Dual-power channel control circuit and medical equipment

Abstract

The utility model provides a dual-power channel control circuit and medical equipment, and the circuit comprises first to seventh switching circuits; the first switch circuit controls the on-off of the second switch circuit according to the in-place condition of the power supply signal and the key signal, and the fourth switch circuit controls the on-off of the third switch circuit according to the in-place condition of the first power supply signal, so as to achieve the power supply control of the first power supply. And the fifth switching circuit controls the sixth switching circuit according to the in-place condition of the first power supply signal, so as to control the on-off of the seventh switching circuit, thereby realizing the power supply control of the second power supply. Through the implementation of the utility model, the switching of the two power supplies can be realized by adopting a simple and easy-to-purchase device with a switch function, the overall cost is lower, and the device is high in replaceability, so that the production efficiency of products is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a dual-power supply channel control circuit and a medical device. Background Art

[0002] An operating bed generally needs to have a built-in backup power supply, that is, it can be powered by a built-in battery on the basis of power supply from the grid power supply. During the research and development process of operating bed products, a dual-power supply channel priority controller is generally used for switching power supply; because the current required during the operation of the operating bed is large, there are very few suitable integrated chip solutions on the market, and the delivery period and cost fluctuation of device supply are large. Also, because the packages of the devices are not consistent, they cannot be directly replaced, which is not conducive to the stable production and on-time delivery of products. Summary of the Utility Model

[0003] The utility model provides a dual-power supply channel control circuit and a medical device, aiming to solve the problems of poor device replaceability and poor product production stability of the dual-power supply channel controller in related technologies.

[0004] To solve the above technical problems, the first aspect of the utility model provides a dual-power supply channel control circuit, including: a first switch circuit, a second switch circuit, a third switch circuit, a fourth switch circuit, a fifth switch circuit, a sixth switch circuit and a seventh switch circuit; the second switch circuit is electrically connected to the first end of the first switch circuit and the third switch circuit respectively and is used for electrically connecting to an external load, the second end of the first switch circuit is electrically connected to the first power supply and the second power supply respectively and is used for electrically connecting to an external switch button, the second end of the third switch circuit is electrically connected to the first end of the fourth switch circuit and the first power supply, the third end of the third switch circuit is electrically connected to the second end of the fourth switch circuit, the fifth switch circuit is electrically connected to the sixth switch circuit and the first power supply respectively, and the seventh switch circuit is electrically connected to the sixth switch circuit, the second switch circuit and the second power supply respectively.

[0005] Further, the seventh switch circuit includes a seventh MOS transistor, an eighth MOS transistor, a fifteenth resistor and a sixteenth resistor; the first end of the seventh MOS transistor is electrically connected to the second power supply, the second end of the seventh MOS transistor is electrically connected to one end of the fifteenth resistor, one end of the sixteenth resistor and the first end of the eighth MOS transistor respectively, the third end of the seventh MOS transistor is electrically connected to the other end of the sixteenth resistor, the second end of the eighth MOS transistor and the other end of the fourteenth resistor respectively, the other end of the fifteenth resistor is electrically connected to the third end of the sixth MOS transistor, and the third end of the eighth MOS transistor is electrically connected to the second switch circuit.

[0006] Further, the dual - power - supply channel control circuit further includes a voltage regulator and an under - voltage protection circuit. The first end of the voltage regulator is electrically connected to the second power supply. The second end of the voltage regulator is used to be electrically connected to the switch button. The third end of the voltage regulator is electrically connected to the first end of the under - voltage protection circuit. The second end of the under - voltage protection circuit is electrically connected to the first power supply and the second power supply respectively. The third end of the under - voltage protection circuit is electrically connected to the sixth switch circuit.

