Surge protection circuit, power supply circuit, and electronic device

Abstract

The utility model discloses a surge protection circuit, a power supply circuit and electronic equipment, and the surge protection circuit comprises an energy storage circuit which is used for being coupled with a power supply input circuit and a load circuit so as to receive a power supply input signal provided by the power supply input circuit, and outputting a load power supply signal to the load circuit; the surge suppression circuit is coupled with the energy storage circuit; a bypass tank circuit coupled to the tank circuit and the surge suppression circuit; and the bypass switch circuit is coupled with the energy storage circuit, the surge suppression circuit and the bypass energy storage circuit, and the bypass switch circuit is configured to store energy for the bypass energy storage circuit by using the power input signal when the load power supply signal is lower than a first set threshold value so as to limit the load power supply signal within a second set threshold value. By means of the scheme, the surge protection circuit can effectively restrain the surge current from damaging related circuits, and effectively restrain the surge current from being generated when power input is interrupted for a short time and then recovered, so that it is guaranteed that a load circuit maintains normal work and operation.

Description

Technical Field

[0001] The present application relates to the field of power management technology, and in particular to a surge protection circuit, a power supply circuit, and an electronic device. Background Art

[0002] Nowadays, when the power supply is turned on, the power supply usually quickly charges the energy storage capacitor inside the electrical equipment, forming a surge current.

[0003] During this process, the peak value of the surge current will be much greater than the rated working current of the power load, thereby bringing the risk of over-stress failure to one or more of any reasonable circuit components in the charging circuit, such as distribution circuit breakers, fuses, semiconductor power devices, capacitors, etc. Utility Model Content

[0004] The present application provides a surge protection circuit, a power supply circuit and an electronic device. The surge protection circuit can solve the problem in the prior art that the surge current generated at the moment the power is turned on causes the risk of over-electrical stress failure of each circuit component in the corresponding charging circuit of the electrical load.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a surge protection circuit, wherein the surge protection circuit includes: an energy storage circuit, which is used to couple with the power supply input circuit and the load circuit to receive the power input signal provided by the power supply input circuit and output the load power supply signal to the load circuit; a surge suppression circuit, which is coupled with the energy storage circuit; a bypass energy storage circuit, which is coupled with the energy storage circuit and the surge suppression circuit; a bypass switch circuit, which is coupled with the energy storage circuit, the surge suppression circuit and the bypass energy storage circuit, and the bypass switch circuit is configured to use the power input signal to store energy in the bypass energy storage circuit when the load power supply signal is lower than a first set threshold value, so as to limit the load power supply signal to within a second set threshold value.

[0006] In which, the surge protection circuit also includes a control circuit, which couples the energy storage circuit and the bypass switch circuit. The control circuit is configured to obtain the power input signal and the load power supply signal in the energy storage circuit to determine the sending method of the drive shutdown signal based on the power input signal and the load power supply signal; the bypass switch circuit is configured to receive the drive shutdown signal sent by the control circuit according to the sending method to trigger the shutdown when the current of the power input signal is greater than the third set threshold, or the voltage of the load power supply signal is lower than the fourth set threshold, and use the power input signal to store energy in the bypass energy storage circuit.

[0007] In which, the control circuit is also configured to obtain the bypass voltage signal at both ends of the bypass switch circuit to determine the sending method of the drive conduction signal based on the bypass voltage signal; the bypass switch circuit is configured to receive the drive conduction signal sent by the control circuit according to the sending method, so as to trigger conduction when the bypass voltage signal is at the fifth set threshold, and use the power input signal to store energy in the energy storage circuit.

[0008] The energy storage circuit is configured to output a load power supply signal to the load circuit using the stored energy of the energy storage circuit when the load power supply signal is lower than a first set threshold.

[0009] In which, the surge protection circuit also includes a bypass freewheeling circuit, which couples the energy storage circuit, the surge suppression circuit, the bypass energy storage circuit and the bypass switching circuit; wherein, the bypass switching circuit is configured to trigger shutdown when the voltage of the load power supply signal is lower than a fourth set threshold, so that the stored energy of the energy storage circuit outputs the load power supply signal to the load circuit through the bypass freewheeling circuit.

[0010] In which, the energy storage circuit includes an energy storage capacitor, the surge suppression circuit includes a surge suppression resistor, the bypass energy storage circuit includes a bypass energy storage capacitor, and the bypass switch circuit includes a controlled normally open contact; in which, the first end of the energy storage capacitor is used to couple with the first end of the power supply input circuit and the first end of the load circuit, the second end of the energy storage capacitor is coupled with the first end of the surge suppression resistor, the first end of the bypass energy storage capacitor and the first end of the controlled normally open contact, the second end of the surge suppression resistor is coupled with the second end of the bypass energy storage capacitor and the second end of the controlled normally open contact, and is used to couple with the second end of the power supply input circuit and the second end of the load circuit.

[0011] The first equivalent capacitance value of the energy storage capacitor is greater than the second equivalent capacitance value of the bypass energy storage capacitor.

[0012] Among them, the surge protection circuit also includes a signal function circuit, which is coupled to the energy storage circuit and is used to couple with the power supply input circuit and the load circuit. The signal function circuit is configured to receive the power input signal provided by the power supply input circuit, to use the power input signal to output a load power supply signal to the load circuit, and to store energy in the energy storage circuit.

[0013] In order to solve the above technical problems, another technical solution adopted in this application is: to provide a power supply circuit, wherein the power supply circuit includes a power supply input circuit and a surge protection circuit, the power supply input circuit is coupled to the surge protection circuit, and the surge protection circuit is used to couple with the load circuit; the surge protection circuit is a surge protection circuit as described in any of the above items.

