CN216774369U - Standby power supply - Google Patents
Standby power supply Download PDFInfo
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- CN216774369U CN216774369U CN202123348489.6U CN202123348489U CN216774369U CN 216774369 U CN216774369 U CN 216774369U CN 202123348489 U CN202123348489 U CN 202123348489U CN 216774369 U CN216774369 U CN 216774369U
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Abstract
The utility model relates to a standby power supply, which comprises a voltage conversion module, a battery, a charging management module and also comprises: a current sensing resistor in series with the load; the adjusting module is used for judging whether the alternating current commercial power is normal or not according to the output voltage of the voltage conversion module and adjusting the resistance value of the current detecting resistor according to the judgment result; and the constant current driving module is used for adjusting output current according to the voltage of the current detection resistor, wherein the input end of the constant current driving module is connected with the output end of the voltage conversion module and the battery, the feedback end of the constant current driving module is connected with the current detection resistor, and the output end of the constant current driving module is connected with the load. By implementing the technical scheme of the utility model, the function of outputting different currents when the standby power supply is normally used and applied and used can be realized by pure hardware, so the cost is lower, and the scheme is simple and reliable.
Description
Technical Field
The utility model relates to the field of power supplies, in particular to a standby power supply.
Background
Any building needs to consume a large amount of electric energy to be normally used and operated, and the main source of the electric energy consumed by the building is a national or regional power grid. For a building with a higher power supply level, a sufficient power supply needs to be provided under normal conditions, a sufficient standby power supply needs to be provided when a power supply used normally fails, and when the building encounters an emergency (such as a fire disaster, an earthquake and the like), the standby power supply needs to be provided to guarantee disaster relief and personnel evacuation.
For a standby power supply using a storage battery as a power supply energy source, the requirements on the magnitude of output current are inconsistent when the standby power supply is used normally and used in an emergency, and specifically, when alternating current commercial power is input, a first current is output; when no AC commercial power is input, a second current is output, and the second current is smaller than the first current.
When the standby power supply is required to output different current values in normal use and emergency use, at present, a common method is to output a PWM signal through a single chip to adjust output current. However, this method requires a single chip microcomputer in the standby power supply and a current adjustment program to be written, and therefore, the hardware cost is high and the scheme is complicated.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a standby power supply with low cost and simple and reliable scheme aiming at the defects of high cost and complex scheme in the prior art.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the standby power supply comprises a voltage conversion module, a battery and a charging management module, wherein when an alternating current commercial power is normal, the voltage conversion module converts the alternating current commercial power into a direct current voltage, supplies power to a load and charges the battery through the charging management module; when alternating current commercial power is abnormal, the battery supplies power to the load, and the standby power supply further comprises:
a current sensing resistor in series with the load;
the adjusting module is used for judging whether the alternating current commercial power is normal or not according to the output voltage of the voltage conversion module and adjusting the resistance value of the current detecting resistor according to the judgment result;
and the constant current driving module is used for adjusting output current according to the voltage of the current detection resistor, wherein the input end of the constant current driving module is connected with the output end of the voltage conversion module and the battery, the feedback end of the constant current driving module is connected with the current detection resistor, and the output end of the constant current driving module is connected with the load.
Preferably, the adjusting module includes a switching tube, a parallel resistor, a first voltage-dividing resistor and a second voltage-dividing resistor, wherein a first end of the parallel resistor and a first end of the current-detecting resistor are connected to a feedback end of the constant-current driving module, a second end of the parallel resistor is connected to the first end of the switching tube, a second end of the switching tube and a second end of the current-detecting resistor are grounded together, after the first voltage-dividing resistor and the second voltage-dividing resistor are connected in series, one end of the first voltage-dividing resistor is connected to an output end of the voltage converting module, the other end of the first voltage-dividing resistor is grounded, and a connection point of the first voltage-dividing resistor and the second voltage-dividing resistor is connected to a control end of the switching tube.
Preferably, the voltage conversion module includes an AC input unit, an EMI filtering rectification unit, a DC/DC flyback unit, and a rectifying and filtering unit, which are connected in sequence.
Preferably, the switch tube is an NMOS tube.
Preferably, the switch tube is a switch tube with model number AO 3401.
Preferably, the constant current driving module comprises a BOOST chip with the model number of SY7701 FHC.
Preferably, the constant current driving module further includes a driving switch tube, a first resistor, a second resistor, and a third resistor, wherein the control end of the BOOST chip is connected to the control end of the driving switch tube through the third resistor, the first end of the driving switch tube is connected to the positive end of the load, the second end of the driving switch tube is grounded through the first resistor, the first end of the second resistor is connected to the detection end of the BOOST chip, and the second end of the second resistor is connected to the second end of the driving switch tube.
