CN2360874Y

CN2360874Y - Shunt voltage stabilizing power source

Info

Publication number: CN2360874Y
Application number: CN 98214172
Authority: CN
Inventors: 邓剑辉
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-05-16
Filing date: 1998-05-16
Publication date: 2000-01-26
Anticipated expiration: 2008-05-16

Abstract

The utility model discloses a shunt voltage stabilizing power source, which is composed of a current regulation circuit, a voltage stabilizing circuit and a current control circuit. Transistors T1 and T2 of the current regulation circuit are connected into a Darlington composite tube, a voltage regulator tube Z1 is connected between a base of the Darlington composite tube T2 and a collector electrode of a transistor T3 of the voltage stabilizing circuit, and a current control circuit is formed by the regulator tube Z1 and a constant current source HL which is connected between the collector electrode of the transistor T3 and the ground. An output current of the utility model can not be limited by the initial current value of a shunting device, a maximum output current can change along with the requirements of a load current, and the utility model has the advantages of fast response speed, small ripple and high efficiency.

Description

The parallel voltage-stabilizing power supply

The utility model relates to a kind of parallel voltage-stabilizing power supply.

Though existing parallel voltage-stabilizing power type is various, but their maximum output current all is subjected to the restriction of shunting device initial current value, because the initial current value of shunting device is all less at present, so maximum output current is less, and can not change with the electric current demand of load.

The purpose of this utility model provides the parallel voltage-stabilizing power supply that a kind of output current is not subjected to the initial current value restriction of shunting device.

For achieving the above object, technical solution of the present utility model is: be provided with the current control circuit that is made of constant current source HL and stabilivolt Z1 in existing parallel voltage-stabilizing power supply, constant current source HL is connected between transistor T 3 collectors and the ground, stabilivolt Z1 anode is connected on transistor T 3 collectors, its negative electrode is connected with transistor T 2 base stages, the electric current of Darlington complex pipe T2 base stage flows into constant current source HL through stabilivolt Z1, simultaneously the electric current of transistor T 3 collectors also flows into constant current source, the electric current of T2 base current and transistor T 3 collector currents and promptly be the constant current value of constant current source.When load current need increase or reduce, cause the output voltage of power supply to reduce or increase, make the electric current of transistor T 3 collectors reduce or increase, since the T2 base current that flows into constant current source and the electric current of T3 collector current be a steady state value, therefore the electric current of T2 base stage must increase or reduce, the output current of this power supply is increased or reduce, thereby keep the balance of electric current output total amount, keep constant voltage output.

Because the utility model is provided with the current control circuit that is made of constant current source HL and stabilivolt Z1, when changing, load current maximum output current is changed with load current by current control circuit, therefore it is compared with existing parallel voltage-stabilizing power supply, having output current not limited by the initial current value of shunting device, maximum output current can change with load current demand, the characteristics that response speed is fast, ripple is less, efficient is high.

Below in conjunction with the drawings and specific embodiments the utility model is further described:

Fig. 1---be electrical schematic diagram of the present utility model.

Fig. 2---be the circuit diagram of a kind of embodiment of the utility model.

Fig. 3---be the circuit diagram of the another kind of embodiment of the utility model.

As shown in Figure 1, the utility model provides the parallel voltage-stabilizing power supply to be made up of matrix current adjustment circuit, mu balanced circuit, mu balanced circuit comprises resistance R, stabilivolt W, transistor T 3, T4, matrix current adjustment circuit is made of the Darlington complex pipe that transistor T 1 is connected with T2, between transistor T 3 collectors of Darlington complex pipe T2 base stage and mu balanced circuit, be connected with stabilivolt Z1, it and the constant current source HL that is connected between transistor T 3 collectors and the ground constitute current control circuit, stabilivolt Z1 anode is connected on transistor T 3 collectors, and its negative electrode is connected with transistor T 2 base stages.Under no-load condition, transistor T 1 has electric current output I=I1 β _T1β _T2, the electric current that presets in the transistor T 4 is I2 β _T4The electric current I 1 of transistor T 2 base stages flows into constant current source HL through stabilivolt Z1, simultaneously the electric current I 2 of transistor T 3 collectors also flows into constant current source HL, the electric current of T2 base current I1 and transistor T 3 collector current I2 and promptly be the constant current value of constant current source HL, and this constant current value is constant.When load current need increase, cause the output voltage of power supply to reduce, make transistor T 4 collector currents reduce, the electric current I 2 that is transistor T 3 collectors reduces, because the constant current value of constant current source HL is constant, therefore the electric current I 1 of T2 base stage must increase, and makes the output current I=I1 β of this power supply _T1β _T2Also increase, thereby keep the balance that electric current is exported total amount, keep constant voltage output; In like manner, when load current need reduce, output current I also reduced thereupon.

