CN206532171U - A kind of power circuit for isolating Serial regulation output - Google Patents

A kind of power circuit for isolating Serial regulation output Download PDF

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Publication number
CN206532171U
CN206532171U CN201720244249.6U CN201720244249U CN206532171U CN 206532171 U CN206532171 U CN 206532171U CN 201720244249 U CN201720244249 U CN 201720244249U CN 206532171 U CN206532171 U CN 206532171U
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operational amplifier
resistor
signal
unit
output
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曲海英
韩丰娟
张宪宝
孙丹阳
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Beijing Xinyuan Technology Development LLC
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Beijing Xinyuan Technology Development LLC
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Abstract

The utility model embodiment provides a kind of power circuit for isolating Serial regulation output, including:Signal input unit, signal AM unit, phototube coupling unit, signal adjust unit and signal protection unit;The output end of the signal input unit is connected with the input of the signal AM unit; the output end of the signal AM unit is connected with the input of the phototube coupling unit; the input that the output end of the phototube coupling unit adjusts unit with the signal is connected; the signal protection unit is connected with the output end that the signal adjusts unit; the signal AM unit, the signal adjust unit and the signal protection unit connects different ground respectively, electrically connectionless.The signal AM unit, signal adjust unit and signal protection unit not altogether; it is safe; insulation request is met, signal is carried out isolation linear process, the power circuit is realized the linear regulation of output voltage in relative broad range by signal AM unit and phototube coupling unit.

Description

Power supply circuit for isolating linear adjustment output
Technical Field
The utility model relates to a power technical field especially relates to a keep apart power supply circuit of linear adjustment output.
Background
In the field of high-frequency switching power supplies, an output voltage regulation signal is placed on one side of an output function circuit. In practice, the input and output of a high frequency switching power supply are often electrically isolated, so that when a voltage regulation signal given by a user is common to the input, output voltage regulation cannot be achieved. When this happens, the user has only two methods:
the method comprises the following steps: the output ground of the power supply is grounded with the input ground to realize the function of regulating the output voltage, but the function of isolating the input from the output is sacrificed, which is not allowed in the occasion with safety requirement;
the method 2 comprises the following steps: the user transmits the output voltage signal to the output side through the isolation chip, so that the design difficulty of the user is increased, and wide-range linear adjustment cannot be realized.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a keep apart power supply circuit of linear adjustment output to solve prior art's power supply circuit security low and can't realize the problem of wide range linear adjustment.
The embodiment of the utility model provides a keep apart power supply circuit of linear adjustment output, include: the device comprises a signal input unit, a signal amplitude modulation unit, a photoelectric isolation unit, a signal setting unit and a signal protection unit; the output end of the signal input unit is connected with the input end of the signal amplitude modulation unit, the output end of the signal amplitude modulation unit is connected with the input end of the photoelectric isolation unit, the output end of the photoelectric isolation unit is connected with the input end of the signal setting unit, the signal protection unit is connected with the output end of the signal setting unit, and the signal amplitude modulation unit, the signal setting unit and the signal protection unit are respectively connected with different grounds.
Further, the signal amplitude modulation unit includes: the circuit comprises a first operational amplifier, a first resistor, a second resistor, a first adjustable resistor and a first power supply; a first output end of the signal input unit is connected with a non-inverting input end of the first operational amplifier, and a second output end of the signal input unit is connected with a negative pin of the first operational amplifier; the output end of the first operational amplifier is connected with one end of the second resistor, the positive pin of the first operational amplifier is connected with the first power supply, the negative pin of the first operational amplifier is connected with the negative input end of the photoelectric isolation unit, and the negative pin of the first operational amplifier is grounded; the other end of the second resistor is connected with the positive input end of the photoelectric isolation unit; one end of the first resistor is connected with a negative pin of the first operational amplifier, and the other end of the first resistor is connected with an inverted input end of the first operational amplifier; one end of the first adjustable resistor is connected with the inverted input end of the first operational amplifier, and the other end of the first adjustable resistor is connected with the output end of the first operational amplifier.
