WO2018201432A1 - 电压转换装置和指纹检测系统 - Google Patents

电压转换装置和指纹检测系统 Download PDF

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Publication number
WO2018201432A1
WO2018201432A1 PCT/CN2017/083176 CN2017083176W WO2018201432A1 WO 2018201432 A1 WO2018201432 A1 WO 2018201432A1 CN 2017083176 W CN2017083176 W CN 2017083176W WO 2018201432 A1 WO2018201432 A1 WO 2018201432A1
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Prior art keywords
switch
capacitor
voltage conversion
sensor
switches
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PCT/CN2017/083176
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English (en)
French (fr)
Inventor
肖瑜
易福建
阙滨城
凌伟
Original Assignee
深圳市汇顶科技股份有限公司
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Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to PCT/CN2017/083176 priority Critical patent/WO2018201432A1/zh
Priority to CN201780000385.3A priority patent/CN107223303B/zh
Publication of WO2018201432A1 publication Critical patent/WO2018201432A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing

Definitions

  • the present application relates to the field of biometrics, and in particular, to a voltage conversion device and a fingerprint detection system.
  • fingerprint chips need to support higher and higher cover thickness.
  • Some mobile phone manufacturers require fingerprint chips to support implicit fingerprints (UnderGlass) for mobile phone aesthetics and waterproofing. Due to the limitation of the battery voltage of mobile phones, the current supply voltage of the fingerprint chip is generally 2.8-3.3V. Under this voltage, it is difficult to ensure the performance of the capacitive fingerprint chip, and effectively increasing the coding voltage becomes a key factor of its performance.
  • Capacitive fingerprint chips generally use an inductive boost circuit to achieve voltage boost.
  • the feature is that the inductor and the modulation device are used to increase the voltage of the fingerprint chip by using the charging and discharging process of the inductor.
  • it since it uses an inductor as a boosting device, it cannot be integrated into an integrated circuit, and the inductor is not suitable for packaging into the chip due to size limitation, and if more capacitors are used, the size of the integrated circuit will be increased.
  • the present application provides a voltage conversion device and a fingerprint detection system, which can realize a floating voltage of a power supply voltage and improve the signal amount of an existing fingerprint chip, thereby improving the reliability of the entire system.
  • a voltage conversion device in a first aspect, includes: a first input terminal, a second input terminal, a third input terminal, a first capacitor, a second capacitor, a first output terminal, and a second output terminal.
  • the first input terminal is connected to the first input power source
  • the second input terminal is connected to the second input power source
  • the third input terminal is connected to the third input power source.
  • the first end of the first capacitor is connected to the first input end, the second end of the first capacitor is grounded, and the first end of the second capacitor is respectively connected to the second input
  • the end is connected to the first output end, and the second end of the second capacitor is connected to the second output end and the ground respectively;
  • the second end of the first capacitor is connected to the third input end, and the first end of the first capacitor is respectively opposite to the second output end and the second capacitor Two Connected to the end, the first end of the second capacitor is connected to the first output end;
  • the first end of the first capacitor is grounded, and the second end of the first capacitor is respectively connected to the first output end and the first end of the second capacitor, the first The second end of the second capacitor is connected to the second output, and the third moment is after the first moment.
  • the voltage conversion device may be in a charging moment at a first moment, in a first discharging state at a second moment, and in a second discharging state at a third moment.
  • the second time and the third time may be after the first time, and the third time may be before the second time, and the third time may be after the second time.
  • the voltage conversion device of the embodiment of the present application uses a small amount of capacitance to realize the floating of the power supply voltage, and enhances the amount of the fingerprint signal, and at the same time enables the voltage conversion device to be well integrated into the circuit or packaged into the chip to reduce the peripheral device. Dependency, improving the reliability of the entire system.
  • the voltage conversion device further includes a first group of switches, a second group of switches, and a third group of switches for controlling the voltage conversion device in the state of charge The first discharge state and the second discharge state are switched.
  • the voltage conversion device when only the first group of switches is closed, the voltage conversion device is in the charging state, and when only the second group of switches is closed The voltage conversion device is in the first discharge state. The voltage conversion device is in the second discharge state when only the third group of switches is closed.
  • the first group of switches, the second group of switches, and the third group of switches are implemented by eight switches.
  • the eight switches include a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, and an eighth switch.
  • the first end of the first capacitor and the first switch, the second switch, and the third switch of the eight switches respectively Connected to one end, the other end of the first switch is connected to the first input power source, the other end of the second switch is grounded, and the other end of the third switch is connected to the second output end, the first capacitor
  • the two ends are respectively connected to one ends of the fourth switch, the fifth switch and the sixth switch of the eight switches, the other end of the fourth switch is connected to the third input power source, and the other end of the fifth switch is grounded.
  • the other end of the sixth switch is connected to the first output end, and the first end of the second capacitor is respectively connected to one end of the seventh switch of the eight switches and the first output end, and the other end of the seventh switch One end is connected to the second input power source, and the second end of the second capacitor is respectively connected to the second output end and the eighth of the eight switches One end of the eight switch is connected, and the other end of the eighth switch is grounded.
  • the first group of switches includes the first switch, the fifth switch, the seventh switch, and the eighth switch
  • the two sets of switches include the third switch and the fourth switch
  • the third set of switches includes the second switch and the sixth switch.
  • At least one of the eight switches is a metal-oxide-semiconductor field effect transistor.
  • the voltage conversion apparatus further includes a timing controller, where the timing controller is configured to control the first group of switches, the second The switching state of the group switch and the third group of switches.
  • the voltage conversion device when the timing controller outputs the first signal, the voltage conversion device is in a first discharging state, and when the timing controller outputs the first In the case of two signals, the voltage conversion device is in a second discharge state.
  • the voltage conversion device of the embodiment of the present application uses a small amount of capacitance to realize the floating of the power supply voltage, so that the voltage conversion device can be better integrated into the circuit or packaged into the chip, and can be used to boost the supply voltage for the fingerprint chip and improve
  • the performance of the entire fingerprint chip reduces the dependence on peripheral devices and improves the reliability of the entire system.
  • a fingerprint detection system comprising a fingerprint sensor and a first aspect and a voltage conversion device in various implementations of the first aspect, wherein the voltage conversion device is coupled to the fingerprint sensor for A supply voltage is provided for the fingerprint sensor.
  • the fingerprint sensor includes a sensor power terminal and a sensor ground, wherein the sensor power terminal is coupled to the first output of the voltage conversion device, A sensor ground is coupled to the second output of the voltage conversion device.
  • the fingerprint sensor further includes a sensor circuit, an operational amplifier, and an integrating capacitor, where the sensor circuit is configured to collect fingerprint information, and the connection is And to the sensor ground terminal, and connected to the inverting input terminal of the operational amplifier through a first sensor switch, and connected to the sensor power supply terminal through a second sensor switch; the non-inverting input terminal of the operational amplifier is used Receiving a reference voltage; the integrating capacitor is coupled between an output of the operational amplifier and the inverting input.
  • the fingerprint detecting system further includes a reset switch, the reset switch being connected at two ends of the integrating capacitor.
  • a detection system comprising a sensor and a voltage conversion circuit, the voltage conversion circuit being coupled to the sensor for providing a supply voltage to the sensor; the voltage conversion circuit comprising a first a capacitor and a second capacitor, wherein the two ends of the second capacitor are respectively connected to the first output end and the second output end of the voltage conversion circuit; after the charging is completed, the two ends of the first capacitor have the first Inputting a voltage of the power source, and both ends of the second capacitor have a voltage of the second input power source; the first capacitor is configured to receive a voltage of the third input power source in the first discharging state and to the second output end And increasing a voltage to a voltage sum of the first input power source and the third input power source, and pulling a voltage of the first output terminal to a negative voltage of the first input power source in a second discharging state; The capacitor maintains the voltage of the second input power source at both ends thereof in the first discharge state and the second discharge state.
  • the senor includes a sensor power terminal and a sensor ground, wherein the sensor power terminal is coupled to the first output of the voltage conversion circuit, the sensor A ground terminal is coupled to the second output of the voltage conversion circuit.
  • the senor further includes a sensor circuit, an operational amplifier, and an integrating capacitor, where the sensor circuit is configured to collect fingerprint information, and is connected to The sensor ground terminal is connected to the inverting input terminal of the operational amplifier through a first sensor switch, and is connected to the sensor power supply terminal through a second sensor switch; the non-inverting input terminal of the operational amplifier is used for receiving a reference voltage; the integrating capacitor being coupled between an output of the operational amplifier and the inverting input.
