CN103152019B - A kind of reset circuit of control lever - Google Patents
A kind of reset circuit of control lever Download PDFInfo
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- CN103152019B CN103152019B CN201110401566.1A CN201110401566A CN103152019B CN 103152019 B CN103152019 B CN 103152019B CN 201110401566 A CN201110401566 A CN 201110401566A CN 103152019 B CN103152019 B CN 103152019B
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Abstract
The invention discloses a kind of reset circuit and Medical Devices of control lever.Reset circuit comprises: delay circuit, time-delay reset circuit, resetting time control circuit and the normally closed electronic switch between described control lever and power supply; Wherein, delay circuit is used for, when described control lever exports control signal, carrying out timing to the output duration of described control signal, when the output duration of described control signal reaches the safety time of setting, exports reset trigger signal to control circuit resetting time; Time-delay reset circuit is used for, when described control lever exports invalid signals, resetting to the timing of described delay circuit; Resetting time, control circuit was used for, when described delay circuit exports reset trigger signal, controlling described electronic switch and disconnecting, and when disconnecting duration and reaching the resetting time of setting, controlled described electronic switch closes.Technical scheme disclosed in this invention, can making the control circuit of control lever reset when there is misoperation, recovering normal function.
Description
Technical Field
The invention relates to the technical field of electronic control, in particular to a reset circuit for an operating rod of medical equipment and the medical equipment.
Background
Medical devices such as X-ray machines, Computed Tomography (CT) devices, and Magnetic Resonance Imaging (MRI) devices are increasingly being used. For medical devices, it is necessary to ensure that patients and operators are safe when moving the moving parts, so the safety requirements for the control of the movement of the moving parts are high, i.e. the movement must be strictly controlled. For the control of the moving parts, the following three links are generally included:
first, acquisition of motion control signals. The motion control signal is input through a human-computer interface of the console, and two modes, namely a key and an operation rod, are most commonly used.
Second, transmission of motion control signals. Typically by way of a switching signal or communication bus from the console to the motion controller.
Third, execution of the motion. The associated motion is typically performed by a control motor of the motion controller in accordance with a motion control signal.
The transmission of the motion control signal is often subject to long cables and complex electrical environments, and is extremely susceptible to the interference of the electrical environments. Under the condition of interference, misoperation of a moving part can be caused, and potential safety hazards are caused. Therefore, in the process of transmitting the motion signal, a safety current loop with strong anti-interference capability is provided to control the enabling signal of the motion controller, so that the malfunction can not be generated even if the motion controller is interfered in the process of transmitting the motion control signal.
For the key mode, the current loop can be driven as long as two parallel contacts are provided. For the joystick approach, driving such a safety current loop requires additional circuit design.
Chinese patent application CN101951253A discloses a joystick. The joystick includes a handle having a housing, the joystick further including: the induction electrode is arranged inside the shell and can form a capacitor with a human body outside the shell; and the control circuit is connected with the induction electrode and outputs a control signal to switch on the safety current loop when the capacitance of the capacitor reaches a threshold value.
For such a human body induction control lever, a design with a high sensitivity may be adopted in some applications to facilitate an operator to operate the control lever. However, in a very extreme case, when a plurality of fingers of a human hand leave the handle of the control lever at a very slow uniform speed (e.g., a uniform speed lower than 0.5 mm/s), a malfunction may occur, so that the safety current loop is always in a conducting state, thereby increasing the risk of the system.
Disclosure of Invention
In view of this, the present invention provides a reset circuit of a control lever, which is used to reset the control circuit of the control lever when a malfunction occurs, so as to recover the normal function, thereby reducing the risk of the system.
The invention provides a reset circuit for a control rod, which comprises: the time delay circuit, the time delay reset circuit, the reset time control circuit and the normally closed electronic switch are positioned between the control rod and the power supply; wherein,
the time delay circuit is used for timing the output duration of the control signal when the control rod outputs the control signal and outputting a reset trigger signal to the reset time control circuit when the output duration reaches the set safe time;
the delay reset circuit is used for resetting the timing of the delay circuit when the control rod outputs an invalid signal;
the reset time control circuit is used for controlling the electronic switch to be switched off when the delay circuit outputs a reset trigger signal, and controlling the electronic switch to be switched on when the switching-off duration reaches the set reset time.
