CN212627155U - Surge interference protection circuit and vehicle LED drive power supply - Google Patents
Surge interference protection circuit and vehicle LED drive power supply Download PDFInfo
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- CN212627155U CN212627155U CN202021468424.8U CN202021468424U CN212627155U CN 212627155 U CN212627155 U CN 212627155U CN 202021468424 U CN202021468424 U CN 202021468424U CN 212627155 U CN212627155 U CN 212627155U
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The application relates to a surge interference protection circuit and a vehicle LED driving power supply, wherein the circuit comprises an instantaneous peak voltage absorption module and a voltage stabilization module, wherein the instantaneous peak voltage absorption module is connected between a positive voltage input port and the ground in series to absorb instantaneous peak voltage in input voltage; and the voltage stabilizing module is connected with the instantaneous peak voltage absorbing module in parallel and used for stabilizing voltage so as to output stable voltage to a back-end circuit when nanosecond-level surge waveform voltage exists in the input voltage. The surge interference protection circuit in the embodiment can keep the voltage input to the back-end circuit in a stable state, so that the normal voltage output of the circuit can be ensured without output fluctuation when nanosecond-level surge waveforms are received.
Description
Technical Field
The utility model relates to a power technical field especially relates to a surge interference protection circuit and vehicle LED drive power supply.
Background
In the field of automotive LED signal lamp control, an LED Drive Module (LDM) is a general electronic component that needs to be able to adapt to different models of vehicles in various host plants. The manufacturing levels of the engine and the generator of each host factory are different, so that the LDM connected to the power line of the whole vehicle is subjected to voltage surge interference of various voltages and durations. Meanwhile, different types of vehicles such as gasoline vehicles, diesel vehicles, hydrogen vehicles and electric vehicles generate different surge voltage waveforms. In an extreme case, a surge voltage waveform with a voltage above 110V and a duration above 100ms may occur, which is sufficient to destroy or even burn out the LDM without a protection circuit.
Different requirements are also put forward by the host factory for different surge voltage waveforms. For example, the output of the LDM cannot fluctuate for a surge of nanosecond level. In order to bear surge interference of various vehicle types and meet the requirements of a host, a surge interference protection circuit is needed.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a surge interference protection circuit and a vehicle LED driving power supply capable of ensuring a normal voltage output of a circuit without output fluctuation when receiving a surge voltage waveform of nanosecond level.
A first aspect of the present application provides a surge interference protection circuit, including:
the instantaneous peak voltage absorbing module is connected between the positive voltage input port and the ground in series to absorb instantaneous peak voltage in the input voltage;
and the voltage stabilizing module is connected with the instantaneous peak voltage absorbing module in parallel and used for stabilizing voltage so as to output stable voltage to a rear end circuit when nanosecond-level surge waveform voltage exists in the input voltage.
In the surge interference protection circuit in the above embodiment, the instantaneous spike voltage absorbing module is arranged in series between the positive voltage input port and the ground to absorb the instantaneous spike voltage in the input voltage; and a voltage stabilizing module is arranged to be connected in parallel with the instantaneous peak voltage absorbing module so as to output a stable voltage to a back-end circuit when a nanosecond-level surge waveform voltage exists in the input voltage. The surge interference protection circuit in the embodiment can keep the voltage input to the back-end circuit in a stable state, so that the normal voltage output of the circuit can be ensured without output fluctuation when nanosecond-level surge waveforms are received.
In one embodiment, the surge interference protection circuit further comprises:
the microsecond surge detection circuit is connected with the instantaneous peak voltage absorption module in parallel and used for detecting the duration time of surge waveform voltage in the input voltage and generating a first energy conversion control signal when the duration time reaches a preset microsecond threshold;
and the surge energy conversion circuit is connected with the instantaneous peak voltage absorption module in parallel, and a control port of the surge energy conversion circuit is connected with the microsecond-level surge detection circuit and used for receiving the first energy conversion control signal and acting according to the first energy conversion control signal so as to convert part of surge energy into heat energy.