  • the voltage conversion circuit includes a first input end, a second input end, and a third input end, respectively connected to the first input a power source, the second input power source, and the third input power source; the first end of the first capacitor is connected to the first input end when the voltage conversion circuit is in a charging state, the first The second end of the second capacitor is connected to the second input end and the first output end, and the second end of the second capacitor is respectively connected to the second output Connecting the ground to the ground; when the voltage conversion circuit is in the first discharge state, the second end of the first capacitor is connected to the third input end, and the first end of the first capacitor is respectively associated with the first The second output is connected to the second end of the second capacitor, the first end of the second capacitor is connected to the first output end; when the voltage conversion circuit is in the second discharge state, the first The first end of the capacitor is grounded, the second end of the first capacitor is connected to the first end of the first capacitor and the second
  • the voltage conversion circuit further includes a first group of switches, a second group of switches, and a third group of switches for controlling the voltage The switching circuit switches between the state of charge, the first state of discharge, and the state of the second state of discharge.
  • the first group of switches, the second group of switches, and the third group of switches are implemented by eight switches.
  • the eight switches include a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, and an eighth switch.
  • the first end of the first capacitor is respectively associated with the first switch, the second switch, and the third switch
  • One end of the first switch is connected to the first input power source, the other end of the second switch is grounded, and the other end of the third switch is connected to the second output end
  • a second end of the first capacitor is connected to one ends of the fourth switch, the fifth switch and the sixth switch, and the other end of the fourth switch is connected to the third input power source, The other end of the fifth switch is grounded, and the other end of the sixth switch is connected to the first output end
  • the first end of the second capacitor is respectively connected to one end of the seventh switch and the first output end
  • the other end of the seventh switch is connected to the second input power source
  • the first group of switches includes the first switch, the fifth switch, the seventh switch, and the first Eight a switch; the second set of switches includes the third switch and the fourth switch; and the third set of switches includes the second switch and the sixth switch.
  • the voltage conversion circuit further includes a timing controller, where the timing controller is configured to control the first group of switches, the first a switching state of the two sets of switches and the third set of switches; wherein, when the timing controller outputs the first signal, the voltage conversion circuit is in a first discharging state, and when the timing controller outputs the second signal The voltage conversion circuit is in a second discharge state.
  • FIG. 1 is a schematic diagram of a voltage conversion device in accordance with an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a fingerprint chip in accordance with an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a fingerprint detection system in accordance with an embodiment of the present application.
  • FIG. 1 shows a schematic diagram of a voltage conversion device 100 in accordance with an embodiment of the present application.
  • the voltage conversion device 100 can include: three input terminals, two capacitors, and two output terminals, wherein the three input terminals are a first input terminal, a second input terminal, and a third input terminal, respectively.
  • the input terminals are respectively connected to an input power source.
  • the first input terminal is connected to the first input power source, that is, the analog power source AVDD 1
  • the second input terminal is connected to the second input power source AVDD 2
  • the third input terminal is connected.
  • the third input power source AVDD 3 the voltage values of the three input power sources can be equal; the two capacitors are respectively the first capacitor C1 and the second capacitor C2 as shown in FIG. 1; the two output ends are respectively as shown in FIG. The first output and the second output.
  • the voltage conversion device 100 is in a charging state, that is, charging the first capacitor C1 and the second capacitor C2.
  • the first end of the first capacitor C1 is connected to the first input power AVDD1 of the first input end
  • the second end of the first capacitor C1 is grounded to GND
  • the first end of the second capacitor C2 is respectively connected to the second input end
  • the second input power source AVDD2 is connected to the first output terminal
  • the second terminal of the second capacitor C2 is connected to the second output terminal and the ground GND, respectively.
  • the voltage difference is equal to the voltage of the first input power source AVDD1; after the second capacitor is charged, the first end of the second capacitor C2 is charged. And a second end having a voltage difference equal to a voltage of the second input power source AVDD2; When the second output terminal is grounded to GND, the output voltage is zero, and the output voltage of the first output terminal is the voltage of the second input power source AVDD2.
  • the voltage conversion device 100 is in a first discharge state.
  • the second time occurs after the first time, that is, after the first capacitor C1 and the second capacitor C2 are completed.
  • the first discharge state the second end of the first capacitor C1 is connected to the third input power AVDD3 of the third input terminal, and the first end of the first capacitor C1 is respectively connected to the second output terminal and the second capacitor C2 The two ends are connected, and the first end of the second capacitor C2 is connected to the first output end.
  • the voltage value of the second output terminal is equal to the voltage value of the third input power source AVDD3 of the third input terminal and the first
  • the capacitor C1 has a sum of voltage differences, and the voltage difference across the first capacitor is equal to the voltage of the first input power source AVDD1, so the voltage value of the second output terminal is equal to the voltage value of the third input power source AVDD3 and the voltage of the first input power source AVDD1. The sum of the values.
  • the voltage value of the first output terminal is equal to the sum of the voltage of the first input power source AVDD1, the voltage of the second input power source AVDD2, and the voltage of the third input power source AVDD3.
  • the voltage values of the first input power source AVDD1, the second input power source AVDD2, and the third input power source AVDD3 are equal, for example, equal to V, in the first discharging state, the voltage of the first output terminal is equal to 3V, and the voltage of the second output terminal is equal to 2V.
  • the voltage conversion device 100 is in the second discharge state.
  • the third time occurs after the first time, that is, after the first capacitor C1 and the second capacitor C2 complete charging.
  • the first end of the first capacitor C1 is grounded to GND, and the second end of the first capacitor C1 is respectively connected to the first output end and the first end of the second capacitor C2, and the second capacitor C2 is The two ends are connected to the second output.
  • the third moment may be after the second moment, or before the second moment, and the embodiment of the present application is not limited thereto.
  • the voltage of the first output terminal is equal to the negative first
  • the voltage difference across the first capacitor C1 is equal to the voltage of the first input power source AVDD1
  • the voltage of the first output terminal is equal to the voltage of the negative first input power source AVDD
  • the voltage of the second output terminal is equal to The voltage of the negative first input power source AVDD1 is subtracted from the voltage of the second input power source AVDD2.
  • the first input power source AVDD1 and the second input power source AVDD2 are equal, for example, equal to V, then in the second discharge state, the first The voltage at one output is equal to -V and the voltage at the second output is equal to -2V.
  • the voltage conversion device of the embodiment of the present application uses a small amount of capacitance to realize the floating of the power supply voltage.
  • the voltage conversion device can be better integrated into the circuit or packaged into the chip, and can be used to boost the supply voltage for the fingerprint chip and improve the whole.
  • the performance of the fingerprint chip reduces the dependence on peripheral devices and improves the reliability of the entire system.
  • the voltage conversion device 100 may further include three sets of switches, wherein the first group of switches is used to control the voltage conversion device 100 to be in a charging state, for example, when the first group of the three groups of switches are closed.
  • the second group of switches is used to control the voltage conversion device 100 to be in a first discharging state, for example, when the second group of the three switches is closed, the voltage is converted
  • the device 100 is in a first discharging state
  • the third group of switches is configured to control the voltage converting device 100 to be in a second discharging state, for example, when the third group of the three switches is closed, the voltage converting device 100 is in the first state Two discharge states.
  • the voltage conversion device 100 may specifically include eight switches, which are respectively referred to as first to eighth switches ⁇ 1 ⁇ ⁇ 8; that is, three sets of switches of the voltage conversion device 100 may be It is realized by the eight switches ⁇ 1 to ⁇ 8, thereby controlling the voltage conversion device 100 to switch between the state of charge, the first state of discharge, and the state of the second state of discharge.
  • a first end of the first capacitor C1 is respectively connected to one ends of the first switch ⁇ 1, the second switch ⁇ 2, and the third switch ⁇ 3 of the eight switches.
  • the other end of the first switch ⁇ 1 is connected to the first input power AVDD 1 of the first input terminal, and the other end of the second switch ⁇ 2 is grounded to GND; the second end of the first capacitor C1 and the first of the eight switches respectively
  • One end of the fourth switch ⁇ 4, the fifth switch ⁇ 5 and the sixth switch ⁇ 6 are connected, the other end of the fourth switch ⁇ 4 is connected to the third input power AVDD3 of the third input terminal, and the other end of the fifth switch ⁇ 5 is grounded to GND.
  • the first end of the second capacitor C2 is respectively connected to the other end of the sixth switch ⁇ 6, one end of the seventh switch ⁇ 7, and the first output end, and the other end of the seventh switch ⁇ 7 is connected to the second input power source AVDD2;
  • the second end of the capacitor C2 is respectively connected to the second output end, the other end of the third switch ⁇ 3, and one end of the eighth switch ⁇ 8 of the eight switches, and the other end of the eighth switch ⁇ 8 is grounded to GND.
