CN104656519A - Root canal length measuring instrument startup and shutdown circuit with power switching function - Google Patents
Root canal length measuring instrument startup and shutdown circuit with power switching function Download PDFInfo
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- CN104656519A CN104656519A CN201510076658.5A CN201510076658A CN104656519A CN 104656519 A CN104656519 A CN 104656519A CN 201510076658 A CN201510076658 A CN 201510076658A CN 104656519 A CN104656519 A CN 104656519A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
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- Automation & Control Theory (AREA)
- Keying Circuit Devices (AREA)
Abstract
The invention relates to a root canal length measuring instrument startup and shutdown circuit with a power switching function. The circuit comprises a power switching circuit, a power switch circuit, a switch driving circuit, a key circuit, a target board and a power adapter, wherein an input end of the power switching circuit is connected with the power adapter, an output end of the power switching circuit is connected with one input end of the power switch circuit, the other input end of the power switch circuit is connected with common terminals of the switch driving circuit and the key circuit, an output end of the power switch circuit is connected with a power input end of the target board, a single-chip microcomputer control signal end of the target board is connected with one input end of the switch driving circuit, the other input end of the switch driving circuit is connected with the power adapter, and a key detection signal end of the target board is connected with an output end of the key circuit. With the adoption of the circuit, startup is quick, and safety and power-saving effects can be realized during shutdown; the service life of a rechargeable battery is prolonged, and the safety degree of the rechargeable battery is increased; direct contract of a human body with a power supply is isolated, and the use safety degree is increased.
Description
Technical field
The present invention relates to dentistry field, especially a kind of root canal length meter on/off circuit with electrical source exchange function.
Background technology
Root canal length meter (being called for short " root survey instrument ") is a kind of department of stomatology utility appliance for measuring tooth root length of tube, for helping doctor before carrying out tooth root canal, measures the physical length that tooth root pipe arrives tooth apical area.Root canal file is inserted in tooth root pipe when using by root canal length meter, is then connected by the circuit of root canal file with root canal length meter main frame; Another electrode of root canal length meter main frame is linked up with circuit with the lip hung in the oral cavity and is connected.Root canal file sends the electric current of two different frequencies in tooth root pipe, and main frame is measured two electric currents and determined the position of root canal file point in root pipe by the ratio (this ratio is not by the impact of root pipe Inner electrolysis matter) of the resistance value of root pipe.When root canal file arrives apical area, the main frame of root canal length meter can show in real time and give the alarm, and doctor takes out the physical length that root canal file measurement enters into tooth root pipe, just can measure the physical length of tooth root pipe.When root cap cell, root canal length meter can send a 8K high-frequency signal and a 400Hz low frequency signal at test lead, and obtain impedance corresponding to two frequencies respectively, then look into a known measurement result according to the size of impedance under two frequencies and corresponding table thus obtain measurement result.
In the power-offstate, whole host circuit board is charged to existing root canal length meter, and this mode can cause battery to be in the state of slow electric discharge all the time, is not durable; Use rechargeable battery powered root to survey instrument, in charging process, the circuit of whole mainboard is communicated with charging end, battery, and security is inadequate.
Summary of the invention
The invention provides a kind of root canal length meter on/off circuit with electrical source exchange function, technical matters to be solved is the problem that existing root canal length meter battery is not durable and security is inadequate.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of root canal length meter on/off circuit with electrical source exchange function, comprises power supply switch circuit, power switch circuit, switch driving circuit, key circuit, Target Board and power supply adaptor, the input end of described power supply switch circuit connects described power supply adaptor, the output terminal of described power supply switch circuit connects an input end of described power switch circuit, another input end of described power switch circuit connects the common port of described switch driving circuit and described key circuit, the output terminal of described power switch circuit connects the power input of described Target Board, the Single-chip Controlling signal end of described Target Board connects an input end of described switch driving circuit, another input end of described switch driving circuit connects described power supply adaptor, the button detection signal end of described Target Board connects the output terminal of described key circuit.
Described power supply switch circuit, for carrying out the switching of power supply when described power supply adaptor is communicated with power supply, and provides power supply for subsequent conditioning circuit.
Described Target Board, for detecting the button detection signal of described key circuit and sending Single-chip Controlling signal to described switch driving circuit.
Described switch driving circuit, for receiving the Single-chip Controlling signal of described Target Board and controlling being turned on or off of described power switch circuit.
Described power switch circuit, the level signal for exporting according to described switch driving circuit controls being communicated with or disconnection between described Target Board with described power supply switch circuit.
The invention has the beneficial effects as follows: the on time is accurately controlled by Target Board, make start rapider; During shutdown, power supply and Target Board can disconnect completely, safer, power saving; When the adapter that plugs in charge to rechargeable battery and powers, rechargeable battery is no longer powered to Target Board, can improve the serviceable life of rechargeable battery, and degree of safety when improving rechargeable battery charging; By by the break-make of key control power supply, to isolate between human body with power supply direct contacts, and increases use safety degree.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described power supply adaptor adopts 5V out-put supply adapter.
