core 11, and only one coil 12a needs to be energized to trigger the armature 13 to attract the two contacts (14 a, 14B), so that the two contacts can be maintained without continuous power supply after attraction, and when the position needs to be switched, short-time power supply needs to be performed on the other coil 12B again, so that the armature 13 attracts the other two contacts (15 a, 15B).

However, when the coil of the electromagnetic relay is energized, the action time for switching the armature of the electromagnetic relay from one contact to the other contact is relatively long, the response speed is relatively slow, and it is difficult to satisfy the scene that the response time is relatively high.

Disclosure of Invention

The embodiment of the application provides a switching power supply and electronic equipment, which are characterized in that a booster circuit is added in a relay control circuit of the switching power supply, so that the response speed of a relay can be improved.

In a first aspect, embodiments of the present application provide a switching power supply including a dc power supply, a relay, and a relay control circuit; the relay control circuit comprises a boost circuit, a first switching tube and a controller; the input end of the booster circuit is electrically connected with the first end of the direct-current power supply; the output end of the booster circuit is electrically connected with the first end of the first coil of the relay; the second end of the first coil is electrically connected with the first end of the first switching tube, and the second end of the first switching tube and the second end of the direct current power supply are grounded; the controller comprises a first output end and a second output end; the first output end of the controller is electrically connected with the control end of the boost circuit; the controller is used for generating a first control signal; the first output end is used for outputting a first control signal to the control end of the boost circuit; the first control signal is used for controlling the working state of the booster circuit; the working states comprise a boosting state and a voltage transmission state; the second output end of the controller is electrically connected with the control end of the first switching tube, and the controller is used for generating a second control signal; the second output end is used for outputting a second control signal to the control end of the first switching tube; the controller outputs a second control signal to the first switching tube through the second output end; the second control signal is used for controlling the on or off of the first switching tube.

In the embodiment, the booster circuit is added in the relay control circuit to boost the voltage applied to the two ends of the coil of the electromagnetic relay, so that the current passing through the coil is increased, the magnetic force is increased, the time of the armature attraction action of the relay is shortened, and the response speed of the electromagnetic relay is improved.

With reference to the first aspect, in one possible implementation manner, the controller is further configured to control the boost circuit to be in a boost state before the relay completes the actuation; or the controller is also used for controlling the booster circuit to be in a voltage transmission state after the relay completes the actuation.

According to the embodiment, before the relay completes the actuation, the booster circuit is controlled to be in the boosting state, so that the time consumption of boosting can be avoided when the relay needs to be actuated, and the actuation efficiency is improved.

Optionally, the voltage of the direct current power supply may be smaller than the rated voltage of the relay, and after the relay completes the actuation, the boost circuit is controlled to be in a voltage transmission state, so that the voltage of the direct current power supply maintains the actuation state of the relay, and energy consumption can be reduced.

With reference to the first aspect, in a possible implementation manner, the controller is further configured to control the output voltage of the boost circuit by controlling a duty cycle of the first control signal.

With reference to the first aspect, in a possible implementation manner, the controller is further configured to increase a duty cycle of the first control signal if it is determined that the voltage at the first end of the first coil is less than a preset voltage; or, in case that the voltage at the first end of the first coil is greater than the preset voltage, the duty ratio of the first control signal is reduced. During the operation of the booster circuit, the controller increases or decreases the output voltage of the booster circuit by increasing or decreasing the duty ratio of the first control signal, so that the voltage of the relay coil is maintained in a stable interval.

With reference to the first aspect, in one possible implementation manner, the boost circuit includes a first inductor, a second switching tube, a first diode, a second diode, and a first capacitor; the first end of the first inductor and the first end of the second diode are electrically connected with the first end of the direct current power supply; the second end of the first inductor, the first end of the second diode and the first end of the second switching tube are electrically connected; the second end of the first diode, the second end of the second diode and the first end of the first capacitor are electrically connected to the first end of the first coil; the second end of the first capacitor is grounded; the second end of the second switch tube is grounded; the first output end of the controller is electrically connected with the control end of the second switching tube.

With reference to the first aspect, in one possible implementation manner, the relay is a magnetic latching relay; the relay further comprises a second coil, the first coil is used for controlling the armature to be attracted to the first contact, and the second coil is used for controlling the armature to be attracted to the second contact; the relay control circuit also comprises a third switching tube; the second end of the first diode, the second end of the second diode and the first end of the first capacitor are electrically connected to the first end of the second coil; the first end of the third switching tube is electrically connected with the second end of the second coil, and the second end of the third switching tube is electrically connected with the second end of the direct current power supply; the controller further comprises a third output end, the third output end is electrically connected with the control end of the third switching tube, and the controller is further used for generating a third control signal, and the third control signal is used for controlling the on and off of the third switching tube; the controller controls the third switching tube to be conducted through a third control signal output by the third output end; the first switching tube and the third switching tube are not conducted at the same time.

