CN202939292U - Direct-current power supply monitoring circuit - Google Patents

Direct-current power supply monitoring circuit Download PDF

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Publication number
CN202939292U
CN202939292U CN 201220646719 CN201220646719U CN202939292U CN 202939292 U CN202939292 U CN 202939292U CN 201220646719 CN201220646719 CN 201220646719 CN 201220646719 U CN201220646719 U CN 201220646719U CN 202939292 U CN202939292 U CN 202939292U
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monitoring module
input
output terminal
negative
input end
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Chinese (zh)
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祁超
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Raisecom Technology Co Ltd
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Raisecom Technology Co Ltd
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Abstract

The utility model discloses a direct-current power supply monitoring circuit which comprises an input fault monitoring module, an over-current monitoring module, an over-voltage monitoring module, an under-voltage monitoring module, an alarming module and a protective tube. A first end of the protective tube is connected with a positive output end of a direct-current power supply; the input fault monitoring module is connected between the positive output end and a negative output end of the direct-current power supply; the over-current monitoring module, the over-voltage monitoring module and the under-voltage monitoring module are connected between a second end of the protective tube and the negative output end of the direct-current power supply; the input fault monitoring module, the over-current monitoring module and the under-voltage monitoring module output high levels when detecting a fault; the over-voltage monitoring module outputs a low level when detecting a fault; and the alarming module outputs an alarming indication signal when receiving the high level output by any of the input fault monitoring module, the over-current monitoring module and the under-voltage monitoring module or the low level output by the over-voltage monitoring module. The direct-current power supply monitoring circuit is implemented by using a discrete component, supports a variety of monitoring functions and is low in cost and flexible in application.

Description

A kind of direct current source monitoring circuit
Technical field
The utility model relates to the power circuit technical field, in particular a kind of direct current source monitoring circuit.
Background technology
Monitoring for DC voltage in dc suppling equipment is very necessary, and the chip that possesses at present the voltage monitoring function is of a great variety, so mostly directly adopt special chip completing circuit required function in the DC voltage supervisory circuit.But because the voltage range that every kind of chip can be monitored is limited, and monitoring function is also limited, can not use a slice chip to complete the monitoring function that all need, so should use underaction, and because the cost of chip is higher, must bring the rising of cost of products.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of direct current source monitoring circuit, and this supervisory circuit uses discrete component to realize, supports multiple monitoring function, the low and applying flexible of cost.
In order to solve the problems of the technologies described above, the utility model provides a kind of direct current source monitoring circuit, described direct supply comprises positive output end and negative output terminal, it is characterized in that, comprising: input fault monitoring module, overcurrent monitoring module, overvoltage monitoring module, under-voltage monitoring module, alarm module and protective tube; Described alarm module is connected with input fault monitoring module, overcurrent monitoring module, overvoltage monitoring module and under-voltage monitoring module;
Described protective tube comprises first end and the second end, and described first end is connected with the positive output end of direct supply;
The input fault monitoring module is connected between the positive and negative output terminal of direct supply, as direct supply no-output as described in detecting, and exports high level;
The overcurrent monitoring module is connected between the negative output terminal of the second end of protective tube and direct supply, as protective tube fusing as described in detecting, and exports high level;
The overvoltage monitoring module is connected between the negative output terminal of the second end of protective tube and direct supply, as described in detecting the output voltage of direct supply greater than default overvoltage threshold, an output low level;
Under-voltage monitoring module is connected between the negative output terminal of the second end of protective tube and direct supply, as described in detecting, the output voltage of direct supply less than a default under-voltage threshold value, is exported high level;
Alarm module, as receive the high level of arbitrary monitoring module output in input fault monitoring module, overcurrent monitoring module and under-voltage monitoring module or receive the low level that the overvoltage monitoring module is exported, outputting alarm indicator signal.
Further, this direct current source monitoring circuit also comprises following characteristics:
Described input fault monitoring module comprises: the first photoelectrical coupler U1, current-limiting resistance R1 and pull-up resistor R2; U1 comprises positive input terminal, negative input end, positive output end and negative output terminal;
The positive input terminal of U1 is connected with the second end of R1;
The negative input end of U1 is connected with the negative output terminal of direct supply;
The positive output end of U1 is connected with the second end and the described alarm module of R2;
The negative output terminal ground connection of U1;
The first end of R1 is connected with the positive output end of direct supply;
The first end of R2 is connected with the power supply VCC of described the first photoelectrical coupler U1.
