CN212462818U - Direct current protection control circuit - Google Patents
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- CN212462818U CN212462818U CN202020867918.7U CN202020867918U CN212462818U CN 212462818 U CN212462818 U CN 212462818U CN 202020867918 U CN202020867918 U CN 202020867918U CN 212462818 U CN212462818 U CN 212462818U
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Abstract
The utility model discloses a direct current protection control circuit is connected with input power supply and switch module, direct current protection control circuit includes direct current protection unit and level transition unit, by direct current protection unit detects input power supply and exports first control signal extremely according to the testing result level transition unit, by level transition unit basis first control signal carries out level transition and exports to switch module. The utility model discloses a direct current protection unit monitors input power to carry out level conversion through level conversion unit according to the monitoring result, make the control level of direct current protection unit output can adjust in a flexible way, use with the different switch module of collocation.
Description
Technical Field
The utility model relates to a power supply protection field, in particular to direct current protection control circuit.
Background
In the electronic product that uses DC power supply, there are multiple supply voltage and interface, same interface also has different voltages, if general DC power supply adapter has 12V, 9V, 5V power supply, freight train and car storage battery are 24V and 12V power supply respectively, consider from product safety protection, need carry out DC power supply input to this type of electronic product and cross undervoltage protection, internal damage appears for preventing the product mistake to insert high voltage power, two lead to inside device power too high to generate heat to appear the potential safety hazard for preventing the product mistake to insert low voltage power, last point provides undervoltage protection for the electronic product of built-in rechargeable battery, break off the load when the battery power is not enough, prevent that the battery from excessively discharging and influencing battery life.
At present, a plurality of direct current protection integrated chips are available on the market, but the output levels of the chips are not adjustable, and the chips cannot be applied to various circuits.
Thus, the prior art has yet to be improved and enhanced.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing prior art, an object of the present invention is to provide a dc protection control circuit, which monitors an input power through an overvoltage monitoring circuit and an under-voltage monitoring circuit, and performs level conversion through a level conversion unit according to a monitoring result, so that an output control level of the under-voltage monitoring circuit can be flexibly adjusted to be used by different switch modules in collocation.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a direct current protection control circuit is connected with an input power supply and a switch module and comprises an overvoltage monitoring circuit, an undervoltage monitoring circuit and a level switching unit, wherein the overvoltage monitoring circuit or the undervoltage monitoring circuit detects the input power supply and outputs a first control signal to the level switching unit according to a detection result, and the level switching unit performs level switching according to the first control signal and outputs the first control signal to the switch module.
The direct current protection unit comprises an overvoltage protection circuit and an undervoltage protection circuit.
The overvoltage monitoring circuit includes:
the first voltage-stabilizing tube is used for setting an overvoltage set value;
the first resistor and the second resistor are used for current-limiting protection of the first voltage regulator tube;
the first triode is used for outputting a control signal according to the detection result;
the output end of the first voltage-regulator tube is connected with the input power supply, the undervoltage monitoring circuit and the level conversion unit, the input end of the first voltage-regulator tube is connected with one end of a first resistor and one end of a second resistor, the other end of the first resistor is connected with the base electrode of the first triode, the collector electrode of the first triode is connected with the undervoltage monitoring circuit and the level conversion unit, and the other end of the second resistor and the emitter electrode of the first triode are grounded.
The brown-out monitoring circuit includes:
the second voltage-regulator tube is used for setting an under-voltage set value;
a third resistor and a fourth resistor for setting a high level voltage range;
the output end of the second voltage-stabilizing tube is connected with an input power supply, the output end of the first voltage-stabilizing tube and the level conversion unit, the input end of the second voltage-stabilizing tube is connected with one end of the third resistor, the other end of the third resistor is connected with one end of the fourth resistor, and the other end of the fourth resistor is grounded.
