CN111786369A - Surge protection device and method and household electrical appliance - Google Patents

Abstract

The invention discloses a surge protection device and a method thereof, and household electrical appliance equipment, wherein the device comprises: the surge detection part is used for detecting a main power supply provided by a power supply and determining whether a surge signal exceeding a preset threshold value exists in the main power supply; a backup power supply unit for generating a backup power supply; and a switching unit configured to control the auxiliary power supply unit to supply power to the electric device when the main power supply has a surge signal exceeding a preset threshold, and to control the main power supply unit to supply power to the electric device when the main power supply does not have a surge signal exceeding a preset threshold. The invention has the advantages of surge detection, effective prevention of surge damage and good surge protection performance.

Description

Surge protection device and method and household electrical appliance

Technical Field

The invention relates to the technical field of surge protection, in particular to a surge protection device and method and household electrical appliance equipment.

Background

The surge is instantaneous overvoltage or overcurrent exceeding normal working voltage or current, is also called transient pulse, transient overvoltage, surge and the like, is transient current and voltage fluctuation, almost all electric equipment and devices can generate a surge phenomenon and are damaged by the surge, and the damage easily causes performance degradation, short service life, failure or direct damage of the devices or the equipment, especially in some application occasions with poor field environment.

As a switching power supply commonly used in a power supply device, a situation that an internal power switch device is damaged due to surge impact often occurs, for example, an MOS transistor is exploded, and then a power supply function of the power supply device is all failed, so that operation of the whole device is affected, and the situation also exists in the household appliance industry.

Aiming at the harm of the surge phenomenon to the switching power supply and the power supply device, the following solving modes are mainly adopted in the prior art: the voltage resistance and current resistance of related devices of the switching power supply are improved, for example, the voltage resistance parameters and processes of a power switching device are enhanced, so that when a surge phenomenon occurs, the high-voltage-resistance and high-current-resistance device can resist surge impact. The mode does not have surge detection, has certain requirements on the process and technology for improving the voltage-resistant and current-resistant parameters, and the device with high voltage resistance and high current resistance can not resist all surge problems and can not effectively prevent surge damage.

Disclosure of Invention

The invention provides a surge protection device which has the advantages of surge detection, effective prevention of surge damage and good surge protection performance, a corresponding surge protection method and household electrical appliances with the surge protection device.

The invention adopts a technical means that: there is provided a surge protection device comprising:

the surge detection part is used for detecting a main power supply provided by a power supply and determining whether a surge signal exceeding a preset threshold value exists in the main power supply;

a backup power supply unit for generating a backup power supply; and

and the switching part is used for controlling the standby power supply part to supply power to the electric equipment under the condition that the main power supply has a surge signal exceeding a preset threshold value, and controlling the main power supply part to supply power to the electric equipment under the condition that the main power supply does not have the surge signal exceeding the preset threshold value.

The invention adopts another technical means that: provided is a surge protection method, including:

detecting a total power supply provided by a power supply, and determining whether the total power supply has a surge signal exceeding a preset threshold value;

and controlling the standby power supply unit to supply power to the electric equipment when the main power supply has a surge signal exceeding a preset threshold, and controlling the main power supply unit to supply power to the electric equipment when the main power supply does not have a surge signal exceeding a preset threshold.

The invention adopts another technical means that: provided is a home appliance including:

a power supply for supplying a main power using an external power;

the main power supply part can be connected with the power supply and is used for inputting the total power supply and generating a main power supply for supplying power to electric equipment; and

the surge protection device.

By adopting the technical scheme, the surge protection device, the method and the household appliance provided by the invention can detect whether the surge signal exceeding the preset threshold value exists in the total power supply provided by the power supply, and the surge signal exceeding the preset threshold value exists in the total power supply, and the main power supply part for normally supplying power is switched by the standby power supply part, so that the main power supply part is not used for supplying power for the electric equipment, and the standby power supply part is used for supplying power for the electric equipment when the large surge signal exists in the input of the main power supply part, and the main power supply part is effectively protected from surge impact and damage. The surge detection device has a surge detection function, and the working state of the device can be adjusted according to the surge detection condition. Compared with the improvement of the voltage resistance and the current resistance of devices in the main power supply part, the invention does not need specific process support by increasing the standby power supply part, can adapt to more surge environments and has good surge protection performance.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Wherein:

fig. 1 is a block diagram of the structure of a surge protection device in one embodiment;

fig. 2 is a block diagram of the structure of a surge protection device in one embodiment;

fig. 3 is a block diagram showing the structure of a surge detecting section in one embodiment;

FIG. 4 is a block diagram showing the structure of a switching unit according to an embodiment;

fig. 5 is a block diagram of the structure of a surge protection device in one embodiment;

fig. 6 is a circuit schematic of a surge protection device in one embodiment;

fig. 7 is a flow diagram of a surge protection method in one embodiment;

FIG. 8 is a flow chart of step 1 in one embodiment;

FIG. 9 is a flowchart of the operation of the control section in one embodiment;

fig. 10 is a block diagram of a home device in one embodiment.