In the surge interference protection circuit in the above embodiment, the microsecond surge detection circuit can start the surge energy conversion circuit when the time of the surge waveform reaches the microsecond level, and the surge energy conversion circuit converts the part of surge energy into electric energy which can be used by the back-end circuit or other energy harmless to the module. The surge energy conversion circuit can ensure that the energy conversion outside the bearing range of the back-end circuit is realized, and meanwhile, the output is not closed due to insufficient power supply of the back-end circuit caused by excessive conversion.
In one embodiment, the microsecond surge detection circuit comprises a first voltage regulator tube and a first time detection circuit which are connected in series, wherein the cathode of the first voltage regulator tube is used for being connected with the positive voltage input port, the first time detection circuit comprises a resistor R2 and a capacitor C2 which are connected in series, the input end of the resistor R2 is connected with the anode of the first voltage regulator tube, and the cathode of the capacitor C2 is used for being grounded; and/or
The surge energy conversion circuit comprises a triode Q1 and a resistor R1, wherein the collector of the triode Q1 is connected with the cathode of the first voltage regulator tube through the resistor R1, the emitter of the triode Q1 is connected with the cathode of the capacitor C2, and the base of the triode Q1 is connected with the anode of the capacitor C2;
wherein, the time of RC charging of the microsecond surge detection circuit is configured to be microsecond.
In the surge interference protection circuit in the above embodiment, the turn-on voltage of the first voltage regulator tube may be set to be greater than the maximum value of the normal input voltage of the circuit and smaller than the regulated voltage value output by the voltage regulation module. When surge waveform voltage interference is added, the voltage stabilizing module stabilizes voltage, the first voltage stabilizing tube is conducted, the resistor R2 and the capacitor C2 carry out RC charging, the RC charging time is microsecond, if the surge waveform time reaches the RC charging time, the triode Q1 is conducted, and partial energy of surge flows through the resistor R1 and then is converted into heat.
In one embodiment, the resistor R1 is a power resistor to ensure reliability.
In one embodiment, the surge interference protection circuit further comprises:
the millisecond-level surge detection circuit is connected with the instantaneous peak voltage absorption module in parallel and used for detecting the duration time of a surge waveform voltage in the input voltage and generating a second energy conversion control signal when the duration time reaches a preset millisecond-level threshold value;
and the control port of the ground energy release circuit is connected with the millisecond-level surge detection circuit and is used for receiving the second energy conversion control signal and acting according to the second energy conversion control signal so as to guide part of surge energy into the ground.
In the surge interference protection circuit in the above embodiment, for a surge waveform voltage interference signal generally at millisecond level, the energy of the surge interference signal is far greater than the tolerable range of the circuit and the LDM itself, and the energy of the surge needs to be directly discharged to the ground to ensure that the energy does not enter the back-end circuit to cause damage. Since the energy to be discharged is very large, if the impedance of the discharging circuit itself is not low enough, the risk of insufficient discharging and self-heating burning is caused, so the discharging circuit needs extremely low impedance and current-resistant electric heating capability. At the moment, the host machine has the requirement on the surge interference signal that the LDM and the LED are not damaged but can close the output, so that the surge energy can be fully discharged only by ensuring.
In one embodiment, the millisecond-level surge detection circuit comprises a resistor R3 and a capacitor C3 which are connected in series, wherein the input end of the resistor R3 is connected with the anode of the first voltage regulator tube, and the cathode of the capacitor C3 is connected with the cathode of the capacitor C2;
the energy leakage circuit comprises a field effect transistor Q2 and a second voltage-regulator tube, wherein the source electrode of the field effect transistor Q2 is used for being connected with an anode voltage input port, the drain electrode of the field effect transistor Q2 is connected with the cathode of the capacitor C3, the grid electrode of the field effect transistor Q2 is connected with the anode of the capacitor C3, the cathode of the second voltage-regulator tube is connected with the grid electrode of the field effect transistor Q2, and the anode of the second voltage-regulator tube is connected with the cathode of the capacitor C3;
wherein the time of RC charging of the millisecond-level surge detection circuit is configured to be in milliseconds.
In the surge interference protection circuit in the above embodiment, the turn-on voltage of the first voltage regulator tube may be set to be greater than the maximum value of the normal input voltage and smaller than the voltage regulation value of the voltage regulation module. When a surge interference signal is added, the voltage stabilizing module stabilizes voltage, the first voltage stabilizing tube is conducted, the resistor R3 and the capacitor C3 conduct RC charging, the RC charging time is set to be millisecond, and if the time of the surge interference waveform reaches the RC charging time, the field effect tube Q2 is conducted. The surge waveform energy is directed to the ground. The second regulator tube is used for protecting the field effect tube Q2 from high voltage breakdown.
