CN210721185U - Second-order voltage stabilizing circuit based on load size - Google Patents
Second-order voltage stabilizing circuit based on load size Download PDFInfo
- Publication number
- CN210721185U CN210721185U CN201921142367.1U CN201921142367U CN210721185U CN 210721185 U CN210721185 U CN 210721185U CN 201921142367 U CN201921142367 U CN 201921142367U CN 210721185 U CN210721185 U CN 210721185U
- Authority
- CN
- China
- Prior art keywords
- voltage
- load
- resistor
- power supply
- voltage stabilizing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model relates to the technical field of voltage stabilizing circuits, in particular to a second-order voltage stabilizing circuit based on load size, which comprises a load; a first power supply terminal for supplying a high voltage; the input end of the mutual inductance control unit is connected with a load; the input end of the switch control unit is connected with the output end of the mutual inductance control unit; the reference end of the voltage stabilizing unit is connected with the first power supply end, and the input end of the voltage stabilizing unit is connected with the output end of the switch control unit; the input end of the photoelectric coupling unit is connected with the output end of the voltage stabilizing unit, and the output end of the photoelectric coupling unit is connected with the feedback end of the chip. The beneficial effects of the above technical scheme are that: the current of the output load is adopted through the mutual inductor, so that the no-load voltage stabilization is low, the power consumption is low, and the efficiency is high; the load voltage is stable, the load capacity is strong, the efficiency is high, the power consumption and the efficiency are dual stable when the product is in no-load and load states, and the stability of the product is improved.
Description
Technical Field
The utility model relates to a voltage stabilizing circuit technical field especially relates to a second order voltage stabilizing circuit based on load size.
Background
With the development of science and technology, electronic devices in various application scenes have gradually and rapidly entered the lives of people, and in order to meet the voltage requirements of various scenes, a precision reference voltage stabilizing source is also generated.
At present, in a common inverter, in order to guarantee and limit a direct-current high-voltage threshold value after post-stage rectification, the power device in a circuit is prevented from being damaged due to overhigh voltage. It is common practice to create a regulated voltage source from a reference source to limit the dc high voltage below a safe voltage. For example, in comparison with a conventional TL431 regulator, as shown in fig. 1 and fig. 2, the voltage value of Vout is stabilized by adjusting the resistance values of R1 and R2. When Vout rises, the sampling voltage Uref also rises along with the rising of Vout, so that Vout is larger than Vref, the comparator outputs high level, the transistor is conducted, and Vout falls; conversely, when Vout drops, the sampling voltage Uref also drops, so that Vout < Vref, the comparator turns over again, outputting a low level, turning on and off the transistor, and finally, raising Vout. The process is circulated in such a way, so that the dynamic leveling is achieved, the Vout is forced to be stable, and the purpose of stabilizing the voltage is achieved.
However, in most circuits the threshold of the regulated voltage is fixed, defining an upper voltage limit. However, in a common inverter, voltage thresholds actually required are different corresponding to different load sizes, and under the condition of no-load or light load, the voltage threshold is limited too high, which causes the problem that the duty ratio is adjusted too much, and the power consumption, efficiency and temperature rise of a product are affected, and the problem that no-load voltage stabilization and product stability become urgent needs to be solved in the field.
Disclosure of Invention
In view of the above problems in the prior art, a two-stage voltage regulator circuit based on load size is provided.
The specific technical scheme is as follows:
a second order voltage regulator circuit based on load size, comprising:
a load;
a first power supply terminal, said first power supply terminal providing a high voltage;
the input end of the mutual inductance control unit is connected with the load;
the input end of the switch control unit is connected with the output end of the mutual inductance control unit;
the reference end of the voltage stabilizing unit is connected with the first power supply end, and the input end of the voltage stabilizing unit is connected with the output end of the switch control unit;
the input end of the photoelectric coupling unit is connected with the output end of the voltage stabilizing unit, and the output end of the photoelectric coupling unit is connected with the feedback end of a chip.
Preferably, the mutual inductance control unit includes:
the first interface of the primary coil of the mutual inductor is connected with the load, and the second interface of the primary coil of the mutual inductor is connected with the ground end through a first capacitor; a third interface of a secondary coil of the mutual inductor is connected with the output end of the mutual inductance control unit; the second interface of the secondary coil is connected with the grounding end;
the input end of the switch diode group is connected with the output end of the switch control unit; the output end of the switch diode group is connected with a grounding end;
and the first resistor is connected between the input end of the switch diode group and the grounding end.
