CN218888122U - Power supply voltage output circuit - Google Patents
Power supply voltage output circuit Download PDFInfo
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- CN218888122U CN218888122U CN202223180753.4U CN202223180753U CN218888122U CN 218888122 U CN218888122 U CN 218888122U CN 202223180753 U CN202223180753 U CN 202223180753U CN 218888122 U CN218888122 U CN 218888122U
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Abstract
The application belongs to the field of power supply voltage, and discloses a power supply voltage output circuit which comprises a self-locking circuit and a linear negative feedback voltage stabilization output circuit; the self-locking circuit is connected with the linear negative feedback voltage stabilization output circuit; the self-locking circuit is used for realizing a self-locking function, outputting the accessed first voltage to the linear negative feedback voltage stabilization output circuit in a locking state, and stopping outputting the accessed first voltage to the linear negative feedback voltage stabilization output circuit in an unlocking state; the linear negative feedback voltage stabilization output circuit is used for converting the first voltage output by the self-locking circuit into a second voltage and adjusting the output second voltage through negative feedback adjustment, wherein the first voltage is greater than the second voltage. By adopting the power supply voltage control circuit, the power consumption of the power supply voltage control circuit can be reduced.
Description
Technical Field
The utility model relates to a supply voltage technical field especially relates to a supply voltage output circuit.
Background
At present, with the improvement of living standard of people, household appliances are more and more popularized. The power supply output voltage of the household appliance is a stable low-voltage power supply, so that power can be supplied to other circuits.
In the prior art, a low-voltage power supply control circuit of a household appliance power supply adopts an LM7805 type chip to realize the output of low-voltage power supply voltage. However, the power consumption of the chip of the LM7805 model is large, and the amount of generated heat is large, and further, a low-voltage power supply control circuit is additionally provided with a radiator for heat dissipation and cooling. Therefore, a power supply voltage control circuit with low power consumption is needed.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide a power supply voltage output circuit in order to solve the above-mentioned problems.
In a first aspect, a power supply voltage output circuit is provided, which comprises a self-locking circuit and a linear negative feedback voltage stabilization output circuit; wherein the content of the first and second substances,
the self-locking circuit is connected with the linear negative feedback voltage stabilization output circuit;
the self-locking circuit is used for realizing a self-locking function, outputting the accessed first voltage to the linear negative feedback voltage stabilization output circuit in a locking state, and stopping outputting the accessed first voltage to the linear negative feedback voltage stabilization output circuit in an unlocking state;
the linear negative feedback voltage stabilization output circuit is used for converting the first voltage output by the self-locking circuit into a second voltage and adjusting the output second voltage through negative feedback adjustment, wherein the first voltage is greater than the second voltage.
As an optional implementation manner, the self-locking circuit includes a first resistor, a second resistor, a third resistor, a control switch, a first thyristor, a second thyristor, a first diode, a second diode, and an electrolytic capacitor;
the first end of the first resistor is connected to the first voltage, the second end of the first resistor is connected to the first end of the control switch and the A pole of the first controlled silicon respectively, the second end of the control switch is connected to the anode of the first diode and the A pole of the second controlled silicon respectively, the cathode of the first diode is connected to the G pole of the first controlled silicon, the K pole of the first controlled silicon is connected to the first end of the second resistor and the linear negative feedback voltage-stabilizing output circuit respectively, the second end of the second resistor is connected to the anode of the second diode, the cathode of the second diode is connected to the first end of the third resistor and the anode of the electrolytic capacitor respectively, the second end of the third resistor is connected to the G pole of the second controlled silicon, and the K pole of the second controlled silicon is connected to the cathode of the electrolytic capacitor and grounded.
As an alternative embodiment, the linear negative feedback voltage stabilization output circuit comprises a reference voltage setting circuit and an output voltage sampling circuit;
the reference voltage setting circuit is respectively connected with the self-locking circuit and the output voltage sampling circuit and is used for regulating the output second voltage through negative feedback regulation;
the output voltage sampling circuit is connected with the reference voltage setting circuit and used for converting the first voltage output by the self-locking circuit into the second voltage.
As an optional implementation manner, the reference voltage setting circuit includes a fourth resistor, a fifth resistor, a first triode, a second triode, and a voltage regulator tube;
the first end of the fourth resistor is respectively connected with the self-locking circuit, the first end of the fifth resistor and the collector of the first triode, the second end of the fourth resistor is respectively connected with the emitter of the second triode and the cathode of the voltage stabilizing tube, the second end of the fifth resistor is respectively connected with the base of the first triode and the collector of the second triode, the emitter of the first triode and the base of the second triode are both connected with the output voltage sampling circuit, and the anode of the voltage stabilizing tube is grounded.