[0007] Further, the under - voltage protection circuit includes a comparator, a ninth switch circuit, a first resistor voltage - dividing circuit, a second resistor voltage - dividing circuit, a self - locking circuit, and a seventeenth resistor;

[0008] The first resistor voltage - dividing circuit is electrically connected to the first input terminal of the comparator and the voltage regulator respectively. The second resistor voltage - dividing circuit is electrically connected to the second input terminal of the comparator and the second power supply respectively. The ninth switch circuit is electrically connected to the first power supply and the second input terminal of the comparator respectively. The output terminal of the comparator is electrically connected to the sixth switch circuit. The seventeenth resistor is electrically connected to the voltage regulator and the output terminal of the comparator respectively. The self - locking circuit is electrically connected between the second input terminal and the output terminal of the comparator.

[0009] In the second aspect of the present utility model, a medical device is provided, which includes the dual - power - supply channel control circuit as described in the first aspect of the present utility model.

[0010] As can be seen from the above description, in the present utility model, the first switch circuit controls the conduction and disconnection of the second switch circuit according to the presence or absence of the power supply signal and the external switch button signal, and the fourth switch circuit controls the conduction and disconnection of the third switch circuit according to the presence or absence of the first power supply signal, so as to realize the power supply control of the first power supply. And the fifth switch circuit controls the sixth switch circuit according to the presence or absence of the first power supply signal, and further controls the conduction and disconnection of the seventh switch circuit to realize the power supply control of the second power supply. Thus, the control circuit of the present utility model can realize the switching of two power supplies by using simple and easily - purchasable devices with switching functions, and can also respond to the control of the external switch button to turn off the two power supplies. The overall cost is low and the devices are highly replaceable, thereby effectively improving the production efficiency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of a dual - power - supply channel control circuit according to an embodiment of the present utility model;

[0012] Figure 2 is a circuit schematic diagram of a dual - power - supply channel control circuit according to an embodiment of the present utility model;

[0013] Figure 3 It is a schematic structural diagram of a data interface of a charging board according to an embodiment of the present invention;

[0014] Figure 4 It is a schematic structural diagram of another dual - power - channel control circuit according to an embodiment of the present invention;

[0015] Figure 5 It is a schematic circuit diagram of a voltage regulator according to an embodiment of the present invention;

[0016] Figure 6 It is a schematic circuit diagram of an under - voltage protection circuit according to an embodiment of the present invention. Specific embodiments

[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0018] In the related art, due to the problems of device replaceability of the dual - power - channel controller and poor product production stability, for this reason, an embodiment of the present invention provides a dual - power - channel control circuit.

[0019] As Figure 1 shown is a schematic structural diagram of a dual - power - channel control circuit provided by an embodiment of the present invention. The dual - power - channel control circuit includes: a first switch circuit 100, a second switch circuit 200, a third switch circuit 300, a fourth switch circuit 400, a fifth switch circuit 500, a sixth switch circuit 600, and a seventh switch circuit 700.

[0020] Specifically, the second switch circuit 200 is electrically connected to the first ends of the first switch circuit 100 and the third switch circuit 300 respectively and is used to be electrically connected to an external load 800. The second end of the first switch circuit 100 is electrically connected to the first power supply 900 and the second power supply 1000 respectively and is used to be electrically connected to an external switch button 1100. The second end of the third switch circuit 300 is electrically connected to the first end of the fourth switch circuit 400 and the first power supply 900. The third end of the third switch circuit 300 is electrically connected to the second end of the fourth switch circuit 400. The fifth switch circuit 500 is electrically connected to the sixth switch circuit 600 and the first power supply 900 respectively. The seventh switch circuit 700 is electrically connected to the sixth switch circuit 600, the second switch circuit 200 and the second power supply 1000 respectively. Among them, each switch circuit includes a switching device.

[0021] In this embodiment, the dual-power-channel control circuit controls the conduction and disconnection of the second switch circuit 200 through the first switch circuit 100 according to the presence or absence of two power supply signals and the signal of the external switch button 1100 to realize the output of the power supply. When the user needs to disconnect all power supplies, the second switch circuit 200 can be controlled to disconnect through the external switch button 1100. The fourth switch circuit 400 controls the conduction and disconnection of the third switch circuit 300 according to the presence or absence of the first power supply 900 signal to realize the power supply control of the first power supply 900. The fifth switch circuit 500 controls the sixth switch circuit 600 according to the presence or absence of the first power supply signal, and then the sixth switch circuit 600 controls the conduction and disconnection of the seventh switch circuit 700 to realize the power supply control of the second power supply 1000. Thus, the control circuit of this embodiment can realize the switching of two power supplies by using simple and easily purchasable devices with switching functions, and can also respond to the control of the external switch button 1100 to turn off the two power supplies. The overall cost is low and the device replaceability is strong, thereby effectively improving the production efficiency of the product.