With reference to the first aspect, in one possible implementation manner, the controller is further configured to control the first switching tube to be opened after the armature is attracted to the first contact, and/or to control the third switching tube to be opened after the armature is attracted to the second contact.

In the embodiment, the magnetic latching relay is used, and after the relay is attracted, the armature of the magnetic latching relay is kept attracted by the magnetic force of the armature, so that the energy consumption of a relay control circuit is reduced.

With reference to the first aspect, in one possible implementation manner, the switching power supply further includes a first power supply circuit and a second power supply circuit; the first power supply circuit and the second power supply circuit are standby power supply circuits; the output end of the first power supply circuit is electrically connected with the third end of the relay; the output end of the second power supply circuit is electrically connected with the fourth end of the relay; the first power supply circuit is used for supplying power to a load; the controller is also used for responding to the fault of the first power supply circuit and controlling the relay to switch the second power supply circuit to supply power to the load.

According to the embodiment, the rapid switching between the two power supply circuits is realized, and the power supply requirement under the scene of higher power supply requirement is met.

With reference to the first aspect, in a possible implementation manner, the switching power supply further includes a third power supply circuit; the input end of the third power supply circuit is electrically connected with the fifth end of the relay; the third power supply circuit is used for supplying power to the load; the controller also controls the relay to cut off the power supply of the third power supply circuit in response to the third power supply circuit failing.

The above embodiment cuts off the power supply circuit rapidly when the fault occurs, so as to protect life or property safety.

In a second aspect, an embodiment of the present application provides an electronic device, which includes the switching power supply in the first aspect or any one of the possible implementation manners of the first aspect.

In a third aspect, embodiments of the present application further provide a relay control circuit, where the relay control circuit includes a boost circuit, a first switching tube, and a controller; the input end of the booster circuit is electrically connected with the first end of the direct-current power supply; the output end of the booster circuit is electrically connected with the first end of the first coil of the relay; the second end of the first coil is electrically connected with the first end of the first switching tube, and the second end of the first switching tube and the second end of the direct current power supply are grounded; the controller comprises a first output end and a second output end; the first output end of the controller is electrically connected with the control end of the boost circuit; the controller is used for generating a first control signal; the first output end is used for outputting a first control signal to the control end of the boost circuit; the first control signal is used for controlling the working state of the booster circuit; the working states comprise a boosting state and a voltage transmission state; the second output end of the controller is electrically connected with the control end of the first switching tube, and the controller is used for generating a second control signal; the second output end is used for outputting a second control signal to the control end of the first switching tube; the controller outputs a second control signal to the first switching tube through the second output end; the second control signal is used for controlling the on or off of the first switching tube.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1A and 1B are schematic diagrams of the principle of two electromagnetic relays provided in the embodiments of the present application;

fig. 2 is a circuit example diagram of a switching power supply according to an embodiment of the present application;

FIG. 3A is a circuit example diagram of another switching power supply provided in an embodiment of the present application;

FIG. 3B is a circuit example diagram of another switching power supply provided in an embodiment of the present application;

fig. 4 is a schematic circuit diagram of a relay control circuit according to an embodiment of the present disclosure;

FIG. 5 is a circuit example diagram of another relay control circuit provided by an embodiment of the present application;

fig. 6 is a schematic diagram of signal changes of a first output terminal, a second output terminal and a first capacitor of a controller provided in an embodiment of the present application before, during and after the electromagnetic relay is closed;

FIG. 7 is a schematic circuit diagram of another relay control circuit provided in an embodiment of the present application;

fig. 8 is a schematic diagram of signal changes of a first output end, a second output end, a third output end and a first capacitor of another controller provided in the embodiment of the present application before, during and after the electromagnetic relay is attracted;

fig. 9 is a schematic flow chart of a circuit control method provided in an embodiment of the present application.

Detailed Description

Embodiments of the present application are described below with reference to the accompanying drawings in the embodiments of the present application.

Terms related to embodiments of the present application will be described first.

(1) The normally open contact is a contact that the coil in the electromagnetic relay does not contact the armature when not energized.

(2) The normally closed contact is a contact that the coil in the electromagnetic relay contacts the armature when energized.

For simplicity of description, the embodiment of the present application will simply refer to "electromagnetic relay" as "relay".

According to the embodiment of the application, the booster circuit is added in the relay control circuit to increase the voltage applied to the two ends of the coil of the electromagnetic relay, so that the current passing through the coil is increased, the magnetic force is increased, the time of the armature actuation of the relay is shortened, and the response speed of the electromagnetic relay is improved.

