CN112578834A - Output voltage stabilizing circuit - Google Patents
Output voltage stabilizing circuit Download PDFInfo
- Publication number
- CN112578834A CN112578834A CN201910934313.7A CN201910934313A CN112578834A CN 112578834 A CN112578834 A CN 112578834A CN 201910934313 A CN201910934313 A CN 201910934313A CN 112578834 A CN112578834 A CN 112578834A
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- output
- voltage
- power supply
- standby power
- bjt
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
Abstract
An output voltage stabilizing circuit is connected with a standby power supply module of a power supply and comprises a voltage dividing unit, a second resistor, a switching element and a voltage stabilizing element. The voltage dividing unit has a voltage dividing node having a voltage dividing potential. The voltage stabilizing element is connected with the voltage dividing node and the switch element, the voltage stabilizing element has a reference potential, and the voltage stabilizing element has a first state which enables the switch element to be switched off when the divided voltage potential is smaller than the reference potential and a second state which enables the switch element to be switched on when the divided voltage potential is larger than the reference potential. When the load of the standby power supply module changes and the divided voltage potential is larger than the reference potential due to the change of the standby power, the switch element is conducted to enable the second resistor to serve as the load of the standby power supply module, and the standby power is stabilized.
Description
Technical Field
The present invention relates to an output voltage regulator, and more particularly, to an output voltage regulator that can provide a transient load to a standby power supply module of a power supply to stabilize standby power.
Background
As disclosed in CN 204030944U and taiwan patent No. TW I309103, various prior arts disclose that a temporary load is incorporated into a standby power supply module when the power supply is in standby mode, so that the power supply can be normally started, and the temporary load is controlled and separated from a power supply loop of the standby power supply module after the power supply is started, so as to prevent the temporary load from generating excessive loss when the standby power supply module supplies power, thereby reducing the overall efficiency of the power supply.
However, as disclosed in CN 202995621U and TW I411911 in taiwan, the prior art generally determines whether the temporary load is incorporated into the Power supply circuit of the regular Power supply module based on an on/off signal (Ps _ on) provided by a load to the Power supply or a Power _ good signal (Power _ good) provided by the Power supply to the load, which is helpful to improve the quality of the regular Power supply but also causes continuous loss.
Furthermore, CN 103560675a discloses a power output control circuit, which compares a voltage divided by a first voltage dividing resistor R3 and a second voltage dividing resistor R4 with a reference voltage established by a voltage reference control chip Q3, and when the divided voltage is higher than the reference voltage, the voltage reference control chip Q3 generates a current to turn on a transistor Q1 connected to the voltage reference control chip Q3, so that a load can receive the power provided by the power circuit a. However, the load is actually the main power supply object of the power circuit a, and is not a temporary load for stabilizing the output voltage of the power circuit a.
Disclosure of Invention
The main objective of the present invention is to solve the problem of poor power supply quality caused by the conventional circuit unable to stabilize the backup power outputted by the backup power supply module.
To achieve the above objective, the present invention provides an output voltage stabilizing circuit, which is connected to an output side of a standby power supply module of a power supply, the standby power supply module is provided with an output positive electrode and an output negative electrode on the output side, the standby power supply module outputs a standby power after being started, and the output voltage stabilizing circuit includes a voltage dividing unit, a second resistor, a switching element and a voltage stabilizing element. The voltage division unit is respectively connected with the output anode and the output cathode and receives the standby power, the voltage division unit is composed of at least two first resistors which are arranged in series, a voltage division node is arranged between the first resistors, and the voltage division node has a voltage division potential. One end of the second resistor is connected with the output cathode, and the switch element is provided with a first connecting end connected with the output anode, a second connecting end connected with the second resistor and a control end which is controlled to enable the first connecting end and the second connecting end to be conducted or cut off. The voltage stabilizing element is provided with a third connecting end connected with the control end, a fourth connecting end connected with the output cathode and a reference end connected with the voltage dividing node to receive the divided voltage potential, the voltage stabilizing element is set with a reference potential, and the voltage stabilizing element is provided with a first state which enables the control end not to obtain the current required by work when the divided voltage potential is less than the reference potential and a second state which enables the control end to obtain the current required by work when the divided voltage potential is more than the reference potential. When the load of the standby power supply module changes and the divided voltage potential is larger than the reference potential due to the change of the standby power, the switch element is conducted to enable the second resistor to serve as one load of the standby power supply module so as to stabilize the standby power.