[0022] As Figure 2 shown is the circuit schematic diagram of a dual-power-channel control circuit provided by this embodiment. Please refer to Figure 2, the first switching circuit 100 includes a first MOS transistor Q10, a first resistor R28, a second resistor R29, a third resistor R30, and a fourth resistor R31, and the second switching circuit 200 includes a second MOS transistor Q8, a fifth resistor R27, and a sixth resistor R26; a first power supply V_SPS is electrically connected to the first end of the first MOS transistor Q10 through the first resistor R28, a second power supply V_BAT is electrically connected to the first end of the first MOS transistor Q10 through the second resistor R29, a switch button 1100 is electrically connected to the first end of the first MOS transistor Q10 through the third resistor R30, one end of the fourth resistor R31 is electrically connected to the first end of the first MOS transistor Q10, the second end of the first MOS transistor Q10 is electrically connected to one end of the fifth resistor R27, the third end of the first MOS transistor Q10 and the other end of the fourth resistor R31 are both grounded, the other end of the fifth resistor R27 is respectively electrically connected to the first end of the second MOS transistor Q8 and one end of the sixth resistor R26, the second end of the second MOS transistor Q8 is respectively electrically connected to the other end of the sixth resistor R26, a seventh switching circuit 700, and a third switching circuit 300, and the third end of the second MOS transistor Q8 is used to be electrically connected to a load 800.

[0023] Further, please refer to Figure 2 , the third switching circuit 300 includes a third MOS transistor Q7, a seventh resistor R25, and an eighth resistor R24, and the fourth switching circuit 400 includes a fourth MOS transistor Q9, a ninth resistor R22, and a tenth resistor R23; one end of the seventh resistor R25 is respectively electrically connected to one end of the eighth resistor R24 and the first end of the third MOS transistor Q7, the other end of the seventh resistor R25 and the second end of the third MOS transistor Q7 are both electrically connected to the second end of the second MOS transistor Q8, the other end of the eighth resistor R24 is electrically connected to the first end of the fourth MOS transistor Q9, the third end of the third MOS transistor Q7 is respectively electrically connected to one end of the ninth resistor R22 and a first power supply V_SPS (900), the other end of the ninth resistor R22 is respectively electrically connected to one end of the tenth resistor R23 and the second end of the fourth MOS transistor Q9, and the other end of the tenth resistor R23 and the third end of the fourth MOS transistor Q9 are both grounded.

[0024] Further, please refer to Figure 2, the fifth switching circuit 500 includes a fifth MOS transistor Q5, an eleventh resistor R20, and a twelfth resistor R19. The sixth switching circuit 600 includes a sixth MOS transistor Q4, a thirteenth resistor R17, and a fourteenth resistor R18. One end of the eleventh resistor R20 is electrically connected to the first power supply V_SPS. The other end of the eleventh resistor R20 is respectively electrically connected to one end of the twelfth resistor R19 and the first end of the fifth MOS transistor Q5. The second end of the fifth MOS transistor Q5 is respectively electrically connected to the first end of the sixth MOS transistor Q4, one end of the thirteenth resistor, and one end of the fourteenth resistor R18. The other ends of the twelfth resistor R19, the thirteenth resistor R17, the third end of the fifth MOS transistor Q5, and the second end of the sixth MOS transistor Q4 are all grounded. The other end of the fourteenth resistor R18 and the third end of the sixth MOS transistor Q4 are both electrically connected to the seventh switching circuit 700.