Further, the signal amplitude modulation unit further includes: and one end of the third resistor is connected with the first output end of the signal input unit, and the other end of the third resistor is connected with the non-inverting input end of the first operational amplifier.
Further, the signal amplitude modulation unit further includes: one polar plate of the first capacitor is connected with the positive pin of the first operational amplifier, and the other polar plate of the first capacitor is connected with the negative pin of the first operational amplifier; and/or, the signal amplitude modulation unit further includes: and one polar plate of the second capacitor is connected with the other end of the second resistor, and the other polar plate of the second capacitor is connected with the negative pin of the first operational amplifier.
Further, the signal setting unit includes: the power supply comprises a fourth resistor, a fifth resistor, a second adjustable resistor, a second operational amplifier, a third operational amplifier, a diode, a sixth resistor and a second power supply; the emitter of the photoelectric isolation unit is respectively connected with the non-inverting input end of the second operational amplifier and one end of the fourth resistor, and the collector of the photoelectric isolation unit is connected with the positive pin of the second operational amplifier; the other end of the fourth resistor is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with the negative input end of the second operational amplifier; the output end of the second operational amplifier is connected with the positive input end of the third operational amplifier, the positive pin of the second operational amplifier is connected with the second power supply, the negative pin of the second operational amplifier is connected with the other end of the fourth resistor, and the negative pin of the second operational amplifier is grounded; one end of the second adjustable resistor is connected with the inverted input end of the second operational amplifier, and the other end of the second adjustable resistor is connected with the output end of the second operational amplifier; the inverting input end of the third operational amplifier is connected with the output end of the third operational amplifier, and the output end of the third operational amplifier is connected with the anode of the diode; and the cathode of the diode is connected with one end of the sixth resistor, and the other end of the sixth resistor is connected with an output signal point.
Further, the signal tuning unit further includes: one end of the seventh resistor is connected with the collector of the photoelectric isolation unit, and the other end of the seventh resistor is connected with the anode pin of the second operational amplifier.
Further, the signal protection unit includes: the eighth resistor, the ninth resistor, the tenth resistor and the reference voltage source; one end of the eighth resistor is connected with the cathode of the diode, and the other end of the eighth resistor is connected with the output end of the reference voltage source; one end of the ninth resistor is connected with the output end of the reference voltage source, and the other end of the ninth resistor is connected with the reference end of the reference voltage source; one end of the tenth resistor is connected with the reference end of the reference voltage source, and the other end of the tenth resistor is connected with the grounding end of the reference voltage source; and the grounding end of the reference voltage source is grounded.
Further, the signal protection unit further includes: and one polar plate of the third capacitor is connected with the reference end of the reference voltage source, and the other polar plate of the third capacitor is connected with the grounding end of the reference voltage source.
Further, still include: an output voltage control unit including: the fourth operational amplifier, the eleventh resistor, the twelfth resistor, the output voltage monitor and the second power supply source; the negative phase input end of the fourth operational amplifier is connected with the negative electrode of the diode, the non-negative phase input end of the fourth operational amplifier is connected with the grounding end of the reference voltage source, the positive pin of the fourth operational amplifier is connected with the second power supply, and the output end of the fourth operational amplifier outputs a control signal; one end of the eleventh resistor is connected with the non-inverting input end of the fourth operational amplifier, and the other end of the eleventh resistor is connected with the output voltage monitor; one end of the twelfth resistor is connected with the non-inverting input end of the fourth operational amplifier, and the other end of the twelfth resistor is connected with the negative pin of the fourth operational amplifier; or the non-inverting input end of the fourth operational amplifier is connected with the cathode of the diode, the inverting input end of the fourth operational amplifier is connected with the grounding end of the reference voltage source, the positive pin of the fourth operational amplifier is connected with the second power supply, and the output end of the fourth operational amplifier outputs a control signal; one end of the eleventh resistor is connected with the inverted input end of the fourth operational amplifier, and the other end of the eleventh resistor is connected with the output voltage monitor; one end of the twelfth resistor is connected with the inverting input end of the fourth operational amplifier, and the other end of the twelfth resistor is connected with the negative pin of the fourth operational amplifier.