[0014] To solve the above technical problems, another technical solution adopted in this application is: to provide an electronic device, wherein the electronic device includes a shell and a power supply function circuit connected to the shell; wherein the power supply function circuit is a surge protection circuit or a power supply circuit as described in any of the above items.

[0015] The beneficial effects of the present application are as follows: different from the prior art, the energy storage circuit in the surge protection circuit provided by the present application is used to couple with the power supply input circuit and the load circuit to receive the power input signal provided by the power supply input circuit and output the load power supply signal to the load circuit. The surge suppression circuit is coupled to the energy storage circuit, so that in the initial stage of power supply of the power supply input circuit, the energy storage circuit can be stored in the energy storage circuit through the surge suppression circuit to effectively suppress the damage caused by the surge current to the related circuit; and the bypass switching circuit in the surge protection circuit is configured to use the power input signal to store energy in the bypass energy storage circuit when the load power supply signal is lower than the first set threshold, that is, when the power supply input circuit is powered off, especially when the power input of the power supply input circuit is short-term interrupted and then restored, so as to limit the load power supply signal to within the second set threshold, so as to effectively suppress the voltage mutation caused by the surge current generated by the power input signal, thereby ensuring that the load circuit can effectively maintain normal operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts. Among them:

[0017] Figure 1 This is a schematic structural diagram of a first embodiment of a surge protection circuit of the present application;

[0018] Figure 2 This is a schematic structural diagram of a second embodiment of the surge protection circuit of the present application;

[0019] Figure 3 This is a schematic structural diagram of a third embodiment of the surge protection circuit of the present application;

[0020] Figure 4 is a structural diagram of an embodiment of a first power supply regulating circuit;

[0021] Figure 5 is a structural diagram of an embodiment of a second power supply regulating circuit;

[0022] Figure 6 is a schematic structural diagram of an embodiment of a third power supply regulation circuit;

[0023] Figure 7 yes Figure 4 The first power supply regulation circuit, Figure 5 The second power supply regulating circuit and Figure 6 A schematic diagram of waveform simulation of various electrical signals of the third power supply regulation circuit under the first control mode;

[0024] Figure 8 yes Figure 3 Surge protection circuit and Figure 6 A schematic diagram of waveform simulation of various electrical signals of the third power supply regulation circuit in the second control mode;

[0025] Figure 9 yes Figure 3 The signal threshold range and the current flowing through the surge suppression resistor corresponding to the controlled normally open contact of the surge protection circuit triggering the conduction Figure 6 A schematic waveform diagram of a signal threshold range of a current flowing through a third surge suppression resistor corresponding to the third power supply regulation circuit triggering the third controlled normally open contact to conduct;

[0026] Figure 10 yes Figure 6 A waveform diagram of a signal threshold range of a third bypass voltage signal corresponding to the third power supply regulation circuit triggering the third controlled normally open contact to be turned on;

[0027] Figure 11 yes Figure 3 A schematic diagram of the waveform of the signal threshold range of the bypass voltage signal corresponding to the controlled normally open contact being triggered by the surge protection circuit;

[0028] Figure 12 This is a schematic structural diagram of an embodiment of the power supply circuit of the present application;

[0029] Figure 13 It is a structural diagram of an embodiment of the electronic device of the present application. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] The terms "first," "second," and "third" in this application are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of such features. In the description of this application, "multiple" means at least two, for example, two, three, etc., unless otherwise specifically defined. All directional indications in the embodiments of this application (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship, movement, etc. between the components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications also change accordingly. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or devices.

[0032] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0034] See Figure 1 , Figure 1 FIG1 is a schematic diagram of the structure of the first embodiment of the surge protection circuit of the present application. In this embodiment, the surge protection circuit 10 includes: a tank circuit 11, a surge suppression circuit 12, a bypass tank circuit 13 and a bypass switch circuit 14.

[0035] Among them, a surge protection circuit 10 provided in the present application is specifically used to power electrical loads, especially in scenarios where energy storage capacitors are used to achieve power-off retention, in order to protect the electrical loads from the influence of transient voltages (surges) in the power input, and to ensure the normal operation of the electrical loads by suppressing possible surge currents.

[0036] Specifically, the energy storage circuit 11 is used to couple with an external power supply input circuit 101 to receive a power input signal provided by the power supply input circuit 101; and the energy storage circuit 11 is also correspondingly coupled with an external load circuit 102 to utilize the power input signal to obtain a load power supply signal and output it to the load circuit 102 to meet the power usage of the load circuit 102.

[0037] It is worth noting that the power supply input circuit 101 can specifically be any reasonable power supply such as a city grid power frequency power supply, a photovoltaic power supply, an independent generator, various types of batteries, etc.; or, the power supply input circuit 101 can specifically be an electric energy conversion circuit used to convert and adjust any reasonable upper power supply to obtain a power input signal, and this application does not limit this.

[0038] Furthermore, the term "coupled" as used herein encompasses both direct and indirect connection methods. Therefore, if a first circuit is described as being coupled to a second circuit, this means that the first circuit may be directly connected to the second circuit via electrical connection, wireless transmission, optical transmission, or other signal connection methods, or may be indirectly connected to the second circuit via other circuits or connection methods.

[0039] In some embodiments, the energy storage circuit 11 may specifically include capacitors and / or inductors and / or any other reasonable energy storage elements, which are used to store energy under normal circumstances and release energy when the power supply is interrupted or fluctuates to maintain the stability of the load power supply signal. This application does not limit this.