[0025] Further, please refer to Figure 2 , the seventh switching circuit 700 includes a seventh MOS transistor Q3, an eighth MOS transistor Q6, a fifteenth resistor R14, and a sixteenth resistor R16. The first end of the seventh MOS transistor Q3 is electrically connected to the second power supply V_BAT(1000). The second end of the seventh MOS transistor Q3 is respectively electrically connected to one end of the fifteenth resistor R14, one end of the sixteenth resistor R16, and the first end of the eighth MOS transistor Q6. The third end of the seventh MOS transistor Q3 is respectively electrically connected to the other end of the sixteenth resistor R16, the second end of the eighth MOS transistor Q6, and the other end of the fourteenth resistor R18. The other end of the fifteenth resistor R14 is electrically connected to the third end of the sixth MOS transistor Q4. The third end of the eighth MOS transistor Q6 is electrically connected to the second switching circuit 200.

[0026] Specifically, in this embodiment, each switching circuit of the dual - power - channel control circuit may include a MOS transistor and a resistor voltage - dividing circuit. The resistor voltage - dividing circuit can provide a bias voltage for the MOS transistor to ensure that the MOS transistor is within the normal operating range. It can also play a role in preventing ESD static electricity, avoiding electrostatic damage when the gate and source are in a high - impedance state, and ensuring the safety of the device. The model of each MOS transistor can be adjusted according to actual needs to Figure 2Taking the MOS transistor shown as an example, among them, the MOS transistor in the first switching circuit 100 is an NMOS transistor, the MOS transistor in the second switching circuit 200 is a PMOS transistor, the MOS transistor in the third switching circuit 300 is a PMOS transistor, the MOS transistor in the fourth switching circuit 400 is an NMOS transistor, the MOS transistor in the fifth switching circuit 500 is an NMOS transistor, the MOS transistor in the sixth switching circuit 600 is an NMOS transistor, the MOS transistor in the seventh switching circuit 700 is a PMOS transistor, and the MOS transistor in the eighth switching circuit is a PMOS transistor. In addition, the second MOS transistor Q8 and the third MOS transistor Q7, and the seventh MOS transistor Q3 and the eighth MOS transistor Q6 in this embodiment are both arranged symmetrically, which can further prevent power backflow and ensure the stability of the circuit.

[0027] When the second power supply V_BAT is present and the battery voltage is normal (for example, V_BAT > 19V), and the first power supply V_SPS is also present, the gate-source voltage of the first MOS transistor Q10 is greater than its critical voltage (i.e., VGS > VGS_H), the drain-source of the first MOS transistor Q10 conducts, the VGS of the second MOS transistor Q8 < VGS_H, and the drain-source of the second MOS transistor Q8 conducts; the VGS of the fourth MOS transistor Q9 > VGS_H, the drain-source of the fourth MOS transistor Q9 conducts, the VGS of the third MOS transistor Q7 < VGS_H, and the drain-source of the third MOS transistor Q7 conducts; the VGS of the fifth MOS transistor Q5 > VGS_H, the drain-source of the fifth MOS transistor Q5 conducts, the VGS of the sixth MOS transistor Q4 < VGS_H, the drain-source of the sixth MOS transistor Q4 is disconnected, the VGS of the seventh MOS transistor Q3 and the eighth MOS transistor Q6 > VGS_H, and the drain-source of the seventh MOS transistor Q3 and the eighth MOS transistor Q6 are disconnected. Thus, the power output terminal V_SPS_BAT of the dual-power channel control circuit is connected to the first power supply V_SPS, and the first power supply V_SPS supplies power to the external load 800.

