CN218767951U - Voltage-controlled constant-current pulse power supply device - Google Patents
Voltage-controlled constant-current pulse power supply device Download PDFInfo
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- CN218767951U CN218767951U CN202223241825.1U CN202223241825U CN218767951U CN 218767951 U CN218767951 U CN 218767951U CN 202223241825 U CN202223241825 U CN 202223241825U CN 218767951 U CN218767951 U CN 218767951U
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Abstract
The utility model relates to a voltage-controlled constant current pulse power supply device, it includes input regulating circuit, output drive circuit, output feedback circuit, direct current protection circuit, wherein, input regulating circuit is connected with direct current protection circuit through output drive circuit, output drive circuit's output is connected to output feedback circuit's input, and output feedback circuit's output is connected the reference point of input regulating circuit signal output and direct current protection circuit's current sampling resistance. The voltage-controlled constant-current pulse power supply device overcomes the defects that the range of the output voltage value of a pulse voltage source is limited and the output of the limit detection state changes from the input linear relation in the prior art, has simple logic structure and connection principle, is easy to integrate, has the advantages of flexible adjustment and control, strong output load capacity, wide capacitive load range, good input and output linearity and the like, and is widely applied to biomedical application.
Description
Technical Field
The utility model relates to the technical field of medical electronics, concretely relates to be applied to voltage-controlled constant current pulse power supply device of heart inspection and treatment.
Background
The medical stimulator is an important device for diagnosing heart diseases, the constant-current pulse power supply for generating and protecting stimulation energy is a core component of the medical stimulator, and the constant-current pulse power supply is widely applied to detection and diagnosis of cardiac functional departments and also applied to the fields of emergency treatment, soft tissue rehabilitation, nerve function evaluation, brain examination and the like. The range of the output voltage value of the existing pulse voltage source is limited, the impedance parameters of different physiological tissues of detected individuals have obvious difference, when the output voltage approaches the limit value of the output range, the change of a detected object has great influence on the current on a load, so that the linear relation between the output voltage and an input signal is changed, and the pulse voltage source cannot achieve the expected detection effect.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the voltage-controlled constant-current pulse power supply device overcomes the defects that the range of the output voltage value of a pulse voltage source is limited and the output of the limit detection state changes from the input linear relation in the prior art, has the advantages of simple logic structure and connection principle, easiness in integration, flexibility in adjustment and control, strong output load capacity, wide capacitive load range, good input and output linearity and the like, and is widely applicable to biomedical application.
The voltage-controlled constant-current pulse power supply device comprises an input regulating circuit for receiving pulse signal input, an output driving circuit for improving output current and eliminating cross-over distortion, an output feedback circuit for load loop constant-current input, and a direct-current protection circuit for detecting current passing through a load and identifying the working state of the device, wherein the input regulating circuit is connected with the direct-current protection circuit through the output driving circuit, the input end of the output feedback circuit is connected with the output end of the output driving circuit, and the output end of the output feedback circuit is connected with a reference point of the input regulating circuit signal output and a current sampling resistor of the direct-current protection circuit. The input regulating circuit receives unidirectional or bidirectional voltage pulse signal input, after the transconductance value of the input regulating circuit is regulated and the output driving circuit expands the current, the voltage pulse signal is transmitted to the direct current output protection circuit for overload direct current detection, and the output end of the direct current output protection circuit is used as the working output end of the pulse constant current source device. The output feedback circuit feeds back the signal output of the output driving circuit to the reference potential of the signal output of the instrument amplifier, thereby eliminating the influence of load change on the current on the load and enabling the output voltage and the input signal to form a stable linear relation.
To achieve device transconductance value adjustment, the input adjustment circuit includes an instrumentation amplifier U2 and a gain adjustment resistor R5 connected to the instrumentation amplifier U2. The linear relation between the output current and the output voltage of the pulse constant current source device is adjusted by matching the instrument amplifier U2 with the gain adjusting resistor R5, so that the transconductance value of the whole device is adjusted. The instrument amplifier U2 is powered by double power supplies and supports the input of positive and negative pulse voltage signals.
In order to improve the current output capability, the output driving circuit comprises transistor groups Q2 and Q3 for eliminating cross-over distortion, paired NPN and PNP transistors Q1 and Q4 for forming push-pull output, static current adjusting resistors R2 and R10 and a load current adjusting resistor R8. Transistors Q2 and Q3 are used to eliminate crossover distortion; the transistors Q1 and Q4 are used for forming push-pull output and improving the output capability of the instrumentation amplifier, and the transistors Q1 and Q4 use paired NPN and PNP transistors to ensure the symmetry of a bidirectional signal; r2 and R10 are used for regulating quiescent current, and the supply voltage VDD can be higher than that of an instrumentation amplifier so as to adapt to a wider load range, and the magnitude of the output current is controlled by regulating R8.