[0040] The surge suppression circuit 12 is coupled to the energy storage circuit 11 and is used to charge the energy storage circuit 11 through the surge suppression circuit 12 when the power input signal is normally input, so as to utilize the surge suppression circuit 12 to suppress the transient voltage in the power input signal, that is, the surge current.

[0041] In some embodiments, the surge suppression circuit 12 may specifically include a varistor, a transient voltage suppression diode, or any other reasonable nonlinear element. These elements will quickly turn on when the voltage exceeds a certain threshold, discharging excess voltage energy to protect the subsequent circuit from damage. This application does not limit this.

[0042] The bypass energy storage circuit 13 is coupled to the energy storage circuit 11 and the surge suppression circuit 12 to provide additional energy storage when the power input signal is unstable.

[0043] In some embodiments, the bypass energy storage circuit 13 may specifically include capacitors and / or inductors and / or any other reasonable energy storage elements to ensure the stability of the load power supply signal when the power input signal is unstable. This application does not limit this.

[0044] The bypass switch circuit 14 is coupled to the energy storage circuit 11, the surge suppression circuit 12 and the bypass energy storage circuit 13, and is used to trigger on or off in response to the power input signal and / or the load power supply signal, so that when the load power supply signal is lower than the first set threshold, that is, when the power input signal provided by the power input circuit 101 is interrupted, especially during the process of short-term interruption and recovery of the power input signal, the change of the switching state of the bypass switch circuit 14 is used to make the power input signal in the initial recovery stage flow through the bypass energy storage circuit 13 for energy storage, so as to avoid the voltage mutation caused by flowing through the surge suppression circuit 12, thereby limiting the load power supply signal to within the second set threshold, so as to avoid the possible surge current from impacting the load circuit 102.

[0045] It is worth noting that the first set threshold value can specifically correspond to an interruption in the power input signal of the power supply input circuit 101, that is, the voltage detection judgment threshold value at which the load power supply signal drops due to the power interruption, so that when it is determined that the load power supply signal is lower than the first set threshold value, it can be determined that the power input signal is interrupted, and then the control method of the bypass switch circuit 14 can be determined.

[0046] In addition, the second set threshold can be understood as a safe voltage operating threshold that the load circuit 102 can withstand without causing damage to circuit components, so that when the load power supply signal is limited to the second set threshold, it can effectively avoid surge current from causing impact damage to the load circuit 102; and the first set threshold and the second set threshold can be specifically determined by the actual power supply scenario, and this application does not limit this.

[0047] In some embodiments, the bypass switch circuit 14 may specifically include any reasonable controlled switching element such as a relay, a MOS (Metal Oxide Semiconductor Field Effect Transistor), a triode, a thin film transistor or a field effect transistor, so that it can be triggered to turn on or off when receiving a corresponding drive control signal. This application does not limit this.

[0048] In the above scheme, the energy storage circuit 11 in the surge protection circuit 10 is used to couple with the power input circuit 101 and the load circuit 102 to receive the power input signal provided by the power input circuit 101 and output the load power supply signal to the load circuit 102. The surge suppression circuit 12 is coupled to the energy storage circuit 11, so that in the initial stage of power supply of the power input circuit 101, the energy storage circuit 11 can be stored via the surge suppression circuit 12 to effectively suppress the damage caused by the surge current to the related circuits. In addition, the bypass switch circuit 14 in the surge protection circuit 10 is configured to use the power input signal to store energy in the bypass energy storage circuit 13 when the load power supply signal is lower than a first set threshold, that is, when the power input circuit 101 is powered off, especially when the power input of the power input circuit 101 is briefly interrupted and then restored, so as to limit the load power supply signal to within a second set threshold, thereby effectively suppressing the voltage mutation caused by the surge current generated by the power input signal, thereby ensuring that the load circuit 102 can effectively maintain normal operation, protecting the load circuit 102 from the influence of transient voltage in the power input, and improving the stability and reliability of the system.

[0049] See Figure 2 , Figure 2 This embodiment is based on the first embodiment of the surge protection circuit provided in this application, and the surge protection circuit 20 specifically further includes a control circuit 25 .

[0050] Specifically, the control circuit 25 is coupled to the energy storage circuit 21 and the bypass switch circuit 24 to sample and obtain the power input signal received by the energy storage circuit 21 and the load power supply signal provided to the load circuit 102, and detect and analyze the characteristics and states of the power input signal and the load power supply signal, such as the current amplitude, voltage amplitude, waveform frequency, and size comparison results between the two signals and the set threshold, and other reasonable characteristic information, so as to determine whether it is necessary to send a drive shutdown signal and the specific time to send the drive shutdown signal based on the analysis results, and send the drive shutdown signal in an appropriate manner.

[0051] The bypass switch circuit 24 is used to receive the drive shutdown signal sent by the control circuit 25 in accordance with the sending method determined above, so as to trigger the shutdown in response to the current of the power input signal being greater than the third set threshold. That is, the control circuit 25 can specifically send a drive shutdown signal to the bypass switch circuit 24 when detecting and determining that the current of the currently obtained power input signal is greater than the third set threshold, so as to trigger the bypass switch circuit 24 to shut down, thereby allowing the power input signal to flow through the bypass energy storage circuit 23 to store energy in the bypass energy storage circuit 23.

[0052] In another embodiment, the control circuit 25 can also specifically send a drive shutdown signal to the bypass switch circuit 24 when it detects that the voltage of the currently obtained load power supply signal is lower than the fourth set threshold value, so as to trigger the bypass switch circuit 24 to shut down, thereby allowing the power input signal to flow through the bypass energy storage circuit 23 to store energy in the bypass energy storage circuit 23.

