CN201374651Y - Switch power supply with warning signal generator circuit - Google Patents
Switch power supply with warning signal generator circuit Download PDFInfo
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- CN201374651Y CN201374651Y CN200920135111U CN200920135111U CN201374651Y CN 201374651 Y CN201374651 Y CN 201374651Y CN 200920135111 U CN200920135111 U CN 200920135111U CN 200920135111 U CN200920135111 U CN 200920135111U CN 201374651 Y CN201374651 Y CN 201374651Y
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 10
- 238000012545 processing Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
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Abstract
The utility model provides a switch power supply with a warning signal generator circuit, which is adaptable to the electronic technical field. The switch power supply comprises an alternating current input circuit, an input rectifying filter circuit, a transformer, an output rectifying circuit, an output rectifying circuit, a filter circuit, a first output circuit, a switch transistor and a driving control circuit, wherein the alternating input circuit, the input rectifying filter circuit, the transformer, the output rectifying circuit, the filter circuit and the first output circuit are sequentially connected, and the switch transistor and the driving control circuit are connected to a primary side of the transformer. The switch power supply further comprises the warning signal generator circuit which is connected with an output end of a secondary side of the transformer, an electric device and a power supply circuit respectively, the warning signal generator circuit detects whether the switch power supply stops supplying or not, if so, then the warning signal generator circuit outputs warning signals to stop power supply to the electric device. As the warning signal generator circuit detects the secondary side of the transformer, directly uses sampled high-frequency switch signals to control a discharge circuit and saves transmission devices such as photoelectric couplers, the switch power supply has the advantages of low cost, small volume and fast speed of warning signal output.
Description
Technical field
The utility model belongs to electronic technology field, relates in particular to a kind of Switching Power Supply that alarm signal produces circuit that has.
Background technology
Along with the development of society, Switching Power Supply is applied in the middle of people's the life widely.When Switching Power Supply is worked, if input ac voltage is stopped power supply, unexpected power down or power supply itself break down, power consumption equipment often requires the circuit of power supply own can guarantee to monitor timely and effectively relevant information, promptly send alarm signal in the certain hour before the output supply power voltage descends, thereby make power consumption equipment have time enough to handle.
In order to detect power failure or fault-signal, at present generally all detect at the primary side of the transformer of Switching Power Supply, consider associated safety problem and system requirements, final detection signal all will be exported from secondary side, so just need detection signal be sent to secondary side by spacer assemblys such as photoelectrical couplers, in side circuit, need provide the accessory power supply control of be correlated with toward contact, can cause Switching Power Supply to exist cost height, volume greatly and alarm signal generation problem fast inadequately like this.
The utility model content
The purpose of this utility model is to provide a kind of Switching Power Supply that alarm signal produces circuit that has, and is intended to solve existingly have that there is the cost height in the Switching Power Supply that alarm signal produces circuit, volume is big and alarm signal produces inadequately problem fast.
The utility model is to realize like this, described Switching Power Supply comprises the ac input circuit that links to each other successively, the input rectifying filter circuit, transformer, output rectification circuit, the filter circuit and first output circuit, and the switching transistor that is connected with the primary side of described transformer, the Drive and Control Circuit of drive control signal is provided for described switching transistor, described Switching Power Supply also comprises respectively the output with the secondary side of described transformer, the alarm signal that power consumption equipment is connected with power supply circuits produces circuit, whether its sense switch power supply will stop power supply, if, the alarm signal that the output expression is stopped power supply is given the alarm signal input of power consumption equipment, and described alarm signal produces circuit and comprises:
The sampling testing circuit that is connected with the output of the secondary side of described transformer;
The discharge circuit that is connected with described sampling testing circuit;
Charging circuit;
Second output circuit that is connected with described power consumption equipment; And
The electric capacity that is connected with described discharge circuit, charging circuit and second output circuit respectively.
In the utility model, whether the alarm signal of Switching Power Supply produces the electric circuit inspection Switching Power Supply and will stop power supply, if, the outputting alarm signal is given the alarm signal input of power consumption equipment, the preceding processing so that power consumption equipment can cut off the power supply, because it is that secondary side to transformer detects that this alarm signal produces circuit, directly use the high-frequency switching signal of sampling that discharge circuit is controlled, do not need conveyers such as photoelectrical coupler, so this Switching Power Supply has, and cost is low, volume is little and the advantage of quick outputting alarm signal.
