Power distribution circuit and ventilation treatment equipment adopting power distribution circuit

Abstract

The embodiment of the utility model provides a power distribution circuit and ventilation treatment equipment adopting the power distribution circuit, and belongs to the technical field of electromechanical control. The power distribution circuit is used for controlling power distribution of a load device, the load device comprises main load equipment and secondary load equipment, the power supply priority of the main load equipment is higher than that of the secondary load equipment, the power distribution circuit comprises a first sampling circuit and a turn-off control circuit, the first sampling circuit is used for collecting a sampling signal of main load equipment; and the turn-off control circuit receives a processing signal for sampling the sampling signal, and when the processing signal exceeds a preset threshold value, a first control device in the turn-off control circuit turns off the power supply of the secondary load equipment. The power distribution circuit can preferentially distribute power to a main load among a plurality of loads, the requirement for the rated power of a power supply is reduced to a certain extent, and the production cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of electromechanical control, in particular to a power distribution circuit and a ventilation treatment device using the power distribution circuit. Background Art

[0002] In circuit design, the distribution of power is very important, especially when the output power of the adapter is limited, and the key components need sufficient power to work, and other components also need a certain amount of power to operate. If power distribution is not performed, the normal operation of the key components cannot be guaranteed, resulting in the loss of function of the entire system. Utility Model Content

[0003] The purpose of the embodiment of the utility model is to provide a circuit, which can preferentially distribute power to a main load among multiple loads, and also reduce the requirements for the rated power of the power supply to a certain extent, thereby saving production costs.

[0004] In order to achieve the above-mentioned purpose, an embodiment of the utility model provides a power distribution circuit for controlling the power distribution of a load device, wherein the load device includes a main load device and a secondary load device, wherein the power supply priority of the main load device is higher than the power supply priority of the secondary load device, and the power distribution circuit includes: a first sampling circuit and a shutdown control circuit, wherein:

[0005] The first sampling circuit is used to collect sampling signals of the main load device; and

[0006] The shutdown control circuit receives a processing signal of the sampling signal, and when the processing signal exceeds a preset threshold, the first control device in the shutdown control circuit shuts off the power supply of the secondary load device.

[0007] Preferably, the first sampling circuit comprises a first resistor, one end of the first resistor is grounded, the other end is connected in series with the main load device, and the sampling signal is output from the connection end between the first resistor and the main load device.

[0008] Preferably, the power distribution circuit further includes an operational amplifier circuit, and the sampling signal is amplified by the operational amplifier circuit and connected to the input end of the shutdown control circuit.

[0009] Preferably, the power distribution circuit further includes a filter circuit, the filter circuit is connected between the operational amplifier circuit and the shutdown control circuit, and the filter circuit filters the AC signal in the sampled signal after passing through the operational amplifier circuit.

[0010] Preferably, the filter circuit is an RC filter circuit, wherein:

[0011] The sampling signal is amplified after passing through the operational amplifier circuit, and its output end is connected in series with the resistor and capacitor of the RC filter circuit and then grounded, so that the AC signal in the amplified signal is filtered;

[0012] The sampling signal is amplified after passing through the operational amplifier circuit. Its output end forms a processing signal after being connected in series with the resistor of the RC filter circuit and is connected to the shutdown control circuit, so that the DC signal in the amplified signal is transmitted to the shutdown control circuit.

[0013] Optionally, the first control device is a controllable switch tube, and the preset threshold is an action threshold of the controllable switch tube. The controllable switch tube includes but is not limited to a triode and a MOS tube.

[0014] Optionally, after the power supply of the secondary load device is turned off, the first sampling circuit continues to obtain the sampling signal of the primary load device, and when the processed signal of the sampling signal is lower than a preset threshold, the first control device turns on the power supply of the secondary load device.

[0015] Optionally, the power distribution circuit further includes a second control device, which controls the power supply of the secondary load device to be turned on or off, and the second control device and the first control device control the power supply of the secondary load device independently of each other.

[0016] Preferably, the second control device is a programmable control device.

[0017] Preferably, the power distribution circuit also includes a second sampling circuit, which is an AD sampling circuit. The second sampling circuit collects signals from the main load device, converts the sampled signals into digital signals, and transmits them to the second control device.

[0018] On the other hand, the utility model further provides a ventilation therapy device, including the power distribution circuit of the embodiment of the utility model, wherein the main load device is a fan module.

[0019] Optionally, the secondary load device in the ventilation therapy device is a humidification module, a heating circuit, a display module, or one or more of other external modules.