Further: further comprising: an output voltage control unit including: the fourth operational amplifier, the eleventh resistor, the twelfth resistor, the output voltage monitor and the third power supply source; the negative phase input end of the fourth operational amplifier is connected with the negative electrode of the diode, the non-negative phase input end of the fourth operational amplifier is connected with the grounding end of the reference voltage source, the positive pin of the fourth operational amplifier is connected with the third power supply, and the output end of the fourth operational amplifier outputs a control signal; one end of the eleventh resistor is connected with the non-inverting input end of the fourth operational amplifier, and the other end of the eleventh resistor is connected with the output voltage monitor; one end of the twelfth resistor is connected with the non-inverting input end of the fourth operational amplifier, and the other end of the twelfth resistor is connected with the negative pin of the fourth operational amplifier; or the non-inverting input end of the fourth operational amplifier is connected with the cathode of the diode, the inverting input end of the fourth operational amplifier is connected with the grounding end of the reference voltage source, the positive pin of the fourth operational amplifier is connected with the third power supply, and the output end of the fourth operational amplifier outputs a control signal; one end of the eleventh resistor is connected with the inverted input end of the fourth operational amplifier, and the other end of the eleventh resistor is connected with the output voltage monitor; one end of the twelfth resistor is connected with the inverting input end of the fourth operational amplifier, and the other end of the twelfth resistor is connected with the negative pin of the fourth operational amplifier.
Therefore, in the embodiment of the utility model provides an in, this power supply circuit's signal amplitude modulation unit, signal setting unit and signal protection unit are not on the same ground, and the security is high to signal amplitude modulation unit and optoelectronic isolation unit keep apart linear processing with the signal, make this power supply circuit can realize output voltage's linear regulation in the broad range.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a circuit diagram of a power circuit for isolating a linear regulated output according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a power circuit for isolating a linear regulated output according to another embodiment of the present invention.
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 some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The embodiment of the utility model discloses keep apart power supply circuit of linear adjustment output. Fig. 1 is a circuit diagram of a power circuit for isolating linear regulated output according to an embodiment of the present invention. The power supply circuit for isolating the linear adjustment output specifically comprises: the device comprises a signal input unit 1, a signal amplitude modulation unit 2, a photoelectric isolation unit 3, a signal setting unit 4 and a signal protection unit 5. The output end of the signal input unit 1 is connected with the input end of the signal amplitude modulation unit 2. The output end of the signal amplitude modulation unit 2 is connected with the input end of the photoelectric isolation unit 3. The output end of the photoelectric isolation unit 3 is connected with the input end of the signal setting unit 4. The signal protection unit 5 is connected with the output end of the signal setting unit 4. The signal amplitude modulation unit 2, the signal setting unit 4 and the signal protection unit 5 are respectively connected with different grounds.
Specifically, the signal input unit 1 is used to input and process signals. The signal is given by the user and may be a digital signal or an analog signal. The signal input unit 1 includes a signal processor 11, which can perform corresponding processing according to different signals. For example, if the signal is an analog signal, filtering is adopted; if the signal is digital, rectification and filtering are adopted.
The signal amplitude modulation unit 2 is used for determining the amplitude of the signal on the input side according to the range of the voltage regulating signal and reducing the signal transmission loss.
Specifically, the signal amplitude modulation unit 2 includes: the circuit comprises a first operational amplifier N1, a first resistor R1, a second resistor R2, a first adjustable resistor RT1 and a first power supply VCC 1. The first output end of the signal input unit 1 is connected with the non-inverting input end of the first operational amplifier N1, and the second output end of the signal input unit 1 is connected with the negative pin of the first operational amplifier N1. The output end of the first operational amplifier N1 is connected with one end of the second resistor R2, the positive pole pin of the first operational amplifier N1 is connected with the first power supply VCC1, the negative pole pin of the first operational amplifier N1 is connected with the negative pole input end of the photoelectric isolation unit 3, and the negative pole pin of the first operational amplifier N1 is grounded. The other end of the second resistor R2 is connected to the positive input terminal of the photoelectric isolation unit 3. One end of the first resistor R1 is connected with the negative pin of the first operational amplifier N1, and the other end of the first resistor R1 is connected with the inverting input end of the first operational amplifier N1. One end of the first adjustable resistor RT1 is connected with the inverting input end of the first operational amplifier N1, and the other end of the first adjustable resistor RT2 is connected with the output end of the first operational amplifier N1.