The scheme of the embodiment of the application can be applied to a switching power supply.

As shown in fig. 2, the switching power supply may include a direct current power supply, a relay control circuit 10, an electromagnetic relay 20, a two-way power supply circuit, and a voltage conversion circuit 50. The dual supply circuit may include a main supply circuit 30 and a backup supply circuit 40. The switching power supply can realize the switching of the two-way power supply circuit.

The electromagnetic relay 20 includes a coil 12 and an armature 13. The relay control circuit 10 is used to control whether or not power is supplied between the first end and the second end of the coil 12. One end of the armature 13 is connected with a load through a voltage conversion circuit 50, and the other end of the armature 13 is connected with a third end (contact 14) of the electromagnetic relay 20 when the coil is not electrified; the other end of the armature 13 is connected to the fourth end (contact 15) of the electromagnetic relay 20 when the coil 12 is energized.

An input terminal of the main power supply circuit 30 is connected to a first power supply, and an output terminal thereof is electrically connected to a third terminal of the electromagnetic relay 20. The power supply circuit 40 has an input terminal connected to the second power supply and an output terminal electrically connected to the fourth terminal of the electromagnetic relay 20.

The main power supply circuit 30 and the standby power supply circuit 40 are both used for supplying power to the same load. The voltage conversion circuit 50 is used to convert the input power of the power supply circuit into a power supply suitable for use by a load. Illustratively, the main power supply circuit 30 is electrically connected to a first power source, which may be mains electricity (e.g., 220V ac), and the standby power circuit 40 is electrically connected to a second power source, which may be backup power, which is also 220V ac. The voltage conversion circuit 50 is specifically configured to convert 220V ac power into low voltage dc power. The relay control circuit 10 is used to drive on or off of the electromagnetic relay 20, and the electromagnetic relay 20 is used to control switching before the main power supply circuit 30 and the standby power supply circuit 40. In general, the main power supply circuit 30 supplies power to the load, and when the main power supply circuit 30 fails, the relay control circuit 10 may control the electromagnetic relay 20 to switch the power supply circuit of the load to the standby power supply circuit 40.

The dc power supply supplies an operating voltage to the electromagnetic relay 20. It should be noted that the dc power supply may be an auxiliary power supply in the switching power supply or a battery.

Optionally, the switching power supply may further include a detection circuit (not shown in fig. 2) to detect a failure of the main power supply circuit 30, and upon detecting the failure, output a signal to the controller of the relay control circuit 10 to notify the controller of the relay control circuit 10 that the main power supply circuit 30 fails, and in response to the signal, the relay control circuit 10 may control the electromagnetic relay to switch the power supply circuit of the load to the standby power supply circuit 40.

The relay control circuit 10 is connected to a coil in the electromagnetic relay 20 for controlling switching of a contact point of the electromagnetic relay 20 where an armature contacts.

As shown in fig. 3A, the switching power supply for realizing the circuit protection may include a relay control circuit 10, an electromagnetic relay 20, a power supply circuit 60, and a voltage conversion circuit 50. The electromagnetic relay 20 may be connected between the power supply circuit 60 and the voltage conversion circuit 50, and may be used to turn off or on the power supply circuit 60.

As in fig. 2 described above, the electromagnetic relay 20 includes the coil 12 and the armature 13. The relay control circuit 10 is used to control whether or not power is supplied between the first end and the second end of the coil 12. One end of the armature 13 is connected with a load through a voltage conversion circuit 50, and the other end of the armature 13 is connected with a third end of the electromagnetic relay 20 when the coil 12 is not electrified; the other end of the armature 13 is connected to the fourth end of the electromagnetic relay 20 when the coil 12 is energized.

An input terminal of the power supply circuit 60 is connected to a first power supply, and an output terminal thereof is electrically connected to a third terminal of the electromagnetic relay 20.

When the power supply circuit 60 fails, such as a short circuit, the relay control circuit 10 may control the electromagnetic relay 20 to shut off the power supply circuit 60.

Optionally, the circuitry may further include a detection circuit (not shown in fig. 3A) to detect a failure of the power supply circuit 60, and upon detection of the failure, output a signal to the controller of the relay control circuit 10 to notify the controller of the relay control circuit 10 that the power supply circuit 60 is failed, in response to which the relay control circuit 10 may control the electromagnetic relay to shut off the power supply circuit 60.

It should be understood that the switching power supply shown in fig. 2-3A and described above is not limited to a switching power supply, and that the switching power supply may include more or fewer components, as described herein for exemplary purposes only.