[0028] When the second power supply V_BAT is present and the battery voltage is normal (e.g., V_BAT > 19V), and the first power supply V_SPS is not present, the VGS of the first MOS transistor Q10 > VGS_H, the drain-source of the first MOS transistor Q10 conducts, the VGS of the second MOS transistor Q8 < VGS_H, and the drain-source of the second MOS transistor Q8 conducts; the VGS of the fourth MOS transistor Q9 < VGS_H, the drain-source of the fourth MOS transistor Q9 is disconnected, the VGS of the third MOS transistor Q7 > VGS_H, and the drain-source of the third MOS transistor Q7 is disconnected; the VGS of the fifth MOS transistor Q5 < VGS_H, the drain-source of the fifth MOS transistor Q5 is disconnected, the VGS of the sixth MOS transistor Q4 > VGS_H, and the drain-source of the sixth MOS transistor Q4 conducts, the VGS of the seventh MOS transistor Q3 and the eighth MOS transistor Q6 < VGS_H, and the drain-source of the seventh MOS transistor Q3 and the eighth MOS transistor Q6 conduct. Thus, the power output terminal V_SPS_BAT of the dual-power supply channel control circuit is connected to the second power supply V_BAT, and the second power supply V_BAT supplies power to the external load 800.

[0029] When the external switch button 1100 is pressed, the switch button signal STOP_OFF01 is at a low level. At this time, the VGS of the first MOS transistor Q10 < VGS_H, the drain-source of the first MOS transistor Q10 is disconnected, the VGS of the second MOS transistor Q8 > VGS_H, and the drain-source of the second MOS transistor Q8 is disconnected. Thus, the power output terminal V_SPS_BAT of the dual-power supply channel control circuit is disconnected from the first power supply V_SPS and the second power supply V_BAT, and stops supplying power to the external load 800.

[0030] In addition, in practical applications, the first power supply V_SPS can be obtained through external power interfaces such as the switching power supply interface J5 and the charging board power interface J4, the second power supply V_BAT can be obtained through the internal battery interface J2, and a fuse F1 can be set between the battery power supply and the seventh MOS transistor Q3 to prevent risks such as device damage caused by excessive current; a diode D1, a capacitor, and a resistor can also be set between the switching power supply interface J5 and the third MOS transistor Q7, and a diode D1 and a resistor can also be set between the second MOS transistor Q8 and the external load 800. Among them, the diode D1 can be used for clamping to prevent overvoltage from damaging the circuit, the capacitor can be used for filtering to provide a smooth voltage for the next-stage circuit, and the resistor can be used for stabilizing the circuit; the external load 800 can be the main control board of the device. Thus, the output terminal of the dual-power supply channel control circuit can be connected to the power interface J6 of the main control board to supply power to the main control board; in addition, each power supply signal and switch button signal can also be monitored in real time through the main control board, for example Figure 3Schematic diagram of the structure of the charging board data interface, which is connected to the battery interface J2 and the charging board data interface J1 through the data interface J3 of the main control board to monitor the situation of each power supply in real time.

[0031] As Figure 4 shown is a schematic diagram of the structure of another dual-power-channel control circuit provided in this embodiment. As Figure 5 shown is a circuit schematic diagram of a voltage regulator provided in this embodiment. Please refer to Figure 4 and Figure 5 , the dual-power-channel control circuit further includes a voltage regulator U1 (1200) and an undervoltage protection circuit 1300. The first end of the voltage regulator is electrically connected to the second power supply V_BAT. The second end of the voltage regulator U1 is used to be electrically connected to the switch button 1100. The third end of the voltage regulator U1 is electrically connected to the first end of the undervoltage protection circuit 1300. The second end of the undervoltage protection circuit 1300 is electrically connected to the first power supply V_SPS and the second power supply V_BAT respectively. The third end of the undervoltage protection circuit 1300 is electrically connected to the sixth switch circuit 600.

[0032] Specifically, in this embodiment, to ensure that the second power supply V_BAT can provide the required power supply for the external load 800 and prevent the external load 800 from malfunctioning due to insufficient power supply, undervoltage protection is also set for the second power supply V_BAT. The undervoltage protection circuit 1300 obtains the working voltage after being converted by the voltage regulator U1 from the second power supply V_BAT. Among them, the voltage regulator U1 can be a low-dropout linear regulator U1 (LDO), which can convert the voltage of the second power supply V_BAT into the voltage required by the undervoltage protection circuit 1300. The voltage regulator U1 is also controlled by the external switch button 1100. When the external switch button 1100 is pressed, the enable control pin CE of the voltage regulator U1 obtains a low level and shuts down, thereby turning off the undervoltage protection circuit 1300. The undervoltage protection circuit 1300 controls the sixth MOS transistor Q4 according to the presence or absence of the first power supply V_SPS and the voltage situation of the second power supply V_BAT, thereby realizing the power supply control of the second power supply V_BAT.