In one embodiment, the fet Q2 is an NMOS transistor to improve heat dissipation and increase circuit stability.
In one embodiment, the transient spike voltage absorbing module comprises a transient voltage suppression diode, wherein a cathode of the transient voltage suppression diode is used for being connected with the positive voltage input port, and an anode of the transient voltage suppression diode is used for being grounded; and/or
The voltage stabilizing module comprises a voltage stabilizing capacitor, the positive electrode of the voltage stabilizing capacitor is used for being connected with the positive voltage input port, and the negative electrode of the voltage stabilizing capacitor is used for being grounded.
In the surge interference protection circuit in the above embodiment, the voltage stabilizing capacitor has the capability of preventing voltage from suddenly changing, the transient voltage suppression diode can absorb transient spike and the capability of stabilizing voltage, and the combination of the transient voltage suppression diode and the transient voltage suppression diode can ensure that the input of the back-end circuit is stable under the nanosecond-level surge waveform, so that the output is stable.
In one embodiment, the surge interference protection circuit further comprises:
and the DC-DC conversion circuit is connected with the instantaneous peak voltage absorption module in parallel and is used for converting the surge energy of microsecond level into low-voltage energy to be stored and output to a load for consumption.
In the surge interference protection circuit in the above embodiment, since the DC-DC conversion circuit is used as an energy conversion circuit, the DC-DC conversion circuit itself has a voltage-current conversion capability, and generally operates in the microsecond level, it can convert the surge high-voltage energy in the microsecond level into low-voltage energy to be stored and output to the load for consumption.
A second aspect of the present application provides a vehicle LED driving power supply, comprising a surge interference protection circuit as described in any of the embodiments of the present application; and
and the LED driving module is connected with the voltage output end of the voltage stabilizing module.
In the vehicle LED driving power supply in the above embodiment, the transient spike voltage absorbing module is arranged in series between the positive voltage input port and the ground to absorb the transient spike voltage in the input voltage; and a voltage stabilizing module is arranged to be connected in parallel with the instantaneous peak voltage absorbing module so as to output a stable voltage to a back-end circuit when a nanosecond-level surge waveform voltage exists in the input voltage. The surge interference protection circuit in the embodiment can keep the voltage input to the back-end circuit in a stable state, so that the normal voltage output of the circuit can be ensured without output fluctuation when nanosecond-level surge waveforms are received. The LDM of the vehicle can still stably work under the action of the instantaneous peak voltage interference signal.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain drawings of other embodiments based on these drawings without any creative effort.
Fig. 1 is a schematic circuit diagram of a surge interference protection circuit provided in a first embodiment of the present application.
Fig. 2 is a schematic circuit diagram of a surge interference protection circuit provided in a second embodiment of the present application.
Fig. 3 is a partial circuit diagram of a surge interference protection circuit provided in a third embodiment of the present application.
Fig. 4 is a schematic circuit diagram of a surge interference protection circuit provided in a fourth embodiment of the present application.
Fig. 5 is a partial circuit diagram of a surge interference protection circuit provided in a fifth embodiment of the present application.
Fig. 6 is a partial circuit diagram of a surge interference protection circuit provided in a sixth embodiment of the present application.
Fig. 7 is a circuit diagram of a surge interference protection circuit provided in a seventh embodiment of the present application.
Fig. 8 is a circuit diagram of a surge interference protection circuit provided in an eighth embodiment of the present application.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Where the terms "comprising," "having," and "including" are used herein, another element may be added unless an explicit limitation is used, such as "only," "consisting of … …," etc. Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application.
In this application, unless otherwise expressly stated or limited, the terms "connected" and "connecting" are used broadly and encompass, for example, direct connection, indirect connection via an intermediary, communication between two elements, or interaction between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1, in an embodiment of the present application, a surge interference protection circuit is provided, which includes an instantaneous peak voltage absorbing module 10 and a voltage stabilizing module 20, wherein the instantaneous peak voltage absorbing module 10 is connected in series between a positive voltage input port and ground to absorb an instantaneous peak voltage in an input voltage; the voltage stabilization module 20 is connected in parallel to the transient spike voltage absorbing module 10, and is configured to stabilize a voltage to output a stabilized voltage to a back-end circuit when a surge waveform voltage of nanosecond level exists in an input voltage.
