CN211264194U - Hysteresis constant voltage power supply circuit and hysteresis constant voltage power supply - Google Patents
Hysteresis constant voltage power supply circuit and hysteresis constant voltage power supply Download PDFInfo
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- CN211264194U CN211264194U CN202020007517.4U CN202020007517U CN211264194U CN 211264194 U CN211264194 U CN 211264194U CN 202020007517 U CN202020007517 U CN 202020007517U CN 211264194 U CN211264194 U CN 211264194U
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Abstract
The utility model relates to a hysteresis constant voltage power supply circuit and hysteresis constant voltage power supply, through setting up starting switch unit, first current-limiting resistor, hysteresis voltage control unit, second current-limiting resistor and output switch unit, the first end of starting switch unit is used for external input power supply voltage and is connected with the first end of output switch unit, the second end of starting switch unit is connected with the first end of hysteresis voltage control unit through first current-limiting resistor, the third end of starting switch unit is connected with one end of second current-limiting resistor, the other end of second current-limiting resistor is connected with the second end of hysteresis voltage control unit and the second end of output switch unit respectively, the third end of hysteresis voltage control unit is grounded, the third end of output switch unit is used for exporting invariable target voltage, the structure of hysteresis constant voltage power supply circuit has been simplified to above-mentioned hysteresis constant voltage power supply circuit, the power supply quality of the power utilization circuit is improved.
Description
Technical Field
The utility model relates to a power supply circuit field especially relates to a hysteresis loop constant voltage power supply circuit and hysteresis loop constant voltage power supply.
Background
At present, a comparison circuit, a logic circuit and a control circuit are usually arranged in the traditional hysteresis control, the control circuit and the logic circuit are often required to be powered, and the overall structure of the circuit is often complex and tedious.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a hysteresis constant voltage power supply circuit and hysteresis constant voltage power supply, hysteresis constant voltage power supply circuit passes through the mutual cooperation of start switch unit, first current-limiting resistance, hysteresis voltage control unit, second current-limiting resistance and output switch unit, when reaching first preset voltage threshold value in the power input voltage climbing process, constant voltage power supply circuit immediately starts to output invariable target voltage; when the input voltage of the power supply is lower than the second preset voltage threshold value in the process of falling, the constant voltage power supply circuit immediately cuts off the output, a comparison circuit and a logic circuit are not needed, and power supply for a control circuit is not needed independently, so that the structure of the hysteresis constant voltage power supply circuit is simplified, and the constant target voltage is output to improve the power supply quality of the power circuit.
A hysteresis constant voltage power supply circuit includes: the starting switch unit, the first current-limiting resistor, the hysteresis voltage control unit, the second current-limiting resistor and the output switch unit;
the first end of the starting switch unit is used for externally connecting an input power supply voltage and is connected with the first end of the output switch unit, the second end of the starting switch unit is connected with the first end of the hysteresis voltage control unit through a first current-limiting resistor, and the third end of the starting switch unit is connected with one end of a second current-limiting resistor;
the other end of the second current-limiting resistor is respectively connected with the second end of the hysteresis voltage control unit and the second end of the output switch unit, the third end of the hysteresis voltage control unit is grounded, and the third end of the output switch unit is used for outputting a constant target voltage;
the hysteresis voltage control unit is used for controlling the starting switch unit and the output switch unit to be conducted when the voltage of the input power supply rises to a first preset voltage threshold value, so that the output switch unit outputs a constant target voltage;
the hysteresis voltage control unit is further used for controlling the starting switch unit and the output switch unit to be switched off when the voltage of the input power supply is reduced to a second preset voltage threshold value, and the second preset voltage threshold value is smaller than the first preset voltage threshold value.
In one embodiment, the hysteresis voltage control unit includes a first voltage stabilization unit, a second voltage stabilization unit, and a hysteresis control switch;
one end of the first voltage stabilizing unit is respectively connected with one end of the first current limiting resistor and the first end of the hysteresis control switch, the other end of the first voltage stabilizing unit is grounded, the second end of the hysteresis control switch is respectively connected with one end of the second current limiting resistor and the second end of the output switch unit, one end of the second voltage stabilizing unit is connected with the third end of the hysteresis control switch, and the other end of the second voltage stabilizing unit is grounded;
the first voltage stabilizing value corresponding to the first voltage stabilizing unit is greater than the second voltage stabilizing value corresponding to the second voltage stabilizing unit, the first voltage stabilizing value is smaller than a first preset voltage threshold value, and the second voltage stabilizing value is smaller than a second preset voltage threshold value.
