CN215528849U - Constant current source resistance conversion circuit, constant current source load circuit and electronic device - Google Patents
Constant current source resistance conversion circuit, constant current source load circuit and electronic device Download PDFInfo
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- CN215528849U CN215528849U CN202121750587.XU CN202121750587U CN215528849U CN 215528849 U CN215528849 U CN 215528849U CN 202121750587 U CN202121750587 U CN 202121750587U CN 215528849 U CN215528849 U CN 215528849U
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Abstract
The utility model discloses a constant current source resistance conversion circuit, a constant current source load circuit and an electronic device, wherein the constant current source resistance conversion circuit comprises a plurality of welding pads and a plurality of resistors arranged in parallel, and each welding pad is arranged in one-to-one correspondence with each resistor; each welding pad comprises a first welding end and a second welding end which can be welded with each other, one end of each resistor is used for being connected with a load element, the other end of each resistor is connected with the corresponding first welding end, and each second welding end is used for being grounded. The constant current source resistance conversion circuit disclosed by the utility model can solve the problems that the replacement of the resistor in the existing circuit board finished product is restricted by factors such as on-site material storage, quality of replacement personnel and the like, so that the replacement process is difficult and the quality of the replaced circuit board is difficult to ensure.
Description
Technical Field
The utility model belongs to the technical field of electronics, and particularly relates to a constant current source resistance conversion circuit, a constant current source load circuit and electronic equipment.
Background
In a load circuit, in order to adapt to different current requirements of load elements, a welded circuit board finished product is required to be subjected to resistor replacement operation, the sizes and specifications of different resistors are not necessarily the same, the matched resistor which can be used for replacement cannot be found on site, along with the increasing miniaturization of the size of the circuit board, the replacement process has certain requirements on the operation level, when a replacement person is a non-professional person, the situations of poor contact or error short circuit and the like are easy to occur after replacement, and therefore hidden dangers are brought to the quality of electronic products.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above disadvantages of the prior art, the present invention aims to provide a constant current source resistance conversion circuit, which aims to solve the technical problems that the replacement of the resistance in the existing circuit board finished product is restricted by factors such as on-site material storage, quality of replacement personnel, etc., so that the replacement process is difficult and the quality of the replaced circuit board is difficult to ensure.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
a constant current source resistance conversion circuit comprises a plurality of welding pads and a plurality of resistors arranged in parallel, wherein each welding pad is arranged in one-to-one correspondence with each resistor; wherein the content of the first and second substances,
each welding pad comprises a first welding end and a second welding end which can be welded with each other, one end of each resistor is used for connecting a load element, the other end of each resistor is connected with the corresponding first welding end, and each second welding end is used for grounding.
Further, the number of pads includes five.
Further, the first welding end is made of tin plating.
Further, the second welding end is made of tin plating.
Correspondingly, the utility model also provides a constant current source load circuit, which comprises a power supply end, a load element and the constant current source resistance conversion circuit; wherein the content of the first and second substances,
one end of each resistor is electrically connected with the power supply end through the load element, and each second welding end is grounded.
Furthermore, the constant current source load circuit also comprises a control circuit, a switching element, an inductor, a diode and an energy storage capacitor; wherein the content of the first and second substances,
one end of the inductor is electrically connected with the power supply end, the other end of the inductor is electrically connected with the first end of the switching element and the anode of the diode respectively, the cathode of the diode is electrically connected with one end of the energy storage capacitor and the anode of the load element respectively, and the other end of the energy storage capacitor is grounded;
the output end of the control circuit is electrically connected with the control end of the switch element, and the second end of the switch element is grounded;
the control circuit is configured to output an on signal or an off signal to the switching element, and the switching element is configured to be turned on when receiving the on signal and is configured to be turned off when receiving the off signal.
Further, the input end of the control circuit is electrically connected with the negative electrode of the load element;
the control circuit is used for outputting the starting signal to the switch element when the output voltage of the load element reaches a first preset threshold value; and the control circuit is used for outputting the closing signal to the switch element when the output voltage of the load element reaches a second preset threshold value.
Further, the constant current source load circuit further comprises a filter capacitor, and the filter capacitor is connected in parallel to two ends of the energy storage capacitor.
Further, the switching element is a field effect transistor, a gate of the field effect transistor is a control end of the switching element, a drain of the field effect transistor is a first end of the switching element, and a source of the field effect transistor is a second end of the switching element.
Further, the switching element is a triode, a base of the triode is a control end of the switching element, a collector of the triode is a first end of the switching element, and an emitter of the triode is a second end of the switching element.
Correspondingly, the utility model also provides an electronic device, which comprises the constant current source load circuit.