Further, this direct current source monitoring circuit also comprises following characteristics:
Described overcurrent monitoring module comprises: the second photoelectrical coupler U2, current-limiting resistance R4 and pull-up resistor R5; U2 comprises positive input terminal, negative input end, positive output end and negative output terminal;
The positive input terminal of U2 is connected with the second end of R4;
The negative input end of U2 is connected with the negative output terminal of direct supply;
The positive output end of U2 is connected with the second end and the described alarm module of R5;
The negative output terminal ground connection of U2;
The first end of R4 is connected with the second end of protective tube;
The first end of R5 is connected with the power supply VCC of described the second photoelectrical coupler U2.
Further, this direct current source monitoring circuit also comprises following characteristics:
Described overvoltage monitoring module comprises: the 3rd photoelectrical coupler U3, the first stabilivolt D1, source of stable pressure diode D2, the first bleeder circuit, current-limiting resistance R6 and pull-up resistor R7; U3 comprises positive input terminal, negative input end, positive output end and negative output terminal; D1 comprises negative electrode and anode; D2 comprises negative electrode, anode and the 3rd end; The first bleeder circuit is connected between the negative output terminal of the second end of protective tube and direct supply;
The positive input terminal of U3 is connected with the second end of R6 and the negative electrode of D1;
The negative input end of U3 is connected with the negative electrode of D2;
The positive output end of U3 is connected with the second end and the described alarm module of R7;
The negative output terminal ground connection of U3;
The first end of R6 is connected with the second end of protective tube;
The anode of D1 is connected with the negative output terminal of direct supply;
The anode of D2 is connected with the negative output terminal of direct supply, and the 3rd end of D2 is connected with the dividing point of described the first bleeder circuit;
The first end of R7 is connected with the power supply VCC of described the 3rd photoelectrical coupler U3.
Further, this direct current source monitoring circuit also comprises following characteristics:
Described under-voltage monitoring module comprises: the 4th photoelectrical coupler U4, the 3rd stabilivolt D3, source of stable pressure diode D4, the second bleeder circuit, current-limiting resistance R10 and pull-up resistor R11; U4 comprises positive input terminal, negative input end, positive output end and negative output terminal; D3 comprises negative electrode and anode; D4 comprises negative electrode, anode and the 3rd end; The second bleeder circuit is connected between the negative output terminal of the second end of protective tube and direct supply;
The positive input terminal of U4 is connected with the second end of R10 and the negative electrode of D3;
The negative input end of U4 is connected with the negative electrode of D4;
The positive output end of U4 is connected with the second end and the described alarm module of R11;
The negative output terminal ground connection of U4;
The first end of R10 is connected with the second end of protective tube;
The anode of D3 is connected with the negative output terminal of direct supply;
The anode of D4 is connected with the negative output terminal of direct supply, and the 3rd end of D4 is connected with the dividing point of described the second bleeder circuit;
The first end of R11 is connected with the power supply VCC of described the 4th photoelectrical coupler U4.
Further, this direct current source monitoring circuit also comprises following characteristics:
Described alarm module comprises IIC control chip, the first phase inverter, the second phase inverter and the 3rd phase inverter; Described IIC control chip comprises the first interrupting input end, the second interrupting input end, the 3rd interrupting input end and the 4th interrupting input end and processing unit;
The first interrupting input end of described IIC control chip is connected with the output terminal of the first phase inverter, and the input end of described the first phase inverter is connected with the input fault monitoring module;
The second interrupting input end of described IIC control chip is connected with the output terminal of the second phase inverter, and the input end of described the second phase inverter is connected with the overcurrent monitoring module;
The 3rd interrupting input end of described IIC control chip is connected with the overvoltage monitoring module;
The 4th interrupting input end of described IIC control chip is connected with the output terminal of the 3rd phase inverter, and the input end of described the 3rd phase inverter is connected with under-voltage monitoring module;
Described processing unit receives low level signal as arbitrary interrupting input end in the first interrupting input end, the second interrupting input end, the 3rd interrupting input end and the 4th interrupting input end of IIC control chip as described in detecting, and exports look-at-me.
Further, this direct current source monitoring circuit also comprises following characteristics:
Described alarm module comprises or door, light emitting diode ALARM and phase inverter; Described or door comprises first input end, the second input end, the 3rd input end, four-input terminal and output terminal;
First input end described or door is connected with the input fault monitoring module;
The second input end described or door is connected with the overcurrent monitoring module;
The 3rd input end described or door is connected with the output terminal of phase inverter;
Four-input terminal described or door is connected with under-voltage monitoring module;
Output terminal described or door is connected with the anode of described light emitting diode ALARM;
The input end of phase inverter is connected with the overvoltage monitoring module;
The plus earth of light emitting diode ALARM;
If in first input end, the second input end, the 3rd input end and the four-input terminal of described or door, arbitrary input end receives high level, light emitting diode ALARM lights.
