CN116470469A - Electronic device, protection circuit and protection method using same - Google Patents

Electronic device, protection circuit and protection method using same Download PDF

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Publication number
CN116470469A
CN116470469A CN202210033196.9A CN202210033196A CN116470469A CN 116470469 A CN116470469 A CN 116470469A CN 202210033196 A CN202210033196 A CN 202210033196A CN 116470469 A CN116470469 A CN 116470469A
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CN
China
Prior art keywords
voltage
coupled
unit
filtering
resistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210033196.9A
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Chinese (zh)
Inventor
林威廷
江翰儒
陈志泰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lite On Technology Corp
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Lite On Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lite On Technology Corp filed Critical Lite On Technology Corp
Priority to CN202210033196.9A priority Critical patent/CN116470469A/en
Publication of CN116470469A publication Critical patent/CN116470469A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1203—Circuits independent of the type of conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
    • H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses a protection circuit which comprises an auxiliary coil, a rectifying unit, a filtering unit, a voltage dividing unit and a controller. The auxiliary coil is used for inducing alternating voltage. The rectification unit is coupled with the auxiliary coil and used for rectifying the alternating voltage into direct voltage. The filtering unit is coupled to the rectifying unit and used for filtering the direct current voltage into direct current filtering voltage. The voltage dividing unit is coupled to the rectifying unit and the filtering unit for transmitting the DC filtering voltage. The controller is coupled to the voltage dividing unit and used for detecting the voltage division of the direct current filtering voltage and judging whether to start a protection mechanism according to the voltage division.