[0033] As Figure 6 shown is a circuit schematic diagram of an undervoltage protection circuit provided in this embodiment. Please refer to Figure 6, the undervoltage protection circuit 1300 includes a comparator U2A, a ninth switching circuit, a first resistor R28 voltage dividing circuit, a second resistor R29 voltage dividing circuit, a self-locking circuit, and a seventeenth resistor R2; the first resistor R28 voltage dividing circuit is electrically connected to the first input terminal of the comparator U2A and the voltage regulator U1 respectively, the second resistor R29 voltage dividing circuit is electrically connected to the second input terminal of the comparator U2A and the second power supply V_BAT respectively, the ninth switching circuit is electrically connected to the first power supply V_SPS and the second input terminal of the comparator U2A respectively, the output terminal of the comparator U2A is electrically connected to the sixth switching circuit 600, the seventeenth resistor R2 is electrically connected to the voltage regulator U1 and the output terminal of the comparator U2A respectively, and the self-locking circuit is electrically connected between the second input terminal and the output terminal of the comparator U2A. Among them, the first resistor R28 voltage dividing circuit includes a resistor R4 and a resistor R1, and the second resistor R29 voltage dividing circuit includes a resistor R3 and a resistor R7.

[0034] Further, please refer to Figure 6 , the self-locking circuit includes a diode D1 and an eighteenth resistor R8, the positive electrode of the diode D1 is electrically connected to the output terminal of the comparator U2A, the negative electrode of the diode D1 is electrically connected to one end of the eighteenth resistor R8, and the other end of the eighteenth resistor R8 is electrically connected to the second input terminal of the comparator U2A.

[0035] Further, please refer to Figure 6 , the ninth switching circuit includes a ninth MOS transistor Q2, a nineteenth resistor R9, and a twentieth resistor R10, one end of the first terminal of the ninth MOS transistor Q2 is electrically connected to the nineteenth resistor R9 and the twentieth resistor R10 respectively, the second terminal of the ninth MOS transistor Q2 is electrically connected to the second input terminal of the comparator U2A, the third terminal of the ninth MOS transistor Q2 is grounded, the other end of the nineteenth resistor R9 is electrically connected to the first power supply V_SPS, and the other end of the twentieth resistor R10 is grounded.

[0036] Specifically, in this embodiment, when the second power supply V_BAT is present and the battery voltage is abnormal (for example, V_BAT < 19V), and the first power supply V_SPS is not present, since the voltage at the inverting input terminal of the comparator U2A is less than the reference voltage at the non-inverting input terminal, the output terminal of the comparator U2A outputs a low level. As a result, VGS of the sixth MOS transistor Q4 < VGS_H, the drain-source of the sixth MOS transistor Q4 is disconnected, VGS of the seventh MOS transistor Q3 and the eighth MOS transistor Q6 > VGS_H, and the drain-source of the seventh MOS transistor Q3 and the eighth MOS transistor Q6 is disconnected. Thus, the power output terminal V_SPS_BAT of the dual-power supply channel control circuit is disconnected from the first power supply V_SPS and the second power supply V_BAT, and stops supplying power to the external load 800. When the second power supply V_BAT is present and the battery voltage is normal (for example, V_BAT > 19V), and the first power supply V_SPS is present, VGS of the ninth MOS transistor Q2 (NMOS transistor) > VGS_H, and the drain-source of the ninth MOS transistor Q2 is conducting. At this time, the voltage at the inverting input terminal of the comparator U2A is 0, the comparator U2A outputs a low level, the second power supply V_BAT is disconnected, and the first power supply V_SPS supplies power to the external load 800. Among them, the self-locking circuit and the seventeenth resistor R2 can be used to maintain the stability of the under-voltage protection circuit 1300.