  • the first switch ⁇ 1, the fifth switch ⁇ 5, the seventh switch ⁇ 7, and the eighth switch ⁇ 8 belong to the first group of switches, that is, when only the four switches are closed, the voltage conversion device 100 is charged.
  • the third switch ⁇ 3 and the fourth switch ⁇ 4 belong to the second group of switches, that is, only close the In the case of two switches, the voltage conversion device 100 is in a first discharge state
  • the second switch ⁇ 2 and the sixth switch ⁇ 6 belong to a third group of switches, that is, when only the two switches are closed, the voltage conversion device 100 is in a second discharge state.
  • the voltage conversion device 100 can control the state of each group of switches through a timing controller.
  • the voltage conversion device 100 may include a timing controller, when the timing controller outputs the first signal, the voltage conversion device 100 is in a first discharging state; when the timing controller outputs the second signal, the voltage conversion The device 100 is in the second discharging state; when the timing controller does not output a signal, or when the third signal is output, the voltage converting device 100 is in a charging state, and the embodiment of the present application is not limited thereto.
  • the voltage conversion device 100 can be used to convert a voltage, for example, can be used to provide an output voltage obtained after voltage conversion to a fingerprint chip as a supply voltage of the fingerprint chip.
  • FIG. 2 shows a schematic diagram of a fingerprint chip 200 in accordance with an embodiment of the present application.
  • the fingerprint chip 200 has a fingerprint input end and a fourth input end.
  • the fingerprint input end is used for inputting fingerprint information. For example, as shown in FIG. 2, when the user fingerprint is collected, the user's finger presses the fingerprint chip.
  • the fourth input terminal can be connected to the first output terminal of the voltage conversion device 100, that is, the voltage value of the fourth input terminal is equal to the voltage of the first output terminal of the voltage conversion device 100.
  • the fourth input terminal may be connected to the internal power source of the other fingerprint chip, and the embodiment of the present application is not limited thereto.
  • the fingerprint chip 200 further includes a ninth switch ⁇ 9, a tenth switch ⁇ 10, a sensor circuit, an integrating capacitor Cint, and an operational amplifier, wherein the sensor circuit may include a sensor array having a plurality of detecting electrodes, and the detecting electrode may be Pixel electrode.
  • the ninth switch ⁇ 9 and the tenth switch ⁇ 10 may also become the first sensor switch and the second sensor switch of the fingerprint chip 200, respectively.
  • the fingerprint detecting capacitor Cf is connected to the sensor circuit in the fingerprint chip 200, and the sensor circuit can be connected to the second output end of the voltage converting device 100, that is, the second output end of the voltage converting device 100 is connected to the reference of the sensor circuit.
  • the voltage value of the fingerprint chip 200 is made to use the voltage of the second output terminal as a reference voltage.
  • the sensor circuit is also connected to one ends of the ninth switch ⁇ 9 and the tenth switch ⁇ 10, respectively; the other end of the ninth switch ⁇ 9 and the fourth end of the fingerprint chip 200
  • the other end of the tenth switch ⁇ 10 is connected to one end of the integrating capacitor Cint and the inverting input terminal of the operational amplifier; the other end of the integrating capacitor Cint is connected to the output end of the operational amplifier; the same input terminal of the operational amplifier can be connected
  • a power supply device enables the same input terminal to receive the reference voltage Vcm.
  • the output voltage Vout of the output of the operational amplifier can be detected by the voltage detecting module.
  • the fingerprint chip 200 can include the voltage detecting module for detecting the output voltage Vout of the output of the operational amplifier.
  • a reset switch Reset may be connected to both ends of the integral capacitor Cint in the fingerprint chip 200.
  • the reset switch Reset is used to close the reset switch Reset when fingerprint detection is not required, and the fingerprint chip 200 does not work.
  • the switching of the switch states of the ninth switch ⁇ 9 and the tenth switch ⁇ 10 of the fingerprint chip 200 may be controlled by a timing controller, for example, the fingerprint chip 200 may include the timing controller, or the timing controller may also It is included in the voltage conversion device 100. Specifically, when the timing controller outputs a signal, the ninth switch ⁇ 9 is closed, the tenth switch ⁇ 10 is turned off, and when the timing controller outputs another signal, the tenth switch ⁇ 10 is closed, and the ninth switch is closed. ⁇ 9 is turned off; when the timing controller does not output a signal, the ninth switch ⁇ 9 and the tenth switch ⁇ 10 are both turned off.
  • the voltage values of the first input power source AVDD1, the second input power source AVDD2, and the third input power source AVDD3 are all equal, and the voltage values of the three input power sources are assumed. Is V. That is, in the first discharge state, the voltage at the first output terminal is equal to 3V, and the voltage at the second output terminal is equal to 2V; in the second discharge state, the voltage at the first output terminal is equal to -V, and the voltage at the second output terminal is equal to -2V.
  • the fingerprint chip 200 when the reset switch Reset is in an off state, the fingerprint chip 200 starts performing fingerprint scanning.
  • the on/off states of the ninth switch ⁇ 9 and the tenth switch ⁇ 10 and the three sets of switches may be controlled by a signal outputted by the timing controller; when the timing controller outputs a low level, the ninth switch ⁇ 9 is closed and the first The ten switch ⁇ 10 is disconnected, and the voltage conversion device 100 is in the first discharge state, while controlling the second group of switches in the voltage conversion device 100 to be closed, that is, the voltage at the first output end of the voltage conversion device 100 is equal to 3V, the second output The voltage at the terminal is equal to 2V.
  • the reference voltage of the sensor circuit of the fingerprint chip 200 is 2V
  • the fourth input end of the fingerprint chip 200 is connected to the first output end of the voltage conversion device 100, that is, the input voltage of the fourth input terminal is 3V
  • the total number of charges on Cf and Cint Q 3V*Cf+(Vcm-Vout1)*Cint
  • Cf represents the capacitance value of the fingerprint detection capacitor
  • Cint represents the capacitance value of the integration capacitor
  • Vcm represents the connection of the op amp Input power supply
  • the voltage of the device, Vout1 represents the current measured output voltage value of the voltage detection module connected to the output of the operational amplifier.
  • the ninth switch ⁇ 9 is turned off and the tenth switch ⁇ 10 is turned off, and the voltage conversion device 100 is in the second discharge state, that is, the voltage at the first output end of the voltage conversion device 100 at this time.
  • the voltage at the second output is equal to -2V.
  • the reference voltage of the sensor circuit of the fingerprint chip 200 is -2V
  • the input voltage of the fourth input terminal is -V
  • the total number of charges of the fingerprint detecting capacitor and the integrating capacitor is equal, and a timing control period can be obtained.
  • the difference of the output voltage of the fingerprint chip 200 (Vout2-Vout1) (Vcm-5V)*Cf /Cint, that is, the value of Cf can be reflected by the voltage measured by the voltage detection module, and the peaks and ridges of the fingerprint can be reflected by the difference in the value of Cf, thereby outputting the fingerprint shape.
  • the second group of switches in the voltage converting device 100 and the ninth of the fingerprint chip 200 are turned off.
  • the first group of switches in the voltage conversion device 100 can be closed first, so that the voltage conversion device 100 is in a charging state, the charging of the first capacitor C1 and the second capacitor C2 is completed, and then the first group of switches is opened and closed.
  • the third set of switches causes the voltage conversion device 100 to be in a first discharge state. Since the time during which the voltage conversion device 100 is in the charging state is short, this phase can be reduced or eliminated.
  • the conventional fingerprint chip is generally based on the ground GND.
  • the fingerprint chip 200 is based on the second output end of the voltage conversion device 100.
  • the difference (Vout2-Vout1) (Vcm - V) * Cf / Cint.
  • the embodiment of the present application can increase the voltage difference to the original (Vcm-5V) / (Vcm-V) times with respect to the conventional fingerprint chip that does not use the voltage conversion device 100 of the embodiment of the present application for voltage conversion.
  • Vcm can be 0.5V, and the signal amount is increased by 8 times.
  • the voltage conversion device of the embodiment of the present application uses a small amount of capacitance to realize the power supply voltage floating.
  • the voltage conversion device does not need to use an inductor as a boosting component, can be better integrated into the circuit or packaged into the chip, can be used to boost the supply voltage for the fingerprint chip, improve the performance of the entire fingerprint chip, and reduce the peripheral device. Dependence to improve the reliability of the entire system.
  • FIG. 3 illustrates the fingerprint detection system according to the embodiment of the present application. schematic diagram.
  • the fingerprint detecting system includes a voltage converting device and a fingerprint sensor.
