CN213275736U - Bus voltage detection circuit for dental CBCT high voltage - Google Patents
Bus voltage detection circuit for dental CBCT high voltage Download PDFInfo
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- CN213275736U CN213275736U CN202021597427.1U CN202021597427U CN213275736U CN 213275736 U CN213275736 U CN 213275736U CN 202021597427 U CN202021597427 U CN 202021597427U CN 213275736 U CN213275736 U CN 213275736U
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Abstract
The utility model discloses a bus voltage detection circuit for dental CBCT high voltage, which comprises a first isolation unit, wherein the input end of the first isolation unit is connected with a bus to be detected; an emitter follower unit, an input end of which is connected with an output end of the first isolation unit; the input end of the voltage following unit is connected with the output end of the emitter following unit; the input end of the proportional operation amplifying unit is connected with the voltage following unit; and the input end of the negative feedback comparison output unit is connected with the proportional operation amplifying unit. The first isolation unit isolates high voltage and low voltage, the safety of a circuit is improved, the emitter following unit, the voltage following unit, the proportional operation amplifying unit and the negative feedback comparison output unit perform voltage conversion on the voltage of the bus terminal according to a preset proportion, and accurate sampling of the bus voltage is achieved.
Description
Technical Field
The utility model relates to a dental technology field, in particular to a be used for highly compressed bus voltage detection circuit of dentistry CBCT.
Background
CBCT (Cone beam CT) is the most promising and practical device in the oral cavity and skull imaging device nowadays, and the application of CBCT brings revolutionary changes to diagnosis and treatment in the clinical fields of oral cavity and skull.
The principle of CBCT is that an X-ray generator makes a circular digital projection around a projection with a low dose, and then the data obtained in the "intersection" after multiple digital projections around the projection is "recombined" in a computer to obtain a three-dimensional image.
The X-ray generator needs a bus to provide high voltage when working, and needs to detect the voltage of the bus in order to detect the running condition of the bus. At present, the voltage acquisition schemes of the bus generally have two types: firstly, a power frequency transformer is adopted, and the linearity and isolation of the transformer are utilized to realize the accurate detection of a bus, but the transformer cannot realize wide-range work by collecting voltage, and the circuit is large in volume; second, the operational amplifier is used for voltage comparison, but the operational amplifier cannot perform isolation of high and low voltages.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a be used for highly compressed bus voltage detection circuit of dentistry CBCT can carry out voltage acquisition to the generating line to and realize the high-low pressure and keep apart.
According to the utility model discloses a be used for dentistry CBCT high pressure generating line voltage detection circuit, including first isolation element, the input is connected with the generating line that detects; an emitter follower unit, an input end of which is connected with an output end of the first isolation unit; the input end of the voltage following unit is connected with the output end of the emitter following unit; the input end of the proportional operation amplifying unit is connected with the voltage following unit; and the input end of the negative feedback comparison output unit is connected with the proportional operation amplifying unit.
According to the utility model discloses a be used for highly compressed bus voltage detection circuit of dentistry CBCT has following beneficial effect at least:
the first isolation unit isolates high voltage and low voltage, the safety of a circuit is improved, the emitter following unit, the voltage following unit, the proportional operation amplifying unit and the negative feedback comparison output unit perform voltage conversion on the voltage of the bus terminal according to a preset proportion, and accurate sampling of the bus voltage is achieved.
According to some embodiments of the present invention, the emitter follower unit comprises a first comparator U8D and a second isolating optical coupler E7, the non-inverting input terminal of the first comparator U8D is connected to the output terminal of the first isolating unit, a negative feedback resistor R117 is connected between the output terminal and the inverting input terminal of the first comparator U8D, the output terminal of the first comparator U8D is further connected to the positive terminal of a diode D18, the negative terminal of the diode D18 is connected to a first voltage dividing circuit and is connected to the positive terminal of the second isolating optical coupler E7 through the first voltage dividing circuit, the negative terminal of the second isolating optical coupler E7 is connected to a resistor R105 and is grounded through the resistor R105, the negative terminal of the second isolating optical coupler E7 is used as the output terminal of the emitter follower unit, the collector terminal of the second isolating optical coupler E7 is connected to a working voltage, the emitter terminal of the second isolating optical coupler E7 is connected to a resistor R104, and the emitter of the second isolating optocoupler E7 is also connected with the inverting input end of the first comparator U8D through the resistor R104.