In the figure: 1. surge protection device, 2, power supply, 3, main power supply portion, 4, consumer, 11, surge detection portion, 12, reserve power supply portion, 13, switching portion, 14, control portion, 15, power supply module, 111, sampling module, 112, reference voltage module, 113, comparison module, 114, change-over switch module, 131, switch control module, 132, controllable switch.

Detailed Description

In order to make the objects, technical solutions and technical effects of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

The present invention provides a surge protection device 1, as shown in fig. 1, which in one embodiment may comprise: surge detecting unit 11, backup power feeding unit 12, and switching unit 13. The surge detection part 11 is used for detecting the total power supply provided by the power supply 2 and determining whether the total power supply has a surge signal exceeding a preset threshold value. The backup power supply unit 12 is used to generate a backup power supply. The switching unit 13 is configured to control the auxiliary power supply unit 12 to supply power to the electric device 4 when the main power supply has a surge signal exceeding a preset threshold, and control the main power supply unit 3 to supply power to the electric device 4 when the main power supply does not have a surge signal exceeding a preset threshold.

In this embodiment, the power supply 2 may be a power interface of an external power supply system, and the external power supply system may be, for example, a commercial power grid. Besides the power interface, the power supply 2 may further include a power supply circuit for processing power provided by an external power supply system, and the power supply circuit may include a rectifier module, but of course, the power supply circuit may also be configured with other power processing or converting modules as needed. When the power supply 2 only includes a power interface of an external power supply system, a power supply circuit for supplying power to the external power supply system to process may be disposed in the backup power supply unit 12 or the main power supply unit 3, for example, the backup power supply unit 12 and the main power supply unit 3 may include a rectifier module. When the power supply 2 includes both a power interface and a power supply circuit, the backup power supply unit 12 and the main power supply unit 3 may include other modules connected to the power supply circuit, for example, if the power supply circuit is a rectifier module, the backup power supply unit 12 and the main power supply unit 3 may include a filter module, a voltage regulator module, a voltage conversion module, and the like.

It can be seen that a series of power supply circuits for processing power provided by an external power supply system into power required by the electric equipment 4 may be distributed among the power supply unit 2, the main power supply unit 3 and the standby power supply unit 12, for example, if the series of power supply circuits includes a module one, a module two and a module three, the power supply unit 2 may include a power interface, the main power supply unit 3 and the standby power supply unit 12 are configured with the module one to the module three, the power supply unit 2 may include the power interface and the module one, the main power supply unit 3 and the standby power supply unit 12 are configured with the module two to the module three, and of course, the power supply unit 2 may include the power interface, the module one and the module two, and the main power supply unit 3 and the standby power supply unit 12 are configured with the module three. The power supply 2 provides a total power supply, when the power supply 2 only includes a power interface, the total power supply is the power output by the external power supply system, when the power supply 2 includes a power interface and a power supply circuit, the total power supply is the power obtained after the power supply 2 performs power processing on the external power supply system, for example, the power output after the rectification module performs rectification processing on the external power supply system is the total power supply. Fig. 6 shows a schematic circuit diagram of the surge protection device 1 in an embodiment, and exemplarily, referring to fig. 6, the external power supply system is a utility grid, the power supply 2 includes power interfaces L and N, and further includes a rectifier bridge D1, the total power is an output power obtained by rectifying the utility grid by the rectifier bridge D1, and is output between a network reference a and a ground terminal in fig. 6.