Further, described power supply switch circuit comprises the first diode, the second diode, the first PMOS, the first electric capacity, the first resistance and rechargeable battery; Described first diode is all connected described power supply adaptor with the positive pole of described second diode, and the negative pole of described first diode is by described first capacity earth, and the negative pole of described second diode is by described first resistance eutral grounding; The grid of described first PMOS connects the negative pole of described second diode, the source electrode of described first PMOS connects the positive pole of described rechargeable battery, the minus earth of described rechargeable battery, the drain electrode of described first PMOS connects the negative pole of described first diode; The negative pole of described first diode is the output terminal of described power supply switch circuit.
Further, described rechargeable battery adopts lithium battery.
Further, described power switch circuit comprises the second PMOS, the second resistance and the second electric capacity; The source electrode of described second PMOS connects the output terminal of described power supply switch circuit, the grid of described second PMOS connects the common port of described switch driving circuit and described key circuit, and the drain electrode of described second PMOS connects the power input of described Target Board; The grid of described second PMOS be connected described second resistance between source electrode, the drain electrode of described second PMOS is by described second capacity earth.
Further, described switch driving circuit comprises NMOS tube, the 3rd resistance, the 4th resistance, the 5th resistance and the 3rd diode; The grid of described NMOS tube be connected described 5th resistance between source electrode, the source ground of described NMOS tube, the drain electrode of described NMOS tube connects another input end of described power switch circuit; Described 3rd resistance with the common port of the 4th resistance be connected the grid of described NMOS tube, the other end of described 3rd resistance connects the Single-chip Controlling signal end of described Target Board, the other end of the 4th resistance connect described power supply adaptor.
Further, described key circuit comprises the 4th diode, the 5th diode, the 3rd electric capacity, the 4th electric capacity and button; Described 4th electric capacity is in parallel with described button, and one of them common port connects the negative pole of described 4th diode, another common end grounding; The positive pole of described 4th diode connects the button detection signal end of described Target Board; The negative pole of described 5th diode connects the negative pole of described 4th diode, and the positive pole of described 5th diode connects another input end of described power switch circuit; One end of described 3rd electric capacity connects the positive pole of described 5th diode, the other end ground connection of described 3rd electric capacity.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention.
In accompanying drawing, the list of parts representated by each label is as follows:
1, power supply switch circuit, 2, power switch circuit, 3, switch driving circuit, 4, key circuit, U1, Target Board, Q1, the first PMOS, Q2, the second PMOS, Q3, NMOS tube, D1, the first diode, D2, the second diode, D3, the 3rd diode, D4, the 4th diode, D5, the 5th diode, R1, the first resistance, R2, the second resistance, R3, the 3rd resistance, R4, the 4th resistance, R5, the 5th resistance, C1, the first electric capacity, C2, the second electric capacity, C3, the 3rd electric capacity, C4, the 4th electric capacity, SW1, button.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figure 1 and Figure 2, a kind of root canal length meter on/off circuit with electrical source exchange function, comprises power supply switch circuit 1, power switch circuit 2, switch driving circuit 3, key circuit 4, Target Board U1 and power supply adaptor, the input end of described power supply switch circuit 1 connects described power supply adaptor, the output terminal of described power supply switch circuit 1 connects an input end of described power switch circuit 2, another input end of described power switch circuit 2 connects the common port of described switch driving circuit 3 and described key circuit 4, the output terminal of described power switch circuit 2 connects the power input of described Target Board U1, the Single-chip Controlling signal end of described Target Board U1 connects an input end of described switch driving circuit 3, another input end of described switch driving circuit 3 connects described power supply adaptor, the button detection signal end of described Target Board U1 connects the output terminal of described key circuit 4.
Described power supply switch circuit 1, for carrying out the switching of power supply when described power supply adaptor is communicated with power supply, and provides power supply for subsequent conditioning circuit.
Described Target Board U1, for detecting the button detection signal of described key circuit 4 and sending Single-chip Controlling signal to described switch driving circuit 3.
Described switch driving circuit 3, for receiving the Single-chip Controlling signal of described Target Board U1 and controlling being turned on or off of described power switch circuit 2.
Described power switch circuit 2, controls being communicated with or disconnection between described Target Board U1 with described power supply switch circuit 1 for the level signal exported according to described switch driving circuit 3.
Described power supply adaptor adopts 5V out-put supply adapter.