Preferably, the switch control unit includes:
a first triode whose emitter is connected to the output of the switch diode group via a second resistor and a third resistorGo outA terminal;
the fourth resistor is connected between the collector of the first triode and the grounding end;
the second capacitor is connected between the base electrode of the first triode and the grounding end;
the third capacitor is connected between the collector of the first triode and the ground terminal;
and the fifth resistor is connected between the collector of the first triode and the voltage stabilizing unit.
Preferably, the voltage stabilization unit includes:
the anode of the controllable voltage-stabilizing source is connected with a grounding terminal; the reference end of the controllable voltage-stabilizing source is connected with the first power supply end through a sixth resistor; the cathode of the controllable voltage-stabilizing source is connected with a second power supply end through a seventh resistor;
and the fourth capacitor is connected between the reference end of the controllable voltage-stabilizing source and the cathode of the controllable voltage-stabilizing source.
Preferably, the voltage stabilizing unit further includes:
the input end of the voltage stabilizing diode is connected with the cathode of the controllable voltage stabilizing source; and the output end of the voltage stabilizing diode is connected with the photoelectric coupling unit through an eighth resistor.
Preferably, the photo coupling unit includes:
a photocoupler, said photocoupler comprising:
the input end of the light-emitting diode is connected with the second power supply end; the output end of the light-emitting diode is connected with the output end of the voltage stabilizing diode through the eighth resistor;
the input end of the second triode is connected with a third power supply end; and the output end of the second triode is connected with the grounding end through a fifth capacitor.
Preferably, the switching diode group includes at least four zener diodes.
Preferably, the voltage of the first power supply terminal is 360V; the voltage of the second power supply end is 15V; the voltage of the third power supply end is 12V.
The beneficial effects of the above technical scheme are that: the current of the output load is adopted through the mutual inductor, so that the no-load voltage stabilization is low, the power consumption is low, and the efficiency is high; the load voltage is stable, the load capacity is strong, the efficiency is high, the power consumption and the efficiency are dual stable when the product is in no-load and load states, and the stability of the product is improved.
Drawings
FIGS. 1 and 2 are circuit diagrams of two different connections of a TL431 voltage regulator, respectively, of the prior art;
FIG. 3 is a circuit diagram of an embodiment of the present invention of a second order voltage stabilizing circuit based on load size;
a load 1; a first power supply terminal 2; a second power source terminal 21; a third power supply terminal 22; a mutual inductance control unit 3; a transformer 31; a switching diode group 32; a switch control unit 4; a first transistor 41; a voltage stabilization unit 5; a controllable regulated voltage source 51; a zener diode 52; a photoelectric coupling unit 6; a photocoupler 61; a light emitting diode 62; a second triode 63; and a chip 7.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.
In the prior art, when an inverter is in a no-load or light-load state, the threshold value of a voltage stabilizing circuit is too high, and the power consumption, the efficiency and the temperature rise of a product are influenced. Aiming at the problems in the prior art, the technical scheme is provided, and the voltage stabilizing threshold of the voltage stabilizing circuit can be automatically adjusted according to the load. And the load size state is transmitted to the front-stage chip through the optical coupler. The specific technical scheme is as follows:
a second order voltage regulator circuit based on load size, comprising:
a load 1;
a first power source terminal 2, the first power source terminal 2 providing a high voltage;
the input end of the mutual inductance control unit 3 is connected with the load 1;
the input end of the switch control unit 4 is connected with the output end of the mutual inductance control unit 3;
the reference end of the voltage stabilizing unit 5 is connected with the first power supply end 2, and the input end of the voltage stabilizing unit 5 is connected with the output end of the switch control unit 4;
and the input end of the photoelectric coupling unit 6 is connected with the output end of the voltage stabilizing unit 5, and the output end of the photoelectric coupling unit 6 is connected with the feedback end of a chip 7.
Specifically, as shown in fig. 3, in the present technical solution, in a no-load or light-load state, the threshold of the voltage stabilizing circuit is properly reduced through the mutual inductance control unit 3, the switch control unit 4 and the voltage stabilizing unit 5, when a load is large, the threshold of the voltage stabilizing circuit is increased, the duty ratio is increased, and the overall load carrying capability of the transformer is improved, so that both the efficiency and the load carrying capability can be ensured under different loads; the output end of the photoelectric coupling unit 6 is connected with the feedback end of the chip 7.