The level conversion unit comprises a fifth resistor, a sixth resistor and a second triode, one end of the fifth resistor is connected with the output end of the second voltage-regulator tube, the output end of the first voltage-regulator tube and an input power supply, the other end of the fifth resistor is connected with a collector of the second triode, one end of the sixth resistor and a switch module, a base of the second triode is connected with the other end of the third resistor, one end of the fourth resistor and the collector of the first triode, and an emitting electrode of the second triode and the other end of the sixth resistor are grounded.
In an alternative embodiment, the dc protection unit includes an over-voltage protection circuit or an under-voltage protection circuit.
The overvoltage monitoring circuit includes:
the first voltage-stabilizing tube is used for setting an overvoltage set value;
the first resistor and the second resistor are used for current-limiting protection of the first voltage regulator tube;
the first triode is used for outputting a control signal according to the detection result;
a seventh resistor for providing a pull-up voltage;
the output end of the first voltage-regulator tube is connected with the input power supply, one end of a seventh resistor and the level conversion unit, the input end of the first voltage-regulator tube is connected with one end of the first resistor and one end of a second resistor, the other end of the first resistor is connected with the base electrode of the first triode, the collector electrode of the first triode is connected with the other end of the seventh resistor and the level conversion unit, and the other end of the second resistor and the emitter electrode of the first triode are both grounded.
The level conversion unit comprises a fifth resistor and a second triode, one end of the fifth resistor is connected with the output end of the first voltage regulator tube, one end of the seventh resistor, the input power supply and the switch module, the other end of the fifth resistor is connected with the collector electrode of the second triode and the switch module, the base electrode of the second triode is connected with the other end of the seventh resistor and the collector electrode of the first triode, and the emitter electrode of the second triode is grounded.
The brown-out monitoring circuit includes:
the second voltage-regulator tube is used for setting an under-voltage set value;
a third resistor and a fourth resistor for setting a high level voltage range;
the output end of the second voltage-stabilizing tube is connected with an input power supply and a level conversion unit, the input end of the second voltage-stabilizing tube is connected with one end of the third resistor, the other end of the third resistor is connected with one end of the fourth resistor, and the other end of the fourth resistor is grounded.
The level conversion unit comprises a fifth resistor and a second triode, one end of the fifth resistor is connected with the output end of the second voltage regulator tube and the input power supply, the other end of the fifth resistor is connected with a collector of the second triode and the switch module, a base of the second triode is connected with the other end of the third resistor and one end of the fourth resistor, and an emitter of the second triode is grounded.
Compared with the prior art, the utility model provides a direct current protection control circuit is connected with input power and switch module, direct current protection control circuit includes direct current protection unit and level transition unit, by direct current protection unit detects input power and exports first control signal extremely according to the testing result level transition unit, by level transition unit basis first control signal carries out level transition and exports to switch module. The utility model discloses a direct current protection unit monitors input power to carry out level conversion through level conversion unit according to the monitoring result, make the control level of direct current protection unit output can adjust in a flexible way, use with the different switch module of collocation.
Drawings
Fig. 1 is a functional block diagram of the dc protection control circuit provided by the present invention;
fig. 2 is a circuit diagram according to a first embodiment of the present invention;
fig. 3 is a circuit diagram of a second embodiment of the present invention;
fig. 4 is a circuit diagram of a third embodiment of the present invention.
Detailed Description
In view of the problem among the prior art, the utility model provides a direct current protection control circuit, monitor input power through the direct current protection unit to carry out level conversion through the level transition unit according to the monitoring result, make the control level of direct current protection unit output can adjust in a flexible way, use with the different switch module of collocation.
The present invention is described in more detail in order to facilitate the explanation of the technical idea, the technical problem solved, the technical features of the technical solution, and the technical effects brought by the present invention. The description of the embodiments is not intended to limit the scope of the present invention. Further, the technical features of the embodiments described below may be combined with each other as long as they do not conflict with each other.