  • the voltage converting device in the dotted line frame can correspond to the voltage converting device 100 of the embodiment of the present application, that is, the eight switches in the voltage converting device 100. It can be realized by a metal-oxide-semiconductor field effect transistor (MOS transistor), such as Q1-Q8 in FIG. 3, which are eight MOS transistors, which can place the device at Different states.
  • MOS transistor metal-oxide-semiconductor field effect transistor
  • the fingerprint sensor in the system of FIG. 3 may correspond to the fingerprint chip 200 of FIG.
  • the SAVDD end in the dotted line frame corresponds to the first output end of the voltage conversion device 100 in FIG.
  • the fingerprint sensor includes a sensor power supply end and a sensor ground end, and the sensor power supply end and the sensor ground end may be respectively connected to a first output end of the voltage conversion device 100 (ie, SAVDD of FIG. 3) and a second output. End (ie SGND of Figure 3).
  • the voltage conversion device needs to operate in the charging state, that is, the entire fingerprint detecting system operates in the S1 phase, and the first signal line S1 is controlled to output a high level, the second signal line S2 and the third signal line S3 through the timing controller.
  • the output low level at this time, the first MOS transistor Q1, the fourth MOS transistor Q4, the eighth MOS transistor Q8, and the sixth MOS transistor Q6 are turned on, the other MOS transistors are turned off, and the first capacitor C1 and the second capacitor C2 are charged and The charge is stored.
  • the sensor power supply terminal and the sensor ground terminal of the fingerprint sensor are connected to the power supply lines SAVDD and SGND respectively, and are directly connected to the main power supply lines AVDD and GND, that is, the output voltage of the SAVDD terminal is equal to the voltage value of AVDD, and the SGND terminal is grounded. GND, at this time, the fingerprint sensor can be powered by the SAVDD terminal and the SGND terminal.
  • the second signal line S2 is controlled to output a high level by the timing controller, the first signal line S1 and the third signal line S3.
  • the output is low, and the third MOS transistor Q3 is turned on. Since the charge of the first capacitor C1 cannot be abruptly changed, the level of the end of the first capacitor C1 and the source of the second MOS transistor Q2 is changed to 2AVDD.
  • the second MOS transistor Q2 is turned on automatically, and the other MOS transistors are turned off, so that the SGND level becomes 2AVDD, and the SAVDD level becomes 3AVDD, that is, the fingerprint sensor can be powered by the 2AVDD of the SAVDD terminal and the 3AVDD of the SGND terminal.
  • the third signal line S3 is controlled to output a high level through the timing controller, and the first signal line S1 and the second signal line S2 are output.
  • the output level is low, and the fifth MOS transistor Q5 is turned on.
  • the level of the end of the first capacitor C1 and the source of the seventh MOS transistor Q7 is changed to -AVDD.
  • the seventh MOS transistor Q7 is turned on automatically, and the other MOS transistors are turned off, so that the SAVDD level becomes -AVDD, and the SGND level becomes -2AVDD, that is, the fingerprint sensor can be powered by the -AVDD of the SAVDD terminal and the -2AVDD of the SGND terminal. .
  • the fingerprint detecting system of the embodiment of the present application includes a voltage converting device, and the power supply voltage floating can be realized by using a small amount of capacitance, and the voltage converting device can be better integrated into the circuit or packaged into the chip, in the fingerprint detecting system. It can be used to boost the supply voltage for the fingerprint sensor, improve the performance of the entire fingerprint detection system while reducing the dependence on peripheral devices and improve the reliability of the entire system.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present application which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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Abstract