[0053] It is worth noting that the third set threshold value may specifically correspond to the detection and judgment threshold value of the surge current that will cause damage to the circuit after the power input signal of the power supply input circuit 101 is interrupted and restored. When the control circuit 25 determines that the current of the power input signal is greater than the third set threshold value, it can correspondingly determine that the current amplitude of the power input signal is too large and there is a trend of continuing to increase and causing damage to the circuit, and then determine the moment to send a drive shutdown signal to the bypass switch circuit 24.

[0054] In addition, the fourth set threshold can be understood as an interruption in the power input signal of the power supply input circuit 101, that is, a voltage detection judgment threshold at which the load power supply signal drops due to the power interruption. When the control circuit 25 determines that the load power supply signal is lower than the fourth set threshold, it can correspondingly determine that the power input signal is interrupted, and then determine the moment to send a drive shutdown signal to the bypass switch circuit 24.

[0055] In order to avoid the instantaneous peak voltage of the power input signal after the interruption is restored, that is, the surge current causing damage to the circuit, the control circuit 25 specifically sends a drive shutdown signal to the bypass switch circuit 24 before the power input signal is restored, that is, the moment when the load power supply signal is lower than the fourth set threshold is specifically a specific moment in the power supply interruption stage. At this time, the power input signal has not yet been restored. The control circuit 25 can also specifically disconnect the bypass switch circuit 24 in advance to prepare in advance for suppressing the power input circuit 101 from restoring the power input surge current.

[0056] Therefore, compared to allowing the power input signal to flow through the bypass energy storage circuit 23 for energy storage when it is determined that the current of the power input signal is greater than the third set threshold, that is, when a large current amplitude already exists and there is a tendency for surge current to occur, it is obvious that by turning off the bypass switch circuit 24 in advance so that the power input signal flows through the bypass energy storage circuit 23 for energy storage when it recovers from 0, the occurrence of surge current can be more effectively suppressed, that is, the peak value of the power input signal after power supply is restored can be more effectively suppressed.

[0057] Among them, the third set threshold and the fourth set threshold can be specifically determined by the actual power supply scenario, and the fourth set threshold can be the same as or different from the first set threshold, which is not limited in this application.

[0058] In some embodiments, the control circuit 25 may specifically include one or more of any reasonable circuit units with program and signal processing functions, such as an MCU (Micro Control Unit) circuit, a CPU (Central Processing Unit), a system-level processing chip, a single-chip microcomputer, a field programmable gate array, a programmable logic device, a discrete gate or transistor logic device, a discrete hardware, etc., and this application does not limit this.

[0059] In one embodiment, the control circuit 25 is further used to sample and obtain the bypass voltage signal at both ends of the bypass switch circuit 24 from the bypass switch circuit 24, so as to detect and analyze the characteristics and status of the bypass voltage signal, such as the voltage amplitude, the amplitude change rate, etc., and determine whether it is necessary to send a drive conduction signal and the specific time to send the drive conduction signal based on the analysis results, and then send the drive conduction signal in an appropriate manner.

[0060] The bypass switch circuit 24 is used to receive the drive conduction signal sent by the control circuit 25 in accordance with the above-determined sending method, and to trigger conduction in response to the bypass voltage signal being at the fifth set threshold, so that the power input signal stores energy in the energy storage circuit 21 through the bypass switch circuit 24, so as to facilitate the subsequent use of the stored energy of the energy storage circuit 21 to achieve power-off maintenance for the load circuit 102.

[0061] Furthermore, in one embodiment, the energy storage circuit 21 is also used to maintain the load power supply signal output to the load circuit 102 for a certain period of time using the stored energy of the energy storage circuit 21 when the load power supply signal is lower than the first set threshold, that is, when the power input signal provided by the power supply input circuit 101 is interrupted; and in the power-off maintenance stage, when the power input signal of the power supply input circuit 101 specifically corresponds to a short interruption recovery, it can effectively ensure that the load circuit 102 continues to operate normally to ensure power supply stability.

[0062] In some embodiments, when the control circuit 25 determines that the power input circuit 101 is providing a power input signal for the first time, that is, when the surge protection circuit 20 is powered on for the first time, it can also send a drive shutdown signal to the bypass switch circuit 24 to trigger the bypass switch circuit 24 to shut down, so that the power input signal flows through the surge suppression circuit 22 to charge the energy storage circuit 21, so as to use the surge suppression circuit 22 to effectively limit the surge current of the energy storage circuit 21; and when it is determined that the energy storage circuit 21 is finished charging, it sends a drive conduction signal to the bypass switch circuit 24 to trigger the bypass switch circuit 24 to turn on, thereby effectively realizing input surge suppression control and avoiding the subsequent adverse effects of the surge suppression circuit 22 on the energy storage circuit 21 using stored energy to achieve power-off retention.

[0063] The above solution couples the bypass energy storage circuit 23 with the bypass switch circuit 24 and the surge suppression circuit 22 so that when the load circuit 102 is operating normally and the power input signal provided by the power input circuit 101 is briefly interrupted, the load circuit 102 will continue to operate using the internal energy storage of the energy storage circuit 21, and the voltage across the energy storage circuit 21 will continue to decrease.

[0064] At this point, if the power supply input circuit 101 is restored, the restored voltage will be much higher than the voltage of the energy storage circuit 21 after it drops. With the bypass switch circuit 24 in the on-closed state, the power input signal will directly and rapidly charge the energy storage circuit 21 via the bypass switch circuit 24, thereby generating an inrush current. However, the control circuit 25 detects the magnitude of the inrush current of the power input signal and controls the bypass switch circuit 24 to open when the input inrush current exceeds a certain threshold, i.e., a third set threshold, which is generally greater than the maximum load current. This allows the power input signal to flow through the bypass energy storage circuit 23 for energy storage, rather than directly through the surge suppression resistor, which can cause a sudden voltage change.

