CN204304774U - A kind of auxiliary power start and voltage detecting circuit - Google Patents
A kind of auxiliary power start and voltage detecting circuit Download PDFInfo
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- CN204304774U CN204304774U CN201420732749.0U CN201420732749U CN204304774U CN 204304774 U CN204304774 U CN 204304774U CN 201420732749 U CN201420732749 U CN 201420732749U CN 204304774 U CN204304774 U CN 204304774U
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Abstract
The utility model discloses a kind of auxiliary power start and voltage detecting circuit, comprise DC/DC power model, power management chip, the first electric capacity, the first metal-oxide-semiconductor, the first diode, the second diode, power resistor module, the 3rd resistance and the 4th resistance.The utility model only uses one group of power resistor module to achieve auxiliary power start and busbar voltage measuring ability simultaneously, reduce the quantity using power resistor, reduce system power dissipation and circuit cost, decrease the area taking PCB, reduce the wiring difficulty of technician, refer to the reliability of system.
Description
Technical field
The utility model relates to testing circuit technical field, more particularly, and particularly a kind of auxiliary power start and voltage detecting circuit.
Background technology
Usually in complete power-supply system, all there is DC energy storage filtration module and auxiliary power module, as frequency converter, UPS etc.In order to simplify circuit, accessory power supply is usually direct from DC bus power taking, is converted to each road voltage needed for control system.So the starting resistance of accessory power supply is the anode being directly connected to DC bus.In addition in order to the needs of control algolithm and overvoltage, under-voltage protection, need to detect the voltage of DC bus toward contact in such systems.Typical auxiliary power start and voltage detecting mode is shown in Fig. 1.Simply introduce the principle of work of Fig. 1 below.
Vbus is the DC bus-bar voltage of input, and this voltage can be the DC high-voltage power supply that the DC high-voltage power supply of outside input or ac high voltage source are converted to by rectification filtering module.
The accessory power supply that power conversion module U1, power management chip U2, diode D1, electric capacity C1, power resistor R1 and R2 have been formed.During direct current bus bar, DC bus-bar voltage Vbus is charged to C1 by R1, R2, and the voltage of C1 is started from scratch rising.When the voltage rise of C1 is after the trigger voltage of UC284X, UC284X starts working, output drive signal is to DC/DC modular converter, each road output voltage of DC/DC modular converter is progressively set up, and (wherein a road output voltage Vau is while powering to other circuit of system, also power to UC284X, therefore the voltage of Vau is higher than the under-voltage threshold of UC284X).Namely the voltage of Vau progressively rises, and simultaneously the voltage of C1 starts to decline, and by selecting suitable capacitance to C1, before can ensureing voltage drop on C1 to UC284X under-voltage threshold, the voltage of Vau has been set up.At this moment electric charge C1 consumed is supplemented by a wherein road output voltage Vau of U1, and C1 voltage no longer declines, and is stabilized in the current potential of a diode forward pressure drop lower than Vau.The effect of diode D1 prevents in auxiliary power start process, and R1, R2 are shunted by other circuit the charging current of C1, and power management chip UC284X cannot normally be started.
The acquisition technique of DC bus-bar voltage is one of necessary condition realizing power conversion algorithm; simultaneously the superpotential of DC bus and low-voltage protection are also the very important defencive functions of system; therefore must detect the voltage of DC bus; the simplest detection mode is direct resistor voltage divider network in parallel on DC bus, and small-signal dividing potential drop obtained delivers to the control module of system.Namely resistance R3, R4, R5 in Fig. 1 constitute complete busbar voltage testing circuit, and Vsense is the bus voltage signal collected.By adjusting the ratio of R3+R4 and R5, with regard to the ratio of adjustable Vsense and busbar voltage.
Because the start-up circuit of accessory power supply and the testing circuit of busbar voltage are separate, need the power resistor that use two kinds of volumes are comparatively large and cost is higher.Therefore the circuit shown in Fig. 1 also exists following shortcoming: use power resistor to add circuit cost first in a large number; Secondly power resistor will expend larger power, and circuit efficiency is reduced; Last power resistor volume is comparatively large, and power resistor is connected with high voltage, and pcb board must stay larger safety distance, occupies a large amount of PCB spaces, adds PCB layout difficulty.
Utility model content
The purpose of this utility model is to provide a kind of auxiliary power start and voltage detecting circuit, make it have and reduce system power dissipation and circuit cost, decrease the area taking PCB, reduce the wiring difficulty of technician, refer to the function of system reliability.
