阅读说明：本技术 直流供电电路及植入式医疗设备 (Direct current power supply circuit and implantable medical equipment ) 是由 宗升 李青峰 于 2019-09-17 设计创作，主要内容包括：本发明提供一种直流供电电路及植入式医疗设备,所述直流供电电路包括分压电路,用于对输出电压V<Sub>out</Sub>进行分压；电压调节支路,用于连接外部电源,并根据所述外部电源的电压和所述分压电路调节所述输出电压V<Sub>out</Sub>；控制芯片,用于提供基准电压V<Sub>ref</Sub>,并根据电压调节支路调节后的输出电压V<Sub>out</Sub>和所述基准电压V<Sub>ref</Sub>进行电压闭环控制。(The invention provides a direct current power supply circuit and implantable medical equipment, wherein the direct current power supply circuit comprises a voltage division circuit used for outputting voltage V out Carrying out partial pressure; a voltage regulating branch circuit for connecting with an external power supply and regulating the output voltage V according to the voltage of the external power supply and the voltage dividing circuit out (ii) a A control chip for providing a reference voltage V ref And the regulated output voltage V of the branch circuit is regulated according to the voltage out And said reference voltage V ref And performing voltage closed-loop control.)

1. A dc power supply circuit, comprising:

a voltage divider circuit for outputting a voltage V fed back to the control chip_outCarrying out partial pressure;

a voltage regulating branch circuit for connecting with an external power supply and regulating the output voltage V according to the voltage of the external power supply and the voltage dividing circuit_out；

A control chip for providing a reference voltage V_refAnd the regulated output voltage V of the branch circuit is regulated according to the voltage_outAnd said reference voltage V_refAnd performing voltage closed-loop control.

2. The circuit of claim 1, wherein the voltage regulation branch comprises an external power connection terminal and a resistor connected in series therewith.

3. The circuit of claim 2, wherein the output voltage V_outAnd the reference voltage V_refIn a relationship of

Wherein R is₁Is a voltage dividing resistor R in the voltage dividing circuit₃Is a resistor, V, connected in series with the external power supply connection terminal in the voltage regulation branch_cIs the voltage of the external power supply.

4. The circuit of claim 2, wherein the output voltage V_outAnd the reference voltage V_refIn a relationship of

Wherein R is₁And R₂Two resistors R connected in series in the voltage division circuit₃Is a resistor, V, connected in series with the external power supply connection terminal in the voltage regulation branch_cIs the voltage of the external power supply.

5. The circuit of claim 1, wherein the voltage regulation branch is configured to connect to a plurality of external power sources.

6. The circuit of claim 1, wherein the voltage regulating branch is configured to connect to at least one external power source selected from an independent power source, an output of the digital-to-analog converter, an IO output of the single-chip microcomputer, an output of the operational amplifier, and a PWM output of the single-chip microcomputer.

7. The circuit of claim 1, wherein the voltage regulation branch further comprises a filter element for processing the voltage output by the external power source.

8. The circuit of claim 1, wherein the DC power supply circuit is a DC/DC switch type circuit or a linear LDO circuit.

9. An implantable medical device, characterized in that it comprises an in-vivo device and an ex-vivo programmable device, wherein the in-vivo device and/or the ex-vivo programmable device is provided with a direct current supply circuit according to any one of claims 1-8.

10. The implantable medical device of claim 9, wherein the in-vivo device and/or the in-vitro programmable device is provided with at least one of an independent power supply, a digital-to-analog converter, an operational amplifier and a single-chip microcomputer as the external power supply.

Technical Field

The invention relates to the field of power supply circuits, in particular to a direct-current power supply circuit and implantable medical equipment.

Background

The control chip integrated in the direct current power supply circuit can integrate functions of pulse generation, closed-loop regulation, overvoltage and overcurrent protection and the like, and reduces circuit complexity and research and development period. Wherein the control chip can generate a voltage reference V_refThe engineer needs to select a suitable proportion of resistors to output the voltage V according to the specific application_outVoltage division is carried out, and then a feedback pin (FB) of a control chip and a voltage V are connected_refAnd comparing, and forming a voltage closed-loop regulating mechanism through an amplifier in the chip. The connection relationship between the output and the control chip is shown in FIG. 1, in which V_outAnd V_refIn a relationship of

From the above relationship, the output voltage V of the DC power supply circuit_outCan only be higher than V_ref. Due to V_refIs a fixed value provided inside the chip, so that the dc power supply circuit is difficult to be used for applications with low output voltage.

Disclosure of Invention

In view of the above, the present invention provides a dc power supply circuit, including:

a voltage divider circuit for outputting a voltage V fed back to the control chip_outCarrying out partial pressure;

a voltage regulating branch circuit for connecting with an external power supply and regulating the output voltage V according to the voltage of the external power supply and the voltage dividing circuit_out；

A control chip for providing a reference voltage V_refAnd the regulated output voltage V of the branch circuit is regulated according to the voltage_outAnd said reference voltage V_refAnd performing voltage closed-loop control.

