CN216819392U - Direct current supply circuit and ultrasonic probe - Google Patents
Direct current supply circuit and ultrasonic probe Download PDFInfo
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- CN216819392U CN216819392U CN202122175244.1U CN202122175244U CN216819392U CN 216819392 U CN216819392 U CN 216819392U CN 202122175244 U CN202122175244 U CN 202122175244U CN 216819392 U CN216819392 U CN 216819392U
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Abstract
The utility model discloses a direct current power supply circuit and an ultrasonic probe, wherein the direct current power supply circuit comprises: the power supply comprises a power supply chip, a feedback circuit and a control device, wherein the input end of the power supply chip is connected with a power supply, the input end of the feedback circuit is connected with the output end of the power supply chip to obtain the voltage value of a current signal output by the power supply chip, and the output end of the feedback circuit is connected with a feedback pin of the power supply chip; the feedback circuit comprises a resistive device and an operational amplification device, wherein the resistive device is connected with the operational amplification device in series; the control device is connected with a control pin of the operational amplification device, and the control device changes the voltage at the output end of the operational amplification device by inputting a control signal to the control pin so as to control the voltage at the feedback pin. The voltage change at the feedback pin causes the reference voltage of the power chip to change, thereby controlling the output of the power chip. Therefore, the technical scheme provided by the utility model can be used for adjusting the voltage value output by the power supply chip more conveniently.
Description
Technical Field
The utility model relates to the technical field of electronics, in particular to a direct-current power supply circuit and an ultrasonic probe.
Background
With the development of production technology, the requirement of the industry for the accuracy of the equipment is higher and higher, and during the production process, the voltage of the production equipment needs to be changed continuously to meet the production requirement, for example: when the ultrasonic probe is driven, the voltage of the probe needs to be changed to realize the aim of calibrating the probe. Generally, the voltage of the device is controlled by a power chip in the dc power supply circuit. In order to adjust the voltage value of the equipment, a resistor is connected into an output circuit of the power supply chip, and the purpose of adjusting the output voltage of the power supply chip is achieved by adjusting the resistance value of the resistor. In actual development, once the resistance value of the resistor is determined, the voltage output by the power supply chip cannot be changed again, and the replacement of the resistor with different resistance values requires the disassembly of equipment, so that the operation is inconvenient, a large amount of time is required, and the production efficiency is reduced.
Therefore, how to more conveniently adjust the voltage value output by the power supply chip is an urgent problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a direct current power supply circuit which is used for adjusting the voltage value output by a power supply chip more conveniently.
To solve the above technical problem, the present invention provides a dc power supply circuit, including: the power supply comprises a power supply chip 1, a feedback circuit 2 and a control device 3, wherein the input end of the power supply chip 1 is connected with a power supply 4, one end of the feedback circuit 2 is connected with the output end of the power supply chip 1, and the other end of the feedback circuit is connected with a feedback pin of the power supply chip 1;
the feedback circuit 2 comprises a resistive device 5 and an operational amplification device 6, wherein the resistive device 5 is connected with the operational amplification device 6 in series;
the control device 3 is connected with a control pin of the operational amplifier 6 and is used for inputting a control signal to the control pin;
the control device 3 controls the voltage at the output end of the operational amplifier 6 by controlling the voltage at the control pin, so as to control the voltage at two ends of the resistive device 5 and the voltage at the feedback pin, and adjust the output voltage of the power chip 1.
Preferably, the resistive device 5 includes a first resistor and a second resistor, the first resistor and the second resistor are connected in series with the operational amplifier 6, and the first resistor is connected to the feedback pin and is configured to obtain a voltage across the first resistor.
Preferably, the operational amplifier 6 is an operational amplifier chip.
Preferably, a first filter circuit 7 is further included;
the first filter circuit 7 is connected to the input terminal of the power chip 1 and the power supply 4, and is configured to filter an alternating current signal included in a current signal input to the power chip 1.