[0065] After the power input signal quickly increases the voltage across the bypass energy storage circuit 23, when the voltage of the series branch between the bypass energy storage circuit 23 and the energy storage circuit 21 is greater than the input voltage of the power input signal, the surge current of the power input signal will drop rapidly, and then the surge suppression circuit 22 will limit the charging current amplitude of the energy storage circuit 21.

[0066] In one embodiment, the surge protection circuit 20 further includes a bypass freewheeling circuit 26 . The bypass freewheeling circuit 26 is coupled to the energy storage circuit 21 , the surge suppression circuit 22 , the bypass energy storage circuit 23 , and the bypass switch circuit 24 .

[0067] Among them, the bypass switch circuit 24 is also used to trigger shutdown in response to the voltage of the load power supply signal being lower than the fourth set threshold, that is, when the power input signal provided by the power supply input circuit 101 is interrupted, so that the current stored energy of the energy storage circuit 21 can output the load power supply signal to the load circuit 102 through the bypass freewheeling circuit 26, thereby avoiding the energy storage discharge current of the energy storage circuit 21 through the surge suppression circuit 22, causing fluctuations in the load power supply signal and causing losses, so as to ensure the normal use of the load circuit 102.

[0068] Specifically, the control circuit 25 is used to sample and obtain the load power supply signal provided by the energy storage circuit 21 to the load circuit 102, so as to send a drive shutdown signal to the bypass switch circuit 24 when it is determined that the voltage of the load power supply signal is lower than the fourth set threshold, so as to trigger the bypass switch circuit 24 to trigger shutdown.

[0069] It is understandable that by setting the bypass freewheeling circuit 26, when the power supply input circuit 101 is interrupted for a short time and the load circuit 102 is powered by the energy stored in the energy storage circuit 21, the bypass switch circuit 24 can be disconnected in advance to prepare for suppressing the input surge current when the power supply input circuit 101 is restored.

[0070] In one embodiment, the surge protection circuit 20 further includes a signal function circuit 27 . The signal function circuit 27 is coupled to the energy storage circuit 21 and is configured to couple to the power input circuit 101 and the load circuit 102 .

[0071] Among them, the signal function circuit 27 is used to receive the power input signal provided by the power supply input circuit 101, and use the power input signal to obtain a load power supply signal to output it to the load circuit 102 to meet the power usage of the load circuit 102; and the signal function circuit 27 is also used to output the power input signal to the energy storage circuit 21 to store energy in the energy storage circuit 21.

[0072] It is worth noting that the signal function circuit 27 can be specifically understood as an equivalent circuit of the input loop impedance of the surge protection circuit 20, or it can be understood as a circuit unit that realizes one or more of any reasonable signal functions such as power conversion, regulation, and detection in the process of powering the load circuit 102 using the power input signal provided by the power input circuit 101. This application does not limit this.

[0073] In one embodiment, the surge protection circuit 20 specifically further includes a sampling circuit (not shown), which is coupled to the energy storage circuit 21 and the control circuit 25 for sampling and obtaining the power input signal and the load power supply signal in the energy storage circuit 21, so as to send the power input signal and the load power supply signal to the control circuit 25, so that the control circuit 25 controls the bypass switch circuit 24 based on the power input signal and the load power supply signal.

[0074] See Figure 3 , Figure 3 This embodiment is based on the second embodiment of the surge protection circuit provided in this application, and the energy storage circuit 31 in the surge protection circuit 30 specifically includes an energy storage capacitor C1.

[0075] The surge suppression circuit 32 specifically includes a surge suppression resistor Zy, the bypass energy storage circuit 33 includes a bypass energy storage capacitor Cp, and the bypass switch circuit 34 includes a controlled normally open contact Kc.

[0076] Specifically, the first end of the energy storage capacitor Cl is used to couple with the first end of the power supply input circuit 101 and the first end of the load circuit 102, the second end of the energy storage capacitor Cl is coupled with the first end of the surge suppression resistor Zy, the first end of the bypass energy storage capacitor Cp and the first end of the controlled normally open contact Kc, the second end of the surge suppression resistor Zy is coupled with the second end of the bypass energy storage capacitor Cp and the second end of the controlled normally open contact Kc, and is used to couple with the second end of the power supply input circuit 101 and the second end of the load circuit 102.

[0077] In some embodiments, the controlled normally open contact Kc can specifically be any normally open contact in the relay, so that when the coil of the relay receives the corresponding drive control signal sent by the control circuit 35, the normally open contact can be triggered to turn on or off; and the controlled normally open contact Kc can also specifically be the other two ends of any reasonable switching tube such as MOS tube, triode, thin film transistor or field effect transistor that are different from the control end, so that when the control end of the switching tube receives the corresponding drive control signal sent by the control circuit 35, it can be triggered to turn on or off. This application does not limit this.

[0078] In some embodiments, the first equivalent capacitance value of the energy storage capacitor Cl is greater than the second equivalent capacitance value of the bypass energy storage capacitor Cp, which is not limited in this application.

[0079] In some embodiments, the second equivalent capacitance value of the bypass energy storage capacitor Cp may be 2%-20% of the first equivalent capacitance value of the energy storage capacitor Cl, which is not limited in this application.

[0080] In one embodiment, the surge protection circuit 30 also includes a bypass freewheeling circuit 36, which specifically includes a freewheeling diode Dx, and the first end of the freewheeling diode Dx is coupled to the second end of the bypass energy storage capacitor Cp, and the second end of the freewheeling diode Dx is coupled to the first end of the bypass energy storage capacitor Cp.

