CN215300483U - Switching power supply comprising instantaneous power-off module - Google Patents
Switching power supply comprising instantaneous power-off module Download PDFInfo
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- CN215300483U CN215300483U CN202023338549.1U CN202023338549U CN215300483U CN 215300483 U CN215300483 U CN 215300483U CN 202023338549 U CN202023338549 U CN 202023338549U CN 215300483 U CN215300483 U CN 215300483U
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Abstract
The utility model discloses a switching power supply including power-off module in twinkling of an eye. The instantaneous power-off module is arranged between the grounding end of the output side filter capacitor and the second end of the load; the non-grounding end of the filter capacitor is connected with the first end of the load; the instantaneous power-off module comprises an alternating current sampling circuit, a photoelectric coupling circuit and a controlled switch circuit which are connected in sequence; the alternating current sampling circuit samples an alternating current source; the input end of the photoelectric coupler receives a sampling signal from the alternating current sampling circuit, and the output end of the photoelectric coupler is connected with the control end of the controlled switch circuit; two output ends of the controlled switch circuit are respectively connected with a first end of the load and a second end of the load. The utility model discloses can cut off the power supply in the twinkling of an eye, increase substantially conversion efficiency to it is extravagant to have reduced the energy.
Description
Technical Field
The utility model relates to an electronic circuit especially relates to a switching power supply including outage module in the twinkling of an eye.
Background
The switch power supply is similar to the heart of a human body, basically all power supply equipment can not be switched on, the switch power supply is developed for more than half a century from the beginning of the last 50 th century to the present, and the switch power supply gradually replaces a continuous working power supply manufactured by the traditional technology due to the advantages of small volume, light weight, high efficiency, low heat productivity, stable performance and the like, and is widely applied to electronic complete machines and equipment.
With the development of society, people all pursue a comfortable life, and in the aspect of sanitary ware, people also develop towards automation. The power supply used by the traditional automatic induction flushing system for the toilet stool and the urine stool is divided into a power frequency power supply and a dry battery, the power frequency power supply is large in size, low in conversion efficiency, short in service time of the dry battery and easy to damp and corrode.
The switching power supply module is introduced for solving the problems of the traditional power frequency power supply. Compared with the efficiency conversion of the traditional power frequency power supply, under the same load of the current of the output power supply, the conversion efficiency of the traditional power supply is about 62%, and the conversion efficiency of the switching power supply module is as high as about 86%, so that the energy is greatly saved, and the traditional power supply module can be directly replaced under the condition of not changing the appearance package and any electrical performance of the traditional power supply.
The output of the existing switching power supply for auto-induction is generally ac input dc output, and the signal at the dc output terminal is generally filtered by a filter circuit before being finally output, and the filter circuit generally includes a capacitor device. The automatic induction device of the toilet stool can control the power supply to be cut off after the automatic induction device can not induce the existence of a user, but the capacitor can still serve as the power supply to continue power supply after the alternating current power supply is cut off due to the existence of the capacitor device at the output end, so that the flushing device can not be quickly cut off instantly, and water resource waste is caused.
Disclosure of Invention
The purpose of the invention is as follows: the utility model aims at providing a switching power supply including outage module in the twinkling of an eye to solve the problem that current switching power supply module can't cut off the power supply rapidly after cutting off the alternating current source.
The technical scheme is as follows: in one aspect, the utility model discloses a power off module in twinkling of an eye. The instantaneous power-off module is arranged between the grounding end of the output side filter capacitor and the second end of the load; the non-grounding end of the filter capacitor is connected with the first end of the load; the instantaneous power-off module comprises an alternating current sampling circuit, a photoelectric coupling circuit and a controlled switch circuit which are connected in sequence; the alternating current sampling circuit samples an alternating current source; the input end of the photoelectric coupler receives a sampling signal from the alternating current sampling circuit, and the output end of the photoelectric coupler is connected with the control end of the controlled switch circuit; two output ends of the controlled switch circuit are respectively connected with a first end of the load and a second end of the load.
Further, the alternating current sampling circuit comprises a first diode D1, a first resistor R1 and a second resistor R2 which are connected in series between the live wire end and the neutral wire end of the alternating current source.
Further, the photoelectric coupling circuit comprises a light emitting diode U4B, a photosensitive diode U4A, a third resistor R3 and a fourth resistor R4; the light emitting diode is connected with the second resistor R2 in parallel; one end of the photosensitive diode is connected with the one end of the filter capacitor, and the other end of the photosensitive diode is grounded via a third resistor R33 and a fourth resistor R4 which are connected in series.
