GB2459883A - Over-temperature protection system for a braking resistor - Google Patents
Over-temperature protection system for a braking resistor Download PDFInfo
- Publication number
- GB2459883A GB2459883A GB0808390A GB0808390A GB2459883A GB 2459883 A GB2459883 A GB 2459883A GB 0808390 A GB0808390 A GB 0808390A GB 0808390 A GB0808390 A GB 0808390A GB 2459883 A GB2459883 A GB 2459883A
- Authority
- GB
- United Kingdom
- Prior art keywords
- braking resistor
- resistor
- temperature
- control circuit
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004065 semiconductor Substances 0.000 claims abstract description 4
- 230000006378 damage Effects 0.000 abstract description 3
- 238000013021 overheating Methods 0.000 abstract 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/047—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a temperature responsive switch
-
- H02P29/0088—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
- H02P29/68—Controlling or determining the temperature of the motor or of the drive based on the temperature of a drive component or a semiconductor component
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
- H02P3/22—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor by short-circuit or resistive braking
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stopping Of Electric Motors (AREA)
Abstract
A temperature sensor 6 monitors the temperature of a braking resistor 2, and when the temperature exceeds a threshold control circuit 5 breaks the braking current path which includes the braking resistor, preventing damage to the resistor and its surroundings from overheating. Thermal sensor 6 can be a bimetallic switch. Control circuit 5 may be powered from the voltage applied to the braking resistor and comprises a semiconductor switch such as transistor 7 as a switching element. The braking resistor can be coupled across the DC link of a variable speed drive 3 where it dissipates regenerated energy from a motor 4.
Description
An over-temperature Drotection system for a brakinQ resistor This invention relates to an over-temperature protection system for braking resistors used for dissipating energy fed back to variable speed drives from rotating motors or the like.
There are currently at least two ways in which energy from rotating motors fed back to variable speed drives is dissipated. In the first of these, called regeneration, the energy is transferred back to the mains line via a controllable power circuit in the variable speed drive. This is complicated and requires more components and hence can expensive and less reliable than simple systems.
In a second way power control circuitry is used to direct the energy into a resistor for dissipation as heat. If the control circuitry fails the resistor may become so hot that it becomes a hazard to the surrounding environment which can result in destruction of the circuitry and housing, and is a potential fire hazard.
The usual way to provide protection against these problems is to use a thermal sensing device mounted on the resistor which provides an output to a contactor or similar switching device to remove the power to the whole system in an over temperature condition. For high Ingress Protection applications it is necessary to provide a sealed enclosure for the contactor which is expensive and hence undesirable.
The present invention arose in an attempt by the inventor to mitigate the above mentioned problems.
According to the invention there is provided an over-temperature protection system comprising a temperature sensor for sensing the temperature of a braking resistor to provide an input to a control circuit. This control circuit provides a control signal to a switching element for breaking a circuit, including the resistor, in the event of a temperature threshold being exceeded.
Preferably, the temperature sensor is thermay coupled to the resistor. n alternative embodiments, the sensor could be an infra red sensing device separated from the resistor.
Preferably, the temperature sensor is a bimetaHic strip type sensor as they are low cost and readily available with well defined switching temperatures. Where the switching element is a semiconductor device, the invention is particu'arly advantageous because it provides a way of eliminating arcing when the DC current passing through the braking resistor is switched off.
Preferably, the control circuit is powered by the vo'tage applied by the variable speed drive to the braking resistor. This is advantageous because it avoids the cost and complexity of additional wiring between the resistor and variable speed drive or the cost and complexity of providing an external power supply. The voltage applied to the braking resistor by the variable speed drive is often a pulse width modulated signal and the control circuit has to operate correctly with this type of supply voltage.
A specific embodiment of the invention will now be described, by way of example only, with reference to the drawing in which: Figure 1 shows a braking resistor circuit in accordance with the invention.
