Multi-X-ray machine parallel power integration protection device

Abstract

The invention provides a multi-X-ray machine parallel power integration protection device. The device not only is used for controlling and protecting a single fixed medical X-ray machine, but also can monitor the operation of other fixed medical X-ray machines at the same time. When a plurality of fixed high-power medical X-ray machines are operated in parallel, the equipment can reduce the requirements of customers on a main power supply at a power grid side, protection equipment and infrastructures.

Description

Technical Field

[0001] The invention relates to the technical field of X-ray machines, and in particular to a power integrated protection device for multiple parallel-connected X-ray machines. Background Art

[0002] Fixed X-ray machines require a large amount of power from the grid when exposing. Usually, the power may exceed tens of kilowatts, or even more than one hundred kilowatts, but it remains in high-power working mode for a very short time. In most other time ranges, it remains in standby mode, at which time only a few kilowatts of power are required. The power control and protection unit of the X-ray machine must be designed according to the maximum power of the X-ray machine. When a customer has multiple high-power fixed X-ray machines, the connection structure of these machines is as follows: Figure 1 Typically, customers must update total power control and protection equipment and other infrastructure based on the sum of the maximum power of all high-power fixed X-ray machines.

[0003] The current power control and protection unit for multiple high-power fixed X-ray machines has some disadvantages. The current power control and protection unit is designed according to the maximum power of one fixed X-ray machine, which only considers the operating status and parameters of a single fixed X-ray machine. It does not consider the situation where customers need to install and operate multiple high-power fixed X-ray machines. The total power control and protection unit of the customer's power grid must be designed or updated for the sum of all the maximum powers of each fixed X-ray machine. This leads to very high costs for customers to upgrade their equipment and infrastructure, including applying for power expansion, updating power transformers, rewiring cables, updating power control and protection equipment, building new power distribution rooms, etc. Some customers with low budget plans even have to give up installing multiple X-ray machines. But in fact, the time an X-ray machine is exposed at high power is very short, even only a few milliseconds. In other time ranges, it remains in standby mode and only requires a few kilowatts. This leads to a huge waste of cost and time for customers to upgrade their infrastructure. Summary of the invention

[0004] In view of the above-mentioned deficiencies of the prior art, the present invention provides a power integrated protection device for multiple X-ray machines in parallel, which is not only used to control and protect a single fixed medical X-ray machine, but also can monitor the operation of other fixed medical X-ray machines at the same time. When multiple fixed high-power medical X-ray machines are operated in parallel, the device can reduce the customer's requirements for the total power supply, protection equipment and infrastructure on the grid side.

[0005] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0006] A power integrated protection device for multiple X-ray machines in parallel, comprising customer-side power grid infrastructure and equipment, a customer-side total power control and protection unit, multiple fixed X-ray machines, and power control and protection units corresponding to each fixed X-ray machine, wherein the device allows multiple X-ray machines to be exposed simultaneously when the total working current and total power are less than the protection value; when the X-ray machine is required to be exposed, its corresponding power control and protection unit checks whether other machines are being exposed at the same time; if so, the power control and protection unit requires the X-ray machine being exposed to provide corresponding parameters, and then calculates the required total current or power value, including the X-ray machine being exposed and the X-ray machine to be exposed; if the total current or power value is less than the protection limit value, the exposure is allowed and the corresponding parameters are sent to other X-ray machines; if the total current or power value is greater than the protection limit value, the exposure is prohibited until the total current or power value is less than the protection limit value.

[0007] Preferably, the specific steps of the working method of the device include: first, when the i-th X-ray machine is ready to perform exposure, in addition to checking its own exposure parameter conditions, it also sends an exposure request signal "Rex(i)" to its corresponding power control and protection unit; after receiving the exposure request, the power control and protection unit obtains its corresponding exposure and operating parameters, including: standby current i std (i), exposure current i exp (i), exposure voltage v exp (i), standby power P std (i), exposure power P exp (i), and then checks whether these parameters are less than the protection limit; at the same time, the power control and protection unit also checks the exposure status signal "Exp(j)" from other X-ray machines to confirm whether there are other X-ray machines that are performing exposure; if no other X-ray machine is performing exposure, and its own exposure and operating parameters are less than the protection limit, then the power control and protection unit sets the exposure enable signal "Enx(i)" to "1" to allow this exposure; if its own exposure and operating parameters are greater than the protection limit, the power control and protection unit sets the exposure enable signal "Enx(i)" to "0" to prohibit this exposure; if it is found that other X-ray machines are performing exposure, the power control and protection unit requests other units to obtain the exposure and operating parameters of the X-ray machines it controls and protects; after obtaining these parameters, the power control and protection unit calculates the total current and total power of all running X-ray machines, as shown below:

[0008] i total (t) = i std (1)+i exp (1)+i std (2)+i exp (2)+…+istd (n)+i exp (n)

[0009] P total (t) = P std (1)+P exp (1)+P std (2)+P exp (2)+…+P std (n)+P exp (n)

[0010] The power control and protection unit calculates the total current and total power and compares them with the protection limit I pT and P pT compare; if they are less than the protection value, the power control and protection unit sets the signal "Enx(i)" to "1" to allow this exposure; if they exceed the protection value, the power control and protection unit sets the signal "Enx(i)" to "0" to prohibit this exposure; then the query is cyclically performed until the exposure operation conditions are met, and then the exposure enable signal "Enx(i)" is set to "1" to allow this exposure; within the exposure time range, the signal "Exp(i)" is set to "1" and is set to "0" after the exposure is completed.