Wherein the delay circuit comprises: the circuit comprises a first RC time delay circuit and a first comparison circuit with positive feedback; wherein,
the first RC time delay circuit comprises a first charge-discharge resistor and a first charge-discharge capacitor which are connected in series, wherein one end of the first charge-discharge resistor is connected with the output end of the control rod, and the other end of the first charge-discharge resistor is connected with the forward end of the first charge-discharge capacitor and the reverse input end of the first comparison circuit; the other end of the first charge-discharge capacitor is grounded;
and the output end of the first comparison circuit is used as the output end of the delay circuit.
The first comparison circuit includes: the circuit comprises a first comparator, a first voltage division circuit, a feedback circuit and a first pull-up resistor;
the reverse input end of the first comparator is connected with the forward end of the first charge-discharge capacitor and the non-control rod connecting end of the first charge-discharge resistor; the same-direction input end of the first comparator is respectively connected with the comparison voltage output end of the first voltage division circuit and the output end of the feedback circuit; the output end of the first comparator is respectively connected with one end of the first pull-up resistor and the input end of the feedback circuit, and the output end of the first comparator is used as the output end of the delay circuit; the other end of the first pull-up resistor is connected to a power supply.
Wherein, the time delay reset circuit includes: the circuit comprises an inverter, a second RC time delay circuit, a first switch tube and a discharge resistor; wherein,
the input end of the reverser is connected with the output end of the control rod;
the second RC time delay circuit comprises a second charge-discharge resistor and a second charge-discharge capacitor which are connected in series, wherein one end of the second charge-discharge resistor is connected with the output end of the reverser, and the other end of the second charge-discharge resistor is connected with the gate pole of the first switching tube and the forward end of the second charge-discharge capacitor; the other end of the second charge-discharge capacitor is grounded;
the drain electrode of the first switch tube is connected with the positive end of the first charge-discharge capacitor through the discharge resistor, and the source electrode of the first switch tube is grounded.
Wherein the reset time control circuit includes: the third RC delay circuit, the second comparison circuit and the inverter; wherein,
the third RC time delay circuit comprises a charging resistor and a third charging and discharging capacitor which are connected in series, wherein one end of the third charging and discharging capacitor is connected with the output end of the time delay circuit, and the other end of the third charging and discharging capacitor is respectively connected with one end of the charging resistor and the same-direction input end of the second comparison circuit; the other end of the charging resistor is connected with a power supply;
the output end of the second comparison circuit is connected with the input end of the inverter;
and the output end of the inverter is used as the output end of the reset time control circuit.
The second comparison circuit includes: the second comparator, the second voltage division circuit and the second pull-up resistor;
the same-direction input end of the second comparator is connected with the non-delay circuit connecting end of the third charge-discharge capacitor and the non-power supply connecting end of the charging resistor; the inverting input end of the second comparator is connected with the comparison voltage output end of the second voltage division circuit; the output end of the second comparator is respectively connected with one end of the second pull-up resistor and the input end of the inverter; the other end of the second pull-up resistor is connected to a power supply.
The electronic switch is a second switch tube, the source electrode of the second switch tube is connected with the power supply, the drain electrode of the second switch tube is connected with the control rod, and the gate electrode of the second switch tube is connected with the output end of the reset time control circuit.
The medical device provided by the invention comprises a control rod and a reset circuit of the control rod in any one of the specific implementation forms.
The medical equipment is as follows: an X-ray machine, a computed tomography CT apparatus or a magnetic resonance imaging MRI apparatus.
According to the scheme, the reset circuit utilizes the delay circuit to time the control signal output by the control rod, and informs the reset time control circuit to reset and control the power supply input into the control rod when the set safe time is reached, so that the risk brought to the system by misoperation can be avoided, and the safety of the system is improved.