In one embodiment, the first voltage stabilizing unit adopts a first voltage stabilizing diode, the cathode of the first voltage stabilizing diode is connected with one end of a first current limiting resistor and the first end of the hysteresis control switch, and the anode of the first voltage stabilizing diode is grounded.
In one embodiment, the second voltage stabilizing unit adopts a second voltage stabilizing diode, the cathode of the second voltage stabilizing diode is connected with the third end of the hysteresis control switch, and the anode of the second voltage stabilizing diode is grounded.
In one embodiment, the hysteresis control switch adopts a triode or a MOS tube.
In one embodiment, the hysteresis control switch is an NPN triode, a collector of the NPN triode is a first end of the hysteresis control switch, a base of the NPN triode is a second end of the hysteresis control switch, and an emitter of the NPN triode is a third end of the hysteresis control switch.
In one embodiment, the hysteresis constant voltage power supply circuit further includes an anti-reverse connection unit, one end of the anti-reverse connection unit is used for being connected with the input power supply voltage, and the other end of the anti-reverse connection unit is respectively connected with the first end of the start switch unit and the first end of the output switch unit.
In one embodiment, the reverse connection preventing unit employs a diode.
In one embodiment, the starting switch unit adopts a triode or an MOS tube, and the output switch unit adopts a triode or an MOS tube.
In one embodiment, the start switch unit is a PNP triode, an emitter of the PNP triode is a first terminal of the start switch unit, a base of the PNP triode is a second terminal of the start switch unit, and a collector of the PNP triode is a third terminal of the start switch unit.
In one embodiment, a hysteresis constant voltage power supply is also provided, which adopts the hysteresis constant voltage power supply circuit.
The hysteresis constant voltage power supply circuit is characterized in that a starting switch unit, a first current-limiting resistor, a hysteresis voltage control unit, a second current-limiting resistor and an output switch unit are arranged, a first end of the starting switch unit is used for being externally connected with an input power supply voltage and is connected with a first end of the output switch unit, a second end of the starting switch unit is connected with a first end of the hysteresis voltage control unit through the first current-limiting resistor, a third end of the starting switch unit is connected with one end of the second current-limiting resistor, the other end of the second current-limiting resistor is respectively connected with a second end of the hysteresis voltage control unit and a second end of the output switch unit, a third end of the hysteresis voltage control unit is grounded, a third end of the output switch unit is used for outputting constant target voltage, and the hysteresis voltage control unit is used for controlling the starting switch unit and the output switch unit to be conducted when the input power supply voltage rises to a first, the hysteresis voltage control unit is also used for controlling the starting switch unit and the output switch unit to be switched off when the voltage of the input power supply is reduced to a second preset voltage threshold value, the second preset voltage threshold value is smaller than the first preset voltage threshold value, and further starting to output the constant target voltage immediately when the voltage of the input voltage of the power supply reaches the first preset voltage threshold value in the climbing process through the mutual matching of the starting switch unit, the first current-limiting resistor, the hysteresis voltage control unit, the second current-limiting resistor and the output switch unit; when the input voltage of the power supply is lower than the second preset voltage threshold value in the process of falling, the output is immediately cut off, and the hysteresis constant voltage power supply circuit does not need to use a comparison circuit and a logic circuit and independently supply power to a control circuit, so that the structure of the hysteresis constant voltage power supply circuit is simplified, and the power supply quality of a power circuit is improved.
Drawings
In order to illustrate the technical solution of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
FIG. 1 is a block diagram of a hysteresis constant voltage power supply circuit according to an embodiment;
fig. 2 is a schematic diagram of a hysteresis constant voltage power supply circuit according to an embodiment.
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.