Description

Electronic device, protection circuit and protection method using same
Technical Field
The invention relates to an electronic device, a protection circuit and a protection method using the same.
Background
Most of the existing power supplies use a boost type high Voltage converter to provide a Power Factor Correction (PFC) function, and the boosted large capacitance Voltage (Bulk Voltage) belongs to a high Voltage (between 300 volts and 450 volts). However, when feedback is abnormal, the voltage is often raised too high, so that the large capacitor is damaged. Therefore, there is a need to propose a protection circuit with overvoltage protection.
Disclosure of Invention
The embodiment of the invention provides an electronic device, a protection circuit and a protection method using the same, which can improve the problems.
An embodiment of the invention provides an electronic device. The electronic device comprises a protection circuit and a controller. The protection circuit comprises an auxiliary coil, a rectifying unit, a filtering unit and a voltage dividing unit. The auxiliary coil is used for inducing an alternating voltage. The rectifying unit is coupled to the auxiliary coil and used for rectifying the alternating voltage into a direct voltage. The filtering unit is coupled to the rectifying unit and used for filtering the direct current voltage into a direct current filtering voltage. The voltage dividing unit is coupled to the rectifying unit and the filtering unit for transmitting the DC filtering voltage. The controller is coupled to the voltage dividing unit and used for detecting a voltage division of the DC filtered voltage and judging whether to start an overvoltage protection mode or an undervoltage protection mode according to the voltage division.
An embodiment of the present invention provides a protection method. The protection method comprises the following steps: an auxiliary coil induces an alternating voltage; a rectifying unit rectifies the alternating voltage into a direct voltage; a filtering unit filters the direct current voltage into direct current filtering voltage; a controller detects a partial voltage of the DC filtered voltage transmitted to a voltage dividing unit; and the controller judges whether to start an overvoltage protection mode or an undervoltage protection mode according to the voltage division.
Another embodiment of the present invention provides a protection circuit. The protection circuit is electrically coupled to a controller. The protection circuit comprises an auxiliary coil, a rectifying unit, a filtering unit and a voltage dividing unit. The auxiliary coil is used for inducing an alternating voltage. The rectifying unit is coupled to the auxiliary coil and used for rectifying the alternating voltage into a direct voltage. The filtering unit is coupled to the rectifying unit and used for filtering the direct current voltage into a direct current filtering voltage. The voltage dividing unit is coupled to the rectifying unit and the filtering unit for transmitting the DC filtering voltage. A voltage division of the DC filtered voltage is used for the controller to judge whether to start an overvoltage protection mode or an undervoltage protection mode.
For a better understanding of the above and other aspects of the invention, reference will now be made in detail to the following examples, examples of which are illustrated in the accompanying drawings.
Drawings
FIG. 1 is a functional block diagram of an electronic device according to an embodiment of the invention.
Fig. 2 is a partial circuit diagram of an electronic device according to an embodiment of the invention.
Fig. 3 is a partial circuit diagram of an electronic device according to another embodiment of the invention.
Fig. 4 is a flowchart of a protection method of the electronic device of fig. 1.
Wherein, the reference numerals:
10,20 electronic device
11 AC power supply
12 rectifier
13 high voltage converter
14,24 transformer
15 controller
15a detection end
16 control circuit
100,200 protection circuit
110 auxiliary coil
120 rectifying unit
121 diode
121a,131a,141a,142a, one end
121b,131b,141b,142b, the other end
130 filtering unit
131 capacitor
140 partial pressure unit
141 first resistor
142 second resistor
d, f, node
L1 load
GND ground potential
N P The number of turns of the main winding
N 110 Auxiliary winding turns
Ra, rb feedback resistor
R 141 ,R 142 Resistance value
S110-S180 steps
V AC Ac voltage
V BULK High voltage
V D1 Forward turn-on voltage
V DC DC voltage
V DCF DC filtered voltage
V d Partial pressure
V i Ac voltage
V R Rectified voltage
V S Voltage set point
W A Auxiliary coil
W P Main coil
Detailed Description
For a better understanding of the above and other aspects of the invention, reference will now be made in detail to the following examples, examples of which are illustrated in the accompanying drawings.
Referring to fig. 1-2, fig. 1 is a functional block diagram of an electronic device 10 according to an embodiment of the invention, and fig. 2 is a partial circuit diagram of the electronic device 10 according to an embodiment of the invention.
As shown in fig. 1, the electronic device 10 includes a rectifier 12, a high voltage converter 13, a transformation converter 14, a controller 15, and a protection circuit 100 (the protection circuit 100 is shown in fig. 2). The controller 15 is, for example, digital signal processing (digital signal process, DSP). The electronic device 10 is illustrated as a power supply, which uses a Flyback transformer, so the transformer 14 is a Flyback converter. The rectifier 12, the high voltage converter 13, the transformer 14 and/or the controller 15 are, for example, solid circuits (circuits) formed by using semiconductor processes.