Further, the reset circuit described above is implemented by using fewer commonly used electronic components, and thus the cost of the system is hardly increased.
In addition, by adopting the comparison circuit with positive feedback in the time delay circuit, the hysteresis comparison function of the comparator can be realized, and the misoperation of the comparator caused by the amplitude fluctuation of the output signal of the control rod is prevented.
And moreover, the RC time delay is adopted in the time delay reset circuit, so that the misoperation of the time delay reset circuit caused by the time sequence fluctuation of the output signal of the control rod can be compared.
Drawings
The foregoing and other features and advantages of the invention will become more apparent to those skilled in the art to which the invention relates upon consideration of the following detailed description of a preferred embodiment of the invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a reset circuit of a joystick according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the delay circuit and the delay reset circuit according to an example of the present invention.
Fig. 3 is a schematic diagram of the structure of the reset time control circuit and the electronic switch in one example of the present invention.
Fig. 4 is a timing chart of the entire reset circuit in the example shown in fig. 2 and 3.
Wherein the reference numbers are as follows:
101-time delay circuit
102-time delay reset circuit
103-reset time control circuit
104-electronic switch
20-operating lever
R1-first charging and discharging resistor
R2-first divider resistor
R3-second divider resistor
R4-feedback resistance
R5-first pull-up resistor
R6-pull-down resistor
R7-second charging and discharging resistor
R8-discharge resistor
R9-charging resistor
R10-third voltage dividing resistor
R11 fourth voltage dividing resistor
R12-second pull-up resistor
R13-third pull-up resistor
C1-first charging and discharging capacitor
C2-second charging and discharging capacitor
C3-third charging and discharging capacitor
U1-first comparator
U2-first inverter
U3-second comparator
U4-second inverter
V1-first switch tube
V2-second switch tube
VCC-power supply
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by referring to the following examples.
Fig. 1 is a schematic structural diagram of a reset circuit of a joystick according to an embodiment of the present invention. As shown in fig. 1, the reset circuit includes: a delay circuit 101, a delay reset circuit 102, a reset time control circuit 103, and a normally closed electronic switch 104 between the joystick 20 and the power source VCC.
The delay circuit 101 is configured to time an output duration of the control signal when the control lever 20 outputs the control signal, and output a reset trigger signal (e.g., output a falling edge transition) to the reset time control circuit 103 when the output duration of the control signal reaches a set safe time. The safety time is usually determined by the maximum permissible conduction time of the safety current loop.
The delay reset circuit 102 is used for resetting the timing of the delay circuit 101 when the joystick 20 outputs an invalid signal, so that the delay circuit 101 can restart the timing when the joystick 20 outputs a control signal again.
The reset time control circuit 103 is configured to control the electronic switch 104 to be turned off when the delay circuit 101 outputs a reset trigger signal, and control the electronic switch 104 to be turned on when an off duration reaches a set reset time. The reset time is usually determined according to the reset time required by the safety current loop, for example, if some safety current loops require a reset time of about 0.1s, the set reset time may be 0.1s, 0.09s, 0.11s, or the like.
The reset circuit avoids risks brought to the system by misoperation and increases the safety of the system.
When the reset circuit is implemented in detail, each component unit can have various specific implementation forms, and in order to reduce the system cost, the reset circuit can be implemented by only adopting a small number of common electronic elements.
The following describes a mode of implementation using a small number of commonly used electronic components, by way of example.
As shown in fig. 2 and fig. 3, fig. 2 is a schematic structural diagram of a delay circuit and a delay reset circuit according to an example of the present invention. Fig. 3 is a schematic diagram of the structure of the reset time control circuit and the electronic switch in one example of the present invention.
As shown in fig. 2, the delay circuit 101 includes: a first RC delay circuit and a first comparison circuit with positive feedback.