The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
Various embodiments of the present disclosure will be described more fully hereinafter. The present disclosure is capable of various embodiments and of modifications and variations therein. However, it should be understood that: there is no intention to limit the various embodiments of the disclosure to the specific embodiments disclosed herein, but rather, the disclosure is to cover all modifications, equivalents, and/or alternatives falling within the spirit and scope of the various embodiments of the disclosure.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
Fig. 1 is a block diagram of a hysteresis constant voltage power supply circuit 100 provided in an embodiment, where the hysteresis constant voltage power supply circuit 100 includes: the starting switch unit 110, the first current limiting resistor R1, the hysteresis voltage control unit 120, the second current limiting resistor R2 and the output switch unit 130;
the first end 11 of the start switch unit 110 is used for externally inputting a power voltage and is connected to the first end 31 of the output switch unit 130, the second end 12 of the start switch unit 110 is connected to the first end 21 of the hysteresis voltage control unit 120 through a first current-limiting resistor R1, and the third end 13 of the start switch unit 110 is connected to one end of a second current-limiting resistor R2;
the other end of the second current-limiting resistor R2 is connected to the second end 22 of the hysteresis voltage control unit 120 and the second end 32 of the output switch unit 130, respectively, the third end 31 of the hysteresis voltage control unit 120 is grounded, and the third end 33 of the output switch unit 130 is used for outputting a constant target voltage;
the hysteresis voltage control unit 120 is configured to control the start switch unit 110 and the output switch unit 130 to be turned on when the input power voltage rises to a first preset voltage threshold, so that the output switch unit 130 outputs a constant target voltage;
the hysteresis voltage control unit 120 is further configured to control the start switch unit 110 and the output switch unit 130 to turn off when the input power voltage drops to a second preset voltage threshold, where the second preset voltage threshold is smaller than the first preset voltage threshold.
The hysteresis voltage power supply circuit 100 starts to output a constant target voltage immediately when the input voltage of the power supply reaches a first preset voltage threshold value in the climbing process through the mutual cooperation of the starting switch unit 110, the first current-limiting resistor R1, the hysteresis voltage control unit 120, the second current-limiting resistor R2 and the output switch unit 130; when the input voltage of the power supply is lower than the second preset voltage threshold value in the process of reducing the input voltage, the output is immediately cut off, the structure of the hysteresis constant voltage power supply circuit is simplified by the hysteresis constant voltage power supply circuit 100, power does not need to be supplied to a control circuit independently, and the power quality of a power circuit is improved.
In one embodiment, as shown in fig. 2, the hysteresis voltage control unit 120 includes a first voltage regulation unit 122, a second voltage regulation unit 124, and a hysteresis control switch 126;
one end of the first voltage stabilizing unit 122 is connected to one end of the first current limiting resistor R1 and the first end of the hysteresis control switch 126, respectively, the other end of the first voltage stabilizing unit 122 is grounded, the second end of the hysteresis control switch 126 is connected to one end of the second current limiting resistor R2 and the second end 32 of the output switch unit 130, one end of the second voltage stabilizing unit 124 is connected to the third end of the hysteresis control switch 126, and the other end of the second voltage stabilizing unit 124 is grounded;
the first voltage regulation value corresponding to the first voltage regulation unit 122 is greater than the second voltage regulation value corresponding to the second voltage regulation unit 124, the first voltage regulation value is smaller than the first preset voltage threshold, and the second voltage regulation value is smaller than the second preset voltage threshold.
In one embodiment, as shown in fig. 2, the first voltage regulator unit 122 employs a first voltage regulator diode, a cathode of the first voltage regulator diode is connected to one end of the first current limiting resistor R1 and a first end of the hysteresis control switch 126, and an anode of the first voltage regulator diode is grounded.
In one embodiment, as shown in fig. 2, the second voltage regulation unit 124 employs a second zener diode, a cathode of the second zener diode is connected to the third terminal of the hysteresis control switch 126, and an anode of the second zener diode is grounded.
In one embodiment, the hysteresis control switch 126 is implemented as a transistor or a MOS transistor.
In one embodiment, as shown in fig. 2, the hysteresis control switch 126 is an NPN transistor, a collector c of the NPN transistor is a first terminal of the hysteresis control switch 126, a base b of the NPN transistor is a second terminal of the hysteresis control switch 126, and an emitter e of the NPN transistor is a third terminal of the hysteresis control switch 126.
In one embodiment, as shown in fig. 2, the hysteresis constant voltage power supply circuit 200 further includes an anti-reverse connection unit 140, one end of the anti-reverse connection unit 140 is used for connecting with the input power voltage, and the other end of the anti-reverse connection unit 140 is respectively connected with the first end 11 of the start switch unit 110 and the first end 31 of the output switch unit 130.