In this embodiment, the surge detecting unit 11 is configured to detect whether there is a surge signal exceeding a preset threshold in the main power supply, and the preset threshold is used as a criterion for determining whether the surge signal exceeds the preset threshold, where the preset threshold may be preset, specifically, may be determined according to a surge-resistant condition of the components of the main power supply unit 3, and is exemplarily any voltage value within a range of 200V to 1200V or any current value within a range of 5A to 15A, and of course, the preset threshold may also be set as another voltage threshold or current threshold as needed. Illustratively, a preset threshold may be set according to the voltage resistance characteristic and the current resistance characteristic of the power switching device included in the main power supply section 3 to ensure that a surge signal lower than the preset threshold does not cause surge impact or damage to the constituent elements of the main power supply section 3, illustratively, if the voltage resistance performance or the current resistance performance of the power switching device included in the main power supply section 3 is low, the preset threshold may be set correspondingly low, and if the voltage resistance performance or the current resistance performance of the power switching device included in the main power supply section 3 is high, the preset threshold may be set correspondingly high. The method comprises the steps that when a surge signal in the main power supply exceeds a preset threshold value, the standby power supply part 12 is started to supply power to the electric equipment 4, when the surge signal in the main power supply is lower than the preset threshold value or the surge signal does not exist in the main power supply, the main power supply part 3 is continuously kept supplying power to the electric equipment 4, namely, under the normal condition, a main power supply generated by the main power supply part 3 serves as a power supply of the electric equipment 4, and when the surge signal in the main power supply exceeds the preset threshold value, the standby power supply generated by the standby power supply part 12 serves as the power supply of the electric equipment 4. Specifically, the switching unit 13 switches and controls which of the main power supply unit 3 and the backup power supply unit 12 is used as the power supply source of the electric device 4. The surge signal may be at least one of a surge voltage and a surge current, that is, the surge signal may be a surge voltage, a surge current, or a surge voltage and a surge current occurring at the same time. The electric device 4 may be another electric component, and may also include an electric component constituting the surge protection device 1 of the present embodiment.

The device of this embodiment can detect whether have the surge signal that exceeds preset threshold value in the total power that power supply 2 provided to have the surge signal that exceeds preset threshold value in the total power, main power supply portion 3 that will normally supply power utilizes reserve power supply portion 12 to switch, with the realization when there is great surge signal in the input of main power supply portion 3, need not main power supply portion 3 for consumer 4 power supply, and adopt reserve power supply portion 12 to supply power for consumer 4, and then effectual protection main power supply portion 3 avoids surge impact and harm. The surge detection device has a surge detection function, and the working state of the device can be adjusted according to the surge detection condition. Compared with the improvement of the voltage resistance and the current resistance of the devices in the main power supply part 3, the invention does not need specific process support by increasing the standby power supply part 12, can adapt to more surge environments and has good surge protection performance.

In one embodiment, as shown in fig. 2, the apparatus may further include a control portion 14. The control unit 14 is connected to the surge detection unit 11 and the switching unit 13, and is configured to control the switching operation of the switching unit 13 according to whether or not there is a surge signal exceeding a preset threshold in the main power supply. Fig. 6 shows a schematic circuit diagram of the surge protection device 1 in an embodiment, and referring to fig. 6, for example, the control unit 14 employs a single chip Microcomputer (MCU), and of course, the control unit 14 may also be a microcontroller, a CPU, a microprocessor, an FPGA, a DSP, or other control modules with equivalent functions. The control section 14 may generate a control signal for switching operation of the switching section 13 based on whether or not there is a surge signal exceeding a preset threshold in the total power supply from the surge detecting section 11.

In one embodiment, as shown in fig. 3, the surge detecting portion 11 may include: a sampling module 111, a reference voltage module 112, and a comparison module 113. The sampling module 111 is configured to detect a total power supply provided by the power supply 2 and convert the total power supply into a sampling voltage, specifically, the sampling module 111 may detect a voltage and/or a current of a power supply loop of the total power supply, and convert the obtained detection voltage and/or detection current into the sampling voltage, if the total power supply has a surge signal, the obtained detection voltage and detection current may have a higher voltage value and a higher current value, and then the converted sampling voltage value is also higher. The reference voltage module 112 is configured to provide a reference voltage, and a specific value of the reference voltage may be set according to the aforementioned preset threshold condition of the surge signal.

The comparing module 113 is connected to the sampling module 111 and the reference voltage module, and configured to compare the sampling voltage and the reference voltage and obtain a comparison result. In the case that there is a surge signal exceeding a preset threshold in the total power supply, the sampling voltage is higher than the reference voltage, and the comparing module 113 obtains a first comparison result, that is, when the comparing module 113 outputs the first comparison result, it indicates that there is a surge signal exceeding a preset threshold in the total power supply. When the comparison module 113 outputs the second comparison result, it indicates that the total power supply does not have the surge signal exceeding the preset threshold, and the surge signal may not exist in the total power supply or may be lower than the preset threshold.