Preferably, a second filter circuit 8 is further included;
the second filter circuit 8 is connected to the output end of the power chip 1, and is configured to filter an alternating current signal included in a current signal output by the power chip 1.
Preferably, the control device 3 is an embedded single chip microcomputer;
and an output pin of the embedded single chip microcomputer is connected with an input end of the operational amplification device 6.
Preferably, a protection circuit 9 is further included;
the protection circuit 9 is connected with the output end of the power chip 1 and is connected with the second filter circuit 8 in parallel.
Preferably, the protection circuit 9 is a schottky diode protection circuit;
and the cathode of the Schottky diode is connected with the output end of the power supply chip 1.
Preferably, the device further comprises a third resistor;
and the third resistor is connected with an RT pin of the power chip 1 and is used for adjusting the oscillation frequency of the chip.
In order to solve the technical problem, the utility model further provides an ultrasonic probe which comprises the direct current power supply circuit.
The utility model provides a direct current power supply circuit, comprising: the power supply comprises a power supply chip, a feedback circuit and a control device, wherein the input end of the power supply chip is connected with a power supply, the input end of the feedback circuit is connected with the output end of the power supply chip to obtain the voltage value of a current signal output by the power supply chip, and the output end of the feedback circuit is connected with a feedback pin of the power supply chip; the feedback circuit comprises a resistive device and an operational amplification device, wherein the resistive device is connected with the operational amplification device in series; the control device is connected with a control pin of the operational amplification device, the control device changes the voltage at the output end of the operational amplification device by inputting a control signal to the control pin, namely, adjusting the voltage at the control pin, so as to change the voltage at two ends of the resistive device, and the voltage at the feedback pin is related to the voltage at the resistive device, so that the voltage at the feedback pin is also changed along with the control of the control device. The voltage change at the feedback pin causes the reference voltage of the power chip to change, and the output of the power chip changes with the reference voltage when the voltage input to the power chip is constant. Therefore, by adopting the technical scheme provided by the utility model, the voltage value output by the power supply chip can be more conveniently adjusted by adjusting the voltage value at the input end of the operational amplification device.
In addition, the ultrasonic probe provided by the application comprises the direct current power supply circuit, and the effect is the same as above.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings required for the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained by those skilled in the art without inventive effort.
Fig. 1 is a dc power supply circuit provided in an embodiment of the present application;
fig. 2 is another dc power supply circuit provided in an embodiment of the present application;
the reference numbers are as follows: the circuit comprises a power supply chip 1, a feedback circuit 2, a control device 3, a power supply 4, a resistive device 5, an operational amplifier 6, a first filter circuit 7, a second filter circuit 8 and a protection circuit 9.
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 obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
The core of the utility model is to provide a direct current power supply circuit and an ultrasonic probe. In order that those skilled in the art will better understand the disclosure, the utility model will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a structural diagram of a dc power supply circuit according to an embodiment of the present application, and as shown in fig. 1, the dc power supply circuit includes: the power supply comprises a power supply chip 1, a feedback circuit 2 and a control device 3, wherein the input end of the power supply chip 1 is connected with a power supply 4, one end of the feedback circuit 2 is connected with the output end of the power supply chip 1, and the other end of the feedback circuit 2 is connected with a feedback pin FB2 of the power supply chip 1; the feedback circuit 2 comprises a resistive device 5 and an operational amplifier 6, wherein the resistive device 5 is connected with the operational amplifier 6 in series; the control device 3 is connected with a control pin CTR _ DAC of the operational amplification device 6 and is used for inputting a control signal to the control pin CTR _ DAC; the control device 3 controls the voltage at the output terminal of the operational amplifier 6 by controlling the voltage at the control pin CTR _ DAC, thereby controlling the voltage across the resistive device 5 and the voltage at the feedback pin FB 2.
