CN115207876A - Overvoltage protection circuit, method and power supply system - Google Patents
Overvoltage protection circuit, method and power supply system Download PDFInfo
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- CN115207876A CN115207876A CN202210971598.3A CN202210971598A CN115207876A CN 115207876 A CN115207876 A CN 115207876A CN 202210971598 A CN202210971598 A CN 202210971598A CN 115207876 A CN115207876 A CN 115207876A
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- thyristor
- power supply
- overvoltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- 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
- H02H7/18—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 batteries; for accumulators
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Abstract
The application discloses overvoltage protection circuit, method and electrical power generating system, overvoltage protection circuit includes: the voltage monitoring circuit is used for outputting a thyristor gating signal to the thyristor when the overvoltage of the voltage detection point is detected, and the thyristor gating signal is used for controlling the conduction of the thyristor; the first resistor and the second resistor are connected in series between the direct current power supply end and the power supply end of the power supply control chip, and the direct current power supply end is used for providing maintaining current for the thyristor when the thyristor is conducted so as to ensure reliable conduction of the thyristor; the cathode of the thyristor is grounded, and the anode of the thyristor is connected to the midpoint of the first resistor and the second resistor; the first end of the energy storage module is grounded, the second end of the energy storage module is connected with the middle point of the first resistor and the second resistor, and the energy storage module is used for discharging through the thyristor when the thyristor is reliably conducted and cutting off the power supply output of the power supply control chip. This application technical scheme can reliably cut off circuit system's power supply output when overvoltage to promote the life of circuit system inner part.
Description
Technical Field
The present disclosure relates to the field of circuit safety technologies, and in particular, to an overvoltage protection circuit, method and power supply system.
Background
When the overvoltage crowbar appears in present circuit system, make the system get into the safe state through overvoltage crowbar usually, overvoltage crowbar commonly used generally adopts comparator + MOS pipe control safety system safety relevant voltage, when the system is excessive pressure, the comparator action, trigger safety monitoring link such as MOS pipe, cut off the system power source, maintain system voltage in the safe voltage range, but switching power supply is mostly flyback power, overvoltage crowbar action back, can cut off flyback power control chip power usually, power supply system can get into the hiccup state this moment, and the hiccup state can lead to circuit system to go up repeatedly, carry out the repeated impact to the circuit system inner part, influence the life of circuit system inner part.
Disclosure of Invention
The main object of the present application is to provide an overvoltage protection circuit, which is intended to reliably cut off the power supply output of a circuit system in case of overvoltage, so as to improve the service life of components in the circuit system.
To achieve the above object, the present application proposes an overvoltage protection circuit, which includes:
the voltage monitoring circuit is used for outputting a thyristor gating signal to the thyristor when detecting that the voltage detection point is overvoltage, and the thyristor gating signal is used for controlling the thyristor to be conducted;
the thyristor protection circuit comprises a first resistor and a second resistor, wherein the first resistor and the second resistor are connected in series between a direct current power supply end and a power supply end of a power supply control chip, and the direct current power supply end is used for providing a holding current for the thyristor when the thyristor is conducted so as to ensure that the thyristor is conducted reliably;
the cathode of the thyristor is grounded, and the anode of the thyristor is connected to the midpoint of the first resistor and the second resistor;
the first end of the energy storage module is grounded, the second end of the energy storage module is connected with the middle point of the first resistor and the middle point of the second resistor, and the energy storage module is used for discharging through the thyristor when the thyristor is switched on so as to cut off the power supply output of the power supply end of the power supply control chip.
Optionally, the energy storage module comprises a diode and an energy storage unit,
the first end of the energy storage unit is grounded, and the second end of the energy storage unit is connected with the anode of the diode and the power supply end of the power supply control chip;
and the cathode of the diode is connected to the midpoint of the first resistor and the second resistor.
Optionally, when the thyristor is reliably turned on, the energy storage unit is configured to discharge through the thyristor and the diode; and when the thyristor is not reliably conducted, the energy storage unit is used for outputting energy storage based on the power supply of the power supply end of the power supply control chip.