According to some embodiments of the utility model, be connected with diode D33 between the projecting pole pin and the collector pin of second isolation opto-coupler E7, diode D33 the positive pole with the projecting pole pin of second isolation opto-coupler E7 is connected, diode D33's negative pole with the collector pin of second isolation opto-coupler E7 is connected.
According to some embodiments of the present invention, the voltage following unit comprises a second comparator U8A, the non-inverting input terminal of the second comparator U8A is connected to a resistor R115, and through the resistor R115 is connected to the output terminal of the emitter following unit, the output terminal and the inverting input terminal of the second comparator U8A are connected, the output terminal of the second comparator U8A is connected to the proportional operational amplifier unit.
According to some embodiments of the present invention, the proportional operational amplifier unit includes a third comparator U8B, the non inverting input terminal of the third comparator U8B is connected with a resistor R119, and through the resistor R119 and the voltage follower unit are connected, the inverting input terminal of the third comparator U8B is connected with a resistor R123, and through the resistor R123 is grounded, a feedback resistor VR1 is connected between the output terminal and the inverting input terminal of the third comparator U8B, and the output terminal of the third comparator U8B is connected with the negative feedback comparison output unit.
According to some embodiments of the invention, the feedback resistor VR1 is an adjustable resistor.
According to some embodiments of the present invention, the negative feedback comparison output unit includes a fourth comparator U8C and a transistor Q2, a resistor R116 is connected to a non-inverting input terminal of the fourth comparator U8C, and is connected to the proportional operational amplifier unit through the resistor R116, a capacitor C76 is connected between an output terminal and an inverting input terminal of the fourth comparator U8C, an output terminal of the fourth comparator U8C is further connected to an anode of a diode D38, a cathode of the diode D38 is connected to a base of the transistor Q2, a collector of the transistor Q2 is connected to an operating voltage, an emitter of the transistor Q2 is connected to a first terminal of the resistor R112, a second terminal of the resistor R112 is connected to an output node a with a first terminal of the resistor R120, a second terminal of the resistor R120 is grounded, a resistor R118 is further connected between the output node a and the inverting input terminal of the fourth comparator U8C, the output node A is connected with a capacitor C19 and is grounded through the capacitor C19.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic block diagram of a bus voltage detection circuit for dental CBCT high voltage according to an embodiment of the present invention;
fig. 2 is a circuit schematic diagram of the bus voltage detection circuit for dental CBCT high voltage shown in fig. 1.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
Referring to fig. 1, the present embodiment discloses a bus voltage detection circuit for dental CBCT high voltage, which includes a first isolation unit 100, an emitter follower unit 200, a voltage follower unit 300, a proportional operation amplification unit 400, and a negative feedback comparison output unit 500, which are connected in sequence, wherein an input end of the first isolation unit 100 is connected to a bus to be detected, and an output end of the negative feedback comparison output unit 500 is used for outputting a voltage converted according to a preset ratio. The first isolation unit 100 isolates high voltage and low voltage, which is beneficial to improving the safety of the circuit, and the emitter following unit 200, the voltage following unit 300, the proportional operation amplifying unit 400 and the negative feedback comparison output unit 500 perform voltage conversion on the voltage of the bus terminal according to a preset proportion, so that accurate sampling of the bus voltage is realized.