[0081] In one embodiment, the surge protection circuit 30 also includes a signal function circuit 27, which specifically includes an input loop resistor Zr, wherein the first end of the input loop resistor Zr is used to couple with the first end of the power supply input circuit 101, and the second end of the input loop resistor Zr is coupled to the first end of the energy storage capacitor Cl and is used to couple with the first end of the load circuit 102.

[0082] It can be understood that the control circuit 35 is specifically used to obtain the power input signal Ir provided by the power supply input circuit 101, the load power supply signal Vo output to the load circuit 102, and the bypass voltage signal Vk at both ends of the bypass switch circuit 34, so as to use the power input signal Ir, the load power supply signal Vo and the bypass voltage signal Vk to send a drive control signal to the bypass switch circuit 34 to trigger the controlled normally open contact Kc to turn on and off, thereby effectively suppressing the surge current that may exist in the power input signal Ir, so as to ensure that the load circuit 102 can effectively maintain normal operation.

[0083] Please continue to refer to Figure 4-Figure 6 ,in, Figure 4 is a structural diagram of an embodiment of a first power supply regulating circuit, Figure 5 is a structural diagram of an embodiment of a second power supply regulating circuit, Figure 6 FIG. 4 is a schematic structural diagram of an embodiment of a third power supply regulating circuit.

[0084] It is worth noting that, for the sake of ease of understanding, the first power supply regulation circuit 201, the second power supply regulation circuit 202 and the third power supply regulation circuit 203 are described as a reference group of the related technologies of the surge protection circuit 30 of the present application. The first power supply regulation circuit 201 specifically includes a first input loop resistor Zr1 and a first energy storage capacitor Cl1; the second power supply regulation circuit 202 specifically includes a second input loop resistor Zr2, a second energy storage capacitor Cl2, a second surge suppression resistor Zy2 and a second controlled normally open contact Kc2; the third power supply regulation circuit 203 specifically includes a third input loop resistor Zr3, a third energy storage capacitor Cl3, a third surge suppression resistor Zy3, a third controlled normally open contact Kc3 and a third bypass energy storage capacitor Cp3, and the third power supply regulation circuit 203 can be specifically understood as a specific embodiment of the surge protection circuit 10 in the first embodiment provided in the present application; wherein, the connection methods of each circuit unit in the first power supply regulation circuit 201, the second power supply regulation circuit 202 and the third power supply regulation circuit 203 are respectively as follows: Figure 4 、 Figure 5 、 Figure 6 As shown, no further details are given here.

[0085] Please continue reading Figure 7 , Figure 7 yes Figure 4 The first power supply regulation circuit, Figure 5 The second power supply regulating circuit and Figure 6 Schematic diagram of waveform simulation of various electrical signals of the third power regulation circuit under the first control mode.

[0086] It is understandable that if Figure 7As shown, the first power supply regulation circuit 201 corresponds to no surge suppression measures. During the load power supply process of receiving the first power input signal I(L1) provided by the power supply input circuit 101 and outputting the first load power supply signal VP1 to the load circuit 102, when the power supply is interrupted and then restored, the current amplitude of the first power input signal I(L1) is very high, the duration is long, and the surge energy is large; the voltage amplitude of the first load power supply signal VP1 is not high, but the fluctuation time is long; the first power supply regulation circuit 201 does not actually have a first controlled normally open contact, that is, there is no first bypass voltage signal V12, or the first bypass voltage signal V12 can always be regarded as 0.

[0087] Furthermore, in the process of the second power supply regulating circuit 202 receiving the first power supply input signal I(L2) provided by the power supply input circuit 101 and outputting the second load power supply signal VP2 to the load circuit 102, when the power supply is interrupted and then restored, the second controlled normally open contact Kc2 is controlled by the first control method, that is, when the first power supply input signal I(L2) corresponds to the normal power supply state, the second controlled normally open contact Kc2 is controlled to be closed until the current of the first power supply input signal I(L2) is detected to be greater than The third set threshold, that is, greater than 65A (amperes) is disconnected; wherein, the current amplitude of the first power input signal I(L2) can converge quickly after reaching 65A; but the voltage amplitude of the second load power supply signal VP2 is extremely high and there is a reliability risk; the second bypass voltage signal V22 at both ends of the second controlled normally open contact Kc2 in the second power regulation circuit 202 gradually decays to 0 as the second energy storage capacitor Cl2 continues to charge, creating conditions for the closure of the second controlled normally open contact Kc2.

[0088] Furthermore, in the process of the third power supply regulating circuit 203 receiving the third power supply input signal I(L3) provided by the power supply input circuit 101 and outputting the third load power supply signal VP3 to the load circuit 102, when the power supply is interrupted and then restored, the third controlled normally open contact Kc3 is controlled by the first control method, that is, when the third power supply input signal I(L3) corresponds to the normal power supply state, the third controlled normally open contact Kc3 is controlled to be closed until the current of the third power supply input signal I(L3) is detected to be greater than the third set threshold value, that is, The circuit breaker is disconnected when any reasonable current value is greater than 65A (ampere) or 66A; wherein, the current amplitude of the third power input signal I(L3) slightly exceeds 65A, which will charge the third bypass capacitor for rapid convergence; the voltage amplitude of the third load power supply signal VP3 is not high and can converge quickly; the third bypass voltage signal V32 at both ends of the third controlled normally open contact Kc3 in the third power regulation circuit 203 gradually decays to 0 as the third energy storage capacitor Cl3 continues to charge, creating conditions for the closure of the third controlled normally open contact Kc3.