Optionally, the voltage monitoring circuit comprises an overvoltage detection circuit and an optical coupler,
the overvoltage detection circuit is used for outputting an optical coupler control signal to the optical coupler when detecting that the voltage detection point is overvoltage, wherein the optical coupler control signal is a low-level signal;
the optocoupler is used for conducting when receiving the optocoupler control signal and outputting the thyristor gating signal to the thyristor, wherein the thyristor gating signal is a high-level signal.
Optionally, the over-voltage detection circuit comprises a comparator and a reference power supply,
the over-voltage detection circuit comprises a comparator and a reference power supply,
the reference power supply is used for outputting a reference voltage signal to the comparator;
the negative input end of the comparator is connected with the voltage detection point, the positive input end of the comparator is connected with the output end of the reference power supply, the output end of the comparator is connected with the optocoupler, the comparator is used for comparing the voltage signal of the voltage detection point with the reference voltage signal, and the optocoupler control signal is generated when the voltage detection point is determined to be overvoltage.
In order to achieve the above object, the present application further provides an overvoltage protection circuit method, applied to the above overvoltage protection circuit, where the overvoltage protection method includes:
when detecting that the voltage detection point is overvoltage, outputting a thyristor gating signal to a thyristor, wherein the thyristor gating signal is used for controlling the thyristor to be conducted;
providing a maintaining current for the thyristor through a direct current power supply end, wherein the maintaining current is used for maintaining the thyristor to be reliably conducted;
and when the thyristor is reliably conducted, cutting off the power supply output of the power supply end of the power supply control chip.
Optionally, the energy storage module includes a diode and an energy storage unit, and the overvoltage protection method further includes:
when the thyristor is reliably conducted, the energy storage unit is controlled to discharge through the diode and the thyristor, and the power supply output of the power supply end of the power supply control chip is cut off;
and when the thyristor is not reliably conducted, the energy storage unit is charged by the power supply output of the power supply end of the power supply control chip.
Optionally, the voltage monitoring circuit includes an overvoltage detection circuit and an optocoupler, and when detecting that the voltage detection point is overvoltage, the voltage monitoring circuit outputs a thyristor gating signal to the thyristor, including:
if the overvoltage detection circuit detects that the voltage detection point is overvoltage, an optical coupler control signal is output to the optical coupler through the overvoltage detection circuit, wherein the optical coupler control signal is a low-level signal;
and controlling the optocoupler to be conducted according to the optocoupler control signal to generate the thyristor gating signal, wherein the thyristor gating signal is a high-level signal.
Optionally, the overvoltage detection circuit includes a comparator and a reference power supply, and if the overvoltage detection circuit detects that the voltage detection point is overvoltage, the overvoltage detection circuit outputs an optocoupler control signal to the optocoupler, including:
acquiring a voltage signal generated by the voltage detection point and a reference voltage signal output by the reference power supply;
when the voltage detection point is determined to be overvoltage, the voltage signal and the reference voltage signal are compared through the comparator, and the optical coupler control signal is generated;
and outputting an optical coupling control signal to the optical coupler through the comparator.
In order to achieve the above object, the present application further provides a power supply system, where the step motor driver includes the above overvoltage protection circuit, which is specifically referred to above and is not described herein again.
This application technical scheme has constituteed overvoltage crowbar through setting up voltage monitoring circuit, first resistance and second resistance, thyristor and energy storage module, in this overvoltage crowbar, first resistance with second resistance series connection is between the supply terminal of direct current supply end and power control chip, the negative pole ground connection of thyristor, the positive pole of thyristor connect in first resistance with the midpoint of second resistance, the first end ground connection of energy storage module, the second end connection of energy storage module first resistance with the midpoint of second resistance to voltage monitoring circuit can be to thyristor output thyristor gate control signal, control when detecting voltage detection point overvoltage the thyristor switches on, and the thyristor switches on the back, the energy storage module can the thyristor can pass through the thyristor discharges, and draw down fast first resistance with the potential of midpoint of second resistance, thereby realizes cutting off the purpose of the power supply output of power control chip's supply terminal, and direct current supply terminal can for the maintenance current is provided, maintains the internal part reliably switches on, consequently the power control chip's supply terminal can last power control chip's supply terminal reliably maintain the status, hiccup the safe state of circuit system and the hiccup in the circumstances of the shock has consequently appeared, the circuit system has avoided the repeated life-off.