In view of the problem of non-adjustable output level in the prior art, referring to fig. 1, the present invention provides a dc protection control circuit, connected to an input POWER 50 and a switch module 40, including a dc protection unit 10, an overvoltage monitoring circuit 110, an undervoltage monitoring circuit 120, and a level conversion unit 30, in this embodiment, the dc protection unit 10, the overvoltage monitoring circuit 110, the undervoltage monitoring circuit 120, detects the voltage of the input POWER 50 in real time, and outputs a first control signal POWER-EN to the level conversion unit 30 according to the detection result. The input power supply is monitored by the direct current protection unit 10, and level conversion is performed by the level conversion unit according to the monitoring result, so that the control level output by the direct current protection unit 10 can be flexibly adjusted to be matched with different switch modules for use. Under-voltage monitoring circuit 120
Example one
Specifically, referring to fig. 1, the dc protection unit 10 includes an overvoltage protection circuit and an undervoltage protection circuit. The overvoltage monitoring circuit presets an overvoltage setting value, and the undervoltage monitoring circuit 120 presets an undervoltage setting value, and simultaneously the overvoltage setting value is higher than the undervoltage setting value.
When the voltage of the input POWER supply 50 is detected to be greater than the overvoltage set value, outputting a first control signal POWER-EN of a low level to the level conversion unit 30; when the voltage of the input POWER supply 50 is detected to be smaller than the overvoltage set value and larger than the undervoltage set value, outputting a first control signal POWER-EN of a high level to the level conversion unit 30; in addition, when the voltage of the input POWER 50 is detected to be less than the under-voltage setting value, the first control signal POWER-EN of low level is output to the level shift unit 30. The level shift unit 30 converts the low level into the high level and outputs the high level to the switch module 40 when receiving the first control signal POWER-EN of the low level, and converts the high level into the low level and outputs the low level to the switch module 40 when receiving the first control signal POWER-EN of the high level. The utility model discloses an excessive pressure monitoring circuit 110 and under-voltage monitoring circuit 120 monitor input power supply 50 to carry out level conversion through level shift unit 30 according to the monitoring result, make excessive pressure monitoring circuit 110 and under-voltage monitoring circuit 120 output control level can adjust in a flexible way, use with the different switch module 40 of collocation.
It should be noted that, when the control of the switch module can be realized by the first control signal, the first control signal can be directly output to the switch module without performing level conversion.
Further, referring to fig. 2, the input power source 50, the overvoltage monitoring circuit 110, the undervoltage monitoring circuit 120 and the level shift unit 30 are connected in sequence. In the embodiment, the voltage monitoring circuit 120 detects the voltage state of the input power supply 50 in real time, and the overvoltage monitoring circuit 110 is combined to realize voltage control in a certain range and realize level conversion so as to adapt to various types of power supply circuits.
Specifically, the overvoltage monitoring circuit 110 includes: a first zener ZD1 for setting an overpressure set point; a first resistor R1 and a second resistor R2 for current limiting protection of the first voltage regulator tube ZD 1; a first triode Q1 for outputting a control signal according to the detection result; the output end of the first voltage-regulator tube ZD1 is connected with the input power supply 50, the undervoltage monitoring circuit 120 and the level conversion unit 30, the input end of the first voltage-regulator tube ZD1 is connected with one end of a first resistor R1 and one end of a second resistor R2, the other end of the first resistor R1 is connected with the base electrode of the first triode, the collector electrode of the first triode Q1 is connected with the undervoltage monitoring circuit 120 and the level conversion unit 30, and the other end of the second resistor R2 and the emitter electrode of the first triode Q1 are all grounded.