Wherein, this first RC delay circuit includes: a first charging and discharging resistor R1 and a first charging and discharging capacitor C1. One end of the first charge-discharge resistor R1 is connected to the output end of the control rod 20, the other end is connected to the positive end of the first charge-discharge capacitor C1, and the other end of the first charge-discharge capacitor C1 is grounded. The positive end of the first charging and discharging capacitor C1 is the output end of the first RC delay circuit, and is connected to the reverse input end of the first comparator U1 in the first comparator circuit as the input voltage of the first comparator circuit with positive feedback.
The first comparison circuit with positive feedback comprises: the circuit comprises a first comparator U1, a first voltage division circuit, a feedback circuit and a first pull-up resistor R5.
The positive input end of the first comparator U1 is respectively connected with the comparison voltage output end of the first voltage division circuit and the output end of the feedback circuit; the output end of the first comparator U1 is respectively connected with the pull-up resistor R5 and the input end of the feedback circuit, and the output end of the first comparator U1 is used as the output end of the delay circuit 101; the other end of the first pull-up resistor R5 is connected to a power supply VCC.
Specifically, the first voltage dividing circuit includes a first voltage dividing resistor R2 and a second voltage dividing resistor R3. One end of the first voltage-dividing resistor R2 is connected with a power supply VCC, the other end is connected with the second voltage-dividing resistor R3, and the other end of the second voltage-dividing resistor R3 is grounded. The power source VCC is divided by the first voltage dividing resistor R2 and the second voltage dividing resistor R3 to form a comparison voltage of the first comparator U1, and the comparison voltage is connected to the non-inverting input terminal of the first comparator U1.
The feedback circuit comprises a feedback resistor R4, one end of the feedback resistor R4 is connected to the output terminal of the comparator U1, and the other end is connected to the non-inverting input terminal of the first comparator U1.
One end of the first pull-up resistor R5 is connected to the power source VCC, and the other end is connected to the output terminal of the first comparator U1, for maintaining a high level output when the output of the first comparator U1 is at the high level.
The output terminal of the first comparator U1 is the output terminal of the delay circuit.
In practical application, when a human body approaches to the joystick, the joystick outputs a high level, and a high level signal is received by the first charging and discharging resistor R1 of the delay circuit 101, the first charging and discharging resistor R1 charges the first charging and discharging capacitor C1, and when the output voltage of the first charging and discharging capacitor C1 is higher than the voltage obtained by dividing the voltage by the voltage dividing resistors R2 and R3 (i.e., the comparison voltage of the first comparator U1 at the same-direction input end), the first comparator U1 outputs a falling edge pulse which jumps from the high level to the low level. The feedback resistor R4 realizes a hysteresis comparison function, and prevents the output signal of the joystick 20 from causing a malfunction of the first comparator U1 when amplitude fluctuation occurs.
As shown in fig. 2, the delay reset circuit 102 includes: the circuit comprises a first reverser U2, a second RC time delay circuit, a first switch tube V1, a pull-down resistor R6 and a discharge resistor R8.
Wherein the input end of the first inverter U2 is connected to the output end of the joystick 20.
The second RC delay circuit includes: a second charging and discharging resistor R7 and a second charging and discharging capacitor C2. One end of a second charging and discharging resistor R7 is connected with the output end of the first reverser U2, the other end of the second charging and discharging resistor R7 is connected with the positive end of the second charging and discharging capacitor C2, and the other end of the second charging and discharging capacitor C2 is grounded. The positive end of the second charging and discharging capacitor C2 is the output end of the second RC time delay circuit and is connected with the gate of the first switch tube V1.
The drain of the first switch tube V1 is connected to the forward end of the first charging and discharging capacitor C1 of the first RC delay circuit through a discharging resistor R8, and the source of the first switch tube V1 is grounded.
One end of the pull-down resistor R6 is connected to the input terminal of the first inverter U2, and the other end is grounded.