一种电压转换装置和指纹检测系统。该装置包括三个输入端、两个电容和两个输出端，两个输出端分别位于其中一个电容的两端，在第一时刻，该装置处于充电状态，为两个电容充电；在该第一时刻之后的第二时刻，该装置处于第一放电状态，两个电容与输入端电源串联；在该第一时刻之后的第三时刻，该装置处于第二放电状态，两个电容串联且一端接地。上述电压转换装置利用少量电容实现供电电压浮地，能够较好地集成到电路里面或者封装到芯片中，可以用于为指纹芯片提升供电电压，提升整个指纹芯片性能的同时减小对外围器件的依赖，提升整个系统的可靠性。

Description

电压转换装置和指纹检测系统 技术领域
本申请涉及生物识别技术领域，尤其涉及一种电压转换装置和指纹检测系统。
背景技术
随着手机厂商对指纹模组放置在正面的需求和可靠性不断提升，指纹芯片需要支持越来越高的盖板厚度。部分手机厂商为了手机美观及防水考虑，要求指纹芯片能够支持隐式指纹(UnderGlass)。由于手机电池电压的限制，目前指纹芯片的供电电压普遍在2.8-3.3V。而该电压下使得电容式指纹芯片难以保证性能，有效地提升打码电压成为其性能的关键因素。
电容式指纹芯片一般使用电感式升压电路来实现电压提升，其特点在于通过电感和调制器件，利用电感的充放电过程，提升指纹芯片的电压上。但是，由于其使用电感作为升压器件，不能集成到集成电路中，同时电感由于尺寸的限制，不利于封装到芯片里面，并且如果利用较多的电容，将导致集成电路的尺寸加大。
发明内容
本申请提供了一种电压转换装置和指纹检测系统，能够实现供电电压浮地，提升现有指纹芯片的信号量，从而提升整个系统的可靠性。
第一方面，提供了一种电压转换装置，该电压转换装置包括：第一输入端、第二输入端、第三输入端、第一电容、第二电容、第一输出端和第二输出端，其中，该第一输入端连接第一输入电源，该第二输入端连接第二输入电源，该第三输入端连接第三输入电源，
在该电压转换装置处于充电状态时，该第一电容的第一端与该第一输入端相连，该第一电容的第二端接地，该第二电容的第一端分别与该第二输入端和该第一输出端相连，该第二电容的第二端分别与该第二输出端和地相连；
在该电压转换装置处于第一放电状态时，该第一电容的第二端与该第三输入端相连，该第一电容的第一端分别与该第二输出端和该第二电容的第二 端相连，该第二电容的第一端与该第一输出端相连；
在该电压转换装置处于第二放电状态时，该第一电容的第一端接地，该第一电容的第二端分别与该第一输出端和该第二电容的第一端相连，该第二电容的第二端与该第二输出端相连，该第三时刻在该第一时刻之后。
可选地，该电压转换装置可以在第一时刻处于充电时刻，在第二时刻处于第一放电状态，在第三时刻处于第二放电状态。其中，该第二时刻和第三时刻在第一时刻之后，该第三时刻可以在第二时刻之前，该第三时刻还可以在第二时刻之后。
因此，本申请实施例的电压转换装置，利用少量电容实现供电电压浮地，提升指纹信号量，同时使得该电压转换装置能够较好地集成到电路里面或者封装到芯片中减小对外围器件的依赖，提升整个系统的可靠性。
结合第一方面，在第一方面的一种实现方式中，该电压转换装置还包括第一组开关、第二组开关和第三组开关，用于控制所述电压转换装置在所述充电状态、第一放电状态和第二放电状态进行切换。
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，当仅闭合该第一组开关时，该电压转换装置处于该充电状态，当仅闭合该第二组开关时，该电压转换装置处于该第一放电状态。当仅闭合该第三组开关时，该电压转换装置处于该第二放电状态。
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述第一组开关、所述第二组开关和所述第三组开关通过八个开关来实现，所述八个开关包括第一开关、第二开关、第三开关、第四开关、第五开关、第六开关、第七开关和第八开关。
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，该第一电容的第一端分别与该八个开关中的第一开关、第二开关和第三开关的一端相连，该第一开关的另一端与该第一输入电源相连，该第二开关的另一端接地，所述第三开关的另一端连接到所述第二输出端，该第一电容的第二端分别与该八个开关中的第四开关、第五开关和第六开关的一端相连，该第四开关的另一端与该第三输入电源相连，该第五开关的另一端接地，所述第六开关的另一端连接到所述第一输出端，该第二电容的第一端分别与该八个开关中的第七开关的一端和第一输出端相连，该第七开关的另一端与该第二输入电源相连，该第二电容的第二端分别与第二输出端和该八个开关中的第 八开关的一端相连，该第八开关的另一端接地。
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，该第一组开关包括该第一开关、该第五开关、该第七开关和该第八开关，该第二组开关包括该第三开关和该第四开关，该第三组开关包括该第二开关和该第六开关。
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，该八个开关中的至少一个开关为金属-氧化物-半导体场效应晶体管。
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，该电压转换装置还包括时序控制器，所述时序控制器用于控制所述第一组开关、所述第二组开关和所述第三组开关的开关状态。
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，当该时序控制器输出第一信号时，该电压转换装置处于第一放电状态，当该时序控制器输出第二信号时，该电压转换装置处于第二放电状态。
因此，本申请实施例的电压转换装置，利用少量电容实现供电电压浮地，使得该电压转换装置能够较好地集成到电路里面或者封装到芯片中，可以用于为指纹芯片提升供电电压，提升整个指纹芯片性能的同时减小对外围器件的依赖，提升整个系统的可靠性。
第二方面，提供了一种指纹检测系统，该系统包括指纹传感器和第一方面以及第一方面的各个实现方式中的电压转换装置，其中所述电压转换装置连接到所述指纹传感器，用于为所述指纹传感器提供供电电压。
结合第二方面，在第二方面的一种实现方式中，所述指纹传感器包括传感器电源端和传感器地端，其中所述传感器供电端连接到所述电压转换装置的第一输出端，所述传感器地端连接到所述电压转换装置的第二输出端。
结合第二方面及其上述实现方式，在第二方面的另一种实现方式中，所述指纹传感器还包括传感器电路、运算放大器和积分电容，所述传感器电路用于采集指纹信息，且其连接到所述传感器地端，并通过第一传感器开关到连接到所述运算放大器的反相输入端，同时通过第二传感器开关连接到所述传感器供电端；所述运算放大器的同相输入端用于接收参考电压；所述积分电容连接在所述运算放大器的输出端和所述反相输入端之间。
结合第二方面及其上述实现方式，在第二方面的另一种实现方式中，该指纹检测系统还包括复位开关，所述复位开关连接在所述积分电容的两端。
结合第二方面及其上述实现方式，在第二方面的另一种实现方式中，当所述电压转换装置处于所述第一放电状态时，所述第一传感器开关闭合，而所述第二传感器开关断开；当所述电压转换装置处于所述第二放电状态时，所述第一传感器开关断开，而所述第二传感器开关闭合。
第三方面，提供了一种检测系统，该检测系统包括传感器和电压转换电路，所述电压转换电路连接到所述传感器，用于为所述传感器提供供电电压；所述电压转换电路包括第一电容和第二电容，其中，所述第二电容两端分别连接到所述电压转换电路的第一输出端和第二输出端；在充电完成之后，所述第一电容的两端具有第一输入电源的电压，而所述第二电容的两端具有第二输入电源的电压；所述第一电容用于在第一放电状态下接收第三输入电源的电压并将所述第二输出端的电压提升至所述第一输入电源和所述第三输入电源的电压和，并且在第二放电状态下将所述第一输出端的电压拉低至第一输入电源的负电压；所述第二电容在所述第一放电状态和所述第二放电状态下其两端维持所述第二输入电源的电压。
结合第三方面，在第三方面的一种实现方式中，所述传感器包括传感器电源端和传感器地端，其中所述传感器供电端连接到所述电压转换电路的第一输出端，所述传感器地端连接到所述电压转换电路的第二输出端。
结合第三方面及其上述实现方式，在第三方面的另一种实现方式中，所述传感器还包括传感器电路、运算放大器和积分电容，所述传感器电路用于采集指纹信息，且其连接到所述传感器地端，并通过第一传感器开关到连接到所述运算放大器的反相输入端，同时通过第二传感器开关连接到所述传感器供电端；所述运算放大器的同相输入端用于接收参考电压；所述积分电容连接在所述运算放大器的输出端和所述反相输入端之间。
结合第三方面及其上述实现方式，在第三方面的另一种实现方式中，当所述电压转换电路处于所述第一放电状态时，所述第一传感器开关闭合，而所述第二传感器开关断开；当所述电压转换电路处于所述第二放电状态时，所述第一传感器开关断开，而所述第二传感器开关闭合。