Further, this direct current source monitoring circuit also comprises following characteristics:
Also comprise power supply input indicating module, described power supply input indicating module comprises light emitting diode PWR and current-limiting resistance R3;
The anode of described LED P WR is connected with the second end of R3;
The negative electrode of described LED P WR is connected with the negative output terminal of direct supply;
The first end of described current-limiting resistance R3 is connected with the second end of protective tube.
Further, this direct current source monitoring circuit also comprises following characteristics:
Described IIC control chip adopts chip PCA9544.
compared with prior art, a kind of direct current source monitoring circuit that the utility model provides, comprise: the input fault monitoring module, the overcurrent monitoring module, the overvoltage monitoring module, under-voltage monitoring module, alarm module and protective tube, the first end of protective tube is connected with the positive output end of direct supply, the input fault monitoring module just is being connected to direct supply, between negative output terminal, the overcurrent monitoring module, overvoltage monitoring module and under-voltage monitoring module are connected between the negative output terminal of the second end of protective tube and direct supply, the input fault monitoring module, the overcurrent monitoring module, output high level when under-voltage monitoring module detects fault, output low level when the overvoltage monitoring module detects fault, alarm module is as receiving the input fault monitoring module, the high level of arbitrary monitoring module output in overcurrent monitoring module and under-voltage monitoring module, or receive the low level of overvoltage monitoring module output, outputting alarm indicator signal.The utility model uses discrete component to realize, supports multiple monitoring function, cost is low and applying flexible.
Description of drawings
Fig. 1 is the block scheme of the direct current source monitoring circuit of the utility model embodiment.
Fig. 2 is the circuit diagram of input fault monitoring module and overcurrent monitoring module in Fig. 1.
Fig. 3 is the circuit diagram of overvoltage monitoring module and under-voltage monitoring module in Fig. 1.
Fig. 4 is the circuit diagram of a kind of alarm module in Fig. 1 (band IIC control chip).
Fig. 5 is the circuit diagram of another kind of alarm module in Fig. 1 (band light emitting diode).
Fig. 6 is the circuit diagram of power supply input indicating module in Fig. 1.
Fig. 7 is the circuit diagram of IIC control chip (PCA9544) in Fig. 4.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, hereinafter in connection with accompanying drawing, embodiment of the present utility model is elaborated.Need to prove, in the situation that do not conflict, the embodiment in the application and the feature in embodiment be combination in any mutually.
Direct current source monitoring circuit of the present utility model is made of discrete component, can realize dc power supply input fault (without input), overcurrent, overvoltage, under-voltage four kinds of monitoring states.
As shown in Figure 1, the utility model embodiment provides a kind of direct current source monitoring circuit, described direct supply comprises positive output end and negative output terminal, comprising: input fault monitoring module 10, overcurrent monitoring module 20, overvoltage monitoring module 30, under-voltage monitoring module 40, alarm module 50 and protective tube; Described alarm module is connected with input fault monitoring module, overcurrent monitoring module, overvoltage monitoring module and under-voltage monitoring module;
Described protective tube comprises first end and the second end, and described first end is connected with the positive output end of direct supply;
The input fault monitoring module is connected between the positive and negative output terminal of direct supply, as direct supply no-output as described in detecting, and exports high level;
The overcurrent monitoring module is connected between the negative output terminal of the second end of protective tube and direct supply, as protective tube fusing as described in detecting, and exports high level;
The overvoltage monitoring module is connected between the negative output terminal of the second end of protective tube and direct supply, as described in detecting the output voltage of direct supply greater than default overvoltage threshold, an output low level;
Under-voltage monitoring module is connected between the negative output terminal of the second end of protective tube and direct supply, as described in detecting, the output voltage of direct supply less than a default under-voltage threshold value, is exported high level;
Alarm module, as receive the high level of arbitrary monitoring module output in input fault monitoring module, overcurrent monitoring module and under-voltage monitoring module or receive the low level that the overvoltage monitoring module is exported, outputting alarm indicator signal.
This direct current source monitoring circuit further comprises following characteristics:
Wherein, as shown in Figure 2, described input fault monitoring module comprises: the first photoelectrical coupler U1, current-limiting resistance R1 and pull-up resistor R2; U1 comprises positive input terminal, negative input end, positive output end and negative output terminal;
The positive input terminal of U1 is connected with the second end of R1;
The negative input end of U1 is connected with the negative output terminal of direct supply;
The positive output end of U1 is connected with the second end and the described alarm module of R2;
The negative output terminal ground connection of U1;
The first end of R1 is connected with the positive output end of direct supply;
The first end of R2 is connected with the power supply VCC of described the first photoelectrical coupler U1;
Direct supply no-output as described, the first photoelectrical coupler U1 cut-off, the positive output end output high level of U1; Direct supply has output as described, the first photoelectrical coupler U1 conducting, the positive output end output low level of U1.
