CN218041182U - High-voltage-difference passive voltage judging and selecting circuit - Google Patents
High-voltage-difference passive voltage judging and selecting circuit Download PDFInfo
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- CN218041182U CN218041182U CN202221894909.2U CN202221894909U CN218041182U CN 218041182 U CN218041182 U CN 218041182U CN 202221894909 U CN202221894909 U CN 202221894909U CN 218041182 U CN218041182 U CN 218041182U
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Abstract
The utility model provides a high dropout passive voltage judges and selective circuit, including Vin signal end, the selective circuit, judge the circuit, the earthing terminal, high-pressure module and low pressure module, high-pressure module includes first input point and second input point, the low pressure module includes third input point and fourth input point, vin signal end is connected to first input point respectively, the input of selective circuit and the input of judgement circuit, the output of selective circuit is connected to the third input point, the output of judgement circuit is connected to the fourth input point, the earthing terminal is connected to between the output of judgement circuit and the fourth input point, the third input point is connected to between earthing terminal and the fourth input point; the utility model discloses whether the utilization is judged the circuit and is judged Vin signal end input voltage and be the low pressure, then through judging circuit control selection circuit and inputing the low pressure module with the low pressure, has avoided the high pressure to inpute the low pressure module in with the low pressure module damage.
Description
Technical Field
The present invention relates to the field of circuits, and more particularly, to voltage determination and selection circuits.
Background
The main power supply and emergency power supply dual-path redundancy design is adopted in some power supply systems, so that the stability of the system can be improved, and the system has the characteristics that the main power supply is in a high-voltage grade, and the emergency power supply is in a low-voltage grade. For example, the main power supply of the onboard power supply system is 270V high-voltage direct current, and the emergency power supply is 29V battery power supply. The requirement that 29V and 270V high-voltage difference input direct-current voltages can be converted into power supply voltage grades required by the system according to system power supply voltage conversion in a self-adaptive mode is provided for the power supply of the system, the current main design mode of the power supply adopts a plurality of power supply modules for parallel operation to achieve the requirements of input and output voltages and power grades, the input range of a high-voltage power supply module is 180-425V, and the input range of a low-voltage power supply module is 18-36V, so that a single power supply module cannot achieve the high-voltage difference input range, and a power supply combination design mode of modules with different input voltage ranges is required.
Chinese utility model patent publication No. CN204408314U discloses a voltage detection and switching circuit, which includes a dc voltage input terminal, a delay circuit, a voltage stabilizing circuit, a first switching tube circuit, a second switching tube circuit, a first output terminal and a second output terminal; the input end of the delay circuit, the input end of the voltage stabilizing circuit, the input end of the first switching tube circuit and the input end of the second switching tube circuit are connected with the direct-current voltage input end, the feedback input end of the delay circuit is connected with the output end of the second switching tube circuit, the feedback output end of the delay circuit is connected with the control end of the first switching tube circuit, the control output end of the voltage stabilizing circuit is connected with the control end of the second switching tube circuit, the output end of the first switching tube circuit is connected with the first output end, and the output end of the second switching tube circuit is connected with the second output end; the circuit of the utility model realizes automatic detection of the input direct current voltage amplitude, if the input direct current voltage amplitude meets the output requirement, the input direct current voltage amplitude is directly output through the first output end, and if the input direct current voltage amplitude is higher than the output requirement, the input direct current voltage amplitude is output through the second output end; however, the utility model discloses a be used in the voltage judgement and the selection that is less than 30V, can't satisfy the judgement and the selection of high pressure difference input.
SUMMERY OF THE UTILITY MODEL
For solving the problem that exists in the above-mentioned course of working, the utility model provides a poor passive voltage of high pressure judges and select circuit.
The technical scheme of the utility model is that:
the utility model provides a high dropout passive voltage judges and selective circuit, including Vin signal end, the selective circuit, judge the circuit, the earthing terminal, high-pressure module and low pressure module, high-pressure module includes first input point and second input point, the low pressure module includes third input point and fourth input point, vin signal end is connected to first input point respectively, the input of selective circuit and the input of judging the circuit, the output of selective circuit is connected to the third input point, the output of judging the circuit is connected to the fourth input point, the earthing terminal is connected to between the output of judging the circuit and the fourth input point, the third input point is connected to between earthing terminal and the fourth input point.
The judging circuit comprises a first sampling circuit and a second sampling circuit, the first sampling circuit is connected with the second sampling circuit in parallel, and the second sampling circuit is connected with the selecting circuit in parallel.