Drawings
In order to more clearly illustrate the embodiments of the present application 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 application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of an over-voltage protection circuit according to the present application;
fig. 2 is a functional block diagram of an embodiment of an overvoltage protection circuit when an energy storage module of the present application is composed of a diode and an energy storage unit;
fig. 3 is a circuit functional block diagram of an embodiment of an overvoltage protection circuit when the voltage monitoring circuit is composed of an overvoltage detection circuit and an optocoupler in the present application;
FIG. 4 is a schematic circuit diagram of a voltage monitoring circuit according to an embodiment of the overvoltage protection circuit of the present application;
fig. 5 is a schematic circuit diagram of an overvoltage shutdown circuit according to an embodiment of the overvoltage protection circuit of the present application;
fig. 6 is a flowchart of an embodiment of the overvoltage protection method of the present application.
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
The reference numbers illustrate:
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the present embodiment are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions referred to as "first", "second", etc. in this application are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
In an embodiment of the present application, the overvoltage protection circuit includes a voltage monitoring circuit 100, a first resistor R1 and a second resistor R2, a thyristor T1, and an energy storage module 200.
Referring to fig. 1, in this embodiment, the overvoltage protection circuit is composed of a voltage monitoring circuit 100 and an overvoltage cutoff circuit, where the overvoltage cutoff circuit includes a first resistor R1 and a second resistor R2, a thyristor T1 and an energy storage module 200, an input end of the voltage monitoring circuit 100 is connected to a voltage detection point, and an output end of the voltage monitoring circuit 100 is connected to a gate of the thyristor T1; the first resistor R1 and the second resistor R2 are connected in series, one end of the first resistor R1 is connected with a direct current power supply end, the other end of the first resistor R1 is connected with the second resistor R2, one end of the second resistor R2 is connected with a power supply end of a power supply control chip, and the other end of the second resistor R2 is connected with the first resistor R1; the cathode of the thyristor T1 is grounded, and the anode of the thyristor T1 is connected to the midpoint of the first resistor R1 and the second resistor R2; the first end of the energy storage module 200 is grounded, and the second end of the energy storage module 200 is connected to the midpoint of the first resistor R1 and the second resistor R2.
When detecting that the voltage detection point is overvoltage, the voltage monitoring circuit 100 generates a thyristor gate control signal according to a voltage signal generated by the voltage detection point, outputs the thyristor gate control signal to the gate of the thyristor T1, and controls the conduction of the anode and the cathode of the thyristor T1, wherein the thyristor gate control signal is used for controlling the conduction of the thyristor T1; when the thyristor T1 is turned on, the energy storage module 200 discharges through the thyristor T1, so that the potential at the midpoint between the first resistor R1 and the second resistor R2 can be quickly pulled down, that is, pulled down from a high level to a low level, so that the power supply end of the power supply control chip can be pulled down to the low level, the power supply output of the power supply end of the power supply control chip is cut off, and meanwhile, the direct current power supply end provides a maintaining current for the thyristor T1 through the first resistor R1, and the maintaining current can maintain the thyristor T1 to be continuously in a conducting state, thereby ensuring that the thyristor T1 is reliably conducted; wherein, because thyristor T1 reliably switches on, consequently power control chip's supply terminal can last stably at the low level, can ensure that electrical power generating system can not get into the hiccup state, and this electrical power generating system can be servo electrical power generating system.