The signal amplitude modulation of the input side is realized by a first operational amplifier N1, a first adjustable resistor RT1 and a first resistor R1. It should be understood that the resistor mentioned in the present embodiment is a fixed resistor, if not particularly limited. The input signal is connected to the non-inverting input end of the first operational amplifier N1, the first adjustable resistor RT1 and the first resistor R1 determine the amplification scale factor of the signal, and the size of the signal output by the first operational amplifier N1 is (1+ RT1/R1) times of the input signal. The input side signal after amplitude modulation is limited by the second resistor R2 and converted into a proper current signal. This signal is passed to the output side to control the magnitude of the output voltage. The first power supply VCC1 is a stable power supply and is common to the input side.
Preferably, the signal amplitude modulation unit 2 further includes: and a third resistor R3. One end of the third resistor R3 is connected to the first output terminal of the signal input unit 1, and the other end of the third resistor R3 is connected to the non-inverting input terminal of the first operational amplifier N1. The input signal is connected to the non-inverting input terminal of the first operational amplifier N1 through the third resistor R3, and if the input signal is too large, a voltage divider may be provided before the third resistor R3 to reduce the amplitude of the input signal. Therefore, the third resistor R3 can protect the circuit safety, optimize parameters, prevent noise disturbance, etc.
Preferably, the signal amplitude modulation unit 2 further includes: a first capacitor C1. One pole plate of the first capacitor C1 is connected with the positive pole pin of the first operational amplifier N1, and the other pole plate of the first capacitor C1 is connected with the negative pole pin of the first operational amplifier N1. The first capacitor C1 functions to stabilize the power supplied by the first power supply VCC1 to the first operational amplifier N1.
Preferably, the signal amplitude modulation unit 2 further includes: a second capacitor C2. One pole plate of the second capacitor C2 is connected with the other end of the second resistor R2, and the other pole plate of the second capacitor C2 is connected with the negative pole pin of the first operational amplifier N1. The second capacitor C2 functions to prevent the signal from being disturbed, so that the signal is smoothly transferred to the photoelectric isolation unit 3.
Specifically, the photoelectric isolation unit 3 includes: a Light Emitting Diode (LED) and a photosensitive semiconductor tube (VT). The anode input end of the light emitting diode LED is connected to the other end of the second resistor R2, and the cathode input end of the light emitting diode 21 is connected to the cathode pin of the first operational amplifier N1. The collector of the photosensitive transistor VT is connected with the anode pin of the second operational amplifier N2, and the emitter of the photosensitive transistor VT is respectively connected with the non-inverting input terminal of the second operational amplifier and one end of the fourth resistor R4. The current signal input to the photoelectric isolation unit 3 is multiplied by the transfer ratio β of the photoelectric isolation unit 3 to obtain the magnitude of the current signal I1 output by the photoelectric isolation unit 3.