Optionally, the voltage regulating branch comprises an external power connection terminal and a resistor connected in series with the external power connection terminal.

Optionally, the output voltage V_outAnd the reference voltage V_refIn a relationship of

Wherein R is₁Is a voltage dividing resistor R in the voltage dividing circuit₃Is a resistor, V, connected in series with the external power supply connection terminal in the voltage regulation branch_cIs the voltage of the external power supply.

Optionally, the output voltage V_outAnd the reference voltage V_refIn a relationship of

Wherein R is₁And R₂Two resistors R connected in series in the voltage division circuit₃Is a resistor, V, connected in series with the external power supply connection terminal in the voltage regulation branch_cIs the voltage of the external power supply.

Optionally, the voltage regulating branch is used for connecting a plurality of external power supplies.

Optionally, the voltage regulation branch is used to connect at least one external power supply of an independent power supply, an output end of the digital-to-analog converter, an IO output end of the single chip, an output end of the operational amplifier, and a PWM output end of the single chip.

Optionally, the voltage regulation branch further includes a filter element for processing a voltage output by the external power supply.

Optionally, the DC power supply circuit is a DC/DC switch type circuit or a linear LDO circuit.

The invention also provides implantable medical equipment which comprises in-vivo equipment and in-vitro program control equipment, wherein the in-vivo equipment and/or the in-vitro program control equipment are/is provided with the direct-current power supply circuit.

Optionally, the in-vivo device and/or the in-vitro program control device is provided with at least one of an independent power supply, a digital-to-analog converter, an operational amplifier and a single chip as the external power supply.

According to the direct-current power supply circuit provided by the invention, the voltage regulating branch circuit is added to be connected with the external power supply on the basis that the voltage dividing circuit divides the output voltage, so that the output voltage of the circuit can be regulated by changing the voltage of the external power supply, the range of the output voltage is expanded under the condition of not changing the voltage reference of a chip, and the direct-current power supply circuit can be used for application with lower output voltage.

The resistors in the direct current power supply circuit provided by the invention can all adopt fixed value resistors, the output voltage of the output circuit can be adjusted only by adjusting the voltage value of an external power supply, and a digital potentiometer and a singlechip are not required to be arranged to change the resistance value of the divider resistor, so that the digital potentiometer and a corresponding communication circuit between the digital potentiometer and the singlechip are omitted, and the cost and the volume of the output circuit are reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a block diagram of a dc power supply circuit according to an embodiment of the present invention;

fig. 2 is a circuit diagram of a dc power supply circuit according to an embodiment of the invention;

FIG. 3 is a circuit diagram of another DC power supply circuit in an embodiment of the present invention;

fig. 4 is a circuit diagram of a third dc power supply circuit according to an embodiment of the invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Embodiments of the present invention provide a DC power supply circuit, which may be a DC/DC switch-type circuit or a linear LDO (low dropout regulator) circuit. The circuit shown in fig. 1 comprises: voltage divider circuit 11, voltage regulation branch 12 and control chip 13.

Wherein the voltage dividing circuit 11 is used for outputting the voltage V fed back to the control chip_outPartial pressure is carried out. The voltage value before voltage division is the output voltage value of the power supply circuit to the electricity object, or is called the power supply voltage value.

The voltage regulating branch 12 is used for connecting an external power supply and is used for regulating the voltage V of the external power supply_cThe voltage-dividing circuit regulates the output voltage V_out。V_cThe circuit can be generated by any power supply, such as an independent power supply, an output end of a digital-to-analog converter, an IO output end of a single chip microcomputer, a PWM (pulse width modulation) output end of the single chip microcomputer, an output end of an operational amplifier (operational amplifier) and the like, and can achieve the purpose of adjusting output voltage by means of other power supplies in an application scene.

The control chip 13 is used for providing a reference voltage V_refAnd the regulated output voltage V of the branch circuit is regulated according to the voltage_outAnd a reference voltage V_refAnd performing voltage closed-loop control. The specific connection relation is that V_outAnd a feedback pin (FB) of the chip is connected, and the input voltage at the moment is a divided and regulated value and can be called as feedback voltage. The input voltage is regulated to constant V_refComparing, and forming a voltage closed-loop regulation mechanism by an amplifier in the chip, wherein V_refRelated to the model of the control chip. Voltage V of external power supply_cReference voltage V_refAn output voltage V_outThe values of the three are correlated with each other at a reference voltage V_refWithout change, by varying the voltage V of the external power supply_cI.e. the circuit can be allowed to output V of different sizes_out。

According to the direct-current power supply circuit provided by the embodiment of the invention, the voltage regulating branch is added to be connected with the external power supply on the basis that the voltage dividing circuit divides the output voltage, so that the output voltage of the circuit can be regulated by changing the voltage of the external power supply, the range of the output voltage is expanded under the condition of not changing the voltage reference of a chip, and the direct-current power supply circuit can be used for application with lower output voltage.