Compared with the prior art, the utility model has the beneficial effects that:
the constant current source resistance conversion circuit provided by the utility model is provided with a plurality of welding discs which are mutually connected in parallel and are provided with a first welding end and a second welding end, and a plurality of resistors which are arranged in series corresponding to the welding discs one by one, wherein the first welding end and the second welding end of a target welding disc are electrically communicated through tin soldering, so that a resistance branch where the target welding disc is located is controlled to be conducted, and the first welding end and the second welding end which are electrically communicated are disconnected through a tin removing mode, so that the resistance branch where the target welding disc is located is controlled to be cut off.
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 following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a circuit configuration diagram of a constant current source resistance conversion circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a constant current source load circuit according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a constant current source resistance conversion circuit, which includes a plurality of pads and a plurality of resistors arranged in parallel, where each pad and each resistor are arranged in a one-to-one correspondence; wherein the content of the first and second substances,
each welding pad comprises a first welding end and a second welding end which can be welded with each other, one end of each resistor is used for connecting a load element, the other end of each resistor is connected with the corresponding first welding end, and each second welding end is used for grounding.
In the present embodiment, the number of pads and resistors can be set according to actual requirements, and illustratively, the present embodiment describes the specific implementation process based on the case where the number of pads is five (T1-T5), and correspondingly, the number of resistors is also set to five (R1-R5). In the specific implementation process, the first welding end and the second welding end are arranged at intervals in the initial state, and a worker can weld the first welding end and the second welding end of the target bonding pad by using welding tools such as electric soldering iron in a soldering mode (namely, the first welding end and the second welding end are short-circuited), so that the branch where the target bonding pad is located is switched on from cut-off, and thus, the main route can obtain a resistance value equivalent to the resistance value of all the switched-on branches. Specifically, if only the first bonding end and the second bonding end of the bonding pad T1 are shorted, only the branch circuit where the resistor R1 is located is turned on, so the resistance of the total circuit is the resistance of the resistor R1; if the first welding end and the second welding end of the pad T2 and the pad T5 are short-circuited, the branch circuits where the resistors R2 and R5 are located are turned on, so that the resistance value of the main circuit is the equivalent resistance value after the resistors R2 and R5 are connected in parallel; if the first and second bonding ends of the pad T2, the pad T3, and the pad T4 are shorted, the branch where the resistor R2, the resistor R3, and the resistor R4 are located is turned on, so the resistance value of the total path is the equivalent resistance value after the resistor R2, the resistor R3, and the resistor R4 are connected in parallel. In specific operation, the resistances of the resistors R1-R5 can be set as required, and when the resistances of the resistors R1-R5 are different, the number of equivalent resistors available in the main circuit can be maximized (31 types). If the first welding end and the second welding end which are welded are required to be disconnected, soldering tin at the connecting part is sucked by using a tin sucking tool, or the connecting part is separated by using a welding tool such as an electric soldering iron.
Of course, in other embodiments, the first welding end and the second welding end may also be set in a short circuit state (i.e., welded together) in the initial state, and the worker may disconnect the first welding end and the second welding end of the target pad as required to stop the branch circuit.
Therefore, the constant current source resistance conversion circuit provided by the embodiment is provided with a plurality of pads which are connected in parallel and have a first welding end and a second welding end, and a plurality of resistors which are connected in series in one-to-one correspondence with the pads, the first welding end and the second welding end of a target pad are electrically communicated through tin soldering, so that a resistance branch circuit at the target pad is controlled to be switched on, the first welding end and the second welding end which are electrically communicated are disconnected through a tin removing mode, the resistance branch circuit at the target pad is controlled to be switched off, and therefore the resistance branch circuits are switched on or switched off through different resistance branch circuits.
Further, in an exemplary embodiment, the first soldering terminal is made of tin plating.
Further, in an exemplary embodiment, the second soldering terminal is made of tin plating.
In the two embodiments, the tin plating is attached to the first welding end and the second welding end in a coating mode, and the tin plating layer can be melted by a welding tool such as an electric soldering iron during welding to directly weld without the help of tin soldering, so that the welding process is simplified, and the welding operation difficulty is reduced.
Correspondingly, referring to fig. 1 and fig. 2, an embodiment of the present invention further provides a constant current source load circuit, which includes a power supply terminal VCC, a load element, and the constant current source resistance converting circuit in any of the above embodiments; wherein the content of the first and second substances,
one end of each resistor is electrically connected with a power supply end VCC through a load element, and each second welding end is grounded.
In this embodiment, thanks to the improvement of the constant current source resistance conversion circuit provided by the above embodiment, the constant current source load circuit provided by this embodiment has the same technical effect as the constant current source resistance conversion circuit described above (by controlling the connection or disconnection between the first bonding terminal and the second bonding terminal of the target bonding pad, and further controlling the conduction or disconnection of the resistance branch where the target bonding pad is located, so that the conversion of various resistance values is realized without replacing the resistance, and the current value output from the VCC to the load element can be controlled according to actual needs), wherein the load element may include an LED driver, etc. For the description of the specific implementation process, reference may be made to the above embodiments, which are not described herein again.