[0020] Through the above technical solution, when powering more than two load devices, the sampling signal of the main load device is sampled in real time. When the processed signal of the sampling signal exceeds the preset threshold range after being processed, it indicates that the main load device needs to allocate more power. When the rated power of the power supply is certain, the power supply of the secondary load device is shut down by shutting down the control circuit, so that sufficient power can be allocated to the main load device first to ensure the normal operation of the main load device. The power distribution circuit of the utility model can reduce the overall power supply demand of the load device by reasonably allocating the power supply demand of the main load device and the secondary load device under the premise of ensuring the normal operation of the main load device, thereby reducing the design requirements for the rated power of the power supply to a certain extent and saving production costs.

[0021] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. In the accompanying drawings:

[0023] Figure 1 It is a parallel connection method for allocating power of multiple loads in a fixed share in the prior art;

[0024] Figure 2 It is a radiation connection mode in the prior art in which multiple loads are allocated fixed power shares;

[0025] Figure 3 It is a hybrid connection mode in which multiple loads are allocated fixed power shares in the prior art;

[0026] Figure 4 This is a principle block diagram of a power distribution circuit according to an embodiment of the utility model;

[0027] Figure 5 It is a principle block diagram of a power distribution circuit of another embodiment of the utility model;

[0028] Figure 6 yes Figure 5 A circuit diagram of an embodiment of the invention; and

[0029] Figure 7 yes Figure 6 Flowchart of the circuit. DETAILED DESCRIPTION

[0030] The specific implementation of the embodiment of the utility model is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the utility model, and is not used to limit the embodiment of the utility model.

[0031] At present, the distribution of power is mostly fixed-share distribution, such as Figure 1-3 Three methods shown: parallel connection (such as Figure 1 As shown), radial connection (as Figure 2 As shown), hybrid connections (such as Figure 3 As shown in the figure, these methods have simple circuit structures, but when some loads in the circuit require sufficient power to work, it is not possible to flexibly distribute power between different loads. Therefore, redundancy must be reserved when designing the power supply, resulting in power waste. It is also necessary to select a power adapter with a larger rated power, which increases production costs.

[0032] The utility model provides a new power distribution circuit for controlling power distribution of a load device, wherein the load device comprises a main load device and a secondary load device, wherein the power supply priority of the main load device is higher than that of the secondary load device.

[0033] It should be noted that power supply priority refers to a descending order of different load devices according to their importance and usage priority during the operation of the electromechanical system. The purpose of this arrangement is to ensure that the most critical equipment is powered first in an emergency. The determination of power supply priority usually takes into account factors such as the importance of the equipment, maintenance time, bypass capacity, and location.

[0034] The following combination Figure 4 An embodiment of the power distribution circuit of the utility model is described. Figure 4 As shown, in this embodiment, a power distribution circuit is set between the main load device and the secondary load device, and the power distribution circuit includes a first sampling circuit and a shutdown control circuit, wherein the first sampling circuit is used to collect the sampling signal of the main load device; the sampling signal is processed to obtain a processed signal, the shutdown control circuit receives the processed signal of the sampling signal, and when the processed signal exceeds a preset threshold, the first control device in the shutdown control circuit shuts off the power supply of the secondary load device.

[0035] The power distribution circuit of this embodiment can be used for different types of load devices, such as medical devices, household electrical appliances, production devices, infrastructure devices, etc. The power distribution circuit is used for power allocation between core functional modules (main load devices) and auxiliary functional modules (secondary load devices). When the core functional module needs to operate at a higher power, the power supply of the auxiliary functional module is temporarily shut down to ensure the normal operation of the core functional module.

[0036] It should be noted that the main load device generally includes only one device, while the secondary load device may include multiple devices. The purpose of the present invention is to ensure that the main load device can be powered at the most basic level when the power supply power of the power adapter of the load device is limited, so that the product can guarantee the most basic functions. When the power supply of the main load device reaches the threshold, all secondary load devices are shut down.

[0037] In some embodiments, after the power supply to the secondary load device is turned off, the first sampling circuit continues to acquire the sampling signal, and when the sampling signal is lower than a preset threshold, the first control device turns on the power supply to the secondary load device.

[0038] exist Figure 4 In the figure, only one main load device and one secondary load device are shown, however, the present invention is not limited to this. Technicians can divide the number of power supply priority levels and the load devices corresponding to each power supply priority level according to actual needs, and place the power distribution circuit of the present invention between load devices with different power supply priority levels. When the sampling signal detected by the first sampling circuit exceeds the preset threshold, the first control device in the shutdown control circuit shuts off the power supply to all secondary load devices below the power supply level.