Specifically, the signal setting unit 4 includes: the circuit comprises a fourth resistor R4, a fifth resistor R5, a second adjustable resistor RT2, a second operational amplifier N2, a third operational amplifier N3, a diode VD, a sixth resistor R6 and a second power supply VCC 2. The emitter of the photoelectric isolation unit 3 is connected to the non-inverting input terminal of the second operational amplifier N2 and one end of the fourth resistor R4, respectively, and the collector of the photoelectric isolation unit 3 is connected to the positive pin of the second operational amplifier N2. The other end of the fourth resistor R4 is connected with one end of a fifth resistor R5, and the other end of the fifth resistor R5 is connected with the negative input end of the second operational amplifier N2. The output end of the second operational amplifier N2 is connected with the anode input end of the third operational amplifier N3, the anode pin of the second operational amplifier N2 is connected with the second power supply VCC2, the cathode pin of the second operational amplifier N2 is connected with the other end of the fourth resistor R4, and the cathode pin of the second operational amplifier N2 is grounded. One end of a second adjustable resistor RT2 is connected with the inverting input end of the second operational amplifier N2, and the other end of the second adjustable resistor RT2 is connected with the output end of the second operational amplifier N2. The inverting input end of the third operational amplifier N3 is connected with the output end of the third operational amplifier N3, and the output end of the third operational amplifier N3 is connected with the anode of the diode VD. The cathode of the diode VD is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to the output signal point SS. The user can apply the output voltage adjustment signal on the output side if desired, by applying a resistor directly to the output signal point SS. In this case, the user can adjust the signal via the input side or via the output side. The signal processing of the output signal point SS is very simple, and only the direct access is needed after the processing according to the requirement of the signal amplitude.
The fourth resistor R4 converts the output-side current signal I1 into a voltage signal, which has the following magnitude: i1 XR 4 was designated as V1. If the fourth resistor R4 is too large, it will cause the output voltage signal V1 to be too large. The fact that the voltage V1 is too large can prevent the second operational amplifier N2 from accurately adjusting the signal, and the signal is distorted due to saturation. If the fourth resistor R4 is too small, increased line losses result. Therefore, the magnitude of V1 determined by the fourth resistor R4 must ensure that the output signal of the second operational amplifier N2 is still in the linear region when the amplification factor of the second operational amplifier N2 is at its maximum. The second operational amplifier N2, the second adjustable resistor RT2 and the fifth resistor R5 further modify the V1, so that the V1 signal is processed to achieve output voltage linear adjustment, and simultaneously, the linear adjustment range is maximized. The output signal of the second operational amplifier N2 has a magnitude of V1 × (1+ RT2/R5), which acts to restore the signal to true range. This amplitude must be lower than the amplitude of the second power supply VCC 2. If a subtraction operation is applied to the second op-amp N2, the output amplitude of the second op-amp N2 may be scaled down. The third operational amplifier N3 performs first-stage voltage following on the signal, so that the interference of a rear-stage circuit on a front-stage circuit is avoided.
Preferably, the signal tuning unit 4 further includes: a seventh resistor R7. One end of the seventh resistor R7 is connected to the collector of the photo-isolation unit 3, and the other end of the seventh resistor R7 is connected to the positive pin of the second operational amplifier N2. The seventh resistor R7 can protect the circuit safety, optimize parameters, prevent noise disturbance, etc.
Specifically, the signal protection unit 5 includes: an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and a reference voltage source IC. One end of the eighth resistor R8 is connected to the cathode of the diode VD, and the other end of the eighth resistor R8 is connected to the output end of the reference voltage source IC. One end of the ninth resistor R9 is connected to the output terminal of the reference voltage source IC, and the other end of the ninth resistor R9 is connected to the reference terminal of the reference voltage source IC. One end of the tenth resistor R10 is connected to the reference terminal of the reference voltage source IC, and the other end of the tenth resistor R10 is connected to the ground terminal of the reference voltage source IC. The ground terminal of the reference voltage source IC is grounded.
The signal protection unit 5 is used for preventing the signal on the output side from being too high due to the misadjustment of the signal on the input side or circuit failure, so that the output voltage is too high, and the user load or the power supply is damaged. The reference voltage source IC has a built-in reference. The voltage division of the external eighth resistor R8 and the ninth resistor R9 determines the maximum voltage limited by the reference voltage source IC. When the output side signal is too large and the signal of the reference terminal of the reference voltage source IC exceeds a set value, the reference voltage source IC operates to eliminate the portion exceeding the set value and maintain the portion at the set value (that is, the maximum output side signal allowed). When the output voltage of the diode VD is too high, the output terminal of the reference voltage source IC and the ground terminal are short-circuited, so that the output voltage of the diode VD is reduced, and the tenth resistor R10 plays a role in limiting the current, thereby limiting the reduction amplitude of the output voltage of the diode VD from being too large, resulting in output voltage fluctuation.
