CN103698581A - Voltage detection circuit and Bluetooth device - Google Patents
Voltage detection circuit and Bluetooth device Download PDFInfo
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- CN103698581A CN103698581A CN201310746281.0A CN201310746281A CN103698581A CN 103698581 A CN103698581 A CN 103698581A CN 201310746281 A CN201310746281 A CN 201310746281A CN 103698581 A CN103698581 A CN 103698581A
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Abstract
The invention discloses a voltage detection circuit and a Bluetooth device. The voltage detection circuit comprises a voltage division circuit, a first switching circuit and a second switching circuit for controlling the on state of the first switching circuit, detection voltage is outputted after supply voltage passes through the first switch circuit and is divided by the voltage division circuit sequentially, and the on state of the second switching circuit is controlled by the control signal of an external device. Because the voltage detection circuit adopts the second switching circuit to indirectly control the on-off state of the supply voltage output circuit, the stability of the on-off state of the supply voltage output circuit is not limited by a control signal output range anymore, and thereby the voltage detection circuit can be fully suitable for Bluetooth chips with different control voltage output ranges; the voltage detection precision is high, and the circuit structure is simple.
Description
Technical field
The invention belongs to voltage detecting circuit technical field, specifically, relate to a kind of low power consumption voltage testing circuit and use the low-power consumption bluetooth equipment of this circuit.
Background technology
In low-power consumption (BLE) bluetooth equipment, in order to detect voltage, often adopt the circuit shown in Fig. 1 at present.This voltage detecting circuit comprises divider resistance R1 and R2, enhancement mode NMOS pipe, and filter capacitor C1.The R1 of divider resistance and the effect of R2 are to make supply voltage VBAT scaled in the measurement range of ADC pin ADC_TEST.NMOS, as a measurement switch, is subject to programmed control, and when needs detect voltage, ADC_EN is high level; Otherwise ADC_EN is low level.C1 filter capacitor energy, filter out power noise, the voltage that allows ADC_TEST collect is more steady.
But the reference voltage detection of low-power consumption Bluetooth chip ADC interface is generally 0～1.35V at present.In order to guarantee that ADC interface input detects the precision of voltage, can not allow again the too many electric current of divider resistance consumption, the divider resistance scope 10K～100K conventionally selecting.In order to detect cell voltage, allow R1=60K, R2=20K, the full electric 4.2V of battery, ADC_EN exports high level, and NMOS pipe is opened, and the voltage that ADC_TEST detects is 1.05V.When the PIO of BLE chip is output as 3V, can open NMOS and allow it enter saturation operation mode.But, when the PIO(of BLE chip controls voltage) and while being output as 1.35V, too little with the pressure reduction of AED_TEST, will affect the on state characteristic of nmos switch, thereby affect the measuring accuracy of ADC.
Based on this, how to invent a kind of voltage detecting circuit, can accurately detect low power consuming devices voltage, be the technical matters that the present invention mainly solves.
Summary of the invention
The present invention detects the low problem of voltage detecting precision of low power dissipation electron device in order to solve existing voltage detecting circuit, a kind of voltage detecting circuit and bluetooth equipment are provided, and accuracy of detection is high, and circuit structure is simple.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of voltage detecting circuit, comprise bleeder circuit, the first on-off circuit and for controlling the second switch circuit of described the first on-off circuit conducting state, supply voltage is output detections voltage after the first on-off circuit and bleeder circuit dividing potential drop successively, and the conducting state of described second switch circuit is accepted the control of peripheral control signal.
Further, the first described on-off circuit comprises a PMOS pipe.
Further again, described bleeder circuit comprises the first resistance (R1) and the second resistance (R2), the drain electrode of described PMOS pipe is connected with supply voltage lead-out terminal after connecting the first resistance (R1), a wherein road of source electrode is connected with ground end after connecting the second resistance (R2), an other road output detections voltage, grid receives the control signal that described second switch circuit sends.
Further again, described second switch circuit comprises a NMOS pipe, and the drain electrode of this NMOS pipe is connected with the grid of described PMOS pipe, and the grid of NMOS pipe connects peripheral control signal lead-out terminal, and source electrode is connected with ground end.
Preferably, described bleeder circuit also comprises the 3rd resistance (R3), and the 3rd resistance (R3) is connected between supply voltage lead-out terminal and the drain electrode of NMOS pipe.
Preferably, also comprise a filter capacitor, the detection voltage output end sub-connection of this filter capacitor one end and bleeder circuit, one end is connected with ground end in addition.
A kind of voltage detecting circuit based on above-mentioned, the present invention provides a kind of bluetooth equipment simultaneously, comprise voltage detecting circuit and Bluetooth chip, described voltage detecting circuit comprises bleeder circuit, the first on-off circuit and for controlling the second switch circuit of described the first on-off circuit conducting state, after the first on-off circuit and bleeder circuit dividing potential drop, output detections voltage is to the detection voltage input end of Bluetooth chip successively for supply voltage, and the conducting state of described second switch circuit is accepted the control of the control signal of Bluetooth chip transmission.