In practical applications, when the human body leaves the joystick 20, the joystick 20 outputs a low level, and the first inverter U2 outputs a high level. After the level passes through an RC time delay circuit formed by the second charging and discharging resistor R7 and the second charging and discharging capacitor C2, the first switching tube V1 is opened, so that the stored charges of the first charging and discharging capacitor C1 are released through the discharging resistor R8, and the timing reset of the time delay circuit is realized.
The second RC delay circuit can prevent the output signal of the control lever 20 from causing malfunction of the delay reset resistor when timing fluctuation occurs.
As shown in fig. 3, the reset time control circuit includes: a third RC delay circuit, a second comparison circuit and a second inverter U4.
Wherein the third RC delay circuit comprises: a third charging and discharging capacitor C3 and a charging resistor R9. One end of the third charging and discharging capacitor C3 is connected to the output end of the delay circuit 101, the other end of the third charging and discharging capacitor C3 is connected to the charging resistor R9, and the other end of the charging resistor R9 is connected to the power source VCC. The positive end of the third charging and discharging capacitor C3 is the output end of the third RC delay circuit, and is connected with the same-direction input end of the second comparator U3 in the second comparator circuit as the input voltage of the second comparator circuit.
The second comparing circuit includes a second comparator U3, a second voltage dividing circuit, and a second pull-up resistor R12.
The second voltage division circuit comprises a third voltage division resistor R10 and a fourth voltage division resistor R11. One end of the third voltage dividing resistor R10 is connected with a power supply VCC, the other end is connected with the fourth voltage dividing resistor R11, and the other end of the fourth voltage dividing resistor R11 is grounded. The voltage of the power source VCC is divided by the third voltage dividing resistor R10 and the fourth voltage dividing resistor R11 to form a comparison voltage of the second comparator U3, and the comparison voltage is connected to the inverting input terminal of the second comparator U3.
One end of the second pull-up resistor R12 is connected to the power source VCC, and the other end is connected to the output terminal of the second comparator U3, for maintaining the high level output when the output of the second comparator U3 is high level.
The input end of the second inverter U4 is connected with the output end of the second comparator U3, and the output end of the second inverter U4 is the output end of the reset time control circuit.
In this example, the reset time control circuit may further include a third pull-up resistor R13, one end of the third pull-up resistor R13 is connected to the power source VCC, and the other end is connected to the output terminal of the second inverter U4, for maintaining the high level output when the output of the second inverter U4 is high level.
As shown in fig. 3, the electronic switch 104 in this example may be a second switch tube V2, the source of the second switch tube V2 is connected to the power source VCC, the drain is connected to the control rod 20, and the gate is connected to the output terminal of the reset time control circuit 103, i.e., the output terminal of the second inverter U4.
In practical application, the reset trigger signal output by the delay circuit 101 is connected to the non-inverting input terminal of the second comparator U3 after passing through the charging resistor R9 and the third charging and discharging capacitor C3, at this time, the voltage at the non-inverting input terminal of the second comparator U3 is lower than the voltage at the inverting input terminal, the second comparator U3 outputs a low level, the second inverter U4 outputs a high level, the second switch tube V2 is turned off, and the power voltage of the control rod 20 is 0. Meanwhile, the charging resistor R9 charges the third charging/discharging capacitor C3, and when the voltage at the non-inverting input terminal is higher than the voltage at the inverting input terminal, the second switching tube V2 is turned on, and the control rod 20 is energized and restarted. The reset process is complete.
Fig. 4 shows a timing chart of the entire reset circuit in the example shown in fig. 2 and 3, as shown in fig. 4: sin is the output signal of the joystick 20. U1+, U1-, and U1out are the input voltage, the comparison voltage, and the output signal, respectively, of the delay circuit 101. U3+, U3-, and U3out are the input voltage, the comparison voltage, and the output signal, respectively, of the reset time control circuit 103. It can be seen that at the time point t1 to t2, since the charging time is shorter than the set safe time, the voltage of the capacitor does not reach the set value, and the first comparator U1 in the delay circuit 101 does not output the trigger signal. At time t3, the first comparator U1 of the delay circuit 101 outputs a trigger signal, and the second switch tube V2 cuts off the power supply to the joystick 20. Meanwhile, the voltage of the non-inverting input end of the second comparator U3 in the reset time control circuit 103 starts to be increased (namely, the voltage of the third charging and discharging capacitor C3), until the time t4, the voltage of the non-inverting input end of the second comparator U3 exceeds the voltage of the inverting input end of the second comparator U3, and the second switch tube V2 is connected with the power supply of the control rod, so that the reset is realized.