As shown in fig. 1, an ac power supply 11 is used for providing an ac voltage V i For the electronic device 10, the rectifier 12 is used for converting the alternating voltage V i Conversion to rectified voltage V R The high voltage converter 13 is used for rectifying the voltage V R Conversion to high voltage V BULK . High voltage V BULK Through pressure transformationThe converter 14 converts to an appropriate operating voltage (voltage transformation) and outputs the voltage to the load L1. As shown in fig. 1 and 2, the high voltage converter 13 includes, for example, feedback resistors Ra and Rb. The transformer 14 further includes a Primary Winding (W) P Auxiliary coil (Auxiliary Winding) W A . Main coil W P And auxiliary coil W A For example a primary side coil. When immediate abnormality occurs in the feedback resistors Ra and Rb (for example, the feedback resistor Ra is open or the feedback resistor Rb is short), the high voltage V BULK The overvoltage problem occurs due to the immediate rise. However, the protection circuit 100 can determine the high voltage V BULK Whether or not to be abnormal and when the voltage is high V BULK When an abnormality occurs, the protection circuit 100 activates a protection mechanism. For example, the protection circuit 100 controls the high voltage converter 13 via the control line 16 to activate the protection mechanism. The structure of the protection circuit 100 is further described below.
As shown in fig. 2, the protection circuit 100 includes an auxiliary coil 110, a rectifying unit 120, a filtering unit 130, and a voltage dividing unit 140. The rectifying unit 120, the filtering unit 130 and/or the voltage dividing unit 140 are, for example, solid circuits formed by semiconductor manufacturing processes. The protection circuit 100 may be formed, configured, or integrated with the transformer 14 and/or the high voltage converter 13. For example, one or some of all elements of the protection circuit 100 may be formed, configured, or integrated with the high voltage converter 13, while another one or others may be formed, configured, or integrated with the voltage transformation converter 14. In an embodiment, the auxiliary coil 110, the rectifying unit 120 and the filtering unit 130 may be formed, configured or integrated with the transformer 14, and the voltage dividing unit 140 may be formed, configured or integrated with the high voltage converter 13. Further, the auxiliary coil 110 may be the aforementioned auxiliary coil W A At least a portion of (a); alternatively, the auxiliary coil 110 and the auxiliary coil W A Is two separate elements, wherein the auxiliary coil 110 is connected to the auxiliary coil W A 。
As shown in fig. 2, a main coil W is utilized P And auxiliary coil W A The ratio of the winding (voltage) to the high voltage V can be obtained BULK Proportional alternating voltage (low voltage) V AC . The auxiliary coil 110 is used for inducing an alternating voltage V AC . Rectifying unit 120 are coupled to the auxiliary coil 110 for supplying an alternating voltage V AC Rectifying to a DC voltage V DC (not labeled). The filter unit 130 is coupled to the rectifying unit 120 and is used for converting the DC voltage V DC Filtering to obtain a DC filtered voltage V DCF . The voltage dividing unit 140 is coupled to the rectifying unit 120 and the filtering unit 130 for transmitting the DC filtered voltage V DCF . The controller 15 is coupled to the voltage dividing unit 140 and is used for detecting the DC filtered voltage V DCF Is of the partial pressure V of d According to partial pressure V d And judging whether to start a protection mechanism.
In other words, the alternating voltage V induced by the auxiliary coil 110 AC Rectifying and filtering the voltage into a DC filtered voltage V by a rectifying unit 120 and a filtering unit 130 DCF And obtains the partial pressure V through the partial pressure unit 140 d . The controller 15 is based on the partial pressure V d And (3) determines whether to activate the protection mechanism and the type of protection mechanism activated.
As shown in fig. 2, in the present embodiment, the rectifying unit 120 includes a diode 121, one end (e.g., one end) 121a of the diode 121 is coupled to the auxiliary coil 110, and the other end (e.g., the other end) 121b of the diode 121 is coupled to the filtering unit 130. The filter unit 130 includes a capacitor 131, one end 131a of the capacitor 131 is coupled to the rectifying unit 120, and the other end 131b of the capacitor 131 is coupled to the ground potential GND. One end 131a of the capacitor 131 is, for example, a line coupled between the other end 121b of the diode 121 and the voltage dividing unit 140. The voltage dividing unit 140 includes a first resistor 141 and a second resistor 142 coupled to each other, and the first resistor 141 is coupled to the rectifying unit 120 and the filtering unit 130. The first resistor 141 has one end 141a and the other end 141b. In the present embodiment, one end 141a, the other end 121b and one end 131a are coupled to a (common point) node f, the voltage of which is the DC filtered voltage V DCF . The second resistor 142 is coupled to the ground potential GND. For example, the second resistor 142 has one end 142a and another end 142b, wherein the one end 142a is coupled to the other end 141b of the first resistor 141, and the other end 142b is coupled to the ground potential GND.
The structure and/or connection relationship of the rectifying unit 120, the filtering unit 130 and/or the voltage dividing unit 140 in the embodiment of the present invention are not limited to the above, and may include other types of circuit structures, as long as the functions required by the present invention can be achieved.
As shown in FIG. 2, the partial pressure V d For example, the voltage at a node d between the first resistor 141 and the second resistor 142. The controller 15 is used for detecting the partial pressure V d And judging whether to start the protection mechanism according to the protection information. The protection mechanism includes, for example, an overvoltage protection mode or an undervoltage protection mode.