Preferably, the signal protection unit 4 further includes: and one polar plate of the third capacitor C3, one polar plate of the third capacitor C3 is connected with the reference end of the reference voltage source IC, and the other polar plate of the third capacitor C3 is connected with the grounding end of the reference voltage source IC. The third capacitor C3 acts to protect the signal from interference.
Preferably, the power supply circuit for isolating a linearly regulated output further includes: and an output voltage control unit 6. The output voltage control unit 6 includes: the circuit comprises a fourth operational amplifier N4, an eleventh resistor R11, a twelfth resistor R12, an output voltage monitor Vr and a second power supply VCC 2. An inverting input end (or a non-inverting input end) of the fourth operational amplifier N4 is connected to a cathode of the diode VD, a non-inverting input end (or a non-inverting input end) of the fourth operational amplifier N4 is connected to a ground end of the reference voltage source IC, an anode pin of the fourth operational amplifier N4 is connected to the second power supply VCC2, and an output end of the fourth operational amplifier N4 outputs the control signal Ctrol. One end of the eleventh resistor R11 is connected to the non-inverting input terminal (or the inverting input terminal) of the fourth operational amplifier N4, and the other end of the eleventh resistor R11 is connected to the output voltage monitor Vr. One end of the twelfth resistor R12 is connected to the non-inverting input terminal (or the inverting input terminal) of the fourth operational amplifier N4, and the other end of the twelfth resistor R12 is connected to the negative pin of the fourth operational amplifier N4. Preferably, as shown in fig. 2, the output voltage control unit 6 may further include: the third power supply VCC3, the output voltage control unit 6 does not need to share the second power supply VCC2 with the signal tuning unit 4. The fourth op-amp N4 is independently powered by a third power supply VCC 3. Specifically, the third power supply VCC3 is connected to the positive pin of the fourth operational amplifier N4, and the positive pin of the fourth operational amplifier N4 is not required to be connected to the second power supply VCC 2.
The eleventh resistor R11 and the twelfth resistor R12 sample the output actual voltage, and the voltage of the voltage point Vr is adopted, so that the current output voltage can be obtained, and whether the voltage is in a set range or not can be monitored. This is actually applied to the non-inverting input (which may be either the non-inverting or inverting input, determined by other circuitry that follows, and is applied to the non-inverting input shown in fig. 1 and 2) of the fourth op-amp N4. And the processed output side signal is added at the output end of the fourth operational amplifier N4 to output a control signal Ctrol. The output control signal Ctrol is accurately matched with the V1 signal processed by the signal setting unit 4. The signal generated by the fourth op-amp N4 will control the magnitude of the output voltage according to the needs and transfer function inside the power supply.
To sum up, the power circuit for isolating linear adjustment output of the embodiment of the present invention avoids the loss of isolation function due to the use of input side output voltage adjustment signal, combines voltage amplitude modulation and signal transmission current amplitude limiting, meets the signal isolation transmission requirement, avoids the loss of input side signal near the maximum value or near the minimum value (effective signal loss due to LED voltage drop) to the maximum extent, and can adjust the isolation level according to the user's requirement; when the signal does not reach the set maximum value, the voltage signal of the output side linearly changes along with the external control signal, and is stabilized at the maximum value after reaching the maximum value, so that the output voltage is protected from exceeding the allowed maximum voltage at any time; the circuit can receive digital signals and analog signals, can receive input-side signals and output-side signals, and has the operating characteristic of a completely-isolated friendly circuit; the signal is not required to be processed by a user, and only the signal is required to be connected to a corresponding functional pin; the power supply can integrate the functions of signal processing, compensation, isolation, signal gain adjustment, protection and the like, so that the design difficulty is reduced, and the cost is reduced.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the invention.