Specifically, with continued reference to fig. 1, in the surge interference protection circuit in the above embodiment, the transient spike voltage absorbing module 10 is arranged in series between the positive voltage input port and the ground to absorb the transient spike voltage in the input voltage; and a voltage stabilization module 20 is provided in parallel with the transient spike voltage absorbing module 10 to output a stabilized voltage to a back-end circuit when a surge waveform voltage of nanosecond level exists in an input voltage. The surge interference protection circuit in the embodiment can keep the voltage input to the back-end circuit in a stable state, so that the normal voltage output of the circuit can be ensured without output fluctuation when nanosecond-level surge waveforms are received.
Further, referring to fig. 2, in an embodiment of the present application, the surge interference protection circuit further includes a microsecond surge detection circuit 30 and a surge energy conversion circuit 40, where the microsecond surge detection circuit 30 is connected in parallel with the transient spike voltage absorption module 10, and is configured to detect a duration of a surge waveform voltage in an input voltage, and generate a first energy conversion control signal when the duration reaches a preset microsecond threshold; the surge energy conversion circuit 40 is connected in parallel with the instantaneous peak voltage absorption module 10, and a control port of the surge energy conversion circuit 40 is connected with the microsecond surge detection circuit 30, and is configured to receive the first energy conversion control signal and act according to the first energy conversion control signal to convert part of surge energy into heat energy.
Specifically, with continued reference to fig. 2, in the surge interference protection circuit in the above embodiment, the microsecond surge detection circuit can start the surge energy conversion circuit when the time of the surge waveform reaches the microsecond level, and the surge energy conversion circuit converts the part of the surge energy into electric energy which can be used by the back-end circuit or other energy harmless to the module. The surge energy conversion circuit can ensure that the energy conversion outside the bearing range of the back-end circuit is realized, and meanwhile, the output is not closed due to insufficient power supply of the back-end circuit caused by excessive conversion.
Further, in a surge interference protection circuit provided in an embodiment of the present application, the microsecond surge detection circuit includes a first voltage regulator tube Z1 and a first time detection circuit connected in series, a cathode of the first voltage regulator tube is used for being connected to the positive voltage input port, the first time detection circuit includes a resistor R2 and a capacitor C2 connected in series, an input end of the resistor R2 is connected to an anode of the first voltage regulator tube, and a cathode of the capacitor C2 is used for being grounded; the surge energy conversion circuit comprises a triode Q1 and a resistor R1, the collector of the triode Q1 is connected with the cathode of the first voltage regulator tube through the resistor R1, the emitter of the triode Q1 is connected with the cathode of the capacitor C2, and the base of the triode Q1 is connected with the anode of the capacitor C2; wherein, the time of RC charging of the microsecond surge detection circuit is configured to be microsecond.
As an example, please refer to fig. 3, in a surge interference protection circuit provided in an embodiment of the present application, the microsecond surge detection circuit includes a first voltage regulator tube Z1 and a first time detection circuit connected in series, a cathode of the first voltage regulator tube is configured to be connected to an anode voltage input port, the first time detection circuit includes a resistor R2 and a capacitor C2 connected in series, an input end of the resistor R2 is connected to an anode of the first voltage regulator tube, and a cathode of the capacitor C2 is configured to be grounded; the surge energy conversion circuit comprises a triode Q1 and a resistor R1, wherein the collector of the triode Q1 is connected with the cathode of the first voltage regulator tube through the resistor R1, the emitter of the triode Q1 is connected with the cathode of the capacitor C2, and the base of the triode Q1 is connected with the anode of the capacitor C2; wherein, the time of RC charging of the microsecond surge detection circuit is configured to be microsecond.
In the surge interference protection circuit in the above embodiment, the turn-on voltage of the first voltage regulator tube may be set to be greater than the maximum value of the normal input voltage of the circuit and smaller than the regulated voltage value output by the voltage regulation module. When surge waveform voltage interference is added, the voltage stabilizing module stabilizes voltage, the first voltage stabilizing tube is conducted, the resistor R2 and the capacitor C2 carry out RC charging, the RC charging time is microsecond, if the surge waveform time reaches the RC charging time, the triode Q1 is conducted, and partial energy of surge flows through the resistor R1 and then is converted into heat.
Preferably, in an embodiment of the present application, the resistor R1 is a power resistor to ensure reliability.
Further, please refer to fig. 4, in an embodiment of the present application, in a surge protection circuit, the surge protection circuit further includes a millisecond-level surge detection circuit 50 and a ground energy release circuit 60, the millisecond-level surge detection circuit 50 is connected in parallel with the transient spike voltage absorbing module 10, and is configured to detect a duration time of a surge waveform voltage in an input voltage and generate a second energy conversion control signal when the duration time reaches a preset millisecond-level threshold; the opposite-energy leakage circuit 60 is connected in parallel with the transient spike voltage absorbing module 10, and a control port of the opposite-energy leakage circuit 60 is connected with the millisecond-level surge detecting circuit 50, and is used for receiving the second energy conversion control signal and acting according to the second energy conversion control signal to guide part of surge energy into the ground.
Specifically, with continued reference to fig. 4, in the surge interference protection circuit in the above embodiment, for the surge waveform voltage interference signal generally at the millisecond level, the energy of the surge interference signal is far greater than the tolerable range of the circuit and the LDM itself, and the energy of the surge needs to be directly discharged to the ground to ensure that the energy does not enter the back-end circuit to cause damage. Since the energy to be discharged is very large, if the impedance of the discharging circuit itself is not low enough, the risk of insufficient discharging and self-heating burning is caused, so the discharging circuit needs extremely low impedance and current-resistant electric heating capability. At the moment, the host machine has the requirement on the surge interference signal that the LDM and the LED are not damaged but can close the output, so that the surge energy can be fully discharged only by ensuring.
Further, referring to fig. 5, in a surge interference protection circuit provided in an embodiment of the present application, the millisecond-level surge detection circuit includes a resistor R3 and a capacitor C3 connected in series, an input end of the resistor R3 is connected to an anode of the first voltage regulator tube, and a cathode of the capacitor C3 is connected to a cathode of the capacitor C2; the energy leakage circuit comprises a field effect transistor Q2 and a second voltage-regulator tube, wherein the source electrode of the field effect transistor Q2 is used for being connected with an anode voltage input port, the drain electrode of the field effect transistor Q2 is connected with the cathode of the capacitor C3, the grid electrode of the field effect transistor Q2 is connected with the anode of the capacitor C3, the cathode of the second voltage-regulator tube is connected with the grid electrode of the field effect transistor Q2, and the anode of the second voltage-regulator tube is connected with the cathode of the capacitor C3; wherein the time of RC charging of the millisecond-level surge detection circuit is configured to be in milliseconds.
Specifically, with reference to fig. 5, in the surge interference protection circuit in the above embodiment, the turn-on voltage of the first regulator tube Z1 may be set to be greater than the maximum value of the normal input voltage and smaller than the regulated voltage value of the regulator module. When a surge interference signal is added, the voltage stabilizing module stabilizes voltage, the first voltage stabilizing tube is conducted, the resistor R3 and the capacitor C3 conduct RC charging, the RC charging time is set to be millisecond, and if the time of the surge interference waveform reaches the RC charging time, the field effect tube Q2 is conducted. The surge waveform energy is directed to the ground. The second regulator tube is used for protecting the field effect tube Q2 from high voltage breakdown.
Preferably, in an embodiment of the present application, the fet Q2 is an NMOS transistor, so as to improve heat dissipation capability and increase stability of the circuit.
Further, in a surge interference protection circuit provided in an embodiment of the present application, the transient spike voltage absorbing module includes a transient voltage suppression diode, a cathode of the transient voltage suppression diode is used for connecting with the positive voltage input port, and an anode of the transient voltage suppression diode is used for grounding; and/or the voltage stabilizing module comprises a voltage stabilizing capacitor, the positive electrode of the voltage stabilizing capacitor is used for being connected with the positive voltage input port, and the negative electrode of the voltage stabilizing capacitor is used for being grounded.