In the overvoltage protection mode, the controller 15 is further configured to: determining the partial pressure V d Whether or not it is equal to or greater than a first set voltage value; and when the partial pressure V d And when the voltage is equal to or greater than the first set voltage value, starting an overvoltage protection mode. In the undervoltage protection mode, the controller 15 is further configured to: determining the partial pressure V d Whether the voltage value is equal to or smaller than a second set voltage value; and when the partial pressure V d And when the voltage is equal to or smaller than the second set voltage value, starting an undervoltage protection mode.
The manner in which the first set voltage value is generated (or obtained) is described below.
Formula (1), V S Representing the voltage set point, R, at the sense terminal 15a of the controller 15 141 Represents the resistance value of the first resistor 141, R 142 Represents the resistance value of the second resistor 142, V D1 Represents the forward turn-on voltage, N, of diode 121 P Representing the main coil W P The number of turns of the main winding, N 110 Indicating the number of auxiliary windings of the auxiliary coil 110. Resistance value R 141 Resistance value R 142 Number of turns of main winding N P Number of windings N 110 High voltage V BULK To know, substituting the known values into formula (1) to obtain corresponding voltage set value V S 。
In overvoltage protection mode, high voltage V BULK At 481.5 volts (V), resistance R 141 At 30 Kohm, resistance value R 142 With 4.99K ohm, main windingNumber of turns N P With 62 turns to assist the number of windings N 110 Substituting 3 turns into the voltage set point V (1) to obtain the corresponding voltage set point V S 3.18V, which is the first set voltage value. When the controller 15 detects the partial pressure V through the detection end 15a d When 3.18V is reached, the controller 15 may initiate an overvoltage protection mode. For example, as shown in fig. 1, the controller 15 cuts off the high voltage converter 13 through the control line 16, and immediately turns off the high voltage converter 13 (stops supplying the voltage to the voltage-converting converter 14), to achieve the technical effect of overvoltage protection.
In the undervoltage protection mode, only the high voltage V is changed BULK For example, 250 volts (V), the other parameter values are unchanged, and the corresponding voltage set value V can be obtained after the operation of the substitution formula (1) S 1.58V, which is the second set voltage value. When the controller 15 detects the partial pressure V through the detection end 15a d When 1.58V is reached, the undervoltage protection mode is activated. For example, as shown in fig. 1, the controller 15 cuts off the high voltage converter 13 through the control line 16, and immediately turns off the high voltage converter 13 (stops supplying the voltage to the voltage transformation converter 14), so as to achieve the technical effect of undervoltage protection.
Referring to fig. 3, a partial circuit diagram of an electronic device 20 according to another embodiment of the invention is shown. The electronic device 20 includes a rectifier 12 (not shown), a high voltage converter 13, a transformation converter 24, a controller 15, and a protection circuit 200. The protection circuit 200 includes an auxiliary coil 110, a rectifying unit 120, a filtering unit 130, and a voltage dividing unit 140. The protection circuit 200 of the present embodiment has the same or similar features as the protection circuit 100 described above, and will not be described again. In the present embodiment, the electronic device 20 is exemplified by using a Forward transformer, so the transformer converter 24 is a Forward converter.
In addition, the protection circuit 100 or 200 can be applied to other transformer converters in other transformer modes, which is not limited by the embodiment of the present invention.
Referring to fig. 4, a flowchart of a protection method of the electronic device 10 of fig. 1 is shown. The protection method may be applied to the protection circuit 100 of fig. 2 or the protection circuit 200 implementation of fig. 3.
In step S110, the auxiliary coil 110 induces an ac voltage V AC 。
In step S120, the rectifying unit 120 rectifies the ac voltage V AC Rectifying to DC voltage V DC (not shown).
In step S130, the filtering unit 130 outputs a dc voltage V DC Filtering to obtain DC filtered voltage V DCF 。
In step S140, the controller 15 is configured to detect the dc filtered voltage V DCF Is of the partial pressure V of d 。
In step S150, the controller 15 determines the partial pressure V d Whether equal to or greater than a first set voltage value. When the partial pressure V d When the voltage value is equal to or greater than the first set voltage value, the flow proceeds to step S160, where the overvoltage protection mode is started. When the partial pressure V d When not equal to or greater than the first set voltage value, the flow advances to step S170.
In step S170, the controller 15 determines the partial pressure V d Whether or not to be equal to or smaller than the second set voltage value. When the partial pressure V d When the voltage value is equal to or smaller than the second set voltage value, the flow proceeds to step S180, and the undervoltage protection mode is started. When the partial pressure V d When not equal to or not less than the second set voltage value, the controller 15 maintains the current operation mode, i.e. does not activate the protection mechanism. The first set voltage value is larger than the second set voltage value.
In summary, although the present invention has been described in terms of the above embodiments, it is not limited thereto. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.