As shown in fig. 3B, another application scenario of the relay control circuit and the relay according to the embodiment of the present application may implement protection of the circuit 70 to be protected. As in fig. 3A described above, the electromagnetic relay 20 may be connected between the power supply circuit 60 and the circuit to be protected 70, and may be used to turn off or turn on the power supply circuit 60.

When the power supply circuit 60 fails, such as a short circuit, the relay control circuit 10 can control the electromagnetic relay 20 to cut off the power supply circuit 60, preventing the circuit 70 to be protected from being damaged due to the short circuit.

The relay control circuit according to the embodiment of the present application is specifically described as follows. The relay control circuit may be the relay control circuit in fig. 2, 3A or 3B described above.

As shown in fig. 4, fig. 4 is a schematic structural diagram of a relay control circuit 10 according to an embodiment of the present application, where the circuit includes a boost circuit 101, a first switching tube Q1, and a controller 102. The input end of the boost circuit 101 is electrically connected to a first end of a Direct Current (DC) power supply; an output terminal of the booster circuit 101 is electrically connected to a first terminal of the coil 12 of the electromagnetic relay 20 for boosting a voltage applied across the coil 12. The second end of the coil 12 is electrically connected to the first end of the first switching tube Q1, the second end of the first switching tube Q1 is electrically connected to the second end of the dc power supply, the controller 102 includes a first output end and a second output end, wherein the first output end of the controller 102 is electrically connected to the control end of the boost circuit 101, a first control signal generated by the controller 102 is provided to the boost circuit 101 through the first output end, and the first control signal controls the operating state of the boost circuit 101 through the first output end, and the operating state includes an operating state (boost state) and a stop operating state (also referred to as a voltage transmission state). A second output end of the controller 102 is electrically connected to a control end of the first switching tube Q1, and a second control signal generated by the controller 102 is provided to the first switching tube Q1 through the second output end, where the second control signal is used to control on and off of the first switching tube Q1.

It should be noted that the first control signal and the second control signal may be pulse modulation signals.

In one implementation, the controller 102 controls the boost circuit 101 to operate first to boost the voltage at the first end of the coil 12, when the controller 102 receives a first instruction for instructing the electromagnetic relay to switch the contact, the first switching tube Q1 is controlled to be turned on, the coil 12 is electrified, the armature of the electromagnetic relay 20 is attracted, and after the electromagnetic relay is attracted, the controller 102 controls the boost circuit 101 to be turned off.

In one implementation, when the controller 102 receives a first instruction for instructing the electromagnetic relay to switch the contact, the controller 102 firstly controls the boost circuit 101 to be turned on, the voltage at the first end of the coil 12 is increased, then controls the first switching tube Q1 to be turned on, the coil 12 is electrified, the armature of the electromagnetic relay 20 is attracted, and after the electromagnetic relay is attracted, the controller 102 controls the boost circuit 101 to be turned off.

In another implementation, the electromagnetic relay 20 is a magnetic latching relay, the controller 102 controls the boost circuit 101 to be turned on first, when the controller 102 receives a first instruction for instructing the magnetic latching relay to switch the contact, the first switching tube Q1 is controlled to be turned on, the coil 12 is electrified, the armature of the magnetic latching relay is attracted, and when the magnetic latching relay is attracted, the first switching tube Q1 is controlled to be turned off. At this time, the booster circuit 101 may be turned off or not turned off.

As shown in fig. 5, fig. 5 is an exemplary diagram of a relay control circuit according to an embodiment of the present application, where the relay control circuit is a specific implementation of the relay control circuit shown in fig. 4. In some embodiments, the boost circuit 101 includes a first inductor L1, a second switching tube Q2, a first diode D1, a second diode D2, and a first capacitor C1, where a first end of the first inductor L1 and a first end of the first diode D1 are electrically connected to a first end of the dc power supply; the second end of the first inductor L1, the first end of the second diode D2 and the first end of the second switching tube Q2 are electrically connected. The second end of the first diode D1, the second end of the second diode D2 and the first end of the first capacitor C1 are electrically connected to the first end of the coil 12; the second end of the first capacitor C1 is grounded; the second terminal of the second switching tube Q2 is grounded. The first output end of the controller 102 is electrically connected to the control end of the second switching tube Q2, and the controller 102 provides a first control signal to the second switching tube Q2 through the first output end, where the first control signal is used to control the on and off of the second switching tube Q2.