The first sampling circuit comprises a resistor R1, a resistor R2, a resistor R3, a diode D1 and a triode V1;
the resistor R1 is connected with the resistor R2 in series, the resistor R1 is connected to a Vin signal end, and the resistor R2 is connected to a ground end;
the base electrode of the triode V1 is connected between the resistor R1 and the resistor R2, the emitter electrode of the triode V1 is connected between the resistor R2 and the ground terminal, the collector electrode of the triode V1 is connected to the resistor R3, the resistor R3 is connected to the Vin signal end, and the resistor R3 is connected with the resistor R1 in parallel;
the cathode of the diode D1 is connected to the Vin signal terminal, and the anode of the diode D1 is connected between the ground terminal and the emitter of the triode V1.
The second sampling circuit comprises a resistor R4, a resistor R5, a resistor R6, a resistor R7, a diode D2 and a triode V2;
one end of the resistor R4 is connected between the Vin signal end and the selection circuit, and the other end of the resistor R4 is connected between the cathode of the diode D1 and the Vin signal end;
one end of the resistor R5 is connected between the cathode of the diode D1 and the Vin signal end, and the other end of the resistor R5 is connected between the emitting electrode of the triode V1 and the anode of the diode D1;
the base electrode of the triode V2 is connected between the negative electrode of the diode D1 and the resistor R4, and the emitting electrode of the triode V2 is connected to the grounding end;
one end of the resistor R7 is connected between the resistor R4 and the selection circuit, the other end is connected to the resistor R6,
the resistor R6 is connected to the collector of the triode V2;
the cathode of the diode D2 is connected between the resistor R7 and the selection circuit, and the anode of the diode D2 is connected between the resistors R7 and R6.
The selection circuit comprises a P-type MOS tube and a capacitor C1;
the source electrode of the P-type MOS tube is connected to the Vin signal end, the grid electrode of the P-type MOS tube is connected to the anode of the diode D2, and the drain electrode of the P-type MOS tube is connected to a third input point;
two ends of the capacitor C1 are respectively connected to the grid electrode and the drain electrode of the P-type MOS tube.
The beneficial effects of the utility model reside in that: the utility model provides a pair of high-pressure-difference passive voltage judges and select circuit utilizes and judges whether Vin signal end input voltage is the low pressure, then inputs the low pressure module through judging circuit control select circuit with the low pressure, has avoided the high pressure to input and has damaged the low pressure module in the low pressure module.
Drawings
Fig. 1 is a schematic diagram of the circuit principle of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides a high-dropout passive voltage judges and selective circuit, including Vin signal end, selective circuit, judge the circuit, the earthing terminal, high-pressure module and low-pressure module, high-pressure module includes first input point and second input point, the low-pressure module includes third input point and fourth input point, vin signal end is connected to first input point respectively, selective circuit's input and the input of judging the circuit, selective circuit's output is connected to the third input point, the output of judging the circuit is connected to the fourth input point, the earthing terminal is connected to between the output of judging the circuit and the fourth input point, the third input point is connected to between earthing terminal and the fourth input point. The low-voltage module is a low-voltage input DC/DC power module, and the high-voltage module is a high-voltage input DC/DC power module.
The judging circuit comprises a first sampling circuit and a second sampling circuit, the first sampling circuit is connected with the second sampling circuit in parallel, and the second sampling circuit is connected with the selecting circuit in parallel.
The first sampling circuit comprises a resistor R1, a resistor R2, a resistor R3, a diode D1 and a triode V1; the diode D1 is a voltage stabilizing diode, and the triode V1 is an NPN type triode;
the resistor R1 is connected with the resistor R2 in series, the resistor R1 is connected to a Vin signal end, and the resistor R2 is connected to a grounding end; the resistor R1 and the resistor R2 are connected in series to divide the input voltage of the Vin signal end;
the base electrode of the triode V1 is connected between the resistor R1 and the resistor R2, the emitter electrode of the triode V1 is connected between the resistor R2 and the ground terminal, the collector electrode of the triode V1 is connected to the resistor R3, the resistor R3 is connected to the Vin signal end, and the resistor R3 is connected with the resistor R1 in parallel; the triode V1 has the functions of current amplification and switching, and the current is limited by the resistor R3, so that the Vin signal end provides voltage bias for the collector of the triode V1, and the passive effect is achieved; when the input voltage of the Vin signal end is low voltage, the voltage is lower than the conduction voltage of the triode V1 after the voltage is divided by the resistor R1 and the resistor R2, and the triode V1 is not conducted at the moment; when the input voltage of the Vin signal end is high voltage, the voltage is higher than the conduction voltage of the triode V1 after the voltage is divided by the resistor R1 and the resistor R2, and the triode V1 is conducted at the moment; the resistor R3 is connected with the resistor R1 in parallel, so that the triode V1 can be prevented from being damaged; the emitting electrode of the triode V1 is grounded, so that the potential of the emitting electrode of the triode V1 can be kept to be minimum, and the triode V1 can work normally;
the cathode of the diode D1 is connected to the Vin signal terminal, and the anode of the diode D1 is connected between the ground terminal and the emitter of the triode V1. Diode D1 can make triode V1's base voltage clamp to suitable value, and electronic components among the protection circuit guarantees the reliable and stable of whole circuit.
