阅读说明：本技术 一种适用于大电容的快速升压电荷泵系统 (A kind of rapid pressure charge pump system suitable for bulky capacitor ) 是由 宇跃峰 尹勇生 孟煦 陈昕宇 贾晨 权磊 于 2019-08-30 设计创作，主要内容包括：本发明公开了一种适用于大电容的快速升压电荷泵系统,包括：控制电路、升压电荷泵和反馈电路；控制电路接受外部信号后产生传递给升压电荷泵的控制信号；升压电荷泵接收到制信号周期性地对飞线电容和输出电容以及存储电容进行充放电并产生输出电压给反馈电路；反馈电路根据接收到输出电压后与所设定的电压值进行比较,通过比较结果产生反馈信号控制电荷泵系统的工作。当电荷泵使用较大的电容时,由于产生稳定电压过程中电容端的压差逐渐减小,产生稳定输出电压的时间会很缓慢。本发明能解决采用大电容电荷泵的电压建立时间较长的问题,从而能实现快速升压功能。(The invention discloses a kind of rapid pressure charge pump systems suitable for bulky capacitor, comprising: control circuit, boosting charge pump and feed circuit；Control circuit generates the control signal for passing to boosting charge pump after receiving external signal；Boosting charge pump carries out charge and discharge to fly line capacitor and output capacitance and storage capacitance with receiving signal period property processed and generates output voltage to feed circuit；Feed circuit is compared after output voltage according to receiving with set voltage value, and the work of feedback signal control charge pump system is generated by comparing result.When charge pump uses biggish capacitor, since the pressure difference of capacitance terminal during generation burning voltage is gradually reduced, generating the time stabilized the output voltage can very slowly.The present invention can solve the Voltage Establishment time longer problem using bulky capacitor charge pump, to be able to achieve rapid pressure function.)

1. a kind of rapid pressure charge pump system suitable for bulky capacitor, feature includes: control circuit, boosting charge pump and anti- Current feed circuit；

The control circuit generates high-level control signal CTL_H or low level control after receiving external signal in current period Signal CTL_L simultaneously passes to boosting charge pump；

If the charge pump receives high-level control signal CTL_H, the power supply in the boosting charge pump is to fly line capacitor Cfly and storage capacitance Cstore charge；

If the charge pump receives low level control signal CTL_L, the fly line capacitor Cfly in the boosting charge pump and Storage capacitance Cstore charges to output capacitance Cout and generates output voltage VO UT to feed circuit；

The feed circuit is compared after receiving the output voltage VO UT with set voltage value VREF:

If output voltage VO UT is higher than the voltage value VREF, feed circuit generates feedback signal FB_OFF and passes to control Circuit makes control circuit stop generating high-level control signal CTL_H or low level control signal CTL_L in next period, from And boosting charge pump is made to stop working；

If output voltage VO UT is not higher than the voltage value VREF, feed circuit does not generate signal, and the control module is under One period continued to generate high-level control signal CTL_H or low level control signal CTL_L under the action of the external signal, So that the boosting charge pump works normally.

2. rapid pressure charge pump system according to claim 1, which is characterized in that the boosting charge pump is by flying Line capacitance Cfly, storage capacitance Cstore, output capacitance Cout and n switch composition；

When the charge pump receives high-level control signal CTL_H, by the connection of switch so that the fly line capacitor Cfly and storage capacitance Cstore is arranged in parallel between external power supply and ground line and forms access；The output capacitance Cout By forming open circuit between the connection and the fly line capacitor Cfly of switch；

When the charge pump receives low level control signal CTL_L, by the connection of switch so that the fly line capacitor Cfly, storage capacitance Cstore and output capacitance Cout are between external power supply and ground line and form access, and the storage Capacitor Cstore is connected between fly line capacitor Cfly and output capacitance Cout, one end ground connection of the output capacitance Cout, separately One end is connected with fly line capacitor Cfly.

Technical field

The present invention relates to semiconductor integrated circuit technology more particularly to a kind of charge pump systems of rapid pressure.

Background technique

Charge pump construction is widely used in the power-supply management system design of display screen or handheld device.Charge pump Referred to as switched capacitor voltage changer, be it is a kind of using capacitor rather than inductance or transformer are come the DC converter of energy storage. Input voltage can be made to be raised and lowered by charge pump, it might even be possible to which, for generating negative voltage, the field-effect inside is brilliant Body pipe (Field Effect Transistor, FET) switch arrays control the transmission of charge on capacitor in some way, lead to Often with the charge and discharge of capacitor in clock signal control charge pump, so that input voltage is made to increase (or reduction) in some way, To reach required output voltage.The basic thought of charge pump is exactly to generate height by build-up effect of the capacitor to charge Pressure.When using biggish capacitor, since the pressure difference of capacitance terminal during generation burning voltage is gradually reduced, generates and stablize output The time of voltage can very slowly.

Summary of the invention

The present invention is proposed a kind of suitable for the fast of bulky capacitor to solve above-mentioned the shortcomings of the prior art place Fast boosted charge pumping system, to can solve the Voltage Establishment time longer problem for using bulky capacitor charge pump, to realize Rapid pressure function.