结合第三方面及其上述实现方式，在第三方面的另一种实现方式中，所述电压转换电路包括第一输入端、第二输入端和第三输入端，分别连接所述第一输入电源、所述第二输入电源和所述第三输入电源；在所述电压转换电路处于充电状态时，所述第一电容的第一端与所述第一输入端相连，所述第 一电容的第二端接地；所述第二电容的第一端分别与所述第二输入端和所述第一输出端相连，所述第二电容的第二端分别与所述第二输出端和地相连；在所述电压转换电路处于第一放电状态时，所述第一电容的第二端与所述第三输入端相连，所述第一电容的第一端分别与所述第二输出端和所述第二电容的第二端相连，所述第二电容的第一端与所述第一输出端相连；在所述电压转换电路处于第二放电状态时，所述第一电容的第一端接地，所述第一电容的第二端分别与所述第一输出端和所述第二电容的第一端相连，所述第二电容的第二端与所述第二输出端相连。
结合第三方面及其上述实现方式，在第三方面的另一种实现方式中，所述电压转换电路还包括第一组开关、第二组开关和第三组开关，用于控制所述电压转换电路在所述充电状态、第一放电状态和第二放电状态进行切换。
结合第三方面及其上述实现方式，在第三方面的另一种实现方式中，当仅闭合所述第一组开关时，所述电压转换电路处于所述充电状态；当仅闭合所述第二组开关时，所述电压转换电路处于所述第一放电状态；当仅闭合所述第三组开关时，所述电压转换电路处于所述第二放电状态。
结合第三方面及其上述实现方式，在第三方面的另一种实现方式中，所述第一组开关、所述第二组开关和所述第三组开关通过八个开关来实现，所述八个开关包括第一开关、第二开关、第三开关、第四开关、第五开关、第六开关、第七开关和第八开关。
结合第三方面及其上述实现方式，在第三方面的另一种实现方式中，所述第一电容的第一端分别与所述第一开关、所述第二开关和所述第三开关的一端相连，所述第一开关的另一端与所述第一输入电源相连，所述第二开关的另一端接地，所述第三开关的另一端连接到所述第二输出端；所述第一电容的第二端分别与所述第四开关、所述第五开关和所述第六开关的一端相连，所述第四开关的另一端与所述第三输入电源相连，所述第五开关的另一端接地，所述第六开关的另一端连接到所述第一输出端；所述第二电容的第一端分别与所述第七开关的一端和所述第一输出端相连，所述第七开关的另一端与所述第二输入电源相连；所述第二电容的第二端分别与所述第二输出端和所述第八开关的一端相连，所述第八开关的另一端接地。
结合第三方面及其上述实现方式，在第三方面的另一种实现方式中，所述第一组开关包括所述第一开关、所述第五开关、所述第七开关和所述第八 开关；所述第二组开关包括所述第三开关和所述第四开关；所述第三组开关包括所述第二开关和所述第六开关。
结合第三方面及其上述实现方式，在第三方面的另一种实现方式中，所述电压转换电路还包括时序控制器，所述时序控制器用于控制所述第一组开关、所述第二组开关和所述第三组开关的开关状态；其中，当所述时序控制器输出第一信号时，所述电压转换电路处于第一放电状态，当所述时序控制器输出第二信号时，所述电压转换电路处于第二放电状态。
附图说明
图1是根据本申请实施例的电压转换装置的示意图。
图2是根据本申请实施例的指纹芯片的示意图。
图3是根据本申请实施例的指纹检测系统的示意图。
具体实施方式
下面将结合附图，对本申请实施例中的技术方案进行描述。
图1示出了根据本申请实施例的电压转换装置100的示意图。具体地，该电压转换装置100可以包括：三个输入端、两个电容和两个输出端，其中，三个输入端分别为第一输入端、第二输入端和第三输入端，该三个输入端分别连接一个输入电源，例如，如图1所示，第一输入端连接第一输入电源，即模拟电源AVDD 1，第二输入端连接第二输入电源AVDD 2，第三输入端连接第三输入电源AVDD 3，该三个输入电源的电压值可以相等；两个电容分别为如图1所示的第一电容C1和第二电容C2；两个输出端分别为如图1所示的第一输出端和第二输出端。
在第一时刻，该电压转换装置100处于充电状态，即为第一电容C1和第二电容C2充电。具体地，该第一电容C1的第一端与第一输入端的第一输入电源AVDD1相连，该第一电容C1的第二端接地GND；第二电容C2的第一端分别与第二输入端的第二输入电源AVDD2和第一输出端相连，第二电容C2的第二端分别与第二输出端和地GND相连。
在该充电状态，第一电容C1充电后，第一端与第二端具有电压差，该电压差等于第一输入电源AVDD1的电压；第二电容充电后，该第二电容C2的第一端和第二端具有电压差，该电压差等于第二输入电源AVDD2的电压； 第二输出端接地GND，则输出电压为零，第一输出端输出电压为第二输入电源AVDD2的电压。
在第二时刻，该电压转换装置100处于第一放电状态，具体地，该第二时刻发生在第一时刻之后，即在第一电容C1和第二电容C2完成充电之后。在该第一放电状态，该第一电容C1的第二端与第三输入端的第三输入电源AVDD3相连，该第一电容C1的第一端分别与第二输出端和第二电容C2的第二端相连，该第二电容C2的第一端与第一输出端相连。
在该第一放电状态，由于第一电容C1和第二电容C2经过充电过程之后两端具有电压差，则第二输出端的电压值等于第三输入端的第三输入电源AVDD3的电压值与第一电容C1具有的电压差之和，而第一电容两端的电压差等于第一输入电源AVDD1的电压，因此第二输出端的电压值等于第三输入电源AVDD3的电压值与第一输入电源AVDD1的电压值之和。对应地，第一输出端的电压值等于第一输入电源AVDD1的电压、第二输入电源AVDD2的电压和第三输入电源AVDD3的电压之和。当第一输入电源AVDD1、第二输入电源AVDD2和第三输入电源AVDD3的电压值相等时，例如均等于V，则在第一放电状态，第一输出端的电压等于3V，第二输出端的电压等于2V。
在第三时刻，该电压转换装置100处于第二放电状态，具体的，该第三时刻发生在第一时刻之后，即在第一电容C1和第二电容C2完成充电之后。在该第二放电状态，第一电容C1的第一端接地GND，第一电容C1的第二端分别与第一输出端和第二电容C2的第一端相连，该第二电容C2的第二端与第二输出端相连。
可选地，该第三时刻可以在第二时刻之后，也可以在该第二时刻之前，本申请实施例并不限于此。
在该第二放电状态，由于第一电容C1和第二电容C2经过充电过程之后两端具有电压差，并且第一电容C1的第一端接地GND，则第一输出端的电压等于负的第一电容C1的电压，而第一电容C1两端的电压差等于第一输入电源AVDD1的电压，因此，第一输出端的电压等于负的第一输入电源AVDD的电压；对应地，第二输出端的电压等于负的第一输入电源AVDD1的电压减去第二输入电源AVDD2的电压。当第一输入电源AVDD1和第二输入电源AVDD2的电压值相等时，例如均等于V，则在第二放电状态，第 一输出端的电压等于-V，第二输出端的电压等于-2V。
因此，本申请实施例的电压转换装置，利用少量电容实现供电电压浮地，该电压转换装置能够较好地集成到电路里面或者封装到芯片中，可以用于为指纹芯片提升供电电压，提升整个指纹芯片性能的同时减小对外围器件的依赖，提升整个系统的可靠性。
作为一种实施例，该电压转换装置100还可以包括三组开关，其中，第一组开关用于控制该电压转换装置100处于充电状态，比如，当该三组开关中的第一组开关闭合时，使得该电压转换装置100处于充电状态；第二组开关用于控制该电压转换装置100处于第一放电状态，比如，当该三组开关中的第二组开关闭合时，使得该电压转换装置100处于第一放电状态；第三组开关用于控制该电压转换装置100处于第二放电状态，比如，当该三组开关中的第三组开关闭合时，使得该电压转换装置100处于第二放电状态。
在本申请实施例中，如图1所示，该电压转换装置100可以具体包括八个开关，以下分别记为第一至第八开关Ф1～Ф8；即该电压转换装置100的三组开关可以通过该八个开关Ф1～Ф8实现，从而控制该电压转换装置100在充电状态、第一放电状态和第二放电状态之间进行转换。
具体地，如图1所示，在该电压转换装置100中，第一电容C1的第一端分别与该八个开关中的第一开关Ф1、第二开关Ф2和第三开关Ф3的一端相连，该第一开关Ф1的另一端与第一输入端的第一输入电源AVDD 1相连，该第二开关Ф2的另一端接地GND；第一电容C1的第二端分别与该八个开关中的第四开关Ф4、第五开关Ф5和第六开关Ф6的一端相连，该第四开关Ф4的另一端与第三输入端的第三输入电源AVDD3相连，该第五开关Ф5的另一端接地GND。
第二电容C2的第一端分别与第六开关Ф6的另一端、第七开关Ф7的一端和第一输出端相连，第七开关Ф7的另一端与该第二输入电源AVDD2相相连；第二电容C2的第二端分别与第二输出端、第三开关Ф3的另一端和该八个开关中的第八开关Ф8的一端相连，该第八开关Ф8的另一端接地GND。
应理解，如图1所示，第一开关Ф1、第五开关Ф5、第七开关Ф7和第八开关Ф8属于第一组开关，即仅该四个开关闭合时，该电压转换装置100处于充电状态；第三开关Ф3和第四开关Ф4属于第二组开关，即仅闭合该 两个开关时，该电压转换装置100处于第一放电状态；第二开关Ф2和第六开关Ф6属于第三组开关，即仅闭合该两个开关时，该电压转换装置100处于第二放电状态。
可选地，该电压转换装置100可以通过时序控制器控制各组开关的状态。具体地，该电压转换装置100可以包括时序控制器，当该时序控制器输出第一信号时，该电压转换装置100处于第一放电状态；当该时序控制器输出第二信号时，该电压转换装置100处于第二放电状态；当该时序控制器不输出信号时，或者输出第三信号时，该电压转换装置100处于充电状态，本申请实施例并不限于此。
在本申请实施例中，该电压转换装置100可以用于转换电压，例如，可以用于将电压转换之后得到的输出电压提供给指纹芯片来作为指纹芯片的供电电压。具体的，图2示出了根据本申请实施例的指纹芯片200的示意图。如图2所示，该指纹芯片200具有指纹输入端与第四输入端，该指纹输入端用于录入指纹信息，例如图2所示，在采集用户指纹时，该用户的手指按压该指纹芯片以使得手指与该指纹输入端相耦合；该第四输入端可以与电压转换装置100中的第一输出端相连，即该第四输入端的电压值等于电压转换装置100中的第一输出端的电压，或者，该第四输入端还可以与其它指纹芯片的内部电源相连，本申请实施例并不限于此。