The voltage regulator tube is a semiconductor device with high resistance until the critical reverse breakdown voltage, and when the voltage regulator tube is in reverse breakdown, the terminal voltage is almost unchanged in a certain current range (or a certain power loss range), so that the voltage regulator tube shows voltage-stabilizing characteristics. According to the voltage stabilizing characteristic of the voltage stabilizing tube, the reverse breakdown voltage of the first voltage stabilizing tube ZD1 is set to be an overvoltage set value (16V in the embodiment), and when the voltage of the input power supply 50 is greater than the overvoltage set value of the first voltage stabilizing tube ZD1, the first voltage stabilizing tube ZD1 is reversely broken down and clamped within a certain range of the overvoltage set value. The first resistor R1 and the second resistor R2 are connected in parallel to the first voltage regulator tube ZD1, and are respectively connected to the base and the emitter of the first triode Q1 to limit the current of the first voltage regulator tube ZD1, so that the first voltage regulator tube ZD1 is prevented from being burnt due to overlarge current. When the first voltage regulator ZD1 is turned on in the reverse direction, the voltage across the second resistor R2 starts to rise, and when the voltage across the second resistor R2 rises to 0.6V, the first triode Q1 is turned on, and the collector voltage of the first triode Q1 reaches a saturation state and becomes a low level (0 to 0.3V in this embodiment). When the voltage of the input power supply 50 is lower than the overvoltage set value of the first voltage regulator ZD1, the first voltage regulator ZD1 is turned off, the base of the first triode Q1 is grounded by the first resistor R1 and the second resistor R2, the first triode Q1 is turned off, and the collector of the first triode Q1 becomes a high level.
Further, the brown-out monitoring circuit 120 includes: a second zener ZD2 for setting the under-voltage set point; a third resistor R3 and a fourth resistor R4 for setting a high level voltage range; the output end of the second voltage regulator tube ZD2 is connected with the input power supply 50, the output end of the first voltage regulator tube ZD1 and the level conversion unit 30, the input end of the second voltage regulator tube ZD2 is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded.
Specifically, in this embodiment, the reverse breakdown voltage of the second regulator ZD2 is set to the under-voltage set value (8.2V in this embodiment). When the voltage of the input power supply 50 is lower than the undervoltage set value, the second voltage regulator ZD2 is turned off, and at this time, the voltage of the collector of the first triode Q1 is grounded by the fourth resistor R4, and becomes a low level. When the voltage of the input power supply 50 is higher than the undervoltage set value, the second voltage regulator ZD2 breaks down in the reverse direction, and the voltage of the collector of the first triode Q1 is pulled up to the voltage divided by the third resistor R3 and the fourth resistor R4, which is at a high level at this time. In particular, by adjusting the resistance values of the third resistor R3 and the fourth resistor R4, a corresponding high level voltage can be set to adapt to more switch modules 40.
In summary, the first and second voltage-regulator ZD1 and ZD2 are combined, so that the input power supply 50 within a certain range (greater than the undervoltage set value and less than the overvoltage set value) is normally powered; when the voltage of the input power supply 50 outside the range is input, the input power supply is cut off, so that the functions of overvoltage protection and undervoltage protection are achieved, and the circuit can normally work within the voltage range of 9V-17V. In addition, in this embodiment, the first and second voltage regulators ZD1 and ZD2 with different reverse breakdown voltages may also be provided, so as to flexibly control the voltage protection range; and the overvoltage monitoring circuit 110 and the undervoltage monitoring circuit 120 adopt a plurality of separated components, so that the overvoltage monitoring circuit is simple in structure, easy to replace the components, and has the advantages of concise design, flexibility, changeability and optimal cost.
Furthermore, the level shift unit 30 includes a fifth resistor R5, a sixth resistor R6, and a second triode Q2, wherein one end of the fifth resistor R5 is connected to the output end of the second voltage regulator ZD2, the output end of the first voltage regulator ZD1, and the input power source 50, the other end of the fifth resistor R5 is connected to the collector of the second triode Q2, one end of the sixth resistor R6, and the switch module 40, the base of the second triode Q2 is connected to the other end of the third resistor R3, one end of the fourth resistor R4, and the collector of the first triode Q1, and the emitter of the second triode Q2 and the other end of the sixth resistor R6 are all grounded.