Description of drawings
Fig. 1 be the utility model embodiment provide have a schematic block circuit diagram that alarm signal produces the Switching Power Supply of circuit;
Fig. 2 be the utility model embodiment provide have an exemplary circuit figure that alarm signal produces the Switching Power Supply of circuit;
Fig. 3 be the utility model embodiment provide have a voltage oscillogram that alarm signal produces the Switching Power Supply of circuit.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 1 shows the theory structure that alarm signal produces the Switching Power Supply of circuit that has that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model.
Switching Power Supply comprises the ac input circuit 100 that links to each other successively, input rectifying filter circuit 200, transformer 300, output rectification circuit 400, the filter circuit 500 and first output circuit 600, and the switching transistor 800 that is connected with the primary side of transformer 300, the Drive and Control Circuit 900 of drive control signal is provided for switching transistor 800, ac input circuit 100 connects AC power, first output circuit 600 connects the power end of power consumption equipment, Switching Power Supply also comprises respectively the output with the secondary side of transformer 300, the alarm signal that power consumption equipment is connected with power supply circuits 1000 produces circuit 700, whether its sense switch power supply will stop power supply, if, the alarm signal that the output expression is stopped power supply is given the alarm signal input of power consumption equipment, wherein, alarm signal produces circuit 700 and comprises: the sampling testing circuit 701 that is connected with the output of the secondary side of transformer 300, the discharge circuit 702 that is connected with sampling testing circuit 701, charging circuit 703, second output circuit 705 that is connected with power consumption equipment, and respectively with discharge circuit 702, charging circuit 703 is connected 705 electric capacity 704 with second output circuit.
Fig. 2 shows the exemplary circuit structure that alarm signal produces the Switching Power Supply of circuit that has that the utility model embodiment provides.
As the utility model one embodiment, alarm signal produces circuit 700 and comprises diode D1, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, first capacitor C 1, second capacitor C 2, the first triode Q1 and the second triode Q2, the anode of diode D1 connects the output of the secondary side of transformer 300, the negative electrode of diode D1 connects first end of first capacitor C 1 respectively by first resistance R 1, first end of second resistance R 2 and the base stage of the first triode Q1, second end of first capacitor C 1 connects first end of the 4th resistance R 4 and the collector electrode of the second triode Q2 respectively, the output of the second termination power supply circuits of the 4th resistance R 4, the second end ground connection of second resistance R 2, the collector electrode of the first triode Q1 is leaded up to the 3rd resistance R 3 and is connect second end of the 4th resistance R 4, one the tunnel connects the base stage of first end and the second triode Q2 of second capacitor C 2 respectively, the grounded emitter of the first triode Q1, the second end ground connection of second capacitor C 2, the grounded emitter of the second triode Q2, the tie point of first end of the 4th resistance R 4 and the collector electrode of the second triode Q2 is the alarm signal output that alarm signal produces circuit 700, and it is connected with the alarm signal input of power consumption equipment.
The operation principle that the alarm signal of the Switching Power Supply that the utility model embodiment provides produces circuit is:
Alarm signal produces circuit 700 and directly detects high-frequency switching signal from the output of the secondary side of switching mode power supply transformer 300 base stage of the first triode Q1 is controlled, during the Switching Power Supply operate as normal, under the control of high-frequency switching signal, the first triode Q1 is in switch working state, during the moment conducting, second capacitor C 2 is by first triode Q1 discharge, moment is when turn-offing, 2 chargings of 3 pairs second capacitor C of the 3rd resistance R, because two branch roads discharge and recharge in turn, the undertension of second capacitor C 2 is so that the second triode Q2 enters conducting state, and alarm signal produces the high level signal of circuit 700 outputs, to powered device Switching Power Supply operate as normal; In case input ac voltage is stopped power supply, unexpected power down or power supply itself break down, cause Switching Power Supply to stop power supply to power consumption equipment, the voltage magnitude of the base stage of the first triode Q1 promptly begins to descend, drop to conducting voltage when following, the first triode Q1 enters cut-off state, the 3rd resistance R 3 will be fast to 2 chargings of second capacitor C in a switch periods, make the second triode Q2 enter the saturation conduction state fast, the signal that alarm signal produces circuit 700 outputs becomes the low level alarm signal from high level signal, be about to quit work to the powered device Switching Power Supply, and this moment, Switching Power Supply still can be kept normal output voltage certain hour, the preceding processing so that power consumption equipment can cut off the power supply.The direct sample high-frequency switching signal is controlled the first triode Q1 and is made the utility model can be than by alternate manner outputting alarm signal more quickly.Fig. 3 shows the voltage waveform that alarm signal produces the Switching Power Supply of circuit that has that the utility model embodiment provides, the output voltage of base voltage, alarm signal and first output circuit 600 that comprises base voltage, the second triode Q2 of the first triode Q1, wherein, T represents to export the preceding advanced warning time of power down.