Wherein, as shown in Figure 2, described overcurrent monitoring module comprises: the second photoelectrical coupler U2, current-limiting resistance R4 and pull-up resistor R5; U2 comprises positive input terminal, negative input end, positive output end and negative output terminal;
The positive input terminal of U2 is connected with the second end of R4;
The negative input end of U2 is connected with the negative output terminal of direct supply;
The positive output end of U2 is connected with the second end and the described alarm module of R5;
The negative output terminal ground connection of U2;
The first end of R4 is connected with the second end of protective tube;
The first end of R5 is connected with the power supply VCC of described the second photoelectrical coupler U2;
Protective tube fusing as described, the second photoelectrical coupler U2 cut-off, the positive output end output high level of U2; Protective tube does not fuse as described, the second photoelectrical coupler U2 conducting, the positive output end output low level of U2.
Wherein, as shown in Figure 3, described overvoltage monitoring module comprises: the 3rd photoelectrical coupler U3, the first stabilivolt D1, source of stable pressure diode D2, the first bleeder circuit, current-limiting resistance R6 and pull-up resistor R7; U3 comprises positive input terminal, negative input end, positive output end and negative output terminal; D1 comprises negative electrode and anode; D2 comprises negative electrode, anode and the 3rd end; The first bleeder circuit is connected between the negative output terminal of the second end of protective tube and direct supply;
The positive input terminal of U3 is connected with the second end of R6 and the negative electrode of D1;
The negative input end of U3 is connected with the negative electrode of D2;
The positive output end of U3 is connected with the second end and the described alarm module of R7;
The negative output terminal ground connection of U3;
The first end of R6 is connected with the second end of protective tube;
The anode of D1 is connected with the negative output terminal of direct supply;
The anode of D2 is connected with the negative output terminal of direct supply, and the 3rd end of D2 is connected with the dividing point of described the first bleeder circuit;
The first end of R7 is connected with the power supply VCC of described the 3rd photoelectrical coupler U3;
Wherein, less than overvoltage threshold, the input voltage of the 3rd end of described source of stable pressure diode D2 is less than the internal reference voltage of D2 as the output voltage of direct supply, the D2 cut-off, the 3rd photoelectrical coupler U3 cut-off, electric current mainly flows through from the first stabilivolt D1, the positive output end output high level of U3; More than or equal to overvoltage threshold, the input voltage of the 3rd end of described source of stable pressure diode D2 is more than or equal to the internal reference voltage of D2, D2 conducting, U3 conducting, the positive output end output low level of U3 as the output voltage of direct supply;
The first bleeder circuit comprises resistance R 8 and R9, and wherein, the first end of R8 is connected with the second end of described protective tube, and the second end of R8 is connected with the first end of R9, and the second end of R9 is connected with the negative output terminal of direct supply; The intrinsic standoff ratio of the first bleeder circuit is P1, P1=R9/ (R8+R9), overvoltage threshold is A1, and the reference voltage of source of stable pressure diode D2 is S, and the relation between the reference voltage S of overvoltage threshold A1, intrinsic standoff ratio P1 and source of stable pressure diode D2 satisfies: P1=S/A1;
Wherein, described default overvoltage threshold is determined by the intrinsic standoff ratio of the first bleeder circuit.