In this embodiment, the fifth resistor R5, the sixth resistor R6, and the second transistor Q2 form an inverter circuit to match the switch module 40 with the low-level enable voltage. When the second transistor Q2 receives the first control signal POWER-EN with a high level, the second transistor Q2 is turned on, the collector current of the second transistor Q2 increases to a saturation state and becomes a low level, and the output switch module 40 provides an enable voltage. When the second transistor Q2 receives the first control signal POWER-EN with a low level, the second transistor Q2 is turned off, the voltage of the collector of the second transistor Q2 is divided by the fifth resistor R5 and the sixth resistor R6, and is output to the switch module 40, and the switch module 40 is turned off. In particular, the fifth resistor R5 and the sixth resistor R6 can be adjusted to set the output high level voltage to meet the input level requirements of different switch units or modules. In particular, in this embodiment, the first transistor Q1 and the second transistor Q2 are both NPN transistors.
Example two
Referring to fig. 3, in the present embodiment, the dc protection unit 10 includes an overvoltage protection circuit. The overvoltage monitoring circuit 110 detects the input POWER 50 from the overvoltage monitoring circuit 110 and outputs a first control signal POWER-EN to the level shift unit 30 according to the detection result, and the level shift unit 30 performs level shift according to the first control signal POWER-EN and outputs the level shift to the switch module 40. In this embodiment, the overvoltage protection unit 10 and the level conversion unit 30 are used separately to combine to only implement the overvoltage monitoring function, and can be applied to, but not limited to, a USB port power supply circuit.
In this embodiment, the overvoltage monitoring circuit 110 includes: a first zener ZD1 for setting an overpressure set point; a first resistor R1 and a second resistor R2 for current limiting protection of the first voltage regulator tube ZD 1; a first triode Q1 for outputting a control signal according to the detection result; a seventh resistor R7 for providing a pull-up voltage; the output end of the first voltage regulator tube ZD1 is connected to the input power supply 50, one end of a seventh resistor R7 and the level conversion unit 30, the input end of the first voltage regulator tube ZD1 is connected to one end of the first resistor R1 and one end of a second resistor R2, the other end of the first resistor R1 is connected to the base of the first triode Q1, the collector of the first triode Q1 is connected to the other end of the seventh resistor R7 and the level conversion unit 30, and the other end of the second resistor R2 and the emitter of the first triode Q1 are both grounded.
The level conversion unit 30 includes a fifth resistor R5 and a second triode Q2, one end of the fifth resistor R5 is connected to the output end of the first voltage regulator ZD1, one end of the seventh resistor R7, the input power source 50 and the switch module 40, the other end of the fifth resistor R5 is connected to the collector of the second triode Q2 and the switch module 40, the base of the second triode Q2 is connected to the other end of the seventh resistor R7 and the collector of the first triode Q1, and the emitter of the second triode Q2 is grounded.
In specific implementation, the switch module 40 in this embodiment is a PMOS transistor Q3, and the seventh resistor R7 is used as a pull-up resistor. When the voltage of the input power supply 50 is higher than an overvoltage set value, the first voltage-regulator tube ZD1 is reversely broken down, so that the first triode Q1 is conducted until the collector current is saturated and becomes low level, and the second triode Q2 is cut off, therefore, the Vgs voltage of the PMOS tube Q3 is 0V, and the PMOS tube Q3 is cut off; when the voltage of the input power supply 50 is lower than an overvoltage set value, the first triode Q1 is cut off, a high level is provided for the base electrode of the second triode Q2 through the seventh resistor R7, the second triode Q2 is conducted, the gate-source voltage Vgs of the PMOS transistor Q3 is-5V, and the PMOS transistor Q3 is conducted to supply power for the USB device. It should be noted that, in the present embodiment, the specific description is not consistent with the embodiment. In particular, in this embodiment, the first transistor Q1 and the second transistor Q2 are both NPN transistors.
EXAMPLE III
Referring to fig. 4, in the present embodiment, the dc protection unit 10 includes an under-voltage protection circuit, and is connected to an input power source 50 (a battery in the present embodiment) and a switch module 40. The undervoltage protection unit 20 detects an input POWER 50 and outputs a first control signal POWER-EN to the level shift unit 30 according to a detection result, and the level shift unit 30 performs level shift according to the first control signal POWER-EN and outputs the level shift to the switch module 40. In this embodiment, the under-voltage protection unit 20 and the level conversion unit 30 are used separately to combine, and only the under-voltage monitoring function is implemented, which can be applied to, but not limited to, the under-voltage protection circuit of the rechargeable battery.
