CN219980506U - Power supply switching control circuit and medical instrument - Google Patents

Abstract

The utility model discloses a power switching control circuit and a medical device. The power switching control circuit includes: a first MOS tube, a second MOS tube and a diode. The gate of the first MOS tube is electrically connected to a wired power supply. The first MOS tube The drain of the tube is electrically connected to the battery power supply; the gate of the second MOS tube is electrically connected to the wired power supply, and the source of the second MOS tube is electrically connected to the source of the first MOS tube; the anode of the diode is electrically connected to the wired power supply. The cathode of the diode is electrically connected to the drain of the second MOS transistor and the load respectively. When the utility model uses a wired power supply for power supply, the first MOS tube and the second MOS tube are both in a cut-off state, so that the power supply path of the battery power supply is cut off. At this time, the battery power supply energy will not be consumed to extend the service life of the battery power supply. The body diode of the first MOS transistor is cut off, so that there is no charging path in the power switching control circuit, thereby avoiding reverse charging of the battery power supply, thereby extending the service life of the battery power supply.

Description

Power switching control circuit and medical equipment

Technical field

The utility model relates to the technical field of medical equipment, and in particular to a power switching control circuit and medical equipment.

Background technique

Nowadays, foot controllers are widely used in medical equipment. The foot controller is connected to the medical equipment. When performing surgery, the doctor steps on the foot controller, and the foot controller converts the force of the doctor's step into a driving signal. The drive signal is transmitted to the control device through the foot controller and its connecting cable to control the medical device and adjust the power of the medical device.

The power supply modes used by existing foot controllers include host wired connection power supply and battery power supply. When the foot controller is powered by a wired power supply, due to the difference in voltage between the wired power supply and the battery power supply, the foot controller may not automatically switch to the wired power supply. At this time, the foot controller is still powered by the battery power supply and consumes battery energy. , the power supply is stopped until the battery power is consumed to a certain extent, resulting in a shortened battery life; and, when the foot controller is switched to wired power supply, because the foot controller is not designed to prevent reverse charging, the wired The power supply reversely charges the battery power supply at the same time, and the battery power supply uses dry batteries, which causes the battery to swell and damage, and shortens the service life of the battery power supply.

Utility model content

The main purpose of this utility model is to provide a power switching control circuit and medical equipment, aiming at reducing the service life of the battery power supply due to untimely power switching and reverse charging of the battery power supply when the existing foot controller is powered by a wired power supply. technical issues.

In order to achieve the above purpose, the present utility model proposes a power switching control circuit. The power switching control circuit includes:

A first MOS transistor, the gate of the first MOS transistor is electrically connected to the wired power supply, and the drain of the first MOS transistor is electrically connected to the battery power supply;

a second MOS transistor, the gate of the second MOS transistor is electrically connected to the wired power supply, and the source of the second MOS transistor is electrically connected to the source of the first MOS transistor;

A diode, the anode of the diode is electrically connected to the wired power supply, and the cathode of the diode is electrically connected to the drain of the second MOS transistor and the load respectively.

Further, the first MOS transistor and the second MOS transistor are both PMOS transistors.

Further, the power switching control circuit further includes a first resistor;

The wired power supply is electrically connected to the gate of the first MOS transistor and the gate of the second MOS transistor respectively through the first resistor.

Further, the power switching control circuit further includes a second resistor;

One end of the second resistor is electrically connected to the first resistor, the gate of the first MOS transistor and the gate of the second MOS transistor respectively, and the other end is connected to ground.

Further, the power switching control circuit further includes a first capacitor;

One end of the first capacitor is electrically connected to the first resistor, the gate of the first MOS transistor, and the gate of the second MOS transistor respectively, and the other end is connected to ground.

Further, the power switching control circuit further includes a second capacitor;

One end of the second capacitor is electrically connected to the wired power supply and the anode of the diode, and the other end is connected to ground.

Further, the power switching control circuit further includes a third capacitor;

One end of the third capacitor is electrically connected to the cathode of the diode, the drain of the second MOS transistor and the load respectively, and the other end is connected to ground.

Further, the power switching control circuit further includes a fourth capacitor;

One end of the fourth capacitor is connected to the cathode of the diode, the drain of the second MOS transistor and the load respectively, and the other end is connected to ground.

Further, the load includes a foot controller of a medical device.

The utility model also provides a medical device, which includes the aforementioned power switching control circuit and a foot controller.