Preferably, the constant current driving module further includes a fourth resistor and a fifth resistor, wherein after the fourth resistor and the fifth resistor are connected in series, one end of the fourth resistor and the fifth resistor are connected to the positive end of the load, the other end of the fourth resistor and the fifth resistor are grounded, and a connection point of the fourth resistor and the fifth resistor is connected to the voltage protection end of the BOOST chip.
Preferably, the constant current driving module further includes a filter inductor, a first capacitor and a second capacitor, wherein a first end of the filter inductor is connected to the positive terminal of the battery and the positive output terminal of the voltage conversion module, a second end of the filter inductor is connected to the first end of the driving switch tube, the first capacitor is connected to two ends of the battery, and the second capacitor is connected between the positive terminal of the load and the ground.
In the technical scheme provided by the utility model, the adjusting module can judge whether the alternating current mains supply is normal or abnormal according to the output voltage of the voltage conversion module, and adjust the resistance value of the current detection resistor according to the judgment result, and the constant current driving module can adjust the output current according to the voltage on the current detection resistor. The output current adjusting mode can be realized by pure hardware without arranging an MCU in the standby power supply, so the cost is lower, and the scheme is simple and reliable.
Drawings
In order to illustrate the embodiments of the utility model more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort. In the drawings:
FIG. 1 is a logic structure diagram of a first embodiment of a backup power supply of the present invention;
fig. 2 is a partial circuit diagram of a second embodiment of the standby power supply of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In order to meet the requirement that the output current of the standby power supply is inconsistent between normal use and emergency use, the present invention constructs a standby power supply, and as shown in fig. 1, the standby power supply 100 of this embodiment includes a voltage conversion module 10, a charging management module 20, a battery 30, a constant current driving module 40, a current detection resistor 50, and an adjustment module 60. When Alternating Current (AC) is normal, the voltage conversion module 10 converts AC power into dc voltage, supplies power to a load, and charges the battery 30 through the charging management module 20; when the ac mains supply is abnormal, the load is supplied with power from the battery 30. Specifically, a first output terminal of the voltage conversion module 10 is connected to the battery 30 through the charging management module 20, and a second output terminal of the voltage conversion module 10 and the battery 30 are respectively connected to an input terminal of the constant current driving module 40. The voltage conversion module 10 is configured to convert an input Alternating Current (AC) mains into a dc voltage when the AC mains is normal; the charging management module 20 is configured to charge the battery 30 with the dc voltage output by the voltage conversion module 10; the constant current driving module 40 is configured to perform constant current driving on the load using the dc voltage output by the voltage conversion module 10 when the ac mains is normal, and perform constant current driving on the load using the dc voltage output by the battery 30 when the ac mains is abnormal.
In addition, in this embodiment, the current detecting resistor 50 is connected in series with the load; the adjusting module 60 is configured to determine whether the ac mains is normal according to the output voltage of the voltage converting module 10, and adjust the resistance of the current detecting resistor 50 according to the determination result; the constant current driving module 40 is further configured to adjust an output current according to a voltage of the current detection resistor 50, where a feedback end of the constant current driving module 40 is connected to the current detection resistor 50, and an output end of the constant current driving module 40 is connected to a load.
In this embodiment, the adjusting module may determine whether the ac power is normal or abnormal according to the output voltage of the voltage converting module, and adjust the resistance of the current detecting resistor according to the determination result, and the constant current driving module may adjust the output current according to the voltage of the current detecting resistor. Compared with the existing mode of adjusting the duty ratio of the PWM signal through software, the mode of adjusting the output current by adjusting the resistance value of the current detection resistor does not need to set an MCU (microprogrammed control Unit), and can adjust the driving output current when the standby power supply is used in emergency by pure hardware, so that the cost is lower, and the scheme is simple and reliable.
Fig. 2 is a partial circuit diagram of a second embodiment of the backup power supply of the present invention, in which the current-sensing resistor is a resistor R18, one end of which is connected to the negative terminal (L-) of the load, and the other end of which is grounded. The constant current driving module comprises a BOOST chip U1 with the model number SY7701 FHC. Furthermore, the adjusting module 60 includes a switch Q1, a parallel resistor R15, a first voltage-dividing resistor R31, and a second voltage-dividing resistor D33. In addition, the switch Q1 is an NMOS transistor, however, in other embodiments, the BOOST chip may also be a chip of another type, and the switch Q1 may also be a switch of AO3401 or another type. The first divider resistor R31 and the second divider resistor D33 may be resistors with a resistance of 20K.
