CN207339651U

CN207339651U - A kind of APD high voltage power supplies generating means

Info

Publication number: CN207339651U
Application number: CN201721038346.6U
Authority: CN
Inventors: 潘峰; 张悦; 刘芝文
Original assignee: Ningbo Lvyoung High-Tech Electrical Technology Co Ltd
Current assignee: Ningbo Lvyoung High-Tech Electrical Technology Co Ltd
Priority date: 2017-08-18
Filing date: 2017-08-18
Publication date: 2018-05-08
Anticipated expiration: 2027-08-18

Abstract

The utility model discloses a kind of APD high voltage power supplies generating means, including impulse hunting source, switching device, diode, the first capacitance, the second capacitance and voltage sampling circuit, the output terminal in impulse hunting source is connected by one end of the first capacitance and switching device, and the other end of the switching device is connected by diode with output terminal；One end of second capacitance is connected between the anode of diode and output terminal, the other end ground connection of the second capacitance；One end of voltage sampling circuit is connected between the anode of diode and output terminal, the closure of the other end controlling switch device of voltage sampling circuit.The circuit design cost of the utility model is low, interference is small, and output voltage can flexibly be set.

Description

A kind of APD high voltage power supplies generating means

Technical field

It the utility model is related to power generator field, more particularly to a kind of APD high voltage power supplies generating means.

Background technology

At present, slight photo-electric signal often carries out opto-electronic conversion, it is necessary to high pressure with APD, but its required electric current is smaller, if adopted With commercial height output module, there are the defects of volume is big, output power line is longer, and easily it is disturbed；If high-pressure section integrates It on APD magnification circuit plates, then can solve the above problems, and avoid disturbing, reducing volume, there is integrated high voltage to change core at present Piece, but output voltage is not high, usually below 40 volts, such as needs high pressure, it is necessary to be improved to primary circuit, and higher price.

Utility model content

For overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of APD high voltage power supplies to fill Put, the purpose of this utility model adopts the following technical scheme that realization：

A kind of APD high voltage power supplies generating means, including impulse hunting source, switching device, diode, the first capacitance, second Capacitance and voltage sampling circuit, the output terminal in the impulse hunting source are connected by one end of the first capacitance and the switching device Connect, the other end of the switching device is connected by the diode with output terminal；One end of second capacitance is connected to two poles Between the anode and output terminal of pipe, the other end ground connection of the second capacitance；One end of the voltage sampling circuit is connected on diode Between anode and output terminal, the closure of the other end controlling switch device of voltage sampling circuit.

Further, first capacitance is differential capacitance.

Further, the impulse hunting source is 555 square-wave generators.

Further, the switching device is switching transistor.

Further, the switching device is switched field effect pipe.

Further, the voltage sampling circuit includes comparator, first resistor and second resistance, the first resistor and The overall one end of the second resistance series connection is connected between the anode of diode and output terminal, first resistor and second resistance string The overall other end ground connection of connection；The reverse input end of the comparator is connected between first resistor and second resistance, comparator Normal phase input end access reference voltage, the output terminal of comparator is by exporting the closure of electric signal controlling switch device.

Compared with prior art, the beneficial effects of the utility model are：The utility model cost is low, interference is small, and exports Voltage can flexibly be set.

Brief description of the drawings

Fig. 1 is the circuit diagram of the utility model；

Fig. 2 is the waveform input signal figure in impulse hunting source；

Fig. 3 is the differential signal waveform figure of Fig. 2；

Fig. 4 is the circuit structure diagram of switching transistor.

In figure：10th, 555 square-wave generator；20th, switching device；30th, comparator.

Embodiment

In the following, with reference to attached drawing and embodiment, the utility model is described further, it is necessary to explanation is, On the premise of not colliding, it can be formed in any combination between various embodiments described below or between each technical characteristic new Embodiment.

A kind of APD high voltage power supplies generating means, as shown in Figure 1, including impulse hunting source, switching device 20, diode, One capacitance C1, the second capacitance C2 and voltage sampling circuit, impulse hunting source output terminal pass through the first capacitance C1 and switching device 20 One end connection, the other end of the switching device 20 is connected by diode with output terminal；The cathode and switching device of diode 20 connections, the anode of diode are connected with output terminal.An end of second capacitance C2 is connected between the anode of diode and output terminal, The other end ground connection of second capacitance C2；One end of voltage sampling circuit is connected between the anode of diode and output terminal, and voltage is adopted The closure of the other end controlling switch device 20 of sample circuit, the output terminal of circuit connect APD photodiodes and are provided for it Required voltage, the High voltage output part of circuit is directly connected to APD photodiodes, it is possible to prevente effectively from external interference.