[0089] Please continue reading Figure 8 , Figure 8 yes Figure 3 Surge protection circuit and Figure 6 Schematic diagram of waveform simulation of various electrical signals of the third power regulation circuit under the second control mode.

[0090] It is understandable that if Figure 8 As shown, in the process of the third power supply regulating circuit 203 receiving the third power supply input signal I(L3) provided by the power supply input circuit 101 and outputting the third load power supply signal VP3 to the load circuit 102, when the power supply is interrupted and then restored, the third controlled normally open contact Kc3 is controlled by the second control method, that is, when the third power supply input signal I(L3) corresponds to the normal power supply state, the third controlled normally open contact Kc3 is controlled to be closed until the voltage of the third load power supply signal VP3 is detected to be lower than the fourth set threshold value, that is, lower than 350V (volts) or 360V, etc., which triggers the shutdown. Any reasonable voltage value is disconnected; wherein, since the third controlled normally open contact Kc3 is disconnected before the power supply is restored, after the power supply is restored, the input surge current amplitude is small and decays quickly; after the third controlled normally open contact Kc3 is disconnected, the third load power supply signal VP3 flows through the third surge suppression resistor Zy3, and the bus voltage of the third load power supply signal VP3 drops significantly, affecting the normal use of the load circuit 102; as the third energy storage capacitor Cl3 continues to charge, the voltage of the third controlled normally open contact Kc3, that is, the third bypass voltage signal V32 gradually decays to 0, creating conditions for the closing of the third controlled normally open contact Kc3.

[0091] Furthermore, during the load power supply process in which the surge protection circuit 30 receives the power input signal Ir provided by the power input circuit 101 and outputs the load power supply signal Vo to the load circuit 102, when power is interrupted and then restored, the controlled normally open contact Kc is controlled in a second control mode. That is, when the power input signal Ir corresponds to a normal power supply state, the controlled normally open contact Kc is controlled to close until the voltage of the load power supply signal Vo is detected to be lower than a fourth set threshold, which is triggered to be disconnected when it is lower than any reasonable voltage value such as 350V or 360V. Since the controlled normally open contact Kc is disconnected before power is restored, the input surge current amplitude is small and decays quickly after power is restored. After the controlled normally open contact Kc is disconnected, the load power supply signal Vo flows through the bypass freewheeling diode Dx, and the bus voltage of the load power supply signal Vo is not affected, thereby not affecting the normal use of the load circuit 102. As the energy storage capacitor Cl continues to charge, the bypass voltage signal Vk gradually decays to 0, creating conditions for the closing of the controlled normally open contact Kc.

[0092] Please continue reading Figure 9 , Figure 9 yes Figure 3 The signal threshold range and the current flowing through the surge suppression resistor corresponding to the controlled normally open contact of the surge protection circuit triggering the conduction Figure 6 Schematic diagram of the waveform of the signal threshold range of the current flowing through the third surge suppression resistor corresponding to the third power regulation circuit triggering the third controlled normally open contact to be turned on.

[0093] It is understandable that the third controlled normally open contact Kc3 needs to be safely turned on when the current flowing through the third surge suppression resistor Zy3 is within a certain range close to 0; the controlled normally open contact Kc needs to be triggered to turn on when the current flowing through the surge suppression resistor Zy is close to 0 in the positive direction or there is a negative current, which makes the control more flexible.

[0094] Please continue to refer to Figure 10 and Figure 11 ,in, Figure 10 yes Figure 6 A waveform diagram of a signal threshold range of a third bypass voltage signal corresponding to the third power supply regulation circuit triggering the third controlled normally open contact to conduct, Figure 11 yes Figure 3 Schematic diagram of the waveform of the signal threshold range of the bypass voltage signal corresponding to the conduction of the controlled normally open contact triggered by the surge protection circuit.

[0095] It is understandable that the control circuit 35 can also specifically detect the voltage of the bypass voltage signal Vk / the third bypass voltage signal V32 to trigger the controlled normally open contact Kc / the third controlled normally open contact Kc3 to be safely turned on within a certain threshold value of the voltage close to 0.

[0096] Among them, when controlling the controlled normally open contact Kc / the third controlled normally open contact Kc3 to be turned off, the power input signal Ir / the third power input signal I(L3) can be specifically detected, so that when it is determined that the current of the power input signal Ir / the third power input signal I(L3) is greater than the third set threshold, the controlled normally open contact Kc / the third controlled normally open contact Kc3 is triggered to be turned off, so as to suppress the surge current; and specifically, the shutdown can be triggered when the voltage of the load power supply signal Vo / the third load power supply signal VP3 is lower than the fourth set threshold, so as to disconnect the controlled normally open contact Kc / the third controlled normally open contact Kc3 before the power is restored, so as to prepare for the surge current suppression after the power is restored.

[0097] This application also provides a power supply circuit, see Figure 12 , Figure 12 FIG. 4 is a schematic diagram of a power supply circuit according to an embodiment of the present invention. In this embodiment, the power supply circuit 40 includes a power supply input circuit 41 and a surge protection circuit 42 .

[0098] Specifically, the power input circuit 41 is coupled to a surge protection circuit 42 , and the surge protection circuit 42 is coupled to the load circuit 401 .

[0099] The surge protection circuit 42 described in this embodiment can be specifically the surge protection circuit 10, the surge protection circuit 20 or the surge protection circuit 30 described in any one of the above embodiments. Figure 1-11 And the related text content will not be repeated here.

[0100] This application also provides a communication device, see Figure 13 , Figure 13 FIG. 5 is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. In this embodiment, the electronic device 50 includes a housing 51 and a power supply circuit 52 connected to the housing 51 .