In one embodiment, the voltage regulator is a voltage regulator transistor.
In one embodiment, at least one of the first resistors between the voltage dividing node and the output cathode has a smaller resistance than at least one of the first resistors between the voltage dividing node and the output anode.
In one embodiment, the output voltage stabilizing circuit has a third resistor connected to the first connection terminal and the control terminal.
In one embodiment, the switch device is a Bipolar Junction Transistor (BJT), the first connection terminal is an emitter of the bipolar junction transistor, the second connection terminal is a collector of the bipolar junction transistor, and the control terminal is a base of the bipolar junction transistor.
In one embodiment, the voltage regulator output circuit has a fourth resistor disposed between the voltage regulator element and the switching element.
Through the implementation of the invention, compared with the prior art, the invention has the following characteristics: when the load of the stock power supply module changes and the voltage-dividing potential is larger than the reference potential due to the change of the stock power, the output voltage stabilizing circuit enables the second resistor to be used as one load of the stock power supply module so as to digest temporarily increased electric energy and stabilize the output quality of the stock power. In addition, when the load of the stock power supply module does not change the stock power to a level that the divided voltage potential is larger than the reference potential, the second resistor is not electrically connected with the output side of the stock power supply module, thereby effectively avoiding the generation of extra loss and improving the overall efficiency of the power supply.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a power supply according to the present invention;
FIG. 2 is a schematic circuit diagram of an embodiment of the present invention;
FIG. 3 is a timing diagram illustrating operation of an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating an embodiment of the present invention in a second state;
fig. 5 is a schematic diagram of the first embodiment of the present invention.
The
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111. A
A
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The first connecting end is connected with the first connecting end in a first-kind-subject-to-subject manner
A
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A
142
A
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The
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A
214
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The
The method includes the steps of 40
Detailed Description
The present invention is described in detail and technical content with reference to the accompanying drawings, wherein:
referring to fig. 1 and fig. 2, the present invention provides an output voltage stabilizing circuit 100, wherein the output voltage stabilizing circuit 100 is disposed in a power supply 200 and connected to a standby power supply module 21 disposed in the power supply 200, and further, the output voltage stabilizing circuit 100 is connected to an output side 211 of the standby power supply module 21. It should be noted that the backup power supply module 21 is activated when receiving the power provided by the external power source, and the output side 211 outputs a backup power 212, where the backup power 212 is commonly referred to as 5VSB, that is, the backup power supply module 21 is different from a main power supply module 22 disposed in the power supply 200. Also, the backup power supply module 21 has an output anode 213 and an output cathode 214 on the output side 211, and in one embodiment, the output cathode 214 may be grounded.
On the other hand, the output voltage stabilizing circuit 100 of the present invention includes a voltage dividing unit 11, a second resistor 12, a switching element 13 and a voltage stabilizing element 14. The two ends of the voltage dividing unit 11 are respectively connected to the output anode 213 and the output cathode 214, the voltage dividing unit 11 is composed of at least two first resistors 111 and 112 connected in series, a voltage dividing node 113 is disposed between the first resistors 111 and 112, and the voltage dividing node 113 has a voltage dividing potential. Although the embodiments disclosed in the drawings are only illustrated by the number two of the first resistors 111 and 112, the invention is not limited thereto.
On the other hand, one end of the second resistor 12 is connected to the switching element 13, and the other end is connected to the output cathode 214. When the switch element 13 is turned on, the second resistor 12 is electrically connected to the standby power supply module 21 and can be used as one of the loads of the standby power supply module 21 to stabilize the output quality of the standby power 212.
Referring to fig. 2, the switch element 13 has a first connection end 131 connected to the output anode 213, a second connection end 132 connected to the second resistor 12, and a control end 133 for controlling the connection or disconnection between the first connection end 131 and the second connection end 132. For example, the switch element 13 may be a Bipolar Junction Transistor (BJT), the first connection terminal 131 is an Emitter (Emitter) of the BJT, the second connection terminal 132 is a Collector (Collector) of the BJT, and the control terminal 133 is a Base (Base) of the BJT. Furthermore, in one embodiment, the output voltage regulator 100 has a third resistor 15 connected between the first connection terminal 131 and the control terminal 133.