Further, the first described on-off circuit comprises a PMOS pipe, described bleeder circuit comprises the first resistance (R1) and the second resistance (R2), the drain electrode of described PMOS pipe is connected with supply voltage lead-out terminal after connecting the first resistance (R1), a wherein road of source electrode is connected with ground end after connecting the second resistance (R2), the detection voltage input end sub-connection of an other road and Bluetooth chip, grid receives the control signal that described second switch circuit sends.
Further again, described second switch circuit comprises a NMOS pipe, and the drain electrode of this NMOS pipe is connected with the grid of described PMOS pipe, and the grid of NMOS pipe connects the control signal lead-out terminal of Bluetooth chip, and source electrode is connected with ground end.
Compared with prior art, advantage of the present invention and good effect are: voltage detecting circuit of the present invention, adopt an indirect second switch to control the on off operating mode of supply voltage output loop, make the no longer restriction of suspension control signal output area of stability of supply voltage output loop on off operating mode, the Bluetooth chip that can be applicable to different PIO output voltages completely, voltage detecting precision is high, and circuit structure is simple.
Read by reference to the accompanying drawings after the detailed description of embodiment of the present invention, it is clearer that the other features and advantages of the invention will become.
Accompanying drawing explanation
Fig. 1 is prior art voltage detecting circuit schematic diagram;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of a kind of bluetooth equipment with voltage detecting circuit proposed by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in more detail.
For current low power-consumption intelligent equipment voltage detecting circuit, adopt a NMOS pipe as on-off circuit, by smart machine, to the grid output of NMOS pipe, control voltage PIO, control signal as cut-in voltage testing circuit break-make, the source electrode of NMOS pipe is connected with the detection voltage input end of smart machine, the scope that this detection voltage input end requires input to detect magnitude of voltage is generally 0～1.35V, for different low power-consumption intelligent equipment, its PIO output voltage range is not at 1.35～3V etc., therefore, current voltage detecting circuit structure exists when PIO output voltage is too high, causing NMOS pipe to enter saturation operation mode cannot normally work, when PIO output voltage is too low, cause grid and the source electrode pressure reduction of NMOS pipe too little, will affect the on state characteristic of nmos switch, and then affect the problem of supply voltage measuring accuracy, the invention provides a kind of voltage detecting circuit, comprise bleeder circuit, the first on-off circuit, and for controlling the second switch circuit of described the first on-off circuit conducting state, supply voltage is successively through the first on-off circuit, and output detections voltage after bleeder circuit dividing potential drop, the conducting state of described second switch circuit is accepted the control of peripheral control signal PIO output voltage.Voltage detecting circuit of the present invention, adopt an indirectly on off operating mode for second switch control supply voltage output loop, make the no longer restriction of the magnitude of voltage output area of suspension control signal of stability of supply voltage output loop on off operating mode, the Bluetooth chip that can be applicable to different PIO output voltages completely, voltage detecting precision is high, and circuit structure is simple.
This voltage detecting circuit is applicable to any low power-consumption intelligent terminal device, as zegbee low-consumption power collecting device, low-power consumption bluetooth equipments etc., will take low-power consumption bluetooth equipment below as example, describe the principle of voltage detecting circuit of the present invention and obtained technique effect in detail.
Embodiment mono-, shown in Figure 1, the bluetooth equipment of the present embodiment comprises voltage detecting circuit and Bluetooth chip U1, the ADC_EN pin of this Bluetooth chip U1 is PIO voltage output end, the conducting state of the Control of Voltage second switch circuit that it is exported, described voltage detecting circuit comprises bleeder circuit, the first on-off circuit, the conducting state of second switch circuit is controlled the conducting state of the first on-off circuit, supply voltage successively after the first on-off circuit and bleeder circuit dividing potential drop output detections voltage to the detection voltage input end ADC_TEST of Bluetooth chip U1.
As a specific embodiment, in the present embodiment, the first on-off circuit comprises a PMOS pipe Q1, described bleeder circuit comprises the first resistance R 1 and the second resistance R 2, after connecting the first resistance R 1, the drain electrode of described PMOS pipe Q1 is connected with supply voltage lead-out terminal VBAT, a wherein road of source electrode is connected with ground end after connecting the second resistance R 2, an other road is connected with the sub-ADC_TEST of detection voltage input end of Bluetooth chip U1, and grid receives the control signal that described second switch circuit sends.