The technical solution of this utility model is that when the wired power supply is used for power supply, the first MOS tube Q1 and the second MOS tube Q2 are both in a cut-off state, so that the power supply path of the battery power supply is cut off. At this time, the battery power supply energy will not be consumed to extend the battery power supply. service life. Moreover, when a wired power supply is used, the wired power supply supplies power to the load through the anti-reverse connection diode D1. Since the first MOS transistor Q1 and the second MOS transistor Q2 are both in a cut-off state, there is no power supply through the first MOS transistor Q1 and the second MOS transistor Q2. The two MOS transistors Q2 form a charging path. At the same time, because the body diode of the first MOS transistor Q1 is reversely connected, the body diode of the first MOS transistor Q1 is turned off, so that there is no power supply through the first MOS transistor Q1 when the wired power supply is supplied. The body diode and the body diode of the second MOS transistor Q2 form a charging path, which can realize the anti-kickback function of the power switching control circuit and avoid reverse charging of the battery power supply, so as to extend the service life of the battery power supply and avoid accidents. Damage to the foot controller due to reverse charging.

Description of the drawings

Figure 1 is a schematic circuit structure diagram of an embodiment of the power switching control circuit of the present invention.

Figure 2 is a schematic structural diagram of the medical device of the present invention.

Explanation of reference numbers:

The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some of the embodiments of the present utility model, not all of them. Example. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present utility model.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between various components in a specific posture (as shown in the accompanying drawings). The relative position relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In addition, descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions in various embodiments can be combined with each other, but it must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that such a combination of technical solutions does not exist. , nor is it within the protection scope required by this utility model.

The utility model proposes a power switching control circuit.

Referring to Figure 1, Figure 1 is a schematic circuit structure diagram of an embodiment of the power switching control circuit of the present invention.

In the embodiment of the present invention, as shown in Figure 1, the power switching control circuit includes a first MOS transistor Q1, a second MOS transistor Q2 and a diode D1.

Wherein, the gate G of the first MOS transistor Q1 is electrically connected to the wired power supply ZJ, and the drain D of the first MOS transistor Q1 is electrically connected to the battery power supply VBATF;

The gate G of the second MOS transistor Q2 is electrically connected to the wired power supply, and the source S of the second MOS transistor Q2 is electrically connected to the source S of the first MOS transistor Q1;

The anode of the diode D1 is electrically connected to the wired power supply, and the cathode of the diode D1 is electrically connected to the drain D and the load of the second MOS transistor Q2 respectively. That is, the output terminal Vout of the power switching control circuit is electrically connected to the load, where the load includes a foot controller of the medical device.

Among them, the first MOS transistor Q1 and the second MOS transistor Q2 are both PMOS transistors, and the turn-on voltage Ugs(on) of the PMOS transistor is -1.5V. Since the power consumption of the PMOS tube is very low, only a few tens of millivolts, it can achieve low power consumption of the power switching control circuit and further extend the service life of the battery power supply. At the same time, the cost of the PMOS tube is low, which can reduce the power switching control circuit. cost. The rated voltage of the battery power supply is 6V, the maximum voltage of the battery power supply is about 6.5V and less than 6.5V, and the voltage of the wired power supply is 5V.

In this embodiment, when a wired power supply is used for power supply, the 5V wired power supply supplies power to the load through the anti-reverse connection diode D1. At the same time, the gate of the first MOS transistor Q1 and the gate of the second MOS transistor Q2 are approximately A high level of 5V, since the maximum voltage of the battery power supply is about 6.5V, and the voltages of the source of the first MOS transistor Q1 and the source of the second MOS transistor Q2 are less than 6.5V, therefore, the first MOS transistor Q1 and the second MOS transistor Q2 Neither of the two MOS tubes Q2 has Ugs ≤ -1.5V. Therefore, no matter what the voltage difference between the host power supply (wired power supply) and the battery power supply is, when the wired power supply is supplied, the first MOS tube Q1 and the second MOS tube Q2 are both In the cut-off state, the power supply path of the battery power supply is cut off. At this time, the battery power supply energy will not be consumed to extend the service life of the battery power supply.

Moreover, when a wired power supply is used for power supply, since the first MOS transistor Q1 and the second MOS transistor Q2 are both in a cut-off state, there is no charging path formed through the first MOS transistor Q1 and the second MOS transistor Q2. The body diode (also called a parasitic diode) of a MOS transistor Q1 is reversely connected, and the body diode (also called a parasitic diode) of the first MOS transistor Q1 is cut off, so that the wired power supply does not pass through the first MOS transistor Q1 The body diode of the second MOS transistor Q2 and the body diode of the second MOS transistor Q2 form a charging path, which can realize the anti-kickback function of the power switching control circuit and avoid reverse charging of the battery power supply, so as to extend the service life of the battery power supply and avoid Damage to the foot controller due to reverse charging.