[0039] In some embodiments, for multiple power supply priority levels, multiple power distribution circuits are set between load devices at different power supply levels. When each power distribution circuit detects that a sampling signal exceeds a preset threshold range of the power distribution circuit of the corresponding power supply level, the power supply to the load devices of the secondary power supply level below the power supply level is shut off. If necessary, a power distribution circuit can be set between multiple load devices, that is, the power supply of each load device is controlled individually.

[0040] In some embodiments, technicians only prioritize power supply to the main load device. There is only one main load device. If there are multiple secondary load devices, the multiple secondary load devices are uniformly controlled to be turned on or off by a shutdown control circuit. When the processing signal of the sampling signal of the main load device exceeds a preset threshold, the shutdown control circuit shuts off the power supply to all secondary load devices.

[0041] In some implementations, a voltage at a non-grounded end of a grounded resistor (equivalent to the first resistor) is selected as a sampling point of the sampling signal.

[0042] It should be noted that technicians can select the type of sampling signal according to actual needs, such as sampling current or sampling power, and select a reasonable sampling point according to the type of sampling signal, and select the model of the first control device in the shutdown control circuit according to the output threshold range of the sampling signal, as long as it can indicate the working status of the main load equipment.

[0043] If necessary, the sampling signal can also be processed by an operational amplifier circuit to facilitate the selection of the first control device. In some embodiments, the first control device is a triode, and the preset threshold is the on-voltage of the triode. When the triode is in the on state, the secondary load device is powered off. If the sampling voltage cannot reach the on-voltage of the triode, the sampling voltage can be processed by an operational amplifier circuit to make it meet the on-voltage range of the triode.

[0044] It should be noted that the first control device is not limited to a triode, and can be any controllable switch device, such as a MOS tube or other controllable switch tube. The technicians only need to configure different drive circuits.

[0045] In some implementations, a filter circuit is provided between the operational amplifier circuit and the shutdown control circuit to filter out the AC signal in the signal after the sampling signal is amplified by the operational amplifier circuit. The filter circuit may be an RC filter circuit.

[0046] The utility model proposes another new power distribution circuit, such as Figure 5 As shown, in Figure 4 A software-assisted control function is added to the hardware control of the power distribution circuit. The software-assisted control includes converting the sampling signal of the main load device into a digital signal through an AD sampling device (a second sampling circuit), and transmitting the digital signal to the MCU control device (a second control device). The MCU control device is used to independently control the power supply on or off of the secondary load device.

[0047] In this embodiment, whether power allocation is required is determined according to the sampling signal obtained by the first sampling circuit of the hardware control part. During the period when the main load device is determined not to require power allocation, the shutdown control circuit of the hardware control part turns on the power supply of the secondary load device. At the same time, the software control part identifies whether the power supply of the secondary load device needs to be turned on or off according to the AD sampling result, and controls the power supply of the secondary load device according to the identification result. That is, the hardware control part and the software control part can independently control the turning on or off of the power supply of the secondary load device.

[0048] It should be noted that the sampling potential of the AD sampling of the software control part can be designed according to actual needs and can be different from the sampling potential of the hardware control part. In addition, the control logic of the software auxiliary control part can be set by program to meet the actual needs of the function. For example, the secondary load device is a humidity control device, and the control logic of the software auxiliary control part can control the start or stop of the humidity control device according to the function setting or the received control signal, so that the output humidity meets the function setting or user needs.

[0049] A circuit diagram of an implementation method of this embodiment is as follows Figure 6 The workflow diagram is shown in Figure 7 shown. Figure 6 The design requirements of the circuit shown are: the power supply Power is used to supply power to load 1 and load 2, load 1 is the main load device, and load 2 is the secondary load device; when load 1 needs to allocate a large amount of power, the power supply of the power supply Power to load 2 is turned off; when load 1 does not need power allocation, the processor (equivalent to the second control device) controls the power supply of load 2 to be turned on or off according to the control logic.

[0050] Figure 6 The circuit shown works as follows:

[0051] The working current of load 1 flows through resistor R10, so the voltage value of the non-grounded end of R10 can be used as a sampling voltage to reflect the current working power of load 1, so as to determine whether power allocation is needed at present. Therefore, it can be considered that when the sampling voltage is higher than a predetermined value, it means that load 1 needs a larger power supply and power allocation is required;

[0052] The sampled voltage is input to the operational amplifier U2B, and the voltage operation is adjusted by the operational amplifier U2B so that the sampled voltage meets the predetermined threshold range. U2B is an integrated operational amplifier, which is not limited to the parameters such as packaging, model, and withstand voltage, such as LM358, LM258, etc. Figure 6 The connection in the circuit is a common-mode amplifier circuit, and its voltage amplification factor is (1+R22 / R20). The specific resistance values ​​of R20 and R22 change with the current limit of load 1. For example, when the current limit of load 1 is 2A, R20=10k, R22=100k, and the amplification factor is 11 times;