In a preferred embodiment, the mutual inductance control unit 3 includes:
the transformer 31, a first interface of a primary coil of the transformer 31 is connected with the load 1, and a second interface of the primary coil is connected to the ground end through a first capacitor C1; a third interface of a secondary coil 31 of the mutual inductor is connected with the output end of the mutual inductance control unit 3; the second interface of the secondary coil is connected with the grounding end;
a switch diode group 32, the input end of the switch diode group 32 is connected with the output end of the switch control unit 4; the output terminal of the switching diode group 32 is connected to the ground terminal;
a first resistor R1, the first resistor R1 is connected between the input terminal of the switching diode group 32 and the ground terminal.
Specifically, as shown in fig. 2, in practical application, the type of the transformer 31 is 1500T, and the sampling circuit of the transformer 31 may be replaced by another current sampling scheme such as a current circuit like a constantan wire sampling circuit; the first resistor R1 is 1K/0.25W.
In a preferred embodiment, the switch control unit 4 comprises:
a first transistor 41, an emitter of the first transistor 41 is connected to the output of the switching diode set 32 through a second resistor R2 and a third resistor R3Go outA terminal;
a fourth resistor R4, the fourth resistor R4 is connected between the collector of the first transistor 41 and the ground;
a second capacitor C2, the second capacitor C2 is connected between the base of the first transistor 41 and the ground;
a third capacitor C3, the third capacitor C3 is connected between the collector of the transistor 41 and the ground;
a fifth resistor R5, the fifth resistor R5 is connected between the collector of the first transistor 41 and the voltage regulator unit 5.
Specifically, in the present technical solution, the voltage-dividing resistance of the base of the first triode 41 is changed, and the voltage-stabilizing value of the voltage-stabilizing circuit is changed to correspondingly change the size of the corresponding load;
further, when no load or light load is output, the output value of the transformer 31 is relatively small, the voltage drop across the first resistor R1 is relatively small, the voltage value after voltage division by the third resistor R3 and the second resistor R2 is relatively small, the starting threshold of the first triode 41 cannot be reached, the voltage division resistance of the base of the first triode 41 is reduced, the threshold is reduced, the duty ratio is reduced, and the overall load capacity of the transformer circuit is reduced.
Further, the second resistor R2 is 10K, the third resistor R3 is 2K, the fourth resistor R4 is 1.5K, the second capacitor C2 is 104/63V, and the fifth resistor R5 is 5.8K.
In a preferred embodiment, the voltage stabilization unit 5 comprises:
a controllable voltage-stabilizing source 51, wherein the anode of the controllable voltage-stabilizing source 51 is connected with the grounding terminal; the reference terminal of the controllable voltage regulator 51 is connected with the first power supply terminal 2 through a sixth resistor R6; the cathode of the controllable voltage regulator 51 is connected with a second power supply end 21 through a seventh resistor R7;
a fourth capacitor C4, the fourth capacitor C4 is connected between the reference terminal of the controllable regulator 51 and the cathode of the controllable regulator 51;
specifically, in the present embodiment, the controllable regulator 51 may use various voltage stabilizing circuits, for example, a TL431 voltage stabilizing circuit, or a voltage stabilizing circuit composed of voltage stabilizing chips such as an MC34063 in practical use.
Further, the sixth resistor R6 is 1M/1/4W/1%, and the seventh resistor R7 is 4.7K.
In a preferred embodiment, the voltage regulation unit 5 further comprises:
a voltage stabilizing diode 52, wherein the input end of the voltage stabilizing diode 52 is connected with the cathode of the controllable voltage stabilizing source 51; the output of the zener diode 52 is connected to the optocoupler unit 6 via an eighth resistor R8.
Specifically, when no load or light load is output, the output value of the transformer 31 is relatively small, the voltage drop across the first resistor R1 is relatively small, and the voltage value after voltage division through the third resistor R3 and the second resistor R2 is relatively small, so that the voltage value cannot reach the turn-on threshold of the first triode 41. At this time, the peripheral voltage stabilizing resistor of the controllable voltage regulator 51 comprises a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, the voltage stabilizing value is relatively small, when the direct-current high voltage provided by the first power supply end 2 is higher than the voltage stabilizing value, the anode and the cathode of the controllable voltage regulator 51 are conducted, the cathode is equivalently grounded, the photoelectric coupler 61 is conducted at this time, the output pipe of the photoelectric coupler 61 is high, the front-stage duty ratio is reduced, and the voltage of the first power supply end 2 is reduced. Until the voltage of the first power supply terminal 2 is stabilized at the threshold of the voltage stabilizing circuit. Because the set voltage stabilizing value is smaller, the value of the front-stage duty ratio is smaller, the integrally required energy is smaller, and the integral power consumption and efficiency are improved.