As an example, referring to fig. 6 and 7, the transient spike voltage absorbing module includes a transient voltage suppression diode (TRANSIENT VOLTAGE suppresor, TVS) having a cathode for connection to the positive voltage input port and an anode for connection to ground; the voltage stabilizing module comprises a voltage stabilizing capacitor C1, the positive pole of the voltage stabilizing capacitor C1 is used for being connected with the positive pole voltage input port, and the negative pole of the voltage stabilizing capacitor C1 is used for being grounded.
In the surge interference protection circuit in the above embodiment, since the voltage stabilizing capacitor has the capability of preventing voltage from suddenly changing, the transient voltage suppression diode can absorb the transient spike and the capability of stabilizing voltage, and the combination of the transient voltage suppression diode and the transient voltage suppression diode can ensure that the input of the back-end circuit is stable under the nanosecond-level surge waveform, so that the output is stable.
Further, referring to fig. 8, in an embodiment of the present application, a surge interference protection circuit further includes a DC-DC conversion circuit, where the DC-DC conversion circuit is connected in parallel with the transient spike voltage absorption module, and is configured to convert surge energy of a microsecond level into low-voltage energy to be stored and output to a load for consumption.
Specifically, in the surge interference protection circuit in the above embodiment, with continuing reference to fig. 8, since the DC-DC conversion circuit is used as an energy conversion circuit, which has a voltage-current conversion capability itself and generally operates in the microsecond level, it can convert the surge high-voltage energy in the microsecond level into low-voltage energy to be stored and output to the load for consumption.
Further, in an embodiment of the present application, there is provided a vehicle LED driving power supply, including the surge interference protection circuit and the LED driving module as described in any of the embodiments of the present application; the LED driving module is connected with the voltage output end of the voltage stabilizing module.
In the vehicle LED driving power supply in the above embodiment, the transient spike voltage absorbing module is arranged in series between the positive voltage input port and the ground to absorb the transient spike voltage in the input voltage; and a voltage stabilizing module is arranged to be connected in parallel with the instantaneous peak voltage absorbing module so as to output a stable voltage to a back-end circuit when a nanosecond-level surge waveform voltage exists in the input voltage. The surge interference protection circuit in the embodiment can keep the voltage input to the back-end circuit in a stable state, so that the normal voltage output of the circuit can be ensured without output fluctuation when nanosecond-level surge waveforms are received. The LDM of the vehicle can still stably work under the action of the instantaneous peak voltage interference signal.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A surge interference protection circuit, comprising:
the instantaneous peak voltage absorbing module is connected between the positive voltage input port and the ground in series to absorb instantaneous peak voltage in the input voltage;
the voltage stabilizing module is connected with the instantaneous peak voltage absorbing module in parallel and used for stabilizing voltage so as to output stable voltage to a rear end circuit when nanosecond-level surge waveform voltage exists in input voltage;
and the microsecond surge detection circuit is connected with the instantaneous peak voltage absorption module in parallel and is used for detecting the duration of the surge waveform voltage in the input voltage and generating a first energy conversion control signal when the duration reaches a preset microsecond threshold value.
2. The surge interference protection circuit of claim 1, further comprising:
and the surge energy conversion circuit is connected with the instantaneous peak voltage absorption module in parallel, and a control port of the surge energy conversion circuit is connected with the microsecond-level surge detection circuit and used for receiving the first energy conversion control signal and acting according to the first energy conversion control signal so as to convert part of surge energy into heat energy.
3. The surge interference protection circuit of claim 2,
the microsecond surge detection circuit comprises a first voltage-regulator tube and a first time detection circuit which are connected in series, wherein the cathode of the first voltage-regulator tube is used for being connected with the positive voltage input port, the first time detection circuit comprises a resistor R2 and a capacitor C2 which are connected in series, the input end of the resistor R2 is connected with the anode of the first voltage-regulator tube, and the cathode of the capacitor C2 is used for being grounded; and/or
The surge energy conversion circuit comprises a triode Q1 and a resistor R1, wherein the collector of the triode Q1 is connected with the cathode of the first voltage regulator tube through the resistor R1, the emitter of the triode Q1 is connected with the cathode of the capacitor C2, and the base of the triode Q1 is connected with the anode of the capacitor C2;
wherein, the time of RC charging of the microsecond surge detection circuit is configured to be microsecond.