Referring to fig. 2, the first isolation unit 100 includes a first isolation optocoupler E1, an anode pin and a cathode pin of the first isolation optocoupler E1 are connected to a bus to be tested through a resistor R15 and a resistor R17, respectively, to be connected to a mains supply, a collector of the first isolation optocoupler E1 is connected to a working voltage, an emitter pin of the first isolation optocoupler E1 is connected to a resistor R107 and is grounded through a resistor R107, a diode D16 is further connected between the collector pin and the emitter pin of the first isolation optocoupler E1, and the diode D16 can protect the first isolation optocoupler E1. The first isolation optocoupler E1 is a linear optocoupler, the working voltage range of the first isolation optocoupler E1 is 120V-390V, a diode D8, a diode D9 and a capacitor C1 which are connected in parallel are connected between an anode pin and a cathode pin of the first isolation optocoupler E1, and the diode D8 and the diode D9 can protect the first isolation optocoupler E1. Since the auxiliary power supply is already working after the dental CBCT is powered on, the output end of the first isolating optocoupler E1 obtains a first linear voltage within a preset range, and the first linear voltage is input to the emitter follower unit 200.
Referring to fig. 2, the emitter follower unit 200 includes a first comparator U8D and a second isolation optocoupler E7, a non-inverting input terminal of the first comparator U8D is connected to an output terminal of the first isolation unit 100, a negative feedback resistor R117 is connected between an output terminal and an inverting input terminal of the first comparator U8D, an output terminal of the first comparator U8D is further connected to an anode of a diode D18, a cathode of the diode D18 is connected to a first voltage dividing circuit, and is connected to an anode pin of the second isolation optocoupler E7 through the first voltage dividing circuit, the first voltage dividing circuit includes a resistor R113 and a resistor R114, a cathode pin of the second isolation optocoupler E7 is connected to a resistor R105 and is grounded through the resistor R105, a cathode pin of the second isolation optocoupler E7 is used as the output terminal of the emitter follower unit 200, a collector pin of the second isolation optocoupler E7 is connected to a working voltage, an emitter pin of the second isolation optocoupler E7 is connected to a resistor R, and is grounded through a resistor R104, and the emitter of the second isolating optocoupler E7 is also connected with the inverting input terminal of the first comparator U8D. The first linear voltage output by the first isolation unit 100 is compared by the first comparator U8D and then enters the second isolation optocoupler E7 through the diode D18 and the resistor R113, the second isolation optocoupler E7 returns a signal to the inverting input end of the first comparator U8D, and therefore the second linear voltage is obtained at the cathode pin of the second isolation optocoupler E7 and is input to the voltage following unit 300.
In order to protect the second isolating optocoupler E7, a diode D33 is connected between an emitter pin and a collector pin of the second isolating optocoupler E7, the anode of the diode D33 is connected with the emitter pin of the second isolating optocoupler E7, and the cathode of the diode D33 is connected with the collector pin of the second isolating optocoupler E7.
The voltage follower unit 300 comprises a second comparator U8A, a resistor R115 is connected to the non-inverting input end of the second comparator U8A and is connected with the output end of the emitter follower unit 200 through the resistor R115, the output end and the inverting input end of the second comparator U8A are connected, and the output end of the second comparator U8A is connected with the proportional operational amplifier unit 400. The voltage follower unit 300 performs impedance matching and inputs the second linear voltage to the proportional operational amplifier unit 400.
The proportional operation amplifying unit 400 comprises a third comparator U8B, the non-inverting input end of the third comparator U8B is connected with a resistor R119 and is connected with the voltage following unit 300 through the resistor R119, the inverting input end of the third comparator U8B is connected with a resistor R123 and is grounded through the resistor R123, a feedback resistor VR1 is connected between the output end and the inverting input end of the third comparator U8B, and the output end of the third comparator U8B is connected with the negative feedback comparison output unit 500. The third comparator U8B constitutes a proportional operational amplifier circuit for performing proportional operation on the second linear voltage and inputting the operation result to the negative feedback comparison output unit 500. In order to adjust the voltage conversion ratio, the feedback resistor VR1 is an adjustable resistor.