In this embodiment, after the first end of the parallel resistor R15 is connected to the first end of the current detection resistor R18, the feedback end (FB) of the BOOST chip U1 is connected through the current limiting resistor R25, the second end of the parallel resistor R15 is connected to the drain of the switching tube Q1, and the source of the switching tube Q1 and the second end of the current detection resistor R18 are grounded together. After the first voltage-dividing resistor R31 and the second voltage-dividing resistor R33 are connected in series, one end of the first voltage-dividing resistor R31 is connected to the output end (BBB) of the voltage conversion module, the other end of the first voltage-dividing resistor R31 is grounded, and the connection point of the first voltage-dividing resistor R31 and the second voltage-dividing resistor R33 is connected to the gate of the switching tube Q1.
In this embodiment, the switching tube Q1 is connected in series with the resistor R15 and then connected in parallel with the current detecting resistor R18, the resistors R31 and R33 are connected in series to form a voltage dividing network, the common point is connected with the gate of the switching tube Q1, an external control signal (BBB) is divided by the resistors R31 and R33 to control the switching tube Q1 to be turned on or off, and when an alternating current commercial power is input, the BBB has a secondary DC voltage signal, and is divided by the voltage dividing network of R31 and R33 to turn on the switching tube Q1; when there is no ac mains input, the BBB has no secondary DC voltage signal, and the switching tube Q1 is off. When the switching tube Q1 is switched on (corresponding to normal ac mains supply), the resistance value of the total current detection resistor is the resistance value of the resistor R15 connected in parallel with the resistor R18; when the switching tube Q1 is turned off (corresponding to the ac mains supply abnormality), the total current detection resistor has a resistance value of the resistor R18. The BOOST chip U1 sets the output current value of the driver by the resistance value of the external current detection resistor, specifically, the output current value is the voltage Vcs divided by the resistance value of the total current detection resistor, and the voltage Vcs is the internal set value of the BOOST chip U1, so that the output current value can be adjusted by changing the resistance value of the total current detection resistor, thereby achieving the purpose that the standby power supply can adjust the output current in normal use and emergency use. Moreover, the circuit structure of the adjusting module of the embodiment is simple, the adjustment of the output current in different normal and emergency states can be realized by only adding 4 devices, the realization cost is low, the production complexity is low, and the reliability is high.
Further, referring to fig. 2, the constant current driving module further includes a driving switch Q5, a first resistor R170, a second resistor R21, and a third resistor R30, and the driving switch Q5 may be an NMOS transistor. The control terminal (GATE) of the BOOST chip U1 is connected to the GATE of the driving switch tube Q5 through a third resistor R30, the drain of the driving switch tube Q5 is connected to the positive terminal (L +) of the load through a parallel diode D12, the source of the driving switch tube Q5 is grounded through a first resistor R170, the first terminal of the second resistor R21 is connected to the sensing terminal (CS) of the BOOST chip, and the second terminal of the second resistor R21 is connected to the source of the driving switch tube Q5. The BOOST chip U1 realizes the constant current driving of the load by controlling the on-off of the driving switch tube Q5.
Further, the constant current driving module further includes a fourth resistor R92 and a fifth resistor R23, wherein after the fourth resistor R92 and the fifth resistor R23 are connected in series, one end of the fourth resistor R92 is connected to the positive terminal (L +) of the load, the other end of the fourth resistor R92 is grounded, and a connection point of the fourth resistor R92 and the fifth resistor R23 is connected to the voltage protection terminal (OVP) of the BOOST chip U1. The BOOST chip U1 has a voltage protection function, samples an output voltage through the resistors R92 and R23, and performs voltage protection when the voltage is judged to be greater than a threshold value.
Further, the constant current driving module further comprises a filter inductor L1, a first capacitor C22 and a second capacitor C2, wherein a first end of the filter inductor L1 is connected to the positive terminal of the battery and the positive output terminal (18V) of the voltage conversion module, a second end of the filter inductor L1 is connected to the first end of the driving switch Q5, the first capacitor C22 is connected to two ends of the battery, and the second capacitor C2 is connected between the positive terminal of the load and the ground to perform a voltage stabilizing function.