As an example, before the thyristor T1 is turned off, the power supply terminal of the power control chip supplies power to the energy storage module 200, the energy storage module 200 stores energy under the power supply output of the power supply terminal of the power control chip,
as an example, referring to fig. 2, the energy storage module 200 includes a diode D1 and an energy storage unit 201, a first end of the energy storage unit 201 is grounded, and a second end of the energy storage unit 201 is connected to an anode of the diode D1 and a power supply end of a power supply control chip; the cathode of the diode D1 is connected to the midpoint between the first resistor R1 and the second resistor R2. The diode D1 is used for ensuring that a path cannot be formed between a direct current power supply end and the energy storage unit 201, when the thyristor T1 is reliably conducted, the energy storage unit 201 is unidirectionally conducted to the thyristor T1, and the energy storage unit 201 discharges through the diode D1 and the thyristor T1, so that the potential at the midpoint of the first resistor R1 and the second resistor R2 can be quickly pulled down, namely, pulled down from a high level to a low level, and the power supply end of the power supply control chip can be pulled down to a low level; before the thyristor T1 is reliably turned on, a path is formed between the power supply end of the power control chip and the energy storage unit 201, and the energy storage unit 201 stores energy under the power supply output of the power supply end of the power control chip.
As an example, referring to fig. 3, the voltage monitoring circuit 100 includes an overvoltage detection circuit 101 and an optical coupler U2, where the overvoltage detection circuit 101 is configured to generate a corresponding optical coupler control signal according to a voltage signal of a voltage detection point when detecting that an overvoltage occurs at the voltage detection point, and output the optical coupler control signal to the optical coupler U2; and the optocoupler U2 is used for outputting the thyristor gating signal to the thyristor T1 when receiving the optocoupler control signal, wherein the optocoupler control signal is used for controlling the switch-on of the optocoupler U2. The optocoupler control signal may be a low level signal, and the thyristor gating signal may be a high level signal.
As an example, the optical coupling control signal may be a low level signal, the overvoltage detection circuit 101 includes a comparator U1 and a reference power source VREF, referring to fig. 4, fig. 4 is a schematic circuit structure diagram of the voltage monitoring module 100, and the reference power source VREF is used for outputting a reference voltage signal to the comparator U1; the negative input end of the comparator U1 is connected with the voltage detection point, the positive input end of the comparator U1 is connected with the output end of the reference power source VREF, the output end of the comparator U1 is connected with the negative electrode of the diode D2, and the positive electrode of the diode D2 is connected with the input end of the optocoupler U2; when confirming voltage detection point excessive pressure, voltage signal and reference voltage signal that produce the voltage detection point through comparator U1 compare, can produce high level signal, diode D2 can not switch on this moment, high level signal can not transmit to opto-coupler U2, when voltage detection point is excessive pressure, voltage signal and reference voltage signal that produce the voltage detection point through comparator U1 compare, can produce low level signal, diode D2 can switch on this moment, low level signal can regard as opto-coupler control signal transmission to opto-coupler U2, then can switch on after this low level signal is received to opto-coupler U2, then can export thyristor gate control signal Ug to thyristor T1 after opto-coupler U2 switches on.
As an example, the voltage of the voltage detection point fluctuates between 0 and 5V, the reference power supply voltage VREF is 1.2V, if the voltage exceeds 5V, the comparator U1 compares a voltage signal generated by the voltage detection point with a reference voltage signal, and since the voltage signal is greater than 5V, the comparator U1 outputs a low level signal at a point a, and the low level signal is transmitted to the optocoupler U2 through the diode D2 to control the optocoupler U2 to be turned on, so as to generate a thyristor gating signal Ug; if the voltage does not exceed 5V, the comparator U1 compares a voltage signal generated by the voltage detection point with a reference voltage signal, and because the normal voltage signal is not greater than 5V, the comparator U1 can output a high level signal at the point A, and the high level signal can be blocked by the diode D2, so that the conduction of the optocoupler U2 cannot be controlled.