[0053] After the sampling voltage passes through the operational amplifier circuit, its value meets the predetermined threshold range. However, in order to avoid malfunction of the transistor caused by AC noise, the AC noise in the sampling voltage is filtered out by the filter circuit. Figure 6R23 and C27 in the circuit form an RC filter, which uses the characteristics of capacitors to "block DC and pass AC" to filter the sampled voltage signal output by the op amp. In addition, R23 also plays a role in current limiting. Since the current signal output by the op amp is large, in order to prevent the breakdown and damage of the transistor Q20, the voltage of the input transistor Q20 is controlled through R23;

[0054] Q20 is the first control device. When the sampling voltage is large, it means that the instantaneous power of load 1 is large, and the voltage input to transistor Q20 through operational amplifier U2B is also large. If the conduction voltage of transistor Q20 is reached, Q20 is directly grounded, thereby shutting off the power supply of power to load 2, so as to ensure the normal operation of the main load device, i.e. load 1, and reduce the overall power supply demand of the system;

[0055] The processor is the second control device. When load 1 does not need power allocation, the processor, R24 and Q21 realize intelligent control of load 2. That is, when load 1 operates within the basic power range, it is not necessary to shut down the power supply of load 2 to ensure the normal operation of load 1. At this time, the program in the processor controls whether Q21 is turned on, thereby controlling whether the power supply Power supplies power to load 2.

[0056] It should be noted that the power supply Power is not limited to switching power supplies, adapters, power supply modules, etc.; Q20 and Q21 transistors are not limited to parameters such as packaging, model, material, and withstand voltage, for example, they can be MMBT2222A, NPN type, Vceo = 40V, Vcbo = 75V, Vebo = 6V, Ic = 600mA. You can select a suitable switch tube according to the selected load 1 current limit and the amplifier circuit amplification factor.

[0057] Figure 6 The working process of the circuit shown is as follows Figure 7 As shown, including:

[0058] After the system is powered on, turn on the main load equipment and the secondary load equipment (corresponding to Figure 6 Load 1 and Load 2 in );

[0059] Obtaining a sampling signal reflecting the working status of the main load device to determine whether the main load device is in a state requiring power regulation;

[0060] The sampled signal (corresponding to Figure 6 The voltage at the connection point between the load 1 and the resistor R10 in the input circuit is amplified and filtered, and then input into the first control device of the shutdown control circuit (corresponding to the voltage at the connection point between the load 1 and the resistor R10 in the input circuit). Figure 6 Transistor Q20 in the circuit);

[0061] The first control device determines whether the input processed sampling signal exceeds a preset threshold range (i.e. Figure 6 Whether the input voltage of transistor Q20 in the circuit exceeds its conduction voltage) controls whether to turn off the secondary load device (corresponding to Figure 6 The load 2) is powered. That is, when Figure 6 When the input voltage of transistor Q20 does not exceed its conduction voltage, both load 1 and load 2 work normally; when the input voltage of transistor Q20 exceeds its conduction voltage, the voltage loaded to load 2 is 0, thereby shutting off the power supply of load 2 to ensure the normal operation of load 1.

[0062] It should be noted that according to Figure 6 The purpose of the circuit, load 1 and load 2 can represent different load modules, not limited to inductive, resistive, and capacitive loads, such as fans, heating devices, transformers, etc.

[0063] Will Figure 6 When the circuit is used for ventilation therapy equipment, such as a ventilator, load 1 can be a fan module as the most important component, and load 2 can be a humidification module to make the output gas of the ventilator have a certain humidity. In addition, load 2 can also be other auxiliary function modules according to functional requirements. Its working process is as follows:

[0064] The ventilator works in T mode. When the expiratory pressure increases, the speed of the fan increases, and the driving current of the fan increases accordingly. The current flowing through the power sampling resistor R10 increases, so the voltage across R10 increases. When it exceeds the conduction voltage of the transistor Q20, the e-pole and c-pole of the transistor are connected, and the c-pole is directly grounded through the e-pole. At this time, the voltage of the c-pole is 0, and the subsequent units are turned off. At this time, the fan current I>2A, and the fan power is about 48W, thereby reducing the overall power supply power of the ventilator.