In order to eliminate the influence of load change on the current on the load, the output feedback circuit comprises a voltage follower U4, the input end of the voltage follower U4 is connected with the output of a load current adjusting resistor R8 of the output driving circuit, and the transmission end of the voltage follower U4 is connected with a reference voltage pin of an instrumentation amplifier U2 of the input adjusting circuit. A buffer formed by the sampling resistor and the general operational amplifier feeds back the signal output to a reference potential of the signal output of the instrumentation amplifier, and the feedback circuit enables the potential of the input end of the feedback resistor to be stabilized at a constant voltage value relative to the reference potential of the instrumentation amplifier, namely the current passing through the feedback resistor is a constant value; the current passing through the load loop connected in series with the feedback resistor is equal to the current passing through the feedback resistor, so that the current on the load is not influenced by the load change, and the output voltage and the input signal form a perfect linear relation, namely the current on the load end is controlled by the voltage on the input end.
In order to realize the detection of the overload direct current, the direct current protection circuit comprises a current detection amplifier U6 and a sampling resistor R9. The current signal flowing through the load is converted into a voltage signal, the current detection amplifier U6 detects weak voltage signals at two ends of the R9, the voltage signal passes through the fixed gain of the signal itself and outputs a voltage signal, and the voltage signal is used as a state signal of the constant current device. The signal can be output to a comparator and a logic device to detect whether energy exceeding a limit value is output in the load or not, and direct current output protection is realized.
The utility model relates to a voltage-controlled constant current pulse power supply device has overcome the limited and limit detection state of prior art's pulse voltage source output voltage value scope and has exported the defect that the linear relation of input changes, and its logical structure and connection principle are simple, easily integrated, and possess advantages such as regulation control is nimble, output load ability is strong, the capacitive load scope is wide, input/output is linear good, extensively is applicable to the biomedical and uses.
Drawings
The following description of the voltage-controlled constant-current pulse power supply device of the present invention is made with reference to the accompanying drawings:
FIG. 1 is a block diagram of the logic structure connection line of the present voltage-controlled constant current pulse power supply device;
FIG. 2 is a circuit diagram of the input regulating circuit of the present voltage-controlled constant current pulse power supply device;
FIG. 3 is a circuit diagram of the output driving circuit of the present voltage-controlled constant current pulse power supply device;
fig. 4 is a circuit diagram of the output feedback circuit of the present voltage-controlled constant current pulse power supply device;
fig. 5 is a circuit diagram of the dc protection circuit of the present voltage-controlled constant-current pulse power supply device; .
Detailed Description
In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the description of the present invention, it is to be understood that the terms "left", "right", "front", "back", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
The technical solution of the present invention is further described below with specific examples, but the scope of the present invention is not limited to the following examples.
Embodiment 1: as shown in fig. 1, the voltage-controlled constant-current pulse power supply device includes an input adjusting circuit for receiving a pulse signal input, an output driving circuit for boosting an output current and eliminating cross-over distortion, an output feedback circuit for constant-current input of a load loop, and a dc protection circuit for detecting a current passing through a load and identifying a device operating state, wherein the input adjusting circuit is connected with the dc protection circuit through the output driving circuit, an input end of the output feedback circuit is connected with an output end of the output driving circuit, and an output end of the output feedback circuit is connected with a reference point of a signal output of the input adjusting circuit and a current sampling resistor of the dc protection circuit. The input regulating circuit receives unidirectional or bidirectional voltage pulse signal input, after the transconductance value of the input regulating circuit is regulated and the output driving circuit expands the current, the voltage pulse signal is transmitted to the direct current output protection circuit for overload direct current detection, and the output end of the direct current output protection circuit is used as the working output end of the pulse constant current source device. The output feedback circuit feeds back the signal output of the output driving circuit to the reference potential of the signal output of the instrument amplifier, thereby eliminating the influence of load change on the current on the load and enabling the output voltage and the input signal to form a stable linear relation.
Embodiment 2: as shown in fig. 2, the input regulating circuit of the voltage-controlled constant-current pulse power supply device includes an instrumentation amplifier U2 and a gain regulating resistor R5 connected to the instrumentation amplifier U2. The device is used for realizing the adjustment of the transconductance value of the device, and the linear relation between the output current and the output voltage of the pulse constant current source device is adjusted by matching the instrumentation amplifier U2 with the gain adjusting resistor R5, so that the adjustment of the transconductance value of the whole device is realized. The instrument amplifier U2 is powered by double power supplies and supports the input of positive and negative pulse voltage signals. The remaining structure and components are as described in embodiment 1, and the description will not be repeated.
Embodiment 3: as shown in fig. 3, the output driving circuit of the voltage-controlled constant-current pulse power supply device includes a transistor group Q2 and Q3 for eliminating cross-over distortion, a pair of NPN and PNP transistors Q1 and Q4 for forming push-pull output, a static current adjusting resistor R2 and R10, and a load current adjusting resistor R8. The transistors Q2 and Q3 are used for eliminating crossover distortion; the transistors Q1 and Q4 are used for forming push-pull output and improving the output capability of the instrumentation amplifier, and the transistors Q1 and Q4 use paired NPN and PNP transistors to ensure the symmetry of a bidirectional signal; r2 and R10 are used for regulating quiescent current, and the supply voltage VDD can be higher than an instrumentation amplifier so as to adapt to a wider load range, and the magnitude of the output current is controlled by regulating R8. The remaining structure and components are as described in embodiment mode 1, and the description is not repeated.