As an alternative embodiment, the output voltage sampling circuit includes a sixth resistor, a variable resistor and a seventh resistor;
the first end of the sixth resistor is connected with the emitting electrode of the first triode, the second end of the sixth resistor is connected with the first end of the variable resistor, the second end of the variable resistor is connected with the first end of the seventh resistor, the adjusting end of the variable resistor is connected with the base electrode of the second triode, and the second end of the seventh resistor is grounded.
As an alternative embodiment, the control switch is a key switch.
As an optional implementation manner, after the control switch is turned on, the first thyristor is in an on state, the second thyristor is in an off state, the first thyristor outputs the first voltage to the linear negative feedback voltage stabilization output circuit, and charges the electrolytic capacitor, and the self-locking circuit is in a locking state.
As an optional implementation manner, after the control switch is turned off, the electrolytic capacitor discharges, the second thyristor is in an on state, the first thyristor is in an off state, the first thyristor stops outputting the first voltage to the linear negative feedback voltage stabilization output circuit, and the self-locking circuit is in an unlocked state.
In an alternative embodiment, the first voltage is 12V and the second voltage is 5V.
The utility model provides a supply voltage output circuit, the technical scheme that the embodiment of this application provided brings following beneficial effect at least: the self-locking function of the power supply voltage control circuit can be realized through the self-locking circuit, the linear negative feedback voltage stabilization output circuit can perform negative feedback adjustment on the power supply voltage, and the adjustable stable low power supply voltage can be output. Therefore, the power supply voltage control circuit is prevented from adopting a chip of LM7805 model, the generated power consumption is reduced, the energy loss is reduced, an extra radiator is not needed to be added to the circuit, and the cost is further reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power supply voltage output circuit in the prior art according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a power supply voltage output circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Fig. 1 is a schematic structural diagram of a power supply voltage output circuit in the prior art according to an embodiment of the present invention. As shown in fig. 1, the output of the low-voltage power supply voltage is realized by using a chip of LM7805 type. However, the LM7805 model chip generates a large amount of power consumption and generates a large amount of heat, resulting in a large power loss.
Fig. 2 is a schematic structural diagram of a power supply voltage output circuit according to an embodiment of the present disclosure. As shown in fig. 2, the power supply voltage output circuit includes a self-locking circuit 201 and a linear negative feedback voltage stabilization output circuit 202. The self-locking circuit 201 is connected with the linear negative feedback voltage-stabilizing output circuit 202. The linear negative feedback regulated output circuit 202 includes a reference voltage setting circuit 2021 and an output voltage sampling circuit 2022.
The self-locking circuit 201 is connected to the linear negative feedback voltage stabilization output circuit 202, and is configured to implement a self-locking function, output the accessed first voltage to the linear negative feedback voltage stabilization output circuit 202 in a locked state, and stop outputting the accessed first voltage to the linear negative feedback voltage stabilization output circuit 202 in an unlocked state.
And the linear negative feedback voltage stabilization output circuit 202 is used for converting the first voltage output by the self-locking circuit 201 into a second voltage and adjusting the output second voltage through negative feedback adjustment, wherein the first voltage is greater than the second voltage.
The reference voltage setting circuit 2021 is respectively connected to the self-locking circuit 201 and the output voltage sampling circuit 2022, and is configured to adjust the output second voltage through negative feedback adjustment.
The output voltage sampling circuit 2022 is connected to the reference voltage setting circuit 2021, and is configured to obtain a first voltage output by the self-locking circuit 201 and convert the first voltage into a second voltage.
As an optional implementation, the self-locking circuit 201 includes a first resistor R1, a second resistor R5, a third resistor R4, a control switch S1, a first thyristor Q1, a second thyristor Q2, a first diode D1, a second diode D2, and an electrolytic capacitor EC1.