Constant current source HL of the present utility model can adopt multiple mode to realize, the constant current source of parallel voltage-stabilizing power supply shown in Figure 2 is made of transistor T 5, T6, resistance R 2, R3, resistance R 2 is connected the collector of transistor T 5, the emitter of transistor T 6 is connected with resistance R 3, transistor T 5 base stages are connected with transistor T 6 emitters, transistor T 6 base stages are connected on transistor T 5 collectors, its collector is connected with transistor T 3 collectors, stabilivolt Z1 anode is connected on transistor T 6 collectors, and its negative electrode is connected with transistor T 2 base stages.Under no-load condition, the electric current of transistor T 1 is output as I=I1 β _T1β _T2, and the electric current that presets in the transistor T 4 is I2 β _T4The electric current I 1 of T2 base stage is through stabilivolt Z1 inflow transistor T6 collector, also inflow transistor T6 collector of the electric current I 2 of transistor T 3 collectors simultaneously, the output current of transistor T 6 be T2 base current I1 and transistor T 3 collector current I2 electric current with, this output current is a steady state value.When load current need increase, cause the output voltage of power supply to reduce, make transistor T 4 collector currents reduce, the electric current I 2 that is transistor T 3 collectors reduces, because transistor T 6 output currents are constant, then the electric current I 1 of T2 base stage must increase, and makes the output current I=I1 β of this power supply _T1β _T2Also increase thereupon, thereby keep the balance that electric current is exported total amount, keep constant voltage output; In like manner, when load current need reduce, output current I was also along with reducing.

The constant current source HL of the parallel voltage-stabilizing power supply that Fig. 3 provides is made of field effect transistor J1, its drain electrode is connected with ground with transistor T 3 collectors respectively with source electrode, with short circuit between grid and the source electrode, stabilivolt Z1 anode is connected on transistor T 3 collectors, negative electrode is connected with transistor T 2 base stages, the electric current I 1 of T2 base stage outputs to field effect transistor J1 drain electrode through stabilivolt Z1, the electric current I 2 of transistor T 3 collectors also is input to field effect transistor J1 drain electrode simultaneously, field effect transistor J1 output current be T2 base current I1 and transistor T 3 collector current I2 electric current and, this output current is a steady state value, and its principle of work and the described principle of work of Fig. 2 embodiment are roughly the same.

Because constant current source of the present utility model can adopt multiple mode to realize; it is in order to guarantee that constant current source has normal condition of work that stabilivolt Z1 is set; therefore this power supply not only is confined to above-mentioned two kinds of embodiment; everyly control the output current of power supply, its maximum output current is changed with the variation of load current all belong to protection domain of the present utility model by constant current source.

Claims

1, a kind of parallel voltage-stabilizing power supply that comprises matrix current adjustment circuit, mu balanced circuit, mu balanced circuit is made up of resistance R 1, stabilivolt W, transistor T 3, T4, the transistor T 1 and the T2 of matrix current adjustment circuit are connected into the Darlington complex pipe, it is characterized in that being provided with the current control circuit that constitutes by constant current source HL and stabilivolt Z1, constant current source HL is connected between transistor T 3 collectors and the ground, stabilivolt Z1 anode is connected on transistor T 3 collectors, and its negative electrode is connected with transistor T 2 base stages.

2, parallel voltage-stabilizing power supply according to claim 1, it is characterized in that constant current source HL is made of transistor T 5, T6, resistance R 2, R3, resistance R 2 is connected the collector of transistor T 5, the emitter of transistor T 6 is connected with resistance R 3, transistor T 5 base stages link to each other with transistor T 6 emitters, transistor T 6 base stages are connected on transistor T 5 collectors, its collector is connected with mu balanced circuit transistor T 3 collectors, stabilivolt Z1 anode is connected on transistor T 6 collectors, and its negative electrode is connected with transistor T 2 base stages.

3, parallel voltage-stabilizing power supply according to claim 1, it is characterized in that constant current source HL is made of field effect transistor J1, its drain electrode is connected with ground with transistor T 3 collectors respectively with source electrode, with short circuit between grid and the source electrode, stabilivolt Z1 anode is connected in the field effect transistor J1 drain electrode, and its negative electrode is connected with transistor T 2 base stages.