Embodiment 4: as shown in fig. 4, the output feedback circuit of the voltage-controlled constant-current pulse power supply device includes a voltage follower U4, an input end of the voltage follower U4 is connected to an output of a load current adjusting resistor R8 of the output driving circuit, and an input end of the voltage follower U4 is connected to a reference voltage pin of an instrumentation amplifier U2 of the input adjusting circuit. The buffer is used for eliminating the influence of load change on the current on the load, the buffer is formed by the sampling resistor and the universal operational amplifier, the signal output is fed back to the reference potential of the signal output of the instrumentation amplifier, and the feedback circuit enables the potential of the input end of the feedback resistor to be stabilized at a constant voltage value relative to the reference potential of the instrumentation amplifier, namely the current passing through the feedback resistor is a constant value; the current passing through the load loop connected in series with the feedback resistor is equal to the current passing through the feedback resistor, so that the current on the load is not influenced by the load change, and the output voltage and the input signal form a perfect linear relation, namely the current on the load end is controlled by the voltage on the input end. The remaining structure and components are as described in embodiment 1, and the description will not be repeated.
Embodiment 5: as shown in fig. 5, the dc protection circuit of the voltage-controlled constant-current pulse power supply device includes a current detection amplifier U6 and a sampling resistor R9. The current detection amplifier U6 detects weak voltage signals at two ends of the R9, the signals pass through the fixed gain of the signal detection amplifier U6 and output a voltage signal, and the voltage signal is a state signal serving as the constant current device. The signal can be output to a comparator and a logic device to detect whether energy exceeding a limit value is output in the load or not, and direct current output protection is realized. The remaining structure and components are as described in embodiment 1, and the description will not be repeated.
The voltage-controlled constant-current pulse power supply device overcomes the defects that the range of the output voltage value of a pulse voltage source is limited and the output of the limit detection state changes from the input linear relation in the prior art, has simple logic structure and connection principle, is easy to integrate, has the advantages of flexible adjustment and control, strong output load capacity, wide capacitive load range, good input and output linearity and the like, and is widely applied to biomedical application.
The above description shows the main features, the basic principles, and the advantages of the invention. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments or examples, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The foregoing embodiments or examples are therefore to be considered in all respects illustrative and not restrictive. The scope of the invention is indicated by the appended claims rather than by the foregoing description, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A voltage-controlled constant-current pulse power supply device is characterized in that: comprises an input regulating circuit for receiving pulse signal input, an output driving circuit for improving output current and eliminating cross-over distortion, an output feedback circuit for constant current input of a load loop, and a direct current protection circuit for detecting current passing through a load and identifying the working state of a device, wherein,
the input regulating circuit is connected with the direct current protection circuit through the output driving circuit, the input end of the output feedback circuit is connected with the output end of the output driving circuit, and the output end of the output feedback circuit is connected with the reference point of the signal output of the input regulating circuit and the current sampling resistor of the direct current protection circuit.
2. The voltage-controlled constant-current pulse power supply device according to claim 1, wherein: the input regulating circuit comprises an instrumentation amplifier U2 and a gain regulating resistor R5 connected to the instrumentation amplifier U2.
3. The voltage-controlled constant-current pulse power supply device according to claim 2, wherein: the output driving circuit comprises transistor groups Q2 and Q3 for eliminating cross-over distortion, paired NPN and PNP transistors Q1 and Q4 for forming push-pull output, static current adjusting resistors R2 and R10 and a load current adjusting resistor R8.
4. The voltage-controlled constant-current pulse power supply device according to claim 3, wherein: the output feedback circuit comprises a voltage follower U4, the input end of the voltage follower U4 is connected with the output of a load current adjusting resistor R8 of the output driving circuit, and the transmission end of the voltage follower U4 is connected with a reference voltage pin of an instrumentation amplifier U2 of the input adjusting circuit.
5. The voltage-controlled constant-current pulse power supply device according to claim 4, wherein: the direct current protection circuit comprises a current detection amplifier U6 and a sampling resistor R9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223241825.1U CN218767951U (en) | 2022-12-02 | 2022-12-02 | Voltage-controlled constant-current pulse power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223241825.1U CN218767951U (en) | 2022-12-02 | 2022-12-02 | Voltage-controlled constant-current pulse power supply device |
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| Publication Number | Publication Date |
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| CN218767951U true CN218767951U (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223241825.1U Active CN218767951U (en) | 2022-12-02 | 2022-12-02 | Voltage-controlled constant-current pulse power supply device |
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- 2022-12-02 CN CN202223241825.1U patent/CN218767951U/en active Active
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