Specifically, in this embodiment, the under-voltage monitoring circuit includes: a second zener ZD2 for setting the under-voltage set point; a third resistor R3 and a fourth resistor R4 for setting a high level voltage range; the output end of the second voltage regulator tube ZD2 is connected with the input power supply 50 and the level conversion unit 30, the input end of the second voltage regulator tube ZD2 is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded.
The level conversion unit 30 includes a fifth resistor R5 and a second triode Q2, one end of the fifth resistor R5 is connected to the output end of the second voltage regulator ZD2 and the input power source 50, the other end of the fifth resistor R5 is connected to the collector of the second triode Q2 and the switch module 40, the base of the second triode Q2 is connected to the other end of the third resistor R3 and one end of the fourth resistor R4, and the emitter of the second triode Q2 is grounded.
In specific implementation, the switch module 40 in this embodiment is a PMOS transistor Q3Q3, the under-voltage protection circuit is used in a 12V battery power supply system (not limited to the 12V battery power supply system, but also in other power supply systems, such as 5V, 3V, etc.), a voltage regulator having a reverse breakdown voltage of 8.2V is selected as a second voltage regulator ZD2, when the battery output voltage is less than 9V, the second voltage regulator ZD2 does not have a reverse voltage to pass through, so that the base voltage of the second triode Q2 is less than 0.6V, the second triode Q2 is cut off, and the PMOS transistor Q3 is also cut off, so as to implement negative voltage protection; when the output voltage of the battery is higher than 9V, the second voltage regulator ZD2 is broken down in the reverse direction, the base voltage of the second triode Q2 is switched into a high level (namely, the voltage is higher than 0.6V) through the third resistor R3 to be conducted, and at the moment, Vgs of the PMOS transistor Q3 is < -9V, so that the PMOS transistor Q3 is conducted to continuously supply power to a subsequent device connected with the PMOS transistor Q3. Particularly, the third resistor R3 and the fourth resistor R4 divide the reverse breakdown voltage transmitted from the second voltage regulator tube ZD2, and the voltage division ratio of the third resistor R3 and the fourth resistor R4 can be adjusted to increase or decrease the under-voltage protection threshold voltage value, so as to achieve the purpose of finely adjusting the threshold voltage, and meet the requirements of different threshold voltages, therefore, the under-voltage protection circuit can be adapted to various switching devices.
To sum up, the utility model provides a direct current protection control circuit is connected with input power and switch module, direct current protection control circuit includes direct current protection unit and level transition unit, by direct current protection unit detects input power and exports first control signal extremely according to the testing result level transition unit, by level transition unit basis first control signal carries out level transition and exports to switch module. The utility model discloses a direct current protection unit monitors input power to carry out level conversion through level conversion unit according to the monitoring result, make the control level of direct current protection unit output can adjust in a flexible way, use with the different switch module of collocation.
It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.
Claims (10)
1. A direct current protection control circuit is characterized by being connected with an input power supply and a switch module and comprising a direct current protection unit and a level conversion unit, wherein the direct current protection unit detects the input power supply and outputs a first control signal to the level conversion unit according to a detection result, and the level conversion unit performs level conversion according to the first control signal and outputs the first control signal to the switch module.
2. The dc protection control circuit according to claim 1, wherein the dc protection unit comprises an over-voltage protection circuit or an under-voltage protection circuit.
3. The dc protection control circuit of claim 2, wherein the overvoltage monitoring circuit comprises:
the first voltage-stabilizing tube is used for setting an overvoltage set value;
the first resistor and the second resistor are used for current-limiting protection of the first voltage regulator tube;
the first triode is used for outputting a control signal according to the detection result;
a seventh resistor for providing a pull-up voltage;
the output end of the first voltage-regulator tube is connected with the input power supply, one end of a seventh resistor and the level conversion unit, the input end of the first voltage-regulator tube is connected with one end of the first resistor and one end of a second resistor, the other end of the first resistor is connected with the base electrode of the first triode, the collector electrode of the first triode is connected with the other end of the seventh resistor and the level conversion unit, and the other end of the second resistor and the emitter electrode of the first triode are both grounded.