As is shown in figure 1, an over-temperature protection system (1) comprises a braking resistor (2) coupled across a switched connection to the DC link of a variable speed drive (3). The variable speed drive (3) is coupled to an AC motor (4) and provides thereto three driving voltage phases. Coupled across the resistor (2) is a control circuit (5). A bimetallic therma' switch (6) is mounted on the resistor (2) to ensure a good thermal path therebetween. The thermal switch (6)is responsive to temperature to open at a temperature threshold. This threshold is dependent upon the temperature at which damage to the resistor or surroundings would occur. The thermal switch provides an output to the control circuit (5) which indicates if the threshold has been crossed.
The control circuit (5) provides a control signal to the base of a transistor (7) which is coupled by its collector lead to the resistor (2) and by its emitter lead to back to the DC ink of the variab'e speed drive (3). The transistor (7) acts as a switching e'ement such that when the therma' switch is open the transistor breaks the path between the braking resistor (2) and the DC ink of the variab'e speed drive (3) to thereby prevent further current flow and heating of the resistor (2). The use of the transistor (7) as the switching &ement avoids moving contacts which cou'd be burnt out by arcing due to the typica' DC voRage applied by the variable speed dnve (3).
Claims (7)
- Claims 1. An over-temperature protection system for a braking resistor comprising a temperature sensor for sensing a temperature of a braking resistor to provide an input to a contro' circuit which control circuit providing a control signal to a switching element for breaking a circuit including the resistor in the event of a temperature threshold being exceeded.
- 2. A system as claimed in claim 1 wherein the braking resistor receives current from a motor to be braked.
- 3. A system as claimed in claim 2 wherein the temperature sensor is thermally connection to the braking resistor.
- 4. A system as claimed in any preceding claim wherein the temperature sensor is a bimetallic switch.
- 5. A switch as claimed in any preceding claim wherein the control circuit is powered by the voltage applied to the braking resistor.
- 6. A switch as claimed in any preceding claim wherein the switching element is a semiconductor switching e'ement.
- 7. A switch as claimed in dam 6 wherein the switching e'ement is a transistor.Amendments to the claims have been filed as follows: 1. An over-temperature protection system for a braking resistor comprising a temperature sensor for sensing a temperature of a braking resistor to provide an input to a control circuit which control circuit providing a control signal to a semiconductor switching element for breaking a circuit including the resistor in the event of a temperature threshold being exceeded wherein the control circuit is powered by the voltage applied to the braking resistor wherein the braking resistor receives current from a motor to be braked.2. A system as claimed in claim 1 wherein the temperature sensor is thermally connection to the braking resistor.3. A system as claimed in any preceding claim wherein the temperature sensor is a bimetallic switch. (\J4. A switch as claimed in claim 1 wherein the switching element is a transistor. a)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0808390.9A GB2459883B (en) | 2008-05-09 | 2008-05-09 | An over-temperature protection system for a braking resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0808390.9A GB2459883B (en) | 2008-05-09 | 2008-05-09 | An over-temperature protection system for a braking resistor |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0808390D0 GB0808390D0 (en) | 2008-06-18 |
| GB2459883A true GB2459883A (en) | 2009-11-11 |
| GB2459883B GB2459883B (en) | 2012-11-14 |
Family
ID=39571019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0808390.9A Expired - Fee Related GB2459883B (en) | 2008-05-09 | 2008-05-09 | An over-temperature protection system for a braking resistor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2459883B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010031583A1 (en) * | 2010-07-20 | 2012-01-26 | Bayerische Motoren Werke Aktiengesellschaft | Method for operating electrical drive device for motor car during towing, involves constantly checking temperature sensor, and deactivating short circuit device if temperature sensor detects incorrect high temperature |