The input end of the direct current supply circuit is connected with the power supply 4, the output end of the direct current supply circuit is connected with a load, the direct current supply circuit is used for supplying power to equipment, boosting and voltage reducing operations are carried out through the power supply chip 1, and more suitable and more stable voltage can be provided for the equipment through the direct current supply circuit.
The Power supply chip 1 includes three voltage stabilization chips, a Low Drop Out Regulator (LDO), a dc conversion Power supply chip, a Power Management Unit (PMU), and the like, and in this application, the Power supply chip is mainly used to adjust the dc voltage, so as to implement dc Power supply, and thus the dc conversion Power supply chip is selected for use. The dc conversion power supply chip includes a BUCK power supply chip for reducing voltage and a BOOST power supply chip for increasing voltage, and an appropriate chip may be selected according to actual conditions, which is not limited herein.
The voltage output by the power supply chip mentioned in the embodiment is determined by the reference voltage and the input voltage, and when the input voltage of the power supply chip is not changed, the purpose of changing the output voltage of the power supply chip can be realized by changing the reference voltage. It should be noted that when the voltage at the feedback pin FB2 of the power chip 1 is changed, the reference voltage of the power chip 1 is also changed.
In a specific implementation, the feedback circuit 2 includes a resistive device 5 and an operational amplifier 6, where the resistive device 5 may be a single resistor, a combination of multiple resistors, or other devices that can implement a voltage division function. The operational amplifier 6 may be an operational amplifier chip or a single operational amplifier device. The input end of the feedback circuit 2 is connected with the output end of the power chip 1, the other end of the feedback circuit 2 is connected with the feedback pin FB2 of the power chip 1, the connection point of the feedback circuit 2 and the feedback pin FB2 of the power chip 1 can be located between the operational amplifier 6 and the resistive device 5, or located at other positions in the feedback circuit 2, it is only required to ensure that the voltage at the feedback pin FB2 changes along with the change of the voltage at the output end of the operational amplifier 6, and the position of the connection point of the feedback circuit 2 and the feedback pin FB2 is not limited.
It can be understood that the control device 3 may be an embedded single chip microcomputer or other devices capable of outputting high and low levels, and the control device 3 may be separately provided or may use an electronic control unit provided in the apparatus, so as to achieve the purpose of saving cost. The control device 3 is connected with a control pin CTR _ DAC of the operational amplifier device 6, the control device 3 changes the voltage at the control pin CTR _ DAC of the operational amplifier device 6, and further changes the voltage at the output end of the operational amplifier device 6, and since the voltage at one end of a loop where the operational amplifier device 6 and the resistive device 5 are located is fixed, the divided voltage of the resistive device 5 at the moment changes, that is, the voltage at the feedback pin FB2 of the power chip 1 changes, so that the reference voltage of the power chip 1 is changed, and the purpose of controlling the output voltage of the power chip 1 is achieved.
It should be noted that the dc power supply circuit further includes a filter circuit protection circuit 9 and an oscillator circuit, and the filter circuit is configured to filter an ac signal mixed in the dc signal; the protection circuit 9 is used for protecting the power supply 4 when the load equipment fails; the oscillating circuit is used for adjusting the working frequency of the power supply chip 1.
The present embodiment provides a dc power supply circuit, including: the power supply comprises a power supply chip, a feedback circuit and a control device, wherein the input end of the power supply chip is connected with a power supply, the input end of the feedback circuit is connected with the output end of the power supply chip to obtain the voltage value of a current signal output by the power supply chip, and the output end of the feedback circuit is connected with a feedback pin FB2 of the power supply chip; the feedback circuit comprises a resistive device and an operational amplification device, wherein the resistive device is connected with the operational amplification device in series; the control device is connected with a control pin CTR _ DAC of the operational amplification device, the control device controls the voltage at the control pin CTR _ DAC by inputting a control signal to the control pin CTR _ DAC, the voltage at the output end of the operational amplification device is changed, and therefore the voltage at two ends of the resistive device is changed, and the voltage at the feedback pin FB2 is also changed along with the control of the control device because the voltage at the feedback pin FB2 is related to the voltage at the resistive device. The voltage change at the feedback pin FB2 causes the reference voltage of the power chip to change, and the output of the power chip changes with the reference voltage when the voltage input to the power chip is constant. Therefore, by adopting the technical scheme provided by the utility model, the voltage value output by the power supply chip can be more conveniently adjusted by adjusting the voltage value at the input end of the operational amplification device.