In one embodiment, as shown in fig. 2, the reverse connection preventing unit 140 employs a diode.
Through the reverse connection preventing unit 140, when the input power supply voltage is connected reversely, the circuit is not conducted, the circuit device is not damaged, and the safety of the circuit is improved.
In one embodiment, the start switch unit 110 employs a transistor or a MOS transistor.
In one embodiment, the output switching unit 130 employs a transistor or a MOS transistor, wherein the transistor or the MOS transistor operates in an amplifying state.
In one embodiment, the output switching unit 130 employs an NPN transistor.
In one embodiment, as shown in fig. 2, the start switch unit 110 is a PNP transistor, an emitter of the PNP transistor is the first terminal 11 of the start switch unit 110, a base of the PNP transistor is the second terminal 12 of the start switch unit 110, and a collector of the PNP transistor is the third terminal 13 of the start switch unit 110.
In one embodiment, a hysteresis constant voltage power supply is also provided, which adopts the hysteresis constant voltage power supply circuit.
The working process of the circuit is illustrated by taking the hysteresis constant voltage power supply circuit 200 shown in fig. 2 as an example, for convenience of analysis, the conduction voltage drop of each switching tube is ignored, when the device starts to be powered on, the Vin voltage starts to rise from 0, when the Vin voltage rises to a first preset voltage threshold, the first voltage regulator tube ZD1 is in reverse breakdown, the triode Q1 generates a driving current to conduct, and the driving current direction is D1- (Q1 b-Q1 e) -R1-ZD 1-GND.
Further, after the triode Q1 is turned on, because the second voltage stabilizing value of the second voltage regulator ZD2 is smaller than the first voltage stabilizing value of the first voltage regulator ZD1, the triode Q2 meets the conduction condition, the branch current flow direction is D1- (Q1 e-Q1 c) -R2- (Q2 b-Q2 e) -ZD 2-GND, at this time, the voltage value of the upper end pin of the first voltage regulator ZD1 is equal to the second voltage stabilizing value of the second voltage regulator ZD2, and the first voltage regulator ZD1 does not flow current any more.
Further, the base voltage of the transistor Q3 is the second regulated voltage value of the second regulator ZD2, and the current direction is D1 — (Q3 c-Q3 e) — Vout (main current loop) and D1 — (Q1 e-Q1 c) — R2 — (Q3 b-Q3 e) — Vout (driving current), the emitter of the transistor Q3 outputs a constant target voltage, and Q1, R1, R2, Q2, ZD2, and Q3 constitute a constant voltage power supply when operating, and output the constant target voltage.
When the voltage drop of each switch tube is ignored, the output constant target voltage is equal to the second voltage stabilizing value of the second voltage stabilizing tube.
Further, when the device is powered off, the Vin voltage gradually drops to be below a second preset voltage threshold, the second voltage regulator tube ZD2 does not flow any more, at this time, the first voltage regulator tube ZD1 does not have current, the triodes Q1 and Q2 do not meet the conduction condition, the triode Q3 is not conducted, and Vout is directly cut off for output.
When the voltage drop of each switching tube is considered, the first preset voltage threshold is greater than the first voltage value, and the second preset voltage threshold is greater than the second voltage value.
When the voltage of the input voltage of the power supply reaches a first preset voltage threshold value in the climbing process, the hysteresis constant-voltage power supply circuit 200 immediately starts to output a constant target voltage; when the input voltage of the power supply is lower than the second preset voltage threshold value in the process of reducing the input voltage of the power supply, the output is immediately cut off, and the hysteresis constant voltage power supply circuit 200 does not need to use a special comparison circuit and a special logic circuit and does not need to supply power for a control circuit independently, and has the advantages of simple circuit, simple manufacture and low cost, thereby simplifying the structure of the hysteresis constant voltage power supply circuit and improving the power quality of a power utilization circuit.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention.