When the wired power supply is disconnected, the gate G of the first MOS transistor Q1 is at a low level and the gate G of the second MOS transistor Q2 is at a low level. The battery power is conducted through the body diode of the first MOS transistor Q1. is turned on, so that the source S of the first MOS transistor Q1 is at a low level and the source S of the second MOS transistor Q2 is at a high level, and then the first MOS transistor Q1 and the second MOS transistor Q2 are both in a conductive state. The battery power supplies power to the load through the first MOS transistor Q1 and the second MOS transistor Q2.

Further, in one embodiment, referring to FIG. 1 , the power switching control circuit further includes a first resistor R1 , through which the wired power supply is connected to the gate G of the first MOS transistor Q1 and the second resistor R1 respectively. The gate G of the MOS transistor Q2 is electrically connected.

Preferably, referring to Figure 1, the power switching control circuit further includes a second resistor R2; one end of the second resistor R2 is connected to the first resistor R1, the gate G of the first MOS transistor Q1 and the second MOS transistor Q1. The gate G of tube Q2 is electrically connected, and the other end is grounded.

In this embodiment, the voltage of the gate G of the first MOS transistor Q1 and the gate G of the second MOS transistor Q2 can be reduced through the voltage division of the first resistor R1. The resistance of the second resistor is greater than the resistance of the first resistor, and through the voltage division of the first resistor R1 and the second resistor R2, the gate G of the first MOS transistor Q1 and the gate of the second MOS transistor Q2 can be further reduced. G voltage.

Preferably, referring to Figure 1, the power switching control circuit further includes a first capacitor C1; one end of the first capacitor C1 is connected to the first resistor R1, the gate G of the first MOS transistor Q1 and the second MOS transistor Q1 respectively. The gate G of tube Q2 is electrically connected, and the other end is grounded.

In another embodiment, referring to Figure 1, the power switching control circuit further includes a second capacitor C2; one end of the second capacitor C2 is electrically connected to the wired power supply and the anode of the diode D1 respectively, and the other end is connected to ground. .

In another embodiment, referring to Figure 1, the power switching control circuit further includes a third capacitor C3; one end of the third capacitor C3 is connected to the cathode of the diode D1 and the drain of the second MOS transistor Q2 respectively. D and the load are electrically connected, and the other end is grounded.

Preferably, referring to Figure 1, the power switching control circuit further includes a fourth capacitor C4; one end of the fourth capacitor C4 is connected to the cathode of the diode D1, the drain D of the second MOS transistor Q2 and the load, and the other end is grounded.

In this embodiment, when a wired power supply is used for power supply, the 5V wired power supply supplies power to the load through the anti-reverse connection diode D1. At the same time, through the voltage division of the first resistor R1 and the second resistor R2 (R2>>R1), The gate of the first MOS tube Q1 and the gate of the second MOS tube Q2 are given a high level of about 5V. Since the maximum voltage of the battery power supply is about 6.5V, the source of the first MOS tube Q1 and the second MOS The source voltage of tube Q2 is less than 6.5V. Therefore, neither the first MOS tube Q1 nor the second MOS tube Q2 has Ugs ≤ -1.5V. Therefore, no matter the voltage difference between the host power supply (wired power supply) and the battery power supply is How much, when the wired power supply is supplied, the first MOS transistor Q1 and the second MOS transistor Q2 are both in a cut-off state, so that the power supply path of the battery power supply is cut off. At this time, the battery power supply energy will not be consumed to extend the service life of the battery power supply.

Moreover, when a wired power supply is used for power supply, since the first MOS transistor Q1 and the second MOS transistor Q2 are both in a cut-off state, there is no charging path formed through the first MOS transistor Q1 and the second MOS transistor Q2. The body diode of a MOS transistor Q1 is reversely connected, and the body diode of the first MOS transistor Q1 is turned off, so that when the wired power supply is supplied, there is no charging through the body diode of the first MOS transistor Q1 and the body diode of the second MOS transistor Q2. The condition of the path can then realize the anti-backlash function of the power switching control circuit to avoid reverse charging of the battery power supply, thereby extending the service life of the battery power supply and avoiding damage to the foot controller due to reverse charging.