The negative feedback comparison output unit 500 comprises a fourth comparator U8C and a triode Q2, wherein a resistor R116 is connected to a non-inverting input terminal of the fourth comparator U8C and is connected with the proportional operational amplifier unit 400 through the resistor R116, a capacitor C76 is connected between an output terminal and an inverting input terminal of the fourth comparator U8C, an output terminal of the fourth comparator U8C is further connected with an anode of a diode D38, a cathode of the diode D38 is connected with a base of the triode Q2, a collector of the triode Q2 is connected with a working voltage, an emitter of the triode Q2 is connected with a first end of a resistor R112, a second end of the resistor R112 and a first end of a resistor R120 are connected to an output node a, a second end of the resistor R120 is grounded, a resistor R118 is further connected between the output node a and the inverting input terminal of the fourth comparator U8C, the output node a is connected with a capacitor C19 and is grounded through a capacitor C19. The fourth comparator U8C controls the conduction depth of the transistor Q2 according to the output signal of the scaling unit 400, and after the voltage is divided by the resistor R112 and the resistor R120, a voltage obtained by converting the bus voltage according to a preset ratio is obtained at the output node a, for example, the bus voltage is 120V, and the conversion ratio is set to 1: 100, the voltage of the output node A is set to be 1.2V, and then when the bus voltage is 390V, the voltage of the output node A is 3.9V, and the error value is less than or equal to 5%.
The isolation of bus voltage and accurate voltage acquisition can be realized through the combination of isolation optocoupler and operational amplifier, and the monitoring of a high-voltage end on a low-voltage side is facilitated.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (7)
1. A bus voltage detection circuit for dental CBCT high voltage, comprising:
the input end of the first isolation unit (100) is connected with the bus to be detected;
an emitter follower unit (200) having an input terminal connected to an output terminal of the first isolation unit (100);
a voltage follower unit (300) having an input terminal connected to an output terminal of the emitter follower unit (200);
the input end of the proportional operation amplifying unit (400) is connected with the voltage following unit (300);
and the input end of the negative feedback comparison output unit (500) is connected with the proportional operation amplification unit (400).
2. The bus voltage detection circuit for dental CBCT high voltage according to claim 1, wherein the emitter follower unit (200) comprises a first comparator U8D and a second isolation optocoupler E7, the non-inverting input terminal of the first comparator U8D is connected with the output terminal of the first isolation unit (100), a negative feedback resistor R117 is connected between the output terminal and the inverting input terminal of the first comparator U8D, the output terminal of the first comparator U8D is further connected with the anode terminal of a diode D18, the cathode terminal of the diode D18 is connected with a first voltage dividing circuit and is connected with the anode pin of the second isolation optocoupler E7 through the first voltage dividing circuit, the cathode pin of the second isolation optocoupler E7 is connected with a resistor R105 and is grounded through the resistor R105, the cathode pin of the second isolation optocoupler E7 is used as the output terminal of the emitter follower unit (200), the collector pin of the second isolation optocoupler E7 is connected with working voltage, the emitter pin of the second isolation optocoupler E7 is connected with a resistor R104 and is grounded through the resistor R104, and the emitter of the second isolation optocoupler E7 is also connected with the inverting input end of the first comparator U8D.
3. The bus voltage detection circuit for dental CBCT high voltage as claimed in claim 2, wherein a diode D33 is connected between an emitter pin and a collector pin of the second isolating optocoupler E7, an anode of the diode D33 is connected with an emitter pin of the second isolating optocoupler E7, and a cathode of the diode D33 is connected with a collector pin of the second isolating optocoupler E7.