4. The DC protection control circuit according to claim 3, wherein the level shifter comprises a fifth resistor and a second triode, one end of the fifth resistor is connected to the output terminal of the first voltage regulator tube, one end of the seventh resistor, the input power supply and the switch module, the other end of the fifth resistor is connected to the collector of the second triode and the switch module, the base of the second triode is connected to the other end of the seventh resistor and the collector of the first triode, and the emitter of the second triode is grounded.
5. The dc protection control circuit of claim 2, wherein the brown-out monitoring circuit comprises:
the second voltage-regulator tube is used for setting an under-voltage set value;
a third resistor and a fourth resistor for setting a high level voltage range;
the output end of the second voltage-stabilizing tube is connected with an input power supply and a level conversion unit, the input end of the second voltage-stabilizing tube is connected with one end of the third resistor, the other end of the third resistor is connected with one end of the fourth resistor, and the other end of the fourth resistor is grounded.
6. The DC protection control circuit according to claim 5, wherein the level shifter comprises a fifth resistor and a second triode, one end of the fifth resistor is connected to the output terminal of the second voltage regulator tube and the input power supply, the other end of the fifth resistor is connected to a collector of the second triode and the switch module, a base of the second triode is connected to the other end of the third resistor and one end of the fourth resistor, and an emitter of the second triode is grounded.
7. The dc protection control circuit according to claim 1, wherein the dc protection unit includes an overvoltage protection circuit and an undervoltage protection circuit.
8. The dc protection control circuit of claim 7, wherein the overvoltage monitoring circuit comprises:
the first voltage-stabilizing tube is used for setting an overvoltage set value;
the first resistor and the second resistor are used for current-limiting protection of the first voltage regulator tube;
the first triode is used for outputting a control signal according to the detection result;
the output end of the first voltage-regulator tube is connected with the input power supply, the undervoltage monitoring circuit and the level conversion unit, the input end of the first voltage-regulator tube is connected with one end of a first resistor and one end of a second resistor, the other end of the first resistor is connected with the base electrode of the first triode, the collector electrode of the first triode is connected with the undervoltage monitoring circuit and the level conversion unit, and the other end of the second resistor and the emitter electrode of the first triode are grounded.
9. The dc protection control circuit of claim 8, wherein the brown-out monitoring circuit comprises:
the second voltage-regulator tube is used for setting an under-voltage set value;
a third resistor and a fourth resistor for setting a high level voltage range;
the output end of the second voltage-stabilizing tube is connected with an input power supply, the output end of the first voltage-stabilizing tube and the level conversion unit, the input end of the second voltage-stabilizing tube is connected with one end of the third resistor, the other end of the third resistor is connected with one end of the fourth resistor, and the other end of the fourth resistor is grounded.
10. The dc protection control circuit according to claim 9, wherein the level shifter comprises a fifth resistor, a sixth resistor, and a second triode, one end of the fifth resistor is connected to the output terminal of the second regulator, the output terminal of the first regulator, and the input power source, the other end of the fifth resistor is connected to the collector of the second triode, one end of the sixth resistor, and the switch module, the base of the second triode is connected to the other end of the third resistor, one end of the fourth resistor, and the collector of the first triode, and the emitter of the second triode and the other end of the sixth resistor are both grounded.
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| CN202020867918.7U CN212462818U (en) | 2020-05-21 | 2020-05-21 | Direct current protection control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114069825A (en) * | 2021-10-28 | 2022-02-18 | 国家电网有限公司 | Multi-output power direct current system |
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| CN114069825A (en) * | 2021-10-28 | 2022-02-18 | 国家电网有限公司 | Multi-output power direct current system |
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