Further, the controlled switching circuit comprises a bidirectional MOS tube switching circuit; the gates of two MOS tubes in the bidirectional MOS tube switch circuit are connected to the connection point of the third resistor R3 and the fourth resistor R4; the drains of two MOS tubes in the bidirectional MOS tube switching circuit are both connected to the second end of the load; the source electrodes of the two MOS tubes in the bidirectional MOS tube switching circuit are grounded.
Further, the instantaneous power-off module further includes a capacitor C14 connected in parallel with the fourth resistor R4.
On the other hand, the utility model relates to a switching power supply including above-mentioned outage module in twinkling of an eye. The switching power supply also comprises an AC-DC conversion module, a transformer and a filter circuit; the input end of the AC-DC conversion module is electrically connected with an alternating current source; the primary winding of the transformer is electrically connected with the direct current output end of the AC-DC conversion module; the synonym end and the homonymous end of the secondary side of the transformer are respectively connected with the first input end and the second input end of the filter circuit; the filter circuit comprises the filter capacitor C10B, a filter inductor L2 and a second filter capacitor C10; the first end of the filter inductor L2 and the first end of the second filter capacitor C10 are both connected with the synonym end of the secondary winding of the transformer; a second end of the second filter capacitor C10 and a second end of the filter capacitor C10B are both connected with the same-name end of the secondary winding of the transformer; the second terminal of the filter inductor L2 is connected to the first terminal of the filter capacitor C10B.
Further, the switching power supply further comprises a feedback module, a switching tube Q1 and a PWM control module; a first input end and a second input end of the feedback module are respectively connected with a first end and a second end of the load; the input end of the PWM control module is connected with the output end of the feedback module; the output end of the PWM control module is connected with the driving end of the switching tube Q1; and the source electrode of the switching tube is connected with the dotted terminal of the primary winding of the transformer, and the drain electrode of the switching tube is grounded through the series resistor.
Further, the switching power supply further includes a schottky diode D2, a fifth resistor R5, and a third capacitor C9; a first end of the filter inductor L2 is connected to the synonym terminal of the secondary winding of the transformer via the Schottky diode D2; the fifth resistor R5 and the third capacitor C9 are connected in series and then connected in parallel with the Schottky diode D2.
Has the advantages that: under the condition of the same load of output power supply current, the conversion efficiency of the traditional power supply is about 58%; compared with the traditional power supply, the switching power supply module comprising the instant power-off module has the conversion efficiency as high as about 86 percent, greatly improves the conversion efficiency, reduces energy waste, and can be directly replaced under the condition of not changing the appearance package and any electrical performance of the traditional power supply; furthermore, because the utility model discloses can cut off the power supply in the twinkling of an eye, can reduce the water waste after popularizing and applying by a wide margin.
Drawings
Fig. 1 is a schematic structural diagram of the switching power supply of the present invention;
fig. 2 is the schematic structural diagram of the instant power-off module of the present invention.
Detailed Description
The following is a detailed description of the present invention with reference to the accompanying drawings.
As shown in fig. 1, the switching power supply of the present invention includes: the device comprises an AC-DC conversion module, a transformer, a filter circuit and an instant power-off module. The input end of the AC-DC conversion module is electrically connected with an alternating current source; the primary winding of the transformer is electrically connected with the direct current output end of the AC-DC conversion module; the different-name end and the same-name end of the secondary side of the transformer are respectively connected with the first input end and the second input end of the filter circuit; the filter circuit comprises a filter capacitor C10B, a filter inductor L2 and a second filter capacitor C10; the first end of the filter inductor L2 and the first end of the second filter capacitor C10 are both connected with the synonym end of the secondary winding of the transformer; the second end of the second filter capacitor C10 and the second end of the filter capacitor C10B are both connected with the dotted end of the secondary winding of the transformer; the second terminal of the filter inductor L2 is connected to the first terminal of the filter capacitor C10B. The instantaneous power-down module is located between the filter capacitor C10B and the load. The first terminal of the filter capacitor C10B is connected to the first terminal V + of the load, and the second terminal of the filter capacitor C10B is grounded and connected to the second terminal V-of the load via the momentary power-off module.
