CN209217689U - The auxiliary power supply of DC bus detection and protection circuit - Google Patents
The auxiliary power supply of DC bus detection and protection circuit Download PDFInfo
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- CN209217689U CN209217689U CN201920100522.7U CN201920100522U CN209217689U CN 209217689 U CN209217689 U CN 209217689U CN 201920100522 U CN201920100522 U CN 201920100522U CN 209217689 U CN209217689 U CN 209217689U
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- bus
- voltage
- power supply
- circuit
- auxiliary power
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Abstract
The utility model discloses the auxiliary power supply of a kind of detection of DC bus and protection circuit; zener diode is connected in certain resistance branch of DC bus equalizer circuit by the device; or with certain resistor coupled in parallel in voltage sample circuit, the stabilizing voltage characteristic using zener diode is that DC bus detects and circuit is protected to power.Compare traditional DC/DC accessory power supply power supply unit, its main feature is that saving cost and volume, reduce because power device opens electromagnetic compatibility problem brought by shutdown, magnetic element work, reference can be provided for more engineer applications, promote the reliability and security of product.
Description
Technical field
The utility model relates to a kind of frequency conversion system equipment more particularly to a kind of detection of DC bus and protect the auxiliary of circuit
Help power supply unit.
Background technique
In Application of frequency conversion technique, inversion exchange output be by DC bus detect on the basis of one of, in addition, being arranged
Under-voltage protection and current foldback circuit are also required to voltage, the electric current of detection DC bus.If detection is inaccurate, it may appear that frequency converter
Output abnormality even burns plate aircraft bombing.It is dynamic to need to make frequency conversion system corresponding protection when overvoltage/undervoltage, overcurrent occurs in DC bus
Make, corresponding protection circuit need to be designed.
The components such as the amplifier in need for being additionally provided accessory power supply, triode in DC bus detection and protection circuit,
The prior art uses DC/DC accessory power supply scheme, and volume is big, at high cost, and design is complicated and can introduce electromagnetic interference problem.Separately
Outside, since the input voltage lower limit design of DC/DC accessory power supply is higher, the DC bus-bar voltage that can detecte, current range compared with
It is narrow, reference can not be provided for more engineer applications.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of based on pressure stabilizing two
The DC bus of pole pipe characteristic detects and the auxiliary power supply scheme of protection circuit.
To solve the above problems, the auxiliary power supply of a kind of DC bus detection of the utility model and protection circuit, packet
It includes: the direct current for being the rectifier of DC voltage by ac voltage rectifier, for being pressed between each Support Capacitor of DC bus
Bus uniform voltage circuit, or the voltage sample circuit for dividing and sampling for DC bus-bar voltage, are used for DC bus-bar voltage, electricity
Stream detection and when DC bus-bar voltage is under-voltage, over-voltage, when overcurrent, make DC bus detection mutually to be protected and protect
Circuit, for being the inverter of ac pulse voltage by DC bus DC voltage inversion；It is characterized by: the device is will be steady
Press diodeD z Be connected in certain resistance branch of the DC bus equalizer circuit, or with certain resistance in voltage sample circuit
Parallel connection utilizes zener diodeD z Stabilizing voltage characteristic be DC bus detect and protect circuit power supply.
Auxiliary power supply by adopting the above technical scheme, DC bus equalizer circuit is by bus Support CapacitorC k (k=1, 2 ... ..., n), equalizing resistanceR k (K=1,2 ... ..., n) composition；It is describedC 1 ~C n It is connected on DC busP、NBoth ends,R 1 ~R n String
It is associated in DC busP、NBoth ends form equalizing resistance branch, R k WithC k It is in parallel；The bus Support CapacitorC k It both ends can be with one
A equalizing resistance is in parallel, in parallel after can also connecting with multiple equalizing resistances, i.e.,R k It can be composed in series by multiple resistance.
Using this auxiliary power supply by zener diodeD z With electric capacity of voltage regulationC z Equalizing resistance branch is series at after parallel connection again
Lu Zhong,V CC+ 、V CC- Respectively fromD z OrC z Both ends take electricity.
As a kind of improvement of scheme in view of the above technology, voltage sample circuit is by divider resistanceR zk (K=1,2 ... ..., n)
Composition；It is describedR z1 ~R zn It is connected on DC busP、NBoth ends, if by zener diodeD z And electric capacity of voltage regulationC z After parallel connection again with appoint
One divider resistanceR zk Parallel connection,V CC+ 、V CC- Respectively fromD z OrC z Both ends take electricity.
Another kind as scheme in view of the above technology improves, and DC bus detection and protection circuit further include current sample
ResistanceR i1 、R i2 , voltage sample resistanceR v1 、R v2 , itself need to be provided accessory power supply to maintain to work normally.
It further includes current sampling resistor that circuit is detected and protected for DC busR i1 、R i2 , voltage sample resistanceR v1 、R v2 ,
Itself need to be provided accessory power supply to maintain to work normally.
One of power unit module in frequency conversion system is belonged to itself for rectifier and inverter.
The auxiliary power supply for implementing a kind of DC bus detection described in the utility model and protection circuit, with existing skill
Art DC/DC auxiliary power unit is compared to having the following advantages: save cost and volume, reduce because power device open shutdown,
Electromagnetic compatibility problem brought by magnetic element work；In addition, since zener diode pressure stabilizing grade is compared to DC/DC auxiliary electricity
The input voltage lower limit in source is lower, therefore the DC bus-bar voltage and current range that can monitor are wider, can be more engineerings
Using reference is provided, the reliability and security of product is promoted.
Detailed description of the invention
The utility model is described in further detail with reference to the accompanying drawing.
Fig. 1 is the electricity of the auxiliary power supply first embodiment of a kind of DC bus detection of the utility model and protection circuit
Road block diagram.
Fig. 2 is the circuit block diagram of auxiliary power supply second embodiment shown in Fig. 1.
Specific embodiment
It includes rectifier, DC bus equalizer circuit, DC bus detection and protection electricity that Fig. 1, which shows the utility model,
Road, inverter.R 1 ~R n It is connected on DC busP、NBoth ends form equalizing resistance branch, zener diode Dz and electric capacity of voltage regulation Cz
It is series in equalizing resistance branch again after parallel connection.After system electrification, rectifier exports DC voltage, bus Support CapacitorC 1 ~ C n It stores and releases energy, in DC bus equalizing resistance branchR 1 ~R n In, withR k Concatenated zener diodeD z It is reversed and hits
It wears, both end voltage remains unchanged, electric capacity of voltage regulationC z It provides needed for DC bus detection and protection circuit workV CC+ WithV CC- 。
When electricity under system, until when DC bus-bar voltage is lower than zener diode pressure stabilizing grade, zener diode cut-off, electric capacity of voltage regulationC z
Voltage be gradually decrease to (V CC+ -V CC- ) below when, DC bus detection and protection circuit stop working.
It is shown in Fig. 2 be include rectifier, DC bus equalizer circuit, voltage sample circuit, DC bus detection and protect
Protection circuit, inverter.R z1 ~R zn It is connected on DC busP、NBoth ends form voltage sample circuit, zener diode Dz and pressure stabilizing
After capacitor Cz is in parallel again with any divider resistance in voltage sample circuitR zk It is in parallel.After system electrification, rectifier output is straight
Galvanic electricity pressure, bus Support CapacitorC 1 ~C n It stores and releases energy, in voltage sample circuitR z1 ~R zn In, withR zk Pressure stabilizing in parallel
DiodeD z It is reversed breakdown, both end voltage remains unchanged, electric capacity of voltage regulationC z DC bus detection and protection circuit work are provided
RequiredV CC+ WithV CC- .When electricity under system, until when DC bus-bar voltage is lower than zener diode pressure stabilizing grade, zener diode
Cut-off, electric capacity of voltage regulationC z Voltage be gradually decrease to (V CC+ -V CC- ) below when, DC bus detection and protection circuit stop working.
The above is only the preferred embodiment of the utility model.It should be pointed out that above-mentioned specific embodiment is only
It is that schematically and not restrictive, therefore, the utility model is not limited to disclosed specific embodiment, and should fall into this reality
With whole embodiments in novel scope of the claims.
Claims (6)
1. the auxiliary power supply of a kind of DC bus detection and protection circuit, successively includes for being straight by ac voltage rectifier
The rectifier of galvanic electricity pressure, the DC bus equalizer circuit for being pressed between each Support Capacitor of DC bus, or it is used for direct current
The voltage sample circuit of busbar voltage partial pressure and sampling for DC bus-bar voltage, current detecting and works as DC bus-bar voltage
Under-voltage, over-voltage, when overcurrent, make DC bus detection mutually to be protected and protection circuit, for by DC bus direct current
Pressing inversion is the inverter of ac pulse voltage；It is characterized by: the device is by zener diodeD z It is connected on the direct current
In certain resistance branch of bus uniform voltage circuit, or with certain resistor coupled in parallel in voltage sample circuit, utilize zener diodeD z 's
Stabilizing voltage characteristic is that DC bus detects and protect circuit power supply.
2. auxiliary power supply according to claim 1, it is characterised in that: the DC bus equalizer circuit is by bus branch
Support capacitorC k (K=1,2 ... ..., n), equalizing resistanceR k (K=1,2 ... ..., n) composition；It is describedC 1 ~C n It is connected on DC busP、 NBoth ends,R 1 ~R n It is connected on DC busP、NBoth ends form equalizing resistance branch, R k WithC k It is in parallel；The bus Support CapacitorC k Both ends can be in parallel with an equalizing resistance, in parallel after can also connecting with multiple equalizing resistances, i.e.,R k It can be by multiple resistance
It is composed in series.
3. auxiliary power supply according to claim 1, it is characterised in that: the zener diodeD z With electric capacity of voltage regulationC z
It is series in equalizing resistance branch again after parallel connection,V CC+ 、V CC- Respectively fromD z OrC z Both ends take electricity.
4. auxiliary power supply according to claim 1, it is characterised in that: the voltage sample circuit is by divider resistanceR zk
(K=1,2 ... ..., n) composition；It is describedR z1 ~R zn It is connected on DC busP、NBoth ends, if by zener diodeD z And electric capacity of voltage regulationC z After parallel connection again with any divider resistanceR zk Parallel connection,V CC+ 、V CC- Respectively fromD z OrC z Both ends take electricity.
5. auxiliary power supply according to claim 1, it is characterised in that: the DC bus detection and protection circuit are also
Including current sampling resistorR i1 、R i2 , voltage sample resistanceR v1 、R v2 , itself need to be provided accessory power supply to maintain normal work
Make.
6. auxiliary power supply according to claim 1, it is characterised in that: the rectifier and inverter belong to itself
One of power unit module in frequency conversion system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920100522.7U CN209217689U (en) | 2019-01-22 | 2019-01-22 | The auxiliary power supply of DC bus detection and protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920100522.7U CN209217689U (en) | 2019-01-22 | 2019-01-22 | The auxiliary power supply of DC bus detection and protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209217689U true CN209217689U (en) | 2019-08-06 |
Family
ID=67467420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920100522.7U Active CN209217689U (en) | 2019-01-22 | 2019-01-22 | The auxiliary power supply of DC bus detection and protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209217689U (en) |
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2019
- 2019-01-22 CN CN201920100522.7U patent/CN209217689U/en active Active
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