In a specific implementation, the output terminal of the feedback circuit 2 is connected to the feedback pin FB2 of the power chip 1, so that the voltage at the feedback pin FB2 changes with the voltage at the output terminal of the operational amplifier 6. The resistive device 5 in the feedback circuit 2 is connected in series with the operational amplifier 6, and the resistive device 5 has a voltage division function. When the potential difference between the input terminal of the feedback circuit 2 and the output terminal of the operational amplifier 6 changes, the resistive device 5 can make the voltage at the feedback pin FB2 change along with the change of the potential difference. The feedback pin FB2 may be connected between the resistive device 5 and the output of the operational amplifier 6, where the voltage at the feedback pin FB2 is the voltage at the output end of the operational amplifier 6, and when the voltage at the control pin CTR _ DAC of the operational amplifier 6 is adjusted, the voltage at the output end of the operational amplifier 6 and the voltage at the feedback pin FB2 also change, so as to achieve the purpose of adjusting the output of the power chip 1; the feedback pin FB2 may also be connected between multiple resistive devices 5 to protect the chip.
Fig. 2 is another dc power supply circuit provided in an embodiment of the present application, and as shown in fig. 2, on the basis of the foregoing embodiment, the resistive device 5 includes a first resistor R1 and a second resistor R2, the first resistor R1 and the second resistor R2 are connected in series with the operational amplifier 6, and the first resistor R1 is connected to the feedback pin FB2, and is used for obtaining a voltage across the first resistor R1.
It should be noted that the resistive device 5 includes a first resistor R1 and a second resistor R2, a connection point of the feedback pin FB2 and the first resistor R1 is located between the first resistor R1 and the second resistor R2, and a sum of a voltage at an input end of the operational amplifier 6 and a voltage obtained by dividing the second resistor R2 is a voltage at the feedback pin FB 2. The first resistor R1 is connected between the feedback pin FB2 and the input end of the feedback circuit 2, so that the voltage at the feedback pin FB2 cannot be fixed by the voltage at the input end, the second resistor R2 is connected between the feedback pin FB2 and the operational amplification device 6, and when the operational amplification device 6 fails, the voltage at the feedback pin FB2 cannot be instantly pulled high or low, so that the power chip 1 is protected. It can be understood that the present solution does not limit the resistance of the first resistor R1 and the resistance of the second resistor R2, and the user can select a suitable resistor according to the actual needs of the circuit.
In this embodiment, a connection point between the feedback pin and the first resistor is located between the first resistor and the second resistor, that is, the first resistor is connected between the feedback pin and the input end of the feedback circuit, and the second resistor is connected between the feedback pin and the operational amplifier, so that the voltage at the feedback pin is not instantly pulled up due to the influence of the operational amplifier, thereby protecting the power chip.
The operational amplification device comprises a single operational amplifier device and an operational amplifier chip, the operational amplifier chip comprises a plurality of operational amplification devices, in specific implementation, the direct-current power supply circuit provided by the application is generally used for supplying power for a plurality of devices or modules, the operational amplifier chip integrating a plurality of operational amplification devices can meet the requirements of a plurality of circuits at the same time, the structure of the power supply circuit is simpler, and the cost is reduced.
On the basis of the above embodiment, the operational amplifier 6 is an operational amplifier chip. The operational amplifier chip comprises a low-power operational amplifier, a high-impedance operational amplifier, a precision operational amplifier and the like, wherein the low-power operational amplifier refers to an operational amplifier powered by low power supply voltage and low power consumption and is commonly used for portable instruments, and a commonly used low-power operational amplifier device comprises: LM324, LM 358. The high impedance operational amplifier has high input impedance, low input bias current, and has the advantages of high speed, wide band and low noise, but the input offset voltage is large, and the commonly used high impedance operational amplifier device comprises: TL082, TL074 and CA 3140. The open-loop amplification factor of accurate fortune is put is bigger, and offset voltage or offset current ratio are less, and temperature drift is little, and the noise is low, and the performance that accurate fortune was put is stronger than ordinary fortune often far away and puts, and the wide application in fields such as medical electron, measuring instrument, automotive electronics, industrial automation equipment, accurate fortune commonly used put the device and include: OP07, OP27, ICL 7650. It can be understood that the operational amplifier chip is used for regulating the voltage in the embodiment, and the type of the operational amplifier chip is not limited.
In this embodiment, the operational amplifier chip is selected as the operational amplifier, so that the operational amplifier chip is shared by a plurality of circuit structures, a single circuit structure is simpler, and the maintenance cost is reduced. And when one operational amplifier fails, the other operational amplifier can be switched to in a short time, so that the maintenance efficiency is improved.
In the specific implementation, the power chip 1 is connected with the external power supply 4, the power chip 1 in the application is a direct current device, and when a current signal transmitted by the external power supply 4 contains an alternating current signal, the power chip 1 can be damaged.
On the basis of the above embodiment, the dc supply circuit further includes a first filter circuit 7;
the first filter circuit 7 is connected to the input terminal of the power chip 1 and the power source 4, and is configured to filter an alternating current signal included in a current signal input to the power chip 1.
The first filter circuit 7 is located between the external power supply 4 and the power supply chip 1, is grounded through a capacitor, and is used for filtering alternating current signals contained in current signals input to the power supply chip 1, so that the power supply chip 1 is protected. It can be understood that the capacitor may be an electrolyte capacitor, a paper capacitor, a film capacitor, a ceramic capacitor, a mica capacitor, an air capacitor, or a combination of different capacitors, in this embodiment, a combination of the electrolyte capacitor and the film capacitor is selected, the film capacitor has a self-healing function, when a short circuit is caused by a weak dielectric in a small part of the electrode, electrode metal around the short circuit part will generate melting and evaporation in a larger area due to electrostatic energy of the capacitor or short circuit current in the circuit, so that the film capacitor recovers insulation, that is, can be self-healed instantly, and can better protect the power chip 1.
In this embodiment, a first filter circuit is connected between the external power supply and the power chip to filter out an ac signal included in the current signal and protect the power chip. Meanwhile, the combination of the thin film capacitor and the electrolyte capacitor is selected in the first filter circuit, so that the filter circuit can better protect a power chip.
On the basis of the above embodiment, the dc supply circuit further includes a second filter circuit 8;
the second filter circuit 8 is connected to the output terminal of the power chip 1, and is configured to filter an ac signal included in the current signal output by the power chip 1.
In a specific implementation, due to interference of other circuits in the environment, the current signal output by the power chip 1 may include an alternating current signal, and therefore, a filter circuit is added between the output terminal of the power chip 1 and the load for protecting the load.
In this embodiment, a filter circuit is added between the output terminal of the power chip and the load, and is used for filtering an alternating current signal included in a current signal output by the power chip, so as to protect the load.
In specific implementation, the control device 3 may be an embedded single chip, or may be other devices capable of outputting high and low levels, such as a switching power supply whose output can be changed. It will be appreciated that the control means 3 may be provided separately or may be an electronic control unit provided in the apparatus for cost saving purposes. The control device 3 is connected with a control pin CTR _ DAC of the operational amplification device 6, and the voltage at the control pin CTR _ DAC of the operational amplification device 6 is changed through the control device 3, so that the purpose of controlling the output voltage of the power supply chip 1 is achieved. Compared with other level output devices, the embedded single chip microcomputer has the programmable characteristic, and the operation is simpler and more accurate.
