CN203479879U - Voltage detection circuit for motor protector - Google Patents
Voltage detection circuit for motor protector Download PDFInfo
- Publication number
- CN203479879U CN203479879U CN201320597835.0U CN201320597835U CN203479879U CN 203479879 U CN203479879 U CN 203479879U CN 201320597835 U CN201320597835 U CN 201320597835U CN 203479879 U CN203479879 U CN 203479879U
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- Prior art keywords
- circuit
- detection circuit
- motor protector
- voltage
- diode
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- Control Of Electric Motors In General (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to a voltage detection circuit for a motor protector. The voltage detection circuit includes a rectification circuit, a voltage stabilizing circuit, and a signal detection circuit, the signal detection circuit takes power from the output end of the rectification circuit, and the output end of the rectification circuit is connected to the input end of the voltage stabilizing circuit via a diode D1. Through the adoption of the unidirectional conductivity of the diode, the unidirectional electrical isolation of the rectification circuit and the voltage stabilizing circuit can be carried out. After the power of a system is lost, the voltage detection circuit for the motor protector can timely cut off the output result even though charge is still stored in filtering capacitance, so that the system detection result can actually reflect the voltage condition of the circuits to be detected, thereby improving the accuracy of system actions.
Description
Technical field
The utility model relates to a kind of voltage detecting circuit for motor protector.
Background technology
After voltage detecting circuit generally adopts the voltage of test line is converted; compare with the reference value designing; when it exceeds or during lower than the characterization value of normal voltage, for the voltage detecting circuit of motor protector, output signal to rear class unit, by rear class unit output result.The power supply Integrated design of the general and system of voltage conversion circuit of the prior art, the output terminal that is rectification circuit is connected to relatively end on one side, another side also passes through mu balanced circuit stable output voltage, for system provides power supply, and mu balanced circuit comprises the filter capacitor of certain capacity, after system cut-off, due to " energy storage " effect of filter capacitor, within the scope of certain hour, comparator circuit still has signal output; If during this period, while again putting into operation for the voltage detecting circuit of motor protector, comparer cannot provide correct judged result, affect whole system accuracy of action.
Summary of the invention
The purpose of this utility model is to overcome the defect of prior art, provides that a kind of circuit structure is simple, cost of products is relatively low and can greatly improve the voltage detecting circuit that can be used for motor protector of system acting accuracy.
For achieving the above object; the utility model adopts a kind of like this voltage detecting circuit for motor protector; comprise rectification circuit, mu balanced circuit and signal detection circuit; described signal detection circuit is from the output terminal power taking of described rectification circuit, and the output terminal of described rectification circuit is connected to the input end of described mu balanced circuit through diode D1.
Especially, described signal detection circuit comprises comparer U4A, and the positive terminal of described diode D1 is connected to the relatively end of comparer U4A through resistance R 44.
Compared with the prior art, the beneficial effects of the utility model are embodied in: adopt the unilateral conduction of diode, rectification circuit and mu balanced circuit are carried out to unidirectional electrical isolation.After system dead electricity, even if still have charge storage in filter capacitor, for the voltage detecting circuit of motor protector, also can turn-off in time Output rusults, the system testing result of making truly reflects the voltage condition of test line, has improved the accuracy of system acting.
Accompanying drawing explanation
Fig. 1 is that the utility model embodiment is for the schematic diagram of the voltage detecting circuit of motor protector.
Embodiment
As shown in Figure 1; a kind of voltage detecting circuit for motor protector; comprise rectification circuit, mu balanced circuit and signal detection circuit, the output terminal power taking of signal detection circuit self-rectifying circuit, the output terminal of rectification circuit is connected to the input end of mu balanced circuit through diode D1.
Signal detection circuit comprises comparer U4A, and the positive terminal of diode D1 is connected to the relatively end of comparer U4A through resistance R 44.
Claims (2)
1. the voltage detecting circuit for motor protector; comprise rectification circuit, mu balanced circuit and signal detection circuit; described signal detection circuit, from the output terminal power taking of described rectification circuit, is characterized in that: the output terminal of described rectification circuit is connected to the input end of described mu balanced circuit through diode (D1).
2. the voltage detecting circuit for motor protector according to claim 1; it is characterized in that: described signal detection circuit comprises comparer (U4A), the positive terminal of described diode (D1) is connected to the relatively end of comparer (U4A) through resistance (R44).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597835.0U CN203479879U (en) | 2013-09-24 | 2013-09-24 | Voltage detection circuit for motor protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597835.0U CN203479879U (en) | 2013-09-24 | 2013-09-24 | Voltage detection circuit for motor protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203479879U true CN203479879U (en) | 2014-03-12 |
Family
ID=50228187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320597835.0U Expired - Lifetime CN203479879U (en) | 2013-09-24 | 2013-09-24 | Voltage detection circuit for motor protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203479879U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502757A (en) * | 2014-12-16 | 2015-04-08 | 河北工业大学 | Monitoring device for performance state of intelligent motor protector |
-
2013
- 2013-09-24 CN CN201320597835.0U patent/CN203479879U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502757A (en) * | 2014-12-16 | 2015-04-08 | 河北工业大学 | Monitoring device for performance state of intelligent motor protector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 325600 no.328, wei19 Road, Yueqing Economic Development Zone, Zhejiang Province Patentee after: XINLING ELECTRICAL Co.,Ltd. Address before: 325604, Yueqing, Zhejiang province Liushi town wide industrial zone Patentee before: XINLING ELECTRICAL Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140312 |