In order to better modulate the output voltage, the switching power supply further comprises a feedback module, a switching tube Q1 and a PWM control module; a first input end and a second input end of the feedback module are respectively connected with a first end and a second end of the load; the input end of the PWM control module is connected with the output end of the feedback module; the output end of the PWM control module is connected with the driving end of a switching tube Q1; the source electrode of the switching tube Q1 is connected with the same-name end of the primary winding of the transformer, and the drain electrode is grounded through a series resistor. Thus, the operation of the output side of the transformer can be fed back to the PWM control module, and the PWM control module controls the switching tube Q1 to determine the operation of the output voltage and current. In this embodiment, the feedback module and the PWM control module are conventional and are common in general switching power supplies, and detailed description of specific circuit structures thereof is omitted here.
In addition, the switching power supply further comprises a schottky diode D2, a fifth resistor R5 and a capacitor C9. A first terminal of the filter inductor L2 is connected to the synonym terminal of the secondary winding of the transformer via a schottky diode D2. The fifth resistor R5 and the capacitor C9 are connected in series and then connected in parallel with the Schottky diode D2.
As shown in fig. 2, the instant power-off module of the present invention includes an ac sampling circuit, a photoelectric coupling circuit and a controlled switch circuit which are connected in sequence. The AC sampling circuit samples an AC source; the input end of the photoelectric coupler receives a sampling signal from the alternating current sampling circuit, and the output end of the photoelectric coupler is connected with the control end of the controlled switching circuit; two output ends of the controlled switch circuit are respectively connected with the other end of the filter circuit and a second end V-of the load.
The alternating current sampling circuit comprises a first diode D1, a first resistor R1 and a second resistor R2 which are connected in series between a live wire end and a zero wire end of an alternating current source. In this embodiment, the resistance of R1 is 560K, and the resistance of R2 is 10K. In other embodiments, the resistances of R1 and R2 may have other values.
The photoelectric coupling circuit comprises a light emitting diode U4B, a photosensitive diode U4A, a capacitor C14, a third resistor R3 and a fourth resistor R4. The light emitting diode U4B is connected in parallel with the second resistor R2. One end of the photodiode U4A is connected to one end of the filter capacitor C10B, and the other end of the photodiode U4A is connected to ground via a third resistor R3 and a fourth resistor R4 connected in series. The capacitor C14 is connected in parallel with the fourth resistor R4. In this embodiment, the capacitance of C14 is 14 uF. In other embodiments, the capacitance value of C14 may take other values. The capacitor C14 can make the signal input to the control terminal of the controlled switch circuit more stable.
In this embodiment, the controlled switching circuit preferably includes a bidirectional MOS transistor switching circuit. The gates G1 and G2 of two MOS tubes in the bidirectional MOS tube switch circuit are both connected to the connection point of the third resistor R3 and the fourth resistor R4. The drains D1 and D2 of two MOS tubes in the bidirectional MOS tube switch circuit are both connected to the second end V-of the load. The sources S1 and S2 of two MOS tubes in the bidirectional MOS tube switch circuit are both grounded. In this embodiment, the resistances of R3 and R4 are 3.3K and 100K, respectively. In other embodiments, the resistance values of R3 and R4 may take other values. The bidirectional MOS tube switching circuit adopts a connection mode that two MOS tubes are connected in parallel so as to improve the overcurrent capacity of the MOSFET switching circuit, and two groups of two MOS tubes connected in parallel adopt a back-to-back connection mode. In other embodiments, the controlled switching circuit may employ only one MOS transistor.
The working principle is as follows: when the alternating current source supplies power normally, the alternating current source, a common diode D4 in the alternating current sampling circuit and a light emitting diode U4B in the photoelectric coupler form a passage, so that the light emitting diode U4B is conducted to emit light; the photodiode U4A detects the light signal of the light emitting diode U4B and turns on, so that a path is formed between the first terminal V + (or the first terminal of the filter capacitor) of the load and the ground GND, so that the control terminal of the controlled switch circuit (i.e. the two gates G1 and G2 of the bidirectional MOS switch circuit) receives the control signal, and the second terminal V-of the load is connected to the ground GND, and thus a path is formed between the second terminal of the filter capacitor and the second terminal of the load, and power is supplied to the load. When the alternating current source is cut off, the alternating current sampling circuit in the instantaneous power-off module can detect the cut-off of the alternating current source in time; at this time, the light emitting diode U4B is turned off, the photodiode U4A is turned off because the light signal of the light emitting diode U4B is not detected, so that the voltage input to the control terminal of the controlled switching circuit is reduced, and the controlled switching circuit is turned off, thereby instantaneously cutting off the path between the second terminal V-of the load and the second terminal of the filter capacitor at the output terminal connected to the ground, so that the electric energy stored in the filter capacitor can not supply power to the load any more.