[0101] It should be noted that the power supply function circuit 52 described in this embodiment can specifically be the surge protection circuit 10, surge protection circuit 20, surge protection circuit 30, or power supply circuit 40 described in any one of the above embodiments. Figure 1-12 And the related text content will not be repeated here.

[0102] Different from the prior art, the energy storage circuit in the surge protection circuit provided in the present application is used to couple with the power supply input circuit and the load circuit to receive the power input signal provided by the power supply input circuit and output the load power supply signal to the load circuit. The surge suppression circuit is coupled to the energy storage circuit, so that in the initial stage of power supply of the power supply input circuit, the energy storage circuit can be stored in the energy storage circuit through the surge suppression circuit to effectively suppress the damage caused by the surge current to the related circuit; and the bypass switching circuit in the surge protection circuit is configured to use the power input signal to store energy in the bypass energy storage circuit when the load power supply signal is lower than the first set threshold, that is, when the power supply input circuit loses power, especially when the power input of the power supply input circuit is briefly interrupted and then restored, so as to limit the load power supply signal to within the second set threshold, so as to effectively suppress the voltage mutation caused by the surge current generated by the power input signal, thereby ensuring that the load circuit can effectively maintain normal operation.

[0103] The above is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A surge protection circuit, characterized in that: The surge protection circuit comprises: an energy storage circuit, configured to couple with a power supply input circuit and a load circuit to receive a power input signal provided by the power supply input circuit and output a load power supply signal to the load circuit; a surge suppression circuit coupled to the energy storage circuit; a bypass energy storage circuit, coupling the energy storage circuit and the surge suppression circuit; A bypass switch circuit is coupled to the energy storage circuit, the surge suppression circuit and the bypass energy storage circuit. The bypass switch circuit is configured to use the power input signal to store energy in the bypass energy storage circuit when the load power supply signal is lower than a first set threshold, so as to limit the load power supply signal to within a second set threshold.

2. The surge protection circuit according to claim 1, wherein: The surge protection circuit further includes a control circuit coupled to the energy storage circuit and the bypass switch circuit, the control circuit being configured to obtain a power input signal and a load power supply signal in the energy storage circuit, and to determine a sending mode of a drive shutdown signal based on the power input signal and the load power supply signal; The bypass switch circuit is configured to receive the drive shutdown signal sent by the control circuit in the sending mode, so as to trigger shutdown when the current of the power input signal is greater than a third set threshold, or the voltage of the load power supply signal is lower than a fourth set threshold, and use the power input signal to store energy in the bypass energy storage circuit.

3. The surge protection circuit according to claim 2, wherein: The control circuit is further configured to obtain a bypass voltage signal across the bypass switch circuit to determine a sending mode of the drive conduction signal based on the bypass voltage signal; The bypass switch circuit is configured to receive the drive conduction signal sent by the control circuit according to the sending mode, so as to trigger conduction when the bypass voltage signal is at a fifth set threshold, and utilize the power input signal to store energy in the energy storage circuit.

4. The surge protection circuit according to claim 3, characterized in that: The energy storage circuit is configured to output the load power supply signal to the load circuit by using the stored energy of the energy storage circuit when the load power supply signal is lower than the first set threshold.

5. The surge protection circuit according to claim 4, characterized in that: The surge protection circuit further includes a bypass freewheeling circuit, wherein the bypass freewheeling circuit is coupled to the energy storage circuit, the surge suppression circuit, the bypass energy storage circuit, and the bypass switch circuit; The bypass switch circuit is configured to trigger shutdown when the voltage of the load power supply signal is lower than the fourth set threshold, so that the stored energy of the energy storage circuit outputs the load power supply signal to the load circuit through the bypass freewheeling circuit.

6. The surge protection circuit according to any one of claims 1 to 5, characterized in that: The energy storage circuit includes an energy storage capacitor, the surge suppression circuit includes a surge suppression resistor, the bypass energy storage circuit includes a bypass energy storage capacitor, and the bypass switch circuit includes a controlled normally open contact; In which, the first end of the energy storage capacitor is used to couple with the first end of the power supply input circuit and the first end of the load circuit, the second end of the energy storage capacitor is coupled with the first end of the surge suppression resistor, the first end of the bypass energy storage capacitor and the first end of the controlled normally open contact, the second end of the surge suppression resistor is coupled with the second end of the bypass energy storage capacitor and the second end of the controlled normally open contact, and is used to couple with the second end of the power supply input circuit and the second end of the load circuit.

7. The surge protection circuit according to claim 6, characterized in that: The first equivalent capacitance value of the energy storage capacitor is greater than the second equivalent capacitance value of the bypass energy storage capacitor.

8. The surge protection circuit according to any one of claims 1 to 5, characterized in that: The surge protection circuit also includes a signal function circuit, which is coupled to the energy storage circuit and is used to couple with the power supply input circuit and the load circuit. The signal function circuit is configured to receive the power input signal provided by the power supply input circuit, output the load power supply signal to the load circuit using the power input signal, and store energy in the energy storage circuit.

9. A power supply circuit, characterized in that: The power supply circuit includes a power supply input circuit and a surge protection circuit, wherein the power supply input circuit is coupled to the surge protection circuit, and the surge protection circuit is used to couple to a load circuit; Wherein, the surge protection circuit is the surge protection circuit according to any one of claims 1 to 8.

10. An electronic device, characterized in that: The electronic device includes a housing and a power supply circuit connected to the housing; Wherein, the power supply function circuit is a surge protection circuit as described in any one of claims 1 to 8, or a power supply circuit as described in claim 9.

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