In some embodiments, the voltage of the first capacitor C1 is equal to the voltage of the direct current power supply DC before the boost circuit 101 operates. Before the electromagnetic relay 20 is turned on, the controller 102 outputs a first control signal through the first output terminal to control the on or off of the second switching tube Q2, so as to boost the voltage of the first capacitor C1 (i.e., the voltage at the first end of the coil 12), so that the boost circuit 101 is in a boost state. When the electromagnetic relay 20 is required to be attracted, the controller 102 receives a first instruction for indicating the electromagnetic relay to switch the contact, and controls the first switching tube Q1 to be conducted through a second control signal output by the second output end, so that the coil 12 is electrified, and the electromagnetic relay 20 is attracted rapidly. After the electromagnetic relay 20 completes the actuation, the first output terminal of the controller 102 outputs a low-level signal to control the second switching tube Q2 to be turned off, so that the boost circuit 101 is in a voltage transmission state, that is, the boost is turned off, at this time, the voltage of the first capacitor C1 is reduced to the voltage of the direct current power supply DC, and the electromagnetic relay 20 maintains the actuation state by the voltage Vdc of the direct current power supply DC. The first output terminal, the second output terminal, and the first capacitor C1 of the controller 102 are shown in fig. 6, which show signal changes before, during, and after the electromagnetic relay 20 is turned on.

It will be appreciated that the signals of the first output terminal, the second output terminal and the first capacitor C1 are schematically illustrated, and that the actual voltage of the first capacitor C1 may fluctuate.

Illustratively, taking the electromagnetic relay 20 with a coil rated voltage of 12V as an example (its operating voltage is equal to or less than 9V, and the release voltage is equal to or greater than 0.6V), assuming that the voltage Vdc of the direct current power supply DC is 6V, the voltage of the first capacitor C1 can be boosted to a relatively high value such as 70V by the booster circuit 101. When the first switching tube Q1 is turned on, compared with the prior art, the voltage applied to the coil 12 can be increased from 12V to 70V, and at this time, the attracting time of the electromagnetic relay 20 is reduced from 20ms to 4ms, so that the response speed of the electromagnetic relay 20 is increased. Further, after the electromagnetic relay 20 is closed, the controller 102 may disconnect the boost circuit 101 (Q2 is driven to be disconnected), the relay coil 12 is powered by the DC power supply DC through the first diode D1, and the closed state of the electromagnetic relay 20 can be maintained by using a voltage of 6V, and the power supply voltage is far lower than the rated 12V voltage of the electromagnetic relay 20 at this time, so that the loss of the relay coil in the maintained state is only 1/4 of the rated value, and the loss of the electromagnetic relay 20 is greatly reduced.

In some embodiments, the controller 102 may also boost the output voltage of the circuit 101, i.e., control the voltage of the first capacitor C1, by controlling the duty cycle of the first control signal.

Illustratively, the controller 102 may obtain the output voltage of the boost circuit 101, and increase the output voltage of the boost circuit 101 by increasing the duty cycle of the first control signal when the output voltage of the boost circuit 101 is less than the preset voltage. When the output voltage of the booster circuit 101 is greater than the preset voltage, the output voltage of the booster circuit 101 is reduced by reducing the duty ratio of the first control signal.

In some embodiments, the time required for the electromagnetic relay 20 to complete the actuation is a first time period, and the controller 102 determines that the electromagnetic relay 20 is complete the actuation when the time period of the second control signal output by the second output terminal is the first time period. The first duration may be 2 milliseconds, 4 milliseconds, 10 milliseconds, etc., and the magnitude of the first duration may be determined by a preset voltage.

In some embodiments, the relay control circuit 10 further includes a detection circuit for detecting whether the electromagnetic relay 20 completes the actuation. An exemplary detection circuit may be electrically connected to the main power supply circuit 30 shown in fig. 2 or the voltage conversion circuit 50 shown in fig. 3A, and the controller 102, where the detection circuit sends a signal for indicating that the electromagnetic relay 20 completes the actuation to the controller 102 when detecting that the main power supply circuit 30 or the voltage conversion circuit 50 is not operating properly, and the controller 102 determines that the electromagnetic relay 20 completes the actuation when receiving the signal.

As shown in fig. 7, fig. 7 is an exemplary diagram of another relay control circuit provided in the embodiment of the present application, and the relay control circuit 10 is another specific implementation of the relay control circuit 10 shown in fig. 5. In some embodiments, the relay control circuit 10 includes a third switching tube Q3 in addition to the components shown in fig. 5. The relay coil includes a coil 12a and a coil 12b, wherein the coil 12a is the coil 12 in fig. 5, and the coil 12a and the coil 12b can be used to control the same armature. The second end of the first diode D1, the second end of the second diode D2 and the first end of the first capacitor C1 are electrically connected to the first end of the coil 12b, the first end of the third switching tube Q3 is electrically connected to the second end of the coil 12b, the second end of the third switching tube Q3 is grounded GND, and the control end of the third switching tube Q3 is electrically connected to the third output end of the controller 102. The controller 102 is also used for controlling the on or off of the third switching tube Q3.