Wherein, as shown in Figure 3, described under-voltage monitoring module comprises: the 4th photoelectrical coupler U4, the 3rd stabilivolt D3, source of stable pressure diode D4, the second bleeder circuit, current-limiting resistance R10 and pull-up resistor R11; U4 comprises positive input terminal, negative input end, positive output end and negative output terminal; D3 comprises negative electrode and anode; D4 comprises negative electrode, anode and the 3rd end; The second bleeder circuit is connected between the negative output terminal of the second end of protective tube and direct supply;
The positive input terminal of U4 is connected with the second end of R10 and the negative electrode of D3;
The negative input end of U4 is connected with the negative electrode of D4;
The positive output end of U4 is connected with the second end and the described alarm module of R11;
The negative output terminal ground connection of U4;
The first end of R10 is connected with the second end of protective tube;
The anode of D3 is connected with the negative output terminal of direct supply;
The anode of D4 is connected with the negative output terminal of direct supply, and the 3rd end of D4 is connected with the dividing point of described the second bleeder circuit;
The first end of R11 is connected with the power supply VCC of described the 4th photoelectrical coupler U4;
Wherein, more than or equal to under-voltage threshold value, the input voltage of the 3rd end of described source of stable pressure diode D4 is more than or equal to the internal reference voltage of D4, D4 conducting as the output voltage of direct supply, described the 4th photoelectrical coupler U4 conducting, the positive output end output low level of U4; Less than under-voltage threshold value, the input voltage of the 3rd end of described source of stable pressure diode D4 is less than the internal reference voltage of D4 as the output voltage of direct supply, the D4 cut-off, and the U4 cut-off, electric current mainly flows through from the 3rd stabilivolt D3, the positive output end output high level of U4;
The second bleeder circuit comprises resistance R 12 and R13, and wherein, the first end of R12 is connected with the second end of described protective tube, and the second end of R12 is connected with the first end of R13, and the second end of R13 is connected with the negative output terminal of direct supply; The intrinsic standoff ratio of the second bleeder circuit is P2, P2=R13/ (R12+R13), under-voltage threshold value is A2, and the reference voltage of source of stable pressure diode D4 is S, and the relation between the reference voltage S of under-voltage threshold value A 2, intrinsic standoff ratio P2 and source of stable pressure diode D4 satisfies: P2=S/A2;
Wherein, described default under-voltage threshold value is determined by the intrinsic standoff ratio of the second bleeder circuit.
Wherein, Fig. 4 shows a kind of alarm module, comprises IIC control chip, the first phase inverter, the second phase inverter and the 3rd phase inverter; Described IIC control chip comprises the first interrupting input end, the second interrupting input end, the 3rd interrupting input end and the 4th interrupting input end and processing unit;
The first interrupting input end of described IIC control chip is connected with the output terminal of the first phase inverter, and the input end of described the first phase inverter is connected with the input fault monitoring module;
The second interrupting input end of described IIC control chip is connected with the output terminal of the second phase inverter, and the input end of described the second phase inverter is connected with the overcurrent monitoring module;
The 3rd interrupting input end of described IIC control chip is connected with the overvoltage monitoring module;
The 4th interrupting input end of described IIC control chip is connected with the output terminal of the 3rd phase inverter, and the input end of described the 3rd phase inverter is connected with under-voltage monitoring module;
Described processing unit receives low level signal as arbitrary interrupting input end in the first interrupting input end, the second interrupting input end, the 3rd interrupting input end and the 4th interrupting input end of IIC control chip as described in detecting, and exports look-at-me;
Wherein, after arbitrary interrupting input end of IIC control chip receives low level, corresponding variation can occur in the value of the particular register of described IIC control chip, host computer is after the look-at-me that the IIC control chip detected, the value of the particular register by reading described IIC control chip can know which interrupting input end of IIC control chip has received low level, thereby knows any alarm (alarm of power supply input fault, overcurrent alarm, overvoltage alarm, undervoltage alarm) has occured.
Wherein, Fig. 5 shows another kind of alarm module, comprises or door, light emitting diode ALARM and phase inverter; Described or door comprises first input end, the second input end, the 3rd input end, four-input terminal and output terminal;
First input end described or door is connected with the input fault monitoring module;
The second input end described or door is connected with the overcurrent monitoring module;
The 3rd input end described or door is connected with the output terminal of phase inverter;
Four-input terminal described or door is connected with under-voltage monitoring module;
Output terminal described or door is connected with the anode of described light emitting diode ALARM;
The input end of phase inverter is connected with the overvoltage monitoring module;
The plus earth of light emitting diode ALARM;
If in first input end, the second input end, the 3rd input end and the four-input terminal of described or door, arbitrary input end receives high level, light emitting diode ALARM lights.
Wherein, as shown in Figure 6, also comprise power supply input indicating module 60, described power supply input indicating module comprises light emitting diode PWR and current-limiting resistance R3;
The anode of described LED P WR is connected with the second end of R3;
The negative electrode of described LED P WR is connected with the negative output terminal of direct supply;
The first end of described current-limiting resistance R3 is connected with the second end of protective tube.
Wherein, when protective tube did not fuse, if direct supply has output, LED P WR lighted, if the direct supply no-output, LED P WR extinguishes; As protective tube fusing has occured, LED P WR extinguishes.
