CN203813461U - UPS cold start circuit - Google Patents
UPS cold start circuit Download PDFInfo
- Publication number
- CN203813461U CN203813461U CN201420023149.7U CN201420023149U CN203813461U CN 203813461 U CN203813461 U CN 203813461U CN 201420023149 U CN201420023149 U CN 201420023149U CN 203813461 U CN203813461 U CN 203813461U
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- Prior art keywords
- ups
- current
- storage battery
- voltage
- cold start
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- Expired - Lifetime
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- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 description 9
- 230000002045 lasting effect Effects 0.000 description 5
- 238000007599 discharging Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Disclosed is a UPS cold start-up circuit which relates to the technical field of UPS cold start. The UPS cold start circuit includes: a current-limiting resistor which is connected to a storage battery of a UPS in series and then is connected between a positive bus of the UPS and a negative bus of the UPS to form a current-limiting charging loop; a current-limiting resistor short-circuit switch which is connected to the current-limiting resistor in parallel and is used for short-circuiting the current-limiting resistor in a conductive manner when a bus voltage of the UPS reaches a first preset voltage; and a storage battery protective switch which is connected to the current-limiting charging loop in series and is used for cutting off the current-limiting charging loop when a mains supply is not connected to the UPS and a voltage of the storage battery of the UPS reduces to a shutdown voltage of a system of the UPS. The storage battery protective switch can cut off a closed circuit which is formed between the storage battery and a bus through the current-limiting resistor so that a continuous small current output of the storage battery is avoided when the UPS is powered off, thereby protecting the storage battery from being damaged due to the continuous small current output.
Description
Technical field
The utility model relates to UPS cold start-up technical field, is specifically related to a kind of UPS cold start-up circuit.
Background technology
UPS(uninterrupted power supply) generally all there is cold start function, by the storage battery of UPS, to the bus of UPS, charge to start UPS under without civil power input condition.The bus of UPS has generally been connected to the storage capacitor of the effect of energy storage and filtering, the general capacitance of storage capacitor is larger, before UPS starts, the initial voltage of storage capacitor is zero, therefore when starting UPS, if directly input voltage is received in bus and may be produced excessive impulse current, excessive impulse current not only may burn fuse and cause UPS to quit work, and even may damage UPS.The inverter of UPS need to just can have inversion output after bus voltage reaches the inversion cut-in voltage of inverter, in order to prevent excessive impulse current, at UPS, start and need to bus, charge lentamente early stage, the voltage of bus and storage capacitor is progressively raise, commonplace way is the current-limiting resistance of connecting between storage battery and bus, at UPS, start and by this current-limiting resistance, come Limited Current size to prevent excessive impulse current early stage, give current-limiting resistance a switch in parallel simultaneously, when the voltage of bus and storage capacitor rises to while being enough to make inverter to produce inversion output, just closed this switch is with short circuit current-limiting resistance, UPS has just entered normal operating conditions like this.
When UPS does not have civil power access, the storage battery of UPS substitutes the task that civil power is born power supply, in the process of battery discharging, its voltage also slowly reduces, when the voltage of storage battery is during lower than the shutdown voltage of the system of UPS, UPS shutdown, although now also disconnected with the switch for short circuit current-limiting resistance of current-limiting resistance parallel connection, but the storage battery of UPS can also form path by current-limiting resistance and bus, owing to there is no civil power access, therefore the storage battery of UPS still can charge to bus and storage capacitor by current-limiting resistance after UPS shutdown, this lasting low discharging current may damage storage battery, the battery capacity of UPS is generally all larger, cost is also higher, the damaged meeting of storage battery causes larger economic loss.
Summary of the invention
The purpose of this utility model with overcome the problems referred to above, provide a kind of can be in the situation that UPS accesses without civil power, the voltage drop of storage battery causes the UPS cold start-up circuit of protection storage battery after UPS shutdown.
For achieving the above object, the utility model provides following technical scheme.
UPS cold start-up circuit, comprise current-limiting resistance, current-limiting resistance is connected to after connecting with the storage battery of described UPS between the positive bus of described UPS and the negative bus of described UPS to form current-limiting charge loop, this UPS cold start-up circuit also comprises in parallel with current-limiting resistance, for when the bus voltage of described UPS reaches the first predeterminated voltage conducting with the current-limiting resistance shorting switch of short circuit current-limiting resistance, this UPS cold start-up circuit also comprises and being connected in current-limiting charge loop, cut off the accumulator protecting switch in current-limiting charge loop when being down to the shutdown voltage of system of described UPS without the voltage of the storage battery of civil power access and described UPS at described UPS.
Wherein, accumulator protecting switch is metal-oxide-semiconductor or air switch.
The inversion cut-in voltage of the inverter that wherein, the first predeterminated voltage is described UPS.