In some embodiments, the electromagnetic relay 20 in fig. 7 is a magnetic latching relay. Before the pull-in, the controller 102 outputs a first control signal through the first output end to control the second switch tube Q2 to be turned on so as to raise the voltage of the first capacitor C1. When the controller 102 receives a first instruction for instructing the magnetic latching relay to attract to the contacts 14a and 14b, the controller 102 controls the first switching tube Q1 to be turned on through a second control signal output by the second output end, so that the coil 12a is electrified, and the magnetic latching relay is attracted quickly. After the latching relay completes the actuation, the second output terminal of the controller 102 outputs a low level signal to control the first switching tube Q1 to be turned off. At this time, the magnetic latching relay is kept on by the internal permanent magnet, the booster circuit 101 works in an idle state, and the relay control circuit is in a low power consumption state. When the controller 102 receives a second instruction for instructing the magnetic latching relay to be attracted to the contact 15a and the contact 15b, the controller 102 outputs a third control signal through a third output end to control the third switching tube Q3 to be turned on, the coil 12b is electrified, the magnetic latching relay rapidly switches the contact position, and after the magnetic latching relay is attracted to the contact 15a and the contact 15b, the third output end of the controller 102 outputs a low-level signal to control the third switching tube Q3 to be turned off. At this time, the magnetic latching relay is kept on, the booster circuit 101 is operated in an idle state, and the relay control circuit is in a low power consumption state. The signal changes of the first output terminal, the second output terminal, the third output terminal, and the first capacitor C1 of the controller 102 before, during, and after the actuation of the magnetic latching relay are as shown in fig. 8.

By way of example, taking a magnetic latching relay with a coil rated voltage of 12V (its operating voltage is less than or equal to 9.6V and its reset voltage is less than or equal to 9.6V), assuming that the voltage Vdc of the DC power supply DC is 12V, the voltage of the first capacitor C1 can be boosted to a relatively high value such as 70V by the booster circuit 101, and when the first switching tube Q1 is turned on, the voltage applied to the coil 12a can be raised from the original 12V to 70V in comparison with the prior art, at this time, the pull-in time of the magnetic latching relay is reduced from 20ms to 4ms, thereby raising the response speed of the magnetic latching relay. Further, after the magnetic latching relay is attracted to the contacts 14a and 14b, the controller 102 may open the first switching tube Q1. At this time, the voltage applied to the relay coil 12a is 0, the booster circuit 101 is operated in an idle state, the magnetic latching relay is maintained in a suction state by means of the internal permanent magnet, and the relay control circuit is in a low power consumption state. When the magnetic latching relay needs to switch the contacts, the controller 102 controls the third switching tube Q3 to be conducted, and the voltage boosting circuit 101 boosts the voltage on the coil 12b, so that the contacts are quickly switched. After the magnetically held relay is attracted to the contacts 15a and 15b, the controller 102 may open the third switching tube Q3. At this time, the voltage applied to the relay coil 12a is 0, the booster circuit 101 is operated in an idle state, the magnetic latching relay is maintained in a suction state by means of the internal permanent magnet, and the relay control circuit is in a low power consumption state.

It should be understood that the configuration of the booster circuit shown in fig. 5 or 7 is not limited to the above, and the booster circuit may be other configurations, which are only exemplified herein.

In the relay control circuit shown in fig. 5 and 7, each of the switching transistors is an NPN transistor or an N-channel enhancement MOS transistor, and in other embodiments, each of the switching transistors in fig. 5 and 7 may be replaced with a PNP transistor or a P-channel enhancement MOS transistor, and at this time, the positive and negative poles of the input power DC are replaced as needed.

Similarly, the on/off of Q1, Q2, and Q3 may be controlled by the controller 102, or may be controlled by other control units, which is not limited in the embodiment of the present application. The Q1, Q2, Q3 may be transistors, MOS transistors, etc. The controller 102 can control the control end of the switching tube, namely the base electrode of the triode and the level of the grid electrode of the MOS tube to control the on and off of the switching tube.

Fig. 9 is a schematic flowchart of a circuit control method according to an embodiment of the present application, where the circuit control method may be implemented based on the relay control circuits shown in fig. 5 and fig. 7, and the method may be implemented by the controller 102 in fig. 5 and fig. 7, and may include all or part of the following steps:

s11: the controller controls the boost circuit to work.

S12: and when receiving a first instruction for indicating the electromagnetic relay to switch the contact, the controller controls the first switching tube to be conducted.

In some embodiments, one implementation of the controller determining that the electromagnetic relay needs to switch contacts may be that the relay control circuit further includes a detection circuit for detecting whether the electromagnetic relay needs to switch contacts.