Claims (18)

1. An electronic device, comprising:
a protection circuit, comprising:
an auxiliary coil for inducing an alternating voltage;
a rectifying unit coupled to the auxiliary coil for rectifying the AC voltage into a DC voltage;
the filtering unit is coupled with the rectifying unit and used for filtering the direct-current voltage into direct-current filtering voltage; a kind of electronic device with high-pressure air-conditioning system
The voltage dividing unit is coupled to the rectifying unit and the filtering unit to transmit the direct current filtering voltage; and
a controller coupled to the voltage dividing unit and configured to:
detecting a partial voltage of the DC filtering voltage; a kind of electronic device with high-pressure air-conditioning system
And judging whether an overvoltage protection mode or an undervoltage protection mode is started according to the voltage division.
2. The electronic device of claim 1, wherein the controller is further configured to:
judging whether the partial voltage is equal to or larger than a first set voltage value; and
when the divided voltage is equal to or greater than the first set voltage value, the overvoltage protection mode is started.
3. The electronic device of claim 1, wherein the controller is further configured to:
judging whether the partial voltage is equal to or smaller than a second set voltage value;
and when the partial voltage is equal to or smaller than the second set voltage value, starting the undervoltage protection mode.
4. The electronic device of claim 1, wherein the voltage dividing unit comprises a first resistor and a second resistor coupled to each other, the first resistor is coupled to the rectifying unit and the filtering unit, the second resistor is coupled to a ground potential, and the controller is further configured to:
the voltage division of a node between the first resistor and the second resistor is detected.
5. The electronic device of claim 1, wherein the rectifying unit comprises a diode, one end of the diode is coupled to the auxiliary winding, and the other end of the diode is coupled to the filtering unit.
6. The electronic device of claim 1, wherein the filter unit comprises a capacitor, one end of the capacitor is coupled to the rectifying unit, and the other end of the capacitor is coupled to a ground potential.
7. A method of protection, comprising:
an auxiliary coil induces an alternating voltage;
a rectifying unit rectifies the alternating voltage into a direct voltage;
a filtering unit filters the direct current voltage into direct current filtering voltage;
a controller detects a divided voltage of the DC filtered voltage transmitted to a voltage dividing unit; and
the controller judges whether to start an overvoltage protection mode or an undervoltage protection mode according to the voltage division.
8. The protection method of claim 7, further comprising:
judging whether the partial voltage is equal to or larger than a first set voltage value; and
when the divided voltage is equal to or greater than the first set voltage value, the overvoltage protection mode is started.
9. The protection method of claim 7, further comprising:
judging whether the partial voltage is equal to or smaller than a second set voltage value;
and when the partial voltage is equal to or smaller than the second set voltage value, starting the undervoltage protection mode.
10. The protection method of claim 7, wherein the voltage dividing unit comprises a first resistor and a second resistor coupled to each other, the first resistor is coupled to the rectifying unit and the filtering unit, and the second resistor is coupled to a ground potential, the protection method further comprising:
the voltage division of a node between the first resistor and the second resistor is detected.
11. The protection method of claim 7, wherein the rectifying unit comprises a diode, one end of the diode is coupled to the auxiliary winding, and the other end of the diode is coupled to the filtering unit.
12. The protection method of claim 7, wherein the filter unit comprises a capacitor, one end of the capacitor is coupled to the rectifying unit, and the other end of the capacitor is coupled to a ground potential.
13. A protection circuit, electrically coupled to a controller, comprising:
an auxiliary coil for inducing an alternating voltage;
an auxiliary coil for inducing an alternating voltage;
a rectifying unit coupled to the auxiliary coil for rectifying the AC voltage into a DC voltage;
the filtering unit is coupled with the rectifying unit and used for filtering the direct-current voltage into direct-current filtering voltage; and
the voltage dividing unit is coupled to the rectifying unit and the filtering unit to transmit the direct current filtering voltage;
the controller is used for judging whether to start an overvoltage protection mode or an undervoltage protection mode or not by using a partial voltage of the direct current filtering voltage.
14. The protection circuit of claim 13, wherein the controller initiates the overvoltage protection mode when the divided voltage is equal to or greater than a first set voltage value.
15. The protection circuit of claim 13, wherein the controller initiates the undervoltage protection mode when the divided voltage is equal to or less than a second set voltage value.
16. The protection circuit of claim 13, wherein the voltage divider comprises a first resistor and a second resistor coupled to each other, the first resistor is coupled to the rectifying unit and the filtering unit, and the second resistor is coupled to a ground potential; the voltage division is the voltage of a node between the first resistor and the second resistor.
17. The protection circuit of claim 13, wherein the rectifying unit comprises a diode, one end of the diode is coupled to the auxiliary winding, and the other end of the diode is coupled to the filtering unit.
18. The protection circuit of claim 13, wherein the filter unit comprises a capacitor, one end of the capacitor is coupled to the rectifying unit, and the other end of the capacitor is coupled to a ground potential.
CN202210033196.9A 2022-01-12 2022-01-12 Electronic device, protection circuit and protection method using same Pending CN116470469A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210033196.9A CN116470469A (en) 2022-01-12 2022-01-12 Electronic device, protection circuit and protection method using same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210033196.9A CN116470469A (en) 2022-01-12 2022-01-12 Electronic device, protection circuit and protection method using same

Publications (1)

Publication Number Publication Date
CN116470469A true CN116470469A (en) 2023-07-21

Family

ID=87182998

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210033196.9A Pending CN116470469A (en) 2022-01-12 2022-01-12 Electronic device, protection circuit and protection method using same

Country Status (1)

Country Link
CN (1) CN116470469A (en)

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