[0037] The dual-power supply channel control circuit provided by the embodiment of the present invention controls the conduction and disconnection of the second switch circuit through the first switch circuit according to the presence or absence of the power supply signal and the external switch key signal, and controls the conduction and disconnection of the third switch circuit through the fourth switch circuit according to the presence or absence of the first power supply signal, so as to realize the power supply control of the first power supply. And the fifth switch circuit controls the sixth switch circuit according to the presence or absence of the first power supply signal, and further controls the conduction and disconnection of the seventh switch circuit to realize the power supply control of the second power supply. Thus, the control circuit of the present invention can realize the switching of two power supplies by using simple and easily available devices with switching functions, and can also respond to the control of the external switch key to turn off the two power supplies. The overall cost is low and the device replaceability is strong, thereby effectively improving the production efficiency of the product.

[0038] The embodiment of the present invention also provides a medical device, which includes the above-mentioned dual-power supply channel control circuit. Among them, the medical device can be an operating table.

[0039] It should be noted that the various embodiments in the content of the present invention are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0040] It should also be noted that in the content of the present utility model, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the content of the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined in the content of the present utility model can be implemented in other embodiments without departing from the spirit or scope of the content of the present utility model. Therefore, the content of the present utility model will not be limited to these embodiments shown in the content of the present utility model, but rather to the broadest scope consistent with the principles and novel features disclosed in the content of the present utility model.

Claims

1. A dual-power supply channel control circuit, characterized in that, Including: A first switch circuit, a second switch circuit, a third switch circuit, a fourth switch circuit, a fifth switch circuit, a sixth switch circuit, and a seventh switch circuit; The second switch circuit is electrically connected to the first end of the first switch circuit and the third switch circuit respectively and is used to be electrically connected to an external load. The second end of the first switch circuit is electrically connected to a first power supply and a second power supply respectively and is used to be electrically connected to an external switch button. The second end of the third switch circuit is electrically connected to the first end of the fourth switch circuit and the first power supply. The third end of the third switch circuit is electrically connected to the second end of the fourth switch circuit. The fifth switch circuit is electrically connected to the sixth switch circuit and the first power supply respectively. The seventh switch circuit is electrically connected to the sixth switch circuit, the second switch circuit, and the second power supply respectively.

2. The dual-power supply channel control circuit according to claim 1, wherein The first switch circuit includes a first MOS transistor, a first resistor, a second resistor, a third resistor, and a fourth resistor. The second switch circuit includes a second MOS transistor, a fifth resistor, and a sixth resistor; The first power supply is electrically connected to the first end of the first MOS transistor through the first resistor. The second power supply is electrically connected to the first end of the first MOS transistor through the second resistor. The switch button is electrically connected to the first end of the first MOS transistor through the third resistor. One end of the fourth resistor is electrically connected to the first end of the first MOS transistor. The second end of the first MOS transistor is electrically connected to one end of the fifth resistor. The third end of the first MOS transistor and the other end of the fourth resistor are both grounded. The other end of the fifth resistor is electrically connected to the first end of the second MOS transistor and one end of the sixth resistor respectively. The second end of the second MOS transistor is electrically connected to the other end of the sixth resistor, the seventh switch circuit, and the third switch circuit respectively. The third end of the second MOS transistor is used to be electrically connected to the load.

3. The dual-power supply channel control circuit according to claim 2, wherein The third switch circuit includes a third MOS transistor, a seventh resistor, and an eighth resistor. The fourth switch circuit includes a fourth MOS transistor, a ninth resistor, and a tenth resistor; One end of the seventh resistor is electrically connected to one end of the eighth resistor and the first end of the third MOS transistor respectively. The other end of the seventh resistor and the second end of the third MOS transistor are both electrically connected to the second end of the second MOS transistor. The other end of the eighth resistor is electrically connected to the first end of the fourth MOS transistor. The third end of the third MOS transistor is electrically connected to one end of the ninth resistor and the first power supply respectively. The other end of the ninth resistor is electrically connected to one end of the tenth resistor and the second end of the fourth MOS transistor respectively. The other end of the tenth resistor and the third end of the fourth MOS transistor are both grounded.

4. The dual-power supply channel control circuit according to claim 1, wherein The fifth switch circuit includes a fifth MOS transistor, an eleventh resistor, and a twelfth resistor. The sixth switch circuit includes a sixth MOS transistor, a thirteenth resistor, and a fourteenth resistor; One end of the eleventh resistor is electrically connected to the first power supply. The other end of the eleventh resistor is electrically connected to one end of the twelfth resistor and the first end of the fifth MOS transistor respectively. The second end of the fifth MOS transistor is electrically connected to the first end of the sixth MOS transistor, one end of the thirteenth resistor, and one end of the fourteenth resistor respectively. The other ends of the twelfth resistor, the thirteenth resistor, the third end of the fifth MOS transistor, and the second end of the sixth MOS transistor are all grounded. The other end of the fourteenth resistor and the third end of the sixth MOS transistor are both electrically connected to the seventh switching circuit.

5. The dual-power supply channel control circuit according to claim 4, wherein The seventh switching circuit includes a seventh MOS transistor, an eighth MOS transistor, a fifteenth resistor, and a sixteenth resistor; The first end of the seventh MOS transistor is electrically connected to the second power supply. The second end of the seventh MOS transistor is electrically connected to one end of the fifteenth resistor, one end of the sixteenth resistor, and the first end of the eighth MOS transistor respectively. The third end of the seventh MOS transistor is electrically connected to the other end of the sixteenth resistor, the second end of the eighth MOS transistor, and the other end of the fourteenth resistor respectively. The other end of the fifteenth resistor is electrically connected to the third end of the sixth MOS transistor. The third end of the eighth MOS transistor is electrically connected to the second switching circuit.

6. The dual-power supply channel control circuit according to claim 1, wherein, It further includes a voltage regulator and an under-voltage protection circuit. The first end of the voltage regulator is electrically connected to the second power supply. The second end of the voltage regulator is used to be electrically connected to the switch button. The third end of the voltage regulator is electrically connected to the first end of the under-voltage protection circuit. The second end of the under-voltage protection circuit is electrically connected to the first power supply and the second power supply respectively. The third end of the under-voltage protection circuit is electrically connected to the sixth switching circuit.

7. The dual-power supply channel control circuit according to claim 6, wherein The under-voltage protection circuit includes a comparator, a ninth switching circuit, a first resistor voltage-dividing circuit, a second resistor voltage-dividing circuit, a self-locking circuit, and a seventeenth resistor; The first resistor voltage-dividing circuit is electrically connected to the first input terminal of the comparator and the voltage regulator respectively. The second resistor voltage-dividing circuit is electrically connected to the second input terminal of the comparator and the second power supply respectively. The ninth switching circuit is electrically connected to the first power supply and the second input terminal of the comparator respectively. The output terminal of the comparator is electrically connected to the sixth switching circuit. The seventeenth resistor is electrically connected to the voltage regulator and the output terminal of the comparator respectively. The self-locking circuit is electrically connected between the second input terminal and the output terminal of the comparator.

8. The dual-power supply channel control circuit according to claim 7, wherein The self-locking circuit includes a diode and an eighteenth resistor. The positive electrode of the diode is electrically connected to the output terminal of the comparator. The negative electrode of the diode is electrically connected to one end of the eighteenth resistor. The other end of the eighteenth resistor is electrically connected to the second input terminal of the comparator.

9. The dual-power supply channel control circuit according to claim 7, wherein The ninth switching circuit includes a ninth MOS transistor, a nineteenth resistor, and a twentieth resistor. One end of the ninth MOS transistor is electrically connected to one end of the nineteenth resistor and the twentieth resistor respectively. The second end of the ninth MOS transistor is electrically connected to the second input terminal of the comparator. The third end of the ninth MOS transistor is grounded. The other end of the nineteenth resistor is electrically connected to the first power supply. The other end of the twentieth resistor is grounded.

10. A medical device, characterized in that, It includes the dual power supply channel control circuit according to any one of claims 1 to 9.

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