Accordingly, the voltage regulator 14 has a third connection terminal 141 connected to the control terminal 133, a fourth connection terminal 142 connected to the output cathode 214, and a reference terminal 143 connected to the voltage dividing node 113. Further, the voltage stabilizing element 14 is set with a reference potential, the voltage stabilizing element 14 compares the potential of the reference terminal 143 based on the reference potential, in this embodiment, the voltage stabilizing element 14 compares the divided potential based on the reference potential, and the voltage stabilizing element 14 has a first state that the control terminal 133 cannot obtain the current required for operation when the divided potential is smaller than the reference potential, and a second state that the control terminal 133 can obtain the current required for operation when the divided potential is greater than the reference potential. In one embodiment, the voltage regulator 14 is a voltage regulator transistor, the cathode of the voltage regulator transistor is the third connection 141, the anode of the voltage regulator transistor is the fourth connection 142, and the reference terminal of the voltage regulator transistor is the same as the reference terminal 143. Furthermore, in one embodiment, the regulator transistor may be implemented as TL431, and the reference voltage of the regulator transistor is 2.5V. In addition, in one embodiment, the output voltage regulator 100 has a fourth resistor 16 disposed between the voltage regulator component 14 and the switching component 13. In addition, in this embodiment, at least one of the first resistors 111 and 112 between the voltage dividing node 113 and the output cathode 214 has a smaller resistance than at least one of the first resistors 111 and 112 between the voltage dividing node 113 and the output anode 213. For example, as shown in fig. 2, the resistance of one of the first resistors 111 may be 2.6k ohms, and the resistance of the other of the first resistors 112 may be 2.5k ohms.
Referring to fig. 2 and 3 again, it should be understood that the output voltage stabilizing circuit 100 of the present invention receives the standby power 212 when the standby power supply module 21 is started, and that the output load 23 of the output voltage stabilizing circuit 100 of the present invention is not an output load 23 of the standby power supply module 21, and the output load 23 is at least one electronic device connected to the standby power supply module 21, and therefore, the output load 23 changes due to the number of the electronic devices connected to the standby power supply module 21, and the change of the output load 23 affects the voltage value of the standby power 212, specifically, when the resistance value of the output load 23 suddenly rises, the standby power supply module 21 still outputs the standby power 212 with the same power, and the voltage value of the standby power 212 is increased, as shown by the interval 30 in fig. 3. Then, referring to fig. 4, when the load of the standby power supply module 21 changes and the divided voltage level is greater than the reference voltage level due to the change of the standby power 212, the voltage stabilizing element 14 is in the second state, so that the switching element 13 is turned on and the second resistor 12 is used as one of the loads of the standby power supply module 21 to stabilize the standby power 212. On the contrary, when the load of the stock power supply module 21 does not change the stock power 212 enough to make the divided voltage potential greater than the reference potential, the voltage stabilizing element 14 is in the first state, turning off the switch element 13, and the second resistor 12 is not electrically connected to the output side 211 of the stock power supply module 21, as shown in fig. 5. In this way, the second resistor 12 is only incorporated into the load of the stock power supply module 21 (as indicated by the interval 40 in fig. 3) when the excess power is consumed, which not only can improve the power supply quality of the stock power supply module 21, but also can reduce the extra power loss, thereby improving the overall efficiency of the power supply 200.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. An output voltage stabilizing circuit is connected with an output side of a standby power supply module of a power supply, the standby power supply module is provided with an output anode and an output cathode on the output side, and the standby power supply module outputs standby power after being started, and is characterized in that the output voltage stabilizing circuit comprises:
the voltage division unit is respectively connected with the output anode and the output cathode and receives the standby power and consists of at least two first resistors which are arranged in series, a voltage division node is arranged between the first resistors and has a voltage division potential;
one end of the second resistor is connected with the output cathode;
a switch element, having a first connection end connected with the output anode, a second connection end connected with the second resistor, and a control end controlled to make the first connection end and the second connection end connected or cut off; and
a voltage stabilizing element, having a third connecting end connected with the control end, a fourth connecting end connected with the output cathode, and a reference end connected with the voltage dividing node to receive the divided voltage potential, wherein the voltage stabilizing element is set with a reference potential, and has a first state that the control end can not obtain the current required by work when the divided voltage potential is less than the reference potential, and a second state that the control end can obtain the current required by work when the divided voltage potential is greater than the reference potential;
when the load of the standby power supply module changes and the divided voltage potential is larger than the reference potential due to the standby power change, the switch element is turned on to enable the second resistor to serve as one load of the standby power supply module, so that the standby power is stabilized.