According to an embodiment of the present invention, the medical device comprises a joystick 20, and further comprises a reset circuit for the joystick in any of the above-described embodiments. Also, the medical device may be: an X-ray machine, a Computed Tomography (CT) apparatus, or a Magnetic Resonance Imaging (MRI) apparatus, etc.
The invention discloses a reset circuit for a control rod and medical equipment of a medical system. The reset circuit includes: the time delay circuit, the time delay reset circuit, the reset time control circuit and the normally closed electronic switch are positioned between the control rod and the power supply; the time delay circuit is used for timing the output duration of the control signal when the control rod outputs the control signal, and outputting a reset trigger signal to the reset time control circuit when the output duration of the control signal reaches the set safe time; the delay reset circuit is used for resetting the timing of the delay circuit when the control rod outputs an invalid signal; the reset time control circuit is used for controlling the electronic switch to be switched off when the delay circuit outputs a reset trigger signal, and controlling the electronic switch to be switched on when the switching-off duration reaches the set reset time. The technical scheme disclosed by the invention can reset the control circuit of the control rod when misoperation occurs, and the normal function is recovered.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A reset circuit for a joystick comprising: the time delay circuit (101), the time delay reset circuit (102), the reset time control circuit (103) and the normally closed electronic switch (104) are positioned between the control rod (20) and the power supply; wherein,
the delay circuit (101) is used for timing the output duration of the control signal when the control lever (20) outputs the control signal, and outputting a reset trigger signal to the reset time control circuit (103) when the output duration reaches the set safe time;
the delay reset circuit (102) is used for resetting the timing of the delay circuit (101) when the operating rod (20) outputs an invalid signal;
the reset time control circuit (103) is used for controlling the electronic switch (104) to be switched off when the delay circuit (101) outputs a reset trigger signal, and controlling the electronic switch (104) to be switched on when the switching-off duration reaches the set reset time.
2. The reset circuit according to claim 1, wherein the delay circuit (101) comprises: the circuit comprises a first RC time delay circuit and a first comparison circuit with positive feedback; wherein,
the first RC time delay circuit comprises a first charging and discharging resistor (R1) and a first charging and discharging capacitor (C1) which are connected in series, wherein one end of the first charging and discharging resistor (R1) is connected with the output end of the operating rod (20), and the other end of the first charging and discharging resistor (R1) is connected with the positive end of the first charging and discharging capacitor (C1) and the reverse input end of the first comparison circuit; the other end of the first charging and discharging capacitor (C1) is grounded;
and the output end of the first comparison circuit is used as the output end of the delay circuit (101).
3. The reset circuit of claim 2, wherein the first comparison circuit comprises: a first comparator (U1), a first voltage divider circuit, a feedback circuit, and a first pull-up resistor (R5);
the reverse input end of the first comparator (U1) is connected with the forward end of the first charging and discharging capacitor (C1), and the same-direction input end of the first comparator is connected with the comparison voltage output end of the first voltage division circuit and the output end of the feedback circuit; the output end of the first comparator (U1) is used as the output end of the delay circuit (101) and is connected with the input end of the feedback circuit and one end of the first pull-up resistor (R5); the other end of the first pull-up resistor (R5) is connected to a power supply.
