# US 11,079,133 B2 · Electronic control system for electrostatic precipitators connected in series

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- Number: US 11,079,133 B2
- Document ID: US11079133B2
- Status: Granted
- Kind: B2
- Application number: 16/476,067
- Filed: 2018-01-29
- Published: 2020-01-02
- Granted: 2021-08-03
- Earliest claimed: 2017-01-30
- Assignees: Clean Air Enterprise AG
- Applicants: Clean Air Enterprise AG
- Inventors: Rene Oberhaensli
- Web page: https://patentgrep.com/patent/US11079133B2

## CPC

- F24F 11/49: ensuring correct operation, e.g. by trial operation or configuration checks
- G05B 15/02: electric
- F24F 8/192: by electrical means, e.g. by applying electrostatic fields or high voltages
- F24F 11/54: using one central controller connected to several sub-controllers
- F24F 11/65: for selecting an operating mode
- F24F 11/88: Electrical aspects, e.g. circuits
- G05B 19/042: using digital processors (G05B19/05 takes precedence)
- B03C 3/68: Control systems therefor {(electricity supply or control systems for cleaning the electrodes B03C3/746, B03C3/763)}
- B03C 2201/32: Checking the quality of the result or the well-functioning of the device
- F24F 2110/64: Airborne particle content
- F24F 2203/00: Devices or apparatus used for air treatment
- G05B 2219/2614: HVAC, heating, ventillation, climate control
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)
- B03C: MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS (separating isotopes B01D59/00; combinations of magnetic or electrostatic separation with separation of solids by other means B03B, B07B)

## Abstract

The invention concerns an electrostatic precipitator comprising an ionisation stage, a collector stage and a power supply. The power supply comprises a first high-voltage power supply unit for applying a first DC high voltage to the ionization stage and a second high-voltage power supply unit for applying a second DC high voltage to the collector stage. The first high-voltage power supply unit is configured to operate the ionization stage current-controlled. A current sensor required for this is advantageously arranged in the return line carrying low voltage, for which purpose the first high-voltage power supply unit and the second high-voltage power supply unit are galvanically isolated from the mains connection and from each other.

## Claims

### Claim 1

An electronic control system for a number of electrostatic precipitators of a building ventilation system, the electronic control system comprising:
at least one master device and a plurality of node devices,
wherein
each of the plurality of node devices is coupled to a corresponding electrostatic precipitator,
the at least one master device and each node device having a respective computing unit,
each node device having a respective node configuration program,
at least one chain of node devices is connected to the at least one master device,
wherein in each chain of node devices a first node device is directly connected to the associated master device and the further node devices of the chain of node devices are each connected to a predecessor node device, so that the node devices of the chain are connected to one another in series,
the at least one master device being the predecessor of the first node device of the connected chain of node devices, and
a position number is assigned to each of the node devices,
and wherein, the computing unit of the at least one master device, is configured, in a configuration mode, to cause the computing unit of the first node device of each connected chain to execute its node configuration program:
wherein, each node configuration program of each node device is configured
to receive the position number of its predecessor and to assign itself a position number increased by the value 1 relative to the position number of its predecessor and to store the position number assigned to itself in its respective node device, and
to determine whether a subsequent node device is connected and,
if this is the case, to cause the computing unit of the subsequent node device to execute its respective node configuration program, and
if this is not the case, to transmit its position number to its predecessor node device, which in turn transmits it to its predecessor node device until the associated master device receives the position number from the first node device of the chain.

### Claim 2 (depends on 1)

The electronic control system according to claim 1, wherein each of the node devices has one or more sensors in order to detect a coding of the corresponding connected electrostatic precipitator, and each node's configuration program is additionally configured to determine the coding of the connected electrostatic precipitator from the output signal of the sensor or from the output signals of the sensors.

### Claim 3 (depends on 1)

The electronic control system according to claim 1, wherein at least one master device supplies the connected node devices with a supply voltage for the corresponding electrostatic precipitators, and each of the node devices has a galvanic isolating element for transmitting the supply voltage from the node device to the corresponding connected electrostatic precipitator.

