CN215871221U - Power-off delay output power supply - Google Patents
Power-off delay output power supply Download PDFInfo
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- CN215871221U CN215871221U CN202120878316.6U CN202120878316U CN215871221U CN 215871221 U CN215871221 U CN 215871221U CN 202120878316 U CN202120878316 U CN 202120878316U CN 215871221 U CN215871221 U CN 215871221U
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- 238000004146 energy storage Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 56
- 238000005070 sampling Methods 0.000 claims description 9
- 230000001131 transforming effect Effects 0.000 claims description 2
- 230000036039 immunity Effects 0.000 claims 2
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
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Abstract
The utility model provides a power-off delay output power supply which comprises a first rectifying and filtering circuit, a transformer, a second rectifying and filtering circuit, a control circuit and a first switching tube. The energy storage circuit in the first rectifying and filtering circuit continues to discharge for the transformer under the condition that the mains supply is suddenly powered off, so that the power supply time of the load is prolonged under the condition that the mains supply is suddenly powered off, and the load has sufficient time to store the program data.
Description
Technical Field
The utility model relates to the field of power-off protection, in particular to a power-off delay output circuit.
Background
In the conventional power supply use field, under the condition that the power supply is normally loaded, sudden mains supply power failure occurs, and the power supply output is often powered off along with the sudden mains supply power failure for a few milliseconds or even microseconds. Some loads carried by the power supply are program loads, and the program data cannot be stored after the power supply is cut off, so that great loss is caused to users.
In view of the above, how to prolong the power supply time to the load in case of sudden power failure is a technical problem to be solved in the art.
Disclosure of Invention
The utility model aims to provide a power-off delay output power supply.
The utility model aims to solve the problem of prolonging the power supply time of a power supply to a load under the condition of sudden power failure of a mains supply.
In order to solve the problems, the utility model is realized by the following technical scheme:
a power-off delay output power supply comprises a first rectifying and filtering circuit, a transformer, a second rectifying and filtering circuit, a control circuit and a first switch tube, wherein the first rectifying and filtering circuit is used for accessing commercial power and rectifying and filtering the commercial power; the first rectifying and filtering circuit comprises a bridge type rectifying circuit, an energy storage circuit and a filtering circuit which are connected in sequence; the input end of the bridge rectifier circuit is connected with a live wire and a zero line of commercial power, and the energy storage circuit and the filter circuit are connected between the high-voltage output end and the low-voltage output end of the bridge rectifier circuit; the primary side of the transformer is connected with the input end of the first rectifying and filtering circuit and used for transforming and outputting a required voltage value; the output end of the filter circuit is connected with the primary side of the transformer; the second rectifying and filtering circuit is connected with the secondary side of the transformer and used for rectifying and filtering the transformed alternating current output by the transformer to output direct current; the control circuit is connected between the output end of the second rectifying and filtering circuit and the primary side of the transformer and used for adjusting the output of the control pulse according to the output value of the second rectifying and filtering circuit; the first switch tube is connected between the control circuit and the primary side of the transformer and used for being switched on or switched off according to a pulse signal of the control circuit.
The energy storage circuit comprises a twenty-first resistor and a sixth capacitor which are connected to the high-voltage output end of the bridge rectifier circuit, a first capacitor connected with the other end of the twenty-first resistor, a twenty-second resistor connected with the other end of the sixth capacitor, and a second switching tube of which the grid electrode is connected between the twenty-first resistor and the first capacitor, wherein the other end of the first capacitor, the drain electrode of the second switching tube and the other end of the twenty-second resistor are all connected to the low-voltage output end of the bridge rectifier circuit; and the source electrode of the second switching tube is connected between the sixth capacitor and the twenty-second resistor.
Furthermore, the sixth capacitor is an electrolytic capacitor, and the positive electrode of the electrolytic capacitor is connected with the high-voltage output end of the bridge rectifier circuit.
Furthermore, the filter circuit comprises a fifteenth capacitor and a second resistor which are connected in parallel between the high-voltage output end and the low-voltage output end of the bridge rectifier circuit.