Illustratively, the method is applied to the dual supply circuitry shown in FIG. 2. When the main power supply circuit 30 fails, the detection circuit detects that the main power supply circuit 30 fails and sends a first instruction to the controller. The controller receives the first instruction, controls the first switching tube to be conducted, switches the contact of the electromagnetic relay, and is provided with a power supply circuit 40 to work.

Illustratively, the method is applied to the protection circuitry shown in FIG. 3B. When the circuit 70 to be protected fails, the detection circuit detects that the circuit 70 to be protected fails and sends a first instruction to the controller. The controller receives a first instruction, controls the first switching tube to be conducted, switches the contact of the electromagnetic relay, and switches the circuit 70 to be protected off.

Optionally, the method may further comprise the steps of:

s13: after the electromagnetic relay is closed, the controller controls the boost circuit to be disconnected.

It should be understood that after the step S13 is completed, the electromagnetic relay maintains the attraction through the voltage of the dc power supply, so as to reduce the loss of the electromagnetic relay.

In other embodiments, the boost circuit may also be controlled to continue to operate after the electromagnetic relay completes the actuation.

In some embodiments, the electromagnetic relay is a magnetic latching relay, and the method may further comprise:

s14: after the magnetic latching relay is attracted, the controller controls the first switching tube to be disconnected.

After the step S14 is completed, the inside of the magnetic latching relay is kept attracted by the permanent magnet, so that the loss of the magnetic latching relay is reduced. At this time, the booster circuit can operate in an idle state, and the self-loss of the booster circuit is low.

After the magnetic latching relay completes the actuation, the first switching tube may be kept conductive, and/or the boost circuit may be controlled to operate or not operate.

In some embodiments, the controller controls the boost circuit to operate through a first control signal output by the first output terminal, and the controller can control the output voltage of the boost circuit by controlling the duty ratio of the first control signal.

Illustratively, the controller obtains an output voltage of the boost circuit, and increases the output voltage of the boost circuit by increasing the duty cycle of the first control signal when the boost circuit output voltage is less than the preset voltage; when the output voltage of the boost circuit is larger than the preset voltage, the duty ratio of the first control signal is reduced to reduce the output voltage of the boost circuit.

In some embodiments, the controller controls the on and off of the first switching tube Q1 through the second control signal output from the second output terminal.

In some embodiments, one implementation of the controller determining that the electromagnetic relay completes the actuation may be that the controller determines that the electromagnetic relay completes the actuation when the duration of outputting the second control signal through the second output terminal is the first duration. The first duration is the time required by the electromagnetic relay to complete the attraction, the first duration can be 2 milliseconds, 4 milliseconds, 10 milliseconds and the like, and the size of the first duration can be determined by a preset voltage.

In some embodiments, another implementation of the controller determining that the electromagnetic relay completes actuation may be that the relay control circuit further includes a detection circuit for detecting whether the electromagnetic relay completes actuation. An exemplary detection circuit is coupled to the operating circuit and the controller, and the controller determines that the electromagnetic relay is engaged when a signal from the detection circuit is received that indicates that the electromagnetic relay is engaged.

The embodiment of the application also provides electronic equipment, which can comprise the switching power supply shown in the above figures 2 and 3A. The electronic device may be a server, a gateway device such as a base station and a router, or a network device, or a terminal device such as a notebook computer, a desktop computer, a tablet computer, a mobile phone, etc. The Server may be a file Server (file Server), a domain control Server (domain Server), a database Server (database Server), a mail Server (mail Server), a Web Server (Web Server), a multimedia Server (multimedia Server), a communication Server (communication Server), a terminal Server (terminal Server), an infrastructure Server (infrastructure Server), a virtualization Server (virtualization Server), and the like. The server may be tower, rack, blade, etc. The electronic device may employ, but is not limited to, an X86 architecture, a reduced instruction set computer (reduced instruction set computer, RISC) architecture, an advanced reduced instruction set machine (advanced RISC machine, ARM) architecture, or the like.

The switch power supply can convert the input power supply into the power supply suitable for the requirement of the server, and provides electric energy for the operation of the server.

It should be noted that the flowchart described in the various embodiments of the present application is only one embodiment. The steps in the various flowcharts may be modified or varied in a number of ways, such as performing the steps in the flowcharts in a different order, or deleting, adding or modifying certain steps, without departing from the spirit of the present application.

"connected" in embodiments of the present application refers to an electrical connection, and two electrical component connections may be direct or indirect connections between two electrical components. For example, a may be directly connected to B, or indirectly connected to B through one or more other electrical components, for example, a may be directly connected to B, or directly connected to C, and C may be directly connected to B, where a and B are connected through C.