Claims (8)
1. A switching power supply comprising an instantaneous power-off module, characterized in that it is arranged between the ground terminal of the output-side filter capacitor (C10B) and the second terminal of the load; the non-grounding end of the filter capacitor is connected with the first end of the load; the instantaneous power-off module comprises an alternating current sampling circuit, a photoelectric coupling circuit and a controlled switch circuit which are connected in sequence; the alternating current sampling circuit samples an alternating current source; the input end of the photoelectric coupler receives a sampling signal from the alternating current sampling circuit, and the output end of the photoelectric coupler is connected with the control end of the controlled switch circuit; two output ends of the controlled switch circuit are respectively connected with a first end of the load and a second end of the load.
2. The switching power supply as in claim 1, wherein the ac sampling circuit comprises a first diode (D1), a first resistor (R1), and a second resistor (R2) connected in series between the line and neutral terminals of the ac source.
3. The switching power supply as claimed in claim 2, wherein the photocoupling circuit comprises a light emitting diode (U4B), a photodiode (U4A), a third resistor (R3) and a fourth resistor (R4); the light emitting diode is connected in parallel with the second resistor (R2); one end of the photosensitive diode is connected with the non-grounding end of the filter capacitor, and the other end of the photosensitive diode is grounded through a third resistor (R3) and a fourth resistor (R4) which are connected in series.
4. The switching power supply comprising an instantaneous power-off module according to claim 3, wherein the controlled switching circuit comprises a bidirectional MOS transistor switching circuit; the gates of two MOS tubes in the bidirectional MOS tube switch circuit are connected to the connection point of the third resistor (R3) and the fourth resistor (R4); the drains of two MOS tubes in the bidirectional MOS tube switching circuit are both connected to the second end of the load; the source electrodes of the two MOS tubes in the bidirectional MOS tube switching circuit are grounded.
5. A switching power supply comprising a momentary power loss module according to claim 3, further comprising a capacitor (C14) connected in parallel with the fourth resistor (R4).
6. A switching power supply comprising an instantaneous power-off module according to any one of claims 1 to 5, characterized by further comprising an AC-DC conversion module, a transformer, a filter circuit; the input end of the AC-DC conversion module is electrically connected with an alternating current source; the primary winding of the transformer is electrically connected with the direct current output end of the AC-DC conversion module; the synonym end and the homonymous end of the secondary side of the transformer are respectively connected with the first input end and the second input end of the filter circuit; the filter circuit comprises the filter capacitor (C10B), a filter inductor (L2) and a second filter capacitor (C10); the first end of the filter inductor (L2) and the first end of the second filter capacitor (C10) are both connected with the synonym end of the secondary winding of the transformer; a second end of the second filter capacitor (C10) and a second end of the filter capacitor (C10B) are both connected with the same-name end of the secondary winding of the transformer; the second end of the filter inductor (L2) is connected with the first end of the filter capacitor (C10B).
7. The switching power supply comprising an instantaneous power-off module according to claim 6, further comprising a feedback module, a switching tube (Q1) and a PWM control module; a first input end and a second input end of the feedback module are respectively connected with a first end and a second end of the load; the input end of the PWM control module is connected with the output end of the feedback module; the output end of the PWM control module is connected with the driving end of the switch tube (Q1); and the source electrode of the switching tube is connected with the dotted terminal of the primary winding of the transformer, and the drain electrode of the switching tube is grounded through the series resistor.
8. A switching power supply comprising a momentary power-off module according to claim 6, further comprising a Schottky diode (D2), a fifth resistor (R5) and a third capacitor (C9); a first end of the filter inductor (L2) is connected to a synonym terminal of a secondary winding of the transformer via the Schottky diode (D2); the fifth resistor (R5) and the third capacitor (C9) are connected in series and then connected in parallel with the Schottky diode (D2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023338549.1U CN215300483U (en) | 2020-12-31 | 2020-12-31 | Switching power supply comprising instantaneous power-off module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023338549.1U CN215300483U (en) | 2020-12-31 | 2020-12-31 | Switching power supply comprising instantaneous power-off module |
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| Publication Number | Publication Date |
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| CN215300483U true CN215300483U (en) | 2021-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023338549.1U Active CN215300483U (en) | 2020-12-31 | 2020-12-31 | Switching power supply comprising instantaneous power-off module |
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| CN (1) | CN215300483U (en) |
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- 2020-12-31 CN CN202023338549.1U patent/CN215300483U/en active Active
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