Charge pump output voltage temperature compensation circuit

A technology of temperature compensation circuit and output voltage, applied in the direction of conversion equipment without intermediate conversion to AC, can solve problems such as affecting the output voltage of the charge pump

Inactive Publication Date: 2013-06-05
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

As a reference voltage, Vref has a great influence on the stability of the output voltage of the charge pump. In theoretical analysis, Vref is considered as a constant voltage. However, according to the test data of existing products, Vref has a positive temperature coefficient, that is, the voltage increases with temperature. have the same trend, and this deviation will inevitably affect the output voltage of the charge pump

Method used

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  • Charge pump output voltage temperature compensation circuit

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Embodiment Construction

[0013] According to the existing non-volatile memory test data, from -40°C to 100°C, the charge pump output voltage changes by 0.26V, that is, there is a positive temperature coefficient of 1.86mV / °C. From the charge pump output voltage formula, the positive temperature coefficient is proportional to the temperature coefficient of the reference voltage Vref. The invention utilizes the negative temperature coefficient characteristic of the PN junction of the diode to effectively perform temperature compensation on the output voltage of the charge pump.

[0014] Such as figure 2 As shown, the diode DN0 for temperature compensation is added on the basis of basic feedback control. In order to ensure that the output voltage of the charge pump is consistent with the original value, the resistance of R0 needs to be adjusted to R0'. The temperature coefficient TC of the diode DN0 = -1.96mV / °C. The charge pump output voltage formula is modified as: Vpump=(R1+R0')*Vref / R1+Vbe, where Vbe ...

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Abstract

The invention discloses a charge pump output voltage temperature compensation circuit. The charge pump output voltage temperature compensation circuit comprises a charge pump, Vpump stands for charge pump output voltage, the charge pump output voltage Vpump is connected to a divider resistor, a sample voltage V1 is acquired after the charge pump output voltage Vpump is voltage divided by the divider resistor, the sample voltage V1 is compared with a reference voltage Vref through an operational amplifier, and output of the operational amplifier adjusts input of the charge pump circuit. The charge pump output voltage temperature compensation circuit is characterized in that a temperature compensation diode is connected between an output end of the charge pump and the divider resistor. According to the charge pump output voltage temperature compensation circuit, a negative temperature coefficient characteristic of a PN junction of the diode is used, and thus temperature compensation is effectively conducted to the output voltage of the charge pump.

Description

Technical field [0001] The invention relates to temperature compensation of the output voltage of a charge pump. Background technique [0002] At present, in general charge pump circuits such as figure 1 The feedback control circuit shown stabilizes the output voltage. Among them, Vref is the bandgap reference voltage, Vpump is the output voltage of the charge pump, R0 and R1 are the resistor divider circuits, and pump stage is the charge pump up (down) voltage circuit at all levels. The charge pump output voltage Vpump is divided by resistors to obtain the sampling voltage V1. A high-precision operational amplifier compares V1 with the reference voltage Vref. The output of the operational amplifier adjusts the input of the charge pump circuit to achieve a stable charge pump output voltage. purpose. The output voltage formula of the charge pump is: [0003] Vpump=(R1+R0)*Vref / R1. Among them, Vpump is the charge pump output voltage, Vbe is the diode voltage drop, R1 and R0' are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/04H02M3/06H02M3/08
Inventor 郭璐金建明
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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