### Claim 4 (depends on 2)

The electronic control system according to claim 2, wherein at least one master device supplies the connected node devices with a supply voltage for the corresponding electrostatic precipitators, and each of the node devices has a galvanic isolating element for transmitting the supply voltage from the node device to the corresponding connected electrostatic precipitator.

### Claim 5 (depends on 1)

The electronic control system according to claim 1, wherein each of the electrostatic precipitators has a predetermined size and comprises an ionization stage and a collector stage, and the control of each of the electrostatic precipitators is effected by presetting an ionization current flowing through the ionization stage and a DC voltage to be applied to the collector stage, wherein
the at least one master device is connectable to a building control device or is part of a building control device,
the at least one master device is configured to transmit a control signal transmitted from the building control device or a control signal derived therefrom to the node devices, and
each of the node devices is configured to determine, for the associated electrostatic precipitator, the ionization current to be set on the basis of the transmitted control signal, or the transmitted control signal and the size of the connected electrostatic precipitator or configured to determine the DC voltage to be applied to the collector on the basis of the transmitted control signal.

### Claim 6 (depends on 5)

The electronic control system according to claim 5, wherein the control signal transmitted to the node devices is a measure of the current air volume flow flowing through a ventilation duct in which the electrostatic precipitators are arranged.

### Claim 7 (depends on 2)

The electronic control system according to claim 2, wherein each of the electrostatic precipitators has a predetermined size and comprises an ionization stage and a collector stage, and the control of each of the electrostatic precipitators is effected by presetting an ionization current flowing through the ionization stage and a DC voltage to be applied to the collector stage, wherein
the at least one master device is connectable to a building control device or is part of a building control device,
the at least one master device is configured to transmit a control signal transmitted from the building control device or a control signal derived therefrom to the node devices, and
each of the node devices is configured to determine, for the associated electrostatic precipitator, the ionization current to be set on the basis of the transmitted control signal, or the transmitted control signal and the size of the connected electrostatic precipitator or configured to determine the DC voltage to be applied to the collector on the basis of the transmitted control signal.

### Claim 8 (depends on 7)

The electronic control system according to claim 7, wherein the control signal transmitted to the node devices is a measure of the current air volume flow flowing through a ventilation duct in which the electrostatic precipitators are arranged.

### Claim 9 (depends on 3)

The electronic control system according to claim 3, wherein each of the electrostatic precipitators has a predetermined size and comprises an ionization stage and a collector stage, and the control of each of the electrostatic precipitators is effected by presetting an ionization current flowing through the ionization stage and a DC voltage to be applied to the collector stage, wherein
the at least one master device is connectable to a building control device or is part of a building control device,
the at least one master device is configured to transmit a control signal transmitted from the building control device or a control signal derived therefrom to the node devices, and
each of the node devices is configured to determine, for the associated electrostatic precipitator, the ionization current to be set on the basis of the transmitted control signal, or the transmitted control signal and the size of the connected electrostatic precipitator or configured to determine the DC voltage to be applied to the collector on the basis of the transmitted control signal.

### Claim 10 (depends on 9)

The electronic control system according to claim 9, wherein the control signal transmitted to the node devices is a measure of the current air volume flow flowing through a ventilation duct in which the electrostatic precipitators are arranged.

### Claim 11 (depends on 4)

The electronic control system according to claim 4, wherein each of the electrostatic precipitators has a predetermined size and comprises an ionization stage and a collector stage, and the control of each of the electrostatic precipitators is effected by presetting an ionization current flowing through the ionization stage and a DC voltage to be applied to the collector stage, wherein
the at least one master device is connectable to a building control device or is part of a building control device,
the at least one master device is configured to transmit a control signal transmitted from the building control device or a control signal derived therefrom to the node devices, and
each of the node devices is configured to determine, for the associated electrostatic precipitator, the ionization current to be set on the basis of the transmitted control signal, or the transmitted control signal and the size of the connected electrostatic precipitator or configured to determine the DC voltage to be applied to the collector on the basis of the transmitted control signal.

### Claim 12 (depends on 11)

The electronic control system according to claim 11, wherein the control signal transmitted to the node devices is a measure of the current air volume flow flowing through a ventilation duct in which the electrostatic precipitators are arranged.