Second switch circuit comprises a NMOS pipe Q2, and the drain electrode of this NMOS pipe Q2 is connected with the grid of described PMOS pipe Q1, and the grid of NMOS pipe Q2 connects the control signal lead-out terminal ADC_EN of Bluetooth chip, and source electrode is connected with ground end.The detection principle of the voltage detecting circuit of the present embodiment is: when needs detect voltage, ADC_EN exports high level, now the grid of Q2 and the voltage between source electrode are the level of ADC_EN output, the pin driving force of low-power consumption Bluetooth chip is 1.35V or 1.8V, therefore Q2 conducting, corresponding Q1 grid voltage is dragged down, Q1 conducting thereupon.When not needing to detect voltage, ADC_EN closes, so Q2 cut-off, the VBAT that the grid of Q1 is drawn high, so Q1 cut-off.The present embodiment is by setting up an on-off circuit Q2, Q2 accepts the control signal that Bluetooth chip U1 sends on the one hand, be not re-used as on the one hand in addition the direct gauge tap of controlling voltage detecting circuit, and as indirect gauge tap, because the source electrode of Q2 is held and is connected with ground, there will not be because the grid of Q2 is because the magnitude of voltage of input is little, corresponding source electrode and grid voltage are poor little and cause affecting the on state characteristic of Q2, and then affect the problem of supply voltage measuring accuracy, therefore, the accuracy of detection of this voltage detecting circuit is high.
In order to stablize NMOS pipe Q2 drain electrode input voltage, described bleeder circuit also comprises the 3rd resistance R 3, the 3rd resistance R 3 is connected between supply voltage lead-out terminal and the drain electrode of NMOS pipe, for the voltage being carried on Q2 is carried out to dividing potential drop, guarantees that it normally works.
For filtering detects the ripple in voltage, also comprise a filter capacitor C1, this filter capacitor C1 one end is connected with the detection Voltage-output terminal ADC_TEST of bleeder circuit, and one end is connected with ground end in addition.
In addition; for PMOS pipe Q1 is carried out to electrostatic protection; between the grid of described PMOS pipe Q1 and drain electrode, be also connected with the first commutation diode D1; between source electrode and drain electrode, be connected with the first diode M1; the positive pole of this first diode M1 is connected with the source electrode of PMOS pipe, and the negative pole of the first diode M1 is connected with the drain electrode of PMOS pipe.
As a same reason; for NMOS pipe Q2 is carried out to electrostatic protection; between the grid of described NMOS pipe Q2 and source electrode, be also connected with the second commutation diode D2; between source electrode and drain electrode, be connected with the second diode M2; the positive pole of this second diode M2 is connected with the source electrode of NMOS pipe, and the negative pole of the second diode M2 is connected with the drain electrode of NMOS pipe.
Certainly, above embodiment is only in order to technical scheme of the present invention to be described, but not is limited; Although the present invention is had been described in detail with reference to previous embodiment, for the person of ordinary skill of the art, the technical scheme that still can record previous embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of the present invention's technical scheme required for protection.
Claims (10)
1. a voltage detecting circuit, it is characterized in that: comprise bleeder circuit, the first on-off circuit and for controlling the second switch circuit of described the first on-off circuit conducting state, supply voltage is output detections voltage after the first on-off circuit and bleeder circuit dividing potential drop successively, and the conducting state of described second switch circuit is accepted the control of peripheral control signal.
2. voltage detecting circuit according to claim 1, is characterized in that: the first described on-off circuit comprises a PMOS pipe.
3. voltage detecting circuit according to claim 2, it is characterized in that: described bleeder circuit comprises the first resistance (R1) and the second resistance (R2), the drain electrode of described PMOS pipe is connected with supply voltage lead-out terminal after connecting the first resistance (R1), a wherein road of source electrode is connected with ground end after connecting the second resistance (R2), an other road output detections voltage, grid receives the control signal that described second switch circuit sends.
4. voltage detecting circuit according to claim 2, it is characterized in that: described second switch circuit comprises a NMOS pipe, the drain electrode of this NMOS pipe is connected with the grid of described PMOS pipe, and the grid of NMOS pipe connects peripheral control signal lead-out terminal, and source electrode is connected with ground end.
5. voltage detecting circuit according to claim 4, is characterized in that: described bleeder circuit also comprises the 3rd resistance (R3), and the 3rd resistance (R3) is connected between supply voltage lead-out terminal and the drain electrode of NMOS pipe.
6. according to the voltage detecting circuit described in claim 1-5 any one claim, it is characterized in that: also comprise a filter capacitor, the detection voltage output end sub-connection of this filter capacitor one end and bleeder circuit, one end is connected with ground end in addition.
7. a bluetooth equipment, comprise voltage detecting circuit and Bluetooth chip, it is characterized in that: described voltage detecting circuit comprises bleeder circuit, the first on-off circuit and for controlling the second switch circuit of described the first on-off circuit conducting state, after the first on-off circuit and bleeder circuit dividing potential drop, output detections voltage is to the detection voltage input end of Bluetooth chip successively for supply voltage, and the conducting state of described second switch circuit is accepted the control of the control signal of Bluetooth chip transmission.