Finally, it should also be 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 terminal 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 terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
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. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A power supply circuit for isolating a linearly regulated output, comprising: the device comprises a signal input unit, a signal amplitude modulation unit, a photoelectric isolation unit, a signal setting unit and a signal protection unit; the output end of the signal input unit is connected with the input end of the signal amplitude modulation unit, the output end of the signal amplitude modulation unit is connected with the input end of the photoelectric isolation unit, the output end of the photoelectric isolation unit is connected with the input end of the signal setting unit, the signal protection unit is connected with the output end of the signal setting unit, and the signal amplitude modulation unit, the signal setting unit and the signal protection unit are respectively connected with different grounds.
2. The power supply circuit according to claim 1, wherein the signal amplitude modulation unit comprises: the circuit comprises a first operational amplifier, a first resistor, a second resistor, a first adjustable resistor and a first power supply; wherein,
a first output end of the signal input unit is connected with a non-inverting input end of the first operational amplifier, and a second output end of the signal input unit is connected with a negative pin of the first operational amplifier;
the output end of the first operational amplifier is connected with one end of the second resistor, the positive pin of the first operational amplifier is connected with the first power supply, the negative pin of the first operational amplifier is connected with the negative input end of the photoelectric isolation unit, and the negative pin of the first operational amplifier is grounded;
the other end of the second resistor is connected with the positive input end of the photoelectric isolation unit;
one end of the first resistor is connected with a negative pin of the first operational amplifier, and the other end of the first resistor is connected with an inverted input end of the first operational amplifier;
one end of the first adjustable resistor is connected with the inverted input end of the first operational amplifier, and the other end of the first adjustable resistor is connected with the output end of the first operational amplifier.
3. The power supply circuit according to claim 2, wherein the signal amplitude modulation unit further comprises: and one end of the third resistor is connected with the first output end of the signal input unit, and the other end of the third resistor is connected with the non-inverting input end of the first operational amplifier.
4. The power supply circuit according to claim 2,
the signal amplitude modulation unit further includes: one polar plate of the first capacitor is connected with the positive pin of the first operational amplifier, and the other polar plate of the first capacitor is connected with the negative pin of the first operational amplifier; and/or the presence of a gas in the gas,
the signal amplitude modulation unit further includes: and one polar plate of the second capacitor is connected with the other end of the second resistor, and the other polar plate of the second capacitor is connected with the negative pin of the first operational amplifier.
5. The power supply circuit according to claim 2, wherein the signal setting unit includes: the power supply comprises a fourth resistor, a fifth resistor, a second adjustable resistor, a second operational amplifier, a third operational amplifier, a diode, a sixth resistor and a second power supply; wherein,
an emitter of the photoelectric isolation unit is respectively connected with a non-inverting input end of the second operational amplifier and one end of the fourth resistor, and a collector of the photoelectric isolation unit is connected with a positive pin of the second operational amplifier;
the other end of the fourth resistor is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with the negative input end of the second operational amplifier;
the output end of the second operational amplifier is connected with the positive input end of the third operational amplifier, the positive pin of the second operational amplifier is connected with the second power supply, the negative pin of the second operational amplifier is connected with the other end of the fourth resistor, and the negative pin of the second operational amplifier is grounded;
one end of the second adjustable resistor is connected with the inverted input end of the second operational amplifier, and the other end of the second adjustable resistor is connected with the output end of the second operational amplifier;
the inverting input end of the third operational amplifier is connected with the output end of the third operational amplifier, and the output end of the third operational amplifier is connected with the anode of the diode;
and the cathode of the diode is connected with one end of the sixth resistor, and the other end of the sixth resistor is connected with an output signal point.
6. The power supply circuit of claim 5, wherein the signal tuning unit further comprises: one end of the seventh resistor is connected with the collector of the photoelectric isolation unit, and the other end of the seventh resistor is connected with the anode pin of the second operational amplifier.
7. The power supply circuit according to claim 5, wherein the signal protection unit comprises: the eighth resistor, the ninth resistor, the tenth resistor and the reference voltage source; wherein,
one end of the eighth resistor is connected with the cathode of the diode, and the other end of the eighth resistor is connected with the output end of the reference voltage source;
one end of the ninth resistor is connected with the output end of the reference voltage source, and the other end of the ninth resistor is connected with the reference end of the reference voltage source;
one end of the tenth resistor is connected with the reference end of the reference voltage source, and the other end of the tenth resistor is connected with the grounding end of the reference voltage source;
and the grounding end of the reference voltage source is grounded.