Described power supply switch circuit 1 comprises the first diode D1, the second diode D2, the first PMOS Q1, the first electric capacity C1, the first resistance R1 and rechargeable battery; Described first diode D1 is all connected described power supply adaptor with the positive pole of described second diode D2, and the negative pole of described first diode D1 is by described first electric capacity C1 ground connection, and the negative pole of described second diode D2 is by described first resistance R1 ground connection; The grid of described first PMOS Q1 connects the negative pole of described second diode D2, the source electrode of described first PMOS Q1 connects the positive pole of described rechargeable battery, the minus earth of described rechargeable battery, the drain electrode of described first PMOS Q1 connects the negative pole of described first diode D1; The negative pole of described first diode D1 is the output terminal of described power supply switch circuit 1.
Described rechargeable battery adopts lithium battery.
Described power switch circuit 2 comprises the second PMOS Q2, the second resistance R2 and the second electric capacity C2; The source electrode of described second PMOS Q2 connects the output terminal of described power supply switch circuit 1, the grid of described second PMOS Q2 connects the common port of described switch driving circuit 3 and described key circuit 4, and the drain electrode of described second PMOS Q2 connects the power input of described Target Board U1; The grid of described second PMOS Q2 be connected described second resistance R2 between source electrode, the drain electrode of described second PMOS Q2 is by described second electric capacity C2 ground connection.
Described switch driving circuit 3 comprises NMOS tube Q3, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5 and the 3rd diode D3; The grid of described NMOS tube Q3 be connected described 5th resistance R5 between source electrode, the source ground of described NMOS tube Q3, the drain electrode of described NMOS tube Q3 connects another input end of described power switch circuit 2; Described 3rd resistance R3 with the common port of the 4th resistance R4 be connected the grid of described NMOS tube Q3, the other end of described 3rd resistance R3 connects the Single-chip Controlling signal end of described Target Board U1, the other end of the 4th resistance R4 connect described power supply adaptor.
Described key circuit 4 comprises the 4th diode D4, the 5th diode D5, the 3rd electric capacity C3, the 4th electric capacity C4 and button SW1; Described 4th electric capacity C4 is in parallel with described button SW1, and one of them common port connects the negative pole of described 4th diode D4, another common end grounding; The positive pole of described 4th diode D4 connects the button detection signal end of described Target Board U1; The negative pole of described 5th diode D5 connects the negative pole of described 4th diode D4, and the positive pole of described 5th diode D5 connects another input end of described power switch circuit 2; One end of described 3rd electric capacity C3 connects the positive pole of described 5th diode D5, the other end ground connection of described 3rd electric capacity C3.
The present invention is the circuit of root canal length meter switching on and shutting down part, and have the function that start, shutdown and power supply source switch, concrete function is described below:
(1) power up function describe: when push button SW1 time, second PMOS Q2 conducting, power supply goes out on Target Board U1 by power supply switch circuit 1, machine is started working, now Target Board U1 can detect that the button detection signal of key circuit 4 is low level, and the Single-chip Controlling signal that switch driving circuit 3 is received is high level, then NMOS tube Q3 conducting, thus make the second PMOS Q2 conducting always of Part II, and always out-put supply to Target Board U1.
(2) shut-off function describes: push button SW1, the button detection signal that Target Board U1 detects is low level, thus the Single-chip Controlling signal end output low level of trigger target plate U1, thus make the second PMOS Q2 become shutoff from conducting, make Target Board U1 there is no power supply, realize shutdown.
(3) power supply source handoff functionality describes: when root canal length meter needs charging, insert 5V power supply adaptor to lithium cell charging, at this moment the first PMOS Q1 becomes shutoff from conducting, now the out-put supply of power switch circuit 2 is 5V out-put supply adapter, and make NMOS tube Q3 conducting by the 3rd diode D3, thus making the second PMOS Q2 conducting, Target Board U1 is communicated with power supply.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. one kind has the root canal length meter on/off circuit of electrical source exchange function, it is characterized in that, comprise power supply switch circuit (1), power switch circuit (2), switch driving circuit (3), key circuit (4), Target Board (U1) and power supply adaptor, the input end of described power supply switch circuit (1) connects described power supply adaptor, the output terminal of described power supply switch circuit (1) connects an input end of described power switch circuit (2), another input end of described power switch circuit (2) connects the common port of described switch driving circuit (3) and described key circuit (4), the output terminal of described power switch circuit (2) connects the power input of described Target Board (U1), the Single-chip Controlling signal end of described Target Board (U1) connects an input end of described switch driving circuit (3), another input end of described switch driving circuit (3) connects described power supply adaptor, the button detection signal end of described Target Board (U1) connects the output terminal of described key circuit (4),
Described power supply switch circuit (1), for carrying out the switching of power supply when described power supply adaptor is communicated with power supply, and provides power supply for subsequent conditioning circuit;
Described Target Board (U1), for detecting the button detection signal of described key circuit (4) and sending Single-chip Controlling signal to described switch driving circuit (3);
Described switch driving circuit (3), for receiving the Single-chip Controlling signal of described Target Board (U1) and controlling being turned on or off of described power switch circuit (2);
Described power switch circuit (2), the level signal for exporting according to described switch driving circuit (3) controls being communicated with or disconnection between described Target Board (U1) with described power supply switch circuit (1).