具体地，该指纹芯片200还包括第九开关Ф9、第十开关Ф10、传感器电路、积分电容Cint和运算放大器，其中，该传感器电路可以包括具有多个检测电极的传感器阵列，该检测电极可以为像素(Pixel)电极。所述第九开关Ф9和所述第十开关Ф10也可以分别成为所述指纹芯片200的第一传感器开关和第二传感器开关。在进行指纹识别时，例如2所示，该用户将手指耦合到该指纹芯片200的指纹输入端，传感器电路可以采集并处理该用户的指纹，可以将手指与传感器电路中的检测电极之间等效成指纹检测电容Cf，通过检测该指纹检测电容Cf的电容，进而获得用户指纹信息。
具体地，指纹检测电容Cf与指纹芯片200中传感器电路相连，该传感器电路可以与电压转换装置100中的第二输出端相连，即电压转换装置100中的第二输出端连接该传感器电路的参考地，使得该指纹芯片200的电压值以第二输出端的电压作为参考电压。该传感器电路还分别与第九开关Ф9和第十开关Ф10的一端相连；第九开关Ф9的另一端与该指纹芯片200的第四 输入端相连；第十开关Ф10的另一端分别与积分电容Cint的一端、运算放大器的反向输入端相连；积分电容Cint的另一端连接运算放大器的输出端；运算放大器的同向输入端可以连接一个供电装置，使得该同向输入端可以接收到参考电压Vcm。另外，该运算放大器的输出端输出电压Vout，可以通过电压检测模块进行检测；可选地，该指纹芯片200可以包括该电压检测模块，用于检测运算放大器的输出端输出电压Vout。
可选地，该指纹芯片200中的积分电容Cint的两端还可以连接复位开关Reset，该复位开关Reset用于在不需要进行指纹检测时，闭合该复位开关Reset，该指纹芯片200不工作。
可选地，可以通过时序控制器控制该指纹芯片200的第九开关Ф9和第十开关Ф10的开关状态的切换，例如，该指纹芯片200可以包括该时序控制器，或该时序控制器也可以包含在该电压转换装置100中。具体地，当该时序控制器输出一种信号时，该第九开关Ф9闭合，第十开关Ф10断开，当该时序控制器输出另一种信号时，该第十开关Ф10闭合，第九开关Ф9断开；当该时序控制器不输出信号时，第九开关Ф9和第十开关Ф10均断开。
在本申请实施例中，为了方便描述，下面以第一输入电源AVDD1、第二输入电源AVDD2以及第三输入电源AVDD3的电压值均相等为例进行说明，并假设三个输入电源的电压值均为V。即在第一放电状态，第一输出端的电压等于3V，第二输出端的电压等于2V；在第二放电状态，第一输出端的电压等于-V，第二输出端的电压等于-2V。
在本申请实施例中，如图2所示，当复位开关Reset处于断开状态时，该指纹芯片200开始执行指纹扫描。具体地，可以通过时序控制器的输出的信号来控制第九开关Ф9和第十开关Ф10以及上述三组开关的通断状态；当时序控制器输出低电平时，控制第九开关Ф9闭合以及第十开关Ф10断开，且电压转换装置100处于第一放电状态，同时控制电压转换装置100中的第二组开关闭合，即此时电压转换装置100的第一输出端的电压等于3V，第二输出端的电压等于2V。相对应地，指纹芯片200的传感器电路的参考电压为2V，且以指纹芯片200的第四输入端与电压转换装置100中的第一输出端相连为例，即该第四输入端的输入电压为3V，则Cf和Cint上的电荷总数Q＝3V*Cf+(Vcm-Vout1)*Cint，其中，Cf表示指纹检测电容的电容值，Cint表示积分电容的电容值，Vcm表示连接该运算放大器同向输入端的供电 装置的电压，Vout1表示连接运算放大器输出端的电压检测模块当前测量的输出电压值。
类似的，当时序控制器输出高电平时，控制第九开关Ф9断开以及第十开关Ф10闭合，且电压转换装置100处于第二放电状态，即此时电压转换装置100的第一输出端的电压等于-V，第二输出端的电压等于-2V。相对应地，指纹芯片200的传感器电路的参考电压为-2V，第四输入端的输入电压为-V，则Cf和Cint上的电荷总数Q＝(Vcm-2V)*Cf+(Vcm-Vout2)*Cint，其中，Vout2表示连接运算放大器输出端的电压检测模块在当前测量的输出电压值。
对于时序控制器输出的不同电平，指纹检测电容和积分电容的电荷总数相等，则可以得到一个时序控制周期该指纹芯片200输出电压的差值(Vout2-Vout1)＝(Vcm-5V)*Cf/Cint，即Cf的值可以通过电压检测模块测量的电压反应出来，而指纹的峰和脊可以通过Cf的值的差异体现，从而输出指纹形态。
可选地，在时序控制器从输出低电平向输出高电平转换后，即时序控制器输出高电平时，在断开电压转换装置100中的第二组开关以及指纹芯片200的第九开关Ф9后，可以先闭合电压转换装置100中的第一组开关，使得该电压转换装置100处于充电状态，完成第一电容C1和第二电容C2的充电，再断开第一组开关并闭合第三组开关，使得该电压转换装置100处于第一放电状态。由于该电压转换装置100处于充电状态的时间较短，因此可以减小或去除该阶段。
传统的指纹芯片一般以地端GND为基准，而本申请实施例中，指纹芯片200以电压转换装置100的第二输出端为基准。具体地，传统的指纹芯片的传感器电路接地GND，假设输入电源的电压为V，则通过时序控制器控制指纹芯片处于第一检测状态时，Cf和Cint上的电荷总数Q＝V*Cf+(Vcm-Vout1)*Cint；通过时序控制器控制指纹芯片处于第二检测状态时，Cf和Cint上的电荷总数Q＝Vcm*Cf+(Vcm-Vout2)*Cint，则可以得到传统的指纹芯片输出电压的差值(Vout2-Vout1)＝(Vcm-V)*Cf/Cint。
因此，相对于不使用本申请实施例的电压转换装置100进行电压转换的传统的指纹芯片，本申请实施例可以使得电压差值增大为原来的(Vcm-5V)/(Vcm-V)倍，一般情况下，Vcm可以为0.5V，则信号量增大了8倍。
因此，本申请实施例的电压转换的装置，利用少量电容实现供电电压浮 地，该电压转换装置无需采用电感作为升压元件，能够较好地集成到电路里面或者封装到芯片中，可以用于为指纹芯片提升供电电压，提升整个指纹芯片性能的同时减小对外围器件的依赖，提升整个系统的可靠性。
在本申请实施例中，该电压转换装置可以较好地集成到电路里面或者封装到芯片中，即可以集成到指纹芯片中，因此，图3示出了根据本申请实施例的指纹检测系统的示意图。
如图3所示，该指纹检测系统包括电压转换装置和指纹传感器，其中，虚线框内的电压转换装置可以对应本申请实施例的电压转换装置100，即电压转换装置100中的八个开关，可以通过金属(metal)—氧化物(oxide)—半导体(semiconductor)场效应晶体管(MOS管)实现，如图3中的Q1-Q8为八个MOS管，该八个MOS管可以使该装置处于不同状态。图3系统中的指纹传感器可对应图2中的指纹芯片200。在图3中，虚线框内的SAVDD端对应图1中电压转换装置100的第一输出端，虚线框内的SGND端对应图1中电压转换装置100的第二输出端。所述指纹传感器包括传感器供电端和传感器地端，所述传感器供电端和所述传感器地端可以分别连接到所述电压转换装置100的第一输出端(即图3的SAVDD)和第二输出端(即图3的SGND)。
具体地，当电压转换装置需要工作在充电状态时，即令整个指纹检测系统工作在S1阶段，通过时序控制器控制第一信号线S1输出高电平，第二信号线S2和第三信号线S3输出低电平，此时第一MOS管Q1、第四MOS管Q4、第八MOS管Q8、第六MOS管Q6导通，其他MOS管截止，第一电容C1和第二电容C2电容充电并存储电荷，指纹传感器的传感器电源端和传感器地端所连接到供电电源线SAVDD、SGND分别与主控的供电电源线AVDD、GND直接相连，即SAVDD端输出电压等于AVDD的电压值，SGND端接地GND，此时指纹传感器可以通过SAVDD端和SGND端供电。
当电压转换装置需要工作在第一放电状态时，即令整个指纹检测系统工作在S2阶段时，通过时序控制器控制第二信号线S2输出高电平，第一信号线S1和第三信号线S3输出低电平，此时第三MOS管Q3导通，由于第一电容C1的电荷不能突变，将导致第一电容C1与第二MOS管Q2的源级连接的一端电平变为2AVDD，第二MOS管Q2自动导通，其他MOS管处于关闭状态，使SGND电平变为2AVDD，SAVDD电平变为3AVDD，即此时指纹传感器可以通过SAVDD端的2AVDD和SGND端的3AVDD供电。
当电压转换装置需要工作在第二放电状态时，即令整个指纹检测系统工作在S3阶段时，通过时序控制器控制第三信号线S3输出高电平，第一信号线S1和第二信号线S2输出低电平，此时第五MOS管Q5导通，由于第一电容C1的电荷不能突变，将导致第一电容C1与第七MOS管Q7的源级连接的一端电平变为-AVDD，第七MOS管Q7自动导通，其他MOS管处于关闭状态，使SAVDD电平变为-AVDD，SGND电平变为-2AVDD，即此时指纹传感器可以通过SAVDD端的-AVDD和SGND端的-2AVDD供电。
因此，本申请实施例的指纹检测系统，包括电压转换装置，可以利用少量电容实现供电电压浮地，该电压转换装置能够较好地集成到电路里面或者封装到芯片中，在该指纹检测系统中，可以用于为指纹传感器提升供电电压，提升整个指纹检测系统性能的同时减小对外围器件的依赖，提升整个系统的可靠性。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (25)

