CN108631689B - Driving device and power supply reverse connection protection circuit thereof - Google Patents
Driving device and power supply reverse connection protection circuit thereof Download PDFInfo
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- CN108631689B CN108631689B CN201710153766.7A CN201710153766A CN108631689B CN 108631689 B CN108631689 B CN 108631689B CN 201710153766 A CN201710153766 A CN 201710153766A CN 108631689 B CN108631689 B CN 108631689B
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- voltage
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- power supply
- relay
- conducting
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Classifications
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- 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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. DC/AC converters
- H02H7/1225—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. DC/AC converters responsive to internal faults, e.g. shoot-through
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
A driving device and a power supply reverse connection protection circuit thereof are suitable for being electrically connected between a high-voltage power supply and an inverter, and the high-voltage power supply provides a direct-current voltage. The polarity detection unit is electrically connected with the high-voltage power supply to detect the direct-current voltage, and generates a detection voltage signal with a magnitude related to the polarity of the direct-current voltage according to the polarity of the direct-current voltage and the test voltage. The judging unit is electrically connected with the polarity detecting unit to receive the detecting voltage signal, obtains a judging result according to the comparison of a preset value and the detecting voltage signal, and generates a control signal switched between a conducting level and a non-conducting level according to the judging result. And the relay unit is electrically connected with the high-voltage power supply to receive the direct-current voltage, is electrically connected with the judging unit to receive the control signal and is controlled by the control signal to determine whether to output the direct-current voltage to the inverter. Therefore, the power supply reverse connection protection function can be provided to avoid the burning of the inverter.
Description
Technical Field
The present invention relates to a driving device, and more particularly to a driving device with power supply reverse connection protection function and a power supply reverse connection protection circuit thereof.
Background
In the prior art, an input power supply of an inverter applied to a driving motor is a high-voltage direct current power supply, if connectors are reversely connected due to human or other factors, the inverter may be damaged, so how to judge whether the power supply is reversely connected is a future research direction.
Disclosure of Invention
The invention aims to provide a driving device for judging whether the polarity of a power supply is correct.
The driving device is suitable for being electrically connected with a high-voltage power supply for providing a direct-current voltage and driving a motor, and comprises a power supply reverse connection protection circuit and an inverter.
The power supply reverse connection protection circuit comprises a polarity detection unit, a judging unit and a relay unit.
The polarity detection unit is electrically connected with the high-voltage power supply to detect the direct-current voltage, and generates a detection voltage signal with a magnitude related to the polarity of the direct-current voltage according to the polarity of the direct-current voltage and the test voltage.
The judging unit is electrically connected with the polarity detecting unit to receive the detecting voltage signal, obtains a judging result according to the comparison of a preset value and the detecting voltage signal, and generates a control signal switched between a conducting level and a non-conducting level according to the judging result.
The relay unit is electrically connected with the high-voltage power supply to receive the direct-current voltage, and is electrically connected with the judging unit to receive the control signal and is controlled by the control signal to determine whether to output the direct-current voltage.
The inverter is electrically connected between the relay unit and the motor, and is used for driving the motor when receiving the direct-current voltage from the relay unit.
The invention relates to a power supply reverse connection protection circuit, which is suitable for being electrically connected between a high-voltage power supply and an inverter, wherein the high-voltage power supply is used for providing a direct-current voltage, and the power supply reverse connection protection circuit comprises:
A polarity detecting unit electrically connected to the high voltage power supply for detecting the DC voltage and generating a detection voltage signal with a magnitude related to the polarity of the DC voltage according to the polarity of the DC voltage and the test voltage;
the judging unit is electrically connected with the polarity detecting unit to receive the detection voltage signal, a judging result is obtained according to comparison of a preset value and the magnitude of the detection voltage signal, and a control signal switched between a conducting level and a non-conducting level is generated according to the judging result; and
And the relay unit is electrically connected with the high-voltage power supply to receive the direct-current voltage, is electrically connected with the judging unit to receive the control signal and is controlled by the control signal to determine whether to output the direct-current voltage to the inverter.
The driving device of the present invention includes two input terminals, a second resistor, a switch, a first capacitor, a second capacitor, a third capacitor, a diode, a third resistor and a differential amplifier.
The two input ends are respectively and electrically connected with the two ends of the high-voltage power supply.
The second resistor has a first end and a second end electrically connected to a corresponding one of the two input ends.
The switch has a first end electrically connected to the second end of the second resistor and a second end, and is controlled to be switched between conducting and non-conducting.
The first capacitor has a first end electrically connected to the second end of the switch and a second end.