The first end of the first resistor R1 is connected with a first voltage, the second end of the first resistor R1 is respectively connected with the first end of the control switch S1 and the A pole of the first controlled silicon Q1, the second end of the control switch S1 is respectively connected with the anode of the first diode D1 and the A pole of the second controlled silicon Q2, the cathode of the first diode D1 is connected with the G pole of the first controlled silicon Q1, the K pole of the first controlled silicon Q1 is respectively connected with the first end of the second resistor R5 and the linear negative feedback voltage-stabilizing output circuit 202, the second end of the second resistor R5 is connected with the anode of the second diode D2, the cathode of the second diode D2 is respectively connected with the first end of the third resistor R4 and the anode of the electrolytic capacitor EC1, the second end of the third resistor R4 is connected with the G pole of the second controlled silicon Q2, and the K pole of the second controlled silicon Q2 is connected with the cathode of the electrolytic capacitor EC1 and grounded. Optionally, the control switch S1 is a key switch.
As an alternative embodiment, the reference voltage setting circuit 2021 includes a fourth resistor R3, a fifth resistor R2, a first transistor Q3, a second transistor Q4, and a voltage regulator ZD1.
The self-locking circuit 201, the first end of fifth resistance R2 and the collecting electrode of first triode Q3 are connected respectively to fourth resistance R3's first end, the second end of fourth resistance R3 connects the projecting pole of second triode Q4 and the negative pole of stabilivolt ZD1 respectively, the base of first triode Q3 and the collecting electrode of second triode Q4 are connected respectively to the second end of fifth resistance R2, output voltage sampling circuit 2022 is all connected to the projecting pole of first triode Q3 and the base of second triode Q4, stabilivolt ZD 1's positive pole ground GND.
As an alternative implementation, the output voltage sampling circuit 2022 includes a sixth resistor R6, a variable resistor R7, and a seventh resistor R8.
The first end of the sixth resistor R6 is connected with the emitting electrode of the first triode Q3, the second end of the sixth resistor R6 is connected with the first end of the variable resistor R7, the second end of the variable resistor R7 is connected with the first end of the seventh resistor R8, the adjusting end of the variable resistor R7 is connected with the base electrode of the second triode Q4, and the second end of the seventh resistor R8 is grounded GND.
Further, the self-locking circuit 201 realizes the self-locking function as follows.
After the control switch S1 is turned on, the first thyristor Q1 is in an on state, the second thyristor Q2 is in an off state, the first thyristor Q1 outputs a first voltage to the linear negative feedback voltage stabilization output circuit 202, and charges the electrolytic capacitor EC1, and the self-locking circuit 201 is in a locked state.
Specifically, after the control switch S1 is turned on, the first voltage passes through the first resistor R1, so that the a pole of the first thyristor Q1 is turned on. The first voltage passes through the first resistor R1, the control switch S1, and the first diode D1, so that the G-pole of the first thyristor Q1 is turned on. The K pole of the first thyristor Q1 outputs a first voltage to the linear negative feedback regulated output circuit 202. The first voltage charges the electrolytic capacitor EC1 through the K pole of the first controllable silicon Q1, the second resistor R5 and the second diode D2. Since the electrolytic capacitor EC1 cannot suddenly change, the positive voltage cannot be supplied to the G electrode of the second thyristor Q2, and therefore the second thyristor Q2 is turned off and the self-locking circuit 201 is in a locked state.
The linear negative feedback voltage stabilization output circuit 202 converts the first voltage output by the self-locking circuit 201 into a second voltage, and adjusts the output second voltage through negative feedback adjustment, wherein the specific implementation process that the first voltage is greater than the second voltage is as follows.
It should be noted that, a branch composed of the first triode Q3, the second triode Q4 and the voltage regulator ZD1 is connected in parallel with a branch composed of the sixth resistor R6, the variable resistor R7 and the seventh resistor R8. Therefore, the formula for determining the voltage of the zener diode ZD1 is:
V ZD1 ＝Vout*(R7’+R8)/(R6+R7+R8)
wherein Vout represents the second voltage, V ZD1 Representing the voltage, R, of the zener diode ZD1 6 Representing the resistance of the sixth resistor R6, R 7 Represents the maximum resistance of the variable resistor R7, R 7’ Representing the current resistance, R, after adjustment of the variable resistance 8 Representing the resistance of the seventh resistor R8.
Derived from the above equation, the equation for determining the second voltage is:
V out ＝V ZD1 *(R 6 +R 7 +R 8 )/(R 7’ +R 8 )
wherein Vout represents the second voltage, V ZD1 Representing the voltage, R, of a voltage-regulator tube ZD1 6 Represents the resistance of the sixth resistor R6, R 7 Represents the maximum resistance of the variable resistor R7, R 7’ Representing the current resistance, R, after adjustment of the variable resistance 8 Representing the resistance of the seventh resistor R8.