8. bluetooth equipment according to claim 7, it is characterized in that: the first described on-off circuit comprises a PMOS pipe, described bleeder circuit comprises the first resistance (R1) and the second resistance (R2), the drain electrode of described PMOS pipe is connected with supply voltage lead-out terminal after connecting the first resistance (R1), a wherein road of source electrode is connected with ground end after connecting the second resistance (R2), the detection voltage input end sub-connection of an other road and Bluetooth chip, grid receives the control signal that described second switch circuit sends.
9. bluetooth equipment according to claim 8, it is characterized in that: described second switch circuit comprises a NMOS pipe, the drain electrode of this NMOS pipe is connected with the grid of described PMOS pipe, and the grid of NMOS pipe connects the control signal lead-out terminal of Bluetooth chip, and source electrode is connected with ground end.
10. bluetooth equipment according to claim 9, it is characterized in that: described bleeder circuit also comprises the 3rd resistance (R3), the 3rd resistance (R3) is connected between supply voltage lead-out terminal and the drain electrode of NMOS pipe, described voltage detecting circuit also comprises a filter capacitor, the detection voltage output end sub-connection of this filter capacitor one end and bleeder circuit, one end is connected with ground end in addition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310746281.0A CN103698581A (en) | 2013-12-30 | 2013-12-30 | Voltage detection circuit and Bluetooth device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310746281.0A CN103698581A (en) | 2013-12-30 | 2013-12-30 | Voltage detection circuit and Bluetooth device |
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| CN103698581A true CN103698581A (en) | 2014-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310746281.0A Pending CN103698581A (en) | 2013-12-30 | 2013-12-30 | Voltage detection circuit and Bluetooth device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683217A (en) * | 2018-04-08 | 2018-10-19 | 中国船舶重工集团公司第七〇九研究所 | The supply voltage monitoring circuit that can be turned off |
| CN111988022A (en) * | 2020-07-31 | 2020-11-24 | 重庆智行者信息科技有限公司 | Automobile PWM output circuit |
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| US20040174206A1 (en) * | 2002-12-20 | 2004-09-09 | Atsuko Matsumura | Voltage detecting circuit |
| CN1617060A (en) * | 2003-11-12 | 2005-05-18 | Atmel德国有限公司 | Circuit arrangement for monitoring a voltage |
| WO2012114278A2 (en) * | 2011-02-22 | 2012-08-30 | Sendyne Corp. | High precision algorithmically assisted voltage divider with fault detection |
| CN103344822A (en) * | 2013-06-26 | 2013-10-09 | 天津成科自动化工程技术有限公司 | Battery voltage monitoring circuit used for battery powered equipment |
| CN203350340U (en) * | 2013-08-10 | 2013-12-18 | 漳州科华技术有限责任公司 | Full-range low power consumption DC voltage detecting circuit |
| CN203658444U (en) * | 2013-12-30 | 2014-06-18 | 青岛歌尔声学科技有限公司 | Voltage detection circuit and Bluetooth device |
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2013
- 2013-12-30 CN CN201310746281.0A patent/CN103698581A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040174206A1 (en) * | 2002-12-20 | 2004-09-09 | Atsuko Matsumura | Voltage detecting circuit |
| CN1617060A (en) * | 2003-11-12 | 2005-05-18 | Atmel德国有限公司 | Circuit arrangement for monitoring a voltage |
| WO2012114278A2 (en) * | 2011-02-22 | 2012-08-30 | Sendyne Corp. | High precision algorithmically assisted voltage divider with fault detection |
| CN103344822A (en) * | 2013-06-26 | 2013-10-09 | 天津成科自动化工程技术有限公司 | Battery voltage monitoring circuit used for battery powered equipment |
| CN203350340U (en) * | 2013-08-10 | 2013-12-18 | 漳州科华技术有限责任公司 | Full-range low power consumption DC voltage detecting circuit |
| CN203658444U (en) * | 2013-12-30 | 2014-06-18 | 青岛歌尔声学科技有限公司 | Voltage detection circuit and Bluetooth device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683217A (en) * | 2018-04-08 | 2018-10-19 | 中国船舶重工集团公司第七〇九研究所 | The supply voltage monitoring circuit that can be turned off |
| CN108683217B (en) * | 2018-04-08 | 2021-08-03 | 中国船舶重工集团公司第七一九研究所 | Power supply voltage monitoring circuit capable of being turned off |
| CN111988022A (en) * | 2020-07-31 | 2020-11-24 | 重庆智行者信息科技有限公司 | Automobile PWM output circuit |
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Application publication date: 20140402 |