Use example
The output voltage nominal value of supposing monitored direct supply is 48V, and the actual output voltage range that allows is 38.4~57.6V, and output-current rating is 30A, for choosing of the concrete discrete component in above-mentioned direct current source monitoring circuit, is exemplified below:
For the overvoltage monitoring circuit, source of stable pressure diode D2 can adopt LM431; R8 adopts three surface-mount resistor series connection, the resistance of these three surface-mount resistors is respectively: 100K ohm, 10K ohm, 3.01K ohm, it is the surface-mount resistor of 4.99K ohm that R9 adopts resistance, the intrinsic standoff ratio that can calculate the first bleeder circuit is P1=0.0423, and overvoltage threshold A1 is: A1=S/P1=59.1V; Can find out, when output voltage is 60V, electric current by each resistance is 0.51mA, and the ohmically power of power consumption maximum is 0.51mA * 0.51mA * 100K=0.03W, and selection rated power is that 0805 (encapsulation format) surface-mount resistor of 0.125W meets the demands fully.
For under-voltage supervisory circuit, source of stable pressure diode D4 can adopt LM431; R12 adopts 2 surface-mount resistor series connection, the resistance of these 2 surface-mount resistors is respectively: 61.9K ohm, 7.5K ohm, it is the surface-mount resistor of 4.99K ohm that R13 adopts resistance, and the intrinsic standoff ratio that can calculate the second bleeder circuit is P2=0.067, and under-voltage threshold value A 2 is: A2=S/P2=37.3V; Can find out, when output voltage is 60V, electric current by each resistance is 0.81mA, and the ohmically power of power consumption maximum is 0.81mA * 0.81mA * 61.9K=0.04W, and selection rated power is that 0805 (encapsulation format) surface-mount resistor of 0.125W meets the demands fully.
as shown in Figure 7, IIC control chip in alarm module adopts chip PCA9544, wherein, interrupting input pin/INT0-2 of PCA9544 is respectively by phase inverter and input fault monitoring module, the overcurrent monitoring module, under-voltage monitoring module is connected, interrupting input pin/INT3 of PCA9544 is connected with the overvoltage monitoring module, when arbitrary interrupting input pin (/receive low level signal on INT0-3), PCA9544 can report host computer with look-at-me by interrupt output pin/INT, host computer is by the particular register of access PCA9544 inside, can know which interrupting input pin has received low level signal, thereby know any alarm (power supply input fault alarm has occured, the overcurrent alarm, the overvoltage alarm, undervoltage alarm).Wherein, A0, A1 and A2 pin are the address wires of chip PCA9544.
a kind of direct current source monitoring circuit that above-described embodiment provides, comprise: the input fault monitoring module, the overcurrent monitoring module, the overvoltage monitoring module, under-voltage monitoring module, alarm module and protective tube, the first end of protective tube is connected with the positive output end of direct supply, the input fault monitoring module just is being connected to direct supply, between negative output terminal, the overcurrent monitoring module, overvoltage monitoring module and under-voltage monitoring module are connected between the negative output terminal of the second end of protective tube and direct supply, the input fault monitoring module, the overcurrent monitoring module, output high level when under-voltage monitoring module detects fault, output low level when the overvoltage monitoring module detects fault, alarm module is as receiving the input fault monitoring module, the high level of arbitrary monitoring module output in overcurrent monitoring module and under-voltage monitoring module, or receive the low level of overvoltage monitoring module output, outputting alarm indicator signal.The utility model uses discrete component to realize, supports multiple monitoring function, cost is low and applying flexible.
Need to prove; the utility model also can have other various embodiments; in the situation that do not deviate from the utility model spirit and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the utility model.

Claims (9)

1. direct current source monitoring circuit, described direct supply comprises positive output end and negative output terminal, it is characterized in that, comprising: input fault monitoring module, overcurrent monitoring module, overvoltage monitoring module, under-voltage monitoring module, alarm module and protective tube; Described alarm module is connected with input fault monitoring module, overcurrent monitoring module, overvoltage monitoring module and under-voltage monitoring module;
Described protective tube comprises first end and the second end, and described first end is connected with the positive output end of direct supply;
The input fault monitoring module is connected between the positive and negative output terminal of direct supply, as direct supply no-output as described in detecting, and exports high level;
The overcurrent monitoring module is connected between the negative output terminal of the second end of protective tube and direct supply, as protective tube fusing as described in detecting, and exports high level;
The overvoltage monitoring module is connected between the negative output terminal of the second end of protective tube and direct supply, as described in detecting the output voltage of direct supply greater than default overvoltage threshold, an output low level;
Under-voltage monitoring module is connected between the negative output terminal of the second end of protective tube and direct supply, as described in detecting, the output voltage of direct supply less than a default under-voltage threshold value, is exported high level;
Alarm module, as receive the high level of arbitrary monitoring module output in input fault monitoring module, overcurrent monitoring module and under-voltage monitoring module or receive the low level that the overvoltage monitoring module is exported, outputting alarm indicator signal.