The second sampling circuit comprises a resistor R4, a resistor R5, a resistor R6, a resistor R7, a diode D2 and a triode V2; the diode D2 is a voltage stabilizing diode, and the triode V2 is an NPN type triode;
one end of the resistor R4 is connected between the Vin signal end and the selection circuit, and the other end of the resistor R4 is connected between the cathode of the diode D1 and the Vin signal end;
one end of the resistor R5 is connected between the cathode of the diode D1 and the Vin signal end, and the other end of the resistor R5 is connected between the emitting electrode of the triode V1 and the anode of the diode D1; the resistor R5 and the resistor R4 can divide the input voltage of the Vin signal end;
the base electrode of the triode V2 is connected between the negative electrode of the diode D1 and the resistor R4, and the emitting electrode of the triode V2 is connected to the grounding end; the triode V2 has the functions of current amplification and switching, when the input voltage of the Vin signal end is low voltage, the triode V1 is not conducted, at the moment, the voltage is divided by the resistors R4 and R5 and then is higher than the conduction voltage of the triode V2, the triode V1 is conducted, when the input voltage of the Vin signal end is high voltage, the triode V1 is conducted, the base voltage of the triode V2 is pulled down, and the triode V2 is not conducted;
one end of the resistor R7 is connected between the resistor R4 and the selection circuit, the other end is connected to the resistor R6,
the resistor R6 is connected to the collector of the triode V2; the current is limited by the resistor R6 and the resistor R7, so that the Vin signal end provides voltage bias for the collector of the triode V2, and the passive effect is achieved; the emitting electrode of the triode V2 is grounded, so that the potential of the emitting electrode of the triode V2 can be kept to be minimum, and the triode V2 can work normally;
the cathode of the diode D2 is connected between the resistor R7 and the selection circuit, and the anode of the diode D2 is connected between the resistors R7 and R6. Diode D2 cooperation diode D1 can make triode V2's base voltage clamp to suitable value, and electronic components among the protection circuit ensures the reliable and stable of whole circuit.
The selection circuit comprises a P-type MOS tube and a capacitor C1; the P-type MOS tube V3 is a P-channel depletion type field effect transistor;
the source electrode of the P-type MOS tube is connected to the Vin signal end, the grid electrode of the P-type MOS tube is connected to the anode of the diode D2, and the drain electrode of the P-type MOS tube is connected to a third input point; when the input voltage of the Vin signal end is low voltage, the triode V2 is conducted, the resistor R6 is grounded, the Vin signal end enters the grid electrode and the source electrode of the MOS tube, and the MOS tube is conducted; when the input voltage at the Vin signal end is high voltage, the transistor V2 is not conducted, so the MOS transistor V3 is not conducted.
Two ends of the capacitor C1 are respectively connected to the grid electrode of the P-type MOS tube and the drain electrode of the P-type MOS tube.
The miller effect is generated by the capacitor C1, so that the gate voltage does not flow to the source of the MOS transistor V3, but flows to the drain of the MOS transistor V3.
The working principle is as follows: as shown in fig. 1, the utility model provides a pair of high dropout passive voltage judges and select circuit, vin signal end is connected to first input point, select circuit and judgement circuit respectively, when judging the circuit and detecting that the voltage of Vin signal end input is the low pressure, judges that circuit control select circuit switches on, makes Vin signal end get into the third input point behind the select circuit, and the low pressure module work, because the voltage of Vin signal end input is less than the input voltage scope of high pressure module, therefore high pressure module is out of work; when the judging circuit detects that the voltage input by the Vin signal end is high voltage, the voltage input by the Vin signal end is in the input voltage range of the high-voltage module at the moment, the high-voltage module works, on the other hand, the judging circuit controls the selecting circuit to be not conducted, and the low-voltage module does not work. The method comprises the following specific steps:
the Vin signal end is connected to the first input point, and when the input voltage of the Vin signal end is low voltage, the input voltage of the Vin signal end is smaller than the input voltage range of the high-voltage module, and the high-voltage module does not work; on the other hand, the voltage of the Vin signal end input voltage is lower than the conduction voltage of the triode V1 after being divided by the resistor R1 and the resistor R2, the triode V1 is not conducted, the voltage of the Vin signal end input voltage is higher than the conduction voltage of the triode V2 after being divided by the resistor R4 and the resistor R5, the triode V2 is conducted, the grid electrode of the P-type MOS tube V3 is grounded through the resistor R6 and the triode V2, the Vin signal end is applied to the P-type MOS tube at the moment, the P-type MOS tube is conducted, the Vin signal end input voltage is input to a third input point of the low-voltage module after passing through the P-type MOS tube at the moment, and the low-voltage module works.