When the output load 1 is increased and the load 1 is increased to a certain degree, the divided voltage values of the second resistor R2 and the third resistor R3 are increased to reach the threshold of the conducting voltage of the first triode 41; at this time, the first transistor 41 is turned on, and the fourth resistor R4 is short-circuited to ground. At this time, the peripheral resistor of the controllable voltage regulator 51 is composed of a fifth resistor R5 and a sixth resistor R6, and the voltage regulation threshold value is higher. When the first power supply end 2 provides a direct current high voltage which is lower than the regulated voltage value, the anode and the cathode of the controllable voltage regulator 51 are not conducted, at the moment, the photoelectric coupler 61 does not work, the output end of the photoelectric coupler 61 is arranged low, the duty ratio of the front stage is increased, and the first power supply end 2 provides a direct current high voltage value which is increased. Finally, the first power supply end 2 provides direct current high voltage to be stabilized at a voltage stabilizing value set by the voltage stabilizing circuit. At the moment, the duty ratio of the front stage is larger, the load capacity is stronger, and the first power supply end 2 supplies direct-current high voltage more stably.
In the circuit, the values of the second resistor R2 and the third resistor R3 can be changed, so that the voltage stabilizing circuit can change the corresponding load 1 value (current value) according to the threshold value. If the load 1 value is required to be larger, the voltage stabilizing point is increased, the value of the third resistor R3 is increased or the second resistor R2 is reduced; otherwise, the opposite is true.
In a preferred embodiment, the photocoupling unit 6 includes:
a photocoupler 61, the photocoupler 61 comprising:
a light emitting diode 62, wherein the input end of the light emitting diode 62 is connected with the second power supply end 21; the output end of the light emitting diode 62 is connected with the output end of the zener diode 52 through an eighth resistor R8;
a second triode 63, wherein the input end of the second triode 63 is connected with a third power supply end 22; the output terminal of the second transistor 63 is connected to the ground terminal through a fifth capacitor C5.
Specifically, as shown in fig. 3, the photocoupling unit 6 is an electric-to-optical-to-electric conversion device that transmits an electric signal through the medium of light. The light emitting diode 62 and the second triode 63 are assembled in the same sealed shell and are isolated from each other by a transparent insulator;
furthermore, the photoelectric coupling unit 6 has the advantages of isolating the input circuit and the output circuit of the photoelectric coupling unit 6 from each other, having unidirectionality when transmitting electric signals, and the like, so that the photoelectric coupling unit 6 has good electromagnetic interference resistance and electrical insulation capability.
In a preferred embodiment, the switching diode bank 32 includes at least four zener diodes.
In a preferred embodiment, the voltage of the first supply terminal 2 is 360V; the voltage of the second power source terminal 21 is 15V; the voltage of the third power source terminal 22 is 12V.
The beneficial effects of the above technical scheme are that: the current of the output load is adopted through the mutual inductor, so that the no-load voltage stabilization is low, the power consumption is low, and the efficiency is high; the load voltage is stable, the load capacity is strong, the efficiency is high, the power consumption and the efficiency are dual stable when the product is in no-load and load states, and the stability of the product is improved.
The above description is only an example of the preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and those skilled in the art should be able to realize the equivalent alternatives and obvious variations of the present invention.
Claims (8)
1. A second order voltage stabilizing circuit based on load size, the second order voltage stabilizing circuit comprising:
a load;
a first power supply terminal, said first power supply terminal providing a high voltage;
the input end of the mutual inductance control unit is connected with the load;
the input end of the switch control unit is connected with the output end of the mutual inductance control unit;
the reference end of the voltage stabilizing unit is connected with the first power supply end, and the input end of the voltage stabilizing unit is connected with the output end of the switch control unit;
the input end of the photoelectric coupling unit is connected with the output end of the voltage stabilizing unit, and the output end of the photoelectric coupling unit is connected with the feedback end of a chip.
2. The second order voltage regulator circuit according to claim 1, wherein the mutual inductance control unit comprises:
the first interface of the primary coil of the mutual inductor is connected with the load, and the second interface of the primary coil of the mutual inductor is connected with the ground end through a first capacitor; a third interface of a secondary coil of the mutual inductor is connected with the output end of the mutual inductance control unit; the second interface of the secondary coil is connected with the grounding end;
the input end of the switch diode group is connected with the output end of the switch control unit; the output end of the switch diode group is connected with a grounding end;
and the first resistor is connected between the input end of the switch diode group and the grounding end.