The first comparison result and the second comparison result are configured as signals with opposite level logic states in order to distinguish the two comparison results. For example, the second comparison result may be a low logic level when the first comparison result is a high logic level, and the second comparison result may be a high logic level when the first comparison result is a low logic level. Fig. 6 shows a schematic circuit diagram of the surge protection device 1 in an embodiment, and illustratively, the first comparison result is a high logic level and the second comparison result is a low logic level.

The present embodiment can realize that the operation of the backup power supply section 12 is started when necessary to protect the main power supply section 3 from the impact of the surge signal exceeding its receiving range, by the configuration of the surge detection section 11, using the surge signal detection result.

In one embodiment, as shown in fig. 3, the comparison module 113 may output the obtained comparison result to the control part 14 as an interrupt source. When the control unit 14 receives the first comparison result, it indicates that there is a surge signal exceeding a preset threshold in the total power supply, the control unit 14 performs an interrupt response, and generates a first control signal to the switching unit 13, and the switching unit 13 controls the backup power supply unit 12 to supply power to the electric equipment 4 based on the received first control signal. When the control unit 14 receives the second comparison result, it indicates that there is no surge signal exceeding a preset threshold in the total power supply, the control unit 14 does not perform an interrupt response, and generates a second control signal to the switching unit 13, and the switching unit 13 controls the main power supply unit 3 to supply power to the electric device 4 based on the received second control signal. The first control signal and the second control signal are configured as signals with opposite level logic states so as to distinguish the two control signals. For example, the second control signal may be a low logic level when the first control signal is a high logic level, and the second control signal may be a high logic level when the first control signal is a low logic level. Fig. 6 shows a circuit schematic diagram of the surge protection device 1 in an embodiment, and illustratively, the first control signal is at a low logic level and the second control signal is at a high logic level.

The present embodiment notifies the processing center of the surge protection device 1, that is, the control unit 14, in an interrupt manner when detecting that there is a surge signal exceeding a preset threshold in the total power supply, so that the control unit 14 can better and faster utilize limited system resources to provide higher response speed and operation efficiency, thereby ensuring the effectiveness of surge protection. Fig. 6 shows a schematic circuit diagram of the surge protection device 1 in an embodiment, and exemplarily referring to fig. 6, the control unit 14 employs a single chip Microcomputer (MCU), the comparison module 113 transmits the obtained comparison result to an INT port of the MCU as an interrupt source, and the generated first control signal or second control signal is output from an IO port of the MCU.

In one embodiment, while the control unit 14 generates the first control signal to the switching unit 13, the control unit 14 may determine whether or not a surge signal exceeding a preset threshold occurs in the total power supply at regular intervals. If the surge signal exceeding the preset threshold value does not appear in the total power supply within the fixed time, the control unit 14 generates the second control signal to the switching unit 13, for example, the fixed time may be 0.5s to 10s, for example, 0.5s, 1s, 3s, 10s, and the like, and of course, the fixed time may be set to other time periods according to actual needs. Fig. 9 shows a flow chart of the operation of the control unit 14 in one embodiment, and as shown in fig. 9, the operation flow of the control unit 14 includes the following steps:

in step a, the IO port of the control unit 14 outputs a first control signal. After the power-on reset, the control unit 14 first enables its IO port to output the first control signal, and then executes step B.

Step B, the INT port of the control section 14 receives the first comparison result or the second comparison result; when the first comparison result is a high logic level and the second comparison result is a low logic level, the control unit 14 detects whether the level of the INT port of the control unit is high or low, and when the INT port is a high level, it indicates that the first comparison result is received, and when the INT port is a low level, it indicates that the second comparison result is received, and at this time, the interrupt signal is invalid, and the control unit 14 does not generate an interrupt response. Further, step D is executed when the INT port of the control unit 14 receives the first comparison result, and step C is executed when the INT port of the control unit 14 receives the second comparison result.

And step C, outputting a second control signal by the IO port of the control part 14, returning to the step B, and continuously judging whether the INT port of the control part 14 receives the first comparison result or the second comparison result.

And step D, the IO port of the control unit 14 outputs a first control signal, and step E is executed.

And step E, the control part 14 judges whether surge signals exceeding a preset threshold value appear in the total power supply at regular time intervals. Specifically, if the surge signal exceeding the preset threshold value does not appear in the total power supply within the fixed time, the step C is executed again. If the surge signal exceeding the preset threshold appears in the main power supply within the fixed time, step E is continuously executed, that is, if the surge signal exceeding the preset threshold appears in the main power supply after the first fixed time, it is determined whether the surge signal exceeding the preset threshold appears in the main power supply within the second fixed time, N fixed times can be continued, which is equivalent to that whether the surge signal exceeding the preset threshold appears in the main power supply within the fixed time is determined N times, until the surge signal exceeding the preset threshold does not appear in the main power supply within a certain fixed time, the IO port of the control part 14 is changed from outputting the first control signal to outputting the second control signal.