[0065] When the exhaled pressure decreases, the speed of the fan decreases, the driving current of the fan decreases, the current on the power sampling resistor R10 decreases, and the voltage across R10 decreases. When the voltage after passing through the operational amplifier U2B is less than the conduction voltage of the transistor Q20, the transistor Q20 is closed, and the closed circuit is reopened. The cycle continues, thereby realizing the distribution of power between the fan module and other modules.

[0066] In addition, in the time window when power allocation is not required, the processor controls the on and off of load 2 according to the preset process and state. For example, when a patient uses a ventilator during sleep at night, the patient's breathing is generally stable during sleep, and the fan module of the ventilator generally does not need a larger power supply. Therefore, the hardware control part generally does not control the power supply of the secondary load device to be turned off. However, in the actual use of the ventilator, for example, the heated breathing circuit as a secondary load device, if the heated breathing circuit is in contact with the body of the patient in the sleeping state for a long time, it is easy to cause scalds or burns to the contact part of the patient's body. Therefore, the software control part needs to intervene at this time to control the power supply of the heated breathing circuit as a secondary load device to be turned off, so as to ensure the safety and comfort of the use of the equipment.

[0067] Compared with the prior art, the beneficial effects of the utility model include:

[0068] 1. The hardware circuit is composed of discrete components, which is simple, effective and low-cost;

[0069] 2. The hardware control has good instantaneity, and the hardware and software are controlled together, with high reliability;

[0070] 3. Improve the safety and reliability of the ventilator products used, avoid the failure of the basic functions of the ventilator due to the failure of the fan to operate normally due to insufficient power, and to a certain extent reduce the rated power of the required power adapter, thereby reducing the production cost of the product.

[0071] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0072] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A power distribution circuit for controlling power distribution of a load device, wherein the load device comprises a primary load device and a secondary load device, wherein: The power supply priority of the main load device is higher than the power supply priority of the secondary load device, and is characterized by comprising: a first sampling circuit and a shutdown control circuit, wherein: The first sampling circuit is used to collect the sampling signal of the main load device; and The shutdown control circuit receives a processing signal of the sampling signal, and when the processing signal exceeds a preset threshold, a first control device in the shutdown control circuit shuts off the power supply of the secondary load device.

2. The power distribution circuit according to claim 1, characterized in that: The first sampling circuit includes a first resistor, one end of the first resistor is grounded, and the other end is connected in series with the main load device, and the connection end between the first resistor and the main load device outputs the sampling signal.

3. The power distribution circuit according to claim 2, characterized in that: It also includes an operational amplifier circuit, through which the sampling signal is amplified and connected to the input end of the shutdown control circuit.

4. The power distribution circuit according to claim 3, characterized in that: It also includes a filter circuit, which is connected between the operational amplifier circuit and the shutdown control circuit, and filters the AC signal in the sampling signal after passing through the operational amplifier circuit.

5. The power distribution circuit according to claim 4, characterized in that: The filter circuit is an RC filter circuit, wherein: The output end of the amplified signal of the sampling signal after passing through the operational amplifier circuit is connected in series with the resistor and capacitor of the RC filter circuit and then grounded, so that the AC signal in the amplified signal is filtered; The sampling signal is amplified by the operational amplifier circuit, and its output end is connected in series with the resistor of the RC filter circuit to form the processing signal and connected to the shutdown control circuit, so that the DC signal in the amplified signal is transmitted to the shutdown control circuit.

6. The power distribution circuit according to claim 1, characterized in that: The first control device is a controllable switch tube, and the preset threshold is an action threshold of the controllable switch tube.

7. The power distribution circuit according to any one of claims 1 to 6, characterized in that: After the power supply of the secondary load device is turned off, the first sampling circuit continues to obtain the sampling signal of the primary load device, and when the processed signal of the sampling signal is lower than the preset threshold, the first control device turns on the power supply of the secondary load device.

8. The power distribution circuit according to claim 1, characterized in that: It also includes a second control device, which controls the power supply of the secondary load device to be turned on or off, and the second control device and the first control device control the power supply of the secondary load device independently of each other.

9. The power distribution circuit according to claim 8, characterized in that: The second control device is a programmable control device.

10. The power distribution circuit according to claim 8 or 9, characterized in that: It also includes a second sampling circuit, which is an AD sampling circuit. The second sampling circuit collects the signal of the main load device, converts the sampled signal into a digital signal, and transmits it to the second control device.

11. A ventilation therapy device, characterized in that: It comprises the power distribution circuit as claimed in any one of claims 1 to 10, wherein the main load device is a fan module.

12. The ventilation therapy device according to claim 11, characterized in that The secondary load device is one or more of a humidification module, a heating module, and a display module.

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