As an example, referring to fig. 4 and 5, fig. 5 is a schematic structural diagram of an overvoltage cutoff circuit in an embodiment of the present application, an energy storage unit 201 is formed by connecting an energy storage capacitor C1, a diode D3, a resistor R5 and a heat sink in series, one end of the energy storage capacitor C1 is grounded, the other end of the energy storage capacitor C1 is connected to the anode of the diode D1 and the power supply terminal VCC of the power control chip U43, the cathode of the diode D1 is connected to the midpoint B of the first resistor R1 and the second resistor R2, the anode of the thyristor T1 is connected to the midpoint B of the first resistor R1 and the second resistor R2, the cathode of the thyristor T1 is grounded, the gate of the thyristor T1 is connected to the output end of the optocoupler U2, and the voltage monitoring circuit 100 outputs a thyristor gate control signal Ug to the gate of the thyristor T1 during overvoltage. One end of the first resistor R1 is connected with the direct current power supply end VIN 310VDC/540V DC, the other point of the first resistor R1 is connected with one end of the second resistor R2, the other end of the second resistor R2 is connected with the power supply end VCC of the power supply control chip U43, so that after the thyristor T1 is switched on, the energy storage capacitor C1 is changed from a charging state to a discharging state, the energy storage capacitor C1 discharges through the diode D1 and the thyristor T1, the potential of the point B can be rapidly pulled down, namely the point B is rapidly pulled down to a low level from a high level, the power supply end VCC of the power supply control chip U43 is in a low level, the power supply output of the power supply end VCC of the power supply control chip U43 can be cut off, meanwhile, after the thyristor T1 is switched on, the direct current power supply end VIN 310/540V DC can provide a maintaining current for the thyristor T1 through the first resistor R1, the maintaining current can maintain the thyristor T1 to be in a continuous conducting state, the reliable conduction of the thyristor T1 is realized, the power supply end VCC of the power supply control chip U43 is in a low level, and the power supply output of the thyristor T43 is reliably cut off.
According to the technical scheme, the overvoltage protection circuit is formed by arranging the voltage monitoring circuit, the first resistor, the second resistor, the thyristor and the energy storage module, the overvoltage protection circuit is characterized in that the first resistor, the second resistor, the thyristor and the energy storage module are connected in series between the direct current power supply end and the power supply end of the power supply control chip, the cathode of the thyristor is grounded, the anode of the thyristor is connected to the midpoint of the first resistor and the midpoint of the second resistor, the first end of the energy storage module is grounded, the second end of the energy storage module is connected to the midpoint of the first resistor and the midpoint of the second resistor, so that when the voltage monitoring circuit detects overvoltage of the voltage detection point, a thyristor gating signal can be output to the thyristor to control the thyristor to be switched on, and after the thyristor is switched on, the energy storage module can discharge through the thyristor and rapidly pull down the potentials at the midpoint of the first resistor and the second resistor, the purpose of switching off the power supply output of the power supply end of the power supply control chip is realized, the direct current supply end can provide a maintaining current for the thyristor to maintain the thyristor to be reliably and continuously switched on continuously, so that the power supply control chip can reliably maintain the power supply end of the power supply system in a cut off state, the power supply system can reliably, and the power supply system can repeatedly and the circuit can be in a hiccup, and the situation that the circuit system is repeatedly, and the circuit system can be used without causing the surge.
The present application further provides an overvoltage protection circuit method, which is applied to the aforementioned overvoltage protection circuit, and referring to fig. 6 in combination with fig. 1 to 5, the overvoltage protection method includes:
step S10, when the overvoltage of the voltage detection point is detected, outputting a thyristor gating signal to a thyristor, wherein the thyristor gating signal is used for controlling the thyristor to be conducted;
step S20, providing a maintaining current for the thyristor through a direct current power supply end, wherein the maintaining current is used for maintaining the thyristor to be reliably conducted;
and S30, cutting off the power supply output of the power supply end of the power supply control chip when the thyristor is reliably conducted.
The energy storage module comprises a diode and an energy storage unit, and the overvoltage protection method further comprises the following steps:
step A10, when the thyristor is reliably conducted, controlling the energy storage unit to discharge through the diode and the thyristor, and cutting off the power supply output of the power supply end of the power supply control chip;
and A20, when the thyristor is not reliably conducted, the energy storage unit is charged through the power supply output of the power supply end of the power supply control chip.
Wherein, voltage monitoring circuit includes overvoltage detection circuit and opto-coupler, when detecting voltage detection point overvoltage, export thyristor gate control signal to the thyristor, include:
step S11, if the overvoltage detection circuit detects that the voltage detection point is overvoltage, an optical coupler control signal is output to the optical coupler through the overvoltage detection circuit, wherein the optical coupler control signal is a low-level signal;
and S12, controlling the optocoupler to be conducted according to the optocoupler control signal to generate the thyristor gating signal, wherein the thyristor gating signal is a high-level signal.