2. The output voltage regulator circuit of claim 1 wherein the voltage regulator component is a voltage regulator transistor.
3. The output voltage regulator circuit of claim 2, wherein at least one of the first resistors between the voltage divider node and the output cathode has a smaller resistance than at least one of the first resistors between the voltage divider node and the output anode.
4. The output voltage regulator circuit of claim 3 wherein the output voltage regulator circuit has a third resistor connected between the first connection terminal and the control terminal.
5. The output voltage regulator of claim 3 wherein the switch device is a BJT, the first terminal is an emitter of the BJT, the second terminal is a collector of the BJT, and the control terminal is a base of the BJT.
6. The output voltage regulator circuit of claim 3 wherein the regulated output circuit has a fourth resistor disposed between the voltage regulator component and the switching component.
7. The output voltage regulator circuit of claim 1 or 2, wherein the output voltage regulator circuit has a third resistor connected between the first connection terminal and the control terminal.
8. The output voltage regulator circuit of claim 7 wherein the switch device is a BJT, the first terminal is an emitter of the BJT, the second terminal is a collector of the BJT, and the control terminal is a base of the BJT.
9. The output voltage regulator circuit according to claim 1 or 2, wherein the switch device is a bjt, the first terminal is an emitter of the bjt, the second terminal is a collector of the bjt, and the control terminal is a base of the bjt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910934313.7A CN112578834A (en) | 2019-09-29 | 2019-09-29 | Output voltage stabilizing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910934313.7A CN112578834A (en) | 2019-09-29 | 2019-09-29 | Output voltage stabilizing circuit |
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| Publication Number | Publication Date |
|---|---|
| CN112578834A true CN112578834A (en) | 2021-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910934313.7A Pending CN112578834A (en) | 2019-09-29 | 2019-09-29 | Output voltage stabilizing circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201213222Y (en) * | 2008-06-10 | 2009-03-25 | 中兴通讯股份有限公司 | Rear stage working circuit protecting device for dual path electric power supplying system |
| TW201524084A (en) * | 2013-12-10 | 2015-06-16 | Zippy Tech Corp | Redundant power system for improving standby power consumption |
| CN206894499U (en) * | 2017-06-14 | 2018-01-16 | 海韵电子工业股份有限公司 | Power supply unit |
| CN108258904A (en) * | 2017-12-01 | 2018-07-06 | 珠海格力电器股份有限公司 | DC power supply and its method of supplying power to |
| US20190173376A1 (en) * | 2017-12-01 | 2019-06-06 | Commissariat à I'Energie Atomique et aux Energies Alternatives | Circuit for charging an electric battery by means of a photovoltaic module |
-
2019
- 2019-09-29 CN CN201910934313.7A patent/CN112578834A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201213222Y (en) * | 2008-06-10 | 2009-03-25 | 中兴通讯股份有限公司 | Rear stage working circuit protecting device for dual path electric power supplying system |
| TW201524084A (en) * | 2013-12-10 | 2015-06-16 | Zippy Tech Corp | Redundant power system for improving standby power consumption |
| CN206894499U (en) * | 2017-06-14 | 2018-01-16 | 海韵电子工业股份有限公司 | Power supply unit |
| CN108258904A (en) * | 2017-12-01 | 2018-07-06 | 珠海格力电器股份有限公司 | DC power supply and its method of supplying power to |
| US20190173376A1 (en) * | 2017-12-01 | 2019-06-06 | Commissariat à I'Energie Atomique et aux Energies Alternatives | Circuit for charging an electric battery by means of a photovoltaic module |
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