4. The bus voltage detection circuit for dental CBCT high voltage according to claim 1, wherein the voltage follower unit (300) comprises a second comparator U8A, a resistor R115 is connected to a non-inverting input terminal of the second comparator U8A and is connected with the output terminal of the emitter follower unit (200) through the resistor R115, an output terminal and an inverting input terminal of the second comparator U8A are connected, and an output terminal of the second comparator U8A is connected with the proportional operational amplifier unit (400).
5. The bus voltage detection circuit for dental CBCT high voltage according to claim 1, wherein said proportional operational amplifier unit (400) comprises a third comparator U8B, a resistor R119 is connected to a non-inverting input terminal of said third comparator U8B and connected to said voltage follower unit (300) through said resistor R119, a resistor R123 is connected to an inverting input terminal of said third comparator U8B and grounded through said resistor R123, a feedback resistor VR1 is connected between an output terminal and an inverting input terminal of said third comparator U8B, and an output terminal of said third comparator U8B is connected to said negative feedback comparison output unit (500).
6. The bus voltage detection circuit for dental CBCT high voltage according to claim 5, wherein the feedback resistor VR1 is an adjustable resistor.
7. The bus voltage detection circuit for dental CBCT high voltage according to claim 1, wherein said negative feedback comparison output unit (500) comprises a fourth comparator U8C and a transistor Q2, a resistor R116 is connected to a non-inverting input terminal of said fourth comparator U8C and is connected to said proportional operational amplifier unit (400) through said resistor R116, a capacitor C76 is connected between an output terminal and an inverting input terminal of said fourth comparator U8C, an output terminal of said fourth comparator U8C is further connected to an anode of a diode D38, a cathode of said diode D38 is connected to a base of said transistor Q2, a collector of said transistor Q2 is connected to an operating voltage, an emitter of said transistor Q2 is connected to a first terminal of a resistor R112, a second terminal of said resistor R112 is connected to a first terminal of a resistor R120, a second terminal of said resistor R120 is grounded, a resistor R118 is further connected between the output node a and the inverting input terminal of the fourth comparator U8C, and the output node a is connected with a capacitor C19 and grounded through the capacitor C19.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021597427.1U CN213275736U (en) | 2020-08-04 | 2020-08-04 | Bus voltage detection circuit for dental CBCT high voltage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021597427.1U CN213275736U (en) | 2020-08-04 | 2020-08-04 | Bus voltage detection circuit for dental CBCT high voltage |
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| CN213275736U true CN213275736U (en) | 2021-05-25 |
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| CN202021597427.1U Active CN213275736U (en) | 2020-08-04 | 2020-08-04 | Bus voltage detection circuit for dental CBCT high voltage |
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Effective date of registration: 20211022 Address after: 2 / F, building a, R & D and production building, No. 18, science and technology fifth road, innovation coast, Tangjiawan Town, high tech Zone, Zhuhai, Guangdong 519000 Patentee after: ZHUHAI RUIYING TECHNOLOGY CO.,LTD. Address before: 2 / F, building B, No.18, science and technology fifth road, innovation coast, Tangjiawan Town, high tech Zone, Zhuhai, Guangdong 519000 Patentee before: Mingfeng Technology (Zhuhai) Co.,Ltd. |
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Assignee: Hengqin Financial Investment International Finance Leasing Co.,Ltd. Assignor: ZHUHAI RUIYING TECHNOLOGY CO.,LTD. Contract record no.: X2023980034955 Denomination of utility model: Bus Voltage Detection Circuit for Dental CBCT High Voltage Granted publication date: 20210525 License type: Exclusive License Record date: 20230421 |
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Denomination of utility model: Bus Voltage Detection Circuit for Dental CBCT High Voltage Effective date of registration: 20230424 Granted publication date: 20210525 Pledgee: Hengqin Financial Investment International Finance Leasing Co.,Ltd. Pledgor: ZHUHAI RUIYING TECHNOLOGY CO.,LTD. Registration number: Y2023980038990 |
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