3. The second order voltage regulator circuit according to claim 2, wherein the switch control unit comprises:
the emitter of the first triode is connected with the output end of the switch diode group through a second resistor and a third resistor;
the fourth resistor is connected between the collector of the first triode and the grounding end;
the second capacitor is connected between the base electrode of the first triode and the grounding end;
the third capacitor is connected between the collector of the first triode and the ground terminal;
and the fifth resistor is connected between the collector of the first triode and the voltage stabilizing unit.
4. The second order voltage regulator circuit according to claim 1, wherein the voltage regulator unit comprises:
the anode of the controllable voltage-stabilizing source is connected with a grounding terminal;
the reference end of the controllable voltage-stabilizing source is connected with the first power supply end through a sixth resistor;
the cathode of the controllable voltage-stabilizing source is connected with a second power supply end through a seventh resistor;
and the fourth capacitor is connected between the reference end of the controllable voltage-stabilizing source and the cathode of the controllable voltage-stabilizing source.
5. The second order voltage regulator circuit according to claim 4, wherein the voltage regulator unit further comprises:
the input end of the voltage stabilizing diode is connected with the cathode of the controllable voltage stabilizing source;
and the output end of the voltage stabilizing diode is connected with the photoelectric coupling unit through an eighth resistor.
6. The second order voltage regulator circuit according to claim 5, wherein the photo coupling unit comprises:
a photocoupler, said photocoupler comprising:
the input end of the light-emitting diode is connected with the second power supply end;
the output end of the light-emitting diode is connected with the output end of the voltage stabilizing diode through the eighth resistor;
the input end of the second triode is connected with a third power supply end;
and the output end of the second triode is connected with the grounding end through a fifth capacitor.
7. The second order voltage regulator circuit according to claim 2, wherein said switching diode bank comprises at least four zener diodes.
8. The second order voltage regulator circuit according to claim 6, wherein the voltage of the first power supply terminal is 360V; the voltage of the second power supply end is 15V; the voltage of the third power supply end is 12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921142367.1U CN210721185U (en) | 2019-07-19 | 2019-07-19 | Second-order voltage stabilizing circuit based on load size |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921142367.1U CN210721185U (en) | 2019-07-19 | 2019-07-19 | Second-order voltage stabilizing circuit based on load size |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210721185U true CN210721185U (en) | 2020-06-09 |
Family
ID=70933210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921142367.1U Active CN210721185U (en) | 2019-07-19 | 2019-07-19 | Second-order voltage stabilizing circuit based on load size |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210721185U (en) |
-
2019
- 2019-07-19 CN CN201921142367.1U patent/CN210721185U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102255489B (en) | High-voltage start-up circuit for switching power supply converter | |
| CN105391192A (en) | Electric energy transmitting terminal and wireless charging device | |
| CN111432523A (en) | BUCK constant current control circuit with input voltage changing along with output voltage and power supply | |
| CN210721185U (en) | Second-order voltage stabilizing circuit based on load size | |
| CN107332435B (en) | Power supply circuit of pulse width modulation chip and switching power supply | |
| CN212210576U (en) | Power supply circuit of low-power-consumption storage battery charger | |
| CN101752829B (en) | Undervoltage protection circuit and switching power supply | |
| CN205490213U (en) | Switching power supply of electric energy meter | |
| CN210273531U (en) | Charging circuit, charging equipment and terminal | |
| CN104684177B (en) | optical coupler feedback full-voltage LED drive circuit and LED lighting equipment | |
| CN211046770U (en) | Power supply circuit and electronic equipment | |
| CN110601323B (en) | Charging device and driving power supply generating circuit | |
| CN201868933U (en) | A primary-side feedback constant-voltage current-limiting RCC charger control circuit | |
| CN213938392U (en) | Single live wire power-taking circuit | |
| CN219918726U (en) | Switching power supply circuit, switching power supply and electric equipment | |
| CN215185998U (en) | Charging circuit based on boost framework | |
| CN210183079U (en) | Driving circuit of micro-power charger | |
| CN212343649U (en) | Boost circuit and short-circuit protection circuit and LED drive circuit thereof | |
| CN215378777U (en) | Switching power supply circuit and switching power supply system using same | |
| CN218335404U (en) | Power supply circuit, auxiliary power supply circuit and electronic equipment | |
| CN219304707U (en) | Output regulating circuit | |
| CN215186489U (en) | Switching power supply circuit and multi-stage output switching power supply | |
| CN216672861U (en) | Novel four-way self-adjusting output flyback switching power supply | |
| CN214480253U (en) | Isolation driving circuit | |
| CN217116058U (en) | Control circuit and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |