CN108616213B - Magnetic resonance emission front end, chip and power device driving circuit - Google Patents
Magnetic resonance emission front end, chip and power device driving circuit Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention discloses a magnetic resonance emission front end, a chip and a power device driving circuit, which comprises a frequency given unit for outputting a frequency signal, a first resistor, a second resistor, a first inverting amplifier, a JK trigger and a push-pull current amplifying circuit, wherein the output end of the frequency given unit is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, the common end of the first resistor is used as a duty ratio adjusting end and externally connected with a direct current reference voltage, the direct current reference voltage is used for changing the duty ratio of a pulse signal output by the first inverting amplifier, the second end of the second resistor is connected with the input end of the first inverting amplifier, the output end of the first inverting amplifier is connected with the trigger end of the JK trigger, the forward output end and the backward output end of the JK trigger are respectively connected with the first input end and the second input end of the push-pull current amplifying circuit in a one, the output end of the push-pull current amplifying circuit is used for outputting a driving signal. The circuit of the invention has simple structure and low cost.
Description
Technical Field
The invention relates to the technical field of magnetic resonance emission, in particular to a magnetic resonance emission front end, a chip and a power device driving circuit.
Background
With the progress of science and technology, the magnetic resonance emission front end is greatly developed. The magnetic resonance emission front end can be used for driving a power device, in the prior art, a single chip microcomputer, a comparator and other devices are generally adopted to adjust the duty ratio of a frequency signal input to a trigger end of a JK trigger in order to adjust a driving signal output to the power device, but a circuit for adjusting the duty ratio in the prior art has the defect of complex circuit structure, and when the single chip microcomputer is adopted, the problem of high cost also exists.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a magnetic resonance emission front end, which adjusts the bias voltage of a first inverting amplifier through an external direct current reference voltage so as to adjust the duty ratio of a pulse signal output by the inverting amplifier, and has the advantages of simple circuit structure and low cost; another object of the present invention is to provide a magnetic resonance transmit chip and a power device driving circuit including the magnetic resonance transmit front end.
In order to solve the above technical problem, the present invention provides a magnetic resonance transmit front end, including a frequency setting unit for outputting a frequency signal, a first resistor, a second resistor, a first inverting amplifier, a JK flip-flop, and a push-pull current amplifying circuit, wherein:
the output end of the frequency setting unit is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, the common end of the first resistor is used as a duty ratio adjusting end and externally connected with a direct current reference voltage, the direct current reference voltage is used for changing the duty ratio of a pulse signal output by the first inverting amplifier, the second end of the second resistor is connected with the input end of the first inverting amplifier, the output end of the first inverting amplifier is connected with the trigger end of the JK trigger, the forward output end and the reverse output end of the JK trigger are respectively connected with the first input end and the second input end of the push-pull current amplifying circuit in a one-to-one correspondence mode, and the output end of the push-pull current amplifying circuit is used for outputting a driving signal.
Preferably, the frequency giving unit includes a signal source and a second inverting amplifier, wherein:
the signal source is used for outputting an initial frequency signal;
the input end of the second inverting amplifier is connected with the output end of the signal source, and the output end of the second inverting amplifier is used as the output end of the frequency giving unit and used for carrying out inverting amplification and shaping processing on the initial frequency signal to obtain the frequency signal.
Preferably, the signal source is a crystal oscillator.
Preferably, the magnetic resonance transmit front end further comprises:
and the third inverting amplifier is used for performing inverting amplification and shaping processing on the pulse signal output by the first inverting amplifier, and the input end of the third inverting amplifier is connected with the output end of the first inverting amplifier, and the output end of the third inverting amplifier is connected with the trigger end of the JK trigger.
Preferably, the push-pull current amplification circuit comprises a first amplifier, a second amplifier, a first controllable switch and a second controllable switch, wherein:
the input end of the first amplifier is used as the first input end of the push-pull current amplification circuit, the output end of the first amplifier is connected with the control end of the first controllable switch, the input end of the second amplifier is used as the second input end of the push-pull current amplification circuit, the output end of the second amplifier is connected with the control end of the second controllable switch, the first end of the first controllable switch is connected with a power supply, the second end of the first controllable switch is connected with the first end of the second controllable switch, the common end of the first controllable switch is used as the output end of the push-pull current amplification circuit, and the second end of the second controllable switch is grounded.
Preferably, the first controllable switch and the second controllable switch are both NPN-type triodes.
Preferably, the first controllable switch and the second controllable switch are both NMOS.
Preferably, the first controllable switch and the second controllable switch are both IGBTs.
In order to solve the above technical problem, the present invention further provides a magnetic resonance emission front-end chip, including the magnetic resonance emission front-end as described above.
In order to solve the above technical problem, the present invention further provides a power device driving circuit, which includes a power device, and further includes the magnetic resonance emission front-end chip as described above, where the magnetic resonance emission front-end chip is used for driving the power device.
The invention provides a magnetic resonance emission front end, a chip and a power device driving circuit, which comprises a frequency given unit for outputting a frequency signal, a first resistor, a second resistor, a first inverting amplifier, a JK trigger and a push-pull current amplifying circuit, wherein the output end of the frequency given unit is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, the common end of the first resistor is used as a duty ratio adjusting end and externally connected with a direct current reference voltage, the direct current reference voltage is used for changing the duty ratio of a pulse signal output by the first inverting amplifier, the second end of the second resistor is connected with the input end of the first inverting amplifier, the output end of the first inverting amplifier is connected with the trigger end of the JK trigger, the forward output end and the backward output end of the JK trigger are respectively connected with the first input end and the second input end of the push-pull current amplifying circuit in a one-to, the output end of the push-pull current amplifying circuit is used for outputting a driving signal. Therefore, the bias voltage of the first inverting amplifier is adjusted through the external direct current reference voltage, the duty ratio of the pulse signal output by the inverting amplifier is further adjusted, and the circuit is simple in structure and low in cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a magnetic resonance transmit front end according to the present invention;
fig. 2 is a schematic structural diagram of a magnetic resonance transmit front-end chip according to the present invention;
FIG. 3 is a schematic diagram of a test of a MR transmit front-end chip according to the present invention;
FIG. 4 is a waveform diagram of the output of the 2-pin of the MR transmission front-end chip according to the present invention;
fig. 5 is a schematic structural diagram of a power device driving circuit according to the present invention;
fig. 6 is a schematic structural diagram of another power device driving circuit provided by the present invention.
Detailed Description
The core of the invention is to provide a magnetic resonance emission front end, which adjusts the bias voltage of a first inverting amplifier through an external direct current reference voltage, and further adjusts the duty ratio of a pulse signal output by the inverting amplifier, and the circuit has simple structure and low cost; another core of the present invention is to provide a magnetic resonance emission chip and a power device driving circuit including the magnetic resonance emission front end.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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, fig. 1 is a schematic structural diagram of a magnetic resonance transmit front end provided by the present invention, the front end includes a frequency setting unit 1 for outputting a frequency signal, a first resistor 2, a second resistor 3, a first inverting amplifier 4, a JK flip-flop 5, and a push-pull current amplifying circuit 6, wherein:
the output end of the frequency setting unit 1 is connected with the first end of the first resistor 2, the second end of the first resistor 2 is connected with the first end of the second resistor 3, the common end of the first resistor 2 is used as a duty ratio adjusting end and is externally connected with a direct current reference voltage, the direct current reference voltage is used for changing the duty ratio of a pulse signal output by the first inverting amplifier 4, the second end of the second resistor 3 is connected with the input end of the first inverting amplifier 4, the output end of the first inverting amplifier 4 is connected with the trigger end of the JK trigger 5, the forward output end and the reverse output end of the JK trigger 5 are respectively connected with the first input end and the second input end of the push-pull current amplifying circuit 6 in a one-to-one correspondence mode, and the output end of the push-pull.
Specifically, the frequency setting unit 1 outputs a frequency signal, the frequency signal is subjected to current limiting through the first resistor 2, then is mixed and superposed with the direct-current reference voltage (the duty ratio of the pulse signal output by the first inverting amplifier 4 is changed, the duty ratio is controlled at the moment), is subjected to current limiting through the second resistor 3, and then is output to the first inverting amplifier 4 for inversion, the pulse signal with the changed duty ratio is output, then is input to the JK trigger 5, and the JK trigger 5 simultaneously outputs two levels Q and-Q with mutually inverted potentials; when the Q output by the JK flip-flop 5 is at a high level, the output end of the push-pull current amplifying circuit 6 outputs a high level (or a low level), and the power device is driven to be closed (or the power device is turned off); when-Q output by the JK flip-flop 5 is at a high level, the output terminal of the push-pull current amplifying circuit 6 outputs a low level (or a high level), and the power device is turned off (or the power device is driven to be turned on).
The power device may be a MOSFET or an IGBT, and of course, other types of power devices may also be used, and the present invention is not particularly limited herein and is determined according to actual situations.
The principle of changing the duty ratio of the pulse signal by the first inverting amplifier 4 in the present application is described below:
specifically, the change of the duty ratio is accomplished by the first inverting amplifier 4. The first inverting amplifier 4 itself has a characteristic of changing the duty ratio:
the potential of the input terminal of the first inverting amplifier 4 is its bias voltage, and when the voltage of the input signal exceeds this bias voltage, the output of the first inverting amplifier 4 is inverted; also, when the voltage of the input signal is lower than this bias voltage, the output of the first inverting amplifier 4 is also inverted.
For example:
1. let the operating voltage of the first inverting amplifier 4 be 12V, if the bias voltage is 10V, when the input signal is less than 10V, output high level (12V), when the input signal is 10V, input low level (0V).
2. The operating voltage of the first inverting amplifier 4 is set to 12V, and if the threshold is set to 5V, when the input signal is less than 5V, a high level (12V) is output, and when the input signal is 5V, a low level (0V) is input.
The two conditions are compared to show that the same input signal has long high voltage maintaining time and large duty ratio, and the same input signal has short high level maintaining time and small duty ratio.
In summary, the duty ratio can be changed by changing the bias voltage of the first inverting amplifier 4 by applying a dc reference voltage externally.
Preferably, the frequency giving unit 1 comprises a signal source 11 and a second inverting amplifier 12, wherein:
the signal source 11 is configured to output an initial frequency signal;
the input end of the second inverting amplifier 12 is connected to the output end of the signal source 11, and the output end of the second inverting amplifier 12 is used as the output end of the frequency setting unit 1, and is used for performing inverse amplification and shaping processing on the initial frequency signal to obtain a frequency signal.
Preferably, the signal source 11 is a crystal oscillator.
Specifically, the signal source 11 may be a crystal oscillator, which generates oscillation by itself after being powered on, and generates a square wave signal with a fixed frequency, that is, an initial frequency signal.
The crystal oscillator has the advantages of strong anti-interference capability, no external influence and high precision of the output initial frequency signal.
In addition, the second inverting amplifier 12 here functions to perform amplification shaping processing on the initial frequency signal so that the initial frequency signal becomes closer to the standard square wave signal.
Preferably, the magnetic resonance transmit front end further comprises:
and the third inverting amplifier is used for carrying out inverting amplification and shaping processing on the pulse signal output by the first inverting amplifier 4, and the input end of the third inverting amplifier is connected with the output end of the first inverting amplifier 4, and the output end of the third inverting amplifier is connected with the trigger end of the JK trigger 5.
In order to make the pulse signal closer to the standard pulse signal, the invention further comprises a third inverting amplifier for performing the inverse amplification and shaping processing on the pulse signal output by the first inverting amplifier 4.
Preferably, the push-pull current amplification circuit 6 comprises a first amplifier, a second amplifier, a first controllable switch and a second controllable switch, wherein:
the input end of the first amplifier is used as the first input end of the push-pull current amplifying circuit 6, the output end of the first amplifier is connected with the control end of the first controllable switch, the input end of the second amplifier is used as the second input end of the push-pull current amplifying circuit 6, the output end of the second amplifier is connected with the control end of the second controllable switch, the first end of the first controllable switch is connected with the power supply, the second end of the first controllable switch is connected with the first end of the second controllable switch, the common end of the first controllable switch is used as the output end of the push-pull current amplifying circuit 6, and the second end of the second controllable switch is grounded. Preferably, the first controllable switch and the second controllable switch are both NPN transistors.
Preferably, the first controllable switch and the second controllable switch are both NMOS.
Preferably, the first controllable switch and the second controllable switch are both IGBTs.
Specifically, when the first controllable switch and the second controllable switch are any one of the above:
when the Q output by the JK trigger 5 is at a high level, the first controllable switch is closed, the second controllable switch is opened, the output end of the push-pull current amplifying circuit 6 outputs the high level, and the driving power device is closed; when-Q output by the JK trigger 5 is at a high level, the first controllable switch is switched off, the second controllable switch is switched on, the output end of the push-pull current amplifying circuit 6 outputs a low level, and the power device is switched off.
Of course, the first controllable switch and the second controllable switch may be other types of controllable switches, and the present invention is not limited thereto, depending on the actual situation.
The invention provides a magnetic resonance emission front end, which comprises a frequency setting unit for outputting a frequency signal, a first resistor, a second resistor, a first inverting amplifier, a JK trigger and a push-pull current amplifying circuit, wherein, the output end of the frequency setting unit is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, the common end of the JK trigger is used as a duty ratio adjusting end and is externally connected with a direct current reference voltage, the direct current reference voltage is used for changing the duty ratio of a pulse signal output by a first reverse amplifier, the second end of a second resistor is connected with the input end of the first reverse amplifier, the output end of the first reverse amplifier is connected with the trigger end of the JK trigger, the forward output end and the reverse output end of the JK trigger are respectively connected with the first input end and the second input end of a push-pull current amplifying circuit in a one-to-one correspondence mode, and the output end of the push-pull current amplifying circuit is used for outputting. Therefore, the bias voltage of the first inverting amplifier is adjusted through the external direct current reference voltage, the duty ratio of the pulse signal output by the inverting amplifier is further adjusted, and the circuit is simple in structure and low in cost.
In accordance with the foregoing, the present invention further provides a magnetic resonance transmit front-end chip, including the magnetic resonance transmit front-end as described above.
Specifically, please refer to fig. 2, fig. 3 and fig. 4, wherein fig. 2 is a schematic structural diagram of a magnetic resonance transmit front-end chip provided by the present invention, fig. 3 is a schematic test diagram of a magnetic resonance transmit front-end chip provided by the present invention, and fig. 4 is an output waveform diagram of a 2-pin of a magnetic resonance transmit front-end chip provided by the present invention.
Pin 1 is Vc, pin 2 is OUTPUT, pin 3 is Vd, pin 4 is DUTY control L, and pin 5 is GROUND.
In fig. 3, during testing, Vc and Vd can be combined to share a 9V power supply, a PWM output terminal is provided below pin 2, and the waveform is a square wave.
In addition, please refer to the above description of the mr front-end for describing the operating principle of the mr front-end chip provided by the present invention, which is not particularly limited herein and is determined according to the actual situation.
The invention also provides a power device driving circuit, which comprises a power device and the magnetic resonance emission front-end chip, wherein the magnetic resonance emission front-end chip is used for driving the power device.
Specifically, please refer to fig. 5 and fig. 6, wherein fig. 5 is a schematic structural diagram of a power device driving circuit provided by the present invention, and fig. 6 is a schematic structural diagram of another power device driving circuit provided by the present invention.
For fig. 5, the magnetic resonance transmit front end can directly drive the medium and small power IGBT, but the gate capacitance is required to be not less than 10nF, and Rg is between 5 Ω and 30 Ω.
With respect to fig. 6, the magnetic resonance emission front end can directly drive the high-power IGBT, and in order to accelerate the discharge of the IGBT, the negative voltage circuits DW and C3 are used, and the driving voltage is raised to 20V or even higher.
Of course, the power device driving circuit herein may also be in other specific circuit forms, and the invention is not limited in particular herein.
In addition, please refer to the above description of the mr front-end for describing the operating principle of the mr front-end chip provided by the present invention, which is not particularly limited herein and is determined according to the actual situation.
It is to be 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.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A magnetic resonance transmission front end is characterized by comprising a frequency setting unit for outputting a frequency signal, a first resistor, a second resistor, a first inverting amplifier, a JK trigger and a push-pull current amplifying circuit, wherein:
the output end of the frequency setting unit is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, the common end of the first resistor is used as a duty ratio adjusting end and externally connected with a direct current reference voltage, the direct current reference voltage is used for changing the duty ratio of a pulse signal output by the first inverting amplifier, the second end of the second resistor is connected with the input end of the first inverting amplifier, the output end of the first inverting amplifier is connected with the trigger end of the JK trigger, the forward output end and the reverse output end of the JK trigger are respectively connected with the first input end and the second input end of the push-pull current amplifying circuit in a one-to-one correspondence mode, and the output end of the push-pull current amplifying circuit is used for outputting a driving signal.