4. The reset circuit of claim 2, wherein the delayed reset circuit (102) comprises: the circuit comprises an inverter (U2), a second RC time delay circuit, a first switch tube (V1) and a discharge resistor (R8); wherein,
the input end of the reverser (U2) is connected with the output end of the control rod (20);
the second RC time delay circuit comprises a second charge-discharge resistor (R7) and a second charge-discharge capacitor (C2) which are connected in series, wherein one end of the second charge-discharge resistor (R7) is connected with the output end of the inverter (U2), and the other end of the second charge-discharge resistor (R7) is connected with the gate of the first switching tube (V1) and the positive end of the second charge-discharge capacitor (C2); the other end of the second charging and discharging capacitor (C2) is grounded;
the drain electrode of the first switch tube (V1) is connected with the positive end of the first charging and discharging capacitor (C1) through the discharging resistor (R8), and the source electrode of the first switch tube (V1) is grounded.
5. The reset circuit according to claim 1, wherein the reset time control circuit (103) comprises: a third RC delay circuit, a second comparison circuit and an inverter (U4); wherein,
the third RC time delay circuit comprises a charging resistor (R9) and a third charging and discharging capacitor (C3) which are connected in series, wherein one end of the third charging and discharging capacitor (C3) is connected with the output end of the time delay circuit (101), and the other end of the third charging and discharging capacitor is connected with one end of the charging resistor (R9) and the same-direction input end of the second comparison circuit; the other end of the charging resistor (R9) is connected with a power supply;
the output end of the second comparison circuit is connected with the input end of the inverter (U4);
the output end of the inverter (U4) is used as the output end of the reset time control circuit (103).
6. The reset circuit of claim 5, wherein the second comparison circuit comprises: a second comparator (U3), a second voltage divider circuit, and a second pull-up resistor (R12);
the same-direction input end of the second comparator (U3) is used as the same-direction input end of the second comparison circuit, the reverse-direction input end of the second comparator is connected with the comparison voltage output end of the second voltage division circuit, and the output end of the second comparator is connected with one end of the second pull-up resistor (R12) and the input end of the inverter (U4); the other end of the second pull-up resistor (R12) is connected to a power supply.
7. The reset circuit according to claim 5 or 6, wherein the electronic switch (104) is a second switch transistor (V2), the source of the second switch transistor (V2) is connected to the power supply, the drain is connected to the control rod (20), and the gate is connected to the output of the reset time control circuit (103).
8. A medical device comprising a joystick (20), characterized by further comprising a reset circuit according to any of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110401566.1A CN103152019B (en) | 2011-12-07 | 2011-12-07 | A kind of reset circuit of control lever |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110401566.1A CN103152019B (en) | 2011-12-07 | 2011-12-07 | A kind of reset circuit of control lever |
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| CN103152019A CN103152019A (en) | 2013-06-12 |
| CN103152019B true CN103152019B (en) | 2016-01-27 |
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| CN201110401566.1A Active CN103152019B (en) | 2011-12-07 | 2011-12-07 | A kind of reset circuit of control lever |
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| DE102013217355B4 (en) * | 2013-08-30 | 2019-03-28 | Siemens Healthcare Gmbh | input unit |
| CN108199702A (en) * | 2018-03-02 | 2018-06-22 | 曙光信息产业(北京)有限公司 | Delay circuit |
| CN112272021B (en) * | 2020-11-05 | 2023-12-22 | 中国航空工业集团公司西安航空计算技术研究所 | Fault latch circuit for improving stability of onboard computer |
| CN117526915B (en) * | 2023-11-07 | 2024-09-06 | 河南翔宇医疗设备股份有限公司 | Circuit and method for turning on/off and resetting medical instrument |
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| CN1987732A (en) * | 2005-12-21 | 2007-06-27 | 联想(北京)有限公司 | One key on-and-off unit for computer and reset device and method |
| CN101566974A (en) * | 2009-05-25 | 2009-10-28 | 炬力集成电路设计有限公司 | System on a chip and starting method thereof |
| CN102237675A (en) * | 2010-04-26 | 2011-11-09 | 鸿富锦精密工业（深圳）有限公司 | Electronic device |
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| CN103152019A (en) | 2013-06-12 |
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