In order to achieve the above object, the technical solution adopted in the utility model is as follows:
A kind of auxiliary power start and voltage detecting circuit, comprise DC/DC power model, power management chip, the first electric capacity, the first metal-oxide-semiconductor, the first diode, the second diode, power resistor module, the 3rd resistance and the 4th resistance;
The described input end of DC/DC power model is connected with the first end of DC bus, and its control pole is held with the VO of power management chip and is connected, and its any road output terminal is connected with the anode of the first diode; The negative electrode of described first diode is held with the VCC of power management chip and is connected, and the negative electrode of the first diode is also through the first capacity earth; The GND end of described power management chip is also connected with the second end of DC bus;
Described one end of power resistor module is connected with the first end of DC bus, and its other end is connected with the anode of the second diode, and the negative electrode of the second diode is connected with the negative electrode of the first diode;
The source electrode of described first metal-oxide-semiconductor is connected with the anode of the first diode after the 4th resistance, and its drain electrode is connected with the anode of the second diode, and its grid is connected with the second end of DC bus after the 3rd resistance.
Preferably, described power resistor module comprises first resistance and the second resistance of connecting successively, and described one end of first resistance is connected with the first end of DC bus, and its other end is connected with the anode of the second diode by after the second resistance.
Preferably, described first resistance and the second resistance are power resistor, and described 3rd resistance is small-signal resistance.
Preferably, the model of described power management chip is UC284X.
Compared with prior art, the utility model has the advantage of: the utility model only uses one group of power resistor module to achieve auxiliary power start and busbar voltage measuring ability simultaneously, reduce the quantity using power resistor, reduce system power dissipation and circuit cost, decrease the area taking PCB, reduce the wiring difficulty of technician, refer to the reliability of system.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the electrical schematic diagram of existing power-supply system auxiliary power start and voltage detecting circuit;
Fig. 2 is the electrical schematic diagram of power-supply system auxiliary power start of the present utility model and voltage detecting circuit.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail, to make advantage of the present utility model and feature can be easier to be readily appreciated by one skilled in the art, thus more explicit defining is made to protection domain of the present utility model.
Consult shown in Fig. 2, the utility model provides a kind of auxiliary power start and voltage detecting circuit, comprises DC/DC power model U1, power management chip U2, the first electric capacity C1, the first metal-oxide-semiconductor S1, the first diode D1, the second diode D2, power resistor module, the 3rd resistance R3 and the 4th resistance R4.
The input end of described DC/DC power model U1 is connected with the first end of DC bus, and its control pole is held with the VO of power management chip U2 and is connected, and its any road output terminal is connected with the anode of the first diode D1; The described negative electrode of the first diode D1 is held with the VCC of power management chip U2 and is connected, and the negative electrode of the first diode D1 is also through the first electric capacity C1 ground connection; The GND end of described power management chip U2 is also connected with the second end of DC bus; Described one end of power resistor module is connected with the first end of DC bus, and its other end is connected with the anode of the second diode D2, and the negative electrode of the second diode D2 is connected with the negative electrode of the first diode D1; The source electrode of described first metal-oxide-semiconductor S1 is connected with the anode of the first diode D1 after the 4th resistance R4, and its drain electrode is connected with the anode of the second diode D2, and its grid is connected with the second end of DC bus after the 3rd resistance R3.
As preferably, power resistor module in the present embodiment comprises the first resistance R1 and the second resistance R2 that connect successively, one end of described first resistance R1 is connected with the first end of DC bus, and its other end is connected with the anode of the second diode D2 by after the second resistance R2.Further, the serial or parallel connection that power resistor module can be some power resistors according to side circuit forms.
Below principle of the present utility model is described further:
Vbus is the DC bus-bar voltage of input, and this voltage can be the DC high-voltage power supply that the DC high-voltage power supply of outside input or ac high voltage source are converted to by rectification filtering module.
DC/DC power model U1, power management chip U2, the first diode D1, the second diode D2, electric capacity C1, power resistor R1 and R2 form complete accessory power supply.During direct current bus bar, DC bus-bar voltage Vbus is charged to electric capacity C1 by the series loop be made up of R1, R2 and the second diode D2, and the voltage of C1 is started from scratch rising.When the voltage rise of C1 is after the trigger voltage of power management chip U2, power management chip U2 starts working, output drive signal is to DC/DC power model U1, each road output voltage of DC/DC power model U1 is progressively set up, and (wherein a road output voltage Vau is while powering to other circuit of system, also power to power management chip U2, therefore the voltage of Vau is higher than the under-voltage threshold of power management chip U2).Namely the voltage of Vau progressively rises, and simultaneously the voltage of C1 starts to decline, and by selecting suitable capacitance to electric capacity C1, before can ensureing voltage drop on C1 to power management chip U2 under-voltage threshold, the voltage of Vau has been set up.At this moment electric charge C1 consumed is supplemented by a wherein road output voltage Vau of U1, and C1 voltage no longer declines, and is stabilized in the current potential of a diode forward pressure drop lower than Vau.The effect of D1 prevents in auxiliary power start process, and R1, R2 are shunted by other circuit the charging current of C1, and power management chip U2 cannot normally be started.