  1. 一种电压转换装置，其特征在于，包括：第一输入端、第二输入端、第三输入端、第一电容、第二电容、第一输出端和第二输出端，其中，所述第一输入端连接第一输入电源，所述第二输入端连接第二输入电源，所述第三输入端连接第三输入电源，
    其中，在所述电压转换装置处于充电状态时，所述第一电容的第一端与所述第一输入端相连，所述第一电容的第二端接地；所述第二电容的第一端分别与所述第二输入端和所述第一输出端相连，所述第二电容的第二端分别与所述第二输出端和地相连；
    在所述电压转换装置处于第一放电状态时，所述第一电容的第二端与所述第三输入端相连，所述第一电容的第一端分别与所述第二输出端和所述第二电容的第二端相连，所述第二电容的第一端与所述第一输出端相连；
    在所述电压转换装置处于第二放电状态时，所述第一电容的第一端接地，所述第一电容的第二端分别与所述第一输出端和所述第二电容的第一端相连，所述第二电容的第二端与所述第二输出端相连。
  2. 根据权利要求1所述的电压转换装置，其特征在于，还包括第一组开关、第二组开关和第三组开关，用于控制所述电压转换装置在所述充电状态、第一放电状态和第二放电状态进行切换。
  3. 根据权利要求2所述的电压转换装置，其特征在于，当仅闭合所述第一组开关时，所述电压转换装置处于所述充电状态，
    当仅闭合所述第二组开关时，所述电压转换装置处于所述第一放电状态。
    当仅闭合所述第三组开关时，所述电压转换装置处于所述第二放电状态。
  4. 根据权利要求2或3所述的电压转换装置，其特征在于，所述第一组开关、所述第二组开关和所述第三组开关通过八个开关来实现，所述八个开关包括第一开关、第二开关、第三开关、第四开关、第五开关、第六开关、第七开关和第八开关。
  5. 根据权利要4所述的电压转换装置，其特征在于，所述第一电容的第一端分别与所述第一开关、所述第二开关和所述第三开关的一端相连，所述第一开关的另一端与所述第一输入电源相连，所述第二开关的另一端接 地，所述第三开关的另一端连接到所述第二输出端；
    所述第一电容的第二端分别与所述第四开关、所述第五开关和所述第六开关的一端相连，所述第四开关的另一端与所述第三输入电源相连，所述第五开关的另一端接地，所述第六开关的另一端连接到所述第一输出端；
    所述第二电容的第一端分别与所述第七开关的一端和所述第一输出端相连，所述第七开关的另一端与所述第二输入电源相连；
    所述第二电容的第二端分别与所述第二输出端和所述第八开关的一端相连，所述第八开关的另一端接地。
  6. 根据权利要5所述的电压转换装置，其特征在于，所述第一组开关包括所述第一开关、所述第五开关、所述第七开关和所述第八开关；所述第二组开关包括所述第三开关和所述第四开关；所述第三组开关包括所述第二开关和所述第六开关。
  7. 根据权利要求4-6中任一项所述的电压转换装置，其特征在于，所述八个开关中的至少一个开关为金属-氧化物-半导体场效应晶体管。
  8. 根据权利要求2-7中任一项所述的电压转换装置，其特征在于，所述电压转换装置还包括时序控制器，所述时序控制器用于控制所述第一组开关、所述第二组开关和所述第三组开关的开关状态。
  9. 根据权利要求8所述的电压转换装置，其特征在于，当所述时序控制器输出第一信号时，所述电压转换装置处于第一放电状态，
    当所述时序控制器输出第二信号时，所述电压转换装置处于第二放电状态。
  10. 一种指纹检测系统，其特征在于，包括指纹传感器和如权利要求1至9中任一项所述的电压转换装置，其中所述电压转换装置连接到所述指纹传感器，用于为所述指纹传感器提供供电电压。
  11. 根据权利要求10所述的指纹检测系统，其特征在于，所述指纹传感器包括传感器电源端和传感器地端，其中所述传感器供电端连接到所述电压转换装置的第一输出端，所述传感器地端连接到所述电压转换装置的第二输出端。
  12. 根据权利要求11所述的指纹检测系统，其特征在于，所述指纹传感器还包括传感器电路、运算放大器和积分电容，所述传感器电路用于采集指纹信息，且其连接到所述传感器地端，并通过第一传感器开关到连接到所述 运算放大器的反相输入端，同时通过第二传感器开关连接到所述传感器供电端；所述运算放大器的同相输入端用于接收参考电压；所述积分电容连接在所述运算放大器的输出端和所述反相输入端之间。
  13. 根据权利要求12所述的指纹检测系统，其特征在于，还包括复位开关，所述复位开关连接在所述积分电容的两端。
  14. 根据权利要求12所述的指纹检测系统，其特征在于，当所述电压转换装置处于所述第一放电状态时，所述第一传感器开关闭合，而所述第二传感器开关断开；当所述电压转换装置处于所述第二放电状态时，所述第一传感器开关断开，而所述第二传感器开关闭合。
  15. 一种检测系统，其特征在于，包括传感器和电压转换电路，所述电压转换电路连接到所述传感器，用于为所述传感器提供供电电压；所述电压转换电路包括第一电容和第二电容，其中，所述第二电容两端分别连接到所述电压转换电路的第一输出端和第二输出端；
    在充电完成之后，所述第一电容的两端具有第一输入电源的电压，而所述第二电容的两端具有第二输入电源的电压；
    所述第一电容用于在第一放电状态下接收第三输入电源的电压并将所述第二输出端的电压提升至所述第一输入电源和所述第三输入电源的电压和，并且在第二放电状态下将所述第一输出端的电压拉低至第一输入电源的负电压；所述第二电容在所述第一放电状态和所述第二放电状态下其两端维持所述第二输入电源的电压。
  16. 根据权利要求15所述的检测系统，其特征在于，所述传感器包括传感器电源端和传感器地端，其中所述传感器供电端连接到所述电压转换电路的第一输出端，所述传感器地端连接到所述电压转换电路的第二输出端。
  17. 根据权利要求16所述的检测系统，其特征在于，所述传感器还包括传感器电路、运算放大器和积分电容，所述传感器电路用于采集指纹信息，且其连接到所述传感器地端，并通过第一传感器开关到连接到所述运算放大器的反相输入端，同时通过第二传感器开关连接到所述传感器供电端；所述运算放大器的同相输入端用于接收参考电压；所述积分电容连接在所述运算放大器的输出端和所述反相输入端之间。
  18. 根据权利要求15至17中任一项所述的检测系统，其特征在于，当所述电压转换电路处于所述第一放电状态时，所述第一传感器开关闭合，而 所述第二传感器开关断开；当所述电压转换电路处于所述第二放电状态时，所述第一传感器开关断开，而所述第二传感器开关闭合。
  19. 根据权利要求15所述的检测系统，其特征在于，所述电压转换电路包括第一输入端、第二输入端和第三输入端，分别连接所述第一输入电源、所述第二输入电源和所述第三输入电源；
    在所述电压转换电路处于充电状态时，所述第一电容的第一端与所述第一输入端相连，所述第一电容的第二端接地；所述第二电容的第一端分别与所述第二输入端和所述第一输出端相连，所述第二电容的第二端分别与所述第二输出端和地相连；
    在所述电压转换电路处于第一放电状态时，所述第一电容的第二端与所述第三输入端相连，所述第一电容的第一端分别与所述第二输出端和所述第二电容的第二端相连，所述第二电容的第一端与所述第一输出端相连；
    在所述电压转换电路处于第二放电状态时，所述第一电容的第一端接地，所述第一电容的第二端分别与所述第一输出端和所述第二电容的第一端相连，所述第二电容的第二端与所述第二输出端相连。
  20. 根据权利要求19所述的检测系统，其特征在于，所述电压转换电路还包括第一组开关、第二组开关和第三组开关，用于控制所述电压转换电路在所述充电状态、第一放电状态和第二放电状态进行切换。
  21. 根据权利要求20所述的检测系统，其特征在于，当仅闭合所述第一组开关时，所述电压转换电路处于所述充电状态；当仅闭合所述第二组开关时，所述电压转换电路处于所述第一放电状态；当仅闭合所述第三组开关时，所述电压转换电路处于所述第二放电状态。
  22. 根据权利要求20或21所述的检测系统，其特征在于，所述第一组开关、所述第二组开关和所述第三组开关通过八个开关来实现，所述八个开关包括第一开关、第二开关、第三开关、第四开关、第五开关、第六开关、第七开关和第八开关。
  23. 根据权利要22所述的检测系统，其特征在于，所述第一电容的第一端分别与所述第一开关、所述第二开关和所述第三开关的一端相连，所述第一开关的另一端与所述第一输入电源相连，所述第二开关的另一端接地，所述第三开关的另一端连接到所述第二输出端；
    所述第一电容的第二端分别与所述第四开关、所述第五开关和所述第六 开关的一端相连，所述第四开关的另一端与所述第三输入电源相连，所述第五开关的另一端接地，所述第六开关的另一端连接到所述第一输出端；
    所述第二电容的第一端分别与所述第七开关的一端和所述第一输出端相连，所述第七开关的另一端与所述第二输入电源相连；
    所述第二电容的第二端分别与所述第二输出端和所述第八开关的一端相连，所述第八开关的另一端接地。
  24. 根据权利要23所述的检测系统，其特征在于，所述第一组开关包括所述第一开关、所述第五开关、所述第七开关和所述第八开关；所述第二组开关包括所述第三开关和所述第四开关；所述第三组开关包括所述第二开关和所述第六开关。
  25. 根据权利要求20-24中任一项所述的检测系统，其特征在于，所述电压转换电路还包括时序控制器，所述时序控制器用于控制所述第一组开关、所述第二组开关和所述第三组开关的开关状态；其中，当所述时序控制器输出第一信号时，所述电压转换电路处于第一放电状态，当所述时序控制器输出第二信号时，所述电压转换电路处于第二放电状态。
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