| CN104980087A (en) * | 2014-04-07 | 2015-10-14 | 控制技术有限公司 | Motor drive and method of controlling temperature of motor drive |
| CN105470918A (en) * | 2015-12-30 | 2016-04-06 | 深圳市合信自动化技术有限公司 | Device for protecting internal brake resistor and servo driver |
| US20190315231A1 (en) * | 2018-04-17 | 2019-10-17 | Dayton-Phoenix Group, Inc. | System and Method for Monitoring Resistor Life |
| EP3789231A1 (en) * | 2019-08-08 | 2021-03-10 | Hamilton Sundstrand Corporation | Efficient regenerative electrical braking |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107887885B (en) * | 2017-11-09 | 2019-08-20 | 中车株洲电力机车有限公司 | A kind of guard method of braking resistor, system, device and readable storage medium storing program for executing |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4035692A (en) * | 1975-11-20 | 1977-07-12 | Cutler-Hammer, Inc. | Resistor protection systems |
| JPS62277081A (en) * | 1986-05-21 | 1987-12-01 | Mitsubishi Electric Corp | Inverter system |
| JPS63161886A (en) * | 1986-12-23 | 1988-07-05 | Mitsubishi Electric Corp | Consumption circuit for regenerative energy of inverter device |
| EP0393814A1 (en) * | 1989-02-18 | 1990-10-24 | Eaton Limited | Temperature sensor for an electrical load resistor |
| EP0773623A1 (en) * | 1995-04-28 | 1997-05-14 | Fanuc Ltd | Method and device for protecting regenerative resistor of servo motor for driving inverter |
| US20050174081A1 (en) * | 2004-02-06 | 2005-08-11 | That Nguyen | Multi-stage dynamic braking resistor network |
-
2008
- 2008-05-09 GB GB0808390.9A patent/GB2459883B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4035692A (en) * | 1975-11-20 | 1977-07-12 | Cutler-Hammer, Inc. | Resistor protection systems |
| JPS62277081A (en) * | 1986-05-21 | 1987-12-01 | Mitsubishi Electric Corp | Inverter system |
| JPS63161886A (en) * | 1986-12-23 | 1988-07-05 | Mitsubishi Electric Corp | Consumption circuit for regenerative energy of inverter device |
| EP0393814A1 (en) * | 1989-02-18 | 1990-10-24 | Eaton Limited | Temperature sensor for an electrical load resistor |
| EP0773623A1 (en) * | 1995-04-28 | 1997-05-14 | Fanuc Ltd | Method and device for protecting regenerative resistor of servo motor for driving inverter |
| US20050174081A1 (en) * | 2004-02-06 | 2005-08-11 | That Nguyen | Multi-stage dynamic braking resistor network |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010031583A1 (en) * | 2010-07-20 | 2012-01-26 | Bayerische Motoren Werke Aktiengesellschaft | Method for operating electrical drive device for motor car during towing, involves constantly checking temperature sensor, and deactivating short circuit device if temperature sensor detects incorrect high temperature |
| CN104980087A (en) * | 2014-04-07 | 2015-10-14 | 控制技术有限公司 | Motor drive and method of controlling temperature of motor drive |
| EP2933916A3 (en) * | 2014-04-07 | 2016-02-17 | Control Techniques Ltd | Motor drive and method of controlling a temperature of a motor drive |
| US9722514B2 (en) | 2014-04-07 | 2017-08-01 | Nidec Control Techniques Limited | Motor drive and method of controlling a temperature of a motor drive |
| CN105470918A (en) * | 2015-12-30 | 2016-04-06 | 深圳市合信自动化技术有限公司 | Device for protecting internal brake resistor and servo driver |
| CN105470918B (en) * | 2015-12-30 | 2018-11-06 | 深圳市合信自动化技术有限公司 | A kind of device and servo-driver that internal braking resistor is protected |
| US20190315231A1 (en) * | 2018-04-17 | 2019-10-17 | Dayton-Phoenix Group, Inc. | System and Method for Monitoring Resistor Life |
| EP3789231A1 (en) * | 2019-08-08 | 2021-03-10 | Hamilton Sundstrand Corporation | Efficient regenerative electrical braking |
| US11142075B2 (en) | 2019-08-08 | 2021-10-12 | Hamilton Sundstrand Corporation | Efficient regenerative electrical braking |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0808390D0 (en) | 2008-06-18 |
| GB2459883B (en) | 2012-11-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20220509 |