Wherein, overvoltage detection circuit includes comparator and reference power supply, if through overvoltage detection circuit detects voltage detection point overvoltage, then through overvoltage detection circuit to opto-coupler output opto-coupler control signal includes:
step S111, acquiring a voltage signal generated by the voltage detection point and a reference voltage signal output by the reference power supply;
step S112, when the overvoltage of the voltage detection point is determined, comparing the voltage signal with the reference voltage signal through the comparator to generate the optocoupler control signal;
and S113, outputting an optical coupling control signal to the optical coupler through the comparator.
It can be understood that, because the overvoltage protection circuit is used in the overvoltage protection method, the embodiment of the overvoltage protection method includes all technical solutions of all embodiments of the overvoltage protection circuit, and the achieved technical effects are also completely the same, and are not described herein again.
In addition, the present application further provides a power supply system, where the power supply system includes a switching power supply and the overvoltage protection circuit, and it can be understood that, because the overvoltage protection circuit is used in the power supply system, the embodiment of the power supply system includes all technical solutions of all embodiments of the overvoltage protection circuit, and the achieved technical effects are also completely the same, and are not described herein again.
The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications and equivalents of the subject matter of the present application, which is intended to be covered by the claims and their equivalents, or which are directly or indirectly applicable to other related arts are intended to be included within the scope of the present application.
Claims (10)
1. An overvoltage protection circuit, characterized in that the overvoltage protection circuit comprises:
the voltage monitoring circuit is used for outputting a thyristor gating signal to the thyristor when detecting that the voltage detection point is overvoltage, and the thyristor gating signal is used for controlling the thyristor to be conducted;
the power supply circuit comprises a first resistor and a second resistor, wherein the first resistor and the second resistor are connected in series between a direct current power supply end and a power supply end of a power supply control chip, and the direct current power supply end is used for providing a maintaining current for a thyristor when the thyristor is conducted so as to ensure that the thyristor is reliably conducted;
the cathode of the thyristor is grounded, and the anode of the thyristor is connected to the midpoint of the first resistor and the second resistor;
the first end of the energy storage module is grounded, the second end of the energy storage module is connected with the middle point of the first resistor and the middle point of the second resistor, and the energy storage module is used for discharging through the thyristor when the thyristor is switched on so as to cut off the power supply output of the power supply end of the power supply control chip.
2. The overvoltage protection circuit of claim 1, wherein the energy storage module includes a diode and an energy storage unit,
the first end of the energy storage unit is grounded, and the second end of the energy storage unit is connected with the anode of the diode and the power supply end of the power supply control chip;
and the cathode of the diode is connected to the midpoint of the first resistor and the second resistor.
3. The overvoltage protection circuit of claim 2, wherein the energy storage unit is configured to discharge through the thyristor and the diode when the thyristor is reliably conducting; and when the thyristor is not reliably conducted, the energy storage unit is used for outputting energy storage based on the power supply of the power supply end of the power supply control chip.
4. The overvoltage protection circuit of claim 1, wherein the voltage monitoring circuit includes an overvoltage detection circuit and an optocoupler,
the overvoltage detection circuit is used for outputting an optical coupler control signal to the optical coupler when detecting that the voltage detection point is overvoltage, wherein the optical coupler control signal is a low-level signal;
the optocoupler is used for conducting when receiving the optocoupler control signal and outputting the thyristor gating signal to the thyristor, wherein the thyristor gating signal is a high-level signal.
5. The overvoltage protection circuit of claim 4, wherein the overvoltage detection circuit includes a comparator and a reference supply,
the reference power supply is used for outputting a reference voltage signal to the comparator;
the negative input end of the comparator is connected with the voltage detection point, the positive input end of the comparator is connected with the output end of the reference power supply, the output end of the comparator is connected with the optocoupler, the comparator is used for comparing the voltage signal of the voltage detection point with the reference voltage signal, and the optocoupler control signal is generated when the voltage detection point is determined to be overvoltage.