Further, in an optional embodiment, the voltage conversion module includes an AC input unit, an EMI filtering rectification unit, a DC/DC flyback unit, and a rectifying and filtering unit, which are connected in sequence. In the embodiment, alternating current commercial power is input through an AC input unit, then the alternating current commercial power is converted into direct current after passing through an EMI filtering rectification unit, the direct current commercial power is input into a transformer through a DC/DC flyback monocular, the output of the transformer is converted into stable direct current voltage after passing through a post-stage rectification filtering unit, and then the stable direct current voltage is divided into two paths, wherein one path charges a battery module through a battery charging management module, and the other path supplies power to a constant current driving module. When the alternating current commercial power is abnormal, the battery inputs the power to the constant current driving module.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (9)
1. A standby power supply comprises a voltage conversion module, a battery and a charging management module, wherein when an alternating current commercial power is normal, the voltage conversion module converts the alternating current commercial power into a direct current voltage, supplies power to a load and charges the battery through the charging management module; when exchanging the commercial power unusual, by the battery is for load power supply, its characterized in that, stand-by power supply still includes:
a current sensing resistor in series with the load;
the adjusting module is used for judging whether the alternating current commercial power is normal or not according to the output voltage of the voltage conversion module and adjusting the resistance value of the current detecting resistor according to the judgment result;
and the constant current driving module is used for adjusting output current according to the voltage of the current detection resistor, wherein the input end of the constant current driving module is connected with the output end of the voltage conversion module and the battery, the feedback end of the constant current driving module is connected with the current detection resistor, and the output end of the constant current driving module is connected with the load.
2. The backup power supply according to claim 1, wherein the adjusting module comprises a switching tube (Q1), a parallel resistor (R15), a first voltage dividing resistor (R31) and a second voltage dividing resistor (R33), wherein the first end of the parallel resistor (R15) and the first end of the current detection resistor (R18) are connected with the feedback end of the constant current driving module, the second end of the parallel resistor (R15) is connected with the first end of the switch tube (Q1), a second end of the switching tube (Q1) and a second end of the current detecting resistor (R18) are connected to the ground together, after the first voltage dividing resistor (R31) and the second voltage dividing resistor (R33) are connected in series, one end of the first voltage dividing resistor is connected with the output end of the voltage conversion module, the other end of the first voltage dividing resistor is grounded, the connection point of the first voltage-dividing resistor (R31) and the second voltage-dividing resistor (R33) is connected with the control end of the switch tube (Q1).
3. The backup power supply according to claim 1 or 2, wherein the voltage conversion module comprises an AC input unit, an EMI filter rectification unit, a DC/DC flyback unit, and a rectifier filter unit, which are connected in sequence.
4. The backup power supply of claim 2, wherein the switch transistor (Q1) is an NMOS transistor.
5. The backup power supply of claim 2, wherein said switching tube (Q1) is a model AO3401 switching tube.
6. The backup power supply of claim 2, wherein the constant current driving module comprises a BOOST chip with model number SY7701 FHC.
7. The standby power supply of claim 6, wherein the constant current driving module further comprises a driving switch transistor (Q5), a first resistor (R170), a second resistor (R21), and a third resistor (R30), wherein the control terminal of the BOOST chip is connected to the control terminal of the driving switch transistor (Q5) through the third resistor (R30), the first terminal of the driving switch transistor (Q5) is connected to the positive terminal of the load, the second terminal of the driving switch transistor (Q5) is connected to the ground through the first resistor (R170), the first terminal of the second resistor (R21) is connected to the detection terminal of the BOOST chip, and the second terminal of the second resistor (R21) is connected to the second terminal of the driving switch transistor (Q5).
8. The backup power supply according to claim 7, wherein the constant current driving module further comprises a fourth resistor (R92) and a fifth resistor (R23), wherein after the fourth resistor (R92) and the fifth resistor (R23) are connected in series, one end of the fourth resistor is connected to the positive terminal of the load, the other end of the fourth resistor is grounded, and a connection point of the fourth resistor (R92) and the fifth resistor (R23) is connected to the voltage protection terminal of the BOOST chip.
9. The backup power supply of claim 7, wherein the constant current driving module further comprises a filter inductor (L1), a first capacitor (C22) and a second capacitor (C2), wherein a first terminal of the filter inductor (L1) is connected to the positive terminal of the battery and the positive output terminal of the voltage conversion module, a second terminal of the filter inductor (L1) is connected to the first terminal of the driving switch tube (Q5), the first capacitor (C22) is connected to both terminals of the battery, and the second capacitor (C2) is connected between the positive terminal of the load and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123348489.6U CN216774369U (en) | 2021-12-28 | 2021-12-28 | Standby power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123348489.6U CN216774369U (en) | 2021-12-28 | 2021-12-28 | Standby power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216774369U true CN216774369U (en) | 2022-06-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123348489.6U Active CN216774369U (en) | 2021-12-28 | 2021-12-28 | Standby power supply |
Country Status (1)
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|---|---|
| CN (1) | CN216774369U (en) |
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2021
- 2021-12-28 CN CN202123348489.6U patent/CN216774369U/en active Active
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