When the wired power supply is disconnected, the gate G of the first MOS transistor Q1 is low level and the gate G of the second MOS transistor Q2 is low level through the second resistor R2, and the battery power passes through the first MOS transistor Q2. The body diode of the tube Q1 is turned on, so that the source S of the first MOS tube Q1 is at a low level and the source S of the second MOS tube Q2 is at a high level, and then the first MOS tube Q1 and the second MOS tube Q2 are all in a conductive state, and the battery power supplies power to the load through the first MOS transistor Q1 and the second MOS transistor Q2.

The utility model also proposes a medical device. The medical device includes a power switching control circuit and a foot controller. The specific structure of the power switching control circuit refers to the above embodiments. Since this foot controller adopts the features of all the above embodiments, All technical solutions, therefore, also have all the beneficial effects brought by the technical solutions of the above embodiments, and will not be described again here.

Referring to FIG. 2 , the medical instrument 100 includes a foot controller 110 , a host computer 120 and a surgical tool 130 . The foot controller 110 is connected to the wired power supply ZJ and the battery power supply VBATF respectively, that is to say, the power switching control circuit of the foot controller 110 111 is electrically connected to the wired power supply ZJ and the battery power supply VBATF respectively, the surgical tool 130 is electrically connected to the host 120, and the working state of the surgical tool 130 can be controlled through the foot controller 110. In this embodiment, the power supply modes used by the foot controller 110 include wired power supply and battery power supply. When the foot controller 110 is powered by wired power supply, the power supply path of the battery power supply VBATF is cut off, and the battery power will not be consumed at this time. VBATF energy, and can realize the anti-recoil function to avoid reverse charging of the battery power supply VBATF, so as to extend the service life of the battery power supply VBATF and avoid damage to the foot controller 110 due to reverse charging.

The medical instrument 100 may be a radio frequency surgical device, a plasma surgical device, an ultrasonic surgical device, etc., and the corresponding surgical knife 130 may be a radio frequency scalpel, plasma scalpel, ultrasonic scalpel, etc.

It should be noted that the technical solutions of the various embodiments of the present invention can be combined with each other, but it must be based on the realization by those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that this The combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the description and drawings of the present utility model may be directly or indirectly applied to other related technologies. fields are all equally included in the scope of patent protection of this utility model.

Claims (10)

1. A power switching control circuit, characterized in that the power switching control circuit includes: A first MOS transistor, the gate of the first MOS transistor is electrically connected to the wired power supply, and the drain of the first MOS transistor is electrically connected to the battery power supply; a second MOS transistor, the gate of the second MOS transistor is electrically connected to the wired power supply, and the source of the second MOS transistor is electrically connected to the source of the first MOS transistor; A diode, the anode of the diode is electrically connected to the wired power supply, and the cathode of the diode is electrically connected to the drain of the second MOS transistor and the load respectively. 2. The power switching control circuit of claim 1, wherein the first MOS transistor and the second MOS transistor are both PMOS transistors. 3. The power switching control circuit of claim 1, wherein the power switching control circuit further includes a first resistor; The wired power supply is electrically connected to the gate of the first MOS transistor and the gate of the second MOS transistor respectively through the first resistor. 4. The power switching control circuit of claim 3, wherein the power switching control circuit further includes a second resistor; One end of the second resistor is electrically connected to the first resistor, the gate of the first MOS transistor and the gate of the second MOS transistor respectively, and the other end is connected to ground. 5. The power switching control circuit of claim 3, wherein the power switching control circuit further includes a first capacitor; One end of the first capacitor is electrically connected to the first resistor, the gate of the first MOS transistor, and the gate of the second MOS transistor respectively, and the other end is connected to ground. 6. The power switching control circuit of claim 1, wherein the power switching control circuit further includes a second capacitor; One end of the second capacitor is electrically connected to the wired power supply and the anode of the diode, and the other end is connected to ground. 7. The power switching control circuit of claim 1, wherein the power switching control circuit further includes a third capacitor; One end of the third capacitor is electrically connected to the cathode of the diode, the drain of the second MOS transistor and the load respectively, and the other end is connected to ground. 8. The power switching control circuit of claim 7, wherein the power switching control circuit further includes a fourth capacitor; One end of the fourth capacitor is connected to the cathode of the diode, the drain of the second MOS transistor and the load respectively, and the other end is connected to ground. 9. The power switching control circuit according to any one of claims 1 to 8, wherein the load includes a foot controller of a medical device. 10. A medical device, characterized in that the medical device includes the power switching control circuit and a foot controller according to any one of claims 1 to 9.