[0011] Beneficial effect: When multiple high-power fixed X-ray machines are operated in parallel, the new power control and protection unit designed by the present invention can control and protect a single high-power X-ray machine itself, and output the operating status information to the power control and protection units of other X-ray machines, such as Figure 2 In addition, it also monitors the operating status of other X-ray machines to control the exposure of the machine, thereby reducing the power requirements on the customer side grid and reducing the investment in power equipment and infrastructure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural diagram of multiple fixed X-ray machines connected in parallel.

[0013] Figure 2 This is a structural diagram of multiple stationary X-ray machines connected in parallel with a new power control and protection unit.

[0014] Figure 3 It is a schematic diagram of the parallel structure of multiple fixed X-ray machines with new power control and protection units and the protection signal relationship diagram.

[0015] Figure 4 Exposure signal control logic diagram for the power control and protection unit. DETAILED DESCRIPTION

[0016] The present invention is further explained below with reference to examples.

[0017] First, define the following variables:

[0018] i std (i): standby current of the i-th X-ray machine in standby mode (non-exposure mode);

[0019] i exp (i): exposure current of the i-th X-ray machine in high power mode (exposure mode);

[0020] v exp (i): exposure voltage of the i-th X-ray machine;

[0021] P std (i): standby power of the i-th X-ray machine in standby mode;

[0022] P exp (i): exposure power of the i-th X-ray machine in exposure mode;

[0023] I p (i): protection current value of the i-th X-ray machine;

[0024] P p (i): protection power value of the i-th X-ray machine;

[0025] i total (t): total current value of all Xray machines;

[0026] P total (t): total power value of all Xray machines;

[0027] I pT : Current protection value of the customer-side power grid;

[0028] P pT : Power protection value of the customer side power grid;

[0029] E xp (i): Exposure status signal of the i-th X-ray machine. "1" means the machine is exposing, "0" means the machine is not exposing;

[0030] R ex (i): Exposure request signal of the i-th X-ray machine. "1" means the machine is requesting exposure, "0" means the machine has no exposure request;

[0031] E nx (i): Exposure enable signal of the i-th X-ray machine. “1” means the machine is allowed to expose, and “0” means the machine is not allowed to expose.

[0032] The present invention designs a new power control and protection unit for the situation where multiple high-power fixed X-ray machines are operated in parallel, which can control and protect a single high-power X-ray machine itself and output the operating status information to the power control and protection units of other X-ray machines, such as Figure 2 In addition, it also monitors the operating status of other X-ray machines to control the exposure of the machine, thereby reducing the power requirements on the customer side grid and reducing the investment in power equipment and infrastructure.

[0033] Each X-ray machine is equipped with a power control and protection unit. This unit can protect the X-ray machine according to the working status of its own X-ray machine and the working status of other X-ray machines, reducing the requirements on the power grid side. The power control and protection unit is implemented as follows:

[0034] The design of the power control and protection unit allows multiple X-ray machines to work in high power mode at the same time when the total operating current and total power are less than the protection value. When the X-ray machine is required to perform exposure, the power control and protection unit should check whether there are other machines performing exposure at the same time. If so, the power control and protection unit should require the machine being exposed to provide the corresponding parameters, and then calculate the required total current or power value, including the machine being exposed and the machine to be exposed. If the total current or power value is less than the protection limit, the exposure should be allowed and the corresponding parameters should be sent to other machines. If the total current or power value is greater than the protection limit, the exposure should be prohibited until the total current or power value is less than the protection limit.

[0035] This method allows multiple high-power fixed X-ray machines to expose simultaneously at a certain moment according to power and protection limits. Figure 3 The main connections of several high power stationary X-ray machines are shown. These machines are equipped with a new power control and protection unit. The unit is connected between the customer's power grid and the stationary X-ray machine.

[0036] The power control and protection unit has not only a logic signal interface, but also a communication interface for exchanging exposure and operating parameters between multiple X-ray machines, as well as a communication interface with the local workstation.

[0037] Figure 4 The control logic flow chart of the power control and protection unit when an X-ray machine is performing an exposure is shown.

[0038] First, when an X-ray machine (the i-th machine) is ready to expose, in addition to checking its own exposure parameter conditions, it should send an exposure request signal "Rex(i)" to its own power control and protection unit. After receiving the exposure request, the unit needs to obtain its corresponding exposure and operating parameters, including: standby current i std (i), exposure current iexp (i), exposure voltage v exp (i), standby power P std (i), exposure power P exp (i), etc., and then check whether these parameters are less than the protection limit. At the same time, the unit also checks the exposure status signal "Exp(j)" from other X-ray machines to confirm whether there are other X-ray machines performing exposure. If there are no other X-ray machines performing exposure, and its own exposure and operating parameters are less than the protection limit, then the unit should set the exposure enable signal "Enx(i)" to "1" to allow this exposure. If its own exposure and operating parameters are greater than the protection limit, the unit should set the exposure enable signal "Enx(i)" to "0" to prohibit this exposure. If it is found that other X-ray machines are performing exposure, the power control and protection unit should request other units to obtain the exposure and operating parameters of the X-ray machines it controls and protects. After obtaining these parameters, the unit should calculate the total current and total power of all running machines as shown below:

[0039] i total (t) = i std (1)+i exp (1)+i std (2)+i exp (2)+…+i std (n)+i exp (n)

[0040] P total (t) = P std (1)+P exp (1)+P std (2)+P exp (2)+…+P std (n)+P exp (n)

[0041] After the power control and protection unit calculates the total current and total power, it compares them with the protection limit I pT and P pT Compare. If they are less than the protection value, the unit shall set the signal "Enx(i)" to "1" to allow this exposure. If they exceed the protection value, the unit shall set the signal "Enx(i)" to "0" to prohibit this exposure. Then loop the query until the exposure operation conditions are met, and then set the exposure enable signal "Enx(i)" to "1" to allow this exposure. Within the exposure time range, the signal "Exp(i)" is set to "1" and is set to "0" after the exposure ends.

[0042] In this method, at a certain moment, under the condition that the exposure parameters allow, multiple fixed X-ray machines are allowed to expose at the same time. This method can improve the utilization rate of all X-ray machines of the customer. In actual applications, X-ray machines will not use maximum power for exposure in most cases. When using low power for exposure, if the total current and total power of all parallel machines are less than the protection limit, multiple X-ray machines may be allowed to expose at the same time. The total power control and protection equipment and infrastructure on the customer's grid side do not have to be designed or updated based on the maximum power sum of all X-ray machines. Customers can flexibly adjust the power and protection limits according to their actual situation, allowing less than the sum of the maximum power of all X-ray machines. This can also greatly save customers' investment in this regard. In this method, the power control and protection unit has a communication interface for exchanging exposure parameters and operating parameters, which makes its design slightly more complicated than the first method.

Claims

1. A power integrated protection device for multiple parallel X-ray machines, comprising customer-side power grid infrastructure and equipment, a customer-side total power control and protection unit, multiple fixed X-ray machines, and power control and protection units corresponding to each fixed X-ray machine, characterized in that: The device allows multiple X-ray machines to be exposed simultaneously when the total operating current and total power are less than the protection value; when the X-ray machine is required to be exposed, its corresponding power control and protection unit checks whether other machines are being exposed at the same time; if so, the power control and protection unit requires the X-ray machine being exposed to provide corresponding parameters, and then calculates the required total current or power value, including the X-ray machine being exposed and the X-ray machine to be exposed; if the total current or power value is less than the protection limit, the exposure is allowed and the corresponding parameters are sent to other X-ray machines; if the total current or power value is greater than the protection limit, the exposure is prohibited until the total current or power value is less than the protection limit.

2. The power integrated protection device for multiple X-ray machines in parallel according to claim 1, characterized in that: The specific steps of the working method of the device include: first, when the i-th X-ray machine is ready to perform exposure, in addition to checking its own exposure parameter conditions, it also sends an exposure request signal "Rex(i)" to its corresponding power control and protection unit; after receiving the exposure request, the power control and protection unit obtains its corresponding exposure and operating parameters, including: standby current i std (i), exposure current i exp (i), exposure voltage v exp (i), standby power P std (i), exposure power P exp (i), and then checks whether these parameters are less than the protection limit; at the same time, the power control and protection unit also checks the exposure status signal "Exp(j)" from other X-ray machines to confirm whether other X-ray machines are performing exposure; if no other X-ray machine is performing exposure, and its own exposure and operating parameters are less than the protection limit, then the power control and protection unit sets the exposure enable signal "Enx(i)" to "1" to allow this exposure; if its own exposure and operating parameters are greater than the protection limit, the power control and protection unit sets the exposure enable signal "Enx(i)" to "0" to prohibit this exposure; if it is found that other X-ray machines are performing exposure, the power control and protection unit requests other units to obtain the exposure and operating parameters of the X-ray machines it controls and protects; after obtaining these parameters, the power control and protection unit calculates the total current and total power of all running X-ray machines, as shown below: i total (t)=i std (1)+i exp (1)+i std (2)+i exp (2)+…+i std (n)+i exp (n) P total (t)=P std (1)+P exp (1)+P std (2)+P exp (2)+…+P std (n)+P exp (n) The power control and protection unit calculates the total current and total power and compares them with the protection limit I pT and P pT compare; if they are less than the protection value, the power control and protection unit sets the signal "Enx(i)" to "1" to allow this exposure; if they exceed the protection value, the power control and protection unit sets the signal "Enx(i)" to "0" to prohibit this exposure; then the query is cyclically performed until the exposure operation conditions are met, and then the exposure enable signal "Enx(i)" is set to "1" to allow this exposure; within the exposure time range, the signal "Exp(i)" is set to "1" and is set to "0" after the exposure is completed.

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