After power management chip U2 starts working, power resistor R1, R2 complete initiating task, and the energy that the electric current needed at this moment power management chip U2 work is all stored by electric capacity C1 provides.Therefore, when the voltage of Vau reaches the cut-in voltage of the first metal-oxide-semiconductor S1, the first metal-oxide-semiconductor S1 is open-minded.Because the operating voltage of power management chip U2 is higher than 5V, and Vsense is the signal sending into control system, for being less than the voltage of 5V, and the therefore reverse-biased cut-off of the second diode D2.Electric current on resistance R1, R2 all flows through the first metal-oxide-semiconductor S1 and the 3rd resistance R3, and make the 3rd resistance R3 produce the signal proportional with busbar voltage, power resistor R1, R2 are the effect of voltage detecting by the effect transition of power initiation.Now, power resistor R1, R2, small-signal resistance R3 forms voltage detecting circuit (on state resistance of metal-oxide-semiconductor S1 is very little, can ignore the impact that busbar voltage detects).Vsense is required busbar voltage detection signal, is the signal sending into system control unit.And by the ratio of adjustment R1+R2 and R3, with regard to the ratio of adjustable Vsense and busbar voltage, usual R1+R2 is far longer than R3, and Vsense is the voltage signal being less than 5V.
As preferably, the first resistance R1 in the utility model and the second resistance R2 is power resistor, and the 3rd resistance R3 is small-signal resistance.The model of power management chip U2 is UC284X.
Above a kind of auxiliary power start provided by the utility model and voltage detecting circuit are described in detail, apply specific case herein to set forth principle of the present utility model and embodiment, the explanation of above embodiment just understands method of the present utility model and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (4)
1. auxiliary power start and a voltage detecting circuit, is characterized in that: comprise DC/DC power model, power management chip, the first electric capacity, the first metal-oxide-semiconductor, the first diode, the second diode, power resistor module, the 3rd resistance and the 4th resistance;
The described input end of DC/DC power model is connected with the first end of DC bus, and its control pole is held with the VO of power management chip and is connected, and its any road output terminal is connected with the anode of the first diode; The negative electrode of described first diode is held with the VCC of power management chip and is connected, and the negative electrode of the first diode is also through the first capacity earth; The GND end of described power management chip is also connected with the second end of DC bus;
Described one end of power resistor module is connected with the first end of DC bus, and its other end is connected with the anode of the second diode, and the negative electrode of the second diode is connected with the negative electrode of the first diode;
The source electrode of described first metal-oxide-semiconductor is connected with the anode of the first diode after the 4th resistance, and its drain electrode is connected with the anode of the second diode, and its grid is connected with the second end of DC bus after the 3rd resistance.
2. auxiliary power start according to claim 1 and voltage detecting circuit, it is characterized in that: described power resistor module comprises first resistance and the second resistance of connecting successively, described one end of first resistance is connected with the first end of DC bus, and its other end is connected with the anode of the second diode by after the second resistance.
3. auxiliary power start according to claim 2 and voltage detecting circuit, is characterized in that: described first resistance and the second resistance are power resistor, and described 3rd resistance is small-signal resistance.
4. auxiliary power start according to claim 2 and voltage detecting circuit, is characterized in that: the model of described power management chip is UC284X.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420732749.0U CN204304774U (en) | 2014-11-28 | 2014-11-28 | A kind of auxiliary power start and voltage detecting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420732749.0U CN204304774U (en) | 2014-11-28 | 2014-11-28 | A kind of auxiliary power start and voltage detecting circuit |
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| CN204304774U true CN204304774U (en) | 2015-04-29 |
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| CN201420732749.0U Withdrawn - After Issue CN204304774U (en) | 2014-11-28 | 2014-11-28 | A kind of auxiliary power start and voltage detecting circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467394A (en) * | 2014-11-28 | 2015-03-25 | 广州三晶电气有限公司 | Circuit assisting power starting and voltage detecting and controlling method |
| CN105471248A (en) * | 2015-12-23 | 2016-04-06 | 广州三晶电气股份有限公司 | Switching power supply startup circuit |
-
2014
- 2014-11-28 CN CN201420732749.0U patent/CN204304774U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467394A (en) * | 2014-11-28 | 2015-03-25 | 广州三晶电气有限公司 | Circuit assisting power starting and voltage detecting and controlling method |
| CN105471248A (en) * | 2015-12-23 | 2016-04-06 | 广州三晶电气股份有限公司 | Switching power supply startup circuit |
| CN105471248B (en) * | 2015-12-23 | 2017-10-31 | 广州三晶电气股份有限公司 | A kind of Switching Power Supply start-up circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 510663 Guangzhou high tech Industrial Development Zone, Guangdong Science City, litchi Road, No. 9 Patentee after: GUANGZHOU SANJING ELECTRIC CO., LTD. Address before: 510663 Guangzhou high tech Industrial Development Zone, Guangdong Science City, litchi Road, No. 9 Patentee before: Guangzhou Sanjing Electric Co., Ltd. |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20150429 Effective date of abandoning: 20160824 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |