CN117096830A - DC input protection circuit - Google Patents
DC input protection circuit Download PDFInfo
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- CN117096830A CN117096830A CN202311076179.4A CN202311076179A CN117096830A CN 117096830 A CN117096830 A CN 117096830A CN 202311076179 A CN202311076179 A CN 202311076179A CN 117096830 A CN117096830 A CN 117096830A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1203—Circuits independent of the type of conversion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for DC applications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for DC systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The application relates to the field of direct current power supply, in particular to a direct current input protection circuit, which comprises: the device comprises an anti-reverse connection module, an interference filtering module, an overcurrent protection module, an overvoltage protection module, an undervoltage protection module and a switch module which are sequentially cascaded; the reverse connection preventing module is used for limiting the direction of the direct current input; the interference filtering module is used for filtering differential mode or common mode interference entering the protection circuit; the overcurrent protection module is used for limiting the magnitude of the direct current input; the overvoltage protection module is used for limiting the maximum value of the voltage of the direct current input; the undervoltage protection module is used for limiting the minimum value of the voltage of the direct current input; and the switch module is used for combining the outputs of the overcurrent protection module, the overvoltage protection module and the undervoltage protection module to determine whether the direct current input protection circuit outputs current or voltage. The application has the technical effects of low cost, simple circuit, good quality and insusceptibility to external environment.
Description
Technical Field
The application relates to the field of direct current power supplies, in particular to a direct current input protection circuit.
Background
At present, a switching power supply is widely applied in the electronic industry, but a power grid often fluctuates due to lightning stroke or load change and the like in a power system, voltage fluctuation (overvoltage or undervoltage) is brought to the switching power supply by the fluctuation of the power grid, interference in the power grid is also coupled to a secondary direct current power supply through a transformer, and the risk of direct current power supply reverse connection and overcurrent is also caused in the actual use of the switching power supply. The existing protection circuit has two schemes: 1. the voltage comparator chip builds an overcurrent protection voltage protection (overvoltage and undervoltage) circuit, and has the advantages of good stability and higher cost. 2. The voltage-stabilizing diode building circuit is used for overvoltage and undervoltage protection, and is easy to be influenced by external environment due to low temperature stability and current stability of the voltage-stabilizing diode although the cost is low.
Disclosure of Invention
The application provides a direct current input protection circuit which has low cost, simple circuit, good quality and difficult influence by external environment.
The application provides a direct current input protection circuit, which adopts the following technical scheme:
in a first aspect, a dc input protection circuit is provided, including: the device comprises an anti-reverse connection module, an interference filtering module, an overcurrent protection module, an overvoltage protection module, an undervoltage protection module and a switch module which are sequentially cascaded;
the reverse connection preventing module is used for limiting the direction of the direct current input;
the interference filtering module is used for filtering differential mode or common mode interference entering the protection circuit;
the overcurrent protection module is used for limiting the magnitude of the direct current input;
the overvoltage protection module is used for limiting the maximum value of the voltage of the direct current input;
the undervoltage protection module is used for limiting the minimum value of the voltage of the direct current input;
and the switch module is used for combining the outputs of the overcurrent protection module, the overvoltage protection module and the undervoltage protection module to determine whether the direct current input protection circuit outputs current or voltage.
Preferably, the reverse connection preventing module includes: diode D1.
Preferably, the interference filtering module includes: a bi-directional TVS tube, a common mode inductor, magnetic beads, and/or a capacitor C1 that are cascaded together.
Preferably, the overcurrent protection module includes: a power supply terminal VDD, a ground terminal GND, a first resistor R1, a fifth resistor R5, a seventh resistor R7, a second transistor Q2 and a fourth transistor Q4; the second triode Q2 is a PNP tube, and the fourth triode Q4 is an NPN tube;
the first resistor R1 is connected between the base electrode and the emitter electrode of the second triode Q2 in a bridging mode, one end of the first resistor R1 is connected with the output end of the interference filtering module, and the other end of the first resistor R1 is connected with the power supply end VDD; the collector electrode of the second triode Q2 is connected to the ground end GND through a fifth resistor R5 and a seventh resistor R7 which are sequentially connected in series;
the junction of the fifth resistor R5 and the seventh resistor R7 is also connected with the base electrode of the fourth triode Q4; the emitter of the fourth triode Q4 is connected to the ground end GND, and the collector of the fourth triode Q4 is used as the output end of the overcurrent protection module and is connected with the switch module.
Preferably, the overvoltage protection module comprises: the second resistor R2, the eighth resistor R8 and the fifth triode Q5; the fifth triode Q5 is an NPN tube;
the second resistor R2 and the eighth resistor R8 are connected in series and are connected between the power supply end VDD and the ground end GND in a bridging manner; the junction of the second resistor R2 and the eighth resistor R8 is also connected with the base electrode of the fifth triode Q5; the emitter of the fifth triode Q5 is connected to the ground end GND, and the collector of the fifth triode Q5 is used as the output end of the overvoltage protection module and is connected with the switch module.
Preferably, the undervoltage protection module includes: a third resistor R3 and a sixth resistor R6; the third resistor R3 and the sixth resistor R6 are connected in series and are connected between the power supply end VDD and the ground end GND in a bridging manner; and the junction of the third resistor R3 and the sixth resistor R6 is used as the output end of the undervoltage protection module and is connected with the switch module.
Preferably, the switch module includes: the output end OUT, the fourth resistor R4, the first field effect transistor Q1 and the third triode Q3; the first field effect transistor Q1 is an NMOS transistor, and the third triode Q3 is an NPN transistor;
the fourth resistor R is connected between the grid electrode and the source electrode of the first field effect transistor Q1 in a bridging mode; the source electrode of the first field effect transistor Q1 is also connected with a power supply end VDD, the drain electrode of the first field effect transistor Q1 is connected with the output end OUT, and the grid electrode of the first field effect transistor Q1 is connected with the collector electrode of the third triode Q3; the emitter of the third triode Q3 is connected with the ground end GND, and the base of the third triode Q3 is connected with the output end of the overcurrent protection module.
Preferably, the base electrode of the third triode Q3 is further connected to the output end of the overvoltage protection module.
Preferably, the base electrode of the third triode Q3 is further connected with the output end of the undervoltage protection module.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the reverse connection prevention, interference filtering, overvoltage protection, undervoltage protection and overcurrent protection can be realized, and compared with the existing various protection circuits, the protection circuit has stronger functions;
2. the protection circuit built by pure hardware has quicker response and better effect than the circuit built by MCU;
3. compared with a protection circuit built by an MCU or a comparator, the cost is lower, and the requirement on layout space is lower;
4. compared with a protection circuit built by a voltage stabilizing tube, the resistor voltage dividing mode has better stability to current and temperature.
Drawings
Fig. 1 is a logic configuration diagram of a dc input protection circuit;
FIG. 2 is a diagram of an embodiment of a DC input protection circuit;
reference numerals illustrate: 1. an anti-reverse connection module; 2. an interference filtering module; 3. an overcurrent protection module; 4. an overvoltage protection module; 5. an undervoltage protection module; 6. and a switch module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to fig. 1 to 2 and the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Term interpretation:
differential mode interference: it refers to the interference voltage or current on two wires (such as signal positive and negative electrodes) transmitting signals, and is characterized by opposite amplitudes and phases on the two wires. Differential mode interference is mainly caused by mismatch between signal sources, transmission lines or receivers, crosstalk or power supply fluctuations, etc. Differential mode interference can have an interfering effect on the normal transmission of differential mode signals.
Common mode interference: the interference voltage or current applied to two wires for transmitting signals simultaneously is characterized in that the amplitude and the phase of the two wires are the same. Common mode interference is mainly caused by electromagnetic radiation, grounding problems, power supply fluctuation, external electromagnetic interference and other factors. Common mode interference also has an interfering effect on the normal transmission of differential mode signals.
In particular, the method comprises the steps of,
in a first aspect, as shown in fig. 1, there is provided a dc input protection circuit, including: the device comprises an anti-reverse connection module, an interference filtering module, an overcurrent protection module, an overvoltage protection module, an undervoltage protection module and a switch module which are sequentially cascaded;
the reverse connection preventing module 1 is used for limiting the direction of the current input by direct current; in the present embodiment, the diodes of the respective withstand voltages are selected according to the difference in input voltage.
The interference filtering module 2 is used for filtering differential mode or common mode interference entering the protection circuit;
the overcurrent protection module 3 is used for limiting the magnitude of the direct-current input current; if the current of the direct current input protection circuit is too large, the overcurrent protection module outputs a value to enable the switch module to switch off the direct current input protection circuit, so that the current entering the direct current input protection circuit cannot flow out.
An overvoltage protection module 4 for limiting the maximum value of the voltage of the direct current input; if the voltage input into the direct current input protection circuit is overlarge and exceeds the preset maximum voltage, the overvoltage protection module outputs a value to enable the switch module to switch off the direct current input protection circuit, so that the direct current input protection circuit does not output voltage any more.
The undervoltage protection module 5 is used for limiting the minimum value of the voltage of the direct current input; if the voltage input into the direct current input protection circuit is too small, namely in an under-voltage state and is smaller than the minimum value of the preset voltage, the under-voltage protection module outputs a value, so that the switch module turns off the direct current input protection circuit, and the direct current input protection circuit does not output voltage any more.
And the switch module 6 is used for combining the outputs of the overcurrent protection module, the overvoltage protection module and the undervoltage protection module to determine whether the direct current input protection circuit outputs current or voltage. The method can also be used for independently depending on the output of the overcurrent protection module to determine whether the direct current input protection circuit outputs current or not; the direct current input protection circuit can be used for independently determining whether the direct current input protection circuit outputs voltage or not by means of the overvoltage protection module; the direct current input protection circuit can be used for independently determining whether the direct current input protection circuit outputs voltage or not by means of the undervoltage protection module.
Preferably, as shown in fig. 2, the anti-reverse connection module includes: diode D1. The diode is a unidirectional conducting device. The anode of the diode D1 is connected to the input power dc+ and the cathode of the diode D1 is connected to the input of the subsequent interference filtering module. The dc+ may have an overcurrent, overvoltage, and undervoltage, and therefore, an overcurrent protection module, an overvoltage protection module, and an undervoltage protection module are required. The power supply end VDD is a DC power supply end provided to compensate for the loss of dc+ in the subsequent circuit, and is used to ensure the normal operation of the overcurrent protection module, overvoltage protection module, and undervoltage protection module.
Preferably, the interference filtering module includes: a bi-directional TVS tube, a common mode inductor, magnetic beads, and/or a capacitor C1 that are cascaded together. TVS tubes are an electronic device for circuit protection, collectively Transient Voltage Suppressor (transient voltage suppressor), which is used in circuits to provide overvoltage protection against excessive voltages due to voltage spikes, lightning strikes, inductive collapse or other transient events, protecting other sensitive electronic components or equipment from damage. The common mode inductance (Common Mode Inductor) is an inductance element for suppressing common mode interference. The capacitor C1 functions as a filter. In this embodiment, the TVS tube is D2. The common mode inductance is L1. The magnetic beads are FB1 and FB2.
Preferably, the overcurrent protection module includes: a power supply terminal VDD, a ground terminal GND, a first resistor R1, a fifth resistor R5, a seventh resistor R7, a second transistor Q2 and a fourth transistor Q4; the second triode Q2 is a PNP tube, and the fourth triode Q4 is an NPN tube;
the first resistor R1 is connected between the base electrode and the emitter electrode of the second triode Q2 in a bridging mode, one end of the first resistor R1 is connected with the output end of the interference filtering module, and the other end of the first resistor R1 is connected with the power supply end VDD; the collector electrode of the second triode Q2 is connected to the ground end GND through a fifth resistor R5 and a seventh resistor R7 which are sequentially connected in series;
the junction of the fifth resistor R5 and the seventh resistor R7 is also connected with the base electrode of the fourth triode Q4; the emitter of the fourth triode Q4 is connected to the ground end GND, and the collector of the fourth triode Q4 is used as the output end of the overcurrent protection module and is connected with the switch module.
The working principle of the overcurrent protection module is as follows: when the current flowing through the first resistor R1 reaches a preset current value, the voltage at two ends of the first resistor R1, that is, the voltage of the second triode Q2 is greater than 0.7v, the second triode Q2 enters a saturation region, and the voltage of the collector of the second triode Q2 can be approximately regarded as being close to zero voltage; no current flows between the collector of the second transistor Q2 and the ground GND, resulting in zero volts at the collector of the fourth transistor Q4; at this time, no matter what working state the overvoltage protection module or the undervoltage protection module is in, the input of the switch module is low level; the first field effect transistor Q1 is in an off state, that is, the current flowing through the overcurrent protection module is greater than the preset current value, the switch module turns off the dc input protection circuit, so that the excessive current does not flow to the output end of the dc input protection circuit and enters the next stage circuit. In the present embodiment, if the limit of the overcurrent is 200mA, it is possible to obtain that the resistance value of the first resistor R1 is 0.7++200=3.5Ω. The first resistor R1 is 3.5 Ω, and then the fourth transistor Q4 can be turned on, the fifth resistor R5 is 10kΩ, and the seventh resistor R7 is 100kΩ.
Preferably, the overvoltage protection module comprises: the second resistor R2, the eighth resistor R8 and the fifth triode Q5; the fifth triode Q5 is an NPN tube;
the second resistor R2 and the eighth resistor R8 are connected in series and are connected between the power supply end VDD and the ground end GND in a bridging manner; the junction of the second resistor R2 and the eighth resistor R8 is also connected with the base electrode of the fifth triode Q5; the emitter of the fifth triode Q5 is connected to the ground end GND, and the collector of the fifth triode Q5 is used as the output end of the overvoltage protection module and is connected with the switch module.
Working principle of overvoltage protection module: the fifth triode Q5 is an NPN tube; when the voltage of the eighth resistor R8 is greater than 0.7V, that is, the voltage of the base and the emitter of the fifth transistor Q5 is greater than 0.7V, the fifth transistor Q5 enters the on state. In this case, the collector voltage (Vce) will remain relatively low, typically close to the saturation voltage; the voltage at the collector can be considered approximately near zero voltage. The output value of the overvoltage protection module is low no matter what the output values of the overcurrent protection module and the undervoltage protection module are, so that the first field effect transistor of the switch module is in an off state, namely the input voltage of the overvoltage protection module is larger than the maximum voltage value of a preset value, the switch module can turn off the direct current input protection circuit, so that the excessive voltage cannot be output from the direct current input protection circuit and enter the next stage of circuit. In the present embodiment, the output OUT voltage is 11V (±1v).
Then 12v× (R8/(r2+r8))=0.7v, where the second resistor R2 is 161kΩ and the eighth resistor R8 is 10kΩ.
Preferably, the undervoltage protection module includes: a third resistor R3 and a sixth resistor R6; the third resistor R3 and the sixth resistor R6 are connected in series and are connected between the power supply end VDD and the ground end GND in a bridging manner; and the junction of the third resistor R3 and the sixth resistor R6 is used as the output end of the undervoltage protection module and is connected with the switch module.