The Vin signal end is connected to the first input point, and when the input voltage of the Vin signal end is high voltage, the input voltage of the Vin signal end meets the input voltage range of the high-voltage module, and the high-voltage module works; on the other hand, after the Vin signal end input voltage is divided by the resistor R1 and the resistor R2, the voltage is higher than the conduction voltage of the triode V1, the triode V1 is conducted at the moment, the voltage applied to the base electrode of the triode V2 is pulled low, the triode V2 is not conducted at the moment, therefore, the P-type MOS tube V3 is not conducted, and the low-voltage module does not work.
Claims (5)
1. The utility model provides a high dropout passive voltage judges and select circuit which characterized in that: including Vin signal terminal, selection circuit, judgement circuit, earthing terminal, high-voltage module and low pressure module, high-voltage module includes first input point and second input point, low pressure module includes third input point and fourth input point, vin signal terminal is connected to respectively the first input point of high-voltage module the input of selection circuit with the input of judgement circuit, selection circuit's output is connected to the third input point, the output of judgement circuit is connected to the fourth input point, the earthing terminal is connected to between output and the fourth input point of judgement circuit, the third input point is connected to between earthing terminal and the fourth input point.
2. The high dropout passive voltage determining and selecting circuit of claim 1, wherein: the judging circuit comprises a first sampling circuit and a second sampling circuit, the first sampling circuit is connected with the second sampling circuit in parallel, and the second sampling circuit is connected with the selecting circuit in parallel.
3. The high dropout passive voltage determining and selecting circuit of claim 2, wherein: the first sampling circuit comprises a resistor R1, a resistor R2, a resistor R3, a diode D1 and a triode V1;
the resistor R1 is connected with the resistor R2 in series, the resistor R1 is connected to a Vin signal end, and the resistor R2 is connected to a ground end;
the base electrode of the triode V1 is connected between the resistor R1 and the resistor R2, the emitter electrode of the triode V1 is connected between the resistor R2 and the grounding end, the collector electrode of the triode V1 is connected to the resistor R3, the resistor R3 is connected to the Vin signal end, and the resistor R3 is connected with the resistor R1 in parallel;
the cathode of the diode D1 is connected to the Vin signal end, and the anode of the diode D1 is connected between the ground end and the emitter of the triode V1.
4. The high dropout passive voltage determining and selecting circuit of claim 2, wherein: the second sampling circuit comprises a resistor R4, a resistor R5, a resistor R6, a resistor R7, a diode D2 and a triode V2;
one end of the resistor R4 is connected between the Vin signal end and the selection circuit, and the other end of the resistor R4 is connected between the cathode of the diode D1 and the Vin signal end;
one end of the resistor R5 is connected between the cathode of the diode D1 and the Vin signal end, and the other end of the resistor R5 is connected between the emitting electrode of the triode V1 and the anode of the diode D1;
the base electrode of the triode V2 is connected between the negative electrode of the diode D1 and the resistor R4, and the emitting electrode of the triode V2 is connected to the grounding end;
one end of the resistor R7 is connected between the resistor R4 and the selection circuit, the other end of the resistor R7 is connected to the resistor R6, and the resistor R6 is connected to the collector of the triode V2;
the cathode of the diode D2 is connected between the resistor R7 and the selection circuit, and the anode of the diode D2 is connected between the resistors R7 and R6.
5. The high dropout passive voltage determining and selecting circuit of claim 1, wherein: the selection circuit comprises a P-type MOS tube and a capacitor C1;
the source electrode of the P-type MOS tube is connected to a Vin signal end, the grid electrode of the P-type MOS tube is connected to the anode of the diode D2, and the drain electrode of the P-type MOS tube is connected to a third input point;
and two ends of the capacitor C1 are respectively connected to the grid electrode and the drain electrode of the P-type MOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221894909.2U CN218041182U (en) | 2022-07-21 | 2022-07-21 | High-voltage-difference passive voltage judging and selecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221894909.2U CN218041182U (en) | 2022-07-21 | 2022-07-21 | High-voltage-difference passive voltage judging and selecting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN218041182U true CN218041182U (en) | 2022-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221894909.2U Active CN218041182U (en) | 2022-07-21 | 2022-07-21 | High-voltage-difference passive voltage judging and selecting circuit |
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| CN (1) | CN218041182U (en) |
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