Claims (11)
1. A hysteresis constant voltage power supply circuit, comprising: the starting switch unit, the first current-limiting resistor, the hysteresis voltage control unit, the second current-limiting resistor and the output switch unit;
the first end of the starting switch unit is used for externally connecting input power supply voltage and is connected with the first end of the output switch unit, the second end of the starting switch unit is connected with the first end of the hysteresis voltage control unit through the first current-limiting resistor, and the third end of the starting switch unit is connected with one end of the second current-limiting resistor;
the other end of the second current-limiting resistor is respectively connected with the second end of the hysteresis voltage control unit and the second end of the output switch unit, the third end of the hysteresis voltage control unit is grounded, and the third end of the output switch unit is used for outputting a constant target voltage;
the hysteresis voltage control unit is used for controlling the starting switch unit and the output switch unit to be conducted when the input power supply voltage rises to a first preset voltage threshold value, so that the output switch unit outputs a constant target voltage;
the hysteresis voltage control unit is further configured to control the start switch unit and the output switch unit to be turned off when the input power voltage drops to a second preset voltage threshold, where the second preset voltage threshold is smaller than the first preset voltage threshold.
2. The hysteresis constant voltage power supply circuit according to claim 1, wherein the hysteresis voltage control unit includes a first voltage stabilization unit, a second voltage stabilization unit, and a hysteresis control switch;
one end of the first voltage stabilizing unit is respectively connected with one end of the first current limiting resistor and the first end of the hysteresis control switch, and the other end of the first voltage stabilizing unit is grounded;
a second end of the hysteresis control switch is respectively connected with one end of the second current-limiting resistor and a second end of the output switch unit, one end of the second voltage stabilizing unit is connected with a third end of the hysteresis control switch, and the other end of the second voltage stabilizing unit is grounded;
the first voltage stabilizing value corresponding to the first voltage stabilizing unit is greater than the second voltage stabilizing value corresponding to the second voltage stabilizing unit, the first voltage stabilizing value is smaller than the first preset voltage threshold, and the second voltage stabilizing value is smaller than the second preset voltage threshold.
3. The hysteresis constant voltage power supply circuit of claim 2, wherein the first voltage stabilizing unit employs a first voltage stabilizing diode, a cathode of the first voltage stabilizing diode is connected to one end of the first current limiting resistor and the first end of the hysteresis control switch, and an anode of the first voltage stabilizing diode is grounded.
4. The hysteretic constant voltage power supply circuit according to claim 3, wherein the second voltage stabilizing unit employs a second voltage stabilizing diode, a cathode of the second voltage stabilizing diode is connected to the third terminal of the hysteretic control switch, and an anode of the second voltage stabilizing diode is grounded.
5. The hysteresis constant voltage power supply circuit of claim 2, wherein the hysteresis control switch is a triode or a MOS transistor.
6. The hysteresis constant voltage power supply circuit of claim 5, wherein the hysteresis control switch is an NPN transistor, a collector of the NPN transistor is a first terminal of the hysteresis control switch, a base of the NPN transistor is a second terminal of the hysteresis control switch, and an emitter of the NPN transistor is a third terminal of the hysteresis control switch.
7. The hysteresis constant voltage power supply circuit according to claim 1, further comprising an anti-reverse connection unit, one end of the anti-reverse connection unit being configured to be connected to the input power supply voltage, and the other end of the anti-reverse connection unit being respectively connected to the first end of the start switch unit and the first end of the output switch unit.
8. The hysteresis constant voltage power supply circuit according to claim 7, wherein the reverse connection preventing unit employs a diode.
9. The hysteresis constant voltage power supply circuit of claim 1, wherein the start switch unit is a transistor or a MOS transistor, and the output switch unit is a transistor or a MOS transistor.
10. The hysteretic constant voltage power supply circuit according to claim 9, wherein the start switch unit is a PNP transistor, an emitter of the PNP transistor is a first terminal of the start switch unit, a base of the PNP transistor is a second terminal of the start switch unit, and a collector of the PNP transistor is a third terminal of the start switch unit.
11. A hysteresis constant voltage power supply characterized by using the hysteresis constant voltage power supply circuit according to any one of claims 1 to 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020007517.4U CN211264194U (en) | 2020-01-02 | 2020-01-02 | Hysteresis constant voltage power supply circuit and hysteresis constant voltage power supply |
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| CN202020007517.4U CN211264194U (en) | 2020-01-02 | 2020-01-02 | Hysteresis constant voltage power supply circuit and hysteresis constant voltage power supply |
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| CN211264194U true CN211264194U (en) | 2020-08-14 |
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