Furthermore, the control circuit comprises a sampling unit, a photoelectric coupler and a PWM controller which are connected in sequence; one end of the sampling unit is connected to the output end of the second rectifying and filtering circuit, the other end of the sampling unit is connected to the input end of the first photoelectric coupler, and the output end of the first photoelectric coupler is connected with the PWM controller after being connected with the ninth resistor in series.
Furthermore, the PWM controller is an NCP1380 chip, the first switching tube is an NMOS tube, a grid electrode of the first switching tube is connected with an eleventh resistor in series and then connected to a pin 5 of the PWM controller, a source electrode of the first switching tube is connected with a tenth resistor in series and then connected to a pin 3 of the PWM controller, and a drain electrode of the first switching tube is connected to the primary side of the transformer; and the output end of the first photoelectric coupler is connected with a ninth resistor in series and then is connected with a pin 2 of the PWM controller.
Furthermore, a diode is connected between the drain electrode and the source electrode of the first switching tube, and a seventeenth capacitor is connected in parallel at two ends of the diode.
Furthermore, a twelfth resistor is connected in parallel between the gate and the source of the first switch tube.
Furthermore, the power-off delay output power supply also comprises an EMI anti-interference circuit connected between the mains supply and the first rectifying and filtering circuit, and the EMI anti-interference circuit is used for inhibiting electromagnetic interference of the power supply.
Compared with the prior art, the technical scheme and the beneficial effects of the utility model are as follows:
(1) according to the power-off delay output power supply, mains supply is rectified and filtered by the first rectifying and filtering circuit and then is connected to the primary side of the transformer, the transformer transforms input voltage and outputs a voltage value required by a load, the second rectifying and filtering circuit is connected to the secondary side of the transformer, and the transformed voltage is rectified and filtered to output appropriate direct current to the load. The control circuit is connected between the output end of the second rectifying and filtering circuit and the primary side of the transformer, and adjusts the output of the control pulse according to the output value of the second rectifying and filtering circuit. The first switch tube is connected between the control circuit and the primary side of the transformer and is switched on or off according to a pulse signal of the control circuit. The energy storage circuit in the first rectifying and filtering circuit continues to discharge for the transformer under the condition that the mains supply is suddenly powered off, so that the power supply time of the load is prolonged under the condition that the mains supply is suddenly powered off, and the load has sufficient time to store the program data.
(2) The rectifying and filtering circuit is characterized in that a twenty-first resistor and a sixth capacitor are connected to a high-voltage output end of a bridge rectifying circuit, the other end of the twenty-first resistor is connected with a first capacitor, the other end of the sixth capacitor is connected with a twenty-second resistor, a grid electrode of a second switching tube is connected between the twenty-first resistor and the first capacitor, a source electrode of the second switching tube is connected between the sixth capacitor and the second resistor, and a drain electrode of the second switching tube is connected to a low-voltage output end of the bridge rectifying circuit.
(3) The diode and the seventeenth capacitor are respectively connected in parallel between the source electrode and the drain electrode of the switching tube, the diode is a Schottky diode, the efficiency of the switching tube can be improved, the conduction of the diode in the NMOS tube is prevented, and the seventeenth capacitor is used for absorbing the peak of the switching tube. A twelfth resistor is connected in parallel between the gate and the source of the first switch tube for providing a bias voltage to the first switch tube and simultaneously discharging the static electricity of the first switch tube.
Drawings
FIG. 1 is a block diagram of a power-down delay output power supply according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a first rectifying and filtering circuit according to an embodiment of the present invention;
fig. 3 is a partial circuit diagram of a control circuit according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of a power-off delay output power supply according to an embodiment of the present invention.
Illustration of the drawings:
EMI anti-interference circuit-100; a first rectifying-filtering circuit-200; a transformer-300; a second rectifying-filtering circuit-400; a first switch tube-500.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an outage delay output power supply includes an EMI anti-jamming circuit 100, a first rectifying and filtering circuit 200, a transformer 300, a second rectifying and filtering circuit 400, a control circuit, and a first switching tube 500, where the EMI anti-jamming circuit 100 accesses a live wire and a zero wire of a mains supply to suppress electromagnetic interference in the power supply, and then transmits the mains supply to the first rectifying and filtering circuit 200, and after rectification and filtering by the first rectifying and filtering circuit 200, the mains supply is accessed to a primary side of the transformer 300, the transformer 300 transforms an input voltage to output a voltage value required by a load, and the second rectifying and filtering circuit 400 is connected to a secondary side of the transformer 300 to perform rectifying and filtering on the transformed voltage to output a proper direct current to the load. The control circuit is connected between the output terminal of the second rectifying and smoothing circuit 400 and the primary side of the transformer 300, and adjusts the output of the control pulse according to the output value of the second rectifying and smoothing circuit 400. The first switching tube 500 is connected between the control circuit and the primary side of the transformer 300, and is turned on or off according to a pulse signal of the control circuit.
The first rectifying and filtering circuit comprises a bridge type rectifying circuit, an energy storage circuit and a filtering circuit which are connected in sequence; the input end of the bridge rectifier circuit is connected to the output end of the EMI anti-interference circuit 100, and the high-voltage output end of the filter circuit is connected to the primary side of the transformer. The energy storage circuit comprises a twenty-first resistor R21 and a sixth capacitor C6 which are connected to the high-voltage output end of the bridge rectifier circuit, a first capacitor C1 connected with the other end of the twenty-first resistor R21, a twenty-second resistor R22 connected with the other end of the sixth capacitor C6, and a second switching tube Q2 with a grid connected between the twenty-first resistor R21 and the first capacitor C1, wherein the other end of the first capacitor C1, the drain electrode of the second switching tube Q2 and the other end of the twenty-second resistor R22 are connected to the low-voltage output end of the bridge rectifier circuit. The source of the second switching tube Q2 is connected between the sixth capacitor C6 and the twenty-second resistor R22, and the high-voltage output end of the bridge rectifier circuit is connected to the primary side of the transformer 300. The sixth capacitor C6 is an electrolytic capacitor, and the positive terminal of the sixth capacitor is connected to the high-voltage output terminal of the bridge rectifier circuit. The sixth capacitor C6 is a super capacitor, and can store a large amount of energy to ensure a longer discharge time.
When the mains supply is connected to the mains supply and works normally, the mains supply subjected to rectification filtering is transmitted to the primary side of the transformer 300, is used for supplying power to a load after voltage transformation, and is used for charging the first capacitor C1 through the twenty-first resistor R21. When the voltage of the first capacitor C1, that is, the voltage of the gate to the source of the second switch tube Q2 is less than the gate-on voltage, the input current charges the sixth capacitor R6 through the twelfth resistor R22, the twenty-second resistor R22 limits the charging current of the sixth capacitor C6, the charging current does not exceed the maximum value of the input current divided by the twenty-second resistor R22, when the voltage of the first capacitor C1, that is, the voltage of the gate to the source of the second switch tube Q2 is equal to the input power voltage, the second switch tube Q2 is fully turned on, the charging of the sixth capacitor C6 is completed, and the voltage of the sixth capacitor C6 is equal to the input power voltage.
When the commercial power is cut off, the voltage at the two ends of the sixth capacitor C6 still exists, the second switch tube Q2 continues to maintain the conducting state, the sixth capacitor C6 continues to supply power to the transformer through the second switch tube Q2, namely, the load, and the voltage drop generated due to the fact that the conducting resistance of the second switch tube Q2 is small is far smaller than that of a diode in the bridge rectifier circuit, so that the effective discharge time of the sixth capacitor C6 is prolonged. When the voltage of the sixth capacitor C6 discharges to the gate-on voltage of the second switch Q2, the second switch Q2 is turned off, and the discharge of the sixth capacitor C6 is completed.
In this embodiment, at least one of the twenty-first resistor R21 and the twenty-second resistor R22 is a variable resistor, and the energy storage circuit can be adjusted to an optimal working state by adjusting the resistance value, so as to prolong the discharge time of the sixth capacitor C6 to the maximum extent.
The filter circuit comprises a fifteenth capacitor C15 and a second resistor R2 which are connected in parallel between the high-voltage output end and the low-voltage output end of the bridge rectifier circuit, and the filter circuit is used for filtering the direct current rectified by the bridge rectifier circuit.
The control circuit comprises a sampling unit, a first photoelectric coupler and a PWM controller which are sequentially connected; one end of the sampling unit is connected with the output end of the second rectifying and filtering circuit, and the other end of the sampling unit is connected with the input end of the first photoelectric coupler, namely a light-emitting source pin; and the output end of the first photoelectric coupler, namely a pin of the light receiver is connected with the PWM controller after being connected with a ninth resistor R9 in series.
The control circuit further comprises an overvoltage detection circuit and a second photoelectric coupler, the overvoltage detection circuit is connected to the output end of the second rectifying and filtering circuit 400, the other end of the overvoltage detection circuit is connected with a light source pin of the second photoelectric coupler, and a light receiver pin of the second photoelectric coupler is connected to the PWM controller after being connected with a seventeenth resistor R17 in series.
The PWM controller is an NCP1380 chip, the first switch tube Q1 is an NMOS tube, the grid electrode of the first switch tube Q1 is connected with an eleventh resistor R11 in series and then connected with a pin 5 of the PWM controller, the source electrode of the first switch tube Q1 is connected with a tenth resistor R10 in series and then connected with a pin 3 of the PWM controller, and the drain electrode of the first switch tube Q1 is connected with the primary side of the transformer 300. The output end of the first photoelectric coupler is connected with a ninth resistor R9 in series and then connected to pin 2 of the PWM controller, and the pin of the light receiver of the second photoelectric coupler is connected with a seventeenth resistor R17 in series and then connected to pin 7 of the PWM controller.
A diode is connected between the drain and the source of the first switching tube Q, and a seventeenth capacitor C17 is connected in parallel at two ends of the diode. A twelfth resistor R12 is connected in parallel between the gate and the source of the first switch Q1. The diode is a Schottky diode, the efficiency of the switch tube can be improved, the in-vivo diode of the NMOS tube is prevented from being conducted, and the seventeenth capacitor is used for absorbing the peak of the switch tube. A twelfth resistor is connected in parallel between the gate and the source of the first switch tube for providing a bias voltage to the first switch tube and simultaneously discharging the static electricity of the first switch tube.
The power-off delay output power supply of the embodiment further comprises an OCP overcurrent protection, and a measure protection for executing corresponding protection action when the measured current is increased to exceed an allowable value is preset.
According to the power-off delay output power supply, the energy storage circuit in the first rectifying and filtering circuit continues to discharge for the transformer under the condition that the mains supply is suddenly powered off, so that the power supply time for the load is prolonged under the condition that the mains supply is suddenly powered off, and the load has sufficient time to store the program data.
While the above description shows and describes the preferred embodiments of the present invention, it is to be understood that the utility model is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (9)
1. A power-off delay output power supply, comprising:
the first rectifying and filtering circuit is used for accessing commercial power and rectifying and filtering the commercial power; the first rectifying and filtering circuit comprises a bridge type rectifying circuit, an energy storage circuit and a filtering circuit which are connected in sequence; the input end of the bridge rectifier circuit is connected with a live wire and a zero line of the commercial power, and the energy storage circuit and the filter circuit are connected between the high-voltage output end and the low-voltage output end of the bridge rectifier circuit;
the primary side of the transformer is connected with the input end of the first rectifying and filtering circuit and used for transforming and outputting a required voltage value; the output end of the filter circuit is connected with the primary side of the transformer;
the second rectifying and filtering circuit is connected with the secondary side of the transformer and is used for rectifying and filtering the transformed alternating current output by the transformer and outputting direct current;
the control circuit is connected between the output end of the second rectifying and filtering circuit and the primary side of the transformer and is used for adjusting the output of the control pulse according to the output value of the second rectifying and filtering circuit;
and the first switching tube is connected between the control circuit and the primary side of the transformer and is used for switching on or off according to a pulse signal of the control circuit.
2. A power-off delay output power supply according to claim 1, wherein the energy storage circuit comprises a twenty-first resistor and a sixth capacitor connected to the high-voltage output end of the bridge rectifier circuit, a first capacitor connected to the other end of the twenty-first resistor, a twenty-second resistor connected to the other end of the sixth capacitor, and a second switching tube having a gate connected between the twenty-first resistor and the first capacitor, wherein the other end of the first capacitor, the drain of the second switching tube, and the other end of the twenty-second resistor are connected to the low-voltage output end of the bridge rectifier circuit; the source electrode of the second switch tube is connected between the sixth capacitor and the twenty-second resistor.
3. The power-off delay output power supply according to claim 2, wherein the sixth capacitor is an electrolytic capacitor, and the positive electrode of the electrolytic capacitor is connected to the high-voltage output end of the bridge rectifier circuit.
4. The power-off delay output power supply of claim 1, wherein the filter circuit comprises a fifteenth capacitor and a second resistor connected in parallel between the high-voltage and low-voltage output terminals of the bridge rectifier circuit.
5. The power-off delay output power supply according to claim 1, wherein the control circuit comprises a sampling unit, a first photoelectric coupler and a PWM controller which are connected in sequence; one end of the sampling unit is connected to the output end of the second rectifying and filtering circuit, the other end of the sampling unit is connected to the input end of the first photoelectric coupler, and the output end of the first photoelectric coupler is connected with the PWM controller after being connected with the ninth resistor in series.
6. The power-off delay output power supply according to claim 5, wherein the PWM controller is an NCP1380 chip, the first switch tube is an NMOS tube, a gate of the first switch tube is connected in series with an eleventh resistor and then connected to pin 5 of the PWM controller, a source of the first switch tube is connected in series with a tenth resistor and then connected to pin 3 of the PWM controller, and a drain of the first switch tube is connected to the primary side of the transformer;
and the output end of the first photoelectric coupler is connected with a ninth resistor in series and then is connected with the 2 pins of the PWM controller.
7. The power-off delay output power supply according to claim 1, wherein a diode is connected between the drain and the source of the first switch tube, and a seventeenth capacitor is connected in parallel to two ends of the diode.
8. The power-off delay output power supply according to claim 1, wherein a twelfth resistor is connected in parallel between the gate and the source of the first switch tube.
9. The power down delay output power supply of claim 1, further comprising an EMI immunity circuit connected between the mains power supply and the first rectifying and filtering circuit, wherein the EMI immunity circuit is configured to suppress electromagnetic interference of the power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120878316.6U CN215871221U (en) | 2021-04-26 | 2021-04-26 | Power-off delay output power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120878316.6U CN215871221U (en) | 2021-04-26 | 2021-04-26 | Power-off delay output power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215871221U true CN215871221U (en) | 2022-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120878316.6U Active CN215871221U (en) | 2021-04-26 | 2021-04-26 | Power-off delay output power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215871221U (en) |
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2021
- 2021-04-26 CN CN202120878316.6U patent/CN215871221U/en active Active
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Address after: Room e802a, Taiwan Science and technology enterprise cultivation center, Xiamen Torch hi tech Zone (Xiang'an) Industrial Zone, 361000 Fujian Province Patentee after: Mibo Power (Xiamen) Co.,Ltd. Country or region after: China Address before: Room e802a, Taiwan Science and technology enterprise cultivation center, Xiamen Torch hi tech Zone (Xiang'an) Industrial Zone, 361000 Fujian Province Patentee before: MIBBO (XIAMEN) AUTOMATION TECHNOLOGY CO.,LTD. Country or region before: China |