On the basis of the above embodiment, the control device 3 of the direct current power supply circuit is an embedded single chip microcomputer;
the output pin of the embedded single chip is connected with the input end of the operational amplifier 6. It can be understood that the embedded single chip microcomputer includes an STM32 single chip microcomputer, a DSP single chip microcomputer and the like, and the type of the single chip microcomputer is not limited herein.
In this embodiment, the embedded single chip microcomputer is selected as the control device of the dc power supply circuit, so that a user can control the voltage output by the dc power supply circuit through programming, and the operation is simpler and more accurate.
In a specific implementation, the output terminal of the power chip 1 is connected to a load, and when the load fails, such as a short circuit, the voltage at the output terminal of the power chip 1 is pulled down to 0, which may damage the power chip 1, and even damage the external power source 4 for supplying power to the power chip 1.
On the basis of the above embodiment, the dc power supply circuit further includes a protection circuit 9;
the protection circuit 9 is connected with the output end of the power supply chip 1 and is connected with the second filter circuit 8 in parallel. The current protection circuit includes: a timing overcurrent protection circuit, an inverse time limit overcurrent protection circuit, an overcurrent and quick-break protection circuit, a differential protection circuit and the like.
In this embodiment, through connect protection circuit at power chip's output, avoid when load fault because the transient current is too big the condition that leads to power chip and external power supply to damage to appear, protection power chip and external power supply.
When a load fails, a large instantaneous current may be generated in the power supply circuit, so that the power chip 1 and the external power supply 4 are damaged, and an overcurrent and quick-break protection circuit is connected into the power supply circuit to play a role in protecting the circuit and devices.
On the basis of the above embodiment, the protection circuit 9 is a schottky diode protection circuit 9; the cathode of the Schottky diode D1 is connected with the output end of the power chip 1, the anode of the Schottky diode D1 is grounded, and when the load is in short circuit, the Schottky diode D1 can ensure that the voltage at the output end of the power chip 1 is not 0, so that the power chip 1 and the external power supply 4 are protected.
In the embodiment, the Schottky diode protection circuit is selected to protect the power chip and the external power supply, so that the circuit cost is reduced, and the complexity of the power supply circuit is not additionally increased.
On the basis of the above embodiment, the dc power supply circuit further includes a third resistor R3;
the third resistor R3 is connected to the RT pin of the power chip 1 for adjusting the chip oscillation frequency.
The third resistor R3 is used for controlling the oscillation frequency of the chip, and the switching frequency of the chip can be adjusted by replacing the third resistor R3. The third resistor R3 in this example is selected to have a resistance of 32537fsw (Khz)-1.045。
In this embodiment, the oscillation frequency of the power supply chip is controlled by the third resistor, so that the power supply chip can better realize the function of converting current.
Finally, the present document also provides an ultrasonic probe including the above-described dc power supply circuit. In the concrete implementation, the voltage of the ultrasonic probe needs to be changed to control the ultrasonic probe to realize different functions, and the purpose of controlling the voltage of the ultrasonic probe can be realized by applying the direct-current power supply circuit provided by the application. Since the above detailed description is made for each component, the detailed description is omitted here.