In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" means two or more. For example, a plurality of nodes refers to two or more nodes. "at least one" means any number, e.g., one, two, or more.

"A and/or B" may be A alone, B alone, or include A and B. "at least one of A, B and C" may be A only, B only, C only, or include A and B, B and C, A and C, or A, B and C. The terms "first", "second", "third", "fourth", etc. in this application are used only to distinguish between different objects and are not used to indicate priority or importance of the objects.

Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

Claims

1. The switching power supply is characterized by comprising a direct-current power supply, a relay and a relay control circuit;

the relay control circuit comprises a boost circuit, a first switching tube and a controller;

the input end of the boost circuit is electrically connected with the first end of the direct current power supply; the output end of the booster circuit is electrically connected with the first end of the first coil of the relay;

the second end of the first coil is electrically connected with the first end of the first switching tube, and the second end of the first switching tube and the second end of the direct current power supply are grounded;

the controller comprises a first output end and a second output end; the first output end of the controller is electrically connected with the control end of the boost circuit; the controller is used for generating a first control signal; the first output end is used for outputting the first control signal to the control end of the boost circuit;

the first control signal is used for controlling the working state of the booster circuit; the working state comprises a boosting state and a voltage transmission state;

the second output end of the controller is electrically connected with the control end of the first switch tube, and the controller is used for generating a second control signal; the second output end is used for outputting the second control signal to the control end of the first switching tube;

the controller outputs the second control signal to the first switching tube through the second output end; the second control signal is used for controlling the on-off of the first switching tube.

2. The switching power supply of claim 1 wherein said controller is further configured to control said boost circuit to be in a boost state before said relay completes actuation; or the controller is also used for controlling the voltage boosting circuit to be in a voltage transmission state after the relay completes the actuation.

3. The switching power supply according to claim 1 or 2, wherein the controller is further configured to control the output voltage of the booster circuit by controlling the duty ratio of the first control signal.

4. The switching power supply of claim 3 wherein said controller is further configured to increase a duty cycle of said first control signal if it is determined that the voltage at the first end of said first coil is less than a preset voltage; or, in case that the voltage at the first end of the first coil is greater than the preset voltage, decreasing the duty ratio of the first control signal.

5. The switching power supply according to any one of claims 1 to 4, wherein the step-up circuit includes a first inductor, a second switching tube, a first diode, a second diode, and a first capacitor;

the first end of the first inductor and the first end of the second diode are electrically connected with the first end of the direct current power supply; the second end of the first inductor, the first end of the second diode and the first end of the second switching tube are electrically connected; the second end of the first diode, the second end of the second diode and the first end of the first capacitor are electrically connected to the first end of the first coil;

the second end of the first capacitor is grounded; the second end of the second switch tube is grounded; the first output end of the controller is electrically connected with the control end of the second switching tube.

6. The switching power supply of claim 5 wherein said relay is a magnetically held relay; the relay further comprises a second coil, wherein the first coil is used for controlling the armature to be attracted to the first contact, and the second coil is used for controlling the armature to be attracted to the second contact;

the relay control circuit further comprises a third switching tube; wherein the second end of the first diode, the second end of the second diode and the first end of the first capacitor are electrically connected to the first end of the second coil; the first end of the third switching tube is electrically connected with the second end of the second coil, and the second end of the third switching tube is electrically connected with the second end of the direct current power supply;

the controller also comprises a third output end, and the third output end is electrically connected with the control end of the third switching tube; the controller is further used for generating a third control signal, and the third control signal is used for controlling the on and off of the third switching tube; wherein the first switching tube and the third switching tube are not conducted simultaneously.

7. The switching power supply of claim 6 wherein said controller is further configured to control said first switching tube to open after said armature is engaged to said first contact and/or to control said third switching tube to open after said armature is engaged to said second contact.

8. The switching power supply according to any one of claims 1 to 7, further comprising a first power supply circuit and a second power supply circuit; the first power supply circuit and the second power supply circuit are standby power supply circuits;

the output end of the first power supply circuit is electrically connected with the third end of the relay; the output end of the second power supply circuit is electrically connected with the fourth end of the relay; the first power supply circuit is used for supplying power to a load;

the controller is also used for responding to the fault of the first power supply circuit and controlling the relay to switch the second power supply circuit to supply power for the load.

9. The switching power supply according to any one of claims 1 to 7, further comprising a third power supply circuit; the input end of the third power supply circuit is electrically connected with the fifth end of the relay; the third power supply circuit is used for supplying power to a load;

the controller also controls the relay to cut off the power supply of the third power supply circuit in response to the failure of the third power supply circuit.

10. An electronic device comprising a switching power supply as claimed in any one of claims 1-9.