The voltage regulating branch 12 can be connected to a plurality of external power supplies V simultaneously_cThe value of (2) is related to the voltage value and the connection relation of each external power supply which is connected simultaneously, so that the adjusting mode is more flexible, and various output requirements are met.

Fig. 2 shows a preferred direct current supply circuit, in particular a DC/DC circuit, comprising a DC/DC control chip, which internally generates a voltage reference V_ref(ii) a The resistor R1 and the resistor R2 connected in series form an output voltage V fed back by the voltage dividing circuit_outCarrying out partial pressure; the power supply connection end and a resistor R3 connected in series with the power supply connection end form a voltage regulation branch circuit which is connected with a resistor R2 in parallel, and the voltage of an external power supply is V_c(one or more external power supply connection terminals are connected to each external power supply, respectively). V_outThe voltage is divided and regulated to be connected to the FB terminal of the DC/DC control chip and a voltage reference V_refThe comparison is performed and thus constitutes a voltage closed-loop regulation mechanism.

Based on the connection relationship shown in FIG. 2, the output voltage V_outAnd a reference voltage V_refIn a relationship of

Wherein R is₁And R₂Two resistors R connected in series in voltage-dividing circuit₃Is a resistor, V, in the voltage-regulating branch in series with the external power supply connection_cIs the voltage of the external power supply.

In the present embodiment, the output voltage V_outIs less than or equal to the reference voltage V_ref. When V is_cWhen becoming large, V_outAnd can be reduced to 0V, or even a negative voltage. Therefore, the embodiment of the invention can make the output voltage lower than the reference voltage V fixed in the chip_ref。

According to the preferred embodiment, all the resistors can adopt fixed value resistors, the output voltage of the output circuit can be adjusted only by adjusting the voltage value of the external power supply, and the resistance value of the voltage division resistor does not need to be changed by arranging a digital potentiometer and a singlechip, so that the digital potentiometer and a corresponding communication circuit between the digital potentiometer and the singlechip can be omitted, and the cost and the volume of the output circuit are reduced.

Fig. 3 shows another preferred direct current supply circuit, which comprises a DC/DC control chip, which internally generates a voltage reference V_ref(ii) a Resistor R1 for feedback output voltage V_outCarrying out partial pressure; the power supply connection end and a resistor R3 connected in series with the power supply connection end form a voltage regulation branch circuit which is connected with a resistor R1, and the voltage of an external power supply is V_c(one or more external power supply connection terminals are connected to each external power supply, respectively). V_outThe voltage is divided and regulated to be connected to the FB terminal of the DC/DC control chip and a voltage reference V_refThe comparison is performed and thus constitutes a voltage closed-loop regulation mechanism.

Based on the connection relationship shown in FIG. 3, the output voltage V_outAnd a reference voltage V_refIn a relationship of

Wherein R is₁Is a voltage dividing resistor, R₃Is a resistor, V, in the voltage-regulating branch in series with the external power supply connection_cIs the voltage of the external power supply.

Fig. 4 shows another preferred direct current supply circuit, which comprises a DC/DC control chip, which internally generates a voltage reference V_ref(ii) a The resistors R1 and R2 form an output voltage V fed back by the voltage dividing circuit_outCarrying out partial pressure; PWM output voltage V with single chip microcomputer as external power supply_ccIn this embodiment, the voltage regulation branch is provided with a filter capacitor C_fFor filtering the external voltage. V_outThe voltage is divided and regulated to be connected to the FB terminal of the DC/DC control chip and a voltage reference V_refThe comparison is performed and thus constitutes a voltage closed-loop regulation mechanism.

The embodiment of the invention provides implantable medical equipment, which comprises in-vivo equipment and in-vitro program-controlled equipment, wherein the in-vivo equipment can be active implantation equipment such as a brain nerve stimulator, the in-vitro program-controlled equipment is used for controlling the in-vivo equipment to realize corresponding therapy, and the in-vivo equipment and the in-vitro program-controlled equipment can be respectively provided with a direct current power supply circuit as shown in figures 1 to 4.

At least one of an independent power supply, a digital-to-analog converter, an operational amplifier and a singlechip can be arranged in the in-vivo device and the in-vitro program control device and used as an external power supply of the direct current power supply circuit. The IO output end of the single chip microcomputer, the digital-to-analog converter and the operational amplifier output end are preferably used as external power supplies.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.