2. direct current source monitoring circuit as claimed in claim 1 is characterized in that:
Described input fault monitoring module comprises: the first photoelectrical coupler U1, current-limiting resistance R1 and pull-up resistor R2; U1 comprises positive input terminal, negative input end, positive output end and negative output terminal;
The positive input terminal of U1 is connected with the second end of R1;
The negative input end of U1 is connected with the negative output terminal of direct supply;
The positive output end of U1 is connected with the second end and the described alarm module of R2;
The negative output terminal ground connection of U1;
The first end of R1 is connected with the positive output end of direct supply;
The first end of R2 is connected with the power supply VCC of described the first photoelectrical coupler U1.
3. direct current source monitoring circuit as claimed in claim 1 is characterized in that:
Described overcurrent monitoring module comprises: the second photoelectrical coupler U2, current-limiting resistance R4 and pull-up resistor R5; U2 comprises positive input terminal, negative input end, positive output end and negative output terminal;
The positive input terminal of U2 is connected with the second end of R4;
The negative input end of U2 is connected with the negative output terminal of direct supply;
The positive output end of U2 is connected with the second end and the described alarm module of R5;
The negative output terminal ground connection of U2;
The first end of R4 is connected with the second end of protective tube;
The first end of R5 is connected with the power supply VCC of described the second photoelectrical coupler U2.
4. direct current source monitoring circuit as claimed in claim 1 is characterized in that:
Described overvoltage monitoring module comprises: the 3rd photoelectrical coupler U3, the first stabilivolt D1, source of stable pressure diode D2, the first bleeder circuit, current-limiting resistance R6 and pull-up resistor R7; U3 comprises positive input terminal, negative input end, positive output end and negative output terminal; D1 comprises negative electrode and anode; D2 comprises negative electrode, anode and the 3rd end; The first bleeder circuit is connected between the negative output terminal of the second end of protective tube and direct supply;
The positive input terminal of U3 is connected with the second end of R6 and the negative electrode of D1;
The negative input end of U3 is connected with the negative electrode of D2;
The positive output end of U3 is connected with the second end and the described alarm module of R7;
The negative output terminal ground connection of U3;
The first end of R6 is connected with the second end of protective tube;
The anode of D1 is connected with the negative output terminal of direct supply;
The anode of D2 is connected with the negative output terminal of direct supply, and the 3rd end of D2 is connected with the dividing point of described the first bleeder circuit;
The first end of R7 is connected with the power supply VCC of described the 3rd photoelectrical coupler U3.
5. direct current source monitoring circuit as claimed in claim 1 is characterized in that:
Described under-voltage monitoring module comprises: the 4th photoelectrical coupler U4, the 3rd stabilivolt D3, source of stable pressure diode D4, the second bleeder circuit, current-limiting resistance R10 and pull-up resistor R11; U4 comprises positive input terminal, negative input end, positive output end and negative output terminal; D3 comprises negative electrode and anode; D4 comprises negative electrode, anode and the 3rd end; The second bleeder circuit is connected between the negative output terminal of the second end of protective tube and direct supply;
The positive input terminal of U4 is connected with the second end of R10 and the negative electrode of D3;
The negative input end of U4 is connected with the negative electrode of D4;
The positive output end of U4 is connected with the second end and the described alarm module of R11;
The negative output terminal ground connection of U4;
The first end of R10 is connected with the second end of protective tube;
The anode of D3 is connected with the negative output terminal of direct supply;
The anode of D4 is connected with the negative output terminal of direct supply, and the 3rd end of D4 is connected with the dividing point of described the second bleeder circuit;
The first end of R11 is connected with the power supply VCC of described the 4th photoelectrical coupler U4.
6. direct current source monitoring circuit as claimed in claim 1 is characterized in that:
Described alarm module comprises IIC control chip, the first phase inverter, the second phase inverter and the 3rd phase inverter; Described IIC control chip comprises the first interrupting input end, the second interrupting input end, the 3rd interrupting input end and the 4th interrupting input end and processing unit;
The first interrupting input end of described IIC control chip is connected with the output terminal of the first phase inverter, and the input end of described the first phase inverter is connected with the input fault monitoring module;
The second interrupting input end of described IIC control chip is connected with the output terminal of the second phase inverter, and the input end of described the second phase inverter is connected with the overcurrent monitoring module;
The 3rd interrupting input end of described IIC control chip is connected with the overvoltage monitoring module;
The 4th interrupting input end of described IIC control chip is connected with the output terminal of the 3rd phase inverter, and the input end of described the 3rd phase inverter is connected with under-voltage monitoring module;
Described processing unit receives low level signal as arbitrary interrupting input end in the first interrupting input end, the second interrupting input end, the 3rd interrupting input end and the 4th interrupting input end of IIC control chip as described in detecting, and exports look-at-me.