4. The surge interference protection circuit of claim 3, wherein said resistor R1 is a power resistor.
5. The surge interference protection circuit of claim 3, further comprising:
the millisecond-level surge detection circuit is connected with the instantaneous peak voltage absorption module in parallel and used for detecting the duration time of a surge waveform voltage in the input voltage and generating a second energy conversion control signal when the duration time reaches a preset millisecond-level threshold value;
and the control port of the ground energy release circuit is connected with the millisecond-level surge detection circuit and is used for receiving the second energy conversion control signal and acting according to the second energy conversion control signal so as to guide part of surge energy into the ground.
6. The surge interference protection circuit of claim 5,
the millisecond-level surge detection circuit comprises a resistor R3 and a capacitor C3 which are connected in series, wherein the input end of the resistor R3 is connected with the anode of the first voltage regulator tube, and the cathode of the capacitor C3 is connected with the cathode of the capacitor C2;
the energy leakage circuit comprises a field effect transistor Q2 and a second voltage-regulator tube, wherein the source electrode of the field effect transistor Q2 is used for being connected with an anode voltage input port, the drain electrode of the field effect transistor Q2 is connected with the cathode of the capacitor C3, the grid electrode of the field effect transistor Q2 is connected with the anode of the capacitor C3, the cathode of the second voltage-regulator tube is connected with the grid electrode of the field effect transistor Q2, and the anode of the second voltage-regulator tube is connected with the cathode of the capacitor C3;
wherein the time of RC charging of the millisecond-level surge detection circuit is configured to be in milliseconds.
7. The surge interference protection circuit according to claim 6, wherein said field effect transistor Q2 is an NMOS transistor.
8. The surge interference protection circuit according to any of claims 1-7,
the transient spike voltage absorption module comprises a transient voltage suppression diode, wherein the cathode of the transient voltage suppression diode is used for being connected with the positive voltage input port, and the anode of the transient voltage suppression diode is used for being grounded; and/or
The voltage stabilizing module comprises a voltage stabilizing capacitor, the positive electrode of the voltage stabilizing capacitor is used for being connected with the positive voltage input port, and the negative electrode of the voltage stabilizing capacitor is used for being grounded.
9. The surge interference protection circuit according to any of claims 1-7, further comprising:
and the DC-DC conversion circuit is connected with the instantaneous peak voltage absorption module in parallel and is used for converting the surge energy of microsecond level into low-voltage energy to be stored and output to a load for consumption.
10. A vehicle LED driving power supply, characterized by comprising:
the surge interference protection circuit of any of claims 1-9; and
and the LED driving module is connected with the voltage output end of the voltage stabilizing module.
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| CN202021468424.8U CN212627155U (en) | 2020-07-23 | 2020-07-23 | Surge interference protection circuit and vehicle LED drive power supply |
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| CN202021468424.8U CN212627155U (en) | 2020-07-23 | 2020-07-23 | Surge interference protection circuit and vehicle LED drive power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865058A (en) * | 2021-04-12 | 2021-05-28 | 上海传泰电子科技有限公司 | High-voltage peak bleeder circuit |
| CN117220488A (en) * | 2023-11-08 | 2023-12-12 | 成都航天通信设备有限责任公司 | Power distribution system, on-vehicle power supply system and automobile |
| CN117834336A (en) * | 2023-12-29 | 2024-04-05 | 浙江康信电器集团有限公司 | Voltage stabilizing circuit applied to LIN communication of commercial vehicle and control method thereof |
-
2020
- 2020-07-23 CN CN202021468424.8U patent/CN212627155U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865058A (en) * | 2021-04-12 | 2021-05-28 | 上海传泰电子科技有限公司 | High-voltage peak bleeder circuit |
| CN117220488A (en) * | 2023-11-08 | 2023-12-12 | 成都航天通信设备有限责任公司 | Power distribution system, on-vehicle power supply system and automobile |
| CN117834336A (en) * | 2023-12-29 | 2024-04-05 | 浙江康信电器集团有限公司 | Voltage stabilizing circuit applied to LIN communication of commercial vehicle and control method thereof |
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