The ultrasonic probe provided by the embodiment comprises a direct current power supply circuit, and the circuit comprises: the power supply comprises a power supply chip, a feedback circuit and a control device, wherein the input end of the power supply chip is connected with a power supply, the input end of the feedback circuit is connected with the output end of the power supply chip to obtain the voltage value of a current signal output by the power supply chip, and the output end of the feedback circuit is connected with a feedback pin of the power supply chip; the feedback circuit comprises a resistive device and an operational amplification device, wherein the resistive device is connected with the operational amplification device in series; the control device is connected with a control pin of the operational amplification device, the control device changes the voltage at the control pin by inputting a control signal to the control pin, namely, the voltage at the output end of the operational amplification device is changed, so that the voltage at two ends of the resistive device is changed, and the voltage at the feedback pin is also changed along with the control of the control device because the voltage at the feedback pin is related to the voltage at the resistive device. The voltage change at the feedback pin causes the reference voltage of the power chip to change, and the output of the power chip changes with the reference voltage when the voltage input to the power chip is constant. Therefore, by adopting the technical scheme provided by the utility model, the voltage value output by the power supply chip can be more conveniently adjusted by adjusting the voltage value at the input end of the operational amplification device.
The dc power supply circuit and the ultrasonic probe according to the present invention are described in detail above. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A dc power supply circuit, comprising: the power supply comprises a power supply chip (1), a feedback circuit (2) and a control device (3), wherein the input end of the power supply chip (1) is connected with a power supply (4), one end of the feedback circuit (2) is connected with the output end of the power supply chip (1), and the other end of the feedback circuit is connected with a feedback pin of the power supply chip (1);
the feedback circuit (2) comprises a resistive device (5) and an operational amplification device (6), wherein the resistive device (5) is connected with the operational amplification device (6) in series;
the control device (3) is connected with a control pin of the operational amplification device (6) and is used for inputting a control signal to the control pin;
the control device (3) controls the voltage at the output end of the operational amplification device (6) by controlling the voltage at the control pin, so that the voltage at two ends of the resistive device (5) and the voltage at the feedback pin are controlled, and the output voltage of the power supply chip (1) is adjusted.
2. The direct current supply circuit according to claim 1, characterized in that said resistive device (5) comprises a first resistor and a second resistor, said first resistor and said second resistor being connected in series with said operational amplification means (6), and said first resistor being connected to said feedback pin for obtaining a voltage across said first resistor.
3. The dc supply circuit according to claim 2, wherein the operational amplifier (6) is an operational amplifier chip.
4. A direct current supply circuit according to claim 3, characterized by further comprising a first filter circuit (7);
the first filter circuit (7) is connected with the input end of the power supply chip (1) and the power supply (4) and is used for filtering alternating current signals contained in current signals input into the power supply chip (1).
5. The direct current supply circuit according to claim 4, characterized in that it further comprises a second filtering circuit (8);
the second filter circuit (8) is connected with the output end of the power supply chip (1) and is used for filtering alternating current signals contained in current signals output by the power supply chip (1).
6. The direct current supply circuit according to claim 5, wherein the control device (3) is an embedded single chip microcomputer;
and an output pin of the embedded single chip microcomputer is connected with an input end of the operational amplification device (6).
7. The direct current supply circuit according to claim 5 or 6, characterized by further comprising a protection circuit (9);
the protection circuit (9) is connected with the output end of the power supply chip (1) and is connected with the second filter circuit (8) in parallel.
8. The dc supply circuit according to claim 7, wherein the protection circuit (9) is a schottky diode protection circuit;
and the cathode of the Schottky diode is connected with the output end of the power supply chip (1).
9. The dc supply circuit of claim 7, further comprising a third resistor;
the third resistor is connected with an RT pin of the power supply chip (1) and used for adjusting chip oscillation frequency.
10. An ultrasonic probe characterized by comprising the direct current supply circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122175244.1U CN216819392U (en) | 2021-09-09 | 2021-09-09 | Direct current supply circuit and ultrasonic probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122175244.1U CN216819392U (en) | 2021-09-09 | 2021-09-09 | Direct current supply circuit and ultrasonic probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216819392U true CN216819392U (en) | 2022-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122175244.1U Active CN216819392U (en) | 2021-09-09 | 2021-09-09 | Direct current supply circuit and ultrasonic probe |
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|---|---|
| CN (1) | CN216819392U (en) |
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2021
- 2021-09-09 CN CN202122175244.1U patent/CN216819392U/en active Active
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