In the utility model embodiment, whether the alarm signal of Switching Power Supply produces the electric circuit inspection Switching Power Supply and will stop power supply, if, the outputting alarm signal is given the alarm signal input of power consumption equipment, the preceding processing so that power consumption equipment can cut off the power supply, because it is that secondary side to transformer detects that this alarm signal produces circuit, directly use the high-frequency switching signal of sampling that discharge circuit is controlled, do not need conveyers such as photoelectrical coupler, so this Switching Power Supply has, and cost is low, volume is little and the advantage of quick outputting alarm signal.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (2)
1, a kind of Switching Power Supply with alarm signal generation circuit, described Switching Power Supply comprises the ac input circuit that links to each other successively, the input rectifying filter circuit, transformer, output rectification circuit, the filter circuit and first output circuit, and the switching transistor that is connected with the primary side of described transformer, the Drive and Control Circuit of drive control signal is provided for described switching transistor, it is characterized in that, described Switching Power Supply also comprises respectively the output with the secondary side of described transformer, the alarm signal that power consumption equipment is connected with power supply circuits produces circuit, whether its sense switch power supply will stop power supply, if, the alarm signal that the output expression is stopped power supply is given the alarm signal input of power consumption equipment, and described alarm signal produces circuit and comprises:
The sampling testing circuit that is connected with the output of the secondary side of described transformer;
The discharge circuit that is connected with described sampling testing circuit;
Charging circuit;
Second output circuit that is connected with described power consumption equipment; And
The electric capacity that is connected with described discharge circuit, charging circuit and second output circuit respectively.
2, Switching Power Supply as claimed in claim 1, it is characterized in that, described alarm signal produces circuit and comprises diode, first resistance, second resistance, the 3rd resistance, the 4th resistance, first electric capacity, second electric capacity, first triode and second triode, the anode of described diode connects the output of the secondary side of described transformer, the negative electrode of described diode connects first end of described first electric capacity respectively by described first resistance, first end of second resistance and the base stage of first triode, second end of described first electric capacity connects first end of described the 4th resistance and the collector electrode of second triode respectively, the output of the described power supply circuits of second termination of described the 4th resistance, the second end ground connection of described second resistance, the collector electrode of described first triode is leaded up to described the 3rd resistance and is connect second end of the 4th resistance, one the tunnel connects the base stage of first end and second triode of described second electric capacity respectively, the grounded emitter of described first triode, the second end ground connection of described second electric capacity, the grounded emitter of described second triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920135111U CN201374651Y (en) | 2009-02-27 | 2009-02-27 | Switch power supply with warning signal generator circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920135111U CN201374651Y (en) | 2009-02-27 | 2009-02-27 | Switch power supply with warning signal generator circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201374651Y true CN201374651Y (en) | 2009-12-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920135111U Expired - Fee Related CN201374651Y (en) | 2009-02-27 | 2009-02-27 | Switch power supply with warning signal generator circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201374651Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802630A (en) * | 2018-05-29 | 2018-11-13 | 大山科技有限公司 | A kind of initiative alarming circuit of bus power source |
| CN110824377A (en) * | 2019-12-13 | 2020-02-21 | 杭州协能科技股份有限公司 | Detection circuit of switching power supply |
-
2009
- 2009-02-27 CN CN200920135111U patent/CN201374651Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802630A (en) * | 2018-05-29 | 2018-11-13 | 大山科技有限公司 | A kind of initiative alarming circuit of bus power source |
| CN110824377A (en) * | 2019-12-13 | 2020-02-21 | 杭州协能科技股份有限公司 | Detection circuit of switching power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091230 Termination date: 20140227 |