The working principle of the undervoltage protection module is as follows: when the voltage entering the under-voltage protection module is smaller than the preset voltage value, the voltage at two ends of the sixth resistor R6 is smaller, namely the output of the under-voltage protection module is in a low level, so that the third triode Q3 is in a cut-off state; no matter what state the overvoltage protection module is in at this time, the first field effect transistor Q1 in the switching module is in an off state, i.e. no voltage is output from the dc input protection circuit. In the present embodiment, the output OUT voltage is 11V (±1v). Then, if 10v× (R6/(r3+r6))=0.7v, the third resistor R3 may be 132kΩ, and the sixth resistor R6 may be 10kΩ.
Preferably, the switch module includes: the output end OUT, the fourth resistor R4, the first field effect transistor Q1 and the third triode Q3; the first field effect transistor Q1 is an NMOS transistor, and the third triode Q3 is an NPN transistor;
the fourth resistor R is connected between the grid electrode and the source electrode of the first field effect transistor Q1 in a bridging mode; the source electrode of the first field effect transistor Q1 is also connected with a power supply end VDD, the drain electrode of the first field effect transistor Q1 is connected with the output end OUT, and the grid electrode of the first field effect transistor Q1 is connected with the collector electrode of the third triode Q3; the emitter of the third triode Q3 is connected with the ground end GND, and the base of the third triode Q3 is connected with the output end of the overcurrent protection module.
The working principle of the switch module is as follows: when the base of the third transistor Q3 is at a low level, the third transistor Q3 also has a cut-off region, and therefore, the voltage between the two ends of the fourth resistor R4, that is, the gate and the source of the first field effect transistor Q1, is zero volt. When the first field effect transistor Q1 in the switch module is a PMOS transistor, the PMOS transistor is in a turned-off state, which is also called a turned-off state, when the voltages of the gate and the source of the PMOS transistor are equal. I.e. the switching module is in an off state. In summary, no matter which one of the overcurrent protection module, the overvoltage protection module and/or the undervoltage protection module outputs, the switch module is in the off state, and no current or no voltage is output to the next stage circuit.
Preferably, the base electrode of the third triode Q3 is further connected to the output end of the overvoltage protection module.
Preferably, the base electrode of the third triode Q3 is further connected with the output end of the undervoltage protection module.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the reverse connection prevention, interference filtering, overvoltage protection, undervoltage protection and overcurrent protection can be realized, and compared with the existing various protection circuits, the protection circuit has stronger functions;
2. the protection circuit built by pure hardware has quicker response and better effect than the circuit built by MCU;
3. compared with a protection circuit built by an MCU or a comparator, the cost is lower, and the requirement on layout space is lower;
4. compared with a protection circuit built by a voltage stabilizing tube, the resistor voltage dividing mode has better stability to current and temperature.
The foregoing description of the preferred embodiments of the application is not intended to limit the scope of the application in any way, including the abstract and drawings, in which case any feature disclosed in this specification (including abstract and drawings) may be replaced by alternative features serving the same, equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Claims (9)
1. A dc input protection circuit, comprising: the device comprises an anti-reverse connection module, an interference filtering module, an overcurrent protection module, an overvoltage protection module, an undervoltage protection module and a switch module which are sequentially cascaded;
the reverse connection preventing module is used for limiting the direction of the direct current input;
the interference filtering module is used for filtering differential mode or common mode interference entering the protection circuit;
the overcurrent protection module is used for limiting the magnitude of the direct current input;
the overvoltage protection module is used for limiting the maximum value of the voltage of the direct current input;
the undervoltage protection module is used for limiting the minimum value of the voltage of the direct current input;
and the switch module is used for combining the outputs of the overcurrent protection module, the overvoltage protection module and the undervoltage protection module to determine whether the direct current input protection circuit outputs current or voltage.
2. The direct current input protection circuit of claim 1, wherein the anti-reverse connection module comprises: diode D1.
3. The dc input protection circuit of claim 1, wherein the interference filtering module comprises: a bi-directional TVS tube, a common mode inductor, magnetic beads, and/or a capacitor C1 that are cascaded together.
4. The direct current input protection circuit of claim 1, wherein the over-current protection module comprises: a power supply terminal VDD, a ground terminal GND, a first resistor R1, a fifth resistor R5, a seventh resistor R7, a second transistor Q2 and a fourth transistor Q4; the second triode Q2 is a PNP tube, and the fourth triode Q4 is an NPN tube;
the first resistor R1 is connected between the base electrode and the emitter electrode of the second triode Q2 in a bridging mode, one end of the first resistor R1 is connected with the output end of the interference filtering module, and the other end of the first resistor R1 is connected with the power supply end VDD; the collector electrode of the second triode Q2 is connected to the ground end GND through a fifth resistor R5 and a seventh resistor R7 which are sequentially connected in series;
the junction of the fifth resistor R5 and the seventh resistor R7 is also connected with the base electrode of the fourth triode Q4; the emitter of the fourth triode Q4 is connected to the ground end GND, and the collector of the fourth triode Q4 is used as the output end of the overcurrent protection module and is connected with the switch module.
5. The direct current input protection circuit of claim 4, wherein the overvoltage protection module comprises: the second resistor R2, the eighth resistor R8 and the fifth triode Q5; the fifth triode Q5 is an NPN tube;
the second resistor R2 and the eighth resistor R8 are connected in series and are connected between the power supply end VDD and the ground end GND in a bridging manner; the junction of the second resistor R2 and the eighth resistor R8 is also connected with the base electrode of the fifth triode Q5; the emitter of the fifth triode Q5 is connected to the ground end GND, and the collector of the fifth triode Q5 is used as the output end of the overvoltage protection module and is connected with the switch module.
6. The dc input protection circuit of claim 5, wherein the undervoltage protection module comprises: a third resistor R3 and a sixth resistor R6; the third resistor R3 and the sixth resistor R6 are connected in series and are connected between the power supply end VDD and the ground end GND in a bridging manner; and the junction of the third resistor R3 and the sixth resistor R6 is used as the output end of the undervoltage protection module and is connected with the switch module.
7. The direct current input protection circuit of claim 6, wherein the switch module comprises: the output end OUT, the fourth resistor R4, the first field effect transistor Q1 and the third triode Q3; the first field effect transistor Q1 is an NMOS transistor, and the third triode Q3 is an NPN transistor;
the fourth resistor R is connected between the grid electrode and the source electrode of the first field effect transistor Q1 in a bridging mode; the source electrode of the first field effect transistor Q1 is also connected with a power supply end VDD, the drain electrode of the first field effect transistor Q1 is connected with the output end OUT, and the grid electrode of the first field effect transistor Q1 is connected with the collector electrode of the third triode Q3; the emitter of the third triode Q3 is connected with the ground end GND, and the base of the third triode Q3 is connected with the output end of the overcurrent protection module.
8. The direct current input protection circuit according to claim 7, wherein the base of the third transistor Q3 is further connected to the output terminal of the overvoltage protection module.
9. The dc input protection circuit of claim 8, wherein the base of the third transistor Q3 is further coupled to the output of the under-voltage protection module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311076179.4A CN117096830A (en) | 2023-08-24 | 2023-08-24 | DC input protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311076179.4A CN117096830A (en) | 2023-08-24 | 2023-08-24 | DC input protection circuit |
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| CN117096830A true CN117096830A (en) | 2023-11-21 |
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| CN202311076179.4A Pending CN117096830A (en) | 2023-08-24 | 2023-08-24 | DC input protection circuit |
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| WO2025156468A1 (en) * | 2024-01-23 | 2025-07-31 | 广州汽车集团股份有限公司 | Vehicle-mounted high-side driver control circuit and vehicle |
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Application publication date: 20231121 |