The second capacitor has a first end electrically connected to the second end of the switch and a second end receiving a first voltage.
The third capacitor has a first end for receiving the first voltage and a second end electrically connected to a corresponding one of the two input ends.
The diode has an anode and a cathode electrically connected to the second end of the first capacitor.
A third resistor having a first end electrically connected to the cathode of the diode and a second end receiving the first voltage.
The driving device of the present invention, the polarity detecting unit further comprises a differential amplifier, the differential amplifier having a non-inverting input terminal electrically connected to the first terminal of the third resistor, an inverting input terminal receiving the first voltage, and an output terminal providing the detection voltage signal.
The driving device provided by the invention comprises a relay and a relay driver.
The relay is electrically connected between the high-voltage power supply and the inverter and is controlled to be switched between conduction and non-conduction, and when the relay is conducted, the relay transmits the direct-current voltage from the high-voltage power supply to the inverter, and when the relay is non-conducted, the relay does not transmit the direct-current voltage from the high-voltage power supply to the inverter.
The relay driver is electrically connected with the relay, receives the control signal and controls the relay according to the control signal.
The invention has the beneficial effects that: the invention can provide a power supply reverse connection protection function between the high-voltage power supply and the inverter in a driving device such as a driving motor so as to avoid the burnout of the inverter.
Drawings
Other features and advantages of the present invention will become apparent from the following description of the embodiments with reference to the drawings, in which:
FIG. 1 is a circuit diagram of an embodiment of a driving device with power supply reverse connection protection according to the present invention;
FIG. 2 is a signal measurement diagram of the embodiment; and
Fig. 3 is another signal measurement diagram of this embodiment.
Detailed Description
Before the present invention is described in detail, it should be noted that in the following description, like elements are denoted by the same reference numerals.
Referring to fig. 1, an embodiment of a driving device with power supply reverse connection protection function of the present invention is suitable for electrically connecting a high voltage power supply 1, the high voltage power supply 1 has two connectors for providing a dc voltage and drives a motor 4, and the driving device comprises a power supply reverse connection protection circuit 2, an inverter 3 and a dc capacitor Cdc.
The power supply reverse connection protection circuit 2 includes a polarity detection unit 21, a relay unit 23 and a determination unit 22.
The polarity detecting unit 21 is electrically connected to the high voltage power source 1 to detect the dc voltage, and generates a detection voltage signal with a magnitude related to the polarity of the dc voltage according to the polarity of the dc voltage and the test voltage. The polarity detecting unit 21 includes two input terminals i, a diode D, a switch S, a second resistor R2, a first capacitor C1, a third resistor R3, a second capacitor C2, a third capacitor C3 and a differential amplifier 5.
The two input terminals i are electrically connected to the two ends of the high voltage power supply 1, respectively. The second resistor has a first end and a second end electrically connected to a corresponding one of the two input ends. The switch has a first end electrically connected to the second end of the second resistor and a second end, and is controlled to be switched between conducting and non-conducting. The first capacitor has a first end electrically connected to the second end of the switch and a second end. The second capacitor has a first terminal electrically connected to the second terminal of the switch and a second terminal receiving a first voltage (ground GND in this embodiment, the voltage level is 0). The third capacitor has a first end for receiving the first voltage and a second end electrically connected to a corresponding one of the two input ends. The diode has an anode and a cathode electrically connected to the second end of the first capacitor. The third resistor has a first end electrically connected to the cathode of the diode and a second end receiving the first voltage. The differential amplifier 5 has a non-inverting input terminal (+) electrically connected to the first terminal of the third resistor R3, an inverting input terminal (-) receiving the first voltage, and an output terminal providing the detection voltage signal.
The judging unit 22 is electrically connected to the polarity detecting unit 21 to receive the detecting voltage signal, and obtains a judging result according to a comparison between a preset value and the magnitude of the detecting voltage signal, and generates a control signal switching between a conducting level and a non-conducting level according to the judging result. The judging unit 22 includes a comparator 6 and a microprocessor MCU, the comparator 6 has a non-inverting input terminal (+) receiving the detection voltage signal, an inverting input terminal (-) receiving a threshold voltage proportional to the preset value, and an output terminal providing an output. The microprocessor MCU is electrically connected with the output end of the comparator 6 to receive the output of the comparator 6 and generate a control signal according to the output of the comparator 6, when the magnitude of the detection voltage signal is smaller than a preset time interval and larger than the critical voltage, the control signal is at the conducting level, and conversely, the control signal is at the non-conducting level.