The control part 14 of the present embodiment makes the surge detection and the surge protection control fully combined through a specific logic and work flow, and further improves the reliability of the surge protection.

In one embodiment, as shown in fig. 3, the surge detection part 11 may further include a change-over switch module 114. The comparison module 113 is connected to the switching unit 13 via the change-over switch module 114. The switch module 114 can be controlled by the comparison result obtained by the comparison module 113, and obtain a third control signal to transmit to the switching part 13. Specifically, the switch module 114 performs switching based on the comparison result output by the comparison module 113. For example, when the comparison result is a high logic level, the change-over switch module 114 is turned on to obtain the third control signal as a low logic level, and when the comparison result is a low logic level, the change-over switch module 114 is turned off, and the third control signal as a high impedance state does not affect the control of the switching unit, and at this time, the switching unit 13 is controlled by the second control signal generated by the control unit 14.

Referring to fig. 6, the transfer switch module 114 may include a switch Q2 and a resistor 12, for example. The switching tube Q2 is connected to the comparing module 113 via the resistor R12, specifically, the base of the switching tube Q2 is connected to the output end of the comparator U2 via the resistor R12, the collector of the switching tube Q2 is connected to the switching unit 13, specifically, the collector of the switching tube Q2 is connected to the base of the switching tube Q1, and the emitter of the switching tube Q2 is grounded. The switching tube Q2 shown in fig. 6 is a triode, which can be replaced by a MOS transistor, an IGBT, and other electronically controllable switches.

In one embodiment, as shown in fig. 4, the switching part 13 may include: a switch control module 131 and a controllable switch 132. The switching control module 131 is connected to the control unit 14 and the surge detection unit 11, and configured to issue a switching control signal based on the first control signal or the second control signal generated by the control unit 14 and the third control signal output by the surge detection unit 11. The switch control signal may be generated based on the first control signal and the third control signal, or may be generated based on the second control signal and the third control signal. Referring to fig. 6, the first control signal and the second control signal are exemplarily output from an IO port of an MCU included in the control unit 14, the third control signal is output from a collector of a switching tube Q2 included in the transfer switch module 114, the first control signal and the third control signal meet at a network reference numeral D in fig. 6, and the second control signal and the third control signal meet at a network reference numeral D in fig. 6.

In this embodiment, the controllable switch 132 is controlled by the switch control signal to adjust its own operating state, and the switch control signal may control the controllable switch 132 to switch on the power supply 2 and the main power supply unit 3, or may control the controllable switch 132 to switch on the power supply 2 and the standby power supply unit 12.

Referring to fig. 6, when the comparator U2 outputs a high level, the switch Q2 is turned on, the collector of the switch Q2 is grounded, and the third control signal output by the switch module 114 is at a low level. When the comparator U2 outputs a low level, the switch Q2 is not turned on, and the third control signal output by the switch module 114 is in a high-impedance state.

Fig. 6 shows a schematic circuit diagram of the surge protection device 1 in an embodiment, and as shown in fig. 6, the controllable switch 132 may comprise a RELAY 1. The RELAY1 has a coil, a common contact a, a normally open contact B and a normally closed contact C. One end of the coil receives the switch control signal, and the other end of the coil can be connected to a power supply terminal V3 of the power supply module 15, that is, the coil can be supplied with power by the power supply module 15. The common contact a is connected to the power supply 2, specifically, the common contact a may be connected to a rectifier bridge output terminal included in the power supply 2, the normally open contact B is connected to the main power supply portion 3, and the normally closed contact C is connected to the standby power supply portion 12. The RELAY RELAY1 has at least 2 working states, wherein one working state is that the coil is not powered, the common contact A of the RELAY RELAY1 is connected with the normally closed contact C, the standby power supply part 12 works, the other working state is that the coil is powered, the common contact A of the RELAY RELAY1 is connected with the normally open contact B, and the main power supply part 3 works. For example, referring to fig. 6, the switch control module 131 may include a resistor R1, a resistor R2, and a switch Q1, and the switch Q1 shown in fig. 6 is a triode, but may also be a MOS transistor, another electronically controllable switch, and the like. One end of the resistor R1 is connected to the control unit 14, specifically, one end of the resistor R1 is connected to an IO port of the MCU, the other end of the resistor R1 is connected to the transfer switch module 114 and the base of the switch tube Q1, two ends of the resistor R2 are respectively connected to the base and the emitter of the switch tube Q1, and the collector of the switch tube Q1 is connected to the coil.