The present invention adopts the following technical scheme that in order to solve the technical problem

A kind of the characteristics of rapid pressure charge pump system suitable for bulky capacitor of the invention includes: control circuit, boosting electricity Lotus pump and feed circuit；

The control circuit generates high-level control signal CTL_H or low level after receiving external signal in current period Control signal CTL_L simultaneously passes to boosting charge pump；

If the charge pump receives high-level control signal CTL_H, the power supply in the boosting charge pump is to fly line Capacitor Cfly and storage capacitance Cstore charge；

If the charge pump receives low level control signal CTL_L, the fly line capacitor in the boosting charge pump Cfly and storage capacitance Cstore charges to output capacitance Cout and generates output voltage VO UT to feed circuit；

The feed circuit is compared after receiving the output voltage VO UT with set voltage value VREF:

If output voltage VO UT is higher than the voltage value VREF, feed circuit generates feedback signal FB_OFF and passes to Control circuit makes control circuit stop generating high-level control signal CTL_H or low level control signal CTL_ in next period L, so that boosting charge pump be made to stop working；

If output voltage VO UT is not higher than the voltage value VREF, feed circuit does not generate signal, the control module High-level control signal CTL_H or low level control signal are generated under the action of continuing in the external signal in next period CTL_L, so that the boosting charge pump works normally.

The characteristics of rapid pressure charge pump system of the present invention, lies also in, and the boosting charge pump is by fly line capacitor Cfly, storage capacitance Cstore, output capacitance Cout and n switch composition；

When the charge pump receives high-level control signal CTL_H, by the connection of switch so that the fly line is electric Hold Cfly and storage capacitance Cstore to be arranged in parallel between external power supply and ground line and form access；The output capacitance It is formed and is opened a way between the connection and the fly line capacitor Cfly that Cout passes through switch；

When the charge pump receives low level control signal CTL_L, by the connection of switch so that the fly line is electric Hold Cfly, storage capacitance Cstore and output capacitance Cout between external power supply and ground line and form access, and described deposit Storage is held Cstore and is connected between fly line capacitor Cfly and output capacitance Cout, one end ground connection of the output capacitance Cout, The other end is connected with fly line capacitor Cfly.

Compared with prior art, the beneficial effects of the present invention are:

Charge pump of the invention uses rapid pressure structure, and storage electricity is added in the charge pump system using bulky capacitor Hold, overcomes the problem of existing bulky capacitor charging rate gradually slows down, the voltage difference provided in charging using storage capacitance, It improves charge pump and leads to the problem of that output voltage is slow-paced, reduce the settling time of output voltage.

Detailed description of the invention

Fig. 1 is the entire block diagram of rapid pressure charge pump system of the present invention；

Fig. 2 is a kind of implementing circuit figure of boosting charge pump of the present invention.

Specific embodiment

In the present embodiment, as shown in Figure 1, a kind of rapid pressure charge pump system suitable for bulky capacitor includes: control electricity Road, boosting charge pump and feed circuit；

Control circuit generates high-level control signal CTL_H or low level control after receiving external signal in current period Signal CTL_L simultaneously passes to boosting charge pump；

If charge pump receives high-level control signal CTL_H, the power supply in boosting charge pump is to fly line capacitor Cfly It charges with storage capacitance Cstore；

Fly line capacitor Cfly and storage if charge pump receives low level control signal CTL_L, in boosting charge pump Capacitor Cstore charges to output capacitance Cout and generates output voltage VO UT to feed circuit；

Feed circuit is compared after receiving output voltage VO UT with set voltage value VREF:

If output voltage VO UT is higher than voltage value VREF, feed circuit generates feedback signal FB_OFF and passes to control Circuit makes control circuit stop generating high-level control signal CTL_H or low level control signal CTL_L in next period, from And boosting charge pump is made to stop working；

If output voltage VO UT is not higher than voltage value VREF, feed circuit does not generate signal, and control module is in next week Phase continues to generate high-level control signal CTL_H or low level control signal CTL_L under the action of external signal, so that boosting Charge pump works normally.

Wherein, boosting charge pump is by fly line capacitor Cfly, storage capacitance Cstore, output capacitance Cout and n switch Composition；

When charge pump receives high-level control signal CTL_H, by the connection of switch so that fly line capacitor Cfly and Storage capacitance Cstore is arranged in parallel between external power supply and ground line and forms access；Output capacitance Cout passes through switch It is formed and is opened a way between connection and fly line capacitor Cfly；

When charge pump receives low level control signal CTL_L, by the connection of switch so that fly line capacitor Cfly, depositing Storage holds Cstore and output capacitance Cout between external power supply and ground line and forms access, and storage capacitance Cstore goes here and there It is associated between fly line capacitor Cfly and output capacitance Cout, one end ground connection of output capacitance Cout, the other end and fly line capacitor Cfly is connected.Specifically, as shown in Fig. 2, using 7 switches in the present embodiment；

Switch S1 connection fly line capacitor Cfly and power supply, and connect with switch S6 and switch S2；

Switch S2 connection storage capacitance Cstore and power supply, and connect with switch S1 and switch S3；

Switch S3 connection fly line capacitor Cfly and storage capacitance Cstore, and connected with switch S5；

Switch S4 connection storage capacitance Cstore and ground, and connect with switch S5 and switch S7；

Switch S5 connection fly line capacitor Cfly and ground, and connect with switch S3 and switch S4；

Switch S6 connection fly line capacitor Cfly and output capacitance Cout, and connect with switch S1；

Switch S7 connection storage capacitance Cstore and power supply, and connect with switch S4；

If rapid pressure charge pump receives high-level control signal CTL_H, switch S1, S2, S4, S5 are connected, switch S3, S6, S7 shutdown, make internal electric source charge fly line capacitor Cfly and storage capacitance Cstore；

If rapid pressure charge pump receives low level control signal CTL_L, switch S3, S6, S7 are connected, switch S1, S2, S4, S5 shutdown, make fly line capacitor Cfly and storage capacitance Cstore charge output capacitance Cout, generate output voltage VOUT。