The beneficial effects of the utility model are: accumulator protecting switch is set and connects with current-limiting resistance; in the situation that UPS accesses without civil power; storage battery drops causes after UPS shutdown; accumulator protecting switch cuts off storage battery by the path forming between current-limiting resistance and bus; storage battery can not be charged to bus and storage capacitor after UPS shutdown; storage battery does not just have lasting little electric current output yet, thereby has protected storage battery not because this lasting little electric current output is impaired.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of UPS cold start-up circuit of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
As shown in Figure 1, UPS cold start-up circuit of the present utility model, comprise current-limiting resistance R1 and current-limiting resistance shorting switch K1, current-limiting resistance R1 is connected to after connecting with the storage battery BAT of described UPS between the positive bus B US+ of described UPS and the negative bus B US-of described UPS to form current-limiting charge loop, at the UPS cold start-up initial stage, bus and the storage capacitor C1 to UPS slowly charges in current-limiting charge loop, as shown in Figure 1, current-limiting resistance shorting switch K1 is in parallel with current-limiting resistance R1, current-limiting resistance shorting switch K1 conducting when the bus voltage of described UPS reaches the inversion cut-in voltage of inverter of described UPS, with short circuit current-limiting resistance, R1 makes UPS enter normal operating conditions.As shown in Figure 1; UPS cold start-up circuit of the present utility model also comprises the accumulator protecting K switch 2 being connected in current-limiting charge loop; in the present embodiment; accumulator protecting K switch 2 is metal-oxide-semiconductor, cuts off current-limiting charge loop when accumulator protecting K switch 2 is down to the shutdown voltage of system of described UPS without the voltage of the storage battery BAT of civil power access and described UPS at described UPS.Control unit can be set to be controlled current-limiting resistance shorting switch K1 and accumulator protecting K switch 2; also can current-limiting resistance shorting switch K1 and accumulator protecting K switch 2 be controlled by the CPU of the system of UPS; in the present embodiment; current-limiting resistance shorting switch K1 and accumulator protecting K switch 2 are not shown by the CPU(of the system of UPS) control, to reduce costs.Accumulator protecting K switch 2 is set connects with current-limiting resistance R1; in the situation that UPS accesses without civil power; storage battery BAT voltage drop causes after UPS shutdown; accumulator protecting K switch 2 is cut off storage battery BAT by the path forming between current-limiting resistance R1 and bus; storage battery BAT can not be charged to bus and storage capacitor C1 after UPS shutdown; storage battery BAT does not just have lasting little electric current output yet, thereby has protected storage battery BAT not because this lasting little electric current output is impaired.
When accumulator protecting K switch 2 is metal-oxide-semiconductor; it can not manually be controlled by user; for realizing the manual control to accumulator protecting K switch 2; accumulator protecting K switch 2 also can be arranged to the air switch of manually controlling; the system of UPS can not be controlled the break-make of this air switch; but can send cue to user, user can come manual operation as the break-make of the air switch of accumulator protecting K switch 2 according to the cue of the system of UPS.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not restriction to the utility model protection range; although the utility model has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not depart from essence and the scope of technical solutions of the utility model.
Claims (3)
1.UPS cold start-up circuit, comprise current-limiting resistance, current-limiting resistance is connected to after connecting with the storage battery of described UPS between the positive bus of described UPS and the negative bus of described UPS to form current-limiting charge loop, this UPS cold start-up circuit also comprises in parallel with current-limiting resistance, for when the bus voltage of described UPS reaches the first predeterminated voltage conducting with the current-limiting resistance shorting switch of short circuit current-limiting resistance, it is characterized in that: this UPS cold start-up circuit also comprises and being connected in current-limiting charge loop, cut off the accumulator protecting switch in current-limiting charge loop when being down to the shutdown voltage of system of described UPS without the voltage of the storage battery of civil power access and described UPS at described UPS.
2. UPS cold start-up circuit according to claim 1, is characterized in that: accumulator protecting switch is metal-oxide-semiconductor or air switch.
3. UPS cold start-up circuit according to claim 1, is characterized in that: the inversion cut-in voltage of the inverter that the first predeterminated voltage is described UPS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420023149.7U CN203813461U (en) | 2014-01-15 | 2014-01-15 | UPS cold start circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420023149.7U CN203813461U (en) | 2014-01-15 | 2014-01-15 | UPS cold start circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203813461U true CN203813461U (en) | 2014-09-03 |
Family
ID=51452169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420023149.7U Expired - Lifetime CN203813461U (en) | 2014-01-15 | 2014-01-15 | UPS cold start circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203813461U (en) |
-
2014
- 2014-01-15 CN CN201420023149.7U patent/CN203813461U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140903 |