8. The power supply circuit according to claim 7, wherein the signal protection unit further comprises: and one polar plate of the third capacitor is connected with the reference end of the reference voltage source, and the other polar plate of the third capacitor is connected with the grounding end of the reference voltage source.
9. The power supply circuit of claim 7, further comprising: an output voltage control unit including: the fourth operational amplifier, the eleventh resistor, the twelfth resistor, the output voltage monitor and the second power supply source; wherein,
the negative phase input end of the fourth operational amplifier is connected with the negative electrode of the diode, the non-negative phase input end of the fourth operational amplifier is connected with the grounding end of the reference voltage source, the positive pin of the fourth operational amplifier is connected with the second power supply, and the output end of the fourth operational amplifier outputs a control signal;
one end of the eleventh resistor is connected with the non-inverting input end of the fourth operational amplifier, and the other end of the eleventh resistor is connected with the output voltage monitor;
one end of the twelfth resistor is connected with the non-inverting input end of the fourth operational amplifier, and the other end of the twelfth resistor is connected with the negative pin of the fourth operational amplifier;
or,
the non-inverting input end of the fourth operational amplifier is connected with the cathode of the diode, the inverting input end of the fourth operational amplifier is connected with the grounding end of the reference voltage source, the positive pin of the fourth operational amplifier is connected with the second power supply, and the output end of the fourth operational amplifier outputs a control signal;
one end of the eleventh resistor is connected with the inverted input end of the fourth operational amplifier, and the other end of the eleventh resistor is connected with the output voltage monitor;
one end of the twelfth resistor is connected with the inverting input end of the fourth operational amplifier, and the other end of the twelfth resistor is connected with the negative pin of the fourth operational amplifier.
10. The power supply circuit of claim 7, further comprising: an output voltage control unit including: the fourth operational amplifier, the eleventh resistor, the twelfth resistor, the output voltage monitor and the third power supply source; wherein,
the negative phase input end of the fourth operational amplifier is connected with the negative electrode of the diode, the non-negative phase input end of the fourth operational amplifier is connected with the grounding end of the reference voltage source, the positive pin of the fourth operational amplifier is connected with the third power supply, and the output end of the fourth operational amplifier outputs a control signal;
one end of the eleventh resistor is connected with the non-inverting input end of the fourth operational amplifier, and the other end of the eleventh resistor is connected with the output voltage monitor;
one end of the twelfth resistor is connected with the non-inverting input end of the fourth operational amplifier, and the other end of the twelfth resistor is connected with the negative pin of the fourth operational amplifier;
or,
the non-inverting input end of the fourth operational amplifier is connected with the cathode of the diode, the inverting input end of the fourth operational amplifier is connected with the grounding end of the reference voltage source, the positive pin of the fourth operational amplifier is connected with the third power supply, and the output end of the fourth operational amplifier outputs a control signal;
one end of the eleventh resistor is connected with the inverted input end of the fourth operational amplifier, and the other end of the eleventh resistor is connected with the output voltage monitor;
one end of the twelfth resistor is connected with the inverting input end of the fourth operational amplifier, and the other end of the twelfth resistor is connected with the negative pin of the fourth operational amplifier.
CN201720244249.6U 2017-03-13 2017-03-13 A kind of power circuit for isolating Serial regulation output Active CN206532171U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109991452A (en) * 2017-12-29 2019-07-09 中国核动力研究设计院 A kind of current signal source for realizing random waveform output in most order magnitude ranges

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109991452A (en) * 2017-12-29 2019-07-09 中国核动力研究设计院 A kind of current signal source for realizing random waveform output in most order magnitude ranges
CN109991452B (en) * 2017-12-29 2021-07-20 中国核动力研究设计院 Current signal source capable of realizing arbitrary waveform output in multi-magnitude range

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