6. An overvoltage protection method applied to an overvoltage protection circuit according to any one of claims 1 to 5, the overvoltage protection method comprising:
when detecting that the voltage detection point is overvoltage, outputting a thyristor gating signal to a thyristor, wherein the thyristor gating signal is used for controlling the thyristor to be conducted;
providing a maintaining current for the thyristor through a direct current power supply end, wherein the maintaining current is used for maintaining the thyristor to be reliably conducted;
and when the thyristor is reliably conducted, cutting off the power supply output of the power supply end of the power supply control chip.
7. The method of claim 6, wherein the energy storage module comprises a diode and an energy storage unit, the method further comprising:
when the thyristor is reliably conducted, the energy storage unit is controlled to discharge through the diode and the thyristor, and the power supply output of the power supply end of the power supply control chip is cut off;
and when the thyristor is not reliably conducted, the energy storage unit is charged by the power supply output of the power supply end of the power supply control chip.
8. The method of claim 6, wherein the voltage monitoring circuit comprises an overvoltage detection circuit and an optocoupler, and wherein outputting a thyristor gating signal to the thyristor when the voltage detection point is detected as being overvoltage comprises:
if the overvoltage detection circuit detects that the voltage detection point is overvoltage, an optical coupler control signal is output to the optical coupler through the overvoltage detection circuit, wherein the optical coupler control signal is a low-level signal;
and controlling the optocoupler to be conducted according to the optocoupler control signal to generate the thyristor gating signal, wherein the thyristor gating signal is a high-level signal.
9. The overvoltage protection method according to claim 8, wherein the overvoltage detection circuit comprises a comparator and a reference power supply, and the step of outputting an optocoupler control signal to the optocoupler through the overvoltage detection circuit if the overvoltage detection point is detected through the overvoltage detection circuit comprises:
acquiring a voltage signal generated by the voltage detection point and a reference voltage signal output by the reference power supply;
when the voltage detection point is determined to be overvoltage, the voltage signal and the reference voltage signal are compared through the comparator, and the optical coupler control signal is generated;
and outputting an optical coupling control signal to the optical coupler through the comparator.
10. A power supply system, characterized in that the power supply system comprises: a switching power supply and an overvoltage protection circuit as claimed in any one of claims 1 to 5.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210971598.3A CN115207876A (en) | 2022-08-12 | 2022-08-12 | Overvoltage protection circuit, method and power supply system |
| PCT/CN2023/098418 WO2024032118A1 (en) | 2022-08-12 | 2023-06-05 | Overvoltage protection circuit and method, and power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210971598.3A CN115207876A (en) | 2022-08-12 | 2022-08-12 | Overvoltage protection circuit, method and power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115207876A true CN115207876A (en) | 2022-10-18 |
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ID=83586739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210971598.3A Pending CN115207876A (en) | 2022-08-12 | 2022-08-12 | Overvoltage protection circuit, method and power supply system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115207876A (en) |
| WO (1) | WO2024032118A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024032118A1 (en) * | 2022-08-12 | 2024-02-15 | 苏州汇川控制技术有限公司 | Overvoltage protection circuit and method, and power supply system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205231714U (en) * | 2015-11-27 | 2016-05-11 | 深圳Tcl新技术有限公司 | Switching power supply protection circuit and switching power supply |
| DE102017109378B4 (en) * | 2017-02-16 | 2022-07-07 | Dehn Se | Electronic fuse for a load that can be connected to a low-voltage direct current network to protect against transient and temporary overvoltages |
| CN208849440U (en) * | 2018-10-16 | 2019-05-10 | 浙江沃科电子科技有限公司 | A kind of multiple-channel output overvoltage crowbar |
| CN115207876A (en) * | 2022-08-12 | 2022-10-18 | 苏州汇川控制技术有限公司 | Overvoltage protection circuit, method and power supply system |
-
2022
- 2022-08-12 CN CN202210971598.3A patent/CN115207876A/en active Pending
-
2023
- 2023-06-05 WO PCT/CN2023/098418 patent/WO2024032118A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024032118A1 (en) * | 2022-08-12 | 2024-02-15 | 苏州汇川控制技术有限公司 | Overvoltage protection circuit and method, and power supply system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024032118A1 (en) | 2024-02-15 |
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