7. direct current source monitoring circuit as claimed in claim 1 is characterized in that:
Described alarm module comprises or door, light emitting diode ALARM and phase inverter; Described or door comprises first input end, the second input end, the 3rd input end, four-input terminal and output terminal;
First input end described or door is connected with the input fault monitoring module;
The second input end described or door is connected with the overcurrent monitoring module;
The 3rd input end described or door is connected with the output terminal of phase inverter;
Four-input terminal described or door is connected with under-voltage monitoring module;
Output terminal described or door is connected with the anode of described light emitting diode ALARM;
The input end of phase inverter is connected with the overvoltage monitoring module;
The plus earth of light emitting diode ALARM;
If in first input end, the second input end, the 3rd input end and the four-input terminal of described or door, arbitrary input end receives high level, light emitting diode ALARM lights.
8. direct current source monitoring circuit as claimed in claim 1 is characterized in that:
Also comprise power supply input indicating module, described power supply input indicating module comprises light emitting diode PWR and current-limiting resistance R3;
The anode of described LED P WR is connected with the second end of R3;
The negative electrode of described LED P WR is connected with the negative output terminal of direct supply;
The first end of described current-limiting resistance R3 is connected with the second end of protective tube.
9. direct current source monitoring circuit as claimed in claim 6 is characterized in that:
Described IIC control chip adopts chip PCA9544.
CN 201220646719 2012-11-29 2012-11-29 Direct-current power supply monitoring circuit Expired - Lifetime CN202939292U (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104765005A (en) * 2015-03-10 2015-07-08 国核自仪系统工程有限公司 Circuit conducting self-diagnosis on power sources
CN104881007A (en) * 2015-04-29 2015-09-02 成都英格瑞德电气有限公司 Practical IPC monitoring module device based on IPM electric power
CN106772122A (en) * 2016-12-28 2017-05-31 中核控制系统工程有限公司 A kind of safe level DCS power supplys diversity detection method
CN107395136A (en) * 2017-08-31 2017-11-24 成都四威功率电子科技有限公司 A kind of protection circuit applied to gallium nitride and GaAs Power amplifier
CN108896931A (en) * 2018-05-22 2018-11-27 绵阳市维博电子有限责任公司 A kind of self-diagnosis system for track signal monitoring probe power working condition
CN109188310A (en) * 2018-11-07 2019-01-11 内蒙古电力(集团)有限责任公司乌海电业局 The power module failure monitoring device and system and monitoring method of the electrical secondary system of switchgear
CN109342973A (en) * 2018-11-19 2019-02-15 中车大连电力牵引研发中心有限公司 DC supply input status monitoring circuit and system
CN111913124A (en) * 2020-07-27 2020-11-10 苏州浪潮智能科技有限公司 Circuit for displaying power failure of main board

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104765005A (en) * 2015-03-10 2015-07-08 国核自仪系统工程有限公司 Circuit conducting self-diagnosis on power sources
CN104765005B (en) * 2015-03-10 2019-01-04 国核自仪系统工程有限公司 The circuit of self diagnosis power supply
CN104881007A (en) * 2015-04-29 2015-09-02 成都英格瑞德电气有限公司 Practical IPC monitoring module device based on IPM electric power
CN106772122A (en) * 2016-12-28 2017-05-31 中核控制系统工程有限公司 A kind of safe level DCS power supplys diversity detection method
CN107395136A (en) * 2017-08-31 2017-11-24 成都四威功率电子科技有限公司 A kind of protection circuit applied to gallium nitride and GaAs Power amplifier
CN108896931A (en) * 2018-05-22 2018-11-27 绵阳市维博电子有限责任公司 A kind of self-diagnosis system for track signal monitoring probe power working condition
CN109188310A (en) * 2018-11-07 2019-01-11 内蒙古电力(集团)有限责任公司乌海电业局 The power module failure monitoring device and system and monitoring method of the electrical secondary system of switchgear
CN109342973A (en) * 2018-11-19 2019-02-15 中车大连电力牵引研发中心有限公司 DC supply input status monitoring circuit and system
CN109342973B (en) * 2018-11-19 2022-01-18 中车大连电力牵引研发中心有限公司 Direct current power supply input state monitoring circuit and system
CN111913124A (en) * 2020-07-27 2020-11-10 苏州浪潮智能科技有限公司 Circuit for displaying power failure of main board
CN111913124B (en) * 2020-07-27 2022-06-10 苏州浪潮智能科技有限公司 Circuit for displaying power failure of main board

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