The operation flow of switching the backup power supply unit 12 and the main power supply unit 3 by the RELAY1 will be described.

For example, as shown in fig. 6, when the sampling voltage is higher than the reference voltage, the comparator U2 outputs a high level, the INT port of the MCU is at a high level, and the switching tube Q2 is turned on. When the INT port of the MCU is at a high level, the IO port of the MCU correspondingly outputs a low level, the collector of the switching tube Q2 that is turned on is at a low level, and the network symbol D in fig. 6 is at a low level, and further the switching tube Q1 is turned off, the coil of the RELAY1 is not powered, the common contact a is connected to the normally closed contact C, and the standby power supply unit 12 operates.

For example, as shown in fig. 6, when the sampling voltage is lower than the reference voltage, the comparator U2 outputs a low level, the INT port of the MCU is a low level, and the switching tube Q2 is not turned on. When the INT port of the MCU is at a low level, the IO port of the MCU outputs a high level, and the network label D in fig. 6 is at a high level, so that the switching tube Q1 is turned on, the coil of the RELAY1 supplies power, the common contact a is connected to the normally open contact B, and the main power supply unit 3 operates.

The above only shows a specific embodiment, and in practice, other circuits with equivalent functions may be used instead. The switching operation of the switching section 13 is controlled collectively based on both of the surge detection section 11 and the control section 14, so that the surge protection execution is more stable.

Fig. 6 shows a schematic circuit diagram of the surge protection device 1 in one embodiment, and as shown in fig. 6, the sampling module 111 may include a first voltage dividing circuit and a first rectifying and filtering circuit. The first voltage division circuit is used for dividing the total power supply and obtaining a first voltage. The first rectifying and filtering circuit is used for rectifying and filtering the first voltage to obtain the sampling voltage. The reference voltage module 112 may include an integration circuit and a reference voltage circuit. The integrating circuit is connected to the control unit 14, and is configured to integrate the PWM signal output by the control unit 14 and obtain a voltage adjustment signal. The reference voltage circuit is used for providing reference voltage, and outputting the reference voltage after adjusting the reference voltage by using the voltage adjusting signal. The comparison module 113 may include a comparator U2. The non-inverting input terminal of the comparator U2 receives the sampling voltage, the inverting input terminal of the comparator U2 receives the reference voltage, and the output terminal of the comparator U2 outputs the comparison result of the sampling voltage and the reference voltage.

Illustratively, referring to fig. 6, the first voltage dividing circuit includes a resistor R3, a resistor R4, and a resistor R5. The first rectifying and filtering circuit comprises a diode D10, a capacitor C6 and a resistor R6. The integrating circuit comprises a diode D12, a resistor R7 and a capacitor C5, wherein the anode of the diode D12 is connected with the control part 14, specifically, the anode of the diode D12 is connected with the PWM port of the MCU, and the PWM port of the MCU is used for outputting a PWM signal. The reference voltage circuit comprises a resistor R8, a resistor R9 and a capacitor C5.

The purpose of adjusting the reference voltage is further achieved by changing the reference voltage provided by the reference voltage circuit.

In one embodiment, the switching part 13 may control one of the standby power supply part 12 and the main power supply part 3 to be connected to the power supply 2. The backup power supply 12 may include a surge protection element, which may be a discharge tube, a transient suppression diode, a zener diode, a capacitor, and combinations of at least 2 of the foregoing.

In one embodiment, as shown in fig. 6, the backup power supply part 12 may include a backup resistor R11, a backup diode D9, a backup capacitor C3, and a backup zener diode DZ 1. One end of the backup resistor R11 is connected to the switching unit 13, specifically, one end of the backup resistor R11 is connected to the normally closed contact C of the RELAY1, one end of the backup resistor R11 is connected to the output end of the rectifier bridge when the normally closed contact C of the RELAY1 is connected to the common contact a, and one end of the backup resistor R11 is not connected to the output end of the rectifier bridge when the normally open contact B of the RELAY1 is connected to the common contact a. The other end of the spare resistor R11 is connected with the ground end after sequentially passing through the spare diode D9, the spare capacitor C3 and the spare voltage stabilizing diode DZ1 which are connected in parallel. The cathode of the standby voltage stabilizing diode DZ1 is used as a standby power supply end V2, and the cathode is connected with the ground end. In addition to supplying the backup power, the backup power supply unit 12 of the present embodiment can absorb and suppress the surge shock by the backup capacitor C3 and the backup zener diode DZ1 connected in parallel to each other, and thus has a surge protection effect.