Further, referring to fig. 2, in an exemplary embodiment, the constant current source load circuit further includes a control circuit U1, a switching element Q1, an inductor L1, a diode D1, and an energy storage capacitor C6; wherein the content of the first and second substances,
one end of an inductor L1 is electrically connected with a power supply terminal VCC, the other end of the inductor L1 is electrically connected with the first end of a switching element Q1 and the anode of a diode D1 respectively, the cathode of the diode D1 is electrically connected with one end of an energy storage capacitor C6 and the anode of a load element Q1 respectively, and the other end of the energy storage capacitor C6 is grounded;
the output end OUT of the control circuit U1 is electrically connected to the control end of the switching element Q1, and the second end of the switching element Q1 is grounded;
the control circuit U1 is for outputting an on signal or an off signal to the switching element Q1, and the switching element Q1 is for turning on when receiving the on signal and for turning off when receiving the off signal.
In the present embodiment, the switching element Q1, the inductor L1, the diode D1 and the energy storage capacitor C6 form a complete boost circuit, which is divided into two operation states of charging and discharging. In the charging process, the switching element Q1 is turned on, the power supply terminal VCC is turned on through the branch from the switching element Q1 to the ground terminal, the input voltage of the power supply terminal VCC flows through the inductor L1, so that the current on the inductor L1 linearly increases at a certain rate, and at this time, the load element is powered by the discharge of the energy storage capacitor C6 which already stores a certain amount of electric energy, wherein the diode D1 can prevent the energy storage capacitor C6 from discharging to the ground, and some energy is gradually stored in the inductor L1 with the increase of the current of the inductor L1; when the energy stored in the inductor L1 reaches a predetermined requirement, the switching element Q1 is turned off, and at this time, the boost circuit is switched to a discharge state, and due to the current holding characteristic of the inductor L1, the current flowing through the inductor L1 slowly changes from the value at the time of completion of charging to zero, and a back electromotive force is generated at both ends of the inductor L1, and is superimposed with the input voltage of the power supply terminal VCC to supply power to the load element and charge the energy storage capacitor C6, and since the superimposed voltage is already higher than the input voltage of the power supply terminal VCC, the boosting is completed. The control circuit U1 may be a hardware circuit including control elements such as an automatic control chip, and the output of the on signal and the off signal may be controlled manually or automatically through a preset program, and only the on/off of the switching element Q1 needs to be controlled through signal transmission, which is not limited herein.
Therefore, the voltage boosting circuit provided by the embodiment can improve the voltage output to two ends of the load element through the boosting action, so that the voltage requirement of the load element is better met.
Further, referring to fig. 2, in an exemplary embodiment, the input terminal INN of the control circuit is electrically connected to the negative pole of the load element;
the control circuit U1 is configured to output an on signal to the switching element Q1 when the output voltage of the load element reaches a first preset threshold; and the control circuit U1 is configured to output a turn-off signal to the switching element Q1 when the output voltage of the load element reaches a second predetermined threshold.
In this embodiment, the control circuit U1 samples the output voltage of the load element, and controls the on-time of the switching element Q1 by comparing the sampled voltage with the first preset threshold and the second preset threshold, so as to control the stored energy of the inductor L1 and the energy output to the energy storage capacitor C6, and after multiple on/off adjustments of the switching element Q1, the circuit is in a dynamic balance state, thereby achieving a constant current effect.
Further, referring to fig. 2, in an exemplary embodiment, the constant current source load circuit further includes a filter capacitor C8, and the filter capacitor C8 is connected in parallel to two ends of the energy storage capacitor C6.
In this embodiment, illustratively, after passing through the diode D1, the electrical signal output from the power supply terminal VCC first passes through the filter capacitor C8 to filter a part of the high frequency signal therein, and then goes to the energy storage capacitor C6 for storing electrical energy, thereby achieving the filtering effect.
Further, referring to fig. 2, in an exemplary embodiment, the switching element Q1 is a fet, a gate of the fet is a control terminal of the switching element Q1, a drain of the fet is a first terminal of the switching element Q1, and a source of the fet is a second terminal of the switching element Q1.
In this embodiment, the fet may be an MOS transistor, and specifically, when the control circuit U1 outputs a high level to the gate of the MOS transistor, the MOS transistor is in a conducting state based on its characteristics, and at this time, the power supply terminal VCC is conducted through a branch from the MOS transistor to the ground terminal; when the control circuit U1 outputs a low level to the gate of the MOS transistor, the MOS transistor is in an off state based on its characteristics, and the power supply terminal VCC is not turned on through the branch from the MOS transistor to the ground terminal.