2. a kind of root canal length meter on/off circuit with electrical source exchange function according to claim 1, is characterized in that, described power supply adaptor adopts 5V out-put supply adapter.
3. a kind of root canal length meter on/off circuit with electrical source exchange function according to claim 1 or 2, it is characterized in that, described power supply switch circuit (1) comprises the first diode (D1), the second diode (D2), the first PMOS (Q1), the first electric capacity (C1), the first resistance (R1) and rechargeable battery; Described first diode (D1) is all connected described power supply adaptor with the positive pole of described second diode (D2), the negative pole of described first diode (D1) is by described first electric capacity (C1) ground connection, and the negative pole of described second diode (D2) is by described first resistance (R1) ground connection; The grid of described first PMOS (Q1) connects the negative pole of described second diode (D2), the source electrode of described first PMOS (Q1) connects the positive pole of described rechargeable battery, the minus earth of described rechargeable battery, the drain electrode of described first PMOS (Q1) connects the negative pole of described first diode (D1); The negative pole of described first diode (D1) is the output terminal of described power supply switch circuit (1).
4. a kind of root canal length meter on/off circuit with electrical source exchange function according to claim 3, is characterized in that, described rechargeable battery adopts lithium battery.
5. a kind of root canal length meter on/off circuit with electrical source exchange function according to claim 1 or 2, it is characterized in that, described power switch circuit (2) comprises the second PMOS (Q2), the second resistance (R2) and the second electric capacity (C2); The source electrode of described second PMOS (Q2) connects the output terminal of described power supply switch circuit (1), the grid of described second PMOS (Q2) connects the common port of described switch driving circuit (3) and described key circuit (4), and the drain electrode of described second PMOS (Q2) connects the power input of described Target Board (U1); The grid of described second PMOS (Q2) be connected described second resistance (R2) between source electrode, the drain electrode of described second PMOS (Q2) is by described second electric capacity (C2) ground connection.
6. a kind of root canal length meter on/off circuit with electrical source exchange function according to claim 1 or 2, it is characterized in that, described switch driving circuit (3) comprises NMOS tube (Q3), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5) and the 3rd diode (D3); The grid of described NMOS tube (Q3) be connected described 5th resistance (R5) between source electrode, the source ground of described NMOS tube (Q3), the drain electrode of described NMOS tube (Q3) connects another input end of described power switch circuit (2); Described 3rd resistance (R3) with the common port of the 4th resistance (R4) be connected the grid of described NMOS tube (Q3), the other end of described 3rd resistance (R3) connects the Single-chip Controlling signal end of described Target Board (U1), the other end of the 4th resistance (R4) connect described power supply adaptor.
7. a kind of root canal length meter on/off circuit with electrical source exchange function according to claim 1 or 2, it is characterized in that, described key circuit (4) comprises the 4th diode (D4), the 5th diode (D5), the 3rd electric capacity (C3), the 4th electric capacity (C4) and button (SW1); Described 4th electric capacity (C4) is in parallel with described button (SW1), and one of them common port connects the negative pole of described 4th diode (D4), another common end grounding; The positive pole of described 4th diode (D4) connects the button detection signal end of described Target Board (U1); The negative pole of described 5th diode (D5) connects the negative pole of described 4th diode (D4), and the positive pole of described 5th diode (D5) connects another input end of described power switch circuit (2); One end of described 3rd electric capacity (C3) connects the positive pole of described 5th diode (D5), the other end ground connection of described 3rd electric capacity (C3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510076658.5A CN104656519A (en) | 2015-02-12 | 2015-02-12 | Root canal length measuring instrument startup and shutdown circuit with power switching function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510076658.5A CN104656519A (en) | 2015-02-12 | 2015-02-12 | Root canal length measuring instrument startup and shutdown circuit with power switching function |
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| CN104656519A true CN104656519A (en) | 2015-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510076658.5A Pending CN104656519A (en) | 2015-02-12 | 2015-02-12 | Root canal length measuring instrument startup and shutdown circuit with power switching function |
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| CN (1) | CN104656519A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107844075A (en) * | 2017-10-27 | 2018-03-27 | 上海歌尔泰克机器人有限公司 | A kind of ground wire ON-OFF control circuit and a kind of electronic equipment |
| CN110518655A (en) * | 2019-07-30 | 2019-11-29 | 厦门盈趣科技股份有限公司 | The switching on and shutting down control circuit of portable tape battery apparatus |
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Application publication date: 20150527 |