2. The magnetic resonance transmit front end of claim 1, wherein the frequency-giving unit comprises a signal source and a second inverting amplifier, wherein:
the signal source is used for outputting an initial frequency signal;
the input end of the second inverting amplifier is connected with the output end of the signal source, and the output end of the second inverting amplifier is used as the output end of the frequency giving unit and used for carrying out inverting amplification and shaping processing on the initial frequency signal to obtain the frequency signal.
3. The mr transmit front end of claim 2, wherein the signal source is a crystal oscillator.
4. The magnetic resonance transmit front end of claim 2, further comprising:
and the third inverting amplifier is used for performing inverting amplification and shaping processing on the pulse signal output by the first inverting amplifier, and the input end of the third inverting amplifier is connected with the output end of the first inverting amplifier, and the output end of the third inverting amplifier is connected with the trigger end of the JK trigger.
5. The magnetic resonance transmit front end of claim 1, wherein the push-pull current amplification circuit comprises a first amplifier, a second amplifier, a first controllable switch, and a second controllable switch, wherein:
the input end of the first amplifier is used as the first input end of the push-pull current amplification circuit, the output end of the first amplifier is connected with the control end of the first controllable switch, the input end of the second amplifier is used as the second input end of the push-pull current amplification circuit, the output end of the second amplifier is connected with the control end of the second controllable switch, the first end of the first controllable switch is connected with a power supply, the second end of the first controllable switch is connected with the first end of the second controllable switch, the common end of the first controllable switch is used as the output end of the push-pull current amplification circuit, and the second end of the second controllable switch is grounded.
6. The MR transmit front end of claim 5, wherein the first controllable switch and the second controllable switch are NPN transistors.
7. The magnetic resonance transmit front end of claim 5, wherein the first controllable switch and the second controllable switch are both NMOS.
8. The magnetic resonance transmit front end of claim 5, wherein the first controllable switch and the second controllable switch are both IGBTs.
9. A magnetic resonance transmit front end chip comprising a magnetic resonance transmit front end as claimed in any one of claims 1 to 8.
10. A power device driving circuit comprising a power device, further comprising the magnetic resonance transmit front end chip of claim 9, the magnetic resonance transmit front end chip for driving the power device.
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| CN201611147185.4A CN108616213B (en) | 2016-12-13 | 2016-12-13 | Magnetic resonance emission front end, chip and power device driving circuit |
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| CN201611147185.4A CN108616213B (en) | 2016-12-13 | 2016-12-13 | Magnetic resonance emission front end, chip and power device driving circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2323493Y (en) * | 1997-12-09 | 1999-06-09 | 北京工业大学 | Battery charging controlling device |
| CN1527469A (en) * | 2003-09-25 | 2004-09-08 | 福建实达电脑设备有限公司 | Switch power source driving control circuit |
| CN203368305U (en) * | 2013-06-27 | 2013-12-25 | 天津荣亨集团股份有限公司 | Driving circuit of IGBT module power switch |
| CN203774882U (en) * | 2014-03-31 | 2014-08-13 | 南京信息工程大学 | Wireless power wall-passing transmission device |
| CN105790447A (en) * | 2015-01-13 | 2016-07-20 | 三星电机株式会社 | Wireless power transmitter |
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2016
- 2016-12-13 CN CN201611147185.4A patent/CN108616213B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2323493Y (en) * | 1997-12-09 | 1999-06-09 | 北京工业大学 | Battery charging controlling device |
| CN1527469A (en) * | 2003-09-25 | 2004-09-08 | 福建实达电脑设备有限公司 | Switch power source driving control circuit |
| CN203368305U (en) * | 2013-06-27 | 2013-12-25 | 天津荣亨集团股份有限公司 | Driving circuit of IGBT module power switch |
| CN203774882U (en) * | 2014-03-31 | 2014-08-13 | 南京信息工程大学 | Wireless power wall-passing transmission device |
| CN105790447A (en) * | 2015-01-13 | 2016-07-20 | 三星电机株式会社 | Wireless power transmitter |
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Denomination of invention: A magnetic resonance emission front-end, chip, and power device driving circuit Granted publication date: 20200807 Pledgee: Huishang Bank Co.,Ltd. Fuyang Yingquan Branch Pledgor: ZONECHARGE (SHENZHEN) WIRELESS POWER TECHNOLOGY Co.,Ltd. Registration number: Y2024980029765 |
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