Further, in an exemplary embodiment, the switching element Q1 is a transistor, a base of the transistor is a control terminal of the switching element Q1, a collector of the transistor is a first terminal of the switching element Q1, and an emitter of the transistor is a second terminal of the switching element Q1.
In this embodiment, specifically, when the control circuit U1 outputs a high level to the base of the transistor, the emitter and the collector of the transistor are in a forward bias state, at this time, the transistor is equivalent to a switch in a closed state, and the power supply terminal VCC is conducted through a branch from the transistor to the ground terminal; when the control circuit U1 outputs a low level to the base of the transistor, the emitter and the collector of the transistor are in a reverse bias state, the transistor is equivalent to a switch in a disconnection state, and the power supply terminal VCC is not conducted through the branch from the transistor to the ground terminal.
Correspondingly, the embodiment of the utility model also provides an electronic device, which comprises the constant current source load circuit in any one of the embodiments.
In this embodiment, thanks to the improvement of the constant current source load circuit provided in the above embodiment, the electronic device of this embodiment has the same technical effect as the constant current source load circuit, and details are not described here.
It should be noted that other contents of the constant current source resistance conversion circuit, the constant current source load circuit and the electronic device disclosed in the present invention may be referred to in the prior art, and are not described herein again.
In addition, it should be noted that the descriptions related to "first", "second", etc. in the present invention are only used for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The constant current source resistance conversion circuit is characterized by comprising a plurality of pads and a plurality of resistors arranged in parallel, wherein each pad is arranged in one-to-one correspondence with each resistor; wherein the content of the first and second substances,
each welding pad comprises a first welding end and a second welding end which can be welded with each other, one end of each resistor is used for connecting a load element, the other end of each resistor is connected with the corresponding first welding end, and each second welding end is used for grounding.
2. The constant current source resistance conversion circuit according to claim 1, wherein the number of the pads includes five.
3. The constant current source resistance conversion circuit according to claim 1, wherein the first bonding terminal is made of tin plating;
and/or the second welding end is made of tin plating.
4. A constant current source load circuit characterized in that the constant current source load circuit comprises a power source terminal, a load element, and the constant current source resistance conversion circuit according to any one of claims 1 to 3; wherein the content of the first and second substances,
one end of each resistor is electrically connected with the power supply end through the load element, and each second welding end is grounded.
5. The constant current source load circuit according to claim 4, further comprising a control circuit, a switching element, an inductance, a diode, and an energy storage capacitance; wherein the content of the first and second substances,
one end of the inductor is electrically connected with the power supply end, the other end of the inductor is electrically connected with the first end of the switching element and the anode of the diode respectively, the cathode of the diode is electrically connected with one end of the energy storage capacitor and the anode of the load element respectively, and the other end of the energy storage capacitor is grounded;
the output end of the control circuit is electrically connected with the control end of the switch element, and the second end of the switch element is grounded;
the control circuit is configured to output an on signal or an off signal to the switching element, and the switching element is configured to be turned on when receiving the on signal and is configured to be turned off when receiving the off signal.
6. The constant current source load circuit according to claim 5, wherein an input terminal of the control circuit is electrically connected to a negative electrode of the load element;
the control circuit is used for outputting the starting signal to the switch element when the output voltage of the load element reaches a first preset threshold value; and the control circuit is used for outputting the closing signal to the switch element when the output voltage of the load element reaches a second preset threshold value.
7. The constant current source load circuit according to claim 5, further comprising a filter capacitor connected in parallel across the energy storage capacitor.
8. The constant current source load circuit according to claim 5, wherein the switching element is a field effect transistor, a gate of the field effect transistor is a control terminal of the switching element, a drain of the field effect transistor is a first terminal of the switching element, and a source of the field effect transistor is a second terminal of the switching element.
9. The constant current source load circuit according to claim 5, wherein the switching element is a transistor, a base of the transistor is a control terminal of the switching element, a collector of the transistor is a first terminal of the switching element, and an emitter of the transistor is a second terminal of the switching element.
10. An electronic device characterized in that the electronic device comprises the constant current source load circuit according to any one of claims 4 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121750587.XU CN215528849U (en) | 2021-07-28 | 2021-07-28 | Constant current source resistance conversion circuit, constant current source load circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121750587.XU CN215528849U (en) | 2021-07-28 | 2021-07-28 | Constant current source resistance conversion circuit, constant current source load circuit and electronic device |
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| Publication Number | Publication Date |
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| CN215528849U true CN215528849U (en) | 2022-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121750587.XU Active CN215528849U (en) | 2021-07-28 | 2021-07-28 | Constant current source resistance conversion circuit, constant current source load circuit and electronic device |
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| CN (1) | CN215528849U (en) |
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- 2021-07-28 CN CN202121750587.XU patent/CN215528849U/en active Active
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