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Bus power supply circuit

A power supply circuit and bus technology, applied in the circuit field, can solve the problem of not being able to meet 9V and 32V at the same time, and achieve the effect of high precision and temperature characteristics

Active Publication Date: 2016-05-11
CRM ICBG (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that, figure 1 The structure in is only suitable for a narrower bus power supply voltage range, and cannot meet the requirements of 9V and 32V at the same time

Method used

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Experimental program
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Embodiment 1

[0025] Embodiment one: this embodiment combines the attached image 3 , attached Figure 5 And attached Figure 6 To illustrate, the current limiting source circuit 8 in this embodiment consists of a third resistor (R3), a fourth resistor (R4), a voltage regulator tube (ZD), a first NMOS tube (N1), a second NMOS tube (N2) , a third NMOS transistor (N3), a first PMOS transistor (P1), a second PMOS transistor (P2), a third PMOS transistor (P3), and a bias VB generating circuit 9. attached Figure 5 Shown is a schematic diagram of a specific implementation of the Vcc generating circuit 2. The circuit can ensure the stability of the Vcc power supply through the bandgap reference circuit 10 and the operational amplifier, and its specific value can be adjusted through the resistors R1 and R2.

[0026] as attached Figure 6 As shown, the bias VB generating circuit 9 is composed of an operational amplifier (AMP), a fifth resistor (R5), a fourth NMOS transistor (N4), a fifth NMOS t...

Embodiment 2

[0028] Embodiment two: this embodiment combines the attached Figure 4 And attached Figure 5 To illustrate, the current limiting source circuit 8 in this embodiment consists of a third resistor (R3), a fourth resistor (R4), a sixth resistor (R6), a voltage regulator tube (ZD), a first NMOS tube (N1), The second NMOS transistor (N2), the first PMOS transistor (P1), the second PMOS transistor (P2), and the third PMOS transistor (P3).

[0029] Working principle: The current value of I2 in this embodiment can be adjusted freely through R6. The difference between this embodiment and Embodiment 1 is that R6 is used to replace N3 and the bias VB generating circuit. The same working principle as Embodiment 1 is here I won't go into details. The circuit composition structure of this embodiment is simpler than that of the first embodiment, but the accuracy and temperature coefficient of the Ilimit2 value are worse.

[0030] In the present invention, the Ilimit1 and Ilimit2 of the sl...

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Abstract

The invention relates to a circuit, particularly to a bus power supply circuit. The bus power supply circuit comprises a positive wire of a bus, a negative wire of the bus, a high-voltage power supply generating circuit, a Vcc generating circuit, an other needed power supply generating circuit, a CPU, a functional circuit, a receiving circuit and a sending circuit, wherein one end of the Vcc generating circuit is connected with the negative end of a diode, and the other end of the Vcc generating circuit is connected with the negative wire; one end of an energy-storage capacitor is connected with the negative end of the diode, and the other end of the energy-storage capacitor is grounded; the Vcc generating circuit is also connected in parallel with a second capacitor; the other needed power supply generating circuit, the CPU, the functional circuit, the receiving circuit and the sending circuit are all connected with the Vcc generating circuit; the CPU is also connected with the other needed power supply generating circuit, the functional circuit, the receiving circuit and the sending circuit; the receiving circuit and the sending circuit are also connected with the positive wire. According to the bus power supply circuit, electric current limit value can be reasonably set in the whole power supply voltage range, so that the flexibility of voltage modulation can be improved.

Description

technical field [0001] The invention relates to a circuit, in particular to a bus power supply circuit. Background technique [0002] In the bus power supply technology, the master and a certain number of slaves are connected through two cables, and all the slaves are connected in parallel to the bus, and obtain power through the bus. At the same time, the bus is also used as a signal for the communication between the master and the slaves. Wire. When the master sends data to the slave, it adopts the bus voltage modulation method, that is, changes the bus voltage value to transmit data; and when the slave sends data to the master, it uses the bus current modulation method, that is, the slave passes through the slave bus. An additional amount of current is drawn to transfer data. Powered by the bus, all slave devices do not need to be equipped with batteries, and do not need to be connected to a separate power supply. The installation and maintenance costs are low, and envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/26
CPCG05F3/265
Inventor 曾洁琼张天舜王磊邱旻韡周宇捷
Owner CRM ICBG (WUXI) CO LTD