The relay unit 23 is electrically connected to the high voltage power supply 1 to receive the dc voltage, and is electrically connected to the judging unit 22 to receive the control signal CTL, and is controlled by the control signal CTL to determine whether to output the dc voltage, and the relay unit 23 includes a relay 25 and a relay driver 24.
A relay 25 is electrically connected between the high voltage power supply 1 and the inverter 3 and is controlled to switch between conducting and non-conducting, when conducting, the relay 25 delivers the dc voltage from the high voltage power supply to the inverter, and when non-conducting, the relay does not deliver the dc voltage from the high voltage power supply to the inverter. The relay driver is electrically connected with the relay, receives the control signal and controls the relay according to the control signal.
The inverter is electrically connected between the relay unit and the motor, and is used for driving the motor when receiving the direct-current voltage from the relay unit.
The dc capacitor Cdc has a first end electrically connected to the inverter and a second end grounded.
As shown in fig. 2, in the signal measurement chart of the above embodiment, when the time=10ms, and the dc voltage of the high voltage source is preset to +50v, the diode is turned on, the voltage across the third resistor R3 is gradually increased, so that the detected voltage signal exceeds the threshold voltage (the preset threshold voltage=2v in this case, but not limited thereto) within a predetermined time (18 ms-90 ms), the output of the comparator 6 is turned to a high voltage, a rising edge of the output of the comparator 6 further makes the output control signal CTL of the microprocessor MCU to a high level (i.e. the conduction level defined in this case), so that the relay driver 24 controls the relay 25 to switch on, and the dc voltage is transferred to the inverter 3 via the relay 25. As shown in fig. 3, when the time=10ms, and the dc voltage of the high voltage power supply is preset to-50V, the diode D is not turned on, the voltage across the third resistor R3 is maintained at 0V, so that the detected voltage signal does not exceed the threshold voltage, and the output of the comparator 6 and the control signal CTL are both at low level (i.e. the non-conductive level defined in the present case, 0V), so that the relay driver 24 controls the relay 25 to be turned off, and the dc voltage cannot be transmitted to the inverter 3.
In summary, the above embodiment has the following advantages:
1. By using the polarity detecting unit 21 and the judging unit 22, it can be judged whether the power polarity is correct, and if the power polarity is incorrect, the high-voltage power supply is forbidden to supply power to the inverter 3 so as to avoid burning the inverter 3.
2. The detection effect of the differential amplifier 5 and the judging unit 22 isolated from the high-voltage power supply can be achieved by using the first capacitor C1, the second capacitor C2 and the third capacitor C3, and the insulation requirement of the two ends of the high-voltage direct-current power supply can be met.
3. The polarity detecting unit 21 and the judging unit 22 can be independent of the relay unit 23 and the dc capacitor Cdc, and the relay unit 23 is provided in a general system, so that no additional loss element is required, and the purpose of the present invention can be achieved.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, which is defined by the appended claims and their equivalents.
Claims (2)
1. A driving device with power supply reverse connection protection function, which is suitable for being electrically connected with a high-voltage power supply for providing a direct-current voltage and driving a motor, and is characterized in that the driving device comprises: the power supply reverse connection protection circuit comprises a polarity detection unit, a judgment unit and a relay unit, wherein the polarity detection unit is electrically connected with the high-voltage power supply to detect the direct-current voltage, generates a detection voltage signal with the magnitude related to the polarity of the direct-current voltage according to the polarity and the voltage of the direct-current voltage, the judgment unit is electrically connected with the polarity detection unit to receive the detection voltage signal, obtains a judgment result according to the comparison of a preset value and the magnitude of the detection voltage signal, generates a control signal switched between a conducting level and a non-conducting level according to the judgment result, and is electrically connected with the high-voltage power supply to receive the direct-current voltage, and is electrically connected with the judgment unit to receive the control signal and controlled by the control signal to determine whether to output the direct-current voltage;
And
An inverter electrically connected between the relay unit and the motor and for driving the motor when receiving the DC voltage from the relay unit,
The polarity detection unit includes: the two input ends are respectively and electrically connected with the two ends of the high-voltage power supply;
a second resistor having a first end and a second end electrically connected to a corresponding one of the two input ends;
a switch having a first end electrically connected to the second end of the second resistor and a second end, and being controlled to switch between conducting and non-conducting;
a first capacitor having a first end electrically connected to the second end of the switch and a second end;
A second capacitor having a first end electrically connected to the second end of the switch and a second end receiving a first voltage;
A third capacitor having a first end for receiving the first voltage and a second end electrically connected to a corresponding one of the two input ends;
A diode having an anode electrically connected to the second end of the first capacitor and a cathode; and a third resistor having a first end electrically connected to the cathode of the diode and a second end receiving the first voltage,
The polarity detection unit further includes: a differential amplifier having a non-inverting input terminal electrically connected to the first terminal of the third resistor, an inverting input terminal receiving the first voltage, and an output terminal providing the detection voltage signal,
The relay unit includes: a relay electrically connected between the high voltage power supply and the inverter and controlled to be switched between conducting and non-conducting, when conducting, the relay transmits the direct voltage from the high voltage power supply to the inverter, and when non-conducting, the relay does not transmit the direct voltage from the high voltage power supply to the inverter; and a relay driver electrically connected with the relay, receiving the control signal and controlling the relay according to the control signal.
2. The utility model provides a power reverse connection protection circuit, is applicable to electrically connected between a high voltage power supply and an dc-to-ac converter, and this high voltage power supply is used for providing a direct voltage, and its characterized in that, this power reverse connection protection circuit includes: a polarity detecting unit electrically connected to the high voltage power supply for detecting the DC voltage and generating a detection voltage signal with a magnitude related to the polarity of the DC voltage according to the polarity and voltage of the DC voltage;
The judging unit is electrically connected with the polarity detecting unit to receive the detection voltage signal, a judging result is obtained according to comparison of a preset value and the magnitude of the detection voltage signal, and a control signal switched between a conducting level and a non-conducting level is generated according to the judging result; and a relay unit electrically connected to the high voltage power supply for receiving the DC voltage, and electrically connected to the judging unit for receiving the control signal and being controlled by the control signal to determine whether to output the DC voltage to the inverter,
The polarity detection unit includes: the two input ends are respectively and electrically connected with the two ends of the high-voltage power supply;
a second resistor having a first end and a second end electrically connected to a corresponding one of the two input ends;
a switch having a first end electrically connected to the second end of the second resistor and a second end, and being controlled to switch between conducting and non-conducting;
a first capacitor having a first end electrically connected to the second end of the switch and a second end;
A second capacitor having a first end electrically connected to the second end of the switch and a second end receiving a first voltage;
A third capacitor having a first end for receiving the first voltage and a second end electrically connected to a corresponding one of the two input ends;
A diode having an anode electrically connected to the second end of the first capacitor and a cathode; and a third resistor having a first end electrically connected to the cathode of the diode and a second end receiving the first voltage,
The polarity detection unit further includes: a differential amplifier having a non-inverting input electrically connected to the second end of the third resistor, an inverting input receiving the first voltage, and an output providing the detection voltage signal,
The relay unit includes: a relay electrically connected between the high voltage power supply and the inverter and controlled to be switched between conducting and non-conducting, when conducting, the relay transmits the direct voltage from the high voltage power supply to the inverter, and when non-conducting, the relay does not transmit the direct voltage from the high voltage power supply to the inverter; and a relay driver electrically connected with the relay, receiving the control signal and controlling the relay according to the control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710153766.7A CN108631689B (en) | 2017-03-15 | 2017-03-15 | Driving device and power supply reverse connection protection circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710153766.7A CN108631689B (en) | 2017-03-15 | 2017-03-15 | Driving device and power supply reverse connection protection circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108631689A CN108631689A (en) | 2018-10-09 |
| CN108631689B true CN108631689B (en) | 2024-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710153766.7A Active CN108631689B (en) | 2017-03-15 | 2017-03-15 | Driving device and power supply reverse connection protection circuit thereof |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109546642B (en) * | 2019-01-02 | 2021-04-13 | 阳光电源股份有限公司 | Inverter direct-current input reverse connection protection module and device |
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| JP2004328892A (en) * | 2003-04-24 | 2004-11-18 | Matsushita Electric Ind Co Ltd | Motor driving device |
| CN101060304A (en) * | 2007-06-11 | 2007-10-24 | 湖南巨汇科技发展有限公司 | Motor intelligent power-saving protector |
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| JP5743934B2 (en) * | 2012-03-16 | 2015-07-01 | 株式会社東芝 | Inverter device and power steering device |
| TWI558047B (en) * | 2015-07-01 | 2016-11-11 | 茂達電子股份有限公司 | Motor driving circuit with power reversal protection and fan device |
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| JP2004328892A (en) * | 2003-04-24 | 2004-11-18 | Matsushita Electric Ind Co Ltd | Motor driving device |
| CN101060304A (en) * | 2007-06-11 | 2007-10-24 | 湖南巨汇科技发展有限公司 | Motor intelligent power-saving protector |
| CN104466918A (en) * | 2014-11-21 | 2015-03-25 | 新疆希望电子有限公司 | Energy storage battery polarity reverse connection protective circuit and recognition method thereof |
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