When the K pole of the first thyristor Q1 outputs the first voltage to the linear negative feedback voltage stabilization output circuit 202, the first voltage reaches the voltage regulator ZD1 through the fourth resistor R3. The first voltage reaches the voltage regulator ZD1 through the fifth resistor R2 and the second transistor Q4. At this time, the first voltage discharges to the voltage regulator tube ZD1 through the fourth resistor R3, and the voltage of the emitter of the second triode Q4 is the voltage of the voltage regulator tube ZD1, that is, ve _ Q4= V ZD1 . At this time, the second triode Q4 is in a linear amplification state, and according to the working principle of the triode amplification state, the collector voltage of the second triode Q4 is as follows: vc _ Q4= Vout +0.7V (Vbe _ Q3 ≈ 0.7V), where Vc _ Q4 denotes a collector voltage of the second transistor Q4, vout denotes a second voltage, and Vbe _ Q3 denotes a base-emitter bias voltage of the first transistor Q3. At this time, the collector voltage of the second triode Q4 is turned on with the change of the second voltage. When the first voltage 12V is connected to the collector of the second transistor Q4 through the fifth resistor R2, so as to provide a bias voltage for the first transistor Q3 to conduct into a linear amplification state, the first transistor Q3 acts as a variable resistor for dividing between the first voltage and the second voltage.
Further, negative feedback of the second voltageThe process of adjustment is as follows: when the second voltage rises, the voltage of the base of the second triode Q4 is 5.7V (Ve _ Q4= V) which is the regulated value of the voltage regulator ZD1 (Ve _ Q4= V) ZD1 ) At this time, if the second voltage rises → the voltage of the variable resistor R7 rises → the base current of the second transistor Q4 rises → the base-emitter bias voltage of the second transistor Q4 rises → the emitter voltage of the second transistor Q4 rises → the base-emitter bias voltage of the first transistor Q3 rises → the current of the base of the first transistor Q3 rises → the current of the emitter of the first transistor Q3 rises → the voltage between the collector and the emitter of the first transistor Q3 rises → the second voltage falls. Thus, the linear negative feedback voltage stabilization output circuit 202 is realized to adjust the output stable and adjustable second voltage through negative feedback.
It should be noted that, due to the characteristics of the thyristor, when the thyristor is turned on, if the thyristor is to be turned off, the thyristor needs to be connected with a reverse current or the a pole and the K pole of the thyristor need to be grounded. Therefore, a branch circuit composed of the second resistor R5, the third resistor R4, the second thyristor Q2, the second diode D2 and the electrolytic capacitor EC1 needs to be designed in the self-locking circuit 201 to cut off the first thyristor Q1.
After the control switch S1 is turned off, the electrolytic capacitor EC1 discharges, the second thyristor Q2 is in a conducting state, the first thyristor Q1 is in a blocking state, the first thyristor Q1 stops outputting the first voltage to the linear negative feedback voltage stabilization output circuit 202, and the self-locking circuit 201 is in an unlocking state.
Specifically, after the control switch S1 is turned off, the first voltage passes through the first resistor R1 and the control switch S1 to provide a positive voltage to the a pole of the second thyristor Q2. At this time, the electrolytic capacitor EC1 is fully charged, and the electrolytic capacitor EC1 is discharged. The electrolytic capacitor EC1 supplies a positive voltage to the G pole of the second thyristor Q2. Therefore, at the instant when the control switch S1 is turned off, the second thyristor Q2 is turned on. The resistance of the thyristor is close to zero after being conducted, and the thyristor can be regarded as a lead. Therefore, the first voltage passes through the first resistor R1, the control switch S1 and the second controllable silicon Q2, and then is grounded. Thus, the first thyristor Q1 is short-circuited to an off state. The first thyristor Q1 stops outputting the first voltage to the linear negative feedback voltage stabilization output circuit 202, and the self-locking circuit 201 is in an unlocking state.
Optionally, the first voltage is 12V, the second voltage is 5V, and the first voltage and the second voltage may also be set according to an actual application situation, which is not limited herein.