Above-mentioned impulse hunting source selects 555 square-wave generators 10, and output signal is square wave as shown in Figure 2.555 square waves First capacitance C1, the first capacitance C1 of the output termination of generator 10 is differential capacitance, as shown in figure 3, by square-wave pulse signal differential For the tip pulse signal of alternate positive and negative.

Voltage sampling circuit includes comparator 30, first resistor R1 and second resistance R2, first resistor R1 and second resistance The overall one end of R2 series connection is connected between diode and output terminal, first resistor R1 and overall another of second resistance R2 series connection End ground connection；The reverse input end of comparator 30 is connected between first resistor R1 and second resistance R2, and the positive of comparator 30 is defeated Enter to terminate into reference voltage, 30 output terminal of comparator is by exporting the closure of Signal-controlled switch device 20.

Switching device 20 is switching transistor, as shown in figure 4, control terminal, that is, base stage of switching transistor passes through load resistance Rs₁The output terminal of sample circuit is connected, collector passes through load resistance Rs₂The first capacitance C1 is connected, emitter connection diode Cathode.The operation principle of switching transistor：When input voltage vin is low-voltage, since base stage does not have electric current, collector Also no current, causes the load for being connected to collector terminal also not have electric current, and equivalent to switching on, triode is work at this time Make in cut-off region.Similarly, when input voltage vin is high voltage, due to there is base current flowing, collector is made to flow through more Big amplification electric current, therefore load circuit is just switched on, and equivalent to the closure of switch, triode is to work in saturation at this time Area.

Switched field effect pipe further may be selected in switching device 20, and principle is similar with switching transistor, and passes through control The conducting and cut-off of metal-oxide-semiconductor field effect transistor are opened or closed to control, so as to form switching device 20.

Above-mentioned comparator 30 uses general comparator, positive output end input reference voltage V_REF, inverting input is output Voltage, anti-phase input are terminated between first resistor R1 and second resistance R2, can be by being arranged as required to first resistor R1 With the resistance value size of second resistance R2, according to the mode of partial pressure, reference voltage V is further set_REFSize；Then ratio is passed through Saturation voltage forward or backwards, the closure of controlling switch device 20 are exported compared with reference voltage and output voltage.When output voltage reaches During to reference voltage, comparator controlling switch disconnects, and stops charging to the second capacitance C2；When output voltage is less than default reference During voltage, comparator controlling switch closure, continues to charge until reaching reference voltage to the 2nd C2 of capacitance.It is former by above-mentioned work Reason, and then form the high voltage power supply generating means of the utility model.

The above embodiment is only the preferred embodiment of the utility model, it is impossible to is protected with this to limit the utility model Scope, the change of any unsubstantiality that those skilled in the art is done on the basis of the utility model and replacing belongs to In the utility model scope claimed.

Claims

A kind of 1. APD high voltage power supplies generating means, it is characterised in that：Including impulse hunting source, switching device, diode, first Capacitance, the second capacitance and voltage sampling circuit, the output terminal in the impulse hunting source pass through the first capacitance and the switching device One end connection, the other end of the switching device is connected by the diode with output terminal；One end of second capacitance connects It is connected between the anode of diode and output terminal, the other end ground connection of the second capacitance；One end of the voltage sampling circuit is connected on Between the anode and output terminal of diode, the closure of the other end controlling switch device of voltage sampling circuit.
2. APD high voltage power supplies generating means as claimed in claim 1, it is characterised in that：First capacitance is differential capacitance.
3. APD high voltage power supplies generating means as claimed in claim 1, it is characterised in that：The impulse hunting source is 555 square waves Generator.
4. APD high voltage power supplies generating means as claimed in claim 1, it is characterised in that：The switching device is three poles of switch Pipe.
5. APD high voltage power supplies generating means as claimed in claim 1, it is characterised in that：The switching device is imitated for switch yard Ying Guan.
6. the APD high voltage power supply generating means as described in claim 1-5 is any, it is characterised in that：The voltage sampling circuit Including comparator, first resistor and second resistance, one end of the first resistor and second resistance series connection entirety is connected to Between the anode and output terminal of diode, the other end ground connection of first resistor and second resistance series connection entirety；The comparator Reverse input end is connected between first resistor and second resistance, the normal phase input end access reference voltage of comparator, comparator Output terminal by exporting the closure of electric signal controlling switch device.