In one embodiment, as shown in fig. 5, the surge protection device 1 may further include a power supply module 15. The power supply module 15 is connected to the backup power supply unit 12 and the main power supply unit 3, and is configured to provide a working power supply to the surge protection device 1 by using the main power supply or the backup power supply. Illustratively, referring to fig. 6, the power supply module 15 includes a diode D6, a diode D7, and a capacitor C2. An anode of the diode D6 is connected to a main power supply terminal V1 of the main power supply unit 3, an anode of the diode D7 is connected to a standby power supply terminal V2 of the standby power supply unit 12, a cathode of the diode D6 and a cathode of the diode D7 are connected to one end of the capacitor C2, the one end of the capacitor C2 serves as a power supply terminal V3 of the power supply module 15, and the other end of the capacitor C2 is connected to a ground terminal. The power supply terminal V3 of the power supply module 15 may be connected to the VCC port of the MCU.

The present invention also provides a surge protection method, which in one embodiment, as shown in fig. 7, may include:

step S1, the total power provided by the power supply 2 is detected, and it is determined whether there is a surge signal exceeding a preset threshold in the total power.

In step S2, when the main power supply has a surge signal exceeding a preset threshold, the backup power supply unit 12 is controlled to supply power to the electric equipment 4.

In step S3, when the total power supply does not have a surge signal exceeding a preset threshold, the main power supply unit 3 is controlled to supply power to the electric equipment 4.

In one embodiment, as shown in fig. 8, the step of detecting the total power provided by the power supply 2 and determining whether there is an inrush signal exceeding a preset threshold in the total power, i.e., step S1, may include:

step S11, the total power provided by the power supply 2 is detected and converted into a sampling voltage.

And step S12, comparing the sampling voltage with the reference voltage and obtaining a comparison result.

Step S13, in case the sampling voltage is higher than the reference voltage, obtaining a first comparison result.

Step S14, in case the sampling voltage is lower than the reference voltage, obtaining a second comparison result.

The present invention also provides a home appliance, which in one embodiment, as shown in fig. 10, may include: a power supply 2, a main power supply part 3 and the surge protection device 1 of any of the above embodiments. The power supply 2 is used for providing the total power by an external power supply system. The main power supply part 3 can be connected with the power supply 2 and is used for inputting the main power and generating a main power supply for supplying power to the electric equipment 4; the backup power supply unit 12 is connectable to the power supply unit 2, and is configured to input the main power and generate an auxiliary power for supplying power to the electric device 4. The electric device 4 may be an electric component in a household appliance.

Referring to fig. 6, the power supply 2 of the present embodiment may include a rectifier bridge including a diode D1, a diode D2, a diode D3, and a diode D4. The main power supply part 3 may include a diode D5, a capacitor C1, and a switching power supply 201. The anode of the diode D5 is connected to the switching unit 13, specifically, the anode of the diode D5 is connected to the normally open contact B of the RELAY1, the cathode of the diode D5 is connected to the input terminal of the switching power supply 201, the anode of the diode D5 is connected to the output terminal of the rectifier bridge when the normally open contact B of the RELAY1 is connected to the common contact a, and the anode of the diode D5 is not connected to the output terminal of the rectifier bridge when the normally closed contact C of the RELAY1 is connected to the common contact a. The capacitor C1 is connected in parallel between the input terminals of the switching power supply 201. The output terminal of the switching power supply 201 serves as a main power supply V1 and is connected to the ground terminal. The switching power supply 201 has a power switching device, such as a MOS transistor, therein.

The household appliance provided with the surge protection device 1 in the embodiment can fully improve the surge impact resistance of the main power supply part 3, and provides a surge protection mechanism with more flexibility and wider adaptation for the surge problem.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (11)

1. A surge protection device, the device comprising:

the surge detection part is used for detecting a main power supply provided by a power supply and determining whether a surge signal exceeding a preset threshold value exists in the main power supply;

a backup power supply unit for generating a backup power supply; and

and the switching part is used for controlling the standby power supply part to supply power to the electric equipment under the condition that the main power supply has a surge signal exceeding a preset threshold value, and controlling the main power supply part to supply power to the electric equipment under the condition that the main power supply does not have the surge signal exceeding the preset threshold value.

2. The surge protection device of claim 1, further comprising:

and the control part is connected with the surge detection part and the switching part and is used for controlling the switching operation of the switching part according to whether the surge signal exceeding a preset threshold value exists in the main power supply.

3. The surge protection device according to claim 2, wherein the surge detection portion includes:

the sampling module is used for detecting a total power supply provided by the power supply and converting the total power supply into sampling voltage;

a reference voltage module for providing a reference voltage; and

the comparison module is connected with the sampling module and the reference voltage module and is used for comparing the sampling voltage with the reference voltage and obtaining a comparison result;

in the case of a surge signal exceeding a preset threshold in the total power supply, the sampling voltage is higher than the reference voltage, and the comparison module obtains a first comparison result;

in the case that the total power supply does not have a surge signal exceeding a preset threshold, the sampling voltage is lower than the reference voltage, and the comparison module obtains a second comparison result.

4. The surge protection device of claim 3,

the comparison module outputs the obtained comparison result to the control part as an interrupt source;

when the control part receives the first comparison result, the control part carries out interrupt response and generates a first control signal to the switching part; the switching part controls the standby power supply part to supply power to the electric equipment based on the received first control signal;

when the control part receives the second comparison result, the control part does not perform interrupt response and generates a second control signal to the switching part; the switching part controls the main power supply part to supply power to the electric equipment based on the received second control signal.

5. The surge protection device of claim 4,

when the control part generates the first control signal to the switching part, the control part judges whether surge signals exceeding a preset threshold value appear in the main power supply at fixed time intervals;

and if the surge signal exceeding a preset threshold value does not appear in the main power supply within the fixed time, the control part generates the second control signal to the switching part.

6. The surge protection device according to claim 4, wherein the surge detection portion further comprises: a transfer switch module; the comparison module is connected with the switching part through the change-over switch module; the change-over switch module is controlled by the comparison result obtained by the comparison module, obtains a third control signal and transmits the third control signal to the switching part.

7. The surge protection device of claim 6, wherein the switching portion comprises:

a switching control module connected to the control unit and the surge detection unit, for generating a switching control signal based on the first control signal or the second control signal generated by the control unit and the third control signal output by the surge detection unit; and

a controllable switch; the controllable switch is controlled by the switch control signal to adjust the working state of the controllable switch, and the controllable switch comprises: a relay; the relay is provided with a coil, a common contact, a normally closed contact and a normally open contact; one end of the coil receives the switch control signal, and the other end of the coil is connected with a power supply end; the public contact is connected with the power supply, the normally open contact is connected with the main power supply part, and the normally closed contact is connected with the standby power supply part.

8. The surge protection device of any of claims 3 to 5,

the sampling module comprises:

the first voltage division circuit is used for dividing the total power supply to obtain a first voltage;

the first rectifying and filtering circuit is used for rectifying and filtering the first voltage to obtain the sampling voltage;

the reference voltage module includes:

the integrating circuit is connected with the control part and is used for integrating the PWM signal output by the control part and obtaining a voltage adjusting signal;

the reference voltage circuit is used for providing reference voltage, adjusting the reference voltage by using the voltage adjusting signal and outputting the reference voltage;

the comparison module comprises: a comparator; the non-inverting input end of the comparator receives the sampling voltage, the inverting input end of the comparator receives the reference voltage, and the output end of the comparator outputs the comparison result of the sampling voltage and the reference voltage.

9. The surge protection device of claim 1,

the switching part controls one of the standby power supply part and the main power supply part to be connected with a power supply;

the backup power supply portion includes a surge protection element, and the backup power supply portion further includes: the standby resistor, the standby diode, the standby capacitor and the standby voltage stabilizing diode; one end of the standby resistor is connected with the switching part, and the other end of the standby resistor is connected with a grounding end after sequentially passing through the standby diode, the standby capacitor and the standby voltage stabilizing diode which are mutually connected in parallel; and/or the presence of a gas in the gas,

the surge protection device further comprises: and the power supply module is connected with the standby power supply part and the main power supply part and used for providing a working power supply for the surge protection device by utilizing the main power supply or the standby power supply.

10. A method of surge protection, the method comprising:

detecting a total power supply provided by a power supply, and determining whether the total power supply has a surge signal exceeding a preset threshold value;

under the condition that the main power supply has a surge signal exceeding a preset threshold value, controlling a standby power supply part to supply power to electric equipment;

and controlling the main power supply part to supply power to the electric equipment when the main power supply does not have the surge signal exceeding the preset threshold.

11. An appliance device, the device comprising:

a power supply for supplying a main power using an external power;

the main power supply part can be connected with the power supply and is used for inputting the total power supply and generating a main power supply for supplying power to electric equipment; and

the surge protection device of any of claims 1 to 9.

Images