The prior art shown in fig. 1 uses a chip of type LM7805 to implement the output of the low-voltage power supply voltage. However, the LM7805 model chip generates a large amount of power consumption and generates a large amount of heat, resulting in a large power loss. The event the embodiment of the utility model provides a supply voltage output circuit can realize supply voltage control circuit's self-locking function through self-locking module, and negative feedback steady voltage source module can carry out negative feedback regulation to supply voltage, can export adjustable stable low supply voltage. The power supply voltage control circuit is prevented from adopting a chip of LM7805 type, the generated power consumption is reduced, the energy loss is reduced, the circuit does not need to be additionally provided with an extra radiator, and the cost is further reduced.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
It should be further noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for presentation, analyzed data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (9)
1. A power supply voltage output circuit is characterized by comprising a self-locking circuit and a linear negative feedback voltage-stabilizing output circuit; wherein the content of the first and second substances,
the self-locking circuit is connected with the linear negative feedback voltage stabilization output circuit;
the self-locking circuit is used for realizing a self-locking function, outputting the accessed first voltage to the linear negative feedback voltage-stabilizing output circuit in a locking state, and stopping outputting the accessed first voltage to the linear negative feedback voltage-stabilizing output circuit in an unlocking state;
the linear negative feedback voltage stabilization output circuit is used for converting the first voltage output by the self-locking circuit into a second voltage and regulating the output second voltage through negative feedback, and the first voltage is greater than the second voltage.
2. The circuit of claim 1, wherein the self-locking circuit comprises a first resistor, a second resistor, a third resistor, a control switch, a first thyristor, a second thyristor, a first diode, a second diode, and an electrolytic capacitor;
the first end of the first resistor is connected to the first voltage, the second end of the first resistor is connected to the first end of the control switch and the A pole of the first controlled silicon respectively, the second end of the control switch is connected to the anode of the first diode and the A pole of the second controlled silicon respectively, the cathode of the first diode is connected to the G pole of the first controlled silicon, the K pole of the first controlled silicon is connected to the first end of the second resistor and the linear negative feedback voltage-stabilizing output circuit respectively, the second end of the second resistor is connected to the anode of the second diode, the cathode of the second diode is connected to the first end of the third resistor and the anode of the electrolytic capacitor respectively, the second end of the third resistor is connected to the G pole of the second controlled silicon, and the K pole of the second controlled silicon is connected to the cathode of the electrolytic capacitor and grounded.
3. The circuit of claim 1, wherein the linear negative feedback regulated output circuit comprises a reference voltage setting circuit and an output voltage sampling circuit;
the reference voltage setting circuit is respectively connected with the self-locking circuit and the output voltage sampling circuit and is used for regulating the output second voltage through negative feedback;
the output voltage sampling circuit is connected with the reference voltage setting circuit and used for converting the first voltage output by the self-locking circuit into the second voltage.
4. The circuit of claim 3, wherein the reference voltage setting circuit comprises a fourth resistor, a fifth resistor, a first triode, a second triode and a voltage regulator tube;
the first end of the fourth resistor is respectively connected with the self-locking circuit, the first end of the fifth resistor and the collector of the first triode, the second end of the fourth resistor is respectively connected with the emitter of the second triode and the cathode of the voltage stabilizing tube, the second end of the fifth resistor is respectively connected with the base of the first triode and the collector of the second triode, the emitter of the first triode and the base of the second triode are both connected with the output voltage sampling circuit, and the anode of the voltage stabilizing tube is grounded.
5. The circuit of claim 4, wherein the output voltage sampling circuit comprises a sixth resistor, a variable resistor, and a seventh resistor;
the first end of the sixth resistor is connected with the emitting electrode of the first triode, the second end of the sixth resistor is connected with the first end of the variable resistor, the second end of the variable resistor is connected with the first end of the seventh resistor, the adjusting end of the variable resistor is connected with the base electrode of the second triode, and the second end of the seventh resistor is grounded.
6. The circuit of claim 2, wherein the control switch is a push button switch.
7. The circuit of claim 2, wherein after the control switch is turned on, the first thyristor is turned on, the second thyristor is turned off, the first thyristor outputs the first voltage to the linear negative feedback voltage stabilization output circuit and charges the electrolytic capacitor, and the self-locking circuit is in a locked state.
8. The circuit of claim 2, wherein after the control switch is turned off, the electrolytic capacitor is discharged, the second thyristor is turned on, the first thyristor is turned off, the first thyristor stops outputting the first voltage to the linear negative feedback voltage stabilization output circuit, and the self-locking circuit is in an unlocked state.
9. The circuit of claim 1, wherein the first voltage is 12V and the second voltage is 5V.
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| CN202223180753.4U CN218888122U (en) | 2022-11-29 | 2022-11-29 | Power supply voltage output circuit |
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| CN202223180753.4U CN218888122U (en) | 2022-11-29 | 2022-11-29 | Power supply voltage output circuit |
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